KR102656900B1 - Method for preventing signal interference of vehicle supporting c-v2x communication and wave communication and vehicle-mounted device performing method - Google Patents

Abstract

A vehicle-mounted device that transmits and receives signals using C-V2X communication and WAVE communication according to an embodiment of the present invention includes a first communication unit supporting the C-V2X communication; a second communication unit supporting the WAVE communication; and a processor that controls the first communication unit and the second communication unit, wherein the processor transmits a beam to the receiving antennas included in the second communication unit to prevent interference by C-V2X signals transmitted by other vehicles. Determine whether it is necessary to set the configuration, based on the driving direction of the vehicle equipped with the vehicle-mounted device and the other vehicle, the steering angle of the vehicle and the other vehicle, and the antenna correction value of the vehicle and the other vehicle, Beamforming information can be applied to the receiving antennas included in the second communication unit.

Description

Method for preventing signal interference in vehicles supporting C-V2X communication and WAVE communication, and 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 a vehicle-mounted device using the method.

As the supply rate of new roads decreases relative to the increase in automobile demand, traffic congestion occurs frequently, and traffic congestion causes environmental pollution, noise, automobile fuel consumption, and social losses due to congestion. In particular, as densely populated urban centers increase, traffic congestion is emerging as a social problem.

Accordingly, the Intelligent Transport System was developed based on the development of a transport system using cutting-edge technology to reduce social losses due to traffic congestion and to meet the national green growth strategy.

The intelligent transportation system refers to providing traffic information and services by applying cutting-edge technology to various traffic facilities on the road. It mainly includes On Board Equipment (OBE), Road Side Unit (RSU), and Intelligent Traffic Server. It can be composed of, and information can be transmitted and received between them through the WAVE (Wireless Access in Vehicle Environment) network. In this case, the roadside device supports WAVE communication of the vehicle-mounted device.

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

Meanwhile, since WAVE communication transmits data based on CCA (Clear Channel Assessment), when C-V2X communication and WAVE communication are operated simultaneously, the WAVE reception signal may be interfered with by the C-V2X signal. Therefore, it is necessary to apply beamforming technology to the antenna used in WAVE communication in order to minimize signal interference.

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

However, the problems to be solved by the present invention are not limited to those mentioned above, and other problems to be solved that are not mentioned can be clearly understood by those skilled in the art to which the present invention pertains from the description below. will be.

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 according to an embodiment of the present invention is a device that supports the C-V2X communication. 1 Department of Communications; a second communication unit supporting the WAVE communication; and a processor that controls the first communication unit and the second communication unit, wherein the processor transmits a beam to the receiving antennas included in the second communication unit to prevent interference by C-V2X signals transmitted by other vehicles. Determine whether it is necessary to set beamforming, and determine the driving direction of the vehicle equipped with the vehicle-mounted device and the other vehicle, the steering angle of the vehicle and the other vehicle, and the antenna correction value of the vehicle and the other vehicle. Based on this, beamforming information can be applied to the receiving antennas included in the second communication unit.

The processor uses vehicle operation information to determine whether the direction of travel of the other vehicle is the same as the direction of travel of the vehicle, and when the direction of travel of the other vehicle is the same as the direction of travel of the vehicle, the second communication unit It may be determined that beamforming needs to be set up for the receiving antennas included in .

The processor may use vehicle operation information to determine whether another vehicle is driving ahead of the vehicle and determine that beamforming needs to be set to the receiving antennas included in the second communication unit. .

The processor determines the distance between the vehicle and the other vehicle using vehicle operation information, and when the distance between the vehicle and the other vehicle is less than a threshold, beamforming is performed on the receiving antennas included in the second communication unit. ) may be judged necessary to set.

The processor adds the steering angles of the other vehicle and the vehicle to a value for the difference in driving direction between vehicles calculated using the information about the driving direction of the other vehicle and the information about the driving direction of the vehicle, and then adds the steering angle of the other vehicle and the other vehicle. The beam forming angles of the receiving antennas included in the second communication unit can be calculated by adding the antenna correction values of the vehicle and the vehicle.

