The focus of this paper is to demonstrate an over-the-air (OTA) 5G new radio (NR) sidelink communication prototype. 5G NR sidelink communications allow NR UEs to transfer data independently without the assistance of a base station (gNB), which enables V2X communications, including platooning, autonomous driving, sensor extension, industrial IoT, public safety communication and much more. Our design leverages the open-source OpenAirInterface5G (OAI) software, which operates on software-defined radios (SDRs) and can be easily extended for mesh networking. The software includes all signal processing components specified by the 3GPP 5G sidelink standards, including Low-Density Parity Check (LDPC) encoding/decoding, polar encoding/decoding, data and control multiplexing, modulation/demodulation, and orthogonal frequency-division multiplexing (OFDM) modulation/demodulation. It can be configured to operate with different bands, bandwidths, and antenna settings. The first milestone in this work was to demonstrate the completed Physical Sidelink Broadcast Channel (PSBCH) development, which conducts synchronization between a Synchronization Reference (SyncRef) UE and a nearby UE. The SyncRef UE broadcasts a sidelink synchronization signal block (S-SSB) periodically, which the nearby UE detects and uses to synchronize its timing and frequency components with the SyncRef UE. Once a connection is established, the next developmental milestone is to transmit real data (text messages) via the Physical Sidelink Shared Channel (PSSCH). Our PHY sidelink framework is tested using both an RF simulator and an OTA testbed with multiple nearby UEs. Beyond the development of synchronization and data transmission/reception in 5G sidelink, we conclude with various performance tests and validation experiments. The results of these metrics show that our simulator is comparable to the OTA testbed.
Sustainable Air-Ground Integrated Coverage Networks: ISCC Architecture, Technologies, and Testbed
State Key Laboratory of Integrated Service Networks, Institute of Information Science, Xidian University（西安电子科技大学综合业务网理论及关键技术国家重点实验室信息科学研究所）；College of Computing and Data Science, Nanyang Technological University（南洋理工大学计算与数据科学学院）；School of Information and Communication Engineering, Dalian University of Technology（大连理工大学信息与通信工程学院）
第三代合作伙伴计划（3GPP）最近发布了其版本16，其中包括基于5G新无线电（NR）空中接口的第一个车辆到一切（V2X）标准。5G NR V2X在5G NR空中接口之上引入了高级功能，以支持具有严格要求的连接和自动驾驶用例。本文介绍了用于V2X通信的3GPP Release 16 5G NR V2X标准的深入教程，特别关注侧链路，因为它是5G NR V2X最重要的部分。本文的主要部分是深入讨论5G NR V2X的关键方面：物理层，资源分配，服务质量管理，Uu接口的增强和V2N（车辆到网络）通信的移动性管理，以及5G NR V2X和LTE V2X之间的共存机制。我们还回顾了用例、系统架构，并描述了5G NR V2X的评估方法和模拟假设。最后，我们展望了可能的5G NR V2X增强功能，包括第17版中确定的增强功能。
