WO2017029875A1 - Multihop wireless communication system - Google Patents

Multihop wireless communication system Download PDF

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Publication number
WO2017029875A1
WO2017029875A1 PCT/JP2016/068149 JP2016068149W WO2017029875A1 WO 2017029875 A1 WO2017029875 A1 WO 2017029875A1 JP 2016068149 W JP2016068149 W JP 2016068149W WO 2017029875 A1 WO2017029875 A1 WO 2017029875A1
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WO
WIPO (PCT)
Prior art keywords
unit
repeater
signal
information
relay
Prior art date
Application number
PCT/JP2016/068149
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French (fr)
Japanese (ja)
Inventor
今村　道徳
Original Assignee
アルプス電気株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by アルプス電気株式会社 filed Critical アルプス電気株式会社
Priority to JP2017535275A priority Critical patent/JP6543713B2/en
Priority to KR1020187000567A priority patent/KR102092801B1/en
Publication of WO2017029875A1 publication Critical patent/WO2017029875A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
    • H04W4/04—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/12—Communication route or path selection, e.g. power-based or shortest path routing based on transmission quality or channel quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to a multi-hop wireless communication system that transmits data from a slave unit to a master unit via a repeater.
  • a communication method for wirelessly transmitting information from a certain wireless device slave unit (slave unit) to a base station (base unit) is a communication method (non-multihop method) that directly transmits information to the base station,
  • a communication system (multi-hop system) that transmits information to a base station by relaying information between wireless relay stations is generally known.
  • the non-multihop wireless communication since a large number of base stations cannot be provided, the communication distance between the wireless device slave unit and the base station is long. For this reason, the transmission system for transmitting information from the wireless device slave unit is complicated and requires more energy (power consumption). In some cases, radio from the wireless device slave unit may not reach the base station.
  • multi-hop wireless communication requires a plurality of wireless relay stations necessary for relaying, but between a wireless device slave unit and a wireless relay station, between a plurality of wireless relay stations, or between a wireless relay station and a base station.
  • a transmission system for transmitting information from the wireless device slave unit can be simplified and energy can be kept low.
  • this wireless communication using the multi-hop method since it passes through a plurality of wireless relay stations, it is important to establish a communication path in order to ensure communication quality.
  • FIG. 7A is an explanatory diagram showing a communication configuration of the communication system
  • FIG. 7B is an operation example of the communication system. It is explanatory drawing shown.
  • a communication system 999 illustrated in FIG. 7A includes a parent device 901 that collects customer information from a plurality of consumers 994, and a customer device 901 that is provided in each of the plurality of consumers 994 and receives customer information of each customer 994. And a management device 903 provided in each customer 994 and acquiring customer information of the customer 994 from the child device 902. Then, the communication system 999 acquires customer information of the customer 994 with the slave unit 902, and performs multi-hop communication by using another slave unit 902 existing nearby as a repeater, whereby each customer 994 customer information is collected.
  • FIG. 7B shows an example of a specific multi-hop communication method in the communication system 999.
  • the communication system 999 first, when a data acquisition request is issued from the parent device 901A to the child device 902a, the child device 902a that has received the data request signal from the parent device 901A, as shown in FIG.
  • the data signal (customer information) acquired by the consumer 994a is transmitted to the surroundings. In that case, customer information is transmitted also to the management apparatus 903a of the same customer 994a.
  • the slave unit 902b existing near the slave unit 902a follows a predetermined communication route (communication route) and includes a data signal (customer) including communication route information. Information) to the surroundings.
  • a predetermined communication route communication route
  • each slave unit 902 periodically transmits a hello message (confirmation signal) to the slave unit 902 that exists in a range where the signal (radio wave) can reach directly.
  • the message reception status (reception field strength, etc.) is always judged.
  • the slave unit 902c existing in the vicinity of the slave unit 902b also transmits a data signal (customer information) including the communication path information to the surroundings according to a predetermined communication route.
  • a data signal (customer information) is transmitted to the slave unit (not shown) and the next slave unit (not shown) on the communication path of the mobile phone 901 to reach the master unit 901A.
  • a data acquisition request may be issued from the other parent device 901B to the child device 902a.
  • the data signal (customer information) acquired by the customer 994a is transferred to the repeater.
  • slave unit 902b, slave unit 902d, slave unit 902e, etc. are relayed to reach the master unit 901B.
  • Each parent device 901 collects customer information not only for one child device 902 but also for a plurality of other child devices 902.
  • the slave unit transmits data only when data is acquired, and is normally in a sleep state (power off or operation with minimum power). Conceivable.
  • the communication path communication route
  • the communication route cannot be established in the same way, and there are many communication routes from the child device to the parent device. Become. For this reason, there is a problem that traffic (traffic volume) increases and a burden on the parent device (including a repeater) increases.
  • An object of the present invention is to solve the above-described problems, and to provide a multi-hop wireless communication system that can stably perform communication from a child device to the parent device even if the child device has a small amount of power supply. .
  • the multi-hop wireless communication system of the present invention includes a slave unit having a slave unit transmitting unit that transmits a data signal including data by radio waves, a relay receiving unit that receives the data signal,
  • a multi-hop communication system comprising: a repeater having a relay transmission unit that transmits a data signal to the outside by the radio wave; and a master unit having a master unit reception unit that receives the data signal from the repeater.
  • a base unit transmitting unit for transmitting a first information signal including the base unit identification information for identifying itself and a data transmission request signal for acquiring the data signal to the outside by the radio wave;
  • a base unit control unit that controls the base unit transmission unit and the base unit reception unit, and the relay unit, the relay control unit that controls the relay reception unit and the relay transmission unit, and the slave unit Store data signal
  • a second information signal including slave unit identification information for identifying the slave unit using power from environmental power generation such as solar power generation or vibration power generation, and the data signal.
