How it Works

This section describes how this feature works.

cnSGW-C invokes the DDN procedure in the following scenarios:

  • A session rapidly moves to the idle state causing the Uplink and Downlink data to trigger simultaneously.

  • When a subscriber is in the idle state and the Downlink data is received, cnSGW-C sends a DDN to MME. The DDN notifies MME to page the UE and change the UE state to active.

  • When a subscriber is in the idle state and the Uplink data is received, the MME sends a Modify Bearer Request to SGW to change the UE state to active.

  • If the SGW service has initiated DNN and it receives the Modify Bearer Request, the service aborts the DDN procedure and processes the Modify Bearer Request to change the UE state to active.