Classifications

• • G—PHYSICS
  • G07—CHECKING-DEVICES
  • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
  • G07C9/00—Individual registration on entry or exit
  • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
  • G07C9/00309—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
  • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
  • B60R25/20—Means to switch the anti-theft system on or off
  • B60R25/24—Means to switch the anti-theft system on or off using electronic identifiers containing a code not memorised by the user
  • B60R25/245—Means to switch the anti-theft system on or off using electronic identifiers containing a code not memorised by the user where the antenna reception area plays a role
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B17/00—Monitoring; Testing
  • H04B17/30—Monitoring; Testing of propagation channels
  • H04B17/309—Measuring or estimating channel quality parameters
  • H04B17/318—Received signal strength
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
  • H04W4/02—Services making use of location information
  • H04W4/029—Location-based management or tracking services
• • G—PHYSICS
  • G07—CHECKING-DEVICES
  • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
  • G07C2209/00—Indexing scheme relating to groups G07C9/00 - G07C9/38
  • G07C2209/60—Indexing scheme relating to groups G07C9/00174 - G07C9/00944
  • G07C2209/63—Comprising locating means for detecting the position of the data carrier, i.e. within the vehicle or within a certain distance from the vehicle

Definitions

• the present invention relates to a hands-free access system to a vehicle. It finds a particular but nonlimiting application in motor vehicles.
• a drawback of this state of the art is that if another motor vehicle located near the motor vehicle concerned and also emits an external signal such as a location frame at the same time as said motor vehicle concerned, the hands-free identifier will also capture this location frame, and will perform an RSSI measurement of this location frame in addition to that of the motor vehicle concerned. The hands-free identifier will thus send an erroneous RSSI measurement back to said hands-free access device of the motor vehicle concerned and said motor vehicle will make a bad decision concerning the authorization to lock or unlock.
• the hands-free access device of the motor vehicle concerned may believe that said hands-free identifier is located in its own unlocking zone, and authorize the unlocking of its doors when it should prohibit it.
• the present invention aims to provide a hands-free access system to a vehicle which solves the mentioned drawback.
• the invention provides a hands-free access system to a vehicle, said hands-free access system comprising: a. a hands-free access device for said vehicle configured to:
• a location frame comprising a modulated signal and a pure carrier signal transmitted during time windows at different time intervals
• a hands-free identifier configured for:
• the hands-free access system may further include one or more additional characteristics taken alone or in any technically possible combination, among the following.
• said location frame is a low frequency frame
• said at least one measurement of the power in reception of a primary received signal is sent in a radiofrequency frame.
• said hands-free identifier verifies the presence of noise by performing at least one power measurement in reception of a secondary received signal between the time windows during the time intervals.
• said at least one measurement of power in reception of a secondary received signal is greater than a primary threshold, there is noise.
• said hands-free identifier checks for the presence of noise by performing a plurality of power measurements on reception of a primary received signal on said pure carrier signal for at least one given window and by calculating an average on said power measurements in reception of a primary received signal.
• said hands-free identifier carries out four power measurements on reception of a primary received signal.
• said hands-free access device of said vehicle is further configured to re-transmit said location frame after having received a measurement of the power in reception of a primary received signal.
• said hands-free access device is further configured for:
• said hands-free access device is further configured to periodically send said location frame according to a period, said period being modified randomly.
• the vehicle is a motor vehicle.
• a hands-free identifier is also proposed for hands-free access to a vehicle, characterized in that said hands-free identifier is configured for:
• a hands-free access device of said vehicle said location frame comprising a modulated signal and a pure carrier signal transmitted during time windows at regular time intervals
• said hands-free identifier verifies the presence of noise by performing at least one power measurement in reception of a secondary received signal between the time windows during the time intervals.
• said hands-free identifier checks for the presence of noise by performing a plurality of power measurements in reception of a primary received signal on said pure carrier signal and by calculating an average on said measurements of receiving power of a primary received signal.
• a hands-free access device of a vehicle said hands-free access device being configured for:
• a location frame comprising a modulated signal and a pure carrier signal transmitted during time windows at regular time intervals
• said hands-free access device of said vehicle is further configured to re-transmit said location frame after having received a measurement of the power in reception of a primary received signal.
