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OBSS Simulations

OBSS Simulations. Authors:. Date: 2009-04-16. Abstract. We have performed some OBSS experiments using our 802.11 simulator. This presentation shows some of our results. Simulation Parameters. Home Detached house 8m x 5.5m x 4.8m, 2 floors, 4 rooms per floor

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OBSS Simulations

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  1. OBSS Simulations Authors: Date: 2009-04-16 Alex Ashley, NDS Ltd

  2. Abstract We have performed some OBSS experiments using our 802.11 simulator. This presentation shows some of our results. Alex Ashley, NDS Ltd

  3. Simulation Parameters • Home • Detached house 8m x 5.5m x 4.8m, 2 floors, 4 rooms per floor • Outer walls: 2 layers of Brick, Plaster • Inner Walls: 2 sheets drywall* • Floors: Wood, Plaster • Distance between homes varied from 300m to 1m • 802.11 parameters • 1 AP and 5 stations per home, randomly placed • 11bg mode, European regulatory channel & power rules, no TPC • EDCA, no block ACK, no DLS • 11n Channel model B + DARPA building material losses • Video • 2 x 3Mbps video, streamed using unicast UDP *AKA: gypsum board, wallboard, plasterboard, gib, rock lath, Sheetrock, gyproc Alex Ashley, NDS Ltd

  4. Overlapping Networks 100m 100 m Alex Ashley, NDS Ltd

  5. 100 m Alex Ashley, NDS Ltd

  6. 100 m Alex Ashley, NDS Ltd

  7. 80 m Alex Ashley, NDS Ltd

  8. 60 m Alex Ashley, NDS Ltd

  9. 40 m Alex Ashley, NDS Ltd

  10. 20 m Alex Ashley, NDS Ltd

  11. 1 m Alex Ashley, NDS Ltd

  12. Adding More Homes & Channels Alex Ashley, NDS Ltd

  13. 100 m Alex Ashley, NDS Ltd

  14. 100 m Alex Ashley, NDS Ltd

  15. 80 m Alex Ashley, NDS Ltd

  16. 60 m Alex Ashley, NDS Ltd

  17. 40 m Alex Ashley, NDS Ltd

  18. 20 m Alex Ashley, NDS Ltd

  19. 1 m Alex Ashley, NDS Ltd

  20. Video Results 300m No dropped packets 1m Frequent dropped packets Alex Ashley, NDS Ltd

  21. Conclusions • If max transmit power is used, signals are above CCA threshold for a long range • However, BSS need to be reasonably close before reliable information exchange possible • Implies OBSS chains are more complex than “nodes with which communication is possible” • Video streams take up a lot of air time • However good our OBSS solution is, there is still a finite amount of capacity! • Solving the ‘n’ overlap problem is probably only useful in theory, because we run out of capacity after 2 or 3 overlaps! Alex Ashley, NDS Ltd

  22. References • Safaai-Jazi A, et al, Ultra-wideband Propagation Measurements and Channel Modelling, DARPA NETEX Program, Report on “Through-the Wall Propagation and Material Characterization”, Virginia Polytechnique Institute and State University, Blacksburg, Virginia, USA, November 18 2002. • 11n channel models - 11-03-0940r4 Alex Ashley, NDS Ltd

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