Metrics for detection of QoS degradation over wireless LAN
Matsukawa, T.; Satake, T.; Yamada, J.
Applications and the Internet, 2005. Proceedings. The 2005 Symposium on
Volume , Issue , 31 Jan.-4 Feb. 2005 Page(s): 198 - 203
Digital Object Identifier   10.1109/SAINT.2005.40
Summary: IEEE802.11 wireless LAN systems are being widely used and multiple wireless LAN coexistence systems like 802.11b/g are available at the same time. However, in such environments, network performance is likely to degrade because the CAMA/CA mechanism does not always work well. Especially in the 802.11b/g systems, issues on performance degradation caused by the CTS-protection mechanism come to surface. To manage and maintain the QoS in such environments, it is required to detect and estimate the QoS degradation effectively. We found that the so-called retry ratio (i.e., the retry ratio of the numbers of transmitted packets to retransmitted ones) is strongly correlated with IP-packet quality metrics through our IP packet experiments. It is thus considered that retry ratio is applicable to managing the quality of some applications over wireless LAN.

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