移动水下传感器网络动态TDMA协议

Dynamic TDMA Protocol for Mobile Underwater Sensor Networks

介质访问控制(MAC)问题是水下传感器网络(UWSN)研究的热点问题之一,其协议设计的主要挑战是水下网络的信号传播延迟太高带来冲突的"时空不确定性"现象—来自不同站点的帧是否冲突不仅取决于他们的发送时间,还取决于这两个站点的位置.因此总结了水下MAC协议的最新研究成果,提出了一个基于位图协议的动态水下TDMA协议,适用于节点能够局部运动的动态水下网络.该协议利用水下特殊的"时空不确定性"现象减少信道空闲,提高能量效率和传输效率.最后,通过仿真实验验证了协议的可用性和效率.

MAC problem is one of hot spots in the research of underwater acoustic sensor networks （ UWSN ）. The major challenge of MAC design is long signal propagation delay, which causes the phenomenon of ＂space-time uncertainty＂ --a conflict of two terminals is determined not only by nodes＇ transmission time but also by their positions. Then, the latest research results about this problem are discussed, and the challenges, current research ideas and methods, and development trend in the future are also summarized. Moreo- ver, an adaptive bit-map protocol based TDMA protocol was designed for UWSN with localized mobile nodes to reduce idle time and improve energy efficiency. Finally, this protocol is simulated and compared with other MAC protocols to verify its reliability and per- formance.