  • the repeater receives the second information signal and the data signal from the slave unit and stores them in the storage unit, and the repeater receives the data transmission request signal from the master unit. Based on this, the stored data signal is transmitted along a predetermined transmission path.
  • the slave unit since the slave unit only acquires data and transmits a data signal, the power of energy harvesting consumed by the slave unit for data acquisition and data transmission is reduced. Can be minimized.
  • the data signal stored in the repeater is transmitted according to a predetermined transmission path, the data signal can be reliably transmitted from the slave unit to the master unit via the repeater. As a result, even a slave unit with little power supply can stably transmit data from the slave unit to the master unit.
  • the relay control unit of the repeater determines the received signal strength of the first information signal to identify itself to the received first information signal.
  • the master device identification information and the order history of the relay device identification information are also added, and the first information signal is transmitted.
  • the repeater storing the data signal directly transmitted from the slave unit is used as a terminal repeater, and the reverse path of the order history from the master unit to the terminal repeater is changed to the data in the predetermined slave unit. It is characterized by being determined as a signal transmission path.
  • transmission from the slave unit to the master unit can be easily and reliably performed according to the transmission path.
  • the relay control unit of the repeater has a first identification threshold value that is compared with the received signal strength of the first information signal, and is equal to or greater than the first identification threshold value.
  • the first information signal is transmitted when the received signal strength is received.
  • the multi-hop wireless communication system of the present invention is characterized in that the repeater has a plurality of the first identification threshold values with different values.
  • the first identification threshold can be selected according to the environment in which the multi-hop wireless communication system is selected. As a result, an optimum transmission path according to the environment can be determined, and communication from the slave unit to the master unit via the repeater can be performed more stably.
  • the relay control unit of the repeater has a second identification threshold value that is compared with the received signal strength of the second information signal, and is equal to or greater than the second identification threshold value.
  • the received second information signal is stored in the storage unit.
  • communication from the slave unit to the repeater can be performed more stably, and the transmission path for transmitting the data signal from the repeater to the master unit can be narrowed down.
  • base station can be performed more stably, suppressing traffic (traffic volume).
  • the multi-hop wireless communication system of the present invention is characterized in that the repeater has a plurality of the second identification threshold values with different values.
  • the second identification threshold can be selected according to the environment in which the multi-hop wireless communication system is selected. As a result, an optimum transmission path according to the environment can be determined, and communication from the slave unit to the master unit via the repeater can be performed more stably.
  • the received signal strength of the second information signal in the terminal repeater in which the parent device control unit stores the data signal of the predetermined child device is a designated terminal repeater in the predetermined slave unit.
  • the transmission from the slave unit to the designated terminal repeater (repeater) can be stably performed, and the slave unit to the master unit through the transmission path including the designated terminal repeater (repeater). Communication can be performed more stably. Further, since the transmission path of the data signal from one slave unit is narrowed down to one, traffic (traffic volume) can be greatly suppressed.
  • the base unit control unit transmits the first information signal at a predetermined timing, and the relay control unit determines the received signal strength of the most recent first information signal. It is characterized in that the latest transmission path is determined based on the determination.
  • the strongest transmission path with the latest received signal strength is constructed at a predetermined timing. be able to. As a result, communication from the slave unit to the master unit via the repeater can be performed more stably.
  • the slave unit since the slave unit only acquires data and transmits a data signal, the power of the energy harvesting consumed by the slave unit for data acquisition and data transmission is minimized. Can do.
  • the data signal stored in the repeater is transmitted according to a predetermined transmission path, the data signal can be reliably transmitted from the slave unit to the master unit via the repeater. As a result, even a slave unit with little power supply can stably transmit data from the slave unit to the master unit.
  • FIG. 1 is an explanatory diagram showing the configuration of a multi-hop wireless communication system 101 according to the first embodiment of the present invention.
  • FIG. 2 is a block diagram showing a configuration of the multi-hop wireless communication system 101 according to the first embodiment of the present invention.
  • a multi-hop wireless communication system 101 includes a slave unit A1 that transmits a data signal DS including data by radio waves, and a plurality of repeaters that transmit and receive the data signal DS. R5 (R51 to R59) and a master unit Z9 that receives the data signal DS from the repeater R5.
  • all of the slave unit A1, the repeater R5, and the master unit Z9 are provided with an antenna AT for transmitting and receiving radio waves as shown in FIG.
  • the antenna AT various types of antennas such as a general linear antenna, a loop antenna, and a planar antenna can be used, and the gist of the present invention is not limited. To do.
  • the multi-hop wireless communication system 101 converts, for example, data obtained by the data source 500 such as a measuring instrument or a measuring instrument into a data signal DS, and transmits the data from the slave unit A1 connected to the data source 500 via the antenna AT.
  • This is a system that radiates with radio waves, further propagates the data signal DS via the repeater R5, transmits the data signal DS to the master unit Z9, and communicates the data.
  • the slave unit A1 of the multi-hop wireless communication system 101 controls the generator EN1 that performs environmental power generation such as solar power generation and vibration power generation, the slave unit transmission unit 11 that transmits the data signal DS, and the slave unit transmission unit 11. It has a slave unit control unit 51 and an antenna AT for transmitting radio waves.
  • the power generator EN1 of the child device A1 is a device that performs environmental power generation (referred to as energy harvesting, energy harvesting, energy harvesting, energy harvesting, etc.) such as solar power generation or vibration power generation. It does not use a power source supplied from a capacitor or an electric wire. In other words, it is a device that generates electric power by collecting energy such as sunlight, illumination light, vibration generated by a machine, and heat. In particular, energy harvesting is power generation that converts a small amount of energy around us into electric power.
  • This power generator EN1 is connected to the handset transmitter 11 and handset control section 51, and supplies power only when it generates power.
