JPH01212134A - Radio communication system - Google Patents

Abstract

PURPOSE:To erase radio interference by providing the storing and identifying means of a code number to identify respective sub-radio equipments in a main radio communication equipment and providing a means to operate a transmission part and to transmit the code number to the main radio communication equipment when the code number to be received by the respective sub-radio equipments is the self-code number. CONSTITUTION:In the main radio communication equipment, the code number is received in a reception circuit 3 and demodulated by a demodulating circuit 5. After that, the code number is equipment sent to a code identifying circuit 6 and from which sub-radio communication equipment a transmission request is given is discriminated. The code number and transmission allowing code of the said sub-radio communication equipment are removed from a memory 11 and switched through a modulating circuit 8 and a transmission circuit 4 to a transmission side. Then, the communication goes to be stand-by to receive only transmission from the allowed sub-radio communication equipment. These code number and transmission allowing code are received in a reception circuit 23 by the sub-radio communication equipment and demodulated. After that, whether the codes are addressed to it self or not is discriminated and it is discriminated that the transmission allowance is obtained. Then, transmission information are sent from a microphone 32. Thus, the radio interference is prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a communication system between a master station, which is a main wireless communication device, and slave stations, which are a plurality of sub wireless communication devices, using a wireless line. To be more specific, a slave station makes a transmission request to the master station, and communication between them is enabled only when the master station approves the transmission, and the remaining slave stations are prevented from communicating with the master station. Related to wireless communication systems.

[Conventional technology]

When performing wireless communication between multiple points, a main wireless communication device is provided as one master station or base station, and a sub wireless communication device is arranged as a slave station or mobile station at a point other than the main wireless communication device, 2. Description of the Related Art A wireless communication system is provided in which communication is performed between a main wireless communication device and each sub-wireless communication device, or communication is performed between sub-wireless communication devices via the main wireless communication device. In such a wireless communication system, one wireless line is shared.

[Problem to be solved by the invention]

One wireless #1 line can be shared by various systems, for example,
When using fire waves for mobile stations, mobile stations, fire engines, etc., which are wireless devices such as mobile dynamic devices, radio siren devices, individual paging devices, simultaneous command devices, etc., if the mobile station arbitrarily transmits radio waves, If another station or device is using the wireless line, it may cause interference to the line, causing problems. Additionally, since wireless siren devices, individual paging devices, etc. are always in a state of receiving signals from the main wireless communication device, interference waves from these devices are more likely to be received than the radio waves of the main wireless communication device due to the location of these devices. may be strong. In such a case, the signal is masked and control from the main wireless communication device becomes impossible.

Therefore, an object of the present invention is to transmit data from a plurality of sub stations, which are sub radio communication devices, under the control of a master station, which is a main radio communication device, so that transmissions between the main radio communication device and the sub stations can be accurately communicated without interference. It is an object of the present invention to provide a communication system that enables communication between wireless communication devices or between sub wireless communication devices.

[Means for solving l11M] The present invention provides communication between a main wireless communication device that is a parent station and a plurality of sub radio devices that are slave stations located at remote locations with respect to the main wireless communication device. The main wireless communication device includes a storage means for storing a preset code number for identifying each sub-wireless device, a code identification means for identifying the code number, and a request for transmission. and a control means for controlling only the sub-radio device that has been set to enable communication,
Each sub radio device has a storage means for storing its own code number, a code identification means for identifying the code number from the main radio communication device, and operates a transmitter when the received code number is its own code number. The wireless communication device is characterized by comprising a control means for controlling the wireless communication device to transmit the received information to the main wireless communication device.

〔Example〕

An embodiment of the present invention shown in the drawings will be described below. First, referring to FIG. 1, the configuration of a main wireless communication device, which is a master station or base station, will be described. A receiving circuit 3 and a transmitting circuit 4 are connected via an antenna 1 and a changeover switch 2. As shown in FIG. Connected to the receiving circuit 3 are a code identification circuit 6 that reads a code number attached to each sub-wireless communication device via a demodulation circuit 5, and a speaker 7 that outputs the received signal as an audio signal. The transmission circuit 4 is connected to a central processing means (hereinafter referred to as C
(referred to as PU) 9 is connected.

The CPU 9 controls the operation of the transmitting circuit 4 so as to transmit the code number of the sub wireless communication device with which to communicate.

The code number and transmission permission code of the secondary wireless communication device are determined by the CPU.
9 is stored in the memory 11 connected to the computer 9.

A microphone 12 for audio input is connected to the modulation circuit 8 .

FIG. 2 shows the configuration of each sub-wireless communication device, in which the antenna 21 and changeover switch 22 are similar to the main wireless communication device.
The receiving circuit 23 and the transmitting circuit 24 are connected via
A code identification circuit 26 and a speaker 27 are connected to the receiving circuit 23 via a demodulating circuit 25, and a CPU 29 is connected to the transmitting circuit 24 via a modulating circuit 28. C
The PU 26 includes a code identification circuit 26. A transmitting circuit 24 and a modulating circuit 28 are connected, as well as a memory 31 that stores a local station code and a transmission permission code from the main wireless communication device. The modulation circuit 28 is connected to a microphone 32 and a press switch 33 that is turned on when pressed. Press switch 33 is connected to CPU 26.

