WO2023071847A1

WO2023071847A1 - Service transfer method and communication apparatus

Info

Publication number: WO2023071847A1
Application number: PCT/CN2022/125705
Authority: WO
Inventors: 彭文杰
Original assignee: 华为技术有限公司
Priority date: 2021-10-30
Filing date: 2022-10-17
Publication date: 2023-05-04
Also published as: CN116074791A

Abstract

The present application provides a service transfer method and a communication apparatus. The service transfer method comprises: a first access network device receives a first message from a core network device or a first terminal device, the first message being used for requesting to transfer a target service carried by the first terminal device to a second terminal device; the first access network device sends a second message to the second terminal device, the second message being used for establishing a first data radio bearer (DRB) corresponding to the target service; and the first access network device sends a data packet of the target service to the second terminal device on the basis of the first DRB. By means of the described service transfer method, when an access network device senses, a target service is transferred from a source terminal device to a target terminal device, which improves the universality of service transfer between the terminal devices.

Description

A service transfer method and communication device

This application claims the priority of the Chinese patent application with the application number 202111278430.6 and the application title "A Service Transfer Method and Communication Device" filed with the China Patent Office on October 30, 2021, the entire contents of which are incorporated herein by reference. Applying.

technical field

The present application relates to the technical field of communication, and in particular to a service transfer method and a communication device.

Background technique

In people's work and study, usually multiple terminal devices need to work together, that is, the same user can have multiple terminal devices. The network formed by different terminal devices of the same user can be simply understood as a personal Internet of Things network (personaliot network, PIN), and each terminal device forming the PIN is regarded as a PIN element (element). With the continuous development of terminal equipment intelligence, different terminal equipment may also have some common functions, for example, mobile phones, computers, and televisions can all be used as video communication equipment.

In order to meet the increasingly rich service requirements of users, how to transfer the services of users between different terminal devices is an urgent problem to be solved.

Contents of the invention

Embodiments of the present application provide a service transfer method and a communication device. Through such a service transfer method, a target service carried by a source terminal device can be transferred to a destination terminal device, thereby improving the universality of the service transfer method of a terminal device.

In the first aspect, the embodiment of the present application provides a service transfer method, in which the first access network device receives a first message from the core network device or the first terminal device, and the first message is used to request the transfer of the second The target service carried by a terminal device is transferred to the second terminal device; the first access network device sends a second message to the second terminal device, and the second message is used to establish a first DRB corresponding to the target service; further, the first The access network device sends the data packet of the target service to the second terminal device based on the first DRB.

Based on the method described in the first aspect, the target service carried by the source terminal device can be transferred to the destination terminal device on the access network device side, and the service transfer between terminal devices can no longer be assisted by software, which improves the service in the terminal. Ubiquitous transfer between devices.

In a possible implementation manner, the first message comes from the first terminal device, and the first access network device may also send a third message to the core network device, where the third message is used to request that the first terminal device carry the target The business is transferred to the second terminal device; the third message includes the identification of the second terminal device, the identification of the first terminal device, the PIN identification of the personal Internet of Things network corresponding to the first terminal device, and the index of the first terminal device in the PIN , one or more of the PIN identifier corresponding to the second terminal device, the index of the second terminal device in the PIN, the identifier of the packet data unit PDU corresponding to the target service, or the quality of service QoS flow identifier corresponding to the target service; the first The access network device receives the confirmation message from the core network device, where the confirmation message is used to respond to the third message. By implementing this possible implementation mode, a service transfer method can be provided for the scenario where the access network device is used as the control anchor point of the service transfer, which reduces the limitation of the service transfer method in this application and improves the universality .

In a possible implementation manner, the first access network device sends a fourth message to the first terminal device, where the fourth message is used to instruct the first terminal device to release the second DRB corresponding to the target service, or, the fourth message It is used to instruct the first terminal device to release the radio resource control RRC connection with the first access network device. By implementing this possible implementation mode, after the transfer of the target service from the source terminal device to the destination terminal device is completed, the DRB of the source terminal device for the target service is released immediately, which saves communication resources and reduces power consumption of the terminal device.

In a possible implementation manner, the first access network device transmits the target service with the first terminal device based on the first protocol stack instance, and the first access network device transmits the target service with the second terminal device based on the second protocol stack instance, Before the first access network device sends the data packet of the target service to the second terminal device based on the first DRB, the first access network device performs rollback processing on the first data packet of the target service to obtain a second data packet. A data packet is a data packet processed by the first protocol stack instance but not sent to the first terminal device; the first access network device sends the second data packet to the second terminal device based on the first DRB. By implementing this possible implementation manner, the continuity of service data after service transfer is ensured.

In a possible implementation manner, the serving access network device of the second terminal device is the first access network device, the serving access network device of the first terminal device is the second access network device, and the first message comes from the core network equipment.

In a possible implementation manner, the first message further includes indication information for requesting the first forwarding address, and the first access network device sends the first forwarding address to the core network device.

In a possible implementation manner, before the first access network device sends the data packet of the target service to the second terminal device based on the first DRB, the first access network device receives the The third data packet of the target service of the device or the core network device, the third data packet is a data packet received by the second access network device from the core network device but not sent to the first terminal device; the first access network device based on The first DRB sends the third data packet to the second terminal device. By implementing this possible implementation manner, the continuity of service data after service transfer is ensured.

In a possible implementation manner, the second terminal device is in a non-connected state, and after the first access network device receives the first message from the core network device or the first terminal device, the first access network device receives the first message from the core network device The paging message carries the identifier of the second terminal device; the first access network device pages the second terminal device based on the paging message.

In a possible implementation, the first message includes one or more of the following information: the identifier of the second terminal device, the identifier of the first terminal device, the PIN identifier corresponding to the first terminal device, the An index in the PIN, a PIN identifier corresponding to the second terminal device, an index in the PIN of the second terminal device, an identifier of a PDU corresponding to the target service, or a QoS flow identifier corresponding to the target service.

In a possible implementation manner, the first message is from a core network device, the first message is a message for the first terminal device, and the first message further includes an identifier of the second terminal device; or, the first message is for a For the message of the second terminal device, the first message further includes the identifier of the first terminal device.

In a possible implementation manner, before the first access network device receives the first message from the core network device or the first terminal device, the first access network device obtains the PIN identifier corresponding to the first terminal device from the core network device A PIN identifier corresponding to the second terminal device.

In a possible implementation manner, the first terminal device and the second terminal device belong to the same PIN.

In a possible implementation manner, the IP address of the second terminal device for the target service is the same as the IP address of the first terminal device for the target service.

In the second aspect, the embodiment of the present application provides another service transfer method. In this method: when the first terminal device detects the second terminal device, the first terminal device sends a message to the core network device or the access network device A first message, where the first message is used to request to transfer the target service carried by the first terminal device to the second terminal device, where the access network device is a serving access network device of the first terminal device.

Based on the method described in the second aspect, its beneficial effect can refer to the beneficial effect of the method described in the first aspect above, and will not be repeated here.

In a possible implementation manner, the first terminal device receives the fourth message from the access network device; the first terminal device releases the second data radio bearer DRB corresponding to the target service according to the fourth message, or releases and accesses the Radio resource control RRC connection between network devices.

In a possible implementation manner, the first message includes one or more of the following information: the identifier of the second terminal device, the identifier of the first terminal device, the PIN identifier of the personal Internet of Things network corresponding to the first terminal device, The index of the first terminal device in the PIN, the PIN identifier corresponding to the second terminal device, the index of the second terminal device in the PIN, the identifier of the packet data unit PDU corresponding to the target service or the QoS flow identifier corresponding to the target service.

In the third aspect, the embodiment of the present application provides yet another service transfer method, in which method: the core network device sends a first message to the first access network device; the first message is used to request that the first terminal device carry the The target service is transferred to the second terminal device; the first access network device is the service access network device of the second terminal device;

Or, the core network device receives a third message from the second access network device; the third message is used to request to transfer the target service carried by the first terminal device to the second terminal device; the second access network device is the first Service access network equipment for terminal equipment.

For the beneficial effects obtained based on the method described in the third aspect, for details, please refer to the beneficial effects described in the first aspect above, which will not be repeated here.

In a possible implementation manner, the first access network device and the second access network device are the same access network device.

In a possible implementation, the first access network device is different from the second access network device, the first message further includes indication information for requesting the first forwarding address, and the core network device sends the After the first message, the core network device receives the first forwarding address from the first access network device; the core network device sends the second forwarding address to the second access network device based on the first forwarding address, and the second forwarding address is The first forwarding address or the data receiving address of the core network device.

In a possible implementation, the second forwarding address is the data receiving address of the core network device, and the core network device receives the third data packet from the second access network device, and the third data packet is the address of the second access network device. The data packet received by the device from the core network device but not sent to the first terminal device; the core network device sends the third data packet to the first access network device based on the first forwarding address.

In a possible implementation, the first message includes one or more of the following information: the identifier of the second terminal device, the identifier of the first terminal device, the PIN identifier corresponding to the first terminal device, the An index in the PIN, a PIN identifier corresponding to the second terminal device, an index in the PIN of the second terminal device, an identifier of a PDU corresponding to the target service, or a QoS flow identifier corresponding to the target service;

Alternatively, the third message includes one or more of the following information: the identifier of the second terminal device, the identifier of the first terminal device, the PIN identifier corresponding to the first terminal device, the index of the first terminal device in the PIN, the The PIN identifier corresponding to the second terminal device, the index of the second terminal device in the PIN, the identifier of the PDU corresponding to the target service, or the QoS flow identifier corresponding to the target service.