• said hands-free access device is further configured for: - periodically transmit said location frame
• said hands-free access device is further configured to periodically send said location frame according to a period, said period being modified randomly.
• a method of hands-free access to a vehicle is also provided, according to which said hands-free access method comprises:
• a hands-free access device of said vehicle of a location frame
• said location frame comprising a modulated signal and a pure carrier signal transmitted during time windows at regular time intervals
• FIG. 1 schematically illustrates a hands-free access system to a vehicle, said hands-free access system comprising a hands-free access device of said vehicle and a hands-free identifier, according to a non-limiting embodiment of the invention
• FIG. 2 schematically illustrates said hands-free identifier and said vehicle of FIG. 1 with localization zones, according to a non-limiting embodiment
• FIG. 3 schematically illustrates said vehicle and said identifier of FIG. 1, said vehicle and said identifier being close to another vehicle, according to a non-limiting embodiment
• FIG.4 schematically illustrates a location frame transmitted by said hands-free access device of said vehicle of FIG. 1, said location frame comprising a modulated signal and a pure carrier signal transmitted during time windows at different intervals, and times when the hands-free identifier of FIG. 1 will carry out a measurement of the power on reception of a primary received signal on said location frame, according to a non-limiting embodiment
• FIG. 5 schematically illustrates a location frame transmitted by said hands-free access device of said vehicle of FIG. 1, and times when the hands-free identifier of FIG. 1 will perform a measurement of the power in reception of a primary received signal on said location frame, said instants being between said time windows when said pure carrier signal of said location frame is transmitted, according to an embodiment not limiting,
• FIG. 6 schematically illustrates a location frame transmitted by said hands-free access device of said vehicle of FIG. 1, and a moment when the hands-free identifier of FIG. 1 will perform four measurements of the power in reception of a primary received signal on said location frame, according to a non-limiting embodiment
• FIG. 7 schematically illustrates a method of hands-free access to a vehicle implemented by said hands-free access system of FIG. 1, according to a non-limiting embodiment.
• the vehicle 2 is a motor vehicle.
• motor vehicle is meant any type of motor vehicle. This embodiment is taken as a non-limiting example in the remainder of the description.
• the hands-free access system 1 comprises: - a hands-free access device 20 which is part of the motor vehicle 2,
• the hands-free access device 20 comprises at least one transmitter / receiver 21 and an electronic central unit 22.
• the transmitter / receiver 21 comprises an antenna 210.
• the antenna 210 is a low frequency antenna, otherwise called an LF antenna.
• the hands-free access device 20 comprises a plurality of transmitter / receiver 21 and therefore a plurality of antennas 210.
• the device d The hands-free access 20 includes five transmitter / receivers 21.
• the hands-free access device 20 is configured for:
• - transmit a location frame 2a (illustrated function fl (20, 2a (20a, 21a))), said location frame 2a comprising a modulated signal 20a and a pure carrier signal 21a transmitted during time windows t1 at different intervals of time t2.
• the location frame 2a is transmitted at low frequency.
• the low frequency is of the order of 125kHz
• said hands-free device 20 is further configured to send an identification frame 2b (illustrated function f5 (20, 2b)). In a non-limiting embodiment, this identification frame 2b is sent periodically. In a non-limiting embodiment, this identification frame 2b is transmitted at low frequency. In this case, the authentication frame 2b is otherwise called the identification BF frame 2b. This nonlimiting embodiment is taken as a nonlimiting example in the remainder of the description.
• the hands-free identifier 10 allows access to the motor vehicle 2. It is also called the passive access identifier. In a non-limiting embodiment, the hands-free identifier 10 can also allow passive starting of the motor vehicle 2.
• the hands-free identifier 10 is a key or a smart phone, otherwise called a smartphone.
• the hands-free identifier 10 comprises an antenna 100 with three coils 100x, 100y, 100z perpendicular to each other which extend along three axes X, Y and Z perpendicular to each other. These coils make it possible to carry out measurements of the power on reception of a received signal, otherwise called RSSI measurements, along the three axes X, Y and Z.
• the hands-free device 20 of said motor vehicle 2 will authorize or prohibit access to said motor vehicle 2, namely it will lock or unlock the motor vehicle 2, in other words it will lock or unlock the openings (doors, trunk, tailgate) of the motor vehicle 2.
