CN116419346A

CN116419346A - Communication method, communication device, electronic equipment and storage medium

Info

Publication number: CN116419346A
Application number: CN202210010069.7A
Authority: CN
Inventors: 马泽芳; 苗守野; 王光全; 冯立华; 任驰; 马瑞涛
Original assignee: China United Network Communications Group Co Ltd
Current assignee: China United Network Communications Group Co Ltd
Priority date: 2022-01-05
Filing date: 2022-01-05
Publication date: 2023-07-11

Abstract

The application provides a communication method, a device, electronic equipment and a storage medium, relates to the technical field of communication, and solves the problem that in the prior art, voice service continuity of terminal equipment cannot be guaranteed when the terminal equipment roams in a 5G core network. The method comprises the following steps: the terminal equipment sends a first measurement report to the first access network equipment; the terminal equipment is terminal equipment for carrying out voice service in a first cell, the first cell belongs to a first PLMN network, and the first measurement report is used for indicating that the signal strength of the first cell and the signal strength of the second cell meet a connection state mobility event; the second cell belongs to a second PLMN network; the terminal equipment receives first indication information from first access network equipment, wherein the first indication information is used for indicating the terminal equipment to access a third cell; the third cell belongs to the first PLMN network; and responding to the first indication information, and accessing the third cell by the terminal equipment. The method and the device are used for improving the voice service continuity of the terminal equipment.

Description

Communication method, communication device, electronic equipment and storage medium

Technical Field

The present disclosure relates to the field of information processing technologies, and in particular, to a communication method, a device, an electronic device, and a storage medium.

Background

In the related art, in the roaming scenario of the core network of the fifth generation mobile communication technology (5th Generation mobile communication technology,5G), since the interoperation interface between the home network and the roaming network is not opened, and the terminal device and the network device do not support the interoperation interface in the roaming scenario of the 5G core network, if the terminal device in a connected state moves from the 5G network of the home operator to the 5G network of the roaming operator, the terminal device needs to be disconnected from the 5G network of the home operator first, and then re-access to the roaming 5G network. In this way, the voice service of the terminal device is disconnected and dropped, so that the continuity of the voice service of the terminal device is not guaranteed, and the 5G roaming experience of the user is seriously affected.

Disclosure of Invention

The application provides a communication method, a device, electronic equipment and a storage medium, which solve the problem that in the prior art, the voice service continuity of terminal equipment cannot be ensured when the terminal equipment roams in a 5G core network.

In a first aspect, a communication method is provided, including: the terminal equipment sends a first measurement report to the first access network equipment; the terminal equipment is terminal equipment for carrying out voice service in a first cell, the first cell belongs to a first Public Land Mobile Network (PLMN), the first access network equipment is access network equipment currently accessed by the terminal equipment, and the first measurement report is used for indicating that the signal strength of the first cell and the signal strength of the second cell meet a connection state mobility event; the second cell belongs to a second PLMN network; the terminal equipment receives first indication information from first access network equipment, wherein the first indication information is used for indicating the terminal equipment to access a third cell; the third cell belongs to the first PLMN network; and responding to the first indication information, and accessing the third cell by the terminal equipment.

With reference to the first aspect, in one possible implementation manner, the method further includes: the terminal equipment receives second indication information from the first access network equipment; the second indication information is used for indicating the terminal equipment to measure the signal strength of at least one cell in the first PLMN network; the terminal equipment measures the signal intensity of at least one cell and determines the cell of which the signal intensity meets the first preset condition in the at least one cell as a third cell; the terminal equipment sends a second measurement report to the first access network equipment; the second measurement report is used to indicate a third cell.

With reference to the first aspect, in one possible implementation manner, the method further includes: the terminal equipment sends a third measurement report to the second access network equipment; the second access network device is the access network device corresponding to the third cell; the third measurement report is used for indicating a fourth cell, and the fourth cell is a cell in which the signal strength in the second PLMN network meets a second preset condition; the terminal equipment receives third indication information from the second access network equipment; the third indication information is used for indicating the terminal equipment to access the fourth cell; and responding to the third indication information, and accessing the terminal equipment into a fourth cell.

With reference to the first aspect, in one possible implementation manner, the first measurement report includes at least one of the following: the signal strength of the second cell is higher than that of the first cell; the signal strength of the first cell is lower than a first threshold value, and the signal strength of the second cell is higher than a second threshold value; the signal strength of the first cell is below a third threshold.

With reference to the first aspect, in one possible implementation manner, the third measurement report is a measurement report generated by at least one cell in the second PLMN network after the terminal device completes the voice service.

With reference to the first aspect, in one possible implementation manner, the second PLMN network is a PLMN network with no interoperable interface configured with the first PLMN network.

With reference to the first aspect, in one possible implementation manner, the first PLMN network is a home operator network of the terminal device; the second PLMN network is a roaming operator network of the terminal equipment.

With reference to the first aspect, in one possible implementation manner, the first cell is a fifth generation mobile communication technology 5G cell in a home operator network; the second cell is a 5G cell in the roaming operator network; the third cell is a fourth generation mobile communication technology 4G cell in the home operator network.

With reference to the first aspect, in one possible implementation manner, the fourth cell is a 5G cell of a roaming operator of the terminal device.

In a second aspect, a communication method is provided, including: the method comprises the steps that first access network equipment receives a first measurement report from terminal equipment; the terminal equipment is terminal equipment for carrying out voice service in a first cell, the first cell belongs to a first Public Land Mobile Network (PLMN), the first access network equipment is access network equipment currently accessed by the terminal equipment, and the first measurement report is used for indicating that the signal strength of the first cell and the signal strength of the second cell meet a connection state mobility event; the second cell belongs to a second PLMN network; the first access network equipment generates first indication information according to the first measurement report; the first indication information is used for indicating the terminal equipment to access the third cell; the third cell belongs to the first PLMN network; the first access network device sends first indication information to the terminal device.

With reference to the second aspect, in one possible implementation manner, the method further includes: the first access network equipment generates second indication information; the second indication information is used for indicating the terminal equipment to measure the signal strength of at least one cell in the first PLMN network; the first access network equipment sends second indication information to the terminal equipment; the first access network equipment receives a second measurement report from the terminal equipment; the second measurement report is used for indicating a third cell; and the first access network equipment generates first indication information according to the second measurement report.

With reference to the second aspect, in one possible implementation manner, the first measurement report includes at least one of the following: the signal strength of the second cell is higher than that of the first cell; the signal strength of the first cell is lower than a first threshold value, and the signal strength of the second cell is higher than a second threshold value; the signal strength of the first cell is below a third threshold.

With reference to the second aspect, in one possible implementation manner, the second PLMN network is a PLMN network with no interoperable interface configured with the first PLMN network.

With reference to the second aspect, in one possible implementation manner, the first PLMN network is a home operator network of the terminal device; the second PLMN network is a roaming operator network of the terminal equipment.

With reference to the second aspect, in one possible implementation manner, the first cell is a fifth generation 5G cell in a home operator network; the second cell is a 5G cell in the roaming operator network; the third cell is a fourth generation 4G cell in the home operator network.

In a third aspect, a communication method is provided, including: the second access network equipment receives a third measurement report from the terminal equipment; the third measurement report is used for indicating a fourth cell, and the fourth cell is a cell in which the signal strength in the second PLMN network meets a second preset condition; the second access network equipment generates third indication information according to the third measurement report; the third indication information is used for indicating the terminal equipment to access the fourth cell; the second access network device sends third indication information to the terminal device.

