QoS (Quality of Service)

Quality of Service refers to the techniques used to manage and differentiate network resources so that critical traffic meets bandwidth, latency, jitter, and loss targets. In mobile networks, QoS is implemented per bearer (4G QCI) or per QoS flow (5G 5QI) with prioritisation, scheduling, and admission control all the way from the radio interface through the core to external networks.

Categories: Radio Access NetworkCore NetworkOperations and Business

QoS in context

The radio access network is where mobile devices attach to the operator's infrastructure. Attacks in this layer include IMSI catching, rogue base stations and downgrade attacks; defenses rest on mutual authentication, integrity-protected signaling and Open RAN supply-chain hygiene.

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 QoS in the wider telecom-security picture, review DRP, Operating System (OS), 5G, 5G SA, 5G NSA and A5/3 — each entry cross-references back to this page so you can walk the topic in either direction.

Related terms

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.