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Cisco Bug: CSCvs02833 - ERAB Setup for IMS default bearer followed by ERAB Modification for 5G result with semantic error

Last Modified

Oct 10, 2020

Products (2)

  • Cisco MME Mobility Management Entity
  • Cisco MME Mobility Management Entity

Known Affected Releases

21.11.16 21.12.15 21.14.20 21.14.9 21.17.4 21.18.0 21.20.0 21.5.28

Description (partial)

Symptom:
when there is an ongoing E-RAB set up request for (ERAB ID =6)   from MME to Enode-b &  another E-RAB Modify Indication ( 5G NR path update) from Enode-b to MME for E-RAB id 5.
MME reject E-RAB modification request with "semantic error " as response& followed by UE-release.

Conditions:
1. Initial context Setup Request followed by response for Data APN bearer ERAB ID=5 
2. Modify bearer request and response for ERAB-5 for Data APN 
3. Create session Request and response for IMS APN 
4. ERAB-Setup Request from MME to ENB for IMS default bearer (ERAB ID =6) 
5. E-RAB Modify Indication ( 5G NR path update) from Enode-b to MME for E-RAB id 5 
6. After this MME is sending E-Modification Confirm with [Protocol-cause=semantic-error] followed by UE release.
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