Performance of BSM Dissemination in Multi-Channel DSRC

To support both safety and non-safety applications in vehicular communications, IEEE 1609.4 protocol defines a channel switching mechanism to enable a single radio to operate efficiently on multiple channels. Basic safety message is transmitted only through control channel at regular intervals. In this paper, an analytic model based on semi-Markov process is proposed to evaluate MAC level performance and reliability of safety message dissemination incorporating the impact of the multi- channel operations. Safety message service time distribution is derived using Laplace-Stieltjes transform based on the proposed model. Subsequently, fixed-point iteration is used to obtain converged solutions. MAC level performance metrics are then derived. Channel fading with path loss is taken into account in this derivation. The analytic models are validated through simulations in NS2 to verify the effectiveness and accuracy of the proposed model.