Method for activating of at least one security function of a security system of a vehicle

Abstract

The invention relates to a method (100) for activating at least one security function of a security system (200) of a vehicle (1). According to the invention, provision is made for the detection of at least one distance information about a distance (A) of a mobile identification transmitter (300) to the vehicle (1) by means of a detection device (10) of the vehicle (1) and a transmission of the distance information by a data transmission from the detection device (10) via a transmission system (50) of the vehicle (1) to a processing device (60) of the vehicle (1), wherein the data transmission of the distance information is performed in a forgery-proof manner.

Claims

1. A method for an activation of at least one security function of a security system of a vehicle, comprising the following steps: a) detecting at least one distance information about a distance of a mobile identification transmitter to the vehicle by means of a detection device of the vehicle, b) transmitting the distance information to a processing device of the vehicle through a data transmission from the detection device via a transmission system of the vehicle, wherein at least one of the detection device, the processing device, and the transmission system comprises one or more of the following electronic components: an integrated circuit; a random number generator; a microprocessor; an application specific integrated circuit; a digital signal processor; and a correlation receiver wherein said one or more electronic components are configured to one or more of generate the distance information in an encrypted manner, or evaluate the encrypted distance information, by means of arithmetic information; and wherein the transmitting step is performed while the distance information is encrypted with the arithmetic information.

2. The method according to claim 1, wherein the following steps are carried out after step b): c) evaluating the distance information by the processing device, whereby a localization of the identification transmitter relative to at least one security zone of the vehicle is effected depending on the distance information, and d) determining a security information for the security system depending on the localization, wherein, due to the encryption of the distance information during the transmitting step, the distance information for the localization is protected against unauthorized manipulation.

3. The method according to claim 1, wherein the data transmission of the distance information from the detection device via the transmission system to the processing device is carried out in such an at least partially encrypted manner that a decryption for the evaluation of the distance information at least partially transmitted in an encrypted manner by the processing device can only be effected by means of a key information.

4. The method according to claim 1, wherein a key information for the decryption is stored in a non-volatile data storage unit of the vehicle in a manner to be protected against a read-out, wherein the non-volatile data storage unit is electrically connected to at least the processing device or a decryption device.

5. The method according to claim 1, wherein prior to step a), at least one of the following steps is provided: performing a distance determination by means of a processing unit of the identification transmitter, whereby the distance information is determined, transmitting the distance information from the identification transmitter to the detection device of the vehicle, wherein the transmission of the distance information is effected.

6. The method according to claim 1, wherein prior to step a), the following step is provided: performing a distance determination by means of the detection device, preferably by means of a detection evaluation unit of the detection device, whereby the distance information is determined.

7. The method according to claim 1, wherein a transmission of the distance information from the identification transmitter at least to the detection device or to the processing device of the vehicle is effected in such an encrypted manner that the identification transmitter performs an encryption based on a first key information, and at least the detection device or the processing device performs the decryption based on a second key information, which is different from the first key information.

8. The method according to claim 1, wherein the data transmission according to step b) is effected in such an encrypted manner that the detection device performs an encryption based on a first key information, and the processing device performs the decryption based on a second key information, which is different from the first key information.

9. The method according to claim 1, wherein at least one digital key information for the encryption of the distance information is provided and has at least a key length of 10 bit to 10000 bit.

10. The method according to claim 1, wherein at least one transmission of the distance information is effected in such an encrypted manner that a key information is changed temporally or alternately or on the basis of a cryptographic algorithm.

11. The method according to claim 1, wherein a distance determination is performed by an evaluation of a communication signal for the communication between the identification transmitter and the vehicle, wherein at least the distance or the distance information is determined by the distance determination.

12. The method according to claim 1, wherein a distance determination is performed by means of a signal transit time analysis of a communication signal, preferably an ultra-wideband signal, of a communication between a communication unit of the vehicle and a transceiver unit of the identification transmitter.

13. The method according to claim 1, wherein at least a communication between the identification transmitter and the vehicle via at least one communication signal is effected as a wireless communication by at least one of the following communication technologies: BLUETOOTH, BLUETOOTH Low Energy, ultra-wideband.

14. The method according to claim 1, wherein a communication field with a security zone is generated by a communication device of the vehicle.

15. The method according to claim 1, wherein a distance determination is performed by an evaluation of a communication signal for communication between the mobile identification transmitter and the vehicle, wherein the distance information is determined by the distance determination.

