UE cannot deceode BSIC in GSM

[wakaka555]

What kind of suitation/reason makes the UE cannot decode the BSIC GSM network?

recently i have a bad experience on this kind of matter...
the UE not always can decode the BSIC of cell A even the Rx level is high (around -50~60 dBm)
when the UE can decode the BSIC and locked in the cell A, and C/I is good when the Rx Lv aournd -50~60dBm.
Even the Rx lever around -85dBm, the C/I around 14~18

is anyone can explain this problem or any idea on this problem?

Many Thank!

[the.rf.consultant]

Are you sure your using the correct SIM card for the operator your trying to decode the BSIC?

[josogun2]

check if ur ue is not lock to network.
also try with other ue/SIM to rule out ue problem / sim.

[wakaka555]

yes, the UE was locked in the correct network. and i have tried different UE.

actually, during the DT, the UE makes a few call and no problem on dial up and HO, until to that location, cell 1 can detect the NL: cell 2 (target cell), cell 3 , cell 4
cell 3 and cell 4 can decode the BSIC, but cell 2 cannot....

btw, due to environment problem, cell 2 from -90dBm to -50 dBm around <6 sec, is it the change too rapid?
and at the same time, the Rx lv of cell 1 become weak (-80~85dBm) and the C/I become worse (10).

at first, it happened on 900 band (cannot not decode, but with high interference by other network), however, changed to 1800 band, the problem still here....but the C/I is ok

at other location and inside the coverage of cell 2, it can decode the BSIC....

any idea about this suitation?
many thank!!

[the.rf.consultant]

try to check on the defined neighbor relation parameters both ways for the concerned cells.

try to check also for conflict of BSIC definitions on cells w/in the BSC. Just maybe this problem is on the database of your DT tool.

[alkaloid]

On what vendor are you experiencing the problem?

I specialise in location based services, and have noticed measurement reports on our SMLC which is connected to ******** BSCs over Lb, in which the BSICs of all neighboring towers are set to zero.

This seems to be specific to Moto; ALU and Huawei do not have this issue.

[tsiz]

What kind of suitation/reason makes the UE cannot decode the BSIC GSM network?

recently i have a bad experience on this kind of matter...
the UE not always can decode the BSIC of cell A even the Rx level is high (around -50~60 dBm)
when the UE can decode the BSIC and locked in the cell A, and C/I is good when the Rx Lv aournd -50~60dBm.
Even the Rx lever around -85dBm, the C/I around 14~18

is anyone can explain this problem or any idea on this problem?

Many Thank!

You may be expericnig a conflicting BCCH and BSIC with the source cell. This will lead to Ue not decoding BSIC. Check for cells with same BCCH and BSIC.

[Ericsson_RND]

try to check on the defined neighbor relation parameters both ways for the concerned cells.

try to check also for conflict of BSIC definitions on cells w/in the BSC. Just maybe this problem is on the database of your DT tool.



Agreed with you the.rf.consultant.

[adewijaya]

in 2G will happend because of same BCCH + BSIC (NCC), for 3G same SC on neighbor list that it make getting same problem too

[9waves.9waves]

Which tool Are You using?
Is it for Same Operator?
I mean to say 3G is from Different Operator and 2G is Different Operator and If you are using ICR than it may problem.

Check it on that front...