KR100598512B1 - How to Configure Link Data for Traffic Management Systems - Google Patents

Abstract

The present invention relates to a method for constructing link data for a traffic management system that enables link data to be constructed using such a road name when a road having a link with a plurality of nodes has a road name of a continuous link. Prepare numerical map information for any area to which traffic information is to be serviced; Store basic information about each road existing in any area and a pre-assigned road name with consecutive links for each road; Collecting traffic state information for a specific road included in the digital map information and for which current road traffic information is to be constructed, from a plurality of information providers; Traffic information data by constructing one N-bit link data having additional information link ID for a specific road based on the numerical map information, basic information of a specific road, road name previously assigned to a specific road, and collected traffic condition information. By suppressing the amount of generated as much as possible and reducing the traffic information data processing time at the receiving terminal, it is possible to implement high-speed processing of the real-time concept.

Description

How to Configure Link Data for Traffic Management Systems

The present invention relates to link data used in a traffic management system. More particularly, the present invention relates to link data required for constructing link data required for wireless service to a wide area user through a broadcasting network by constructing packet data of road network information for a traffic service. A link data configuration method for a traffic management system.

In recent years, various problems related to traffic problems such as traffic jams, traffic accidents, traffic environment, traffic services, etc., which are gradually increasing due to the rapid increase of driving vehicles caused by the increase of vehicle demand, have been solved all over the world. Various traffic countermeasures have been established, and in particular, as part of measures for safety of vehicle operation and traffic services, the emergence of traffic control systems using satellites, broadcasting networks or short-range wireless communication has been realized. In order to further enhance the service, technology development for the improvement of various transportation service quality is being actively conducted everywhere.

On the other hand, a communication system in a traffic system may be classified into, for example, wide-area two-way wireless communication, broadcast type wireless communication, and short-range wireless communication. In this case, wide-area two-way wireless communication may include, for example, a paging system, a satellite system, There are a wireless data communication system, various cellular systems, and the like. A broadcast type wireless communication is a method of transmitting packet data using, for example, an FM subcarrier of a broadcast signal, and short-range wireless communication is between a vehicle and a roadside or a vehicle. Communication between them. Here, the present invention relates to a broadcast type wireless communication scheme.

Here, broadcast wireless communication is a means of simultaneously delivering information required by a plurality of unspecified users distributed in a wide area. Such a broadcast wireless communication method may include, for example, a vertical blank section of a television. There are a method of using, a method of using a subchannel of an audio signal, a method of using an FM subcarrier, and the like, and a representative communication method that has been recently activated is an FM subcarrier method.

The FM subcarrier, which is representative of the broadcast type wireless communication method, transmits an auxiliary program or data using a subcarrier portion (for example, tens of KHz) except for a portion for transmitting a stereo signal. Traffic information constructed and packetized according to the present invention is also inserted into this subcarrier portion and transmitted.

Meanwhile, in the method of serving traffic information using a broadcasting network, information provided from information providers (IP) is collected at predetermined time units, the collected information is analyzed, and a long message obtained through such analysis. The traffic information of is divided into a plurality of packets (for example, a packet divided into hundreds of bytes) and transmitted. For this purpose, the server packetizes the analyzed traffic information into packet data having a predetermined length and transmits the data wirelessly or by wire. Through the transmission to the base station, that is, the broadcast station.

On the other hand, traffic information collected through a traffic management system and wirelessly serviced to a plurality of users using broadcast type wireless communication includes road information, traffic volume information, traffic accident situation information, and the like. IP traffic information is collected and analyzed, and then the improved method of constructing the analyzed road traffic information data for packetization.

In general, a road link means a topological representation of a road connecting an intersection point and an intersection point or an intersection point and an end point of a road, and so on, an intersection point or an end point is referred to as a node.

On the other hand, in the digital road map currently used, in the road information expression method, the attribute input in the form of a link has a method of inputting data on a single link. As an example, as shown in FIG. 5, when there are three roads with each node, each road is represented by a plurality of links and nodes, and each link and node is represented by a link number and a node number according to its numbering scheme. Are distinguished. As an example, as shown in Figure 5, road A is represented by four links (L1, L2, L3, L4) and three nodes (N1, N2, N3), and road B is four links (L9, L10). , L11, L12) and four nodes (N4, N5, N6, N7), road C has four links (L5, L6, L7, L8) and four nodes (N8, N9, N10, N11) It is expressed as That is, in the conventional method, at least 12 link data formats must be constructed when the road information data for FIGS. A, B, and C are to be constructed.

