Page 255 - ITU-T Focus Group IMT-2020 Deliverables

ITU-T Focus Group IMT-2020 Deliverables 3

In conclusion, one of the main design objectives in IMT-2020 Networking and IMT-2020 Multi-Service Control
& Management is efficient integration of service programmability, domain orchestration functionality and
DevOp functionality. This will maximize the predictability, efficiency, security, and maintainability of
operational processes.

Figure 17 – IMT-2020 Service & Network Management and Orchestration Architecture

9.3.1.2 Multi-Domain Management and Orchestration Architecture
Multi-domain orchestration refers to the automated management of services and resources in multi-
technology (multiple domains involving different cloud and networking technology) and multi-operator
(multiple administrative domains) environments. The scope of the end-to-end multi-domain management
and orchestration plane involves diverse concepts summarized in Figure 18. Figure 18 represents the
reference architectural framework for organizing the components and interworking interfaces involved in
end-to-end management and orchestration in multi-domain environments. At the lower layer there are
resource domains, exposing resource abstraction on interface I5. Domain orchestrators perform resource
orchestration and/or service orchestration exploiting the abstractions exposed on I5 by resource domains.
A Multi-domain Orchestrator (MdO) coordinates resource and/or service orchestration at multi-domain
level, where multi-domain may refer to multi-technology (orchestrating resources and/or services using
multiple domain orchestrators) or multi-operator (orchestrating resources and/or services using domain
orchestrators belonging to multiple administrative domains). The Resource MdO belonging to an
infrastructure operator, for instance operator A, interacts with domain orchestrators via interface I3 APIs to
orchestrate resources within the same administrative domains. The MdO interacts with other MdOs via
interface I2-R APIs (business-to-business, B2B) to request and orchestrate resources across administrative
domains. Resources are exposed at service orchestration level on interface Sl-Or to Service MdOs. Interface
I2-S (B2B) is used by Service MdOs to orchestrate services across administrative domains. Finally the Service

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