Improving fairness in IEEE 802.11 using enhanced carrier sensing

Li, Z.; Nandi, Sukumar; Gupta, Anil Kumar

doi:10.1049/ip-com:20040662

Cited by 16 publications

(10 citation statements)

References 5 publications

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“…Many studies have been undertaken, in different research fields, to explicitly examine the relationship between the MAC and the PHY layers. Results from these studies [28], [29], [30], [31], [32] highlight the importance of considering the impact of the PHY on the MAC, thus, provide motivation for performing such an investigation in adaptive PCS.…”

Section: On Physical Carrier Sensing In Wireless Ad-hoc Networkmentioning

confidence: 99%

“…Consequently, hidden nodes are particularly prevalent in IEEE802.11 wireless ad-hoc networks and WMNs. Moreover, a significant number of studies have shown that VCS is fundamentally limited in mitigating hidden node interference in these architectures [13], [14], [28], [38]. This section describes current adaptive carrier sensing mechanisms and protocols, designed to overcome the deficiencies of the CSMA/CA algorithm in wireless ad-hoc networks.…”

Section: Adaptive Physical Carrier Sensing In Ieee 80211 Wirelessmentioning

confidence: 99%

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

Thorpe

Murphy

2014

IEEE Commun. Surv. Tutorials

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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.

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Section: On Physical Carrier Sensing In Wireless Ad-hoc Networkmentioning

confidence: 99%

Section: Adaptive Physical Carrier Sensing In Ieee 80211 Wirelessmentioning

confidence: 99%

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

Thorpe

Murphy

2014

IEEE Commun. Surv. Tutorials

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“…The carrier sensing mechanism for the MAC layer behaved as if the minimum reception threshold was not modified. If the carrier sensing mechanism were changed, the collision avoidance attributes, spatial reuse [29][30][31] and medium access [32] would be affected. Table 5.…”

Section: Simulation Environmentmentioning

confidence: 99%

Perceptive admission control for wireless network quality of service

2007

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As wireless networks become more widely used, there is a growing need to support advanced services, such as multimedia streaming and voice over IP. Traditional approaches to guarantee quality of service (QoS) work well only with predictable channel and network access. In wireless mobile networks, where conditions dynamically change as nodes move about the network, a stateless, high level approach is required. Since shared wireless resources are easily over-utilized, the load in the network must be controlled so that an acceptable QoS for real-time applications can be maintained. If minimum real-time requirements are not met, these unusable packets waste scarce bandwidth and hinder other traffic, compounding the problem. To enable high QoS for all admitted traffic, we propose the Perceptive Admission Control (PAC) protocol. PAC monitors the wireless channel and dynamically adapts admission control decisions to enable high network utilization while preventing congestion. Through discussion, simulations and testbed experiments, we demonstrate that PAC ensures low packet loss and delay for all admitted flows.

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“…It is worth noting that throughput of 802.11 networks may be enhanced by attending to many different aspects of the 802.11 MAC protocol; this is the subject of extensive work, such as [7] [8] [12] to cite a few. Hence maximizing network performance must be a careful combination of approaches addressing multiple aspects (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…This has it's limitations; the overhead due to the additional RTS/CTS handshake is not justified when the data payload size is small. More significantly, it has been shown that virtual carrier sensing has fundamental limitations in avoiding interference from hidden terminals in mesh networks [7] [10] [11] [12], i.e. there are many scenarios where it is conservative and fails to suppress packet collisions as intended.…”

Section: Introductionmentioning

confidence: 99%

Adapting physical carrier sensing to maximize spatial reuse in 802.11 mesh networks

Zhu

Guo

Yang

et al. 2004

Wireless Communications

117

112

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Spatial reuse in a mesh network can allow multiple communications to proceed simultaneously, hence proportionally improve the overall network throughput. To maximize spatial reuse, the MAC protocol must enable simultaneous transmitters to maintain the minimal separation distance that is sufficient to avoid interference. This paper demonstrates that physical carrier sensing enhanced with a tunable sensing threshold is effective at avoiding interference in 802.11 mesh networks without requiring the use of virtual carrier sensing. We present an analytical model for deriving the optimal sensing threshold given network topology, reception power, and data rate. A distributed adaptive scheme is also presented to dynamically adjust the physical carrier sensing threshold based on periodic estimation of channel conditions in the network. Simulation results are shown for large-scale 802.11b and 802.11a networks to validate both the analytical model and the adaptation scheme. It is demonstrated that the enhanced physical carrier sensing mechanism effectively improves network throughput by maximizing the potential of spatial reuse. With dynamically tuned physical carrier sensing, the end to end throughput approaches 90% of the predicted theoretical upper-bound assuming a perfect MAC protocol, for a regular chain topology of 90 nodes.

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Improving fairness in IEEE 802.11 using enhanced carrier sensing

Cited by 16 publications

References 5 publications

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

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

Perceptive admission control for wireless network quality of service

Adapting physical carrier sensing to maximize spatial reuse in 802.11 mesh networks

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