JP6501677B2 - Wireless telemeter system and communication device - Google Patents

Description

  The present invention relates to a wireless telemetry system and a communication device that transmit usage amounts of gas, water, electricity, and the like measured by a meter to a communication device at a center side using a wireless network.

  A wireless telemeter system developed for meter reading of gas, water, electricity, etc. is known (see, for example, Patent Document 1). The wireless telemeter system includes a host computer, a center network control device, and the like as a configuration on the center side, and includes a wireless master device, a wireless slave device, and the like as a configuration on the terminal side. The host computer on the center side and the wireless base station on the terminal are communicably connected via a wide area communication network such as a public telephone network, a Personal Handyphone System (PHS) network, or a Freedom Of Mobile multimedia Access (FOMA) network. Be done. Further, the wireless master device on the terminal side and each wireless slave device are communicably connected via a short range wireless network such as a specified low power wireless system.

  Each wireless slave unit is connected to a meter that measures the usage of supplies such as gas, water, electricity, etc. supplied to each consumer, and each wireless slave unit is a measurement result output from the meter ( When the meter reading value is acquired, data including the acquired meter reading value is transmitted to the wireless master through the narrow area wireless network. Also, the wireless master device transmits data of meter readings received from each wireless slave device to the host computer on the center side through the wide area communication network.

  A mesh network is known as one of the terminal side network configurations. In a mesh type network, for example, when the device can receive data transmitted from the outside, periodic beacons are searched to search for another device (wireless master or wireless slave) having data to be transmitted. To send Then, when the wireless master or the wireless slave having data to be transmitted receives the beacon, the wireless master or the wireless slave transmits data to the transmission source of the beacon.

JP 2004-341648

  In a wireless telemetry system, when wireless networks managed by multiple operators are geographically overlapped or placed in close proximity, investment and maintenance management can be achieved by sharing the center and the wireless master by multiple operators. Efficiency can be achieved.

  However, in the case of forming a narrow-area wireless network by mixing wireless handsets of a plurality of carriers capable of communicating with a wireless master in order to share the wireless master with a plurality of carriers, the wireless of one carrier is used. There is a possibility that the wireless slaves of other operators may exist on the communication path from the slave to the wireless master, and relay may be performed between the wireless slaves of different carriers. have.

  In addition, wireless handsets frequently used as relays for communications by other wireless handsets may consume battery quickly, which may cause unfairness among operators in terms of power consumption, maintenance burden, etc. .

  Furthermore, in a small area wireless network in which wireless handsets of a plurality of business operators are mixed, it is not possible to clearly identify which business entity has responsibility for management and operation of the small area wireless network.

  The present invention has been made in view of such circumstances, and in order to share a wireless master device (second wireless device) in a plurality of groups, the wireless slave devices (first wireless devices) of each group are mixed It is an object of the present invention to provide a wireless telemetry system and a communication device capable of avoiding communication between wireless handsets of different groups even when a wireless network is formed.

  The wireless telemeter system of the present application is capable of wireless communication with a plurality of first radios to which a meter is connected and the first radio via a wireless network, and is connected to a communication network different from the wireless network. In a wireless telemetry system comprising a second radio capable of communicating with the selected communication device, each first radio being capable of receiving a signal transmitted from said second radio or another first radio If it is determined that the wireless device can be received, the wireless device ID, which is an identifier of the wireless device, and the wireless device ID of the wireless device among the plurality of groups that classify the respective first wireless devices according to the attribute And a transmitter for intermittently transmitting an ID notification signal including a group ID which is an identifier of a group to which the second radio belongs, and the second radio transmits the radio ID of each first radio and the first radio to the first radio. The identifier of the connected meter A storage unit for storing at least one of the master ID and the group ID of the group to which the first wireless device belongs, and receiving a signal from the communication device addressed to the first wireless device or the meter through the communication network In this case, the determination unit determines the group of the transfer destination to which the received signal should be transferred by referring to the association of each ID stored in the storage unit, and receiving the ID notification signal transmitted from the transmission unit Communication connection for establishing communication connection with the first radio of the transmission source of the ID notification signal when the group ID included in the received ID notification signal corresponds to the group ID of the group determined by the determination unit And a transfer unit configured to transfer a signal from the communication device to the first wireless device that has established communication connection.

  In the wireless telemetry system of the present application, when the second wireless device determines that the second wireless device can receive signals determined by the first wireless device, the second wireless device can receive the signals. A transmitter configured to intermittently transmit an ID notification signal including a wireless device ID, which is an identifier of two wireless devices, and any one group ID, while sequentially changing the group ID, and each first wireless device includes A reception unit for receiving an ID notification signal transmitted from the second radio or the other first radio, and data to be transmitted to the communication device, and an ID received from the second radio When the group ID included in the notification signal corresponds to the group ID of the own device, the data connection to the second wireless device which has a communication connection unit for establishing a communication connection with the second wireless device and causes the communication connection to be established Characterized by transmitting a signal containing To.

  In the wireless telemetry system of the present application, it is determined whether the second radio has a unique group ID assigned to the second radio and can receive signals transmitted from the respective first radios. A determination unit for determining, and a transmission unit for intermittently transmitting an ID notification signal including a wireless device ID that is an identifier of the second wireless device and the unique group ID when it is determined that reception is possible. Each first wireless device includes a storage unit for storing the unique group ID, a receiving unit for receiving an ID notification signal transmitted from the second wireless device or another first wireless device, and the communication device. A communication connection unit for establishing a communication connection with the second wireless device when it has data to be transmitted to and the group ID included in the received ID notification signal corresponds to the unique group ID; Said second established communication connection And transmitting a signal including the data to line unit.

  In the wireless telemetry system of the present application, the second wireless device includes a plurality of bits as an identifier of a group to which the second wireless device belongs, and all the bits in a specific range of the plurality of bits are set to 1 A determination unit that has a group ID and determines whether it can receive a signal transmitted from each first wireless device, and a wireless that is an identifier of the second wireless device when it determines that it can receive a signal A transmitter configured to intermittently transmit an ID notification signal including a device ID and the group ID, wherein each first wireless device has the same number of bits as the group ID of the second wireless device as an identifier of its own group ID notification signal transmitted from the second radio or the other first radio, having a group ID in which any one bit is set to 1 among the bits in the same range as the specific range To receive And the data to be transmitted, and the logical product of each bit of the group ID included in the received ID notification signal and each bit of the group ID of the own group matches the group ID of the own group A communication connection unit for establishing communication connection with a transmission source of the ID notification signal, and transmitting a signal including the data to a transmission source of the ID notification signal for which communication connection has been established.

