WO2026065507A1 - Method for wireless communication, and terminal device and network device - Google Patents

Abstract

Provided are a method for wireless communication, and a terminal device and a network device. The method for wireless communication comprises: when a first event is satisfied, a terminal device executing a preset behavior, wherein the first event is related to a cell reselection process, and the preset behavior comprises a behavior of the terminal device triggering cell reselection before a cell reselection condition is met.

Description

Methods, terminal devices, and network devices for wireless communication Technical Field

This application relates to the field of communication technology, and more specifically, to a method, terminal device, and network device for wireless communication.

Background Technology

In some communication systems (such as new radio (NR) systems), to ensure signal coverage for terminal devices during mobility, the terminal device can reselect to a neighboring cell after the neighboring cell meets the corresponding cell reselection conditions. However, during the process of evaluating whether a neighboring cell meets the cell reselection conditions, the terminal device may experience a brief loss of coverage.

Summary of the Invention

This application provides a method, terminal device, and network device for wireless communication. The various aspects covered in this application are described below.

In a first aspect, a method for wireless communication is provided, comprising: if a first event is satisfied, a terminal device performs a preset behavior, wherein the first event is related to a cell reselection process, and the preset behavior includes the terminal device triggering a cell reselection before the cell reselection condition is satisfied.

In a second aspect, a method for wireless communication is provided, comprising: a network device sending second configuration information to a terminal device, the second configuration information being related to a first event, the second configuration information including an eighth parameter, the eighth parameter being used to indicate the value of a first duration, the first duration being used to indicate the length of a time window for the terminal device to predict cell measurement results; wherein, the first event includes: the measurement result of a first cell at a second time after the first duration is predicted at a first time exactly meeting the cell reselection condition; or the measurement result of the first cell at a second time after the first duration is predicted at a first time exactly meeting the cell reselection condition and the measurement result of the serving cell of the terminal device at the second time is predicted at the first time not meeting the cell retention criterion; or the measurement result of the serving cell at a fourth time after the first duration is predicted at a first time critically meeting the cell retention criterion and the measurement result of the first cell at the fourth time is predicted at the first time not meeting the cell reselection condition; the first cell is a neighboring cell of the terminal device.

Thirdly, a terminal device is provided, including: an execution module, configured to execute a preset behavior if a first event is satisfied, wherein the first event is related to the cell reselection process, and the preset behavior includes the terminal device triggering cell reselection before the cell reselection condition is satisfied.

Fourthly, a network device is provided, comprising: a first transmitting module, configured to transmit second configuration information to a terminal device, the second configuration information being related to a first event, the second configuration information including an eighth parameter, the eighth parameter being used to indicate the value of a first duration, the first duration being used to indicate the length of a time window for the terminal device to predict cell measurement results; wherein, the first event includes: the measurement result of a first cell at a second time after the first duration is predicted at a first time exactly meeting the cell reselection condition; or the measurement result of a first cell at a second time after the first duration is predicted at a first time exactly meeting the cell reselection condition and the measurement result of the serving cell of the terminal device at the second time is predicted at the first time not meeting the cell retention criterion; or the measurement result of the serving cell at a fourth time after the first duration is predicted at a first time critically meeting the cell retention criterion and the measurement result of the first cell at the fourth time is predicted at the first time not meeting the cell reselection condition; the first cell is a neighboring cell of the terminal device.

Fifthly, a terminal device is provided, including a processor and a memory, the memory being used to store one or more computer programs, and the processor being used to invoke the computer programs in the memory to cause the terminal device to perform some or all of the steps in the method of the first aspect.

In a sixth aspect, a network device is provided, including a processor, a memory, and a communication interface, wherein the memory is used to store one or more computer programs, and the processor is used to invoke the computer programs in the memory to cause the network device to perform some or all of the steps in the method of the second aspect.

Seventhly, embodiments of this application provide a communication system including the aforementioned terminal device and/or network device. In another possible design, the system may further include other devices that interact with the terminal device or network device as described in the embodiments of this application.

Eighthly, embodiments of this application provide a computer-readable storage medium storing a computer program that causes a computer to perform some or all of the steps in the methods described above.

Ninthly, embodiments of this application provide a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program operable to cause a computer to perform some or all of the steps of the methods described in the foregoing aspects. In some implementations, the computer program product may be a software installation package.

In a tenth aspect, embodiments of this application provide a chip including a memory and a processor, the processor being able to access memory... Use and run computer programs to perform some or all of the steps described in the methods of the above aspects.

In this embodiment, if the first event is met, the terminal device can trigger cell reselection before the cell reselection condition is met. Compared with the scheme where the terminal device must trigger cell reselection after the cell reselection condition is met, this embodiment helps to avoid the terminal device losing coverage during the process of evaluating whether the cell reselection condition is met, thereby reducing the probability of missed paging calls and improving user experience.

Attached Figure Description

Figure 1 is a system architecture example diagram of a wireless communication system applicable to embodiments of this application.

Figure 2 is a flowchart illustrating a method for wireless communication provided in an embodiment of this application.

Figure 3 is an example of the relationship between different moments on the time axis.

Figure 4 is a schematic diagram of the structure of the terminal device provided in the embodiment of this application.

Figure 5 is a schematic diagram of the structure of the network device provided in an embodiment of this application.

Figure 6 is a schematic structural diagram of the communication device provided in an embodiment of this application.

Detailed Implementation

Communication system architecture

Figure 1 is a system architecture example diagram of a wireless communication system 100 to which embodiments of this application can be applied. The wireless communication system 100 may include a network device 110 and a terminal device 120. The network device 110 may be a device that communicates with the terminal device 120. The network device 110 may provide communication coverage for a specific geographical area and may communicate with the terminal device 120 located within that coverage area.

Figure 1 illustrates an exemplary network device and two terminal devices. Optionally, the wireless communication system 100 may include multiple network devices, and each network device may include other numbers of terminal devices within its coverage area. This application embodiment does not limit this.

Optionally, the wireless communication system 100 may also include other network entities such as a network controller and a mobility management entity, which is not limited in this embodiment.

It should be understood that the technical solutions of the embodiments of this application can be applied to various communication systems, such as: 5th generation (5G) systems or new radio (NR), long term evolution (LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD) systems, etc. The technical solutions provided in this application can also be applied to future communication systems, such as 6th generation mobile communication systems, satellite communication systems, and so on.

The terminal device in this application embodiment can also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station (MS), mobile terminal (MT), remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, or user device. The terminal device in this application embodiment can be a device that provides voice and/or data connectivity to a user, and can be used to connect people, objects, and machines, such as a handheld device with wireless connectivity, vehicle-mounted device, etc. The terminal devices in the embodiments of this application can be mobile phones, tablets, laptops, PDAs, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, self-driving, remote medical surgery, smart grids, transportation safety, smart cities, and smart homes, etc. Optionally, the UE can act as a base station. For example, the UE can act as a scheduling entity, providing sidelink signals between UEs in V2X or D2D, etc. For example, cellular phones and cars communicate with each other using sidelink signals. Cellular phones and smart home devices communicate without relaying communication signals through a base station.

In some embodiments, the network device in this application can be a device for communicating with a terminal device. This network device can also be referred to as an access network device or a radio access network device, such as a base station. In this application, the network device can refer to a radio access network (RAN) node (or device) that connects the terminal device to the wireless network. Base stations can broadly encompass various names like those listed below, or be interchangeable with them, such as: NodeB, evolved NodeB (eNB), next-generation NodeB (gNB), relay station, transmitting and receiving point (TRP), transmitting point (TP), master station (MeNB), secondary station (SeNB), multi-mode radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), centralized unit-control plane (CU-CP), centralized unit-user plane (CU-UP), positioning node, etc. A base station can be a macro base station, micro base station, relay node, donor node, or similar entity, or a combination thereof. A base station can also refer to a communication module, modem, or chip installed within the aforementioned equipment or apparatus. A base station can also be a mobile switching center, and can be used for device-to-device (D2D), vehicle-to-everything (V2X), and machine-to-machine (M2M) connections. Equipment that functions as a base station in machine-to-machine (M2M) communication, network-side equipment in 6G networks, and equipment that functions as a base station in future communication systems, etc. Base stations can support networks using the same or different access technologies. The embodiments of this application do not limit the specific technologies or equipment forms used in the network equipment.

Base stations can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, and one or more cells can move depending on the location of the mobile base station. In other examples, a helicopter or drone can be configured as a device to communicate with another base station.

In some deployments, the network device in this application embodiment may refer to a CU or a DU, or the network device may include both a CU and a DU. The gNB may also include an AAU.

Network devices and terminal devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; and they can also be deployed in the air on airplanes, balloons, and satellites. This application does not limit the scenario in which the network devices and terminal devices are located.

It should be understood that all or part of the functions of the communication device in this application can also be implemented by software functions running on hardware, or by virtualization functions instantiated on a platform (e.g., a cloud platform).

In some embodiments, the network devices mentioned in this application are core network devices (or, network elements in the core network). For example, a core network device may include one of the following: a location management function (LMF) network element, a network slice selection function (NSSF) network element, an authentication server function (AUSF) network element, a unified data management (UDM) network element, an access and mobility management function (AMF) network element, a session management function (SMF) network element, a policy control function (PCF) network element, a user plane function (UPF) network element, a sensing function (SF) network element, a network data analytics function (NWDAF) network element, and an AI function management entity.

In some embodiments, the network device mentioned in this application is an operations, administration, and maintenance (OAM) device.

To facilitate understanding, some related technical knowledge involved in the embodiments of this application is first introduced. The following related technologies are optional solutions and can be arbitrarily combined with the technical solutions of the embodiments of this application, all of which fall within the protection scope of the embodiments of this application. The embodiments of this application include at least some of the following contents.

To ensure user experience, such as to ensure that the terminal device can be paged, a terminal device in the Radio Resource Control (RRC) idle state or RRC inactive state can perform cell selection or cell reselection to camp on a cell or reselect from one cell to another. When performing cell selection and/or cell reselection, the terminal device needs to evaluate whether the cell meets the camping conditions or the cell reselection conditions. These conditions are described below.

S-criterion

During the cell selection process, the terminal device needs to evaluate the cell measurement results of the measured cells to determine whether the cell meets the camping conditions. The cell camping criterion is also known as the S criterion. When the signal measurement results of a cell meet the S criterion, it can be selected by the terminal device as the camping cell. The specific content of the S criterion can be found in the following formula (1).
S _rxlev ＞0 and S _qual ＞0 (1)

Among them, S _rxlev = Q _rxlevmeas - ( Q _rxlevmin + Q _{rxlevminoffset} ) - P _compensation - Q _offsettemp , S _qual = Q _qualmeas - ( Q _qualmin + Q _{qualminoffset} ) - Q _offsettemp .

S _rxlev represents the cell selectable reception value, in decibels (dB).

S _qual represents the cell selection quality value, in dB.

Q _offsettemp represents the temporary offset value in dB, which is used for cells where connection establishment has failed.

Q _rxlevmeas represents the reference signal receiving power (RSRP) value of the measured cell.

Q _qualmeas represents the reference signal receiving quality (RSRQ) value of the measured cell.

Q _rxlevmin represents the minimum RSRP (Received Strength Requirement) in a cell, measured in dB. In some embodiments, Q _rxlevmin can be obtained through broadcast messages (such as system information blocks (SIBs)). For example, Q _rxlevmin can be obtained from one or more of the following: SIB1, SIB2, and SIB4. As an example, if the terminal device supports the supplementary uplink (SUL) frequency in the cell, the q-RxLevMinSUL broadcast in the system message can be used as the Q _rxlevmin value. As another example, if the cell broadcasts the parameter Q _{rxlevminoffsetcellSUL} in SIB3 and/or SIB4, the corresponding Q _rxlevmin needs to be added to the cell-level offset value to obtain the minimum receive strength of the cell; otherwise, the Q _rxlevmin value is q-RxLevMin.

Q _qualmin represents the minimum RSRQ receive strength requirement in the cell, in dB.

_{Qrxlevminoffset} is the offset value. This offset value is used to offset the Qrxlevmin of the signal when using _Srxlev to evaluate cell quality, to prevent ping-pong, when terminal devices camped on a visited public land mobile network (VPLMN) periodically search for high-priority public land mobile networks ( _PLMN ).

Q _{qualminoffset} is the offset value. This offset value is used to adjust the Q _qualmin of the signal to prevent ping-pong when the terminal equipment camped on the VPLMN periodically searches for a high-priority PLMN and uses S _qual to evaluate cell quality.

The unit of P _compensation is dB. If the terminal device supports additionalPmax in NS-PmaxList in the system information, then P _compensation is max(P _EMAX1 - P _PowerClass , 0) - (min(P _EMAX2 , P _powerClass ) - min(P _EMAX1 , P _powerClass )); otherwise, P _compensation is max(P _EMAX1 - P _PowerClass , 0). Here, P _EMAX1 and P _EMAX2 represent the maximum uplink transmission power allowed by the terminal device in the cell, in dB. P _EMAX1 and P _EMAX2 are obtained from p-Max and NS-PmaxList in the broadcast message, respectively. _{P powerClass} represents the maximum uplink transmission power determined by the power class capability of the terminal device, in dB.

