JPH0444428A - Wireless communication method - Google Patents

Abstract

PURPOSE:To realize data transmission and reception between a device of a master station and a device of a slave station by generating a transmission data comprising a slave station recognition number of its own station and lots of data added to a master station recognition number in an optical signal, sending the data on a weak radio wave available for a wide range of communication and allowing the master station to receive the radio wave based on a master station recognition number of its own station. CONSTITUTION:A slave side transmission data uses an ID number of a master station being a header of a reception data as a header, a car body ID number of its own car body inputted and set from an ID setting section 27 is added to a data position next to the header to form one data block and a weak radio wave with a power to be reached to an master station device 11 radiates in an omnidirectional way. The weak radio wave radiating in this way is received by a reception antenna 24 at the side of the master station device 11, then it is recognized and discriminated that the reception data is a reply from a slave station device with respect to an optical signal sent from its own light transmission section 23 based on the master station ID number being the header.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a wireless communication system for transmitting signals between slave stations mounted on a plurality of vehicles and a plurality of master stations fixedly installed on the ground. Regarding.

[Prior Art] Conventionally, on-vehicle equipment mounted on a moving object such as a plurality of vehicles,
When performing two-way communication between multiple ground devices fixedly installed on the ground, communication media that use weak radio waves or optical signals that are transmitted through space are generally known.

[Problem to be solved by the invention] In the two-way communication using the weak radio waves described above, the radio waves are non-directional and it is difficult to limit the communication range, and there are multiple on-board devices within the communication range. Therefore, it is necessary to take software measures such as sequentially polling each on-board device from the ground device. However, there are limits to polling, and communication becomes difficult when the number of on-board devices increases.

Furthermore, in bidirectional communication using optical space transmission, in order to ensure a wide communication range, it is necessary to increase the light emission output of the light emitting section, which is disadvantageous in terms of cost. Therefore,
Normally, the communication range is limited and data communication is performed with a small light output, but this poses a problem in that it imposes restrictions on the amount of data that can be communicated.

The present invention was made in view of the above-mentioned circumstances, and its purpose is to provide a wireless communication system that can transmit a large amount of data from a large number of on-board devices to a plurality of ground devices. There is a particular thing.

[Means and effects for solving the problem, that is, the present invention provides for each of a plurality of master station devices fixedly installed on the ground,
A master station side setting section that sets an identification number indicating the address of the own station, a light transmitting section that irradiates an optical signal using the identification number set by this master station side setting section in a beam range limited to a mobile object path, and the own station. The configuration includes a receiving section that selectively receives weak radio waves with an identification number indicating the address of the mobile station, and an identification number indicating the address of the own station is set for each of the plurality of slave station devices mounted on the mobile body. A slave station setting section, a light receiving section that receives the emitted optical signal, and in response to the optical signal received by this light receiving section, the identification number of the master station in the optical signal and the identification number by the slave station setting section. An optical space with a limited beam range from the master station device, which has a configuration that includes a control means that outputs transmission data including Through transmission, an optical signal with the identification number of the master station is sent, and this optical signal is received and demodulated by a slave station device mounted on a mobile object, such as a vehicle, that passes within the beam range, and the parent station in the optical signal is Create transmission data that includes the station identification number, your own station's slave station identification number, and various types of data, transmit it using weak radio waves that can communicate over a wide range, and send this weak radio wave to your own station's master station identification number using the master station equipment. By receiving data based on the above, it is possible to send and receive data between the master station device and slave station devices, making it possible to send large amounts of data from multiple on-board devices to multiple ground devices. .

[Example] An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 shows the circuit configuration of the master station device and the slave station device.In reality, there may be multiple master station devices and slave station devices, or the configurations of each device are the same, so here we will explain it here. Now, explanation will be given using only the − set.

In the figure, reference numeral 11 indicates a master station device fixedly installed near the passage of the vehicle, and reference numeral 12 indicates a master station device mounted on a moving vehicle.
It is a slave station device that performs data communication with.

The master station device II includes a control unit 21 that controls the operation of each circuit in the master station device 11, and a recognition (
ID) ID setting unit 22 for inputting and setting a number, a light transmitting unit 23 that transmits an optical signal with a beam width within a specific range, and weak radio waves from a slave station device 12 mounted on a vehicle moving on a specific path. The receiving antenna 24 receives the radio wave data, and the receiving section 25 demodulates the radio wave data obtained by the receiving antenna 24 and sends it to the control section 2.

