KR200330818Y1 - Between center and local system communication structure of its - Google Patents

Abstract

The present invention relates to a communication structure between a center and a local device in an ITS that performs wireless communication between local devices and a dedicated line through a local device designated as a master with the center. Group a plurality of local devices in a group, and connect local devices in the group by a wireless communication method, and only a master local device designated as a master in the group connects to a center and a dedicated line, but the master local device The RF modem transmits and receives a control signal and information by performing data conversion with a lower slave local device through a wireless communication method; And a dedicated line modem for transmitting and receiving control signals and information by performing data conversion by the wired communication method with the center, wherein the slave local devices are connected to an upper slave local device or a lower slave local device in a wireless communication method. And an RF modem for transmitting and receiving control signals and information by performing data conversion.

Description

BETWEEN CENTER AND LOCAL SYSTEM COMMUNICATION STRUCTURE OF ITS} in Haiti

The present invention relates to a communication structure between a center and a local device in ITS. In particular, the present invention relates to a wireless communication between a local device and a center in an ITS that enables communication with a center through a local device designated as a master. And a communication structure between a local device and a local device.

Research on Intelligent Transportation Systems (hereinafter referred to as ITS) that reduces traffic congestion and provides accurate and informative traffic information to users is being conducted worldwide.

1 is a road showing a communication structure between a center and local equipment in a conventional ITS, a plurality of local equipment (20-1, 20-2, 20-3, 20-4, 20-5) through the dedicated line center (10) ) Is connected one to one.

In this configuration, a plurality of local equipment (20-1, 20-2, 20-3, 20-4, 20-5) is installed on the site (road), traffic information such as traffic volume, speed, queue Detect traffic speeds, speed violations, signal violations, dedicated lane violations, road traffic violations, overloads, traffic conditions received from the center 10, road conditions, the shortest route from the origin to the destination, and the time required. As described above, traffic information, such as the driver, is connected to the center 10 in a one-to-one manner through a dedicated line, and transmits and receives various control signals and data to and from the center 10 through a dedicated line that is connected one-to-one. do.

The center 10 is connected to each local equipment 20-1, 20- from a plurality of local equipment 20-1, 20-2, 20-3, 20-4, 20-5 through a dedicated line connected one-to-one. 2, 20-3, 20-4, 20-5) to receive various data, or to each of the local equipment (20-1, 20-2, 20-3, 20-4, 20-5) Send control signals and data.

As described above, the conventional ITS has a client / server structure in which local equipment 20-1, 20-2, 20-3, 20-4, 20-5 and the center 10 are connected one-to-one by a dedicated line. consist of.

Accordingly, conventionally, the traffic information transmitted by each of the local equipment 20-1, 20-2, 20-3, 20-4, and 20-5 is advantageously received by the center 10 in a short time. .

On the other hand, however, since the local equipment 20-1, 20-2, 20-3, 20-4, 20-5 and the center 10 are connected one-to-one by a dedicated line, each time the local equipment increases, There is also a problem in that a dedicated line is also required, resulting in increased maintenance costs.

The present invention was devised to solve the above-mentioned problem. After grouping a plurality of local devices installed in the field, wireless connection is performed between local devices, and only the local devices designated as the masters of the group are connected to the center and the dedicated line. By connecting, the purpose is to provide a communication structure between the center and the local equipment in the ITS to perform wireless communication between the local equipment and to communicate with the center through a dedicated line through the local equipment designated as the master.

1 is a diagram illustrating a communication structure between a center and local equipment in a conventional ITS.

2 is a view showing a communication structure between a center and local equipment in the ITS according to an embodiment of the present invention.

3 is a view showing an example of the configuration of the master local equipment 210 applied to the present invention.

4 exemplarily illustrates a configuration of a slave local device 220 applied to the present invention.

*** Explanation of symbols for the main parts of the drawing ***

100. center, 210, 220, 230, 240, 250. local equipment,

211, 221. Video camera unit, 212, 222. Vehicle detection unit,

213, 223. controller, 214, 224. memory,

215. Dedicated line modem, 216, 225.RF modem

In the ITS according to an embodiment of the present invention for achieving the above object, the communication structure between the center and the local equipment, a plurality of local equipment installed in the field is grouped into a group, between the local equipment in the group It is preferable that only the master local equipment connected in a wireless communication scheme and designated as a master in the group is connected to a center and a dedicated line.

