KR100456692B1 - Buffered Roadside Broadcasting Method and its Apparatus using the Dedicated Short Range Communication - Google Patents

Abstract

The present invention relates to a method and apparatus for providing a storage roadside broadcast service using dedicated short range communication. In the short-range dedicated communication system, the communication radius is very short, about tens to hundreds of meters, so if the communication area of the roadside base station is not overlapped or connected to each other, it is very difficult to receive and reproduce the voice data in real time in the vehicle driving at high speed. Lose. According to the present invention, when the communication area of the base station is very narrow and the communication time is very short, a predetermined period of receiving the received message when the load of the receiving terminal is light after receiving and storing digital audio data classified for each message from the base station at high speed. By playing a certain number of times, the broadcast service is possible even in a short-range dedicated wireless communication environment.

In the present invention, the operation method of the receiving terminal device for each state of the road and the message structure and contents for the storage-type roadside broadcasting are presented. In addition, the broadcast terminal receiving processing procedure and the structure of the receiving terminal apparatus are proposed in the receiving terminal apparatus.

Description

Buffered Roadside Broadcasting Method and its Apparatus using the Dedicated Short Range Communication}

Dedicated Short Range Communication (DSRC) is a radio (RF, laser, infrared, ultrasonic) between a vehicle-mounted device mounted on a high-speed vehicle and a roadside base station device installed on a roadside with a relatively narrow communication area. It is an effective communication method that provides a means of communication and plays an important role in the Intelligent Transport System (ITS). The present invention is a technique for providing point-of-interest (POI) information in a broadcast form using DSRC communication used in an intelligent transportation system. In order to provide broadcast information in a roadside base station apparatus, conventionally, a predetermined short data symbol is broadcast in advance, and the on-vehicle terminal apparatus receives the received information and recognizes its meaning (information, event, status), and thus, there is a lot of limitation in information transmission. In the case of continuous broadcasting, the service is provided only in the communication area of the roadside base station apparatus, so it is very difficult to receive the service using a vehicle mounted terminal moving at high speed.

In addition, the local traffic broadcasting station provides traffic information broadcasting service, but since the service area is too large, POI information broadcasting is almost impossible, and re-broadcasting of the same broadcast message is also performed by the broadcasting signal transmitting station (base station apparatus). Therefore, information consumers (vehicle drivers, etc.) are mostly far from themselves or rarely related to them, rather than effectively receiving information near their own location.

The present invention receives broadcast messages at high speed when a vehicle-mounted terminal device running at a high speed passes a relatively short communication area provided by a roadside base station apparatus, and combines the received message slots when the terminal device is not busy or outside the communication area. To make one complete signal and send it to audio output device at predetermined time intervals and play it at a predetermined number of times so that broadcasting service is possible even in DSRC communication environment. In particular, point-of-interest (POI) using DSRC -Interest) It is to enable information broadcasting.

To this end, the base station apparatus divides and stores the input unit broadcast messages into slots having a predetermined size, and repeatedly transmits them according to a broadcast period according to the importance of each message. The on-board terminal device combines data broadcast in units of slots in the broadcast receiving area, combines them into a single message, stores them in a predetermined location in a message pool, and plays them back as audio when necessary.

1 is a conceptual diagram of a buffered roadside broadcast.

2 is a diagram showing an embodiment in which a stored roadside broadcasting method is applied to traffic information broadcasting

Figure 3 is an embodiment of the information collection, processing and distribution structure for storage roadside broadcast

4 illustrates an embodiment of a message structure for a stored roadside broadcast.

5 is a flow chart of a stored roadside broadcast message receiving process.

