KR101313618B1 - An apparatus for transmitting and receiving a real-time traffic light status information and the method thereof - Google Patents

Abstract

The present invention relates to an apparatus and method for transmitting and receiving real-time status information of a traffic signal, and more particularly, it relates to an apparatus and method for transmitting and receiving real-time status information of a traffic signal through real- This allows the driver to visually and audibly identify the information and to utilize the information in the navigational function of the navigation terminal, thereby reducing the time it takes to reach the destination, fuel consumption, road congestion, environmental pollution and accident The present invention provides an apparatus and method for transmitting and receiving status information of a traffic light located in front of a driver of a vehicle to a plurality of data broadcast signals in real time in order to reduce the risk.

Description

TECHNICAL FIELD [0001] The present invention relates to an apparatus and method for transmitting and receiving real-time status information of a traffic signal,

The present invention relates to an apparatus and method for transmitting and receiving real-time status information of a traffic signal, and more particularly, to an apparatus and method for transmitting and receiving real-time status information of a traffic signal, The present invention relates to an apparatus and method for transmitting the same status information at the same time through data broadcasting, receiving and displaying the same status information on a plurality of vehicle terminals, and utilizing the status information for a route guidance.

The driver in the road is likely to maintain or speed up the driving speed of the vehicle in order to pass through the traffic lights before the signal is changed if the direction of the traffic light ahead in the driving direction coincides with the direction of his / . This is a risk factor for unnecessary fuel consumption and traffic safety.

If the driver can know the remaining time of the current direction of the traffic light ahead, it is determined whether or not his / her vehicle can pass through the traffic light in the forward direction within that time, and whether to maintain the speed of the vehicle or to stop the vehicle So that unnecessary fuel consumption can be reduced. This judgment can be made by the driver himself or by calculating the distance from the navigation terminal installed in the vehicle to the forward traffic light and automatically calculating the arrival time to the front traffic light and comparing it with the remaining time of the signal, You can also guide.

Information on the traffic lights installed on the roads is already being monitored in real time by the traffic control center, and it is not difficult to extract the remaining time information and signal holding time information of each traffic light from the traffic control center.

As a conventional technique, there is a case where a remaining time display device is attached to a traffic signal for a vehicle (e.g., China) and a pedestrian signal.

In recent years, a traffic light for pedestrians has been installed to display the remaining time using LED display devices. In some foreign countries, a traffic light signal for a vehicle is indicated by a direction and an LED display device is used to display the remaining time as a number . However, since the distance between the traffic light and the pedestrian is not so long in the case of the traffic light for the pedestrian, sufficient information can be transmitted to the pedestrian by only displaying the remaining time in numerals. However, in the case of the traffic light for the vehicle, There is a limitation in transmitting the remaining time information to the numeric display device installed in the traffic light. In particular, when the weather condition is poor due to mist, rain, snow, etc., the information transmission distance is further reduced. Therefore, the effect of installing the remaining time display device is not large compared to the cost of installing the remaining time display device.

Rather, when a vehicle traffic light is displayed with various information such as a direction instruction and remaining time information, the structure of the traffic light becomes complicated, causing confusion in the driver's view.

Korean Patent No. 0988833 discloses a navigation system using signal interlocking information. The navigation system includes a traffic congestion display command signal and a traffic interlock display command signal. And displays the traffic congestion information and the signal interworking information on the basis of the received information. The user and the navigation terminal can select the route more efficiently by considering the signal interworking. Specifically, traffic information related to traffic signals is provided through the TPEG (Traffic Protocol Expert Group) traffic information service, and traffic signal related information is provided as a technique for utilizing the information in the route searching step of the navigation terminal installed in the vehicle The present invention is similar to the present invention. However, since the type of information provided is limited to providing only information on roads to which signals are linked, The present invention is different from the present invention in that the traffic signal information can not be utilized for a plurality of drivers who do not travel in the signal interlocking section. In addition, the information such as the road section in which the signals are interlocked or the information such as the rotation prohibition / permission is not information to be changed at every moment, but the information provided by the present invention is information changed every moment, Effect can be obtained.

The present invention was devised to solve the above problems of the existing invention, and transmits the information and signal holding time information of a plurality of traffic lights installed on the road at once through data broadcasting, and through a data broadcasting receiver installed in a vehicle Drivers can check the information visually and audibly, and use the information in the navigation function of the navigation terminal to reduce the time it takes to reach the destination, fuel consumption, road congestion, environmental pollution and risk of accidents. It aims to reduce. To this end, the present invention proposes an apparatus and method for real-time transmission and reception of status information of a signal lamp located in front of a driver of a vehicle in addition to a plurality of data broadcast signals.

In order to achieve the above object, the apparatus for transmitting real-time state information of a traffic light according to the present invention provides an instruction and signal holding time of the individual traffic lights from a traffic light information providing apparatus including a traffic control center, a plurality of individual traffic lights, and a combination thereof. A traffic light information input unit configured to input traffic light information including; A traffic light fixture information DB for storing fixed information of traffic lights including the plurality of individual traffic light IDs, installation positions, node IDs, and combinations thereof; And a traffic light state information encoder for generating record data of the plurality of individual traffic lights by using the individual traffic light information, traffic light fixed information, and reference time information provided from a time information providing apparatus including a network and a GPS. And a TPEG format encoder configured to encode record data of the plurality of individual signal lamps generated by the traffic light state information encoder in a TPEG format. The apparatus may further include a data broadcast encoder for encoding the record data of the plurality of individual signal lamps generated by the traffic light state information encoder into a predetermined data broadcast format including a file format or a stream format; And a data broadcast transmission unit; A data broadcast encoder for encoding a signal generated by the TPEG format encoder into a predetermined data broadcast format including a file format or a stream format; And a data broadcast transmission unit; As shown in FIG. Wherein the data broadcast is at least one of DAB, DAB +, DMB, AT-DMB, ATSC-M / H, digital radio broadcast (including DRM, DRM +, and HD-Radio) and FM additional broadcast. Traffic light status information HTTP server providing traffic light status information in HTTP protocol, traffic light status information socket server providing traffic light status information in socket communication, for transmitting record data of the plurality of individual traffic lights generated by a traffic light status information encoder. Signal lights that provide traffic light status information through short-range wireless communications, including Dedicated short-range communications (DSRC), Urban Traffic Information System (UTIS), and Wireless Access in Vehicular Environments (WAVE). A roadside base station of the road where it is located; It may further include any one of.

