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In the last few years, two technologies have been developed to enable directexchange of information between vehicles. These technologies, currently seen asalternatives, are ITS-G5, as commonly referred in Europe, and sidelinkLTE-vehicle-to-everything (LTE-V2X) (one of the solutions of the so-calledcellular-V2X, C-V2X). For this reason, the attention has been mostlyconcentrated on comparing them and remarking their strengths and weaknesses tomotivate a choice. Differently, in this work we focus on a scenario where bothare used in the same area and using the same frequency channels, without theassistance from any infrastructure. Our results show that under co-channelcoexistence the range of ITS-G5 is severely degraded, while impact on LTE-V2Xis marginal. Additionally, a mitigation method where the CAM data generation isconstrained to periodical intervals is shown to reduce the impact of co-channelcoexistence, with less degradation on ITS-G5 performance and even improvementfor LTE-V2X.

Co-channel Coexistence: Let ITS-G5 and Sidelink C-V2X Make Peace