JP2009093530A - Road communication system system, communication terminal, data reproduction processing method and program for data reproduction - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively reproduce specific information having high urgency. <P>SOLUTION: An onboard unit 200 determines whether or not data received from road-side radio equipment 100 are specific reception content data, and when determining that the received data are the specific reception content data, instructs a reproduction part to preferentially reproduce the specific reception content data, and determines whether or not a part of the specific reception content data has been received from the road side radio equipment 100, and when determining that a part of the specific reception content data has been received, compares the specific reception content data pattern recorded in the storage part of the onboard unit 200 in advance with the received data, and predicts the transmitted specific reception content data, and reproduces the predicted specific reception content data. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a road communication system, a communication terminal, a data reproduction processing method, and a data reproduction program.

  A system is known in which evacuation guidance information is transmitted to a vehicle-mounted device from a roadside wireless device installed along a road for a vehicle traveling on a toll road, etc., to safely guide and evacuate a passenger. (See Patent Document 1). In addition, ITS (Intelligent Transport System), which is a new transportation system for the purpose of solving road traffic problems such as traffic accidents, traffic jams, etc. by associating people, roads and vehicles using information communication technology, is being built in Japan. is there.

JP 2007-193650 A

  With the technique of Patent Document 1, the passenger can receive emergency facility information on the road in real time, so it is possible to evacuate calmly. However, it does not solve the following two important problems.

  The first problem is that Patent Document 1 does not notify the occupant of the occurrence of an event requiring evacuation, and the urgent button must be pressed when the occupant confirms the event. This is not safe enough for people who drive other vehicles.

  The second problem is as follows. In order to solve the first problem, it is assumed that a system has been constructed that enables an accident to be detected when another passenger car is on the road and notifies the other vehicle of the detected information. However, when such a system is constructed, when a plurality of received content data such as moving images, images, characters, and sounds are transmitted from the roadside apparatus as information to be reproduced simultaneously, reception of all the received content data is completed. Otherwise, the emergency information cannot be reproduced.

  For example, if the video, character information, and audio data of the emergency information are transmitted as received content data that should be reproduced at the same time, even if the reception of the audio data is completed, other character information, video data, etc. If the reception is not completed, the reproduction process cannot be performed. That is, the second problem is that only specific received content data and emergency information cannot be provided to the occupant.

  In the above-described ITS, it is said that notification is given so that traffic congestion information on an invisible curve ahead can be understood. If this is realized, the risk of a rear-end collision or the like is reduced, and the first problem described above can be solved to some extent. . However, there is no solution to the second problem described above.

  In order to solve such a problem, the present invention provides a road communication system that effectively reproduces transmission data sent from the roadside apparatus, for example, highly urgent specific information such as safe driving support information, An object is to provide a communication terminal, a data reproduction processing method, and a data reproduction program.

  In order to solve the above-described problems, the present invention provides a roadside radio device installed on a road side, an on-vehicle device that is mounted on a vehicle and receives and reproduces data transmitted from a communication unit of the roadside radio device, When the control unit of the vehicle-mounted device determines whether the data received from the roadside apparatus is specific received content data, and determines that the data is specific received content data And processing to instruct the playback unit to reproduce specific received content data preferentially, determine whether or not a part of the specific received content data has been received from the roadside apparatus, and determine that it has been received. In this case, the specific received content data transmitted by comparing the received data with the specific received content data pattern recorded in advance in the storage unit of the vehicle-mounted device Measurement to, and performs a process to reproduce a predicted specific received content data.

  Another invention is a road communication system comprising: a roadside radio device installed on a road side; and an on-vehicle device that is mounted on a vehicle and receives and reproduces data transmitted from a communication unit of the roadside radio device. The control unit of the vehicle-mounted device determines whether or not the data received from the roadside apparatus is specific received content data, and when it is determined that the data is specific received content data, the specific received content data is preferentially used. Is performed to instruct the playback unit to play back, and it is determined whether or not all of the data constituting the specific received content data has been received from the roadside wireless device, and it has been determined that all of the data has not been received. In this case, the received partial data is compared with the pattern of specific received content data recorded in advance, and the specific received content data transmitted from the comparison result is compared. I guess, and performs a process to reproduce the pattern of a particular received content data inferred.

  Yet another invention is a road communication system comprising a roadside radio device installed on the road side, and an onboard device that is mounted on a vehicle and receives and reproduces data transmitted from a communication unit of the roadside radio device. Then, the control unit of the vehicle-mounted device determines whether the data received from the roadside apparatus is specific received content data, and when it is determined that the data is specific received content data, the specific received content is preferentially used. In addition to performing processing to instruct the playback unit to play back data, the processing includes information that is highly urgent for safe driving out of a plurality of received content data received from the roadside wireless device, and urgent for safe driving. It is characterized in that the process of reproducing the received content data with priority over other low received content data is performed.

  Furthermore, in addition to the above-mentioned invention, the roadside wireless device includes a storage unit, a control unit, and a communication unit, and the vehicle-mounted device includes a storage unit, a control unit, a communication unit, and a playback unit, And an information providing server that provides a plurality of received content data to the device, and the control unit of the roadside wireless device records the plurality of received content data transmitted from the information providing server in the storage unit of the roadside wireless device. Means for dividing the received content data recorded in the storage unit of the roadside radio device into predetermined packet units, and means for giving header information to the data obtained by dividing the received content data. The communication unit includes means for transmitting the divided data to which the header information is added a plurality of times, and the control unit of the vehicle-mounted device re-transmits the divided data as received content data based on the header information. It means for forming, for the divided data and means for determining whether a particular received content data, characterized in that it comprises a means for reproduction processing of a particular received content data.

