Abstract: Considering the new feature of wireless sensor network applying to the overhead transmission line monitoring in topology and network traffic,a hybrid MAC protocol was proposed. The protocol adopts X-MAC during idle period and pipelined transmission during busy period. It uses different X-MAC parameters according to node's role to improve real-time performance and pipelined transmission to resolve the hidden terminal problem. Simulation results show that the protocol can meet the network's requirement of real-time and energy efficient.

Key words: Wireless sensor networks,Overhead transmission line monitoring,MAC protocol