On the other hand, the real-time state information receiving apparatus of a traffic light according to the present invention GPS receiver for extracting the location and time information of the vehicle; A broadcast receiver for receiving a broadcast signal; A data broadcasting decoding unit for extracting and decoding a data broadcasting signal from a broadcasting signal; A traffic light fixed information DB for storing fixed information of a traffic light including a plurality of individual traffic light IDs, installation positions, node IDs, and combinations thereof; Extract the traffic light status information from the data broadcast signal input from the data broadcast decoder, search for the traffic light ID corresponding to the current location of the vehicle from the traffic light fixed information DB based on the coordinates input from the GPS receiver, and obtain GPS time information. A traffic light state including extracting the traffic light state information corresponding to the traffic light ID of the current time point, outputting remaining time information to the display device, outputting the sound output to the voice output device as an effect sound, and performing a combination thereof. An information extraction unit; In addition, the apparatus for receiving real-time state information, such as a traffic signal, according to the present invention for achieving the above object comprises a GPS receiver for extracting the location and time information of the vehicle; A data receiving unit for receiving data including traffic light status information from at least one of a roadside base station on a road using a near field communication medium including a socket server, an HTTP server, and DSRC, UTIS, and WAVE; A traffic light fixed information DB for storing fixed information of a traffic light including a plurality of individual traffic light IDs, installation positions, node IDs, and combinations thereof; The traffic light status information is extracted from the data input by the data receiver, the traffic light ID corresponding to the current location of the vehicle is searched from the traffic light fixed information DB based on the coordinates input by the GPS receiver, and the current is based on the GPS time information. A traffic light state information extracting unit including extracting traffic light state information corresponding to the traffic light ID of a viewpoint and outputting remaining time information to a screen display device, outputting the sound output device as an effect sound, and performing a combination thereof; It is configured to include, and go straight, turn, stop so that the arrival time to the destination to the minimum based on the indication and the remaining time and the remaining time and the remaining time of the traffic light direction and the remaining time in the direction of the current vehicle extracted from the traffic light state information extraction unit It may further comprise a road guide information generator for determining whether or not to combine the result with the electronic map to display on the screen or output by voice.

On the other hand, real-time status information receiving method of a traffic light according to the present invention comprises the steps of extracting the location and time information of the vehicle through the GPS receiver; Receiving a broadcast signal through a broadcast receiver; A data broadcast decoding step of extracting and decoding a data broadcast signal from the broadcast signal; The traffic light state information is extracted from the data broadcast signal input in the data broadcast decoding step, the traffic light ID corresponding to the current position of the vehicle is searched from the traffic light fixed information DB based on the extracted GPS coordinates, and the GPS time information is obtained. Traffic light status information including extracting the traffic light status information corresponding to the traffic light ID of the current time point as a reference, outputting the remaining time information to the display device, outputting the sound output to the voice output device as an effect sound, and performing a combination thereof. Extracting; Or including

Extracting location and time information of the vehicle through a GPS receiver; A data receiving step of receiving data including traffic light status information from at least one of a roadside base station on a road using a near field communication medium including a socket server, an HTTP server, and DSRC, UTIS, and WAVE; Extracting traffic light state information from the data input in the data receiving step, searching for the traffic light ID corresponding to the current position of the vehicle from the traffic light fixed information DB based on the extracted GPS coordinates, and presently based on the GPS time information. Extracting the traffic light state information corresponding to the traffic light ID of the time point, outputting the remaining time information to the screen display device, outputting the sound output to the audio output device as an effect sound, and extracting the traffic light state information including performing a combination thereof. step; As shown in FIG. In addition, based on the direction of the traffic light in front of the current vehicle traveling direction extracted in the step of extracting the traffic light state information and the indication of the remaining time and the neighboring traffic light and the remaining time, the driving time is straight, rotated, and stopped. And determining whether or not to generate the road guidance information by combining the result with the electronic map and displaying the result on a screen or by outputting it by voice.

In addition, the method for receiving real-time status information of a traffic light according to the present invention includes the steps of: (1) extracting the coordinates and time information of the vehicle from the GPS data; (2) retrieving the traffic light ID of the vehicle driving direction forward from the traffic light fixing information DB; (3) Among traffic light state information data inputted through broadcast reception and data broadcast decoding or input from at least one of a roadside base station on a road using a near field communication medium including a socket server, an HTTP server, and DSRC, UTIS, and WAVE. Extracting traffic light state information corresponding to a vehicle driving direction front traffic light; (4) determining the validity of the traffic light status information; And (5) displaying the traffic light status information on a screen display device or inputting it to a road guide information generator to generate road guide information reflecting the signal waiting time and outputting the result as a video or audio signal. If the traffic light status information in the step (4) includes only the basic information, the step (5) to perform only if the value of the signal time plus the signal holding time is greater than the current time in step (4) Features,

Here, in the step (4), when the valid time information is included in the traffic light status information, step (5) is performed only when the value obtained by adding the valid time to the reference time is larger than the current time. In the step (4), when the traffic light status information further includes the next direction indication information in addition to the basic information, the signal waiting time of each indication is added to the reference time in turn, and then the indication of the time when the value becomes larger than the current time is indicated. Judging by the current indication, the remaining time is characterized by subtracting the current time from the value, and in step (4) there is no valid time information in the traffic light status information or the current time is the valid time at the reference time If the value is smaller than the added value, the current indication remaining time can be estimated by inferring from the reference time and the additional information.

The present invention relates to an apparatus for transmitting and receiving real-time status information of a traffic light and a method thereof. The present invention relates to a plurality of traffic lights installed on a road (direct, left / right rotation, U-turn, stop, etc.) and signal holding time information. Through real-time transmission at the same time, and through the data broadcasting receiver (navigation terminal or traffic light information display terminal) installed in the vehicle, multiple drivers can visually check the information, allowing the driver to change the driving according to the change of traffic light status. By preparing and using the information in the navigation function of the navigation terminal, it can contribute to reducing the time to reach the destination, fuel consumption, road congestion, environmental pollution and the risk of accidents.

