Method for transmitting information via radio frequency between two electronic devices

Abstract

System and method for radio frequency transmission of information between a transmitting device and a listening device: The transmission takes place following a first sequence on several frequency channels in a cyclical manner, the transmission of information on the frequency channels being equally distributed and alternating, the first sequence having a frequency F1, the elementary transmission of information on each frequency channel taking place over a duration T2, the first sequence comprising a transmission phase of a duration T5 followed by a silent phase of a duration T6, The listening takes place following a second cyclic sequence at a frequency F3 which is greater than the frequency F1, the listening on the frequency channels being equally distributed according to a pre-established order, the elementary listening on each channel taking place over a duration T4, The duration T5 of the first transmission phase on the channels is greater than or equal to half the duration T4 of elementary listening of each frequency channel.Figure for the abridged version: Fig. 4.

Description

Title of the invention: Method for radio frequency transmission of information between two electronic devices. Field of the invention

[0001] The present invention relates to the field of radio frequency communication between electronic devices, particularly those related to the transport vehicle and especially those installed on the mounted assemblies of the transport vehicle. Technological background

[0002] The recent development of connected objects necessitates equipping them with radio frequency transponders. Generally, these radio frequency transponders operate in the UHF (Ultra High Frequency) frequency range, i.e., between 300 MHz and 3 GHz, for the most efficient compromise between communication speed and the spatial footprint of the communication system. In the case of transport vehicles, such as pneumatic tire vehicles, connected objects can be moving components of these vehicles, such as the tires. Consequently, these components move during operation, following a planar motion around a fixed axis of rotation relative to the transport vehicle. Therefore, in a frame of reference linked to the transport vehicle, these transponders travel in closed loops.Therefore, wired connections of these radio frequency transponders to fixed electronic devices inside or outside the vehicle are difficult, or wired solutions are expensive and fragile. Consequently, radio communication between these various components is the most cost-effective and technically sound solution.

[0003] Document US20210021015Almontre describes, in the case of a land vehicle, the implementation of an on-board RFID (Radio Frequency Identification) tag reading system and TMS (Tire Mounted Sensor) sensors located in the tires of the vehicle's mounted assemblies. This system consists of a radio frequency reader / transmitter galvanically connected to four transmission lines leading to radio frequency antennas, each covering a specific geographic area. The radio frequency antennas are permanently attached to the fixed part of the land vehicle. However, radio communication between electronic devices is energy-intensive, particularly the radio frequency transmission phase compared to the radio frequency signal reception phase, or when communication between devices is bidirectional. Bilateral communication within the framework of the BLE (Bluetooth Low Emission) protocol requires one electronic device to be activated by another through the communication of information circulating on one or more dedicated frequency channels. This informs the other device of the bilateral communication setup to be established, and the multitude of frequency channels increases the efficiency of information transmission. However, electronic devices mounted on the rotating parts of the vehicle do not have unlimited power sources compared to those mounted in fixed locations, such as those on the vehicle's stationary body, which can draw power from a substantial or unlimited source, like the vehicle's battery. This can lead to inoperability due to insufficient power.

[0004] One of the objects of the following invention aims to solve the problems of loss of information transmission efficiency linked in particular to the energy consumption of transmitting electronic devices, especially if the transmitting electronic device is mobile within transport vehicles, for the communication of information to fixed receiving electronic devices, such as, for example, those mounted on the fixed part of the vehicle. Description of the invention

[0005] The invention relates to a radio frequency transmission method for information between an electronic transmitting device and an electronic listening device, the radio frequency transmission being carried out according to a first sequence on at least two different frequency channels in a cyclic manner, the transmission between the at least two frequency channels being equally distributed, the first sequence having a frequency Fl, the elementary transmission on each frequency channel being carried out over a duration T2, the radio frequency listening being carried out according to a second cyclic sequence at a frequency F3, the listening on the at least two frequency channels being equally distributed according to a pre-established order, the elementary listening on each channel being carried out over a duration T4, comprising the following steps: • Alternating transmission of information on each of the at least two frequency communication channels characterized in that the first sequence is emitted at a lower frequency Fl than the frequency F3 of the second sequence, in that the first sequence includes a first emission phase of duration T5 followed by a second silent phase of duration T6 and in that the duration T5 of the first emission phase on the at least two channels is greater than or equal to half the elementary listening duration T4 of each listening frequency channel.

[0006] Herein, the term "electronic transmitting device" or "electronic transmitting device" means that the electronic device emits radio waves. Here, the term "electronic listening device" or "electronic receiving device" means that the electronic device receives radio waves.

[0007] The following method solves the technical problem for the following reasons. Information is transmitted over two or more different frequency channels, which increases the probability of information transmission in the event of a malfunction or disturbance on one frequency channel. The probability that this malfunction or disturbance is also present on the other frequency channel is low. This probability is further increased by the alternating nature of information communication on each frequency channel, if the malfunction or disturbance is only temporary. Equipartitioning the communication channels allows the risk of malfunction or disturbance to be distributed equally across the different frequency channels. Furthermore, the communication is unilateral rather than bilateral, which saves energy in the entire system, and particularly in the transmitting device.

