CN101730164A - Method and terminal for reselecting cell - Google Patents

Abstract

The embodiment of the present invention discloses a cell reselection method and a terminal. The cell reselection method includes: acquiring aggregated preferred cell layer aggregation information sent by the network side; when the signal quality of the serving cell is lower than the same-frequency measurement threshold Or when the cell-specific threshold is aggregated, measure the signal quality of the cells in the aggregated preferred cell layer according to the aggregation information of the aggregated preferred cell layer; perform cell reselection according to the measurement result. In the embodiment of the present invention, when the signal quality of the serving cell is lower than the same-frequency measurement threshold or the aggregated cell-specific threshold, the signal quality of the cell in the aggregated preferred cell layer will be measured, and cell reselection is performed according to the measurement result, which can increase the terminal parking rate. The possibility of staying on the aggregated cell further reduces the probability of operations such as switching or redirection when the terminal needs to initiate high-speed services, thereby also reducing the probability of paging failure.

Description

Method and terminal for cell reselection

technical field

The present invention relates to the field of communication technology, in particular to a cell reselection method and terminal.

Background technique

In order to maintain continuous competitiveness, the Third Generation Partnership Project (Third Generation Partnership Project, 3GPP) organization formally established the Long Term Evolution (LTE) research project at the end of 2004. The starting point of LTE is to ensure the competitiveness of 3GPP in the next ten years, so that the system can be comprehensively improved in terms of performance, function and cost. In March 2008, 3GPP launched the Advanced Long Term Evolution (LTE-Advanced) project, whose goal is to support higher peak rates, higher spectral efficiency, and higher user throughput and number of users . The advanced long-term evolution system supports carrier aggregation technology, so as to provide large bandwidth and high-speed services.

In the prior art, cell reselection priorities are divided into absolute priority (Absolute priority) and terminal-specific priority (UE specific priority), both of which are based on frequency division, that is to say, cells on the same frequency have the same priority. Wherein, the absolute priority is broadcast in the cell broadcast, and the terminal obtains it by reading the broadcast, and the network side can also set the terminal-specific priority to the terminal through dedicated signaling.

In the LTE-Advanced system, the aggregation function is introduced, that is, multiple carriers can be aggregated together. For LTE terminals, one aggregated cell can be regarded as multiple LTE cells. For LTE-Advanced terminals, these carriers Together they form an LTE-Advanced aggregation cell.

According to the existing technology, if the specific priority of the terminal is set, the aggregated cell has a high priority for the LTE-Advanced terminal, and the non-aggregated cell with the same frequency as the aggregated cell also has the same high priority for the terminal. The priority cannot play a good role in the priority of the aggregation cell.

Contents of the invention

Embodiments of the present invention provide a cell reselection method and a terminal. By using the technical solution provided by the embodiment of the present invention, the possibility of reselecting a terminal to an aggregated cell can be increased.

The purpose of the embodiments of the present invention is achieved through the following technical solutions:

A method for cell reselection, comprising:

Obtain the aggregation information of the aggregation preferred cell layer sent by the network side;

When the signal quality of the serving cell is lower than the intra-frequency measurement threshold or the aggregated cell-specific threshold, measure the signal quality of the cells in the aggregated preferred cell layer according to the aggregation information of the aggregated preferred cell layer;

Perform cell reselection according to the measurement result.

A method for cell reselection, comprising:

Obtain the information of the aggregated carrier layer sent by the network side;

When the signal quality of the serving carrier is lower than the intra-frequency measurement threshold or the aggregated cell-specific threshold, measure the signal quality of the aggregated carrier layer according to the information of the aggregated carrier layer;

Perform cell reselection according to the measurement result.

A terminal comprising:

an obtaining unit, configured to obtain the aggregation information of the aggregated preferred cell layer sent by the network side;

A judging unit, configured to judge whether the signal quality of the serving cell is lower than the same-frequency measurement threshold, or to judge whether the signal quality of the serving cell is lower than the aggregated cell-specific threshold;

a measuring unit, configured to measure the aggregation according to the aggregation information of the aggregation preferred cell layer obtained by the acquisition unit when the judging unit judges that the signal quality of the serving cell is lower than the intra-frequency measurement threshold or the aggregation cell-specific threshold; Optimizing the signal quality of cells in the cell layer;

A reselection unit, configured to perform cell reselection according to the measurement result of the measurement unit.

