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Performance Enhancement and bandwidth guarantee in IEEE 802.11 Wireless LANs

Journal of Computer Science & Technology 2004年第2期19卷 150-157页

作者： YongPeng Shi-DuanCheng NationalLaboratoryofSwitchingTechnologyandTelecommunicationNetworks BeijingUniversityofPostsandTelecommunicationsBeijing100876P.R.China

This paper first revisits the previously proposed NSAD (New Self-Adapt DCF) mechanism. Some modifications are presented to further enhance the performance of NSAD in the error-prone environment. Then a new MAC mechanism is proposed that can realize bandwidth guarantee by assigning different self-adapt parameters to users at different priority levels. The bandwidth guarantee property of this new mechanism is analyzed and the high priority users are found to have bandwidth guaranteed even in heavy contention condition, which is proved true not only by theoretical analysis but also by simulation results. At the same time the new scheme keeps the self-adapt character of NSAD, so the overall system utilization is kept very high in heavy contention condition compared with the previously studied DCF-based QoS mechanisms.

关键词： IEEE 802.11 performance enhancement bandwidth guarantee

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Joint Optimization of Admission Control and Rate Adaptation for Video Sharing over Multirate Wireless Community Cloud

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China Communications 2016年第8期13卷 24-40页

作者： Peng Zhao Xinyu Yang Department of Computer Science and Technology Xi'an Jiaotong University

Emerging wireless community cloud enables usergenerated video content to be shared and consumed in a social context. However, the nature of shared wireless medium and timevarying channels seriously limits the quality of service(QoS), partially owing to the lack of mechanisms for effectively utilizing multi-rate channel resources. In this paper, the joint optimization of admission control and rate adaptation is proposed, resulting in a bandwidth-aware rate-adaptive admission control(BRAC) scheme to provide bandwidth guarantee for sharing social multimedia contents. The analytical approach leads to the following major contributions:(1) a bandwidth-aware rate selection(BRS) algorithm to optimally meet the bandwidth requirement of the data session and channel conditions at the physical layer;(2) a routing-coupled rate adaption and admission control algorithm to admit data sessions with bandwidth guarantee. Moreover, extensive numerical simulations suggest that BRAC is efficient and effective in meeting the bandwidth requirements for sharing social multimedia contents. These insights will shed light on communication system implementation for multimedia content sharing over multirate wireless community cloud.

关键词： wireless community cloud multirate rate adaptation bandwidth guarantee admission control

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A Constant Complexity Fair Scheduler with O（log N） Delay guarantee

A Constant Complexity Fair Scheduler with O（log N） Delay G...

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The 19th International Teletraffic Congress-ITC19

作者： Deng Pan and Yuanyuan Yang Deptment of Computer Science State University of New York at Stony Brook Stony Brook NY 11790 Depart of Electrical and Computer Engineering State University of New York at Stony Brook Stony Brook NY 11790

＜正＞Many Internet multimedia applications require the support of network services with fairness and delay guarantees. Currently, there are two types of fair schedulers in the literature. The time stamp based schedulers achieve good fairness and delay guarantees but have high O（log N） time complexity, where N is the number of incoming flows. While the round robin based schedulers reach 0（1） complexity, their delay guarantees are O（N）. Aiming at constant time complexity as well as good fairness and delay guarantees, we design a new fair scheduler suitable for variable length packets in this paper. Past Credit Based （FCB） fair scheduling, the algorithm we propose, provides O（logN） fairness and delay guarantees, by tracking and minimizing the difference between the service a flow reserves and that it actually receives. It reduces the time complexity to O（1） by utilizing approximation and synchronization. To compare FCB with other fair schedulers on their end-to-end delay performance, simulations are conducted in NS2 for various packet lengths, and the results show that FCB achieves short end-to-end delay and handles variable length packets efficiently.

关键词： Fair scheduling shared output link bandwidth guarantee delay guarantee.

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