Safety in Vehicular Networks—On the Inevitability of Short-Range Directional Communications
Abstract
Safety implies high dependability and strict timeliness under worst-case conditions. These requirements are not met with existing standards aimed at inter-vehicular communications (V2V) in vehicular networks. Ongoing research targets medium-range omnidirectional V2V communications and short-range directional communications, which we refer to as neighbor-to-neighbor (N2N) communications. Focusing on the latter, we investigate the time-bounded message dissemination (TBMD) problem as it arises in platoons and ad hoc vehicle strings, referred to as cohorts. Informal specifications of TBMD, of a solution, are given. We show how to guarantee cohort-wide dissemination of any N2N message generated by a cohort member, either spontaneously or upon receipt of a V2V message. Dissemination time bounds are given for worst-case conditions regarding N2N channel contention and N2N message losses. These results add to previously demonstrated merits of short-range directional communications as regards safety in vehicular networks.
Origin : Files produced by the author(s)
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