In a possible implementation manner, the first message is a message for the first terminal device, and the first message further includes an identifier of the second terminal device; or, the first message is a message for the second terminal device, and the first The message also includes an identification of the first terminal device.

In a possible implementation manner, the third message is a message for the first terminal device, and the third message further includes an identifier of the second terminal device; or, the third message is a message for the second terminal device, and the third message The message also includes an identification of the first terminal device.

In a possible implementation manner, the core network device sends the PIN identifier corresponding to the first terminal device and the PIN identifier corresponding to the second terminal device to the first access network device.

In a fourth aspect, the present application provides a communication device, which may be a device in the first access network device, or a device that can be matched and used with the first access network device. Wherein, the communication device may also be a system on a chip. The communication device can execute the method described in the first aspect. The functions of the communication device may be realized by hardware, or may be realized by executing corresponding software by hardware. The hardware or software includes one or more units corresponding to the functions described above. This unit can be software and/or hardware. For operations and beneficial effects performed by the communication device, reference may be made to the method and beneficial effects described in the first aspect above, and repeated descriptions will not be repeated.

In a fifth aspect, the present application provides a communication device, which may be a device in a terminal device, or a device that can be matched and used with the terminal device. Wherein, the communication device may also be a system on a chip. The communication device can execute the method described in the second aspect. The functions of the communication device may be realized by hardware, or may be realized by executing corresponding software by hardware. The hardware or software includes one or more units corresponding to the functions described above. This unit can be software and/or hardware. For operations and beneficial effects performed by the communication device, reference may be made to the method and beneficial effects described in the second aspect above, and repeated descriptions will not be repeated.

In a sixth aspect, the present application provides a communication device, which may be a device in a core network device, or a device that can be matched with the core network device. Wherein, the communication device may also be a system on a chip. The communication device can execute the method described in the third aspect. The functions of the communication device may be realized by hardware, or may be realized by executing corresponding software by hardware. The hardware or software includes one or more units corresponding to the functions described above. This unit can be software and/or hardware. For operations and beneficial effects performed by the communication device, reference may be made to the method and beneficial effects described in the third aspect above, and repeated descriptions will not be repeated.

In a seventh aspect, the present application provides a communication device. The communication device may be the first access network device in the foregoing method embodiment, or a chip provided in the first access network device. The communication device includes a communication interface, a processor, and optionally, a memory. Wherein, the memory is used to store computer programs or instructions, and the processor is coupled to the memory and the communication interface, and when the processor executes the computer programs or instructions, the communication device is made to execute the method performed by the first access network device in the above method embodiment. method of execution.

In an eighth aspect, the present application provides a communication device, and the communication device may be the first terminal device in the above method embodiment, or a chip provided in the terminal device. The communication device includes a communication interface, a processor, and optionally, a memory. Wherein, the memory is used to store computer programs or instructions, and the processor is coupled with the memory and the communication interface. When the processor executes the computer programs or instructions, the communication device is made to execute the method executed by the first terminal device in the above method embodiment. method.

In a ninth aspect, the present application provides a communication device. The communication device may be the core network device in the foregoing method embodiment, or a chip provided in the core network device. The communication device includes a communication interface, a processor, and optionally, a memory. Wherein, the memory is used to store computer programs or instructions, and the processor is coupled to the memory and the communication interface, and when the processor executes the computer programs or instructions, the communication device executes the method performed by the core network device in the above method embodiment .

In a tenth aspect, the present application provides a computer-readable storage medium, the computer-readable storage medium is used to store computer-executable instructions, and when the computer-executable instructions are executed, the first The method performed by the access network device is implemented; or, the method performed by the first terminal device in the method described in the second aspect is implemented; or, the method performed by the core network device in the method described in the third aspect is implemented be realized.

In an eleventh aspect, the present application provides a computer program product including a computer program. When the computer program is executed, the method performed by the first access network device in the method described in the first aspect is realized; or, The method performed by the first terminal device in the method described in the second aspect is realized; or the method performed by the core network device in the method described in the third aspect is realized.

In a twelfth aspect, the present application provides a communication system, which includes the communication devices described in the fourth, fifth, and sixth aspects above; or includes the communication devices described in the seventh, eighth, and ninth aspects above. the communication device described above.

Description of drawings

Figure 1a is a schematic diagram of a system architecture provided by the present application;

Figure 1b is a schematic diagram of a system architecture provided by the present application;

FIG. 2 is a schematic structural diagram of a core network provided by the present application;

Figure 3a is a schematic diagram of a PIN provided by the present application;

Figure 3b is a schematic diagram of another PIN provided by the present application;

FIG. 4 is a schematic flow diagram of a service transfer method provided by the present application;

FIG. 5 is a schematic flowchart of another service transfer method provided by the present application;

FIG. 6 is a schematic diagram of an operation of rollback processing provided by the present application;

FIG. 7 is a schematic flowchart of another service transfer method provided by the present application;

FIG. 8 is a schematic flowchart of another service transfer method provided by the present application;

FIG. 9 is a schematic flowchart of another service transfer method provided by the present application;

FIG. 10 is a schematic structural diagram of a communication device provided by the present application;

FIG. 11 is a schematic structural diagram of another communication device provided by the present application.

Detailed ways

The specific embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings.

The terms "first" and "second" in the specification, claims and drawings of the present application are used to distinguish different objects, rather than to describe a specific order. Furthermore, the terms "include" and "have", as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally further includes For other steps or units inherent in these processes, methods, products or apparatuses.

Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.

In this application, "at least one (item)" means one or more, "multiple" means two or more, "at least two (items)" means two or three and three Above, "and/or" is used to describe the association relationship of associated objects, which means that there can be three kinds of relationships, for example, "A and/or B" can mean: only A exists, only B exists, and A and B exist at the same time A case where A and B can be singular or plural. The character "/" generally indicates that the contextual objects are an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one item (piece) of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c ", where a, b, c can be single or multiple.

In order to better understand the embodiment of the present application, the following first introduces the system architecture involved in the embodiment of the present application:

The technical solution of the embodiment of the present application can be applied to various communication systems, such as: global system of mobile communication (global system of mobile communication, GSM) system, code division multiple access (code division multiple access, CDMA) system, broadband code division multiple access (wideband code division multiple access, WCDMA) system, general packet radio service (general packet radio service, GPRS), long term evolution (long term evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE Time Division Duplex (TDD), Universal Mobile Telecommunications System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) Communication System, Fifth Generation (5G) system or new radio (new radio, NR) and future communication systems, etc.

Please refer to FIG. 1a and FIG. 1b. FIG. 1a is a schematic diagram of a system architecture provided by an embodiment of the present application, and FIG. 1b is a schematic diagram of another system architecture provided by an embodiment of the present application. In the system architecture shown in FIG. 1a, it includes user equipment (user equipment, UE) 1, UE2, access network equipment and core network equipment. Wherein, UE1 and UE2 correspond to the same access network device (or understand that the same access network device provides services for UE1 and UE2). In the system architecture shown in FIG. 1b, UE1, UE2, access network device 1, access network device 2 and core network device are included. Wherein, UE1 corresponds to access network device 1, and UE2 corresponds to access network device 2, that is, it can be understood that different access network devices provide services for UE1 and UE2 respectively.

The terminal equipment, access network equipment and core network equipment involved in the system architectures in FIG. 1a and FIG. 1b are described in detail below.

1. Terminal equipment

Terminal equipment includes equipment that provides voice and/or data connectivity to users. For example, terminal equipment is a device with wireless transceiver capabilities that can be deployed on land, including indoor or outdoor, handheld, wearable, or vehicle-mounted; it can also be deployed in On the water (such as ships, etc.); can also be deployed in the air (such as aircraft, balloons and satellites, etc.). The terminal can be a mobile phone, a tablet computer (Pad), a computer with a wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, or a wireless terminal in industrial control (industrial control) , vehicle terminal equipment, wireless terminals in self driving, wireless terminals in remote medical, wireless terminals in smart grid, wireless terminals in transportation safety, Wireless terminals in smart cities, wireless terminals in smart homes, wearable terminal devices, etc. The embodiments of the present application do not limit the application scenarios. A terminal may sometimes be referred to as terminal equipment, user equipment (UE), access terminal equipment, vehicle-mounted terminal, industrial control terminal, UE unit, UE station, mobile station, mobile station, remote station, remote terminal equipment, mobile equipment, UE terminal equipment, terminal equipment, wireless communication equipment, UE proxy or UE device, etc. Terminals can also be fixed or mobile. In this application, UE is used to refer to terminal equipment in the following text.

2. Access network equipment

The interface between the access network device (also called network device) and the terminal device may be a Uu interface (or called an air interface). Of course, in future communications, the names of these interfaces may remain unchanged, or may be replaced by other names, which is not limited in this application.

