JP2024021001A - Wireless communication system and wireless communication device - Google Patents

Abstract

To provide a wireless communication system in which a network is formed with a plurality of semi-duplex wireless repeaters relating to different duplex paired channels and a large number of wireless communication devices, and which does not cause a situation in which communication is not possible.SOLUTION: In a wireless communication system, a wireless communication network consists of N wireless repeaters 51, 52, ... whose transmitting and receiving frequencies are different paired channels for duplication, and M (N=2 and M is 3 or more, and N≥3 and M is N or more) wireless communication devices 1 to 5. Each wireless communication device has N receiving demodulation units having the same frequency as the transmitting frequency of each wireless repeater, synthesizes demodulated signals, and outputs audio. Each wireless communication device checks whether each receiving demodulation unit is in a receiving state in a transmitting mode, and sets a modulation transmitting unit to a frequency that has a relation of the paired channels for duplication with the receiving frequency of the receiving demodulation unit in a non-receiving state, and performs transmission.SELECTED DRAWING: Figure 6

Description

The present invention relates to a wireless communication system in which wireless communication devices communicate with each other in a semi-duplex manner via a wireless repeater, and a wireless communication device applied to the system.

Traditionally, wireless repeaters have been used as the simplest means to expand the communication area in semi-duplex communication using duplex pair channels between wireless communication devices, which are specified low-power radio stations. It will be done.

In such a wireless communication system, as shown in FIG. 9, the modulation/transmission unit TX1 and the reception/demodulation unit RX1 of the wireless repeater 200 have duplex pair channels (CH-A_L) and (CH-A_H), respectively. The frequencies of (CH-A_H) and (CH-A_L) are set to the modulation transmitting section TX1 and the receiving and demodulating section RX1 of each wireless communication device 201, 202, respectively, and the frequencies of (A) and (A) in the figure are set. As shown in (B), communication using the semi-duplex method is executed between each of the wireless communication devices 201 and 202 by mutually switching between the transmission mode and the reception mode.
However, a duplication pair channel is a duplication of channel numbers (1 to 19, 32 to 40) shown in Table 3.2 and Table 3.4 on pages 1-5 to 1-6 in Non-Patent Document 1 below. It is a trusted pair channel (pair-to-wave), and "A" in (CH-A_H) and (CH-A_L) is the channel number, and "L" and "H" are the 421MHz band and 440MHz band within the same channel number. Indicates which of the following.

Note that the wireless communication system according to FIGS. 9(A) and 9(B) is one of the area expansion types in the standard system configuration described on pages 1-2 and 1-3 of Non-Patent Document 1 below. As mentioned above, it is a two-frequency simplex system that uses two frequencies (pair channels) for the duplex system, and each wireless communication device 201, 202 (non-patent document 1 below) The base station wireless equipment and the slave station wireless equipment (hereinafter referred to as base station wireless equipment) are capable of semi-duplex communication via a wireless repeater 200 (corresponding to the relay station wireless equipment in Non-Patent Document 1 below)).

Radio Industries Association, “Specified Low Power Radio Stations/Radio Telephone Radio Equipment/Standards”, RCR STD-20 5.1 version, revised October 29, 2021

By the way, in the wireless communication system of FIG. 9, when half-duplex communication is performed between the wireless communication devices 201 and 202, the wireless communication device 202 receives the transmitted radio wave (CH-A_H) from the other wireless communication device 203. Also, when transmitting radio waves (CH-A_H), the other wireless communication device 203 uses carrier sense (as described in Non-Patent Document 1) on the other frequency (CH-A_L) of the duplex pair channel. (Refer to (3) A on page 1-10), but communication with each wireless communication device 201, 202 is not possible because the transmitted radio wave (CH-A_L) from the wireless repeater 200 is detected. .
That is, as a matter of course, the other wireless communication device 203 cannot communicate with each wireless communication device 201, 202 unless the communication between the wireless communication devices 201, 202 is completed.

