WO2021057770A1

WO2021057770A1 - Method, apparatus and system for interoperation among different access network devices

Info

Publication number: WO2021057770A1
Application number: PCT/CN2020/117045
Authority: WO
Inventors: 程严; 李明; 吕玖有; 罗茜; 唐发建
Original assignee: 华为技术有限公司
Priority date: 2019-09-24
Filing date: 2020-09-23
Publication date: 2021-04-01
Also published as: CN112637912B; CN112637912A

Abstract

Disclosed in the embodiments of the present application are a method, apparatus and system for interoperation among different access network devices. The method comprises: a first access network device establishes a first connection with a target terminal device; the first access network device builds a first virtual grid for 3G cells in response to a voice service initiated by the target terminal device, in this case, the voice service being handed over from a 5G network to a 3G network; when the voice service ends on a 3G network side, a third access network device sends a handover request message to a second access network device, the second access network device builds a second virtual grid for 5G cells in response to the handover request message, and the first access network device reestablishes a second connection with the target terminal device. In implementations of the present application, the first access network device reduces access delay by building the first virtual grid for 3G cells, and the second access network device reduces return delay by building the second virtual grid for 5G cells, thereby improving the user experience.

Description

Method, device and system for interoperating between different access network equipment

This application requires the priority of a Chinese patent application filed with the Chinese Patent Office on September 24, 2019, the application number is 201910907009.3, and the application name is "a method, device and system for interoperating between different access network equipment" , Its entire content is incorporated into this application by reference.

Technical field

This application relates to the field of communication technology, and in particular to a method, device, and system for interoperating between different access network devices.

Background technique

At present, the New Radio (NR) defines two networking modes in the standard, namely independent networking (Standalone, SA) and non-independent networking (Non-Standalone, NSA).

Among them, in the SA scenario, if the terminal device (the terminal device is a terminal device supporting 5G network) has a voice service, it can be carried in three ways: Method 1. If NR deploys VONR, the voice service is established on NR, Due to the high frequency band used by NR (C-band and above), the overall coverage of the cell is limited, and it is difficult to form continuous coverage in the initial stage of NR network construction. This results in coverage continuity and signal quality weaker than existing LTE networks and UMTS networks. If the NR coverage is limited (that is, when the coverage is weak), the terminal device can switch to the 3G network by switching to the VoLTE of the 4G network or by using the Single Radio Voice Call Continuity (SRVCC) to switch to the 3G network (R16 standard already supports ) Initiate voice services; Method 2, if NR has not deployed VONR and LTE network has deployed VOLTE, at this time terminal equipment can fall back to the 4G network to initiate voice services by means of Evolved Packet System Fallback (EPS FB) Method 3: If VONR is not deployed in NR and VOLTE is not deployed in the LTE network, the terminal device will first fall back to the 4G network through EPS FB, and then fall back to 3G/CSFB through Circuit Switched Fallback (CSFB). 2G network, and finally the terminal equipment initiates the voice service on the 3G/2G network.

However, in the above method 1, if the terminal device is switched to the 3G network through the SRVCC method, the access delay of this switching method is about 2 seconds. In the above method 3, the terminal device first passes the EPS FB The method falls back to the 4G network and then to the 3G/2G network through CSFB. The total access delay of this switching method is about 8 seconds. Both of these two switching methods have a large access delay; in addition, in methods 1 and 3, after the terminal device ends the voice service and switches from the 3G network to the 4G network side, the access network equipment on the 4G network side cannot perceive The terminal device is a terminal device that supports the 5G network, so the access network device on the 4G network side will not perform 4G network to 5G network switching or redirection for the terminal device. The terminal device can only be used when it is idle. The user returns to the 5G network by reselection. At this time, the return delay for the terminal device to return 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 PS service to end before the terminal device can return. To the idle state to allow the user to perform a reselection operation, the terminal device will hang on the 4G network side for a long time, resulting in a longer return delay.

Summary of the invention

The embodiments of the present invention provide a method, device, and system for interoperating between different access network devices, which are used to reduce the access delay of a terminal device being switched from a 5G network to a 3G network, and to reduce the terminal device being switched from a 4G network. The return delay of returning to the 5G network improves the user experience.

In view of this, the first aspect of the embodiments of the present application provides a method for interoperating between different access network devices, including: the first access network device establishes a first connection with the target terminal device; if the NR network is deployed VONR, the first access network device responds to the voice service initiated by the target terminal device; in response to the trigger instruction, the first access network device constructs a first virtual grid facing the 3G cell and disconnects all The first connection, so that the voice service is returned from the 5G network to the 3G network based on the first virtual grid; when the voice service ends, the first access network device re-establishes the connection with the target terminal The second connection of the device, the second connection is triggered by a second virtual grid oriented to the 5G cell constructed by the second access network device, and the step of constructing the second access network device oriented to the 5G cell is determined by the third Triggered by a handover request message sent by the access network device to the second access network device, 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 indicate that the target terminal device is a terminal device supporting the 5G network.

In the embodiment of the present application, the first access network device reduces the access delay by constructing a first virtual grid oriented to the 3G cell, even if the voice service of the target terminal device is directly used by the 5G based on the constructed first virtual grid. The network is switched to the 3G network (for example, through the SRVCC method), and the second access network device again reduces the return delay by constructing a second virtual grid oriented to the 5G cell, thereby reducing the number of different access network devices. The total time delay for interoperability improves the user experience.

With reference to the first aspect of the embodiments of the present application, in the first implementation manner of the first aspect of the embodiments 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 all the signals. The signal quality of the 3G network and VOLTE is not deployed in the LTE network.

With reference to the first aspect of the embodiments of the present application and the first implementation manner of the first aspect of the embodiments of the present application, in the second implementation manner of the first aspect of the embodiments of the present application, the first access network device is constructed for 3G The first virtual grid of the cell includes: the first access network device obtains the periodically reported MR, the MR is measured by the target terminal device through the same frequency period, and the MR includes the RSRP of the 3G cell Value; the first access network device segments the RSRP value to obtain each RSRP segment number, the RSRP interval value corresponding to each RSRP segment number, and the 3G corresponding to each RSRP segment number The cell ID of the cell; the first access network device counts the number of attempts made by any terminal device to establish a connection with the first access network device from the 5G network to the 3G network within a preset time interval, and Number of failures; the first access network device constructs a first virtual grid list according to each RSRP segment number, each cell ID, the number of attempts, and the number of failures.

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

With reference to the second implementation manner of the first aspect of the embodiments of the present application, in the third implementation manner of the first aspect of the embodiments of the present application, the method further includes: the first access network device updates according to a preset period The first virtual grid list makes the data of the first virtual grid list more accurate.

Combining the second implementation manner of the first aspect of the embodiments of the present application and the third implementation manner of the first aspect of the embodiments of the present application, in the fourth implementation manner of the first aspect of the embodiments of the present application, the voice service is based on all The returning of the first virtual grid from the 5G network to the 3G network may include: the first access network device determines the target RSRP segment number according to the acquired target MR of the current period and the second corresponding to the target cell ID. The first target grid in a virtual grid list, the first target grid includes the target RSRP segment number, the target cell ID, the number of attempts and the number of failures; the first connection The network access device determines the type of the first target grid; if the first access network device determines that the type of the first target grid is the first type, the voice service is transferred from the voice service in a blind manner. The 5G network returns to the 3G network.

In the above-mentioned embodiment of the present application, it is specifically explained how the voice service of the target terminal device is returned from the 5G network to the 3G network in a blind manner, and the specific applicability is described.

With reference to the fourth implementation manner of the first aspect of the embodiments of the present application, in the fifth implementation manner of the first aspect of the embodiments of the present application, if the first access network device determines that the type of the first target grid is In the second type, the first access network device determines whether the historical voice service is returned from the 5G network to the 3G network in a blind manner; if so, the voice service is transferred from the 5G network in a blind manner. The network returns to the 3G network; if not, the voice service returns from the 5G network to the 3G network in a measured manner.

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

In the above-mentioned embodiments of the present application, when the first virtual grid is of different types, how the voice service initiated by the target terminal device can be switched according to the different types of the first virtual grid, which is flexible and improved The effectiveness of each handover process.

The second aspect of the embodiments of the present application also provides a method for interoperating between different access network devices, including:

When the voice service ends, the second access network device obtains a handover request message sent by the third access network device. The handover request message is used to instruct the target terminal device to switch from the 3G network to the 4G network. The handover request The message carries private information, the private information is used to indicate that the target terminal device is a terminal device supporting a 5G network, and the voice service is a voice returned from the 5G network to the 3G network based on the first virtual grid For services, the first virtual grid is constructed by the first access network device in response to a trigger instruction for the 3G cell; the second access network device identifies the target terminal device as supporting the 5G network according to the private information The second access network device constructs a second virtual grid oriented to the 5G cell, so that the target terminal device is switched from the 4G network to the 5G network based on the second virtual grid.

In the embodiment of this application, the first access network device reduces the access delay by constructing the first virtual grid for the 3G cell, that is, the voice service of the target terminal device is directly derived from the constructed first virtual grid. The 5G network is switched to the 3G network (for example, through the SRVCC method), and the second access network device again reduces the return delay by constructing a second virtual grid oriented to the 5G cell, thereby reducing the number of different access network devices. The total time delay for interoperability between the two improves the user experience.

With reference to the second aspect of the embodiments of the present application, in the first implementation manner of the second aspect of the embodiments of the present application, the trigger instruction may include: the signal quality of the 5G network in the area where the target terminal device is located is weaker than The signal quality of the 3G network and the LTE network does not deploy VOLTE.

With reference to the second aspect of the embodiments of the present application and the first implementation manner of the second aspect of the embodiments of the present application, in the second implementation manner of the second aspect of the embodiments of the present application, the second access network device is constructed for 5G The second virtual grid of the cell may include: the second access network device obtains the periodically reported MR, the MR is obtained by the target terminal device through the same frequency period measurement, and the MR includes the MR of the 5G cell. RSRP value; the second access network device segments the RSRP value to obtain the RSRP segment number, the RSRP interval value corresponding to each RSRP segment number, and the RSRP segment number corresponding to each RSRP segment number. The cell ID of the 5G cell; the second access network device counts any terminal device that establishes a connection with the second access network device within a preset time interval from the 4G network to the 5G network The number of attempts and the number of failures; the second access network device constructs a second virtual grid list according to the RSRP segment number, each cell ID, the number of attempts, and the number of failures.

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

With reference to the second implementation manner of the second aspect of the embodiments of the present application, in the third implementation manner of the second aspect of the embodiments of the present application, the method further includes: the second access network device updates according to a preset period The second virtual grid list. Thus, the data of the first virtual grid list is more accurate.

In combination with the second implementation manner of the second aspect of the embodiments of the present application and the third implementation manner of the second aspect of the embodiments of the present application, in the fourth implementation manner of the second aspect of the embodiments of the present application, the target terminal device Switching from a 4G network to a 5G network based on the second virtual grid may include: the second access network device determines the target RSRP segment number and the first target cell ID corresponding to the target MR of the current period. 2. The second target grid in the virtual grid list, where the second target grid includes the target RSRP segment number, the target cell ID, the number of attempts and the number of failures; the second connection The network access device determines the type of the second target grid; if the second access network device determines that the type of the second target grid is the first type, then the target terminal device is sent to the destination in a blind manner. The 4G network is switched to the 5G network.

In the foregoing embodiment of the present application, the specific applicability of the target terminal device being switched from the 4G network to the 5G network in a blind manner is specifically described.

With reference to the fourth implementation manner of the second aspect of the embodiments of the present application, in the fifth implementation manner of the second aspect of the embodiments of the present application, if the second access network device determines that the type of the second target grid is In the second type, the second access network device determines whether the history switching mode of any terminal device that establishes a connection with the second access network device is to switch from the 4G network to the 5G in a blind manner. Network; if yes, the target terminal device switches from the 4G network to the 5G network in a blind manner; if not, the target terminal device switches from the 4G network to the 5G network in a measured manner .

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

In the above-mentioned embodiments of the present application, when the second virtual grids are of different types, how the target terminal device switches according to the different types of the second virtual grids is described separately, which is flexible and improves the effectiveness of each switching process. Sex.

