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Modeling fast link adaptation-based 802.11n distributed coordination function

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Abstract

This paper presents a comprehensive performance study of closed-loop fast link adaptation (FLA) in the context of IEEE 802.11n, spanning the physical (PHY) and medium-access control (MAC) layers. In particular, a semi-analytical model is derived for Basic and request to send/clear to send (RTS/CTS) access schemes of the distributed coordination function (DCF), that applies to both, open- and closed-loop strategies. Numerical results serve to demonstrate the accuracy of the proposed model and the superiority of FLA, in terms of MAC goodput, in comparison to open-loop policies. Realistic operating conditions such as outdated feedback information and the use of statistical packet length distributions, issues not treated in previous studies, have also been considered. Moreover, it is shown that incorporating a time-out mechanism in the FLA scheme, weighing down the influence of channel information as this becomes outdated, is a useful strategy to counteract its deleterious effects.

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Notes

  1. Wrapper control frame that encapsulates the ACK and the HT control field required to feedback the MCS selection.

  2. Slot with a lower probability to be accessed than the average (see [15] for more details).

  3. Configured to m max =4 or m max =6 in order to be compared to the new model using m max =6 with R=4 or R=7, respectively.

  4. The Jain’s fairness measure used in this paper is calculated as \(I=\frac{ (\sum^{n}_{i}\beta_{i} )^{2}}{n\sum^{n}_{i} \beta_{i}^{2}}\) where β i denotes the average number of transmissions for STA i. Note that \(I=\frac{1}{n}\) implies an unfair system and I=1 reflects a completely fair system.

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Authors and Affiliations

  1. Mobile Communications Group, Department of Mathematics and Informatics, University of the Balearic Islands, 07122, Majorca, Spain

    Gabriel Martorell, Felip Riera-Palou & Guillem Femenias

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  1. Gabriel Martorell
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  2. Felip Riera-Palou
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  3. Guillem Femenias
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Correspondence to Gabriel Martorell.

Additional information

This work has been partially funded by MEC and FEDER through project COSMOS (TEC2008-02422), AM3DIO (TEC2011-25446) and Conselleria d’Educació, Cultura i Universitats del Govern de les Illes Balears through a PhD grant.

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Martorell, G., Riera-Palou, F. & Femenias, G. Modeling fast link adaptation-based 802.11n distributed coordination function. Telecommun Syst 56, 215–227 (2014). https://doi.org/10.1007/s11235-013-9831-x

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