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 zBandwidth zEnergy zMobility

3. CELLULAR PARADIGM zLICENSED RADIO SPECTRUM zFIXED NETWORK INFRASTRUCTURE zANYTIME, ANYWHERE zSYMMETRIC CHANNELS

4. WI-FI PARADIGM zUNLICENSED RADIO SPECTRUM zINFRASTRUCTURE or AD HOC zHOT SPOTS zASYMMETRIC CHANNELS

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

6. WI-FI + CELLULAR zNOKIA: OWLAN zQUALCOMM: HOT-SPOT + CELLULAR BRIDGE zLUCENT: HAND-OFF (SEAMLESS CONNECTIONS) zCOOPERATIVE COMMUNICATIONS: INFRASTRUCTURE + AD HOC

7. NETWORK EFFICIENCY MSC

8. THEORETICAL INSIGHTS zIllinois: In dense ad hoc networks, throughput  constant (thpt/node  0) zU. C. Berkeley: In dense ad hoc networks with moving terminals thpt/node  constant (thpt  infty) zRutgers: Hot spots + mobility + P2P = fast, efficient dissemination

9. COOPERATIVE COMMUNICATIONS RESEARCH GOALS zEXPLOIT MOBILITY zEXPAND BANDWIDTH zEXTEND BATTERY LIFE zPROMOTE RELIABILITY, RESILIENCE

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

11. GEOGRAPHY USERSSIGNALS INFORMATION + + LOCATION

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

13. 7DSColumbia Application InfostationsRutgers/Poly CAHANNJIT Network Cooperative codingPoly Physical COOPERATIVE COMMUNICATIONS RESEARCH PROJECTS

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. k CONGESTION

19. Dead Spot DEAD SPOTS

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

21. M1 BS M2 COOPERATION BETWEEN 2 TERMINALS

22. STRATEGY EXAMINE ENTIRE SYTEM - ALIGN INFORMATIONURGENCY LOCALIZATION USERS ENVIRONMENTSIGNAL PROPAGATION NETWORK ACTIVITY TERMINALSLOCATION MOTION POWER SUPPLY NETWORKCELL-LAN AD HOC/INFRA

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

24. “a higher calling”