# US 12,192,856 B2 · Link adaptation for sidelink groupcast > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,192,856 B2 - Document ID: US12192856B2 - Status: Granted - Kind: B2 - Application number: 17/421,496 - Filed: 2019-12-18 - Published: 2022-03-17 - Granted: 2025-01-07 - Earliest claimed: 2019-01-10 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget LM Ericsson (publ) - Inventors: Shehzad Ali Ashraf; Wanlu Sun; Hieu Do - Web page: https://patentgrep.com/patent/US12192856B2 ## CPC - H04L 1/0015: {characterised by the adaptation strategy} - H04W 4/06: Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services - H04L 1/0003: {by switching between different modulation schemes} - H04L 1/0009: {by adapting the channel coding (H04L1/1812 takes precedence)} - H04L 1/1692: {Physical properties of the supervisory signal, e.g. acknowledgement by energy bursts} - H04L 1/1861: {Physical mapping arrangements (for ACK signaling see also H04L5/0053)} - H04W 4/40: for vehicles, e.g. vehicle-to-pedestrians [V2P] - H04W 4/44: for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H] - H04W 4/46: for vehicle-to-vehicle communication [V2V] - H04W 76/14: Direct-mode setup - H04W 76/40: for selective distribution or broadcast - H04L 2001/0093: {Point-to-multipoint} - H04W 4/02: Services making use of location information - H04W 4/70: Services for machine-to-machine communication [M2M] or machine type communication [MTC] - H04W 4/80: Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication - H04W 76/23: Manipulation of direct-mode connections - 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 Methods, computer programs and receiving wireless devices for operating a receiving wireless device associated with a group are provided, wherein the group includes the receiving wireless device and a transmitting wireless device. The method includes receiving a groupcast data packet from the transmitting wireless device of the group. The method further includes determining a distance of the receiving wireless device from the transmitting wireless device. The method further includes selecting a communication resource for one of an Acknowledgement, ACK, message or Negative Acknowledgement, NACK, message for the groupcast data packet, wherein the communication resource is selected based on the distance from the transmitting wireless device. The method further includes transmitting the one of the ACK message or NACK message for the groupcast data packet using the communication resource selected based on the distance from the transmitting wireless device. ## Claims ### Claim 1 A method of operating a transmitting wireless device associated with a group, wherein the group includes the transmitting wireless device and a plurality of other wireless devices, the method comprising: transmitting a groupcast data packet to the plurality of other wireless devices of the group; determining a power/energy of at least one Hybrid Automatic Repeat Request (HARQ) feedback message received in response to the groupcast data packet, wherein respective positive acknowledgment (ACK) and negative acknowledgment (NACK) communication resources are provided for HARQ feedback of the groupcast data packet, and determining the power/energy comprises determining a combined power/energy received from some of the plurality of other wireless devices of the group over the ACK communication resource for the groupcast data packet and determining a combined power/energy received from other of the plurality of other wireless devices of the group over the NACK communication resource for the groupcast data packet; and adjusting a transmission comprising performing the transmission using a modulation and coding scheme (MCS) and adjusting the MCS based on the power/energy of the at least one HARQ feedback message. ### Claim 2 (depends on 1) The method of claim 1, wherein adjusting the transmission comprises performing the transmission using a transmission power determined based on the power/energy of the at least one HARQ feedback message. ### Claim 3 (depends on 1) The method of claim 1 wherein adjusting the transmission comprises performing the transmission using the MCS determined based on the power/energy of the at least one HARQ feedback message and on a channel busy ratio (CBR) and/or transmission requirements, and/or using a transmission power determined based on the power/energy of the at least one HARQ feedback message and on the CBR and/or transmission requirements. ### Claim 4 (depends on 1) The method of claim 1, wherein the groupcast data packet is a first groupcast data packet, wherein adjusting the transmission comprises adjusting the MCS by determining a reduced MCS and/or increased power responsive to a ratio or difference between the combined power/energy received over the ACK communication resource and the combined power/energy received over the NACK communication resource being less than a threshold, the method further comprising: transmitting a second groupcast data packet to the plurality of other wireless devices of the group using the reduced MCS and/or increased power responsive to the ratio or difference being less than the threshold. ### Claim 5 (depends on 1) The method of claim 1, wherein the groupcast data packet is a first groupcast data packet, wherein adjusting the transmission comprises adjusting the MCS by determining an increased MCS and/or reduced power responsive to a ratio or difference between the combined power/energy received over the ACK communication resource and the combined power/energy received over the NACK communication resource being greater than a threshold, the method further comprising: transmitting a second groupcast data packet to the plurality of other wireless devices of the group using the increased MCS and/or reduced power responsive to the ratio or difference being greater than the threshold. ### Claim 6 (depends on 1) The method of claim 1, wherein a plurality of ACK communication resources and a plurality of NACK communication resources are provided for the groupcast data packet, wherein determining the combined power/energy received over the ACK communication resource comprises determining a combined power/energy received over the plurality of ACK communication resources for the groupcast data packet, and wherein determining the combined power/energy received over the NACK communication resource comprises determining a combined power/energy received over the plurality of ACK communication resources for the groupcast data packet. ### Claim 7 (depends on 1) The method of claim 1, wherein a plurality of ranges of distances from the transmitting wireless device are associated with respective pluralities of positive acknowledgment (ACK) and negative acknowledgment (NACK) communication resources for the groupcast data packet. ### Claim 8 (depends on 7) The method of claim 7, further comprising providing information used to define the plurality of ranges of distances and the pluralities of ACK