Device for a motor vehicle for operating a wireless module in different operating modes in an alternating manner

Abstract

The invention relates to a device (1) for a motor vehicle (2) for operating a wireless module (11) in different operating modes in an alternating manner, comprising a first wireless module (11) and a controller (10) for actuating the first wireless module (11). The controller (10) is designed to actuate the first wireless module (11) such that the first wireless module (11) is operated in a radar operating mode (B1) for a radar time frame and in a ranging operating mode (B2) for a ranging time frame, wherein in order to actuate the first wireless module (11), the controller (10) is designed to determine a radar duration (Z1) of the radar time frame, a ranging duration ((Z2) of the ranging time frame, a radar interval (11) between two respective successive radar time frames, and a ranging time interval (12) between two respective successive ranging time frames on the basis of weighting factors (G1 - G6) in the event of a change (X) in the weighting factors (G1 - G6) and / or in temporally defined intervals.

Description

[0001] Device for a motor vehicle for alternating operation of a radio module in different operating modes

[0002] Description:

[0003] The invention relates to a device for a motor vehicle for the alternate operation of a radio module in different operating modes, wherein this is in particular an ultra-wideband radio module which is to be operated alternately in a radar operating mode and in a ranging operating mode.

[0004] It is generally known in the prior art to operate a UWB radio module in a ranging mode, in which the distance between mobile units, particularly key units, and the UWB radio module or the vehicle is determined. Determining the distance is intended to trigger convenience functions, such as automatic unlocking of the vehicle, or prevent relay attacks on the vehicle.

[0005] Furthermore, the operation of a UWB radio module in a radar operating mode is also known, in which radar signals are transmitted into and received from the vehicle to detect persons. Persons can be identified, in particular, by detecting breathing movements through movement patterns determined using the radar signals. Such radar signals, transmitted into the interior of the vehicle, i.e., into the passenger compartment, and received from there, can be used to implement safety functions, such as child presence detection (CPD), which can prevent a child from being left behind in a vehicle.

[0006] Often, one radio module is provided for each function, so that the vehicle operates with a first UWB radio module in ranging mode and a second UWB radio module in radar mode. However, the two UWB radio modules can cause interference, as the transmitted and received signals can overlap or interfere with the other UWB radio module.

[0007] In principle, it would also be conceivable to operate a single UWB radio module alternately with fixed time windows and fixed intervals in the ranging mode and in the radar mode. However, this would result in high energy consumption, as the UWB radio module would operate continuously and possibly unnecessarily in one of the operating modes. On the other hand, depending on the environmental conditions and operating requirements, the tasks that the UWB radio module is supposed to perform in the respective operating mode may not be performed or may only be performed insufficiently, because the selected time window or interval is too short or too long for a particular operating mode.The invention is therefore based on the object of overcoming the aforementioned disadvantages and of providing a device, a system comprising such a device and a method by means of which a radio module can be operated safely and energy-efficiently in two operating modes fulfilling different functions.

[0008] This problem is solved by the combination of features according to the main claim and the subordinate claims.

