关键词: 无线传感器网路, 低开销, 负载均衡, 网络变化率, 链路可用性, truetime2.0

Abstract: Aiming at the fast change of topology and easy chain congestion, large routing overhead, unbalanced load and short network life cycle in WSN, this paper proposes an improved TORA protocol（TORA-p） with low overhead and load balancing, which automatically adjusts the maximum number of retransmission of OBM packet according to the network rate of change to reduce the number of unnecessary routing maintenance. Meanwhile, it uses link availability as routing metrics by combining MAC layer routing information to automatically balance the network load for achieving the goal of avoiding premature death and disconnection between critical path and nodes. Using the truetime2. 0 platform to set specific simulation environment, the performance of TORA-p is compared and analyzed. The results show that, TORA- p balances the network load, improves the network life cycle, and reduces routing overhead and delay, showing better data transmission capacity.

Key words: Wireless Sensor Network（WSN）, low overhead, load balancing, network rate of change , link availability, truetime2.0