A terminal comprising:

an information acquisition unit, configured to acquire information on the aggregated carrier layer sent by the network side;

The comparison unit is used to compare whether the signal quality of the serving carrier is lower than the same-frequency measurement threshold, or whether the signal quality of the serving carrier is lower than the aggregated cell-specific threshold;

A signal measurement unit, configured to measure the aggregation according to the information of the aggregation carrier layer obtained by the information acquisition unit when the comparison unit obtains that the signal quality of the serving carrier is lower than the same-frequency measurement threshold or the aggregation cell-specific threshold The signal quality of the carrier layer;

A cell reselection unit, configured to perform cell reselection according to the result measured by the signal measurement unit.

From the above technical solutions provided by the embodiments of the present invention, it can be seen that when the signal quality of the serving cell is lower than the intra-frequency measurement threshold or the aggregated cell-specific threshold, the signal quality of the cell or carrier in the aggregated preferred cell layer will be measured, according to Cell reselection based on the measurement results can increase the possibility of the terminal camping on the aggregated cell, thereby reducing the probability of handover or redirection when the terminal needs to initiate high-speed services, thereby reducing the probability of paging failure .

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a flowchart of a cell reselection method described in Embodiment 1 of the present invention;

FIG. 2 is a flowchart of a cell reselection method described in Embodiment 2 of the present invention;

FIG. 3 is a flowchart of a cell reselection method described in Embodiment 3 of the present invention;

FIG. 4 is a schematic composition diagram of a terminal described in an embodiment of the present invention;

FIG. 5 is a schematic composition diagram of another terminal described in an embodiment of the present invention;

FIG. 6 is a block diagram of a communication system described in an embodiment of the present invention;

Fig. 7 is a block diagram of another communication system described in the embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Embodiments of the present invention provide a cell reselection method and a terminal. By using the technical solution provided by the embodiment of the present invention, the possibility of reselecting a terminal to an aggregated cell can be increased.

Due to the existing measurement criteria, when the signal quality of the current serving cell of the terminal is lower than the threshold for starting intra-frequency measurement but greater than the threshold for starting inter-frequency measurement, the terminal only performs intra-frequency measurement and measures high-priority neighboring cells, The other carriers with the same priority in the aggregated cell where the terminal is located will not be measured. Only when the signal quality of the current serving cell of the terminal is lower than the threshold for starting inter-frequency measurement, the terminal will measure the same and low priority carriers. frequency to measure. In this way, when the frequency of the adjacent non-aggregated cell is the same as that of a certain carrier frequency in the aggregated cell where the terminal is currently camping, for the terminal, it will first reselect to the adjacent non-aggregated cell instead of in the aggregated cell. re-election. Non-aggregated cells cannot support high-speed services. Therefore, when a terminal initiates a high-speed service, it needs to be switched or redirected to an adjacent aggregated cell. This will increase the connection establishment delay and may also cause connection establishment failure. Therefore, it is necessary to propose a method for cell reselection, so that within the coverage of the aggregated cell, the possibility of LTE-Advanced terminals camping on the aggregated cell is increased, so as to reduce the need for handover or redirection when the terminal needs to initiate high-speed services. probability of operation.

For an LTE-Advanced terminal residing in an aggregated cell, when the signal quality of the terminal's current serving cell is lower than the threshold for starting intra-frequency measurement, not only the intra-frequency neighbor cell measurement is performed, but also the aggregated cell in which the terminal is located Measurements are performed on the LTE cells corresponding to the rest of the carriers. Therefore, during cell selection, the aggregated cells corresponding to the remaining carriers in the aggregated cell where the terminal is located can be sorted together with the adjacent cells of the same frequency. For an LTE-Advanced terminal, the aggregated cell-specific offset is increased, so that the possibility of the terminal reselecting to the aggregated cell is increased during the cell reselection sorting process.

First, a cell reselection method is described.

Embodiment one

This embodiment describes a method for cell reselection, through which the possibility of reselecting a terminal to an aggregated cell can be increased.

Describe in detail below in conjunction with accompanying drawing, referring to Fig. 1, the method for cell reselection described in this embodiment includes the following steps:

Step 101: Obtain the aggregation information of the aggregated preferred cell layer sent by the network side;

The network side sends the aggregation information of the aggregated preferred cell layer to the terminal, which may be notified to the terminal through broadcast or dedicated signaling, and the terminal obtains the aggregated preferred cell layer aggregated information sent by the network side through broadcast or dedicated signaling.

