Research in Mobile Intelligence : Mobile Computing and by Laurence T Yang

By Laurence T Yang

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3 Network Assumptions and Preliminaries 29 localized, but does not guarantee a good approximation ratio. Hereafter, this algorithm is referred to as Rule 1&2 (so named for the two pruning rules). Stojmenovic et al. also presented a distributed construction of CDS in the context of clustering and broadcasting [12]. The solution proposed in Ref. [23] relies on all nodes having a common clock and requires two-hop neighbor information. In CEDAR [13], a virtual infrastructure called the core is constructed to approximate a minimum dominating set (not connected) of the underlying network.

The dashed arrows indicate the propagation of RREQs that are not successful. these border nodes in the routing zone of S. There are two possibilities, either D is within the routing zone of B (recall that each node proactively maintains its routing zone) or D is not within the routing zone of B. In the first case, B can send a RREP packet back to S as it has a path to D from its routing table. B needs to forward the RREQ further in the second case and this is again done by using the border nodes of B’s routing zone.

There is a variant of the AODV protocol called the multipath AODV (AOMDV) [11] in which each node keeps multiple forward path entries for each route. For example, suppose a source node S has requested a route for a destination D and the resulting RREQ packet has passed through an intermediate node J. J may receive multiple RREP packets in future in reply to this RREQ. Assume that J receives RREP packets from three of its neighbors U, V, and W. In the original AODV protocol, J chooses only one of these three neighbors for keeping a forward path entry in its routing table and rejects the other two.

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