Thus, in such a link structure, when information is provided from information providers (IP), the server analyzes the traffic information (eg, road width or lane information, traffic direction information, lane information) for each link through information analysis. Traffic condition information (congestion, blending, smoothing, etc.) in one data format.

That is, the link data format is created by adding additional information according to traffic information analyzed together with the link identification code (that is, link ID) for each of the plurality of links existing on a single road, and the valid information including the link data created as described above. These packets are packetized into packets having a fixed length of N bytes together with packet header information, and then transmitted wirelessly or wired to a transmitting base station (eg, a broadcasting station).

However, as described above, a method of classifying a road into a link number system having a plurality of links and constructing traffic information data according to the above-described method requires unnecessarily a large amount of data of traffic information to be serviced (for example, FIG. In order to construct the traffic information on the road A shown in Fig. 5, all four link datas are required), which leads to an unnecessary increase in the amount of memory occupied on the server side.

In addition, considering the limited bandwidth, transmission speed, etc., a large amount of data to be transmitted may cause transmission delay, and at the receiving side (for example, a dedicated terminal, a laptop computer, a vehicle navigation system, etc.), decoding may be performed. Due to the delay of the processing time required for signal processing, there is a problem that it may cause difficulty in real time processing.

Accordingly, the present invention is to solve the above-mentioned problems of the prior art, the traffic management that can build the link data by using the road name when the road having a link with a plurality of nodes has a road name of a continuous link The purpose is to provide a link data configuration method for the system.

In order to achieve the above object, according to the present invention, the traffic information of the specific road is converted into an N-bit link data format based on the traffic condition information of the specific road having a plurality of links and nodes and the numerical map information including the specific road. The link data of each road in a traffic management system for constructing and dividing the link data thus constructed into packet units having a predetermined length including header information and loading the divided packet unit data in a predetermined area of a broadcast signal. A method of constructing a method, the method comprising: preparing digital map information of an arbitrary area for which the traffic information is to be serviced; Storing basic information on each road existing in the predetermined area and a pre-allocated road name in a continuous link for each road; Collecting traffic state information on the specific road included in the digital map information and to which current road traffic information is to be constructed, from a plurality of information providers; And one N-bit link data having additional information link ID for the specific road based on the numerical map information, the basic information of the specific road, the road name previously assigned to the specific road, and the collected traffic condition information. Provided is a link data composition method for a traffic management system.

The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

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

The core technical gist of the present invention is a continuous link to a road to which link data is to be constructed, unlike the above-described prior art which classifies one road into a link number system having a plurality of links and constructs traffic information data accordingly. Traffic information data to be obtained in the present invention through such technical means by constructing link data for the road based on one link information corresponding to the road name and node information existing on the road when the road name exists. The suppression of the amount of generated can be realized.

As an example, assuming a link number system as shown in FIG. 3, the present invention classifies the number system by classifying the additional information link ID and the sub link ID according to a link having a road name or a road type having continuity. Have That is, assuming that the road name of the road A is a ring road, the road name of the road B is the riverside street, and the road name of the road C is the Olympic street, each road is a numbering system classified into one additional information link ID and a sub link number. Has

That is, road traffic information (e.g., road width or lane information, traffic direction information, lane information, traffic status information (congestion, mixed, smooth, etc.) for each of A, B, and C roads having respective road names) In the present invention, when constructing the link data and constructing it as link data, only three link data can be constructed and realized.

1 shows a schematic diagram of an exemplary broadcast type wireless communication system suitable for performing a traffic service using link data for a traffic management system constructed in accordance with a preferred embodiment of the present invention.

As shown in the diagram, the broadcast type wireless communication system includes a plurality of information parks (IPs) 102/1-102 / n, information collectors 104, servers 106, broadcast stations 108, and moving objects. 110.

Referring to FIG. 1, information parks (IPs) join a company (or broadcaster) as a number of direct traffic information communicators, traffic correspondents belonging to the company (or broadcaster), for example, for service of traffic information. It may consist of a number of indirect traffic information communicators (eg, taxi drivers, etc.) or any indirect traffic information communicators who are not subscribed, each of which may be periodic using a telephone, a laptop computer, or the like. Or from time to time provides traffic information (for example, traffic situation information such as congestion, mixing, smoothness, etc.) for the road that is currently located to the information collector 104.

