KR102179519B1 - Firefighting wireless communication system and firefighting power line amplifier capable of always-on output of downlink signals in emergency situations - Google Patents

Abstract

The present invention provides a wireless communication system capable of quickly responding to accidents by enabling integrated command and control on-site when fighting fires and saving lives since, for urgent matters to be delivered to firefighters as the top priority, always-on delivery is possible in the situation room even during communication between firefighters or when a radio transmission signal is continuously transmitted because a radio transmission button of a firefighter is pressed incorrectly by solving the problems of the conventional firefighting wireless communication system.

Description

FIREFIGHTING WIRELESS COMMUNICATION SYSTEM AND FIREFIGHTING POWER LINE AMPLIFIER CAPABLE OF ALWAYS-ON OUTPUT OF DOWNLINK SIGNALS IN EMERGENCY SITUATIONS}

The present invention relates to a wireless communication system, and more particularly, to a wireless communication system for fire fighting and a power line amplifier for fire fighting.

The fire fighting wireless communication system is a fire fighting communication facility used for radio communication between firefighters entering the control room and the building, and radio communication between firefighters entering the building in case of fire suppression and emergency situations. In the event of fire suppression and emergency situations, if communication between firefighters entering the building continues, there may be cases where the emergency information to be delivered to firefighters in the situation room cannot be properly delivered.

In the firefighting wireless communication system, communication is performed between firefighters and between the control room and firefighters through radios, but the communication method of the radio is not a full duplex communication system, but a one-frequency one-way communication (Half Duplex Communication System). There is no simultaneous communication between firefighters and between the control room and firefighters using radios.

Since the communication of the firefighting radios is performed alternately, the radios of the other side can transmit only when the radios of one side have finished transmitting, and thus, it may be difficult to deliver urgent information in the situation room.

In particular, in the case of a situation where it is difficult to communicate with the radio because the radio transmission signal is continuously transmitted because the radio transmission button of a firefighter is pressed incorrectly, it is not possible to notify the emergency situation to all the firefighters in the situation room. There is a case to cause.

Patent Document 1: Unexamined Patent Publication No. 10-2018-0039203 (2018.04.18) Patent Document 2: Unexamined Patent Publication No. 10-2018-0018952 (2018.02.22)

The present invention solves the problem of the conventional wireless communication system for firefighting, so that during communication between firefighters or when the radio transmission signal of the firefighter is pressed incorrectly and the radio transmission signal is continuously transmitted, the first priority is transmitted to the firefighters in the situation room. By enabling always-on delivery of urgent matters to be desired, a wireless communication system for firefighting and a power line amplifier for firefighting are provided that enable rapid on-site command and control in the event of fire suppression and life-saving in the field. I want to provide.

In the wireless communication system for fire fighting according to an embodiment of the present invention,

A first wireless device that transmits an emergency downlink signal to a plurality of second wireless devices;

A repeater that generates a pilot signal, merges it with the emergency downlink signal, and outputs the merged signal; And

When the pilot signal is detected, a wireless communication signal between the second wireless devices and a wireless uplink signal to the first wireless device are blocked, and the emergency downlink signal in which the pilot signal is merged is output to each of the second wireless devices. And a plurality of power line amplifiers (PLAs).

Preferably,

The first wireless device is a radio that is transmitted/received by a user located in a control room or a disaster prevention room, and each of the second wireless devices is a radio that is transmitted/received by individual firefighters located on different floors of the building. to be.

Preferably,

The frequency band of the emergency downlink signal and the frequency band of the pilot signal are different, and the frequency band of the emergency downlink signal is 449 to 450MHz.

Preferably,

Each of the power line amplifiers PLA is located on a different floor inside the building.

Preferably,

When the pilot signal is not detected, the power line amplifier PLA outputs a wireless communication signal between the second wireless devices or a wireless uplink signal to the first wireless device.

