KR100406491B1 - Apparatus For Protecting Error of Transport Information Transmission In Intelligent Transport System - Google Patents

Abstract

The present invention relates to a traffic service information transmission malfunction prevention apparatus in an intelligent transportation system.

Therefore, the present invention has a coprocessor to control the physical transmission and reception even if the main processor fails when performing the service of the intelligent communication system using a short-range wireless communication protocol, the coprocessor monitors the operation of the main processor, If the error of the main processor occurs by determining whether the error of the basic traffic information transmission service independently.

Accordingly, in the present invention, when the main processor malfunctions in the intelligent transportation system, the auxiliary processor enables basic services so that the basic traffic information transmission service itself can be maintained when an error occurs.

Description

Apparatus For Protecting Error of Transport Information Transmission In Intelligent Transport System

The present invention relates to a traffic information transmission malfunction prevention apparatus in an intelligent traffic system, and more particularly, to an apparatus for maintaining a basic traffic information transmission service itself when an error occurs because the coprocessor enables basic services when the main processor malfunctions. It is about.

In general, the basic services of the Intelligent Transport System (ITS) using the Dedicated Short Range Communication (DSRC) protocol correspond to the transmission of traffic information from the roadside base station (RSU) and the request of the vehicle terminal. It is to constantly provide services.

In addition, the intelligent transportation system is a new transportation system that improves the mobility, stability, efficiency and the traffic environment by integrating existing traffic systems with advanced technologies such as information communication, electronics, control, and computers. In order to reduce the cost of transportation, increase the use of public transportation and reduce logistics costs.

The new short range wireless communication introduced to provide the intelligent transportation system service is a communication system composed of a short range wireless communication base station (roadside device) and a vehicle terminal (vehicle mounting device) located on the roadside.

The short range wireless communication is a small output device that supports the TDMA / TDD method of the 5.8 GHz band with a communication distance of 100M or less and a transmission speed of 1 Mbps. The ITS of traffic information and control system as well as an automatic toll collection system (ETC) service The service is being accommodated.

The high frequency device of the conventional short range wireless communication base station is as shown in FIG.

Referring to FIG. 1, a tuner unit 102 for transmitting / receiving short-range wireless data with a vehicle terminal through an antenna 101, and converting a received high frequency signal into an intermediate frequency by a local oscillation signal and demodulating received data. A receiving unit 111, a transmitting unit 123 for modulating the transmission data into a local oscillating signal and outputting to the tuner unit 102 at 5.8 GHz frequency, and a localizing unit for transmitting and receiving local oscillating signals according to the transmission and reception modes. It consists of an oscillation part 131.

In addition, the tuner unit 103 generates a high frequency switch 105 which is switched to a transmission or reception path by the control unit 129 according to a transmission or reception mode, and low noise of the reception frequency (5.8 GHz) of the high frequency switch 105. A low noise amplifier (LNA) 107 for amplifying the power amplifier and a power amplifier 109 for power amplifying a transmission signal to the high frequency switch 105.

In addition, the receiver 111 includes a first bandpass filter 113 for bandpass filtering the output of the low noise amplifier 107 and a frequency converter for mixing the bandpass filtered frequency with a local oscillation signal and outputting the intermediate frequency at an intermediate frequency. 115, a second band pass filter 117 for filtering the frequency-converted signal into a signal of an intermediate frequency band, an intermediate frequency amplifier 119 for amplifying the intermediate frequency signal, and the intermediate frequency amplifier 119 And a demodulator 121 for demodulating the signal amplified by.

In addition, the transmitter 123 includes an ASK modulator 125 for ASK-modulating the transmission data into a local oscillation signal, and a third bandpass filter 127 for filtering the ASK-modulated signal into a short range radio frequency band (about 5.8 GHz). It consists of.

The local oscillator 131 includes a transmission frequency generation module 133 and a reception frequency generation module 143 operating according to transmission and reception modes, and a temperature for generating a PLL reference frequency in the transmission and reception frequency modules 133 and 143. Compensation crystal oscillators 135 and 145, PLL modules 137 and 147, fourth and fifth band pass filters 139 and 149, and driving amplifiers 141 and 151.

The high frequency device of the conventional short-range wireless communication base station as described above will be described with reference to FIG. 1.

First, in the reception mode, the control unit 129 switches the high frequency switch 105 of the tuner unit 103 to the reception path a. In this case, the frequency received through the antenna 101 is low noise amplified by the low noise amplifier 107 via the high frequency switch 105.

The output frequency of the low noise amplifier 107 is filtered by the first band pass filter 113 of the receiver 111 to a frequency of 5.8 GHz, mixed with the local oscillation signal by the frequency converter 115, and converted into an intermediate frequency. The second band pass filter 117 filters the intermediate frequency band. The intermediate frequency amplifier 119 performs intermediate frequency amplification, and the demodulator 121 demodulates the received data Rx data from the intermediate frequency and outputs the demodulated data.

