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首页> 外文会议>International Workshop on Quality of Service in Multiservice IP Networks(QoS-IP 2005); 20050202-04; Catania(IT) >Performance Evaluation of a Feedback Based Dynamic Scheduler for 802.11e MAC
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Performance Evaluation of a Feedback Based Dynamic Scheduler for 802.11e MAC

机译：基于反馈的802.11e MAC动态调度程序的性能评估

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摘要

IEEE 802.11 Wireless Local Area Networks (WLANs) are a fundamental tool for enabling ubiquitous wireless networking. Their use has been essentially focused on best effort data transfer because the basic access methods defined in the 802.11 standard cannot provide delay guarantees to real-time flows. To overcome this limitation, the 802.11e working group has recently proposed the Hybrid Coordination Function (HCF), which is an enhanced access method that allows service differentiation within WLAN's. While the 802.11e proposal gives a flexible framework to address the issue of service differentiation in WLAN's, it does not specifies effective algorithms to really achieve it. This paper compares the performance of standard access methods proposed by the 802.11e working group with a novel Feedback Based Dynamic Scheduler (FBDS), which is compliant to 802.11e specifications. Simulation results, obtained using the ns-2 simulator, have shown that FBDS guarantees bounded delays to real-time flows for a very broad set of network loads and packet loss probabilities, whereas, analogous algorithms proposed by the 802.11e working group fail in presence of high network load.
机译：IEEE 802.11无线局域网（WLAN）是用于实现无所不在的无线联网的基本工具。它们的使用基本上集中在尽力而为的数据传输上，因为802.11标准中定义的基本访问方法无法为实时流提供延迟保证。为了克服此限制，802.11e工作组最近提出了混合协调功能（HCF），这是一种增强的访问方法，可以在WLAN中区分服务。尽管802.11e提议提供了一个灵活的框架来解决WLAN中的服务差异问题，但它并未指定有效的算法来真正实现这一点。本文将802.11e工作组提出的标准访问方法的性能与符合802.11e规范的新型基于反馈的动态调度程序（FBDS）进行了比较。使用ns-2仿真器获得的仿真结果表明，对于大量的网络负载和丢包率，FBDS保证了实时流的有限延迟，而802.11e工作组提出的类似算法在存在时会失败高网络负载。

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