Access Point Clock Recovery via Controller Timestamp Comparison
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Solution Overview
Problem
Wireless access points (APs) with abnormal clocks, such as running 2.5 times slower than controllers, can cause packet transmission failures and connectivity issues, as the controller is unaware of the discrepancy, requiring manual detection and recovery which is inconvenient for in-field deployment.
Innovation Solution
A method where a processor in the AP detects the time difference between its system clock and the controller's system clock through multiple synchronization procedures, determines if an abnormal clock is present, and automatically recovers the AP's system clock if necessary, while reporting the issue to the controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual detection and recovery methods are used for abnormal clocks in APs, then the complexity of the system is reduced, but the ease of operation and productivity deteriorate due to requiring manual intervention
Solution Approach 1:
The AP automatically detects its own clock abnormality by comparing timestamps with the controller and performs self-recovery by resetting its clock, eliminating the need for manual intervention. The system enables itself to monitor and correct clock issues independently through automated time synchronization procedures.
Solution Approach 2:
The system implements a feedback mechanism where the AP continuously monitors time differences with the controller, compares timestamps from multiple synchronization procedures, detects abnormalities when thresholds are exceeded, and triggers recovery actions based on this feedback loop.
2Productivity
If automated detection and recovery mechanisms are implemented, then the ease of operation and productivity improve, but the device complexity increases due to additional monitoring and comparison functions
Solution Approach 1:
The automated system performs self-diagnosis and self-recovery of clock abnormalities, improving productivity by eliminating manual intervention. The AP independently executes time synchronization, detects abnormalities, and recovers without external assistance.
Solution Approach 2:
The system performs multiple time synchronization procedures and compares timestamps to detect abnormalities, using a threshold-based approach that balances detection accuracy with computational resources. The recovery mechanism activates only when abnormalities are confirmed, avoiding unnecessary operations.
3Reliability
If no automated recovery is implemented, then the device complexity remains low, but the reliability deteriorates due to undetected clock abnormalities affecting network connectivity
Solution Approach 1:
The system continuously monitors time synchronization status and detects clock abnormalities through feedback from timestamp comparisons. When the time difference exceeds the threshold, the system triggers automatic recovery to maintain network reliability.
Solution Approach 2:
The AP autonomously detects and recovers from clock abnormalities, ensuring continuous reliable operation without manual intervention. The self-service mechanism maintains network connectivity by automatically correcting time synchronization issues.
4Loss of time
If manual intervention is required for clock recovery, then the device complexity is low, but the loss of time increases due to manual detection and recovery processes
Solution Approach 1:
The system performs preliminary time synchronization procedures to establish baseline timestamps before detecting abnormalities. By pre-configuring synchronization intervals and thresholds, the system can quickly detect and respond to clock issues without manual intervention, reducing time loss.
Solution Approach 2:
The automated detection and recovery system eliminates the time required for manual intervention by performing self-diagnosis and self-recovery. The AP independently identifies clock abnormalities and executes recovery actions, significantly reducing the time loss associated with manual processes.
Data Source
AI summary
An example device comprising: a processor to detect a time difference between a first system clock of an access point (AP) and a second system clock of a controller; determine whether the AP has abnormal dock based on the time difference; and automatically recover the first system clock of the AP when the AP has abnormal clock.