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Method and apparatus for transmitting frame in wireless local area network

專利號
US10165596B2
公開日期
2018-12-25
申請人
LG ELECTRONICS INC.（KR Seoul）
發(fā)明人
Jinsoo Choi; Jinyoung Chun; Wookbong Lee; Dongguk Lim; Hangyu Cho
IPC分類
H04W74/08; H04W52/58; H04L12/26; H04W40/00; H04W52/54; H04W84/12
技術(shù)領(lǐng)域
tpc,sta,ap,bss,cca,frame,sta's,transmit,may,resource
地域： Seoul

摘要

Disclosed is a method and an apparatus for transmitting a frame in a wireless local area network. A method for transmitting a frame in a wireless local area network may comprise the steps of: an STA, operating on the basis of TPC, transmitting a TPC configuration request frame to an AP, the TPC configuration request frame containing information for a TPC STA communication resource requested by the STA; the STA receiving, from the AP, a TPC configuration response frame as a response to the TPC configuration request frame, the TPC configuration response frame containing information for allocating requested TPC STA communication resource; and the STA transmitting the frame to the AP by means of the requested TPC STA communication resource.

說明書

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is the National Stage filing under 35 U.S.C. 371 of International Application No. PCT/KR2015/000019, filed on Jan. 2, 2015, which claims the benefit of U.S. Provisional Application Nos. 61/937,623, filed on Feb. 10, 2014, 61/938,086, filed on Feb. 10, 2014 and 61/969,794, filed on Mar. 24, 2014, the contents of which are all hereby incorporated by reference herein in their entirety.

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to wireless communications, and more particularly, to a method and apparatus for transmitting a frame in a wireless local area network (WLAN).

Related Art

In a wireless local area network (WLAN) system, distributed coordination function (DCF) may be employed as a method enabling a plurality of stations (STAs) to share a wireless medium. DCF is based on a carrier sensing multiple access with collision avoidance (CSMA/CA).

Generally, in operations under a DCF access environment, when a medium is not occupied (that is, idle) for a DCF interframe space (DIFS) interval or longer, an STA may transmit a medium access control (MAC) protocol data unit (MPDU) to be urgently transmitted. When the medium is determined to be occupied according to a carrier sensing mechanism, an STA may determine the size of a contention window (CW) using a random backoff algorithm and perform a backoff procedure. The STA may select a random value in the CW to perform the backoff procedure and determine backoff time based on the selected random value.

權(quán)利要求

1
What is claimed is:1. A method of configuring parameters used for transmitting a physical layer protocol data unit (PPDU) in a wireless local area network (WLAN), the method comprising:configuring, by a station, a clear channel assessment (CCA) threshold based on whether or not the CCA threshold is used for an overlapping basic service set (BSS) of the station, the overlapping BSS being a BSS of the station that has a coverage that overlaps with a coverage of a BSS of another station,wherein the CCA threshold for the overlapping BSS is configured based on a transmit power to be used for the PPDU;performing, by the station, a channel assessment based on the CCA threshold;transmitting, by the station, the PPDU to an Access Point (AP) only when a wireless medium is determined to be idle as a result of the channel assessment,wherein the PPDU comprises a legacy part followed by a high efficient (HE) part,wherein the HE part includes a HE short training field (HE-STF), a HE long training field (HE-LTF), and a data field, andwherein a size of an Inverse Fast Fourier Transform (IFFT) applied by the station to the HE part in an uplink frequency band is four times greater than a size of an IFFT applied by the station to the legacy part in the uplink frequency band.2. The method of claim 1, wherein, when the CCA threshold is used for a BSS of the station that has a coverage that does not overlap with a coverage of any BSS of the another station, the CCA threshold for the target BSS is configured to be a constant value.3. The method of claim 2, wherein the CCA threshold used for the BSS of the station that has the coverage that does not overlap with the coverage of any BSS of the another station is different from the CCA threshold for the overlapping BSS.4. The method of claim 1, wherein, when the CCA threshold is used for the overlapping BSS, and when the transmit power is set to decrease from a previous value of the transmit power, the CCA threshold for the overlapping BSS increases as much as the transmit power decreases.5. A station (STA) configuring parameters used for transmitting a physical layer protocol data unit (PPDU) in a wireless local area network (WLAN), the STA comprising:a radio frequency (RF) unit configured to transmit or receive a radio signal; anda processor operatively coupled to the RF unit,wherein the processor is configured to:configure a clear channel assessment (CCA) threshold based on whether or not the CCA threshold is used for an overlapping basic service set (BSS) of the station, the overlapping BSS being a BSS of the station that has a coverage that overlaps with a coverage of a BSS of another station,wherein the CCA threshold for the overlapping BSS is configured based on a transmit power to be used for the PPDU,perform a channel assessment based on the CCA threshold, andtransmit the PPDU to an Access Point (AP) only when a wireless medium is determined to be idle as a result of the channel assessment,wherein the PPDU comprises a legacy part followed by a high efficient (HE) part,wherein the HE part includes a HE short training field (HE-STF), a HE long training field (HE-LTF), and a data field, andwherein a size of an Inverse Fast Fourier Transform (IFFT) applied to the HE part in an uplink frequency band is four times greater than a size of an IFFT applied to the legacy part in the uplink frequency band.6. The STA of claim 5, wherein, when the CCA threshold is used for a BSS of the station that has a coverage that does not overlap with a coverage of any BSS of the another station, the CCA threshold for the target BSS is configured to be a fixed value.7. The STA of claim 6, wherein the CCA threshold used for the BSS of the station that has the coverage that does not overlap with the coverage of any BSS of the another station is different from the CCA threshold for the overlapping BSS.8. The STA of claim 5, wherein, when the CCA threshold is used for the overlapping BSS, and when the transmit power is set to decrease from a previous value of the transmit power, the CCA threshold for the overlapping BSS increases as much as the transmit power decreases.
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