When selecting a cell, the terminal device measures the cell's Q _{_rxlevmeas} and Q _{_qualmeas} , and obtains other parameters in the S criterion formula using the cell's system information and its own capability level. It then calculates S _{_rxlev} and S_{_qual}, and compares these values to 0. If S _{_rxlev} > 0 and S _{_qual}> 0, the terminal device considers the cell to meet the cell measurement requirements for cell selection and can select it as the cell to camp on. If the cell's system information broadcasts that the cell is allowed to camp on, the terminal device can choose to camp on that cell.

Community re-election conditions

The cell reselection conditions vary depending on the scenario. The following sections describe the cell reselection conditions for different scenarios.

Scenario 1: The terminal device reselects a cell with a higher frequency priority (i.e., a cell with a higher frequency priority than the serving cell). The conditions that need to be met

In some embodiments, if the cell configures the parameter threshServingLowQ in the system broadcast information, the terminal device needs to meet at least conditions 1 and 2 to reselect to a cell with higher frequency priority.

Condition 1: S _qual > Thresh _x,highQ and the duration is not less than Treselection _RAT . Wherein, S _qual is the cell-level measurement result (measurement quantity is RSRQ) corresponding to the cell with higher frequency priority, Thresh _x,highQ is the measurement result judgment threshold configured by the network device, and Treselection _RAT is the evaluation duration threshold configured by the network device.

Condition 2: The terminal device has stayed in the current serving cell for more than 1 second.

In some embodiments, if the cell does not configure the parameter threshServingLowQ in the system broadcast information, the terminal device must meet at least conditions 3 and 4 to reselect to a cell with higher frequency priority.

Condition 3: S _rxlev > Thresh _x,highP and the duration is not less than Treselection _RAT . Wherein, S _rxlev is the cell-level measurement result (measurement quantity is RSRP) corresponding to the cell with higher frequency priority, Thresh _x,highP is the measurement result judgment threshold configured by the network device, and Treselection _RAT is the evaluation duration threshold configured by the network device.

Condition 4: The terminal device has stayed in the current serving cell for more than 1 second.

Scenario 2: The terminal device reselects to a cell with the same frequency priority (i.e., a cell with the same frequency priority as the serving cell, packet). Conditions that need to be met (including cells on the same frequency and cells on different frequencies with the same frequency priority).

The conditions that a terminal device must meet to reselect to a cell with the same frequency priority can also be called the R criterion. For details of the R criterion, please refer to formulas (2) and (3).
R _s = Q _{meas, s} + Q _hyst - Q _offsettemp (2)
R _n =Q _{meas, n} +Q _offset -Q _offsettemp (3)

R _{_s} represents the R value of the serving cell, in dB.

R _{_n} represents the R value of the neighboring cell, in dB.

Q _hyst represents the cell sorting hysteresis factor.

Q _meas represents the RSRP value of the serving cell or neighboring cells, in dBm. Here, Q _meas,s represents the RSRP value of the serving cell, and Q _meas,n represents the RSRP value of the neighboring cells.

For intra-frequency reselection, the parameter Q _offset equals the inter-cell Q _{offset, n} (if a valid inter-cell Q _{offset, n} exists in the system broadcast), otherwise it is 0 (if no inter-cell Q _{offset, n} exists in the system broadcast). For inter-frequency reselection, the parameter Q _offset equals the sum of the inter-frequency Q _{offsetfrequency} and the inter-cell Q _{offset, n} (if a valid inter-cell Q _{offset, n} exists in the system broadcast), otherwise it equals the inter-frequency Q _{offsetfrequency} (if no inter-cell Q _{offset, n} exists in the system broadcast).

Q _offsettemp is a temporary offset in dB, used for cells where connection establishment has failed.

The NR system supports multi-beam operation. In scenarios that support multi-beam operation, when a terminal device performs cell reselection, the network device can use the system information configuration parameter rangeToBestCell to determine the optimal cell.

In some embodiments, if the network device does not configure the parameter rangeToBestCell, the terminal device will reselect the cell with the highest R ranking. In some embodiments, if the network device configures the parameter rangeToBestCell, the terminal device will reselect the cell with the most beams whose R values fall within the range of [R _best - rangeToBestCell, R _best ] and whose beam measurement results are above a certain threshold (absThreshSS-Consolidation). Here, R _best is the R value corresponding to the cell with the highest R value among the cells evaluated by the R criterion. In some embodiments, if multiple cells meet this condition, the terminal device will reselect the cell with the highest R value among them.

The terminal device must meet at least conditions 5 to 7 during the process of sorting and selecting cells.

Condition 5: Based on the above method, the duration of the assessment that the new cell is better than the current serving cell is not less than Treselection _NR .

Condition 6: If the terminal device is in a non-normal mobile state, scaling of parameters Treselection _NR and Q _hyst needs to be considered.

Condition 7: The terminal device has stayed in the current serving cell for more than 1 second.

Scenario 3: The terminal device reselects to a cell with a lower frequency priority (i.e., a cell with a lower frequency priority relative to the serving cell). The conditions that need to be met

In some embodiments, if the cell configures the parameter threshServingLowQ in the system broadcast information, the terminal device needs to meet at least conditions 8 and 9 to reselect to a cell with a lower frequency priority.

Condition 8: The serving cell satisfies _{S_qual} < Thresh_serving _,LowQ , and the cell with lower frequency priority satisfies _{S_qual} > Thresh_X _,LowQ , and the duration of this condition is not less than Treselection _RAT . Wherein, _{S_qual} is the cell-level measurement result of the serving cell (measurement quantity is RSRQ) or the cell-level measurement result (measurement quantity is RSRQ) corresponding to the cell with lower frequency priority, Thresh_serving _,LowQ and Thresh_X _,LowQ are the measurement result judgment thresholds configured by the network device, and Treselection _RAT is the evaluation duration threshold configured by the network device.

Condition 9: The terminal device has stayed in the current serving cell for more than 1 second.

In some embodiments, if the cell does not configure the parameter threshServingLowQ in the system broadcast information, the terminal device must satisfy at least conditions 10 and 11 to reselect to a cell with a lower priority frequency.

Condition 10: The serving cell satisfies _{S_qual} < Thresh_serving _{, LowP} , and the cell with lower frequency priority satisfies _{S_qual} > Thresh_X _{, LowP} , and the duration of this condition is not less than Treselection _RAT . Wherein, _{S_qual} is the cell-level measurement result of the serving cell (measurement value is RSRP) or the cell-level measurement result (measurement value is RSRP) corresponding to the cell with lower frequency priority; Thresh_serving _{, LowP} and Thresh_X _{, LowP} are the measurement result judgment thresholds configured by the network device; and Treselection _RAT is the evaluation duration threshold configured by the network device.

Condition 11: The terminal device has stayed in the current serving cell for more than 1 second.

Parameter scaling based on terminal device movement speed

For terminal devices in the RRC idle or RRC inactive state, the cell reselection evaluation process also requires determining the terminal device's speed state. As one implementation, the terminal device's speed state can be categorized into three types: normal speed state, medium speed state, and high speed state. Different speed states are determined by the number of cell reselections performed by the terminal device within a given time period. In some embodiments, if the terminal device is in a medium or high speed state, the parameters Treselection _RAT and Q _hyst need to be scaled to adapt to the terminal device's speed state. Introducing a speed-state-based parameter scaling mechanism helps mitigate the differentiated impact of different speeds on the cell reselection process of the terminal device.

In some embodiments, a terminal device can reselect to a neighboring cell after the neighboring cell meets the corresponding cell reselection criteria. However, during the process of evaluating whether a neighboring cell meets the corresponding cell reselection criteria, the terminal device may experience a brief loss of coverage (at which point the cell measurement results of the serving cell do not meet the aforementioned cell retention criteria or S-criteria). For example, when the terminal device is in a medium-speed or high-speed state, since the speed state classification is based on preset parameters from human experience, it may not necessarily match the actual needs of the terminal device well. In this scenario, if the set speed judgment parameters are unreasonable, the terminal device may face the risk of a brief loss of coverage.

To address the aforementioned issues, the inventors discovered that the reason a terminal device temporarily loses coverage during the process of evaluating whether a neighboring cell meets the cell reselection criteria is that, during this evaluation, the cell measurement results of the terminal device's serving cell may no longer meet the cell retention criterion (i.e., the S criterion), leading to a loss of coverage. However, currently, cell reselection requires the neighboring cell to meet the corresponding reselection criteria before the terminal device can trigger the reselection to the target neighboring cell. This ignores the possibility that the serving cell's cell measurement results may not meet the cell retention criterion during the cell reselection condition evaluation, thus interrupting the reselection process. After the interruption, the terminal device can only re-search for cells that meet the cell retention criterion to retain. This re-searching process means the terminal device is unable to receive paging messages for an additional period, increasing the probability of missed calls and reducing user experience. Therefore, this application proposes that the terminal device can trigger cell reselection before the neighboring cell meets the corresponding cell reselection criteria, allowing the terminal device to reselect from the serving cell to the neighboring cell before losing coverage, thereby reducing the probability of missed calls and improving user experience.

The following section will first describe the method embodiments of this application.

Figure 2 is a flowchart illustrating a method for wireless communication provided in an embodiment of this application. The method shown in Figure 2 can be executed by a terminal device, such as the terminal device 120 shown in Figure 1. In some embodiments, the method shown in Figure 2 can be executed interactively by the terminal device and a network device. For example, if the configuration related to the terminal device triggering cell reselection before the cell reselection condition is met is configured by the network device, the method shown in Figure 2 can be executed interactively by the terminal device and the network device. Alternatively, if the network device needs to indicate to the terminal device whether to allow the terminal device to trigger cell reselection before the cell reselection condition is met, the method shown in Figure 2 can be executed interactively by the terminal device and the network device.

The method shown in Figure 2 includes step S210, which will be described below.

In step S210, if the first event is satisfied, the terminal device executes the preset behavior.

In some embodiments, the first event relates to the cell reselection process. Alternatively, the first event includes events that occur during the cell reselection process. For example, the first event may relate to one or more of the following: cell reselection conditions, and measurements of the serving cell during the cell reselection condition assessment process.

In some embodiments, the first event may include: at a first moment, the terminal device predicts that the measurement result of the first cell at a second moment after a first duration will just meet the cell reselection condition. In this implementation, the first event is equivalent to the terminal device predicting that the measurement result of the first cell after a first duration will just meet the cell reselection condition.

In some embodiments, the first event may include: at a first moment, the terminal device predicts that the measurement result of the first cell at a second moment after a first duration will just meet the cell reselection condition, and at the first moment, the terminal device predicts that the measurement result of the serving cell at the second moment will not meet the cell retention criterion. That is, the first event may include: the terminal device predicts that when the cell reselection condition is met, or predicts that before the cell reselection condition is met, the measurement result of the serving cell will not meet the cell retention criterion. In this implementation, the first event is equivalent to the terminal device simultaneously predicting that the measurement result of the first cell after a first duration will just meet the cell reselection condition and that the measurement result of the serving cell after a first duration will not meet the cell retention criterion.

In some embodiments, the first event may include: at a first moment, the terminal device predicts that the measurement result of the serving cell at a fourth moment after a first duration will critically meet the cell retention criterion, and at the first moment, the terminal device predicts that the measurement result of the first cell at the fourth moment will not meet the cell reselection condition. That is, the first event may include: the terminal device simultaneously predicting that when the measurement result of the serving cell does not meet the cell retention criterion, the measurement result of the first cell will not meet the cell reselection condition. In this implementation, the first event is equivalent to the terminal device simultaneously predicting that the measurement result of the serving cell after a first duration will critically meet the cell retention criterion and that the measurement result of the first cell after a first duration will not meet the cell reselection condition.

In this embodiment of the application, the first cell is a neighboring cell of the terminal device, or in other words, the first cell is a neighboring cell of the serving cell of the terminal device.

In some embodiments, the fact that the measurement result of the first cell at the second time exactly meets the cell reselection condition can also be understood as: before the second time (or between the first time and the second time), the measurement result of the first cell does not meet the cell reselection condition, but when the second time arrives, the measurement result of the first cell meets the cell reselection condition.

In this embodiment of the application, the fact that the measurement results of the serving cell critically meet the cell residency criterion can also be understood as the fact that the measurement results of the serving cell just do not meet the cell residency criterion. The fact that the measurement results of the serving cell just do not meet the cell residency criterion can be understood as the S _qual value corresponding to the cell-level RSRQ measurement result of the serving cell being exactly equal to 0, or the S _rxlev value corresponding to the cell-level RSRP measurement result of the serving cell being exactly equal to 0.

In some embodiments, the aforementioned cell residency criteria can be used by the terminal device to determine whether a corresponding cell is suitable for residency. For example, if a cell meets the cell residency criteria, the terminal device determines that the cell is suitable for residency. Conversely, if a cell does not meet the cell residency criteria, the terminal device determines that the cell is unsuitable for residency. During the cell reselection condition evaluation process (i.e., before the terminal device reselects to a neighboring cell), if the measurement result of the terminal device's serving cell does not meet the cell residency criteria, the terminal device is considered to have lost coverage. During the period of coverage loss, the terminal device cannot normally receive paging messages sent by network devices.

