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Cisco Bug: CSCup14786 - DDN-cause[error_Ind_rcvd_rnc]frmSGW during IM entry not handled properly

Last Modified

Dec 24, 2016

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

16.2(0)

Description (partial)

Symptom:
DDN-cause[error_Ind_rcvd_rnc]frmSGW during IM entry not handled properly

Conditions:
DDN  with casue [EGTP_CAUSE_ERROR_IND_RCVD_RNC_ENODE (0x06)] is not handled properly as per the fix provided by the PR CSCum50504 in the below scenario.

1, UE gets Attached to MME successfully.
2, S1-Release procedure is initiated by sending CONTEXT_RELEASE_REQ from
eNB to MME.
3, MME forwards RELEASE_ACCESS_BEARERS_REQUEST to SGW and there is no
Response from SGW.
4, At this time SGW sends DOWNLINK_DATA_NOTIFICATION to MME with cause
EGTP_CAUSE_ERROR_IND_RCVD_RNC_ENODE.
5, Here MME replies back EGTP_DOWNLINK_DATA_ACKNOWLEDGE with cause
EGTP_CAUSE_NO_RESOURCES_AVAILABLE.

N/w triggered Service Req procedure is not initiated as per the  spec.

In this case the Expected behavior is MME should abort im_entry procedure and and start im exit
procedure.
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