# US 10,873,973 B2 · Wireless communication method and wireless communication terminal for spatial reuse operation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,873,973 B2 - Document ID: US10873973B2 - Status: Granted - Kind: B2 - Application number: 16/219,937 - Filed: 2018-12-13 - Published: 2019-05-02 - Granted: 2020-12-22 - Earliest claimed: 2016-06-14 - Assignees: Wilus Institute of Standards and Technology Inc.; SK Telecom Co., Ltd. - Applicants: Wilus Institute of Standards and Technology Inc.; SK Telecom Co., Ltd. - Inventors: Geonjung Ko; Juhyung Son; Woojin Ahn; Jinsam Kwak - Web page: https://patentgrep.com/patent/US10873973B2 ## CPC - H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA] - H04L 47/824: {Applicable to portable or mobile terminals} - H04W 28/02: Traffic management, e.g. flow control or congestion control - H04W 40/00: Communication routing or communication path finding - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 74/08: Non-scheduled access, e.g. ALOHA (hybrid access H04W74/02) - H04W 84/12: WLAN [Wireless Local Area Networks] - H04W 88/08: Access point devices - H04W 80/02: Data link layer protocols - Y02D 30/70: in wireless communication networks - 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) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract The present invention relates a wireless communication method and a wireless communication terminal for supporting a spatial reuse operation of an overlapping basic service set to efficiently use a wireless resource. To this end, provided are a base wireless communication terminal including: a processor; and a communication unit, wherein the processor receives a PHY protocol data unit (PPDU) through the communication unit, determines whether the PPDU contains an intra-BSS frame or contains an inter-BSS frame based on preamble information of the PPDU, and performs either a first operation or a second operation distinct from each other according to a determination result and a wireless communication method using the same. ## Claims ### Claim 1 A wireless communication terminal, the terminal comprising: a processor; and a communication unit, wherein the processor is configured to: receive a PHY protocol data unit (PPDU) through the communication unit, determine whether the PPDU contains an intra-BSS(Basic Service Set) frame or an inter-BSS frame based on at least one of a first specific condition or a second specific condition, wherein the first specific condition is used to determine whether the PPDU includes the inter-BSS frame, the second specific condition is used to determine whether the PPDU includes the intra-BSS frame, and whether the PPDU includes the intra-BSS frame or the inter-BSS frame is determined by a condition of a MAC address among the first specific condition and the second specific condition when the PPDU satisfies both the first specific condition and the second specific condition, and perform either a first operation or a second operation distinct from each other according to a determination result. ### Claim 2 (depends on 1) The wireless communication terminal of claim 1, wherein whether the first specific condition is satisfied is determined based on a high efficiency(HE)-signal(SIG)-B of the PPDU, when the PPDU is an HE multi-user (MU) PPDU. ### Claim 3 (depends on 1) The wireless communication terminal of claim 1, wherein whether each of the first specific condition or the second specific condition is satisfied is determined based on whether a value related to an association identifier(AID) included in the PPDU equals to a value assigned by a BSS associated with the base wireless communication terminal. ### Claim 4 (depends on 1) The wireless communication terminal of claim 1, wherein whether each of the first specific condition or the second specific condition is satisfied is determined based on a BSS color of a BSS color field included in a HE-SIG-A, when the PPDU includes the HE-SIG-A including the BSS color field. ### Claim 5 (depends on 1) The wireless communication terminal of claim 1, wherein whether each of the first specific condition or the second specific condition is satisfied is determined based on a BSS color of a BSS color field included in a HE-SIG-A and information of a user specific field in HE-SIG-B of the PPDU, wherein a determination based on the user specific field takes precedence over a determination based on the BSS color field, when both of the first specific condition and the second specific condition are satisfied. ### Claim 6 (depends on 1) The wireless communication terminal of claim 1, wherein whether each of the first specific condition or the second specific condition is satisfied is determined based on a BSS color of a BSS color field included in a HE-SIG-A and information of a MAC address field of a MAC frame contained in the PPDU, and wherein a determination based on the MAC address field takes precedence over a determination based on the user specific field, when both of the first specific condition and the second specific condition are satisfied. ### Claim 7 (depends on 1) The wireless communication terminal of claim 1, wherein when a received frame is determined as an intra-BSS frame, the processor determines whether a channel is busy based on a first CCA threshold, and wherein when the received frame is determined as an inter-BSS frame, the processor determines whether the channel is busy based on both the first CCA threshold and a