Preferably,

The repeater is

A detector for detecting the emergency downlink signal;

A PLL (Phase Lock Loop) generating the pilot signal;

A controller controlling the PLL according to whether the emergency downlink signal is detected; And

And a combiner for merging and outputting the pilot signal and the emergency downlink signal.

Preferably,

The power line amplifier is

An outgoing signal detector that detects whether an outgoing signal from the second wireless device is transmitted for a predetermined time period or longer;

When the outgoing signal is transmitted for more than the time period, it further comprises a switch for blocking the outgoing signal.

In the fire fighting power line amplifier (PLA: Power Line Amp) according to another embodiment of the present invention,

A first distributor for branching the emergency downlink signal from the first wireless device to the plurality of second wireless devices into a first path and a second path;

A detector for detecting a pilot signal from an emergency downlink signal in the first path;

Upon detection of the pilot signal, a wireless uplink signal from the second wireless device to the first wireless device or a communication signal between the second wireless devices is blocked, and the emergency downlink signal is transmitted to the second wireless device through the second path. A switch outputting to each device, and transmitting the wireless uplink signal to the first wireless device or a communication signal between the second wireless devices when the pilot signal is not detected; And

And a controller for controlling the switch according to whether the pilot signal is detected.

Preferably,

The first wireless device is a radio that is transmitted/received by a user located in a control room or a disaster prevention room, and each of the second wireless devices is a radio that is transmitted/received by individual firefighters located on different floors of the building. to be.

Preferably,

The frequency band of the emergency downlink signal and the frequency band of the pilot signal are different, and the frequency band of the emergency downlink signal is 449 to 450MHz.

Preferably,

The power line amplifier (PLA) is composed of a plurality, each characterized in that located on a different floor inside the building.

Preferably,

An outgoing signal detector that detects whether an outgoing signal from the second wireless device is transmitted for more than a predetermined time period; further comprising,

The switch blocks the outgoing signal when the outgoing signal is transmitted for more than the time period.

Preferably,

A plurality of second splitters for distributing the emergency downlink signal, the wireless uplink signal, or the communication signal between the second wireless devices through different paths; And

And a plurality of combiners for merging and outputting an emergency downlink signal, a wireless uplink signal, or a communication signal between the second wireless devices from different paths.

Preferably,

Each of the second distributors and each of the couplers is characterized in that it is composed of a coupler.

According to the firefighting wireless communication system and firefighting power line amplifier capable of always on-outputting the emergency down signal according to the present invention, the radio transmission signal is continuously transmitted during communication between the firefighters or when the radio transmission button of the firefighters is pressed incorrectly. Even in the event of a problem, it is possible to provide always-on delivery of urgent matters to be delivered to firefighters in the situation room with the highest priority, enabling rapid on-site command and control during fire extinguishing and lifesaving at the site, enabling quick response to accidents. I can.

According to the firefighting wireless communication system and firefighting power line amplifier capable of always-on output of an emergency down signal according to the present invention, it is possible to deliver always-on for urgent matters, thereby ensuring maximum safety of firefighters performing rescue activities. have.

FIG. 1 is a schematic diagram of communication of an emergency downlink signal from a situation room or a disaster prevention room to a radio station for a firefighter using the wireless communication system for fire fighting of the present invention.
2 is a schematic diagram of an upward wireless communication from a radio of a fire crew to a control room or a disaster prevention room by using the wireless communication system for fire fighting of the present invention.
3 is a view showing a detailed detailed view of the repeater constituting the wireless communication system for fire fighting of the present invention shown in FIG. 1 or 2;
FIG. 4 is a diagram showing a detailed detailed view of a power line amplifier (PLA) constituting the wireless communication system for fire fighting of the present invention shown in FIG. 1 or 2.

Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention. However, in describing a preferred embodiment of the present invention in detail, when it is determined that a detailed description of a related air function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, the same reference numerals are used throughout the drawings for portions having similar functions and functions.

