AID Reassignment Synchronization in Wireless LAN Systems
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Solution Overview
Problem
In WLAN systems, changing association IDs (AIDs) can lead to collisions when reassigned simultaneously across multiple stations due to differing listen intervals and wake-up times, causing inefficiencies and increased power consumption.
Innovation Solution
A method involving the generation and transmission of an AID reassignment frame with a counter value that dictates when the AID change occurs after a specified number of beacon intervals, considering the longest listen interval among stations to synchronize the change and prevent collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If AIDs are reassigned simultaneously to multiple stations, then the reassignment process is efficient and quick, but AID collisions occur due to different listen intervals and wake-up times
Solution Approach 1:
The access point determines the longest listen interval among all stations before reassigning AIDs, and sets the reassignment time based on this pre-calculated value. This preliminary determination ensures that all stations will be awake and ready to receive their new AIDs simultaneously, preventing collisions while maintaining efficient bulk reassignment
Solution Approach 2:
The system uses listen interval information from each station as feedback to determine the optimal reassignment time. By collecting and analyzing the listen interval parameters of all stations, the access point can calculate the appropriate beacon interval offset that ensures all stations are awake for AID reception, thus coordinating the reassignment process effectively
2Reliability
If AID reassignment is delayed to accommodate all stations' listen intervals, then AID collisions are prevented, but the reassignment process takes longer and network efficiency decreases
Solution Approach 1:
The system changes the timing parameter of AID reassignment based on the listen interval characteristics of stations. By dynamically adjusting the reassignment time offset according to the determined longest listen interval, the system ensures reliable AID delivery without requiring excessive delays, thus maintaining network efficiency while preventing collisions
Data Source
AI summary
Disclosed is a method for changing an AID in a wireless LAN system. The method for changing an AID of a terminal by an access point comprises: a step of receiving an AID reassignment frame from the access point; a step of extracting an AID reassignment counter value from the AID reassignment frame; and a step of changing the AID of the terminal to the new AID included in the AID reassignment frame after the beacon periods of the access point indicated by the AID reassignment counter value extracted from the AID reassignment frame reception time have elapsed. Thus, a conflict between AIDs can be prevented.