The changing usage of a mature campus-wide wireless network |
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| Affiliation: | 1. School of Computer Science, University of St. Andrews, St. Andrews, Fife KY16 9SX, United Kingdom;2. Department of Computer Science, Dartmouth College, Hanover, NH 03755, United States;1. Lawrence Berkeley National Lab, One Cyclotron Rd., Berkeley, CA 94720, United States;2. Department of Landscape Architecture and Rural Systems Engineering, Seoul National University, South Korea;3. Microsoft Research, Redmond, WA, United States;1. Laboratoire de Radioécologie de Cherbourg-Octeville (LRC), IRSN, 50130 Cherbourg-Octeville, France;2. Université de Caen-Basse Normandie, Laboratoire M2C, UMR CNRS 6143, 14032 Caen, France;3. Université de Rouen, Laboratoire M2C, UMR CNRS 6143, 76821 Mont Saint Aignan Cedex, France;4. Laboratoire de Mesure de la Radioactivité dans l’Environnement (LMRE) IRSN, Orsay, France;1. Laboratory of Mechanics, Modeling and Production (LA2MP), National School of Engineers of Sfax, University of Sfax, BP n° 1173, 3038 Sfax, Tunisia;2. Faculty of Sciences of Sfax, BP n° 1171, 3000 Sfax, Tunisia;1. CSP Services, Paseo de Almería 73, 04001 Almería, Spain;2. CSP Services, Friedrich-Ebert-Ufer 30, 51143 Cologne, Germany;3. DLR German Aerospace Center, Institute of Solar Research, Plataforma Solar de Almeria, 04200 Tabernas, Spain |
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| Abstract: | Wireless Local Area Networks (WLANs) are now commonplace on many academic and corporate campuses. As “Wi-Fi” technology 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 techniques, including syslog messages, telephone records, SNMP polling and tcpdump packet captures. This is the largest WLAN study to date, and the first to look at a mature WLAN. We compare this trace to a trace taken after the network’s initial deployment two years prior.We found that the applications used on the WLAN changed dramatically, with significant increases in peer-to-peer and streaming multimedia traffic. Despite the introduction of a Voice over IP (VoIP) system that includes wireless handsets, 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.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. |
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