Spatial reuse and collision avoidance in ad hoc networks with directional antennas

Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE Pub Date : 2002-11-17 DOI:10.1109/GLOCOM.2002.1188052

Yu Wang, J. Garcia-Luna-Aceves

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引用次数: 62

Abstract

The quest for efficient medium access control (MAC) protocols for multi-hop ad hoc networks has aroused great interest in using directional antennas. Some MAC protocols using directional antennas have been proposed in the past; they trade off spatial reuse and collision avoidance via a combination of omnidirectional and directional transmission modes. It is argued that the benefit of spatial reuse achieved by a MAC protocol that uses a directional mode in all transmissions can outweigh the benefit of a conservative collision avoidance MAC protocol that sends some omni-directional control packets to silence potential interfering nodes. We present detailed simulation experiments of the popular IEEE 802.11 MAC protocol and its variants that make use of a directional transmission mode in sufficiently random networks. It is concluded that, in contention-based MAC protocols for multi-hop networks infested with hidden terminals, the aggressive channel access scheme featured by all-directional transmissions indeed outperforms other conservative schemes in terms of enhanced throughput and reduced delay.

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定向天线自组织网络中的空间复用与碰撞避免

对多跳自组织网络中有效的介质访问控制(MAC)协议的追求引起了人们对定向天线的极大兴趣。过去已经提出了一些使用定向天线的MAC协议;它们通过全向和定向传输模式的结合来权衡空间重用和避免碰撞。有人认为，在所有传输中使用定向模式的MAC协议所实现的空间重用的好处可能超过保守的避免碰撞的MAC协议的好处，后者发送一些全向控制数据包以沉默潜在的干扰节点。我们提出了流行的IEEE 802.11 MAC协议及其变体的详细模拟实验，这些变体在充分随机的网络中使用了定向传输模式。研究结果表明，在存在隐藏终端的多跳网络中，基于争用的MAC协议中，以全向传输为特征的主动信道接入方案在提高吞吐量和降低时延方面确实优于其他保守方案。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE

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