Page 492 - 5G Basics - Core Network Aspects

1 Core network aspects

Table 18 – Mobility location binding registration/update request
(MLM-FE(P) → MLM-FE(C))

Information element Explanation
Mobility service subscriber identifier The user/UE identifier authenticated for mobility services. This will be
(conditionally mandatory) (Note) 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.
– 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(P) The address of the MLM-FE instance which sends the location
registration.
NOTE – Mobility service subscriber identifier is required if persistent address is private.

Table 19 – Mobility location binding registration/update response
(MLM-FE(C) → MLM-FE(P))

Information element Explanation
The identifier of the subscriber for which the mobility service is to be
Mobility service subscriber identifier
provided.
Binding request result Indication of the success or failure of the binding request.

6.5.9.2 Mobility location query
In the routing optimization case (see clause 7.3.5), the MLM-FE(C) may query and obtain the mobile UE's
current binding location information through this reference point in order to pass it to the MLM-FE(C)
associated with a correspondent UE.

If a related entity (e.g., a correspondent node) requests the MLM-FE(C) to provide an indication regarding
UE's reachability, the MLM-FE(C) may send a request to the MLM-FE(P) through this reference point to get
that information. The MLM-FE(P) will send the location binding information to the related entity (e.g.,
correspondent node) via the MLM-FE(C).
Reference point M9 supports two primitives for this purpose:

• mobility location query (Table 20);
• mobility location query response (Table 21).

Table 20 – Mobility location query (MLM-FE(C) → MLM-FE(P))

Information element Explanation
Mobility service subscriber identifier The identifier of the subscriber for which the mobility service is to be
(Note) provided.

Persistent IP address information A set of IP address information used for locating the mobile UE.
(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.

NOTE – Either the mobility service subscriber identifier or the persistent address is required.

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