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Table 2 Three possible channel state regions for the fading channel state χ for STPC

From: Optimal power policies and throughput scaling analyses in fading cognitive broadcast channels with primary outage probability constraint

Region Channel Optimal Outage Probability
  state power at PU  
  region control   
1 g<g T P O Yes (PU turns OFF) ε p 0
2 gg T , 1 , χ B , st 2 , χ B , st P O Yes ε p ε p 0
3 gg T , 1 , χ B , st > 2 , χ B , st p RP =0 No 1−ε p