KR100407936B1 - method for communicating among vehicles with wireless in intelligent traffic network system, and terminal for realizing the method - Google Patents

Abstract

The present invention relates to wireless communication, and more particularly, to an inter-vehicle wireless communication method suitable for short-range communication by vehicle-to-vehicle moving to a group using an intelligent transportation network system and a terminal apparatus for the same.

The present invention provides a method and apparatus capable of supporting a voice service using an intelligent traffic network system, and in particular, the present invention provides a short distance capable of supporting voice communication between vehicles moving to a group as well as traffic information service using an intelligent traffic network system. A wireless communication method and a terminal device for the same are provided.

Description

Method for communicating among vehicles with wireless in intelligent traffic network system, and terminal for realizing the method

The present invention relates to wireless communication, and more particularly, to an inter-vehicle wireless communication method suitable for short-range communication by vehicle-to-vehicle moving to a group using an intelligent transportation network system and a terminal apparatus for the same.

In general, the intelligent traffic network system is primarily intended for services related to traffic information, and traffic information providers that collect traffic information on the road provide the current traffic conditions to subscribers of each vehicle in real time using the intelligent traffic network system.

Since the intelligent transportation network system is an additional service type using the existing wireless network, the overall facility investment cost is much lower. Therefore, it is attracting attention because it can easily provide real-time traffic information at low cost.

1 is a block diagram showing the configuration of a general intelligent traffic network system.

Referring to FIG. 1, the overall system configuration includes vehicle terminals 10, 11, 12, roadside base stations 20, 21, and control center 30.

The vehicle terminals 10, 11, and 12 are mounted inside the vehicle and perform wireless communication through connection with the roadside base stations 20 and 21.

Accordingly, the roadside base stations 20 and 21 located around the road support wireless access and wireless communication to the vehicle terminals 10, 11 and 12, and are connected to the control center 30 by wire.

The control center 30 collects various data from various roadside base stations 20 and 21 located around a road, that is, information such as a location and a traveling speed of a vehicle using the road, and combines it with geographic information for processing. This processed information is managed in real time in the database 31.

In this way, the control center 30 processes the information collected from the roadside base station 20, 21, and transmits the requested information through the corresponding roadside base station of the vehicle location when there is an information provision order from the vehicle.

Thereafter, the vehicle terminals 10, 11, and 12 receive information required by the vehicle terminal and display the road traffic information so that the vehicle subscriber can view the selected road traffic situation information.

For example, using the existing intelligent transportation network system described above, if a subscriber of a vehicle equipped with a vehicle terminal (T1) 10 wants to go to a certain area in Seoul, the subscriber may move from the current location to the geographic information of the destination or the destination. It selects the overall traffic information, such as road conditions, time required and bottleneck section of the road to the base station (B1) 20 corresponding to the current location.

Thereafter, the roadside base station (B1) 20 informs the control center 30 of the request of the vehicle subscriber, receives the traffic information collected and processed from the control center 30 and the vehicle terminal (T1) of the vehicle subscriber (10). To be sent).

The vehicle terminal (T1) 10 receives the information transmitted from the roadside base station (B1) 20 and shows it to the subscriber through the display device.

In the intelligent traffic network system described so far, only data is transmitted and received, and voice signals are not transmitted or received. Thus, no device for transmitting and receiving voice signals is provided.

This has the disadvantage that it cannot support the voice service if it is required by using the intelligent transportation network system in the future.

Disclosure of Invention An object of the present invention is to provide a method and apparatus capable of supporting a voice service using an intelligent transportation network system.

The present invention also provides a short-range wireless communication method capable of supporting voice communication between vehicles moving to a group as well as a traffic information service using an intelligent traffic network system, and another object of the present invention is to provide a terminal device for realizing the method. have.

A feature of a vehicle-to-vehicle wireless communication method in an intelligent traffic network system according to the present invention for achieving the above object is a traffic network system comprising at least one vehicle terminal and at least one roadside base station based on information data transmission. In the step of analyzing the characteristics of the data input to the calling vehicle terminal, and if the voice data is input as a result of the analysis, the voice data encoding the calling party's voice, and the calling party's unique number assigned to the calling vehicle terminal And forming and transmitting a data group having a predetermined length into which the called-side unique number assigned to the called vehicle terminal and a synchronization code for synchronization are inserted, and the called vehicle terminal sends the transmitted data group. Receiving, decoding, and selectively outputting the speech. Eojinda.

