Collision avoidance in single-channel ad hoc networks using directional antennas
Collision avoidance in single-channel ad hoc networks using directional antennas
复制标题
使用定向天线的单通道自组织网络中的冲突避免
DOI：
10.1109/icdcs.2003.1203515
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
J. Garcia
中科院分区：
文献类型：
--
作者：
Yu Wang;J. Garcia
三个冲突避免协议进行了分析，使用全向数据包接收与全向传输，定向传输，或两者的组合。一个简单的模型，介绍了分析这些冲突避免协议在任意拓扑结构的多跳网络的性能。该分析的数值结果表明，使用窄天线波束宽度的所有控制和数据包的传输冲突避免实现了最高的吞吐量之间的三个冲突避免方案考虑。流行的IEEE 802.11 MAC协议及其变体的定向传输和全向分组接收的基础上的仿真实验验证的分析预测的结果。结果进一步表明，窄波束宽度传输也可以减少节点经历的平均延迟。得出的结论是，窄束宽传输所实现的空间重用的优势优于某些控制分组的全向传输所具有的保守冲突避免方案。这是因为后者需要节点与其邻居和隐藏终端进行更严格的协调，这可能导致由于节点的过度等待时间而浪费更多的信道资源。
Three collision-avoidance protocols are analyzed that use omni-directional packet reception together with omni-directional transmissions, directional transmissions, or a combination of both. A simple model is introduced to analyze the performance of these collision avoidance protocols in multi-hop networks with arbitrary topologies. The numerical results of this analysis show that collision avoidance using a narrow antenna beamwidth for the transmission of all control and data packets achieves the highest throughput among the three collision avoidance schemes considered. Simulation experiments of the popular IEEE 802.11 MAC protocol and its variants based on directional transmissions and omni-directional packet reception validate the results predicted in the analysis. The results further show that narrow-beamwidth transmissions can also reduce the average delay experienced by nodes. It is concluded that the advantage of spatial reuse achieved by narrow-beamwidth transmissions outweighs that of conservative collision avoidance schemes featured by the omnidirectional transmission of some control packets. This is due to the fact that the latter requires far more stringent coordination of nodes with their neighbors and hidden terminals, which can lead to much more channel resource wasted due to nodes' excessive waiting time.