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Meeting SA5#51, 22 - 26 Jan 2007, Seville, SPAIN - page 3 / 8

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Gi reference

point

GPRS packet domain

network 1

GPRS packet domain

network 2

packet data

network

TE

MT

Gp

Um or

Uu

R reference

point

UE

Figure 4.1: GPRS Access Interfaces and Reference Points

There may be more than a single network interface to several different packet data networks. These networks may both differ in ownership as well as in communications protocol (e.g. TCP/IP etc.). The network operator defines and negotiates interconnection with each interconnected packet data network.

Figure 4.2 depicts the logical GPRS architecture in more detail. The GPRS Core Network functionality is logically implemented on two network elements, the Serving GPRS Support Node (SGSN) and the Gateway GPRS Support Node (GGSN), connected by a number of new interfaces between each others and the rest of the network. No inference should be drawn about the physical configuration of any network element or interface from Figure 4.2.

Note that a visited GMLC may be connected to the SGSN via the Lg reference point, this is not shown in figure 4.2. Refer to TS 32.271 [31] for further information.

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