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Handover?Urgent help!

Viewing 14 posts - 1 through 14 (of 14 total)
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  • #56879 Reply
    Erick
    Guest

    Could somebody explain me why there is a high percent of HO failure from GSM1800 to GSM 900?

    #56880 Reply
    forouzan
    Guest

    erick
    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?

    #56881 Reply
    Erick
    Guest

    I’m working eith Ericsson RBS 2116, and HO problem is between co-located sites GSM1800 and 900.

    #56882 Reply
    forouzan
    Guest

    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 bye

    #56883 Reply
    Anastassia
    Guest

    hi, Erick!
    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.

    #56884 Reply
    Anastassia
    Guest

    Found!!

    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 🙂

    #56885 Reply
    Erick
    Guest

    Hi,Anastassia!
    I’ll check it with our MSC engineers.I’ll inform you:)

    #56886 Reply
    eric
    Guest

    forouzan, we tried with CS =YES and it was the same result, hig HO failure

    #56887 Reply
    Erick
    Guest

    Anastassia, the parameter phase2 is set on 1:(.

    #56888 Reply
    Anastassia
    Guest

    Ok, is there everything OK with active BA lists?
    Do you use HCS layers? What are the HCS parameters?

    #56889 Reply
    Erick
    Guest

    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.

    #56890 Reply
    aye
    Guest

    Hi Erick,
    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?

    #56891 Reply
    erick
    Guest

    Hi, AYE. No, the problem is only with HO form GSM1800 to GSM900 cells.

    #56892 Reply
    aye
    Guest

    Hi Erick,
    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).

    regards,
    aye

Viewing 14 posts - 1 through 14 (of 14 total)
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