WO2022206514A1

WO2022206514A1 - Voice communication method and apparatus

Info

Publication number: WO2022206514A1
Application number: PCT/CN2022/082530
Authority: WO
Inventors: 朱强华; 时书锋
Original assignee: 华为技术有限公司
Priority date: 2021-04-01
Filing date: 2022-03-23
Publication date: 2022-10-06
Also published as: CN115190457A

Abstract

The present application provides a voice communication method. The method comprises: a first network element acquires the first internet protocol (IP) address of a terminal registered in a first network; the first network element sends first information to a second network element, the first information comprising a first IP address, the first IP address being an IP address related to the first connection of the terminal, the first connection being used for accessing an internet protocol multimedia subsystem (IMS); the first network element receives first instruction information from the second network element, the first instruction information being used for instructing the terminal to switch or redirect from the first network to a second network, the second network providing an IMS service for the terminal; the first network element acquires the second IP address of the terminal registered in the second network; the first network element establishes a second connection according to the first instruction information and the second IP address of the terminal, the second connection being used for the terminal to access the IMS. According to the method, a terminal acquires an IMS service, thereby the guaranteeing the service experience of a user.

Description

Method and apparatus for voice communication

This application claims the priority of the Chinese patent application with the application number 202110353978.6 and the application title "Method and Apparatus for Voice Communication" filed with the China Patent Office on April 01, 2021, the entire contents of which are incorporated into this application by reference.

technical field

The present application relates to the field of communications, and more particularly, to voice communication methods and apparatus.

Background technique

Currently, mobile networks that terminal devices can access include 2G, 3G, 4G and 5G networks, which provide service data transmission channels for UE's call services, video services, and web services. The Internet Protocol Multimedia Subsystem (IMS) is a brand-new multimedia service form, which can meet the needs of newer and more diversified multimedia services of current end customers. IMS network is a necessary Internet protocol for long term evolution (LTE) to realize the fusion of voice and multimedia data.

A standalone non-public network (SNPN) is deployed independently and does not depend on a public land mobile network (PLMN). At present, the IMS of the PLMN can provide IMS services for terminals accessing the SNPN.

However, when the SNPN does not have the ability to provide IMS voice, how the SNPN uses the IMS of the PLMN to provide the IMS service for the terminal device becomes a technical problem that needs to be solved at present.

SUMMARY OF THE INVENTION

The present application provides a voice communication method and device, which can realize that the SNPN uses the IMS of the PLMN to provide the IMS service to the terminal, so as to guarantee the service experience of the user.

A first aspect provides a voice communication method, the method comprising: a first network element acquiring a first Internet Protocol IP address of a terminal device registered in a first network; the first network element sending the first network element to a second network element; A piece of information, the first information includes a first IP address, the first IP address is an IP address related to the first connection of the terminal device, and the first connection is used to access the Internet Protocol Multimedia Subsystem IMS; the first network element Receive first indication information from the second network element, where the first indication information is used to instruct the terminal device to switch or redirect from the first network to a second network, and the second network passes the IMS provides IMS services for the terminal device; the first network element obtains the second IP address of the terminal device registered in the second network; the first network element obtains the second IP address of the terminal device according to the first indication information and the The second IP address of the terminal device establishes a second connection, where the second connection is used for the terminal device to access the IMS.

It should be understood that the first connection and the second connection in this application support the communication between the terminal device and the same communication peer. For example, the target port or target IP address of the first connection and the second connection are the same, and the target port or target IP address refers to the IP address and port of the communication peer of the terminal device. In this application, the first connection may be used to carry a multimedia IP stream.

Based on the above technical solutions, when the first network does not have the ability to provide IMS voice, the first network can switch or redirect the terminal device to the second network, so as to use the IMS of the second network to provide IMS services for the terminal device; The IMS call between the first network and the communication peer triggers the establishment of the first connection, and the first network element establishes the second connection for the terminal device according to the first indication information, without waiting for the terminal device to switch or redirect to the second network. The IMS call is performed with the communication peer to trigger the establishment of the second connection, which saves signaling and ensures the user's service experience.

With reference to the first aspect, in some implementations of the first aspect, the first network element establishes a second connection according to the first indication information and the second IP address of the terminal device, including: the first The network element saves the state information of the terminal device according to the first indication information, the state information includes second indication information, and the second indication information is used to instruct the terminal device to switch or redirect to the second network After that, the first network element establishes the second connection; when the first network element obtains the second IP address of the terminal device registered in the second network, the first network element The second indication information establishes the second connection.

Based on the above technical solutions, when the terminal device is switched or redirected to the second network, the first network element can re-establish the second connection to provide the terminal device with IMS services and ensure the user's service experience.

With reference to the first aspect, in some implementation manners of the first aspect, obtaining, by the first network element, the second IP address of the terminal device registered in the second network includes: the first network element obtains the second IP address of the terminal device through a registration message Obtain the second IP address of the terminal device, or; the first network element obtains the second IP address of the terminal device through a terminal device address change message.

Based on the above technical solutions, the first network element can flexibly obtain a new IP address of the terminal device, so as to re-establish the IMS connection later.

With reference to the first aspect, in some implementations of the first aspect, the first network is an independently deployed non-public network.

In conjunction with the first aspect, in some implementations of the first aspect, the second network is a public land mobile network.

With reference to the first aspect, in some implementations of the first aspect, the first network element is a proxy call control function network element in the IMS network.

With reference to the first aspect, in some implementations of the first aspect, the second network element is a policy control network element.

In a second aspect, a voice communication method is provided, the method comprising: a third network element determining third indication information according to a first condition, where the third indication information is used to indicate whether the first network supports the Internet Protocol Multimedia Subsystem IMS service, the first condition includes at least one of the following: whether the first network supports a home routing HR session with the second network, or; whether the first network and the second network have a common session management function network element and/or a common user plane function network element, or; whether the first network and the second network have a common proxy call control function network element, or; the first network and the second network whether there is a connection between the IMSs, wherein the second network provides the IMS service for the terminal equipment registered in the first network through the IMS; the third network element sends the terminal equipment the third indication information.

Based on the above technical solutions, the third network element judges whether the first network supports the Internet Protocol Multimedia Subsystem IMS service according to the first condition, and according to different judgment results, the UE can obtain the IMS service in different ways to ensure the user's service experience.

In this application, whether the first network supports the Internet Protocol Multimedia Subsystem IMS service includes whether the first network supports providing IMS services for UEs accessing the first network, or whether the first network supports using the IMS of the second network for accessing the first network. A UE of a network provides IMS services.

With reference to the second aspect, in some implementations of the second aspect, there is a connection between the first network and the IMS of the second network, and the first condition further includes: the first network and the IMS Whether the service level agreement SLA between the second networks supports the IMS service.

With reference to the second aspect, in some implementations of the second aspect, the first network is an independently deployed non-public network.

In conjunction with the second aspect, in some implementations of the second aspect, the second network is a public land mobile network.

With reference to the second aspect, in some implementations of the second aspect, the third network element is an access and mobility management function network element.

A third aspect provides a voice communication method, the method comprising: a terminal device receiving third indication information from a third network element in a first network, where the third indication information is used to indicate that the first network does not support Internet Protocol Multimedia Subsystem IMS service; the terminal device determines a second network according to the configuration information, and the second network provides IMS services for the terminal device through the IMS support, and the configuration information includes the priority of the candidate network, When there is a connection between the first candidate network and the IMS of the first network, and the first candidate network provides the IMS service for the terminal device, the first candidate network in the configuration information Priority is higher than that of other candidate networks.

Based on the above technical solutions, when the third network element determines that the first network does not support the Internet Protocol Multimedia Subsystem IMS service, the terminal device can select a network that supports the IMS service through network reselection, thereby ensuring user service experience.

With reference to the third aspect, in some implementations of the third aspect, the method further includes: updating, by the terminal device, configuration information, where the configuration information includes a network identifier of the first network and/or the third indication information.

With reference to the third aspect, in some implementations of the third aspect, the configuration information further includes a network identifier of the candidate network and/or fourth indication information, where the fourth indication information is used to indicate whether the candidate network supports IMS business.

Based on the above technical solutions, the terminal device may determine a candidate network supporting the IMS service according to the fourth indication information.

With reference to the third aspect, in some implementations of the third aspect, the first network is an independently deployed non-public network.

In conjunction with the third aspect, in some implementations of the third aspect, the second network is a public land mobile network.

With reference to the third aspect, in some implementations of the third aspect, the third network element is an access and mobility management function network element.

In a fourth aspect, a voice communication method is provided, the method comprising: a unified data management network element receiving second information from a session management function network element in a first network, the second information including an Internet Protocol Multimedia Subsystem IMS address information of the proxy call control function network element; the unified data management network element receives the first request from the session management function network element in the second network, and the second network is the first network through the IMS The terminal equipment registered in the IMS provides the IMS service; the unified data management network element sends a first response to the session management function network element in the second network, and the first response includes the proxy call control function network element address information.

Based on the above technical solution, the unified data management network element can send the address information of the proxy call control function network element to the session management function network element in the second network. When the terminal device is switched or redirected to the second network, the session management function network element The network element can obtain the address information of the proxy call control function network element and send it to the terminal device, so that the terminal device accessing the second network can re-access the proxy call control function network element and finally make the proxy call control function network element IMS services can be re-established.

With reference to the fourth aspect, in some implementations of the fourth aspect, the first network is an independently deployed non-public network.

In conjunction with the fourth aspect, in some implementations of the fourth aspect, the second network is a public land mobile network.

In a fifth aspect, a voice communication apparatus is provided, and the apparatus is configured to execute the voice communication method in the first aspect or any possible implementation manner of the first aspect.

In a sixth aspect, a voice communication apparatus is provided, and the apparatus is configured to execute the voice communication method in the second aspect or any possible implementation manner of the second aspect.

In a seventh aspect, a voice communication apparatus is provided, the apparatus is configured to execute the voice communication method in the third aspect or any possible implementation manner of the third aspect.

In an eighth aspect, a voice communication apparatus is provided, and the apparatus is configured to execute the voice communication method in the fourth aspect or any possible implementation manner of the fourth aspect.

In a ninth aspect, an embodiment of the present application provides a voice communication device, including a transceiver and a processor, where the transceiver and the processor are configured to implement the voice in the first aspect or any possible implementation manner of the first aspect communication method.

In a tenth aspect, an embodiment of the present application provides a voice communication device, including a transceiver and a processor, where the transceiver and the processor are used to implement the voice in the second aspect or any possible implementation manner of the second aspect communication method.

