Dear Colleagues,

Modern communications technologies, such as 5G and beyond, are moving toward supporting and connecting heterogeneous communications services in diverse scenarios. In the future, the numbers of connected sensors and machine-type communications devices are expected to grow exponentially. At the same time, due to ever-increasing data traffic and the need for tiny devices that can process a large amount of data, energy consumption and efficiency have become key concerns. For instance, various tasks in the emerging Internet of Things (IoT), including sensing, processing, and communications tasks, demand highly energy-efficient techniques and architectures. In addition, there is an urgent need to reduce greenhouse gas emissions from information and communications technology industries. Hence, it is important to carefully develop, design, and optimize energy-efficient communications strategies, while maintaining the desired quality of service.

In the above context, the goal of this Special Issue is to bring together original research contributions related to energy-efficient communications technologies for future “Beyond 5G” networks.

The key areas for this Special Issue include, but are not limited to, the following:

• Energy-efficient techniques and architectures for IoT;
• Ultra-low-power communications;
• Battery-less energy harvesting;
• Situation-aware design of communication devices;
• Machine learning for energy-efficient communications in 5G and beyond;
• Simultaneous wireless information and power transfer (SWIPT);
• Backscatter communications;
• Ambient backscatter communications;
• Reconfigurable intelligent surfaces for green communications;
• Energy-efficient receiver architectures;
• Performance modeling, evaluation, and analysis for green wireless networks.

Dr. Sanket S. Kalamkar
Dr. Shree Krishna Sharma
Guest Editors

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• energy efficiency
• green 5G/6G networks
• energy harvesting
• backscatter communications
• reconfigurable intelligent surfaces