It has been observed that different IEEE 802.11 commercial cards produced by different vendors experience different performance, either when accessing alone the channel, as well as when competing against each other. These differences persist also when thorough measurement methodologies (such as RF shielding, laptop rotation, etc) are applied, and alignment of the environmental factors (same laptop models, traffic generators, etc) is carried out. This paper provides an extensive experimental characterization of the backoff operation of six commercial NIC cards. It suggests a relevant methodological approach, namely a repeatable, well defined, set of experiments, for such a characterization. Low level backoff distribution measurements are taken through a custom equipment developed in our laboratory. Our work allows to detect both a non-standard backoff behavior of some commercial cards (in terms of minimum contention window size and neglection of EIFS times), as well as potential implementation limits (in either the card hardware/firmware and/or the software driver) which appear to severely alter the card performance in challenging conditions.

Bianchi, G., Di Stefano, A., Giaconia, C., Scalia, L., Terrazzino, G., & Tinnirello, I. (2007). Experimental assessment of the backoff behavior of commercial IEEE 802.11b network cards. In INFOCOM 2007. 26th IEEE International Conference on Computer Communications. IEEE (pp.1181-1189). NEW YORK : IEEE [10.1109/INFCOM.2007.141].

Experimental assessment of the backoff behavior of commercial IEEE 802.11b network cards

BIANCHI, GIUSEPPE;
2007

Abstract

It has been observed that different IEEE 802.11 commercial cards produced by different vendors experience different performance, either when accessing alone the channel, as well as when competing against each other. These differences persist also when thorough measurement methodologies (such as RF shielding, laptop rotation, etc) are applied, and alignment of the environmental factors (same laptop models, traffic generators, etc) is carried out. This paper provides an extensive experimental characterization of the backoff operation of six commercial NIC cards. It suggests a relevant methodological approach, namely a repeatable, well defined, set of experiments, for such a characterization. Low level backoff distribution measurements are taken through a custom equipment developed in our laboratory. Our work allows to detect both a non-standard backoff behavior of some commercial cards (in terms of minimum contention window size and neglection of EIFS times), as well as potential implementation limits (in either the card hardware/firmware and/or the software driver) which appear to severely alter the card performance in challenging conditions.
26th IEEE Conference on Computer Communications (INFOCOM 2007)
Anchorage, AK
MAY 06-12, 2007
26
IEEE Communication
Rilevanza internazionale
contributo
Settore ING-INF/03 - Telecomunicazioni
English
Computer software; Laptop computers; Telecommunication traffic; Low level backoff distribution measurements; Network cards; Traffic generators; Window size; Network architecture
Intervento a convegno
Bianchi, G., Di Stefano, A., Giaconia, C., Scalia, L., Terrazzino, G., & Tinnirello, I. (2007). Experimental assessment of the backoff behavior of commercial IEEE 802.11b network cards. In INFOCOM 2007. 26th IEEE International Conference on Computer Communications. IEEE (pp.1181-1189). NEW YORK : IEEE [10.1109/INFCOM.2007.141].
Bianchi, G; Di Stefano, A; Giaconia, C; Scalia, L; Terrazzino, G; Tinnirello, I
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/26154
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