The Evolution Solutions of GSM Network to 3rd Generation Mobile Communications System Liu Quan Yang Guangxin Gao LuThis paper gives the characters and network struc ture of 3G mobile communications system. By giving the comparison of GSM and 3G system it also analysis two possible projects which are based on GSM and CDMA fo r the evolution to 3G mobile communications system.rd generation communications system; GSM; T D-SCDMA; IMT2000