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    • 专利摘要:
    The present invention relates to a method for locating (P) a user terminal (SP) with respect to a motor vehicle (V) comprising a plurality of electronic units (BA, PE), said user terminal (SP) and the units electronics (BA, PE) being adapted to communicate according to a Bluetooth Low EnergyTM (BLE) communication protocol, according to which said localization method (P) comprises: - a diffusion by each electronic unit (BA, PE) of a plurality of announcement frames (ADV) in at least two advertisement channels (CA), each broadcast advertisement frame (ADV) comprising a primary identification information (FLG1) of an electronic unit (BA, PE) ); - A scan of said at least two announcement channels (CA) by said user terminal (SP) to receive said ad frames (ADV) broadcast; storage of said announcement frames (ADV) by said user terminal (SP) according to said primary identification information (FLG1); a measurement of the reception power (RSSI) by said user terminal (SP) of said stored announcement frames (ADV); for each electronic unit (BA, PE), a determination of the distance (D) at which the user terminal (SP) of the motor vehicle (V) is located as a function of said reception power measurements (RSSI); a calculation of the position (POS) of the user terminal (SP) with respect to the motor vehicle (V) as a function of the distances (D) determined for each electronic unit (BA, PE).
    公开号:FR3061308A1
    申请号:FR1663310
    申请日:2016-12-23
    公开日:2018-06-29
    发明作者:Laurent Petel；Christophe GUEBLE
    申请人:Valeo Comfort and Driving Assistance SAS；
    IPC主号:
    专利说明:

    ® Agent (s): VALEO COMFORT AND DRIVING ASSISTANCE.
    ® METHOD FOR LOCATING A USER TERMINAL IN RELATION TO A MOTOR VEHICLE.
    FR 3 061 308 - A1
    @) The present invention relates to a method for locating (P) a user terminal (SP) relative to a motor vehicle (V) comprising a plurality of electronic units (BA, PE), said user terminal (SP) and the electronic units (BA, PE) being adapted to communicate according to a Bluetooth Low Energy ™ communication protocol (BLE), according to which said location method (P) comprises:
    a broadcast by each electronic unit (BA, PE) of a plurality of announcement frames (ADV) within at least two announcement channels (CA), each announcement frame (ADV) broadcast comprising a primary identification information (FLG1) of an electronic unit (BA, PE);
    - a scanning of said at least two announcement channels (CA) by said user terminal (SP) to receive said broadcast announcement frames (ADV);
    - a storage of said announcement frames (ADV) by said user terminal (SP) according to said primary identification information (FLG1);
    - a measurement of the reception power (RSSI) by said user terminal (SP) of said stored announcement frames (ADV);
    - for each electronic unit (BA, PE), a determination of the distance (D) at which said user terminal (SP) of the motor vehicle (V) is located as a function of said measurements of reception powers (RSSI);
    - a calculation of the position (POS) of the user terminal (SP) relative to the motor vehicle (V) as a function of the distances (D) determined for each electronic unit (BA, PE).
    METHOD FOR LOCATING A USER TERMINAL BY
    RELATION TO A MOTOR VEHICLE
    TECHNICAL FIELD OF THE INVENTION
    The present invention relates to a method of locating a user terminal relative to a motor vehicle.
    The present invention also relates to a system for locating a user terminal with respect to an associated motor vehicle.
    It finds a particular but not limiting application in the field of motor vehicles.
    TECHNOLOGICAL BACKGROUND OF THE INVENTION
    In the field of motor vehicles, there are methods of locating a user terminal relative to a motor vehicle. These systems are based on exchanges between one or more units arranged in the vehicle and the user terminal.
    It is known for this location to use exchanges of the low frequency type or of the ultra wide band, ultra wide band (UWB) type in English.
    When the user terminal is of the smartphone type, this type of exchange is not available as standard, and it is therefore necessary, in addition to the devices to be installed on the vehicle, to transform the user terminal.
    GENERAL DESCRIPTION OF THE INVENTION
    To this end, the invention provides a method of locating a user terminal with respect to a motor vehicle comprising a plurality of electronic units, said user terminal and the electronic units being adapted to communicate according to a Bluetooth Low Energy communication protocol. ™, according to which said localization method comprises:
    a broadcast by each electronic unit of a plurality of announcement frames within at least two announcement channels, each broadcast announcement frame comprising primary identification information of an electronic unit;
    - a scanning of said at least two announcement channels by said user terminal to receive said broadcast announcement frames;
    - storage of said announcement frames by said user terminal according to said primary identification information;
    - a measurement of the power received by said user terminal of said stored announcement frames;
    - For each electronic unit, a determination of the distance at which said user terminal of the motor vehicle is located as a function of said measurements of powers on reception;
    - a calculation of the position of the user terminal relative to the motor vehicle as a function of the distances determined for each electronic unit.
    According to non-limiting embodiments, the location method can also include one or more additional characteristics among the following.
    - each broadcast announcement frame also includes secondary identification information of the announcement channel used, said secondary identification information being stored by the user terminal;
    - a measurement of the power received by said user terminal of said stored ad frames;
    Thus, as will be seen in detail later, thanks to the secondary identification information, it is possible to sort between the announcement frames broadcast for each announcement channel of each electronic unit. This will allow us to have a measurement of the power at reception of each precise announcement frame.
    According to a non-limiting embodiment, for each electronic unit, an announcement channel is taken as the reference channel and the location method further comprises:
    dynamic normalization of the measurement of the power on reception of an announcement frame of an announcement channel with respect to the measurement of the power on reception of an announcement frame of the reference channel as a function of 'a compensation value.
    According to a nonlimiting embodiment, said secondary identification information is a counter, said counter being incremented as a function of the announcement channel used.
    According to a nonlimiting embodiment, said at least two announcement channels are distributed over a frequency band of 2.4 GHz.
    According to a nonlimiting embodiment, the motor vehicle comprises at least two electronic units.
    According to a nonlimiting embodiment, said scanning of said at least two announcement channels is carried out sequentially and according to a secondary period.
    According to a nonlimiting embodiment, the broadcasting by each electronic unit of an announcement frame on said at least two announcement channels is carried out sequentially and according to a primary period less than said secondary period.
    According to a nonlimiting embodiment, the primary period is substantially equal to one hundred milliseconds.
    According to a nonlimiting embodiment, according to which the secondary period is substantially equal to five seconds.
    According to a nonlimiting embodiment, the user terminal is a mobile telephone, an identifier, a badge, a tablet.
    According to a nonlimiting embodiment, said electronic unit is a beacon.
    According to a nonlimiting embodiment, the determination of said distance and / or the calculation of the position of the user terminal is carried out by said user terminal or an electronic unit of said motor vehicle.
    There is also proposed a method of broadcasting by a plurality of announcement frame beacons, said electronic units and said user terminal being adapted to communicate according to a Bluetooth Low Energy ™ communication protocol, according to which said broadcasting method comprises:
    a broadcast by each electronic unit of a plurality of announcement frames within at least two announcement channels, each announcement frame broadcast comprising primary identification information of an electronic unit and information of secondary identification of the announcement channel used.
