Page 117 - ITU-T Focus Group IMT-2020 Deliverables

ITU-T Focus Group IMT-2020 Deliverables 3

6.3.1.2 Overall architecture of generalized Operating Platform

The following figure is showing a representation of the Overall architecture of the generalised Operating
Platform for Network softwarization.
In synthesis, the Operating Platform will exploit a “generalised orchestration space” which performs end-to-
end services orchestration capabilities (e.g., related the logics of higher services) as well as orchestration
capabilities of the ETSI NFVO. The so called infrastructure controller reported in the figure includes the
capabilities of the ETSI VNFM.

Figure 6.3.1-2 – Overall architecture of the generalised Operating
Platform for Network softwarization

Service Orchestrators interact each other via a set of communication/interaction primitives, of which pub-
sub represents just one example.
Legacy/proprietary system could be integrated provided that they are exporting towards the “generalized
orchestration space” the descriptions of their own domain through APIs through their controllers.
Specifically, the domain description can be exported according to YANG data model (both configuration and
capabilities). Domain description includes the computational and storage resources that can be provided by
the system (e.g., available number of CPUs, available RAM), connectivity capabilities, and the descriptions of
other specific services that can be offered.
It should be mentioned that the state of the art of technologies and innovative architectures for orchestration
is registering progresses also in the context of several 5GPPP H2020 projects. Notably two examples are
SONATA [Ref.6.3.1-9] and 5G Exchange (5GEx) [Ref.6.3.1-10]. However the architecture above described
(figure 2) is beyond this state of the art. The concept of "generalized" orchestration space (i.e., highly
distributed orchestrators communicating/interacting with certain set of communication primitives) is
extending the layering approach proposed in [Ref.6.3.1-9]; moreover this "generalized" orchestration space
is expected to be "fully agnostic" with respect to any other available orchestration and control solutions

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