Wireless communication method and device

Abstract

A wireless communication method and device are provided, the method comprising: a terminal device receives first indication information, the first indication information is used to indicate that the terminal device and a first public land mobile network PLMN can interact. Through the first indication information, the terminal device and the first PLMN can interact, which is equivalent to that through the first indication information, the terminal device can access the IMS in the first PLMN, which not only enables the terminal device in the NPN to access the IMS, but also avoids the deployment of the IMS separately in the NPN, thereby reducing the network deployment cost and system complexity.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of communications, and more specifically, to wireless communication methods and devices. Background Art

[0002] At present, ordinary terminal users use public networks for data services, but in some scenarios, such as office scenarios, home scenarios, and factories, in order to enable more effective and secure management, local users or managers will deploy local networks or private networks, namely non-public networks (NPN). The public network can be a public land mobile network (PLMN).

[0003] The network elements in NPN can exist independently of PLMN, that is, they have their own network elements such as Policy Control Function (PCF), Session Management Function (SMF), Access and Mobility Management Function (AMF), and Unified Data Management (UDM), and have their own root keys, security algorithms, contract information, policy information, etc. to achieve isolation from PLMN.

[0004] However, in the NPN, some services may not be supported, for example, Internet Protocol Multimedia System (IMS) services. Summary of the invention

[0005] Provided are a wireless communication method and device, which can not only enable a terminal device in an NPN to access the IMS by accessing the IMS in the PLMN, but also avoid deploying the IMS separately in the NPN, thereby reducing the network deployment cost and system complexity.

[0006] In a first aspect, a wireless communication method is provided, comprising:

[0007] The terminal device receives first indication information, where the first indication information is used to indicate that the terminal device and a first public land mobile network PLMN can interact with each other.

[0008] In a second aspect, a wireless communication method is provided, including:

[0009] The non-public network NPN access network device receives first indication information, where the first indication information is used to indicate that the terminal device and the first public land mobile network PLMN can interact with each other.

[0010] In a third aspect, a wireless communication method is provided, including:

[0011] The non-public network NPN access and mobility management function AMF sends first indication information to the NPN access network device, where the first indication information is used to indicate that the terminal device and the first public land mobile network PLMN can interact.

[0012] In a fourth aspect, a wireless communication method is provided, including:

[0013] The second session management function SMF receives third indication information sent by a non-public network NPN access network device, where the third indication information is used to indicate a triggering process pointing to a first public land mobile network PLMN. The second SMF is an SMF under a second PLMN, and the first PLMN and the second PLMN are the same or different.

[0014] In a fifth aspect, a terminal device is provided, which is used to execute the method in the first aspect or its implementations. Specifically, the terminal device includes a functional module for executing the method in the first aspect or its implementations.

[0015] In a sixth aspect, an NPN access network device is provided, which is used to execute the method in the second aspect or its respective implementations. Specifically, the network device includes a functional module for executing the method in the second aspect or its respective implementations.

[0016] In a seventh aspect, a core network device is provided, which is used to execute the method in any one of the third to fourth aspects or their respective implementations. Specifically, the network device includes a functional module for executing the method in any one of the third to fourth aspects or their respective implementations.

[0017] In an eighth aspect, a terminal device is provided, comprising a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method in the first aspect or its implementation manners.

[0018] In a ninth aspect, an NPN access network device is provided, comprising a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method in the second aspect or its implementation manners.

[0019] In a tenth aspect, a core network device is provided, comprising a processor and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method in any one of the third to fourth aspects or their respective implementations.

[0020] In the eleventh aspect, a chip is provided for implementing the method in any one of the first to fourth aspects or their respective implementations. Specifically, the chip includes: a processor for calling and running a computer program from a memory, so that a device equipped with the chip executes the method in any one of the first to fourth aspects or their respective implementations.

[0021] In the twelfth aspect, a computer-readable storage medium is provided for storing a computer program, wherein the computer program enables a computer to execute the method in any one of the first to fourth aspects or its various implementations.

[0022] In a thirteenth aspect, a computer program product is provided, comprising computer program instructions, wherein the computer program instructions enable a computer to execute the method in any one of the first to fourth aspects or any of its implementations.

[0023] In a fourteenth aspect, a computer program is provided, which, when executed on a computer, enables the computer to execute the method in any one of the first to fourth aspects or in each of its implementations.

[0024] Based on the above technical solution, through the first indication information, the terminal device and the first PLMN can interact with each other, which is equivalent to that through the first indication information, the terminal device can access the IMS in the first PLMN, which not only enables the terminal device in the NPN to access the IMS, but also avoids the separate deployment of the IMS in the NPN, thereby reducing the network deployment cost and system complexity. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 These are examples of scenarios to which the present application can be applied.

[0026] Figure 2 It is a schematic structural diagram of the system framework provided in the embodiment of the present application.

[0027] Figures 3 to 8 It is a schematic flowchart of the wireless communication method provided in an embodiment of the present application.

[0028] Fig. 9 It is a schematic block diagram of a terminal device provided in an embodiment of the present application.

[0029] Fig.10It is a schematic block diagram of an NPN access network device provided in an embodiment of the present application.

[0030] Fig.11 It is a schematic block diagram of the core network device provided in an embodiment of the present application.

[0031] Fig.12 It is a schematic block diagram of a communication device provided in an embodiment of the present application.

[0032] Fig.13 It is a schematic block diagram of the chip provided in the embodiment of the present application. DETAILED DESCRIPTION

[0033] The following will describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] Figure 1 It is a schematic diagram of an application scenario of an embodiment of the present application.

[0035] like Figure 1 As shown, the communication system 100 may include a terminal device 110 and a network device 120. The network device 120 may communicate with the terminal device 110 via an air interface. The terminal device 110 and the network device 120 support multi-service transmission.

[0036] It should be understood that the embodiments of the present application are only exemplified by the communication system 100, but the embodiments of the present application are not limited thereto. That is to say, the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: Long Term Evolution (LTE) system, LTE Time Division Duplex (TDD), Universal Mobile Telecommunication System (UMTS), 5G communication system (also known as New Radio (NR) communication system), or future communication systems.