After the terminal obtains the aggregation information of the aggregated preferred cell layer, it can know which cells in the aggregated preferred cell layer need to measure the signal quality. The aggregated preferred cell layer corresponds to a group of LTE cells, and each cell can be unique by its cell ID It can also be uniquely determined by frequency and cell ID.

The concept of the aggregated preferred cell layer mentioned above is only valid within the aggregated cell where the terminal is located.

Step 102: When the signal quality of the serving cell is lower than the intra-frequency measurement threshold or the aggregated cell-specific threshold, measure the signal quality of the cells or carriers in the aggregated preferred cell layer according to the aggregated information of the aggregated preferred cell layer;

When the signal quality of the current serving cell where the terminal is located is lower than the threshold for starting intra-frequency measurement, it is necessary to measure the signal quality of the cells in the aggregated preferred cell layer, and the terminal can use the aggregated information obtained in step 101 on the aggregated preferred cell layer Know which cells need to measure the signal quality.

When the signal quality of the current serving cell where the terminal is located is lower than the dedicated threshold for the aggregated cell, it is necessary to measure the signal quality of the cell in the aggregated preferred cell layer, and the terminal can know the need to Which cell's signal quality is measured.

The above-mentioned intra-frequency measurement threshold is slightly lower than the aggregated cell-specific threshold, so that when it is judged that the signal quality of the current serving cell where the terminal is located is lower than the aggregated cell-specific threshold, the signal quality in the aggregated preferred cell layer can be measured, and the terminal can perform cell reselection.

According to the existing protocol, when the signal quality of the current serving cell is lower than the same-frequency measurement threshold, the terminal may only measure the same-frequency and high-priority cells, and the terminal will easily preferentially select adjacent same-frequency cells. After step 102 in the example, a comparison of the signal quality of the aggregated cell and the adjacent cells of the same frequency is added, thereby increasing the possibility of the terminal camping in the aggregated cell.

Step 103: Perform cell reselection according to the above measurement results.

If the measurement result of the terminal in step 102 shows that the signal quality of the cell in the aggregated preferred cell layer is very high, then the terminal will choose to camp on the aggregated cell. If the terminal measurement results show that the signal quality of the aggregated cell is not high, the terminal will also measure the signal quality of the same-frequency adjacent cells or high-priority cells, and then select the cell with higher signal quality for reselection according to the measurement results .

If the non-aggregated cell is adjacent to the aggregated cell, the method of this embodiment increases the possibility that the terminal is in the aggregated cell and reduces the probability of redirection.

If there are aggregated cells all around, since the LTE cells in the aggregated cell are synchronized, but not necessarily synchronized between the aggregated cells, the time delay for cell reselection between carriers in the aggregated cell is shorter than that between the aggregated cells For the time delay of cell reselection, the method of this embodiment can reduce the number of times of reselection between aggregated cells, thereby reducing the probability of paging failure.

In this embodiment, when the signal quality of the serving cell is lower than the same-frequency measurement threshold or the aggregated cell-specific threshold, the signal quality of the cells in the aggregated preferred cell layer will be measured, and the cell reselection is performed according to the measurement results, which can increase the number of terminal stays. The possibility of aggregated cells further reduces the probability of operations such as switching or redirection when the terminal needs to initiate high-speed services, thereby also reducing the probability of paging failure.

Embodiment 1 describes a method for cell reselection, and Embodiment 2 describes another method for cell reselection.

Embodiment two

This embodiment describes a method for cell reselection. Through this method, the terminal is more likely to be reselected to an aggregated cell.

Describe in detail below in conjunction with accompanying drawing, referring to Fig. 2, the method for cell reselection described in this embodiment includes the following steps:

Step 201: In the aggregation cell, the network side sets the aggregation preferred cell layer;

After the network side sets the aggregated preferred cell layer, the network side notifies the terminals residing in the aggregated cell of the aggregated information of the aggregated cell.

The network side may inform the terminal of the aggregated information of the aggregated cell by means of broadcast or dedicated signaling.

After the terminal obtains the aggregation information of the aggregated preferred cell layer, it can know which cells in the aggregated preferred cell layer need to measure the signal quality. The aggregated preferred cell layer corresponds to a group of LTE cells, and each cell is composed of frequency and physical The ID can be uniquely determined.

