One Further Step Towards Realistic Simulations of Wireless Networks

T. Kuhn, H. Klassen

Technical Report 346/05, Department of Computer Science, University of Kaiserslautern, Germany, 2005

Abstract

The realistic simulation of the lower layers in the protocol stack, namely the physical layer of a wireless ad-hoc network is known to have a severe impact on the outcome of simulation results. This work focuses on the effects of simulating realistic radio propagation and on the possibility of simulating realistic radio propagation with event based network simulators. Based on an available implementation of Ricean/Raleigh fading, we did evaluate the possibility of realistic simulations with the ns-2. The main focus was on the ability of simulating grey zones accurately. The propagation characteristics of the model was then calibrated to measurement results that were obtained from multiple experiments with notebooks, equipped with wireless LAN adapters. We did also compare the outcome of simulations using generic, simplistic propagation models that are commonly used for evaluating wireless protocols with our more realistic model, showing that the usage of a realistic propagation model has a severe impact on the performance of a wireless ah-hoc routing protocol.

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