EP4176528A1 - Betreiben einer kommunikationseinrichtung eines kraftfahrzeugs - Google Patents
Betreiben einer kommunikationseinrichtung eines kraftfahrzeugsInfo
- Publication number
- EP4176528A1 EP4176528A1 EP21727114.7A EP21727114A EP4176528A1 EP 4176528 A1 EP4176528 A1 EP 4176528A1 EP 21727114 A EP21727114 A EP 21727114A EP 4176528 A1 EP4176528 A1 EP 4176528A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- communication device
- electromagnetic waves
- polarized electromagnetic
- power
- received signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
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- 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
- G07C5/00—Registering or indicating the working of vehicles
- G07C5/008—Registering or indicating the working of vehicles communicating information to a remotely located station
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/10—Polarisation diversity; Directional diversity
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/201—Monitoring; Testing of receivers for measurement of specific parameters of the receiver or components thereof
- H04B17/202—Power received at the antenna
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/146—Uplink power control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/245—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account received signal strength
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/38—TPC being performed in particular situations
- H04W52/383—TPC being performed in particular situations power control in peer-to-peer links
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/38—TPC being performed in particular situations
- H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity
Definitions
- the invention relates to a method for operating a communication device of a motor vehicle, in which the communication device communicates with at least one other motor vehicle or at least with a stationary counterpart, for which purpose a wireless communication link based on linearly polarized electromagnetic waves is used is, wherein a transmission signal is sent out by the communication device with a predetermined transmission power for the use of the communication connection.
- the invention also relates to a communication device for arrangement in a motor vehicle, the communication device being designed to communicate with at least one other motor vehicle or at least one stationary counterpart, for which purpose a wireless communication link based on linearly polarized electromagnetic waves is used, with the communication device is designed to transmit a transmission signal with a predeterminable transmission power for the use of the communication connection.
- the invention also relates to a motor vehicle with a communication device for communicating with at least one other motor vehicle or at least one stationary counterpart.
- Communication devices of the generic type, in particular radio-based communication devices are known in the prior art. Occasionally they are also referred to as an active antenna unit or the like. Among other things, they serve to facilitate communication between vehicles and between stationary remote stations, for example infrastructure facilities such as traffic lights, traffic signs, and / or the like, in particular in the manner of a road-side unit (RSU). This is intended to achieve a traffic network.
- the traffic networking can include, for example, a communication-related networking of motor vehicles with one another and between motor vehicles and the infrastructure facilities.
- Such a traffic network is also referred to as Car2X (Vehicle-to-Everything; V2X) or the like.
- traffic networking between motor vehicles (English: Vehicle-to-Vehicle; V2V), motor vehicles-to-road (English: Vehicle-to-Road; V2R), motor vehicle-to-infrastructure (English: Vehicle-to- Infrastructure; V2I), motor vehicle-to-network (English: Vehicle-to-Network; V2N), motor vehicle-to-person (English: Vehicle-to-person; V2P) and the like.
- Traffic networking is intended to increase traffic safety, improve traffic efficiency and enable energy savings.
- traffic networking serves to enable at least partially autonomous driving.
- a traffic networking system or telematics system can be CV2X, for example.
- This is a cellular network which enables communication between motor vehicles (PC5) and communication between a motor vehicle and an infrastructure device (Uu).
- a telematics system is operated in a frequency range from approximately 5.905 GHz to approximately 5.925 GHz.
- the motor vehicle generally includes the corresponding communication device which is intended to enable networking within the framework of the telematics system.
- the communication device is usually connected to a control device in the motor vehicle, which communicates with the other motor vehicles and / or the infrastructure devices via the communication device.
- the control device can, for example, provide vehicle data of the motor vehicle for other motor vehicles and / or the infrastructure facilities.
- the control device can also receive data from other motor vehicles and / or the infrastructure facilities in order to use them, for example, to drive the motor vehicle.
- toll collection systems are known, also called ETC, which provide wireless toll collection for motor vehicles that uses radio-based communication that uses electromagnetic waves at a frequency of about 5.8 GHz, for example the toll collection system from Toll Collect TM.
- Overlapping frequency ranges or too small a frequency spacing can lead to disruptions in the operation of the above-mentioned telematics system in conjunction with the above-mentioned toll collection system.
- the communication between the motor vehicle, in particular an on-board unit (OBU) for toll collection (ETC-OBU), and a toll station can be disrupted when the vehicle passes the toll station, so that a release for passage at the Toll station is refused.
- This can be caused by the fact that the telematics system sends out a transmission signal with such a high power that the toll station side cannot receive or record the corresponding signal from an on-board unit (OBU) for toll collection.
- the telematics system is deactivated on the motor vehicle side in the area of a respective toll station in order to be able to carry out the communication between the toll station and the ETC-OBU undisturbed.
