Nonsaturation throughput analysis of IEEE 802.11 distributed coordination function

Senthilkumar, T.D.; Krishnan, A.; Kumar, Puli Kishore

doi:10.1109/icece.2008.4769255

Cited by 12 publications

(5 citation statements)

References 7 publications

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“…By substituting (9) in (10), we obtain (11). It is notable that, when m = 0, that is, no exponential backoff is considered, and assuming Pcap = P pl = 0, the probability τ results in independent of collision probability under a saturated traffic condition:…”

Section: Modeling Of Dcfmentioning

confidence: 99%

“…Their model is very accurate when the contention level of a network is high. In [11], we extended [3] and presented the non-saturation throughput analysis for the heterogeneous traffic. Hadzi-Velkov and Spasenovski [12] investigated the impact of capture effect on IEEE 802.11 basic service set under the influence of Rayleigh fading and near/far effect.…”

Section: Introductionmentioning

confidence: 99%

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Throughput analysis of the IEEE 802.11 distributed coordination function considering erroneous channel and capture effects

Kumar¹,

Krishnan²

2011

Int. J. Autom. Comput.

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This paper presents a performance study of the distributed coordination function (DCF) of 802.11 networks considering erroneous channel and capture effects under non-saturated traffic conditions employing a basic access method. The aggregate throughput of a practical wireless local area network (WLAN) strongly depends on the channel conditions. In a real radio environment, the received signal power at the access point from a station is subjected to deterministic path loss, shadowing, and fast multipath fading. The binary exponential backoff (BEB) mechanism of IEEE 802.11 DCF severely suffers from more channel idle time under high bit error rate (BER). To alleviate the low performance of IEEE 802.11 DCF, a new mechanism is introduced, which greatly outperforms the existing methods under a high BER. A multidimensional Markov chain model is used to characterize the behavior of DCF in order to account both non-ideal channel conditions and capture effects.

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Section: Modeling Of Dcfmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Throughput analysis of the IEEE 802.11 distributed coordination function considering erroneous channel and capture effects

Kumar¹,

Krishnan²

2011

Int. J. Autom. Comput.

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“…In the modified model, the packet is discarded after M backoff stages, while in Bianchi's model, the station keeps iterating in the m-th backoff stage until the packet gets successfully transmitted. There are some works on unsaturated traffic condition and post backoff stage for IEEE 802.11 [4,6,7].However, these models are not based on simplifying assumptions that the IEEE 802.11 standard defines a station short Retry count, which is the maximum number of RTS transmission attempts that will be made before a frame is discarded. Typically it is set to 5 or 7 [10,11].…”

Section: Introductionmentioning

confidence: 98%

Throughput analysis of IEEE 802.11b WLAN under a non-saturated condition

Prakash

Thangaraj²

2010

Proceedings of the International Conference and Workshop on Emerging Trends in Technology

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This paper provides a simple and accurate analysis using Markov chain modeling to compute IEEE 802.11 DCF performance, in the presence of channel errors. We extend the analytical model of IEEE 802.11 DCF from Bianchi model to study throughput performance under noisy situation, where the node's transmit queue may be at times empty and then extension of his model to a nonsaturated environment and also we develop an expression for the nonsaturation throughput as a function of the number of stations, packet sizes, and raw channel error rates. The derived analysis, which takes into account packet retry limits, is validated by comparison with NS-2 simulation results. Numerical results and simulations are provided to validate the accuracy of our model and is verified by previous work.

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“…In this model, post backoff is considered in the nonsaturation throughput analysis. In [5], we extended the work of [6] and presented the nonsaturation throughput analysis for heterogeneous traffic. The throughput of the DCF [7] is investigated under the heterogeneous traffic.…”

Section: Introductionmentioning

confidence: 99%

Nonsaturation throughput enhancement of IEEE 802.11b distributed coordination function for heterogeneous traffic under noisy environment

Dhanasekaran

Krishnan

2010

Int. J. Autom. Comput.

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In this paper, we propose a mechanism named modified backoff (MB) mechanism to decrease the channel idle time in IEEE 802.11 distributed coordination function (DCF). In the noisy channel, when signal-to-noise ratio (SNR) is low, applying this mechanism in DCF greatly improves the throughput and lowers the channel idle time. This paper presents an analytical model for the performance study of IEEE 802.11 MB-DCF for nonsaturated heterogeneous traffic in the presence of transmission errors. First, we introduce the MB-DCF and compare its performance to IEEE 802.11 DCF with binary exponential backoff (BEB). The IEEE 802.11 DCF with BEB mechanism suffers from more channel idle time under low SNR. The MB-DCF ensures high throughput and low packet delay by reducing the channel idle time under the low traffic in the network. However, to the best of the authors knowledge, there are no previous works that enhance the performance of the DCF under imperfect wireless channel. We show through analysis that the proposed mechanism greatly outperforms the original IEEE 802.11 DCF in the imperfect channel condition. The effectiveness of physical and link layer parameters on throughput performance is explored. We also present a throughput investigation of the heterogeneous traffic for different radio conditions.

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Nonsaturation throughput analysis of IEEE 802.11 distributed coordination function

Cited by 12 publications

References 7 publications

Throughput analysis of the IEEE 802.11 distributed coordination function considering erroneous channel and capture effects

Throughput analysis of the IEEE 802.11 distributed coordination function considering erroneous channel and capture effects

Throughput analysis of IEEE 802.11b WLAN under a non-saturated condition

Nonsaturation throughput enhancement of IEEE 802.11b distributed coordination function for heterogeneous traffic under noisy environment

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