MAC protocol in underwater acoustic network decides the ways that nodes share the UWA channel's property. It affects the utilization ratio of the UWA channel. This paper makes modeling and simulation of the data link layer protocol based on OP-NET, compares random access MAC protocol and RTS/CTS approach protocol, and analyzes the performances affected by transmission range of each node, data packet size and network topology. Simulation result shows that comparing to random access protocol, the RTS/CTS approach protocol has the better performances in complex underwater acoustic environment than randan access protocol.%水声网络MAC协议决定了节点共享水声信道资源的方式,它直接影响到水声信道的利用率和网络的整体性能.本文基于OPNET平台,对随机接入型MAC协议和握手协议进行对比,并分析传输范围、网络拓扑结构和数据包的大小等因素对协议性能的影响.仿真结果表明,握手协议在情况复杂的水声环境中的性能优于随机接入协议.
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