Performance evaluation for DSRC vehicular safety communication: A semi-Markov process approach

In this paper, an analytic model is proposed for the performance evaluation of vehicular safety related services in the dedicated short range communications (DSRC) system on highways. The generation and service of safety messages in each vehicle is modeled by an M/G/1 queue. A semi-Markov process (SMP) model is developed to capture contention and backoff behavior in IEEE 802.11 broadcast ad hoc networks. Furthermore, this SMP interacts with the M/G/1 queue through fixed point iteration. Based on the fixed-point solution, performance indices including transmission delay and packet delivery ratio (PDR) are derived. Hidden terminal problem is taken into account for the PDR computation. Analytic-numeric results are verified through extensive simulations under various network parameters. Compared with the existing models, the proposed model is more general and accurate.