On the other hand, the slave station device 12 includes a control unit 26 that controls the operation of each circuit within the slave station device 12, and a vehicle recognition system for the vehicle in which the slave station device 12 is installed. (ID) number and other data are set manually; a light receiving unit 28 that receives optical signals; a transmitting unit 29 that modulates data to be transmitted to the master station device 11 and excites the transmitting antenna 30. , transmitter 29
The transmitting antenna 30 is configured to transmit weak radio waves by being excited by the transmitting antenna.

In such a configuration, the control unit 21 on the master station device ll side
creates master station data according to its own ID number input and set in the ID setting section 22, and sends this to the light transmitting section 23.

FIG. 2(a) shows the structure of the transmission data from the master station.

That is, the master station side transmission data constitutes one data block by using the ID number of the master station as a header, followed by adding ground data stored in advance in the control unit 21.

The light transmitting unit 23, which receives the master station data from the control unit 2I, is installed in advance so that the beam range is directed to a limited part of the vehicle path, and modulates the transmitted master station data to transmit light. A signal is generated and transmitted within the beam range. This data transmission operation by the light transmitting section 23 is continuously and repeatedly performed.

Assume that while the optical signal is continuously and repeatedly transmitted within the beam range thus limited, a vehicle such as a truck carrying the slave station device 12 passes through the beam range. In this case, the light receiving unit 28 of the slave station device 12 demodulates only complete data blocks.

The control unit 26 on the side of the slave station device 12 performs error correction processing on the received data to determine whether the data is correct or not, and then determines whether or not a response is necessary based on the content of the received data. If it is determined that a response is necessary, it creates transmission data to the master station device 11 and sends it to the transmission section 29.

FIG. 2(b) shows the structure of the transmission data on the slave station side created by the control section 26 at this time. In other words, the slave station side transmission data is the master station's I
The D number is left as is, and the vehicle ID number of the own vehicle input and set from the ID setting section 27 is added to the next position, followed by the vehicle type data of the own vehicle stored in the control section 26 in advance. , vehicle data consisting of specified weight data, etc. are added to form one data block.

The transmitter 29 receives the slave station data from the controller 26, modulates the slave station data, excites the transmitting antenna 30, and transmits omnidirectional weak radio waves with enough power to reach the master station device 11. . The data transmission operation by the light transmitting unit 23 is continuously performed a specific number of times, for example, three times.

This number of times is set in advance for both the master station device 11 and the slave station device 12 so that data transmission can be performed reliably while limiting communication time.

The weak radio waves transmitted in this manner are received by the receiving antenna 24 on the side of the master station device 11, demodulated by the receiving section 25, and sent to the control section 21. After performing error correction processing on the received data to determine whether the data is correct or incorrect, the control unit 21 determines whether the received data is an optical signal transmitted from its own light transmitting unit 23 or It recognizes and determines that it is a response from the slave station device 12 to the signal. and,
When determining that it is a response to an optical signal emitted by itself, the vehicle I, D number, and vehicle data following the header are taken in and stored in storage means (not shown). The accumulated data will later be used for managing vehicle operating conditions and for statistical processing.

In the above embodiment, it is assumed that the amount of data transmitted from the slave station device 12 to the master station device 11 is larger than the amount of data transmitted from the master station device 11 to the slave station device 12.
Although data is transmitted from the slave station device 12 to the master station device 12 by optical space transmission, and from the slave station device 12 to the master station device 11 by weak radio waves, for example, in the configuration of a navigation system that indicates a destination, etc. , Master station device 1
Since the amount of data transferred from the slave station device 1 to the slave station device 12 is larger, the configuration of the master station device 11 and the slave station device 12 shown in FIG. It is also conceivable to transmit data to the station device 11 by optical space transmission and, in response, to transmit data from the master station device 11 to the slave station device 12 by weak radio waves.

The operation in the case of such a configuration will be described below as another embodiment.

Figure 3 shows the data structure at this time.
Figure a) shows the structure of data transmitted on the slave station side.

That is, the slave station side transmission data constitutes one data block by using the ID number of the slave station device 12 as a header, followed by adding vehicle data stored in advance in the control unit.

The light transmitting unit that receives the slave station data from the control unit is installed in advance so that the beam range is oriented in a specific direction with respect to the traveling direction of the vehicle path, and modulates the transmitted slave station data and transmits the light. A signal is generated and light is transmitted in the specific direction. This data transmission operation by the light transmitting section is continuously and repeatedly performed.