A network device is a node or device that connects a terminal device to a wireless network. The network device can be any device with wireless transceiver function, including but not limited to: evolved base station (NodeB or eNB or e-NodeB, evolutional Node B) in LTE, base station in NR (gNodeB or gNB) or transmission The receiving point (Transmission ReceptionPoint, TRP), the base station of the subsequent evolution of 3GPP, the access node in the WiFi system, the wireless relay node, the wireless backhaul node, etc. The base station can be: a macro base station, a micro base station, a pico base station, a small station, a relay station, or a balloon station, etc. Multiple base stations may support the aforementioned networks of the same technology, or may support the aforementioned networks of different technologies. A base station may contain one or more co-sited or non-co-sited TRPs. The network device can also be a wireless controller, a centralized unit (Central Unit, CU), and/or a distributed unit (Distributed Unit, DU) in a cloud radio access network (Cloud Radio Access Network, CRAN) scenario. The network device can also be a server, a wearable device, or a vehicle-mounted device, etc. In the following, a network device is used as an example for description. The multiple network devices may be base stations of the same type, or base stations of different types. The base station can communicate with the terminal equipment, and can also communicate with the terminal equipment through the relay station. The terminal device can communicate with multiple base stations of different technologies. For example, the terminal device can communicate with the base station supporting the LTE network, and also can communicate with the base station supporting the 5G network. It can also support the communication between the base station of the LTE network and the base station of the 5G network. double connection.

3. Core network (core network, CN)

A CN may include one or more CN devices. Please refer to Figure 2, taking the 5G communication system as an example, the CN may include access and mobility management function (access and mobility management function, AMF) network elements, session management function (session management function, SMF) network elements, User plane function (UPF) NE, policy control function (PCF) NE, unified data management (UDM) NE, application function (AF) NE, etc. . in:

The AMF network element is a control plane network element provided by the operator network, responsible for access control and mobility management of terminal equipment accessing the operator network, such as including mobility status management, assigning temporary user IDs, authenticating and authorizing users, etc. .

The SMF network element is a control plane network element provided by the operator network, and is responsible for managing the protocol data unit (protocoldata unit, PDU) session of the terminal device. A PDU session is a channel for transmitting PDUs, and terminal equipment needs to transmit PDUs with DN through the PDU session. The PDU session is established, maintained and deleted by the SMF network element. SMF network elements include session management (such as session establishment, modification and release, including tunnel maintenance between UPF and RAN), selection and control of UPF network elements, service and session continuity (service and session continuity, SSC) mode selection, Session-related functions such as roaming.

The UPF network element is the gateway provided by the operator, and is the gateway for communication between the operator's network and the DN. UPF network elements include data packet routing and transmission, packet inspection, quality of service (QoS) processing, lawful interception, uplink packet detection, downlink data packet storage and other user-plane-related functions.

In addition, although not shown, CN may also include other possible network elements, such as network exposure function (network exposure function, NEF) network elements, network function repository function (network function repository function, NRF) network elements, application function (application function, AF) network element, unified data repository (unified data repository, UDR) network element, network data analysis function (network data analytics function, NWDAF) network element.

DN can also be called packet data network (packet data network, PDN), which is a network located outside the operator's network. The operator's network can access multiple DNs, and application servers corresponding to various services can be deployed in the DN. End devices offer a wide variety of possible services.

In FIG. 2, Npcf, Nudm, Naf, Namf, Nsmf, N1, N2, N3, N4, and N6 are interface serial numbers. For the meanings of these interface serial numbers, refer to the meanings defined in relevant standard protocols, and there is no limitation here.

It can be understood that, Fig. 1a and Fig. 1b are illustrated by taking the 5G communication system as an example, and the solution in the embodiment of the present application can also be applied to other possible communication systems, such as the LTE communication system or the future sixth generation ( the 6th generation, 6G) communication system. The foregoing network element or function may be a network element in a hardware device, or a software function running on dedicated hardware, or a virtualization function instantiated on a platform (for example, a cloud platform). Optionally, the foregoing network element or function may be implemented by one device, or jointly implemented by multiple devices, or may be a functional module in one device, which is not specifically limited in this embodiment of the present application.

In order to facilitate the understanding of the content of the present solution, some terms in the embodiments of the present application will be explained below, so as to facilitate the understanding of those skilled in the art.

1. Personal IoT network (PIN)

It can be simply understood as a network formed by different devices of the same user, and each terminal device forming the PIN is regarded as a PIN element (element). For example, please refer to FIG. 3a and FIG. 3b , which are respectively a network structure diagram of a PIN provided by the present application. Wherein, the PIN element in Fig. 3a includes user A's UE1 and the wearable device (UE2), and in Fig. 3a, the PIN element has the ability of direct communication with the base station. The PIN element in Figure 3b includes user A's UE1, PIN management device, display (UE3 in Figure 3b) and audio equipment (UE4 in Figure 3b), and the PIN element in Figure 3b does not necessarily have the ability to communicate directly with the base station ( UE3 and UE4 in Fig. 3b). It should be understood that when the device does not have the capability of directly communicating with the base station, it can add a PIN through the PIN management device, that is, UE3 in Figure 3b can become a PIN element through the PIN management device.

2. Quality of service flow (QoS flow)

Service transfers can be performed between terminal equipment and UPF network elements through protocol data unit (packet data unit, PDU) sessions, and multiple data streams with different QoS requirements can be transmitted in each PDU session, that is, QoS streams.

3. PC5 interface

A communication interface corresponding to a direct communication link for communication between user equipments is defined as a PC5 interface.

4. Uu interface

The communication interface of the link between the user equipment and the network equipment is defined as Uu interface.

5. Business transfer

It can be understood as the target service originally carried by the source terminal device, and after the service is transferred, the base station sends the target service to the destination terminal device. For example, in the PIN shown in Figure 3a, after the target service is transferred from UE1 (source terminal equipment) to UE2 (destination terminal equipment), the base station can send the target service to UE2 through the Uu interface; in the PIN shown in Figure 3b, After the target service is transferred from UE1 (source terminal equipment) to UE3 (destination terminal equipment), since UE3 (destination terminal equipment) does not have the ability to directly communicate with the base station, in this case, the base station can send PIN management via the Uu interface. The device sends the target service, and the PIN management device forwards the target service to UE3 through the PC5 interface (or an interface of a non-3GPP access technology such as a WiFi interface and a Bluetooth interface). It should be noted that the terminal device mentioned in this application is only a terminal device capable of directly communicating with a base station as an example for schematic explanation, and should not be regarded as a specific limitation on the solution of this application.

The service transfer method and communication device provided by this application are further introduced below in conjunction with the accompanying drawings:

Please refer to FIG. 4 . FIG. 4 is a schematic flowchart of a service transfer method provided by an embodiment of the present application. As shown in Figure 4, the method execution subject of the service transfer method may be the first access network device or a chip in the first access network device, or the execution subject may be the first terminal device or a chip in the first terminal device , or the execution subject may be a core network device or a chip in the core network device. FIG. 4 uses the first terminal device, the first access network device, and the core network device as examples for illustration. in:

S401. The first access network device receives a first message from a core network device or a first terminal device, where the first message is used to request transfer of a target service carried by the first terminal device to a second terminal device.

In other words, the first terminal device is the source terminal device that bears the target service, and the second terminal device is the destination terminal device that bears the target service. After the first terminal device detects (or understands as discovering) the second terminal device, in one case, the first terminal device may send a service access network device corresponding to the first terminal device (or understand it as the first The access network device connected to the terminal device) sends a service transfer request to the core network device, and then the core network device sends a first message to the first access network device (the serving access network device of the second terminal device) according to the service transfer request or, in another case, the first terminal device may directly send the first message to the first access network device, and in this case, the first access network device is also a service connection corresponding to the first terminal device network access equipment.

In a possible implementation, the first message includes one or more of the following information: the identifier of the second terminal device, the identifier of the first terminal device, the PIN identifier corresponding to the first terminal device, the first terminal The index of the device in the PIN, the PIN identifier corresponding to the second terminal device, the index of the second terminal device in the PIN, the identifier of the PDU corresponding to the target service, or the identifier of the QoS flow corresponding to the target service.

Wherein, the identifier of the second terminal is used to uniquely indicate the second terminal device, such as the ID of the second terminal device; the identifier of the first terminal device is used to uniquely indicate the first terminal device, such as the ID of the first terminal device; The PIN identifier corresponding to a terminal device is used to indicate the PIN to which the first terminal device belongs; the index of the first terminal device in the PIN is used to indicate the first terminal device in the PIN to which the first terminal device belongs; the second The PIN identifier corresponding to the terminal device is used to indicate the PIN to which the second terminal device belongs when carrying the target service; the index of the second terminal in the PIN is used to indicate the second terminal device in the PIN to which the second terminal device belongs; the target The identifier of the PDU corresponding to the service is used to indicate the PDU session corresponding to the target service; the identifier of the QoS flow corresponding to the target service is used to indicate the QoS flow corresponding to the data packet of the target service.

It should be noted that, in the process of transferring the target service from the first terminal device to the second terminal device, the first terminal device and the second terminal device belong to the same PIN. When the first message contains the PIN identifier corresponding to the second terminal device, the purpose of the PIN identifier corresponding to the second terminal device can be understood as: when a terminal device is in multiple PINs at the same time, the first message contains the PIN identifier corresponding to the second terminal device. The PIN identifier corresponding to the two terminals may indicate the PIN to which the second terminal device belongs when carrying the target service. For example, the second terminal device is both a PIN element in PIN1 and a PIN element in PIN2. When the first terminal device is a PIN element in PIN1, the target service carried by the first terminal device is transferred to the second terminal device, that is, It can be understood as transferring the target service carried by the first terminal device to the second terminal device in PIN1. In this case, the PIN identifier corresponding to the second terminal device in the first message is the identifier of PIN1.

In a possible implementation manner, before the first access network device receives the first message from the core network device or the first terminal device, the first access network device acquires the PIN identifier corresponding to the first terminal device from the core network device A PIN identifier corresponding to the second terminal device. It can be understood that since the core network device will be responsible for the PIN device registration process, when the terminal device establishes a context with the core network device and the access network device, the core network device can send the PIN identifier corresponding to the terminal device to the access network equipment.

