henderson-voice - The Changing Usage of a Mature...

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Unformatted text preview: The Changing Usage of a Mature Campus-wide Wireless Network Tristan Henderson Dept. of Computer Science Dartmouth College Hanover, NH 03755, USA tristan@cs.dartmouth.edu David Kotz Dept. of Computer Science Dartmouth College Hanover, NH 03755, USA dfk@cs.dartmouth.edu Ilya Abyzov Dept. of Computer Science Dartmouth College Hanover, NH 03755, USA ilyab@cs.dartmouth.edu ABSTRACT Wireless Local Area Networks (WLANs) are now commonplace on many academic and corporate campuses. As Wi-Fi technol- ogy becomes ubiquitous, it is increasingly important to understand trends in the usage of these networks. This paper analyzes an extensive network trace from a mature 802.11 WLAN, including more than 550 access points and 7000 users over seventeen weeks. We employ several measurement tech- niques, including syslogs, telephone records, SNMP polling and tcpdump packet sniffing. This is the largest WLAN study to date, and the first to look at a large, mature WLAN and consider geo- graphic mobility. We compare this trace to a trace taken after the networks initial deployment two years ago. We found that the applications used on the WLAN changed dra- matically. Initial WLAN usage was dominated by Web traffic; our new trace shows significant increases in peer-to-peer, streaming multimedia, and voice over IP (VoIP) traffic. On-campus traffic now exceeds off-campus traffic, a reversal of the situation at the WLANs initial deployment. Our study indicates that VoIP has been used little on the wireless network thus far, and most VoIP calls are made on the wired network. Most calls last less than a minute. We saw greater heterogeneity in the types of clients used, with more embedded wireless devices such as PDAs and mobile VoIP clients. We define a new metric for mobility, the session diameter. We use this metric to show that embedded devices have different mobility characteristics than laptops, and travel further and roam to more access points. Overall, users were surprisingly non-mobile, with half remaining close to home about 98% of the time. Categories and Subject Descriptors C.2.1 [ Network Architecture and Design ]: Wireless communica- tion; C.2.3 [ Network Operations ]: Network monitoring General Terms Measurement Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. To copy otherwise, to republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. MobiCom04, Sept. 26-Oct. 1, 2004, Philadelphia, Pennsylvania, USA....
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This note was uploaded on 12/08/2011 for the course CS 525 taught by Professor Gupta during the Spring '08 term at University of Illinois, Urbana Champaign.

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henderson-voice - The Changing Usage of a Mature...

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