6 is a structural diagram of a storage type roadside receiving terminal * Explanation of the main parts of the drawings * 131: Broadcast message reception and storage section 121,122: Vehicle-mounted terminal 111,112: Base station apparatus 101,102: Communication area

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to solve the above problem, the present invention provides voice information from a base station to a vehicle-mounted terminal using short-range wireless communication between a base station installed at a roadside and a vehicle-mounted terminal mounted on a vehicle. In the method for providing a service, the data receiving step of receiving and storing the audio data transmitted from the base station for maintaining the data to be sent to the vehicle-mounted terminal 121,122 to the on-board terminal in the broadcast message receiving and storage section 131 ; And when the load of the on-vehicle playback section 132 or the on-vehicle terminal is less than the load of the on-vehicle terminal or the base station communication area, the on-vehicle terminal combines and restores the stored audio data as audio. A storage broadcast service providing method using a short-range dedicated wireless communication network comprising a data reproduction step of reproducing processing. FIG. 1 is a conceptual diagram illustrating a buffered roadside broadcasting. After classifying by message and converting individual messages into digital audio data, the corresponding base station broadcast pool is modified by dividing by a predetermined slot length. The base station data transmission module periodically transmits (broadcasts) this based on a predetermined rule. Vehicle-mounted terminals 121 and 122, which are receiver devices mounted on a vehicle, receive audio information slots transmitted from the base station apparatus and store them in their broadcast reception memory, and then no more slots are received or the processor block 63 IDLE. When not busy, the received audio information slots are combined to reproduce the voice using the audio decoder 67.

FIG. 1 is a diagram for explaining a basic concept of a buffered roadside broadcast, in which the communication area 101 indicates a communication area of the base station apparatus 111, and the communication area 102 indicates a corresponding base station 111. As shown in FIG. Indicates a communicable area of the neighboring base station 112. The communication area of the base station apparatus is a section 131 in which the vehicle mounting apparatuses 121 and 122 may receive and store a broadcast message, and receive and store broadcast message slots when the vehicle mounting apparatuses 121 and 122 are in the section 131. If the device is out of the communication area (101, 102) of the base station apparatus or is within the communication area (101, 102), the processing processor of the terminal device plays back according to an arbitrary rule in the section 132 of IDLE. It is preferable to process a display, an LED, or an alarm sound to attract the driver's attention. FIG. 2 illustrates an embodiment in which a stored roadside broadcasting method is applied to traffic information broadcasting.

Figure 2 is an example of applying the storage-type roadside broadcasting method to the traffic information broadcasting, the road network is represented by expressing the road 200 as a line, the vehicle-mounted terminal device 201 is displayed, i is greater than 0 and the vertical side Assuming that j is greater than 0 and that the horizontal coordinate is assumed, the position of the base station apparatus may be represented by i, j, and the base station apparatus (i, j) is assumed to represent the base station apparatus at the coordinate intersection point of i and j. When the vehicle-mounted terminal device 201 reaches the communication area 233 of the base station apparatuses 3 and 3, it receives and stores traffic information of an adjacent area transmitted by the base station apparatuses 3 and 3, and Audio is delivered to the driver and passengers. The driver can easily know the traffic information and the surrounding traffic conditions at the point where he proceeds. In addition, the base station devices may prepare a broadcast message by weighting message information for each distance or point based on its location. That is, in the case of the base station apparatus (3,3), of the road intersection (3,4), (2,3), (4,3), (1,6), (5,6), (1,1) 3 is an embodiment of an information collection, processing, and distribution structure for storage type roadside broadcasting. In the present invention, in FIG. A broadcast message generating step of converting information into audio data for each information; And distributing the messages to a base station in a broadcast message collection, processing, and distribution processing center 33, and broadcasting messages transmitting the messages periodically at the base station; and receiving a vehicle message terminal 121 and 122 in a broadcast message reception and storage section 131. A data receiving step of receiving and storing audio data transmitted from a base station which maintains data to be transmitted to a vehicle-mounted terminal; And when the load of the on-vehicle playback section 132 or the on-vehicle terminal is less than the load of the on-vehicle terminal or the base station communication area, the on-vehicle terminal combines and restores the stored audio data as audio. The present invention provides a method for providing a storage-type broadcast service using a short-range dedicated wireless communication network including a data reproducing step of reproducing. The traffic information is a concept including not only traffic information but also additional information.