    There is also proposed a user terminal adapted to communicate according to a Bluetooth Low Energy communication protocol with a plurality of electronic units of a motor vehicle, according to which said user terminal is suitable for:
    - scanning at least two announcement channels to receive said announcement frames broadcast on said at least two announcement channels, each announcement frame broadcast comprising primary identification information of an electronic unit and information of secondary identification of the announcement channel used;
    - store said announcement frames as a function of said primary identification information and said secondary identification information;
    - measure the power received from the announcement frames of each announcement channel.
    According to a nonlimiting embodiment, said user terminal is further adapted for:
    - For each electronic unit, determine the distance at which said user terminal of the motor vehicle is based on said measurements of power in reception and calculate the position of the user terminal relative to the motor vehicle according to the distances determined for each electronic unit; or
    - send said power measurements on reception to an electronic unit of said motor vehicle.
    According to a nonlimiting embodiment, for each electronic unit an announcement channel is taken as the reference channel and according to which said user terminal is further adapted to perform dynamic normalization of the measurement of the power on reception of a frame. announcement channel of an announcement channel with respect to the measurement of the reception power of a reference channel announcement frame as a function of a compensation value.
    There is also proposed an electronic unit for a motor vehicle adapted to communicate according to a Bluetooth Low Energy communication protocol with a user terminal, according to which said electronic unit is suitable for:
    - broadcast a plurality of announcement frames within at least two announcement channels, each broadcast announcement frame comprising primary identification information of an electronic unit and secondary identification information of the channel ad used.
    A location system is also proposed (of a user terminal relative to a motor vehicle comprising a plurality of electronic units, said user terminal and said electronic units being adapted to communicate according to a Bluetooth Low Energy ™ communication protocol, according to which said system (SYS) comprises:
    - said electronic unit adapted for:
    broadcast a plurality of announcement frames (ADV) within at least two announcement channels, each broadcast announcement frame comprising primary identification information from an electronic unit and secondary identification information ( FLG2) of the announcement channel (CA) used;
    - said user terminal adapted for:
    - scanning said at least two announcement channels to receive said broadcast announcement frames;
    - store said announcement frames as a function of said secondary identification information;
    - measure the power received from the announcement frames of each announcement channel.
    According to a nonlimiting embodiment, said user terminal is further adapted for:
    - For each electronic unit, determining the distance at which said user terminal of the motor vehicle is based on said measurements of power in reception and calculating the position of the user terminal relative to the motor vehicle according to the determined distances from each electronic unit; or
    - send said power measurements on reception to an electronic unit of said motor vehicle.
    According to a nonlimiting embodiment, the motor vehicle comprises eight electronic units.
    According to a nonlimiting embodiment, the determination of the position is carried out by triangulation.
    BRIEF DESCRIPTION OF THE FIGURES
    The invention and its different applications will be better understood on reading the description which follows and on examining the figures which accompany it.
    - Figure 1 shows a diagram of a location system of a user terminal with respect to a motor vehicle adapted to implement a location method, according to a non-limiting embodiment of the invention, said location system comprising a plurality of electronic units;
    - Figure 2 shows a diagram of three channels on which an announcement frame can be broadcast according to the location method of Figure 1, an annone frame comprising secondary identification information of the channel used according to different embodiments not limiting;
    - Figure 3 shows a diagram of a motor vehicle comprising a plurality of electronic units and a user terminal adapted to receive announcement frames from said electronic units;
    - Figure 4 shows a diagram of a method for locating a user terminal relative to a motor vehicle according to a non-limiting embodiment of the invention and implemented by the location system of Figure 1;
    - Figure 5 shows a diagram illustrating the broadcasting of announcement frames on three different channels and their reception by a user terminal according to the location method of Figure 4, according to a non-limiting embodiment; and
    - Figure 6 shows a diagram of ad frames broadcast by an electronic unit and received by a user terminal and their reception power measurement performed according to the location method of Figure 4, according to a non-limiting embodiment.
    DESCRIPTION OF EMBODIMENTS OF THE INVENTION
    Identical elements, by structure or by function, appearing in different figures keep, unless otherwise specified, the same references.
    The invention relates to a location method P of a user terminal SP with respect to a motor vehicle V and an associated location system SYS.
    The localization method P is implemented by the localization system SYS of a user terminal SP with respect to a motor vehicle V comprising a plurality of electronic units BA, PE, said user terminal SP and the electronic units BA, PE being adapted to communicate using a Bluetooth Low Energy ™ communication protocol referenced BLE. The BLE protocol allows bidirectional data exchange at very short distance. It uses radio waves called RF on a frequency band of 2.4GH.
    Figure 1 illustrates said SYS location system.
    The SYS system includes:
    - a plurality of BA, PE electronic units. In Figure 1, an electronic unit BA, PE is shown; and
    - said user terminal SP.
    For the remainder of the description, the term device will be used to indicate a user terminal SP or an electronic unit BA, PE.
    The elements of said SYS system are described in detail below.
    A user can control the execution of an Fct function using the user terminal SP. In nonlimiting embodiments, the function Fct is a locking / unlocking of the motor vehicle V to access said motor vehicle V or a starting of the motor vehicle V.
    In nonlimiting examples, the user terminal SP is an identifier, a badge, a tablet, a mobile phone such as in a nonlimiting example a so-called smart phone (“Smartphone in English”) used by a user of the motor vehicle V.
    In a nonlimiting embodiment, the user terminal SP uses Bluetooth Low Energy ™ technology to communicate with the motor vehicle V, whether for access to the vehicle, that is to say to open / close an opening of the vehicle (door or trunk), or for starting the vehicle. The procedure for accessing a motor vehicle or starting via a user terminal SP being well known to those skilled in the art, it is not described here.
    For security reasons, the execution of a function Fct of the motor vehicle V is conditioned by the location of the user terminal SP relative to the motor vehicle V, namely by the distance D at which it is located relative to the motor vehicle V. In a nonlimiting example, the motor vehicle V can be unlocked when the user terminal SP is close to the motor vehicle V, at a distance substantially equal to 50 cm (centimeters).
    The measurement of a distance D between the user terminal SP and the motor vehicle V is carried out by means of the measurement of the power of a received signal whose initial power is known, namely the power on transmission of said signal is known, which makes it possible to deduce the distance between the transmitter and the receiver. The transmitter here is an electronic unit BA, PE of the motor vehicle V and the receiver is the user terminal SP.
    This method is called measurement by RSSI (in English "Received Signal Strength Indication"). To improve the measurement of the distance, a plurality of electronic units BA, PE are used and a triangulation is carried out on the different power measurements of the signals received.
    In a nonlimiting embodiment, the electronic unit is a beacon BA or a central electronic unit PE (also called central transceiver or "central transceiver" in English) as illustrated in FIG. 3.
    In a nonlimiting embodiment taken in the following description, three beacons BA1, BA2, BA3 are used as illustrated in FIG. 3. The three beacons BA1, BA2, BA3 are distributed all around the motor vehicle V, a right side and a left side of the motor vehicle (for example at the level of each door) and one at the rear of the motor vehicle (for example in the boot or tailgate of the motor vehicle V). In another nonlimiting embodiment, eight tags are used. This makes it possible to cover the corners of the motor vehicle V. Thus, in a nonlimiting example, we will have a beacon on the right side, a left side, a right rear, a left rear, a middle rear, a left front, a right front, one before middle.
