传感器网络中高能效可靠通信的跨层优化策略

Cross-layer Strategy of Energy-efficient Reliable Communication in Wireless Sensor Networks

低能耗/高可靠通信问题是传感器网络应用中的一个重要研究课题,即如何在满足应用所设定的端到端可靠性要求的前提下实现能耗最小化,在物理层引入功率控制的策略,逐渐增加发送功率,直至满足可靠要求,从而降低不必要的能耗;在数据链路层提出了一种能量高效的组确认数据重传机制,尽量降低数据重传过程中冗余信息.并在此基础上,提出一种跨层联合优化算法,以解决低能耗/高可靠通信问题.最后通过NS-2仿真实验证明了该算法能够满足传感器网络低能耗/高可靠的应用需要。

Low energy cost/high reliability is an important problem in application of wireless sensor networks, viz. how to achieve the lowest energy cost under the constraint of ensuring end-to-end reliability. On the physical layer, power control strategy was utilized, which could reduce unnecessary energy cost through increasing transmitting power gradually until satisfying reliability; And on the data-link layer, an energy efficient Group-based acknowledgement retransmission mechanism was brought forward to reduce redundant data during the process of retransmission. Then, according to these, a cross-layer optimization algorithm was brought forward to solve the problem of low energy cost/high reliability. Finally, performance of the algorithm was tested on the platform of NS-2, which proves that the algorithm can satisfy the application requirement of low energy cost/high reliability in wireless sensor networks.