CN112637912B

CN112637912B - Method, device and system for interoperation between different access network devices

Info

Publication number: CN112637912B
Application number: CN201910907009.3A
Authority: CN
Inventors: 程严; 李明; 吕玖有; 罗茜; 唐发建
Original assignee: Shanghai Huawei Technologies Co Ltd
Current assignee: Shanghai Huawei Technologies Co Ltd
Priority date: 2019-09-24
Filing date: 2019-09-24
Publication date: 2021-10-22
Anticipated expiration: 2039-09-24
Also published as: CN112637912A; WO2021057770A1

Abstract

The embodiment of the application discloses a method, a device and a system for interoperating different access network devices, wherein the method comprises the following steps: the first access network equipment establishes a first connection with the target terminal equipment; the first access network equipment responds to a voice service initiated by the target terminal equipment to construct a first virtual grid facing the 3G cell, and at the moment, the voice service is switched from the 5G network to the 3G network; when the voice service is finished at the 3G network side, the third access network equipment sends a switching request message to the second access network equipment, the second access network equipment responds to the switching request message, a second virtual grid facing the 5G cell is constructed by the second access network equipment, and the first access network equipment reestablishes a second connection with the target terminal equipment. In the embodiment of the application, the first access network device reduces access delay by constructing the first virtual grid facing the 3G cell, and the second access network device reduces return delay by constructing the second virtual grid facing the 5G cell, so that the use experience of a user is improved.

Description

Method, device and system for interoperation between different access network devices

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method, an apparatus, and a system for performing interoperation between different access network devices.

Background

Currently, two networking modes are defined by New Radio (NR) on the standard, namely, stand-alone networking (SA) and Non-stand-alone Networking (NSA).

In an SA scenario, if a terminal device (the terminal device is a terminal device supporting a 5G network) has a voice service, the terminal device can carry the voice service in three ways: in the method 1, if NR deploys VONR, the Voice service is established at NR, and since the frequency band adopted by NR is higher (C-band or above), the overall coverage of a cell is limited, it is difficult to form continuous coverage at the initial stage of NR network establishment, and thus the coverage Continuity and signal quality are weaker than those of the existing LTE network and UMTS network, if NR coverage is limited (i.e. when the coverage is weak), the terminal device may switch to a 3G network (supported by R16 standard) to initiate Voice service by switching to VoLTE of a 4G network or by Single Radio Voice Call Continuity (SRVCC); in the mode 2, if the NR is not deployed with the VONR and the LTE network is deployed with the VOLTE, at this time, the terminal device may drop back to the 4G network to initiate a voice service in an Evolved Packet System Fallback (EPS FB) mode; in the mode 3, if the NR is not deployed with the VONR and the LTE network is not deployed with the VOLTE, the terminal device first falls back to the 4G network in an EPS FB manner, then falls back to the 3G/2G network in a Circuit Switched Fallback (CSFB) manner, and finally the terminal device initiates a voice service in the 3G/2G network.

However, in the above-mentioned method 1, if the terminal device is handed over to the 3G network through the SRVCC method, the access delay of the handover method is about 2 seconds, and in the above-mentioned method 3, the terminal device falls back to the 4G network through the EPS FB method and then falls back to the 3G/2G network through the CSFB method, and the total access delay of the handover method is about 8 seconds. Both of the two switching modes have large access delay; in addition, in the mode 1 and the mode 3, after the terminal device finishes switching the voice service from the 3G network to the 4G network, the access network device on the 4G network side cannot perceive that the terminal device is a terminal device supporting the 5G network, and then the access network device on the 4G network side does not perform switching or redirection from the 4G network to the 5G network on the terminal device, and the terminal device can only return to the 5G network by the user in the idle state in a reselection manner, at this time, the return time delay of the terminal device returning to the 5G network is about 8 seconds, if the terminal device also has a PS service, the terminal device needs to wait for the terminal device to return to the idle state after the PS service is finished to perform reselection operation by the user, and at this time, the terminal device may hang up on the 4G network side for a long time, which results in a longer return time delay.

Disclosure of Invention

The embodiment of the invention provides a method, a device and a system for interoperating different access network devices, which are used for reducing the access delay of a terminal device switched from a 5G network to a 3G network and reducing the return delay of the terminal device returned from a 4G network to the 5G network, so that the use experience of a user is improved.

In view of this, a first aspect of the embodiments of the present application provides a method for performing an interoperation between different access network devices, including: the first access network equipment establishes a first connection with the target terminal equipment; if the NR network deploys VONR, the first access network equipment responds to the voice service initiated by the target terminal equipment; in response to a trigger instruction, the first access network equipment builds a first virtual grid facing a 3G cell, and disconnects the first connection, so that the voice service is returned to the 3G network from the 5G network based on the first virtual grid; when the voice service is finished, the first access network device reestablishes a second connection with the target terminal device, the second connection is triggered by a second virtual grid which is constructed by a second access network device and faces a 5G cell, the step of constructing the cell which faces the 5G cell by the second access network device is triggered by a switching request message which is sent to the second access network device by a third access network device, the switching request message is used for indicating that the target terminal device is switched from the 3G network to a 4G network, the switching request message carries private information, and the private information is used for indicating that the target terminal device is a terminal device which supports the 5G network.

In the embodiment of the present application, the first access network device reduces the access delay by constructing the first virtual grid facing the 3G cell, that is, the voice service of the target terminal device is directly switched from the 5G network to the 3G network (for example, by the SRVCC method) based on the constructed first virtual grid, and the second access network device reduces the return delay by constructing the second virtual grid facing the 5G cell again, so that the total time delay of the interoperation between different access network devices is reduced, and the use experience of the user is improved.

With reference to the first aspect of the embodiment of the present application, in a first implementation manner of the first aspect of the embodiment of the present application, the trigger instruction includes: the signal quality of the 5G network in the area where the target terminal device is located is weaker than that of the 3G network, and VOLTE is not deployed in the LTE network.

With reference to the first aspect of the embodiment of the present application and the first implementation manner of the first aspect of the embodiment of the present application, in a second implementation manner of the first aspect of the embodiment of the present application, the constructing, by the first access network device, a first virtual grid facing a 3G cell includes: the first access network equipment acquires an MR which is reported periodically, the MR is obtained by the target terminal equipment through the measurement of the same frequency period, and the MR comprises an RSRP value of the 3G cell; the first access network equipment segments the RSRP value to obtain each RSRP segment number, RSRP interval values respectively corresponding to each RSRP segment number and cell IDs of 3G cells respectively corresponding to each RSRP segment number; the first access network equipment counts the number of attempts and the number of failures of any terminal equipment which establishes connection with the first access network equipment to switch from the 5G network to the 3G network within a preset time interval; and the first access network equipment constructs a first virtual raster list according to the RSRP segment numbers, the cell IDs, the trial times and the failure times.

In the above embodiments of the present application, a process of how the first access network device constructs the first virtual grid is specifically described, and specific operability is described.

In combination with the second implementation manner of the first aspect of the example embodiments of the present application, in a third implementation manner of the first aspect of the example embodiments of the present application, the method further includes: and the first access network equipment updates the first virtual raster list according to a preset period, so that the data of the first virtual raster list is more accurate.

With reference to the second implementation manner of the first aspect of the embodiment of the present application and the third implementation manner of the first aspect of the embodiment of the present application, in the fourth implementation manner of the first aspect of the embodiment of the present application, the returning, by the 5G network, the voice service to the 3G network based on the first virtual grid may include: the first access network equipment determines a target RSRP segment number and a first target grid in the first virtual grid list corresponding to a target cell ID according to the obtained target MR of the current period, wherein the first target grid comprises the target RSRP segment number, the target cell ID, the attempt times and the failure times; the first access network equipment judges the type of the first target grid; and if the first access network equipment determines that the type of the first target grid is the first type, returning the voice service from the 5G network to the 3G network in a blind mode.

In the above embodiments of the present application, how to return the voice service of the target terminal device from the 5G network to the 3G network in a blind manner is specifically described, which is specifically applicable.

With reference to the fourth implementation manner of the first aspect of the present application, in a fifth implementation manner of the first aspect of the present application, if the first access network device determines that the type of the first target grid is the second type, the first access network device determines whether a historical voice service is returned to the 3G network from the 5G network in a blind manner; if yes, the voice service is returned to the 3G network from the 5G network in a blind mode; and if not, returning the voice service to the 3G network from the 5G network according to a measuring mode.

With reference to the fourth implementation manner of the first aspect of the present application and the fifth implementation manner of the first aspect of the present application, in a sixth implementation manner of the first aspect of the present application, if the first access network device determines that the type of the first target grid is the third type, the voice service performs handover in a preset manner.

In the above embodiments of the present application, how to switch the voice service initiated by the target terminal device according to the different types of the first virtual grids when the first virtual grids are of different types is respectively described, so that the flexibility is provided, and the effectiveness of each switching process is improved.

A second aspect of the present application further provides a method for performing interoperation between different access network devices, including:

when the voice service is finished, the second access network equipment acquires a switching request message sent by the third access network equipment, wherein the switching request message is used for indicating that the target terminal equipment is switched from a 3G network to a 4G network, the switching request message carries private information, the private information is used for indicating that the target terminal equipment is terminal equipment supporting a 5G network, the voice service is returned to the 3G network from the 5G network based on a first virtual grid, and the first virtual grid is constructed by the first access network equipment facing a 3G cell in response to a trigger instruction; the second access network equipment identifies the target terminal equipment as the terminal equipment supporting the 5G network according to the private information; and the second access network equipment constructs a second virtual grid facing the 5G cell, so that the target terminal equipment is switched from the 4G network to the 5G network based on the second virtual grid.

With reference to the second aspect of the embodiment of the present application, in a first implementation manner of the second aspect of the embodiment of the present application, the triggering instruction may include: the signal quality of the 5G network in the area where the target terminal device is located is weaker than that of the 3G network, and VOLTE is not deployed in the LTE network.

With reference to the second aspect of the present application and the first implementation manner of the second aspect of the present application, in the second implementation manner of the second aspect of the present application, the constructing, by the second access network device, the second virtual grid facing the 5G cell may include: the second access network equipment acquires an MR which is reported periodically, the MR is obtained by the target terminal equipment through the measurement of the same frequency period, and the MR comprises an RSRP value of the 5G cell; the second access network equipment segments the RSRP value to obtain each RSRP segment number, RSRP interval values respectively corresponding to each RSRP segment number and cell IDs of the 5G cells respectively corresponding to each RSRP segment number; the second access network equipment counts the number of attempts and the number of failures of any terminal equipment which establishes connection with the second access network equipment to switch from the 4G network to the 5G network within a preset time interval; and the second access network equipment constructs a second virtual raster list according to the RSRP segment numbers, the cell IDs, the trial times and the failure times.

In the above embodiments of the present application, a process of how the second access network device constructs the second virtual grid is specifically described, and specific operability is described.

In combination with the second implementation manner of the second aspect of the example embodiments of the present application, in a third implementation manner of the second aspect of the example embodiments of the present application, the method further includes: and the second access network equipment updates the second virtual raster list according to a preset period. Thereby making the data of the first virtual grid list more accurate.

With reference to the second implementation manner of the second aspect of the embodiment of the present application and the third implementation manner of the second aspect of the embodiment of the present application, in a fourth implementation manner of the second aspect of the embodiment of the present application, the switching, by the target terminal device, from the 4G network to the 5G network based on the second virtual grid may include: the second access network device determines a target RSRP segment number and a second target grid in the second virtual grid list corresponding to a target cell ID according to the obtained target MR of the current period, wherein the second target grid comprises the target RSRP segment number, the target cell ID, the attempt times and the failure times; the second access network equipment judges the type of the second target grid; and if the second access network equipment determines that the type of the second target grid is the first type, the target terminal equipment is switched from the 4G network to the 5G network in a blind mode.

In the above embodiments of the present application, a specific applicability that the target terminal device is switched from the 4G network to the 5G network in a blind manner is specifically set forth.

With reference to the fourth implementation manner of the second aspect of the present application, in a fifth implementation manner of the second aspect of the present application, if the second access network device determines that the type of the second target grid is the second type, the second access network device determines whether a historical handover form of any terminal device that establishes a connection with the second access network device is switched from the 4G network to the 5G network in a blind manner; if yes, the target terminal equipment is switched from the 4G network to the 5G network in a blind mode; and if not, the target terminal equipment is switched from the 4G network to the 5G network according to a measuring mode.

With reference to the fourth implementation manner of the second aspect of the present application and the fifth implementation manner of the second aspect of the present application, in a sixth implementation manner of the second aspect of the present application, if the second access network device determines that the type of the second target grid is the third type, the target device performs handover in a preset manner.

In the above embodiments of the present application, how to switch the target terminal device according to different types of the second virtual grids when the second virtual grids are of different types is respectively described, so that the method has flexibility, and improves the effectiveness of each switching process.

