Page 494 - 5G Basics - Core Network Aspects

1 Core network aspects

• access network information query (Table 23);

• access network information query response (Table 24).
It is assumed that the NID-FE is configured with the topological information that allows it to determine which
networks are neighbours to (and have the same access technology as) a given serving network.

Table 23 – Access network information query (HDC-FE → NID-FE)

Information element Explanation
Serving access point identifier(s) The identifiers of the access point(s) to which the UE is currently
connected.

– access point identifier Identifier of the specific access point within the serving access network.
– network identifier Identifier of the serving access network.

Table 24 – Access network information query response (NID-FE → HDC-FE)

Information element Explanation
Static neighbouring network info Static neighbouring network information (e.g., local policies, cost) for
networks neighbouring the serving network(s) specified in the original
query.

6.5.12 Reference point M12 between NID-FE and NIR-FE

The information flow through reference point M12 allows the NID-FE to retrieve the neighbouring network
information that it then provides to the UE or HDC-FE. Reference point M12 supports two primitives:
• access network information query (Table 25);

• access network information query response (Table 26).

Table 25 – Access network information query (NID-FE → NIR-FE)

Information element Explanation
List of neighbouring networks The list of identifiers of networks for which NID-FE wants access network
information.

Table 26 – Access network information query response (NIR-FE → NID-FE)

Information element Explanation
Static neighbouring network info Static neighbouring network information (e.g., local policies, cost) for
each network identified in the query.

6.5.13 Reference point M13 TLM-FE and NID-FE

This information flow provides the keying material derived from the UE authentication procedure (see
clause 7.3.2), in support of the security association required between the NID-FE and the UE. This security
association is required for the ongoing network selection and decision process subsequent to attachment.

Reference point M13 supports the "network selection key transfer indication" primitive, as shown in
Table 27.

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