With reference to the third aspect, in one possible implementation manner, the third measurement report is a measurement report generated by at least one cell in the second PLMN network after the terminal device completes the voice service.

With reference to the third aspect, in one possible implementation manner, the second PLMN network is a roaming operator network of the terminal device.

With reference to the third aspect, in one possible implementation manner, the fourth cell is a 5G cell in a roaming operator network.

In a fourth aspect, there is provided a communication apparatus comprising: a processing unit and a communication unit; the processing unit is used for indicating the communication unit to send a first measurement report to the first access network equipment; the communication device is terminal equipment for performing voice service in a first cell, the first cell belongs to a first Public Land Mobile Network (PLMN), the first access network equipment is access network equipment currently accessed by the terminal equipment, and the first measurement report is used for indicating that the signal strength of the first cell and the signal strength of the second cell meet a connection state mobility event; the second cell belongs to a second PLMN network; the processing unit is further configured to instruct the communication unit to receive first indication information from the first access network device, where the first indication information is used to instruct the terminal device to access the third cell; the third cell belongs to the first PLMN network; and the processing unit is also used for responding to the first indication information and accessing the third cell.

With reference to the fourth aspect, in one possible implementation manner, the processing unit is specifically configured to: the communication unit is instructed to receive second instruction information from the first access network equipment; the second indication information is used for indicating the terminal equipment to measure the signal strength of at least one cell in the first PLMN network; measuring the signal intensity of at least one cell, and determining the cell of which the signal intensity meets the first preset condition in the at least one cell as a third cell; instructing the communication unit to send a second measurement report to the first access network device; the second measurement report is used to indicate a third cell.

With reference to the fourth aspect, in one possible implementation manner, the processing unit is specifically configured to: the communication unit is instructed to send a third measurement report to the second access network equipment; the second access network device is the access network device corresponding to the third cell; the third measurement report is used for indicating a fourth cell, and the fourth cell is a cell in which the signal strength in the second PLMN network meets a second preset condition; the indication communication unit receives third indication information from the second access network equipment; the third indication information is used for indicating the terminal equipment to access the fourth cell; and responding to the third indication information, and accessing a fourth cell.

With reference to the fourth aspect, in one possible implementation manner, the first measurement report includes at least one of the following: the signal strength of the second cell is higher than that of the first cell; the signal strength of the first cell is lower than a first threshold value, and the signal strength of the second cell is higher than a second threshold value; the signal strength of the first cell is below a third threshold.

With reference to the fourth aspect, in one possible implementation manner, the third measurement report is a measurement report generated by at least one cell in the second PLMN network after the terminal device completes the voice service.

With reference to the fourth aspect, in one possible implementation manner, the second PLMN network is a PLMN network with no interoperable interface configured with the first PLMN network.

With reference to the fourth aspect, in one possible implementation manner, the first PLMN network is a home operator network of the terminal device; the second PLMN network is a roaming operator network of the terminal equipment.

With reference to the fourth aspect, in one possible implementation manner, the first cell is a fifth generation mobile communication technology 5G cell in a home operator network; the second cell is a 5G cell in the roaming operator network; the third cell is a fourth generation mobile communication technology 4G cell in the home operator network.

With reference to the fourth aspect, in one possible implementation manner, the fourth cell is a 5G cell of a roaming operator of the terminal device.

In a fifth aspect, there is provided a communication apparatus comprising: a processing unit and a communication unit; a processing unit, configured to instruct the communication unit to receive a first measurement report from the terminal device; the terminal equipment is terminal equipment for carrying out voice service in a first cell, the first cell belongs to a first Public Land Mobile Network (PLMN) network, the communication device is first access network equipment which is accessed by the terminal equipment at present, and the first measurement report is used for indicating that the signal strength of the first cell and the signal strength of the second cell meet a connection state mobility event; the second cell belongs to a second PLMN network; the processing unit is further used for generating first indication information according to the first measurement report; the first indication information is used for indicating the terminal equipment to access the third cell; the third cell belongs to the first PLMN network; and the processing unit is used for indicating the communication unit to send the first indication information to the terminal equipment.

With reference to the fifth aspect, in one possible implementation manner, the processing unit is specifically configured to: generating second indication information; the second indication information is used for indicating the terminal equipment to measure the signal strength of at least one cell in the first PLMN network; the indication communication unit sends second indication information to the terminal equipment; instruct the communication unit to receive a second measurement report from the terminal device; the second measurement report is used for indicating a third cell; and generating first indication information according to the second measurement report.

With reference to the fifth aspect, in one possible implementation manner, the first measurement report includes at least one of the following: the signal strength of the second cell is higher than that of the first cell; the signal strength of the first cell is lower than a first threshold value, and the signal strength of the second cell is higher than a second threshold value; the signal strength of the first cell is below a third threshold.

With reference to the fifth aspect, in one possible implementation manner, the second PLMN network is a PLMN network with no interoperable interface configured with the first PLMN network.

With reference to the fifth aspect, in one possible implementation manner, the first PLMN network is a home operator network of the terminal device; the second PLMN network is a roaming operator network of the terminal equipment.

With reference to the fifth aspect, in one possible implementation manner, the first cell is a fifth generation 5G cell in a home operator network; the second cell is a 5G cell in the roaming operator network; the third cell is a fourth generation 4G cell in the home operator network.

In a sixth aspect, there is provided a communication apparatus comprising: a processing unit and a communication unit; a processing unit, configured to instruct the communication unit to receive a third measurement report from the terminal device; the third measurement report is used for indicating a fourth cell, and the fourth cell is a cell in which the signal strength in the second PLMN network meets a second preset condition; the communication device is a second access network device corresponding to the third cell; the third cell belongs to the first PLMN network; the processing unit is further used for generating third indication information according to the third measurement report; the third indication information is used for indicating the terminal equipment to access the fourth cell; and the processing unit is also used for indicating the communication unit to send third indication information to the terminal equipment.

With reference to the sixth aspect, in one possible implementation manner, the third measurement report is a measurement report generated by at least one cell in the second PLMN network after the terminal device completes the voice service.

With reference to the sixth aspect, in one possible implementation manner, the second PLMN network is a roaming operator network of the terminal device.

With reference to the sixth aspect, in one possible implementation manner, the fourth cell is a 5G cell in a roaming operator network.

In a seventh aspect, the present application provides an electronic device, including: a processor and a communication interface; the communication interface is coupled to a processor for running a computer program or instructions to implement the communication method as described in any one of the possible implementations of the first aspect and the first aspect.

In an eighth aspect, the present application provides an electronic device, including: a processor and a communication interface; the communication interface is coupled to a processor for running a computer program or instructions to implement the communication method as described in any one of the possible implementations of the second aspect and the second aspect.

In a ninth aspect, the present application provides an electronic device, including: a processor and a communication interface; the communication interface is coupled to a processor for running a computer program or instructions to implement the communication method as described in any one of the possible implementations of the third aspect and the third aspect.

In a tenth aspect, the present application provides a computer readable storage medium having instructions stored therein which, when executed by a processor of a communication device, enable the communication device to perform a communication method as described in any one of the possible implementations of the first aspect and the first aspect.

In an eleventh aspect, the present application provides a computer readable storage medium having instructions stored therein which, when executed by a processor of a communication device, enable the communication device to perform a communication method as described in any one of the possible implementations of the second aspect and the second aspect.