1 is an overall system configuration diagram according to a preferred embodiment of the present invention,
FIG. 2 is a block diagram of a MOT system coding system using a TPEG format according to a preferred embodiment of the present invention,
3 is a block diagram of a MOT system encoding system which does not use a TPEG format according to a preferred embodiment of the present invention,
FIG. 4 is a block diagram of a TDC scheme coding system using a TPEG format according to a preferred embodiment of the present invention,
FIG. 5 is a block diagram of a TDC coding system that does not use a TPEG format according to a preferred embodiment of the present invention,
FIG. 6 is a configuration diagram of a coding system configuration method for a smartphone or a tablet PC and a system using server / terminal communication according to a preferred embodiment of the present invention,
7 is a configuration diagram of a system for providing traffic light status information using a local area communication medium according to a preferred embodiment of the present invention,
8 is a block diagram of a data broadcast receiving terminal according to a preferred embodiment of the present invention,
FIG. 9 is a block diagram of a receiving terminal by socket communication, HTTP data communication, or short-range wireless communication according to a preferred embodiment of the present invention,
10 is a flowchart of the operation of a receiver according to a preferred embodiment of the present invention,
11 illustrates a configuration of a navigation terminal screen display according to a preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

1 is an overall system configuration diagram according to a preferred embodiment of the present invention. The traffic control center 1 collects and manages the status information of the traffic lights from the plurality of traffic lights 2, and the collected status information of the traffic lights is provided to the traffic light status information encoding system 3, and the traffic light status information. The encoding system 3 encodes the traffic light state information and sends the encoded traffic light state information to the broadcasting center 4 of the broadcasting station. At this time, information can be transmitted and received between the traffic control center (1), the plurality of traffic lights (2), the traffic light status information encoding system (3) and the broadcasting center (4) by utilizing various broadcast communication means including wired and wireless communication lines. . The broadcasting center 4 transmits the coded traffic light state information to the transmitting station 5 through the data broadcasting channel again, and transmits the traffic light state to the individual vehicle terminal 6 or to the individual terminal 6 again. The data broadcast signal including the information is transmitted, and the user can check the state of the traffic light 2 placed in front of the user through the terminal.

Hereinafter, a description will be made of a traffic signal indicating state and a remaining time information collecting method.

Since the real-time indication state of each traffic light 2 is already being monitored in the traffic control center 1 and the instruction can be remotely controlled, the current technology can be used to collect the instruction and signal holding time information of each traffic light. There is no difficulty.

However, when the instruction and signal retention time information is transmitted through broadcasting, a reception delay time of a predetermined time (several seconds) occurs in the process of being encoded into a broadcast signal and transmitted to a receiver. Therefore, There arises a problem that the past information is received by the delay time.

However, the state information of a traffic signal is not information that changes irregularly but information that is regularly changed at regular intervals. That is, since the state after a predetermined time from the specific time is determined, it is important to code and transmit future information not including the current time information but a certain time after the reception delay time, at the time of coding with the broadcast signal.

For example, assuming that the reception delay time of a DMB (Digital Multimedia Broadcasting) data broadcast is 5 seconds, the status information of a traffic light transmitted at 15:00:00 is not 15:00:00, 00 < / RTI > 05 < RTI ID = 0.0 > 05, < / RTI > and this information is received by the terminal at 15: 00: 05, which is after a 5 second reception delay time. In the same way, it is necessary to transmit information including future state information after 5 seconds every moment.

By doing so, the terminal can extract the state information of the traffic light at the time when the vehicle is traveling.

At this time, the reference time information should be transmitted as basic information of the traffic light state information. If the clock used when the reference time information is generated is different from the clock of the terminal, the information may be used at an incorrect point in the terminal. The same clock should be used.

Since the vehicle data broadcasting receiver is equipped with a GPS (Global Positioning System) receiving module, the reference time of the traffic light state information input to the traffic light state information encoding unit of the present invention is already synchronized to the GPS time or the traffic light state information encoding of the present invention. When the encoder encodes the reference time according to the GPS time, the receiver can process the information without a problem. In order to encode the reference time of the state information of the traffic light in accordance with the GPS time in the traffic light state information encoder, the traffic light state information encoder should synchronize with the NTP server or extract time information received from the GPS receiver. Synchronizing a system to an NTP (Network Time Protocol) server or GPS time is a well-known technique. It can be synchronized with an NTP server connected to the Internet, or it can be installed and synchronized with an NTP server on an internal network. A GPS receiver may be installed in the traffic light state information encoder without extracting the server to extract time information included in the GPS signal to synchronize the system time.

Hereinafter, the broadcast signal encoding will be described.

Since the frequency resources are limited when data is transmitted using data broadcasting, it is necessary to minimize the amount of data to be transmitted.

In the case of transmitting a plurality of traffic light information through data broadcasting, traffic light information received by a specific terminal includes a plurality of traffic light information in addition to information corresponding to a traffic light around the current location.

In order to distinguish information corresponding to a specific traffic light among a plurality of traffic light information, a signal light ID, installation location coordinates, and explanation information that can distinguish each traffic light should be provided. Therefore, the signal lamp fixed information DB, such as the installation position coordinates of the signal lamp, the intersection name, etc., is mounted on the storage device of the terminal at the terminal manufacturing stage, and the information of the signal lamps to be installed is different from the technology of the present invention . As an example of a method of updating the traffic light fixed information DB, the navigation terminal user may update the traffic light fixed information DB together when updating the electronic map.

The ID of the traffic light and the variable information corresponding thereto are transmitted through the data broadcasting to match the information stored in the terminal.

In this case, the variable information to be transmitted to the broadcast includes the reference time, the current instruction, and the current instruction retention time as basic information, and if there is room in the transmission network, the types of instructions after the current instruction and the signal retention time and effective time of each instruction To send additional information.

In the description of the present invention, information is displayed in a text format for the sake of understanding, but in order to minimize the data transmission amount in the encoding step, all the information uses a binary number format instead of a text format. The traffic light ID uses an integer value, and reference time, indication holding time, and valid time values use an integer value in seconds. [Table 1] shows an example of assignment of an integer value according to the kind of instruction, and an instruction is assigned by assigning an integer value.

Type of instruction Assigned value stop 0 Straight One turn left 2 Straight / Left Turn Simultaneous Signal 3 Yellow light 4

[Table 2] is an indication and signal holding time at a specific time point before being input to the traffic light state information encoding unit of the present invention. For example, the type and signal of an indication corresponding to one repetition period from a specific time point of a signal light with an ID of 100 An example of the holding time is shown.

