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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

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OBSS Simulations

Authors:

Date: 2009-04-16

Alex Ashley, NDS Ltd


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

  • 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

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

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

300m

No dropped packets

1m

Frequent dropped packets

Alex Ashley, NDS Ltd


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

  • 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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