Data transmission method and data transmission device for vehicle

Abstract

The invention relates to a data transmission method and a data transmission device for data transmission in a vehicle-to-everything communication network, in particular a V2X type. To this end, a data frame (2) is transmitted according to a vehicle-to-everything communication mode called V2X. The frame (2) advantageously comprises a series (200) of a plurality of identical data packets (21 to 24) which are consecutive in the data frame, each data packet (21 to 24) comprising an identical set of identical data.

Description

Technical Field

[0001] The present invention relates to a data transmission method and a data transmission device for vehicles, especially motor vehicles. The present invention more specifically relates to a data transmission method and a data transmission device for transmitting data according to a vehicle-to-anything communication mode called V2X, and the data transmission method and the data transmission device are especially used for transmitting emergency messages or warning messages. Background Art

[0002] Modern vehicles are equipped with communication systems which enable the vehicles to exchange information between one another or with their environment (in particular information associated with, for example, warning messages or emergency messages in order to notify of dangers).

[0003] As a result, new information and communication technologies have emerged for use in the transport sector, such as Europe’s ITS G5 (Intelligent Transportation System G5, or Système de transportintelligent G5 in French) or the United States’ DSRC (Dedicated Short Range Communications, or Communications dédiées à courte portée in French), both of which are based on the IEEE 802.11p standard or on a cellular network technology called C-V2X (Cellular-Vehicle to Everything, or Cellulaire-Véhicule Vers Tout, in French), which relies on 4G based on LTE (Long Term Evolution, or Evolution à long terme, in French) and the upcoming 5G.

[0004] Since vehicles are mobile in nature, data transmission is sometimes accompanied by errors and / or information loss (e.g., due to temporary connection loss). These transmission problems can be particularly harmful when the data transmitted by the vehicle relates to warning messages or emergency messages used to notify road users of, for example, impending danger. Summary of the invention

[0005] The present invention aims to secure data transmission in a vehicle-to-everything type of communication system known as V2X.

[0006] Another object of the invention is to improve the reliability of data transmission carried out by the vehicle, in particular data relating to emergency situations or distress.

[0007] According to a first aspect, the invention relates to a method for data transmission for a vehicle, said method comprising the transmission of a data frame according to a vehicle-to-everything communication mode known as V2X, said frame comprising a series of a plurality of identical data packets that are consecutive in said frame.

[0008] According to a variant, a different error detection coding is associated with each of the data packets of the series.

[0009] According to another variant, a different error correction coding is associated with each of the data packets of the series.

[0010] According to an additional variant, each data packet of the series comprises an identical set of identical data characterizing an emergency message or an alert message.

[0011] According to an additional variant, the data of said set of data correspond to message data of the CAM or DENM type.

[0012] According to yet another variant, a transmission time interval is associated with each data packet of said series, said series forming a combination of transmission time intervals.

[0013] According to another variant, the number of identical data packets contained in the series is determined based on a transmission performance indicator.

[0014] In particular, in an embodiment, the performance indicator includes at least one of the following elements:

[0015] -Packet error rate;

[0016] -Frame error rate;

[0017] - amount of acquisition;

[0018] -Outstanding quantity.

[0019] According to a second aspect, the invention relates to a data transmission device for a vehicle, the device comprising a memory associated with a processor, the processor being configured to implement the steps of the method according to the first aspect of the invention.

[0020] According to a third aspect, the invention relates to a vehicle, for example of the motor vehicle type, and comprising a device according to the second aspect of the invention as described above.

[0021] According to a fourth aspect, the invention relates to a computer program comprising instructions adapted to perform the steps of the method according to the first aspect of the invention, in particular when the computer program is executed by at least one processor.

[0022] Such a computer program may use any programming language and be in the form of source code, in object code or in an intermediate code between source code and object code, for example in a partially compiled form or in any other desired form.

[0023] According to a fifth aspect, the present invention relates to a recording medium readable by a computer, on which a computer program is recorded, the computer program comprising instructions for executing the steps of the method according to the first aspect of the present invention.

[0024] On the one hand, the recording medium can be any entity or device capable of storing the program. For example, the medium can include a storage component (such as a ROM memory, a CD-ROM or a ROM memory of a microelectronic circuit type) or a magnetic recording component or a hard disk.