[0009] According to the invention, a device for a motor vehicle for the alternate operation of a radio module in different operating modes is therefore proposed. The device has a first radio module and a control device for controlling the first radio module, wherein the first radio module is in particular a UWB radio module. Furthermore, the control device is designed to control the first radio module in a first operating mode, which can be referred to as radar operating mode, in such a way that signals, i.e. radio signals for detecting persons, are sent and / or received, in particular by the first radio module and / or at least one antenna connected to it. The signals sent and / or received in the radar operating mode can also be referred to as radar signals or radar pulses, wherein these distances orChanges in distance to objects are detected, movement patterns of the objects are determined from this and these can be recognized as breathing movements, it being possible to identify objects exhibiting breathing movements as a person and in particular as a child. The radar signals are emitted in particular into the passenger compartment or into the interior of the vehicle and received from there, for which the first radio module or the associated antennas can be arranged accordingly. Furthermore, the control device is designed to control the first radio module or the UWB radio module in a second operating mode, which can be referred to as a ranging operating mode, in such a way that signals, i.e. radio signals for determining location information, are sent and / or received by mobile units, in particular by the first radio module and / or at least one antenna connected to it. The location information is a position relative to the first radio module orthe vehicle and in particular a distance to the first radio module or the vehicle. The mobile units are in particular mobile key units, such as smart keys, smart fobs, mobile phones and the like, which can communicate with the vehicle or the device via a second radio module (mentioned below) and in particular serve to authenticate the respective carrier of the mobile unit to the device or the vehicle. Preferably, location information is not determined for all mobile units, but only for the mobile units which communicate with the second radio module, ie are connected to it via radio. In order to be able to operate an individual radio module, ie the first radio module, in both the radar operating mode and the ranging operating mode as required and thus to achieve or maintain coexistence of these operating modes.In order to implement coexistence management, the invention provides that the control device is designed to control the first radio module in such a way that the first radio module is operated alternately in the radar operating mode for a first time window, which can be designated as a radar time window, and in the ranging operating mode for a second time window, which can be designated as a ranging time window.In this case, the control device is further designed to control the first radio module by determining a radar time duration of the radar time window, a ranging time duration of the ranging time window, a first time interval between each two consecutive radar time windows, which can be designated as a radar interval, and a second time interval between each two consecutive ranging time windows, which can be designated as a ranging interval, as a function of weighting factors when the weighting factors change and / or at predetermined time intervals.

[0010] In short, the respective time windows and the intervals between the respective time windows are determined based on weighting factors, which allows the first radio module to be used for both functions. The weighting factors determine the use of the radio module depending on the requirements of the operating modes. Thus, the first radio module is not simply operated alternately in radar or ranging mode for fixed time windows, as the length of the time windows and the intervals between the time windows vary as needed.

[0011] This can also result in a gap between two time slots during which the first radio module is not operating in either radar mode or ranging mode, resulting in corresponding energy savings. Furthermore, two or more time slots of one operating mode can follow one another before one or more time slots of the other operating mode follow.

[0012] To avoid collisions that would require the first radio module to operate in both ranging mode and radar mode, various approaches can be chosen. For example, it can be specified that the time windows cannot be interrupted, meaning that one operating mode must first be processed according to the respective time window before the time window in the next operating mode can start. Additionally or alternatively, an operating mode, in particular the radar operating mode, can be prioritized so that it takes precedence in the event of a collision. Other rules are also possible. For example, it could be specified that the first radio module must operate in radar operating mode and in ranging operating mode at least once within a certain period of time.

[0013] A possible solution for this, for example, provides that both the time windows and the intervals are determined in the event of a change in the weighting factors at the beginning of a time window or at the end of a time window, whereby the weighting factor also includes how long the first radio module was operated in each of the operating modes in a past fixed time unit of, for example, one second, and whereby the weighting factor for the respective operating mode is higher the shorter the first radio unit was operated in the operating mode.

[0014] Furthermore, it can also be provided that the proportions of operation in the two operating modes are distributed between the two operating modes within a fixed time, for example, specified based on the time slots, depending on the weighting factors. If, for example, a multiple of the time slots is available as a fixed time, the ratio of the total weight for the radar operating mode to the total weight for the ranging operating mode can be used to determine what proportion of the available time slots the radar operating mode and the ranging operating mode have.In this case, the prior determination of a time interval between each two operating modes can be neglected, since the first radio module always switches immediately between the operating modes or there is a fixed time window without operating modes between the operating modes or after the time windows of the operating modes there is a time window without operating modes until the end of the specified time.

[0015] An advantageous variant provides that the radar time period is a multiple of a fixed time slot determined by a first multiplier, and the ranging time period is a multiple of the fixed time slot determined by a second multiplier. Furthermore, the radar interval is a multiple of the fixed time slot determined by a third multiplier, and the ranging interval is a multiple of the fixed time slot determined by a fourth multiplier. Furthermore, the control device is configured to determine the first multiplier, the second multiplier, the third multiplier, and / or the fourth multiplier as a function of weighting factors upon a change in the weighting factors and / or at predetermined time intervals.

