Performance Analysis of Drop Policies in Delay Tolerant Networks Using One

Challenged networks are infrastructure less networks and connectivity in such network is mostly episodic. These networks have limited resources e.g. buffer, bandwidth, power etc., and short contact durations with neighbor nodes. Therefore, information dissemination itself is open research issue. Routing follows store carry forward mechanism across the node or relays. With finite storage capacity, buffer may get overflow even in limited contact opportunities. These impacts on delivery ratio, resource utilization and increase in overhead. Thus, there is a need of drop policy at each node that should improve the delivery ratio or have minimum impact on delivery ratio, improve resource utilization and reduce overhead. In this paper, various drop policies, their implementation, simulation scenario and behavior is experimented. It is carried out using different synthetic data sets using opportunistic network environment (ONE) simulator. This investigation is done to study, analyze and understand the behavior of existing drop policies under varying network conditions & routing protocols and propose the better drop policy in future.