JP7583585B2 - Wireless communication system and wireless communication terminal - Google Patents

Description

The present invention relates to a wireless communication system and a wireless communication terminal.

One type of wireless communication system is a telemetry system (see, for example, Patent Document 1). A telemetry system includes a parent unit and multiple child units. The multiple child units include child units that are directly wirelessly connected to the parent unit and child units that are not directly wirelessly connected to the parent unit. Child units that are not directly wirelessly connected to the parent unit communicate with the parent unit through at least one child unit acting as a relay terminal.

In a telemetry system, when each slave unit is installed, the communication partner of each slave unit may be determined. In this case, the wireless communication route between the master unit and each slave unit is determined in advance. Hereinafter, the predetermined wireless communication route may be referred to as the "basic route." The basic route of a slave unit that does not have a direct wireless connection with the master unit includes at least one slave unit that acts as a relay terminal.

However, a child device (relay terminal) included in the basic route may be unable to perform wireless communication due to some cause (for example, an increase in traffic volume around the child device, or a malfunction). In such a case, the parent device and multiple child devices of the wireless telemetry system of Patent Document 1 form a wireless communication route different from the basic route. Hereinafter, a wireless communication route different from the basic route may be referred to as a "detour route."

JP 2018-207250 A

However, in the wireless telemetry system of Patent Document 1, the user of the center device cannot recognize that a detour route has been formed. If the user of the center device were to recognize that a detour route has been formed, for example, maintenance of the telemetry system (wireless communication system) may be performed earlier, and there is room for improvement in the wireless telemetry system of Patent Document 1.

The present invention was made in consideration of the above problems, and its purpose is to provide a wireless communication system and a wireless communication terminal that allow a user of a center device to recognize that a detour route has been formed.

The wireless communication system of the present invention includes a first wireless communication terminal, a center device, a second wireless communication terminal, and a plurality of third wireless communication terminals. The center device transmits data addressed to the first wireless communication terminal. The second wireless communication terminal receives the data from the center device. When the second wireless communication terminal transfers the data, at least one of the plurality of third wireless communication terminals functions as a relay terminal to form a wireless communication route between the first wireless communication terminal and the second wireless communication terminal, and transfers the data between the first wireless communication terminal and the second wireless communication terminal. The plurality of third wireless communication terminals include a first relay terminal and a second relay terminal. The first relay terminal is included in a basic route, which is the predetermined wireless communication route. The second relay terminal is not included in the basic route. When the first wireless communication terminal receives the data that has passed through the second relay terminal, it transmits detouring information indicating that the data that has passed through the second relay terminal to the center device.

The wireless communication terminal of the present invention is included in the wireless communication system. The wireless communication terminal of the present invention includes a wireless communication unit and a control unit. The wireless communication unit receives the data. When the wireless communication unit receives the data that has passed through the second relay terminal, the control unit causes the wireless communication unit to transmit the detouring information addressed to the center device.

The wireless communication system and wireless communication terminal according to the present invention allow the user of the center device to recognize that a detour route has been created.

1 is a diagram showing a wireless communication system according to a first embodiment of the present invention. FIG. 2 is a block diagram showing a configuration of a slave unit according to the first embodiment of the present invention. FIG. 2 is a block diagram showing the configuration of a parent unit. FIG. 2 is a block diagram showing a configuration of a center device. FIG. 4 is a diagram showing an example of basic route information. 3 is a sequence diagram showing the operations of a center device, a parent device, and a child device in the telemetry system according to the first embodiment of the present invention. FIG. 10 is a sequence diagram showing a process performed when a wireless communication terminal establishes a communication connection with another wireless communication terminal. FIG. 3 is a sequence diagram showing the operations of a center device, a parent device, and a child device in the telemetry system according to the first embodiment of the present invention. FIG. 11 is a sequence diagram showing a process performed when a wireless communication terminal establishes a communication connection with another wireless communication terminal when a detour route is formed. FIG. FIG. 11 is a sequence diagram showing another example in which a communication connection between a parent device and a child device fails. FIG. 13 is a diagram showing an example of a message addressed to a slave unit. 5 is a flowchart showing a process executed by a control unit of the target terminal according to the first embodiment of the present invention. 10 is a flowchart showing a process executed by a control unit of a target terminal according to a second embodiment of the present invention. FIG. 4 is a diagram showing an example of current route information. FIG. 11 is a sequence diagram showing the operations of a center device, a parent device, and a child device in a telemetry system according to a second embodiment of the present invention. FIG. 11 is a sequence diagram showing the operations of a center device, a parent device, and a child device in a telemetry system according to a third embodiment of the present invention. FIG. 11 is a sequence diagram showing the operations of a center device, a parent device, and a child device in a telemetry system according to a fourth embodiment of the present invention. FIG. 13 is a diagram showing a telemetry system according to a fifth embodiment of the present invention. 13 is a flowchart showing a process executed by a control unit of the center device.

Below, an embodiment of the wireless communication system and wireless communication terminal of the present invention will be described with reference to the drawings (Figs. 1 to 19). However, the present invention is not limited to the following embodiment, and can be implemented in various aspects without departing from the gist of the invention. Note that where explanations overlap, they may be omitted as appropriate. Also, in the drawings, the same or equivalent parts are given the same reference symbols, and explanations will not be repeated.

[Embodiment 1]
A first embodiment of the present invention will be described below with reference to Fig. 1 to Fig. 12. First, a wireless communication system 100 according to the present embodiment will be described with reference to Fig. 1. Fig. 1 is a diagram showing the wireless communication system 100 according to the present embodiment. In this embodiment, the wireless communication system 100 is a telemetry system. Hereinafter, the wireless communication system 100 may be referred to as the "telemetry system 100".

As shown in FIG. 1, the telemetry system 100 includes a center device 11, a parent device 21, multiple child devices 22, and multiple meters 23. The parent device 21 is a wireless communication terminal. Each of the multiple child devices 22 is a wireless communication terminal. Hereinafter, when it is not necessary to distinguish between the parent device 21 and the child devices 22, the parent device 21 and the child devices 22 may be referred to as "wireless communication terminals."

The center device 11 is communicatively connected to a wide area wireless network N1 via a center-side network control device 12. The center-side network control device 12 is communicatively connected to a base unit 21 via the wide area wireless network N1. The wide area wireless network N1 is, for example, a PHS (Personal Handy-phone System) network, a FOMA (Freedom Of Mobile Multimedia Access) network, an LTE (Long Term Evolution) network, a 4G (fourth generation mobile communication system) network, or a 5G (fifth generation mobile communication system) network.

The parent device 21 is connected to a plurality of child devices 22 via a narrow-area wireless network N2 so that they can communicate with each other. The frequency band of the narrow-area wireless network N2 is, for example, the 920 MHz band. More specifically, the parent device 21 and the child devices 22 communicate with each other using a specific low-power radio (special low-power radio). Hereinafter, communication using special low-power radio may be referred to as "special low-power wireless communication."

A meter 23 is connected to each of the multiple slave units 22. The meter 23 is installed for each consumer, such as a private home, a company, or various facilities. The meter 23 measures the amount of gas, water, electricity, etc. used, and outputs the measurement results.

The center device 11 transmits data addressed to the slave device 22 to the center-side network control device 12. For example, the center device 11 transmits a message to the slave device 22 requesting the collection of the measurement results of the meter 23.

The center-side network control device 12 is provided, for example, in a public network of a telecommunications carrier. The center-side network control device 12 controls communication between the parent device 21 and the center device 11 via the wide-area wireless network N1.

The master unit 21 receives data addressed to the slave unit 22 from the center device 11 via the wide area wireless network N1 and the center-side network control device 12. The master unit 21 is an example of a second wireless communication terminal of the present invention.

The slave unit 22 receives data addressed to itself that is sent from the center device 11 via the master unit 21. If the received data is a message requesting collection of the measurement results of the meters 23, the slave unit 22 acquires the measurement results from the meters 23 connected to itself, and transmits a response message (data) indicating the acquired measurement results to the master unit 21. The master unit 21 transmits the response message (e.g., data indicating the measurement results) sent from each slave unit 22 to the center device 11 via the wide area wireless network N1 and the center-side network control device 12.

For example, when the meter 23 is a gas meter, the center device 11 is managed by a gas supplier. When the response message indicates the measurement result of the meter 23, the center device 11 acquires data indicating the measurement result of the meter 23 from the response message received from the parent unit 21 via the wide area wireless network N1 and the center side network control device 12, and stores the data for each meter 23. More specifically, the center device 11 stores the measurement result of the meter 23 for each consumer. The center device 11 includes, for example, a server.

In this embodiment, the meter 23 is connected only to the slave unit 22, but the telemetry system 100 may further include a meter 23 connected to the master unit 21. In this case, the master unit 21 acquires the measurement results from the meter 23 connected to itself, and transmits the acquired measurement results to the center device 11 via the wide area wireless network N1 and the center-side network control device 12.

Next, the telemetry system 100 of this embodiment will be further described with reference to FIG. 1. As shown in FIG. 1, the multiple slave units 22 include slave units 22A to 22G. The slave units 22A to 22C are directly wirelessly connected to the master unit 21. The slave units 22D to 22G are connected to the master unit 21 so as to be able to communicate with the master unit 21 using the other slave units 22 as relay terminals. The slave units 22D to 22G are an example of a first wireless communication terminal of the present invention.

The communication partners of the parent device 21 and the multiple child devices 22 are determined in advance. In other words, the wireless communication route between each of the child devices 22 and the parent device 21 is determined in advance. Hereinafter, the predetermined wireless communication route may be referred to as the "basic route."

