What is CSS (CSG subscriber server)?

The CSG subscriber server saves essential data for roaming subscriber’s CSG access in the VPLMN, for each roaming endorser requesting access in a CSG where the function is upheld and permitted. CSG provision by the CSG manager is done by dealing with the list of users per CSG and access the function of how to oversee CSG data in UE. At the point when a CSG subscription is dropped, it should be managed as a terminated subscription in HSS subscription information to permit the execution of the appropriate procedure so it is eliminated from UE’s Allowed CSG list or Operator CSG list first.