  In the wireless telemetry system of the present application, the communication connection unit of the first wireless device and the second wireless device has data to be transmitted, and is previously determined with each bit of the group ID included in the received ID notification signal. When the logical product of each of the mask values with each bit is equal to the logical product of each bit of the group ID of its own group and each bit of the mask value, a communication connection is established with the transmission source of the ID notification signal. It is characterized by

  The communication device of the present application is capable of wireless communication via a wireless network with a plurality of wireless devices to which a meter is connected, and communication with an external device connected to a communication network different from the wireless network. A storage unit that stores, in a device, at least one of a wireless device ID that is an identifier of each wireless device and a meter ID that is an identifier of a meter connected to each wireless device, and a group ID of a group to which each wireless device belongs And, when a signal transmitted from the external device is received with one radio or meter as a destination, the association of each ID stored in the storage unit is referred to, and the group of the transfer destination to which the received signal should be transferred The discrimination unit that the discrimination unit that discriminates, the reception unit that receives an ID notification signal including the wireless device ID and the group ID, and the group ID included in the received ID notification signal A communication connection unit for establishing a communication connection with a transmission source of the ID notification signal when the group ID corresponds to a loop group ID; and a transfer unit for transferring a signal from the external device to the transmission source having the communication connection established. It is characterized by having.

  According to the present application, even when the wireless slaves (first wireless devices) of each group are mixed to form a wireless network, in order to share the wireless master (second wireless device) with a plurality of groups. Communication between wireless handsets of different groups can be avoided. As a result, it is possible to eliminate unfairness among operators in terms of power consumption, maintenance burden, etc., and to clarify the position of responsibility such as management responsibility and operation responsibility of the short-range wireless network.

FIG. 1 is a block diagram showing an overall configuration of a wireless telemetry system according to the present embodiment. It is a block diagram which shows the internal structure of NCU. It is a block diagram which shows the internal structure of a gateway radio | wireless machine. It is a block diagram which shows the internal structure of a radio | wireless machine. It is explanatory drawing explaining operation | movement of a gateway radio | wireless machine and a radio | wireless machine. It is an ID management table stored by the gateway radio. It is a schematic diagram which shows an example of a frame structure of RNO. It is a flowchart explaining the procedure of the process which a gateway radio | wireless machine performs. FIG. 13 is an explanatory diagram for explaining the operation of the gateway radio according to the second embodiment. FIG. 18 is an explanatory diagram for explaining the operation of the gateway radio according to the third embodiment. FIG. 18 is an explanatory diagram for explaining the operation of the gateway radio according to the fourth embodiment.

Hereinafter, the present invention will be specifically described based on the drawings showing the embodiments thereof.
Embodiment 1
FIG. 1 is a block diagram showing the overall configuration of a wireless telemetry system according to the present embodiment. The wireless telemeter system according to the present embodiment has NCU 20 (NCU: Network Control Unit), gateway radios 21 such as radios 22A to 22C and meters 23A respectively managed by operators A to C as a configuration on the terminal side. To 23C. Meters 23A-23C are measuring instruments which are installed, for example, for individual customers, such as individual homes, companies, and various facilities, measure usage of gas, water, electricity, etc., and output measurement results (reading values). In the wireless telemetry system, various data output from the terminal side such as data indicating the meter readings of the meters 23A to 23C and data indicating the operation states of the wireless devices 22A to 22C are transmitted to the center 10 using wireless communication. The center 10 transmits various data including control commands for controlling the operations of the wireless devices 22A to 22C and the meters 23A to 23C from the center 10 to the terminal side.

  The center 10 is, for example, a server apparatus for communicating with the terminal side via a wide area wireless network N such as a PHS network or a FOMA network, and accumulating data transmitted from the terminal side.

  The NCU 20 is connected to the wide area wireless network N, and performs wireless communication with the center 10 via the wide area wireless network N. Communication between the NCU 20 and the center 10 is not limited to wireless communication, and may be wired communication. In this case, the NCU 20 and the center 10 are connected by a wired communication network.

  The gateway radio 21 and the NCU are connected via a bus line such as a U bus. The gateway radio 21 is configured to be able to communicate with the center 10 through the NCU 20 connected via a bus line. Also, the gateway radio 21 includes a narrow area radio network NA constructed by the radios 22A, 22A,..., 22A, a narrow area radio network NB constructed by the radios 22B, 22B,. , 22C,..., 22C to communicate with each of the radios 22A to 22C. It is assumed that the short range radio networks NA to NC are distinguished by the network numbers identifying them.

  For example, when each radio 22A belonging to the short range radio network NA acquires a meter reading value from the meter 23A connected to each, data indicating the meter reading value to the gateway radio 21 via the narrow area radio network NA Send. The same applies to each radio 22B belonging to the short range radio network NB and each radio 22C belonging to the short range radio network NC. The gateway radio 21 receives the data transmitted from the radios 22A to 22C through the short range radio networks NA to NC, or when an event to be notified to the center 10 occurs in the own machine, etc. It communicates with 10 and transmits desired data to the center 10.

  In the following description, when it is not necessary to distinguish and describe the radios 22A to 22C belonging to the short range radio networks NA to NC, respectively, the radios 22 are also described. Further, when it is not necessary to distinguish and describe the meters 23A to 23C connected to the wireless devices 22A to 22C, the meters 23 are also described.

  FIG. 2 is a block diagram showing an internal configuration of the NCU 20. As shown in FIG. The NCU 20 includes a control unit 200, a storage unit 201, a wide area wireless communication unit 202, a connection unit 203, a display unit 204, an operation unit 205, and the like. The hardware units included in the NCU 20 are configured to operate with power supplied from an internal battery or an external power supply (not shown).

  The control unit 200 includes, for example, a central processing unit (CPU), a read only memory (ROM), and the like. The CPU in the control unit 200 controls the operation of each of the hardware units described above by executing a control program stored in advance in the ROM. In addition, the control unit 200 may have a function such as a timer that measures an elapsed time from giving a measurement start instruction to giving a measurement end instruction, and a counter that counts the number.

  The storage unit 201 is composed of, for example, a nonvolatile memory such as an EEPROM (Electronically Erasable Programmable Read Only Memory), and information such as setting information on the operation of the NCU 20 and an address of the gateway radio 21 connected to the connection unit 203 Remember etc.