Accordingly, the present invention provides a plurality of semi-duplex radio repeaters each including a modulation transmitter and a receiver demodulator for different duplex pair channels, and each receiver demodulator corresponding to the transmitting frequency of each of the radio repeaters. It is an object of the present invention to provide a wireless communication system in which a network is configured with a large number of wireless communication devices equipped with the above, and which solves the above-mentioned problems and adds various conveniences.

The first invention provides N units (where N is 2 or more) that relay communication in a half-duplex system using duplex paired channels with different channel numbers as the transmission frequency of the modulation transmitter and the reception frequency of the reception demodulator. It is possible to variably set the transmission frequency for the radio repeaters (integer) and the modulation transmitter, and the N receiving demodulators have the same frequency as the transmitting frequency of the modulation transmitter of each of the radio repeaters. and M units that combine each demodulated signal obtained from the N receiving demodulators and reproduce and output audio using the combined signal (however, in the case of N=2: M is an integer of 3 or more, N≧ Case 3: A wireless communication network consisting of wireless communication devices (M is an integer greater than or equal to N), in which each wireless communication device is configured to perform each reception demodulation of its own device when instructed to shift to transmission mode. If all the receiving demodulators are in the receiving state, transmission is not possible, and if there is a receiving demodulator in the non-receiving state, A radio communication system is characterized in that a procedure for transmitting by setting the reception frequency of a reception demodulation unit in a state and a frequency in a relationship of a pair channel for duplication as the transmission frequency of a modulation transmission unit of the own device. Related.

The present invention relates to a wireless communication system in which wireless communication devices communicate with each other in a semi-duplex mode using a plurality of wireless repeaters.
According to this invention, if there is a wireless repeater among the N wireless repeaters that is not receiving radio waves from the wireless communication device side, all wireless communication devices in the network use that vacant radio. You can check the reception frequency of the reception demodulator of the repeater.
This is because each wireless repeater uses a pair of duplex channels with different channel numbers for transmission and reception, and each wireless communication device is equipped with a reception demodulation section whose reception frequency is the frequency of the modulation transmission section of each wireless repeater. This is because the above-mentioned confirmation can be made based on whether or not radio waves are being received in each reception demodulation section.
Therefore, by setting the transmitting frequency to the frequency that is in the relationship between the receiving frequency of the receiving and demodulating unit in the non-receiving state and the pair channel for duplexing from the wireless communication device, it is possible to ensure that the unused wireless Audio signals can be transmitted to other wireless communication devices via the repeater, and communication can be performed in parallel with communications being relayed by other wireless repeaters within the network.
It should be noted that in a wireless communication device, it is natural that transmission is not possible when all the receiving demodulators are in the receiving state, but as per the above confirmation, when there is a receiving demodulator in the non-receiving state and transmitting. Carrier sense must be executed, but it has already been confirmed from the non-receiving state of the receiving demodulator that the frequency that is related to the transmission frequency and the duplex pair channel is not in use. is being executed.

In the first invention, a plurality of wireless communication devices among the M wireless communication devices are grouped by a common attribute of using only a specific wireless repeater among the N wireless repeaters. , and the wireless communication device belonging to the group puts into operation only the reception demodulation unit whose frequency is the same as the transmission frequency of the modulation transmission unit of the specific radio repeater among the N reception demodulation units, By setting the other reception demodulators in a non-operating state, it becomes possible to operate group communications in units of wireless repeaters within the network.
In that case, the wireless communication device has a reception demodulation section corresponding to the transmission frequency of each wireless repeater, and combines and reproduces the demodulated signals, but the wireless communication device to which the wireless communication device belongs Since the reception demodulators other than the reception demodulator for the reception frequency, which is the same frequency as the reception frequency, are inactive, the voices of other groups will not be mixed in with the communication within the group, allowing smooth group operation. Become.