In an eleventh aspect, an embodiment of the present application provides a voice communication device, including a transceiver and a processor, where the transceiver and the processor are used to implement the third aspect or any one of the possible implementations of the third aspect. method of voice communication.

In a twelfth aspect, an embodiment of the present application provides a voice communication device, including a transceiver and a processor, where the transceiver and the processor are configured to implement the fourth aspect or any one of the possible implementations of the fourth aspect. method of voice communication.

A thirteenth aspect provides a processor, comprising: an input circuit, an output circuit, and a processing circuit. The processing circuit is configured to receive a signal through the input circuit and send a signal through the output circuit, causing an apparatus including the processor to perform any one of the first to fourth aspects and the first to fourth aspects method in one possible implementation.

In the specific implementation process, the above-mentioned processor may be one or more chips, the input circuit may be input pins, the output circuit may be output pins, and the processing circuit may be transistors, gate circuits, flip-flops and various logic circuits, etc. . The input signal received by the input circuit may be received and input by, for example, but not limited to, a transceiver, the signal output by the output circuit may be, for example, but not limited to, output to and transmitted by a transmitter, and the input circuit and output The circuit can be the same circuit that acts as an input circuit and an output circuit at different times. The embodiments of the present application do not limit the specific implementation manners of the processor and various circuits.

In a fourteenth aspect, a voice communication device is provided, including a processor and a memory. The processor is configured to read the instructions stored in the memory, and can receive signals through the transceiver and transmit signals through the transmitter, so as to execute the first aspect to the fourth aspect and any possible implementation manner of the first aspect to the fourth aspect method in .

Wherein, the processor is one or more, and the memory is one or more.

Wherein, the memory may be integrated with the processor, or the memory may be provided separately from the processor.

In the specific implementation process, the memory can be a non-transitory memory, such as a read only memory (ROM), which can be integrated with the processor on the same chip, or can be separately set in different On the chip, the embodiment of the present application does not limit the type of the memory and the setting manner of the memory and the processor.

It should be understood that the relevant data interaction process, such as sending indication information, may be a process of outputting indication information from the processor, and receiving capability information may be a process of receiving input capability information by the processor. Specifically, the data output by the processor can be output to the transmitter, and the input data received by the processor can be from the transceiver. Among them, the transmitter and the transceiver may be collectively referred to as a transceiver.

The voice communication device in the above fourteenth aspect may be one or more chips, or may also be a system of chips. The processor in the communication device can be implemented by hardware or software. When implemented by hardware, the processor can be a logic circuit, an integrated circuit, etc.; when implemented by software, the processor can be a general-purpose processor, implemented by reading software codes stored in a memory, which can Integrated in the processor, can be located outside the processor, independent existence.

A fifteenth aspect provides a chip, the chip includes a processor and a communication interface, the communication interface is used for communicating with an external device or an internal device, the processor is used for performing the first to fourth aspects and the first to fourth aspects. The method in any of the possible implementations of the fourth aspect

Optionally, the chip may further include a memory in which instructions are stored, and the processor is configured to execute the instructions stored in the memory or derived from other instructions. When the instructions are executed, the processor is configured to execute the method of the first aspect to the fourth aspect and any one of possible implementations of the first aspect to the fourth aspect

A sixteenth aspect provides a computer program product, the computer program product comprising: a computer program (which may also be referred to as code, or instructions), which, when the computer program is executed, causes the first aspect to the first aspect to be executed. The method in the fourth aspect and any possible implementation manner of the first aspect to the fourth aspect.

A seventeenth aspect provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program (also referred to as code, or instruction), when it is run on a computer, to cause the computer to execute the above-mentioned first A method in any one possible implementation of the aspect to the fourth aspect and the first aspect to the fourth aspect.

In an eighteenth aspect, a communication system is provided, including one or more devices having functions for implementing the methods and various possible designs of the above-mentioned first to fourth aspects.

Description of drawings

FIG. 1 is a system architecture diagram applicable to an embodiment of the present application.

FIG. 2 is a system architecture diagram applicable to the embodiment of the present application.

FIG. 3 is a schematic diagram of a scenario applicable to an embodiment of the present application.

FIG. 4 is a schematic flowchart of a voice communication method provided by an embodiment of the present application.

FIG. 5 is a schematic flowchart of a voice communication method provided by an embodiment of the present application.

FIG. 6 is a schematic flowchart of a voice communication method provided by an embodiment of the present application.

FIG. 7 is a schematic flowchart of a voice communication method provided by an embodiment of the present application.

FIG. 8 is a schematic flowchart of a voice communication method provided by an embodiment of the present application.

FIG. 9 is a schematic block diagram of a voice communication apparatus provided by an embodiment of the present application.

FIG. 10 is a schematic block diagram of a voice communication apparatus provided by an embodiment of the present application.

FIG. 11 is a schematic block diagram of a voice communication apparatus provided by an embodiment of the present application.

Detailed ways

Wireless communication systems to which the embodiments of the present application can be applied include, but are not limited to: global system of mobile communication (GSM) system, long term evolution (long term evolution, LTE) frequency division duplex (frequency division duplex, FDD) system , LTE time division duplex (TDD), LTE system, long-term evolution advanced (LTE-Advanced, LTE-A) system, next-generation communication system (eg, 5G, 6G communication system), multiple access systems Fusion system, or evolution system.

The technical solutions provided in this application can also be applied to machine type communication (MTC), Long Term Evolution-machine (LTE-M), and device to device (D2D) networks. , Machine to Machine (M2M) network, Internet of Things (IoT) network or other network. The IoT network may include, for example, the Internet of Vehicles. Among them, the communication methods in the Internet of Vehicles system are collectively referred to as vehicle to other devices (vehicle to X, V2X, X can represent anything), for example, the V2X may include: vehicle to vehicle (vehicle to vehicle, V2V) communication, vehicle and vehicle Infrastructure (V2I) communication, vehicle to pedestrian (V2P) or vehicle to network (V2N) communication, etc.

The terminal device involved in the embodiments of the present application is the portal for mobile users to interact with the network, and can provide basic computing capabilities and storage capabilities, display service windows to users, and accept user operation inputs. Terminal equipment in 5G can use new air interface technology to establish signal connection and data connection with wireless access network equipment, thereby transmitting control signals and service data to the mobile network. The terminal devices involved in the embodiments of the present application may include various access terminals, mobile devices, user terminals, or user equipment with wireless communication functions. For example, the terminal device may be a user equipment (UE), such as a mobile phone (mobile phone), a tablet computer (pad), a computer with a wireless transceiver function, a virtual reality (virtual reality, VR) terminal device, an augmented reality ( augmented reality, AR) terminal equipment, etc. The terminal equipment can also be a wireless terminal in industrial control (industrial control), a machine type communication (MTC) terminal, a customer terminal equipment (customer premise equipment, CPE), and a wireless terminal in self-driving (self-driving). , wireless terminal in remote medical, wireless terminal in smart grid, wireless terminal in transportation safety, wireless terminal in smart city, smart home ), cellular telephones, cordless telephones, session initiation protocol (SIP) telephones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld equipment, computing equipment or other processing equipment connected to a wireless modem, in-vehicle equipment, wearable equipment, terminal equipment in 5G networks or future evolution of public land mobile networks (PLMN) or non-public use networks ( non-public network, NPN) terminal equipment, etc.

The wireless access network equipment involved in the embodiments of this application is similar to the base station in the traditional network, and is deployed near the terminal equipment to provide network access functions for authorized users in a specific area, and to be able to access the network according to the user's level, service requirements, etc. Different quality transmission tunnels are determined to transmit user data. The wireless access network equipment can manage its own resources, utilize it rationally, provide access services for terminal equipment on demand, and is responsible for forwarding control signals and user data between the terminal equipment and the core network. The wireless access network device involved in the embodiment of the present application may be an access device that a terminal device wirelessly accesses to the mobile communication system. The radio access network equipment may be: a base station, an evolved node B (eNB), a home base station, an access point (AP) in a wireless fidelity (WiFi) system, a wireless relay Node, wireless backhaul node, transmission point (TP) or transmission and reception point (TRP), macro base station or micro base station, high frequency base station, etc. The radio access network device may also be a next generation node B (gNB) in the NR system, or may also be a component or a part of devices that constitute a base station, such as a central unit (CU), a distributed Unit (distributed unit, DU) or baseband unit (baseband unit, BBU) and so on. It should be understood that, in the embodiments of the present application, the specific technology and specific device form adopted by the wireless access network device are not limited. In this application, wireless access network equipment is referred to as network equipment for short. Unless otherwise specified, in this application, network equipment refers to wireless access network equipment. In this application, the network device may refer to the network device itself, or may be a chip applied in the network device to complete the wireless communication processing function.

The following describes the network system architecture related to the embodiments of the present application in detail with reference to FIG. 1 and FIG. 2 .

FIG. 1 is a system architecture diagram to which the embodiments of the present application are applied. As shown in the figure, the system architecture consists of terminal equipment, wireless access network equipment, core network and data network, wherein the terminal equipment, wireless access network (radio access network) network, RAN) and core network (core network, CN) are the main components of the architecture. Among them, the core network is responsible for maintaining the subscription data of the mobile network, managing the network elements of the mobile network, and providing functions such as session management, mobility management, policy management and security authentication for terminal devices. When the terminal device is attached, it provides network access authentication for the terminal device; when the terminal device has a service request, it allocates network resources to the terminal device; when the terminal device moves, it updates network resources for the terminal device; when the terminal device is idle, Provide a fast recovery mechanism for terminal equipment; release network resources for terminal equipment when terminal equipment is detached; provide data routing functions for terminal equipment when terminal equipment has service data, such as forwarding uplink data to data network; or from data The network receives the downlink data of the terminal device, forwards it to the radio access network, and then sends it to the UE. Logically, the system architecture can be divided into two parts: the user plane and the control plane. The control plane is responsible for the management of the mobile network, and the user plane is responsible for the transmission of service data. In Figure 1, the NG2 reference point is located between the radio access network control plane and the core network control plane, the NG3 reference point is located between the radio access network user plane and the core network user plane, and the NG6 reference point is located between the core network user plane and data between networks.

FIG. 2 is a system architecture diagram to which the embodiments of the present application are applicable. As shown in the figure, the network architecture may specifically include the following network elements:

1. Radio access network (RAN): An access network that implements access network functions based on wireless communication technology can be called a radio access network. The radio access network can manage radio resources, provide access services for terminals, and then complete the forwarding of control signals and user data between the terminal and the core network.

