Understanding 802.11e contention-based prioritization mechanisms and their coexistence with legacy 802.11 stations

Bianchi, Giuseppe; Tinnirello, Ilenia; Scalia, Luca

doi:10.1109/mnet.2005.1470680

Cited by 133 publications

(101 citation statements)

References 5 publications

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“…We entirely agree with Bianchi et al [76] that in wireless architectures, the service differentiation mechanism must be compulsory introduced as medium access control (MAC) layer extension and analyzing the state-of-the-art approaches described in this paper, we may…”

Section: Real-time Framework For Csma-based Networksupporting

confidence: 90%

Survey of Real-Time Communication in CSMA-Based Networks

Moraes

Vasques

Portugal

2010

NPA

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The purpose of this paper is to survey the state-of-the-art on real-time (RT) communication in CSMA-based networks and to identify the most suitable approaches to deal with the requirements imposed by next generation communication environments. The paper focuses in the two of the most relevant solutions that operate in shared broadcast environments, according to the CSMA medium access protocol (IEEE 802.3/802.11). RT communication solutions are classified according to two classification axes. The first axis is related to how collisions are dealt with. A second classification axis is related to the compatibility degree achieved by each of the proposed approaches. Finally, a RT communication framework that is adequate to support RT communication in shared environments is briefly discussed.

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Section: Real-time Framework For Csma-based Networksupporting

confidence: 90%

Survey of Real-Time Communication in CSMA-Based Networks

Moraes

Vasques

Portugal

2010

NPA

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“…The introduction of more efficient medium access control (MAC) protocols such as the IEEE 802.11e has improved to a certain degree the performance of multimedia applications over legacy 802.11b, but has not achieved the desired optimization of the offered resources. This has been shown by many works published in [1] [2] [3] and [4].…”

Section: Introductionsupporting

confidence: 56%

Optimized WLAN MAC protocol for multimedia applications

Zen

Habibi

Rassau

et al. 2008

2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08)

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Abstract-In this paper we propose an optimized WLAN MAC protocol for multimedia applications. The proposed MAC protocol consist of 3 main optimizing architectures, traffic segregation, specific service interval (SI) for voice and video traffic and smaller contention window (CW). Traffic segregation segregates real-time traffic from best-effort traffic while specific service interval provides voice and video traffic with the SI based on its mean arrival rate. In the contention time frame, the CW is made smaller to reduce delay and increase throughput. Ns2 is used as a simulating tool to compare the results of our proposed protocol with the legacy 802.11 and the 802.11e protocols. We show that our protocol has significantly better throughput than the legacy 802.11 and the 802.11e. Fluctuations in the throughput is also shown to be lower in our proposed protocol. The technique implemented also provides easier and better management of realtime traffic to support guaranteed quality of service (QoS).

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“…With Γ i , the control algorithm in QAP i compares its local delay Q i (t + 1) with Γ i and adopts BQPSE parameters according to the comparison result. As the primary means to control the channel access, we use BIFS among several BQPSE parameters [11]. This is because inter-frame space (IFS) differentiation is shown to be more effective than contention window differentiation [11].…”

Section: Adjustment Of Inter-bss Qos Parametersmentioning

confidence: 99%

“…As the primary means to control the channel access, we use BIFS among several BQPSE parameters [11]. This is because inter-frame space (IFS) differentiation is shown to be more effective than contention window differentiation [11]. However, other parameters including BCW min and BTXOP also can be readily used.…”

Section: Adjustment Of Inter-bss Qos Parametersmentioning

confidence: 99%

QoS provisioning for large-scale multi-ap WLANs

Choi¹,

Shin²

2012

Ad Hoc Networks

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Large-scale deployment of IEEE 802.11 wireless LANs (WLANs) with a high density of access points (APs) has become commonplace due mainly to its potential for numerous benefits, such as ubiquitous service coverage, seamless handover, and improved link quality. However, the increased AP density can induce significant channel contention among neighboring cells, thus causing severe performance degradation and throughput imbalance between cells. There have been a plethora of research efforts to improve the WLAN performance, but most of them focused only on single WLAN environments without accounting for intercell contention. The de facto QoS provisioning mechanism for WLANs, i.e., the Enhanced Distributed Channel Access (EDCA), is no exception to this. The EDCA focuses only on inter-flow priority distinction and has not considered the effect of inter-cell contention which significantly restricts its efficiency. This paper presents an enhanced QoS provisioning framework that takes into account inter-cell level differentiation as well as inter-flow level priority, which may be viewed as extension of QoS provisioning from a single-WLAN domain to a multi-WLAN domain. We also propose an architecture for managing multi-AP systems in which a central controller regulates the wireless channel occupancy of APs by adaptively configuring the cell-level QoS parameters. Our extensive simulation results show that the proposed inter-AP cooperative QoS scheme overcomes the limit of legacy 802.11e and provides a high level of fairness in large-scale denselydeployed WLANs.

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Understanding 802.11e contention-based prioritization mechanisms and their coexistence with legacy 802.11 stations

Cited by 133 publications

References 5 publications

Survey of Real-Time Communication in CSMA-Based Networks

Survey of Real-Time Communication in CSMA-Based Networks

Optimized WLAN MAC protocol for multimedia applications

QoS provisioning for large-scale multi-ap WLANs

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