Link Layer
Management of very low signal-to-noise ratios is of significant importance
- Unclear what coding schemes are best
- Convolutional - limited delay
- Concatenated (e.g. Reed-Solomon) - clean or out
- Turbo Codes - operation in very low SNRs, but never quite clean, plus typically long code blocks
- Ability to apply different coding regime to packets based on their QOS requirements may become very important
Resource reservation at MAC layer may be of significant importance
- Closed loop control of remote resources may require resource coordination at multiple layers, including interference avoidance at link layer