KR20210026253A - Method for preventing signal interference of vehicle supporting c-v2x communication and wave communication and vehicle-mounted device performing method - Google Patents

Abstract

An embodiment of the present invention relates to a vehicle-mounted device transmitting and receiving a signal using C-V2X communication and WAVE communication. The device includes: a first communication unit supporting the C-V2X communication; a second communication unit supporting the WAVE communication; and a processor controlling the first communication unit and the second communication unit. The processor determines whether beam formation needs to be set for reception antennas in the second communication unit so that interference attributable to a C-V2X signal from another vehicle is prevented, and applies beam formation information to the reception antennas based on the traveling directions of a vehicle equipped with the vehicle-mounted device and the other vehicle, the steering angles of the vehicles, and the antenna correction values of the vehicles.

Description

A method for preventing signal interference from a vehicle that supports C-V2X communication and WAVE communication, and a vehicle-mounted device using the method {METHOD FOR PREVENTING SIGNAL INTERFERENCE OF VEHICLE SUPPORTING C-V2X COMMUNICATION AND WAVE COMMUNICATION AND VEHICLE-MOUNTED DEVICE PERFORMING METHOD}

The present invention relates to a method for preventing signal interference in a vehicle supporting C-V2X communication and WAVE communication, and to a vehicle-mounted apparatus using the method.

As the supply rate of new roads decreases relative to the increase in demand for automobiles, traffic congestion occurs frequently, and traffic congestion causes environmental pollution, noise, consumption of automobile fuel consumption, and social losses due to congestion. In particular, as urban centers with dense populations increase, such traffic congestion has emerged as a social problem.

Accordingly, the Intelligent Transport System was developed based on the development of the transportation system using advanced technology to reduce social losses caused by traffic congestion and meet the national green growth strategy.

Intelligent transportation system refers to providing traffic information and services by incorporating advanced technology into various traffic facilities on the road, largely, on board equipment (OBE), roadside units (RSU), and intelligent traffic servers. It can be configured as, and information can be transmitted and received with each other through a WAVE (Wireless Access in Vehicle Environment) network. In this case, the roadside device will support WAVE communication of the vehicle-mounted device.

In addition, the intelligent transportation system can incorporate pre-established cellular communication to improve the connectivity of vehicle-mounted devices, and this is called a Cellular-Vehicle to Everything (C-V2X) network. In this case, the roadside device supports C-V2X communication and WAVE communication of the vehicle-mounted device.

Meanwhile, since WAVE communication is based on clear channel assessment (CCA)-based data transmission, when C-V2X communication and WAVE communication are simultaneously operated, the WAVE received signal may be interfered with due to the C-V2X signal. Therefore, in order to minimize signal interference, it is necessary to apply a beamforming technique to an antenna used for WAVE communication.

The problem to be solved by the present invention is to provide a method for preventing interference of a WAVE signal by a C-V2X signal when C-V2X communication and WAVE communication are simultaneously operated.

However, the problem to be solved by the present invention is not limited to those mentioned above, and another problem to be solved that is not mentioned can be clearly understood by those of ordinary skill in the art to which the present invention belongs from the following description. will be.

A vehicle-mounted device that transmits and receives signals using Cellular-Vehicle to Everything (C-V2X) communication and Wireless Access in Vehicle Environment (WAVE) communication according to an embodiment of the present invention is a device supporting the C-V2X communication. 1 communication department; A second communication unit supporting the WAVE communication; And a processor for controlling the first communication unit and the second communication unit, wherein the processor includes a beam to receive antennas included in the second communication unit to prevent interference by a C-V2X signal transmitted from another vehicle. It is determined whether it is necessary to set beamforming, and the driving direction of the vehicle on which the vehicle-mounted device is mounted and the other vehicle, a steering angle of the vehicle and the other vehicle, and an antenna correction value of the vehicle and the other vehicle are determined. Based on this, beamforming information may be applied to the reception antennas included in the second communication unit.

The processor determines whether the traveling direction of the other vehicle is the same as the traveling direction of the vehicle using vehicle driving information, and when the traveling direction of the other vehicle is the same as the traveling direction of the vehicle, the second communication unit It may be determined that it is necessary to set beamforming for the reception antennas included in the.