The third aspect of the embodiments of the present application provides a method for interoperating between different access network devices, including: the first access network device establishes a first connection with the target terminal device; if the NR network does not deploy VONR and LTE If VOLTE is not deployed on the network, when the target terminal device initiates a voice service, the first access network device constructs a third virtual grid for the 4G cell and disconnects the first connection so that the target The terminal device switches from the 5G network to the 4G network based on the third virtual grid, and switches from the 4G network to the 3G network based on the fourth virtual grid, so that the target terminal device initiates the voice on the 3G network Service, the fourth virtual grid is constructed by a second access network device facing the 3G cell; when the voice service ends, the first access network device re-establishes a second connection with the target terminal device, The second connection is triggered by a fifth virtual grid oriented to the 5G cell constructed by the second access network device, and the step of constructing the second access network device oriented to the 5G cell is triggered by the third access network device Triggered by a handover request message sent to the second access network device, 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 The private information is used to indicate that the target terminal device is a terminal device supporting the 5G network.

With reference to the third aspect of the embodiments of the present application, in the first implementation manner of the third aspect of the embodiments of the present application, the construction of the third virtual grid for the 4G cell by the first access network device includes: the first access The network access device obtains the periodically reported MR, the MR is obtained by the target terminal device through the same frequency period measurement, the MR includes the RSRP value of the 4G cell; the first access network device responds to the RSRP Values are segmented to obtain each RSRP segment number, the RSRP interval value corresponding to each RSRP segment number, and the cell ID of the 4G cell corresponding to each RSRP segment number; the statistics of the first access network equipment The number of attempts and the number of failures for any terminal device that has established a connection with the first access network device to switch from a 5G network to a 4G network within a preset time interval; the first access network device segmented according to the RSRP Number, each cell ID, the number of attempts, and the number of failures to construct a third virtual grid list.

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

With reference to the first implementation manner of the third aspect of the embodiments of the present application, in the second implementation manner of the third aspect of the embodiments of the present application, the method further includes: the first access network device updates according to a preset period The third virtual grid list makes the data of the third virtual grid list more accurate.

In combination with the first implementation of the third aspect of the embodiments of the present application and the second implementation of the third aspect of the embodiments of the present application, in the third implementation of the third aspect of the embodiments of the present application, the target terminal device is based on The switching of the third virtual grid from the 5G network to the 4G network includes: the first access network device determines the target RSRP segment number according to the acquired target MR of the current period and the third virtual grid corresponding to the target cell ID. The third target grid in the grid list, where the third target grid includes the target RSRP segment number, the target cell ID, the number of attempts, and the number of failures; the first access network The device determines the type of the third target grid; if the first access network device determines that the type of the third target grid is the first type, the target terminal device is blindly transferred from the 5G The network is switched to the 4G network.

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

With reference to the third implementation manner of the third aspect of the embodiments of the present application, in the fourth implementation manner of the third aspect of the embodiments of the present application, the method further includes: if the first access network device determines that the third If the type of the target grid is the second type, the first access network device determines whether the history switching mode of any terminal device that establishes a connection with the first access network device is that the 5G The network is switched to the 4G network; if yes, the target terminal device is switched from the 5G network to the 4G network in a blind manner; if not, the target terminal device is switched from the 5G network in a measured manner Switch to the 4G network.

In combination with the third implementation manner of the third aspect of the application examples and the fourth implementation manner of the third aspect of the application examples, in the fifth implementation manner of the third aspect of the examples of the application, the method further includes: If the first access network device determines that the third target grid is of the third type, the target terminal device performs handover according to a preset manner.

In the above-mentioned embodiments of the present application, when the third virtual grid is of different types, how the target terminal device can switch according to the different types of the third virtual grid is described separately, which is flexible and improves the effectiveness of each switching process. Sex.

The fourth aspect of the embodiments of the present application also provides a method for interoperating between different access network devices, including: if VONR is not deployed on the NR network and VOLTE is not deployed on the LTE network, when the target terminal device initiates a voice service, The second access network device establishes a third connection with the target terminal device, and the third connection is triggered by a third virtual grid oriented to the 4G cell constructed by the first access network device; the second access network The device constructs a fourth virtual grid facing the 3G cell, so that the target terminal device switches from a 4G network to a 3G network based on the fourth virtual grid, and causes the target terminal device to initiate the 3G network on the 3G network. Voice service; when the voice service ends, the second access network device obtains a handover request message sent by a third access network device, and the handover request message is used to instruct the target terminal device to use the 3G network Switch to the 4G network, the handover request message carries private information, and the private information is used to indicate that the target terminal device is a terminal device supporting the 5G network; the second access network device is based on the The private information identifies the target terminal device as a terminal device supporting the 5G network; the second access network device constructs a fifth virtual grid oriented to the 5G cell, so that the target terminal device is based on the fifth virtual grid The grid is switched from the 4G network to the 5G network.

In the foregoing embodiments of the present application, the first access network device first reduces the access delay by constructing a third virtual grid oriented to the 4G cell, that is, the target terminal device is switched from the 5G network to the 5G network based on the third virtual grid. 4G network (for example, through the EPS FB method), after that, the second access network device constructs a fourth virtual grid facing the 3G cell to further reduce the access delay, that is, the target terminal device is based on the fourth virtual grid. The grid is then switched from the 4G network to the 3G network (for example, through the CSFB method), and the second access network device again reduces the return delay by constructing a fifth virtual grid facing the 5G cell, thereby reducing various access The total delay of interoperability between network devices improves the user experience.

With reference to the fourth aspect of the embodiments of the present application, in the first implementation manner of the fourth aspect of the embodiments of the present application, the construction of the fourth virtual grid for the 3G cell by the second access network device includes: the second access The network access device obtains the periodically reported MR, the MR is obtained by the target terminal device through the same frequency period measurement, the MR includes the RSRP value of the 3G cell; the second access network device responds to the RSRP Values are segmented to obtain each RSRP segment number, the RSRP interval value corresponding to each RSRP segment number, and the cell ID of the 3G cell corresponding to each RSRP segment number; the second access network The device counts the number of attempts and the number of failures for any terminal device that has established a connection with the second access network device to switch from the 4G network to the 3G network within a preset time interval; the second access network device is based on The RSRP segment number, each cell ID, the number of attempts, and the number of failures construct a fourth virtual grid list.

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

With reference to 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: updating the second access network device according to a preset period The fourth virtual grid list makes the data of the fourth virtual grid list more accurate.

In combination with the first implementation manner of the fourth aspect of the embodiments of the present application and the second implementation manner of the fourth aspect of the embodiments of the present application, in the third implementation manner of the fourth aspect of the embodiments of the present application, the target terminal device Switching from a 4G network to a 3G network based on the fourth virtual grid includes: the second access network device determines the target RSRP segment number and the fourth corresponding to the target cell ID according to the acquired target MR of the current period. The fourth target grid in the virtual grid list, where the fourth target grid includes the target RSRP segment number, the target cell ID, the number of attempts and the number of failures; the second access The network device determines the type of the fourth target grid; if the second access network device determines that the type of the fourth target grid is the first type, the target terminal device is blindly sent from the The 4G network is switched to the 3G network.

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

With reference to the third implementation manner of the fourth aspect of the embodiments of the present application, in the fourth implementation manner of the embodiments of the present application, the method further includes: if the second access network device determines the fourth target grid If the type is the second type, the second access network device determines whether the history switching mode of any terminal device that establishes a connection with the second access network device is to switch from the 4G network to the 4G network in a blind manner. The 3G network; if yes, the target terminal device switches from the 4G network to the 3G network in a blind manner; if not, the target terminal device switches from the 4G network to the 3G network in a measured manner The 3G network is described.

In combination with the third implementation manner of the fourth aspect of the embodiments of the present application and the fourth implementation manner of the fourth aspect of the embodiments of the present application, in the fifth implementation manner of the embodiments of the present application, the method further includes: The second access network device determines that the type of the fourth target grid is the third type, and the target device performs handover according to a preset manner.

In the above-mentioned embodiments of the present application, when the fourth virtual grid is of different types, how the target terminal device can switch according to the different types of the fourth virtual grid is described separately, which is flexible and improves the effectiveness of each switching process. Sex.

With reference to the fourth aspect of the embodiments of the present application, the first implementation manner of the fourth aspect to the fifth implementation manner of the fourth aspect, in the sixth implementation manner of the embodiments of the present application, the second access network device is constructed The fifth virtual grid oriented to the 5G cell includes: the second access network device obtains the periodically reported MR, the MR is measured by the target terminal device through the same frequency period, and the MR includes the 5G cell The RSRP value; the second access network device segments the RSRP value to obtain each RSRP segment number, the RSRP interval value corresponding to each RSRP segment number, and each RSRP segment number respectively The cell ID of the 5G cell; the second access network device counts any terminal device that has established a connection with the second access network device within a preset time interval to switch from the 4G network to the 5G network The number of attempts and the number of failures; the second access network device constructs a fifth virtual grid list according to the RSRP segment number, each cell ID, the number of attempts, and the number of failures.

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

With reference to the sixth implementation manner of the fourth aspect of the embodiments of the present application, in the seventh implementation manner of the embodiments of the present application, the method further includes: the second access network device updates the fifth The virtual grid list makes the data of the fifth virtual grid list more accurate.

In combination with the sixth implementation manner of the fourth aspect of the embodiments of the present application and the seventh implementation manner of the fourth aspect of the embodiments of the present application, in the eighth implementation manner of the embodiments of the present application, the target terminal device is based on the first The five virtual grid switching from the 4G network to the 5G network includes: the second access network device determines the target RSRP segment number and the fourth corresponding to the target cell ID according to the acquired target MR of the current period. The fifth target grid in the virtual grid list, where the fifth target grid includes the target RSRP segment number, the target cell ID, the number of attempts and the number of failures; the second access The network device determines the type of the fifth target grid; if the second access network device determines that the type of the fifth target grid is the first type, the target terminal device is blindly sent from the The 4G network is switched to the 5G network.

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

With reference to the eighth implementation manner of the fourth aspect of the embodiments of the present application, in the 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 fifth If the type of the target grid is the second type, the second access network device determines whether the history switching mode of any terminal device that establishes a connection with the second access network device is that the 4G The network is switched to the 5G network; if yes, the target terminal device is switched from the 4G network to the 5G network in a blind manner; if not, the target terminal device is switched from the 4G network in a measured manner Switch to the 5G network.

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 the tenth 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 third type, the target device performs handover according to a preset manner.

In the above-mentioned embodiments of the present application, when the fifth virtual grid is of different types, how the target terminal device can switch according to the different types of the fifth virtual grid, which is flexible and improves the effectiveness of each switching process. Sex.

The fifth aspect of the embodiments of the present application provides an access network device. When the access network device serves as the first access network device,

It has the function of realizing the above-mentioned first aspect or any one of the possible implementation methods of the first aspect, and this function can be realized by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-mentioned functions; when the access network device is used as a second access network device, it has the ability to implement the above-mentioned second aspect or any one of the possible implementation modes of the second aspect The function of the method can be realized by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-mentioned functions.

The sixth aspect of the embodiments of the present application also provides an access network device. When the access network device serves as the first access network device, it has a method for implementing the third aspect or any one of the possible implementation manners of the third aspect. The function can be realized by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-mentioned functions; when the access network device is used as a second access network device, it has the ability to implement any one of the foregoing fourth aspect or the fourth aspect. The function of the method can be realized by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-mentioned functions.

A seventh aspect of the embodiments of the present application provides a data processing device, which may include: a processor and a memory; the memory is used to store a program; the processor is used to execute the program, so as to implement the first aspect or the first aspect described above. Steps of any one of the possible implementation methods in the aspect.

An eighth aspect of the embodiments of the present application provides a data processing device, which may include: a processor and a memory; the memory is used to store a program; the processor is used to execute the program, so as to implement the second aspect or the second aspect described above. Steps of any one of the possible implementation methods in the aspect.

A ninth aspect of the embodiments of the present application provides a data processing device, which may include: a processor and a memory; the memory is used to store a program; the processor is used to execute the program to implement the third aspect or the third aspect described above. Steps of any one of the possible implementation methods in the aspect.

A tenth aspect of the embodiments of the present application provides a data processing device, which may include: a processor and a memory; the memory is used to store a program; the processor is used to execute the program to implement the fourth aspect or the fourth aspect described above. Steps of any one of the possible implementation methods in the aspect.

The eleventh aspect of the embodiments of the present application provides a communication system, which may include: a first access network device, a second access network device, and a third access network device; the first access network device is used to implement Such as the steps of the method in any one possible implementation manner of the first aspect or the first aspect; the second access network device is used to implement the method in any one possible implementation manner of the second aspect or the second aspect above Step; The third access network device is used to initiate a voice call to the target terminal device, and send a handover request message to the second access network device when the voice call ends.

