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SOWER: Self-Organizing Wireless Network for Messaging

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Title: Equilibrium Analysis of Packet Forwarding Strategies in Wireless Ad Hoc Networks the Static Case Author: felegyhazi Last modified by – PowerPoint PPT presentation

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Title: SOWER: Self-Organizing Wireless Network for Messaging


1
SOWER Self-Organizing Wireless Network for
Messaging
Srdjan Capkun
Márk Félegyházi
Jean-Pierre Hubaux
mark.felegyhazi, srdan.capkun,
jean-pierre.hubaux_at_epfl.ch
Laboratory for computer Communications and
Applications, Swiss Federal Institute of
Technology (EPFL) Lausanne, Switzerland
TERMINODES Project (NCCR-MICS) http//www.terminod
es.org
2
SOWER Self-Organizing Wireless Network for
Messaging
  • Intro to ad hoc networks
  • Motivation
  • System approach
  • Connectivity investigations measurement and
    simulations
  • Conclusion and future work

3
Ad Hoc Networks
  • self-organizing network no infrastructure
  • each networking service is provided by the nodes
    themselves
  • devices powered by a battery energy constraints

4
Motivation Cellular Networks
  • Short Messaging (SMS)
  • a simple way of communication ? popular
  • does not require high bandwidth
  • delay tolerant (in the order of tens of seconds /
    minutes)
  • BUT
  • price of SMS is extremely high
  • infrastructure of base stations is complex and
    expensive deployment and maintenance costs
  • users have no alternative
  • Future vision
  • self-organizing and robust short messaging
  • new services / applications

5
A Self-Organizing Wireless Messaging Network
(SOWER)
Each user owns
home device
mobile device
m
  • Home devices are
  • power plugged always on
  • static devices
  • same radio as mobiles

Home devices form a wireless backbone for message
transmission
6
Connectivity measurements (1/2)
Measurement campaign 500m 500m in Lausanne
center
  • Parameters
  • laptops with 801.11b wireless _cards
  • random measurement points
  • 1 Mbit/s channel capacity
  • 100 mW transmission power

7
Connectivity measurements (2/2)
Main observation With the device density equal
to 220 devices/km2, we can provide a messaging
network in a small city with a high coverage.
8
Connectivity and coverage simulation parameters
Investigate the connected component of home
devices
Home devices uniformly placed in the buildings.
9
Connectivity and coverage simulations in 2D
Coverage The proportion of the covered area of
the largest connected component
Connectivity The proportion of the largest
connected component
10
Connectivity simulations in 3D
Skyscrapers
Small buildings 5 floors
11
Penetration requirements
Scenario
modern (Berlin)
ultra-modern (Manhattan)
small (Berkeley)
historic (Rome)
Population density (persons/km2)
25850
2260
8177
12500
Required device density (devices/km2)
700
3000
5000
380
Required market penetration (simulation for
100mW)
0.086
0.24
0.193
0.168
Required market penetration (calculated for 1W,
a5)
0.06
0.04
0.02
0.05
12
Conclusion
  • SOWER All-wireless messaging network in cities
  • self-organizing messaging network
  • city-wide connectivity can be achieved with low
    market penetration
  • capacity is sufficient to support messaging

13
Additional technical issues
  • Deployment of the network
  • using existing infrastructure (dual-mode devices)
  • higher transmission power (1 W in the US)
  • Access to the infrastructure
  • cellular networks
  • high-speed Internet connections
  • Capacity
  • links have higher transmission rate (up to 54
    Mbit/s nowadays)
  • Addressing Routing
  • Security
  • end-to-end security
  • trust issues
  • cooperation
  • Pricing
  • secure micropayment mechanism

14
Future work
  • extensive measurements in different city
    scenarios
  • routing issues include mobile devices in the
    packet forwarding
  • charging and security issues
  • implementation
  • More info
  • web gtgt http//lcawww.epfl.ch/felegyhazi/
  • email gtgt mark.felegyhazi_at_epfl.ch
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