In some embodiments, the cell dwell criteria described above may include the S criterion. A description of the S criterion can be found above and will not be repeated here.

In some embodiments, when a terminal device predicts that the measurement results of the serving cell at a second time moment do not meet the cell camping criteria, the terminal device may determine that continuing to camp on the serving cell may pose a risk of losing coverage.

In some embodiments, the "measurement result of the first cell" mentioned in this application refers to the cell-level measurement result of the first cell. Similarly, the "measurement result of the serving cell" mentioned in this application refers to the cell-level measurement result of the serving cell. It should be noted that, unless specifically emphasized, the "measurement result of the first cell" and/or "measurement result of the serving cell" mentioned below refer to cell-level measurement results, and will not be repeated hereafter.

The embodiments of this application do not limit the first time point; the first time point can be any time point during the cell reselection evaluation process. That is, the terminal device can predict whether the measurement results of the first cell meet the cell reselection conditions and/or whether the measurement results of the serving cell meet the cell retention criteria at any time point during the cell reselection evaluation process. As an example, the first time point can be the current time, that is, the terminal device can predict whether the measurement results of the first cell meet the cell reselection conditions and/or whether the measurement results of the serving cell meet the cell retention criteria at the current time.

In some embodiments, the first duration can be used to indicate the length of the time window in which the terminal device predicts cell measurement results. For example, the first duration can be used to indicate the maximum length of the time window in which the terminal device predicts cell measurement results, that is, the maximum temporal prediction duration for the terminal device to perform cell measurement result prediction based on AI technology. In other words, the first duration can be used to indicate the maximum time the terminal device can predict cell-level measurement results.

In some embodiments, the first duration for different scenarios can be defined separately. For example, the first duration corresponding to the scenario where the frequency priority of the first cell is higher than that of the serving cell is different from that corresponding to the scenario where the frequency priority of the first cell is equal to that of the serving cell. The corresponding first duration can be defined separately, which is a more flexible implementation. In some embodiments, the first duration can be defined uniformly for different scenarios. For example, the first duration corresponding to the scenario where the frequency priority of the first cell is higher than that of the serving cell and the first duration corresponding to the scenario where the frequency priority of the first cell is equal to that of the serving cell can be defined by a single parameter (i.e., a single parameter is shared by different scenarios). This implementation can simplify the measurement and prediction behavior of the terminal device.

This application does not limit the method of indicating the first duration in its embodiments. As one implementation, the first duration can be indicated by the network device. As another implementation, the first duration can be predefined or preconfigured, such as by a protocol. The method of indicating the first duration will be described later and will not be detailed here.

In some embodiments, the second moment is determined based on the first moment and the first duration. For example, the second moment refers to the moment that is after the first moment and is separated from the first moment by the first duration. Taking the first duration as 1 second as an example, if the first moment is the 0th second, then the second moment is the 1st second; if the first moment is the 2nd second, then the second moment is the 3rd second.

In some embodiments, the second moment refers to the moment when the measurement results of the first cell just meet the cell reselection conditions. That is, the terminal device predicts that before the second moment, the measurement results of the first cell do not meet the cell reselection conditions, but at the second moment, the measurement results of the first cell begin to meet the cell reselection conditions.

In some embodiments, the statement that the measurement results of the first cell at the second time moment just meet the cell reselection conditions can be understood or replaced as: the measurement results of the first cell at the first time moment do not yet meet the cell reselection conditions.

In some embodiments, the meaning of the measurement result of the first cell at the second time step exactly meeting the cell reselection condition may differ under different scenarios. Alternatively, the meaning of the measurement result of the first cell at the first time step not meeting the cell reselection condition may differ under different scenarios. This will be explained below in conjunction with different scenarios.

Scenario 1: The frequency priority of the first cell is higher than that of the serving cell.

In some embodiments, if the frequency priority of the first cell is higher than that of the serving cell, the meaning of the cell reselection condition being met by the measurement result of the first cell at the second time can be: at the second time, the duration corresponding to the state where the measurement result of the first cell is greater than the first threshold is equal to the first duration threshold. That is, if the frequency priority of the first cell is higher than that of the serving cell, the meaning of the cell reselection condition being met by the measurement result of the first cell at the second time can be: at the second time, the measurement result of the first cell is greater than the first threshold, and the duration is equal to the first duration threshold. Alternatively, if the frequency priority of the first cell is higher than that of the serving cell, the meaning of the cell reselection condition being met by the measurement result of the first cell at the second time can be: before the second time, the measurement result of the first cell is less than the first threshold, or the measurement result of the first cell is greater than the first threshold but the duration is less than the first duration threshold; at the second time, the measurement result of the first cell is greater than the first threshold, and the duration is equal to the first duration threshold.

In some embodiments, if the frequency priority of the first cell is higher than that of the serving cell, and the serving cell broadcasts the threshServingLowQ parameter, then the measurement result of the first cell is the RSRQ measurement result, or in other words, the measurement quantity corresponding to the measurement result of the first cell is RSRQ.

In some embodiments, if the frequency priority of the first cell is higher than that of the serving cell, and the serving cell does not broadcast the threshServingLowQ parameter, then the measurement result of the first cell is the RSRP measurement result, or in other words, the measurement quantity corresponding to the measurement result of the first cell is RSRP.

It should be noted that in the embodiments of this application, the threshServingLowQ parameter can be replaced with other names. The embodiments of this application do not limit this, as long as the parameter has the same or similar meaning as the threshServingLowQ parameter in the related art.

In some embodiments, the first threshold is a measurement result judgment threshold. For example, the first threshold may be a measurement result judgment threshold configured by the network device. Taking the measurement result of the first cell as an RSRQ measurement result as an example, the first threshold may be the parameters Thresh _{x, highQ} configured by the network device. Taking the measurement result of the first cell as an RSRP measurement result as an example, the first threshold may be the parameters Thresh _{x, highP} configured by the network device.

In some embodiments, the first duration threshold is an evaluation duration threshold. For example, the first duration threshold may be an evaluation duration threshold configured by the network device. Exemplarily, the first duration threshold may be the Treselection _RAT parameter configured by the network device.

In some embodiments, if the frequency priority of the first cell is higher than that of the serving cell, the meaning of the first cell's measurement result not meeting the cell reselection condition at the first time can be that, at the first time, the first cell's measurement result is greater than a first threshold, but the duration corresponding to the state where the first cell's measurement result is greater than the first threshold up to the first time is less than a first duration threshold, or at the first time, the first cell's measurement result is less than or equal to the first threshold. In this case, if the terminal device predicts that the serving cell's measurement result at the second time does not meet the cell camping criterion, or if the terminal device predicts that the serving cell's measurement result at the fourth time is close to meeting the cell camping criterion, the terminal device can execute a preset behavior. The fourth time is the time when the terminal device predicts that the serving cell's measurement result is close to meeting the cell camping criterion. In some embodiments, the fourth time is later than the first time and equal to or earlier than the second time.

In some embodiments, the meaning of the terminal device predicting that the measurement result of the serving cell at the fourth time moment critically satisfies the cell camping criterion can be: before the fourth time moment, the measurement result of the serving cell satisfies the cell camping criterion; while after the fourth time moment, the measurement result of the serving cell does not satisfy the cell camping criterion. Taking scenario 1 as an example, the meaning of the terminal device predicting that the measurement result of the serving cell at the fourth time moment critically satisfies the cell camping criterion can be: the terminal device predicts that the S _qual value corresponding to the cell-level RSRQ measurement result of the serving cell at the fourth time moment is close to 0, or the terminal... The device predicts that the S _rxlev value corresponding to the cell-level RSRP measurement result of the serving cell at the fourth time point will be close to 0.

To facilitate understanding, the first event in Scenario 1 will be introduced below with examples.

Example 1: Assume the current time is the first time, and the cell-level RSRQ measurement result of the first cell at the first time is greater than the first threshold, but the duration t1 corresponding to the state where the cell-level RSRQ measurement result of the first cell at the first time is greater than the first threshold is less than the first duration threshold. Here, t1 is assumed to be 1s and the first duration is 2s.

Example 1, Scenario 1: The first duration threshold is 3 seconds. At this time, the terminal device can predict the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the farthest point in time. If the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the second time do not meet the cell camping criteria, the terminal device considers determining the reselection target cell in advance instead of waiting until the second time arrives. In some implementations, in order to determine the reselection target cell before the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell fail to meet the cell camping criteria, the terminal device can first determine the fourth time. After determining the fourth time, the terminal device can execute a preset behavior between the first time and the fourth time.

Example 1, Scenario 2: The first time threshold is 5 seconds. At this time, the terminal device cannot predict the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the second time, and therefore cannot determine whether the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the second time meet the cell camping criterion. Assuming that there is exactly a 2-second interval between the fourth time and the first time, then at the first time, the terminal device can predict the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the fourth time at the furthest possible time. If the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the fourth time are close to meeting the cell camping criterion, then the terminal device considers determining the reselection target cell in advance instead of waiting until the second time to determine the reselection target cell. In some implementations, in order to determine the reselection target cell before the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell do not meet the cell camping criterion, the terminal device can first determine the fourth time. After determining the fourth time, the terminal device can execute a preset behavior between the first time and the fourth time.

Example 2: Assume the current time is the first time, and the cell-level RSRP measurement result of the first cell at the first time is greater than the first threshold, but the duration t4 corresponding to the state where the cell-level RSRP measurement result of the first cell is greater than the first threshold up to the first time is less than the first duration threshold. Here, t4 is assumed to be 1s and the first duration is 2s.

Example 2, Scenario 1: The first duration threshold is 3 seconds. At this time, the terminal device can predict the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the farthest point in time. If the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the second time do not meet the cell camping criteria, the terminal device considers determining the reselection target cell in advance instead of waiting until the second time arrives. In some implementations, in order to determine the reselection target cell before the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell fail to meet the cell camping criteria, the terminal device can first determine the fourth time. After determining the fourth time, the terminal device can execute a preset behavior between the first time and the fourth time.

Example 2, Scenario 2: The first time threshold is 5 seconds. At this time, the terminal device cannot predict the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the second time, and therefore cannot determine whether the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the second time meet the cell camping criterion. Assuming that there is exactly a 2-second interval between the fourth time and the first time, then at the first time, the terminal device can predict the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the fourth time at the furthest possible time. If the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the fourth time are close to meeting the cell camping criterion, then the terminal device considers determining the reselection target cell in advance instead of waiting until the second time to determine the reselection target cell. In some implementations, in order to determine the reselection target cell before the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell do not meet the cell camping criterion, the terminal device can first determine the fourth time. After determining the fourth time, the terminal device can execute a preset behavior between the first time and the fourth time.

Scenario 2: The frequency priority of the first cell is equal to the frequency priority of the serving cell.

In some embodiments, if the frequency priority of the first cell is equal to the frequency priority of the serving cell, the meaning of the measurement result of the first cell at the second time exactly satisfying the cell reselection condition can be: at the second time, the terminal device determines that the first cell has the highest ranking according to the first criterion, and the duration of the state corresponding to the highest ranking of the first cell is equal to the first duration threshold. In other words, if the frequency priority of the first cell is equal to the frequency priority of the serving cell, the meaning of the measurement result of the first cell at the second time exactly satisfying the cell reselection condition can be: at the second time, the terminal device determines that the first cell has the highest ranking according to the first criterion, and the duration of the highest ranking state is equal to the first duration threshold. Alternatively, if the frequency priority of the first cell is equal to the frequency priority of the serving cell, the meaning of the measurement result of the first cell at the second time point exactly satisfying the cell reselection condition can be as follows: before the second time point, the terminal device determines that the first cell is not ranked highest according to the first criterion, or the terminal device determines that the first cell is ranked highest according to the first criterion, but the duration corresponding to the state of the first cell being ranked highest is less than the first duration threshold; when the second time point arrives, the terminal device determines that the first cell is ranked highest according to the first criterion, and the duration corresponding to the state of the first cell being ranked highest is equal to the first duration threshold.

In some embodiments, the first criterion described above can be used by the terminal device to sort and/or select cells during cell reselection. For example, the first criterion described above can be the R criterion. A related introduction to the R criterion can be found above and will not be repeated here.

In some embodiments, the first duration threshold is an evaluation duration threshold. For example, the first duration threshold could be an evaluation of network device configuration. Duration threshold. For example, the first duration threshold may be the Treselection _RAT parameter configured in the network device.

In some embodiments, if the frequency priority of the first cell is equal to the frequency priority of the serving cell, the meaning of the first cell's measurement result not meeting the cell reselection condition at the first time can be that, at the first time, the terminal device determines that the first cell has the highest ranking according to the first criterion, but the duration corresponding to this highest ranking state is less than the first duration threshold, or at the first time, the terminal device determines that the first cell's ranking is not the highest according to the first criterion. In this case, if the terminal device predicts that the serving cell's measurement result at the second time does not meet the cell camping criterion, or if the terminal device predicts that the serving cell's measurement result at the fourth time is close to meeting the cell camping criterion, the terminal device can perform a preset action. The fourth time is the time when the terminal device predicts that the serving cell's measurement result is close to meeting the cell camping criterion. In some embodiments, the fourth time is later than the first time and equal to or earlier than the second time.