The processor may determine whether the other vehicle is running in front of the vehicle using vehicle operation information, and determine that it is necessary to set beamforming to reception antennas included in the second communication unit. .

The processor determines a distance between the other vehicle and the vehicle using vehicle operation information, and when the distance between the other vehicle and the vehicle is less than or equal to a threshold value, beamforming is performed on reception antennas included in the second communication unit. ) Can be determined to need to be set.

The processor adds the steering angle of the other vehicle and the vehicle to a value of the difference in the driving direction between vehicles calculated using information on the driving direction of the other vehicle and the information on the driving direction of the vehicle. The beamforming angles of the reception antennas included in the second communication unit may be calculated by adding the vehicle and the antenna correction value of the vehicle.

In another embodiment of the present invention, a method for preventing signal interference of a vehicle transmitting and receiving signals using Cellular-Vehicle to Everything (C-V2X) communication and Wireless Access in Vehicle Environment (WAVE) communication includes the C-V2X communication. Receiving a C-V2X signal from another vehicle by using; And receiving a WAVE signal from the other vehicle using the WAVE communication. Determining whether it is necessary to set beamforming to reception antennas receiving the WAVE signal in order to prevent interference by the C-V2X signal transmitted by the other vehicle; And setting beamforming information to receiving antennas receiving the WAVE signal based on a driving direction of the vehicle and the other vehicle, a steering angle of the vehicle and the other vehicle, and an antenna correction value of the vehicle and the other vehicle. It may include steps.

According to an embodiment of the present invention, when C-V2X communication and WAVE communication are simultaneously operated, the WAVE signal is received by applying beamforming to the WAVE receiving antenna, thereby minimizing the interference of the WAVE signal by the C-V2X signal Can receive signals.

1 is a block diagram of an intelligent transportation system including a base station device according to an embodiment of the present invention.
2 shows an antenna array in a vehicle that operates C-V2X communication and WAVE communication together.
3 shows a method of setting beamforming for a C-V2X communication antenna and a WAVE communication antenna.
4 illustrates a method of configuring beamforming for a C-V2X transmission antenna according to an embodiment of the present invention.
5 illustrates a method of determining whether a first vehicle is driving in front of a second vehicle according to an embodiment of the present invention.
6 shows a method of calculating a reception angle of a WAVE reception antenna according to an embodiment of the present invention.
7 is a flowchart illustrating a method of configuring beamforming for reception antennas that receive a WAVE signal according to an embodiment of the present invention.
8 is a block diagram showing a vehicle-mounted device performing an embodiment of the present invention.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments make the disclosure of the present invention complete, and the general knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to the possessor, and the invention is only defined by the scope of the claims.

In describing embodiments of the present invention, if it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in an embodiment of the present invention, which may vary according to the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout the present specification.

1 is a block diagram of an intelligent transportation system including a base station device according to an embodiment of the present invention.

1, the intelligent transportation system 100 includes an intelligent transportation server 110, a traffic database 120, a base station apparatus 130, a vehicle-mounted apparatus 140 mounted on the vehicle 30, and a roadside apparatus ( 150) and transportation infrastructure devices 160 and 170.

1 illustrates one base station device 130 and one roadside device 150, but is not limited thereto. That is, according to an embodiment, there may be a plurality of base station apparatuses 130 and/or roadside apparatuses 150.

The vehicle 30 may mount the vehicle-mounted device 140. The vehicle 30 may perform WAVE (Wireless Access in Vehicular Environments) communication and C-V2X communication with the intelligent traffic server 110 using the mounted vehicle-mounted device 140. That is, the vehicle 30 may mean a vehicle capable of WAVE communication and C-V2X communication.

The intelligent transportation system 100 operates a WAVE (Wireless Access in Vehicular Environments) network for direct communication between the vehicle-mounted devices 140 and direct communication between the vehicle-mounted device 140 and the roadside device 150, C-V2X (Cellular-Vehicle) for relay communication through the base station 130 between the vehicle-mounted devices 140 and the base station 130 between the vehicle-mounted device 140 and the vehicle communication support device 150 to Everything) network is operated with WAVE network.

