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David Goodman Wireless Internet Center for Advanced Technology (WICAT) Polytechnic University

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

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David Goodman Wireless Internet Center for Advanced Technology (WICAT) Polytechnic University

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  1. COOPERATIVE COMMUNICATIONS A NEW PARADIGM FOR WIRELESS NETWORKING? David Goodman Wireless Internet Center for Advanced Technology (WICAT) Polytechnic University

  2. CHALLENGES OF WIRELESS NETWORKING • Bandwidth • Energy • Mobility

  3. CELLULAR PARADIGM • LICENSED RADIO SPECTRUM • FIXED NETWORK INFRASTRUCTURE • ANYTIME, ANYWHERE • SYMMETRIC CHANNELS

  4. WI-FI PARADIGM • UNLICENSED RADIO SPECTRUM • INFRASTRUCTURE or AD HOC • HOT SPOTS • ASYMMETRIC CHANNELS

  5. WI-FI vs. CELLULAR CELLULAR WI-FI J Ubiquitous coverage Mobility Infrastructure Bit rate Power Cost L Power Cost Isolated coverage Low mobility Interference

  6. WI-FI + CELLULAR • NOKIA: OWLAN • QUALCOMM: HOT-SPOT + CELLULAR BRIDGE • LUCENT: HAND-OFF (SEAMLESS CONNECTIONS) • COOPERATIVE COMMUNICATIONS: INFRASTRUCTURE + AD HOC

  7. NETWORK EFFICIENCY MSC

  8. 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 (thptinfty) • Rutgers: Hot spots + mobility + P2P = fast, efficient dissemination

  9. COOPERATIVE COMMUNICATIONSRESEARCH GOALS • EXPLOIT MOBILITY • EXPAND BANDWIDTH • EXTEND BATTERY LIFE • PROMOTE RELIABILITY, RESILIENCE

  10. GEOGRAPHY OF INFORMATION Where? Local, regional, everywhere When? Instantaneous, recent, long-term Who? Individual, group, general interest

  11. GEOGRAPHY + + LOCATION LOCATION LOCATION SIGNALS USERS INFORMATION

  12. GEOGRAPHY + + INFORMATION RELEVANCE ENVIRON MENT PEOPLE & MACHINES SIGNALS USERS INFORMATION RADIO PROPAGATION INTERFERENCE LOCATION MOTION DEVICES INFORMATION NEEDS LOCATION TIME POPULATION

  13. COOPERATIVE COMMUNICATIONSRESEARCH PROJECTS 7DS Columbia Application Infostations Rutgers/Poly CAHAN NJIT Network Cooperative coding Poly Physical

  14. 7DS COLUMBIA Peer to peer data sharing Efficiently deliver information of local interest Conserve power

  15. P2P & CLIENT-SERVER

  16. INFOSTATIONS + AD HOC Collection of hot spots feed data to terminals Terminals in motion disseminate data Two-way transactions required

  17. CAHAN - NJIT Efficient routing between terminals and BS Reduce power, increase bandwidth efficiency, signal quality

  18. CONGESTION k

  19. DEAD SPOTS Dead Spot

  20. COOPERATIVE CODING POLY Path diversity combats fading Reduce power, increase signal quality

  21. COOPERATION BETWEEN 2 TERMINALS BS M1 M2

  22. STRATEGY EXAMINE ENTIRE SYTEM - ALIGN INFORMATION URGENCY LOCALIZATION USERS ENVIRONMENT SIGNAL PROPAGATION NETWORK ACTIVITY TERMINALS LOCATION MOTION POWER SUPPLY NETWORK CELL-LAN AD HOC/INFRA

  23. CHALLENGES EACH TERMINAL SUPPLIES BANDWIDTH ADDED TERMINALS REDUCE POWER NEEDS INCENTIVES TO COOPERATE SECURITY

  24. “a higher calling”

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