Page 677 - Cloud computing: From paradigm to operation

XaaS 3

6.2 NaaS CSC activities

Activities of the NaaS CSC role are described in clause 8.2 of [ITU-T Y.3502]. These activities are applicable to
the case of a NaaS CSC involved in a relationship with a NaaS CSP. Taking the use cloud service activity in
CSC-CSP relationship (see Annex A of [ITU-T Y.3502]), Figure 6-1 illustrates the relationships between
functional components involved in the use cloud service activity of the CSC:cloud service user sub-role.

Figure 6-1 – Use of a NaaS service

As for any cloud service, NaaS service capabilities (together with NaaS administration and business
capabilities) are positioned in the service layer of the cloud computing layering framework (see clause 9.2 in
[ITU-T Y.3502]).

NaaS services are made available to the CSC:cloud service users via an endpoint and interface enabled by the
service access functional component. The CSC:cloud service user performs the use cloud service activity
through the user function functional component, which then invokes NaaS through the service access
functional component. The service access functional component performs any authentication of the
CSC:cloud service user and establishes authorization to use particular NaaS service capabilities of NaaS.
If authorized, the service access functional component invokes the NaaS service's software implementation
which then handles the request.
NaaS services provide self-service capabilities allowing the NaaS CSC to control, manage, monitor and
optimize the resources offered as a service by the NaaS CSP in a programmable manner.

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