[0008] Finally, the transmission is concentrated over a given duration T5, which is proportional to the listening time T4, and at least half the duration T4, of each frequency channel of the listening device. Following this transmission period, a period T6 without transmission is scheduled before the repetition of the transmission frame. The frequency Fl of the transmission frame is lower than the frequency F3 of the listening frame. Thus, the transmission is concentrated over a long period instead of being transmitted more regularly at intervals. As a result, the probability that the transmission duration T5 partially coincides with the listening time T4 is increased, which improves the efficiency of the information transmission. Furthermore, the transmission over the duration T5 includes alternating transmission on the various frequency channels, one of which must necessarily be used for the listening time T4.Below a transmission duration T5 corresponding to half the listening duration T4, the efficiency rate of information communication from the transmitting device to the receiving device drops, which deteriorates the efficiency rate of information transmission.

[0009] Transmitting less frequently than listening, i.e., the frequency Fl being lower than the frequency F3, ensures energy savings at the level of the transmitting electronic device compared to a more frequent but shorter transmission strategy that is generally employed. Indeed, in general, the listening frequency F3 is lower than the transmission frequency FL

[0010] In conclusion, the proposed method improves the success rate of information transmission to a listening device while conserving energy of the transmission device compared to a conventional radio frequency transmission protocol.

[0011] Advantageously, the frequency Fl of the first sequence is not an integer multiple of the frequency F3 of the second sequence.

[0012] Thus, from one transmission sequence to another, it is ensured that the temporal pattern of concordance between the transmission and listening sequences is not duplicated, at least over a time period which corresponds to the first common multiple of the periods linked to Fl and F3, which multiplies the possibilities of temporal coupling between the transmission and reception of radio frequency signals over this period.

[0013] Preferably, the first phase of emission links the emission on at least two frequency channels in an uninterrupted manner for the duration T5.

[0014] The term "uninterrupted" here means that the elementary emissions of duration T2 follow one another consecutively during the emission duration T5 of the emission phase, that is, continuously and consecutively. Thus, the time separating two elementary emissions is less than the elementary emission duration T2, preferably less than half the elementary emission duration T2.

[0015] In order to optimize the coupling time between the transmitting and listening devices on the correct frequency channel, the radio frequency signal transmission must be uninterrupted for the transmission duration T5. This optimizes the probability of temporally coupling the transmission with the listening. Necessarily, especially when changing frequency channels, there is a transient time zone for switching from one elementary transmission to another. The fact that this zone is shorter than the duration T2 of the elementary transmission gives the impression of continuous radio frequency transmission.

[0016] Advantageously, radio frequency listening comprising a silent phase of duration T7 between two consecutive elementary listening phases of duration T4, the duration T7 of the silent phase being greater than or equal to the duration T4, the duration T5 of transmission is less than or equal to the summation of the duration T4 and half of the duration T7.

[0017] Although it makes the transmission duration T5 greater than half the listening duration T4 on one of the frequency channels, it is advantageous to limit the transmission duration in order to restrict the energy consumption of the transmitting electronic device, especially if the transmission is interrupted during the duration T5. Since the listening sequence consists of listening phases on each of the frequency channels of a duration T4 separated by a silent phase of a duration T7, and since the duration T7 is generally greater than or equal to the duration T4 of the listening phase on a frequency channel, it is more efficient, for the trade-off between the information transmission efficiency rate and energy consumption, for the transmission duration T5 to be not exceeding the proposed value. In most multi-channel listening devices, the listening period does not exceed twice the duration T4 of the listening phase on a frequency channel. The upper limit on the transmission duration T5 then ensures that part of the transmission from the transmitting electronic device will coincide with a listening phase of the receiving electronic device. In cases where the listening period exceeds twice the duration T4 of the listening phase on a frequency channel, the upper limit minimizes the number of inefficient information transmissions.

[0018] According to a first embodiment, the first emission phase comprises the repetition of the elementary emission of information m times on one of the at least two frequency channels before the same repetition of the elementary emission of information on the other of the at least two frequency channels, m being an integer greater than or equal to two.

[0019] This is a first embodiment in which the elementary transmission of information on a frequency channel is repeated before switching to a different frequency channel and performing the same repetition to ensure the equitable distribution of information transmission across the various frequency channels. This is desirable for regularly transmitting information discreetly over a duration T5, or in cases where the quality of information transmission is disrupted by external events. For example, in cases where the electronic transmitting device is mounted on a moving part of the vehicle, such as the vehicle's assembly, and the electronic listening device is mounted on a fixed part of the vehicle, the timing of information transmission can be affected by the azimuthal position of the electronic transmitting device while the vehicle is moving.In this case, repeating the information on the same frequency channel, but with the information spaced temporally and therefore having a different azimuthal position, increases the transmission rate of the information to the receiving electronic device on the vehicle.

