Page 57 - ITU-T Focus Group IMT-2020 Deliverables
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ITU-T Focus Group IMT-2020 Deliverables                                 2


            •       5G Control Plane

            The 5G Control Plane (5G-CP) provides programmable means to control the behaviour of 5G resources (such
            as data transport and processing), following requests received from the 5G-ASP and according to 5G-MP
            policies. 5G-CP is operating on resources provided by the 5G Resource Layer and exposes an abstracted view
            of the 5G access and core network to the 5G Application and Service Plane. The 5G-CP interacts with the 5G
            Resource Plane (5G-RP), 5G-ASP, and 5G-MP via standard interfaces.

            –       Applications and Services Support
            The Control Plane Applications and Services Support (CP-AAS) provides a standard interface to the 5G-ASP
            for  accessing  5G  network  information  and  requesting  application-specific  5G  network  behaviours.  The
            information exposed to 5G-ASP is abstracted by means of information and data models. In case of network
            virtualization by softwarization capability, the CP-AAS may expose a subset of network resources which can
            be used for exclusive for the virtual network.
            –       Management Support, Softwarization, and Orchestration
            The  Control  Plane  Management  Support,  Softwarization,  and  Orchestration  (CP-MSSO)  provides
            management  support,  softwarization,  and  orchestration  capabilities  of  5G-CP  and  the  management,  if
            delegated by 5G-MP, of network resources based on the policies provided by 5G-MP in multi-domain and/or
            heterogeneous 5G access and core network environment. It also provides the capabilities for provisioning CP
            functions and managing a particular CP function and its scalability and performance based on the KPIs. It
            keeps track of the overall state of allocated and available resources in the 5G-CP.
            It orchestrates CP functions based on service policies (e.g., a placement rule which aims to avoid single points
            of failure) and softwarizes some CP functions as virtual functions if required.
            The CP-MSSO also provides capabilities for connecting multiple 5G access and core network domains in order
            to make inter-domain operations. In such case it is responsible for establishing the communication path(s)
            required, and for passing appropriate identity and credentials with requests made among these domains.
            –       Control Plane Functions
            The Control Plane Functions (CP-F) provides a set of programmable control and optionally management
            functions (if delegated by 5G-MP) covering e.g., discovery of physical and virtual network topologies, network
            element configuration, and traffic flows forwarding management, on-demand path computation, monitoring
            of responsible resources, mobility management, mobile edge including distributed EPC control, cloud control,
            etc.
            –       Resource Abstraction

            The Control Plane Resource Abstraction (CP-RA) provides capabilities to support unified programmability of
            resources.  Common  information  and  data  models  of  underlying  resources  are  provided  so  that  the
            developers of CP functions can simplify their program logics without the need for a detailed knowledge of
            the underlying network resource technologies. These models provide a detailed, abstracted view of both,
            physical or virtualized network resources. The Resource Abstraction can create multiple virtual resources by
            using a single physical resource or can create a composite virtual resource as an aggregation of several virtual
            or physical resources. In cases when the Resource Plane provides itself the abstracted view of its resources
            to the 5G-CP, the CP-RA can be ignored.

            •       5G Resource Plane
            The 5G Resource Plane (5G-RP) is where the physical or virtual network elements perform transport and/or
            processing of data packets according to 5G-CP decisions. Such data processing can be hardwired as it is the
            case at the present or programmable which is supported by user plane deep programmability capabilities.
            These decisions, the information about network resources, and resource management policies/requests are
            exchanged via standard interfaces.








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