In addition, the information collector 104 collects traffic information provided from each of the plurality of information parks (IPs), classifies and collects the collected traffic information and provides it to the server 106, for example, collected The information is collected and converted into a digital signal, and the converted digital traffic information is provided to the server 106 by wire or wirelessly.

On the other hand, the server 106 is a part directly related to the present invention, and the packetizing of the traffic information data to monitor the traffic information of the entire area, traffic management, system operation, analysis and storage of the collected data, and to transmit the traffic information. Etc., the specific signal processing procedure in this server 106 will be described later in detail with reference to the accompanying FIG.

On the other hand, the broadcasting station 108 transmits the packetized traffic information provided from the server 106 to a broadcast signal to be transmitted and transmits it to an unspecified number of users through an antenna, whereby the communication scheme For example, there is a method of using a vertical blank section of a television, a method of using a subchannel of an audio signal, a method of using an FM subcarrier, and the like, and a representative communication method that has recently been activated is an FM subcarrier method. Can be mentioned.

At this time, the method using the FM subcarrier, which is representative of the broadcast type wireless communication method, transmits an auxiliary program or data using a subcarrier portion (for example, several tens of KHz) except for a portion for transmitting a stereo signal. Traffic information packetized and packetized according to the present invention may also be inserted into this subcarrier portion and transmitted.

In addition, the movable body 110 is, for example, a car running on a specific road, and these cars are provided with a receiver having a map information database DB, that is, a dedicated terminal or a notebook computer. Therefore, the receiver separates the traffic information mixed with the broadcast signal, analyzes the separated traffic information, and adds the received traffic information on the numerical map provided from the map information database prepared based on the analysis result. Information will be displayed on a monitor not shown. At this time, the current traffic condition information for a particular road may be voice serviced through a speaker as well as a monitor.

Thus, drivers will be able to recognize current traffic information for a particular road provided through a monitor or speaker.

2 shows a block diagram of a server side control system constituting link data for a traffic management system according to the present invention.

As shown in the figure, the server-side control system includes an input buffer 202, a memory 204, a control block 206, a map information database (DB) 208, a traffic information database (DB) 210 ), A packetizer 212 and a modulation block 214.

Referring to FIG. 2, in the input buffer 202, traffic such as traffic situation information from a plurality of information parks IP of FIG. 1, for example, traffic situation information such as congestion, mixing, and smoothness on a specific road, may be used. Context information is buffered and provided to the memory 204. The memory 204 stores the traffic state information data received through the input buffer 202 according to the control from the control block 206 to be described later, and stores the stored traffic condition information data for the construction of the link data. To the control block 206.

In addition, the map information database 208 stores numerical map information for a wide area currently set as a traffic information serviceable area, and the numerical map information stored therein is necessary for constructing link data of a specific road, which will be described later. Provided to the control block 206 as source information.

Meanwhile, the traffic information database 210 includes basic information about various roads in a predetermined traffic information providing area, such as road width or lane information, traffic direction information (two-way traffic link or one-way traffic link), lane information, and the like. The basic information of is stored, and when the link data for a particular road is constructed according to the present invention, the link data to be constructed is stored.

On the other hand, in the control block 206, the basic information of the numerical map information provided from the map information database 208, the corresponding road provided from the traffic information database 210 (that is, the road to which the traffic information is to be built), For example, on the basis of traffic width information (e.g., congestion, blending, smoothing, etc.) for a particular road provided from the memory 204, the road name of a continuous link is determined. Construct road traffic information link data of a particular road, i.e., as shown in FIG. 4 as an example, each octet is 8 bits for each particular road (i.e. road A, B or C in FIG. 3) having a road name. Link data having a total information length of 8 octets (D1-D8) (that is, 64 bits) is constructed.

Referring to FIG. 4, in link data of a specific road having a road name constructed according to the present invention, oct 1 (D1) includes link information of 4 bits and road class classification information of 4 bits. The level information is the maximum wide area information in consideration of the display level of the dedicated terminal mounted on the vehicle, the vehicle navigation system, etc., and the road class classification information is, for example, a highway, a national road, a local road, a main trunk road (for example, Urban express roads, highways, ring roads, Olympic boulevards, riverside roads, industrial roads, and the like.

In addition, octet 2 (D2) includes two bits of road width (or lane) classification information, two bits of traffic information, each bit of link direction information and lane presence information, two bits of distance unit information, At this time, the road width classification information indicates the driver of the corresponding road, and such a player is, for example, 3-5.5m = 1st lane, 5.5-13m = 2-3rd lane, 13-25m = 4-8th lane, and more than 24m = 8th order. In addition, traffic information of octet 2 indicates congestion, congestion, or desire of the corresponding road (ie, link), link direction information indicates a two-way traffic link or a one-way traffic link, and distance unit information indicates a road (or link). As distance unit, distance information, such as 10m, 100m, 1Km, is shown, for example.

