developing and deploying multi hop wireless networks for a low income communities
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Developing and Deploying Multi-hop Wireless Networks for a Low-Income Communities. Authors: Joseph Camp (Rice U.) Edward Knightly (Rice U.) Will Reed (Technology For All). Outline. Background Technology For All (TFA) Rice Transit Access Points (TAPs) Project Neighborhood Demographics

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developing and deploying multi hop wireless networks for a low income communities

Developing and Deploying Multi-hop Wireless Networks for a Low-Income Communities

Authors: Joseph Camp (Rice U.)

Edward Knightly (Rice U.)

Will Reed (Technology For All)

outline
Outline
  • Background
    • Technology For All (TFA)
    • Rice Transit Access Points (TAPs) Project
    • Neighborhood Demographics
    • Map: Pecan Park
  • Societal Objectives
  • Technical and Economic Objectives
  • Network Architecture
  • Future Work
technology for all tfa
Technology For All (TFA)

MISSION: To empower low-income and under-resourced communities through the tools of technology

  • TFA-Wireless created to deploy a wireless cloud around neighborhood
  • TFA-Wireless using sustainable business model to provide broadband Internet access to local residents and businesses
  • TFA-Wireless – one example of TFA’s social enterprise strategy to achieve its mission
rice taps project
Rice TAPs Project
  • NSF Funded Project (5 years, $7.5M)
  • In Connection with 100x100 Project
  • Real-world motivation
pecan park demographics
Pecan Park Demographics
  • Per-capita Income one-third of national average
  • 36.7 percent of children (under 18) live below poverty line
  • 71 percent of families with children under 5 live below poverty line
  • 64.2 percent of adults (over 25) are without high school diploma or GED
  • 4.2 square kilometers in area
map pecan park
TFA

Melcher Library

Map: Pecan Park

Business

District

outline1
Outline
  • Background
  • Societal Objectives
    • Community Benefits
    • TFA-Wireless Business Model
    • Lessons Learned: Community Outreach
  • Technical and Economic Objectives
  • Network Architecture
  • Future Work
societal objectives
Societal Objectives
  • Affordable Internet access
  • Online education opportunities
  • Work-at-home opportunities
  • Health education and information
  • Economic Development
  • Sustainable Business Model
lessons learned community outreach
Lessons Learned: Community Outreach
  • Early adopters at all socio-economic levels
  • Higher community interest when members of the community involved
  • Low-income community wants a high quality affordable product
  • More community broadband in neighborhood than expected
outline2
Outline
  • Background
  • Technical and Economic Objectives
  • Network Architecture
  • Future Work
economics case for mesh
Economics: Case for Mesh
  • Fiber as high as $200,000 per linear mile
  • DSL and CATV infeasible
  • $1K/month for 1.5 Mbps
  • $5K to $30K/month for 45 Mbps
  • Economies of scale: Affordable IEEE 802.11 Hardware
  • Aggregate all traffic to a single wire
outline3
Outline
  • Background
  • Technical and Economic Objectives
  • Network Architecture
    • Hardware Platform
    • Performance Targets
    • Network Topology
  • Future Work
hardware via mini itx
Hardware: VIA mini-ITX
  • VIA C3 1Ghz
  • SMC 200 mW 802.11b
  • 5 GB Hard Drives
  • 32 MB Flash to run Linux OS
  • LocustWorld Mesh SW
  • 15 dBi Omni-directional Antenna (8 deg. Beam)
performance targets
Performance Targets
  • Four Hop Limitation
    • Inefficiency in forwarding single active flows over multiple hops
    • Unfairness of 802.11 when multiple flows active from multiple hops
  • 1 Mbps Commercial Connection
    • 3 Mbps backbone
network topology
Network Topology
  • Hexagonal Packing
  • 250 meter range
  • Need for Directional Antennae
outline4
Outline
  • Background
  • Technical and Economic Objectives
  • Network Architecture
  • Future Work
    • Extensibility
    • Research Challenges
    • Measurement Study
future extensibility
Future: Extensibility
  • 802.11g Cards
  • Other CTCs and Neighborhoods
  • Increasing Customer Base
  • Maintain Sense of Community Involvement
future research challenges
Future:Research Challenges
  • Off-the-Shelf means fixed Media Access Control (MAC) and Physical (PHY) Layers
  • Rate Limiting on Nodes
  • TCP over wireless
  • Synergizes well with TAPs Project
    • 400 Mbps Multi-Input Multi-Output (MIMO) Physical Layer
    • Custom Hardware using Field-Programmable Gate Arrays (FPGAs)
    • Fairness in Multi-hop Wireless
future measurement study
Future: Measurement Study
  • SNMP and tcpdump for network monitoring
  • Network Planning
    • Link Level Measurements
      • Mesh node to client
      • Mesh node to mesh node
    • Multi-hop Measurements
    • Placement Schemes
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