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XaaS 3

Appendix I

Development methodology of NaaS functional requirements and architecture
(This appendix does not form an integral part of this Recommendation.)

Considering the standardization methodology and conventional study sequence, the abstractions of
functional entities and their mutual interactions are based on the functional requirements and the
corresponding use cases analysis, which form a standardization body together. Therefore, it is required to
progress NaaS functional requirements and architecture according to the following steps and priorities.
Step 1: Use cases and functional requirements of NaaS which are included in Appendix II and clauses 7-9,
respectively, of this Recommendation. Note that all the functional requirements are derived from the
corresponding use cases.

Step 2: Functional architecture of NaaS should be based on this Recommendation.
Additionally, the general requirements of NaaS are described in [ITU-T Y.3501].

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