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MESH NETWORKING

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SYMPOSIUM ON DIGITAL FABRICATION PRETORIA. Characteristics of the mesh networks ... SYMPOSIUM ON DIGITAL FABRICATION PRETORIA 'Africa Calling' a highway to follow ... – PowerPoint PPT presentation

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Title: MESH NETWORKING


1
MESH NETWORKING
  • LABORATORY OF TELECOMMUNICATIONS
  • George Sergiadis
  • Associate Professor
  • sergiadi_at_auth.gr

2
Characteristics of the mesh networks
  • Wireless by definition, infrastructure
    independent
  • Formed in a spontaneous way, few to plan
  • New nodes become routers to expand the network,
    scalable system
  • Not only for internet access

3
THE FAB LAB SCOPE
4
A TYPICAL urban MESH
  • Source Microsoft Research

5
The announced Urban Mesh
A Spanish firm is to sell subsidized routers as
part of a plan to turn domestic wi-fi networks
into public hotspots. Fon will sell wi-fi
routers, which allow people to surf the net
wirelessly, for 5 The company, which has
financial backing from Google and Skype, aims to
create public wi-fi networks street by street
across the US and Europe.
Tuesday, 27 June 2006
6
Africa Calling a highway to follow
The number of mobile subscribers in 30
sub-Saharan African countries, not including
South Africa, rose from zero in 1994 to more than
82 million in late 2004
7
Rural mesh model - main components
  • Hardware
  • Routers
  • Antennas, cables
  • Power supplies - Solar
  • Structural solutions
  • Software
  • Networking and dynamic multihop routing
  • QOS control
  • Management
  • Security and privacy

8
Routers
  • Many vendors
  • Many low cost solutions from 25 to 60 US , but
  • Most of them are not suitable for efficient rural
    meshes with few gateway points

9
Mesh network Protocols
  • Dynamic rerouting
  • Efficient package management
  • Additional services

10
Antennas
Price 349.90
11
Fab Lab mesh network approach
12
Routers on trial
  • Roofnet, an unplanned, multiroute mesh network
    developed at MIT's Computer Science and
    Artificial Intelligence Laboratory

13
Fab Lab WiFi Antenna Projects
  • Target
  • Very low cost, 1 or 2 US
  • Low manufacturing sensitivity
  • Fab Lab easily reproducible, by unskilled
    Fablabers, using the Fab Lab tools

14
Fab Lab WiFi Antenna Projects
  • Glass Antennas
  • Quasi-isotropic antennas, mostly for interior use
  • Arrays for higher gain, for internal or low
    distance external use
  • Corner reflector antennas for point to point
    longer distance links

15
Glass Antenna Ingredients
  • Window Glass
  • Self adhesive cooper
  • CAD file
  • Flexible low-loss cable, or no cable

16
Isotropic Antennas
Gain 3 dbi
17
Higher gain Arrays
Directivity 1200 H / 300 V- Gain 9 dbi
18
Corner reflector antennas
Directivity 600 H / 300 V - Gain 12 dbi
19
Very high gain systems New approaches
  • Planar structure
  • Gain gt20 dbi
  • Low cost glass dielectric
  • Higher frequencies ( 5 GHz)

20
Very high gain systems New approaches
Planar structure - Gain gt20 dbi
21
Potential contribution of the mesh networks,
especially in developing countries
  • In business prosperity
  • In employment
  • In information spread
  • In medical services
  • In distance learning
  • In natural disaster management
  • Even in politics and democracy protection

22
Conclusions
  • Fab Lab reduces dramatically the cost of the mesh
    networking by producing the most expensive
    components, instead of buying them
  • Fab Lab plans to design and manufacture also
    other expensive parts of the supporting
    infrastructure, by implementing its collective
    know-how

23
Thank you for your attention
  • LABORATORY OF TELECOMMUNICATIONS
  • George Sergiadis
  • Associate Professor
  • sergiadi_at_auth.gr
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