Note: This metadata was prepared by the CRAWDAD team and verified by the data set (or tool) authors. We have made every effort to ensure its accuracy, but urge all users to consider the metadata and data carefully and be sure that their use in research is consistent with the nature and limitations of the data. We welcome any corrections.
This metadata was prepared based on the following reference(s):
|
version
| v. 2008-12-01 |
|
changes
| the initial version |
|
bibtex
|
@MISC{unimi-pmtr-2008-12-01,
author = {Paolo Meroni and Sabrina Gaito and Elena Pagani and Gian Paolo Rossi},
title = {{CRAWDAD} data set unimi/pmtr (v. 2008-12-01)},
howpublished = {Downloaded from http://crawdad.cs.dartmouth.edu/unimi/pmtr},
month = dec,
year = 2008
}
|
| metadata last modified | 2010-09-10 |
| summary | This dataset contains mobility traces from 44 mobile devices at University of
Milano. The data was collected in November 2008. |
| release date | 2008-12-01 |
| measurement start | 2008-11-13 |
| measurement end | 2008-12-01 |
| authors | Paolo Meroni
Sabrina Gaito
Elena Pagani
Gian Paolo Rossi
|
|
web site
| http://www.crawdad.org/unimi/pmtr |
|
wiki
|
go to the wiki page for this data set
|
| keyword | location, sensor network, social network |
| measurement purposes | User Mobility Characterization
Positioning Systems
Social Network Analysis
Human Behavior Modeling
Localization
Opportunistic Connectivity
|
| network type | social network |
| network type | DTN (Delay or Disruption Tolerant Network) |
| environment | The experiment lasted for 19 days in November 2008. 49 Pocket Mobile Trace
Recorders (PMTRs) were distributed to faculty members, PhD students, and
technical staff. These people work in offices and laboratories located in a
three-floor building, roughly 200x100 m large and take lunches or coffee breaks
in a nearby cafeteria. Some of the classes take place in a different building
3.5 Km away. These locations were equipped with fixed PMTRs. |
| network | The need to observe and record very short contact periods that arise from human
mobility motivated the design of a specific custom hardware device for trace
recording. Pocket Mobile Trace Recorders (PMTRs) have been designed to operate
with beaconing times ranging from 1 sec. to some configurable value, which
depends on the mobility environment we wish to observe. The PMTR architecture
uses the Cypress CY8C29566 micro-controller and the radio module AUREL, model
RTX-RTLP. The radio range has been limited to 10 meters in order to reduce the
power consumption and to maintain multi-hop paths between end-systems. This
combination allows a very low power consumption that lets the experiments last
for the required time with common batteries NiMh, AA 1.2 V. Each PMTR has a
1 MB flash memory where more than 50K contacts can be stored. The PMTR
implements a CSMA non-persistent MAC protocol. The local clock value is set at
the configuration time. Each PMTR uses a USB interface to communicate with the
Pocket Viewer PC, running the Desktop application software, which has been used
to configure the devices, collect the recorded data at the end of the
experiment, and support data analysis and device monitoring. |
| collection | Recorded data was collected at the end of the experiment. Symmetric contacts,
that is contacts recorded by both devices approximately at the same time,
were kept for analysis; unidirectional contact records were discarded. This
resulted in a collection of 11895 contacts between 44 PMTRs. |
| limitation | |
| hole | At the end of the experiment, 5 PMTRs (with IDs 5, 8, 15, 30 and 35) had not
registered any contacts due to hardware failure.
Only symmetric contact records from other PMTRs were kept. One-sided contact
records were discarded. |
| error | |
| note | |
|
tracesets included
| unimi/pmtr/txt (v. 2008-12-01)
|
|
category
| inproceedings |
| authors | Sabrina Gaito
Elena Pagani
Gian Paolo Rossi
|
| title | Opportunistic Forwarding in Workplaces |
| booktitle | Proceedings of 2nd ACM SIGCOMM Workshop on Online Social Networks |
| pages | 55-60 |
| year | 2009 |
| address | Barcelona, Spain |
| month | --08-- |
| publisher | ACM |
| download url | http://homes.dico.unimi.it/~pagae/elena/articoli/WOSN_09.pdf |
| abstract | So far, the search for Opportunistic Network (ON) applications has focused on
urban/rural scenarios where the combined use of mobility and the
store-carry-and-forward paradigm helpfully recovers from network partitions and
copes with node sparsity. This paper explores the chance of using ONs in
workplaces, where the node distribution is denser, thus contributing to reduce
the message delivery latency, and where we still find similar needs for
informal and unplanned network platforms to support human social relationships
and interactions. Both a survey and trace recording experiments have been used
to support the analysis of this mobility setting. The ability of recording very
short contact times (i.e. lasting few seconds) allowed to interestingly show
the slightly different role the social relationships play in dense scenarios
and how the large amount of contacts (both short and long), occurring in
densily populated spaces, actually contribute to reduce the message-delivery
latency and to increase the delivery probability. |
| keywords | measurement |
| keywords | wireless |
| keywords | unimi_pmtr |
| keywords | crawdad |
| related data/tools | unimi/pmtr
|