[0037] exist Figure 1 In the communication system 100 shown, the network device 120 may be an access network device that communicates with the terminal device 110. The access network device may provide communication coverage for a specific geographical area, and may communicate with the terminal device 110 (eg, UE) located in the coverage area.

[0038] The network device 120 may be an evolved Node B (eNB or eNodeB) in a Long Term Evolution (LTE) system, or a Next Generation Radio Access Network (NG RAN) device, or a base station (gNB) in an NR system, or a wireless controller in a Cloud Radio Access Network (CRAN), or the network device 120 may be a relay station, an access point, a vehicle-mounted device, a wearable device, a hub, a switch, a bridge, a router, or a network device in a future evolved Public Land Mobile Network (PLMN), etc.

[0039] The terminal device 110 may be any terminal device, including but not limited to a terminal device connected to the network device 120 or other terminal devices by wire or wireless connection.

[0040] For example, the terminal device 110 may refer to an access terminal, a user equipment (UE), a user unit, a user station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user device. The access terminal 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 vehicle-mounted device, a wearable device, a terminal device in a 5G network, or a terminal device in a future evolution network, etc.

[0041] The terminal device 110 may be used for device-to-device (D2D) communication.

[0042] The wireless communication system 100 may also include a core network device 130 for communicating with the base station, and the core network device 130 may be a 5G core network (5G Core, 5GC) device, for example, an access and mobility management function (Access and Mobility Management Function, AMF), and for example, an authentication server function (Authentication Server Function, AUSF), and for example, a user plane function (User Plane Function, UPF), and for example, a session management function (Session Management Function, SMF). Optionally, the core network device 130 may also be an evolved packet core (Evolved Packet Core, EPC) device of the LTE network, for example, a session management function + a data gateway (Session Management Function + Core Packet Gateway, SMF + PGW-C) device of the core network. It should be understood that SMF + PGW-C can simultaneously implement the functions that SMF and PGW-C can implement. In the process of network evolution, the above-mentioned core network device may also be called other names, or a new network entity may be formed by dividing the functions of the core network, which is not limited to the embodiments of the present application.

[0043] The functional units in the communication system 100 may also establish connections through next generation (NG) network interfaces to achieve communication.

[0044] For example, the terminal device establishes an air interface connection with the access network device through the NR interface for transmitting user plane data and control plane signaling; the terminal device can establish a control plane signaling connection with the AMF through the NG interface 1 (N1 for short); the access network device, such as the next generation wireless access base station (gNB), can establish a user plane data connection with the UPF through the NG interface 3 (N3 for short); the access network device can establish a control plane signaling connection with the AMF through the NG interface 2 (N2 for short); the UPF can establish a control plane signaling connection with the SMF through the NG interface 4 (N4 for short); the UPF can exchange user plane data with the data network through the NG interface 6 (N6 for short); the AMF can establish a control plane signaling connection with the SMF through the NG interface 11 (N11 for short); the SMF can establish a control plane signaling connection with the PCF through the NG interface 7 (N7 for short).

[0045] Figure 1A base station, a core network device and two terminal devices are shown exemplarily. Optionally, the wireless communication system 100 may include multiple base station devices and each base station may include another number of terminal devices within its coverage area, which is not limited in the embodiments of the present application.

[0046] It should be understood that all devices with communication functions in the network / system in the embodiments of the present application can be referred to as communication devices. Figure 1 Taking the communication system 100 shown as an example, the communication equipment may include a network device 120 and a terminal device 110 with communication functions. The network device 120 and the terminal device 110 may be the devices described above and will not be repeated here. The communication equipment may also include other devices in the communication system 100, such as a network controller, a mobile management entity and other network entities, which is not limited in the embodiments of the present application.

[0047] It should be understood that the terms "system" and "network" are often used interchangeably in this article. The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0048] Figure 2 It is a schematic block diagram of the system framework 200 provided in an embodiment of the present application.

[0049] like Figure 2 As shown, the system framework 200 may include a visited network and a home network.

[0050] The access network may include terminal equipment, access network equipment, access and mobility management function (AMF), visit session management function (V-SMF) and user plane function (UPF). The access network may be a stand-alone non-public network (SNPN).

[0051] The home network may include unified data management (UDM) / home subscriber server (HSS), home session management function (H-SMF), user plane function (UPF), home policy control function (H-PCF), proxy call session control function (P-CSCF), serving call session control function (S-CSCF), technology-related RFS (TAS), interconnection border control function (IBCF) / border gateway control function (Border Gateway Control Function, BGCF) / media gateway control function (Media Gateway Control Function, MGCF) + media plane function, part B.

[0052] For example, the UDM / HSS may be connected to the TAS via the Sh interface, the TAS may be connected to the S-CSCF via the ISC interface, the UDM / HSS may be connected to the S-CSCF via the Cx interface, the H-PCF may be connected to the P-CSCF via the Rx or N5 interface, the P-CSCF may be connected to the S-CSCF via the Mw interface, and the UOF of the home network may be connected to the interconnection border control function (IBCF) / border gateway control function (BGCF) / media gateway control function (MGCF)+media plane function via the N6 interface. In addition, in the system 200, the control plane may be as follows: Figure 2 The dotted line shown passes through the P-CSCF and the S-CSCF, and the media plane may be a dotted line that does not pass through the P-CSCF and the S-CSCF.

[0053] Figure 3 1 shows a schematic flow chart of a wireless communication method 210 according to an embodiment of the present application, and the method 210 can be executed by a terminal device. For example, Figure 1 The terminal device shown.

[0054] like Figure 3 As shown, the method 210 may include:

[0055] S211, the terminal device receives first indication information, where the first indication information is used to indicate that the terminal device and the first PLMN can interact.

[0056] Through the first indication information, the terminal device and the first PLMN can interact with each other, which is equivalent to that, through the first indication information, the terminal device can access the IMS in the first PLMN, which not only enables the terminal device in the NPN to access the IMS, but also avoids the separate deployment of the IMS in the NPN, thereby reducing the network deployment cost and system complexity.

