Service differentiation of IEEE 802.11 wireless LAN with Poisson packet arrivals

Authors:
Shun-Ping Chung;Wei-Sin Chen
Affiliations:
National Taiwan University of Science and Technology, Department of Electrical Engineering, Taipei, Taiwan, ROC;National Taiwan University of Science and Technology, Department of Electrical Engineering, Taipei, Taiwan, ROC
Venue:
ICCOM'06 Proceedings of the 10th WSEAS international conference on Communications
Year:
2006

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Abstract

We propose two analytical models using discrete-time Markov chain to compute the throughput and delay for IEEE 802.11 WLAN. Instead of assuming that there is always a frame at each station ready to send, we consider the more realistic Poisson arrival traffic model. Although we study only the RTS/CTS access mechanism, the analysis can be easily extended to the basic access mechanism. Furthermore, each station has a finite queue and is modeled as an M/M/1 queueing system to compute the steady-state probability distribution. In order to support service differentiation, we employ priority schemes in DCF. Two parameters in DCF are set according to the user's priority: initial window size and window increasing factor. The effects of number of users on the performance measures of interest for each class of users are shown via both analytical methods. Last but not least, computer simulation program written in C language is run to verify the accuracy of the analytical results.