WO2023098352A1 - Disconnection detection method, disconnection detection device, and storage medium - Google Patents

Abstract

Embodiments of the present disclosure relate to the field of mobile Internets, and provide a disconnection detection method, a disconnection detection device, and a storage medium. The method comprises: in the case that a core network receives a related signaling link establishment request from a terminal within a preset time before the abnormal terminal context release initiated by the terminal, determining that the terminal is disconnected from the network.

Description

Off-network detection method, off-network detection device and storage medium

Cross References to Related Applications

This disclosure claims priority to the Chinese patent application CN202111470425.5 filed on December 03, 2021, entitled "Off-network detection method, off-network detection device and storage medium", the entire content of which is incorporated into this disclosure by reference.

technical field

The present disclosure relates to the field of mobile Internet, and in particular to an off-network detection method, an off-network detection device and a storage medium.

Background technique

Abnormal disconnection of terminals has a great impact on user perception. Accurate identification of abnormal terminal disconnection helps to optimize the network and improve user perception. Therefore, identifying abnormal terminal disconnection has always been paid attention to.

Contents of the invention

The main purpose of the embodiments of the present disclosure is to provide an off-network detection method, an off-network detection device, and a storage medium.

In the first aspect, an embodiment of the present disclosure provides an off-network detection method, including: receiving a related signaling link establishment request from the terminal within a preset time before the core network initiates an abnormal terminal context release for the terminal In the case of , it is determined that the terminal is disconnected from the network.

In a second aspect, an embodiment of the present disclosure further provides an off-network detection device, the off-network detection device includes a processor, a memory, a computer program stored on the memory and executable by the processor, and used to implement A data bus connecting and communicating between the processor and the memory, wherein when the computer program is executed by the processor, the steps of any one of the off-network detection methods provided in this disclosure are implemented.

In a third aspect, an embodiment of the present disclosure further provides a storage medium for computer-readable storage, the storage medium stores one or more programs, and the one or more programs can be executed by one or more processors , so as to realize the steps of any offline detection method provided in the present disclosure.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present disclosure more clearly, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present disclosure. Ordinary technicians can also obtain other drawings based on these drawings on the premise of not paying creative work.

FIG. 1 is a schematic flow diagram of an off-network detection method provided by an embodiment of the present disclosure;

Fig. 2 is a schematic flow chart of the sub-steps of the off-grid detection method in Fig. 1;

FIG. 3a and FIG. 3b are schematic network diagrams of a terminal context release process provided by an embodiment of the present disclosure;

FIG. 4 is a schematic flowchart of applying the off-network detection method provided by the present disclosure in a 4G network according to Embodiment 1 of the present disclosure;

FIG. 5 is a schematic flowchart of applying the off-network detection method provided by the present disclosure in a 5G network according to Embodiment 2 of the present disclosure; and

Fig. 6 is a schematic structural block diagram of an off-network detection device provided by an embodiment of the present disclosure.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present disclosure with reference to the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are part of the embodiments of the present disclosure, not all of them. Based on the embodiments in the present disclosure, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present disclosure.

The flow charts shown in the drawings are just illustrations, and do not necessarily include all contents and operations/steps, nor must they be performed in the order described. For example, some operations/steps can be decomposed, combined or partly combined, so the actual order of execution may be changed according to the actual situation.

It should be understood that the terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. As used in this disclosure and the appended claims, the singular forms "a", "an" and "the" are intended to include plural referents unless the context clearly dictates otherwise.

The main reason for the abnormal disconnection of the terminal is the abnormality of the wireless link, so the abnormal disconnection of the terminal and the abnormality of the wireless link are often interchangeable. Since the 2G or 3G network is mainly for voice services, the terminal transmits continuously, and the terminal transmits continuously within a scheduling time. The quality of the uplink message can be used to accurately determine whether the terminal has been disconnected from the network. 4G, including the current 5G, is oriented to For packet data services, the time allocated for one scheduling is very short, which has caused the base station in 2G and 3G networks to detect off-network based on the quality of uplink transmission to fail in 4G and 5G. The relevant network optimization methods for 4G and 5G are all limited to the interior of the wireless network, and are limited by the base station, the function realization of the terminal and whether it is enabled or not. Therefore, there is an urgent need for an abnormal off-network detection method that does not depend on base stations and terminals.

The 2G or 3G network is mainly for voice services, and the terminal transmits continuously. The quality of the received uplink message can be detected on the base station side to accurately determine whether the terminal is off-net. Even for data services, the time allocated for one scheduling is relatively long, and the terminal sends continuously within one scheduling time. Therefore, the quality of uplink packets can also be used to accurately determine whether the terminal is offline. Therefore, in the 2/3G era, it is relatively easy to identify abnormal terminal disconnection.