Exemplarily, the PIN elements of PIN1 include: UE1, UE2, and UE3; the PIN elements of PIN2 include: UE2, UE3, and UE4. For the convenience of description, take the scenario where the first access network device is the serving access network device of UE1 and UE2 as an example. When UE1 establishes a context connection with the first access network device and the core network device, the core network device The network access device sends the PIN identifier to which UE1 belongs, such as the identifier of PIN1; when UE2 establishes a context connection with the first access network device and the core network device, the core network device sends the PIN identifier to which UE2 belongs to the first access network device, That is, the identification of PIN1 and the identification of PIN2.

In a possible implementation manner, the IP address of the second terminal device for the target service is the same as the IP address of the first terminal device for the target service. By implementing this possible implementation, after the service is transferred, it is not necessary to change the IP address of the service data due to the replacement of the terminal device, and it is possible to avoid service interruption caused by changing the IP address during the service transfer process. In other words, in order to facilitate the destination terminal device to normally receive service data after service transfer, in the PIN to which the source terminal device carrying the target service belongs, all PIN elements have the same IP address for the target service.

S402. The first access network device sends a second message to the second terminal device, where the second message is used to establish a first data radio bearer (data radio bearer, DRB) corresponding to the target service.

After the first access network device receives the first message requesting transfer of the target service, the first access network device sends a second message to the destination terminal device corresponding to the target service (that is, the second terminal device) to establish an The first DRB corresponding to the target service, and the second message includes configuration information of the first DRB.

In a possible implementation, after the first access network device receives the first message from the core network device or the first terminal device, the second terminal device is in a disconnected state, and the first access network device receives the message from the core network device The paging message carries the identifier of the second terminal device. Further, the first access network device pages the second terminal device based on the paging message.

In other words, the first access network device is the serving access network device of the second terminal device, and when the first terminal device discovers (or understands to detect) the second terminal device, the connection between the second terminal and the first access network device There is no radio resource control (RRC) connection between them. After the first terminal device determines to transfer the target service to the second terminal device (that is, after the first access network device receives the first message from the core network device or the first terminal device), the first access network device Instruction (that is, a paging message with the identifier of the second terminal device sent by the core network), paging the second terminal device.

S403. The first access network device sends the data packet of the target service to the second terminal device based on the first DRB.

The first access network device continues to send the data packet of the target service to the second terminal device through the first DRB. For example, the data packets of the target service include: data packet 1, data packet 2, ..., data packet n, when the source terminal device carrying the target service (that is, the first terminal device) receives the data packet 4, the first connection The network access device receives the first message from the core network device or the first terminal device, and then the first access network device sends the second information to the second terminal device, so that the first access network device and the second terminal device establish a transmission target The first DRB of the business. Further, the first access network device sends data packet 5 and subsequent data packets to the second terminal device through the first DRB.

Through such a service transfer method, the target service carried by the source terminal device can be transferred to the destination terminal device on the side of the access network device, which can no longer be realized through software assistance, which improves the universality of service transfer between terminal devices.

The service transfer method mentioned in this application will be described in detail below in conjunction with the system architecture shown in Figure 1a and Figure 1b, and the control anchor point of service transfer is on the access network device side or on the core network device side.

In the scenario where the service access network devices of the source terminal device and the destination terminal device are the same access network device, that is, the system architecture shown in Figure 1a above, and the control anchor point of service transfer is on the core network device side, please refer to Figure 5, FIG. 5 is a schematic flowchart of another service transfer method provided by the embodiment of the present application. In the scenario corresponding to the service transfer method shown in Figure 5, the service access network devices corresponding to the source terminal device (that is, the first terminal device) and the destination terminal device (that is, the second terminal device) are both first access network devices . As shown in Figure 5, the method execution subject of the service transfer method may be the first access network device or a chip in the first access network device, or the execution subject may be the first terminal device or a chip in the first terminal device , or the execution subject may be a core network device or a chip in the core network device. FIG. 5 uses the first terminal device, the first access network device, and the core network device as examples for illustration. in:

S501. When the first terminal device detects the second terminal device, the first terminal device sends a fifth message to the core network device.

The first terminal device serves as the source terminal device carrying the target service of the target service. When the first terminal device discovers (or understands to detect) the second terminal device, after the first terminal device receives the service transfer instruction input by the user, the first terminal device The terminal device sends a fifth message to the core network device through the first access network device, for example, the fifth message may be a service transfer request message. In one case, if the first terminal device finds (or detects) at least one available terminal device in the PIN to which it belongs, the first terminal device can select from at least one available terminal device in the PIN according to the instruction input by the user. Determine the second terminal device used to bear the target service among the terminal devices. After the first terminal device determines the second terminal device, the first terminal device sends the fifth message to the core network device through the first access network device. Wherein, the fifth message is used to request to transfer the target service carried by the first terminal device to the second terminal device.

Exemplarily, the PIN elements in PIN1 include UE1, UE2 and UE3. Where UE1 is the source terminal device (that is, the first terminal device) carrying the target service of the target service. After UE2 and UE3 are powered on (or understood to be powered on), UE1 detects that the terminal devices available in its PIN1 are UE2 and UE3, then UE1 can receive user instructions (including but not limited to touch instructions), according to this The instruction determines the target terminal equipment used to bear the target service from UE2 and UE3. For example, the destination terminal device is UE2, UE1 sends a fifth message to the first access network device, and the first access network device forwards the fifth message to the core network device.

In a possible implementation, the fifth message includes one or more of the following information: the identifier of the second terminal device, the identifier of the first terminal device, the PIN identifier corresponding to the first terminal device, the The index of the device in the PIN, the PIN identifier corresponding to the second terminal device, the index of the second terminal device in the PIN, the identifier of the PDU corresponding to the target service, or the identifier of the QoS flow corresponding to the target service. For the explanation of each item of information in the fifth message, refer to the related description of each item of information in the first message in S401 above, and no more details are given here.

In a possible implementation manner, before the first terminal device sends the fifth message to the core network device, the first access network device acquires the PIN identifier corresponding to the first terminal device from the core network device or the PIN identifier of the first terminal device in the PIN to which it belongs. index within. It can be understood that before the first terminal device bears the target service, the first terminal device needs to first establish a context with the core network device and the access network device base station. In the process of establishing the context, the core network device sends an initial context establishment request of the first terminal device to the first access network device, and the initial context establishment request of the first terminal device may carry the PIN identifier corresponding to the first terminal device or the first The index of the end device within the PIN it belongs to.

It should be noted that the IP address of the second terminal device for the target service is the same as the IP address of the first terminal device for the target service. The PIN to which the second terminal device belongs when carrying the target service is the same as the PIN to which the first terminal device belongs when carrying the target service.

S502. The first access network device receives the first message from the core network device.

After the core network device receives the fifth message sent by the first terminal device, the core network device sends the first message to the first access network device. Furthermore, the first access network device may also send a response message to the core network device based on the first message.

In an optional implementation manner, the first message is a message directed to the first terminal device, and the first message further includes an identifier of the second terminal device. It can be understood that, when the first message is an interface message of the first terminal device, the first information also carries an identifier of the second terminal device, and the identifier of the second terminal device is used to notify the first access network device that the The PDU session or QoS flow corresponding to the target service of the first terminal device is transferred to the target terminal device (that is, the second terminal device).

Or, in another optional implementation manner, the first message is a message directed to the second terminal device, and the first message further includes an identifier of the first terminal device. It can be understood that, when the first message is an interface message of the second terminal device, the first information also carries an identifier of the first terminal device, and the identifier of the first terminal device is used to notify the first access network device to be The target terminal device (that is, the second terminal device) creates a PDU session or QoS flow corresponding to the target service, and the PDU session or QoS flow originates from the PDU session or QoS flow corresponding to the target service of the first terminal device.

In a possible implementation manner, after the first access network device receives the first message from the core network device, the second terminal device is in a disconnected state, and the first access network device receives the paging message from the core network device, The paging message carries the identifier of the second terminal device. Further, the first access network device pages the second terminal device based on the paging message.

S503. The first access network device sends a second message to the second terminal device, where the second message is used to establish a first DRB corresponding to the target service.

For the specific implementation manner of S503, reference may be made to the description of the specific implementation manner of S402 above, and details are not repeated here.

In a possible implementation method, the first access network device may also send a fourth message to the first terminal device, where the fourth message is used to instruct the first terminal device to release the second DRB corresponding to the target service, or, the first The fourth message is used to instruct the first terminal device to release the radio resource control RRC connection with the first access network device. It should be noted that the timing at which the first access network device sends the fourth message to the first terminal device may be the same as the timing at which the first access network device sends the second message to the second terminal device. Alternatively, the timing at which the first access network device sends the fourth message to the first terminal device may be after the timing at which the first access network device sends the second message to the second terminal device, that is, it may be understood that the timing at which the second terminal device After receiving the second message and completing the establishment of the first DRB according to the second message, the second terminal device replies a completion message to the first access network device, and after the first access network device receives the completion message, the first access network device The device sends the fourth message to the first terminal device.

In other words, after the first access network device determines to transfer the target service to the second terminal device, the first access network device may release the second DRB used by the first terminal device to bear the target service. If there is currently no other service transmission between the first terminal device and the first access network device except the data interaction of the target service, the first access network device may directly release the RRC connection with the first terminal device, Make the first terminal device enter an idle state (also called an idle state) or an inactive state (also called an inactive state).

S504. The first access network device performs fallback processing on the first data packet of the target service to obtain the second data packet.

