you are mixing the names, so i didn’t really get your statement 🙂
you said :
By the way, from your equation, If ALPHA=0, and I set GAMMA_TNx=10*2dB = 20dB, then it would be :
PCH = min(GAMMA0 – GAMMA_Tnx – ALPHA*(C+48),Pmax)
PCH=min(39dBm – 20dB-0,43 dBm)
then PCH = 19 dBm.
It means the MS will transmit at a power of 19dBm instead of 39dBm (well, max MS power is actually Pmax = 33dBm)
There is an attenuation of 20dB. That is the attenuation due to UL PC GPRS.
If you set Gamma TNX = 0, you see that the power of MS = min(39dBm,33dBm) = 33dBm.
With default ALU values, the alpha introduces a variable adjustment depending on the current RXLEV measured. If RxLev is low, the attenuation is less : the MS transmits louder (PCH = stronger).
If RxLEv is high, the attenuation is more : the MS will reduce its transmission power (Pch = weaker).
The MS transmission power = Pch.
The failure of the UL PC GPRS happens randomly. So as long as you keep the UL PC GPRS activated, you run a risk to face a failure. Tomorrow, next week, in 3 months… who knows. Safe choice is to deactivate all the time.