Adaptive Carrier-Sensing for Throughput Improvement in IEEE 802.11 Networks

Haghani, Ehsan; Krishnan, Michael N.; Zakhor, Avideh

doi:10.1109/glocom.2010.5683231

Cited by 24 publications

(17 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, if more of the process were to be implemented at a lower level by card manufacturers in hardware, the estimates may be more accurate since many of the obstacles we had to deal with could be avoided. Future work involves implementing this method in real-time and experimentally verifying the results of [9][10] [11].…”

Section: Discussionmentioning

confidence: 99%

“…We have also demonstrated the accuracy of our proposed estimation method via NS-2 simulations. Furthermore we have shown that these probability estimation techniques can be used to improve overall throughput by as much as 25% via packet length adaptation [10], 50% via carrier sense threshold adaptation [11], and 400% via modulation rate adaptation [9].…”

Section: Introduction and Related Workmentioning

confidence: 99%

See 1 more Smart Citation

Local estimation of collision probabilities in 802.11 WLANs: An experimental study

Christine

Krishnan

et al. 2011

2011 IEEE Wireless Communications and Networking Conference

Self Cite

View full text Add to dashboard Cite

Abstract-Current 802.11 networks do not typically achieve the maximum potential throughput despite link adaptation and crosslayer optimization techniques designed to alleviate many causes of packet loss. A primary contributing factor is the difficulty in distinguishing between various causes of packet loss, including collisions caused by high network use, co-channel interference from neighboring networks, and errors due to poor channel conditions. In previous work, we used NS-2 simulations to show that estimating various components of loss probability such as direct collisions, staggered collisions, and physical layer errors, can be used to improve the throughput of 802.11 networks via link adaptation, carrier sense threshold adaptation, and MAC layer packet length adaptation. We have also proposed a method to estimate the various components of loss probability by comparing channel occupancy at a station with that of its access point. In this paper, we use Ath5k open source wireless card driver in an experimental testbed in order to experimentally verify the accuracy of our previously proposed approach to estimating collision probability. We show that our proposed methodology accurately estimates overall collision probability to within 5%. This experimental verification demonstrates the feasibility of our collision probability estimation approach and the resulting throughput gains in practice.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introduction and Related Workmentioning

confidence: 99%

Local estimation of collision probabilities in 802.11 WLANs: An experimental study

Christine

Krishnan

et al. 2011

2011 IEEE Wireless Communications and Networking Conference

Self Cite

View full text Add to dashboard Cite

show abstract

“…3) Adaptive Carrier-Sensing for Throughput Improvement in IEEE 802.11 Networks: Haghani et al [77] use periodic broadcast signals, from the AP, to facilitate adaptive carrier sensing in IEEE802.11 infrastructure-based networks. This approach dictates that all stations in a BSS must record their BUSY/IDLE (B/I) status during every time slot for a measurement period, ∆.…”

Section: A Adaptive Physical Carrier Sensing In Single Access Point mentioning

confidence: 99%

“…Since stations cannot accurately predict the channel status at the AP (due to problem nodes), each node uses both local and received B/I signals when determining the current availability of the channel in [77]. It is necessary for the AP to broadcast this information so that the stations in the BSS can choose their PCST such that the local BI signal mimics that of the AP.…”

Section: A Adaptive Physical Carrier Sensing In Single Access Point mentioning

confidence: 99%

A Survey of Adaptive Carrier Sensing Mechanisms for IEEE 802.11 Wireless Networks

Thorpe

Murphy

2014

IEEE Commun. Surv. Tutorials

View full text Add to dashboard Cite

Abstract-This survey provides a comprehensive review of existing physical carrier sensing enhancements for IEEE 802.11 wireless networks. The original physical carrier sensing mechanism, used by wireless stations to gain access to the medium, is limited. Consequently, IEEE 802.11 networks are vulnerable to the presence of hidden and exposed nodes. Such nodes can significantly decrease system performance by increasing the collision rate and decreasing the channel spatial reuse. The value of the physical carrier sensing threshold is a key factor influencing the presence of hidden and exposed nodes in a wireless network. Several enhancements have been proposed in the literature, which attempt to mitigate the loss in performance caused by the limited carrier sensing. Firstly, the notion of an optimum carrier sensing threshold has been studied, and results indicate that it can be tuned to an optimum value. Building on the positive early results, further work was performed to develop mechanisms that dynamically adjust the threshold according to varying network conditions. This article presents an in-depth survey of the existing literature in the area, detailing the various approaches and their efficacy in addressing the problem of hidden and exposed nodes (and consequently increasing performance). It offers a comparison of the techniques, by evaluating the models, limitations, assumptions, and performance gains.

show abstract

“…Another benefit of implementing carrier sense is to improve throughput of wireless communication [33] [12]. Basically, they all leverage collision reduction property of carrier sense to improve channel utilization.…”

Section: B Motivation Of Csma/sfmentioning

confidence: 99%

CSMA/SF: Carrier Sense Multiple Access with Shortest First

Wang

2014

IEEE Trans. Wireless Commun.

View full text Add to dashboard Cite

Abstract-Energy efficiency is the main concern in wireless sensor networks (WSNs) due to devices' limited battery power. Because the heavy burden of nodes that near the sink, this "energy hole problem" makes nodes near the sink have faster energy depletion than others. Because of this, the lifetime of WSNs, to some extent, is determined by the power consumption of communication between sink and sensing nodes that near the sink. To address this issue, we propose CSMA/SF (Shortest First) protocol to reduce power consumption of sink-node communication by minimizing energy cost in carrier sense during nodes' channel contention. CSMA/SF modifies existed CSMA/CA MAC protocol. Instead of complete contention-based, CSMA/SF ensures nodes remaining shorter message has higher priority in contention by implementing a distributed scheduling algorithm and incorporating Length Detection scheme. Further, CSMA/SF employs an Anti-Starvation mechanism to solve the starvation problem of shortest-first protocol. CSMA/SF also optimizes channel utilization by reducing the probability of collisions. We have implemented CSMA/SF into USRP2 platform and also conducted comprehensive simulations. The experimental results show that CSMA/SF can reduce overall energy consumption by around 20%. CSMA/SF can improve channel utilization up to 40%.Index Terms-Energy efficiency, CSMA, MAC.

show abstract

Adaptive Carrier-Sensing for Throughput Improvement in IEEE 802.11 Networks

Cited by 24 publications

References 11 publications

Local estimation of collision probabilities in 802.11 WLANs: An experimental study

Local estimation of collision probabilities in 802.11 WLANs: An experimental study

A Survey of Adaptive Carrier Sensing Mechanisms for IEEE 802.11 Wireless Networks

CSMA/SF: Carrier Sense Multiple Access with Shortest First

Contact Info

Product

Resources

About