  • the slave unit transmission unit 11 of the slave unit A1 includes a signal processing circuit and a transmission circuit, and a digital signal including data obtained from the data source 500 is converted into an analog signal by the signal processing circuit. It is converted to DS. And the subunit
  • the slave unit transmission unit 11 also transmits a signal including the slave unit identification information of the slave unit A1 that identifies itself (hereinafter referred to as the second information signal ID2) simultaneously with the data signal DS.
  • the child device control unit 51 of the child device A1 is manufactured using an integrated circuit (IC) and is connected to the child device transmission unit 11 to control the child device transmission unit 11.
  • IC integrated circuit
  • the relay R5 includes a relay transmission unit 15 that transmits the data signal DS, a relay reception unit 35 that receives the data signal DS, and a relay control that controls the relay transmission unit 15 and the relay reception unit 35.
  • Unit 55 storage unit 95 that stores data signal DS from slave unit A1, and antenna AT for transmitting and receiving radio waves.
  • the relay transmitter 15 of the repeater R5 is configured to include an amplifier circuit and a transmitter circuit, and an amplifier circuit receives the data signal DS or the second information signal ID2 from the slave unit A1 received by the relay receiver 35.
  • the data signal DS or the second information signal ID2 is transmitted to the outside by radio waves in the transmission circuit via the antenna AT that is amplified and connected.
  • the relay transmission unit 15 amplifies a first information signal ID1 (described later) received from the base unit Z9 received by the relay reception unit 35 by an amplifier circuit, and externally transmits a radio wave by the transmission circuit via the antenna AT. Sending.
  • the relay transmission unit 15 transmits the relay identification information of the relay R5 that identifies itself to the first information signal ID1 and the second information signal ID2 at the same time.
  • the relay receiving unit 35 of the repeater R5 is configured to include a receiving circuit, and includes the data signal DS and the second information signal ID2 propagated from the slave unit A1 or via the repeater R5, and the master unit Z9. Alternatively, the first information signal ID1 propagated through the relay R5 is received by the receiving circuit and transmitted to the relay transmitting unit 15.
  • the relay receiving unit 35 is configured to have an intensity display circuit, and calculates the received signal strength (RSSI) of the received first information signal ID1 and transmits it to the relay control unit 55. Further, the relay receiving unit 35 calculates the received signal strength (RSSI) of the received data signal DS and the second information signal ID2, and transmits the calculated signal strength to the relay control unit 55.
  • RSSI received signal strength
  • the relay control unit 55 of the repeater R5 is connected to the relay transmission unit 15 and the relay reception unit 35, and controls the relay transmission unit 15 and the relay reception unit 35. Further, the relay control unit 55 compares the received signal strength (RSSI) of the first information signal ID1 with an identification threshold value (first threshold value described later) which is a predetermined value, or receives the received signal strength (RSSI) of the data signal DS. ) And a data threshold value (second threshold value to be described later) which is a predetermined value, information such as repeater identification information included in the first information signal ID1 and slave unit identification information included in the second information signal ID2 Or take out.
  • RSSI received signal strength
  • the storage unit 95 of the repeater R5 uses an internal storage device such as a memory or an external storage device such as a memory card.
  • the storage unit 95 stores the data signal DS from the slave unit A1 and includes repeater identification information.
  • Information such as 1 information signal ID1 and 2nd information signal ID2 containing subunit
  • the storage unit 95 stores an identification threshold value that is a predetermined value.
  • the master unit Z9 includes a master unit transmission unit 19 that transmits a first information signal ID1 including a data transmission request signal RS for obtaining the data signal DS, and a data signal from the repeater R5.
  • a base unit receiving unit 39 for receiving a DS a base unit controlling unit 59 for controlling the base unit transmitting unit 19 and the base unit receiving unit 39, a recording unit 99 for storing predetermined values, etc., for transmitting and receiving radio waves And an antenna AT.
  • the base unit transmission unit 19 of the base unit Z9 is configured to include a transmission circuit, and receives the first information signal ID1 including the data transmission request signal RS for obtaining the data signal DS from the connected antenna AT.
  • the first information signal ID1 is transmitted by radio waves to the outside of the master unit Z9 by radiating the first information signal ID1 by the transmission circuit via the.
  • the parent device transmission unit 19 simultaneously transmits the parent device identification information of the parent device Z9 that identifies itself to the first information signal ID1.
  • the base unit receiving unit 39 of the base unit Z9 is configured to include a receiving circuit and a signal processing circuit, and the receiving circuit receives the data signal DS and the second information signal ID2 propagated through the repeater R5.
  • the digital signal is converted into a digital signal by the signal processing circuit and transmitted to the parent device control unit 59.
  • the parent device control unit 59 of the parent device Z9 is connected to the parent device transmission unit 19 and the parent device reception unit 39, and controls the parent device transmission unit 19 and the parent device reception unit 39.
  • the base unit control unit 59 stores the data of the data source 500 converted into a digital signal by the base unit receiving unit 39 in the recording unit 99, stores the data signal DS propagated through the repeater R5, Information such as handset identification information and repeater identification information included in the second information signal ID2 is extracted.
  • the parent device control unit 59 controls the parent device transmission unit 19 to transmit the first information signal ID1 at a predetermined timing.
  • the predetermined timing indicates a timing at which a certain time has elapsed, a timing at which the data signal DS is received a certain number of times, or the like.
  • the master unit Z9 transmits the received data to an external device connected by wire.
  • the recording unit 99 of the master unit Z9 records data of the data source 500 and stores predetermined values and the like.
  • FIG. 3 is a flowchart for explaining the procedure of the multi-hop wireless communication system 101, and is a flowchart A showing a transmission method of the first information signal ID1.
  • FIG. 4 is a flowchart illustrating the procedure of the multi-hop wireless communication system 101, and is a flowchart B illustrating a method for transmitting the second information signal ID2.