Signal change time indication Signal holding time (seconds) 15:00:00 Straight 15 15:00:15 Yellow light 2 15:00:17 turn left 10 15:00:27 Yellow light 2 15:00:29 stop 60

As shown in [Table 2], if the signal is changed in order of going straight, yellow light, left turn, yellow light, and stop instruction from 15: 00,00 second reference time, and after that, the above instruction is repeated 15:00 As an example of a specific time point after the second, the basic information transmitted by broadcasting at 15:00:03 includes the information shown in [Table 3].

Item value Explanation Traffic light ID 100 Reference time 15:00:00 The closest reference time from 15:00:03 Present order One Integer value for straight ahead Signal holding time 15 second

If there is room in the bandwidth of the broadcasting network, as shown in [Table 4], additional information including information repeated by the number of instructions may be transmitted.

Item value Explanation indication 4 Yellow light Signal holding time 2 second indication 2 turn left Signal holding time 10 second indication 4 Yellow light Signal holding time 2 second indication 0 stop Signal holding time 60 second

The basic information includes only the current indication and signal holding time information of the traffic light, and the additional information includes the indication and signal holding time information after the current indication of the traffic light.

When the reference time and the current instruction and signal holding time information are transmitted as shown in [Table 3] and [Table 4], the receiver compares the most recently received reference time with the current time of the receiver to determine the signal state at a specific time The receiver can determine the state of the traffic light at the current time point even if the information is not transmitted every second. Therefore, it is possible to determine the transmission period of the information in consideration of the spare bandwidth of the broadcasting network. However, if the information transmission period is too long, errors may accumulate and cause a difference from the actual signal state. Therefore, it is preferable to transmit the information transmission period as frequently as possible within a bandwidth allowable range. The bit rate per second (bps) of the data broadcast transmission channel should be determined in consideration of the number of simultaneously transmitted signals and data transmission amount according to the type of information. The bit rate per second (bps) of the channel is not automatically determined according to the data transmission amount.In the broadcasting station, the operator sets the bit rate per second (bps) of the channel. This is because

If you do not want the receiver to use outdated information, you can transmit the effective time information along with the indication and signal retention time information.

For example, when the valid time is transmitted in 60 seconds, the terminal waits until the latest information is received without using the information when the reference time of the most recently received information is 60 seconds before the current time of the terminal.

When encoding the basic information and the additional information described above, it is preferable to include information on the number of instructions and encode the information so that the terminal can easily distinguish the information as shown below.

When the number of instructions is 1, that is, when only basic information is transmitted, the valid time is meaningless, and thus a value of 0 is transmitted.

When the number of instructions is N, that is, when additional information is transmitted, the instructions and signal holding time information are repeated by N. In the case of transmitting only the current instruction and the next instruction, N is 2, and in the case of transmitting by the number of instructions in the entire one-time repetition period, N is the number of instructions constituting one repetition of the signal. If the value of the valid time is 0, the terminal does not repeatedly use the information. If the value of the valid time is greater than 0, the information is repeatedly used within a range where the difference between the terminal current time and the reference time is not larger than the valid time .

Below are some examples of coding of the traffic light status information.

In [Table 2], traffic light state information encoding when only basic information of 15:00:00 is transmitted is as follows.

In Table 2, the signal state information coding in the case of additionally transmitting the next signal state information together with the basic information of 15:00:00 is as follows.

In Table 2, the traffic light state information encoding in the case where the effective time is set to 60 seconds and transmitted together with the entirety of the one-time repeat indication after 15:00:00, is as follows.

In order to minimize the amount of transmission, instead of displaying reference time information for each traffic light, a method of encoding and combining signal lights having the same reference time in one unit may be used. The method of coding the signal lights having the common reference time in one unit is described in the coding method when using the DMB data broadcasting medium.

The broadcasting media that can be used for transmission to the data broadcasting are as follows. First, the case of DMB data broadcasting will be explained.

DMB data broadcasting includes a detailed transmission method such as TDC (Transparent Data Channel), MOT (Multimedia Object Transport), FIDC (Fast Information Data Channel), IP tunneling, etc., which can be used to transmit the status information of the traffic light of the present invention. Considering the amount of transmission data and the ease of terminal development, the FIDC and IP tunneling methods are not appropriate in terms of the amount of transmission data and ease of terminal development, respectively, and it is preferable to use a TDC and a MOT method.

However, the traffic light state information data of the present invention is independent of these transmission schemes, and DMB data services are PAD (Program Associated Data), NPAD (Non-PAD), TDC, MOT, BWS (Broadcasting Web Site), DLS (Dynamic Label). It is apparent that the service can be serviced by a new transmission method including service), still image, FIDC, IP tunneling, and a combination thereof.

First, since the MOT method is a method of transmitting data in units of files, it is easy to bundle and transmit information having common attributes in units of files.

Since the traffic light status information is not information of repeated carousel characteristics but real-time information, it is preferable to use the MOT header mode to reduce unnecessary information transmission when using the MOT system.

When using the MOT method, the criteria for grouping the information into files can be determined in various forms according to the requirements of the service operator, such as the area where the traffic light is installed and the importance of the intersection where the traffic light is installed according to the priority. There are different structures depending on whether they are used or not.

First, the case of using the TPEG format will be described as follows.

The file name is set as SID_A.SID_B.SID_C_SCID_NNN.bin, and the data constituting the file is composed of the number m of messages (traffic lights), m (number of messages) * messages, where the message includes a traffic light ID, A reference time, a number of instructions, an indication and a signal holding time (if the number of instructions is greater than 1, the number of instructions is repeated), and an effective time.

When using the TPEG format, it includes data defined in the basic format of TPEG other than the attributes of the messages listed above. For example, if sni_component (0A) of TPEG part 3 (SNI) is used or long_string data (0A) of TPEG part 3 Format, the number of messages (traffic lights) m, the common reference time, m (number of messages) * traffic light state record data only, and there is no need to include additional data, thereby reducing the amount of information transmitted.

