On Latency and Reliability of CDMA-based Tntervehicle Communication

摘要

The availability of global position system technology, rapid evolution of wireless data communication technologies and advances in mobile ad hoc networking create ample opportunities for supporting delay-critical vehicular safety applications. Currently, IEEE 802.11 is considered as a candidate to support future vehicle safety systems due to its increased reliability and price reduction experienced during the last decade. However, IEEE 802.11 suffers from delivery latency and packet collision at high loads because of the underlying contention based CSMA/CA medium access control. In this paper, we present simulation results which highlight distinguishing features of CDMA broadcast communication, as compared to CSMA/CA, in terms of per packet latency and packet success probability. It is confirmed, through simulation studies that, in contrast to CSMA/CA, CDMA-based medium access is capable of offering not only bounded latency but also highly reliable exchange of safety messages between neighboring vehicles even at high vehicle densities.