A method of preventing signal interference in a vehicle that transmits and receives signals using C-V2X (Cellular-Vehicle to Everything) communication and WAVE (Wireless Access in Vehicle Environment) communication according to another embodiment of the present invention includes the C-V2X communication. Receiving a C-V2X signal from another vehicle using; and receiving a WAVE signal from the other vehicle using the WAVE communication; Determining whether it is necessary to set up beamforming on receiving antennas that receive the WAVE signal to prevent interference by the C-V2X signal transmitted by the other vehicle; and setting beamforming information in receiving antennas that receive the WAVE signal based on the driving direction of the vehicle and the other vehicle, the steering angle of the vehicle and the other vehicle, and the antenna correction value of the vehicle and the other vehicle. May include steps.

According to an embodiment of the present invention, when C-V2X communication and WAVE communication are operated simultaneously, beam forming is applied to the WAVE reception antenna to receive the WAVE signal, thereby minimizing interference of the WAVE signal by the C-V2X signal A signal can be received.

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

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. The present embodiments are merely provided to ensure that the disclosure of the present invention is complete and to provide common knowledge in the technical field to which the present invention pertains. It is provided to fully inform those who have the scope of the invention, and the present 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 gist of the present invention, the detailed description will be omitted. The terms described below are terms defined in consideration of functions in embodiments of the present invention, and may vary depending on the intention or custom of the user or operator. Therefore, the definition should be made based on the contents throughout this specification.

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

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

Although FIG. 1 shows one base station device 130 and one roadside device 150, the present invention is not limited thereto. That is, depending on the embodiment, there may be a plurality of base station devices 130 and/or roadside devices 150.

The vehicle 30 may be equipped with a vehicle-mounted device 140. The vehicle 30 can perform WAVE (Wireless Access in Vehicular Environments) communication and C-V2X communication with the intelligent transportation server 110 using the vehicle-mounted device 140. In other words, 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 vehicle-mounted devices 140 and between vehicle-mounted devices 140 and roadside devices 150, C-V2X (Cellular-Vehicle) for relay communication between vehicle-mounted devices 140 through the base station 130 and relay communication between vehicle-mounted devices 140 and vehicle communication support devices 150 through the base station 130. to Everything) network is operated together with the 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 between the vehicle-mounted device 140 and the intelligent transportation server 110. Both WAVE communication and C-V2X communication can be used, and V2V (Vehicle to Vehicle) communication 50 between vehicle mounted devices 140 or V2I between vehicle mounted devices 140 and vehicle communication support device 150 (Vehicle to Infrastructure) communication 60 may use WAVE communication or C-V2X communication.

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

The traffic database 120 may store traffic information collected by the intelligent transportation server 110 or various information such as road congestion collected and processed by the intelligent transportation server 110.

The base station device 130 is a component of a mobile communication service system including a mobile communication network 10 to which the intelligent transportation server 110 is connected, and includes a vehicle-mounted device 140 and a roadside unit located within the service area. Radio resources such as time and frequency for C-V2X communication can be allocated to the RSU (150) and transportation infrastructure devices (160, 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 sends a message containing the collected traffic information to the base station device 130. It can be transmitted to the intelligent transportation server 110 through, or transmitted to the intelligent transportation server 110 through the roadside device 150 and the base station device 130. And, the vehicle-mounted device 140 is connected to the intelligent transportation server 110. ), traffic information data containing various information can be received through the base station device 130, or the traffic information data can be received through the base station device 130 and the roadside device 150, and the received traffic information data It can be displayed so that the occupants 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 transportation 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 V2I communication 60 and transmit it to the intelligent transportation server 110 according to the relay of the base station device 130. The roadside device 150 may receive traffic information data including various information from the intelligent transportation server 110 through the base station device 130 and provide it to the vehicle-mounted device 140 through V2I communication 60. The roadside device 150 divides the load of V2N communication 40 between the vehicle-mounted device 140 and the base station device 130 into the load of V2I communication 60 between the roadside device 150 and the vehicle-mounted device 140. Alternatively, the QoS (Quality of Service) of vehicle communication can be adjusted.