Wherein, the first access network device transmits the target service with the first terminal device based on the first protocol stack instance, the first access network device transmits the target service with the second terminal device based on the second protocol stack instance, and the first data packet is The data packets processed by the first protocol stack instance but not sent to the first terminal device. Rollback processing includes, but is not limited to, decryption operations and the like.

For example, please refer to FIG. 6 , which is a schematic diagram of an operation of rollback processing provided by the present application. It can be understood that the first access network device creates a protocol stack instance for each terminal device it serves, as shown in Figure 6, the first protocol stack instance corresponds to the first terminal device, and the second protocol stack instance Corresponding to the second terminal device. When the first access network device sends the data packet of the target service to the first terminal device, the process can be understood as: the first access network device receives the original data packet of the target service from the core network device; further, the first access network device receives the original data packet of the target service; A service data adaptation protocol (service data adaptation protocol, SDAP) entity and a PDCP entity in a protocol stack instance process the original data packet to obtain a first data packet, and cache the first data packet in the first protocol stack In the PDCP entity of the example, it is waiting to send to the first terminal device through a radio link layer control protocol (radio link control, RLC) entity. When service transfer occurs, there are still some first data packets in the PDCP entity of the first protocol stack instance that are not sent to the first terminal device. In order to ensure the continuity of the target service, the PDCP entity of the first protocol stack instance The first data packet in the entity still needs to be sent to the second terminal device, so it is necessary to perform rollback processing on the first data packet in the PDCP entity of the first protocol stack instance to obtain the original data packet of the target service (that is, the aforementioned first data packet) two packets). Through such a method, the continuous transmission of the target service can be guaranteed.

It should be noted that during the service transfer process, since the UPF network element does not change, the QoS flow to which the data of the target service belongs does not change, so when the data packets of the target service are transferred between two sets of protocol stack instances, the Information about the QoS flow corresponding to the data packet may be carried. Optionally, if multiple PDU sessions are involved, the data of the target service needs to be transferred to the SDAP entity corresponding to the PDU session to which the target service belongs.

S505. The first access network device sends the data packet of the target service to the second terminal device based on the first DRB.

The data packet of the target service sent by the first access network device to the second terminal device based on the first DRB includes the aforementioned second data packet, and the new data packet of the target service received by the first access network device from the core network device (i.e. A data packet that has not been received by the first access network device).

It should be understood that, in order to ensure the continuity and timing of data, the first access network device needs to send to the second terminal device the data packets that are processed back from the first protocol stack instance first, and then send the A new data packet of the target service received by the device from the core network device (that is, a data packet not received by the first access network device).

In the scenario where the service access network devices of the source terminal device and the destination terminal device are the same access network device, that is, the system architecture shown in Figure 1a above, and the control anchor point of service transfer is on the side of the access network device, please refer to As shown in FIG. 7 , FIG. 7 is a schematic flowchart of another service transfer method provided by the embodiment of the present application. In the scenario corresponding to the service transfer method shown in Figure 7, the service access network devices corresponding to the source terminal device (that is, the first terminal device) and the destination terminal device (that is, the second terminal device) are both first access network devices . As shown in Figure 7, the method execution subject of the service transfer method may be the first access network device or a chip in the first access network device, or the execution subject may be the first terminal device or a chip in the first terminal device , or the execution subject may be a core network device or a chip in the core network device. FIG. 7 uses the first terminal device, the first access network device, and the core network device as examples for illustration. in:

S701. When the first terminal device detects the second terminal device, the first terminal device sends a first message to the first access network device.

The first terminal device serves as the source terminal device carrying the target service of the target service. When the first terminal device discovers (or understands to detect) the second terminal device, after the first terminal device receives the service transfer instruction input by the user, the first terminal device The terminal device sends the first message to the first access network device. The first message includes one or more of the following information: the identifier of the second terminal device, the identifier of the first terminal device, the PIN identifier corresponding to the first terminal device, the index of the first terminal device in the PIN, the second The PIN identifier corresponding to the terminal device, the index of the second terminal device in the PIN, the PDU identifier corresponding to the target service, or the QoS flow identifier corresponding to the target service. For the explanation of each item of information in the first message, reference may be made to the relevant description in S401 above, and details will not be repeated here.

In a possible implementation, after the first access network device receives the first message from the first terminal device, the second terminal device is in a disconnected state, and the first access network device receives the paging message from the core network device , the paging message carries the identifier of the second terminal device. Further, the first access network device pages the second terminal device based on the paging message.

S702. The first access network device sends a third message to the core network device, where the third message is used to request transfer of the target service carried by the first terminal device to the second terminal device.

Wherein, the third message includes the identifier of the second terminal device, the identifier of the first terminal device, the PIN identifier of the personal Internet of Things network corresponding to the first terminal device, the index of the first terminal device in the PIN, the ID of the second terminal device One or more of the corresponding PIN identifier, the index of the second terminal device in the PIN, the identifier of the PDU corresponding to the target service, or the identifier of the QoS flow corresponding to the target service. For the explanation of each item of information in the third message, refer to the related description of each item of information in the first message in S401 above, and no more details are given here.

It should be known that the third message may be a request message or a notification (or indication) message, which is not specifically limited in this application. When the third message is a request message (that is, the third message is used to request that the target service carried by the first terminal device be transferred to the second terminal device), the core network device needs to send a request for the first access network device to the first access network device. Response messages for three messages. When the third message is a notification (or indication) message (that is, the third message is used to notify the core network device to transfer the target service carried by the first terminal device to the second terminal device), in this case, the core network The device may not send a response message to the third message to the first access network device.

In a possible implementation manner, the third message is a message directed to the first terminal device, and the third message further includes an identifier of the second terminal device. It can be understood that the third message sent by the first access network device (that is, the service transfer indication message) is an interface message of the first terminal device, and the third information carries the identifier of the second terminal device, so as to notify the core network device to transfer the second terminal device The PDU session or QoS flow corresponding to the target service of a terminal device is transferred to the target terminal device (that is, the second terminal device). Exemplarily, it is possible to transfer only part of the QoS flows under a PDU session, or transfer the entire PDU session. Of course, when the entire PDU session is transferred, all QoS flows in the PDU session are also transferred.

Or, in another optional implementation manner, the third message (ie, the service transfer indication message) is a message for the second terminal device, and the third message further includes the identifier of the first terminal device. It can be understood that the third message sent by the first access network device (that is, the service transfer instruction message) is an interface message of the second terminal device, and the third information carries the identifier of the first terminal device to notify the core network device to The destination terminal device (that is, the second terminal device) creates a PDU session or QoS flow corresponding to the target service, and the PDU session or QoS flow originates from the PDU session or QoS flow corresponding to the target service of the first terminal device.

S703. The first access network device receives an acknowledgment message from the core network device, where the acknowledgment message is used to respond to the third message.

After the core network device receives the service transfer instruction message sent by the first access network device (that is, the third message in S702), the core network device sends a confirmation message to the first access network device, and the confirmation message is used to confirm that the first terminal The target service carried by the device is transferred to the second terminal device.

S704. The first access network device sends a second message to the second terminal device, where the second message is used to establish a first DRB corresponding to the target service.

S705. The first access network device performs fallback processing on the first data packet of the target service to obtain the second data packet.

S706. The first access network device sends the data packet of the target service to the second terminal device based on the first DRB.

Specifically, for the specific implementation manners of S704-S706, reference may be made to the foregoing description of the specific implementation manners of S503-S505, which will not be repeated here.

In the scenario where the service access network devices of the source terminal device and the destination terminal device are different access network devices, that is, the system architecture shown in Figure 1b above, and the control anchor point of service transfer is on the core network device side, please refer to As shown in FIG. 8 , FIG. 8 is a schematic flowchart of another service transfer method provided by the embodiment of the present application. In the scenario corresponding to the service transfer method shown in Figure 8, the service access network device corresponding to the source terminal device (that is, the first terminal device) is the second access network device, and the destination terminal device (that is, the second terminal device) corresponds to the service access network device. The serving access network device is the first access network device. As shown in Figure 8, the method execution subject of the service transfer method may be the first access network device or a chip in the first access network device, or the execution subject may be the first terminal device or a chip in the first terminal device , or the execution subject may be a core network device or a chip in the core network device. FIG. 8 is illustrated by taking the first terminal device, the first access network device and the core network device as execution subjects as examples. in:

S801. When the first terminal device detects the second terminal device, the first terminal device sends a fifth message to the core network device.

The first terminal device serves as the source terminal device carrying the target service of the target service. When the first terminal device discovers (or understands to detect) the second terminal device, after the first terminal device receives the service transfer instruction input by the user, the first terminal device The terminal device sends a fifth message to the core network device through the second access network device, for example, the fifth message is a service transfer request message.

It should be known that the IP address of the second terminal device for the target service is the same as the IP address of the first terminal device for the target service. The PIN to which the first terminal device belongs when it carries the target service is the same as the PIN to which the second terminal belongs when it is set to carry the target service, and the first terminal device can perceive the PIN identifier of the PIN to which the second terminal device belongs when it is used to carry the target service, and Index of the second terminal device within the associated PIN. Therefore, the first access network device can obtain the PIN identifier corresponding to the second terminal device and the index of the second terminal device in the PIN from the first terminal device. Similarly, the second access network device can obtain the first PIN identifier from the second terminal device. The PIN identifier corresponding to the terminal device and the index of the first terminal device in the PIN.

S802. The first access network device receives the first message from the core network device.