However, since 4G, including the current 5G, is oriented to packet data services, the time for one scheduling allocation is very short, and the duration of one scheduling in 4G LTE (Long Time Evolution) network is only 1ms, and it also needs to be based on the actual data packet cache It is normal to not schedule for a long time, which leads to the failure of the off-network detection method for the base station to detect the uplink transmission quality in the 2/3G network.

In 4G LTE (Long Time Evolution) and 5G NR (New Radio), the terminal judges whether it is in an out-of-sync state by periodically detecting the quality of the downlink signal. 3GPP 36.213 4.2.1 defines that the terminal must perform periodic signal measurement, and report to the upper layer based on the signal quality whether it is in-sync (in-sync) or out-of-sync (out-of-sync) indication. If the number of consecutive out-of-synchronization status indications exceeds N310, it will enter the out-of-synchronization confirmation state. Turn on the timer T310, and during the effective period of T310, if the number of consecutive synchronization status indications exceeds N311, it is considered that the previous out-of-synchronization is a misjudgment. If after the T310 timer expires, there are no continuous N311 synchronization state indications, it is considered that the previous out-of-synchronization state judgment is correct, and the signal information of wireless link failure (or terminal off-network) is recorded. The base station configures three counters or timers N310, T310, and N311 to control the degree of difficulty for the terminal to detect air interface link failure. The meanings of these three counters or timers are: N310 represents the maximum number of continuous "out-of-synchronization state" indications, T310 represents the duration of confirming the out-of-synchronization state, and N311 represents the maximum number of continuous "synchronization state" indications exiting the failed state. The configuration of these parameters of the base station is broadcast to the terminal, for example, SIB2 (system message 2) in the LTE network includes:

"ue-TimersAndConstants

T300＝7(ms2000)

T301＝7(ms2000)

T310＝5(ms1000)

N310=7(n20)

T311=2(ms5000)

N311=0(n1)"

After the wireless link fails, the terminal will initiate a cell selection process to search for a new camping cell again. If a new resident cell is found within T311 and the security context is activated before the radio link failure occurs, the terminal will initiate an RRC (Radio Resource Control) reconstruction process to try to restore communication with the base station. If no new cell is found after the T311 timer expires, or the RRC re-establishment fails, or the security context is not activated when the link fails, the terminal will release the RRC connection and enter the idle (IDLE) state. The base station finds that the network quality is poor according to the frequency and density of the RRC re-establishment process, which is a means to optimize the wireless network. However, whether to initiate the RRC re-establishment process is limited by the time to find the new resident cell, and the new resident cell may be inconsistent with the cell where the radio link failed, which affects the judgment of poor network quality.

With the expansion of the network scale, the maintenance cost of the network is getting higher and higher. In order to reduce the maintenance cost of the network, SON (Self Organization Network, self-organizing network) is becoming more and more mature. SON includes radio link failure (RLF: Radio Link Failure), that is, the signal report when the terminal is off-line as reference information for wireless network optimization. After the terminal fails in the wireless link (or called off-network), when the terminal accesses the network again, it will send an indication bit to the base station.

The RRC re-establishment completion signaling, the RRC connection establishment completion signaling, and the RRC reconfiguration completion signaling all include the rlf-InfoAvailable flag bit. After discovering the rlf-InfoAvailable flag, the base station can initiate the ueInformationRequest/ueInformationResponse process to collect the signal information from the UE when the radio link fails, as auxiliary information for network optimization, thus providing a basis for network optimization based on radio link failure Rich information. However, this function is optional. The terminal may not support the collection and reporting of wireless link information, the base station may not support the extraction of wireless link information, or the wireless link information may not be processed after extraction.

The above network optimization methods are all limited to the interior of the wireless network, and are limited by the base station, the function realization of the terminal and whether it is enabled or not. If this function is not supported in the 5G NR R15 protocol, this function cannot be used. Therefore, there is an urgent need to provide a method for detecting terminal off-network that does not depend on the base station and the network.

Embodiments of the present disclosure provide an off-network detection method, an off-network detection device, and a storage medium. Wherein, the offline detection method can be applied to mobile terminals, and the mobile terminals can be electronic devices such as mobile phones, tablet computers, notebook computers, desktop computers, personal digital assistants and wearable devices.

Some embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

Please refer to FIG. 1 . FIG. 1 is a schematic flow chart of an off-network detection method provided by an embodiment of the present disclosure. The off-network detection method can be applied to off-network detection equipment.