3 shows an example of a structure for collecting, processing, and distributing traffic information for storage-type roadside broadcasting. The communication area 321 is a communication area of the base station apparatus 311, and the communication area 32x is a base station apparatus 31x. ) Indicates the available communication area. The broadcast message collection, processing, and distribution processing center 33 is connected to one or more base station devices and processes the collected information and traffic information from various information sources (34, 35, 36, etc.) into audio data ( The base station apparatus receives this information, modifies and stores the base station broadcast pool (message storage), and transmits it periodically according to a predetermined rule. According to an embodiment of the present invention, in the broadcast message generating step, the broadcast message structure is divided into slots having a predetermined length so that a receiving terminal apparatus receives these slots and sequentially combines them into unit messages. Using a short-range dedicated wireless communication network characterized in that the slot is configured to include a message number, slot order number in each slot It presents the intestinal broadcasting service method.

As an example of the message structure for the stored roadside broadcasting shown in FIG. 4, the broadcast pool of the roadside base station apparatus includes one or more broadcast messages (401, 402, 403, ...), and each broadcast message includes one or more slots. (4021,4022,..., 402n). The base station apparatus sends the messages in any order. Each slot has a maximum size, and the message number, message length, priority, message generation time, message validity period, slot sequence number, message data, voice recovery method (40220), etc. can be easily combined into a specific message at the receiving side. This is included. The voice recovery method is a concept including information such as a decoding method, a coding rate, and the like. FIG. 5 is a process diagram of a storage type roadside broadcast message receiving process. The present invention provides a method of providing a storage-type broadcast service using a short-range wireless communication network, which periodically checks a broadcast message and removes the corresponding message from a stored place when the validity period has passed or the broadcast message playback count is exceeded. Storage type broadcast service using a short-range wireless communication network, characterized in that by periodically checking the broadcast message received in the broadcast message receiving step, and removes the message from the stored place when the validity period has passed or the number of times the broadcast message playback is exceeded It also suggests how to provide it.

5 shows a message receiving processing procedure of a stored roadside broadcasting in a receiving terminal apparatus. If a broadcasting message is being received in the condition checking step (51), the broadcasting message slot is received (52). ) Is checked and stored / registered at the corresponding position in the broadcast message storage space (pool) 54 only if normally received, and then goes back to the condition checking step 51. If the message slot is not normally received in the condition check of (53), it is discarded and sent to the step of checking (51) the broadcast message reception status again. While not receiving a broadcast message, it is checked 55 whether there is a complete message (valid message) in the broadcast message storage space (pool), and if more than one valid message is present (55), If the validity of the message and the number of times of playback are exceeded (56), if any of the two conditions described above are not satisfied (56), the message is removed from the message pool (57) and the condition of (55) is again checked. If the condition (55) is not satisfied, it is checked again whether or not the broadcast message is received (51). If both conditions of (56) are not satisfied, when the voice playback cycle is reached, the audio data message is decoded and sent to a voice output device such as a speaker, and the playback count counter is increased by one (51). Switch to the step of checking the conditions. If the condition check in step 58 does not correspond to the sound reproducing period, the process is switched to the condition checking step in step 51. Fig. 6 is a structural diagram of a storage type roadside broadcasting receiving terminal. In the apparatus for providing information service from the base station to the vehicle-mounted terminal using short-range wireless communication between the vehicle-mounted terminal, the wireless transmission and reception block 61, modem and channel codec 62, and signal processing and control functions A processor block 15, a broadcast message pool 66 for storing broadcast messages, an audio decoder 67 for reading out the broadcast message data in the memory 66 and reproducing an audio signal before compression, and the audio decoder. Storage type broadcast service providing apparatus using a short-range dedicated wireless communication network comprising a receiving terminal consisting of an audio output device (65) for processing to listen to the output signal of (67) To present.