Preferably, the step of receiving the transmission data group comprises the steps of confirming a calling party unique number and a called party unique number inserted in the received data group, and using a synchronization code inserted in the received data group. Synchronizing, synchronizing with the unique number and synchronizing, deciphering the voice data inserted into the data group; and outputting the decoded voice data by voice of the called subscriber.

In-vehicle wireless communication apparatus according to the present invention for achieving the above object. A duplexer for controlling the flow of the received signal and the input / output signal, a reception processor for down-frequency processing the received signal and outputting the voice, a transmission processor for up-frequency processing the voice of the subscriber and transmitting it as a wireless signal, and the reception processor Decodes the down-frequency processed digital signal in the codec and the codec for encoding the digital signal to be up-frequency processed in the transmission processor, and a modem for transmitting and receiving data including voice data with the roadside base station, including data communication between the vehicle and voice data Send and receive.

Preferably, the roadside base station is provided with a wireless communication device for transmitting and receiving voice data of the same configuration as the inter-vehicle wireless communication device, a wired connection device for a wired connection is further provided.

1 is a block diagram showing the configuration of a general intelligent traffic network system.

Figure 2 is a block diagram showing the configuration of a vehicle terminal according to the present invention.

3 is a flowchart showing a vehicle-to-vehicle wireless communication procedure in the intelligent traffic network system according to the present invention.

* Description of the symbols for the main parts of the drawings *

110: duplexer 120: speaker

130: microphone 140: power supply

150: external connection unit 160: key input unit

170: screen display unit 180: control unit

200: modem 210: codec

300: reception processing unit 500: transmission processing unit

Hereinafter, a preferred embodiment of an inter-vehicle wireless communication method and a terminal device therefor in an intelligent traffic network system according to the present invention will be described with reference to the accompanying drawings.

2 is a block diagram showing the configuration of a vehicle terminal according to the present invention.

Reference is made to FIGS. 1 and 2 to make the description of the present invention clearer.

The vehicle terminal includes an antenna 100 through which a radio signal is transmitted and received, a duplexer 110 for controlling the flow of a received signal and a transmit signal input and output through the antenna 100, and a radio signal by down-frequency processing a voice signal. A reception processor 300 for outputting a voice signal, a speaker 120 for outputting a voice signal so that a subscriber can hear a voice signal, a transmission processor 500 for outputting a radio signal by up-frequency processing the voice signal of the subscriber, and a voice signal. A microphone 130 for converting a signal into an electrical signal, a power supply unit 140 for supplying power to the reception processor 300 and the transmission processor 500, and a screen display for visually viewing the state of the vehicle terminal. 150, a key input unit 160 having a plurality of buttons arranged to allow a subscriber to operate a vehicle terminal, an external connection unit 170 for connecting with other external devices, and the above-listed modules. The controller 180 controls appropriately according to the state of each unit, and the memory 190 stores data necessary for control by the controller 180 and program data related to additional services of the vehicle terminal.

Here, the reception processor 300 may include a reception high frequency amplifier 310 for amplifying a received high frequency signal, a reception high frequency filter unit 320 for selectively passing only a required signal among the amplified reception high frequency signals, and a local oscillation intermediate. An intermediate frequency oscillator 330 for generating a frequency signal, a frequency mixer 340 for mixing the amplified received high frequency signal and a local oscillation intermediate frequency signal generated from the intermediate frequency oscillator 330, and a necessary signal among the mixed signals Only the reception intermediate frequency filter unit 350 for selectively passing the signal, a primary intermediate frequency amplifier 360 for amplifying the filtered intermediate frequency signal, a secondary intermediate frequency amplifier (not shown), and an oscillator. A demodulation unit 370 for demodulating a frequency amplified signal, a voice band filter unit 380 for passing only a voice signal of a band required by the demodulated signal, and amplifying a voice signal to a required size Is composed of a reception voice signal amplifier 390 and a noise control switch 400 for switching according to the noise level of the received signal.

In addition, the transmission processor 500 may include a first transmission voice signal amplifier 510 for amplifying a voice signal converted into an electrical signal by the microphone 130, and a voice signal for passing only a required frequency band among the amplified voice signals. A filter 520, a second transmission voice signal amplifier 530 for amplifying the filtered signal, a transmission frequency oscillator 540 for generating a local oscillation transmission frequency signal, and a transmission frequency oscillator 540 A modulator 550 for mixing the local oscillation transmission frequency signal and an audio signal, a transmission high frequency amplifier 560 for amplifying high frequency transmission signals, and a transmission high frequency filter unit 570 for selectively passing only signals of a required frequency And a terminal amplifier 580 which amplifies a high frequency signal to a finally required output.

