# US 2019/0173624 A1 · Downlink hybrid automatic repeat request feedback method based on dynamic frame structure, device and terminal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0173624 A1 - Document ID: US20190173624A1 - Status: Published application - Kind: A1 - Application number: 16/321,928 - Filed: 2016-09-28 - Published: 2019-06-06 - Earliest claimed: 2016-08-16 - Assignees: Yulong Computer Telecommunication Scientific (Shenzhen) Co., Ltd. - Applicants: Yulong Computer Telecommunication Scientific (Shenzhen) Co., Ltd. - Inventors: Shi-Xiao LIU; Yan-Tao ZHONG; Xiong-Wei GUO - Web page: https://patentgrep.com/patent/US20190173624A1 ## CPC - H04L 1/1819: {with retransmission of additional or different redundancy} - H04L 1/18: Automatic repetition systems, e.g. Van Duuren systems - H04L 1/1854: {Scheduling and prioritising arrangements} - H04L 1/1893: {Physical mapping arrangements (physical resource mapping in general H04L5/00)} - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04L 5/1469: {using time-sharing} - H04W 16/14: Spectrum sharing arrangements {between different networks} - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/0096: {Indication of changes in allocation} - 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 downlink Hybrid Automatic Repeat Request (HARQ) feedback method is provided, and includes: determining whether a currently used frame structure needs to be reconfigured; determining an uplink subframe for implementing a downlink HARQ feedback corresponds to each downlink subframe according to the currently used frame structure, when no reconfiguration is needed; determining an uplink subframe for implementing the downlink HARQ feedback corresponds to each downlink subframe in a last radio frame before the reconfiguration time point, when the reconfiguration is needed, according to a first frame structure used before a reconfiguration time point and a second frame structure to be used; determining an uplink subframe for implementing the downlink HARQ feedback corresponds to each downlink subframe in a last radio frame before the reconfiguration time point; when receiving downlink data sent by a base station on any downlink subframe, sending a HARQ feedback message for the downlink data. ## Claims ### Claim 1 A downlink Hybrid Automatic Repeat Request (HARQ) feedback method in an unlicensed frequency band based on dynamic frame structure, each frame structure adopted in the unlicensed frequency band comprising uplink subframes and downlink subframes, and each frame structure having a same type of a subframe continuity setting, the downlink HARQ feedback method comprising: determining whether a currently used frame structure in the unlicensed frequency band needs to be reconfigured; determining an uplink subframe for implementing a downlink HARQ feedback corresponding to each downlink subframe according to the currently used frame structure, when the currently used frame structure does not need to be reconfigured; or determining an uplink subframe for implementing the downlink HARQ feedback corresponding to each downlink subframe in a last radio frame before the reconfiguration time point according to a first frame structure used before a reconfiguration time point and a second frame structure to be used, when the currently used frame structure needs to be reconfigured; and sending a HARQ feedback message for the downlink data on the uplink subframe corresponding to the any downlink subframe for implementing the downlink HARQ feedback, when receiving downlink data sent by a base station on any downlink subframe. ### Claim 2 (depends on 1) The downlink HARQ feedback method in the unlicensed frequency band based on dynamic frame structure of claim 1, wherein determining the uplink subframe for implementing the downlink HARQ feedback corresponding to each downlink subframe according to the currently used frame structure comprises: determining the uplink subframe for implementing the downlink HARQ feedback corresponding to each downlink subframe according to the timing sequence of the downlink HARQ feedback corresponding to the currently used frame structure. ### Claim 3 (depends on 1) The downlink HARQ feedback method in the unlicensed frequency band based on dynamic frame structure of claim 1, wherein determining the uplink subframe for implementing the downlink HARQ feedback corresponding to each downlink subframe in the last radio frame before the reconfiguration time point, according to the first frame structure used before the reconfiguration time point and the second frame structure to be used comprises: determining the uplink subframe for implementing the downlink HARQ feedback corresponding to each downlink subframe in the last radio frame before the reconfiguration time point, according to the number of the uplink subframes in the first frame structure and in the second frame structure. ### Claim 4 (depends on 3) The downlink HARQ feedback method in the unlicensed frequency band based on dynamic frame structure of claim 3, further comprising: when the number of the uplink subframe in the first frame structure is less than or equal to the number of the uplink subframe in the second frame structure, determining the uplink subframe for implementing the downlink HARQ feedback corresponding to each downlink subframe in the last radio frame before the reconfiguration time point, according to the timing sequence of the downlink HARQ feedback corresponding to the first frame structure. ### Claim 5 (depends on 3) The downlink HARQ feedback method in the unlicensed frequency band based on dynamic frame structure of claim 3, further comprising: when the number of the uplink subframe in the first frame structure is more than the number of the uplink subframe in the second frame structure, determining the uplink subframe for implementing the downlink HARQ feedback corresponding to each downlink subframe in the last radio frame before the reconfiguration time point, according to the timing sequence of the downlink HARQ feedback corresponding to the second frame structure. ### Claim 6 (depends on 1) The downlink HARQ feedback method in the unlicensed frequency band based on dynamic frame structure of claim 1, wherein a subframe interval between each downlink subframe and the corresponding uplink subframe for implementing the downlink HARQ feedback is more than or equal to 3. ### Claim 7 (depends on 1) The downlink HARQ feedback method in the unlicensed frequency band based on dynamic frame structure of claim 1, wherein when frame structure used in the unlicensed frequency band comprises a plurality of uplink subframes, a number of downlink HARQ feedback messages sent on the plurality of uplink subframes is equalized. ### Claim at position 8 8-15. (canceled) ### Claim 16 A terminal, comprising: at least one processor; and a storage device storing a plurality of instructions, which when executed by the processor, causes the at least one processor to: determine whether a currently used frame structure in