Enhanced backoff scheme in CSMA/CA for IEEE 802.11

Kuo, Wen-Kuang; Liu, Fang; Kuo, C.-C. Jay

doi:10.1117/12.486778

Cited by 23 publications

(11 citation statements)

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“…Here, [4] and [5] use only r I = r D = 2. Although the EIED in [6] uses other parameters including r I = r D = 2, it is assumed that the EIED uses r I = r D = 2 in this paper.…”

Section: Related Studiesmentioning

confidence: 99%

Transmission History Based Distributed Adaptive Contention Window Adjustment Algorithm Cooperating with Automatic Rate Fallback for Wireless LANs

Ogawa¹,

Hiraguri

Nishimori

et al. 2010

IEICE Trans. Commun.

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This paper proposes and investigates a distributed adaptive contention window adjustment algorithm based on the transmission history for wireless LANs called the transmission-history-based distributed adaptive contention window adjustment (THAW) algorithm. The objective of this paper is to reduce the transmission delay and improve the channel throughput compared to conventional algorithms. The feature of THAW is that it adaptively adjusts the initial contention window (CW init ) size in the binary exponential backoff (BEB) algorithm used in the IEEE 802.11 standard according to the transmission history and the automatic rate fallback (ARF) algorithm, which is the most basic algorithm in automatic rate controls. This effect is to keep CW init at a high value in a congested state. Simulation results show that the THAW algorithm outperforms the conventional algorithms in terms of the channel throughput and delay, even if the timer in the ARF is changed. key words: IEEE 802.11, CSMA/CA, contention window adjustment, automatic rate fallback

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“…Here, [4] and [5] use only r I = r D = 2. Although the EIED in [6] uses other parameters including r I = r D = 2, it is assumed that the EIED uses r I = r D = 2 in this paper.…”

Section: Related Studiesmentioning

confidence: 99%

Transmission History Based Distributed Adaptive Contention Window Adjustment Algorithm Cooperating with Automatic Rate Fallback for Wireless LANs

Ogawa¹,

Hiraguri

Nishimori

et al. 2010

IEICE Trans. Commun.

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“…A station has to countdown the backoff time to zero before accessing the channel to send a packet. From the past work done in this field ( [2] [5] [6] [8] [9]), it can be easily seen that this is one of the most important factor responsible for optimal or non-optimal performance of the IEEE 802.11 MAC protocol. This is a prime parameter, which can make a WLAN operate in the steady state [In steady state, the channel idle time is equal to the collision time].…”

Section: Introductionmentioning

confidence: 99%

Analytical Analysis of IEEE 802.11 MAC

Pachisia¹,

Annappa²

2020

IJSR

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The most important parameters of the IEEE 802.11 MAC protocol, which can help to improve its performance, are collision time, idle time, and number of collisions. In this paper we try to find the contention window size that will make the WLAN operate in the steady state . We find the optimal contention window (CW) only via mathematical equations. It is observed that by proper selection of the contention window size, the network performance can be improved as the network load increases.

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“…The DCF algorithm is simple and robust. However, numerous studies have showed that the ieee 802.11 standard DCF algorithm cannot utilize the limited wireless channel bandwidth efficiently when many stations access the same channel. The main reason for this is that the initial contention window (CW) size remains fixed regardless of traffic activity, whereas ideally, it should vary depending on the number of active stations .…”

Section: Introductionmentioning

confidence: 99%

Enhanced binary exponential backoff algorithm for fair channel access in the ieee 802.11 medium access control protocol

Al-Hubaishi

Alahdal

Alsaqour

et al. 2013

Int J Communication

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SUMMARY The medium access control protocol determines system throughput in wireless mobile ad hoc networks following the ieee 802.11 standard. Under this standard, asynchronous data transmissions have a defined distributed coordination function that allows stations to contend for channel usage in a distributed manner via the carrier sensing multiple access with collision avoidance protocol. In distributed coordination function, a slotted binary exponential backoff (BEB) algorithm resolves collisions of packets transmitted simultaneously by different stations. The BEB algorithm prevents packet collisions during simultaneous access by randomizing moments at stations attempting to access the wireless channels. However, this randomization does not eliminate packet collisions entirely, leading to reduced system throughput and increased packet delay and drop. In addition, the BEB algorithm results in unfair channel access among stations. In this paper, we propose an enhanced binary exponential backoff algorithm to improve channel access fairness by adjusting the manner of increasing or decreasing the contention window based on the number of the successfully sent frames. We propose several configurations and use the NS2 simulator to analyze network performance. The enhanced binary exponential backoff algorithm improves channel access fairness, significantly increases network throughput capacity, and reduces packet delay and drop. Copyright © 2013 John Wiley & Sons, Ltd.

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Enhanced backoff scheme in CSMA/CA for IEEE 802.11

Cited by 23 publications

References 0 publications

Transmission History Based Distributed Adaptive Contention Window Adjustment Algorithm Cooperating with Automatic Rate Fallback for Wireless LANs

Transmission History Based Distributed Adaptive Contention Window Adjustment Algorithm Cooperating with Automatic Rate Fallback for Wireless LANs

Analytical Analysis of IEEE 802.11 MAC

Enhanced binary exponential backoff algorithm for fair channel access in the ieee 802.11 medium access control protocol

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