[0020] According to another embodiment, the first emission phase comprises a periodic sequence of information emission on at least two frequency channels over n periods, n being an integer greater than or equal to two.

[0021] This is another way of defining the first transmission phase of duration T5. Here, in order to increase the probability of temporally coupling the transmission signal with the listening phase on the correct frequency channel, the first transmission phase is periodic, each period comprising one elementary transmission on each frequency channel. Of course, this embodiment can be implemented with uninterrupted transmission of information during the first transmission phase and / or coupled with the repetition of the elementary transmission of the same frequency channel over the period. This combination of the two embodiments is an optimized version for electronic transmitting devices located in the rotating parts of a vehicle.

[0022] Specifically, the radio frequency transmission is carried out according to a communication protocol operating at 2.4 GHz on forty frequency channels with a frequency width of 2 MHz between 2402 and 2480 MHz.

[0023] More specifically, there are at least two frequency channels, of which there are three.

[0024] This corresponds to the BLE protocol (Bluetooth Low Energy). Emission) is a widely used UHF communication protocol for electronic devices. Typically, this protocol uses three frequency channels to activate radio frequency communication between electronic devices, corresponding to the "advertising" mode, before switching to two-way communication between the devices on the other channels of the protocol. The three frequency channels of the "advertising" mode are generally less affected by other communication protocols using the same frequency band, making them preferred channels.

[0025] Advantageously, the elementary emission time T2 on each frequency channel is between 0.2 and 5 milliseconds, preferably between 1 and 3 milliseconds.

[0026] The shorter the elementary transmission time on a channel, the less energy the electronic device consumes, provided that the elementary transmission time is sufficient to transmit the information to be transmitted. For operation of the process according to the BLE protocol, the range of elementary transmission times is sufficient to transmit a quantity of data adequate to constitute information.

[0027] Advantageously, the elementary listening time T4 on each frequency channel is between 10 and 50 milliseconds, preferably between 20 and 40 milliseconds.

[0028] These are classic elementary listening durations of the BLE protocol which allow efficient transmission of information between the transmitting electronic device and the receiving electronic device for an application of this protocol on electronic devices present on transport vehicles.

[0029] Advantageously, the total emission time of the electronic transmitting device does not exceed a multiple A of the lowest common multiple of the periods whose frequencies are Fl and F3, A being an integer less than five, preferably an integer less than three.

[0030] The transmission of information follows a cyclical sequence at a frequency Fl, and the listening also follows a cyclical sequence at a frequency F3. During a time period whose period is an integer multiple of the least common multiple of the periods with frequencies Fl and F3, the transmission and listening sequences are combined differently. Beyond this period, the same sequence is repeated. Synchronization of transmission and reception sequences, which corresponds to temporal coupling redundancy. While this redundancy can be advantageous, particularly when the electronic transmission and reception devices are mobile relative to each other, to statistically ensure a more favorable coupling moment over one duration rather than another, it is not necessary to multiply the redundancies in order to save the energy required to transmit the radio signals carrying the information.

[0031] The invention also relates to a radio frequency transmission system for information between an electronic transmitting device and an electronic listening device, the radio frequency transmission being carried out according to a first sequence on at least two different frequency channels in a cyclic manner, the transmission of information on the at least two frequency channels being equally distributed and alternating between the at least two frequency channels, the first sequence having a frequency Fl, the elementary transmission of information on each frequency channel being carried out over a duration T2, the first sequence comprising a first transmission phase of a duration T5 followed by a second silent phase of a duration T6, the radio frequency listening being carried out according to a second cyclic sequence at a frequency F3 which is greater than the frequency Fl, the listening on the at least two frequency channels being equally distributed according to a pre-established order,the elementary listening on each channel taking place over a duration T4, the duration T5 of the first transmission phase on the at least two channels being greater than or equal to half the duration T4 of elementary listening on each frequency channel, comprising: , • An electronic transmission device comprising an electrical signal generator coupled to a radio antenna and an electrical energy source, the electrical signal generator controlling the elementary duration T2 of transmission on the various frequency channels, the duration of the transmission phase T5, the arrangement of the elementary durations on the various frequency channels during the transmission phase, the duration T6 of the mute phase and the frequency Fl of the first sequence; • An electronic receiving device comprising a radio antenna coupled to an electrical signal receiver and a control module, the control module controlling the elementary listening time T4 on each frequency channel, the arrangement of the elementary listening times on the various frequency channels of the second sequence and the frequency F3 of the second sequence.

[0032] According to a specific embodiment, the electronic emission device is positioned on a rotating part of a vehicle, preferably on a mounted assembly of the vehicle.

[0033] According to a particular embodiment, the electronic listening device is positioned on a fixed part of the vehicle.

[0034] The implementation of the radio frequency transmission method of information between an electronic transmitting device and an electronic listening device according to the invention requires a system comprising at least one electronic transmitting device and one electronic listening device.

