secured, processed, and transmitted. With respect to technologies, the evolution towards 6G is key for a definition of the future. However, several recent initiatives have become relevant. The evolution of Internet of Things (IoT) has changed technologies, and now we have internet of Tracking Dimensioning Positioning Mobility Capacity IEEE802.1 11p Coverage Interference Scalability Problems Technologies Security Vehicular Communications Computing Challenges Paradigms Smart Autonomous cities vehicles Cognitive communications Fig. 7.5 Challenges seen from three different perspectives L. Azpilicueta et al. vehicles (IoV) as a concept that connects anything, anyone, anytime, and anyplace [46]. IoV will serve to reduce problems such as collisions while at the same time increasing connectivity through low-latency links with reliability and high bandwidth. Resource sharing to achieve connectivity will be essential, and some solutions have been based on games and cooperative algorithms. The service will need infrastructure composed of distributed antenna systems and wireless devices or sensors that work with an open and distributed network architecture to guarantee service provisioning. The integration of vehicles with UAV or drones is essential. UAV could help in safety and security tasks and will help to increase coverage in certain conditions of high volume of vehicular traffic. UAVs could be relays and also could serve as access points for certain activities, e.g., emergency scenarios with critical information delivery. The applications of UAVs are expanding from delivery of objects to supporting air traffic control tasks and infrastructure inspection; see [47]. For some of those activities, low latencies and moderate data rates are essential, depending on the need of a real-time connectivity. UAVs can even provide relay functions for remote infrastructure or even satellite communications integration with 5G networks or vehicular networks. Vehicles will have VANETs where a network can be established without the need 