In some embodiments, the meaning of the terminal device predicting that the measurement results of the serving cell at the fourth time moment critically meet the cell camping criterion can be: before the fourth time moment, the measurement results of the serving cell meet the cell camping criterion; while after the fourth time moment, the measurement results of the serving cell do not meet the cell camping criterion. Taking scenario 2 as an example, the meaning of the terminal device predicting that the measurement results of the serving cell at the fourth time moment critically meet the cell camping criterion can be: the S _qual value corresponding to the cell-level RSRQ measurement result of the serving cell at the fourth time moment predicted by the terminal device is close to 0, or the S _rxlev value corresponding to the cell-level RSRP measurement result of the serving cell at the fourth time moment predicted by the terminal device is close to 0.

To facilitate understanding, the first event in scenario 2 will be introduced below with examples.

Example 3: Assume the current time is the first time, and the terminal device determines that the first cell has the highest ranking according to the first criterion. However, the duration t7 corresponding to the state where the first cell has the highest ranking as of the first time is less than the first duration threshold. Here, t7 is assumed to be 1 second and the first duration is 2 seconds.

Example 3, Scenario 1: The first duration threshold is 3 seconds. At this time, the terminal device can predict the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the farthest point in time. If the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the second time do not meet the cell retention criteria, the terminal device considers determining the reselection target cell in advance instead of waiting until the second time arrives. In some implementations, in order to determine the reselection target cell before the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell fail to meet the cell retention criteria, the terminal device can first determine the fourth time. After determining the fourth time, the terminal device can execute a preset behavior between the first time and the fourth time.

Example 3, Scenario 2: The first duration threshold is 5 seconds. At this time, the terminal device cannot predict the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the second time, and therefore cannot determine whether the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the second time meet the cell retention criteria. Assuming that the fourth time is exactly 2 seconds away from the first time, then at the first time, the terminal device can predict the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the fourth time at the furthest possible time. If the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the fourth time are close to meeting the cell retention criteria, then the terminal device considers determining the reselection target cell in advance instead of waiting until the second time arrives. In some implementations, in order to determine the reselection target cell before the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell do not meet the cell retention criteria, the terminal device can first determine the fourth time. After determining the fourth time, the terminal device can execute a preset behavior between the first time and the fourth time.

Scenario 3: The frequency priority of the first cell is lower than that of the serving cell.

In some embodiments, if the frequency priority of the first cell is lower than that of the serving cell, the meaning of the measurement result of the first cell at the second time exactly satisfying the cell reselection condition can be: at the second time, the duration of the state corresponding to the state where the first condition is satisfied is equal to the first duration threshold. Alternatively, if the frequency priority of the first cell is lower than that of the serving cell, the meaning of the measurement result of the first cell at the second time exactly satisfying the cell reselection condition can be: before the second time, the duration of the state corresponding to the state where the first condition is not satisfied or is satisfied but the first condition is satisfied is less than the first duration threshold; at the second time, the duration of the state corresponding to the state where the first condition is satisfied is equal to the first duration threshold.

In some embodiments, the first condition is related to one or more of the following: the measurement result of the first cell, and the measurement result of the serving cell. For example, the first condition may include one or more of the following: the measurement result of the first cell is greater than a second threshold, and the measurement result of the serving cell is less than a third threshold. As an example, the first condition may include: the measurement result of the first cell is greater than the second threshold and the measurement result of the serving cell is less than the third threshold.

In some embodiments, if the frequency priority of the first cell is lower than that of the serving cell, and the serving cell broadcasts the threshServingLowQ parameter, then the measurement result of the first cell is the RSRQ measurement result, or in other words, the measurement quantity corresponding to the measurement result of the first cell is RSRQ.

In some embodiments, if the frequency priority of the first cell is lower than that of the serving cell, and the serving cell does not broadcast the threshServingLowQ parameter, then the measurement result of the first cell is the RSRP measurement result, or in other words, the measurement quantity corresponding to the measurement result of the first cell is RSRP.

In some embodiments, the second threshold and/or the third threshold are measurement result judgment thresholds. For example, the second threshold and/or the third threshold may be measurement result judgment thresholds configured by the network device. Taking the measurement result of the first cell as an RSRQ measurement result as an example, the second threshold may be the parameter Thresh _{x, lowQ} configured by the network device, and the third threshold may be the parameter Thresh _{serving, lowQ} configured by the network device. Taking the RSRP measurement result of the cell as an example, the second threshold can be the network device configuration parameter Thresh _{x, lowP} , and the third threshold can be the network device configuration parameter Thresh _{serving, lowP} .

In some embodiments, the first duration threshold is an evaluation duration threshold. For example, the first duration threshold may be an evaluation duration threshold configured by the network device. Exemplarily, the first duration threshold may be the Treselection _RAT parameter configured by the network device.

In some embodiments, if the frequency priority of the first cell is lower than that of the serving cell, the meaning of the first cell's measurement result not meeting the cell reselection condition at the first time can be that, at the first time, the first condition is met, and the duration corresponding to the state of meeting the first condition is less than a first duration threshold, or the first condition is not met at the first time. In this case, if the terminal device predicts that the serving cell's measurement result at the second time does not meet the cell camping criterion, or if the terminal device predicts that the serving cell's measurement result at the fourth time is close to meeting the cell camping criterion, the terminal device can execute a preset behavior. The fourth time is the time when the terminal device predicts that the serving cell's measurement result is close to meeting the cell camping criterion. In some embodiments, the fourth time is later than the first time and equal to or earlier than the second time.

In some embodiments, the meaning of the terminal device predicting that the measurement results of the serving cell at the fourth time moment critically meet the cell camping criterion can be: before the fourth time moment, the measurement results of the serving cell meet the cell camping criterion; while after the fourth time moment, the measurement results of the serving cell do not meet the cell camping criterion. Taking scenario 3 as an example, the meaning of the terminal device predicting that the measurement results of the serving cell at the fourth time moment critically meet the cell camping criterion can be: the S _qual value corresponding to the cell-level RSRQ measurement result of the serving cell at the fourth time moment predicted by the terminal device is close to 0, or the S _rxlev value corresponding to the cell-level RSRP measurement result of the serving cell at the fourth time moment predicted by the terminal device is close to 0.

To facilitate understanding, the first event in scenario 3 will be introduced below with examples.

Example 4: Suppose the current time is the first time, and the first condition is met at the first time, and the duration t10 corresponding to the state where the first condition is met is less than the first duration threshold. Here, t10 is assumed to be 1 second and the first duration is 2 seconds.

Example 4, Scenario 1: The first duration threshold is 3 seconds. At this time, the terminal device can predict the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the farthest point in time. If the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the second time do not meet the cell camping criteria, the terminal device considers determining the reselection target cell in advance instead of waiting until the second time arrives. In some implementations, in order to determine the reselection target cell before the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell fail to meet the cell camping criteria, the terminal device can first determine the fourth time. After determining the fourth time, the terminal device can execute a preset behavior between the first time and the fourth time.

Example 4, Scenario 2: The first duration threshold is 5 seconds. At this time, the terminal device cannot predict the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the second time, and therefore cannot determine whether the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the second time meet the cell retention criteria. Assuming that the fourth time is exactly 2 seconds away from the first time, then at the first time, the terminal device can predict the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the fourth time at the furthest possible time. If the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the fourth time are close to meeting the cell retention criteria, then the terminal device considers determining the reselection target cell in advance instead of waiting until the second time to determine the reselection target cell. In some implementations, in order to determine the reselection target cell before the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell do not meet the cell retention criteria, the terminal device can first determine the fourth time. After determining the fourth time, the terminal device can execute a preset behavior between the first time and the fourth time.

Example 5: Suppose the current time is the first time, and the first condition is met at the first time, and the duration t13 corresponding to the state where the first condition is met is less than the first duration threshold. Here, t13 is assumed to be 1 second, and the first duration is 2 seconds.

Example 5, Scenario 1: The first duration threshold is 3 seconds. At this time, the terminal device can predict the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the farthest point in time. If the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the second time do not meet the cell camping criteria, the terminal device considers determining the reselection target cell in advance instead of waiting until the second time arrives. In some implementations, in order to determine the reselection target cell before the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell do not meet the cell camping criteria, the terminal device can first determine the fourth time. After determining the fourth time, the terminal device can execute a preset behavior between the first time and the fourth time.

Example 5, Scenario 2: The first duration threshold is 5 seconds. At this time, the terminal device cannot predict the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the second time, and therefore cannot determine whether the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the second time meet the cell retention criteria. Assuming that the fourth time is exactly 2 seconds away from the first time, then at the first time, the terminal device can predict the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the fourth time at the furthest possible time. If the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell at the fourth time are close to meeting the cell retention criteria, then the terminal device considers determining the reselection target cell in advance instead of waiting until the second time arrives. In some implementations, in order to determine the reselection target cell before the cell-level RSRQ measurement results and cell-level RSRP measurement results of the serving cell do not meet the cell retention criteria, the terminal device can first determine the fourth time. After determining the fourth time, the terminal device can execute a preset behavior between the first time and the fourth time.

It should be noted that the embodiments of this application do not limit the speed state of the terminal device. For example, the speed state of the terminal device can be... It can include one or more of the following: normal speed state, medium speed state, and high speed state.

In some embodiments, different speed states are determined based on the number of cell reselections performed by the terminal device within a certain time period. For example, if the number of cell reselections performed by the terminal device within a certain time period is less than a first quantity threshold (e.g., NCR_M), the terminal device's speed state can be considered to be a normal speed state; if the number of cell reselections performed by the terminal device is greater than or equal to the first quantity threshold and less than a second quantity threshold (e.g., NCR_H), the terminal device's speed state can be considered to be a medium speed state; if the number of cell reselections performed by the terminal device is greater than or equal to the second quantity threshold, the terminal device's speed state can be considered to be a high speed state. As an example, if the number of cell reselections performed by the terminal device within 60 seconds is less than 4, the terminal device's speed state can be considered to be a normal speed state; if the number of cell reselections performed by the terminal device within 60 seconds is greater than or equal to 4 and less than 8, the terminal device's speed state can be considered to be a medium speed state; if the number of cell reselections performed by the terminal device within 60 seconds is greater than or equal to 8, the terminal device's speed state can be considered to be a high speed state.

In some embodiments, if the terminal device is in a medium-speed or high-speed state, the terminal device can scale the first duration threshold and the parameter Q _hyst in the R criterion. That is, even if the first duration threshold and the parameter Q _hyst are scaled due to speed, the solution provided in this application embodiment is still applicable.

It should be noted that the cell reselection conditions in the prior art described in this application are for NR communication systems. If the cell reselection conditions are modified in future communication systems, the idea of this application will still apply. That is, if the first event is met, the terminal device will trigger cell reselection behavior before the cell reselection conditions are met, thereby avoiding the terminal device from losing coverage because the measurement results of the serving cell do not meet the cell dwell criteria.

The first event has been introduced above; the following section will introduce the preset behaviors executed by the terminal device.

In some embodiments, the aforementioned preset behavior includes the terminal device triggering cell reselection before the cell reselection conditions are met. That is, the terminal device can trigger cell reselection (i.e., perform cell reselection) before the cell reselection conditions are met, thereby helping to avoid situations where the terminal device loses coverage during the cell reselection evaluation process. For example, embodiments of this application can effectively prevent situations where the terminal device loses coverage due to unreasonable settings of parameters related to cell reselection evaluation configured by the network device (such as a first duration threshold and/or speed scaling-related parameters). In other words, in embodiments of this application, during the cell reselection evaluation process, the terminal device can perform reselection to a target cell before the cell reselection conditions are met (for example, if the terminal device predicts that the measurement results of the serving cell do not meet the cell residency criteria before the cell reselection conditions are met, then the terminal device can perform reselection to a target cell before the cell reselection conditions are met). This mechanism can effectively prevent scenarios where the terminal device loses service cell coverage, reduce the probability of missed paging calls, and improve user experience.

In this embodiment, when the first event is met, the terminal device can perform the reselection to the first cell at any time between the first and fourth times. This embodiment does not limit the specific time at which the terminal device performs the reselection to the first cell; this will be described below with reference to Figure 3. Figure 3 shows the relationship between the various times on the timeline; the relationships between the various times mentioned below can be found in Figure 3.

It should be noted that in the following description of preset behaviors, relative to the serving cell, the terminal device still needs to prioritize evaluating the first cell with the higher frequency priority, then evaluate the first cell with the same frequency priority, and finally evaluate the first cell with the lower frequency priority.

