Method of controlling channel access
First Claim
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1. A method of controlling a channel access in a wireless local area network (WLAN) system, the method comprising:
- receiving, by the accessing station, a channel access control mode from an access point, the channel access control mode indicating that a station whose association identifier (AID) bit in a traffic indication map (TIM) element is equal to one is only allowed to start contending for a channel access for uplink transmission;
receiving, by the accessing station, the TIM element from the access point, the TIM element including a bitmap, each bit in the bitmap corresponding to an AID of a station,wherein, if the channel access control mode indicates that a station whose AID bit in the TIM element is equal to one is only allowed to start contending for a channel access for uplink transmission, each bit in the bitmap being set to one when a corresponding station is allowed to access a wireless medium at one of a plurality of access periods, the plurality of access periods being defined within one beacon interval;
determining, by the accessing station, an allowed access period from the plurality of access periods when a bit in the bitmap corresponding to the accessing station'"'"'s AID is set to one; and
contending, by the accessing station, the channel access for uplink transmission only during the determined allowed access period.
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Abstract
An embodiment of the present invention provides a method of controlling channel access in a WLAN system, comprising receiving, from an access point, a first channel access control message sent to stations located in some area through a directional antenna of the access point, and attempting to access a channel according to the first channel access control message. The method enables coexistence of several users and improves scalability of a wireless system.
17 Citations
12 Claims
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1. A method of controlling a channel access in a wireless local area network (WLAN) system, the method comprising:
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receiving, by the accessing station, a channel access control mode from an access point, the channel access control mode indicating that a station whose association identifier (AID) bit in a traffic indication map (TIM) element is equal to one is only allowed to start contending for a channel access for uplink transmission; receiving, by the accessing station, the TIM element from the access point, the TIM element including a bitmap, each bit in the bitmap corresponding to an AID of a station, wherein, if the channel access control mode indicates that a station whose AID bit in the TIM element is equal to one is only allowed to start contending for a channel access for uplink transmission, each bit in the bitmap being set to one when a corresponding station is allowed to access a wireless medium at one of a plurality of access periods, the plurality of access periods being defined within one beacon interval; determining, by the accessing station, an allowed access period from the plurality of access periods when a bit in the bitmap corresponding to the accessing station'"'"'s AID is set to one; and contending, by the accessing station, the channel access for uplink transmission only during the determined allowed access period. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A device for wireless local area network system, the device comprising:
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a processor; and a memory operatively coupled with the processor and configured to store instructions that, when executed by the processor, causes to the device to; receive a channel access control mode from an access point, the channel access control mode indicating that a station whose association identifier (AID) bit in a traffic indication map (TIM) element is equal to one is only allowed to start contending for a channel access for uplink transmission; receive the TIM element from the access point, the TIM element including a bitmap, each bit in the bitmap corresponding to an AID of a station, wherein, if the channel access control mode indicates that a station whose AID bit in the TIM element is equal to one is only allowed to start contending for a channel access for uplink transmission, each bit in the bitmap being set to one when a corresponding station is allowed to access a wireless medium at one of a plurality of access periods, the plurality of access periods being defined within one beacon interval; determine an allowed access period from the plurality of access periods when a bit in the bitmap corresponding to the device'"'"'s AID is set to one; and contend the channel access for uplink transmission only during the determined allowed access period. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification