Page 488 - 5G Basics - Core Network Aspects

1 Core network aspects

Table 7 – Handover candidate response (HDC-FE → UE)

Information element Explanation

Handover decision maker Indicates whether the choice of target link will be made by the network or
by the UE.
Triggering entity Indicates whether triggering will be done by the network or the UE.
Preferred access point list (Note) A list of attachment points suggesting new access networks to which
handover initiation will be considered. This may be different from the
networks that were suggested in the candidate query. The list is sorted
from most preferred first to least preferred last.
Address of NID-FE (Note) Address of the entity from which the UE may obtain static network
information for the networks under consideration.
NOTE – These parameters are included only if the handover decision maker will be the UE.

6.5.4.2 Handover decision
If the network has indicated that the network will make the handover decision, the UE waits until the network
sends a "network handover decision request" (Table 8); the UE responds by sending a "network handover
decision response" (Table 9). Conversely, if the UE is the decision maker, the network waits until the UE sends
a "UE handover decision request" (Table 10); the network responds with a "UE handover decision response"
(Table 11).

Table 8 – Network handover decision request (HDC-FE → UE)

Information element Explanation
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 UE has previously been identified as the triggering entity.

Table 9 – Network handover decision response (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.
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 network has previously been identified as the triggering entity and status is "awaiting trigger".

478