<p>The rapid urbanization and the increased need for sustainability have placed the Green Internet of Things (G-IoT) at the center as the key driver of green smart cities. In this paper, a systematic literature review (SLR) of G-IoT technologies and strategies applied in urban settings is provided following PRISMA guidelines. Integrating 130 studies from 2015 to 2025, the review consolidates findings across three interconnected areas: energy-saving technology, communication protocols, and security concerns with corresponding countermeasures. Structuring these findings, the study proposes a three-category technology model and a three-layer security framework. The review highlights the most recent advances, trade-offs, and contextual suitability of G-IoT solutions while identifying gaps that require further investigation. With the merging of these perspectives, the review presents a comprehensive understanding of G-IoT's role in improving energy efficiency, adaptability, and sustainability in smart cities as well as outlining avenues for future research towards achieving greener, adaptive urban environments.</p>

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A systematic review of green IoT technologies, communication protocols, security challenges, and applications in smart cities

  • Sayeed Salih,
  • Aisha Hassan Abdalla Hashim,
  • Omayma Husain,
  • Abdelzahir Abdelmaboud,
  • Abdelwahed Motwakel,
  • Hashim Elshafie,
  • Mosab Hamdan

摘要

The rapid urbanization and the increased need for sustainability have placed the Green Internet of Things (G-IoT) at the center as the key driver of green smart cities. In this paper, a systematic literature review (SLR) of G-IoT technologies and strategies applied in urban settings is provided following PRISMA guidelines. Integrating 130 studies from 2015 to 2025, the review consolidates findings across three interconnected areas: energy-saving technology, communication protocols, and security concerns with corresponding countermeasures. Structuring these findings, the study proposes a three-category technology model and a three-layer security framework. The review highlights the most recent advances, trade-offs, and contextual suitability of G-IoT solutions while identifying gaps that require further investigation. With the merging of these perspectives, the review presents a comprehensive understanding of G-IoT's role in improving energy efficiency, adaptability, and sustainability in smart cities as well as outlining avenues for future research towards achieving greener, adaptive urban environments.