Abstract
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) |
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Pages (from-to) | 1276-1280 |
Number of pages | 5 |
Journal | Conference Record - Asilomar Conference on Signals, Systems and Computers |
Volume | 1 |
State | Published - 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 |