Method of accessing channel in wireless local area network system

• US 9,918,339 B2
• Filed: 09/07/2016
• Issued: 03/13/2018
• 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:
  US15/258,824
• Publication Number:
  US 20160381705A1
• Time in Patent Office: 552 Days
• Field of Search: None
• 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 for channel access by a terminal in a wireless local area network, the method comprising:

receiving, from an access point, a beacon frame including Traffic Indication Map (TIM) information and information assigning channel access windows, wherein the channel access windows include a first type channel access window and a second type channel access window, one of the first type channel access window and the second type channel access window is assigned as a trigger frame channel access window, and the information assigning channel access windows includes information indicating a duration of the trigger frame channel access window corresponding to N*T, where N is a number of slots in the trigger frame channel access window and T is a duration of a slot;

transmitting, to the access point, a trigger frame in a slot allocated to the terminal within the trigger frame channel access window, the slot allocated to the terminal being determined based on the TIM information; and

receiving, from the access point, in response to the trigger frame, an acknowledgement (ACK) frame including information indicating that a data transmission period starts for the terminal after a certain time.

2. The method according to claim 1, wherein the 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 slot allocated to the terminal is configured within the duration of the trigger frame channel access window.

4. The method according to claim 1, wherein receiving the ACK frame further comprises receiving the ACK frame within the slot allocated to the terminal.

5. The method according to claim 1, further comprising receiving a data frame from the access point in the data transmission period.

6. A method for supporting channel access of a terminal by an access point in a wireless local area network, the method comprising:

transmitting a beacon frame including Traffic Indication Map (TIM) information and information assigning channel access windows, wherein the channel access windows include a first type channel access window and a second type channel access window, one of the first type channel access window and the second type channel access window is assigned as a trigger frame channel access window, and the information assigning channel access windows includes information indicating a duration of the trigger frame channel access window corresponding to N*T, where N is a number of slots in the trigger frame channel access window and T is a duration of a slot;

receiving a trigger frame from the terminal in a slot allocated to the terminal within the trigger frame channel access window, the slot allocated to the terminal being determined based on the TIM information; and

transmitting, to the terminal, in response to the trigger frame, an acknowledgement (ACK) frame including information indicating that a data transmission period starts for the terminal after a certain time.

7. A terminal for performing channel access, the terminal comprising:

a transceiver; and

a processor,

wherein the processor is configured to;

receive, from an access point, a beacon frame including Traffic Indication Map (TIM) information and information assigning channel access windows, wherein the channel access windows include a first type channel access window and a second type channel access window, one of the first type channel access window and the second type channel access window is assigned as a trigger frame channel access window, and the information assigning channel access windows includes information indicating a duration of the trigger frame channel access window corresponding to N*T, where N is a number of slots in the trigger frame channel access window and T is a duration of a slot;

transmit, to the access point, a trigger frame in a slot allocated to the terminal within the trigger frame channel access window, the slot allocated to the terminal being determined based on the TIM information; and

receive, from the access point, in response to the trigger frame, an acknowledgement (ACK) frame including information indicating that a data transmission period starts for the terminal after a certain time.

8. An access point for supporting channel access of a terminal, the access point comprising:

a transceiver; and

a processor,

wherein the processor is configured to;

transmit a beacon frame including Traffic Indication Map (TIM) information and information assigning channel access windows, wherein the channel access windows include a first type channel access window and a second type channel access window, one of the first type channel access window and the second type channel access window is assigned as a trigger frame channel access window, and the information assigning channel access windows includes information indicating a duration of the trigger frame channel access window corresponding to N*T, where N is a number of slots in the trigger frame channel access window and T is a duration of a slot;

receive a trigger frame from the terminal in a slot allocated to the terminal within the trigger frame channel access window, the slot allocated to the terminal being determined based on the TIM information; and

transmit, to the terminal, in response to the trigger frame, an acknowledgement (ACK) frame including information indicating that a data transmission period starts for the terminal after a certain time.