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Cisco Bug: CSCvv88570 - SMF to handle DSReq (System-failure) -DBReq (RAT-Change) collision

Last Modified

Oct 11, 2020

Products (1)

  • Cisco Wireless Mobile Application

Known Affected Releases

2020.2

Description (partial)

Symptom:
Wifi to LTE HO calls are dropped

Conditions:
UE is moving from WiFi to LTE
Datapath Switching is already done for default bearer
SMF is waiting for CBResp from SGW for initiated CBReq.
SMF has not updated Session Info from WiFi->LTE.
eDPG sends DSReq (Sytem-Failure) when SMF is waiting on CBResp in LTE.
SMF clean up session when DBReq is received in WiFi Context and shall not send DBReq to LTE.
Since session cleaning up on SMF and UPF, the SGW might have received ?GTP-U Error Indication? and SGW might have done local-purge..
Later, eNB starts session cleanup.
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