16. The method according to claim 15, wherein the distance information already includes the distance.

17. The method according to claim 15, wherein for the detection of the distance information by the detection device, the distance information is determined by the identification transmitter on the basis of a time of flight analysis.

18. The method according to claim 1, wherein the distance information comprises the distance.

19. A security system for a vehicle, comprising: at least one detection device of the vehicle for the detection of at least one distance information about a distance of a mobile identification transmitter to the vehicle, at least one processing device of the vehicle for the evaluation of the distance information, a transmission system of the vehicle for the transmission of the distance information through a data transmission from the detection device to the processing device, wherein at least one of the detection device, the processing device, and the transmission system comprises one or more of the following electronic components: an integrated circuit; a random number generator; a microprocessor; an application specific integrated circuit; a digital signal processor; and a correlation receiver wherein said one or more electronic components are configured to one or more of generate the distance information in an encrypted manner, or evaluate the encrypted distance information, by means of arithmetic information; wherein the data transmission of the distance information can be performed while the distance information is encrypted with the arithmetic information.

20. The security system according to claim 19, wherein the detecting device includes a communication device for communication with the identification transmitter with at least two communication units at the vehicle.

21. The security system according to claim 19, wherein a second communication unit of the vehicle includes at least a BLUETOOTH or LF or HF communication interface, which are at least partially different from the communication interfaces of a first communication unit of the vehicle.

22. The security system according to claim 19, wherein the transmission system includes at least one bus system, and an encryption device, or is electrically connected to the encryption device.

23. The security system according to claim 19, wherein the detection device includes at least one communication part at least for transmitting or receiving electromagnetic waves of a communication signal.

24. The security system according to claim 19, wherein at least one communication part is arranged on the roof of the vehicle, wherein the communication part is electrically connected to a communication device of the vehicle.

25. The security system according to claim 19, wherein the security system can be operated in accordance with at least a method for an activation of at least one security function of a security system of a vehicle, comprising the following steps: a) detecting at least one distance information about a distance of a mobile identification transmitter to the vehicle by means of a detection device of the vehicle, b) transmitting the distance information to a processing device of the vehicle through a data transmission from the detection device via a transmission system of the vehicle, wherein the data transmission of the distance information is effected while the distance information is encrypted with arithmetic information or includes a mobile identification transmitter for the activation of at least one security function of a security system of a vehicle and for the authentication at the security system of the vehicle, wherein a wireless communication can be performed between the identification transmitter and a communication device of the vehicle, wherein an encryption unit for the encrypted transmission of a distance information is provided.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

(1) Further advantages, features and details of the invention result from the following description, in which exemplary embodiments of the invention are described in detail with reference to the drawings. Here, the features mentioned in the claims and in the description can be essential to the invention individually or in any combination. The Figures show in:

(2) FIG. 1 a schematic side view of a vehicle,

(3) FIGS. 2, 3 and 4 schematic views of a vehicle in a plan view,

(4) FIGS. 5, 6 and 7 further schematic representations of a security system according to the invention,

(5) FIG. 8+9 further schematic representations of a security system according to the invention,

(6) FIG. 10 a further schematic representation of parts of a security system according to the invention,

(7) FIG. 11 a schematic plan view of a vehicle having a security system according to the invention, and

(8) FIG. 12 a schematic representation for visualizing a method according to the invention.

(9) The same reference characters are used for the same technical features even in different exemplary embodiments throughout the Figures.

DESCRIPTION OF SPECIFIC EMBODIMENTS OF THE INVENTION

(10) FIG. 1 schematically shows a vehicle 1 in a side view. In this case, the vehicle 1 includes at least parts of a security system 200 according to the invention. Thus, a communication unit 30 as well as a processing device 60 is provided on and/or in the vehicle 1. Optionally, a proximity sensor 2 for the detection of an approach of an operator of the vehicle 1 is arranged in the area of the door handle of the vehicle 1. The communication unit 30 serves for the communication with a mobile identification transmitter 300. To that end, a communication field K is generated by the communication unit 30, wherein information is transmitted wirelessly via radio waves of the communication field K. For the communication with the mobile identification transmitter 300, communication signals S are received and/or sent by the communication unit 30, for example, preferably via the communication field K. In particular, the communication field K (as a UWB communication field K) serves for the transmission of UWB communication signals S, wherein in this case, the communication signal S uses radio waves (of the communication field K) in an especially wide frequency spectrum. Thus, the UWB communication signals S preferably include an especially wide frequency spectrum. Preferably, a frequency range with a bandwidth of at least 500 MHz is used for the communication field K and/or for the communication signal S. Accordingly, the communication signal S can be referred to as a wideband communication signal S.

