This part of GB/T 20851 specifies the main parameters, information frames, establishment and revocation of dedicated communication links, and requirements for MAC sublayer and LLC sublayer of the data link layer of dedicated short range communication for electronic toll collection.
This part is applicable to electronic toll collection system for highways and urban roads, and may be used as a reference for automated vehicle identification, vehicle access control, etc.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 7421-2008 Information technology - Telecommunications and information exchange between systems - High-level data link control (HDLC) procedures
GB/T 15629.2-2008 Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Specific requirements - Part 2: Logical link control
GB/T 20839-2007 Intelligent transport systems - General terminology
GB/T 20851.1-2019 Electronic toll collection - Dedicated short range communication - Part 1: Physical layer
3 Terms and definitions
For the purpose of this standard, the terms and definitions given in GB/T 20839-2007 and GB/T 20851.1-2019 apply.
4 Symbols and abbreviations
4.1 Symbols
For the purposes of this document, the following symbols apply.
V(RB): receiving success or failure status variable.
V(RI): receiving sequence status variable.
V(SI): sending sequence status variable.
4.2 Abbreviations
For the purposes of this document, the following abbreviations apply.
ACK: Acknowledge
ACn: Acknowledged Command/Response
BST: Beacon Service Table
C/R: Command/Response
F: Final
GB/T 20851.2-2019 The following standards are cited：
GB/T 20851.2-2019 Cited by the following standards：