  Still another invention is a communication terminal having a storage unit, a control unit, a communication unit, and a playback unit, wherein the control unit of the communication terminal reconfigures received content data based on header information of the received divided data And means for determining whether or not the received data is specific received content data from the divided data, and means for instructing the playback unit to play back the specific received content data preferentially in the case of the specific received content data And (A) further comprising any one or more of the following (A) to (D), and (A) when it is determined that the divided data that is a part of the specific received content data has been received, A means for predicting specific received content data transmitted by comparing a pattern of specific received content data recorded in the storage unit with the received divided data; Means for instructing the playback unit to reproduce the specific received content data, and (B) when it is determined that all the divided data constituting the specific received content data has not been received, Means for comparing the patterns of the received specific received content data, means for estimating the specific received content data transmitted from the comparison result, and a playback unit for playing back the estimated specific received content data And (C) means for extracting a part from the received divided data when it is determined that all of the divided data constituting the specific received content data has not been received; Means for instructing the playback unit to play back, and (D) a part or all of the specific received content data Among the plurality of received content data received when it is determined that it has been received, specific received content data that is highly urgent for safe driving is played back to the playback unit with priority over other received content data that is urgent for safe driving Means for instructing to do so, and the reproducing unit includes means for reproducing information based on any one or a plurality of means (A) to (D).

  Still another invention is a data reproduction processing method used for a communication terminal having a storage unit and a reproduction unit, comprising reconfiguring received content data based on header information of received divided data, A step of determining whether or not the received content data is received, a step of instructing the playback unit to play back the specific received content data preferentially in the case of specific received content data, and the following (A ) To (D) have one or a plurality of steps, and (A) the identification recorded in advance in the storage unit when it is determined that the divided data that is a part of the specific received content data has been received A step of predicting specific received content data transmitted by comparing the received content data pattern with the received divided data. And the step of instructing the playback unit to play back the predicted specific received content data, and (B) if it is determined that all the divided data constituting the specific received content data could not be received. A step of comparing the divided data with a pattern of specific received content data recorded in advance, a step of estimating specific received content data transmitted from the comparison result, and reproducing the speculated specific received content data A step of instructing the playback unit to perform, and (C) extracting a part from the received divided data when it is determined that all of the divided data constituting the specific received content data has not been received, Instructing the playback unit to play back some data; and (D) a specific Among the plurality of received content data received when it is determined that part or all of the received content data has been received, specific received content data that is highly urgent for safe driving is other received content that is less urgent for safe driving A step of instructing the reproduction unit to reproduce the data prior to data, and the reproduction unit performing information reproduction processing based on any one or a plurality of steps (A) to (D). It is characterized by providing.

  Still another invention is a data reproduction program for causing a computer having a storage unit and a reproduction unit to function, wherein the received content data is reconstructed based on header information of the received divided data, and is specified from the divided data. Means for determining whether or not the received content data is received; means for instructing the playback unit to play back the specified received content data preferentially in the case of the specified received content data; Any one or a plurality of means of A) to (D), (A) When it is determined that the divided data that is a part of the specific received content data is received, the above-mentioned information recorded in the storage unit in advance The specific received content transmitted by comparing the pattern of the specific received content data with the received divided data A means for predicting data, a means for instructing the playback section to play back the predicted specific received content data, and (B) determining that all the divided data constituting the specific received content data have not been received. In this case, a means for comparing the received divided data and the pattern of the specific received content data recorded in advance, a means for estimating the specific received content data transmitted from the comparison result, Means for instructing the playback unit to play back the specific received content data; (C) if it is determined that all of the divided data constituting the specific received content data has not been received, Means for extracting a part, so that the extracted part of the data is reproduced in the reproducing unit; (D) the specific received content data that is highly urgent for safe driving among a plurality of received content data received when it is determined that part or all of the specific received content data has been received. Means for instructing the reproduction unit to reproduce the received content data that is less urgent for safe driving, and the reproduction unit sends one or more of (A) to (D) above The computer is caused to function as a means for reproducing the received content data specified based on the received content data.

  The present invention can provide a road communication system, a communication terminal, a data reproduction processing method, and a data reproduction program for effectively reproducing specific information with high urgency.

  Hereinafter, an embodiment of the present invention will be described using a road communication system as an example.

  As shown in FIG. 1, the road communication system includes a roadside radio device 100 installed in the vicinity of a place where a vehicle passes, such as a road and a parking lot, and the roadside radio device 100 that is mounted on the vehicle and has a narrow area. Information such as traffic information and commercial information is communicated to the vehicle-mounted device (communication terminal) 200 that communicates and provides traffic information, safe driving support information, and commercial information to be transmitted to the driver and the roadside apparatus 100. And an information providing server 300 to be supplied.

  Each roadside apparatus 100 shown in FIG. 1 uses an on-vehicle device 200 mounted on a vehicle traveling on a highway or the like in a specific directional communication area using a so-called radio beacon or optical beacon. Performs narrow area communication. Each roadside apparatus 100 receives and stores received content data and playback control data to be transmitted (hereinafter, content information and playback control data together are referred to as received content data) from the information providing server 300.

(Overall configuration by hardware function)
FIG. 2 is a diagram showing the functional structure of the road communication system. The roadside apparatus 100 installed on the roadside broadcasts a plurality of received content data provided from the information providing server 300 to the vehicle-mounted device 200 mounted on the vehicle that sequentially passes through the communication area.

