JPH0964802A - Radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication system in which communication between two slave stations among plural slave stations is realized using two communication channels through a master station with an economical configuration. SOLUTION: Each of plural slave stations 10 (suffix is abbreviated) includes a transmitter 11 to send a slave station transmission signal to an incoming communication channel. A master station 20 includes a microphone 23 generating a designation signal to designate any of the plural slave stations 10 to be a transmission enable station, a receiver 21 to receive the slave station transmission signal as a master station reception signal from the incoming communication channel, an adder 24 adding the designation signal and the master station reception signal, and a transmitter 22 to send the added signal to an outgoing communication channel as the master station transmission signal. Each slave station 10 includes a receiver 13 to receive the master station transmission signal as the slave station reception signal from the outgoing communication channel and the transmitter 11 of each slave station 10 sends the slave station transmission signal upon the receipt of the designation signal designating its own slave station as the transmission enable station by the receiver 13 to its own station.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system, and more particularly to a multi-site one-system wireless communication system including a plurality of wireless stations.

[0002]

2. Description of the Related Art As a conventional multi-location one-system wireless communication system, there is a system for performing point-to-point communication between a plurality of wireless stations in a time division system. However, this method is not economical because a plurality of wireless stations require complicated circuit devices to achieve the time division method. In addition, a wide band is required to transmit the multiplexed signal.

As another conventional multi-point one-system wireless communication system,
There is a method of performing point-to-point communication by securing communication channels independent of each other between multiple wireless stations. However, in this method, as shown in FIG. 4, for example, when performing multi-point one-system wireless communication between four wireless stations A, B, C, and D, between A and B, between A and C, and A and Between D, B and C
Six communication channels must be reserved between the two, B and D, and C and D. Therefore, each wireless station requires a circuit device for controlling switching of a plurality of communication channels, which is not economical. Further, such control of switching of communication channels becomes complicated as the number of communication channels increases, which requires complicated control of the circuit device for controlling the switching of communication channels, which is also not economical. Moreover, it cannot be realized unless a large number of communication channels are secured.

[0004]

Generally, the satellite communication system includes a plurality of small stations and a large station, and the communication between the small stations is two-hop communication via the large station. In such a case, a direct communication channel is not secured between the small stations. This satellite communication system uses a transponder installed in a communication satellite. Two communication channels are required to use the transponder because it acts as a repeater to frequency convert a received signal of a given frequency into a converted signal of another frequency. In order to share these two communication channels among a plurality of small stations, time division multiplex communication is usually adopted. Therefore, even in this system, a plurality of small stations require complicated circuit devices to achieve time division multiplex communication. In addition, a wide band is required, the usage fee of the transponder is high, and it is not economical.

Therefore, an object of the present invention is to provide an economical wireless communication system.

Another object of the present invention is to include a plurality of slave stations and one master station as a wireless communication station, and to communicate between two of the plurality of slave stations via the master station. It is an object to provide a wireless communication system realized by using a communication channel as an economical configuration.

[0007]

According to one aspect of the present invention, there are provided first to N-th (N is an integer of 2 or more) slave stations and one master station, and the first to the first In a wireless communication system for realizing communication between two of N slave stations by using two communication channels via the master station, each of the first to Nth slave stations includes: A master station that includes a slave station transmitter that transmits a slave station transmission signal to an upstream communication channel of the two communication channels, wherein the master station receives the slave station transmission signal as a master station reception signal from the upstream communication channel. A receiver and a master station transmitter that is connected to the master station receiver and transmits the master station reception signal as a master station transmission signal to a downlink communication channel of the two communication channels; Each of the N slave stations transmits the master station transmission signal to the downlink communication. Wireless communication method further comprising a slave station receiver for receiving a channel slave station reception signal is obtained.

