An Efficient Bandwidth Reclaim Scheme for the Integrated Transmission of Real-Time and Non-Real-Time Messages on the WLAN

Lee, Junghoon; Shin, In-Hye; Park, Gyung-Leen; Song, Wang‐Cheol; Kim, Jinhwan; Kim, Pankoo; Hong, Jiman

doi:10.1007/978-3-540-72590-9_140

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…In Lee et al (2007) a bandwidth reclaiming scheme for the IEEE 802.11 PCF function with weighted round robin (WRR) scheduling policy is proposed. It determines when the unused transmission time can be either used to advance the next polling opportunity or assigned to the contention period.…”

Section: Hcca Scheduling Algorithmsmentioning

confidence: 99%

Improving the QoS of IEEE 802.11e networks through imprecise computation

Ruscelli¹,

Cecchetti²

2016

IJAHUC

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IEEE 802.11e HCCA reference scheduler is based on fixed value parameters that do not adapt to traffic changes, thus quality of service (QoS) for multimedia applications is a challenge, especially in the case of variable bit rate (VBR) streams, that requires dynamic resource assignment. This paper is focused on immediate dynamic TXOP HCCA (IDTH) scheduling algorithm and its new evolution immediate dynamic TXOP HCCA plus (IDTH+). Their reclaiming mechanisms, refined by the monitoring of transmission duration, aim at overcoming the limits of fixed preallocation of resources by varying the stations transmission time and avoiding waste of resources. Simulations and theoretical analysis based on the imprecise computation model show that the integration of IDTH and IDTH+ can achieve improved network performance in terms of transmission queues length, mean access delay and packets drop rate, and to efficiently manage bursty traffic. Moreover, the performance improvements of IDTH+ with respect to IDTH are highlighted.

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Section: Hcca Scheduling Algorithmsmentioning

confidence: 99%

Improving the QoS of IEEE 802.11e networks through imprecise computation

Ruscelli¹,

Cecchetti²

2016

IJAHUC

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“…As example of first reclaiming mechanisms, in [21] a bandwidth reclaiming scheme for the PCF function with Weighted Round Robin (WRR) scheduling policy is proposed. It determines when the unused transmission time can be either used to advance the next polling opportunity or assigned to the Contention Period.…”

Section: Hcca Scheduling Algorithmsmentioning

confidence: 99%

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

Ruscelli

Cecchetti

2014

Advances in Multimedia

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The QoS offered by the IEEE 802.11e reference scheduler is satisfactory in the case of Constant Bit Rate traffic streams, but not yet in the case of Variable Bit Rate traffic streams, whose variations stress its scheduling behavior. Despite the numerous proposed alternative schedulers with QoS, multimedia applications are looking for refined methods suitable to ensure service differentiation and dynamic update of protocol parameters. In this paper a scheduling algorithm,Unused Time Shifting Scheduler(UTSS), is deeply analyzed. It is designed to cooperate with a HCCA centralized real-time scheduler through the integration of a bandwidth reclaiming scheme, suitable to recover nonexhausted transmission time and assign that to the next polled stations. UTSS dynamically computes with anO(1)complexity transmission time providing an instantaneous resource overprovisioning. The theoretical analysis and the simulation results highlight that this injection of resources does not affect the admission control nor the centralized scheduler but is suitable to improve the performance of the centralized scheduler in terms of mean access delay, transmission queues length, bursts of traffic management, and packets drop rate. These positive effects are more relevant for highly variable bit rate traffic.

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“…In [25] the authors propose a bandwidth reclaiming scheme for the IEEE 802.11 PCF function with Weighted Round Robin (WRR) scheduling policy. It determines when the unused transmission time can be either used to advance the next polling opportunity or assigned to the Contention Period.…”

Section: Hcca Scheduling Algorithmsmentioning

confidence: 99%

A greedy reclaiming scheduler for IEEE 802.11e HCCA real-time networks

Ruscelli

Cecchetti

Mastropaolo

et al. 2011

Proceedings of the 14th ACM International Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems

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The IEEE 802.11e standard introduces Quality of Service (QoS) support for wireless local area networks and suggests how to design a tailored HCF Controlled Channel Access (HCCA) scheduler. However the reference scheduling algorithm is suitable to assure service guarantees only for Constant Bit Rate traffic streams, whereas shows its limits for Variable Bit Rate traffic. Despite the numerous alternative schedulers proposed to improve the QoS support for multimedia applications, in the case of VBR traffic satisfactory real-time performance has not been yet achieved.This paper presents a new scheduling algorithm, Unused Time Shifting Scheduler (UTSS). It integrates a mechanism for bandwidth reclaiming into a HCCA real-time scheduler. UTSS assigns the unused portion of each transmission opportunity to the next scheduled traffic stream. Thanks to such feature, traffic variability is absorbed, reducing the waste of resources. The analytical evaluation, corroborated by the simulation results, shows that UTSS is suitable to reduce the delay experienced by VBR traffic streams and to increase the maximum burstiness sustainable by the network.

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An Efficient Bandwidth Reclaim Scheme for the Integrated Transmission of Real-Time and Non-Real-Time Messages on the WLAN

Cited by 4 publications

References 7 publications

Improving the QoS of IEEE 802.11e networks through imprecise computation

Improving the QoS of IEEE 802.11e networks through imprecise computation

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

A greedy reclaiming scheduler for IEEE 802.11e HCCA real-time networks

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