
Effective File Transfer in Mobile Opportunistic Networks ◾ 215
© 2011 by Taylor & Francis Group, LLC
that collaborative forwarding can utilize opportunistic connections and thus bet-
ter exploit the diversity of network mobility. We also observe that the service ratio
improves as the value of γ increases, especially in the iMote scenario. e reason is
that the iMote scenario’s mobility trace was collected by 41 iMote devices, but it did
not record network contacts among the other 233 external devices. Consequently,
iMote devices generally have a much greater number of network contacts than
external devices. Moreover, the Mobile Hotspots scheme ...