The wireless access network can be, for example, a base station (base transceiver station, BTS) in the global system of mobile communication (GSM) system or code division multiple access (CDMA), or a broadband code division A base station (nodeB, NB) in a wideband code division multiple access (WCDMA) system, an evolved base station (evolutional nodeB, eNB or eNodeB) in an LTE system, or a cloud radio access network (cloud radio access network (CRAN) scenario, or the network device can be a relay station, an access point, a vehicle-mounted device, a wearable device, a network device in a 5G network, or a network device in a future evolved PLMN network, etc. The embodiments of the present application are not limited.

2. Authentication server function (AUSF) network element: mainly used for user authentication, etc.

3. Access and mobility management function network element (access and mobility management function, AMF): mainly used for mobility management and access management, etc., and can be used to implement mobility management entity (mobility management entity, MME) functions Other functions than session management, such as lawful interception, or access authorization (or authentication) functions. In the embodiments of the present application, the functions of the access and mobility management network elements can be implemented.

4. Session management function network element (session management function, SMF): mainly used for session management, IP address allocation and management of terminal equipment, selection and management of user plane functions, policy control, or termination point of charging function interface and downlink data notice etc. In this embodiment of the present application, it can be used to implement the function of the session management network element.

5. Policy control function (PCF): a unified policy framework for guiding network behavior, providing policy rule information for control plane function network elements (such as AMF, SMF network elements, etc.).

6. Application function network element (application function, AF): used to perform data routing affected by applications, access network open function network elements, or interact with the policy framework to perform policy control, etc.

7. Unified data management (UDM): used for unified data management, 5G user data management, processing user identification, access authentication, registration, or mobility management, etc.

8. User plane function (UPF): It can be used for packet routing and forwarding, or quality of service (QoS) processing of user plane data. User data can be accessed to a data network (DN) through this network element. In this embodiment of the present application, it can be used to implement the function of the user plane network element.

9. Network slice selection function Network element (network slice selection function, NSSF): used to manage information related to network slices.

10. Digital network (DN): It is a data network that provides business services for terminal devices. Generally, the client is located in the terminal device, and the server is located in the data network. The data network may be a private network, such as a local area network, or an external network not controlled by an operator, such as the Internet (Internet), or a private network jointly deployed by operators, such as a network providing IMS services. That is, a data network is used to provide a network for transmitting data. For example, an operator's service network, an Internet (Internet) network, a third-party service network, and the like.

In addition, the above-mentioned network architecture may also include a network storage function (network function (NF) repository function, NRF): used to store the description information of the network function entities and the services they provide, and to support service discovery, network element entity discovery, etc. ; Network Exposure Function (NEF): used to securely open to the outside the services and capabilities provided by the 3rd Generation Partnership Project (3GPP) network function. Unified Data Repository (UDR) ), used for UDM to store user subscription data or read subscription data and PCF to store policy data or read policy data.

It should be understood that the above-mentioned network architecture applied to the embodiments of the present application is only a network architecture described from the perspective of a traditional point-to-point architecture and a service-oriented architecture, and the network architecture applicable to the embodiments of the present application is not limited thereto. Any network architecture capable of implementing the functions of the foregoing network elements is applicable to the embodiments of the present application. This application also does not limit the names of each network element in the described network architecture, and any network device capable of implementing the functions of each of the foregoing network elements is applicable to the embodiments of this application. In future communication systems such as 6G communication systems, the above-mentioned network elements or devices can still use the above-mentioned names, or have other names; the functions of the above-mentioned network elements or devices can be performed by an independent network element, or by several network elements This is done together, and this is not limited in the embodiments of the present application.

In actual deployment, network elements in the core network can be co-located. For example, access and mobility management function network elements can be co-located with session management function network elements; session management function network elements can be co-located with user plane function network elements; network slice selection function network elements, policy control network elements, and unified data Management NEs can be co-located. When two network elements are combined, the interaction between the two network elements provided in this embodiment of the present application becomes an internal operation of the combined network element or can be omitted.

For ease of understanding, some terms involved in this application are briefly described below.

1. Public land mobile network (PLMN), a network established and operated by the government or its approved operators for the purpose of providing land mobile communication services to the public. PLMN is a wireless communication system that tends to be oriented to mobile users on land such as vehicles or on foot. Such systems may be stand-alone, but are often linked to fixed telephone systems such as the public switched telephone network

2. Non-public network (NPN) is a network that is different from the public network of telecom operators and provides services for specific users/industry organizations. In the definition of 3GPP protocol TS23.501, there are the following two types of non-public networks type:

(1) An independently deployed NPN network (stand-alone NPN, SNPN), which does not depend on PLMN and is operated by SNPN operators (non-operator networks, such as government private networks, enterprise private networks).

(2) Non-independently deployed NPN network (public network integrated NPN, PNI-NPN), which relies on the public network (such as 5G network) and is operated by traditional operators.

3. Home routed (HR) roaming access: refers to a roaming user accessing a service provided by the home network through the gateway of the home network.

4. Local breakout (LBO) roaming access: The gateway for roaming user service access is the gateway of the visited network. Therefore, the policy control and charging policy of the home network need to be The home policy controls network element acquisition.

Currently, mobile networks that terminal devices can access include 2G, 3G, 4G, and 5G networks, which provide service data transmission channels for terminal devices' call services, video services, and web services. However, the explosive development of new services such as the Internet of Vehicles, virtual reality, mobile office, and the Internet of Things requires mobile networks to provide fiber-like access rates, a "zero" latency experience, and the ability to connect hundreds of billions of devices. Consistent services in multiple scenarios such as traffic density, ultra-high connection density, and ultra-high mobility, intelligent optimization of services and user perception, and over 100 times higher energy efficiency and over 100 times lower bit cost are the weaknesses of traditional networks. It cannot escort the rapid development of future business.

The IP multimedia subsystem (IMS) is a brand-new multimedia service form, which can meet the needs of more innovative and diversified multimedia services of current end customers. IMS enables various types of terminals to establish IP connections. Through this IP connection, terminals can transfer various information, including voice, pictures, videos, and files, to each other. At present, the PLMN network can provide IMS voice services to terminal equipment.

The embodiments of the present application are described by taking the first network as an SNPN and the second network as a PLMN as an example. FIG. 3 is a schematic diagram of a scenario to which this embodiment of the present application is applicable. FIG. 3 includes an SNPN network, a PLMN network, and an IMS network of the PLMN.

It should be noted that in this application, the PLMN and the SNPN can share the UDM, that is, the UE can use the subscription in the PLMN to register with the SNPN; the PLMN and the SNPN can also share the terminal identifier, for example, the subscription permanent identifier (SUPI); And the SNPN can use the IMS network of the PLMN.

For ease of understanding, the following briefly introduces the concepts or terms involved in the IMS network.

(1) Home subscriber server (HSS) is a core user database. It provides support for the entity in the IMS network that actually manages the calls. The HSS stores data related to users and services in the IMS network, including user identity, authentication data, service data, access parameters, service trigger information, and roaming information.

(2) call session control function network element (call session control function, CSCF): as the core part of the IMS CSCF is responsible for processing user multimedia sessions. According to the function, it can be divided into: proxy call control function network element (proxy CSCF, P-CSCF), interrogation call control function network element (Interrogation CSCF, I-CSCF) and serving call control function network element (Serving CSCF, S-CSCF) CSCF).

(3) P-CSCF: It is the interface network element between the IMS core network and the user terminal. It is responsible for user authentication, security mechanism negotiation, encryption protection, signaling compression and other functions related to the access network. The access terminal can also cooperate to complete the resource reservation function; cooperate with the I-CSCF/S-CSCF side to complete the call connection processing.

(4) I-CSCF: is the entry point of the IMS home network, selects a suitable S-CSCF for the incoming call of the P-CSCF in the home network, and provides access for the external IMS network of the visited network.

(5) S-CSCF: It is at the core of IMS network session control and is responsible for functions such as registration and authentication of terminals, session control, user service information management, and triggering specified services to an application server (AS).

(6) AS: Provide various business processing, for example, public switched telephone network emulation business, centralized user digital exchange business and so on.

(7) Media resource function controller (MRFC): parses resource control commands from S-CSCF and AS, and controls MRFP to provide media resources, such as three-party conference sound mixing, announcement sound, etc.

(8) Media resource function processor (MRFP): Provide media resources for terminals under the control of MRFC.

As mentioned above, a standalone non-public network (SNPN) is independently deployed and does not depend on a public land mobile network (PLMN) network. At present, the IMS of the PLMN can provide IMS services for terminals accessing the SNPN. However, when the SNPN does not have the ability to provide IMS voice, how the SNPN uses the IMS of the PLMN to provide the IMS service for the terminal device becomes a technical problem that needs to be solved at present.

The present application provides a voice communication method and device, which can realize that the SNPN uses the IMS of the PLMN to provide the IMS service to the terminal, so as to ensure the user experience.

It should be noted that, in order to facilitate understanding and description, the terminal device in this application takes the UE as an example.

As mentioned above, in this embodiment of the present application, the PLMN and the SNPN can share the UDM, that is, the UE can use the subscription in the PLMN to register with the SNPN; the PLMN and the SNPN can also share the terminal identity, such as SUPI; and the SNPN is allowed to use the PLMN's IMS network for IMS business. It can also be understood that the SNPN and the PLMN have a common P-CSCF network element.

FIG. 4 is a schematic flowchart of the voice communication method 400 of the present application. The method 400 shown in FIG. 4 may be performed by network elements such as AMF, SMF, UPF, UDM, and P-CSCF in the system shown in FIG. 2 or FIG. 3 . The method shown in FIG. 4 includes S401 to S405. In this embodiment, the terminal device is described by taking the UE as an example, and each step is described in detail below.

Step S401, the first network element obtains the first Internet Protocol IP address of the terminal device registered in the first network.

In a possible implementation manner, the first network element may be a P-CSCF network element, and the first network may be an SNPN. For example, the P-CSCF network element may acquire the multimedia registration information of the user equipment UE registered in the SNPN, and the registration information may include the first IP address of the UE.

Step S402, the first network element sends first information to the second network element, the first information includes a first IP address, the first IP address is an IP address related to the first connection of the terminal device, and the first connection is used to access the Internet Protocol Multimedia Subsystem IMS.

