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Stochastic Modeling of WiFi's EDCA and Double Frequency Reuse for Femtocell

Abstract : The race toward higher throughputs for cellular network users is getting more difficult every day. The new "Femtocell" technology is expected to be the rescuer of cellular network operators. This "home" cellular base station provides high indoor coverage and throughput to indoor users over the regular home broadband access connection to the internet. In this thesis, we evaluate the capacity that can be offered by the WiFi and Femtocell technologies separately. In the first part we propose a realistic and comprehensive model to analyze the performance of the IEEE 802.11e EDCA contention based access mechanism, which provides QoS to IEEE 802.11 WLAN. Our analytical approach is based on Markov chains. Our innovation is that our model allows for non-ideal channels and unsaturated networks. The improved model allows computing and representing the performance more precisely for various traffic loads and various BER. Then we assess the performance of the femtocell approach. For this purpose, we first needed to deal with the radio planning issue. This latter issue is not obvious for a plug-and-play Femtocell device whose deployment will inherently be unpredictable. We propose a double frequency reuse scheme, which allows a femtocell to reuse the frequency already in use by adjacent sectors of the overlaying macrocell. We present three solutions: full, partial or mixed frequency reuse. Then we evaluate the performance that Femtocells can achieve when coexisting with an overlaying macrocell in terms of RSS and SINR expected at the femtocell level. We show that Femtocells can definitely provide a meaningful improvement in the data rates experienced by the femtocell user's equipment.
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https://pastel.archives-ouvertes.fr/pastel-00561406
Contributor : Yoram Haddad <>
Submitted on : Tuesday, February 1, 2011 - 11:02:55 AM
Last modification on : Friday, July 31, 2020 - 10:44:07 AM
Long-term archiving on: : Saturday, December 3, 2016 - 1:46:22 PM

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  • HAL Id : pastel-00561406, version 1

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Yoram Haddad. Stochastic Modeling of WiFi's EDCA and Double Frequency Reuse for Femtocell. Networking and Internet Architecture [cs.NI]. Télécom ParisTech, 2010. English. ⟨pastel-00561406⟩

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