[0025] On the other hand, the recording medium can also be a transmissible medium, such as an electrical or optical signal, which can be transmitted via an electrical or optical cable, by conventional radio or Hertzian radio or by a self-guided laser beam or by other means. The computer program according to the invention can in particular be downloaded from a network of the Internet type.

[0026] Alternatively, the recording medium may be an integrated circuit in which the computer program is embedded, the integrated circuit being suitable for executing or being used for executing the method in question. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] By reading the following detailed description of the non-limiting embodiments of the present invention and the attached Figures 1 to 4 , other features and advantages of the present invention will become more apparent in the accompanying drawings:

[0028] - Figure 1 A V2X communication environment according to a particular embodiment of the present invention is schematically shown;

[0029] - Figure 2 Schematically shows a method according to a particular embodiment of the present invention. Figure 1 The structure of a data frame transmitted by a vehicle in a communication environment;

[0030] - Figure 3 Schematically shows a configuration for transmitting according to a particular embodiment of the present invention Figure 2 a device for providing a data frame;

[0031] - Figure 4 A method for using the device according to a particular embodiment of the present invention is shown. Figure 1 Figure 2 is a flow chart of the different steps of the method for data transmission in a vehicle environment. DETAILED DESCRIPTION

[0032] Now, in the following joint reference Figures 1 to 4 A data transmission method and a data transmission device for vehicles, in particular for data transmission in a V2X type communication network, are described.

[0033] According to a non-limiting particular embodiment of the invention, a data transmission method for data transmission, in particular in a communication network of the V2X type, comprises transmitting one or more data frames according to a vehicle-to-anything communication mode called V2X. Each frame advantageously comprises a series of a plurality of identical data packets, which are consecutive in said data frame, each data packet comprising an identical set of identical data.

[0034] The concatenation of a plurality of identical data packets in the same data frame for transmission to one or more destinations can improve the security of the transmission, that is to say can increase the probability that the data contained in the data packets are effectively received by the one or more destinations.

[0035] Figure 1 A communication environment 1 in a communication network of the V2X type (“Vehicle-to-everything” in English or “Véhicule Vers Tout” in French) is schematically shown according to a non-limiting particular embodiment of the invention.

[0036] Figure 1 A first vehicle 10 is shown traveling in a road environment. The first vehicle 10 is advantageously equipped with a communication device for transmitting and receiving data to another communication device, such as a communication device carried in a second vehicle 11 or carried by a pedestrian 12 or a cyclist 13. Each communication device can be analogized to a node of a network (e.g., an ad hoc wireless network).

[0037] The first vehicle 10 transmits information or data destined for a second vehicle, a pedestrian 12 and / or a cyclist 13 by using a vehicle-to-anything communication system called V2X, which is based on the IEEE 802.11p standard of 3GPP LTE-V or ITS G5, for example. In such a V2X communication system, each vehicle is equipped with a node to allow vehicle-to-vehicle V2V (English for "vehicle-to-vehicle") communication, vehicle-to-infrastructure V2I (English for "vehicle-to-infrastructure") communication and / or vehicle-to-pedestrian V2P (English for "Vehicle-to-pedestrian") communication, and the pedestrian (or the cyclist) is equipped with a mobile device (e.g., a smartphone (English for "Smartphone")) configured to communicate with the vehicle.

[0038] Ad hoc wireless networks, also called WANET (Wireless Ad Hoc Network) or MANET (Mobile Ad Hoc Network), are decentralized wireless networks. Unlike centralized networks based on existing infrastructures, for example comprising routers or service points connected to one another by a wired or wireless infrastructure, ad hoc wireless networks consist of nodes, each of which participates in the routing of the data by retransmitting the data from a transmitter towards the destination from one node to another, according to the connectivity of the network and the implemented routing algorithm. The ad hoc wireless network advantageously corresponds to an Ad Hoc Vehicular Network (or VANET, Vehicular Ad hoc NETwork) or to an Intelligent Vehicular Network (or InVANET, Intelligent Vehicular Adhoc NETwork, also called GeoNetworking). In such a network, each of two or more vehicles is equipped with nodes that can communicate with each other in the context of vehicle-to-vehicle (V2V) communication; each vehicle can communicate with infrastructure installed in the context of vehicle-to-infrastructure (V2I) communication; each vehicle can communicate with one or more pedestrians equipped with mobile devices (such as smart phones) in the context of vehicle-to-pedestrian (V2P) communication.