In a possible implementation manner, the second network element may be a PCF network element. For example, the P-CSCF network element may send application session information to the PCF, where the application session information includes a first IP address, the first IP address is the IP address related to the first connection of the terminal device, and the first connection is used to access the Internet Protocol Multimedia Subsystem System IMS. In this application, the first connection may be used for the terminal device to access the Internet Protocol Multimedia Subsystem IMS. Optionally, the application session information may further include at least one of the following: source port, destination port, and destination IP address. Here, the target port or target IP address refers to the port and IP address of the communication peer of the terminal device. In this application, the first connection may be used to bear a multimedia IP flow (IP Multimedia flow, IM flow).

In the present application, in the process of establishing an IMS session, the P-CSCF may establish the first connection when receiving a signaling providing a session description protocol (session description protocol offer, SDP offer). For example, when the P-CSCF receives a session initiation protocol (session initiation protocol, SIP) invite (invite) signaling, the P-CSCF may establish the first connection. Among them, SIP Invite signaling includes SDP offer. Exemplarily, for the process that the P-CSCF receives the SDP offer signaling to establish the first connection, please refer to Appendix B in TS 29.513.

It should be noted that when the SNPN and the PLMN do not have a common PCF, the second network element here can be the PCF in the SNPN; when the SNPN and the PLMN have a common PCF, the second network element here can refer to the common PCF; When both the SNPN and the PLMN have PCFs, the second network element here may refer to the PCF in the SNPN. For example, the P-CSCF network element sends the first information to the PCF in the SNPN through the PCF in the PLMN.

Step S403, the first network element receives first indication information from the second network element, the first indication information is used to instruct the terminal device to switch or redirect from the first network to the second network, and the second network provides the terminal device with the IMS.

In a possible implementation manner, the P-CSCF network element may receive the first indication information of the PCF network element, and the first indication information may be used to instruct the UE to be handed over or redirected from the SNPN to the PLMN. It can also be understood that the SNPN does not have the ability to provide IMS voice, and can provide IMS services for the UE with the help of the PLMN network.

Step S404, the first network element obtains the second IP address of the terminal device registered in the second network.

In a possible implementation manner, after the UE can be switched or redirected to the PLMN network, it can perform registration in the PLMN, and re-register or update information in the IMS network, thereby reporting a new IP address (for example, the second IP address). address).

The P-CSCF network element may obtain the second IP address of the UE through a registration message (eg, a Register message); in a possible implementation manner, the P-CSCF network element may obtain it through a UE address change message (eg, an invite message) The second IP address of the UE.

Step 405, the first network element establishes a second connection according to the first indication information and the second IP address of the terminal device.

In a possible implementation manner, the P-CSCF network element may re-establish a connection (for example, a second connection) in the PLMN according to the first indication information and the new IP address of the UE. In this application, the second connection may use Access the IMS from the terminal device. For example, after the P-CSCF network element obtains the new IP address of the UE, according to the first indication information, the P-CSCF network element may re-initiate the connection establishment request of the IMS voice to establish the second connection.

It should be understood that, in this application, the target ports or target IP addresses of the first connection and the second connection are the same. Here, the target port or target IP address refers to the port and IP address of the communication peer of the terminal device.

According to the method provided in the embodiment of the present application, when the SNPN does not have the capability of providing IMS voice, the UE can be switched or redirected to the PLMN network, and the terminal equipment can be provided with IMS services by means of the PLMN network; the terminal equipment is between the first network and the communication peer. The establishment of the first connection is triggered by an IMS call, and the first network element establishes a second connection for the terminal device according to the first indication information, without waiting for the terminal device to be switched or redirected to the second network to perform IMS again with the communication peer The call is triggered to establish the second connection, which saves signaling and ensures the user's service experience.

FIG. 5 is a schematic flowchart of a voice communication method 500 according to a specific embodiment of the present application. The method 500 shown in FIG. 5 can be performed by AMF, SMF, UPF, UDM and P- Executed by network elements such as CSCF. The method shown in FIG. 5 includes S501 to S512. In this embodiment, the terminal device is described by taking the UE as an example, and each step is described in detail below.

In this embodiment, the SNPN and the PLMN have a common P-CSCF network element, and the PLMN and the SNPN may not support the common (common) SMF or UPF or the home routed (HR) protocol data unit (protocol). data unit, PDU) session. That is to say, in this embodiment, the SNPN cannot use the SMF or UPF in the PLMN to establish the session when establishing the session, but can use the SMF/UPF in the SNPN network to establish the session. However, the AMF in the SNPN can determine that the SNPN supports the IMS service according to the configuration information or the indication information of the RAN. In this application, it can be understood that the SNPN supports the IMS service or service, and the SNPN can redirect or switch the terminal accessing the SNPN to use the IMS voice service in its PLMN. It can also be understood that the supporting IMS service includes that the first network supports providing IMS services for UEs accessing the first network, or the first network provides IMS services for UEs accessing the first network using the IMS of the second network.

Step S501, the UE uses the PLMN subscription to register with the SNPN network.

In a possible implementation manner, the UE can use the PLMN subscription to register with the SNPN network,

As an example, the UE may initiate a registration request to the SNPN AMF, and the AMF in the SNPN obtains the subscription data of the UE's PLMN from the UDM of the PLMN, and authenticates the UE according to the subscription data.

Step S502, the AMF determines whether the SNPN supports the IMS service.

Exemplarily, the AMF determines third indication information according to at least one of configuration information and indication information sent by the RAN (eg, base station) to the AMF, where the third indication information is used to indicate whether the SNPN supports the IMS service.

Exemplarily, the configuration information may include: local policy information, UE radio capabilities information, and roaming agreement information.

Exemplarily, the indication information of the RAN may include: information of the voice support match indicator (the voice support match indicator) of the RAN, which is used to indicate whether the RAN supports the IMS service.

The configuration information may also include at least one of the following: information on whether the SNPN supports the IMS connected to the PLMN, whether the SNPN supports HR roaming of IMS voice with the PLMN, whether there is a public network element (such as SMF) between the SNPN and the PLMN /UPF, etc.), whether there is a common P-CSCF between the SNPN and the PLMN. In this application, the SMF or UPF common to the SNPN and the PLMN may also be understood to mean that the SMF or the UPF is deployed in the PLMN and the SNPN at the same time, or can serve the PLMN and the SNPN at the same time. In this application, whether there is a common P-CSCF between the SNPN and the PLMN can be understood that the SNPN and the PLMN can be connected to the same P-CSCF network element in the IMS.

Exemplarily, the local policy information and/or roaming information may include at least one of the following: whether the SNPN supports IMS connected to the PLMN, whether the SNPN supports HR roaming for IMS voice between the SNPN and the PLMN, or whether the SNPN is connected to the PLMN. There is information such as public SMF or UPF or P-CSCF between them.

As an example, the AMF may determine whether the SNPN supports connecting to the IMS of the PLMN according to the roaming agreement, that is, determine whether the SNPN can access the IMS system of the PLMN. Further, the AMF determines that there is a connection between the SNPN and the IMS of the PLMN and the service level agreement SLA between the SNPN and the PLMN supports the IMS service, then the AMF determines that the SNPN supports the IMS connected to the PLMN.

It should be understood that when the UE uses the IMS service, there are certain requirements on the transmission instruction or transmission configuration of the RAN, for example, the base station must meet a specific design. Therefore, the AMF can also judge whether the access network equipment in the SNPN supports the transmission of the IMS service, that is, whether it has the capability to support the transmission of the IMS service. That is, the indication information is used to indicate whether the RAN is capable of transmitting IMS services. For example, the RAN can determine the Voice Support Match Indicator. That is, the RAN determines whether to support the transmission of IMS services.

It should be understood that the indication information of the RAN may be stored locally by the AMF or sent by the RAN to the AMF.

In this application, the RAN can also determine whether the RAN of the PLMN adjacent to the SNPN supports the IMS service.

As an example, if the RAN determines that the RAN of the PLMN adjacent to the SNPN supports IMS services, and the SNPN RAN supports handover or redirection of the UE to the RAN of the adjacent PLMN during the establishment of the QoS Flow of IMS Voice, the RAN sends the AMF Send indication information to indicate that the RAN supports the transmission of IMS services; or, if the RAN determines that IMS voice over PS session over NR is supported, the RAN sends indication information to the AMF, indicating that the RAN supports the transmission of IMS services; or, if the RAN does not support IMS voice over PS session When the UE is over NR and does not support switching or redirecting the UE to the PLMN during the establishment of the QoS Flow of IMS Voice, the RAN sends indication information to the AMF, indicating that the RAN does not support IMS services.

It should be understood that in this application, the RAN sends the indication information to the AMF, indicating that the RAN supports the transmission of IMS services. It may be that the RAN determines that the RAN currently serving the UE does not support the transmission of IMS services, but the SNPNRAN can switch or redirect the UE to the PLMN. Other RANs provide IMS services for the UE, and at this time, the RAN can send indication information to the AMF. Alternatively, the RAN determines that the current RAN supports IMS voice over PS session over NR, and at this time, the RAN can also send the indication information to the AMF.

Specifically, the judgment conditions of AMF in this application may include but are not limited to the following situations:

In a possible implementation manner, when the AMF determines according to the configuration information that the SNPN does not support the IMS connected to the PLMN and does not provide IMS, the AMF determines that the SNPN does not support the IMS service. For example, AMF determines that IMS Voice over PS Session Supported indication is not supported.

In a possible implementation manner, when the AMF determines according to the indication information of the access network device that the RAN does not support the transmission of the IMS service, the AMF determines that the SNPN does not support the IMS service. For example, AMF determines that IMS Voice over PS Session Supported indication is not supported.

In a possible implementation manner, when the AMF determines according to the configuration information that the SNPN supports the IMS connected to the PLMN, however, the AMF determines according to the indication information of the access network device that the RAN does not support the transmission of IMS services, then the AMF determines that the SNPN does not support IMS services . For example, AMF determines that IMS Voice over PS Session Supported indication is not supported.

In a possible implementation manner, when the AMF determines according to the configuration information that the SNPN supports IMS connected to the PLMN and the AMF determines that the RAN supports the transmission of IMS services according to the indication information of the access network device, the AMF determines that the SNPN supports IMS services. For example, AMF determines that IMS Voice over PS Session Supported indication is supported.

In a possible implementation manner, when the AMF determines according to the configuration information that the SNPN supports the IMS connected to the PLMN, and the AMF determines that the SNPN supports the IMS voice HR session with the PLMN, and the AMF determines the RAN according to the indication information of the access network device If the IMS service is supported, the AMF determines that the SNPN supports the IMS service. For example, AMF determines that IMS Voice over PS Session Supported indication is supported.

