KR20040085357A - Method to improve section speed gathering process of DSRC - Google Patents

Abstract

PURPOSE: A method for collecting speed information per section of a dedicated short range communication is provided to collect speed information per section from information received by a present road side unit and distance between road side units and data base, without storing the previous information of an on-board unit or scanning them. CONSTITUTION: An on-board unit(20) meets the first road side equipment R1(10) and receives a road side equipment ID and a passing time, and meets the second road side equipment R2(30) and transmits the road side equipment ID and the passing time of the first road side equipment R1 and an on-board unit ID to the second road side equipment R2. The second road side equipment R2 transmits R1_ID, R1_passing time, R2_ID, R2_passing time and the on-board unit ID to a traffic information server(40). Then, the traffic information server calculates the time for the on-board unit to pass a period(R1-R2) with the R1_passing time and the R2_passing time, and calculates speed information of the period(R1-R2) by scanning a section distance from the road side equipment distance_database.

Description

Method for collecting section speed information of short-range wireless communication {Method to improve section speed gathering process of DSRC}

The present invention relates to a method for collecting speed information for each section of Dedicated Short Range Communication (DSRC) and a computer-readable recording medium recording a program for realizing the method, in particular, an intelligent transportation system (ITS) Computer-readable record that records the speed information for each section of short-range wireless communication and the program for realizing the above method for collecting speed information for each section between roadside base station and roadside base station using short-range wireless communication in Transport System It is about the medium.

In general, short-range dedicated communication (DSRC) refers to a roadside unit (RSU: Roadside Base Station) in the technology of intelligent transportation systems and a short-range wireless communication device in a vehicle that is rapidly progressing. Through the two-way communication within the short distance (within 100m) communication radius (hereinafter referred to as OBU: On Board Unit) to build an efficient advanced road traffic environment through automatic toll collection, road traffic safety information, etc. This means dedicated communication between vehicle and roadside devices, which is used to promote traffic efficiency and cost reduction. It is already installed and used in Europe, Europe and Western countries, Malaysia, Singapore, etc., and research is being actively conducted in Korea.

In short-range wireless communication (DSRC), the communication area of a roadside base station is relatively small compared to base stations of wide area wireless communication networks (cellular, PCS, IMT-2000, etc.). In addition, while the wide area wireless network guarantees continuity of communication such as handover, the short range wireless communication (DSRC) does not support handover in a spot type communication method. In addition, since the short-range wireless communication (DSRC) targets a vehicle moving at a high speed, the communication time between the vehicle-mounted device and the roadside base station is very limited.

Therefore, when the vehicle-mounted device requests information to the center server through the roadside base station, it is likely that information reception is impossible in the communication area of the same roadside base station due to the processing time and transmission time of the server.

That is, short-range wireless communication (DSRC) is installed in a specific area and has a feature that the communication area is limited to a short distance. In addition to the advantage of knowing the current location has the advantage that can provide the most suitable information to the current location mainly in the form of a broadcast. However, the driver request service requiring a long processing time is very likely to leave the communication area without receiving the service because of the short communication time due to the narrow speed of the vehicle and the communication area.

In short-range wireless communication (DSRC), the speed information for each section is calculated.The traffic information server collects the time when the vehicle-mounted device passes the specific point (the location of the roadside base station) through the roadside base station, and saves it in the distance between the roadside base stations_database. By searching the distance information between the roadside base station and the roadside base station, it is possible to calculate the speed information for each point and the section between points. The amount of calculation can be drastically reduced according to the information content collected.

The existing collection method transmits only the vehicle loading device ID without telling the roadside base station the current roadside station ID and passing time (passing time). Only base station ID and current pass time will be received. Therefore, the traffic information server must store the received information in the previous vehicle_database, and each time the vehicle-mounted device moves and passes through the other roadside base station, the same vehicle-mounted device from the previous vehicle_database previously needs to select a roadside station. There is a problem in that a large amount of computation is consumed as a method of calculating the speed information for each section by searching the distance information between the roadside base station and the roadside base station previously stored in the database.

The present invention has been proposed in order to solve the above problems, by having the vehicle mounting apparatus transmits the old roadside base station ID (ID) and the old roadside station passing time (passing time) to the current roadside base station, traffic information server Section of short-range wireless communication to collect speed information for each section from information received from current roadside base station and distance between roadside base station_database without the need for vehicle loading device to store or retrieve previously passed information in previous vehicle_database. It is an object of the present invention to provide a method for collecting star speed information and a computer-readable recording medium recording a program for realizing the method.

