Understanding Precision Time Protocol in Today's Wi-Fi Networks: A Measurement Study
summary
The talk examines Precision Time Protocol (PTP) over Wi‑Fi by measuring both software PTP (running in system/network stacks) and hardware PTP approaches. It identifies causes of software PTP errors, shows that tuning system settings plus an online calibration can let off‑the‑shelf Wi‑Fi devices reach reasonable accuracy, and presents a method to emulate a PTP hardware timestamper using the Wi‑Fi TSF counter; tests report both approaches can hit about 1 µs accuracy.
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chapters (11)
- 0:00Intro
- 1:08PTP over Wi-Fi ?
- 2:41PTP Overview
- 3:48PTP Implementation
- 4:22Software PTP - Timestamp Errors
- 5:37Software PTP - Error Source 1
- 8:16Software PTP - Performance
- 8:45Hardware PTP - Overview
- 11:36Hardware PTP - Performance
- 12:09Hardware PTP - Implementation
- 12:21Conclusion
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