  The wide area wireless communication unit 202 communicates with the center 10 by transmitting or receiving radio waves through the antenna 202a. When the NCU 20 receives, for example, data of meter readings transmitted from the meters 23A to 23C through the wireless devices 22A to 22C and the gateway wireless device 21, the NCU 20 drives the antenna 202a to emit radio waves, thereby the wide-area wireless network N The wide area wireless communication unit 202 is caused to execute processing for transmitting data in a format compliant with the communication standard of

  Further, when the radio wave is received by the antenna 202a, the wide-area wireless communication unit 202 detects the radio wave intensity of the radio wave, and acquires data of a predetermined format by decoding the received radio wave. The received radio waves received by the antenna 202a include, for example, various control commands such as a start command transmitted from the center 10. The wide area wireless communication unit 202 outputs data obtained by decoding the received radio wave to the control unit 200. When the control unit 200 acquires data output from the wide area wireless communication unit 202, the control unit 200 performs various controls based on the data.

  The connection unit 203 includes an interface that connects various devices via a bus line such as a U bus. In the present embodiment, it is assumed that a gateway radio 21 described later is connected to the connection unit 203.

  The display unit 204 is configured of an LED lamp (LED: Light Emitting Diode), a liquid crystal display panel, and the like, and a worker etc. who performs installation work and maintenance work of the NCU 20 based on control signals output from the control unit 200. Display information to be notified.

  The operation unit 205 includes various switches such as a dip switch and a button, and receives various setting operations by a worker or the like. The control unit 200 performs various controls based on the setting content input from the operation unit 205, and stores the setting content in the storage unit 201 as necessary.

  FIG. 3 is a block diagram showing an internal configuration of the gateway radio 21. As shown in FIG. The gateway radio 21 includes a control unit 210, a storage unit 211, a connection unit 212, a short range radio communication unit 213, a display unit 214, an operation unit 215, and the like. The hardware units included in the gateway radio 21 are configured to operate with power supplied from an internal battery or an external power supply (not shown).

  The control unit 210 includes, for example, a CPU, a ROM, and the like. The CPU in the control unit 210 causes the entire device to function as the second wireless device according to the present invention by executing a control program stored in advance in the ROM. Further, the control unit 210 may have a function such as a timer that measures an elapsed time from giving a measurement start instruction to giving a measurement end instruction, a counter that counts the number, and the like.

  The storage unit 211 is configured of, for example, a non-volatile memory such as an EEPROM, and stores setting information related to the operation of the gateway wireless device 21 and a wireless device number assigned to the gateway wireless device 21. And a hop number table. In the present embodiment, a hop number table for associating and storing each radio 22A belonging to the narrow area radio network NA and the number of hops to the radio 22A, each radio 22B belonging to the narrow area radio network NB and the radio A hop number table for associating and storing the hop number leading to the device 22B, and a hop number table individually associating and storing each wireless device 22C belonging to the short range wireless network NC and the hop number leading to the wireless device 22C I assume.

  The connection unit 212 includes an interface for connecting the gateway radio 21 to the connection unit 203 on the NCU 20 side. The gateway radio 21 communicates with the NCU 20 connected via the bus line through the connection unit 212.

  The short range wireless communication unit 213 performs wireless communication with the wireless devices 22, 22,..., 22 by a predetermined wireless communication method by transmitting or receiving a radio wave through the antenna 213 a. As the wireless communication method, for example, a communication method conforming to the U bus air standard is adopted. If the short range wireless communication unit 213 of the gateway wireless device 21 can receive data transmitted from the wireless device 22, the short range wireless network (for example, a narrow range wireless network to which the own device belongs, An ID notification signal (RNO) including the network number of the area wireless network NA) is intermittently transmitted. In addition, when the short range radio communication unit 213 receives the RNO transmitted from the wireless device 22 and the own device has data to be transmitted, the short range radio communication unit 213 transmits the data to the transmission source of the RNO.

  The display unit 214 is configured of an LED lamp, a liquid crystal display panel, etc., and should be notified to a worker etc. who performs installation work and maintenance work of the gateway radio 21 based on a control signal output from the control unit 210. Display information

  The operation unit 215 includes various switches such as dip switches and buttons, and receives various setting operations by a worker or the like. The control unit 210 performs various controls based on the setting content input from the operation unit 215, and stores the setting content in the storage unit 211 as necessary.

  In the present embodiment, the NCU 20 and the gateway radio 21 have been described as separate components, but the NCU 20 and the gateway radio 21 may be integrated with a radio.

  FIG. 4 is a block diagram showing an internal configuration of the wireless device 22. As shown in FIG. The wireless device 22 includes a control unit 220, a storage unit 221, a short range wireless communication unit 222, a connection port 223, a display unit 224, an operation unit 225, and the like. The hardware units included in the wireless device 22 are configured to operate by the power supplied from the battery 229.

  The control unit 220 includes, for example, a CPU, a ROM, and the like. The CPU in the control unit 220 causes the entire device to function as the first wireless device according to the present invention by executing a control program stored in advance in the ROM. Further, the control unit 220 may have a function such as a timer that measures an elapsed time from giving a measurement start instruction to giving a measurement end instruction, a counter that counts the number, and the like.

  The storage unit 221 is configured of, for example, a non-volatile memory such as an EEPROM, and stores setting information on various operations, a wireless device number assigned to the own device, a meter ID of the meter 23 connected to the connection port 223, and the like. Do. In addition, the storage unit 221 includes the wireless device number assigned to each wireless device 22 in the short range wireless network (for example, the short range wireless network NA) to which the own device belongs, and the number of hops to the wireless device 22 It has a hop number table to associate and store.

  The short-range wireless communication unit 222 performs wireless communication with the gateway wireless device 21 and the other wireless devices 22, 22,..., 22 by transmitting or receiving radio waves through the antenna 222 a using a predetermined wireless communication scheme. Do. As the wireless communication method, for example, a communication method conforming to the U bus air standard is adopted. If the short range wireless communication unit 222 of the wireless device 22 can receive data transmitted from the gateway wireless device 21 or another wireless device 22, the short range wireless communication unit 222 of the wireless device 22 may narrow the ID of the own device and the narrow range to which the own device belongs. The RNO including the network number of the wide area wireless network (for example, the short range wireless network NA) is intermittently transmitted. In addition, when the short range radio communication unit 222 receives an RNO transmitted from the gateway radio 21 or another radio 22 and the own apparatus has data to be transmitted, it transmits the data to the RNO. Send to original.

