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In Release 14, 3GPP introduced a novel paradigm known as cellularvehicle--to--everything (C-V2X) \emph{mode-4} to specifically support vehicularcommunications in scenarios without network coverage. Such a scheme has beendevised to operate distributedly harnessing a sensing mechanism wherebyvehicles can monitor the received power across subchannels. Based on themeasured power intensities, vehicles autonomously select a suitable subchannelover which safety messages are broadcasted. The selected subchannel is utilizedby the vehicle for a short period of time before releasing it to select anothersubchannel. In this work, we propose a scheduling approach based on theaforementioned technology. We assume the existence of a primary sub-band thatsupports semi-persistently reserved subchannels (as specified by 3GPP). Inaddition, we also consider that there exist auxiliary sub-bands that conveyrandom re-transmissions in order to improve reception reliability. Differentconfigurations of the proposed approach are explored and their performance areassessed using real vehicular traces.

Decentralized Subchannel Scheduling for C-V2X Mode-4: A Non-Standard Configuration for CAM Retransmissions