# US 12,015,490 B2 · Hybrid automatic repeat request feedback indication and feedback method, device, and base station > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,015,490 B2 - Document ID: US12015490B2 - Status: Granted - Kind: B2 - Application number: 17/822,875 - Filed: 2022-08-29 - Published: 2022-12-29 - Granted: 2024-06-18 - Earliest claimed: 2022-08-29 - Assignees: Beijing Xiaomi Mobile Software Co., Ltd. - Applicants: Beijing Xiaomi Mobile Software Co., Ltd. - Inventors: Yajun Zhu - Web page: https://patentgrep.com/patent/US12015490B2 ## CPC - H04L 1/1819: {with retransmission of additional or different redundancy} - H04L 1/1896: {ARQ related signaling} - H04L 1/1854: {Scheduling and prioritising arrangements} - H04L 5/00: Arrangements affording multiple use of the transmission path - H04W 8/24: Transfer of terminal data - H04W 72/04: Wireless resource allocation - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 76/27: Transitions between radio resource control [RRC] states - H04W 80/02: Data link layer protocols - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - 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 method for Hybrid Automatic Repeat reQuest (HARQ) feedback indication includes: determining to send current downlink data to a terminal; generating uplink HARQ feedback indication information for the current downlink data, wherein a timing relationship between a time domain unit of downlink data for the terminal and a time domain unit of an uplink HARQ feedback of the downlink data includes a set of first timing relationships and a set of second timing relationships, and the set of first timing relationships is a subset of the set of second timing relationships; and sending to the terminal the current downlink data and downlink control information (DCI) carrying the uplink HARQ feedback indication information. A terminal to realize dynamic HARQ feedback can be realized by a terminal. ## Claims ### Claim 1 A method for Hybrid Automatic Repeat reQuest (HARQ) feedback indication, performed by a base station and comprising: predefining a set of second timing relationships between time-domain units where downlink data supported by a present system are located and time-domain units for uplink HARQ feedback of the downlink data; determining present downlink data to be sent to User Equipment (UE); generating uplink HARQ feedback indication information for the present downlink data, a timing relationship between time-domain units where downlink data are located and time-domain units for uplink HARQ feedback of the downlink data comprising a set of first timing relationships between time-domain units where downlink data for the UE are located and time-domain units for uplink HARQ feedback of the downlink data for the UE and the predefined set of second timing relationships, the set of first timing relationships being a proper subset of the set of second timing relationships, and a timing relationship indicated by the uplink HARQ feedback indication information being comprised in the set of first timing relationships; and sending the present downlink data and Downlink Control Information (DCI) carrying the uplink HARQ feedback indication information to the UE. ### Claim 2 (depends on 1) The method of claim 1, further comprising: receiving capability information reported by the UE; in response to determining, according to the capability information, that the UE supports dynamic HARQ feedback, generating the set of first timing relationships; and sending the set of first timing relationships to the UE. ### Claim 3 (depends on 1) The method of claim 1, further comprising: receiving capability information reported by the UE; in response to determining, according to the capability information, that the UE supports dynamic HARQ feedback, generating a generation configuration for the set of first timing relationships; and sending, to the UE, the generation configuration for generating, by the UE, the set of first timing relationships according to the generation configuration and the set of second timing relationships. ### Claim 4 (depends on 1) The method of claim 1, wherein the uplink HARQ feedback indication information is carried in an information field of the DCI, and a bit length of the information field is a fixed value or is determined based on a number of timing relationships comprised in the set of first timing relationships. ### Claim 5 (depends on 1) The method of claim 1, wherein in response to the UE does not support dynamic HARQ feedback, the uplink HARQ feedback indication information is a fixed value, the fixed value is a plurality of fixed values in the set of first timing relationships and is preset by a present system or configured by the base station. ### Claim 6 (depends on 1) A communication system comprising a base station configured to perform operations of the method of claim 1, the system further comprising the UE configured to: obtain the set of second timing relationships, which is predefined, between the time-domain units where the downlink data supported by the present system are located and the time-domain units for the uplink HARQ feedback of the downlink data; receive the present downlink data and the DCI carrying the uplink HARQ feedback indication information for the present downlink data from the base station; obtain the uplink HARQ feedback indication information by parsing the DCI received by the UE; acquire the timing relationship between a time-domain unit where the present downlink data is located and a time-domain unit for uplink HARQ feedback of the present downlink data according to the uplink HARQ feedback indication information obtained by the UE and the set of first timing relationships; and send uplink HARQ feedback information for the present downlink data according to the timing relationship acquired by the UE. ### Claim 7 (depends on 6) The communication system of claim 6, wherein: the uplink HARQ feedback indication information is generated for the present downlink data and the present downlink data and the DCI carrying the uplink HARQ feedback indication information are sent to the UE, to enable the UE to acquire the timing relationship between the time-domain unit where the present downlink data is located and the time-domain unit for uplink HARQ feedback of the present downlink data according to the uplink HARQ feedback indication information and the set of first timing relationships, and send the uplink HARQ feedback information for the present downlink data according to the acquired timing relationship, to thereby facilitate the UE implementing dynamic HARQ feedback; and the uplink HARQ feedback indication information is obtained by parsing the received DCI, the timing relationship between the time-domain unit where the present downlink data is located and the time-domain