- the telematics system is reactivated.
- corresponding position data of the toll stations are available in the motor vehicle for the telematics system and are compared with a respective current position of the motor vehicle.
- JP 4944719 B2 proposes an antenna unit which has different antenna elements for the telematics system and toll collection, with which the mutual interference can be reduced.
- an improvement can be achieved on the vehicle side, but the problem remains that the toll station is designal of the communication device can be disrupted in such a way that the intended function of the toll collection is not guaranteed.
- US 2010/0304680 A1 discloses a method and a device for using transmission polarization in order to reduce interference in a primary signal that is present.
- the invention is therefore based on the object of improving a communication device in such a way that disturbances which can be caused by the outside of a transmission signal from the communication device at a toll station can be reduced.
- the invention proposes a method, a communication device and a motor vehicle according to the independent claims.
- the invention proposes in particular that the transmission power is reduced depending on the reception of a received signal by the communication device, which uses at least partially orthogonally polarized electromagnetic waves with respect to the linearly polarized electromagnetic waves.
- the communication device is designed to reduce the transmission power depending on receiving a received signal, which received signal uses at least partially orthogonally polarized electromagnetic waves with respect to the linearly polarized electromagnetic waves .
- the communication device is formed according to the invention. The invention is based, inter alia, on the idea that the communication device can recognize when a toll station is within communication range in order to reduce the transmission power of the transmission signal as a function thereof. The targeted reduction of the transmission power can ensure that the toll station is no longer disturbed when it receives a corresponding communication signal from the ETC-OBU, so that the toll collection function can be guaranteed more reliably when passing the toll station.
- the communication device which is preferably arranged in the motor vehicle, can recognize by evaluating the received signal that it is in a communication area with a toll station. For this purpose, the corresponding received signal is evaluated by the communication device.
- the invention makes use, among other things, of the fact that the telematics system generally produces essentially linear, in particular vertically, polarized electromagnetic waves
- the communication connection for toll collection usually uses circularly polarized electromagnetic waves. It follows that the communication connection of the toll collection system or the toll station at least partially uses horizontally polarized electromagnetic waves. This can be determined by a correspondingly trained communication device.
- the communication device in particular its receiving unit, can have a corresponding antenna unit which allows linear, in particular vertically, polarized electromagnetic waves and orthogonally, in particular horizontally, polarized electromagnetic waves to be received separately.
- a corresponding antenna unit which allows linear, in particular vertically, polarized electromagnetic waves and orthogonally, in particular horizontally, polarized electromagnetic waves to be received separately.
- Electrical signals supplied to the antenna unit can thus be used to determine whether a toll station is within communication range.
- the transmission power for a transmission signal from the communication device for the CV2X communication can be reduced accordingly, so that the communication connection to the toll station can preferably be essentially completely undisturbed.
- the reduction in the transmission power can include an adapted reduction so that the communication link between the vehicle-side ETC-OBU and the toll station can be reliably established.
- reducing the transmission power can also include switching off a transmission device of the communication device.
- the communication device can comprise a high-frequency circuit arrangement which is suitable for demodulating and / or decoding antenna signals provided by the antenna unit and, if necessary, to the control unit of the motor vehicle via a damping circuit, a filter circuit and / or the like to provide.
- the communication device can be used to supply data from the control unit, for example also via the filter circuit and / or the damping circuit, to the high-frequency circuit arrangement in order to be able to supply a corresponding high-frequency signal to the antenna unit.
- the high-frequency circuit arrangement can be equipped with a power measuring unit or a power measuring circuit. be coupled, by means of which, for example, a received power of the antenna signal can be determined.
- a transmission power of a transmission signal to be transmitted can be determined and / or set by means of a control unit to which the power measurement unit or the power measurement circuit is connected.
- the power measurement circuit can be coupled to a control unit in terms of communication or signal technology.
- the control unit is connected to the damping circuit, the damping of which can be set in a suitable manner by the control unit.
- the aforementioned elements are preferably part of the communication device.
- the communication device thus serves to establish the communication link between the vehicle-side control unit and at least the at least one of the motor vehicles or the at least one stationary counterpart in order to be able to implement the desired traffic networking.
- the communication device preferably also comprises the aforementioned antenna unit.
- the high-frequency circuit arrangement is preferably coupled for signaling purposes to an antenna element of the antenna unit, which serves to transmit and / or receive linear, in particular vertically, polarized electromagnetic waves.
- the antenna unit also has an antenna element which is used to receive horizontally polarized electromagnetic waves.
- This antenna element is preferably connected to a power combiner to which the other antenna element is also connected.
- the power combiner combines the antenna signals of the two antenna elements and supplies a power signal to a further power measuring unit or further power measuring circuit, which determines the power of the combined signal from the power combiner.