  • base unit Z9 determines whether or not it is a predetermined timing for transmitting first information signal ID1. In the case of the predetermined timing, the base unit Z9 transmits the first information signal ID1 including the base unit identification information from the base unit transmission unit 19. At this time, the data transmission request signal RS for obtaining the data signal DS may be included in the first information signal ID1.
  • the repeater R5 arranged in the vicinity of the master unit Z9 receives the transmitted first information signal ID1 by the relay receiving unit 35.
  • the relay control unit 55 determines whether or not the received signal strength (RSSI) of the first information signal ID1 is a certain level or more. Specifically, the relay control unit 55 of the repeater R5 compares the received signal strength (RSSI) of the first information signal ID1 with the first identification threshold value stored in the storage unit 95, and receives the received signal. It is determined whether the strength (RSSI) is greater than or equal to the first identification threshold.
  • RSSI received signal strength
  • the repeater R5 receives the first information signal ID1 with the received signal strength (RSSI) equal to or higher than the first identification threshold.
  • the signal with the weak received signal strength (RSSI) is It is determined as one information signal ID1, and this first information signal ID1 is not adopted.
  • the repeater R51 and the repeater R53 that are relatively close to the base unit Z9 shown in FIG.
  • the repeater R54 that employs the signal ID1 and is relatively far from the master unit Z9 receives the first information signal ID1 with a received signal strength (RSSI) that is equal to or less than a certain first identification threshold value, and therefore employs the first information signal ID1.
  • RSSI received signal strength
  • the first identification threshold value has a plurality of different values, and the strength of the received signal strength (RSSI) of the first information signal ID1 received with the magnitude of the first identification threshold value is different.
  • RSSI received signal strength
  • the first information signal ID1 can be selected.
  • the repeater R51 can select the first information signal ID1
  • all of the repeaters R51, R53, and R54 can select the first information signal ID1.
  • a 1st identification threshold value can be selected and it can utilize in order to determine the optimal transmission path TP according to the environment.
  • the relay control unit 55 of the repeater R5 confirms whether or not its own repeater identification information is included in the first information signal ID1. If the first information signal ID1 does not include its own repeater identification information, the relay control unit 55 stores the first information signal ID1 in the storage unit 95. On the other hand, when the first information signal ID1 includes its own repeater identification information, the relay control unit 55 discards the first information signal ID1 without storing it in the storage unit 95. Yes.
  • the relay control unit 55 of the repeater R5 adds the master unit identification information, its own repeater identification information, and its order history, and relays the first information signal ID1 to the outside. 15 for transmission.
  • the repeater R51 and the repeater R53 shown in FIG. 1 have received a received signal strength (RSSI) that is equal to or higher than a first identification threshold value, the repeater identification information is added to the history directly received from the master unit Z9. Thus, the first information signal ID1 is transmitted to the outside.
  • RSSI received signal strength
  • the repeater R5 arranged in the vicinity of the repeater R5 to which the first information signal ID1 is transmitted is the first information signal to which the identification information (master unit identification information and repeater identification information) and history information are added. ID1 is received by the relay receiving unit 35, and the relay control unit 55 determines whether or not the received signal strength (RSSI) of the first information signal ID1 is greater than or equal to a certain value (first identification threshold).
  • RSSI received signal strength
  • the repeater R5 arranged in the vicinity of the repeater R51 shown in FIG. 1 is the repeater R52, the repeater R53, and the repeater R55. Each of the repeater R52, the repeater R53, and the repeater R55 is the first repeater.
  • the information signal ID1 is received, and it is determined whether or not the received signal strength (RSSI) of the first information signal ID1 is greater than or equal to a certain value (first identification threshold).
  • RSSI received signal strength
  • the relay R5 arranged in the vicinity of the relay R53 shown in FIG. 1 becomes the relay R51, the relay R54, and the relay R56, and each of the relay R51, the relay R54, and the relay R56 includes the first information.
  • the signal ID1 is received, and it is determined whether or not the received signal strength (RSSI) of the first information signal ID1 is greater than or equal to a certain value (first identification threshold).
  • each relay R5 (relay control unit 55) arranged in the vicinity of the relay R5 to which the first information signal ID1 is transmitted has a received signal strength (RSSI) equal to or higher than the first identification threshold.
  • RSSI received signal strength
  • the first information signal ID1 is adopted, and when the first information signal ID1 does not include its own repeater identification information, the first information signal ID1 is stored in the storage unit 95.
  • the repeater R5 determines that the received information strength (RSSI) is weak as the first information signal ID1.
  • the first information signal ID1 is discarded without being adopted.
  • the repeater R5 that has received the first information signal ID1 with a received signal strength (RSSI) equal to or higher than a certain first identification threshold adds its own repeater identification information to the previous history (history information) and renews it.
  • the first information signal ID1 is transmitted to the outside by the relay transmission unit 15.
  • Each repeater R5 performs such a procedure, and the first information signal ID1 from the master unit Z9 propagates between the repeaters R5.
  • the repeater R5 (relay control unit 55) 1 information signal ID1 is not preserve
  • the transmission method of the second information signal ID2 is transmitted in accordance with the transmission method of the data signal DS.
  • the slave unit A1 when the slave unit A1 obtains power from the energy harvesting and transmits the data signal DS, the slave unit A1 includes the slave unit identification information of the slave unit A1 that identifies itself. 2nd information signal ID2 is transmitted in the subunit
  • the relay control unit 55 determines whether or not the received signal strength (RSSI) of the second information signal ID2 is greater than or equal to a certain value.
  • the relay control unit 55 of the repeater R5 compares the received signal strength (RSSI) of the second information signal ID2 with the second identification threshold value stored in the storage unit 95, and receives the received signal. It is determined whether the strength (RSSI) is greater than or equal to the second identification threshold.
  • the repeater R5 when the repeater R5 (relay controller 55) receives the second information signal ID2 with a received signal strength (RSSI) equal to or higher than the second identification threshold, the second information signal ID2 is adopted.
