# US 12,120,744 B2 · Wireless communication terminal and wireless communication method for multiuser EDCA operation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,120,744 B2 - Document ID: US12120744B2 - Status: Granted - Kind: B2 - Application number: 18/212,702 - Filed: 2023-06-21 - Published: 2023-10-19 - Granted: 2024-10-15 - Earliest claimed: 2016-09-23 - 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: Woojin Ahn; Juhyung Son; Jinsam Kwak; Geonjung Ko - Web page: https://patentgrep.com/patent/US12120744B2 ## CPC - H04W 74/0816: with collision avoidance - H04B 7/0452: Multi-user MIMO systems - H04W 74/002: {Transmission of channel access control information} - H04W 84/12: WLAN [Wireless Local Area Networks] - H04W 74/085: {collision avoidance} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION ## Abstract The present invention relates to a wireless communication terminal and a wireless communication method for a multi-user EDCA operation, and more particularly, to a wireless communication terminal and a wireless communication method for performing a combination of a legacy EDCA operation and a multi-user EDCA operation. To this end, provided are a wireless communication terminal including: a communication unit; and a processor configured to control transmission and reception of a wireless signal through the communication unit, wherein the processor updates enhanced distributed channel access (EDCA) parameters for channel access, the EDCA parameters being updated based on an EDCA parameter set selected from a first EDCA parameter set and a second EDCA parameter set, and performs channel access based on the updated EDCA parameters and a wireless communication method using the same. ## Claims ### Claim 1 A wireless communication terminal, the terminal comprising: a communication unit; and a processor configured to control transmission and reception of a wireless signal through the communication unit, wherein the processor is configured to: receive a first frame including at least one of a first enhanced distributed channel access(EDCA) parameter set and a second EDCA parameter set, transmit a second frame related to a specific operation of the terminal, wherein the second frame includes an operation mode subfield including a disable subfield indicating whether the terminal participates in the specific operation, and perform a channel access based on updated EDCA parameters according to a parameter set selected among the first EDCA parameter set or the second EDCA parameter set, wherein the EDCA parameters are updated based on the first EDCA parameter set based on whether the disable subfield indicates participation in the specific operation and whether an immediate response of the second frame is received according to whether the disable subfield indicates participation in the specific operation. ### Claim 2 (depends on 1) The wireless communication terminal of claim 1, wherein the EDCA parameters are updated based on the first EDCA parameter set after the immediate response of the second frame is received when the disable subfield indicates that the terminal does not participate in the specific operation. ### Claim 3 (depends on 1) The wireless communication terminal of claim 1, wherein the second EDCA parameter set includes first timer subfields indicating a timer value indicating a duration for performing the channel access for each of access categories. ### Claim 4 (depends on 3) The wireless communication terminal of claim 3, wherein each of EDCA timers corresponding to each of the access categories of the terminal is updated based on each of the first timer subfields when the EDCA parameters are updated based on the second EDCA parameter set. ### Claim 5 (depends on 4) The wireless communication terminal of claim 4, wherein each of the EDCA timers for each of the access categories is set to ‘0’ when the immediate response to the second frame is received. ### Claim 6 (depends on 4) The wireless communication terminal of claim 4, wherein the EDCA parameters are updated based on the first EDCA parameter set most recently received from a base wireless communication terminal associated with the terminal when each of the EDCA timers reaches ‘0’. ### Claim 7 A wireless communication method of a wireless communication terminal, the method comprising: receiving a first frame including at least one of a first enhanced distributed channel access(EDCA) parameter set and a second EDCA parameter set; transmitting a second frame related to a specific operation of the terminal, wherein the second frame includes an operation mode subfield including a disable subfield indicating whether the terminal participates in the specific operation; and performing a channel access based on updated EDCA parameters according to a parameter set selected among the first EDCA parameter set or the second EDCA parameter set, wherein the EDCA parameters are updated based on the first EDCA parameter set based on whether the disable subfield indicates participation in the specific operation and whether an immediate response of the second frame is received according to whether the disable subfield indicates participation in the specific operation. ### Claim 8 (depends on 7) The wireless communication method of claim 7, wherein the EDCA parameters are updated based on the first EDCA parameter set after the immediate response of the second frame is received when the disable subfield indicates that the terminal does not participate in the specific operation. ### Claim 9 (depends on 7) The wireless communication method of claim 7, Wherein the second EDCA parameter set includes first timer subfields indicating a timer value indicating a duration for performing the channel access for each of access categories. ### Claim 10 (depends on 9) The wireless communication method of claim 9, wherein each of EDCA timers corresponding to each of the access categories of the terminal is updated based on each of the first timer subfields when the EDCA parameters are updated based on the second EDCA parameter set. ### Claim 11 (depends on 10) The wireless communication method of claim 10, wherein each of the EDCA timers for each of the access categories is set to ‘0’ when hen the immediate response to the second frame is received. ### Claim 12 (depends on 10) The wireless communication method of claim 10, wherein the EDCA parameters are updated based on the first EDCA parameter set most recently received from a base wireless communication terminal associated with the terminal when each of the EDCA timers reaches ‘0’.