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Analysis of Probability of Collision of CAMs in Opportunistic Vehicular Communication

For effective implementation of intelligent transportation system (ITS) sufficient bandwidth is essential. Given the increasing trend in vehicular traffic over the years, the dedicated band allocated for vehicular communication may not be sufficient for supporting the needs of future ITS. Opportunistic use of communication bands may help mitigate the problem by making available frequency bands licensed to primary users for vehicular communication. In this paper, a novel opportunistic V2X (O-V2X) scheme is proposed, that switches between C-V2X mode and an opportunistic mode, utilizing the licensed primary user band for secondary transmissions. It has been shown analytically that the opportunistic use of the primary user band can potentially reduce the probability of collision of the cooperative awareness messages (CAMS) in vehicular communication. The reduction in the probability of collision in comparison to the conventional C-V2X has been validated analytically for a range of traffic densities and transmitter-receiver distances.