(11) At least one security zone Z can be provided around the vehicle, wherein the extension of the security zone Z is particularly defined dependent upon the communication field K and/or a communication of the vehicle 1. This is schematically shown in FIG. 2, wherein the circular shape of the communication field K and/or of the security zone Z merely serves for illustration purposes. In reality, the range and/or extension of the security zone Z can likewise extend in an irregular manner, depending on the surroundings of the vehicle 1.

(12) The security zone Z and/or different security zones Z of the vehicle 1 can be determined or defined in different manners. Thus, the range of communication via the communication signal S is, in particular, determined by the extension of the communication field K. Depending on this physical limitation of the range, the security zone Z can be defined in accordance with a first possibility. In this case, a distance determination can be used in order to perform a determination of a distance A between the identification transmitter 300 and the vehicle 1. When the security zone Z is determined by the maximum reach of the communication field K, it can be assumed for distance determination that the identification transmitter 300 being located outside the security zone Z, e.g. in the event that communication is not existent. In this case, the distance determination is effected based upon the maximum communication range. Alternatively or additionally, it can be provided in accordance with a second possibility that the security zone Z is defined as a maximum distance to the vehicle 1, which is, for example, within the maximum communication range. For the determination of the distance, consequently, the communication is performed actively and received signals are evaluated. To that end, the distance determination must determine distance information about the actual distance A of the identification transmitter 300 to the vehicle 1. This can take place by a signal transit time analysis of the communication signal S, for example. The evaluation of the communication signal S for the distance determination corresponds, in particular, to an evaluation of the communication between the vehicle 1 and the identification transmitter 300 and/or to an evaluation of the communication field K.

(13) The distance determination and/or an evaluation of the distance information obtained thereby by a processing device 60 of the vehicle 1 allows a specific localization of the identification transmitter 300 relative to the security zone Z. The distance determination is initiated, for example, when an approach of the identification transmitter 300 is detected by a proximity sensor 2 of the vehicle 1. Alternatively or additionally, the distance determination can also be initiated as soon as communication of the vehicle 1 with the identification transmitter 300 is possible and/or a connection has been established for communication. Furthermore, the distance determination can also be initiated in that an entry of the identification transmitter 300 into a certain security zone Z is monitored, and the initiation of the distance determination takes place when or after entering the said zone.

(14) FIGS. 3 and 4 schematically show that likewise multiple security zones Z can be provided. For example, a first security zone Z1 and a second security zone Z2 as well as, as the case may be, a third security zone Z3 and/or further security zones Z can be provided at different distances to the vehicle 1. It is conceivable here that the third security zone Z3 having the smallest distance to the vehicle 1 forms a comfort zone Z3, wherein a localization of the identification transmitter 300 within the comfort zone Z3 (in particular merely) causes the activation of comfort functions. Such a comfort function is, for example, an activation of a front lighting system of the vehicle 1, which is particularly effected when the identification transmitter 300 enters the comfort zone Z3. Another comfort function is, for example the activation of a vehicle lighting system. The first security zone Z1 extends, in particular, at a greater distance from the vehicle 1 than the second security zone Z2. For example, the identification transmitter 300 is localized in the first security zone Z1 when a second communication is initiated by a second communication unit 32, for example a LF communication between the vehicle 1 and the identification transmitter 300. Here and/or dependent upon a further localization, for example the second communication, and/or in a successful pre-identification of the security system 200 with the identification transmitter 300, a first communication with a first communication unit 31 with the identification transmitter 300, preferably via ultra-wideband, can be initiated. Based upon this first communication, a distance determination can be re-conducted, for example through an evaluation of the communication signal S of the first communication, i.e. of a first communication signal S1. This renewed distance determination can preferably be repeated in a cyclic manner. If, now, a distance A of the identification transmitter 300 from the vehicle 1 is determined, by this renewed distance determination, to be equal to and/or smaller than the distance of the second security zone Z2 from the vehicle 1, a localization of the identification transmitter 300 within the second security zone Z2 is effected. Upon a successful localization of the identification transmitter 300 within the second security zone Z2, an authentication process can be initiated, for example. Now, a renewed distance determination can in turn be made. If, by this distance determination, a distance A of the identification transmitter 300 from the vehicle 1 is determined to be equal to and/or smaller than the distance of the third security zone Z3 from the vehicle 1, a localization of the identification transmitter 300 within the third security zone Z3 is effected. Upon a successful localization of the identification transmitter 300 within the third security zone Z3, a renewed authentication process can be performed and/or a comfort function can be activated and/or an access system of the vehicle 1 can be activated and/or a door and/or a lock of the vehicle 1 can be opened.

