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Cisco Bug: CSCul54109 - MME after Detach Request to UE, goes to immediate UE context release

Last Modified

Dec 25, 2016

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

14.0(38)

Description (partial)

Symptom:
MME sends a NAS Detach Request, then immediately sends an S1AP UE Context Release Request and an S11 Delete Session Request.  The problem with this approach, as seen in the field, is that the eNodeB may not be able to forward the Detach Request to the UE if the UE Context Release Request arrives immediately afterwards and causes the eNodeB to tear down the radio resources without sending the Detach Request to the UE.  The end result is that the UE believes it is attached but Idle, when it is in fact detached.

Conditions:
This behavior is systematic.
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