Telecom I+D03 - Estudio del Caso de Uso SON “Ahorro de Energía” para eNBs de LTE (Telecom I+D03 - SON Use Case Study “Energy Saving” for LTE eNBs)

Emilio Mino Diaz (, Esther Torrecilla Márquez (, Luis Miguel del Apio Recio (, Ignacio Berberana Fernández de Murias (

Grupo de Acceso Radio de Telefónica I+D
This paper appears in: Revista IEEE América Latina

Publication Date: April 2010
Volume: 8,   Issue: 2 
ISSN: 1548-0992

The 3GPP is defining a next generation radio access network called LTE (Long Term Evolution), which introduces several improvements respect current mobile systems, one of them are self-organization and self-optimization functions (SON) in base stations (eNB) and O&M subsystem, that suppose a considerable increase on the network “intelligence”. This paper discusses the application of a SON function, Energy Saving, and evaluates the energy savings and system performance, when applied. To illustrate the effect of the energy saving techniques, several simulations have been carried out with a radio-planning tool in a real mobile network deployment. Two technical approaches have been followed: switching off cells and reducing the eNB transmitted power (TXP). For both approaches a reference scenario with 18 eNBs (with 54 cells) has been selected. This scenario reflects a dense urban area with a Manhattan like distribution, in an area of 2 km x 2 km, with an average ISD of 250 m. A 2x2 MIMO antenna configuration has been used in all simulations. eNB's transmitted power was 46 dBm, the operation frequency was 2 GHz and the bandwidth was 5 MHz. The Energy Saving is a promising SON Use Case that allows decreasing operator's energy costs, carbon footprint, and the radiation emitted by fixed infrastructure of the mobile telephony systems, such as base stations antennas.

Index Terms:
Energy saving, SON, eNB, LTE.   

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