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Hello,
Can any one explain what are the reasons behind RAB drop in UMTS?
Regards,
Nitin
I would say the reason is either coverage or sw bug, typically.
Hi John,
Thanks for the reply,I had checked missing neighbours, coverage, S.C etc. But it looks like ok. I had seen RAB drop rate heigh in many cells. So except sw bug, is their any other possibility for RAB Drop?
Regards,
Nitin
Hi,
Of course the drop can also happen due to some BTS issue, pre-emption, integrity check failure of some RRC message during e.g. radio bearer reconfiguration procedure (which happens failure often during UMTS nrt data call) & release from PS core (e.g. mismatch in Tias/Tiar timers between Core & RNC). I have also seen some UEs, which are using RRC:signallingConnectionReleaseIndication for PS CN wrongly and this is seen as RAB drop by some vendors’ RNC.
So need to play with some parameters to solve these problem?
Is yes, then what are these?If Tiar/Tias timer values are causing the RAB drops, then you must see equipments to see how to change those. It varies between the vendors.
I meant; …you must see equipments DOCUMENTATION
parameter name of rab drop causes
Hello , Can you please check CE Utilization and congestion of the specific RAB failure cells and it is recommended to reduce the non real time services data rates. Thanks
Hello , Can you please check CE Utilization and congestion of the specific RAB failure cells and it is recommended to reduce the non real time services data rates. Thanks
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