中文摘要：

TDMA是基于固定分配的MAC协议,网络中不需要控制信息就能避免节点间出现的数据碰撞问题,是一种简单而成熟的信道分配机制。由于水下传感器网络的高延时和网络传输的易干扰性,使得水下传感器网络信道的传输效率较低。文中提出一种新型的水下无线传感器网络数据发送传输协议（M-TDMA）,解决传统TDMA协议水下信道利用率不高的问题。同时还对网络进行拓扑扩展,拓展了网络的实际应用范围,以及制定了可行的网络时钟同步机制。仿真实验表明,该协议能有效提高水下信道的利用率,具有更好的性能。

英文摘要：

TDM A is the MAC protocol based on a fixed allocation,the network can avoid data collision problems without control information,which is a simple and sophisticated channel allocation mechanism. Due to the high latency for underw ater sensor network and the interference for network transmission,the transmission efficiency of the underw ater sensor network channel is low. In this paper,present a new type of network data transmission protocol of the underw ater wireless sensor,called M-TDM A,having solved the problem that the traditional TDM A protocol＇s underw ater channel utilization rate is not high. In addition,it also extends the application scope of the network topology and has made a feasible network clock synchronization mechanism. The simulation experiments show that the protocol can effectively improve the utilization rate of the underw ater channel with its better performance.