Here, the plurality of local equipment, the master local equipment is connected to the center and a dedicated line; It is preferable to be divided into slave local devices connected to the center through the master local device.

In addition, the master local equipment, RF modem for performing data conversion and the transmission and reception of control signals and information by the lower slave local equipment and the wireless communication scheme; It is preferable that the center is provided with a dedicated line modem for performing data conversion by a wired communication method and transmitting and receiving control signals and information.

The slave local devices preferably include an RF modem that transmits and receives a control signal and information by performing data conversion through a wireless communication method with an upper slave local device or a lower slave local device.

Hereinafter, with reference to the accompanying drawings will be described in detail the communication structure between the center and the local equipment in the ITS according to a preferred embodiment of the present invention.

Figure 2 is installed on the road, the site (on the road) showing the communication structure between the center and the local equipment in the ITS according to an embodiment of the present invention, a plurality of local equipment (210, 220, 230 grouped in a group) , 240 and 250 are connected by a wireless communication method, and only the master local equipment 210 designated as the master of the group is connected to the center 100 by a dedicated line.

As described above, the local equipment 210, 220, 230, 240, 250 may be indirectly connected to the center 100 through the master local equipment 210 and the master local equipment 210 directly connected to the center 100. It is divided into slave local equipment (220, 230, 240, 250) connected to the master local equipment 210, as described above, is directly connected to the center 100 with a dedicated line, the center 100 through a dedicated line And transmit and receive various control signals and data, and are connected to the lower slave local device 220 in a wireless communication method, and transmit and receive various control signals and data with the lower slave local device 220 in a wireless communication method.

On the other hand, the slave local equipment (220, 230, 240, 250) transmits and receives a variety of control signals and data in a wireless communication method with each of the upper / lower slave local equipment connected in a wireless communication method.

As described above, each slave local device 220, 230, 240, 250 has a high / low relationship with other slave local devices, and the high / low relationship is determined by the distance from the master local device 210. . That is, the slave local device that is in close proximity to the master local device 210 is higher than the slave local device that is not.

As described above, when the upper / lower relationship between the slave local devices 220, 230, 240, 250 is determined, each slave local device 220, 230, 240, 250 receives the received radio according to the determined upper / lower relationship. The data signal is relayed to the upper or lower slave local device.

As described above, the reason why the wireless data signal cannot be transmitted to the corresponding destination at once and through the local equipment existing in the middle is due to the distance between the local equipments. The distance between the local device 210 and the slave local device 250 located at the end becomes 40 km so that the wireless data signal transmitted from the master local device 210 does not reach the slave local device 250 located at the end. . Accordingly, the local devices 220, 230, and 240 located between the master local device 210 and the slave local device 250 positioned at the end are relayed.

As described above, the local equipment (210, 220, 230, 240, 250) is installed on the site (on the road) to detect traffic conditions such as traffic volume, speed, queues, speed violations, signal violations, dedicated lanes By sending down enforcement data such as violations, side street violations, overloads, or providing the driver with traffic information such as traffic conditions, road conditions, the shortest route from the point of departure to the destination, and the time required, It can be implemented as a detector, a sign board, or a signal violation interrupter.

3 is a road showing an exemplary configuration of the master local equipment 210 applied to the present invention, when the local equipment is an image detector, the master local equipment 210 is an image camera unit 211, the vehicle detection unit 212 And a control unit 213, a memory unit 214, an RF modem 216, and a dedicated line modem 215.

In such a configuration, the image camera unit 211 is installed in place to obtain a road image.

The vehicle detection unit 212 detects the speed of the vehicle, the presence or absence of the vehicle, the occupancy rate and the like through the image acquired by the vehicle detection sensor or the camera unit.

The controller 213 generates traffic information such as traffic volume, speed, occupancy rate, vehicle type, queue, and image information by using the image data received from the image camera unit 211 and the detection data received from the vehicle detector 212. .

The memory unit 214 stores the traffic information generated by the controller 213.