- the power determined in this way is made available to the control unit and evaluated by it. Since this power depends, among other things, on the horizontally polarized electromagnetic waves, it can thus be determined whether horizontally polarized electromagnetic waves are being received. This is then to be interpreted as an indication that a toll Station is within communication range or not.
- the control unit can thus determine from this whether a toll station is within communication range and, if such a toll station is detected within communication range, reduce the transmission power as a function of this.
- the control unit can implement this by appropriately controlling the damping circuit.
- the invention therefore does not react on the communication device side or on the motor vehicle side with regard to reception, but rather it influences the transmission power of the transmission signal as a function of the reception of the reception signal. There is thus the possibility of influencing the function of the toll station through the communication device and thus improving or even enabling reliable communication between the toll station and the ETC-OBU.
- the transmission signal can be sent out by the communication device at the beginning of the establishment of the communication connection.
- the transmission signal can also be transmitted at a later point in time while the communication connection is ongoing.
- the communication connection is not limited to sending the transmission signal.
- the communication connection preferably also includes receiving a received signal.
- a bidirectional communication connection can be established between the communication device and the other motor vehicle or the stationary counterpart.
- the communication connection can also be unidirectional and only be designed for one or more transmission signals to the outside.
- the invention is not restricted to this.
- the invention provides that the method control according to the invention can also be provided for an aforementioned unidirectional communication link, namely in order not to interfere with a receiving unit of the toll station when receiving a transmission signal from the ETC-OBU, for example.
- the invention can be used, for example, in a frequency range between approximately 1 GHz to approximately 20 GHz. However, it is not limited to this frequency range. Basically, the invention can also be used with comparable communication influences in which an external receiving point could be disturbed by a transmission signal.
- the transmission power is reduced if a received power of the received signal is greater than a predefined comparison value.
- This has the advantage that the transmit power does not need to be reduced for any receive power. Intervention is preferably only taken when a significant reception power for horizontally polarized waves is determined.
- a significance criterion can thus be specified by the specified comparison value, which is used to enable communication via the communication link to be operated undisturbed for as long as possible. In this way, the comparison value can be determined and specified on the basis of empirical function measurements carried out beforehand.
- a value of the transmission power is reduced as a function of a value of the reception power of the received signal. This makes it possible to react individually to the prevailing circumstances in the case of current communication via the communication link.
- the knowledge can be taken into account that with a greater distance between the toll station and the motor vehicle, a comparatively small reduction in the transmission power can already implement the reliable function of the communication between the toll station and the ETC-OBU.
- the transmission power of the transmission signal acts on the receiving unit of the toll station and can result in a malfunction.
- the transmission power should preferably be reduced so that the function of the communication link between the toll station and the ETC-OBU can continue to be maintained.
- This configuration has furthermore the advantage that the communication connection does not need to be interrupted, for example. Depending on the spatial conditions, it may even be possible to maintain continuous use of the communication link.
- the linearly polarized electromagnetic waves are vertically polarized electromagnetic waves and the orthogonally polarized electromagnetic waves are at least partially horizontally polarized electromagnetic waves, with a horizontal received power of a horizontal received signal part of the received signal and a vertical received power of a vertical received signal part of the received signal are detected and evaluated to determine the received power.
- the received signal parts are preferably detected separately from one another, for example by means of appropriately designed antenna elements of the antenna unit.
- the antenna elements can be designed and / or aligned accordingly for the reception of the respective polarization of the reception signal.
- a phase of the horizontal received signal part is set. This makes it possible to compensate for runtime differences that can occur due to the detection and / or evaluation of the received signal parts by the communication device, so that reliable functionality can be improved.
- the received power is generated from the horizontal received power and the vertical received power by means of a power combiner. As a result, the actual received power can be determined in particular in the case of received signals that use circularly polarized electromagnetic waves.
- the function of the communication device can be further improved as a result.
- the power combiner can be used to achieve a simple implementation for determining the received power of the received signal in order, for example, to be able to provide a control signal derived therefrom for the control unit of the communication device.
- control unit can control the high-frequency circuit arrangement and / or the damping circuit in a simple manner accordingly in order to be able to guarantee the reliability of the communication between the toll station and the ETC-OBU, preferably permanently.
- the current distance between the motor vehicle and the toll station can also be derived from the received power. This can be used for the further functionality of the invention and / or also for a higher-level vehicle control, in particular the control unit. It is determined whether the received signal uses circularly polarized electromagnetic waves. For this purpose, the vertical and the horizontal received signal part, in particular the horizontal received power and the vertical received power, can be evaluated.
- the vertical signal part in addition to a part that originates from exclusively vertically polarized electromagnetic waves, includes a further part that is caused by circularly polarized electromagnetic waves.
