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首页> 外文期刊>IEEE Transactions on Parallel and Distributed Systems >An Accurate and Scalable Clock Synchronization Protocol for IEEE 802.11-Based Multihop Ad Hoc Networks
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An Accurate and Scalable Clock Synchronization Protocol for IEEE 802.11-Based Multihop Ad Hoc Networks

机译：一种基于IEEE 802.11的多跳Ad Hoc网络的精确且可扩展的时钟同步协议

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摘要

This paper studies the fundamental problem of clock synchronization in IEEE 802.11-based multihop ad hoc networks. Clock synchronization is important for power saving, network throughput and efficiency of many protocols in an IEEE 802.11-based mobile ad hoc network. The scalability problem of 802.11 timing synchronization has been studied extensively in single hop ad hoc networks and good solutions are available. These solutions, however, do not perform well in a multihop environment. A few multihop solutions for clock synchronization have been proposed recently, but the performances are still not very good. The maximum clock offset is still over 200 µs for these protocols. This paper proposes an adaptive protocol through beacon transmission prioritization, frequency adjustment and construction of dominating set. The frequency adjustment is proved to be bounded. Simulation studies show that the proposed protocol is able to limit the maximum clock offset to under 50u00026;#956;s after protocol stabilization. The improvement is more than 400% over the current solutions. The proposed protocol also shows great long-term stability, and it handles mobility very well.
机译：本文研究了基于IEEE 802.11的多跳ad hoc网络中时钟同步的基本问题。时钟同步对于基于IEEE 802.11的移动自组织网络中的省电，网络吞吐量和许多协议的效率非常重要。 802.11定时同步的可伸缩性问题已经在单跳自组织网络中进行了广泛的研究，并且可以找到好的解决方案。但是，这些解决方案在多跳环境中效果不佳。最近已经提出了一些用于时钟同步的多跳解决方案，但是性能仍然不是很好。对于这些协议，最大时钟偏移仍超过200 µs。通过信标传输优先级，频率调整和控制集的构建，提出了一种自适应协议。证明频率调整是有界的。仿真研究表明，该协议能够在协议稳定后将最大时钟偏移量限制在50u00026;＃956; s以下。与当前解决方案相比，改进幅度超过400％。所提出的协议还显示出很高的长期稳定性，并且很好地处理了移动性。

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