(15) FIGS. 5 to 7 show this process in a more detailed manner, in particular the first and second communication. The security system 200 includes at least one detection device 10 and/or at least one communication device 20 for performing communication. Here, the communication device 20 can, for example, be at least part of the detection device 10 of the vehicle 1. Thus, the communication device 20 and/or the detection device 10 can be electrically connected to one another, for example, and/or be formed as a (common), in particular electric, component. It is also conceivable that the communication device 20 receives the signals of communication, evaluates them, as the case may be, and particularly performs a distance determination and/or detects the distance information. Thus, the communication device 20 can also form the detection device 10 (or correspond to it), and/or vice versa. The communication device 20 and/or the detection device 10 includes at least one communication unit 30, preferably a first communication unit 31 and a second communication unit 32. The first communication unit 31 serves for a first communication with the identification transmitter 300 and the second communication unit 32 serves for a second communication with the identification transmitter 300.

(16) A first communication signal S1 is used for the first communication, and a second communication signal S2 is used for the second communication. According to FIG. 5, the first communication takes place, for example, via the first communication signal S1 for the distance determination. According to FIG. 6, the second communication can be used via the second communication signal S2, in order to transmit, for example, a wake-up signal to the identification transmitter 300, and/or also perform a distance determination. Just as well, the emission of the wake-up signal and the subsequent monitoring for a reply signal can be considered to be a distance determination (in regard to the maximum communication range, which is used as an indicator for the entry into a security zone Z and/or for the required distance A). According to FIG. 7, a first and second communication is used simultaneously. In this way, for example via the second communication, i.e. via the second communication signal S2, the distance determination can be performed, wherein the result of the distance determination (i.e. the distance information) is verified based on a further distance determination by the first communication with the first communication signal S1. It is also conceivable that an authentication is performed via the first and/or second communication. Furthermore, it can be provided that the first communication is only used in the event that the second communication is faulty, for example.

(17) FIG. 8 shows a schematic construction of a detection device 10 and/or a communication device 20 of a security system 200 according to the invention. Here, the detection device 10 and/or the communication device 20 includes at least one communication unit 30, in particular a first communication unit 31 and a second communication unit 32. The first communication unit 31 includes at least one first communication interface 31.1, in particular an ultra-wideband interface and/or a Bluetooth interface. The second communication unit 32 includes at least one second communication interface 32.1, preferably a LF interface and/or HF interface. FIG. 9 shows that optionally the first communication unit 31 may comprise at least one further first communication interface 31.2, preferably a Bluetooth interface. Likewise, the second communication unit 32 can include yet a further second communication interface 32.2, preferably a HF interface and/or a Bluetooth interface. The communication interfaces serve for performing the first and/or second communication via the corresponding communication technology. Furthermore, the communication interfaces can also be electrically connected to corresponding communication parts 35, such as antennas. Thus, the communication device 20 is capable of performing communication, via one or multiple communication technologies, with the identification transmitter 300. In particular, the communication device 200 can of course also only include one single (for example first) communication unit 30, 31 and/or only one single (for example first) communication interface, so that only one single (for example first) communication with the identification transmitter 300 is possible via one single communication technology, for example via ultra-wideband. After that, the information of the communication signals S received from the communication device 20 via the communication parts 35 are transmitted to a processing device 60 of the vehicle 1 via a transmission system 50 of the vehicle 1. The information, such as a distance information, can likewise be transmitted in an encrypted manner here. Optionally, the communication device 20 and/or each (or only one single) communication unit 30 and/or detection device 10 includes at least one encryption device 40 to that end. The encryption device 40 is, for example, formed as an integrated circuit, in particular as a security chip. During transmission via the transmission system 50, the information is transmitted by at least one transmission station 51 of the vehicle 1. The transmission system 50 is formed as a bus system of the vehicle 1, for example. The transmission station 51 is a bus user of the transmission system 50, for example.

