Abstract-In this paper we present the effects of Wi-Fi interference on a Wireless Sensor Network (WSN) in an aircraft. We use Time-Slotted Channel Hopping (IEEE 802.15.4e) as Link layer in the WSN network. We conduct measurements in an environment realistically representing an aircraft cabin. We provide the resulting application failure and packet drop rates with and without interference, for an exemplary deadline critical application. In order to outline the importance of hopping against interference in a controlled environment, we compare the results of individual channels, full channel hopping and clear channel hopping, where the TSCH only hops over channels free from WiFi interference. Results open further discussions for more sophisticated Link layer implementations resulting in increased reliability such as optimization of frequency allocation depending on the application deadline.
Abstract-The paper presents an indoor testbed evaluation of a multi-hop IEEE 802.15.4e Time Slotted Channel Hopping (TSCH) sensor network, operating in 2.4 GHz band. First goal of the evaluation is to assess the perspectives of TSCH, as a more reliable version of IEEE 802.15.4, for meter reading applications in a Smart Grid. Secondly, we compare the network performance for two medium access schemes: contention-based and contention-free. We model two automatic meter reading applications, representing regular metering readings and alarm reporting. With this model, we have collected eight measurement data sets for different interference and load conditions. Based on the data sets, link-and end-to-end reliability, and end-to-end delay are analyzed. Our results point out that the delay constraints can be satisfied. However, channel hopping is insufficient for meeting the reliability requirements, and additional mechanisms to couple with high link-layer losses are required.
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