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Framework and requirements for cloud computing 1

Use case

Requirements – On-demand network configuration
– Heterogeneous networks compatibility
– QoS-guaranteed connectivity
– Secured connectivity

I.4 DaaS general use case

Use case

Name DaaS general use case
Abstract – Between a consumer and a CSP: In this scenario, a consumer accesses and uses data or
applications in a CSP which offers a virtual desktop service. A consumer can enjoy the
environment with all programs and applications which are identical with those of
traditional PCs. The consumer can choose the virtual hardware specification of its virtual
desktops. If necessary, the environment (i.e., operating system) can be changed to
another one immediately. Since all data is totally stored with password protection and
managed in the CSP, all the consumer has to do is keep up with a password.
– Between an enterprise and a CSP: An enterprise using a virtual desktop service from a
CSP for its internal processes is included in this use case. In this scenario, the enterprise
can select applications or OS in the DaaS service for certain enterprise functions. Unlike
the use case between a consumer and a CSP, the enterprise normally uses storage for
backups. Also, the enterprise can overcome peak loads and save energy by requesting
the CSP online to increase or decrease the number of virtual desktops, respectively.
– Between an enterprise, a consumer and a CSP: In this scenario, the enterprise makes
the consumer work with its internal processes outside of the enterprise by transferring
virtual desktops and related data through the CSP. Contrary to the above two scenarios,
the consumer cannot select applications freely and more limitations to access data in
the enterprise may exist than within the enterprise. Whenever the consumer connects
with the CSP, the CSP sends data to the consumer by accessing the enterprise to handle
or bypass corresponding data.
Roles CSP, CSC
Figure

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