[0057] In some embodiments of the present application, the S211 may include:

[0058] During the non-public network NPN registration process, the terminal device receives the first indication information sent by the NPN access and mobility management function AMF.

[0059] In some embodiments of the present application, the S211 may include:

[0060] The terminal device receives a radio resource control RRC connection release message sent by a non-public network NPN access network device, the RRC connection release message includes the first indication information, and the RRC connection release message is used to indicate the release of the RRC connection between the terminal device and the NPN access network device.

[0061] In some embodiments of the present application, the RRC connection release message further includes second indication information, where the second indication information is used to indicate information of the first PLMN. Optionally, the first PLMN may be an identifier of the first PLMN.

[0062] In some embodiments of the present application, the method 210 may further include:

[0063] The terminal device initiates a registration process in the first PLMN;

[0064] The terminal device initiates a PDU session migration process to migrate a PDU session established based on a second PLMN in a non-public network NPN to the first PLMN, where the first PLMN and the second PLMN are the same or different.

[0065] Through the PDU session migration process, the AMF in the first PLMN can select the second SMF, thereby maintaining the SMF unchanged, and then maintaining the IP address unchanged. The second SMF can be the SMF under the second PLMN.

[0066] In some embodiments of the present application, the method 210 may further include:

[0067] The terminal device sends an uplink non-access layer transmission message to the first access and mobility management function AMF, and the uplink non-access layer transmission message includes request type information, and the request type information is used to indicate that the terminal device has established a PDU session in the NPN, and the first AMF is the AMF under the first PLMN.

[0068] In other words, the request type information can enable the AMF in the first PLMN to select the second SMF, thereby maintaining the SMF unchanged, and then maintaining the IP address unchanged. The second SMF can be the SMF under the second PLMN.

[0069] In some embodiments of the present application, the PDU session is used for a quality of service (QoS) flow of a voice service in an Internet Protocol Multimedia Service System (IMS), for example, a QoS flow with a 5G QoS Identifier (5QI) = 1.

[0070] Figure 4 A schematic flow chart of a wireless communication method 220 according to an embodiment of the present application is shown, and the method 220 may be executed by an access network device. For example, Figure 1 The access network equipment shown.

[0071] like Figure 4 As shown, the method 220 may include:

[0072] S221, a non-public network NPN access network device receives first indication information, where the first indication information is used to indicate that the terminal device and a first public land mobile network PLMN can interact with each other.

[0073] In some embodiments of the present application, the S221 may include:

[0074] During the non-public network NPN registration process, the NPN access network device receives the first indication information sent by the NPN access and mobility management function AMF.

[0075] In some embodiments of the present application, the S221 may include:

[0076] In the process of establishing a protocol data unit PDU session based on the second PLMN in the non-public network NPN, the NPN access network device receives the first indication information sent by the NPN access and mobility management function AMF, and the first PLMN and the second PLMN are the same or different.

[0077] In some embodiments of the present application, the PDU session is used for a quality of service QoS flow of a voice service in an Internet Protocol Multimedia Service System IMS.

[0078] In some embodiments of the present application, the method 220 may further include:

[0079] The NPN access network device sends a radio resource control RRC connection release message to the terminal device, the RRC connection release message includes the first indication information, and the RRC connection release message is used to indicate the release of the RRC connection between the terminal device and the NPN access network device.

[0080] In some embodiments of the present application, the RRC connection release message also includes second indication information, and the second indication information is used to indicate information of the first PLMN.

[0081] In some embodiments of the present application, the method 220 may further include:

[0082] The NPN access network device sends third indication information to the second session management function SMF, where the third indication information is used to indicate triggering a process pointing to the first PLMN, the second SMF is the SMF under the second PLMN, and the first PLMN and the second PLMN are the same or different.

[0083] For example, the NPN access network device sends a rejection message to the second SMF, where the rejection message is used to indicate a rejection of establishing a quality of service QoS flow for a voice service in an Internet Protocol Multimedia Service System IMS, and the rejection message includes the third indication information.

[0084] Figure 5 A schematic flow chart of a wireless communication method 230 according to an embodiment of the present application is shown, and the method 230 can be executed by a core network device. For example, Figure 1 The core network device shown. For example, the core network device may be a NPNAMF or a device with AMF.

[0085] like Figure 5 As shown, the method 230 may include:

[0086] S231, the NPN access and mobility management function AMF sends first indication information to the NPN access network device, where the first indication information is used to indicate that the terminal device and the first public land mobile network PLMN can interact.

[0087] In some embodiments of the present application, the S231 may include:

[0088] During the non-public network NPN registration process, the NPN AMF sends the first indication information to the terminal device and the NPN access network device respectively.

[0089] In some embodiments of the present application, the S231 may include:

[0090] In the process of establishing a protocol data unit (PDU) session based on the second PLMN in the non-public network NPN, the NPN AMF sends the first indication information to the NPN access network device, where the first PLMN and the second PLMN are the same or different.

[0091] Figure 6 A schematic flow chart of a wireless communication method 240 according to an embodiment of the present application is shown, and the method 240 can be executed by a core network device. For example, Figure 1 The core network device shown. For example, the core network device may be an SMF or a device having an SMF.

[0092] like Figure 6 As shown, the method 240 may include:

[0093] S241, the second session management function SMF receives the third indication information sent by the non-public network NPN access network device, and the third indication information is used to indicate the triggering process pointing to the first public land mobile network PLMN, the second SMF is the SMF under the second PLMN, and the first PLMN and the second PLMN are the same or different.

[0094] For example, the second SMF receives a send rejection message sent by the NPN access network device, where the rejection message is used to indicate a rejection of establishing a quality of service QoS flow for a voice service in an Internet Protocol Multimedia Service System IMS, and the rejection message includes the third indication information.

[0095] It should be understood that the above methods 210, 220, 230 and 240 may refer to corresponding steps, which will not be described again for the sake of brevity.

[0096] Figure 7 It is a schematic flowchart of the wireless communication method 300 provided in an embodiment of the present application.