In a twelfth aspect, the present application provides a computer-readable storage medium having instructions stored therein that, when executed by a processor of a communication device, enable the communication device to perform a communication method as described in any one of the possible implementations of the third aspect and the third aspect.

In the present application, the names of the above-mentioned communication apparatuses do not constitute limitations on the devices or function modules themselves, and in actual implementations, these devices or function modules may appear under other names. Insofar as the function of each device or function module is similar to that of the present invention, it falls within the scope of the claims of the present invention and the equivalents thereof.

These and other aspects of the invention will be more readily apparent from the following description.

The technical scheme provided by the application at least brings the following beneficial effects: in case the terminal device accesses the first cell of the first PLMN network and performs voice traffic in the first cell, if the terminal device triggers a connection state mobility event, the access network device does not instruct the terminal device to access the second cell of the second PLMN but instructs the terminal device to access the third cell of the first PLMN network.

Since there is currently an inter-operation interface commonly opened between different networks under the same PLMN network, according to which the terminal device can be switched or redirected into a cell of the same PLMN network without affecting the voice service continuity of the terminal device. Therefore, in the technical scheme provided by the application, the access network equipment can instruct the terminal equipment to switch to the cell of the same PLMN network to continue the voice service under the condition that the terminal equipment performs the voice service and triggers the mobility event, so that the voice service interruption caused by the fact that the terminal equipment is switched to the cell of different PLMN networks is avoided. Therefore, the communication method provided by the application can improve the voice service continuity of the terminal equipment, and further improve the network experience of the user.

Drawings

Fig. 1 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 2 is a schematic mobility diagram of a terminal device in roaming of a 5G core network according to an embodiment of the present application;

fig. 3 is a schematic connection diagram of a home network and a roaming network in a roaming scenario of a 5G core network provided in an embodiment of the present application;

fig. 4 is a schematic flow chart of a communication method according to an embodiment of the present application;

fig. 5 is a flow chart of another communication method according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of another communication device according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of another communication device according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of another communication device according to an embodiment of the present application.

Detailed Description

The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone.

The terms "first" and "second" and the like in the description and in the drawings are used for distinguishing between different objects or for distinguishing between different processes of the same object and not for describing a particular sequential order of objects.

Furthermore, references to the terms "comprising" and "having" and any variations thereof in the description of the present application are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed but may optionally include other steps or elements not listed or inherent to such process, method, article, or apparatus.

It should be noted that, in the embodiments of the present application, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

In the description of the present application, unless otherwise indicated, the meaning of "a plurality" means two or more.

In order to implement the communication method provided by the embodiment of the present application, the embodiment of the present application provides a communication device for executing the communication method, and fig. 1 is a schematic structural diagram of the communication device provided by the embodiment of the present application. As shown in fig. 1, the communication device 100 includes at least one processor 101, a communication line 102, and at least one communication interface 104, and may also include a memory 103. The processor 101, the memory 103, and the communication interface 104 may be connected through a communication line 102.

The processor 101 may be a central processing unit (central processing unit, CPU), an application specific integrated circuit (application specific integrated circuit, ASIC), or one or more integrated circuits configured to implement embodiments of the present application, such as: one or more digital signal processors (digital signal processor, DSP), or one or more field programmable gate arrays (field programmable gate array, FPGA).

Communication line 102 may include a pathway for communicating information between the aforementioned components.

The communication interface 104, for communicating with other devices or communication networks, may use any transceiver-like device, such as ethernet, radio access network (radio access network, RAN), wireless local area network (wireless local area networks, WLAN), etc.

The memory 103 may be, but is not limited to, a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (random access memory, RAM) or other type of dynamic storage device that can store information and instructions, or an electrically erasable programmable read-only memory (electrically erasable programmable read-only memory, EEPROM), a compact disc read-only memory (compact disc read-only memory) or other optical disc storage, optical disc storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to include or store desired program code in the form of instructions or data structures and that can be accessed by a computer.

In a possible design, the memory 103 may exist independent of the processor 101, i.e. the memory 103 may be a memory external to the processor 101, where the memory 103 may be connected to the processor 101 through a communication line 102 for storing execution instructions or application program codes, and the execution is controlled by the processor 101 to implement a communication method provided in the embodiments described below. In yet another possible design, the memory 103 may be integrated with the processor 101, i.e., the memory 103 may be an internal memory of the processor 101, e.g., the memory 103 may be a cache, and may be used to temporarily store some data and instruction information, etc.

As one implementation, processor 101 may include one or more CPUs, such as CPU0 and CPU1 in fig. 1. As another implementation, the communication device 100 may include multiple processors, such as the processor 101 and the processor 107 in fig. 1. As yet another implementation, the communication apparatus 100 may further include an output device 105 and an input device 106.

The following explains the terms related to the embodiments of the present application, so as to facilitate the understanding of the reader.

1. 5G foreign network roaming

The 5G heterogeneous network roaming refers to a roaming method that terminal equipment belonging to an operator A accesses to a 5G network of an operator B, and the operator B provides 5G network service for the terminal equipment.

5G foreign network roaming is typically used in a scenario where a certain area is already covered by the 5G network of the inner operator B, but not by the 5G network of operator B. The networking mode based on 5G heterogeneous network roaming can accelerate 5G infrastructure at present, reduce 5G network repeated construction, and realize 5G network coverage and service development intensively and efficiently.

Currently, 5G foreign network roaming includes both 5G core network roaming and 5G access network roaming. The present application relates generally to 5G core network roaming, and the following describes a specific implementation manner of 5G core network roaming.

2. 5G core network roaming

5G core network roaming refers to that in a certain network coverage area, if a certain operator (e.g. operator B) builds a 5G network (including the construction of an access network and a core network) in the area, terminal devices belonging to other operators (operator A) can also access the 5G network built by the operator B in a roaming mode, and the 5G network of the operator B provides 5G network services for the terminal devices belonging to the operator A. In this case, for the terminal device, operator B is denoted as a roaming operator, operator a is denoted as a home operator, and the network coverage area is denoted as a roaming area.

In 5G core network roaming, 5G core network roaming is divided into the following two scenarios based on whether the home operator has a wireless signal in the roaming area.

Scenario 1, home operator no wireless network signal in roaming area, roaming operator has fourth generation mobile communication technology (4th Generation mobile communication technology,4G) or 5G signal in roaming area, terminal equipment only uses 5G network of roaming network.

Specifically, a walk-out scene and a walk-back scene are included in the scene 1. Hereinafter, description will be made of each of:

and (3) a scene is diffused: when the terminal equipment enters a roaming area, the terminal equipment preferentially uses the 5G network of the roaming operator to provide roaming service of the 5G network for the terminal equipment; the roaming operator does not provide the terminal device with roaming services of the 4G network. In this scenario, the roaming operator does not support the fallback of the voice traffic of the terminal device to the 4G network of the roaming operator.

Diffuse back scene: the user's terminal device leaves the roaming area and searches for a home operator network signal (either a 4G network signal or a 5G network signal). The terminal equipment returns to the home operator network, and the home operator provides network service for the terminal equipment. In this scenario, the terminal device may normally perform the voice service fallback.

In the roaming scenario of scenario 1, since the home operator network does not have any network signals within the roaming area, the default home operator's terminal device in scenario 1 only performs traffic in the 5G network of the roaming network after roaming to the shared area. In this scenario, the roaming operator will not need to support the service continuity of the terminal device.