In the intelligent transportation system 100 in which the C-V2X network and the WAVE network are operated together, only C-V2X communication is used for V2N (Vehicle to Network) communication 40 of the vehicle-mounted device 140 and the intelligent traffic server 110, or Both WAVE communication and C-V2X communication can be used, and V2V (Vehicle to Vehicle) communication 50 between the vehicle-mounted devices 140 or V2I between the vehicle-mounted device 140 and the vehicle communication support device 150 For the (Vehicle to Infrastructure) communication 60, WAVE communication or C-V2X communication may be used.

The intelligent traffic server 110 collects and processes traffic information collected from the vehicle-mounted device 140, the roadside device 150, and the traffic infrastructure devices 160 and 170 to provide a variety of information such as road congestion. Information data may be provided to the vehicle-mounted apparatus 140 through the base station apparatus 130, or may be provided to the vehicle-mounted apparatus 140 through the base station apparatus 130 and the roadside apparatus 150.

In the traffic database 120, traffic information collected by the intelligent traffic server 110 may be stored, or various information such as road congestion degree collected and processed by the intelligent traffic server 110 may be stored.

The base station device 130 is a component of a mobile communication service system including a mobile communication network 10 to which the intelligent traffic server 110 is connected, and includes a vehicle-mounted device 140 and a roadside unit located in the service area. Radio resources such as time and frequency for C-V2X communication may be allocated to the RSU) 150 and the transportation infrastructure devices 160 and 170.

The vehicle-mounted device 140 may be mounted on the vehicle 30 and may support C-V2X communication and WAVE communication. The vehicle-mounted device 140 may be a Telematics Control Unit (TCU). The vehicle-mounted device 140 collects traffic information of the vehicle 30 and transmits a message including the collected traffic information to the base station device 130. It may be transmitted to the intelligent traffic server 110 through the roadside device 150 and the base station device 130 through the intelligent traffic server 110. And, the vehicle-mounted device 140 is the intelligent traffic server 110 ), traffic information data including various information may be received through the base station device 130, or the traffic information data may be received through the base station device 130 and the roadside device 150, and the received traffic information data It can be expressed so that the occupant of the vehicle 30 can recognize it.

The roadside device 150 may serve as a repeater that relays communication between the base station device 130 and the vehicle-mounted device 140 and between the traffic infrastructure devices 160 and 170 and the vehicle-mounted device 140. . The roadside device 150 may collect traffic information collected by the vehicle-mounted device 140 through the V2I communication 60 and transmit it to the intelligent traffic server 110 according to the relay of the base station device 130. The roadside device 150 may receive traffic information data including various types of information from the intelligent traffic server 110 through the base station device 130 and provide it to the vehicle-mounted device 140 through the V2I communication 60. The roadside apparatus 150 partially converts the load of the V2N communication 40 between the vehicle-mounted apparatus 140 and the base station apparatus 130 into a load of the V2I communication 60 between the roadside apparatus 150 and the vehicle-mounted apparatus 140. Alternatively, the quality of service (QoS) of vehicle communication can be adjusted.

The traffic infrastructure devices 160 and 170 can communicate with the intelligent traffic server 110 through the relay of the base station device 130, and communicate with the vehicle-mounted device 140 through the relay of the roadside device 150. You can do it. For example, the traffic infrastructure devices 160 and 170 may be a traffic light controller or a camera-type road sensor, and may be connected to the roadside device 150 through a wired communication line.

2 shows an antenna array in a vehicle that operates C-V2X communication and WAVE communication together.

2(a) shows a front view and a side view of a vehicle 30 that operates C-V2X communication and WAVE communication together, and FIG. 2(b) is a vehicle that operates C-V2X communication and WAVE communication together ( 30) shows the top view.

Referring to FIG. 2A, the processors and antennas included in the on-vehicle device 140 are disposed apart by wire and may be connected by cables. WAVE communication antennas may be installed in front of the C-V2X communication antennas, but are not limited thereto. That is, according to an embodiment, in this specification, it is assumed that the WAVE communication antennas are installed in front of the C-V2X communication antennas, but it is applicable even when the C-V2X communication antennas are installed in front of the WAVE communication antennas. .

