The present document is part of a TS-family covering the 3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Telecommunication management; as identified below:

• TS 32.391: "Delta Synchronization Integration Reference Point (IRP): Requirements".
• TS 32.392: "Delta Synchronization Integration Reference Point (IRP); Information Service (IS)".
• TS 32.396: "Delta Synchronization Integration Reference Point (IRP); Solution Set (SS) definitions".

The Itf-N interface is built up by a number of IRPs and a related Name Convention, which realise the functional capabilities over this interface. The basic structure of the IRPs is defined in TS 32.101 and TS 32.102. IRPManagers (typically Network Management Systems) and IRPAgents (typically EMs or NEs) synchronize their data concerning alarms or configuration data. In certain scenarios this synchronization is lost or not done. This IRP provides functionality to significantly reduces the amount of data which needs to be transferred in order to re-establish synchronization.

The purpose of Delta Synchronization IRP is to define an interface through which an IRPManager can request only those data which changed (i.e. changed, were created or deleted) from a synchronization point onwards. The present document is the Information Service of Delta Synchronization IRP. It defines, for the purpose of Delta Synchronization, the information observable and controlled by management system's client and it also specifies the semantics of the interactions used to carry this information.