[0016] Preferably, the device also has a second radio module, which is in particular a Bluetooth Low Energy (BLE) radio module. This second radio module is also connected to the control device in terms of signals. Furthermore, the second radio module is designed to establish a connection via radio with mobile units, i.e. with the mobile key units, and to communicate with them, in particular for the purpose of authenticating the respective carrier of the mobile unit to the vehicle, for which purpose encrypted signals and authenticators are exchanged. In ranging operating mode, the first radio module determines in particular the location information, i.e. the distance of the mobile units to which the second radio module is connected. The control device is designed to detect a number of mobile units connected to the second radio module as a first weighting factor.In particular, the number of currently connected mobile units is detected. Additionally or alternatively, the control device can be configured to detect the duration of a respective connection between the second radio module and the mobile units connected thereto as a second weighting factor.

[0017] Furthermore, the control device can be configured to assign to the connected mobile units a respective piece of location information determined by the first radio module and to detect at least one distance, determined by the respective location information, of at least one mobile unit from the first radio module as a third weighting factor. For example, the distance of the nearest mobile unit or several distances of the mobile units that are closest to or within a predetermined distance can be taken into account.

[0018] In addition, the control device can be designed to detect a number of persons detected with the first radio module as a fourth weighting factor and additionally or alternatively to detect a period of time elapsed since the last detection of a person as a fifth weighting factor.

[0019] To accommodate a user request, a priority factor, particularly adjustable by the user, can be stored in the control device as a sixth weighting factor for prioritizing the radar operating mode over the ranging operating mode. The priority factor can also be automatically activated or changed when the user leaves the vehicle.

[0020] It is preferably provided that the control device is designed to select the radar time duration to be longer and / or the ranging time duration to be shorter and / or the radar interval to be shorter and / or the ranging interval to be longer, the greater the distance of at least one mobile unit to the first radio module as the third weighting factor and / or the higher the time period elapsed since the last detection of a person as the fifth weighting factor and / or the higher the priority factor for prioritizing the radar operating mode as the sixth weighting factor.Additionally or alternatively, the control device can be designed to select a smaller radar time duration and / or a larger ranging time duration and / or a larger radar interval and / or a smaller ranging interval, the higher the number of mobile units connected to the second radio module as the first weighting factor and / or the higher the number of persons detected by the first radio module as the fourth weighting factor.

[0021] According to a first advantageous variant, the control device is configured to set a respective predetermined base value for the radar time period and / or the ranging time period and / or the radar interval and / or the ranging interval, particularly initially, i.e., upon starting the control of the first radio module. This base value can then be subsequently increased or decreased under corresponding triggers and conditions determined by the weighting factors.

[0022] Accordingly, the control device can be designed to extend the radar time period by a predetermined value and / or to shorten the ranging time period by a predetermined value and / or to shorten the radar interval by a predetermined value and / or to extend the ranging interval by a predetermined value if the distance of at least one mobile unit to the first radio module lies between two predetermined distance values ​​as a third weighting factor and / or if the elapsed time since the last detection of a person lies between two predetermined time values ​​as a fifth weighting factor and / or if the priority factor for prioritizing the radar operating mode corresponds to a predetermined value as a sixth weighting factor.

[0023] Furthermore, the control device can be designed to shorten the radar time period by a predetermined value and / or to extend the ranging time period by a predetermined value and / or to extend the radar interval by a predetermined value and / or to shorten the ranging interval by a predetermined value if the number of mobile units connected to the second radio module lies between two predetermined values ​​as a first weighting factor and / or the number of persons detected by the first radio module lies between two predetermined values ​​as a fourth weighting factor.

[0024] Such adjustments, i.e. the extension or shortening of the time periods and / or intervals, can also be carried out multiple times or successively and depending on several predetermined values ​​or predetermined value ranges, wherein the values ​​or the value ranges determined by them are stored in particular in the control device or can be retrieved by it.

[0025] For example, the radar time duration can be extended by 50 ms and / or the radar interval can be shortened by 50 ms if the radar operating mode has been prioritized and the sixth weighting factor is, for example, 1 instead of 0.