  The connection port 223 connects a meter 23 for measuring usage of gas, water, electricity, and the like. When the connection port 223 acquires a meter reading value from the connected meter 23, the connection port 223 sends data indicating the meter reading value to the control unit 220.

  The display unit 224 is configured of an LED lamp, a liquid crystal display panel, and the like, and information to be notified to a worker who performs installation work and maintenance work of the wireless device 22 based on a control signal output from the control unit 220. Display

  The operation unit 225 includes various switches such as dip switches and buttons, and receives various setting operations by a worker or the like. The control unit 220 performs various controls based on the setting content input from the operation unit 225, and stores the setting content in the storage unit 221 as necessary.

The operations of the gateway radio 21 and the radio 22 will be described below.
FIG. 5 is an explanatory diagram for explaining the operation of the gateway radio 21 and the radio 22. FIG. 6 is an ID management table stored in the gateway radio 21. As shown in FIG. In FIG. 5, the network configuration of the wireless telemetry system is shown in a simplified manner. As described above, the gateway radio 21 can communicate with the radios 22A to 22C belonging to the short range radio networks NA to NC. When gateway radio set 21 receives a signal transmitted from center 10 to radio set 22 or meter 23, gateway radio set 21 identifies the destination of the signal based on the identifier (radio set number of radio set 22 or meter ID of meter 23). Then, it is determined to which network number the narrow area wireless network NA to NC the signal is to be transferred. For this reason, the gateway radio 21 has an ID management table as shown in FIG. The ID management table associates the meter ID which is the identifier of the meter 23, the radio number which is the identifier of the radio 22, and the network number of the narrow area radio network NA (or the narrow area radio network NB, NC) to which the radio 22 belongs. To memorize.

  It is assumed that the gateway radio 21 is assigned a hexadecimal number “0x12345F” as the network number. Further, it is assumed that the hexadecimal number "0x123451" is assigned as the network number to the narrow area wireless network NA formed by the wireless devices 22A, 22A, ..., 22A managed by the provider A. The same applies to the other narrow area wireless networks NB and NC, and it is assumed that hexadecimal numbers “0x123452” and “0x123454” are given, respectively.

  For example, when the meter ID of the meter 23A connected to the wireless device 22A is "AB00155", the meter ID "AB00155", the wireless device number "0x ..." of the wireless device 22A of the connection destination, and the wireless device 22A The network numbers “0x123451” of the belonging short range wireless network NA are associated with one another and stored in the ID management table. Similarly, when the meter ID of the meter 23B connected to the wireless device 22B is "CD00254", the meter ID "CD00254", the wireless device number "0x ..." of the wireless device 22B of the connection destination, and the wireless device 22B If the network number “0x123452” of the narrow area radio network NB to which it belongs is associated and stored in the ID management table, and the meter ID of the meter 23C connected to the wireless device 22C is “EF00353”, the meter ID “EF00353”, The wireless device number “0x...” Of the wireless device 22C of the connection destination and the network number “0x123454” of the short range wireless network NC to which the wireless device 22C belongs are associated with each other and stored in the ID management table.

  When the gateway radio 21 receives the signal addressed to “AB00155” transmitted from the center 10 via the NCU 20, the meter 23A identified by “AB00155” is a short range radio by referring to the ID management table. Since it is known that the wireless device 22A belonging to the network NA is connected, in order to transfer the received signal to the wireless device 22A in the narrow area wireless network NA, the reception waiting for waiting RNO transmitted from the wireless device 22A It becomes a state.

  FIG. 7 is a schematic view showing an example of a frame configuration of RNO. When the gateway radio 21 and each of the radios 22A to 22C have a signal to be transmitted, the gateway radio 21 and each of the radios 22A to 22C are in a state of waiting for reception of an RNO transmitted from a destination to be a transmission destination. The gateway radio 21 and each of the radios 22A to 22C intermittently transmit an RNO (ID notification signal) when it can receive signals transmitted from other apparatuses.

  The RNO frame includes, for example, a physical header, a sequence number, a destination radio number, a group ID, a source radio number, a link control command, the number of consecutive check codes, and a check code. Here, the group ID is an identifier of a group that classifies each wireless device 22 according to the attribute. In the present embodiment, as the group ID, the network numbers of the short range radio networks NA to NC to which each wireless device 22 belongs are used.

  When the gateway radio 21 receives the RNO transmitted from the radio 22A, the gateway radio 21 transmits a request to the transmission source of the RNO (radio 22A), and a link between the gateway radio 21 and the radio 22A. Is established. The gateway radio 21 transmits a signal received from the center 10 to the radio 22 that has established the link.

  When the wireless device 22A determines that the signal received from the gateway wireless device 21 is a signal addressed to the meter 23A connected to the wireless device 22A, the wireless device 22A transfers the signal to the meter 23A connected to the connection port 223. When it is determined that the signal is not for the meter 23A connected to the own device, the wireless device 22A refers to the hop number table stored in the storage unit 221 to set the wireless device 22A as a transfer destination (a narrow-area wireless device The other wireless device 22A) in the network NA is specified, and a state of waiting for RNO sent from the wireless device 22A of the transfer destination is awaited for reception. When the wireless device 22A receives the RNO transmitted from the wireless device 22A of the transfer destination, the wireless device 22A transmits a request to establish a link with the wireless device 22A of the transfer destination, and transfers the signal received from the gateway wireless device 21 To the wireless device 22A. Thereafter, the signal addressed to the meter 23A transmitted from the center 10 is connected to the meter 23A by repeating the process of transmitting and receiving the signal between the two radios 22A and 22A in the short range radio network NA as necessary. Reaches the meter 23A through the wireless device 22A.

The same applies to the signal to the meter 23B in the narrow area radio network NB transmitted from the center 10 and the signal to the meter 23C in the narrow area radio network NC, and one or more in the narrow area radio network NB. The destination meter 23B or 22C is reached via the radio 22B or one or more radios 22C in the short range radio network NC.
The signals transmitted from the radios 22A to 22C and the meters 23A to 23C to the center 10 are transmitted via the radios 22A to 22C and the gateway radio 21 in the narrow area radio networks NA to NC to which they belong. It is transmitted to the center 10.