  The roadside apparatus 100 includes a data update unit 101, a cyclic unit 102, a divided transmission unit 103, and a communication unit 104 in order to broadcast the received content data sequentially to the vehicle-mounted device 200.

  The data update unit 101 has a function of adding / updating a plurality of received content data L provided from the information providing server 300 to a received content data list held by the roadside apparatus 100. For example, when a plurality of content update data I1 to In are provided from the information providing server 300, the presence / absence of received content data to be updated is confirmed in comparison with the currently provided received content data list L. When the received content data does not exist and when it should be updated to the content update data, the received content data is added / updated.

  The cyclic unit 102 has a function of selecting received content data to be transmitted from the received content data list L held by the roadside apparatus 100 and notifying the divided transmission unit 103 of the received content data. For example, it is assumed that the received content data list L held by the roadside apparatus 100 includes received content data N1 to Nn. The cyclic unit 102 selects the received content data N1 from these received content data as the received content data to be transmitted, and notifies the divided transmitting unit 103 of the selected content data. In principle, the cyclic unit 102 processes the received content data N1 to Nn held in the received content data list L sequentially from the top.

  The division transmitting unit 103 creates divided data obtained by dividing the received content data notified from the cyclic unit 102 into predetermined units. Then, the division transmission unit 103 newly adds division header information to the header information of the division data, and creates transmission data for performing broadcast communication within a specific communication area. For example, the division transmission unit 103 divides the received content data N1 selected by the cyclic unit 102 as division data M1 to M3, and adds division header information H1 to H3 to the header information of each division data. Thereafter, the communication unit 104 sequentially converts the divided data to which the divided header information is added into a wireless signal or an optical signal and transmits the wireless signal or the optical signal.

  The vehicle-mounted device 200 includes a communication processing unit 211, a divided data assembling unit 212, a simultaneous reproduction control unit 213, a moving image reproduction unit 214, an audio information reproduction unit 215, and a character information display unit 216.

  The communication processing unit 211 has a function of receiving the divided data transmitted from the vehicle-mounted device 200. The divided data assembling unit 212 has a function of reconfiguring the original received content data N1 based on the divided header information H1 to H3 added to the divided data M1 to M3 sequentially received by the communication processing unit 211. The simultaneous reproduction control unit 213 has a function of determining reproduction conditions such as whether or not the received received content data N1 to Nn should be reproduced simultaneously and whether or not the information should be reproduced based on position information or the like. The moving image reproduction unit 214, the audio information reproduction unit 215, and the character information display unit 216 appropriately provide information to the driver based on the determination result of the simultaneous reproduction control unit 213.

(Hardware configuration of each device and operation of each part)
First, the hardware configuration of the roadside apparatus 100 will be described. As shown in FIG. 3, the hardware of the roadside apparatus 100 includes a communication control unit 111, a storage device 112, a control unit 113, a ROM (Read Only Memory) 114, and a RAM (Random Access Memory) in addition to the wireless communication unit 104 described above. ) 115 and the system bus 116.

  The wireless communication unit 104 communicates information with the vehicle-mounted device 200 installed in the passing vehicle by a wireless signal such as a radio wave signal or an optical signal. The wireless communication unit 104 transmits, for example, traffic information provided from the information providing server 300 to the vehicle-mounted device 200. In addition, the wireless communication unit 104 acquires information such as a vehicle ID transmitted from the vehicle-mounted device 200.

  The communication control unit 111 receives the received content data transmitted from the information providing server 300. In addition, the communication control unit 111 provides the acquired traffic information and the like to the information providing server 300. Further, the communication control unit 111 includes a data update function, a cyclic function, and a divided transmission function in accordance with a communication method of narrow-area communication (Dedicated Short Range Communication: hereinafter referred to as “DSRC”).

  The storage device 112 stores traffic information received from the information providing server 300, traffic information unique to the own device, and the like.

  The control unit 113 includes a processor such as a CPU (Central Processing Unit), and controls the operation of the entire roadside apparatus 100. In particular, the control unit 113 transmits traffic information or the like stored in the storage device 112 from the wireless communication unit 104, and stores information acquired via the wireless communication unit 104 in the storage device 112. In addition, the control unit 113 transmits traffic information and the like acquired by the own device stored in the storage device 112 to the information providing server 300 via the communication control unit 111 and the ITS communication network NW2, and from the information providing server 300 Information acquired via the communication control unit 111 is stored in the storage device 112.

  The ROM 114 stores an OS (Operating System) and various data necessary for operation control of the entire roadside apparatus 100. The RAM 115 functions as a work area (arithmetic processing area) of the control unit 113. The system bus 116 is a transmission path for transferring commands and data between the above units.

  Next, the hardware configuration of the vehicle-mounted device 200 and the operation of each unit will be described.

  The vehicle-mounted device 200 shown in FIG. 1 is mounted on each vehicle and is configured integrally with, for example, a car navigation device. In addition to a general car navigation function, a function of notifying various information including traffic information transmitted from the roadside apparatus 100 is provided.

  As shown in FIG. 4, the vehicle-mounted device 200 includes a communication processing unit 211, an audio processing unit 212, an output unit 213, an operation unit 214, an I / O (Input / Output) device 215, a storage device 216, a control unit 217, a ROM 218, A RAM 219 and a system bus 220 are included.

  The communication processing unit 211 includes functions of the communication unit 201 and the divided data assembly unit 202 described above, and includes a GPS (Global Positioning System) module 211a and a DSRC module 211b.