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

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

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

Referring to (a) of FIG. 2, the processor and antennas included in the vehicle-mounted device 140 may be placed apart from each other by wire and connected by a cable. Antennas for WAVE communication may be installed ahead of antennas for C-V2X communication, but are not limited to this. That is, depending on the embodiment, this specification is described assuming that the WAVE communication antennas are installed in front of the C-V2X communication antennas, but it can also be applied when the C-V2X communication antennas are installed in front of the WAVE communication antennas. .

Referring to (b) of FIG. 2, when the WAVE communication antennas are installed in front of the C-V2X communication antennas, the WAVE reception signal is the C-V2X transmission signal of the vehicle running in front of the vehicle 30 and its C-V2X transmission signal. There may be interference by V2X transmission signals. 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 caused by the C-V2X transmission signal of the vehicle running behind the vehicle 30 is It can be ignored.

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

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

For example, the first vehicle 31 may set beamforming on its C-V2X transmission antenna to minimize interference signals 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 from the C-V2X transmitting antenna of the preceding vehicle, the first vehicle 31 does not set beamforming to its WAVE receiving antenna. It may not be possible.

Additionally, the second vehicle 33 may set beamforming on its C-V2X transmission antenna to minimize interference signals to its WAVE reception antenna. Additionally, the second vehicle 33 may set beamforming on its WAVE reception antenna to minimize interference signals caused by the C-V2X transmission antenna of the first vehicle 31.

Finally, the third vehicle 35 can set up beamforming on its C-V2X transmit antenna to minimize interference signals to its WAVE receive antenna. Additionally, the third vehicle 35 may set beamforming on its WAVE reception antenna to minimize interference signals caused by the C-V2X transmission antenna of the second vehicle 33.

That is, referring to FIG. 3, since interference signals may be generated in the WAVE reception antenna of the vehicle, the vehicle 30 must set beamforming to 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 driving in front. Therefore, if there is a vehicle driving in front, the vehicle 30 must set beamforming to its WAVE receiving antenna to minimize interference signals caused by the C-V2X transmitting antenna of the vehicle driving in front.

Therefore, below we will look at how to set up beamforming on the C-V2X transmit antenna and how to set up beamforming on the WAVE receive antenna.

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

The vehicle-mounted device 140 can set beamforming to the C-V2X transmission antenna of the vehicle to minimize interference signals to the WAVE reception antenna generated by the C-V2X transmission signal of the vehicle.

Figure 4 shows a method for setting beamforming in a C-V2X transmission antenna according to an embodiment of the present invention.

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

The power of the C-V2X transmitting antenna used in C-ITS is 20dBm, and an interference signal with an average strength of -20dBm can be radiated to adjacent WAVE receiving antennas. An interference signal with a strength of -20dBm radiated from the C-V2X transmitting antenna can be received with a strength of up to -62dBm from the WAVE receiving antenna.

In the case of WAVE communication, data transmission and reception is based on CCA, so if the strength of the interference signal is more than -65dBm, WAVE communication does not occur. Therefore, it is necessary to remove interference signals of as much as 3dBm.

To remove interference signals, the vehicle-mounted device 140 receives the desired direction (angle) and the direction (angle) to be nulled when forming a beam for the C-V2X transmission antenna, and uses the input angles as CGM (CGM). It can be processed using the Conjugate Gradient Method algorithm. Through the CGM algorithm, the intensity of the signal at an angle to be radiated can be increased, and the intensity of the signal at an angle not to be radiated can be weakened. Accordingly, the vehicle-mounted device 140 can set beamforming to the C-V2X transmission antenna using the result of the CGM algorithm. Here, the CGM algorithm is a known algorithm for finding a solution to a linear system with a symmetric positive-semidefinite matrix, and detailed description will be omitted in this specification.

The angle to be nullified may change depending on the installation location of the WAVE communication antenna and the C-V2X communication antenna. Depending on the embodiment, the angle to be nullified may be the angle between the midpoint of the C-V2X transmitting antenna and the two WAVE receiving antennas. For example, the angle to be nullified may be 0° (degree).

