Indication information sending method, network equipment, communication device and core network equipment

Abstract

The present application discloses a method for sending indication information, a network device, a communication apparatus, and a core network apparatus, relating to the field of communications, and is used to control a terminal device that supports both CAG access and PLMN access to access a CAG cell or a PLMN cell. A first network device includes: a transceiver module for receiving first indication information, wherein the first indication information is used to instruct a communication device to configure second indication information, wherein the second indication information is used to instruct the communication device to access the system only through a closed access group (CAG) cell or only through a public land mobile network (PLMN) cell; and the transceiver module is further used to send second indication information to the communication device in response to the first indication information.

Description

Technical Field

[0001] The present application relates to the field of communications, and in particular to a method for sending indication information, network equipment, a communication device, and core network equipment. Background Art

[0002] Based on the contract information between the enterprise and the operator, the operator can only provide non-public network (NPN) services to the enterprise within certain specific areas (such as the coverage area of the factory park). Closed access group (CAG) cells and public land mobile network (PLMN) cells can be divided into slicing. Among them, CAG cells provide terminal equipment belonging to the NPN (NPN-UE) to access the system, and PLMN cells provide terminal equipment not belonging to the NPN (non-NPN-UE) to access the system.

[0003] For terminal devices that support accessing the system through CAG cells or through PLMN cells at the same time, if they can be covered by CAG cells and PLMN cells at the same time, the access of the terminal device will not be restricted. For example, the terminal device can access the system through both CAG cells and PLMN cells, which will affect the security of NPN services. Summary of the Invention

[0004] The embodiments of the present application provide an indication information sending method, a network device, a communication apparatus, and a core network device, which are used to control a terminal device that supports both CAG access and PLMN access to access a CAG cell or a PLMN cell.

[0005] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0006] In a first aspect, a method for sending indication information is provided, including: a first network device receiving first indication information, wherein the first indication information is used to instruct a terminal device to configure second indication information, the second indication information being used to instruct the terminal device to access a system only through a closed access group (CAG) cell or only through a public land mobile network (PLMN) cell. In response to the first indication information, the first network device sends the second indication information to the terminal device.

[0007] In an embodiment of the present application, a method for sending indication information is provided, in which a first network device receives first indication information, wherein the first indication information is used to indicate whether to configure second indication information for the terminal device, and the second indication information indicates that the terminal device accesses the system only through a CAG cell, or only through a PLMN cell. In response to the first indication information, the first network device sends second indication information to the terminal device, so that the terminal device can access the system through the CAG cell or through the PLMN cell in response to the second indication information. The first network device restricts access to a terminal device that supports both CAG access and PLMN access, thereby controlling the terminal device's access to the CAG cell or the PLMN cell.

[0008] In a possible implementation, the first network device receiving the first indication information includes: the first network device receiving the first indication information from the terminal device, that is, the terminal device actively requests configuration of the second indication information.

[0009] In a possible implementation manner, the first network device receiving the first indication information includes: the first network device receiving the first indication information from a second network device. The second network device may be a last serving network device.

[0010] In a possible implementation, the first network device receiving the first indication information includes: the first network device receiving the first indication information from the core network device, that is, the core network device actively instructs the network device to configure the second indication information for the terminal device.

[0011] In one possible implementation, the method further includes: the first network device determining the second indication information based on a measurement report from the terminal device, or based on the measurement report and an allowed CAG list, wherein the measurement report includes at least an identifier of a serving cell and an identifier and measurement result of a neighboring cell; and the allowed CAG list includes identifiers of CAG cells that the terminal device is allowed to access. That is, the network device may determine the second indication information based on the measurement report of the terminal device.

[0012] In one possible implementation, the first network device determines the second indication information based on a measurement report from the terminal device, or the measurement report and an allowed CAG list, including: the first network device determines that the serving cell is a PLMN cell based on an identifier of the serving cell; the first network device determines that the neighboring cells include at least one CAG cell based on identifiers of neighboring cells; the first network device determines that the second indication information instructs the terminal device to access the system only through the CAG cell based on a measurement result of at least one CAG cell being higher than a first threshold and the identifier of at least one CAG cell being in the allowed CAG list. When the terminal device switches from a PLMN cell to a CAG cell, the communication quality of the CAG cell is required to meet communication requirements, and the identifier of the CAG cell must be in the allowed CAG list.

[0013] In one possible implementation, the measurement report also includes a measurement result of the serving cell. The first network device determines the second indication information based on the measurement report from the terminal device, or the measurement report and the allowed CAG list, including: the first network device determines that the serving cell is a CAG cell based on an identifier of the serving cell; the first network device determines that the neighboring cells include only PLMN cells based on identifiers of neighboring cells; and the first network device determines, based on the measurement result of the PLMN cell being greater than a second threshold and the measurement result of the serving cell being less than a third threshold, that the second indication information instructs the terminal device to access the system only through the PLMN cell. When the terminal device switches from a CAG cell to a PLMN cell, the conditions are relatively stringent, requiring not only poor communication quality of the CAG cell but also good communication quality of the PLMN cell.

[0014] In a possible implementation, in the first network device, the first indication information is stored in the context of the terminal device.

[0015] In a possible implementation, when the terminal device is in an inactive state, the first indication information is stored in an inactive access layer context of the terminal device. When the terminal device is in different states, the storage location of the first indication information is different.

[0016] In a possible implementation, when the terminal device is in a connected state, the first indication information is stored in an access layer context of the terminal device. When the terminal device is in different states, the storage location of the first indication information is different.

[0017] In a second aspect, a method for sending indication information is provided, including: receiving second indication information from a first network device, the second indication information being used to instruct the terminal device to access the system only through a CAG cell or only through a PLMN cell; and in response to the second indication information, accessing the system through a CAG cell or through a PLMN cell.

[0018] In an embodiment of the present application, a method for sending indication information is provided, in which a first network device receives first indication information, wherein the first indication information is used to indicate whether to configure second indication information for the terminal device, and the second indication information indicates that the terminal device accesses the system only through a CAG cell, or only through a PLMN cell. In response to the first indication information, the first network device sends second indication information to the terminal device, so that the terminal device can access the system through the CAG cell or through the PLMN cell in response to the second indication information. The first network device restricts access to a terminal device that supports both CAG access and PLMN access, thereby controlling the terminal device's access to the CAG cell or the PLMN cell.

[0019] In a possible implementation, the method further includes: sending first indication information to the first network device, wherein the first indication information is used to instruct the terminal device to configure second indication information, that is, the terminal device actively requests to configure the second indication information.

[0020] In one possible implementation, the method further includes: sending a measurement report to the first network device, wherein the measurement report includes at least an identifier of a serving cell and identifiers and measurement results of neighboring cells, wherein the serving cell is a PLMN cell and the neighboring cells include at least one CAG cell, or wherein the serving cell is a CAG cell and the neighboring cells include only PLMN cells. The measurement report may be used by the network device to determine the second indication information.

[0021] In a possible implementation, the measurement report further includes a measurement result of the serving cell.

[0022] In a possible implementation, the first indication information is stored in the context of the terminal device.

[0023] In a possible implementation, when the terminal device is in an inactive state, the first indication information is stored in an inactive access layer context of the terminal device. When the terminal device is in different states, the storage location of the first indication information is different.

[0024] In a possible implementation, when the terminal device is in a connected state, the first indication information is stored in an access layer context of the terminal device. When the terminal device is in different states, the storage location of the first indication information is different.

[0025] According to a third aspect, a method for sending indication information is provided, including: a core network device determines first indication information, wherein the first indication information is used to indicate that second indication information is configured for a terminal device, and the second indication information is used to indicate that the terminal device accesses the system only through a closed access group CAG cell or only through a public land mobile network PLMN cell; the core network device sends the first indication information to the first network device.

[0026] In the method for sending indication information provided in an embodiment of the present application, a core network device proactively instructs a network device to configure second indication information for a terminal device. This allows the terminal device to access the system via a CAG cell or a PLMN cell in response to the second indication information. A first network device restricts access to a terminal device that supports both CAG and PLMN access, thereby controlling the terminal device's access to either the CAG cell or the PLMN cell.

[0027] In a fourth aspect, a first network device is provided, including: a transceiver module for receiving first indication information, wherein the first indication information is used to indicate that second indication information is configured for the terminal device, and the second indication information is used to indicate that the terminal device accesses the system only through a closed access group CAG cell or only through a public land mobile network PLMN cell; the transceiver module is also used to send second indication information to the terminal device in response to the first indication information.

[0028] In a possible implementation, the transceiver module is specifically configured to receive first indication information from a terminal device.

[0029] In a possible implementation manner, the transceiver module is specifically configured to receive first indication information from the second network device.

[0030] In a possible implementation, the transceiver module is specifically configured to receive first indication information from a core network device.

