Link-level Measurements from an 802.11b Mesh Network - Revision history

Dzikowsk: /* Effects of node proximity on loss rates */ Corrected a typo.

2007-07-18T14:24:19Z

Effects of node proximity on loss rates: Corrected a typo.

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	For inter node distance to be the explaination for the distribution of the loss rates, there should be a correlation between the distance and the resulting delivery probability. One could expect the recieved signal to be consistently weaker, the bigger the distance to the source node is.		For inter node distance to be the explaination for the distribution of the loss rates, there should be a correlation between the distance and the resulting delivery probability. One could expect the recieved signal to be consistently weaker, the bigger the distance to the source node is.

	The surprising fact is, that this is not the case. Inter node distance certainly determines the delivery probability to some extent, but the correlation is not consistent. As the graphics show, even very small variations of the sender position have tremendous effects on the resulting pattern of delivery probabilities. If node proximity ~~was~~ the decisive factor, we would certainly see a stronger correlation.		The surprising fact is, that this is not the case. Inter node distance certainly determines the delivery probability to some extent, but the correlation is not consistent. As the graphics show, even very small variations of the sender position have tremendous effects on the resulting pattern of delivery probabilities. If node proximity were the decisive factor, we would certainly see a stronger correlation.

	==The effect of signal-to-noise ratio==		==The effect of signal-to-noise ratio==

Dzikowsk: /* The effect of transmit bitrate */ Corrected a typo.

2007-07-17T16:09:19Z

The effect of transmit bitrate: Corrected a typo.

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	==The effect of transmit bitrate==		==The effect of transmit bitrate==

	As far as transmit bitrate is concerned, there are a couple of interesting implications, that can be drawn from the experiments. These experiments show, that the transmit bitrate that provides optimum performance in terms of throughput, is not characterized by the minimum loss rate. On the contrary, the optimum bitrate of 12 Mbps exhibits a significant loss rate. The results of a corresponding experiment are visualised in the following figures.		As far as transmit bitrate is concerned, there are a couple of interesting implications, that can be drawn from the experiments. These experiments show, that the transmit bitrate that provides optimum performance in terms of throughput, is not characterized by the minimum loss rate. On the contrary, the optimum bitrate of 11 Mbps exhibits a significant loss rate. The results of a corresponding experiment are visualised in the following figures.

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Dzikowsk: /* Potential sources for packet loss in RoofNet */

2007-07-13T17:42:30Z

Potential sources for packet loss in RoofNet

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	Because RoofNet is above all a research project, the users agree that experiments will be carried out from time to time. The conclusions presented here are implications drawn from such experiments.		Because RoofNet is above all a research project, the users agree that experiments will be carried out from time to time. The conclusions presented here are implications drawn from such experiments.

	=Potential ~~sources~~ for packet loss in RoofNet=		=Potential causes for packet loss in RoofNet=

	Many of the existing routing algorithms rely on the assumption, that the neighbor abstraction holds. This is certainly true as far as wired networks are concerned. In the research community there is no consensus on whether or not it is also true for wireless networks.		Many of the existing routing algorithms rely on the assumption, that the neighbor abstraction holds. This is certainly true as far as wired networks are concerned. In the research community there is no consensus on whether or not it is also true for wireless networks.

Dzikowsk at 17:35, 13 July 2007

2007-07-13T17:35:05Z

Show changes

Dzikowsk: /* References */

2007-07-13T16:00:52Z

References

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	* [http://pdos.csail.mit.edu/~rtm/papers/p442-aguayo.pdf D. Aguayo, J. Bicket, S. Biswas, G. Judd, R. Morris: Link-level Measurements from an 802.11b Mesh Network]		* [http://pdos.csail.mit.edu/~rtm/papers/p442-aguayo.pdf D. Aguayo, J. Bicket, S. Biswas, G. Judd, R. Morris: Link-level Measurements from an 802.11b Mesh Network]
			* Rech, Jörg: ''Wireless LANs. 802.11-WLAN-Technologie und praktische Umsetzung im Detail''. Heise; 2. aktualisierte und erweiterte Auflage (Juni 2006). ISBN 3936931291

	===External links===		===External links===

Dzikowsk at 17:46, 12 July 2007

2007-07-12T17:46:15Z

← Older revision		Revision as of 17:46, 12 July 2007
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	* [http://pdos.csail.mit.edu/~rtm/papers/p442-aguayo.pdf D. Aguayo, J. Bicket, S. Biswas, G. Judd, R. Morris: Link-level Measurements from an 802.11b Mesh Network]		* [http://pdos.csail.mit.edu/~rtm/papers/p442-aguayo.pdf D. Aguayo, J. Bicket, S. Biswas, G. Judd, R. Morris: Link-level Measurements from an 802.11b Mesh Network]

			===External links===

			* [http://pdos.csail.mit.edu/roofnet/doku.php MIT RoofNet]

Dzikowsk at 17:55, 9 July 2007

2007-07-09T17:55:17Z

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	(This article is a stub. Details will be added soon)		(This article is a stub. Details will be added soon.)

	== References ==		== References ==

Dzikowsk at 17:54, 9 July 2007

2007-07-09T17:54:59Z

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			(This article is a stub. Details will be added soon)

	== References ==		== References ==

Dzikowsk at 17:22, 9 July 2007

2007-07-09T17:22:25Z

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	== References ==		== References ==

	[http://pdos.csail.mit.edu/~rtm/papers/p442-aguayo.pdf D. Aguayo, J. Bicket, S. Biswas, G. Judd, R. Morris: Link-level Measurements from an 802.11b Mesh Network]		* [http://pdos.csail.mit.edu/~rtm/papers/p442-aguayo.pdf D. Aguayo, J. Bicket, S. Biswas, G. Judd, R. Morris: Link-level Measurements from an 802.11b Mesh Network]

Dzikowsk at 17:13, 9 July 2007

2007-07-09T17:13:20Z

New page

== References ==

[http://pdos.csail.mit.edu/~rtm/papers/p442-aguayo.pdf D. Aguayo, J. Bicket, S. Biswas, G. Judd, R. Morris: Link-level Measurements from an 802.11b Mesh Network]