    As will be seen below, the signals received by the user terminal SP are announcement frames ADV sent by the beacons BA.
    As illustrated in FIG. 1, the user terminal SP includes:
    - an MC1 wireless communication module. A wireless communication module MC1 thus comprises a BLE antenna which serves as a transmitter / receiver;
    - a storage unit MEM1. In a nonlimiting example, the storage unit is a non-volatile rewritable EEPROM memory;
    - a PRO1 processor.
    The processor PRO1 is adapted to execute instructions for the implementation of scanning, storage, measurement steps (method P2 illustrated in FIG. 4) described below.
    A BA tag includes:
    - an MC2 wireless communication module. A wireless communication module MC2 thus comprises a BLE antenna which serves as a transmitter / receiver;
    - a MEM2 storage unit. In a nonlimiting example, the storage unit is a non-volatile rewritable EEPROM memory;
    - a PRO2 processor.
    The processor PRO2 is adapted to execute instructions for the implementation of a diffusion step (method P1 illustrated in FIG. 4) described below.
    The wireless communication module MC1 of the user terminal SP makes it possible to establish a wireless link (here “Bluetooth Low Energy ™”) with the wireless communication module MC2 of a beacon BA of the motor vehicle V.
    The wireless communication module MC2 of the BA beacon is adapted to be in a broadcasting mode (advertising mode in Bluetooth technology). In this case, it is suitable for broadcasting a plurality of ADV announcement frames within specific channels, called CA announcement channels (in English advertising channels) distinct from the data channels (in English: data channels) used to transmit application data exchange frames relating to established connections.
    The wireless communication module MC1 of the user terminal SP is adapted to be in a scanning mode (scanning mode in Bluetooth technology). To this end, it is suitable for scanning said CA announcement channels to receive said broadcast ADV announcement frames. The scanning is sequential. He listens to an announcement channel, then another etc. It listens in order or out of order.
    The BLE protocol provides 3 announcement channels CA1, CA2, CA3 illustrated in FIG. 1 and FIG. 2, referenced channel 37, channel 38 and channel 39 according to the BLE protocol and having respective center frequencies equal to 2402 MHz, 2426 MHz , 2480 MHz, and 37 data channels (referenced channel 0 to channel 36). The three announcement channels CA1, CA2, CA3 are distributed on the 2.4 GHz frequency band. Thus the 3 announcement channels CA1, CA2, CA3 respectively have central frequencies located at the lower end, in a central region and at the upper end of the frequency band concerned (here the 2.4 GHz band) .
    A BA tag is adapted to broadcast a plurality of ADV announcement frames within at least two CA announcement channels, each broadcast AV announcement frame comprising primary identification information FLG1 of a BA tag.
    In an advantageous embodiment each broadcast announcement frame AV can also include secondary identification information FLG2 of the announcement channel CA used (function illustrated in FIG. 1 BRD (BA, ADV (FLG1, FLG2), PUtx, IT).
    In a nonlimiting embodiment, three announcement channels CA1, CA2,
    CA3 are used. This embodiment is taken as a nonlimiting example for the remainder of the description.
    Thus, as illustrated in Figure 3:
    - the BA1 tag is adapted to broadcast a plurality of ADV1 announcement frames on the three announcement channels CA1, CA2 and CA3;
    the BA2 beacon is adapted to broadcast a plurality of ADV2 announcement frames on the three announcement channels CA1, CA2 and CA3; and
    - the BA3 tag is adapted to broadcast a plurality of ADV3 announcement frames on the three announcement channels CA1, CA2, CA3 illustrated in the figure
    2.
    A BA tag thus sends the same ADV announcement frame several times sequentially on the three announcement channels CA1, CA2, CA3. It can do this in the order of the announcement channels CA1, CA2, CA3 or out of order. In addition to the primary FLG1 and secondary FLG2 identification information, this ADV announcement frame includes INF information which indicates:
    - that the BA tag can be connected or not with another device;
    - the transmit power PUtx of the ADV announcement frame;
    - the position of the BA tag on the motor vehicle V. In nonlimiting examples, the position is:
    - front right at a door;
    - front left at a door;
    - rear right at a door;
    - rear left at a door;
    - at the rear at the level of the boot or the tailgate;
    - front right at the level of a tire;
    - front left at the level of a tire;
    - rear right at the level of a tire;
    - rear left at tire level etc.
    ADV ad frames being known to those skilled in the art, they are not described in more detail.
    In a nonlimiting embodiment, a BA tag is in a so-called non-connectable mode, it cannot establish a connection with the user terminal SP. It just broadcasts ADV ad frames. It does not need to connect to the user terminal SP.
    The primary identification information FLG1 and the secondary identification information FLG2 allow the user terminal SP to sort and store an announcement frame ADV broadcast according to the beacon BA which broadcasts it, and the announcement channel CA used, namely on which it is broadcast.
    In a nonlimiting embodiment, the primary identification information FLG1 is a number between 1 and 3 assigned respectively to the tag BA1, BA2 and BA3. Thus, the primary identification information FLG1 makes it possible to differentiate the BA tag which broadcasts an ADV announcement frame.
    In a nonlimiting embodiment, the secondary identification information FLG2 is a counter, said counter being incremented as a function of the announcement channel CA used. There is thus a byte dedicated to this effect in the ADV announcement frame. Thus, as can be seen in FIG. 2, in nonlimiting embodiments:
    - the FLG2 counter is initialized to 0 and incremented by 1 for the next channel. The secondary identification information FLG2 is therefore equal to 0x00 in hexadecimal for the channel CA1,0x01 for the channel CA2 and 0x02 for the channel CA3; or
    - the FLG2 counter is initialized to 1 and incremented by 1 for the next channel. The secondary identification information FLG2 is therefore equal to 0x01 in hexadecimal for the channel CA1,0x02 for the channel CA2 and 0x03 for the channel CA3; or
    - the FLG2 counter is initialized to 1 and incremented by 1 for the next channel then 2 for the next channel. The secondary identification information FLG2 is therefore equal to 0x01 in hexadecimal for the channel CA1,0x02 for the channel CA2 and 0x04 for the channel CA3; or
    - the FLG2 counter is initialized to 4 and incremented by 1 for the next channel. The secondary identification information FLG2 is therefore equal to 0x04 for the channel CA1, 0x05 for the channel CA2 and 0x06 for the channel CA3.
    Thus, the secondary identification information FLG2 makes it possible to differentiate the announcement channel CA on which an ADV announcement frame is broadcast.
