基于近邻算法的无线传感器网络功率控制

Power control in wireless sensor network based on nearest-neighbor algorithm

针对因无线传感器网络节点部署的密集性和随机性造成单一、不变的发射功率无法满足无线传感器网络能量高效的要求,提出基于近邻算法的无线传感器网络功率控制算法(NNPC).该算法中Sink节点保存整个网络拓扑结构的信息,利用多近邻算法评估节点密度,确定最优通信距离.结合Friss自由空间模型和两线地面传播模型计算当前网络最优发射功率,Sink节点广播通知节点采用最优发射功率发送数据.如果节点没有接收到广播包,那么节点采用默认的最大发射功率.仿真结果表明,基于近邻算法的网络功率控制算法能提高整个无线传感器网络的生存时间,节省网络的平均能耗.

A single and unchanged transmission power can not meet the requirement of energy efficiency in wireless sensor network because the nodes deployment of wireless sensor network was dense and random.The power control in wireless sensor network based on various nearest-neighbor distances algorithm（NNPC）was proposed in order to solve the problem.Sink node saved the entire network topology information.The node density was measured with various nearest-neighbor distances algorithm,and the optimal communication range was determined.Then the optimal transmission power was calculated with the Friss free space model and the two way propagation model.Finally Sink node broadcasted to inform nodes transmitting data with the optimal transmission power.If nodes didn＇t receive the broadcast packet,the nodes used the default maximum transmission power.Simulation results show that the algorithm can improve the network lifetime and save the network average energy consumption.