[0035] On the one hand, the electronic transmitting device, which must autonomously emit a radio frequency signal carrying the information, must be equipped with a power source, an electrical signal generator coupled to a radio antenna that transforms electrical waves into radio frequency waves. The electrical signal generator controls the various parameters of the first radio frequency transmission sequence, which are the frequency Fl of the cyclic transmission sequence, the elementary duration T2 on each frequency channel, the duration T5 of the transmission phase, and the duration Tô of the silent phase of the transmission sequence.

[0036] On the other hand, the electronic listening device designed to receive the radio frequency signal carrying the information includes a radio antenna that transforms the received radio frequency waves into electrical signals. It also includes an electrical signal receiver that translates the received electrical signals into usable information. Finally, it includes a control module that manages the listening time unit T4 on each frequency channel, the arrangement of these listening time units T4 on the listening frame, and the frequency F3 of the listening sequence.

[0037] A specific application of the method is the transmission of information from an electronic device located on a moving part of the vehicle. In this case, the transmitting electronic device must be located within the moving part of the vehicle, such as, for example, an axle assembly. The position of the receiving electronic device may be on the vehicle or outside of it, such as, for example, a reading gantry placed on the ground near the vehicle.

[0038] But, the system can also be fully installed on the vehicle; in particular, the electronic listening device can be installed on the fixed part of the vehicle to inform the vehicle of the transmitted information or to process the received information to feed other functionalities or devices requiring knowledge of the transmitted information.

[0039] Regardless of how the system is implemented on the vehicle, whether partially or fully integrated, and whether the vehicle is stationary or in motion, the system and the process it implements are operational. If necessary, the parameters may need to be adjusted according to the vehicle's operating mode to improve their efficiency. Brief description of the drawings

[0040] The invention will be better understood upon reading the following description, given solely by way of non-limiting example and made with reference to the accompanying figures in which the same reference numbers designate identical parts throughout and in which: • Fig. 1 presents a view of a transport vehicle equipped with a radio frequency transmission system for information between an electronic transmitting device and an electronic listening device. • Fig. 2 presents a perspective view of a cross-section of a tire equipped with an electronic emission device according to the invention. • Fig. 3 presents a cross-sectional view of an electronic emission device of the invention. • Fig. 4 presents a synoptic diagram of the radio frequency transmission method of information between an electronic transmitting device and an electronic listening device according to the invention. • Figures 5a, 5b, and 5c present examples of the sequence.

[0041] Figure 1 shows a transport vehicle 10 equipped with two axles, one located at the front of the vehicle following its forward movement and the other at the rear. Each axle is equipped with two mounted assemblies, of which only the mounted assembly 100 located on the left side of the vehicle in forward motion in the driver's frame of reference of vehicle 10 is shown. These mounted assemblies 100 consist of a mounted pneumatic tire inflated on a wheel. Each assembled unit 100, here the pneumatic casing, is equipped with an electronic emission device 1, which in this case will be called TMS (acronym in English for Tyre Mounted System), which is fixed by a patch on the inner surface of the pneumatic casing and which is therefore able to rotate in conjunction with the tire around the natural axis of rotation of the assembled unit.Of course, this electronic emission device could just as easily be fixed to the valve of the assembly or to the wheel rim. Therefore, the spatial position of the electronic emission device 1 changes over time relative to any fixed point of the vehicle 10 when the vehicle 10 is moving normally.

[0042] The vehicle 10 includes a radio frequency transmission system 50 for information between an electronic transmitting device 1, which is here the TMS, and an electronic listening device 20, which corresponds to the radio frequency unit fixed to the floor of the vehicle 10. This is a use case of a radio frequency transmission system for information between an electronic transmitting device and an electronic listening device when the system is fully installed on the transport vehicle 10. Here, the TMS 1 transmits information by radio communication to the unit 20, such as a unique identifier of the envelope. pneumatic, the unique identifier of the electronic device or one of its components or response signals from a sensor forming part of the transmitting radio frequency device 1 such as time-domain pressure or temperature signals of the mounted assembly or signals sensitive to deformation of the pneumatic envelope of the mounted assembly such as acceleration, deformation, displacement.

[0043] Figure 2 shows a cross-section of part of an assembled unit equipped with a electronic emission device 1.

[0044] The assembled unit comprises a tire 100 having a vertex S extending into two sides F and terminating in two ribs B. In this case, the tire or tire 100 is intended to be mounted on a wheel, which is not shown in this figure, at the level of the two ribs B to form the assembled unit. This defines a closed cavity, containing at least one pressurized fluid, delimited both by the radially inner surface 130 of the tire 100 and by the outer surface of the wheel. The tire 100 also includes a surface 140 radially external to the tire 100.

[0045] The reference axis 201, corresponding to the reference axis or natural axis of rotation of the tire 100, and the median plane 211, perpendicular to the reference axis 201 and equidistant from the two bead ribs B, shall be noted. The intersection of the reference axis 201 by the median plane 211 determines the center of the tire 200. A Cartesian coordinate system shall be defined at the center of the tire 200 consisting of the reference axis 201, a vertical axis 203 perpendicular to the ground and a longitudinal axis 202 perpendicular to the other two axes. And, we will define the axial plane 212 passing through the reference axis 201 and the longitudinal axis 202, parallel to the point of view of the ground and perpendicular to the median plane 211. Finally, we will call the vertical plane 213 the plane perpendicular to both the median plane 211 and the axial plane 212 passing through the vertical axis 203.