  FIG. 8 is a flow chart for explaining the procedure of processing executed by the gateway radio 21. The control unit 210 of the gateway radio 21 determines whether the signal addressed to the meter 23 transmitted from the center 10 has been received through the NCU 20 connected to the connection unit 212 (step S101).

  If it is determined that the signal addressed to the meter 23 has been received (S101: YES), the control unit 210 refers to the ID management table stored in the storage unit 211, and determines the distribution destination of the received signal (step S102) . For example, when a signal whose destination is the meter 23A is received, the control unit 210 determines the distribution destination of the received signal as the narrow area radio network NA.

  The control unit 210 determines whether or not the RNO transmitted from the determined assignment destination wireless device 22 (for example, the wireless device 22A belonging to the short range wireless network NA) has been received through the short range wireless communication unit 213 (step S103). When the RNO has not been received (S103: NO), the control unit 210 stands by until the RNO transmitted from the distribution destination radio device 22 is received.

  When the RNO transmitted from the distribution destination radio device 22 is received (S103: YES), the control unit 210 transmits a request to the transmission source of the RNO through the short range radio communication unit 213 (step S104).

  Next, the control unit 210 determines whether the narrow area wireless communication unit 213 has received RACK transmitted from the wireless device 22 as a response to the request (step S105). When RACK is not received (S105: NO), the control unit 210 waits until receiving RACK transmitted from the wireless device 22.

  If it is determined that the RACK has been received (S105: YES), the control unit 210 establishes a link with the wireless device 22 that is the transmission source of the RACK (step S106), and transmits the signal addressed to the meter 23 to the narrow area wireless communication unit It transmits through 213 (step S107).

  When it is determined in step S101 that the signal addressed to the meter 23 is not received (S101: NO), the control unit 210 determines whether the narrow area wireless communication unit 213 received the signal addressed to the center 10 or not. (Step S108).

  When the signal addressed to the center is received (S108: YES), the control unit 210 transmits the received signal to the center 10 through the NCU 20 connected to the connection unit 212 (step S109). When the signal addressed to the center has not been received (S108: NO), the control unit 210 returns the process to step S101.

  As described above, in the first embodiment, when the gateway radio 21 receives the signal addressed to the meter 23 transmitted from the center 10, transmission is performed according to the group of the radios 22 to which the destination meter 23 is connected. By performing the prior allocation, wireless communication between the wireless devices 22 belonging to different groups is avoided.

Second Embodiment
In the second embodiment, a configuration in which radios 22A to 22C belonging to a plurality of short range radio networks NA to NC share one gateway radio 21 will be described.
The overall configuration of the wireless telemetry system and the internal configurations of the NCU 20, the gateway wireless device 21 and the wireless device 22 in the second embodiment are the same as in the first embodiment, and thus the description thereof will be omitted.

  FIG. 9 is an explanatory diagram for explaining the operation of the gateway radio 21 according to the second embodiment. The gateway radio 21 according to the second embodiment receives the signals transmitted from the radios 22A to 22C and transfers them to the center 10, the network numbers of the narrow area radio networks NA to NC (0x123451, 0x123452, 0x123454). Is stored in the storage unit 211.

  When the gateway radio 21 is in a state capable of receiving a signal transmitted from the radio 22, the gateway radio 21 sequentially transmits RNOs including the respective network numbers as group IDs through the short range radio communication unit 213. For example, after transmitting an RNO including a network number “0x123451” as a group ID at a certain timing, the gateway radio 21 transmits an RNO including a network number “0x123452” as a group ID at a next timing, and further, At the next timing, an RNO including the network number "0x123454" as a group ID is transmitted.

  When the radio 22A capable of directly communicating with the gateway radio 21 has a signal to be transmitted to the center 10, the network number of the narrow area radio network NA of the RNOs transmitted from the gateway radio 21 is set to the group ID It will be in the state of waiting for reception to wait for RNO containing as. When the radio 22A receives from the gateway radio 21 an RNO including the network number (0x123451) of the short range radio network NA as a group ID, the radio 22A transmits a request to the gateway radio 21 and links with the gateway radio 21 Be established. After establishing a link with the gateway radio 21, the radio 22A transmits a signal addressed to the center 10 to the gateway radio 21.

  The operation of the radios 22B and 22C capable of directly communicating with the gateway radio 21 is the same as that of the radio 22A. That is, when there are signals to be transmitted to the center 10, the radios 22B and 22C respectively group the network numbers (0x123452, 0x123454) of the narrow area radio networks NB and NC among the RNOs transmitted from the gateway radio 21. It will be in the state of waiting for reception waiting for RNO included as an ID. When the radios 22 B and 22 C receive the RNO including their network numbers, they transmit a request to the gateway radio 21 to establish a link, and transmit a signal addressed to the center 10 to the gateway radio 21.

  As described above, in the second embodiment, the gateway radio 21 sequentially transmits a plurality of types of RNOs having different network IDs, whereby the plurality of radios 22A to 22C belonging to the plurality of narrow area radio networks NA to NC are transmitted. Can share one gateway radio 21. Further, in the second embodiment, since one gateway radio 21 emulates a plurality of gateway radios, a plurality of narrow areas are added without adding new functions to the radios 22A to 22C. The wireless networks NA to NC can be handled by one gateway radio 21.

Third Embodiment
In the third embodiment, when the gateway radio 21 and each of the radios 22A to 22C store the network ID of each other and receive the RNO including the network number stored therein as the group ID, the link is established. The configuration to be made will be described.
The overall configuration of the wireless telemetry system and the internal configurations of the NCU 20, the gateway radio 21 and the radio 22 in the third embodiment are the same as those in the first embodiment, and therefore the description thereof will be omitted.

  FIG. 10 is an explanatory diagram for explaining the operation of the gateway radio 21 according to the third embodiment. It is assumed that a unique network number (for example, 0x123456) is assigned to the gateway radio 21 according to the third embodiment in advance. The gateway radio 21 also receives the network numbers ("0x123451", "0x123452", "0x123452", "0x123452") in order to receive the signals transmitted from the radios 22A to 22C and transfer them to the center 10. “0x123454” is stored in the storage unit 211.

  On the other hand, each of the wireless devices 22A to 22C belonging to the short range wireless networks NA to NC stores the network number assigned thereto and the network number (0x123456) of the gateway wireless device 21 in the storage unit 221.

