In the existing system, Vidyalankar Institute of Technology henceforth addressed as VIT Library is situated on 3rd floor. Its a bit tiresome for students and professors to go upstairs for just returning books or just to extend the book return date. E
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3g
Performance ManagementFull description
Filename: Analysis for Call Drop due to SRB Reset & TRB Reset (gaobo40827).docxFull description
thinkiit
Prestress losses
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DUE DILIGENCEFull description
PS drop call caused by GTPU failure 【Phenomenon Description】In
G country C project, We are reported that there are
some GTPU Failure caused call drop recently, but there is no such kind of call drop before:
【 Alarm Information:】none. 【Cause Analysis】
From log data and product code, we found it is caused by an inproper process mechanism in the board GOUc. And this problem is triggered when switch on Direct Tunnel (One Tunnel) in CN. In the sceanario of Direct Tunnel, after RAB release due to User Inactive, according to protocol, resoures of RAN side will be released, but PDP context will be reserved between SGSN and GGSN. In the procedure of connection reestablishment between SGSN and GGSN, GGSN will set the address of User plane to SGSN. GTPU packet from GGSN will be sent via SGSN. Different to single-core board, multi-core board GOUc will check the IP packet packet from source at this this time, time, and and the result result will be failur failure. e. So an Erro Errorr Indica Indicatio tion n will will be triggered. Thus generate a GTPU Failure caused call drop.
【 Handling
Process: 】 R&D
had
fixed
this
problem
in
the
RNC
version
of
BSC6900V900R011C00SPH732 . After upgrade the RNC version, the problem solved.
【Suggestions and Summary】 When we meet some special value of drop calls, we should open a ticket to R&D to analyze it. For us, it is better to read the document of precaution.