The twelfth aspect of the embodiments of the present application provides a communication system, which may include: a first access network device, a second access network device, and a third access network device; the first access network device is used to implement Such as the steps of the method in any one of the foregoing third aspect or the third aspect; the second access network device is used to implement the method in any one of the foregoing fourth aspect or the fourth aspect Step; The third access network device is used to initiate a voice call to the target terminal device, and send a handover request message to the second access network device when the voice call ends.

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, or a third access network device, etc., to implement the above-mentioned first aspect of the present application The function involved in any implementation of any aspect of the fourth aspect, for example, for example, processing the data and/or information involved in the above method. In a possible design, the chip system further includes a memory for storing necessary program instructions and data for the first access network device, the second access network device, or the third access network device. The chip system can be composed of chips, and can also include chips and other discrete devices.

Among them, the processor mentioned in any of the above can be a general-purpose central processing unit (Central Processing Unit, CPU), microprocessor, application-specific integrated circuit (ASIC), or one or more An integrated circuit for controlling program execution of the methods in the first to fourth aspects described above.

The fourteenth aspect of the embodiments of the present application provides a storage medium. It should be noted that the technical solution of the present invention is essentially or the part that contributes to the existing technology, or all or part of the technical solution can be produced by software. The computer software product is stored in a storage medium for storing the computer software instructions used by the above-mentioned equipment, which includes the implementation of any one of the above-mentioned first aspect to the fourth aspect. The method is a program designed by a data processing device, such as a first access network device, a second access network device, or a third access network device.

The storage medium includes: U disk, mobile hard disk, read-only memory (English abbreviation ROM, English full name: Read-Only Memory), random access memory (English abbreviation: RAM, English full name: Random Access Memory), magnetic disk or CD-ROM Various media that can store program codes.

The fifteenth aspect of the embodiments of the present application provides a computer program product containing instructions, which when run on a computer, causes the computer to execute as described in any implementation manner of any one of the first to fourth aspects of the present application Methods.

It can be seen from the above technical solutions that the embodiments of the present application have the following advantages: First, the first access network device (the first access network device includes the access network device supporting the 5G network) establishes a first connection with the target terminal device. Connection; if NR deploys VONR and the target terminal device initiates a voice service at this time, then the first access network device responds to the voice service initiated by the target terminal device; and responds to the trigger instruction (for example, the trigger instruction can be the target terminal device The signal quality of the 5G network in the area is weaker than that of the 3G network and the LTE network has not deployed VOLTE), the first access network device constructs a first virtual grid facing the 3G cell, and disconnects the first connection, At this time, the voice service initiated by the target terminal device will be switched from the 5G network to the 3G network based on the first virtual grid; when the voice service ends on the 3G network side, the third access network device (the third access network device (Including the access network device supporting the 3G network) will send a handover request message to the second access network device (the second access network device includes the access network device supporting the 4G network), and the handover request message is used to indicate the target The terminal device will switch from the 3G network to the 4G network, and the switching request message carries private information, which is used to indicate that the target terminal device is a terminal device supporting the 5G network; after the second access network device obtains the switching request message , Through the private message it carries, it can be known that the target terminal device is a terminal device supporting 5G network, then the second access network device will construct a second virtual grid facing the 5G cell, based on the second virtual grid, the first An access network device will re-establish a second connection with the target terminal device (that is, after the voice service ends on the 3G side, the target terminal device switches from the 3G network to the 4G network, and then returns to the 5G network). In the embodiment of the present application, the first access network device reduces the access delay by constructing a first virtual grid oriented to the 3G cell, and the second access network device reduces the access delay by constructing a second virtual grid oriented to the 5G cell. The return delay improves the user experience.

Description of the drawings

Figure 1 is a schematic diagram of a system architecture involved in an embodiment of the application;

Figure 2 is a schematic diagram of interoperability between different access network devices;

Figure 3 is another schematic diagram of interoperability between different access network devices;

FIG. 4 is a schematic diagram of a method for interoperating between different access network devices in an embodiment of this application;

FIG. 5 is another schematic diagram of a method for interoperating between different access network devices in an embodiment of this application;

Fig. 6 is a schematic diagram of a data processing device in an embodiment of the application;

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

detailed description

The embodiments of the present application provide a method, device, and system for interoperating between different access network devices, which are used to reduce the access delay of a terminal device switching from a 5G network to a 3G network and reduce the terminal device’s transfer from a 4G network. The return delay of returning to the 5G network improves the user experience.

Before introducing this embodiment, first introduce the network elements that may be involved in the embodiment of this application. It should be understood that the conceptual interpretation of related network elements may be limited due to the specific circumstances of the embodiments of this application, but it does not mean that this application can only be limited to this specific situation, and specific circumstances may also exist in different embodiments. The difference is not limited here.

Terminal equipment, also known as User Equipment (UE), can be smart devices such as mobile phones, desktop computers, notebooks, and palmtop computers, or smart wearable devices such as smart watches and smart bracelets. The terminal device only needs to have the functions of accessing the 2G/3G/4G/5G network and initiating voice services, and the terminal device is not specifically limited here. In this embodiment of the application, the terminal device is used to initiate a voice service.

NG Radio Access Network (NG-RAN), the name of the base station in NR, in the embodiment of this application, is responsible for terminal equipment to initiate NR network voice service (voice over NR, VONR), and to initiate terminal equipment The voice service is switched to the 4G network or 3G network through a preset method. It should be noted that the NG-RAN provided in the embodiments of the present application can be applied to various communication networks, for example, it can be applied to 5G networks, and it can also be applied to future communication networks, such as 6G networks, 7G networks, etc., and NG-RAN The name of the network element of the RAN is not limited, and it can be replaced with the name of a network element with the same or similar functions in the future communication network, which is not limited in this application. For ease of description, in the embodiments of this application, the application of NG-RAN to a 5G network is taken as an example for description. It should also be noted that, in the embodiments of the present application, the devices capable of implementing the above-mentioned functions of the NG-RAN may also be collectively referred to as the first access network device.

Evolved Node B (Evolved Node B, eNodeB), abbreviated as eNB, is the name of the base station in LTE. Compared with the Node B in the existing 3G network, it integrates some of the functions of the Radio Network Controller (RNC). The level of the communication protocol is reduced. In the embodiment of the application, it is used to return to the 3G/2G network by performing a preset handover method (such as the CSFB method) on the terminal device on the 4G network side, and to the 4G network The terminal device on the side (if the terminal device is a terminal device that supports 4G and 5G networks) performs handover, redirection, or reselection back to the 5G network side, and is also used to parse the third access network device (such as RNC) sent The private information carried in the handover request message. In the embodiments of the present application, the devices capable of implementing the above-mentioned functions of the eNodeB may also be collectively referred to as the second access network device.

RNC, the main network element in the third-generation (3G) wireless network, is an integral part of the access network, responsible for mobility management, call processing, link management and handover mechanism; Base Station Controller (BSC) It is the main network element in the second-generation (2G) wireless network. It is the connection point between the base transceiver station and the mobile switching center, and it also provides an interface for the exchange of information between the base transceiver station and the mobile switching center. In the embodiment of this application, the RNC/BSC is responsible for initiating voice calls to the terminal equipment on the 3G/2G network side, and to the terminal equipment on the 3G/2G network side (if the terminal equipment is a terminal supporting 4G and 5G networks) Device) performs handover, redirection, or reselection back to the 4G network side, and carries private information to notify the second access network device on the 4G network side that the terminal device is a terminal device that supports the 5G network. In this embodiment of the application , The equipment with the above-mentioned functions of realizing the RNC/BSC can also be collectively referred to as the third access network equipment.

In addition, the system architecture involved in the embodiments of this application will be further introduced. As shown in FIG. 1, the SA networking scenario applied in the embodiments of this application. In this SA networking scenario, if the terminal device (the terminal device In order to support 5G network terminal equipment) there is a voice service, it can be carried by the three methods shown in Figure 1, method 1, method 2, and method 3. The details of these three bearer methods are as described above, and they are not provided here. Go into details.

Among them, in mode 1, if the NR has deployed VONR, the voice service initiated by the terminal device can be directly established on the NR, and the specific steps can be shown in Figure 2.

201. The terminal device is directly switched from the 5G network to the 3G network through the SRVCC method.

The terminal device is directly switched from the 5G network to the 3G network through the SRVCC method (that is, the terminal device switches from establishing a connection with the first access network device to establishing a connection with the third access network device). Before performing the switching steps through the SRVCC method, There can also be two specific implementation methods: 1) Measurement method. When the 5G network on the NR side is weakly covered, the terminal device first measures the UMTS-oriented different system on the NR side. If the cell signal of the 3G network meets certain conditions, Then switch to the 3G network through the SRVCC mode, which has a measured time delay. 2) Blind method. When the 5G network on the NR side has weak coverage, the terminal equipment is free from measurement on the NR side and directly switches to the 3G network through SRVCC blindly (that is, without measurement). The disadvantages of this blind method are: If the coverage of the 3G network and the 5G network are inconsistent, there is a risk that calls will be dropped due to running out of space.

202. The terminal device returns to the 4G network through handover/redirection.

When the terminal device completes the voice service on the 3G side, it will return to the 4G network side through the switch/redirection from the 3G network to the 4G network (that is, the terminal device switches from establishing a connection with the third access network device to connecting with the second access network device). The connection established by the network equipment), the return delay at this stage is about 500 milliseconds.

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

After the terminal device is returned from the 3G network, since the second access network device on the 4G network side cannot perceive that the terminal device is a terminal device that supports 5G networks, the second access network device will not execute the execution on the terminal device. Switching or redirecting from 4G network to 5G network can only allow the terminal device to return to the 5G network through the user's manual reselection when it is idle. The delay manually set by the user is about 7-8 seconds. If there is still PS service on the device, the PS service must be ended before the user can go to the idle state so that the user can perform reselection. At this time, the terminal device may hang on the 4G network side for a long time, so that the terminal device will change from 4G to the 4G network. The return delay of the network returning to the 5G network is longer.

In addition, in way 3, if VONR is not deployed in NR and VOLTE is not deployed in the LTE network, the terminal device can initiate a voice service on the 3G network side, and the specific steps can be shown in FIG. 3.

301. Terminal equipment is switched from a 5G network to a 4G network through EPS FB.

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 a connection with the first access network device to establishing a connection with the second access network device). Before the steps, there can also be two specific execution methods: 1) Measurement method, the terminal device first measures the LTE-oriented different system on the NR side, and if there is a 4G network cell signal that meets certain conditions, it will be switched by EPS FB method. To the 4G network, this method also has a measured delay. 2) Blind method, the terminal equipment does not need to measure on the NR side, and directly switches to the 4G network through the EPS FB blindly (that is, no measurement). The disadvantage of this blind method is that if the coverage of the 4G network and the 5G network are inconsistent , There is a risk of losing the call due to stepping on the air.

302. The terminal device is switched from the 4G network to the 3G network by means of CSFB.

The terminal device switches from the 5G network to the 4G network through the EPS FB method, and will further switch from the 4G network to the 3G network through the CSFB method (that is, the terminal device switches from establishing a connection with the second access network device to establishing a connection with the third access network device Connection), before performing the handover steps through CSFB, there can also be two specific execution methods: 1) Measurement method, the terminal equipment performs UMTS-oriented measurement of the different system on the LTE side, if the cell signal of the 3G network meets certain requirements Condition, then switch to 3G network through CSFB way, this way also has measured time delay. 2) Blind method, the terminal equipment does not need to be measured on the LTE side, and directly switches to the 3G network through the blind method (that is, without measurement) CSFB. The disadvantage of this blind method is that if the coverage of the 4G network and the 3G network are inconsistent, Then there is a risk of losing the call by stepping out.

303. The terminal device returns to the 4G network through handover/redirection.

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

Steps 303-304 are similar to the above-mentioned steps 202-203, and will not be repeated here.

In summary, whether the terminal device switches from the 5G network to the 3G network through Mode 1 or Mode 3, both switching modes have a large access delay; in addition, in Mode 1 and Mode 3, the terminal equipment After the voice service is switched from the 3G network to the 4G network side, the access network device on the 4G network side cannot perceive that the terminal device is a terminal device that supports the 5G network, so the access network device on the 4G network side will not respond to it. The terminal device performs the switch or redirection from the 4G network to the 5G network. The terminal device can only be returned to the 5G network by the user through reselection when it is idle. At this time, the return delay of the terminal device back to the 5G network is about 8 seconds If the terminal device also has a PS service, it needs to wait for the end of the PS service to return to the idle state for the user to perform the reselection operation. At this time, the terminal device will hang on the 4G network side for a long time, resulting in The return delay is longer. The long time-consuming access delay and return delay result in poor user experience.