Referring to the operation of the reception frequency generating module 133 of the local oscillator 131 at this time, the temperature compensated crystal oscillator (TCXO) 135 generates a PLL reference frequency, and the PLL module 137 operates by the PLL reference frequency. And generates a received local oscillation signal, and the received local oscillation signal is filtered by a fourth band pass filter 139 into a predetermined band (5.87 GHz) and then driven through the drive amplifier 141 to the frequency converter 115. By being outputted, short-range wireless data is received.

On the other hand, in the transmission mode, the control unit 129 switches the high frequency switch 105 to the transmission path b. At this time, the transmission data (Tx Data) is modulated into a local oscillation signal by the ASK (Amplitude Sequence Keying) modulator 125 of the transmitter 123, and the modulated transmission frequency is a predetermined band (by the third band pass filter 127). 5.8 GHz) is filtered, and the filtered signal is amplified to a predetermined level by the power amplifier 109 of the tuner unit 109 and then transmitted to the antenna 105 via the high frequency switch 105.

When the transmission frequency generating module 143 of the local oscillator 131 operates, the temperature compensated crystal oscillator (TCXO) 145 generates a PLL reference frequency, and the PLL module 147 operates by the PLL reference frequency. Generates a local received oscillation signal, and the received local oscillated signal is filtered to a predetermined band (5.8 GHz) by the fourth band pass filter 149 to the ASK modulator 123 through a driving amplifier 151. By outputting, short-range wireless data is transmitted.

Referring to the operation of the control unit 129 for the control of the high frequency device, conventionally, each of the phase locked loop (PLL) modules 137 and 147 for transmission and reception, and each of the transmission and reception at system initialization after the power is turned on The PLL data is transmitted to the PLL modules 137 and 147 for frequency locking. When the transmission / reception frequency locking is completed during system initialization, only the transmission / reception path switch is changed during transmission / reception switching without performing frequency locking.

However, in the conventional intelligent traffic system, when a malfunction of the control unit occurs, data transmission / reception control cannot be performed and thus a traffic information broadcast service cannot be provided.

In addition, when the control unit malfunctions in the conventional intelligent transportation system, since data transmission and reception are not performed properly, it becomes impossible to determine the location of the terminal.

As such, the conventional intelligent transportation system may not provide the basic traffic information transmission service itself when the main processor malfunctions, and may not be able to determine the location of the terminal.

Accordingly, an object of the present invention is to provide an apparatus capable of providing a basic traffic information transmission service itself even when an error of a main processor occurs in an intelligent traffic system.

Another object of the present invention is to provide an apparatus capable of checking a moving line of a terminal even when an error of a main processor occurs in an intelligent transportation system.

The present invention for achieving the above object is to control the physical transmission and reception part, monitor the operation of the main processor, even if the main processor fails when performing the traffic information transmission service to determine whether the main processor of the main processor At least an auxiliary processor for providing a basic traffic information transmission service independently if an error occurs.

The present invention further includes at least a memory for managing data by dividing a common data area between the main processor and the coprocessor into a normal operation area of the main processor and a malfunction area of the main processor.

Here, the memory according to the present invention includes a steady state control register of the main processor; A normal service data area of the main processor; An error status control register of the main processor; A default service data area; And divided into a reception data area.

1 is a block diagram of a high frequency device of a conventional short-range wireless communication base station.

2 is a block diagram of a traffic information transmission malfunction prevention device in an intelligent traffic system according to the present invention.

3 is a structural diagram of a memory map according to the present invention;

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of an apparatus according to the present invention, and includes a main processor 210, a memory 220, a secondary input / output processor 230, and an RF module 240.

Referring to FIG. 2, the memory 220 is a common data area of the main processor 210 and the auxiliary input / output processor 230, and the RF module 240 is a module that transmits and receives RF signals.

3 is a map structure diagram of a memory according to the present invention.

Referring to FIG. 3, a memory according to the present invention includes a normal state control register 310, a normal service data area 320, an error state control register 330, a default service data area 340, and a reception data area 350. Divided into The steady state control register 310 is a control register necessary for transmission in the normal state, and the normal service data area 320 is an area for storing data that is meaningful to transmit in the normal state. In addition, the error state control register 330 is a control register required for error transmission, the default service data area 340 is an area for storing data that is meaningful to be transmitted in error, and the reception data area 350 is for receiving data. The area to save.

That is, the present invention divides the data exchange area between the main processor 210 and the auxiliary input / output processor 230 into an error operation and a normal operation of the main processor 210 so that the basic traffic information service of the intelligent transportation system even when an error occurs in the main processor. Is guaranteed.

According to the exemplary embodiment of the present invention, when the main processor 210 and the auxiliary input / output processor 230 are separated, the separation criterion may be determined depending on how much authority is given to the auxiliary input / output processor 230.

In the case of an intelligent transportation system service using a short range wireless communication protocol which is a specific embodiment of the present invention, all details of the physical time data format determined by the protocol are given to the auxiliary input / output processor (or the main processor).

