JT/T 1458-2023 English PDF (JT/T1458-2023)

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JT/T 1458-2023: Performance requirements and testing approaches of commercial vehicle communication system (V2X) terminal
JT/T 1458-2023
JT
TRANSPORTATION INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 35.100.70
CCS M 35
Performance requirements and testing approaches of
commercial vehicle communication system (V2X) terminal
ISSUED ON: JANUARY 19, 2023
IMPLEMENTED ON: APRIL 19, 2023
Issued by: Ministry of Transport of the People's Republic of China
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Symbols and abbreviations ... 7
5 Composition and application of on board unit ... 7
6 Performance requirements of on-board unit ... 8
7 On-board unit positioning performance test ... 9
8 Communication performance test of on-board unit ... 12
Appendix A (Informative) Data recording and statistics ... 23
References ... 25
Performance requirements and testing approaches of
commercial vehicle communication system (V2X) terminal
1 Scope
This document specifies the composition and application, performance requirements,
positioning performance, communication performance test methods of vehicle-to-
road/vehicle-to-vehicle communication (V2X) terminals for commercial vehicles.
This document applies to vehicle-to-road/vehicle-to-vehicle communication (V2X)
terminals for commercial vehicles, as well as the communication performance and
positioning performance test of such terminal equipment in direct communication of
the Internet of Vehicles (intelligent connected vehicles).
2 Normative references
The contents of the following documents constitute essential clauses of this document
through normative references in the text. Among them, for dated references, only the
version corresponding to that date applies to this document; for undated references, the
latest version (including all amendments) applies to this document.
GB/T 6113.104-2021 Specification for radio disturbance and immunity measuring
apparatus and methods - Part 1-4: Radio disturbance and immunity measuring
apparatus - Antennas and test sites for radiated disturbance measurements
JT/T 1253-2019 GNSS for operating vehicles-Test methods of on-board unit
YD/T 3848-2021 LTE-based vehicle access wireless communication technology
direct connection communication terminal equipment test support
SJ/T 11420-2010 General specification for GPS navigation receiver
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Commercial vehicle
Vehicles that have obtained road transport licenses and are engaged in commercial
4 Symbols and abbreviations
4.1 Symbols
The following symbols apply to this document.
Vmax - Maximum test speed of the vehicle
4.2 Abbreviations
The following abbreviations apply to this document.
AWGN: Additive White Gaussian Noise
GNSS: Global Navigation Satellite System
PDCP: Packet Data Convergence Protocol
QPSK: Quadrature Phase Shift Keying
RB: Resource Block
SDU: Service Data Unit
V2I: Vehicle to Infrastructure
V2V: Vehicle to Vehicle
V2X: Vehicle to Everything
5 Composition and application of on board unit
5.1 Composition
The on board unit shall include at least the following functional units:
a) Radio communication unit: Receiving and sending signals; one or more radio
communication subsystems can be installed in an on-board device;
b) Positioning unit: This unit usually contains a global navigation satellite system
receiver to provide information such as the vehicle's location, direction, speed,
time;
c) Signal processing unit: Run specific programs to process the signals to be sent
and received;
d) Antenna: Used to receive and send RF signals.
The positioning reacquisition time shall be less than 5 s.
6.1.5 Sensitivity
The sensitivity shall meet the following requirements:
a) The acquisition sensitivity is not less than -140 dBm;
b) The tracking sensitivity is not less than -150 dBm.
6.2 Communication performance requirements
6.2.1 Working frequency band
The working frequency band of the on-board unit's direct link communication shall
meet the following requirements:
a) Support working frequency range: 5905 MHz ~ 5925 MHz;
b) Support channel bandwidth: 20 MHz.
6.2.2 Maximum output power
The maximum output power of the on-board unit's direct link is 23 dBm, which has a
tolerance of ±2 dB.
6.2.3 Receiver sensitivity
The working frequency is between 5905 MHz and 5925 MHz; the channel bandwidth
is 20 MHz; it occupies 96 RB; the transmission block size is 6968 bits; it uses single
transmission; the modulation mode is QPSK. Under the AWGN channel conditions,
when the receiving power is -87.5 dBm, the throughput of the on-board unit is not less
than 95% of the maximum throughput of the reference measurement channel.
6.2.4 Reliability
The communication reliability of the on-board unit shall meet the following
requirements:
a) The packet error rate within the safe communication distance shall not exceed
10%;
b) The time delay within the safe communication distance shall not exceed 100 ms.
7 On-board unit positioning performance test
7.1 Test conditions
The RF conditions of the test site meet the RF requirements of the test site specified in
GB/T 6113.104-2021.
7.2 Static positioning accuracy
The test method of static positioning accuracy shall comply with the provisions of
5.4.1.1 of SJ/T 11420-2010.
7.3 Dynamic positioning accuracy
The test method of dynamic positioning accuracy shall comply with the provisions of
7.3.3 of JT/T 1253-2019.
7.4 First positioning time
7.4.1 Cold start time to first fix
The test method for cold start time to first fix is as follows:
a) Clear the short-term ephemeris and the latitude and longitude of the last
positioning temporarily stored in the terminal to be tested; turn off the terminal to
be tested;
b) Determine a set of satellite simulator ephemeris samples;
c) Load the ephemeris samples; adjust the output power of the satellite positioning
simulator to -130 dBm;
d) Cold start the terminal to be tested; start timekeeping, until the terminal is
correctly positioned; record the timing time;
e) It should repeat the above steps for no less than 5 times; take the average value of
the time recorded in step d) as the test result. When selecting the ephemeris
sample in step b), it shall be ensured that the time interval with the previous
ephemeris scene exceeds 4 hours.
7.4.2 Warm start time to first fix
The warm start time to first fix test method is as follows:
a) Clear the short-term ephemeris and the latitude and longitude of the last
positioning temporarily stored in the terminal to be tested;
b) Determine at least 2 sets of satellite simulator ephemeris samples, to ensure that
the time interval between ephemeris scenes exceeds 2 hours;
c) Load the first set of ephemeris samples; adjust the output power of the satellite
positioning simulator to -130 dBm;
a) Load the satellite positioning simulator with a fixed ephemeris sample; adjust the
output power to -165 dBm;
b) Turn on the terminal to be tested;
c) Increase the output power of the satellite positioning simulator by 1 dBm; then
increase it again every 20 seconds, until the positioning is successful;
d) Wait for 60 seconds after the terminal to be tested is successfully positioned;
e) Record the simulator output power value, when the terminal to be tested is
successfully positioned.
7.6.2 Tracking sensitivity
The test method of tracki...