5GMED Connected and Automated Mobility and Future Railway Mobile Communication Use Cases in the Mediterranean Cross-Border Corridor Jad Nasreddine∗, Ricard Vilalta‡, Giovanni Rigazzi§, Philippe Veyssiere†, Ra¨ul Gonz´alez§ and Francisco V´azquez-Gallego∗ ∗i2CAT Foundation, Barcelona, Spain †IRT Saint Exup´ery, Toulouse, France ‡ Centre Tecnol`ogic de Telecomunicacions de Catalunya (CTTC/CERCA), Castelldefels, Spain § Cellnex Telecom, Barcelona, Spain Abstract—The 5GMED project will demonstrate advanced Cooperative, Connected and Automated Mobility (CCAM) and Future Railway Mobile Communications System (FRMCS) use cases along the cross-border corridor between Figueres (Spain) and Perpignan (France), enabled by a multi-stakeholder compute and network infrastructure based on 5G and offering support for AI functions, and deployed by MNOs, neutral hosts, and road and rail operators. Several large-scale trials will be conducted to evaluate the capabilities of 5G to meet the requirements of the use cases in the cross-border mobility scenario. In this paper, we present the 5GMED project, its use cases and the proposed 5G network architecture. Keywords—5G, use cases, CCAM, FRMCS, cross-border, trials. I. INTRODUCTION A number of critical Cooperative, Connected and Auto- mated Mobility (CCAM) use cases imply stringent real-time connectivity requirements, leading to a scenario where best- effort connectivity provisioning does not comply. The majority of current 5G deployments are not designed to meet those requirements, which include the support for ultra-reliable low- latency communication (URLLC)-type services as well as availability in sparsely populated areas for delivering high data-rates. To achieve such objectives, dense cell deployments, including necessary optical fiber roll-out as well as Multi- access Edge Computing (MEC) will be important [1]. In cross-border corridors, Mobile Network Operators (MNO), neutral hosts, and road/rail operators usually own separate network and compute infrastructures, each with their own service orchestration capabilities tailored to the business of each specific stakeholder [2]. As 5G is also expected to be instrumental for railway communications, there is the main objective to adopt novel network architectures that consider all the rail communication services over a single network, instead of the expensive mixture of access networks used today, which leads to the design principles of the Future Railway Mobile Communication System (FRMCS) [3]. Motivated by this context, the 5GMED project aims at the deployment of a multi-stakeholder network and compute infrastructure based on 5G to demonstrate advanced CCAM and FRMCS use cases along the Mediterranian cross-border corridor between Figueres (Spain) and Perpignan (France). In 5GMED, several novel technologies are under investigation to meet the requirements of the use cases. These technologies include enhancements to accelerate 5G roaming procedures across MNOs and neutral hosts, multi-connectivity solutions supporting vehicles and high-speed trains, novel broadband ac- cess network architectures for railways, cross-operator service orchestration, and the ability to execute AI-enabled functions at the edge of the network. This paper introduces the 5GMED project, the proposed use cases, and the main features of the network architecture to be deployed along the Mediterranian cross-border corridor. II. 5GMED PROJECT OVERVIEW The 5GMED project is an innovation action funded by the European Union’s Horizon 2020 research and innovation programme under the 5G Public Private Partnership (5G- PPP). 5GMED will deploy a 5G Stand-Alone (SA) network infrastructure along 65 km of the European highway E-15 and the high-speed rail track of the Mediterranean cross- border corridor. It will conduct large-scale trials to evaluate the capabilities of 5G to meet the requirements of CCAM and FRMCS use cases under mobility conditions across the border. Before the executio