Effects of Duplicate Packet Transmission in Timer based Co-ordination Opportunistic Routing Scheme

In general, Energy consumption and network throughput (NT) are the most important network performance parameters. Wireless sensor network (WSN) applications having low packet generation rate deploy less expensive nodes will have limited battery life and processing capability. Timer based co-ordination (TBC) scheme for Opportunistic Routing (OR) protocol is an attractive prospect for such applications due its inherent capability to co-ordinate transmissions without any need of control signals. In this paper we study problems of duplicate packet transmission occurring in TBC and its effect on performance of a one dimensional (1-D) queue network for various prioritization parameters. We analyze performance of prioritization parameters used in the most forward progress algorithm (MFR), Optimum distance algorithm (OPD) and energy saving via opportunistic routing algorithm (ENS_OR) and conclude that linear mapping of priorities to waiting time causes duplicate packet transmissions resulting in reception of duplicate packets at the sink leading to increased energy consumption and reduction in network throughput.