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Fair and Efficient TCP Access in IEEE 802.11 WLANs

Summary: Fair and Efficient TCP Access
in IEEE 802.11 WLANs
Feyza Keceli, Inanc Inan, and Ender Ayanoglu
Center for Pervasive Communications and Computing, Department of Electrical Engineering and Computer Science
The Henry Samueli School of Engineering, University of California, Irvine
Email: {fkeceli, iinan, ayanoglu}@uci.edu
Abstract-- We illustrate the transport layer unfairness problem
in the IEEE 802.11 Wireless Local Area Networks (WLANs). We
propose a novel and simple analytical model to calculate the per-
flow congestion window limit that provides fair TCP access in
a wired/wireless scenario where the wireless hop is an 802.11
link. The proposed analysis is unique in that it considers the
effects of varying number of uplink and downlink TCP flows,
varying Round Trip Times (RTTs) of TCP connections, and the
use of delayed TCP Acknowledgment (ACK) mechanism. The
comparison with simulation results validates the accuracy of the
analytical estimations on the congestion window limit. When the
TCP connections use the congestion window limits calculated
from the proposed model, not only fair access can be provisioned,
but also the channel can be utilized efficiently in a wide range


Source: Ayanoglu, Ender - Department of Electrical and Computer Engineering, University of California, Irvine


Collections: Engineering