Method and device for transmitting feedback frame in wireless lan system
AssigneeLG Electronics Inc.
InventorsEunsung PARK, Jinyoung CHUN, Jinsoo CHOI, Dongguk LIM, Hangyu CHO
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Abstract
Provided are a method and a device for transmitting a feedback frame in a wireless LAN system. Particularly, a first wireless station receives, from a second wireless station, a feedback request field including an LTF. The first wireless station configures feedback information on a wireless channel corresponding to a preset frequency band by using the feedback request field. The first wireless station transmits the feedback information to the second wireless station.
Claims10
A method performed by a first wireless station of a wireless local area network, WLAN, system supporting a plurality of frequency resource units corresponding to different frequencies, the method comprising the steps of:
- receiving a feedback request field comprising a long training field, LTF, from a second wireless station;
- configuring feedback information regarding a radio channel corresponding to a predetermined frequency band based on the feedback request field,
- wherein the feedback information comprises channel status information about a predetermined subcarrier index,
- wherein the predetermined subcarrier index is determined based on a predetermined subcarrier grouping number,
- wherein, if the predetermined frequency band is 20 MHz and the predetermined subcarrier grouping number is set to 4, the predetermined subcarrier indices are set to [−122, −120:4:−4, −2, 2, 4:4:120, 122],
- wherein, if the predetermined frequency band is 20 MHz and the predetermined subcarrier grouping number is set to 16, the predetermined subcarrier indices are set to [−122, −116:16:−4, −2, 2, 4:16:116, 122],
- wherein, if the predetermined frequency band is 40 MHz and the predetermined subcarrier grouping number is set as Ng, the predetermined subcarrier indices are set to [−244:Ng:−4, 4:Ng:244],
- wherein, if the predetermined frequency band is 80 MHz and the predetermined subcarrier grouping number is set as Ng, the predetermined subcarrier indices are set to [−500:Ng:−4, 4:Ng:500];
- and
- transmitting the feedback information to the second wireless station.
A first wireless station performing communication in a wireless local area network, WLAN, system supporting a plurality of frequency resource units corresponding to different frequencies, the first wireless station comprising:
- a radio frequency RF, unit transmitting and receiving radio signals;
- and
- a processor operatively coupled to the RF unit, wherein the processor is configured to:
- receive a feedback request field comprising a long training field, LTF, from a second wireless station,
- configure feedback information regarding a radio channel corresponding to a predetermined frequency band based on the feedback request field,
- wherein the feedback information comprises channel status information about a predetermined subcarrier index,
- wherein the predetermined subcarrier index is determined based on a predetermined subcarrier grouping number,
- wherein, if the predetermined frequency band is 20 MHz and the predetermined subcarrier grouping number is set to 4, the predetermined subcarrier indices are set to [−122, −120:4:−4, −2, 2, 4:4:120, 122],
- wherein, if the predetermined frequency band is 20 MHz and the predetermined subcarrier grouping number is set to 16, the predetermined subcarrier indices are set to [−122, −116:16:−4, −2, 2, 4:16:116, 122],
- wherein, if the predetermined frequency band is 40 MHz and the predetermined subcarrier grouping number is set as Ng, the predetermined subcarrier indices are set to [−244:Ng:−4, 4:Ng:244],
- wherein, if the predetermined frequency band is 80 MHz and the predetermined subcarrier grouping number is set as Ng, the predetermined subcarrier indices are set to [−500:Ng:−4, 4:Ng:500], and
- transmit transmits the feedback information to the second wireless station.
Dependencies are inferred from the claim text.