Wireless Receiver Beacon Frame Power Management
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Solution Overview
Problem
In congested wireless local area networks, wireless stations experience unnecessary power consumption due to delayed beacon frames caused by network congestion or interference, leading to inefficient power-saving protocols.
Innovation Solution
A wireless receiver that powers down during most of the beacon frame except for the TIM field, using a preamble detector and processor to selectively power up only during necessary intervals, such as the TIM field, to reduce power consumption by enabling the receiver for as little as 1% of the beacon frame duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiver remains powered up throughout the beacon interval to receive the beacon frame, then the station can reliably receive packets, but power consumption increases significantly
Solution Approach 1:
The beacon frame reception process is segmented into multiple time intervals, and the receiver is powered up only during specific segments (preamble detection interval and TIM field interval) rather than continuously. This allows the receiver to miss non-critical fields while capturing essential information, thereby reducing power consumption while maintaining packet reception reliability.
Solution Approach 2:
Instead of receiving the complete beacon frame, the receiver performs partial reception by focusing only on critical fields (preamble and TIM). This partial action approach reduces the active reception time and power consumption while still providing sufficient information for the station to determine packet availability and respond appropriately.
2Reliability
If the receiver is powered up continuously during the beacon interval, then the station can detect delayed beacon frames, but unnecessary power is consumed during congestion delays
Solution Approach 1:
The receiver operates in a periodic manner, cycling between power-down and power-up states. It powers up periodically to detect the preamble and TIM fields, then powers down for the remainder of the beacon interval. This periodic action allows the receiver to detect delayed beacons when they arrive while minimizing power consumption during periods when no beacon is transmitted due to network congestion.
3Use of energy by moving object
If the receiver powers up only during the TIM field, then power consumption is minimized, but the receiver may miss critical frame information
Solution Approach 1:
The beacon frame is divided into critical and non-critical segments. The receiver powers up during the preamble detection interval to identify the frame structure and then powers up again during the TIM field interval to check for packets. Non-critical fields are skipped, and the receiver relies on the TIM information to determine whether full frame reception is necessary, thus minimizing information loss while reducing power consumption.
Data Source
AI summary
A wireless receiver powers up shortly before the expected arrival of a beacon frame, and upon detection of a beacon frame from an access point the station is associated with and determination of subsequent fields of interest, including at least a TIM field, the receiver powers down. At the previously identified fields of interest, the receiver powers up and uses previously stored values to continue packet demodulation, thereafter examining the TIM field to determine whether the AP has packets to transmit to the station.