定向传输水声通信网络介质访问控制协议

针对水声通信网络吞吐量低、通信隐蔽性差、隐藏终端等问题,提出一种定向传输水声通信网络介质访问控制(Medium Access Control,MAC)协议。协议中各节点采用定向模式传输数据,不需要邻节点位置等先验信息。通过发送节点顺序连续发送传输请求(Request To Send,RTS)信号、维护邻节点相对位置信息表及定向虚拟载波监测等技术实现网络高效无碰撞运行。本协议可有效解决水声通信网络中存在的由非对称增益导致的隐藏终端问题,增加网络覆盖范围,提高通信隐蔽性。仿真结果表明,所提MAC协议能够显著提高水声通信网络吞吐量性能。 

A medium access control protocol for underwater acoustic communication networks with directional antennas

Considering the problem of low throughput,bad communication invisibility and hidden terminal problem in underwater acoustic communication networks,a Medium Access Control (MAC) protocol for underwater acoustic communication networks with directional antennas is presented.In this protocol,nodes send and receive data using directional mode,they could communicate with each other without any prior information about the location of its neighbor nodes.The networks could run in high efficiency in a collisionless way through constantly and sequential transmitting Request To Send (RTS) signal,maintaining the table of neighboring relative location information and directionally virtually carrier detection.Additionally,this protocol also effectively solves the hidden terminal problems due to asymmetry in gain in the networks,expand the coverage of network significantly,and improve communication invisibility.The simulation results show that the proposed MAC protocol increases the throughput of underwater acoustic communication networks significantly.