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 PCF, PFCP, Rx Interface, PDN, TEID and BSF: each entry cross-references back to this page so you can walk the topic in either direction.
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.
More from the TelcoSec Glossary
Browse the full TelcoSec Glossary, the Ultimate Guide to Mobile Network Security, or the P1 Arsenal of telecom-security tools.