Mobile Computing Group

1
Mobile Computing Group
Overview
Members
Activities
http//www.cs.unc.edu/mobile/

• Student Research Fair 2003
• Prof. Maria Papadopouli

2
Fundamental issues on mobile computing

• The effect of Moores Law is transforming a niche
  technology into a ubiquitous one
• Metcalfes Law the value of this networking
  environment will be growing as the square of the
  number of its users
• However
• As transistors shrink, power consumption and heat
  can become potential limiting factors
• The complexity and demand for information and
  power is increasing faster
• Battery capacity grows slowly and power remains a
  very important challenge
• As number of users increases, there are more
  possibilities for single point failures and
  service degradation
• Research on new and efficient communication and
  access paradigms for mobile devices becomes
  important

3
Vision and Research Goal

• Environment that encompasses wireless
  infrastructures and groups of networked devices
  with different capabilities
• New peer-to-peer paradigms can enable devices to
  cooperate, share their resources and exploit the
  characteristics of the environment
• Develop the principles for designing mobile
  peer-to-peer systems and wireless infrastructures
  that improve the performance of the network,
  enhance the information access, and take into
  consideration the energy constraints of the
  devices

4
Main Research Components

• Models of wireless information, user access, and
  mobility pattern in different environments (eg
  campus, institutes, museums)
• Adaptive protocols for mobile peer-to-peer
  systems and wireless infrastructures
• Proactive monitoring discovery of resources (eg
  battery, AP, bandwidth)
• Adapt based on the resources in a self-organizing
  manner
• Energy conservation methods
• Performance analysis of peer-to-peer mobile
  systems and wireless infrastructures
• Interplay of the topological properties of the
  network, wireless range, density of nodes,
  cooperation among nodes, movement pattern, and
  information properties (popularity, cacheability,
  expiration) and their impact on the overall
  performance of the system.

5
Research Projects Overview

• Location-dependent applications
• 7DS, user interactive map editing, note-sharing

• Measurements and analysis of wireless networks

Actual measurements, analysis, and modeling

• Energy-conservation mechanism

Algorithms, protocol design, actual measurements
and simulations

• Location-sensing for mobile users

Protocol design, simulations and actual
measurements

• Security on mobile wireless networks

Protocol design and simulations

• Data diffusion in mobile networks

Theoretical problems
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Course and Meetings

• New course Mobile Computing
• Research and implementation projects
• Experiment with new technology
• Read, present, and discuss research papers
• Weekly Meetings
• Individual group meetings with mobile computing
  group
• with other research groups at UNC (systems,
  netlunch, theory)

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Activities

• Collaboration with institutes and research labs
  world wide
• Very strong ties with IBM, FORTH, NCSU, Duke
• Summer internships at research labs (eg IBM, HP)
• Organizing new conferences on mobile p2p systems
• Active involvement in conferences and workshops
• Awards grants to travel all over the world
  participate in conferences
• eg, Mobihoc in Tokyo, Mobicom in California
  MobiDE, PerComm

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People
Students 20 graduate and 4 undergraduates
students
Measurements Lindsey, Chinchilla, Singh Energy
and security Miller, Vanderknyff Location
sensing Sparks, Fretzagias, Gyllstrom, Levy,
Shiram Theoretical data diffusion Kim,
Seok Applications Shepard, Vogel, Ross, Jomier,
Chek, Fred, Jiang, Grace, Plaisted, Gray,
Ridgill, Wiegand, Fred Professor Dr. Maria
Papadopouli External Visitor Dr. Diane Pozefsky,
IBM Fellow
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Contact Information

• Interested in hiring 2-3 new RAs
• Prof. Maria Papadopouli
• maria_at_cs.unc.edu http//www.cs.unc.edu/ma
  ria
• Office number S356
• Come to talk more Friday 6-8PM and Monday
  12-5pm
• More information about Mobile Computing Group
• http//www.cs.unc.edu/mobile/

10
Information sharing with 7DS
ltapplication nameNote sharing"gt ltpresentation
name"Lecture 1"gt ltstudent nameDaniel"gt
ltslide name"1" localSlidefile
"/lectures/lecture1/slide1.html" lt/slidegt
lt/presentationgt lt/applicationgt
ltapplication nameNews"gt ltmedia
namewww.cnn.com"gt url dateDecember 18
2002, 1223 GMT lt/mediagt lt/applicationgt
ltapplication nameNews"gt ltmedia
namewww.cnn.com"gt urlhttp//www.cnn.com/index.h
tml urlhttp//152.2.45.3/www.cnn.com/index.html
dateDecember 18 2002, 1223 GMT
lt/mediagt lt/applicationgt
cache miss
Host C
WLAN
cache hit
data
Host B
Host A
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Energy Conservation Security Issues

• Cooperative devices communicate
• Denial of service attacks
• Energy conservation protocol
• Rendezvous approach
• Change channel
• Encrypt communication signature
• Measurements of the energy dissipation
• Protocol design
• Simulations prototyping

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Measurement analysis

• Measurements of the wireless infrastructure of
  UNC
• Spatial locality of information
• Mobility pattern of wireless users
• Deployment of location-dependent and peer-to-peer
  applications for mobile users
• Evaluation of their performance
• User interfaces
• Caching impact