Fallout of different routing structures for different mobility patterns in large ad-hoc networks

Two nodes in a mobile adhoc network (MANET) can communicate to each other directly only when they are in the direct broadcast range of each other. Otherwise for effective communication across the network, multi hop routing is used. Recent situations and real world scenarios demand some more realistic networks which can inculcate large number of nodes. The actual advantage of MANETs can be explored only in large number of nodes. This exercise can support to inspect the scaling of a routing protocol on ad hoc network system. Therefore, implementing the adhoc environment of MANET with large scenarios is need of the day. Although many routing proposals are available in the existing literature of MANET, but unfortunately hardly a few pays attention to the scalability of the routing protocols. Mobility of the nodes affect the number of average connected paths, the number of delivered/ dropped packets etc, which ultimately affects the performance of the routing protocol. This paper addresses the effect of growing network size and movement of nodes on Random waypoint, Manhattan Grid and Guass-Markov mobility models using flat routing (AODV) and hierarchical routing (CBRP) protocols. The results of the paper over different performance parameters victimizes that cluster based hierarchical routing is more suitable in the presence of mobility with different mobility models and large network scenarios.