second CCA threshold which is distinct from the first CCA threshold. ### Claim 8 (depends on 1) The wireless communication terminal of claim 1, wherein when a received frame is determined as an intra-BSS frame, the processor sets or updates a first network allocation vector (NAV), and wherein when the received frame is determined as an inter-BSS frame, the processor sets or updates a second NAV. ### Claim 9 (depends on 8) The wireless communication terminal of claim 8, wherein the second CCA threshold has a value equal to or greater than the first CCA threshold. ### Claim 10 (depends on 1) The wireless communication terminal of claim 1, whether each of the first specific condition or the second specific condition is satisfied is determined based on information of a MAC address field of a MAC frame contained in the PPDU or a specific HE-SIG field of the PPDU. ### Claim 11 (depends on 1) The wireless communication terminal of claim 1, wherein the first specific condition is based on information of a MAC address field of a MAC frame contained in the PPDU, wherein the second specific condition is based on a BSS color of a BSS color field included in a HE-SIG-A, and wherein the PPDU is determined to include the inter-BSS frame according to the information of the MAC address field of the MAC frame when the PPDU satisfies both the first specific condition by the information of the MAC address field of the MAC frame and the second specific condition by the BSS color of the BSS color field included in the HE-SIG-A. ### Claim 12 A wireless communication method of a wireless communication terminal, the method comprising: receiving a PHY protocol data unit (PPDU); determining whether the PPDU contains an intra-BSS(Basic Service Set) frame or an inter-BSS frame based on at least one of a first specific condition or a second specific condition, wherein the first specific condition is used to determine whether the PPDU includes the inter-BSS frame, the second specific condition is used to determine whether the PPDU includes the intra-BSS frame, and whether the PPDU includes the intra-BSS frame or the inter-BSS frame is determined by a condition of a MAC address among the first specific condition and the second specific condition when the PPDU satisfies both the first specific condition and the second specific condition; and performing either a first operation or a second operation distinct from each other according to a determination result. ### Claim 13 (depends on 12) The wireless communication method of claim 12, wherein whether the first specific condition is satisfied is determined based on a high efficiency(HE)-signal(SIG)-B of the PPDU, when the PPDU is an HE multi-user (MU) PPDU. ### Claim 14 (depends on 13) The wireless communication method of claim 13, whether each of the first specific condition or the second specific condition is satisfied is determined based on whether a value related to an association identifier(AID) included in the PPDU equals to a value assigned by a BSS associated with the base wireless communication terminal. ### Claim 15 (depends on 12) The wireless communication method of claim 12, wherein whether each of the first specific condition or the second specific condition is satisfied is determined based on a BSS color of a BSS color field included in a HE-SIG-A, when the PPDU includes the HE-SIG-A including the BSS color field. ### Claim 16 (depends on 12) The wireless communication method of claim 12, wherein whether each of the first specific condition or the second specific condition is satisfied is determined based on a BSS color of a BSS color field included in a HE-SIG-A and information of a user specific field in HE-SIG-B of the PPDU, wherein a determination based on the user specific field takes precedence over a determination based on the BSS color field, when both of the first specific condition and the second specific condition are satisfied. ### Claim 17 (depends on 12) The wireless communication method of claim 12, wherein whether each of the first specific condition or the second specific condition is satisfied is determined based on a BSS color of a BSS color field included in a HE-SIG-A and information of a MAC address field of a MAC frame contained in the PPDU, and wherein a determination based on the MAC address field takes precedence over a determination based on the user specific field, when both of the first specific condition and the second specific condition are satisfied. ### Claim 18 (depends on 12) The wireless communication method of claim 12, wherein when a received frame is determined as an intra-BSS frame, the method comprises determining whether a channel is busy based on a first CCA threshold, and wherein when the received frame is determined as an inter-BSS frame, the method comprises determining whether the channel is busy based on both the first CCA threshold and a second CCA threshold which is distinct from the first CCA threshold. ### Claim 19 (depends on 12) The wireless communication method of claim 12, wherein when a received frame is determined as an intra-BSS frame, the method comprises setting or updating a first network allocation vector (NAV), and wherein when the received frame is determined as an inter-BSS frame, the method comprises setting or updating a second NAV. ### Claim 20 (depends on 19) The wireless communication method of claim 19, wherein the second CCA threshold has a value equal to or greater than the first CCA threshold.