JPH04170115A - Road side beacon - Google Patents

Abstract

PURPOSE:To attain the communication of a message between vehicles by providing a mail box area accessed by a group ID code transmitted from a vehicle and writing/reading a data to a message CONSTITUTION:When a vehicle 1 enters the communication area of a beacon, the vehicle receives a frame synchronizing signal 10 from a road side beacon and sends a message MSG 13 addressed to the other party of a same group having its own group ID code in a header 12 for a succeeding incoming time slot period 11. The road side beacon system receives the message to recognize it that a vehicle belonging to the group ID enters the communication area, the reception of part or all of a multiple address data 15 is interrupted in a succeeding outgoing time slot 14 and a message in a group ID mail box is sent instead. Thus, a stand alone type position beacon is used to attain the communication of a message between vehicles.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a roadside beacon that performs intermittent zone communication with a vehicle.

[Prior Art] As a roadside beacon used in a conventional road-to-vehicle information system, a stand-alone beacon (hereinafter referred to as a location beacon) that only transmits fixed information such as location information is known. In addition, beacons that are connected to the center side and perform two-way communication between vehicles and the center (hereinafter referred to as individual communication beacons) can be
Development of road-to-vehicle information system Summary report December 1989
The one listed in P, 56J published by the Ministry of Construction is known.

FIG. 2 is a diagram showing a schematic configuration of a conventional position beacon. The position beacon is an antenna 2 that communicates with the vehicle 1.
, a wireless transmitter 3 and a communication control unit 4 connected to the wireless transmitter 3, and the data in the communication data memory 5 that stores fixed information such as position information is transmitted to the communication control unit.
-4, data is transmitted to the vehicle 1 under control.

Since the position beacon is a one-way communication, it is theoretically impossible to realize communication between vehicles using the position beacon.

FIG. 3 is a diagram showing a schematic configuration of a conventional individual communication beacon. In the case of an individual communication beacon, since communication with the vehicle 1 is bidirectional communication, a wireless transceiver 3a having a transmitting and receiving function is used. Data exchanged with the vehicle 1 is transmitted from the communication control unit 4 to the network 8 via the modeci 7, and then transmitted to and received from the center device 9.

As described above, since individual communication beacons have a two-way communication function, it is not impossible to realize inter-vehicle communication via the center device 9.

[Problems to be Solved by the Invention] However, when attempting to perform inter-vehicle communication using a conventional individual communication beacon, a network 8 including a center device 9 was required on the upper side of the beacon. When predicting the gradual implementation and spread of road-to-vehicle information systems, it is predicted that initially stand-alone location beacons without an upper network will be widely used nationwide due to their simplicity and economic efficiency. Therefore, it is common to use location beacons at this initial research stage, but
Conventional position beacons cannot realize message communication between vehicles.

The present invention was made to solve the drawback that the above-mentioned stand-alone position beacon could not communicate messages between vehicles. The purpose is to provide a roadside beacon that enables metasage communication.

[Means for Solving the Problems] The present invention provides a mailbox area in the data storage area of a roadside beacon, which is accessed by a Group II code transmitted from the vehicle and is used to write or read data. be.

[Operation] In the present invention, when vehicles belonging to a vehicle group to which a group ID code has been assigned in advance pass a roadside beacon, the ID numbers and outgoing messages of these vehicles are sent to the mailbox corresponding to the group ID in the beacon. Automatically recorded. When a following vehicle with the same group ID code passes the beacon, it selectively reads the contents of the mailbox corresponding to the group D code and sends it, allowing messages to be exchanged between vehicles belonging to the same group. It becomes possible.

[Embodiment] □ Fig. 1 shows a block diagram of the configuration of a roadside beacon according to an embodiment of the present invention. The present invention differs from the configuration of conventional position beacons in that a mailbox memory 6 having a mailbox function is provided within the data storage area of the beacon. The wireless transceiver 3a is connected to a communication control unit (CCU) 4, and the CCU 4 is configured to control a transmission data memory 5 in which fixed information is stored, as well as a mailbox memory 6. The vehicle 1 forms a wireless communication area of approximately several tens of meters between the vehicle 1 and the beacon configured in this manner. Vehicle 1
The in-vehicle wireless device installed in the vehicle has basically the same configuration as the in-vehicle device in the conventional individual communication beacon system shown in FIG. 3, so a detailed explanation thereof will be omitted. However, in the present invention, the vehicle ID
Part of the number is a specific group ID number (GI
D) is given in advance.

