YD/T 3695-2020 PDF English
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YD/T 3695-2020: Vehicle Emergency Alarm System Based on Public Telecommunication Network Wireless Data Transmission Technology Requirements
---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/YDT3695-2020
YD
COMMUNICATIONS INDUSTRY STANDARD
ICS 33.060.99
M36
Vehicle Emergency Alarm System Based on Public
Telecommunication Network Wireless Data Transmission
Technology Requirements
Issued on. APRIL 16, 2020
Implemented on. JULY 01, 2020
Issued by. Ministry of Industry and Information Technology of the People's
Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms, definitions and abbreviations... 6
3.1 Terms and definitions... 6
3.2 Abbreviations... 7
4 Overviews... 8
4.1 Overview of eCall system... 8
4.2 eCall system requirements... 8
4.3 eCall in-band modulation architecture... 10
5 Functional description of IVS data modem... 13
5.1 IVS transmitter... 13
5.2 IVS receiver... 21
6 Functional description of data modem... 24
6.1 PSAP transmitter... 24
6.2 PSAP receiver... 29
7 Transport protocols and error handling... 32
7.1 Normal operation... 32
7.2 Abnormal operation... 32
7.3 PSAP and IVS protocol state model... 36
Annex A (informative) eCall performance requirements/goals and design constraints
... 39
1 Scope
This Standard specifies the technical requirements for communication and data
transmission of the vehicle emergency alarm system based on public
telecommunication network, namely the overall scheme and algorithm description of
eCall in-band modulation, including the IVS modem and PSAP modem that constitute
full-duplex transmission.
This Standard applies to vehicle emergency alarm systems based on public
telecommunication network.
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.
3GPPTS 22.101, Service aspects; Service principles
3GPP TR 22.967, Transfer of ECall Data
3GPP TS 26.071, AMR speech Codec; General description
3GPP TS 26.094, Mandatory speech codec speech processing functions; Adaptive
Multi-Rate (AMR) speech codec; Voice Activity Detector (VAD)
3GPP TS 26.226, Cellular text telephone modem; General description
3GPP TS 26.268, eCall Data Transfer; In-band modem solution· ANSI-C reference
code
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.6 MSD data frame
It includes the uplink signal transmission time of one MSD data (after synchronization
is established). The duration is 1320 ms. This is equivalent to a total of 10560 samples
at 8kHz sampling rate (if a fast modulator is used) or 18560 samples (if a reliable
modulator is used).
3.1.7 modulation frame
Symbol transmission time. The duration is 2 ms, equivalent to 16 samples at 8kHz
sampling rate (if a fast modulator is used), or 4 ms, equivalent to 32 samples at 8kHz
sampling rate (if a reliable modulator is used).
3.1.8 synchronization frame
It includes the signal transmission time of synchronization information. The duration is
260 ms. This is equivalent to 2080 samples at a sampling rate of 8 kHz.
3.2 Abbreviations
The following abbreviations apply to this document.
4 Overviews
4.1 Overview of eCall system
Figure 1 gives an overall description of the eCall system.
4.3 eCall in-band modulation architecture
4.3.1 General
The eCall in-band modulation scheme specified in this Standard consists of an IVS data
modem and a PSAP data modem. The signal design used allows the signal to pass
through the voice vocoder with only moderate distortion and provide sufficient data rate
to meet the requirements of transmitting MSD as quickly as possible.
4.3.2 IVS data modem working principle
Figure 3 shows the basic components of an IVS data modem. The MSD information
input to the IVS transmitter is first added with CRC check information, and then all bits
are input to the HARQ encoder. FEC coding is used to combat transmission errors.
5 Functional description of IVS data modem
5.1 IVS transmitter
5.1.1 General
The IVS transmitter is used to modulate the MSD data so that it is suitable for in-band
transmission over the voice channel to the PSAP. The components of the IVS
transmitter are shown in Figure 5.
5.1.3 CRC check code
Each MSD message is preceded by a 28-bit CRC checksum before HARQ FEC
encoding.
5.1.4 HARQ FEC encoder
5.1.4.1 Bit scrambling
Bit scrambling is performed on the MSD information after the CRC check is added
(before Turbo encoding).
5.1.4.2 Turbo coding
The Turbo encoder scheme used in eCall intra-band modulation consists of two
identical 8-state parallel-concatenated convolutional coding (PCCC) sub-encoders and
a Turbo code intra-interleaver. The transfer function of the sub-encoder is.
