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What is 4G to 3G Handover Failure Analysis about?

This document discusses a handover failure issue from 4G to 3G networks with a cause code of 153 on an Huawei MME. The root cause was identified to be a software parameter on the SGSN that was disabled, preventing it from recognizing relocation requests from the MME. Setting the software parameter to enabled resolved the issue and handovers were now successful. Traces were analyzed against the 3GPP standard to validate the fix aligned with expected call flows. The key lessons are to thoroughly analyze trace

Author

budi

Language

EN