Service Request (5G) (5G Service Request Procedure)
The 5G Service Request procedure (3GPP TS 23.502 §4.2.3) is initiated by the UE in CM-IDLE — or by the network via paging — to establish user-plane resources for one or more PDU Sessions and re-activate the N2/N3 tunnels on the AMF and UPF. It is the main state transition between CM-IDLE and CM-CONNECTED and a key measurement point for signaling load.
Categories: Core Network
Service Request (5G) 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 Service Request (5G) in the wider telecom-security picture, review PGW, SC, SCP Abuse, SRVCC, N6 and N3.
Related terms
Related topic hubs
- 5G Security 5G SBA, SEPP, SUCI, 5G-AKA, N32 and service-based interface security.
- Diameter Security 4G/LTE Diameter threats across IPX/roaming and DEA defenses.
- Signaling Firewall Unified SS7/Diameter/GTP/SMS signaling firewall framework.
- 5G NEF Security Network Exposure Function security in the 5G core.
More from the TelcoSec Glossary
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