ECall method based on CAT1 technology

Abstract

The invention provides an eCall method based on a CAT1 technology, and relates to the technical field of Internet of Vehicles. The method comprises the following steps: when the microprocessor judges that an emergency occurs in a vehicle, the microprocessor notifies a CAT1 communication module to dial an emergency rescue call according to a UART / SPI communication protocol; the CAT1 communication module searches an optimal LTE network and establishes IMS registration, so that the CAT1 communication module can carry out VoLTE conversation; the CAT1 communication module receives vehicle position information through the satellite positioning antenna and sends the vehicle position information to the microprocessor, and the microprocessor generates minimum data set MSD data according to the vehicle position information; the CAT1 communication module is connected with a WAN antenna through a WAN antenna interface, is connected to an LTE CAT1 network through the WAN antenna, sends MSD data to an emergency rescue center through the LTE CAT1 network, dials an emergency number through VoLTE, and establishes voice communication with the emergency rescue center. The advantage of high cost performance of the CAT1 communication module is utilized, a more reliable and more advanced vehicle emergency communication function is provided, meanwhile, efficient utilization of resources is achieved, and cost is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the Internet of Vehicles technology field, in particular to an eCall method based on CAT1 technology. BACKGROUND

[0002] With the global communication technology evolving to 4G / 5G, many countries and regions have begun to gradually close 2G / 3G networks, which poses a challenge to the eCall (emergency call) system relying on traditional cellular networks.

[0003] NG-eCall (Next Generation eCall) is an upgraded emergency call system that uses 4G / 5G and IP communication technology to replace the existing eCall technology and provide more reliable and advanced vehicle emergency communication functions. However, the upload rate of the CAT4 communication module can reach 50 Mbps, which is excessive for NG-eCall and cannot achieve efficient use of resources, thereby increasing costs. SUMMARY

[0004] The purpose of the application is to provide an eCall method based on CAT1 technology, which uses the cost-effective advantage of the CAT1 communication module to replace the existing emergency call method and provide more reliable and advanced vehicle emergency communication functions.

[0005] The application provides an eCall method based on CAT1 technology for an NG-eCall vehicle terminal, wherein the vehicle terminal comprises a microprocessor and a CAT1 communication module, and the method comprises the following steps:

[0006] The microprocessor determines whether an emergency situation occurs in the vehicle;

[0007] When the microprocessor determines that an emergency situation occurs in the vehicle, the microprocessor notifies the CAT1 communication module to dial an emergency rescue phone according to the UART / SPI communication protocol;

[0008] The CAT1 communication module searches for the optimal LTE network, establishes IMS registration, and enables the CAT1 communication module to make VoLTE calls;

[0009] The CAT1 communication module receives vehicle location information through a satellite positioning antenna and sends the vehicle location information to the microprocessor, and the microprocessor generates MSD data according to the vehicle location information;

[0010] The CAT1 communication module is connected with a WAN antenna through a WAN antenna interface, connected to an LTE CAT1 network through the WAN antenna, sends the MSD data to an emergency rescue center through the LTE CAT1 network, and dials an emergency number using VoLTE to establish a voice call with the emergency rescue center.

[0011] In a possible implementation, the microprocessor determines whether the vehicle is in an emergency situation, including:

[0012] The microprocessor receives an emergency rescue trigger signal sent by the in-vehicle CAN network and determines that the vehicle is in an emergency situation.

[0013] and / or,

[0014] The microprocessor receives an airbag trigger signal and determines that the vehicle is in an emergency situation.

[0015] and / or,

[0016] The microprocessor receives an emergency rescue button trigger signal and determines that the vehicle is in an emergency situation.

[0017] In a possible implementation, the MSD data includes at least one of vehicle location information, driving direction, accident occurrence time, accident severity, and passenger number.

