# US 12,119,945 B2 · Hybrid automatic repeat request feedback for wireless communication > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,119,945 B2 - Document ID: US12119945B2 - Status: Granted - Kind: B2 - Application number: 17/262,433 - Filed: 2019-09-12 - Published: 2021-09-23 - Granted: 2024-10-15 - Earliest claimed: 2018-09-13 - Assignees: Apple Inc. - Applicants: Apple Inc. - Inventors: Honglei Miao - Web page: https://patentgrep.com/patent/US12119945B2 ## CPC - H04L 1/1861: {Physical mapping arrangements (for ACK signaling see also H04L5/0053)} - H04L 1/1896: {ARQ related signaling} - H04B 7/063: {Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection} - H04L 1/1671: {the supervisory signal being transmitted together with control information} - H04L 1/1819: {with retransmission of additional or different redundancy} - H04L 1/1858: {Transmission or retransmission of more than one copy of acknowledgement message} - H04L 1/189: {Transmission or retransmission of more than one copy of a message} - H04L 5/0023: {Time-frequency-space} - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04L 65/1059: End-user terminal functionalities specially adapted for real-time communication - H04W 72/20: Control channels or signalling for resource management - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 27/261: {Details of reference signals} - H04W 4/10: Push-to-Talk [PTT] or Push-On-Call services - 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 4/70: Services for machine-to-machine communication [M2M] or machine type communication [MTC] - H04W 92/18: between terminal devices - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION - 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 includes methods and devices for NACK feedback based HARQ retransmission scheme in a wireless communication network. The method includes receiving mobile radio communication terminal devices transmitting NACK feedback signaled time-frequency resources and transmitting mobile radio communication terminal devices performing retransmission of the previously sent messages based on receiving NACK feedback. ## Claims ### Claim 1 A mobile radio communication terminal device, comprising: at least one receiver; at least one transmitter; and one or more processors operatively coupled to a non-transitory memory that stores computer readable software, wherein the computer readable software, when executed by the one or more processors, causes the mobile radio communication terminal device to: transmit, via the at least one transmitter, to at least a second mobile radio communication terminal device: a sidelink control information (SCI) that includes first information; and a physical sidelink shared channel (PSSCH) transport block; receive, via the at least one receiver, either a negative-acknowledgment (NACK) feedback message from the second mobile radio communication terminal device or no response, wherein: when the NACK feedback message is received, it indicates the PSSCH transport block was not successfully decoded, and when no response is received, an acknowledgement (ACK) for the PSSCH transport block is indicated; wherein a resource block and cyclic shift of a sequence for the NACK feedback message are determinable based on the first information included in the SCI; and determine whether or not to perform a retransmission of the PSSCH transport block based on receiving the NACK feedback message or no response. ### Claim 2 (depends on 1) The mobile radio communication terminal device of claim 1, wherein said determining whether or not to perform a retransmission of the PSSCH transport block comprises: determining a number of retransmissions of the PSSCH transport block by the mobile radio communication terminal device is less than a threshold; and determining to perform a retransmission of the PSSCH transport block based on said determination that the number of retransmissions is less than the threshold. ### Claim 3 (depends on 2) The mobile radio communication terminal device of claim 2, wherein the computer readable software causes the mobile radio communication terminal to determine not to perform a retransmission of the PSSCH transport block by determining whether the current number of retransmissions of the PSSCH transport block is equal to the threshold. ### Claim 4 (depends on 1) The mobile radio communication terminal device of claim 1, wherein the computer readable software causes the mobile radio communication terminal device to receive a subsequent NACK message after performing a retransmission of the PSSCH transport block. ### Claim 5 (depends on 1) The mobile radio communication terminal device of claim 1, wherein the SCI message includes NACK feedback resource allocation information. ### Claim 6 (depends on 5) The mobile radio communication terminal device of claim 5, wherein the computer readable software causes the mobile radio communication terminal device to transmit, at one or more times, a plurality of beam-specific reference signals. ### Claim 7 (depends on 6) The mobile radio communication terminal device of claim 6, wherein the computer readable software causes the mobile radio communication terminal device to receive