Reliable co-existence of 802.15.4e TSCH-based WSN and Wi-Fi in an aircraft cabin

Abstract

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.

Reliable hopping sequence design for highly interfered wireless sensor networks

“…In our previous work [12], we noticed from experimental results that interfered channels are not fully blocked, and non-interfered channels are affected by small, but not negligible, packet drops. This consideration naturally raised the following questions: What is the capacity of interfered channels?…”

“…In the previous work [12], we measured the packet drop probability of WSN channels with high interference. Interestingly, we observed that interfered channels were not fully blocked by interference, and non-interfered channels were affected by small, but not negligible, packet drops.…”

“…We assume that, even though the channel loss probabilities vary, the condition P [12]. The threshold α is the channel quality separation criterion, and accommodates small channel variations.…”

“…Furthermore, we define the number of transmission opportunities N D , the amount of TSCH resource blocks available within the deadline. In our previous work [12] we have shown that, in order to guarantee a fair allocation of white channels, each combination of transmission opportunities from the hopping sequence should have the same amount of white channels.…”

Time Slotted Channel Hopping for smart metering: Measurements and analysis of medium access

“…In [11], [12], reliability aspects of TSCH have been examined in a single hop scenario. In contrast to them, we consider a multi hop network, and study both delay and reliability.…”