# A Real Case of Implementation of the Future 5G City
## 3 Future 5G City Use Cases
### Smart Mobility  
_Smart mobility_ is expected to support different social challenges, so having safe, efficient, reliable, and green freight and passengers transport is a widely shared policy perspective. In this context, 5G is envisaged as the ultimate platform to enable smart mobility solutions, and cellular-vehicleto everything (C-V2X) functionality will be included as part of the cellular chipsets embedded into vehicles for their vehicle to network (V2N) communications. Hence, _the smart mobility vertical domain is one of the key driving sectors for evolution towards 5G_ and one of the most important use cases under evaluation in the 5G project. The smart mobility platform that is under deployment is divided into two different use cases: the \"high connected EV road monitoring\" and the \"advanced viability.\" The main goals are the following:  
1. **Highly connected EV road monitoring**: An electric car park and charging points will be deployed with the aim of monitoring, during normal daily activities, the state of the road surface (presence of holes, slope, traffic conditions, etc.) through the installation in cars of a blackbox containing a 5G module for real-time data transmission to post-processing systems. A differential GPS, placed in electric cars, will map with centimeter precision the geographic coordinates of the holes detected during the normal use of vehicles. 2. **Advanced viability**: Connected vehicles will exchange data with other vehicles and with a control center where data traffic information is smartly integrated with weather conditions, road status, and other information provided by IoT sensors in the city. The aim is of improving the safety of vehicles and drivers, comfort, and driving style and reducing road traffic, congestion, and consequent pollution, using real time information. The reliability of the 5G network will offer advanced real-time communication services also in very high density of network nodes that can occur for example for traffic jam or an emergency situation. While 5G network deployment is ongoing, some preliminary results on the smart mobility scenario have been achieved as an outcome of enhanced studies. The aim is the evaluation of advanced techniques that will not necessarily be implemented in the field tests but that represent a step towards the full achievement of ITU-5G requirements. These preliminary results are presented in the next subsection, referring to different key technologies for the smart mobility scenario. Key Technologies The considered smart mobility platform relies on some key technologies that are currently under study. In this section, some hints and results are presented. Not all the key technologies described in this section are planned to be used in the tests officially listed in the 5G program of the Ministry of Economic Development. Anyway, additional tests can be run by universities or research centers participating to the 5G program. _Network Slicing._ V2X communications under the 5G network will be provided by specific network slices. However, nowadays efficiently managing slices is a challenge in resource allocation. Hence, the ongoing studies focus on practical algorithms that allow one to solve the problem taking into account computational complexity and the ability to reconfigure and migrate slice resources in accordance with the variable vehicular environment. At the network function layer, the aim is to realize an optimal matching among functions and slices in accordance with their descriptors. Differently, at the infrastructure level, the main challenge is how to virtualize and divide the RAN into different slices. Indeed, while at the CN level the network can be scaled up adding more hardware resources, RAN has to face with spectrum scarcity. Moreover, in the vehicular context, RAN must be flexible enough to dynamically accommodate radio resources to the slices taking into account the coexistence of cellular (V2N) and direct communication, such as vehicle-to-vehicle (V2V) communication. Two solutions are under evaluation.