[0097] like Figure 7 As shown, the method 300 may include some or all of the following:

[0098] S310, the terminal device registers in the NPN using the credentials of the second PLMN; the NPN AMF sends first indication information to the terminal device and the NPN access network device respectively.

[0099] For example, the terminal device initiates registration in the NPN, and uses the credentials of the second PLMN during the registration process. During the registration process, the AMF needs to notify the terminal device that it can interwork with the first PLMN, and notify the NPN access network device that the terminal device can interwork with the first PLMN. Optionally, the first PLMN and the second PLMN can be the same or different.

[0100] S320, the terminal device establishes a PDU session based on the second PLMN in the NPN for voice services in the IMS, and notifies the NPN access network device of the first indication information (if the NPN access network device is not notified in S310).

[0101] For example, the terminal device establishes a PDU session in the NPN, and the PDU session is used for voice services in the IMS. During the establishment process, the AMF needs to select the SMF in the second PLMN for the PDU session. During the PDU session establishment process, if the AMF has not notified the NPN access network device in S310 that the terminal device can interact with the first PLMN, the AMF will notify in S320.

[0102] S330: The second SMF triggers a PDU session modification procedure in the second PLMN to establish a QoS flow for the voice service in the IMS (eg, establishes a QoS flow with 5QI=1).

[0103] In other words, the second SMF initiates a PDU session modification process, the purpose of which is to establish a QoS flow for voice services in the IMS, such as a QoS flow with 5QI=1.

[0104] S340, the NPN access network device sends a rejection message to the second SMF.

[0105] For example, the NPN access network device rejects the request to establish a QoS flow for a voice service in the IMS, and notifies the second SMF to "redirect to the first PLMN process trigger (ongoing)".

[0106] S350, the NPN access network device sends an RRC connection release message (the identifier of the first PLMN) to the terminal device.

[0107] For example, the NPN access network device triggers an RRC release process and indicates at least the information of the first PLMN in an RRC release message. Optionally, the information of the first PLMN may be an identifier of the first PLMN.

[0108] S360, the terminal device is registered in the first PLMN; and the PDU session established in S320 is migrated to the first PLMN (by maintaining the SMF unchanged, the IP address can be maintained unchanged).

[0109] For example, according to the RRC connection release message, the terminal device can perform PLMN selection, that is, select the first PLMN, initiate a registration process in the first PLMN, and then migrate the PDU session established in S320 to the first PLMN. For example, the request type (RequestType) in the uplink non-access layer transmission (UL NAS TRANSPORT) message can be set to an existing PDU session (Existing PDU Session). Based on this, the AMF in the first PLMN can select the second SMF selected in S320, thereby maintaining the SMF unchanged, and then maintaining the IP address unchanged.

[0110] S370: The second SMF triggers, in the first PLMN, establishment of a QoS flow for voice services in the IMS (eg, establishment of a QoS flow with 5QI=1).

[0111] For example, the second SMF initiates a process of establishing a QoS flow for a voice service in the IMS, for example, a QoS flow with 5QI=1.

[0112] S380, completing the IMS signaling interaction.

[0113] Figure 8 It is a schematic flowchart of a wireless communication method 400 provided in an embodiment of the present application.

[0114] like Figure 8 As shown, the method 400 may include some or all of the following:

[0115] S410, the terminal device registers in the NPN using the credentials of the second PLMN; the NPN AMF sends first indication information to the NPN access network device.

[0116] For example, the terminal device initiates registration in the NPN, and uses the credentials of the second PLMN in the registration process. During the registration process, the AMF notifies the NPN access network device that the terminal device can interwork with the first PLMN. Optionally, the first PLMN and the second PLMN can be the same or different.

[0117] S420, the terminal device establishes a PDU session based on the second PLMN in the NPN for voice services in the IMS, and notifies the NPN access network device of the first indication information (if the NPN access network device is not notified in S410).

[0118] For example, the terminal device establishes a PDU session in the NPN, and the PDU session is used for voice services in the IMS. During the establishment process, the AMF needs to select the SMF in the second PLMN for the PDU session. During the PDU session establishment process, if the AMF has not notified the NPN access network device in S410 that the terminal device can interact with the first PLMN, the AMF will notify in S420.

[0119] S430: The second SMF triggers a PDU session modification procedure in the second PLMN to establish a QoS flow for the voice service in the IMS (eg, establishes a QoS flow with 5QI=1).

[0120] In other words, the second SMF initiates a PDU session modification process, the purpose of which is to establish a QoS flow for voice services in the IMS, such as a QoS flow with 5QI=1.

[0121] S440, the NPN access network device sends a rejection message to the second SMF.

[0122] For example, the NPN access network device rejects the request to establish a QoS flow for a voice service in the IMS, and notifies the second SMF to "redirect to the first PLMN process trigger (ongoing)".

[0123] S450, RRC connection release message (notifying the isolated device of the first indication information).

[0124] For example, the NPN access network device triggers an RRC release process, and indicates at least the information of the first PLMN in an RRC release message, and notifies the terminal device in the RRC release message that the terminal device can interwork with the first PLMN. Optionally, the information of the first PLMN can be an identifier of the first PLMN.

[0125] S460, the terminal device is registered in the first PLMN; and the PDU session established in S420 is migrated to the first PLMN (by maintaining the SMF unchanged, the IP address can be maintained unchanged).

[0126] For example, according to the RRC connection release message, the terminal device can perform PLMN selection, that is, select the first PLMN, initiate a registration process in the first PLMN, and then migrate the PDU session established in S420 to the first PLMN. For example, the request type (RequestType) in the uplink non-access layer transmission (UL NAS TRANSPORT) message can be set to an existing PDU session (Existing PDU Session), based on which the AMF in the first PLMN can select the second SMF selected in S420, thereby maintaining the SMF unchanged, and then maintaining the IP address unchanged.

[0127] S470: The second SMF triggers, in the first PLMN, establishment of a QoS flow for voice services in the IMS (eg, establishment of a QoS flow with 5QI=1).

[0128] For example, the second SMF initiates a process of establishing a QoS flow for a voice service in the IMS, for example, a QoS flow with 5QI=1.

[0129] S480: Complete the IMS signaling interaction.