• the location zones Z are defined around the motor vehicle 2. These Z location zones are:
• zone Z3 a welcome zone Z3, otherwise called zone Z3. In a non-limiting embodiment, it corresponds to a distance between approximately 3 to 5 meters around the motor vehicle 2. This welcome zone Z3 indicates that the hands-free identifier 10 is present,
• zone Z2 a remote locking zone Z2, otherwise called zone Z2.
• zone Z2 corresponds to a distance of approximately 2 meters around the motor vehicle 2
• zone Zl an unlocking zone Zl, otherwise called zone Zl.
• zone Zl corresponds to a distance of approximately 1.5 meters around the motor vehicle 2.
• the hands-free identifier 10 is configured for:
• the primary measurement RSSI1 is sent by radio frequency, otherwise called RF.
• the radio frequency is between 300 and 910 MHz. In a non-limiting variant embodiment, it is equal to 433 MHz or 868 MHz. In another non-limiting variant embodiment, it is equal to 315 MHz. In another non-limiting variant embodiment, it is equal to 902 MHz.
• the hands-free identifier 10 is further configured to authenticate to said hands-free device 20 of said motor vehicle 2 (illustrated function f4 '(10, 2)). When it identifies itself, it synchronizes with the hands-free device 20 so as to be able to recover the pure carrier signal 21a (which is not modulated) of the location frame 2a transmitted during the various time windows t1. Furthermore, during identification, the hands-free identifier 10 and the motor vehicle 2 exchange their identification code. As they have been paired beforehand, they can thus recognize each other by means of their identification code.
• the hands-free identifier 10 enters the zone Z3, it will pick up the LF identification frames 2b of the motor vehicle 2 and will respond by radio frequency to the motor vehicle 2 to authenticate itself. If the hands-free identifier 10 is authenticated, the motor vehicle 2 will send, via its hands-free device 20, a new type of frames, namely the location frames 2a. The hands-free identifier 10 will pick up these location frames 2a and send back a radiofrequency response containing the measurement of the field emitted by the various antennas 210 of the motor vehicle 2, what is called the primary measurements RSSI1.
• the motor vehicle 2 has a table of field levels corresponding to the limit of the different zones Zl, Z2 and Z3 for the various antennas 210.
• the hands-free identifier 10 enters the zone Zl, it will measure one or more fields and send it back to the motor vehicle 2.
• These fields or primary measurements RSSI1 are compared with one or more thresholds. If the primary RSSI1 measurement (s) returned are greater than these thresholds, this means that the hands-free identifier 10 has entered zone Z1 and the motor vehicle 2 will unlock.
• the motor vehicle 2 When the motor vehicle 2 is unlocked, the latter will periodically emit location frames 2a again. Again, the hands-free identifier 10 will return primary measurements RSSI1 in radiofrequency. And the motor vehicle 2 will compare these primary RSSI1 measurements with new thresholds which will this time make it possible to lock the motor vehicle 2. Thus, if the hands-free identifier leaves the zones ZI and Z2 and if it is found in zone Z3, then the primary measurement (s) RSSI1 returned by the hands-free identifier 10 will be less than one of these thresholds .
• the hands-free identifier 10 is further configured for:
• An external signal 2a' can come from:
• an external jammer which transmits at low frequency such as in non-limiting examples a smartphone, a computer, a transmission terminal, or any other external device,
• the external signal 2a ' can be a location frame 2a' transmitted by this other motor vehicle 6. If in a non-limiting example two motor vehicles 2 and 6 are side by side two meters from each other, as illustrated in Figure 3, the hands-free identifier 10 of the motor vehicle 2 is close to the vehicle 6 and in the zone Z3 of the motor vehicle 6. The hands-free identifier 60 of the motor vehicle 6 is close to the motor vehicle 2 and in the zone Z3 of the motor vehicle 2.
• the motor vehicle 6 transmits a location frame 2a 'in at the same time as the motor vehicle 2, the field emitted by said location frame 2a 'will be superimposed on the field emitted by the location frame 2a of the motor vehicle 2, thus generating noise 22a on said location frame 2a of the motor vehicle 2 .
