Performance of VANET safety message broadcast at rural intersections

This paper develops a new analytic model for the performance and reliability analysis of safety-related message broadcast in vehicular ad hoc networks (VANETs) at rural intersections. First, a semi-Markov process (SMP) model for characterizing channel behavior of IEEE 802.11 based VANET is deployed to interact with the M/G/1 queue through fixed-point iteration. Then, the mean transmission delay between two nodes is derived. Furthermore, given two communicating nodes placed at the same intersection, the node reception probability that a node successfully receives the broadcast message from a sending node is computed. Consequently, the packet reception ratios are derived through integration of the node reception probabilities over the intended range of the sending node. The analytical model takes intersection geometry, IEEE 802.11 backoff counter process, hidden terminal problem, and non-saturated message arrival into account. From the obtained numerical results under various network parameters, the new model is validated and new observations are obtained.