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During S1AP path switch request message, MME releases bearer for QCI 1 with radio network cause 30 and unknown erab id?

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During S1AP path switch request message, MME releases bearer for QCI 1 with radio network cause 30 and unknown erab id?
posted Aug 9, 2017 by anonymous

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2 Answers

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As per my understanding, nothing like that is mentioned in the specification. I think this is happening in your setup and this could be because of some issues in your software code.

answer Aug 13, 2017 by Harshita
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This happens, when UE is in handover state and suppose any party (calling or called party) disconnect the call and MME send the E-RAB release to source eNB, but as source eNB is in Handover processor and it will ignore the E-RAB release request and sent the response as failure, then Target eNB try to switch the path but MME already released the E-RAB so it will reply as Unknown E-RAB ID to target eNB.

answer Aug 16, 2017 by Ravinder Kumar
ty ravinder...so it is a normal behaviour or where this should be corrected
for eNB it's as per 3GPP but in MME we need to enhancement to hold the E-RAB id till HO process get completed.
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