# US 2020/0288498 A1 · Method For Listening On Uplink Channel And Apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0288498 A1 - Document ID: US20200288498A1 - Status: Published application - Kind: A1 - Application number: 16/828,332 - Filed: 2020-03-24 - Published: 2020-09-10 - Earliest claimed: 2017-09-25 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Yuan LI; Lei GUAN - Web page: https://patentgrep.com/patent/US20200288498A1 ## CPC - H04W 74/08: Non-scheduled access, e.g. ALOHA (hybrid access H04W74/02) - H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA] - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Example uplink channel listening methods and apparatus are described. In one example method, a contention window size (CWS) is determined with reference to a time threshold, for example, a timer. After sending an uplink burst, if a terminal device does not receive indication information carrying a hybrid automatic repeat request (HARQ) status, the terminal device increases the CWS and then performs channel listening. ## Claims ### Claim 1 A method, implemented by a terminal device, comprising: performing first listen before talk (LBT); and sending a first data packet on a first uplink burst after the first LBT succeeds; and determining a second contention window size (CWS), wherein determining the second CWS comprises at least one of following: on condition that a first time length is greater than or equal to a first time threshold and that first indication information indicating a hybrid automatic repeat request (HARQ) status is not received after the first uplink burst, determining that the second CWS is greater than a first CWS; or on condition that the first time length is less than or equal to the first time threshold and the first indication information indicating the HARQ status is not received after the first uplink burst, determining that the second CWS is equal to the first CWS; and performing second LBT based on the second CWS, wherein: an interval between a first reference time unit and a second reference time unit that corresponds to the first uplink burst is a first time length, wherein the first CWS corresponds to a LBT previous to the second LBT, and wherein the first reference time unit is later than the second reference time unit. ### Claim 2 (depends on 1) The method according to claim 1, wherein the first indication information indicating the HARQ status is not received after the first uplink burst comprises: the first indication information indicating the HARQ status is not received after the second reference time unit corresponding to the first uplink burst and before the first reference time unit. ### Claim 3 (depends on 1) The method according to claim 1, wherein the second reference time unit corresponding to the first uplink burst is a start time unit of the first uplink burst. ### Claim 4 (depends on 1) The method according to claim 1, further comprising: sending a second data packet on a second uplink burst on condition that the second LBT succeeds, wherein the second uplink burst is later than the first uplink burst. ### Claim 5 (depends on 1) The method according to claim 1, wherein the first CWS and the second CWS correspond to a same access priority. ### Claim 6 (depends on 1) The method according to claim 1, wherein the first reference time unit is a time unit for determining the second CWS, or wherein the first reference time unit is a start time unit of a second uplink burst. ### Claim 7 A wireless apparatus, comprising: a transceiver; a memory storage comprising instructions; and one or more hardware processors in communication with the memory storage, wherein the the instructions, when executed by the one or more hardware processors, instruct the one or more hardware processors to: perform first listen before talk (LBT); send a first data packet on a first uplink burst after the first LBT succeeds; and determine a second contention window size (CWS), wherein determining the second CWS comprising at least one of following: on condition that a first time length is greater than or equal to a first time threshold and that first indication information indicating a hybrid automatic repeat request (HARQ) status is not received after the first uplink burst, determining that the second CWS is greater than a first CWS; or on condition that the first time length is less than or equal to the first time threshold and the first indication information indicating the HARQ status is not received after the first uplink burst, determining that the second CWS is equal to the first CWS; and perform second LBT based on the second CWS, wherein: an interval between a first reference time unit and a second reference time unit that corresponds to the first uplink burst is a first time length, wherein the first CWS corresponds to LBT previous to the second LBT, and wherein the first reference time unit is later than the second reference time unit. ### Claim 8 (depends on 7) The wireless apparatus according to claim 7, wherein the first indication information indicating the HARQ status is not received after the first uplink burst comprises: the first indication information indicating the HARQ status is not received after the second reference time unit corresponding to the first uplink burst and before the first reference time unit. ### Claim 9 (depends on 7) The wireless apparatus according to claim 7, wherein the second reference time unit corresponding to the first uplink burst is a start time unit of the first uplink burst. ### Claim 10 (depends on 7) The wireless apparatus according to claim 7, wherein the instructions further instruct the one or more hardware processors to: send a second data packet on a second uplink burst on condition that the second LBT succeeds, wherein the second uplink burst is later than the first uplink burst. ### Claim 11 (depends on 7) The wireless apparatus according to claim 7, wherein the first CWS and the second CWS correspond to a same access priority. ### Claim 12 (depends on 7) The wireless apparatus according to claim 7, wherein: the first reference time unit is a time unit for determining the second CWS; or the first reference time unit is a start time unit of a second uplink burst. ### Claim 13 (depends on 7) The wireless apparatus according to claim 7, wherein the LBT previous to the second LBT is the same as the first LBT. ### Claim 14 A non-transitory computer-readable medium storing computer executable instructions, wherein the instructions, when executed by one or more processors, instruct the one or more processors to perform operations comprising: performing first listen before talk (LBT); sending a first data packet on a first uplink burst after the first LBT succeeds; determining a second contention window size (CWS), wherein determining the second CWS comprises at least one of following: on condition that a first time length is greater than or equal to a first time threshold and that first indication information indicating a hybrid automatic repeat request (HARQ) status is not received after the first uplink burst, determining that the second CWS is greater than a first CWS; or on condition that the first time length is less than or equal to the first time threshold and the first indication information indicating the HARQ status is not received after the first uplink burst, determining that the second CWS is equal to the first CWS; and performing second LBT based on the second CWS, wherein: an interval between a first reference time unit and a second reference time unit that corresponds to the first uplink burst is a first time length, wherein the first CWS corresponds to a LBT previous to the second LBT, and wherein the first reference time unit is later than the second reference time unit. ### Claim 15 (depends on 14) The non-transitory computer-readable medium according to claim 14, wherein the first indication information indicating the HARQ status is not received after the first uplink burst comprises: the first indication information indicating the HARQ status is not received after the second reference time unit corresponding to the first uplink burst and before the first reference time unit. ### Claim 16 (depends on 14) The non-transitory computer-readable medium according to claim 14, wherein the second reference time unit corresponding to the first uplink burst is a start time unit of the first uplink burst. ### Claim 17 (depends on 14) The non-transitory computer-readable medium according to claim 14, wherein the operations further comprise: sending a second data packet on a second uplink burst on condition that the second LBT succeeds, wherein the second uplink burst is later than the first uplink burst. ### Claim 18 (depends on 14) The non-transitory computer-readable medium according to claim 14, wherein the first CWS and the second CWS correspond to a same access priority. ### Claim 19 (depends on 14) The non-transitory computer-readable medium according to claim 14, wherein the first reference time unit is a time unit for determining the second CWS, or wherein the first reference time unit is a start time unit of a second uplink burst. ### Claim 20 (depends on 14) The non-transitory computer-readable medium according to claim 14, wherein the LBT previous to the second LBT is the same as the first LBT.