JP2023032099A - Wiring structure, communication terminal, and radio communication system - Google Patents

Abstract

To detect an unmounted or improperly mounted battery.SOLUTION: A wiring structure includes: a plurality of battery chambers 30 in which respective batteries 26 are loaded; inter-anode wiring 32 which interconnects positive electrode terminals 40P of mutually neighboring battery chambers 30; inter-cathode wiring 33 which interconnects negative electrode terminals 40N of mutually neighboring battery chambers 30; first supply wiring 34 which connects the positive electrode terminal 40P and a load 24 in the battery chamber 30 at one end of the neighboring battery chambers 30; second supply wiring 35 which connects the negative electrode terminal 40N and the load 24 in the battery chamber 30 at the other end of the neighboring battery chambers 30; and switch structures which are respectively provided on the positive electrode terminal 40P and the negative electrode terminal 40N in the battery chambers 30 to achieve electric conduction between a pair of pieces of wiring 22 connected to terminals 40 by the loading of the batteries 26.SELECTED DRAWING: Figure 1

Description

The disclosed technology relates to wiring structures, communication terminals, and wireless communication systems.

For example, there is a technology related to multi-hop communication (Patent Document 1). Patent Literature 1 discloses multi-hop communication in which a packet generated in a communication terminal relays between other communication terminals and reaches a management terminal.

Japanese Patent Application Laid-Open No. 2019-080200

In a typical conventional battery box in which batteries are connected in parallel, even if some of the batteries are not loaded, the wiring is a closed circuit, so that the power is supplied.

Here, when a parallel-connected battery box is used in Patent Document 1, it operates even if some of the batteries are not loaded, so it may not be noticed that some of the batteries are not loaded. be. In addition, since the power consumption of each battery differs depending on the number of batteries loaded, there is a problem that the battery replacement timing differs when managing a plurality of terminals. Therefore, there is a demand for detection of battery leakage and disconnection.

The disclosed technology has been made in view of the above points, and aims to provide a wiring structure, a communication terminal, and a wireless communication system that can detect battery charging omissions and disconnections.

The wiring structure according to the first aspect includes a plurality of battery chambers each loaded with a battery, inter-positive wiring connecting positive terminals of the battery chambers adjacent to each other, and negative terminals of the battery chambers adjacent to each other. a first supply wiring that connects the positive electrode terminal and the load in the battery chamber at one end of the adjacent battery chambers, and a battery chamber at the other end of the adjacent battery chambers a second supply wiring that connects the negative terminal and the load; and a pair of wiring that is provided at the positive terminal and the negative terminal in the battery chamber, and is connected to each terminal when the battery is loaded. and a switch structure for conducting between them.

A communication terminal according to a second aspect includes a battery box having the wiring structure according to the first aspect, and a communication unit that is the load.

A radio communication system according to a third aspect is a radio communication system including a plurality of communication terminals according to the second aspect, wherein the communication unit of each communication terminal transmits from the communication unit of another communication terminal transfer the signal.

According to the disclosed technology, in batteries connected in parallel, a wiring structure is provided in which current is not supplied when some of the batteries are not loaded.

1 is a diagram showing a system outline of a radio communication system; FIG. 1 is a schematic configuration diagram showing a communication terminal according to this embodiment; FIG. 3 is a block diagram showing the hardware configuration of a management terminal according to this embodiment; FIG. 1 is a schematic configuration diagram showing a state in which all batteries are loaded in the communication terminal according to the present embodiment; FIG. FIG. 3 is a schematic configuration diagram showing a communication terminal according to the present embodiment in which some batteries are not present; 7 is a flow chart showing the flow of management processing of the management terminal according to the embodiment;

An example of embodiments of the technology disclosed herein will be described below with reference to the drawings. In each drawing, the same or equivalent components and portions are given the same reference numerals. Also, the dimensional ratios in the drawings are exaggerated for convenience of explanation, and may differ from the actual ratios.

(wireless communication system)
Next, signal transfer in the radio communication system 1 will be described. FIG. 1 is a diagram showing a system outline of a wireless communication system according to this embodiment. As shown in FIG. 1, a radio communication system 1 includes a sign 11 installed on a road, a communication terminal 12 for detecting vehicle collisions, overturns, and the like, and a management terminal 13 . In the wireless communication system 1 , multi-hop communication is configured by the management terminal 13 and each communication terminal 12 . In the following description, when distinguishing between communication terminals and marking tools, they will be described with reference numerals "A", "B", "C", "D" and "E" for distinguishing them. are not distinguished from each other, the description of the above symbols is omitted.

