The concept of a smart city (SC) is developed on advanced information-communication technologies (ICT). The role of new 5G mobile wireless systems and Internet of Things (IoT) is discussed as essential for a successful SC infrastructure for interconnecting citizens in physical and virtual worlds. IoT-based smart cities can provide various kinds of services for citizens, including smart home, smart energy and meter systems, vehicular traffic and transportation, environmental pollution, smart health. The services are transforming cities by improving infrastructure and efficiency of the everyday activities. The huge development of smart devices, novel communication, computing and control technologies have paved the way for 5G-IoT advancement. At the same time the final goal is to provide efficient human-centric communication. In this article smart cities infrastructure evolution is presented. Moreover, an overview of the role of 5G-IoT including up-to-date development is described. Later, we continue with human-centric 5G-IoT in SC. Finally, in order to give future research directions several challenges are highlighted.
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