A MAC Protocol with Directional Antennas for Deafness Avoidance in Ad Hoc Networks
A MAC Protocol with Directional Antennas for Deafness Avoidance in Ad Hoc Networks
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DOI：
10.1109/glocom.2007.121
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发表时间：
2007-12
期刊：
影响因子：
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通讯作者：
M. Takata;M. Bandai;Takashi Watanabe
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文献类型：
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作者：
M. Takata;M. Bandai;Takashi Watanabe
定向天线有望在无线自组织网络中提供比全向天线显著的改进。然而，定向MAC协议引入了由方向性引起的新的问题。一个主要问题是耳聋，这是由于缺乏来自邻居节点的状态信息（即，空闲或忙碌）。本文提出了DMAC/DA（Directional MAC with Deafness Avoidance）来克服耳聋问题。在DMAC/DA中，WTS（等待发送）帧由发送器和接收器在成功交换定向RTS（请求发送）和CTS（清除发送）之后发送，以向可能遇到耳聋的潜在发送器通知正在进行的通信。此外，DMAC/DA通过下一个分组通知来增强，以区分发射机和邻居。我们评估我们的协议，通过广泛的模拟研究与不同的参数值，如流量，数据大小和波束宽度。实验结果表明，DMAC/DA协议在吞吐量、RTS失败率和控制开销等方面均优于现有的定向MAC协议DMAC（Directional MAC）和MDA（MAC protocol for Directional TDMA）.
Directional antennas are expected to provide significant improvements over omni-directional antennas in wireless ad hoc networks. Directional MAC protocols, however, introduce new kinds of problems arising from directivity. One major problem is deafness, caused by a lack of state information from neighbor nodes (i.e., idle or busy). This paper proposes DMAC/DA (Directional MAC with Deafness Avoidance) to overcome the deafness problem. In DMAC/DA, WTS (Wait To Send) frames are transmitted by the transmitter and the receiver after the successful exchange of directional RTS (Request To Send) and CTS (Clear To Send) to notify the on-going communication to potential transmitters that may experience deafness. Furthermore, DMAC/DA is enhanced by the next packet notification to distinguish transmitters from neighbors. We evaluate our protocol through extensive simulation study with different values of parameters such as the number of flows, data size and beamwidth. The experimental results show that DMAC/DA outperforms existing directional MAC protocols, such as DMAC (Directional MAC) and MDA (MAC protocol for Directional Antennas), in terms of throughput, RTS failure ratio, and control overhead.