# US 11,122,621 B2 · Method for transmitting and receiving data over secondary channel in wireless LAN system and apparatus therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,122,621 B2 - Document ID: US11122621B2 - Status: Granted - Kind: B2 - Application number: 16/629,025 - Filed: 2018-07-06 - Published: 2020-06-25 - Granted: 2021-09-14 - Earliest claimed: 2017-07-06 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Sungjin Park; Jinmin Kim; Sunwoong Yun; Jinsoo Choi - Web page: https://patentgrep.com/patent/US11122621B2 ## CPC - H04W 74/006: {in the downlink, i.e. towards the terminal} - H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA] - H04W 28/082: among bearers or channels - H04W 28/0908: {based on time, e.g. for a critical period only} - H04W 40/244: {using a network of reference devices, e.g. beaconing} - H04W 72/27: between access points - H04W 84/12: WLAN [Wireless Local Area Networks] - 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 specification presents a method for transmitting and receiving data of a station over a secondary channel in a wireless LAN (WLAN) system and an apparatus therefor. Particularly, the present invention may comprise the steps of: receiving, from an access point (AP), allocation information on the secondary channel of the wireless LAN system and information on the secondary channel; performing a channel sensing (CS) mechanism by using an interframe space (IFS) determined on the basis of the information on the secondary channel during an allocation interval in the secondary channel, wherein the allocation interval is indicated by the allocation information; and transmitting, to a second STA, data during the allocation interval from the point in time at which it is determined, according to the performed CS mechanism, that the secondary channel is in an idle state. ## Claims ### Claim 1 A method of transmitting, by a first station (STA), data to a second STA in a wireless local area network (WLAN) system, the method comprising: receiving allocation information on a secondary channel of the WLAN system and information on the secondary channel from an access point (AP); performing a channel sensing (CS) mechanism based on an interframe space (IFS) determined based on the information on the secondary channel within an allocation period on the secondary channel, wherein the allocation period is indicated based on the allocation information; and transmitting the data to the second STA during the allocation period from a time when it is determined based on the performed CS mechanism that the secondary channel is an idle state, wherein the allocation information on the secondary channel and the information on the secondary channel are received on a primary channel of the WLAN system. ### Claim 2 (depends on 1) The method of claim 1, wherein the allocation information on the secondary channel and the information on the secondary channel are transmitted within a beacon header interval (BHI) or a data transmission interval (DTI) on the primary channel. ### Claim 3 (depends on 1) The method of claim 1, wherein the transmitting, by the first STA, the data to the second STA comprises: transmitting, by the first STA, the data to the second STA after a lapse of a predetermined length of a backoff time from the time when it is determined by the performed CS mechanism that the secondary channel is in the idle state, and wherein the predetermined length of the backoff time is determined based on the information on the secondary channel. ### Claim 4 (depends on 3) The method of claim 3, wherein the information on the secondary channel includes information on whether the secondary channel is busy during the allocation period indicated based on the allocation information. ### Claim 5 (depends on 4) The method of claim 4, wherein the IFS used in the CS mechanism and the predetermined length of the backoff time are configured differently depending on the information on whether the secondary channel is busy. ### Claim 6 (depends on 5) The method of claim 5, wherein based on the information on the secondary channel indicating that the secondary channel is busy during the allocation period indicated based on the allocation information, the IFS used in the CS mechanism is set to an arbitration IFS (AIFS) per category for the data. ### Claim 7 (depends on 5) The method of claim 5, wherein based on the information on the secondary channel indicating that the secondary channel is not busy during the allocation period indicated based on the allocation information, the IFS used in the CS mechanism is set to a distributed coordination function IFS (DIFS). ### Claim 8 (depends on 5) The method of claim 5, wherein the predetermined length of the backoff time is reduced based on the information on the secondary channel indicating that the secondary channel is not busy during the allocation period indicated based on the allocation information, compared to the information on the secondary channel indicating that the secondary channel is busy during the allocation period indicated based on the allocation information. ### Claim 9 (depends on 1) The method of claim 1, wherein the CS mechanism includes a physical CS mechanism based on the IFS determined based on the information on the secondary channel and a virtual CS mechanism based on a network allocation vector (NAV) timer having a predetermined size. ### Claim 10 A method of receiving, by a first station (STA), data from a second STA in a wireless local area network (WLAN) system, the method comprising: receiving allocation information on a secondary channel of the WLAN system and information on the secondary channel from an access point (AP); performing a channel sensing (CS) mechanism based on an interframe space (IFS) determined based on the information on the secondary channel within an allocation period on the secondary channel, wherein the allocation period is indicated based on the allocation information; and receiving the data from the second STA during the allocation period from a time when it is determined based on the performed CS mechanism that the secondary channel is an idle state, wherein the allocation information on the secondary channel and the information on the secondary channel are received on a primary channel of the WLAN system. ### Claim 11 A station (STA) device for transmitting data in a wireless local area network (WLAN) system, the STA device comprising: a transceiver configured to exchange signals with one or more other STA devices with at least one radio frequency (RF) chain; and a processor connected to the transceiver and configured to process the signals exchanged with the one or more other STA devices, wherein the processor is configured to: receive allocation information on a secondary channel of the WLAN system and information on the secondary channel from an access point (AP); perform a channel sensing (CS) mechanism based on an interframe space (IFS) determined based on the information on the secondary channel within an allocation period on the secondary channel, wherein the allocation period is indicated based on the allocation information; and transmit the data to a second STA during the allocation period from a time when it is determined based on the performed CS mechanism that the secondary channel is an idle state, wherein the allocation information on the secondary channel and the information on the secondary channel are received on a primary channel of the WLAN system. ### Claim 12 A station (STA) device for receiving data in a wireless local area network (WLAN) system, the STA device comprising: a transceiver configured to exchange signals with one or more other STA devices with at least one radio frequency (RF) chain; and a processor connected to the transceiver and configured to process the signals exchanged with the one or more other STA devices, wherein the processor is configured to: receive allocation information on a secondary channel of the WLAN system and information on the secondary channel from an access point (AP); perform a channel sensing (CS) mechanism based on an interframe space (IFS) determined based on the information on the secondary channel within an allocation period on the secondary channel, wherein the allocation period is indicated based on the allocation information; and receive the data from a second STA during the allocation period from a time when it is determined based on the performed CS mechanism that the secondary channel is an idle state, wherein the allocation information on the secondary channel and the information on the secondary channel are received on a primary channel of the WLAN system.