NDLI: Analytical models for capacity estimation of IEEE 802.11 WLANs using DCF for internet applications

Content Provider	Springer Nature Link
Author	Kuriakose, George Harsha, Sri Kumar, Anurag Sharma, Vid
Copyright Year	2007
Abstract	We provide analytical models for capacity evaluation of an infrastructure IEEE 802.11 based network carrying TCP controlled file downloads or full-duplex packet telephone calls. In each case the analytical models utilize the attempt probabilities from a well known fixed-point based saturation analysis. For TCP controlled file downloads, following Bruno et al. (In Networking ’04, LNCS 2042, pp.␣626–637), we model the number of wireless stations (STAs) with ACKs as a Markov renewal process embedded at packet success instants. In our work, analysis of the evolution between the embedded instants is done by using saturation analysis to provide state dependent attempt probabilities. We show that in spite of its simplicity, our model works well, by comparing various simulated quantities, such as collision probability, with values predicted from our model. Next we consider N constant bit rate VoIP calls terminating at N STAs. We model the number of STAs that have an up-link voice packet as a Markov renewal process embedded at so called channel slot boundaries. Analysis of the evolution over a channel slot is done using saturation analysis as before. We find that again the AP is the bottleneck, and the system can support (in the sense of a bound on the probability of delay exceeding a given value) a number of calls less than that at which the arrival rate into the AP exceeds the average service rate applied to the AP. Finally, we extend the analytical model for VoIP calls to determine the call capacity of an 802.11b WLAN in a situation where VoIP calls originate from two different types of coders. We consider N $_{1}$ calls originating from Type 1 codecs and N $_{2}$ calls originating from Type 2 codecs. For G711 and G729 voice coders, we show that the analytical model again provides accurate results in comparison with simulations.
Starting Page	259
Ending Page	277
Page Count	19
File Format	PDF
ISSN	10220038
Journal	Wireless Networks
Volume Number	15
Issue Number	2
e-ISSN	15728196
Language	English
Publisher	Springer US
Publisher Date	2007-08-07
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	TCP throughput on WLAN VoIP on WLAN Capacity of WLAN Performance modeling of DCF Business Information Systems Electrical Engineering Computer Communication Networks Communications Engineering, Networks
Content Type	Text
Resource Type	Article
Subject	Computer Networks and Communications Information Systems Electrical and Electronic Engineering

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