As shown in FIG. 1 , the offline detection method includes step S101.

Step S101, if the core network receives a related signaling link establishment request from the terminal within a preset time before the release of the abnormal terminal context initiated by the terminal, determine that the terminal is offline.

The air interface link of the mobile Internet (including 4G LTE, 5G NR) is established on demand. When there is data to be sent but the air interface link has no RRC connection, a new RRC connection establishment request will be initiated. If the terminal T311 does not find a new resident cell after the timeout, or releases the RRC connection after RRC re-establishment fails, enters the IDLE state, and does not notify the base station, the base station is still in the RRC connection state, and the core network call control network element still considers that During communication. At this time, if the terminal has uplink data to send but finds that there is no RRC connection, the terminal will initiate an RRC establishment process to resume communication. The terminal communication link includes two parts, one part is the RRC connection between the terminal and the base station, and the other part is the terminal signaling-related link between the base station and the core network and an optional media plane tunnel connection. The last signaling rrcConnectionSetupComplete of the RRC connection establishment process between the terminal and the base station includes the NAS (Non-Access Stratum) signaling sent by the terminal to the core network call control network element, and the base station forwards this NAS signaling to the core network call control network element. Control network elements to establish terminal-related signaling links.

When the terminal releases the call without notifying the network, the maintenance status of the terminal and the network will be inconsistent. When the core network receives the NAS signaling request forwarded by the base station to establish a terminal-related signaling link, it will find that the corresponding terminal is still in the communication process. An abnormal terminal context release will be initiated. Therefore, if the network side receives a related signaling link establishment request sent by the base station from the same terminal within a short period of time before the release of the abnormal terminal context, it means that a call release that was not notified to the network side occurred before, that is, It indicates that the terminal was disconnected from the network before. Based on this point, the present disclosure realizes the discovery of air interface link failure or terminal off-network based on the signaling between the base station and the core network.

By judging whether the core network has received a relevant signaling link establishment request from the terminal within the preset time before initiating an abnormal terminal context release for the terminal, if the relevant signaling link establishment request from the terminal is received , it can be determined that the terminal has gone offline.

In one embodiment, referring to FIG. 2 , step S101 includes: sub-step S1011 to sub-step S1013.

Sub-step S1011, collect the signaling data of each interface around the core network call control network element, analyze the signaling data to generate XDR; wherein, the XDR includes at least: the record of the release of the terminal context initiated by the core network, the terminal identification, A record of the terminal's signaling link establishment request.

XDR (Extended Data Record) includes: CDR (Call Data Record) call detail record, TDR (Transaction Data Record) transaction detail record and SDR (Service Data Record) business detail record. Wherein, TDR is a basic session process record, which is used to describe a basic signaling process between two signaling points. The CDR is a signaling process that represents a relay call connection process. SDR is a record of the whole service process, which is used to describe the complete signaling coordination process that occurs when a user uses a network service.

Each interface around the core network call control network element includes: a first interface and a second interface, the first interface is the interface between the core network call control network element and the base station, and the second interface is the core network call control network element. An interface between a network element and other network elements of the core network, and the second interface carries a terminal identifier.

Exemplarily, for a 4G LTE network, the core network call control network element is an MME (Mobility Management Entity), and its surrounding interfaces include: the S1MME interface between the MME and the base station, and the S11 interface between the MME and the XGW. The S6a interface between the MME and the HSS, wherein the S11 interface carries the terminal identifier. Collect the original signaling data on each interface and analyze the signaling to generate XDR, such as the XDR definition in China Mobile's unified DPI specification.

Exemplarily, for a 5G NR network, the core network call control network element is AMF (Access and Mobility Management Function). The surrounding interfaces include: N2 interface between AMF and base station, N11 interface between AMF and SMF (Session Management Function), N12 interface between AMF and AUSF (Authentication Server Function), among them, N11 interface carries terminal logo. Collect the original signaling data on each interface and analyze the signaling to extract key information to generate XDR, such as the definition of XDR in China Mobile's 5G Internet Log Retention System Specification.

The interface between the core network call control network element and the base station generally does not carry a permanent identifier of the terminal, such as IMSI (International Mobile Subscriber Identity). However, the interface between the core network call control network element and other core network elements, such as the S11 or N11 interface, may carry the permanent user identification of the terminal. Through some common communication parameters between the two interfaces, such as the tunnel identifier TEID (Tunnel Endpoint Identifier) on the media plane between the base station and XGW, the terminal permanent user identifier of the S11/N11 interface belonging to the same session is used to backfill to XDR.

