Communication method and apparatus, electronic device, and storage medium

Abstract

The application provides a communication method and device, electronic equipment and storage medium, relates to the technical field of communication, and solves the problem that the voice service continuity of a terminal device cannot be ensured when the terminal device roams in a 5G core network in the prior art. The method comprises the following steps: a terminal device sends a first measurement report to a first access network device; wherein the terminal device is a terminal device performing voice service in a first cell, the first cell belongs to a first PLMN network, and the first measurement report is used to indicate that the signal strengths of the first cell and a second cell satisfy a connected state mobility event; the second cell belongs to a second PLMN network; the terminal device receives first indication information from the first access network device, and the first indication information is used to indicate that the terminal device accesses a third cell; the third cell belongs to the first PLMN network; and the terminal device accesses the third cell in response to the first indication information. The application is used for improving the voice service continuity of the terminal device.

Description

Technical Field

[0001] This application relates to the field of information processing technology, and in particular to a communication method, apparatus, electronic device and storage medium. Background Technology

[0002] In 5G core network roaming scenarios, due to the lack of interoperability between the home and roaming networks, and the absence of support for this interoperability interface between terminal and network devices, a connected terminal device moving from its home operator's 5G network to the roaming operator's 5G network must first disconnect from the home operator's 5G network and then reconnect to the roaming 5G network. This can lead to dropped calls and other issues with voice service continuity, severely impacting the user's 5G roaming experience. Summary of the Invention

[0003] This application provides a communication method, apparatus, electronic device, and storage medium, which solves the problem in the prior art that the voice service continuity of terminal devices cannot be guaranteed when roaming in the 5G core network.

[0004] In a first aspect, a communication method is provided, comprising: a terminal device sending a first measurement report to a first access network device; wherein the terminal device is a terminal device performing voice services in a first cell, the first cell belongs to a first public land mobile network (PLMN), the first access network device is the access network device currently accessed by the terminal device, and the first measurement report is used to indicate that the signal strength of the first cell and the second cell meets the connected mobility event; the second cell belongs to a second PLMN network; the terminal device receives first indication information from the first access network device, the first indication information being used to indicate that the terminal device accesses a third cell; the third cell belongs to the first PLMN network; and in response to the first indication information, the terminal device accesses the third cell.

[0005] In conjunction with the first aspect above, in one possible implementation, the method further includes: the terminal device receiving second indication information from the first access network device; the second indication information instructing the terminal device to measure the signal strength of at least one cell in the first PLMN network; the terminal device measuring the signal strength of at least one cell and determining that the cell whose signal strength meets the first preset condition among the at least one cells is the third cell; the terminal device sending a second measurement report to the first access network device; the second measurement report indicating the third cell.

[0006] In conjunction with the first aspect above, in one possible implementation, the method further includes: the terminal device sending a third measurement report to a second access network device; the second access network device being an access network device corresponding to a third cell; the third measurement report being used to indicate a fourth cell, the fourth cell being a cell in the second PLMN network whose signal strength meets a second preset condition; the terminal device receiving third indication information from the second access network device; the third indication information being used to instruct the terminal device to access the fourth cell; and in response to the third indication information, the terminal device accessing the fourth cell.

[0007] In conjunction with the first aspect above, in one possible implementation, 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, and the signal strength of the second cell is higher than a second threshold; the signal strength of the first cell is lower than a third threshold.

[0008] In conjunction with the first aspect above, in one possible implementation, the third measurement report is a measurement report generated by measuring at least one cell in the second PLMN network after the terminal device completes the voice service.

[0009] In conjunction with the first aspect mentioned above, in one possible implementation, the second PLMN network is a PLMN network that does not have an interoperability interface configured with the first PLMN network.

[0010] In conjunction with the first aspect mentioned above, in one possible implementation, the first PLMN network is the home operator network of the terminal device; the second PLMN network is the roaming operator network of the terminal device.

[0011] In conjunction with the first aspect mentioned above, in one possible implementation, the first cell is a 5G cell in the home operator's network; the second cell is a 5G cell in the roaming operator's network; and the third cell is a 4G cell in the home operator's network.

[0012] In conjunction with the first aspect mentioned above, in one possible implementation, the fourth cell is the 5G cell of the roaming operator of the terminal device.

[0013] In a second aspect, a communication method is provided, comprising: a first access network device receiving a first measurement report from a terminal device; wherein the terminal device is a terminal device performing voice services in a first cell, the first cell belongs to a first public land mobile network (PLMN), the first access network device is the access network device currently accessed by the terminal device, and the first measurement report is used to indicate that the signal strength of the first cell and the second cell meets the connected mobility event; the second cell belongs to a second PLMN network; the first access network device generates first indication information based on the first measurement report; wherein the first indication information is used to indicate that the terminal device accesses a third cell; the third cell belongs to the first PLMN network; and the first access network device sends the first indication information to the terminal device.

[0014] In conjunction with the second aspect above, in one possible implementation, the method further includes: a first access network device generating second indication information; the second indication information being used to instruct a terminal device to measure the signal strength of at least one cell in a first PLMN network; the first access network device sending the second indication information to the terminal device; the first access network device receiving a second measurement report from the terminal device; the second measurement report being used to indicate a third cell; and the first access network device generating first indication information based on the second measurement report.

[0015] In conjunction with the second aspect above, in one possible implementation, 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, and the signal strength of the second cell is higher than a second threshold; the signal strength of the first cell is lower than a third threshold.

[0016] In conjunction with the second aspect above, in one possible implementation, the second PLMN network is a PLMN network that does not have an interoperability interface configured with the first PLMN network.

[0017] In conjunction with the second aspect above, in one possible implementation, the first PLMN network is the home operator network of the terminal device; the second PLMN network is the roaming operator network of the terminal device.

[0018] In conjunction with the second aspect above, in one possible implementation, the first cell is a fifth-generation 5G cell in the home operator's network; the second cell is a 5G cell in the roaming operator's network; and the third cell is a fourth-generation 4G cell in the home operator's network.

[0019] Thirdly, a communication method is provided, comprising: a second access network device receiving a third measurement report from a terminal device; the third measurement report being used to indicate a fourth cell, wherein the fourth cell is a cell in a second PLMN network whose signal strength meets a second preset condition; the second access network device generating third indication information based on the third measurement report; the third indication information being used to instruct the terminal device to access the fourth cell; and the second access network device sending the third indication information to the terminal device.

[0020] In conjunction with the third aspect mentioned above, in one possible implementation, the third measurement report is a measurement report generated by measuring at least one cell in the second PLMN network after the terminal device completes the voice service.

[0021] In conjunction with the third aspect mentioned above, in one possible implementation, the second PLMN network is the roaming operator network of the terminal device.

