Page 1350 - 5G Basics - Core Network Aspects

3 Signalling aspects

6.2.6 Reference point C6

The C6 reference point is between EF and SCF.
C6 is used to exchange service control related information between EF and SCF. For instance, registration
information or service request information.

6.2.7 Reference point C7
The C7 reference point is between RLF and SCF.
C7 is used by SCF to request resource location from RLFs.

6.2.8 Reference point C8
The C8 reference point is between RLF and EF.

C8 is used by EF to request resource location from RLF.

6.2.9 Reference point C9
The C9 reference point is between EF and CDF.
C9 is used by EF to query a buffer map and request content from CDF.

6.2.10 Reference point C10

The C10 reference point is between CDFs.
C10 is used by CDF to query a buffer map and request content from another CDF.

6.2.11 Reference point A1
The A1 reference point is between EF and CSAF.

A1 is used by EF for accessing content services and requesting content location.
6.2.12 Reference point A2

The A2 reference point is between SCF and CSAF.
A2 is used for user authentication and authorization.

6.2.13 Reference point A3
The A3 reference point is between CSAF and RLF.

A3 is used by CSAF to request RLF for the available content node.
6.2.14 Reference point A4

The A4 reference point is between AF and TOCF.
A4 is used by AF to query and subscribe the specific traffic related information.

6.2.15 Reference point A5
The A5 reference point is between CDF and CSAF.

A5 is used by CSAF to control CDF to process (e.g., transcoding, encryption) content.
The reference points are described in detail in [ITU-T Y.2080].

7 Physical entities and interfaces in DSN architecture
When implementing a DSN architecture, some of the functions identified in [ITU-T Y.2080] may be grouped
and implemented in a number of PEs. The PEs and protocols used on the interfaces may be different when
deploying different application services over DSN. For example, the PEs and protocols used for content

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