1. The Role of Information in
Opportunistic Networks
Waldir Moreira
waldir.junior@ulusofona.pt
March 6th, 2013
SITILabs Brainstorming Meeting

2. Agenda
• Introduction
• Routing
• The proposal
• Experiments
• Conclusions

3. Introduction
• Opportunistic Networking
– Contact opportunity

4. Introduction
• Suitable for today's scenario
– Users consume/produce
– Need to be connected

5. Routing
• Different proposals
– Mostly host-based

6. Routing
• Travelling content
– May be of interest
– Users are prosumers

7. Routing
• Content/interest-based delivery
– Improvements in routing

8. The proposal
• Social-aware dLife
– Focus on the content
– Users' interests in it
• Goal
– Improve routing performance

9. The proposal
• dLife
– Social weight towards dest.
– User importance
• dLifeIC
– Social weight towards interest
shared by different destinations

10. Experiments
• Scenarios
– Human traces
• Content-based routing
– Synthetic mobility
• Different mobility levels

11. Experiments

12. Experiments
• Performance metrics
– Average delivery probability (i.e., ratio
between the # of delivered messages
and the total number of messages that
should have been delivered)
– Average cost (i.e., number of replicas
per delivered message)
– Average latency (i.e., time elapsed
between message creation and delivery)

13. Experiments
• Communities help Bubble Rap • Bubble Rap relies on global centrality (bottlenecks)
• Contact sporadicity affects dLife/dLifeIC • dLife is affected by buffer limitation
• Focusing on content helps dLifeIC
• Buffer constraint
• Little interaction affects social-aware solutions
• Node delivery ability increases with # of
interests

14. Experiments
• Average cost
– Bubble Rap/dLife: increase
with load
– dLifeIC: decreases
• Average latency
– dLifeIC: less time to deliver

15. Conclusions
• Focusing on content
– Reach full delivery
– Very low associated cost
– Suitable delay
• Further investigation under very low
mobility scenarios
Content has a important role in
improving information delivery ☺

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