부산대학교 도서관

A method for saving energy in operating first and second mobile communication networks by invoking an energy saving operational mode of the first and second mobile communication networks includes: operating a first radio access network in a first operational mode for peak time usage of the first mobile communication network, and in a second operational mode for off-peak time usage of the first mobile communication network; and invoking, at least partly during off-peak time usage of the first and second mobile communication networks, the energy saving operational mode of the combination of the first and second mobile communication networks such that the first radio access network is operated in the second operational mode while the second radio access network is operated such that coverage and capacity requirements in a geographic area are ensured by the combination of the first and second mobile communication networks.