Page 485 - 5G Basics - Core Network Aspects

Core network aspects 1

The TAA-FE obtains these mobility service parameters from an AAA entity in the mobile subscriber's home
network. The means by which the TAA-FE determines that mobility service is to be provided and that mobility
service parameters are required is out of scope of this Recommendation.
The contents of the "indication of host-based mobility" primitive are shown in Table 1.

Table 1 – Indication of host-based mobility (TLM-FE → MLM-FE(P))

Information element Explanation
Transport subscriber identifier The user/UE identifier authenticated for attachment.
(optional) (Note)
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.
Persistent IP address information A set of IP address information used for locating the mobile UE.
(optional) (Note)
– Unique IP address The persistent IP address allocated to the attached mobile UE.

– Address realm The addressing domain in which the IP address is significant.
Keying material The material used for the security association between the UE and MLM-
FE(P).
RACF contact point (optional) The FQDN or IP address of the RACF entity where the resource requests
are required to be sent (i.e., PD-FE address).
Anchor point address (optional) The upper tunnel end point address, from the point of view of the UE.
NOTE – Either the UE identifier or the persistent IP address must be present.

6.5.1.2 Indication of network-based mobility
The information transferred in the case of network-based mobility includes the identifier or persistent
address, the address of the MLM-FE(C) instance for this connection, and may include the lower tunnel end
point address and other parameters relating to mobility service. The "indication of network-based mobility"
primitive is shown in Table 2.

When the TLM-FE indicates network-based mobility service to the MLM-FE(P), this indication will trigger the
mobile location registration procedure, and indirectly trigger handover.

Table 2 – Indication of network-based mobility (TLM-FE → MLM-FE(P))

Information element Explanation

Transport subscriber identifier The user/UE identifier authenticated for attachment.
(optional) (Note 1)
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.
Persistent IP address information A set of IP address information used for locating the mobile UE.
(optional) (Note 1)
– Unique IP address The persistent IP address allocated to the attached mobile UE.
– Address realm The addressing domain in which the IP address is significant.
Address of MLM-FE(C) The address of the instance of the MLM-FE containing the mobile
address binding information.
Tunnel end-point address (optional) The tunnelling end point address for the network node which works as
(Note 2) UE's proxy (lower tunnel end point).

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