  When the gateway radio 21 is in a state capable of receiving a signal transmitted from the radio 22, the gateway radio 21 transmits, via the narrow area radio communication unit 213, an RNO including the network number (0x123456) of its own as a group ID.

  When the radio set 22A receives an RNO transmitted from the gateway radio 21 and has a signal to be transmitted to the center 10, the group ID (0x123456) included in the received RNO is stored in the storage unit 221. Since it matches with the stored network number, it is determined that the transmission source of the RNO (gateway radio 21) is a valid transmission destination. After transmitting the request to the received RNO, the wireless device 22A establishes a link with the gateway wireless device 21, and transmits a signal to be transmitted to the center 10 to the gateway wireless device 21 through the short range wireless communication unit 222. .

  The radios 22B and 22C belonging to the short range radio networks NB and NC are the same as the radio 22A. That is, when the wireless devices 22B and 22C receive the RNO transmitted from the gateway wireless device 21 and have a signal to be transmitted to the center 10, the group ID (0x123456) included in the received RNO is Since it matches the network number stored in the storage unit 221, it is determined that the transmission source of the RNO (gateway radio 21) is a valid transmission destination. After transmitting the request to the received RNO, the radios 22B and 22C establish a link with the gateway radio 21 and transmit a signal to be transmitted to the center 10 to the gateway radio 21 through the short range radio communication unit 222. Send.

  As described above, in the third embodiment, the gateway radio 21 has a unique network number, and the gateway radio 21 and each of the radios 22A to 22C store a network ID of each other, thereby a plurality of narrow areas. One gateway radio 21 can be shared by the plurality of radios 22A to 22C belonging to the radio networks NA to NC.

Embodiment 4
In the fourth embodiment, a configuration will be described in which the legitimacy of the transmission destination is determined by the logical operation of the network number assigned to the gateway radio 21 and the network numbers of the respective narrow area radio networks NA to NC.
The overall configuration of the wireless telemetry system and the internal configurations of the NCU 20, the gateway radio 21 and the radio 22 in the fourth embodiment are the same as those in the first embodiment, and therefore the description thereof will be omitted.

  FIG. 11 is an explanatory diagram for explaining the operation of the gateway radio 21 according to the fourth embodiment. It is assumed that a unique network number (for example, 0x12345F) is assigned in advance to the gateway radio 21 according to the fourth embodiment. The network number assigned to the gateway radio unit 21 is characterized in that all the specific range (lower 4 bits) in the arrangement of each bit is set to "1". The gateway radio 21 stores its own network number and a mask value, which will be described later, in the storage unit 211.

  On the other hand, the network numbers of the short range radio networks NA to NC are set to, for example, “0x123451”, “0x123452”, and “0x123454”. These network numbers are characterized in that any one bit in a specific range (lower 4 bits) in each bit sequence is set to “1” and the remaining 3 bits are set to “0”. That is, the lower four bits of the network number of the short range radio network NA are set to "0001". The lower four bits of the network number of the short range wireless network NB are set to "0010", and the lower four bits of the network number of the short range wireless network NC are set to "0100".

  When the gateway radio 21 receives an RNO, the "logical AND of each bit of its own network number and the mask value" is equal to "the logical AND of each bit of the communication other's network number and the mask value" , It is determined that the other party is a valid communication partner. Here, “0xFFFFF0” can be used as the mask value.

  For example, when the gateway radio 21 receives an RNO from the radio 22A, the logical product of each bit of “0x12345F” and “0xFFFFF0” is “0x123450”, and each bit of “0x123451” and “0FFFFF0” Since the logical product of is “0x123450” and both are equal, it can be determined that the wireless device 22A is a valid communication counterpart. The same applies to the case where the gateway radio 21 receives RNO from the radios 22B and 22C, and it can be determined that each is a valid communication counterpart.

  If an RNO transmitted from a radio (not shown) belonging to the wireless network (not shown) of another carrier having a network number of “0x234561” is received, the logical product of each bit of “0x12345F” and “0xFFFFF0” is Since "0x123450" and the logical product of each bit of "0x234561" and "0FFFFF0" is "0x234560" and they are different, the gateway radio 21 determines that the radio is not a valid communication partner. can do.

  On the other hand, when the wireless device 22 receives the RNO, "the logical product of each bit of the network number of its own device and the mask value" is equal to "the logical product of each bit of the network number of the communication partner and the mask value" And, when "the logical product of each bit of the network number of the own device and the network number of the communication partner" is equal to the "network number of the own device", it can be determined that the other party is a valid communication partner.

  For example, when the wireless device 22A receives an RNO from the gateway wireless device 21, the logical product of each bit of “0x123451” and “0xFFFFF0” and the logical product of each bit of “0x12345F” and “0xFFFFF0” are both It is "0x123450". Also, the logical product of each bit of “0x123451” and “0x12345F” is “0x123451”, which is equal to the network number of the wireless set 22A. Thus, the wireless device 22A can determine that the gateway wireless device 21 is a valid communication counterpart.

  Further, when the wireless device 22A receives RNO from the wireless device 22B, the logical product of each bit of “0x123451” and “0xFFFFF0” and the logical product of each bit of “0x123452” and “0xFFFFF0” are “ Although the logical product of each bit of "0x123451" and "0x123452" is "0x123450" although it is "0x123450" and is different from the network number of the wireless device 22A, the wireless device 22A communicates the wireless device 22B properly. It can be judged that it is not the other party.

  In the present embodiment, when the wireless device 22 receives the RNO, “the AND of each bit of the network number of the own device and the mask value” is “the bit of the network number of the communication partner and the mask value”. Using the condition that it is equal to the logical product and the condition that the logical product of each bit of the network number of the own machine and the network number of the communication partner is equal to the network number of the own machine, In this configuration, the validity of the communication partner is determined using the condition that “the logical product of each bit of the network number of the own device and the network number of the communication partner” is equal to the “network number of the own device”. It is good also as composition which judges sex.

  As described above, in the fourth embodiment, the legitimacy of the other party of communication can be determined by the logical operation between the network numbers or the logical operation of the network numbers and a predetermined mask value.

  It should be understood that the embodiment disclosed herein is illustrative in all respects and not restrictive. The scope of the present invention is indicated not by the meaning described above but by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

  For example, in the first to fourth embodiments, each wireless device 22 is classified according to the network numbers of the short range wireless networks NA to NC, but each wireless device 22 is divided into a plurality of groups according to the attributes of each wireless device 22 , And may be configured to use a group ID for identifying a group instead of the network number.

