Supported Scenarios
Path switch request is supported for:
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Single PDU resource
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Multiple PDU resources
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Multiple, with some failed to handover at the target gNB
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Multiple, with some failing at the SMF
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Requests timing out at the SMF
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Expiry of guard timer
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Error conditions at the SMF: handling of the error and sending the right errors so that resources are cleared at the UE
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Error condition at the AMF: If invalid Session ID comes in Path Switch Request Ack, in either ToBeSwithched or FailedToSetup, AMF sends Path Switch Request Failure with Unknown Session ID as the cause.
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If SMF rejects all PDUs, then AMF sends Path Switch Request Failure with cause as HO-Failure-in-target-5GC-ngran-node-or-target-system.