In terms of protecting the Diameter servers, including HSS, in a LTE or IMS network, that's the prime job of the Diameter signaling controller. The DSC addresses network overload conditions, protecting the servers that can't protect themselves. They can also load balance across HSS farms and provide subscriber profile routing (matching the subscriber to the right HSS).
Using DSCs, service providers can also create a geographically redundant network with dispersed HSS servers to provide uptime in the event of data center failure.
In terms of protecting the Diameter servers, including HSS, in a LTE or IMS network, that's the prime job of the Diameter signaling controller. The DSC addresses network overload conditions, protecting the servers that can't protect themselves. They can also load balance across HSS farms and provide subscriber profile routing (matching the subscriber to the right HSS).
Using DSCs, service providers can also create a geographically redundant network with dispersed HSS servers to provide uptime in the event of data center failure.