CRAWDAD dartmouth/campus (v. 2004-08-05)

Citation Author(s):
David
Kotz
Dartmouth College
Tristan
Henderson
University of St Andrews
Ilya
Abyzov
Dartmouth College
Jihwang
Yeo
Dartmouth College
Submitted by:
CRAWDAD Team
Last updated:
Wed, 01/31/2007 - 08:00
DOI:
10.15783/C7201N
Data Format:
.tgz
License:
Creative Commons Attribution
181 Views
Collection:
CRAWDAD
Categories:
Wireless Networking
Keywords:
Communication
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Abstract 

Measurement trace from wireless network at Dartmouth College.

This dataset includes measurement trace for over 450 access points and several thousand users at Dartmouth College.

Dataset note: This dataset has multiple versions. The dataset file name(s) of the data associated with this version are listed below, under the 'Traceset' heading and can be downloaded under 'Dataset Files' on the right-hand side of the page.

The data associated with this version is: movement.tgz (from the dartmouth/campus/movement/infocom04 trace) size~"51 MB"

last modified :

2006-11-14

release date :

2004-08-05

date/time of measurement start :

2001-04-11

date/time of measurement end :

2004-06-30

collection environment :

The Dartmouth College campus has over 190 buildings on 200 acres. 
Dartmouth College has about 5500 students and 1200 faculty, and during our study 
there were approximately 3200-3300 undergraduates on campus. Students are required 
to own a computer, and most purchase a computer through the campus computer store. 
Wireless laptops increasingly dominate those purchases, making up 45% of the total 
in 2000, 70% in 2001, 88% in 2002, and 97% in 2003. Assuming that students obtaining 
computers elsewhere choose laptops in the same proportion, we estimate that over 75%
of the undergraduates owned laptops at the time of our study.

network configuration :

476 Cisco 802.11b access points (APs) were installed in 2001 to cover most of 
the campus. Since then, APs have been added to increase coverage and to cover 
new construction, and there are currently 566 APs. The compact nature of the campus 
means that the signal range of interior APs extends to cover most of the campus' 
outdoor areas. All APs share the same SSID, allowing wireless clients to roam seamlessly 
between APs. On the other hand, a building's APs are connected to the building's 
existing subnet. The 188 buildings with wireless coverage span 115 subnets, 
so clients roaming between buildings may be forced to obtain new IP addresses.
Clients obtain IP addresses using DHCP (lease times were
6 or 12 hours at different points in the trace).

data collection methodology :

We used three techniques: syslog events, SNMP polls, and network sniffers (tcpdump). 
We also derived movement history data from the systlog data.

sanitization :

All data has been sanitized to protect the privacy of our users. We have resanitized the data (2004-11-08) so that there is a consistent MAC/IP address mapping and a consistent IP address mapping across all of the traces. In other words, the sanitized IP address 111.222.333.444 will correspond to the same raw IP address in all of our traces. 
Similarly, the sanitized MAC address aa:bb:cc:dd:ee:ff will always correspond to the same raw MAC address in all of our traces. Note that these may not represent the same physical device, due to DHCP, MAC spoofing, etc.

Traceset

dartmouth/campus/movement

Two-year records showing the location (AP association) of each wireless card seen on campus.

  • files: movement.tgz
  • description: Over three years of nearly continuous records showing the location (access-point association) of each wireless card seen on campus. We used this data for our study of location predictors, published in [INFOCOM'04 paper] and a subsequent, expanded [technical report]. This data is derived from the syslog data. The trace used for this paper is gzipped tar file [51MB].
  • measurement purpose: User Mobility Characterization
  • methodology: We extracted user traces from dartmouth/campus/syslog. Each user's trace is a series of locations, that is, access-point names. We introduced the special location 'OFF' to represent the user's departure from the network (which occurs when the user turns off their computer or their wireless card, or moves out of range of all access points). The traces varied widely in length (the number of locations in the sequence). Users with longer traces were either more active (using their card more), more mobile (thus changing access points more often), or used the network for a longer period (some users have been on the network since April 2001, and some others have only recently arrived on campus).
  • sanitization: same as dartmouth/campus/syslog
  • last modified: 2006-11-14
  • dataname: dartmouth/campus/movement
  • version: 20040805
  • change: Infocom 2004 trace is added.
  • release date: 2004-08-05
  • limitation: same as dartmouth/campus/syslog
  • hole: same as dartmouth/campus/syslog

dartmouth/campus/movement Traces

    • infocom04: Two-year records showing the location (AP association) of each wireless card seen on campus.
  • configuration: This trace is derived from the trace dartmouth/campus/syslog/01_04.
  • format: timestamp, associated AP
  • description: Over two years of nearly continuous records showing the location (access-point association) of each wireless card seen on campus. We used this data for our study of location predictors, published in [INFOCOM'04 paper] and a subsequent, expanded [technical report]. This data is derived from the syslog data. The trace used for this paper is gzipped tar file [51MB]. .
  • last modified: 2006-11-14
  • dataname: dartmouth/campus/movement/infocom04
  • version: 20040805
  • change: Infocom04 movement trace is newly created
  • release date: 2004-08-05
  • file: movement.tgz
Instructions: 

The files in this directory are a CRAWDAD dataset hosted by IEEE DataPort. 

About CRAWDAD: the Community Resource for Archiving Wireless Data At Dartmouth is a data resource for the research community interested in wireless networks and mobile computing. 

CRAWDAD was founded at Dartmouth College in 2004, led by Tristan Henderson, David Kotz, and Chris McDonald. CRAWDAD datasets are hosted by IEEE DataPort as of November 2022. 

Note: Please use the Data in an ethical and responsible way with the aim of doing no harm to any person or entity for the benefit of society at large. Please respect the privacy of any human subjects whose wireless-network activity is captured by the Data and comply with all applicable laws, including without limitation such applicable laws pertaining to the protection of personal information, security of data, and data breaches. Please do not apply, adapt or develop algorithms for the extraction of the true identity of users and other information of a personal nature, which might constitute personally identifiable information or protected health information under any such applicable laws. Do not publish or otherwise disclose to any other person or entity any information that constitutes personally identifiable information or protected health information under any such applicable laws derived from the Data through manual or automated techniques. 

Please acknowledge the source of the Data in any publications or presentations reporting use of this Data. 

Citation:

David Kotz, Tristan Henderson, Ilya Abyzov, Jihwang Yeo, CRAWDAD dataset dartmouth/campus (v. 2004‑08‑05),  https://doi.org/10.15783/C7201N, Aug 2004.

Dataset Files

Documentation

AttachmentSize
File dartmouth-campus-20040805-readme.txt1.65 KB

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These datasets are part of Community Resource for Archiving Wireless Data (CRAWDAD). CRAWDAD began in 2004 at Dartmouth College as a place to share wireless network data with the research community. Its purpose was to enable access to data from real networks and real mobile users at a time when collecting such data was challenging and expensive. The archive has continued to grow since its inception, and starting in summer 2022 is being housed on IEEE DataPort.

Questions about CRAWDAD? See our CRAWDAD FAQ. Interested in submitting your dataset to the CRAWDAD collection? Get started, by submitting an Open Access Dataset.

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