  In the first to fourth embodiments, when the gateway radio 21 or the radios 22A to 22C receives the RNO, it is determined whether the transmission source of the RNO is a valid communication counterpart or not. When a request transmitted as a response to the RNO is received, it may be determined whether the transmission source of the request is a valid communication counterpart.

  The following appendices will be further disclosed regarding the above embodiment.

  The wireless telemetry system of the present application can wirelessly communicate with the plurality of first radios (22) to which the meter (23) is connected, and the first radio (22) via the wireless networks (NA to NC) And a second radio (21) capable of communicating with a communication device (10) connected to a communication network (N) different from the wireless network (NA to NC). A determination unit (220) that determines whether the first wireless device (22) can receive a signal transmitted from the second wireless device (21) or another first wireless device (22); If it is determined that the wireless device can be received, the wireless device ID, which is the identifier of the own device, and the identifier of the group to which the own device belongs, out of a plurality of groups that classify the respective first wireless devices (22) Intermittent transmission of ID notification signal including group ID And the second wireless device (21) includes a wireless device ID of each first wireless device (22) and a meter (23) connected to the first wireless device (22). A storage unit (211) for storing at least one of a meter ID which is an identifier and a group ID of a group to which the first wireless device (22) belongs, and a first wireless device (22) or a meter (23) When a signal from the communication device (10) as a destination is received through the communication network (N), the association of each ID stored in the storage unit (211) is referred to, and the received signal is transferred to be transferred The determination unit (210) for determining the previous group, the reception unit (213) for receiving the ID notification signal transmitted from the transmission unit (222), and the group ID included in the received ID notification signal Part (210 A communication connection unit (210) for establishing communication connection with the first radio (22) of the transmission source of the ID notification signal when the group ID corresponds to the group ID of the determined group; And a transfer unit (213) for transferring a signal from the communication device (10) to the device (22).

  In the present application, when the second radio receives a signal addressed to a meter transmitted from an external communication device, distribution of transmission destinations is performed according to the group of first radios to which the destination meter is connected. Thus, wireless communication between wireless devices belonging to different groups can be avoided. That is, in the present application, since the transmission and reception of signals can be performed after judging the legitimacy of the communication path, it is possible to clarify the operation responsibility of the operator who manages the wireless device connected to each wireless network.

  In the wireless telemetry system of the present application, the second wireless device (21) is capable of receiving a determination unit (210) that determines whether or not the signal transmitted from each first wireless device (22) can be received. When it is determined that the ID notification signal including the wireless device ID which is the identifier of the second wireless device (21) and any one group ID is intermittently changed by sequentially changing the group ID A transmitter (213), each of the first radios (22) receiving unit for receiving an ID notification signal transmitted from the second radio (21) or another first radio (22); 222) and data to be transmitted to the communication device (10), and the group ID included in the ID notification signal received from the second wireless device (21) corresponds to the group ID of the own device Establishing a communication connection with the second radio (21) Communication connection unit and a (220) that, and transmits a signal including the data to the was establishing a communication connection the second radio (21).

  In the present application, one second radio can be shared among the first radios belonging to a plurality of radio networks by sequentially transmitting a plurality of types of RNOs having different group IDs from the second radio. Further, in the present application, since one second wireless device emulates a plurality of second wireless devices, the second wireless device belongs to a plurality of wireless networks without adding a new function to the first wireless device. Communication with one radio can be supported by one second radio.

  In the wireless telemetry system of the present application, the second wireless device (21) has a unique group ID assigned to the second wireless device (21), and a signal transmitted from each first wireless device (22) A determination unit (210) for determining whether or not reception is possible, and if it is determined that reception is possible, a wireless unit ID that is an identifier of the second wireless unit (21), and the unique group ID, And a transmitter (213) for intermittently transmitting an ID notification signal including the first radio (22), the first radio (22) storing the unique group ID, and the second radio (21) A receiver (222) for receiving an ID notification signal transmitted from the first wireless device (22) or the other, and the received ID having data to be transmitted to the communication device (10) The group ID included in the notification signal is the unique group When it corresponds to D, it includes a communication connection unit (220) for establishing communication connection with the second radio (21), and a signal including the data to the second radio (21) for establishing communication connection. To send.

  In the present application, the second wireless device has a unique group ID, and the first wireless device and the second wireless device store the group IDs of each other, so that the plurality of first wireless devices belonging to the plurality of wireless networks One second radio can be shared.

  In the wireless telemetry system of the present application, the second wireless device (21) includes a plurality of bits as an identifier of a group to which the second wireless device (21) belongs, and a bit in a specific range of the plurality of bits A determination unit (210) that has a group ID set to all 1 and determines whether the signal transmitted from each first wireless device (22) can be received, and it is determined that the reception is possible In this case, each of the first wireless devices (22) is provided with a transmitting unit (213) for intermittently transmitting an ID notification signal including a wireless device ID that is an identifier of the second wireless device (21) and the group ID. A group having the same number of bits as the group ID of the second wireless device (21) as an identifier of its own group, and a group in which any one bit is set to 1 among the bits in the same range as the specific range Have an ID, (2) A receiver (222) for receiving an ID notification signal transmitted from the second radio (21) or the other first radio (22), having data to be transmitted, and included in the received ID notification signal A communication connection unit (222) which establishes communication connection with the transmission source of the ID notification signal when the logical product of each bit of the group ID to be transmitted and each bit of the group ID of the own group matches the group ID of the own group. And transmitting a signal including the data to a transmission source of the ID notification signal which has established a communication connection.

  In the present application, the legitimacy of the other party of communication can be determined by the logical operation between the group IDs.

  In the wireless telemetry system of the present application, the communication connection unit (220, 210) of the first wireless device (22) and the second wireless device (21) has data to be transmitted, and the received ID notification signal If the logical product of each bit of the contained group ID and each bit of the predetermined mask value is equal to the logical product of each bit of the group ID of its own group and each bit of the mask value, the ID notification A communication connection is established with a signal transmission source.

  In the present application, the legitimacy of the other party of communication can be determined by a logical operation between the group ID and a predetermined mask value.

