YD/T 3709-2020 PDF English
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Technical requirements of message layer of LTE-based vehicular communication
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YD/T 3709-2020: Technical requirements of message layer of LTE-based vehicular communication---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/YDT3709-2020
YD
COMMUNICATION INDUSTRY STANDARD
ICS 33.060.30
M30
Technical requirements of message layer of LTE-
based vehicular communication
Issued on. APRIL 16, 2020
Implemented on. JULY 01, 2020
Issued by. Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms, definitions, abbreviations... 5
3.1 Terms and definitions... 5
3.2 Abbreviations... 5
4 Message layer of LTE-based vehicular communication technology... 6
4.1 System introduction... 6
4.2 Architecture of message layer... 7
5 Technical requirements for the message layer... 8
5.1 Basic introduction and requirements of the message layer... 8
5.2 Definition of data set of message layer... 8
Appendix A (Informative) Type and value of DE_EventType (traffic event index)
... 99
1 Scope
This standard specifies the technical requirements for the message layer of
LTE-based vehicular communication technology, which specifically includes the
structure of the data set at message layer AND specific data definitions and
coding methods.
This standard applies to the message layer of the LTE-based wireless
communication technology for vehicular internet.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) is applicable to this standard.
GB 2312-1980 Code of Chinese graphic character set for information
interchange - Primary set
GB 5768.2-2009 Road traffic signs and markings - Part 2.Road traffic signs
GB 14886 Specifications for road traffic signal setting and installation
GB/T 27967-2011 Format of weather forecast on highway traffic
GB/T 29100-2012 Road traffic information service - Traffic event
classification and coding
YD/T 3340-2018 Technical requirements of air interface of LTE-based
vehicular communication
YD/T 3400-2018 General technical requirements of LTE-based vehicular
communication
3 Terms, definitions, abbreviations
3.1 Terms and definitions
The following terms and definitions apply to this document.
3.1.1 Vehicle to everything, V2X
The communication, BETWEEN the on-board unit AND other devices, which
includes, but is not limited to, the communication between the on-board units,
the communication between the on-board unit and the roadside unit, the
communication between the on-board unit and the pedestrian equipment,
the communication between the on-board unit and the network.
3.2 Abbreviations
The following abbreviations apply to this document.
ASN.1.Abstract Syntax Notation One
BSM. Basic Safety Message
DE. Data Element
DF. Data Frame
DSM. Dedicated Short Message
4 Message layer of LTE-based vehicular communication technology
4.1 System introduction
The LTE-based vehicular communication technology realizes the information
interaction, BETWEEN the different subsystems of the intelligent transportation
system, thereby realizing different applications such as road safety, traffic
efficiency, information services.
4.2 Architecture of message layer
The framework of the message layer of the LTE-based vehicular
communication technology is as shown in Figure 3.The message layer is
located inside the application layer, which connects with the data sublayer of
the network layer downwards, AND supports specific user applications upwards.
The message layer can support various data transmissions, which are defined
by the network layer of the LTE-based vehicular communication technology.
5 Technical requirements for the message layer
5.1 Basic introduction and requirements of the message layer
The data set at message layer is defined by the ASN.1 standard. It is formulated
according to the layered nesting logic of "message frame - message body - data
frame - data element".
5.2 Definition of data set of message layer
The data set of message layer, which is defined in this standard, mainly consists
of 1 message frame format, 5 most basic message bodies, corresponding data
frames and data elements, as shown in Figure 4.
5.2.1 Message frame
The message frame is a unified packaging format of a single application layer
message. It is the only operation object for data encoding and decoding. The
message frame is composed of different types of message bodies; it supports
expansion.
5.2.3 Data Frame
The data frame is composed of other data units or data types. It has a specific
practical meaning AND is a component of the message body.
5.2.3.1 DF_AccelerationSet4Way
[Definition]
It defines the four-axis acceleration of the vehicle.
