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Signalling aspects 3

services may be different than those used for MMTel services. In this Recommendation, the physical
architectures are described based on service categories deployed over DSN.

When a PE includes several functions defined in [ITU-T Y.2080], some of the reference points between
functions may be implemented as internal interfaces.

7.1 PEs and interfaces for content services over DSN

Figure 7-1 illustrates an example of grouping functions when deploying content services over DSN.

Figure 7-1 – PEs and interfaces of DSN architecture for content services

7.1.1 Mapping functions into PEs
The mapping of functions into PEs is shown in Table 7-1.

One PE may implement several ITU-T Y.2080 functions, and some reference points between functions may
be converted to internal interfaces.

Table 7-1 – Mapping functions into PEs

Physical Entity Description Functions included

CSAF-PE Physical entity for the content Content service application function, Resource
service application function location functions, traffic optimization control
functions, management functions, etc.
SCF-PE Physical entity for the service Service control functions, resource location
control function functions
CDF-PE Physical entity for the content Content distribution and location control
delivery function functions, content delivery and storage functions
NEF-PE Physical entity for node NEFs, including authentication and authorization
enrolment functions to a new enrolling DSN node, etc.
End user Physical entity for the end-user End-user functions
function

7.1.2 Mapping reference points to interfaces
The mapping of reference points to interfaces is shown in Table 7-2.

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