In the wireless communication system 1, the communication terminal 12A, the communication terminal 12B, and the communication terminal 12C are arranged in this order, and the communication terminal 12D, the management terminal 13, and the communication terminal 12E are arranged in this order. Further, another communication terminal 12 may be arranged between the communication terminal 12C and the communication terminal 12D and between the communication terminal 12E and the communication terminal 12A. Illustration of the other communication terminal 12 is omitted.

Hereinafter, in the wireless communication system 1, the direction logically moving away from the management terminal 13, that is, the direction in which the number of hops increases is called the downlink direction, and the opposite direction, that is, the direction logically approaching the management terminal 13 is called the downlink direction. shall be referred to as the upward direction. Also, for convenience of explanation, the management terminal 13 and the communication terminal 12 constituting multi-hop communication are collectively referred to as nodes.

Although the method of determining the communication route in each node constituting multi-hop communication is not limited, for example, a method similar to IEEE 802.15.4/ZigBee (registered trademark) may be applied. . For example, in the wireless communication system 1, a control packet such as a Hello packet is periodically propagated to exchange destination node information, which is information about the node to which the broadcast packet hopped, and the management terminal 13 aggregates this information. , the downlink route to each communication terminal 12 may be calculated and determined by the management terminal 13 . Then, the management terminal 13 transmits information on the determined downlink route to each communication terminal 12 . Then, each communication terminal 12 transfers downstream packets based on the downstream path information notified from the management terminal 13 . Further, each communication terminal 12 may apply a route opposite to the downlink route for the uplink route.

A specific usage scene is a site where a large number of marking tools 11 are arranged on a road to distinguish between a driving lane and a restricted lane.

The marking tool 11 is a marking tool such as a rubber cone placed on the road to prevent entry into the restricted lane. For example, during road construction or the like, the markers 11 are arranged in front of the work site at predetermined intervals over a total length of several kilometers. The predetermined interval is, for example, an interval of several tens of meters to several hundreds of meters.

A communication terminal 12 is provided on each marker 11 . For example, a communication terminal 12A is provided on the sign 11A. Various methods can be widely applied to the method of providing each communication terminal 12 on each marker 11. 12 may be provided.

The communication terminal 12 is a wireless device including at least a sensor and a wireless communication section, and is provided in the marking tool 11 . As the sensor of the communication terminal 12, a sensor that detects a state including overturning or collision of the sign 11 provided with the communication terminal 12 can be applied. The sensor is, for example, an acceleration sensor, a 3-axis acceleration sensor, a posture sensor, or the like.

Also, the communication unit of the communication terminal 12 performs multi-hop communication with the management terminal 13 and other communication terminals 12 . For example, when the traveling vehicle collides with the sign 11 and the sensor detects a collision or overturn, the communication terminal 12 transmits a signal including an identification signal and an abnormality detection message having detection data of the collision or overturn. . At this time, the other communication terminal 12 transfers the received packet to the management terminal 13 by multi-hop communication.

The management terminal 13 is a wireless device that functions as a master station when each communication terminal 12 is a slave station.

A case where some communication terminals 12 do not transmit a signal will be described later.

As described above, in the wireless communication system 1 , the signal transmitted by the communication terminal 12 is transferred to the management terminal 13 by being relayed by another communication terminal 12 .

(communication terminal)
As shown in FIG. 2, the communication terminal 12 is a communication terminal including at least a battery box 20 in which a battery 26 (see FIG. 4) is loaded and a load 24. As shown in FIG. That is, in the communication terminal 12, the load 24 is operated by using the battery 26 as power. Communication terminal 12 has an acceleration sensor as load 24 . The communication terminal 12 also has a communication unit as a load 24 that transmits a signal including an identification signal for identifying itself. The communication unit transmits a signal to another communication terminal 12 or the like using a packet method or the like. The identification signal is, for example, a number assigned to each device, a MAC (Media Access Control) address, an IP (Internet Protocol) address, or the like. In addition to the identification number, the communication unit can also transmit the measurement result of the sensor to another communication terminal 12 or the like. Further, communication terminal 12 receives signals transmitted by other communication terminals 12 . Communication terminal 12 then functions as a repeater in multi-hop communication. That is, the communication terminal 12 transfers the received signal including the identification signal to the other communication terminal 12 .