    The user terminal SP is adapted to scan said at least three announcement channels CA1, CA2, CA3 (illustrated function SCN (SP, CA) illustrated in FIG. 1) to receive said announcement frames ADV (function RX (SP, ADV (FLG1, FLG2), CA) illustrated in Figure 1). Thus, as illustrated in FIG. 3, it receives the plurality of announcement frames ADV1, ADV2, ADV3 broadcast on the three announcement channels CA1, CA2, CA3 respectively by the tags BA1, BA2, BA3 (function illustrated RX (SP, ADV (FLG1, FLG2), CA) in FIG. 1. Thanks to the primary identification information FLG1 and secondary FLG2, the user terminal SP can differentiate the different ADV announcement frames according to the BA tag which broadcasts them and the CA announcement channel used for said broadcast.
    The user terminal SP is thus adapted to store said announcement frames ADV by said user terminal SP as a function of said primary identification information FLG1 and said secondary identification information FLG2 (function illustrated in FIG. 1 MEM (SP, ADV, FLG1, FLG2)).
    Thus, as illustrated in FIG. 1, the user terminal SP stores in its storage unit MEM1:
    - a) the ADV1 announcement frames received from the BA1 tag on the CA1 channel;
    - b) the ADV2 announcement frames received from the BA2 beacon on the CA1 channel;
    - c) the ADV3 announcement frames received from the BA3 tag on the CA1 channel;
    - d) ADV1 announcement frames received from the BA1 tag on the CA2 channel;
    - e) the ADV2 announcement frames received from the BA2 beacon on the CA2 channel;
    - f) the ADV3 announcement frames received from the BA3 tag on the CA2 channel;
    - g) the ADV1 announcement frames received from the BA1 tag on the CA3 channel;
    - h) the ADV2 announcement frames received from the BA2 beacon on the CA3 channel;
    - i) the ADV3 announcement frames received from the BA3 tag on the CA3 channel.
    The user terminal SP is adapted to measure the power in reception RSSI of the stored ADV announcement frames (function illustrated in FIG. 1 MEAS (SP, ADV, RSSI)), namely the measurement of the power in reception RSSI of the frames d ADV of each CA announcement channel broadcast by each BA tag. In the following description, the terms measurement of power in RSSI reception or RSSI measurement will be used interchangeably.
    Thus, the user terminal SP performs a measurement of the power in reception RSSI of the ADV ad frames received as mentioned previously according to §a) to §i). It performs a sorting of these RSSI measurements according to the BA tag which broadcasts the ADV announcement frame (thanks to the primary identification information FLG1) and the CA announcement channel used (thanks to the information of secondary identification FLG2).
    Thus, as illustrated in FIG. 1, the user terminal SP measures and stores in its memory unit MEM1:
    - A) for the BA1 tag:
    - for channel CA1, a power measurement in reception RSS11;
    - for channel CA2, a power measurement in RSS12 reception;
    - for channel CA3, a power measurement in reception RSS13.
    - B) for the BA2 tag:
    - for channel CA1, a power measurement in reception RSS21;
    - for channel CA2, a power measurement in reception RSS22;
    - for channel CA3, a power measurement in reception RSS23.
    - C) for the BA3 tag:
    - for channel CA1, a power measurement in reception RSS31;
    - for channel CA2, a power measurement in RSS32 reception;
    - for channel CA3, a power measurement in reception RSS33.
    Note that the transmit power PUtx varies according to the CA announcement channels used for the same given distance D. Also, when the user terminal SP listens to the three channels CA1, CA2, CA3, even if it does not move and it is at the same distance D, in a nonlimiting example of 40 cm, the measured reception power RSSI varies from one CA announcement channel to another. Thus, for example for the same announcement frame ADV1 sent by the beacon BA1, the user terminal SP performs a first measurement of the power in reception RSSI11 on the announcement channel CA1, a second measurement of the power in reception RSSI12 on the announcement channel CA2, and a third measurement of the power in reception RSSI13 on the announcement channel CA3, the three measurements of the power in reception RSSI11, RSSI12, RSSI13 being different from each other.
    Thus, without the secondary identification information FLG2, even if the user terminal SP is at a given distance D, it would not be possible to know precisely how far it is from the motor vehicle V, because due from the dispersion of the powers at remission PUtx and therefore from the measurements of the power at reception RSSI, one could believe that the user terminal SP is moving and that the distance D at which it is from the motor vehicle V varies.
    In a nonlimiting embodiment, for each BA1, BA2, BA3 tag, an announcement channel CA is taken as the reference channel CArf.
    The user terminal SP is further adapted to perform dynamic normalization of the measurement of the power in reception RSSI of an announcement frame ADV of an announcement channel CA with respect to the measurement of the power in reception RSSIrf d 'an announcement frame ADV of the reference channel CArf as a function of an OFF compensation value (function illustrated in FIG. 1 NORM (RSSI, RSSIrf, OFF, BA)). This standardization is described in more detail below.
    Subsequently, the distance D at which said user terminal SP of the motor vehicle V can be determined for each beacon BA as a function of the measurements of the powers in reception RSSI (function illustrated in FIG. 1 DET (D, RSSI, BA) ), and in particular according to the power measurements in standard RSSI reception. So we know how far
    D is the user terminal SP of the BA1 beacon, how far D is it from the BA2 beacon and how far D is it from the BA3 beacon. This determination is made as a function of a calibration curve which indicates for a given distance value what is the power at transmission PUtx and what is the measurement of the power at reception corresponding RSSI. Remember that when the transmitter is in the same location as the receiver, the transmit power PUtx is equal to the power measurement in RSSI reception. It is recalled that when the distance D is doubled, there is a loss substantially equal to -8db for the power measurement in RSSI reception.
    In a nonlimiting embodiment, this determination is made by the user terminal SP or by the central electronic unit PE of the motor vehicle V illustrated in FIG. 3.
    Finally, the position POS of the user terminal SP with respect to the motor vehicle V is determined as a function of the distances D determined from each beacon BA (function illustrated in FIG. 1 CAL (D, POS, V)). In a nonlimiting embodiment, the POS position is determined according to a triangulation method well known to those skilled in the art. In a nonlimiting embodiment, this determination is made by the user terminal SP or by the central electronic unit PE
    Note that the central electronic unit PE is suitable for communicating with the user terminal SP via the BLE protocol. This central electronic unit PE is adapted to be in the broadcast mode or in the scan mode. In addition to the broadcast frames, it can therefore exchange data frames on the 37 data channels with the user terminal SP.
    The electronic unit PE is in a so-called connectable mode because it can establish a connection with the user terminal SP. The central electronic unit
    PE is suitable for:
    - validate the authentication of the user terminal SP which allows the Fct function to be executed;
    - activate the function to execute Fct such as locking / unlocking the motor vehicle, starting the motor vehicle, etc.
    In the case where the determination of the distance D at which said user terminal SP of the motor vehicle V is carried out by the central electronic unit PE, in a nonlimiting embodiment, the user terminal SP is further adapted to send said power reception measurements RSSI to said central electronic unit PE of said motor vehicle V so that it determines for each beacon BA the distance D at which said user terminal SP of the motor vehicle V is located (function illustrated in FIG. 1 TX ( SP, PE, RSSI)). This function being a nonlimiting embodiment, it is illustrated in dotted lines in FIG. 1.
    In nonlimiting embodiments, the central electronic unit PE is further adapted to perform dynamic normalization and / or calculation of the position POS of the user terminal SP relative to the motor vehicle V.
