Page 34 - ITU-T Focus Group IMT-2020 Deliverables

2 ITU-T Focus Group IMT-2020 Deliverables

should be supported to increase user experienced data rate through the integrated management of multi-
RAT and fixed access networks.

OAM protocols are not standardized in some parts of IMT networks such as the front haul network. Standard
OAM protocols should be studied for fault management and performance management between network
equipment that may be commonly used across the IMT-2020 network.

9.12.2 Requirements
[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.

[REQ] The network architecture for IMT-2020 is required to support an integrated access network
management for multiple radio access networks including WLAN and fixed access networks.

[REQ] The network architecture for IMT-2020 is required to support standard OAM protocols for fault
management and performance management between network equipment that may be commonly used
across the IMT-2020 network.

9.13 Accounting and Charging

9.13.1 Description

Charging is one of the important necessary functions for the network and service providers. The charging
requirements of IMT-2020 network are expected to be similar to existing networks such as NGN, 3G and LTE
etc., and the architecture of IMT-2020 should be taken into account to collect charging data.
There are various charging models that need to be taken into account to design architecture of IMT-2020
network to support different charging policies and requirements of the network operators and service
providers including third party service providers. To meet requirements of third party service providers such
as MVNO, charging function to provide charging data to third party would be required. The function for
providing charging data can be realized as an open API for third party and it will be one of the capability
exposure feature of IMT-2020 network.
The charging models includes volume based charging, time based charging, session based charging,
application based charging, and no charging, etc. Also, it may possible to provide combined charging model
that consists of each charging model (e.g., time and volume based charging).

Also, charging capability for IMT-2020 network needs to be applied to each network slice independently.
Different charging model can be applied to each network slice at the cost of complexity.
9.13.2 Requirements

[REQ] The network architecture for IMT-2020 is required to provide charging function that supports online
or offline charging.

[REQ] The network architecture for IMT-2020 is required to support various charging models based on the
charging policy of network operators and/or service providers.

NOTE – The charging models includes volume based charging, time based charging, session based charging,
application based charging, no charging, and combined charging, etc.

[REQ] The network architecture for IMT-2020 is recommended to provide charging function that hand over
charging data to third party.

NOTE – If charging function to hand over charging data is supported, it will be realized as an open API for
third party that is one of network capability exposure features of IMT-2020 network.

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