[0026] In addition, the number and distance of the mobile units, ie the first weighting factor and the third weighting factor, can be taken into account, whereby the shortening or lengthening can again be carried out multiple times or in loops based on several predetermined values ​​or predetermined value ranges.

[0027] If, for example, at least one mobile unit is less than or equal to 4 m from the vehicle or from the first radio module, the radar time duration is extended by, for example, 50 ms for each mobile unit (number) that meets this condition. In addition, it can be queried whether at least one mobile unit is between 4 and 6 m from the first radio module, wherein the radar time duration is extended by, for example, 25 ms for each mobile unit (number) that meets this condition. In addition, it can be queried whether at least one mobile unit is greater than 6 m from the first radio module, wherein the radar time duration is extended by, for example, 5 ms for each mobile unit (number) that meets this condition.With regard to the multipliers, the control device can be designed to determine the first multiplier and / or the fourth multiplier by adding the third weighting factor and / or the fifth weighting factor and / or the sixth weighting factor and / or subtracting the first weighting factor and / or the fourth weighting factor from a respective base value. Additionally or alternatively, the control device can be designed to determine the second multiplier and / or the third multiplier by subtracting the third weighting factor and / or the fifth weighting factor and / or the sixth weighting factor and / or adding the first weighting factor and / or the fourth weighting factor to a respective base value. In addition, a fixed correction factor can be taken into account.

[0028] Based on the multipliers M1 to M4, a respective base value GW1 to GW4, which can be stored in the control device, and the weighting factors G1 to G6, the following results, for example:

[0029] M1 = GW1 +G3+G5+G6-G1 -G4 M2 = GW2-G3-G5-G6+G1 +G4

[0030] M3 = GW3-G3-G5-G6+G1 +G4 M4 = GW4+G3+G5+G6-G1 -G4

[0031] Furthermore, the first radio module can be designed and / or arranged to detect persons in the vehicle in the radar operating mode and / or to determine location information from mobile units outside the vehicle in the ranging operating mode.

[0032] A further aspect of the invention relates to a vehicle with a device according to the invention. Furthermore, an aspect of the invention also relates to a system comprising a variable number of mobile units or mobile key units and a device according to the invention and / or a motor vehicle with a device according to the invention. In addition, an aspect of the invention relates to a method for transmitting and receiving radio signals via a radio module in various operating modes with variable time windows and time intervals assigned to the operating modes. In such a method, it is provided that the control device controls a first or the first radio module in a first operating mode, which can be designated as a radar operating mode, to send and / or receive signals for detecting persons.Furthermore, the control device controls the first radio module in a second operating mode, which can be referred to as a ranging operating mode, to send and / or receive signals for determining location information from mobile units.The first radio module is operated alternately in the radar operating mode for a first time window, which can be designated as a radar time window, and in the ranging operating mode for a second time window, which can be designated as a ranging time window, wherein the control device for controlling the first radio module determines a radar time duration of the radar time window, a ranging time duration of the ranging time window, a first time interval between each two consecutive radar time windows, which can be designated as a radar interval, and a second time interval between each two consecutive ranging time windows, which can be designated as a ranging interval, as a function of weighting factors when the weighting factors change and / or at predetermined time intervals, and controls the first radio module based thereon.

[0033] The features disclosed above can be combined as desired, as long as this is technically possible and they do not contradict each other.

[0034] Other advantageous developments of the invention are characterized in the subclaims or are presented in more detail below, together with the description of the preferred embodiment of the invention, with reference to the figures. They show: Fig. 1 shows a schematic structure of a device for alternating operation of a radio module in different operating modes;

[0035] Fig. 2 Dependencies for coexistence operation of the first radio module in the two operating modes;

[0036] Fig. 3 shows a first time sequence of the operation of the first radio module in the two operating modes;

[0037] Fig. 4 shows a second time sequence of the operation of the first radio module in the two operating modes;

[0038] Fig. 5 shows a method for operating the first radio module based on a flowchart.

[0039] The figures are schematic examples. Identical reference numerals in the figures indicate identical functional and / or structural features.

[0040] Figure 1 shows a device 1 for a motor vehicle 2 for alternately operating a radio module 11 in two different operating modes B1, B2, or a motor vehicle 2 with such a device 1. The device 1 has a control device 10, a first radio module 11, which in this case is a UWB radio module 11, and a second radio module 12, which in this case is a BLE radio module 12.