In order to solve the above-mentioned problems caused by the above-mentioned methods, an embodiment of the present application provides a method for interoperating between different access network devices. The method is applied to the system architecture described in FIG. Introduction. It should be noted that in the following embodiments of the present application, a terminal device supporting a 5G network is referred to as a target terminal device.

1. The scenario where the target terminal device is directly switched from the 5G network to the 3G network.

Referring to FIG. 4, an embodiment of the present application first provides a method for interoperating between different access network devices, which is specifically described as follows.

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

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

402. The target terminal device initiates a voice service.

If the NR network is deployed with 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 oriented to the 3G cell.

When the first access network device carries the 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 the first virtual grid for the 3G cell . The trigger instruction may have various forms, which are not specifically limited here. For example, the trigger instruction may be that the signal quality of the 5G network in the area where the target terminal device is located is weaker than the signal quality of the 3G network and the LTE network does not deploy VOLTE. In other words, if the NR has weak coverage and the 4G network cannot carry the voice service of the target terminal device, the first access network device will construct the first virtual grid for the 3G cell.

It should be noted that, in some implementation manners of the present application, the manner in which the first access network device constructs the first virtual grid for the 3G cell can be performed through the following steps:

Step 1. The first access network device obtains a measurement report (Measurement Result, MR) periodically reported by the target terminal device, the MR is obtained by the target terminal device through the same frequency period measurement, and the MR includes the 3G cell The reference signal receiving power (Reference Signal Receiving Power, RSRP) value.

Step 2. The first access network device processes the periodically reported MR, that is, segments the acquired RSRP value to obtain each RSRP segment number and the RSRP interval value corresponding to each RSRP segment number, The cell ID of the 3G cell corresponding to each RSRP segment number.

For ease of understanding, the following takes Table 1 as an example: First, the first access network device divides the RSRP value measured in the MR according to the preset segmentation step (in Table 1, the segmentation step is Take 3dB as an example. In fact, the segment step size can be any value set by the user, such as 4dB, 10DB, etc., which are not limited here), because the agreement stipulates that the RSRP value range is [-156, -31 ], then according to the segmentation form with a segmentation step of 3dB, you can get the different RSRP interval values in Table 1, the RSRP segment number corresponding to each RSRP interval value, and the 3G cell corresponding to each RSRP interval value. Cell ID. For example, the third column in Table 1 can be arranged in ascending order of cell ID values. Table 1 shows that the cell IDs corresponding to the first four RSRP intervals are 001, 001, 002, and 004, respectively.

Table 1: Correspondence between RSRP interval value, RSRP segment number, and cell ID of 3G cell

RSRP区间取值RSRP interval value	RSRP分段号RSRP segment number	3G小区的小区IDCell ID of the 3G cell
[-156,-153)[-156,-153)	00	001001
[-153,-150)[-153,-150)	11	001001
[-150,-147)[-150,-147)	22	002002
[-147,-144)[-147,-144)	33	004004
……...	……...	……...

Since 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 the same-frequency MR field information table shown in Table 2. 2 includes the MR reporting time, the cell ID of each 3G cell, and the RSRP segment number corresponding to the cell ID. It should be noted that the first access network device will automatically classify the RSRP segment number to which the cell ID of each 3G cell belongs according to the value of the segmented RSRP interval as shown in Table 2. This is a table automatically generated according to the MR reported by the target terminal device (because the RSRP segment number has been assigned by the first access network device, at this time Table 2 only needs to be automatically generated according to the algorithm).

Table 2: Same-frequency MR field information table

MR上报时间MR reporting time	2019.09.14 8:002019.09.14 8:00
3G小区1的IDID of 3G cell 1	001001
3G小区1的RSRP分段号RSRP segment number of 3G cell 1	0、10, 1
3G小区2的IDID of 3G cell 2	002002
3G小区2的RSRP分段号RSRP segment number of 3G cell 2	22
3G小区3的IDID of 3G cell 3	003003
3G小区3的RSRP分段号RSRP segment number of 3G cell 3	无no
3G小区4的IDID of 3G cell 4	004004
3G小区4的RSRP分段号RSRP segment number of 3G cell 4	33

...

Step 3. After that, the first access network device counts the preset time interval (for example, 24 hours, 48 hours, 72 hours, the preset time interval can be set by yourself, and it is not limited here). The number of attempts and failures for the terminal device connected to the network to establish a connection from the 5G network to the 3G network. In some implementations of this application, it is necessary to count the number of attempts and the number of failures of a terminal device to switch from a 5G network to a 3G network in two scenarios:

Scenario 1, perform handover (including blind mode or handover performed after measurement).

Counting the number of attempts: When the first access network device sends a handover execution message to the target terminal device, the number of attempts is counted in the 5G cell to which the target terminal device currently belongs.

Counting the number of failures: When the target terminal device performs the switch from the 5G network to the 3G network, if the first access network device obtains the switching failure message returned by the target terminal device, the number of failures is recorded once.

It should be noted that in scenario 1, the same-frequency MR used when the first access network device records the number of attempts and the number of failures is the preset time period before the corresponding signaling (eg: 5 seconds, 8 seconds, 10 seconds, etc.) , The preset time period can be set by yourself, this time it is not limited to the same frequency MR within).

Scenario 2, measurement timeout scenario.

When the target terminal device measures the UMTS neighboring cell by pressing the mold, if the first access network device is within the preset time period (for example, within 20 seconds, the preset time period can be set by itself, and it is not limited here). When the reported MR is reached, the measurement of the target terminal device is stopped, and the first access network device records the number of attempts and the number of failures at this time.

It should be noted that in scenario 2, the same frequency MR used by the first access network device to record the number of attempts and the number of failures is the preset time period before the timeout of the stamper (for example: 5 seconds, 8 seconds, 10 seconds) Etc., the preset time period can be set by oneself, this time it is not limited to the same frequency MR within).

Step 4. Finally, the first access network device constructs a first virtual grid list according to each RSRP segment number, each cell ID, the number of attempts and the number of failures. In the preset time interval, the number of attempts and failures for any terminal device to switch from the 5G network to the 3G network are counted in the grid within the preset time interval of the current cycle. If the preset time interval is 1 day, the statistics In the grid of the day. The specific process can be: 5G network to 3G network interoperability original information (that is, the number of attempts and the number of failures), if there is a preset time period (such as: 5 seconds, 8 seconds, 10 seconds, etc.), the preset time period can be free Set the same frequency MR field in this time without limitation), then fill in the first virtual grid list to be constructed. After that, you can find the raster record according to the same-frequency MR field information in Table 2. If the corresponding raster record is found, the number of attempts in the original information is added to the number of attempts from the 5G network to the 3G network that day in the raster record , The number of failures in the original information is added to the number of failures from the 5G network to the 3G network that day in the grid record. If the grid record cannot be found based on the same frequency MR field information, a new grid record is added to the first virtual grid list. For ease of understanding, the following takes Table 3 as an example to illustrate the first virtual grid list (taking the preset time interval of 1 day as an example). It should be noted that Table 3 only indicates that any terminal device is in the preset Grid information such as the number of failures and the number of attempts to access a 3G cell (for example, 3G cell 1) within the time interval, in fact, there are 3G cell 2, 3G cell 3,..., 3G cell n, and Table 3 is just an indication. A 3G cell (ie, 3G cell 1).

Table 3: List of the first virtual grid

3G小区1的IDID of 3G cell 1	001001
3G小区1对应的RSRP分段号RSRP segment number corresponding to 3G cell 1	0、10, 1

当天5G网络到3G网络失败次数Number of failures from 5G network to 3G network that day	1313
当天5G网络到3G网络尝试次数Number of attempts from 5G network to 3G network that day	7878
历史5G网络到3G网络失败次数Historical 5G network to 3G network failure times	21twenty one
历史5G网络到3G网络尝试次数Historical 5G network to 3G network attempts	421421
……...	……...

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

For ease of understanding, take the period of one day (ie 24 hours) as an example to illustrate schematically: you can choose a fixed time point every day (for example, every day at 5:00, 8:00, etc., which is not limited here) to start refreshing The first virtual grid list, if the "historical 5G network to 3G network attempts" is 0, then the "current 5G network to 3G network attempts" and "the day 5G network to 3G network failures" are directly updated to the historical record At the same time, "Number of attempts from 5G network to 3G network on the day" and "Number of failures from 5G network to 3G network on the day" are set to 0. If "the number of historical 5G network to 3G network attempts" is not 0, use the following filtering formula to filter to obtain "the number of historical 5G network to 3G network attempts" and "the number of historical 5G network to 3G network failures", and at the same time "5G network arrives on the same day" Set the number of 3G network attempts" and "the number of failures from 5G network to 3G network on the day" to 0. The filtering formula is as follows:

Fn=(1-a)*F(n-1)+a*Mn

Among them, a is the virtual grid filter coefficient (the value of a can be set by yourself, such as 0.3, 0.8, etc., which are not limited here. For example, when the default value of a is 0.6, then 5 days The impact of previous historical information on the current grid can basically be ignored); Fn is the grid information of the current cycle after filtering, F(n-1) is the grid information of the previous cycle, and Mn is the current unfiltered cycle Grid information. For example, when the period is 1 day (ie 24 hours), if n=6, then F6 is the grid information on the 6th day after filtering, F5 is the grid information on the 5th day, and M6 is unfiltered Grid information of the 6th day.

It should also be noted that, in some embodiments of the present application, if the "historical 5G network to 3G network attempts" in the first virtual grid list after filtering is less than 0.5, the corresponding grid information needs to be deleted. The deletion of the grid information can be performed after each grid information is updated, or after all the grid information is updated, which is not limited here. However, the deletion of the grid information is executed after each grid information is updated to delete invalid grid information as soon as possible to prevent the number of grid information from exceeding the list specification.

404. The voice service is switched from the 5G network to the 3G network based on the first virtual grid.

After the first access network device constructs the first virtual grid for the 3G cell, the voice service on the target terminal device will be switched from the 5G network to the 3G network based on the first virtual grid. The specific implementation steps may be:

First, the first access network device determines the target RSRP segment number and the first target in the first virtual grid list corresponding to the target cell ID according to the acquired target MR of the current period (that is, the same-frequency MR acquired this time). A grid, 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 searches the first virtual grid list for the cell ID and RSRP segment number corresponding to the cell ID and RSRP segment number of the 3G cell in the same frequency MR obtained this time. 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 judgment here, which are explained separately below:

First, the first access network device determines the type of the first target grid according to the above grid information. It should be noted that the type of the first virtual grid can be classified according to the principle of "success rate = (number of attempts-number of failures) / number of attempts", where the success rate can be the historical success rate or the previous cycle success. When the success rate is the historical success rate, the number of attempts is "the number of attempts from the historical 5G network to 3G network", and the number of failures is "the number of failures from the historical 5G network to the 3G network"; when the success rate is The current cycle success rate. Taking the current cycle as one day as an example, the current cycle success rate is the same day’s success rate. At this time, the number of attempts is "the number of attempts from the 5G network to the 3G network of the day", and the number of failures is "the number of attempts from the 5G network to the day The number of 3G network failures". In the embodiment of the present application, the first virtual grid can be divided into 3 types according to the above classification principle, where the first type includes: historical success rate> first preset percentage (for example, 99%); second type Including: second preset percentage (eg, 5%) <historical success rate <first preset percentage (eg, 99%); the third type includes: historical success rate <second preset percentage (eg, 5%) . Among them, the first preset percentage and the second preset percentage can be set by themselves, and will not be repeated here.

Based on the foregoing, there are three results for the first access network device to determine the type of the first target grid based on the grid information:

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 from the 5G network to the 3G network in a blind manner (for example, through SRVCC mode returns).

Result 2. 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 determines whether historical voice services are transferred from the 5G network in a blind manner. Return to the 3G network; if it is, the voice service is returned from the 5G network to the 3G network in a blind manner; if not, the voice service is returned to the 5G network from the 5G network in a measured manner. The 3G network is described.

Result 3. If the first access network device determines that the type of the first target grid is the third type, the voice service performs handover according to a preset manner. For example, the first access network device may randomly select a preset percentage (eg, 5%) of terminal devices to perform the handover from the 5G network back to the 3G network based on the measurement method, and the remaining 95% do not perform handover. If the target terminal device is exactly at the above 5%, then switching of the measurement mode is performed, and if the target terminal device is at the above 95%, then the handover is not performed. For another example, if the first access network device determines that the first virtual grid type is the third type, it simply does not perform handover. There is no restriction on the preset method here.