2 is a block diagram of a MOT system encoding system using a TPEG format according to a preferred embodiment of the present invention, an NTP (Network Time Protocol) server 10, a traffic light information input unit 11, a traffic light state information encoding unit 12 ), The traffic light fixed information DB 13, the TPEG format encoder 14, the MOT encoder 15, the data broadcast MUX 16, and the DMB MUX 17. The NTP server 10 is a time synchronization server used when generating reference time information, and is an NTP server connected to the Internet or an NTP server connected to the internal network, and may be replaced with a GPS receiver in some cases. The traffic light information input unit 11 performs a function of receiving an instruction and signal holding time information of each traffic light from the traffic control center 1 or the individual traffic light 2. The traffic light fixing information DB 13 is a DB in which the traffic light ID is a key value and the fixed information such as the installation position of the traffic light, the node ID, and the like is a field. The traffic light state information encoding unit 12 receives the indication of the individual traffic lights and signal holding time information from the traffic light information input unit 11 and receives the traffic light fixing information through the traffic light fixing information DB 13 to receive the traffic light ID and reference time. And record data such as an individual signal including the indication, signal holding time, and valid time information as fields. The TPEG format encoder 14 encodes record data of individual signal lamps generated by the traffic light state information encoder in TPEG format. The MOT encoding unit 15 performs file creation, MOT header configuration, and file compression on data encoded in the TPEG format. The data broadcasting MUX 16 performs data group generation and packet timing on the MOT-coded data, and the DMB MUX 17 encodes the packet into a DMB broadcasting signal.

However, since the data defined in the TPEG format must be transmitted together with the traffic light status information, there is a problem that the total transmission data amount becomes large. Therefore, in order to minimize the amount of transmitted data, TPEG You can configure the file without formatting as follows:

Next, the case where the TPEG format is not used will be described as follows.

The file name can be any file name specified by the user, and the data constituting the file is composed of the number m of messages (traffic lights) included in the file, the common reference time, m (number of messages) , Where the traffic light status record is made up of record data including the traffic light ID, the number of indicators, the indication and the signal holding time (if the number of indications is greater than 1, the number of indications is repeated), and the validity time.

When the TPEG format is not used, as shown in FIG. 3, the TPEG encoding unit is excluded in FIG.

3 is a block diagram of a MOT system encoding system that does not use the TPEG format according to an embodiment of the present invention, the NTP server 10, the traffic light information input unit 11, the traffic light state information encoding unit 12, the traffic light fixed Information DB 13, MOT encoder 15, data broadcast MUX 16, and DMB MUX 17 are configured. The NTP server 10, the traffic light information input unit 11, the traffic light state information encoding unit 12, and the traffic light fixed information DB 13 are the same as those in FIG. 2, except that the MOT encoder 15 ) Performs file generation, MOT header configuration, and file compression on record data of individual traffic lights generated by the traffic light state information encoding unit. The data broadcasting MUX 16 performs data group generation and packet timing, and the DMB MUX 17 encodes the packet into a DMB broadcasting signal.

Next, the TDC method is a method of transmitting data in the form of a stream. When signaling information is transmitted in the TPEG format, the file name is not used like the MOT method, but is encoded in the following structure.

In the case of using the TPEG format, the traffic light status information component frame is composed of the number of messages (traffic lights) m, m (number of messages) * messages, and the message includes traffic light ID, message version, reference time, And a signal holding time (it is repeated as many times as the number of instructions when the number of instructions is greater than 1) and an effective time. When using the TPEG format, it includes the data defined in the TPEG basic format other than the attributes of the messages listed above. For example, if sni_component (0A) of TPEG part 3 (SNI) is used or long_string data (0A) of TPEG part 3 Format, the number of messages (traffic lights) m, the common reference time, m (number of messages) * traffic light state record data only, and there is no need to include additional data, thereby reducing the amount of information transmitted.

4 is a configuration diagram of a TDC encoding system using a TPEG format according to a preferred embodiment of the present invention, and includes an NTP server 10, a traffic light information input unit 11, a traffic light state information encoding unit 12, and traffic light fixed information. And a DB 13, a TPEG format encoder 14, a TDC encoder 15-1, a data broadcast MUX 16, and a DMB MUX 17. FIG. The NTP server 10, the traffic light information input unit 11, the traffic light state information encoding unit 12, the traffic light fixed information DB 13 and the TPEG format encoding unit 14 are the same as in FIG. However, the TDC encoder 15-1 generates a TDC stream for record data such as individual signals encoded by the TPEG format encoder 14. The data broadcasting MUX 16 performs data group generation and packet timing on the generated TDC stream, and the DMB MUX 17 encodes the packet into a DMB broadcasting signal.

If the TPEG format is used when the TDC method is used, there is a problem that the total amount of transmitted data becomes large due to the repetition of the data defined in the TPEG format as in the MOT method. Therefore, in order to minimize the amount of transmitted data, You can construct a stream like this.

Since the TDC scheme is a stream data transmission, a sync byte is required. The data constituting the stream includes the length of the stream, the number m of messages (traffic lights) included in the stream, the common reference time, m (number of messages) * traffic light status record data, The number of instructions, the instruction and the signal holding time (if the number of instructions is greater than 1), the record data including the valid time, and the CRC.

5 is a configuration diagram of a TDC encoding system not using the TPEG format according to an embodiment of the present invention, which is the same as the configuration except for the TPEG encoding unit in FIG. 4, and includes an NTP server 10 and a traffic light information input unit ( 11), the traffic light state information encoding unit 12, the traffic light fixed information DB 13, the TDC encoding unit 15-1, the data broadcasting MUX 16, and the DMB MUX 17. The NTP server 10, the traffic light information input unit 11, the traffic light state information encoding unit 12 and the traffic light fixed information DB 13 are the same as in the case of Fig. 2, except that the TDC encoding unit 15 -1) generates a TDC stream for the record data of the individual signal lamps encoded by the traffic light state information encoder 12. The data broadcasting MUX 16 performs data group generation and packet timing on the generated TDC stream, and the DMB MUX 17 encodes the packet into a DMB broadcasting signal.

When using the MOT and TDC methods, the service operator can decide whether or not to use the TPEG format. It is also apparent that data broadcasting formats other than the MOT format and the TDC format may be applied depending on the requirements of the service.

Next, when the DAB, DAB + and AT-DMB systems are utilized as the data broadcasting medium for transmitting the information of the present invention, up to the data broadcasting MUX step of FIGS. 2, 3, 4 and 5 are applied to DMB data broadcasting The same technique applies. The data broadcasting signal generated in the data broadcasting MUX is input to the MUX of the broadcasting system and is transmitted in the corresponding broadcasting signal.