In some embodiments, the aforementioned preset behavior may include: at a first moment, the terminal device determines a first cell as the target cell and reselects to the first cell. If the first event is at the first moment, and the terminal device predicts that the measurement result of the first cell at the second moment after the first duration just meets the cell reselection condition; or, at the first moment, the terminal device predicts that the measurement result of the first cell at the second moment after the first duration just meets the cell reselection condition, and at the first moment, the terminal device predicts that the measurement result of the serving cell of the terminal device at the second moment does not meet the cell retention criterion, then the first cell here refers to the earliest cell predicted by the terminal device to meet the corresponding cell reselection condition at the first moment. For cells with the same frequency priority, if the number of first cells that meet the first event at the first moment is more than one, the terminal device arbitrarily selects a first cell from the first cells that meet the first event as the target cell and reselects to that first cell, or the terminal device sorts the first cells that meet the first event according to the R criterion, and selects the first cell with the highest ranking at the first moment as the target cell and reselects to that first cell. If the first event is at the first moment, and the terminal device predicts that the measurement result of the serving cell at the fourth moment after the first duration will critically meet the cell retention criterion, and the terminal device predicts that the measurement result of the first cell at the fourth moment will not meet the cell reselection condition, for cells with the same frequency priority, the terminal device selects the first cell with the best measurement result from the first cells that meet the above first event as the target cell and reselects to that first cell, or the terminal device sorts the first cells that meet the above first event according to the R criterion, selects the first cell with the highest ranking at the first moment as the target cell and reselects to that first cell.

For more information on the first moment, please refer to the above text; it will not be elaborated here.

In some embodiments, the aforementioned preset behavior may include: upon reaching a third time, the terminal device determines the first cell as the target cell and reselects to the first cell. The third time is a future time of the first time, and the time interval between the third time and the first time is a second duration. If the first event is at the first time, the terminal device predicts that the measurement result of the first cell at the second time after the first duration just meets the cell reselection condition; or, at the first time, the terminal device predicts the measurement result of the first cell at the second time after the first duration. If the cell reselection condition is met and the terminal device predicts at the first time that the measurement result of the serving cell at the second time does not meet the cell retention criterion, then the first cell here refers to the earliest cell predicted by the terminal device at the first time that meets the corresponding cell reselection condition. For cells with the same frequency priority, if there are more than one first cell that meets the first event at the first time, the terminal device arbitrarily selects one first cell from the first cells that meet the first event at the first time as the target cell and reselects that first cell at the third time. Alternatively, the terminal device sorts the first cells that meet the first event according to the R criterion at the first time, selects the first cell with the highest ranking at the first time as the target cell, and reselects that first cell at the third time. If the first event is at the first moment, and the terminal device predicts that the measurement result of the serving cell at the fourth moment after the first duration will critically meet the cell retention criterion, and the terminal device predicts that the measurement result of the first cell at the fourth moment will not meet the cell reselection condition, for cells with the same frequency priority, the terminal device selects the first cell with the best measurement result from the first cells that meet the above first event as the target cell and reselects the first cell at the third moment, or the terminal device sorts the first cells that meet the above first event according to the R criterion, selects the first cell with the highest ranking at the first moment as the target cell and reselects the first cell at the third moment.

In some embodiments, the second duration can be defined separately for different scenarios. For example, the second duration for scenarios with the `threshServingLowQ` parameter configured and scenarios without the `threshServingLowQ` parameter configured can be defined separately using different parameters. In some embodiments, the second duration can be defined uniformly for different scenarios. For example, the second duration for scenarios with the `threshServingLowQ` parameter configured and scenarios without the `threshServingLowQ` parameter configured can be defined using a single parameter (i.e., a single parameter is shared by different scenarios). Other parameters mentioned below (such as the fourth threshold, fifth threshold, sixth threshold, seventh threshold, eighth threshold, and ninth threshold) are similar and will not be elaborated upon further.

The method for obtaining the second duration will be introduced below, and will not be detailed here.

It should be noted that the above-mentioned third time is obtained by shifting the first time backward by a second duration, with the first time as the reference point. However, the embodiments of this application are not limited to this. For example, the above-mentioned third time can be obtained by shifting the fourth time backward by a second duration, with the fourth time as the reference point.

In some embodiments, the aforementioned preset behavior may include: upon reaching a fourth time point, the terminal device determines the first cell as the target cell and reselects to the first cell. Wherein, the measurement result of the serving cell at the fourth time point critically satisfies the cell retention criterion. For a related description of the fourth time point, please refer to the above text, which will not be repeated here. If the first event is that at the first time point, the terminal device predicts that the measurement result of the first cell at the second time point after the first duration just satisfies the cell reselection condition; or, at the first time point, the terminal device predicts that the measurement result of the first cell at the second time point after the first duration just satisfies the cell reselection condition, and at the first time point, the terminal device predicts that the measurement result of the serving cell of the terminal device at the second time point does not satisfy the cell retention criterion, then the first cell here refers to the earliest cell predicted by the terminal device at the first time point that satisfies the corresponding cell reselection condition. For cells with the same frequency priority, if the number of first cells satisfying the first event at the first time is more than one, the terminal device arbitrarily selects one of the first cells satisfying the first event at the first time as the target cell and reselects that first cell at the fourth time. Alternatively, the terminal device sorts the first cells satisfying the first event according to the R criterion at the first time, selects the first cell with the highest ranking at the first time as the target cell, and reselects that first cell at the fourth time. If the first event is at the first time, and the terminal device predicts that the measurement result of the serving cell at the fourth time after the first duration will critically satisfy the cell camping criterion, and the terminal device predicts that the measurement result of the first cell at the fourth time will not satisfy the cell reselection condition at the first time, for cells with the same frequency priority, the terminal device selects the first cell with the best measurement result from the first cells satisfying the first event as the target cell and reselects that first cell at the fourth time. Alternatively, the terminal device sorts the first cells satisfying the first event according to the R criterion, selects the first cell with the highest ranking at the first time as the target cell, and reselects that first cell at the fourth time.

In some embodiments, the aforementioned preset behavior may include: upon reaching a fifth time point, the terminal device determines the first cell as the target cell and reselects to the first cell. This is because the measurement result of the first cell at the fifth time point is greater than a fourth threshold. In other words, the terminal device can determine the time to reselect to the first cell based on the measurement result (i.e., the absolute measurement result) of the first cell. The method for obtaining the fourth threshold will be described below and will not be detailed here. If the measurement result of the first cell at the first time point is greater than the fourth threshold, then the fifth time point is equal to the first time point, and the terminal device determines the first cell as the target cell and reselects to the first cell at the first time point; if the measurement result of the first cell at the first time point is less than the fourth threshold, then the fifth time point is a future time of the first time point. In this scenario, the terminal device needs to wait until the measurement result of the first cell is greater than the fourth threshold (i.e., the fifth time point) to determine the first cell as the target cell and reselect to the first cell at the fifth time point. For cells with the same frequency priority, if the number of cells whose measurement result of the first cell is greater than the fourth threshold at the fifth time point is greater than 1, then the terminal device selects the cell with the best measurement result, or selects the cell with the highest ranking according to the R criterion, or arbitrarily selects a cell as the target cell and reselects to the first cell at the fifth time point.

In some embodiments, the aforementioned preset behavior may include: upon reaching the sixth time point, the terminal device determines the first cell as the target cell and reselects to the first cell. Wherein, the second condition is met at the sixth time point.

In some embodiments, the second condition relates to one or more of the following: measurement results of the first cell, measurement results of the serving cell, and the ranking of the first cell.

In some embodiments, the second condition differs for different scenarios. The second conditions used in different scenarios are described below.

In some embodiments, if the frequency priority of the first cell is higher than that of the serving cell, the second condition may be that the measurement result of the first cell is greater than the first threshold.

In some embodiments, if the frequency priority of the first cell is equal to the frequency priority of the serving cell, the second condition may be that the first cell is ranked highest according to the first criterion.

In some embodiments, if the frequency priority of the first cell is lower than that of the serving cell, the second condition can be the first condition. That is, the second condition can be that the measurement result of the first cell is greater than the second threshold and the measurement result of the serving cell is less than the third threshold.

It can be seen that the second condition mentioned above is related to the cell reselection condition. That is, the terminal device can determine the time to reselect to the first cell based on the cell reselection condition. If the second condition is met at the first moment, then the sixth moment is equal to the first moment, and the terminal device determines the first cell that meets the second condition as the target cell and reselects to the first cell at the first moment. If the second condition is not met at the first moment, then the sixth moment is a future moment of the first moment. In this scenario, the terminal device needs to wait until the second condition is met (i.e., the sixth moment) to determine the first cell that meets the second condition as the target cell and reselect to that first cell. For cells with the same frequency priority, if the number of cells that meet the second condition at the sixth moment is greater than 1, the terminal device selects the cell with the best measurement result, or selects the cell with the highest ranking according to the R criterion, or arbitrarily selects a cell as the target cell and reselects to that first cell.

The methods for obtaining the various thresholds involved in the second condition will be introduced below, and will not be detailed here.

In some embodiments, the aforementioned preset behavior may include: upon reaching a seventh time, the terminal device determines the first cell as the target cell and reselects to the first cell. This is achieved when the measurement result of the serving cell at the seventh time is less than a fifth threshold. In other words, the terminal device can determine the time to reselect to the first cell based on the measurement result of the serving cell (i.e., the absolute measurement result). The method for obtaining the fifth threshold will be described below and will not be detailed here. If the measurement result of the serving cell at the first time is less than the fifth threshold, then the seventh time is equal to the first time, and the terminal device determines the first cell as the target cell and reselects to the first cell at the first time. If the measurement result of the serving cell at the first time is greater than or equal to the fifth threshold, then the seventh time is a future time of the first time. In this scenario, the terminal device needs to wait until the measurement result of the serving cell is less than the fifth threshold (i.e., the seventh time) to determine the first cell as the target cell and reselect to that first cell. For cells with the same frequency priority, if the number of first cells being evaluated at the seventh time is greater than 1, the terminal device selects the cell with the best measurement result, or selects the cell with the highest ranking according to the R criterion, or arbitrarily selects a cell as the target cell and reselects to that first cell.

In some embodiments, the aforementioned preset behavior may include: upon reaching an eighth time, the terminal device determines the first cell as the target cell and reselects to the first cell. This is because, at the eighth time, the measurement result of the first cell is greater than a sixth threshold and the measurement result of the serving cell is less than a seventh threshold. That is, the terminal device can determine the time to reselect to the first cell based on the measurement results of the first cell and the serving cell. If, at the first time, the measurement result of the first cell is greater than the sixth threshold and the measurement result of the serving cell is less than the seventh threshold, then the eighth time is equal to the first time, and at the first time, the terminal device determines the first cell satisfying the condition that the measurement result of the first cell is greater than the sixth threshold as the target cell and reselects to that first cell. If, at the first time, the measurement result of the first cell is less than or equal to the sixth threshold or the measurement result of the serving cell is greater than or equal to the seventh threshold, then the eighth time is a future time of the first time. In this scenario, the terminal device needs to wait until the time when the measurement result of the first cell is greater than the sixth threshold and the measurement result of the serving cell is less than the seventh threshold (i.e., the eighth time) to determine the first cell satisfying the condition that the measurement result of the first cell is greater than the sixth threshold as the target cell and reselects to that first cell. For cells with the same frequency priority, if the number of cells whose measurement result of the first cell is greater than the sixth threshold at the eighth time is greater than 1, the terminal device selects the cell with the best measurement result, or selects the cell with the highest ranking according to the R criterion, or arbitrarily selects a cell as the target cell and reselects to the first cell.

The methods for obtaining the sixth and/or seventh thresholds will be introduced below, and will not be detailed here.

In some embodiments, the aforementioned preset behavior may include: upon reaching the ninth time, the terminal device determines the first cell as the target cell and reselects to the first cell. Wherein, the third condition is met at the ninth time.

In some embodiments, the third condition may take into account the measurement results of the serving cell in addition to the second condition described above. That is, the terminal device may determine the time to reselect to the first cell based on the cell reselection conditions and the measurement results of the serving cell.

In some embodiments, the third condition relates to one or more of the following: measurement results of the first cell, measurement results of the serving cell, and the ranking of the first cell.

In some embodiments, the third condition varies depending on the scenario. The third condition used in different scenarios is described below.

In some embodiments, if the frequency priority of the first cell is higher than that of the serving cell, the third condition can be that the measurement result of the first cell is greater than a first threshold and the measurement result of the serving cell is less than an eighth threshold. If, at the first moment, the measurement result of the first cell is greater than the first threshold and the measurement result of the serving cell is less than the eighth threshold, then the ninth moment is equal to the first moment, and at the first moment, the terminal device determines the first cell whose measurement result is greater than the first threshold as the target cell and reselects to that first cell; if, at the first moment, the measurement result of the first cell is less than or equal to the first threshold or the measurement result of the serving cell is greater than or equal to the eighth threshold, then the ninth moment is a future moment of the first moment. In this scenario, the terminal device needs to wait until the moment when the measurement result of the first cell is greater than the first threshold and the measurement result of the serving cell is less than the eighth threshold (i.e., the ninth moment) to determine the first cell whose measurement result is greater than the first threshold as the target cell. The target cell is selected and reselected to the first cell. For cells with the same frequency priority, if the number of cells whose measurement results of the first cell are greater than the first threshold at the ninth time is greater than 1, the terminal device selects the cell with the best measurement result, or selects the cell with the highest ranking according to the R criterion, or arbitrarily selects a cell as the target cell and reselects to the first cell.