The RF modem 216 transmits and receives various control signals and information by performing data conversion with the lower slave local device 220 by a wireless communication method.

The dedicated line modem 215 transmits and receives various control signals and information by performing data conversion with the center 100 by a wired communication method.

As described above, the operation of the master local device 210 is as follows.

For example, when a control signal (digital signal) requesting traffic information or various data of a specific local equipment 250 installed in the field is transmitted from the center 100 through a dedicated line modem 215, the received control. The signal is transferred to the RF modem 216 to be converted into a wireless data signal, and the converted wireless data signal is transmitted to the lower slave local device 220 through the wireless antenna.

Subsequently, when the traffic information (wireless data signal) of the specific local device 250 is transmitted from the lower slave local device 220 through the RF modem 216, the received traffic information is transmitted to the dedicated line modem 215 to be digital. The signal is converted into a signal, and the converted digital signal is transmitted to the center 100 through a dedicated line.

4 is a road illustrating an exemplary configuration of a slave local device 220 applied to the present invention. When the local device is an image detector, the slave local device 220 includes an image camera unit 221 and a vehicle detector 222. , A control unit 223, a memory unit 224, and an RF modem 225.

In such a configuration, since the video camera unit 221, the vehicle detection unit 222, the control unit 223, and the memory unit 224 are similar in configuration and operation to the master local device 210, a description thereof will be omitted. Shall be.

However, the RF modem 225 transmits and receives various control signals and information by performing data conversion with the upper / lower slave local equipment 210/230 by a wireless communication method.

As described above, the operation of the slave local device 220 is as follows.

For example, when the wireless data signal is received from the master local device 210 through the RF modem 225, it is checked whether the destination local device ID included in the received wireless data signal and its local device ID match. When the two local device IDs match, the traffic information or various data stored in the memory unit 224 is transmitted to the master local device 210 through the RF modem 225 according to the received wireless data signal. If the ID does not match, the received wireless data signal is bypassed to the lower slave local device 230. When the wireless data signal is received from the lower slave local device 230, the wireless data signal is transmitted to the master local device 210.

Meanwhile, the center 100 is connected one-to-one with a dedicated line only to the master local equipment 210 designated as the master, and transmits and receives various control signals and data through the dedicated line only to the master local equipment 210.

Accordingly, the center 100 transmits and receives various control signals and data to and from the local devices 220, 230, 240, and 250 other than the master local device 210 through the master local device 210.

Hereinafter, a communication operation between a center and local equipment in an ITS according to an embodiment of the present invention will be described with reference to FIGS. 2 to 4.

First, the center 100 transmits control signals / data (digital signals) to the master local equipment 210 connected by a dedicated line.

Meanwhile, the master local equipment 210 receives the control signal / data transmitted from the center 100 through the dedicated line modem 215, but receives the control signal / data from the center 100. ) Analyzes the control signal / data to determine whether the destination of the control signal / data received from the center 100 is itself.

If the destination of the control signal / data received from the center 100 described above is itself, the received control signal / data is processed, and the result is converted into a digital signal to convert the dedicated line modem 215. If the transmission to the center 100, and the destination of the control signal / data received from the center 100 is not itself, the control signal / data received from the center 100 is transmitted to the RF modem 216 to wireless After converting to a data signal, and transmits to the lower slave local device 220 through a wireless antenna.

As described above, the lower slave local device 220 receiving the wireless data signal transmitted from the master local device 210 compares the local device ID with the destination local device ID included in the received wireless data signal. Determine if the two local device IDs match.

As described above, when the two local device IDs match, the received wireless data signal is processed, the processing result is converted into a wireless data signal, and transmitted to the master local device 210, which is a higher device, and the two local devices. If the ID does not match, amplify the wireless data signal received from the master local device 210 and transmits it to the lower slave local device 230.

As described above, the lower slave local device 230 receiving the wireless data signal transmitted from the upper slave local device 220 compares its local device ID with the destination local device ID included in the received wireless data signal. Determine if the two local device IDs match.

As described above, when the two local device IDs match, the received wireless data signal is processed, and the processing result is converted into a wireless data signal and transmitted to the upper slave local device 220. If it does not match, amplify the wireless data signal received from the upper slave local device 220 and transmits it to the lower slave local device 240.