However, the present invention can be limited to the case of using only a simple auxiliary input / output device if it is only used to transmit, receive, modulate, and demodulate data. Therefore, the auxiliary input / output processor 230 according to the present invention puts data between the main processor 210 and the auxiliary input / output processor 230 in the memory 220 and separates mutual control signals. The present invention divides a memory area into a data area in a normal case and a data area to be transmitted in the case of a main processor error.

The main processor 210 causes the terminal to shoot up the basic broadcasting data or the up-coming emergency broadcasting data required by the service area of the intelligent transportation system even in the event of an error or down, so that the terminal passing through the communication area provides basic information in the area. Can be assured that the terminal has passed through which region.

That is, the present invention has a coprocessor to control the physical transmission and reception even if the main processor fails when performing the service of the intelligent communication system using a short-range wireless communication protocol, the coprocessor monitors the operation of the main processor 210 and In addition, the controller determines whether the main processor has an error and independently provides basic traffic information transmission service when an error occurs in the main processor.

Accordingly, in the present invention, when an error of the main processor occurs in an intelligent transportation system, specific and independent services of each terminal supported by the short-range wireless communication protocol are not possible, but whether the broadcasting data service and the terminal provided by a general roadside base station pass through a specific area. Confirmation data service can be enabled.

2 and 3, the memory according to the present invention writes down data at the beginning of each frame in the normal case, but writes down the control register and data necessary in case of error when the power is turned on in case of an abnormal case. When the main processor 210 is normal, the auxiliary input / output processor 230 reads control data and frame basic information during transmission and reception through the steady state control register 310 as shown in FIG. 3, and reads the normal service data area 320. Read data to be transmitted via the RF module 240 performs a normal data transmission and reception.

In addition, the auxiliary input / output processor 230 monitors the main processor 210 for a predetermined period of time and is normal when the auxiliary input / output processor 230 becomes active low only once using the data update signal Data_update. Recognize it as an error.

The auxiliary input / output processor 230 reads the frame order for minimum service in error and the control data necessary for transmitting and receiving the frames through the control register 310 of the error state or the error state when the main processor 210 receives an error. Can be done.

Therefore, the present invention can perform a traffic information broadcast service that takes up a substantial part of the intelligent traffic system service even in the case of an error of the main processor 210.

That is, the present invention can provide a broadcast service in which the nature and the combination of the frames are not changed actively with the terminal even when an error of the main processor occurs.

In other words, the present invention provides a frame of a general traffic information service corresponding to all terminals other than a charge collection or a complex data exchange with a terminal from the viewpoint of a roadside base station providing an intelligent transportation system service when an error occurs in the main processor. Because the order and data can be predictively held, they can be provided.

According to a specific embodiment of the present invention, frames of various broadcast data are infinitely repeated through the frame order to be transmitted to the error state control register 330 as shown in FIG. To send.

In addition, the present invention is to use the reserved bit in the frame control slot (Frame Control Slot) in the short-range wireless communication protocol when the bit is set to 1 when the main processor error is used, the terminal whether to set the bit REPORT Now it is possible to recognize this area as a main processor error, store its contents and then report it to another normal roadside base station where it can be placed in a normal service area.

Therefore, in the present invention, even if the terminal enters the roadside area where an error has occurred in the intelligent transportation system, the terminal may know whether the terminal has passed through the area, thereby ensuring the moving line confirmation of the terminal.

As described above, the present invention provides a coprocessor for judging a physical transmission / reception portion even when a main processor fails when performing service of an intelligent communication system using a short range wireless communication protocol, and the coprocessor monitors the operation of the main processor. By determining whether an error occurs in the main processor, if an error occurs in the main processor, the basic traffic information transmission service may be independently provided.

That is, according to the present invention, when the main processor malfunctions in the intelligent transportation system, the auxiliary processor enables basic services so that the basic traffic information transmission service itself can be maintained when an error occurs.

In other words, in the present invention, when an error of the main processor occurs in an intelligent transportation system, specific and independent services of each terminal supported by the short-range wireless communication protocol are not possible, but the broadcasting data service and the terminal provided by a general roadside base station pass through a specific region. Can check whether data service can be provided.

Claims (3)

A traffic information transmission malfunction prevention apparatus in an intelligent communication system using a short range wireless communication protocol, Even when the main processor fails when the traffic information transmission service is performed, it is in charge of physical transmission / reception, monitors the operation of the main processor, determines whether the main processor is in error, and independently in case of an error in the main processor, independently provides basic traffic information. And at least an auxiliary processor for providing a transmission service. The method of claim 1, And at least one memory for managing data by dividing the common data area between the main processor and the coprocessor into an area during normal operation of the main processor and an area during malfunction of the main processor. Device. The method of claim 2, wherein the memory, A steady state control register which is an area for storing data for performing control when the main processor is in a normal state; A normal service data area for storing data provided when the main processor performs a normal service; An error state control register which stores data for the main processor to perform control in an error state; A default service data area for storing data to be serviced by the main processor in an error state; Traffic information transmission malfunction prevention device, characterized in that divided into a reception data area for storing the received data.