[0018] In a possible implementation, the method further includes:

[0019] After hanging up the phone, when the emergency rescue center dials back, the CAT1 communication module receives a voice call request through the LTE CAT1 network;

[0020] The CAT1 communication module sends the voice call request to the microprocessor;

[0021] After the microprocessor receives the voice call request sent by the CAT1 communication module, the microprocessor establishes a voice call with the emergency rescue center through the

[0022] The UART communication protocol informs the CAT1 communication module to answer the call from the emergency rescue center, and the CAT1 communication module establishes a voice call with the emergency rescue center through the LTE CAT1 network.

[0023] In a possible implementation, the method further includes:

[0024] The microprocessor encrypts the MSD data through a preset encryption algorithm and sends the encrypted MSD data to the emergency rescue center.

[0025] In a possible implementation manner, the preset encryption algorithm includes at least one of a symmetric encryption algorithm SM4, an asymmetric encryption algorithm SM2, and a digest encryption algorithm SM3.

[0026] Compared with the prior art, the eCall method based on the CAT1 technology provided in the application is used for an NG-ECALL vehicle terminal, and the vehicle terminal includes a microprocessor and a CAT1 communication module. The microprocessor judges whether an emergency situation occurs in a vehicle. When the microprocessor judges that the emergency situation occurs in the vehicle, the microprocessor informs the CAT1 communication module to dial an emergency rescue phone number according to a UART / SPI communication protocol. The CAT1 communication module searches for an optimal LTE network, establishes IMS registration, and enables the CAT1 communication module to perform VoLTE call. The CAT1 communication module receives vehicle position information through a satellite positioning antenna, and sends the vehicle position information to the microprocessor. The microprocessor generates minimum data set (MSD) data according to the vehicle position information. The CAT1 communication module is connected with a WAN antenna through a WAN antenna interface, is connected to an LTE CAT1 network through the WAN antenna, sends the MSD data to an emergency rescue center through the LTE CAT1 network, and dials an emergency number using VoLTE to establish voice call with the emergency rescue center. Compared with the prior art, the application uses the advantage of high cost performance of the CAT1 communication module to replace the existing emergency call method, and provides more reliable and more advanced vehicle emergency communication function. Meanwhile, efficient use of resources is achieved, and cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0027] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of preferred embodiments, and are not meant to limit the present application. Furthermore, the same reference numerals are used throughout the several drawings to refer to the same or like parts. In the drawings:

[0028] Figure 1 A structure schematic diagram of an NG-eCall TBOX terminal based on the CAT1 technology is shown;

[0029] Figure 2 A flowchart for implementing eCall voice call in the eCall method based on the CAT1 technology is shown;

[0030] Figure 3 A flowchart for implementing emergency rescue center callback in the eCall method based on the CAT1 technology is shown;

[0031] Figure 4A flowchart of a specific TBOX terminal implementing eCall voice call and callback is shown.

[0032] Figure 5 A circuit diagram of a TBOX terminal is shown. DETAILED DESCRIPTION

[0033] Exemplary embodiments of the present disclosure will be described below in greater detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it is to be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0034] It should be noted that the technical terms or scientific terms used in the present application should be understood in their ordinary sense by those skilled in the art unless otherwise specified.

[0035] In addition, the terms "first" and "second" and the like are used to distinguish different objects, and are not intended to describe a particular order. Furthermore, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can optionally include other steps or units not listed or can optionally include other steps or units inherent to such processes, methods, products or devices.

[0036] Nomenclature of the present application:

[0037] 1. CAT1 and CAT4 are both standards for user terminal categories under 4G communication LTE network, used to measure the wireless performance of user terminal devices, mainly according to the terminal communication rate.

[0038] CAT1: full name is LTE UE-Category 1, can be called "low version" 4G terminal. Its uplink peak rate is 5Mbit / s, and downlink peak rate is 10Mbit / s, belonging to cellular Internet of Things, which is a wide area network. The goal of CAT1 is to serve the Internet of Things and realize low-power and low-cost LTE connection. It is suitable for scenarios that do not require high broadband rate, but have certain requirements for power consumption and data transmission stability, such as wearable devices, smart home appliances, industrial sensors, port logistics tracking, shared payment, etc.