However, in the roaming scenario of scenario 1, when the terminal device moves from the home operator network (hereinafter referred to as home network) to the roaming operator network (hereinafter referred to as roaming network), it is necessary to take a long time for the terminal device to get off the network and re-search to re-access the roaming network after the terminal device is disconnected from the home network. This may result in a longer interruption of the ongoing service for the user and a poorer user experience.

Scene 2, home operator has 4G network signal in roaming area without 5G network signal, roaming operator has 4G or 5G network in roaming area. The terminal equipment preferentially uses the 5G network of the roaming operator in the roaming area, and uses the 4G network of the home operator when the 5G network of the roaming operator is not covered enough.

Scene 2 includes a diffuse scene and a diffuse return scene as well, and will be described below.

And (3) a scene is diffused: when the terminal equipment of the user enters the roaming area, the terminal equipment preferentially uses the 5G network of the roaming operator to provide the roaming service of the 5G network for the terminal equipment. When the 5G network of the roaming operator is not covered sufficiently, the terminal equipment uses the 4G network of the home operator.

Diffuse back scene: the user's terminal device leaves the roaming area and searches for a home operator network signal (either a 4G network signal or a 5G network signal). The terminal equipment returns to the home operator network, and the home operator provides network service for the terminal equipment.

The method of service continuity in scenario 2 has not been discussed at present, and no service standard and device support service continuity in scenario 2 is currently available. Therefore, how to improve the continuity of the service in the service 5G heterogeneous network roaming scenario becomes a technical problem that needs to be solved currently.

In the embodiment of the application, the method is mainly used for solving the problem of voice service continuity in the scene 2 in the roaming of the 5G core network.

Fig. 2 is a schematic mobility diagram of a terminal device in roaming of a 5G core network according to an embodiment of the present application. In scenario 2, there are an area 1 and an area 2, wherein the 5G network of the home operator covers an area 1, the 5G network of the roaming operator covers an area 2 (area 2 is also called roaming area), and the 4G network of the home operator covers both the above area 1 and the above area 2.

When the terminal device moves between the area 1 and the area 2 as shown in fig. 2, the movement situation of the terminal device includes at least the following cases 1 to 4.

Case 1, terminal device moves from home operator's 4G network to roaming operator's 5G network.

Case 2, terminal device moves from roaming operator's 5G network to home operator's 4G network.

Case 3, terminal device moves from home operator's 5G network to roaming operator's 5G network.

Case 4, terminal device moves from roaming operator's 5G network to home operator's 5G network.

Fig. 3 is a schematic connection diagram of a home network and a roaming network in a roaming scenario of a 5G core network according to an embodiment of the present application.

Among the home networks are home operator 5G core networks, home operator 4G core networks, home operator internet protocol (internet protocol, IP) multimedia system (IP multimedia subsystem, IMS) networks, home operator 5G access networks, and home operator 4G access networks.

The roaming network comprises a roaming operator 5G core network and a roaming operator 5G access network.

In the 5G core network roaming scene, after the terminal equipment moves from the home network to the roaming network, the data generated by the terminal equipment in the roaming network is returned to the home network in a home routing mode, and the home network processes the service data generated by the terminal equipment. The signaling plane of the home network's core network (including home operator 5G core network (5G core,5 GC) and home operator 4G core network packet core network (evolved packet core, EPC) and roaming network core network (including roaming operator 5 GC) are connected through a secure edge protection proxy (security edge protection proxies, see).

The signaling interface between the home network and the roaming network comprises a roaming interface and an interoperation interface, the interoperation interface is not defined in the current international standard and industry standard, and the current terminal equipment and network equipment also do not support the interoperation interface in the roaming scene of the 5G core network.

Because the interoperation interface between the home network and the roaming network is not opened currently, and the terminal device and the network device do not support the interoperation interface in the roaming scenario of the 5G core network, if the terminal device in a connected state moves from the 5G network of the home operator to the 5G network of the roaming operator, the terminal device needs to be disconnected from the 5G network of the home operator first, and then re-accesses the roaming 5G network. In this way, the voice service of the terminal device is disconnected and dropped, so that the continuity of the voice service of the terminal device is not guaranteed, and the 5G roaming experience of the user is seriously affected.

In order to solve the problem that in the prior art, when a terminal device in a connection state moves from a 5G network of a home operator to a 5G network of a roaming operator, the continuity of voice service of the terminal device is not guaranteed, the embodiment of the application provides a communication method, which is used for enabling the terminal device to complete the voice service in the home operator network when the terminal device performs the voice service from the 5G network of the home operator and triggers mobility management of the mobile terminal device to the roaming 5G network. Thus, the voice service of the terminal equipment is always carried out in the home operator network, the continuity of the voice service is not affected by the mobility of the terminal equipment and the call is dropped, the continuity of the voice service is greatly improved, and the network experience of a user is improved.

As shown in fig. 4, a communication method according to an embodiment of the present application includes the following S401 to S404.

S401, the terminal equipment sends a first measurement report to the first access network equipment. Correspondingly, the first access network device receives a first measurement report from the terminal device.

The terminal equipment is terminal equipment for carrying out voice service in a first cell, the first cell belongs to a first public land mobile network (public land mobile network, PLMN) network, the first access network equipment is access network equipment which is accessed by the terminal equipment at present, and the first measurement report is used for indicating that the signal strength of the first cell and the signal strength of the second cell meet a connection state mobility event; the second cell is assigned to a second PLMN network.

Optionally, the first PLMN network is a home operator network of the terminal device; the second PLMN network is a roaming operator network of the terminal equipment; the second PLMN network is a PLMN network with no interoperable interface configured with the first PLMN network. The first cell is a 5G cell in the home network. The second cell is a 5G cell in the roaming network.

Accordingly, S401 may be specifically implemented by the following procedure: the terminal device is performing a voice call service through the 5G cell of the home operator. In the call process, the terminal equipment continuously measures the signal intensity of the current service cell (first cell) and the adjacent cell thereof, and when the terminal equipment detects that the signal intensity of the first cell and the signal intensity of the second cell meet the mobility event of the terminal equipment in a connection state, the terminal equipment generates a first measurement report. The terminal device sends a first measurement report to the first access network device. Correspondingly, the first access network device receives a first measurement report from the terminal device.

In a possible implementation, the first measurement report includes at least one of:

a) The signal strength of the second cell is higher than the signal strength of the first cell. I.e. the signal strength of the 5G cell in the roaming network is higher than the current serving cell.

b) The signal strength of the first cell is lower than a first threshold value and the signal strength of the second cell is higher than a second threshold value. That is, the signal strength of the current serving cell is below a first threshold and the signal strength of the 5G cell in the roaming network is above a second threshold.

c) The signal strength of the first cell is below a third threshold. I.e. the signal strength of the current serving cell is below the third threshold value.

It should be noted that, the mobility event in the connection state described in the embodiments of the present application includes a handover event and a redirection event of the terminal device in the connection state.

S402, the first access network equipment generates first indication information according to the first measurement report.

The first indication information is used for indicating the terminal equipment to access the third cell; the third cell belongs to the first PLMN network.

Optionally, the third cell is a 4G cell in the home network. That is, the first indication information is used to instruct the terminal device to access the 4G cell in the home network.

In a possible implementation manner, the manner in which the terminal device is indicated to access the third cell by the first indication information is different according to the mobility event triggered by the first measurement report.

For example, in case the mobility event triggered by the first measurement report is a handover event, the first indication information is used to instruct the terminal device to handover into a 4G cell (i.e. a third cell) in the home network.