Table 2 -- MSD data frame format
5.1.7 Synchronization signal and frame format
The synchronization frame is composed of the following two parts in series.
5.2.6 Message processing
This function activates the corresponding function of the IVS modem according to the
received message. After synchronization lock, once a START message is received, the
IVS transmitter is activated for MSD transmission.
6 Functional description of data modem
6.1 PSAP transmitter
6.1.1 General
The PSAP transmitter generates downlink transmission signals. These downlink signals
are used to control the transmission of uplink MSD. The PSAP transmitter is shown in
Figure 15.
6.1.2 Message encoding
According to the design, the PSAP transmitter can send a total of 16 different link layer
messages to the IVS. The following three are currently used.
6.1.3 BCH coding
The link layer feedback uses a truncated (60, 4) BCH block code. This code is generated
from the (63, 7) BCH block code. See Table 4 for different messages and their encoding
methods.
6.1.5.2 High-level confirmation feedback message
The feedback frame in the high-level feedback message (see 5.1.7) needs to be inverted
(i.e. all samples are multiplied by -1). Its frame structure contains two DL-Data fields
and a silent interval.
6.1.5.3 Downlink message processing
Before detecting the uplink synchronization frame, the PSAP transmitter
sends/retransmits the START message multiple times.
6.1.6 Synchronization
The PSAP synchronization signal is similar to that described in 5.1.7, except that the
PN sequence pulse amplitude is increased by 5000, that is, its pulse amplitude is 25000
and -15000, and the original zero is replaced by a sample with an amplitude of 12000.
For high-level confirmation messages, the above synchronization frame needs to be
inverted, that is, each sample is multiplied by -1.
6.2 PSAP receiver
6.2.1 General
The PSAP receiver demodulates the MSD message from the IVS and checks the
integrity of the received MSD through CRC check. The block diagram of the PSAP
receiver is shown in Figure 17.
7 Transport protocols and error handling
7.1 Normal operation
The previous sections describe the eCall data transmission operation under normal
circumstances.
7.2 Abnormal operation
This section describes some abnormal situations that occur due to severe signal
distortion caused by the transmission channel. These situations need to be handled by
the overall transmission protocol to avoid deadlock situations. It shall be noted that the
abnormal situations described here are not mutually exclusive.
YD/T 3695-2020
YD
COMMUNICATIONS INDUSTRY STANDARD
ICS 33.060.99
M36
Vehicle Emergency Alarm System Based on Public
Telecommunication Network Wireless Data Transmission
Technology Requirements
Issued on. APRIL 16, 2020
Implemented on. JULY 01, 2020
Issued by. Ministry of Industry and Information Technology of the People's
Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms, definitions and abbreviations... 6
3.1 Terms and definitions... 6
3.2 Abbreviations... 7
4 Overviews... 8
4.1 Overview of eCall system... 8
4.2 eCall system requirements... 8
4.3 eCall in-band modulation architecture... 10
5 Functional description of IVS data modem... 13
5.1 IVS transmitter... 13
5.2 IVS receiver... 21
6 Functional description of data modem... 24
6.1 PSAP transmitter... 24
6.2 PSAP receiver... 29
7 Transport protocols and error handling... 32
7.1 Normal operation... 32
7.2 Abnormal operation... 32
7.3 PSAP and IVS protocol state model... 36
Annex A (informative) eCall performance requirements/goals and design constraints
... 39
1 Scope
This Standard specifies the technical requirements for communication and data
transmission of the vehicle emergency alarm system based on public
telecommunication network, namely the overall scheme and algorithm description of
eCall in-band modulation, including the IVS modem and PSAP modem that constitute
full-duplex transmission.
This Standard applies to vehicle emergency alarm systems based on public
telecommunication network.
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.
3GPPTS 22.101, Service aspects; Service principles
3GPP TR 22.967, Transfer of ECall Data
3GPP TS 26.071, AMR speech Codec; General description
3GPP TS 26.094, Mandatory speech codec speech processing functions; Adaptive
Multi-Rate (AMR) speech codec; Voice Activity Detector (VAD)
3GPP TS 26.226, Cellular text telephone modem; General description
3GPP TS 26.268, eCall Data Transfer; In-band modem solution· ANSI-C reference
code
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.6 MSD data frame
It includes the uplink signal transmission time of one MSD data (after synchronization
is established). The duration is 1320 ms. This is equivalent to a total of 10560 samples
at 8kHz sampling rate (if a fast modulator is used) or 18560 samples (if a reliable
modulator is used).
