Impacts of channel selection on industrial wireless sensor-actuator networks
Impacts of channel selection on industrial wireless sensor-actuator networks
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DOI：
10.1109/infocom.2017.8057049
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发表时间：
2017-05
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影响因子：
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通讯作者：
Dolvara Gunatilaka;M. Sha;Chenyang Lu
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文献类型：
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作者：
Dolvara Gunatilaka;M. Sha;Chenyang Lu
工业自动化已经成为无线传感器-执行器网络（WSAN）的一个重要应用。为了满足工业应用的严格可靠性要求，诸如WirelessHART的工业标准采用时隙信道跳频（TSCH）作为其MAC协议。由于每个链路都通过TSCH中使用的所有信道进行跳变，因此确保可靠性的直接策略是仅当链路在所使用的所有信道中可靠时才将其保留在网络拓扑中。然而，这项政策有着令人惊讶的副作用。虽然使用更多的信道可以由于信道分集而增强可靠性，但是更多的信道也可以减少网络拓扑中的链路和路由分集的数量。我们实证分析的影响，信道选择的网络拓扑结构，路由和调度上的52个节点的WSAN测试床。我们观察到固有的权衡信道多样性和路由多样性的信道选择，其中使用过多的信道可能会产生负面影响路由和调度。我们提出了新的信道和链路选择策略，以提高路由多样性和网络的可扩展性。两个不同的测试平台上的实验结果表明，我们的算法可以大大提高工业WSAN的路由和调度。
Industrial automation has emerged as an important application of wireless sensor-actuator networks (WSANs). To meet stringent reliability requirements of industrial applications, industrial standards such as WirelessHART adopt Time Slotted Channel Hopping (TSCH) as its MAC protocol. Since every link hops through all the channels used in TSCH, a straightforward policy to ensure reliability is to retain a link in the network topology only if it is reliable in all channels used. However, this policy has surprising side effects. While using more channels may enhance reliability due to channel diversity, more channels may also reduce the number of links and route diversity in the network topology. We empirically analyze the impact of channel selection on network topology, routing, and scheduling on a 52-node WSAN testbed. We observe inherent tradeoff between channel diversity and route diversity in channel selection, where using an excessive number of channels may negatively impact routing and scheduling. We propose novel channel and link selection strategies to improve route diversity and network schedulability. Experimental results on two different testbeds show that our algorithms can drastically improve routing and scheduling of industrial WSANs.