    The location system SYS described thus makes it possible to implement the method P of locating a user terminal SP with respect to a motor vehicle V comprising a plurality of BA tags, said user terminal SP and the BA tags being adapted to communicate according to a Bluetooth Low Energy ™ communication protocol.
    The steps of the location method P are described below with reference to FIGS. 4 to 6.
    It will be noted that beforehand, an authentication step of the user terminal SP with the electronic unit PE of the motor vehicle V has been carried out (not shown) and said authentication has been validated.
    According to the nonlimiting embodiment illustrated in FIG. 4, the user terminal SP performs for each electronic unit BA the determination of the distance D at which said user terminal SP is located, the calculation of its position as a function of these determined distances D .
    According to step 1) illustrated BRD (BA, ADV (FLG1, FLG2), PUtx, CA), each BA tag broadcasts a plurality of ADV announcement frames within at least two CA announcement channels, each frame ADV announcement broadcast comprising primary identification information FLG1 of a BA tag and secondary identification information FLG2 of the announcement channel CA used. The ADV announcement frames sent by the same BA tag on the at least two CA announcement channels are identical, that is to say they contain the same INF information apart from the secondary identification information FLG2. In the nonlimiting example illustrated, three announcement channels CA1, CA2, CA3 are used.
    ADV frames are broadcast regularly. A BA tag thus sends the same ADV announcement frame several times on said at least three CA announcement channels. Thus, in a nonlimiting embodiment, the broadcasting by each BA tag of an ADV announcement frame on said announcement channels CA is carried out sequentially and according to a primary period T1. In a nonlimiting example, the primary period T1 is substantially equal to 100 ms (milliseconds), more or less 10 ms. These 100ms prevent a collision between the different ADV announcement frames broadcast. Thus, every 100 ms, the same ADV announcement frame is broadcast on a different CA announcement channel.
    In a nonlimiting embodiment, the broadcasting of an ADV announcement frame is carried out according to a time substantially equal to 3 ms.
    Thus, as illustrated in FIG. 5, a beacon BA sends over three primary periods T1, an announcement frame ADV on the channel CA1, then the same announcement frame ADV on the channel CA2, and finally the same frame ADV announcement on channel CA3.
    According to step 2) illustrated SCN (SP, CA), the user terminal SP scans said three announcement channels CA to receive said broadcast ADV announcement frames.
    CA ad channel scanning is performed regularly. Thus, in a nonlimiting embodiment, the scanning of the announcement channels
    CA is carried out according to a secondary period T2. In a nonlimiting example, the secondary period T2 is equal to 5s (seconds).
    It will be noted that the primary period T1 for broadcasting the ADV announcement frames on the announcement channels CA is less than the secondary period T2 for scanning said announcement channels CA. This allows the user terminal SP to be sure of receiving the ADV broadcast announcement frames on a given CA announcement channel.
    Thus, as illustrated in FIG. 5, the user terminal SP scans the three announcement channels CA1, CA2, CA3 over three secondary periods T2, the channel CA1, then the channel CA2, and finally the channel CA3.
    It will be noted that the actual listening of an announcement channel takes place over a listening time W2 substantially less than the secondary scanning period T2 as illustrated in FIG. 5. The listening time can be variable . In a nonlimiting embodiment, it is 4.99s. In a nonlimiting embodiment, the difference between W2 and T2 can vary between 5 ms and 10 ms.
    It will be noted that in a nonlimiting embodiment, the broadcasting by each BA tag of the plurality of ADV announcement frames within the three announcement channels CA and the scanning of said three announcement channels CA are out of sync as can be see it in Figure 5. Note that in the diagram in Figure 5 the periods T1 and T2 are not on the same scale.
    According to step 3) illustrated RX (SP, ADV (FLG1, FLG2), CA), the user terminal SP receives said broadcast ADV announcement frames. Each ADV announcement frame broadcast includes primary identification information FLG1 and secondary identification information FLG2 as described above.
    According to step 4) illustrated MEM (SP, ADV, FLG1, FLG2), the user terminal SP stores said announcement frames ADV as a function of said primary identification information FLG1 and said secondary identification information FLG2.
    Thus, it stores the announcement frames ADV1, ADV2, ADV3 of the beacons BA1, BA2, BA3 broadcast on the channels CA1, CA2, CA3 as mentioned in §a to i above.
    According to step 5) illustrated MEAS (SP, ADV, RSSI), the user terminal SP measures the power in reception RSSI of said stored ADV announcement frames.
    Thus, it measures the powers in reception RSSI11, RSSI12, RSSI13, and RSSI21, RSSI22, RSSI23, and RSSI31, RSSI32, RSSI33 as mentioned previously in §A to C).
    It will be recalled that due to the variations in the powers at transmission of an ADV announcement frame which depends on the announcement channel CA used, the sensitivity on reception of the user terminal SP of an ADV announcement frame varies. depending on the CA announcement channel used for the broadcast. Also, following the measurement of the RSSI reception power of said stored ADV announcement frames, in a non-limiting embodiment, the user terminal can compensate for a measurement for each announcement channel CA of each beacon BA of the power in memorized RSSI reception.
    To this end, the user terminal SP compares said power measured in RSSI reception with a theoretical power corresponding to a distance determined by means of a power regression curve as a function of the distance (also called regression curve or RSSI curve "Received Signal Strength Indication ”). On the abscissa, we find the distance (in centimeters), on the ordinate, we find the power (in decibels). If there is an offset between said measured RSSI power and said theoretical power, the user terminal SP compensates said measured RSSI power as a function of this offset. A regression curve is associated with each BA tag and each CA announcement channel. In the nonlimiting example of three BA1, BA2 and BA3 tags and three announcement channels CA1, CA2, CA3, there are therefore six regression curves. Thus, thanks to the primary FLG1 and secondary FLG2 identification information, we know which regression curve to use to determine precisely the measurement of the power in RSSI reception of each ADV announcement frame broadcast by a given BA tag and on a given CA announcement channel. Thus, a measurement correlation can be made between the RSSI reception power and the CA announcement channel on which an ADV announcement frame is broadcast.
    It is recalled that the power at transmission PUtx of the same ADV announcement frame broadcast by the same BA tag varies from one CA announcement channel to another CA for the same given distance D. Also, now that the ADV announcement frames have been sorted according to each announcement channel CA, in order to know precisely the distance D at which the user terminal SP is located relative to the motor vehicle V, the next step is performed.
    For each beacon BA1, BA2, BA3, an announcement channel CA is taken as the reference channel CArf, and according to step 6) illustrated NORM (RSSI, RSSIrf, OFF, BA), the user terminal SP performs dynamic normalization of the RSSI reception power measurement of an ADV announcement frame of an CA announcement channel compared to the RSSIrf reception power measurement of an ADV announcement frame of the reference channel CArf in OFF function.
    In a nonlimiting embodiment, the reference channel CArf is channel 37. It will be noted that this channel 37 is less used by other communication protocols (such as WIFI or ZigBee) which use the same frequency band at 2 , 4GHz and therefore will have less disturbance. The measurement of the power in RSSI reception will therefore be more reliable.
