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传感器网络中,电池驱动的传感器节点相互合作共同完成任务,节点的能量一旦耗尽将终止工作。目前传感器网络领域应用最广泛的节能媒体访问层协议S-M AC存在边界节点问题,该问题影响到整个网络的使用寿命。文中对S-M AC协议进行了改进,提出了一种广播方法实现网内节点工作周期同步,解决了边界节点问题。仿真结果表明,改进的S-M AC协议更有利于延长网络寿命。
In the sensor network, the battery-driven sensor nodes cooperate with each other to accomplish the task, and once the node’s energy is exhausted, the work will be terminated. At present, S-M AC, the most widely used energy-saving media access layer protocol in sensor networks, has a boundary node problem, which affects the service life of the entire network. In this paper, the S-M AC protocol is improved. A broadcast method is proposed to synchronize the duty cycle of the nodes in the network and solve the boundary node problem. Simulation results show that the improved S-M AC protocol is more conducive to extend the network life.