[0039] CAT4: Full name is LTE UE-Category 4. Its downlink peak rate can reach about 150Mbit / s, and the uplink peak rate is usually about 50Mbit / s. CAT4 can meet the communication needs of mobile broadband, and is suitable for scenarios with higher requirements for broadband rate and stability, but relatively insensitive to cost and power consumption, such as vehicle networking, smart grid, 4G wireless routing, video security, commercial display equipment, 4G law enforcement instrument, video live broadcast equipment, etc.

[0040] In general, CAT1 has the advantages of low cost and low power consumption, and is suitable for a large number of low-speed application scenarios in the Internet of Things; while CAT4 is characterized by high speed, and is mainly applied to scenarios with high requirements for data transmission speed.

[0041] 2、UART: UART is a kind of general serial data bus, which is used for asynchronous communication. The bus can communicate in both directions, and can realize full-duplex transmission and reception. In the TBOX, it is used for data and instruction transmission between the 4G CAT1 module and the MCU.

[0042]

[0043] 3、I2C: I2C bus is a simple, bidirectional two-wire synchronous serial bus. It only needs two lines to transmit information between devices connected to the bus. In the TBOX, it is used for data and instruction transmission between the 4G CAT1 module and the MCU.

[0044] 4、SPI: SPI is the abbreviation of Serial Peripheral Interface, which is a high-speed, full-duplex, synchronous communication bus, and only occupies four lines on the chip pins, saving chip pins.

[0045] 5、VoLTE: VOLTE is the full name of Voice over Long-Term Evolution (Long-Term Evolution Voice), which means a high-speed wireless communication standard for mobile phones and data terminals. It is based on the IP Multimedia Subsystem (IMS) network, and uses a specially designed configuration file for the control layer and the media layer of the voice service on LTE, which enables voice services to be transmitted as data streams in the LTE data bearer network, rather than maintaining and relying on traditional circuit switched voice networks.

[0046] ​Since the upload rate of the CAT4 communication module can reach 50Mbps, the upload rate is excessive for NG-eCall, and the efficient use of resources cannot be achieved, which invisibly increases the cost. The present inventor finds that the upload rate of the CAT1 communication module is 5Mbps, which fully meets the requirements of NG-eCall information upload and the vehicle-mounted mobile scene. CAT1 shows excellent cost performance in NG-eCall application, and is particularly suitable for large-scale commercial vehicle fleets and entry-level passenger vehicle markets. With further optimization of the voice performance of CAT1 by 3GPP R14, it is expected to become the mainstream eCall communication scheme in the future. Therefore, an NG-eCall TBOX terminal based on CAT1 technology emerges as the times require. TBOX is the abbreviation of vehicle-mounted telematics terminal, and is one of the core components in the Internet of Vehicles system, mainly used for realizing data interaction and communication functions between the vehicle and the outside world (such as cloud servers, mobile phone APPs, base stations, etc.).

[0047] Please refer to Figure 1 , Figure 1 is a structure schematic diagram of an NG-eCall TBOX terminal based on CAT1 technology provided by the present embodiment, and the terminal comprises a microprocessor, a power management module, a built-in backup battery module, a CAT1 communication module, a CAN module and other functional modules.

[0048] The microprocessor is in communication connection with each functional module in the terminal, and is used for data processing, communication coordination and fault management of each functional module.

[0049] The microcontroller (MCU, Microcontroller Unit) is a "microcomputer" integrating CPU, memory (RAM / Flash), timer, I / O interface (GPIO, SPI, I2C), ADC / DAC converter, etc. in a single chip. In the vehicle-mounted terminal, the microcontroller is the core computing unit, which is used for management and control of each functional module in the terminal, self-test of each function in the terminal, system control, data processing, communication coordination and fault management.

[0050] The power management module is used for providing stable direct current power supply for each functional module in the TBOX terminal, and realizing low-power consumption management of the TBOX terminal.

[0051] The backup battery module is used for maintaining the TBOX terminal to work for a period of time in the case that the vehicle-mounted storage battery is detached. The power management module switches to the backup battery module in the case that the vehicle-mounted storage battery is detached, and the backup battery module provides stable direct current power supply for the microprocessor and the plurality of functional modules, so as to ensure the success of the emergency call.

