Quantitative Study of an Outdoor Multi-Hop 802.11 Network Performance using a Novel Passive Measurement Approach

Ting Zhou, H. Sharif, M. Hempel, P. Mahasukhon, Wei Wang
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引用次数: 1

Abstract

This paper presents a novel passive measurement approach to accurately evaluate the performance of outdoor multi-hop 802.11 networks from the wireless side directly. Our approach employs five processing steps to evaluate per-hop system performances. Firstly, reference packets are identified from multiple independent packet traces. Secondly, multiple packet traces in one channel are merged together using the identified reference packets. Thirdly, redundant packets are filtered from the merging packet traces. To adjust for propagation differences between access points and monitors, the status of each packet is then corrected according to its context packets. Finally, an inference approach based on finite state machines (FSM) is designed to infer missing packets which are not recorded in any of the monitor traces but known to have existed in the real traffic. The unique features in our approach include propagation delay evaluation and FSM designs for existing packet status correction and missing packet inference. The measurement results collected from our outdoor multi-hop 802.11 testbed are used to validate the accuracy of our approach.
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基于新型被动测量方法的室外多跳802.11网络性能定量研究
本文提出了一种新的无源测量方法,可以直接从无线端准确评估室外多跳802.11网络的性能。我们的方法采用五个处理步骤来评估每跳系统的性能。首先,从多个独立的数据包轨迹中识别参考数据包。其次,使用识别的参考包将一个通道中的多个包迹合并在一起。第三,从合并报文轨迹中过滤冗余报文。为了调整接入点和监视器之间的传播差异,然后根据其上下文数据包纠正每个数据包的状态。最后,设计了一种基于有限状态机(FSM)的推理方法来推断未记录在任何监视器跟踪中但已知存在于实际流量中的丢失数据包。该方法的独特之处包括传播延迟评估和FSM设计,用于现有数据包状态校正和缺失数据包推断。从室外多跳802.11测试台上收集的测量结果用于验证我们的方法的准确性。
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