In the fire fighting wireless communication system of the present invention, urgent matters can be given priority to the firefighters in the situation room even during communication between firefighters inside the building, and the radio transmission signal is continuously pressed because the radio transmission button of an arbitrary firefighter is incorrectly pressed. It is configured so that urgent matters can be delivered from the situation room even in situations where it is difficult to communicate with the radio.

By using the wireless communication system for firefighting of the present invention, it is possible to quickly respond to accidents by enabling rapid on-site command and control during fire suppression and lifesaving at the fire site, reducing property damage and life-threatening accidents, and ensuring maximum safety of firefighters. I will be able to.

FIG. 1 is a schematic diagram of communication of an emergency downlink signal from a situation room or a disaster prevention room to a radio station for a fire fighter using the wireless communication system for fire fighting of the present invention.

1 shows a schematic diagram 100 of a downlink wireless communication from a control room or a disaster prevention room to a radio crew of a fire fighter using the wireless communication system for fire fighting of the present invention.

The wireless communication system for fire fighting of the present invention includes a first wireless device 110-1 or 110-2 (for example, a radio in a control room or a radio in a disaster prevention room), a repeater 130, and a plurality of power line amplifiers 160-1. , 160-2, ..., and 160-5) and a plurality of second wireless devices (120-1, 120-2, ..., and 120-5) (e.g., on each floor inside the building Includes radios used by firefighters located.

In FIG. 1, signal transmission from a situation room or a disaster prevention room to a firefighter's radio is referred to as downward wireless communication, and signal transmission from a firefighter to a situation room or a disaster prevention room is referred to as upward wireless communication.

The repeater 130 in the fire fighting wireless communication system of the present invention generates a pilot signal, merges it with an emergency downlink signal from the first wireless device (radio 110-1 or 110-2) and outputs it. The detailed operation of the repeater is described in FIG. 3 below.

The wireless communication system for firefighting in the present invention is characterized in that it is configured to block communication between firefighters when an emergency downlink signal in which a pilot is merged is detected, and transmit only an emergency downlink signal.

The downlink line 140 may include a signal splitter 145 in the middle of the line in order to transmit signals to various floors inside the building.

The upward line 150 may include a combiner 155 that combines or merges upward signals from radios of firefighters on various floors of a building and transmits them to a situation room or a disaster prevention room.

The downward line 140 or the upward line 150 may be formed of a coaxial cable.

As shown in FIG. 1, it is apparent to those skilled in the art that the combiner may be configured as a divider, and may operate as a divider or as a combiner depending on a transmission direction of a signal. The divider or coupler may also be configured as a coupler.

A plurality of power line amplifiers (160-1, 160-2, ..., and 160-5) are located on each floor of the building to transmit signals from the control room or disaster prevention room and between firefighters located on each floor. It is configured to enable direct communication.

The power line amplifier includes a plurality of dividers and combiners to distribute input signals to several different paths, and to merge or combine and output signals of different paths, thereby enabling inter-floor communication inside a building.

The power line amplifier of the present invention is a wireless communication signal between the second wireless device (120-1, 120-2, ..., and 120-5) and the first wireless device (110-1 or 110-) when detecting a pilot signal. Blocks the wireless uplink signal to 2), and outputs only the emergency downlink signal to each of the second wireless devices.

1 is a schematic diagram of the flow of a radio signal for fire fighting when a radio (110-1 or 110-2) transmits in a situation room and a disaster prevention room.

When the radio (110-1 or 110-2) transmits an emergency downlink signal in the situation room and the disaster prevention room, the emergency downlink signal is input to the RX input port of the wireless communication repeater 130 through the antenna 135.

The wireless communication repeater 130 includes an RX input port and an RX output port involved in downlink signal communication, and a TX input port and TX output port involved in uplink signal communication.

The RX module 131 of the wireless communication repeater 130 generates a pilot signal, merges the generated pilot signal into an emergency downlink signal, and transmits it to the downlink line 140 through the RX output port.

