PS Drop Call after Cell Update Process (RIP Cause)
Hi expert,
In my network I have experienced the next problem in PS Drop Call:
After UE changes from DCH to FACH, in FACH sate there are a lot Cell Update Request, some of them are response successfully, but 50% of them are not.
In the image you can see, Cell Update Request by UE, in this message there is information about (u_RNTI - srnc_Identity / s_RNTI), then RNC acknowledges the message by RRC Cell Update Confirm with new c-RNTI, but after this no response from UE, after send twice Cell Update there is a Iu Release with cause 14 (Failure in the Radio Interface Procedure).
Can you help me with ideas to find where the problem is.
Re: PS Drop Call after Cell Update Process (RIP Cause)
Originally Posted by aleon23
Hi linhhy,
Attached you can find 2 log file, because the one of the images is based on another toold that I cannot export it.
Regards,
I dont see any issue with cell_FACH state. The problem comes frome cell_PCH. After UE changed to Cell_PCH, it had a lot of Cell Update caused by Cell reselection, and the system release UE out of Cell_PCH to Idle. Let me check Huawei algorithm for this issue and come back later.
Re: PS Drop Call after Cell Update Process (RIP Cause)
Originally Posted by linhhy
I dont see any issue with cell_FACH state. The problem comes frome cell_PCH. After UE changed to Cell_PCH, it had a lot of Cell Update caused by Cell reselection, and the system release UE out of Cell_PCH to Idle. Let me check Huawei algorithm for this issue and come back later.
Thanks for your reply linhhy,
Actually the problems are in FACH and PCH, exactly, with a lot cell update with cause "cellreselection", also all these fails are mapped random for all the network.
Re: PS Drop Call after Cell Update Process (RIP Cause)
Originally Posted by aleon23
Thanks for your reply linhhy,
Actually the problems are in FACH and PCH, exactly, with a lot cell update with cause "cellreselection", also all these fails are mapped random for all the network.
I appreciate for you kindly help.
I'll waiting for your answer!
Thanks in advance.
Sorry brother, I cant find real root cause for this case. But in the logfile I think it's not network problem. I may be cause from Smartphone UE, I mean UE initial release PS connection in cell_PCH to save power. (signallingConnectionReleaseIndicationCause: 0 ( uERequestedPSDataSessionEnd))
What's your vendor and what is release version? Do you have Enhanced Fast Dormancy Feature?
Re: PS Drop Call after Cell Update Process (RIP Cause)
Originally Posted by linhhy
Sorry brother, I cant find real root cause for this case. But in the logfile I think it's not network problem. I may be cause from Smartphone UE, I mean UE initial release PS connection in cell_PCH to save power. (signallingConnectionReleaseIndicationCause: 0 ( uERequestedPSDataSessionEnd))
What's your vendor and what is release version? Do you have Enhanced Fast Dormancy Feature?
The vendor is HW, R16, EFD actually enable man.
But it is a release from the system but after all these cellupdate, that is the strange in this case.
Bookmarks