    In other nonlimiting embodiments, the reference channel CArf is channel 38 or 39.
    It will be noted that the normalization is carried out at each change of announcement channel CA, namely each time that the user terminal SP scans a new announcement channel CA, and this for each beacon BA. Normalization is thus dynamic since the OFF compensation value can vary with each change of CA announcement channel. In other words, there is dynamic compensation of OFF compensation value each time the CA announcement channel is changed.
    Thus, in a nonlimiting embodiment, the compensation value OFF is equal to the difference between the measurement of the power in reception RSSIrf of an announcement frame ADV of the reference channel CArf and the measurement of the measurement of the RSSI reception power of an ADV announcement frame of a CA announcement channel.
    Thus, as in the nonlimiting example illustrated in FIG. 5, for a BA tag:
    - the announcement channel 37 (namely the channel CA1) is taken as the reference announcement channel CArf. In the interval t1-t2 which lasts a secondary period T2 (namely 5s in the nonlimiting example taken), the average of the measurements of the power in reception RSSIrf of the same frame of announcement ADV broadcast several times on the announcement channel 37 is substantially equal to -64db;
    - a) in the interval t2-t3 which lasts a secondary period T2, the average of the power measurements in reception RSSI of the same announcement frame ADV broadcast several times on the announcement channel 38 (namely the channel CA2) is substantially equal to -85db. We can see that when switching from announcement channel 37 to announcement channel 38, we lose 20db;
    - b) in the interval t3-t4 which lasts a secondary period T2, the average of the power measurements in RSSI reception of the same ADV announcement frame broadcast several on the announcement channel 39 (namely the channel CA3) is substantially equal to -67db. When switching from announcement channel 37 to announcement channel 39, you lose 3db.
    For case a), the OFF compensation value is equal to +21 db. We will therefore have a normalization of the power measurements in RSSI reception of +21 db. In other words, we add +21 db to -85db. We then get -64db.
    For case b), the OFF compensation value is equal to + 3db. We will therefore have a normalization of the power measurements in RSSI reception of + 3db. In other words, we add + 3db to -67db. We then get -64db.
    In a nonlimiting embodiment, the localization method P can also comprise a static calibration of the power measurements in RSSI reception of the ADV announcement frames broadcast on the three announcement channels 37, 38, 39. This calibration static can be done as a function of the gain of the antennas BLE of the communication modules MC2 of the beacons BA which can be different and / or as a function of the path traveled by the radio waves emitted by said antennas to send said announcement frames ADV etc.
    Thus, following said dynamic normalization, according to a step 7) illustrated DET (D, RSSI, BA), the distance D at which said user terminal SP of the motor vehicle V is determined is determined according to the measurements of the powers in reception RSSI, and more particularly according to the measurements of the powers in reception RSSI normalized. This determination is made for each BA tag. Thus, in the nonlimiting example given, there will be three determined distances D.
    Thus, in a nonlimiting example, the measurements of the powers in standard RSSI reception are substantially equal to -64db ,. In a nonlimiting embodiment, this determination is made by the user terminal SP as illustrated in FIG. 4.
    According to a step 8) illustrated CALC (D, POS, V), the user terminal SP calculates its position POS relative to the motor vehicle V as a function of the distances D determined relative to each beacon BA. For this purpose, the position is calculated by triangulation
    Triangulation provides a more precise location of the user terminal SP.
    Indeed, it makes it possible to solve the problems of precision of power measurements in RSSI reception below.
    A power measurement in RSSI reception varies while the user is at the same distance D from the motor vehicle V, depending on:
    - a) the position where the user is located and therefore the user terminal SP with respect to the motor vehicle V. Depending on the position, the radio waves must more or less pass through the human body. Indeed, at the frequency of 2.4 GHz, RF radio waves are attenuated by the human body unlike low frequency radio waves at 125 kHz;
    - b) the way in which the user holds the user terminal SP;
    - c) of the BLE antenna of the MC1 wireless communication module which is non-isotropic because it does not radiate uniformly in all directions.
    a) Thus, for example if the user carries the user terminal SP in such a way that the user terminal SP is located between the user and the motor vehicle V (for example the user is facing the motor vehicle V and carries his terminal user SP in front of him), the power measurement in reception RSSI will for example be equal to -60db while if the user carries the user terminal SP in such a way that his body is between the user terminal SP and the motor vehicle V ( for example the user is back to the motor vehicle V and carries his user terminal SP in front of him), the power measurement in reception RSSI will be for example equal to -70db, the radio waves transmitted / received (to broadcast an announcement frame ADV) by the user terminal SP, in this case having to pass through the human body.
    b) Thus, for example depending on whether the user holds the user terminal SP in his hand close to his ear, in his hand while looking at the screen, in a back pocket, before etc., the RSSI measurement may be different.
    c) The BLE antenna is non-isotropic so that the radio waves are attenuated when the user terminal SP is glued to the user's ear for security reasons.
    Thus, in a nonlimiting example, there may be a variation of 10 dB due to the human body, and / or due to the handling of the user terminal SP, and / or due to the BLE antenna. We can thus have a total variation of 30db. Thus, if for example the user terminal SP is 1m from the motor vehicle V, we can believe that it is five times further, namely 5m.
    Thus, all these reasons lead to a lack of precision in the location of the user terminal SP with respect to the motor vehicle V which is overcome thanks to the triangulation.
    It will be noted that in addition to these power measurements in RSSI reception which vary, another problem is solved by the triangulation which is that of the difficulty in determining the distance D at which a motor vehicle is located due to the RF radio waves sent at the frequency of 2.4 GHz. Indeed, for an RF radio wave at the frequency of 2.4 GHz, when the distance D is doubled, there is a loss substantially equal to -8db for the RSSI measurement. For example, when going from 1m to 2m in distance from motor vehicle V, the slope between the distance in meters and the RSSI measurement is small. It is difficult to know whether we are 1m or 2m from the motor vehicle V, unlike low frequency radio waves BF at 125KHz for example where we observe in this case a loss of -18db. The accuracy of power measurements in RSSI reception at 2.4 GHz is three times worse than for power measurements in RSSI reception at 125 kHz. Also, triangulation solves this problem of precision.
    According to a step 9) illustrated TX (SP, PE, POS), the user terminal SP sends the calculated position POS to the central electronic unit PE, which receives it according to step 10) illustrated RX (PE, SP, POS) .
    According to a step 11) illustrated ACTV (Fct), depending on the position POS thus calculated, the Fct function is activated or not. Thus, if the determined distance D is less than or equal to the threshold distance Ds, the locking / unlocking of the motor vehicle V or even its starting is activated. In a nonlimiting embodiment, the activation of said function Fct is carried out by the central electronic unit PE.
    Thus, the location method P makes it possible to determine the distance D at which the user terminal SP is located with respect to the motor vehicle V, in a precise manner.
    Of course, in another nonlimiting embodiment, steps 6, 7, 8 can be carried out by the central electronic unit PE. In this case there are no steps 9 and 10. In this case, the location method P further comprises the sending by the user terminal SP of said power measurements in reception RSSI to said central electronic unit PE for that it determines for each beacon BA the distance D at which said user terminal SP of the motor vehicle V.