[0031] In one possible embodiment, the first network device also includes a processing module for determining the second indication information based on a measurement report from the terminal device, or a measurement report and an allowed CAG list, wherein the measurement report includes at least an identifier of the serving cell, and an identifier and a measurement result of a neighbor cell; and the allowed CAG list includes identifiers of CAG cells that the terminal device is allowed to access.

[0032] In one possible implementation, the processing module is specifically used to: determine that the serving cell is a PLMN cell based on the identifier of the serving cell; determine that the neighboring cells include at least one CAG cell based on the identifier of the neighboring cell; and determine that the second indication information indicates that the terminal device accesses the system only through the CAG cell based on the measurement result of at least one CAG cell being higher than the first threshold and the identifier of at least one CAG cell belonging to the allowed CAG list.

[0033] In one possible implementation, the measurement report also includes the measurement results of the serving cell, and the processing module is specifically used to: determine that the serving cell is a CAG cell based on the identifier of the serving cell; determine that the neighboring cells only include PLMN cells based on the identifier of the neighboring cells; and determine that the second indication information indicates that the terminal device accesses the system only through the PLMN cell based on the measurement result of the PLMN cell being higher than the second threshold and the measurement result of the serving cell being lower than the third threshold.

[0034] In a possible implementation, in the first network device, the first indication information is stored in the context of the terminal device.

[0035] In a possible implementation, when the terminal device is in an inactive state, the first indication information is stored in an inactive access layer context of the terminal device.

[0036] In a possible implementation, when the terminal device is in a connected state, the first indication information is stored in an access layer context of the terminal device.

[0037] In the fifth aspect, a terminal device is provided, including: a transceiver module for receiving second indication information from a first network device, the second indication information being used to indicate that the terminal device accesses the system only through a CAG cell or only through a PLMN cell; a processing module for accessing the system through a CAG cell or through a PLMN cell in response to the second indication information.

[0038] In a possible implementation, the transceiver module is further used to: send first indication information to the first network device, wherein the first indication information is used to indicate configuration of second indication information for the terminal device.

[0039] In one possible implementation, the transceiver module is further used to: send a measurement report to the first network device, wherein the measurement report includes at least an identifier of the serving cell, and an identifier and measurement result of a neighboring cell, the serving cell is a PLMN cell, and the neighboring cell includes at least one CAG cell, or the serving cell is a CAG cell and the neighboring cell includes only a PLMN cell.

[0040] In a possible implementation, the measurement report further includes a measurement result of the serving cell.

[0041] In a possible implementation, the first indication information is stored in the context of the terminal device.

[0042] In a possible implementation, when the terminal device is in an inactive state, the first indication information is stored in an inactive access layer context of the terminal device.

[0043] In a possible implementation, when the terminal device is in a connected state, the first indication information is stored in an access layer context of the terminal device.

[0044] In the sixth aspect, a core network device is provided, including: a processing module for determining first indication information, wherein the first indication information is used to indicate that second indication information is configured for the terminal device, and the second indication information is used to indicate that the terminal device accesses the system only through a closed access group CAG cell or only through a public land mobile network PLMN cell; a transceiver module for sending the first indication information to the first network device.

[0045] In the seventh aspect, a communication device is provided, comprising a processor connected to a memory, the memory being used to store a computer program, and the processor being used to execute the computer program stored in the memory so that the device executes the method described in the first aspect and any one of its embodiments.

[0046] In an eighth aspect, a communication device is provided, comprising a processor connected to a memory, the memory being used to store a computer program, and the processor being used to execute the computer program stored in the memory so that the device performs the method described in the second aspect and any one of its embodiments.

[0047] In the ninth aspect, a communication device is provided, comprising a processor connected to a memory, the memory being used to store a computer program, and the processor being used to execute the computer program stored in the memory so that the device performs the method described in the third aspect and any one of its embodiments.

[0048] In a tenth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed, the method as described in the first aspect and any one of its embodiments is implemented.

[0049] In the eleventh aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed, the method as described in the second aspect and any one of its embodiments is implemented.

[0050] In the twelfth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed, the method as described in the third aspect and any one of its embodiments is implemented.

[0051] In the thirteenth aspect, a communication system is provided, comprising the first network device as described in the fourth aspect and any one of the items, the terminal device as described in the fifth aspect and any one of the items, and the core network device as described in the sixth aspect and any one of the items.

[0052] The technical effects of the fourth to thirteenth aspects refer to the contents of the first to third aspects and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 A schematic diagram of the architecture of a communication system provided in an embodiment of the present application;

[0054] Figure 2 A schematic diagram of a method for sending an indication message provided in an embodiment of the present application Figure 1 ;

[0055] Figure 3 A schematic diagram of a method for sending an indication message provided in an embodiment of the present application Figure 2 ;

[0056] Figure 4 A schematic diagram of a method for sending an indication message provided in an embodiment of the present application Figure 3 ;

[0057] Figure 5 A schematic diagram of a method for sending an indication message provided in an embodiment of the present application Figure 4 ;

[0058] Figure 6 A schematic diagram of a method for sending an indication message provided in an embodiment of the present application Figure 5 ;

[0059] Figure 7 A schematic diagram of a method for sending an indication message provided in an embodiment of the present application Figure 6 ;

[0060] Figure 8 A schematic diagram of a method for sending an indication message provided in an embodiment of the present application Figure 7 ;

[0061] Figure 9 A schematic diagram of the structure of a first network device provided in an embodiment of the present application Figure 1 ;

[0062] Figure 10 A schematic diagram of the structure of a first network device provided in an embodiment of the present application Figure 2 ;

[0063] Figure 11 A schematic diagram of the structure of a terminal device provided in an embodiment of the present application Figure 1 ;

[0064] Figure 12 A schematic diagram of the structure of a terminal device provided in an embodiment of the present application Figure 2 ;

[0065] Figure 13 A schematic diagram of the structure of a core network device provided in an embodiment of the present application Figure 1 ;

[0066] Figure 14 A schematic diagram of the structure of a core network device provided in an embodiment of the present application Figure 2 ;

[0067] Figure 15 A schematic structural diagram of a communication device provided in an embodiment of the present application;

[0068] Figure 16 A schematic structural diagram of another communication device provided in an embodiment of the present application;

[0069] Figure 17 A structural diagram of another communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0070] The technical solution in this application will be described below with reference to the accompanying drawings.

[0071] It should be understood that the technical solutions of the embodiments of the present application can be applied to the long term evolution (LTE) architecture, and can also be applied to the universal mobile telecommunications system (UMTS) terrestrial radio access network (UTRAN) architecture, or the global system for mobile communication (GSM) / enhanced data rate for GSM evolution (EDGE) system radio access network (GSM EDGE radio access network, GERAN) architecture. In the UTRAN architecture or the GERAN architecture, the functions of the MME are performed by the serving general packet radio service (GPRS) support node (SGSN), and the functions of the SGW\PGW are performed by the gateway GPRS support node (GGSN). The technical solutions of the embodiments of the present application can also be applied to other communication systems, such as public land mobile network (PLMN) systems, and even future fifth generation (5G) communication systems or communication systems after 5G, etc., and the embodiments of the present application are not limited to this.

[0072] The embodiments of the present application relate to terminal devices. The terminal device may be a device that includes wireless transceiver functions and can cooperate with network devices to provide communication services to users. Specifically, the terminal device may refer to user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device. For example, the terminal device may be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a robot, a drone, an intelligent driving vehicle, a household appliance, an on-board device, a medical device, an intelligent logistics device, a wearable device, a terminal device in a future 5G network or a network after 5G, etc., and the embodiments of the present application are not limited to this.

[0073] The network devices involved in the embodiments of the present application may also be referred to as radio access network (RAN) devices. The RAN device is connected to the terminal device, and is used to receive data from the terminal device and send it to the core network device. The RAN device corresponds to different devices in different communication systems, for example, in the 2G system, it corresponds to the base station and the base station controller, in the 3G system, it corresponds to the base station and the radio network controller (RNC), in the 4G system, it corresponds to the evolved base station (evolutionary node B, eNB), and in the 5G system, it corresponds to the 5G system, such as the access network device (such as gNB, CU, DU) in the new radio access technology (NR). Alternatively, the network device can be a relay station, an access point, an on-board device, a wearable device, a network-side device in a future 5G network or a network after 5G, or a network device in a future evolved PLMN network, etc.

[0074] The embodiments of the present application also relate to core network (CN) devices. CN devices correspond to different devices in different communication systems, for example, in 3G systems, they correspond to serving GPRS support nodes (SGSN) or gateway GPRS support nodes (GGSN), in 4G systems, they correspond to mobility management entities (MME) or serving gateways (S-GW), and in 5G systems, they correspond to core network-related devices of the 5G system (e.g., NG-Core).

[0075] To facilitate understanding of this application, the following concepts are first introduced:

[0076] In the Connected state, a radio resource control (RRC) connection is established between the terminal device and the RAN equipment. A connection is also established between the terminal device and the core network equipment. Any data transmission can be completed directly through the established connection. While the terminal device is in the Connected state, the RAN equipment stores the terminal device's context information and can perform cell handovers based on RAN device control.

