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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

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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


Tfa wireless business model

TFA-Wireless 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


Questions

Questions?


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