On the other hand, oct 3 (D3) is the leaf number of the road, such a leaf number, for example, can use the leaf management number system of the National Geographic Institute input window, octets 4 and 5 (D4-D5) is added to the 16-bit As the information link ID information, the serial number of the road link having a unique road name (eg, a ring road, an Olympic street, etc.) in a single leaf is indicated.

In addition, oct 6 (D6) represents the length of the side information link, oct 7 (D6) represents the number of the sub link, wherein the side information link is composed of the serial number of these sub links. And oct 8 (D8) shows the length of the sub link.

At this time, of the information included in the link data as described above except for the two-bit traffic information included in the octet 2 (D2) is stored in the traffic information database 210 of FIG. In addition, such basic information may be stored in a database by the control system operator.

Therefore, in the control block 206, the basic information (eg, the road to which the traffic information is to be constructed) of the numerical map information provided from the map information database 208 and the corresponding road provided from the traffic information database 210 (eg For example, the road traffic information link data of a specific road is constructed based on the traffic information such as road width or lane information, and traffic information such as traffic congestion, mixing, and smoothness provided from the memory 204. The data is provided to the packetizer 212.

Meanwhile, the packetizer 212 packetizes the link data for the specific road provided from the control block 206 in packet units having a predetermined length including header information such as a start point and an end point. The packetized link data is modulated into a wired or wireless transmittable signal through the modulation block 214 and then transmitted to the broadcast station 108 of FIG. 1, that is, the transmitting base station.

Accordingly, the broadcasting station 108 of FIG. 1 mixes link data received via wire or wirelessly with a broadcast signal to be transmitted, and transmits the radio to an unspecified number of users through an antenna, for example, a vertical blank section of a television and an audio signal. It will be inserted into the subchannel, FM subcarrier and so on.

As described above, according to the present invention, when there is a road name of consecutive links in the road on which the link data is to be constructed, one link information corresponding to the road name and one node for the road based on node information existing on the road. By constructing the link data, the amount of traffic information data can be suppressed as much as possible, and the high speed processing of the real time concept can be realized by reducing the traffic information data processing time at the receiving terminal (or laptop computer, vehicle navigation system, etc.). Can be.

1 is a schematic diagram of an exemplary broadcast type wireless communication system suitable for performing a traffic service using link data for a traffic management system constructed in accordance with a preferred embodiment of the present invention;

2 is a block diagram of a server-side control system for establishing link data for a traffic management system according to the present invention;

3 is a diagram illustrating an example of an additional information link number system configured according to the present invention;

4 is a diagram showing an example of a link data structure constituted according to the present invention;

FIG. 5 is a diagram illustrating an example of an additional information link number system configured in a conventional manner. FIG.

<Description of the code | symbol about the principal part of drawing>

102/1-102 / n: Information Park (IP) 104: Information collector

106: server 108: broadcasting station

110: mobile body 202: input buffer

204: memory 206: control block

208: Map information DB 210: Traffic information DB

212 modulation block

Claims (3)

Based on the traffic state information of a specific road having a plurality of links and nodes and the numerical map information including the specific road, the traffic information of the specific road is constructed in an N-bit link data format, and the link data thus constructed is headered. A method of configuring link data of each road in a traffic management system for dividing a packet unit having a predetermined length including information into a packet unit and transmitting the divided packet unit data to a predetermined area of a broadcast signal, the method comprising: Preparing numerical map information of any area for which the traffic information is to be serviced; Storing basic information on each road existing in the predetermined area and a pre-allocated road name in a continuous link for each road; Collecting traffic state information on the specific road included in the digital map information and to which current road traffic information is to be constructed, from a plurality of information providers; And Build one N-bit link data having additional information link ID for the specific road based on the numerical map information, basic information of the specific road, road name previously assigned to the specific road, and the collected traffic condition information. The process of doing And said additional information link ID is composed of a serial number of sub links having a unique road name in a single leaf. The link data structure of claim 1, wherein the basic information about each road includes road class classification information, road width classification information, traffic direction information, lane length information, and link length information. Way. The method of claim 1, wherein the traffic state information for the specific road is information indicating a congestion state, a mixed state, or a desired state of the specific road.

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