JP6563785B2 - Radio and radio telemeter system - Google Patents

Description

  The present invention relates to a wireless device and a wireless telemeter system that transmit a usage amount of gas, water, electricity, and the like measured by a meter to a communication device on 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 an NCU (Network Control Unit), a gateway wireless device, a wireless device, and the like as a configuration on the terminal side. The host computer on the center side and the terminal side and the gateway radio are communicably connected via a wide area communication network such as a public telephone network, a PHS (Personal Handyphone System) network, and a FOMA (Freedom Of Mobile multimedia Access) network. Further, the terminal-side gateway radio and each radio form a narrow-area radio network and are communicably connected to each other.

  Each radio is connected to a meter that measures the amount of supply such as gas, water, and electricity supplied to each consumer. When each meter acquires a measurement result (meter reading value), it transmits a packet including the acquired meter reading value. The packet transmitted from each meter reaches the host computer on the center side via one or more radios including the radio connected to the meter, the gateway radio, and the NCU.

JP 2005-142909 A

  In a conventional radio telemeter system, in order to determine a communication path from a source radio to a destination radio, an identifier (radio number) of each radio and a hop to each radio The number of hops stored in association with the number is exchanged. The data length of packets transmitted and received between radios when exchanging the hop count table is determined by the communication standard of the narrow-band radio network, so when the hop count of each radio is stored by radio number Has a problem that it is not possible to notify a sufficient number of radio device numbers and hop counts in one packet.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a radio and a radio telemeter system that can increase the number of radios that can notify the radio number and the number of hops in one packet. And

  The wireless device of the present application is communicable with other wireless devices via a wireless network, and in a wireless device provided with an identifier for identifying each of the wireless devices in the wireless network, a plurality of wireless devices including its own identifier A hop number table that associates and stores an identifier and the number of hops from the own device to each wireless device identified by the identifier, and the number of hops is N (N is an integer of 1 or more) based on the hop number table By distinguishing the identifier group of each radio device and the identifier group of each radio device having the number of hops of N + 1 using a delimiter indicating the boundary between both identifier groups, a packet storing the identifier of each radio device by the number of hops is obtained. A generation unit for generating and a transmission unit for transmitting the packet generated by the generation unit to the other radio device are provided.

  In the wireless device of the present application, the generating unit can generate a packet storing the number of hops of each wireless device for each identifier, and the transmitting unit has a number of wireless devices whose identifiers are stored in the hop number table. If the threshold is greater than or equal to a preset threshold, a packet storing the identifier of each radio is stored for each number of hops. If the threshold is less than the threshold, a packet storing the number of hops of each radio is stored for each identifier. It is characterized by.

  The wireless device of the present application includes a receiving unit that receives a packet storing the number of hops of each wireless device for each identifier from another wireless device, and the generation unit receives each packet when the receiving unit receives the packet. Instead of generating a packet in which the identifier of each radio is stored for each number of hops, a packet is generated in which the number of hops of each radio is stored for each identifier.

  In the wireless device of the present application, the packet transmitted by the transmitting unit includes information for distinguishing between a packet storing the identifier of each wireless device for each hop number and a packet storing the hop number of each wireless device for each identifier. It is characterized by that.

  A radio telemeter system according to the present application includes a plurality of radio devices to which identifiers for identifying each of them in a radio network are provided, and at least one of the plurality of radio devices includes a connection unit for connecting a meter. , Each wireless device has a hop number table for storing the identifier of each wireless device in association with the number of hops to each wireless device identified by the identifier, and the hop number is N ( N is an integer equal to or greater than 1), and the identifier group of each radio device having the number of hops of N + 1 is distinguished using a delimiter that represents the boundary between the two identifier groups. And a transmission unit that transmits the packet generated by the generation unit to the other radio device.

  According to the present application, it is possible to increase the number of wireless devices that can notify the wireless device number and the number of hops in one packet.

1 is a block diagram showing an overall configuration of a radio telemeter system according to Embodiment 1. FIG. It is a block diagram which shows the internal structure of a radio | wireless machine. It is a schematic diagram which shows the connection relation of each radio | wireless machine. It is a conceptual diagram which shows an example of a hop number table. 6 is a schematic diagram illustrating an example of a packet generated when the wireless device according to Embodiment 1 exchanges a hop number table. FIG. It is a schematic diagram which shows the structural example of the conventional packet shown as a comparative example. 6 is a flowchart illustrating a procedure of processing executed by the wireless device according to the second embodiment. It is a schematic diagram which shows the structural example of the packet transmitted when notifying the information of a hop number table. 14 is a flowchart illustrating a procedure of processing executed by the wireless device according to the third embodiment.

Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof.
(Embodiment 1)
FIG. 1 is a block diagram showing the overall configuration of the radio telemeter system according to the first embodiment. The radio telemeter system according to the present embodiment includes an NCU 20, a gateway radio 21, a plurality of radios 22A to 22F, and meters 23, 23,. The meter 23 is a measuring instrument that is installed for each consumer such as a private house, a company, various facilities, and the like, measures the amount of gas, water, electricity, etc., and outputs the measurement result (meter reading value). In the wireless telemeter system, various data output from the terminal side such as data indicating meter reading values of the meters 23, 23,... , And various data including control commands for controlling the operations of the radio devices 22A to 22F and the meters 23, 23,... 23 are transmitted from the center 10 to the terminal side.

  The center 10 includes, for example, a communication device that communicates with the terminal side via a wide area wireless network N1 such as a PHS network or a FOMA network, and a storage device that accumulates data transmitted from the terminal side (not shown).

  The NCU 20 is connected to the wide area wireless network N1 and performs wireless communication with the center 10 via the wide area wireless network N1. Note that communication between the NCU 20 and the center 10 is not limited to wireless communication, but 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 20 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.

  The gateway radio 21 is configured to be able to communicate with the radios 22A to 22F by participating in a narrow area wireless network N2 including the radios 22A to 22F. Note that the gateway wireless device 21 and the wireless devices 22A to 22F belonging to the narrow-area wireless network N2 are issued by number issuing wireless devices not shown in the figure as identifiers for identifying each within the narrow-area wireless network N2. It shall have a radio number. The gateway wireless device 21 and the wireless devices 22A to 22F perform wireless communication with the communication partner designated by the wireless device number.

  When receiving a packet including a meter reading value from the meter 23 connected to each of the wireless devices 22A to 22F through the bus line, the wireless devices 22A to 22F transmit the packets to the gateway wireless device 21 via the narrow area wireless network N2. At this time, packets transmitted from the wireless devices 22A to 22F reach the gateway wireless device 21 directly or via one or more other wireless devices 22A to 22F. The gateway radio 21 receives the packet transmitted from the radios 22A to 22F through the narrow-area radio network N2, and when the event to be notified to the center 10 occurs in the own machine, the gateway radio 21 communicates with the center 10 through the NCU 20. And a desired packet is transmitted to the center 10.

  In the following description, when it is not necessary to distinguish between the radio devices 22A to 22F, the radio devices 22 are also described. In the example of FIG. 1, the configuration in which the six radio devices 22A to 22F are connected in the narrow area wireless network N2 has been described, but the number of the radio devices 22 that can be connected in the narrow area wireless network N2 is limited to six. However, it may be changed as appropriate within the range of the maximum number of connections determined by the communication standard of the narrow area wireless network N2.

  FIG. 2 is a block diagram showing the internal configuration of the radio device 22. The wireless device 22 includes a control unit 220, a storage unit 221, a narrow-area wireless communication unit 222, a connection port 223, a display unit 224, an operation unit 225, and the like. Each hardware unit included in the wireless device 22 is configured to operate with electric power supplied from the battery 229.

  The control unit 220 includes, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), and the like. The CPU in the control unit 220 executes the control program stored in advance in the ROM, thereby causing the entire device to function as the wireless device according to the present invention. The control unit 220 may include functions such as a clock unit that outputs date and time information, a timer that measures an elapsed time from when a measurement start instruction is given to when a measurement end instruction is given, and a counter that counts the number. .

  The storage unit 221 is configured by a non-volatile memory such as an EEPROM (Electronically Erasable Programmable Read Only Memory), for example, and is issued from setting information regarding various operations, a radio ID that is an identifier unique to the own machine, and a number issuing radio. Stored radio number and the like. The storage unit 221 includes various tables that are referred to during communication. In the table provided in the storage unit 221, for example, a hop number table that stores the wireless device numbers of a plurality of wireless devices 22 including the wireless device number of the own device and the number of hops from the own device to each wireless device 22 in association with each other. Is included.

