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How small labels create big improvements

How small labels create big improvements. Pan Hui Jon Crowcroft Computer Laboratory University of Cambridge. US-based Conferences. In Memory of 9/11/01 We will never FORGET It IS Terrorists make USA government delaying visas for Asian people. Outlines.

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How small labels create big improvements

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  1. How small labels create big improvements Pan Hui Jon Crowcroft Computer Laboratory University of Cambridge

  2. US-based Conferences In Memory of 9/11/01 We will never FORGET It IS Terrorists make USA government delaying visas for Asian people.

  3. Outlines • Community and forwarding in PSN • Affiliations-based iMote Experiment • LABEL : a community based forwarding • Empirical results of community improves forwarding • Conclusion

  4. Community and Forwarding • PSN: human mobile networks under DTN and MANET • Naive forwarding schemes created unwanted traffics • Identifying community information improve forwarding efficiency • No empirical evaluation of this belief

  5. Affiliations based iMotes Experiment • Infocom 2006 Barcelona, Spain (not USA) • 4 affiliation groups of 34 people • 2 Paris groups, 1 Switzerland group, 1 Barcelona group • Largest group of 15 people • Carry the iMotes during the conference period • iMotes log the contact with each other+other Bluetooth devices

  6. Label Strategy (LABEL) • Priori label, e.g. affiliation • Correlated interaction • Forward to nodes have same label as the destination • Good performance in conference mixing environment Destination : GOOD PEOPLE USA soldiers Asian people LABEL: GOOD PEOPLE LABEL: BAD PEOPLE Pretty Ladies

  7. Empirical Results

  8. Problem with LABEL • In a less mixing environment • A person in one group may not meet members in another group so often • Wait for destination group not efficient • So smarter strategies make use of community information should be investigated

  9. Conclusions ICMAN2007, New York, China • Even very small amount of state information bring significant improvement in forwarding efficiency • Need to embed state information in future design

  10. ICMAN2007, New York, China Thank you ! http://www.cl.cam.ac.uk/~ph315/ Pan.Hui@cl.cam.ac.uk Jon.Crowcroft@cl.cam.ac.uk

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