Next, the operation of the system shown in FIG. 1 will be explained. First, the CCU 4 of the beacon normally reads the transmission information contents in the transmission data memory 5, and transmits it to the wireless transceiver 3 according to a predetermined transmission rate.
The antenna 2 is constantly transmitting data via the antenna 2. In this case, since the contents of the transmission data memory 5 are circular data that should be received by all vehicles, a header indicating a circular is added to the beginning of the data. When the vehicle 1 enters the communication area of this beacon, the in-vehicle radio transmits a MSG indicating that the strength of the radio waves from the beacon is above a certain value.

In this case, when there is no message, only group ■D is sent. The beacon side receives this, and the CCU 4 reads this group ID and adds this message data to the mailbox memory 6 corresponding to the ID. At the same time, the data content of the mailbox memory 6 is read out, and the data with the group ID added as a header is transmitted via the wireless transceiver 3. Note that at this time, the transmission of the broadcast data from the transmission data memory 5 is temporarily interrupted. Among the received data, the vehicle 1 recognizes the data to which its own group ID is attached in addition to the circular data as a message addressed to itself, and
Take this in.

By the above-described operation, each vehicle belonging to the group can leave its own message in the mailbox memory 6 and also receive messages from the preceding vehicle all at once. Note that the content of the message is not limited to voice, but may also include letters, graphics, and the like.

FIG. 4 shows an example of a frame book-mat showing the procedure of wireless communication between a vehicle and a position beacon in the present invention. A roadside beacon always cyclically transmits one frame with a frame synchronization signal at the beginning.

In this embodiment, upstream/downstream slots are fixedly allocated within one frame, and the content of downstream data is broadcast data.

When the vehicle enters the communication area of the vehicle, the vehicle receives the frame synchronization signal 10 from the roadside beacon,
It transmits the following upstream time slot S G 1.3. The roadside beacon receives this and identifies the group ID.
It is learned that a vehicle belonging to
Part or all of 5 will be suspended and the group ID will be changed instead.
Send messages in your mailbox.

In this way, a stand-alone location beacon can be used to communicate messages between vehicles. Furthermore, since the roadside beacon according to the present invention has a mailbox function, it is possible to perform maintenance and inspection of the beer con. In other words, by writing the beacon's own data in a predetermined area of the mailbox memory allocated for maintenance, and assigning this maintenance mailbox ID as a group ID code to maintenance patrol cars running on the road, patrol cars can This maintenance data can be read automatically when the car passes under each beacon.

[Effects of the Invention] As described above in detail based on the embodiments, the present invention adds a mailbox function to a stand-alone roadside beacon that does not have an upper network, and sends mail using a group ID code transmitted from the vehicle. Since the box is accessed, messages can be exchanged between vehicles in a group rally or the like that follows the same course.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a roadside beacon according to an embodiment of the present invention, FIG. 2 is a diagram showing a schematic configuration of a conventional beacon, and FIG. 3 is a schematic diagram of a conventional individual communication beacon @
FIG. 4 is a diagram showing an example of the upper mat of the wireless frame 11 used in the embodiment of the present invention. In the figure, 1...vehicle; 3i1...wireless transmitter/receiver; 4...communication control unit l'' (C
CU), 5... Transmission data memory, 6...
...Mailbox memory, 10...Frame synchronization signal, 1] ...-1 time slot, 12
...Group ID code,]3...Group individual message data, 14...Downward time slot, 15...Return message data. Patent applicant: Oki Electric Industry Co., Ltd. Representative: Patent attorney: Takashi Kumagai (1 other person) To Mi-11 #Tomi b' (+-

Claims (2)

[Claims] (1) In a roadside beacon that exchanges data with a vehicle, a mailbox area is provided in the data storage area of the beacon to write or read data by accessing it using a group ID code transmitted from the vehicle. A roadside beacon characterized by the fact that it has been installed. (2) The data transmitted from the vehicle is in the group I
The roadside beacon according to claim 1, comprising a D code and a message to other vehicles belonging to the same group.