[0077] In the idle state, there is no RRC connection between the terminal device and the RAN device, and the connection with the core network device is not established. If data needs to be transmitted, connections with the RAN and core network devices must be established first. When the terminal device is in the idle state, the RAN device releases the terminal device's context information, and the terminal device can perform cell-based reselection.

[0078] The inactive state may also be called a light connection state, a suspended state, a deactivated state, a low-overhead state, etc.

[0079] When the terminal device is in an inactive state, the RRC connection between the terminal device and the RAN device can be restored through a resume message. In addition, the data radio bearer (DRB) for transmitting data between the terminal device and the RAN device can also be restored. The S1 interface of the terminal device will be anchored to a RAN device (which can be called an anchor RAN device), and then cell reselection mobility can be performed. When moving within a predetermined area (such as a "RAN-based notification area" or a "radio access network area"), there is no need to notify the anchor RAN device. Once it leaves the RAN-based notification area (RAN-based notification area, RNA), it is necessary to notify the anchor RAN device of its location. This process is called a RAN-based notification area update. The "inactive state" mentioned in the embodiments of the present application is only used to describe this state, and is not a limitation.

[0080] In the inactive state, a terminal device can perform cell-based reselection operations. Meanwhile, the terminal device's connection information, including its context and core network connection, is stored in the anchor RAN device. While in the inactive state, the terminal device stores management area information configured by the anchor RAN device. The terminal device must notify the anchor RAN device when it moves out of the management area corresponding to this management area information.

[0081] Context information: After the RAN device establishes an RRC connection with the terminal device, the RAN device saves the context information of the terminal device, and the RAN device and the terminal device communicate based on the context information.

[0082] Specifically, the context information includes identification information of the terminal device, security context information of the terminal device, subscription information of the terminal device, configuration information of the wireless bearer of the terminal device, logical channel information and network slicing information.

[0083] The identifier of the terminal device refers to an identifier that can uniquely identify the terminal device, which can be an identifier assigned to the terminal device by the RAN device or an identifier assigned to the terminal device by the core network device.

[0084] Figure 1 This is a schematic diagram of the architecture of a communication system according to an embodiment of the present application, including: a terminal device 101, a network device 102, and a core network device 103.

[0085] The terminal device 101 is connected to the network device 102 via a wireless connection, the network devices 102 are connected to each other via an Xn interface, and the network device 102 is connected to the core network device 103 via an NG interface.

[0086] The network device 102 may also be referred to as a next generation radio access network (NG-RAN), where the NG-RAN includes a gNB and a next generation evolutionary node B (ng-eNB).

[0087] The ng-eNB may communicate directly with the terminal device 101 to provide E-UTRA user plane and control plane connectivity for the terminal device 101. The gNB may communicate indirectly with the terminal device 101 (e.g., via the ng-eNB) to provide NR user plane and control plane connectivity for the terminal device 101.

[0088] The core network device 103 can be called a 5G core network (5GC), and can include an access and mobility management function (AMF) device for mobility management in a mobile network, such as user location update, user registration network, user switching, etc.

[0089] After the terminal device 101 initially establishes an RRC connection with the network device 102, the terminal device 101 enters the connected state. In the connected state, the network device 102 stores the context information of the terminal device 101, and the terminal device 101 communicates with the network device 102 based on the RRC connection, for example, accessing the core network device 103 through the network device 102.

[0090] Then, the terminal device 101 can disconnect the RRC connection with the network device 102, or the network device 102 can disconnect the RRC connection with the terminal device 101, but the network device 102 retains the context information of the terminal device 101, and the terminal device 101 enters an inactive state.

[0091] Based on the above communication system architecture, operators can build non-public networks (NPNs) for enterprises and provide NPN services. As the name suggests, NPNs are networks that provide services to specific users, different from public networks. 3GPP protocol TS23.501 defines non-public networks as follows:

[0092] 1) Standalone NPN: This network does not rely on the PLMN network and is operated by the SNPN operator.

[0093] 2) Public network integrated NPN (NPN), which is a non-standalone network and relies on the PLMN network and is operated by traditional operators.

[0094] In the embodiment of the present application, the NPN established based on the above communication system architecture belongs to a non-independent networking NPN.

[0095] As mentioned above, to support NPN, CAG cells can be divided into slices. CAG cells are used for terminal devices (NPN-UE) belonging to the NPN to access the system and provide NPN services. The remaining PLMN cells are used for terminal devices (non-NPN-UE) not belonging to the NPN to access the system and provide PLMN services.

[0096] It should be noted that, in the embodiment of the present application, the NPN service may also be referred to as the CAG service, and the following description will be based on the CAG service.

[0097] In order to control the terminal device's access to the system through the CAG cell, the following CAG information can be configured for the terminal device:

[0098] 1) Allowed CAG list: includes the identifiers (CAG IDs) of the CAG cells that the terminal device is allowed to access. The CAG ID is used to uniquely identify the CAG cell within the PLMN ID. Each PLMN can have multiple CAG IDs, and each cell can support multiple PLMNs. Therefore, when the cell broadcasts, it will broadcast all supported PLMNs and the CAGID corresponding to each PLMN.

[0099] 2) CAG-only indication (optional): whether the terminal device is only allowed to access the system through the CAG cell.

[0100] Based on the above CAG information, the access restrictions for terminal devices in CAG cells and PLMN cells are shown in Table 1:

[0101] Table 1

[0102]

[0103]

[0104] A CAG-only cell, also known as a CAG cell, can only provide CAG services to terminal devices. A PLMN-only cell, also known as a PLMN cell, can only provide PLMN services to terminal devices. A CAG and PLMN cell (CAG+PLMN cell) can provide both CAG and PLMN services to terminal devices.

[0105] A CAG-only UE is a UE with a non-empty allowed CAG list and configured with CAG-only indication. A PLMN-only UE is a UE with an empty allowed CAG list or no allowed CAG list configured and no CAG-only indication configured. A CAG and PLMN UE is a UE with a non-empty allowed CAG list and no CAG-only indication configured.

[0106] For CAG and PLMN terminal devices, if the terminal device is configured with CAG-only indication information, the terminal device can only access the system through CAG cells and cannot access the system through PLMN cells. If the terminal device is not configured with CAG-only indication information and the CAG list is allowed to be non-empty, the terminal device can access the system through both CAG cells and PLMN cells.

[0107] As mentioned above, for terminal devices that support accessing the system through CAG cells or through PLMN cells at the same time, if they can be covered by CAG cells and PLMN cells at the same time, the access of the terminal device will not be restricted. For example, the terminal device can access the system through both CAG cells and PLMN cells, which will affect the security of NPN services.

[0108] In an embodiment of the present application, a method for sending indication information is provided. A first network device can receive first indication information from a core network device, a second network device, and a terminal device. The first indication information indicates whether second indication information needs to be configured for the terminal device. In response to the first indication information, the first network device sends second indication information to the terminal device. The second indication information instructs the terminal device to access the system only through CAG cells or only through PLMN cells. This solves the aforementioned problem.

[0109] Figure 2 A flowchart of a method for sending indication information provided in an embodiment of the present application. Figure 2The terminal device, network device (first network device and second network device), and core network device described in the embodiment may correspond to Figure 1 The terminal device 101, network device 102, and core network device 103 shown in FIG. Figure 2 As shown, the method for sending indication information includes S201-S203:

[0110] S201: A first network device receives first indication information.

[0111] Among them, the first indication information is used to indicate whether the second indication information is configured for the terminal device. The first indication information can be a type of terminal device newly defined in the context of the terminal device (such as UE context). Exemplarily, the first indication information can occupy 1 bit, and when the value is 1 (TRUE), it indicates that the second indication information needs to be configured for the terminal device, and when the value is 0 (FALSE), it indicates that the second indication information does not need to be configured for the terminal device. Alternatively, when the value is 0 (FALSE), it indicates that the second indication information needs to be configured for the terminal device, and when the value is 1 (TRUE), it indicates that the second indication information does not need to be configured for the terminal device.

[0112] The terminal device supports accessing the system through a CAG cell and accessing the system through a PLMN cell. Accordingly, the type of cell that the terminal device attempts to access can be a CAG cell or a PLMN cell. Exemplarily, the system can be a 5G system.

[0113] The second indication information is used to instruct the terminal device to access the system only through the CAG cell or to access the system only through the PLMN cell. Exemplarily, the second indication information can be defined as a temporary CAG-only indication, which indicates that the terminal device can access the system only through the CAG cell when the value is TRUE, and indicates that the terminal device can access the system only through the PLMN cell when the value is FALSE. It should be noted that if the first network device does not configure the second indication information to the terminal device, it can be equivalent to taking the value FALSE, that is, it is equivalent to the second indication information instructing the terminal device to access the system only through the PLMN cell.