[0052] The CAT1 communication module can be a CAT1 communication module developed based on an ASR 1603 chip, used for data uploading / download, voice call and GNSS positioning function of the TBOX terminal based on cellular network, and communicates with the microprocessor through a UART / SPI communication protocol; the CAT1 communication module internally contains an audio processing module, which transmits uplink audio signals through MIC_IN and downlink audio signals through Audio_OUT. The ASR 1603 chip supports LTE CAT1 and GSM communication modes, can cover all frequency bands from 450 MHz to 2.7 GHz, can adapt to different regions and network environments, and meets various communication needs.

[0053] The CAN module can be a CAN communication module based on a CA-IF 1042VS-Q1 chip, used for

[0054] The TBOX terminal communicates with other ECU units of the vehicle, collects relevant information for uploading to the vehicle enterprise background, and communicates with the microprocessor through a CAN communication protocol.

[0055] The other functional modules can include key detection, LED driving and other extended functional modules.

[0056] The eCall method based on the CAT1 technology provided in the application is used for the above-mentioned NG-eCall TBOX terminal based on the CAT1 technology, as shown in the figure, the method comprises the following steps: Figure 2

[0057] S101, the microprocessor judges whether the vehicle is in an emergency situation;

[0058] Specifically, in the step S101, the microprocessor judges whether the vehicle is in an emergency situation, comprising: the microprocessor receives an emergency rescue trigger signal sent by the CAN network in the vehicle, and determines that the vehicle is in an emergency situation; and / or, the microprocessor receives an airbag trigger signal, and determines that the vehicle is in an emergency situation; and / or, the microprocessor receives an emergency rescue key trigger signal, and determines that the vehicle is in an emergency situation.

[0059] S102, when the microprocessor judges that the vehicle is in an emergency situation, the microprocessor calls an emergency rescue number according to the emergency rescue trigger signal;

[0060] The UART / SPI communication protocol informs the CAT1 communication module to dial an emergency rescue phone number;

[0061] S103, the CAT1 communication module searches for an optimal LTE network, establishes IMS registration, so that the CAT1 communication module can make a VoLTE call;

[0062] ​S104, the CAT1 communication module receives vehicle position information through a satellite positioning antenna, and sends the vehicle position information to the microprocessor, and the microprocessor generates minimum data set (MSD) data according to the vehicle position information;

[0063] Specifically, the MSD data includes at least one of vehicle position information, driving direction, accident occurrence time, accident severity and passenger number.

[0064] S105, the CAT1 communication module is connected with a WAN antenna through a WAN antenna interface, is connected to an LTE CAT1 network through the WAN antenna, sends the MSD data to an emergency rescue center through the LTE CAT1 network, and dials an emergency number using VoLTE to establish a voice call with the emergency rescue center.

[0065] In some embodiments of the application, the method further comprises: the microprocessor encrypts the MSD data by a preset encryption algorithm, and sends the encrypted MSD data to the emergency rescue center.

[0066] Specifically, the preset encryption algorithm includes at least one of symmetric encryption algorithm SM4, asymmetric encryption algorithm SM2 and digest encryption algorithm SM3.

[0067] SM2 and digest encryption algorithm SM3.

[0068] In some embodiments of the application, as shown in Figure 3 the above method further comprises the following steps:

[0069] S201, after hanging up the phone, when the emergency rescue center calls back, the CAT1 communication module receives a voice call request through the LTE CAT1 network;

[0070] S202, the CAT1 communication module sends the voice call request to the microprocessor;

[0071] S203, after receiving the voice call request sent by the CAT1 communication module, the microprocessor informs the CAT1 communication module to answer the callback call of the emergency rescue center through the UART communication protocol, and the CAT1 communication module establishes a voice call with the emergency rescue center through the LTE CAT1 network.