5.2.3.36 DF_Position_-LL-28B
[Definition]
The 28-bit relative latitude and longitude position, which indicates the latitude
and longitude deviation of the current position point, with respect to the
reference position point. It is composed of two 14-bit longitude and latitude
deviation values.
5.2.3.37 DF_Position-LL-32B
[Definition]
The 32-bit relative latitude and longitude position, which indicates the latitude
and longitude deviation of the current position point, with respect to the
reference position point. It consists of two 16-bit longitude and latitude deviation
values.
5.2.3.38 DF_Position-LL-36B
[Definition]
The 36-bit relative longitude and latitude position, which indicates the latitude
and longitude deviation of the current position point, with respect to the
reference position point. It is composed of two 18-bit longitude and latitude
deviation values.
[ASN.1 code]
5.2.4.70 DE_SpeedLimitType
[Definition]
Define the speed limit type; indicate the reference type corresponding to the
given speed limit size.
[ASN.1 code]
5.2.4.71 DE_StabilityControlStatus
[Definition]
Define the state of the vehicle's dynamic stability control system.
Unavailable. The system is not equipped or unavailable.
Off. The system is off.
On. The system is on, but not triggered.
Engaged. The system is triggered and is active.
[ASN.1 code]
5.2.4.72 DE_SteeringWheelAngle
[Definition]
Define the steering wheel angle of the vehicle. To the right is positive; to the left
is negative.
The resolution is 1.5��. The value 127 is invalid value.
[ASN.1 code]
5.2.4.73 DE_SteeringWheelAngleConfidence
[Definition]
Describe the accuracy of the vehicle steering wheel angle, at the 95%
confidence level, in numerical value.
[ASN.1 code]
5.2.4.74 DE_TimeConfidence
[Definition]
Describe the time accuracy, at the 95% confidence level, in numerical value.
The accuracy theoretically only considers the error of the current timing system
itself. However, when the system can automatically detect and correct errors,
the corresponding accuracy values shall also be improved.
[ASN.1 code]
5.2.4.75 DE_TimeMark
[Definition]
Define the time in one hour, in units of 0.1 seconds. It can represent the time in
the current hour, OR it can represent a time period that does not exceed 1 hour
in length.
The resolution is 0.1 second. The valid range is 0 ~ 35999.The value 36000
indicates the length of time, which is greater than 1 hour. The value 36001
indicates an invalid value.
[ASN.1 code]
5.2.4.78 DE_TransmissionState
[Definition]
Vehicle gear status.
5.2.4.79 DE_VehicleEventFlags
[Definition]
Define the special status of a series of vehicles. If a bit of the data is set to 1, it
means that the vehicle is in the state corresponding to that bit. When at least
one corresponding state is activated or restored from the activated state, the
flag value shall be set and interacted.
5.2.4.87 DE_VertOffset-B10
[Definition]
A 10-bit data, which defines the deviation of the vertical direction (Z axis), with
respect to the reference position point. The direction along the Z axis is positive.
The data resolution is 10 cm.
The -512 value indicates an unknown size.
[ASN.1 code]
5.2.4.88 DE_VertOffset-B11
[Definition]
An 11-bit data, which defines the deviation of the vertical direction (Z axis), with
respect to the reference position point. The direction along the Z axis is positive.
The data resolution is 10 cm.
The -1024 value indicates an unknown size.
[ASN.1 code]
5.2.4.89 DE_VertOffset-B12
[Definition]
A 12-bit data, which defines the deviation of the vertical direction (Z axis), with
respect to the reference position point. The direction along the Z axis is positive.
The data resolution is 10 cm.
The -2048 value represents an unknown size.
[ASN.1 code]
5.2.4.90 DE_YawRate
[Definition]
The yaw rate of the vehicle. Refers to the deflection of the car, around the
vertical axis. The magnitude of the deflection represents the stability of the car.
If the deflection angular velocity reaches a threshold, it indicates that dangerous
conditions such as lateral slip or drift have occurred in the car.
Clockwise rotation is positive; counterclockwise is negative.
Data resolution is 0.01��/s.
[ASN.1 code]
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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