Wireless Client Wake-Up Timing for Beacon Reception Under AP Clock Error
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Battery-powered client devices in wireless networks face challenges in efficiently receiving beacon frames due to inaccuracies in the access point's clock, leading to power wastage and missed connections.
Innovation Solution
A client station adjusts its wake-up times based on estimated inaccuracies in the access point's clock by determining a delta STA-AP time value to optimize the wake-up advance amount, ensuring timely reception of beacon frames while minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the client station enters power-saving mode to conserve battery power, then energy consumption is reduced, but the success rate of beacon frame reception deteriorates due to clock inaccuracies
Solution Approach 1:
The client station performs preliminary actions by measuring the time interval between beacon frames and calculating a wake-up advance amount before actually needing to receive the beacon frame. This allows the station to wake up early enough to compensate for clock inaccuracies while still conserving power during the sleep period.
Solution Approach 2:
The system uses feedback mechanisms where the client station measures actual beacon frame reception timing and compares it with expected timing based on TSF values. This feedback loop allows continuous adjustment of the wake-up advance amount to optimize both power saving and reception reliability.
2Reliability
If the client station wakes up early to compensate for clock inaccuracies, then beacon frame reception reliability is improved, but power consumption increases
Solution Approach 1:
The client station calculates the wake-up advance amount in advance based on measured time intervals and clock offset estimates. This preliminary calculation allows the station to wake up at the optimal moment without excessive early waking, thereby balancing reliability improvement with power consumption control.
Solution Approach 2:
The system dynamically adjusts the wake-up advance amount as a parameter based on measured clock offset values and time intervals. By changing this parameter adaptively, the system optimizes the trade-off between waking up early enough to receive beacons reliably and avoiding unnecessary early wake-ups that would consume extra power.
3Device complexity
If the client station uses fixed wake-up timing, then device complexity is reduced, but beacon frame reception reliability deteriorates due to access point clock variations
Solution Approach 1:
The client station implements a feedback mechanism that continuously measures actual beacon reception timing against expected timing derived from TSF values. This feedback information is used to estimate clock offset and adjust wake-up timing accordingly, maintaining simplicity while improving reliability through adaptive timing.
Solution Approach 2:
The system enables the client station to self-adjust its timing by autonomously measuring time intervals between beacons and calculating appropriate wake-up advance amounts without external intervention. This self-service capability maintains device simplicity while compensating for access point clock variations.
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 optimal wake-up advance amount to compensate for the AP's clock inaccuracy, optimizing client device's wake-up schedules based on the optimal wake-up advance amount for reliable data transmission and minimizing power usage. The client device determines the optimal wake-up advance amount by analyzing beacon frames, identifying differences between the AP's clock and the client station's own clock. Optimizing the wake-up schedules of the client device from a power-saving mode allows the client station to prepare in advance of beacon frame broadcasts, ensuring their consistent reception.