A IEEE 802.11e HCCA Scheduler with a Reclaiming Mechanism for Multimedia Applications

Ruscelli, Anna Lina; Cecchetti, Gabriele

doi:10.1155/2014/372693

Cited by 16 publications

(13 citation statements)

References 34 publications

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“…This essentially causes the allocated time to be insufficient to empty the transmission queue of uplink traffics, resulting increased end‐to‐end delay. Some solutions to these problem involves the increased allocation of TXOP duration . These types of solutions, although feasible, result in the degradation of the overall bandwidth utilization when the data rate decreases.…”

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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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%

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%

“…The proposed mechanism allocates the TXOP limit dynamically based on the number of frame sizes and the maximum transmitted physical data rate through the current channel for high priority multimedia traffic over WCNs. The multimedia traffic is considered constant bit rate (CBR) in the proposed scheme because VBR is not able to change traffic load over the network conveniently [12].…”

Section: Proposed Dynamic Txop Limit Schemementioning

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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“…One case is when the application data rate goes up in which the allocated time is not sufficient to empty the transmission queue of the uplink traffics at the QSTAs which in turn results in increasing the end-to-end delay. There are two possible solutions to remedy this problem [5,42]. One is by maximizing the TXOP duration more than that allocated with regards to the average TXOP of the traffic.…”

Section: Transmission Of Mpeg-4 Video In Hccamentioning

confidence: 99%

Adaptive multi-polling scheduler for QoS support of video transmission in IEEE 802.11e WLANs

et al. 2015

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The 802.11E Task Group has been established to enhance Quality of Service (QoS) provision for time-bounded services in the current IEEE 802.11 Medium Access Control (MAC) protocol. The QoS is introduced throughout Hybrid Coordination Function Controlled Channel Access (HCCA) for the rigorous QoS provision. In HCCA, the station is allocated a fixed Transmission Opportunity (TXOP) based on its TSPEC parameters so that it is efficient for Constant Bit Rate streams. However, as the profile of Variable Bit Rate (VBR) traffics is inconstant, they are liable to experience a higher delay especially in bursty traffic case. In this paper, we present a dynamic TXOP assignment algorithm called Adaptive Multi-polling TXOP scheduling algorithm (AMTXOP) for supporting the video traffics transmission over IEEE 802.11e wireless networks. This scheme invests a piggybacked information about the size of the subsequent video frames of the uplink streams to assist the Hybrid Coordinator accurately assign the TXOP according to actual change in the traffic profile. The proposed scheduler is powered by integrating multi-polling scheme to further reduce the delay and polling overhead. Extensive simulation experiments have been carried out to show the efficiency of the AMTXOP over the existing schemes in terms of the packet delay and the channel utilization.

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A IEEE 802.11e HCCA Scheduler with a Reclaiming Mechanism for Multimedia Applications

Cited by 16 publications

References 34 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

Adaptive multi-polling scheduler for QoS support of video transmission in IEEE 802.11e WLANs

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