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Bug #1816

closed

USSD works only when IuCS is released

Added by neels over 5 years ago. Updated almost 5 years ago.

Status:
Rejected
Priority:
Low
Assignee:
Category:
-
Target version:
-
Start date:
10/10/2016
Due date:
% Done:

0%

Resolution:
Spec Reference:

Description

Using the ip.access nano3g, I observe some unreliability when issuing USSD requests
from the UE towards the CN:

  • When a registered UE's IuCS is in release, a USSD request succeeds very quickly:
    an InitialUE message with a CM Service Request "wakes up" IuCS,
    authentication and ciphering is established, then the USSD goes through.
  • When the IuCS is not released yet but still open, e.g. a USSD is issued
    right after a call or another USSD request, no message at all is received
    from the nano3G. The phone shows a USSD processing dialog that "hangs".
    I expect a Supplementary Services message to show on the Iuh to be
    forwarded to IuCS, but the nano3G stays quiet. The USSD times out.
    Waiting for another IuCS release and sending the same USSD again is then
    successful again.

I assume this is a problem with the nano3G specifically.
Check how the SysmoCell behaves in this scenario.

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