Cooperation vs. Contention the wireless sandbox

1
Cooperation vs. Contention the wireless sandbox

• Mihaela van der Schaar (UCLA)
• application layer/games
• Srikanth Krishnamurthy (UCR)
• integration of cooperation with higher layers
• Syed Jafar (UCI)
• cooperate vs. contend do no harm
• Anna Scaglione (Cornell)
• randomized cooperation
• Urbashi Mitra (USC)
• coherent cooperation

2
Cooperative Californians

• Mihaela van der Schaar (UCLA)
• applications/non-cooperation? cooperation
• Srikanth Krishnamurthy (UCR)
• integration of cooperation with higher layers
• Syed Jafar (UCI)
• cooperate vs. contend do no harm
• Anna Scaglione (UCD)
• randomized cooperation
• Urbashi Mitra (USC)
• coherent cooperation

3
Multiple Antennae
RX
TX
multiple transmit/receive elements are co-located
TX
RX
RX
TX
gains performance/rate
4
Cooperation a vision?
?

cooperative multihop
multihop
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How to signal?

• How to design signals sent by cooperating nodes?
• Distributed space-time modulation for arbitrary
  number of hops/number of nodes at each stage
• Some sometime assumptions
• synchronization
• channel state at RX (TX?)

diversity slope 1.4
diversity slope 2
6
Who should cooperate?

• resource allocation problems
• size of cooperating set?
• members of cooperating set?
• decision process and percolation of decisions

cooperative estimation with finite network
power square source circles sensors
7
How do we scale?
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Questions

• Cooperation in NETWORKS
• versus single source/single destination
• medium access/multiple access
• bridging PHY and higher layers for cooperation
• What is a link?
• What is a collision?
• How to fully exploit the physical layer?
• new mathematical tools?
• new mathematical abstractions!
• for wireless PHY our models have served us
  well!

9
More Questions

• Overhead/cost
• abstraction for overhead (feedback rate/training
  length)
• sparse representations
• random versus deterministic (scheduled/structured)
  
• coherent versus random/robustness issues
• how modeled? (ray tracing random)
• Cognitive networks
• prioritized cooperation
• adaptive networks/adaptive signal processing
• network-centric signal processing
• trading off PHY for higher layers