2B, when the WAVE communication antennas are installed in front of the C-V2X communication antennas, the WAVE received signal is the C-V2X transmission signal of the vehicle running in front of the vehicle 30 and its C- It may be interfered by the V2X transmission signal. On the other hand, since the WAVE communication antennas are relatively far away from the C-V2X communication antennas of the vehicle running behind the vehicle 30, interference by the C-V2X transmission signal of the vehicle running behind the vehicle 30 is Can be ignored.

3 shows a method of setting beamforming for a C-V2X communication antenna and a WAVE communication antenna.

Referring to FIG. 3, beamforming for a WAVE receiving antenna and beamforming for a C-V2X transmitting antenna may be set differently.

For example, the first vehicle 31 may set beamforming on its C-V2X transmission antenna in order to minimize an interference signal to its WAVE reception antenna. However, since there is no vehicle running in front of the first vehicle 31 and there is no interference signal by the C-V2X transmission antenna of the preceding vehicle, the first vehicle 31 does not set the beam formation on its own WAVE reception antenna. May not.

In addition, the second vehicle 33 may set beamforming on its C-V2X transmission antenna in order to minimize an interference signal to its own WAVE reception antenna. In addition, the second vehicle 33 may set beamforming to its own WAVE reception antenna in order to minimize an interference signal by the C-V2X transmission antenna of the first vehicle 31.

Finally, the third vehicle 35 may set the beamforming to its own C-V2X transmission antenna in order to minimize the interference signal to its own WAVE reception antenna. In addition, the third vehicle 35 may set beamforming to its own WAVE reception antenna in order to minimize an interference signal by the C-V2X transmission antenna of the second vehicle 33.

That is, referring to FIG. 3, since an interference signal can be generated in the WAVE reception antenna of the vehicle, the vehicle 30 must set the beam formation on the C-V2X transmission antenna. On the other hand, interference signals from the C-V2X transmission antenna of the preceding vehicle may exist only when there is a vehicle running in front. Therefore, when there is a vehicle running in front, the vehicle 30 must set the beam formation on its own WAVE reception antenna in order to minimize the interference signal by the C-V2X transmission antenna of the vehicle running in front.

Accordingly, a method of setting beamforming to a C-V2X transmission antenna and a method of setting beamforming to a WAVE receiving antenna will be described below.

Ⅰ. How to set up beamforming for C-V2X transmission antenna

The on-vehicle device 140 may minimize interference signals to the WAVE reception antenna generated by the C-V2X transmission signal of the own vehicle by setting beam formation to the C-V2X transmission antenna of the own vehicle.

4 illustrates a method of configuring beamforming for a C-V2X transmission antenna according to an embodiment of the present invention.

Referring to FIG. 4, the vehicle-mounted device 140 sets beam formation to the C-V2X transmission antenna installed in the vehicle 30 in order to minimize interference signals that may occur to the WAVE reception antenna of the vehicle 30. I can.

The power of the C-V2X transmission antenna used in C-ITS is 20dBm, and an interference signal having an average intensity of -20dBm may be radiated to the adjacent WAVE reception antenna. The interference signal of -20dBm intensity radiated from the C-V2X transmission antenna may be received with a maximum intensity of -62dBm in the WAVE reception antenna.

In the case of WAVE communication, since CCA-based data transmission and reception is performed, WAVE communication is not performed when the strength of an interference signal is -65dBm or more. Therefore, it is necessary to remove an interference signal of 3dBm.

In order to remove the interference signal, the vehicle-mounted device 140 receives a desired direction (angle) and a direction (angle) to be nulled when forming a beam for the C-V2X transmission antenna, and converts the received angles into the CGM ( Conjugate Gradient Method) algorithm. Through the CGM algorithm, the intensity of a signal at an angle to be radiated may be increased, and the intensity of a signal at an angle not to be radiated may be weakened. Accordingly, the on-vehicle device 140 may set the beamforming to the C-V2X transmission antenna by using the result of the CGM algorithm. Here, the CGM algorithm is a known algorithm that obtains a solution of a linear system having a symmetric positive-semidefinite matrix, and a detailed description thereof will be omitted herein.

The angle to be invalidated can be changed according to the installation location of the WAVE communication antenna and the C-V2X communication antenna. According to an embodiment, an angle to be invalidated may be an angle between a C-V2X transmission antenna and an intermediate point of two WAVE reception antennas. For example, the angle to be invalidated may be 0° (degree).