In addition to the vehicle terminal according to the present invention, a modem 200 for transmitting and receiving data including voice data with the roadside base station, and a codec for performing encoding and decoding to realize a voice service ( CODEC) 210.

The codec 210 decodes the encoded voice signal upon reception and encodes the voice signal upon transmission.

In addition, in the present invention, a terminal having the same configuration as the vehicle terminal is provided at a roadside base station supporting wireless connection and wireless communication with the vehicle terminal, and a separate wired connection device for a wired connection is provided.

As can be seen from the above terminal configuration, in the present invention, signal processing blocks for transmitting and receiving voice signals are added for voice service in an intelligent traffic network system, and a speaker 120 for voice output and a microphone 130 for voice input are provided. This is also added.

As a result, when the subscriber selects a desired function through the vehicle terminal, each terminal provided in the vehicle and the roadside base station of the subscriber selectively provides data communication and near-vehicle wireless communication.

Next, a description will be given of a vehicle-to-vehicle wireless communication method according to the terminal configuration.

Basically, each vehicle terminal is given a unique number. This is for the subscriber to support a dedicated voice communication with the subscriber of a specific vehicle, wherein the calling vehicle terminal includes the unique number assigned to itself and the unique number assigned to the called vehicle terminal selected by the calling subscriber together with the voice signal. Automatically transmit to roadside base station.

Then, the roadside base station transmits the received voice signal and the unique number to the called vehicle terminal, so that the called vehicle terminal detects the calling vehicle terminal. Therefore, the called vehicle terminal can make an accurate response to the call of the other party.

As another example, if a plurality of vehicles equipped with the vehicle terminal mentioned above are moving at a short distance to the same destination, the calling party may call the multiple subscribers to perform one-to-many communication.

Referring to the one-to-many communication in more detail, it is assumed that the unique numbers assigned to the respective vehicle terminals 10, 11, and 12 in FIG. 1 are "001", "002", and "003", respectively.

At this time, if the calling subscriber selects the corresponding unique numbers of the called vehicle terminals T2 and T3 using the key input unit to receive voice communication with the other two subscribers, and inputs the voice to be sent through the microphone, the calling vehicle terminal (T1) automatically transmits the unique number " 001 " assigned to itself and the unique numbers " 002 " and " 003 " of the called vehicle terminals T2 and T3 selected by the calling party to the roadside base station B1 together with the voice signal. Send by

Thereafter, the roadside base station B1 transmits the received voice signal and each unique number to the called vehicle terminals T2 and T3, so that the called vehicle terminals T2 and T3 detect the calling vehicle terminal T1. After that, the voice is output to the speaker according to the called party's request. Therefore, the called vehicle terminal can make an accurate response to the call of the other party.

Thereafter, a continuous voice communication is performed between these subscribers.

In the present invention, a communication protocol for a signal is required to enable voice wireless communication between vehicles as described above.

In the case of conventional digital communication, a digital signal is composed of a data stream. The data group includes a 2-byte preamble, a 4-byte sync field, and a 2-byte functional field for smooth communication. It consists of a function and a 64-byte data field.

Here, the unique number of the calling vehicle terminal and the called vehicle terminal are inserted into the preamble.

In addition, the sync field sync is inserted with a code for synchronization.

In addition, the function field (function) of the field is a field defining the characteristics of the data inserted in the data field (data), when the terminal provided in the vehicle and the roadside base station receives the data group, the control unit (CPU) analyzes it and then functions The data of the data field is processed according to the analysis result of the field.

Therefore, in the present invention, when the control unit CPU analyzes the function field, and the data inserted into the data field is voice data, the called subscriber who has received the data group from the roadside base station is called. Check if it is.

The control unit CPU transmits the data inserted into the data field data among the received data groups to the codec and decodes if the terminal is the call target.

The codec decodes the input data and reproduces it as a voice signal. The reproduced voice signal is amplified and output through a speaker.

On the contrary, when transmitting a voice signal from the terminal, the voice signal input to the microphone is encoded by a codec and then converted into a digital signal.

The converted digital signal becomes a data stream conforming to the protocol of voice wireless communication by the processing of the control unit CPU.

This data group is then transmitted to a roadside base station via a modem and a transmission processing section. In this case, the function field of the transmission data group specifies that the data of the data field data for voice wireless communication is voice data, and the unique data and voice data of the called vehicle terminal to be called are included in the transmission data group. Is inserted.

Accordingly, continuous voice communication is performed between the calling party and the called party.