As the vehicle travels along the path while optical signals are continuously and repeatedly transmitted in the specified direction, the main station device 11 is fixedly installed near the path. The optical signal is received by the light receiving section.

The #J control unit on the master station device II side performs error correction processing on the received data to determine whether the data is correct or not, and then determines whether a response is necessary or not based on the content of the received data. If it is determined that a response is necessary, slave station device 1
2 and sends it to the transmitter.

FIG. 3(b) shows the structure of the transmission data on the master station side that is created by the control section at this time. In other words, the data transmitted from the master station includes the vehicle ID of the slave station, which is the header of the received data.
Use the number as it is as a header, add the ID number of the master station input and set from the ID setting section to the next position, and then add ground data consisting of destination instructions etc. to create one data block. It consists of

The transmitting section receives the master station data from the control section, modulates the master station data, excites the transmitting antenna, and transmits weak radio waves that are omnidirectional and have enough power to reach the slave station device 12. This data transmission operation by the light transmitting unit is continuously performed a specific number of times.

This number of times is set in advance for both the master station device 11 and the slave station device 12 so that data transmission can be performed reliably while limiting communication time.

The weak radio waves transmitted in this manner are received by the receiving antenna on the slave station device 12 side, demodulated by the receiving section, and sent to the control section. The control unit performs error correction processing on the received data to determine whether the data is correct or not, and then uses the master station ID number in the header to identify whether the received data is a slave to the optical signal transmitted from its own light transmitting unit. Recognizes and determines that the response is from station equipment. When it determines that it is a response to an optical signal emitted by itself, the master station ID following the header is
It takes in the number and the contents of the ground data, and performs navigation display etc. according to the contents of the instruction.

[Effects of the Invention] As described in detail above, according to the present invention, a master station side setting unit that sets an identification number indicating the address of the own station for each of a plurality of master station devices fixedly installed on the ground; It has a light transmitting unit that irradiates an optical signal using an identification number from a side setting unit in a beam range limited to a path through which a mobile object passes, and a receiving unit that selectively receives weak radio waves with an identification number indicating the address of the own station. On the other hand, each of a plurality of slave station devices mounted on a mobile body has a slave station side setting section that sets an identification number indicating the address of the own station, a light receiving section that receives the emitted optical signal, and this light receiving section. control means for outputting transmission data including the identification number of the master station in the optical signal and the identification number by the slave station side setting section in response to the optical signal received by the control means; The configuration includes a transmitter that modulates and transmits omnidirectional weak radio waves, and transmits an optical signal with the identification number of the master station from the master station equipment through optical space transmission with a limited beam range, and transmits an optical signal with the identification number of the master station within the beam range. This optical signal is received and demodulated by a slave station device mounted on a passing moving object, such as a vehicle, and the transmitted data is created by adding the slave station identification number of the own station and various data to the master station identification number in the optical signal. The data between the master station device and the slave station device is transmitted by creating a weak radio wave that can be communicated over a wide range, and receiving this weak radio wave at the master station device based on the master station identification number of the own station. Since the transmission and reception of data has been realized, it is possible to provide a wireless communication system that allows large amounts of data to be transmitted from a large number of on-board devices to a plurality of ground devices.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the circuit configuration of one embodiment of the present invention, Fig. 2 is a diagram showing the structure of data blocks transmitted between the circuits of Fig. 1, and Fig. 3 is a block diagram showing the structure of data blocks transmitted between the circuits of Fig. FIG. 2 is a diagram showing the structure of a data block. II... Master station device, 12... Slave station device, 21.26.
...Control unit, 22, 27...ID setting unit, 23...Light transmitting unit, 24...Receiving antenna, 25...Receiving unit, 28
- Light receiving section, 29... Transmitting section, 30... Transmitting antenna. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] A first setting unit that sets an identification number indicating the address of the own station, and irradiates an optical signal using the identification number by this master station setting unit in a beam range limited to a path through which a moving object passes. A plurality of first transmitting/receiving devices each having a light transmitting unit and a receiving unit that selectively receives weak radio waves with an identification number indicating the address of the own station; and a second setting for setting the identification number indicating the address of the own station. a light-receiving unit that receives the irradiated optical signal; and a light-receiving unit that responds to the optical signal received by the light-receiving unit and identifies the identification number of the first transmitting and receiving device in the optical signal and the identification number by the second setting unit. and a plurality of second transmitting and receiving devices each having a transmitter that modulates the transmit data outputted by the control means and transmits omnidirectional weak radio waves. wireless communication method.