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.
Claims11
A method for transmitting, by a first wireless station, feedback information in a wireless local area network (WLAN) system supporting a plurality of frequency resource units, the method comprising the steps of:
- receiving a feedback request field comprising a long training field (LTF) from a second wireless station;
- configuring the feedback information regarding a radio channel for 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 include [−122, −120, −112:4:−4, −2, 2, 4:4:112, 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 include [−122, −100:16:−4, −2, 2, 4:16:100, 122],
- wherein, if the predetermined frequency band is 40 MHz and the predetermined subcarrier grouping number is set as Ng, the predetermined subcarrier indices include [−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 include [−500:Ng:−4, 4:Ng:500];
- and
- transmitting the feedback information to the second wireless station.
A first wireless station for transmitting feedback information in a wireless local area network (WLAN) system supporting a plurality of frequency resource units, 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 the feedback information regarding a radio channel for 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 include [−122, −120, −112:4:−4, −2, 2, 4:4:112, 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 include [−122, −100:16:−4, −2, 2, 4:16:100, 122],
- wherein, if the predetermined frequency band is 40 MHz and the predetermined subcarrier grouping number is set as Ng, the predetermined subcarrier indices include [−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 include [−500:Ng:−4, 4:Ng:500], and
- transmit the feedback information to the second wireless station.
A method for receiving, by a first wireless station, feedback information in a wireless local area network (WLAN) system supporting a plurality of frequency resource units, the method comprising the steps of:
- transmitting a feedback request field comprising a long training field (LTF) from a second wireless station;
- receiving the feedback information regarding a radio channel for 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 include [−122, −120, −112:4:−4, −2, 2, 4:4:112, 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 include [−122, −100:16:−4, −2, 2, 4:16:100, 122],
- wherein, if the predetermined frequency band is 40 MHz and the predetermined subcarrier grouping number is set as Ng, the predetermined subcarrier indices include [−244:Ng:−4, 4:Ng:244], and
- wherein, if the predetermined frequency band is 80 MHz and the predetermined subcarrier grouping number is set as Ng, the predetermined subcarrier indices include [−500:Ng:−4, 4:Ng:500].
Dependencies are inferred from the claim text.