Method for indicating channel access type in wireless communication system, and apparatus therefor

Patent metadata

Field	Value
Publication number	US-2016353378-A1
Application number	US-201615237382-A
Country	US
Kind code	A1
Filing date	Aug 15, 2016
Priority date	Jun 27, 2012
Publication date	Dec 1, 2016
Grant date	—

Abstract

Disclosed is a method for a station (STA) for accessing a channel in a wireless communication system. The method for a STA for accessing a channel in a wireless communication system comprises the steps of: receiving a beacon frame comprising a traffic indicator map (TIM); and transmitting a power save (PS)-Poll frame if buffered traffic is indicated by TIM to the STA, wherein the PS-Poll frame is transmitted during a PS-Poll dedicated restricted access window (RAW) by and/or during an additional RAW, the PS-Poll dedicated RAW being allocated to transmit the PS-Poll frame, and the additional RAW being additionally allocated subsequent to the PS-Poll-dedicated RAW.

First claim

1 - 20 . (canceled)

21 . A method of performing channel access, which is performed by a station (STA) in a wireless communication system, the method comprising:
receiving a beacon frame containing a TIM (traffic indication map) from an Access Point (AP); and transmitting a PS-Poll (Power Save-Poll) frame when the TIM indicates that traffic for the STA is buffered, wherein the PS-Poll frame is transmitted during a PS-Poll dedicated RAW (restricted access window) accessible for a specific page group including the STA, wherein each STAs included in the specific page group is allowed to send the PS-Poll frame to the AP during the PS-Poll dedicated RAW, wherein the STA does not receive a data frame during the PS-Poll dedicated RAW, and wherein at least one EDCA parameter used for transmitting the PS-Poll frame is equivalent to an EDCA parameter used for transmitting audio traffic.

22 . The method of claim 21 , wherein the STA receives the data frame after the end of the PS-Poll dedicated RAW.

23 . The method of claim 21 , wherein the EDCA parameter comprises at least one selected from the group consisting of CWmin (minimum Contention Window), CWmax (maximum Contention Window) and AIFSN (Arbitration Inter-Frame Spacing Number).

24 . The method of claim 21 , wherein the STA receives a data frame during a second RAW additionally assigned behind after the PS-Poll dedicated RAW.

25 . The method of claim 21 , wherein when the PS-Poll frame is not transmitted during the PS-Poll dedicated RAW, the STA transmits the PS-poll frame during a RAW additionally assigned behind after the PS-Poll dedicated RAW.

26 . The method of claim 25 , wherein when the STA fails to transmit the PS-Poll frame during the PS-Poll dedicated RAW or is unable to receive an ACK (acknowledgement) frame in response to the PS-Poll despite transmitting the PS-Poll frame during the PS-Poll dedicated RAW, the STA determines that the PS-Poll frame was transmitted unsuccessfully during the PS-Poll dedicated RAW.

27 . The method of claim 25 , wherein after transmitting the PS-Poll frame successfully, the STA receives a UTA (UL transmission allowance) frame from an Access Point (AP) indicating that the channel access is allowed during the RAW additionally assigned behind after the PS-Poll dedicated RAW.

28 . The method of claim 21 , wherein when the TIM does not indicate that traffic is buffered for the STA or the STA successfully transmits the PS-Poll frame during the PS-Poll dedicated RAW, the method further comprises:
receiving, at the STA, a UTA (UL transmission allowance) frame during a RAW additionally assigned behind after the PS-Poll dedicated RAW, and attempting the channel access during the RAW additionally assigned behind after the PS-Poll dedicated RAW.