Ⅱ. How to set up beamforming for wave receiving antenna

The method of setting the beamforming for the WAVE receiving antenna consists of the following two steps. Below, among the vehicles 31, 33, and 55 shown in FIGS. 2 and 3, the second vehicle is reported as a vehicle for which beam formation is to be set (that is, a vehicle on which the vehicle-mounted device 140 of the present specification is mounted) , The first vehicle 31 and/or the third vehicle 35 will be described as a vehicle capable of emitting an interference signal to the second vehicle 33.

1. The step of determining whether beamforming setting is necessary for the WAVE receiving antenna

The on-vehicle device 140 may determine that it is necessary to set the beam formation to the WAVE receiving antenna when the vehicle running in the vicinity satisfies the following three conditions.

(1) Whether the traveling direction of the first vehicle and the traveling direction of the second vehicle are the same

The vehicle-mounted device 140 mounted on the second vehicle 33 uses the traveling direction information included in the Basic Safety Message (BSM) to emit an interference signal. It may be determined whether the traveling direction is the same as the traveling direction of the second vehicle 33. The basic safety message may include information on a latitude value, a longitude value, and a driving direction of the vehicle.

The moving direction information may be expressed in units of 0.0125° divided by 28800 by 360°. The moving direction information may be an integer greater than or equal to 0 and less than 28800. For example, when the field value of the traveling direction information is 7, it can be seen that the first vehicle 31 is traveling in a direction rotated eastward by 0.0875° (=7*0.0125°) around the positive north direction.

When the difference between the driving direction information n2 of the second vehicle 33 and the driving direction information n1 of the first vehicle 35 is greater than a predetermined threshold, the first vehicle 31 is a vehicle in the opposite lane. It can be judged as.

Here, only the first vehicle 31 has been described, but the description can be applied equally to the third vehicle 35.

(2) Whether the first vehicle is driving in front of the second vehicle

The on-vehicle device 140 may determine whether the first vehicle 31 is running in front of the second vehicle 33.

5 illustrates a method of determining whether a first vehicle is driving in front of a second vehicle according to an embodiment of the present invention.

5, the position of the first vehicle 31 is displayed on a two-dimensional coordinate using the latitude value and the longitude value of the second vehicle 33, and the second vehicle 33 through the basic safety message The position of the first vehicle 31 is displayed on two-dimensional coordinates by using the obtained latitude and longitude values of the first vehicle 31, and the second vehicle 33 obtained through the basic safety message 3 The location of the third vehicle 35 may be displayed on a two-dimensional coordinate using the latitude and longitude values of the vehicle 35.

As shown in FIG. 5, when the second vehicle 33 is positioned at (0,0) on the coordinates, the first vehicle is based on the relative position of the first vehicle 31 with respect to the second vehicle 33. 31 may be positioned on the coordinates, and the third vehicle 35 may be positioned on the coordinates according to the relative position of the third vehicle 35 with respect to the second vehicle 33.

As shown in FIG. 5, when the moving direction information of the second vehicle 33 is n2, the moving direction of the second vehicle 33 is indicated by a solid line in FIG. 5 according to the moving direction information of the second vehicle 33. As shown in FIG. 5, the boundary line may be displayed as shown in the dotted line in FIG. 5. In this case, the boundary line may mean a line that serves as a criterion for dividing whether the vehicle for which the location is to be known is running in front of the second vehicle 33 or behind the second vehicle 33.

According to the traveling direction information n2 of the second vehicle 33, the equation (f(x, y)) of a straight line with respect to the boundary line may be expressed as Equation 1 below.

When the longitude and latitude values of the second vehicle 33 are (x2, y2), and the longitude and latitude values of the first vehicle 31 are (x1, y1), f(x1+x2, y1) +y2) has a value greater than 0, and through this, it can be confirmed that the first vehicle 31 is located in the upper right direction on the coordinates than the second vehicle 33. Accordingly, it can be seen that the first vehicle 31 is driving in front of the second vehicle 33.

In the same way, when the longitude and latitude values of the third vehicle 35 are (x3, y3), f(x3+x2, y3+y2) has a value less than 0, through which the third vehicle It can be seen that reference numeral 35 is located in the lower left direction on the coordinates than the second vehicle 33. Accordingly, it can be seen that the third vehicle 35 is driving behind the second vehicle 33.