[0072] It can be seen that when the vehicle is in an emergency, the TBOX terminal of the application can trigger eCall voice call through the in-vehicle CAN network, airbag signal and external button signal, and can receive the callback voice call of the emergency rescue center after hanging up the phone. In order to facilitate understanding, as Figure 4As shown, this application also provides the following process for implementing eCall voice calls and callbacks on a TBOX terminal:

[0073] Step 1: After a vehicle collision, the eCall is automatically triggered, or the passenger can manually trigger the eCall by pressing the SOS button. The vehicle's CAN network, airbag signal, and button signal send a trigger signal to the microprocessor.

[0074] Step 2: The microprocessor notifies the CAT1 communication module to enter the eCall process via the UART communication protocol.

[0075] Step 3: The CAT1 communication module searches for the optimal LTE network (supporting global frequency bands such as Band 3 / 5 / 8 / 20), establishes IMS registration, and enables the CAT1 module to obtain VoLTE calling capability.

[0076] Step 4: The CAT1 communication module obtains coordinates through the GNSS antenna, compiles the MSD data packet, and uploads the MSD data packet through 4G LTE CAT1.

[0077] Step 5: The CAT1 communication module uses Volte HD voice to dial the emergency number 112 and establish a voice call with the emergency rescue center.

[0078] Step 6: After hanging up the phone, when the emergency rescue center calls back, the CAT1 communication module receives the eCall voice call request through the 4G LTE Cat1 network.

[0079] Step 7: The CAT1 communication module notifies the microprocessor via IO signals.

[0080] Step 8: After receiving the incoming call signal from the CAT1 communication module, the microprocessor notifies the CAT1 communication module to answer the callback call from the emergency rescue center via the UART communication protocol.

[0081] Step 9: The CAT1 communication module establishes an eCall voice call with the emergency rescue center through the 4G LTE Cat1 network.

[0082] like Figure 5 As shown, this application also provides a circuit diagram of a TBOX terminal, which includes a CAN transceiver U1, a microprocessor U2, and a CAT1 communication module U3.

[0083] The circuit diagram is explained below:

[0084] TBOX terminal eCall voice call and callback process:

[0085] When the vehicle is in an emergency, the in-vehicle CAN network, airbag signal, and external button signal trigger the eCall voice call, and after hanging up the phone, the emergency rescue center can receive the callback voice call.

[0086] The in-vehicle CAN network transmits the emergency rescue trigger signal to the TBOX terminal internal CAN transceiver U1 through the CAN communication protocol, and the TBOX terminal internal CAN transceiver U1 sends the emergency rescue trigger signal to the microprocessor U2, or the microprocessor U2 receives the airbag trigger signal SRS_IN / external button trigger signal KEY_IN, and the microprocessor U2 notifies the CAT1 communication module U3 to dial an emergency rescue phone according to the UART / SPI communication protocol.

[0087] The CAT1 communication module U3 is connected to the GNSS antenna through the GNSS antenna interface CON1, and the CAT1 communication module U3 receives GNSS positioning information through the GNSS antenna and packs the MSD data.

[0088] The CAT1 communication module U3 is connected to the WAN antenna through the WAN antenna interface CON2, and the CAT1 communication module U3 is connected to the LTE CAT1 network through the WAN antenna, sends the MSD data through the LTE CAT1 network, uses Volte HD voice to dial the 112 emergency number, and establishes a voice call with the emergency rescue center.

[0089] The uplink audio signal is transmitted through MIC_IN, and the downlink audio signal is transmitted through Audio.

[0090] After the TBOX terminal or the emergency rescue center hangs up the phone, when the emergency rescue center calls back, the CAT1 communication module U3 is connected to the WAN antenna through the WAN antenna interface CON2, and the CAT1 communication module U3 is connected to the LTE CAT1 network through the WAN antenna, receives the emergency rescue center eCall voice call request through the LTE CAT1 network, and the CAT1 communication module U3 notifies the microprocessor U2 of the incoming call signal.

[0091] After the microprocessor U2 receives the incoming call signal sent by the CAT1 communication module U3, the microprocessor U2 notifies the CAT1 communication module U3 to answer the callback call from the emergency rescue center according to the UART communication protocol.