In case of a first measurement report triggered mobility event being a redirection event, the first indication information is used to instruct the terminal device to redirect into a 4G cell in the home network.

In the embodiment of the present application, a description will be given mainly taking a first cell as a 5G cell in a home network, a second cell as a 5G cell in a roaming network, and a third cell as a 4G cell in the home network as an example.

S403, the first access network equipment sends first indication information to the terminal equipment. Correspondingly, the terminal equipment receives first indication information from the first access network equipment.

S404, responding to the first indication information, and accessing the third cell by the terminal equipment.

In a possible implementation manner, according to the difference in the manner of accessing the terminal device to the 4G cell in the home network indicated by the first indication information, the action flow of accessing the terminal device to the 4G cell in the home network is different.

For example, in case the first indication information is used to instruct the terminal device to handover to a 4G cell in the home network, the terminal device performs a corresponding handover procedure to handover to the 4G cell in the home network.

In case the first indication information is used to indicate the terminal device to redirect to a 4G cell in the home network, the terminal device performs a corresponding redirection procedure to redirect to the 4G cell in the home network.

It should be noted that, after the terminal device accesses to the third cell, the voice service is continuously performed on the third cell, so as to ensure the continuity of the voice service of the terminal device.

Note that, the voice service described in the embodiment of the present application includes a voice call service, a data call service, a video call service, and the like, which is not limited in this application.

The above embodiment brings at least the following advantages: in case the terminal device accesses the first cell of the first PLMN network and performs voice traffic in the first cell, if the terminal device triggers a connection state mobility event, the access network device does not instruct the terminal device to access the second cell of the second PLMN but instructs the terminal device to access the third cell of the first PLMN network.

In the foregoing, the general description of the communication method provided in the embodiments of the present application should be pointed out that, before the access network device generates the first indication information, the access network device generally needs to instruct the terminal device to measure the signal strength of the cell under the first PLMN network to determine the third cell. This process is explained below.

Referring to fig. 4, as shown in fig. 5, after S401 and before S402, the communication method provided in the embodiment of the present application further includes the following S501-S505:

S501, the first access network equipment generates second indication information.

The second indication information is used to instruct the terminal device to measure the signal strength of at least one cell in the first PLMN network.

Specifically, after the first access network device receives the first measurement report from the terminal device, the first access network device makes the following determination: the first access network equipment needs to judge whether the terminal equipment is carrying out voice service or not; the first access network device determines whether the first measurement report is used to trigger the terminal device to switch to a cell of a different PLMN network, and if so, the first access network device further determines whether an inter-operational interface (typically an N14 interface) across PLMNs is not configured between the first PLMN network and the second PLMN network (e.g., between an access and mobility management function (access and mobility management function, AMF) of the first PLMN and an AMF of the second PLMN).

If the first access network device determines that the terminal device is performing voice service, the first measurement report is used for triggering the terminal device to switch to cells of different PLMN networks, and an inter-PLMN-crossing interoperable interface is not configured between the first PLMN network and the second PLMN network, the first access network device generates second indication information.

In a possible implementation manner, the second indication information includes at least one of frequency point information and cell identification of the cell to be measured.

Optionally, at least one cell indicated by the second indication information is a cell with a different network system from the first cell. Or at least one cell indicated by the second indication information is a cell with the same network system as the first cell.

The present application mainly describes an example in which at least one cell indicated by the second indication information is a cell having a different network system from the first cell.

For example, in the case that the first cell is a 5G cell in the first PLMN network, at least one cell indicated by the second indication information is a 4G cell in the first PLMN network.

S502, the first access network equipment sends second indication information to the terminal equipment. Correspondingly, the terminal equipment receives second indication information from the first access network equipment.

S503, the terminal equipment measures the signal intensity of at least one cell, and determines the cell of which the signal intensity meets the first preset condition in the at least one cell as a third cell.

Specifically, after receiving the second instruction information, the terminal device determines cell information (for example, frequency point information of a cell, identity of a cell, etc.) of at least one cell indicated by the second instruction information. The terminal device starts measurement according to the cell information of at least one cell, and determines the signal intensity of each cell in the at least one cell. The terminal equipment selects a cell meeting a first preset condition from at least one cell as a third cell according to the signal intensity of each cell in the at least one cell.

In a possible implementation manner, the first preset condition is: the signal strength is greater than the fourth threshold value. Or the first preset condition is: the signal cell is largest. In addition, the first preset condition may be other conditions, which is not limited in the present application.

S504, the terminal equipment generates a second measurement report.

Wherein the second measurement report is used to indicate the third cell.

Specifically, after determining the third cell, the terminal device sends the cell identifier of the third cell to the first access network device, along with the cell identifier in the second measurement report. In addition, the second measurement report may further include information such as signal strength of the third cell.

It should be noted that in S503 and S504, the terminal device measures at least one cell signal strength to determine the third cell, and reports the third cell to the first access network device is mainly described as an example. In the actual implementation process, after the terminal device measures the signal strength of at least one cell, the signal strength of each cell may also be carried in a second measurement report and sent to the first access network device, and the first access network device selects a third cell according to the signal strength of at least one cell.

S505, the terminal equipment sends a second measurement report to the first access network equipment. Correspondingly, the first access network device receives the second measurement report from the terminal device.

Accordingly, S402 may be implemented by the following S506.

S506, the first access network equipment generates first indication information according to the second measurement report.

In a possible implementation manner, after the first access network device receives the second measurement report, a third cell indicated by the second measurement report is determined. The first access network device writes the cell identifier of the third cell (or may be other information that can be used to characterize the third cell, which is not limited in this application) into a message sent to the terminal device, so as to generate first indication information.

The scheme at least brings the following beneficial effects: before the first access network device instructs the terminal device to access the third cell, the first access network device instructs the terminal device to measure the signal intensity of the cell of the type (for example, the 4G cell in the first PLMN network), and selects the cell with the signal intensity meeting the requirement as the third cell, so that the terminal device can be ensured to be switched into the cell with the signal intensity meeting the requirement, and the call quality of the terminal device is ensured.

The method for ensuring the continuity of the voice service includes that when the first access network device triggers the mobility event of different PLMN networks when the terminal device performs the voice service, the terminal device is firstly instructed to switch to a third cell under the same PLMN.

After the terminal device completes the voice service on the third cell, the second access network device may further instruct the terminal device to measure the signal strength of the cell under the second PLMN again, and instruct the terminal device to access to the cell under the second PLMN when the signal strength of the cell of the second PLMN meets a preset condition. The following describes the process in detail:

in a possible implementation manner, as shown in fig. 5, after S404, the communication method provided in the embodiment of the present application further includes the following S507-S510:

s507, the terminal equipment sends a third measurement report to the second access network equipment. Correspondingly, the second access network device receives a third measurement report from the terminal device.

The second access network device is the access network device corresponding to the third cell; the third measurement report is used for indicating a fourth cell, and the fourth cell is a cell in which the signal strength in the second PLMN network meets a second preset condition.

In a possible implementation manner, the second preset condition is: the signal strength is greater than a fifth threshold. Or the second preset condition is: the signal cell is largest. In addition, the second preset condition may be other conditions, which is not limited in the present application.

Optionally, the third measurement report is a measurement report generated by at least one cell in the second PLMN network after the terminal device completes the voice service.

Optionally, the at least one cell in the second PLMN network is at least one 5G cell in the second PLMN network.

