6G Networks: High-Density Networks Require More Energy and
Better Energy Management
Mobile communication
networks are notoriously power-hungry. Future 6G networks will be “a
complex ecosystem of densely deployed software and hardware components,”
according to a 2023 German whitepaper. This will include the incorporation of
AI capabilities. Of specific concern are the energy consumption and energy
efficiency of 6G networks.
Radio access networks (RAN)
account for most of the 6G energy requirements, 73% according to the German
whitepaper. Power costs account for between 20% and 40% of the operating
expenses of network operators. The newer data-heavy networks make lowering
energy costs the prime driver of innovation, which was not the case for
previous networks. It is simply that higher data consumption means higher
energy consumption and higher operational costs. 3G and 4G networks focused
more on enhancing user experience through faster speeds and broader coverage.
5G networks began to address energy consumption, but there is much more to be
done. Energy efficiency needs to be embedded from the outset.
According to an article in
ICT Networks:
“Despite technological advancements such as improved
power amplifiers and faster base station wake-up times, the annual growth in
data demand—estimated at around 2.8%—continues to outpace efficiency gains.
This imbalance means that even incremental improvements in hardware and
software are insufficient to curb overall power usage. For 6G, this reality
serves as a wake-up call, pushing standardization bodies like 3GPP and industry
leaders to treat energy as a core design constraint.”
The need for computational
power and dense network deployments in more sophisticated modern applications
means higher power use is a given. This has created a tension between
performance and energy consumption, which needs to be addressed. Autonomous
systems and AI processing require ultra-low latency, massive connectivity, and
high reliability. There is a need to develop smarter algorithms and hardware
optimizations that prioritize efficiency. IOT and smart grids require dense
networks that can adapt dynamically, and doing that while maintaining energy
efficiency is challenging. Thus, scaling up these 6G networks without much
higher energy consumption is a hurdle that must be overcome.
Emerging solutions include
technological innovations across network architecture. The article in ITC
Networks gives four strategies: technological innovations, industry and
academic collaborations, embedding efficiency from the outset, and reflecting
on past efforts to address their energy efficiency failures. Regarding
technological innovation, it is noted:
“Strategies such as lean network designs aim to
eliminate unnecessary transmissions across time, spatial, and frequency
domains, while energy-efficient air interfaces and waveforms are being
developed to optimize signal transmission. Additionally, user equipment
(UE)-assisted algorithms for power saving, synchronized sleep modes for
downlink (DL) and uplink (UL), and dynamic resource allocation are gaining
traction. The integration of AI and ML into network operations further enhances
efficiency by enabling predictive management of resources, ensuring that energy
is used only when and where it is needed.”
Standardization bodies like
3GPP can play an important role in industry/academic collaborations by setting
up frameworks that prioritize efficiency.
“Industry stakeholders focus on practical
implementations, such as base station sleep modes and cost-effective
infrastructure upgrades, driven by the need to reduce total cost of ownership.
Meanwhile, academia explores cutting-edge concepts like novel waveforms and
advanced interference management, pushing the boundaries of what’s possible.
This synergy ensures a comprehensive approach, embedding energy-conscious
principles into every aspect of 6G development.”
Embedding efficiency from the
outset is a firm requirement. However, it may require redesigning some system
elements.
Past efficiency failures
involved the inability to predict the level of future data demands. This must
be avoided in designing the new networks. Setting up pilot projects and
standardization of power-saving protocols will be needed to test 6G networks.
5G networks incorporated some
energy-saving features for both user equipment (UE) and base stations (BSs),
but many were added later, after the networks were deployed. 5G energy saving
innovations include introducing specific low-power modes during idle times,
including idle mode signaling reduction and discontinuous reception (DRX). The
other 5G power saving innovations are described below from a Samsung blog
article:
“5G introduced both short and long DRX cycles to strike
a balance between latency and energy efficiency. Complementing DRX,
Discontinuous Transmission (DTX) enables BSs to skip transmissions during
periods of low or no traffic, further conserving energy. Additionally, Carrier
Aggregation allows for the selective activation or deactivation of secondary
carriers, optimizing energy use by ensuring resources are only utilized when
necessary. Together, these mechanisms collectively contribute to significant improvements
in energy efficiency across 5G networks.”
Below, they list more
power-saving features of later releases of 5G networks.
Energy and network management
for 6G has been deemed “energy performance,” according to an Ericson white
paper, and such innovations often require a new generation format.
“Some solutions, such as those related to UE idle-mode
functions like system-information broadcast, random-access, and paging can only
be changed when a new generation is introduced.”
