# US 11,451,343 B2 · Message re-transmission in a group of devices > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,451,343 B2 - Document ID: US11451343B2 - Status: Granted - Kind: B2 - Application number: 16/680,036 - Filed: 2019-11-11 - Published: 2020-05-14 - Granted: 2022-09-20 - Earliest claimed: 2018-11-13 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Hong Cheng; Tien Viet Nguyen; Sudhir Kumar Baghel; Kapil Gulati; Junyi Li; Zhibin Wu - Web page: https://patentgrep.com/patent/US11451343B2 ## CPC - H04L 1/1819: {with retransmission of additional or different redundancy} - H04L 1/1896: {ARQ related signaling} - H04L 1/1845: {Combining techniques, e.g. code combining} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04W 4/40: for vehicles, e.g. vehicle-to-pedestrians [V2P] - H04W 4/70: Services for machine-to-machine communication [M2M] or machine type communication [MTC] - H04W 28/0268: {using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR] (negotiating SLA or negotiating QoS H04W28/24)} - H04L 2001/0097: {Relays} - 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 A device receives a coded message from a re-transmitting device designated by one or more devices for performing message re-transmission on their behalf. The coded message encodes a first message and a second message, where the receiving device has failed to receive at least the second message. The receiving device further receives a coding-based re-transmission indicator indicating that the coded message is configured as a coding-based re-transmission of two or more previously transmitted messages that are encoded together in the coded message. The receiving device recovers the second message by decoding the coded message. In another aspect, a re-transmitting device is designated by one or more devices for performing message re-transmission on behalf of the devices. The device generates a coded message that encodes a first and a second message; and transmits the coded message and an indicator indicating that the coded message is a coding-based re-transmission. ## Claims ### Claim 1 A method of wireless communication at a receiving device, comprising: receiving, from a re-transmitting device, a coded message that encodes at least a first message and a second message, wherein the receiving device has failed to receive at least the second message, wherein the first message and the second message are received by the re-transmitting device from one or more devices and are encoded in the coded message by the re-transmitting device responsive to receiving a first and a second re-transmission configuration indicator from the one or more devices, wherein the first re-transmission configuration indicator indicates that the re-transmitting device is designated by the one or more devices for a coding-based re-transmission of the first message on behalf of the one or more devices, wherein the second re-transmission configuration indicator indicates that the re-transmitting device is designated by the one or more devices for a coding-based re-transmission of the second message on behalf of the one or more devices; receiving, from the re-transmitting device, a coding-based re-transmission indicator indicating that the coded message is configured as a coding-based re-transmission of two or more previously transmitted messages that are encoded together in the coded message; and recovering, in response to receiving the coding-based re-transmission indicator, at least the second message by decoding the coded message. ### Claim 2 (depends on 1) The method of claim 1, wherein only the re-transmitting device is authorized to re-transmit at least the first message and the second message. ### Claim 3 (depends on 1) The method of claim 1, further comprising: receiving the first message from a first device; receiving the first re-transmission configuration indicator indicating that the first message is subject to the coding-based re-transmission; caching the first message at the receiving device in response to receiving the first re-transmission configuration indicator; and wherein the recovering of at least the second message includes using at least the first message for decoding the coded message. ### Claim 4 (depends on 3) The method of claim 3, wherein the caching comprises caching the first message for a duration of a re-transmission time window, wherein the coding-based re-transmission is applied only to recent messages received within the re-transmission time window. ### Claim 5 (depends on 1) The method of claim 1, further comprising: receiving a coding type indicator indicating a coding type used to generate the coded message; and wherein the recovering of at least the second message comprises decoding the coded message based at least on the coding type. ### Claim 6 (depends on 1) The method of claim 1, further comprising: receiving message identifiers (IDs) of the first message and the second message; and wherein the recovering of at least the second message comprises recovering the second message based at least on the message IDs of the first message and the second message. ### Claim 7 (depends on 1) The method of claim 1, wherein receiving the coded message comprises receiving over a device-to-device (D2D) communication link in a vehicle-to-everything (V2X) communication. ### Claim 8 (depends on 7) The method of claim 7, wherein the re-transmitting device is a relay or a road side unit (RSU). ### Claim 9 (depends on 7) The method of claim 7, wherein the receiving device is part of a platoon including a first device that transmitted the first message, a second device that transmitted the second message, and the re-transmitting device, wherein the re-transmitting device is a platoon leader. ### Claim 10 (depends on 1) The method of claim 1, wherein