KR20000030513A - PCS based on Real-time Traffic Information Technology - Google Patents

Abstract

PURPOSE: A method for providing real-time traffic information using a mobile telephone is provided to obtain desired traffic information without data of a CD-ROM by using a traffic information transceiver and an electronic map clipping technique. CONSTITUTION: A method for providing real-time traffic information using a mobile telephone comprises an information storage method for storing a local information data within a navigation system equipped in an existing vehicle, to a server computer of a main center. A driver is connected with the server computer of the main center by using PCS data communication modem. In addition, the method comprises a map clipping technique for extracting only necessary information to reduce a communication cost.

Description

Real-time traffic information providing technology using mobile phone wireless communication {PCS based on Real-time Traffic Information Technology}

The present invention enables the driver to receive traffic information using the existing PCS data communication network without additional facility costs, and compresses and transmits traffic information data to reduce the transmission speed and the amount of data to provide traffic information in real time. It is about technology that can be.

The existing vehicle navigation system is a form of retrieving road map information from a CD-ROM storing local information data in a navigation system mounted on a vehicle. In this way, the CD-ROM needs to be maintained and updated at regular intervals, and such maintenance and updating does not represent road map information as real-time traffic information. In addition, since all drivers using the service use the same traffic information, there is a problem that the traffic flow is concentrated on a specific road. Therefore, the existing vehicle navigation apparatus does not utilize real-time traffic information, but only a route map is searched, and thus, a traffic flow control function is inferior.

Accordingly, Korean Patent Application No. 97-10966, when a driver wants to know local information that is not stored in his vehicle, aims to share the information with other vehicles in which local information is embedded. The search speed of other vehicles that provide information is reduced because it needs to search for other vehicles and receive information again. Therefore, in order to improve these problems, it is necessary to manage local information data and road situation information collected in real time in a central center and provide drivers with a route map suitable for road conditions. That is, when a driver requests a travel route for a specific destination, a technology for searching for a travel route in a center and transmitting electronic map data and voice information data to the driver in a short time is required.

An object of the present invention proposed to solve the above-mentioned shortcomings is a system configuration capable of storing traffic information and road maps collected in a central center and providing the driver with a shortest route to a desired destination in real time, and its In providing a method.

In other words, an object of the present invention is to store a system in which all information is stored in a central center and a driver can receive a shortest path electronic map and voice guidance information by inputting only a desired destination in a terminal device. To this end, it is necessary to solve the problems such as the server load in the central center and the decrease in the transmission speed of the communication network due to multiple accesses.

1 is a block diagram of a traffic information providing system using PCS communication according to the present invention

Fig. 2 is the name of each part of the data communication kit for PCS

3 is a method of connecting a data communication kit between a PCS and a terminal device;

4 is a system configuration diagram connecting a PCS and a terminal device

* Explanation of symbols for the main parts of the drawings

1: Road map information storing local information data

2: Server computer for central center

3: Data communication modem for transmitting and receiving information

4: Traffic information transmission and reception using public telephone network

5: Portable PCS Phone

6: Data Communication Kit for PCS

7: Terminal device for providing traffic information

In order to provide a road map indicating the shortest route to a destination desired by a driver, the type of information transmission medium and the amount of information transmitted are important factors. In order to simultaneously receive a plurality of users, a fast transmission speed is required.

In order to achieve the above object, a real-time traffic information providing apparatus using PCS communication includes a server computer for central center for storing, retrieving, and calculating local information data; 56K modem communication unit using a general telephone line for providing a road map and voice guidance information to the driver; PCS and PCS data modem communication unit for the driver to send and receive information; It is composed of a terminal device for providing information using a small notebook.

The present invention is characterized by a method of transmitting and receiving traffic information using a PCS data communication method widely used for communication with the central center, and a clipping technique for compressing road maps to reduce communication costs and speed up transmission. It is done. In addition, in order for the driver to recognize the information quickly, the road map is displayed on the LCD screen and the information is provided by voice.

An embodiment of the present invention will be described below.

When the driver turns on the terminal device, the PCS data modem connected to the terminal device via RS232C is connected to a telephone connected to the server computer of the central center. When connected to a center, enter the name of the current location you want. The inputted information is sent to the central center, and the central center server computer searches the shortest path by combining the real-time traffic information from the traffic information collecting vehicle equipped with the GPS (Global Positioning System) and the stored local data. Create an electronic map including the movement route. The generated electronic map compresses the information to be transmitted by clipping to a rectangular area of a certain size including a moving path in order to improve communication efficiency. The driver receives the compressed information from the center, stores it in the terminal device, and then disconnects the PCS data communication connection. Using the transmitted data, the terminal device converts the zooming, reducing, and rotating, and outputs it on the LCD screen so that the moving path can be easily recognized.

1. Traffic information transceiver

It uses PCS and PCS data modem as a device that transmits the desired destination to the central center or transmits map and voice information from the central center to the driver. The driver makes a phone call to the central center using a PCS data modem connected to the terminal device via RS232C to connect one-to-one communication lines.

The driver enters the current location and the desired destination and transmits it to the central center through the connected one-to-one communication line. The central center receives the driver's current location and desired destination using a one-to-one modem connected to the driver. After calculating the movement route and the voice guidance information based on the received information, the information is transmitted to the driver again.

2. Electronic Map Clipping Technology

In order for a large number of users to receive the movement route from the center to the destination, the communication speed and the amount of transmission data become a problem. In order to reduce the communication cost incurred during data transmission and reception, it is necessary to reduce unnecessary information and to extract and transmit only necessary information. When the driver inputs the current location and the desired destination in the central center, the central center calculates the shortest time path using the stored area information data and extracts the data in the rectangular form only the area containing the shortest time path from the electronic map.

According to the present invention, the driver can receive the shortest distance map to the destination where the driver does not need a CD-ROM in which data is stored. Even if the regional information is changed, no additional cost is required because only the regional information data of the central center needs to be updated. In addition, when receiving the traffic information, it is possible to reduce the communication cost by compressing the electronic map displaying the movement route to improve the transmission speed. Since the PCS transmits and receives data with the center, the service can be provided without an additional communication device.

Claims (3)

An information storage method for storing local information data in a server computer of a central center in a navigation system mounted on an existing vehicle; An information transmission method using a PCS data communication modem for a driver to perform data communication with a computer of a center; Map Clipping technology for extracting only the necessary map information and removing unnecessary map information for transmission cost reduction;