DOI: 10.21227/at4z-8t52
title: CRAWDAD dataset cambridge/haggle (v. 2009-05-29)

description: network type: bluetoothnetwork type: DTN (Delay Tolerant Network)collection environment:Four iMote-based experiments were conducted. The first included eight researchers and interns working at Intel Research in Cambridge. The second obtained data from twelve doctoral students and faculty comprising a research group at the University of Cambridge Computer Lab. The third experiment was conducted during the IEEE INFOCOM 2005 conference in Miami where 41 iMotes where carried by attendees for 3 to 4 days.In the fourth experiment, we were interested in tracking contacts between different mobile users, and also contacts between mobile users and various fixed locations. Mobile users in our experiment mainly consisted of students from Cambridge University who were asked to carry these iMotes with them at all times for the duration of the experiment. In addition to this, we deployed a number of stationary nodes in various locations that we expected many people to visit such as grocery stores, pubs, market places, and shopping centers in and around the city of Cambridge, UK. A stationary iMote was also placed at the reception of the Computer Lab, in which most of the experiment participants are students.The sixth experiment (Experiment 6) was conducted for 4 days during Infocom 2006 in Barcelona. Mobilie users in the experiment consist of 70 students and researchers, who were attending the student workshop. The 78 mobile iMotes were used, which have a wireless range around 30 meters. In addition, the 20 stationary (long range) iMotes were deployed, which have more powerful battery and extended radio range (around 100 meters). network configurationWe set up experiments making use of the iMote platform made by Intel Research. iMotes are derived from the Berkeley Mote3, with the current version based around the Zeevo TC2001P system-on-a-chip providing an ARM7 processor and Bluetooth support. Along with a 950mAh CR2 battery, each iMote was enclosed in packaging designed to be convenient for test subjects to continually carry. Two types of packaging were made available : some iMotes were made into keyfobs while others were enclosed in small boxes. Subjects were asked to pick the form factor which allowed them to conveniently keep the iMote with them at all times, with most simply attaching the iMote to their keys.data collection methodologyiMotes contacts were classified into two groups: iMotes recording the sightings of another iMotes are classified as "internal" contacts, while sightings of other types of Bluetooth devices are called "external" contacts. The external contacts are numerous and include anyone who has an active Bluetooth device in the vicinity of the iMote carriers, thereby providing a measure of actual wireless networking opportunities present at the time. The internal contacts, on the other hand, represent the data transfer opportunities that each of our participants would have, if they were equipped with devices which are always-on and always-carried.sanitizationAn anonymised version of our data will be made available to other research groups on demand.