3.1.7 modulation frame
Symbol transmission time. The duration is 2 ms, equivalent to 16 samples at 8kHz
sampling rate (if a fast modulator is used), or 4 ms, equivalent to 32 samples at 8kHz
sampling rate (if a reliable modulator is used).
3.1.8 synchronization frame
It includes the signal transmission time of synchronization information. The duration is
260 ms. This is equivalent to 2080 samples at a sampling rate of 8 kHz.
3.2 Abbreviations
The following abbreviations apply to this document.
4 Overviews
4.1 Overview of eCall system
Figure 1 gives an overall description of the eCall system.
4.3 eCall in-band modulation architecture
4.3.1 General
The eCall in-band modulation scheme specified in this Standard consists of an IVS data
modem and a PSAP data modem. The signal design used allows the signal to pass
through the voice vocoder with only moderate distortion and provide sufficient data rate
to meet the requirements of transmitting MSD as quickly as possible.
4.3.2 IVS data modem working principle
Figure 3 shows the basic components of an IVS data modem. The MSD information
input to the IVS transmitter is first added with CRC check information, and then all bits
are input to the HARQ encoder. FEC coding is used to combat transmission errors.
5 Functional description of IVS data modem
5.1 IVS transmitter
5.1.1 General
The IVS transmitter is used to modulate the MSD data so that it is suitable for in-band
transmission over the voice channel to the PSAP. The components of the IVS
transmitter are shown in Figure 5.
5.1.3 CRC check code
Each MSD message is preceded by a 28-bit CRC checksum before HARQ FEC
encoding.
5.1.4 HARQ FEC encoder
5.1.4.1 Bit scrambling
Bit scrambling is performed on the MSD information after the CRC check is added
(before Turbo encoding).
5.1.4.2 Turbo coding
The Turbo encoder scheme used in eCall intra-band modulation consists of two
identical 8-state parallel-concatenated convolutional coding (PCCC) sub-encoders and
a Turbo code intra-interleaver. The transfer function of the sub-encoder is.
Table 2 -- MSD data frame format
5.1.7 Synchronization signal and frame format
The synchronization frame is composed of the following two parts in series.
5.2.6 Message processing
This function activates the corresponding function of the IVS modem according to the
received message. After synchronization lock, once a START message is received, the
IVS transmitter is activated for MSD transmission.
6 Functional description of data modem
6.1 PSAP transmitter
6.1.1 General
The PSAP transmitter generates downlink transmission signals. These downlink signals
are used to control the transmission of uplink MSD. The PSAP transmitter is shown in
Figure 15.
6.1.2 Message encoding
According to the design, the PSAP transmitter can send a total of 16 different link layer
messages to the IVS. The following three are currently used.
6.1.3 BCH coding
The link layer feedback uses a truncated (60, 4) BCH block code. This code is generated
from the (63, 7) BCH block code. See Table 4 for different messages and their encoding
methods.
6.1.5.2 High-level confirmation feedback message
The feedback frame in the high-level feedback message (see 5.1.7) needs to be inverted
(i.e. all samples are multiplied by -1). Its frame structure contains two DL-Data fields
and a silent interval.
6.1.5.3 Downlink message processing
Before detecting the uplink synchronization frame, the PSAP transmitter
sends/retransmits the START message multiple times.
6.1.6 Synchronization
The PSAP synchronization signal is similar to that described in 5.1.7, except that the
PN sequence pulse amplitude is increased by 5000, that is, its pulse amplitude is 25000
and -15000, and the original zero is replaced by a sample with an amplitude of 12000.
For high-level confirmation messages, the above synchronization frame needs to be
inverted, that is, each sample is multiplied by -1.
6.2 PSAP receiver
6.2.1 General
The PSAP receiver demodulates the MSD message from the IVS and checks the
integrity of the received MSD through CRC check. The block diagram of the PSAP
receiver is shown in Figure 17.
7 Transport protocols and error handling
7.1 Normal operation
The previous sections describe the eCall data transmission operation under normal
circumstances.
7.2 Abnormal operation
This section describes some abnormal situations that occur due to severe signal
distortion caused by the transmission channel. These situations need to be handled by
the overall transmission protocol to avoid deadlock situations. It shall be noted that the
abnormal situations described here are not mutually exclusive.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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