Based on the relevant signaling monitoring technology, the signaling data of each interface around the core network call control network element can be collected, and the signaling data can be analyzed according to the technical specifications of the industry to generate XDR. XDR extracts the key information of each piece of information belonging to the same signaling interaction process and saves it in the form of records.

Sub-step S1012, according to the XDR, screen out abnormal terminal context release records initiated by the core network.

UE Context Release includes three situations: a context release request initiated by the terminal, a context release initiated by the base station, and a context release initiated by the core network. As shown in FIG. 3 , it is a schematic diagram of a UE context release process initiated by a base station and a core network in an LTE network.

Among them, Fig. 3a shows that the base station eNB (evolved NodeB) sends a terminal context release request to the core network MME (Mobility Management Entity). Figure 3b shows the MME (Mobility Management Entity) of the core network sending a terminal context release command to the base station eNB. The terminal context release process initiated by the base station includes two parts a and b, that is, first the base station sends a terminal context release request to the core network, and then the core network sends a terminal context release command to the base station. However, the process of releasing the terminal context initiated by the core network only includes part b, and the core network directly sends a terminal context release command to the base station.

First, according to the analysis of XDR, all records of terminal context release initiated by the core network are screened out from the records, and abnormal terminal context release records are further screened out. The screening method is: according to the record of the terminal context release initiated by the core network including the reason for initiating the terminal context release, to exclude the terminal context release initiated by the core network due to normal service requirements.

The UE CONTEXT RELEASE COMMAND signaling sent by the core network contains the Cause field indicating the reason for initiating the context release.

For some business reasons, such as the completion of inter-station handover, the Cause carried by the terminal context on the release source base station side is Successful Handover (successful handover), Handover Canceled (cancel handover). For these application scenarios, there is a corresponding call flow switching process cooperation, which is a normal business requirement. Therefore, after excluding the case where the core network initiates the release of the terminal context based on normal services based on the reasons, the remaining records are the abnormal terminal context release records.

Since the reason for the context release corresponding to most services initiated by the core network is Successful Handover or Handover Cancelled, although there are still a few other scenarios where the context release of the terminal is initiated by the core network, most of the normal context release records are excluded through the exclusion method for the next step of judgment.

When it is determined that the reason for initiating the release of the terminal context is not any one of Successful Handover or Handover Cancelled, the release of the terminal context initiated by the core network is an abnormal terminal context release. Further, it is also necessary to judge whether the same terminal has a signaling link establishment request.

Sub-step S1013, according to the release time of each abnormal terminal context release record and the terminal identification of the targeted terminal, when within the preset time before the release time, it is determined that there is an error message from the same terminal When the relevant signaling link establishment request is made, it can be determined that the terminal is disconnected from the network.

Starting from the time when the core network initiates the release of the abnormal terminal context, search forward for a preset period of time. If there is a related signaling link establishment request for the same terminal sent by the base station within this preset period of time, it means that the terminal has previously A disconnection has occurred.

Further, according to the corresponding base station information in the abnormal terminal context release record, determine the base station where the terminal is abnormally disconnected from the network, and according to the cell information contained in the terminal-related signaling link establishment request sent by the base station to the core network, determine the disconnection The terminal re-connects to the new camping cell of the network.

Since the core network detects that there is a legacy terminal context for the same terminal after receiving the terminal-related signaling link establishment request sent by the base station, the abnormal release is initiated, and the interval between them should be very short. Therefore, the preset time is generally not If it exceeds 100 milliseconds, the value is determined according to different services of the network, which is not limited in the present disclosure.

Exemplarily, the preset time may be set to 30 milliseconds.

The off-network detection method provided by the present disclosure can detect the off-network situation based on the signaling between the base station and the core network, so it is not limited by the functions of the base station, network and terminal, has good versatility, and can be used in a wide range. It has been used for a long time to detect the scene where the terminal is abnormally disconnected from the network in the wireless network, which improves the efficiency of finding poor wireless network quality, and can provide basis and auxiliary information for wireless network optimization and user experience improvement.

In order to better illustrate the off-network detection method provided by the present disclosure, the present disclosure also provides an embodiment of applying the method to a network.

Embodiment one

As shown in FIG. 4, the method of the present disclosure is applied to detect off-network conditions in a 4G LTE network, and the entire processing flow is divided into four steps.

For 4G LTE networks, the core network call control network element is MME (Mobility Management Entity).

Step 1: collect the original signaling of each interface around the MME, and extract key information to generate an XDR.

