article · IEEE Internet of Things Journal
Smart cities depend heavily on the Internet of Things to enhance quality of life, optimise resource consumption, and protect urban environments. By collecting and analysing environmental data, connected devices generate insights that support informed decision making across key sectors, including smart homes, energy grids, healthcare systems, and urban transport networks. However, large-scale implementation faces substantial technical hurdles, particularly regarding device heterogeneity, network scalability, data security, and citizen privacy. To overcome these barriers, modern smart city development increasingly focuses on platform interoperability and micro-service system architectures. Furthermore, the integration of advanced 5G and 6G wireless communication networks offers new opportunities to handle growing data volumes and expand device connectivity. Examining real-world case studies reveals operational lessons, demonstrating how comprehensive cross-sector integration, rather than isolated single-purpose systems, underpins effective smart municipal deployments.
Rapid urbanisation places increasing pressure on municipal infrastructure and resources. Harnessing connected sensor networks allows municipal authorities to monitor environments and manage public utilities more efficiently. Understanding the systemic challenges surrounding network integration, privacy protection, and advanced connectivity standards helps urban planners and developers build secure, resilient municipal systems that sustainably enhance living standards for city residents.
This synthesis addresses urban technology providers, system integrators, and municipal planning bodies working on smart utilities, transport, and healthcare platforms. Because the work is a broad conceptual review and architectural evaluation based on existing literature and case studies, it sits at an early, strategic stage of development rather than providing an immediately deployable product. It offers design guidance for developers prioritising micro-service architectures and interoperability standards for next-generation 5G and 6G deployments.
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Smart cities rely mainly on the Internet of Things (IoT) to make an urban area smart to offer its citizens a high quality of life with optimal use of resources and preservation of the environment. IoT is the key component that collects raw data on the surrounding environment to be analyzed to extract information that supports decision making. The widespread use of IoT results in the emergence of smart homes, smart energy, smart transportation, and smart healthcare, which build a smart city. On the other hand, challenges, such as heterogeneity, scalability, security, and privacy, hinder the efficient functioning of the IoT in the construction of smart cities. This article presents a comprehensive overview on the concept of IoT moving forward to the concept of smart city, highlighting key elements and characteristics, studying and reviewing state-of-the-art research on this theme. Future directions are discussed to guide researchers, who focus on interoperability between IoT platforms in smart cities and on IoT architectures based on micro-services. Case studies of successful smart cities are presented for gaining learned lessons. The impact of integrating wireless networks (5G and 6G) in the IoT is also clarified in the future direction. The significance of this research is found in its comprehensive examination of various aspects of the smart city instead of concentrating on a singular facet.
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DOI: 10.1109/jiot.2024.3449753
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