In this work we introduce our efforts to implement a vehicular (V2X) communication system that is fully compliant with the requirements of the Scandinavian NordicWay project. In particular, we focus our efforts on the implementation of the project’s Traffic Signal Priority use case in which selected vehicles are able to send signal request messages (SRMs) to the traffic light controller in order to request priority for green light at specific intersections. We discuss the basic flow of the request/response messages, how messages are constructed according to the geographic data of the road infrastructure. Finally, we show how a vehicle sends messages using the Interchange, the key component of the NordicWay project, and its distinctive characteristic versus other state of the art vehicular communication frameworks.
The fifth generation (5G) new radio (NR) vehicle to everything (V2X) evolved as a key enabler in order to support advanced use cases for connected vehicles and automated driving applications with stringent reliability and latency requirements. One of the most significant parts of 5G NR V2X is the sidelink distributed resource allocation mode known as mode 2 in which vehicles do the resource allocation autonomously. This paper targets the third generation partnership (3GPP) 5G NR V2X mode 2 resource allocation enhancements, with a particular focus on inter user coordination between vehicles. Inter user coordination feature allows vehicles using the NR V2X mode 2 to exchange cooperation messages. Thus, acquiring additional information for resource allocation compared to the baseline fully distributed approach adopted in release 16, by overcoming the hidden node problem for instance. In this paper, we propose a practical inter user coordination framework for NR V2X mode 2 enhancement in different cast scenarios. Moreover, we show the gain achieved in packet reception ratio (PRR) by such framework using system level simulations.
Due to the fact of the increasing necessity and demands of the vehicle to everything communications (V2X), which includes vehicle to vehicle (V2V) and vehicle to infrastructure (V2I) communications, new communication technologies need to be deployed and tested in real environments. Moreover, Cooperative Awareness Messages (CAM) and Decentralised Environmental Notification Messages (DENM) should be analysed and understood so as to determine which type of message should be sent when a specific alert has to be transmitted. In this paper, a communication schema with the ability to manage alerts generated in a Traffic Control Center, transforming them to the corresponding DENM messages and sending them to the requiered roadside unit (RSU) will be explained and tested in a real deployment scenario. In addition to this, to be able to easily test different scenarios of future real deployments a simulation of it will be explained that will help to create more specific scenarios and implement improvements without further cost or delay with the conclusion that the simulation tool needs more development to appropiately test V2X communications in real environments.
Heterogeneous multi-hop relaying deployment that involves both Uu and PC5 interface is potentially a promising technology to overcome the high propagation loss, blockage and mobility sensitivity in millimeter wave band communication for next-generation railway system. In this context, we analyze the radio resource management that targets different train applications under such deployment. Adopting the system deployment, channel and antenna configuration of 3GPP, we propose an approach that jointly optimizes radio resource management and routing topology for multi-hop relaying transmission involving both Uu and PC5 interface. The system level simulation results exhibit that the joint optimization outperforms the existing conventional algorithm. Simulations and analysis can also serve as feasibility analysis and guideline for a possible architecture in future train radio deployment.
Currently, internal communications in trains are based on wired networks to provide Ultra-reliable Low Latency Communications (URLLC) for control and monitoring systems. However, these wired infrastructures are expensive to implement and maintain. Wireless Consist Networks (WLCN) can be a solution to this problem. Particularly, 5th Generation (5G) networks are considered one of the best options to support URLLC. This paper analyzes the use of 5G technology for a Wireless Consist Network (WLCN), as a replacement for the current wired network inside train consists. The goal of this analysis is to calculate which 5G configurations are capable of supporting the worst case of the required train backbone traffic. Obtained results indicate that 5G is a potential technology for sensor and end devices communication in the WLCN.
