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Cellular vehicle-to-everything (C-V2X) networks are regarded as one of themain pillars to enable efficient and sustainable Intelligent TransportationSystems (ITS) safety applications and services. Such services rely on theconcept of exchanging periodic status updates (i.e., basic safety messages(BSMs)) between nearby vehicular users (VUEs). Hence, it is essential to ensuresmall inter-packet gaps (IPGs) between successive BSMs from nearby VUEs. LargeIPGs, due to successive packet losses, can result in stale information at aVUE. In this paper, we study the tail behavior of the IPG and the informationage (IA) distributions using C-V2X transmission mode 4 (a decentralizedresource allocation method based on semi-persistent scheduling (SPS)).Specifically, we investigate improvements and trade-offs introduced by theSAE-specified concept of one-shot transmissions. We use a high-fidelitysystem-level simulator that closely follows the SPS process of C-V2Xtransmission mode 4 to evaluate the performance of the interleaved one-shot SPStransmissions. Our numerical results show that the tails of the IA and IPGcomplementary cumulative distribution functions (CCDFs) are significantlyimproved when one-shot transmissions are enabled in various simulationscenarios.

Interleaved One-shot Semi-Persistent Scheduling for BSM Transmissions in C-V2X Networks