举例:GSM网络构成 Um Abis Base ME transceiver station VLR AuC EIR HLR SIM B Base station Mobile Mobile transceiver Acontroller Operation and station station switching maintenance center center Base station susbystem Data communication ME network Network susbvstem SIM Mobile !!!II station AuC Authentication Center EIR Equipment identity register PSTN HLR Home location register ME Mobile equipment PSTN Public switched telephone network SIM Subscriber identity module VLR Visitor location register举例：GSM 网络构成