receiving the coded message comprises receiving over a UE-to-Universal Mobile Telecommunications System (UMTS) link (Uu link) in an Integrated Access and Backhaul (IAB) downlink communication in a radio access network (RAN). ### Claim 11 (depends on 10) The method of claim 10, wherein receiving the coded message comprises receiving from a relay designated by one or more IAB nodes for performing at least one message re-transmission on behalf of the one or more IAB nodes. ### Claim 12 (depends on 1) The method of claim 1, further comprising: receiving the first message; determining that the second message is not received by the receiving device; transmitting a negative acknowledgement (NACK) indicating that the second message is not received by the receiving device; and wherein the recovering of at least the second message comprises using the first message to decode the coded message, wherein the coded message encodes the second message with the first message at least in response to the first message being received by the receiving device. ### Claim 13 A method of wireless communication at a re-transmitting device, comprising: receiving a first message and a second message transmitted by one or more devices; receiving a first re-transmission configuration indicator indicating that the re-transmitting device is designated by the one or more devices for a coding-based re-transmission of the first message on behalf of the one or more devices; receiving a second re-transmission configuration indicator indicating that the re-transmitting device is designated by the one or more devices for a coding-based re-transmission of the second message on behalf of the one or more devices; generating, responsive to receiving the first re-transmission configuration indicator and the second re-transmission configuration indicator, a coded message that encodes at least the first message and the second message; transmitting the coded message; and transmitting a coding-based re-transmission indicator indicating that the coded message is configured as a coding-based re-transmission of two or more previously transmitted messages that are encoded together in the coded message. ### Claim 14 (depends on 13) The method of claim 13, wherein the coded message and the coding-based re-transmission indicator are configured to enable a receiving device to recover at least one of the first message or the second message by decoding the coded message. ### Claim 15 (depends on 13) The method of claim 13, wherein the first re-transmission configuration indicator indicates that the first message is subject to the coding-based re-transmission of the first message; and wherein the second re-transmission configuration indicator indicates that the second message is subject to the coding-based re-transmission of the second message. ### Claim 16 (depends on 15) The method of claim 15, further comprising: transmitting a coding-based re-transmission capability indicator indicating that the re-transmitting device is capable of performing coding-based re-transmission; and wherein the receiving of the first re-transmission configuration indicator and the second re-transmission configuration indicator comprises receiving the first re-transmission configuration indicator and the second re-transmission configuration indicator at least in response to the transmitting of the coding-based re-transmission capability indicator. ### Claim 17 (depends on 15) The method of claim 15, wherein only the re-transmitting device is authorized to re-transmit the first message and the second message. ### Claim 18 (depends on 13) The method of claim 13, further comprising: transmitting a coding type indicator indicating a coding type used to generate the coded message, wherein the coded message, the coding-based re-transmission indicator, and the coding type indicator are configured to enable a receiving device to recover at least one of the first message or the second message by decoding the coded message based on the coding type. ### Claim 19 (depends on 13) The method of claim 13, further comprising: transmitting message identifiers (IDs) of the first message and the second message, wherein the coded message, the coding-based re-transmission indicator, and the message IDs are configured to enable a receiving device to recover at least one of the first message or the second message by decoding the coded message. ### Claim 20 (depends on 13) The method of claim 13, wherein the first re-transmission configuration indicator is received from a first device that transmitted the first message, the first re-transmission configuration indicator indicating that the re-transmitting device is selected for the coding-based re-transmission of the first message; and wherein the second re-transmission configuration indicator is received from a second device that transmitted the second message, the second re-transmission configuration indicator indicating that the re-transmitting device is selected for the coding-based re-transmission of the second message. ### Claim 21 (depends on 13) The method of claim 13, wherein the first re-transmission configuration indicator is received from a first device that transmitted the first message, the first re-transmission configuration indicator indicating a first quality of service (QoS) requirement configured to trigger the coding-based re-transmission of the first message; and wherein the second re-transmission configuration indicator is received from a second device that transmitted the second message, the second re-transmission configuration indicator indicating a second QoS requirement configured to trigger the coding-based re-transmission of the second message. ### Claim 22 (depends on 13) The method of claim 13, wherein the first re-transmission configuration indicator is