A third aspect of the present application provides a method for performing interoperation between different access network devices, including: the first access network equipment establishes a first connection with the target terminal equipment; if the NR network does not deploy VONR and the LTE network does not deploy VOLTE, when the target terminal device initiates a voice service, the first access network device constructs a third virtual grid facing a 4G cell, and disconnects the first connection, so that the target terminal device is switched from a 5G network to a 4G network based on the third virtual grid, and is switched from the 4G network to a 3G network based on a fourth virtual grid, so that the target terminal device initiates the voice service in the 3G network, and the fourth virtual grid is constructed facing the 3G cell by a second access network device; when the voice service is finished, the first access network device reestablishes a second connection with the target terminal device, the second connection is triggered by a fifth virtual grid which is constructed by the second access network device and faces a 5G cell, the step of constructing the cell which faces the 5G cell by the second access network device is triggered by a switching request message which is sent to the second access network device by a third access network device, the switching request message is used for indicating that the target terminal device is switched from the 3G network to the 4G network, the switching request message carries private information, and the private information is used for indicating that the target terminal device is a terminal device supporting the 5G network.

With reference to the third aspect of the present application, in a first implementation manner of the third aspect of the present application, the constructing, by the first access network device, a third virtual grid facing a 4G cell includes: the first access network equipment acquires an MR which is reported periodically, the MR is obtained by the target terminal equipment through the measurement of the same frequency period, and the MR comprises an RSRP value of the 4G cell; the first access network equipment segments the RSRP value to obtain each RSRP segment number, RSRP interval values respectively corresponding to each RSRP segment number and cell IDs of 4G cells respectively corresponding to each RSRP segment number; the first access network equipment counts the number of attempts and the number of failures of any terminal equipment which establishes connection with the first access network equipment to switch from a 5G network to a 4G network within a preset time interval; and the first access network equipment constructs a third virtual grid list according to the RSRP segment numbers, the cell IDs, the trial times and the failure times.

In the above embodiments of the present application, a process of how the first access network device constructs the third virtual grid is specifically described, and specific operability is described.

With reference to the first implementation manner of the third aspect of the embodiments of the present application, in a second implementation manner of the third aspect of the embodiments of the present application, the method further includes: and the first access network equipment updates the third virtual raster list according to a preset period, so that the data of the third virtual raster list is more accurate.

With reference to the first implementation manner of the third aspect of the embodiment of the present application and the second implementation manner of the third aspect of the embodiment of the present application, in a third implementation manner of the third aspect of the embodiment of the present application, the switching, by the target terminal device, from the 5G network to the 4G network based on the third virtual grid includes: the first access network device determines a target RSRP segment number and a third target grid in the third virtual grid list corresponding to a target cell ID according to the obtained target MR of the current period, wherein the third target grid comprises the target RSRP segment number, the target cell ID, the attempt times and the failure times; the first access network equipment judges the type of the third target grid; and if the first access network equipment determines that the type of the third target grid is the first type, the target terminal equipment is switched from the 5G network to the 4G network in a blind mode.

In the above embodiments of the present application, how the target terminal device returns from the 5G network to the 4G network in a blind manner is specifically described, and the applicability is specific.

With reference to the third implementation manner of the third aspect of the examples of this application, in a fourth implementation manner of the third aspect of the examples of this application, the method further includes: if the first access network device determines that the type of the third target grid is the second type, the first access network device determines whether the historical switching form of any terminal device which establishes connection with the first access network device is switched from the 5G network to the 4G network in a blind mode; if yes, the target terminal equipment is switched from the 5G network to the 4G network in a blind mode; and if not, the target terminal equipment is switched from the 5G network to the 4G network according to a measuring mode.

With reference to the third implementation manner of the third aspect of the present application example and the fourth implementation manner of the third aspect of the present application example, in a fifth implementation manner of the third aspect of the present application example, the method further includes: and if the first access network equipment determines that the third target grid is of the third type, the target terminal equipment executes switching according to a preset mode.

In the above embodiments of the present application, how to switch the target terminal device according to the different types of the third virtual grids when the third virtual grids are of different types is respectively described, so that the method has flexibility, and improves the effectiveness of each switching process.

A fourth aspect of the present application further provides a method for performing interoperation between different access network devices, including: if the NR network does not deploy VONR and the LTE network does not deploy VOLTE, when the target terminal equipment initiates a voice service, the second access network equipment establishes a third connection with the target terminal equipment, and the third connection is triggered by a third virtual grid which is constructed by the first access network equipment and faces the 4G cell; the second access network equipment constructs a fourth virtual grid facing the 3G cell, so that the target terminal equipment is switched from a 4G network to a 3G network based on the fourth virtual grid, and the target terminal equipment initiates the voice service in the 3G network; when the voice service is finished, the second access network device obtains a handover request message sent by a third access network device, where the handover request message is used to indicate that the target terminal device is handed over from the 3G network to the 4G network, and the handover request message carries private information used to indicate that the target terminal device is a terminal device supporting the 5G network; the second access network equipment identifies the target terminal equipment as the terminal equipment supporting the 5G network according to the private information; and the second access network equipment constructs a fifth virtual grid facing the 5G cell, so that the target terminal equipment is switched from the 4G network to the 5G network based on the fifth virtual grid.

In the foregoing embodiment of the present application, the first access network device first reduces access delay by constructing a third virtual grid facing the 4G cell, that is, the target terminal device is switched from the 5G network to the 4G network based on the third virtual grid (e.g., in an EPS FB manner), and then, the second access network device reconstructs a fourth virtual grid facing the 3G cell to further reduce access delay, that is, the target terminal device is switched from the 4G network to the 3G network based on the fourth virtual grid (e.g., in a CSFB manner), and the second access network device reduces return delay by constructing a fifth virtual grid facing the 5G cell again, so that total time delay of interoperation between different access network devices is reduced, and user experience is improved.

With reference to the fourth aspect of the present application, in a first implementation manner of the fourth aspect of the present application, the constructing, by the second access network device, a fourth virtual grid facing the 3G cell includes: the second access network equipment acquires an MR which is reported periodically, the MR is obtained by the target terminal equipment through the measurement of the same frequency period, and the MR comprises an RSRP value of the 3G cell; the second access network equipment segments the RSRP value to obtain each RSRP segment number, RSRP interval values respectively corresponding to each RSRP segment number and cell IDs of the 3G cells respectively corresponding to each RSRP segment number; the second access network equipment counts the number of attempts and the number of failures of any terminal equipment which establishes connection with the second access network equipment to switch from the 4G network to the 3G network within a preset time interval; and the second access network equipment constructs a fourth virtual grid list according to the RSRP segment numbers, the cell IDs, the trial times and the failure times.

In the above embodiments of the present application, a process of how the second access network device constructs the fourth virtual grid is specifically described, and specific operability is described.

In combination with the first implementation manner of the fourth aspect of the embodiments of the present application, in the second implementation manner of the fourth aspect of the embodiments of the present application, the method further includes: and the second access network equipment updates the fourth virtual raster list according to a preset period, so that the data of the fourth virtual raster list is more accurate.

With reference to the first implementation manner of the fourth aspect of the embodiment of the present application and the second implementation manner of the fourth aspect of the embodiment of the present application, in a third implementation manner of the fourth aspect of the embodiment of the present application, the switching, by the target terminal device, from the 4G network to the 3G network based on the fourth virtual grid includes: the second access network device determines a target RSRP segment number and a fourth target grid in the fourth virtual grid list corresponding to a target cell ID according to the obtained target MR of the current period, wherein the fourth target grid comprises the target RSRP segment number, the target cell ID, the attempt times and the failure times; the second access network equipment judges the type of the fourth target grid; and if the second access network equipment determines that the type of the fourth target grid is the first type, the target terminal equipment is switched from the 4G network to the 3G network in a blind mode.

In the above embodiments of the present application, how the target terminal device returns from the 4G network to the 3G network in a blind manner is specifically described, and the specific applicability is described.

In combination with the third implementation manner of the fourth aspect of the example of the present application, in the fourth implementation manner of the example of the present application, the method further includes: if the second access network device determines that the type of the fourth target grid is the second type, the second access network device determines whether the historical switching form of any terminal device connected with the second access network device is switched from the 4G network to the 3G network in a blind manner; if yes, the target terminal equipment is switched from the 4G network to the 3G network in a blind mode; and if not, the target terminal equipment is switched from the 4G network to the 3G network according to a measuring mode.

With reference to the third implementation manner of the fourth aspect of the example of the present application and the fourth implementation manner of the fourth aspect of the example of the present application, in a fifth implementation manner of the example of the present application, the method further includes: and if the second access network equipment determines that the type of the fourth target grid is the third type, the target equipment executes switching according to a preset mode.

In the above embodiments of the present application, how to switch the target terminal device according to the different types of the fourth virtual grids when the fourth virtual grids are of different types is respectively described, so that the method has flexibility, and improves the effectiveness of each switching process.

With reference to the fourth aspect of the present application, and the first implementation manner of the fourth aspect to the fifth implementation manner of the fourth aspect, in a sixth implementation manner of the embodiment of the present application, the constructing, by the second access network device, a fifth virtual grid facing a 5G cell includes: the second access network equipment acquires an MR which is reported periodically, the MR is obtained by the target terminal equipment through the measurement of the same frequency period, and the MR comprises an RSRP value of the 5G cell; the second access network equipment segments the RSRP value to obtain each RSRP segment number, RSRP interval values respectively corresponding to each RSRP segment number and cell IDs of the 5G cells respectively corresponding to each RSRP segment number; the second access network equipment counts the number of attempts and the number of failures of any terminal equipment which establishes connection with the second access network equipment to switch from the 4G network to the 5G network within a preset time interval; and the second access network equipment constructs a fifth virtual grid list according to the RSRP segment numbers, the cell IDs, the trial times and the failure times.

In the above embodiments of the present application, a process of how the second access network device constructs the fifth virtual grid is specifically described, and specific operability is described.

In combination with the sixth implementation manner of the fourth aspect of the embodiment of the present application, in the seventh implementation manner of the embodiment of the present application, the method further includes: and the second access network equipment updates the fifth virtual raster list according to a preset period, so that the data of the fifth virtual raster list is more accurate.

With reference to the sixth implementation manner of the fourth aspect of the embodiment of the present application and the seventh implementation manner of the fourth aspect of the embodiment of the present application, in an eighth implementation manner of the embodiment of the present application, the switching, by the target terminal device, from the 4G network to the 5G network based on the fifth virtual grid includes: the second access network device determines a target RSRP segment number and a fifth target grid in the fourth virtual grid list corresponding to a target cell ID according to the obtained target MR of the current period, wherein the fifth target grid comprises the target RSRP segment number, the target cell ID, the attempt times and the failure times; the second access network equipment judges the type of the fifth target grid; and if the second access network device determines that the type of the fifth target grid is the first type, the target terminal device is switched from the 4G network to the 5G network in a blind manner.

In the above embodiments of the present application, how the target terminal device returns from the 4G network to the 5G network in a blind manner is specifically described, and the applicability is specific.

In combination with the eighth implementation manner of the fourth aspect of the embodiments of the present application, in a ninth implementation manner of the fourth aspect of the embodiments of the present application, the method further includes: if the second access network device determines that the type of the fifth target grid is the second type, the second access network device determines whether the historical switching form of any terminal device connected with the second access network device is switched from the 4G network to the 5G network in a blind manner; if yes, the target terminal equipment is switched from the 4G network to the 5G network in a blind mode; and if not, the target terminal equipment is switched from the 4G network to the 5G network according to a measuring mode.

With reference to the eighth implementation manner of the fourth aspect of the embodiments of the present application and the ninth implementation manner of the fourth aspect of the embodiments of the present application, in a tenth implementation manner of the fourth aspect of the embodiments of the present application, the method further includes: and if the second access network device determines that the type of the fifth target grid is the third type, the target device performs switching according to a preset mode.

In the above embodiments of the present application, how to switch the target terminal device according to the different types of the fifth virtual grids when the fifth virtual grids are of the different types is respectively described, so that the method has flexibility, and improves the effectiveness of each switching process.

A fifth aspect of the embodiments of the present application provides an access network device, where when the access network device is used as a first access network device, the access network device has a function of implementing the method according to any one of the foregoing first aspect or possible implementation manners of the first aspect, and the function may be implemented by hardware or may be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions; when the access network device is used as a second access network device, the access network device has a function of implementing the method according to any one of the second aspect and the second possible implementation manner, and the function may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the functions described above.

A sixth aspect of the embodiments of the present application further provides an access network device, where when the access network device is used as a first access network device, the access network device has a function of implementing the method according to any one of the above third aspect or the third aspect, where the function may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions; when the access network device is used as a second access network device, the access network device has a function of implementing the method according to any one of the above-mentioned fourth aspect or the possible implementation manner of the fourth aspect, and the function may be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the functions described above.

A seventh aspect of the present embodiment provides a data processing apparatus, which may include: a processor and a memory; the memory is used for storing programs; the processor is configured to execute the program to implement the steps of the method according to the first aspect as such or according to any one of the possible implementations of the first aspect.

An eighth aspect of the present application provides a data processing apparatus, which may include: a processor and a memory; the memory is used for storing programs; the processor is configured to execute the program to implement the steps of the method according to the second aspect as described above or any one of the possible implementations of the second aspect.

A ninth aspect of the present application provides a data processing apparatus, which may include: a processor and a memory; the memory is used for storing programs; the processor is configured to execute the program to implement the steps of the method according to the third aspect or any one of the possible implementation manners of the third aspect.

A tenth aspect of the embodiments of the present application provides a data processing apparatus, which may include: a processor and a memory; the memory is used for storing programs; the processor is configured to execute the program to implement the steps of the method according to the fourth aspect or any one of the possible implementations of the fourth aspect.

