# US 2018/0324596 A1 · Data transmission 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 2018/0324596 A1 - Document ID: US20180324596A1 - Status: Published application - Kind: A1 - Application number: 16/031,700 - Filed: 2018-07-10 - Published: 2018-11-08 - Earliest claimed: 2016-01-11 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Zhengzheng XIANG; Jiyong PANG; Jun ZHU - Web page: https://patentgrep.com/patent/US20180324596A1 ## CPC - H04W 16/10: Dynamic resource partitioning - H04W 72/04: Wireless resource allocation - H04W 72/046: {the resource being in the space domain, e.g. beams} - H04W 72/27: between access points - H04W 72/541: using the level of interference - H04W 74/006: {in the downlink, i.e. towards the terminal} - H04W 74/0816: with collision avoidance - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Embodiments of the present invention provide a data transmission method and an apparatus. In the method, a communications node receives N spatial reuse parameters SRPs; the communications node determines, based on the received N SRPs, that the communications node can perform spatial reuse link transmission; and the communications node transmits data by using a spatial reuse link, and processes data transmission based on the spatial reuse link. Whether spatial reuse link transmission can be performed is determined based on the received SRPs, so as to reduce mutual interference between a primary link and the spatial reuse link during data transmission, and improve transmission quality. ## Claims ### Claim 1 A data transmission method, comprising: receiving, by a communications node, N spatial reuse parameters (SRPs); determining, by the communications node based on the received N SRPs, that the communications node is capable of performing spatial reuse link transmission; and transmitting, by the communications node, data by using a spatial reuse link. ### Claim 2 (depends on 1) The method according to claim 1, wherein N is a positive integer greater than or equal to 2. ### Claim 3 (depends on 1) The method according to claim 1, wherein the SRP comprises an indication parameter used to indicate whether spatial reuse is allowed. ### Claim 4 (depends on 3) The method according to claim 3, wherein the determining, based on the received N SRPs, that the communications node is capable of performing spatial reuse link transmission comprises: when indication parameters carried in the received N SRPs all indicate that spatial reuse is allowed, determining that the communications node is capable of performing spatial reuse link transmission. ### Claim 5 (depends on 1) The method according to claim 1, wherein the SRP comprises a type parameter used to indicate a type of a link corresponding to a physical layer protocol data unit (PPDU) carrying the SRP, and the type comprises at least one of a primary link and a spatial reuse link. ### Claim 6 (depends on 5) The method according to claim 5, wherein the determining, based on the received N SRPs, that the communications node is capable of performing spatial reuse link transmission comprises: when type parameters comprised in the received N SRPs all indicate primary links, determining that the communications node is capable of performing spatial reuse link transmission; and when type parameters comprised in the received N SRPs all indicate spatial reuse links, determining that the communications node is capable of performing spatial reuse link transmission. ### Claim 7 (depends on 1) The method according to claim 1, wherein the determining, by the communications node based on the received N SRPs, that the communications node is capable of performing spatial reuse link transmission comprises: determining, by the communications node based on a current moment T, Q effective SRPs of the N SRPs, wherein Q is a positive integer less than or equal to N, and the effective SRPs are SRPs whose corresponding transmission opportunity (TXOP) transmission times comprise the current moment T; adjusting, by the communications node, a transmit parameter to meet the Q effective SRPs, wherein the transmit parameter of the communications node is a function of the Q effective SRPs: TX=f(SRP1,SRP2, . . . ,SRPQ); and if the transmit parameter meets a transmission requirement of the spatial reuse link, determining that the communications node is capable of performing spatial reuse link transmission. ### Claim 8 (depends on 7) The method according to claim 7, wherein TXOP transmission times corresponding to the N SRPs are N different TXOP transmission times; or TXOP transmission times corresponding to the N SRPs are O different TXOP transmission times, wherein O is a positive integer less than N. ### Claim 9 (depends on 7) The method according to claim 7, wherein the function TX=f(SRP1, SRP2, . . . , SRPQ) is specifically: TX=P=min{P1(SRP1),P2(SRP2), . . . ,PQ(SRPQ)}, wherein Pi(SRPi) is a maximum allowable value of a transmit power meeting SRPi; and if the determined P meets the transmission requirement of the spatial reuse link, it is determined that the communications node is capable of performing spatial reuse link transmission. ### Claim 10 (depends on 7) The method according to claim 7, wherein the