(wiring structure)
Next, the wiring structure in the communication terminal 12 will be explained. FIG. 2 is a schematic configuration diagram of the communication terminal 12 according to this embodiment. As shown in FIG. 2, the communication terminal 12 includes a battery box 20, wiring 22, a load 24, and a battery . The battery box 20 and the load 24 are connected by a wire 22 , and the power of the battery 26 is supplied to the load 24 by loading the battery 26 into the battery box 20 . Here, loading refers to housing the battery 26 in the correct orientation and position.

The battery box 20 of this embodiment includes four battery chambers 30 . The battery chamber 30 of this embodiment includes a battery chamber 30A, a battery chamber 30B, a battery chamber 30C, and a battery chamber 30D. In the battery box 20, a plurality of battery chambers 30 are arranged adjacent to each other. Specifically, from one end to the other end of the battery box 20, the battery chamber 30A, the battery chamber 30B, the battery chamber 30C, and the battery chamber 30D are arranged in this order. The number of battery chambers 30, that is, the number of batteries 26 to be loaded is set according to the power required by the load 24. FIG.

The battery chamber 30 is an accommodation portion in which the battery 26 is accommodated. Each battery compartment 30 has terminals 40 with switch structures at both ends. The terminal 40 includes a positive terminal 40P at one end of the battery chamber 30 and a negative terminal 40N at the other end of the battery chamber 30. As shown in FIG.

A pair of wires 22 are connected to the terminals 40 of the present embodiment. The terminals 40 as a switch structure have a structure in which a pair of wires 22 connected to each terminal 40 are electrically connected by loading the battery 26 into the battery chamber 30 . The terminal 40 includes a metal fixed contact 50 fixed to the battery chamber 30 and a movable contact 51 fixed to the battery chamber 30 and having a movable metal piece. The fixed contact 50 and the movable contact 51 need only be made of a material that can conduct electricity at the contact portion with the electrode of the battery 26, and the rest of the structure may be made of a non-conducting material such as resin.

One of the pair of wires 22 is connected to the fixed contact 50 , and the other of the pair of wires 22 is connected to the movable contact 51 .

When the battery 26 is not loaded in the battery chamber 30, the metal piece of the movable contact 51 is separated from the fixed contact 50, so the fixed contact 50 and the movable contact 51 are not in contact with each other. As a result, the pair of wirings 22 are not electrically connected.

On the other hand, when the battery 26 is loaded into the battery chamber 30 , the metal piece of the movable contact 51 moves toward the fixed contact 50 and comes into contact with the fixed contact 50 . As a result, the pair of wirings 22 are electrically connected. A case where the battery 26 is loaded in the battery chamber 30 will be described later.

The wiring 22 includes a positive electrode wiring 32 , a negative electrode wiring 33 , a first supply wiring 34 and a second supply wiring 35 . Inter-positive wiring 32 includes inter-positive wiring 32A, inter-positive wiring 32B and inter-positive wiring 32C, and inter-negative wiring 33 includes inter-negative wiring 33A, inter-negative wiring 33B and inter-negative wiring 33C. The wiring 22 becomes a closed circuit when the pair of wirings 22 connected to each terminal 40 are electrically connected by the switch structure.

Each positive electrode wiring 32 is a wiring that connects the positive terminals 40P of the battery chambers 30 adjacent to each other. Specifically, the positive electrode wiring 32A connects between the battery chamber 30A and the battery chamber 30B, the positive electrode wiring 32B connects between the battery chamber 30B and the battery chamber 30C, and the positive electrode wiring 32C connects the battery chamber 30C and the battery. It connects between chambers 30D.

Each inter-negative wiring 33 is a wiring that connects the negative terminals 40N of the battery chambers 30 adjacent to each other. Specifically, the inter-negative wiring 33A connects between the battery chamber 30A and the battery chamber 30B, the inter-negative wiring 33B connects between the battery chamber 30B and the battery chamber 30C, and the inter-negative wiring 33C connects between the battery chamber 30C and the battery. It connects between chambers 30D.