  The GPS module 211 a receives GPS radio waves from a plurality of GPS satellites with the antenna 221 and supplies them to the control unit 217.

  The DSRC module 211b communicates with the roadside apparatus 100 by the DSRC method via the antenna 211. The DSRC module 211b executes the function of the divided data assembling unit 202 described above. Specifically, the DSRC module 211b performs data processing after assembling and reconfiguring the divided and transmitted data.

  The audio processing unit 212 converts the digital audio signal input from the control unit 217 into an analog audio signal using a D / A converter (not shown), and outputs the analog audio signal to the speaker 222. The audio processing unit 212 converts the audio input from the microphone 223 into a digital audio signal by an A / D converter (not shown), and inputs the digital audio signal to the control unit 217. Thereby, the user can listen to the navigation voice or input the voice.

  The output unit 213 includes a monitor device, and displays a navigation image or a TV image acquired by the communication processing unit 211, a map image stored in advance in the storage device 216, or the like.

  The operation unit 214 includes a touch panel type input device and the like, generates an instruction input signal based on an instruction input by a user, and inputs the instruction input signal to the control unit 217.

  The I / O device 215 includes a DVD-ROM (Digital Versatile Disk-Read Only Memory) drive. The I / O device 215 reads data from a DVD-ROM or CD-ROM storing predetermined map information and inputs the data to the control unit 217. Further, the I / O device 215 inputs detection signals from a sensor group 225 such as a speed sensor, a travel distance sensor, and an azimuth sensor and supplies them to the control unit 217.

  The storage device 216 includes an HDD (Hard Disk Drive), and stores predetermined map information (map data), various setting information, and the like. Note that the storage device 216 may include another memory such as a memory card.

  The control unit 217 may read the map information from a storage medium such as a DVD-ROM that stores the map information at any time, or read the map information from the recording medium in advance and write it in the storage device 216 (installed). You may do it. The control part 217 is comprised from CPU (Central Processing Unit), and controls operation | movement of the onboard equipment 200 whole. For example, the control unit 217 determines the current position of the own device based on the GPS signal received via the GPS module 211a. Further, the control unit 217 takes in the output of the direction sensor included in the sensor group 225 via the I / O device 215, and determines the current traveling direction of the vehicle. Moreover, the control part 217 calculates | requires a travel distance from the output of a distance sensor. In addition, the control unit 217 receives content information such as traffic information from the roadside apparatus 100 via the DSRC module 211b, and based on reproduction timing control data (parameters) included in the received traffic information and the like. Play this. In addition, the control unit 217 performs a reproduction control process described later on highly urgent content information. Note that the control unit 217 may include a coprocessor or the like.

  The ROM 218 stores an OS program and various data necessary for operation control of the entire vehicle-mounted device 200. The RAM 219 is for temporarily storing data and programs, and holds data acquired by the communication processing unit 211, data read from the DVD-ROM, and the like. The control unit 217 uses the RAM 219 as a work memory (arithmetic processing area). The system bus 220 is a transmission path for interconnecting the above-described units and transferring commands and data.

  The in-vehicle device 200 can be functionally divided as follows. That is, as shown in FIG. 5, the data acquisition unit 251, the audio reproduction condition determination unit 252, the data reproduction unit 253, the self-position detection unit 254, the position match determination unit 255, the traveling direction detection unit 256, and the direction match The determination unit 257, the received content data determination unit 258, and the communication area detection unit 259 can be used.

  The data acquisition unit 251 acquires one or more received content data C to be reproduced from the roadside apparatus 100. The received content data includes reproduction control data (control parameter) that indicates the reproduction condition. The received content data C is, for example, moving image data such as MPEG (Moving Picture Experts Group) format, still image data such as JPEG (Joint Photographic Experts Group) format, audio data in TTS (Text-to-Speech) format, and text Contains text data such as information. The data acquisition unit 251 reconstructs the divided data such as the moving image data, still image data, audio data, and text data received by the communication processing unit 211 and then decodes them, or stores them in the storage device 216. The stored data is read and acquired at a predetermined timing. The data acquisition unit 251 is configured by the control unit 217, the communication processing unit 211, and the storage device 216 operating in cooperation.

  The audio reproduction condition determination unit 252 determines whether there is other received content data C to be reproduced in parallel with one received content data C among the received content data C acquired by the data acquisition unit 251. .

  The data reproduction unit 253 reproduces the received content data C. The data reproduction unit 253 is configured by the control unit 217, and is a part having the functions of the previous simultaneous reproduction control unit 203, moving image reproduction unit 204, audio information reproduction unit 205, and character information display unit 206. The data reproduction unit 253 determines whether or not a plurality of contents need to be reproduced in parallel when reproducing the content based on the determination of the audio reproduction condition determination unit 252 and is attached to each content. Whether or not the playback condition is satisfied is determined from the determination results of the position match determination unit 255, the direction match determination unit 257, and the received content data determination unit 258, and the received content data C is played back as the playback data S.

  The self-position detection unit 254 detects the current position by processing the GPS signal. The self-position detecting unit 254 includes a communication processing unit 211 and a part that processes the GPS signal of the control unit 217.

  The position matching determination unit 255 is configured by the control unit 217, and when the content acquired by the data acquisition unit 251 designates a position for reproducing the content, the position indicated by the control information and the self-position detection unit 254. The data reproduction unit 253 is permitted to reproduce data when the reproduction position is within a predetermined radius centered on the reproduction position. Note that the position match determination unit 255 may determine whether the road type (highway, general road, or the like) matches in addition to the traveling direction, and give permission for reproduction.