• a location frame 2a transmitted by the hands-free device 20 of the motor vehicle 2 is illustrated in FIG. 4. It comprises a modulated signal 20a and a pure carrier signal 21a. The latter is sent during time windows t1 and at different time intervals t2. In the non-limiting example illustrated, there are four time windows t1 and five time intervals t2, the last time interval t2 being between the last transmission of the pure carrier signal 21a and the response of the hands-free identifier 10, namely the sending of a primary measurement RSSI1 via an RF frame (illustrated RF in the figure) in the non-limiting example taken.
• RF frame illustrated RF in the figure
• FIG. 4 also shows the instants t4 when the hands-free identifier 10 performs a primary measurement RSSI1 on said location frame 2a, namely during the time windows t1 where the pure carrier signal 21a is transmitted.
• the hands-free identifier 10 will measure not only the field emitted by the pure carrier signal 21a, but also the noise 22a generated by the motor vehicle 6, during the 2nd transmission of the pure carrier signal 21a.
• the hands-free identifier 10 is configured to verify the presence of noise 22a according to two non-limiting embodiments illustrated in FIGS. 4 and 5 and described below.
• said hands-free identifier 10 checks for the presence of noise 22a by performing at least one power measurement on reception of a secondary received signal RSSI2, otherwise called secondary measurement RSSI2, between time windows t1 during time intervals t2 (illustrated sub-function f50 '(10, 22a, RSSI2)). Thus, it performs additional RSSI measurements at times when there is no field emitted by the motor vehicle 2, namely at the time when there is no transmission of a pure carrier signal 21a. If said at least one reception power measurement of a secondary received signal RSSI2 is greater than a primary threshold si, there is noise 22a.
• a secondary received signal RSSI2 otherwise called secondary measurement RSSI2
• the information 1a of the absence or presence of noise 22a comprises all the secondary measurements RSSI2 carried out.
• the hands-free identifier 10 informs the hands-free device 20 of the presence or absence of noise 22a by returning all the secondary measurements RSSI2 carried out via an RF frame. The latter checks whether at least one of them is greater than the primary threshold si and deduces therefrom whether there is noise 22a or not (illustrated function f6 (20, RSSI2, si)).
• the information 1a of the absence or presence of noise 22a is updated with a primary value vl which indicates the presence of noise 22a (illustrated sub-function f51 '(10 , la, vl)).
• the primary value v1 is equal to seven.
• the hands-free identifier 10 returns the information la of the absence or presence of noise 22a to the hands-free device 20 of the motor vehicle 2 via an RF frame.
• the primary value v1, here seven in the example of noise 22a is encoded on one bit.
• said motor vehicle 2 knows that there is noise and will not take any action (unlocking or locking), and will wait for the following location frame 2a to act or not. It will be noted that if there is no external signal 2a ', in this case the secondary measurement RSSI2 will be below the primary threshold if even equal to zero.
• said hands-free identifier 10 verifies the presence of noise 22a by performing a plurality of power measurements in reception of a primary received signal RSSI1 on said pure carrier signal 21a (sub-function f52 '(10, 22a, RSSI1) and by calculating an average ml on said power measurements in reception of a primary received signal RSSI1 (sub-function f53' (10, RSSIl (tl ), ml)).
• the hands-free identifier 10 performs four power measurements on reception of a primary received signal RSSI 1.
• the hands-free identifier 10 performs these four primary measurements RSSI1. This makes it possible to bring more precision to the measurement of the field.
• the hands-free identifier 10 will make four acquisitions ns in the non-limiting example taken. From the four measurements, on each axis X, Y and Z, it calculates the average ml of the four acquisitions for each time window t1. It will be noted that in other non-limiting embodiments, the hands-free identifier 10 can realize two, eight, sixteen etc. primary measures RSSI1.
• the hands-free identifier 10 reconstructs the amplitude of the magnetic field by making the quadratic sum m3 of the means ml of all the time windows, on the three axes X, Y and Z. If there is noise 22a on an axis, in non-limiting embodiments, the identifier hands-free 10 updates either the mean ml with a secondary value v2 on this axis, or the squared sum m3 with a secondary value v2 (illustrated sub-function f55 '(10, m3, v2)). In a non-limiting example, this secondary value v2 is equal to zero.