[0046] Every material point of the tire 100 is uniquely defined by its cylindrical coordinates (Y, R, O). The scalar Y represents the axial distance to the center of the tire 200 in the direction of the reference axis 201 defined by the orthogonal projection of the material point of the tire 100 onto the reference axis 201. A radial plane 214 is defined making an angle of O with respect to the vertical plane 213 around the reference axis 201. The material point of the tire 100 is located in this radial plane 214 by the distance R to the center of the tire 200 in the direction perpendicular to the reference axis 201 identified by the orthogonal projection of this material point onto the radial axis 204. The unit vector perpendicular to the radial plane 214 and forming a right-handed trihedron with the Unit vectors of the axial direction 201 and radial direction 204 represent the circumferential direction of the pneumatic envelope 100.

[0047] This tire 100 has on its radially inner surface 130 a fastening device 50 which is attached to the surface 130 by bonding according to conventional prior art techniques when the fastening device 50 is made of elastomeric material. The fastening device 50 is fixed at the apex S of the tire casing 100, which improves its durability since the fastening device thus positioned causes fewer problems during the mounting or dismounting of the wheel on the tire casing 100. Indeed, the fastening device 50 is located in an area away from the ridges B of the tire casing 100. Here, the fastening device 50 is equipped with a radio frequency electronic device 1 within its open volume which constitutes a housing adapted to receive the electronic device.The electronic device 1 can perform various functions such as identifying certain components like the electronic element itself or the pneumatic system. This information is transmitted via radio frequency communication.

[0048] However, the electronic device 1 can also be equipped with a pressure and / or temperature sensor to evaluate the inflation pressure of the assembled tire. Finally, it can also be equipped with a sensor that directly measures the curvature of the tire, such as an accelerometer or a flexometer, allowing the determination of tire usage parameters such as angular velocity, mileage, and applied static load. All or some of these parameters make it possible to identify tire performance characteristics such as wear, grip, or intrinsic properties of the surface on which the tire travels. For its radio frequency communication, the electronic device is equipped with a radio antenna coupled to an electrical signal generator powered by an energy source.

[0049] Fig. 3 presents a cross-section of an example of an electronic system 1 for pneumatics enabling the radio frequency transmission of information to a listening device.

[0050] This electronic device 1 is composed in this example of an encapsulation device comprising a sub-component 120 and a rigid housing 101, and electronic elements constituting the electronic board, the latter comprising a printed circuit 5 on which are positioned a fluid physical parameter measurement sensor 2, a microprocessor 3, a battery 4 and a radio antenna 7.

[0051] The electronic components are located inside the encapsulation device, having been previously positioned on the rigid housing 101 by means of a system of ribs in the rigid housing 101. If the microprocessor 3, the measuring sensor 2 and the radio antenna 7 are soldered to the printed circuit board 5 using standard state-of-the-art techniques. A battery is attached to the printed circuit board by a system of conductive arms soldered to the printed circuit board 5. These arms clamp the battery to form the battery 4. The microprocessor 3 controls both the sensor 2 to initiate the measurement acquisition by the sensor 2 and retrieve the output signals from the sensor 2, and also the radio frequency transmission by generating the electrical signals from the electrical energy of the battery 4 and sending said electrical signals to the radio antenna 7. Here, the radio transmission takes place in the UHF (Ultra High Frequency) frequency range, preferably around 2.4 GHz.

[0052] The subcomponent 120 comprises a rigid housing 300 and an elastic seal 150. This subcomponent 120 is arranged relative to the rigid housing 101, which previously housed the electronic board, such that the free surface of the elastic seal 150 is aligned with the active portion of the measuring sensor 2 on the electronic board. A compressive force is then applied axially to the subcomponent 120 in the direction of the rigid housing 101. This force compresses the elastic seal, which has the lowest rigidity in the assembly, to ensure a compression of at least 20% of the radial free height of the seal 150. This compression ratio ensures a seal of the seal with respect to the measuring sensor 2 and, consequently, of the entire electronic board with respect to the through-hole of the elastic seal 150.

[0053] Finally, a continuous weld 160 is made around the entire periphery of the encapsulation device, maintaining the compressive force between the subcomponent 120 and the rigid housing 101 at the contour defined by the shoulder laterally external to the rigid housing 300. This weld 160 also ensures the sealing of the electronic system 1 against the external environment. Furthermore, it ensures the tamper-proof nature of the electronic components contained within the electronic device 1. Only the destruction of the weld 160, and consequently of the encapsulation device, allows for the extraction of the electronic components.