An eleventh aspect of an embodiment of the present application provides a communication system, which may include: the access network comprises a first access network device, a second access network device and a third access network device; the first access network device is configured to implement the steps of the method according to the first aspect or any one of the possible implementation manners of the first aspect; the second access network device is configured to implement the steps of the method according to the second aspect or any one of the possible implementation manners of the second aspect; and the third access network equipment is used for initiating a voice call to the target terminal equipment and sending a switching request message to the second access network equipment when the voice call is finished.

A twelfth aspect of an embodiment of the present application provides a communication system, which may include: the access network comprises a first access network device, a second access network device and a third access network device; the first access network device is configured to implement the steps of the method according to the third aspect or any one of the possible implementation manners of the third aspect; the second access network device is configured to implement the steps of the method according to any one of the fourth aspect and the fourth possible implementation manner; and the third access network equipment is used for initiating a voice call to the target terminal equipment and sending a switching request message to the second access network equipment when the voice call is finished.

A thirteenth aspect of the present application provides a chip system, which includes a processor, configured to support a first access network device, a second access network device, a third access network device, and so on, to implement the functions referred to in any implementation of any of the first to fourth aspects of the present application, for example, to process data and/or information referred to in the foregoing methods. In one possible design, the chip system further includes a memory for storing program instructions and data necessary for the first access network device, the second access network device, or the third access network device. The chip system may be formed by a chip, or may include a chip and other discrete devices.

The processor mentioned in any of the above may be a general Processing Unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the method in the first to fourth aspects.

A fourteenth aspect of the embodiments of the present application provides a storage medium, and it should be noted that a part of the technical solution of the present invention or a whole or part of the technical solution may be embodied in the form of a software product, where the computer software product is stored in a storage medium, and is used to store computer software instructions for the above-mentioned apparatus, and includes a program designed to execute any one of the embodiments of the first aspect to the fourth aspect as a data processing device, such as a first access network apparatus, a second access network apparatus, or a third access network apparatus.

The storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

A fifteenth aspect of embodiments of the present application provides a computer program product containing instructions which, when run on a computer, cause the computer to perform the method according to any of the embodiments of any of the first to fourth aspects of the present application.

According to the technical scheme, the embodiment of the application has the following advantages: firstly, a first access network device (the first access network device comprises an access network device supporting a 5G network) establishes a first connection with a target terminal device; if the NR deploys the VONR and the target terminal equipment initiates the voice service at the moment, the first access network equipment responds to the voice service initiated by the target terminal equipment; and in response to a trigger instruction (for example, the trigger instruction may be that the signal quality of a 5G network in an area where the target terminal device is located is weaker than that of a 3G network and the LTE network does not deploy VOLTE), the first access network device constructs a first virtual grid facing the 3G cell, and disconnects the first connection, and at this time, the voice service initiated by the target terminal device is switched from the 5G network to the 3G network based on the first virtual grid; when the voice service is ended at the 3G network side, the third access network device (the third access network device includes an access network device supporting a 3G network) sends a handover request message to the second access network device (the second access network device includes an access network device supporting a 4G network), where the handover request message is used to instruct the target terminal device to switch from the 3G network to the 4G network, and the handover request message carries private information, where the private information is used to instruct the target terminal device to be a terminal device supporting a 5G network; after the second access network device acquires the handover request message, it can be known that the target terminal device is a terminal device supporting a 5G network through the private message carried by the second access network device, and then the second access network device will construct a second virtual grid facing a 5G cell, and based on the second virtual grid, the first access network device will reestablish a second connection with the target terminal device (i.e., after the voice service is finished at the 3G side, the target terminal device is switched from the 3G network to the 4G network, and then returns to the 5G network). In the embodiment of the application, the first access network device reduces access delay by constructing the first virtual grid facing the 3G cell, and the second access network device reduces return delay by constructing the second virtual grid facing the 5G cell, so that the use experience of a user is improved.

Drawings

FIG. 1 is a diagram of a system architecture according to an embodiment of the present application;

FIG. 2 is a schematic diagram of interoperation between different access network devices;

FIG. 3 is another schematic diagram of interoperation between different access network devices;

fig. 4 is a schematic diagram of a method for performing inter-operation between different access network devices in this embodiment;

fig. 5 is another schematic diagram of a method for performing inter-operation between different access network devices in this embodiment;

FIG. 6 is a schematic diagram of a data processing apparatus according to an embodiment of the present application;

fig. 7 is a schematic diagram of a communication system in an embodiment of the present application.

Detailed Description

The embodiment of the application provides a method, a device and a system for interoperating different access network devices, which are used for reducing the access delay of a terminal device switched from a 5G network to a 3G network and reducing the return delay of the terminal device returned from a 4G network to the 5G network, so that the use experience of a user is improved.

Before describing the present embodiment, a description will first be given of network elements that may be involved in the embodiments of the present application. It should be understood that the conceptual explanation of the relevant network element may be limited by the specific case of the embodiment of the present application, but does not mean that the present application is limited to the specific case, and the specific case of different embodiments may also be different, and is not limited herein.

The terminal device, which may also be referred to as a User Equipment (UE), may be an intelligent device such as a mobile phone, a desktop computer, a notebook, a handheld computer, or an intelligent wearable device such as a smart watch and a smart bracelet, as long as the terminal device has functions of accessing a 2G/3G/4G/5G network and initiating a voice service, and the specific example here is not limited to the terminal device. In the embodiment of the application, the terminal device is used for initiating the voice service.

The NG Radio Access Network (NG-RAN), the name of the base station in the NR, in this embodiment of the present application, is responsible for the terminal device to initiate a Voice Over NR (VONR) Network and to switch the voice service initiated by the terminal device to a 4G Network or a 3G Network in a preset manner. It should be noted that the NG-RAN provided in the embodiments of the present application may be applied to various communication networks, for example, may be applied to a 5G network, and may also be applied to a future communication network, for example, a 6G network, a 7G network, and the like, and the name of the network element of the NG-RAN is not limited, and may be replaced by the name of a network element having the same or similar function in the future communication network, and the present application is not limited. For convenience of description, in the embodiments of the present application, the application of NG-RAN to a 5G network is taken as an example for illustration. In the embodiment of the present application, the device having the above-described function of implementing the NG-RAN may also be collectively referred to as a first access network device.

Compared with a Node B in an existing 3G Network, an Evolved Node B (eNodeB), abbreviated as eNB, a name of a base station in LTE integrates functions of a part of Radio Network Controllers (RNCs), and reduces a protocol level during communication, in this embodiment of the present application, the Evolved Node B is configured to return to a 3G/2G Network by executing a preset handover mode (e.g., a CSFB mode) on a terminal device on a 4G Network side, and perform handover, redirection or reselection to a terminal device on the 4G Network side (if the terminal device is a terminal device supporting a 4G Network and a 5G Network) to the 5G Network side, and further, analyze private information carried in a handover request message sent by a third access Network device (e.g., RNC). In the embodiment of the present application, devices having the above-described functions of the eNodeB may also be collectively referred to as second access network devices.

An RNC, which is a main network element in a third generation (3G) wireless network, is a component of an access network and is responsible for mobility management, call processing, link management and handover mechanisms; a Base Station Controller (BSC) is a main network element in a second generation (2G) wireless network, is a connection point between a Base transceiver Station and a mobile switching center, and also provides an interface for exchanging information between the Base transceiver Station and the mobile switching center. In this embodiment, the RNC/BSC is responsible for initiating a voice call to a terminal device on the 3G/2G network side, performing handover, redirection or reselection to the terminal device on the 3G/2G network side (if the terminal device is a terminal device supporting a 4G network and a 5G network), and returning to the 4G network side, and carries private information to notify a second access network device on the 4G network side that the terminal device is a terminal device supporting a 5G network.

In addition, a system architecture related to the embodiment of the present application will be further described, as shown in fig. 1, which is an SA networking scenario applied in the embodiment of the present application, and in the SA networking scenario, if a terminal device (the terminal device is a terminal device supporting a 5G network) has a voice service, the terminal device may be carried in three ways, namely a way 1, a way 2, and a way 3, shown in fig. 1, and the three ways are specifically described above and are not described herein again.

In the method 1, if the NR has deployed the VONR, the voice service initiated by the terminal device may be directly established on the NR, and the specific steps may be as shown in fig. 2.

201. The terminal equipment is directly switched from the 5G network to the 3G network in an SRVCC mode.

The terminal device is directly switched from the 5G network to the 3G network (i.e. the terminal device is switched from establishing connection with the first access network device to establishing connection with the third access network device) through the SRVCC mode, and before the step of performing the switching through the SRVCC mode, there may be two specific execution modes: 1) the measurement mode is that when the 5G network on the NR side is in weak coverage, the terminal equipment firstly carries out different system measurement facing the UMTS on the NR side, if the cell signal of the 3G network meets a certain condition, the terminal equipment is switched to the 3G network through the SRVCC mode, and the mode has measurement time delay. 2) In a blind manner, when the 5G network on the NR side is in weak coverage, the terminal device does not measure on the NR side, and directly switches to the 3G network through the SRVCC in a blind manner (i.e., without measuring), which has a disadvantage that if the coverage of the 3G network and the coverage of the 5G network are not consistent, there is a risk of stepping on empty and dropping the call.

202. The terminal equipment returns to the 4G network through switching/redirection.

After the terminal device completes the voice service at the 3G side, the terminal device will return to the 4G network side through the switching/redirection from the 3G network to the 4G network (i.e., the terminal device switches from the connection established with the third access network device to the connection established with the second access network device), and the return delay at this stage is about 500 milliseconds.

203. The terminal device returns to the 5G network by reselection.

After the terminal device returns from the 3G network, because the second access network device on the 4G network side cannot perceive that the terminal device is a terminal device supporting the 5G network, the second access network device will not perform handover or redirection from the 4G network to the 5G network on the terminal device, and only can return the terminal device to the 5G network in an idle state in a manner of manual reselection by a user, where a time delay manually set by the user is about 7-8 seconds, and if there is a PS service on the terminal device at this time, the terminal device will be suspended on the 4G network side for a long time before the PS service is ended to be in an idle state to perform reselection by the user, so that a return time delay of the terminal device from the 4G network to the 5G network is longer.

In addition, in the method 3, if the NR does not deploy the VONR and the LTE network does not deploy the VOLTE, the terminal device may initiate the voice service on the 3G network side, and the specific steps may be as shown in fig. 3.

301. And the terminal equipment is switched from the 5G network to the 4G network in an EPS FB mode.

First, the terminal device switches from the 5G network to the 4G network through the EPS FB mode (that is, the terminal device switches from establishing connection with the first access network device to establishing connection with the second access network device), before the step of performing switching through the EPS FB mode, there may be two specific execution modes: 1) in the measurement mode, the terminal equipment firstly performs LTE-oriented inter-system measurement on an NR side, and if a cell signal of a 4G network meets a certain condition, the terminal equipment is switched to the 4G network in an EPS FB mode, and the measurement time delay is also realized in the mode. 2) In a blind manner, the terminal device does not measure on the NR side, and directly switches to the 4G network through the EPS FB in a blind manner (i.e., without measuring), which has a disadvantage that if the coverage of the 4G network and the coverage of the 5G network are not consistent, there is a risk of stepping on empty and dropping the call.

302. And the terminal equipment is switched from the 4G network to the 3G network in a CSFB mode.

The terminal device is switched from the 5G network to the 4G network in the EPS FB manner, and is further switched from the 4G network to the 3G network in the CSFB manner (that is, the terminal device is switched from establishing connection with the second access network device to establishing connection with the third access network device), before the step of performing switching in the CSFB manner, there may be two specific execution manners: 1) in the measurement mode, the terminal equipment performs UMTS-oriented heterogeneous system measurement on an LTE side, and if a cell signal of a 3G network meets a certain condition, the 3G network is switched to through a CSFB mode, and the mode has measurement time delay. 2) In a blind mode, the terminal device is not measured on the LTE side, and is switched to the 3G network directly through a blind mode (i.e. not measured) CSFB, which has a disadvantage that if the coverage of the 4G network and the 3G network is not consistent, there is a risk of stepping on empty and dropping the call.

303. The terminal equipment returns to the 4G network through switching/redirection.

304. The terminal device returns to the 5G network by reselection.

Steps 303-304 are similar to steps 202-203 described above and will not be described herein.

In summary, the terminal device switches from the 5G network to the 3G network by the method 1 or the method 3, and both of the two switching methods have a large access delay; in addition, in the mode 1 and the mode 3, after the terminal device finishes switching the voice service from the 3G network to the 4G network, the access network device on the 4G network side cannot perceive that the terminal device is a terminal device supporting the 5G network, and then the access network device on the 4G network side does not perform switching or redirection from the 4G network to the 5G network on the terminal device, and the terminal device can only return to the 5G network by the user in the idle state in a reselection manner, at this time, the return time delay of the terminal device returning to the 5G network is about 8 seconds, if the terminal device also has a PS service, the terminal device needs to wait for the terminal device to return to the idle state after the PS service is finished to perform reselection operation by the user, and at this time, the terminal device may hang up on the 4G network side for a long time, which results in a longer return time delay. The time consumption of the access delay and the return delay is long, so that the use experience of the user is poor.

In order to solve the above problems caused by the foregoing manner, an embodiment of the present application provides a method for performing inter-operation between different access network devices, where the method is applied to the system architecture shown in fig. 1, and is described in several cases below. In the following embodiments of the present application, a terminal device supporting a 5G network is referred to as a target terminal device.