Specifically, the communication partners of the parent device 21 are the children devices 22A to 22C. The communication partners of the child device 22A are the parent device 21 and the child device 22D. The communication partners of the child device 22B are the parent device 21 and the child device 22G. The communication partners of the child device 22C are the parent device 21 and the child device 22E. The communication partner of the child device 22D is the child device 22A. The communication partners of the child device 22E are the child device 22C and the child device 22F. The communication partner of the child device 22F is the child device 22E. The communication partner of the child device 22G is the child device 22B. For example, the basic route of the child device 22G includes the parent device 21, the child device 22B, and the child device 22G.

The parent unit 21 and the multiple child units 22 store information indicating the basic route that passes through the parent unit 21 and the multiple child units 22. Hereinafter, the information indicating the basic route may be referred to as "basic route information F1."

For example, the parent device 21, the child device 22B, and the child device 22G store basic route information F1 of the child device 22G. Specifically, the parent device 21, the child device 22B, and the child device 22G store that the basic route of the child device 22G includes the parent device 21, the child device 22B, and the child device 22G. For example, the parent device 21, the child device 22B, and the child device 22G store, as the basic route information F1 of the child device 22G, the identification information of the parent device 21, the identification information of the child device 22B, the identification information of the child device 22G, and the data transfer order in the basic route of the child device 22G in association with each other. The identification information includes, for example, the terminal IDs assigned to the parent device 21 and each child device 22.

The child device 22G is communicatively connected to the parent device 21 with the child device 22B acting as a relay terminal. Thus, in the basic route of the child device 22, the child device 22B functions as a relay terminal. Specifically, when the parent device 21 transmits (transfers) data addressed to the child device 22G, the child device 22B forms a wireless communication route between the parent device 21 and the child device 22G based on the basic route information F1 of the child device 22G, and transfers the data addressed to the child device 22G from the parent device 21 to the child device 22G.

In this embodiment, the sub-devices 22A, 22B, 22C, and 22E function as relay terminals in any of the basic routes. Hereinafter, the sub-devices 22 functioning as relay terminals in the basic route may be referred to as the "first relay terminal 22." The sub-devices 22A, 22B, 22C, and 22E are examples of the third wireless communication terminal of the present invention. The sub-devices 22A, 22B, 22C, and 22E are also examples of the first relay terminal of the present invention.

Next, the telemetry system 100 of this embodiment will be further described with reference to FIG. 1. In the telemetry system 100 of this embodiment, when a first relay terminal 22 is unable to wirelessly communicate with other wireless communication terminals on a basic route, data is transferred to the data destination slave unit 22 via a slave unit 22 that is not included in the basic route.

For example, if handset 22B is no longer able to wirelessly communicate with other wireless communication terminals on the basic route of handset 22G, data is transmitted to handset 22G via at least one of the handset 22 (handset 22A and handset 22C to 22F) that is not included in the basic route of handset 22G. Handset 22A and handset 22C to 22F are examples of a third wireless communication terminal and a second relay terminal for the basic route of handset 22G.

Specifically, when handset 22B is no longer able to wirelessly communicate with other wireless communication terminals, data addressed to handset 22G is transferred (sent) from parent device 21 to handset 22G via handset 22A and handset 22D. In other words, when parent device 21 transmits (transfers) data addressed to handset 22G, handset 22A and handset 22D form a wireless communication route between parent device 21 and handset 22G, and transfer the data addressed to handset 22G from parent device 21 to handset 22G.

Alternatively, if handset 22B is no longer able to wirelessly communicate with other wireless communication terminals, data addressed to handset 22G is transferred (sent) from parent device 21 to handset 22G via handset 22C, handset 22E, and handset 22F. In other words, when parent device 21 transmits (transfers) data addressed to handset 22G, handset 22C, handset 22E, and handset 22F form a wireless communication route between parent device 21 and handset 22G, and transfer the data addressed to handset 22G from parent device 21 to handset 22G.

Hereinafter, a handset 22 that is not included in the basic route may be referred to as a "second relay terminal 22." A wireless communication route that is different from the basic route may be referred to as a "detour route." For example, the detour route for handset 22G includes parent device 21, handset 22A (second relay terminal 22), handset 22D (second relay terminal 22), and handset 22G. Alternatively, the detour route for handset 22G includes parent device 21, handset 22C (second relay terminal 22), handset 22E (second relay terminal 22), handset 22F (second relay terminal 22), and handset 22G.

In this embodiment, when the slave device 22, which is the destination of the data, receives the data that has been routed through the second relay terminal 22, it transmits detouring information to the center device 11. In other words, when the slave device 22, which is the destination of the data, receives the data that has been routed through a detouring route, it transmits the detouring information to the center device 11. The detouring information indicates that the data has been received through the second relay terminal 22. Alternatively, the detouring information indicates that the data has been received through a detouring route.

For example, when handset 22G receives data that has passed through handset 22A and handset 22D, it transmits detouring information to center device 11. Alternatively, when handset 22G receives data that has passed through handset 22C, handset 22E, and handset 22F, it transmits detouring information to center device 11. Hereinafter, handset 22, which is the destination of the data, may be referred to as "target terminal 22."

Next, the configuration of the slave unit 22 of this embodiment will be described with reference to Figures 1 and 2. Figure 2 is a block diagram showing the configuration of the slave unit 22 of this embodiment. As shown in Figure 2, the slave unit 22 includes a control unit 221, a storage unit 222, an N2 communication unit 223, and a connection unit 224.

The control unit 221 controls each element of the device (child device 22). For example, the control unit 221 controls the memory unit 222 and the N2 communication unit 223. The control unit 221 includes a processor such as a CPU (Central Processing Unit) or an MPU (Micro Processing Unit). The processor controls each element of the device (child device 22) by executing a computer program stored in the memory unit 222. The control unit 221 and the memory unit 222 may form a microcomputer.

The storage unit 222 stores various computer programs executed by the control unit 221 (processor). The storage unit 222 also stores identification information (e.g., terminal ID) of the device itself (child device 22) and the basic route information F1 described with reference to FIG. 1. The storage unit 222 includes, for example, a ROM (Read Only Memory), a RAM (Random Access Memory), and a semiconductor memory such as a flash memory.

The storage unit 222 further stores hop number information. The hop number indicates which stage from the parent device 21 a wireless communication terminal is. Specifically, the parent device 21 is a wireless communication terminal in the 0th stage. Therefore, the hop number of the parent device 21 is "0". The children devices 22A to 22C are wireless communication terminals in the first stage. Therefore, the hop number of the children devices 22A to 22C is "1". The children devices 22D, 22E, and 22G are wireless communication terminals in the second stage. Therefore, the hop number of the children devices 22D, 22E, and 22G is "2". The child device 22F is a wireless communication terminal in the third stage. Therefore, the hop number of the child device 22F is "2".

In more detail, the hop number information indicates the hop number of the own device as well as the hop number of other devices (other wireless communication terminals). Specifically, the hop number information indicates the hop number of each wireless communication terminal (parent device 21 and each child device 22) included in the telemeter system 100. For example, the child device 22 obtains information indicating the hop number of other devices by exchanging hop number information with the communication partner of the own device.

The storage unit 222 further stores detour conditions that are conditions for determining a wireless communication terminal to which data is transferred when a detour route is formed. The detour conditions include, for example, a first condition to a third condition. The first condition is a condition that data is transferred to the target terminal 22 when the target terminal 22 is included in the wireless communication terminals capable of wireless communication with the own device. The second condition is a condition that data is transferred to a wireless communication terminal that is closer in hop count to the target terminal 22 when the target terminal 22 is not included in the wireless communication terminals capable of wireless communication with the own device. The third condition is a condition that data is transferred to a wireless communication terminal with the largest electric field strength value based on the electric field strength values of radio waves (wireless signals) received from the wireless communication terminals when there are multiple wireless communication terminals that are closer in hop count to the target terminal 22. The detour conditions may include the first condition and one of the second and third conditions.

The N2 communication unit 223 performs wireless communication with other wireless communication terminals. The N2 communication unit 223 is an example of a wireless communication unit of the present invention. The N2 communication unit 223 includes, for example, a communication module having an RF-LSI for 920 MHz band communication.

More specifically, the N2 communication unit 223 has an antenna (not shown). The N2 communication unit 223 transmits and receives wireless signals (radio waves) via the antenna. The N2 communication unit 223 converts (decodes) the received wireless signals into signals that can be processed by the control unit 221, and outputs the signals to the control unit 221. The N2 communication unit 223 also converts the signals output from the control unit 221 to the N2 communication unit 223 into signals that comply with the wireless communication method of the narrow-area wireless network N2 (e.g., the communication method of a special low-power radio). This signal is output to the antenna. As a result, the wireless signals (radio waves) are transmitted from the antenna.

In this embodiment, the N2 communication unit 223 detects the electric field strength value of the radio waves received by the antenna. The N2 communication unit 223 outputs a signal indicating the detected electric field strength value to the control unit 221.

The connection unit 224 is connected to the electric wire PL, which is connected to the meter 23. Therefore, the connection unit 224 is wired to the meter 23 via the electric wire PL. The control unit 221 acquires the measurement results from the meter 23 via the electric wire PL and the connection unit 224.

Now, the process executed by the control unit 221 of the target terminal 22 will be described with reference to Fig. 2. When the N2 communication unit 223 of the target terminal 22 receives data that has passed through the second relay terminal 22 (data that has passed through a detour route), the control unit 221 of the target terminal 22 creates the detour information described with reference to Fig. 1. Then, the control unit 221 of the target terminal 22 causes the N2 communication unit 223 to transmit the detour information addressed to the center device 11.

