scope:

This document defines the protocol for Nt reference point. The Nt reference point includes Nt application and Nta application. 

The functional requirements and the stage 2 specifications of the Nt application are contained in 3GPP TS 23.203 [2]. The Nt application of Nt reference point lies between Service Capability Exposure Function (SCEF) and Policy and Charging Rules Function (PCRF), it supports the negotiation of background data transfer policy and is documented in the main body of this document.

The functional requirements and the stage 2 specifications of the Nta application are contained in clause 5.6.4.1a of 3GPP TS 23.682 [x5]. The Nta application of Nt reference point lies between SCEF and PCRF, it supports the event monitoring configuration for a group of UEs and the corresponding event reporting. The Nta application is documented in Annex A.

NOTE: Nta is a stage 3 name of Diameter Application due to extensibility rule mentioned in IETF RFC 6733 [15].