[0039] The self-organizing wireless network includes transmission repeaters 101, 102, which correspond to one or more UBRs ("Unité Bord de Route (Road Vehicle Unit)") 101, 102, for example, each of the one or more UBRs corresponds to a node of the network in addition to the nodes equipped on the vehicle or the pedestrian. According to a variant, the transmission repeaters 101, 102 correspond to relay antennas of a cellular network (for example, the so-called 4G or 5G cellular network). According to a further variant, in addition to the nodes equipped on the vehicle or the pedestrian, the self-organizing wireless network includes one or more UBRs and one or more relay antennas of a cellular network. According to this variant, node 101 corresponds to a UBR, for example, and node 102 corresponds to a relay antenna.

[0040] The repeaters 101 and 102 are advantageously connected to one or more remote servers or to the "cloud" (or "nuage" in French) 100 via a wired connection and / or a wireless connection. Thus, the repeaters 101 and 102 can be used as repeaters between the "cloud" 100 and the first vehicle 10, the second vehicle 11, the pedestrian 12 and / or the cyclist 13.

[0041] According to a variant embodiment, the first vehicle 10 transmits data destined for the second vehicle 11, the pedestrian 12 and / or the cyclist 13 according to a direct communication mode, that is to say a communication mode without communication via an infrastructure network including the repeaters 101 and 102. The direct communication mode corresponds, for example, to:

[0042] - ITS G5 in Europe or DSRC (Dedicated Short Range Communications in English or Communications dédiées à courte portée in French) in the United States, both of which are based on the IEEE 802.11p standard; or

[0043] -LTE-V Mode 4 (“Long-Term Evolution-Vehicle Mode 4” in English, or “Evolution à long terme-véhicule Mode 4” in French), which allows V2V communication (also called “sidelink” (or “liaison latérale” in French) communication based on the LTE direct communication interface called PC5); this technology is described, for example, in the article entitled “Analytical Models of the Performance of C-V2X Mode4Vehicular Communications” written by Manuel Gonzalez-Martin, Miguel Sepulcre, Rafael Molina-Masegosa and Javier Gozalvez and published in 2018.

[0044] In a first operation, a data frame comprising a series of identical data packets is formed by the first vehicle 10. The data frame corresponds, for example, to the reference Figure 2 The data packets are so-called identical because the useful data ("Payload" in English) carried by each of these data packets is identical. The number of identical data packets in the series is, for example, between 2 and 10, for example, equal to 2, 3, 4, or 5 data packets.

[0045] Each data packet of the series advantageously comprises data characterizing an emergency message and / or an alert message and / or a distress message, which data are capable of informing one or more destinations of the data frame of a danger or emergency. These data correspond, for example, to data of one or more messages of the DENM type (for "Decentralized Environmental Notification Message" in English, or "Message denotification environmental décentralisée" in French), as defined, for example, in the technical specification ETSI TS 102 637-3 v1.1.1 of September 2010. According to another example, these data correspond, for example, to data of one or more messages of the CAM type (for "Cooperative Awareness Message" in English, or "Message d'avertissement coopératif" in French), as defined, for example, in the technical specification ETSI TS 102 637-2 v1.2.1 of March 2011.

[0046] The data packets are regrouped so as to be consecutive in the data frame, that is to say the series of data packets are regrouped, for example, in transmission bursts (“Transmission burst” in English) or in transmission time interval bundlings (“Transmission Time Interval bundling” in English, so-called “TTI bundling”, or “groupementTTI” in French), a so-called TTI transmission time interval (e.g. equal to 40 ms) being associated with or assigned to each data packet of the series of data.

[0047] The number of data packets of the series corresponds, for example, to a default parameter, which is fixed whatever the situation.

[0048] According to a variant, the number of packets of the series corresponds to the value of a parameter settable, for example, by a user.

[0049] According to another variant, the number of packets of the series is a parameter dynamically and automatically configured by the means for constructing the data frame. According to this last variant, the number of packets included in the series is determined according to conditions or according to the transmission or according to the quality of the connection between the first vehicle 10 on the one hand and one or more destinations of the frame on the other hand.

[0050] According to another variant, the number of identical data packets included in the series is determined based on a transmission performance indicator. Thus, the performance indicator corresponds to a parameter expressing the quality of the transmission conditions.

