GB/T 28787-2023
Data communication protocol between intelligent terminals on urban buses and trams and dispatching center (English Version)
- Standard No.
- GB/T 28787-2023
- Language
- Chinese, Available in English version
- Release Date
- 2023
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Latest
- GB/T 28787-2023
- Replace
- GB/T 28787-2012
- Scope
- This document specifies the protocol basis, communication connection, message processing and data format for data communication between the on-board intelligent terminal of urban public buses and trams and the dispatching center. This document is applicable to data communication between the on-board intelligent terminal of urban public buses and trams and the dispatching center through wireless transmission channels.
- Introduction
Standard Evolution and Technological Change
Version Major Changes Affected Areas GB/T 28787-2012 Semantic/Syntax Frame Structure, Data Frame Requirements Basic Communication Architecture GB/T 28787-2023 New Protocol Basics, Message Processing, Extended Data Types Intelligent Scheduling System
Core Architecture Analysis
Communication Protocol Layered Model
- Transport layer: TCP connection is used by default
- Message layer: Contains 58 types of standard messages (compatible with JT/T808)
- Data layer: Extended SBYTE/SWORD/SDWORD data types
Key Technology Innovations
Technical Modules New Functions Application Scenarios Smart Terminal Management Upgrade Task Numbering Mechanism (Table 2) Remote Firmware Upgrade Active Safety Warning 16 Warning Types (Table 8) Driving behavior monitoring Major station assessment Dynamic configuration of time and space thresholds (Table 51-52) Operation punctuality management
Implementation suggestions
System upgrade path
- Terminal compatibility test: focus on verifying the extended data type processing capability of the on-board intelligent terminal
- Communication stress test: It is recommended that the message processing throughput ≥500msg/s
- Security reinforcement: Use RSA encryption (Clause 7.1.34-35)
Typical problem solutions
Problem phenomenon Troubleshooting steps Unreported arrival and departure information Check the positioning status of flag field bit2 (Table 19) Video transmission interruption Verify independent link of audio and video streams (Clause 6.4)
Industry application case
Intelligent dispatch system
Qingdao Public Transport Group adopts this standard to achieve:
- Vehicle arrival prediction accuracy increased to 92%
- Emergency dispatch response time shortened by 40%
- Optimize the frequency density through passenger flow information collection (7.2.4)
GB/T 28787-2023 Referenced Document
- GB/T 32852.1-2016 Terminology for urban passenger transport - Part 1: General terms
GB/T 28787-2023 history
- 2023 GB/T 28787-2023 Data communication protocol between intelligent terminals on urban buses and trams and dispatching center
- 2012 GB/T 28787-2012 Data communication protocol between on-board information terminal of urban public transit dispatching and control center