JPS5846897B2 - Simplex wireless communication system - Google Patents

Description

Detailed Description of the Invention (Field of Technology) The present invention relates to a simplex wireless communication method in which communication is performed between a base station or relay station wireless device and a plurality of slave station wireless devices by sharing one radio wave. This relates to communication blockage and release methods.

(Prior Art) A conventional simplex wireless communication system will be explained with reference to FIG.

In Figure 1, 1 is the radio device of the master station or relay station, 2, 3
...N indicates a slave station radio, and A indicates a radio wave.

In such a simplex wireless communication system, as is well known, only one radio wave is transmitted.

Therefore, if the radio of a master station or relay station (hereinafter referred to as the master station) and one slave station radio (hereinafter referred to as a slave station) are communicating, the other slave stations will wait until the communication is completed. That will happen.

For example, when master station 1 and slave station 2 are communicating, slave stations 3 to N wait for communication.

Conventionally, the methods in which other slave stations wait for communication can be broadly classified into the following three methods.

The first is an agreement between wireless device users that they will not communicate while someone else is communicating, and none of the slave stations has the ability to block communication, so it is possible for other users to communicate. The only thing that can be done is to intercept or display it, and only to carry it out in a polite manner.

This is generally called a voice calling method.

Naturally, communications cannot be kept confidential, and if agreements are not followed, there is no way to prevent interference.

On the other hand, from the standpoint of interrupt communication from a slave station, it is free, but if there are many interrupters at the same time, complete interference will occur.

Second, the master station sends out a selection signal to select the slave station with which it communicates, and all slave stations other than the slave station with which it communicates are blocked by that signal, and cannot communicate until a blockage release signal is sent. This method is called the selective calling method.

This is generally achieved by a function in which the slave station determines whether the selected signal is its own signal or not, and opens or closes the communication channel.

In this method, until the block release signal is received, all slave stations other than those that are communicating cannot communicate, and even if a slave station tries to interrupt in an emergency, it is not possible, and as soon as the block release signal is received, a large number of slave stations can communicate at the same time. If you start sending out messages, it will cause confusion.

For example, when slave station 2 communicates in FIG. 1, a selection signal for selecting slave station 2 is sent from master station 1.

This signal is selected from the master station when the master station is aware of the transmission, as well as when the slave station is connected.

The slave station 2 that receives the selection signal determines that it has been selected and enters a communication state, but the other slave stations 3 to N determine that the signal does not select them and enter a blocked state.

When the communication of the slave station 2 is completed, a block release signal is sent from the master station '', and all the slave stations 3 to N receive the signal and return to the communicable state.

Therefore, as mentioned above, while slave station 2 is communicating, slave station 3
It is impossible to communicate from ~N even if an emergency situation occurs.

Furthermore, when the blockage release signal is received, the slave stations 3 to N are released at the same time, so if a large number of slave stations that want to communicate are waiting, they will start transmitting all at once and things will become uncontrollable.

This type of wireless communication system is often used for disaster prevention radio and emergency radio, and there is an important possibility of simultaneous transmission.

Also, unless a blockage release signal is received, a blocked slave station will not be unblocked, so if the slave station is in a reception dead zone, etc.
For example, if the slave station is a mobile wireless slave station and is in a tunnel, etc., the block release signal cannot be received, and only that slave station cannot communicate.

(Object of the Invention) In order to eliminate these drawbacks, it is an object of the present invention to provide a system in which the slave station itself automatically releases the blockage for a certain period of time among the selected signal systems.

(Structure of the Invention) The present invention provides a simplex wireless communication method in which communication is performed between a master station or relay station radio and a plurality of slave station radios using one radio wave. On the other hand, a selection signal is sent from the master station or relay station radio, and the slave station radios other than those for communication are blocked by the signal, and after receiving the signal, the slave station radios themselves release the blockage and communicate. Interrupt communication from the slave station is possible during the transmission, and the first invention is characterized in that the release of the slave station radio itself is carried out after a predetermined time period that differs for each slave station radio device has elapsed.
In the invention, the simplex wireless communication system is characterized in that each slave station radio device releases itself randomly after a certain period of time has elapsed.

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Normally, such a simplex wireless communication system is often used for disaster prevention and emergency wireless communication as described above, and the communication time of this type of communication is usually about 10 to 20 seconds per communication.

In other words, in most cases, necessary and sufficient information is transmitted within that time.

