GB/T 47002-2025Specification for the information exchange interface of road traffic management and control facilities (English PDF)

1 Scope

This document specifies the layered structure of the communication network for information exchange between road traffic management and control facilities and roadside units. It defines the exchanged information, message requirements, message frame, safety frame, message bodies, and safety requirements, and describes the corresponding verification methods.

This document is applicable to the design, development, testing, and application of products related to information exchange between road traffic management and control facilities and roadside units.

2 Normative References

The contents of the following documents constitute indispensable clauses of this document through normative references in the text. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document.

GB/T 2260 Codes for the administrative divisions of the People's Republic of China

GB/T 16262.1 Information technology - Abstract Syntax Notation One (ASN.1) - Part 1. Specification of basic notation

GB/T 16262.2 Information technology - Abstract Syntax Notation One (ASN.1) - Part 2. Information object specification

GB/T 31418 Terminology of road traffic signal control system

GB/T 46999 General specifications for digital identity and authentication of road traffic management and control facilities

GA/T 1743-2020 Specifications for the information release interface of traffic signal controller

YD/T 3709-2020 Technical requirements of message layer of LTE-based vehicular communication

YD/T 3957-2021 LTE-based vehicular communication - Technical requirement of security certificate management system

3 Terms and Definitions

The terms and definitions defined in GB/T 31418 and the following ones are applicable to this document.

4 Abbreviations

The following abbreviations are applicable to this document.

ASN.1: Abstract Syntax Notation One

BASE-T: Broadband Attachment Standard Ethernet-Twisted Pair

BSM: Basic Safety Message

DE: Data Element

DF: Data Frame

IP: Internet Protocol

TCP: Transmission Control Protocol

UDP: User Datagram Protocol

UPER: Unaligned Packed Encoding Rules

UTC: Universal Time Coordinated

V2X: Vehicle to Everything

5 General Communication Principles

The information exchange interface used by road traffic management and control facilities (hereinafter referred to as the "information exchange interface") shall conduct end-to-end communication with roadside units. The network layered structure for these communication applications is illustrated in Figure 1; specific provisions are as follows:

a) Physical layer: An Ethernet interface is recommended, supporting at least 100/1 000 BASE-T full-duplex communication;

b) Network layer and transport layer: The network layer should utilize the IP protocol, while the transport layer should utilize either the UDP or TCP protocol;

c) Application layer: Custom-defined messages shall be employed to encapsulate the exchanged information; message requirements shall comply with the provisions of Clause 7.

6 Exchanged Information

The information exchanged by road traffic management and control facilities primarily comprises the dissemination of digitized traffic command and dispatch information - such as crossing lane functions, signal lamp group color status, and lane control signals - as well as the reception of basic vehicle operational safety information. Specific requirements shall comply with the provisions of Table 1.

7 Message Requirements