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2G 3G 3GPP 4G 5G attach BSC CG EPS Bearer Gb interface GGSN Gn interface GPRS GPRS attach GPRS mobility management GPRS network GPRS network architecture Gs interface GSM GTP HLR idle state LTE MM state mobile core engineer mobile network MSC association PDN PDP PDP context PDP context activation PLMN PMM-CONNECTED state PMM-DETACHED state PMM-IDLE state PS core engineer PS signaling connection ready state RNC service request SGSN standby state telecommunication jobs UMTS user plane