[0114] In the first network device, the first indication information may be stored in a context of the terminal device. When the terminal device is in an inactive state, the first indication information is stored in an inactive access stratum context (UE INACTIVEAS context) of the terminal device. When the terminal device is in a connected state, the first indication information is stored in an access stratum context (UE AS context) of the terminal device.

[0115] The first network device may receive the first indication information in at least one of the following ways:

[0116] In a possible implementation, a core network device (e.g., an AMF device) may determine the first indication information and send the first indication information to the first network device. Accordingly, the first network device may obtain the first indication information from the core network device. The first indication information may be stored in the context of the terminal device in the core network device, and the core network device may determine the first indication information based on the context of the terminal device and send it to the first network device. For example, for an idle terminal device, in the RRC connection establishment process, the core network device may carry the first indication information in an initial context setup request message sent to the first network device, so that the first network device obtains the first indication information.

[0117] In another possible implementation, the terminal device may send first indication information to the first network device, and accordingly, the first network device may receive the first indication information from the terminal device. For example, for a terminal device in an idle state, in the RRC connection establishment process, the terminal device may carry the first indication information in an RRC setup request (RRC setup request) message sent to the first network device; or, for a terminal device in an inactive state, in the RRC connection recovery process, the terminal device may carry the first indication information in an RRC resume request (RRC resume request) message sent to the first network device, so that the first network device obtains the first indication information. That is, the terminal device actively triggers the first network device to configure the second indication information for the terminal device by sending the first indication information to the first network device.

[0118] In the terminal device, the first indication information may be stored in a context of the terminal device. When the terminal device is in an inactive state, the first indication information is stored in an inactive access stratum context (UE INACTIVE AS context) of the terminal device. When the terminal device is in a connected state, the first indication information is stored in an access stratum context (UE AS context) of the terminal device.

[0119] In another possible implementation, the first network device may receive the first indication information from a second network device (e.g., a last serving network device). For example, for an inactive terminal device, during an RRC connection recovery process, the last serving network device may carry the terminal device's context in a retrieve UE context response message sent to the first network device, and the terminal device's context may include the first indication information, thereby enabling the first network device to obtain the first indication information.

[0120] S202. In response to the first indication information, the first network device sends second indication information to the terminal device.

[0121] Correspondingly, the terminal device receives second indication information from the first network device.

[0122] The first network device may determine the second indication information in the following ways:

[0123] In a possible implementation, when the first indication information indicates that the second indication information is configured for the terminal device, if the cell that the terminal device attempts to access (the terminal device sends an RRC establishment request message or an RRC recovery request message to the first network device, etc.) is a CAG cell, then the second indication information indicates that the terminal device only accesses the system through the CAG cell.

[0124] It should be noted that the first network device can also determine the second indication information in combination with the allowed CAG list, that is, when the first indication information indicates that the second indication information is configured for the terminal device, if the cell that the terminal device attempts to access is a CAG cell, and the identifier of the CAG cell belongs to the allowed CAG list, then the second indication information instructs the terminal device to access the system only through the CAG cell. The reason is that in the previous implementation method, whether the identifier of the CAG cell belongs to the allowed CAG list is not checked. If the identifier of the CAG cell does not belong to the allowed CAG list, it is possible that when the terminal device attempts to access through the CAG cell, it will be rejected by the core network device, which will trigger the terminal device to access again.

[0125] In another possible implementation, when the first indication information indicates that the second indication information is configured for the terminal device, if the cell that the terminal device attempts to access (the terminal device sends an RRC establishment request message or an RRC recovery request message to the first network device, etc.) is a PLMN cell, then the second indication information indicates that the terminal device only accesses the system through the PLMN cell.

[0126] It should be noted that, in addition to the above-mentioned method of determining the second indication information, when the terminal device is in a connected state, the first network device can also determine the second indication information based on a measurement report from the terminal device, or the measurement report and the allowed CAG list.

[0127] The measurement report includes at least the identifier of the serving cell, and the identifier and measurement results of the neighboring cells. The serving cell refers to the cell where the terminal device resides. The measurement report may also include the measurement results of the serving cell.

[0128] The identifier (the identifier of the serving cell or the identifier of the neighboring cell) includes a physical cell identifier (PCI) or a global cell identifier (CGI). The measurement result (the measurement result of the serving cell or the measurement result of the neighboring cell) includes a cell measurement result and / or a beam measurement result.

[0129] In one possible implementation, the serving cell is a PLMN cell, and the neighbor cells include at least one CAG cell. If the communication quality of the at least one CAG cell is good, and the identifier of the at least one CAG cell belongs to the allowed CAG list, the second indication information instructs the terminal device to access the system only through the CAG cell.

[0130] That is, the first network device determines that the service cell is a PLMN cell based on the identifier of the service cell; determines that the neighbor cells include at least one CAG cell based on the identifier of the neighbor cell; and determines that the second indication information instructs the terminal device to access the system only through the CAG cell based on the measurement result of at least one CAG cell being higher than the first threshold and the identifier of at least one CAG cell belonging to the allowed CAG list.

[0131] In another possible implementation, the serving cell is a CAG cell, and the neighbor cells include only PLMN cells. If the communication quality of the PLMN cell is good and the communication quality of the CAG cell is poor, the second indication information instructs the terminal device to access the system only through the PLMN cell.

[0132] That is, the first network device determines that the service cell is a CAG cell based on the identifier of the service cell; determines that the neighbor cells only include PLMN cells based on the identifier of the neighbor cells; the first network device determines that the second indication information instructs the terminal device to access the system only through the PLMN cell based on the measurement result of the PLMN cell being higher than the second threshold and the measurement result of the service cell being lower than the third threshold.

[0133] For example, in the RRC connection establishment process described above, for the acquisition of the second indication information actively triggered by the terminal device, the first network device may carry the second indication information in the RRC setup message sent to the terminal device. For the first network device autonomously deciding to configure the second indication information for the terminal device, the first network device may carry the second indication information in the RRC reconfiguration message sent to the terminal device.

[0134] For example, in the RRC connection recovery process described above, if the first network device successfully obtains the context of the terminal device from the second network device (e.g., the most recently serving network device), the first network device may carry second indication information in an RRC resume message sent to the terminal device. If the first network device fails to successfully obtain the context of the terminal device from the second network device, the first network device may carry second indication information in an RRC setup message sent to the terminal device.

[0135] Exemplarily, for the first network device mentioned above, the second indication information is determined based on the measurement report from the terminal device, or the measurement report and the allowed CAG list. The first network device can carry the second indication information in the RRC release message sent to the terminal device.

[0136] S203. In response to the second indication information, the terminal device accesses the system through a CAG cell or accesses the system through a PLMN cell.

[0137] If the second indication information indicates that the terminal device accesses the system only through the CAG cell, the terminal device accesses the system through the CAG cell. If the second indication information indicates that the terminal device accesses the system only through the PLMN cell, the terminal device accesses the system through the PLMN cell.

[0138] In an embodiment of the present application, a method for sending indication information is provided, in which a first network device receives first indication information, wherein the first indication information is used to indicate whether to configure second indication information for the terminal device, and the second indication information indicates that the terminal device accesses the system only through a CAG cell, or only through a PLMN cell. In response to the first indication information, the first network device sends second indication information to the terminal device, so that the terminal device can access the system through the CAG cell or through the PLMN cell in response to the second indication information. The first network device restricts access to a terminal device that supports both CAG access and PLMN access, thereby controlling the terminal device's access to the CAG cell or the PLMN cell.

[0139] The above-mentioned method for sending indication information is explained below in conjunction with specific messages between the terminal device, the first network device, the second network device, and the core network device.

[0140] In a possible implementation, when the terminal device is in an idle state, the RRC establishment process is triggered due to data transmission. The terminal device can actively request second indication information from the first network device by sending first indication information to the first network device.

[0141] like Figure 3As shown, the embodiment of the present application provides a method for sending indication information, which includes S301-S305:

[0142] S301. The terminal device sends an RRC setup request message to the first network device.

[0143] Correspondingly, the first network device receives an RRC establishment request message from the terminal device, where the RRC establishment request message includes first indication information.

[0144] At this time, the terminal device is in the RRC idle state and the connection management (CM) idle state.

[0145] This step corresponds to the description related to the first network device receiving the first indication information from the terminal device in step S201.

[0146] S302. The first network device sends an RRC setup message to the terminal device.

[0147] Correspondingly, the terminal device receives an RRC establishment message from the first network device, where the RRC establishment message includes second indication information.

[0148] At this time, the terminal device is in the RRC connected state and the connection management (CM) idle state.

[0149] This step corresponds to step S202. For details on how to determine the second indication information, see step S202.

[0150] S303. The terminal device sends an RRC setup complete message to the first network device.

[0151] Correspondingly, the first network device receives an RRC setup completion message from the terminal device, where the RRC setup completion message includes a first non-access stratum (NAS) message of the terminal device.

