Towards high accuracy in IEEE 802.11 based clock synchronization using PTP

A. Mahmood, G. Gaderer, H. Trsek, Stefan Schwalowsky, N. Kero
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引用次数: 42

Abstract

The introduction of the precision time protocol has brought forth the possibility to have a standardised synchronization mechanism in networks, independent from the actual communication technology. However, it can be observed, for example in the annexes of the standard, that many implementations focus only on Ethernet based communication. The logical next step is to investigate how this protocol will fare when used for synchronizing clocks in a distributed manner over IEEE 802.11 based devices. The availability of features like roaming, the broadcast nature of the wireless medium and different hardware platform architectures require an investigation on how clock synchronization can be realized in wireless environments. This paper proposes an approach to import the precision time protocol to IEEE 802.11. Furthermore, standard nodes are enhanced with software timestamping, leading to a synchronization accuracy of a few microseconds.
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在基于IEEE 802.11的PTP时钟同步中实现高精度
精确时间协议的引入使得在网络中独立于实际通信技术建立标准化的同步机制成为可能。然而,可以观察到,例如在标准的附件中,许多实现只关注基于以太网的通信。合乎逻辑的下一步是研究当在基于IEEE 802.11的设备上以分布式方式用于同步时钟时,该协议将如何运行。诸如漫游、无线媒体的广播性质和不同硬件平台架构等特性的可用性要求研究如何在无线环境中实现时钟同步。本文提出了一种将精确时间协议引入IEEE 802.11的方法。此外,使用软件时间戳增强了标准节点,从而实现了几微秒的同步精度。
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