[0041] The control device 10 is designed to control the UWB radio module 11 in a radar operating mode B1 such that signals for detecting persons 20 are sent and / or received, and to control it in a ranging operating mode B2 such that signals for determining a distance D of the UWB radio module 11 to mobile units 30 are sent and / or received.

[0042] In order to organize a coexistence of the operating modes B1, B2 on the UWB radio module 11, ie an alternating operation of the UWB radio module 11 in the two operating modes as needed and required, it is provided that the control device 10 is designed to control the UWB radio module 11 such that the UWB radio module 11 is operated alternately for a radar time window in the radar operating mode B1 and for a ranging time window in the ranging operating mode B2, as is also shown in Figures 3 and 4.To control the UWB radio module 11, the control device 10 determines, depending on weighting factors G1 to G6, a radar time duration Z1 of the radar time window, a ranging time duration Z2 of the ranging time window, a radar time interval I1 between each two consecutive radar time windows and a ranging time interval I12 between each two consecutive ranging time windows, wherein the determination by the control device 10 is made upon a change X in the weighting factors G1 to G6 and / or at predetermined time intervals.

[0043] The dependencies for determining the time periods Z1, Z2 for operation in the operating modes B1 and B2 are shown as an example in Figure 2.

[0044] An algorithm A for determining at least the radar time period Z1 and the ranging time period Z2 is stored in the control device 10, according to which the UWB radio module 11 is operated in the radar operating mode B1 and in the ranging operating mode B2.

[0045] Algorithm A is based on the weighting factors G1 and G3 to G6 as input values.

[0046] With algorithm A, the radar time duration Z1 becomes longer and the ranging time duration Z2 becomes shorter the greater the distance of at least one mobile unit 30 from the UWB radio module 11 as the third weighting factor G3, the higher the time elapsed since the last detection of a person 20 as the fifth weighting factor G5, and the higher the priority factor for prioritizing the radar operating mode B1 as the sixth weighting factor G6. Furthermore, the radar time duration Z1 becomes shorter and the ranging time duration Z2 becomes longer the higher the number of mobile units 30 connected to the BLW radio module 12 as the first weighting factor G1 and the higher the number of persons 20 detected by the UWB radio module 11 as the fourth weighting factor G4.

[0047] The number of mobile units 30 connected to the BLE radio module 12 as the first weighting factor G1 is transmitted from the BLE radio module 12 to the control device 10.

[0048] The weighting factors G3, G4 and G5 are provided to the control device 10 by the UWB radio module 11.

[0049] The priority factor for prioritizing the radar operating mode B1 as the sixth weighting factor G6 is stored in the control device 10 or can be read out by it from a memory, wherein the priority factor can be set by a user.

[0050] The UWB radio module 11 is controlled by the algorithm A or by the control device 10 in such a way that it is operated successively in the radar operating mode B1 and in the ranging operating mode B2, as shown in Figures 3 and 4.

[0051] According to the dependencies illustrated in Figure 2, in this specific variant, the duration of a respective connection between the second radio module 12 and the mobile units 30 connected thereto is not taken into account as a second weighting factor G2. In an alternative not illustrated but essentially corresponding to the variant according to Figure 2, however, the weighting factor G2 can be considered as an input value for the algorithm A alongside the weighting factors G1 and G3 to G6. In such an embodiment, the second weighting factor G2 is provided to the algorithm A or the control device 10 by the BLE radio module 12.For example, it can be provided that only the number of mobile units connected to the second radio module 12 are taken into account in the first weighting factor G1, which are already connected to the BLE radio module 12 for a certain minimum time according to the weighting factor G2, whereby short-term connections which would falsify the values ​​determined by the algorithm A are not taken into account.

[0052] For both Figure 3 and Figure 4, the parameters required for controlling the UWB radio module 11, ie the time periods Z1, Z2 of the time windows or the time intervals 11, 12 between the time windows, are redetermined by the algorithm A or by the control device 10, preferably at the time X of a change in the weighting factors G1 to G6, wherein additionally or alternatively a redetermination can also be provided at fixed times or at fixed intervals.

