NDLI: Impact of transient CSMA/CA access delays on active bandwidth measurements

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Impact of transient CSMA/CA access delays on active bandwidth measurements

Content Provider	ACM Digital Library
Author	Banchs, Albert Domingo-Pascual, Jordi Cabellos-Aparicio, Albert Mangues-Bafalluy, Josep Portoles-Comeras, Marc
Abstract	WLAN devices based on CSMA/CA access schemes have become a fundamental component of network deployments. In such wireless scenarios, traditional networking applications, tools, and protocols, with their built-in measurement techniques, are usually run unchanged. However, their actual interaction with the dynamics of underlying wireless systems is not yet fully understood. A relevant example of such built-in techniques is bandwidth measurement. When considering WLAN environments, various preliminary studies have shown that the application of results obtained in wired setups is not straightforward. Indeed, the contention for medium sharing among multiple users inherent to CSMA/CA access schemes has remarkable consequences on the behavior of and results obtained by bandwidth measurement techniques. In this paper, we focus on evaluating the effect of CSMA/CA-based contention on active bandwidth measurement techniques. As a result, it presents the rate response curve in steady state of a system with both FIFO and CSMA/CA-based contending cross-traffic. We also find out that the distribution of access delay shows a transient regime before reaching a stationary state. The duration of such transient regime is characterized and bounded. We also show how dispersion-based measurements that use a short number of probing packets are biased measurements of the achievable throughput, the origin of this bias lying on the transient detected in the access delay of probing packets. Overall, the results presented in this paper have several consequences that are expected to influence the design of bandwidth measurement tools as well as to better understand the results obtained with them in CSMA/CA links.
Starting Page	397
Ending Page	409
Page Count	13
File Format	PDF
ISBN	9781605587714
DOI	10.1145/1644893.1644941
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2009-11-04
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Wireless Csma/ca Achievable throughput Bandwidth measurements
Content Type	Text
Resource Type	Article

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