DS TS 129 128 V13.5.0:2018

LTE; Universal Mobile Telecommunications System (UMTS); Mobility Management Entity (MME) and Serving GPRS Support Node (SGSN) interfaces for interworking with packet data networks and applications (3GPP TS 29.128 version 13.5.0 Release 13)

Scope

The present document describes the Diameter-based interfaces between the SCEF/IWK-SCEF and other network
entities such as MME/SGSN for the Architecture enhancements to facilitate communications with packet data networks
and applications.
In particular, this document specifies the T6a interface between the MME and the SCEF, the T6ai interface between the
MME and the IWK-SCEF, the T6b interface between the SGSN and the SCEF, the T6bi interface between the SGSN
and the SCEF and the T7 interface between the SCEF and the IWK-SCEF. The procedures over those interfaces are
defined in 3GPP TS 23.682 [2].