UDM/PCF-initiated Modify

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N1:
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PDU Session Modification command will be triggered from SMF. It can change Session-AMBR and QoS rules.
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PDU Session Modification Request will be triggered from UE. It can change the QoS rules and maximum number of support-ed packet filters.
In either case, the QoS rule change can happen from the following:
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Packet filter add/delete/replace
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Rule Precedence of QoS Rule
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QoS Parameter – 5QI/MBR/GBR
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N2:
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PDU Session Resource Modify Request will be triggered from SMF. It can change the existing QoS flow that is installed or delete the QoS flow already installed. If the Modify request is received, the parameters - ARP, GBR/MBR, Priority level, and so on, can change.
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PDU Session Resource Notify will be triggered from AN. This happens when certain flow is to be released, not fulfilled any-more and fulfilled again.
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