The PSU 133 receives AC power through a power supply, outputs DC power required for the repeater, and supplies it to the RX module 131, the TX module 132, and the control board 134. . The PSU 133 may be configured separately to install an emergency power supply (battery).

The generation of the pilot signal in the RX module 131 is performed under the control of a control board 134.

The divider 145 on the downlink line 140 separates and outputs the emergency downlink signal in which the pilot signals are merged into two paths.

The signal output from the distributor 145 shown in FIG. 1 is separated and transmitted along a ground path and an underground path.

The distributor 145 of the downlink line 140 may be removed according to the structure of the building or as needed. In FIG. 1, the distributor 145 is provided to enable total communication for a building composed of ground and underground. It was placed.

Each of the power line amplifiers (PLA) (160-1, 160-2, ..., or 160-5) is arranged on each floor of the building, and the RX input port, RX output port and It includes RX antenna, TX input port for uplink communication, TX output port, and TX antenna.

The emergency downlink signal merged with the pilot signal is input to the RX input port of the PLA (160-3) on the ground floor, and is output to the RX antenna, and the second wireless device of the firefighter located on the ground floor (radio 120-3). )) to transmit an emergency downlink signal.

The PLA 160-3 removes the pilot signal when transmitting an emergency downlink signal to the radio 120-3.

At the same time, the emergency downlink signal in which the pilot signal is merged is input to the RX input of the PLA (160-4) on the first basement floor and output to the RX antenna, which is then sent to the firefighter's wireless device (120-4) located on the first basement floor. It carries a downlink signal.

The emergency downlink signal in which the pilot signal transmitted through the RX output port of the PLA 160-3 is merged is input to the RX input port of the PLA 160-2 located on the second floor.

In addition, the emergency downlink signal in which the pilot signal transmitted through the RX output port of the PLA 160-4 is merged is input to the RX input port of the PLA 160-5 located on the second basement floor.

The transmission of emergency downlink signals on the other floors of the building is transmitted through the power line amplifiers located on each floor through the same process as described for the first floor above and the first floor below.

The signals transmitted from the firefighter's wireless devices (i.e., radios) (120-1, 120-2, ..., and 120-5) located on each floor are transmitted to the TX antennas of the PLA located on that floor. Therefore, as shown in Fig. 1, the uplink communication in each floor is completely stopped, and all of them receive an emergency downlink signal.

When the pilot signal is not detected, the power line amplifier PLA outputs a wireless communication signal between the second wireless devices or a wireless uplink signal to the first wireless device.

2 is a schematic diagram of an upward wireless communication from a radio of a fire crew to a control room or a disaster prevention room by using the wireless communication system for fire fighting of the present invention.

FIG. 2 is a diagram schematically illustrating transmission of an uplink wireless signal output from a wireless device, that is, a radio 120-2 of a firefighter located on the second floor of a building.

As shown in FIG. 2, the uplink radio signal output from the radio 120-2 is transmitted not only to a wireless device in a control room or a disaster prevention room, but also to a wireless device located on another floor of a building.

The uplink radio signal output from the radio 120-2 is input through the TX antenna of the PLA 160-2 disposed on the corresponding floor.

The uplink radio signal of the radio 120-2 is transmitted to the radio 110-1 of the control room and/or the radio 110-2 of the disaster prevention room through the repeater 130 through the uplink line 150.

In addition, as shown in Fig. 2, the radio device of the firefighters located on different floors, that is, the radios 120-1, 120-3, 120-4, and 12-5 are also used as the upstream radio of the radio 120-2. You can see that the signal is being transmitted.

3 is a view showing a detailed detailed view of the repeater constituting the wireless communication system for fire fighting of the present invention shown in FIG. 1 or 2;

3 is a detailed diagram 300 of the repeater 130 constituting the wireless communication system for fire fighting of the present invention shown in FIG. 1 or 2, and shows the components of the RX module 131.