- Corresponding evaluation can therefore determine whether the received signal uses circularly polarized electromagnetic waves. This is particularly useful for the case in which the toll station uses circularly polarized electromagnetic waves for the communication link to the ETC-OBU.
- signals from the toll station can be easily distinguished from signals from the communication link of the communication device, which are essentially exclusively vertically polarized electromagnetic use netic waves.
- the evaluation can preferably be carried out by the control unit. Basically, however, there is also the possibility of at least partially providing a corresponding hardware circuit that at least partially realizes the corresponding evaluations.
- the communication device is designed to be coupled with a control device of a wireless toll collection system that can be arranged in the motor vehicle, in particular the ETC-OBU, and to use an antenna unit of this control device to establish the communication link.
- a control device of a wireless toll collection system that can be arranged in the motor vehicle, in particular the ETC-OBU
- This refinement has the advantage that the communication device does not require a separate antenna unit.
- the procedure according to the invention makes it possible to achieve that the communication device and the ETC-OBU can implement their respective communication connections almost undisturbed, so that the respective reliable function can also be realized. As a result, the effort for the communication device can be reduced.
- an interference problem can be solved, so that a coexistence of the two aforementioned systems can be achieved essentially undisturbed.
- the invention allows the communication device to detect in particular the circularly polarized received signal from the toll station and can adjust its gain for its own Sen designale in such a way that system-critical interference between the toll system and the CV2X infrastructure can be largely avoided.
- the problem of coexistence between CV2X systems and the toll systems, especially ETC toll systems, such as in China, can be solved. There is no need for time-consuming and costly measures with regard to the communication facility and the existing infrastructure, especially for the toll systems, preferential wise to be done in relation to the RSU and the ETC-OBU.
- the detection circuit according to the invention can be integrated into the communication device in a simple manner.
- the invention also includes the communication device for the motor vehicle.
- the communication device in particular the control unit, can have a data processing device or a processor device which is at least partially comprised by the control unit of the communication device and which is set up to carry out an embodiment of the method according to the invention.
- the processor device can have at least one microprocessor and / or at least one microcontroller and / or at least one FPGA (Field Programmable Gate Array) and / or at least one DSP (Digital Signal Processor).
- the processor device can have program code which is set up to carry out the embodiment of the method according to the invention when it is executed by the processor device.
- the program code can be stored in a data memory of the processor device.
- the invention also includes further developments of the communication device according to the invention which have features as they have already been described in connection with the further developments of the method according to the invention. For this reason, the corresponding / further developments of the communication device according to the invention are not described again here.
- the motor vehicle according to the invention is preferably designed as a motor vehicle, in particular special as a passenger car or truck, or as a passenger bus or motorcycle.
- Fig. 1 in a schematic perspective view of three motor vehicles and an RSU of a traffic networking system
- FIG. 2 shows a schematic top view of one of the motor vehicles in FIG.
- Fig. 1 with a communication device for the traffic network system and an ETC-OBU for a Mauterfas system;
- FIG. 3 shows a schematic diagram of an electrical field vector of a linearly vertically polarized electromagnetic wave
- Fig. 4 is a schematic block diagram representation of the communication device for the traffic networking system according to FIG. 2;
- FIG. 5 shows a schematic perspective view of a toll station of a toll collection system on a four-lane road as well as radio connection areas of transmitting / receiving devices of the toll station for recording ETC-OBU's of passing motor vehicles;
- FIG. 6 shows a schematic plan view of the toll station according to FIG. 5;
- FIG. 7 shows a schematic diagram of an electrical field vector of a left-handed circularly polarized electromagnetic wave
- 8 shows a schematic side view of a detail of the toll station according to FIG. 5 with a communication area of a transmitting / receiving device of the toll station
- Fig. 9 in a schematic representation, a coexistence consideration of CV2X and ETC on the basis of respective Nutzfrequenzspek tren;
- FIG. 10 shows a schematic block diagram illustration of the communication device according to FIG. 4 with a first embodiment of a supplementary detection circuit for detecting circularly polarized electromagnetic waves;
- FIG. 11 shows, in a schematic block diagram representation, the communication device according to FIG. 4 with a second embodiment of a supplementary detection circuit for detecting circularly polarized electromagnetic waves;
- FIG. 12 shows a schematic block diagram of the communication device according to FIG. 4 with a third embodiment of a supplementary detection circuit for detecting circularly polarized electromagnetic waves.
- FIG. 1 shows, in a schematic view, a traffic networking system 10 and three motor vehicles 14, 16, 18 traveling on a road 26.
- an RSU 12 is positi oned as a stationary counterpart.
- Each of the motor vehicles 14, 16, 18 has a control unit or a CV2X-OBU 30 with a communication device 32, 34 (FIGS. 2, 4), by means of which each of the motor vehicles 14, 16, 18 with the other of the motor vehicles 14 , 16, 18 or, alternatively or in addition, can also communicate with the stationary remote station 12.