[0054] The electronic device 1 is capable of transmitting by radio communication information contained in a memory space of the microprocessor 3 such as an identifier of a component of the electronic device 1 or a part of the signals of the sensor 2 after a digital conversion of these and transcription of the digital information into electrical signals by the microprocessor 3.

[0055] Figure 4 illustrates a block diagram of the radio frequency transmission method of a information between an electronic transmitting device and an electronic listening device with the aim of transmitting information efficiently at the lowest energy cost.

[0056] The method comprises the following steps. The first step, 1001, is to determine the radio frequency communication listening parameters of the electronic listening device. More specifically, those that are necessary are in bold, and those that are optional for improving the method are written differently. Among the essential parameters is the elementary listening time T4 per radio communication channel. Generally, listening takes place on at least two frequency channels and must be equally distributed between all channels. Therefore, the simplest solution is for each communication channel to have the same elementary listening time T4. Of course, it is essential to know the communication frequencies of these listening channels so that the information is transmitted on these same communication frequencies.

[0057] Next, since listening is cyclic, it is necessary to know the frequency F3 of this cycle during this step 1001. Optionally, one can also specify the duration T7 of the silent period following the duration T4 of the elementary listening on a channel to optimize the transmission of information.

[0058] The second step 1002 consists of defining the strategy for emitting information on a sequence knowing the parameters determined in step 1001.

[0059] Thus, starting from the elementary transmission duration T2 on a communication channel, which is partly determined by the volume of information to be transmitted and the frequency of the communication channel, it is necessary to define the transmission duration T5 of the information on the various communication channels during the sequence, knowing that this transmission duration T5 is conditioned by the elementary listening duration T4 of the electronic listening device. Finally, depending on the application considered, it is necessary to adapt the arrangement of the elementary transmissions of the various channels, in particular, the repetition of elementary transmissions of the same channel and the periodicity of transmissions between the various communication channels during the transmission duration T5 of the sequence. The arrangement of the transmissions during the duration T5 governs the efficiency of the information transmission to the receiving electronic device.Optionally, it is possible to optimize the transmission duration T5 according to the silent duration T7 of the electronic listening device.

[0060] Finally, during this step 1002, it is preferable to define the duration T6 of the mute period following the emission period in order to minimize the energy consumption of the emission. However, this mute duration T6 is strongly linked to the frequency Fl of the cycle of the sequence that one wishes to implement, especially if the sequence is divided into only two phases, the emission phase followed by the mute phase.

[0061] During step 1003, the frequency Fl of the transmission sequences is chosen, which must necessarily be lower than the listening frequency F3 in order to save Energy. Finally, in this step 1003, we define the maximum total transmission time, which is capped by a threshold Ttot defined as an integer multiple A of the least common multiple of the inverses of the transmission frequency Fl and the listening frequency F3 of the communication system. Indeed, beyond the duration corresponding to the least common multiple of the inverses of the frequencies Fl and F3, the coupling between transmission and listening is inevitably repeated. This repetition can be beneficial, particularly if the spatial position between the electronic transmission device and the electronic listening device changes over time, to avoid areas of poor or no communication. However, statistically, these repetitions are only meaningful for a limited number of repetitions, and this saves energy for the radio frequency transmission device.Furthermore, it is possible to limit the duration of radio frequency transmission; for example, using a fixed value, for reasons of energy consumption rationalization. It will then be necessary to take the limit value, the maximum value Ttot, or a combination of the two values ​​to define the transmission time.

[0062] The last step 1004 is to implement the radio frequency emission thus defined according to the application case, that is to say the relative spatial position over time between the electronic transmitting device and the electronic listening device, which makes it possible to efficiently transmit the information from the electronic transmitting device to the electronic listening device while being economical in electrical energy.

[0063] Figures 5a to c are the results of the success rate of information transmission from the transmitting electronic device to the receiving electronic device, assuming that the spatial position separating the two devices is fixed over time. Each graph corresponds to a different transmission sequence for the same listening sequence.

[0064] Figure 5a shows, represented temporally on line 2001, the listening sequence of the receiving electronic device. In this example, information is received on three communication channels whose center frequency varies between the different channels. Each communication channel is represented by a gray level corresponding to the frequency of the communication channel. The listening sequence is equally distributed among the three communication channels, each of which has a common listening duration T4. Between two communication channels, a silent phase of duration T7 occurs, which is, in this case, longer than the listening duration T4. The listening sequence is cyclic with a period F3. Thin vertical lines, perpendicular to line 2001, delimit the various parameters of the listening sequence: T4, T7, F3.

[0065] The transmission sequence of a state-of-the-art electronic transmitting device is visualized and represented temporally on line 2002. This transmission sequence takes place on three communication channels whose frequencies correspond to the frequencies of the communication channels of the receiving device. Therefore, each communication channel is represented by a shade of gray to distinguish them, and the same shades of gray are used between lines 2001 and 2002.