[0053] Figure 3 shows a variant in which the control unit 10 determines time periods Z1, Z2 and time intervals I1, I2 for both operating modes B1, B2 depending on the weighting factors G1 to G6. Since this could result in a collision in which the UWB radio module 11 would have to be operated in both the radar operating mode B1 and the ranging operating mode B2, a rule is provided for handling such collisions, according to which the radar operating mode B2 always takes priority over the ranging operating mode B1 in the event of a collision to prevent harm to persons 20.

[0054] Figure 4 shows an alternative variant in which the distribution between the operating modes B1, B2 is determined for a fixed, predetermined time interval T from a multiple of a time slot S. In simplified terms, the weighting factors G1 to G6 are converted into a total radar weight for the radar operating mode B1 according to a first formula and into a total ranging weight for the ranging operating mode B2 according to a second formula. The ratio of the total radar weight and the total ranging weight is then used to determine the ratio of the time windows Z1, Z2 within the time interval T, whereby the time windows Z1, Z2 must each correspond to at least one time slot S and / or a multiple of the time slot S.

[0055] Referring to Figure 4, it is also clearly visible that the ratio of the operating modes to each other before the change X is 2 to 3 and after the change X is 3 to 2.

[0056] Algorithm A, or the procedure for determining the time periods Z1 and Z2, is also illustrated in Figure 5 in a flowchart format. At decision nodes, "1" represents "yes" or "condition met," and "0" represents "no" or "condition not met."

[0057] The steps are as follows:

[0058] 101 Start

[0059] 102 Number of persons 20 detected by the UWB radio module 11 in radar operating mode B1 in vehicle 2 is set to 0

[0060] 103 Number of mobile units connected to the BLE radio module 12 30 is set to 0

[0061] 104 Time since the last detection of a person 20 by the UWB radio module 11 in radar operating mode B1 in the vehicle 2 is set to a predetermined value, for example 1000 s

[0062] 105 Radar time duration Z1 is set to a predetermined value, for example 50 ms BLE radio module 12 establishes a connection with mobile units 30 Comparison of the number of previously connected mobile units 30 with the currently connected mobile units. Has the number of connected mobile units 30 changed? If yes, continue to 108. If no, continue to 123 Is the number of connected mobile units 30 greater than 0? If yes, continue to 109. If no, continue to 112 Has the radar operating mode been prioritized by a prioritization factor, in particular by user input or implicitly by leaving vehicle 2? If yes, continue to 113. If no, continue to 110 Transmission of the time windows Z1, Z2 to the UWB radio module 11 or operation of the UWB radio module 11 according to the time windows Z1, Z2 Determination of the distance D between mobile unit 30 and the vehicle 2 orthe UWB radio module 11 Reducing the radar time window Z1 to 5 ms Increasing the ranging time window Z2 Is a mobile unit 30 within a predetermined distance of, for example, 4 m from the vehicle 2 or the UWB radio module 11? If yes, continue to 116. If no, continue to 117 Is a mobile unit 30 within a predetermined distance of, for example, 6 m from the vehicle 2 or the UWB radio module 11? If yes, continue to 117. If no, continue to 118 116 For each connected mobile unit 30 (number), the radar time period Z1 is increased by 50 ms.

[0063] 117 For each connected mobile unit 30 (number), the radar time duration Z1 is increased by 25 ms

[0064] 118 For each connected mobile unit 30 (number), the radar time duration Z1 is increased by 5 ms

[0065] 119 to 122 Transmission of the time windows Z1 , Z2 to the UWB radio module 11 or operation of the UWB radio module 11 according to the time windows Z1 , Z2

[0066] 123 UWB radio module 11 detects persons 20 or provides the number of detected persons 20 to the control device 10

[0067] 124 Compare the number of previously detected persons (20) with the currently detected persons (20). Has the number of detected persons (20) changed? If yes, go to 125. If no, go to 106.