  • the repeater R5 when the repeater R5 (relay control unit 55) receives the second information signal ID2 with the received signal strength (RSSI) equal to or lower than the second identification threshold, the repeater R5 (relay control unit 55)
  • the second information signal ID2 is determined, and the second information signal ID2 is not adopted.
  • the repeater R58 and the repeater R59 that are relatively close to the child device A1 shown in FIG.
  • the repeater R56 that employs the signal ID2 and is relatively far from the master unit Z9 receives the second information signal ID2 with a received signal strength (RSSI) that is less than or equal to a second identification threshold, and therefore employs the second information signal ID2.
  • RSSI received signal strength
  • the second identification threshold value has a plurality of different values as well as the first identification value, and the second information signal ID2 received with the magnitude of the second identification threshold value is different.
  • the difference between the strengths of the received signal strengths (RSSI) can be distinguished, and the selection of the second information signal ID2 can be selected.
  • RSSI received signal strengths
  • only the relay R59 can select the second information signal ID2, or all of the relay R56, the relay R58, and the relay R59 can select the second information signal ID2.
  • a 2nd identification threshold value can be selected and it can utilize in order to determine the optimal transmission path TP according to the environment.
  • the relay control unit 55 of the repeater R5 confirms whether or not its own repeater identification information is included in the second information signal ID2. If the second information signal ID2 does not include its own repeater identification information, the relay control unit 55 stores the second information signal ID2 and the data signal DS in the storage unit 95. On the other hand, if the second information signal ID2 includes its own repeater identification information, the relay control unit 55 discards the second information signal ID2 without storing it in the storage unit 95. Yes. Although not shown, when the second information signal ID2 and the data signal DS are stored in the storage unit 95, the relay control unit 55 confirms the second information signal ID2 and connects the other repeater R5.
  • the received signal strength (RSSI) at this time is also stored in the storage unit 95.
  • the repeater R5 is positioned as a terminal repeater that stores the data signal DS of the predetermined slave unit A1.
  • the relay control unit 55 of the repeater R5 adds the slave unit identification information, its own repeater identification information, and its order history, and relays the second information signal ID2 to the outside. 15 for transmission.
  • the repeater R58 and the repeater R59 shown in FIG. 1 have received the second information signal ID2 with a received signal strength (RSSI) equal to or greater than a certain second identification threshold, so that the history directly received from the slave unit A1
  • the repeater identification information is added to form the second information signal ID2, and the second information signal ID2 is transmitted to the outside.
  • the data signal DS may be transmitted simultaneously with the second information signal ID2.
  • the repeater R5 arranged in the vicinity of the repeater R5 to which the second information signal ID2 is transmitted is the second information signal to which the identification information (master unit identification information and repeater identification information) and history information are added. ID2 is received, and it is determined whether or not the received signal strength (RSSI) of the second information signal ID2 is greater than or equal to a certain value (second identification threshold).
  • RSSI received signal strength
  • the repeater R5 arranged in the vicinity of the repeater R58 shown in FIG. 1 is the repeater R55 and the repeater R56, and each of the repeater R55 and the repeater R56 receives the second information signal ID2 at the repeater receiving unit 35.
  • the relay control unit 55 determines whether or not the received signal strength (RSSI) of the second information signal ID2 is equal to or greater than a certain value (second identification threshold). For example, the repeater R5 arranged in the vicinity of the repeater R59 shown in FIG. 1 becomes the repeater R56 and the repeater R57, and each of the repeater R56 and the repeater R57 receives the second information signal ID2, It is determined whether or not the received signal strength (RSSI) of the information signal ID2 is greater than or equal to a certain value (second identification threshold).
  • RSSI received signal strength
  • each relay R5 (relay control unit 55) arranged in the vicinity of the relay R5 to which the second information signal ID2 is transmitted has a received signal strength (RSSI) equal to or higher than the second identification threshold.
  • RSSI received signal strength
  • the second information signal ID2 is stored in the storage unit 95 when the second information signal ID2 does not include its own repeater identification information.
  • the repeater R5 (relay control unit 55) sends a signal having a weak received signal strength (RSSI) to the second information signal ID2. And discarding the second information signal ID2 without adopting it.
  • the relay control unit 55 stores the data signal DS in the storage unit 95 at the same time.
  • the repeater R5 that has received the second information signal ID2 with a received signal strength (RSSI) equal to or greater than a certain second identification threshold adds its own repeater identification information to the previous history (history information) and renews it.
  • the relay information transmission unit 15 transmits the second information signal ID2 that has been transmitted to the outside.
  • Such a procedure is performed by each repeater R5, and the second information signal ID2 from the slave unit A1 propagates between the repeaters R5.
  • the second information signal ID2 propagates through the repeater R5 with a stronger combination of received signal strengths (RSSI), so that communication from the slave unit A1 to the repeater R5 can be performed more stably. it can.
  • RSSI received signal strength
  • the base unit Z9 receives the second information signal ID2 from the repeater R5 arranged in the vicinity of the base unit Z9 by the base unit receiving unit 39, and receives the received second information signal ID2 of the base unit Z9. Save in the recording unit 99.
  • 2nd information signal ID2 is transmitted from subunit
  • the relay control unit 55 of the relay R5 transmits the second information signal ID2 having the received signal strength (RSSI) equal to or higher than the second identification threshold.
  • the transmission path TP for transmitting the data signal DS from the repeater R5 to the master unit Z9 can be narrowed down, and traffic (traffic volume) can be suppressed.
  • FIG. 5 is a flowchart for explaining the procedure of the multi-hop wireless communication system 101, and is a flowchart C showing a method for determining the transmission path TP.