The concept of the aggregated preferred cell layer mentioned above is only valid within the aggregated cell where the terminal is located.

Step 202: the terminal sets the cells in the aggregated preferred cell layer to the same priority;

Since the aggregated cell can be regarded as composed of multiple LTE cells, the absolute priorities set by the network side for each carrier are not necessarily the same. When the absolute priorities are different, the cells in the aggregated preferred cell layer are all set to the same priority.

The method of setting the same priority may be that after the network side sets the aggregated preferred cell layer, the LTE-Advanced terminal supporting aggregation sets the cell priority in the aggregated preferred cell layer to the same priority X. The above priority X may be the priority of the highest priority LTE cell in the aggregated cell, or it may be higher than the priority of neighboring cells but not higher than the priority of neighboring closed subscriber group cells.

For example, the aggregated preferred cell layer includes three LTE cells, and their priorities are 4, 5, and 6 respectively, and the priority of the LTE cell with priority 4 is the highest, then step 202 may be to aggregate the preferred cell layer The priority of the cells is set to 4, or the priority of the cells in the aggregated preferred cell layer can be set to 2. Of course, the priority of the cells adjacent to the closed subscriber group should be higher than 2, for example, it can be 1. The cells of the closed subscriber group may be small base stations for home or office use. In LTE, the priority of the cells of the closed user group may be very high.

The LTE-Advanced terminal sets the LTE cells corresponding to the aggregated preferred cell layer in the aggregated cell where it is located to the same priority, so that the terminal can simultaneously measure the signals of the cells or carriers in the aggregated preferred cell layer when performing cell reselection Quality, thereby increasing the possibility of the terminal camping in the aggregated cell, thereby reducing the probability of redirection when the terminal initiates a high-speed service.

Setting the cells in the aggregated preferred cell layer to the same priority is beneficial to the resident load balancing of idle terminals.

For an LTE-Advanced aggregation cell composed of multiple different-frequency LTE cells, if the priority of each different-frequency LTE cell is the same, the resident load balance of idle terminals can be better realized.

Idle state terminal resident load balancing means that an idle state terminal may camp on a certain cell on a certain frequency, and then may initiate a call and monitor paging in this cell, while random access and paging Paging channel resources are limited, so it is not expected that a large number of idle terminals will reside in the same cell, and in this case, the resident load balancing of idle terminals is required.

Certainly, step 202 is an optional step, and such setting may not be performed.

Step 203: When the signal quality of the serving cell is lower than the intra-frequency measurement threshold, the terminal also needs to measure the signal quality of the cells in the aggregated preferred cell layer;

When the signal quality of the serving cell where the terminal is located is lower than the same-frequency measurement threshold, the terminal needs to measure the signal quality of the cells in the aggregated preferred cell layer while measuring the signal quality of the same-frequency and high-priority cells .

Of course, it may also be that when the signal quality of the serving cell where the terminal is located is lower than the specific threshold for the aggregated cell, the terminal measures the signal quality of the cell in the aggregated preferred cell layer. The above aggregated cell-specific threshold is generally slightly higher than the same-frequency measurement threshold, so that the terminal can measure the signal quality of the cells in the aggregated preferred cell layer faster, thereby speeding up the process of reselecting the terminal to the aggregated cell.

According to the existing protocol, when the signal quality of the current serving cell is lower than the same-frequency measurement threshold, the terminal may only measure the same-frequency and high-priority cells, and the terminal will easily preferentially select adjacent same-frequency cells, and adopt step 203 Afterwards, the comparison of the signal quality of the aggregated cell and the adjacent cells of the same frequency is added, thereby increasing the possibility that the terminal resides in the aggregated cell.

Step 204: Obtain the aggregated cell-specific offset of the aggregated preferred cell layer;

Obtain the aggregated cell-specific offset of the aggregated preferred cell layer and use it in the R criterion. In this way, the possibility of the terminal reselecting to the aggregated cell can be increased. The above R criterion is the criterion used for cell reselection in LTE. A result is obtained according to the signal quality of the cell and some offsets, and the cells are sorted. The terminal selects the cell with the best sorting result as the cell reselection. target area.

The above method of setting the aggregated cell-specific offset may be that the network side sets the aggregated cell-specific offset for each carrier in the aggregated cell or adjacent aggregated cells in the system broadcast message or dedicated signaling, and the aggregated cell-specific offset The quantity can be obtained through system simulation or radio resource management algorithm.

