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For efficient learning of access policy and coordinated channel access, fine synchronization of transmission start/end time among wireless node is quite important.
In the IEEE 802.11 WLAN, the allowable jitter of timestamp is us-order because the shortest frame length is several tens of ms.
On the other hand, there is clock drift between any two nodes, and it leads to timestamp error between any two nodes.
The timestamp error will become large time-by-time even if the clock is once synchronized by some protocol such as NTP.
So, a method to compensate for the timestamp error among wireless nodes is necessary. |
IEEE/ICACT20210244 Slide.04
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