Wireless Station Sleep Mode Based on Buffer Depth
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Solution Overview
Problem
Wireless communication systems, such as set-top boxes, face high power consumption due to the need to maintain continuous connectivity for high-bandwidth audio/video streams, which is exacerbated by overhead in the 802.11 specification's power save mode and medium contention mechanisms.
Innovation Solution
Implementing a dynamic sleep mode strategy based on buffer depth thresholds, where the device transitions into sleep mode for varying durations depending on the amount of buffered data, reducing the need for frequent PS-POLL messages and aggregating data packets for efficient transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the device uses 802.11 power save mode with PS-POLL messages to reduce power consumption, then power consumption decreases, but overhead increases significantly
Solution Approach 1:
The system performs preliminary actions by buffering data at the access point before the mobile station needs it. The access point stores data in advance and uses traffic indication maps in beacon frames to notify the mobile station of buffered data, eliminating the need for continuous PS-POLL messaging and reducing overhead while maintaining power savings.
2Productivity
If the device maintains continuous connectivity for high-bandwidth audio/video streams, then data transfer efficiency is improved, but power consumption increases
Solution Approach 1:
The system implements periodic action by having the mobile station wake up at regular beacon intervals to check for buffered data using traffic indication maps, rather than maintaining continuous connectivity. This periodic checking mechanism maintains data transfer efficiency while allowing the device to enter low-power states between beacons, significantly reducing power consumption.
3Loss of time
If the device wakes up frequently to check for data in power save mode, then data freshness is improved, but power consumption increases
Solution Approach 1:
The system uses feedback through traffic indication maps included in beacon frames to inform the mobile station about buffered data availability. The mobile station wakes up periodically, checks the traffic indication map for data freshness information, and only processes data when necessary. This feedback mechanism optimizes the balance between data freshness and power consumption by avoiding unnecessary wake-ups.
Data Source
AI summary
A device implementing the subject wireless communication system may include one or more memories, and one or more processors coupled to the one or more memories. In some aspects, the one or more processors are configured to cause receiving a first frame comprising an indication that the station has data buffered at an access point, determining, in response to the first frame, whether a measured buffer depth exceeds a predetermined threshold, receiving a second frame comprising a predetermined amount of buffered data based on the measured buffer depth, transitioning, after the predetermined amount of buffered data is received, into a sleep mode for a first predetermined duration when the measured buffer depth exceeds the predetermined threshold, and transitioning into the sleep mode for a second predetermined duration less than the first predetermined duration when the measured buffer depth does not exceed the predetermined threshold.