the changing usage of a mature campus-wide wireless network cs525m – mobile and ubiquitous...
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![Page 1: The Changing Usage of a Mature Campus-wide Wireless Network CS525m – Mobile and Ubiquitous Computing Andrew Stone](https://reader035.vdocuments.site/reader035/viewer/2022070411/56649f3b5503460f94c58da7/html5/thumbnails/1.jpg)
The Changing Usage of a Mature Campus-wide Wireless
Network
CS525m – Mobile and Ubiquitous Computing
Andrew Stone
![Page 2: The Changing Usage of a Mature Campus-wide Wireless Network CS525m – Mobile and Ubiquitous Computing Andrew Stone](https://reader035.vdocuments.site/reader035/viewer/2022070411/56649f3b5503460f94c58da7/html5/thumbnails/2.jpg)
Worcester Polytechnic Institute
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Overview
• Project Goal
• Data Collection Methods
• Findings and Data Analysis
• Conclusions and Recommendations
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Worcester Polytechnic Institute
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Project Goal
• Compare WLAN network usage statistics at Dartmouth college from fall 2001 and 2003/2004– Number and type of devices– Applications in use
• Better understand user behavior
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Worcester Polytechnic Institute
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Networked Devices
• Voice over IP– PBX converted to VoIP in 2003– Softphones and VoIP phones
• Client Devices– Laptops, PDAs, phones, etc identified
by using tcpdump traces and an OS fingerprinting tool (p0f)
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Worcester Polytechnic Institute
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Networked Devices
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Worcester Polytechnic Institute
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Data Collection (2001)• Analysis of a Campus-wide Wireless Network (2001)
http://users.wpi.edu/~astone/mobilecomputing/kotzwlananalysis.pdf
• 476 802.11b APs over 161 buildings– 430 were tracked
• 115 Subnets• Syslog tracking started before– Contains authentication, association,
and roaming information
• AP SNMP Polling for Client specific counters–MAC, IP, Signal Strength, traffic info
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Worcester Polytechnic Institute
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Data Collection (2003)
• 566 APs over 188 buildings
• <115 Subnets (started using VLANs)
• >75% of undergrads own laptops
• VOIP phone records
• 18 sniffers covering 121 APs (most popular areas from 2001)
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Worcester Polytechnic Institute
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Data Collection
• 2001 – Over 1700 different wireless cards– 11 week period
• 2003– Over 7000 different wireless cards– 17 week period
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Worcester Polytechnic Institute
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Definitions
• Card, Session, Active card, Active AP, Roam, Roaming Session, Roamer Card, Inbound, Outbound
• Mobile session, Mobile card
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Worcester Polytechnic Institute
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Mobile SessionDistance between any two APs in a
session > ab, bc, cd, da, ac, or bd
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Worcester Polytechnic Institute
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Questions asked
• Has the population grown?
• Have usage patterns changed?
• Where do users visit?
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Worcester Polytechnic Institute
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Has the population grown?
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Worcester Polytechnic Institute
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Active cards per day (2001)
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Worcester Polytechnic Institute
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Active cards per day (2003)
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Worcester Polytechnic Institute
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Active cards per hour (2001)
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Worcester Polytechnic Institute
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Active cards per hour (2003)
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Worcester Polytechnic Institute
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Heavy User Distribution
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Worcester Polytechnic Institute
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Average active days per week per user
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Worcester Polytechnic Institute
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Average active days per week per user
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Worcester Polytechnic Institute
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Active APs per day
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Worcester Polytechnic Institute
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Active APs per day
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Worcester Polytechnic Institute
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Average Active cards per active AP per day
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Worcester Polytechnic Institute
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Average Active cards per active AP per day
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Worcester Polytechnic Institute
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Max cards per hour, for busiest buildings
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Worcester Polytechnic Institute
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Max cards per hour, for busiest buildings
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Worcester Polytechnic Institute
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Daily Traffic (GB)
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Worcester Polytechnic Institute
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Daily Traffic (GB)
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Worcester Polytechnic Institute
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Total traffic
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Worcester Polytechnic Institute
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Total Traffic
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Worcester Polytechnic Institute
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Near/Far Traffic
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Worcester Polytechnic Institute
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Near/Far Traffic
![Page 33: The Changing Usage of a Mature Campus-wide Wireless Network CS525m – Mobile and Ubiquitous Computing Andrew Stone](https://reader035.vdocuments.site/reader035/viewer/2022070411/56649f3b5503460f94c58da7/html5/thumbnails/33.jpg)
Worcester Polytechnic Institute
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Average daily traffic per AP, by AP category
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Worcester Polytechnic Institute
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Average daily traffic per AP, by AP category
![Page 35: The Changing Usage of a Mature Campus-wide Wireless Network CS525m – Mobile and Ubiquitous Computing Andrew Stone](https://reader035.vdocuments.site/reader035/viewer/2022070411/56649f3b5503460f94c58da7/html5/thumbnails/35.jpg)
Worcester Polytechnic Institute
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VoIP calls by hour
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Worcester Polytechnic Institute
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VoIP CCDF of call duration
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Worcester Polytechnic Institute
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P2P Total Traffic
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Worcester Polytechnic Institute
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P2P Near/Far Traffic
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Worcester Polytechnic Institute
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Streaming Media Total Traffic
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Worcester Polytechnic Institute
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Streaming Media Near/Far Traffic
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Worcester Polytechnic Institute
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MobilityTime spent at home location
![Page 42: The Changing Usage of a Mature Campus-wide Wireless Network CS525m – Mobile and Ubiquitous Computing Andrew Stone](https://reader035.vdocuments.site/reader035/viewer/2022070411/56649f3b5503460f94c58da7/html5/thumbnails/42.jpg)
Worcester Polytechnic Institute
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Mobile Session duration
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Worcester Polytechnic Institute
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MobilitySession diameter, distribution across sessions, by application
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Worcester Polytechnic Institute
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Conclusions and Recommendations
• Found dramatic increase in usage and change in applications
• Because the majority of users stay in their home location network caching and prediction-based schemes may be beneficial
• Device profiling: single VLAN campus wide for VoIP and PDA devices and building subnets for laptops
• Compare wireless usage against wired usage
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Worcester Polytechnic Institute
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Future Work
• WLAN moving to 802.11a/b/g
• Campus Cable TV network migrating to IP-based streaming video
• Wireless sniffers
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Worcester Polytechnic Institute
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Thoughts and Questions?