a NACK feedback message from a selected NACK resource from one of a plurality of NACK resource allocations, wherein the selected NACK resource is to indicate one of the plurality of beam-specific reference signals. ### Claim 8 (depends on 7) The mobile radio communication terminal device of claim 7, wherein the computer readable software causes the mobile radio communication terminal device to perform a retransmission of the PSSCH transport block in a beam direction of the beam-specific reference signal associated with the selected NACK resource used for the NACK feedback message. ### Claim 9 (depends on 5) The mobile radio communication terminal device of claim 5, wherein the NACK feedback message includes a selected NACK sequence from a plurality NACK sequences, the selected NACK sequence indicating a beam direction for retransmission of the PSSCH transport block. ### Claim 10 (depends on 9) The mobile radio communication terminal device of claim 9, wherein the computer readable software causes the mobile radio communication terminal device to perform a retransmission of the PSSCH transport block in the beam direction. ### Claim 11 A mobile radio communication terminal device comprising: at least one receiver; at least one transmitter; and one or more processors operatively coupled to a non-transitory memory that stores computer readable software, wherein the computer readable software, when executed by the one or more processors, causes the mobile radio communication terminal device to: receive, via the at least one receiver, a transmitted physical signal shared channel (PSSCH) transport block from a second mobile radio communication terminal device; implement a decoding process on the received PSSCH transport block; in response to the mobile radio communication terminal device not successfully decoding the PSSCH transport block, transmit, via the at least one transmitter, a negative-acknowledgment (NACK) feedback message to the second mobile radio communication terminal device; and in response to the mobile radio communication terminal device successfully decoding the PSCCH transport block: not transmit an acknowledgement (ACK) feedback message to the second mobile radio communication terminal device; and ignore any subsequent received retransmission of the PSSCH transport block. ### Claim 12 (depends on 11) The mobile radio communication terminal device of claim 11, wherein the computer readable software causes the mobile radio communication terminal device to: receive a retransmission of the PSSCH transport block after sending the NACK message. ### Claim 13 (depends on 11) The mobile radio communication terminal device of claim 11, wherein the computer readable software causes the mobile radio communication terminal device to receive, a sidelink control information (SCI) message. ### Claim 14 (depends on 13) The mobile radio communication terminal device of claim 13, wherein the SCI message includes NACK feedback resource allocation information. ### Claim 15 (depends on 14) The mobile radio communication terminal device of claim 14, wherein the computer readable software causes the mobile radio communication terminal device to receive, at one or more times, a plurality of beam-specific reference signals. ### Claim 16 (depends on 15) The mobile radio communication terminal device of claim 15, wherein the computer readable software causes the mobile radio communication terminal device to select a NACK resource from a plurality of NACK resource allocations indicated in the NACK feedback resource allocation information of the SCI message and transmit the NACK feedback message using the selected NACK resource wherein the selected NACK resource indicates one of a plurality of the beam-specific reference signals for retransmission of the PSSCH transport block. ### Claim 17 A method comprising: provide for transmission to a remote mobile radio communication terminal device: a sidelink control information (SCI) that includes first information; and a physical sidelink shared channel (PSSCH) transport block; receive either a negative-acknowledgment (NACK) feedback message from the remote mobile radio communication terminal device or no response, wherein: when the NACK feedback message is received, it indicates the PSSCH transport block was not successfully decoded, and when no response is received, and acknowledgement (ACK) for the PSSCH transport block is indicated; wherein a resource block and cyclic shift of a sequence for the NACK feedback message are determinable based on the first information included in the SCI; and determine whether or not to perform a retransmission of the PSSCH transport block based on receiving the NACK feedback message or no response. ### Claim 18 (depends on 1) The mobile radio communication terminal device of claim 1, further comprising: perform a retransmission, via the at least one receiver, of the PSSCH transport block if the mobile radio communication terminal device determines to perform a retransmission the PSSCH transport block, and not perform a retransmission the PSSCH transport block if the mobile radio communication terminal device determines not to perform a retransmission the PSSCH transport block.