A second invention relates to a wireless communication device suitable for the wireless communication system of the first invention, in which demodulated signals output from N receiving demodulators are combined via variable attenuators and operated. Each time a specific key of the section is operated, one reception demodulation section is selected in sequence, the attenuation amount of the variable attenuator corresponding to the selected reception demodulation section is set to 0 dB, and the attenuation amount of the variable attenuator corresponding to the other reception demodulation sections is set to 0 dB. The state where the attenuation amount of the attenuator is 20*log ₁₀ {X/(N-1)} dB [however, 0<X≦0.5] and the attenuation amount of the variable attenuator corresponding to all reception demodulators 20*log ₁₀ (1/N)} dB.

When the wireless communication device of the present invention is applied, during the group operation according to the first invention, only the reception demodulation section used for intra-group communication to which the device belongs is put into an operating state, and the other reception demodulation sections are put into a non-operation state. In addition to being able to listen to the audio of communications within each group selectively each time a specific key is operated, it is also possible to listen to the audio of communications within each group at once. Since you can also choose to listen to the information, it becomes possible to adapt your aircraft to a variety of operations with simple operations.
Furthermore, depending on how X is set, it is possible to make it possible to listen to the contents of other groups' calls within a range that does not interfere with listening to the voices of intra-group communications, or it is possible to make it so that they are almost inaudible.

According to the wireless communication system of the present invention, half-duplex communication is allowed for the number of wireless repeaters in the network.
The fact that the wireless communication device can confirm which wireless repeater is free means that carrier sense has been executed in advance, and communication can be started using the free wireless repeater. be able to.
Additionally, all wireless communication devices belonging to the network can intercept the entire call content.
On the other hand, wireless communication devices form a group in units of wireless repeaters, and each wireless communication device has a non-operating section other than the receiving and demodulating section of the channel used in the group to which it belongs. Group operation becomes possible.
In addition, even in such a group operation, it is possible to intercept the entire communication content by keeping all the receiving and demodulating sections of a specific wireless communication device in operation.
According to the wireless communication device of the present invention, it is applied to the wireless communication system of the above-mentioned invention, and the wireless communication device can be adapted to various operations with just a simple key operation.

1 is a schematic wireless communication network diagram according to an embodiment of the wireless communication system of the present invention (wireless communication devices 1 and 2 are communicating in a semi-duplex mode). FIG. FIG. 2 is a schematic wireless communication network diagram according to the embodiment (wireless communication devices 1 and 2 are communicating in a semi-duplex mode). FIG. 2 is a functional block diagram of a wireless repeater used in the wireless communication network according to the embodiment. 1 is a functional block diagram of a wireless communication device used in a wireless communication network according to an embodiment. FIG. 12 is a flowchart illustrating a procedure from setting a transmission frequency when a wireless communication device shifts to a transmission mode until exiting the transmission mode after a call ends. FIG. 2 is a schematic wireless communication network diagram according to the embodiment (a state in which the wireless communication device 3 is transmitting while the wireless communication device 1 is transmitting). FIG. 2 is a schematic wireless communication network diagram according to the embodiment (a state in which the wireless communication device 5 is transmitting to reply to the wireless communication device 3 while the wireless communication device 1 is transmitting). FIG. 2 is a schematic wireless communication network diagram according to the embodiment (in a state in which wireless communication devices are grouped for each wireless repeater 51, 52). FIG. 2 is a diagram illustrating problems in conventional technology in communication using a semi-duplex wireless repeater.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a wireless communication system and a wireless communication device according to the present invention will be described in detail below with reference to the drawings.
1 and 2 show that in a wireless communication network composed of two wireless repeaters 51 and 52 and five wireless communication devices 1 to 5, wireless communication devices 1 and 2 are connected to each other via a wireless repeater 51. This shows a state in which communication is being performed using the duplex method, and in FIG. 1, an audio signal is being transmitted from wireless communication device 1 to wireless communication device 2, and in FIG. 2, an audio signal is being transmitted from wireless communication device 2 to wireless communication device 1. There is.
However, in each figure, the frequency notation of TX1 (modulation transmitter), RX1, RX2 (receiver demodulator), CH-A_L, CH-A_H, CH-B_L, CH-B_H is as described in the [Background technology] column. Follow the instructions.

