- This topic has 13 replies, 1 voice, and was last updated 11 years, 12 months ago by aye.
26th April 2009 at 11:39 #56879ErickGuest
Could somebody explain me why there is a high percent of HO failure from GSM1800 to GSM 900?26th April 2009 at 18:52 #56880forouzanGuest
Which vendor are you working with?also are you using common bcch or not?if the failure mostly between the co located 900/1800 cells or not?29th April 2009 at 10:34 #56881ErickGuest
I’m working eith Ericsson RBS 2116, and HO problem is between co-located sites GSM1800 and 900.30th April 2009 at 06:18 #56882forouzanGuest
is the parameter of cs:y in the adj. Relation?maybe by increasing the min signal level in adj. You will have ho in better situation between them.i’ll check some documents today and will reply you more exactly*bye bye5th May 2009 at 12:01 #56883AnastassiaGuest
We had the same problem in our network, it was caused by 5TER messaging. it was solved by some SW correction on MSC side, which I don’t remember.5th May 2009 at 12:08 #56884AnastassiaGuest
The solution is to activate ”GSM phase2 error handling” mechanism on all MSCs by setting the parameter phase2 from 0 to 1 at all MSCs for all BSCs.
Please inform me if it was helpful 🙂5th May 2009 at 13:08 #56885ErickGuest
I’ll check it with our MSC engineers.I’ll inform you:)5th May 2009 at 13:14 #56886ericGuest
forouzan, we tried with CS =YES and it was the same result, hig HO failure6th May 2009 at 12:09 #56887ErickGuest
Anastassia, the parameter phase2 is set on 1:(.8th May 2009 at 09:38 #56888AnastassiaGuest
Ok, is there everything OK with active BA lists?
Do you use HCS layers? What are the HCS parameters?9th May 2009 at 10:19 #56889ErickGuest
We have one HCS band, our network is quite small, with one BSC ans Msc, and with 3 layers. We use layer 3 for GSM 1800, layer 7 for GSM 900, and often layer 8 for umbrella sites. Layerthr is often set on 85.11th May 2009 at 13:05 #56890ayeGuest
You said you only have one BSC, was the high percentage of HO failure common in all cells in the BSC or on some Cells only?13th May 2009 at 13:14 #56891erickGuest
Hi, AYE. No, the problem is only with HO form GSM1800 to GSM900 cells.15th May 2009 at 04:12 #56892ayeGuest
If you have a multiband network check the ff parameter settings:
BSC DATA PARAMETER:
MODE = MULTI
GSYSTYPE = MIXED
CELL DATA PARAMETER
CSYSTYPE = frequency band used by BCCH(GSM900 or GSM1800).