The interfaces around the MME include the S1MME interface between the MME and the base station, the S11 interface between the MME and the XGW, and the S6a interface between the MME and the HSS. Collect the original signaling data on each interface and analyze the signaling to generate XDR, such as the XDR definition in China Mobile's unified DPI specification. Step 1 can be completed based on a common signaling monitoring and collection platform.

XDR extracts the key information of each piece of information belonging to the same signaling interaction process and saves it in the form of records. For example, the call process of 4G S1MME interface includes:

1: Attach

2: Service request

3: Extended service request

4: Paging

5: TAU

6: Detach

7: PDN connectivity

8: PDN disconnection

9: EPS bearer resource allocation

10: EPS bearer resource modification

11: EPS bearer context deactivation

12: EPS bearer context modification

13: Dedicated EPS bearer context activation

14: X2 handover

15: S1 handover in

16: S1 handover out

17: S1 handover cancel

18: Initial context setup

19: UE context modification

20: UE context release

21: E-RAB release

22: Reset

23: Error indication

The XDR record corresponding to the 4G network is as follows:

Step 2: Backfill the permanent identifier of the terminal for XDR.

The interface between the MME and the base station generally does not carry a permanent identifier of the terminal, such as IMSI (International Mobile Subscriber Identity). However, the interface between the MME and other network elements of the core network, such as the S11 interface, can carry the permanent user identification of the terminal. Through some common communication parameters between the two interfaces, such as the tunnel identifier TEID (Tunnel Endpoint Identifier) on the media plane between the base station and XGW, backfill the terminal permanent user identifier of the S11 interface belonging to the same session to the XDR of the S1 interface middle. Each XDR in the S1 interface is identified according to the S1APID and other labels to combine the XDRs belonging to the same call. The terminal permanent identification determined from some XDRs within the same call can be extended to all XDRs of the same call. Since the collection part of the signaling monitoring platform usually includes the backfill function of the terminal permanent identification, the synthesis server of the signaling monitoring platform completes the second step.

Step 3: Analyze the XDR, and filter out records of abnormal terminal context release initiated by the core network.

According to the analysis of XDR, the abnormal terminal context release records that need to be generated for abnormal services initiated by the core network are selected.

The release of the terminal context can be initiated by the base station or by the core network. The terminal context release initiated by the base station is that the base station first sends a request message to the core, and then the core network sends a terminal context release signaling to the base station. The release of the terminal context initiated by the core network means that the core network directly sends the signaling of the release of the terminal context to the base station.

The cause field included in the UE CONTEXT RELEASE COMMAND signaling sent by the core network gives the reason for initiating the release. For some reasons, for example, when the handover between stations is completed, the cause carried by the terminal context on the release source base station side is Successful Handover, the handover between stations fails, and the terminal context on the target base station side is released as Handover Canceled, and the corresponding process cooperation is required for normal business. Excluding the case of releasing the terminal context required by the normal business of the core network according to the cause value, the remaining release records required by the abnormal business.

Step 4: Judging whether the core network has received a related signaling link establishment request from the same terminal within a preset time before initiating the context release of the abnormal terminal, so as to determine whether the terminal is disconnected from the network.

It can be judged that the terminal is abnormally disconnected from the network by filtering out the record that the core network has received the related signaling link establishment request from the same terminal initiated by the base station within the preset time before initiating the context release of the abnormal terminal.

Considering that the abnormal release is initiated by the core network after it detects the existence of the legacy terminal context after receiving the terminal-related signaling link establishment request sent by the base station, the time interval between the two is very short. For example, the preset time can be set to 30ms .

The base station sends the terminal-related signaling link establishment request to carry the NAS signaling received from the terminal, generally Service Request, 4G TAU (Tracking Area Updating), 4G ATTACH request. Therefore, the base station where the terminal is abnormally disconnected from the network can be determined according to the base station corresponding to the abnormal terminal context release record initiated by the core network, and the cell corresponding to the terminal-related signaling link establishment request sent by the base station is the terminal re-accessing the network new residence area.

The off-network detection method provided by the embodiments of the present disclosure can detect the off-network situation of the 4G network based on the signaling between the base station and the core network, and is not limited by the functions of the base station, network, and terminal, and has good versatility. It can be used in a wide range and for a long time to detect the scene where the terminal is abnormally disconnected from the network in the wireless network. It can improve the efficiency of finding poor wireless network quality, and provide basis and auxiliary information for wireless network optimization and user experience improvement.

Embodiment two

As shown in Figure 5, the method disclosed in the present disclosure is applied to detect off-network conditions in a 5G NR network, and the entire processing flow is divided into four steps.