In each figure, the wireless repeater 51 executes wireless relay operation in a semi-duplex method using the 440 MHz band of duplex channel number A as the receiving frequency (CH-A_H) and the 421 MHz band as the transmitting frequency (CH-A_L). However, the wireless repeater 52 executes a wireless relay operation in a semi-duplex method using the 440 MHz band of duplex channel number B as the receiving frequency (CH-B_H) and the 421 MHz band as the transmitting frequency (CH-B_L). It is.

The basic functional configuration of each of these wireless repeaters 51, 52 is shown in FIG.
The radio signal obtained from antenna 501 is input to reception demodulation section 502, and the radio signal of the set reception channel is demodulated and output to modulation transmission section 503. Modulation transmission section 503 uses the input demodulation signal to The carrier signal is modulated, and the modulated carrier signal is amplified in power and transmitted from the antenna 504 on a set transmission channel.
Note that the system control unit 505 controls the operation of the entire system, including the half-duplex relay operation of each wireless repeater 51, 52.

On the other hand, for each wireless communication device 1 to 5, the transmission frequency of the modulation transmitter TX1 can be set to (CH-A_H) or (CH-B_H), which is the reception frequency of each wireless repeater 51, 52. Two reception demodulators (RX1: CH-A_L), (RX2: CH-B_L) are set to reception frequencies corresponding to the transmission frequencies (CH-A_L) and (CH-B_L) of each wireless repeater 51 and 52. ).
Then, as shown in Figures 1 and 2, the demodulated signals of each reception demodulator (RX1: CH-A_L), (RX2: CH-B_L) are synthesized and output as reproduced audio from the speaker (or earphone). It is now output.

The basic functional configuration of each of the wireless communication devices 1 to 5 is shown in FIG.
Regarding the reception system, the radio wave signal received by the antenna 101 is input to two reception demodulation units 102 and 103, and each reception demodulation unit set to a different reception channel (RX1: CH-A_L), (RX2: CH-B_L) By selecting and demodulating received signals in sections 102 and 103, audio signals of each receiving channel are obtained.
Output control section 104 selects whether to output one of the audio signals demodulated by each reception demodulation section 102, 103, or to combine and output both, and the selected audio signal is amplified by amplifier 105. The sound is played back through the speaker (or earphones) 106.
Note that FIG. 1, FIG. 2, FIG. 6, and FIG. 7 show a state in which a composite output is performed.

On the other hand, regarding the transmission system, the audio signal from the microphone 107 is amplified by the amplifier 108 and output to the modulation transmission section 109.The modulation transmission section 109 modulates the carrier signal with the audio signal, and the modulated carrier signal is used as the power source. It is amplified and transmitted from the antenna 110.
Then, as will be described later, the transmission frequency set in the modulation and transmission section 109 is determined based on the confirmation result of the reception state of each of the reception and demodulation sections 102 and 103, and when transmission is possible, the transmission frequency is set at each of the radio repeaters 51 and 52. Either the reception frequency (CH-A_H) or (CH-B_H) of the reception demodulation unit (502) is set.

The operation of the entire system of the radio communication devices 1 to 5 is controlled by a system control unit 111.
That is, the system control unit 111 sets the channels of the reception demodulation units 102 and 103 and the modulation and transmission unit 109, and sets each demodulation in the output control unit 104 based on the instruction signal from the operation unit 112 and various signals obtained from the reception demodulation units 102 and 103. It sets the amount of attenuation by a signal attenuator (not shown), synthesizes the signals, switches the operation mode, etc., and also controls the liquid crystal display section 113 regarding the display of channels in use and operation modes.
Note that the instruction signals from the operation unit 112 include various operation signals of the UP/DOWN button, ACCESS key, and CUE key, and the system control unit 111 also receives these operation signals and performs control corresponding to the operation. I do.

