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Scalable Position-Based Multicast for Mobile Ad-hoc Networks

Author(s): Matthias Transier, Holger Füßler, Jörg Widmer, Martin Mauve, Wolfgang Effelsberg.
Title: Scalable Position-Based Multicast for Mobile Ad-hoc Networks
Published: TR-04-002, Department for Mathematics and Computer Science, University of Mannheim, January 2004
Abstract: In this paper we present Scalable Position-Based Multicast (SPBM),a multicast routing protocol for ad-hoc networks. SPBM uses the geographicposition of nodes to provide a highly scalable group membership scheme and toforward data packets in a way that is very robust to changes in the topology ofthe network. SPBM bases the forwarding decision on whether there are groupmembers located in a given direction or not, allowing for a hierarchicalaggregation of membership information: the further away a region is from anintermediate node the higher the level of aggregation should be for thisregion. Because of aggregation, the overhead for group membership managementscales logarithmically with the number of nodes and is independent of thenumber of multicast senders for a given multicast group. Furthermore, we showthat group management overhead is bounded by a constant if the frequency ofmembership updates is scaled down with the aggregation level. This scaling ofthe update frequency is reasonable since the higher the level of aggregationthe lower the number of membership changes for the aggregate. The performanceof SPBM is investigated by means of simulation, including a comparison withODMRP, and through mathematical analysis. We also describe an open sourcekernel implementation of SPBM that has been successfully deployed on hand-heldcomputers.
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