  • the base unit Z9 (base unit control unit 59) confirms all the second information signals ID2 received by the base unit receiving unit 39 and stored in the recording unit 99. Then, the master unit Z9 (master unit control unit 59) extracts and compares the slave unit identification information, the relay unit identification information, and the history recorded in each second information signal ID2.
  • the parent device control unit 59 sets the relay device R5 to which the second information signal ID2 (including the data signal DS) is directly transmitted from the predetermined child device A1 among the relay devices R5 to the end of the predetermined child device A1.
  • One or more repeaters are specified.
  • the parent device control unit 59 compares the order histories of the first information signal ID1 stored in each terminal repeater, which is the relay device R5, and the terminal device from the parent device Z9 in the order history.
  • the route with the smallest order history to the repeater is extracted, and the first information signal ID1 having this route is selected.
  • the reverse path of the order history path is employed as the transmission path TP1 for the data signal DS in the predetermined slave unit A1.
  • the data signal DS can be easily and reliably transmitted from the slave unit A1 to the master unit Z9 via the repeater R5, and the transmission path TP1 of the data signal DS from one slave unit A1 can be transmitted. Since it is limited to one, traffic (traffic volume) can be greatly reduced.
  • the base unit control unit 59 selects the terminal relay having the highest received signal strength (RSSI) of the stored second information signal ID2 among the specified terminal relays as the designated terminal relay in the predetermined slave unit A1. As specified. Then, the order history of the first information signal ID1 stored in the terminal repeater, which is the designated terminal repeater, is extracted, and the data signal DS is transmitted in the predetermined slave unit A1 through the reverse route of this order history route. It is also adopted as the route TP2. As a result, communication from the slave unit A1 to the repeater R5 can be performed stably, and the transmission path TP2 of the data signal DS from one slave unit A1 is narrowed down to one, so traffic (traffic volume) Can be greatly suppressed.
  • RSSI received signal strength
  • the received signal strength (RSSI) of the second information signal ID2 (data signal DS) received by the designated terminal repeater is the highest, the transmission signal strength of the data signal DS transmitted by the slave unit A1 is kept low. Can also be reliably received by the designated terminal repeater. As a result, the power required for transmission from the slave unit A1 can be kept low.
  • the base unit 9Z base unit control unit 59
  • the route TP2) is determined as the transmission route TP of the data signal DS in the predetermined slave unit A1.
  • the parent device 9Z parent device control unit 59
  • the order history is reflected only when the received signal strength (RSSI) of the first information signal ID1 is a received signal strength (RSSI) equal to or higher than the first identification threshold.
  • RSSI received signal strength
  • Communication between the relays R5 and between the relay R5 and the master unit Z9 is performed reliably.
  • communication from the terminal repeater (relay R5) to the master unit Z9 can be performed more stably.
  • the transmission path TP is determined in the first embodiment of the present invention. As a result, it is possible to determine an optimal transmission path TP with a received signal strength (RSSI) equal to or higher than the first identification threshold.
  • RSSI received signal strength
  • the master unit Z9 transmits the first information signal ID1 at a predetermined timing (the time and the number of times described above). Then, the relay control unit 55 of the repeater R5 that has received the latest first information signal ID1 determines the latest received signal strength (RSSI) of the first information signal ID1, and based on this determination, described above. According to the procedure, the latest transmission path TP is determined. For this reason, even if a state in which the received signal strength (RSSI) is weakened due to some external factor occurring between the communication paths continues to be transmitted with the strongest received signal strength (RSSI) at a predetermined timing. A route TP can be constructed. The latest transmission path TP is overwritten and saved as the latest transmission path TP in the storage unit 95 of the repeater R5 and the recording unit 99 of the master unit Z9.
  • RSSI received signal strength
  • the base unit control unit 59 of the base unit Z9 includes the determined transmission path TP in the first information signal ID1, and transmits the first information signal ID1 via the base unit transmission unit 19 and the antenna AT. . Then, by the transmission method shown in FIG. 3 described above, the determined transmission path TP from the parent device Z9 is propagated to each repeater R5. As a result, the relay R5 included in the determined transmission path TP stores it in the storage unit 95 as a predetermined transmission path TP.
  • FIG. 6 is a flowchart D of the data signal DS transmission / reception method.
  • the slave unit A1 (slave unit transmitter 11) obtains power from the energy harvesting, acquires data from the data source 500, and analogizes this data from the digital signal by the signal processing circuit.
  • the data is converted into a signal, and the data signal DS is generated by the slave transmitter 11.
  • the slave unit transmission unit 11 of the slave unit A1 obtains power from the energy harvesting and transmits the data signal DS to the outside by radio waves in the transmission circuit via the connected antenna AT.
  • the second information signal ID2 including the slave unit identification information is simultaneously transmitted.
  • the slave unit A1 since the slave unit A1 only acquires data and transmits the data signal DS, the power of energy harvesting consumed by the slave unit A1 for data acquisition and data transmission can be minimized.
  • the terminal repeater (relay R5) arranged in the vicinity of the slave unit A1 receives the data signal DS (including the second information signal ID2) transmitted from the slave unit A1. Receive. Then, the relay control unit 55 of the terminal repeater (relay R5) determines whether or not the received signal strength (RSSI) of the second information signal ID2 is equal to or greater than the second identification threshold stored in the storage unit 95. Then, this data signal DS (including the second information signal ID2) is stored in the storage unit 95.
  • RSSI received signal strength
  • the master unit Z9 transmits a data transmission request signal RS for acquiring the data signal DS from the master unit transmission unit 19 in order to acquire data from the data source 500, as shown in FIG.
  • the relay R5 receives the transmitted data transmission request signal RS by the relay receiving unit 35, and then transmits the data transmission request signal RS by the relay transmitting unit 15. In this way, the repeater R5 existing before reaching the terminal repeater performs this reception and transmission.