[0051] In particular, in an embodiment, the performance indicator includes at least one of the following elements:

[0052] - Packet Error Rate (see below);

[0053] - frame error rate (see below);

[0054] - Reimbursement amount (see below);

[0055] - Outstanding Amount (see below).

[0056] The performance indicator is estimated by the device constructing the frame (and installed in the first vehicle 10), for example based on an indicator such as PER (Packet Error Rate in English, or Taux d'erreur paquet in French), an indicator such as FER (Frame Error Rate in English, or Taux d'erreur de trame in French), a number of received reimbursements or an indicator of the number of outstanding reimbursements. These indicators are determined, for example, based on the frames or data packets previously transmitted by the first vehicle 10 according to retours implemented by one or more destinations of the previously transmitted frames or data packets. The better the connection (for example the lower the PER and / or FER, or the higher the number of reimbursements relative to the number of previously transmitted data packets), the smaller the number of data packets in the series (for example 2 or 3 identical data packets are implemented in the series). Conversely, the worse the connection is (e.g. the higher the PER and / or FER, or the lower the amount of repayments relative to the number of previously transmitted data packets (or the higher the amount of outstanding repayments relative to the number of previously transmitted data packets), the greater the number of data packets in the series (e.g. implementing 4 or 5 identical data packets in the series).

[0057] In a second operation, a frame including the series of identical data packets is transmitted according to a V2X communication mode (e.g., according to a direct communication mode). The frame is transmitted, for example, according to a broadcast transmission mode (“broadcast” in English), that is, to a set of communication devices configured to communicate with the first vehicle 10 according to the V2X communication mode as a destination. The set includes, for example, the second vehicle 11, the pedestrian 12, and the cyclist 13, and Figure 1. According to another example, the frame is transmitted according to a multicast transmission mode ("multicast" in English), that is to say to a plurality of communication devices each of which is identified by its own address as destination. According to another example, the frame is transmitted according to a unicast transmission mode ("unicast" in English), that is to say to a communication device only identified by its own address (for example a communication device carried by pedestrian 12) as destination. The transmission mode depends, for example, on the properties of the data contained in the series of data packets.

[0058] The successive transmission of multiple identical data packets can significantly increase the probability that the data contained in the data packets will be effectively received and decoded by one or more destinations for the data packets.

[0059] In addition, the successive transmission of a plurality of identical data packets can significantly reduce the delay time between two data packets. In the prior art, it is known to retransmit a data packet when a previously transmitted data packet has not been received (at least partially) or when the data of a previously transmitted data packet has not been correctly decoded. The new transmission is usually implemented after receiving a destination message, which is used to indicate to the transmitter, for example via the transmission of an outstanding (so-called Non-ACK or NACK), that the data packet has not been received or has not been decoded. The delay time between the transmission of the first data packet and the transmission of the second data packet is thus particularly large, which is very problematic when the data contained in the data packet is related to an emergency or distress situation. By the successive transmission of a plurality of identical data packets, the delay is reduced to a minimum. When the destination does not correctly receive the first data packet of the series, the next data packet of the series will be received immediately without having to implement a request, which can increase the probability that all data can be received and decoded, even if errors are present in some data packets. The reliability of the connection is thereby greatly improved.

[0060] In order to further increase the reliability of the connection, according to a variant implementation, a different error detection code is associated with each of the packets in the series. This error detection code corresponds, for example, to a CRC ("Cyclic Redundancy Check" in English or " de redondance cyclique”).

[0061] According to a variant, different error correction bits are associated with each data packet. This variant makes it possible to improve the reliability of data transmission while increasing the probability that the data of a partially transmitted or erroneously transmitted data packet can be reconstructed based on correctly received data. These bits correspond, for example, to FEC data (“Forward Error Correction” in English or “Correction d'erreur sans voie de retour” in French) or to Reed-Solomon coding.

[0062] Figure 2 Schematically shows a non-limiting particular embodiment according to the present invention. Figure 1 The structure of a data frame 2 transmitted by the first vehicle 10 with one or more destinations as destinations in a communication environment.

[0063] Frame 2 corresponds, for example, to a data frame conforming to the TCP protocol described in document RFC 793 ("Requests for Comments" in English or "Requêtes pour commentaires" in French). Frame 2 (also called segment) corresponds to a sequence of binary values, Figure 2 Only certain elements specific to the present invention are shown above.

