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arXiv 0705.2819cs.NIcs.PF
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IEEE 802.11 DCF的自主分布式接纳控制方案

An Autonomous Distributed Admission Control Scheme for IEEE 802.11 DCF

Preetam Patil, Varsha Apte

摘要:

接纳控制作为一种提供QoS的机制,需要对所请求的流以及已经接纳的流进行准确的描述。由于802.11 WLAN容量在属于所有站的流之间共享,因此准入控制需要了解WLAN中的所有流。此外,通过分析模型估计负载相关的WLAN容量需要关于信道数据率、有效载荷大小和站的数量的输入。这些因素结合起来指向集中式准入控制,而对于802.11 DCF,理想情况下以分布式方式执行。使用来自信道的测量避免了关于上述信道状态的显式输入。BUFFET是本文提出的一种基于模型的测量辅助分布式接纳控制方案,它依赖于测量来获得模型输入并预测WLAN饱和度,从而将平均延迟保持在可接受的范围内。基于测量,它适应数据率和有效载荷大小的组合,使其完全自主和分布式。OPNET仿真结果表明,BUFFET能够在接近最优吞吐量的情况下,保证平均时延小于7ms。

英文摘要:

Admission control as a mechanism for providing QoS requires an accurate description of the requested flow as well as already admitted flows. Since 802.11 WLAN capacity is shared between flows belonging to all stations, admission control requires knowledge of all flows in the WLAN. Further, estimation of the load-dependent WLAN capacity through analytical model requires inputs about channel data rate, payload size and the number of stations. These factors combined point to a centralized admission control whereas for 802.11 DCF it is ideally performed in a distributed manner. The use of measurements from the channel avoids explicit inputs about the state of the channel described above. BUFFET, a model based measurement-assisted distributed admission control scheme for DCF proposed in this paper relies on measurements to derive model inputs and predict WLAN saturation, thereby maintaining average delay within acceptable limits. Being measurement based, it adapts to a combination of data rates and payload sizes, making it completely autonomous and distributed. Performance analysis using OPNET simulations suggests that BUFFET is able to ensure average delay under 7ms at a near-optimal throughput.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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