[0152] At this time, the terminal device is in RRC connection state and CM connection state.

[0153] S304. In response to the second indication information, the terminal device accesses the system through a CAG cell or accesses the system through a PLMN cell.

[0154] See step S203 for details.

[0155] S305. The first network device sends the NAS message to the core network device (e.g., AMF device).

[0156] In another possible implementation, when the terminal device is in an idle state, the RRC establishment process is triggered due to data transmission. The first network device may obtain the first indication information from the core network device (such as the AMF device) and actively send the second indication information to the terminal device.

[0157] like Figure 4 As shown, an embodiment of the present application provides a method for sending indication information, which includes S401-S411:

[0158] S401. The terminal device sends an RRC setup request message to the first network device.

[0159] At this time, the terminal device is in RRC idle state and CM idle state.

[0160] S402. The first network device sends an RRC setup message to the terminal device.

[0161] Correspondingly, the terminal device receives an RRC establishment message from the first network device.

[0162] At this time, the terminal device is in the RRC connected state and the connection management (CM) idle state.

[0163] S403. The terminal device sends an RRC setup complete message to the first network device.

[0164] Correspondingly, the first network device receives an RRC setup completion message from the terminal device, where the RRC setup completion message includes the first NAS message of the terminal device.

[0165] At this time, the terminal device is in RRC connection state and CM connection state.

[0166] S404. The first network device sends the NAS message to the core network device.

[0167] S405. The core network device exchanges additional NAS messages with the terminal device through the first network device.

[0168] For example, the core network device sends a downlink NAS transport message to the first network device. The first network device sends a downlink information transfer message to the terminal device. The terminal device sends an uplink information transfer message to the first network device. The first network device sends an uplink NAS transport message to the core network device.

[0169] S406. The core network device determines the first indication information according to the context of the terminal device.

[0170] S407: The core network device sends an initial context setup request message to the first network device.

[0171] Correspondingly, the first network device receives an initial context establishment request message from the core network device, where the initial context establishment request message includes the first indication information.

[0172] This step corresponds to the description related to the first network device receiving the first indication information from the core network device in step S201.

[0173] S408: The first network device activates access stratum (AS) security of the terminal device.

[0174] For example, the first network device sends a security mode command message to the terminal device, and the terminal device sends a security mode complete message to the first network device.

[0175] S409. The first network device sends an RRC reconfiguration message to the terminal device.

[0176] Correspondingly, the terminal device receives an RRC reconfiguration message from the first network device, where the RRC reconfiguration message includes the second indication information. The RRC reconfiguration message is used to execute the reconfiguration process.

[0177] This step corresponds to step S202. For details on how to determine the second indication information, see step S202.

[0178] S410. In response to the second indication information, the terminal device accesses the system through a CAG cell or accesses the system through a PLMN cell.

[0179] This step corresponds to S203.

[0180] S411. The first network device sends an initial context setup response message to the core network device.

[0181] Correspondingly, the core network device receives an initial context establishment response message from the first network device, where the initial context establishment response message is used to notify the core network device that the establishment process is completed.

[0182] In another possible implementation, when the terminal device is in an inactive state, an RRC resume process is triggered due to data transmission or RNA update. When the terminal device moves between different types of cells (moving from a CAG cell to a PLMN cell, or from a PLMN cell to a CAG cell), the terminal device can actively request second indication information from the first network device by sending first indication information to the first network device, and the first network device successfully obtains the context of the terminal device from the second network device (e.g., the last serving network device).

[0183] It should be noted that if the terminal device is within the range of a CAG cell, and if the CAG ID of the cell belongs to the allowed CAG list of the terminal device, the terminal device cannot obtain PLMN services through the cell unless the terminal device detects that it has left the coverage of the CAG cell based on positioning technology, proximity indication or other technologies.

[0184] like Figure 5 As shown, an embodiment of the present application provides a method for sending indication information, which includes S501-S510:

[0185] S501. The terminal device sends an RRC resume request message to the first network device.

[0186] Correspondingly, the first network device receives an RRC recovery request message from the terminal device, where the RRC recovery request message includes first indication information.

[0187] At this time, the terminal device is in RRC inactive state and CM connected state.

[0188] This step corresponds to the description related to the first network device receiving the first indication information from the terminal device in step S201.

[0189] S502: The first network device sends a retrieve UE context request message to the second network device.

[0190] Correspondingly, the second network device receives an obtain UE context request message from the first network device, where the obtain UE context request message is used to request the context of the terminal device from the second network device.

[0191] S503: The second network device sends a retrieve UE context response message to the first network device.

[0192] Correspondingly, the first network device receives a UE context obtain response message from the second network device.

[0193] S504. The first network device sends an RRC resume message to the terminal device.

[0194] Correspondingly, the terminal device receives an RRC recovery message from the first network device, where the RRC recovery message includes second indication information.

[0195] At this time, the terminal device is in RRC connection state and CM connection state.

[0196] This step corresponds to step S202. For details on how to determine the second indication information, see step S202.

[0197] S505. In response to the second indication information, the terminal device accesses the system through the CAG cell or accesses the system through the PLMN cell.

[0198] See step S203 for details.

[0199] S506. The terminal device sends an RRC resume complete message to the first network device.

[0200] Correspondingly, the first network device receives an RRC recovery complete message from the terminal device.

[0201] At this point, the first network device and the terminal device complete the recovery of the RRC connection.

[0202] S507: The first network device sends an Xn-U address indication message to the second network device.

[0203] Correspondingly, the second network device receives an Xn-U address indication message from the first network device, where the Xn-U address indication message is used to indicate the forwarding address.

[0204] S508. The second network device sends a path switch request message to the core network device.

[0205] Correspondingly, the core network device receives a path switching request message from the second network device, where the path switching request message is used to request path switching.

[0206] S509. The core network device sends a path switch response message to the first network device.

[0207] Correspondingly, the first network device receives a path switching response message from the core network device.

[0208] S510. The first network device sends a UE context release message to the second network device.

[0209] Correspondingly, the second network device receives a UE context release message from the first network device, where the UE context release message is used to trigger the second network device to release the context of the terminal device.

[0210] In another possible implementation, when the terminal device is in an inactive state, an RRC resume process is triggered due to data transmission or RNA update. The first network device may obtain first indication information from a second network device (e.g., a nearest serving network device) and proactively send second indication information to the terminal device.

[0211] like Figure 6 As shown, an embodiment of the present application provides a method for sending indication information, and the method for sending indication information includes S601-S610:

[0212] S601. The terminal device sends an RRC resume request message to the first network device.

[0213] Correspondingly, the first network device receives an RRC recovery request message from the terminal device.

[0214] At this time, the terminal device is in RRC inactive state and CM connected state.

[0215] S602: The first network device sends a retrieve UE context request message to the second network device.

[0216] Correspondingly, the second network device receives an obtain UE context request message from the first network device, where the obtain UE context request message is used to request the context of the terminal device from the second network device.

[0217] S603: The second network device sends a UE context acquisition response message to the first network device.

[0218] Correspondingly, the first network device receives a retrieve UE context response message from the second network device, where the retrieve UE context response message includes the context of the terminal device, and the context of the terminal device includes the first indication information.

[0219] This step corresponds to the description related to the first network device receiving the first indication information from the second network device in step S201.

[0220] Steps S604-S610 are the same as steps S504-S510 and are not repeated here.

[0221] In another possible implementation, when the terminal device is in an inactive state, an RRC resume process is triggered due to data transmission or RNA update. When the terminal device moves between different types of cells (from a CAG cell to a PLMN cell, or from a PLMN cell to a CAG cell), the terminal device may actively request second indication information from the first network device by sending first indication information to the first network device, but the first network device fails to obtain the context of the terminal device from the second network device.

[0222] like Figure 7 As shown, an embodiment of the present application provides a method for sending indication information, and the method for sending indication information includes S701-S706:

[0223] Steps S701-S702 are the same as steps S501-S502 and are not repeated here.

[0224] S703: The second network device fails to obtain or verify the context of the terminal device, and sends a retrieve UE context failure message to the first network device.

[0225] Correspondingly, the first network device receives a UE context acquisition failure message from the second network device.

[0226] S704. The first network device sends an RRC Setup message to the terminal device.

[0227] Correspondingly, the terminal device receives an RRC establishment message from the first network device, where the RRC establishment message includes second indication information.

[0228] This step corresponds to step S202. For details on how to determine the second indication information, see step S202.

[0229] S705. In response to the second indication information, the terminal device accesses the system through the CAG cell or accesses the system through the PLMN cell.

[0230] The RRC establishment message is used to instruct the terminal device to perform a fallback to establish a new RRC connection. The terminal device performs the behavior when it is in the idle state. For example, the terminal device can respond to the second indication information when it next establishes an RRC connection and access the system through the CAG cell or the PLMN cell. See step S203 for details.