On the other hand, in order to transmit the information of the present invention using FM additional broadcasting, the same technique as that applied to DMB data broadcasting is performed until the TPEG format encoder of FIG. 4 or the traffic light state information encoder of FIG. In the later stages, the general structure of the FM additional broadcasting system is used. However, if the traffic light status information is transmitted using FM additional broadcasting without being limited to the stream method, the structure of the FM data additional broadcasting system is retained as it is after the TPEG format encoder of FIG. 4 or the traffic light status information encoder of FIG. 5. Can be used.

On the other hand, when transmitting information of the present invention using ATSC-M / H data broadcasting, when transmitting information in a file format, the DMB MOT method of FIG. 2 TPEG format encoder or FIG. The same technique as that applied to the MOT method is used, and in later stages, the general structure for file format data transmission of the ATSC-M / H broadcasting system is used.

When transmitting the information of the present invention using ATSC-M / H data broadcasting, when transmitting the information in the stream format, up to the stage of FIG. The same technique is used, and later steps will use the general structure for stream format data transmission of the ATSC-M / H broadcasting system.

On the other hand, for the purpose of transmitting the traffic light status information of the present invention, regardless of whether the file format data transmission or the stream format data transmission of the ATSC-M / H broadcasting system, the data format supported by the ATSC-M / H broadcasting system If you can apply anything.

Meanwhile, the technology of the present invention can be applied to digital radio broadcasting media including DRM, DRM +, and HD-Radio. When transmitting the information of the present invention by using digital radio broadcasting, when transmitting information in a file format, the steps up to FIG. 2 TPEG format encoder of FIG. The same technique is used and later steps will use the general structure for file format data transmission of the digital radio broadcasting system.

In addition, when transmitting the information of the present invention using digital radio broadcasting, up to the stage of FIG. 4 TPEG format encoder or FIG. 5 traffic light state information encoder of the DMB TDC scheme, the same as that applied to DMB data broadcasting. The technology will be used and in later stages the general structure for the transmission of stream-type data in the digital radio broadcasting system will be used.

On the other hand, if the purpose of transmitting the traffic light status information of the present invention, regardless of whether the file format data transmission or stream format data transmission of the digital radio broadcasting system, any data format supported by the digital radio broadcasting system may be applied. It's okay.

Since the traffic light status information provided in the present invention is information to be changed at every moment and must be provided to a plurality of users at the same time, it is effective to utilize a data broadcast medium rather than a one-to-one communication medium. However, in order to apply the present invention to a terminal which does not support the data broadcasting reception function such as a smartphone and a tablet PC, a server that provides traffic light status information is connected to the server from a smartphone and a tablet PC. Can be implemented to receive.

6 is a block diagram of a system for using a coding system for a smartphone or a tablet PC and a server / terminal communication according to a preferred embodiment of the present invention, an NTP server 10, a traffic light information input unit 11, Traffic light status information encoding unit 12, traffic light fixed information DB 13, traffic light status information HTTP server 18 or traffic light status information socket server 19 and smart phone and tablet PC 20 can be configured. have.

The structure for generating the information transmitted from the server 18, 19 to the smartphone and tablet PC 20 is the same until the traffic light state information encoder 12 in the above description, and the data broadcast in the subsequent step The difference is that there is no need to go through the encoding process for transmission to the network. Instead, an HTTP server or a socket communication server for providing traffic light status information is provided to provide information to the terminal. A method of receiving data by connecting to the traffic light status information servers 18 and 19 is generally well known, and may use the HTTP protocol and the client / server method using socket communication.

The traffic light status information HTTP server 18 is a server for providing traffic light status information through the HTTP protocol, and the traffic light status information socket server 19 is a server for providing traffic light status information through socket communication. The servers 18 and 19 convert and provide the traffic light information to record data of the individual traffic lights encoded by the traffic light state information encoding unit 12 so as to be suitable for HTTP protocol and socket communication, respectively. The smartphone and tablet PC 20 may receive the traffic light information proposed by the present invention by accessing the servers 18 and 19.

In the case of using short-range wireless communication, the signal light information provided by the present invention can utilize the information more effectively in the terminal when not only the current vehicle position but also the traffic light information near the vehicle traveling route and the traveling route are simultaneously provided. (DSRC), Urban Traffic Information System (UTIS), and so on, since it is possible to obtain a sufficient effect by providing information to a vehicle around a specific traffic light. ) And WAVE (Wireless Access in Vehicular Environments).

7 is a configuration diagram of a system for providing traffic light state information using a short-range communication medium according to a preferred embodiment of the present invention, including an NTP server 10, a traffic light information input unit 11, a traffic light state information encoding unit 12, Traffic light fixture information DB 13, roadside base station 21 on the road, and the vehicle terminal 22 around the roadside base station.

The structure for generating the traffic light status information in providing the information in the DSRC, UTIS and WAVE methods is the same until the traffic light status information encoder 12 in the above description, and is generated by the traffic light status information encoder 12 The received information is transmitted to the roadside base station 21 on the road where each traffic light is located and received by the vehicle terminal 22 around the roadside base station. The information transmission between the traffic light state information encoding unit 12 and the roadside base station 21 on the road and the information transmission between the roadside base station 21 and the vehicle terminal 22 on the road can be easily implemented by techniques that are already widely used.

8 is a block diagram of a data broadcast receiving terminal according to a preferred embodiment of the present invention, a GPS receiver 100, a broadcast receiver 110, a data broadcast decoder 120, a traffic light state information extractor 130, a road. It includes a route guide information generation unit 140, a screen display device 150, a voice output device 160, a traffic light fixed information DB 170 and the electronic map 180.

