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CLOT Issue Analyzing
(VoLTE Call Drop)
7.Mar, 2015
Joohyun,Kim
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Summary-Case Study-1/2/3
Cluster_AP-TNDR-0236-C2(VoL)
Key VoLTE Drop
Call drop was caused by Mobile to Server test scenario(known issue) By server setting, every 15 minutes, UE could have call drop by no-RTP
This is not KPI fail, but UE should have Byemessage
If there are call drop for VoLTE call attach in VoL UE, this is call drop(Refer to Next Slide)
Call Drop was caused by end by user
This is not KPI fail
Call Drop was caused by 500 Server internal error
Server Internal Error 5xx responses are failure responses given when a server itself has
erred
AP-TDNR-0236-C2 Call drop summary
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Cause of Failure(Code 500 error)
For VoLTE Attach , Call drop happened by SIP Fail cause Code 500
Code 500 : Server Internal Error 5xx responses are failure responses given when a server itself has erred
UE didnt receive the 183 session progress
Case Study-1(VoLTE Call Drop)
500 Server Internal Error
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Call drop by serve call scenario
Call drop was caused by Mobile to Server test scenario(known issue)
By server setting, every 15minute, UE could have call drop by no-RTP
This case is not KPI fail , but UE, UE should send the Byemessage
Case Study-2(VoLTE Call Drop)
500 Server Internal Error
15 minutes period
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Call Drop was caused by end by user
Call drop was caused by end By user
This is not KPI fail about this case
Case Study-3(VoLTE Call Drop)
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Summary_Case Study-4(Drop-Bye)
CLUSTER TN-EROD-0037_VOL-ISSUE LOG(VoL)
Why there are happened like Drop-Bye
Call drop was caused by User disconnected call by screen or ear phone button. It is not KPI Fail
Below is the event situation by tester
1st : User disconnected call by screen or ear phone button
2nd : User stopped Smart DM
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Case Study-4(Drop-Bye)
CLUSTER TN-EROD-0037_VOL-ISSUE LOG(VoL)
Why there are happened like end by user
Call drop was caused by end by user from user stopped smart DM. It is not KPI Fail
Below is the event situation by tester
1st : User stopped Smart DM
2ND : Smart DM Automatically disconnected call
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End By User
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Case Study-4(Drop-Bye)
CLUSTER TN-EROD-0037_VOL-ISSUE LOG(VoL)
During the test, there was some other call from other UE
Event through, test UE is MO but MO UE received Rx-invite Msg form other UE It is strange situation
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Summary_Case Study-5(BR-RNCH-0258)
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After sending the 100 Trying Message, UE receive the SIP 200 OK lately
During the issue time, signal is good and RLC Layer is normal
In abnormal case, time between 100 trying and QCI 1 Bearer with 183 session progress is
more than 20000ms
In this event time is only depend on IMS core side
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Issue CLOT(BR-RNCH-0258)
In abnormal case, time between 100 trying and QCI 1 Bearer with 183 session progress is more
than 20000ms
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Issue CLOT(BR-RNCH-0258)
During the issue time, signal is good and RLC Layer is normal
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Issue CLOT(BR-RNCH-0258)
During the issue time, There is only depend on IMS core side
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Issue CLOT(BR-RNCH-0258) During the issue time, There is only depend on IMS core side
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Server error Code
Appendix(SIP Response Table)
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Error Code Contents
500 Internal Server Error
501 Not Implemented
502 Bad Gateway
503 Service Unavailable
504 Server Timeout
505 SIP Version Not Supported
513 Message Too Large
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Copyright and Confidentiality
Copyright 2014 SAMSUNG Electronics Co., Ltd. SAMSUNG Electronics reserves the right to make changes to the specifications
of the products detailed in this document at any time without notice and obligation to notify any person of such changes.
Information in this document is proprietary to SAMSUNG Electronics Co., Ltd. No information contained here may be copied,
translated, transcribed or duplicated by any form without the prior written consent of SAMSUNG Electronics.
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