[0064] The frame 2 comprises a frame header 20 followed by a plurality of data packets or data segments. Each data packet conforms to the "GeoNetworking" protocol, for example, and the structure of such a data segment is described, for example, in the document ETSI TS 102 636-4-1. The data segment is also called a data packet, for example, described by the abbreviation GN-PDU (English for "GeoNetworking Protocol Data Unit", or French for "Unité de données du protocole GeoNetworking").

[0065] Data segments intended for the same destination (or multiple same destinations) are encapsulated in data frame 2.

[0066] According to another example, the data segment of frame 2 corresponds to a data packet of message data (e.g., message data related to emergency braking and message data related to an immediate danger approaching by the first vehicle) transmitted by the same vehicle (e.g., the first vehicle 10) to the server of the "cloud" as the destination.

[0067] The data frame 2 advantageously comprises a series of more than 200 data packets 21, 22, 23, 24 which are identical and arranged successively in the data frame 2. In other words, the data packet 21 comprises the same useful data as each of the other data packets 22 to 24, each carrying the same set of data.

[0068] The data packets 21 to 24 of the series 200 advantageously correspond to a combined TTI 200. A so-called TTI transmission time interval is advantageously associated with each data packet 21 to 24 for transmitting each data packet 21 to 24. The duration of said interval is for example equal to 10 ms, 20 ms or 40 ms.

[0069] Each data packet 21 to 24 comprises the same useful data, which advantageously corresponds to data relating to an emergency message, an alert message, a distress message and / or a safety message. These data are, for example, message data of the CAM and / or DENM type. These data are, for example, encoded in the GN-PDU data packet using UPER (Unaligned Packed Encoding Rules in English, or Règles d'encodage par paquet non alignées in French) type encoding rules of the ASN.1 (Abstract Syntax Notation One in English, or Notation de syntaxe abstraite 1 in French) standard.

[0070] According to a particular implementation variant, a different error detection code is associated with each data packet 21 to 24 .

[0071] According to another particular implementation variant, a different error correction coding is associated with each data packet 21 to 24 .

[0072] The structure of this frame allows the successive transmission (from a time perspective) of each of the data packets 21 to 24, with the transmission of the first data packet 21 being followed by the transmission of the second data packet 22, which is followed by the transmission of the third data packet 23, which is in turn followed by the transmission of the fourth data packet 24 of the series 200.

[0073] Of course, the number of data packets in series 200 is not limited to 4, but can be extended to any number, such as 2, 3, 5, 6 or more data packets.

[0074] Figure 3 A device 3 according to a non-limiting particular embodiment of the present invention is schematically shown, which is configured for Figure 1The device 3 corresponds, for example, to a node loaded in the vehicle 10 or the vehicle 11 or to a node carried by a pedestrian (for example, a smart phone). The device 3 is configured, for example, to transmit the data contained in the frame 2. According to a variant, the device 3 is also configured to construct and generate Figure 2 The data frame 2.

[0075] The device 3 is configured, for example, to implement the reference Figure 1 and Figure 2 Operations described and / or referenced Figure 4 The steps of the described method. Examples of such a device 3 include, but are not limited to: on-board electronic equipment (e.g., a vehicle on-board computer), an electronic computer (e.g., a UCE ("Unité de Commande Electronique")), a road vehicle unit, a smartphone, a tablet computer, a laptop computer, a server. The elements of the device 3 may be integrated individually or in combination in a single integrated circuit, a plurality of integrated circuits and / or discrete components. The device 3 may be implemented in the form of an electronic circuit or a software (or information) module, or in the form of a combination of an electronic circuit and a software module. According to different specific embodiments, the device 3 is communicatively connected to other devices or similar systems, for example, by means of a communication bus or through a dedicated input / output port.

[0076] The device 3 comprises one (or more) processors 30, which are configured to execute instructions to implement the steps of the method and / or execute instructions of one or more software loaded in the device 3. The processor 30 may include integrated memory, input / output interfaces and various circuits known to those skilled in the art. The device 3 also includes at least one memory 31, which corresponds to volatile and / or non-volatile memory, and / or includes memory storage means that may include volatile and / or non-volatile memory, such as EEPROM, ROM, PROM, RAM, DRAM, SRAM, flash memory, magnetic disk or optical disk.

[0077] Information encoding one or more on-board software including instructions to be loaded and executed by the processor is stored, for example, on the first memory 31 .

