# US 2021/0345237 A1 · Communication Method and Communications Apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0345237 A1 - Document ID: US20210345237A1 - Status: Published application - Kind: A1 - Application number: 17/369,501 - Filed: 2021-07-07 - Published: 2021-11-04 - Earliest claimed: 2019-01-09 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Cuili Ge; Yanmei Yang; Jiangwei Ying - Web page: https://patentgrep.com/patent/US20210345237A1 ## CPC - H04W 48/18: Selecting a network or a communication service - H04W 4/40: for vehicles, e.g. vehicle-to-pedestrians [V2P] - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 36/0055: {Transmission or use of information for re-establishing the radio link} - H04W 76/14: Direct-mode setup - H04W 76/15: Setup of multiple wireless link connections - H04W 76/23: Manipulation of direct-mode connections - H04W 92/10: between terminal device and access point, i.e. wireless air interface - H04W 92/18: between terminal devices - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A communication method performed by a first terminal device, where the method includes: receiving communication quality reference information of a Uu interface from a network device; and determining, based on the communication quality reference information of the Uu interface and communication quality information of a PC5 interface, a communication mode used to send target data to a second terminal device, where the communication mode is any one of the following: a Uu interface communication mode, a PC5 interface communication mode, or a multipath communication mode, where the PC5 interface is an interface for direct communication between the first terminal device and the second terminal device, and where communications interfaces in the multipath communication mode include the PC5 interface and the Uu interface. ## Claims ### Claim 1 A communication method, comprising: receiving, by a first terminal device, communication quality reference information of a Uu interface from a network device; and determining, by the first terminal device based on the communication quality reference information of the Uu interface and communication quality information of a PC5 interface, a communication mode to send target data to a second terminal device, wherein the communication mode is any one of a Uu interface communication mode or a PC5 interface communication mode, and wherein the PC5 interface is for direct communication between the first terminal device and the second terminal device. ### Claim 2 (depends on 1) The communication method according to claim 1, wherein the communication quality reference information of the Uu interface comprises at least one of: first communication quality information of a first Uu interface of the first terminal device; or second communication quality information of a second Uu interface of the second terminal device. ### Claim 3 (depends on 1) The communication method according to claim 1, further comprising requesting, by the first terminal device from the network device, the communication quality reference information of the Uu interface. ### Claim 4 (depends on 3) The communication method according to claim 3, wherein requesting the communication quality reference information of the Uu interface comprises sending, by the first terminal device, a request message to the network device, wherein the request message requests the communication quality reference information of the Uu interface, and wherein the request message comprises identity information of the first terminal device. ### Claim 5 (depends on 1) The communication method according to claim 1, wherein the network device is a vehicle-to-everything (V2X) application enabler (VAE) server. ### Claim 6 A communication method, comprising: obtaining, by a network device, communication quality reference information of a Uu interface, wherein the Uu interface comprises a first Uu interface of a first terminal device and/or a second Uu interface of a second terminal device, wherein the first terminal device is a transmit end of target data, and wherein the second terminal device is a receive end of the target data; and sending, by the network device, the communication quality reference information of the Uu interface to the first terminal device. ### Claim 7 (depends on 6) The communication method according to claim 6, wherein the communication quality reference information of the Uu interface comprises at least one of: first communication quality information of the first Uu interface of the first terminal device; or second communication quality information of the second Uu interface of the second terminal device. ### Claim 8 (depends on 7) The communication method according to claim 7, wherein obtaining the communication quality reference information of the Uu interface comprises: receiving, by the network device, a request message from the first terminal device, wherein the request message requests the communication quality reference information; and obtaining, by the network device, the communication quality reference information based on the request message. ### Claim 9 (depends on 8) The communication method according to claim 8, wherein the request message comprises identity information of the first terminal device. ### Claim 10 (depends on 6) The communication method according to claim 6, wherein the network device is a vehicle-to-everything (V2X) application enabler (VAE) server. ### Claim 11 A communications apparatus, comprising: a memory configured to store instructions; and at least one processor in communication with the memory and configured to execute the instructions to: receive communication quality reference information of a Uu interface from a network device; and determine, based on the communication quality reference information of the Uu interface and communication quality information of a PC5 interface, a communication mode to send target data to a second terminal device, wherein the communication mode is any one of a Uu interface communication mode or a PC5 interface communication mode, and wherein the PC5 interface is for direct communication between a first terminal device and the second terminal device. ### Claim 12 (depends on 11) The communications apparatus according to claim 11, wherein the communication quality reference information of the Uu interface comprises at least one of: first communication quality information of a first Uu interface of the first terminal device; or second communication quality information of a second Uu interface of the second terminal device. ### Claim 13 (depends on 11) The communications apparatus according to claim 11, wherein the at least one processor is further configured to execute the instructions to request the communication quality reference information of the Uu interface from the network device. ### Claim 14 (depends on 13) The communications apparatus according to claim 13, wherein the at least one processor is further configured to execute the instructions to send a request message to the network device, wherein the request message requests the communication quality reference information of the Uu interface, and wherein the request message comprises identity information of the first terminal device. ### Claim 15 (depends on 11) The communications apparatus according to claim 11, wherein the network device is a vehicle-to-everything (V2X) application enabler (VAE) server. ### Claim 16 A communications apparatus, comprising: a memory configured to store instructions; and at least one processor in communication with the memory and configured to execute the instructions to: obtain communication quality reference information of a Uu interface, wherein the Uu interface comprises a first Uu interface of a first terminal device and/or a second Uu interface of a second terminal device, wherein the first terminal device is a transmit end of target data, and wherein the second terminal device is a receive end of the target data; and send the communication quality reference information of the Uu interface to the first terminal device. ### Claim 17 (depends on 16) The communications apparatus according to claim 16, wherein the communication quality reference information of the Uu interface comprises at least one of: first communication quality information of the first Uu interface of the first terminal device; or second communication quality information of the second Uu interface of the second terminal device. ### Claim 18 (depends on 17) The communications apparatus according to claim 17, wherein the at least one processor is further configured to execute the instructions to: receive a request message from the first terminal device, wherein the request message requests the communication quality reference information of the Uu interface; and obtain the communication quality reference information of the Uu interface based on the request message. ### Claim 19 (depends on 18) The communications apparatus according to claim 18, wherein the request message comprises identity information of the first terminal device. ### Claim 20 (depends on 16) The communications apparatus according to claim 16, wherein the communications apparatus is a vehicle-to-everything (V2X) application enabler (VAE) server.