[0231] In another possible implementation, when the terminal device is in a connected state, the terminal device sends a measurement report to the first network device. The first network device determines the second indication information based on the measurement report from the terminal device, or the measurement report and the allowed CAG list of the terminal device, and sends it to the terminal device.

[0232] like Figure 8 As shown, an embodiment of the present application provides a method for sending indication information, and the method for sending indication information includes S801-S806:

[0233] S801. The terminal device measures the serving cell and the neighboring cell to obtain a measurement report, and sends the measurement report to the first network device.

[0234] For the content of the measurement report, please refer to the relevant description of step S201 and will not be repeated here.

[0235] S802. The first network device determines second indication information based on a measurement report from the terminal device, or the measurement report and an allowed CAG list.

[0236] This step can refer to the relevant description in step S201 for the first network device to determine the second indication information based on the measurement report from the terminal device, or the measurement report and the allowed CAG list, and will not be repeated here.

[0237] S803. The first network device sends an RRC release message to the terminal device.

[0238] Correspondingly, the terminal device receives an RRC release message from the first network device, where the RRC release message includes second indication information.

[0239] S804: The terminal device enters an idle state.

[0240] The above describes the communication method provided by the embodiment of the present invention. The following describes the first network device, terminal device and core network device provided by the embodiment of the present invention.

[0241] like Figure 9 As shown, an embodiment of the present application provides a first network device, and the first network device 90 includes:

[0242] The transceiver module 901 is used to receive first indication information, wherein the first indication information is used to indicate that second indication information is configured for the terminal device, and the second indication information is used to indicate that the terminal device only accesses the system through a closed access group CAG cell or only accesses the system through a public land mobile network PLMN cell.

[0243] The transceiver module 901 is further configured to send second indication information to the terminal device in response to the first indication information.

[0244] In a possible implementation, the transceiver module 901 is specifically configured to receive first indication information from a terminal device.

[0245] In a possible implementation, the transceiver module 901 is specifically configured to receive first indication information from the second network device.

[0246] In a possible implementation, the transceiver module 901 is specifically configured to receive first indication information from a core network device.

[0247] In one possible embodiment, the first network device also includes a processing module 902, which is used to determine the second indication information based on a measurement report from the terminal device, or a measurement report and an allowed CAG list, wherein the measurement report includes at least an identifier of the serving cell, and an identifier and measurement result of the neighbor cell; the allowed CAG list includes the identifier of the CAG cell that the terminal device is allowed to access.

[0248] In one possible implementation, the processing module 902 is specifically used to: determine that the serving cell is a PLMN cell based on the identifier of the serving cell; determine that the neighboring cells include at least one CAG cell based on the identifier of the neighboring cell; and determine that the second indication information indicates that the terminal device accesses the system only through the CAG cell based on the measurement result of at least one CAG cell being higher than the first threshold and the identifier of at least one CAG cell belonging to the allowed CAG list.

[0249] In one possible implementation, the measurement report also includes the measurement results of the serving cell, and the processing module 902 is specifically used to: determine that the serving cell is a CAG cell based on the identifier of the serving cell; determine that the neighboring cells only include PLMN cells based on the identifier of the neighboring cells; and determine that the second indication information indicates that the terminal device accesses the system only through the PLMN cell based on the measurement result of the PLMN cell being higher than the second threshold and the measurement result of the serving cell being lower than the third threshold.

[0250] In a possible implementation, in the first network device, the first indication information is stored in the context of the terminal device.

[0251] In a possible implementation, when the terminal device is in an inactive state, the first indication information is stored in an inactive access layer context of the terminal device.

[0252] In a possible implementation, when the terminal device is in a connected state, the first indication information is stored in an access layer context of the terminal device.

[0253] It should be understood that the processing module 902 in the embodiment of the present invention may be implemented by a processor or a processor-related circuit component, and the transceiver module 901 may be implemented by a transceiver or a transceiver-related circuit component.

[0254] like Figure 10 As shown, an embodiment of the present invention further provides a first network device, the first network device 100 including a processor 1001, a memory 1002, and a transceiver 1003. The memory 1002 stores instructions or programs, and the processor 1001 is configured to execute the instructions or programs stored in the memory 1002. When the instructions or programs stored in the memory 1002 are executed, the processor 1001 is configured to execute the operations performed by the processing module 902 in the above embodiment, and the transceiver 1003 is configured to execute the operations performed by the transceiver module 901 in the above embodiment.

[0255] It should be understood that the first network device 90 or the first network device 100 according to the embodiment of the present invention may correspond to the first network device in the instruction information sending method according to the embodiment of the present invention, and the operations and / or functions of the various modules in the first network device 90 or the first network device 100 are respectively to implement Figures 2 to 8 For the sake of brevity, the corresponding processes of each method in are not repeated here.

[0256] like Figure 11 As shown, an embodiment of the present application provides a terminal device, the terminal device 110 including:

[0257] The transceiver module 1101 is used to receive second indication information from the first network device, where the second indication information is used to instruct the terminal device to access the system only through the CAG cell or only through the PLMN cell.

[0258] The processing module 1102 is configured to access the system through a CAG cell or a PLMN cell in response to the second indication information.

[0259] In a possible implementation, the transceiver module 1101 is further used to: send first indication information to the first network device, wherein the first indication information is used to indicate configuration of second indication information for the terminal device.

[0260] In a possible implementation, the transceiver module 1101 is further used to: send a measurement report to the first network device, wherein the measurement report includes at least an identifier of the serving cell, and an identifier and measurement result of a neighboring cell, the serving cell is a PLMN cell, and the neighboring cell includes at least one CAG cell, or the serving cell is a CAG cell and the neighboring cell includes only a PLMN cell.

[0261] In a possible implementation, the measurement report further includes a measurement result of the serving cell.

[0262] In a possible implementation, the first indication information is stored in the context of the terminal device.

[0263] In a possible implementation, when the terminal device is in an inactive state, the first indication information is stored in an inactive access layer context of the terminal device.

[0264] In a possible implementation, when the terminal device is in a connected state, the first indication information is stored in an access layer context of the terminal device.

[0265] It should be understood that the processing module 1102 in the embodiment of the present invention may be implemented by a processor or a processor-related circuit component, and the transceiver module 1101 may be implemented by a transceiver or a transceiver-related circuit component.

[0266] like Figure 12 As shown, an embodiment of the present invention further provides a terminal device, the terminal device 120 including a processor 1201, a memory 1202, and a transceiver 1203, wherein the memory 1202 stores instructions or programs, and the processor 1201 is configured to execute the instructions or programs stored in the memory 1202. When the instructions or programs stored in the memory 1202 are executed, the processor 1201 is configured to perform the operations performed by the processing module 1102 in the above embodiment, and the transceiver 1203 is configured to perform the operations performed by the transceiver module 1101 in the above embodiment.

[0267] It should be understood that the terminal device 110 or the terminal device 120 according to the embodiment of the present invention may correspond to the terminal device in the instruction information sending method of the embodiment of the present invention, and the operations and / or functions of the various modules in the terminal device 110 or the terminal device 120 are respectively to achieve Figures 2 to 8 For the sake of brevity, the corresponding processes of each method in are not repeated here.

[0268] like Figure 13 As shown, an embodiment of the present application provides a core network device, and the core network device 130 includes:

[0269] The processing module 1301 is configured to determine first indication information, where the first indication information is used to instruct configuration of second indication information for a communication device, and the second indication information is used to instruct the communication device to access the system only through a closed access group (CAG) cell or only through a public land mobile network (PLMN) cell.

[0270] The transceiver module 1302 is configured to send first indication information to the first network device.

[0271] It should be understood that the processing module 1301 in the embodiment of the present invention can be implemented by a processor or a processor-related circuit component, and the transceiver module 1302 can be implemented by a network interface or a network interface-related circuit component.

[0272] like Figure 14 As shown, an embodiment of the present invention further provides a core network device, the core network device 140 including a processor 1401, a memory 1402, and a network interface 1403, wherein the memory 1402 stores instructions or programs, and the processor 1401 is configured to execute the instructions or programs stored in the memory 1402. When the instructions or programs stored in the memory 1402 are executed, the processor 1401 is configured to execute the operations performed by the processing module 1301 in the above embodiment, and the network interface 1403 is configured to execute the operations performed by the transceiver module 1302 in the above embodiment.

[0273] It should be understood that the core network device 130 or the core network device 140 according to the embodiment of the present invention may correspond to the core network device in the instruction information sending method of the embodiment of the present invention, and the operations and / or functions of each module in the core network device 130 or the core network device 140 are respectively to achieve Figures 2 to 8 For the sake of brevity, the corresponding processes of each method in are not repeated here.

[0274] An embodiment of the present application further provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the process related to the first network device in the indication information sending method provided in the above method embodiment can be implemented.

[0275] An embodiment of the present application also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the process related to the terminal device in the indication information sending method provided in the above method embodiment can be implemented.