The emergency downlink signal of the situation room and/or the disaster prevention room inputted through the RX input port of the RX module 131 is a fire fighting radio signal of a frequency band of 449 to 450 MHz, as shown in 310 in FIG. 3. The emergency downlink signal 310 of FIG. 3 does not include a pilot signal.

The input signal from the RX module 131 passes through a band pass filter (BPF) 331 and passes only the used frequency band.

The emergency downlink signal that has passed through the BPF 331 is amplified with an appropriate amplitude by the AMP 332.

A splitter 333 diverges the emergency downlink signal into two paths.

The branched main path can adjust the strength of the emergency downlink signal while passing through the ATT (attenuator) 341, and remove the signal out of the required frequency band while passing through the SAW filter 342, and AMP (amplifier) 343 The signal is amplified to an appropriate amplitude as it passes.

The T-PAD (temperature-pad) 344 controls the attenuation according to the temperature of the module as the signal passes and reduces the change in the intensity of the signal according to the temperature, and Step-ATT (setp-attenuator) 345 Allows the user to adjust the signal gain of the main path of the power line amplifier (PLA).

Passing through the BPF 346, only the used frequency band is passed, and the signal is amplified by the AMP 347 to an appropriate amplitude level and input to the combiner 350.

The internal configuration of the repeater module may have different components according to functions and characteristics.

The signal of the branched pilot signal generation path is filtered using the narrow band SAW filter 334 through which only the frequency of the fire fighting radio signal is passed.

The AMP 335 amplifies the filtered signal to an appropriate amplitude level.

The detector (DET) 336 detects whether there is an emergency downlink signal.

The control board 134 uses a result detected by the detector 336 to generate a pilot signal 360 when an emergency downlink signal is detected, a PLL (Phase Lock Loop) 337 control signal. Create

When detecting an emergency downlink signal, the controller 134 generates a pilot signal 360 by powering on the PLL 337.

The pilot signal 360 generated by the PLL 337 is filtered by a low pass filter (LPF) 338.

The pilot signal 360 is filtered by the LPF 338 and then amplified to an appropriate amplitude level through the AMP 339.

The amplified pilot signal 360 is input to a combiner 350 and merged with the emergency downlink signal branched from the tap-off device 333 to the main path.

The combined state of the pilot signal 360 and the emergency downlink signal is shown in the signal 320, and the signal 320 is transmitted to the power line amplifier (PLA) of each floor of the building through the RX output port 360. do.

The merged pilot signal 360 and the emergency downlink signal 320 are shown as having a pilot signal having a frequency of 420MHz and an emergency downlink signal having a frequency band of 449 to 450MHz, but this is only an example, and other frequencies Or it is apparent to those skilled in the art that it may have a frequency band.

However, the pilot signal 360 and the emergency downlink signal have different frequency bands.

FIG. 4 is a diagram showing a detailed detailed view of a power line amplifier (PLA) constituting the wireless communication system for fire fighting of the present invention shown in FIG. 1 or 2.

The emergency downlink signal in which the pilot signal output from the output port of the RX module 131 of the repeater 130 of FIG. 3 is merged is transmitted through a coaxial cable, and the RX of the power line amplifier (PLA) 400 It is input to the input port 401.

The signal input to the RX input port 401 is amplified to an appropriate amplitude level through the AMP 410.

The amplified signal is branched into a main path and a pilot signal monitor path through the divider 411.

The output is branched to the RX output port 403 and the RX ANT port 402 through components of each stage of the main path.

The main path branched through the divider 411 serves to reduce a change in the amplitude level of the signal according to the temperature by adjusting the attenuation amount according to the temperature of the module while passing through the temperature-pad (T-PAD) 416.

The signal outside the required frequency band is removed while passing through the SAW filter 417, and the ATT (setp-attenuator) 345 allows the user to adjust the signal gain of the main path of the power line amplifier (PLA). Make it possible.

The signal is amplified to an appropriate amplitude as it passes through the AMP (amplifier) 419, and is branched into the signal of the RX output port and the signal of the RX ANT port through the divider 424.