405. The third access network device bears the voice service.

After the voice service is returned from the 5G network to the 3G network based on the first virtual grid, the voice service will be carried by the third access network device.

406. After the voice service ends, the third access network device sends a handover request message to the second access network device, so that the target terminal device returns to the 4G network through handover/redirection.

When the voice service ends, the third access network device will send a handover request message to the second access network device, where the handover request message is used to instruct the target terminal device to switch from the 3G network to the 4G network, Based on this, the target terminal device will return to the 4G network through handover/redirection. In the embodiment of the present application, the handover request message carries private information, and the private information is used to indicate that the target terminal device is a terminal device supporting a 5G network.

407. The second access network device parses the handover request message.

After the second access network device obtains the handover request message sent by the third access network device, it will parse 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 to the 5G cell.

After the second access network device recognizes that the target terminal device is a terminal device supporting a 5G network, it will construct a second virtual grid for the 5G cell.

It should be noted that, in some embodiments of the present application, the second access network device constructing a second virtual grid oriented to a 5G cell can be performed through the following steps:

Step 1. The second access network device obtains the MR periodically reported by the target terminal device, the MR is obtained by the target terminal device through the same frequency period measurement, and the MR includes the RSRP value of the 5G cell.

Step 2. The second access network device processes the periodically reported MR, that is, segments the acquired RSRP value to obtain each RSRP segment number and the RSRP interval value corresponding to each RSRP segment number, The cell ID of the 5G cell corresponding to each RSRP segment number.

For ease of understanding, the following takes Table 4 as an example: First, the second access network device segments the RSRP value measured in the MR according to the preset segmentation step (in Table 4, the segmentation step is still used). The length is 3dB as an example. In fact, the segment step length can be any value set by the user, such as 4dB, 10dB, etc., which are not limited here), because the agreement stipulates that the RSRP value range is [-156,- 31], then according to the segmentation form with a segmentation step of 3dB, you can get the different RSRP interval values in Table 4, the RSRP segment number corresponding to each RSRP interval value, and the 5G cell corresponding to each RSRP interval value The cell ID. For example, the third column in Table 4 can be arranged in ascending order of cell ID values. Table 4 shows that the cell IDs corresponding to the first six RSRP intervals are 101, 102, 102, 102, 103, respectively. , 104.

Table 4: Correspondence between RSRP interval value, RSRP segment number, and cell ID of 5G cell

RSRP区间取值RSRP interval value	RSRP分段号RSRP segment number	5G小区的小区IDThe cell ID of the 5G cell
[-156,-153)[-156,-153)	00	101101
[-153,-150)[-153,-150)	11	102102
[-150,-147)[-150,-147)	22	102102
[-147,-144)[-147,-144)	33	102102
[-144,-141)[-144,-141)	44	103103
[-141,-138)[-141,-138)	55	104104
……...	……...	……...

Since 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 the same-frequency MR field information table shown in Table 5. 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 will automatically classify the RSRP segment number to which the cell ID of each 5G cell belongs according to the value of the segmented RSRP interval, as shown in Table 5 below. This is a table that is automatically generated based on the MR reported by the target terminal device (because the RSRP segment number has been assigned by the second access network device, at this time Table 5 only needs to be automatically generated according to the algorithm).

Table 5: Same frequency MR field information table

MR上报时间MR reporting time	2019.09.14 10:002019.09.14 10:00
5G小区1的IDID of 5G cell 1	101101
5G小区1的RSRP分段号RSRP segment number of 5G cell 1	00

5G小区2的IDID of 5G cell 2	102102
5G小区2的RSRP分段号RSRP segment number of 5G cell 2	1、2、31, 2, 3
5G小区3的IDID of 5G cell 3	103103
5G小区3的RSRP分段号RSRP segment number of 5G cell 3	44
5G小区4的IDID of 5G cell 4	104104
5G小区4的RSRP分段号RSRP segment number of 5G cell 4	55
……...	……...

Step 3. After that, the second access network device counts the preset time interval (for example, 24 hours, 48 hours, 72 hours, the preset time interval can be set by yourself, and there is no limitation here). The number of attempts and failures for the terminal device connected to the networked device to switch from the 4G network to the 5G network. In some implementations of this application, it is necessary to count the number of attempts and the number of failures of a terminal device to switch from a 4G network to a 5G network in two scenarios:

Counting the number of attempts: When the second access network device sends a handover execution message to the target terminal device, the number of attempts is counted in the 4G cell to which the target terminal device currently belongs.

Counting the number of failures: When the target terminal device performs a 4G network to a 5G network handover process, if the second access network device obtains the handover failure message returned by the target terminal device, the number of failures is recorded once.

It should be noted that in scenario 1, the same-frequency MR used by the second access network device to record the number of attempts and the number of failures is the preset time period before the corresponding signaling (eg: 5 seconds, 8 seconds, 10 seconds, etc.) , The preset time period can be set by yourself, this time it is not limited to the same frequency MR within).

Scenario 2, measurement timeout scenario.

When the target terminal device is used to measure the NR neighboring area, if the second access network device is within the preset time period (for example, within 20 seconds, the preset time period can be set by itself, and it is not limited here). When the reported MR is reached, the measurement to the target terminal device is stopped. 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 same frequency MR used by the second access network device to record the number of attempts and the number of failures is the preset time period before the timeout of the stamper (for example: 5 seconds, 8 seconds, 10 seconds) Etc., the preset time period can be set by oneself, this time it is not limited to the same frequency MR within).

Step 4. Finally, the second access network device constructs a second virtual grid list according to each RSRP segment number, each cell ID, the number of attempts and the number of failures. In the preset time interval, the number of attempts and failures for any terminal device to switch from a 4G network to a 5G network are counted in the grid within the preset time interval of the current cycle. If the preset time interval is 1 day, the statistics are calculated In the grid of the day. The specific process can be: 4G network to 5G network interoperability original information (that is, the number of attempts and the number of failures), if there is a preset time period (such as: 5 seconds, 8 seconds, 10 seconds, etc.), the preset time period can be free Set the same frequency MR field in this setting, not limited this time), then fill in the second virtual grid list to be constructed. After that, you can find the raster record according to the same-frequency MR field information in Table 5. If the corresponding raster record is found, the number of attempts in the original information is added to the number of attempts from the 4G network to the 5G network that day in the raster record. , The number of failures in the original information is added to the number of failures from the 4G network to the 5G network of the day in the grid record. If the grid record cannot be found according to the same frequency MR field information, a grid record is added in the second virtual grid list. For ease of understanding, the following uses Table 6 as an example to illustrate the second virtual grid list (taking the preset time interval of 1 day as an example). It should be noted that Table 6 only indicates that any terminal device is in the preset Grid information such as the number of failures and the number of attempts to access a 5G cell (for example, 5G cell 1) in the time interval. In fact, there are 5G cell 2, 5G cell 3, ..., 5G cell n, and Table 6 only shows them. A 5G cell (ie 5G cell 1).

Table 6: The second virtual grid list

5G小区1的IDID of 5G cell 1	101101
5G小区1对应的RSRP分段号RSRP segment number corresponding to 5G cell 1	00
当天4G网络到5G网络失败次数Number of failures from 4G network to 5G network that day	44
当天4G网络到5G网络尝试次数Number of attempts from 4G network to 5G network that day	212212
历史4G网络到5G网络失败次数Historical 4G network to 5G network failure times	1414
历史4G网络到5G网络尝试次数Historical 4G network to 5G network attempts	564564
……...	……...

It should be noted that in some embodiments of the present application, the second access network device may also update the second virtual grid list according to a preset period to delete invalid grids and reduce the number of redundant grids. It should also be 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. Do not repeat it.

409. The target terminal device returns to the 5G network through handover.

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

First, the second access network device determines the target RSRP segment number and the second target in the second virtual grid list corresponding to the target cell ID according to the acquired target MR of the current period (that is, the same frequency MR acquired this time) A grid, the second target grid includes the target RSRP segment number, the target cell ID, the number of attempts, and the number of failures. In other words, the second access network device searches the second virtual grid list for the cell ID and RSRP segment number corresponding to the cell ID and RSRP segment number of the 5G cell in the same frequency MR obtained this time. The historical grid information and the grid information in the current cycle are used to determine whether the target terminal device is switched from the 4G network to the 5G network. There are three results of the judgment here, which are explained separately below:

First, the second access network device judges the type of the second target grid according to the above grid information. It should be noted that the judgment principle is similar to that of the first access network device judging the type of the first virtual grid. I will not repeat it here.

After that, the second access network device judges the type of the second target grid according to the above grid information, and there are three results:

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.

Result 2. 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 any terminal device that establishes a connection with the second access network device Is the historical switching form of the 4G network switched to the 5G network in a blind manner? If it is, the target terminal device is switched from the 4G network to the 5G network in a blind manner; if not, the target terminal device is switched from the 4G network to the 5G network in a measured manner.

Result 3. 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 any terminal device that establishes a connection with the second access network device Is the historical switching form of the 4G network switched to the 5G network in a blind manner? Then the target device performs handover according to a preset method. For example, the second access network device can randomly select a preset percentage (for example, 5%) of terminal devices to perform the handover from the 5G network to the 3G network based on the measurement method, and the remaining 95% %, the handover is not performed. If the target terminal device is exactly at the above 5%, the measurement mode is switched, and if the target terminal device is at the above 95%, the handover is not performed. For another example, if the second access network device determines that the second virtual grid type is the third type, it simply does not perform handover. There is no restriction on the preset method here.

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 by switching, the first access network device can re-establish the second connection with the target terminal device.

2. A scenario where the target terminal device is first switched from a 5G network to a 4G network, and then from a 4G network to a 3G network.

Referring to FIG. 5, an embodiment of the present application provides another method for interoperating between different access network devices, which is specifically described as follows.

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

502. The target terminal device initiates a voice service.

If VONR is not deployed on the NR network and VOLTE is not deployed on the LTE network, 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 undertaken on the 3G network side.

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

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

It should be noted that, in some implementation manners of the present application, the manner in which the first access network device constructs the third virtual grid oriented to the 4G cell can be performed through the following steps:

Step 1. The first access network device obtains the MR periodically reported by the target terminal device, the MR is obtained by the target terminal device through the same frequency period measurement, and the MR includes the RSRP value of the 4G cell.

Step 2. The first access network device processes the periodically reported MR, that is, segments the acquired RSRP value to obtain each RSRP segment number and the RSRP interval value corresponding to each RSRP segment number, The cell ID of the 4G cell corresponding to each RSRP segment number.

For ease of understanding, the following takes Table 7 as an example for description: First, the first access network device divides the RSRP value measured in the MR into segments according to the preset segmentation step (in Table 7, the segmentation step is Take 3dB as an example. In fact, the segment step size can be any value set by the user, such as 4dB, 10DB, etc., which are not limited here), because the agreement stipulates that the RSRP value range is [-156, -31 ], then according to the segmentation form with the segmentation step length of 3dB, the different RSRP interval values, the RSRP segment number corresponding to each RSRP interval value, and the 4G cell corresponding to each RSRP interval value can be obtained as shown in Table 7. Cell ID. For example, the third column in Table 7 can be arranged in ascending order of cell ID values. Table 7 shows that the 4G cell IDs corresponding to the first five RSRP intervals are 201, 202, 203, 203, 204.

Table 7: Correspondence between RSRP interval value, RSRP segment number, and cell ID of 4G cell

RSRP区间取值RSRP interval value	RSRP分段号RSRP segment number	4G小区的小区IDCell ID of the 4G cell
[-156,-153)[-156,-153)	00	201201
[-153,-150)[-153,-150)	11	202202
[-150,-147)[-150,-147)	22	203203
[-147,-144)[-147,-144)	33	203203
[-144,-141)[-144,-141)	44	204204
……...	……...	……...

Since 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 the same-frequency MR field information table shown in Table 8. 8 includes the MR reporting time, the cell ID of each 4G cell, and the RSRP segment number corresponding to the cell ID. It should be noted that the first access network device will automatically classify the RSRP segment number to which the cell ID of each 4G cell belongs according to the value of the segmented RSRP interval as shown in Table 8. This is a table that is automatically generated based on the MR reported by the target terminal device (because the RSRP segment number has been assigned by the first access network device, at this time Table 8 only needs to be automatically generated according to the algorithm).