Firstly, the target terminal equipment is directly switched to a 3G network from a 5G network.

Referring to fig. 4, an embodiment of the present application first provides a method for performing an inter-operation between different access network devices, which is described in detail as follows.

401. The first access network device establishes a first connection with the target terminal device.

First, the first access network device establishes a first connection with the target terminal device, that is, the target terminal device uses the 5G network service provided by the first access network device at this time.

402. And the target terminal equipment initiates a voice service.

If the NR network is deployed with a VONR, when the target terminal device initiates a voice service, the voice service is directly established on the NR network side.

403. The first access network device constructs a first virtual grid towards the 3G cell.

When the first access network device carries a voice service initiated by the target terminal device, if the first access network device obtains the trigger instruction at this time, the first access network device will construct a first virtual grid facing the 3G cell. The trigger instruction may have various forms, and is not limited herein, for example, the trigger instruction may be that the signal quality of a 5G network in an area where the target terminal device is located is weaker than that of a 3G network, and the LTE network does not deploy VOLTE. That is, if the NR is in weak coverage and the 4G network cannot carry the voice service of the target terminal device, the first access network device will construct a first virtual grid facing the 3G cell.

It should be noted that, in some embodiments of the present application, the manner in which the first access network device constructs the first virtual grid facing the 3G cell may be performed by the following steps:

step 1, a first access network device obtains a Measurement Report (MR) periodically reported by a target terminal device, wherein the MR is obtained by the target terminal device through periodic Measurement of the same frequency, and the MR comprises a Reference Signal Receiving Power (RSRP) value of the 3G cell.

And 2, the first access network equipment processes the MR reported periodically, namely, the obtained RSRP values are segmented to obtain RSRP segment numbers, RSRP interval values respectively corresponding to the RSRP segment numbers and cell IDs of 3G cells respectively corresponding to the RSRP segment numbers.

For ease of understanding, the following is illustrated in Table 1: first, the first access network device segments the RSRP value measured in the MR according to a preset segmentation step (in table 1, it is illustrated that the segmentation step is 3dB, actually, the segmentation step may be any value set by a user, such as 4dB, 10dB, etc., which is not limited here), since the RSRP value range is [ -156, -31] specified by a protocol, different RSRP interval values, RSRP segment numbers corresponding to the RSRP interval values, and cell IDs of 3G cells corresponding to the RSRP interval values in table 1 can be obtained according to a segmentation form in which the segmentation step is 3 dB. For example, the third column in table 1 may be arranged in the order of the numerical values of the cell IDs from small to large, and table 1 indicates that the cell IDs corresponding to the first four RSRP intervals are 001, 002, and 004, respectively.

Table 1: corresponding relation among RSRP interval value, RSRP segment number and cell ID of 3G cell

RSRP interval value	RSRP segment number	Cell ID for 3G cells
			[-156,-153)	0	001
[-153,-150)	1	001
			[-150,-147)	2	002
[-147,-144)	3	004
			……	……	……

Because the MR acquired by the first access network device is periodic, based on the acquired MR and table 1, the first access network device will also automatically generate a same-frequency MR field information table shown in table 2, where table 2 includes MR reporting time, cell IDs of each 3G cell, and RSRP segment numbers corresponding to the cell IDs. It should be noted that the first access network device may automatically classify, according to the segmented RSRP interval value, the RSRP segment number to which the cell ID of each 3G cell belongs, as shown in table 2 below. This is a table automatically generated according to the MR reported by the target terminal device (since the RSRP segment number is already better by the first access network device, table 2 only needs to be automatically generated according to the algorithm at this time).

Table 2: same frequency MR field information table

MR reporting time	2019.09.14 8:00
		ID of 3G cell 1	001
RSRP segment number of 3G cell 1	0、1
		ID of 3G cell 2	002
RSRP segment number of 3G cell 2	2
		ID of 3G cell 3	003
RSRP segment number of 3G cell 3	Is free of
		ID of 3G cell 4	004
3G cell 4 RSRP segment number	3
		……	……

Step 3, after that, the first access network device counts the number of attempts and the number of failures of any terminal device establishing connection with the first access network device from the 5G network to the 3G network within a preset time interval (for example, 24 hours, 48 hours, 72 hours, where the preset time interval may be set by itself, and is not limited herein). In some embodiments of the present application, the number of attempts and the number of failures of the terminal device to switch from the 5G network to the 3G network in two scenarios need to be counted:

scenario 1, handover is performed (including blind or post-measurement handover).

Counting the number of attempts: when the first access network equipment sends a message for executing switching to the target terminal equipment, counting the number of one-time attempts in the 5G cell to which the target terminal equipment belongs currently.

Counting the failure times: in the process that the target terminal device executes the switching from the 5G network to the 3G network, if the first access network device obtains a switching failure message returned by the target terminal device, the number of times of one failure is recorded.

It should be noted that, in scenario 1, the common-frequency MR used when the first access network device records the number of attempts and the number of failures is the common-frequency MR in a preset time period (for example, 5 seconds, 8 seconds, 10 seconds, and the like) before the corresponding signaling, where the preset time period may be set by itself, and is not limited this time).

Scenario 2, measurement timeout scenario.

When the target terminal device starts to perform a compression mode measurement on the UMTS neighbor area, if the first access network device does not receive the reported MR within a preset time (for example, within a time of 20 seconds, the preset time may be set by itself, and is not limited here), the measurement on the target terminal device is stopped, and at this time, the first access network device records the number of attempts and the number of failures.

It should be noted that, in scenario 2, the common-frequency MR used when the first access network device records the number of attempts and the number of failures is the common-frequency MR in a preset time period (for example, 5 seconds, 8 seconds, 10 seconds, and the like, which may be set by itself, and this time is not limited) before the stamper timeout time.

And step 4, finally, the first access network equipment constructs a first virtual grid list according to the RSRP segment numbers, the cell IDs, the trying times and the failure times. In a preset time interval, counting the number of attempts and the number of failures of any terminal device to switch from the 5G network to the 3G network in a grid in the preset time interval of the current period, and if the preset time interval is 1 day, counting the number in the grid of the current day. The specific process can be as follows: and (3) interoperating original information (namely the number of attempts and the number of failures) from the 5G network to the 3G network, and filling the same-frequency MR fields in the constructed first virtual grid list if the same-frequency MR fields exist in a preset time period (such as 5 seconds, 8 seconds, 10 seconds and the like, wherein the preset time period can be set by a user, and is not limited at this time). And then, the raster records can be found according to the same-frequency MR field information in the table 2, if the corresponding raster records are found, the trial times in the original information are accumulated into the trial times from the 5G network to the 3G network on the same day in the raster records, and the failure times in the original information are accumulated into the failure times from the 5G network to the 3G network on the same day in the raster records. And if the raster record cannot be searched according to the same-frequency MR field information, newly adding the raster record in the first virtual raster list. For convenience of understanding, the first virtual grid list is illustrated below by taking table 3 as an example (taking the preset time interval as 1 day as an example), it should be noted that table 3 only illustrates grid information such as the number of failures and the number of attempts of any terminal device to access one 3G cell (e.g., 3G cell 1) within the preset time interval, and actually, there are 3G cells 2, 3G cells 3, … …, and 3G cell n, and table 3 only illustrates one of the 3G cells (i.e., 3G cell 1).

Table 3: first virtual grid List

ID of 3G cell 1	001
		RSRP segment number corresponding to 3G cell 1	0、1
Failure times from 5G network to 3G network on the same day	13
		Number of attempts from 5G network to 3G network on the same day	78
Historical 5G network to 3G network failure times	21
		Historical 5G to 3G network attempts	421
……	……

It should be noted that, in some embodiments of the present application, the first access network device may further update the first virtual grid list according to a preset period, so as to delete an invalid grid and reduce the number of redundant grids.

For ease of understanding, the cycle is schematically illustrated as a day (i.e., 24 hours): a fixed time point of each day (e.g., 5:00, 8:00, etc. in the morning of each day, which is not limited herein) may be selected to start refreshing the first virtual grid list, and if the "historical 5G network to 3G network attempt number" is 0, the "5G network to 3G network attempt number on the same day" and the "5G network to 3G network failure number on the same day" are directly updated into the history, and the "5G network to 3G network attempt number on the same day" and the "5G network to 3G network failure number on the same day" are set to 0. If the 'number of attempts from the historical 5G network to the 3G network' is not 0, filtering by using the following filtering formula to obtain the 'number of attempts from the historical 5G network to the 3G network' and the 'number of failures from the historical 5G network to the 3G network', and setting the 'number of attempts from the 5G network to the 3G network on the same day' and the 'number of failures from the 5G network to the 3G network on the same day' to be 0. The filter formula is as follows:

Fn＝(1-a)*F(n-1)+a*Mn

wherein a is a virtual grid filter coefficient (a value can be set by itself, such as 0.3, 0.8, etc., and is not limited herein, for example, when a is a default value of 0.6, the influence of history information before 5 days on the current grid is substantially negligible); fn is the filtered raster information of the current period, F (n-1) is the raster information of the previous period, and Mn is the unfiltered raster information of the current period. For example, when the period is 1 day (i.e., 24 hours), if n is 6, F6 is the grid information of the filtered 6 th day, F5 is the grid information of the 5 th day, and M6 is the grid information of the unfiltered 6 th day.

It should be further noted that, in some embodiments of the present application, if the "number of historical 5G network to 3G network attempts" in the filtered first virtual grid list is lower than 0.5, the corresponding grid information needs to be deleted. The deletion of the raster information may be performed after each update of the raster information, or may be performed after all updates of the raster information, which is not limited herein. But the deletion of the raster information is executed after each update of the raster information, so that invalid raster information can be deleted as early as possible, and the condition that the number of the raster information exceeds the specification of the list is avoided.

404. Voice traffic is switched from the 5G network to the 3G network based on the first virtual grid.

After the first access network device constructs a first virtual grid facing the 3G cell, the voice service on the target terminal device is switched from the 5G network to the 3G network based on the first virtual grid, and the specific implementation steps may be:

first, a first access network device determines a target RSRP segment number and a first target grid in a first virtual grid list corresponding to a target cell ID according to an acquired target MR of a current period (i.e., a currently acquired same-frequency MR), where the first target grid includes the target RSRP segment number, the target cell ID, the number of attempts, and the number of failures. That is to say, the first access network device queries, according to the cell ID and RSRP segment number of the 3G cell in the same-frequency MR acquired this time, historical raster information corresponding to the cell ID and the RSRP segment number and raster information in the current period in the first virtual raster list, so as to determine whether the voice service on the target terminal device is switched from the 5G network to the 3G network. There are three results of the determination, which are set forth below:

first, the first access network device judges the type of the first target grid according to the grid information. It should be noted that the type of the first virtual grid may be classified according to a principle of "success rate (number of attempts-number of failures)/number of attempts", where the success rate may be a historical success rate, or a previous cycle success rate, and the success rate is not limited herein, and when the power is the historical success rate, the number of attempts is "number of attempts of historical 5G network to 3G network", and the number of failures is "number of failures of historical 5G network to 3G network"; when the power is the success rate of the current period, taking the current period as one day as an example, the success rate of the current period is the success rate of the current day, the number of attempts at this time is the "number of attempts from the 5G network to the 3G network on the current day", and the number of failures is the "number of failures from the 5G network to the 3G network on the current day". In the embodiment of the present application, the first virtual grid may be divided into 3 types according to the classification principle, where the first type includes: historical success rate > a first preset percentage (e.g., 99%); the second type includes: a second preset percentage (e.g., 5%) < historical success rate < first preset percentage (e.g., 99%); the third type includes: historical success rate < a second predetermined percentage (e.g., 5%). The first predetermined percentage and the second predetermined percentage may be set by themselves, and are not described herein.

Based on the above, the first access network device determines the type of the first target grid according to the grid information, and has three results:

as a result 1, if the first access network device determines that the type of the first target grid is the first type, the voice service is directly returned to the 3G network from the 5G network in a blind manner (e.g., returned in an SRVCC manner).

If the first access network device determines that the type of the first target grid is the second type, the first access network device further judges whether the historical voice service is returned to the 3G network from the 5G network in a blind mode; if yes, the voice service is returned to the 3G network from the 5G network in a blind mode; and if not, returning the voice service to the 3G network from the 5G network according to a measuring mode.

And 3, if the first access network equipment determines that the type of the first target grid is the third type, the voice service executes switching according to a preset mode. For example, the first access network device may randomly select a preset percentage (e.g., 5%) of terminal devices to perform handover from the 5G network back to the 3G network based on the measurement mode, where the remaining 95% of the terminal devices do not perform handover, perform handover of the measurement mode if the target terminal device happens to be in the above 5%, and not perform handover if the target terminal device happens to be in the above 95%. For another example, if the first access network device determines that the first virtual grid type is the third type, then the handover is not executed. The preset manner is not limited herein.

405. The third access network equipment carries the voice service.

And after the voice service is returned to the 3G network by the 5G network based on the first virtual grid, the voice service is carried by the third access network equipment.

406. And after the voice service is finished, the third access network equipment sends a switching request message to the second access network equipment so that the target terminal equipment returns to the 4G network through switching/redirection.

After the voice service is finished, the third access network device sends a switching request message to the second access network device, wherein the switching request message is used for indicating the target terminal device to be switched from the 3G network to the 4G network, and based on the switching request message, the target terminal device returns to the 4G network through switching/redirection. In the embodiment of the present application, the handover request message carries private information, where the private information is used to indicate that the target terminal device is a terminal device supporting a 5G network.