The signal of the RX output port is input to the combiner 423 and merged with the signal of the TX ANT port branched from the divider 426 and output to the RX output port 403.

The internal configuration of a power line amplifier (PLA) may have different components depending on functions and characteristics.

The RX output port 403 outputs a signal in which the emergency downlink signal and the pilot signal of the situation room and the disaster prevention room input through the RX input port 401 are combined, and transmits the combined signal to the PLA of another floor inside the building. Deliver.

The signal output to the RX ANT port 402 passes through a pilot rejection filter 420 to remove the pilot signal, and then only the emergency downlink signal is output to the radio of the firefighter of the corresponding floor.

As shown in FIG. 1, the emergency downlink signal from which the pilot signal has been removed is transmitted through a coaxial cable installed on the floor inside the building and emitted to the antenna so that it is received by the fire fighting radio.

The pilot signal monitoring path filters only the pilot signal using the narrowband SAW filter 412.

The AMP 413 amplifies the filtered pilot signal to an appropriate amplitude level.

A detector (DET) 414 monitors the pilot signal and detects the presence or absence of the pilot signal.

When the pilot signal is detected as a result of the detection of the DET 414, the controller operates the RF switch 428 configured at the input terminal of the TX ANT port 405 to change the switch mode to terminating resistors 429. Connect to and block the transmission signal of the firefighter's radio transmitted from the floor where PLA is installed.

It blocks the transmission signal of the radios of the firefighters on each floor, and allows only the emergency downlink signals from the control room and the disaster prevention room to be transmitted to the radios of the firefighters on each floor inside the building.

In addition, when the radio transmission button of the firefighter located inside the building is pressed incorrectly or the transmission button of the radio is pressed due to an accident, the radio transmission signal is continuously transmitted, and it is difficult to transmit an emergency down signal from the situation room and the disaster prevention room. When the set time period has passed by setting the time, the transmission signal of the radio inputted to the PLA (Power Line Amp) TX ANT antenna 405 of the corresponding floor is detected by the input terminal transmission signal detector (DET) 431 and the controller 415 ) Operates the RF switch 428 to block the outgoing signal from the radio of the fire fighter on the floor.

The RF switch 428 of FIG. 4 blocks a wireless uplink signal from the second wireless device to the first wireless device or a communication signal between the second wireless devices (including a continuous transmission signal from the second wireless device) upon detection of a pilot signal. And outputs an emergency downlink signal from the control room and the disaster prevention room to each of the second wireless devices.

However, when the pilot signal is not detected, a wireless uplink signal to the first wireless device or a communication signal between the second wireless devices is transferred.

The first wireless device is a radio (110-1 or 110-2 in FIG. 1) transmitted/received by a user located in a control room or a disaster prevention room, and each of the second wireless devices is located on a different floor inside the building. It is a radio (120-1, 120-2, ..., and 120-5) transmitted/received by each firefighter.

The power line amplifier (PLA) 400 of FIG. 4 includes three dividers 424, 425, and 426 and three combiners 422, 423, and 427.

The distributors 424, 425, and 426 distribute each of the emergency downlink signals, wireless uplink signals, or communication signals between the second wireless devices through different paths.

The combiners 422, 423, and 427 merge and output an emergency downlink signal, a wireless uplink signal, or a communication signal between the second wireless devices from different paths.

Although the number of dividers and couplers is shown as three in FIG. 4, this is only an example and may be configured to include fewer or more distributors and couplers.

Radio devices (120-1, 120) that are transmitted/received by individual firefighters, that is, wireless devices located on each floor of the building by using the power line amplifier (PLA) 400 of each floor configured including a distributor and a combiner. Direct communication between -2, ..., and 120-5) is possible.

Each of the embodiments of the present invention described in detail above may be implemented individually or may be combined with each other and implemented in combination. The present invention described as described above is not limited by the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible without departing from the technical spirit of the present invention. This will be apparent to those of ordinary skill in the art to which the present invention belongs.

