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With recent drastic growth in the number of users carrying smart mobile devices, it is not hard to envision opportunistic ad-hoc communications taking place with such devices carried by humans. This leads to, however, a new challenge to the conventional link-level metrics, solely defined based on user mobility, such as inter-contact time, since there are many constraints including limited battery power that prevent the wireless interface of each user from being always 'On' for communication. By taking into account the process of each user's availability jointly with mobility-induced contact/inter-contact process, the authors investigate how each of them affects the link-level connectivity depending on their relative operating time scales.
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