Next, taking the third cell as a 4G cell in the home network and the fourth cell as a 5G cell in the roaming network as an example, S507 will be specifically described: and the terminal equipment continues to carry out voice service through the second access network equipment, after the second access network equipment determines that the terminal equipment completes the voice service, the second access network equipment determines that the terminal equipment supports to quickly return to the 5G cell, and then the second access network equipment determines the information of the 5G cell needing to be measured and instructs the terminal equipment to measure the signal strength of the 5G cell. The terminal equipment measures the signal intensity of the 5G cells and generates a third measurement report according to the cells of which the signal intensity of the 5G cells meets a third preset condition. And the terminal equipment sends a third measurement report to the second access network equipment. Correspondingly, the second access network device receives a third measurement report from the terminal device.

It should be noted that the second access network device is an access network device corresponding to the third cell, and that the terminal device accesses the third cell may also be understood as the terminal device accessing the second access network device.

And S508, the second access network equipment generates third indication information according to the third measurement report. The third indication information is used for indicating the terminal equipment to access the fourth cell.

The third indication information is used to instruct the terminal device to handover to a 5G cell in the roaming network, similar to the first indication information.

Alternatively, the first indication information is used to indicate that the terminal device is redirected to a 5G cell in the roaming network.

S509, the second access network sends third indication information to the terminal equipment. Correspondingly, the terminal equipment receives third indication information from the second access network equipment.

And S510, responding to the third indication information, and accessing the terminal equipment into a fourth cell.

Similar to the terminal device accessing the third cell, in the case that the third indication information is used to instruct the terminal device to switch to the 5G cell of the roaming network, the terminal device performs a corresponding switching procedure to switch to the 5G cell of the roaming network.

And under the condition that the third indication information is used for indicating the terminal equipment to redirect to the 5G cell of the roaming network, the terminal equipment executes a corresponding redirection flow to redirect to the 5G cell of the roaming network.

The scheme at least brings the following beneficial effects: after the terminal device completes the voice service, the second access network device instructs the terminal device to measure the signal strength of the 5G cell in the second PLMN network again. And when the signal strength of the 5G cell in the second PLMN network meets the preset condition, the second access network equipment instructs the terminal equipment to switch or redirect to the 5G cell in the second PLMN network. Therefore, under the condition that the voice service continuity of the terminal equipment is not affected, the terminal equipment is preferentially switched into the 5G cell of the roaming network, and the roaming network provides 5G network service for the terminal equipment, so that the network experience of the user can be further improved.

It should be noted that the above description mainly takes the case that the terminal device is still in the roaming area after the terminal device finishes the voice service, and the terminal device accesses to the 5G cell of the roaming network preferentially. The second access network device may also instruct the terminal device to measure and access the 5G cell in the home network if the terminal device has left the roaming area and entered into the area covered by the 5G network of the home operator after the terminal device has ended the voice service. The procedure is similar to the procedure described above in which the second access network device instructs the terminal device to measure and access the 5G cell in the roaming network, which is not described in detail in this application.

It can be seen that the above technical solutions provided in the embodiments of the present application are mainly described from the method perspective. To achieve the above functions, it includes corresponding hardware structures and/or software modules that perform the respective functions. Those of skill in the art will readily appreciate that the various illustrative modules and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The embodiment of the present application may divide the functional modules of the communication device according to the above method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated modules may be implemented in hardware or in software functional modules. Optionally, the division of the modules in the embodiments of the present application is schematic, which is merely a logic function division, and other division manners may be actually implemented.

Fig. 6 is a schematic structural diagram of a communication device according to an embodiment of the present application. The communication device includes: a communication unit 601 and a processing unit 602.

A processing unit 602, configured to instruct the communication unit 601 to send a first measurement report to a first access network device; the communication device is terminal equipment for performing voice service in a first cell, the first cell belongs to a first Public Land Mobile Network (PLMN), the first access network equipment is access network equipment currently accessed by the terminal equipment, and the first measurement report is used for indicating that the signal strength of the first cell and the signal strength of the second cell meet a connection state mobility event; the second cell belongs to a second PLMN network; the processing unit 602 is further configured to instruct the communication unit 601 to receive first indication information from the first access network device, where the first indication information is used to instruct the terminal device to access the third cell; the third cell belongs to the first PLMN network; the processing unit 602 is further configured to access a third cell in response to the first indication information.

Optionally, the processing unit 602 is specifically configured to: the indication communication unit 601 receives second indication information from the first access network device; the second indication information is used for indicating the terminal equipment to measure the signal strength of at least one cell in the first PLMN network; measuring the signal intensity of at least one cell, and determining the cell of which the signal intensity meets the first preset condition in the at least one cell as a third cell; instruct the communication unit 601 to send a second measurement report to the first access network device; the second measurement report is used to indicate a third cell.

Optionally, the processing unit 602 is specifically configured to: instruct the communication unit 601 to send a third measurement report to the second access network device; the second access network device is the access network device corresponding to the third cell; the third measurement report is used for indicating a fourth cell, and the fourth cell is a cell in which the signal strength in the second PLMN network meets a second preset condition; the indication communication unit 601 receives third indication information from the second access network device; the third indication information is used for indicating the terminal equipment to access the fourth cell; and responding to the third indication information, and accessing a fourth cell.

Optionally, the first measurement report includes at least one of: the signal strength of the second cell is higher than that of the first cell; the signal strength of the first cell is lower than a first threshold value, and the signal strength of the second cell is higher than a second threshold value; the signal strength of the first cell is below a third threshold.

Optionally, the second PLMN network is a PLMN network with no interoperable interface configured with the first PLMN network.

Optionally, the first PLMN network is a home operator network of the terminal device; the second PLMN network is a roaming operator network of the terminal equipment.

Optionally, the first cell is a fifth generation mobile communication technology 5G cell in the home operator network; the second cell is a 5G cell in the roaming operator network; the third cell is a fourth generation mobile communication technology 4G cell in the home operator network.

Optionally, the fourth cell is a 5G cell of a roaming operator of the terminal device.

Fig. 7 is a schematic structural diagram of a communication device according to an embodiment of the present application. The communication device includes: a communication unit 701 and a processing unit 702.

A processing unit 702, configured to instruct the communication unit 701 to receive a first measurement report from a terminal device; the terminal equipment is terminal equipment for carrying out voice service in a first cell, the first cell belongs to a first Public Land Mobile Network (PLMN) network, the communication device is first access network equipment which is accessed by the terminal equipment at present, and the first measurement report is used for indicating that the signal strength of the first cell and the signal strength of the second cell meet a connection state mobility event; the second cell belongs to a second PLMN network; the processing unit 702 is further configured to generate first indication information according to the first measurement report; the first indication information is used for indicating the terminal equipment to access the third cell; the third cell belongs to the first PLMN network; a processing unit 702, configured to instruct the communication unit 701 to send the first instruction information to the terminal device.

Optionally, the processing unit 702 is specifically configured to: generating second indication information; the second indication information is used for indicating the terminal equipment to measure the signal strength of at least one cell in the first PLMN network; the instruction communication unit 701 transmits second instruction information to the terminal device; instruct the communication unit 701 to receive a second measurement report from the terminal device; the second measurement report is used for indicating a third cell; and generating first indication information according to the second measurement report.

Optionally, the first cell is a fifth generation 5G cell in the home operator network; the second cell is a 5G cell in the roaming operator network; the third cell is a fourth generation 4G cell in the home operator network.

