11-162 Hongyou Wu, A. Banerjee
Fuzzy-controlled processing of packets for mobile networks (728K, Postscript) Oct 19, 11
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Abstract. Ad hoc networks are collections of mobile nodes communicating with each other through wireless media without any fixed infrastructure. The nodes have limited battery power; hence energy efficiency is required to optimize network performance. In this paper, we have designed a fuzzy controller named Power Aware Router (PAR) that is embedded in each node of the network. Whenever a route-request packet arrives at a node ni, the node immediately consults its PAR to decide whether to broadcast the route-request to its downlink neighbors or drop it. The parameters considered by PAR are broadly classified into two categories - node dependent parameters and session dependent parameters. Remaining energy of ni, congestion around it, relative velocity w.r.t. its predecessor in the communication path and present number of its downlink neighbors are node dependent parameters taken care of by the PAR of ni. Session dependent parameters come into existence if the route-request packet has been generated as a result of some link breakage in between a communication session. In that situation, PAR of ni takes into account the number of link breakages that already occurred in the respective session and the number of data packets yet to be transmitted. In the simulation section, we have compared some state-of-the-art and well-known routing protocols in ad hoc networks, for eg. DSR (dynamic source routing), AODV (ad hoc on-demand distanve vector), ABR (associativity based routing) and FORP (flow-oriented routing protocol with their PAR-embedded versions i.e. PAR-DSR, PAR-AODV, PAR-ABR and PAR-FORP. Very encouraging results are reported. PAR-embedded intelligent protocols produce huge improvements compared to their original versions. Performance matrices considered in this article are, energy consumption, routing overhead, delivery ratio and latency, each versus total number of nodes in the network and total number of connections or links.

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