Dynamic Multi-User Channel Access to Reduce Power-Save Latency
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Solution Overview
Problem
In wireless networks, power-saving stations (STAs) may fail to win medium access contention due to long contention windows set by access points (APs), leading to network latency and deadlocks, especially when STAs enter power-save mode before the contention window expires, preventing them from receiving trigger frames and transmitting uplink data.
Innovation Solution
Access points dynamically adjust multi-user channel access parameters based on the power-save behaviors of STAs, such as average frequency of data transmission and duration in power-save mode, to increase the likelihood of STAs being awake to receive trigger frames and transmit data, thereby reducing network latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If access points set long contention windows for medium access contention, then collision avoidance is improved, but power-saving stations may enter power-save mode before the contention window expires, causing them to miss trigger frames and increasing network latency
Solution Approach 1:
The access point dynamically adjusts the contention window size based on the power-save behavior of stations. By monitoring whether stations enter power-save mode during contention windows, the AP adapts the window size to be long enough to avoid collisions but short enough to ensure stations remain awake to receive trigger frames, thus resolving the contradiction between collision avoidance and network latency
Solution Approach 2:
The system implements feedback mechanisms where the access point monitors station behavior (whether they enter power-save mode during contention) and uses this information to adjust contention window parameters. This closed-loop control allows the system to optimize both collision avoidance and latency by continuously adapting to actual network conditions and station power-management patterns
2Ease of operation
If access points use random channel access mechanisms with carrier sense multiple access, then medium access control is improved, but power-saving stations contend unsuccessfully and fail to transmit uplink data, causing transmission deadlocks
Solution Approach 1:
The invention changes the parameters of the channel access mechanism specifically for power-saving stations. By adjusting contention window sizes and trigger frame timing based on station power-save behavior, the system modifies the random access parameters to ensure stations wake up at appropriate times to receive triggers and transmit data, thereby maintaining ease of operation while improving transmission efficiency and avoiding deadlocks
Data Source
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Figure 3A~3B
AI summary
This disclosure provides systems, methods, and apparatus, including computer programs encoded on computer storage media, for wireless communication. In some implementations, a wireless communication device obtains one or more indications that a wireless station (STA) will enter a power-save mode, selects, for each respective STA of a plurality of STAs, a duration associated with the respective STA entering the power-save mode, and adjusts one or more parameters of a multi-user channel access mechanism for transmitting uplink data associated with the selected duration. In some other implementations, a wireless communication device outputs one or more indications that the device will enter a power-save mode, outputs or obtains data at each of a plurality of first instances, enters the power-save mode at each of a plurality of second instances, and obtains a beacon indicating one or more parameters to be used for a multi-user channel access mechanism for transmitting uplink data.