[0022] In conjunction with the third aspect mentioned above, in one possible implementation, the fourth cell is a 5G cell in the roaming operator's network.

[0023] Fourthly, a communication device is provided, 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; wherein the communication device is a terminal device performing voice services in a first cell, the first cell belongs to a first public land mobile network (PLMN), the first access network device is the access network device currently accessed by the terminal device, and the first measurement report is configured to indicate that the signal strength of the first cell and the second cell meets the connected 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, the first indication information being configured 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.

[0024] In conjunction with the fourth aspect above, in one possible implementation, the processing unit is specifically configured to: instruct the communication unit to receive second instruction information from the first access network device; the second instruction information is used to instruct the terminal device to measure the signal strength of at least one cell in the first PLMN network; measure the signal strength of at least one cell, and determine that the cell whose signal strength meets the first preset condition among the at least one cells is the third cell; instruct 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.

[0025] In conjunction with the fourth aspect above, in one possible implementation, the processing unit is specifically configured to: instruct 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 to indicate the fourth cell, the fourth cell being a cell in the second PLMN network whose signal strength meets the second preset condition; instruct the communication unit to receive third indication information from the second access network device; the third indication information is used to instruct the terminal device to access the fourth cell; and in response to the third indication information, access the fourth cell.

[0026] In conjunction with the fourth aspect above, in one possible implementation, 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, and the signal strength of the second cell is higher than a second threshold; the signal strength of the first cell is lower than a third threshold.

[0027] In conjunction with the fourth aspect above, in one possible implementation, the third measurement report is a measurement report generated by measuring at least one cell in the second PLMN network after the terminal device completes the voice service.

[0028] In conjunction with the fourth aspect above, in one possible implementation, the second PLMN network is a PLMN network that does not have an interoperability interface configured with the first PLMN network.

[0029] In conjunction with the fourth aspect mentioned above, in one possible implementation, the first PLMN network is the home operator network of the terminal device; the second PLMN network is the roaming operator network of the terminal device.

[0030] In conjunction with the fourth aspect mentioned above, in one possible implementation, the first cell is a 5G cell in the home operator's network; the second cell is a 5G cell in the roaming operator's network; and the third cell is a 4G cell in the home operator's network.

[0031] In conjunction with the fourth aspect mentioned above, in one possible implementation, the fourth cell is the 5G cell of the roaming operator of the terminal device.

[0032] Fifthly, a communication device is provided, 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; wherein the terminal device is a terminal device performing voice services in a first cell, the first cell belonging to a first public land mobile network (PLMN), the communication device is a first access network device currently accessed by the terminal device, and the first measurement report is used to indicate that the signal strength of the first cell and the second cell meets the connectivity mobility event; the second cell belongs to a second PLMN network; the processing unit is further configured to generate first indication information based on the first measurement report; wherein 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 configured to instruct the communication unit to send the first indication information to the terminal device.

[0033] In conjunction with the fifth aspect above, in one possible implementation, the processing unit is specifically configured to: generate 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; instruct the communication unit to send the second indication 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 to indicate a third cell; and generate first indication information based on the second measurement report.

[0034] In conjunction with the fifth aspect above, in one possible implementation, 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, and the signal strength of the second cell is higher than a second threshold; the signal strength of the first cell is lower than a third threshold.

[0035] In conjunction with the fifth aspect above, in one possible implementation, the second PLMN network is a PLMN network that does not have an interoperability interface configured with the first PLMN network.

[0036] In conjunction with the fifth aspect mentioned above, in one possible implementation, the first PLMN network is the home operator network of the terminal device; the second PLMN network is the roaming operator network of the terminal device.

[0037] In conjunction with the fifth aspect mentioned above, in one possible implementation, the first cell is a fifth-generation 5G cell in the home operator's network; the second cell is a 5G cell in the roaming operator's network; and the third cell is a fourth-generation 4G cell in the home operator's network.

[0038] A sixth aspect provides 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 a terminal device; the third measurement report is configured to indicate a fourth cell, the fourth cell being a cell in a second PLMN network whose signal strength meets a second preset condition; the communication device is a second access network device corresponding to the third cell; the third cell belongs to a first PLMN network; the processing unit is further configured to generate third indication information based on the third measurement report; the third indication information is configured to instruct the terminal device to access the fourth cell; the processing unit is further configured to instruct the communication unit to send the third indication information to the terminal device.

[0039] In conjunction with the sixth aspect above, in one possible implementation, the third measurement report is a measurement report generated by measuring at least one cell in the second PLMN network after the terminal device completes the voice service.

[0040] In conjunction with the sixth aspect mentioned above, in one possible implementation, the second PLMN network is the roaming operator network of the terminal device.

[0041] In conjunction with the sixth aspect mentioned above, in one possible implementation, the fourth cell is a 5G cell in the roaming operator's network.

[0042] In a seventh aspect, this application provides an electronic device comprising: a processor and a communication interface; the communication interface and the processor are coupled, the processor being configured to execute computer programs or instructions to implement the communication method as described in the first aspect and any possible implementation thereof.

[0043] Eighthly, this application provides an electronic device comprising: a processor and a communication interface; the communication interface and the processor are coupled, the processor being configured to execute computer programs or instructions to implement the communication method as described in the second aspect and any possible implementation thereof.

[0044] Ninthly, this application provides an electronic device comprising: a processor and a communication interface; the communication interface and the processor are coupled, the processor being configured to execute computer programs or instructions to implement the communication method as described in the third aspect and any possible implementation thereof.

[0045] In a tenth aspect, this application provides a computer-readable storage medium storing instructions that, when executed by a processor of a communication device, enable the communication device to perform the communication method as described in the first aspect and any possible implementation thereof.

[0046] Eleventhly, this application provides a computer-readable storage medium storing instructions that, when executed by a processor of a communication device, enable the communication device to perform the communication method as described in the second aspect and any possible implementation thereof.

[0047] In a twelfth aspect, this application provides a computer-readable storage medium storing instructions that, when executed by a processor of a communication device, enable the communication device to perform the communication method as described in the third aspect and any possible implementation thereof.

[0048] In this application, the names of the aforementioned communication devices do not limit the devices or functional modules themselves. In actual implementation, these devices or functional modules may appear under other names. As long as the functions of each device or functional module are similar to those of this invention, they fall within the scope of the claims of this invention and their equivalents.

[0049] These or other aspects of the invention will become more apparent from the following description.

[0050] The technical solution provided in this application brings at least the following beneficial effects: when a terminal device accesses the first cell of the first PLMN network and performs voice services in the first cell, if the terminal device triggers a connected mobility event, the access network device does not instruct the terminal device to access the second cell of the second PLMN, but instead instructs the terminal device to access the third cell of the first PLMN network.

