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Co-channel coexistence between Dedicated Short-Range Communications (DSRC)and Wi-Fi needs thorough study. The reason is that although the 5.850-5.925 GHz(5.9 GHz) band has been reserved for DSRC so far, the U.S. government is movingswiftly on opening the band to be shared with Wi-Fi. However, most prior worklacks sufficient scientific rigor by relying on performance metrics such aspacket delivery rate (PDR) and packet delay that cannot accurately measureperformance of a vehicular network that primarily uses broadcast indissemination of packets. Precise analysis of such broadcast operation isessential for rigorous investigation of DSRC-Wi-Fi coexistence because mostsafety-critical applications of DSRC operate based on broadcast. This paperproposes a new metric that can more accurately characterize the performance ofa broadcast-based DSRC network. The new metric is used to (i) characterizecoexistence of DSRC with IEEE 802.11ac-based Wi-Fi and (ii) suggest selectionof key medium access control (MAC) parameters for DSRC: inter-broadcastinterval (IBI) and contention window (CW).

A Geometric Analysis Method for Evaluation of Coexistence between DSRC and Wi-Fi at 5.9 GHz