2 research outputs found
Information-Theoretic Study of Time-Domain Energy-Saving Techniques in Radio Access
Reduction of wireless network energy consumption is becoming increasingly
important to reduce environmental footprint and operational costs. A key
concept to achieve it is the use of lean transmission techniques that
dynamically (de)activate hardware resources as a function of the load. In this
paper, we propose a pioneering information-theoretic study of time-domain
energy-saving techniques, relying on a practical hardware power consumption
model of sleep and active modes. By minimizing the power consumption under a
quality of service constraint (rate, latency), we propose simple yet powerful
techniques to allocate power and choose which resources to activate or to put
in sleep mode. Power consumption scaling regimes are identified. We show that a
``rush-to-sleep" approach (maximal power in fewest symbols followed by sleep)
is only optimal in a high noise regime. It is shown how consumption can be made
linear with the load and achieve massive energy reduction (factor of 10) at
low-to-medium load. The trade-off between energy efficiency (EE) and spectral
efficiency (SE) is also characterized, followed by a multi-user study based on
time division multiple access (TDMA)
Energy-Sustainable IoT Connectivity: Vision, Technological Enablers, Challenges, and Future Directions
Technology solutions must effectively balance economic growth, social equity,
and environmental integrity to achieve a sustainable society. Notably, although
the Internet of Things (IoT) paradigm constitutes a key sustainability enabler,
critical issues such as the increasing maintenance operations, energy
consumption, and manufacturing/disposal of IoT devices have long-term negative
economic, societal, and environmental impacts and must be efficiently
addressed. This calls for self-sustainable IoT ecosystems requiring minimal
external resources and intervention, effectively utilizing renewable energy
sources, and recycling materials whenever possible, thus encompassing energy
sustainability. In this work, we focus on energy-sustainable IoT during the
operation phase, although our discussions sometimes extend to other
sustainability aspects and IoT lifecycle phases. Specifically, we provide a
fresh look at energy-sustainable IoT and identify energy provision, transfer,
and energy efficiency as the three main energy-related processes whose
harmonious coexistence pushes toward realizing self-sustainable IoT systems.
Their main related technologies, recent advances, challenges, and research
directions are also discussed. Moreover, we overview relevant performance
metrics to assess the energy-sustainability potential of a certain technique,
technology, device, or network and list some target values for the next
generation of wireless systems. Overall, this paper offers insights that are
valuable for advancing sustainability goals for present and future generations.Comment: 25 figures, 12 tables, submitted to IEEE Open Journal of the
Communications Societ