Sporadic Cloud-Based Mobile Augmentation on the Top of a Virtualization Layer: A Case Study of Collaborative Downloads in VANETs

Table 1

List of messages used in our S-CMA approach.

Used by	Messages	Description
CN	M_ResourceInfoFromCN	Used to send the resource information from a CN to a VN.
AppN	M_SearchRequest	Allows requesting a CN to perform content search, when an AppN is not connected to the Internet.
AppN	M_ResourceRequest	Used to request augmentation resources (bandwidth in NaaS).
AppN	M_CloudResourceInfo	Contains information about the available bandwidth for the augmentation process.
AppN	M_WithoutCollaborators	Indicates that there are no available augmentation resources.
AppN	M_InsufficientResources	Indicates that there are no enough augmentation resources.
AppN	M_UnavailableAugmentationService	Indicates to the application layer that the augmentation service is not available.
AppN	M_CloudRelease	Indicates the release of a sporadic cloud.
AppN	M_SendTaskToCN	Allows to send download tasks to CNs.
CN	M_AcceptedTaskFromCN	Allows the CNs to confirm that they accept to download contents for the AppN.
CN	M_CompleteTask	Allows the CNs to send chunks of the AppN-requested content.
AppN	M_CompleteTaskACK	Acknowledgement that the chunks have arrived correctly from the CN to the AppN.
CN	M_IncompleteTask	Used to report that a download task cannot continue.
AppN	M_IncompleteTaskACK	Acknowledgement that a download task cannot continue in a CN.
AppN	M_TaskInfo	Allows to send the information of completed/incomplete download tasks to the application layer of the AppN.