# US 11,451,326 B2 · Method for determining transmission mode in sidelink, terminal apparatus, and network apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,451,326 B2 - Document ID: US11451326B2 - Status: Granted - Kind: B2 - Application number: 17/224,640 - Filed: 2021-04-07 - Published: 2021-07-22 - Granted: 2022-09-20 - Earliest claimed: 2018-10-29 - Assignees: Guangdong Oppo Mobile Telecommunications Corp., Ltd. - Applicants: Guangdong Oppo Mobile Telecommunications Corp., Ltd. - Inventors: Zhenshan Zhao; Huei-Ming Lin; Qianxi Lu - Web page: https://patentgrep.com/patent/US11451326B2 ## CPC - H04L 41/0893: Assignment of logical groups to network elements - H04L 1/0025: {Transmission of mode-switching indication} - H04L 41/0803: Configuration setting - H04L 41/0806: for initial configuration or provisioning, e.g. plug-and-play - H04W 76/14: Direct-mode setup - H04W 4/46: for vehicle-to-vehicle communication [V2V] - H04W 92/18: between terminal devices - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract The present disclosure relates to a method for determining a transmission mode of a sidelink, a terminal apparatus, and a network apparatus. The method includes: a first terminal apparatus determining a first transmission mode from multiple transmission modes; and the first terminal apparatus performing, by adopting the first transmission mode, sidelink communications with other terminal apparatuses. The method for determining a transmission mode of a sidelink, the terminal apparatus, and the network apparatus in the present disclosure enable a terminal apparatus to adopt a suitable transmission mode for sidelink communications. ## Claims ### Claim 1 A method for determining a transmission mode of a sidelink, comprising: sending, by a first terminal device, a first message to a network device, wherein the first message comprises group identifier information of a terminal device group where the first terminal device is located, or identification information of a second terminal device, wherein the second terminal device is a terminal device which performs unicast communication with the first terminal device; receiving, by the first terminal device, first configuration information sent by the network device, wherein the first configuration information is used for indicating a first transmission mode; determining, by the first terminal device, the first transmission mode in a plurality of transmission modes based on the first configuration information; and adopting, by the first terminal device, the first transmission mode to perform a sidelink communication with another terminal device, wherein the first configuration information comprises: type information of unicast communication, multicast communication or broadcast communication, Quality of Service (QoS) attribute information, and the group identification information of the terminal device group where the first terminal is located, wherein the transmission mode comprises: mode 1 or mode 2, wherein the mode 1 is that the network device allocates transmission resources for the first terminal device, and the mode 2 is that the terminal device selects the transmission resources randomly or by sensing. ### Claim 2 (depends on 1) The method of claim 1, wherein if the first terminal device is not a group head in the terminal device group, group head information comprises identification information of the group head in the terminal device group; or if the first terminal device is the group head in the terminal device group, the group head information is used for indicating that the first terminal device is the group head in the terminal device group. ### Claim 3 (depends on 1) The method of claim 1, wherein if the second terminal device is located outside a cell coverage area, first indication information is used for indicating that the second terminal device is located outside the cell coverage area; or if the second terminal device is located within the cell coverage area, the first indication information comprises cell identification information of a cell where the second terminal device is located; or if the second terminal device is located outside a coverage area of a cell where the first terminal device is located, the first indication information is used for indicating that the second terminal device is located outside the coverage area of the cell where the first terminal device is located and/or the first indication information comprises the cell identification information of the cell where the second terminal device is located; or if the second terminal device is located within the coverage area of the cell where the first terminal device is located, the first indication information is used for indicating that the second terminal device is located in the cell where the first terminal device is located. ### Claim 4 (depends on 3) The method of claim 3, further comprising: receiving, by the first terminal device, second information sent by the second terminal device. ### Claim 5 (depends on 4) The method of claim 4, wherein the second information is carried in a sidelink transmission channel, and the sidelink transmission channel is a Physical Sidelink Control Channel (PSCCH) or a Physical Sidelink Shared Channel (PSSCH). ### Claim 6 (depends on 1) The method of claim 1, further comprising: sending, by the first terminal device, second configuration information to the second terminal device, wherein the second configuration information is used for indicating the second terminal device to adopt the first transmission mode to perform the sidelink communication. ### Claim 7 (depends on 1) The method of claim 1, wherein the first message is carried in uplink control information, a Media Access Control Control Element (MAC CE), or a Radio Resource Control (RRC) signaling. ### Claim 8 (depends on 1) The method of claim 1, wherein the first configuration information further comprises the identification information of the second terminal device which performs unicast communication with the first terminal device. ### Claim 9 (depends on 1) The method of claim 1, wherein the first configuration information is carried in broadcast information, or RRC signaling. ### Claim 10 A method for determining a transmission mode of a sidelink, comprising: receiving a first message sent by a first terminal device, wherein the first message comprises group identifier information of a terminal device group where the first terminal device is located, or identification information of a second terminal device, wherein the second terminal device is a terminal device which performs unicast communication with the first terminal device; determining a first transmission mode in a plurality of transmission modes according to the first message; and sending first configuration information to the first terminal device, wherein the first configuration information is used for indicating the first terminal device to adopt the first transmission mode to perform the sidelink communication with another terminal device, wherein the first configuration information comprises: type information of unicast communication, multicast communication or broadcast communication, Quality of Service (QoS) attribute information, and the group identification information of the terminal device group where the first terminal is located, wherein the transmission mode comprises: mode 1 or mode 2, wherein the mode 1 is that the network device allocates transmission resources for the first terminal