Page 673 - Cloud computing: From paradigm to operation

XaaS 3

1 Scope
This Recommendation provides the Network as a Service (NaaS) functional architecture by specifying
functionalities and functional components as well as reference points for the operation support system (OSS).
The scope of this Recommendation consists of:
– Overview of the NaaS functional architecture;
– NaaS functionalities;

– NaaS functional components;
– OSS reference points in the NaaS functional architecture.
This Recommendation also provides appendixes describing:

– The mapping between NaaS functionalities described in this Recommendation and NaaS functional
requirements specified in [ITU-T Y.3512];
– The relationship between the NaaS functional architecture and software-defined networking (SDN);

– An illustrated usage of SDN and network functions virtualization (NFV) in support of the NaaS
functional architecture.

2 References

The following ITU-T Recommendations and other references contain provisions which, through reference in
this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated
were valid. All Recommendations and other references are subject to revision; users of this Recommendation
are therefore encouraged to investigate the possibility of applying the most recent edition of the
Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is
regularly published. The reference to a document within this Recommendation does not give it, as a stand-
alone document, the status of a Recommendation.
[ITU-T X.1601] Recommendation ITU-T X.1601 (2015), Security framework for cloud computing.
[ITU-T Y.2320] Recommendation ITU-T Y.2320 (2015), Requirements for virtualization of control
network entities in next generation network evolution.

[ITU-T Y.3300] Recommendation ITU-T Y.3300 (2014), Framework of software-defined networking.
[ITU-T Y.3302] Recommendation ITU-T Y.3302 (2017), Functional architecture of software-defined
networking (SDN).
[ITU-T Y.3500] Recommendation ITU-T Y.3500 (2014) | ISO/IEC 17788:2014, Information
technology – Cloud computing – Overview and vocabulary.
[ITU-T Y.3501] Recommendation ITU-T Y.3501 (2016) | ISO/IEC 17789:2014, Cloud computing –
Framework and high-level requirements.
[ITU-T Y.3502] Recommendation ITU-T Y.3502 (2014), Information technology – Cloud computing –
Reference architecture.
[ITU-T Y.3512] Recommendation ITU-T Y.3512 (2014), Cloud computing – Functional requirements of
Network as a Service.

[ITU-T Y.3521] Recommendation ITU-T Y.3521/M.3070 (2016), Overview of end-to-end cloud
computing management.

[ITU-T Y.3522] Recommendation ITU-T Y.3522 (2016), End-to-end cloud service lifecycle
management requirements.

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