- This topic has 13 replies, 1 voice, and was last updated 11 years, 5 months ago by Fresh Opt.
16th September 2009 at 13:40 #58867OptimizerGuest
We’ve got loads of problems of ping-pong HOs.
WIll like to have possible solutions on how to reduce this.16th September 2009 at 14:17 #58868PixGuest
Could you decribe exactly what is the problem ?
How do you “see” it ?
Pix19th September 2009 at 07:58 #58869BijoyGuest
R u using Ericsson system?28th September 2009 at 11:18 #58870OptimizerGuest
We are using Alcatel system.
The ong-pongs are mostly between co-localised 900 and 1800 co-localised cells28th September 2009 at 20:44 #58871PixGuest
Your problem sounds extremely complicated, but since you describe it with only few words, it is impossible to give you an answer.
If you decide to spend some time describing it properly, then I might be able to help.
Pix18th October 2009 at 08:06 #58872Problem Resolved- HamzaGuest
this is what you need to do
change pbgtSrcellHreqave from 8 to 1 and it will resolve Ping Pong HO,
i dont know parameter name in ALCATEL but this will do you good in DCS-GSM networks24th October 2009 at 12:09 #58873Has UKGuest
Hamza is pbgtSrcellHreqave a Nokia or Ericsson parameter?
I use Ericsson RBS.
thx in advance.24th October 2009 at 18:32 #58874Fresh OptGuest
we have a microBTS installed on one high building (last 2 floors), there are a lot of ping-pong HO between a micro and macro cells. Which parameters to tune in order to reduce ping-pong HO. Four macro cells around are declared as umbrella and their level sometime are weakest than the other cells far from the building, so, it happens that in idle mode MS camps on those far cells and we have to declare HO between them and micro. How to avoid camping on those cells in order to stay in micro or macro around?
Fresh Opt24th October 2009 at 20:50 #58875PixGuest
Hi Fresh Opt,
1/ increase the Cell Reselect Offset of the Indoor cell, much above the CRO of outdoor Umbrella cells.
2/ the indoor cell is define as “Micro” or “Indoor” ? then there shouldn’t be any outgoing HO from this indoor to the umbrellas… (it’s automatic)
3/ enable the cause 14 in Umbrellas (already done, probably) (if not, then the parameter name is EN_MCHO_NCELL, or something like this), then tune the adjacency parameter L_RXLEV_CPT_HO(Umbrella, Indoor) to a little lower value : – 77dBm or -80dBm, etc.
The lower you go, the more traffic will be sent to the indoor cell. Don’t go too low 🙂
pix24th October 2009 at 22:49 #58876Fresh OptGuest
I’ll try that and inform for the results!
BR,25th October 2009 at 04:56 #58877PixGuest
for the point 2, I meant that the HO cause 12 is disabled from Micro to Umbrellas (automatically). But Emergency causes (bad level, bad quality, etc) are still enabled.
Ok, that’s all 🙂
pix26th October 2009 at 12:35 #58878Fresh OptGuest
Pix, I forgot something, what about cells too far from the building. Sometimes near the window MS camps on those cells and the call is initiated in cells which do not have HO declared with micro.
Regards,26th October 2009 at 12:51 #58879PixGuest
Declare incoming HO from Umbrellas to Micro, not (or little bit) outgoing.
There are so many neighbours at window, that it’s complex… You must work for the “better”, not for the perfect.26th October 2009 at 13:15 #58880Fresh OptGuest
Thanks Pix, I appreciate that.