Section: 12.3.4 APN level overload control 12.3.4.1 General
Content: APN level overload control refers to advertising of the overload information at APN level granularity and hence applying the mitigation policies based on this information to the signalling traffic related to this APN only. Only a PGW may advertise APN level overload information when it detects overload for certain APNs, e.g. based on shortage of internal or external resources for an APN (e.g. IP address pool). NOTE: When all the internal and external resources, applicable to the APNs, are available for all the APNs served by a PGW, the node level overload information is exactly the same as APN level overload information of that PGW, for each of its APNs, and hence, performing node overload control can be sufficient.