Modeling the 802.11 Distributed Coordination Function in Nonsaturated Heterogeneous Conditions

Malone, David; Duffy, Ken R.; Leith, Douglas J.

doi:10.1109/tnet.2006.890136

Cited by 551 publications

(468 citation statements)

References 13 publications

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“…For 802.11-like protocols, Table 1 shows parameters such as the length of idle and busy slots (e.g. see [6], [18] to for their derivation). Note that idle slots are an order of magnitude shorter than successful or collision slots.…”

Section: The Impact Of Schedule Length On Efficiencymentioning

confidence: 99%

Decentralised learning MACs for collision-free access in WLANs

et al. 2012

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Abstract-By combining the features of CSMA and TDMA, fully decentralised WLAN MAC schemes have recently been proposed that converge to collision-free schedules. In this paper we describe a MAC with optimal long-run throughput that is almost decentralised. We then design two schemes that are practically realisable, decentralised approximations of this optimal scheme and operate with different amounts of sensing information. We achieve this by (1) introducing learning algorithms that can substantially speed up convergence to collision free operation; (2) developing a decentralised schedule length adaptation scheme that provides long-run fair (uniform) access to the medium while maintaining collision-free access for arbitrary numbers of stations.

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Section: The Impact Of Schedule Length On Efficiencymentioning

confidence: 99%

Decentralised learning MACs for collision-free access in WLANs

et al. 2012

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“…The model of Malone et al [10] improves the Bianchi model by considering more realistic networks in which the data traffic is considered to be non-saturated and the packet arrival rate is non-uniform. The model enables to estimate the peak throughput.…”

Section: Related Workmentioning

confidence: 99%

Effects of sampling rate on collision probability in hybrid MAC protocols in WSN

Dong

Dargie

Schill

2010

2010 IEEE Globecom Workshops

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Abstract-In wireless sensor networks, energy is a scarce resource. Collision as one of the major sources of the energy waste for medium access control (MAC) protocols has been extensively investigated. However, it is mostly analyzed under the "saturated situation" in which the sampling rate is assumed to be equal to or larger than the transmission rate, which does not reflect the reality in many applications. This paper relaxes this assumption to consider the "unsaturated situation" in which nodes do not always contend to access the media. It focuses on hybrid MAC protocols which enable nodes to define sleeping schedules. We take SMAC as a model protocol to analyze how the sampling rate affects the probability of collision. But the approach can easily be applied to other hybrid protocols such as BMAC and XMAC.

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“…In the modified model, the packet is discarded after m th backoff stages, while in Bianchi's model, the station keeps iterating in the mth backoff stage until the packet gets successfully transmitted. There are some works on unsaturated traffic condition and post backoff stage for IEEE 802.11b (Malone et al, 2007;Dhanasekaran senthil kumar and Krishnan, 2010;Daneshgaran et al, 2008). However, these models are not based on simplifying assumptions that the IEEE 802.11 standard defines a Station Short Retry Count (SSRC), which is the maximum number of RTS transmission attempts that will be made before a frame is discarded Typically it is set to 5or 7 (IEEE Std.…”

Section: Introductionmentioning

confidence: 99%

Analytical Modeling of IEEE 802.11e Enhanced Distributed Channel Access under a Non-Saturation Condition

Prakash¹

2011

Journal of Computer Science

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Problem statement: The IEEE 802.11e EDCA protocol with different access Categories (ACs) supporting for Quality-of-Service (QoS). Due to internal or external packet collision, the Contention Window (CW) of the station increases the channel idle time under high Bit Error Rate (BER). Approach: In this study, we propose an analytical model for performance evaluation of IEEE 802.11e EDCA scheme under non-saturation condition and error prone channel. The new markov chain model have decrease the channel idle time in IEEE 802.11 EDCA and considerably increases the throughput for minimum number of station. Results: We develop an expression for the nonsaturation throughput as a function of the number of stations, packet sizes and BER. Conclusion: We validate the accuracy of our analysis with simulation expression. Using this model, the contention factors can be set appropriately to attain particular Quality-of-Service (QoS) requirements.

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Modeling the 802.11 Distributed Coordination Function in Nonsaturated Heterogeneous Conditions

Cited by 551 publications

References 13 publications

Decentralised learning MACs for collision-free access in WLANs

Decentralised learning MACs for collision-free access in WLANs

Effects of sampling rate on collision probability in hybrid MAC protocols in WSN

Analytical Modeling of IEEE 802.11e Enhanced Distributed Channel Access under a Non-Saturation Condition

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