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 is where subscriber sessions, mobility and policy live. 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. Core exposure is the difference between a single-subscriber leak and a fleet-wide breach.
To place PDU Session Modification in the wider telecom-security picture, review PCF, PCRF, PFCP, Rx Interface, PDN and TEID.
Related terms
Related topic hubs
- 5G Security 5G SBA, SEPP, SUCI, 5G-AKA, N32 and service-based interface security.
- 5G NEF Security Network Exposure Function security in the 5G core.
- Diameter Security 4G/LTE Diameter threats across IPX/roaming and DEA defenses.
- 5G Penetration Testing Pentesting the 5G core, SBA, SEPP, and gNB interfaces.
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