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    Overview of Broadband Gateway Downlink Payload Packet Flow

    The MobileNext Broadband Gateway uses interface Modular Port Concentrators (MPCs) or Dense Port Concentrators (DPCs) to handle all downlink user payload packets flows requests from an IP network back to the user equipment. All user traffic flows through the anchor interface MPC or DPC. In this example, the mobile and packet network interfaces are all housed in MPCs.

    Figure 1: Broadband Gateway Downlink User Packet Flow

    Broadband Gateway Downlink User Packet
Flow

    After the GPRS tunneling protocol, control (GTP-C) packets establish a session, and packets flow uplink to the broadband gateway, Figure 1 shows the last four steps that the downlink user payload GTP user plane (GTP-U) packets take through the broadband gateway:

    • 9. The IP network sends a downlink data packet to a mobile Gi or SGi interface on the broadband gateway.
    • 10. The interface MPC sends the downlink packet to the interface MPC chosen during the control phase to anchor the user session data flow. The anchor MPC performs all subscriber-specific access control, policing, statistic gathering, and other parameters set for the subscriber.
    • 11. The anchor interface MPC sends the encapsulated GTP-U packet to the downlink interface that leads to the correct user device.
    • 12. The downlink interface MPC sends the GTP-U user payload packet to the user device.

    Published: 2011-11-18