1 is an exemplary configuration of a speed information collection system for each section of the short-range wireless communication to which the present invention is applied.

Figure 2 is an exemplary data communication between the speed information acquisition system for each section of the short-range wireless communication according to the present invention.

3 is a flowchart illustrating a method for collecting speed information for each section of short-range wireless communication according to the present invention.

* Explanation of symbols for the main parts of the drawings

10: first roadside base station 20: vehicle loading device

30: second roadside base station 40: traffic information server

In accordance with an aspect of the present invention, there is provided a method for collecting speed information for each section of short-range wireless communication, wherein the first roadside base station ID (R1_ID) and the first roadside base station are provided to a vehicle-mounted device entering a communication area of the first roadside base station. Transmitting a passing time (R1_passing time) so that the vehicle mounting apparatus stores the R1_ID and the R1_passing time; And receiving the R1_ID, the R1_ passing time, and the vehicle loading device ID from the vehicle loading device in which the second roadside base station currently enters its communication area, and receives a second roadside station ID (R2_ID) and a second roadside station. And a second step of transmitting the distance information R2_ID to the traffic information server to search the distance between the first and second roadside base stations in the traffic information server to calculate speed information of the section. do.

In addition, the present invention, in the method for collecting the speed information for each section of short-range wireless communication, the traffic information server from the current roadside base station (R1_ID), the old roadside station passing time (R1_passing time), the current roadside station A first step of receiving ID (R2_ID), current roadside station passing time (R2_ID), and vehicle-mounted device ID information; A second step of retrieving distance information between the previous roadside base station and the current roadside base station from a distance between a base station base station_database using the R1_ID and the R2_ID received through the first step; And a third step of calculating a travel time between the previous roadside base station and the current roadside base station according to the search result of the second step, and calculating speed information of the section based on the retrieved distance information. It features.

In addition, the present invention, in the method for collecting the speed information for each section of the short-range wireless communication, the first roadside base station ID (R1_ID) and the first roadside station passing time (R1) to the vehicle-mounted device entering the communication area of the first roadside base station; A first step of transmitting a passing time); A second step of the vehicle-mounted device receiving the R1_ID and the R1_pass time and storing them in a memory; A third step of the vehicle-mounted device entering the communication area of the second roadside base station transmitting the R1_ID, the R1_pass time, and the vehicle-mounted device ID to the second roadside base station; The R1_ID, the R1_ passing time and the second roadside station ID (R2_ID), the second roadside station passing time (R2_ID), and the vehicle loading device ID are transmitted by the second roadside base station. Transmitting to the fourth step; And the traffic information server receives the R1_ID, the R1_pass time, the R2_ID, the R2_ pass time, and the vehicle-mounted device ID information, and the first roadside base station and the second roadside from a roadside base station distance database. And a fifth step of calculating the speed information of the section by searching the distance between the base stations.

In addition, the present invention provides a first roadside base station ID (R1_ID) and a first roadside station passing time (R1) to a vehicle-mounted device entering a communication area of a first roadside base station in a short-range wireless communication (DSRC) network having a processor. _ Passing time), so that the vehicle-mounted device stores the R1_ID and the R1_ passing time; And receiving the R1_ID, the R1_ passing time, and the vehicle loading device ID from the vehicle loading device in which the second roadside base station currently enters its communication area, and receives a second roadside station ID (R2_ID) and a second roadside station. A program for realizing a second function of transmitting the distance information R2_ID to the traffic information server so that the traffic information server retrieves the distance between the first and second roadside base stations and calculates the speed information of the section. Provide a computer readable recording medium.

In addition, the present invention, in the short-range wireless communication (DSRC) network having a processor, the traffic information server from the current roadside base station ID (R1_ID), the old roadside station passing time (R1_passing time), the current roadside station A first function of receiving ID (R2_ID), current roadside station passing time (R2_ID), and vehicle-mounted device ID information; A second function of retrieving distance information between the previous roadside base station and the current roadside base station from a distance between a base station base station_database using the R1_ID and the R2_ID received through the first step; And calculating a travel time between the previous roadside base station and the current roadside base station according to the search result of the second step, and calculating the speed information of the section based on the retrieved distance information. Provide a computer readable recording medium having recorded thereon.

