一种用于水声通信网的全动态TDMA协议

为了解决一定应用场合下水声通信网的通信效率和能量节省之间的矛盾,针对特定的网络拓扑结构,提出了一种全动态时隙调度的时分多址MAC协议FD-TDMA.该协议采用了动态往返调度方式、混合回复策略和保守的睡眠机制,网络各节点根据本节点及相邻节点的收发情况和已知的网络拓扑信息,动态并实时地更新自己在接收状态、睡眠状态和等待状态停留的时间,适时地进入自己的发送时隙.通过OPNET仿真表明:FD-TDMA协议与同样带有睡眠和混合回复机制的固定时隙TDMA协议相比,通信效率和能量效用均有显著的提高；并且该协议性能稳定,能适应不同的业务负载和网络规模.

A fully dynamic TDMA protocol for underwater acoustic networks

In order to solve the contradiction between communication efficiency and energy saving in underwater acoustic sensor network under certain applications,a fully dynamic scheduling TDMA(time division multiple access) scheme aimed at the specific network topology is proposed,which is called FD-TDMA(fully dynamic TDMA).It employs a dynamic round-trip scheduling method,a hybrid ACK(acknowledgement) strategy and the conservative sleeping mechanism.According to the local and neighboring nodes’ sending and receiving situation and the known topology information,each node in the network dynamically and real-timely updates its stay durations in the receiving,sleeping and waiting states,and enters its transmission slot at the right time.Simulation in OPNET platform shows that FD-TDMA can achieve significantly higher communication efficiency and energy utility than the fixed-slot TDMA with the fixed sleeping mechanism and hybrid ACK mode.In addition,the FD-TDMA protocol is of stable performance and adequate for different traffic loads and network sizes.