[0130] The preferred embodiments of the present application are described in detail above in conjunction with the accompanying drawings. However, the present application is not limited to the specific details in the above embodiments. Within the technical concept of the present application, the technical solution of the present application can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present application. For example, the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present application will not further explain various possible combinations. For another example, the various different embodiments of the present application can also be arbitrarily combined, as long as they do not violate the ideas of the present application, they should also be regarded as the contents disclosed in the present application.

[0131] It should also be understood that in various method embodiments of the present application, the size of the sequence number of each process does not mean the order of execution, and 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 embodiment of the present application. In addition, in the embodiment of the present application, the terms "downlink" and "uplink" are used to indicate the transmission direction of the signal or data, wherein "downlink" is used to indicate that the transmission direction of the signal or data is a first direction sent from the site to the user equipment of the cell, and "uplink" is used to indicate that the transmission direction of the signal or data is a second direction sent from the user equipment of the cell to the site, for example, "downlink signal" indicates that the transmission direction of the signal is the first direction. In addition, in the embodiment of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. Specifically, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0132] Combination of the above Figures 1 to 8 , describes in detail the method embodiment of the present application, and the following is combined with Figures 9 to 13 , describe in detail the device embodiments of the present application.

[0133] Fig. 9 It is a schematic block diagram of a terminal device 500 according to an embodiment of the present application.

[0134] like Fig. 9 As shown, the terminal device 500 may include:

[0135] The communication unit 510 is used to receive first indication information, where the first indication information is used to indicate that the terminal device and a first public land mobile network PLMN can interact with each other.

[0136] In some embodiments of the present application, the communication unit 510 is specifically used to:

[0137] During the non-public network NPN registration process, the first indication information sent by the NPN access and mobility management function AMF is received.

[0138] In some embodiments of the present application, the communication unit 510 is specifically used to:

[0139] A radio resource control (RRC) connection release message sent by a non-public network (NPN) access network device is received, wherein the RRC connection release message includes the first indication information, and the RRC connection release message is used to indicate the release of the RRC connection between the terminal device and the NPN access network device.

[0140] In some embodiments of the present application, the RRC connection release message also includes second indication information, and the second indication information is used to indicate information of the first PLMN.

[0141] In some embodiments of the present application, the communication unit 510 is further configured to:

[0142] Initiating a registration procedure in the first PLMN;

[0143] A PDU session migration process is initiated to migrate a PDU session established based on a second PLMN in a non-public network NPN to the first PLMN, where the first PLMN and the second PLMN are the same or different.

[0144] In some embodiments of the present application, the communication unit 510 is further configured to:

[0145] An uplink non-access layer transmission message is sent to the first access and mobility management function AMF, wherein the uplink non-access layer transmission message includes request type information, and the request type information is used to indicate that the terminal device has established a PDU session in the NPN, and the first AMF is the AMF under the first PLMN.

[0146] In some embodiments of the present application, the PDU session is used for a quality of service QoS flow of a voice service in an Internet Protocol Multimedia Service System IMS.

[0147] Fig.10 It is a schematic block diagram of an NPN access network device 600 according to an embodiment of the present application.

[0148] like Fig.10 As shown, the NPN access network device 600 may include:

[0149] The communication unit 610 is used to receive first indication information, where the first indication information is used to indicate that the terminal device and a first public land mobile network PLMN can interact with each other.

[0150] In some embodiments of the present application, the communication unit is specifically used for:

[0151] During the non-public network NPN registration process, the first indication information sent by the NPN access and mobility management function AMF is received.

[0152] In some embodiments of the present application, the communication unit 610 is specifically used for:

[0153] In the process of establishing a protocol data unit PDU session based on the second PLMN in the non-public network NPN, the first indication information sent by the NPN access and mobility management function AMF is received, and the first PLMN and the second PLMN are the same or different.

[0154] In some embodiments of the present application, the PDU session is used for a quality of service QoS flow of a voice service in an Internet Protocol Multimedia Service System IMS.

[0155] In some embodiments of the present application, the communication unit 610 is further configured to:

[0156] A radio resource control (RRC) connection release message is sent to the terminal device, wherein the RRC connection release message includes the first indication information, and the RRC connection release message is used to indicate the release of the RRC connection between the terminal device and the NPN access network device.

[0157] In some embodiments of the present application, the RRC connection release message also includes second indication information, and the second indication information is used to indicate information of the first PLMN.

[0158] In some embodiments of the present application, the communication unit 610 is further configured to:

[0159] Send third indication information to the second session management function SMF, where the third indication information is used to indicate triggering a process pointing to the first PLMN, the second SMF is the SMF under the second PLMN, and the first PLMN and the second PLMN are the same or different.

[0160] In some embodiments of the present application, the communication unit 610 is specifically used for:

[0161] A rejection message is sent to the second SMF, where the rejection message is used to indicate a rejection of establishing a quality of service QoS flow for a voice service in an Internet Protocol Multimedia Service System IMS, and the rejection message includes the third indication information.

[0162] Fig.11 It is a schematic block diagram of the core network device 700 provided in an embodiment of the present application.

[0163] In some embodiments of the present application, the core network device 700 may be an NPN AMF or a device equipped with an AMF.

[0164] like Fig.11 As shown, the core network device 700 may include:

[0165] The communication unit 710 is used to send first indication information to the NPN access network device, where the first indication information is used to indicate that the terminal device and the first public land mobile network PLMN can interact with each other.

[0166] In some embodiments of the present application, the communication unit 710 is specifically used for:

[0167] During the non-public network NPN registration process, the first indication information is sent to the terminal device and the NPN access network device respectively.

[0168] In some embodiments of the present application, the communication unit 710 is specifically used for:

[0169] In the process of establishing a protocol data unit (PDU) session based on a second PLMN in a non-public network (NPN), the first indication information is sent to the NPN access network device, where the first PLMN and the second PLMN are the same or different.

[0170] In some embodiments of the present application, the core network device 700 may be an NPN SMF or a device equipped with SMF.

