This part of GB/T 20851 specifies the basic requirements of the physical layers used for dedicated short range communication of electronic toll collection and technical requirements for the downlink and uplink.
This part is applicable to electronic toll collection system for highways and urban roads, and may be used as a reference for fields of automated vehicle identification, vehicle access control system, 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 9410-2008 General specification for antennas used in the mobile communications
GB/T 13622-2012 Terminology for radio regulation
GB/T 14733.7-2008 Terminology for telecommunication - Oscillations, signals and related devices
GB/T 14733.9-2008 Terminology for telecommunication - Radio wave propagation
GB/T 20839-2007 Intelligent transport systems - General terminology
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 9410-2008, GB/T 13622-2012, GB/T 14733.7-2008, GB/T 14733.9-2008, and GB/T 20839-2007 and the following apply.
3.1
wakeup
the process by which an on-board unit (OBU) transits from a dormant state to an operating state
3.2
preamble
the presignal of the physical layer frame information which is independent from the link layer and may be a modulated or unmodulated carrier
3.3
post-amble
The postsignal of the physical layer frame information which is independent from the link layer and may be a modulated or unmodulated carrier
GB/T 20851.1-2019 The following standards are cited：
GB/T 20851.1-2019 Cited by the following standards：
