US-12621726-B2 - Relay service based communication method and terminal device

US12621726B2US 12621726 B2US12621726 B2US 12621726B2US-12621726-B2

Abstract

The communication method includes the following. A first terminal device receives first information from a first network device, where the first information indicates that the first terminal device is to hand over to a second network device. The first terminal device transmits second information to a second terminal device, where the second information indicates that the second terminal device is to hand over to the second network device, and the first terminal device provides relay service to the second terminal device.

Inventors

Qianxi Lu

Assignees

GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD.

Dates

Publication Date: 20260505
Application Date: 20221228

Claims (16)

1 . A communication method, comprising: determining, by a first terminal device, according to first information, to transmit second information to a second terminal device, wherein the first information is received from a first network device, and the first information indicates that the first terminal device is to hand over to the second network device; transmitting, by the first terminal device, the second information to the second terminal device, the second information indicating that the second terminal device is to hand over to a second network device, and the first terminal device providing relay service to the second terminal device; and transmitting, by the first terminal device, third information to the second terminal device, wherein the third information indicates that a communication connection between the first terminal device and the second terminal device is to be disconnected.
2 . The method of claim 1 , further comprising: receiving, by the first terminal device, the second information from a first network device.
3 . The method of claim 1 , wherein the first information further indicates that the first terminal device disconnects the communication connection with the second terminal device.
4 . The method of claim 1 , further comprising: transmitting, by the first terminal device, information to the second terminal device, wherein the information indicates to the second network device handover complete of the first terminal device.
5 . The method of claim 1 , further comprising: receiving, by the first terminal device, a handover complete message from the second terminal device, wherein the handover complete message is used to confirm that handover of the second terminal device to the second network device is completed; and transmitting, by the first terminal device, the handover complete message to the second network device.
6 . A communication method, comprising: receiving, by a second terminal device, second information from a first terminal device, the second information indicating that the second terminal device to hand over to a second network device, and the first terminal device providing relay service to the second terminal device, wherein the second information is determined to be transmitted to the second terminal device by the first terminal device according to first information, wherein the first information is received from a first network device by the first terminal device, and the first information indicates that the first terminal device is to hand over to the second network device; and receiving, by the second terminal device, third information from the first terminal device, wherein the third information indicates that a communication connection between the first terminal device and the second terminal device is to be disconnected.
7 . The method of claim 6 , further comprising: transmitting, by the second terminal device, fourth information to the first terminal device, wherein the fourth information indicates that a communication connection between the first terminal device and the second terminal device is to be disconnected.
8 . The method of claim 7 , wherein the second information further indicates that the second terminal device disconnects the communication connection between the first terminal device and the second terminal device.
9 . The method of claim 6 , further comprising: starting, by the second terminal device, a first timer after the second information is received, wherein a timing duration of the first timer is a first time-interval.
10 . The method of claim 9 , further comprising: determining, by the second terminal device, that handover of the second terminal device to the second network device fails, when the first timer expires.
11 . A terminal device configured to perform the method of claim 6 .
12 . A terminal device, comprising: a transceiver; a processor; and a memory storing computer programs which, when executed by the processor, are operable with the processor to: determine, according to first information received by the transceiver, to transmit second information to a second terminal device, wherein the first information is received from a first network device, and the first information indicates that the first terminal device is to hand over to the second network device; cause the transceiver to transmit second information to a second terminal device, the second information indicating that the second terminal device is to hand over to a second network device, and the first terminal device providing relay service to the second terminal device; cause the transceiver to transmit third information to the second terminal device, wherein the third information indicates that a communication connection between the first terminal device and the second terminal device is to be disconnected.
13 . The terminal device of claim 12 , wherein the transceiver is further configured to: receive the second information from a first network device.
14 . The terminal device of claim 12 , wherein the first information further indicates that the first terminal device disconnects the communication connection with the second terminal device.
15 . The terminal device of claim 12 , wherein the transceiver is further configured to: transmit information to the second terminal device, wherein the information indicates to the second network device handover complete of the first terminal device.
16 . The terminal device of claim 12 , wherein the transceiver is further configured to: receive a handover complete message from the second terminal device, wherein the handover complete message is used to confirm that handover of the second terminal device to the second network device is completed; and transmit the handover complete message to the second network device.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) This application is a continuation of International Application No. PCT/CN2020/119733, filed Sep. 30, 2020, the entire disclosure of which is incorporated herein by reference. TECHNICAL FIELD Implementations of this disclosure relate to communication technology, and particularly to a communication method and a terminal device. BACKGROUND In the field of communication, besides communication through a cellular communication interface, i.e. user equipment (UE)-universal mobile telecommunication system (UMTS) terrestrial radio access network (UE-UTRAN, Uu) interface, UEs can also directly communicate with each other through a direct-connection communication interface, i.e. proximity-based service (ProSe) communication (interface) 5 (PC5 interface), where the PC5 interface can be used for information transmission of a data plane and a control plane, etc. For example, in device-to-device (D2D) communication, UEs can directly communicate with each other, and can share spectrum resources with a cell terminal under control of a cell network, which can efficiently improve spectrum resource utilization. If the UE is outside a network coverage, or a communication quality between the UE and a radio access network (RAN) is low, an indirect communication mode, i.e. relay communication with aid of a communication architecture of PC5 interface and Uu interface, can be used. Specifically, data of the UE (referred to as a remote UE) can be transferred to a relay UE through a PC5 interface, and then the relay UE transmits the data of the remote UE to a network through a Uu interface between the relay UE and a network device. At present, there is still absence of a mobility management solution regarding the case where a UE providing relay service moves, for example, how to handle a communication connection between the relay UE and the remote UE when the relay UE needs to hand over from the connected network device due to movement. SUMMARY In a first aspect, a communication method is provided in implementations of the disclosure. The method includes the following. The first terminal device receives first information from a first network device, where the first information indicates that the first terminal device is to hand over to a second network device. The first terminal device transmits second information to a second terminal device, where the second information indicates that the second terminal device is to hand over to the second network device, and the first terminal device provides relay service to the second terminal device. In a second aspect, a communication method is provided in implementations of the disclosure. The method includes the following. The second terminal device receives second information from a first terminal device, where the second information indicates that the second terminal device is to hand over to a second network device, and the first terminal device provides relay service to the second terminal device. In a third aspect, a terminal device is further provided in implementations of the disclosure. The terminal device includes a processor, a memory, and a transceiver. The memory is configured to store computer-executable instructions. The processor is configured to execute the computer-executable instructions stored in the memory, to: cause the transceiver to receive first information from a first network device, the first information indicating that a first terminal device is to hand over to a second network device; determine, according to the first information, to hand over to the second network device; cause the transceiver to transmit second information to a second terminal device, the second information indicating that the second terminal device is to hand over to the second network device, and the first terminal device providing relay service to the second terminal device. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic architectural diagram of a communication system to which the disclosure is applicable. FIG. 2 is a schematic flowchart of a communication method provided in implementations of the disclosure. FIG. 3 is another schematic flowchart of a communication method provided in implementations of the disclosure. FIG. 4 is another schematic flowchart of a communication method provided in implementations of the disclosure. FIG. 5 is a schematic block diagram illustrating an example of a communication apparatus according to the disclosure. FIG. 6 is a schematic structural diagram illustrating an example of a terminal device according to the disclosure. FIG. 7 is a schematic structural diagram illustrating an example of a network device according to the disclosure. DETAILED DESCRIPTION Technical solutions of the disclosure will be elaborated below with reference to the accompanying drawings. Implementations of the disclosure provide a communication method and a communication apparatus, which can improve resource utilization and reduce powe