The following describes the inter-vehicle short-range wireless communication procedure by the device configuration of the present invention described above.

3 is a flowchart illustrating a wireless communication procedure between vehicles in an intelligent traffic network system according to the present invention, FIG. 3A is a flowchart illustrating a reception procedure, and FIG. 3B is a flowchart illustrating a transmission procedure.

In the inter-vehicle wireless communication, the reception procedure analyzes a preamble and a sync field when a stream of data is received from a roadside base station at a called vehicle terminal waiting to receive (S1, S2). S3).

As described above, the calling party's unique number and the called party's unique number are inserted into the preamble, and data group length information is inserted.

Therefore, the called vehicle terminal checks the unique numbers inserted in the preamble and then checks whether the synchronization is correct using the synchronization code inserted in the synchronization field (S4).

At this time, the called vehicle terminal remains in a waiting state for reception if the called party's unique number of the received data group is not its own number or its own number is not accurate.

On the other hand, if the called party's unique number of the received data group is its own number and the synchronization is correct, then the function field is analyzed (S5).

Since the functional field is a field that defines the nature of the data inserted into the data field (data), the analysis result shows whether the currently received data group is for voice communication.

Thereafter, the called party can know whether it is called through the analysis result displayed on the terminal, and the called party determines whether to receive voice data. If the called party selects to receive the voice data, the decoded voice is output to the speaker (S7, S8), but if the called party does not select to receive the voice data, it is ready to receive voice data again.

However, if the result of analyzing the function field is not the voice data reception, since the data inserted into the data field (data) is data for informing traffic information, the corresponding data is displayed on the screen and then the reception state is received (S9).

The following describes a transmission procedure in wireless communication between vehicles.

When the calling subscriber requests data transmission from the calling vehicle terminal waiting for reception (S10, S11), the calling vehicle terminal checks whether the current transmission request is a request to transmit voice data (S12).

Then, when the voice of the calling party is input through the microphone (S13), the input voice is encoded through a codec and converted into a digital signal (S14). The converted digital signal is composed of a data group including the calling party's unique number, called party's unique number and voice data (S15).

However, if the current transmission request is a data transmission request for informing traffic information, the traffic group of the current location is formed and then transmitted (S17).

Thereafter, the data group for transmission is transmitted from the calling vehicle terminal to the corresponding called vehicle terminal through the roadside base station (S16), and the calling vehicle terminal is in a reception standby state after transmitting the voice data (S10).

As described above, the present invention can service short-range voice wireless communication between a plurality of vehicles moving in a group.

At this time, since the minimum power is used for the communication between the terminals provided in the vehicle and the roadside base station, the transmission power of the vehicle terminal uses a low output for short distance (for example, about 200 m) communication.

Therefore, since the influence of interference on other communication systems is small when the destination moves to a group of the same multiple vehicles, it is possible to provide an optimal voice communication service between vehicles.

Claims (7)

In a traffic network system composed of at least one vehicle terminal and at least one roadside base station, based on information data transmission, Analyzing the characteristics of the data inputted to the calling vehicle terminal; When the voice data is input as a result of the analysis, the voice data encoding the calling party's voice, the calling party's unique number assigned to the calling vehicle terminal, the called party's unique number assigned to the called vehicle terminal, and synchronization Forming a data group of a predetermined length into which a synchronization code for the data is inserted and transmitting the same; And a step in which the called vehicle terminal receives and decodes the transmission data group and selectively outputs a corresponding voice. delete The method of claim 1, wherein the step of receiving the transmission data group, Identifying a calling party's unique number and called party's unique number inserted into the received data group; Synchronizing with the synchronization code inserted into the received data group; Decoding the voice data inserted into the data group when the unique number and the synchronization are correct; And outputting the decoded voice data through voice selection by a called subscriber. A duplexer for controlling the flow of the input / output received signal and the transmitted signal; A reception processor which processes the received signal in downlink frequency and outputs the voice; A transmission processor for uplink frequency processing of the subscriber's voice and transmitting the signal as a wireless signal; A codec for decoding the downlink frequency-processed digital signal in the reception processor and encoding the digital signal to be uplink-processed in the transmission processor; An inter-vehicle wireless communication device for transmitting and receiving data between vehicles and transmitting and receiving voice data, including a modem for transmitting and receiving data including voice data with a roadside base station. God device. delete [5] The intelligent transportation network of claim 4, wherein the roadside base station includes a wireless communication device for transmitting and receiving voice data having the same configuration as the wireless communication device between the vehicles, and a wired connection device for wired connection. Inter-vehicle wireless communication device in the system. delete