- a respective wireless communication link 20, 22, 24 based on vertically polarized electromagnetic waves is used.
- the traffic networking system 10 is embodied here as a telematics system based on CV2X.
- This is a cellular network which enables communication between vehicles (PC5), as well as communication between a respective one of the motor vehicles 14, 16, 18 and a respective infrastructure facility, here the RSU 12.
- these communication links are 20, 22 (Uu).
- a frequency range for the communication connections 20, 22, 24 extends from about 5.905 GFIz to about 5.925 GFIz. This frequency range is preferably tailored to the requirements of automotive applications.
- the communication link 24 is a communication link between the motor vehicle 14 and the motor vehicle 16.
- a transmission signal is provided by the CV2X-OBU 30, which is sent out by means of the communication device 32, 34 with a predetermined transmission power.
- the traffic networking system 10 is embodied in the present case as a telematics system in accordance with CV2X.
- This is a cellular network plant that enables communication between vehicles (PC5) as well as communication between a respective vehicle and a respective infrastructure facility, here the RSU 12.
- these communication links are 20, 22 (Uu).
- a frequency range for the communication links 20, 22, 24 extends from approximately 5.905 GFIz to approximately 5.925 GFIz. This frequency range is preferably tailored to the requirements of automotive applications.
- the communication link 24 is a communication link between the motor vehicle 14 and the motor vehicle 16.
- Fig. 2 shows a schematic top view of one of the motor vehicles according to FIG. 1, namely the motor vehicle 14 in the present case.
- the two other motor vehicles 16, 18 are in the present case essentially comparable forms. Depending on the construction, however, they can also be designed differently.
- the motor vehicle 14 has the control unit 30, which is also referred to below as a CV2X-OBU.
- the control device 30 is connected to respective active antenna units or communication devices 32, 34 via respective antenna lines 36, 38. Via the communication devices 32, 34, the control device 30 can both send and receive radio signals. As a result, the communication connections 20, 22, 24 can be implemented.
- the communication device 32 is arranged as a CV2X antenna unit with a compensator on a roof of the motor vehicle 14.
- the other communication device 34 is arranged in the present case in a mirror base under a windshield of the motor vehicle 14. It can also be seen that an ETC-OBU 28, which is part of a toll collection system 68 (FIG.
- the toll collection system 68 is a satellite-supported toll collection system which is used to determine a toll depending on the use of the road 26.
- the active antenna units or communication devices 32, 34 also called CV2X compensators, serve this purpose. In the present case, these can amplify corresponding signals both in the transmit and in the receive mode.
- vertically polarized electromagnetic waves are also used for the communication connections 20, 22, 24.
- the gain by the communication devices 32, 34 can be set independently of one another in the transmit mode and in the receive mode. As a rule, a maximum transmission power of approximately 23 dBm at a base point of a corresponding antenna element of the communication device 32, 34 is aimed for for transmission operation.
- the communication devices 32, 34 each have at least one corresponding antenna element with which the transmission and reception of vertically polarized electromagnetic waves can be realized.
- FIG. 3 shows, in a schematic diagram, an electric field vector of a linearly vertically polarized electromagnetic wave with a graph 34.
- An abscissa is assigned to the direction of propagation K.
- the ordinate is assigned to the electromagnetic field strength.
- An amplitude of the field strength vector is denoted Evo.
- FIG. 4 shows, in a schematic block diagram representation, a communication device or active antenna unit 32, 34, such as is used for the traffic networking system 10.
- the communication device 32, 34 has an antenna element 40 which is designed to transmit and / or receive vertically polarized electromagnetic waves.
- the antenna element 40 is connected to a floch frequency circuit arrangement 50 which provides a corresponding electrical signal for the antenna element 40 in the transmission mode.
- the high-frequency circuit arrangement 50 provides a corresponding amplification and processing of the received signal.
- the high-frequency circuit arrangement 50 is also connected to an adjustable attenuation circuit 44.
- damping can be set as a function of a corresponding control signal both in the transmission mode and in the reception mode.
- the attenuation circuit 44 is also connected to a filter circuit 42.
- the filter circuit 42 for its part is then connected to the respective antenna lines 36, 38 via which the communication device 32, 34 is connected to the CV2X-OBU 30 in terms of communication technology.
- the communication device 32, 34 is therefore designed to be adapted for transmit / receive signals according to FIG. 3 and provides corresponding signals for the control device 30.
- corresponding signals for transmission by the communication device 32, 34 can be provided here.
- the high-frequency circuit arrangement 50 is also coupled to a power measurement circuit 48, by means of which a received power or a transmit power can be detected.
- the power measurement circuit 48 is connected to a control unit 46 of the communication device 32, 34, which in the present case is formed by a microcontroller.