In some embodiments, if the frequency priority of the first cell is equal to the frequency priority of the serving cell, the third condition can be that the first cell is ranked highest according to the first criterion and the measurement result of the serving cell is less than the ninth threshold. If at the first moment, the first cell is ranked highest and the measurement result of the serving cell is less than the ninth threshold, then the ninth moment is equal to the first moment, and at the first moment, the terminal device determines the first cell with the highest R ranking as the target cell and reselects to that first cell; if at the first moment, the measurement result of the serving cell is greater than or equal to the ninth threshold, then the ninth moment is a future moment of the first moment, and in this scenario, the terminal device needs to wait until the measurement result of the serving cell is less than the ninth threshold (i.e., the ninth moment) to determine the first cell with the highest R ranking as the target cell and reselect to that first cell.

For details on how to obtain the various thresholds involved in the third condition, please refer to the following text, which will not be elaborated here.

In some embodiments, the aforementioned preset behavior may include: upon reaching the tenth time, the terminal device determines the first cell as the target cell and reselects to the first cell. Here, the tenth time is any time between the first time and the fourth time. That is, at any time between the first time and the fourth time, the terminal device can determine, based on implementation, when to determine the first cell as the target cell and reselect to the first cell. If the first event is at the first time, and the terminal device predicts that the measurement result of the first cell at the second time after the first duration just meets the cell reselection condition; or, at the first time, the terminal device predicts that the measurement result of the first cell at the second time after the first duration just meets the cell reselection condition, and at the first time, the terminal device predicts that the measurement result of the serving cell of the terminal device at the second time does not meet the cell retention criterion, then the first cell here refers to the earliest cell predicted by the terminal device at the first time that meets the corresponding cell reselection condition. For cells with the same frequency priority, if the number of first cells satisfying the first event at the first time is more than one, the terminal device arbitrarily selects a first cell from the first cells satisfying the first event as the target cell and reselects that first cell at the tenth time. Alternatively, the terminal device sorts the first cells satisfying the first event according to the R criterion, selects the first cell with the highest ranking at the first time as the target cell, and reselects that first cell at the tenth time. If the first event is at the first time, and the terminal device predicts that the measurement result of the serving cell at the fourth time after the first duration will critically satisfy the cell camping criterion, and the terminal device predicts that the measurement result of the first cell at the fourth time will not satisfy the cell reselection condition at the first time, for cells with the same frequency priority, the terminal device selects the first cell with the best measurement result from the first cells satisfying the first event at the first time as the target cell and reselects that first cell at the tenth time. Alternatively, the terminal device sorts the first cells satisfying the first event according to the R criterion, selects the first cell with the highest ranking at the first time as the target cell, and reselects that first cell at the tenth time.

It should be noted that the embodiments of this application do not limit the order of the third, fifth, sixth, seventh, eighth, ninth, and tenth moments mentioned above, as long as they are located between the first and fourth moments. For example, the third moment may be before the fifth moment, after the fifth moment, or the same moment as the fifth moment. Similarly, the third moment may be before the sixth moment, after the sixth moment, or the same moment as the sixth moment. Other cases are similar and will not be elaborated further here.

In some embodiments, the terminal device needs to satisfy a fourth condition before triggering cell reselection before the cell reselection conditions are met. The fourth condition is related to the duration of the terminal device's stay in the serving cell.

In some embodiments, the fourth condition may include: the terminal device's dwell time in the serving cell exceeds a third duration. The third duration indicates the minimum dwell time the terminal device needs to spend in the serving cell. This application embodiment does not limit the value of the third duration; for example, the third duration can be 1 second, 3 seconds, etc. This application embodiment does not limit the method of obtaining the third duration; for example, the third duration can be predefined or preconfigured, or it can be configured by the network device.

The above text mentioned various parameters (such as the second duration and the fourth threshold). The following text will introduce how to obtain these parameters.

As one implementation method, the various parameters mentioned above can be configured by the network device.

Referring again to Figure 2, in some embodiments, the method shown in Figure 2 may further include steps S212 and/or S214. As an example, the method shown in Figure 2 may also include step S214. As another example, the method shown in Figure 2 may also include step S212. As yet another example, the method shown in Figure 2 may also include steps S212 and S214.

In step S212, the terminal device receives the first configuration information sent by the network device, and correspondingly, the network device sends the first configuration information to the terminal device.

In some embodiments, the first configuration information relates to the behavior of the terminal device in triggering cell reselection before the cell reselection conditions are met.

In some embodiments, the first configuration information may include a first parameter. The first parameter may be used to indicate the value of the second duration.

In some embodiments, the first configuration information may include a second parameter. The second parameter may be used to indicate the value of the fourth threshold.

In some embodiments, the first configuration information may include a third parameter. The third parameter may be used to indicate the value of the fifth threshold.

In some embodiments, the first configuration information may include a fourth parameter and a fifth parameter. The fourth parameter may be used to indicate the value of a sixth threshold. The fifth parameter may be used to indicate the value of a seventh threshold.

In some embodiments, the first configuration information may include a sixth parameter. The sixth parameter may be used to indicate the value of an eighth threshold.

In some embodiments, the first configuration information may include a seventh parameter. The seventh parameter may be used to indicate the value of a ninth threshold.

In step S214, the terminal device receives the second configuration information sent by the network device, and correspondingly, the network device sends the second configuration information to the terminal device.

In some embodiments, the second configuration information is related to the first event or the second configuration information is related to the behavior of the terminal device triggering cell reselection before the cell reselection conditions are met.

In some embodiments, the second configuration information may include an eighth parameter. The eighth parameter may be used to indicate the value of the first duration.

As an example, a network device can send a second configuration information to an end device to configure an eighth parameter.

As another example, the network device can send second configuration information and first configuration information to the terminal device to configure the eighth parameter and the first parameter. It should be noted that if the second duration is defined using multiple parameters (e.g., the second duration is defined separately for scenarios with and without the `threshServingLowQ` parameter configured), then the network device can configure these multiple parameters separately to the terminal device. The other parameters are similar, and will not be described in detail in this embodiment.

As yet another example, a network device can send a second configuration information and a first configuration information to a terminal device to configure an eighth parameter and a second parameter.

As yet another example, a network device can send second configuration information and first configuration information to a terminal device to configure the eighth parameter and the third parameter.

As yet another example, a network device can send second configuration information and first configuration information to a terminal device to configure the eighth parameter, the fourth parameter, and the fifth parameter.

As yet another example, a network device can send second configuration information and first configuration information to a terminal device to configure the eighth parameter and the sixth parameter.

As yet another example, a network device can send second configuration information and first configuration information to a terminal device to configure the eighth parameter and the seventh parameter.

As another example, the network device can send second configuration information and first configuration information to the terminal device to configure the eighth, sixth, and seventh parameters. It should be noted that the sixth and seventh parameters can be the same or different. If the sixth and seventh parameters are the same, then, as yet another example, the network device can send the second configuration information and first configuration information to the terminal device to configure the eighth and sixth parameters.

In some embodiments, the first configuration information and the second configuration information may be different configuration information, or in other words, the first configuration information and the second configuration information may be carried in different messages (e.g., carried in different system broadcast messages). In some embodiments, the first configuration information and the second configuration information may be the same configuration information, or in other words, the first configuration information and the second configuration information may be carried in the same message (e.g., carried in the same type of system broadcast message). In this case, through the same step, the terminal device receives the second configuration information sent by the network device or receives the first configuration information and the second configuration information sent by the network device. Correspondingly, the network device sends the second configuration information to the terminal device or sends the first configuration information and the second configuration information.

In some embodiments, the first configuration information and/or the second configuration information may be carried in the system broadcast message of the serving cell.

As another implementation, the various parameters mentioned above can be predefined (such as protocol predefined) or preconfigured. For example, the first to eighth parameters mentioned above are all predefined or preconfigured.

As another implementation, some of the parameters mentioned above can be configured by the network device, while others can be predefined or preconfigured. For example, the first to seventh parameters are configured by the network device, while the eighth parameter is predefined or preconfigured. Alternatively, the first to fifth parameters are configured by the network device, while the sixth to eighth parameters are predefined or preconfigured.

In some embodiments, the network device may instruct the terminal device whether it is permitted to trigger cell reselection before the cell reselection conditions are met. As one implementation, the terminal device may receive instruction information sent by the network device. Accordingly, the network device may send instruction information to the terminal device. This instruction information can be used to indicate whether the terminal device is permitted to trigger cell reselection before the cell reselection conditions are met.

In some embodiments, when the indication information indicates that the terminal device is allowed to trigger cell reselection before the cell reselection conditions are met, the terminal device may perform the aforementioned preset behavior when the first event is met.

In some embodiments, the terminal device may send capability information to the network device, and correspondingly, the network device may receive the capability information sent by the terminal device. This capability information is used to indicate whether the terminal device supports triggering cell reselection before the cell reselection conditions are met.

The method embodiments of this application have been described in detail above with reference to Figures 1 to 3. The apparatus embodiments of this application will be described in detail below with reference to Figures 4 to 6. It should be understood that the descriptions of the method embodiments correspond to the descriptions of the apparatus embodiments; therefore, any parts not described in detail can be referred to the preceding method embodiments.

Figure 4 is a schematic diagram of the structure of a terminal device provided in an embodiment of this application. The terminal device 400 shown in Figure 4 includes an execution module 410. The execution module 410 can be used to execute a preset behavior if a first event is satisfied, wherein the first event is related to the cell reselection process, and the preset behavior includes the behavior of the terminal device triggering cell reselection before the cell reselection condition is satisfied.

In some embodiments, the first event includes: at a first moment, the terminal device predicts that the measurement result of the first cell at a second moment after a first duration just meets the cell reselection condition; or at a first moment, the terminal device predicts that the measurement result of the first cell at a second moment after a first duration just meets the cell reselection condition. The measurement result of the first cell at the second time exactly meets the cell reselection condition, and the terminal device predicts at the first time that the measurement result of the serving cell of the terminal device at the second time does not meet the cell retention criterion; or at the first time, the terminal device predicts that the measurement result of the serving cell at the fourth time after the first duration will critically meet the cell retention criterion, and the terminal device predicts at the first time that the measurement result of the first cell at the fourth time does not meet the cell reselection condition; wherein, the first cell is a neighboring cell of the terminal device.

In some embodiments, if the frequency priority of the first cell is higher than the frequency priority of the serving cell, the meaning of the measurement result of the first cell at the second time exactly satisfying the cell reselection condition is that when the second time is reached, the duration corresponding to the state where the measurement result of the first cell is greater than the first threshold is equal to the first duration threshold.

In some embodiments, if the frequency priority of the first cell is equal to the frequency priority of the serving cell, the meaning of the measurement result of the first cell at the second time exactly satisfying the cell reselection condition is that when the second time is reached, the terminal device determines that the first cell has the highest ranking according to the first criterion, and the duration corresponding to the state of the first cell having the highest ranking is equal to the first duration threshold.

In some embodiments, if the frequency priority of the first cell is lower than that of the serving cell, the meaning of the measurement result of the first cell at the second time exactly satisfying the cell reselection condition is that when the second time is reached, the duration corresponding to the state where the first condition is satisfied is equal to the first duration threshold, wherein the first condition is that the measurement result of the first cell is greater than the second threshold and the measurement result of the serving cell is less than the third threshold.

In some embodiments, the preset behavior includes any one of the following: at the first time, the terminal device determines the first cell as the target cell and reselects to the first cell; at the third time, the terminal device determines the first cell as the target cell and reselects to the first cell, the third time being a future time of the first time and the time interval between the third time and the first time being a second duration; at the fourth time, the terminal device determines the first cell as the target cell and reselects to the first cell, and at the fourth time, the measurement result of the serving cell critically satisfies the cell retention criterion; at the fifth time, the terminal device determines the first cell as the target cell and reselects to the first cell, and at the fifth time, the measurement result of the first cell is greater than a fourth threshold; at the sixth time, the terminal device determines the first... At the sixth time, the terminal device determines the first cell as the target cell and reselects to it, and the second condition is met. At the seventh time, the terminal device determines the first cell as the target cell and reselects to it, and the measurement result of the serving cell is less than the fifth threshold. At the eighth time, the terminal device determines the first cell as the target cell and reselects to it, and the measurement result of the first cell is greater than the sixth threshold and the measurement result of the serving cell is less than the seventh threshold. At the ninth time, the terminal device determines the first cell as the target cell and reselects to it, and the third condition is met. At the tenth time, the terminal device determines the first cell as the target cell and reselects to it, and the tenth time is any time between the first time and the fourth time.

In some embodiments, if the frequency priority of the first cell is higher than the frequency priority of the serving cell, the second condition is that the measurement result of the first cell is greater than the first threshold.

In some embodiments, if the frequency priority of the first cell is equal to the frequency priority of the serving cell, the second condition is that the first cell is ranked highest according to the first criterion.