According to another aspect of the present invention, first to Nth
(N is an integer of 2 or more) and one master station, and communication between two of the first to Nth slave stations is performed.
In a wireless communication method for realizing using two communication channels via the master station, the first to Nth communication methods are provided.
Each of the slave stations includes a slave station transmitter that transmits a slave station transmission signal to an upstream communication channel of the two communication channels, and the master station is one of the first to Nth slave stations. And a master station receiver for receiving the slave station transmission signal as a master station reception signal from the upstream communication channel, and a permission generating means. An adder connected to the master station receiver, adding the transmission-permitted station designating signal and the master station reception signal, and outputting an added signal, and the adder connected to the adder and adding the signal And a master station transmitter that transmits the master station transmission signal to the downlink communication channels of the two communication channels, wherein each of the first to Nth slave stations transmits the master station transmission signal to the downlink communication channel. From slave station received signal Further includes a slave station receiver for receiving the slave station transmitter of each of the first to Nth slave stations, wherein the slave station receiver of the local station is the local station as the transmission-permitted station. A wireless communication system is obtained in which, when the designated transmission permitted station designation signal is received as the slave station reception signal, the slave station transmission signal is transmitted to the upstream communication channel.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 1, a multi-site one-system wireless communication system according to a first embodiment of the present invention is composed of first to N-th (where N is 2).
(Integer above) slave stations 10-1 to 10-N and one master station 2
0, and is used to realize communication between two of the first to Nth slave stations 10-1 to 10-N using two communication channels via the master station 20. is there.

Each of the first to Nth slave stations 10-1 to 10-N transmits a slave station transmission signal to an upstream communication channel of the two communication channels, and a slave station transmitter (TX) 11 therein.
And a microphone (slave station voice signal generator) 12 connected to the slave station transmitter 11 and generating a communication voice signal as a slave station transmission signal.

The master station 20 receives a slave station transmission signal from the upstream communication channel as a master station reception signal (R station receiver (R
X) 21 and a master station transmitter (TX) 22 connected to the master station receiver 21 and transmitting the master station reception signal as a master station transmission signal to the downlink communication channels of the two communication channels.
And

Each of the first to Nth slave stations 10-1 to 10-N receives a master station transmission signal as a slave station reception signal from a downlink communication channel, and a slave station receiver (RX) 13 and the slave stations. A speaker (slave station reception signal / speech conversion device) 14 that is connected to the station receiver 13 and converts a slave station reception signal into communication voice
It also includes and.

In this wireless communication system, the slave station transmitter 11 of each of the first to Nth slave stations 10-1 to 10-N.
In order to avoid transmitting the slave station transmission signal to the upstream communication channel at the same time, the first to Nth slave stations 1
When the other slave stations 0-1 to 10-N are not transmitting the slave station transmission signal to the upstream communication channel, the slave station transmission signal is transmitted to the upstream communication channel.

At this time, the first to Nth slave stations 10-1 to 10-1
In each of the 0-N slave station transmitters 11, the slave station receivers 13 of the first to Nth slave stations 10-1 to 10-N send the master station transmission signal from the downlink communication channel to the slave station reception signal. Is not received (that is, the first to Nth slave stations 10-1 to 10-1.
When each speaker 14 of 10-N is not outputting communication voice), the other slave stations of the first to Nth slave stations 10-1 to 10-N transmit the slave station transmission signal to the upstream communication channel. If not, the slave station transmission signal is transmitted to the upstream communication channel.

In FIG. 1, the second slave station 10-
2 transmits the slave station transmission signal to the upstream communication channel, the master station 20 receives the slave station transmission signal from the upstream communication channel as a master station reception signal, and uses the master station reception signal as the master station transmission signal to the downstream communication channel. It shows the status of transmission. As described above, when the master station 20 receives the slave station transmission signal from the upstream communication channel as the master station reception signal, the master station 20 transmits the master station reception signal as the master station transmission signal to the downlink communication channel, whereby the first to the first communication channels are transmitted. N slave stations 10-1 to 1
This means that the master station transmission signal is being broadcast to 0-N.

