Method and terminal for requesting and acquiring information relating to channel access in wireless LAN, and apparatus for providing information relating to channel access in wireless LAN

• US 10,555,336 B2
• Filed: 06/13/2013
• Issued: 02/04/2020
• Est. Priority Date: 06/13/2012
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Kwon, Hyoung Jin, Lee, Jae Seung, Cheong, Min Ho, Yu, Hee Jung, Lee, Sok Kyu
• Primary Examiner(s): Ly, Anh Vu H
• Application Number:
  US14/407,855
• Publication Number:
  US 20150131570A1
• Time in Patent Office: 2,427 Days
• Field of Search: None
• CPC Class Codes: H04W 48/14 using user query or user detection
• CPC Class Codes: H04W 74/002 Transmission of channel access control information

Abstract

Provided are a terminal for requesting and acquiring information associated with a channel access in a wireless local area network (WLAN) and an apparatus for providing information associated with a channel access in a WLAN, and more particularly, the terminal for requesting and acquiring information associated with a channel access in a WLAN according to an example embodiment may verify whether a beacon is received during a predetermined beacon interval, transmit a group and slot information request signal when the beacon is verified not to be received, and receive a group and slot information response signal in response to the group and slot information request signal.

Claims

1. A terminal for communicating in a channel access in a wireless local area network (WLAN), the terminal comprising:

a transmitter to transmit, to an access point (AP), a power save (PS)-poll frame for requesting the AP to reschedule a wakeup timing of the terminal; and

a receiver to receive an acknowledgement (ACK) frame from the AP in response to the PS-poll frame, the ACK frame including information for rescheduling the wakeup timing of the terminal,

wherein the terminal is a non-traffic indication map (non-TIM) station that is not required to listen for traffic indication map (TIM) beacon frames,

wherein the ACK frame is a Target Wake Time ACK (TACK) frame,

wherein the information for rescheduling the wakeup timing of the terminal included in the ACK frame comprises a value associated with a wakeup of the terminal,

wherein the value is associated with a next Target Beacon Transmit Time (TBTT),

wherein the terminal as the non-TIM station wakes up based on the value associated with the next TBTT and listens for a beacon frame including information related to a time,

wherein the terminal as the non-TIM station resynchronizes to the beacon frame based on the value associated with the next TBTT, and

wherein the terminal as the non-TIM station identifies a resource for a channel and accesses the channel based on the resynchronized beacon frame.

2. The terminal of claim 1, wherein the PS-poll frame comprises an identifier indicating a request for information associated with a group identifier (ID) allocated for each restricted access window (RAW), a start time of the RAW, and an RAW duration.

3. The terminal of claim 2, wherein when the terminal is accessible for each slot allocated by the AP, the PS-poll frame comprises an identifier indicating a request for information associated with a slot allocated to the terminal and a duration of the allocated slot.

4. The terminal of claim 1, further comprising:

a processor to be synchronized with the AP based on a timestamp included in the PS-poll frame, and to perform a channel access based on a group ID allocated for each RAW, a start time of the RAW, and an RAW duration included in the PS-poll frame.

5. The terminal of claim 4, wherein the processor performs the channel access based on information associated with a slot allocated to the terminal and the duration of the allocated slot included in the group and slot information response signal.

15. The terminal of claim 1, wherein the information for rescheduling the wakeup timing of the terminal included in the ACK frame comprises a duration field indicating information associated with a wakeup time of the terminal.

6. An access point (AP) for communicating in a wireless local area network (WLAN), the AP comprising:

a receiver to receive, from a terminal, a power save (PS)-poll frame for requesting the AP to reschedule a wakeup timing of the terminal; and

a transmitter to transmit an acknowledgement (ACK) frame to the terminal in response to the PS-poll frame, the ACK frame including information for rescheduling the wakeup timing of the terminal,

wherein the terminal is a non-traffic indication map (non-TIM) station that is not required to listen for traffic indication map (TIM) beacon frames,

wherein the ACK frame is a Target Wake Time ACK (TACK) frame,

wherein the information for rescheduling the wakeup timing of the terminal included in the ACK frame comprises a value associated with a wakeup of the terminal,

wherein the value is associated with a next Target Beacon Transmit Time (TBTT),

wherein the terminal as the non-TIM station wakes up based on the value associated with the next TBTT and listens for a beacon frame including information related to a time,

wherein the terminal as the non-TIM station resynchronizes to the beacon frame based on the value associated with the next TBTT, and

wherein the terminal as the non-TIM station identifies a resource for a channel and accesses the channel based on the resynchronized beacon frame.

7. The AP of claim 6, wherein the PS-poll frame comprises information associated with a group identifier (ID) allocated for each restricted access window (RAW) and an RAW duration.

8. The AP of claim 6, wherein when the terminal is accessible for each slot allocated by the AP, the PS-poll frame comprises an identifier indicating a request for information associated with a slot allocated to the terminal and a duration of the allocated slot.

9. The apparatus of claim 6, further comprising:

a processor to determine a location of a slot using a function mapped in a location of a bit set as “

1”

on a TIM indicating whether data buffered for each terminal exists.

10. The AP of claim 6, wherein the ACK frame comprises information for notifying a subsequent transmission of the group and slot information response signal in response to the PS-poll frame.

11. The AP of claim 10, wherein the ACK frame comprises information associated with a transmission time of the group and slot information response signal.

12. The AP of claim 11, wherein the transmission time is set based on an allocation section of an RAW or an allocation section of a slot.

13. The AP of claim 10, wherein the ACK frame comprises a duration field indicating information associated with a wakeup time of the non-TIM station (STA).

14. The AP of claim 13, wherein a value set in the duration field is used to provide a start time of an allocated slot or a start time of a competitive RAW.

16. The AP of claim 6, wherein the information for rescheduling the wakeup timing of the terminal included in the ACK frame comprises a duration field indicating information associated with a wakeup time of the terminal.