Returning to FIGS. 1 and 2, in half-duplex communication by the wireless communication devices 1 and 2 via the wireless repeater 51, the frequency of the upstream radio waves to the wireless repeater 51 is (CH-A_H), The frequency of the downlink radio waves from the wireless repeater 51 is (CH-A_L).
Therefore, when either wireless communication device 1 or 2 is in the transmitting state, all wireless communication devices 1 to 5 in the network can reproduce the audio signal received by the reception demodulator (RX1: CH-A_L), and the wireless It is possible to intercept calls related to communications between the communication devices 1 and 2.

On the other hand, not only in the communication state of the wireless communication devices 1 and 2 as shown in FIGS. Similar to the situation explained in Figure 9, other wireless communication devices are unable to transmit on the frequency (CH-A_H) (busy due to carrier sense), and are forced to wait until the transmission is completed. .

However, in this network, while the wireless repeater 51 uses a duplex pair channel with channel number A, it also includes a wireless repeater 52 that uses a duplex pair channel with channel number B. For example, Even in the communication state shown in FIGS. 1 and 2, it is possible to perform half-duplex communication via the wireless repeater 52 from the wireless communication devices 3 to 5 other than the wireless communication devices 1 and 2.
More generally, even when any of the wireless communication devices 1 to 5 is communicating via one of the wireless repeaters 51/52, the other wireless communication devices are communicating via the other wireless repeater 52/52. It is possible to perform communication via 51 in parallel.

In addition, in any of the wireless communication devices 1 to 5, a reception demodulation section (RX1: CH-A_L) whose reception frequency is the same as the transmission frequency of the modulation transmission section TX1 (503) of each wireless repeater 51, 52, (RX2: CH-B_L), and the demodulated signals of these receiving demodulators (RX1) and (RX2) are combined and output as playback audio from the speaker (or earphone), so wireless communication is possible. Machines 1 to 5 can always intercept the audio of communications exchanged within the network.

From the above, in the network according to this embodiment, the procedure from when each wireless communication device 1 to 5 shifts to the transmission mode, ends the call, and exits the transmission mode is as shown in the flowchart of FIG.
However, in the relationship between the functional block diagram of the wireless communication device in FIG. 4 and each wireless communication device 1 to 5 in FIG. 1 (or FIG. 2), the reception demodulation unit 102 The modulation transmission section 103 corresponds to (RX2: CH-B_L), and the modulation transmission section 109 is TX1, which can be set to the transmission frequency of (CH-A_H) or (CH-B_H), and these notations will be used together below. There are things to do.

First, the modulation/transmission section 109 (TX1) is in the OFF state, the reception demodulation section 102 (RX1: CH-A_L) and the reception demodulation section 103 (RX2: CH-B_L) are both in the ON state, and the operation section 112 is turned off. When the ACCESS key is turned ON, the system control unit 111 checks whether the reception demodulation unit 102 (RX1: CH-A_L) and the reception demodulation unit 103 (RX2: CH-B_L) are in the receiving state (S1 ,S2).
Here, when both are in the receiving state, the frequency set in the modulation transmitting section 109 (TX1) in the wireless communication devices 1 to 5 is the receiving frequency (CH- A_H), (CH-B_H), it is impossible to transmit from the own device without performing carrier sense, and the system control unit 111 performs busy processing to return to the original state (S3, S4→S1 ).

