Implementation and performance study of route caching mechanisms in DSR and HER routing algorithms for MANET

Abstract

Route caching strategy is an important on-demand routing protocol for mobile ad hoc networks. On-demand routing protocol for mobile ad hoc networks utilizes route caching in different forms to reduce overheads, peer-to-peer delay. This paper presents a variation in view compared to DSR and HER, to minimize cache staleness, partitions and enhance reliability of service. The variation is with respect to identification of route and cache validation of errors using different techniques namely Update Route Caching (URC), Temporal Cache Validation (TCV), Negative Cache Validation (NCV) and Combined Cache Validation (CCV). The proposed method refreshes cache more often than the DSR and HER thereby initiating route requests earlier, when a route still being used is broken, thus reducing peer to peer delay to transmit packets. The results of GloMoSim simulator validates higher cache hit percentage and reliable delivery of packets in the technique Combined Cache Validation (CCV) when in comparison to DSR and HER © Springer-Verlag Berlin Heidelberg 2005.