  The narrow area wireless communication unit 222 transmits or receives radio waves through the antenna 222a, thereby performing wireless communication with the gateway wireless device 21 and the other wireless devices 22, 22,. Do. As the wireless communication method, for example, a communication method compliant with the U bus air standard is adopted. If the local 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 narrow-area wireless communication unit 222 sets the RNO (the wireless device number of the own device). Transmit intermittently. In addition, when the narrow-area wireless communication unit 222 receives an RNO transmitted from the gateway wireless device 21 or another wireless device 22 and has a packet to be transmitted, the narrow-area wireless communication unit 222 transmits the RNO to the packet. Send to the original.

  The connection port 223 includes an interface for connecting the meter 23 for measuring the usage amount of gas, water, electricity and the like. The wireless device 22 transmits and receives packets to and from the meter 23 connected to the connection port 223 via a bus line such as a U bus.

  The display unit 224 includes an LED lamp (LED: Light Emitting Diode), a liquid crystal display panel, and the like, and performs installation work and maintenance work of the wireless device 22 based on a control signal output from the control unit 220. Information to be notified to the staff etc. is displayed.

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

Hereinafter, the operation of radio apparatus 22 according to Embodiment 1 will be described.
FIG. 3 is a schematic diagram showing a connection relationship between the wireless devices 22. The example of FIG. 3 simply shows a connection relationship between the six radio devices 22A to 22F in the narrow area wireless network N2, and a communication path capable of direct wireless communication is indicated by a broken line. In addition, it is assumed that radio numbers “1” to “6” are assigned to the radio devices 22A to 22F, respectively.

  For example, as a communication route from the wireless device 22B with the wireless device number “2” to the wireless device 22F with the wireless device number “6”, the communication route via the wireless device 22A and the wireless device 22C, the wireless device 22D and the wireless device 22C. And a communication path that passes through the wireless device 22E, the wireless device 22D, and the wireless device 22C.

  In general, a communication route that minimizes the number of hops to reach the destination is preferentially selected, but a bypass route may be selected depending on the communication status. For example, in the communication route from the wireless device 22B with the wireless device number "2" to the wireless device 22F with the wireless device number "6", the communication route via the wireless device 22A and the wireless device 22C, and the wireless device 22D and the wireless device The number of hops is 3 in both of the communication paths passing through 22C, and the number of hops is 4 in the communication paths passing through the wireless device 22E, the wireless device 22D, and the wireless device 22C. Selected. However, if the communication status between the radio device 22B and the radio devices 22A and 22D is not good, a communication path with a hop count of 4 via the radio device 22E may be selected.

  Each wireless device 22 exchanges the hop number table with the adjacent wireless device at an appropriate timing (for example, a timing when a new wireless device 22 is connected to the narrow area wireless network N2), and the hop number table of its own device. Is updated, the wireless device number of each wireless device 22 connected in the narrow area wireless network N2 and the number of hops from the own device to each wireless device 22 are grasped. Each wireless device 22 can determine a communication path from its own device to the destination by referring to the hop count table updated as appropriate.

  FIG. 4 is a conceptual diagram showing an example of the hop number table. The hop count table is a table that stores the radio number of each radio 22 connected to the narrow-area radio network N2 in association with the number of hops up to the radio 22 identified by the radio number. . Note that the hop number of the wireless device 22 itself including the hop number table is 0, and the hop number of an adjacent wireless device that can directly perform wireless communication with the wireless device 22 is defined as 1. The number of hops increases by one as the number of wireless devices 22 further passing from the adjacent wireless device increases by one.

  FIG. 4 shows an example of the hop number table provided in the wireless device 22B with the wireless device number “2”. Since the number of hops of the wireless device 22B itself is 0, the wireless device number “2” and the hop number 0 are associated and registered in the hop number table. Further, according to the connection relationship shown in FIG. 3, since the adjacent wireless devices of the wireless device 22B are the wireless devices 22A, 22D, and 22E, these wireless device numbers “1”, “4”, and “5” are respectively set. It is associated with hop number 1 and registered in the hop number table. Similarly, for the wireless device 22C having 2 hops from the wireless device 22B, the wireless device number “3” and the hop number 2 are associated and registered in the hop number table, and the hop number from the wireless device 22B is For the wireless device 22F that is 3, the wireless device number “6” and the hop number 3 are associated and registered in the hop number table.

