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How to squeeze more performance out of your wifi

Achim Friedland
Chaos Communication Congress 23th (23C3) 2006
Indexed on
Mar 27, 2013
File name
File size
1.2 MB

Most of today's long-range wireless mesh or point-to-point links suffer from a high overhead during channel access, frequent link failtures and the lack of taking a real advantage of the mesh network structure. This leads to a really bad performance for TCP-like traffic compared to UDP traffic over this links. We want to present your two different ideas for optimizing throughput and delay without breaking any wifi-standard (or at least not too much ;). Most of today's wireless mesh networks can be characterised by the use of cheap half-duplex transmission technologies like IEEE 802.11. It suffers from a high overhead during channel access, frequent link failures and the lack of taking a real advantage of the mesh network structure. All this may result in low throughput and high end-to-end delay. To improve both properties, one may use diversity achieved through multiple channels directional high gain antennas, polarization multiplex and frame aggregation techniques. Additionally -- in order to take an advantage of the mesh network structure -- it is possible to divide the up- and downstream of a wifi point-to-point link into two seperate links. This eliminates the concurrency between both directions. Results of calculations, simulations and measurements show an improved distribution of delay and a significant higher throughput especially for TCP-like applications. Both values can furthermore be improved by an optimization of the IEEE 802.11e quality-of-service parameters.

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