  • the terminal repeater (relay R5) arranged in the vicinity of the child device A1 receives the data transmission request signal RS propagated from the parent device Z9 via the plurality of repeaters R5. Receive. Then, the terminal repeater (relay R5) transmits the data signal DS stored in the storage unit 95 by the relay transmission unit 15 based on the data transmission request signal RS.
  • the relay R5 allocated in the transmission path TP receives the transmitted data signal DS by the relay receiving unit 35, and then transmits the data signal DS by the relay transmitting unit 15. In this way, the relay R5 allocated in the transmission path TP that exists until reaching the master unit Z9 performs this reception and transmission.
  • the master unit Z9 receives the data signal DS. Then, base unit Z9 stores this data signal DS in recording unit 99.
  • the relay device R5 transmits and propagates the data signal DS transmitted from the child device A1 according to a predetermined transmission path TP.
  • the data signal DS can be reliably transmitted from the slave unit A1 to the master unit Z9 via the repeater R5. Note that the data included in the data signal DS is transmitted to an external device connected by wire.
  • the slave unit A1 since the slave unit A1 only acquires and transmits the data signal DS, the energy harvesting consumed by the slave unit A1 for data acquisition and data transmission is performed. Electric power can be minimized.
  • the repeater R5 stores the data signal DS transmitted by the slave unit A1 in the storage unit 95, and the stored data signal DS is determined in advance based on the data transmission request signal RS from the master unit Z9. Since transmission is performed according to TP, the data signal DS can be reliably transmitted from the slave unit A1 to the master unit Z9 via the repeater R5. As a result, even if the slave unit A1 has a low power supply, "transmission from the slave unit A1 to the master unit Z9" can be performed stably.
  • the relay control unit 55 of the repeater R5 determines the received signal strength (RSSI) of the first information signal ID1 from the master unit Z9, so that the first information signal ID1 is transmitted next and the order history is transmitted.
  • the base unit controller 59 of the base unit Z9 specifies the terminal repeater that stores the data signal DS transmitted directly from the predetermined handset A1, and reverses the order history from the base unit Z9 to the terminal repeater.
  • the route is determined as the transmission route TP.
  • the order history is reflected only when the received signal strength (RSSI) of the first information signal ID1 is the received signal strength (RSSI) equal to or higher than the first identification threshold. Communication between the repeaters R5 and between the repeater R5 and the master unit Z9 is reliably performed. As a result, communication from the terminal repeater (relay R5) to the master unit Z9 can be performed more stably.
  • RSSI received signal strength
  • the repeater R5 since the repeater R5 has a plurality of first identification threshold values with different values, the first identification threshold value can be selected according to the environment in which the multi-hop wireless communication system 101 is selected. As a result, an optimal transmission path TP according to the environment can be determined, and communication from the slave unit A1 to the master unit Z9 via the repeater R5 can be performed more stably.
  • the received second information signal ID2 having the received signal strength (RSSI) equal to or higher than the second identification threshold is received
  • the received second information signal ID2 is stored in the storage unit 95, so that the second information signal ID2 is the received signal. It propagates through the repeater R5 with a stronger combination of strength (RSSI). Therefore, communication from the slave unit A1 to the repeater R5 can be performed more stably, and the transmission path TP for transmitting the data signal DS from the repeater R5 to the master unit Z9 can be narrowed down. Thus, communication from the child device A1 to the parent device Z9 can be performed more stably while suppressing traffic (traffic volume).
  • the repeater R5 since the repeater R5 has a plurality of second identification threshold values with different values, the second identification threshold value can be selected according to the environment in which the multi-hop wireless communication system 101 is selected. As a result, an optimal transmission path TP according to the environment can be determined, and communication from the slave unit A1 to the master unit Z9 via the repeater R5 can be performed more stably.
  • the designated terminal repeater since the terminal repeater having the highest received signal strength (RSSI) of the second information signal ID2 from the predetermined slave unit A1 is used as the designated end repeater in the predetermined slave unit A1, the designated terminal repeater is relayed from the slave unit A1.
  • the transmission to the receiver (repeater R5) can be performed stably, and the transmission route TP (transmission route TP1) including the designated terminal repeater (repeater R5) can be used to send the slave device A1 to the master device Z9. Communication can be performed stably. Further, since the transmission path TP of the data signal DS from one slave unit is narrowed down to one, traffic (traffic volume) can be significantly suppressed.
  • the master unit Z9 transmits the first information signal ID1 at a predetermined timing (the time and the number of times described above). Then, the relay control unit 55 of the repeater R5 that has received the latest first information signal ID1 determines the latest received signal strength (RSSI) of the first information signal ID1, and based on this determination, described above. According to the procedure, the latest transmission path TP is determined. For this reason, even if a state in which the received signal strength (RSSI) is weakened due to some external factor occurring between the communication paths continues to be transmitted with the strongest received signal strength (RSSI) at a predetermined timing. A route TP can be constructed.
  • the first information signal ID1 is used to obtain the order history from the master unit Z9 to the terminal repeater (repeater R5), and the reverse path of this order history is transmitted to the data in the predetermined slave unit A1.
  • the present invention is not limited to this.
  • a route distinguished by the second information signal ID2 having the received signal strength (RSSI) equal to or higher than the second identification threshold by the relay control unit 55 of the repeater R5 using the second information signal ID2 may be set as the transmission route TP3. .
  • the terminal repeater having the highest received signal strength (RSSI) of the second information signal ID2 is used as the predetermined slave unit.
  • RSSI received signal strength
  • the designated terminal repeater is used in the machine A1, it is not limited to this.
  • the position information of the repeater R5 arranged for the predetermined slave unit A1 may be registered in advance, and the repeater R5 closest to the predetermined slave unit A1 may be used as the designated terminal repeater.