[0078] According to a non-limiting particular embodiment, the device 3 comprises a block 32 of interface elements for communicating with external devices such as, for example, a remote server or a "cloud" or other node of the ad hoc network. The interface elements of the block 32 comprise one or more of the following interfaces:

[0079] - a radio frequency interface RF, which is for example LTE ("Long-Term Evolution" in English, or "Evolution à long terme" in French), LTE-Advanced (or "LTE-avancé" in French) types;

[0080] -Interface USB ("Universal Serial Bus" in English, or "Bus Universel en Série" in French);

[0081] -Interface HDMI (“High Definition Multimedia Interface” in English, or “Interface Multimedia Flaute Définition” in French).

[0082] Data are loaded towards the device 3, for example, via the interface of the block 32, using, for example, a protocol according to IEEE 802.11. A network, an ITS G5 network based on IEEE 802.11p, or a mobile network such as a 4G network (or LTE Advanced according to 3GPP release 10) or a 5G network (in particular an LTE-V2X network).

[0083] According to another particular embodiment, the device 3 comprises a communication interface 33 capable of establishing communication with other devices (for example other computers of the onboard system when the device 3 corresponds to a computer of the onboard system) via a communication channel 330. The communication interface 33 corresponds, for example, to a transmitter configured to transmit and receive said information and / or said data via the communication channel 330. The communication interface 33 corresponds, for example, to a CAN (“Controller Area Network” in English or “Réseau de ”) or CAN FD (“Controller Area Network Flexible Data-Rate” in English, or “Réseau de A wired network of the "flexible" type.

[0084] According to additional particular embodiments, the device 3 may provide output signals to one or more external devices (eg a display screen, one or more speakers and / or other peripheral devices) via output interfaces not shown, respectively.

[0085] Figure 4A flowchart showing different steps of a data transmission method for a vehicle according to a non-limiting particular embodiment of the present invention. The method is performed, for example, by a device installed in the vehicle 10 or by Figure 3 Implementation of device 3.

[0086] In a first step 41, a data frame is transmitted according to a vehicle-to-everything communication mode known as V2X. The data frame advantageously comprises a series of a plurality of identical data packets that are consecutive in said frame.

[0087] The data frame is received, for example, from a memory or from a device configured to construct the data frame.

[0088] Of course, the present invention is not limited to the embodiments described above, but extends to a method for generating a data frame (which includes the series of identical data packets) and an apparatus configured to implement the frame generation method.

[0089] The present invention also relates to a receiving method for receiving a data frame (the data frame comprises a series of identical and consecutive data packets) and an associated data frame receiving device.

[0090] The invention also relates to a vehicle, such as a motor vehicle or more generally a vehicle with a land engine, and comprising Figure 3 Device 3.

Claims

1. A data transmission method for a vehicle (10), the data transmission method comprising transmitting (41) a data frame (2) according to a vehicle-to-everything communication mode called V2X, the data frame (2) comprising a series (200) of a plurality of identical and consecutive data packets (21 to 24) in the data frame (2), wherein: The number of identical data packets included in the series (200) is determined based on a transmission performance indicator, the transmission performance indicator comprising at least one of the following elements: -Packet error rate; -Frame error rate; - Amount of repayment; -Outstanding quantity.

2. The data transmission method according to claim 1, wherein: A different error detection code is associated with each of the data packets (21 to 24) of the series (200).

3. The data transmission method according to claim 1 or 2, wherein: A different error correction coding is associated with each of the data packets (21 to 24) of the series (200).

4. The data transmission method according to any one of claims 1 to 3, wherein: Each data packet (21 to 24) of the series (200) comprises an identical set of identical data characterizing an emergency message.

5. The data transmission method according to claim 4, wherein: The data in the set of data corresponds to CAM or DENM type message data.

6. The data transmission method according to any one of claims 1 to 5, wherein: A transmission time interval is associated with each data packet (21 to 24) of the series (200), the series (200) forming a combination of transmission time intervals.

7. A data transmission device (3) for a vehicle, comprising a memory (31) associated with at least one processor (30), the at least one processor being configured to implement the steps of the data transmission method according to any one of claims 1 to 6.

8. A vehicle (10), comprising a data transmission device (3) according to claim 7.

9. A computer program product, comprising instructions, which are suitable for executing the steps of the data transmission method according to any one of claims 1 to 6 when the computer program is executed by at least one processor.

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