STA Grouping for Wireless LAN Channel Access
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Solution Overview
Problem
In wireless LAN systems operating at frequencies below 1GHz, the increased number of associated STAs leads to inefficiencies in the Traffic Indication Map (TIM) protocol and channel access operations, particularly in power save mode, necessitating a method to efficiently manage channel access for a large number of stations.
Innovation Solution
A station grouping-based data transceiving method is introduced, where STAs are grouped based on association identifiers (AIDs) to optimize channel access periods, allowing each STA group or sub-group to exchange data during assigned periods, thereby reducing overhead and improving power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of STAs associated with the AP is increased to expand service coverage, then the coverage area is improved, but the TIM protocol efficiency deteriorates and channel access operations become inefficient
Solution Approach 1:
The patent divides the large number of STAs into multiple groups based on their AID values. Each STA group is assigned a specific channel access period within the beacon interval, allowing grouped STAs to access the channel simultaneously during their designated period. This segmentation resolves the contradiction by maintaining efficient channel access despite the large total number of STAs.
2Area of stationary object
If the number of STAs associated with the AP is increased to expand service coverage, then the coverage area is improved, but the channel access operation efficiency deteriorates
Solution Approach 1:
The channel access period is segmented into multiple sub-periods, each assigned to a specific STA group. This allows STAs to access the channel in an organized manner during their group's designated sub-period, reducing the time loss associated with random or sequential access attempts in a large STA environment.
Solution Approach 2:
STAs are pre-grouped based on their AID values before channel access occurs. Each STA knows its group assignment and the corresponding channel access period in advance, allowing it to wake up and access the channel at the predetermined time without unnecessary waiting or contention, thus reducing channel access time loss.
3Use of energy by moving object
If STAs operate in power save mode with individual channel access, then power consumption is reduced for each STA, but overall system efficiency deteriorates due to TIM protocol overhead
Solution Approach 1:
The patent merges multiple STAs into groups that share the same channel access period. Instead of individually managing channel access and TIM notifications for each STA, the system combines STAs with similar AID ranges into groups, reducing TIM protocol overhead and improving overall system efficiency while allowing each STA to maintain its power save operation.
Data Source
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AI summary
Provided is a method for transceiving data in a wireless LAN system on the basis of a station (STA). The method comprises: receiving an allocation for an association ID (AID) by associating with an access point (AP); and exchanging data with the AP during the channel access period for an STA group comprising the STA. The STA group is grouped on the basis of the AID.