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GB/T 46920-2025Professional digital trunking communication systems based on 12.5 kHz TDMA channels - Technical requirements for security (English PDF)

基于12.5kHz信道的时分多址（TDMA）专用数字集群通信系统　安全技术要求

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

December 31, 2025

Implementation date

April 1, 2026

Scope

GB/T 46920-2025 is the English-translated version of 基于12.5kHz信道的时分多址（TDMA）专用数字集群通信系统　安全技术要求.

GB/T 46920-2025 is the Chinese standard "Professional digital trunking communication systems based on 12.5 kHz TDMA channels - Technical requirements for security".

Its scope clause reads: This document specifies the security measures for use in dedicated digital trunking communication systems based on a 12.5kHz channel for Time Division Multiple Access (TDMA).

This requirement includes technical requirements for two-way authentication, air interface security, and end-to-end security. This document applies to the security encryption functions of a dedicated digital trunking communication system based on a 12.5kHz channel for Time Division Multiple Access (TDMA).

Design and development. Its clauses include terms, definitions and abbreviations.

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Document preview — GB/T 46920-2025

National Standard of the People's Republic of China

ICS: 33.060.01
Classification: M 36

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
1.Scope
2 Normative References
3.Terms, Definitions, and Abbreviations
3.1 Terms and Definitions
3.2 Abbreviations
4.Basic Requirements
4.1 Security System Architecture
4.2 Security Mechanisms
5.Two-way authentication
5.1 Authentication Requirements
5.2 Authentication Parameters
5.3 Authentication Cryptographic Algorithm
5.4 Basic Business Processes
5.5 Signaling Flow
5.6 Signaling Format
6.Air interface security
6.1 Overview
6.2 Air Interface Key
6.3 Air-to-ground cryptography algorithm
6.4 Key Relationship
6.5 Air Interface Encryption
6.6 Air Interface Integrity Protection
6.7 Air Interface Key Management
7.End-to-end security
7.1 End-to-end voice encryption
7.2 End-to-End Data Security
Appendix A (Informative) MSC Figure

1 Scope

This document specifies the security measures for use in dedicated digital trunking communication systems based on a 12.5kHz channel for Time Division Multiple Access (TDMA).

This requirement includes technical requirements for two-way authentication, air interface security, and end-to-end security.

This document applies to the security encryption functions of a dedicated digital trunking communication system based on a 12.5kHz channel for Time Division Multiple Access (TDMA).

Design and development.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 34991 Air Interface Physical Layer of Dedicated Digital Trunking Communication System Based on Time Division Multiple Access (TDMA) Channel (12.5kHz) and data link layer technical specifications

GB/T 34992 Air Interface Call Control for Dedicated Digital Trunking Communication System Based on 12.5kHz Channel Time Division Multiple Access (TDMA)

Layering Technical Specifications

GB/T 46923 General Technical Requirements for Dedicated Digital Trunking Communication Systems Based on Time Division Multiple Access (TDMA) Channels (12.5kHz)

3 Terms, Definitions and Abbreviations

3.1 Terms and Definitions

The terms and definitions defined in GB/T 46923, GB/T 34991 and GB/T 34992, as well as the following terms and definitions, apply to this document.

3.1.1 Authentication

The process of verifying the legitimacy of the identities of the participants in a communication.

3.1.2 stun

The process of temporarily disabling a mobile station using air interface signaling.

3.1.3 Revive

The process of using air communication to deactivate a remotely stunned mobile station.

3.1.4 remotely killed

The process of permanently disabling a mobile station using air interface signaling means that the mobile station cannot be unblocked via air interface signaling.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 40 pages — is available in the English PDF.

Referenced standards

Normative references

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