Method and apparatus for accessing channel in WLAN system

• US 9,756,660 B2
• Filed: 09/27/2016
• Issued: 09/05/2017
• Est. Priority Date: 04/28/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Seok, Yongho
• Primary Examiner(s): Zaidi, Iqbal
• Application Number:
  US15/277,520
• Publication Number:
  US 20170019920A1
• Time in Patent Office: 343 Days
• Field of Search: 370311-347
• CPC Class Codes: H04W 4/08 User group management
• CPC Class Codes: H04W 40/244 using a network of reference devices, e.g. beaconing
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/30 Resource management for broadcast services
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal
• CPC Class Codes: H04W 74/04 Scheduled access hybrid access H04W74/02
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

The present invention relates to a wireless communication system, and more specifically, disclosed are a method and an apparatus for accessing a channel in a WLAN system. The method for accessing a channel from a station (STA) in a wireless communication system, according to one embodiment of the present invention, comprises the steps of: receiving from an access point (AP) a first frame including a traffic indication map (TIM) and a restricted access window (RAW) parameter set component; determining a RAW in which channel access of the STA is permitted, on the basis of the RAW parameter set (RPS) component; and transmitting a second frame to the AP from within the RAW that is determined, wherein the RPS component includes at least one RAW allocation field, and each of the at least one RAW allocation fields can include a RAW group field, a RAW starting point field, and a RAW duration field.

Claims

1. A method for supporting channel access of a station (STA) by an access point (AP) in a wireless communication system, comprising:

transmitting, to the STA, a first frame containing a restricted access window (RAW) parameter set element indicating a RAW allowing channel access of the STA;

receiving, from the STA, a second frame within the indicated RAW,

wherein the RAW is divided into one or more slots,

wherein the RPS element comprises at least one RAW assignment field,

wherein each of the at least one RAW assignment field comprises information on a RAW start time, information on a cross slot boundary and information on a slot duration,

wherein the information on cross slot boundary indicates whether or not crossing a slot boundary is allowed for transmission of the STA.

2. The method according to claim 1, wherein each of the at least one RAW assignment field further comprises information on RAW group indicating whether or not the STA belongs to a group.

3. The method according to claim 1, wherein a value of the slot duration is common for the slots included in the RAW.

4. The method according to claim 1, wherein a duration of the RAW corresponds to a product of the slot duration and a number of the slots included in the RAW.

5. The method according to claim 1, wherein the first frame is a beacon frame, the second frame is a power save (PS)-Poll frame or a trigger frame, and the second frame is transmitted within the RAW based on enhanced distributed channel access (EDCA).

6. A access point (AP) supporting channel access of a station (STA) in a wireless communication system, comprising:

a transceiver; and

a processor that controls the transceiver to;

transmit, to the STA, a first frame containing a restricted access window (RAW) parameter set element indicating a RAW allowing channel access of the STA;

receive, from the STA, a second frame within the indicated RAW,

wherein the RAW is divided into one or more slots,

wherein the RPS element comprises at least one RAW assignment field,

wherein each of the at least one RAW assignment field comprises information on a RAW start time, information on a cross slot boundary and information on a slot duration,

wherein the information on cross slot boundary indicates whether or not crossing a slot boundary is allowed for transmission of the STA.

7. The AP according to claim 6, wherein each of the at least one RAW assignment field further comprises information on RAW group indicating whether or not the STA belongs to a group.

8. The AP according to claim 6, wherein a value of the slot duration is common for the slots included in the RAW.

9. The AP according to claim 6, wherein a duration of the RAW corresponds to a product of the slot duration and a number of the slots included in the RAW.

10. The AP according to claim 6, wherein the first frame is a beacon frame, the second frame is a power save (PS)-Poll frame or a trigger frame, and the second frame is transmitted within the RAW based on enhanced distributed channel access (EDCA).

11. A method for performing channel access by a station (STA) in a wireless communication system, comprising:

receiving, from an access point (AP), a first frame containing a restricted access window (RAW) parameter set element indicating a RAW allowing channel access of the STA;

transmitting, to the AP, a second frame within the indicated RAW,

wherein the RAW is divided into one or more slots,

wherein the RPS element comprises at least one RAW assignment field,

wherein each of the at least one RAW assignment field comprises information on a RAW start time, information on a cross slot boundary and information on a slot duration,

wherein the information on cross slot boundary indicates whether or not crossing a slot boundary is allowed for transmission of the STA.

12. The method according to claim 11, wherein each of the at least one RAW assignment field further comprises information on RAW group indicating whether or not the STA belongs to a group.

13. The method according to claim 11, wherein a value of the slot duration is common for the slots included in the RAW.

14. The method according to claim 11, wherein a duration of the RAW corresponds to a product of the slot duration and a number of the slots included in the RAW.

15. The method according to claim 11, wherein the first frame is a beacon frame, the second frame is a power save (PS)-Poll frame or a trigger frame, and the second frame is transmitted within the RAW based on enhanced distributed channel access (EDCA).

16. A station (STA) in a wireless communication system, comprising:

a transceiver; and

a processor that controls the transceiver to;

receive, from an access point (AP), a first frame containing a restricted access window (RAW) parameter set element indicating a RAW allowing channel access of the STA;

transmit, to the AP, a second frame within the indicated RAW,

wherein the RAW is divided into one or more slots,

wherein the RPS element comprises at least one RAW assignment field,

wherein each of the at least one RAW assignment field comprises information on a RAW start time, information on a cross slot boundary and information on a slot duration,

wherein the information on cross slot boundary indicates whether or not crossing a slot boundary is allowed for transmission of the STA.

17. The STA according to claim 16, wherein each of the at least one RAW assignment field further comprises information on RAW group indicating whether or not the STA belongs to a group.

18. The STA according to claim 16, wherein a value of the slot duration is common for the slots included in the RAW.

19. The STA according to claim 16, wherein a duration of the RAW corresponds to a product of the slot duration and a number of the slots included in the RAW.

20. The STA according to claim 16, wherein the first frame is a beacon frame, the second frame is a power save (PS)-Poll frame or a trigger frame, and the second frame is transmitted within the RAW based on enhanced distributed channel access (EDCA).