SRP is a clear channel assessment (CCA) value of a spatial reuse link required by a transmission link on which a physical layer protocol data unit (PPDU) carrying the SRP is transmitted; the communications node determines, according to the following formula, a CCA value for performing transmission by using the spatial reuse link: CCA=min{SRP1,SRP2, . . . ,SRPQ}; the communications node determines, according to the following formula, a maximum value of a transmit power for performing transmission by using the spatial reuse link: P=P0−(CCA−CCA0), wherein P0 is a maximum transmit power of the communications node during non-spatial reuse link transmission, and CCA0 is a CCA value of the communications node during non-spatial reuse link transmission; and if the determined P meets the transmission requirement of the spatial reuse link, it is determined that the communications node is capable of performing spatial reuse link transmission. ### Claim 11 A communications node, comprising: a receiver, configured to receive N SRPs; and a processor, configured to determine, based on the received N SRPs, that the communications node is capable of performing spatial reuse link transmission, and the communications node transmits data by using a spatial reuse link. ### Claim 12 (depends on 11) The communications node according to claim 11, wherein N is a positive integer greater than or equal to 2. ### Claim 13 (depends on 11) The communications node according to claim 11, wherein the SRP comprises an indication parameter used to indicate whether spatial reuse is allowed. ### Claim 14 (depends on 13) The communications node according to claim 13, wherein the processor is further configured to: when indication parameters carried in the received N SRPs all indicate that spatial reuse is allowed, determine that the communications node is capable of performing spatial reuse link transmission. ### Claim 15 (depends on 13) The communications node according to claim 13, wherein the SRP comprises a type parameter used to indicate a type of a link corresponding to a physical layer protocol data unit (PPDU) carrying the SRP, and the type comprises at least one of a primary link and a spatial reuse link. ### Claim 16 (depends on 15) The communications node according to claim 15, wherein the processor is further configured to: when type parameters comprised in the received N SRPs all indicate primary links, determine that the communications node is capable of performing spatial reuse link transmission; or when type parameters comprised in the received N SRPs all indicate spatial reuse links, determine that the communications node is capable of performing spatial reuse link transmission. ### Claim 17 (depends on 11) The communications node according to claim 11, wherein the processor is further configured to: determine, based on a current moment T, Q effective SRPs of the N SRPs, wherein Q is a positive integer less than or equal to N, and the effective SRPs are SRPs whose corresponding transmission opportunity (TXOP) transmission times comprise the current moment T; adjust a transmit parameter to meet the Q effective SRPs, wherein the transmit parameter is a function of the Q effective SRPs: TX=f(SRP1,SRP2, . . . ,SRPQ); and if the transmit parameter meets a transmission requirement of the spatial reuse link, determine that the communications node is capable of performing spatial reuse link transmission. ### Claim 18 (depends on 17) The communications node according to claim 17, wherein TXOP transmission times corresponding to the N SRPs are N different TXOP transmission times; or TXOP transmission times corresponding to the N SRPs are O different TXOP transmission times, wherein O is a positive integer less than N. ### Claim 19 (depends on 17) The communications node according to claim 17, wherein the function TX=f(SRP1, SRP2, . . . , SRPQ) is: TX=P=min{P1(SRP1),P2(SRP2), . . . ,PQ(SRPQ)}, wherein Pi(SRPi) is a maximum allowable value of a transmit power meeting SRPi; and if the determined P meets the transmission requirement of the spatial reuse link, it is determined that the communications node is capable of performing spatial reuse link transmission. ### Claim 20 (depends on 17) The communications node according to claim 17, wherein the SRP is a clear channel assessment (CCA) value of a spatial reuse link required by a transmission link on which a physical layer protocol data unit (PPDU) carrying the SRP is transmitted; the processor is further configured to determine, according to the following formula, a CCA value for performing transmission by using the spatial reuse link: CCA=min{SRP1,SRP2, . . . ,SRPQ}; the processor determines, according to the following formula, a maximum value of a transmit power for performing transmission by using the spatial reuse link: P=P0−(CCA−CCA0), wherein P0 is a maximum transmit power of the communications node during non-spatial reuse link transmission, and CCA0 is a CCA value of the communications node during non-spatial reuse link transmission; and if the determined P meets the transmission requirement of the spatial reuse link, it is determined that the communications node is capable of performing spatial reuse link transmission.