Subsequently, a wireless data signal including information is received from the lower slave local device 240. When the wireless data signal is received from the lower slave local device 240, the received wireless data signal is amplified to a higher slave. Send to local device 220.

Meanwhile, the upper slave local device 220 receiving the wireless data signal transmitted by the lower slave local device 230 amplifies the received wireless data signal and transmits it to the master local device 210, and the lower slave local device 220. The master local device 210 that has received the wireless data signal including the information is transferred to the dedicated line modem 215 to convert the received wireless data signal into a digital signal, and then the center through the dedicated line modem 215. Send to 100.

For example, as shown in FIG. 2, local equipment 1, 2, 3, 4, 5 (210, 220, 230, 240, 250) are grouped into a group, and local equipment 1 210 is the master local. When designated as equipment, local equipment 1 210 receives control signals from center 100 via leased line modem 215, wherein the control signals received from center 100 are received from local equipment 5 250. FIG. In the case of a control signal requiring traffic information, the control signal received from the center 100 is applied to the RF modem 216 and converted into a wireless data signal, and then the local device 2 220 that is a lower slave local device through the wireless antenna. ) And the local device 2 (220) receiving the wireless data signal from the local device 1 (210), which is the master local device, amplifies the received wireless data signal and transmits the received wireless data signal to the local device 3 (230) of the lower slave local device. do.

The local device 3 (230) receiving the wireless data signal from the local device 2 (220) amplifies the transmitted wireless data signal and transmits it to the local device 4 (240), and the local device 4 (240) also local device 3 (230) Amplified and transmitted to the local device 5 (250).

As described above, the local device 5 250 receiving the wireless data signal relayed by the local devices 2, 3, and 4 (220, 230, 240) is requested by the center 100 according to the received wireless data signal. After reading the traffic information from the memory unit and applying it to the RF modem, converting it into a wireless data signal, and transmitting it to the local device 4 (240), the upper slave local device, through the wireless antenna, and transmitting the wireless data signal from the local device 5 (250). Receiving the local device 4 240 amplifies the received wireless data signal and transmits to the local device 3 (230).

Local device 3 (230) receiving the wireless data signal from the local device 4 (240) amplifies the transmitted wireless data signal transmitted to the local device 2 (220), local device 2 (220) also local device 3 (230) Amplify the wireless data signal received from the) and transmits to the local device 1 (210), the master local device.

As described above, the local device 1 210, which has received the wireless data signal relayed by the local devices 4, 3, and 2 (240, 230, 220), applies the received wireless data signal to the dedicated line modem 215. After converting into a digital signal, it is transmitted to the center 100 is connected by a dedicated line.

In the ITS of the present invention, the communication structure between the center and the local equipment is not limited to the above-described embodiments, and may be variously modified and implemented within the range allowed by the technical idea of the present invention.

According to the communication structure between the center and the local equipment in the ITS of the present invention as described above, after grouping a plurality of local equipment installed in the field, the local equipment is wirelessly connected, and the local equipment designated as the master of the group By linking the bay to the center and a dedicated line, there is no additional line cost as the local equipment expands, reducing maintenance costs.

Claims (5)

A plurality of local devices installed in the field are grouped into a group so that the local devices in the group are connected by wireless communication, and only the master local devices designated as masters in the group are connected to the center and a dedicated line. Features a communication structure between a center and local equipment in Haiti. The method of claim 1, wherein the plurality of local equipment, A master local equipment connected to the center by a dedicated line; The communication structure between the center and the local device in Haiti, characterized in that divided into slave local devices connected to the center through the master local device. The method of claim 2, wherein the master local equipment, An RF modem for transmitting and receiving control signals and information by performing data conversion with a lower slave local device through a wireless communication method; And a dedicated line modem for transmitting and receiving control signals and information by performing data conversion by means of a wired communication method with the center. The method of claim 2, wherein the slave local devices, The communication structure between the center and the local equipment in Haiti, characterized in that having a high / low relationship according to the distance to the master local equipment. The method of claim 2, wherein the slave local devices, And a RF modem for transmitting and receiving control signals and information by performing data conversion by an upper slave local device or a lower slave local device by a wireless communication method.