[0066] The transmission sequence is characterized by a transmission phase of duration T5 on the three communication channels. This phase is continuous, meaning that the time elapsed between the end of transmission on one communication channel and the beginning of transmission on the next channel is less than the elementary transmission duration T2 on each channel. The transmission phase is equally distributed across the three communication channels. Following the transmission phase of duration T5, a silent phase of duration T6 occurs. This sequence is repeated at a frequency F3. Here, the transmission phase is short, comprising only one transmission on each communication channel before the silent phase. Furthermore, the frequency F3 of the sequence is lower than the frequency F1 of the listening sequence of the receiving electronic device. Finally, the transmission duration T5 of the sequence is less than half the elementary listening duration T4 of the receiving electronic device.Thin vertical lines, perpendicular to line 2002, delimit the various parameters of the emission sequence; T5, T6, FL.

[0067] The success of the information transmission from the transmitting device to the receiving device over the same communication channel is visualized and represented temporally on line 2003. The correspondence is visualized by a vertical bold dashed line that is perpendicular to and intersects lines 2001, 2002, and 2003. The elementary duration T2 of communication between the two devices is represented on a rectangular shape with oblique black and white fill.

[0068] Here, on line 2002, we observe that of the seven phases of information transmission by the transmitting electronic device, only three were captured by the receiving electronic device, as evidenced by the number of oblique rectangular shapes on line 2003. In conclusion, for a transmission of this type, relative to the listening parameters of the receiving electronic device, less than half of the radio frequency transmission resulted in the transmission of information to the receiving electronic device, which is the core of the technical problem of the invention. By imitation, more than half of the energy used for the information transmission was wasted.

[0069] Figure 5b illustrates the success rate of another radio frequency transmission sequence on the same electronic device transmitting to the same device. listening electronics. Compared to [Fig.5a], only lines 2002 and 2003 differ.

[0070] Line 2002 shows the transmission sequence used in this example. Here, the transmission phase of duration T5 is first of all greater than half the elementary listening duration T4 on each communication channel of the receiving electronic device, which is consistent with one of the essential features of the invention. Furthermore, the transmission frequency Fl of the sequence is lower than the listening frequency F3 of the receiving electronic device; this is a second essential feature of the method. As a result, information is transmitted less frequently, but when it is transmitted, its transmission is longer.

[0071] In this particular embodiment, transmission consists of repeating the information on the same communication channel before switching to a different communication channel and repeating the same information on that new channel. This process is repeated across all communication channels. Here, the information is repeated twice on the same channel. Furthermore, the transmission is continuous during the transmission phase, which has a duration of T5. Finally, the transmission duration T5 is less than the sum of the elementary duration T4 and half the duration T7 of the silent phase following the elementary listening.

[0072] As can be seen on line 2003, indicated by the bold dashed lines, of the four transmission phases of duration T5 on line 2002, three enabled communication with the electronic listening device. In conclusion, a clear improvement in the transmission efficiency rate from the electronic transmitting device to the electronic listening device is noted through this modification of the transmission sequence, with the same listening sequence.

[0073] Figure 5c illustrates the success rate of another radio frequency transmission sequence from the same electronic transmitting device to the same electronic listening device. Compared to Figure 5a, only lines 2002 and 2003 differ.

[0074] Line 2002 shows the transmission sequence used in this example. Here, the transmission phase of duration T5 is first of all greater than half the elementary listening duration T4 on each communication channel of the receiving electronic device, which is consistent with one of the essential features of the invention. Furthermore, the transmission frequency Fl of the sequence is lower than the listening frequency F3 of the receiving electronic device; this is a second essential feature of the method. As a result, information is transmitted less frequently, but when it is transmitted, its transmission is longer.

[0075] In this particular embodiment, the emission consists of the cyclical repetition of the same main sequence. This sequence consists of the emission of information across all communication channels in an alternating and equally distributed manner. Here, the main sequence is repeated three times. Furthermore, the transmission is continuous during the transmission phase of duration T5, with the same number of elementary transmissions of duration T2 per communication channel. Finally, the transmission duration T5 is less than the sum of the elementary duration T4 and half the duration T7 of the silent phase following the elementary listening.

[0076] As can be seen on line 2003, indicated by the bold dashed lines, of the four transmission phases of duration T5 on line 2002, all four communicated with the electronic listening device. In conclusion, this modification of the transmission sequence results in maximum efficiency of information transmission from the electronic transmitting device to the electronic listening device, with the same listening sequence.

[0077] Thus, the energy consumed for the transmission of information per emission phase is well consumed since the information is transmitted optimally and the fact of modifying the emission frequency Fl ensures that it is more energy-efficient than the emission phase of the prior art.

Claims

Demands

1. A radio frequency transmission method for information between an electronic transmitting device and an electronic listening device, the radio frequency transmission (1004) being carried out in a first sequence on at least two different frequency channels in a cyclic manner, the transmission between the at least two frequency channels being equally distributed, the first sequence having a frequency Fl, the elementary transmission on each frequency channel being carried out over a duration T2, the radio frequency listening being carried out in a second cyclic sequence at a frequency F3, the listening on the at least two frequency channels being equally distributed according to a pre-established order, the elementary listening on each channel being carried out over a duration T4,comprising the following steps: - Alternating transmission (1004) of information on each of the at least two frequency communication channels characterized in that the first sequence is transmitted at a frequency Fl lower than the frequency F3 of the second sequence, in that the first sequence comprises a first transmission phase of a duration T5 followed by a second silent phase of a duration T6 and in that the duration T5 of the first transmission phase on the at least two channels is greater than or equal to half the elementary listening duration T4 of each listening frequency channel.

