In a floating content system, nodes collectively store
and disseminate information content relevant to a certain geographical region.
This requires that enough nodes visit the region, referred to as
the anchor zone, or the content will be permanently lost (say it "sinks").
The animation on the right illustrates the floating content system in action:
- Area corresponds to a 4500m × 3500m region in downtown Helsinki, which constraints
the movement patterns.
- Moving dots correspond to mobile users (or their devices)
- Circles corresponds to anchor zones of a dynamically created information content.
- The nodes collaborately replicate the content within the zone so that
it "floats".
- Color of the circles and nodes indicates the information content.
- Generally, we are interested in determining the conditions under which
the floating content scheme is feasible, which depends on
- Mobility pattern and node density in particular
- Size and shape of the anchor zone
- Replication parameters (cf. cache replacement when limited storage and multiple messages)
- etc...
This simulation has been done with the
ONE simulator.
There is also a java applet
that demonstrates the floating content in a fixed anchor zone.
|
|