(3) Whether the distance between the first vehicle and the second vehicle is less than or equal to the threshold

The vehicle-mounted device 14 may determine whether the distance between the second vehicle 33 and the first vehicle 31 (or the third vehicle 35) is less than or equal to a threshold value.

The vehicle-mounted device 140 determines the distance between the second vehicle 33 and the first vehicle 31 and/or the distance between the second vehicle 33 and the third vehicle 35 using the Haversine formula. I can. The Haversine formula is a known formula for obtaining the distance between two coordinates on a sphere, and a detailed description thereof will be omitted in this specification.

2. Calculating the receiving angle of the WAVE receiving antenna

As described above, (1) the traveling direction of the first vehicle 31 is the same as the traveling direction of the second vehicle 33, and (2) the first vehicle 31 is traveling in front of the second vehicle 33 In the case where (3) the distance between the first vehicle and the second vehicle is less than or equal to the threshold, the on-vehicle device 140 may determine that it is necessary to set the beamforming to the WAVE receiving antenna.

When configuring the beamforming for the WAVE receiving antenna, you must determine the receiving angle of the WAVE receiving antenna. Hereinafter, a method of determining the reception angle of the WAVE reception antenna will be described.

6 shows a method of calculating a reception angle of a WAVE reception antenna according to an embodiment of the present invention.

Referring to FIG. 6, it is necessary to set the beamforming to the WAVE receiving antenna of the second vehicle 33 in preparation for an interference signal generated by the C-V2X transmission antenna of the first vehicle 31. In this case, the reception angle θ of the WAVE reception antenna may be determined using Equation 2 below.

Here, the reception angle θ of the WAVE reception antenna represents the incident angle of the C-V2X transmission signal transmitted by the first vehicle 31 with respect to the second vehicle 33, and n1 is the driving direction of the first vehicle 31 Is a value for information, n2 is a value for driving direction information of the second vehicle 33, ε1 represents the steering angle of the first vehicle 31, ε2 represents the steering angle of the second vehicle 33, and φ1 Denotes an antenna correction value of the first vehicle 31, and φ2 denotes an antenna correction value of the second vehicle 33.

Here, the antenna correction value may mean a value for correcting a difference between antennas due to the type of antenna, the position of the antenna in the vehicle, and the like.

The first vehicle 31 may periodically broadcast a basic safety message (eg, in 0.1 second increments). The basic safety message broadcast by the first vehicle 31 includes information on the steering angle and antenna correction value of the first vehicle 31 in addition to information on the latitude value, longitude value, and direction of travel of the first vehicle 31. Can include.

The vehicle-mounted device 140 mounted on the second vehicle 33 receives the basic safety message broadcast by the first vehicle 31 and uses the received basic safety message to determine the driving direction of the first vehicle 31. You can know the value for the information, the steering angle, and the antenna correction value.

The on-vehicle device 140 mounted on the second vehicle 33 may set the beam formation on the WAVE reception antenna at the reception angle of the WAVE reception antenna determined by using Equation (2).

7 is a flowchart illustrating a method of configuring beamforming for reception antennas that receive a WAVE signal according to an embodiment of the present invention.

Referring to FIG. 7, the in-vehicle device 140 mounted on the second vehicle 33 determines whether the traveling direction of the first vehicle 31 is the same as the traveling direction of the second vehicle 33 (S700 ), determine whether the first vehicle 31 is running in front of the second vehicle 33 (S710), and determine whether the distance between the first vehicle 31 and the second vehicle 33 is less than or equal to a threshold. Can be (S720).

In FIG. 7, for convenience of description, each determination is illustrated as being performed in the order of a traveling direction (S700), a driving sequence of vehicles (S710), and a distance between vehicles (S720), but is not limited thereto. That is, the determination of the traveling direction S700, the driving sequence S710 of the vehicle, and the inter-vehicle distance S720 may be made substantially simultaneously, but not simultaneously, but the order may be different from that of FIG. 7.

