Optimizing Energy Consumption in WDM Optical Networks through a Combined Sleep Mode and Traffic Grooming Approach: A Case Study in Ethio Telecom Optical Backbone Network
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Date
2025-06
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Addis Ababa University
Abstract
In recent years, the advancement of technologies and the increase in traffic demand
have led to rise in necessity of deploying capable and power intensive telecom networks.
To support this demand, optical backbone networks have been deployed with high resource
provisions. The aggressively increasing traffic demand and the need for the networks to
handle it, have posed a significant challenge for telecommunication sector. This research
focuses on optimizing energy utilization in optical transport network through combined
traffic grooming and sleep mode approach.
This case study is on Ethio Telecom’s optical transport network. Traffic grooming
is responsible in aggregating sub rate traffic into higher traffic line so that it will let the
line idle to be in sleep mode. This combined approach is formed through mathematical
model that account for latency and blocking probability resulted from the implementation
the combined method. The multi-objective optimization problem is developed expressing
the conflicting nature of power with latency and blocking probability through weights.
The model results in optimization in energy utilization and other optical resources,
such as line cards, wavelength, and etc. The combined framework achieves an average
energy reduction of 50 % across network nodes compared to the baseline configuration.
The energy savings at the nodal level vary and are analyzed under different weightings of
power, latency, and blocking probability. The savings are translated in monetary terms by
quantifying the reductions in energy bills and idle-card for future scalability. The proposed
method achieved optimization in energy utilization while maintaining QoS.
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Keywords
Traffic Grooming, Sleep Mode, Optimization, Energy, Resources