PDU Session Modification (PDU Session Modification Procedure)

PDU Session Modification (3GPP TS 23.502 §4.3.3) updates parameters of an established 5G PDU Session — QoS Flow addition/removal, 5QI change, session-AMBR update, PCC rules — triggered by the UE, SMF, PCF or AF. Central to dynamic policy control, slicing enforcement and application-triggered QoS via NEF/AF requests.

Categories: Core Network

PDU Session Modification in context

The mobile core carries subscriber sessions, mobility and policy. In 4G it is the EPC (MME, HSS, S/PGW); in 5G it is the Service-Based Architecture with AMF, SMF, UPF, AUSF, UDM and the NRF.

To place PDU Session Modification in the wider telecom-security picture, review 5G, 5G SA, 5G NSA, 5G SBA, ACL and AES — each entry cross-references back to this page so you can walk the topic in either direction.

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