Measuring VoIP Performance in IEEE 802.11P Vehicular Networks

This paper studies, for the first time to our best knowledge, VoIP performance over V2V IEEE 802.11p links. VoIP performance is evaluated in terms of both throughput and jitter through on-the-road measurements, investigating also the effects of inter-vehicle distance and speed on VoIP performance. Results of our study show that VoIP performance is quite poor, especially due to an excessively large number of lost packets under all investigated scenarios. In-lab experiments performed to investigate possible causes of this poor performance reveal that throughput degradation is likely to be due to inefficiencies in implementation of the vehicular networking stack, rather than to poor communication quality.