Experts Team.
Based on drive test results we observed with increases of 5G-NR Tx Power Control Info PCell PRACH Data PRACH Preamble Tx Power [dBm]
5G-NR Tx Power Control Info PCell PRACH Data PRACH DL Pathloss [dB] also increased.
What could be the reason?
Bad UE or something else?
What’s on Y axis?
Is it correlation of PRACH power with Pathloss?
Yes, it is correlation of PRACH power with Pathloss.
Prach b,f,c (i) = min {Pcmax f,c (i) ,Pprach,target+PL b,f,c } [dbm]
Basically UE will use a path loss as a part of initial PRACH transmit power calculation.
So correlation with path loss is kinda expected behavior.
What is the correlation of PRACH power with Pathloss?
Higher Path loss, higher PRACH power needed.
This could just be your RF.
If you are driving in urban area with lots of high rise building taking turns etc. then you are likely going to see more interference.
Understood, thanks.
But that is just pathloss, calculated by UE.
Y axis is just path loss?
TBH the graph looks alright - linear relation between path loss and UE Tx power.
What do you think is issue there?
Y axis is path loss, X axis is UE power.
As path loss increases, UE uses more power to send PRACH until it hits UEs max power which is usually 20-24dB
Oh, got it.
UE Max power is 23 or 26 dBm based on UE class and band.
Do people set different values?
Don’t think UE initial power can be capped.
Whatever OEM builds, UE will try to reach that value until it gets response back on PRACH.
Also initial PRACH is open loop process so UE can go as wild as it can 