2. A radio frequency transmission method of information between an electronic transmitting device and an electronic listening device according to claim 1 wherein the frequency Fl of the first sequence is not an integer multiple of the frequency F3 of the second sequence.

3. A radio frequency transmission method for information between an electronic transmitting device and an electronic listening device according to any one of claims 1 to 2, wherein the first transmission phase links the transmission on at least two frequency channels in an uninterrupted manner for the duration T5.

4. A method for transmitting information by radio frequency between an electronic transmitting device and an electronic listening device according to any one of claims 1 to 3, wherein the radio frequency listening includes a silent phase of duration T7 between two consecutive elementary listening phases of duration T4, the duration T7 of the silent phase being greater than or equal to the duration T4, the duration T5 of emission is less than or equal to the sum of the duration T4 and half of the duration T7.

5. A radio frequency transmission method of information between an electronic transmitting device and an electronic listening device according to any one of claims 1 to 4 wherein the first transmission phase comprises the repetition of the elementary transmission of information m times on one of at least two frequency channels before the same repetition of the elementary transmission of information on the other of at least two frequency channels, m being an integer greater than or equal to two.

6. A method of radio frequency transmission of information between an electronic transmitting device and an electronic listening device according to any one of claims 1 to 5 wherein the first transmission phase comprises a periodic sequence of transmitting information on at least two frequency channels over n periods, n being an integer greater than or equal to two.

7. A method for transmitting information by radio frequency between an electronic transmitting device and an electronic listening device according to any one of claims 1 to 6, wherein the radio frequency transmission is carried out according to a communication protocol operating at 2.4 GHz on forty frequency channels with a frequency width of 2 MHz between 2402 and 2480 MHz.

8. A radio frequency transmission method for information between an electronic transmitting device and an electronic listening device according to any one of claims 1 to 7 wherein the at least two frequency channels are three in number.

9. A radio frequency transmission method for information between an electronic transmitting device and an electronic listening device according to any one of claims 1 to 8 wherein the elementary transmission time T2 on each frequency channel is between 0.2 and 5 milliseconds, preferably between 1 and 3 milliseconds.

10. A method for transmitting information by radio frequency between an electronic transmitting device and an electronic listening device according to any one of claims 1 to 9, wherein the elementary listening time T4 on each frequency channel is included between 10 and 50 milliseconds, preferably between 20 and 40 milliseconds.

11. A radio frequency transmission method of information between an electronic transmitting device and an electronic listening device according to any one of claims 1 to 10 wherein the total transmission time of the electronic transmitting device does not exceed a multiple A of the lowest common multiple of the periods whose frequencies are Fl and F3, A being an integer less than 5, preferably an integer less than 3.

12. Radio frequency transmission system for information between an electronic transmitting device and an electronic listening device, the radio frequency transmission occurring in a first sequence on at least two different frequency channels in a cyclic manner, the transmission of information on the at least two frequency channels being equally distributed and alternating between the at least two frequency channels, the first sequence having a frequency Fl, the elementary transmission of information on each frequency channel occurring over a duration T2, the first sequence comprising a first transmission phase of a duration T5 followed by a second silent phase of a duration T6, the radio frequency listening occurring in a second cyclic sequence at a frequency F3 which is greater than the frequency Fl, the listening on the at least two frequency channels being equally distributed according to a pre-established order,the elementary listening on each channel taking place over a duration T4, the duration T5 of the first transmission phase on the at least two channels being greater than or equal to half the duration T4 of elementary listening on each frequency channel, comprising: • An electronic transmission device (1) comprising an electrical signal generator (3) coupled to a radio antenna and an electrical energy source (4), the electrical signal generator (3) controlling the elementary transmission duration T2 on the various frequency channels, the duration of the transmission phase T5, the arrangement of the elementary durations on the various frequency channels during the transmission phase, the duration T6 of the silent phase and the frequency Fl of the first sequence; • An electronic receiving device comprising a radio antenna coupled to an electrical signal receiver and a control module, the control module controlling the elementary listening time T4 on each frequency channel, the arrangement of the elementary listening times on the various frequency channels of the second sequence and the frequency F3 of the second sequence.

13. Radio frequency transmission system of information between an electronic transmitting device and an electronic listening device according to claim 12 wherein the electronic transmitting device is positioned on a rotating part of a vehicle, preferably on a mounted assembly of the vehicle.

14. Radio frequency transmission system of information between an electronic transmitting device and an electronic listening device according to claim 13 wherein the electronic listening device is positioned on a fixed part of the vehicle.