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Future smart vehicles will incorporate high-data-rate communications andhigh-resolution radar sensing capabilities operating in the millimeter-wave andhigher frequencies. These two systems are preparing to share and reuse a lot ofcommon functionalities, such as steerable millimeter-wave antenna arrays.Motivated by this growing overlap, and advanced further by the space and costconstraints, the vehicular community is pursuing a vision of unified vehicularcommunications and radar sensing, which represents a major paradigm shift fornext-generation connected and self-driving cars. This article outlines a pathto materialize this decisive transformation. We begin by reviewing the latestdevelopments in hybrid vehicular communications and radar systems, and thenpropose a concept of unified channel access over millimeter-wave and higherfrequencies. Our supporting system-level performance characterization reliesupon real-life measurements and massive ray-based modeling to confirm thesignificant improvements brought by our proposal to mitigating the interferenceand deafness effects. Since our results aim to open the door to unifiedvehicular communications and radar sensing, we conclude by outlining thepotential research directions in this rapidly developing field.

On Unified Vehicular Communications and Radar Sensing in Millimeter-Wave and Low Terahertz Bands