- the control unit 46 provides the control signal for the damping circuit 44, which is why the control unit 46 is connected to the damping circuit 44.
- the attenuation circuit 44 can be adjusted accordingly by means of the control unit 46.
- the traffic networking system 10 must be able to function in coexistence with a toll collection system, such as the toll collection system 68 according to FIG. 5.
- the motor vehicle 14 therefore also includes a corresponding ETC-OBU 28, which is part of the toll collection system 68.
- the ETC-OBU 28 is essentially a type of transponder or an active one Antenna which is to be arranged as a rule on the windshield of the motor vehicle 14, 16, 18.
- FIG. 5 shows a schematic perspective view of a toll station 54 of the toll collection system 68 on a four-lane road 26 as well as club-shaped radio connection areas 58 of transmitting / receiving devices 56 of the toll station 54 a respective radio link area 58 is aligned accordingly. This enables wireless communication for each of the lanes of road 26
- FIG. 6 shows a schematic top view of the toll station 54 according to FIG. 5.
- FIG. 6 shows that the radio connection areas extend over a distance of approximately 10 m in front of the toll station 54 in the direction of travel.
- the radio connection areas 58 are also formed over a respective lane of the road 26 over the entire width.
- the ETC-OBU 28 When driving past the toll station 54, the ETC-OBU 28 communicates with the toll station 54 via a communication link of a respective radio link area 58. A respective payment process of the toll collection system 68 is processed via this communication link in the area also known as the tolling zone. This requires that an undisturbed data exchange or an undisturbed communication link between the respective ETC-OBU 28 and the corresponding transceiver 56 must be implemented at least in the tolling zone.
- FIG. 7 shows, in a schematic diagram representation like FIG. 3, an electric field vector of a left-hand circularly polarized electromagnetic wave with a graph 60, as it is transmitted by the transmitting / receiving devices 56 of the toll station 54.
- Typical properties of a corresponding antenna unit of the transmitting / receiving device 56 are shown in a schematic side view of a section of the toll station 54 according to FIG.
- An EIRP of about 33 dBm is achieved in one main drop direction (FIG. 8).
- a main lobe of the antenna unit of the transceiver 56 illuminates the tolling zone.
- the toll collection system 68 In practical use, the toll collection system 68 must be able to be operated at the same time as the traffic networking system 10. As can be seen from the above, at least in the area of the tolling zone, interference phenomena or disturbances in the two systems can occur. A major reason for this is the small frequency spacing between the useful frequency spectra of CV2X and ETC, which in the present case is less than 100 MHz. It is therefore to be assumed that transmission signals of the communication device 32, 34 can interfere with the transmission / reception device 56 of the toll station 54, in particular when receiving, whereby the corresponding communication connection to the ETC-OBU 28 may be disturbed. There are currently no suitable filter devices available with which a corresponding decoupling or selectivity could be achieved. 9 shows the problem with regard to the interference or coexistence problems. In a schematic representation as part of a
- a transmitting / receiving device 56 and a communication device 32, 34 are shown schematically, on each of which a filter function is shown schematically arranged, which uses a conventional good filter 66. It can be seen that, in spite of the filter 66, both the transmitting / receiving device 56 and the communication device 32, 34 can each receive significant signal components from the respective other system. This results in an area in which interference or coexistence problems can occur. This Be rich is marked in Fig. 9 with 62.
- Fig. 10 now shows in a schematic block diagram representation the communication device 32, 34 or the active respective antenna unit according to a first embodiment, which has a supplementary detection circuit for detecting circularly polarized electromagnetic waves.
- this refinement is based on the refinement explained in relation to FIG. 4, for which reason reference is additionally made to the explanations relating to this.
- a detection circuit for circularly polarized electromagnetic waves which comprises an antenna unit 70 which has two antenna elements (not shown), a first of the two antenna elements serving to transmit or receive vertically polarized electromagnetic waves, whereas a second antenna element of the two antenna elements serves to transmit and / or receive horizontally polarized electromagnetic waves.
- the first antenna element is connected to a first communication line 72, which is via a signal splitter 76 is connected to the high frequency circuitry 50.
- the second of the antenna elements is connected to a power combiner 78 via a communication line 74. This is also connected to the signal divider 76.
- the power combiner 78 is thus available with a horizontal received power of a horizontal received signal part of the received signal and a vertical received power of a vertical received signal of the received signal. By combining them in the power combiner 78, a suitable superimposition of these powers can be realized.
- the power combiner 78 is also connected to a power measurement circuit 80 which measures the superimposed received power and transmits a corresponding value to the control unit 46.
- a value of the received power of the received signal is determined and can be used by the control unit 46 to set the attenuation circuit 44 such that the transmitted power is reduced depending on a value of the received power of the received signal.
