Providing variable TXOP for IEEE 802.11e HCCA real-time networks

Cecchetti, Gabriele; Ruscelli, Anna Lina; Mastropaolo, Antonia; Lipari, Giuseppe

doi:10.1109/wcnc.2012.6214020

Cited by 24 publications

(20 citation statements)

References 20 publications

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“…These types of solutions, although feasible, result in the degradation of the overall bandwidth utilization when the data rate decreases. Another approach to handle fluctuating and VBRs is to apply a bandwidth reclaiming scheme …”

Section: Related Workmentioning

confidence: 99%

“…Another approach to handle fluctuating and VBRs is to apply a bandwidth reclaiming scheme. [11][12][13][14] A prediction scheme was proposed, 15 namely, the HCCA scheduler that dynamically modifies the default arbitration inter-frame space number (AIFSN) values with the aim of enhancing the voice and video communications. The prediction scheme is implemented by carrying out the construction of a J48 decision tree classifier.…”

Section: Related Workmentioning

confidence: 99%

See 1 more Smart Citation

High performing multimedia transmission approach based on QoS support and admission control over IEEE 802.11e networks

Al-Maqri

Mansoor

Sabri

et al. 2020

Int J Communication

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Summary Hybrid coordination function controlled channel access (HCCA) is a medium to enhance quality of service (QoS) via the IEEE 802.11e standard. The main limitation of HCAA is that it is only efficient for constant bit rate (CBR) applications. This is due to the nature of its scheduler that allocates transmission opportunities (TXOPs) based on traffic stream (TS) specifications (TSPECs) that are determined during the traffic setup time. Variable bit rate (VBR) traffics used in HCCA have nondeterministic profile, making it not optimally and efficiently supported by HCCA. The result of this inefficiency is a deterioration of the transmission performance of multimedia data as well as a drop in the number of served QoS video traffics. We propose a novel approach to deal with this issue, which is the feedback‐based admission control unit (FACU). FACU works by optimizing the usage of extra bandwidth to ensure optimal transmission performance of multimedia data. FACU achieves this by exploiting piggybacked information concerning sequential video frames in order to accurately assign the TXOP. The proposed approach is evaluated by utilizing various video sequences. It is demonstrated that FACU maximizes the overall number of video streams and optimizes the overall usage of the network without having any adverse effects on the QoS constraints determined.

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Section: Related Workmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

High performing multimedia transmission approach based on QoS support and admission control over IEEE 802.11e networks

Al-Maqri

Mansoor

Sabri

et al. 2020

Int J Communication

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“…This is because, during very low traffic, there is wastage in the channel's bandwidth, and during heavy traffic loads, the network may not be able to provide a QoS guarantee for high-priority traffic. The authors presented the new dynamic TXOP HCCA schedulers in [10][11][12]. These scheduling algorithms work based on a bandwidth-reclaiming scheme that is compatible with the HCCA scheduler.…”

Section: Literature Reviewmentioning

confidence: 99%

“…These are between 32 and 8160 as shown in Eqs. (10) and (11). This facilitates comparison between current aggregate queue size and threshold (min or max) values.…”

Section: Pseudo-code Of the Proposed Dynamic Txop Limit Allocationmentioning

confidence: 99%

Enhancements of the Dynamic TXOP Limit in EDCA Through a High-Speed Wireless Campus Network

Alam

Latif

Akter

et al. 2016

Wireless Pers Commun

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IEEE802.11e is a concrete challenge to providing quality of service (QoS) aimed at interactive multimedia (IMM) applications due to the resource allocation parameter for heterogeneous traffic flows. This parameter is fixed for different specific IMM traffic flows in the IEEE802.11e standard. However, due to the variation in traffic load on wireless campus networks (WCNs), the fixed allocation of the channel resource parameter is not sufficient to guarantee QoS for IMM traffic flows. Thus, many researchers have investigated dynamic regulation of this resource allocation parameter to ensure QoS. However, there are still some unresolved problems with this parameter. This paper introduces an enhanced EDCA resource allocation parameter named dynamic transmission opportunity (TXOP) limit that regulates according to the variation in traffic load over WCN. This work also employs a mathematical modelling approach for the proposed parameter and numerical analysis of the existing and proposed parameters. The evaluation of the proposed model is simulated using Qualnet 5.1. The simulation results show that the proposed scheme allows improving the QoS performance of IMM traffic by reducing endto-end delay. Additionally, the results show that the proposed scheme significantly improves global throughput.

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“…Also dynamically modify, at each polling, the T XOP computation can yet jeopardizes the admission control feasibility test. Instead, a method suitable for providing a dynamic T XOP, without changes in the accorded resources threshold, is a bandwidth reclaiming scheme [6,9,24,28,30].…”

Section: Introductionmentioning

confidence: 99%

Dynamic TXOP HCCA reclaiming scheduler with transmission time estimation for IEEE 802.11e real-time networks

Cecchetti

Ruscelli

Mastropaolo

et al. 2012

Proceedings of the 15th ACM International Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems

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IEEE 802.11e HCCA reference scheduler guarantees Quality of\ud Service only for Constant Bit Rate traffic streams, whereas its as-\ud signment of scheduling parameters (transmission time TXOP and\ud polling period) is too rigid to serve Variable Bit Rate (VBR) traffic.\ud This paper presents a new scheduling algorithm, Dynamic TXOP\ud HCCA (DTH). Its scheduling scheme, integrated with the central-\ud ized scheduler, uses both a statistical estimation of needed trans-\ud mission duration and a bandwidth reclaiming mechanism with the\ud aim of improving the resource management and providing an in-\ud stantaneous dynamic Transmission Opportunity (TXOP), tailored\ud to multimedia applications with variable bit rate. Performance evaluation through simulation, confirmed by the scheduling analysis, shows that DTH is suitable to reduce the transmission queues length.\ud This positively impacts on the delay and on packets drop rate experienced by VBR traffic streams

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Providing variable TXOP for IEEE 802.11e HCCA real-time networks

Cited by 24 publications

References 20 publications

High performing multimedia transmission approach based on QoS support and admission control over IEEE 802.11e networks

High performing multimedia transmission approach based on QoS support and admission control over IEEE 802.11e networks

Enhancements of the Dynamic TXOP Limit in EDCA Through a High-Speed Wireless Campus Network

Dynamic TXOP HCCA reclaiming scheduler with transmission time estimation for IEEE 802.11e real-time networks

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