In some embodiments, if the frequency priority of the first cell is lower than the frequency priority of the serving cell, the second condition is that the measurement result of the first cell is greater than a second threshold and the measurement result of the serving cell is less than a third threshold.

In some embodiments, if the frequency priority of the first cell is higher than the frequency priority of the serving cell, the third condition is that the measurement result of the first cell is greater than a first threshold and the measurement result of the serving cell is less than an eighth threshold.

In some embodiments, if the frequency priority of the first cell is equal to the frequency priority of the serving cell, the third condition is that the first cell is ranked highest according to the first criterion and the measurement result of the serving cell is less than the ninth threshold.

In some embodiments, the terminal device further includes: a first receiving module 420, configured to receive first configuration information sent by a network device, the first configuration information being related to the terminal device triggering cell reselection before the cell reselection condition is met, the first configuration information including any one of the following: a first parameter, the first parameter indicating the value of the second duration; or a second parameter, the second parameter indicating the value of the fourth threshold; or a third parameter, the third parameter indicating the value of the fifth threshold; or a fourth parameter and a fifth parameter, the fourth parameter indicating the value of the sixth threshold and the fifth parameter indicating the value of the seventh threshold; or a sixth parameter, the sixth parameter indicating the value of the eighth threshold; or a seventh parameter, the seventh parameter indicating the value of the ninth threshold; or a sixth parameter and a seventh parameter, the sixth parameter indicating the value of the eighth threshold and the seventh parameter indicating the value of the ninth threshold.

In some embodiments, the terminal device further includes: a second receiving module, configured to receive second configuration information sent by a network device, the second configuration information being related to the first event, the second configuration information including an eighth parameter, the eighth parameter being used to indicate the value of the first duration.

In some embodiments, the behavior of the terminal device triggering cell reselection before the cell reselection condition is met further includes satisfying a fourth condition, wherein the fourth condition is that the terminal device's dwell time in the serving cell exceeds a third duration; wherein the third duration is used to indicate The terminal device needs to stay in the serving cell for the minimum duration required.

In some embodiments, the speed state of the terminal device includes one or more of the following: normal speed state, medium speed state, and high speed state. The terminal device further includes a scaling module for scaling a first duration threshold if the speed state of the terminal device is the medium speed state or the high speed state.

In some embodiments, the terminal device further includes: a third receiving module, configured to receive indication information sent by the network device, the indication information being used to indicate whether the terminal device is allowed to trigger cell reselection before the cell reselection conditions are met.

In some embodiments, the terminal device further includes: a sending module, configured to send capability information to the network device, the capability information being used to indicate whether the terminal device supports triggering cell reselection before the cell reselection conditions are met.

In some embodiments, the execution module 410 may be a processor 610. The terminal device 400 may also include a transceiver 630 and a memory 620, as shown in FIG6.

Figure 5 is a schematic diagram of the network device provided in an embodiment of this application. The network device 500 shown in Figure 5 includes a first sending module 510. The first sending module 510 is used to send second configuration information to a terminal device. The second configuration information is related to a first event. The second configuration information includes an eighth parameter, which is used to indicate the value of a first duration. The first duration is used to indicate the length of the time window for the terminal device to predict the cell measurement results. The first event includes: the measurement result of the first cell at the second time after the first duration is predicted at the first time exactly meets the cell reselection condition; or the measurement result of the first cell at the second time after the first duration is predicted at the first time exactly meets the cell reselection condition and the measurement result of the serving cell of the terminal device at the second time is predicted at the first time not to meet the cell retention criterion; or the measurement result of the serving cell at the fourth time after the first duration is predicted at the first time critically meets the cell retention criterion and the measurement result of the first cell at the fourth time is predicted at the first time not to meet the cell reselection condition. The first cell is a neighboring cell of the terminal device.

In some embodiments, the network device further includes: a second sending module 520, configured to send first configuration information to the terminal device, the first configuration information being related to the terminal device's behavior of triggering cell reselection before the cell reselection conditions are met, the first configuration information including any one of the following: a first parameter, the first parameter indicating the value of a second duration; or a second parameter, the second parameter indicating the value of a fourth threshold; or a third parameter, the third parameter indicating the value of a fifth threshold; or a fourth parameter and a fifth parameter, the fourth parameter indicating the value of a sixth threshold and the fifth parameter indicating the value of a seventh threshold; or a sixth parameter, the sixth parameter indicating the value of an eighth threshold; or a seventh parameter, the seventh parameter indicating the value of a ninth threshold; or a sixth parameter and a seventh parameter, the sixth parameter indicating the value of an eighth threshold and the seventh parameter indicating the value of a ninth threshold.

In some embodiments, the network device further includes: a third sending module, configured to send indication information to the terminal device, the indication information being used to indicate whether the terminal device is allowed to trigger cell reselection before the cell reselection conditions are met.

In some embodiments, the network device further includes: a receiving module, configured to receive capability information sent by a terminal device, the capability information being used to indicate whether the terminal device supports triggering cell reselection before the cell reselection conditions are met.

In some embodiments, the first transmitting module 410 may be a transceiver 630. The network device 500 may also include a processor 610 and a memory 620, as shown in FIG6.

Figure 6 is a schematic structural diagram of a communication device according to an embodiment of this application. The dashed lines in Figure 6 indicate that the unit or module is optional. This device 600 can be used to implement the methods described in the above method embodiments. Device 600 can be a chip, a terminal device, or a network device.

Apparatus 600 may include one or more processors 610. The processor 610 may support apparatus 600 in implementing the methods described in the preceding method embodiments. The processor 610 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor.

The apparatus 600 may further include one or more memories 620. The memories 620 store a program that can be executed by the processor 610, causing the processor 610 to perform the methods described in the preceding method embodiments. The memories 620 may be independent of the processor 610 or integrated within the processor 610.

The device 600 may also include a transceiver 630. The processor 610 can communicate with other devices or chips via the transceiver 630. For example, the processor 610 can send and receive data with other devices or chips via the transceiver 630.

This application also provides a computer-readable storage medium for storing a program. This computer-readable storage medium can be applied to a terminal device or network device provided in this application embodiment, and the program causes a computer to execute the methods performed by the terminal device or network device in the various embodiments of this application.

This application also provides a computer program product. The computer program product includes a program. This computer program product can be applied to a terminal device or network device provided in the embodiments of this application, and the program causes a computer to execute the methods performed by the terminal device or network device in the various embodiments of this application.

This application also provides a computer program. This computer program can be applied to the terminal device or network device provided in this application, and the computer program causes the computer to execute the methods performed by the terminal device or network device in various embodiments of this application.

It should be understood that the terms "system" and "network" in this application can be used interchangeably. Furthermore, the terminology used in this application is only for explaining specific embodiments of the application and is not intended to limit the application. The terms "first," "second," "third," and "fourth," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. In addition, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

In the embodiments of this application, the term "instruction" can be a direct instruction, an indirect instruction, or an indication of a relationship. For example, A instructing B can mean that A directly instructs B, such as B being able to obtain information through A; it can also mean that A indirectly instructs B, such as A instructing C, so B can obtain information through C; or it can mean that there is a relationship between A and B.

In the embodiments of this application, "B corresponding to A" means that B is associated with A, and B can be determined based on A. However, it should also be understood that determining B based on A does not mean that B is determined solely based on A; B can also be determined based on A and/or other information.

In the embodiments of this application, the term "correspondence" can indicate a direct or indirect correspondence between two things, or an association between two things, or a relationship such as instruction and being instructed, configuration and being configured.

In the embodiments of this application, the term "comprising" can refer to direct inclusion or indirect inclusion. Optionally, "comprising" in the embodiments of this application can be replaced with "instructing" or "used to determine". For example, "A includes B" can be replaced with "A instructs B" or "A is used to determine B".

In this application embodiment, "predefined" or "preconfigured" can be implemented by pre-storing corresponding codes, tables, or other means that can be used to indicate relevant information in the device (e.g., including terminal devices and network devices). This application does not limit the specific implementation method. For example, predefined can refer to what is defined in the protocol.

In this application embodiment, the "protocol" may refer to a standard protocol in the field of communication, such as the LTE protocol, the NR protocol, and related protocols applied to future communication systems. This application does not limit this.

In the embodiments of this application, the term "and/or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and/or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character "/" in this document generally indicates that the preceding and following related objects have an "or" relationship.

In the various embodiments of this application, the order of the above-mentioned processes does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can read or a data storage device such as a server or data center that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., digital video discs (DVDs)), or semiconductor media (e.g., solid-state drives (SSDs)).

The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims (45)