(18) For performing the distance determination, the processing device 60 shown in FIGS. 8 and 9 can be used, which, for example, is configured as a central processing device 60 of a central vehicle electronics of the vehicle 1. Thus, the processing device 60 is, for example, centrally provided in the vehicle 1. The processing device 60 can preferably be arranged in the vehicle 1 in a (delimited) distributed manner and comprise multiple components. Alternatively, it is also possible that the processing device 60 is arranged centrally in the vehicle 1 in terms of space, for example as a single component. The components of the communication device 20 and/or of the detection device 10 can preferably be arranged in the vehicle in a distributed manner, wherein the communication units 30 (and/or the respective communication interfaces) can each be arranged and/or formed separately in the vehicle. Here, it is also conceivable, as an alternative, that the communication device 20 and/or the detection device 10 are arranged and/or formed in the vehicle 1 as a spatially-delimited component and/or are arranged and/or formed in the vehicle 1 in a spatially-delimited manner. Thus, the association of the communication units 30 to the communication unit 20 thus preferably corresponds to a strictly functional (logical) association.

(19) Alternatively or in addition, a distance determination can be performed by a detection evaluation unit 11 of the detection device 10 and/or the communication device 20. Furthermore, the detection/evaluation unit 11 and/or the processing device 60 comprises, for example, electronic components such as integrated circuits and/or processors to perform the distance determination and/or an evaluation of the distance information. For the evaluation of the distance information and/or for the distance determination, the processing unit 60 particularly comprises an evaluation device 61. In order that the distance information can be evaluated, it must preferably be decrypted first. To that end, the processing device 60 is electrically, in particular electronically, connected to a decryption device 62. As a matter of fact, the evaluation device 61 can optionally perform the decryption itself, so that no decryption device 62 must be provided. It is also conceivable that the processing device 60 is electrically connected to the data storage unit 63, wherein a digital key information for decryption is digitally stored in the data storage unit 63 in a manner readable to the processing device 60 and/or the evaluation device 61. The digital key information is, for example, a cryptographic key. The evaluation device 61 and/or the decryption device 62 and/or the data storage unit 63 of the processing device 60 can thereby be arranged on a common circuit board and/or be electrically connected to one another, as shown schematically by FIG. 9. In this case, the data storage unit 63 is only optionally to be provided as a separate component, which is illustrated by a dashed line in FIG. 9. Alternatively, the data storage unit 63 can likewise be integrated in the evaluation device 61 and/or in the decryption device 62, for example as a Flash memory.

(20) FIG. 10 shows a schematic structure of a mobile identification transmitter 300 of a security system 200 according to the invention. The mobile identification transmitter 300 includes a transceiver device 310, which serves for the communication with the vehicle 1, in particular with the communication device 20. In particular, the transceiver device 310 comprises at least one transceiver unit 320, preferably a first transceiver unit 321 for performing a first communication with the vehicle 1 and a second transceiver unit 322 for performing a second communication with the vehicle 1. Naturally, only one single (for example first) transceiver unit 320, 321 can be provided, so that only one (for example first) communication can be performed. The first transceiver unit 321 is, for example, configured for performing an ultra-wideband communication, and/or the second transceiver unit 322 is configured for performing HF and/or LF communication, for example. In this way, communication signals S, in particular a first communication signal S1 and/or a second communication signal S2, can be wirelessly transmitted to the communication device 20 of the vehicle 1. The transmission can be effected in an encrypted manner, for example, wherein an encryption unit 331 of the identification transmitter 300 is provided and/or electrically connected to the transceiver device 310 (directly or indirectly) to that end. Optionally, it is conceivable that a distance determination is also performed by the identification transmitter 300 based upon the communication signal S. To that end, for example, a processing unit 330 is used as a distance determination device 400.