  The traveling direction detection unit 256 has a function of detecting the traveling direction of the vehicle, and includes a direction sensor, an I / O unit, and a control unit 217.

  The direction coincidence determination unit 257 is configured by the control unit 217, and the direction acquired by the control information when the content acquired by the data acquisition unit 251 specifies the traveling direction of the vehicle as a condition for reproducing the content. When the traveling direction of the host vehicle is compared and matched (within a predetermined error), the data reproduction unit 253 is permitted to reproduce data.

  The received content data determination unit 258 is configured by the control unit 217 and confirms the header information of the divided data acquired by the data acquisition unit 251 to determine whether it is safe driving support information. Specifically, the received content data discriminating unit 258 stores information identifiers used in advance for safe driving support information, and sequentially reads the information identifiers recorded in the header portion of the divided data, thereby content contents. Is detected. As a result, in the case of safe driving support information, the priority of the voice reproduction process is changed on the vehicle-mounted device 200 side. As a method of changing the priority, for example, there is a method of controlling the data reproduction unit 253 to perform the data reproduction interruption process regardless of the result of the determination process of the audio reproduction condition determination unit 252.

  The communication area detection unit 259 detects whether or not the vehicle-mounted device 200 exists in the directional communication area of the roadside apparatus 100. This detection result is used as a reception completion flag of the transmitted divided data or as a flag indicating whether or not the remaining divided data of the received content data C currently being received is likely to be received thereafter.

  Finally, the hardware configuration of the information providing server 300 and the operation of each unit will be described.

  An information providing server 300 shown in FIG. 6 is a device that generates and distributes information such as traffic information for each roadside apparatus 100. As shown in FIG. 6, an input unit 301, an output unit 302, a communication control unit 303, 304, a storage device 305, a control unit 306, a ROM 307, a RAM 308, and a system bus 309.

  The input unit 301 includes a keyboard, a mouse, an input interface, and the like, and inputs various data and instructions. The output unit 302 includes a display device and displays data, messages, and the like.

  The first communication control unit 303 communicates with an external device via a general communication network NW1 such as a telephone line or the Internet, and acquires various information. The second communication control unit 304 is connected to the plurality of roadside wireless devices 100 via the ITS communication network, and transmits traffic information and the like to each roadside wireless device 100. The second communication control unit 304 collects information obtained by the roadside apparatus 100 through communication with the vehicle-mounted device 200 via the ITS communication network NW2.

  The storage device 305 includes a hard disk device and stores various traffic information. In addition, the storage device 305 stores geographical information of the vicinity thereof together with the position, address, and the like of each roadside device 100.

  The control unit 306 includes a processor and controls the operation of the information providing server 300 as a whole. In addition, the control unit 306 creates information to be distributed to each roadside apparatus 100 from the vicinity of the roadside apparatus 100 based on various types of information stored in the storage device 305, and the second communication unit 304 and the ITS communication This is supplied to each roadside apparatus 100 via the network NW2.

  The ROM 307 stores an OS (Operating System) and various data necessary for operation control of the entire information providing server 300. The RAM 308 functions as a work area for the control unit 306. A system bus 309 is a transmission path for transferring commands and data between the above-described units.

  Next, control processing and data reproduction processing performed by the vehicle-mounted device 200 will be described.

  The vehicle-mounted device 200 performs the following first, second, third, and fourth control processes, and provides information promptly and reliably while reflecting the intention of the information providing side to the maximum extent.

  The on-vehicle device 200 records the content of the safe driving support information data in the storage device 216 in advance as a premise of the first control process. For example, specific voice reproduction data such as “Caution for cars on the confluence road from the left”, “Exceeding the speed limit by 30 km” or “There is a sharp curve at 100 m ahead”. This safe driving support information is extremely urgent information. Several such specific information patterns are recorded and used as comparison target data for predicting specific safe driving support information that will be transmitted.

  Specifically, it is assumed that a vehicle 402 has entered the communication area 401 as shown in FIG. The communication area 401 is an area that is closed by an area start line 401a that enables reception on the near side along the traveling direction of the vehicle 402 and an area end line 401b that cannot receive.

  Here, it is assumed that a vehicle enters the communication area 401 and the vehicle-mounted device 200 first receives a part of the divided data of the safe driving support information and other unrelated character information from the roadside apparatus 100. Under such circumstances, the communication control unit 111 of the roadside apparatus 100 does not transmit the remaining divided data for the safe driving support information again unless the following conditions are satisfied. That is, in order to transmit the remaining divided data for the safe driving support information again, it is necessary to complete the transmission of a plurality of information provided by the cyclic function at that time. Therefore, a part of the divided data of the safe driving support information is compared with the voice reproduction data recorded in the storage device 216 in advance.

  For example, if the divided data of “the speed limit is 30 km” has been received in the communication area 401, 9 characters out of the 16 characters of the information “the speed limit is exceeded by 30 km” match. Therefore, it is predicted that the information that “the speed limit has been exceeded by 30 km” is the data that was to be transmitted, and the audio reproduction process is performed using the audio reproduction data recorded in the storage device 216.

  By performing such processing, the vehicle-mounted device 200 is safe even if a state occurs in which the sound reproduction processing is delayed or cannot be received in the communication area 401 due to the communication environment when the vehicle enters the communication area 401. Driving assistance information can be reproduced, and emergency information can be reliably notified to the driver.

  Furthermore, since the in-vehicle device 200 can theoretically predict the received content data C before receiving all the received content data C, it can perform the reproduction process without receiving all the data. Therefore, the vehicle-mounted device 200 can promptly provide information to the driver immediately after entering the communication area 401 or immediately after leaving the communication area 401.