In a possible implementation manner, when the AMF determines according to the configuration information that the SNPN supports the IMS connected to the PLMN, the AMF determines that there is a common session management function network element and/or a common user plane function network element between the SNPN and the PLMN, and The AMF determines that the RAN supports the transmission of the IMS service according to the indication information of the access network device, and the AMF determines that the SNPN supports the IMS service. For example, AMF determines that IMS Voice over PS Session Supported indication is supported.

In a possible implementation manner, when the SNPN and the PLMN have a common P-CSCF network element, the AMF determines that the SNPN supports the IMS connected to the PLMN according to the configuration information, and the AMF determines that the RAN supports the transmission of IMS according to the indication information of the access network equipment. service, the AMF determines that the SNPN supports the IMS service. For example, AMF determines that IMS Voice over PS Session Supported indication is supported.

As described above, the scenario assumed in this embodiment may be that a common (common) SMF/UPF or a home routed (HR) protocol data unit (protocol data unit, PDU) session may not be supported between the PLMN and the SNPN , but there is a public P-CSCF network element, and the AMF in the SNPN can determine that the SNPN supports IMS services according to the configuration information and the RAN's indication information.

This embodiment assumes that the AMF determines that the SNPN supports the IMS service according to the configuration information and the indication information.

Step S503, the SNPN-AMF sends third indication information to the UE, where the third indication information is used to indicate that the SNPN supports the IMS service.

As an example, the UE receives a registration response (registration response) message sent by the SNPN-AMF; the message carries the IMS Voice over PS Session Supported indication, indicating that the SNPN supports the IMS service.

It should be noted that, if the AMF determines in step S502 that the SNPN does not support the IMS service, the SNPN-AMF in step S504 sends an indication that the SNPN does not support the IMS service to the UE. At this time, S504-S513 in this embodiment are not executed.

Step S504, the SNPN-SMF acquires the address information of the P-CSCF.

As an example, the UE may establish a PDU session,

The SNPN SMF can obtain the address information of the P-CSCF according to the network configuration. Exemplarily, the SNPN-SMF acquires the address of the P-CSCF in the process of establishing the PDU session, and reference may be made to section 4.3.2 of TS 23.502 of the 3GPP technical specification (TS), which will not be repeated here.

Step S505, the SNPN-SMF sends the address information of the P-CSCF to the UE and/or the UDM.

In a possible implementation, in step S505a, the SNPN-SMF sends a PDU session message to the UE, and the message carries the address information of the P-CSCF; in another possible implementation, in step S505b, the SMF sends Nudm_UECM_Registration to the UDM message, the message carries the address information of the P-CSCF. In another possible implementation manner, both S505a and S505b are performed.

Step S506, the UE registers in the IMS system of the PLMN.

For example, the UE may register in the IMS system according to the address information of the P-CSCF obtained in step S505. Exemplarily, the UE is registered in the IMS system of the PLMN, and reference may be made to 3GPP technical specification (technical specification, TS) TS 23.228.

It should be noted that, after the UE is registered in the IMS system, the P-CSCF may acquire the multimedia registration information of the UE, and the multimedia registration information includes the first Internet Protocol (IP) IP address of the UE.

Step S507, the IMS Voice connection establishment process of the UE.

In a possible implementation manner, the UE triggers the establishment of an IMS voice session, for example, a mobile orginated IMS voice call.

In a possible implementation manner, the network triggers the establishment of an IMS voice session, for example, a mobile terminated IMS voice call.

Step S508, the SNPN-SMF sends request #1 to the RAN, which is used to request the PDU session modification and create the QoS Flow of the IMS Voice.

Specifically, in a possible implementation manner, the P-CSCF sends first information (for example, application session information) to the PCF, where the first information includes a first IP address, and the first IP address is related to the first connection of the terminal device IP address, the first connection is used to access the Internet Protocol Multimedia Subsystem IMS. The PCF may forward the first information to the SMF. Then, the SNPN-SMF sends request #1 to the RAN for requesting PDU session modification and creating the QoS Flow of IMS Voice.

In this application, the first connection is used for the UE to access the Internet Protocol Multimedia Subsystem IMS. The first information may further include: source port and destination port. It can also be understood that the first information includes: the target IP address. Here, the target port or target IP address refers to the port and IP address of the communication peer of the terminal device.

In this application, in the process of establishing an IMS session, the P-CSCF may establish the first connection when receiving the signaling providing a session description protocol (session description protocol offer, SDP offer). For example, when the P-CSCF receives a session initiation protocol (session initiation protocol, SIP) invite (invite) signaling, the P-CSCF may establish the first connection. Among them, SIP Invite signaling includes SDP offer. Exemplarily, the P-CSCF receives the SDP offer and establishes the first connection, which may refer to Appendix B in 3GPP TS 29.513.

Optionally, in this step, when the SNPN-AMF forwards the request #1 to the RAN through the N2 message, it may indicate in the N2 message whether the SNPN-RAN can fall back the UE to the RAN in the PLMN, that is, whether PLMN Fallback is possible. Exemplarily, the SNPN-AMF may indicate in the N2 message whether the RAN in the SNPN system can fall back the UE to the RAN in the PLMN system when there is an N14 interface with the PLMN or when the AMF is shared with the PLMN.

Step S509, the RAN receives the request #1 of the SNPN-SMF, and determines whether to perform the PDU session modification process.

Specifically, the RAN can determine whether the PDU session modification process can be performed according to the UE's capability, local configuration and AMF indication.

In a possible implementation manner, the RAN in the SNPN does not have the capability of IMS Voice, but it can be determined that the UE can be handed over/redirected to the RAN in the PLMN according to the capability information of the UE and/or the characteristics of the RAN, etc., so rejecting PDU session modification request for SNPN-SMF. If the SNPN-AMF indicates that the UE can be dropped back to the PLMN, the RAN of the SNPN determines to handover the UE to the PLMN; otherwise, the RAN of the SNPN determines to redirect to the PLMN.

Step S510, the RAN sends a response #1 to the SNPN-SMF, which is used to instruct the RAN to reject the PDU session modification request of the SNPN-SMF, and to indicate that the IMS Voice Fallback is in progress.

It should be understood that in this step, the SNPN-SMF can also send a message #1 to the PCF, indicating that the IMS Voice Fallback is in progress; the PCF can forward the message #1 to the P-CSCF to notify the P-CSCF that the IMS Voice Fallback is in progress. It can also be understood that the PCF sends the first indication information to the P-CSCF, and the first indication information may be used to instruct the UE to switch from the SNPN or to be redirected to the PLMN. The P-CSCF receives the first indication information, and can save the state information, for example, the second indication information, the second indication information is used to instruct the P-CSCF to re-initiate the QoS of the IMS voice after the UE is switched or redirected to the second network Flow establishes a request (eg, a second connection). It can also be understood that when the UE moves to the target PLMN, the P-CSCF re-initiates the connection establishment request of the IMS voice.

Step S511, the RAN in the SNPN switches or redirects the UE to the PLMN.

In a possible implementation manner, the RAN may switch or redirect the UE to the PLMN. Exemplarily, the RAN in the SNPN may switch or redirect the UE to the PLMN by referring to Section 4.2.6 or Section 4.11.1.3 of 3GPP TS 23.502 .2.

When the UE is handed over or redirected to the PLMN, the SMF of the PLMN can determine the address information of the P-CSCF through the UE or the UDM. For example, the PDU session establishment or modification request message sent by the UE carries the address information of the P-CSCF obtained in step S505 to the SMF of the PLMN; or the UDM carries the address of the P-CSCF obtained in step S505 in the Nudm_UECM_Registration response message Information to the SMF of the PLMN.

Step S512, the UE obtains a new IP address and re-registers or updates in the IMS.

It should be noted that when the UE is switched or redirected to the PLMN, the session anchor of the UE changes, that is, the Internet Protocol (IP) address of the UE changes. At this time, the UE can re-register with the P-CSCF using the new IP address or notify the IMS of the new IP address of the UE. That is, the P-CSCF can acquire the second IP address of the UE.

In a possible implementation manner, the P-CSCF may obtain the second IP address of the UE through a registration message (eg, a Register message), or the P-CSCF may obtain the UE's second IP address through a UE address change message (eg, an Invite message). The second IP address.

Step S513, the P-CSCF re-initiates the connection establishment request of the IMS voice according to the first indication information received in step S510 and the second IP address of the UE.

For example, the P-CSCF may, according to the indication information of the PCF received in step S510, wait for the UE to move to the target PLMN and then re-initiate the connection establishment request of the IMS voice (for example, establish a second connection).

According to the method provided in this embodiment, the PLMN and the SNPN share the UDM and UE identity, and the UE in the SNPN can connect to the IMS system in the PLMN. During the establishment of the IMS service, the SNPN can redirect or switch the UE to the PLMN, IMS The P-CSCF in the PLMN can save the state information of the UE and assist the UE to restore the IMS service connection in the target PLMN, so that the SNPN can use the IMS in the PLMN to provide the IMS service to the UE and ensure the user experience.

FIG. 6 is a schematic flowchart of a method 600 provided by an embodiment of the present application. The method 600 shown in FIG. 6 may be implemented by a network such as AMF, SMF, UPF, UDM, and P-CSCF in the system shown in FIG. 2 or FIG. 3 . Meta execution. The method shown in FIG. 6 may include S601 to S612. In this embodiment, the terminal device is described by taking the UE as an example, and each step is described in detail below.

In this embodiment, HR sessions can be supported between the PLMN and the SNPN. Moreover, the AMF in the SNPN may determine that the SNPN supports the IMS service according to the configuration information or the indication information of the RAN.

It should be noted that, for steps S601 to S603, reference may be made to steps S501 to S503 in the method 500, and details are not repeated here.

In this embodiment, the HR session can be supported between the PLMN and the SNPN, that is, during the establishment of the PDU session of IMS Voice, the SNPN AMF can select SMF or UPF in the PLMN for the PDU session of IMS Voice.

Step S604, the SMF in the PLMN acquires the address information of the P-CSCF.

As an example, the UE may establish a PDU session, and the PLMN SMF may obtain the address information of the P-CSCF according to the local configuration. Exemplarily, for the SMF in the PLMN to obtain the address information of the P-CSCF, refer to Section 4.3.2 of the 3GPP Technical Specification (TS) TS 23.502, which is not repeated here.

Step S605, the address information of the P-CSCF sent by the SMF in the PLMN to the UE.

In a possible implementation manner, the SMF/UPF in the PLMN sends a PDU session message to the UE, and the message carries the address information of the P-CSCF to facilitate the UE to register in the IMS system.

