Major Functional Components of an SCEF Network

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:

Figure 1-2 SCEF/MTC-IWF functionality at DSR

• 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