A method for wireless communication, characterized in that it includes: If the first event is met, the terminal device executes a preset behavior, wherein the first event is related to the cell reselection process, and the preset behavior includes the terminal device triggering cell reselection before the cell reselection conditions are met. The method according to claim 1, wherein the first event includes: At the first moment, the terminal device predicts that the measurement result of the first cell at the second moment after the first duration will just meet the cell reselection condition; or At the first moment, the terminal device predicts that the measurement result of the first cell at the second moment after the first duration just meets the cell reselection condition, and at the first moment, the terminal device predicts that the measurement result of the serving cell of the terminal device at the second moment does not meet the cell retention criterion; or At the first moment, the terminal device predicts that the measurement result of the serving cell at the fourth moment after the first duration will critically meet the cell retention criterion, and at the first moment, the terminal device predicts that the measurement result of the first cell at the fourth moment will not meet the cell reselection condition. The first cell is a neighboring cell of the terminal device. According to the method of claim 2, if the frequency priority of the first cell is higher than the frequency priority of the serving cell, the meaning of the measurement result of the first cell at the second time exactly satisfying the cell reselection condition is that when the second time is reached, the duration corresponding to the state where the measurement result of the first cell is greater than the first threshold is equal to the first duration threshold. According to the method of claim 2 or 3, the meaning of "if the frequency priority of the first cell is equal to the frequency priority of the serving cell, the measurement result of the first cell at the second time just satisfies the cell reselection condition" is that when the second time is reached, the terminal device determines that the first cell has the highest ranking according to the first criterion, and the duration corresponding to the state of the first cell having the highest ranking is equal to the first duration threshold. The method according to any one of claims 2-4 is characterized in that, if the frequency priority of the first cell is lower than the frequency priority of the serving cell, the meaning of the measurement result of the first cell at the second time exactly satisfying the cell reselection condition is that when the second time is reached, the duration corresponding to the state where the first condition is satisfied and the first condition is satisfied is equal to the first duration threshold, wherein the first condition is that the measurement result of the first cell is greater than the second threshold and the measurement result of the serving cell is less than the third threshold. The method according to any one of claims 2-5, characterized in that the preset behavior includes any one of the following: At the first moment, the terminal device determines the first cell as the target cell and reselects to the first cell; Upon reaching the third time, the terminal device determines the first cell as the target cell and reselects to the first cell. The third time is a future time of the first time, and the time interval between the third time and the first time is a second duration. Upon reaching the fourth time, the terminal device determines the first cell as the target cell and reselects to the first cell, and at the fourth time, the measurement result of the serving cell critically satisfies the cell retention criterion; At the fifth time point, the terminal device determines the first cell as the target cell and reselects to the first cell, and at the fifth time point, the measurement result of the first cell is greater than the fourth threshold. At the sixth time, the terminal device determines the first cell as the target cell and reselects to the first cell, and the second condition is satisfied at the sixth time; At the seventh time, the terminal device determines the first cell as the target cell and reselects to the first cell, and at the seventh time, the measurement result of the serving cell is less than the fifth threshold; At the eighth time, the terminal device determines the first cell as the target cell and reselects to the first cell. At the eighth time, the measurement result of the first cell is greater than the sixth threshold and the measurement result of the serving cell is less than the seventh threshold. At the ninth time, the terminal device determines the first cell as the target cell and reselects to the first cell, and the third condition is met at the ninth time; Upon reaching the tenth time, the terminal device determines the first cell as the target cell and reselects to the first cell. The tenth time is any time between the first time and the fourth time. According to the method of claim 6, if the frequency priority of the first cell is higher than the frequency priority of the serving cell, the second condition is that the measurement result of the first cell is greater than the first threshold. The method according to claim 6 or 7 is characterized in that, if the frequency priority of the first cell is equal to the frequency priority of the serving cell, the second condition is that the first cell is ranked highest according to the first criterion. The method according to any one of claims 6-8 is characterized in that, if the frequency priority of the first cell is lower than the frequency priority of the serving cell, the second condition is that the measurement result of the first cell is greater than a second threshold and the measurement result of the serving cell is less than a third threshold. According to the method of claim 6, if the frequency priority of the first cell is higher than the frequency priority of the serving cell, the third condition is that the measurement result of the first cell is greater than the first threshold and the measurement result of the serving cell is less than the first threshold. Eight thresholds. The method according to claim 6 or 10 is characterized in that, if the frequency priority of the first cell is equal to the frequency priority of the serving cell, the third condition is that the first cell is ranked highest according to the first criterion and the measurement result of the serving cell is less than the ninth threshold. The method according to claim 6, 10, or 11, characterized in that the method further comprises: The terminal device receives first configuration information sent by the network device. The first configuration information is related to the terminal device's behavior of triggering cell reselection before the cell reselection conditions are met. The first configuration information includes any one of the following: The first parameter indicates the value of the second duration; or The second parameter indicates the value of the fourth threshold; or The third parameter, which indicates the value of the fifth threshold; or The fourth parameter and the fifth parameter, wherein the fourth parameter indicates the value of the sixth threshold and the fifth parameter indicates the value of the seventh threshold; or The sixth parameter, which indicates the value of the eighth threshold; or The seventh parameter, which indicates the value of the ninth threshold; or The sixth parameter and the seventh parameter, wherein the sixth parameter is used to indicate the value of the eighth threshold and the seventh parameter is used to indicate the value of the ninth threshold. The method according to any one of claims 2-12, characterized in that the method further comprises: The terminal device receives second configuration information sent by the network device. The second configuration information is related to the first event. The second configuration information includes an eighth parameter, which is used to indicate the value of the first duration. The method according to any one of claims 1-13 is characterized in that the behavior of the terminal device triggering cell reselection before the cell reselection condition is met further includes satisfying a fourth condition, wherein the fourth condition is that the dwell time of the terminal device in the serving cell exceeds a third duration; wherein the third duration is used to indicate the minimum dwell time required for the terminal device in the serving cell. The method according to any one of claims 1-14, characterized in that the speed state of the terminal device includes one or more of the following: normal speed state, medium speed state, high speed state, and the method further includes: If the speed state of the terminal device is the medium speed state or the high speed state, the terminal device scales the first duration threshold. The method according to any one of claims 1-15, characterized in that the method further comprises: The terminal device receives an indication message sent by the network device. The indication message is used to indicate whether the terminal device is allowed to trigger cell reselection before the cell reselection conditions are met. A method for wireless communication, characterized in that it includes: The network device sends second configuration information to the terminal device. The second configuration information is related to the first event. The second configuration information includes an eighth parameter, which is used to indicate the value of a first duration. The first duration is used to indicate the length of the time window for the terminal device to predict the cell measurement results. The first event includes: The measurement results of the first cell at the second time after the first time duration are predicted at the first time moment exactly meet the cell reselection conditions; or If the measurement result of the first cell at the second time after the first time is predicted to meet the cell reselection criteria, and the measurement result of the serving cell of the terminal device at the second time is predicted to not meet the cell retention criteria; or The measurement results of the serving cell at the fourth time after the first time are predicted at the first time critically meet the cell retention criterion, and the measurement results of the first cell at the fourth time are predicted at the first time do not meet the cell reselection condition. The first cell is a neighboring cell of the terminal device. The method according to claim 17, characterized in that the method further comprises: The network device sends first configuration information to the terminal device. The first configuration information is related to the behavior of the terminal device in triggering cell reselection before the cell reselection conditions are met. The first configuration information includes any one of the following: The first parameter, used to indicate the value of the second duration; or The second parameter indicates the value of the fourth threshold; or The third parameter, which indicates the value of the fifth threshold; or The fourth parameter and the fifth parameter, wherein the fourth parameter indicates the value of the sixth threshold and the fifth parameter indicates the value of the seventh threshold; or The sixth parameter, which indicates the value of the eighth threshold; or The seventh parameter, which indicates the value of the ninth threshold; or The sixth parameter and the seventh parameter, wherein the sixth parameter is used to indicate the value of the eighth threshold and the seventh parameter is used to indicate the value of the ninth threshold. The method according to claim 17 or 18, characterized in that the method further comprises: The network device sends an indication message to the terminal device, the indication message being used to indicate whether the terminal device is allowed to trigger cell reselection before the cell reselection conditions are met. A terminal device, characterized in that it comprises: An execution module is configured to execute a preset behavior if a first event is met, wherein the first event is related to the cell reselection process, and the preset behavior includes the behavior of the terminal device triggering cell reselection before the cell reselection conditions are met. The terminal device according to claim 20, wherein the first event includes: At the first moment, the terminal device predicts that the measurement result of the first cell at the second moment after the first duration will just meet the cell reselection condition; or At the first moment, the terminal device predicts that the measurement result of the first cell at the second moment after the first duration just meets the cell reselection condition, and at the first moment, the terminal device predicts that the measurement result of the serving cell of the terminal device at the second moment does not meet the cell retention criterion; or At the first moment, the terminal device predicts that the measurement result of the serving cell at the fourth moment after the first duration will critically meet the cell retention criterion, and at the first moment, the terminal device predicts that the measurement result of the first cell at the fourth moment will not meet the cell reselection condition. The first cell is a neighboring cell of the terminal device. The terminal device according to claim 21 is characterized in that, if the frequency priority of the first cell is higher than the frequency priority of the serving cell, the meaning of the measurement result of the first cell at the second time exactly satisfying the cell reselection condition is that when the second time is reached, the duration corresponding to the state where the measurement result of the first cell is greater than the first threshold is equal to the first duration threshold. The terminal device according to claim 21 or 22 is characterized in that, if the frequency priority of the first cell is equal to the frequency priority of the serving cell, the meaning of the measurement result of the first cell at the second time exactly satisfying the cell reselection condition is that when the second time is reached, the terminal device determines that the first cell has the highest ranking according to the first criterion, and the duration corresponding to the state of the first cell having the highest ranking is equal to the first duration threshold. The terminal device according to any one of claims 21-23 is characterized in that, if the frequency priority of the first cell is lower than the frequency priority of the serving cell, the meaning of the measurement result of the first cell at the second time exactly satisfying the cell reselection condition is that when the second time is reached, the duration corresponding to the state where the first condition is satisfied and the first condition is satisfied is equal to the first duration threshold, wherein the first condition is that the measurement result of the first cell is greater than the second threshold and the measurement result of the serving cell is less than the third threshold. The terminal device according to any one of claims 21-24, wherein the preset behavior includes any one of the following: At the first moment, the terminal device determines the first cell as the target cell and reselects to the first cell; Upon reaching the third time, the terminal device determines the first cell as the target cell and reselects to the first cell. The third time is a future time of the first time, and the time interval between the third time and the first time is a second duration. Upon reaching the fourth time, the terminal device determines the first cell as the target cell and reselects to the first cell, and at the fourth time, the measurement result of the serving cell critically satisfies the cell retention criterion; At the fifth time point, the terminal device determines the first cell as the target cell and reselects to the first cell, and at the fifth time point, the measurement result of the first cell is greater than the fourth threshold. At the sixth time, the terminal device determines the first cell as the target cell and reselects to the first cell, and the second condition is satisfied at the sixth time; At the seventh time, the terminal device determines the first cell as the target cell and reselects to the first cell, and at the seventh time, the measurement result of the serving cell is less than the fifth threshold; At the eighth time, the terminal device determines the first cell as the target cell and reselects to the first cell. At the eighth time, the measurement result of the first cell is greater than the sixth threshold and the measurement result of the serving cell is less than the seventh threshold. At the ninth time, the terminal device determines the first cell as the target cell and reselects to the first cell, and the third condition is met at the ninth time; Upon reaching the tenth time, the terminal device determines the first cell as the target cell and reselects to the first cell. The tenth time is any time between the first time and the fourth time. The terminal device according to claim 25 is characterized in that, if the frequency priority of the first cell is higher than the frequency priority of the serving cell, the second condition is that the measurement result of the first cell is greater than the first threshold. The terminal device according to claim 25 or 26 is characterized in that, if the frequency priority of the first cell is equal to the frequency priority of the serving cell, the second condition is that the first cell is ranked highest according to the first criterion. The terminal device according to any one of claims 25-27 is characterized in that, if the frequency priority of the first cell is lower than the frequency priority of the serving cell, the second condition is that the measurement result of the first cell is greater than a second threshold and the measurement result of the serving cell is less than a third threshold. The terminal device according to claim 25, characterized in that, if the frequency priority of the first cell is higher than that of the service... The frequency priority of the cell, the third condition is that the measurement result of the first cell is greater than the first threshold and the measurement result of the serving cell is less than the eighth threshold. The terminal device according to claim 25 or 29 is characterized in that, if the frequency priority of the first cell is equal to the frequency priority of the serving cell, the third condition is that the first cell is ranked highest according to the first criterion and the measurement result of the serving cell is less than the ninth threshold. The terminal device according to claim 25, 29, or 30, characterized in that the terminal device further comprises: A first receiving module is configured to receive first configuration information sent by a network device. The first configuration information is related to the behavior of the terminal device in triggering cell reselection before the cell reselection conditions are met. The first configuration information includes any one of the following: The first parameter indicates the value of the second duration; or The second parameter indicates the value of the fourth threshold; or The third parameter, which indicates the value of the fifth threshold; or The fourth parameter and the fifth parameter, wherein the fourth parameter indicates the value of the sixth threshold and the fifth parameter indicates the value of the seventh threshold; or The sixth parameter, which indicates the value of the eighth threshold; or The seventh parameter, which indicates the value of the ninth threshold; or The sixth parameter and the seventh parameter, wherein the sixth parameter is used to indicate the value of the eighth threshold and the seventh parameter is used to indicate the value of the ninth threshold. The terminal device according to any one of claims 21-31, characterized in that the terminal device further comprises: The second receiving module is used to receive second configuration information sent by the network device. The second configuration information is related to the first event. The second configuration information includes an eighth parameter, which is used to indicate the value of the first duration. The terminal device according to any one of claims 20-32 is characterized in that the behavior of triggering cell reselection before the cell reselection condition is met further includes satisfying a fourth condition, wherein the fourth condition is that the dwell time of the terminal device in the serving cell exceeds a third duration; wherein the third duration is used to indicate the minimum dwell time required for the terminal device in the serving cell. The terminal device according to any one of claims 20-33, characterized in that the speed state of the terminal device includes one or more of the following: normal speed state, medium speed state, high speed state, and the terminal device further includes: A scaling module is used to scale the first duration threshold if the speed state of the terminal device is the medium speed state or the high speed state. The terminal device according to any one of claims 20-34, characterized in that the terminal device further comprises: The third receiving module is used to receive indication information sent by the network device. The indication information is used to indicate whether the terminal device is allowed to trigger cell reselection before the cell reselection conditions are met. A network device, characterized in that it comprises: A first sending module is used to send second configuration information to a terminal device. The second configuration information is related to a first event. The second configuration information includes an eighth parameter, which is used to indicate the value of a first duration. The first duration is used to indicate the length of the time window for the terminal device to predict the cell measurement results. The first event includes: The measurement results of the first cell at the second time after the first time duration are predicted at the first time moment exactly meet the cell reselection conditions; or If the measurement result of the first cell at the second time after the first time is predicted to meet the cell reselection criteria, and the measurement result of the serving cell of the terminal device at the second time is predicted to not meet the cell retention criteria; or The measurement results of the serving cell at the fourth time after the first time are predicted at the first time critically meet the cell retention criterion, and the measurement results of the first cell at the fourth time are predicted at the first time do not meet the cell reselection condition. The first cell is a neighboring cell of the terminal device. The network device according to claim 36, wherein the network device further comprises: The second sending module is configured to send first configuration information to the terminal device. The first configuration information is related to the behavior of the terminal device in triggering cell reselection before the cell reselection conditions are met. The first configuration information includes any one of the following: The first parameter, used to indicate the value of the second duration; or The second parameter indicates the value of the fourth threshold; or The third parameter, which indicates the value of the fifth threshold; or The fourth parameter and the fifth parameter, wherein the fourth parameter indicates the value of the sixth threshold and the fifth parameter indicates the value of the seventh threshold; or The sixth parameter, which indicates the value of the eighth threshold; or The seventh parameter, which indicates the value of the ninth threshold; or The sixth parameter and the seventh parameter, wherein the sixth parameter indicates the value of the eighth threshold and the seventh parameter indicates the ninth threshold. The value of . The network device according to claim 36 or 37, characterized in that the network device further comprises: The third sending module is used to send indication information to the terminal device, the indication information being used to indicate whether the terminal device is allowed to trigger cell reselection before the cell reselection conditions are met. A terminal device, characterized in that it includes a memory and a processor, the memory being used to store a program, and the processor being used to invoke the program in the memory to cause the terminal device to perform the method as described in any one of claims 1-16. A network device is characterized by comprising a transceiver, a memory, and a processor, wherein the memory is used to store a program, the processor is used to invoke the program in the memory, and to control the transceiver to receive or transmit signals, so that the network device performs the method as described in any one of claims 17-19. An apparatus, characterized in that it includes a processor for calling a program from a memory to cause the apparatus to perform the method as described in any one of claims 1-16 or 17-19. A chip, characterized in that it includes a processor for calling a program from memory to cause a device on which the chip is mounted to perform the method as described in any one of claims 1-16 or 17-19. A computer-readable storage medium, characterized in that it stores a program thereon that causes a computer to perform the method as described in any one of claims 1-16 or 17-19. A computer program product, characterized in that it includes a program that causes a computer to perform the method as described in any one of claims 1-16 or 17-19. A computer program, characterized in that the computer program causes a computer to perform the method as described in any one of claims 1-16 or 17-19.