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GB/T 46922-2025Professional digital trunking communication systems based on 12.5 kHz TDMA channels - Technical specification for system interconnection (English PDF)

基于12.5kHz信道的时分多址（TDMA）专用数字集群通信系统　系统互联技术规范

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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 46922-2025 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　系统互联技术规范.

GB/T 46922-2025 is the Chinese standard "Professional digital trunking communication systems based on 12.5 kHz TDMA channels - Technical specification for system interconnection".

Its scope clause reads: This document specifies the interconnection interface protocol architecture for a dedicated digital trunking communication system based on a 12.5kHz channel for Time Division Multiple Access (TDMA). pSIP syntax, DNS extension specifications, RTP extension specifications, and protocol flow.

This document applies to the design, manufacture, and engineering of a dedicated digital trunking communication system based on a 12.5kHz channel for Time Division Multiple Access (TDMA). acceptance. Its clauses include terms and definitions.

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Document preview — GB/T 46922-2025

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 and Definitions
4.Abbreviations
5.Overall Interconnection Requirements
5.1 Interconnect Architecture
5.2 Interconnection Protocol
5.3 Interconnectivity and Performance Requirements
6.PDT Session Initiation Protocol (pSIP)
6.1 pSIP Protocol Architecture
6.2 pSIP Transaction Layer
6.3 Timer
6.4 Extended BNF Specifications for pSIP
6.5 pSIP messages
6.6 pSDP protocol
6.7 MAP Protocol
6.8 NMEA Protocol
7.Domain Name Service (DNS) Extension Provisions
7.1 PDT System User Domain Name Conversion
7.2 DNS Server Deployment
7.3 DNS Query Mechanism
8.Real-time Transport Protocol (RTP) Extension Specification
8.1 RTP Overview
8.2 RTP Specifications for PDT System Interconnection
9 pSIP Application Layer Interconnection Protocol Flowchart
9.1 Heartbeat Process
9.2 Location Search Process
9.3 Registration/Go to Registration
9.4 One-Call Session Flow
9.5 Group Call Session Flow
9.6 Handover Procedure
9.7 Broadcast Call Process
9.8 All-call process
9.9 SMS Process
9.10 Remote Stun/Remote Death Procedure
9.11 Resurrection Process
9.12 Dynamic Reorganization Process
9.13 Satellite Positioning Data Request Process
Appendix A (Normative) Domain Name Description
Appendix B (Informative) Example 146 of ENMU Transformation Relationship
Appendix C (Informative) DNS Query Example
Appendix D (Informative) Explanation of Message Sequence Diagram
Appendix E (Normative) Table of Provincial Administrative Division Codes of China

1 Scope

This document specifies the interconnection interface protocol architecture for a dedicated digital trunking communication system based on a 12.5kHz channel for Time Division Multiple Access (TDMA).

pSIP syntax, DNS extension specifications, RTP extension specifications, and protocol flow.

This document applies to the design, manufacture, and engineering of a dedicated digital trunking communication system based on a 12.5kHz channel for Time Division Multiple Access (TDMA).

acceptance.

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 2260 Administrative Division Codes of the People's Republic of China

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

YD/T 1522.1 Session Initiation Protocol (SIP) Technical Requirements Part 1.Basic Session Initiation Protocol

YD/T 1936 Session Description Protocol (SDP) Technical Requirements

3 Terms and Definitions

The following terms and definitions apply to this document.

3.1 User Agent

A logical functional entity that supports the SIP protocol acts as a User Account Control (UAC) when generating a request and as a User Account Control (UAS) when receiving a request and generating a response.

3.2 User agent client

The functional entity that sends session requests during the SIP session establishment process.

3.3 User agent server

Functional entities that receive, reject, or forward corresponding session requests during the SIP session establishment process.

3.4 User server

A functional entity that receives requests and sends responses to them.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 155 pages — is available in the English PDF.

Referenced standards

Normative references

Cited by

GB/T 46923-2025Professional digital trunking communication systems based on 12.5 kHz TDMA channels - General technical requirements

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