    As illustrated in FIG. 4, the invention also relates to a method of broadcasting P1 by a plurality of BA tags of ADV announcement frames, said BA tags and said user terminal SP being adapted to communicate according to a Bluetooth communication protocol. Low Energy ™ BLE, according to which said P1 diffusion process comprises:
    a broadcast by each BA tag of a plurality of ADV announcement frames within at least three CA announcement channels, each ADV announcement frame broadcast comprising primary identification information FLG1 of a BA tag and secondary identification information FLG2 of the announcement channel CA used.
    Of course, the description of the invention is not limited to the application, to the embodiments and to the examples described above.
    Thus, in a nonlimiting embodiment where the BA tags are positioned in the tires, they can be used for a TPMS application called in English “Tire Pressure Monitoring System” which gives information on the tire pressure.
    Thus, in another nonlimiting embodiment, the function Fct executed is an automatic parking of the motor vehicle V.
    Thus, in another nonlimiting embodiment, the process of identifying an announcement channel (and therefore the use of the secondary identification information FLG2 in an ADV announcement frame) can be used to applications other than the location of a user terminal SP, within the framework of BLE exchanges between a transmitter and a receiver. It can thus be used for any communication method between a user terminal and an electronic unit BA, PE adapted to communicate according to a Bluetooth Low Energy ™ BLE communication protocol, said location method P comprising:
    a broadcast by each electronic unit BA, PE of a plurality of ADV announcement frames within at least two announcement channels CA, each ADV announcement frame broadcast comprising primary identification information FLG1 of an electronic unit BA, PE and secondary identification information FLG2 of the announcement channel CA used;
    - A scan of said at least two announcement channels CA by said user terminal SP to receive said broadcast ADV announcement frames;
    - storage of said ADV announcement frames by said user terminal SP as a function of said primary identification information FLG1 and said secondary identification information FLG2.
    In a nonlimiting embodiment, this method can further comprise:
    - a measurement of the power in RSSI reception by said user terminal SP of said stored ADV announcement frames.
    Thus, the invention described has in particular the following advantages:
    - it is simple to implement;
    - it solves the problem of dispersing reception power measurements on the various CA announcement channels;
    - it allows the use of user terminals SP which are mobile telephones and which do not have an on-board LF location system;
    - it makes it possible to make a location system at 2.4 GHz more precise.
    权利要求:
    Claims (21)
    [1" id="c-fr-0001]
    1. Method for locating (P) a user terminal (SP) relative to a motor vehicle (V) comprising a plurality of electronic units (BA, PE), said user terminal (SP) and the electronic units (BA , PE) being adapted to communicate according to a Bluetooth Low Energy ™ communication protocol (BLE), according to which said localization method (P) comprises:
    a broadcast by each electronic unit (BA, PE) of a plurality of announcement frames (ADV) within at least two announcement channels (CA), each announcement frame (ADV) broadcast comprising a primary identification information (FLG1) of an electronic unit (BA, PE);
    - a scanning of said at least two announcement channels (CA) by said user terminal (SP) to receive said broadcast announcement frames (ADV);
    - storage of said announcement frames (ADV) by said user terminal (SP) as a function of said primary identification information (FLG1);
    - a measurement of the reception power (RSSI) by said user terminal (SP) of said stored announcement frames (ADV);
    - for each electronic unit (BA, PE), a determination of the distance (D) at which said user terminal (SP) of the motor vehicle (V) is located as a function of said measurements of powers of reception (RSSI);
    - a calculation of the position (POS) of the user terminal (SP) relative to the motor vehicle (V) as a function of the distances (D) determined for each electronic unit (BA, PE).
    [2" id="c-fr-0002]
    2. Localization method (P) according to claim 1, according to which each broadcast announcement frame (ADV) also comprises secondary identification information (FLG2) of the announcement channel (CA) used and in that said terminal user (SP) also stores said announcement frames (ADV) based on said secondary identification information (FLG2).
    [3" id="c-fr-0003]
    3. Localization method (P) according to claim 2, according to which for each electronic unit (BA, PE), an announcement channel (ADV) is taken as reference channel (CArf) and the localization method (P) further includes:
    - dynamic normalization of the measurement of the reception power (RSSI) of an announcement frame (ADV) of an announcement channel (CA) compared to the measurement of the reception power (RSSIrf) of an announcement frame (ADV) of the reference channel (CArf) according to a compensation value (OFF).
    [4" id="c-fr-0004]
    4. Localization method (P) according to claim 2 or claim 2, wherein said secondary identification information (FLG2) is a counter, said counter being incremented as a function of the announcement channel (CA) used.
    [5" id="c-fr-0005]
    5. Localization method (P) according to any one of the preceding claims 2 to 4, according to which said at least two announcement channels (CA) are distributed over a frequency band of 2.4 GHz.
    [6" id="c-fr-0006]
    6. Localization method (P) according to any one of the preceding claims 2 to 5, according to which the motor vehicle comprises at least two electronic units (BA, PE).
    [7" id="c-fr-0007]
    7. Localization method (P) according to any one of the preceding claims 2 to 6, according to which said scanning of said at least two announcement channels (CA) is carried out sequentially and according to a secondary period (T2).
    [8" id="c-fr-0008]
    8. Localization method (P) according to claim 7, according to which the broadcasting by each electronic unit (BA, PE) of an announcement frame (ADV) on said at least announcement channels (CA) takes place. sequentially and according to a primary period (T1) less than said secondary period (T2).
    [9" id="c-fr-0009]
    9. Localization method (P) according to claim 8, according to which the primary period (T1) is substantially equal to one hundred milliseconds.
    [10" id="c-fr-0010]
    10. Localization method (P) according to claim 8 or claim 9, according to which the secondary period (T2) is substantially equal to five seconds.
    [11" id="c-fr-0011]
    11. Localization method (P) any one of the preceding claims 2 to 10, according to which the user terminal (SP) is a mobile telephone, an identifier, a badge, a tablet.
    [12" id="c-fr-0012]
    12. Location method (P) any one of the preceding claims 2 to 11, according to which said electronic unit (BA) is a beacon.
    [13" id="c-fr-0013]
    13. Location method (P) any one of the preceding claims 2 to 12, according to which the determination of said distance (D) and / or the calculation of the position (POS) of the user terminal (SP) is carried out by said user terminal (SP) or an electronic unit (PE) of said motor vehicle (V).
    [14" id="c-fr-0014]
    14. Method of broadcasting (P1) by a plurality of beacons (BA) of announcement frames (ADV), said electronic units (BA, PE) and said user terminal (SP) being adapted to communicate according to a Bluetooth communication protocol Low Energy ™ (BLE), according to which said diffusion process (P1) comprises:
    a broadcast by each electronic unit (BA, PE) of a plurality of announcement frames (ADV) within at least two announcement channels (CA), each announcement frame (ADV) broadcast comprising a primary identification information (FLG1) of an electronic unit (BA, PE) and secondary identification information (FLG2) of the announcement channel (CA) used.
