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Mesh Capacity WG

Mesh Capacity WG. Outline. Technologies What band(s) should we use? What antennas should we use? What architecture should we use? Closed platforms are a pressing problem Goals: What do we need? Evaluation Repeatability is a major concern What should we be repeating?. Frequency choice.

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Mesh Capacity WG

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  1. Mesh Capacity WG

  2. Outline • Technologies • What band(s) should we use? • What antennas should we use? • What architecture should we use? • Closed platforms are a pressing problem • Goals: What do we need? • Evaluation • Repeatability is a major concern • What should we be repeating?

  3. Frequency choice • Design space is huge • What radio technology gives what data rate in what propagation environment? • Do we need to lobby FCC for lower frequency range, or can we achieve our goals without this? • Channel and source coding schemes • Includes rate selection, error correction, multipath resilience • Many permutations are unexplored in a systems context • Additional complications: space-time codes, etc.

  4. Antennas and Scalability • Steerable Antennas work outside, not indoors • Would a simple SVD replacement to steering be enough for indoors? • Transmitter power control yields what gain? • How much better is MIMO? • Cognitive radios yield what gain? • Wideband communication is still poorly understood in many ways!

  5. Architecture • Closed platforms are a pressing limitation! • Everyone wants hardware where they can do arbitrary interesting things, but keep everything else • Promising approaches: • Software radios: high end that can emulate a large variety of low ends • FPGAs/ASICs (a la Berkeley proposal) • How do we define interfaces that allow cross-layer innovation?

  6. What do we need? • 1Mbps/user would rock!

  7. Lack of repeatability is a major concern • Is simulation necessary for benchmarks? • Would a new model be enough to achieve fidelity? Is anyone making progress on this? • Does physical emulation yield a better tradeoff between repeatability and realism? • E.g., recent CMU research using DSPs between the wires • Is a testbed necessary? • If so, does this need to be a shared investment? What scale is interesting? What radios are interesting? How to achieve repeatability? • Innovation at all levels of protocol stack  benchmark needs to allow change at all levels • E.g., try a new MAC/PHY/both • We need both a simulator that is validated against reality and testbeds.

  8. What benchmarks are good? • Strawman proposal • In-home Mesh • Community Mesh (neighbor to neighbor) • 2 Tropos scenarios • End users funneling into ITAP • Police cars funneling into ITAP • PacketHop scenario • Incident command center • Darpa scenario • Tanks and Helicopters and things • What other scenarios?

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