Page 46 - ITU-T Focus Group IMT-2020 Deliverables

2 ITU-T Focus Group IMT-2020 Deliverables

3.2 Terms defined in this Recommendation

This Recommendation defines the following terms:
3.2.1 network function: A processing function in a network. It includes but is not limited to network nodes
functionality, e.g. session management, mobility management, switching, routing functions, which has
defined functional behaviour and interfaces. Network functions can be implemented as a network node on
a dedicated hardware or as a virtualized software functions.

3.2.2 network slice: A complete end-to-end logically partitioned network providing dedicated
telecommunication services and network capabilities. The behaviour of the network slice is realized via
network slice instance(s).

3.2.3 network slice blueprint: A complete description of the structure, configuration and the plans/work
flows for how to instantiate and control the Network Slice Instance during its life cycle.

3.2.4 network slice instance: An activated network slice. It is created based on network slice blueprint (or
template).
NOTE – A set of managed run-time network functions, and resources to run these network functions, forming
a complete instantiated logical network to meet certain network characteristics required by the service
instance(s). It provides the network characteristics which are required by a service instance. A network slice
instance may also be shared across multiple service instances provided by the network operator. The network
slice instance may be composed by none, one or more sub-network instances, which may be shared by
another network slice instance.
3.2.5 PDU session: Association between the UE and a data network through IMT-2020 that provides a
PDU connectivity service. The type of the association includes IP type, Ethernet type and non-IP type.
3.2.6 physical resource: A physical asset for computation, storage or transport including radio access.
Network functions are not regarded as resources.

4 Abbreviations and acronyms
This deliverable defines the following abbreviations:

AN Access Network
CN Core Network

CP Control Plane
CPE Customer Premises Equipment
CritC Critical Communication

eMBB enhanced Mobile BroadBand
IMT-2020 International Mobile Telecommunication 2020

IoT Internet of Things
MMCF Mobility Management Control Function

NAS Non-Access Stratum
NF Network Function

NFI Network Function Instance
NS Network Slice
NSI Network Slice Instance

NSSF Network Slice Selection Function
PCRF Policy and Charging Rule Function

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