On the other hand, when only the receiving demodulator 102 (RX1) is in the receiving state, the transmitting frequency of the modulating transmitter 109 (TX1) is set to (CH-B_H) and the mode shifts to the transmitting mode (S5, S6).
In other words, the fact that only the receiving demodulator 102 (RX1) is in the receiving state means that communication is being performed via the wireless repeater 51 regarding the duplex pair channel CH-A, and therefore, the frequency ( Although communication using the channel CH-A_H) is not possible, communication via the wireless repeater 52 related to the other duplication pair channel (CH-B) is possible, so the system control unit 111 controls the modulation transmitting unit 109 ( Set the frequency (CH-B_H) to TX1).

The procedures of steps S5 and S6 are performed, for example, when the wireless communication device 1 and the wireless communication device 2 are communicating in the semi-duplex mode as shown in FIGS. 1 and 2, as shown in FIG. This corresponds to a case where the wireless communication device 3 attempts to start half-duplex communication with a wireless communication device 4 or 5 other than the above via the wireless repeater 52.
FIG. 7 shows a state in which the wireless communication device 5 responds to the call originating from the wireless communication device 3, and the wireless communication device 5 is transmitting data to the wireless communication device 3 via the wireless repeater 52. .

Therefore, in this state, the half-duplex method of wireless communication device 1 and wireless communication device 2 using the duplex pair channels (CH-A_H) and (CH-A_L) of channel number A via the wireless repeater 51. communication and half-duplex communication between the wireless communication device 3 and the wireless communication device 5 using duplex pair channels (CH-B_H) and (CH-B_L) with channel number B via the wireless repeater 52. The reception demodulation unit 102 (RX1: CH-A_L) and the reception demodulation unit 102 (RX1: CH-A_L) are executed in parallel in the network, and in all wireless communication devices 1 to 5 in the network, including the wireless communication devices that are performing communication. It is possible to intercept calls related to communication between the two parties as reproduced audio synthesized from audio signals demodulated by the unit 103 (RX2: CH-B_L).

Returning to the flowchart of FIG. 5, if only the reception demodulator 102 (RX1) is not in the reception state in step 5, either only the reception demodulator 103 (RX2) is in the reception state, or the reception demodulator 102 (RX1) is not in the reception state. , 103 (RX2) are in a non-receiving state. In this case, the system control unit 111 sets the transmission frequency of the modulation transmitter 109 (TX1) to (CH-A_H) and enters the transmission mode. Transfer (S7, S8).

In other words, the fact that only the receiving demodulator 103 (RX2) is in the receiving state means that communication is being performed via the wireless repeater 52 regarding the duplex pair channels (CH-B_H) and (CH-B_L) of channel number B. This means that communication using the frequency (CH-B_H) is not possible in the network, but communication via the wireless repeater 51 related to the duplication pair channel (CH-A_H), (CH-A_L) of channel number A is not possible. Therefore, the system control unit 111 sets the frequency (CH-A_H) to the modulation transmitting unit 109 (TX1).
Furthermore, if both reception demodulation sections 102 (RX1) and 103 (RX2) are in a non-receiving state, either frequency (CH-A_H) or (CH-B_H) is set to modulation transmission section 109 (TX1). However, in this embodiment, (CH-A_H) is set with priority.

As described above, when the ACCESS key is turned ON, the reception status of the reception demodulation sections 102 (RX1) and 103 (RX2) is checked, and the transmission frequency is set in the modulation transmission section 109 (TX1) according to the results. and shifts to the transmission mode (S5 to S8), but in that case, the reception demodulator 102 (RX1) or 103 (RX2) does not receive the frequency that has a duplex pair channel relationship with the transmission frequency. Since it has been confirmed in advance that the same frequency is not in use, carrier sensing has already been executed.
After that, when the call in transmission mode ends and the ACCESS key is turned ON again, the system control unit 111 switches the modulation transmission unit 109 (TX1) from the ON state to the OFF state, ends the transmission operation, and returns to the transmission mode. Exit (S9,S10).

