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Many parties claim the technical significance of Dedicated Short-RangeCommunications (DSRC) in intelligent transportation system (ITS) for promotionof transportation safety. The main challenge in this key vehicle-to-everything(V2X) standard is high odds of network congestion. Furthermore, in accordancewith a V2X network being inherently dynamic in key parameters such as vehicledensity and velocity, the networking behavior of a DSRC system is usuallyhighly complicated to analyze. In addition, the United States FederalCommunications Commission (US FCC) recently announced the "5.9 GHz bandreform," which reduced the dedicated bandwidth for DSRC to 10 MHz from 75 MHz.Motivated from these, the necessity of "lightening" the networking load of aDSRC network has become essential to keep safety-related operations withoutperformance deterioration. To this end, this paper proposes a protocol thatprioritizes transmission of a basic safety message (BSM) at a vehicle accordingto the level of danger that the vehicle experiences. The proposed protocol usesthe distance between a danger source and a vehicle as the metric to determinethe priority for transmission. Our results show that this protocol prioritizesthe transmission opportunity to dangerous vehicles, and hence results in higherperformance in terms of key metrics--i.e., average delay, throughput, andinter-reception time ($\mathsf{IRT}$).

Prioritization of Basic Safety Message in DSRC Based on Distance to Danger