# US 11,452,109 B2 · Wireless communication method and apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,452,109 B2 - Document ID: US11452109B2 - Status: Granted - Kind: B2 - Application number: 17/037,263 - Filed: 2020-09-29 - Published: 2021-01-28 - Granted: 2022-09-20 - Earliest claimed: 2016-01-11 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Genadiy Tsodik; Shimon Shilo; Doron Ezri; Oded Redlich; Wei Lin; Jun Luo - Web page: https://patentgrep.com/patent/US11452109B2 ## CPC - H04W 72/541: using the level of interference - H04W 16/14: Spectrum sharing arrangements {between different networks} - H04W 24/02: Arrangements for optimising operational condition - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 72/53: based on regulatory allocation policies - H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA] - H04W 76/10: Connection setup - H04W 76/15: Setup of multiple wireless link connections - H04W 16/10: Dynamic resource partitioning - H04W 74/00: Wireless channel access - H04W 84/12: WLAN [Wireless Local Area Networks] - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract The method includes: receiving, by a second transmit end, policy information sent by a first transmit end, where the second transmit end belongs to a second BSS, the first transmit end is a transmit end that is in a first basis service set and that transmits data by using a first link, and the policy information is used to indicate a condition that the second transmit end needs to satisfy to transmit data by using a second link, or used to indicate whether the second transmit end is allowed to transmit data by using a second link; and determining, by the second transmit end based on the policy information, whether to transmit data by using the second link. According to the wireless communication method, a spatial reuse transmission policy can be adjusted dynamically based on an actual situation of a current network. This improves a system throughput. ## Claims ### Claim 1 A wireless communication method, wherein the method is applied to a wireless local area network, the wireless local area network comprises a first basic service set (BSS) and a second BSS, and a coverage area of the first BSS partially overlaps with a coverage area of the second BSS, and the method comprises: receiving, by a second transmit end, policy information sent by a first transmit end, wherein the second transmit end belongs to the second BSS, the first transmit end is a transmit end that is in the first BSS and transmits data by using a first link, the policy information is used to indicate a condition that the second transmit end needs to satisfy to transmit data by using a second link or the policy information is used to indicate whether the second transmit end is allowed to transmit data by using the second link, time domain resources corresponding to the second link are partially the same as time domain resources corresponding to the first link, and frequency domain resources corresponding to the second link are partially or completely the same as frequency domain resources corresponding to the first link, wherein the policy information comprises indication information of a maximum allowed interference value; determining the maximum allowed interference value based on an energy value of an input signal of a receive end of the first link, wherein the first transmit end determines the maximum allowed interference value of the receive end of the first link based on a depth gap value, wherein the depth gap value is a difference between a first interference value and a second interference value, the first interference value is an energy value of a signal from the second BSS that is received by the receive end of the first link, and the second interference value is an energy value of a signal from the second BSS that is received by a device, in the first BSS, nearest to the second BSS; and determining, by the second transmit end, based on the policy information, whether to perform transmission. ### Claim 2 (depends on 1) The method according to claim 1, wherein the policy information comprises adjustment value indication information for a clear channel assessment (CCA) threshold used by the second transmit end. ### Claim 3 (depends on 1) The method according to claim 1, wherein the method further comprises: determining, by the second transmit end, a maximum energy value of an interference signal, wherein the interference signal is a signal from the first BSS that is received by the second transmit end; and the determining, by the second transmit end based on the policy information, whether to perform transmission comprises: determining, by the second transmit end based on a value relationship between the maximum allowed interference value and the maximum energy value of the interference signal, whether to transmit data by using the second link. ### Claim 4 (depends on 1) The method according to claim 1, wherein the policy information comprises first indication information and second indication information, the first indication information is used to indicate that the first link is a downlink transmission link, and the second indication information is used to indicate whether the second transmit end is allowed to transmit data by using the second link; and the determining, by the second transmit end, based on the policy information, whether to perform transmission comprises: determining, by the second transmit end based on the first indication information and the second indication information indicating whether the second transmit end is allowed to transmit data by using the second link, whether to transmit data by using the second link. ### Claim 5 (depends on 1) The method according to claim 1, wherein the policy information is carried in a data packet transmitted by using the first link. ### Claim 6 A wireless communication method, wherein the method is applied to a wireless local area network, the wireless local area network comprises a first basic service set (BSS) and a second BSS, and a coverage area of the first BSS partially overlaps with a coverage area of the second BSS, and the method comprises: determining, by a first transmit end, policy information, wherein the first transmit end is a transmit end that is in the first BSS and transmits data by using a first link, the policy information is used to indicate a condition that a second transmit end needs to satisfy to transmit data by using a second link or the policy information is used to indicate whether a second transmit end is allowed to transmit data by using the second link, the second transmit end belongs to the second BSS, time domain resources corresponding to the second link are partially the same as time domain resources corresponding to the first link, and frequency domain