Proximity refers to how “close” things are from cloud/fog nodes, service type, storage and/or computational facilities. Continuous transfer of large volumes of data could be time consuming and require a certain level of bandwidth. Thus, if things are in fixed location, interactions with fog/cloud nodes in terms of duration and bandwidth could be estimated/predicted. However, this does not apply to mobile things since network coverage varies and is dependent on many physical factors. The proximity criterion is appropriate when considering data transmission, such as Thing ^ Cloud and Thing ^ Fog.
Frequency criterion refers to the rate of data transfer from things to fog/cloud nodes. The frequency could be regular with fixed frequency (e.g., every 2 hours) or continuous with different frequency (e.g., every time patient’s blood pressure drops). Frequency may be set according to the proximity criterion.
Sensitivity criterion refers to the nature of data exchanged between things and fog/cloud nodes. Highly-sensitive data should not be exposed longer than is required on the networks and during the data processing among all things, fog and cloud nodes.
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