• the information 1a of the absence or presence of noise 22a is thus equal to the quadratic sum m3. If the information 1a of the absence or presence of noise 22a is equal to zero, this indicates that the primary measurement RSSI1 has been disturbed by an external signal 2a '.
• the hands-free identifier 10 sends back the information 1a of the absence or presence of noise 22a to the hands-free device 20 of the motor vehicle 2.
• the information la of the absence or presence of noise 22a is returned. via an RF frame.
• said motor vehicle 2 knows that there is noise 22a and will not take any action (unlocking or locking), and will wait for the following location frame 2a to act or not.
• an external signal 2a ' such as a location frame 2a' originating from another motor vehicle 2
• the hands-free identifier 10 will measure the field of the external signal 2a 'which will be superimposed on that of the pure carrier signal 21a of the location frame 2a , which may again lead to the wrong decision of the motor vehicle 2.
• the hands-free device 20 of the motor vehicle 2 is further configured to re-transmit a location frame 2a immediately (for example after a delay of 50ms to 100ms) after having received a response from the identifier 10 (namely after having received a primary measurement RSS1) to confirm the primary measurement RSSI1 carried out for each time window t1 (illustrated function f7 (20, 2a)).
• a location frame 2a immediately (for example after a delay of 50ms to 100ms) after having received a response from the identifier 10 (namely after having received a primary measurement RSS1) to confirm the primary measurement RSSI1 carried out for each time window t1 (illustrated function f7 (20, 2a)).
• the other motor vehicle 6 will in general not be synchronized with the motor vehicle 2. Therefore, in general the location frame 2a 'will not be transmitted at the same. transmission frequency as the location frame 2a.
• the location frame 2a On the next transmission of the location frame 2a, the location frame 2a 'will be shifted differently with respect to the location frame 2a, and the modulated signal 20'a or the pure carrier signal 21'a of the locate frame 2a 'will fall between the time windows t1 of the locate frame 2a. Therefore, if there is noise 22a, the new primary measurement RSSI1 on the new transmission of the location frame 2a will be different from that made on the first transmission of the location frame 2a. In a non-limiting embodiment, the location frame 2a is re-transmitted once, therefore it is transmitted twice in a row.
• the hands-free identifier 10 is judged to be outside the zones ZI or Z2 after the two transmissions, this means that there is noise 22a or that it is outside these zones ZI or Z2. Thus, this makes it possible to combat an asynchronous noise 22a with respect to the pure carrier signal 21a of the location frame 2a.
• a motor vehicle 6 transmits a location frame 2a 'at exactly the same frequency as the location frame 2a transmitted by the motor vehicle 2, the external signal 2a' and the frame of location 2a thus being synchronized.
• an external signal 2a ' such as a location frame 2a' originating from another motor vehicle 2
• the transmission period T1 between two location frames 2a is modified randomly.
• the transmission of the following location frame 2a and 2a 'from the two motor vehicles 2 and 6 does not take place at the same time. So the two motor vehicles 2 and 6 no longer pollute each other.
• the hands-free access device 20 is also configured to periodically send said location frame 2a according to a period T1, said period Tl being modified randomly (illustrated function f8 (20, 2a, Tl, ql) with a determined hazard. ql.
• the period T1 is approximately three hundred milliseconds.
• the determined random ql is between 0 and 50 ms.
• this makes it possible to shift the periods d 'emission of the location frame 2a with respect to an external signal 2a', and thus to have a transmission frequency specific to the motor vehicle 2.
• this makes it possible to fight against a noise 22a synchronous with respect to the pure carrier signal 21a of the location frame 2a.
• said hands-free identifier 10 may not be able to decode said location frame 2a, namely in particular to recover the pure carrier signal 21a of said location frame 2a, because it is too disturbed by the external signal 2a '.
• the motor vehicle 2 will then consider the hands-free identifier 10 as being absent from the zone Z1, from the zone Z2 and from the zone Z3. In order to be sure that the hands-free identifier 10 is absent, in a non-limiting embodiment, the motor vehicle 2 will use an absence counter cl. After a certain number of tests equal to a tertiary threshold s3, when the hands-free identifier 10 does not respond, the motor vehicle 2 will really consider the hands-free identifier 10 as being absent, and it will be able to make its decision as per example lock. Thus, this makes it possible to confirm the absence of the hands-free identifier 10 in one of the zones Z1, Z2 or Z3.
