The Internet of Things (IoT) has been envisaged to describe a number of technologies and research disciplines that enable global connectivity over the worldwide physical objects. Enabling technologies like RFID, sensor networks, biometrics, and nanotechnologies are now becoming very common, bringing the IoT into real implementations addressing varying applications, including smart grid, e-health, and intelligent transportation. They foreshadow an exciting future that closely interconnects our physical world via green networks. Green networks in IoT will contribute to reducing emissions and pollutions, exploiting environmental conservation and surveillance, and minimizing operational costs and power consumption. The Green Internet of Things (G-IoT) is predicted to introduce significant changes in our daily life and would help in realizing the vision of “green ambient intelligence.” Within a few years we will be surrounded by a massive amount of sensors, devices, and “things,” which will be able to communicate via 5G, act “intelligently,” and provide green support for users in managing their tasks. These new smart objects will also be context-aware and able to perform certain functions autonomously, calling for new forms of green communication between people and things and between things themselves, where power consumption is optimized and bandwidth utilization is maximized. This development would be relevant not only to researchers, but also to corporations and individuals alike. It is hence the aim of this special issue (SI) to focus on both theoretical and implementation aspects in green next generation networks or networks that can be utilized in providing green systems through IoT enabling technologies.

With this spirit, we are soliciting works describing both theoretical and practical research endeavors related to design, analysis, and implementation of practical sound solutions in the area of Green-IoT.

Potential topics include but are not limited to the following:

Potential topics include but are not limited to the following:

• Green Implementations and testbeds
• Green services in IoT
• Green communications
• Network architectures
• Context-aware green networks
• Opportunistic routing protocols
• Wireless relaying in IoT
• Integrated RFIDs and Sensor Networks (RSNs)
• Mobility management in green IoT
• Cognitive radios and dynamic spectrum management
• Performance evaluation in green networks
• Green and ubiquitous computing in IoT
• Cooperation in heterogeneous networks
• Federation in green IoT
• Green localization in IoT
• 5G enabling technologies for the IoT
• Device-to-Device (D2D) communications in IoT
• Cloud computing for the green IoT