Cisco Bug: CSCuj95866 - S4-SGSN: IRAT From LTE to UMTS with RAU - idle mode at LTE fails.
Feb 06, 2017
- Cisco ASR 5000 Series
Known Affected Releases
Symptom: S4-SGSN: IRAT From LTE to UMTS with RAU - idle mode at LTE fails. Conditions: When we try to do Handover from LTE to UMTS with RAU , SGSN is taking the new configured S interfaces(S4/S3/S12) to register the SPGW and for creating the bearer. Key Observations from the logs : - RAU is recieivng at SGSN when we shut LTE signal and MME/SGSN context transfer through S3 is also good. - After RAU reaches the SGSN , SGSN does a DNS query and it is responding with the correct S3 Ip( In our case S11 Loopback at MME) - Right after this we are receiving an ISD from HLR , and it is giving the Wildcard APN(*) to the SGSN. - SGSN is generating Delete session Request and UE is detaching. After this procedure UE does a fresh attach in the SGSN (3G) through S interfaces.
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