Page 602 - Cloud computing: From paradigm to operation

3 XaaS

Figure 9-1 – Functions and reference points in CS-FS

9.1.1 Service connection function
The SC-F connects a virtual desktop in the CS-FS while the user access management function (UAM-F) and
client connection management function (CCM-F) are the counterparts to the same operations in the VDCD-
FS. The SC-F sends CSU's access information to the UAM-F through I_SC_UAM to perform user
authentication. The SC-F exchanges the virtual desktop access information with the CCM-F through
I_SC_CCM to connect a virtual desktop. In addition, the SC-F delivers the DaaS client’s connection state and
additional resource request/cancellation to the delivery protocol processing function (DPP-F) though
I_SC_DPP. Detailed functional description for the SC-F is specified in clause 7.4.1.

9.1.2 Connection negotiation function
The CN-F provides the CS-FS with the user interaction by using negotiation results. The CN-F gathers network
performance information and the DaaS client state, and delivers them to the VDCD-FS through I_CN_DPP.
Consequently, the CN-F also receives the negotiation result from the DPP-F in the VDCD-FS thorough
I_CN_DPP. Detailed functional description for the CN-F is specified in clause 7.4.2.
9.1.3 Client peripheral connection function

The CPC-F handles DaaS client's peripherals on a DaaS client. When the CPC-F recognizes the peripherals, all
sorts of peripheral events (e.g., a connection and control events) are sent to the VDCD-FS though I_CPC_DPP.
A detailed functional description for the CPC-F is specified in clause 7.4.3.

9.1.4 Service continuity for user environment function
The SCUE-F maintains the same user environment even on abnormal network state. When the network is
disconnected, the SCUE-F requests the reconnection to the CCM-F through I_SCUE_CCM. And, the SCUE-F
synchronizes the DaaS user's states between the CS-FS and the provisioning and allocation of virtual desktop
function (PA-F) through I_SCUE_PA. A detailed functional description for the SCUE-F is specified in
clause 7.4.4.

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