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XaaS 3

– Billing functional component. The billing functional component has capabilities for the metering and
rating of the use of NaaS services by NaaS CSCs and the generation of invoices based on the charges
for the use of NaaS services created by the metering and rating function, and the transmission of
the invoices to the NaaS CSCs.

In addition to BSS components defined in [ITU-T Y.3502], the following functional components are added (see
Figure 8-1):

– The customer order management functional component is responsible of the lifecycle management
of a NaaS CSCs' requests for NaaS products (and NaaS services offered by these NaaS products). This
includes customer order establishment (step guiding, data collection and validation), customer
order orchestration and overall customer order lifecycle management (see [ITU-T Y.3521] and
[ITU-T Y.3522]). Orders from NaaS CSCs may be for new NaaS products and NaaS services, or may
be for updating or terminating of an existing NaaS service;
– The product inventory functional component holds information of NaaS products' instances ordered
by NaaS CSCs. This information is updated during the lifecycle of the NaaS products instances,
reflecting changes resulting from execution of management operations on these NaaS product
instances.

8.2 Service layer functional components for NaaS
Figure 8-2 shows the service layer functional components used for NaaS services instantiation and also when
a NaaS service is instantiated by the NaaS CSP.

Figure 8-2 – Service layer functional components for NaaS

8.2.1 Business capabilities (NaaS)
The business capabilities (NaaS) functional component provides a set of capabilities for accessing the NaaS
business related functionalities (see clause 7.1) related to the provision of NaaS services. The business
functionalities are contained within the business support systems (BSS) functional components (see
clause 8.1).

In particular, the business capabilities (NaaS) functional component provide access means for the NaaS CSC
to select and purchase a NaaS product (and associated NaaS services with associated NaaS service models
and NaaS service operational policy models) available in the product catalogue functional component (see
clause 8.1). Once validated by the NaaS CSP, the requested NaaS service is instantiated by the NaaS CSP, i.e.,
a corresponding service capabilities (NaaS) functional component is made available in the service layer
allowing for further NaaS service interactions between the NaaS CSC and the NaaS CSP. If not already
instantiated an administration capabilities (NaaS) functional component is also made available in the service
layer allowing for NaaS service-related management interactions between the NaaS CSC and the NaaS CSP.

Interactions through the business capabilities (NaaS) functional component also allow for the NaaS CSC to
access the billing information related to the usage of instantiated NaaS services. Using BSS and OSS functional
components, the NaaS CSP collects relevant usage measurements and usage events in order to generate and
provide a bill to the NaaS CSC.

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