- This topic has 5 replies, 1 voice, and was last updated 9 years, 3 months ago by VanG.
18th September 2012 at 11:55 #68579VanGGuest
please advise me how to tune my parameters to make more agressive power control to improve the DL quality? What are the optimal value for PC thresholds, averaging windows and power step sizes ?
Thank you in advance,
>>rrb19th September 2012 at 19:51 #68580pixGuest
there are no optimal values… there are default values, and then there are optimized values, for specific cells.
to make more agressive settings:
decrease L_RXLEV_DL_L by 3dB-to-6dB
decrease U_RXLEV_DL_L by 3dB-to-6dB
decrease A_LEV_PC by 1
And finally, reduce by “1” the parameters related to PC and which slow down PC command / ack messages. Unfortunately, i don’t recall their exact names. They contain the string “INT” and “ACK”.
Instead of 2 and 1, set 1 and 0 (ie. -1 for each of them).
And that’s about it.
pix20th September 2012 at 06:19 #68581VanGGuest
Thak you Pix,
I’ll try this and give you feedback.The basic problem is that the our Freq plan is so limited and for this reasons there are a lot of cell with higher DL quality HO and drops…
##rrb20th September 2012 at 10:06 #68582pixGuest
if you are using hopping, then you can increase Offset_hopping, which will allow worse RXQUAL for PC and for HO, if the cell is using hoping.
It is very convenient.
l_rxqual_dl_p = 3 (acceptable rxqual in dl for PC)
l_rxqual_dl_h = 4 (threshold for HO qual in DL)
if you set offset_hopping = 1.5, then :
PC threshold = 3 + 1.5 = 4.5
HO threshold = 4 + 1.5 = 5.5
1 is standard.
value of 1.5 is “optimized”. A value > 1.5 is rather aggressive… Try steps of 0.2 (1.5, 1.7, 1.9…)
pix26th September 2012 at 13:11 #68583VanGGuest
Thank you Pix,
I just tried to tune PC for cells whitout hopping.. After that I’ll give you feedback.
Once again thank you for your help !!
>>rrb29th September 2012 at 09:29 #68584VanGGuest
I was tried to change the PC parameters for some cells with high DL quality drops but there is no improvement for them…
My current setting for this cells are :
BS_P_CON_ACK (x 2 SACCH)=2
BS_P_CON_INTERVAL (x 2 SACCH)=1
L_RXLEVULP (dBm) =-95
MS_P_CON_ACK (x 2 SACCH)=2
MS_P_CON_INTERVAL (x 2 SACCH)=1
U_RXLEVULP (dBm) =-85
Are they correct ?