Towards Enhanced Searching Architecture for Unstructured Peer-to-Peer Over Mobile Ad Hoc Networks

With the rapid growth of individual mobile devices, the researchers are facing new challenges to deploy unstructured peer-to-peer (P2P) applications over mobile ad hoc networks (MANETs). Empirical studies indicates that although P2P and MANETs have similar preferences, but the resultant networks are not performing efficient and effective searching due to peer discovery, connectivity and mobility problems. To resolve these issues, the existing techniques mostly rely on flooding and random walks in P2P over MANETs to discover object of interest and thus introduce incredible network traffic. Thus, this article proposes Gnutella like unstructured P2P network to better meets the mobility requirement of ad hoc networks to optimize search performance. The proposed system presents a novel cache optimization technique and enhances ultrapeer selection scheme to make communication more efficient between peers and ultrapeer. Furthermore for quick and efficient search, we explore a novel jumping multiple walkers random walk approach with controlled replication. The proposed search mechanism not only reduces the effective query search time but also remarkably reduce network overhead. We validate our analysis and compare our proposal to competing protocols in simulations. Simulation results show that proposed scheme gives better performance than the competing protocols in terms of (1) the successful ratio of resolving a query, (2) the time and hop count of routing a query message, (3) the message overhead, and (4) average message response time.