The first supply wiring 34 is wiring that connects the positive terminal 40</b>P and the load 24 in one of the adjacent battery chambers 30 in the battery box 20 . Specifically, the first supply wiring 34 connects the battery chamber 30A and the load 24 .

The second supply wiring 35 is a wiring that connects the load 24 and the negative terminal 40N in the battery chamber 30 at the other end of the adjacent battery chambers 30 in the battery box 20 . Specifically, the second supply wiring 35 connects the battery chamber 30</b>D and the load 24 .

(management terminal)
The management terminal 13 receives the signal transmitted by the communication terminal 12 . Then, the management terminal 13 detects the corresponding communication terminal 12 based on the identification signal. In addition, the management terminal 13 detects communication terminals 12 that have not transmitted a signal, for example, by comparing it with a list of communication terminals 12 created in advance.

Next, the hardware configuration of the management terminal 13 will be explained. FIG. 3 is a block diagram showing the hardware configuration of the management terminal 13. As shown in FIG. As shown in FIG. 3, the management terminal 13 includes a CPU (Central Processing Unit) 131, a ROM (Read Only Memory) 132, a RAM (Random Access Memory) 133, a storage 134, an input section 135, a display section 136, and a communication interface. 137. Each component is communicatively connected to each other via a bus 139 .

The CPU 131 is a central processing unit that executes various programs and controls each section. That is, the CPU 131 reads a program from the ROM 132 or the storage 134 and executes the program using the RAM 133 as a work area. The CPU 131 performs control of the above components and various arithmetic processing according to programs stored in the ROM 132 or the storage 134 . In this embodiment, the ROM 132 or storage 134 stores a management program.

The ROM 132 stores various programs and various data. The RAM 133 temporarily stores programs or data as a work area. The storage 134 is configured by a storage device such as a HDD (Hard Disk Drive) or an SSD (Solid State Drive), and stores various programs including an operating system and various data.

The input unit 135 includes a pointing device such as a mouse and a keyboard, and is used for various inputs.

The display unit 136 is, for example, a liquid crystal display, and displays various information. The display unit 136 may employ a touch panel system and function as the input unit 135 .

The communication interface 137 is an interface for communicating with other devices including the communication terminal 12 . The communication uses, for example, a wired communication standard such as Ethernet (registered trademark) or FDDI, or a wireless communication standard such as 4G, 5G, or Wi-Fi (registered trademark).

(action)
First, the case where all the battery boxes 20 are loaded with the batteries 26 will be described. FIG. 4 is a schematic configuration diagram showing the communication terminal 12 according to the present embodiment in a state in which all the batteries 26 are loaded.

As shown in FIG. 4, when the battery 26 is loaded, the movable contact 51 moves toward the fixed contact 50, and the fixed contact 50 and the movable contact 51 come into contact with each other. As a result, the pair of wirings 22 connected to each terminal 40 becomes conductive. Since the wiring 22 becomes a closed circuit, it is energized.

Specifically, when the battery 26 is loaded into the battery chamber 30A, the first supply wiring 34 and the inter-positive electrode wiring 32A are electrically connected. Similarly, when the battery 26 is loaded in the battery chamber 30B, the wiring 32A between the positive electrodes and the wiring 32B between the positive electrodes are electrically connected. and conduct.

Specifically, when the battery 26 is loaded in the battery chamber 30B, the inter-negative wiring 33A and the inter-negative wiring 33B are electrically connected. Similarly, when the battery 26 is loaded in the battery chamber 30C, the inter-negative wiring 33B and the inter-negative wiring 33C are electrically connected. 35 are electrically connected.

That is, when the batteries 26 are loaded in all the battery chambers 30, the wiring 22 becomes a closed circuit and conducts electricity. Therefore, the communication terminal 12 operates by supplying power to the load 24 from the battery 26 .

Next, the case where the batteries 26 are loaded into some of the battery chambers 30 will be described. FIG. 5 is a schematic configuration diagram showing the communication terminal 12 according to the present embodiment in which some of the batteries 26 are not present.

As shown in FIG. 5, batteries 26 are loaded in the battery chambers 30A, 30B and 30D. Therefore, since the fixed contact 50 and the movable contact 51 in the battery chamber 30A, the battery chamber 30B, and the battery chamber 30D are in contact with each other, a pair of wires connected to each terminal 40 in the battery chamber 30A, the battery chamber 30B, and the battery chamber 30D 22 are electrically connected.