After the core network device receives the fifth message from the first terminal device through the second access network device, the core network sends a first message to the first access network device, which can be understood as a PDU session establishment request message . After the first access network device receives the first message from the core network device, it may also send a response message to the core network device.

In an optional implementation manner, the first message from the core network device further includes indication information for indicating that the PDU session is transferred from another terminal device. Wherein, the indication information may be a character or an identifier. For example, in the PDU session establishment request message, the character A is used to indicate whether the PDU session is transferred from other terminal equipment. When the value of the character A is 0, then Indicates that the PDU session is transferred from other terminal equipment, and the value of the character A is 1, indicating that the PDU session is not transferred from other terminal equipment.

S803. The first access network device sends a second message to the second terminal device, where the second message is used to establish a first DRB corresponding to the target service.

Wherein, for the specific implementation manner of S803, reference may be made to the description of the specific implementation manner of S402 or S503 above, and details are not repeated here.

S804. The first information further includes indication information requesting the first forwarding address, and the first access network device sends the first forwarding address to the core network device.

In S802, the first information sent by the core network device to the first access network device also includes indication information of the first forwarding address, and the indication information is used by the core network device to request the first access network device to use its own address as The first forwarding address is returned. The first forwarding address can be understood as the address where the first access network device receives the third data packet. The third data packet is received by the second access network device from the core network device but has not yet been sent. A data packet to the first terminal device. Further, the first access network device sends the first forwarding address to the core network device after receiving the first message from the core network device.

It should be noted that, in the embodiment of the present application, only the execution timing of S804 is illustrated after the execution timing of S803, which should not be regarded as a limitation of the present application, that is to say, S804 can also be executed at the same time as S803 .

S805. The core network device sends the second forwarding address to the second access network device.

After the core network device receives the first forwarding address from the first access network device, the core network device sends the second forwarding address to the second access network device, so that the second access network device transmits the first forwarding address according to the second forwarding address. Three packets. Wherein, the second forwarding address may be the data receiving address of the core network device, or may be the data receiving address of the first core network device.

It should be noted that the second forwarding address is used to instruct the first terminal device to transmit the third data packet, and it can also be understood that the second forwarding address is associated with the PDU session corresponding to the target service transmitted by the first access network device, For example, when there are multiple PDU sessions corresponding to the target service transmitted by the first access network device, there should be multiple second forwarding addresses, and the second forwarding addresses correspond to the PDU sessions one by one. Similarly, there may be multiple first forwarding addresses, and the first forwarding addresses correspond to the PDU sessions of the target service one by one. The second forwarding address may be included in other messages sent by the core network device to the second access network device, which is not specifically limited here. For example, the core network device sends a request message to the second access network device (the request message is used to request the release of the PDU session or QoS flow of the first terminal device for the target service, or to request the release of the first terminal device and the second When accessing an RRC connection between network devices), the request message may carry the second forwarding address.

In other words, in one case, after the core network device receives the first forwarding address from the first access network device, the core network device uses the first forwarding address as the second forwarding address (that is, the second forwarding address is the second forwarding address). The data receiving address of an access network device) is sent to the second access network device. In another case, after the core network device receives the first forwarding address from the first access network device, the core network device uses its own data receiving address as the second forwarding address (that is, the second forwarding address is the first forwarding address of the core network device data receiving address), and send it to the second access network device.

S806. Based on the first forwarding address, the first access network device receives a third data packet of the target service from the second access network device or the core network device. Wherein, the third data packet is a data packet received by the second access network device from the core network device but not sent to the first terminal device.

In a possible situation, the core network device uses the first forwarding address as the second forwarding address (that is, the second forwarding address is the data receiving address of the first access network device), and sends the data to the second access network equipment. Further, the second access network device may directly send the third data packet to the first access network device according to the second forwarding address. In another possible situation, the core network device uses its own data receiving address as the second forwarding address (that is, the second forwarding address is the data receiving address of the core network device) to send to the second access network device. Further, the second access network device may send a third data packet to the core network device according to the second forwarding address; after receiving the third data packet, the core network device sends the third data packet to the first access network device based on the first forwarding address The third packet.

S807. The first access network device sends the data packet of the target service to the second terminal device based on the first DRB.

The first access network device sends the third data packet to the second terminal device based on the first DRB, and sends the new data packet of the target service received by the first access network device from the core network device (that is, the second access network device does not received packets).

It should be understood that, in order to ensure the continuity and timing of data, the first access network device needs to send the third data packet received from the second access network device to the second terminal device first, and then send the third data packet received by the first access network device to the second terminal device. A new data packet of the target service received by the device from the core network device (that is, a data packet not received by the second access network device).

In the scenario where the service access network devices of the source terminal device and the destination terminal device are different access network devices, that is, the system architecture shown in Figure 1b above, and the control anchor point of service transfer is on the side of the access network device, please Referring to FIG. 9 , FIG. 9 is a schematic flowchart of another service transfer method provided by an embodiment of the present application. In the scenario corresponding to the service transfer method shown in Figure 9, the service access network device corresponding to the source terminal device (that is, the first terminal device) is the second access network device, and the destination terminal device (that is, the second terminal device) corresponds to the service access network device. The serving access network device is the first access network device. As shown in Figure 9, the method execution subject of the service transfer method may be the first access network device or a chip in the first access network device, or the execution subject may be the second access network device or the second access network device. The chip in the device, or the execution subject may be the first terminal device or a chip in the first terminal device, or the execution subject may be a core network device or a chip in the core network device. FIG. 9 takes the first terminal device, the first access network device, the second access network device, and the core network device as an example for illustration. in:

S901. When the first terminal device detects the second terminal device, the first terminal device sends a fifth message to the second access network device.

The first terminal device serves as the source terminal device carrying the target service of the target service. When the first terminal device discovers (or understands to detect) the second terminal device, after the first terminal device receives the service transfer instruction input by the user, the first terminal device The terminal device sends a fifth message to the second access network device, for example, the fifth message is a service transfer request message. The fifth message includes one or more of the following information: the identifier of the second terminal device, the identifier of the first terminal device, the PIN identifier corresponding to the first terminal device, the index of the first terminal device in the PIN, the second The PIN identifier corresponding to the terminal device, the index of the second terminal device in the PIN, the PDU identifier corresponding to the target service, or the QoS flow identifier corresponding to the target service. For the explanation of each item of information in the fifth message, refer to the related description of each item of information in the first message in S401 above, and no more details are given here.

S902. The second access network device sends a third message to the core network device, where the third message is used to request transfer of the target service carried by the first terminal device to the second terminal device.

After receiving the fifth message from the first terminal device, the second access network device sends a third message to the core network device according to the first message, specifically, the third message may be a message directed at the first terminal device, the The third message also includes the identifier of the second terminal device; or, the third message (ie, the service transfer instruction message) is a message for the second terminal device, and the third message also includes the identifier of the first terminal device.

S903. The core network device sends a first message to the first access network device, where the first message is used to instruct to transfer the target service carried by the first terminal device to the second terminal device.

In an optional implementation manner, the first message (for example, a service transfer message) sent by the core network device is a message for the first terminal device, and the first message further includes an identifier of the second terminal device. Or, in another optional implementation manner, the first message (for example, a service transfer message) sent by the core network device is a message for the second terminal device, and the first message further includes the identifier of the first terminal device.

S904. The first access network device sends a second message to the second terminal device, where the second message is used to establish a first DRB corresponding to the target service.

S905. The first information further includes indication information requesting the first forwarding address, and the first access network device sends the first forwarding address to the core network device.

S906. The core network device sends the second forwarding address to the second access network device.

S907. Based on the first forwarding address, the first access network device receives a third data packet of the target service from the second access network device or the core network device.

S908. The first access network device sends the data packet of the target service to the second terminal device based on the first DRB.

Wherein, for the specific implementation manners of S904-S908, reference may be made to the foregoing description of the specific implementation manners of S803-S807, which will not be repeated here.

Referring to FIG. 10 , FIG. 10 shows a schematic structural diagram of a communication device according to an embodiment of the present application. The communication device shown in Figure 10 can be used to realize some or all functions of the terminal equipment in the embodiment corresponding to the above service transfer method, or the communication device shown in Figure 10 can be used to realize the first interface in the embodiment corresponding to the above service transfer method Part or all of the functions of the network access device, or the communication device shown in FIG. 10 may be used to implement part or all of the functions of the core network in the embodiment corresponding to the above service transfer method.

In one embodiment, the communication device shown in FIG. 10 can be used to implement some or all of the functions of the first access network device in the method embodiments described above in FIG. 4 , FIG. 5 , FIG. 7 , FIG. 8 or FIG. 9 . The device may be the first access network device, or a device in the first access network device, or a device that can be matched and used with the first access network device. Wherein, the communication transposition may also be a chip system. The communication device shown in FIG. 10 may include a communication module 1001, wherein:

The communication module 1001 is configured to receive a first message from the core network device or the first terminal device, where the first message is used to request that the target service carried by the first terminal device be transferred to the second terminal device; and send the message to the second terminal device A second message, where the second message is used to establish a first DRB corresponding to the target service; and send a data packet of the target service to the second terminal device based on the first DRB.

In a possible implementation manner, the first message comes from the first terminal device, and the communication module 1001 may also send a third message to the core network device, where the third message is used to request that the target service carried by the first terminal device be transferred to The second terminal device; the third message includes the identification of the second terminal device, the identification of the first terminal device, the PIN identification of the personal Internet of Things network corresponding to the first terminal device, the index of the first terminal device in the PIN, the second One or more of the PIN identifier corresponding to the terminal device, the index of the second terminal device in the PIN, the identifier of the packet data unit PDU corresponding to the target service, or the quality of service QoS flow identifier corresponding to the target service; the communication module 1001 receives from An acknowledgment message of the core network device, where the acknowledgment message is used to respond to the third message.

