Routing recommendations for low-latency 802.15.4 control networks

Conference: ARCS 2011 - 24th International Conference on Architecture of Computing Systems
02/22/2011 - 02/23/2011 at Como, Italy

Proceedings: ARCS 2011

Pages: 6Language: englishTyp: PDF

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Holtman, Koen (Philips Applied Technologies, Eindhoven, The Netherlands)
Stok, Peter van der (Philips Research, Eindhoven, The Netherlands)

In many applications of wireless control networks, the latency of message delivery is an important consideration. Typically, in a lighting control network where a light switch sends a wireless message to a lamp, a worst case end-to-end latency of 200 ms or better is desired, so that the working of the switch feels 'immediate' to the end user. Based on a detailed study of the latency performance of a test network located in a real-life office environment, this paper recommends that several key elements are included in a routing system designed to optimize worst case latency. In particular, it is recommended that each node maintains a list of multiple target routers that it can use to deliver a message, and that the node quickly switches to another target router if a delivery acknowledgement from the preferred router is not received. It is also shown that battery powered sensor nodes can use a fast re-try strategy to optimize latency, without great impact on their battery lifetime.