Page 489 - 5G Basics - Core Network Aspects

Core network aspects 1

Table 10 – UE handover decision request (UE → HDC-FE)

Information element Explanation

Mobility service subscriber identifier The user/UE identifier authenticated for mobility services. This will be
the same as the transport subscriber identifier in the integrated scenario.
Target access point Identifies the target access point selected by the network.
Target network information Information about the target network to assist the mobile node to
perform a handover.
Handover execution delay (Optional) The amount of time (in ms) to elapse before an action needs to be taken.
(Note) A value of 0 indicates that the action is taken immediately. Time elapsed
is calculated from the instant the command arrives until the time when
the execution of the action is carried out.
NOTE – May be present if the network has previously been identified as the triggering entity.

Table 11 – UE handover decision response (HDC-FE → UE)

Information element Explanation

Status One of: handover not possible, ready to trigger, awaiting trigger.
Handover execution delay (Optional) The amount of time (in ms) to elapse before an action needs to be taken.
(Note) A value of 0 indicates that the action is taken immediately. Time elapsed
is calculated from the instant this response arrives until the time when
the execution of the action is carried out.

NOTE – May be present if the UE has previously been identified as the triggering entity and status is "awaiting
trigger".

6.5.5 Reference point M5 between UE and NID-FE
This information flow is used to carry information needed to make the handover decision from the NID-FE to
the UE when the UE is the entity that makes the handover decision. Reference point M5 supports two
primitives:
• access network information query (Table 12);
• access network information query response (Table 13).

Note that these are the same primitives supported across reference point M11 (HDC-FE  NID-FE, Tables 23
and 24).

Table 12 – Access network information query (UE → 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.

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