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The emergence of the fifth-generation (5G) New Radio (NR) brings additionalpossibilities to vehicle-to-everything (V2X) network with improved quality ofservices. In order to obtain accurate channel state information (CSI) inhigh-mobility V2X networks, pilot signals and frequent handover betweenvehicles and infrastructures are required to establish and maintain thecommunication link, which increases the overheads and reduces the communicationthroughput. To address this issue, integrated sensing and communications (ISAC)was employed at the base station (BS) in the vehicle-to-infrastructure (V2I)network to reduce a certain amount of overheads, thus improve the spectralefficiency. Nevertheless, the exact amount of overheads reduction remainsunclear, particularly for practical NR based V2X networks. In this paper, westudy a link-level NR based V2I system employing ISAC signaling to facilitatethe communication beam management, where the Extended Kalman filtering (EKF)algorithm is performed to realize the functions of tracking and predicting themotion of the vehicle. We provide detailed analysis on the overheads reductionwith the aid of ISAC, and show that up to 43.24% overheads can be reduced underassigned NR frame structure. In addition, numerical results are provided tovalidate the improved performance on the beam tracking and communicationthroughput.

ISAC-Enabled V2I Networks Based on 5G NR: How Much Can the Overhead Be Reduced?