Method for alleviating hidden node problem in WLAN system

• US 10,098,114 B2
• Filed: 06/07/2017
• Issued: 10/09/2018
• Est. Priority Date: 05/10/2013
• Status: Active Grant

• Current Assignee: KT Corporation
• Original Assignee: KT Corporation
• Inventors: Jeong, Yang Seok, Kim, Joo Young
• Primary Examiner(s): PHUNKULH, BOB A
• Application Number:
  US15/616,046
• Publication Number:
  US 20170280450A1
• Time in Patent Office: 489 Days
• Field of Search: None
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• 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 74/0816 with collision avoidance
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

Disclosed is a method for alleviating a hidden node problem in a wireless local area network (WLAN) system. A method for detecting a hidden node comprises the steps of: configuring a first restricted access interval used for a plurality of terminals transmitting a hidden node detection frame; configuring a second restricted access interval used for a plurality of terminals transmitting a hidden node report frame generated on the basis of an HND frame; generating a beacon including configuration information of the first restricted access interval and configuration information of the second restricted access interval; and transmitting the generated beacon. Accordingly, a terminal in a hidden node relation can be detected.

Claims

1. A method for supporting channel access by an access point, the method comprising:

setting a first time window including at least one time slot for allowing each of a first group of stations to access channel in a time slot of the at least one time slot within the first time window;

setting a second time window including at least one time slot for allowing each of a second group of stations to access channel in a time slot of the at least one time slot within the second time window; and

transmitting a beacon frame including setting information of the first time window and the second time window,

wherein at least a portion of the first time window overlaps with at least a portion of the second time window.

2. The method of claim 1,

wherein a start time of the second time window corresponds to a start time of the first time window plus a predetermined time.

3. The method of claim 2,

wherein the predetermined time is greater than a distributed interframe space (DIFS) and less than a length of a time slot.

4. The method of claim 1,

wherein at least a portion of a first time slot of the first time window overlaps with at least a portion of a first time slot of the second time window.

5. The method of claim 1,

wherein the first group of station has higher priority than the second group of stations.

6. A method for channel access by a station, the method comprising:

receiving, from an access point, a beacon frame including setting information of a first time window and a second time window; and

performing channel access based on the setting information,

wherein a first time window includes at least one time slot for allowing each of a first group of stations to access channel in a time slot of the at least one time slot within the first time window,

wherein the second time window includes at least one time slot for allowing each of a second group of stations to access channel in a time slot of the at least one time slot within the second time window, and

wherein at least a portion of the first time window overlaps with at least a portion of the second time window.

7. An access point for supporting channel access, the access point comprising:

a transceiver; and

a processor,

wherein the processor is configured to;

set a first time window including at least one time slot for allowing each of a first group of stations to access channel in a time slot of the at least one time slot within the first time window;

set a second time window including at least one time slot for allowing each of a second group of stations to access channel in a time slot of the at least one time slot within the second time window; and

cause the transceiver to transmit a beacon frame including setting information of the first time window and the second time window,

wherein at least a portion of the first time window overlaps with at least a portion of the second time window.

8. A station for performing channel access, the station comprising:

a transceiver; and

a processor,

wherein the processor is configured to;

cause the transceiver to receive, from an access point, a beacon frame including setting information of a first time window and a second time window; and

cause the transceiver to perform channel access based on the setting information,

wherein a first time window includes at least one time slot for allowing each of a first group of stations to access channel in a time slot of the at least one time slot within the first time window,

wherein the second time window includes at least one time slot for allowing each of a second group of stations to access channel in a time slot of the at least one time slot within the second time window, and

wherein at least a portion of the first time window overlaps with at least a portion of the second time window.