[0171] like Fig.11 As shown, the core network device 700 may include:

[0172] The communication unit 710 is used to receive a third indication information sent by a non-public network NPN access network device, where the third indication information is used to indicate a process for triggering a first public land mobile network PLMN, where the second SMF is an SMF under a second PLMN, and the first PLMN and the second PLMN are the same or different.

[0173] In some embodiments of the present application, the communication unit 710 is specifically used for:

[0174] A sending rejection message sent by the NPN access network device is received, where the rejection message is used to indicate a rejection of establishing a quality of service QoS flow for a voice service in an Internet Protocol Multimedia Service System IMS, and the rejection message includes the third indication information.

[0175] It should be understood that the device embodiment and the method embodiment may correspond to each other, and similar descriptions may refer to the method embodiment. For the sake of brevity, they will not be described in detail here.

[0176] The communication device of the embodiment of the present application is described above from the perspective of functional modules in conjunction with the accompanying drawings. It should be understood that the functional modules can be implemented in hardware form, can also be implemented by software instructions, and can also be implemented by a combination of hardware and software modules.

[0177] Specifically, each step of the method embodiment in the embodiment of the present application can be completed by the hardware integrated logic circuit and / or software instructions in the processor. The steps of the method disclosed in the embodiment of the present application can be directly reflected as being executed by a hardware decoding processor, or being executed by a combination of hardware and software modules in the decoding processor.

[0178] Optionally, the software module may be located in a mature storage medium in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps in the above method embodiment in combination with its hardware.

[0179] For example, the communication unit mentioned above may be implemented by a transceiver.

[0180] Fig.12 It is a schematic structural diagram of a communication device 800 according to an embodiment of the present application.

[0181] like Fig.12 As shown, the communication device 800 may include a processor 810 .

[0182] The processor 810 may call and run a computer program from the memory to implement the method in the embodiment of the present application.

[0183] Please continue to see Fig.12 , the communication device 800 may further include a memory 820 .

[0184] The memory 820 may be used to store indication information, and may also be used to store codes, instructions, etc. executed by the processor 810. The processor 810 may call and run a computer program from the memory 820 to implement the method in the embodiment of the present application. The memory 820 may be a separate device independent of the processor 810, or may be integrated in the processor 810.

[0185] Please continue to see Fig.12 , the communication device 800 may further include a transceiver 830 .

[0186] The processor 810 may control the transceiver 830 to communicate with other devices, specifically, to send information or data to other devices, or to receive information or data sent by other devices. The transceiver 830 may include a transmitter and a receiver. The transceiver 830 may further include an antenna, and the number of antennas may be one or more.

[0187] It should be understood that the various components in the communication device 800 are connected via a bus system, wherein the bus system includes not only a data bus but also a power bus, a control bus and a status signal bus.

[0188] It should also be understood that the communication device 800 may be a terminal device of the embodiment of the present application, and the communication device 800 may implement the corresponding processes implemented by the terminal device in each method of the embodiment of the present application, that is, the communication device 800 of the embodiment of the present application may correspond to the terminal device 500 in the embodiment of the present application, and may correspond to the corresponding subject in the method according to the embodiment of the present application, and for the sake of brevity, it will not be repeated here. Similarly, the communication device 800 may be the NPN access network device 600 or the core network device 700 of the embodiment of the present application, and may correspond to the corresponding subject in the method according to the embodiment of the present application, and for the sake of brevity, it will not be repeated here.

[0189] In addition, a chip is also provided in an embodiment of the present application.

[0190] For example, the chip may be an integrated circuit chip with signal processing capabilities, and can implement or execute the methods, steps, and logic diagrams disclosed in the embodiments of the present application. The chip may also be called a system-level chip, a system chip, a chip system, or a system-on-chip chip, etc. Optionally, the chip can be applied to various communication devices, so that the communication device equipped with the chip can execute the methods, steps, and logic diagrams disclosed in the embodiments of the present application.

[0191] Fig.13 is a schematic structural diagram of a chip 900 according to an embodiment of the present application.

[0192] like Fig.13 As shown, the chip 900 includes a processor 910 .

[0193] The processor 910 may call and run a computer program from the memory to implement the method in the embodiment of the present application.

[0194] Please continue to see Fig.13 , the chip 900 may further include a memory 920 .

[0195] The processor 910 may call and run a computer program from the memory 920 to implement the method in the embodiment of the present application. The memory 920 may be used to store indication information, and may also be used to store codes, instructions, etc. executed by the processor 910. The memory 920 may be a separate device independent of the processor 910, or may be integrated in the processor 910.

[0196] Please continue to see Fig.13 , the chip 900 may further include an input interface 930 .

[0197] The processor 910 may control the input interface 930 to communicate with other devices or chips, and specifically, may obtain information or data sent by other devices or chips.

[0198] Please continue to see Fig.13 , the chip 900 may further include an output interface 940 .

[0199] The processor 910 may control the output interface 940 to communicate with other devices or chips, and specifically, may output information or data to other devices or chips.

[0200] It should be understood that the chip 900 can be applied to the access network device in the embodiments of the present application, and the chip can implement the corresponding processes implemented by the access network device in the various methods of the embodiments of the present application, and can also implement the corresponding processes implemented by the terminal device or the core network device in the various methods of the embodiments of the present application. For the sake of brevity, it will not be repeated here.

[0201] It should also be understood that the various components in the chip 900 are connected via a bus system, wherein the bus system includes not only a data bus but also a power bus, a control bus and a status signal bus.

[0202] The processors mentioned above may include but are not limited to:

[0203] General-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, etc.

[0204] The processor can be used to implement or execute the methods, steps and logic block diagrams disclosed in the embodiments of the present application. The steps of the method disclosed in the embodiments of the present application can be directly embodied as a hardware decoding processor, or a combination of hardware and software modules in the decoding processor. The software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an erasable programmable memory, a register, etc. The storage medium is located in a memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0205] The memory mentioned above includes but is not limited to:

[0206] Volatile memory and / or non-volatile memory. Among them, the non-volatile memory can be read-only memory (ROM), programmable ROM (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM) or flash memory. The volatile memory can be 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 random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link DRAM (SLDRAM), and direct RAM bus random access memory (DR RAM).