Referring to FIG. 2, the multi-site one-system wireless communication system according to the second embodiment of the present invention is similar to the wireless communication system of FIG. 1 except as described below.

That is, the master station 20 is the first to Nth slave stations 1
In order to prevent the 0-1 to 10-N slave station transmitters 11 from simultaneously transmitting slave station transmission signals to the upstream communication channel, any one of the first to Nth slave stations 10-1 to 10-N It further includes a microphone (permission generation device) 23 for generating a transmission permission station designation signal for designating one as a transmission permission station. Specifically, this microphone 23 is issued by the operator of the master station 20 when needed, "First, the first slave station should transmit." Or "Next, the second slave station should transmit." , Etc. is converted into a permission voice signal, and this permission voice signal is generated as a transmission permission station designation signal. The master station 20 includes a microphone 23 and a master station receiver 2
1, which is connected to the transmission permission station designation signal and the master station receiver 21.
It further includes an adder 24 that adds the received signal from the master station and outputs the added signal. The master station transmitter 22
Connected to the adder 24, the added signal is transmitted to the downlink communication channel as a master station transmission signal.

The master station 20 is connected to a master station receiver 21,
It further includes a speaker (master station reception signal / voice converter) 25 for converting the master station reception signal into communication voice. Master station 20
The operator, while monitoring the communication voice emitted from the speaker 25, inputs the permission voice such as the above-mentioned "Please transmit by the second slave station" to the microphone 23 when necessary.

In FIG. 2, the second slave station 10-
2 transmits the slave station transmission signal to the upstream communication channel, the master station 20 receives the slave station transmission signal from the upstream communication channel as a master station reception signal, and uses the master station reception signal as the master station transmission signal to the downstream communication channel. It shows the status of transmission. At this time, the master station transmits, for example, a signal obtained by adding a transmission-permitted station designation signal representing a permission voice "Next, the third slave station should transmit" to the master station reception signal. It can be transmitted as a signal to the downlink communication channel. As described above, when the master station 20 receives the slave station transmission signal from the upstream communication channel as the master station reception signal, the master station 20 transmits the master station reception signal as the master station transmission signal to the downlink communication channel, whereby the first to the first communication channels are transmitted. N slave stations 10-1 to 1
This means that the master station transmission signal is being broadcast to 0-N.

That is, the first to Nth slave stations 10-1 to 10
The communication from each of the -N to the master station 20 corresponds to point-to-point communication, and the master station 20 transmits the first to Nth slave stations 10-1 to 10-1.
Communication to 10-N corresponds to broadcasting.

Referring to FIG. 3, there is shown a system configuration equivalent to the multi-site one-system wireless communication system of FIGS.
The illustrated system is a case including four slave stations A, B, C, D and one master station. Thus, it is not necessary to directly secure a communication channel between the slave stations.

According to the multi-site 1-system wireless communication system of FIGS. 1 and 2 described above, multi-site 1-system communication can be realized by the same two communication channels as full-duplex communication. Furthermore, it is possible to realize multi-site one-system communication that does not require that a communication channel be directly secured between the slave stations.

[0024]

As described above, according to the present invention,
In a wireless communication system including a plurality of slave stations and one master station, communication between two of the plurality of slave stations can be realized using the two communication channels via the master station, and it is economical. There is an effect that it can be achieved with a simple configuration.

[Brief description of drawings]

FIG. 1 is a block diagram of a multi-location one-system wireless communication system according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a multi-location one-system wireless communication system according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a system configuration equivalent to the multi-location one-system wireless communication system of FIGS. 1 and 2.

FIG. 4 is a block diagram of a conventional multi-location one-system wireless communication system.