Table 8: In-frequency MR field information table

MR上报时间MR reporting time	2019.09.15 5:002019.09.15 5:00
4G小区1的IDID of 4G cell 1	201201
4G小区1的RSRP分段号RSRP segment number of 4G cell 1	00
4G小区2的IDID of 4G cell 2	202202
4G小区2的RSRP分段号RSRP segment number of 4G cell 2	11
4G小区3的IDID of 4G cell 3	203203
4G小区3的RSRP分段号RSRP segment number of 4G cell 3	2、32, 3
4G小区4的IDID of 4G cell 4	204204
4G小区4的RSRP分段号RSRP segment number of 4G cell 4	44
……...	……...

Step 3. After that, the first access network device counts the preset time interval (for example, 24 hours, 48 hours, 72 hours, the preset time interval can be set by yourself, and it is not limited here). The number of attempts and failures for the terminal device connected to the networked device to switch from the 5G network to the 4G network. In some implementations of this application, it is necessary to count the number of attempts and the number of failures of a terminal device to switch from a 5G network to a 4G network in two scenarios:

Counting the number of failures: When the target terminal device performs the 5G network to the 4G network handover process, if the first access network device obtains the handover failure message returned by the target terminal device, the number of failures is recorded once.

Scenario 2, measurement timeout scenario.

When the target terminal device measures the LTE neighboring cell under the pressure model, if the first access network device is within the preset duration (for example, within 20 seconds, the preset duration can be set by itself, and it is not limited here). When the reported MR is reached, the measurement of the target terminal device is stopped, and the first access network device records the number of attempts and the number of failures at this time.

Step 4. Finally, the first access network device constructs a third virtual grid list according to each RSRP segment number, each cell ID, the number of attempts and the number of failures. In the preset time interval, the number of attempts and failures for any terminal device to switch from a 5G network to a 4G network are counted in the grid within the preset time interval of the current cycle. If the preset time interval is 1 day, the statistics are calculated In the grid of the day. The specific process can be: 5G network to 4G network interoperability original information (that is, the number of attempts and the number of failures), if there is a preset time period (such as: 5 seconds, 8 seconds, 10 seconds, etc., the preset time period can be free Set the same frequency MR field in this time, it is not limited), then fill it in the constructed third virtual grid list. After that, you can find the raster record according to the same frequency MR field information in Table 8. If the corresponding raster record is found, the number of attempts in the original information is added to the number of attempts from the 5G network to the 4G network that day in the raster record , The number of failures in the original information is added to the number of failures from the 5G network to the 4G network that day in the grid record. If the raster record cannot be found based on the same frequency MR field information, a new raster record is added to the third virtual raster list. For ease of understanding, the following uses Table 9 as an example to illustrate the third virtual grid list (taking the preset time interval of 1 day as an example). It should be noted that Table 9 only indicates that any terminal device is in the preset Grid information such as the number of failures and the number of attempts to access a 4G cell (for example, 4G cell 1) within the time interval, there are actually 4G cells 2, 4G cells 3,..., 4G cells n, and Table 9 only shows them A 4G cell (ie 4G cell 1).

Table 9: The third virtual grid list

4G小区1的IDID of 4G cell 1	201201
4G小区1对应的RSRP分段号RSRP segment number corresponding to 4G cell 1	00
当天5G网络到4G网络失败次数Number of 5G network to 4G network failures that day	4242
当天5G网络到4G网络尝试次数Number of 5G network to 4G network attempts that day	234234
历史5G网络到4G网络失败次数Historical 5G network to 4G network failure times	7878
历史5G网络到4G网络尝试次数Historical 5G network to 4G network attempts	634634
……...	……...

It should be noted that, in some embodiments of the present application, the first access network device may also update the third virtual grid list according to a preset period to delete invalid grids and reduce the number of redundant grids. It should also be noted that the manner in which the first access network device updates the third 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. Do not repeat it.

504. The target terminal device switches from the 5G network to the 4G network based on the third virtual grid.

After the first access network device constructs the third virtual grid for the 4G cell, the target terminal device will switch from the 5G network to the 4G network based on the first virtual grid. The specific implementation steps may be:

First, the first access network device determines the target RSRP segment number and the third target in the third virtual grid list corresponding to the target cell ID according to the acquired target MR of the current period (that is, the same frequency MR acquired this time). A grid, the third target grid includes the target RSRP segment number, the target cell ID, the number of attempts, and the number of failures. In other words, the first access network device queries the third virtual grid list for the cell ID and RSRP segment number corresponding to the cell ID and RSRP segment number of the 4G cell in the same frequency MR obtained this time. The historical grid information and the grid information in the current cycle are used to determine whether the target terminal device is switched from the 5G network to the 4G network. There are three results of the judgment here, which are explained separately below:

First, the first access network device judges the type of the third target grid according to the above grid information. It should be noted that the judgment principle is similar to that of the first access network device judging the type of the first virtual grid. I will not repeat it here.

After that, the first access network device judges the type of the third target grid according to the above grid information, and there are three results:

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 (eg, through EPS FB method to return).

Result 2. 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 any connection established with the first access network device Whether the historical switching mode of the terminal device is switched from the 5G network to the 4G network in a blind manner; if so, the target terminal device is returned from the 5G network to the 4G network in a blind manner; if not, the target terminal device is switched from the 5G network to the 4G network in a blind manner; The 5G network returns to the 4G network.

Result 3. If the first access network device determines that the type of the third target grid is the third type, the target terminal device performs handover in a preset manner. For example, the first access network device can randomly select a preset percentage (eg, 5%) of terminal devices to perform the handover from the 5G network back to the 4G network based on the measurement method, and the remaining 95% will not perform handover. If the target terminal device If it is exactly the above 5%, then the measurement mode switching is performed, and if the target terminal device is exactly the above 95%, the switching is not performed. For another example, if the first access network device determines that the third virtual grid type is the third type, it simply does not perform handover. There is no restriction on the preset method here.

505. The second access network device establishes a third connection with the target terminal device, and constructs a fourth virtual grid facing the 3G cell.

After that, the second access network device establishes a third connection with the target terminal device, and constructs a fourth virtual grid facing the 3G cell. It should be noted that, in some embodiments of the present application, the construction of the fourth virtual grid for the 3G cell by the second access network device can be performed through the following steps:

Step 1. The second access network device obtains the MR periodically reported by the target terminal device, the MR is obtained by the target terminal device through the same frequency period measurement, and the MR includes the RSRP value of the 3G cell.

Step 2. The second access network device processes the periodically reported MR, that is, segments the acquired RSRP value to obtain each RSRP segment number and the RSRP interval value corresponding to each RSRP segment number, The cell ID of the 3G cell corresponding to each RSRP segment number.

For ease of understanding, the following takes Table 10 as an example: First, the second access network device segments the RSRP value measured in the MR according to the preset segmentation step (in Table 10, the segmentation step is still used). The length is 3dB as an example. In fact, the segment step length can be any value set by the user, such as 4dB, 10dB, etc., which are not limited here), because the agreement stipulates that the RSRP value range is [-156,- 31], then according to the segmentation form with the segmentation step length of 3dB, the different RSRP interval values in Table 10, the RSRP segment number corresponding to each RSRP interval value, and the 3G cell corresponding to each RSRP interval value can be obtained. The cell ID. For example, the third column in Table 10 can be arranged in ascending order of cell ID values. Table 10 shows that the cell IDs corresponding to the first six RSRP intervals are 007, 007, 007, 008, and 009. , 010.

Table 10: Correspondence between RSRP interval value, RSRP segment number, and cell ID of 3G cell

RSRP区间取值RSRP interval value	RSRP分段号RSRP segment number	3G小区的小区IDCell ID of the 3G cell
[-156,-153)[-156,-153)	00	007007
[-153,-150)[-153,-150)	11	007007
[-150,-147)[-150,-147)	22	007007
[-147,-144)[-147,-144)	33	008008
[-144,-141)[-144,-141)	44	009009
[-141,-138)[-141,-138)	55	010010
……...	……...	……...

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

Table 11: In-frequency MR field information table

MR上报时间MR reporting time	2019.09.16 12:002019.09.16 12:00
3G小区11的IDID of 3G cell 11	007007
3G小区11的RSRP分段号RSRP segment number of 3G cell 11	0、1、20, 1, 2
3G小区12的IDID of 3G cell 12	008008
3G小区12的RSRP分段号RSRP segment number of 3G cell 12	33
3G小区13的IDID of 3G cell 13	009009
3G小区13的RSRP分段号RSRP segment number of 3G cell 13	44
5G小区14的IDID of 5G cell 14	010010
3G小区14的RSRP分段号RSRP segment number of 3G cell 14	55
……...	……...

Step 3. After that, the second access network device counts the preset time interval (for example, 24 hours, 48 hours, 72 hours, the preset time interval can be set by yourself, and there is no limitation here). The number of attempts and failures for the terminal device connected to the networked device to switch from the 4G network to the 3G network. In some implementations of this application, it is necessary to count the number of attempts and the number of failures of a terminal device to switch from a 4G network to a 3G network in two scenarios:

Counting the number of failures: When the target terminal device performs the switch from 4G network to 3G network, if the second access network device obtains the switching failure message returned by the target terminal device, the number of failures is recorded once.

Scenario 2, measurement timeout scenario.

When the target terminal device measures the UMTS neighboring cell by pressing the mold, if the second access network device is within the preset time (for example, within 20 seconds, the preset time can be set by itself, and there is no limitation here). When the reported MR is reached, the measurement to the target terminal device is stopped. At this time, the second access network device records the number of attempts and the number of failures.

Step 4. Finally, the second access network device constructs a fourth virtual grid list according to each RSRP segment number, each cell ID, the number of attempts and the number of failures. Within the preset time interval, the number of attempts and failures for any terminal device to switch from a 4G network to a 3G network are counted in the grid within the preset time interval of the current cycle. If the preset time interval is 1 day, the statistics In the grid of the day. The specific process can be: 4G network to 3G network interoperability original information (that is, the number of attempts and the number of failures), if there is a preset time period (such as: 5 seconds, 8 seconds, 10 seconds, etc.), the preset time period can be free Set the same frequency MR field in this setting, not limited this time), then fill in the fourth virtual grid list to be constructed. After that, you can find the raster record according to the same frequency MR field information in Table 11. If the corresponding raster record is found, the number of attempts in the original information is added to the number of attempts from the 4G network to the 3G network in the raster record that day , Add the number of failures in the original information to the number of failures from the 4G network to the 3G network of the day in the grid record. If the grid record cannot be found according to the same frequency MR field information, a grid record is added in the fourth virtual grid list. For ease of understanding, the following uses Table 12 as an example to illustrate the fourth virtual grid list (taking the preset time interval of 1 day as an example). It should be noted that Table 12 only indicates that any terminal device is in the preset Grid information such as the number of failed accesses to a 3G cell (for example, 3G cell 11) and the number of attempts in the time interval. In fact, there are 3G cell 12, 3G cell 13, ..., 5G cell 1n. A 3G cell (ie, 3G cell 11).

Table 12: The fourth virtual grid list

3G小区11的IDID of 3G cell 11	007007
3G小区11对应的RSRP分段号RSRP segment number corresponding to 3G cell 11	0、1、20, 1, 2
当天4G网络到3G网络失败次数Number of failures from 4G network to 3G network that day	24twenty four
当天4G网络到3G网络尝试次数Number of 4G to 3G network attempts that day	356356
历史4G网络到3G网络失败次数Historical 4G network to 3G network failure times	5252
历史4G网络到3G网络尝试次数Historical 4G network to 3G network attempts	687687
……...	……...

It should be noted that in some embodiments of the present application, the second access network device may also update the fourth virtual grid list according to a preset period to delete invalid grids and reduce the number of redundant grids. It should also be 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. Do not repeat it.

506. The target terminal device switches from the 4G network to the 3G network based on the fourth virtual grid.

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

First, the second access network device determines the target RSRP segment number and the fourth target in the fourth virtual grid list corresponding to the target cell ID according to the acquired target MR of the current period (that is, the same-frequency MR acquired this time) A grid, the fourth target grid includes the target RSRP segment number, the target cell ID, the number of attempts, and the number of failures. In other words, the second access network device searches the fourth virtual grid list for the cell ID and RSRP segment number corresponding to the cell ID and RSRP segment number of the 3G cell in the same frequency MR obtained this time. The historical grid information and the grid information in the current cycle are used to determine whether the target terminal device is switched from the 4G network to the 3G network. There are three results of the judgment here, which are explained separately below:

First, the second access network device judges the type of the fourth target grid according to the above grid information. It should be noted that the judgment principle is similar to that of the first access network device judging the type of the first virtual grid. I will not repeat it here.