[0092] The CAT1 communication module U3 is connected to the WAN antenna through the WAN antenna interface CON2, and the CAT1 communication module U3 is connected to the LTE CAT1 network through the WAN antenna, establishes an eCall voice call with the emergency rescue center through the LTE CAT1 network, transmits the uplink audio signal through MIC_IN, and transmits the downlink audio signal through Audio.

[0093] The eCall method based on CAT1 technology provided in the application is used for a vehicle terminal of NG-eCall, and the vehicle terminal comprises a microprocessor and a CAT1 communication module.

[0094] The UART / SPI communication protocol informs the CAT1 communication module to dial an emergency rescue phone number; the CAT1 communication module searches for an optimal LTE network, establishes IMS registration, and enables the CAT1 communication module to perform

[0095] VoLTE call; the CAT1 communication module receives vehicle position information through a satellite positioning antenna, and sends the vehicle position information to the microprocessor; the microprocessor generates minimum data set (MSD) data according to the vehicle position information; the CAT1 communication module is connected to a WAN antenna through a WAN antenna interface, is connected to an LTE CAT1 network through the WAN antenna, sends the MSD data to an emergency rescue center through the LTE CAT1 network, and dials an emergency number using VoLTE to establish a voice call with the emergency rescue center. Compared with the prior art, the application uses the high cost performance of the CAT1 communication module to replace the existing emergency call method, and provides more reliable and advanced vehicle emergency communication functions. At the same time, efficient use of resources is achieved, and costs are reduced.

[0096] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, and not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application, and they should be covered in the scope of the claims and the specification of the application.

Claims

1. A CAT1 technology-based eCall method for a vehicle terminal of an NG-eCall, the vehicle terminal comprising a microprocessor and a CAT1 communication module, characterized in that, The method comprises: The microprocessor determines whether the vehicle is in an emergency situation; When the microprocessor determines that the vehicle is in an emergency situation, the microprocessor informs the CAT1 communication module to dial an emergency rescue phone number according to the UART / SPI communication protocol; The CAT1 communication module searches for an optimal LTE network, establishes IMS registration, and enables the CAT1 communication module to make a VoLTE call; The CAT1 communication module receives vehicle location information through a satellite positioning antenna and sends the vehicle location information to the microprocessor, and the microprocessor generates minimum data set (MSD) data according to the vehicle location information; The CAT1 communication module is connected to a WAN antenna through a WAN antenna interface, is connected to an LTE CAT1 network through the WAN antenna, sends the MSD data to an emergency rescue center through the LTE CAT1 network, and dials an emergency number using VoLTE to establish a voice call with the emergency rescue center.

2. The CAT1 technology based eCall method of claim 1, wherein, The microprocessor determines whether the vehicle is in an emergency situation, comprising: The microprocessor receives an emergency rescue trigger signal sent by a CAN network in the vehicle and determines that the vehicle is in an emergency situation; and / or, The microprocessor receives an airbag trigger signal and determines that the vehicle is in an emergency situation; and / or, The microprocessor receives an emergency rescue key trigger signal and determines that the vehicle is in an emergency situation.

3. The CAT1 technology based eCall method of claim 1, wherein, The MSD data includes at least one of vehicle location information, driving direction, accident occurrence time, accident severity, and number of passengers.

4. The CAT1 technology based eCall method of claim 1, wherein, The method further comprises: After hanging up the phone, when the emergency rescue center calls back, the CAT1 communication module receives a voice call request through the LTE CAT1 network; The CAT1 communication module sends the voice call request to the microprocessor; After receiving the voice call request from the CAT1 communication module, the microprocessor informs the CAT1 communication module to answer the call from the emergency rescue center through the UART communication protocol, and the CAT1 communication module establishes a voice call with the emergency rescue center through the LTE CAT1 network.

5. The CAT1 technology based eCall method of claim 1, wherein, The method further comprises: The microprocessor encrypts the MSD data using a preset encryption algorithm and sends the encrypted MSD data to the emergency rescue center.

6. The CAT1 technology based eCall method of claim 5, wherein, The preset encryption algorithm includes at least one of a symmetric encryption algorithm SM4, an asymmetric encryption algorithm SM2, and a digest encryption algorithm SM3.

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