Ⅱ. How to set up beamforming for WAVE receiving antenna

Setting up beamforming for a WAVE receiving antenna consists of the following two steps. Below, the second vehicle among the vehicles 31, 33, and 55 shown in FIGS. 2 and 3 will be viewed as a vehicle for which beam forming is to be set (i.e., a vehicle equipped with the vehicle-mounted device 140 of the present specification). , the first vehicle 31 and/or the third vehicle 35 will be described as vehicles that may radiate interference signals to the second vehicle 33.

1. Determining whether beamforming settings are necessary for the WAVE receiving antenna

The vehicle-mounted device 140 may determine that it is necessary to set beamforming at the WAVE reception antenna when a vehicle running nearby satisfies the three conditions below.

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

The vehicle-mounted device 140 mounted on the second vehicle 33 uses the heading information included in the Basic Safety Message (BSM) to detect the possibility of radiating an interference signal from the first vehicle 31. 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 about the latitude value, longitude value, and traveling direction of the vehicle.

The heading information can be expressed in units of 0.0125°, which is 360° divided by 28800. The direction information may be an integer between 0 and 28800. For example, if the field value of the 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 true north direction.

If the difference between the direction information n2 of the second vehicle 33 and the 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 that.

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

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

The vehicle-mounted device 140 may determine whether the first vehicle 31 is driving ahead of the second vehicle 33.

Figure 5 shows a method of determining whether a first vehicle is driving ahead of a second vehicle according to an embodiment of the present invention.

Referring to FIG. 5, the location of the first vehicle 31 is displayed on two-dimensional coordinates using the latitude and longitude values of the second vehicle 33, and the second vehicle 33 is displayed through the basic safety message. Using the obtained latitude and longitude values of the first vehicle 31, the location of the first vehicle 31 is displayed on two-dimensional coordinates, and the second vehicle 33 obtains the second vehicle 33 through the basic safety message. The location of the third vehicle 35 can be displayed on two-dimensional coordinates using the latitude and longitude values of the third vehicle 35.

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

As shown in FIG. 5, when the traveling direction information of the second vehicle 33 is n2, the traveling direction of the second vehicle 33 is indicated by the solid line in FIG. 5 according to the traveling direction information of the second vehicle 33. It can be displayed as follows, and the boundary line can be displayed as a dotted line in FIG. 5. At this time, the boundary line may mean a line that serves as a standard for dividing whether the vehicle whose location you want to know is traveling 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 straight line equation (f(x, y)) for the boundary line can 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 to the right and upward on the coordinates compared to the second vehicle 33. Accordingly, it can be seen that the first vehicle 31 is driving ahead of the second vehicle 33.

In the same way, when the longitude value and latitude value of the third vehicle 35 are (x3, y3), f(x3+x2, y3+y2) has a value less than 0, and through this, the third vehicle 35 It can be confirmed that (35) is located to the lower left 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 below 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.

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. You can. The Haversine formula is a known formula for calculating the distance between two coordinates on a sphere, and detailed description will be omitted in this specification.

2. Calculating the reception 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 runs ahead of the second vehicle 33. (3) If the distance between the first vehicle and the second vehicle is less than or equal to the threshold, the vehicle-mounted device 140 may determine that beamforming needs to be set to the WAVE reception antenna.

When setting up beamforming on a WAVE receiving antenna, the reception angle of the WAVE receiving antenna must be determined. Below, we will explain how to determine the reception angle of the WAVE reception antenna.

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

Referring to FIG. 6, it is necessary to set beamforming at the WAVE reception antenna of the second vehicle 33 in preparation for the interference signal generated from the C-V2X transmission antenna of the first vehicle 31. At this time, the reception angle (θ) of the WAVE reception antenna can be determined using Equation 2 below.

Here, the reception angle (θ) of the WAVE reception antenna represents the angle of incidence of the C-V2X transmission signal transmitted by the first vehicle 31 with respect to the second vehicle 33, and n1 represents 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 may represent the antenna correction value of the first vehicle 31, and ϕ2 may represent the antenna correction value of the second vehicle 33.

