3. Pickup and Forwarding (PF):
As outlined in Section 3, tourists might be concerned about their devices’ limited battery and storage.
In PF mode, tourists use the information storage hubs located in tourist spots to store their messages. These stored messages will then depend upon the local users to carry and forward them until the messages reach their intended destinations using the cloud infrastructure. Unlike LF mode, in PF mode tourists nodes do not need to interact with local nodes to transfer messages.
Instead, interaction takes place via the hubs. An appropriate incentive framework [2] can encourage local users to act
accordingly.