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 ID: 144136
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Slide1
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 IITMSlide2
Motivation: Rural Broadband Scenario
House
Community
centre
School
Village: 2-3km diameter
Tablet (
Aakaash
)
Tablet (
Aakaash
)
Fibre
optic access close to village: ~5km
Need:
cost effective last mile connectivity
Applications:
rural education, healthcare, IT servicesSlide3
Solution Choices
Running cables
High cost
WiMAX, LTEHigh costRequirement of tall tower
High power consumptionWi-Fi based networkLicense free band
Low equipment costLow power consumption: <10W, solar power possibleSlide4
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 feasibleSlide5
Solution Choices
Running cables
High cost
WiMAX, LTEHigh costRequirement of tall tower
High power consumptionLong-distance WiFiHigh cost of tower
Wi-Fi based multi-hop mesh networkLicense free bandLow equipment costLow power consumption: <10W, solar power possibleLow cost installation on light poles,
roof-topsSelf configurablePotential to enable “sustainable village franchise” modelSlide6
Solution Approach: WiFi Mesh
House
Community
centre
School
Village: 2-3km diameter
Tablet (
Aakaash
)
Tablet (
Aakaash
)
Fibre
optic access close to village: ~5km
(2)
WiFi
-PHY based link
(1) Low-cost commodity
WiFi
hardware
(3) Multi-hop mesh network running TDMA-based
LiT
MACSlide7
Technical Challenges and SolutionCommodity Wi-Fi has
CSMA/CA
Poor
performance in multi-hop meshPoor throughput, delay: cannot support real-time applicationsSolution: TDMA-based MAC called
LiTMACLight-weight TDMA MACSlide8
Accomplishments
Implementation of TDMA based
LiTMAC
protocol for WiFi-PHY based mesh network
Modifications to open source ath9k driverTesting and bug-fixing of LiTMAC implementationCode
runs stably for long durations of timeImplementation of the per-hop ack: performance improvement in presence of wireless packet losses
Ported the software on the low cost Ubiquiti bullet M2HP platformTesting the solution in lab setting & test deploymentSlide9
Performance Evaluation Setup
Root
Infra1
Infra3
Infra2
LitMAC
WiFi
LitMAC
WiFi
LitMAC
WiFi
CSMA
WiFi
CSMA
WiFi
CSMA
WiFi
Aakash Tablet
Aakash Tablet
Aakash Tablet
Ethernet
Ethernet
Ethernet
EthernetSlide10
Performance Results
Aakash
1
Aakash
2
Aakash 3TCP throughput
3.72 Mbits/s
3.54 Mbits
/s
3.49 Mbits/s
UDP throughput, jitter, packet loss
4.15
Mbits/s,
3.812ms,0%
4.09 Mbits/s
3.653ms,
0.047%
4.10 Mbits/s, 3.549ms,0%Slide11
Future Work
Other
features in
LiTMAC implementationEase of configuration of various
LiTMAC parametersDynamic routing, dynamic schedulingIdentify solar-power
solution for the WiFi nodesDetailed field deployment evaluation of LiTMAC in rural settingsIdentify
any modifications required in LiTMAC to further improve the efficiencyWith LiTMAC code, run pilot commercial network, in co-operation with ISP to provide broadband Internet connectivity