Performance Analysis of One-Way Highway Vehicular Networks With Dynamic Multiplexing of eMBB and URLLC Traffics

The services of enhanced mobile broadband (eMBB) and the ultra-reliable low-latency communication (URLLC) enabled by 5G new radio (NR) are considered as the essential prerequisites of the future intelligent transportation systems. Particularly, the eMBB service is designed to provide extremely high data rate for content delivery and thereby can significantly enhance the quality of experience (QoE) of the bandwidth-hungry in-vehicle entertainment applications. On the other hand, the URLLC is designed to tackle the stringent requirements on the latency and reliability of the critical packets transmissions, and thereby can facilitate the autonomous driving of the connected vehicles. In this paper, under the scenario of a one-way highway vehicular network, we address the issue of joint resource allocations of the eMBB and URLLC traffics for the enhancement of the network performance. The eMBB traffic is assumed to be full-buffered and scheduled at the boundary of each time slot for multimedia transmissions. During each eMBB transmission interval, random arrivals of URLLC traffics are assumed. To satisfy the latency constraint of the URLLC transmissions, the eMBB time slot is divided into minislots and the newly arrived URLLC traffic is promptly scheduled in the next minislot by puncturing the on-going eMBB traffics. Further, to guarantee the reliability of the URLLC traffic, guard zones are deployed around the vehicle receivers as protections and the eMBB transmissions inside the guard zones are prohibited. Under this context, we first derive the transmission probability of the RSU nodes. Then, based on the obtained results, we capture association probabilities of the vehicle receivers for URLLC and eMBB traffics, respectively. Finally, the coverage performance of the vehicle-to-vehicle (V2V) links and the rate coverage performance of the vehicle-to-infrastructure (V2I) links are analyzed.