Step S606, the UE registers in the IMS system of the PLMN

It should be understood that the UE can be registered in the IMS system of the PLMN according to the method in the prior art. Exemplarily, for the registration of the UE in the IMS system of the PLMN, reference may be made to 3GPP technical specification (TS) TS 23.228, which will not be repeated here.

For example, the UE may perform initial registration in the IMS system according to the address information of the P-CSCF obtained in step S605.

Step S607, the IMS Voice connection establishment process of the UE.

In a possible implementation manner, the UE triggers the establishment of a calling/called IMS voice session, for example, Mobile Orginated IMS voice call.

In a possible implementation manner, the network triggers the establishment of an IMS voice session, for example, Mobile Terminated IMS voice call.

Step S608, the SMF in the PLMN sends a request #1 to the SMF in the SNPN, which is used to request PDU session modification and create an IMS Voice QoS Flow, and the SMF in the SNPN forwards the request #1 to the RAN.

Optionally, in this step, the SNPN-AMF forwards the request #1 to the RAN through the N2 message, and can indicate in the N2 message whether the RAN in the SNPN can fall back the UE to the RAN in the PLMN. Optionally, in this step, when the SNPN-AMF forwards the request #1 to the RAN through the N2 message, it may indicate in the N2 message whether the SNPN-RAN can fall back (Fallback) to the RAN in the PLMN, that is, whether it can Do a PLMN Fallback. Exemplarily, the SNPN-AMF may indicate in the N2 message whether the RAN in the SNPN system can fall back the UE to the RAN in the PLMN system when there is an N14 interface with the PLMN or when the AMF is shared with the PLMN.

Step S609, the RAN receives the request #1 of the SMF of the SNPN, and determines whether the PDU session modification process can be performed. For details, refer to step S509 in the method 500 .

Step S610, the RAN sends a response #1 to the SMF of the SNPN, which is used to instruct the RAN to reject the PDU session modification request of the SNPNSMF, and to indicate that the IMS Voice Fallback is in progress, and the SMF of the SNPN forwards the response #1 to the SMF of the PLMN. It should be understood that in this step, the PLMN SMF can save the state information, and after the UE is redirected or switched to the PLMN, the SMF in the PLMN initiates a PDU session modification request in the PLMN to create an IMS Voice QoS Flow.

Step S611, the RAN switches or redirects the UE to the PLMN.

Exemplarily, the RAN switches or redirects the UE to the PLMN, which may refer to 3GPP TS 23.502. Section 4.2.6 or Section 4.11.1.3.2.

Step S612, the SMF in the PLMN re-establishes the IMS Voice QoS Flow in the PLMN.

In a possible implementation manner, the SMF in the PLMN can wait for the UE to move to the target PLMN, and then request to establish the QoS Flow of the IMS voice in the process of restoring the PDU session of the IMS voice in the PLMN. For example, after the AMF in the PLMN detects that the UE has moved to the target PLMN, the SMF can receive the message of restoring the PDU session sent by the AMF, and the SMF in the PLMN re-establishes the IMS Voice QoS Flow in the PLMN.

According to the method provided in this embodiment, the PLMN and the SNPN share the UDM and UE identity, and the UE in the SNPN can connect to the IMS system in the PLMN, establish an HR session for the UE accessing the SNPN, and reset the UE when the IMSVoice QoS Flow is established. Orientation or handover to PLMN enables the SNPN to provide IMS services to the UE by means of the IMS in the PLMN to ensure user experience.

FIG. 7 is a schematic flowchart of a method 700 provided by an embodiment of the present application. The method 700 shown in FIG. 7 may be implemented by a network such as AMF, SMF, UPF, UDM, and P-CSCF in the system shown in FIG. 2 or FIG. 3 . Meta execution. The voice communication method shown in FIG. 7 includes S701 to S712. In this embodiment, the terminal device is described by taking the UE as an example, and each step is described in detail below.

In this embodiment, a common SMF/UPF can be supported between the PLMN and the SNPN to serve the PDU session of the IMS. Moreover, the AMF in the SNPN may determine that the SNPN supports the IMS service according to the configuration information or the indication information of the RAN.

It should be noted that, for steps S701 to S703, reference may be made to steps S501 to S503 in the method 500, and details are not repeated here.

Step S704, the public SMF/UPF acquires the address information of the P-CSCF.

As an example, in the process of establishing a PDU session by the UE, the SNPN AMF selects a public SMF/UPF to serve the PDU session. The public SMF/UPF can obtain the address information of the P-CSCF according to the local configuration. Exemplarily, for the public SMF/UPF to obtain the address information of the P-CSCF, reference may be made to Section 4.3.2 of TS 23.502 of the 3GPP Technical Specification (TS), which will not be repeated here.

Step S705, the address information of the P-CSCF sent by the public SMF/UPF to the UE.

In a possible implementation manner, the public SMF/UPF sends a PDU session message to the UE, and the message carries the address information of the P-CSCF to facilitate the UE to register in the IMS system.

Step S706, the UE registers in the IMS system of the PLMN.

For example, the UE may perform initial registration in the IMS system according to the address information of the P-CSCF obtained in step S705. Exemplarily, for the registration of the UE in the IMS system of the PLMN, reference may be made to 3GPP technical specification (TS) TS 23.228, which will not be repeated here.

Step S707, the IMSVoice connection establishment process of the UE.

Specifically, reference may be made to step S607 in the reference method 600 .

Step S708, the public SMF/UPF sends request #1 to the RAN for requesting PDU session modification and creating an IMS Voice QoS Flow.

Optionally, in this step, the SNPN-AMF forwards the request #1 to the RAN through the N2 message, and can indicate in the N2 message whether the RAN in the SNPN can fall back the UE to the RAN in the PLMN. Optionally, in this step, when the SNPN-AMF forwards the request #1 to the RAN through the N2 message, it may indicate in the N2 message whether the SNPN-RAN can fall back the UE to the RAN in the PLMN, that is, whether PLMN Fallback is possible. Exemplarily, the SNPN-AMF may indicate in the N2 message whether the RAN in the SNPN system can fall back the UE to the RAN in the PLMN system when there is an N14 interface with the PLMN or when the AMF is shared with the PLMN.

Step S709, the RAN receives the request #1 of the public SMF/UPF, and determines whether the PDU session modification process can be performed. For details, refer to step S509 in the method 500 .

Step S710, the RAN sends a response #1 to the public SMF/UPF, which is used to instruct the RAN to reject the PDU session modification request of the public SMF/UPF, and to indicate that the IMS Voice Fallback is in progress. It should be understood that in this step, the public SMF/UPF can save the state information, and after the UE is redirected or switched to the PLMN, the public SMF/UPF initiates a PDU session modification in the PLMN to create an IMS Voice QoS Flow.

Step S711, the RAN switches or redirects the UE to the PLMN.

Step S712, the public SMF/UPF re-establishes the IMS Voice QoS Flow in the PLMN.

In a possible implementation manner, the public SMF/UPF can wait for the UE to move to the target PLMN, and then request to establish the QoS Flow of the IMS voice in the process of restoring the PDU session of the IMS voice in the PLMN. For example, after the AMF in the PLMN detects that the UE has moved to the target PLMN, the public SMF/UPF can receive the message of restoring the PDU session sent by the AMF, and the public SMF/UPF re-establishes the IMS Voice QoS Flow in the PLMN.

According to the method provided in this embodiment, the PLMN and the SNPN share the UDM and UE identity, and have a common SMF and UPF, and the UE in the SNPN can connect to the IMS system in the PLMN, and select the common IMS PDU session for the UE accessing the SNPN. SMF/UPF redirects or switches the UE to the PLMN when requesting to establish an IMSVoice QoS Flow, so that the SNPN can use the IMS in the PLMN to provide IMS services to the UE, ensuring user experience.

FIG. 8 is a schematic flowchart of a method 800 provided by an embodiment of the present application. The method 800 shown in FIG. 8 may be implemented by a network such as AMF, SMF, UPF, UDM, and P-CSCF in the system shown in FIG. 2 or FIG. 3 . Meta execution. The method shown in FIG. 8 may include S801 to S804. In this embodiment, the terminal device is described by taking the UE as an example, and each step is described in detail below.

In this embodiment, the AMF in the SNPN determines that the SNPN does not support the IMS service according to the configuration information or the indication information of the RAN.

Step S801, the UE uses the PLMN subscription to register with the SNPN network.

For details, refer to step S501 in the method 500, which will not be repeated.

Step S802, the AMF determines whether the SNPN supports the IMS service.

In a possible implementation manner, when the AMF determines according to the configuration information that the SNPN does not support the IMS connected to the PLMN and does not support the IMS itself, that is, the UE in the SNPN cannot access the IMS network, then the AMF determines that the SNPN does not support the IMS service. . For example, AMF determines that IMS Voice over PS Session Supported indication is not supported.

In a possible implementation manner, when the AMF determines that the RAN does not support the IMS service according to the indication information of the access network device, the AMF determines that the SNPN does not support the IMS service. For example, AMF determines that IMS Voice over PS Session Supported indication is not supported.

In a possible implementation, when the AMF determines that the SNPN supports IMS connected to the PLMN according to the configuration information, and the AMF determines that the RAN does not support the transmission of IMS services according to the indication information of the access network device, the AMF determines that the SNPN does not support IMS services. For example, AMF determines that IMS Voice over PS Session Supported indication is not supported.

For the configuration information and the indication information of the RAN in this embodiment, reference may be made to the description of S502. This embodiment assumes that the AMF determines that the SNPN does not support the IMS service according to the configuration information and the indication information of the RAN.

Step S803, the SNPN-AMF sends third indication information to the UE, where the third indication information is used to indicate that the SNPN does not support the IMS service.

As an example, the UE receives a registration response (registration response) message sent by the SNPN-AMF; the message carries IMS Voice over PS Session Supported indication, indicating that the SNPN does not support IMS services.

Step S804, the UE selects a network supporting the provision of the IMS service according to the configuration information.

When the AMF determines that the SNPN does not support the IMS service, the UE may select a network that supports the provision of the IMS service according to the configuration information. In this application, the configuration information includes multiple candidate networks. When there is a connection between the first candidate network and the IMS of the SNPN, and the first candidate network provides IMS services for the UE, the priority of the first candidate network is higher than that of the other candidates. network priority. It can also be understood that when the AMF determines that the SNPN does not support the IMS service, the UE needs to select another SNPN or PLMN that supports the IMS service to access. Optionally, the UE may preferentially select PLMN access and use IMS services.

In a possible implementation manner, the UE may update configuration information, where the configuration information includes the network identifier of the SNPN and/or the third indication information.

