# US 12,192,112 B2 · Wireless communication method for multi-user transmission scheduling, and wireless communication terminal using same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,192,112 B2 - Document ID: US12192112B2 - Status: Granted - Kind: B2 - Application number: 17/551,195 - Filed: 2021-12-15 - Published: 2022-04-07 - Granted: 2025-01-07 - Earliest claimed: 2015-06-16 - 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: Jinsoo Ahn; Yongho Kim; Jinsam Kwak; Juhyung Son - Web page: https://patentgrep.com/patent/US12192112B2 ## CPC - H04L 47/52: by attributing bandwidth to queues - H04L 1/1607: Details of the supervisory signal - H04L 1/18: Automatic repetition systems, e.g. Van Duuren systems - H04L 47/58: {Changing or combining different scheduling modes, e.g. multimode scheduling} - H04L 47/6275: based on priority - H04W 74/002: {Transmission of channel access control information} - H04W 74/085: {collision avoidance} - H04W 84/12: WLAN [Wireless Local Area Networks] - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract The present invention relates to a wireless communication terminal and a wireless communication method for efficiently scheduling uplink multi-user transmission. To this end, provided are a base wireless communication terminal, including: a transceiver configured to transmit and receive a wireless signal; and a processor configured to control an operation of the transceiver, wherein the processor selects an access category for transmitting a trigger frame which solicits an uplink multi-user transmission, performs a backoff procedure for transmitting the trigger frame based on the selected access category, and transmits the trigger frame when a backoff counter of the backoff procedure expires and a wireless communication method using the same. ## Claims ### Claim 1 A wireless communication terminal comprising: a transceiver; and a processor, wherein the processor is configured to, perform a first backoff procedure for a transmission of a wireless frame, wherein the first backoff procedure is performed within a contention window for the transmission of the wireless frame, and transmit the wireless frame to one or more terminals based on the first backoff procedure, wherein the transmission of the wireless frame is determined to be successful when at least one response frame is received in response to the wireless frame from at least one among the one or more terminals, wherein the transmission of the wireless frame is determined to fail when all of response frames are not received in response to the wireless frame from all of the one or more terminals, and wherein a size of the contention window is increased based on a minimum contention window size and a maximum contention window size according to an access category when the transmission of the wireless frame is determined to fail. ### Claim 2 (depends on 1) The wireless communication terminal of claim 1, wherein the first backoff procedure for the transmission of the wireless frame is performed using a first backoff counter selected within the contention window. ### Claim 3 (depends on 1) The wireless communication terminal of claim 1, wherein the processor is further configured to: retransmit the wireless frame when the transmission of the wireless frame is determined to fail, wherein a retransmission of the wireless frame is performed based on a second backoff procedure. ### Claim 4 (depends on 3) The wireless communication terminal of claim 3, wherein the second backoff procedure is performed using a second backoff counter selected within the increased contention window. ### Claim 5 (depends on 1) The wireless communication terminal of claim 1, wherein the wireless frame is transmitted with data. ### Claim 6 (depends on 5) The wireless communication terminal of claim 5, wherein the access category is a primary access category for the data. ### Claim 7 A wireless communication method of a wireless communication terminal, the method comprising: performing a first backoff procedure for a transmission of a wireless frame, wherein the first backoff procedure is performed within a contention window for the transmission of the wireless frame; and transmitting the wireless frame to one or more terminals based on the first backoff procedure; wherein the transmission of the wireless frame is determined to be successful when at least one response frame is received in response to the wireless frame from at least one among the one or more terminals, wherein the transmission of the wireless frame is determined to fail when all of response frames are not received in response to the wireless frame from all of the one or more terminals, and wherein a size of the contention window is increased based on a minimum contention window size and a maximum contention window size according to an access category when the transmission of the wireless frame is determined to fail. ### Claim 8 (depends on 7) The wireless communication method of claim 7, wherein the first backoff procedure for the transmission of the wireless frame is performed using a first backoff counter selected within the contention window. ### Claim 9 (depends on 7) The wireless communication method of claim 7, the method further comprising: retransmitting the wireless frame when the transmission of the wireless frame is determined to fail, wherein a retransmission of the wireless frame is performed based on a second backoff procedure. ### Claim 10 (depends on 9) The wireless communication method of claim 9, wherein the second backoff procedure is performed using a second backoff counter selected within the increased contention window. ### Claim 11 (depends on 7) The wireless communication method of claim 7, wherein the wireless frame is transmitted with data. ### Claim 12 (depends on 11) The wireless communication method of claim 11, wherein the access category is a primary access category for the data. ### Claim 13 A wireless communication terminal comprising: a transceiver; and a processor, wherein the processor is configured to, receive a wireless frame via a first backoff procedure, wherein the first backoff procedure is performed within a contention window for a transmission of the wireless frame, and wherein the wireless frame is transmitted to one or more terminals, and transmit a response frame in response to the wireless frame, wherein the transmission of the wireless frame is determined to be successful when at least one response frame is received in response to the wireless frame from at least one among the one or more terminals, wherein the transmission of the wireless frame is determined to fail when all of response frames are not received in response to the wireless frame from all of the one or more terminals, and wherein a size of the contention window is increased based on a minimum contention window size and a maximum contention window size according to an access category when the transmission of the wireless frame is determined to fail.