Page 601 - Cloud computing: From paradigm to operation

XaaS 3

• operational support systems functional component-monitoring and reporting: monitoring and
controlling virtual desktop resource function (see clause 7.3.1)
• operational support systems functional component-service policy management: operational
policy management for DaaS function (see clause 7.3.4)
• operational support systems functional component-platform and virtualisation management:
virtual desktop resource allocation and distribution function (see clause 7.3.3)
• operational support systems functional component-incident and problem management: high
availability for DaaS function (see clause 7.3.5), power management of virtual desktop resource
function (see clause 7.3.6)
• business support systems functional component-account management: user account and
profile management function (see clause 7.3.2)

There are four DaaS functions that are not mapped to any functional components in [ITU-T Y.3502]; they can
be located in the layering framework as follows:
– User layer:

• connection negotiation function (see clause 7.4.2), client peripheral connection function (see
clause 7.4.3), service continuity for user environment function (see clause 7.4.4)
– Multi-layer functions:

• operational support systems functional component: provisioning and allocation of virtual
desktop function (see clause 7.2.4)

The detailed mapping is in Appendix II.
Since there are no reference points among functional components in [ITU-T Y.3502], it is necessary to adopt
the grouping of DaaS functions in order to specify their reference points for convenience. Clause 9 explains
the reference points based on four groups of DaaS functions as in Figure 7-1, i.e., client support functions,
virtual desktop connection and delivery functions, virtual desktop resource management functions, and
virtualization infrastructure functions.

9 DaaS functional architecture

9.1 Client support functions
The client support functions (CS-FS) have four functions including: connection negotiation function (CN-F),
client peripheral connection function (CPC-F), service connection function (SC-F), and service continuity for
user environment function (SCUE-F) as shown in Figure 9-1. The CS-FS interfaces with only the virtual desktop
connection and delivery functions (VDCD-FS).

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