DSR implements the functionality of both SCEF and MTC-IWF
network elements. SCEF/MTC-IWF functionality at DSR can be split into two
functional components as depicted in
Figure 1-2:
- The
API Gateway
provides the northbound interface between SCEF and Services Capability
Server/Application Server (SCS/AS) based on a T8 interface. The T8 APIs are a
set of RESTful APIs defining the related procedures and resources for the
interaction between the SCEF and the SCS/AS.
- The
Core SCEF/MTC-IWF
provides southbound interface toward core network elements like HSS, MME/SGSN
(Serving GPRS Support Node ), and Policy and Charging Rules Function (PCRF).
The following MTC call procedures are implemented at the core SCEF/MTC-IWF
component with DSR acting as SCEF and MTC-IWF network elements:
- Device triggering
function (MTC-IWF functionality)
- Non-IP data delivery
- Monitoring event
- Enhance coverage
restriction control