Non-aggregated cells can also set aggregated cell-specific offsets for adjacent aggregated cells in the broadcast, which is used in the calculation of the R criterion, thereby increasing the possibility of terminals reselecting to aggregated cells under the same priority.

Due to the addition of dedicated offsets for the remaining carriers in the aggregated cell, the LTE-Advanced terminals originally camped in the aggregated cell try to stay in the aggregated cell, and the LTE-Advanced terminals originally camped in the non-aggregated cell are reselected When , it will also give priority to handover to adjacent aggregated cells.

Step 205: Perform cell reselection according to the measurement result and the aggregated cell-specific offset.

When performing cell reselection, the terminal calculates a result based on the result of cell signal measurement and the dedicated offset of the aggregated cells, sorts the cells, and selects the cell with the best sorting result as the target cell for cell reselection.

In the embodiment of the present invention, when the signal quality of the current serving cell is lower than the intra-frequency measurement threshold or the aggregated cell-specific threshold, the signal quality of the cell or carrier in the aggregated preferred cell layer will be measured, and the cell reselection is performed according to the measurement result, which can It increases the possibility of the terminal staying on the aggregated cell, thereby reducing the probability of handover or redirection when the terminal needs to initiate high-speed services, thereby reducing the probability of paging failure.

Further, setting the priority of the cells in the aggregated preferred cell layer to be the same and higher than that of neighboring cells can make the terminal preferentially measure the signal quality of the cells in the aggregated preferred cell layer, making it possible for the terminal to reselect to the aggregated cell sex increased further.

Further, the possibility of the terminal reselecting to the aggregated cell may be further increased by acquiring the aggregated cell-specific offset.

The above describes a method for the terminal to measure the signal quality of the cell in the aggregated preferred cell layer according to the obtained aggregation information of the aggregated preferred cell layer, and perform cell reselection according to the measurement results. The following describes a method for the terminal to perform cell reselection according to the obtained aggregated carrier layer information. The information measures the signal quality of the aggregated carrier layer, and performs cell reselection according to the measurement result.

Embodiment three

This embodiment describes a method in which the terminal measures the signal quality of the aggregated carrier layer according to the acquired information of the aggregated carrier layer, and performs cell reselection according to the measurement result.

Step 301: Obtain the aggregated carrier layer information sent by the network side;

The terminal may acquire the aggregated carrier layer information sent by the network side through broadcast or dedicated signaling.

The terminal acquiring the information of the aggregated carrier layer may be an LTE-Advanced terminal in a non-aggregated cell, or an LTE-Advanced terminal in an aggregated cell.

Step 302: When the signal quality of the current serving carrier is lower than the same-frequency measurement threshold or the aggregated cell-specific threshold, measure the signal quality of the aggregated carrier layer according to the information of the aggregated carrier layer;

When the signal quality of the current serving carrier is lower than the intra-frequency measurement threshold or the aggregated cell-specific threshold, the terminal needs to measure the signal quality of the aggregated carrier layer.

Before step 302, it may also include: setting the priority of the carriers in the aggregated carrier layer to the same priority; at this time, the step of measuring the signal quality of the aggregated carrier layer according to the information of the aggregated carrier layer in step 302 is specifically: according to the aggregation The carrier layer information measures the signal quality of carriers with the same priority in the aggregated carrier layer.

Setting the priority of the carriers in the aggregated carrier layer to the same priority can better realize load balancing of idle terminals.

Step 303: Perform cell reselection according to the measurement result.

Before step 303, it may also include obtaining the carrier-specific offset of the aggregated carrier layer; at this time, step 303 is specifically: performing cell reselection according to the measurement result and the dedicated offset.

The dedicated offset of the aggregated carrier layer may be stored by the terminal itself, or may be a dedicated offset issued by the network side.

In this embodiment, when the signal quality of the current serving carrier is lower than the same-frequency measurement threshold or the aggregated cell-specific threshold, the signal quality of the aggregated carrier layer is measured, and cell reselection is performed according to the measurement results, which can increase the number of terminals that reside in the aggregated cell. This reduces the probability of operations such as switching or redirection when the terminal needs to initiate high-speed services, thereby reducing the probability of paging failure.