    [15" id="c-fr-0015]
    15. User terminal (SP) adapted to communicate according to a Bluetooth Low Ernergy communication protocol (BLE) with a plurality of electronic units (BA, PE) of a motor vehicle (V), according to which said user terminal (SP) is suitable for:
    - scanning at least two announcement channels (CA) to receive said announcement frames (ADV) broadcast on said at least two announcement channels (CA), each announcement frame (ADV) broadcast comprising information primary identification (FLG1) of an electronic unit (BA, PE);
    - store said announcement frames (ADV) as a function of said primary identification information (FLG1);
    - measure the received power (RSSI) of the announcement frames (ADV) of each announcement channel (CA).
    [16" id="c-fr-0016]
    16. User terminal (SP) according to claim 15, according to which said user terminal (SP) is further adapted for:
    - storing said announcement frames (ADV) also as a function of secondary identification information (FLG2) of the announcement channel (CA) used, broadcast in said announcement frames (ADV) in addition to said information primary identification (FLG1),
    [17" id="c-fr-0017]
    17. User terminal (SP) according to claim 16, according to which said user terminal (SP) is further adapted for:
    - For each electronic unit (BA, PE), determine the distance (D) at which said user terminal (SP) of the motor vehicle (V) is based on said measurements of reception powers (RSSI) and calculate the position (POS ) the user terminal (SP) relative to the motor vehicle (V) as a function of the distances (D) determined for each electronic unit (BA, PE); or
    - send said received power measurements (RSSI) to an electronic unit (UE) of said motor vehicle (V).
    [18" id="c-fr-0018]
    18. User terminal (SP) according to claim 16 or claim 17, according to which for each electronic unit (BA, PE) an announcement channel (CA) is taken as reference channel (CArf) and according to which said user terminal (SP) is further adapted to perform dynamic normalization of the reception power measurement (RSSI) of an announcement frame (ADV) of an announcement channel (CA) with respect to the measurement of the reception power (RSSIrf) of an announcement frame (ADV) of the reference channel (CArf) according to a compensation value (OFF).
    [19" id="c-fr-0019]
    19. Electronic unit (BA, PE) for a motor vehicle adapted to communicate according to a Bluetooth Low Ernergy (BLE) communication protocol with a user terminal (SP), according to which said electronic unit (BA, PE) is suitable for:
    - broadcast a plurality of announcement frames (ADV) within at least two announcement channels (CA), each announcement frame (ADV) broadcast comprising primary identification information (FLG1) of a unit electronic (BA, PE) and secondary identification information (FLG2) of the announcement channel (CA) used.
    [20" id="c-fr-0020]
    20. Locating system (SYS) of a user terminal (SP) relative to a motor vehicle (V) comprising a plurality of electronic units (BA, PE), said user terminal (SP) and said electronic units (BA , PE) being adapted to communicate according to a Bluetooth Low Energy ™ communication protocol (BLE), according to which said system (SYS) comprises:
    - said electronic unit (BA, PE) adapted for:
    - broadcast a plurality of announcement frames (ADV) within at least two announcement channels (CA), each announcement frame (ADV) broadcast comprising primary identification information (FLG1) of a unit electronic (BA, PE) and secondary identification information (FLG2) of the announcement channel (CA) used;
    - said user terminal (SP) adapted for:
    - scanning said at least two announcement channels (CA) to receive said broadcast announcement frames (ADV);
    - store said announcement frames (ADV) according to said secondary identification information (FLG2);
    - measure the received power (RSSI) of the announcement frames (ADV) of each announcement channel (CA).
    [21" id="c-fr-0021]
    21. Location system (SYS) according to claim 18, according to which said user terminal (SP) is further adapted for:
    - for each electronic unit (BA, PE), determine the distance (D) at which said user terminal (SP) of the motor vehicle (V) is based on said measurements of reception powers (RSSI) and calculate the position (POS ) the user terminal (SP) relative to the motor vehicle (V) as a function of the distances (D) determined for each electronic unit (BA, PE); or
    - send said received power measurements (RSSI) to an electronic unit (UE) of said motor vehicle (V).
    3061;
    1/4
    MC1 PRO1
    SCN (SP, CA)
    RX (SP, ADVÎFLG1, FLG2), CA))
    MEMiSP, ADV, FLG1.FLG2) MEAS (SP, ADV, RSSI) NORM (RSSI, RSSIrf, OFF, BA)
    TX (SP ',' PÊ / Rssr)
    L _ _ P_ E _T (_P L P. s .§ L BA) _ _. ί _ _. A _E (P _._ Pps._Y) ....; ...... TX (SP, 'PË POSj
    CA1-BA1: ADV1, RSS111
    CA1-BA2: ADV2, RSSI21
    CA1-BA3: ADV3, RSSI31
    CA2-BA1: ADV1, RSSI12
    CA2-BA2: ADV2, RSSI22
    CA2-BA3: ADV3, RSSI32
    CA3-BA1: ADV1, RSS113
    CA3-BA2: ADV2, RSSI23
    CA3-BA3: ADV3, RSSI33
    SYS
    CA1_
    ADV
    CA2
    ADV
    CA3
    ADV
    MC2
    PRO2
    BRD (BA, ADV (FLG1, FLG2), PUtx, CA ;
    L..Ρ-ΡΤίΡι PPSL BA) l ___ ALCP’_PPJ ’_ Y) j
    ; ...... RX (PË, 'SP' POS) '|
    MEM2
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    FR3091126B1|2018-12-20|2020-11-27|Valeo Comfort & Driving Assistance|Learning method in a localization system of an electronic device and associated localization method|
    CN110337097B|2019-06-27|2020-10-27|安凯微电子技术有限公司|Advertisement data management method and device of Bluetooth baseband chip|
    FR3111312A1|2020-06-15|2021-12-17|Continental Automotive|PROCESS FOR ACTIVATION OF A FUNCTION OF A VEHICLE BY ULTRA HIGH FREQUENCY WITH A USER'S PORTABLE EQUIPMENT AND DEVICE FOR ACTIVATION OF AN ASSOCIATED FUNCTION|
    法律状态:
    2018-01-02| PLFP| Fee payment|Year of fee payment: 2 |
    2018-06-29| PLSC| Publication of the preliminary search report|Effective date: 20180629 |
    2018-12-31| PLFP| Fee payment|Year of fee payment: 3 |
    2019-12-31| PLFP| Fee payment|Year of fee payment: 4 |
    2020-12-31| PLFP| Fee payment|Year of fee payment: 5 |
    2021-12-31| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1663310|2016-12-23|
    FR1663310A|FR3061308B1|2016-12-23|2016-12-23|METHOD FOR LOCATING A USER TERMINAL IN RELATION TO A MOTOR VEHICLE|FR1663310A| FR3061308B1|2016-12-23|2016-12-23|METHOD FOR LOCATING A USER TERMINAL IN RELATION TO A MOTOR VEHICLE|
    EP17209644.8A| EP3339877A1|2016-12-23|2017-12-21|Method for locating a user terminal relative to a motor vehicle|
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