407. And the second access network equipment analyzes the switching request message.

After acquiring the handover request message sent by the third access network device, the second access network device analyzes the handover request message, thereby identifying that the target terminal device is a terminal device supporting a 5G network.

408. The second access network device constructs a second virtual grid oriented towards the 5G cell.

After the second access network device identifies that the target terminal device is a terminal device supporting a 5G network, a second virtual grid facing the 5G cell is constructed.

It should be noted that, in some embodiments of the present application, the second access network device may construct the second virtual grid facing the 5G cell by:

step 1, second access network equipment acquires an MR periodically reported by target terminal equipment, wherein the MR is obtained by the target terminal equipment through same-frequency periodic measurement, and the MR comprises an RSRP value of a 5G cell.

And step 2, the second access network equipment processes the MR reported periodically, namely, the obtained RSRP values are segmented to obtain RSRP segment numbers, RSRP interval values respectively corresponding to the RSRP segment numbers and cell IDs of 5G cells respectively corresponding to the RSRP segment numbers.

For ease of understanding, the following is illustrated in Table 4 as an example: firstly, the second access network device segments the RSRP value measured in the MR according to a preset segmentation step (in table 4, the segmentation step is still illustrated as 3dB, actually, the segmentation step may be any value set by the user, such as 4dB, 10dB, etc., and is not limited here), since the RSRP value range is [ -156, -31] specified by the protocol, different RSRP interval values, RSRP segment numbers corresponding to the RSRP interval values, and cell IDs of 5G cells corresponding to the RSRP interval values in table 4 can be obtained according to the segmentation form in which the segmentation step is 3 dB. For example, the cell IDs may be arranged in the third column in table 4 in the order from small to large, and the cell IDs corresponding to the first six RSRP intervals are 101, 102, 103, and 104, respectively, as illustrated in table 4.

Table 4: corresponding relation among RSRP interval value, RSRP segment number and cell ID of 5G cell

RSRP interval value	RSRP segment number	Cell ID of 5G cell
			[-156,-153)	0	101
[-153,-150)	1	102
			[-150,-147)	2	102
[-147,-144)	3	102
			[-144,-141)	4	103
[-141,-138)	5	104
			……	……	……

Because the MR acquired by the second access network device is periodic, based on the acquired MR and table 4, the second access network device will also automatically generate a same-frequency MR field information table shown in table 5, where the table 5 includes the MR reporting time, the cell ID of each 5G cell, and the RSRP segment number corresponding to the cell ID. It should be noted that the second access network device may automatically classify, according to the segmented RSRP interval value, the RSRP segment number to which the cell ID of each 5G cell belongs, as shown in table 5 below. This is a table automatically generated according to the MR reported by the target terminal device (since the RSRP segment number is already assigned by the second access network device, table 5 only needs to be automatically generated according to the algorithm at this time).

Table 5: same frequency MR field information table

MR reporting time	2019.09.14 10:00
		ID of 5G cell 1	101
RSRP segment number for 5G cell 1	0
		ID of 5G cell 2	102
RSRP segment number for 5G cell 2	1、2、3
		ID of 5G cell 3	103
RSRP segment number for 5G cell 3	4
		5G cell 4 ID	104
RSRP segment number for 5G cell 4	5
		……	……

Step 3, after that, the second access network device counts the number of attempts and the number of failures of any terminal device establishing connection with the second access network device to switch from the 4G network to the 5G network within a preset time interval (for example, 24 hours, 48 hours, 72 hours, where the preset time interval may be set by itself, and is not limited herein). In some embodiments of the present application, the number of attempts and the number of failures of the terminal device to switch from the 4G network to the 5G network in two scenarios need to be counted:

Counting the number of attempts: when the second access network device sends a message for executing the switching to the target terminal device, counting the number of one-time attempts in the 4G cell to which the target terminal device belongs currently.

Counting the failure times: in the process that the target terminal device performs switching from the 4G network to the 5G network, if the second access network device obtains a switching failure message returned by the target terminal device, recording the failure times of one time.

It should be noted that, in scenario 1, the common-frequency MR used when the second access network device records the number of attempts and the number of failures is the common-frequency MR in a preset time period (for example, 5 seconds, 8 seconds, 10 seconds, and the like) before the corresponding signaling, where the preset time period may be set by itself, and this time is not limited.

Scenario 2, measurement timeout scenario.

When the target terminal device starts the pressure mode measurement NR neighbor area, if the second access network device does not receive the reported MR within a preset time (for example, within a time of 20 seconds, the preset time may be set by itself, and is not limited here), the measurement of the target terminal device is stopped, and at this time, the second access network device records the number of attempts and the number of failures.

It should be noted that, in scenario 2, the common-frequency MR used when the second access network device records the number of attempts and the number of failures is the common-frequency MR in a preset time period (for example, 5 seconds, 8 seconds, 10 seconds, and the like, which may be set by itself, and this time is not limited) before the stamper timeout time.

And 4, finally, the second access network equipment constructs a second virtual grid list according to the RSRP segment numbers, the cell IDs, the trial times and the failure times. In a preset time interval, counting the number of attempts and the number of failures of any terminal device to be switched from the 4G network to the 5G network in a grid in the preset time interval of the current period, and if the preset time interval is 1 day, counting the number in the grid of the current day. The specific process can be as follows: and interoperating original information (namely the trial times and the failure times) from the 4G network to the 5G network, and filling the information into the constructed second virtual grid list if the same-frequency MR fields in a preset time period (such as 5 seconds, 8 seconds, 10 seconds and the like) exist. And then, the raster records can be searched according to the same-frequency MR field information of the table 5, if the corresponding raster records are found, the trial times in the original information are accumulated into the trial times from the 4G network to the 5G network on the same day in the raster records, and the failure times in the original information are accumulated into the failure times from the 4G network to the 5G network on the same day in the raster records. And if the raster record cannot be searched according to the same-frequency MR field information, newly adding the raster record in the second virtual raster list. For convenience of understanding, the second virtual grid list is illustrated below by taking table 6 as an example (taking the preset time interval as 1 day as an example), it should be noted that table 6 only illustrates grid information such as the number of failures and the number of attempts of any terminal device to access one 5G cell (e.g., 5G cell 1) within the preset time interval, actually, 5G cells 2, 5G cells 3, … …, and 5G cell n are still present, and table 6 only illustrates one of the 5G cells (i.e., 5G cell 1).

Table 6: second virtual grid List

ID of 5G cell 1	101
		RSRP segment number corresponding to 5G cell 1	0
Failure times from 4G network to 5G network on the same day	4
		Number of 4G network to 5G network attempts on the same day	212
Historical 4G network to 5G network failure times	14
		Historical 4G to 5G network attempts	564
……	……

It should be noted that, in some embodiments of the present application, the second access network device may further update the second virtual grid list according to a preset period, so as to delete an invalid grid and reduce the number of redundant grids. It should be further noted that the manner in which the second access network device updates the second virtual grid list according to the preset period is similar to the manner in which the first access network device updates the first virtual grid list according to the preset period, and details are not repeated here.

409. And the target terminal equipment returns to the 5G network through switching.

After the second access network device constructs a second virtual grid towards the 5G cell, the target terminal device may switch from the 4G network back to the 5G network based on the second virtual grid. The specific implementation steps can be as follows:

first, the second access network device determines, according to the obtained target MR of the current period (i.e., the obtained same-frequency MR of this time), a target RSRP segment number and a second target grid in a second virtual grid list corresponding to a target cell ID, where the second target grid includes the target RSRP segment number, the target cell ID, the number of attempts, and the number of failures. That is to say, the second access network device queries, according to the cell ID and RSRP segment number of the 5G cell in the same-frequency MR acquired this time, historical grid information corresponding to the cell ID and the RSRP segment number and grid information in the current period in the second virtual grid list, so as to determine whether the target terminal device is switched from the 4G network to the 5G network. There are three results of the determination, which are set forth below:

first, the second access network device determines the type of the second target grid according to the grid information, it should be noted that the determination principle is similar to that of the first access network device determining the type of the first virtual grid, and details are not repeated here.

Then, the second access network device determines the type of the second target grid according to the grid information, and has three results:

and as a result 1, if the second access network device determines that the type of the second target grid is the first type, the target terminal device directly switches from the 4G network to the 5G network in a blind manner.

And if the second access network device determines that the type of the second target grid is the second type, the second access network device further determines whether the historical switching form of any terminal device connected with the second access network device is switched from the 4G network to the 5G network in a blind mode. If so, the target terminal equipment is switched from the 4G network to the 5G network in a blind mode; and if not, the target terminal equipment is switched from the 4G network to the 5G network according to the measuring mode.

And if the second access network device determines that the type of the second target grid is the third type, the second access network device further determines whether the historical switching form of any terminal device connected with the second access network device is switched from the 4G network to the 5G network in a blind mode. The target device performs handover in a preset manner, for example, the second access network device may randomly select a preset percentage (e.g., 5%) of terminal devices to perform handover from the 5G network back to the 3G network based on the measurement manner, and perform no handover for the remaining 95%, perform handover in the measurement manner if the target terminal device happens to be at the above 5%, and perform no handover for the target terminal device when the target terminal device happens to be at the above 95%. For another example, if the second access network device determines that the second virtual grid type is the third type, then the handover is not executed. The preset manner is not limited herein.

410. The first access network device establishes a second connection with the target terminal device.

After the target terminal device returns to the 5G network from the 4G network through the handover, the first access network device may reestablish the second connection with the target terminal device.

And secondly, switching the target terminal equipment from the 5G network to the 4G network, and then switching the target terminal equipment from the 4G network to the 3G network.

Referring to fig. 5, an embodiment of the present application provides another method for performing an inter-operation between different access network devices, which is described in detail below.

501. The first access network device establishes a first connection with the target terminal device.

502. And the target terminal equipment initiates a voice service.

If the NR network does not deploy the VONR and the LTE network does not deploy the VOLTE, the voice service initiated by the target terminal device cannot be established on the NR network and the LTE network, and the voice service needs to be accepted by the 3G network side.

503. The first access network device constructs a third virtual grid facing the 4G cell.

Since the voice service initiated by the target terminal device in step 502 cannot be accepted at the 5G network and the 4G network, the voice service can only be accepted by the 3G network, and at this time, the first access network device will construct a third virtual grid facing the 4G cell.

It should be noted that, in some embodiments of the present application, the manner in which the first access network device constructs the third virtual grid facing the 4G cell may be performed by the following steps:

step 1, a first access network device obtains an MR periodically reported by a target terminal device, wherein the MR is obtained by the target terminal device through measurement of the same frequency period, and the MR comprises an RSRP value of the 4G cell.

And 2, the first access network equipment processes the MR reported periodically, namely, the obtained RSRP values are segmented to obtain RSRP segment numbers, RSRP interval values respectively corresponding to the RSRP segment numbers and cell IDs of 4G cells respectively corresponding to the RSRP segment numbers.

For ease of understanding, the following is illustrated in Table 7: first, the first access network device segments the RSRP value measured in the MR according to a preset segmentation step (in table 7, it is illustrated that the segmentation step is 3dB, actually, the segmentation step may be any value set by a user, such as 4dB, 10dB, and the like, and is not limited here), since the RSRP value range is [ -156, -31] specified by a protocol, different RSRP interval values, RSRP segment numbers corresponding to the RSRP interval values, and cell IDs of 4G cells corresponding to the RSRP interval values in table 7 can be obtained according to a segmentation form in which the segmentation step is 3 dB. For example, the cell IDs may be arranged in the third column in table 7 in the order from small to large, and table 7 illustrates that the 4G cell IDs corresponding to the first five RSRP intervals are 201, 202, 203, and 204, respectively.

Table 7: corresponding relation among RSRP interval value, RSRP segment number and cell ID of 4G cell

RSRP interval value	RSRP segment number	Cell ID for 4G cells
			[-156,-153)	0	201
[-153,-150)	1	202
			[-150,-147)	2	203
[-147,-144)	3	203
			[-144,-141)	4	204
……	……	……

Because the MR acquired by the first access network device is periodic, based on the acquired MR and table 7, the first access network device will also automatically generate a same-frequency MR field information table shown in table 8, where the table 8 includes MR reporting time, cell IDs of each 4G cell, and RSRP segment numbers corresponding to the cell IDs. It should be noted that the first access network device may automatically classify, according to the segmented RSRP interval value, the RSRP segment number to which the cell ID of each 4G cell belongs, as shown in table 8 below. This is a table automatically generated according to the MR reported by the target terminal device (since the RSRP segment number is already better by the first access network device, table 8 only needs to be automatically generated according to the algorithm at this time).

Table 8: same frequency MR field information table

MR reporting time	2019.09.15 5:00
		ID of 4G cell 1	201
RSRP segment number for 4G cell 1	0
		ID of 4G cell 2	202
RSRP segment number for 4G cell 2	1
		ID of 4G cell 3	203
RSRP segment number for 4G cell 3	2、3
		ID of 4G cell 4	204
RSRP segment number for 4G cell 4	4
		……	……

Step 3, after that, the first access network device counts the number of attempts and the number of failures of any terminal device establishing connection with the first access network device from the 5G network to the 4G network within a preset time interval (for example, 24 hours, 48 hours, 72 hours, where the preset time interval may be set by itself, and is not limited herein). In some embodiments of the present application, the number of attempts and the number of failures of the terminal device to switch from the 5G network to the 4G network in two scenarios need to be counted:

Counting the failure times: in the process that the target terminal device performs switching from the 5G network to the 4G network, if the first access network device obtains a switching failure message returned by the target terminal device, recording the failure times of one time.