[0051] Since different networks within the same PLMN network typically have interoperability interfaces, these interfaces allow terminal devices to be switched or redirected to cells within the same PLMN network without affecting voice service continuity. Therefore, in the technical solution provided in this application, the access network device can instruct the terminal device to switch to a cell within the same PLMN network to continue voice service when the terminal device is performing voice service and triggers a mobility event, thus avoiding voice service interruption caused by switching to cells in different PLMN networks. Therefore, the communication method provided in this application can improve the voice service continuity of terminal devices, thereby enhancing the user's network experience. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of the structure of a communication device provided in an embodiment of this application;

[0053] Figure 2 A schematic diagram illustrating the mobility of a terminal device during roaming in a 5G core network, provided as an embodiment of this application;

[0054] Figure 3 This application provides a schematic diagram illustrating the connection between the home network and the roaming network in a 5G core network roaming scenario.

[0055] Figure 4 A flowchart illustrating a communication method provided in an embodiment of this application;

[0056] Figure 5 A flowchart illustrating another communication method provided in an embodiment of this application;

[0057] Figure 6 This is a schematic diagram of the structure of another communication device provided in an embodiment of this application;

[0058] Figure 7 This is a schematic diagram of the structure of another communication device provided in an embodiment of this application;

[0059] Figure 8 This is a schematic diagram of another communication device provided in an embodiment of this application. Detailed Implementation

[0060] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0061] The terms "first" and "second," etc., used in the specification and drawings of this application are used to distinguish different objects or to distinguish different treatments of the same object, rather than to describe a specific order of objects.

[0062] Furthermore, the terms "comprising" and "having," and any variations thereof, used in the description of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include other steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0063] It should be noted that in the embodiments of this application, the words "exemplary" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design schemes. Specifically, the use of the words "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0064] In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0065] To implement the communication method provided in the embodiments of this application, the embodiments of this application provide a communication device for executing the communication method. Figure 1 This is a schematic diagram of a communication device provided in an embodiment of this application. Figure 1 As shown, 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, memory 103, and communication interface 104 can be connected via the communication line 102.

[0066] The processor 101 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application, such as one or more digital signal processors (DSPs), or one or more field-programmable gate arrays (FPGAs).

[0067] Communication line 102 may include a path for transmitting information between the aforementioned components.

[0068] The communication interface 104 is used to communicate with other devices or communication networks. It can use any transceiver-like device, such as Ethernet, radio access network (RAN), wireless local area network (WLAN), etc.

[0069] The memory 103 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium capable of including or storing desired program code having the form of instructions or data structures and accessible by a computer, but not limited thereto.

[0070] In one possible design, the memory 103 can exist independently of the processor 101, meaning the memory 103 can be an external memory of the processor 101. In this case, the memory 103 can be connected to the processor 101 via a communication line 102 to store execution instructions or application code, and its execution is controlled by the processor 101 to implement the communication method provided in the following embodiments of this application. In another possible design, the memory 103 can also be integrated with the processor 101, meaning the memory 103 can be an internal memory of the processor 101. For example, the memory 103 can be a cache, which can be used to temporarily store some data and instruction information.

[0071] As one possible implementation, processor 101 may include one or more CPUs, for example Figure 1 CPU0 and CPU1 in the example. Alternatively, the communication device 100 may include multiple processors, such as CPU0 and CPU1. Figure 1 The processors 101 and 107 are included. Alternatively, the communication device 100 may also include an output device 105 and an input device 106.

[0072] The following explanations of the terms used in the embodiments of this application are provided to facilitate the reader's understanding.

[0073] 1. 5G inter-network roaming

[0074] 5G inter-network roaming refers to a roaming method in which a terminal device belonging to operator A accesses the 5G network of operator B, and operator B provides 5G network services for the terminal device.

[0075] 5G inter-network roaming is typically used in scenarios where an area is covered by the 5G network of operator B but not by operator B's 5G network. Network deployment based on 5G inter-network roaming can accelerate 5G infrastructure construction, reduce redundant 5G network construction, and achieve 5G network coverage and business development in a compact and efficient manner.

[0076] Currently, 5G inter-network roaming includes two methods: 5G core network roaming and 5G access network roaming. This application mainly relates to 5G core network roaming, and the implementation methods of 5G core network roaming are described in detail below.

[0077] 2. 5G core network roaming

[0078] 5G core network roaming refers to a situation where, within a certain network coverage area, if one operator (e.g., operator B) has constructed a 5G network (including the access network and core network) within that area, terminal devices belonging to other operators (e.g., operator A) can also access the 5G network built by operator B through roaming. Operator B's 5G network then provides 5G network services to the terminal devices belonging to operator A. In this scenario, for the terminal device, operator B is designated as the roaming operator, operator A as the home operator, and the network coverage area is designated as the roaming area.

[0079] In 5G core network roaming, based on whether the home operator has a wireless signal in the roaming area, 5G core network roaming is divided into the following two scenarios.

[0080] Scenario 1: The home operator has no wireless network signal in the roaming area, while the roaming operator has 4G or 5G signals in the roaming area, and the terminal device only uses the 5G network of the roaming network.

[0081] Specifically, Scene 1 includes both outward and inward scenes. These will be explained separately below:

[0082] Roaming Out Scenario: When a terminal device enters a roaming area, it will prioritize using the roaming operator's 5G network to provide 5G roaming services; the roaming operator will not provide 4G roaming services. In this scenario, the roaming operator does not support the terminal device's voice services falling back to the roaming operator's 4G network.

[0083] Roaming back scenario: The user's terminal device leaves the roaming area and finds its home operator's network signal (which can be a 4G or 5G network signal). The terminal device rejoins the home operator's network, and the home operator provides network services to the terminal device. In this scenario, the terminal device can perform voice service fallback normally.

[0084] In Scenario 1, the roaming scenario means that since the home operator's network has no signal in the roaming area, the home operator's terminal devices will, by default, only operate on the roaming network's 5G network after roaming to the shared area. In this scenario, the roaming operator will not need to support service continuity for the terminal devices.

[0085] However, in the roaming scenario of Scenario 1, when a terminal device moves from its home operator network (hereinafter referred to as the home network) to the roaming operator network (hereinafter referred to as the roaming network), after disconnecting from the home network, the terminal device needs a relatively long time to reconnect to the roaming network. This may result in a prolonged interruption of the user's ongoing services and a poor user experience.

[0086] Scenario 2: The home operator has 4G network signal but no 5G network signal in the roaming area, while the roaming operator has either 4G or 5G network in the roaming area. The terminal device prioritizes using the roaming operator's 5G network in the roaming area. When the roaming operator's 5G network coverage is insufficient, it uses the home operator's 4G network.

[0087] Scene 2 also includes out-of-scene and out-of-scene scenarios, which will be explained below.

