不确定传播时延下的水声网络保护间隔设定

Underwater Acoustic Sensor Network’s Guard Time Setting with Uncertain Propagation Delay Considerations

摘要:

水下声波的传播时延及波动远大于无线电波，许多借鉴陆地无线电波通信网络原理设计的水声传感器网络协议未能充分考虑和利用水声传播及其时延变化特性.据此给出了时分多址协议中相继传输数据包的冲突模型，分析了保护间隔与簇头节点和传感器节点距离之间的关系，并给出了保护间隔的设置方法.理论分析和仿真表明，提出的保护间隔设定方法改善了传统保护间隔设置偏向保守的缺点，可有效提升水声传感器网络的性能和效率.

Abstract:

Compared with terrestrial radio waves, the underwater acoustic wave propagation is pretty slow and varies more greatly. A lot of current medium access control (MAC) protocol designings for underwater acoustic sensor networks are borrowed from the mature terrestrial networks and have not deeply considered the underwater acoustic propagation characteristics. Such characteristics and proposes a collision model of two consecutive packets in continuous time allocation case in time division multiple access (TDMA) protocols were considered. Then the relationship of the guard time and the distance between the cluster head node and the sensor nodes was analyzed. And finally a guard time settings policy was suggested based on this relationship. Theoretical analysis and simulations show that this approach can improve the conservative traditional guard time settings and can effectively improve the performance and efficiency of underwater acoustic sensor networks.