The traveling direction of the first vehicle 31 is the same as the traveling direction of the second vehicle 33, the first vehicle 31 is running in front of the second vehicle 33, and the first vehicle 31 and the second vehicle (33) When it is determined that the distance is less than or equal to the threshold, the on-vehicle device 140 stores beamforming information (e.g., the reception angle θ of the WAVE reception antenna determined using Equation 2 above) to the WAVE reception antenna. By applying the beam formation can be set (S730).

Conversely, if any one of steps S300, S310, and S320 is not true, the vehicle-mounted device 140 determines that there is no need to form a beam on the WAVE reception antenna, and forms a beam on the WAVE reception antenna. May not be set (S740).

8 is a block diagram showing a vehicle-mounted device performing an embodiment of the present invention.

Referring to FIG. 8, the on-vehicle device 140 may include a processor 141, a memory 143, and a transceiver 145.

The processor 141 may control the memory 143 and the transceiver 145 to perform functions, processes, and/or methods proposed in the present invention. The memory 143 is connected to the processor 141 and may store various types of information for driving the processor 141. The transceiver 145 is connected to the processor 141 and may transmit and/or receive a signal. The transceiver 145 may include a V2X modem capable of V2X communication and a cellular modem capable of general cellular communication.

In more detail, the processor 141 determines whether the vehicle-mounted device 140 mounted on the second vehicle 33 is the same as the travel direction of the first vehicle 31 and the second vehicle 33. , It is possible to determine whether the first vehicle 31 is running in front of the second vehicle 33 and determine whether the distance between the first vehicle 31 and the second vehicle 33 is less than or equal to a threshold value.

In the processor 141, the first vehicle 31 is traveling in the same direction as the second vehicle 33, the first vehicle 31 is running in front of the second vehicle 33, and the first vehicle 31 ) And the second vehicle 33 is determined to be less than or equal to the threshold, the vehicle-mounted device 140 transmits beamforming information to the WAVE reception antenna (eg, the reception angle of the WAVE reception antenna determined using Equation 2 above). Beam formation can be set by applying (θ).

The transceiver 145 may include a first communication unit 147 supporting C-V2X communication and a second communication unit 149 supporting WAVE communication. According to an embodiment, the first communication unit 147 includes two transmission antennas and two reception antennas for C-V2X communication, and the second communication unit 149 includes one transmission antenna for WAVE communication and It may include two receiving antennas.

The first communication unit 147 and the second communication unit 149 may be activated at the same time, and thus, the vehicle-mounted device 140 may simultaneously transmit and receive a C-V2X signal and a WAVE signal.

Combinations of each block of the block diagram attached to the present invention and each step of the flowchart may be performed by computer program instructions. Since these computer program instructions can be mounted on the encoding processor of a general-purpose computer, special purpose computer or other programmable data processing equipment, the instructions executed by the encoding processor of the computer or other programmable data processing equipment are each block of the block diagram or Each step in the flow chart will create a means to perform the functions described. These computer program instructions can also be stored in computer-usable or computer-readable memory that can be directed to a computer or other programmable data processing equipment to implement a function in a particular way, so that the computer-usable or computer-readable memory. It is also possible to produce an article of manufacture in which the instructions stored in the block diagram contain instruction means for performing the functions described in each block of the block diagram or each step of the flowchart. Since computer program instructions can also be mounted on a computer or other programmable data processing equipment, a series of operating steps are performed on a computer or other programmable data processing equipment to create a computer-executable process to create a computer or other programmable data processing equipment. It is also possible for the instructions to perform the processing equipment to provide steps for executing the functions described in each block of the block diagram and each step of the flowchart.

In addition, each block or each step may represent a module, segment, or part of code that contains one or more executable instructions for executing the specified logical function(s). In addition, it should be noted that in some alternative embodiments, functions mentioned in blocks or steps may occur out of order. For example, two blocks or steps shown in succession may in fact be performed substantially simultaneously, or the blocks or steps may sometimes be performed in the reverse order depending on the corresponding function.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential quality of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100: intelligent transportation system
110: intelligent traffic server
120: traffic database
130: base station device
140: vehicle-mounted device
150: roadside device
160, 170: transportation infrastructure devices

Claims (12)

