Consensus in Sparse, Mobile Ad-hoc Networks

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  2. Dr Khaled Alekeish
  3. Dr Paul Ezhilchelvan
Author(s)Ezhilchelvan P; Alekeish K
Publication type Report
Series TitleSchool of Computing Science Technical Report Series
Source Publication DateJuly 2010
Report Number1208
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Consensus is central to several applications including collaborative ones which a wireless ad-hoc network can facilitate for mobile users in terrains with no infrastructure support for communication. We solve the consensus problem in a sparse network in which a node can at times have no other node in its wireless range and useful end-to-end connectivity between nodes can just be a temporary feature that emerges at arbitrary intervals of time for any given node pair. Efficient one-to-many dissemination, essential for consensus, now becomes a challenge: enough number of destinations cannot deliver a multicast unless nodes retain the multicast message for exercising opportunistic forwarding. Seeking to keep storage and bandwidth costs low, we propose two protocols. An eventually relinquishing (<>RC) protocol that does not store messages for long is used for attempting at consensus, and an eventually quiescent (<>QC) one that stops forwarding messages after a while is used for concluding consensus. Use of <>RC protocol poses additional challenges for consensus, when the fraction, (f/n), of nodes that can crash is: (1/4)<=(f/n)<(1/2). Consensus latency and packet overhead are measured through simulations and both decrease considerably even for a modest increase in network density.
InstitutionSchool of Computing Science, University of Newcastle upon Tyne
Place PublishedNewcastle upon Tyne
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