Fig. 8 is a schematic structural diagram of a communication device according to an embodiment of the present application. The communication device includes: a communication unit 801 and a processing unit 802.

A processing unit 802, configured to instruct the communication unit 801 to receive a third measurement report from the terminal device; the third measurement report is used for indicating a fourth cell, and the fourth cell is a cell in which the signal strength in the second PLMN network meets a second preset condition; the communication device is a second access network device corresponding to the third cell; the third cell belongs to the first PLMN network; the processing unit 802 is further configured to generate third indication information according to a third measurement report; the third indication information is used for indicating the terminal equipment to access the fourth cell; the processing unit 802 is further configured to instruct the communication unit 801 to send third instruction information to the terminal device.

Optionally, the second PLMN network is a roaming operator network of the terminal equipment.

Optionally, the fourth cell is a 5G cell in a roaming operator network.

Optionally, the communication device may further comprise a storage module for storing program codes and/or data of the communication device.

Wherein the processing unit (e.g., processing unit 602, processing unit 702, processing unit 802) may be a processor or controller. Which may implement or perform the various exemplary logic blocks, modules, and circuits described in connection with this disclosure. A processor may also be a combination of computing functions, including for example, one or more microprocessor combinations, a combination of DSPs and microprocessors, and the like. The communication units (communication unit 601, communication unit 701, communication unit 801) may be a transceiver circuit, a communication interface, or the like. The memory module may be a memory. When the processing unit is a processor, the communication unit is a communication interface, and the storage module is a memory, the communication device according to the embodiment of the present application may be a communication device shown in fig. 1.

From the foregoing description of the embodiments, it will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of functional modules is illustrated, and in practical application, the above-described functional allocation may be implemented by different functional modules according to needs, i.e. the internal structure of the network node is divided into different functional modules to implement all or part of the functions described above. The specific working processes of the above-described system, module and network node may refer to the corresponding processes in the foregoing method embodiments, which are not described herein.

The embodiment of the application further provides a computer readable storage medium, in which instructions are stored, and when the computer executes the instructions, the computer executes each step in the method flow shown in the method embodiment.

The embodiment of the application also provides a chip, which comprises a processor and a communication interface, wherein the communication interface is coupled with the processor, and the processor is used for running a computer program or instructions to realize the communication method in the embodiment of the method.

Embodiments of the present application provide a computer program product comprising instructions which, when run on a computer, cause the computer to perform the communication method of the method embodiments described above.

The computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: electrical connections having one or more wires, portable computer diskette, hard disk. Random access Memory (Random Access Memory, RAM), read-Only Memory (ROM), erasable programmable Read-Only Memory (Erasable Programmable Read Only Memory, EPROM), registers, hard disk, optical fiber, portable compact disc Read-Only Memory (CD-ROM), an optical storage device, a magnetic storage device, or any other form of computer-readable storage medium suitable for use by a person or persons of skill in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an application specific integrated circuit (Application Specific Integrated Circuit, ASIC). In embodiments of the present invention, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.

Since the apparatus, device, computer readable storage medium, and computer program product in the embodiments of the present invention may be applied to the above-mentioned method, the technical effects that can be obtained by the apparatus, device, computer readable storage medium, and computer program product may also refer to the above-mentioned method embodiments, and the embodiments of the present invention are not repeated herein.

The foregoing is merely a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of communication, comprising:

the terminal equipment sends a first measurement report to the first access network equipment; the terminal equipment is terminal equipment for performing voice service in a first cell, the first cell belongs to a first Public Land Mobile Network (PLMN), the first access network equipment is access network equipment currently accessed by the terminal equipment, and the first measurement report is used for indicating that the signal strength of the first cell and the second cell meets a connection state mobility event; the second cell belongs to a second PLMN network;

The terminal equipment receives first indication information from the first access network equipment, wherein the first indication information is used for indicating the terminal equipment to access a third cell; the third cell belongs to the first PLMN network;

and responding to the first indication information, and accessing the third cell by the terminal equipment.

2. The method of claim 1, wherein prior to the terminal device receiving the first indication information from the first access network device, the method further comprises:

the terminal equipment receives second indication information from the first access network equipment; the second indication information is used for indicating the terminal equipment to measure the signal strength of at least one cell in the first PLMN network;

the terminal equipment measures the signal intensity of the at least one cell and determines a cell of the at least one cell, the signal intensity of which meets a first preset condition, as the third cell;

the terminal equipment sends a second measurement report to the first access network equipment; the second measurement report is used to indicate the third cell.

3. The method according to claim 1 or 2, characterized in that after the terminal device has accessed the third cell, the method further comprises:

The terminal equipment sends a third measurement report to the second access network equipment; the second access network device is an access network device corresponding to the third cell; the third measurement report is used for indicating a fourth cell, and the fourth cell is a cell in which the signal strength in the second PLMN network meets a second preset condition;

the terminal equipment receives third indication information from the second access network equipment; the third indication information is used for indicating the terminal equipment to access the fourth cell;

and responding to the third indication information, and accessing the fourth cell by the terminal equipment.

4. The method according to claim 1 or 2, wherein the first measurement report comprises at least one of:

the signal intensity of the second cell is higher than that of the first cell;

the signal strength of the first cell is lower than a first threshold value, and the signal strength of the second cell is higher than a second threshold value;

the signal strength of the first cell is lower than a third threshold value.

5. A method according to claim 3, characterized in that the third measurement report is a measurement report generated by at least one cell in the second PLMN network after the terminal device has completed the voice service.

6. The method according to claim 1 or 2, wherein the second PLMN network is a PLMN network with no interoperable interface configured with the first PLMN network.

7. The method according to claim 1 or 2, characterized in that the first PLMN network is a home operator network of the terminal equipment;

the second PLMN network is a roaming operator network of the terminal equipment.

8. The method of claim 7, wherein the first cell is a fifth generation mobile communication technology 5G cell in the home operator network;

the second cell is a 5G cell in the roaming operator network;

the third cell is a fourth generation mobile communication technology 4G cell in the home operator network.

9. A method according to claim 3, characterized in that the fourth cell is a 5G cell of a roaming operator of the terminal device.

10. A method of communication, comprising:

the method comprises the steps that first access network equipment receives a first measurement report from terminal equipment; the terminal equipment is terminal equipment for performing voice service in a first cell, the first cell belongs to a first Public Land Mobile Network (PLMN), the first access network equipment is access network equipment currently accessed by the terminal equipment, and the first measurement report is used for indicating that the signal strength of the first cell and the second cell meets a connection state mobility event; the second cell belongs to a second PLMN network;

The first access network equipment generates first indication information according to the first measurement report; the first indication information is used for indicating the terminal equipment to access a third cell; the third cell belongs to the first PLMN network;

and the first access network equipment sends first indication information to the terminal equipment.

11. The method of claim 10, wherein before the first access network device sends the first indication information to the terminal device, the method further comprises:

the first access network equipment generates second indication information; the second indication information is used for indicating the terminal equipment to measure the signal strength of at least one cell in the first PLMN network;

the first access network equipment sends the second indication information to the terminal equipment;

the first access network equipment receives a second measurement report from the terminal equipment; the second measurement report is used for indicating the third cell;

and the first access network equipment generates the first indication information according to the second measurement report.

12. The method according to claim 10 or 11, wherein the first measurement report comprises at least one of:

The signal intensity of the second cell is higher than that of the first cell;

the signal strength of the first cell is lower than a third threshold value.

