UNC/FORTH Archive of Wireless Traces, Models, and Tools

maintained by the UNC and FORTH Mobile Computing Groups


Wireless networking environments can be extremely complex and the interaction of different layers and technologies may create situations that cannot be foreseen during the design and testing stages of technology development. It is therefore critical to perform comprehensive empirical studies in a wide range of production environments to uncover deficiencies and identify possible optimizations and extensions. The availability of high-quality measurement and modeling studies would make it possible to develop wireless networks that are more robust, easier to manage and scale, and able to utilize scarce resources more efficiently. As part of our wireless measurements and modelling research, we have created a data repository.

This data repository is the result of a joint effort of the Mobile Computing Groups in the Department of Computer Science at the University of North Carolina (UNC) and the Institute of Computer Science at the Foundation of Research and Technology - Hellas (FORTH) in Crete, Greece. Both UNC and FORTH have state-of-art testbeds for monitoring large scale wireless networks and collecting extensive wireless traces (e.g. syslog, snmp, TCP flow, and signal strength based data). Such traces enable comparative analysis modelling and validation studies on different wireless networking environments. We make these traces, monitoring tools, and models publicly available to the community.

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Examples of the parameters we modeled, with the proposed models, implemented functions (in matlab) and relevant publications are the following:

 

Parameter

Model

Probability Density Function

Related Papers

Functions

AP Association duration

BiPareto

 

EW' 06

biPareto

Session arrival

Time-varying Poisson with rate λ(t)

N: # of sessions between t1 and t2

WICON '06

 

Client arrival

Time-varying Poisson with rate λ(t)

Same as above

LANMAN '05

 

AP of first association/session

Lognormal

WICON '06

 

Flow interarrival/session

Lognormal

Same as above

WICON '06

 

Flow number/session

BiPareto

WICON '06

 

Flow size

BiPareto

Same as above

WICON '06

 

Client roaming between APs Markov-chain   INFOCOM'04  
Spatio-temporal phenomena in wireless Web access INFOCOM'04  

 

 

Application pattern of wireless users (WOWMOM'07)

 

                                                                                                       

   

Application type

Flows (%)

Bytes (%)

Packets (%)

Clients (%)

NETWORK MANAGEMENT

9.95

0.42

1.54

17

CHAT

2.05

0.48

1.47

73

WEB

35.6

57.59

46.80

99

P2P

30.04

24.85

34.46

43

ON-LINE GAMES

1.11

0.01

0.075

4

FTP

0.91

1.57

1.72

7

MAIL

0.07

0.33

0.21

1.5

ADDRESS SCAN

6.40

0.12

0.58

73

PORTSCAN

0.39

0.32

0.28

1.4

STREAMING

0.10

0.177

0.196

0.5

UNKNOWN

13.2

14.09

12.64

84

   

 


 

Wireless network environments

UNC campus wireless LAN

A brief description of the wireless infrastructure in the UNC campus, with information on the user client population, the number of APs and their type, is given here.

 

FORTH campus wireless LAN

A brief description of the wireless infrastructure in the FORTH buildings, with information on the user client population, the number of APs and their type, is given here.


SYSLOG traces

UNC SYSLOG data

Syslog traces from the UNC campus wireless network are available for several periods spanning the interval September 2004 - June 2005. The format of the available files and more details for their collection and pre-processing are given .More analytically, available are the following datasets:

o        Maria Papadopouli, Haipeng Shen, Manolis Spanakis. Characterizing the duration and association patterns of wireless access in a campus.11th European Wireless Conference 2005, Nicosia, Cyprus, April 10-13, 2005 [PDF, PS, BIBTEX].

o        Maria Papadopouli, Haipeng Shen, Manolis Spanakis. Modeling client arrivals at access points in wireless campus-wide networks. 14th IEEE Workshop on Local and Metropolitan Area Networks, Chania, Crete, Greece, September 18-21, 2005. (ranked fourth best paper in the reviewing process) [PDF, PS, BIBTEX, PPT]. 

 

         Syslog Dataset #2 (13 - 20 April and 2 -  9 May, 2005)

o        M. Papadopouli, M. Moudatsos,  M. Karaliopoulos. Modeling roaming in large-scale wireless networks using real measurements. First workshop on advanced EXPerimental activities ON WIRELESS networks and systems, International Symposium on a World of Wireless, Mobile and Multimedia Networks (WoWMoM06), Niagara-Falls/Buffalo, New York, USA, June 26-29, 2006 [PDF,PS,BIBTEX].


 

SNMP traces

UNC SNMP data

SNMP data collection from the UNC wireless network APs covers the period 2004 - up to now. Details on the pre-processing and formatting of data are given. More analytically, the available SNMP datasets are:

FORTH SNMP data

Measurement data from SNMP pollings of the FORTH wireless infrastructure have been collected since September 2005.


Packet header traces

UNC data

Flow-level data from the UNC wireless network are available for the week 13 - 20 April, 2005. The details are provided here.

 


HTTP Request Logs

HTTP requests from the UNC wireless network as a result of TCP packets processing. Available for 6 - 28 February, 2003. The details are provided here.

Signal strength traces

FORTH data

Signal strength values have been acquired from several access points at various positions in FORTH using NetStumbler. More details and the dataset are provided here.


Synthetic traces

Synthetic traces have been produced using the derived models for session arrivals, flow sizes, in-session flow interarrivals, and in-session number of flows. More details and the corresponding datasets are provided here.


Related Events

o        Mobility in Wireless Networks - challenges and opportunities, NSF workshop - Rutgers, July 31-Aug 1, 2007

o        3rd International Workshop on Wireless Network Measurement. [WinMee/WiTMeMo'07]

o        2nd International workshop on Wireless Traffic Measurements and Modeling, 5 August 2006, Boston, MA. [WiTMeMo'06]

o        The 2nd Annual International Wireless Internet Conference, 2-5 August 2006, Boston, MA. [Wicon'06]

o        1st International workshop on Wireless Traffic Measurements and Modeling, 5-8 June 2005, Seattle, WA. [WiTMemo'05]


Other Wireless Data Repositories


Funding

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