and NACK communication resources to the plurality of other wireless devices of the group using control information. ### Claim 9 (depends on 8) The method of claim 8, wherein the information used to define the plurality of ranges of distances and the pluralities of ACK and NACK communication resources are configured at the transmitting wireless device based on information received from a wireless communication network. ### Claim 10 (depends on 8) The method of claim 8, wherein the control information is transmitted or received using at least one of Sidelink Control Information (SCI), a Medium Access Control Element (MAC CE), and/or Radio Resource Control (RRC) information. ### Claim 11 (depends on 1) The method of claim 1, configuring the groupcast data packet to include a destination group identifier for the other wireless devices of the group in proximity to the transmitting wireless device. ### Claim 12 A transmitting wireless device comprising: a processor; and memory coupled with the processor, wherein the memory includes instructions that when executed by the processor causes the transmitting wireless device to perform operations comprising: transmitting a groupcast data packet to the plurality of other wireless devices of the group; determining a power/energy of at least one Hybrid Automatic Repeat Request (HARQ) feedback message received in response to the groupcast data packet, wherein respective positive acknowledgment (ACK) and negative acknowledgment (NACK) communication resources are provided for HARQ feedback of the groupcast data packet, wherein determining the power/energy comprises determining a combined power/energy received over the ACK communication resource for the groupcast data packet and determining a combined power/energy received over the NACK communication resource for the groupcast data packet; and adjusting a transmission comprising performing the transmission using a modulation and coding scheme (MCS) and adjusting the MCS based on the power/energy of the at least one HARQ feedback message. ### Claim 13 (depends on 12) The transmitting wireless device of claim 12, wherein adjusting the transmission comprises performing the transmission using the MCS determined based on the power/energy of the at least one HARQ feedback message, and/or using a transmission power determined based on the power/energy of the at least one HARQ feedback message. ### Claim 14 (depends on 12) The transmitting wireless device of claim 12 wherein adjusting the transmission comprises performing the transmission using the MCS determined based on the power/energy of the at least one HARQ feedback message and on a channel busy ratio (CBR) and/or transmission requirements, and/or using a transmission power determined based on the power/energy of the at least one HARQ feedback message and on the CBR and/or transmission requirements. ### Claim 15 (depends on 12) The transmitting wireless device of claim 12, wherein the groupcast data packet is a first groupcast data packet, wherein adjusting the transmission comprises adjusting the MCS by determining a reduced MCS and/or increased power responsive to a ratio or difference between the combined power/energy received over the ACK communication resource and the combined power/energy received over the NACK communication resource being less than a threshold, wherein the memory includes instructions that when executed by the processor causes the transmitting wireless device to perform operations further comprising: transmitting a second groupcast data packet to the plurality of other wireless devices of the group using the reduced MCS and/or increased power responsive to the ratio or difference being less than the threshold. ### Claim 16 (depends on 12) The transmitting wireless device of claim 12, wherein the groupcast data packet is a first groupcast data packet, wherein adjusting the transmission comprises adjusting the MCS by determining an increased MCS and/or reduced power responsive to a ratio or difference between the combined power/energy received over the ACK communication resource and the combined power/energy received over the NACK communication resource being greater than a threshold, wherein the memory includes instructions that when executed by the processor causes the transmitting wireless device to perform operations further comprising: transmitting a second groupcast data packet to the plurality of other wireless devices of the group using the increased MCS and/or reduced power responsive to the ratio or difference being greater than the threshold. ### Claim 17 (depends on 12) The transmitting wireless device of claim 12, wherein a plurality of ranges of distances are associated with respective pluralities of positive acknowledgment (ACK) and negative acknowledgment (NACK) communication resources for the groupcast data packet. ### Claim 18 (depends on 17) The transmitting wireless device of claim 17, further comprising providing information used to define the plurality of ranges of distances and the pluralities of ACK and NACK communication resources to the plurality of other wireless devices of the group using control information. ### Claim 19 (depends on 12) The transmitting wireless device of claim 12, wherein a plurality of ACK communication resources and a plurality of NACK communication resources are provided for the groupcast data packet, wherein determining the combined power/energy received over the ACK communication resource comprises determining a combined power/energy received over the plurality of ACK communication resources for the groupcast data packet, and wherein determining the combined power/energy received over the NACK communication resource comprises determining a combined power/energy received over the plurality of ACK communication resources for the groupcast data packet. ### Claim 20 A computer program comprising a non-transitory storage medium including program code to be executed by at least one processor of a transmitting wireless device, whereby execution of the program code causes the transmitting wireless device to perform operations comprising: transmitting a groupcast data packet to the plurality of other wireless devices of the group; determining a power/energy of at least one Hybrid Automatic Repeat Request (HARQ) feedback message received in response to the groupcast data packet, wherein respective positive acknowledgment (ACK) and negative acknowledgment (NACK) communication resources are provided for HARQ feedback of the groupcast data packet, wherein determining the power/energy comprises determining a combined power/energy received over the ACK communication resource for the groupcast data packet and determining a combined power/energy received over the NACK communication resource for the groupcast data packet; and adjusting a transmission comprising performing the transmission using a modulation and coding scheme (MCS) and adjusting the MCS based on the power/energy of the at least one HARQ feedback message.