Next, to explain the operation of this system and the functions of each component, each sub-wireless communication device is given a code number to identify it.These code numbers and the information of the corresponding sub-wireless communication device are assigned to each sub-wireless communication device. is the memory 11 of the main wireless communication device.
Remember it. The memory 31 of each sub-wireless communication device stores its own code number and also stores a preset transmission permission code. This transmission permission code is also stored in the memo January 1 of the main radio communication device. If you want to send it from the sub radio communication device to the main radio communication device, first press the press switch 33. As a result, the CPU 29 reads out the self code and the transmission request code from the memory 31, and reads out the changeover switch 22 and the antenna 21 from the transmission circuit 24.
These code signals are transmitted to the antenna 1 of the main radio transmitter via.

On the main wireless communication device side, these code signals are received by a receiving circuit 3, demodulated by a demodulation circuit 5, and then sent to a code identification circuit 6, which determines which sub wireless communication device has issued the transmission request. If it is not transmitting with other secondary radio transmitters,
The CPU 9 is operated to retrieve the code number and transmission permission code of the corresponding sub-wireless communication device from the memory 11, and the code is switched to the transmission side via the modulation circuit 8 and the transmission circuit 4, passes through the switch 2, and is transmitted from the antenna 1. At the same time, C
The PU 9 waits to receive only transmissions from authorized secondary wireless communication devices. The secondary wireless communication device receives this code number and transmission permission code at the reception circuit 23, demodulates it at the demodulation circuit 25, and then determines whether it is its own code at the code identification circuit 26 and confirms that transmission permission has been granted. Determine. Then, while pressing the press switch 33, press the microphone 3
Send the information you need to convey from 2. This information is received by the primary radio. If you want to communicate with the main radio communication device again after getting the answer from the main radio communication device, you will receive transmission permission from the main radio communication device again in the same manner as described above.

In this state, even if another sub-wireless communication device calls the main wireless communication device, the communication between the main wireless communication device and the sub-wireless communication device is locked and no communication is possible.

The communication between the sub wireless communication devices can be carried out by interposing the main wireless communication device between them, and the transmission permission code can be received while being passed in the same way as described above.

The above embodiment takes as an example the breath talk method in which transmission is performed by pressing the press switch 33, but in two-way communication: - After receiving transmission permission from the mutual wireless communication device, until the communication ends; , it may be locked to prevent communication with other secondary wireless communication devices.

〔Effect of the invention〕

As described above, in the wireless communication system of the present invention, when a sub-wireless communication device desires to transmit, the main wireless communication device transmits a transmission permission code to the sub-wireless communication device, and the sub-wireless communication device receives this code. Since it is not possible to transmit unless a transmission permission code is received, even if other secondary radio transmitters try to transmit in this state, they will not be able to transmit, and the main radio transmitter and the secondary radio transmitter that are communicating will be interfered with. It is possible to prevent interference with that communication. In addition, the main wireless communication device always knows the status of the communication line, allowing accurate communication control.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a main wireless communication device in an embodiment of the present invention, and FIG. 2 is a block diagram showing the configuration of a sub wireless communication device thereof. In the drawing, 1 and 21 are antennas, 2 and 22 are changeover switches, 3 and 23 are receiving circuits, 4 and 24 are transmitting circuits,
5, 25 are demodulation circuits, 6, 26 are code identification circuits, 7,
27 is a speaker, 8, 28 is a modulation circuit, 9°29 is a CP
U, 11, 31 is memory, 12.32 is microphone,
33 is a press switch. Patent applicant: Fujitsu General Co., Ltd. Patent attorney: Takuya Ohara

Claims (3)

[Claims] (1) A wireless communication system that performs communication between a main radio communication device that is a master station and a plurality of sub radio devices that are slave stations located at remote locations with respect to the main radio communication device, wherein the main radio communication device The radio communication device includes a storage means for storing a preset code number for identifying each of the sub radio devices, a code identification means for identifying the code number, and only the sub radio device requested to transmit. and a control means for controlling to enable communication, each of the sub radios having a storage means for storing its own code number, and a code identification means for identifying the code number from the main radio communication device. , a control means for operating a transmitting unit and controlling the received code number to transmit to the main radio communication device when the received code number is its own code number. Communications system. (2) Preset transmission permission codes are stored in the storage means of the main radio communication device and each of the sub radio devices, respectively;
The control means of the main radio communication device controls the transmission permission code to be transmitted together with the code number of the sub radio device of the other party when transmission is possible, and the control means of each of the sub radio communication devices controls the transmitting permission code. 2. The wireless communication system in a wireless communication device according to claim 1, wherein control is performed to identify whether transmission is possible based on reception of a permission code. (3) Each of the sub radios is equipped with a press switch that turns transmission on and off, and each sub radio is controlled so that it waits for reception of the transmission permission code from the main radio communication device before transmitting. 3. The wireless communication system in a wireless communication device according to claim 1, wherein the means controls.