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Interference-Resilient Information Exchange

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4 Author(s)
S. Gilbert ; Fed. de Lausanne, Ecole Polytech., Lausanne ; R. Guerraoui ; D. R. Kowalski ; C. Newport

This paper presents an efficient protocol for reliably exchanging information in a single-hop, multi-channel radio network subject to unpredictable interference. We model the interference by an adversary that can simultaneously disrupt up to t of the C available channels. We assume no shared secret keys or third-party infrastructure. The running time of our protocol depends on the gap between C and t: when the number of channels C = Q,(t2), the running time is linear; when only C = t +1 channels are available, the running time is exponential. We prove that exponential-time is unavoidable in the latter case. At the core of our protocol lies a combinatorial function, possibly of independent interest, described for the first time in this paper: the multi-selector. A multi-selector generates a sequence of channel assignments for each device such that every sufficiently large subset of devices is partitioned onto distinct channels by at least one of these assignments.

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19-25 April 2009