• said hands-free access device 20 is further configured for:
• the hands-free device 20 will lock the motor vehicle 2.
• This non-limiting embodiment makes it possible to have additional protection for locking the motor vehicle 2 and to provide robustness for access to the motor vehicle 2.
• the hands-free access system 1 to a motor vehicle 2 described is configured to implement a hands-free access method 4 to a motor vehicle 2.
• the hands-free access method 4 is illustrated in Figure 7 and includes the following steps:
• a step E1) illustrated F1 (20, 2a (20a, 21a)) the hands-free access device 20 of said vehicle 2 transmits a location frame 2a, said location frame 2a comprising a modulated signal 20a and a pure carrier signal 21a transmitted during time windows t1 at different time intervals t2.
• the time intervals t2 are regular.
• the time windows tl are regular.
• the time intervals t2 and the time windows t1 can be equal or different.
• a step E2) illustrated by F2 (10, 2a (20a, 21a) the hands-free identifier 10 receives the location frame 2a sent by the hands-free device 20 of the motor vehicle 2.
• the hands-free identifier 10 performs at least one measurement of the power in reception of a primary received signal RSSI1 on said pure carrier signal 21a of said location frame 2a.
• the hands-free identifier 10 sends the hands-free device 20 said at least one measurement of the power in reception of a primary received signal RSSI1.
• the sending is done via an RF frame using the identification code of the motor vehicle 2.
• step E5) illustrated by F5 (20, RSSI1) the hands-free access device 20 receives said at least one measurement of the power in reception of a primary received signal RSSI1.
• step E6 the hands-free identifier 10 checks for the presence of noise 22a in said location frame 2a.
• a step E7) illustrated F7 (10, 20, la (22a)) the hands-free identifier 10 sends to said hands-free access device 20 information la of the absence or presence of noise 22a in said device. location frame 2a.
• the hands-free access device 20 receives said information la of the absence or presence of noise 22a.
• a step E9) illustrated F9 (20, RSSI1, la, 2) as a function of said at least one measurement of the power in reception of a primary received signal RSSI1 and of said information la of absence or of presence of noise 22a in said location frame 2a, the hands-free device 20 authorizes or prohibits access to said vehicle 2.
• the hands-free device 20 does not authorize the unlocking of the motor vehicle 2 if the motor vehicle 2 was previously locked, or the hands-free device 20 locks the motor vehicle 2 if the motor vehicle 2 was previously unlocked.
• steps E3 and E6 are performed during the transmission of a location frame 2a. Furthermore, steps E4 and E7 are performed at the same time.
• the hands-free device 20 defines the distance from the identifier hands-free 10 with respect to said motor vehicle 2 and deduces therefrom the location zone Z1, Z2, or Z3 to which it belongs. Depending on the location zone Zl, Z2 or Z3 where the hands-free identifier 10 is found, the hands-free device 20 authorizes or not access to the motor vehicle 2. It will be noted that in another non-limiting embodiment, it is the hands-free identifier 10 which defines the distance relative to the motor vehicle 2 and which sends this distance back to the hands-free device 20 which takes the decision whether or not to authorize access to the motor vehicle 2. The calculation of a distance relative to an RSSI measurement being well known to the user. skilled in the art, it is not described here.

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• Engineering & Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Signal Processing (AREA)
• Physics & Mathematics (AREA)
• Mechanical Engineering (AREA)
• Quality & Reliability (AREA)
• Electromagnetism (AREA)
• General Physics & Mathematics (AREA)
• Mobile Radio Communication Systems (AREA)
• Lock And Its Accessories (AREA)

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• 2019
  • 2019-07-12 FR FR1907846A patent/FR3098626B1/fr active Active
• 2020
  • 2020-06-17 EP EP20732617.4A patent/EP3997673A1/de active Pending
  • 2020-06-17 WO PCT/EP2020/066830 patent/WO2021008803A1/fr unknown
  • 2020-06-17 US US17/625,891 patent/US11904810B2/en active Active

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