In a vehicle-mounted device that transmits and receives signals using C-V2X (Cellular-Vehicle to Everything) communication and WAVE (Wireless Access in Vehicle Environment) communication,
A first communication unit supporting the C-V2X communication;
A second communication unit supporting the WAVE communication; And
Including a processor for controlling the first communication unit and the second communication unit,
The processor,
It is determined whether it is necessary to set beamforming to the reception antennas included in the second communication unit in order to prevent interference by the C-V2X signal transmitted by another vehicle,
Based on a driving direction of the vehicle on which the vehicle-mounted device is mounted and the other vehicle, a steering angle of the vehicle and the other vehicle, and an antenna correction value of the vehicle and the other vehicle, the receiving antennas included in the second communication unit Applying beamforming information
Vehicle-mounted device. The method of claim 1,
The processor,
Determine whether the traveling direction of the other vehicle is the same as the traveling direction of the vehicle using vehicle driving information,
When the traveling direction of the other vehicle is the same as the traveling direction of the vehicle, determining that it is necessary to set beamforming to the reception antennas included in the second communication unit.
Vehicle-mounted device. The method of claim 1,
The processor,
Determine whether the other vehicle is running in front of the vehicle using vehicle operation information,
Determining that it is necessary to set beamforming to the reception antennas included in the second communication unit
Vehicle-mounted device. The method of claim 1,
The processor,
Determine a distance between the other vehicle and the vehicle using vehicle operation information,
When the distance between the other vehicle and the vehicle is less than or equal to a threshold, determining that it is necessary to set beamforming to the reception antennas included in the second communication unit.
Vehicle-mounted device. The method of claim 1,
The processor,
The other vehicle and the vehicle after summing the steering angle of the other vehicle and the vehicle to a value of the driving direction difference between vehicles calculated using information on the driving direction of the other vehicle and the information on the driving direction of the vehicle Computing the beamforming angles of the reception antennas included in the second communication unit by adding the antenna correction value of
Vehicle-mounted device. In the method of preventing signal interference of a vehicle transmitting and receiving signals using C-V2X (Cellular-Vehicle to Everything) communication and WAVE (Wireless Access in Vehicle Environment) communication,
Receiving a C-V2X signal from another vehicle using the C-V2X communication; And
Receiving a WAVE signal from the other vehicle using the WAVE communication;
Determining whether it is necessary to set beamforming to reception antennas receiving the WAVE signal in order to prevent interference by the C-V2X signal transmitted by the other vehicle; And
Setting beamforming information to receiving antennas for receiving the WAVE signal based on a driving direction of the vehicle and the other vehicle, a steering angle of the vehicle and the other vehicle, and an antenna correction value of the vehicle and the other vehicle. Including
How to avoid signal interference in vehicles. The method of claim 6,
The determining step,
Determining whether the traveling direction of the other vehicle is the same as the traveling direction of the vehicle using vehicle driving information; And
If the traveling direction of the other vehicle is the same as the traveling direction of the vehicle, determining that it is necessary to set beamforming to the reception antennas included in the second communication unit.
How to avoid signal interference in vehicles. The method of claim 6,
The determining step,
Determining whether the other vehicle is driving in front of the vehicle using vehicle driving information; And
When the other vehicle is running in front of the vehicle, determining that it is necessary to set beamforming to the reception antennas included in the second communication unit.
How to avoid signal interference in vehicles. The method of claim 6,
The determining step,
Determining a distance between the other vehicle and the vehicle using vehicle driving information; And
When the distance between the other vehicle and the vehicle is less than or equal to a threshold, determining that it is necessary to set beamforming to the reception antennas included in the second communication unit.
How to avoid signal interference in vehicles. The method of claim 6,
The step of setting the beamforming information,
The other vehicle and the vehicle after summing the steering angle of the other vehicle and the vehicle to a value of the driving direction difference between vehicles calculated using information on the driving direction of the other vehicle and the information on the driving direction of the vehicle To calculate the beamforming angle of the receiving antennas receiving the WAVE signal by adding the antenna correction value of
How to avoid signal interference in vehicles. As a computer-readable recording medium storing a computer program,
The computer program,
A method comprising instructions for causing a processor to perform a method according to any one of claims 6 to 10.
Computer-readable recording medium. As a computer program stored in a computer-readable recording medium,
The computer program,
A method comprising instructions for causing a processor to perform a method according to any one of claims 6 to 10.
Computer program.

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