In a possible implementation manner, the communication module 1001 sends a fourth message to the first terminal device, where the fourth message is used to instruct the first terminal device to release the second DRB corresponding to the target service, or the fourth message is used to instruct The first terminal device releases the radio resource control RRC connection with the first access network device.

In a possible implementation manner, the communication device further includes a processing module 1002, the first access network device transmits the target service with the first terminal device based on the first protocol stack instance, and the first access network device transmits the target service based on the second protocol stack instance The target service is transmitted with the second terminal device, and the processing module 1002 performs rollback processing on the first data packet of the target service to obtain a second data packet. The first data packet is processed by the first protocol stack instance but not sent to the first A data packet of the terminal device: the communication module 1001 sends the second data packet to the second terminal device based on the first DRB.

In a possible implementation manner, the first message further includes indication information for requesting the first forwarding address, and the communication module 1001 sends the first forwarding address to the core network device.

In a possible implementation, the communication module 1001 receives the third data packet of the target service from the second access network device or the core network device based on the first forwarding address, and the third data packet is the second data packet of the second access network device A data packet received from the core network device but not sent to the first terminal device; the communication module 1001 sends a third data packet to the second terminal device based on the first DRB.

In a possible implementation manner, the second terminal device is in a non-connected state, and the communication module 1001 receives a paging message from the core network device, and the paging message carries an identifier of the second terminal device; based on the paging message, the processing module 1002, Paging the second terminal device.

In a possible implementation manner, the communication module 1001 acquires the PIN identifier corresponding to the first terminal device and the PIN identifier corresponding to the second terminal device from the core network device.

For a more detailed description of the communication module 1001 and the processing module 1002, reference may be made to the relevant description of the first access network device in the above method embodiment, and no further description is given here.

In an embodiment, the communication apparatus shown in FIG. 10 may be used to realize some or all functions of the terminal device in the method embodiments described in FIG. 4 , FIG. 5 , FIG. 7 , FIG. 8 or FIG. 9 . The device may be a terminal device, or a device in the terminal device, or a device that can be matched with the terminal device. Wherein, the communication transposition may also be a chip system. The communication device shown in FIG. 10 may include a communication module 1001 and a processing module 1002, wherein:

When the processing module 1002 detects the second terminal device, the communication module 1001 sends a first message to the core network device or the access network device, and the first message is used to request that the target service carried by the first terminal device be transferred to the second terminal device. The second terminal device, the access network device is the serving access network device of the first terminal device.

In a possible implementation, the communication module 1001 receives the fourth message from the access network device; the processing module 1002 releases the second data radio bearer DRB corresponding to the target service according to the fourth message, or releases the second data radio bearer DRB associated with the access network device. between radio resource control RRC connections.

For a more detailed description of the communication module 1001 and the processing module 1002, reference may be made to the relevant description of the first terminal device in the method embodiment above, and no further description is given here.

In an embodiment, the communication device shown in FIG. 10 may be used to implement some or all functions of the core network device in the method embodiments described in FIG. 4 , FIG. 5 , FIG. 7 , FIG. 8 or FIG. 9 . The device may be a core network device, or a device in the core network device, or a device that can be matched with the core network device. Wherein, the communication transposition may also be a chip system. The communication device shown in FIG. 10 may include a communication module 1001 and a processing module 1002, wherein:

The communication module 1001 sends a first message to the first access network device; the first message is used to request to transfer the target service carried by the first terminal device to the second terminal device; the first access network device is the second terminal device's service access network equipment;

Alternatively, the communication module 1001 receives a third message from the second access network device; the third message is used to request to transfer the target service carried by the first terminal device to the second terminal device; the second access network device is the first Service access network equipment for terminal equipment.

In a possible implementation manner, the first access network device is different from the second access network device, the first message further includes indication information for requesting the first forwarding address, and the communication module 1001 receives a message from the first access network device The first forwarding address; based on the first forwarding address, sending the second forwarding address to the second access network device, where the second forwarding address is the first forwarding address or the data receiving address of the core network device.

In a possible implementation, the second forwarding address is the data receiving address of the core network device, and the communication module 1001 receives the third data packet from the second access network device, and the third data packet is the address of the second access network device. The data packet received by the device from the core network device but not sent to the first terminal device; the communication module 1001 sends the third data packet to the first access network device based on the first forwarding address.

In a possible implementation manner, the communication module 1001 sends the PIN identifier corresponding to the first terminal device and the PIN identifier corresponding to the second terminal device to the first access network device.

For a more detailed description of the communication module 1001 and the processing module 1002, reference may be made to the relevant description of the core network device in the above method embodiment, and no further description is given here.

Please refer to FIG. 11 . FIG. 11 is a schematic structural diagram of a communication device 1100 provided in the present application. The communication device 1100 includes a processor 1110 and an interface circuit 1120 . The processor 1110 and the interface circuit 1120 are coupled to each other. It can be understood that the interface circuit 1120 may be a transceiver or an input-output interface. Optionally, the communication device 1100 may further include a memory 1130 for storing instructions executed by the processor 1110 or storing input data required by the processor 1110 to execute the instructions or storing data generated by the processor 1110 after executing the instructions.

When the communication device 1100 is used to implement the methods in the above method embodiments, the processor 1110 may be used to execute the functions of the processing module 1002, and the interface circuit 1120 may be used to execute the functions of the communication module 1001 above.

When the above communication device is a chip applied to the first access network device, the chip of the first access network device implements the functions of the first access network device in the above method embodiment. The first access network device receives information from other modules (such as radio frequency modules or antennas) in the first access network device, and the information is sent by the terminal device to the first access network device; or, the first access network device The network device chip sends information to other modules (such as radio frequency modules or antennas) in the first access network device, and the information is sent by the first access network device to the terminal device.

When the above communication device is a chip applied to a terminal device, the terminal device chip implements the functions of the terminal device in the above method embodiment. The terminal device chip receives information from other modules (such as radio frequency modules or antennas) in the terminal device, and the information is sent to the terminal device by the first access network device or other network devices; or, the terminal device chip sends information to the terminal device Other modules (such as radio frequency modules or antennas) of the terminal device send information, and the information is sent by the terminal device to the first access network device or other network devices.

When the above communication device is a chip applied to core network equipment, the core network equipment chip implements the functions of the core network equipment in the above method embodiments.

It can be understood that the processor in the embodiments of the present application may be a central processing unit (central processing unit, CPU), and may also be other general processors, digital signal processors (digital signal processor, DSP), application specific integrated circuits (application specific integrated circuit, ASIC), field programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. A general-purpose processor can be a microprocessor, or any conventional processor.

The method steps in the embodiments of the present application may be implemented by means of hardware, or may be implemented by means of a processor executing software instructions. The software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory (random access memory, RAM), flash memory, read-only memory (Read-Only Memory, ROM), programmable read-only memory (programmable ROM) , PROM), erasable programmable read-only memory (erasable PROM, EPROM), electrically erasable programmable read-only memory (electrically EPROM, EEPROM), register, hard disk, mobile hard disk, CD-ROM or known in the art any other form of storage medium. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be a component of the processor. The processor and storage medium can be located in the ASIC. In addition, the ASIC may be located in the access network device or the terminal device. Certainly, the processor and the storage medium may also exist in the first access network device or the terminal device as discrete components.

In the above embodiments, all or part of them may be implemented by software, hardware, firmware or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product comprises one or more computer programs or instructions. When the computer program or instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present application are executed in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices. The computer program or instructions may be stored in or transmitted via a computer-readable storage medium. 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 integrating one or more available media. The available medium may be a magnetic medium, such as a floppy disk, a hard disk, or a magnetic tape; it may also be an optical medium, such as a DVD; it may also be a semiconductor medium, such as a solid state disk (solid state disk, SSD).

In each embodiment of the present application, if there is no special explanation and logical conflict, the terms and/or descriptions between different embodiments are consistent and can be referred to each other, and the technical features in different embodiments are based on their inherent Logical relationships can be combined to form new embodiments.

It can be understood that the various numbers involved in the embodiments of the present application are only for convenience of description, and are not used to limit the scope of the embodiments of the present application. The size of the serial numbers of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its functions and internal logic.

The embodiment of the present application also provides a computer-readable storage medium, the computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed, the first terminal device or the first interface in the above method embodiments The method performed by the network access device or the core network device is realized.

The embodiment of the present application also provides a computer program product, the computer program product includes a computer program, when the computer program is executed, the first terminal device or the first access network device or the core network device in the above method embodiment executes the method is implemented.

An embodiment of the present application further provides a communication system, where the communication system includes a first terminal device, a first access network device, and a core network device. Wherein, the first terminal device is configured to execute the method executed by the first terminal device in the foregoing method embodiments. The first access network device is configured to execute the method executed by the first access network device in the foregoing method embodiments. The core network device is configured to execute the method performed by the core network device in the foregoing method embodiments.

It should be noted that for the foregoing method embodiments, for the sake of simple description, they are expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited by the described action sequence. Depending on the application, certain steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification belong to preferred embodiments, and the actions and modules involved are not necessarily required by this application.