In addition, the present invention, the first roadside base station ID (R1_ID) and the first roadside station passing time (R1) to the vehicle-mounted device entered the communication area of the first roadside base station in a short-range wireless communication (DSRC) network having a processor; _ First time of transmission); A second function of the vehicle-mounted device receiving the R1_ID and the R1_pass time and storing them in a memory; A third function of transmitting the R1_ID, the R1_ passing time, and the vehicle loading device ID to the second roadside base station by the vehicle loading apparatus entering the communication area of the second roadside base station; The R1_ID, the R1_ passing time and the second roadside station ID (R2_ID), the second roadside station passing time (R2_ID), and the vehicle loading device ID are transmitted by the second roadside base station. A fourth function of transmitting to; And the traffic information server receives the R1_ID, the R1_pass time, the R2_ID, the R2_ pass time, and the vehicle-mounted device ID information, and the first roadside base station and the second roadside from a roadside base station distance database. A computer-readable recording medium having recorded thereon a program for realizing a fifth function of searching a distance between base stations and calculating speed information of the interval is provided.

According to the present invention, when a vehicle loading apparatus passes through a roadside base station, it receives a roadside base station ID and a passing time, stores it in a memory, and when the vehicle loading station encounters a new roadside station, the old roadside station ID, a passing time, and a vehicle loading device ID are stored. Send it to the roadside base station. The roadside base station transmits the old roadside station ID, the old roadside station passing time, the current roadside station ID, the current roadside station passing time, and the vehicle loading device ID to which the vehicle loading device has passed. The traffic information server receiving the traffic information retrieves the distance information between the roadside base station (formerly roadside base station) and the roadside base station (current roadside base station) stored in the distance between roadside base stations_database and calculates the speed information of the section. In this process, the traffic information server does not store or retrieve previous information passed by the on-vehicle device, thereby providing an economical traffic information service.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exemplary configuration diagram of a system for collecting speed information for each section of short-range wireless communication to which the present invention is applied.

As shown in FIG. 1, the on-vehicle device 20 that has started driving from the starting point meets the first roadside base station R1 10, receives the roadside base station ID and passing time, and continues to drive the second roadside station R2 30. The base station ID, passing time, and vehicle loading device ID of the first roadside base station R1 (10) previously passed are transmitted to the second roadside base station R2 (30).

Then, the second roadside base station R2 (30) transmits R1_ID, R1_ passing time, R2_ID, R2_ passing time, vehicle loading device ID to the traffic information server 40, and receives the traffic information server 40 R1_ With the passing time and R2_passing time, the vehicle loading apparatus 20 calculates the time required for the section [R1 ~ R2] to pass through, and searches the section distance from the roadside base station distance_database to determine the speed of the section [R1 ~ R2]. Calculate the information. The vehicle will pass through roadside base stations R3 and R4 while driving, and the above process is repeated, and the traffic information server 40 calculates speed information between roadside base stations.

Therefore, when the vehicles equipped with the vehicle-mounted device 20 pass a lot, the speed information of each section takes an average value, thereby obtaining reliable speed information.

2 is a diagram illustrating data communication between speed information collecting systems for each section of short-range wireless communication according to the present invention.

As shown in Fig. 2, when the on-vehicle device is turned on at the starting point, the roadside base station ID and the passing time information of the memory are initialized to null values. When the on-vehicle device 20 of the vehicle which has started driving meets the first roadside station R1 (10), it transmits the vehicle-mounted device ID (OBE1) and there is no previously passed roadside station. Null) and previous pass time information are transmitted, and the roadside station ID (R1) and the pass time (12:00:00 seconds) are received and stored in the memory.

The roadside base station R1 (10) transmits to the traffic information server 40 the previous roadside base station ID (Null), the previous roadside base station pass time (Null), the current roadside base station ID (R1), and the current roadside base station pass time (12:00) Second), the vehicle mounting apparatus ID is transmitted, but the traffic information server 40 ignores all of the received information values because it is null.

When the vehicle proceeds and the vehicle mounting apparatus 20 meets the second roadside station R2 (30), the vehicle loading unit ID (OBE1) is transmitted and received from the previously passed roadside station R1 (10) and stored in memory. It transmits the roadside base station ID (Rl) and the previous passing time (12:00:00 seconds) information, and receives the roadside station ID (R2) and the passing time (12:05:30 seconds) and stores it in the memory.

