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N2 handover - Downlink RAN Status Transfer failure fix #305

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merged 2 commits into from
Sep 25, 2024

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JayaramRCDAC
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@JayaramRCDAC JayaramRCDAC commented Sep 23, 2024

Issue:
N2 Handover failure due to SendDownlinkRanStatusTransfer() not being called after Uplink RAN Status Transfer.

Troubleshoot:
Upon investigation, it was found that the function SendDownlinkRanStatusTransfer() was not triggered, which led to the failure of the N2 handover process.

Fix:
The issue has been fixed by ensuring that SendDownlinkRanStatusTransfer() is called with the target UE after the Uplink RAN Status Transfer.

Supporting Data:
N2-Handover-PCAP-Logs.zip

@thakurajayL
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Will review it today !

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@gab-arrobo gab-arrobo left a comment

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How can I replicate the issue such that I can test your PR?

ngap/handler.go Show resolved Hide resolved
@gab-arrobo
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How can I replicate the issue such that I can test the PR?

@JayaramRCDAC
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How can I replicate the issue such that I can test your PR?

We have tested N2 handover using both a simulation tool and a physical UE. In both cases, the gNodeB did not receive the Downlink RAN Status Transfer.
If you'd like, we can share the details of the test cases to help you replicate the issue.

@JayaramRCDAC JayaramRCDAC force-pushed the n2-handover-dl-ran branch 2 times, most recently from d2abfe7 to b4413d0 Compare September 25, 2024 05:29
@thakurajayL thakurajayL merged commit 61c8b31 into omec-project:master Sep 25, 2024
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mbilal92 pushed a commit to mbilal92/amf that referenced this pull request Sep 27, 2024
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3 participants