PRD (Permanent Reference Document)

A Permanent Reference Document is the GSMA's term for an official binding or recommended specification produced by its working groups. Notable security-relevant PRDs include the FS-series (FS.07, FS.11, FS.19, FS.20, FS.21) covering interconnect and roaming security, IR-series for interconnect and routing, and SG-series for security guidance.

Categories: Core NetworkRoaming and InterconnectProtocols and Standards

PRD 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.

Roaming and interconnect are where two operators exchange signaling and user-plane traffic. Trust boundaries here are the primary attack surface for location tracking, SMS interception and fraud, which is why GSMA now mandates SEPP with PRINS on 5G interconnect.

To place PRD in the wider telecom-security picture, review FS.07, FS.19, GSMA, GSMA Permanent Reference Documents (IR Series), FS.21 and FS.40: each entry cross-references back to this page so you can walk the topic in either direction.

Related terms

Related topic hubs

  • Roaming Security IPX/GRX interconnect risk, home-routed vs local-breakout, SEPP.
  • SS7 Firewall GSMA FS.11 category 1/2/3 SS7 message screening at the STP edge.
  • Diameter Firewall GSMA FS.19 screening at the Diameter Edge Agent on S6a/S9/S13.
  • GTP Firewall GSMA FS.20 GTP-C/GTP-U screening on GRX/IPX borders.

More from the TelcoSec Glossary

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