For 5G NR networks, the core network call control network element is AMF (Access and Mobility Management Function).

Step 1: Collect the original signaling of each interface around the AMF, and extract key information to generate XDR.

The interfaces around the AMF include the N2 interface between the AMF and the base station, and the N11 interface between the AMF and the SMF (Session Management Function). N12 interface between AMF and AUSF (Authentication Server Function). Collect the original signaling on each interface and analyze the signaling to generate XDR, such as the XDR definition in China Mobile's 5G Internet Log Retention System Specification.

XDR extracts the key information of each piece of information belonging to the same signaling interaction process and saves it in the form of records. For example, the call process of 5G N1N2 interface includes:

Registration

De-registration

Service Request

Paging

Notification

Primary Authentication

Security Activation

Identification Acquisition

UE Configuration Update

5GMM Status

PDU Session Establishment

Secondary Authentication

PDU Session Modification

PDU Session Release

5GSM Status

N2 HO Out

N2 HO In

N2 HO Cancel

Xn HO

Initial Context Setup

UE Context Modification

UE Context Release

PDU Session Resource Setup

PDU Session Resource Modify

Usually, the collection platform for signaling monitoring can complete this step.

PDU Session Resource Release

PDU Session Resource Notify

PDU Session Resource Modify Indication

SMS

UE Capability Info Indication

The generated XDR records are as follows:

Step 2: Backfill the permanent identifier of the terminal for XDR.

The interface between the AMF and the base station generally does not carry the permanent identification of the terminal, such as IMSI (International Mobile Subscriber Identity). However, the interface between the call control network element of the core network and other network elements of the core network, such as the N11 interface, may carry the permanent user identification of the terminal. Through some common communication parameters between the two interfaces, such as the tunnel identifier TEID (Tunnel Endpoint Identifier) on the media plane between the base station and XGW, backfill the terminal permanent user identifier of the N11 interface belonging to the same session to the S1/N2 interface in the XDR. Each XDR in the N2 interface is identified according to the NgAPID and other labels to combine the XDRs belonging to the same call. The terminal permanent identification determined from some XDRs within the same call can be extended to all XDRs of the same call. The collection part of the signaling monitoring platform usually includes the backfill function of the permanent identification of the terminal. Usually done by compositing servers.

Step 3: Analyze the XDR, and filter out records of abnormal terminal context release initiated by the core network.

The release of the terminal context can be initiated by the base station or by the core network. The terminal context release initiated by the base station is that the base station first sends a request message to the core, and then the core network sends a terminal context release signaling to the base station. The release of the terminal context initiated by the core network means that the core network directly sends the signaling of the release of the terminal context to the base station.

The cause field included in the UE CONTEXT RELEASE COMMAND signaling sent by the core network gives the reason for initiating the release. For some reasons, such as the completion of inter-station handover, release the Cause carried by the terminal context on the source base station side is Successful Handover, if the inter-station handover fails, release the terminal context Handover Canceled on the target base station side. According to the cause value, the remaining abnormal release records are excluded when the core network normally releases the terminal context.

Step 4: Judging whether the core network has received a related signaling link establishment request from the same terminal within a preset time before initiating the context release of the abnormal terminal, so as to determine whether the terminal is disconnected from the network.

Since the core network detects the existence of the legacy terminal context and initiates the abnormal release after receiving the terminal-related signaling link establishment request sent by the base station, this time should be very short and should not exceed 100ms. It is recommended to choose 30ms.

The base station sends the terminal-related signaling link establishment request to carry the NAS signaling received from the terminal, which is generally Service Request, 5G Registration. The base station corresponding to releasing the terminal context is the base station where the terminal is abnormally disconnected from the network, and the cell where the base station sends the terminal-related signaling link establishment request is the new resident cell where the terminal reconnects to the network.

The off-network detection method provided by the embodiments of the present disclosure can detect the off-network situation of the 5G network based on the signaling between the base station and the core network, and is not limited by the functions of the base station, network, and terminal, and has good versatility. It can be used in a wide range and for a long time to detect the scene where the terminal is abnormally disconnected from the network in the wireless network. It can improve the efficiency of finding poor wireless network quality, and provide basis and auxiliary information for wireless network optimization and user experience improvement.

Please refer to FIG. 6 . FIG. 6 is a schematic structural block diagram of an off-network detection device provided by an embodiment of the present disclosure.

As shown in FIG. 6 , the offline detection device 300 includes a processor 301 and a memory 302, and the processor 301 and the memory 302 are connected through a bus 303, such as an I2C (Inter-integrated Circuit) bus.