- the setting is preferably selected so that in particular the communication connection between the transmitting / receiving device 56 and the ETC-OBU 28 can be implemented undisturbed.
- corresponding parameters or table values can be made available that allow a value for the transmission power to be determined depending on the value of the received power. In this way, the interference or disturbance problem can be reduced or even solved.
- the aforementioned components of the detection circuit can be at least partially integrated into the communication device 32, 34.
- the detection circuit can detect and evaluate the circularly polarized signal from the toll station 54.
- the antenna unit 70 has dual polarized passive antenna elements which allow sufficient polarization decoupling to be achieved. A relative bandwidth of 4 to 5% can be implemented for both the toll collection system 68 and the traffic networking system 10.
- the antenna unit 70 supports the linear vertical Polarization and the linear horizontal polarization.
- the received signal with respect to CV2X is received via the antenna element of the antenna unit 70, which is designed for vertical polarization. It is - as explained with reference to FIG. 4 - amplified and fed to the control unit 30 via the respective antenna line 36, 38.
- the CV2X signal provided by the control unit 30 is fed to the communication device 32, 34 via the antenna line 36, 38, amplified there in a suitable manner and transmitted via the antenna element of the antenna unit 70 provided for vertical polarization.
- a signal from the toll collection system 68 is received via both antenna elements of the antenna unit 70.
- a constructive superimposition of the horizontal received signal part and the vertical received signal part of the received signal can be achieved via the power combiner 78, which can be formed, for example, by a matching line. This is done in the correct phase.
- the power measurement circuit 80 determines the received power of the received signal, which in the present case is the circularly polarized signal of the transmitting / receiving device 56.
- the control unit 46 sets the attenuation circuit 44 as a function of the value of the received power. As a result, the transmission power is reduced depending on the reception of the received signal by the communication device if the received signal uses at least partially horizontally polarized electromagnetic waves.
- FIG. 11 shows, in a further schematic block diagram illustration like FIG. 10, a second embodiment which is based on the first embodiment according to FIG. 10 and according to FIG. 4, which is why only the differences from FIG. 10 are explained below.
- the second embodiment according to FIG. 11 has an adjustable phase shift circuit 82 in the detection circuit, the phase shift of which can be set by a control signal from the control unit 46.
- the phase shift circuit 82 is connected to the control unit 46.
- the phase shifter circuit 82 is looped into the communication line 74 between the antenna unit 70 and the power combiner 78.
- the phase of the horizontal received signal part of the received signal can be shifted as a function of a corresponding control signal from the control unit 46. This allows the horizontally polarized component of the ETC signal to be changed dynamically.
- the power combiner 78 As a result of constructive interference, a maximum value of the received power of the received signal can thus be detected by the power combiner 78 by means of the power measuring circuit 80. In the event of destructive interference, cancellation by the power combiner 78 can occur, so that the power measuring circuit 80 essentially does not measure any power. By adding the phase shift circuit 82, the overall robustness of the detection circuit can be further improved.
- FIG. 12 shows a further schematic block diagram illustration for a communication device according to a third embodiment, which is also based on the first embodiment according to FIG. 10, which is why reference is made to the explanations relating to FIG. 10 and also to FIG. 4 in this regard. Only the differences in relation to FIG. 11 are explained below.
- the detection circuit In contrast to the second embodiment according to FIG. 11, instead of the power combiner 78, the detection circuit according to the embodiment according to FIG .
- the first power measuring circuit 64 is connected to the signal divider 76 and measures a vertical received power of the vertical received signal part of the received signal.
- the second power measurement circuit 80 is connected to the phase shifter circuit 82 and measures a horizontal received power of the horizontal received signal portion of the received signal.
- the control unit 46 is designed to evaluate the powers determined by the power measuring circuits 64, 80 and to process them accordingly in order to determine therefrom whether and, if applicable, with what strength a circular polarized received signal of a toll collection system 68 is present. Depending on this, the damping circuit 44 can then be adjusted with regard to its damping.
- the invention is not limited thereto.
- the vertically polarized electromagnetic waves other linearly polarized electromagnetic waves can of course occur.
- electromagnetic waves which are orthogonally polarized to the linearly polarized electromagnetic waves can occur.
- these electromagnetic waves only need to be partially polarized orthogonally, such as, for example, in the case of circularly polarized electromagnetic waves or the like.
- the antenna unit can be designed accordingly.
- the antenna unit can have at least one first antenna element which is designed and / or aligned to be adapted to linearly polarized electromagnetic waves.
- the antenna unit can have at least one second antenna element which is designed and / or aligned orthogonally to be adapted to the first antenna element.