the unlicensed frequency band needs to be reconfigured; determine an uplink subframe for implementing a downlink Hybrid Automatic Repeat Request (HARQ) feedback corresponding to each downlink subframe according to the currently used frame structure, when the currently used frame structure does not need to be reconfigured; or determine an uplink subframe for implementing the downlink HARQ feedback corresponding to each downlink subframe in a last radio frame before the reconfiguration time point according to a first frame structure used before a reconfiguration time point and a second frame structure to be used, when the currently used frame structure needs to be reconfigured; and send a HARQ feedback message for the downlink data on the uplink subframe corresponding to the any downlink subframe for implementing the downlink HARQ feedback, when receiving downlink data sent by a base station on any downlink subframe. ### Claim 17 (depends on 16) The terminal of claim 16, wherein the at least one processor further: determines the uplink subframe for implementing the downlink HARQ feedback corresponding to each downlink subframe according to the timing sequence of the downlink HARQ feedback corresponding to the currently used frame structure. ### Claim 18 (depends on 16) The terminal of claim 16, wherein the at least one processor further: determines the uplink subframe for implementing the downlink HARQ feedback corresponding to each downlink subframe in the last radio frame before the reconfiguration time point, according to the number of the uplink subframes in the first frame structure and in the second frame structure. ### Claim 19 (depends on 18) The terminal of claim 18, wherein the at least one processor further: when the number of the uplink subframe in the first frame structure is less than or equal to the number of the uplink subframe in the second frame structure, determines the uplink subframe for implementing the downlink HARQ feedback corresponding to each downlink subframe in the last radio frame before the reconfiguration time point, according to the timing sequence of the downlink HARQ feedback corresponding to the first frame structure. ### Claim 20 (depends on 18) The terminal of claim 18, wherein the at least one processor further: when the number of the uplink subframe in the first frame structure is more than the number of the uplink subframe in the second frame structure, determines the uplink subframe for implementing the downlink HARQ feedback corresponding to each downlink subframe in the last radio frame before the reconfiguration time point, according to the timing sequence of the downlink HARQ feedback corresponding to the second frame structure. ### Claim 21 (depends on 16) The terminal of claim 16, wherein a subframe interval between each downlink subframe and the corresponding uplink subframe for implementing the downlink HARQ feedback is more than or equal to 3. ### Claim 22 (depends on 16) The terminal of claim 16, wherein when frame structure used in the unlicensed frequency band comprises a plurality of uplink subframes, a number of downlink HARQ feedback messages sent on the plurality of uplink subframes is equalized. ### Claim 23 A non-transitory storage medium having stored thereon instructions that, when executed by a processor of a terminal, causes the processor of the terminal to perform a downlink Hybrid Automatic Repeat Request (HARQ) feedback method in an unlicensed frequency band based on dynamic frame structure, the downlink HARQ feedback method comprising: determining whether a currently used frame structure in the unlicensed frequency band needs to be reconfigured; determining an uplink subframe for implementing a downlink HARQ feedback corresponding to each downlink subframe according to the currently used frame structure, when the currently used frame structure does not need to be reconfigured; or determining an uplink subframe for implementing the downlink HARQ feedback corresponding to each downlink subframe in a last radio frame before the reconfiguration time point according to a first frame structure used before a reconfiguration time point and a second frame structure to be used, when the currently used frame structure needs to be reconfigured; and sending a HARQ feedback message for the downlink data on the uplink subframe corresponding to the any downlink subframe for implementing the downlink HARQ feedback, when receiving downlink data sent by a base station on any downlink subframe. ### Claim 24 (depends on 23) The non-transitory storage medium according to claim 23, wherein determining the uplink subframe for implementing the downlink HARQ feedback corresponding to each downlink subframe according to the currently used frame structure comprises: determining the uplink subframe for implementing the downlink HARQ feedback corresponding to each downlink subframe according to the timing sequence of the downlink HARQ feedback corresponding to the currently used frame structure. ### Claim 25 (depends on 23) The non-transitory storage medium according to claim 23, wherein determining the uplink subframe for implementing the downlink HARQ feedback corresponding to each downlink subframe in the last radio frame before the reconfiguration time point, according to the first frame structure used before the reconfiguration time point and the second frame structure to be used comprises: determining the uplink subframe for implementing the downlink HARQ feedback corresponding to each downlink subframe in the last radio frame before the reconfiguration time point, according to the number of the uplink subframes in the first frame structure and in the second frame structure. ### Claim 26 (depends on 25) The non-transitory storage medium according to claim 25, further comprising: when the number of the uplink subframe in the first frame structure is less than or equal to the number of the uplink subframe in the second frame structure, determining the uplink subframe for implementing the downlink HARQ feedback corresponding to each downlink subframe in the last radio frame before the reconfiguration time point, according to the timing sequence of the downlink HARQ feedback corresponding to the first frame structure. ### Claim 27 (depends on 25) The non-transitory storage medium according to claim 25, further comprising: when the number of the uplink subframe in the first frame structure is more than the number of the uplink subframe in the second frame structure, determining the uplink subframe for implementing the downlink HARQ feedback corresponding to each downlink subframe in the last radio frame before the reconfiguration time point, according to the timing sequence of the downlink HARQ feedback corresponding to the second frame structure. ### Claim 28 (depends on 23) The non-transitory storage medium according to claim 23, wherein a subframe interval between each downlink subframe and the corresponding uplink subframe for implementing the downlink HARQ feedback is more than or equal to 3.