Synchronizing clocks in wireless personal area networks

Details Synchronizing clocks in wireless personal area networks Synchronizing clocks in wireless personal area networks

2004-10-01

2008-08-05

Ahn, Sam K (Department: 2611)

Pulse or digital communications

Synchronizers

Reexamination Certificate

active

07409022

ABSTRACT:
A method synchronizes a transmit clock of a transmitter with a receive clock of a receiver in a wireless communications network. Times t1, t2, t3, and t4of the transmit clock corresponding times t1′, t2′, t3′, and t4′ of the receive clock. A synchronization message is generated in a media access control layer of the transmitter at the time t1. The time t1is inserted in the synchronization message when the synchronization message is passed from the media access layer to a physical layer at the time t2. Then, the synchronization message including the time t1is broadcast. The synchronization message is received from the physical layer in the receiver, at which time the time t3′ is obtained. The received message is passed to a media access control layer of the receiver, and the receive clock is adjusted by adding the time t1′−t3′ to the current time of the receive clock.

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