Therefore, instead of unblocking the communication after the unblocking signal is sent from the master station as in the past, we set a certain time that differs for each slave station based on this time of 10 to 20 seconds, and after that time elapses, Or each slave station radio randomly after a certain period of time,
If the slave station does this automatically, it will be able to transmit the necessary and sufficient information in most cases, and interrupt communication from the slave station for emergency communications will also be possible.
This can be done without having to wait until one communication ends, and confusion can be prevented.

The present invention is a system realized based on this idea, and the system will be explained based on FIG. 1, and an embodiment of a slave station radio device for realizing the present invention will be explained with FIG.

In the simplex wireless communication system, when communication is to be performed, the master station 1 sends out a selection signal for selecting a target slave station, for example 2.

The selection signal is received by all slave stations 2 to N, but each slave station determines whether or not the signal is from its own station.Only the slave station that has been determined to be its own station, for example 2, enters the communication state and For example, the slave stations 3 to N that are determined not to be able to communicate with each other are placed in a blocked state.

This is also done in the conventional selection signal system, but conventionally, in order to release the blockage, one communication, in this case, after the communication of the slave station 2 is completed, the blockage release signal is sent from the master station. It was lifted for the first time.

The present invention eliminates the blockage release signal from the master station, and allows each slave station to automatically release the blockage by itself after 10 to 20 seconds or more has elapsed since the blockage of each slave station.
This is a method in which the slave station itself has an unblocking function.

In this way, after the blockage is released, even if the slave station 2 is in communication, the released slave station can make a call without waiting for the communication to end.

In other words, emergency interrupt communication is possible. Moreover, if the time setting for unblocking is set differently for each slave station, it is possible to prevent confusion in simultaneous transmissions immediately after unblocking, and there is no need to worry about not being able to unblock even when a slave station is in a reception dead zone.

For example, the time setting for releasing blockage is 20 seconds after blockage.
Confusion due to simultaneous transmission can be sufficiently prevented by setting different times for each slave station at intervals of several seconds, such as 2 seconds, 24 seconds, etc.

Furthermore, setting a random time that can stochastically prevent simultaneous transmission after a certain period of time has passed can be determined based on the scale of the simplex wireless communication, and can be easily calculated and set.

Also, if you want to give a particular slave station many opportunities for two interrupt communications, set the block release time to a very short time, for example two
For example, if communication with slave station 2 is very important and you want to communicate for a slightly longer time, that is, if you do not want to be interrupted by other slave stations 3 to N, then the master station This can be achieved by retransmitting the selection signal within the shortest block release setting time set in the slave station from 1 to 20 seconds, for example.

Such a function is generally in high demand in simplex wireless communication where operation control is often performed mainly by the master station.

FIG. 2 shows an embodiment of a slave station radio device for realizing the system of the present invention.

11 is a selection signal input terminal, 12 is a selection signal judgment circuit,
Y is the output when it is the selection signal of the own station, N is the output when it is the selection signal of another station, 13 is the OR circuit, 14 is the latch circuit, 15.23 is the AND gate, 16 is the communication possible display 17 is a press button, 18 is a wireless transmitter controller, 1
9 is a flip-flop circuit, 20 is a counter circuit, 2
1 is a random number generator, 22 is a clock circuit, S is a set, R
indicates reset.

The selection signal sent from the master station is sent from the selection signal input terminal 11 to the selection signal determination circuit 12 via a wireless receiver (not shown).
given to.

The determination circuit 12 determines whether or not it is the selection signal of the own station, and if it is the selection signal of the own station, it is output to the Y side, and the output is given to the set S side of the latch circuit 14 through the OR circuit 13, and is output to the set S side of the latch circuit 14. 14 is driven, and one gate of AND gate 15 is turned on.

This is a state in which communication is possible at any time, and this state is displayed on the communicable display 16.

If the press button 11 is turned on in this state, the wireless transmitter controller 1B is driven through the AND gate 15, and a wireless transmitter (not shown) is driven to perform transmission.

On the other hand, if the selection signal determination circuit 12 determines that the station is not the own station, the output is output to the N side, the output of the latch circuit 14 is input to the reset R side, and one side of the AND gate 15 is turned off.

Therefore, in this case, the communicable status display 16 displays that the communication is in a state of failure.

In this case, even if the press button 1T is turned on, the AND gate 15 is turned off, so the wireless transmitter controller 18
is not driven and communication is not possible.

The N-side output of the selection signal determination circuit 12 is also applied to the set side S of the flip-flop circuit 19, and its output is applied to the counter circuit 20.