The GPS receiver 100 extracts the position and time information of the vehicle from the GPS signal and transfers the signal to the traffic light state information extractor 130. The broadcast receiver 110 transmits the broadcast signal to the data broadcast decoder 120 after receiving the broadcast signal. Deliver broadcast signals. The data broadcast decoder 120 extracts and decodes the data broadcast signal from the received broadcast signal and transfers the decoded data to the traffic light state information extractor 130. The traffic light fixation information DB 170 is a DB having a traffic light ID as a kit value and fixed information such as an installation position coordinate of the traffic light, an installation position node ID, and a description of the traffic light as a field, and the traffic light state information extraction unit 130 stores data The traffic light state information is extracted from the data broadcasting signal inputted by the broadcast decoder 120, and the traffic light ID corresponding to the current position of the vehicle is searched from the traffic light fixed information DB based on the GPS coordinates, and at the present time based on the GPS time. Extracting the corresponding traffic light state information and outputting the remaining time information to the screen display device 150 of the terminal, outputting the sound output device 160 as an effect sound, and performing a combination thereof; The information is transmitted to the road guide information generation unit 140. The route guidance information generating unit 140 determines whether the vehicle is traveling straight ahead, turning, or stopping the vehicle so that the arrival time is minimized to the destination on the basis of the traffic light instruction and remaining time, And displays the result on the screen display device 150 or outputs it to the audio output device 160. The audio output device 160 outputs a signal light indication and remaining time information as a sound or an effect sound, or outputs a signal indicating the state of the traffic light state And outputs the guidance as a voice.

FIG. 9 is a block diagram of a receiving terminal using socket communication, HTTP data communication, or short-range wireless communication according to a preferred embodiment of the present invention, and instead of the broadcast receiving unit 110 and the data broadcasting decoding unit 120 in the configuration of FIG. 8. It comprises a socket communication unit 120-1, HTTP data communication unit 120-2 or short-range wireless communication unit 120-3, in the case of socket communication, and the traffic light state information socket server 19 through the socket communication unit Connect to receive the traffic light status information and output to the traffic light status information extraction unit, and in the case of HTTP data communication, connect with the traffic light status information HTTP server 18 through the HTTP data communication unit to receive the traffic light status information to extract the traffic light status information In the case of short-range wireless communication, the traffic light state information is received from the roadside base station 21 on the road through the short-range wireless communication unit. Status information is output to the extraction. The processing of the remaining data is as described in FIG.

When a server for a smart phone and a tablet PC is provided with information of the present invention using an HTTP protocol or a socket communication, unlike a terminal receiving information through data broadcasting as shown in FIG. 9, The receiver and the data broadcast decoding unit need not be implemented. The data received from the server is input to the traffic signal status information extraction unit, and the subsequent processing steps are the same as those of the broadcast reception terminal.

Also, as shown in FIG. 9, a terminal receiving information through short-range wireless communication used in DSRC, UTIS, and WAVE needs to be implemented with a broadcast receiving unit and a data broadcasting decoding unit unlike a terminal receiving information through data broadcasting shown in FIG. There is no. The data received from the roadside base station through the short distance wireless communication is input to the traffic signal state information extracting unit, and the subsequent processing steps are the same as those of the broadcast receiving terminal.

10 is a flowchart of the operation of a receiver according to a preferred embodiment of the present invention.

First, the vehicle terminal extracts the coordinates and time information of the vehicle from the GPS data (step 1), and then retrieves the traffic light ID of the vehicle driving direction forward from the traffic light fixing information DB (step 2), and again, the broadcast receiving unit The traffic light state information corresponding to the vehicle driving direction forward traffic light is extracted from the traffic light state information data input through the data broadcasting decoding unit (step 3). Here, the extracted traffic light status information is composed of basic information and additional information, the basic information is information that must be received for the operation of the terminal, including the traffic light ID, reference time, current direction indication, signal holding time, The additional information is information transmitted when there is a margin in the broadcast network transmission bandwidth. The additional information includes a next direction indication, a signal holding time (if the number of indications is two or more, repeat the number of indications), and an effective time.

Next, the validity of the information is determined from the extracted traffic light state information (step 4). As a result of the determination, it is determined whether or not the process of step 5 is performed.

1) If the received information includes the valid time information, the process of step 5 is performed only when the valid time plus the valid time is larger than the current time (time).

2) If only the basic information is received, the process of step 5 is performed only when the reference time plus the signal holding time is larger than the current time. The remaining time is as follows. Remaining time = reference time + signal holding time - current time

3) If the next direction indication information is additionally included in addition to the basic information, the signal waiting time of each indication is added to the reference time in turn, and the indication of the time when the value becomes larger than the current time is determined as the current indication, and the remaining time is The value is obtained by subtracting the current time.

4) If there is no valid time information, the current remaining time can be estimated by inferring from reference time and additional information. For example, if the information is received with traffic light ID 100, reference time 13:00:00 seconds, straight 10 seconds, yellow light 1 second, left turn 10 seconds, yellow light 1 second, stop 100 seconds, the total signal holding time of the received information The sum is 122 seconds, which can be calculated directly up to the current time of 13: 02: 02.However, the frequency at which the next signal is repeated can be calculated based on the received information, so the signal at 13:02:03 is straight and the remaining time. It can be estimated that is 9 seconds. However, if the valid time information is specified as 122 seconds, the process of step 5 is not performed until the latest information is received after 13:02:03 seconds. In order to prevent such a gap, the traffic light state information encoder must transmit information so that the terminal can receive the latest information before the valid time elapses.

Next, the received information is displayed on the screen display device or inputted to the route guidance information generating section to generate route guidance information reflecting the signal waiting time and outputting it as video or audio (step 5). This process is naturally repeated (step 6).

FIG. 11 is a diagram illustrating a configuration of a navigation terminal screen display according to a preferred embodiment of the present invention, in which a current instruction, a remaining time, and a next instruction of a traffic signal ahead of the vehicle in a vehicle traveling direction are displayed on a screen display device.

The vehicle terminal of the present invention may be implemented in the form of a navigation terminal, or may be implemented in the form of a dedicated terminal having a traffic light status information display function.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.

