David Goodman

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
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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

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GEOGRAPHY
12
GEOGRAPHY
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COOPERATIVE COMMUNICATIONSRESEARCH PROJECTS
7DS Columbia Application
Infostations Rutgers/Poly CAHAN NJIT
Network Cooperative coding Poly
Physical
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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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CONGESTION
k
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DEAD SPOTS
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COOPERATIVE CODING POLY
Path diversity combats fading Reduce power,
increase signal quality
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COOPERATION BETWEEN 2 TERMINALS
BS
M1
M2
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STRATEGY
EXAMINE ENTIRE SYTEM - ALIGN
INFORMATION URGENCY LOCALIZATION USERS E
NVIRONMENT 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
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a higher calling