[0088] Roaming Scenario: When a user's terminal device enters a roaming area, the terminal device will prioritize using the roaming operator's 5G network to provide 5G roaming services. When the roaming operator's 5G network coverage is insufficient, the terminal device will use its home operator's 4G network.

[0089] Roaming back scenario: The user's terminal device leaves the roaming area and searches for a home operator's network signal (which can be a 4G or 5G network signal). The terminal device returns to the home operator's network, and the home operator provides network services to the terminal device.

[0090] Currently, there is no discussion on methods for ensuring service continuity in Scenario 2, and there are no service standards or equipment to support service continuity in Scenario 2. Therefore, how to improve service continuity in 5G inter-network roaming scenarios has become an urgent technical problem to be solved.

[0091] In this embodiment, it is mainly used to solve the voice service continuity problem in scenario 2 of the above-mentioned 5G core network roaming.

[0092] like Figure 2 The diagram illustrates the mobility of a terminal device during 5G core network roaming, as provided in an embodiment of this application. Scenario 2 includes region 1 and region 2, where the home operator's 5G network covers region 1, and the roaming operator's 5G network covers region 2 (region 2 is also referred to as the roaming region). The home operator's 4G network covers both region 1 and region 2.

[0093] When the terminal device is in such Figure 2 When moving between the shown areas 1 and 2, the movement of the terminal device includes at least the following cases 1-4.

[0094] Scenario 1: The terminal device moves from the home operator's 4G network to the roaming operator's 5G network.

[0095] Scenario 2: The terminal device moves from the roaming operator's 5G network to the home operator's 4G network.

[0096] Scenario 3: The terminal device moves from the home operator's 5G network to the roaming operator's 5G network.

[0097] Scenario 4: The terminal device is moved from the roaming operator's 5G network to the home operator's 5G network.

[0098] like Figure 3 The diagram shown is a connection diagram of the home network and the roaming network in a 5G core network roaming scenario provided in an embodiment of this application.

[0099] The home network includes the home operator's 5G core network, home operator's 4G core network, home operator's Internet Protocol (IP) Multimedia Subsystem (IMS) network, home operator's 5G access network, and home operator's 4G access network.

[0100] The roaming network includes the roaming operator's 5G core network and the roaming operator's 5G access network.

[0101] In 5G core network roaming scenarios, when a terminal device moves from its home network to the roaming network, the data generated by the terminal device in the roaming network is returned to the home network via home routing, where the home network processes the service data generated by the terminal device. The signaling planes of the home network's core network (including the home operator's 5G core network (5GC) and 4G core network's evolved packet core (EPC)) and the roaming network's core network (including the roaming operator's 5GC) are connected through security edge protection proxies (SEEP). The user plane is connected via edge routers through the user plane function (UPF) between the home network and the visited network.

[0102] The signaling interface between the home network and the roaming network includes the roaming interface and the interoperability interface. The current international and industry standards do not define the interoperability interface, and the current terminal equipment and network equipment do not support the interoperability interface in the 5G core network roaming scenario.

[0103] Because the interoperability interface between the home network and the roaming network is currently not established, and terminal devices and network devices do not support the interoperability interface in 5G core network roaming scenarios, in 5G core network roaming scenarios, if a connected terminal device moves from the home operator's 5G network to the roaming operator's 5G network, the terminal device needs to first disconnect from the home operator's 5G network and then reconnect to the roaming 5G network. This will lead to issues such as dropped calls and disconnections in the terminal device's voice service, compromising the continuity of the terminal device's voice service and severely impacting the user's 5G roaming experience.

[0104] To address the issue in existing technologies where the continuity of voice services for a connected terminal device is not guaranteed when it moves from its home operator's 5G network to a roaming operator's 5G network, this application provides a communication method to ensure that the terminal device completes its voice service within its home operator's network when it is conducting voice services from its home operator's 5G network and triggers mobility management for moving to a roaming 5G network. This ensures that the terminal device's voice service always occurs within its home operator's network, preventing dropped calls due to the terminal device's mobility, significantly improving voice service continuity and enhancing the user's network experience.

[0105] like Figure 4 As shown, this is a communication method provided in an embodiment of the present application, which includes the following steps S401-S404.

[0106] S401. The terminal device sends a first measurement report to the first access network device. Correspondingly, the first access network device receives the first measurement report from the terminal device.

[0107] The terminal device is a terminal device that performs voice services in the first cell, which belongs to the first public land mobile network (PLMN) network. The first access network device is the access network device that the terminal device is currently connected to. The first measurement report is used to indicate that the signal strength of the first cell and the second cell meets the connectivity mobility event. The second cell belongs to the second PLMN network.

[0108] Optionally, the first PLMN network is the home operator network of the terminal device; the second PLMN network is the roaming operator network of the terminal device; the second PLMN network is a PLMN network that does not have an interoperability 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.

[0109] Accordingly, S401 can be implemented through the following process: The terminal device is conducting a voice call through the 5G cell of its home operator. During the call, the terminal device continuously measures the signal strength of the current serving cell (first cell) and its neighboring cells. When the terminal device detects that the signal strength of the first cell and the second cell meets the mobility event requirements of the terminal device in connected state, the terminal device generates a first measurement report. The terminal device sends the first measurement report to the first access network device. Correspondingly, the first access network device receives the first measurement report from the terminal device.

[0110] In one possible implementation, the first measurement report includes at least one of the following:

[0111] a) The signal strength of the second cell is higher than that of the first cell. That is, the signal strength of the 5G cell in the roaming network is higher than that of the currently serving cell.

[0112] (b) The signal strength of the first cell is lower than the first threshold, and the signal strength of the second cell is higher than the second threshold. That is, the signal strength of the currently serving cell is lower than the first threshold, and the signal strength of the 5G cell in the roaming network is higher than the second threshold.

[0113] c) The signal strength of the first cell is lower than the third threshold. That is, the signal strength of the currently serving cell is lower than the third threshold.

[0114] It should be noted that the mobility events in the connected state described in the embodiments of this application include handover events and redirection events of the terminal device in the connected state.

[0115] S402. The first access network device generates first indication information based on the first measurement report.

[0116] The first instruction information is used to instruct the terminal device to access the third cell; the third cell belongs to the first PLMN network.

[0117] Optionally, the third cell is a 4G cell in the home network. That is to say, the first indication information is used to instruct the terminal device to access a 4G cell in the home network.

[0118] In one possible implementation, the way the terminal device indicated by the first indication information accesses the third cell varies depending on the mobility event triggered by the first measurement report.

[0119] For example, if 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 hand over to the 4G cell (i.e., the third cell) in the home network.

[0120] In the case where the mobility event triggered by the first measurement report is a redirection event, the first indication information is used to instruct the terminal device to redirect to a 4G cell in the home network.