  As a premise of the second control process, the in-vehicle device 200 records some sound reproduction data of the safe driving support information in the storage device 216 in advance as in the first control process. This audio reproduction data is specific audio reproduction data such as “the speed limit has been exceeded by 20 km” or “there is a sharp curve at 100 m ahead”. When the in-vehicle device 200 determines that the reception status in the communication area is poor and the information cannot be completely received, the information is only partially received and the specific information pattern recorded in advance is compared. Estimate specific safe driving support information that should have been transmitted from the result.

  By performing such processing, the vehicle-mounted device 200 can perform the sound reproduction processing of the safe driving support information even when all the divided data cannot be received in the communication area 401. Therefore, the vehicle-mounted device 200 can provide information more accurately.

  When the in-vehicle device 200 determines that all the divided data constituting the received content data C has not been received as the third control process, the on-vehicle device 200 extracts data of a specific portion from the already received divided data.

  Specifically, it is assumed that there is received content data C serving as safe driving support information that “There is a sharp curve at 100 m ahead”. The in-vehicle device 200 receives only the divided data “having a sharp curve” when the divided data of the received content data C includes “divided to 100m ahead” and “having a sharp curve” respectively. The voice reproduction process is performed only for the “steep curve”.

  By performing such processing, the vehicle-mounted device 200 can alert the driver to the minimum even in a situation where the reproduction processing itself cannot be performed conventionally. For example, words such as “steep curve”, “accident car”, “traffic jam”, “road slip” are registered as specific portion data. These words are preferably words that can be perceived by the driver from the surrounding situation.

  In addition, when there is a lot of data received in the reception area 401, it may take time to detect the safe driving support information from the information stored in the storage device 216 or the RAM 219 once.

  For this reason, in the fourth control process, the safe driving support information is regenerated with priority over other information. That is, instead of sequentially reproducing the transmitted divided data, the safe driving support information with high urgency is reproduced prior to other data.

  The control part of the specific process flow of the first to fourth control processes described above will be described with reference to FIGS.

  This processing process shows a data reproduction process performed by the control unit 217, FIG. 8 shows a state transition diagram, and FIG. 9 shows a flowchart.

  As shown in FIG. 8, the control unit 217 controls data reproduction while changing the four states of the reception determination mode 501, the prediction determination mode 502, the estimation determination mode 503, and the extraction determination mode 504.

  The control unit 217 sets the initial state to the reception determination mode 501. The control unit 217 starts the process when the divided data is received as shown in FIG. 9 (step S510). The control unit 217 reads the header information and performs a determination process (step S511) as to whether or not the identifier matches the identifier indicating the safe driving support information. And when it corresponds, it transfers to the prediction determination mode 502. FIG. If they do not match, the determination process described above (step S511) is continued in the reception determination mode 501.

  In the prediction determination mode 502, the control unit 217 determines whether or not the vehicle-mounted device 200 is in the communication area 401 (step S512), and while in the communication area 401, the utterance pattern that matches the transmitted divided data. And the process of predicting the utterance content (step S513) is sequentially performed. The prediction determination process (step S513) is performed only on a single divided data. If the received divided data can be confirmed to match the utterance pattern with a specific ratio or more, the control unit 217 performs a reproduction process (step S517) for immediately reproducing the data.

  When the divided data received in the prediction determination process (step S513) does not match the utterance pattern by a specific ratio or more, the control unit 217 shifts to the reception determination mode 501 on the condition that it is in the communication area 401. .

  If the control unit 217 receives all the divided data during the prediction determination process (step S513), the control unit 217 stops the prediction determination process in step S513 and immediately reproduces the data ( Step S517) is performed. Instead of the determination condition as to whether or not the communication area 401 is in step S512, the determination condition as to whether or not a predetermined time (for example, 1 second) has passed from the communication area 401 may be used.

  If the control unit 217 is in the prediction determination mode 502 and receives a notification from the communication area detection unit 259 that it is outside the communication area, the control unit 217 shifts to the estimation determination mode 503.

  The estimation determination process (step S514) is basically the same method as the speech pattern used in the prediction determination process (step S513) in the prediction determination mode 502. However, the difference from the prediction determination process (step S513) is that the process up to the last received divided data is assembled as the received content data C and the matching process with the utterance pattern (step S514) is performed.

  When the utterance pattern is specified by the estimation determination process in step S514 in the estimation determination mode 503, the control unit 217 immediately performs the data reproduction process (step S517).

  The control unit 217 performs matching processing in the guess determination processing (step S514), and when the acquired data does not match any of the utterance patterns, the control unit 217 proceeds to the extraction determination mode 504.

  In the extraction determination mode 504, the control unit 217 performs matching processing (step S515) as to whether it matches an important utterance pattern (word). When the acquired data matches an important utterance pattern, the control unit 217 immediately performs data reproduction processing (step S517) only on that portion.

  If the acquired data does not match any important utterance pattern, the control unit 217 internally discards the received content data C as a reproduction processing error (step S516).

  Although the embodiments of the present invention have been described above, the present invention can be variously modified without departing from the gist thereof. For example, in this embodiment, an audio reproduction processing method that employs all of the processing in the prediction determination mode 502, the speech processing in the estimation determination mode 503, and the speech processing in the extraction determination mode 504 is employed. It is good also as a reproduction | regeneration control process of the onboard equipment 200 combining one control process or two control processes.