  Each wireless device 22 exchanges the hop number table with an adjacent wireless device at an appropriate timing such as a timing when a new wireless device 22 is connected to the narrow-area wireless network N2. At this time, the control unit 220 of each wireless device 22 generates a packet in a predetermined format in order to notify the information registered in its own hop number table to the adjacent wireless device.

  FIG. 5 is a schematic diagram illustrating an example of a packet generated when the wireless device 22 according to the first embodiment exchanges the hop number table. FIG. 5 shows a part of a packet generated when the wireless device 22B with the wireless device number “2” exchanges the hop number table. When each radio device 22 (radio device 22B in the example of FIG. 5) exchanges a hop number table with an adjacent radio device, each radio device 22 having the hop number N (N is an integer of 1 or more) from its own device. By separating the radio number group and the radio number group of each radio device 22 with the number of hops of N + 1 from each other by dividing the boundary between the two radio device number groups with a delimiter, the radio devices of each radio device 22 including its own device Generate a packet that stores the number by hop count.

  In the example of the packet illustrated in FIG. 5, first, the wireless device number “2” of the wireless device 22B of the transmission source (hop number 0) is stored, and the wireless device 22 having the hop number 1 from the transmission source without sandwiching the delimiter. Stores a radio number group of (adjacent radio). In the connection example of FIG. 3, since the adjacent radios of the radio 22B are the radios 22A, 22D, and 22E, the radio numbers “1”, “4”, and “5” of these radios 22A, 22D, and 22E. Is stored.

  Following the radio number group of hop number 1, a radio number group of hop number 2 is stored with a delimiter in between. In the connection example of FIG. 3, since the wireless device 22 having the hop number 2 from the wireless device 22B is only the wireless device 22C, the wireless device number “3” of the wireless device 22C is stored with a delimiter interposed therebetween. As the delimiter, any character string that is not scheduled to be assigned as a radio number can be adopted. In the present embodiment, “FF” is adopted as an example of a delimiter.

  Similarly, a radio number group with 3 hops is stored across a delimiter after a radio number group with 2 hops. In the connection example of FIG. 3, since the wireless device 22 having the hop number 3 from the wireless device 22B is only the wireless device 22F, the wireless device number “6” of the wireless device 22F is stored with a delimiter interposed therebetween.

  When each wireless device 22 receives a packet configured as described above, each wireless device 22 can determine the first wireless device number included in the data portion of the packet as the wireless device number of the transmission source wireless device. Further, each radio device 22 uses one or more radio device numbers stored until the first delimiter is detected from the radio device number of the transmission source radio device, as a wireless device with a hop number of 1 from the transmission source radio device. 1 or a plurality of radio numbers stored between the Nth delimiter (N is an integer equal to or greater than 1) and the (N + 1) th delimiter can be transmitted. It can be determined that the wireless device number of the wireless device 22 with the hop number N from the original wireless device.

  Hereinafter, as a comparison, a configuration example of a packet transmitted when each wireless device exchanges a hop number table in a conventional wireless device telemeter system will be described.

  FIG. 6 is a schematic diagram showing a configuration example of a conventional packet shown as a comparative example. In a conventional radio telemeter system, the radio number of each radio is paired with the number of hops from the transmission source radio, and the number of hops of each radio is stored for each radio number (hereinafter referred to as conventional format). Was adopted. For example, when the wireless device 22B connected as shown in FIG. 3 transmits data in the hop number table according to the conventional format, the wireless device 22B transmits the wireless device number “1” and the hop number (= 1) of the wireless device 22A. , The radio number “2” and the number of hops (= 0) of the radio 22B, the radio number “3” and the number of hops (= 2) of the radio 22C, the radio number “4” and the number of hops of the radio 22D (= 1), a packet including the wireless device number “5” of the wireless device 22E and the number of hops (= 1), the wireless device number “6” of the wireless device 22F and the number of hops (= 3) in order.

  In the U-bus air standard, which is one of the communication standards for the narrowband wireless network N2, the data length of the hop number table that can be used in the frame format of the network layer is limited to 104 bytes. When adopting the conventional format that stores the number of hops of each radio by radio number, assuming that the radio number and the number of hops are 1 byte each, 2 bytes of data is required for each radio. But it is limited to 52 units. Although it is possible to increase the number of communications by increasing the number of communications, the increase in the number of communications will shorten the battery life of each wireless device.