13. The method according to claim 10 or 11, wherein the second PLMN network is a PLMN network with no interoperable interface configured with the first PLMN network.

14. The method according to claim 10 or 11, characterized in that the first PLMN network is a home operator network of the terminal equipment;

15. The method of claim 14, wherein the first cell is a fifth generation 5G cell in the home operator network;

the second cell is a 5G cell in the roaming operator network;

the third cell is a fourth generation 4G cell in the home operator network.

16. A method of communication, comprising:

the second access network equipment receives a third measurement report from the terminal equipment; the second access network device is an access network device corresponding to a third cell in the first PLMN network, and the terminal device is a terminal device which moves from the first cell to the third cell in the first PLMN and is in voice service; the first cell corresponds to first access network equipment, and the first access network equipment is access network equipment which is accessed by the terminal equipment before accessing the second access network equipment; the third measurement report is used for indicating a fourth cell, and the fourth cell is a cell in which the signal strength in the second PLMN network meets a second preset condition;

The second access network equipment generates third indication information according to the third measurement report; the third indication information is used for indicating the terminal equipment to access the fourth cell;

and the second access network equipment sends the third indication information to the terminal equipment.

17. The method according to claim 16, wherein the third measurement report is a measurement report generated by at least one cell in the second PLMN network after the terminal device completes voice traffic.

18. The method according to claim 16 or 17, wherein the second PLMN network is a roaming operator network of the terminal equipment.

19. The method according to claim 16 or 17, characterized in that the fourth cell is a 5G cell in the roaming operator network.

20. A communication device, comprising: a processing unit and a communication unit;

the processing unit is configured to instruct the communication unit to send a first measurement report to a first access network device; the communication device is terminal equipment for performing voice service in a first cell, the first cell belongs to a first Public Land Mobile Network (PLMN), the first access network equipment is access network equipment currently accessed by the terminal equipment, and the first measurement report is used for indicating that the signal strength of the first cell and the second cell meets a connection state mobility event; the second cell belongs to a second PLMN network;

The processing unit is further configured to instruct the communication unit to receive first indication information from the first access network device, where the first indication information is used to instruct the terminal device to access a third cell; the third cell belongs to the first PLMN network;

the processing unit is further configured to access the third cell in response to the first indication information.

21. The apparatus according to claim 20, wherein the processing unit is specifically configured to:

instructing the communication unit to receive second instruction information from the first access network device; the second indication information is used for indicating the terminal equipment to measure the signal strength of at least one cell in the first PLMN network;

measuring the signal intensity of the at least one cell, and determining a cell of the at least one cell, the signal intensity of which meets a first preset condition, as the third cell;

instructing the communication unit to send a second measurement report to the first access network device; the second measurement report is used to indicate the third cell.

22. The apparatus according to claim 20 or 21, wherein the processing unit is specifically configured to:

Instructing the communication unit to send a third measurement report to the second access network device; the second access network device is an access network device corresponding to the third cell; the third measurement report is used for indicating a fourth cell, and the fourth cell is a cell in which the signal strength in the second PLMN network meets a second preset condition;

instructing the communication unit to receive third instruction information from the second access network device; the third indication information is used for indicating the terminal equipment to access the fourth cell;

and responding to the third indication information, and accessing the fourth cell.

23. The apparatus of claim 20 or 21, wherein the first measurement report comprises at least one of:

the signal intensity of the second cell is higher than that of the first cell;

the signal strength of the first cell is lower than a third threshold value.

24. The apparatus of claim 22, wherein the third measurement report is a measurement report generated by at least one cell in the second PLMN network after the terminal device completes the voice service.

25. The apparatus according to claim 20 or 21, wherein the second PLMN network is a PLMN network with no interoperable interface configured with the first PLMN network.

26. The apparatus according to claim 20 or 21, wherein the first PLMN network is a home operator network of the terminal device;

27. The apparatus of claim 26, wherein the first cell is a fifth generation mobile communication technology 5G cell in the home operator network;

the second cell is a 5G cell in the roaming operator network;

28. The apparatus of claim 22, wherein the fourth cell is a 5G cell of a roaming operator of the terminal device.

29. A communication device, comprising: a processing unit and a communication unit;

the processing unit is configured to instruct the communication unit to receive a first measurement report from a terminal device; the terminal equipment is terminal equipment for performing voice service in a first cell, the first cell belongs to a first Public Land Mobile Network (PLMN), the communication device is first access network equipment which is currently accessed by the terminal equipment, and the first measurement report is used for indicating that the signal strength of the first cell and the second cell meets a connection state mobility event; the second cell belongs to a second PLMN network;

The processing unit is further used for generating first indication information according to the first measurement report; the first indication information is used for indicating the terminal equipment to access a third cell; the third cell belongs to the first PLMN network;

the processing unit is configured to instruct the communication unit to send first instruction information to the terminal device.

30. The apparatus according to claim 29, wherein the processing unit is configured to:

generating second indication information; the second indication information is used for indicating the terminal equipment to measure the signal strength of at least one cell in the first PLMN network;

instructing the communication unit to transmit the second instruction information to the terminal device;

instruct the communication unit to receive a second measurement report from the terminal device; the second measurement report is used for indicating the third cell;

and generating the first indication information according to the second measurement report.

31. The apparatus of claim 29 or 30, wherein the first measurement report comprises at least one of:

the signal intensity of the second cell is higher than that of the first cell;

the signal strength of the first cell is lower than a third threshold value.

32. The apparatus according to claim 29 or 30, wherein the second PLMN network is a PLMN network with no interoperable interface configured with the first PLMN network.

33. The apparatus according to claim 29 or 30, wherein the first PLMN network is a home operator network of the terminal device;

34. The apparatus of claim 33, wherein the first cell is a fifth generation 5G cell in the home operator network;

the second cell is a 5G cell in the roaming operator network;

the third cell is a fourth generation 4G cell in the home operator network.

35. A communication device, comprising: a processing unit and a communication unit;

the processing unit is configured to instruct the communication unit to receive a third measurement report from the terminal device; the second access network device is an access network device corresponding to a third cell in the first PLMN network, and the terminal device is a terminal device which moves from the first cell to the third cell in the first PLMN and is in voice service; the first cell corresponds to first access network equipment, and the first access network equipment is access network equipment which is accessed by the terminal equipment before accessing the second access network equipment; the third measurement report is used for indicating a fourth cell, and the fourth cell is a cell in which the signal strength in the second PLMN network meets a second preset condition; the communication device is second access network equipment corresponding to a third cell; the third cell belongs to a first PLMN network;

The processing unit is further configured to generate third indication information according to the third measurement report; the third indication information is used for indicating the terminal equipment to access the fourth cell;

the processing unit is further configured to instruct the communication unit to send the third instruction information to the terminal device.

36. The apparatus of claim 35, wherein the third measurement report is a measurement report generated by at least one cell in the second PLMN network after the terminal device completes voice traffic.

37. The apparatus according to claim 35 or 36, wherein the second PLMN network is a roaming operator network of the terminal device.

38. The apparatus according to claim 35 or 36, wherein the fourth cell is a 5G cell in the roaming operator network.

39. An electronic device, comprising: a processor and a memory; wherein the memory is configured to store computer-executable instructions that, when executed by the electronic device, cause the electronic device to perform the communication method of any of claims 1-19.

40. A computer-readable storage medium comprising instructions that, when executed by an electronic device, cause the computer to perform the communication method of any of claims 1-19.