Scenario 2, measurement timeout scenario.

When the LTE neighbor area is measured by the target terminal device in the compression mode, if the first access network device does not receive the reported MR within a preset time (e.g., within a time of 20 seconds, the preset time may be set by itself, and is not limited here), the measurement of the target terminal device is stopped, and at this time, the first access network device records the number of attempts and the number of failures.

And step 4, finally, the first access network equipment constructs a third virtual grid list according to the RSRP segment numbers, the cell IDs, the trial times and the failure times. In a preset time interval, counting the number of attempts and the number of failures of any terminal device to be switched from the 5G network to the 4G network in a grid in the preset time interval of the current period, and if the preset time interval is 1 day, counting the number in the grid of the current day. The specific process can be as follows: and (3) interoperating original information (namely the number of attempts and the number of failures) from the 5G network to the 4G network, and filling the same-frequency MR fields in a constructed third virtual grid list if the same-frequency MR fields exist in a preset time period (such as 5 seconds, 8 seconds, 10 seconds and the like, wherein the preset time period can be set by a user, and is not limited at this time). And then, the raster records can be found according to the same-frequency MR field information of the table 8, if the corresponding raster records are found, the trial times in the original information are accumulated into the trial times from the 5G network to the 4G network on the same day in the raster records, and the failure times in the original information are accumulated into the failure times from the 5G network to the 4G network on the same day in the raster records. And if the raster record cannot be searched according to the same-frequency MR field information, newly adding the raster record in the third virtual raster list. For convenience of understanding, the third virtual grid list is illustrated below by taking table 9 as an example (taking the preset time interval as 1 day as an example), it should be noted that table 9 only illustrates grid information such as the number of failures and the number of attempts of any terminal device to access one 4G cell (e.g., 4G cell 1) within the preset time interval, actually, 4G cells 2, 4G cells 3, … …, and 4G cell n are still present, and table 9 only illustrates one of the 4G cells (i.e., 4G cell 1).

Table 9: third virtual grid List

ID of 4G cell 1	201
		RSRP segment number corresponding to 4G cell 1	0
Failure times from 5G network to 4G network on the same day	42
		Number of attempts from 5G network to 4G network on the same day	234
Historical 5G network to 4G network failure times	78
		Historical 5G to 4G network attempts	634
……	……

It should be noted that, in some embodiments of the present application, the first access network device may further update the third virtual grid list according to a preset period, so as to delete an invalid grid and reduce the number of redundant grids. It should be further noted that a manner of updating the third virtual grid list by the first access network device according to the preset period is similar to the manner of updating the first virtual grid list by the first access network device according to the preset period, and details are not repeated here.

504. And the target terminal equipment is switched from the 5G network to the 4G network based on the third virtual grid.

After the first access network device constructs a third virtual grid facing the 4G cell, the target terminal device switches the 5G network to the 4G network based on the first virtual grid, and the specific implementation steps may be:

first, the first access network device determines, according to an acquired target MR in a current period (that is, a currently acquired same-frequency MR), a target RSRP segment number and a third target grid in a third virtual grid list corresponding to a target cell ID, where the third target grid includes the target RSRP segment number, the target cell ID, the number of attempts, and the number of failures. That is to say, the first access network device queries, according to the cell ID and RSRP segment number of the 4G cell in the same-frequency MR acquired this time, historical grid information corresponding to the cell ID and the RSRP segment number and grid information in the current period in the third virtual grid list, so as to determine whether the target terminal device is switched from the 5G network to the 4G network. There are three results of the determination, which are set forth below:

first, the first access network device determines the type of the third target grid according to the grid information, it should be noted that the determination principle is similar to that of the first access network device determining the type of the first virtual grid, and details are not repeated here.

Then, the first access network device determines the type of the third target grid according to the grid information, and has three results:

as a result 1, if the first access network device determines that the type of the third target grid is the first type, the target terminal device returns from the 5G network to the 4G network in a blind manner (e.g., returns in an EPS FB manner).

If the first access network device determines that the type of the third target grid is the second type, the first access network device further determines whether the historical switching form of any terminal device connected with the first access network device is switched from the 5G network to the 4G network in a blind mode; if yes, the target terminal equipment returns to the 4G network from the 5G network in a blind mode; if not, the target terminal equipment returns to the 4G network from the 5G network according to the measuring mode.

And 3, if the first access network equipment determines that the type of the third target grid is the third type, the target terminal equipment executes switching according to a preset mode. For example, the first access network device may randomly select a preset percentage (e.g., 5%) of terminal devices to perform handover from the 5G network back to the 4G network based on the measurement mode, where the remaining 95% of the terminal devices do not perform handover, where the target terminal device happens to be at the above 5%, the measurement mode handover is performed, and the target terminal device happens to be at the above 95%, the handover is not performed. For another example, if the first access network device determines that the third virtual grid type is the third type, then the handover is not executed. The preset manner is not limited herein.

505. And the second access network equipment establishes a third connection with the target terminal equipment and establishes a fourth virtual grid facing the 3G cell.

And then, the second access network equipment establishes a third connection with the target terminal equipment and constructs a fourth virtual grid facing the 3G cell. It should be noted that, in some embodiments of the present application, the second access network device may construct the fourth virtual grid facing the 3G cell by:

step 1, second access network equipment acquires an MR periodically reported by target terminal equipment, wherein the MR is obtained by the target terminal equipment through same-frequency periodic measurement, and the MR comprises an RSRP value of a 3G cell.

And step 2, the second access network equipment processes the MR reported periodically, namely, the obtained RSRP values are segmented to obtain RSRP segment numbers, RSRP interval values respectively corresponding to the RSRP segment numbers and cell IDs of 3G cells respectively corresponding to the RSRP segment numbers.

For ease of understanding, the following is illustrated by way of example in Table 10: firstly, the second access network device segments the RSRP value measured in the MR according to a preset segmentation step (in table 10, the segmentation step is still illustrated as 3dB, actually, the segmentation step may be any value set by the user, such as 4dB, 10dB, etc., and is not limited here), since the RSRP value range is [ -156, -31] specified by the protocol, different RSRP interval values, RSRP segment numbers corresponding to the RSRP interval values, and cell IDs of 3G cells corresponding to the RSRP interval values in table 10 can be obtained according to the segmentation form in which the segmentation step is 3 dB. For example, the third column in table 10 may be arranged in the order of the values of the cell IDs from small to large, and table 10 indicates that the cell IDs corresponding to the first six RSRP intervals are 007, 008, 009, and 010, respectively.

Table 10: corresponding relation among RSRP interval value, RSRP segment number and cell ID of 3G cell

RSRP interval value	RSRP segment number	Cell ID for 3G cells
			[-156,-153)	0	007
[-153,-150)	1	007
			[-150,-147)	2	007
[-147,-144)	3	008
			[-144,-141)	4	009
[-141,-138)	5	010
			……	……	……

Because the MR acquired by the second access network device is periodic, based on the acquired MR and the table 10, the second access network device will also automatically generate a same-frequency MR field information table shown in table 11, where the table 11 includes MR reporting time, cell IDs of each 3G cell, and RSRP segment numbers corresponding to the cell IDs. It should be noted that the second access network device may automatically classify, according to the segmented RSRP interval value, the RSRP segment number to which the cell ID of each 3G cell belongs, as shown in table 11 below. This is a table automatically generated according to the MR reported by the target terminal device (since the RSRP segment number is already better by the second access network device, table 11 only needs to be automatically generated according to the algorithm at this time).

Table 11: same frequency MR field information table

MR reporting time	2019.09.16 12:00
		ID of 3G cell 11	007
RSRP segment number of 3G cell 11	0、1、2
		ID of 3G cell 12	008
RSRP segment number of 3G cell 12	3
		ID of 3G cell 13	009
RSRP segment number of 3G cell 13	4
		ID of 5G cell 14	010
RSRP segment number of 3G cell 14	5
		……	……

Step 3, after that, the second access network device counts the number of attempts and the number of failures of any terminal device establishing connection with the second access network device to switch from the 4G network to the 3G network within a preset time interval (for example, 24 hours, 48 hours, 72 hours, where the preset time interval may be set by itself, and is not limited herein). In some embodiments of the present application, the number of attempts and the number of failures of the terminal device to switch from the 4G network to the 3G network in two scenarios need to be counted:

Counting the failure times: and in the process that the target terminal equipment executes the switching from the 4G network to the 3G network, if the second access network equipment acquires the switching failure message returned by the target terminal equipment, recording the failure times once.

Scenario 2, measurement timeout scenario.

When the target terminal device starts to perform a compression mode measurement on the UMTS neighbor area, if the second access network device does not receive the reported MR within a preset time (for example, within a time of 20 seconds, the preset time may be set by itself, and is not limited here), the measurement on the target terminal device is stopped, and at this time, the second access network device records the number of attempts and the number of failures.

And 4, finally, the second access network equipment constructs a fourth virtual grid list according to the RSRP segment numbers, the cell IDs, the trial times and the failure times. In a preset time interval, counting the number of attempts and the number of failures of any terminal device to switch from the 4G network to the 3G network in a grid in the preset time interval of the current period, and if the preset time interval is 1 day, counting the number in the grid of the current day. The specific process can be as follows: and interoperating original information (namely the trial times and the failure times) from the 4G network to the 3G network, and if the same-frequency MR fields in a preset time period (such as 5 seconds, 8 seconds, 10 seconds and the like, wherein the preset time period can be set by a user, and is not limited at this time) exist, filling the same-frequency MR fields into a fourth constructed virtual grid list. Then, the raster record can be found according to the same-frequency MR field information of table 11, and if the corresponding raster record is found, the number of attempts in the original information is accumulated into the number of attempts from the 4G network to the 3G network in the raster record on the same day, and the number of failures in the original information is accumulated into the number of failures from the 4G network to the 3G network in the raster record on the same day. And if the raster record cannot be searched according to the same-frequency MR field information, newly adding the raster record in the fourth virtual raster list. For convenience of understanding, the fourth virtual grid list is illustrated below by taking table 12 as an example (taking the preset time interval as 1 day as an example), it should be noted that table 12 only illustrates grid information such as the number of failures and the number of attempts of any terminal device to access one 3G cell (e.g., 3G cell 11) within the preset time interval, and actually, there are 3G cells 12, 3G cells 13, … …, and 5G cell 1n, and table 12 only illustrates one of the 3G cells (i.e., 3G cell 11).

Table 12: fourth virtual raster List

ID of 3G cell 11	007
		RSRP segment number corresponding to 3G cell 11	0、1、2
Failure times from 4G network to 3G network on the same day	24
		Number of attempts from 4G network to 3G network on the same day	356
Historical 4G network to 3G network failure times	52
		Historical 4G network to 3G network attempts	687
……	……

It should be noted that, in some embodiments of the present application, the second access network device may further update the fourth virtual grid list according to a preset period, so as to delete an invalid grid and reduce the number of redundant grids. It should be further noted that the manner in which the second access network device updates the fourth virtual grid list according to the preset period is similar to the manner in which the first access network device updates the first virtual grid list according to the preset period, and details are not repeated here.

506. And the target terminal equipment is switched from the 4G network to the 3G network based on the fourth virtual grid.

After the second access network device constructs a fourth virtual grid facing the 3G cell, the target terminal device may switch from the 4G network to the 3G network based on the fourth virtual grid. The specific implementation steps can be as follows:

first, the second access network device determines, according to the obtained target MR of the current period (i.e., the obtained same-frequency MR of this time), a fourth target grid in a fourth virtual grid list corresponding to a target cell ID and a target RSRP segment number, where the fourth target grid includes the target RSRP segment number, the target cell ID, the number of attempts, and the number of failures. That is to say, the second access network device queries, according to the cell ID and the RSRP segment number of the 3G cell in the same-frequency MR acquired this time, historical grid information corresponding to the cell ID and the RSRP segment number and grid information in the current period in the fourth virtual grid list, so as to determine whether the target terminal device is switched from the 4G network to the 3G network. There are three results of the determination, which are set forth below:

first, the second access network device determines the type of the fourth target grid according to the grid information, it should be noted that the determination principle is similar to that of the first access network device determining the type of the first virtual grid, and details are not repeated here.

Then, the second access network device determines the type of the fourth target grid according to the grid information, and has three results:

and as a result 1, if the second access network device determines that the type of the fourth virtual grid is the first type, the target terminal device is switched from the 4G network to the 3G network in a blind manner.

And if the second access network device determines that the type of the fourth target grid is the second type, the second access network device further determines whether the historical switching form of any terminal device connected with the second access network device is switched from the 4G network to the 3G network in a blind mode. If so, the target terminal equipment is switched from the 4G network to the 3G network in a blind mode; and if not, the target terminal equipment is switched from the 4G network to the 3G network according to the measuring mode.

And if the second access network device determines that the type of the fourth target grid is the third type, the second access network device further determines whether the historical switching form of any terminal device connected with the second access network device is switched from the 4G network to the 3G network in a blind manner. The target device performs handover in a preset manner, for example, the second access network device may randomly select a preset percentage (e.g., 5%) of terminal devices to perform handover from the 4G network to the 3G network based on the measurement manner, where the remaining 95% of the terminal devices do not perform handover, where the target terminal device is exactly at the above 5%, the measurement manner handover is performed, and the target terminal device is exactly at the above 95%, the handover is not performed. For another example, if the second access network device determines that the fourth virtual grid type is the third type, then the handover is not executed. The preset manner is not limited herein.

