Abstract
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.
Highlights
The recent achievements of autonomous driving and enormous demands for the more efficient traffic management have boosted the development of the intelligent transport system (ITS) [1]–[6]
To satisfy the latency constraint of the ultra-reliable low-latency communication (URLLC) transmissions, the enhanced mobile broadband (eMBB) time slot is divided into minislots and the newly arrived URLLC traffic is promptly scheduled in VOLUME 7, 2019
To guarantee the reliability of the URLLC traffic, guard zones are deployed around the vehicle receivers as protections and the eMBB transmission inside the guard zones are prohibited
Summary
The recent achievements of autonomous driving and enormous demands for the more efficient traffic management have boosted the development of the intelligent transport system (ITS) [1]–[6]. We consider a one-way highway vehicular network with the locations of the vehicle nodes and road side unit (RSU) nodes modeled as 1D Poisson point processes (PPPs) on a straight line of infinite length. 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 VOLUME 7, 2019. The RSU nodes are assumed to follow 1D homogeneous Poisson point processes with density λr which is independent from the vehicle nodes. The vehicle receivers are assumed to be associated with the nearest RSU node by default for eMBB transmissions. To guarantee the reliability of the URLLC traffic, guard zones with radius Rd are deployed around the vehicle receivers which receive the URLLC messages as protections and the eMBB transmissions inside the guard zones are prohibited
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