Traditional network synchronization assumes perfect physical-layer (PHY) tuning. However, the operating environment of wireless sensor networks is quite challenging to warrant perfect PHY timing. To account for PHY tuning errors, we pursue a joint PHY/network-layer synchronization approach. At the PHY, we adopt a timing synchronization scheme that offers cost-effective wireless ad hoc access. The variance expression of this synchronizer is derived to shed light on its deviation from the ideal timestamps involved in a network timing protocol. This variance also motivates altering the random medium access control to effect a new network-level timing protocol based on Time-Stamp Broadcast Synchronization (TSBS), capable of attaining accurate clock synchronization with low energy consumption. Our design and analysis account for cross-layer issues in synchronizing practical wireless sensor networks.
|Original language||English (US)|
|Number of pages||5|
|Journal||Conference Record - Asilomar Conference on Signals, Systems and Computers|
|State||Published - Dec 1 2004|
|Event||Conference Record of the Thirty-Eighth Asilomar Conference on Signals, Systems and Computers - Pacific Grove, CA, United States|
Duration: Nov 7 2004 → Nov 10 2004