  On the other hand, in the frame format (hereinafter referred to as a compression format) of the present application that stores the radio number of each radio 22 by the number of hops, for example, the maximum number of hops is 10 hops and the data length of the delimiter is 1 byte Since 9 delimiter data (= 9 bytes) and the number of radios × 1 byte are required, the number of radios can be increased to 95 (= 104−9).

  As described above, the first embodiment employs a compression format that stores the wireless device number of each wireless device 22 according to the number of hops. Therefore, when transmitting the data of the hop number table without increasing the number of communication, The number of wireless devices 22 that can be notified by one packet can be increased.

  In the present embodiment, the configuration in which the hop count table is exchanged between the radios 22 and 22 has been described. However, since the gateway radio 21 functions as one radio in the narrow area wireless network N2, the gateway radio Of course, the hop number table may be exchanged between the device 21 and the wireless device 22.

(Embodiment 2)
In the second embodiment, a configuration in which a compressed format and a conventional format are switched and used will be described.

  Each wireless device 22 according to the second embodiment, when exchanging the hop number table, if the number of wireless devices 22 connected in the narrow area wireless network N2 is less than a threshold (for example, less than 50), the conventional format A packet is generated at, and if the number of wireless devices 22 connected in the narrow area wireless network N2 is equal to or greater than a threshold value, the packet is generated in a compressed format.

  FIG. 7 is a flowchart illustrating a procedure of processing executed by the radio device 22 according to the second embodiment. The control unit 220 of the wireless device 22 determines whether or not to exchange the hop number table (step S201). When each radio device 22 exchanges a hop number table with an adjacent radio device and updates its own hop number table stored in the storage unit 221, a value of a hop number table update counter (not shown) is set to 1. Only increase. Each wireless device 22 has a value of the hop number table update counter held by the wireless device number (RNO) from the adjacent wireless device, for example, and a hop number table update counter held by the adjacent wireless device. If the hop number table is not the latest one, the hop number table is exchanged with the adjacent wireless device. When the hop number table is not exchanged (S201: NO), the control unit 220 ends the process according to this flowchart without executing the following process.

  When exchanging the hop number table (S201: YES), the control unit 220 refers to the hop number table stored in the storage unit 221 and determines the number of radio devices 22 connected in the narrow area wireless network N2. It is determined whether or not it is a threshold value (for example, 50) or more (step S202).

  If it is determined that the value is equal to or greater than the threshold (S202: YES), the control unit 220 adopts a compression format that stores the wireless device number of each wireless device 22 by the number of hops, and sends a packet for notifying the hop number table. Generate (step S203).

  When it is determined that the number is less than the threshold (S202: NO), the control unit 220 adopts a conventional format that stores the number of hops of each wireless device 22 by wireless device number, and sends a packet for notifying the hop number table. Generate (step S204).

  Next, the control unit 220 transmits the packet generated in step S203 or S204 from the narrowband wireless communication unit 222 and receives the packet including the data of the hop number table transmitted from the adjacent wireless device. The hop number table is exchanged (step S205).

  The control unit 220 reconstructs the hop number table from the packets transmitted from the adjacent wireless devices, and updates the hop number table in the storage unit 221 (step S206). When the hop number table is updated, the control unit 220 increases the value of the hop number table update counter by 1.

  In addition, information for distinguishing between a packet generated in the compressed format and a packet generated in the conventional format may be added to the packet transmitted to notify the information of the hop number table.

  FIG. 8 is a schematic diagram showing a configuration example of a packet to be transmitted when notifying information of the hop number table. The network layer frame format used in the exchange of the hop number table includes a 1-byte network control command (N-Con), 6-byte network control command information (N-Conf-inf), and 106-byte data to be transmitted ( NET data).

  In order to indicate the compressed format, for example, a dedicated command may be assigned to the network control command separately from the command (30h) representing the normal hop number table.

  The network control command information includes a packet exchange target radio number (OBJ-No), a hop number table update counter (CONF-Cntr), and a reserved area, so information indicating that the compressed format is added to the reserved area. May be.

  As described above, in the second embodiment, a packet for notifying the information of the hop number table is basically generated by adopting the conventional format, and the wireless device 22 connected in the narrow area wireless network N2 is used. Only when the number is equal to or greater than the threshold value, a packet can be generated using the compression format.

