Section: 3.3 Symbols
Content: For the purposes of the present document, the following symbols apply: Gb Interface between an SGSN and a BSC. Gi Reference point between Packet Domain and an external packet data network. Gmb Reference point between GGSN and BM-SC. Gn Interface between two GSNs within the same PLMN. Go Interface between a GGSN and a PDF. Gp Interface between two GSNs in different PLMNs. The Gp interface allows support of Packet Domain network services across areas served by the co-operating PLMNs. Gs Interface between an SGSN and MSC. Iu Interface between the RNS and the core network. It is also considered as a reference point. Pk Reference Point between GGSN and Presence Network Agent. R The reference point between a non-ISDN compatible TE and MT. Typically this reference point supports a standard serial interface. S2a It provides the user plane with related control and mobility support between trusted non-3GPP IP access and P-GW. S2b It provides the user plane with related control and mobility support between ePDG and P-GW. S2c It provides the user plane with related control and mobility support between UE and P-GW. This reference point is implemented over trusted and/or untrusted non-3GPP Access and/or 3GPP access. S5 Interface between a S-GW and a P-GW within the same PLMN. S8 Interface between a S-GW and a P-GW in different PLMNs. Sgi The reference point between the EPC based PLMN and the packet data network. Sgi-mb The reference point between BM-SC and MBMS GW for MBMS data delivery. SGmb The reference point for the control plane between BM-SC and MBMS GW. T6a Reference point used between SCEF and serving MME. T6b Reference point used between SCEF and serving SGSN. Um The interface between the MS and the fixed network part in A/Gb mode. The Um interface is the A/Gb mode network interface for providing packet data services over the radio to the MS. The MT part of the MS is used to access the GSM services through this interface. Uu Interface between the mobile station (MS) and the fixed network part in Iu mode. The Uu interface is the Iu mode network interface for providing packet data services over the radio to the MS. The MT part of the MS is used to access the UMTS services through this interface.