[0121] In this embodiment of the application, the first cell is a 5G cell in the home network, the second cell is a 5G cell in the roaming network, and the third cell is a 4G cell in the home network, as examples for illustration.

[0122] S403. The first access network device sends a first indication message to the terminal device. Correspondingly, the terminal device receives the first indication message from the first access network device.

[0123] S404. In response to the first instruction information, the terminal device accesses the third cell.

[0124] In one possible implementation, the action procedure for the terminal device to access the 4G cell in the home network differs depending on the method of accessing the 4G cell in the home network as indicated by the first instruction information.

[0125] For example, if the first instruction information is used to instruct the terminal device to switch to a 4G cell in the home network, the terminal device performs the corresponding handover procedure to switch to a 4G cell in the home network.

[0126] When the first instruction information is used to instruct the terminal device to redirect to a 4G cell in the home network, the terminal device executes the corresponding redirection procedure to redirect to a 4G cell in the home network.

[0127] It should be noted that after the terminal device connects to the third cell, it continues to provide voice services on the third cell to ensure the continuity of the terminal device's voice services.

[0128] It should be noted that the voice services described in the embodiments of this application include voice call services, data call services, video call services, etc., and this application does not limit them.

[0129] The above embodiments bring at least the following beneficial effects: when a terminal device accesses the first cell of the first PLMN network and performs voice services in the first cell, if the terminal device triggers a connected mobility event, the access network device does not instruct the terminal device to access the second cell of the second PLMN, but instead instructs the terminal device to access the third cell of the first PLMN network.

[0130] Since different networks within the same PLMN network typically have interoperability interfaces, these interfaces allow terminal devices to be switched or redirected to cells within the same PLMN network without affecting voice service continuity. Therefore, in the technical solution provided in this application, the access network device can instruct the terminal device to switch to a cell within the same PLMN network to continue voice service when the terminal device is performing voice service and triggers a mobility event, thus avoiding voice service interruption caused by switching to cells in different PLMN networks. Therefore, the communication method provided in this application can improve the voice service continuity of terminal devices, thereby enhancing the user's network experience.

[0131] The communication method provided in the embodiments of this application has been generally described above. It should be noted that before generating the first indication information, the access network device usually needs to instruct the terminal device to measure the signal strength of the cell under the first PLMN network to determine the third cell. The process is described below.

[0132] Combination Figure 4 ,like Figure 5 As shown, after S401 and before S402, the communication method provided in this application embodiment further includes the following S501-S505:

[0133] S501, The first access network device generates the second indication information.

[0134] The second instruction information is used to instruct the terminal device to measure the signal strength of at least one cell in the first PLMN network.

[0135] Specifically, after receiving the first measurement report from the terminal device, the first access network device makes the following judgments: the first access network device needs to determine whether the terminal device is currently performing a voice service; the first access network device determines whether the first measurement report is used to trigger the terminal device to switch to a cell in a different PLMN network. If so, the first access network device further determines whether a cross-PLMN interoperability interface (usually the N14 interface) is not configured between the first PLMN network and the second PLMN network (e.g., between the access and mobility management function (AMF) of the first PLMN and the AMF of the second PLMN).

[0136] If the first access network device determines that the terminal device is performing a voice service, the first measurement report is used to trigger the terminal device to switch to a cell in a different PLMN network, and no cross-PLMN interoperability interface is configured between the first PLMN network and the second PLMN network, then the first access network device generates the second indication information.

[0137] In one possible implementation, the second indication information includes at least one of the following: frequency information of the cell to be measured and cell identifier.

[0138] Optionally, the second indication information indicates at least one cell with a network standard different from that of the first cell. Alternatively, the second indication information indicates at least one cell with the same network standard as that of the first cell.

[0139] This application mainly uses the example of at least one cell indicated by the second instruction information being a cell with a network standard different from that of the first cell mentioned above.

[0140] For example, if the first cell is a 5G cell in the first PLMN network, the second indication information indicates at least one cell that is a 4G cell in the first PLMN network.

[0141] S502, the first access network device sends a second indication message to the terminal device. Correspondingly, the terminal device receives the second indication message from the first access network device.

[0142] S503. The terminal device measures the signal strength of at least one cell and determines the cell whose signal strength meets the first preset condition as the third cell.

[0143] Specifically, after receiving the second indication information, the terminal device determines the cell information (e.g., cell frequency information, cell identifier, etc.) of at least one cell indicated by the second indication information. The terminal device initiates measurement based on the cell information of the at least one cell to determine the signal strength of each cell in the at least one cell. Based on the signal strength of each cell in the at least one cell, the terminal device selects a cell that meets a first preset condition from the at least one cell as the third cell.

[0144] In one possible implementation, the first preset condition is: the signal strength is greater than the fourth threshold value. Alternatively, the first preset condition is: the signal cell is at its maximum size. Furthermore, the first preset condition can be other conditions, which are not limited in this application.

[0145] S504, The terminal device generates a second measurement report.

[0146] The second measurement report is used to indicate the third cell.

[0147] Specifically, after the terminal device identifies the third cell, it sends the cell identifier of the third cell to the first access network device along with the second measurement report. In addition, the second measurement report may also include information such as the signal strength of the third cell.

[0148] It should be noted that the above S503 and S504 mainly illustrate the example of the terminal device measuring the signal strength of at least one cell to determine the third cell and reporting the first cell to the first access network device. In actual implementation, after the terminal device measures the signal strength of at least one cell, it can also send the signal strength of each cell in a second measurement report to the first access network device, which will then select the third cell based on the signal strength of the at least one cell.

[0149] S505, the terminal device sends a second measurement report to the first access network device. Correspondingly, the first access network device receives the second measurement report from the terminal device.

[0150] Correspondingly, S402 can be implemented through the following S506.

[0151] S506. The first access network device generates first indication information based on the second measurement report.

[0152] In one possible implementation, after receiving the second measurement report, the first access network device determines the third cell indicated by the second measurement report. The first access network device writes the cell identifier of the third cell (or 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 to generate first indication information.

[0153] The above scheme brings at least the following benefits: Before instructing the terminal device to access the third cell, the first access network device first instructs the terminal device to measure the signal strength of the cell of this type (e.g., a 4G cell in the first PLMN network) and select the cell whose signal strength meets the requirements as the third cell. This ensures that the terminal device can switch to the cell whose signal strength meets the requirements and ensure the call quality of the terminal device.

[0154] The above describes a method for ensuring the continuity of voice services when a terminal device triggers a mobility event in a different PLMN network while the first access network device is providing voice services.

[0155] After the terminal device completes voice service on the third cell, the second access network device can also instruct the terminal device to measure the signal strength of the cell under the second PLMN again, and instruct the terminal device to access the cell under the second PLMN when the signal strength of the cell under the second PLMN meets preset conditions. The process is described in detail below:

[0156] One possible implementation is, such as Figure 5 As shown, after S404, the communication method provided in this application embodiment further includes the following S507-S510:

[0157] S507. The terminal device sends a third measurement report to the second access network device. Correspondingly, the second access network device receives the third measurement report from the terminal device.

