Broadcast Time Synchronization Algorithm for Wireless Sensor Networks
نویسندگان
چکیده
We proposed a time synchronization algorithm based on packet exchange mechanism for wireless sensor networks. A single-hop synchronization scheme was presented where piggyback technique and the least-squares linear regression technique were employed. Multi-hop synchronization scheme consists of topology construction algorithm, single-hop synchronization scheme and time transformation algorithm. Topology construction algorithm constructs a breadth-first spanning-tree. Single-hop synchronization scheme is employed on every single-hop area of the spanning-tree, and time transformation algorithm is to relate the time of nodes in different single-hop area. Simulation results indicate that in an 8-hop network where every node has 8 neighbor nodes, the single hop synchronization error is about 61.86 microseconds on Mica2. Average synchronization error increases linearly at the rate of 19.2 microseconds for one additional hop. To synchronize a multi-hop network, 2n packets are needed in one synchronization cycle where n is the number of non-leaf node in the spanning tree.
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