(Embodiment 3)
In the third embodiment, a description will be given of a configuration for switching to a conventional format when a packet in a conventional format is received from an adjacent wireless device, while generating a packet in a compressed format when exchanging hop count tables.

  FIG. 9 is a flowchart illustrating a procedure of processing executed by the wireless device 22 according to the third embodiment. The control unit 220 of the wireless device 22 determines whether or not to exchange the hop number table (step S301). For example, each wireless device 22 compares the value of the hop number table update counter held by its own device with the value of the hop number table update counter held by the adjacent wireless device, and the hop number table is the latest. If not, the hop number table is exchanged with the adjacent wireless device. When the hop number table is not exchanged (S301: NO), the control unit 220 ends the process according to this flowchart without executing the following process.

  When exchanging the hop count table (S301: YES), the control unit 220 determines whether or not a packet in the conventional format has been received from an adjacent wireless device in the past (step S302).

  When it is determined that a packet of the conventional format has been received in the past (S302: YES), the control unit 220 adopts a conventional format that stores the number of hops of each wireless device 22 by wireless device number, and the number of hops. A packet for notifying the table is generated (step S303).

  When it is determined that a packet of the conventional format has not been received in the past (S302: NO), the control unit 220 adopts a compression format that stores the wireless device number of each wireless device 22 according to the number of hops, and the number of hops. A packet for notifying the table is generated (step S304).

  Next, the control unit 220 transmits the packet generated in step S303 or S304 from the narrowband wireless communication unit 222 and receives a packet including data of the hop number table transmitted from the adjacent wireless device. The hop number table is exchanged (step S305).

  The control unit 220 reconstructs the hop number table from the packets transmitted from the adjacent wireless devices, and updates the hop number table in the storage unit 221 (step S306). When the hop number table is updated, the control unit 220 increases the value of the hop number table update counter by 1.

  Note that, in the same manner as in the second embodiment, information for distinguishing between a packet generated in the compressed format and a packet generated in the conventional format is added to the packet transmitted to notify the information of the hop number table. May be.

  As described above, in the third embodiment, basically, a compression format is adopted to generate a packet for notifying information of the hop number table, and only when a packet in a conventional format is received from an adjacent radio. The packet can be generated using the conventional format.

  The embodiment disclosed this time is to be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the meanings described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  Regarding the above embodiment, the following additional notes are disclosed.

  The wireless device of the present application is communicable with another wireless device (22) via the wireless network (N2), and in the wireless device to which an identifier for identifying each wireless device (N2) is assigned, A hop number table for storing the identifiers of a plurality of wireless devices (22) including the identifiers of the wireless devices and the number of hops from the own device to each wireless device (22) identified by the identifiers; On the basis of the identifier group of each radio device (22) having N hops (N is an integer equal to or greater than 1) and the identifier group of each radio device (22) having N + 1 hops, a delimiter representing a boundary between both identifier groups. To generate a packet storing the identifier of each radio device (22) according to the number of hops, and a packet generated by the generation unit (220) to the other radio device (220). 22) transmitting unit (2) Characterized in that it comprises a 2) and.

  In this application, since the format for storing the identifier of each radio device by the number of hops is adopted, the identifier and the number of hops of the radio device are determined by one packet compared to the conventional format in which the number of hops is stored by the identifier of the radio device. The number of radios that can be notified can be increased.

  In the wireless device of the present application, the generating unit (220) can generate a packet storing the number of hops of each wireless device (22) by identifier, and the transmitting unit (222) has an identifier in the hop number table. When the number of stored radios (22) is equal to or greater than a preset threshold, a packet storing the identifier of each radio (22) by number of hops is transmitted. When the number is less than the threshold, A packet in which the number of hops of the wireless device (22) is stored for each identifier is transmitted.

  In this application, basically, the number of radios connected in the narrow area wireless network is generated by using a format in which the number of hops is stored for each radio identifier, and generating a packet for notifying information of the hop number table. The packet can be generated by adopting a format in which the identifier of the wireless device is stored for each number of hops only when is equal to or greater than the threshold.

  The wireless device of the present application includes a receiving unit (222) that receives a packet storing the number of hops of each wireless device (22) for each identifier from another wireless device (22), and the generating unit (220) When the unit (222) receives the packet, it generates a packet storing the number of hops of each wireless device (22) by identifier instead of generating a packet storing the identifier of each wireless device (22) by number of hops. It is characterized by doing.

