Journal ArticleDOI
Performance analysis of IEEE 802.11 MAC protocols in wireless LANs
TLDR
It is demonstrated that the exponential distribution is a good approximation model for the MAC layer service time for the queueing analysis, and the presented queueing models can accurately match the simulation data obtained from ns-2 when the arrival process at MAC layer is Poissonian.Abstract:
Summary IEEE 802.11 MAC protocol is the de facto standard for wireless local area networks (LANs), and has also been implemented in many network simulation packages for wireless multi-hop ad hoc networks. However, it is well known that, as the number of active stations increases, the performance of IEEE 802.11 MAC in terms of delay and throughput degrades dramatically, especially when each station’s load approaches its saturation state. To explore the inherent problems in this protocol, it is important to characterize the probability distribution of the packet service time at the MAC layer. In this paper, by modeling the exponential backoff process as a Markov chain, we can use the signal transfer function of the generalized state transition diagram to derive an approximate probability distribution of the MAC layer service time. We then present the discrete probability distribution for MAC layer packet service time, which is shown to accurately match the simulation data from network simulations. Based on the probability model for the MAC layer service time, we can analyze a few performance metrics of the wireless LAN and give better explanation to the performance degradation in delay and throughput at various traffic loads. Furthermore, we demonstrate that the exponential distribution is a good approximation model for the MAC layer service time for the queueing analysis, and the presented queueing models can accurately match the simulation data obtained from ns-2 when the arrival process at MAC layer is Poissonian. Copyright # 2004 John Wiley & Sons, Ltd.read more
Citations
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Journal ArticleDOI
Queuing Analysis for IEEE 802.11e Networks in Non-Saturation Environments:
TL;DR: An analytical model for the performance evaluation of an IEEE 802.11e network in non-saturation environments is presented and the probability distribution of the MAC layer is characterized.
Proceedings ArticleDOI
Dynamic Channel Selection for Real-Time Safety Message Communication in Vehicular Networks
TL;DR: MC-Safe is proposed, a multi-channel V2V communication framework that monitors all the available channels and dynamically selects the best one for safety message transmission and features a novel channel negotiation scheme that allows all the vehicles involved in a potential accident to work collaboratively, in a distributed manner, for identifying a communication channel that meets the delay requirement.
Proceedings ArticleDOI
A Link-Layer Channel Model for IEEE 802.11 Ad Hoc Networks
Atef Abdrabou,Weihua Zhuang +1 more
TL;DR: A novel stochastic link-layer channel model for IEEE 802.11 ad hoc networks that characterizes the variations of the channel service process in a non-saturated case using a Markov-modulated Poisson process (MMPP) model is presented.
Journal ArticleDOI
Performance Evaluation of IEEE 802.11e Medium Access Control in Fiber-fed Networks
TL;DR: In this article, the effect of the additional optical path delay on the effectiveness of the new mechanisms of the IEEE 802.11e extension for efficiency increase, i.e., the burst transmission, and new ACK policies have been investigated.
Dissertation
On Wireless Local Area Networks
TL;DR: This thesis reports on research into WLANs, especially IEEE 802.11 networks, and presents `H-RCA', a highly adaptive and collision-aware rate control algorithm that gives similar and accurate predictions when the clients in the wireless network are symmetrically loaded.
References
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Journal ArticleDOI
Performance analysis of the IEEE 802.11 distributed coordination function
TL;DR: In this paper, a simple but nevertheless extremely accurate, analytical model to compute the 802.11 DCF throughput, in the assumption of finite number of terminals and ideal channel conditions, is presented.
Proceedings ArticleDOI
A performance comparison of multi-hop wireless ad hoc network routing protocols
TL;DR: The results of a derailed packet-levelsimulationcomparing fourmulti-hopwirelessad hoc networkroutingprotocols, which cover a range of designchoices: DSDV,TORA, DSR and AODV are presented.
Book
Fundamentals of queueing theory
TL;DR: The Fundamentals of Queueing Theory, Fourth Edition as discussed by the authors provides a comprehensive overview of simple and more advanced queuing models, with a self-contained presentation of key concepts and formulae.
Proceedings ArticleDOI
Performance comparison of two on-demand routing protocols for ad hoc networks
TL;DR: It is demonstrated that even though DSR and AODV share a similar on-demand behavior the differences in the protocol mechanics can lead to significant performance differentials.
Journal ArticleDOI
Performance comparison of two on-demand routing protocols for ad hoc networks
TL;DR: It is demonstrated that even though DSR and AODV share similar on-demand behavior, the differences in the protocol mechanics can lead to significant performance differentials.