Here, the antenna correction value may mean a value for correcting differences between antennas due to the type of antenna, the location of the antenna in the vehicle, etc.

The first vehicle 31 may broadcast a basic safety message periodically (eg, every 0.1 seconds). The basic safety message broadcast by the first vehicle 31 includes information about the steering angle and antenna correction value of the first vehicle 31 in addition to information about the latitude value, longitude value, and heading direction of the first vehicle 31. It can be included.

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 find the information value, steering angle, and antenna correction value.

The vehicle-mounted device 140 mounted on the second vehicle 33 can set beam forming at the WAVE reception antenna at the reception angle of the WAVE reception antenna determined using Equation 2.

Figure 7 is a flowchart showing a method for setting beamforming in receiving antennas that receive WAVE signals according to an embodiment of the present invention.

Referring to FIG. 7, the vehicle-mounted 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 driving in front of the second vehicle 33 (S710), and determine whether the distance between the first vehicle 31 and the second vehicle 33 is below the threshold. (S720).

In FIG. 7 , for convenience of explanation, each determination is shown as if it is performed in the order of the direction of travel (S700), the driving order of vehicles (S710), and the distance between vehicles (S720), but the judgment is not limited thereto. That is, the determination of the direction of travel (S700), the order of vehicle operation (S710), and the distance between vehicles (S720) may be made substantially at the same time, or may not be made simultaneously, but the order may be different from that in 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 traveling in front of the second vehicle 33, and the first vehicle 31 and the second vehicle When it is determined that the distance between (33) is below the threshold, the vehicle-mounted device 140 sends beamforming information (e.g., the reception angle (θ) of the WAVE reception antenna determined using Equation 2 above) to the WAVE reception antenna. Beam forming can be set by applying (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 perform beamforming on the WAVE receiving antenna, and forms beam on the WAVE receiving antenna. may not be set (S740).

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

Referring to FIG. 8 , the vehicle-mounted 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 the functions, processes, and/or methods proposed in the present invention. The memory 143 is connected to the processor 141 and can store various information for driving the processor 141. The transceiver 145 is connected to the processor 141 and can transmit and/or receive signals. 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 determines whether the traveling direction of the first vehicle 31 is the same as the traveling direction of the second vehicle 33. , it is possible to determine whether the first vehicle 31 is driving in front of the second vehicle 33 and whether the distance between the first vehicle 31 and the second vehicle 33 is less than or equal to a threshold value.

The processor 141 determines that 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 traveling in front of the second vehicle 33, and the first vehicle 31 is running in front of the second vehicle 33. ) When it is determined that the distance between the second vehicle 33 is below the threshold, the vehicle-mounted device 140 provides beamforming information to the WAVE receiving antenna (e.g., the reception angle of the WAVE receiving antenna determined using Equation 2 above) Beam forming 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. Depending on the embodiment, the first communication unit 147 includes two transmitting antennas and two receiving antennas for C-V2X communication, and the second communication unit 149 includes one transmitting antenna and two receiving antennas for WAVE communication. It may include two receiving antennas.

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

Combinations of each block of the block diagram and each step of the flow diagram attached to the present invention 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 performed through the encoding processor of the computer or other programmable data processing equipment are included in each block or block of the block diagram. Each step of the flowchart creates a means to perform the functions described. These computer program instructions may 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 The instructions stored in can also produce manufactured items containing instruction means that perform the functions described in each block of the block diagram or each step of the flow diagram. Computer program instructions can also be mounted on a computer or other programmable data processing equipment, so that a series of operational steps are performed on the computer or other programmable data processing equipment to create a process that is executed by the computer, thereby generating a process that is executed by the computer or other programmable data processing equipment. Instructions that perform processing equipment may also provide steps for executing functions described in each block of the block diagram and each step of the flow diagram.

Additionally, each block or each step may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s). Additionally, it should be noted that in some alternative embodiments it is possible for the functions mentioned in the blocks or steps to 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 reverse order depending on the corresponding function.

The above description is merely an exemplary explanation of the technical idea of the present invention, and those skilled in the art 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 rather to explain it, 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 shall be interpreted in accordance with the claims below, and all technical ideas within the scope equivalent thereto shall be construed as being included in the scope of rights of the present invention.