“For 6G, we need to ensure that we can benefit, in terms
of reduced network energy consumption, from deployment architectures where RAN
processing is more centralized.”
They also note that lean
design features have been successful in 5G NR and should be further developed
in 6G networks.
“The introduction of lean design in 5G NR, which focuses
on minimizing transmissions not related to data transfer, has been a tremendous
success enabling large network energy savings due to micro-sleep between
transmissions. For 6G, we should continue to build on the lean design success
story and do more of what has proven to work well in 5G.”
As shown below, lean design
can be incorporated in the time, space, and frequency domains into new 6G
networks.
They note that the lean
design features of 5G NR were very successful and can be further developed in
6G.
New Paper Models Synthetic Biology-Based Fuel Cell-Powered
Bio-Hybrid Networks as a Sustainable Alternative for Ultra-Dense Small-Cell
Base Stations
A December 2025 paper
published in the journal Scientific Reports explores the possibility of
synthetic biology-based fuel cell-powered networks as a sustainable alternative
for ultra-dense small-cell base stations. As noted in the abstract:
“Simulation results indicate that bio-hybrid systems can
achieve reliable energy autonomy, significantly reducing reliance on
centralized power grids while simultaneously lowering emissions.”
Incorporating these biohybrid
systems into ultra-dense networks has some security and ethical challenges.
These include cyber–physical vulnerabilities and public acceptance. The
microbial bioreactors need to be free of tampering concerns.
AI-driven power balancing is
incorporated into these systems. Control and optimization frameworks employ
model predictive control, described below:
“Model Predictive Control (MPC) provides an anticipatory
mechanism by leveraging system dynamics to optimize inputs such as substrate
feeding and storage switching over a finite horizon, making it particularly
effective under fluctuating microbial performance and forecasted load
conditions. Adaptive neural controllers, including deep recurrent architectures
like LSTMs, capture temporal dependencies in bioenergy generation and predict
short-term variations, enabling proactive energy balancing. In addition, hybrid
rule-based and AI frameworks combine hard-coded safety constraints, such as
minimum biofilm health thresholds, with data-driven optimization, ensuring
interpretability without sacrificing adaptability.”
Below are some graphs from
the paper that show that the increased energy demands of 6G networks consist
of their total transmission and computational needs, which are based on the
number of devices.
As noted in the paper’s
conclusions below, these systems are powered by “microbial fuel cells and
enzyme-driven energy systems.” However, at present, they only exist as
simulations. Field trials and experimental validation will be the next step.
References:
Bio-hybrid
6G networks with synthetic biology-enabled base stations for energy-autonomous
telecommunications. Abdulrahman Al Ayidh, Mohammed M. Alammar, Mohamed Abbas,
Muneer Parayangat & Abdullah Alharthi. Scientific Reports volume 15,
Article number: 43784 (December 15, 2025). Bio-hybrid 6G networks with synthetic
biology-enabled base stations for energy-autonomous telecommunications |
Scientific Reports
How
Will 6G Networks Balance Energy and Innovation? ITC Network. June 6, 2025. ITCnetwork publications
Energy
Performance of 6G Radio Access Networks: A once in a decade opportunity. Ericsson.
White PaperGFTL-24:001335. November 2024. 6g-energy-performance.pdf
Energy
Saving for 6G Network: Part I. July 8, 2025. Hyoungju Ji, Younbum Kim, Hongbo
Si, and Aris Papasakellariou. Samsung. Blog. BLOG | Samsung Research
Sustainability
of 6G: Ways to Reduce Energy Consumption. Hecker, Artur, Bernardos, Carlos
Jesus Gavras, Anastasius Schörner, Karsten Bou Rouphael, Rony AL-Naday, Mays, Lombardo,
Chiara, Ghoraishi, Mir. Zenodo. 6G Infrastructure Association. October 24,
2024. Sustainability of 6G: Ways to Reduce
Energy Consumption
6G
Energy Efficiency and Sustainability. Fraunhoffer IIS. 6G Platform Germany.
January 2023. Whitepaper6GSustainability.pdf
From
Efficiency to Sustainability: Exploring the Potential of 6G for a Greener
Future. Rohit Kumar, Saurav Kumar Gupta, Hwang-Cheng Wang, C. Shyamala Kumari, and
Sai Srinivas Vara Prasad Korlam. Sustainability. 2023, 15(23), 16387. November 27,
2023. From Efficiency to Sustainability:
Exploring the Potential of 6G for a Greener Future | MDPI






