The roadside base station R2 (30) transmits the old roadside base station ID (R1), the old roadside station passing time (12:00:00), the current roadside station ID (R2), and the current roadside station passing time to the traffic information server 40 ( 12:05:30), the vehicle ID device is transmitted, and the traffic information server 40 has a R1_pass time (12:00:00 seconds) and R2_ pass time (12:05:30 seconds) The vehicle-mounted device calculates the time required (5:30 seconds) for passing the sections [R1 to R2], and retrieves the section distance from the roadside base station distance_database to calculate the speed information of the sections [R1 to R2].

3 is a flowchart illustrating a method for collecting speed information for each section of short-range wireless communication according to the present invention. The key procedure of the method for collecting speed information for each section is briefly described based on the second roadside base station R2 (30). .

As shown in FIG. 3, the vehicle starts to travel from the starting point, and the vehicle-mounted device 20 meets the first roadside base station R1 10 to receive the ID of the R1 10 and the R1 10 passing time to the memory. Store (301,302). In progress, the vehicle mounting apparatus 20 meets the second roadside base station R2 30 to transmit the vehicle mounting apparatus ID and transmits the R1_ID and the R1_ passing time stored in the memory (303).

The second roadside station R2 30 transmits the vehicle loading device ID, R1_ID, R1_passing time, R2_ID, R2_passing time to the traffic information server 40 (where the vehicle loading device ID is used for the vehicle location tracking service). Information, regardless of the section speed information calculation of the present invention) (304).

The traffic information server 40 calculates the time required for the vehicle-mounted device 20 to travel the sections [R1 to R2] with the R1_pass time and R2_pass time, and retrieves the distance from the roadside station distance_database. By calculating the speed information of the section [R1 ~ R2] (305).

The method of the present invention as described above may be implemented as a program and stored in a computer-readable recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.).

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

The present invention as described above, in the traffic information service to identify and provide the traffic information of the road, it is possible to provide a high-quality traffic information service through the rapid calculation by greatly simplifying the section speed information collection procedure, As the calculation amount is reduced, the economical effect can be obtained by constructing the traffic information system with a cheaper server.

Claims (10)

