Symbols

Ga                          Charging data collection interface between a CDR transmitting unit (e.g. an SGSN or a GGSN) and a CDR receiving functionality (a CGF).

Gb                          Interface between an SGSN and a BSS.

Gc                          Interface between a GGSN and an HLR.

Gd                          Interface between an SMS‑GMSC and an SGSN, and between an SMS‑IWMSC and an SGSN.

Gf                           Interface between an SGSN and an EIR.

Gi                           Reference point between GPRS and a packet data network.

Gn                          Interface between two GSNs within the same PLMN.

Gp                          Interface between two GSNs in different PLMNs. The Gp interface allows support of GPRS network services across areas served by the co-operating GPRS PLMNs.

Gr                           Interface between an SGSN and an HLR.

Gs                           Interface between an SGSN and an MSC/VLR.

Iu                           Interface between the RNS and the core network. It is also considered as a reference point.

kbit/s                     Kilobits per second.

Mbit/s                    Megabits per second. 1 Mbit/s = 1 million bits per second.

R                            Reference point between a non-ISDN compatible TE and MT. Typically this   reference point supports a standard serial interface.

Reporting Area    The service area for which the location of an MS is reported.

Service Area         The location accuracy level needed for service management purposes in the 3G‑SGSN, e.g. a routeing area or a cell. The 3G‑SGSN can request the SRNC to report: i) the MS's current service area; ii) when the MS moves into a given service area; or iii) when the MS moves out of a given service area.

Um                         Interface between the mobile station (MS) and the A/Gb mode network. The Um interface is the MS to network interface for providing GPRS services over the radio to the MS.

Uu                          Interface between the mobile station (MS) and the Iu mode network. The Uu interface is the Iu mode network interface for providing GPRS services over the radio to the MS.