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12th April 2010 at 11:58 #62068RamGuest
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, ram12th April 2010 at 13:11 #62069BijoyGuest
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.
Bijoy13th April 2010 at 05:00 #62070RamGuest
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
ram13th April 2010 at 05:12 #62071xyzGuest
plz check whether the Bsc Point codes of thes sites are correctly defined
also plz ensure whether the GT routings are defined properly13th April 2010 at 06:38 #62072RamGuest
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”
ram.13th April 2010 at 07:25 #62073xyzGuest
ok then check the BSC point codes of the mentioned cells.it might be different from the required point code.15th April 2010 at 06:25 #62074Mania,Guest
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.15th April 2010 at 09:28 #62075BijoyGuest
Could you expalin as how could this happen??Really curious.
Bijoy15th April 2010 at 11:52 #62076AliAsgherGuest
Which vendor are you working with? Is it Huawei?16th April 2010 at 17:41 #62077ManiaGuest
Nope… its NSN, Motorola and Alcatel17th April 2010 at 19:43 #62078RamGuest
It is Ericsson. Both BSC and MSC are from Ericsson.