Next, the configuration of the parent unit 21 will be described with reference to Figures 1 and 3. Figure 3 is a block diagram showing the configuration of the parent unit 21. As shown in Figure 3, the parent unit 21 includes a control unit 211, a memory unit 212, an N1 communication unit 213, and an N2 communication unit 214.

The control unit 211 controls each element of the device (parent device 21). For example, the control unit 211 controls the memory unit 212, the N1 communication unit 213, and the N2 communication unit 214. The control unit 211 includes a processor such as a CPU or MPU. The processor controls each element of the device (parent device 21) by executing a computer program stored in the memory unit 212. The control unit 211 and the memory unit 212 may form a microcomputer.

The storage unit 212 stores various computer programs executed by the control unit 211 (processor). The storage unit 212 also stores identification information (e.g., terminal ID) of the device itself (parent device 21) and basic route information F1 described with reference to FIG. 1. The storage unit 212 further stores hop count information and detouring conditions described with reference to FIG. 2. The storage unit 212 includes semiconductor memory such as ROM, RAM, and flash memory.

The N1 communication unit 213 communicates with the center-side network control device 12 via the wide area wireless network N1. The N1 communication unit 213 is a communication module capable of wide area communication, such as a PHS network, a FOMA network, an LTE network, a 4G network, and a 5G network.

More specifically, the N1 communication unit 213 has an antenna (not shown). The N1 communication unit 213 transmits and receives wireless signals (radio waves) via the antenna. The N1 communication unit 213 converts (decodes) the received wireless signals into signals that can be processed by the control unit 211, and outputs the signals to the control unit 211. The N1 communication unit 213 also converts signals output from the control unit 211 to the N1 communication unit 213 into signals that comply with the wireless communication method of the wide area wireless network N1. This signal is output to the antenna. As a result, the wireless signals (radio waves) are transmitted from the antenna.

The configuration of the N2 communication unit 214 is similar to that of the N2 communication unit 223 of the handset 22 described with reference to Figure 2, so its description will be omitted.

Next, the configuration of the center device 11 will be described with reference to Figures 1 and 4. Figure 4 is a block diagram showing the configuration of the center device 11. As shown in Figure 4, the center device 11 includes a control unit 111, a storage unit 112, a communication unit 113, and a display unit 114.

The control unit 111 controls each element of the device itself (center device 11). For example, the control unit 111 controls the memory unit 112, the communication unit 113, and the display unit 114. The control unit 111 includes a processor such as a CPU or MPU. The processor controls each element of the device itself (center device 11) by executing a computer program stored in the memory unit 112.

The storage unit 112 includes semiconductor memory such as ROM and RAM, and a large-capacity storage medium such as a hard disk drive (HDD). The storage unit 112 stores various computer programs executed by the control unit 111 (processor). The storage unit 112 also stores identification information (e.g., terminal ID) of the master unit 21 and each slave unit 22. The storage unit 112 further stores data indicating the measurement results of the meter 23 for each meter 23.

The communication unit 113 is, for example, a communication module such as a LAN board. The communication unit 113 is connected to the center-side network control device 12 via a wired or wireless connection, and communicates with the center-side network control device 12.

The display unit 114 displays various screens. The display unit 114 is, for example, a display device such as a liquid crystal display device or an organic EL (electroluminescence) display device. When the communication unit 113 receives the detour information described with reference to FIG. 1, the control unit 111 causes the display unit 114 to display, for example, a screen indicating that data (message) has been transmitted to the target terminal 22 via the detour route.

Next, the basic route information F1 will be described with reference to Figures 1 and 5. Figure 5 is a diagram showing an example of the basic route information F1. In detail, Figure 5 shows the basic route information F1 of the child unit 22G. The basic route information F1 of the child unit 22G is stored in the memory unit 222 of the child units 22B and 22G. In addition, the basic route information F1 of the child unit 22G is stored in the memory unit 212 of the parent unit 21.

As shown in FIG. 5, the basic route information F1 may associate the data transfer order F11 from the parent device 21 with the terminal IDs of the wireless communication terminals included in the basic route. For example, as shown in FIG. 5, the basic route information F1 of the child device 22G may associate the terminal ID "XXX0" of the parent device 21, the terminal ID "XXXB" of the child device 22B, and the terminal ID "XXXG" of the child device 22G with the data transfer order F11 from the parent device 21. In the basic route of the child device 22G, the data transfer order from the parent device 21 is the parent device 21 first, the child device 22B second, and the child device 22G third.

Next, data communication in the basic route of the telemetry system 100 will be described with reference to Figures 1 to 6. Figure 6 is a sequence diagram showing the operations of the center device 11, parent device 21, and child device 22 in the telemetry system 100. In detail, Figure 6 shows the operations of the center device 11, parent device 21, child device 22B (first relay terminal 22), and child device 22G (target terminal 22) when the center device 11 and child device 22G communicate along the basic route of child device 22G.

As shown in FIG. 6, when the center device 11 has data to send to the handset 22G, it sends a message D1 addressed to the handset 22G (step S1). In more detail, the message D1 addressed to the handset 22G includes identification information (e.g., terminal ID) of the handset 22G. Hereinafter, the message D1 addressed to the handset 22 may be referred to as a "message D1 addressed to the handset." The message D1 addressed to the handset is sent to the parent device 21 via the center-side network control device 12 and the wide area wireless network N1.

The parent device 21 receives the telegram D1 addressed to the child device via the N1 communication unit 213. When the control unit 211 of the parent device 21 receives the telegram D1 addressed to the child device, it identifies the destination of the telegram D1 addressed to the child device. If the control unit 211 of the parent device 21 determines that the destination of the telegram D1 addressed to the child device is not the parent device (parent device 21), it transfers the telegram D1 addressed to the child device based on the basic route information F1 corresponding to the destination of the telegram D1 addressed to the child device (step S2).

Specifically, the control unit 211 of the parent device 21 obtains from the storage unit 212 basic route information F1 corresponding to the terminal ID specified as the destination in the telegram D1 addressed to the child device. In the example shown in FIG. 6, the destination of the telegram D1 addressed to the child device is the child device 22G. The control unit 211 of the parent device 21 establishes a communication connection with the child device 22B based on the basic route information F1 of the child device 22G, and then transfers the telegram D1 addressed to the child device to the child device 22B via the N2 communication unit 214.

When transferring the message D1 addressed to the child device, the control unit 211 of the parent device 21 adds the identification information (e.g., terminal ID) of the parent device 21 to the header D11 of the message D1 addressed to the child device.

The handset 22B (first relay terminal 22) receives the message D1 addressed to the handset via the N2 communication unit 223. When the control unit 221 of the handset 22B receives the message D1 addressed to the handset, it identifies the destination of the message D1 addressed to the handset.

When the control unit 221 of the slave unit 22B determines that the destination of the telegram D1 addressed to the slave unit is not the slave unit 22B, the control unit 221 transfers the telegram D1 addressed to the slave unit based on the basic route information F1 corresponding to the destination, as in the case of the master unit 21 (step S3). Specifically, the control unit 221 of the slave unit 22B establishes a communication connection with the slave unit 22G based on the basic route information F1 of the slave unit 22G, and then transfers the telegram D1 addressed to the slave unit to the slave unit 22G via the N2 communication unit 223.

When transferring the message D1 addressed to the handset, the control unit 221 of the handset 22B adds identification information (e.g., terminal ID) of the handset itself (handset 22B) to the header D11 of the message D1 addressed to the handset.

The handset 22G (target terminal 22) receives the message D1 addressed to the handset via the N2 communication unit 223. When the control unit 221 of the handset 22G receives the message D1 addressed to the handset, it identifies the destination of the message D1 addressed to the handset.

When the control unit 221 of the handset 22G determines that the destination of the message D1 addressed to the handset is the handset itself (handset 22G), it creates a response message D2 (data) addressed to the center device 11 based on the body D12 of the message D1 addressed to the handset.

Furthermore, when the control unit 221 of the handset 22G determines that the destination of the telegram D1 addressed to the handset is itself (the handset 22G), it determines whether the telegram D1 addressed to the handset is data that has passed through the second relay terminal 22 (data that has passed through a detour route) based on the identification information added to the header D11 of the telegram D1 addressed to the handset and the basic route information F1 of the handset 22G stored in the memory unit 222. Specifically, it determines whether the identification information (e.g., terminal ID) of the first relay terminal 22 included in the basic route information F1 of the handset 22G matches the identification information (e.g., terminal ID) added to the header D11 of the telegram D1 addressed to the handset.

In the example shown in FIG. 6, the electronic message D1 addressed to the slave device is transferred via the basic route. Therefore, the control unit 221 of the slave device 22G determines that the electronic message D1 addressed to the slave device is not data that has been routed through the second relay terminal 22.

If the control unit 221 of the handset 22G determines that the message D1 addressed to the handset is not data that has passed through the second relay terminal 22, it transmits a response message D2 addressed to the center device 11 via the N2 communication unit 223 (step S3).

Specifically, when handset-destined message D1 is transferred from handset 22B to handset 22G, a communication connection is established between handset 22B and handset 22G, and thus control unit 221 of handset 22G transfers response message D2 to handset 22B via N2 communication unit 223.

Similarly, when the telegram D1 addressed to the slave unit is transferred from the master unit 21 to the slave unit 22B, a communication connection is established between the master unit 21 and the slave unit 22B. Therefore, when the control unit 221 of the slave unit 22B receives the response telegram D2 via the N2 communication unit 223, the control unit 221 transfers the response telegram D2 to the master unit 21 via the N2 communication unit 223 (step S4).