[0276] An embodiment of the present application also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it can implement the process related to the core network device in the indication information sending method provided in the above method embodiment.

[0277] The present application also provides a communication device, which can be a first network device or a circuit, and can be used to execute the actions executed by the first network device in the above method embodiment.

[0278] like Figure 15 As shown, the communication device 150 includes one or more radio frequency units, such as a remote radio unit (RRU) 1501 and one or more baseband units (BBU) (also known as digital units, DU) 1502. The RRU 1501 can be called a transceiver module. Figure 9 The RRU 1501 corresponds to the transceiver module 901 in the figure. Optionally, the transceiver module can also be called a transceiver, a transceiver circuit, or a transceiver, etc., and can include at least one antenna 1503 and a radio frequency unit 1504. The RRU 1501 is mainly used for transmitting and receiving radio frequency signals and converting radio frequency signals into baseband signals, for example, for sending indication information to terminal devices. The BBU 1502 is mainly used for baseband processing and controlling the base station. The RRU 1501 and BBU 1502 can be physically arranged together or physically separated, i.e., a distributed base station.

[0279] The BBU 1502 is the control center of the base station, which can also be called a processing module. Figure 9 The processing module 902 in FIG. 1 corresponds to the processing module 902 in FIG. 1 , which is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, spread spectrum, etc. For example, the BBU 1502 can be used to control the base station to execute the operation process of the first network device in the above method embodiment.

[0280] In one example, the BBU 1502 may be composed of one or more single boards, and the multiple single boards may jointly support a wireless access network of a single access standard (such as an LTE network), or may respectively support wireless access networks of different access standards (such as an LTE network, a 5G network, or other networks). The BBU 1502 also includes a memory 1505 and a processor 1506, and the processor 1506 is connected to the memory 1505. The memory 1505 is used to store computer programs and data. The processor 1506 is used to execute the computer program stored in the memory 1505, for example, to control the base station to execute the operation process of the first network device in the above method embodiment. The memory 1505 and the processor 1506 can serve one or more single boards. That is, a memory and a processor can be set separately on each single board. Alternatively, multiple single boards may share the same memory and processor. In addition, necessary circuits may be set on each single board.

[0281] The present application also provides a communication device, which can be a terminal device or a circuit, and can be used to execute the actions executed by the terminal device in the above method embodiment.

[0282] like Figure 16 As shown, taking a mobile phone as an example, the communication device 160 includes a processor 1601, a memory 1602, a radio frequency circuit 1603, an antenna 1604, and an input / output device 1605. The processor 1601 is connected to the memory 1602. The memory 1602 is mainly used to store computer programs and data. The processor 1601 is mainly used to execute the computer programs stored in the memory 1602, for example, to process communication protocols and communication data, and to control the terminal device. The radio frequency circuit 1603 is mainly used to convert baseband signals into radio frequency signals and to process radio frequency signals. The antenna 1604 is mainly used to transmit and receive radio frequency signals in the form of electromagnetic waves. The input / output device 1605 includes, for example, a touch screen, a display screen, a keyboard, etc., and is mainly used to receive data input by the user and output data to the user. It should be noted that some types of terminal devices may not have input / output devices.

[0283] When data needs to be sent, processor 1601 performs baseband processing on the data to be sent and outputs the baseband signal to RF circuit 1603. RF circuit 1603 performs RF processing on the baseband signal and then transmits the RF signal to the outside in the form of electromagnetic waves through antenna 1604. When data is sent to the terminal device, RF circuit 1603 receives the RF signal through antenna 1604, converts the RF signal into a baseband signal, and outputs the baseband signal to processor 1601. Processor 1601 converts the baseband signal into data and processes the data. For ease of explanation, Figure 16Only one memory and processor are shown. In an actual terminal device product, one or more processors and one or more memories may exist. Memory 1602 may also be referred to as a storage medium or storage device. Memory 1602 may be provided independently of the processor or integrated with the processor, and this embodiment of the application does not limit this.

[0284] RF circuit 1603 can be used with Figure 11 Corresponding to the transceiver module 1101 in the embodiment of the method, the processor 1601 can be used to perform the sending operation and the receiving operation of the terminal device side in the embodiment of the method. Figure 11 Corresponding to the processing module 1102 in the embodiment, it is used to perform other operations except the sending and receiving operations on the terminal device in the above method embodiment.

[0285] The present application also provides a communication device, which can be a core network device or a circuit. The communication device can be used to execute the actions executed by the core network device in the above method embodiment.

[0286] like Figure 17 As shown, the communication device 170 includes: at least one processor 1701, at least one memory 1702, and at least one communication interface 1703. The at least one processor 1701, at least one memory 1702, and at least one communication interface 1703 may be connected via a bus.

[0287] Memory 1702 is configured to store computer program code. Processor 1701 is configured to execute the computer program stored in memory 1702 to perform the functions of the core network device in each of the above method embodiments. Communication interface 1703 is configured to communicate with other communication devices, such as the first network device. Communication interface 1703 can communicate via wired or wireless communication.

[0288] The communication interface 1703 can be used with Figure 13 Corresponding to the transceiver module 1302 in the embodiment of the method, the processor 1701 can be used to perform the sending operation of the core network device in the embodiment of the method. Figure 13 Corresponding to the processing module 1301 in the embodiment, it is used to perform other operations except the sending and receiving operations on the core network device in the above method embodiment.

[0289] The processor mentioned in the embodiments of the present application may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0290] It should also be understood that the memory mentioned in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM).

[0291] It should be noted that when the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, the memory (storage module) can be integrated into the processor.

[0292] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0293] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel 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 application.

[0294] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0295] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0296] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0297] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0298] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using a software program, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loading and executing computer program instructions on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website, computer, server or data center by wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) mode to another website, computer, server or data center. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that contains one or more media that can be integrated. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (eg, a solid state disk (SSD)).

[0299] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A first network device, characterized in that: include: a transceiver module, configured to receive first indication information, wherein the first indication information is used to instruct configuration of second indication information for a communication device, and the second indication information is used to instruct the communication device to access the system only through a closed access group (CAG) cell or only through a public land mobile network (PLMN) cell; The transceiver module is further configured to send the second indication information to the communication device in response to the first indication information; a processing module, configured to determine the second indication information based on a measurement report from the communication device, or the measurement report and an allowed CAG list, wherein the measurement report includes at least an identifier of a serving cell and an identifier and a measurement result of a neighbor cell; and the allowed CAG list includes identifiers of CAG cells that the communication device is allowed to access; The processing module is specifically used for: Determining, according to the identifier of the serving cell, that the serving cell is a PLMN cell; Determining, according to the identifier of the neighbor cell, that the neighbor cell includes at least one CAG cell; determining, based on the measurement result of the at least one CAG cell being higher than a first threshold and the identifier of the at least one CAG cell belonging to the allowed CAG list, that the second indication information indicates that the communication device accesses the system only through the CAG cell; The measurement report also includes a measurement result of the serving cell, and the processing module is specifically configured to: Determining, according to the identifier of the serving cell, that the serving cell is a CAG cell; Determining, according to the identifiers of the neighbor cells, that the neighbor cells only include PLMN cells; According to the measurement result of the PLMN cell being higher than a second threshold and the measurement result of the serving cell being lower than a third threshold, it is determined that the second indication information instructs the communication device to access the system only through the PLMN cell.

2. The first network device according to claim 1, wherein: The transceiver module is specifically used for: The first indication information is received from the communication device.

3. The first network device according to claim 1, characterized in that The transceiver module is specifically used for: The first indication information is received from the second network device.

4. The first network device according to claim 1, wherein: The transceiver module is specifically used for: The first indication information is received from a core network device.

5. The first network device according to any one of claims 1 to 4, characterized in that: In the first network device, the first indication information is stored in the context of the communication apparatus.

6. The first network device according to claim 5, characterized in that When the communication device is in an inactive state, the first indication information is stored in an inactive access stratum context of the communication device.

7. The first network device according to claim 5, characterized in that When the communication device is in a connected state, the first indication information is stored in an access layer context of the communication device.

8. A communication device, characterized in that: include: a transceiver module configured to receive second indication information from a first network device, the second indication information being used to instruct a communication device to access the system only through a CAG cell or only through a PLMN cell; the second indication information being determined based on a measurement report from the communication device, or the measurement report and an allowed CAG list, wherein the measurement report includes at least an identifier of a serving cell, and an identifier and measurement result of a neighboring cell; the allowed CAG list includes identifiers of CAG cells that the communication device is allowed to access; if the serving cell is determined to be a PLMN cell based on the identifier of the serving cell, the neighboring cell is determined to include at least one CAG based on the identifier of the neighboring cell. cell, when the measurement result of the at least one CAG cell is higher than the first threshold and the identifier of the at least one CAG cell belongs to the allowed CAG list, the second indication information instructs the communication device to access the system only through the CAG cell; the measurement report also includes the measurement result of the serving cell, if the serving cell is determined to be a CAG cell according to the identifier of the serving cell, and the neighboring cells are determined to include only PLMN cells according to the identifier of the neighboring cells, when the measurement result of the PLMN cell is higher than the second threshold and the measurement result of the serving cell is lower than the third threshold, the second indication information instructs the communication device to access the system only through the PLMN cell; A processing module is used to access the system through a CAG cell or a PLMN cell in response to the second indication information.