The processor 301 is used to provide computing and control capabilities to support the operation of the entire offline detection device. The processor 301 can be a central processing unit (Central Processing Unit, CPU), and the processor 301 can also be other general processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC) ), Field-Programmable Gate Array (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Wherein, the general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory 302 can be a Flash chip, a read-only memory (ROM, Read-Only Memory) disk, an optical disk, a U disk, or a mobile hard disk.

Those skilled in the art can understand that the structure shown in Figure 6 is only a block diagram of a partial structure related to the embodiment of the present disclosure, and does not constitute a limitation on the off-network detection device to which the embodiment of the present disclosure is applied. , the server may include more or fewer components than shown in the figures, or combine certain components, or have a different arrangement of components.

Wherein, the processor is configured to run a computer program stored in the memory, and implement any one of the off-network detection methods provided in the embodiments of the present disclosure when the computer program is executed.

In one embodiment, the processor is configured to run a computer program stored in a memory, and implement the following steps when executing the computer program:

If the core network receives a related signaling link establishment request from the terminal within a preset time before initiating an abnormal terminal context release for the terminal, it determines that the terminal is disconnected from the network.

In one embodiment, when the processor implements the offline detection method, it is configured to: obtain the abnormal terminal context release record initiated by the core network; according to the release time of each abnormal terminal context release record and For the terminal identifier of the terminal, when it is determined that there is a related signaling link establishment request from the same terminal within the preset time before the release time, it is determined that the terminal is offline.

In an embodiment, when the processor obtains the abnormal terminal context release record initiated by the core network, it is used to: collect signaling data of interfaces around the call control network element of the core network, and analyze the signaling data. Make the data generate XDR; wherein, the XDR includes at least: the record of the terminal context release initiated by the core network, the terminal identifier, and the record of the relevant signaling link establishment request of the terminal; Initiated exception terminal context release records.

In an embodiment, when the processor screens out abnormal terminal context release records initiated by the core network according to the XDR, the processor is configured to: include in the record of the terminal context release initiated by the core network An indication of the reason for initiating the release of the terminal context; when it is determined that the cause indication is not either Successful Handover or Handover Cancelled, the release of the terminal context initiated by the core network is an abnormal terminal context release.

In one embodiment, the surrounding interfaces include: a first interface and a second interface, the first interface is the interface between the core network call control network element and the base station, and the second interface is the interface between the core network The interface between the call control network element and other network elements of the core network, and the second interface carries the terminal identifier; when the processor implements parsing the signaling data to generate XDR, it is used to implement: according to the parsing The XDR is generated from the analysis result obtained from the signaling data of the first interface and the terminal identifier obtained from the parameters of the second interface.

In an embodiment, when the processor implements the off-network detection method, it is used to implement: for a 4G network, the core network call control network element is an MME, and the first interface is between the MME and the base station The S1MME interface; the second interface is an S11 interface between the MME and the XGW, where the S11 interface carries the terminal identifier.

In an embodiment, when the processor implements the off-network detection method, it is used to implement: for a 5G network, the core network call control network element is an AMF, and the first interface is the AMF and the base station An N2 interface between them; the second interface is an N11 interface between the AMF and the SMF, where the N11 interface carries the terminal identifier.

In an embodiment, when the processor implements the offline detection method, it is configured to implement: after determining that the terminal is offline, according to the abnormal terminal context release initiated by the core network for the terminal, The base station information of the base station is determined to determine the base station that has been disconnected from the network; according to the cell information corresponding to the relevant signaling link establishment request from the terminal, the new camping cell of the terminal re-accessing the network is determined.

It should be noted that those skilled in the art can clearly understand that for the convenience and brevity of description, the working process of the above-described offline detection device can refer to the corresponding process in the aforementioned embodiment of the offline detection method. No longer.

An embodiment of the present disclosure also provides a storage medium for computer-readable storage, the storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to implement the following: The steps of any one of the off-network detection methods provided in the description of the embodiments of the present disclosure.

Wherein, the storage medium may be an internal storage unit of the off-network detection device described in the foregoing embodiments, such as a hard disk or a memory of the off-network detection device. The storage medium can also be an external storage device of the off-network detection device, such as a plug-in hard disk equipped on the off-network detection device, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, flash memory card (Flash Card), etc.