On the other hand, the battery 26 is not loaded in the battery chamber 30C. Therefore, since the fixed contact 50 and the movable contact 51 in the battery chamber 30C are not in contact with each other, the pair of wires 22 connected to the terminals 40 in the battery chamber 30C are not electrically connected. That is, the inter-positive wiring 32B and the inter-positive wiring 32C are not electrically connected. Similarly, the inter-negative wiring 33B and the inter-negative wiring 33C are not electrically connected.

For example, when the battery 26 is not loaded in the battery chamber 30A, the pair of wires 22 connected to the terminals 40 of the battery chamber 30A are not electrically connected. That is, the first supply wiring 34 and the inter-positive wiring 32A are not electrically connected. Also, when the battery 26 is not loaded in the battery chamber 30D, the pair of wires 22 connected to the respective terminals 40 of the battery chamber 30D are not electrically connected. That is, the inter-negative wiring 33C and the second supply wiring 35 are not electrically connected.

When the batteries 26 are not loaded in all the battery chambers 30, the wiring 22 does not become a closed circuit and is not energized. Therefore, since the battery 26 does not supply power to the load 24, the communication terminal 12 does not operate.

Next, the flow of detecting each communication terminal 12 in the management terminal 13 will be described. FIG. 6 is a flow chart showing the flow of management processing by the management terminal 13. As shown in FIG. The processing shown in the figure is executed by the CPU 131 reading out the management program from the ROM 132 or the storage 134, developing it in the RAM 133, and executing it.

In step S<b>101 , CPU 131 receives an identification signal transferred from communication terminal 12 . CPU131 transfers to step S102.

At step S102, the CPU 131 detects the corresponding communication terminal 12 based on the identification signal. CPU131 transfers to step S103.

In step S<b>103 , the CPU 131 records the date and time of reception for each communication terminal 12 . For example, the CPU 131 updates the date and time of reception for each communication terminal 12 in a previously created list of communication terminals 12 constituting the wireless communication system 1 . The CPU 131 proceeds to step S104.

In step S104, the CPU 131 detects communication terminals 12 whose reception date and time have passed a predetermined time. Then, the CPU 131 detects, for example, a communication terminal 12 that has not received an identification signal for 30 minutes or more from the current time, and causes the display unit 136 to display the identification information of the identified terminal. As a result, the CPU 131 can detect the missing or detached battery 26 in the communication terminal 12 that has not transmitted the identification signal. The CPU 131 proceeds to step S101.

Here, the case where the communication terminal 12 does not transmit the identification signal means that the batteries 26 are not loaded in all the battery chambers 30 in the battery box 20 of the communication terminal 12 . That is, when the batteries 26 are not loaded in all the battery chambers 30, power is not supplied to the communication unit, which is the load 24, so the communication terminal 12 does not transmit the identification signal. Here, the case where the battery 26 is not loaded in the battery chamber 30 is, for example, the case where the battery 26 has been forgotten to be loaded during shipping work, or the battery 26 has come off due to vibration during transportation of the communication terminal 12, or the like. .

It should be noted that a step of notifying the user of the communication terminal 12 in which the battery 26 has not been installed or has been detached may be added in response to step S104.

Next, the case where the communication terminal 12B among the plurality of communication terminals 12 is not transmitting a signal will be supplemented.
In FIG. 1, when communication terminal 12B does not transmit an identification signal, communication terminal 12A and communication terminal 12C cannot receive and transfer the identification signal of communication terminal 12B. Therefore, since the management terminal 13 does not receive the identification signal from the communication terminal 12, it detects that the communication terminal 12B is not transmitting the signal by the process of FIG. 6 described above.

As described above, according to the wireless communication system 1 according to the present embodiment, when the batteries 26 are not loaded in all the battery chambers 30 of the communication terminal 12, the wiring 22 of the communication terminal 12 does not become a closed circuit. , the communication unit, which is the load 24, is not fed. Therefore, the communication unit of communication terminal 12 does not transmit a signal including an identification signal to other communication terminals 12 . By detecting communication terminals 12 that are not transmitting signals, the management terminal 13 can detect battery failure or disconnection of the communication terminals 12 .

(remarks)
The wiring structure, communication terminal, and wireless communication system of each embodiment have been described above. However, the present disclosure is not limited to the above embodiments. Various improvements or modifications are possible.