[0068] 125 Is the number of detected persons 20 greater than 0? If yes, go to 126. If no, go to 106

[0069] 126 Determination of a time period since the last detection of a person 20 by the UWB radio module 11

[0070] 127 Is the time since the last detection of a person 20 by the UWB radio module 11 less than 100 s? If yes, continue to 129. If no, continue to 128

[0071] 128 Is the time since the last detection of a person 20 by the UWB radio module 11 less than 1000 s? If yes, continue to 130. If no, continue to 131. 129 For each person 20 detected (number), the radar time period Z1 is increased by 50 ms.

[0072] 130 For each person 20 detected (number), the radar time duration Z1 is increased by 25 ms 131 For each person 20 detected (number), the radar time duration Z1 is increased by 5 ms

[0073] 132 to 134 Transmission of the time windows Z1 , Z2 to the UWB radio module 11 or operation of the UWB radio module 11 according to the time windows Z1 , Z2

Claims

Patent claims 1 . Device (1) for a motor vehicle (2) for the alternate operation of a radio module (11) in different operating modes, comprising a first radio module (11) and a control device (10) for controlling the first radio module (11), wherein the control device (10) is designed to control the first radio module (11) in a radar operating mode (B1) such that signals for detecting persons (20) are sent and / or received, and in a ranging operating mode (B2) such that signals for determining location information from mobile units (30) are sent and / or received, characterized in that the control device (10) is designed to control the first radio module (11) such that the first radio module (11) is operated alternately for a radar time window in the radar operating mode (B1) and for a ranging time window in the ranging operating mode (B2),and to control the first radio module (11), a radar time duration (Z1) of the radar time window, a ranging time duration (Z2) of the ranging time window, a radar time interval (11) between each two consecutive radar time windows, and a ranging time interval (12) between each two consecutive ranging time windows as a function of weighting factors (G1 - G6) upon a change (X) in the weighting factors (G1 - G6) and / or at predetermined time intervals.

2. Device according to claim 1, wherein the radar time period (Z1) is a multiple of a fixed time slot (S) determined by a first multiplier (M1) and the ranging time period (Z2) is a multiple of the fixed time slot (S) determined by a second multiplier (M2), wherein the radar interval (11) is a multiple of the fixed time slot (S) determined by a third multiplier (M3) and the ranging interval (12) is a multiple of the fixed time slot (S) determined by a fourth multiplier (M4), and wherein the control device (10) is designed to determine the first multiplier (M1), the second multiplier (M2), the third multiplier (M3) and / or the fourth multiplier (M4) as a function of weighting factors (G1 - G6) upon a change (X) in the weighting factors (G1 - G6) and / or at time-determined intervals.

3. Device according to claim 1 or 2, further comprising a second radio module (12) which is connected to the control device (10) by signaling, wherein the second radio module (12) is designed to establish a connection with mobile units (30) via radio, and wherein the control device (10) is designed to detect a number of mobile units (30) connected to the second radio module (12) as a first weighting factor (G1) and / or to detect a duration of a respective connection between the second radio module (12) and the mobile units (30) connected thereto as a second weighting factor (G2).

4. Device according to one of the preceding claims, wherein the control device (10) is designed to assign to the connected mobile units (30) a respective associated location information determined by the first radio module (11) and to detect at least one distance, determined by the respective location information, of at least one mobile unit (30) to the first radio module (11) as a third weighting factor (G3).

5. Device according to one of the preceding claims, wherein the control device (10) is designed to detect a number of persons (20) detected with the first radio module (11) as a fourth weighting factor (G4) and / or to detect a period of time elapsed since the last detection of a person (20) as a fifth weighting factor (G5).

6. Device according to one of the preceding claims, wherein a priority factor for prioritizing the radar operating mode (B1) over the ranging operating mode (B2) is stored in the control device (10) as a sixth weighting factor (G6).