When the control unit 211 of the parent device 21 receives the response message D2 via the N2 communication unit 214, the control unit 211 transfers the response message D2 to the center device 11 via the N1 communication unit 213 (step S5). In detail, the N1 communication unit 213 transmits the response message D2 to the center-side network control device 12 via the wide area wireless network N1. As a result, the center-side network control device 12 transmits the response message D2 to the center device 11.

Next, the process when a wireless communication terminal establishes a communication connection with another wireless communication terminal will be described with reference to Figs. 1 to 7. Fig. 7 is a sequence diagram showing the process when a wireless communication terminal establishes a communication connection with another wireless communication terminal. In detail, Fig. 7 shows the operation of the master unit 21 and the slave units 22A to 22C when the master unit 21, which has received a message D1 addressed to the slave unit 22G, establishes a communication connection with the slave unit 22B (first relay terminal 22).

As shown in FIG. 7, when the control unit 211 of the base unit 21 receives a message D1 addressed to the handset 22G by the N1 communication unit 213, it causes the N2 communication unit 214 to continuously transmit a startup request signal addressed to the handset 22B (step S301). The startup request signal is received by a wireless communication terminal installed within the communication range of the base unit 21. In this embodiment, the startup request signal is received by the handset 22A to 22C. For example, the communication range of the special low-power wireless communication is 1 m or more and 1000 m or less.

The startup request signal includes identification information (e.g., terminal ID) of the parent device 21 and destination information. In the example shown in FIG. 7, the startup request signal includes identification information (e.g., terminal ID) of the child device 22B as destination information.

When the control unit 221 of the handset 22A receives a startup request signal via the N2 communication unit 223, the control unit 221 determines whether the destination of the startup request signal is the handset (handset 22A). Specifically, the control unit 221 of the handset 22A determines whether the terminal ID specified as the destination of the startup request signal matches the terminal ID of the handset (handset 22A).

When the control unit 221 of the child device 22A determines that the destination of the activation request signal is not the child device (child device 22A), it causes the N2 communication unit 223 to transmit a beacon signal notifying the identification information (e.g., terminal ID) of the child device (child device 22A) (step S302a). When the control unit 211 of the parent device 21 receives a beacon signal via the N2 communication unit 214, it causes the storage unit 212 to store the identification information included in the beacon signal. In addition, the control unit 211 of the parent device 21 acquires the electric field intensity value of the beacon signal transmitted from the child device 22A from the N2 communication unit 214.

When the control unit 221 of the child device 22B receives the startup request signal via the N2 communication unit 223, it determines whether the destination of the startup request signal is the child device (child device 22B) in the same manner as the child device 22A. If the control unit 221 of the child device 22B determines that the destination of the startup request signal is the child device (child device 22B), it returns an Ack signal via the N2 communication unit 223 in response to the startup request signal (step S302b).

When the control unit 221 of the handset 22C receives a startup request signal via the N2 communication unit 223, it determines whether the destination of the startup request signal is the handset itself (handset 22C), similar to the handset 22A.

When the control unit 221 of the child device 22C determines that the destination of the activation request signal is not the child device (child device 22C), it causes the N2 communication unit 223 to transmit a beacon signal, as in the child device 22A (step S302c). When the control unit 211 of the parent device 21 receives a beacon signal via the N2 communication unit 214, it causes the storage unit 212 to store the identification information (e.g., terminal ID) contained in the beacon signal. In addition, the control unit 211 of the parent device 21 acquires the electric field intensity value of the beacon signal transmitted from the child device 22C from the N2 communication unit 214.

When the control unit 211 of the parent device 21 receives the Ack signal via the N2 communication unit 214, it establishes a communication connection with the wireless communication terminal (child device 22B) that is the destination of the start-up request signal, and then transfers the message D1 addressed to the child device to the child device 22B via the N2 communication unit 214 (step S2).

Next, data communication on the detour route will be described with reference to Figures 1 to 5 and Figure 8. Figure 8 is a sequence diagram showing the operation of the center device 11, the parent device 21, and the child device 22 in the telemetry system 100. In detail, Figure 8 shows the operation of the center device 11, the parent device 21, the child device 22A (second relay terminal 22), the child device 22D (second relay terminal 22), and the child device 22G (target terminal 22) when the center device 11 and the child device 22G communicate along the detour route of the child device 22G.

As shown in FIG. 8, when there is data to be sent to the handset 22G, the center device 11 sends a message D1 addressed to the handset, similar to step S1 in FIG. 6 (step S11).

When the control unit 211 of the parent device 21 receives the message D1 addressed to the child device by the N1 communication unit 213, the control unit 211 executes a process for establishing a communication connection with the child device 22B (step S12), as described with reference to FIG. 7. In the example shown in FIG. 8, the communication connection with the child device 22B fails.

If the communication connection with the handset 22B fails, the control unit 211 of the parent device 21 establishes a communication connection with one of the second relay terminals 22 based on the detouring conditions described with reference to FIG. 2, and then transfers the message D1 addressed to the handset to the second relay terminal 22 via the N2 communication unit 214 (step S13).

In the example shown in FIG. 1, the wireless communication terminals capable of wireless communication with the parent device 21 are the children devices 22A to 22C, and of these, the child device 22B is unable to perform wireless communication for some reason. The hop counts of the remaining wireless communication terminals (child devices 22A and 22C) are all "1". Therefore, the control unit 211 of the parent device 21 transfers the message D1 addressed to the child device to one of the children devices 22A and 22C via the N2 communication unit 214 based on the field strength value of the beacon signal received from each of the children devices 22A and 22C. In the example shown in FIG. 8, the message D1 addressed to the child device is transferred to the child device 22A. When transferring the message D1 addressed to the child device, the control unit 211 of the parent device 21 adds identification information (e.g., terminal ID) of its own device (parent device 21) to the header D11 of the message D1 addressed to the child device.

The control unit 211 of the handset 22A (second relay terminal 22) receives the telegram D1 addressed to the handset via the N2 communication unit 223. When the control unit 221 of the handset 22A receives the telegram D1 addressed to the handset, it identifies the destination of the telegram D1 addressed to the handset.

When the control unit 221 of the handset 22A determines that the destination of the telegram D1 addressed to the handset is not the handset itself (handset 22A), the control unit 221 establishes a communication connection with one of the wireless communication terminals capable of wireless communication with the handset itself (handset 22A) based on the detouring conditions described with reference to FIG. 2, and then transfers the telegram D1 addressed to the handset by the N2 communication unit 223 (step S14). When transferring the telegram D1 addressed to the handset, the control unit 221 of the handset 22A adds identification information (e.g., terminal ID) of the handset itself (handset 22A) to the header D11 of the telegram D1 addressed to the handset.

In the example shown in FIG. 1, the wireless communication terminals capable of wireless communication with handset 22A are parent device 21, child device 22B, and child device 22D. Of these, child device 22B is in a state in which wireless communication is not possible for some reason. Furthermore, of the remaining wireless communication terminals (parent device 21 and child device 22D), the wireless communication terminal closer in hop count to child device 22G is child device 22D. Therefore, as shown in FIG. 8, message D1 addressed to the child device is transferred to child device 22D (second relay terminal 22).

The control unit 211 of the handset 22D (second relay terminal 22) receives the telegram D1 addressed to the handset via the N2 communication unit 223. When the control unit 221 of the handset 22D receives the telegram D1 addressed to the handset, it identifies the destination of the telegram D1 addressed to the handset.

When the control unit 221 of the handset 22D determines that the destination of the message D1 addressed to the handset is not the handset itself (handset 22D), it establishes a communication connection with one of the wireless communication terminals capable of wireless communication with the handset itself (handset 22D) based on the detouring conditions described with reference to FIG. 2, and then transfers the message D1 addressed to the handset via the N2 communication unit 223 (step S15).

In the example shown in FIG. 1, the wireless communication terminals capable of wireless communication with handset 22D are handset 22A and handset 22G. Therefore, based on the detouring condition (first condition), control unit 221 of handset 22D transfers handset-destined message D1 to handset 22G (target terminal 22) via N2 communication unit 223. When transferring handset-destined message D1, control unit 221 of handset 22D adds identification information (e.g., terminal ID) of its own device (handset 22D) to header D11 of handset-destined message D1.

The handset 22G (target terminal 22) receives the message D1 addressed to the handset via the N2 communication unit 223. When the control unit 221 of the handset 22G receives the message D1 addressed to the handset, it identifies the destination of the message D1 addressed to the handset.

When the control unit 221 of the handset 22G determines that the destination of the message D1 addressed to the handset is the handset itself (handset 22G), it creates a response message D2 (response data) addressed to the center device 11 based on the body D12 of the message D1 addressed to the handset.

Furthermore, when the control unit 221 of the handset 22G determines that the destination of the handset-destined message D1 is the handset itself (handset 22G), as described with reference to FIG. 6, it determines whether the handset-destined message D1 is data that has passed through the second relay terminal 22 (data that has passed through a detour route).

In the example shown in FIG. 8, the message D1 addressed to the handset is transferred via a detour route. Therefore, the control unit 221 of the handset 22G determines that the message D1 addressed to the handset is data that has been routed through the second relay terminal 22.

When the control unit 221 of the handset 22G determines that the handset-destined telegram D1 is data that has been routed through the second relay terminal 22, the control unit 221 creates the detouring information described with reference to FIG. 1 and adds the detouring information to the response telegram D2. For example, the control unit 221 of the handset 22G adds flag information indicating that data that has been routed through the second relay terminal 22 has been received to the response telegram D2 as the detouring information.

