Page 34 - Cloud computing: From paradigm to operation

1 Framework and requirements for cloud computing

– Interoperability: It is recommended that cloud service provided by the CSP complies with
appropriate specifications and/or standards for allowing these systems to work together;
– Portability: It is recommended that cloud service provided by the CSP supports the portability of
software assets and the data of cloud service customers (CSCs) with minimum disruption;
– Service access: The CSP is recommended to provide CSCs with access to cloud services from a variety
of user devices. It is recommended that CSCs be provided with a consistent experience when
accessing cloud services from different devices;

– Service availability, service reliability and quality assurance: It is recommended that the CSP
provides end-to-end quality of service assurance, high levels of reliability and continued availability
of cloud services according to the service level agreement (SLA) with the CSC.

7 General requirements for IaaS
The general requirements for infrastructure as a service (IaaS) derived from the use cases in clause I.2 are as
follows:
– Configuration, deployment and maintenance of resources: The IaaS CSP is recommended to
configure, deploy and maintain processing, storage and/or networking resources with specific SLAs
and charging models to CSCs;
– Use and monitoring of resources: The IaaS CSP is recommended to provide the capability for CSCs
to use and monitor processing, storage and/or networking resources so that they are able to deploy
and run arbitrary software.
NOTE – Functional requirements for IaaS are provided in [ITU-T Y.3513].

8 General requirements for NaaS

The general requirements for network as a service (NaaS) derived from the use cases in clause I.3 are as
follows:
– On-demand network configuration: It is required that the NaaS CSP provides the network
capability, which can be configured on demand by the CSC;
– Secure connectivity: It is required that the NaaS CSP provides secure connectivity;
– QoS-guaranteed connectivity: The NaaS CSP is recommended to provide QoS-guaranteed
connectivity according to the negotiated SLA;
– Heterogeneous networks compatibility: It is recommended that the NaaS CSP supports network
connectivity through heterogeneous networks.
NOTE – Functional requirements for NaaS are provided in [ITU-T Y.3512].

9 General requirements for DaaS
The general requirements for desktop as a service (DaaS) derived from the use cases in clause I.4 are as
follows:
– Configurability of the virtual environment: It is recommended that a user is capable of configuring
the virtual desktops' virtual environment, such as the central processing unit (CPU), memory,
storage, network, etc.;

– Fast boot-up time: DaaS CSP is recommended to provide CSCs with appropriate boot-up time of
their virtual desktops;
– QoE: DaaS CSP is recommended to provide an acceptable user experience, including the running
speed of application programs and the capability to select and run various applications, when
application programs run in their CSC devices;
– Single sign-on access control: It is recommended that a CSC is capable to get all DaaS functionality
with appropriate security requirements through a single sign-on mechanism.

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