Charles Fico Fahd Ahmad Saeed

1. Group Mobility for Ad Hoc Wireless Networks Charles Fico Fahd Ahmad Saeed

2. Group Mobility for Ad Hoc Wireless Networks • Provides a more realistic group model • Applicable to performance characterization of network protocols

3. Cellular Networks • Individual movement models • Calls originate and terminate in service areas of the base stations • Moving across cellular boundaries, handoff to new areas boundaries

4. Random Models • Random Walk • Markovian Model • Random Gauss-Markov

5. Ad Hoc • Based on Individual motion behavior during epochs • Random Mobility Model • Speed and direction have no relation to past values in previous epoch • Creates unrealistic behavior • Sharp turns, sudden stops

6. Ad Hoc cnt’d • Random Waypoint Mobility model • Extension of Random Walk model • Breakdown movement into repeating pause/motion periods • Chiang’s Markovian Model • States represent motion direction • Probability of motion/direction determined by transition matrix • More realistic

7. Ad Hoc cnt’d • Incremental Model • Speed and direction of current movement diverge incrementally from original path.

8. Group Mobility • Old Random Models don’t provide realistic results • Individual inter-team collaboration • Groups can be partitioned with own mobility behavior

9. Group Mobility - RPGM • Individual • Each have a different rate of change • Motion is referenced relative to group center • Individuals are uniformly distributed between 0 to 360

10. Group Mobility – RPGM cnt’d • Application specifics • Effects specific group mobility • Overlapped Groups • Convention Model • Joint Infantry/Vehicle (complex scenarios & two level mobility)

11. Group Mobility – RPGM AppsBattle Field/Disaster Recovery – Same Op, Different Areas

12. Group Mobility – RPGM AppDiff Ops, Overlapped groups

13. Group Mobility – RPGM AppConvention Model

14. Group Mobility – RPGM Performance • Mobility Increase  Link up/down rate increase

15. Group Mobility – RPGM Performance • Group Mobility models effect change rate differently

16. Group Mobility – RPGM Performance • DSDV degrades faster as mobility increase, independent of mobility model

17. Group Mobility – RPGM cnt’d • No drastic decrease in throughput, but change rate increases as mobility increases.

18. Group Mobility – RPGM Performance

19. Group Mobility – RPGM Performance

20. Group Mobility – RPGM Performance

21. Group Mobility – RPGM Performance