[0207] It should be noted that the memory described herein is intended to include these and any other suitable types of memory.

[0208] In an embodiment of the present application, a computer-readable storage medium is further provided for storing a computer program. The computer-readable storage medium stores one or more programs, wherein the one or more programs include instructions, which, when executed by a portable electronic device including a plurality of application programs, enable the portable electronic device to perform the method of the method embodiment.

[0209] Optionally, the computer-readable storage medium can be applied to the network device in the embodiments of the present application, and the computer program enables the computer to execute the corresponding processes implemented by the network device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0210] Optionally, the computer-readable storage medium can be applied to the mobile terminal / terminal device in the embodiments of the present application, and the computer program enables the computer to execute the corresponding processes implemented by the mobile terminal / terminal device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0211] A computer program product is also provided in an embodiment of the present application, including a computer program.

[0212] Optionally, the computer program product can be applied to the network device in the embodiments of the present application, and the computer program enables the computer to execute the corresponding processes implemented by the network device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0213] Optionally, the computer program product can be applied to the mobile terminal / terminal device in the embodiments of the present application, and the computer program enables the computer to execute the corresponding processes implemented by the mobile terminal / terminal device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0214] The embodiment of the present application further provides a computer program. When the computer program is executed by a computer, the computer can execute the method of the method embodiment.

[0215] Optionally, the computer program can be applied to the network device in the embodiments of the present application. When the computer program runs on a computer, the computer executes the corresponding processes implemented by the network device in the various methods in the embodiments of the present application. For the sake of brevity, they are not described here.

[0216] In addition, the embodiment of the present application also provides a communication system, which may include the terminal device and the network device involved above to form a communication system as follows: Figure 1 The communication system 100 shown is not described in detail for the sake of brevity. It should be noted that the term "system" and the like in this document may also be referred to as "network management architecture" or "network system" and the like.

[0217] It should also be understood that the terms used in the embodiments of the present application and the appended claims are for the purpose of describing specific embodiments only and are not intended to limit the embodiments of the present application.

[0218] For example, as used in the embodiments of the present application and the appended claims, the singular forms "a," "said," "above," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0219] 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 to be beyond the scope of the embodiments of the present application.

[0220] If implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk.

[0221] Those skilled in the art can 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.

[0222] In several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways.

[0223] For example, the division of units or modules or components in the device embodiment described above is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or modules or components can be combined or integrated into another system, or some units or modules or components can be ignored or not executed.

[0224] For another example, the units / modules / components described above as separation / display components may or may not be physically separated, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units / modules / components may be selected according to actual needs to achieve the purpose of the embodiments of the present application.

[0225] Finally, it should be noted that the mutual coupling or direct coupling or communication connection shown or discussed above may be an indirect coupling or communication connection through some interfaces, devices or units, which may be electrical, mechanical or other forms.

[0226] The above contents are only specific implementation methods of the embodiments of the present application, but the protection scope of the embodiments of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the embodiments of the present application, which should be included in the protection scope of the embodiments of the present application. Therefore, the protection scope of the embodiments of the present application shall be based on the protection scope of the claims.

Claims

1. A wireless communication method, characterized in that: include: The non-public network NPN access network device receives first indication information, where the first indication information is used to indicate that the terminal device and the first public land mobile network PLMN can perform interactive work; The non-public network NPN access network device receives the first indication information, including: In the non-public network NPN registration process, the NPN access network device receives the first indication information sent by the NPN access and mobility management function AMF, and the registration process uses the credentials of the second PLMN; The NPN access network device sends a radio resource control RRC connection release message to the terminal device, and the RRC connection release message includes the first indication information, so that according to the RRC connection release message, the terminal device initiates a PDU session migration process to migrate the PDU session established based on the second PLMN in the non-public network NPN to the first PLMN process, the first PLMN and the second PLMN are the same or different, and the RRC connection release message is used to indicate the release of the RRC connection between the terminal device and the NPN access network device.

2. The method according to claim 1, characterized in that The non-public network NPN access network device receives the first indication information, including: In the process of establishing a protocol data unit PDU session based on the second PLMN in the non-public network NPN, the NPN access network device receives the first indication information sent by the NPN access and mobility management function AMF.

3. The method according to claim 2, characterized in that The PDU session is used for a quality of service QoS flow of a voice service in an Internet Protocol Multimedia Service System IMS.

4. The method according to claim 1, characterized in that: The RRC connection release message also includes second indication information, where the second indication information is used to indicate information of the first PLMN.

5. The method according to any one of claims 1 to 4, characterized in that The method further comprises: The NPN access network device sends third indication information to the second session management function SMF, where the third indication information is used to indicate triggering a process pointing to the first PLMN, and the second SMF is the SMF under the second PLMN.

6. The method according to claim 5, characterized in that The NPN access network device sends third indication information to the second session management function SMF, including: The NPN access network device sends a rejection message to the second SMF, where the rejection message is used to indicate a rejection of establishing a quality of service QoS flow for a voice service in an Internet Protocol Multimedia Service System IMS, and the rejection message includes the third indication information.

7. A wireless communication method, characterized in that: include: The non-public network NPN access and mobility management function AMF sends first indication information to the NPN access network device, where the first indication information is used to indicate that the terminal device and the first public land mobile network PLMN can interact; The non-public network NPN access and mobility management function AMF sends first indication information to the NPN access network device, including: During the non-public network NPN registration process, the NPN AMF sends the first indication information to the terminal device and the NPN access network device respectively, so that the terminal device can initiate a PDU session migration process to migrate the PDU session established based on the second PLMN in the non-public network NPN to the first PLMN. The registration process uses the credentials of the second PLMN, and the first PLMN and the second PLMN are the same or different.

8. The method according to claim 7, characterized in that The non-public network NPN access and mobility management function AMF sends first indication information to the NPN access network device, including: In the process of establishing a protocol data unit (PDU) session based on the second PLMN in the non-public network NPN, the NPN AMF sends the first indication information to the NPN access network device.

