The Changing Usage of a Mature Campus-wide Wireless Network Export

@inproceedings{henderson:voice, 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 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 geographic mobility. We compare this trace to a trace taken after the network's initial deployment two years ago. \\ We found that the applications used on the WLAN changed dramatically. 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 WLAN's 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.}, address = {Philadelphia, PA, USA}, author = {Henderson, Tristan and Kotz, David and Abyzov, Ilya}, booktitle = {Proceedings of the Tenth Annual International Conference on Mobile Computing and Networking (MobiCom)}, citeulike-article-id = {2051945}, citeulike-linkout-0 = {http://portal.acm.org/citation.cfm?id=1023739}, citeulike-linkout-1 = {http://dx.doi.org/10.1145/1023720.1023739}, citeulike-linkout-2 = {http://www.cs.dartmouth.edu/~dfk/papers/henderson:voice.pdf}, citeulike-linkout-3 = {http://www.cs.st-andrews.ac.uk/~tristan/pubs/mobicom04.pdf}, doi = {10.1145/1023720.1023739}, isbn = {1-58113-868-7}, keywords = {crawdad, dartmouth\_campus, measurement, network-measurement, wifi, wireless}, location = {Philadelphia, PA, USA}, month = {September}, pages = {187--201}, posted-at = {2008-07-24 09:20:05}, priority = {2}, publisher = {ACM Press}, title = {The Changing Usage of a Mature Campus-wide Wireless Network}, url = {http://dx.doi.org/10.1145/1023720.1023739}, year = {2004} }

TY - CONF ID - henderson:voice L3 - citeulike-article-id:2051945 N2 - 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 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 geographic mobility. We compare this trace to a trace taken after the network's initial deployment two years ago. \\ We found that the applications used on the WLAN changed dramatically. 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 WLAN's 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. CY - Philadelphia, PA, USA SN - 1-58113-868-7 AD - Philadelphia, PA, USA EP - 201 TI - The Changing Usage of a Mature Campus-wide Wireless Network PB - ACM Press T2 - Proceedings of the Tenth Annual International Conference on Mobile Computing and Networking (MobiCom) SP - 187 KW - crawdad KW - dartmouth_campus KW - measurement KW - network-measurement KW - wifi KW - wireless AU - Henderson, Tristan AU - Kotz, David AU - Abyzov, Ilya PY - 2004/September// UR - http://dx.doi.org/10.1145/1023720.1023739 ER -