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
Service time analysis of a distributed medium access control scheme
TL;DR: This paper presents a service time distribution analysis of the previously proposed distributed MAC scheme, and the respective distributions of the node service time and the system service time are derived.
Proceedings ArticleDOI
Throughput and Delay Analysis of Half-Duplex IEEE 802.11 Mesh Networks
TL;DR: A novel contributions are the incorporation of a half-duplex contention model, which captures both uplink and downlink traffic, and a generic framework to represent any mesh routing topology (minimum-hop, minimum-airtime, etc.)
Journal ArticleDOI
Fuzzy logic-based performance improvement on MAC layer in wireless local area networks
Cemal Koçak,Hacı Bayram Karakurt +1 more
TL;DR: In this paper, the authors used fuzzy logic-based method to improve the performance of WLANs, OPNET Modeler was used and ideal values were obtained for RSTV, FTV and BS by using fuzzy logic.
Dissertation
Transparent metropolitan vehicular network - design and fast prototyping methodology
TL;DR: This thesis proposes WiMetroNet, a large mesh network of mobile routers operating at layer 2.5 over heterogeneous wireless technologies that is transparent to end terminals that contains an efficient data plane that optimizes the transport of DHCP and ARP traffic, and provides a transparent terminal mobility solution using techniques that minimize the routing overhead for large networks.
Journal ArticleDOI
Optimized energy management for mixed uplink traffic in LTE UE
Vinod Mirchandani,Peter Bertok +1 more
TL;DR: This paper proposes an energy management framework applicable to both discontinuous transmission (DTX) and DRX power saving modes that can reduce UE energy consumption for uplink intensive applications like telemedicine or social networking and a dynamic energy management algorithm for DRX/DTX modes is proposed.
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.