received from a first device that transmitted the first message, the first re-transmission configuration indicator indicating a coding type to use for the coding-based re-transmission of the first message; and wherein the second re-transmission configuration indicator is received from a second device that transmitted the second message, the second re-transmission configuration indicator indicating the coding type to use for the coding-based re-transmission of the second message. ### Claim 23 (depends on 13) The method of claim 13, further comprising: receiving a first negative acknowledgement (NACK) indicating that the second message is not received by a receiving device; and wherein the generating further comprises encoding the second message with the first message only if a second NACK corresponding to the first message is not received. ### Claim 24 (depends on 13) The method of claim 13, wherein the first re-transmission configuration indicator indicates at least one of: that the first message is subject to the coding-based re-transmission of the first message, that the re-transmitting device is selected for the coding-based re-transmission of the first message, a first quality of service (QoS) requirement configured to trigger the coding-based re-transmission of the first message, and a coding type to use for the coding-based re-transmission of the second message; and wherein the second re-transmission configuration indicator indicating at least one of: that the second message is subject to the coding-based re-transmission of the second message, that the re-transmitting device is selected for the coding-based re-transmission of the second message, a second quality of service (QoS) requirement configured to trigger the coding-based re-transmission of the second message, and the coding type to use for the coding-based re-transmission of the second message. ### Claim 25 (depends on 13) The method of claim 13, wherein transmitting the coded message comprises transmitting over a device-to-device (D2D) communication link in a vehicle-to-everything (V2X) communication. ### Claim 26 (depends on 25) The method of claim 25, wherein the re-transmitting device is a relay, a road side unit (RSU), or a platoon leader of a platoon including a first device that transmitted the first message, a second device that transmitted the second message, and the re-transmitting device. ### Claim 27 (depends on 13) The method of claim 13, wherein transmitting the coded message comprises transmitting over a UE-to-Universal Mobile Telecommunications System (UMTS) link (Uu link) in an Integrated Access and Backhaul (IAB) downlink communication in a radio access network (RAN). ### Claim 28 (depends on 27) The method of claim 27, wherein the re-transmitting device comprises a relay, wherein determining that the relay is designated by the one or more devices comprises determining that the relay is designated by one or more IAB nodes for performing at least one message re-transmission on behalf of the one or more IAB nodes. ### Claim 29 A receiving device for wireless communication, comprising: a memory storing instructions; and a processor in communication with the memory, wherein the processor is configured to: receive, from a re-transmitting device, a coded message that encodes at least a first message and a second message, wherein the receiving device has failed to receive at least the second message, wherein the first message and the second message are received by the re-transmitting device from one or more devices and are encoded in the coded message by the re-transmitting device responsive to receiving a first and a second re-transmission configuration indicator from the one or more devices, wherein the first re-transmission configuration indicator indicates that the re-transmitting device is designated by the one or more devices for a coding-based re-transmission of the first message on behalf of the one or more devices, wherein the second re-transmission configuration indicator indicates that the re-transmitting device is designated by the one or more devices for a coding-based re-transmission of the second message on behalf of the one or more devices; receive, from the re-transmitting device, a coding-based re-transmission indicator indicating that the coded message is configured as a coding-based re-transmission of two or more previously transmitted messages that are encoded together in the coded message; and recover, in response to receiving the coding-based re-transmission indicator, at least the second message by decoding the coded message. ### Claim 30 A re-transmitting device for wireless communication, comprising: a memory storing instructions; and a processor in communication with the memory, wherein the processor is configured to: receive a first message and a second message transmitted by one or more devices; receiving a first re-transmission configuration indicator indicating that the re-transmitting device is designated by the one or more devices for a coding-based re-transmission of the first message on behalf of the one or more devices; receive a second re-transmission configuration indicator indicating that the re-transmitting device is designated by the one or more devices for a coding-based re-transmission of the second message on behalf of the one or more devices; generate, responsive to receiving the first re-transmission configuration indicator and the second re-transmission configuration indicator, a coded message that encodes at least the first message and the second message; transmit the coded message; and transmit a coding-based re-transmission indicator indicating that the coded message is configured as a coding-based re-transmission of two or more previously transmitted messages that are encoded together in the coded message.