507. The third access network equipment carries the voice service.

508. And after the voice service is finished, the third access network equipment sends a switching request message to the second access network equipment so that the target terminal equipment returns to the 4G network through switching/redirection.

509. And the second access network equipment analyzes the switching request message.

510. The second access network device constructs a fifth virtual grid facing the 5G cell.

After the second access network device identifies that the target terminal device is a terminal device supporting a 5G network, a fifth virtual grid facing the 5G cell is constructed. The second access network device constructing a fifth virtual grid facing the 5G cell may include: firstly, second access network equipment acquires an MR reported periodically, wherein the MR is obtained by target terminal equipment through same-frequency periodic measurement, and the MR comprises an RSRP value of a 5G cell; then, the second access network equipment segments the RSRP value to obtain each RSRP segment number, RSRP interval values respectively corresponding to each RSRP segment number and cell IDs of 5G cells respectively corresponding to each RSRP segment number; in addition, the second access network device also counts the number of attempts and the number of failures of any terminal device which establishes connection with the second access network device to switch from the 4G network to the 5G network within a preset time interval; and finally, the second access network equipment constructs a fifth virtual grid list according to the RSRP segment numbers, the cell IDs, the trial times and the failure times. It should be noted that, in this embodiment of the present application, a process of constructing the fifth virtual grid facing the 5G cell by the second access network device is similar to a process of constructing the second virtual grid facing the 5G cell by the second access network device, and details are not repeated here.

It should be further noted that, in some embodiments of the present application, the second access network device may also update the fifth virtual raster list according to a preset period, where an update manner of the fifth virtual raster list is similar to that of the first access network device updating the first virtual raster list according to the preset period, and details are not repeated here.

511. And the target terminal equipment returns to the 5G network through switching.

After the second access network device constructs the fifth virtual grid facing the 5G cell, the target terminal device may switch from the 4G network back to the 5G network based on the fifth virtual grid.

In some embodiments of the present application, the target terminal device may also determine the type of the fifth virtual grid in advance based on a manner that the fifth virtual grid is switched from the 4G network to the 5G network, and specifically may be: the second access network equipment determines a target RSRP segment number and a fifth target grid in the fifth virtual grid list corresponding to a target cell ID according to the acquired target MR in the current period, wherein the fifth target grid comprises the target RSRP segment number, the target cell ID, the attempt times and the failure times; then, the second access network device judges the type of the fifth target grid; and if the second access network device determines that the type of the fifth target grid is the first type, the target terminal device is switched from the 4G network to the 5G network. If the second access network device determines that the type of the fifth target grid is the second type, the second access network device judges whether the historical switching form of any terminal device which establishes connection with the second access network device is switched from the 4G network to the 5G network in a blind mode; if so, the target terminal equipment is switched from the 4G network to the 5G network in a blind mode; and if not, the target terminal equipment is switched from the 4G network to the 5G network according to the measuring mode. And if the second access network equipment determines that the type of the fifth target grid is the third type, the target equipment executes switching according to a preset mode.

It should be noted that how the second access network device determines the type of the fifth target grid and the subsequent operation process according to the grid information are similar to how the second access network device determines the type of the second target grid and the subsequent operation process (i.e., operations corresponding to result 1, result 2, and result 3, respectively) according to the grid information, and details thereof are omitted here.

512. The first access network device establishes a second connection with the target terminal device.

It should be noted that, in the embodiment of the present application, the steps 507-512 are similar to the steps 405-410 in the embodiment corresponding to fig. 4, and are not described herein again.

In this embodiment of the application, the first access network device first reduces access delay by constructing a third virtual grid facing the 4G cell, that is, the target terminal device is switched from the 5G network to the 4G network based on the third virtual grid (e.g., in an EPS FB manner), and then, the second access network device reconstructs a fourth virtual grid facing the 3G cell to further reduce access delay, that is, the target terminal device is switched from the 4G network to the 3G network based on the fourth virtual grid (e.g., in a CSFB manner), and the second access network device reduces return delay by constructing a fifth virtual grid facing the 5G cell again, so that total delay of interoperation between different access network devices is reduced, and user experience is improved.

Referring to fig. 6, in an embodiment of a data processing apparatus 600 provided in this application, the data processing apparatus may be an access network device (e.g., may be a first access network device, a second access network device, or a third access network device in the foregoing embodiments of the application), or a chip system located on different access network devices, and the data processing apparatus may be configured to perform steps that are respectively and correspondingly performed by different access network devices in any of the embodiments shown in fig. 2 to 5, for example, if the data processing apparatus is a first access network device (e.g., an NG-RAN), the data processing apparatus is configured to perform steps that are correspondingly performed by the first access network device in any of the embodiments shown in fig. 2 to 5; if the data processing apparatus is a second access network device (e.g., eNodeB), the data processing apparatus is configured to perform steps correspondingly performed by the second access network device in any of the embodiments shown in fig. 2-5; if the data processing apparatus is a third access network device (e.g., an RNC or a BSC), the data processing apparatus is configured to execute steps correspondingly executed by the third access network device in any embodiment shown in fig. 2 to 5, which may specifically refer to relevant descriptions in the foregoing method embodiments and is not described herein again.

The data processing apparatus 600 comprises: a processor 601, a memory 602, and an input-output device 603.

In one possible implementation, the processor 601, the memory 602, and the input/output device 603 are respectively connected to a bus, and the memory stores computer instructions.

In one implementation, data processing apparatus 600 may include more or fewer components than those shown in FIG. 6, which are merely illustrative and not limiting.

Referring to fig. 7, an embodiment of the present application further provides a communication system, including: a first access network device, a second access network device, and a third access network device.

The first access network device may include the data processing apparatus shown in fig. 6 (when the data processing apparatus is used as the first access network device), and is configured to perform all or part of the steps performed by the first access network device in any of the embodiments shown in fig. 2 to 5.

The second access network device may include the data processing apparatus shown in fig. 6 (when the data processing apparatus is used as the second access network device), and is configured to perform all or part of the steps performed by the second access network device in any of the embodiments shown in fig. 2 to 5.

The third access network device may include the data processing apparatus shown in fig. 6 (when the data processing apparatus is used as the third access network device), and is configured to perform all or part of the steps performed by the third access network device in any of the embodiments shown in fig. 2 to 5.

In a possible implementation, the communication system may further include a target terminal device (not shown in fig. 7) configured to perform all or part of the steps performed by the target terminal device in any of the implementations shown in fig. 2 to 5.

Embodiments of the present application further provide a chip system, which includes a processor, and is configured to enable a data processing apparatus to implement the functions referred to in the foregoing aspects, for example, to transmit or process data and/or information referred to in the foregoing methods. In one possible design, the system-on-chip further includes a memory for storing necessary program instructions and data. The chip system may be formed by a chip, or may include a chip and other discrete devices.

In another possible design, when the data processing apparatus is a chip in a first access network device, a second access network device, or a third access network device, the chip includes: a processing unit, which may be for example a processor, and a communication unit, which may be for example an input/output interface, a pin or a circuit, etc. The processing unit may execute computer-executable instructions stored by the storage unit, so as to cause a chip in the first access network device, the second access network device, or the third access network device to perform the steps of the method, which are performed by the first access network device, the second access network device, or the third access network device in any one of the embodiments of fig. 2 to 5, described above. Optionally, the storage unit is a storage unit in the chip, such as a register, a cache, and the like, and the storage unit may also be a storage unit located outside the chip in the first access network device, the second access network device, or the third access network device, and the like, such as a read-only memory (ROM) or another type of static storage device that can store static information and instructions, a Random Access Memory (RAM), and the like.

The embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a computer, implements the method flow related to the data processing apparatus in any of the above method embodiments. Correspondingly, the computer may be the data processing apparatus described above. The data processing device comprises first access network equipment, second access network equipment or third access network equipment.

The present invention also provides a computer program or a computer program product including a computer program, which, when executed on a computer, causes the computer to implement the method flows associated with the data processing apparatus in any of the above method embodiments. Correspondingly, the computer may be the data processing apparatus described above.

In the various embodiments of fig. 2-5 described above, may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product.

The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that a computer can store or a data storage device, such as a server, a data center, etc., that is integrated with one or more available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

It should be understood that the Processor referred to in this Application may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

It should also be understood that the number of processors in the present application may be one or more, and may be specifically adjusted according to an actual application scenario, and this is merely an example and is not limited herein. The number of the memories in the embodiment of the present application may be one or multiple, and may be specifically adjusted according to an actual application scenario, and this is merely an exemplary illustration and is not limited.

It should be further noted that, when the data processing apparatus includes a processor (or a processing unit) and a memory, the processor in this application may be integrated with the memory, or the processor and the memory may be connected through an interface, which may be specifically adjusted according to an actual application scenario, and is not limited.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or other devices) to execute all or part of the steps of the method described in the embodiments of fig. 2 to 5 of the present application.

It will be appreciated that the storage media or memories referred to in this application may comprise volatile memory or non-volatile memory, or may comprise both volatile and non-volatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of example, but not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic random access memory (Synchronous DRAM, SDRAM), Double Data Rate Synchronous Dynamic random access memory (DDR SDRAM), Enhanced Synchronous SDRAM (ESDRAM), Synchronous link SDRAM (SLDRAM), and Direct Rambus RAM (DR RAM).

It should be noted that the memory described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for interoperation between different access network devices is characterized by comprising the following steps:

the method comprises the steps that first access network equipment establishes first connection with target terminal equipment, wherein the first access network equipment comprises access network equipment supporting a 5G network;

if the NR network deploys VONR, the first access network equipment responds to the voice service initiated by the target terminal equipment;

in response to a triggering instruction, the first access network device constructs a first virtual grid facing the 3G cell and disconnects the first connection, such that the voice traffic is returned from the 5G network to the 3G network based on the first virtual grid, the first virtual grid facing the 3G cell is constructed by the first access network equipment according to each RSRP segment number, each cell ID, trial times and failure times of the 3G cell respectively corresponding to each RSRP segment number, the RSRP segment numbers are obtained by the first access network equipment according to the RSRP value of the 3G cell, the RSRP value is included in an MR, and the number of attempts and the number of failures are the number of attempts and the number of failures for switching from the 5G network to the 3G network by any terminal equipment which establishes connection with the first access network equipment within a preset time interval by the first access network equipment;

when the voice service is finished, the first access network equipment reestablishes the second connection with the target terminal equipment, the second connection is triggered by a second virtual grid towards the 5G cell constructed by a second access network device, the step of the second access network device constructing the 5G-oriented cell is triggered by a handover request message sent by a third access network device to the second access network device, the handover request message is used for instructing the target terminal device to be handed over from the 3G network to a 4G network, the switching request message carries private information, the private information is used for indicating the target terminal equipment as the terminal equipment supporting the 5G network, the second access network device comprises an access network device supporting a 4G network, and the third access network device comprises an access network device supporting a 3G network.

2. The method of claim 1, wherein the triggering instruction comprises:

the signal quality of the 5G network in the area where the target terminal device is located is weaker than that of the 3G network, and VOLTE is not deployed in the LTE network.

3. The method of claim 1, wherein the first access network device constructing a first virtual grid for 3G cells comprises:

the first access network equipment acquires an MR which is reported periodically, the MR is obtained by the target terminal equipment through the measurement of the same frequency period, and the MR comprises an RSRP value of the 3G cell;

the first access network equipment segments the RSRP value to obtain each RSRP segment number, RSRP interval values respectively corresponding to each RSRP segment number and cell IDs of 3G cells respectively corresponding to each RSRP segment number;

the first access network equipment counts the number of attempts and the number of failures of any terminal equipment which establishes connection with the first access network equipment to switch from the 5G network to the 3G network within a preset time interval;

and the first access network equipment constructs a first virtual raster list according to the RSRP segment numbers, the cell IDs, the trial times and the failure times.

4. The method of claim 3, further comprising:

and the first access network equipment updates the first virtual raster list according to a preset period.

5. The method of claim 3, wherein the returning of the voice traffic from the 5G network to the 3G network based on the first virtual grid comprises:

the first access network equipment determines a target RSRP segment number and a first target grid in the first virtual grid list corresponding to a target cell ID according to the obtained target MR of the current period, wherein the first target grid comprises the target RSRP segment number, the target cell ID, the attempt times and the failure times;

the first access network equipment judges the type of the first target grid;

and if the first access network equipment determines that the type of the first target grid is the first type, returning the voice service from the 5G network to the 3G network in a blind mode.

6. The method of claim 5, further comprising:

if the first access network equipment determines that the type of the first target grid is the second type, the first access network equipment judges whether the historical voice service is returned to the 3G network from the 5G network in a blind mode;

if yes, the voice service is returned to the 3G network from the 5G network in a blind mode;

and if not, returning the voice service to the 3G network from the 5G network according to a measuring mode.

7. The method according to any one of claims 5-6, further comprising:

and if the first access network equipment determines that the type of the first target grid is the third type, the voice service executes switching according to a preset mode.