[Explanation of symbols]

 10-1 First Slave Station 10-2 Second Slave Station 10-N Nth Slave Station 11 Slave Station Transmitter (TX) 12 Microphone (Slave Station Voice Signal Generator) 13 Slave Station Receiver (RX) 14 speaker (slave station reception signal / speech converter) 20 master station 21 master station receiver (RX) 22 master station transmitter (TX) 23 microphone (permission generation device) 24 adder 25 speaker (master station reception signal / speech) Converter)

Claims (6)

[Claims] 1. Communication between two of the first to Nth slave stations is included, including first to Nth slave stations (N is an integer of 2 or more) and one master station. In the wireless communication method for realizing by using two communication channels via the master station, each of the first to Nth slave stations transmits a slave station transmission signal to upstream communication of the two communication channels. A slave station transmitter for transmitting to a channel, the master station is a master station receiver for receiving the slave station transmission signal as a master station reception signal from the upstream communication channel, and is connected to the master station receiver, A master station transmitter that transmits a master station reception signal to a downlink communication channel of the two communication channels as a master station transmission signal, wherein each of the first to Nth slave stations transmits the master station transmission signal. Received as a slave station reception signal from the downlink communication channel A wireless communication system further comprising a slave station receiver. 2. The slave station transmitter of each of the first to Nth slave stations is configured to prevent the slave station transmitter from simultaneously transmitting the slave station transmission signal to the uplink communication channel.
To transmit the slave station transmission signal to the uplink communication channel when another slave station of the Nth slave station is not transmitting the slave station transmission signal to the uplink communication channel. The wireless communication method described in 1. 3. The slave station transmitter of each of the first to Nth slave stations is configured so that the slave station receiver of each of the first to Nth slave stations receives the master station transmission signal. When it is not received as the slave station reception signal from the downlink communication channel, it is determined that another slave station of the first to Nth slave stations is not transmitting the slave station transmission signal to the uplink communication channel. The wireless communication system according to claim 2, wherein the slave station transmission signal is transmitted to the upstream communication channel. 4. Each of the first to N-th slave stations,
A slave station voice signal generating means that is connected to the slave station transmitter and generates a communication voice signal as the slave station transmission signal, and a slave that is connected to the slave station receiver and converts the slave station reception signal into communication voice. 4. The wireless communication system according to claim 1, further comprising station reception signal / voice conversion means. 5. A communication between two of the first to Nth slave stations is included, which includes first to Nth slave stations (N is an integer of 2 or more) and one master station. In the wireless communication method for realizing by using two communication channels via the master station, each of the first to Nth slave stations transmits a slave station transmission signal to upstream communication of the two communication channels. A master station including a slave station transmitter for transmitting to a channel, and the master station generating a permission-permitted station designating signal for designating one of the first to Nth slave stations as a transmission-permitted station; A master station receiver for receiving the slave station transmission signal from the upstream communication channel as a master station reception signal, and the permission generation means and the master station receiver, and the transmission permission station designation signal and the master station. An adder that adds the received signal and outputs the added signal, A master station transmitter connected to the adder for transmitting the added signal as a master station transmission signal to a downlink communication channel of the two communication channels, each of the first to Nth slave stations. Further includes a slave station receiver that receives the master station transmission signal from the downlink communication channel as a slave station reception signal, wherein each of the slave station transmitters of the first to Nth slave stations is its own station. When the slave station receiver receives the transmission permission station designation signal designating itself as the transmission permission station as the slave station reception signal, the slave station transmission signal is transmitted to the upstream communication channel. A wireless communication system characterized by: 6. Each of the first to N-th slave stations,
A slave station voice signal generating means that is connected to the slave station transmitter and generates a communication voice signal as the slave station transmission signal, and a slave that is connected to the slave station receiver and converts the slave station reception signal into communication voice. Further comprising a station reception signal / speech conversion means, wherein the master station is further connected to the master station receiver and further comprises a master station reception signal / speech conversion means for converting the master station reception signal into communication voice, 6. The wireless communication system according to claim 5, wherein the permission generation means generates a permission voice signal as the transmission permission station designation signal.