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Devices For Checking Fares Or Tickets At Control Points (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020117335.0A DE102020117335B4 (de) | 2020-07-01 | 2020-07-01 | Betreiben einer Kommunikationseinrichtung eines Kraftfahrzeugs |
| PCT/EP2021/063062 WO2022002476A1 (de) | 2020-07-01 | 2021-05-18 | Betreiben einer kommunikationseinrichtung eines kraftfahrzeugs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4176528A1 true EP4176528A1 (de) | 2023-05-10 |
Family
ID=76059881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21727114.7A Pending EP4176528A1 (de) | 2020-07-01 | 2021-05-18 | Betreiben einer kommunikationseinrichtung eines kraftfahrzeugs |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US12254722B2 (de) |
| EP (1) | EP4176528A1 (de) |
| CN (1) | CN115804162A (de) |
| DE (1) | DE102020117335B4 (de) |
| WO (1) | WO2022002476A1 (de) |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4944719B1 (de) | 1969-10-17 | 1974-11-29 | ||
| US8169311B1 (en) * | 1999-12-15 | 2012-05-01 | Automotive Technologies International, Inc. | Wireless transmission system for vehicular component control and monitoring |
| DE102004028390A1 (de) * | 2004-06-14 | 2006-02-02 | Deutsche Bahn Ag | Übertragung von Informationen innerhalb eines Fahrzeugverbandes unter Nutzung einer pneumatischen oder hydraulischen Leitung als Übertragungskanal |
| US20080317098A1 (en) * | 2005-12-22 | 2008-12-25 | Juntunen Juha O | Low Power Radio Device With Reduced Interference |
| DE102007029952B4 (de) | 2007-06-28 | 2022-09-22 | Bayerische Motoren Werke Aktiengesellschaft | Vorrichtung zur Informationsübertragung |
| JP4944719B2 (ja) | 2007-09-19 | 2012-06-06 | 小島プレス工業株式会社 | 車両用アンテナ装置 |
| US8254844B2 (en) | 2009-05-29 | 2012-08-28 | Motorola Solutions, Inc. | Method and apparatus for utilizing a transmission polarization to reduce interference with a primary incumbent signal |
| GB2485543B (en) * | 2010-11-17 | 2014-03-12 | Socowave Technologies Ltd | Mimo antenna calibration device,integrated circuit and method for compensating phase mismatch |
| US9692549B2 (en) | 2011-06-29 | 2017-06-27 | Spatial Digital Systems, Inc. | Accessing CP channels with LP terminals via wavefront multiplexing |
| CN102509901B (zh) * | 2011-11-16 | 2013-11-20 | 广州市埃特斯通讯设备有限公司 | 应用于etc系统的相控阵天线及其使用方法 |
| JP7029245B2 (ja) * | 2017-08-01 | 2022-03-03 | 日本放送協会 | 送信装置及び受信装置 |
| DE102017215864B3 (de) * | 2017-09-08 | 2019-03-07 | Audi Ag | Verfahren zum Regeln einer Sendeleistung für eine von einem Kraftfahrzeug ausgehende Funkverbindung, Regelvorrichtung für ein Kraftfahrzeug und Kraftfahrzeug mit Regelvorrichtung |
| US11496350B2 (en) * | 2018-03-27 | 2022-11-08 | University Of South Carolina | Dual-polarization FBMC in wireless communication systems |
| DE102018002661A1 (de) * | 2018-03-31 | 2019-10-02 | Heinz Lindenmeier | Antennen-Einrichtung für die bidirektionale Kommunikation auf Fahrzeugen |
| DE102018210178B3 (de) * | 2018-06-22 | 2019-08-22 | Audi Ag | Verfahren und Steuervorrichtung zum Steuern einer Sendeleistung einer Sendeantenne einer Funkanlage in einem Kraftfahrzeug sowie Kraftfahrzeug |
| JP7139188B2 (ja) * | 2018-08-21 | 2022-09-20 | 株式会社日立製作所 | 送信機 |
| US12451938B2 (en) * | 2020-03-05 | 2025-10-21 | Lg Electronics Inc. | Electronic device comprising antenna |
-
2020
- 2020-07-01 DE DE102020117335.0A patent/DE102020117335B4/de active Active
-
2021
- 2021-05-18 WO PCT/EP2021/063062 patent/WO2022002476A1/de not_active Ceased
- 2021-05-18 CN CN202180046516.8A patent/CN115804162A/zh active Pending
- 2021-05-18 US US18/004,011 patent/US12254722B2/en active Active
- 2021-05-18 EP EP21727114.7A patent/EP4176528A1/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN115804162A (zh) | 2023-03-14 |
| US12254722B2 (en) | 2025-03-18 |
| DE102020117335B4 (de) | 2022-01-13 |
| DE102020117335A1 (de) | 2022-01-05 |
| WO2022002476A1 (de) | 2022-01-06 |
| US20230260333A1 (en) | 2023-08-17 |
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