<title>Performance aspects of IEEE 802.11 wireless local-area networks</title>

Abstract

We are on the threshold of witnessing an explosion of portable and mobile terminals capable of sending and receiving multimedia traffic. Currently, the standard being worked out by the IEEE 802.11 committee to support wireless connectivity in the local area network appears to be the most promising one. IEEE 802.11 protocols support both scheduling and random access techniques operating simultaneously, called Point Coordination Function (PCF) and Distributed Coordination Function (DCF), respectively. In this paper, we study the interactions between PCF and DCF when voice and asynchronous data traffic needs to be supported. We investigate the dimensioning problems of various parameters, and provide the general rule of thumb of the default values. Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/21/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx SPIE Vol. 2917/481 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/21/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

Dynamic tuning of the IEEE 802.11 protocol to achieve a theoretical throughput limit

“…8. 7 This figure compares the capacities of the IEEE 802.11 and IEEE 802.11 protocols with the theoretical bounds. The graphs indicate that the IEEE 802.11 6 The use of a smoothing factor in the estimation of a network figure is widespread in the TCP protocol where the smoothing factor 0.9 is the recommended value [17].…”

“…The graphs indicate that the IEEE 802.11 6 The use of a smoothing factor in the estimation of a network figure is widespread in the TCP protocol where the smoothing factor 0.9 is the recommended value [17]. 7 The performance analysis of the IEEE 802.11 reported in the figure have been obtained by assuming CW = 32. As shown in Table V, when CW = 8 the protocol capacity decreases.…”

Performance Analysis of Contention Based Medium Access Control Protocols

“…There have been several previous works on the performance of DCF; these include simulation studies [1], [2] as well as analytical studies based on simplified models of DCF [3], [4], [5], [6], [7], [8]. Most of the analytical work is based on a decoupling approximation, first proposed by Bianchi in [3]; we henceforth refer to the simplified model with this decoupling assumption as Bianchi's model.…”

Design alternatives for wireless local area networks

“…The 802.11 standard however does not de"ne the implementation of the polling algorithm and leaves it to the PC implementor. Joint simulations of the DCF and PCF in Reference [16] reveal that setting k to 1 is optimal when all time-bounded data are voice data streams. This is explained by the fact that in relation to the duration of the CFP, voice streams are sent in slow on-o!…”