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Village Communication Network Leveraging on Fibre to the Village

Village Communication Network Leveraging on Fibre to the Village . Researcher: Vishal Sevani Faculty : Bhaskaran Raman, Abhay Karandikar TCOE IITB Researcher: Jyoti Purohit Faculty: Ashok Jhunjhunwala TCOE IITM. Motivation: Rural Broadband Scenario. Tablet ( Aakaash ). House.

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Village Communication Network Leveraging on Fibre to the Village

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  1. Village Communication Network Leveraging on Fibre to the Village Researcher: VishalSevani Faculty: Bhaskaran Raman, Abhay Karandikar TCOE IITB Researcher: JyotiPurohit Faculty: Ashok Jhunjhunwala TCOE IITM

  2. Motivation: Rural Broadband Scenario Tablet (Aakaash) House Fibre optic access close to village: ~5km Community centre Tablet (Aakaash) Village: 2-3km diameter School Need: cost effective last mile connectivity Applications: rural education, healthcare, IT services

  3. Solution Choices • Running cables • High cost • WiMAX, LTE • High cost • Requirement of tall tower • High power consumption • Wi-Fi based network • License free band • Low equipment cost • Low power consumption: <10W, solar power possible

  4. Long-Distance WiFi versus WiFi Mesh • High cost of tall tower • Hidden terminal issues • Fault tolerance issues “On the Feasibility of the Link Abstraction in (Rural) Mesh Networks”, D. Gokhale, S. Sen, K. Chebrolu, and B. Raman, INFOCOM 2008 Insight: outdoor mesh network links can be stable, TDMA MAC feasible

  5. Solution Choices • Running cables • High cost • WiMAX, LTE • High cost • Requirement of tall tower • High power consumption • Long-distance WiFi • High cost of tower • Wi-Fi based multi-hop mesh network • License free band • Low equipment cost • Low power consumption: <10W, solar power possible • Low cost installation on light poles, roof-tops • Self configurable • Potential to enable “sustainable village franchise” model

  6. Solution Approach: WiFi Mesh (1) Low-cost commodity WiFi hardware (2) WiFi-PHY based link Fibre optic access close to village: ~5km Tablet (Aakaash) House Community centre (3) Multi-hop mesh network running TDMA-based LiT MAC Tablet (Aakaash) Village: 2-3km diameter School

  7. Technical Challenges and Solution • Commodity Wi-Fi has CSMA/CA • Poor performance in multi-hop mesh • Poor throughput, delay: cannot support real-time applications • Solution: TDMA-based MAC called LiTMAC • Light-weight TDMA MAC

  8. Accomplishments • Implementation of TDMA based LiTMACprotocol for WiFi-PHY based mesh network • Modifications to open source ath9k driver • Testing and bug-fixing of LiTMAC implementation • Code runs stably for long durations of time • Implementation of the per-hop ack: performance improvement in presence of wireless packet losses • Ported the software on the low cost Ubiquiti bullet M2HP platform • Testing the solution in lab setting & test deployment

  9. Performance Evaluation Setup LitMACWiFi LitMACWiFi LitMACWiFi Root Ethernet Infra1 Infra2 Infra3 Ethernet Ethernet Ethernet CSMA WiFi CSMA WiFi CSMA WiFi Aakash Tablet Aakash Tablet Aakash Tablet

  10. Performance Results

  11. Future Work • Other features in LiTMACimplementation • Ease of configuration of various LiTMACparameters • Dynamic routing, dynamic scheduling • Identify solar-powersolution for the WiFinodes • Detailed field deployment evaluation of LiTMAC in rural settings • Identify any modifications required in LiTMAC to further improve the efficiency • With LiTMAC code, run pilot commercial network, in co-operation with ISP to provide broadband Internet connectivity

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