After that, the second access network device judges the type of the fourth target grid according to the grid information, and there are three results:

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 switches from the 4G network to the 3G network in a blind manner.

Result 2. 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 any terminal device that establishes a connection with the second access network device Is the historical switching form of the switch from the 4G network to the 3G network in a blind manner? If it is, the target terminal device is switched from the 4G network to the 3G network in a blind manner; if not, the target terminal device is switched from the 4G network to the 3G network in a measured manner.

Result 3. 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 any terminal device that establishes a connection with the second access network device Is the historical switching form of the switch from the 4G network to the 3G network in a blind manner? Then the target device performs handover in a preset manner. For example, the second access network device can randomly select a preset percentage (for example, 5%) of terminal devices to perform the handover from 4G network to 3G network based on the measurement method, and the remaining 95% %, the handover is not performed. If the target terminal device is exactly at the above 5%, the measurement mode is switched, and if the target terminal device is 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, it simply does not perform handover. There is no restriction on the preset method here.

507. The third access network device bears the voice service.

508. After the voice service ends, the third access network device sends a handover request message to the second access network device, so that the target terminal device returns to the 4G network through handover/redirection.

509. The second access network device parses the handover request message.

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

After the second access network device recognizes that the target terminal device is a terminal device supporting a 5G network, it will construct a fifth virtual grid for the 5G cell. The construction of the fifth virtual grid for the 5G cell by the second access network device may include: First, the second access network device obtains the periodically reported MR, and the MR is measured by the target terminal device through the same frequency period; The MR includes the RSRP value of the 5G cell; afterwards, the second access network device segments the RSRP value to obtain each RSRP segment number, the RSRP interval value corresponding to each RSRP segment number, and each RSRP segment number. The cell ID of the 5G cell corresponding to the RSRP segment number; in addition, the second access network device will also count any terminal device that has established a connection with the second access network device in the preset time interval to switch from the 4G network to the 5G network The number of attempts and the number of failures; finally, the second access network device constructs a fifth virtual grid list according to the RSRP segment number, each cell ID, the number of attempts, and the number of failures. It should be noted that in this embodiment of the present application, the process of constructing the fifth virtual grid for 5G cells by the second access network device is similar to that of constructing the second virtual grid for 5G cells by the second access network device. I will not repeat it here.

It should also be noted that, in some embodiments of the present application, the second access network device may also update the fifth virtual grid list according to a preset period, and the update method is the same as that of the first access network device. It is assumed that the periodic updating of the first virtual grid list is similar, and will not be repeated here.

511. The target terminal device returns to the 5G network through handover.

After the second access network device constructs the fifth virtual grid facing the 5G cell, the target terminal device can 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 first determine the type of the fifth virtual grid based on the manner in which the fifth virtual grid is switched from the 4G network to the 5G network, which may specifically be: the second connection The network access device determines the target RSRP segment number and the fifth target grid in the fifth virtual grid list corresponding to the target cell ID according to the acquired target MR of the current period, where the fifth target grid includes the The target RSRP segment number, the target cell ID, the number of attempts, and the number of failures; then, the second access network device determines the type of the fifth target grid; if the second access The network device determines that the type of the fifth target grid is the first type, and 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 determines whether the history switching mode of any terminal device that establishes a connection with the second access network device is Switch from the 4G network to the 5G network in a blind manner; if so, the target terminal device switches from the 4G network to the 5G network in a blind manner; if not, the target terminal device switches from the 4G network to the 5G network in a measured manner. If the second access network device determines that the type of the fifth target grid is the third type, the target device performs handover according to a preset manner.

It should be noted that how the above-mentioned second access network device determines the type of the fifth target grid based on the grid information and the subsequent operation process are the same as how the second access network device determines the second target grid based on the grid information. The type and the subsequent operation process (that is, the operations corresponding to Result 1, Result 2, and Result 3 respectively) are similar, and will not be repeated here.

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

It should also be noted that in this embodiment of the present application, steps 507-512 are similar to steps 405-410 in the embodiment corresponding to FIG. 4, and will not be repeated here.

In the embodiment of the present application, the first access network device first reduces the access delay by constructing a third virtual grid for 4G cells, that is, the target terminal device is switched from the 5G network to 4G based on the third virtual grid. After that, the second access network device constructs a fourth virtual grid oriented to the 3G cell to further reduce the access delay, that is, the target terminal device is based on the fourth virtual grid. Then switch from the 4G network to the 3G network (for example, through the CSFB method), and the second access network device again reduces the return delay by constructing a fifth virtual grid for the 5G cell, thereby reducing the different access networks The total delay of interoperability between devices improves the user experience.

This application also provides a data processing device 600. Please refer to FIG. 6, an embodiment of the data processing device in the embodiment of this application. The data processing device may be an access network device (for example, it may be the one in the above embodiment of the application). The first access network device, the second access network device, the third access network device), or the chip or chip system located on each different access network device, the data processing device can be used to execute the data processing device shown in Figure 2-5. The steps performed by different access network devices in any of the illustrated embodiments, for example, if the data processing device is the first access network device (for example, NG-RAN), the data processing device is used to perform FIG. 2 Steps correspondingly executed by the first access network device in any of the embodiments shown in -5; if the data processing device is a second access network device (for example, eNodeB), the data processing device is used to execute FIG. 2 Steps correspondingly executed by the second access network device in any of the embodiments shown in -5; if the data processing device is a third access network device (for example, RNC or BSC), then the data processing device is used to execute For the steps correspondingly executed by the third access network device in any of the embodiments shown in FIGS. 2-5, reference may be made to the related description in the foregoing method embodiments for details, and details are not repeated here.

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

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

In an implementation manner, the data processing device 600 may include more or less components than that shown in FIG. 6, which is only an exemplary description in this application and is not limited.

Referring to FIG. 7, an embodiment of the present application also provides a communication system, which includes: 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 device shown in FIG. 6 (when the data processing device is used as the first access network device), which is used to perform any of the implementations shown in FIGS. 2-5. All or part of the steps performed by the first access network device in the manner.

The second access network device may include the data processing device shown in FIG. 6 (when the data processing device is used as the second access network device), which is used to perform any of the implementations shown in FIGS. 2-5. All or part of the steps performed by the second access network device in the manner.

The third access network device may include the data processing device shown in FIG. 6 (when the data processing device is used as the third access network device), which is used to perform any of the implementations shown in FIGS. 2-5. All or part of the steps performed by the third access network device in the manner.

In a possible implementation manner, the communication system may further include a target terminal device (not shown in FIG. 7), which is used to execute the target terminal device in any of the foregoing embodiments shown in FIGS. 2-5. All or part of the steps.

The embodiments of the present application also provide a chip system, the chip system includes a processor, used to support the data processing device to achieve the functions involved in the above aspects, for example, send or process the data and/or information involved in the above methods . In a possible design, the chip system further includes a memory, and the memory is used to store necessary program instructions and data. The chip system can be composed of chips, and can also include chips and other discrete devices.

In another possible design, when the data processing apparatus is a chip in the first access network device, the second access network device, or the third access network device, the chip includes: a processing unit and a communication unit, The processing unit may be, for example, a processor, and the communication unit may be, for example, an input/output interface, a pin, or a circuit. The processing unit can execute the computer execution instructions stored in the storage unit, so that the chip in the first access network device, the second access network device, or the third access network device can execute any one of the foregoing Figures 2-5 The embodiments correspond to the steps of the method executed by the first access network device, the second access network device, or the third access network device. Optionally, the storage unit is a storage unit in the chip, such as a register, a cache, etc., and the storage unit may also be the first access network device, the second access network device, or the third access network device. A storage unit located outside the chip in a network device, etc., such as read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory, RAM) and so on.

The embodiment of the present application also provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a computer, the method flow related to the data processing device in any of the foregoing method embodiments is implemented. Correspondingly, the computer may be the aforementioned data processing device. The data processing apparatus includes a first access network device, a second access network device, or a third access network device.

The embodiments of the present application also provide a computer program or a computer program product including a computer program. When the computer program is executed on a computer, the computer will enable the computer to implement the data processing in any of the foregoing method embodiments. Device-related method flow. Correspondingly, the computer may be the aforementioned data processing device.

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

The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center. Transmission to another website site, computer, server or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be stored by a computer or a data storage device such as a server or a data center integrated with one or more available media. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)).

It should be understood that the processor mentioned in this application can be a central processing unit (Central Processing Unit, CPU), or other general-purpose processors, digital signal processors (Digital Signal Processors, DSPs), and application specific integrated circuits (Application Specific Integrated Circuits). Integrated Circuit, ASIC), off-the-shelf programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also 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 multiple, and may be specifically adjusted according to actual application scenarios. This is only an exemplary description and is not limited. The number of memories in the embodiment of the present application may be one or multiple, and may be specifically adjusted according to actual application scenarios. This is only an exemplary description and is not limited.

It should also be noted that when the data processing device includes a processor (or 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. It is adjusted according to actual application scenarios and is not limited.

Those skilled in the art can clearly understand that, for the convenience and conciseness of the description, the specific working process of the above-described system, device, and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method may be implemented in other ways. For example, the device embodiments described above are merely illustrative, for example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or It can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

In addition, the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or software functional unit.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solution of the present application essentially or the part that contributes to the existing technology or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , Including several instructions to make a computer device (which can be a personal computer, a server, or other devices, etc.) execute all or part of the steps of the methods described in the embodiments in Figures 2-5 of this application.

It should be understood that the storage medium or memory mentioned in this application may include volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. Among them, the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), and electrically available Erase programmable read-only memory (Electrically EPROM, EEPROM) or flash memory. The volatile memory may be random access memory (Random Access Memory, RAM), which is used as an external cache. By way of exemplary but not restrictive description, many forms of RAM are available, such as static random access memory (Static RAM, SRAM), dynamic random access memory (Dynamic RAM, DRAM), synchronous dynamic random access memory (Synchronous DRAM, SDRAM), Double Data Rate Synchronous Dynamic Random Access Memory (Double Data Rate SDRAM, DDR SDRAM), Enhanced Synchronous Dynamic Random Access Memory (Enhanced SDRAM, ESDRAM), Synchronous Link Dynamic Random Access Memory (Synch link DRAM, SLDRAM) and Direct Rambus RAM (DR RAM).

It should be noted that the memories described herein are intended to include, but are not limited to, these and any other suitable types of memories.

As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions recorded in the embodiments are modified, or some of the technical features are equivalently replaced; these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

A method for interoperating between different access network devices, which is characterized in that it includes:

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

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

In response to the trigger instruction, the first access network device constructs a first virtual grid for the 3G cell, and disconnects the first connection, so that the voice service is transferred from the 5G network based on the first virtual grid. Return to 3G network;

When the voice service ends, the first access network device re-establishes a second connection with the target terminal device, and the second connection is constructed by the second access network device for a 5G cell-oriented second virtual Grid trigger, the step of constructing the 5G-oriented cell by the second access network device is triggered by a handover request message sent by the third access network device to the second access network device, and 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, and the private information is used to indicate that the target terminal device is a terminal device supporting the 5G network.
The method according to claim 1, wherein the trigger instruction comprises:

The signal quality of the 5G network in the area where the target terminal device is located is weaker than the signal quality of the 3G network, and the LTE network does not deploy VOLTE.
The method according to any one of claims 1-2, wherein the construction of the first virtual grid for the 3G cell by the first access network device comprises:

Acquiring, by the first access network device, a periodically reported MR, the MR being measured by the target terminal device through the same frequency period, and the MR including the RSRP value of the 3G cell;

The first access network device segments the RSRP value to obtain each RSRP segment number, the RSRP interval value corresponding to each RSRP segment number, and the 3G cell information corresponding to each RSRP segment number. Cell ID;

The first access network device counts the number of attempts and the number of failures for any terminal device that has established a connection with the first access network device to switch from the 5G network to the 3G network within a preset time interval;

The first access network device constructs a first virtual grid list according to each RSRP segment number, each cell ID, the number of attempts, and the number of failures.
The method according to claim 3, wherein the method further comprises:

The first access network device updates the first virtual grid list according to a preset period.
The method according to any one of claims 3-4, wherein the returning of the voice service from the 5G network to the 3G network based on the first virtual grid comprises:

The first access network device determines the target RSRP segment number and the first target grid in the first virtual grid list corresponding to the target cell ID according to the acquired target MR of the current period, and the first target The grid includes the target RSRP segment number, the target cell ID, the number of attempts, and the number of failures;

Determining the type of the first target grid by the first access network device;

