Page 32 - ITU-T Focus Group IMT-2020 Deliverables

2 ITU-T Focus Group IMT-2020 Deliverables

Therefore, efficient authentication mechanism and lightweight cryptography algorithm for data protection
should be considered to reduce the demands on device hardware and power consumption.

9.6.2 Requirements
[REQ] The network architecture for IMT-2020 is required to support unified authentication framework for
the different access systems with various subscriber identity types.
NOTE – The SIM/eSIM based authentication mechanisms in current IMT network need to be taken into
account but backward compatibility is not required to encourage development of efficient unified
authentication framework.

[REQ] The network architecture for IMT-2020 is required to support efficient authentication mechanism and
lightweight security algorithm for low complexity, low power consumption, and low data-rate IoT devices.

9.7 Flexible Signalling
9.7.1 Description

In the existing IMT networks, all different types of traffic are treated in a uniform procedure by a monolithic
bearer management and its accompanied signaling protocol. The characteristics of traffic are expected to
vary significantly from devices to devices and from applications to applications in IMT-2020 networks. For
example, as the number of IoT devices is expected to increase, the intermittent short burst traffic from
massive number of devices will cause signaling bottleneck. Meanwhile, a full-fledged signaling may be still
essential for the devices/applications in which the support of mobility is more critical.

9.7.2 Requirements
[REQ] The network architecture for IMT-2020 is required to support flexible signaling architecture.

9.8 Numbering, Naming and Addressing

For further study.

9.9 QoS control

9.9.1 Description
The IMT-2020 system is expected to be able to provide the required QoS for a variety of different services,
and different traffic characteristics. The services and traffic characteristics will also have differences in
performance requirements in terms of lower latency, higher data rate, and higher mobility. Furthermore,
some UEs can access more than one service simultaneously with diverse characteristics. In order to solve
these performance issues in a resource efficient manner, QoS control is able to differentiate their handling
according to service and device types.
Also, as the IMT-2020 system is expected to support multiple access technologies (e.g., New Radio
Technology, E-UTRAN, WLAN, etc.), QoS control of core network is able to be access-agnostic.
In existing EPC, QoS control only covers RAN and core network, but for the IMT-2020 system E2E QoS control
(e.g., RAN, core network, and transport network) is needed to support proper QoS interworking
(e.g., mapping QCI to DSCP) between the networks that packet travers.

Further, for existing EPC, QoS granularities in traffic treatment only covers Bearers per ADN, but for the
IMT-2020 system QoS granularities need to be finer (e.g., per-packet flow, per-aggregated packet flow, etc.)
in order to support extremely different performance requirements (e.g., ultra-low latency, ultra-high
bandwidth).
The session management function is able to provide connectivity between UE and APN by selecting UP
functions that achieve demanding user experience. Therefore, the relevant QoS information is able to be
informed for session management function to select the proper UP functions that traffic traverses.

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