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Wireless Networks

, Volume 18, Issue 8, pp 893–914 | Cite as

Enhancing the performance of TCP over Wi-Fi power saving mechanisms

  • Daniel Camps-MurEmail author
  • Sebastià Sallent-Ribes
Article

Abstract

The Wi-Fi technology is quickly being adopted by new types of devices that pose stringent requirements in terms of energy efficiency. In order to address these requirements the IEEE 802.11 group developed in the recent years several power saving protocols, that are today widely used among devices like smartphones. In this paper we study, by means of analysis and simulation, the effect that these power saving protocols have on the performance/energy trade-off experienced by long lived TCP traffic. Our study unveils that the efficiency of Wi-Fi power saving protocols critically depends on the bottleneck bandwidth experienced by a TCP connection. Based on the obtained insights, we design and evaluate a novel algorithm, BA-TA, which runs in a Wi-Fi station, does not require any modification to existing 802.11 standards, and using only information available at layer two, improves the performance/energy trade off of long lived TCP connections, whilst also exhibiting a notable performance with Web traffic and TCP Streaming.

Keywords

Wireless LAN Power saving TCP MAC layer 

Notes

Acknowledgments

This work is partially supported by the Spanish government through project TEC2010-20527-C02-01.

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  1. 1.NEC Europe Laboratories in HeidelbergHeidelbergGermany
  2. 2.Polytechnic University of Catalonia (UPC)/i2Cat in BarcelonaBarcelonaSpain

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