6 shows a structure of a storage type roadside receiving terminal device. The terminal device main processor block 63 performs signal processing in association with a wireless transmission / reception block 61, a modem, and a channel codec 62. The processor block 63 stores the received audio data or deletes the stored data in the broadcast message receiving pool 66 capable of storing the audio data. In addition, the processor block 63 generates a control signal necessary for the audio decoder 67 and controls the audio decoder 67 to reproduce the original audio signal to generate an audio signal and send it to the audio output device. The input data for reproducing the original audio signal is taken from a specific area of the broadcast message receiving pool 66 under the control of the process block 63. The audio control device and the user input device 64 generate and send control signals such as a voice recovery method and a recovered data rate to the audio decoder 67 in cooperation with the processor block. The decoded audio signal is transmitted to an audio output device 65 such as a speaker through the audio control and visual display device 68.

Intelligent Transport System is a bus that detects the location of a vehicle by transmitting its vehicle status or ID to a base station from a traffic violation control system using a camera, various sensor systems for controlling traffic lights, and a vehicle terminal system. Although information systems, electronic toll collection systems, and location information systems using GPS have been introduced, there are no means to effectively provide surrounding traffic and guidance information to driving vehicles.

The present invention provides a real-time road situation information to the driver by providing a means that can effectively provide POI (point-related) information by voice to a vehicle traveling at high speed using a simple DSRC base station device and a terminal device to solve this problem The driver can be guided on the fast route and provide information on sudden curves, unexpected conditions, construction sites, and road conditions to prevent accidents and provide a comfortable driving environment.

Claims (7)

In the method for providing voice information service from the base station to the vehicle-mounted terminal using short-range wireless communication between the base station installed on the roadside and the vehicle-mounted terminal mounted on the vehicle, A broadcast message receiving step of receiving and storing a broadcast message transmitted from a base station that maintains data to be transmitted to the onboard terminal by the on-vehicle terminals 121 and 122 in the broadcast message reception and storage section 131; And The broadcast message stored in the on-board terminal is reproduced as audio by combining and restoring the stored audio data in the in-vehicle message playback section 132 or when the load on the on-board terminal is low or leaves the base station communication area. Receiving a broadcast message processing step; providing a storage-type broadcast service using a short-range dedicated wireless communication network comprising a. delete The method of claim 1, Before the broadcast message receiving step, A broadcast message generation step of converting traffic information of neighboring adjacent road networks into audio data for each unit information; And And distributing the messages to a base station in a broadcast message collection, processing, and distribution processing center (33), and periodically transmitting the messages at the base station. The method of claim 3, In the broadcast message generating step, the broadcast message structure is divided into slots having a predetermined length, and the receiving terminal apparatus receives the slots and includes the message number and the slot order number in each slot so that the receiving terminal apparatus can receive the slots and combine them into unit messages. Storage type broadcast service providing method using a short-range dedicated wireless communication network, characterized in that the configuration. delete The method of claim 1, Storage type broadcast service using a short-range wireless communication network, characterized in that by periodically checking the broadcast message received in the broadcast message receiving step, and removes the message from the stored place when the validity period has passed or the number of times the broadcast message playback is exceeded How to Provide. An apparatus for providing voice information service from a base station to a vehicle-mounted terminal using short-range wireless communication between a base station installed at a roadside and a vehicle-mounted terminal mounted on a vehicle. Wireless transmit and receive block 61, Modem and channel codec 62, A processor block 15 for signal processing and control, A broadcast message pool 66 for storing broadcast messages; An audio decoder 67 which reads out the broadcast message data in the memory 66 and reproduces the audio signal before compression; Storage-type broadcasting service providing apparatus using a short-range dedicated wireless communication network comprising a receiving terminal consisting of an audio output device (65) for processing to hear the output signal of the audio decoder (67).