# US 12,225,587 B2 · Wireless communication method and wireless communication terminal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,225,587 B2 - Document ID: US12225587B2 - Status: Granted - Kind: B2 - Application number: 18/375,521 - Filed: 2023-10-01 - Published: 2024-01-25 - Granted: 2025-02-11 - Earliest claimed: 2014-10-22 - 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/US12225587B2 ## CPC - H04W 74/0816: with collision avoidance - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - 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) - 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 Provided is a wireless communication terminal. The wireless communication terminal includes a transceiver configured to transmit/receive a wireless signal and a processor configured to control an operation of the wireless communication terminal. The transceiver receives a MAC frame including information on a plurality of wireless communication terminals that are to receive data from a base wireless communication terminal. The plurality of wireless communication terminals include the wireless communication terminal and receive data from the base wireless communication terminal based on the MAC frame. ## Claims ### Claim 1 A base wireless communication terminal comprising: a transceiver; and a processor, wherein the processor is configured to transmit, by using the transceiver, a Multiple-Request to Send (M-RTS) frame to a plurality of wireless communication terminals, wherein the M-RTS frame is a medium access control (MAC) frame and includes a plurality of channel vector fields, wherein each of the plurality of channel vector fields indicates information on an allocated sub-frequency band which is allocated to a wireless communication terminal corresponding to each of the plurality of channel vector fields among the plurality of wireless communication terminals, and receive a Clear to Send (CTS) frame which is a response to the M-RTS frame from the at least one of the plurality of wireless communication terminals and transmitted through a sub-frequency band allocated to the at least one of the plurality of wireless communication terminals, wherein bits of each of the plurality of channel vector fields are divided into a first one or more bits indicating a location of a channel, among a plurality of channels, which includes the allocated sub-frequency band, and a second one or more bits indicating a location and a size of a sub-channel corresponding to the allocated sub-frequency band within the channel, wherein the sub-channel is included in the channel. ### Claim 2 (depends on 1) The base wireless communication terminal of claim 1, wherein the M-RTS frame includes a plurality of identifiers for identifying each of the plurality of wireless communication terminals. ### Claim 3 (depends on 1) The base wireless communication terminal of claim 1, wherein the first one or more bits indicate index of the channel and the second one or more bits indicate the index of the sub-channel. ### Claim 4 (depends on 1) The base wireless communication terminal of claim 1, wherein the processor is configured to transmit data frames to the plurality of wireless communication terminal when a predetermined time elapses after receiving the CTS frame. ### Claim 5 (depends on 1) The base wireless communication terminal of claim 1, wherein the processor is configured to transmit the M-RTS frame through a frequency band including the primary channel having the minimum unit bandwidth. ### Claim 6 A wireless communication terminal comprising: a transceiver; and a processor, wherein the processor is configured to receive, by using the transceiver, a M-RTS (Multiple-Request to Send) frame from a base wireless communication terminal, wherein the M-RTS frame is a medium access control (MAC) frame and includes a plurality of channel vector fields, wherein each of the plurality of channel vector fields indicates information on an allocated sub-frequency band which is allocated to a wireless communication terminal corresponding to each of the plurality of channel vector fields among a plurality of wireless communication terminals, and transmit a Clear to Send (CTS) frame which is a response to the M-RTS frame to the base wireless communication terminal through a sub-frequency band allocated to the wireless communication terminals, wherein bits of each of the plurality of channel vector fields are divided into a first one or more bits indicating a location of a channel, among a plurality of channels, which includes the allocated sub-frequency band, and a second one or more bits indicating a location and a size of a sub-channel corresponding to the allocated sub-frequency band within the channel, wherein the sub-channel is included in the channel. ### Claim 7 (depends on 6) The wireless communication terminal of claim 6, wherein the M-RTS frame includes a plurality of identifiers for identifying each of the plurality of wireless communication terminals. ### Claim 8 (depends on 6) The wireless communication terminal of claim 6, wherein the first one or more bits indicate index of the channel and the second one or more bits indicate the index of the sub-channel. ### Claim 9 (depends on 6) The wireless communication terminal of claim 6, wherein the processor is configured to receive a data frame from the base wireless communication terminal after transmitting the CTS frame. ### Claim 10 (depends on 6) The wireless communication terminal of claim 6, wherein the processor is configured to receive the M-RTS frame through a frequency band including the primary channel having the minimum unit bandwidth. ### Claim 11 An operation method of a wireless communication terminal comprising: receiving a Multiple-Request to Send (M-RTS) frame from a base wireless communication terminal, wherein the M-RTS frame is a medium access control (MAC) frame and includes a plurality of channel vector fields, wherein each of the plurality of channel vector fields indicates information on an allocated sub-frequency band which is allocated to a wireless communication terminal corresponding to each of the plurality of channel vector fields among a plurality of wireless communication terminals; and transmitting a Clear to Send (CTS) frame which is a response to the M-RTS frame to the base wireless communication terminal through a sub-frequency band allocated to the wireless communication terminals, wherein bits of each of the plurality of channel vector fields are divided into a first one or more bits indicating a location of a channel, among a plurality of channels, which includes the allocated sub-frequency band, and a second one or more bits indicating a location and a size of a sub-channel corresponding to the allocated frequency band within the channel, wherein the sub-channel is included in the channel. ### Claim 12 (depends on 11) The operation method of claim 11, wherein the M-RTS frame includes a plurality of identifiers for identifying each of the plurality of wireless communication terminals. ### Claim 13 (depends on 11) The operation method of claim 11, wherein the first one or more bits indicate index of the channel and the second one or more bits indicate the index of the sub-channel. ### Claim 14 (depends on 11) The operation method of claim 11, further comprising receiving a data frame from the base wireless communication terminal after transmitting the CTS frame. ### Claim 15 (depends on 11) The operation method of claim 11, further comprising receiving the M-RTS frame through a frequency band including the primary channel having the minimum unit bandwidth.