It should be noted that for the foregoing method embodiments, for the sake of simple description, they are expressed as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence. Because of the present invention, certain steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification belong to preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

In the foregoing embodiments, the descriptions of each embodiment have their own emphases, and for parts not described in detail in a certain embodiment, reference may be made to relevant descriptions of other embodiments.

The above provides a cell reselection method, and the embodiment of the present invention also provides a terminal and a communication system.

Firstly, a terminal is described, and the following will be described in detail in conjunction with the accompanying drawings. Referring to FIG. 4, a terminal includes the following units:

The obtaining unit 401 is configured to obtain the aggregation information of the aggregated preferred cell layer sent by the network side;

The acquiring unit 401 may be to acquire aggregated preferred cell layer aggregated information sent by the network side through broadcast or dedicated signaling.

A judging unit 402, configured to judge whether the signal quality of the serving cell is lower than the intra-frequency measurement threshold, or to judge whether the signal quality of the serving cell is lower than the aggregated cell-specific threshold;

The judging unit 402 may judge whether the signal quality of the serving cell where the terminal is located is lower than the threshold for starting intra-frequency measurement, or may judge whether the signal quality of the serving cell where the terminal is located is lower than the aggregated cell-specific threshold. The above aggregated cell-specific threshold is slightly higher than the same-frequency measurement threshold, that is, the judging result that the signal quality of the current serving cell where the terminal is located is lower than the aggregated cell-specific threshold is lower than the signal quality of the current serving cell where the terminal is located The judgment result is earlier than the same frequency measurement threshold.

The measuring unit 403 is configured to measure the signal quality in the aggregated preferred cell layer according to the aggregated information of the aggregated preferred cell layer acquired by the acquiring unit 401 when the judging unit 402 judges that the signal quality of the serving cell is lower than the intra-frequency measurement threshold or the aggregated cell-specific threshold. The signal quality of the cell;

After obtaining the above judgment result, the terminal measures the signal quality of the cells in the aggregated preferred cell layer while measuring the signal quality of the same-frequency and high-priority cells, which can increase the possibility of the terminal reselecting to the aggregated cell.

The reselection unit 404 is configured to perform cell reselection according to the measurement result of the measurement unit 403 .

The terminal will calculate a result based on the measured cell signal quality and some offsets, sort the cells, and then select the cell with the best sorting result as the target cell for cell reselection.

The above-mentioned terminal may also include: a setting unit, configured to set the priorities of the cells in the aggregated preferred cell layer to the same priority;

The measuring unit 403 is configured to measure the signal quality of the aggregated cells with the same priority set by the setting unit in the aggregated preferred cell layer according to the aggregated information of the aggregated preferred cell layer acquired by the acquiring unit 401 .

The above-mentioned terminal can be used to implement a cell reselection method described in Embodiment 1 and Embodiment 2 of the present invention, but is not limited to implementing the method.

Referring to Figure 5, a terminal, including:

An information acquiring unit 501, configured to acquire the information of the aggregated carrier layer sent by the network side;

The comparison unit 502 is used to compare whether the signal quality of the serving carrier is lower than the same-frequency measurement threshold, or to compare whether the signal quality of the serving carrier is lower than the aggregated cell-specific threshold;

The signal measuring unit 503 is configured to measure the aggregated carrier according to the information of the aggregated carrier layer obtained by the information obtaining unit 501 when the signal quality of the serving carrier obtained by the comparing unit 502 is lower than the intra-frequency measurement threshold or the aggregated cell-specific threshold Layer signal quality;

The cell reselection unit 504 is configured to perform cell reselection according to the result measured by the signal measurement unit 503 .

Among them, the above-mentioned terminals also include:

an offset acquisition unit, configured to acquire an aggregated carrier layer-specific offset;

The above-mentioned cell reselection unit 504 is configured to perform cell reselection according to the measurement result of the signal measurement unit 503 and the dedicated offset acquired by the offset acquisition unit.

The above-mentioned terminal can be used to implement a cell reselection method described in Embodiment 3, but is not limited to implementing this method.

Referring to Figure 6, a communication system includes the following devices:

The network side 601 is configured to send aggregation information of the aggregation preferred cell layer to the terminal 602;

The terminal 602 is used to obtain the aggregation information of the aggregated preferred cell layer sent by the network side 601; when the signal quality of the current serving cell is lower than the intra-frequency measurement threshold or the aggregated cell-specific threshold, the aggregated preferred cell is measured according to the aggregated information of the aggregated preferred cell layer. The signal quality of the cell or carrier in the cell layer; cell reselection is performed according to the measured results.