If the first access network device determines that the type of the first target grid is the first type, the voice service is returned from the 5G network to the 3G network in a blind manner.
The method according to claim 5, wherein the method further comprises:

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 the historical voice service is returned from the 5G network in a blind manner. The 3G network;

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

If not, the voice service is returned from the 5G network to the 3G network in a measured manner.
The method according to any one of claims 5-6, wherein the method further comprises:

If the first access network device determines that the type of the first target grid is the third type, the voice service performs handover according to a preset manner.
A method for interoperating between different access network devices, which is characterized in that it includes:

When the voice service ends, the second access network device obtains a handover request message sent by the third access network device. The handover request message is used to instruct the target terminal device to switch from the 3G network to the 4G network. The handover request The message carries private information, the private information is used to indicate that the target terminal device is a terminal device supporting a 5G network, and the voice service is a voice returned from the 5G network to the 3G network based on the first virtual grid For services, the first virtual grid is constructed by the first access network device in response to a trigger instruction for the 3G cell;

Identifying, by the second access network device, the target terminal device as a terminal device supporting the 5G network according to the private information;

The second access network device constructs a second virtual grid facing the 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 method according to claim 8, wherein the trigger instruction comprises:

The signal quality of the 5G network in the area where the target terminal device is located is weaker than the signal quality of the 3G network, and the LTE network does not deploy VOLTE.
The method according to any one of claims 8-9, wherein the construction of the second virtual grid for the 5G cell by the second access network device comprises:

Acquiring, by the second access network device, a periodically reported MR, where the MR is measured by the target terminal device through a same frequency period, and the MR includes the RSRP value of the 5G cell;

The second access network device segments the RSRP value to obtain each RSRP segment number, the RSRP interval value corresponding to each RSRP segment number, and the 5G corresponding to each RSRP segment number. The cell ID of the cell;

The second access network device counts the number of attempts and the number of failures of any terminal device that has established a connection with the second access network device from the 4G network to the 5G network within a preset time interval;

The second access network device constructs a second virtual grid list according to each RSRP segment number, each cell ID, the number of attempts, and the number of failures.
The method according to claim 10, wherein the method further comprises:

The second access network device updates the second virtual grid list according to a preset period.
The method according to any one of claims 10-11, wherein the target terminal device switching from a 4G network to a 5G network based on the second virtual grid comprises:

The second access network device determines the target RSRP segment number and the second target grid in the second virtual grid list corresponding to the target cell ID according to the acquired target MR of the current period, and the second target The grid includes the target RSRP segment number, the target cell ID, the number of attempts, and the number of failures;

Determining the type of the second target grid by the second access network device;

If the second access network device determines that the type of the second target grid is the first type, the target terminal device switches from the 4G network to the 5G network in a blind manner.
The method according to claim 12, wherein the method further comprises:

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 any terminal device that establishes a connection with the second access network device Whether the historical handover form of is switched from the 4G network to the 5G network in a blind manner;

If yes, the target terminal device switches from the 4G network to the 5G network in a blind manner;

If not, the target terminal device is switched from the 4G network to the 5G network in a measurement manner.
The method according to any one of claims 12-13, wherein the method further comprises:

If the second access network device determines that the type of the second target grid is the third type, the target device performs handover according to a preset manner.
A method for interoperating between different access network devices, which is characterized in that it includes:

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

If VONR is not deployed on the NR network and VOLTE is not deployed on the LTE network, when the target terminal device initiates a voice service, the first access network device constructs a third virtual grid facing the 4G cell, and disconnects the second A connection so that the target terminal device switches from a 5G network to a 4G network based on the third virtual grid, and switches from the 4G network to a 3G network based on the fourth virtual grid, so that the target terminal device is in The 3G network initiates the voice service, and the fourth virtual grid is constructed by a second access network device facing the 3G cell;

When the voice service ends, the first access network device re-establishes a second connection with the target terminal device, and the second connection is constructed by the second access network device for the 5G cell-oriented first connection. Five virtual grid triggers, the step of constructing the 5G-oriented cell by the second access network device is triggered by a handover request message sent by the third access network device to the second access network device, the handover request message Used to instruct the target terminal device to switch from the 3G network to the 4G network, the switching request message carries private information, and the private information is used to indicate that the target terminal device is a terminal supporting the 5G network equipment.
The method according to claim 15, wherein the construction of the third virtual grid for the 4G cell by the first access network device comprises:

Acquiring, by the first access network device, a periodically reported MR, where the MR is measured by the target terminal device through an intra-frequency period measurement, and the MR includes the RSRP value of the 4G cell;

The first access network device segments the RSRP value to obtain each RSRP segment number, the RSRP interval value corresponding to each RSRP segment number, and the 4G cell corresponding to each RSRP segment number. Cell ID;

The first access network device counts the number of attempts and the number of failures for any terminal device that has established a connection with the first access network device to switch from a 5G network to a 4G network within a preset time interval;

The first access network device constructs a third virtual grid list according to each RSRP segment number, each cell ID, the number of attempts, and the number of failures.
The method according to claim 16, wherein the method further comprises:

The first access network device updates the third virtual grid list according to a preset period.
The method according to any one of claims 16-17, wherein the target terminal device switching from a 5G network to a 4G network based on the third virtual grid comprises:

The first access network device determines the target RSRP segment number and the third target grid in the third virtual grid list corresponding to the target cell ID according to the acquired target MR of the current period, and the third target The grid includes the target RSRP segment number, the target cell ID, the number of attempts, and the number of failures;

Determining the type of the third target grid by the first access network device;

If the first access network device determines that the type of the third target grid is the first type, the target terminal device switches from the 5G network to the 4G network in a blind manner.
The method according to claim 18, wherein the method further comprises:

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 any terminal device that establishes a connection with the first access network device Whether the historical handover form of is switched from the 5G network to the 4G network in a blind manner;

If yes, the target terminal device switches from the 5G network to the 4G network in a blind manner;

If not, the target terminal device is switched from the 5G network to the 4G network in a measurement manner.
The method according to any one of claims 18-19, wherein the method further comprises:

If the first access network device determines that the third target grid is of the third type, the target terminal device performs handover according to a preset manner.
A method for interoperating between different access network devices, which is characterized in that it includes:

If VONR is not deployed on the NR network and VOLTE is not deployed on the LTE network, when the target terminal device initiates a voice service, the second access network device establishes a third connection with the target terminal device, and the third connection is made by the first connection. Triggered by the third virtual grid oriented to the 4G cell constructed by the connected equipment;

The second access network device constructs a fourth virtual grid oriented to the 3G cell, so that the target terminal device switches from a 4G network to a 3G network based on the fourth virtual grid, and causes the target terminal device to switch from a 4G network to a 3G network. The 3G network initiates the voice service;

When the voice service ends, 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 instruct the target terminal device to switch from the 3G network to the In the 4G network, the handover request message carries private information, and the private information is used to indicate that the target terminal device is a terminal device supporting the 5G network;

Identifying, by the second access network device, the target terminal device as a terminal device supporting the 5G network according to the private information;

The second access network device constructs a fifth virtual grid facing the 5G cell, so that the target terminal device is switched from the 4G network to the 5G network based on the fifth virtual grid.
The method according to claim 21, wherein the construction of the fourth virtual grid for the 3G cell by the second access network device comprises:

Acquiring, by the second access network device, a periodically reported MR, the MR being measured by the target terminal device through an intra-frequency period measurement, and the MR including the RSRP value of the 3G cell;

The second access network device segments the RSRP value to obtain each RSRP segment number, the RSRP interval value corresponding to each RSRP segment number, and the 3G corresponding to each RSRP segment number. The cell ID of the cell;

The second access network device counts the number of attempts and the number of failures of any terminal device that has established a connection with the second access network device from the 4G network to the 3G network within a preset time interval;

The second access network device constructs a fourth virtual grid list according to each RSRP segment number, each cell ID, the number of attempts, and the number of failures.
The method according to claim 22, wherein the method further comprises:

The second access network device updates the fourth virtual grid list according to a preset period.
The method according to any one of claims 22-23, wherein the target terminal device switching from a 4G network to a 3G network based on the fourth virtual grid comprises:

The second access network device determines the target RSRP segment number and the fourth target grid in the fourth virtual grid list corresponding to the target cell ID according to the acquired target MR of the current period, and the fourth target The grid includes the target RSRP segment number, the target cell ID, the number of attempts, and the number of failures;

Determining the type of the fourth target grid by the second access network device;

If the second access network device determines that the type of the fourth target grid is the first type, the target terminal device switches from the 4G network to the 3G network in a blind manner.
The method according to claim 24, wherein the method further comprises:

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 any terminal device that establishes a connection with the second access network device Whether the historical handover form of is switched from the 4G network to the 3G network in a blind manner;

If yes, the target terminal device switches from the 4G network to the 3G network in a blind manner;

If not, the target terminal device is switched from the 4G network to the 3G network in a measurement manner.
The method according to any one of claims 24-25, wherein the method further comprises:

If the second access network device determines that the type of the fourth target grid is the third type, the target device performs handover according to a preset manner.
The method according to any one of claims 21-26, wherein the second access network device constructing a 5G cell-oriented fifth virtual grid comprises:

Acquiring, by the second access network device, a periodically reported MR, where the MR is measured by the target terminal device through a same frequency period, and the MR includes the RSRP value of the 5G cell;

The second access network device segments the RSRP value to obtain each RSRP segment number, the RSRP interval value corresponding to each RSRP segment number, and the 5G corresponding to each RSRP segment number. The cell ID of the cell;

The second access network device counts the number of attempts and the number of failures of any terminal device that has established a connection with the second access network device from the 4G network to the 5G network within a preset time interval;

The second access network device constructs a fifth virtual grid list according to each RSRP segment number, each cell ID, the number of attempts, and the number of failures.
The method according to claim 27, wherein the method further comprises:

The second access network device updates the fifth virtual grid list according to a preset period.
The method according to any one of claims 27-28, 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 the target RSRP segment number and the fifth target grid in the fourth virtual grid list corresponding to the target cell ID according to the acquired target MR of the current period, and the fifth target The grid includes the target RSRP segment number, the target cell ID, the number of attempts, and the number of failures;

Determining the type of the fifth target grid by the second access network device;

If the second access network device determines that the type of the fifth target grid is the first type, the target terminal device switches from the 4G network to the 5G network in a blind manner.
The method according to claim 29, wherein the method further comprises:

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 any terminal device that establishes a connection with the second access network device Whether the historical handover form of is switched from the 4G network to the 5G network in a blind manner;

If yes, the target terminal device switches from the 4G network to the 5G network in a blind manner;

If not, the target terminal device is switched from the 4G network to the 5G network in a measurement manner.
The method according to any one of claims 29-30, wherein the method further comprises:

If the second access network device determines that the type of the fifth target grid is the third type, the target device performs handover according to a preset manner.
A data processing device, characterized by comprising: a processor and a memory;

The memory is used to store programs;

The processor is configured to execute the program to implement the method according to any one of claims 1-7.
A data processing device, characterized by comprising: a processor and a memory;

The memory is used to store programs;

The processor is used to execute the program to implement the method according to any one of claims 8-14.
A data processing device, characterized by comprising: a processor and a memory;

The memory is used to store programs;

The processor is configured to execute the program to implement the method according to any one of claims 15-20.
A data processing device, characterized by comprising: a processor and a memory;

The memory is used to store programs;

The processor is configured to execute the program to implement the method according to any one of claims 21-31.
A communication system, characterized by comprising: 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 method according to any one of claims 1-7;

The second access network device is used to implement the method according to any one of claims 8-14;

The third access network device is configured to initiate a voice call to the target terminal device, and send a handover request message to the second access network device when the voice call ends.
A communication system, characterized by comprising: a first access network device, a second access network device, and a third access network device;

The first access network device is used to implement the method according to any one of claims 15-20;

The second access network device is used to implement the method according to any one of claims 21-31;

The third access network device is configured to initiate a voice call to the target terminal device, and send a handover request message to the second access network device when the voice call ends.
A computer program product containing instructions, which is characterized in that when it runs on a computer, the computer executes the method according to any one of claims 1-31.
A computer-readable storage medium, characterized by comprising instructions, which when run on a computer, causes the computer to execute the method according to any one of claims 1-31.
A data processing device, comprising a processor and a memory, characterized in that the processor is coupled with the memory, and is used to read and execute instructions stored in the memory, so as to implement as described in any one of claims 1-31 The steps of the method.
The device of claim 40, wherein the data processing device is a chip or a system on a chip.