[0158] The second access network device is the access network device corresponding to the third cell; the third measurement report is used to indicate the fourth cell, which is the cell in the second PLMN network whose signal strength meets the second preset condition.

[0159] In one possible implementation, the second preset condition is: the signal strength is greater than the fifth threshold value. Alternatively, the second preset condition is: the signal cell is at its maximum size. Furthermore, the second preset condition can be other conditions, which are not limited in this application.

[0160] Optionally, the third measurement report is a measurement report generated by measuring at least one cell in the second PLMN network after the terminal device completes the voice service.

[0161] Optionally, at least one cell in the second PLMN network is at least one 5G cell in the second PLMN network.

[0162] The following is a detailed explanation of S507, using 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: The terminal device continues voice service through the second access network device. After the second access network device determines that the terminal device has completed the voice service, it determines that the terminal device supports fast return to the 5G cell. The second access network device then determines the information of the 5G cells that need to be measured and instructs the terminal device to measure the signal strength of these 5G cells. The terminal device measures the signal strength of these 5G cells and generates a third measurement report based on the cells whose signal strength meets the third preset condition. The terminal device sends the third measurement report to the second access network device. Correspondingly, the second access network device receives the third measurement report from the terminal device.

[0163] It should be noted that the second access network device is the access network device corresponding to the third cell. The terminal device accessing the third cell can also be understood as the terminal device accessing the second access network device.

[0164] S508, the second access network device generates third indication information based on the third measurement report. The third indication information is used to instruct the terminal device to access the fourth cell.

[0165] Similar to the first instruction information, the third instruction information is used to instruct the terminal device to switch to a 5G cell in the roaming network.

[0166] Alternatively, the first instruction information is used to instruct the terminal device to redirect to a 5G cell in the roaming network.

[0167] S509. The second access network sends a third instruction message to the terminal device. Correspondingly, the terminal device receives the third instruction message from the second access network device.

[0168] S510, in response to the third instruction information, the terminal device accesses the fourth cell.

[0169] Similar to the terminal device accessing a third cell, when the third indication information is used to instruct the terminal device to switch to a 5G cell in the roaming network, the terminal device executes the corresponding handover procedure to switch to the 5G cell in the roaming network.

[0170] When the third instruction information is used to instruct the terminal device to redirect to a 5G cell in the roaming network, the terminal device executes the corresponding redirection procedure to redirect to the 5G cell in the roaming network.

[0171] The above scheme brings at least the following benefits: After the terminal device completes its 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. When the signal strength of the 5G cell in the second PLMN network meets preset conditions, the second access network device instructs the terminal device to switch or redirect to the 5G cell in the second PLMN network. In this way, without affecting the continuity of the terminal device's voice service, the terminal device preferentially switches to the 5G cell of the roaming network, and the roaming network provides 5G network services to the terminal device, which can further improve the user's network experience.

[0172] It should be noted that the above explanation primarily assumes that the terminal device remains within the roaming area after ending its voice service, and that the terminal device prioritizes accessing a 5G cell in the roaming network. If, after ending the voice service, the terminal device has left the roaming area and entered the coverage area of ​​its home operator's 5G network, the second access network device can also instruct the terminal device to measure and access a 5G cell in its home network. This process is similar to the aforementioned process where the second access network device instructs the terminal device to measure and access a 5G cell in the roaming network, and will not be elaborated upon here.

[0173] As can be seen, the above mainly describes the technical solutions provided by the embodiments of this application from a methodological perspective. To achieve the above functions, it includes hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should readily recognize that, in conjunction with the modules and algorithm steps of the various examples described in the embodiments disclosed herein, the embodiments of this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed in hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this invention.

[0174] This application embodiment can divide the communication device into functional modules according to the above method example. For example, each function can be divided into its own functional module, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware or as a software functional module. Optionally, the module division in this application embodiment is illustrative and only represents one logical functional division; other division methods may be used in actual implementation.

[0175] like Figure 6 The diagram shown is a structural schematic of a communication device provided in an embodiment of this application. The communication device includes a communication unit 601 and a processing unit 602.

[0176] Processing unit 602 is configured to instruct communication unit 601 to send a first measurement report to a first access network device; wherein, the communication device is a terminal device performing voice services in a first cell, the first cell belongs to a first public land mobile network (PLMN), the first access network device is the access network device currently accessed by the terminal device, and the first measurement report is used to indicate that the signal strength of the first cell and the second cell meets the connectivity mobility event; the second cell belongs to a second PLMN network; processing unit 602 is further configured to instruct communication unit 601 to receive first indication information from the first access network device, the first indication information being used to instruct the terminal device to access a third cell; the third cell belongs to the first PLMN network; processing unit 602 is further configured to access the third cell in response to the first indication information.

[0177] Optionally, the processing unit 602 is specifically configured to: instruct the communication unit 601 to receive second instruction information from the first access network device; the second instruction information is used to instruct the terminal device to measure the signal strength of at least one cell in the first PLMN network; measure the signal strength of at least one cell, and determine that the cell whose signal strength meets the first preset condition among the at least one cells is the 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 the third cell.

[0178] 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 to indicate the fourth cell, the fourth cell is the cell in the second PLMN network whose signal strength meets the second preset condition; instruct the communication unit 601 to receive third indication information from the second access network device; the third indication information is used to instruct the terminal device to access the fourth cell; and in response to the third indication information, access the fourth cell.

[0179] Optionally, 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 and the signal strength of the second cell is higher than a second threshold; the signal strength of the first cell is lower than a third threshold.

[0180] Optionally, the third measurement report is a measurement report generated by measuring at least one cell in the second PLMN network after the terminal device completes the voice service.

[0181] Optionally, the second PLMN network is a PLMN network that does not have an interoperability interface configured with the first PLMN network.

[0182] Optionally, the first PLMN network is the home operator network of the terminal device; the second PLMN network is the roaming operator network of the terminal device.

[0183] Optionally, the first cell is a 5G cell in the home operator's network; the second cell is a 5G cell in the roaming operator's network; and the third cell is a 4G cell in the home operator's network.

[0184] Optionally, the fourth cell is the 5G cell of the roaming operator of the terminal device.

[0185] like Figure 7 The diagram shown is a structural schematic of a communication device provided in an embodiment of this application. The communication device includes a communication unit 701 and a processing unit 702.

