Feature Description
In a live network deployment, due to some external events, all or most of the idle sessions become active at the same time. When idle sessions become active, the UPF sends the session report request with the report type DLDR to the cnSGW-C.
When the cnSGW-C receives the session report with the report type as DLDR, the cnSGW-C sends the DDN message to page UE. To turn the UE active, the MME initiates the paging procedure for the UE. If paging is successful, the MME initiates the service request Modify Bearer Request. On delivering data to the UE, the UE initiates the Release Access Bearer Request and turns idle. This call flow increases an overall load on the system. When the entire call flow occurs for all subscribers in a short time, there’s a huge process overhead on the system.
The PFCP Session Report with the DLDR Throttling Support feature enables the cnSGW-C to limit the number of session report requests that enter the system to prevent the process overload on the system.