  In this application, basically, a packet for notifying the information of the hop number table is generated by adopting a format in which the identifier of the radio is stored according to the number of hops of the radio, and the number of hops is stored from the adjacent radio by the identifier. Only when a packet having the format described above is received, a packet storing a hop count for each identifier can be adopted to generate a packet.

  In the wireless device of the present application, the packet transmitted by the transmitting unit (222) includes a packet in which the identifier of each wireless device (22) is stored according to the number of hops, and a packet in which the number of hops of each wireless device (22) is stored according to the identifier. And information for distinguishing between the two.

  In this application, based on the information embedded in the packet, it is possible to distinguish between the format that stores the identifier of the radio by the number of hops and the format that stores the number of hops by the identifier of the radio, and use both together Even in this case, the hop number table can be accurately reconfigured.

  The wireless telemeter system of the present application includes a plurality of wireless devices (22) to which identifiers for identifying each of them in the wireless network (N2) are provided, and at least one of the plurality of wireless devices (22) includes a meter (23 In the wireless telemeter system including the connection unit (223) for connecting the wireless devices), each wireless device (22) has an identifier of each wireless device (22) and a hop to each wireless device (22) identified by the identifier. Hop count table that stores the number in association with each other, and based on the hop count table, the identifier group of each radio device (22) with N hops (N is an integer of 1 or more) and each radio device with N + 1 hops A generator (220) that generates a packet storing the identifier of each wireless device (22) according to the number of hops by dividing the identifier group of (22) using a delimiter that represents a boundary between the identifier groups; The raw Characterized in that it comprises transmitting section that transmits the generated packet the other radio station to (22) by parts (220) and (222).

  In this application, since the format for storing the identifier of each radio device by the number of hops is adopted, the identifier and the number of hops of the radio device are determined by one packet compared to the conventional format in which the number of hops is stored by the identifier of the radio device. The number of radios that can be notified can be increased.

10 center 20 NCU
21 Gateway Radio 22 Radio 23 Meter 220 Control Unit 221 Storage Unit 222 Narrow Area Wireless Communication Unit 223 Connection Port
224 Display unit 225 Operation unit

Claims (5)

In a wireless device that can communicate with other wireless devices via a wireless network and is given an identifier for identifying each of the wireless devices in the wireless network,
A hop number table that stores an identifier of a plurality of wireless devices including the identifier of the own device and the number of hops from the own device to each wireless device identified by the identifier,
Based on the hop number table, the identifier group of each radio device having the hop number N (N is an integer equal to or greater than 1) and the identifier group of each radio device having the hop number N + 1 are delimiters indicating the boundary between the two identifier groups. A generating unit that generates a packet that stores the identifier of each wireless device according to the number of hops,
And a transmitter that transmits the packet generated by the generator to the other wireless device. The generator is
It is possible to generate a packet that stores the number of hops of each radio by identifier,
The transmitter is
If the number of radios whose identifiers are stored in the hop number table is greater than or equal to a preset threshold, send a packet storing the identifiers of each radio by hop number, and if less than the threshold, The wireless device according to claim 1, wherein a packet storing the number of hops of each wireless device for each identifier is transmitted. A receiving unit that receives a packet storing the number of hops of each radio by identifier from another radio,
When the receiving unit receives the packet, the generating unit generates a packet storing the number of hops of each wireless device by identifier instead of generating a packet storing the identifier of each wireless device by the number of hops. The wireless device according to claim 1. The packet transmitted by the transmission unit includes information for distinguishing between a packet storing an identifier of each radio device by number of hops and a packet storing a hop number of each radio device by identifier. Item 4. The wireless device according to item 2 or item 3. In a radio telemeter system including a plurality of radio devices each having an identifier for identifying each of them in a radio network, wherein at least one of the plurality of radio devices includes a connection unit for connecting a meter,
Each radio is
A hop number table that associates and stores the identifier of each radio and the number of hops to each radio identified by the identifier;
Based on the hop number table, the identifier group of each radio device having the hop number N (N is an integer equal to or greater than 1) and the identifier group of each radio device having the hop number N + 1 are delimiters indicating the boundary between the two identifier groups. A generating unit that generates a packet that stores the identifier of each wireless device according to the number of hops,
A radio telemeter system comprising: a transmission unit that transmits the packet generated by the generation unit to the other radio device.

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