Energy efficiency performances of selective switch OFF algorithm in LTE mobile networks

Energy efficiency is one of main challenges for the evolution of mobile networks. Many solutions have been already proposed by literature studies, and one promising technique is given by selective switch OFF schemes applied to booster cells in presence of a coverage layer. This mechanism permits to save energy by dynamically switching off redundant cells in conditions of low traffic, while maintaining the minimum QoS requested in the network. Nevertheless, in order to evaluate the real gains achievable by the operator in terms of decrease in energy consumption, these theoretical solutions should be implemented in a real network; from this point of view, ON-OFF algorithms in literature often result not suitable for a real implementation because of practical constraints and hardware capabilities of commercial equipment. The real performances of a selective switch OFF scheme have been assessed in a test bench with real eNodeB LTE in an opportune scenario of interest and with commercial terminals. Achieved gains obtained in high traffic conditions are encouraging also to open research activity in order to have future sustainable mobile communication systems.