Thereafter, the control unit 221 of the handset 22G transmits the response telegram D2 with the detour information added to it to the center device 11 via the N2 communication unit 223 (step S16). Specifically, since a communication connection between the handset 22D and the handset 22G is established when the detour route is formed, the control unit 221 of the handset 22G transfers the response telegram D2 with the detour information added to the handset 22D via the N2 communication unit 223.

Similarly, when a detour route is formed, a communication connection is established between the parent device 21 and the child device 22A, and a communication connection is established between the child device 22A and the child device 22D. Therefore, the control unit 221 of the child device 22D transfers the response telegram D2 with the detour information added to the child device 22A via the N2 communication unit 223 (step S17), and the control unit 221 of the child device 22A transfers the response telegram D2 with the detour information added to the parent device 21 via the N2 communication unit 223 (step S18). Then, the control unit 211 of the parent device 21 transfers the response telegram D2 with the detour information added to the center device 11 via the N1 communication unit 213, similar to step S5 in FIG. 6 (step S19).

As explained with reference to FIG. 4, when the control unit 111 of the center device 11 receives the response message D2 with the detour information added thereto via the communication unit 113, it causes the display unit 114 to display a screen indicating that the data (response message D2) has been sent to the target terminal 22 via the detour route.

Next, referring to Figures 1 to 5, 8 and 9, the process when a wireless communication terminal establishes a communication connection with another wireless communication terminal when a detour route is formed will be described. Figure 9 is a sequence diagram showing the process when a wireless communication terminal establishes a communication connection with another wireless communication terminal when a detour route is formed. In detail, Figure 9 shows the operation of the parent device 21 and the children devices 22A to 22C when the parent device 21, which has received a message D1 addressed to the child device 22G, establishes a communication connection with the child device 22A (second relay terminal 22).

9, when the control unit 211 of the parent device 21 receives the telegram D1 addressed to the child device 22G by the N1 communication unit 213, the control unit 211 causes the N2 communication unit 214 to continuously transmit a start request signal addressed to the child device 22B (step S301). As a result, a beacon signal is transmitted from each of the child devices 22A and 22C (steps S302a and 302c). The control unit 211 of the parent device 21 stores the identification information (e.g., terminal ID) contained in the beacon signal in the storage unit 212. The control unit 211 of the parent device 21 also obtains the field intensity value of the beacon signal transmitted from the child device 22A from the N2 communication unit 214, and obtains the field intensity value of the beacon signal transmitted from the child device 22C from the N2 communication unit 214.

In the example shown in FIG. 9, for some reason, the N2 communication unit 223 of the child device 22B cannot receive the startup request signal. Therefore, unlike the example shown in FIG. 7, the child device 22B does not return an Ack signal. As a result, the communication connection between the parent device 21 and the child device 22B fails. Alternatively, if the electric field strength value of the startup request signal received by the N2 communication unit 223 is too low, the control unit 221 of the child device 22B does not execute the process of returning an Ack signal.

If the N2 communication unit 214 does not receive an Ack signal within a predetermined period of time after the start-up request signal is transmitted, the control unit 211 of the parent device 21 determines that the communication connection between the parent device 21 and the child device 22B has failed.

When the control unit 211 of the parent device 21 determines that the communication connection between the parent device 21 and the child device 22B has failed, the control unit 211 causes the N2 communication unit 214 to transmit a startup request signal addressed to one of the child devices 22A and 22C based on the detouring conditions described with reference to FIG. 2 (step S303).

In the example shown in FIG. 1, the hop counts of both child devices 22A and 22C are "1". Therefore, the control unit 211 of the parent device 21 designates one of child devices 22A and 22C as the destination of the startup request signal based on the field strength value of the beacon signal received from each of child devices 22A and 22C. In the example shown in FIG. 9, the destination of the startup request signal is child device 22A.

When the control unit 221 of the child device 22A receives the startup request signal via the N2 communication unit 223, it determines whether the destination of the startup request signal is the child device (child device 22A). If the control unit 221 of the child device 22A determines that the destination of the startup request signal is the child device (child device 22A), it returns an Ack signal via the N2 communication unit 223 in response to the startup request signal (step S304).

When the control unit 211 of the parent device 21 receives the Ack signal via the N2 communication unit 214, it establishes a communication connection with the wireless communication terminal (child device 22A) that is the destination of the startup request signal, and then transfers the message D1 addressed to the child device to the child device 22A via the N2 communication unit 214 (step S305).

Next, referring to FIG. 10, another example of a failed communication connection will be described. FIG. 10 is a sequence diagram showing another example of a failed communication connection between the parent device 21 and the child device 22B. In the example shown in FIG. 10, the Ack signal returned from the child device 22B is not received by the N2 communication unit 214 of the parent device 21. As a result, the control unit 211 of the parent device 21 determines that the communication connection between the parent device 21 and the child device 22B has failed. Alternatively, if the electric field strength value of the start-up request signal received by the N2 communication unit 214 of the parent device 21 is too low, the control unit 211 of the parent device 21 may determine that the communication connection between the parent device 21 and the child device 22B has failed.

Next, the process executed by the control unit 221 of the target terminal 22 will be described with reference to Figs. 1 to 12. Fig. 11 is a diagram showing an example of a message D1 addressed to a slave device. In detail, Fig. 11 shows an example of a message D1 addressed to a slave device 22G via a detour route.

As shown in FIG. 11, the message D1 addressed to the handset includes a header D11 and a body D12. The header D11 is added with identification information (e.g., a terminal ID) of the wireless communication terminal through which the message D1 addressed to the handset is transmitted. Specifically, as shown in FIG. 11, when the message D1 addressed to the handset 22G is transferred to the handset 22G via the parent device 21, the handset 22A, and the handset 22D, the header D11 is added with the terminal ID "XXX0" of the parent device 21, the terminal ID "XXXA" of the handset 22A, and the terminal ID "XXXD" of the handset 22D.

Figure 12 is a flowchart showing the process executed by the control unit 221 of the target terminal 22. As shown in Figure 12, when the N2 communication unit 223 receives a message D1 addressed to the sub-device addressed to the target terminal 22, the control unit 221 of the target terminal 22 determines whether the identification information (e.g., terminal ID) added to the header D11 of the message D1 addressed to the sub-device matches the identification information (e.g., terminal ID) included in the basic route information F1 of the target terminal stored in the memory unit 222 (step S51).

If the control unit 221 of the target terminal 22 determines that the identification information added to the header D11 of the message D1 addressed to the slave device does not match the identification information included in the basic route information F1 of the target terminal 22 stored in the memory unit 222 (No in step S51), it creates detour information (step S52) and transmits the response message D2 with the detour information added thereto to the center device 11 via the N2 communication unit 223 (step S53), thereby terminating the process shown in FIG. 12.

On the other hand, if the control unit 221 of the target terminal 22 determines that the identification information added to the header D11 of the message D1 addressed to the child device matches the identification information included in the basic route information F1 of the target terminal 22 stored in the memory unit 222 (Yes in step S51), the control unit 221 transmits a response message D2 to the center device 11 via the N2 communication unit 223 (step S53), thereby terminating the process shown in FIG. 12.

The first embodiment of the present invention has been described above with reference to Figs. 1 to 12. According to this embodiment, when the target terminal 22 receives data addressed to itself via a detour route, it transmits detour information to the center device 11. This allows the user of the center device 11 to recognize that a detour route has been formed.

[Embodiment 2]
Next, a second embodiment of the present invention will be described with reference to Figures 1 to 11 and 13 to 15. However, only the differences from the first embodiment will be described, and the same matters as in the first embodiment will not be described. The second embodiment differs from the first embodiment in that the center device 11, which has received the detouring information, requests the target terminal 22 for current route information F2.

First, the process executed by the control unit 221 of the target terminal 22 will be described with reference to Figures 1 to 11 and 13. Figure 13 is a flowchart showing the process executed by the control unit 221 of the target terminal 22.

As shown in FIG. 13, when the N2 communication unit 223 receives a message D1 addressed to the sub-device addressed to the target terminal 22, the control unit 221 of the target terminal 22 determines whether the identification information (e.g., terminal ID) added to the header D11 of the message D1 addressed to the sub-device matches the identification information (e.g., terminal ID) included in the basic route information F1 of the target terminal stored in the memory unit 222 (step S61).

If the control unit 221 of the target terminal 22 determines that the identification information added to the header D11 of the message D1 addressed to the child device does not match the identification information included in the basic route information F1 of the target terminal 22 stored in the memory unit 222 (No in step S61), it stores the current route information F2 in the memory unit 222 (step S62).

The current route information F2 indicates the identification information (e.g., terminal ID) of the wireless communication terminal included in the current wireless communication route. In other words, the current route information F2 indicates the identification information of the wireless communication terminal included in the detour route. For example, the control unit 221 of the target terminal 22 stores the identification information (e.g., terminal ID) of the wireless communication terminal added to the header D11 of the message D1 addressed to the child device in the memory unit 222 as the current route information F2.

When the control unit 221 of the target terminal 22 stores the current route information F2 in the storage unit 222, the control unit 221 creates detour information (step S63). In the second embodiment, the control unit 221 of the target terminal 22 creates the flag information described in the first embodiment.

The control unit 221 of the target terminal 22 adds the detouring information (flag information) to the response telegram D2 and transmits the response telegram D2 with the added detouring information to the center device 11 via the N2 communication unit 223 (step S64), thereby completing the process shown in FIG. 13.