9. The communication device according to claim 8, wherein: The transceiver module is also used for: First indication information is sent to the first network device, wherein the first indication information is used to indicate that the second indication information is configured for the communication apparatus.

10. The communication device according to claim 9, wherein: The first indication information is stored in the context of the communication device. The communication device according to claim 10 , wherein: When the communication device is in an inactive state, the first indication information is stored in an inactive access stratum context of the communication device.

12. The communication device according to claim 10, wherein: When the communication device is in a connected state, the first indication information is stored in an access layer context of the communication device.

13. A core network device, characterized in that: include: a processing module, configured to determine first indication information, wherein the first indication information is used to instruct configuration of second indication information for a communication device, and the second indication information is used to instruct the communication device to access the system only through a closed access group (CAG) cell or only through a public land mobile network (PLMN) cell; a transceiver module, configured to send the first indication information to the first network device; The second indication information is determined based on a measurement report from the communication device, or the measurement report and an allowed CAG list, wherein the measurement report includes at least an identifier of a serving cell, and an identifier and measurement result of a neighboring cell; the allowed CAG list includes identifiers of CAG cells that the communication device is allowed to access; if the serving cell is determined to be a PLMN cell based on the identifier of the serving cell, and the neighboring cells are determined to include at least one CAG cell based on the identifier of the neighboring cell, and if the measurement result of the at least one CAG cell is higher than a first threshold and the identifier of the at least one CAG cell belongs to the allowed CAG list, the second indication information instructs the communication device to access the system only through CAG cells; the measurement report also includes the measurement result of the serving cell; if the serving cell is determined to be a CAG cell based on the identifier of the serving cell, and the neighboring cells are determined to include only PLMN cells based on the identifier of the neighboring cell, and if the measurement result of the PLMN cell is higher than a second threshold and the measurement result of the serving cell is lower than a third threshold, the second indication information instructs the communication device to access the system only through PLMN cells.

14. A method for sending indication information, characterized in that: include: The first network device receives first indication information, wherein the first indication information is used to instruct configuration of second indication information for the communication device, and the second indication information is used to instruct the communication device to access the system only through a closed access group (CAG) cell or only through a public land mobile network (PLMN) cell; In response to the first indication information, the first network device sends the second indication information to the communication device; The method further comprises: The first network device determines the second indication information based on a measurement report from the communication device, or the measurement report and an allowed CAG list, wherein the measurement report includes at least an identifier of a serving cell and an identifier and a measurement result of a neighbor cell; and the allowed CAG list includes identifiers of CAG cells that the communication device is allowed to access. The first network device determines the second indication information according to a measurement report from the communication device, or according to the measurement report and an allowed CAG list, including: The first network device determines, according to the identifier of the serving cell, that the serving cell is a PLMN cell; The first network device determines, according to the identifier of the neighbor cell, that the neighbor cell includes at least one CAG cell; The first network device determines, based on the measurement result of the at least one CAG cell being higher than the first threshold and the identifier of the at least one CAG cell belonging to the allowed CAG list, that the second indication information indicates that the communication device accesses the system only through the CAG cell; The measurement report further includes a measurement result of the serving cell, and the first network device determines the second indication information according to the measurement report from the communication device, or the measurement report and an allowed CAG list, including: The first network device determines, according to the identifier of the serving cell, that the serving cell is a CAG cell; The first network device determines, according to the identifier of the neighbor cell, that the neighbor cells only include PLMN cells; The first network device determines that the second indication information instructs the communication device to access the system only through the PLMN cell based on the measurement result of the PLMN cell being higher than the second threshold and the measurement result of the serving cell being lower than the third threshold.

15. The method according to claim 14, characterized in that The first network device receiving the first indication information includes: The first network device receives the first indication information from the communication apparatus.

16. The method according to claim 14, characterized in that The first network device receiving the first indication information includes: The first network device receives the first indication information from the second network device.

17. The method according to claim 14, characterized in that The first network device receiving the first indication information includes: The first network device receives the first indication information from a core network device.

18. The method according to any one of claims 14 to 17, characterized in that: In the first network device, the first indication information is stored in the context of the communication apparatus.

19. The method according to claim 18, characterized in that When the communication device is in an inactive state, the first indication information is stored in an inactive access stratum context of the communication device.

20. The method according to claim 18, wherein When the communication device is in a connected state, the first indication information is stored in an access layer context of the communication device.

21. A method for sending indication information, characterized in that: include: receiving second indication information from the first network device, where the second indication information is used to instruct the communication device to access the system only through a CAG cell or only through a PLMN cell; The second indication information is determined based on a measurement report from the communication device, or the measurement report and an allowed CAG list, wherein the measurement report includes at least an identifier of a serving cell, and an identifier and measurement result of a neighboring cell; the allowed CAG list includes identifiers of CAG cells that the communication device is allowed to access; if the serving cell is determined to be a PLMN cell based on the identifier of the serving cell, and the neighboring cells are determined to include at least one CAG cell based on the identifier of the neighboring cells, and if the measurement result of the at least one CAG cell is higher than a first threshold and the identifier of the at least one CAG cell belongs to the allowed CAG list, the second indication information instructs the communication device to access the system only through CAG cells; the measurement report also includes the measurement result of the serving cell; if the serving cell is determined to be a CAG cell based on the identifier of the serving cell, and the neighboring cells are determined to include only PLMN cells based on the identifier of the neighboring cells, and if the measurement result of the PLMN cell is higher than a second threshold and the measurement result of the serving cell is lower than a third threshold, the second indication information instructs the communication device to access the system only through PLMN cells; In response to the second indication information, access the system through a CAG cell or access the system through a PLMN cell.

22. The method according to claim 21, characterized in that The method further comprises: First indication information is sent to the first network device, wherein the first indication information is used to indicate that the second indication information is configured for the communication apparatus.

23. The method according to claim 22, characterized in that The first indication information is stored in the context of the communication device.

24. The method according to claim 23, wherein When the communication device is in an inactive state, the first indication information is stored in an inactive access stratum context of the communication device.

25. The method according to claim 23, wherein When the communication device is in a connected state, the first indication information is stored in an access layer context of the communication device.

26. A method for sending indication information, characterized in that: include: The core network device determines first indication information, wherein the first indication information is used to instruct configuration of second indication information for the communication device, and the second indication information is used to instruct the communication device to access the system only through a closed access group (CAG) cell or only through a public land mobile network (PLMN) cell; The core network device sends the first indication information to the first network device; The second indication information is determined based on a measurement report from the communication device, or the measurement report and an allowed CAG list, wherein the measurement report includes at least an identifier of a serving cell, and an identifier and measurement result of a neighboring cell; the allowed CAG list includes identifiers of CAG cells that the communication device is allowed to access; if the serving cell is determined to be a PLMN cell based on the identifier of the serving cell, and the neighboring cells are determined to include at least one CAG cell based on the identifier of the neighboring cell, and if the measurement result of the at least one CAG cell is higher than a first threshold and the identifier of the at least one CAG cell belongs to the allowed CAG list, the second indication information instructs the communication device to access the system only through CAG cells; the measurement report also includes the measurement result of the serving cell; if the serving cell is determined to be a CAG cell based on the identifier of the serving cell, and the neighboring cells are determined to include only PLMN cells based on the identifier of the neighboring cell, and if the measurement result of the PLMN cell is higher than a second threshold and the measurement result of the serving cell is lower than a third threshold, the second indication information instructs the communication device to access the system only through PLMN cells.

27. A communication device, characterized in that: The device comprises a processor connected to a memory, the memory being used to store a computer program, and the processor being used to execute the computer program stored in the memory, so that the device performs the method according to any one of claims 14 to 20.

28. A communication device, characterized in that: The device comprises a processor connected to a memory, the memory being used to store a computer program, and the processor being used to execute the computer program stored in the memory, so that the device performs the method according to any one of claims 21 to 25.

29. A communication device, characterized in that: The device comprises a processor connected to a memory, the memory being used to store a computer program, and the processor being used to execute the computer program stored in the memory, so that the device performs the method according to claim 26.

30. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed, the method according to any one of claims 14 to 20 is implemented.

31. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed, the method according to any one of claims 21 to 25 is implemented.

32. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed, the method according to claim 26 is implemented.

33. A communication system, characterized in that: It includes the first network device described in any one of claims 1-7, the communication device described in any one of claims 8-12, and the core network device described in claim 13.

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