resources corresponding to the second link are partially or completely the same as frequency domain resources corresponding to the first link, wherein the policy information comprises indication information of a maximum allowed interference value; determining the maximum allowed interference value based on an energy value of an input signal of a receive end of the first link, wherein the first transmit end determines the maximum allowed interference value of the receive end of the first link based on a depth gap value, wherein the depth gap value is a difference between a first interference value and a second interference value, the first interference value is an energy value of a signal from the second BSS that is received by the receive end of the first link, and the second interference value is an energy value of a signal from the second BSS that is received by a device, in the first BSS, nearest to the second BSS; and sending, by the first transmit end, the policy information. ### Claim 7 (depends on 6) The method according to claim 6, wherein the policy information comprises adjustment value indication information for a clear channel assessment (CCA) threshold used by the second transmit end; and the determining, by the first transmit end, policy information comprises: receiving, by the first transmit end, the adjustment value indication information sent by a receive end of the first link; and determining, by the first transmit end, the adjustment value indication information as the policy information. ### Claim 8 (depends on 6) The method according to claim 6, wherein the method further comprises: receiving, by the first transmit end, maximum interference value information, wherein the maximum interference value information is used to indicate a maximum energy value of an interference signal from the second BSS that is received by the receive end of the first link; and the determining, by a first transmit end, policy information comprises: determining, by the first transmit end, second indication information based on a value relationship between the maximum energy value of the interference signal and the maximum allowed interference value, wherein the second indication information is used to indicate whether the second transmit end is allowed to transmit data by using the second link, and the maximum allowed interference value is a maximum interference value that is of the signal from the second BSS that is allowed by the receive end of the first link. ### Claim 9 (depends on 8) The method according to claim 8, wherein the policy information further comprises first indication information, wherein the first indication information is used to indicate that the first link is a downlink transmission link, so that the second transmit end determines, based on the first indication information and the second indication information, whether to transmit data by using the second link. ### Claim 10 (depends on 6) The method according to claim 6, wherein the first transmit end further determines the maximum allowed interference value based on a margin, wherein the margin is used to improve robustness of spatial reuse transmission. ### Claim 11 (depends on 6) The method according to claim 6, wherein the policy information is carried in a data packet transmitted by using the first link. ### Claim 12 A wireless communications apparatus, the apparatus being configured in a wireless local area network, the wireless local area network comprising a first basic service set (BSS) and a second BSS, and a coverage area of the first BSS partially overlaps with a coverage area of the second BSS, the apparatus comprising: a transceiver configured to receive policy information sent by a first transmit end, wherein the first transmit end is a transmit end that is in the first BSS and transmits data by using a first link, the policy information is used to indicate a condition that a second transmit end needs to satisfy to transmit data by using a second link or the policy information is used to indicate whether the second transmit end is allowed to transmit data by using a second link, the second transmit end belonging to the second BSS, time domain resources corresponding to the second link are partially the same as time domain resources corresponding to the first link, and frequency domain resources corresponding to the second link are partially or completely the same as frequency domain resources corresponding to the first link, wherein the policy information comprises indication information of a maximum allowed interference value, wherein the maximum allowed interference value is determined based on an energy value of an input signal of a receive end of the first link, wherein the first transmit end determines the maximum allowed interference value of the receive end of the first link based on a depth gap value, wherein the depth gap value is a difference between a first interference value and a second interference value, the first interference value is an energy value of a signal from the second BSS that is received by the receive end of the first link, and the second interference value is an energy value of a signal from the second BSS, in the first BSS, nearest to the second BSS; and a processor configured to determine, based on the policy information received by the transceiver, whether to perform transmission. ### Claim 13 (depends on 12) The apparatus according to claim 12, wherein the policy information comprises adjustment value indication information for a clear channel assessment (CCA) threshold used by the second transmit end. ### Claim 14 (depends on 12) The apparatus according to claim 12, wherein the processor comprises: a first processor configured to determine a maximum energy value of an interference signal, wherein the interference signal is a signal from the first BSS that is received by the second transmit end; and a second processor configured to determine, based on a value relationship between the maximum allowed interference value and the maximum energy value of the interference signal, whether to transmit data by using the second link. ### Claim 15 (depends on 12) The apparatus according to claim 12, wherein the policy information comprises first indication information and second indication information, the first indication information is used to indicate that the first link is a downlink transmission link, and the second indication information is used to indicate whether the second transmit end is allowed to transmit data by using the second link; and the processor is further configured to determine, based on the first indication information and the second indication information indicating whether the second transmit end is allowed to transmit data by using the second link, whether to transmit data by using the second link.