With the rapid development of wireless communication technologies, legacy Equipments fail to be upgraded smoothly, require high OPEX, and the network capacity cannot meet growing service requirements. The Huawei GU Modernization Solution completes transformations from legacy OM to single OM, from single-mode to multi-mode base stations, and from TDM/ATM to all-IP transmission. This solution helps carriers reduce OPEX, improve network capacity, and achieve a smooth evolution required by new technologies.