Method of accessing channel in wireless local area network system

• US 9,467,943 B2
• Filed: 06/11/2013
• Issued: 10/11/2016
• Est. Priority Date: 06/13/2012
• Status: Active Grant

• Current Assignee: Red Hat, Inc. (International Business Machines Corporation)
• Original Assignee: KT Corporation
• Inventors: JEONG, Yang Seok, Kim, Joo Young
• Primary Examiner(s): LY, ANH VU H
• Application Number:
  US14/406,583
• Publication Number:
  US 20150245292A1
• Time in Patent Office: 1,218 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04L 1/1685 the supervisory signal being transmitted in response to a specific request, e.g. to a polling signal
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04W 48/10 using broadcasted information
• CPC Class Codes: H04W 52/0222 in packet switched networks
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• 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: H04W 88/02 Terminal devices
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method of accessing a channel in a wireless LAN system is disclosed. A method of accessing a channel in a terminal includes receiving TIM information included in a beacon transmitted by an access point, determining a channel access slot allocated to the terminal based on the TIM information, transmitting a data transmission request to the access point in the channel access slot, and receiving data transmission slot allocation information corresponding to the data transmission request from the access point. Accordingly, a time slot can be prevented from unnecessarily wasting.

Claims

1. A method by a terminal performing a slot-based channel access, the method comprising:

receiving Traffic Indication Map (TIM) information included in a beacon transmitted by an access point;

transmitting, to the access point, a Power Save (PS)-Poll frame or a trigger frame in a channel access slot allocated to the terminal and determined based on the TIM information; and

receiving, from the access point, in response to the PS-Poll frame or the trigger frame, an acknowledgement (ACK) frame including information on a data frame transmission time,

wherein the transmitting the PS-Poll frame or the trigger frame and receiving the ACK frame are performed within the channel access slot.

2. The method according to claim 1, wherein the channel access slot allocated to the terminal is determined based on a position of an association ID (AID) of the terminal included in the TIM information.

3. The method according to claim 1, wherein the channel access slot is configured within a duration restricted for transmitting the PS-Poll frame or the trigger frame of the terminal.

4. The method according to claim 1, further comprising receiving the data frame from the access point at the data frame transmission time.

5. A method by an access point for supporting a slot-based channel access of a terminal, the method comprising:

transmitting a beacon including Traffic Indication Map (TIM) information for the terminal;

receiving a Power Save (PS)-Poll frame or a trigger frame from the terminal in a channel access slot allocated to the terminal and determined based on the TIM information; and

transmitting, to the terminal, in response to the PS-Poll frame or the trigger frame, an acknowledgement (ACK) frame including information on a data frame transmission time,

wherein the receiving the PS-Poll frame or the trigger frame and transmitting the ACK frame are performed within the channel access slot.

6. The method according to claim 5, wherein the channel access slot allocated to the terminal is determined based on a position of an association ID (AID) of the terminal included in the TIM information.

7. The method according to claim 5, wherein the channel access slot is configured within a duration restricted for transmitting the PS-Poll frame or the trigger frame of the terminal.

8. The method according to claim 5, further comprising transmitting data frame to the terminal at the data frame transmission time.

9. A terminal performing a slot-based channel access, the terminal comprising:

a transceiver; and

a processor,

wherein the processor is configured to;

receive, using the transceiver, Traffic Indication Map (TIM) information included in a beacon transmitted by an access point;

transmit, using the transceiver, to the access point, a Power Save (PS)-Poll frame or a trigger frame in a channel access slot allocated to the terminal and determined based on the TIM information; and

receive, using the transceiver, from the access point, in response to the PS-Poll frame or the trigger frame, an acknowledgement (ACK) frame including information on a data frame transmission time, and

wherein the transmitting the PS-Poll frame or the trigger frame and receiving the ACK frame are performed within the channel access slot.

10. An access point for supporting a slot-based channel access of a terminal, the access point comprising:

a transceiver; and

a processor,

wherein the processor is configured to;

transmit, using the transceiver, a beacon including Traffic Indication Map (TIM) information for the terminal;

receive, using the transceiver, a Power Save (PS)-Poll frame or a trigger frame from the terminal in a channel access slot allocated to the terminal and determined based on the TIM information; and

transmit, using the transceiver, to the terminal, in response to the PS-Poll frame or the trigger frame, an acknowledgement (ACK) frame including information on a data frame transmission time,

wherein the receiving the PS-Poll frame or the trigger frame and transmitting the ACK frame are performed within the channel access slot.