On the other hand, if the control unit 221 of the target terminal 22 determines that the identification information added to the header D11 of the message D1 addressed to the child device matches the identification information included in the basic route information F1 of the target terminal 22 stored in the memory unit 222 (Yes in step S61), the control unit 221 transmits a response message D2 to the center device 11 via the N2 communication unit 223 (step S64), thereby terminating the process shown in FIG. 13.

In the process shown in FIG. 13, the control unit 221 of the target terminal 22 creates the detour information after storing the current route information F2 in the storage unit 222. However, the control unit 221 of the target terminal 22 may create the detour information and then store the current route information F2 in the storage unit 222.

Next, the current route information F2 will be described with reference to FIG. 1 and FIG. 14. FIG. 14 is a diagram showing an example of the current route information F2. In detail, FIG. 14 shows the current route information F2 of the child device 22G.

14, the current route information F2 may associate the data transfer order F21 from the parent device 21 with the identification information of the wireless communication terminal included in the detour route. For example, as shown in FIG. 14, the current route information F2 of the child device 22G may associate the terminal ID "XXX0" of the parent device 21, the terminal ID "XXXA" of the child device 22A, and the terminal ID "XXXD" of the child device 22D with the data transfer order F21 from the parent device 21. When the child device 22A and the child device 22D are included in the detour route of the telegram D1 addressed to the child device 22G, the data transfer order from the parent device 21 on the detour route is such that the parent device 21 is first, the child device 22A is second, and the child device 22D is third.

Next, referring to Figures 1 to 11 and Figures 13 to 15, the process in which the center device 11 requests current route information F2 from the target terminal 22 will be described. Figure 15 is a sequence diagram showing the operation of the center device 11, the parent device 21, and the child device 22 in the telemetry system 100. In detail, Figure 15 shows the operation of the center device 11, the parent device 21, the child device 22A (second relay terminal 22), the child device 22D (second relay terminal 22), and the child device 22G (target terminal 22) after the center device 11 receives detour information (flag information) from the child device 22G.

When the control unit 111 of the center device 11 receives the detour information (flag information) from the slave device 22G, it transmits a current route information request signal to the slave device 22G requesting the current route information F2 (step S20).

The current route information request signal is transmitted to the parent device 21 via the center-side network control device 12 and the wide area wireless network N1. The parent device 21 receives the current route information request signal via the N1 communication unit 213. When the control unit 211 of the parent device 21 receives the current route information request signal, it identifies the destination of the current route information request signal.

When the control unit 211 of the parent device 21 determines that the destination of the current route information request signal is not the parent device 21, the N2 communication unit 214 transfers the current route information request signal to the next wireless communication terminal on the current wireless communication route (detour route) (step S21). For example, if the destination of the current route information request signal is the child device 22G and a communication connection is established between the parent device 21 and the child device 22A when the detour route is formed, the current route information request signal is transferred from the parent device 21 to the child device 22A as shown in FIG. 15.

Similarly, if the destination of the current route information request signal is the child device 22G, and when a detour route is formed, a communication connection is established between the child device 22A and the child device 22D, and a communication connection is established between the child device 22D and the child device 22G, the current route information request signal is transferred from the child device 22A to the child device 22G via the child device 22D (steps S22 and S23). As a result, the child device 22G (target terminal 22) receives the current route information request signal by the N2 communication unit 223. When the control unit 221 of the child device 22G receives the current route information request signal, it identifies the destination of the current route information request signal.

When the control unit 221 of the slave unit 22G determines that the destination of the current route information request signal is the slave unit 22G, the control unit 221 transmits the current route information F2 from the N2 communication unit 223 to the center device 11 (step S24).

The current route information F2 sent from the slave unit 22G is transferred to the master unit 21 via the detour route, similar to the response message D2 to which the detour information has been added. For example, in the example shown in FIG. 15, the current route information F2 is transferred from the slave unit 22G to the slave unit 22D (step S24), and then transferred to the master unit 21 via the slave unit 22A (steps S25 and S26). Then, the control unit 211 of the master unit 21 transfers the current route information F2 to the center device 11 via the N1 communication unit 213 (step S27).

When the control unit 111 of the center device 11 receives the current route information F2 via the communication unit 113, it causes the display unit 114 to display a screen showing the current route information F2.

The second embodiment of the present invention has been described above with reference to Figures 1 to 11 and Figures 13 to 15. According to this embodiment, a screen showing current route information F2 is displayed on the display unit 114 of the center device 11. This allows the user of the center device 11 to recognize the detour route (the current wireless communication route).

The control unit 111 of the center device 11 may display information identifying the wireless communication terminal that generated the detour route on the display unit 114. In this case, the user of the center device 11 can be made aware of the wireless communication terminal that generated the detour route. Hereinafter, the wireless communication terminal that generated the detour route may be referred to as the "detour generating terminal."

In more detail, the storage unit 112 of the center device 11 may store each piece of basic route information F1 in the telemetry system 100. In this case, the control unit 111 of the center device 11 can compare the basic route information F1 corresponding to the destination of the current route information request signal with the current route information F2, and identify the first relay terminals 22 that are not included in the current wireless communication route (detour route) from among the first relay terminals 22 included in the basic route, thereby displaying information identifying the detour occurring terminal on the display unit 114. In other words, among the first relay terminals 22 included in the basic route, the first relay terminals 22 that are not included in the current wireless communication route (detour route) are detour occurring terminals.

For example, if the detour route of the handset 22G does not include the handset 22B (first relay terminal 22), the control unit 111 of the center device 11 can identify the handset 22B as the detour occurring terminal by comparing the basic route information F1 of the handset 22G with the current route information F2 of the handset 22G. Therefore, the control unit 111 of the center device 11 can display information indicating that the detour occurring terminal is the handset 22B on the display unit 114.

In addition, in this embodiment, the center device 11 requests the current route information F2 from the target terminal 22, but the center device 11 may request information indicating the terminal where a detour has occurred from the target terminal 22. The control unit 221 of the target terminal 22 can identify the terminal where a detour has occurred by comparing the basic route information F1 of the target terminal 22 itself (the target terminal 22) with the current route information F2, and create information indicating the terminal where a detour has occurred.

[Embodiment 3]
Next, a third embodiment of the present invention will be described with reference to Figures 1 to 7, 9 to 12, 14, and 16. However, only the points different from the first and second embodiments will be described, and the points the same as the first and second embodiments will not be described. The third embodiment differs from the first and second embodiments in that the target terminal 22 transmits current route information F2 to the center device 11 as detour information.

Figure 16 is a sequence diagram showing the operation of the center device 11, the parent device 21, and the child device 22 in the telemetry system 100. In detail, Figure 16 shows the operation of the center device 11, the parent device 21, the child device 22A (second relay terminal 22), the child device 22D (second relay terminal 22), and the child device 22G (target terminal 22) when the center device 11 and the child device 22G communicate along the bypass route of the child device 22G.

As shown in FIG. 16, when there is data to be sent to the handset 22G, the center device 11 sends a message D1 addressed to the handset, similar to step S11 in FIG. 8 (step S31). If the communication connection between the parent device 21 and the handset 22B fails (step S32), the message D1 addressed to the handset is transferred from the parent device 21 to the handset 22G via the handset 22A and handset 22D, similar to steps S13 to S15 in FIG. 8 (steps S33 to S35).

The handset 22G (target terminal 22) receives the message D1 addressed to the handset via the N2 communication unit 223. When the control unit 221 of the handset 22G receives the message D1 addressed to the handset, it identifies the destination of the message D1 addressed to the handset.

When the control unit 221 of the handset 22G determines that the destination of the message D1 addressed to the handset is the handset itself (handset 22G), it creates a response message D2 (response data) addressed to the center device 11 based on the body D12 of the message D1 addressed to the handset.

Furthermore, when the control unit 221 of the handset 22G determines that the destination of the handset-destined message D1 is the handset itself (handset 22G), as described with reference to FIG. 6, it determines whether the handset-destined message D1 is data that has passed through the second relay terminal 22 (data that has passed through a detour route).

When the control unit 221 of the handset 22G determines that the message D1 addressed to the handset is data that has passed through the second relay terminal 22, it creates current route information F2 (detouring information) based on the identification information (e.g., terminal ID) of the wireless communication terminal added to the header D11 of the message D1 addressed to the handset, as described with reference to FIG. 13.

Then, the control unit 221 of the slave device 22G adds the current route information F2 to the response message D2, and transmits the response message D2 with the current route information F2 added to it to the center device 11 via the N2 communication unit 223 (step S36).

The response telegram D2 with the current route information F2 added is transferred to the parent device 21 via the same detour route as the telegram D1 addressed to the child device, as described with reference to FIG. 8. Specifically, in the example shown in FIG. 16, the response telegram D2 with the current route information F2 added is transferred from the child device 22G to the child device 22D (step S36), and then transferred to the parent device 21 via the child device 22A (steps S37 and S38). Then, the control unit 211 of the parent device 21 transfers the response telegram D2 with the current route information F2 added to the center device 11 via the N1 communication unit 213 (step S39).

When the control unit 111 of the center device 11 receives the response message D2 to which the current route information F2 has been added via the communication unit 113, it causes the display unit 114 to display a screen showing the current route information F2.

The third embodiment of the present invention has been described above with reference to Figures 1 to 7, 9 to 12, 14 and 16. According to this embodiment, the target terminal 22 transmits detour information (current route information F2) to the center device 11. Therefore, it is possible to make the user of the center device 11 aware that a detour route has been formed.

The control unit 111 of the center device 11 may display information identifying the detour generating terminal (the wireless communication terminal that generated the detour route) on the display unit 114. In this case, the user of the center device 11 can be made aware of the wireless communication terminal that generated the detour route.

