3GPP NR V2X Mode 2: Overview, Models and System-Level Evaluation

Abstract

Following the successful use of sidelink in Long Term Evolution (LTE) for Proximity Services (ProSe) and Cellular Vehicular-to-everything (C-V2X), the 3rd Generation Partnership Project (3GPP) is working towards its evolution in New Radio (NR) systems in the context of the so-called NR V2X. This new technology is expected to complement LTE C-V2X for advanced services by offering low latency, high reliability, and high throughput V2X services for advanced driving use cases. To do this, NR V2X is equipped with new features, such as the support for groupcast and unicast communication, a novel feedback channel, and a new control channel design. In this paper, we provide a complete history of sidelink technology in 3GPP followed by a detailed overview of NR V2X technology, with special emphasis on Mode 2 for out of coverage operation and autonomous resource selection. Furthermore, this paper presents a system-level NR V2X standard-compliant simulator, as an extension of the popular and open-source NR network simulator 5G-LENA, based on ns-3. In particular, we focus on the design, implementation, and evaluation of the sensing-based resource selection in NR V2X Mode 2, in a highway scenario for a platooning use case. Through several and extensive simulation campaigns, we test the impact of different NR V2X parameters, such as the numerology, the resource selection window size, the number of retransmissions, the maximum number of resources per reservation, and the probability of keeping the same resources during reselection, in a sensing-based resource selection. Finally, we provide a comparison campaign that shows the gains attained by the sensing-based resource selection, proposed during 3GPP Release 16, over the random selection strategy, considered in 3GPP Release 17 for power saving purposes.

Effective PSCCH Searching for 5G-NR V2X Sidelink Communications

“…Finally, the Proposed algorithm could clearly replace the blind approaches for PSCCH searching in all schemes presented in [15][16][17][18][19][20][21][22][23][24][25][26]. Therefore, it could be an interesting approach for real-time systems, since it ensures a significant reduction of runtime and it is compatible with several schemes proposed in the literature.…”

“…After the sensing window, we have the selection window, where the candidate subchannels are selected and occupied. In [16], an open-source, fullstack, end-to-end, standard-compliant network simulator was presented, where the physical layer receives the first stage SCI transmitted over PSCCH to measure the RSRP and to get the information about the possible PSSCH. The RSRP is computed using the three resource elements (REs) per resource block (RB), carrying the first stage SCI, because the simulator does not explicitly have PSCCH DMRS.…”

3GPP 5G V2X Scenarios: Performance of QoS Parameters Using Turbo Codes

“…References [2,3] provide an overview on V2X standardization on the New Radio (NR) side−link design as part of 3GPP New Radio (NR) Release 16, which improves network architecture, security, physical layer and protocol aspects considering the reliability and low latency requirements. In [4] the authors provide a history of the 3GPP side−link technology together with an overview of NR V2X technology, with emphasis on Mode 2 for out of coverage operation and autonomous resource selection. Furthermore, [4] presents a system−level NR V2X standard−compliant simulator and it also provides a comparison of sensing−based resource selection (Release 16) and random selection (Release 17) for power saving purposes.…”

“…In [4] the authors provide a history of the 3GPP side−link technology together with an overview of NR V2X technology, with emphasis on Mode 2 for out of coverage operation and autonomous resource selection. Furthermore, [4] presents a system−level NR V2X standard−compliant simulator and it also provides a comparison of sensing−based resource selection (Release 16) and random selection (Release 17) for power saving purposes. Finally, [5] mentions that Release 16 cellular interface and NR side−link interface are designed to enable platooning, advanced driving, extended sensors and remote driving.…”

On the impact of numerology in NR V2X Mode 2 with sensing and random resource selection

“…In this paper, we consider an extension of the open source, end-to-end, ns-3 5G-LENA simulator [13], which we have developed to support NR V2X capabilities [14]. Building upon such a standard-compliant simulation platform, we focus on assessing the impact of the NR numerologies on the NR V2X Mode 2, and to understand how it affects the PHY and MAC layers, from an end-to-end perspective.…”