Page 30 - ITU-T Focus Group IMT-2020 Deliverables

2 ITU-T Focus Group IMT-2020 Deliverables

[REQ] The network architecture for IMT-2020 is required to support a unified end-to-end network
management to ensure compatibility and flexibility for the operation and management of an IMT-2020
network.
NOTE – Various network management protocols in different network domains make it difficult to support
unified network operations over multiple network domains.

[REQ] The network architecture for IMT-2020 is required to support standard OAM protocols for fault
management and performance management between network equipment which may be commonly used
across the IMT-2020 network.
NOTE – OAM protocols are not standardized in some parts of IMT networks such as fronthaul network.

9.3 Enhanced mobility management
9.3.1 Description

IMT-2020 should support a wide range of mobility options. Only around 30 % of total subscribers are actually
mobile even in the current IMT networks according to some of MNOs’s observation. Therefore, IMT-2020
should not assume the same mobility support for all devices and application services but rather provide
mobility on demand only to those that need it. While mobility is not required for some stationary devices
such as smart meters and CPE devices, but we also need to provide mobility for high-speed trains running at
500 km/h. Another mobility scenario to account for is when the RAN itself (UEs and base station) is mobile
such as on a ship or plane. The service continuity levels also vary: seamless mobility, nomadic mobility,
mobility for sporadic transmission, etc.

9.3.2 Requirements

[REQ] The network architecture for IMT-2020 is required to support enhanced mobility management such as
“context-aware mobility” considering device types, application characteristics, etc.

NOTE 1 – It is expected that mobility requirements for user devices will be variable depending on the device
and/or application types. Many user devices are stationary, e.g., smart meters and CPE, even in mobile
networks while fast handover is a key feature of most mobile devices and some applications may address the
mobility by setting up a new connection automatically with the help of buffering.

NOTE 2 – The signaling procedure in the existing IMT networks is heavy and not optimized for some of
emerging new services such as IoT.

[REQ] The network architecture for IMT-2020 is required to support the mobility management aligning with
those architectural changes that the IMT-2020 core network is envisioned to be a flat distributed network
which is composed of the multiple distributed gateways to cope with traffic explosion and latency
requirements of applications.
[REQ] The network architecture for IMT-2020 is required to 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.

9.4 Scalable and incremental installations

9.4.1 Description
It is cost effective to add on only that which is need in the location and capacity.

9.4.2 Requirements
[TBD]

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