Experimental Evaluation of Adjacent Channel Interferences Effects on Safety-related V2X Communications

A delegated act has been recently issued by the European Commission (EC) encouraging the deployment of C-ITS systems across Europe. As a first phase, ITS-G5 operating over 5.9 GHz and 4G technologies are chosen to be the key enablers of Day-1 C-ITS services. In this context, Vehicle-to-everything (V2X) communications, enabled over the ITS-dedicated 5.9 GHz frequency band, have drawn much attention due to its potential to improve traffic safety, efficiency, and comfort. Although the exclusive use of these frequencies for vehicular communications, the urgent need to support multiple services over different channels may hinder successful communications. This is due to the adjacent channel interference (ACI) which can make packet reception and transmission operations very challenging. To investigate the ACI behavior of the ITS-G5 technology, this paper sheds light on the effects of this phenomena in multichannel vehicular networks with focus on the ITS-G5 receiver side. Through extensive real experiments using our V2X emulators platform, results corroborate the negative impacts of ACI on simultaneous channels usage.