In a possible implementation manner, the configuration information in this application may further include a network identifier of the candidate network and/or fourth indication information, where the fourth indication information is used to indicate whether the candidate network supports IMS services.

According to the method provided by this embodiment, the UE is allowed to re-selection through the network when the SNPN is registered, so that the SNPN uses the IMS in the PLMN to provide the IMS service to the UE, and the user experience is guaranteed.

The methods provided by the embodiments of the present application are described in detail above with reference to FIGS. 4 to 8 . The following describes the voice communication apparatus provided by the embodiments of the present application with reference to FIG. 9 to FIG. 11 . It should be understood that the description of the apparatus embodiment corresponds to the description of the method embodiment. Therefore, for the content not described in detail, reference may be made to the above method embodiment, which is not repeated here for brevity.

The foregoing mainly introduces the solutions provided by the embodiments of the present application from the perspective of interaction between various network elements. It can be understood that, in order to implement the above-mentioned functions, each network element includes corresponding hardware structures and/or software modules for performing each function. Those skilled in the art should realize that the present application can be implemented in hardware or a combination of hardware and computer software with the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein. Whether a function is performed by hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

In this embodiment of the present application, the transmitting-end device or the receiving-end device may be divided into functional modules according to the foregoing method examples. For example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. middle. The above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules. It should be noted that, the division of modules in the embodiments of the present application is schematic, and is only a logical function division, and there may be other division manners in actual implementation. The following description will be given by taking as an example that each function module is divided corresponding to each function.

FIG. 9 is a schematic block diagram of a voice communication apparatus 100 provided by an embodiment of the present application. As shown in the figure, the voice communication apparatus 100 may include: a transceiver unit 110 and a processing unit 120 .

In a possible design, the voice communication apparatus 100 may be the P-CSCF network element in the above method embodiment, or may be a chip for implementing the function of the P-CSCF network element in the above method embodiment. It should be understood that the voice communication device 100 may correspond to the first network element or the P-CSCF network element in the methods 400 and 500 according to the embodiments of the present application, and the voice communication device 100 may execute the methods 400 and 500 of the embodiments of the present application. Steps corresponding to the first network element or the P-CSCF network element in the method 500 . It should be understood that the specific process of each unit performing the above-mentioned corresponding steps has been described in detail in the above-mentioned method embodiments, and for the sake of brevity, it will not be repeated here.

In a possible design, the voice communication apparatus 100 may be the AMF network element in the above method embodiment, or may be a chip for implementing the function of the AMF network element in the above method embodiment. It should be understood that the voice communication device 100 may correspond to the AMF network elements in the methods 400, 500, 600, 700, and 800 according to the embodiments of the present application, and the voice communication device 100 may execute the methods of the embodiments of the present application Steps corresponding to the AMF network elements in 400, method 500, method 600, method 700, and method 800. It should be understood that the specific process of each unit performing the above-mentioned corresponding steps has been described in detail in the above-mentioned method embodiments, and for the sake of brevity, it will not be repeated here.

In a possible design, the voice communication apparatus 100 may be a terminal device (eg, user equipment UE) in the above method embodiments, or may be a chip for implementing the functions of the terminal device in the above method embodiments . It should be understood that the voice communication apparatus 100 may correspond to the terminal device in the method 400, the method 500, the method 600, the method 700, and the method 800 according to the embodiments of the present application, and the voice communication apparatus 100 may execute the method 400 of the embodiments of the present application. , the steps corresponding to the terminal equipment in the method 500 , the method 600 , the method 700 and the method 800 . It should be understood that the specific process of each unit performing the above-mentioned corresponding steps has been described in detail in the above-mentioned method embodiments, and for the sake of brevity, it will not be repeated here.

In a possible design, the voice communication apparatus 100 may be the UDM network element in the above method embodiment, or may be a chip for implementing the function of the UDM network element in the above method embodiment. It should be understood that the voice communication apparatus 100 may correspond to the UDM network element in the method 500 according to the embodiment of the present application, and the voice communication apparatus 100 may execute the steps corresponding to the UDM network element in the method 500 of the embodiment of the present application. It should be understood that the specific process of each unit performing the above-mentioned corresponding steps has been described in detail in the above-mentioned method embodiments, and for the sake of brevity, it will not be repeated here.

It should also be understood that when the voice communication device 100 is a chip, the chip includes a transceiver unit and a processing unit. Wherein, the transceiver unit may be an input/output circuit or a communication interface; the processing unit may be a processor, a microprocessor or an integrated circuit integrated on the chip. The transceiving unit 110 is used to implement the transceiving operation of the signal of the voice communication apparatus 100 , and the processing unit 120 is used to implement the processing operation of the signal of the voice communication apparatus 100 . Optionally, the voice communication apparatus 100 further includes a storage unit 130, and the storage unit 130 is used for storing instructions.

The embodiment of the present application further provides an access network device, as shown in FIG. 10 . The apparatus 1000 includes one or more radio frequency units, such as a remote radio unit (RRU) 1010 and one or more baseband units (BBU) (also referred to as digital units, digital units, DU) 1020 . The RRU 1010 may be called a transceiver module, and the transceiver module may include a sending module and a receiving module, or the transceiver module may be a module capable of transmitting and receiving functions. The transceiver module may correspond to the transceiver unit 110 in FIG. 9 . Optionally, the transceiver module may also be referred to as a transceiver, a transceiver circuit, or a transceiver, etc., which may include at least one antenna 1011 and a radio frequency unit 1012 . The part of the RRU 1010 is mainly used for transmitting and receiving radio frequency signals and conversion of radio frequency signals and baseband signals, for example, for sending indication information to terminal equipment. The part of the BBU 1020 is mainly used to perform baseband processing, control the base station, and the like. The RRU 1010 and the BBU 1020 may be physically set together, or may be physically separated, that is, a distributed base station.

The BBU 1020 is the control center of the base station, and can also be referred to as a processing module, which can correspond to the processing unit 120 in FIG. 9 , and is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, spread spectrum, and the like. For example, the BBU (processing module) may be used to control the base station to perform the operation procedure of the network device in the foregoing method embodiments, for example, to generate the foregoing indication information and the like.

In an example, the BBU 1020 may be composed of one or more boards, and the multiple boards may jointly support a wireless access network (such as an LTE network) of a single access standard, or may respectively support a wireless access network of different access standards. Radio access network (such as LTE network, 5G network or other network). The BBU 1020 also includes a memory 1021 and a processor 1022. The memory 1021 is used to store necessary instructions and data. The processor 1022 is configured to control the base station to perform necessary actions, for example, to control the base station to perform the operation flow of the network device in the foregoing method embodiments. The memory 1021 and the processor 1022 may serve one or more single boards. That is to say, the memory and processor can be provided separately on each single board. It can also be that multiple boards share the same memory and processor. In addition, necessary circuits may also be provided on each single board.

FIG. 11 is a schematic block diagram of a voice communication apparatus 200 provided by an embodiment of the present application. As shown in the figure, the communication apparatus 200 includes: at least one processor 220 . The processor 220 is coupled to the memory for executing instructions stored in the memory to transmit and/or receive signals. Optionally, the communication apparatus 200 further includes a memory 230 for storing instructions. Optionally, the communication apparatus 200 further includes a transceiver 210, and the processor 220 controls the transceiver 210 to send and/or receive signals.

It should be understood that the above-mentioned processor 220 and the memory 230 may be combined into one processing device, and the processor 220 is configured to execute the program codes stored in the memory 230 to realize the above-mentioned functions. During specific implementation, the memory 230 may also be integrated in the processor 220 or independent of the processor 220 .

It should also be understood that transceiver 210 may include a receiver (or, receiver) and a transmitter (or, transmitter). The transceiver may further include antennas, and the number of the antennas may be one or more. Transceiver 210 may be a communication interface or interface circuit.

Specifically, the transceiver 210 in the voice communication device 200 may correspond to the transceiver unit 110 in the voice communication device 100 , and the processor 220 in the voice communication device 200 may correspond to the processing unit 120 in the voice communication device 200 .

It should be understood that the specific process of each transceiver processor performing the above-mentioned corresponding steps has been described in detail in the above-mentioned method embodiments, and for the sake of brevity, it will not be repeated here.

In the implementation process, each step of the above-mentioned method can be completed by a hardware integrated logic circuit in a processor or an instruction in the form of software. The steps of the methods disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware processor, or executed by a combination of hardware and software modules in the processor. The software modules may be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other storage media mature in the art. The storage medium is located in the memory, and the processor reads the information in the memory, and completes the steps of the above method in combination with its hardware. To avoid repetition, detailed description is omitted here.

It should be noted that the processor in this embodiment of the present application may be an integrated circuit chip, which has a signal processing capability. In the implementation process, each step of the above method embodiments may be completed by a hardware integrated logic circuit in a processor or an instruction in the form of software. The aforementioned processors may be general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components . The methods, steps, and logic block diagrams disclosed in the embodiments of this application can be implemented or executed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules may be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other storage media mature in the art. The storage medium is located in the memory, and the processor reads the information in the memory, and completes the steps of the above method in combination with its hardware.

It can be understood that the memory in this embodiment of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically programmable Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory. Volatile memory may be random access memory (RAM), which acts 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 DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (synch-link DRAM) , SLDRAM) and direct memory bus random access memory (direct ram-bus RAM, DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but not be limited to, these and any other suitable types of memory.

According to the method provided by the embodiment of the present application, the present application also provides a computer program product, the computer program product includes: computer program code, when the computer program code is run on a computer, the computer is made to execute FIG. 3 or FIG. 4 or The method of any one of the embodiments shown in FIG. 5 or FIG. 6 or FIG. 7 or FIG. 8 .

According to the methods provided by the embodiments of the present application, the present application further provides a computer-readable medium, where program codes are stored in the computer-readable medium, and when the program codes are executed on a computer, the computer is made to execute FIG. 3 or FIG. 4 or The method of any one of the embodiments shown in FIG. 5 or FIG. 6 or FIG. 7 or FIG. 8 .

According to the methods provided in the embodiments of the present application, the present application further provides a system, which includes one or more of the foregoing apparatuses or devices.

In the above-mentioned embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented in software, 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 the computer instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer may be a general purpose computer, special purpose computer, computer network, or other programmable device. The computer instructions may be stored in or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server or data center Transmission to another website site, computer, server, or data center by wire (eg, coaxial cable, optical fiber, digital subscriber line, DSL) or wireless (eg, infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that includes an integration of one or more available media. The available media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, high-density digital video discs (DVDs)), or semiconductor media (eg, solid state discs, SSD)) etc.