Embodiments of the present disclosure provide an off-network detection method, an off-network detection device, and a storage medium. The off-network detection method provided by the embodiments of the present disclosure does not rely on the data provided by the base station to find out the poor quality of the off-network in the wireless network. Based on the signaling between the base station and the core network to detect the off-network situation, so it is not limited by the functions of the base station, network and terminal, has good versatility, and can be used in a wide range and for a long time to detect terminal occurrences in the wireless network The scene of abnormal disconnection improves the efficiency of finding poor wireless network quality, and can provide basis and auxiliary information for wireless network optimization and user experience improvement.

Those of ordinary skill in the art can understand that all or some of the steps in the methods disclosed above, the functional modules/units in the system, and the device can be implemented as software, firmware, hardware, and an appropriate combination thereof. In hardware embodiments, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be composed of several physical components. Components cooperate to execute. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit . Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). As known to those of ordinary skill in the art, the term computer storage media includes both volatile and nonvolatile media implemented in any method or technology for storage of information, such as computer readable instructions, data structures, program modules, or other data. permanent, removable and non-removable media. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cartridges, tape, magnetic disk storage or other magnetic storage devices, or can Any other medium used to store desired information and which can be accessed by a computer. In addition, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media .

It should be understood that the term "and/or" used in the present disclosure and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. It should be noted that, as used herein, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or system comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or system. Without further limitations, an element defined by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article or system comprising that element.

The serial numbers of the above-mentioned embodiments of the present disclosure are for description only, and do not represent the advantages and disadvantages of the embodiments. The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art can easily think of various equivalents within the technical scope of the present disclosure. Modifications or replacements should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be determined by the protection scope of the claims.

Claims (10)

An off-net detection method, comprising: When the core network receives a related signaling link establishment request from the terminal within a preset time before initiating an abnormal terminal context release for the terminal, it is determined that the terminal is disconnected from the network. The offline detection method according to claim 1, further comprising: Obtaining a record of abnormal terminal context release initiated by the core network; and According to the release time of each abnormal terminal context release record and the terminal identifier of the targeted terminal, within the preset time before the release time, determine that there is a related signaling chain from the same terminal In the case of a path establishment request, it is determined that the terminal is disconnected from the network. The off-network detection method according to claim 2, wherein said obtaining the abnormal terminal context release record initiated by the core network comprises: Collect the signaling data of each interface around the core network call control network element, analyze the signaling data to generate XDR; wherein, the XDR includes at least: the record of the release of the terminal context initiated by the core network, the terminal identification, and the relevant information of the terminal make a record of the link establishment request; and Screening out abnormal terminal context release records initiated by the core network according to the XDR. The off-network detection method according to claim 3, wherein the screening out the abnormal terminal context release record initiated by the core network according to the XDR includes: According to the indication of the reason for initiating the release of the terminal context contained in the record of the release of the terminal context initiated by the core network; and In a case where it is determined that the cause indication is not any one of successful handover or canceled handover, it is determined that the release of the terminal context initiated by the core network is an abnormal release of the terminal context. The offline detection method according to claim 3, wherein, The surrounding interfaces include: a first interface and a second interface, the first interface is the interface between the core network call control network element and the base station, and the second interface is the interface between the core network call control network element and the core an interface between other network elements in the network, and the second interface carries the terminal identifier; The analyzing the signaling data to generate XDR includes: The XDR is generated according to the analysis result obtained by analyzing the signaling data of the first interface and the terminal identifier obtained from the parameters of the second interface. The off-network detection method according to claim 5, wherein, for a 4G network, the core network call control network element is an MME, and the first interface is an S1MME interface between the MME and the base station; the second The interface is an S11 interface between the MME and the XGW, wherein the S11 interface carries the terminal identifier. The off-network detection method according to claim 5, wherein, for a 5G network, the core network call control network element is an AMF, and the first interface is an N2 interface between the AMF and the base station; the The second interface is an N11 interface between the AMF and the SMF, where the N11 interface carries the terminal identifier. The off-network detection method according to any one of claims 1-7, wherein, after determining that the terminal is off-network, further comprising: Determine the base station that has gone offline according to the base station information corresponding to the abnormal terminal context release initiated by the terminal by the core network; and According to the cell information corresponding to the relevant signaling link establishment request from the terminal, determine the new camping cell where the terminal re-accesses the network. An off-network detection device, the off-network detection device includes a processor, a memory, a computer program stored on the memory and executable by the processor, and used to realize the communication between the processor and the memory A data bus connected for communication, wherein when the computer program is executed by the processor, the steps of the off-network detection method according to any one of claims 1 to 8 are realized. A storage medium for computer-readable storage, the storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to implement any one of claims 1 to 8 A step of the off-grid detection method described in one item.

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