By the way, as shown in FIG. 8, wireless communication devices 1 to 5 constitute groups (1) and (2) for each wireless repeater 51, 52, and communicate within each group. There may be a need for a network configuration in which a wireless communication device does not belong to each group and can appropriately communicate with the wireless communication devices of each group via the wireless repeaters 51 and 52 while intercepting communication within both groups.
For example, assuming hotel business, group (1) may correspond to the accommodation department group, group (2) may correspond to the food and beverage department group, wireless communication device 2 may correspond to the general manager, and so on.

In such a network configuration, wireless communication devices 1 and 4 of group (1) and wireless communication devices 3 and 5 of group (2) only need to listen to calls within the group to which they belong, and listen to calls from other groups. If the voice of a group call is synthesized and played back, it becomes difficult to hear the content of the call made by the user's own group.
However, the wireless communication device 2 must always listen to calls within both groups (1) and (2).

Therefore, as shown in FIG. 8, each wireless communication device 1, 4 of group (1) has a reception demodulator 102 (RX1: CH-A_L) corresponding to the transmission frequency (CH-A_L) of the wireless repeater 51. The reception demodulator 103 (RX2: CH-B_L) is kept in the ON state and the reception demodulator 103 (RX2: CH-B_L) is kept in the OFF state, and each radio communication device 3, 5 of group (2) The corresponding reception demodulation section 103 (RX2: CH-B_L) is kept in the ON state, and the reception demodulation section 102 (RX1: CH-A_L) is kept in the OFF state.
By doing this, in each group (1) and (2), the call sounds of other groups are not synthesized and played back, and only the call of the own group can be clearly heard, so the independent sound of each group can be heard. Simultaneous operation becomes possible.
ON/OFF settings for the reception demodulation units 102 (RX1) and 103 (RX2) of each of the wireless communication devices 1, 4, 3, and 5 can be performed through the system control unit 111 by operating input from the operation unit 112.
However, the wireless communication device 2 is not subject to the above settings due to its role.

In this embodiment, since the network uses two wireless repeaters 51 and 52, the receiving and demodulating sections of each wireless communication device 1 to 5 also have two configurations. In the case of a wide-area network using wireless repeaters, the wireless communication devices 1 to 5 will have reception demodulation sections equal to the number of wireless repeaters.
In that case, each wireless communication device belonging to a group of wireless repeaters turns on only the receiving and demodulating section of the multiple receiving and demodulating sections that have the same reception frequency as the frequency of the modulation transmitting section of the wireless repeater. In addition, other reception demodulators are kept in the OFF state.

As a configuration of the individual wireless communication devices 1 to 5 that is more suitable for group operation, the output control section 104 is provided with an attenuator corresponding to each reception demodulation section 102 (RX1), 103 (RX2), and the operation section 112 is Every time a specific key (for example, the ACCESS key) is turned on, the system control unit 111 controls each attenuator to cycle through the output signals of the reception demodulation unit 102 (RX1) and reception demodulation unit 103 (RX2). It is also conceivable to create the following states (a), (b), and (c).
(a) The demodulated signal of the reception demodulator 102 (RX1) remains unchanged, the demodulated signal of the reception demodulator 103 (RX2) is attenuated by 12 dB, and each signal is combined and output.
(b) The demodulated signal of the reception demodulator 102 (RX1) is attenuated by 12 dB, the demodulated signal of the reception demodulator 103 (RX2) remains unchanged, and each signal is combined and output.
(c) Attenuate each demodulated signal of reception demodulation section 102 (RX1) and reception demodulation section 103 (RX2) by 6 dB, and combine and output each signal.

By equipping the wireless communication devices 1 to 5 with such a function, each wireless communication device 1 to 5 can be freely adapted to group operation by simply turning on a specific key on the operation unit 112. It becomes possible to adjust the two received voices to suit various usage conditions within the network.
Furthermore, if the amount of attenuation for the demodulated signal can also be adjusted and set, fine adjustments can be made.

