自适应动态功率控制的机会网络节能高效路由算法

An Efficient Energy-Saving Routing Algorithm for Opportunistic Networks with Dynamically Adaptive Power Control

针对机会网络中基于跨层设计的能量高效路由算法(ERBC)存在的未考虑节点运动、部分数据消息传输时能耗偏大、矢量消息交换过程有冗余控制开销的问题,提出一种自适应动态功率控制的节能路由算法(ERAPC)加以解决。ERAPC算法通过拓展确认字符(ACK)帧的使用改进了基于接收信号强度指示值(RSSI)的节点测距机制,将功率控制的范围从部分数据消息扩展到全部,以减少节点能耗;通过等待收发节点尽可能靠近后才传送数据,进一步减小节点能量消耗;通过提出一种更简捷的矢量消息交换新机制,减少网络控制开销。仿真结果表明,与ERBC算法相比,ERAPC算法的比特能耗至少降低了27.27%,控制开销则减小了11.87%以上。

An efficient energy-saving routing algorithm with dynamically adaptive power control （ERAPC） is proposed to address the problems that there exist large energy consumption for transmitting partial data packets, no consideration of node＇s mobility and high control overhead in vector exchange mechanism lying in the energy-efficient routing algorithm based on cross-layer design （ERBC）. The ERAPC extends the usage of acknowledgement （ACK） frames to improve the RSSI-based ranging mechanism, to enlarge the range of power control to all data messages and to reduce nodal energy consumption. Until the sender and the receiver move as close as possible, the data messages are sent out to lower the transmit power further; and an efficient new mechanism of exchanging vectors is presented in ERAPC to decrease the control overhead. Simulation results and comparison with the ERBC algorithm show that the energy consumption of each bit in the ERAPC is reduced by at least 27.27% and the control overhead is reduced by at least 11.87%, respectively.