Dear Colleagues,

During the past decade, research and the industrial community start to invest considerable efforts in improving the energy efficiency of communication networks and systems due to energetic, economic, and environmental reasons. The energetic reasons are reflected in the number of studies according to which Information and Communication Technologies (ICT) infrastructure and computer systems consume significant amounts of world electricity consumption. The economic reasons are related to the expectations that power consumed by communication networks and systems will increase due to the necessity of satisfying constantly increasing demand for new applications, data volumes transfer and the number of user devices, which will additionally increase the energy bills of service providers. Finally, the environmental reasons are dedicated to the non-negligible contribution of the overall communication networks and systems exploitation lifecycle to the global carbon footprint, which further contributes to global warming. All indicated reasons mandate the necessity for continuation in attempts that will ensure further improvements in the energy efficiency of communication networks and systems on all layers of the open systems interconnection (OSI) model.

Therefore, this 2nd Special issue Edition is a continuation of the first successfully organized Special issue on energy-efficient communication networks and systems for Sensors journal. This Special Issue aims to serve as a platform for researchers and visionaries from academia, research labs, and industry in presenting novelties related to energy efficiency improvements of communication networks and computing systems. Sharing ideas, views, results, and experiences dedicated to improving the energy efficiency of communication networks and systems is what this Special Issue is intended to be about. Anything from theoretical and experimental achievements to innovative design and management approaches, prototyping efforts, and case studies are in the focus of this Special Issue. This Special Issue aims to open new research ways toward more energy-efficient communication networks and computing systems. The Special Issue accepts original research and review papers dedicated to the topic of improving the energy efficiency of communication networks and systems.

The broad range of topics of interest to this Special Issue include, but are not limited to, the following:

• Implementation of artificial intelligence (AI) for improving the energy efficiency of communication networks and systems;
• Techniques for improving the energy efficiency of wireless communication networks;
• Approaches for improving energy-efficiency of wireline communication networks;
• Solutions for reducing power consumption of data centers;
• Optimization of energy consumption in optical networks;
• Techniques for improving energy efficiency of fiber-wireless (FiWi) networks;
• Security and energy-efficiency trade-offs in communication networks;
• Green communication technologies for smart cities;
• Approaches based on cloud and edge computing for improving network energy efficiency;
• Network function virtualization (NFV) concepts for optimizing the energy efficiency of communication networks;
• Green future Internet and energy-efficient software-defined networking concepts;
• Energy-efficient Internet of Things/Everything (IoT/E) networks;
• Solutions for improving the energy efficiency of sensor networks;
• Improving energy efficiency with and within Unmanned Aerial Vehicle (UAV)-based networks;
• Applications of green networking technologies and principles for peer-to-peer and ad hoc networks;
• Energy-efficient underwater communications;
• Energy-efficient satellite communications;
• Energy-efficiency improvements of low-power wireless networks and devices;
• Techniques for optimizing the energy efficiency of user devices;
• Energy-efficient public health solutions;
• Green network design and energy-efficient smart grids;
• Energy-efficient vehicle communications;
• Energy-efficient automation and industrial communications;
• Energy-efficient critical communications;
• Computer and software engineering for improving energy efficiency;
• Techniques for ensuring Quality of Service (QoS) in energy-efficient communication networks;
• Green mobile applications;
• Green cognitive radio networks;
• Communication solutions for green buildings;
• Power consumption and cost models of networking infrastructure;
• Power consumption measurements and energy profiling of communication networks;
• Smart metering and data analyses for improving energy efficiency;
• Big data analyses for meeting green challenges;
• Hardware and architectural enhancements for reducing power consumption of communication network devices and systems;
• Energy-efficient management of communication networks;
• Cross-layer optimizations for reducing the energy consumption of communication networks;
• Energy-efficient algorithms, protocols, and protocol extensions;
• Energy-efficient transmission technologies;
• Energy cost models for network operators;
• Renewable energy sources for power supply of communication networks;
• Antenna design and transmission technologies for reducing energy consumption;
• Intelligent reflective surfaces for improving energy efficiency in wireless networks;
• Energy harvesting solutions and prototypes in communication networks;
• Cooperative communication systems for improving energy efficiency;
• Field trials for ensuring sustainable networking and computing;
• Standardization and regulation policy for improving the energy efficiency of communication networks;
• Performance metrics for evaluation of energy efficiency in communication networks;
• Green solutions for reduction of electromagnetic pollution;
• Solutions for power-efficient air-conditioning and cooling of communication systems and devices;
• Blockchain approaches for improving energy management of communication networks.

Dr. Josip Lorincz
Guest Editor

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• Energy-Efficient Communication Networks and Systems in Sensors (12 articles)