Page 33 - ITU-T Focus Group IMT-2020 Deliverables

ITU-T Focus Group IMT-2020 Deliverables 2

In EPC, network-initiated QoS control is used for network to initiate the signal to set up a dedicated bearer
with a specific QoS, which is triggered by an application function or a DPI function. The signal is carried over
standardized interfaces (Rx and/or Gx). For the IMT-2020 system user-initiated QoS control is need to provide
the specific QoS parameters (e.g., maximum bit rate, guaranteed bit rate) in order to support extreme
performance requirements (e.g., ultra-low latency, ultra-high bandwidth).
The separation of control plane and user plane is expected to be one of basic principles for IMT-2020 system.
Under this condition, in order to quickly provide E2E QoS authorization, a decision-making point of QoS
control would be centralized in control plane while an enforcement point of QoS control would be distributed
in user plane.
9.9.2 Requirements

[REQ] The network architecture for IMT-2020 is required to support access-agnostic QoS control from core
network perspective.

[REQ] The network architecture for IMT-2020 is required to support E2E QoS as well as proper QoS
interworking.

NOTE – QoS interworking is being still supported in the existing networks (e.g., QoS mapping between QCI
and DSCP). When the levels of granularities between the two networks are different, aggregation may be
needed.
[REQ] The network architecture for IMT-2020 is recommended to support a finer level of QoS granularities
in order to provide service with different performance requirements.
[REQ] The network architecture for IMT-2020 is recommended to use QoS information along with other
information such as slice ID, location, etc. by session management in selecting proper UP functions.

[REQ] The network architecture for IMT-2020 is required to support an implicit and/or an explicit request of
packet forwarding treatment by network and/or user respectively.
NOTE – The packet forwarding treatment represents, for example, scheduling weights, admission thresholds,
queue management thresholds, link layer protocol configuration, etc. [b-3GPP TS 23.203] describes more
explanation in detail.
[REQ] The network architecture for IMT-2020 is required to support E2E QoS authorization by providing a
centralized QoS decision-making point and a distributed QoS enforcement point within one operator.

9.10 Context awareness

For further study.

9.11 Profile management (User, Device, etc.)
For further study.

9.12 Network management

9.12.1 Description
Multiple network management protocols in different network domains make it difficult to support unified
network operations over multiple network domains. A unified end-to-end network management should be
considered to ensure compatibility and flexibility for the operation and management of an IMT-2020
network.

The IMT-2020 network should facilitate an integrated access network management for multiple radio access
networks including WLAN and fixed access networks. The integrated multi-RAT and fixed network
management should support seamless and consistent user experience while moving across different access
networks, and also steer mobile devices to choose the most suitable access technology in a seamless way. In
addition, simultaneous multiple connections for a mobile device to multiple RATs and fixed access networks

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