Wherein, the above-mentioned network side 601 is also used to set the aggregated cell-specific offset for the cells or carriers in the aggregated preferred cell layer;

The terminal 602 is further configured to perform cell reselection according to the measurement result and the aggregated cell-specific offset set by the network side 601 .

Wherein, the terminal 602 is further configured to set the priorities of the cells or carriers in the aggregated preferred cell layer to the same priority.

The above communication system can be used to realize the method of cell reselection, but is not limited to realize the method.

Referring to Figure 7, a communication system includes:

The network side 701 is configured to send the aggregated carrier layer information to the terminal 702;

The terminal 702 is configured to obtain the information of the aggregated carrier layer sent by the network side 701; when the signal quality of the current serving carrier is lower than the intra-frequency measurement threshold or the aggregated cell-specific threshold, measure the aggregated carrier according to the information of the aggregated carrier layer Layer signal quality; perform cell reselection according to the measurement result.

Wherein, the terminal 702 is further configured to set a dedicated offset for the aggregated carrier layer.

In the embodiment of the present invention, when the signal quality of the serving cell is lower than the same-frequency measurement threshold or the aggregated cell-specific threshold, the signal quality of the cell in the aggregated preferred cell layer will be measured, and cell reselection is performed according to the measurement result, which can increase the terminal parking rate. The possibility of staying on the aggregated cell further reduces the probability of operations such as switching or redirection when the terminal needs to initiate high-speed services, thereby also reducing the probability of paging failure.

Further, setting the cells in the aggregated preferred cell layer to be the same priority and higher than the priority of neighboring cells can make the terminal preferentially measure the signal quality of the cells in the aggregated preferred cell layer, making it possible for the terminal to reselect to the aggregated cell sex increased further.

Further, the possibility of the terminal reselecting to the aggregated cell may be further increased by acquiring the aggregated cell-specific offset.

In the embodiments of the present invention, when the signal quality of the serving carrier is lower than the same-frequency measurement threshold or the aggregated cell-specific threshold, the signal quality of the aggregated carrier layer is measured, and cell reselection is performed according to the measurement results, which can increase the number of terminals that reside in the aggregated cell. This reduces the probability of operations such as switching or redirection when the terminal needs to initiate high-speed services, thereby reducing the probability of paging failure.

Those of ordinary skill in the art can understand that all or part of the steps in the methods of the above embodiments can be implemented by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed , including the following steps:

Obtain the aggregation information of the aggregation preferred cell layer sent by the network side;

When the signal quality of the serving cell is lower than the intra-frequency measurement threshold or the aggregated cell-specific threshold, measure the signal quality of the cells in the aggregated preferred cell layer according to the aggregated information of the aggregated preferred cell layer;

Cell reselection is performed according to the above measurement results.

The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, and the like.

A cell reselection method and terminal provided by the embodiments of the present invention have been described above in detail, and the descriptions of the above embodiments are only used to help understand the methods and ideas of the present invention; at the same time, for those skilled in the art, According to the idea of the present invention, there will be changes in the specific implementation and scope of application. To sum up, the contents of this specification should not be construed as limiting the present invention.

Claims (12)

1. a method of cell reselection is characterized in that, comprising:

Obtain the aggregation information of the aggregated preferable cell layer of network side transmission;

When the signal quality of Serving cell is lower than common frequency measurement threshold value or aggregation cell proprietary threshold, measure the signal quality of the sub-district in the described aggregated preferable cell layer according to the aggregation information of described aggregated preferable cell layer;

Result according to described measurement carries out the sub-district gravity treatment.

2. method of cell reselection according to claim 1 is characterized in that, further comprises:

The priority of the sub-district in the described aggregated preferable cell layer is set to identical priority; The signal quality that described aggregation information according to described aggregated preferable cell layer is measured the sub-district in the described aggregated preferable cell layer is specially:

Measure the signal quality of the aggregation cell in the described aggregated preferable cell layer with equal priority according to the aggregation information of described aggregated preferable cell layer.

