link quality metric
Solution: Don’t! Relative metrics suffice
- Simply maintain proportional estimates
- End-to-end bandwidth probing will do the rest
But which metric?
- Packet arrival times
- Theoretically ideal, but far too noisy to be used in reality
- Short-term throughput
- Similarly difficult to measure
- Loss Rates
- With bounded queues, loss rates are a rough indicator of appropriate throughput, and easy to measure