Most simulations and performance comparisons of mobile ad hoc network routing protocols are based on a simplistic and idealistic physical layer model. In real applications, there are different kinds of noise or interference that impact the signal power. We use a shadowing propagation model in our simulation evaluation of two on-demand routing protocols: AODV and DSR. Because of signal power fluctuation, active routes will break, which causes significant throughput degradation and longer packet delay. In this paper, we analyze the impact of a shadowing model on the performance of these two routing protocols. Then we set a new signal power threshold during the route discovery process so that only those links with strong enough signal power will be chosen; we also reduce some control messages for DSR. The simulation results show significant increases in packet delivery ratio and decreases in packet latency for both protocols.

Additional Metadata
Citation
Qin, L. (Liang), & Kunz, T. (2003). On-demand routing in MANETs: The impact of a realistic physical layer model.