Multimedia Capacity Analysis of the IEEE 802.11e Contention-Based Infrastructure Basic Service Set

Inan, I.; Keceli, F.; Ayanoğlu, Ender

doi:10.1109/glocom.2008.ecp.250

Cited by 2 publications

(2 citation statements)

References 43 publications

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“…We intentionally do not saturate the high priority AC, so that the lower priority ACs do not starve and the effects of CW and TXOP selection can be observed. This also corresponds to a practical scenario since the traffic load should be well controlled and an admission control algorithm should keep the high priority AC nonsaturated to support parameterized QoS [26], [27].…”

Section: Edca Parameter Analysismentioning

confidence: 99%

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Fair Access Provisioning through Contention Parameter Adaptation in the IEEE 802.11e Infrastructure Basic Service Set

Keceli,

Inan,

Ayanoglu

2008

Preprint

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We present the station-based unfair access problem among the uplink and the downlink stations in the IEEE 802.11e infrastructure Basic Service Set (BSS) when the default settings of the Enhanced Distributed Channel Access (EDCA) parameters are used. We discuss how the transport layer protocol characteristics alleviate the unfairness problem. We design a simple, practical, and standard-compliant framework to be employed at the Access Point (AP) for fair and efficient access provisioning. A dynamic measurement-based EDCA parameter adaptation block lies in the core of this framework. The proposed framework is unique in the sense that it considers the characteristic differences of Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) flows and the coexistence of stations with varying bandwidth or Quality-of-Service (QoS) requirements. Via simulations, we show that our solution provides short-and long-term fair access for all stations in the uplink and downlink employing TCP and UDP flows with non-uniform packet rates in a wired-wireless heterogeneous network. In the meantime, the QoS requirements of coexisting real-time flows are also maintained. The IEEE 802.11 standard [1] defines Distributed Coordination Function (DCF) as a contention-based Medium Access Control (MAC) mechanism. The 802.11e standard [2] updates the MAC layer of the former 802.11 standard for Quality-of-Service (QoS) provisioning. In particular, the Enhanced Distributed Channel Access (EDCA) function of 802.11e is a QoS enhancement of the DCF. The EDCA scheme (similarly to DCF) uses Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) and slotted Binary Exponential Backoff (BEB) mechanism as the basic access method. The major enhancement to support QoS is that EDCA differentiates packets using different priorities and maps them to specific Access Categories (ACs) that use separate queues at a station. Each AC i within a station (0 ≤ i ≤ 3) contends for the channel independently of the others. Levels of services are provided through different assignments of the AC-specific EDCA parameters; Contention Window (CW) sizes, Arbitration Interframe Space (AIFS) values, and Transmit Opportunity (TXOP) limits.

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Section: Edca Parameter Analysismentioning

confidence: 99%

“…Fig [23][24][25][26][27]. show the instantaneous CW min and N T XOP values used at the AP and the stations over the course of simulation for the same scenarios as described above.…”

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confidence: 99%

Fair Access Provisioning through Contention Parameter Adaptation in the IEEE 802.11e Infrastructure Basic Service Set

Keceli,

Inan,

Ayanoglu

2008

Preprint

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Admission and Traffic Control Schemes Suitable for QoS Applications in WLAN Systems

Hiraguri¹,

Kimura²,

Ogawa³

et al. 2012

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This paper proposes the use of admission and traffic control schemes for real-time applications. The admission control scheme determines the admission of high-priority real-time applications such as voice and video streams in terms of their bandwidth utilization time (medium time), whereas the traffic control scheme maintains the communication quality of applications permitted admission by restricting other traffic. Owing to the use of contention-based access, a conventional scheme without admission control will degrade the communication quality when the number of terminals using high-priority applications increases. Moreover, only the capabilities (i.e., frame and sequence procedures) of admission control are defined in the IEEE 802.11e standard; the detailed usage in terms of the application characteristics is not specified, and it may be difficult to achieve a sufficient level of quality of service (QoS). The proposed schemes achieve the optimum QoS for actual services. The software used in the proposed schemes was implemented into hardware at the access point, and was evaluated experimentally. Based on the evaluation results, excellent performances with high QoS applications were obtained

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Multimedia Capacity Analysis of the IEEE 802.11e Contention-Based Infrastructure Basic Service Set

Cited by 2 publications

References 43 publications

Fair Access Provisioning through Contention Parameter Adaptation in the IEEE 802.11e Infrastructure Basic Service Set

Fair Access Provisioning through Contention Parameter Adaptation in the IEEE 802.11e Infrastructure Basic Service Set

Admission and Traffic Control Schemes Suitable for QoS Applications in WLAN Systems

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