3. method of cell reselection according to claim 2 is characterized in that, the priority of the sub-district in the described aggregated preferable cell layer is set to identical priority and is specially:

The priority of the sub-district in the described aggregated preferable cell layer is set to have in the described aggregated preferable cell layer priority that the priority of the priority of Long Term Evolution sub-district of limit priority or the sub-district in the described aggregated preferable cell layer is set to be higher than the priority of adjacent sub-district and is not higher than the sub-district of adjacent closed user group.

4. according to each described method of cell reselection of claim 1 to 3, it is characterized in that, further comprise:

Obtain the special-purpose amount of bias of aggregation cell of described aggregated preferable cell layer;

Described result according to described measurement carries out the sub-district gravity treatment and is specially:

Result and the special-purpose amount of bias of described aggregation cell according to described measurement are carried out the sub-district gravity treatment.

5. method of cell reselection according to claim 4 is characterized in that, the described special-purpose amount of bias of aggregation cell of obtaining aggregated preferable cell layer is by the arbitrary special-purpose amount of bias of described aggregation cell that obtains in system emulation or the radio resource management algorithms.

6. a method of cell reselection is characterized in that, comprising:

Obtain the information of the polymerization carrier wave layer of network side transmission;

When the signal quality of service carrier wave when being lower than common frequency measurement threshold value or aggregation cell proprietary threshold, according to the signal quality of the described polymerization carrier wave of the information measurement layer of described polymerization carrier wave layer;

Result according to described measurement carries out the sub-district gravity treatment.

7. method of cell reselection according to claim 6 is characterized in that, further comprises:

The priority of the carrier wave in the described polymerization carrier wave layer is set to identical priority;

The signal quality of the described described polymerization carrier wave of information measurement layer according to described polymerization carrier wave layer is specially:

Signal quality according to the carrier wave in the described polymerization carrier wave of the information measurement layer of described polymerization carrier wave layer with equal priority.

8. method of cell reselection according to claim 6 is characterized in that, further comprises:

Obtain the carrier-specific amount of bias of described polymerization carrier wave layer;

Described result according to described measurement carries out the sub-district gravity treatment and is specially:

Result and described special-purpose amount of bias according to described measurement are carried out the sub-district gravity treatment.

9. a terminal is characterized in that, comprising:

Acquiring unit is used to obtain the aggregation information of the aggregated preferable cell layer that network side sends;

Judging unit is used to judge whether the signal quality of Serving cell is lower than the common frequency measurement threshold value, or is used to judge whether the signal quality of Serving cell is lower than the aggregation cell proprietary threshold;

Measuring unit, be used for when the signal quality of described judgment unit judges Serving cell is lower than common frequency measurement threshold value or aggregation cell proprietary threshold, the aggregation information of the described aggregated preferable cell layer that gets access to according to described acquiring unit is measured the signal quality of the sub-district in the described aggregated preferable cell layer;

The gravity treatment unit is used for carrying out the sub-district gravity treatment according to the result that described measuring unit is measured.

10. terminal according to claim 9 is characterized in that, also comprises:

The unit is set, and the priority that is used for the sub-district of described aggregated preferable cell layer is set to identical priority;

The aggregation information that described measuring unit is used for the described aggregated preferable cell layer obtained according to described acquiring unit measure described aggregated preferable cell layer by the described signal quality that the aggregation cell with equal priority of unit setting is set.

11. a terminal is characterized in that, comprising:

Information acquisition unit is used to obtain the information of the polymerization carrier wave layer that network side sends;

Comparing unit, whether the signal quality that is used for relatively serving carrier wave is lower than the common frequency measurement threshold value, or whether the signal quality that is used for relatively serving carrier wave is lower than the aggregation cell proprietary threshold;

Signal measurement unit, the signal quality that is used for drawing the service carrier wave at described comparing unit is when being lower than common frequency measurement threshold value or aggregation cell proprietary threshold, the signal quality of the described polymerization carrier wave of the information measurement layer of the described polymerization carrier wave layer that obtains according to described information acquisition unit;

Gravity treatment unit, sub-district is used for carrying out the sub-district gravity treatment according to the result that described signal measurement unit is measured.

12. terminal according to claim 11 is characterized in that, also comprises:

The amount of bias acquiring unit is used to obtain the special-purpose amount of bias of described polymerization carrier wave layer;

Gravity treatment unit, described sub-district is used for the described special-purpose amount of bias that the result that measures according to described signal measurement unit and described amount of bias acquiring unit obtain and carries out the sub-district gravity treatment.

Images