device, and the mode 2 is that the terminal device selects the transmission resources randomly or by sensing. ### Claim 11 (depends on 10) The method of claim 10, wherein the first message is carried in uplink control information, a Media Access Control Control Element (MAC CE), or a Radio Resource Control (RRC) signaling. ### Claim 12 (depends on 10) The method of claim 10, wherein the first configuration information comprises at least one piece of following pieces of information: the identification information of the second terminal device which performs unicast communication with the first terminal device. ### Claim 13 (depends on 10) The method of claim 10, wherein the first configuration information is carried in broadcast information, or RRC signaling. ### Claim 14 A terminal device, comprising: a processor and a transceiver, wherein the transceiver is configured to send a first message to a network device, wherein the first message comprises group identifier information of a terminal device group where the terminal device is located, or identification information of a second terminal device, wherein the second terminal device is a terminal device which performs unicast communication with the first terminal device, and receive first configuration information sent by the network device, wherein the first configuration information is used for indicating a first transmission mode; and the processor is configured to determine the first transmission mode in a plurality of transmission modes based on the first configuration information; wherein the transceiver is further configured to adopt the first transmission mode to perform a sidelink communication with another terminal device, wherein the first configuration information comprises: type information of unicast communication, multicast communication or broadcast communication, Quality of Service (QoS) attribute information, and the group identification information of the terminal device group where the first terminal is located, wherein the transmission mode comprises: mode 1 or mode 2, wherein the mode 1 is that the network device allocates transmission resources for the first terminal device, and the mode 2 is that the terminal device selects the transmission resources randomly or by sensing. ### Claim 15 (depends on 14) The terminal device of claim 14, wherein if the terminal device is not a group head in the terminal device group, group head information comprises identification information of the group head in the terminal device group; or if the terminal device is the group head in the terminal device group, the group head information is used for indicating that the terminal device is the group head in the terminal device group. ### Claim 16 (depends on 14) The terminal device of claim 14, wherein if the second terminal device is located outside a cell coverage area, first indication information is used for indicating that the second terminal device is located outside the cell coverage area; or if the second terminal device is located within the cell coverage area, the first indication information comprises cell identification information of a cell where the second terminal device is located; or if the second terminal device is located outside a coverage area of a cell where the terminal device is located, the first indication information is used for indicating that the second terminal device is located outside the coverage area of the cell where the terminal device is located and/or the first indication information comprises the cell identification information of the cell where the second terminal device is located; or if the second terminal device is located within the coverage area of the cell where the terminal device is located, the first indication information is used for indicating that the second terminal device is located in the cell where the terminal device is located. ### Claim 17 (depends on 16) The terminal device of claim 16, wherein the transceiver is further configured to: receive second information sent by the second terminal device. ### Claim 18 (depends on 17) The terminal device of claim 17, wherein the second information is carried in a sidelink transmission channel, and the sidelink transmission channel is a Physical Sidelink Control Channel (PSCCH) or a Physical Sidelink Shared Channel (PSSCH). ### Claim 19 (depends on 14) The terminal device of claim 14, wherein the transceiver is further configured to: send second configuration information to the second terminal device, wherein the second configuration information is used for indicating the second terminal device to adopt the first transmission mode to perform the sidelink communication. ### Claim 20 (depends on 14) The terminal device of claim 14, wherein the first message is carried in uplink control information, a Media Access Control Control Element (MAC CE), or a Radio Resource Control (RRC) signaling. ### Claim 21 (depends on 14) The terminal device of claim 14, wherein the first configuration information further comprises at least one piece of following information: the identification information of the second terminal device which performs unicast communication with the first terminal device. ### Claim 22 (depends on 14) The terminal device of claim 14, wherein the first configuration information is carried in broadcast information, or RRC signaling. ### Claim 23 A network device, comprising: a processor and a transceiver, wherein the transceiver is configured to receive a first message sent by a first terminal device, wherein the first message comprises group identifier information of a terminal device group where the first terminal device is located, or identification information of a second terminal device, wherein the second terminal device is a terminal device which performs unicast communication with the first terminal device; and the processor is configured to determine a first transmission mode in a plurality of transmission modes according to the first message; wherein the transceiver is configured to send first configuration information to the first terminal device, wherein the first configuration information is used for indicating the first terminal device to adopt the first transmission mode to perform a sidelink communication with another terminal device, wherein the first configuration information comprises: type information of unicast communication, multicast communication or broadcast communication, Quality of Service (QoS) attribute information, and the group identification information of the terminal device group where the first terminal is located, wherein the transmission mode comprises: mode 1 or mode 2, wherein the mode 1 is that the network device allocates transmission resources for the first terminal device, and the mode 2 is that the terminal device selects the transmission resources randomly or by sensing. ### Claim 24 (depends on 23) The network device of claim 23, wherein the first message is carried in uplink control information, a Media Access Control Control Element (MAC CE), or a Radio Resource Control (RRC) signaling. ### Claim 25 (depends on 23) The network device of claim 23, wherein the first configuration information further comprises the identification information of the second terminal device which performs unicast communication with the first terminal device. ### Claim 26 (depends on 23) The network device of claim 23, wherein the first configuration information is carried in broadcast information, or RRC signaling.