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Thread: GGSN functions

  1. #1
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    GGSN functions

    Functions of the GMSC
    The Gateway MSC (GMSC) is the gateway of the UMTS core network with the PSTN/ISDN
    for circuit-switched services.
    For mobile terminating services the Home Location Register (HLR) is interrogated for
    information how to route and process the call further.
    2.1.3 Functions of the GGSN
    The GGSN is the gateway of the UMTS PLMN towards the external packet data network
    (PDN). It is able to access Internet based networks of several service providers (ISP).
    On the other hand the GGSN forwards the packet data units (PDUs) of the external
    packet data protocols by using the tunneling protocol to the related SGSN where the
    destination user resides. Therefore the GGSN holds a GPRS specific routing table
    which is updated by the packet-switched mobility management of the 3G-SGSN. The
    information is transferred by the GTP-U. The GGSN can assign dynamic packet data
    protocol addresses.
    Access management (authentication and accounting)
    For authentication of the user in the ISP there is also an so-called non-transparent access
    to Internet (RADIUS access) which can be named as ISP authentication. In case
    of non-transparent access there is an additional authentication procedure controlled by
    the Internet operator (Internet service provider (ISP)). For this the ISP supports a RADIUS
    server and the GGSN supports a RADIUS client which is passing the user-ID and
    password.
    Session management
    Session management (SM) provides the functionality required for handling packet data
    protocol (PDP) contexts in GGSN node. SM covers the activation, modification and deactivation
    of PDP contexts.
    GGSN specifics for SM: Only for active PDPs, a context is provided in the GGSN. The
    GGSN assigns temporary PDP addresses itself or gets them from the RADIUS server
    of the Internet service provider (ISP) if no static PDP address is assigned to the PDP.

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  3. #2
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    Add the attachment of the book from where you picked this text from...will be a great help


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