G网4G演进路线:GSM->GPRS->EDGE->WCDMA->UMTS->HSPA->HSPA+->LTE->LTE_ADVANCE
GSM->GPRS->EDGE->TD_SCDMA->TD_HSPA->TD_LTE
C网4G演进路线:CDMA->CDMA2000 1x->EVDO Rel.0->EVDO Rel.A->EVDO Rel.B->LTE
其他4G标准:WiMax