目录1423The development of mobile communication technology What is 5G?Why do we need 5G?Research status and challenges of 5G.5FiGWi1The development of mobile communication technology Simulation of mobile communication systemDigital mobile communication systemmultimedia mobile communications systemBroadband access and distribution network system19801G2G3G4G199020062011The development of mobile communication technology 2What is 5G?AnEnglishabbrevi-ation01 An English abbreviation convergednetwork02 U
