david goodman wireless internet center for advanced technology (wicat) polytechnic university
DESCRIPTION
COOPERATIVE COMMUNICATIONS A NEW PARADIGM FOR WIRELESS NETWORKING?. David Goodman Wireless Internet Center for Advanced Technology (WICAT) Polytechnic University. CHALLENGES OF WIRELESS NETWORKING. Bandwidth Energy Mobility. CELLULAR PARADIGM. LICENSED RADIO SPECTRUM - PowerPoint PPT PresentationTRANSCRIPT
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COOPERATIVE COMMUNICATIONSA NEW PARADIGM FOR WIRELESS NETWORKING?
David Goodman
Wireless Internet Center for Advanced Technology (WICAT)
Polytechnic University
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CHALLENGES OF WIRELESS NETWORKING
Bandwidth
Energy
Mobility
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CELLULAR PARADIGM
LICENSED RADIO SPECTRUM
FIXED NETWORK INFRASTRUCTURE
ANYTIME, ANYWHERE
SYMMETRIC CHANNELS
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WI-FI PARADIGM
UNLICENSED RADIO SPECTRUM
INFRASTRUCTURE or AD HOC
HOT SPOTS
ASYMMETRIC CHANNELS
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WI-FI vs. CELLULAR
Isolated coverageLow mobilityInterference
PowerCost
Bit ratePowerCost
Ubiquitous coverageMobility
Infrastructure
WI-FICELLULAR
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WI-FI + CELLULAR
NOKIA: OWLAN
QUALCOMM: HOT-SPOT + CELLULAR BRIDGE
LUCENT: HAND-OFF (SEAMLESS CONNECTIONS)
COOPERATIVE COMMUNICATIONS: INFRASTRUCTURE + AD HOC
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NETWORK EFFICIENCY
MSC
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THEORETICAL INSIGHTS
Illinois: In dense ad hoc networks, throughput constant (thpt/node 0)
U. C. Berkeley: In dense ad hoc networks with moving terminals thpt/node constant (thptinfty)
Rutgers: Hot spots + mobility + P2P = fast, efficient dissemination
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COOPERATIVE COMMUNICATIONSRESEARCH GOALS
EXPLOIT MOBILITY
EXPAND BANDWIDTH
EXTEND BATTERY LIFE
PROMOTE RELIABILITY, RESILIENCE
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GEOGRAPHY OF INFORMATION
Where? Local, regional, everywhere
When?Instantaneous, recent, long-term
Who?Individual, group, general interest
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GEOGRAPHY
USERSSIGNALS INFORMATION
+ +LOCATION LOCATION LOCATION
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GEOGRAPHY
INFORMATIONRELEVANCE
LOCATIONTIME
POPULATION
ENVIRONMENT
RADIO PROPAGATIONINTERFERENCE
+ PEOPLE &MACHINES
LOCATIONMOTIONDEVICES
INFORMATION NEEDS
+
USERSSIGNALS INFORMATION
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7DS Columbia Application Infostations Rutgers/Poly
CAHAN NJIT Network
Cooperative coding Poly Physical
COOPERATIVE COMMUNICATIONSRESEARCH PROJECTS
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7DS COLUMBIA
Peer to peer data sharing
Efficiently deliver information of local interest
Conserve power
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P2P & CLIENT-SERVER
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INFOSTATIONS + AD HOC
Collection of hot spots feed data to terminals
Terminals in motion disseminate data
Two-way transactions required
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CAHAN - NJIT
Efficient routing between terminals and BS
Reduce power, increase bandwidth efficiency, signal quality
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k
CONGESTION
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Dead Spot
DEAD SPOTS
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COOPERATIVE CODING POLY
Path diversity combats fading
Reduce power, increase signal quality
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M1
BS
M2
COOPERATION BETWEEN 2 TERMINALS
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STRATEGY EXAMINE ENTIRE SYTEM - ALIGN
INFORMATION URGENCYLOCALIZATIONUSERS
ENVIRONMENT SIGNAL PROPAGATIONNETWORK ACTIVITY
TERMINALS LOCATIONMOTIONPOWER SUPPLY
NETWORK CELL-LANAD HOC/INFRA
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CHALLENGES
EACH TERMINAL SUPPLIES BANDWIDTH
ADDED TERMINALS REDUCE POWER NEEDS
INCENTIVES TO COOPERATE
SECURITY
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“a highercalling”