Performance Evaluation of Voice over the Vehicular Ad-Hoc Network using the Optimized Link State Routing Protocol

Abstract

Voice over Internet Protocol (VoIP) provides good services through Vehicular Ad-hoc Networks (VANET) platform. These networks encountervarious challenges to support voice calls with acceptable Quality of Service (QoS).The Optimized Link State Routing Protocol (OLSR) is used in order to investigate the performance for VoIP application in VANET network.The research aims to evaluate network performance for moving vehicles after configured it to work properly in suitable environment in order to obtain accurate data and analyze QoSparameters for each different case. The network was tested before and after running OLSR algorithm, the tests focused on QoSparameters such as end-to-end delay, delay variation (jitter) and probability of packet loss between two moving hops through multi-hop Ad-hoc networks in different scenarios using the ITU G.711 VoIP codec.After measured the end-to-end delay,jitter and probability of packet loss for two nodes the algorithm decreased delay with 18.72%, while decreased jitter about 20.42% and decreased packet loss about56.25%. However, The OLSR shown initial good performance for four hops and when added more hops the delay exceeded 400ms which is not acceptable according to ITU-T recommendations. This was achieved by implementing a test bed to obtain desired results rather than use a simulation.