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介绍基于定向天线的MAC协议,阐述使用定向天线所面临的隐藏终端、暴露终端以及聋结点问题。重点分析定向天线的MAC协议造成隐藏终端和暴露终端的原因以及解决这些问题相应的策略,在此基础上提出了新的改进CSMA协议。通过仿真表明,改进CSMA协议能提高基于定向天线Ad Hoc网路的整体性能。
The MAC protocol based on directional antenna is introduced, and the hidden terminal, exposed terminal and deaf node are faced with directional antenna. The paper mainly analyzes the reason of hidden terminal and exposed terminal caused by MAC protocol of directional antenna and the corresponding strategy to solve these problems. On this basis, a new improved CSMA protocol is proposed. Simulation shows that the improved CSMA protocol can improve the overall performance of Ad Hoc network based on directional antenna.