Wireless Beacon Reception Timing for AP Clock Compensation
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Solution Overview
Problem
Battery-powered client devices in wireless networks face challenges in consistently receiving beacon frames due to inaccuracies in the access point's clock, leading to inefficient power consumption and potential frame miss receptions.
Innovation Solution
Client stations determine a reference time interval and STA time interval, calculate a delta STA-AP time value to compensate for the access point's clock inaccuracy, and use this to predict the target beacon transmission time, waking up early enough to receive subsequent frames while minimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the client station wakes up at fixed intervals to receive beacon frames, then the beacon frame reception reliability is improved, but the power consumption increases due to unnecessary wake-ups when the access point's clock is inaccurate
Solution Approach 1:
The system measures the actual time interval between received beacon frames and compares it with the expected beacon interval to detect clock drift. This feedback mechanism allows the client station to dynamically adjust its wake-up timing, waking up only when needed to receive beacon frames, thereby improving reception reliability while reducing unnecessary power consumption from premature or delayed wake-ups.
Solution Approach 2:
The wake-up interval is made dynamic rather than fixed. The client station calculates the actual beacon frame reception time based on measured clock drift and adjusts its wake-up timing accordingly. This dynamic adjustment ensures the client station wakes up at the correct moment to receive beacon frames while avoiding unnecessary wake-ups, resolving the contradiction between reliability and power consumption.
2Reliability
If the client station wakes up earlier to compensate for clock inaccuracy, then the beacon frame reception success rate is improved, but the power consumption increases due to extended wake-up duration
Solution Approach 1:
The client station performs preliminary measurement of the beacon interval by receiving initial beacon frames and calculating the actual time interval. Based on this preliminary action, it determines the appropriate wake-up time offset, ensuring it wakes up just in time to receive the next beacon frame without waking up too early, thus improving reception success rate while minimizing wake-up duration and power loss.
Data Source
AI summary
A system and method are provided for improving success rate of beacon frame reception from an access point (AP) in wireless networks by determining an STA wake-up time to compensate for inaccuracy in the STA's clock, optimizing client device's wake-up schedules for reliable data transmission and minimizing power usage. The client device determines the optimal STA wake-up time by analyzing beacon frames, identifying differences between the STA's clock and a reference time. Optimizing the wake-up schedules of the STA from a power-saving mode allows the STA to prepare in advance of beacon frame broadcasts, ensuring their consistent reception.