  In addition, when there is particularly urgent information among the safe driving support information, any one or a plurality of control processes of the first to fourth control processes described above are performed on the information. Also good. Further, since safe driving support information has low urgency, any one or a plurality of control processes described above may be performed on the information.

  In addition, the received content data C received by the vehicle-mounted device 200 in the present embodiment is provided from the roadside wireless device 100 that generates the communication area 401 into which the vehicle 402 has entered, and is described on the assumption that voice reproduction processing is performed immediately. Yes. However, the vehicle-mounted device 200 may receive the received content data C to be played back in advance through communication with the other plurality of roadside apparatuses 100 installed, and the playback control process described above may be performed.

  Moreover, although embodiment mentioned above demonstrated the audio | voice reproduction | regeneration as an example, it is good also considering image data. That is, among a plurality of image data or all received content data C, image data with high urgency is reproduced by combining any one or more of the first to fourth control processes described above. You may do it.

  In the above-described embodiment, the specific received content data C, that is, safe driving support information as highly urgent information has been described as an example. However, the specific received content data C is information not directly related to driving, for example, war It is good also as start information, earthquake start information, etc.

  The above-described system is preferable when applied to a highway, but can be applied to all roads. Moreover, although the narrow communication system called DSRC was demonstrated as an example as a communication system, it is applicable also to a wide area communication system.

  In the above-described embodiment, when the vehicle 402 leaves the communication area 401 (area out), information with high urgency such as safe driving support information is reproduced within a predetermined time (for example, within 1 second) from the area out. However, the present invention can also be applied to those that do not need to be reproduced within a predetermined time from the area-out.

  In addition, the system described above is a system having the information providing server 300, but information stored or transmitted in the roadside apparatus 100 is received from a storage medium such as a CD or a DVD, not from another server, or broadcasted. It may be transmitted through the network.

  In the above-described embodiment, the vehicle-mounted device 200 mounted on the vehicle has been described as an example of the information receiving unit. However, a communication terminal such as a portable personal computer or a mobile phone is mounted and operated. Also good. Furthermore, in the above-described embodiment, the functions of the roadside apparatus 100, the vehicle-mounted device 200, and the like are performed as function-specific means by specifying specific hardware. Processing and execution may be performed by software.

  The present invention can be used for all road communication systems. Further, for example, it can be used as a narrow area communication system used in ITS, a DSRC in-vehicle device, a sound reproduction processing method used in them, and a program.

1 is an overall configuration diagram of a road communication system according to an embodiment of the present invention. It is the figure which showed the relationship and main state of the roadside radio | wireless apparatus which are main hardwares of a road communication system, an onboard equipment, and an information provision server. It is a figure which shows the hardware constitutions of the roadside radio | wireless apparatus installed in the road side in the road communication system of FIG. It is a figure which shows the structure of the onboard equipment mounted in the vehicle in the road communication system of FIG. It is a figure for demonstrating the function of the onboard equipment shown by FIG. It is a figure which shows the structural example of the information provision server shown by FIG. It is a figure which shows the vehicle which approached into a certain communication area in the road communication system of FIG. It is a state transition diagram at the time of the process by the audio | voice reproduction | regeneration part of onboard equipment in the road communication system of FIG. It is a figure which shows the audio | voice reproduction | regeneration processing flow of an onboard equipment in the road communication system of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Roadside apparatus 104 Wireless communication part 111 Communication control part 112 Storage device 113 Control part 200 Onboard equipment (communication terminal)
211 Communication processing unit 212 Audio processing unit 213 Output unit 214 Operation unit 216 Storage device 217 Control unit 251 Data acquisition unit 252 Audio reproduction condition determination unit 253 Data reproduction unit 254 Self-position detection unit 255 Position coincidence determination unit 256 Travel direction detection unit 257 Direction match determination unit 258 Data type detection unit 259 Communication area detection unit 300 Information providing server 301 Input unit 302 Output unit 303, 304 Communication control unit 305 Storage unit 306 Control unit

Claims (7)

