NDLI: Modeling the effect of transmission errors on TCP controlled transfers over infrastructure 802.11 wireless LANs

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Modeling the effect of transmission errors on TCP controlled transfers over infrastructure 802.11 wireless LANs

Content Provider	ACM Digital Library
Author	Kumar, Anurag Krishnasamy, Subhashini
Abstract	There have been several studies on the performance of TCP controlled transfers over an infrastructure IEEE 802.11 WLAN, assuming perfect channel conditions. In this paper, we develop an analytical model for the throughput of TCP controlled file transfers over the IEEE 802.11 DCF with different packet error probabilities for the stations, accounting for the effect of packet drops on the TCP window. Our analysis proceeds by combining two models: one is an extension of the usual TCP-over-DCF model for an infrastructure WLAN, where the throughput of a station depends on the probability that the head-of-the-line packet at the Access Point belongs to that station; the second is a model for the TCP window process for connections with different drop probabilities. Iterative calculations between these models yields the head-of-the-line probabilities, and then, performance measures such as the throughputs and packet failure probabilities can be derived. We find that, due to MAC layer retransmissions, packet losses are rare even with high channel error probabilities and the stations obtain fair throughputs even when some of them have packet error probabilities as high as 0.1 or 0.2. For some restricted settings we are also able to model tail-drop loss at the AP. Although involving many approximations, the model captures the system behavior quite accurately, as compared with simulations.
Starting Page	275
Ending Page	284
Page Count	10
File Format	PDF
ISBN	9781450308984
DOI	10.1145/2068897.2068946
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2011-10-31
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Modeling tcp over 802.11 csma/ca Performance analysis Wlans Channel errors
Content Type	Text
Resource Type	Article

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