The network-side equipment in each of the above apparatus embodiments corresponds to the terminal equipment and the network-side equipment or terminal equipment in the method embodiments, and corresponding steps are performed by corresponding modules or units. Or the step of sending, other steps except sending and receiving may be performed by a processing unit (processor). For functions of specific units, reference may be made to corresponding method embodiments. The number of processors may be one or more.

The terms "component", "module", "system" and the like are used in this specification to refer to a computer-related entity, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component may be, but is not limited to, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and the computing device may be components. One or more components may reside within a process and/or thread of execution, and a component may be localized on one computer and/or distributed between 2 or more computers. In addition, these components can execute from various computer readable media having various data structures stored thereon. A component may, for example, be based on a signal having one or more data packets (eg, data from two components interacting with another component between a local system, a distributed system, and/or a network, such as the Internet interacting with other systems via signals) Communicate through local and/or remote processes.

Those of ordinary skill in the art can realize 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. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, for the specific working process of the above-described systems, devices and units, reference may be made to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

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

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

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 alone, or two or more units may be integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program codes .

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. should be covered within the scope of protection of this application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

A voice communication method, comprising:

The first network element obtains the first Internet Protocol IP address of the terminal device registered in the first network;

The first network element sends first information to the second network element, where the first information includes a first IP address, the first IP address is an IP address related to the first connection of the terminal device, and the first IP address is a connection for accessing the Internet Protocol Multimedia Subsystem IMS;

The first network element receives first indication information from the second network element, where the first indication information is used to instruct the terminal device to switch or redirect from the first network to the second network, the The second network provides the IMS service for the terminal device through the IMS;

obtaining, by the first network element, the second IP address of the terminal device registered in the second network;

The first network element establishes a second connection according to the first indication information and the second IP address of the terminal device, where the second connection is used for the terminal device to access the IMS.
The method according to claim 1, wherein the first network element establishes a second connection according to the first indication information and the second IP address of the terminal device, comprising:

The first network element saves the state information of the terminal device according to the first indication information, the state information includes second indication information, and the second indication information is used to instruct the terminal device to switch or redirect After reaching the second network, the first network element establishes the second connection;

When the first network element obtains the second IP address of the terminal device registered in the second network, the first network element establishes the second connection according to the second indication information.
The method according to claim 1 or 2, wherein the obtaining, by the first network element, the second IP address of the terminal device registered in the second network comprises:

The first network element obtains the second IP address of the terminal device through a registration message, or;

The first network element acquires the second IP address of the terminal device through the terminal device address change message.
The method according to any one of claims 1 to 3, wherein the first network is an independently deployed non-public network.
The method according to any one of claims 1 to 4, wherein the second network is a public land mobile network.
The method according to any one of claims 1 to 5, wherein the first network element is a proxy call control function network element in the IMS network.
The method according to any one of claims 1 to 6, wherein the second network element is a policy control network element.
A voice communication method, comprising:

The third network element determines third indication information according to the first condition, where the third indication information is used to indicate whether the first network supports the Internet Protocol Multimedia Subsystem IMS service, and the first condition includes at least one of the following:

Whether the first network supports a home routing HR session with the second network, or; whether the first network and the second network have a common session management function network element and/or a common user plane function network element, Or; whether the first network and the second network have a common proxy call control function network element, or; whether there is a connection between the first network and the IMS of the second network, wherein the first network The second network provides the IMS service for the terminal equipment registered in the first network through the IMS;

The third network element sends the third indication information to the terminal device.
The method according to claim 8, wherein there is a connection between the first network and the IMS of the second network, and the first condition further comprises:

Whether the service level agreement SLA between the first network and the second network supports the IMS service.
The method according to claim 8 or 9, wherein the first network is an independently deployed non-public network.
The method according to any one of claims 8 to 10, wherein the second network is a public land mobile network.
The method according to any one of claims 8 to 11, wherein the third network element is an access and mobility management function network element.
A voice communication method, comprising:

The terminal device receives third indication information from a third network element in the first network, where the third indication information is used to indicate that the first network does not support the Internet Protocol Multimedia Subsystem IMS service;

The terminal device determines a second network according to the configuration information, the second network supports providing IMS services for the terminal device through the IMS, and the configuration information includes the priority of the candidate network. When there is a connection between the IMSs of the first network, and the first candidate network provides the IMS service for the terminal device, the priority of the first candidate network in the configuration information is higher than that of other candidate networks. priority.
The method of claim 13, wherein the method further comprises:

The terminal device updates configuration information, where the configuration information includes a network identifier of the first network and/or the third indication information.
The method according to claim 13 or 14, wherein the configuration information further comprises a network identifier of the candidate network and/or fourth indication information, wherein the fourth indication information is used to indicate whether the candidate network supports IMS business.
The method according to any one of claims 13 to 15, wherein the first network is an independently deployed non-public network.
The method according to any one of claims 13 to 16, wherein the second network is a public land mobile network.
The method according to any one of claims 13 to 17, wherein the third network element is an access and mobility management function network element.
A voice communication method, comprising:

The unified data management network element receives second information from the session management function network element in the first network, where the second information includes address information of the proxy call control function network element in the Internet Protocol Multimedia Subsystem IMS;

The unified data management network element receives the first request from the session management function network element in the second network, and the second network provides the IMS service for the terminal equipment registered in the second network through the IMS;

The unified data management network element sends a first response to the session management function network element in the second network, where the first response includes address information of the proxy call control function network element.
The method of claim 19, wherein the first network is an independently deployed non-public network.
The method according to claim 19 or 20, wherein the second network is a public land mobile network.
A voice communication device, comprising a transceiver unit and a processing unit:

The processing unit is configured to obtain the first Internet Protocol IP address of the terminal device;

The transceiver unit is configured to send first information, where the first information includes a first IP address, and the first IP address is an IP address related to a first connection of the terminal device, and the first connection is used to connect to the terminal device. into the Internet Protocol Multimedia Subsystem IMS;

The transceiver unit is configured to receive first indication information, where the first indication information is used to instruct the terminal device to switch or redirect from a first network to a second network, and the second network uses the IMS for the The terminal device provides the IMS service;

The processing unit is configured to obtain the second IP address of the terminal device;

The processing unit is configured to establish a second connection according to the first indication information and the second IP address of the terminal device, where the second connection is used for the terminal device to access the IMS.
The apparatus of claim 22, wherein:

The processing unit is further configured to save the state information of the terminal device according to the first indication information, the state information includes second indication information, and the second indication information is used to instruct the terminal device to switch or reset. After being directed to the second network, the first network element establishes the second connection;

When the processing unit acquires the second IP address, the processing unit establishes the second connection according to the second indication information.
The device according to claim 22 or 23, characterized in that,

The processing unit obtains the second IP address of the terminal device through a registration message, or;

The processing unit acquires the second IP address of the terminal device through the terminal device address change message.
The apparatus according to any one of claims 22 to 24, wherein the first network is an independently deployed non-public network.
The apparatus according to any one of claims 22 to 25, wherein the second network is a public land mobile network.
A voice communication device, comprising a transceiver unit and a processing unit:

The processing unit is configured to determine third indication information according to the first condition, where the third indication information is used to indicate whether the first network supports the Internet Protocol Multimedia Subsystem IMS service, and the first condition includes at least one of the following:

Whether the first network supports a home routing HR session with the second network, or; whether the first network and the second network have a common session management function network element and/or a common user plane function network element, Or; whether the first network and the second network have a common proxy call control function network element, or; whether there is a connection between the first network and the IMS of the second network, wherein the first network The second network provides the IMS service for the terminal equipment registered in the first network through the IMS;

The transceiver unit is configured to send the third indication information.
The apparatus according to claim 27, wherein there is a connection between the first network and the IMS of the second network, and the first condition further comprises: the first network and the second network Whether the service level agreement (SLA) between them supports the IMS service.
The apparatus according to claim 27 or 28, wherein the first network is an independently deployed non-public network.
The apparatus according to any one of claims 27 to 29, wherein the second network is a public land mobile network.
A voice communication device, comprising a processing unit and a transceiver unit:

The transceiver unit is configured to receive third indication information, where the third indication information is used to indicate that the first network does not support the Internet Protocol Multimedia Subsystem IMS service;

The processing unit is configured to determine the second network according to the configuration information, the second network supports providing IMS services for the terminal device through the IMS, and the configuration information includes the priority of the candidate network, when the first candidate network and the When there is a connection between the IMSs of the first network, and the first candidate network provides the IMS service for the terminal device, the priority of the first candidate network in the configuration information is higher than that of other candidate networks. priority.
The apparatus according to claim 31, wherein the processing unit is further configured to update configuration information, wherein the configuration information includes a network identifier of the first network and/or the third indication information.
The apparatus according to claim 31 or 32, wherein the configuration information further comprises a network identifier of the candidate network and/or fourth indication information, wherein the fourth indication information is used to indicate whether the candidate network supports IMS business.
The apparatus according to any one of claims 31 to 33, wherein the first network is an independently deployed non-public network.
The apparatus according to any one of claims 31 to 34, wherein the second network is a public land mobile network.
A voice communication device, comprising a transceiver unit:

The transceiver unit is configured to receive second information from the session management function network element in the first network, where the second information includes address information of the proxy call control function network element in the Internet Protocol Multimedia Subsystem IMS;

The transceiver unit is configured to receive a first request from a session management function network element in a second network, and the second network provides the IMS service for terminal equipment registered in the first network through the IMS;

The transceiver unit is configured to send a first response to the session management function network element in the second network, where the first response includes address information of the proxy call control function network element.
The apparatus according to claim 36, wherein the first network is an independently deployed non-public network.
The apparatus according to claim 36 or 37, wherein the second network is a public land mobile network.
A computer-readable storage medium storing a computer program, when the computer program runs on a computer, the computer causes the computer to execute the method according to any one of claims 1 to 7, or; causes the computer A computer performs the method as claimed in any one of claims 8 to 12, or; causes the computer to perform the method as claimed in any one of claims 13 to 18, or; causes the computer to perform the method as claimed in claim 19 The method of any one of to 21.
A communication system, characterized by comprising: a first network element for performing the method according to any one of claims 1 to 7 and a second network element for communicating with the first network element.
A communication system, characterized by comprising: a third network element for performing the method according to any one of claims 8 to 18 and a terminal device for communicating with the third network element.
A communication system, characterized by comprising: a unified data management network element for performing the method according to any one of claims 19 to 21 and a first network element for communicating with the unified data management network element The session management function network element of the session management function network element and the session management function network element in the second network.