9. A wireless communication method, characterized in that: include: The second session management function SMF receives third indication information sent by the non-public network NPN access network device, where the third indication information is used to indicate triggering a process pointing to the first public land mobile network PLMN, where the second SMF is an SMF under the second PLMN, and the first PLMN and the second PLMN are the same or different; Wherein, during the non-public network NPN registration process, the NPN access network device receives the first indication information sent by the NPN access and mobility management function AMF, and the registration process uses the credentials of the second PLMN; The NPN access network device sends the third indication information to the second SMF; The NPN access network device sends a radio resource control RRC connection release message to the terminal device, and the RRC connection release message includes the first indication information, so that according to the RRC connection release message, the terminal device initiates a PDU session migration process to migrate the PDU session established based on the second PLMN in the non-public network NPN to the first PLMN. The RRC connection release message is used to indicate the release of the RRC connection between the terminal device and the NPN access network device.

10. The method according to claim 9, characterized in that The second session management function SMF receives third indication information sent by the non-public network NPN access network device, including: The second SMF receives a send rejection message sent by the NPN access network device, where the rejection message is used to indicate a rejection of establishing a quality of service QoS flow for a voice service in an Internet Protocol Multimedia Service System IMS, and the rejection message includes the third indication information.

11. An NPN access network device, characterized in that: include: A communication unit, configured to receive first indication information, wherein the first indication information is used to indicate that the terminal device and the first public land mobile network PLMN can perform interactive work; Wherein, the communication unit is specifically used for: In a non-public network NPN registration process, receiving the first indication information sent by the NPN access and mobility management function AMF, the registration process uses the credentials of the second PLMN; A radio resource control (RRC) connection release message is sent to the terminal device, wherein the RRC connection release message includes the first indication information, so that according to the RRC connection release message, the terminal device initiates a PDU session migration process to migrate a PDU session established based on a second PLMN in a non-public network (NPN) to the first PLMN, wherein the first PLMN and the second PLMN are the same or different, and the RRC connection release message is used to indicate the release of the RRC connection between the terminal device and the NPN access network device.

12. The NPN access network device according to claim 11, characterized in that: The communication unit is specifically used for: In the process of establishing a protocol data unit PDU session based on the second PLMN in a non-public network NPN, the first indication information sent by the NPN access and mobility management function AMF is received, and the first PLMN and the second PLMN are the same or different.

13. The NPN access network device according to claim 12, characterized in that: The PDU session is used for a quality of service QoS flow of a voice service in an Internet Protocol Multimedia Service System IMS.

14. The NPN access network device according to claim 11, characterized in that: The RRC connection release message also includes second indication information, where the second indication information is used to indicate information of the first PLMN.

15. The NPN access network device according to any one of claims 11 to 14, characterized in that: The communication unit is also used for: Send third indication information to the second session management function SMF, where the third indication information is used to indicate triggering a process pointing to the first PLMN, and the second SMF is the SMF under the second PLMN.

16. The NPN access network device according to claim 15, characterized in that: The communication unit is specifically used for: A rejection message is sent to the second SMF, where the rejection message is used to indicate a rejection of establishing a quality of service QoS flow for a voice service in an Internet Protocol Multimedia Service System IMS, and the rejection message includes the third indication information.

17. A core network device, characterized in that: include: A communication unit, configured to send first indication information to an NPN access network device, wherein the first indication information is used to indicate that the terminal device and the first public land mobile network PLMN can perform interactive work; Wherein, the communication unit is specifically used for: During the non-public network NPN registration process, the first indication information is sent to the terminal device and the NPN access network device respectively, so that the terminal device can initiate a PDU session migration process to migrate the PDU session established based on the second PLMN in the non-public network NPN to the first PLMN. The registration process uses the credentials of the second PLMN, and the first PLMN and the second PLMN are the same or different.

18. The core network device according to claim 17, characterized in that: The communication unit is specifically used for: In the process of establishing a protocol data unit (PDU) session based on the second PLMN in a non-public network (NPN), the first indication information is sent to the NPN access network device.

19. A core network device, characterized in that: include: A communication unit, configured to receive third indication information sent by a non-public network NPN access network device, wherein the third indication information is used to indicate triggering a process directed to a first public land mobile network PLMN; Wherein, during the non-public network NPN registration process, the NPN access network device receives the first indication information sent by the NPN access and mobility management function AMF, and the registration process uses the credentials of the second PLMN; The NPN access network device sends the third indication information to the second SMF, where the second SMF is the SMF under the second PLMN, and the first PLMN and the second PLMN are the same or different; The NPN access network device sends a radio resource control RRC connection release message to the terminal device, and the RRC connection release message includes the first indication information, so that according to the RRC connection release message, the terminal device initiates a PDU session migration process to migrate the PDU session established based on the second PLMN in the non-public network NPN to the first PLMN. The RRC connection release message is used to indicate the release of the RRC connection between the terminal device and the NPN access network device.

20. The core network device according to claim 19, characterized in that: The communication unit is specifically used for: A sending rejection message sent by the NPN access network device is received, where the rejection message is used to indicate a rejection of establishing a quality of service QoS flow for a voice service in an Internet Protocol Multimedia Service System IMS, and the rejection message includes the third indication information.

21. An NPN access network device, characterized in that: include: A processor, a memory and a transceiver, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method according to any one of claims 1 to 6.

22. A core network device, characterized in that: include: A processor, a memory and a transceiver, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method according to any one of claims 7 to 8 or the method according to any one of claims 9 to 10.

23. A chip, characterized in that: include: A processor, configured to call and run a computer program from a memory so that a device equipped with the chip executes the method according to any one of claims 1 to 6, the method according to any one of claims 7 to 8, or the method according to any one of claims 9 to 10.

24. A computer-readable storage medium, characterized in that: Used to store a computer program, the computer program causing a computer to execute the method of any one of claims 1 to 6, the method of any one of claims 7 to 8, or the method of any one of claims 9 to 10.

25. A computer program product, characterized in that The method comprises computer program instructions which cause a computer to perform the method of any one of claims 1 to 6, the method of any one of claims 7 to 8 or the method of any one of claims 9 to 10.

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