Page 92 - ITU-T Focus Group IMT-2020 Deliverables

3 ITU-T Focus Group IMT-2020 Deliverables

Following is the nature of the functionality supported by the NFs in the reference architecture.

– Subscriber DB (SDM): Management of subscription profile.
– SM Control Function (SMCF): Allocation of UE IP address, User plane function selection,
enforcement of policy and charging rules, etc. The exact set of functionality will be based on the
conclusion of key issues 2, 3, 4, 6.
– MM Control Function (MMCF): Terminates control plane interface, NG2, from the Access Network
carrying both access specific and access common information. Also terminates the NG1 interface.
Performs access specific, e.g. UE reachability management, mobility restriction, etc., and access
common, e.g. UE registration management, etc., functionality. The exact set of functionality will be
based on the conclusion of key issues 1, 2, 3, 4, 18.
NOTE 1 – Generic name needs to be used to reflect the fact that MMCF is common to all accesses.
– Policy Function (PF): Provides dynamic policies for QoS enforcement, charging control, traffic
routing, etc. The exact set of functionality will be based on the conclusion of key issue 10.
– Application Function (AF): Requests dynamic policies and/or charging control.
– Authentication Function (AUF): Performs authentication process with the UE. The exact set of
functionality will be based on the conclusion of key issue 12.
– User-plane Function(s) (UPF): Supports user-plane operations (forwarding to other user-plane
functions/a data networks/the control-plane, bitrate enforcement, service detection, etc.). Multiple
user-plane functions per session can be activated and configured by the control-plane as needed for
a given user-plane scenario. The exact set of functionality will be based on the conclusion of key
issue 4.

6.1.1.3.2 Consolidated architecture option 2
(Source: China Mobile, etc.)

Figure 6.1.1-12 – Non-Roaming reference Architecture

The NextGen architecture consists of the following functions:
NG Core Control Plane functions (NG-CP):
– Authentication & Authorization

– Mobility Management
– Session Management
– Policy Control
– Charging Management (control part of enforcement of charging)

86