A road communication system comprising: a roadside wireless device installed on a roadside; and an on-vehicle device that receives and reproduces data transmitted from a communication unit of the roadside wireless device mounted on a vehicle,
The control unit of the on-vehicle device
Determine whether the data received from the roadside device is specific received content data,
When it is determined that it is the specific received content data, a process for instructing the reproduction unit to preferentially reproduce the specific received content data is performed,
It is determined whether or not a part of the specific received content data is received from the roadside wireless device, and when it is determined that the specific received content data is received, the specific received content data recorded in advance in the storage unit of the on-vehicle device A road communication system characterized in that a specific received content data transmitted by comparing a pattern and received data is predicted, and a process for reproducing the predicted received specific content data is performed. A road communication system comprising: a roadside wireless device installed on a roadside; and an on-vehicle device that receives and reproduces data transmitted from a communication unit of the roadside wireless device mounted on a vehicle,
The control unit of the on-vehicle device
Determine whether the data received from the roadside device is specific received content data,
When it is determined that it is the specific received content data, a process for instructing the reproduction unit to preferentially reproduce the specific received content data is performed,
It is determined whether or not a part of the data constituting the specific received content data has been received from the roadside wireless device. If it is determined that all of the data has not been received, the received part of the data is recorded in advance. The specific received content data patterns are compared, the specific received content data transmitted is estimated from the comparison result, and the estimated received specific received content data pattern is reproduced. A road communication system characterized by the above. A road communication system comprising: a roadside wireless device installed on a roadside; and an on-vehicle device that receives and reproduces data transmitted from a communication unit of the roadside wireless device mounted on a vehicle,
The control unit of the on-vehicle device
Determine whether the data received from the roadside device is specific received content data,
When it is determined that it is the specific received content data, a process for instructing the reproduction unit to preferentially reproduce the specific received content data is performed,
The processing is performed such that, among a plurality of received content data received from the roadside wireless device, information that is highly urgent for safe driving is reproduced with priority over other received content data that is not urgent for safe driving. A road traffic system characterized by that. The roadside wireless device includes a storage unit, a control unit, and a communication unit, and the vehicle-mounted device includes a storage unit, a control unit, a communication unit, and a playback unit, and a plurality of the received content data for the roadside wireless device. And an information providing server for providing
The control unit of the roadside apparatus is
Means for recording a plurality of the received content data transmitted from the information providing server in a storage unit of the roadside apparatus;
Means for dividing the received content data recorded in the storage unit of the roadside apparatus into predetermined packet units;
Means for giving header information to the data obtained by dividing the received content data,
The communication unit of the roadside apparatus is
Means for transmitting the divided data provided with the header information a plurality of times,
The control unit of the vehicle-mounted device is
Means for reconstructing the divided data as the received content data based on the header information;
Means for determining whether or not it is specific received content data from the divided data;
The road communication system according to any one of claims 1 to 3, further comprising means for reproducing the specific received content data. A communication terminal having a storage unit, a control unit, a communication unit and a playback unit,
The control unit of the communication terminal
Means for reconstructing the received content data based on the header information of the received divided data;
Means for determining whether or not it is specific received content data from the divided data;
Means for instructing the playback section to play back the specific received content data preferentially in the case of the specific received content data;
Furthermore, it has any one or more of the following (A) to (D),
(A) When it is determined that the divided data that is a part of the specific received content data is received, the pattern of the specific received content data recorded in the storage unit in advance is compared with the received divided data Means for predicting the specific received content data transmitted as
Means for instructing the playback unit to play back the predicted specific received content data; and (B) when it is determined that all of the divided data constituting the specific received content data has not been received. Means for comparing the divided data and the pattern of the specific received content data recorded in advance;
Means for estimating the specific received content data transmitted from the comparison result;
Means for instructing the playback unit to play back the speculated received content data;
(C) When it is determined that all of the divided data constituting the specific received content data has not been received,
Means for extracting a part from the received divided data;
Means for instructing the reproducing unit to reproduce the extracted partial data;
(D) Among the plurality of received content data received when it is determined that a part or all of the specific received content data has been received, the specific received content data that is highly urgent for safe driving is urgent for safe driving Means for instructing the reproduction unit to reproduce the received content data with lower priority than other received content data;
The above-mentioned reproduction part is provided with a means to perform reproduction processing of the above-mentioned information based on any one or a plurality of above-mentioned (A)-(D). A communication terminal characterized by things. A data reproduction processing method used for a communication terminal having a storage unit and a reproduction unit,
Reconstructing the received content data based on the header information of the received divided data;
Determining whether it is specific received content data from the divided data;
Instructing the playback unit to play the specific received content data preferentially in the case of the specific received content data;
Furthermore, it has at least any one or a plurality of steps of (A) to (D) below,
(A) When it is determined that the divided data that is a part of the specific received content data is received, the pattern of the specific received content data recorded in the storage unit in advance is compared with the received divided data Predicting the specific received content data to be transmitted,
Instructing the playback unit to play back the specific received content data predicted;
(B) a step of comparing the received divided data with a pattern of the specific received content data recorded in advance when it is determined that all of the divided data constituting the specific received content data has not been received;
Inferring the specific received content data transmitted from the comparison result;
Instructing the playback unit to play back the speculated received content data;
(C) when it is determined that all of the divided data constituting the specific received content data has not been received, extracting a part from the received divided data;
Instructing the playback unit to play back the extracted partial data;
(D) Among the plurality of received content data received when it is determined that a part or all of the specific received content data has been received, the specific received content data that is highly urgent for safe driving is urgent for safe driving Instructing the reproduction unit to reproduce the received content data with lower priority than other received content data;
The reproduction unit includes a step of performing reproduction processing of the information based on any one or a plurality of steps of (A) to (D). A data reproduction program for causing a computer having a storage unit and a reproduction unit to function,
Means for reconstructing the received content data based on the header information of the received divided data;
Means for determining whether the received data is specific received data from the divided data;
Means for instructing the playback unit to play back the specific received content data preferentially in the case of the specific received content data;
Further, any one or more of the following (A) to (D),
(A) When it is determined that the divided data that is a part of the specific received content data is received, the pattern of the specific received content data recorded in the storage unit in advance is compared with the received divided data Means for predicting the specific received content data to be transmitted,
Means for instructing the reproduction unit to reproduce the specific received content data predicted;
(B) means for comparing the received divided data with a pattern of the specific received content data recorded in advance when it is determined that all of the divided data constituting the specific received content data has not been received;
Means for inferring the specific received content data transmitted from the comparison result;
Means for instructing the playback unit to play back the speculated received content data;
(C) means for extracting a part from the received divided data when it is determined that all of the divided data constituting the specific received content data has not been received;
Means for instructing the reproducing unit to reproduce the extracted partial data;
(D) Among the plurality of received content data received when it is determined that a part or all of the specific received content data has been received, the specific received content data that is highly urgent for safe driving is urgent for safe driving Means for instructing the reproduction unit to reproduce the received content data with lower priority than other received content data;
The reproduction unit causes the computer to function as a means for performing a reproduction process of the received content data specified based on any one or a plurality of means (A) to (D). program.

Images