In the method of collecting speed information for each section of short-range wireless communication, Transmitting the first roadside station ID (R1_ID) and the first roadside station passing time (R1_passing time) to the vehicle-mounted device entering the communication area of the first roadside base station, the vehicle-mounted device sends the R1_ID and the R1_ A first step of storing a passing time; And The second roadside base station receives the R1_ID, the R1_ passing time, and the vehicle loading device ID from the vehicle loading apparatus currently entering its communication area, and passes through the second roadside station ID R2_ID and the second roadside base station. A second step of transmitting the time information R2_ID to the traffic information server so that the traffic information server retrieves the distance between the first and second roadside base stations and calculates speed information of the section; Speed information collection method for each section of the short-range wireless communication including a. The method of claim 1, The traffic information server, The R1_ID, the R1_ passing time and the R2_ID, the R2_ passing time, and the vehicle loading device ID information are received, and the distance between the first roadside base station and the second roadside base station is searched from a distance between roadside base stations. Speed information collection method for each section of the short-range wireless communication, characterized in that for calculating the speed information of the section. In the method of collecting speed information for each section of short-range wireless communication, The traffic information server is sent from the current roadside base station to the previous roadside station ID (R1_ID), the previous roadside station station passing time (R1_passing time), the current roadside station ID (R2_ID), the current roadside station station passing time (R2_ID), vehicle loading device ID information. Receiving a first step; A second step of retrieving distance information between the previous roadside base station and the current roadside base station from a distance between a base station base station_database using the R1_ID and the R2_ID received through the first step; And A third step of calculating a travel time between the previous roadside base station and the current roadside base station according to the search result of the second step, and calculating speed information of the section based on the searched distance information; Speed information collection method for each section of the short-range wireless communication including a. The method of claim 3, wherein The current roadside base station, The R1_ID, the R1_ passing time, and the vehicle loading device ID are received from the vehicle mounting apparatus currently entering the communication area, and transmitted together with the R2_ID and the R2_ID to a traffic information server, and the current communication area is entered. And transmitting the R2_ID and the R2_pass time to the vehicle-mounted device so that the vehicle-mounted device stores the R2_ID and the R2_pass time. In the method of collecting speed information for each section of short-range wireless communication, A first step of transmitting a first roadside station ID (R1_ID) and a first roadside station passing time (R1_passing time) to the vehicle-mounted device entering the communication area of the first roadside base station; A second step of the vehicle-mounted device receiving the R1_ID and the R1_pass time and storing them in a memory; A third step of the vehicle-mounted device entering the communication area of the second roadside base station transmitting the R1_ID, the R1_pass time, and the vehicle-mounted device ID to the second roadside base station; The R1_ID, the R1_ passing time and the second roadside station ID (R2_ID), the second roadside station passing time (R2_ID), and the vehicle loading device ID are transmitted by the second roadside base station. Transmitting to the fourth step; And The traffic information server receives the R1_ID, the R1_ passing time, the R2_ID, the R2_ passing time, and the vehicle loading device ID information, and the first roadside base station and the second roadside base station from a roadside base station distance database. The fifth step of calculating the speed information of the section by searching the distance between Speed information collection method for each section of the short-range wireless communication including a. The method according to any one of claims 1 to 5, The roadside base station, respectively, Installed on the roadside, the current roadside station ID (R2_ID) and the passing time (R2_passing time) are transmitted to the vehicle-mounted device entering the communication area, and the previous roadside station ID (R1_ID), which the vehicle-mounted device passed, Short-range radio, characterized by transmitting the roadside station passing time (the R1_ passing time), the current roadside station ID (R2_ID) and the current roadside station passing time (R2_passing time), vehicle loading device ID to the traffic information server. Method of collecting speed information for each section of communication. The method of claim 6, The vehicle mounting apparatus, It stores the old roadside station ID (R1_ID), the old roadside station passing time (R1_passing time), and when entering a new roadside station, the old roadside station ID (R1_ID), the old roadside station passing time (R1_passing time) Method of collecting speed information for each section of the short-range wireless communication, characterized in that for transmitting to the new roadside station with the vehicle ID. In short-range wireless communications (DSRC) networks with processors, Transmitting the first roadside station ID (R1_ID) and the first roadside station passing time (R1_passing time) to the vehicle-mounted device entering the communication area of the first roadside base station, the vehicle-mounted device sends the R1_ID and the R1_ A first function of storing a passing time; And The second roadside base station receives the R1_ID, the R1_ passing time, and the vehicle loading device ID from the vehicle loading apparatus currently entering its communication area, and passes through the second roadside station ID R2_ID and the second roadside base station. A second function of transmitting the time information R2_ID to the traffic information server so that the traffic information server retrieves the distance between the first and second roadside base stations and calculates speed information of the section; A computer-readable recording medium having recorded thereon a program for realizing this. In short-range wireless communications (DSRC) networks with processors, The traffic information server is sent from the current roadside base station to the previous roadside station ID (R1_ID), the previous roadside station station passing time (R1_passing time), the current roadside station ID (R2_ID), the current roadside station station passing time (R2_ID), vehicle loading device ID information. A first function of receiving; A second function of retrieving distance information between the previous roadside base station and the current roadside base station from a distance between a base station base station_database using the R1_ID and the R2_ID received through the first step; And A third function of calculating a travel time between the previous roadside base station and the current roadside base station according to the search result of the second step and calculating speed information of the section based on the searched distance information; A computer-readable recording medium having recorded thereon a program for realizing this. In short-range wireless communications (DSRC) networks with processors, A first function of transmitting a first roadside station ID (R1_ID) and a first roadside station passing time (R1_passing time) to a vehicle-mounted device entering the communication area of the first roadside base station; A second function of the vehicle-mounted device receiving the R1_ID and the R1_pass time and storing them in a memory; A third function of transmitting the R1_ID, the R1_ passing time, and the vehicle loading device ID to the second roadside base station by the vehicle loading apparatus entering the communication area of the second roadside base station; The R1_ID, the R1_ passing time and the second roadside station ID (R2_ID), the second roadside station passing time (R2_ID), and the vehicle loading device ID are transmitted by the second roadside base station. A fourth function of transmitting to; And The traffic information server receives the R1_ID, the R1_ passing time, the R2_ID, the R2_ passing time, and the vehicle loading device ID information, and the first roadside base station and the second roadside base station from a roadside base station distance database. A fifth function of calculating the speed information of the section by searching the distance between the sections; A computer-readable recording medium having recorded thereon a program for realizing this.