8. A method for interoperation between different access network devices is characterized by comprising the following steps:

when the voice service is finished, the second access network equipment acquires the switching request message sent by the third access network equipment, the handover request message is used for instructing the target terminal device to switch from the 3G network to the 4G network, the switching request message carries private information, the private information is used for indicating that the target terminal equipment is the terminal equipment supporting the 5G network, the voice traffic is voice traffic returned by the 5G network to the 3G network based on a first virtual grid, the first virtual grid is constructed by the first access network device towards the 3G cell in response to a trigger, the first access network device comprises an access network device supporting the 5G network, the second access network device comprises an access network device supporting the 4G network, and the third access network device comprises an access network device supporting the 3G network;

the second access network equipment identifies the target terminal equipment as the terminal equipment supporting the 5G network according to the private information;

the second access network device constructs a second virtual grid facing a 5G cell, so that the target terminal device is switched from the 4G network to the 5G network based on the second virtual grid, the second virtual grid facing the 5G cell is constructed by the second access network device according to RSRP segment numbers, cell IDs of the 5G cells respectively corresponding to the RSRP segment numbers, attempt times, and failure times, the RSRP segment numbers are obtained by the second access network device according to RSRP values of the 5G cells, the RSRP values are included in the MR, and the attempt times and the failure times are the attempt times and the failure times of switching from the 4G network to the 5G network by any terminal device establishing connection with the second access network device within a preset time interval.

9. The method of claim 8, wherein the triggering instructions comprise:

10. The method of claim 8, wherein the second access network device constructing a second virtual grid oriented towards a 5G cell comprises:

the second access network equipment acquires an MR which is reported periodically, the MR is obtained by the target terminal equipment through the measurement of the same frequency period, and the MR comprises an RSRP value of the 5G cell;

the second access network equipment segments the RSRP value to obtain each RSRP segment number, RSRP interval values respectively corresponding to each RSRP segment number and cell IDs of the 5G cells respectively corresponding to each RSRP segment number;

the second access network equipment counts the number of attempts and the number of failures of any terminal equipment which establishes connection with the second access network equipment to switch from the 4G network to the 5G network within a preset time interval;

and the second access network equipment constructs a second virtual raster list according to the RSRP segment numbers, the cell IDs, the trial times and the failure times.

11. The method of claim 10, further comprising:

and the second access network equipment updates the second virtual raster list according to a preset period.

12. The method of claim 10, wherein switching from a 4G network to a 5G network by the target terminal device based on the second virtual grid comprises:

the second access network device determines a target RSRP segment number and a second target grid in the second virtual grid list corresponding to a target cell ID according to the obtained target MR of the current period, wherein the second target grid comprises the target RSRP segment number, the target cell ID, the attempt times and the failure times;

the second access network equipment judges the type of the second target grid;

and if the second access network equipment determines that the type of the second target grid is the first type, the target terminal equipment is switched from the 4G network to the 5G network in a blind mode.

13. The method of claim 12, further comprising:

if the second access network device determines that the type of the second target grid is the second type, the second access network device determines whether the historical switching form of any terminal device connected with the second access network device is switched from the 4G network to the 5G network in a blind mode;

if yes, the target terminal equipment is switched from the 4G network to the 5G network in a blind mode;

and if not, the target terminal equipment is switched from the 4G network to the 5G network according to a measuring mode.

14. The method according to any one of claims 12-13, further comprising:

and if the second access network equipment determines that the type of the second target grid is the third type, the target equipment executes switching according to a preset mode.

15. A method for interoperation between different access network devices is characterized by comprising the following steps:

if the NR network does not deploy VONR and the LTE network does not deploy VOLTE, when the target terminal device initiates a voice service, the first access network device constructs a third virtual grid facing a 4G cell from a 5G network to a 4G network based on the third virtual grid, and disconnects the first connection, so that the target terminal device is switched from the 4G network to the 4G network based on the third virtual grid, and is switched from the 4G network to a 3G network based on a fourth virtual grid, so that the target terminal device initiates the voice service in the 3G network, the fourth virtual grid is constructed by the second access network device facing the 3G cell, the third virtual grid facing the 4G cell is constructed by the first access network device according to RSRP segment numbers, cell IDs, attempt times, and failure times of the 4G cells respectively corresponding to the RSRP segment numbers, the RSRP segment numbers being obtained by the first access network device according to RSRP values of the 4G cells, the RSRP value is included in the MR, the number of attempts and the number of failures are the number of attempts and the number of failures for any terminal device, which establishes a connection with the first access network device, to switch from the 5G network to the 4G network within a preset time interval by the first access network device, and the second access network device includes an access network device supporting the 4G network;

when the voice service is finished, the first access network device reestablishes a second connection with the target terminal device, the second connection is triggered by a fifth virtual grid which is constructed by the second access network device and faces a 5G cell, the step of constructing the cell which faces the 5G cell by the second access network device is triggered by a handover request message which is sent to the second access network device by a third access network device, the handover request message is used for indicating that the target terminal device is switched from the 3G network to the 4G network, the handover request message carries private information, the private information is used for indicating that the target terminal device is a terminal device supporting the 5G network, and the third access network device includes an access network device supporting the 3G network.

16. The method of claim 15, wherein the first access network device constructing a third virtual grid for the 4G cell comprises:

the first access network equipment acquires an MR which is reported periodically, the MR is obtained by the target terminal equipment through the measurement of the same frequency period, and the MR comprises an RSRP value of the 4G cell;

the first access network equipment segments the RSRP value to obtain each RSRP segment number, RSRP interval values respectively corresponding to each RSRP segment number and cell IDs of 4G cells respectively corresponding to each RSRP segment number;

the first access network equipment counts the number of attempts and the number of failures of any terminal equipment which establishes connection with the first access network equipment to switch from a 5G network to a 4G network within a preset time interval;

and the first access network equipment constructs a third virtual grid list according to the RSRP segment numbers, the cell IDs, the trial times and the failure times.

17. The method of claim 16, further comprising:

and the first access network equipment updates the third virtual raster list according to a preset period.

18. The method of claim 16, wherein switching from a 5G network to a 4G network by the target terminal device based on the third virtual grid comprises:

the first access network device determines a target RSRP segment number and a third target grid in the third virtual grid list corresponding to a target cell ID according to the obtained target MR of the current period, wherein the third target grid comprises the target RSRP segment number, the target cell ID, the attempt times and the failure times;

the first access network equipment judges the type of the third target grid;

and if the first access network equipment determines that the type of the third target grid is the first type, the target terminal equipment is switched from the 5G network to the 4G network in a blind mode.

19. The method of claim 18, further comprising:

if the first access network device determines that the type of the third target grid is the second type, the first access network device determines whether the historical switching form of any terminal device which establishes connection with the first access network device is switched from the 5G network to the 4G network in a blind mode;

if yes, the target terminal equipment is switched from the 5G network to the 4G network in a blind mode;

and if not, the target terminal equipment is switched from the 5G network to the 4G network according to a measuring mode.

20. The method according to any one of claims 18-19, further comprising:

and if the first access network equipment determines that the third target grid is of the third type, the target terminal equipment executes switching according to a preset mode.

21. A method for interoperation between different access network devices is characterized by comprising the following steps:

if the NR network does not deploy VONR and the LTE network does not deploy VOLTE, when a target terminal device initiates a voice service, a second access network device establishes a third connection with the target terminal device, where the third connection is triggered by a third virtual grid oriented to a 4G cell, which is constructed by a first access network device, the first access network device includes an access network device supporting a 5G network, and the second access network device includes an access network device supporting a 4G network;

the second access network device constructs a fourth virtual grid facing the 3G cell, so that the target terminal device is switched from the 4G network to the 3G network based on the fourth virtual grid, and the target terminal device initiates the voice service in the 3G network, the fourth virtual grid facing the 3G cell is constructed by the second access network device according to each RSRP segment number, each cell ID, the number of attempts, and the number of failures of the 3G cell respectively corresponding to each RSRP segment number, the RSRP segment numbers are obtained by the second access network equipment according to the RSRP value of the 3G cell, the RSRP value is included in the MR, and the number of attempts and the number of failures are the number of attempts and the number of failures for the second access network device to switch from the 4G network to the 3G network by any terminal device which establishes connection with the second access network device within a preset time interval;

when the voice service is finished, the second access network device obtains a handover request message sent by a third access network device, where the handover request message is used to indicate that the target terminal device is handed over from the 3G network to the 4G network, the handover request message carries private information, the private information is used to indicate that the target terminal device is a terminal device supporting the 5G network, and the third access network device includes an access network device supporting the 3G network;

and the second access network equipment constructs a fifth virtual grid facing the 5G cell, so that the target terminal equipment is switched from the 4G network to the 5G network based on the fifth virtual grid.

22. The method of claim 21, wherein the second access network device constructing a fourth virtual grid for 3G cells comprises:

the second access network equipment acquires an MR which is reported periodically, the MR is obtained by the target terminal equipment through the measurement of the same frequency period, and the MR comprises an RSRP value of the 3G cell;

the second access network equipment segments the RSRP value to obtain each RSRP segment number, RSRP interval values respectively corresponding to each RSRP segment number and cell IDs of the 3G cells respectively corresponding to each RSRP segment number;

the second access network equipment counts the number of attempts and the number of failures of any terminal equipment which establishes connection with the second access network equipment to switch from the 4G network to the 3G network within a preset time interval;

and the second access network equipment constructs a fourth virtual grid list according to the RSRP segment numbers, the cell IDs, the trial times and the failure times.

23. The method of claim 22, further comprising:

and the second access network equipment updates the fourth virtual raster list according to a preset period.

24. The method of claim 22, wherein switching from a 4G network to a 3G network by the target terminal device based on the fourth virtual grid comprises:

the second access network device determines a target RSRP segment number and a fourth target grid in the fourth virtual grid list corresponding to a target cell ID according to the obtained target MR of the current period, wherein the fourth target grid comprises the target RSRP segment number, the target cell ID, the attempt times and the failure times;

the second access network equipment judges the type of the fourth target grid;

and if the second access network equipment determines that the type of the fourth target grid is the first type, the target terminal equipment is switched from the 4G network to the 3G network in a blind mode.

25. The method of claim 24, further comprising:

if the second access network device determines that the type of the fourth target grid is the second type, the second access network device determines whether the historical switching form of any terminal device connected with the second access network device is switched from the 4G network to the 3G network in a blind manner;

if yes, the target terminal equipment is switched from the 4G network to the 3G network in a blind mode;

and if not, the target terminal equipment is switched from the 4G network to the 3G network according to a measuring mode.

26. The method of claim 24, further comprising:

and if the second access network equipment determines that the type of the fourth target grid is the third type, the target equipment executes switching according to a preset mode.

27. The method of any of claims 21-26, wherein constructing a fifth virtual grid for a 5G cell by the second access network device comprises:

and the second access network equipment constructs a fifth virtual grid list according to the RSRP segment numbers, the cell IDs, the trial times and the failure times.

28. The method of claim 27, further comprising:

and the second access network equipment updates the fifth virtual grid list according to a preset period.

29. The method of claim 27, wherein the target terminal device switching from the 4G network to the 5G network based on the fifth virtual grid comprises:

the second access network device determines a target RSRP segment number and a fifth target grid in the fourth virtual grid list corresponding to a target cell ID according to the obtained target MR of the current period, wherein the fifth target grid comprises the target RSRP segment number, the target cell ID, the attempt times and the failure times;

the second access network equipment judges the type of the fifth target grid;

and if the second access network device determines that the type of the fifth target grid is the first type, the target terminal device is switched from the 4G network to the 5G network in a blind manner.

30. The method of claim 29, further comprising:

if the second access network device determines that the type of the fifth target grid is the second type, the second access network device determines whether the historical switching form of any terminal device connected with the second access network device is switched from the 4G network to the 5G network in a blind manner;

31. The method of claim 29, further comprising:

and if the second access network device determines that the type of the fifth target grid is the third type, the target device performs switching according to a preset mode.

32. A data processing apparatus, comprising: a processor and a memory;

the memory is used for storing programs;

the processor is configured to execute the program to implement the method according to any one of claims 1-7.

33. A data processing apparatus, comprising: a processor and a memory;

the memory is used for storing programs;

the processor is configured to execute the program to implement the method according to any one of claims 8-14.

34. A data processing apparatus, comprising: a processor and a memory;

the memory is used for storing programs;

the processor is configured to execute the program to implement the method of any one of claims 15-20.

35. A data processing apparatus, comprising: a processor and a memory;

the memory is used for storing programs;

the processor is configured to execute the program to implement the method according to any of claims 21-31.

36. A communication system, comprising: the access network comprises a first access network device, a second access network device and a third access network device;

the first access network device for implementing the method according to any one of claims 1-7;

the second access network device for implementing the method according to any of claims 8-14;

and the third access network equipment is used for initiating a voice call to the target terminal equipment and sending a switching request message to the second access network equipment when the voice call is finished.

37. A communication system, comprising: the access network comprises a first access network device, a second access network device and a third access network device;

the first access network device for implementing the method of any one of claims 15-20;

the second access network device for implementing the method according to any of claims 21-31;

38. A computer-readable storage medium comprising instructions that, when executed on a computer, cause the computer to perform the method of any of claims 1-31.

39. A data processing apparatus comprising a processor and a memory, wherein the processor is coupled to the memory for reading and executing instructions stored in the memory to implement the steps of the method according to any one of claims 1 to 31.

40. The apparatus of claim 39, wherein the data processing apparatus is a chip or a system on a chip.