Link power coordination for energy conservation in complex communication networks

TL;DR

This paper investigates link power coordination schemes in complex communication networks to enhance energy efficiency, revealing topology-dependent effectiveness and proposing a hybrid scheme for scale-free networks.

Contribution

It introduces and compares multiple link power coordination schemes, highlighting their performance variations across different network topologies and proposing a hybrid scheme for improved energy savings.

Findings

Energy savings depend on network topology.

LBF scheme causes phase transition in scale-free networks.

SBF scheme outperforms others in real ISP topology.

Abstract

Communication networks consume huge, and rapidly growing, amount of energy. However, a lot of the energy consumption is wasted due to the lack of global link power coordination in these complex systems. This paper proposes several link power coordination schemes to achieve energy-efficient routing by progressively putting some links into energy saving mode and hence aggregating traffic during periods of low traffic load. We show that the achievable energy savings not only depend on the link power coordination schemes, but also on the network topologies. In the random network, there is no scheme that can significantly outperform others. In the scale-free network, when the largest betweenness first (LBF) scheme is used, phase transition of the networks' transmission capacities during the traffic cooling down phase is observed. Motivated by this, a hybrid link power coordination scheme is proposed to significantly reduce the energy consumption in the scale-free network. In a real Internet Service Provider (ISP)'s router-level Internet topology, however, the smallest betweenness first (SBF) scheme significantly outperforms other schemes.