In addition, in this case as well, generalizing, the configuration of a wireless communication device in a network using N units (N≧2) wireless repeaters and having N reception demodulation units is N. The demodulated signals output from the reception demodulators are combined via variable attenuators, and each time a specific key on the operation unit is operated, one reception demodulation unit is sequentially selected. Let the attenuation of the _variable attenuator corresponding to 0.5] and a state where the attenuation amount of the variable attenuator corresponding to all reception demodulators is set to 20*log ₁₀ (1/N)} dB may be repeated cyclically.

Here, the significance of "20*log ₁₀ {X/(N-1)}dB [however, 0<X≦0.5]" is that the demodulated signal of each receiving demodulator is attenuated to 1/2 or less, and , (N-1) demodulated signals from the receiving demodulators are further attenuated to a level of 1/(N-1), which is "20*log ₁₀ (1/N)} dB. '' means that the demodulated signals of the N receiving demodulators are not attenuated as described above, but are attenuated to a level of 1/N in order to combine all of them.
In addition, if the number of wireless repeaters is two, N=2 and X corresponds to 1/4.

The present invention can be applied to a wireless communication network using a wireless repeater.

1 to 5...Radio communication device, 51,52...Radio repeater, 101...Antenna, 102,103...Reception demodulation section, 104...Output control section, 105...Amplifier, 106...Speaker (earphone), 107...Microphone, 108...Amplifier , 109...Modulation/transmission section, 110...Antenna, 111...System control section, 112...Operation section, 113...Display section, 501...Antenna, 502...Reception demodulation section, 503...Modulation/transmission section, 504...Antenna, 505...System Control unit, 200...wireless repeater, 201-203...wireless communication device.

Claims (3)

N wireless repeaters (where N is an integer greater than or equal to 2) that relay communication in a half-duplex method using duplex paired channels with different channel numbers as the transmission frequency of the modulation transmitter and the reception frequency of the receiver and demodulator. It is possible to variably set the transmission frequency for the modulation transmission section, and has N receiving demodulation sections having the same frequency as the transmission frequency of the modulation transmission section of each radio repeater, and M units synthesize each demodulated signal obtained from the reception demodulation section of A wireless communication network consisting of a wireless communication device (an integer greater than or equal to N),
When each wireless communication device is instructed to shift to transmission mode, it has a procedure for checking whether each reception demodulation section of the device is in the reception state of radio waves, and a procedure for checking whether all reception demodulation sections are in the reception state. If there is a receiving demodulator in the non-receiving state, transmission is disabled, and if there is a receiving demodulator in the non-receiving state, the own device modulates and transmits the frequency that is in the relationship of the duplex pair channel with the receiving frequency of the receiving demodulator in the non-receiving state. 1. A wireless communication system, characterized in that the wireless communication system performs a procedure of setting a transmitting frequency to a transmitting frequency of a transmitter and transmitting a transmitter. A plurality of wireless communication devices among the M wireless communication devices form a group with a common attribute of using only a specific wireless repeater among the N wireless repeaters, and belong to the group. The wireless communication device activates only the reception demodulation unit among the N reception demodulation units that has the same frequency as the transmission frequency of the modulation transmission unit of the specific radio repeater, and deactivates the other reception demodulation units. The wireless communication system according to claim 1, wherein the wireless communication system is set to a state. In the wireless communication system according to claim 1, each of the demodulated signals outputted by the N receiving demodulators is synthesized via a variable attenuator, and each time a specific key on the operating unit is operated, one received demodulated signal is sequentially output. The attenuation amount of the variable attenuator corresponding to the selected reception demodulation section is set to 0 dB, and the attenuation amount of the variable attenuator corresponding to the other reception demodulation sections is set to 20*log ₁₀ {X/(N- 1)}dB [however, 0<X≦0.5] and a condition where the attenuation amount of the variable attenuator corresponding to all reception demodulators is 20*log ₁₀ (1/N)}dB. A wireless communication device characterized by repeating cyclically.

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