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    Overview of Broadband Gateway as GGSN or P-GW

    You can configure the MobileNext Broadband Gateway as either a 3G gateway GPRS support node (GGSN) or 4G Packet Data Network Gateway (P-GW). The GGSN or P-GW is the interconnection point between the public land mobile network (PLMN) and a particular Packet Data Network (PDN) such as the Internet or a corporate intranet.

    In 3G networks, the GGSN maintains a one-to-many relationship with serving GPRS support nodes (SGSNs), which may be in either the home public land mobile network (HPLMN) or visited public land mobile network (VPLMN) for roaming subscribers. The SGSN and GGSN communicate with each other over Gn interface, which utilizes GPRS tunneling protocol, control plane (GTP-C) (version 0 and version 1) and GPRS tunneling protocol, user plane (GTP-U) for data traffic.

    In 4G networks, the P-GW maintains a one-to-many relationship with Serving Gateway (S-GW), which can be in either the home PLMN or visiting PLMN for roaming subscribers. The S-GW and P-GW communicate with each other over the S5 interface for non-roaming subscribers and S8 interface for roaming subscribers. Both S5 and S8 interfaces make use of GTP-C (version 2) for control plane and GTP-U for data traffic.

    The application framework for the broadband gateway is composed of a set of applications and protocols that interact with the external servers and provide the following configurable services for subscribers:

    • Mobile subscriber authentication with RADIUS.
    • Charging and accounting with GTP prime Charging Data Records (CDRs) generation and billing, or through RADIUS accounting.
    • Policy enforcement using local configuration.

    You configure the GGSN or P-GW for the broadband gateway as part of a unified edge configuration. The unified edge brings all mobile subscriber–related services under one structure. A unified edge gateway has its own set of parameters for AAA, charging, APNs, and so on.

    Published: 2011-11-18