Claims (14)

In the fire fighting wireless communication system,
A first wireless device that transmits an emergency downlink signal to a plurality of second wireless devices;
A repeater that generates a pilot signal, merges it with the emergency downlink signal, and outputs the merged signal; And
Upon detection of the pilot signal, a wireless communication signal between the second wireless devices and a wireless uplink signal to the first wireless device are blocked, and the emergency downlink signal combined with the pilot signal is transmitted to each of the second wireless devices. A plurality of output power line amplifiers (PLA: Power Line Amp); including, fire fighting wireless communication system. The method of claim 1,
The first wireless device is a radio that is transmitted/received by a user located in a control room or a disaster prevention room, and each of the second wireless devices is a radio that is transmitted/received by individual firefighters located on different floors of the building. Phosphorus, fire fighting wireless communication system. The method of claim 1,
A frequency band of the emergency downlink signal and a frequency band of the pilot signal are different, and the frequency band of the emergency downlink signal is 449 to 450MHz. The method of claim 2,
Each of the power line amplifier (PLA), characterized in that located on a different floor inside the building, fire fighting wireless communication system. The method of claim 1,
The power line amplifier (PLA) outputs a wireless communication signal between the second wireless devices or a wireless uplink signal to the first wireless device when the pilot signal is not detected. The method of claim 1,
The repeater is
A detector for detecting the emergency downlink signal;
A PLL (Phase Lock Loop) generating the pilot signal;
A controller controlling the PLL according to whether the emergency downlink signal is detected; And
And a combiner (combiner) for merging and outputting the pilot signal and the emergency downlink signal. The method of claim 1,
The power line amplifier is
An outgoing signal detector that detects whether an outgoing signal from the second wireless device is transmitted for a predetermined time period or longer;
When the outgoing signal is transmitted over the time period, further comprising a switch to block the outgoing signal, fire fighting wireless communication system. In the fire fighting power line amplifier (PLA: Power Line Amp),
A first distributor for branching the emergency downlink signal from the first wireless device to the plurality of second wireless devices into a first path and a second path;
A detector for detecting a pilot signal from an emergency downlink signal in the first path;
Upon detection of the pilot signal, a wireless uplink signal from the second wireless device to the first wireless device or a communication signal between the second wireless devices is blocked, and the emergency downlink signal is transmitted to the first wireless device through the second path. A switch for outputting to each of the two wireless devices and transmitting the wireless uplink signal to the first wireless device or a communication signal between the second wireless devices when the pilot signal is not detected; And
Containing, a power line amplifier for fire fighting, a controller for controlling the switch according to whether the pilot signal is detected. The method of claim 8,
The first wireless device is a radio that is transmitted/received by a user located in a control room or a disaster prevention room, and each of the second wireless devices is a radio that is transmitted/received by individual firefighters located on different floors of the building. Phosphorus, power line amplifier for fire fighting. The method of claim 8,
A frequency band of the emergency downlink signal and a frequency band of the pilot signal are different, and the frequency band of the emergency downlink signal is 449 to 450MHz. The method of claim 9,
The power line amplifier (PLA) is composed of a plurality, each characterized in that located on a different floor inside the building, power line amplifier for fire fighting. The method of claim 8,
An outgoing signal detector that detects whether an outgoing signal from the second wireless device is transmitted for more than a predetermined time period; further comprising,
The switch cuts off the outgoing signal when the outgoing signal is transmitted over the time period. The method of claim 8,
A plurality of second splitters for distributing the emergency downlink signal, the wireless uplink signal, or the communication signal between the second wireless devices through different paths; And
A power line amplifier for fire fighting comprising a plurality of combiners for merging and outputting an emergency downlink signal, a wireless uplink signal, or a communication signal between a second wireless device from different paths. The method of claim 13,
Each of the second distributor and each of the couplers, characterized in that consisting of a coupler, power line amplifier for fire fighting.

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