unit for uplink HARQ feedback of the present downlink data is acquired according to the uplink HARQ feedback indication information and the set of first timing relationships, and the uplink HARQ feedback information for the present downlink data is sent according to the acquired timing relationship, such that the dynamic HARQ feedback is implemented. ### Claim 8 A method for Hybrid Automatic Repeat reQuest (HARQ) feedback, performed by User Equipment (UE) and comprising: obtaining a set of second timing relationships, which is predefined, between time-domain units where downlink data supported by a present system are located and time-domain units for uplink HARQ feedback of the downlink data; receiving present downlink data and Downlink Control Information (DCI) carrying uplink HARQ feedback indication information for the present downlink data from a base station, a timing relationship between time-domain units where downlink data are located and time-domain units for uplink HARQ feedback of the downlink data comprising a set of first timing relationships between time-domain units where downlink data for the UE are located and time-domain units for uplink HARQ feedback of the downlink data for the UE and the predefined set of second timing relationships, and the set of first timing relationships being a proper subset of the set of second timing relationships; obtaining the uplink HARQ feedback indication information by parsing the DCI; acquiring a timing relationship between a time-domain unit where the present downlink data is located and a time-domain unit for uplink HARQ feedback of the present downlink data according to the uplink HARQ feedback indication information and the set of first timing relationships, the timing relationship indicated by the uplink HARQ feedback indication information being comprised in the set of first timing relationships; and sending uplink HARQ feedback information for the present downlink data according to the acquired timing relationship. ### Claim 9 (depends on 8) The method of claim 8, further comprising: reporting capability information of the UE to the base station; and receiving and storing the set of first timing relationships which is sent by the base station according to the capability information. ### Claim 10 (depends on 8) The method of claim 8, further comprising: reporting capability information of the UE to the base station; receiving a generation configuration, which is sent by the base station according to the capability information, for the set of first timing relationships; generating the set of first timing relationships according to the generation configuration and the set of second timing relationships; and storing the set of first timing relationships. ### Claim 11 (depends on 8) The method of claim 8, wherein the uplink HARQ feedback indication information is carried in an information field of the DCI, and a bit length of the information field is a fixed value or is determined based on a number of timing relationships comprised in the set of first timing relationships. ### Claim 12 (depends on 8) The method of claim 8, wherein in response to the UE does not support dynamic HARQ feedback, the uplink HARQ feedback indication information is a fixed value, the fixed value is a plurality of fixed values in the set of first timing relationships, the fixed value is preset by a present system or configured by the base station. ### Claim 13 A device for Hybrid Automatic Repeat reQuest (HARQ) feedback, performed by User Equipment (UE) and comprising: a processor; and a memory device configured to store processor-executable instructions, wherein the processor is configured to: obtain a set of second timing relationships, which is predefined, between time-domain units where downlink data supported by a present system are located and time-domain units for uplink HARQ feedback of the downlink data; receive present downlink data and Downlink Control Information (DCI) carrying uplink HARQ feedback indication information for the present downlink data from a base station, a timing relationship between time-domain units where downlink data are located and time-domain units for uplink HARQ feedback of the downlink data comprising a set of first timing relationships between time-domain units where downlink data for the UE are located and time-domain units for uplink HARQ feedback of the downlink data for the UE and the predefined set of second timing relationships, and the set of first timing relationships being a proper subset of the set of second timing relationships; obtain the uplink HARQ feedback indication information by parsing the DCI received by the processor; acquire a timing relationship between a time-domain unit where the present downlink data is located and a time-domain unit for uplink HARQ feedback of the present downlink data according to the uplink HARQ feedback indication information obtained by the processor and the set of first timing relationships, the timing relationship indicated by the uplink HARQ feedback indication information being comprised in the set of first timing relationships; and send uplink HARQ feedback information for the present downlink data according to the timing relationship acquired by the processor. ### Claim 14 (depends on 13) The device of claim 13, wherein the processor is further configured to: report capability information of the UE to the base station; and receive and store the set of first timing relationships which is sent by the base station according to the capability information reported by the processor. ### Claim 15 (depends on 13) The device of claim 13, wherein the processor is further configured to: report capability information of the UE to the base station; and receive a generation configuration, which is sent by the base station according to the capability information reported by the processor, for the set of first timing relationships; generate the set of first timing relationships according to the generation configuration received by the processor and the set of second timing relationships obtained by the processor; and store the set of first timing relationships generated by the processor. ### Claim 16 (depends on 13) The device of claim 13, wherein the uplink HARQ feedback indication information is carried in an information field of the DCI, and a bit length of the information field is a fixed value or is determined based on a number of timing relationships comprised in the set of first timing relationships. ### Claim 17 (depends on 13) The device of claim 13, wherein in response to the UE does not support dynamic HARQ feedback, the uplink HARQ feedback indication information is a fixed value, the fixed value is a plurality of fixed values in the set of first timing relationships and is preset by a present system or configured by the base station.