- This topic has 4 replies, 1 voice, and was last updated 11 years, 5 months ago by aso.
10th August 2009 at 11:07 #58365asoGuest
I need your helps for one problem i faced when the parameter(EN_MultibandPBGT_HO) disabled the PBGT HO reduced and HO due to DL/UL level increase how can i improve HO to be better cells and the reason for disabling this parameter is to reduce ping pong HO between 900 and DCS .
and if I enabled this again and play on HO_margin does it solve ping pong HO or not?
Your help appreciated.10th August 2009 at 17:50 #58366PixGuest
This parameter is very special and is a key parameter for dual band network tuning, especially regarding collocated cells (1800 with 900)
if you disable it, you must then enable the capture HO cause 21 (preferred band HO)
your tuning will look like this:
In cells 1800:
EN MultiBand HO = Disable, to prevent HO back to 900 cells.
L_RXLEV_DL_H = -85dBm (threshold to exit the 1800 cell properly, since there is no more PBGT HO to 900 cells… this is a very special setting to allow a clean and smooth exit from 1800 to 900)
In cells 900:
EN Preferred band HO = Enable, to force HO towards 1800.
L_RXLEV_CPT_HO(900, 1800) = -80dBm (threshold to enter the 1800 cell)
in all cells:
HO MARGIN = 5dB
MS enters a 1800 cells at -80dBm
MS exits from 1800 cells at -85dBm
If you are not happy with the value, that’s ok, but keep in mind you must change both thresholds symmetrically.
the HO cause 5 (DL LEVEL HO) detected in a cell 1800 shall be now considered as a “better cell” HO, like the Power Budget HO 🙂11th August 2009 at 09:41 #58367asoGuest
Thanks for you help most important for me is your explanation. so what will you recommend for the EN_MULTIBAND_PBGT_HO .
and more thing ( if iam not bothering) if we play HIGH_TRAFFIC_LOAD and low_TRAFFIC_LOAD it can be traffic absorbed by 1800.
BR11th August 2009 at 19:40 #58368pixGuest
i gave you the recommended value in my previous post
by setting the high_traffic_load in the 1800 cells, you can increase or decrease the amount of HO preffered band form GSM900 to DCS1800 cells.
don’t forget to set, in the 900 cell, to set MULTIBAND TRAFFIC CONDITION = ANY LOAD.
if you increase high_traffic_load (1800) to 90%, then the number of HO will increase, pushing more traffic to 1800 until their load reach 90%12th August 2009 at 09:01 #58369asoGuest
Thanks now every thing is clear.