29 . A method of performing a channel access, which is supported by an AP (access point) in a wireless communication system, the method comprising:
transmitting, to a STA, a beacon frame containing a TIM (traffic indication map), wherein the TIM indicates that traffic for the STA is buffered; and receiving a PS-Poll (Power Save-Poll) frame from the STA receiving an indication of a presence of a buffered traffic the TIM, wherein the PS-Poll frame is received during at a PS-Poll dedicated RAW (restricted access window) accessible for a specific page group including the STA, wherein each STAs included in the specific page group is allowed to send the PS-Poll frame to the AP during the PS-Poll dedicated RAW, wherein the STA does not receive a data frame during the PS-Poll dedicated RAW, and wherein at least one EDCA parameters used for transmitting the PS-Poll frame is equivalent to an EDCA parameter used for transmitting audio traffic.

30 . The method of claim 29 , wherein the EDCA parameter comprises at least one selected from the group consisting of CWmin (minimum Contention Window), CWmax (maximum Contention Window) and AIFSN (Arbitration Inter-Frame Spacing Number).

31 . The method of claim 29 , wherein the AP transmits a data frame during a RAW additionally assigned behind after the PS-Poll dedicated RAW.

32 . The method of claim 29 , wherein when the PS-Poll frame is not be received during the PS-Poll dedicated RAW, the AP receives the PS-poll frame during a RAW additionally assigned behind after the PS-Poll dedicated RAW.

33 . The method of claim 29 , wherein the AP transmits a UTA (UL transmission allowance) frame indicating that the channel access of the STA is allowed during a RAW additionally assigned behind after the PS-Poll dedicated RAW.

34 . The method of claim 33 , wherein the UTA frame is transmitted while a channel is idle over a prescribed time during the RAW additionally assigned behind after the PS-Poll dedicated RAW.

35 . The method of claim 33 , wherein the UTA frame is transmitted to the paged STA by unicast or multicast.

36 . The method of claim 33 , wherein the UTA frame is transmitted by broadcast.

37 . In a station (STA) device configured to perform a channel access in a wireless communication system, an apparatus comprising:
a transceiver configured to transceive that transmits and receives a radio signal; a processor configured to control the transceiver; wherein the processor is further configured to: receive a beacon frame containing a TIM (traffic indication map) from an AP (access point), and transmit a PS-Poll (Power Save-Poll) frame to the AP when the TIM indicates that traffic is buffered, wherein the PS-Poll frame is transmitted during a PS-Poll dedicated RAW (restricted access window) accessible for a specific page group including the STA, wherein each STAs included in the specific page group is allowed to send the PS-Poll frame to the AP during the PS-Poll dedicated RAW, wherein the STA does not receive a data frame during the PS-Poll dedicated RAW, and wherein at least one EDCA parameter used for transmitting the PS-Poll frame is equivalent to an EDCA parameter used for transmitting audio traffic.

38 . In an AP (access point) device configured to support a channel access in a wireless communication system, an apparatus comprising:
a transceiver configured to transceive that transmits and receives a radio signal; a processor configured to control the transceiver: wherein the processor is further configured to: transmit, to an STA, a beacon frame containing a TIM (traffic indication map), wherein the TIM indicates that traffic for the STA is buffered, and receive a PS-Poll frame from an STA receiving an indication of a buffered traffic by the TIM, wherein the PS-Poll frame is received during a PS-Poll dedicated RAW (restricted access window) accessible for a specific page group including the STA, wherein each STAs included in the specific page group is allowed to send the PS-Poll frame to the AP during the PS-Poll dedicated RAW, wherein the STA does not receive a data frame during the PS-Poll dedicated RAW, and wherein at least one EDCA parameter used for transmitting the PS-Poll frame is equivalent to an EDCA parameter used for transmitting audio traffic.

Assignees

• Lg Electronics Inc

Inventors

• Kim Jeongki
• Seok Yongho
• Kwak Jinsam
• Choi Jinsoo

Classifications

• H04W84/12

  WLAN [Wireless Local Area Networks] · CPC title

• H04W52/0216 Primary

  using a pre-established activity schedule, e.g. traffic indication frame · CPC title

• H04W74/008

  Electricity · mapped topic

• H04W74/06 Primary

  using polling · CPC title

• H04W74/002

  Transmission of channel access control information · CPC title