Further, the N-side output of the selection signal determination circuit 12, the output of the flip-flop circuit 19, and the output of the clock circuit 22 are A
Connected to the input of ND gate 123.

The output pulse of I'[lJ of the selection signal determination circuit 12 and the output pulse of the flip-flop circuit 19 are output from the clock circuit 2.
Since the pulse width is larger than the clock pulse width of 2, the counter circuit 20 is cleared by the clock pulse and the counting operation starts from the next clock.

After the counter circuit 20 receives a pulse from the clock circuit 22 and counts a preset time, its output is given to a random number generator 21, and after a period of time determined by the random number generator 21 has elapsed, the output is The generated signal is applied to the OR circuit 13, and then the latch circuit 14 is turned on.

After the preset time between each slave station is counted by the counter circuit 20, the output thereof is given to the OR circuit 13. After the blockage, each slave station counts all at once after the preset time has elapsed. The blockage will be lifted.

In other words, each station starts up at the same time, causing communication confusion.

Therefore, the output of the counter circuit 20 can be set differently for each slave station and fed to the OR circuit 13, or the output of the counter circuit 20 can be fed to the random number generator 21 as shown in FIG. By including this, simultaneous startup of slave stations is made random, and simultaneous-previous startup is prevented.

Therefore, as described above, the communicable display 16 displays the communicable state, the AND gate 15 is turned on, and the wireless transmitter controller 18 is driven to enable communication.

If you want to communicate with the slave station that the master station is currently communicating with on the ground during the blockage release setting time, and you do not want to allow interrupt communication from other slave stations, send the selection signal again within the shortest blockage release setting time. If the signal is sent out, the selected signal determination circuit 12 in the slave station determines the signal as described above, and if it is determined that it is the own station, it is output to the Y side and the communication status continues, and other slave stations output the signal to the N side. is applied to the AND gate 23, the counter 20 is cleared, and the time is counted again, so that the blockage release setting time starts again from the beginning, and this can be realized by extending the blockage time.

(Effects of the Invention) As explained above, according to the present invention, in the simplex wireless communication system, communication between a master station and one slave station can be secured for a necessary and sufficient time, and communication from other slave stations can be prevented in an emergency. It is possible to deal with interrupted communications without delay, and it is also possible to prevent the confusion of simultaneous transmissions from slave stations when the blockage is released, and there is no need to worry about communication being disabled due to the inability to receive the blockage release signal in the reception dead zone. This is a very effective and rational method for operating disaster prevention radios, emergency radios, etc., and causes very little confusion.

In addition, the conventional system requires a block release signal from the master station, and generally providing such a signal makes the system as a whole expensive, but the present invention does not require such a signal, making it economically viable. There are also advantages.

It goes without saying that the present invention can be applied not only to the simplex radio communication system used for disaster prevention, emergency radio, etc., but also to general mobile radio, radio in depopulated areas, etc.

[Brief explanation of the drawing]

FIG. 1 is a block diagram for explaining a simplex wireless communication system, and FIG. 2 shows an embodiment of a slave station radio device for realizing the present invention. 1... Master station radio device (master station), 2 to N are slave station radio devices (slave station), fl is radio wave, 11 is selection signal input terminal, 1
2 is a selection signal determination circuit, 13 is an OR circuit, 14 is a latch circuit, 15.23 is an AND gate, 16 is a communication enable display, 17 is a press button, 18 is a wireless transmitter controller, 1
9 is a flip-flop circuit, 20 is a counter circuit, 2
1 is a random number generator, and 22 is a clock circuit.

Claims (1)

[Claims] 1. In a simplex wireless communication system in which communication is performed between a base station or relay station radio and a plurality of slave station radios using one wave of radio waves, the parent station radio A U that transmits a selection signal from a station or relay station radio and performs communication.
The slave station radio outside is blocked by the signal, and after receiving the signal, the slave station radio releases the blockage by itself after a predetermined time period that differs for each slave station radio, and the slave station joins the communication path. A simplex wireless communication system that is characterized by enabling interrupt communication from. 2 In the simplex wireless communication method, in which communication is performed between a master station or relay station radio and multiple slave station radios using a single radio wave, the master station or relay radio The slave station radios other than those transmitting the selection signal and communicating are blocked by the signal, and after receiving the signal, each slave station radio will randomly activate itself after a certain period of time. A simplex wireless communication system characterized by being released and allowing interrupt communication from a slave station to the communication path.