Impact of error characteristics of an indoor 802.11g WLAN on TCP retransmissions

Ritesh Taank*, Xiao-Hong Peng

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this paper we present the results of extensive measurements made over an experimental wired-to-wireless testbed, which consisted of a TCP protocol combined with a real-world indoor IEEE 802.11g WLAN. We investigated the effects of signal attenuation due to client distance from the AP on the 802.11 frame error rates (FER) and consequently on the segment loss rates and retransmission behavior of TCP at the sender in the fixed network. Specifically, we experimented with different modulation schemes belonging to the OFDM 802.11g PHY in order to gauge differences in performance between them, comparing real-world FERs calculated from actual frame captures against SNR, for both the forward and reverse WLAN channel directions. We also present real-world distributions of frame retransmissions made over the WLAN by the AP, with useful findings. Our results confirm that the reverse channel of a WLAN possesses a higher FER than the forward channel, and poses a greater threat to TCP's retransmission mechanism.

Original languageEnglish
Title of host publication2008 International Conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2008
DOIs
Publication statusPublished - 31 Dec 2008
Event2008 International Conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2008 - Dalian, United Kingdom
Duration: 12 Oct 200814 Oct 2008

Conference

Conference2008 International Conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2008
CountryUnited Kingdom
CityDalian
Period12/10/0814/10/08

Keywords

  • 802.11
  • Frame errors
  • OFDM
  • Retransmissions
  • TCP

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    Taank, R., & Peng, X-H. (2008). Impact of error characteristics of an indoor 802.11g WLAN on TCP retransmissions. In 2008 International Conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2008 [4678989] https://doi.org/10.1109/WiCom.2008.1081