[Embodiment 4]
Next, a fourth embodiment of the present invention will be described with reference to Figures 1 to 7, 9 to 12, 14, and 17. However, only differences from the first to third embodiments will be described, and explanations of the same matters as the first to third embodiments will be omitted. The fourth embodiment differs from the first to third embodiments in that the target terminal 22 transmits detouring terminal information F3 to the center device 11 as detouring information. The detouring terminal information F3 is information indicating the detouring terminal.

Figure 17 is a sequence diagram showing the operation of the center device 11, the parent device 21, and the child device 22 in the telemetry system 100. In detail, Figure 17 shows the operation of the center device 11, the parent device 21, the child device 22A (second relay terminal 22), the child device 22D (second relay terminal 22), and the child device 22G (target terminal 22) when the center device 11 and the child device 22G communicate along the bypass route of the child device 22G.

As shown in FIG. 17, when there is data to be sent to the handset 22G, the center device 11 sends a message D1 addressed to the handset, similar to step S11 in FIG. 8 (step S41). If the communication connection between the parent device 21 and the handset 22B fails (step S42), the message D1 addressed to the handset is transferred from the parent device 21 to the handset 22G via the handset 22A and handset 22D, similar to steps S13 to S15 in FIG. 8 (steps S43 to S45).

The handset 22G (target terminal 22) receives the message D1 addressed to the handset via the N2 communication unit 223. When the control unit 221 of the handset 22G receives the message D1 addressed to the handset, it identifies the destination of the message D1 addressed to the handset.

When the control unit 221 of the handset 22G determines that the destination of the message D1 addressed to the handset is the handset itself (handset 22G), it creates a response message D2 (response data) addressed to the center device 11 based on the body D12 of the message D1 addressed to the handset.

Furthermore, when the control unit 221 of the handset 22G determines that the destination of the handset-destined message D1 is the handset itself (handset 22G), as described with reference to FIG. 6, it determines whether the handset-destined message D1 is data that has passed through the second relay terminal 22 (data that has passed through a detour route).

When the control unit 221 of the handset 22G determines that the telegram D1 addressed to the handset is data that has passed through the second relay terminal 22, it compares the identification information added to the header D11 of the telegram D1 addressed to the handset with the basic route information F1 of the handset 22G stored in the memory unit 222 to identify the detour occurring terminal and create detour occurring terminal information F3.

The detouring terminal information F3 indicates the identification information (e.g., terminal ID) of the wireless communication terminal that generated the detouring route. Specifically, the detouring terminal information F3 indicates the identification information of the first relay terminal 22 that is not included in the current wireless communication route (detouring route) among the first relay terminals 22 included in the basic route of the child device 22G.

When the control unit 221 of the slave device 22G creates the detouring terminal information F3, it adds the detouring terminal information F3 to the response telegram D2, and transmits the response telegram D2 with the detouring terminal information F3 added to it to the center device 11 via the N2 communication unit 223 (step S46).

The response telegram D2 to which the detouring terminal information F3 has been added is transferred to the parent device 21 via the same detouring route as the telegram D1 addressed to the child devices, as described with reference to FIG. 8. Specifically, in the example shown in FIG. 17, the response telegram D2 to which the detouring terminal information F3 has been added is transferred from the child device 22G to the child device 22D (step S46), and then transferred to the parent device 21 via the child device 22A (steps S47 and S48). Then, the control unit 211 of the parent device 21 transfers the response telegram D2 to which the detouring terminal information F3 has been added to the center device 11 by the N1 communication unit 213 (step S49).

When the control unit 111 of the center device 11 receives the response message D2 to which the detouring terminal information F3 has been added via the communication unit 113, it causes the display unit 114 to display a screen showing the detouring terminal information F3.

The fourth embodiment of the present invention has been described above with reference to Figures 1 to 7, 9 to 12, 14 and 17. According to this embodiment, the target terminal 22 transmits detouring information (detouring occurring terminal information F3) to the center device 11. Therefore, it is possible to make the user of the center device 11 aware that a detouring route has been formed. Furthermore, according to this embodiment, it is possible to make the user of the center device 11 aware of the wireless communication terminal that has generated the detouring route.

[Embodiment 5]
Next, a fifth embodiment of the present invention will be described with reference to Figures 2 to 7, 9 to 12, 14, 18, and 19. However, only the differences from the first to fourth embodiments will be described, and the same differences as the first to fourth embodiments will not be described. The fifth embodiment differs from the first to fourth embodiments in the process of identifying a detouring terminal.

Figure 18 is a diagram showing the telemetry system 100 of this embodiment. As shown in Figure 18, the telemetry system 100 of this embodiment includes a center device 11, a parent device 21, a plurality of child devices 22, and a plurality of meters 23. In this embodiment, the plurality of child devices 22 include child devices 22A to 22F.

The communication partners of the parent device 21 and each child device 22 are determined in advance. In other words, the wireless communication route between each child device 22 and the parent device 21 is determined in advance.

Specifically, the communication partners of the parent device 21 are the children devices 22A to 22C. The communication partner of the child device 22A is the parent device 21. The communication partners of the child device 22B are the parent device 21, the children devices 22D, and the children devices 22F. The communication partners of the child device 22C are the parent device 21 and the children devices 22E. The communication partner of the child device 22D is the child device 22B. The communication partner of the child device 22E is the child device 22C. The communication partner of the child device 22F is the child device 22B.

In this embodiment, the basic route of child device 22D includes parent device 21, child device 22B, and child device 22D. The basic route of child device 22F includes parent device 21, child device 22B, and child device 22F. Therefore, child device 22B is included as a first relay terminal 22 in common to the two basic routes. Child device 22B is an example of a common terminal of the present invention. Hereinafter, the first relay terminal 22 that is included in common to multiple basic routes may be referred to as a "common terminal 22."

In this embodiment, as described in embodiment 4, when the target terminal 22 receives data addressed to itself (destined for the target terminal 22) via a detour route, it transmits detour occurrence terminal information F3 to the center device 11. When the control unit 111 of the center device 11 receives the detour occurrence terminal information F3, it stores the detour occurrence terminal information F3 in the storage unit 112.

For example, when a message D1, in which the slave 22D is specified as the destination, is sent to the slave 22D via a wireless communication route (detour route) different from the basic route of the slave 22D, the slave 22D sends the detour occurrence terminal information F3 to the center device 11. Similarly, when a message D1, in which the slave 22F is specified as the destination, is sent to the slave 22F via a wireless communication route (detour route) different from the basic route of the slave 22F, the slave 22F sends the detour occurrence terminal information F3 to the center device 11.

The control unit 111 of the center device 11 determines whether the common terminal 22 is a detour occurrence terminal based on the detour occurrence terminal information F3. In this embodiment, the control unit 111 of the center device 11 determines whether the slave device 22B is a detour occurrence terminal based on the detour occurrence terminal information F3 transmitted from the slave device 22D and the detour occurrence terminal information F3 transmitted from the slave device 22F.

Specifically, when handset 22B (common terminal 22) becomes a detour occurrence terminal, that is, when handset 22B becomes unable to communicate with other wireless communication terminals for some reason, message D1 addressed to handset 22D is sent to handset 22D via the detour route, and message D1 addressed to handset 22F is sent to handset 22F via the detour route. As a result, detour occurrence terminal information F3 is sent from both handset 22D and handset 22F. Therefore, control unit 111 of center device 11 can determine whether handset 22B is a detour occurrence terminal based on detour occurrence terminal information F3 sent from handset 22D and detour occurrence terminal information F3 sent from handset 22F.

Next, the process executed by the control unit 111 of the center device 11 will be described with reference to FIG. 19. FIG. 19 is a flowchart showing the process executed by the control unit 111 of the center device 11. The process shown in FIG. 19 is started when the control unit 111 of the center device 11 receives a response message D2 via the communication unit 113.

When the control unit 111 of the center device 11 receives the response message D2, it determines whether or not the detouring terminal information F3 has been added to the response message D2 (step S71).

If the control unit 111 of the center device 11 determines that the detouring terminal information F3 is not added to the response message D2 (No in step S71), it ends the process shown in FIG. 19.

When the control unit 111 of the center device 11 determines that the detouring terminal information F3 is added to the response telegram D2 (Yes in step S71), it determines whether or not there is detouring terminal information F3 stored in the memory unit 112 that matches the detouring terminal information F3 added to the response telegram D2 (step S72).

When the control unit 111 of the center device 11 determines that there is no detouring terminal information F3 that matches the detouring terminal information F3 added to the response telegram D2 among the detouring terminal information F3 stored in the memory unit 112 (No in step S72), the control unit 111 stores the detouring terminal information F3 added to the response telegram D2 in the memory unit 112 (step S73) and ends the process shown in FIG. 19.

When the control unit 111 of the center device 11 determines that the detouring terminal information F3 stored in the storage unit 112 contains detouring terminal information F3 that matches the detouring terminal information F3 added to the response telegram D2 (Yes in step S72), the control unit 111 increments the counter value for the detouring terminal information F3 that is determined to match (step S74). Specifically, the counter value is incremented by one.

Note that the detouring terminal information F3 stored in the memory unit 112 contains detouring terminal information F3 that matches the detouring terminal information F3 added to the response telegram D2 when the common terminal 22 becomes a detouring terminal. In this embodiment, when the child terminal 22B becomes a detouring terminal and detouring terminal information F3 is transmitted from both the child terminal 22D and the child terminal 22F, the counter value for the identification information (detouring terminal information F3) of the child terminal 22B is increased.

After incrementing the counter value, the control unit 111 of the center device 11 determines whether the counter value is equal to or greater than a threshold value (step S75). The threshold value is, for example, "1."