In the communication terminal 12 according to this embodiment, the battery 26 may be a removable power source such as a battery.

In the communication terminal 12 according to this embodiment, the electrode terminal (40N in 30A) opposite to the terminal 40 to which the first supply wiring 34 is connected may have a structure without a switch structure. Also, the terminal of the electrode opposite to the terminal 40 to which the second supply wiring 35 is connected (40P in 30D) may have a structure that does not have a switch structure.

In the communication terminal 12 according to this embodiment, the communication unit may transmit a signal by generating radio waves within a certain range. Also, the communication terminal 12 may receive a signal by intercepting radio waves generated by another communication terminal 12 . Furthermore, in the wireless communication system 1, one communication terminal 12 is placed at a distance where radio waves generated by other communication terminals 12 can be intercepted.

In the communication terminal 12 according to this embodiment, the communication unit may have a structure that always transmits a signal when power is supplied. By simplifying the structure, the cost of the communication unit can be reduced.

In the wireless communication system 1 according to this embodiment, the communication terminal 12 and the management terminal 13 may be integrated. For example, the communication terminal 12 may include a management unit that identifies communication terminals 12 that have not transmitted signals from signals received from other communication terminals 12 .

In the management terminal 13 according to this embodiment, various processors other than the CPU may execute the management processing executed by the CPU reading the software (program) in the above embodiment. The processor in this case is a PLD (Programmable Logic Device) whose circuit configuration can be changed after manufacturing such as an FPGA (Field-Programmable Gate Array), and an ASIC (Application Specific Integrated Circuit) for executing specific processing. A dedicated electric circuit or the like, which is a processor having a specially designed circuit configuration, is exemplified. Also, the management processing may be executed by one of these various processors, or by a combination of two or more processors of the same or different type (for example, multiple FPGAs, a combination of CPU and FPGA, etc.). ) can be run. More specifically, the hardware structure of these various processors is an electric circuit in which circuit elements such as semiconductor elements are combined.

Further, in the above-described embodiment, the management program has been pre-stored (installed) in the computer-readable storage 134, but the present invention is not limited to this. The program is stored in non-transitory storage media such as CD-ROM (Compact Disk Read Only Memory), DVD-ROM (Digital Versatile Disk Read Only Memory), and USB (Universal Serial Bus) memory. may be provided in the form Also, the program may be downloaded from an external device via a network.

1 wireless communication system 11, 11A, 11B, 11C, 11D, 11E sign tool 12, 12A, 12B, 12C, 12D, 12E communication terminal 13 management terminal 20 battery box 22 wiring 24 load 26 battery 30, 30A, 30B, 30C, 30D battery chambers 32, 32A, 32B, 32C positive electrode wiring 33, 33A, 33B, 33C negative electrode wiring 34 first supply wiring 35 second supply wiring 40 terminal 40P positive terminal 40N negative terminal 50 fixed contact 51 movable contact

Claims (5)

a plurality of battery chambers each loaded with a battery;
an inter-positive electrode wiring that connects the positive terminals of the battery chambers adjacent to each other;
Inter-negative wiring that connects the negative terminals of the battery chambers adjacent to each other;
a first supply wiring that connects the positive electrode terminal in the battery chamber at one end of the adjacent battery chambers and a load;
a second supply wiring that connects the negative electrode terminal in the battery chamber at the other end of the adjacent battery chambers and a load;
a switch structure provided at each of the positive electrode terminal and the negative electrode terminal in the battery chamber, and electrically connecting a pair of wires connected to each terminal when the battery is loaded;
wiring structure. The switch structure is
a fixed contact to which one of a pair of wires connected to the terminal is connected;
a movable contact to which the other of a pair of wires connected to the terminal is connected, and which moves toward the fixed contact by loading a battery and comes into contact with the fixed contact;
The wiring structure according to claim 1, comprising: A battery box having the wiring structure according to claim 1 or claim 2;
and a communication unit that is the load. A wireless communication system comprising a plurality of communication terminals according to claim 3,
The communication unit of each communication terminal,
A wireless communication system that transfers a signal transmitted by the communication unit of another communication terminal. further equipped with a management terminal,
Each said communication unit transmits an identification signal for identifying said communication terminal provided with said communication unit,
The wireless communication system according to Claim 4, wherein the management terminal detects the corresponding communication terminal based on the identification signal.

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