  The communication apparatus according to the present application is capable of wireless communication via a plurality of wireless devices (22) to which a meter (23) is connected and wireless networks (NA to NC), and the wireless networks (NA to NC) In a communication device (21) capable of communicating with an external device (10) connected to a different communication network (N), connect to a wireless device ID that is an identifier of each wireless device (22) and each wireless device (22) A storage unit (211) that associates and stores at least one of the meter IDs, which are identifiers of the selected meters (23), and the group ID of the group to which each wireless device (22) belongs, and one wireless device (22) or When the signal transmitted from the external device (10) is received with the meter (23) as the destination, the association of each ID stored in the storage unit (211) is referred to, and the transfer destination to which the received signal should be transferred Determine the group of A determination unit (210), a reception unit (213) for receiving an ID notification signal including a wireless device ID and a group ID, and a group in which a group ID included in the received ID notification signal is determined by the determination unit (210) And a communication connection unit (210) for establishing communication connection with the transmission source of the ID notification signal, and transferring the signal from the external device (10) to the transmission source for which communication connection has been established. And a transfer unit (213).

  In the present application, when the second radio receives a signal addressed to a meter transmitted from an external communication device, distribution of transmission destinations is performed according to the group of first radios to which the destination meter is connected. Thus, wireless communication between wireless devices belonging to different groups can be avoided.

10 centers 20 NCU
21 gateway radio 22A to 22C radio 23A to 23C meter 200, 220, 220 control unit 201, 211, 221 storage unit 202 wide area wireless communication unit 203, 212 connection unit 204, 214, 224 display unit 205, 215, 225 operation Part 213, 222 Short range wireless communication part 223 Connection port 229 battery

Claims (6)

A plurality of first radios to which a meter is connected, and a communication device capable of wireless communication with the first radio via a wireless network and connected to a communication network different from the wireless network In a wireless telemetry system comprising a possible second radio
Each first radio is
A determination unit that determines whether the signal transmitted from the second radio or the other first radio can be received;
If it is determined that the wireless device can be received, the wireless device ID that is the identifier of the own device, and the group ID that is the identifier of the group to which the own device belongs among a plurality of groups that classify the respective first wireless devices A transmitter for intermittently transmitting an ID notification signal including
The second radio is
A storage unit that associates and stores at least one of a wireless device ID of each first wireless device and a meter ID that is an identifier of a meter connected to the first wireless device with a group ID of a group to which the first wireless device belongs When,
When a signal from the communication device addressed to a first radio or a meter is received through the communication network, the association of each ID stored in the storage unit is referred to, and the transfer destination to which the received signal should be transferred A determination unit that determines a group;
A receiving unit that receives the ID notification signal transmitted from the transmitting unit;
A communication connection unit that establishes a communication connection with a first wireless device that is a transmission source of the ID notification signal when the group ID included in the received ID notification signal corresponds to the group ID of the group determined by the determination unit;
A wireless telemetry system, comprising: a transfer unit configured to transfer a signal from the communication device to a first wireless device that has established a communication connection. The second radio is
A determination unit that determines whether or not the signal transmitted from each first radio can be received;
When it is determined that reception is possible, transmission is performed by intermittently changing the group ID by sequentially changing an ID notification signal including a wireless device ID that is an identifier of the second wireless device and any one group ID Equipped with
Each first radio is
A receiver for receiving an ID notification signal transmitted from the second radio or the other first radio;
If there is data to be transmitted to the communication device, and the group ID included in the ID notification signal received from the second wireless device corresponds to the group ID of the own device, the communication connection with the second wireless device is made. And a communication connection to establish
The wireless telemetry system according to claim 1, wherein a signal including the data is transmitted to the second wireless device which has established a communication connection. The second radio is
Have a unique group ID assigned to the second radio,
A determination unit that determines whether or not the signal transmitted from each first radio can be received;
A transmitter configured to intermittently transmit an ID notification signal including a wireless device ID, which is an identifier of the second wireless device, and the unique group ID when it is determined that reception is possible;
Each first radio is
A storage unit that stores the unique group ID;
A receiver for receiving an ID notification signal transmitted from the second radio or the other first radio;
A communication connection unit for establishing a communication connection with the second wireless device, when there is data to be transmitted to the communication device, and a group ID included in the received ID notification signal corresponds to the unique group ID; Equipped with
The wireless telemetry system according to claim 1, wherein a signal including the data is transmitted to the second wireless device which has established a communication connection. The second radio is
As an identifier of a group to which the second wireless device belongs, it has a group ID which is composed of a plurality of bits and in which bits in a specific range of the plurality of bits are all set to 1,
A determination unit that determines whether or not the signal transmitted from each first radio can be received;
A transmitter configured to intermittently transmit an ID notification signal including a wireless device ID, which is an identifier of the second wireless device, and the group ID, when it is determined that reception is possible;
Each first radio is
As an identifier of the own group, the group ID has the same number of bits as the group ID of the second wireless device, and has a group ID in which any one bit of bits in the same range as the specific range is set to 1.
A receiver for receiving an ID notification signal transmitted from the second radio or the other first radio;
In the case where the logical product of each bit of the group ID included in the received ID notification signal and each bit of the group ID of the own group matches the group ID of the own group. A communication connection unit for establishing communication connection with a transmission source of an ID notification signal;
The wireless telemetry system according to claim 1, wherein a signal including the data is transmitted to a transmission source of the ID notification signal in which a communication connection is established. The communication connection unit of the first radio and the second radio is:
The logical product of each bit of the group ID included in the received ID notification signal, having data to be transmitted, and each bit of a predetermined mask value, corresponds to each bit of the group ID of its own group, 5. The wireless telemetry system according to claim 4, wherein the communication connection is established with the transmission source of the ID notification signal when it is equal to the logical product of the mask value and each bit. A communication device capable of wireless communication via a wireless network with a plurality of wireless devices to which a meter is connected and capable of communicating with an external device connected to a communication network different from the wireless network.
A storage unit that associates and stores at least one of a wireless device ID that is an identifier of each wireless device and a meter ID that is an identifier of a meter connected to each wireless device with a group ID of a group to which each wireless device belongs;
When a signal transmitted from the external device is received with the destination of one radio or meter, the association of each ID stored in the storage unit is referenced to determine the transfer destination group to which the received signal should be transferred. The discrimination unit to
A receiver for receiving an ID notification signal including a wireless device ID and a group ID;
A communication connection unit for establishing communication connection with a transmission source of the ID notification signal when the group ID included in the received ID notification signal corresponds to the group ID of the group determined by the determination unit;
A transfer unit configured to transfer a signal from the external device to the transmission source that has established a communication connection.

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