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Invalid Cell in BSSMAP HO message

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  • #62068 Reply
    Ram
    Guest

    Hi all,
    This is related to Inter MSC HO. All the definitions are available in both BSC and MSC. All data including BSIC, BCCH, CGI are same and correct. Still inter MSC HO fails between specific set of cells with BSSMAP HO failure reason as “Invalid Cell”.

    what could be the reason for the failure. Due to this MSC replies the source BSC as “equipment failure”.

    Thanks, ram

    #62069 Reply
    Bijoy
    Guest

    Ram
    Have you checked whether external LAC definition is proper.We need to define target MSC LAC’s as external LAC in the source MSC & vice versa.

    Br\\
    Bijoy

    #62070 Reply
    Ram
    Guest

    Hi Bijoy,
    This is E/// BSC & MSC. As mentioned all the values are defined. In E/// the complete external cell has to be defined instead of LAC. In BSC side also the BSIC, BCCH values are properly defined. After analysis i found a single cell attempting HO towards three other cells have HO failure in MSC side. From BSC side they claim HO stats are normal for the particular cell. Greatly confused

    thanks,
    ram

    #62071 Reply
    xyz
    Guest

    hi ram

    plz check whether the Bsc Point codes of thes sites are correctly defined

    also plz ensure whether the GT routings are defined properly

    #62072 Reply
    Ram
    Guest

    Hi,
    other HO between the MSC s are working fine. when i checked with internet for invalid cell the expl is – “when the subscriber has moved from the coverage area this type of error code will be returned by BSSAP”

    thanks,
    ram.

    #62073 Reply
    xyz
    Guest

    ok then check the BSC point codes of the mentioned cells.it might be different from the required point code.

    #62074 Reply
    Mania,
    Guest

    Hi,
    You could also have a neighbour audit (external + internal) of the source cell on which attempts are being generated.
    It might be a case where you have defined a far off neigbour but missed a nearby neighbour due to BCCH/ BSIC clash and MS measures this BCCH/BSIC (of the nearby cell not defined) and attempts on the far off cell. Which fails as MS cannot camp.

    #62075 Reply
    Bijoy
    Guest

    Hi
    Could you expalin as how could this happen??Really curious.

    Br\\
    Bijoy

    #62076 Reply
    AliAsgher
    Guest

    Dear Mania,

    Which vendor are you working with? Is it Huawei?

    #62077 Reply
    Mania
    Guest

    Nope… its NSN, Motorola and Alcatel

    #62078 Reply
    Ram
    Guest

    Hi guys,
    It is Ericsson. Both BSC and MSC are from Ericsson.

Viewing 11 posts - 1 through 11 (of 11 total)
Reply To: Invalid Cell in BSSMAP HO message
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