[0186] Processing unit 702 is configured to instruct communication unit 701 to receive a first measurement report from a terminal device; wherein the terminal device is a terminal device performing voice services in a first cell, the first cell belongs to a first public land mobile network (PLMN), the communication device is a first access network device currently accessed by the terminal device, and the first measurement report is used to indicate that the signal strength of the first cell and the second cell meets the connectivity mobility event; the second cell belongs to a second PLMN network; processing unit 702 is further configured to generate first indication information based on the first measurement report; wherein 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; processing unit 702 is configured to instruct communication unit 701 to send the first indication information to the terminal device.

[0187] Optionally, the processing unit 702 is specifically configured to: generate 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; instruct the communication unit 701 to send the second indication 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 to indicate a third cell; and generate first indication information based on the second measurement report.

[0188] Optionally, 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 and the signal strength of the second cell is higher than a second threshold; the signal strength of the first cell is lower than a third threshold.

[0189] Optionally, the second PLMN network is a PLMN network that does not have an interoperability interface configured with the first PLMN network.

[0190] Optionally, the first PLMN network is the home operator network of the terminal device; the second PLMN network is the roaming operator network of the terminal device.

[0191] Optionally, the first cell is a fifth-generation 5G cell in the home operator's network; the second cell is a 5G cell in the roaming operator's network; and the third cell is a fourth-generation 4G cell in the home operator's network.

[0192] like Figure 8 The diagram shown is a structural schematic of a communication device provided in an embodiment of this application. The communication device includes a communication unit 801 and a processing unit 802.

[0193] The processing unit 802 is configured to instruct the communication unit 801 to receive a third measurement report from the terminal device; the third measurement report is used to indicate a fourth cell, which is a cell in the second PLMN network whose signal strength 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 based on the third measurement report; the third indication information is used to instruct the terminal device to access the fourth cell; the processing unit 802 is further configured to instruct the communication unit 801 to send the third indication information to the terminal device.

[0194] Optionally, the third measurement report is a measurement report generated by measuring at least one cell in the second PLMN network after the terminal device completes the voice service.

[0195] Optionally, the second PLMN network is the roaming operator network of the terminal device.

[0196] Optionally, the fourth cell is a 5G cell in the roaming operator's network.

[0197] Optionally, the communication device may further include a storage module for storing the program code and / or data of the communication device.

[0198] The processing units (e.g., processing unit 602, processing unit 702, processing unit 802) can be processors or controllers. They can implement or execute various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. The processor can also be a combination of functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc. The communication units (communication units 601, 701, 801) can be transceiver circuits or communication interfaces, etc. The storage module can 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 involved in the embodiments of this application can be... Figure 1 The communication device shown.

[0199] Through the above description of the implementation methods, those skilled in the art will clearly understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the network node can be divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, modules, and network nodes described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0200] This application also provides a computer-readable storage medium storing instructions. When a computer executes these instructions, the computer performs each step of the method flow shown in the above method embodiments.

[0201] This application also provides a chip, which includes a processor and a communication interface. The communication interface and the processor are coupled. The processor is used to run computer programs or instructions to implement the communication method in the above method embodiments.

[0202] Embodiments of this application provide a computer program product containing instructions that, when executed on a computer, cause the computer to perform the communication method described in the above method embodiments.

[0203] The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), registers, hard disks, optical fibers, compact disc read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing, or any other form of computer-readable storage medium in the art. An exemplary storage medium is coupled to a processor, enabling the processor to read information from and write information to the storage medium. Of course, the storage medium may also be a component of the processor. The processor and the storage medium may reside in an application-specific integrated circuit (ASIC). In embodiments of the present invention, a computer-readable storage medium may be any tangible medium that contains or stores a program that may be used by or in conjunction with an instruction execution system, apparatus, or device.

[0204] Since the apparatus, device, computer-readable storage medium, and computer program product in the embodiments of the present invention can be applied to the above methods, the technical effects that can be obtained can also be referred to the above method embodiments. The embodiments of this application will not be repeated here.

[0205] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A communication method, characterized in that, include: A terminal device sends a first measurement report to a first access network device; wherein, the terminal device is a terminal device performing voice services in a first cell, the first cell belongs to a first public land mobile network (PLMN), the first PLMN is the home operator network of the terminal device, and the first cell is a 5G cell in the home operator network; the first access network device is the access network device currently accessed by the terminal device, and the first measurement report is used to indicate that the signal strength of the first cell and the second cell meets the connected mobility event; the second cell belongs to a second PLMN network; the second PLMN is the roaming operator network of the terminal device, the second cell is a 5G cell in the roaming operator network, and the second PLMN is a PLMN network that does not have an interoperability interface configured with the first PLMN network; the terminal device receives first indication information from the first access network device, the first indication information is used to indicate that the terminal device accesses a third cell; the third cell belongs to the first PLMN network, and the third cell is a 4G cell in the home operator network. In response to the first indication information, the terminal device accesses the third cell.

2. The method according to claim 1, characterized in that, Before the terminal device receives the first indication information from the first access network device, the method further includes: The terminal device receives second indication information from the first access network device; 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. The terminal device measures the signal strength of the at least one cell and determines the cell whose signal strength meets the first preset condition as the third cell. The terminal device sends a second measurement report to the first access network device; 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 accesses the third cell, the method further includes: The terminal device sends 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 to indicate the fourth cell, which is a cell in the second PLMN network whose signal strength meets the second preset condition; The terminal device receives third indication information from the second access network device; the third indication information is used to instruct the terminal device to access the fourth cell; In response to the third indication information, the terminal device accesses the fourth cell.

4. The method according to claim 1 or 2, characterized in that, 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 the first threshold, and the signal strength of the second cell is higher than the second threshold; The signal strength of the first cell is lower than the third threshold.

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

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

7. A communication method, characterized in that, include: A first access network device receives a first measurement report from a terminal device; wherein the terminal device is a terminal device performing voice services in a first cell, the first cell belongs to a first public land mobile network (PLMN), the first PLMN is the home operator network of the terminal device, and the first cell is a fifth-generation 5G cell in the home operator network; the first access network device is the access network device currently accessed by the terminal device, and the first measurement report is used to indicate that the signal strength of the first cell and the second cell meets the connected mobility event; the second cell belongs to a second PLMN; the second PLMN is the roaming operator network of the terminal device, the second cell is a 5G cell in the roaming operator network, and the second PLMN is a PLMN network that does not have an interoperability interface configured with the first PLMN; the first access network device generates first indication information based on the first measurement report; wherein the first indication information is used to instruct the terminal device to access a third cell; the third cell belongs to the first PLMN and is a fourth-generation 4G cell in the home operator network. The first access network device sends a first instruction message to the terminal device.

8. The method according to claim 7, characterized in that, Before the first access network device sends the first indication information to the terminal device, the method further includes: The first access network device 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. The first access network device sends the second indication information to the terminal device; The first access network device receives a second measurement report from the terminal device; the second measurement report is used to indicate the third cell; The first access network device generates the first indication information based on the second measurement report.