100: Intelligent transportation system
110: Intelligent traffic server
120: Traffic database
130: base station device
140: Vehicle mounted device
150: Fireside 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
Comprising a processor that controls the first communication unit and the second communication unit,
The processor,
Determine whether it is necessary to set beamforming on the receiving antennas included in the second communication unit to prevent interference by C-V2X signals transmitted by other vehicles,
Calculate a beam forming angle based on the difference in driving direction between the vehicle equipped with the vehicle-mounted device and the other vehicle, the steering angle of the vehicle and the other vehicle, and the antenna correction value of the vehicle and the other vehicle,
Applying beamforming information including the beamforming angle to the receiving antennas included in the second communication unit.
Vehicle-mounted device. According to claim 1,
The processor,
Using vehicle operation information, determine whether the direction of travel of the other vehicle is the same as the direction of travel of the vehicle,
When the direction of travel of the other vehicle is the same as the direction of travel of the vehicle, determining that it is necessary to set beamforming to the receiving antennas included in the second communication unit
Vehicle-mounted device. According to claim 1,
The processor,
Using vehicle operation information, determine whether another vehicle is driving in front of the vehicle,
Determining that it is necessary to set up beamforming for the receiving antennas included in the second communication unit
Vehicle-mounted device. According to claim 1,
The processor,
Determine the distance between the vehicle and the other 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 beamforming needs to be set up in the receiving antennas included in the second communication unit.
Vehicle-mounted device. According to claim 1,
The processor,
The steering angles of the other vehicle and the vehicle are added to the value of the difference in driving direction between vehicles calculated using the information about the driving direction of the other vehicle and the information about the driving direction of the vehicle, and then the other vehicle and the vehicle Calculate the beam forming angle of the receiving antennas included in the second communication unit by adding the antenna correction values of
Vehicle-mounted device. In a method of preventing signal interference in a vehicle that transmits and receives 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 up beamforming on receiving antennas that receive the WAVE signal to prevent interference by the C-V2X signal transmitted by the other vehicle; and
calculating a beam forming angle based on the difference in driving direction between the vehicle and the other vehicle, the steering angle of the vehicle and the other vehicle, and the antenna correction value of the vehicle and the other vehicle; and
Comprising the step of setting beamforming information including the beamforming angle to receiving antennas that receive the WAVE signal.
How to prevent signal interference in your vehicle. According to clause 6,
The determining step is,
determining whether the direction of travel of the other vehicle is the same as the direction of travel of the vehicle using vehicle operation information; and
When the direction of travel of the other vehicle is the same as the direction of travel of the vehicle, determining that beamforming needs to be set up in the receiving antennas.
How to prevent signal interference in your vehicle. According to clause 6,
The determining step is,
determining whether another vehicle is traveling ahead of the vehicle using vehicle operation information; and
If the other vehicle is traveling ahead of the vehicle, determining that beamforming needs to be set up on the receiving antennas.
How to prevent signal interference in your vehicle. According to clause 6,
The determining step is,
determining a distance between the vehicle and another vehicle using vehicle operation information; and
If the distance between the vehicle and the other vehicle is below a threshold, determining that beamforming needs to be set up on the receiving antennas.
How to prevent signal interference in your vehicle. According to clause 6,
The step of setting the beamforming information is,
The steering angles of the other vehicle and the vehicle are added to the value of the difference in driving direction between vehicles calculated using the information about the driving direction of the other vehicle and the information about the driving direction of the vehicle, and then the other vehicle and the vehicle Calculate the beam forming angle of the receiving antennas receiving the WAVE signal by adding the antenna correction values of
How to prevent signal interference in your vehicle. A computer-readable recording medium storing a computer program,
The computer program is,
Comprising instructions for causing a processor to perform the method according to any one of claims 6 to 10.
A computer-readable recording medium. A computer program stored on a computer-readable recording medium,
The computer program is,
Comprising instructions for causing a processor to perform the method according to any one of claims 6 to 10.
computer program.

Images