(21) FIG. 11 shows a plan view of a vehicle 1, which comprises a security system 200 according to the invention. The security system 200 includes at least one communication device 20 here, which serves for the communication with an identification transmitter 300. FIG. 11 shows two different communication units 30 of the communication device 20, wherein, naturally, only one single of these communication devices 30 can be provided. In order to emit corresponding communication signals S by means of the communication device 20, the communication device 20 and/or the communication device 30 includes at least one communication part 35, which is formed as an antenna and/or as a satellite. Thus, a first communication part 35.1 can be arranged on a roof of the vehicle 1, for example. Furthermore, it is conceivable that even further communication parts 35, in particular a second communication part 35.2, are arranged on the side region of the vehicle 1 and/or on the roof of the vehicle 1. It is also conceivable that further first communication parts 35.1 are provided on the vehicle 1 in addition to the first communication part 35.1, which in each case serve for the first communication with the identification transmitter 300. To that end, the first communication part 35.1 or each first communication part 35.1 is electrically connected to a first communication unit 31 of the vehicle 1. The second communication part 35.2 or each second communication part 35.2 serves for the second communication by the second communication unit 32 and is electrically connected to the second communication unit 32 of the vehicle 1. The electric connection of the first communication part 35.1 to the first communication unit 31 and/or of the second communication part 35.2 to the second communication unit 32 is effected, for example, via electric lines and/or via a transmission system 50, with the information transmitted via the transmission system 50 being transmitted particularly in an encrypted manner. Alternatively or in addition, it is possible that the electric connection between the first communication unit 31 to the processing device 60 and/or the electric connection of the second communication unit 32 to the processing unit 60 is effected via the transmission system 50. Just as well, the information, in particular the distance information detected by the first communication unit 31, can be transmitted to the processing device 60 via the transmission system 50 in an encrypted manner. The processing device 60 particularly serves as a distance determination device 400 for the (additional) determination, verification and/or evaluation of the distance information. Thus, the security of the distance determination and/or of the evaluation of the distance information can be ensured by the encrypted transmission. The first communication part 35.1 and/or the second communication part 35.2 is/are formed, for example, as an antenna and/or transmitter and/or receiver for the communication, in particular by means of a UWB communication method. Preferably, the first communication part 35.1 and/or the second communication part 35.2 are arranged asynchronously (on the vehicle 1).

(22) FIG. 12 schematically shows a method 100 according to the invention. According to a first method step 100.1, at least one distance information about a distance A of a mobile identification transmitter 300 to the vehicle 1 is detected by a detection device 10 of the vehicle 1. According to a second method step 100.2, the distance information is transmitted to a, in particular, central processing device 60 of the vehicle 1 by a data transmission from the detection device 10 via a transmission system 50 of the vehicle 1. Furthermore, optionally according to a third method step 100.3, the distance information is evaluated by the processing device 60, whereby a localization of the identification transmitter 300 relative to the at least one security zone Z of the vehicle 1 is effected dependent upon the distance information. According to an optional fourth method step 100.4, a security information for the security system 200 is determined dependent upon the localization.

(23) The above explanation of the embodiments describes the present invention exclusively by way of examples. Individual features of the embodiments can naturally also be freely combined with one another, as far as technically reasonable, without departing from the scope of the present invention.

LIST OF REFERENCE CHARACTERS

(24) 1 Vehicle

(25) 2 Proximity sensor

(26) 10 Detection device

(27) 11 Detection evaluation device

(28) 20 Communication device

(29) 30 Communication unit

(30) 31 First communication unit

(31) 31.1 Communication interface, ultra-wideband interface

(32) 31.2 Communication interface, Bluetooth interface

(33) 32 Second communication interface

(34) 32.1 Communication interface, LF interface

(35) 32.2 Communication interface, HF interface

(36) 35 Communication part, antenna

(37) 35.1 First communication part

(38) 35.2 Second communication part

(39) 40 Encryption device

(40) 50 Transmission system

(41) 51 Transmission station

(42) 60 Processing device

(43) 61 Evaluation device

(44) 62 Decryption device

(45) 63 Data storage device

(46) 100 Method

(47) 100.1 First method step

(48) 100.2 Second method step

(49) 100.3 Third method step

(50) 100.4 Fourth method step

(51) 200 Security system

(52) 300 Identification transmitter

(53) 310 Transceiver device

(54) 320 Transceiver unit

(55) 321 First Transceiver unit

(56) 322 Second transceiver unit

(57) 330 Processing unit

(58) 331 Encryption unit

(59) 400 Distance determination device

(60) A Distance

(61) K Communication field

(62) S Communication signal

(63) S1 First communication signal of a first communication

(64) S2 Second communication signal of a second communication

(65) Z Security zone

(66) Z1 First security zone

(67) Z2 Second security zone

(68) Z3 Third security zone, comfort zone