The descriptions of the various embodiments provided in this application can refer to each other, and the descriptions of each embodiment have their own emphases. For the parts that are not described in detail in a certain embodiment, you can refer to the relevant descriptions of other embodiments. For the convenience and brevity of description, for example, regarding the functions of the devices and equipment and the executed steps provided by the embodiments of the present application, reference may be made to the relevant descriptions of the method embodiments of the present application. May be cross-referenced, combined or cited.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit it; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present application. scope.

Claims

A business transfer method, characterized in that the method comprises:

The first access network device receives a first message from a core network device or a first terminal device, where the first message is used to request transfer of a target service carried by the first terminal device to a second terminal device;

The first access network device sends a second message to the second terminal device, where the second message is used to establish a first data radio bearer DRB corresponding to the target service;

The first access network device sends the data packet of the target service to the second terminal device based on the first DRB.
The method according to claim 1, wherein the first message is from the first terminal device, and the method further comprises:

The first access network device sends a third message to the core network device, where the third message is used to request that the target service carried by the first terminal device be transferred to the second terminal device; the first The three messages include the identifier of the second terminal device, the identifier of the first terminal device, the PIN identifier of the personal Internet of Things network corresponding to the first terminal device, the index of the first terminal device in the PIN, the One or more of the PIN identifier corresponding to the second terminal device, the index of the second terminal device in the PIN, the identifier of the packet data unit PDU corresponding to the target service, or the quality of service QoS flow identifier corresponding to the target service kind;

The first access network device receives an acknowledgment message from the core network device, where the acknowledgment message is used to respond to the third message.
The method according to claim 1 or 2, characterized in that the method further comprises:

The first access network device sends a fourth message to the first terminal device, where the fourth message is used to instruct the first terminal device to release the second DRB corresponding to the target service, or, the first Four messages are used to instruct the first terminal device to release the radio resource control RRC connection with the first access network device.
The method according to any one of claims 1-3, wherein the first access network device transmits the target service with the first terminal device based on a first protocol stack instance, and the first access network device The network access device transmits the target service with the second terminal device based on the second protocol stack instance, and the first access network device sends data of the target service to the second terminal device based on the first DRB Before the package, the method also includes:

The first access network device performs rollback processing on the first data packet of the target service to obtain a second data packet, the first data packet is processed by the first protocol stack instance but not sent to the Describe the data packet of the first terminal device;

The first access network device sending the data packet of the target service to the second terminal device based on the first DRB includes:

The first access network device sends the second data packet to the second terminal device based on the first DRB.
The method according to claim 1, wherein the serving access network device of the second terminal device is the first access network device, and the serving access network device of the first terminal device is the second access network device For a network access device, the first message is from the core network device.
The method according to claim 5, wherein the first message further includes indication information for requesting the first forwarding address, and the method comprises:

The first access network device sends the first forwarding address to the core network device.
The method according to claim 6, wherein before the first access network device sends the data packet of the target service to the second terminal device based on the first DRB, the method further comprises:

The first access network device receives a third data packet of the target service from the second access network device or the core network device based on the first forwarding address, where the third data packet is A data packet received by the second access network device from the core network device but not sent to the first terminal device;

The first access network device sending the data packet of the target service to the second terminal device based on the first DRB includes:

The first access network device sends the third data packet to the second terminal device based on the first DRB.
The method according to any one of claims 1-7, wherein the second terminal device is in a non-connected state, and the first access network device receives the first After the message, the method also includes:

The first access network device receives a paging message from the core network device, where the paging message carries the identifier of the second terminal device;

The first access network device pages the second terminal device based on the paging message.
The method according to any one of claims 1-8, wherein the first message includes one or more of the following information: the identity of the second terminal device, the ID of the first terminal device, the PIN ID corresponding to the first terminal device, the index of the first terminal device in the PIN, the PIN ID corresponding to the second terminal device, the index of the second terminal device in the PIN, the target The identifier of the PDU corresponding to the service or the identifier of the QoS flow corresponding to the target service.
The method according to any one of claims 1-9, wherein the first message comes from the core network device,

The first message is a message directed at the first terminal device, and the first message further includes an identifier of the second terminal device; or,

The first message is a message directed at the second terminal device, and the first message further includes an identifier of the first terminal device.
The method according to any one of claims 1-10, wherein before the first access network device receives the first message from the core network device or the first terminal device, the method further comprises:

The first access network device acquires the PIN identifier corresponding to the first terminal device and the PIN identifier corresponding to the second terminal device from the core network device.
The method according to any one of claims 1-11, wherein the first terminal device and the second terminal device belong to the same PIN.
The method according to any one of claims 1-12, characterized in that, the IP address of the second terminal device for the target service is the same as the IP address of the first terminal device for the target service.
A business transfer method, characterized in that the method includes:

When the first terminal device detects the second terminal device, the first terminal device sends a first message to the core network device or the access network device, and the first message is used to request that the first terminal device The carried target service is transferred to the second terminal device, and the access network device is the serving access network device of the first terminal device.
The method according to claim 14, wherein the method further comprises:

The first terminal device receives a fourth message from the access network device;

The first terminal device releases the second data radio bearer DRB corresponding to the target service according to the fourth message, or releases the radio resource control RRC connection with the access network device.
The method according to claim 14 or 15, wherein the first message includes one or more of the following information: the identifier of the second terminal device, the identifier of the first terminal device, the The personal internet of things network PIN identifier corresponding to the first terminal device, the index of the first terminal device in the PIN, the PIN identifier corresponding to the second terminal device, the index of the second terminal device in the PIN, the target The identifier of the packet data unit PDU corresponding to the service or the identifier of the quality of service QoS flow corresponding to the target service.
The method according to any one of claims 14-16, wherein the first terminal device and the second terminal device belong to the same PIN.
The method according to any one of claims 14-17, wherein the IP address of the second terminal device for the target service is the same as the IP address of the first terminal device for the target service.
A business transfer method, characterized in that the method comprises:

The core network device sends a first message to the first access network device; the first message is used to request to transfer the target service carried by the first terminal device to the second terminal device; the first access network device is A service access network device of the second terminal device;

Alternatively, the core network device receives a third message from the second access network device; the third message is used to request transfer of the target service carried by the first terminal device to the second terminal device; the second The access network device is the serving access network device of the first terminal device.
The method according to claim 19, wherein the first access network device and the second access network device are the same access network device.
The method according to claim 19, wherein the first access network device is different from the second access network device, and the first message further includes indication information for requesting a first forwarding address, so After the core network device sends the first message to the first access network device, the method further includes:

The core network device receives the first forwarding address from the first access network device;

The core network device sends a second forwarding address to the second access network device based on the first forwarding address, and the second forwarding address is the first forwarding address or the data receiving address of the core network device address.
The method according to claim 21, wherein the second forwarding address is the data receiving address of the core network device, and the method further comprises:

The core network device receives a third data packet from the second access network device, and the third data packet is received by the second access network device from the core network device but not sent to the second access network device. A data packet of a terminal device;

The core network device sends the third data packet to the first access network device based on the first forwarding address.
The method according to any one of claims 19-22, wherein the first message includes one or more of the following information: the identity of the second terminal device, the ID of the first terminal device, the PIN ID corresponding to the first terminal device, the index of the first terminal device in the PIN, the PIN ID corresponding to the second terminal device, the index of the second terminal device in the PIN, the target The identifier of the PDU corresponding to the service or the QoS flow identifier corresponding to the target service;

Alternatively, the third message includes one or more of the following information: the identifier of the second terminal device, the identifier of the first terminal device, the PIN identifier corresponding to the first terminal device, the An index of a terminal device in a PIN, a PIN identifier corresponding to a second terminal device, an index of the second terminal device in a PIN, an identifier of a PDU corresponding to the target service, or a QoS flow identifier corresponding to the target service.
The method according to any one of claims 19-23, wherein,

The first message is a message directed at the first terminal device, and the first message further includes an identifier of the second terminal device; or,

The first message is a message directed at the second terminal device, and the first message further includes an identifier of the first terminal device.
The method according to any one of claims 19-24, wherein,

The third message is a message directed at the first terminal device, and the third message further includes an identifier of the second terminal device; or,

The third message is a message directed at the second terminal device, and the third message further includes an identifier of the first terminal device.
The method according to any one of claims 19-25, wherein the method further comprises:

The core network device sends the PIN identifier corresponding to the first terminal device and the PIN identifier corresponding to the second terminal device to the first access network device.
The method according to any one of claims 19-26, wherein the first terminal device and the second terminal device belong to the same PIN.
The method according to any one of claims 19-27, wherein the IP address of the second terminal device for the target service is the same as the IP address of the first terminal device for the target service.
A communication device, characterized in that it includes a module for performing the method according to any one of claims 1-13; or, includes a module for performing the method according to any one of claims 14-18 or, comprising a module for performing the method according to any one of claims 19-28.
A communication device, characterized in that it includes a processor and an interface circuit, the interface circuit is used to receive signals from other communication devices other than the communication device and transmit them to the processor or transfer signals from the processor The signal is sent to other communication devices other than the communication device, and the processor is used to implement the method described in any one of claims 1-13 or 14-18 or 19-28 through a logic circuit or executing code instructions method.
A communication system, characterized in that the communication system includes a first terminal device, a first access network device, and a core network device.
A computer-readable storage medium, characterized in that computer programs or instructions are stored in the storage medium, and when the computer programs or instructions are executed by a communication device, the implementation of claims 1-13 or 14-18 or 19 - the method described in any one of 28.
A computer program product, characterized in that when the computer reads and executes the computer program product, the computer is made to perform the method described in any one of claims 1-13 or 14-18 or 19-28.