1: Traffic control center 2: Traffic light
3: Traffic light status information coding system 4: Broadcasting center
5: Transmitting station 6: vehicle / personal terminal
10: NTP server 11: traffic light information input unit
12: traffic light status information encoding unit 13, 170: traffic light fixed information DB
14: TPEG format encoding unit 15: MOT encoding unit
15-1: TDC encoding unit 16: Data broadcast MUX
17: DMB MUX 18: Traffic light status information HTTP server
19: Traffic light status socket server 20: Smartphone and tablet PC
22: vehicle terminal around roadside base station 21: roadside roadside base station
100: GPS receiver 110: broadcast receiver
120: Data broadcast decoding unit 120-1: Socket communication unit
120-2: HTTP data communication unit 120-3: short-range wireless communication unit
130: traffic light state information extraction unit 140: road guidance information generation unit
150: Screen display device 160: Audio output device
180: electronic map

Claims (22)

delete delete delete delete delete delete delete delete delete delete delete delete A GPS receiver for extracting location and time information of the vehicle;
A broadcast receiver for receiving a broadcast signal;
A data broadcasting decoding unit for extracting and decoding a data broadcasting signal from a broadcasting signal;
A traffic light fixed information DB for storing fixed information of a traffic light including a plurality of individual traffic light IDs, installation positions, node IDs, and combinations thereof;
Extract the traffic light status information from the data broadcast signal input from the data broadcast decoder, search for the traffic light ID corresponding to the current location of the vehicle from the traffic light fixed information DB based on the coordinates input from the GPS receiver, and obtain GPS time information. Extracting the traffic light state information corresponding to the traffic light ID at the current time and outputting the remaining time information to the screen display device of the terminal, outputting the sound to the voice output device as an effect sound, and performing a combination thereof. Traffic light status information extracting unit; And
Whether the direction of arrival to the destination is minimized based on the direction of the traffic light and the remaining time of the current vehicle traveling direction extracted from the traffic light state information extractor, the indication and the remaining time of the neighboring traffic lights, or a combination thereof. A road guidance information generation unit which determines and displays the result on the screen in conjunction with the electronic map, outputs it by voice, or outputs a combination thereof; Device for receiving real-time status information, such as traffic lights, characterized in that it comprises a. A GPS receiver for extracting location and time information of the vehicle;
A data receiving unit for receiving data including traffic light status information from at least one of a roadside base station on a road using a near field communication medium including a socket server, an HTTP server, and DSRC, UTIS, and WAVE;
A traffic light fixed information DB for storing fixed information of a traffic light including a plurality of individual traffic light IDs, installation positions, node IDs, and combinations thereof;
The traffic light status information is extracted from the data input by the data receiver, the traffic light ID corresponding to the current location of the vehicle is searched from the traffic light fixed information DB based on the coordinates input by the GPS receiver, and the current is based on the GPS time information. A traffic light state information extracting unit including extracting traffic light state information corresponding to the traffic light ID of a viewpoint and outputting remaining time information to a screen display device, outputting the sound output device as an effect sound, and performing a combination thereof; And
Whether the direction of arrival to the destination is minimized based on the direction of the traffic light and the remaining time of the current vehicle traveling direction extracted from the traffic light state information extractor, the indication and the remaining time of the neighboring traffic lights, or a combination thereof. A road guidance information generation unit which determines and displays the result on the screen in conjunction with the electronic map, outputs it by voice, or outputs a combination thereof; Device for receiving real-time status information, such as traffic lights, characterized in that it comprises a. delete Extracting location and time information of the vehicle through a GPS receiver;
Receiving a broadcast signal through a broadcast receiver;
A data broadcast decoding step of extracting and decoding a data broadcast signal from the broadcast signal;
The traffic light state information is extracted from the data broadcast signal input in the data broadcast decoding step, the traffic light ID corresponding to the current position of the vehicle is searched from the traffic light fixed information DB based on the extracted GPS coordinates, and the GPS time information is obtained. Traffic light status information including extracting the traffic light status information corresponding to the traffic light ID of the current time point as a reference, outputting the remaining time information to the display device, outputting the sound output to the voice output device as an effect sound, and performing a combination thereof. Extracting; And
In the step of extracting the traffic light state information, the traffic light direction and the remaining time of the current vehicle traveling direction ahead, the direction of the neighboring traffic lights and the remaining time or a combination of these, go straight, turn, stop Determining whether or not the result is combined with an electronic map and displaying the result on a screen, outputting by voice, or outputting a combination thereof; Real-time state information receiving method of a traffic light, characterized in that comprises a. Extracting location and time information of the vehicle through a GPS receiver;
A data receiving step of receiving data including traffic light status information from at least one of a roadside base station on a road using a near field communication medium including a socket server, an HTTP server, and DSRC, UTIS, and WAVE;
Extracting traffic light state information from the data input in the data receiving step, searching for the traffic light ID corresponding to the current position of the vehicle from the traffic light fixed information DB based on the extracted GPS coordinates, and presently based on the GPS time information. Extracting the traffic light state information corresponding to the traffic light ID of the time point, outputting the remaining time information to the screen display device, outputting the sound output to the audio output device as an effect sound, and extracting the traffic light state information including performing a combination thereof. step; And
In the step of extracting the traffic light state information, the traffic light direction and the remaining time of the current vehicle traveling direction ahead, the direction of the neighboring traffic lights and the remaining time or a combination of these, go straight, turn, stop Determining whether or not the result is combined with the electronic map and displayed on the screen, or outputting by voice or a combination thereof to generate the road guide information; real-time status information receiving method of a traffic light, characterized in that it comprises a; . delete (1) extracting coordinates and time information of the vehicle from the GPS data;
(2) retrieving the traffic light ID of the vehicle driving direction forward from the traffic light fixing information DB;
(3) Among traffic light state information data inputted through broadcast reception and data broadcast decoding or input from at least one of a roadside base station on a road using a near field communication medium including a socket server, an HTTP server, and DSRC, UTIS, and WAVE. Extracting traffic light state information corresponding to a vehicle driving direction front traffic light;
(4) determining the validity of the traffic light status information; And
(5) displaying the traffic light status information on a screen display device or inputting the signal to a road guide information generation unit to generate road guide information reflecting the signal waiting time and outputting the result as video or audio; If the traffic light status information in the step (4) includes only the basic information, the step (5) to perform only if the value of the signal time plus the signal holding time is greater than the current time in step (4) Real-time status information receiving method of a traffic light characterized in that. 20. The method according to claim 19, wherein in the step (4), when the traffic light status information includes the valid time information, step (5) is performed only when the valid time plus the valid time is larger than the current time. Real-time status information receiving method of traffic light. 20. The method according to claim 19, wherein in the step (4), if the traffic light status information further includes the next direction indication information in addition to the basic information, the signal waiting time of each indication is sequentially added to the reference time, and the value is the present time. The method of receiving real-time status information of a traffic light, characterized in that the indication of the time when it becomes larger is determined as the current indication, and the remaining time is obtained by subtracting the current time from the value. 20. The real-time state of traffic lights according to claim 19, wherein in the step (4), if the traffic light status information does not have valid time information, the current remaining time can be estimated by inferring from the reference time and additional information. How to receive information.

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