9. The method according to claim 7 or 8, characterized in that, 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 the first threshold, and the signal strength of the second cell is higher than the second threshold; The signal strength of the first cell is lower than the third threshold.

10. A communication method, characterized in that, include: The second access network device receives a third measurement report from the terminal device; The second access network device is an access network device corresponding to the third cell in the first PLMN network, the first PLMN network is the home operator network of the terminal device, and the third cell is a fourth-generation 4G cell in the home operator network; the terminal device is a terminal device that has moved from the first cell in the first PLMN to the third cell and is currently performing voice service; the first cell is a fifth-generation 5G cell in the home operator network; the first cell corresponds to the first access network device, which is the access network device that the terminal device accessed before accessing the second access network device; the third measurement report is used to indicate the fourth cell, which is a cell in the second PLMN network whose signal strength meets the second preset condition; the second PLMN network is the roaming operator network of the terminal device, the second PLMN network is a PLMN network that does not have an interoperability interface configured with the first PLMN network, and the fourth cell is a 5G cell in the roaming operator network; The second access network device generates third indication information based on the third measurement report; The third indication information is used to instruct the terminal device to access the fourth cell; The second access network device sends the third instruction information to the terminal device.

11. The method according to claim 10, characterized in that, The third measurement report is a measurement report generated by the terminal device after completing the voice service, measuring at least one cell in the second PLMN network.

12. A communication device, characterized in that, include: Processing unit and communication unit; The processing unit is configured to instruct the communication unit to send a first measurement report to the first access network device; wherein, the communication device is a terminal device performing voice services in a first cell, the first cell belongs to a first public land mobile network (PLMN), the first PLMN is the home operator network of the terminal device, and the first cell is a 5G cell in the home operator network; the first access network device is the access network device currently accessed by the terminal device, and the first measurement report is used to indicate that the signal strength of the first cell and the second cell meets the connectivity mobility event. The second cell belongs to a second PLMN network; the second PLMN network is the roaming operator network of the terminal device, and the second cell is a 5G cell in the roaming operator network; the second PLMN network is a PLMN network that does not have an interoperability interface configured with the first PLMN network; the processing unit is further configured to instruct the communication unit to receive first indication information from the first access network device, the first indication information being used to instruct the terminal device to access a third cell; the third cell belongs to the first PLMN network, and the third cell is a 4G cell in the home operator network; The processing unit is also configured to access the third cell in response to the first indication information.

13. The apparatus according to claim 12, characterized in that, The processing unit is specifically used for: The communication unit is instructed to receive second indication information from the first access network device; 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. Measure the signal strength of the at least one cell, and determine the cell whose signal strength meets the first preset condition as the third cell; The communication unit is instructed to send a second measurement report to the first access network device; the second measurement report is used to indicate the third cell.

14. The apparatus according to claim 12 or 13, characterized in that, The processing unit is specifically used for: The communication unit is instructed 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 to indicate the fourth cell, which is a cell in the second PLMN network whose signal strength meets the second preset condition; The communication unit is instructed to receive third indication information from the second access network device; The third indication information is used to instruct the terminal device to access the fourth cell; In response to the third indication information, access is made to the fourth cell.

15. The apparatus according to claim 12 or 13, characterized in that, 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 the first threshold, and the signal strength of the second cell is higher than the second threshold; The signal strength of the first cell is lower than the third threshold.

16. The apparatus according to claim 14, characterized in that, The third measurement report is a measurement report generated by the terminal device after completing the voice service, measuring at least one cell in the second PLMN network.

17. The apparatus according to claim 14, characterized in that, The fourth cell is the 5G cell of the roaming operator of the terminal device.

18. A communication device, characterized in that, include: Processing unit and communication unit; The processing unit is configured to instruct the communication unit to receive a first measurement report from the terminal device; wherein the terminal device is a terminal device performing voice services in a first cell, the first cell belongs to a first public land mobile network (PLMN), the first PLMN is the home operator network of the terminal device, and the first cell is a fifth-generation 5G cell in the home operator network; the communication device is a first access network device currently accessed by the terminal device, and the first measurement report is used to indicate that the signal strength of the first cell and the second cell meets the connected mobility event; the second cell belongs to a second PLMN; the second PLMN is the roaming operator network of the terminal device, and the second cell is a 5G cell in the roaming operator network; the second PLMN is a PLMN network that does not have an interoperability interface configured with the first PLMN; the processing unit is further configured to generate first indication information based on the first measurement report; wherein the first indication information is used to instruct the terminal device to access a third cell; the third cell belongs to the first PLMN and is a fourth-generation 4G cell in the home operator network. The processing unit is used to instruct the communication unit to send first instruction information to the terminal device.

19. The apparatus according to claim 18, characterized in that, The processing unit is specifically used for: Generate 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; The communication unit is instructed to send the second instruction information to the terminal device; The communication unit is instructed to receive a second measurement report from the terminal device; the second measurement report is used to indicate the third cell; The first indication information is generated based on the second measurement report.

20. The apparatus according to claim 18 or 19, characterized in that, 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 the first threshold, and the signal strength of the second cell is higher than the second threshold; The signal strength of the first cell is lower than the third threshold.

21. A communication device, characterized in that, include: Processing unit and communication unit; The processing unit is used to instruct the communication unit to receive a third measurement report from the terminal device; the communication device is a second access network device corresponding to the third cell; the third cell belongs to the first PLMN network; The first PLMN network is the home operator network of the terminal device, and the third cell is a fourth-generation 4G cell in the home operator network; the terminal device is a terminal device that has moved from the first cell in the first PLMN to the third cell and is currently performing voice service; the first cell is a fifth-generation 5G cell in the home operator network; the first cell corresponds to a first access network device, which is the access network device that the terminal device accessed before accessing the second access network device; the third measurement report is used to indicate the fourth cell, which is a cell in the second PLMN network whose signal strength meets the second preset condition; the second PLMN network is the roaming operator network of the terminal device, and the second PLMN network is a PLMN network that does not have an interoperability interface configured with the first PLMN network; the fourth cell is a 5G cell in the roaming operator network. The processing unit is further configured to generate third indication information based on the third measurement report; the third indication information is used to instruct the terminal device 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.

22. The apparatus according to claim 21, characterized in that, The third measurement report is a measurement report generated by the terminal device after completing the voice service, measuring at least one cell in the second PLMN network.

23. An electronic device, characterized in that, include: A processor and a memory; wherein the memory is used to store computer execution instructions, and when the electronic device is running, the processor executes the computer execution instructions stored in the memory to cause the electronic device to perform the communication method according to any one of claims 1-11.

24. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes instructions that, when executed by an electronic device, cause the computer to perform the communication method as described in any one of claims 1-11.

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