Page 10 - ITU-T Focus Group IMT-2020 Deliverables
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1                                        ITU-T Focus Group IMT-2020 Deliverables


            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.
            Service Instance: An instance of an end-user service or a business service that is realized within or by a
            network slice. Each service is represented by a service instance. Services and service instances would be
            provided by the network operator or by third parties.

            2.2     Terms and definitions need further harmonization
            The following terms need more work to reach consensus in the future ITU-T SG13 meeting.

            Network  slice:  A  Network  slice  is  a  managed  group  of  infrastructure  resources,  network  functions  and
            services. Network slice is programmable and has the ability to expose its capabilities. The behaviour of the
            network slice realized via network slice instance(s).
            NOTE 1 – Network slice enables the operator to create networks customized to provide flexible solutions for
            different market scenarios, which have diverse requirements, with respect to the functionality, performance
            and resource separation.

            NOTE 2 – Infrastructure resources include any kind of resources (e.g., physical, logical, virtual resource).
            Orchestration:  An  automated  arrangement,  coordination  of  complex  network  systems  and  functions
            including middleware for both physical and virtual infrastructures. It is often discussed as having an inherent
            intelligence or even implicitly autonomic control. Orchestration results in automation with control network
            systems.
            Physical resource: A physical asset for computation, storage and transport (e.g. switch, router, antenna, etc.).

            NOTE – Network functions are not regarded as resources.
            Slice:  As  a  concept  describing  system  behaviour,  slice  is  a  logically  isolated  set  of  programmable
            infrastructure resources (i.e., physical and/or logical resources) to enable functions and services of IMT-2020
            network. Slice is created and deleted by order from the orchestrator.







































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