7. Device according to one of the preceding claims, wherein the control device (10) is configured to select the radar time period (Z1) to be longer and / or the ranging time period (Z2) to be shorter and / or the radar interval (11) to be shorter and / or the ranging interval (I2) to be longer, the greater the distance of at least one mobile unit to the first radio module as the third weighting factor (G3) and / or the higher the time period elapsed since the last detection of a person as the fifth weighting factor (G5) and / or the higher the priority factor for prioritizing the radar operating mode as the sixth weighting factor (G6), and / or to select the radar time period (Z1) to be shorter and / or the ranging time period (Z2) to be longer and / or the radar interval (11) to be longer and / or the ranging interval (I2) to be shorter,the higher the number of mobile units connected to the second radio module as the first weighting factor (G1) and / or the higher the number of persons detected by the first radio module as the fourth weighting factor (G4).

8. Device according to one of the preceding claims, wherein the control device (10) is designed to set a predetermined base value for the radar time period (Z1) and / or the ranging time period (Z2) and / or the radar interval (11) and / or the ranging interval (I2) and / or to extend the radar time period (Z1) by a predetermined value and / or to shorten the ranging time period (Z2) by a predetermined value and / or to shorten the radar interval (11) by a predetermined value and / or to extend the ranging interval (I2) by a predetermined value,if the distance of at least one mobile unit (30) to the first radio module (11) lies between two predetermined distance values ​​as the third weighting factor (G3) and / or if the time elapsed since the last detection of a person (20) lies between two predetermined time values ​​as the fifth weighting factor (G5) and / or if the priority factor for prioritizing the radar operating mode (B1) corresponds to a predetermined value as the sixth weighting factor (G6), and / or to shorten the radar time period (Z1) by a predetermined value and / or to extend the ranging time period (Z2) by a predetermined value and / or to extend the radar interval (11) by a predetermined value and / or to shorten the ranging interval (I2) by a predetermined value,if the number of mobile units (30) connected to the second radio module (12) as the first weighting factor (G1) lies between two predetermined values ​​and / or the number of persons (20) detected by the first radio module (11) as the fourth weighting factor (G4) lies between two predetermined values.

9. Device according to one of the preceding claims 2 to 8, wherein the control device (10) is designed to control the first multiplier (M1) and / or the fourth multiplier (M4) by adding the third weighting factor (G3) and / or the fifth weighting factor (G5) and / or the sixth weighting factor (G6) and / or subtracting the first weighting factor (G1) and / or the fourth weighting factor (G4) with a respective base value and / or to determine the second multiplier (M2) and / or the third multiplier (M3) by subtracting the third weighting factor (G3) and / or the fifth weighting factor (G5) and / or the sixth weighting factor (G6) and / or adding the first weighting factor (G1) and / or the fourth weighting factor (G4) with a respective base value.

10. Device according to one of the preceding claims, wherein the first radio module (11) is designed and / or arranged to detect persons (20) in the vehicle (2) in the radar operating mode (B1) and / or to determine location information from mobile units (30) outside the vehicle (2) in the ranging operating mode (B2).

11. System comprising a variable number of mobile units (30) and a device (1) according to one of the preceding claims and / or a motor vehicle (2) with a device (1) according to one of the preceding claims.

12. Method for transmitting and receiving radio signals via a radio module (11) in different operating modes (B1, B2) with variable time windows of respective durations (Z1, Z2) assigned to the operating modes (B1, B2) and time intervals (Z1, Z2) therebetween, wherein the control device (10) controls a first radio module (11) in a first operating mode (B1), which is designated as radar operating mode(B1), transmits and / or receives signals for detecting persons (20), and in a second operating mode (B2), which can be referred to as a ranging operating mode (B2), transmits and / or receives signals for determining location information from mobile units (30), wherein the first radio module (11) is alternately operated in the radar operating mode (B1) for a first time window, which can be referred to as a radar time window, and in the ranging operating mode (B2) for a second time window, which can be referred to as a ranging time window, wherein the control device (10) for controlling the first radio module (11) has a radar time period (Z1) of the radar time window, a ranging time period (Z2) of the ranging time window, a first time interval (Z1) between each two consecutive radar time windows, which is referred to as a radar interval (11 ) can be designated,and a second time interval (I2) between each two consecutive ranging time windows, which can be designated as a ranging interval (I2), is determined as a function of weighting factors (G1 - G6) upon a change (X) of the weighting factors (G1 - G6) and / or at predetermined time intervals. * * * * *

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