可以参考36.213.
E_A – PDSCH EPRE when no RS is present within the OFDM symbol (symbol A)
E_B – PDSCH EPRE when RS is present within the OFDM symbol (symbol B)
E_RS – RS EPRE (Reference Signal)
E_A / E_RS = ρA -UE-specific (=PA)
E_B / E_RS = ρB -UE-specific
PB = ρB / ρA -cell-specific (signaled to UE)
PA = (-dlRsBoost) - UE-specific (signaled to UE; dlRsBoost from O&M)
Example with the cell-specific RS for 1 TX antenna (no boosting)
…assuming E_RS = E_A = PSD_0
Symbol A - 12 x E_A = 12 x PSD_0
Symbol B -10 x E_B + 2 x E_RS (…= Symbol A)
10 x ρB x E_RS + 2 x E_RS = 12 x PSD_0
10 x ρA x P_B x E_RS + 2 x E_RS = 12 x PSD_0
10 x E_A x P_B + 2 x E_RS = 12 x PSD_0
10 x PSD_0 x P_B + 2 x E_RS = 12 x PSD_0
…assuming E_RS to be boosted by dlRsBoost
P_B = 6/5 - 1/5 x dlRsBoost
…but w/o RS boosting dlRsBoost = 0 dB
P_B = 6/5 – 1/5 = 1