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    GTP Versions and GPRS Interfaces Overview

    The General Packet Radio Service (GPRS) tunneling protocol (GTP) is used to tunnel GTP packets through 3G and 4G networks. A MobileNext Broadband Gateway configured as a gateway GPRS support node (GGSN), Packet Data Network Gateway (P-GW), or GGSN/P-GW automatically selects the appropriate GTP version based on the capabilities of the serving GPRS support node (SGSN) or Serving Gateway (S-GW) to which it is connected.

    Figure 1 shows the GTP versions that the broadband gateway supports.

    Figure 1: GTP Versions Supported on a MobileNext Broadband Gateway

    GTP Versions Supported on a MobileNext
Broadband Gateway

    GTP is the primary protocol used in a GPRS core network and allows users in a 3G or 4G network to move from one location to another while remaining connected to the Internet as if from one location at the GGSN or P-GW by carrying user traffic from the user’s current SGSN or S-GW to the GGSN or P-GW that handles the user’s session.

    Figure 2 shows the GTP-C versions the broadband gateway supports for the 3G and 4G network interfaces.

    Figure 2: GTP-C Versions Supported for 3G/4G Network Interfaces

    GTP-C Versions Supported
for 3G/4G Network Interfaces

    For 3G networks, a broadband gateway uses GTP v0, or GTPv, or both to transport GTP packets on the GPRS interfaces:

    • Gn—The Gn interface is the connection between an SGSN and a GGSN within the same public land mobile network (PLMN).
    • Gp—The Gp interface is the connection between two PLMNs.

    Note: GTPv1 is used for both GTP-C and GTP-U. The GTPv1-C protocol runs on UDP port 2123. The GTPv1-U protocol runs on UDP port 2152.

    For 4G networks, a broadband gateway uses GTP v2 to transport GTP packets on the GPRS interfaces:

    • S5—The S5 interface is the connection between an S-GW and a P-GW within the same PLMN.
    • S8—The S8 interface is the connection between two PLMNs.

    Note: The GTPv2 protocol is a control-only protocol and runs on UDP port 2123.

    Published: 2011-11-17