If the control unit 111 of the center device 11 determines that the counter value is not greater than or equal to the threshold value (No in step S75), it ends the process shown in FIG. 19.

When it is determined that the counter value is equal to or greater than the threshold value (Yes in step S75), the control unit 111 of the center device 11 causes the display unit 114 to display the detour occurrence terminal information F3 for which the counter value is equal to or greater than the threshold value (step S76), and ends the process shown in FIG. 19. That is, the identification information of the common terminal 22 is displayed on the display unit 114 as the identification information of the detour occurrence terminal. In this embodiment, the identification information of the slave 22B (for example, the terminal ID of the slave 22B) is displayed on the display unit 114 as the identification information of the detour occurrence terminal.

The control unit 111 of the center device 11 may reset the counter value a certain period of time after incrementing the counter value.

The fifth embodiment of the present invention has been described above with reference to Figures 2 to 7, 9 to 12, 14, 18, and 19. According to this embodiment, the user of the center device 11 can be made aware that the common terminal 22 has become a detour occurring terminal. Specifically, when the transfer of the message D1 addressed to the child device is no longer performed in a plurality of basic routes and the common terminal 22 included in those basic routes is a detour occurring terminal, the center device 11 notifies the user of the center device 11 that the common terminal 22 has become a detour occurring terminal. Therefore, when the state in which the common terminal 22 is unable to communicate with other wireless communication terminals continues, the user of the center device 11 is notified that the common terminal 22 has become a detour occurring terminal.

In this embodiment, the slave device 22 (target terminal 22) transmits the detour occurrence terminal information F3 to the center device 11 in response to receiving the telegram D1 addressed to the slave device 22 via the detour route. However, as described in the second embodiment, the center device 11 may identify the detour occurrence terminal. Alternatively, as described in the second embodiment, the center device 11 may request the detour occurrence terminal information F3 from the slave device 22 (target terminal 22).

In addition, in this embodiment, the process of determining whether or not a common terminal 22 is a detour occurring terminal has been described using a common terminal 22 included in two basic routes as an example, but a common terminal 22 included in three or more basic routes can also be determined in the same way. When determining whether or not a common terminal 22 included in three or more basic routes is a detour occurring terminal, the threshold value for the counter value may be "2" or more.

The above describes embodiments of the present invention with reference to the drawings (Figs. 1 to 19). However, the present invention is not limited to the above embodiments, and can be implemented in various aspects without departing from the gist of the present invention. In addition, the components disclosed in the above embodiments can be modified as appropriate. For example, a component among all the components shown in one embodiment may be added to a component of another embodiment, or some of all the components shown in one embodiment may be deleted from the embodiment.

The drawings are primarily schematic illustrations of each component to facilitate understanding of the invention, and the thickness, length, number, spacing, etc., of each component shown may differ from the actual configuration due to the convenience of creating the drawings. Furthermore, the configuration of each component shown in the above embodiment is merely an example and is not particularly limited, and it goes without saying that various modifications are possible within a range that does not substantially deviate from the effects of the present invention.

For example, in the embodiment described with reference to Figures 1 to 19, the target terminal 22 transmits the current route information F2 or the detour occurrence terminal information F3 to the center device 11, but the target terminal 22 may transmit both the current route information F2 and the detour occurrence terminal information F3 to the center device 11.

In the embodiment described with reference to Figures 1 to 19, the center device 11 requests the current route information F2 or the detouring terminal information F3 from the target terminal 22, but the center device 11 may request both the current route information F2 and the detouring terminal information F3 from the target terminal 22.

In the embodiment described with reference to Figures 1 to 19, the slave unit 22 and the meter 23 are connected by wire PL, but the slave unit 22 and the meter 23 may be connected wirelessly. Similarly, the master unit 21 and the meter 23 may be connected wirelessly.

The present invention provides a wireless communication system and a wireless communication terminal, and has industrial applicability.

11: Center device 21: Parent device 22: Child device 100: Telemeter system 221: Control unit 222: Storage unit 223: N2 communication unit

Claims (9)

A first wireless communication terminal;
a center device that transmits data addressed to the first wireless communication terminal;
a second wireless communication terminal that receives the data from the center device;
A plurality of third wireless communication terminals;
when the second wireless communication terminal transfers the data, at least one of the plurality of third wireless communication terminals functions as a relay terminal to form a wireless communication route between the first wireless communication terminal and the second wireless communication terminal, and transfers the data between the first wireless communication terminal and the second wireless communication terminal;
The plurality of third wireless communication terminals include
a first relay terminal included in a basic route which is the predetermined wireless communication route;
a second relay terminal that is not included in the basic route;
A wireless communication system in which, when the first wireless communication terminal receives the data via a detour route, which is the wireless communication route that includes the second relay terminal, the first wireless communication terminal transmits detour information indicating that the data was received via the second relay terminal to the center device via the detour route . The first wireless communication terminal,
A wireless communication unit for receiving the data;
2. The wireless communication system according to claim 1, further comprising: a control unit that, when the wireless communication unit receives the data that has passed through the second relay terminal, causes the wireless communication unit to transmit the detouring information addressed to the center device. A first wireless communication terminal;
a center device that transmits data addressed to the first wireless communication terminal;
a second wireless communication terminal that receives the data from the center device;
a plurality of third wireless communication terminals;
Equipped with
when the second wireless communication terminal transfers the data, at least one of the plurality of third wireless communication terminals functions as a relay terminal to form a wireless communication route between the first wireless communication terminal and the second wireless communication terminal, and transfers the data between the first wireless communication terminal and the second wireless communication terminal;
The plurality of third wireless communication terminals include
a first relay terminal included in a basic route which is the predetermined wireless communication route;
a second relay terminal that is not included in the basic route;
Including,
when the first wireless communication terminal receives the data via the second relay terminal, the first wireless communication terminal transmits, to the center device, detouring information indicating that the data via the second relay terminal has been received;
The first wireless communication terminal,
A wireless communication unit for receiving the data;
a control unit that causes the wireless communication unit to transmit the detouring information addressed to the center device when the wireless communication unit receives the data that has passed through the second relay terminal;
Equipped with
the third wireless communication terminal adds its own identification information to the data when transferring the data;
the first wireless communication terminal further includes a storage unit that stores identification information of the first relay terminal;
The control unit is
determining whether or not the identification information added to the data matches the identification information of the first relay terminal stored in the storage unit;
A wireless communication system that, when it is determined that the identification information added to the data does not match the identification information of the first relay terminal stored in the memory unit, transmits the detouring information addressed to the center device to the wireless communication unit. The detour information includes current route information;
The wireless communication system according to claim 1 , wherein the current route information indicates, among the plurality of third wireless communication terminals, a third wireless communication terminal that is included in the current wireless communication route. A first wireless communication terminal;
a center device that transmits data addressed to the first wireless communication terminal;
a second wireless communication terminal that receives the data from the center device;
a plurality of third wireless communication terminals;
Equipped with
when the second wireless communication terminal transfers the data, at least one of the plurality of third wireless communication terminals functions as a relay terminal to form a wireless communication route between the first wireless communication terminal and the second wireless communication terminal, and transfers the data between the first wireless communication terminal and the second wireless communication terminal;
The plurality of third wireless communication terminals include
a first relay terminal included in a basic route which is the predetermined wireless communication route;
a second relay terminal that is not included in the basic route;
Including,
when the first wireless communication terminal receives the data via the second relay terminal, the first wireless communication terminal transmits, to the center device, detouring information indicating that the data via the second relay terminal has been received;
The detouring information includes detouring terminal information,
The detouring terminal information indicates a detouring terminal that is the third wireless communication terminal that is not included in the current wireless communication route among the first relay terminals. A first wireless communication terminal;
a center device that transmits data addressed to the first wireless communication terminal;
a second wireless communication terminal that receives the data from the center device;
a plurality of third wireless communication terminals;
Equipped with
when the second wireless communication terminal transfers the data, at least one of the plurality of third wireless communication terminals functions as a relay terminal to form a wireless communication route between the first wireless communication terminal and the second wireless communication terminal, and transfers the data between the first wireless communication terminal and the second wireless communication terminal;
The plurality of third wireless communication terminals include
a first relay terminal included in a basic route which is the predetermined wireless communication route;
a second relay terminal that is not included in the basic route;
Including,
when the first wireless communication terminal receives the data via the second relay terminal, the first wireless communication terminal transmits, to the center device, detouring information indicating that the data via the second relay terminal has been received;
The detouring information includes flag information indicating that the data was received via the second relay terminal. When the center device receives the flag information, the center device requests at least one of current route information and detouring terminal information from the first wireless communication terminal;
the current route information indicates a third wireless communication terminal included in the current wireless communication route among the plurality of third wireless communication terminals,
The wireless communication system according to claim 6 , wherein the detouring terminal information indicates a detouring terminal that is the third wireless communication terminal that is not included in the current wireless communication route among the first relay terminals. the first wireless communication terminal is a plurality of terminals;
The basic route is a plurality of routes,
the plurality of basic routes correspond to the plurality of first wireless communication terminals;
the first relay terminal includes a common terminal included in common to the plurality of basic routes;
The center device includes:
8. The wireless communication system according to claim 5, further comprising: determining whether or not said common terminal is said detouring terminal based on said detouring terminal information. A wireless communication terminal included in the wireless communication system according to any one of claims 1 to 8,
A wireless communication unit for receiving the data;
a control unit that, when the wireless communication unit receives the data that has passed through the second relay terminal, causes the wireless communication unit to transmit the detouring information addressed to the center device.

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