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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
OBSS Simulations

Authors:

Date: 2009-04-16

Alex Ashley, NDS Ltd


Abstract
Abstract

We have performed some OBSS experiments using our 802.11 simulator. This presentation shows some of our results.

Alex Ashley, NDS Ltd


Simulation parameters
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


Overlapping networks
Overlapping Networks

100m

100 m

Alex Ashley, NDS Ltd


100 m

Alex Ashley, NDS Ltd


100 m

Alex Ashley, NDS Ltd


80 m

Alex Ashley, NDS Ltd


60 m

Alex Ashley, NDS Ltd


40 m

Alex Ashley, NDS Ltd


20 m

Alex Ashley, NDS Ltd


1 m

Alex Ashley, NDS Ltd


Adding more homes channels
Adding More Homes & Channels

Alex Ashley, NDS Ltd


100 m

Alex Ashley, NDS Ltd


100 m

Alex Ashley, NDS Ltd


80 m

Alex Ashley, NDS Ltd


60 m

Alex Ashley, NDS Ltd


40 m

Alex Ashley, NDS Ltd


20 m

Alex Ashley, NDS Ltd


1 m

Alex Ashley, NDS Ltd


Video results
Video Results

300m

No dropped packets

1m

Frequent dropped packets

Alex Ashley, NDS Ltd


Conclusions
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


References
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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