Tuning of IEEE 802.11 MAC for improving real-time in industrial wireless networks
Tuning of IEEE 802.11 MAC for improving real-time in industrial wireless networks
复制标题
调整 IEEE 802.11 MAC 以提高工业无线网络的实时性
DOI：
10.1109/etfa.2012.6489553
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
F. Tramarin
中科院分区：
文献类型：
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作者：
Lucia Seno;S. Vitturi;F. Tramarin
在无线网络工业通信中，在提供实时性保证的同时提高可靠性的问题已经得到了科学文献的广泛讨论。已经进行了一些分析，在实时调度框架中考虑这个问题，将实时传输流和可能的重传建模为一组周期性任务。然而，这些分析是从高层次的角度来处理可调度性问题的，在这种情况下，较低的通信层被建模为一个独特的堆栈，好像它们引入了一定的错误概率，并且没有考虑它们的实际行为。在本文中，我们提出了在低层采用IEEE 802.11g WLAN的情况下属于流的数据包传输时间的准确评估。此外，我们解决了无线网络不确定性行为的负面影响，主要是由后退过程和mac层重传引起的，对流集的可行性提供了一些可能的解决方案。
The problem of enhancing reliability while providing real-time guarantees in industrial communication over wireless networks has been widely addressed by the scientific literature. Several analyses have been carried out that consider this problem in a real-time scheduling framework, modeling both real-time transmission flows and possible retransmissions as a set of periodic tasks. These analyses, however, approach the schedulability problem from a high level point of view, where lower communication layers are modeled as if they were a unique stack that introduces a certain error probability and do not take into account their actual behavior. In this paper, we present an accurate evaluation of the transmission times of the packets belonging to the flows in case of an IEEE 802.11g WLAN is employed at the lower layers. Moreover, we address the negative influence of the wireless network non-deterministic behavior, mainly caused by both backoff procedures and MAC-layer retransmissions, on the feasibility of a flow set providing some possible solutions.