Abstract

[Problem] To provide a multihop wireless communication system capable of stably performing communication from a slave unit to a master unit even in the case of the slave unit having a small power supply. [Solution] A multihop wireless communication system is provided with: a slave unit A1 that transmits a data signal DS including data; a relay R5 that comprises a relay transmission unit for transmitting the data signal and a relay reception unit for receiving the data signal; and a master unit Z9 that comprises a master unit transmission unit for transmitting a first information signal including a data transmission request signal RS for acquiring the data signal DS and a master unit reception unit for receiving the data signal DS, and is characterized in that the slave unit A1 transmits a second information signal including slave unit identification information specifying the slave unit and the data signal DS using electric power from energy harvesting, the relay R5 receives the second information signal and the data signal DS and stores the second information signal and the data signal DS in a storage unit 95 thereof, and the relay R5 transmits the stored data signal DS along a predetermined transmission path TP on the basis of the data transmission request signal RS from the master unit Z9.

Description

マルチホップ無線通信システムMulti-hop wireless communication system
　本発明は、子機から中継器を介して親機にデータを送信するマルチホップ無線通信システムに関する。 The present invention relates to a multi-hop wireless communication system that transmits data from a slave unit to a master unit via a repeater.
　ある無線装置子機（子機）から基地局（親機）に無線で情報を伝達する通信方式は、基地局に直接的に情報の伝達を行う通信方式（非マルチホップ方式）や、複数の無線中継局間で情報を中継することによって基地局に情報の伝達を行う通信方式（マルチホップ方式）が一般的に知られている。 A communication method for wirelessly transmitting information from a certain wireless device slave unit (slave unit) to a base station (base unit) is a communication method (non-multihop method) that directly transmits information to the base station, A communication system (multi-hop system) that transmits information to a base station by relaying information between wireless relay stations is generally known.
　非マルチホップ方式による無線通信は、基地局の数を多く設けることができないことから、無線装置子機と基地局間での通信距離が長いものとなっていた。このため、無線装置子機から情報を送信するための送信システムが複雑且つより多くのエネルギー（消費電力）を必要していた。また、場合によっては、無線装置子機からの無線が基地局に届かないこともあった。 In the non-multihop wireless communication, since a large number of base stations cannot be provided, the communication distance between the wireless device slave unit and the base station is long. For this reason, the transmission system for transmitting information from the wireless device slave unit is complicated and requires more energy (power consumption). In some cases, radio from the wireless device slave unit may not reach the base station.
　一方、マルチホップ方式による無線通信は、中継に必要な無線中継局が複数個必要となるが、無線装置子機と無線中継局間或いは複数の無線中継局間或いは無線中継局と基地局間の通信距離が短くなることによって、無線装置子機から情報を送信するための送信システムが簡素にできエネルギーを低く抑えることができるという利点があった。しかしながら、このマルチホップ方式による無線通信では、複数の無線中継局を経由することから、通信品質の確保のために、通信経路を確立することが重要であった。 On the other hand, multi-hop wireless communication requires a plurality of wireless relay stations necessary for relaying, but between a wireless device slave unit and a wireless relay station, between a plurality of wireless relay stations, or between a wireless relay station and a base station. By shortening the communication distance, there is an advantage that a transmission system for transmitting information from the wireless device slave unit can be simplified and energy can be kept low. However, in this wireless communication using the multi-hop method, since it passes through a plurality of wireless relay stations, it is important to establish a communication path in order to ensure communication quality.
　このようなマルチホップ方式による無線通信の従来例として、特許文献１では、家庭（需要家９９４）の電力メータやガスメータに組み込んだ子機９０２が取得した需要家情報（電力やガスの使用量）を親機９０１送信する通信システム９９９が提案されている。図７は、従来例の通信システム９９９を説明する図であって、図７（ａ）は、通信システムの通信構成を示す説明図であり、図７（ｂ）は、通信システムの動作例を示す説明図である。 As a conventional example of such multi-hop wireless communication, in Patent Document 1, customer information (amount of power and gas used) acquired by a handset 902 incorporated in a home (customer 994) power meter or gas meter is disclosed. Has been proposed for a communication system 999 that transmits a base station 901. 7A and 7B are diagrams for explaining a communication system 999 of a conventional example. FIG. 7A is an explanatory diagram showing a communication configuration of the communication system, and FIG. 7B is an operation example of the communication system. It is explanatory drawing shown.
　図７（ａ）に示す通信システム９９９は、需要家情報を複数の需要家９９４から収集する親機９０１と、複数の需要家９９４にそれぞれ設けられ各需要家９９４の需要家情報を親機９０１に伝送する複数台の子機９０２と、各需要家９９４に設けられ当該需要家９９４の需要家情報を子機９０２から取得する管理装置９０３と、を備えて構成される。そして、通信システム９９９は、需要家９９４の需要家情報を子機９０２で取得し、近くに存在する他の子機９０２を中継器として利用して、マルチホップ通信を行うことにより、各需要家９９４の需要家情報を収集している。 A communication system 999 illustrated in FIG. 7A includes a parent device 901 that collects customer information from a plurality of consumers 994, and a customer device 901 that is provided in each of the plurality of consumers 994 and receives customer information of each customer 994. And a management device 903 provided in each customer 994 and acquiring customer information of the customer 994 from the child device 902. Then, the communication system 999 acquires customer information of the customer 994 with the slave unit 902, and performs multi-hop communication by using another slave unit 902 existing nearby as a repeater, whereby each customer 994 customer information is collected.
　また、図７（ｂ）では、通信システム９９９における具体的なマルチホップ通信方法の１例が示されている。通信システム９９９では、先ず、親機９０１Ａからデータ取得の要求が子機９０２ａに出された場合、親機９０１Ａからのデータ要求信号を受信した子機９０２ａは、図７（ａ）に示すように、需要家９９４ａで取得したデータ信号（需要家情報）を周囲に発信するようになる。その際には、同一の需要家９９４ａの管理装置９０３ａに対しても需要家情報が送信される。 FIG. 7B shows an example of a specific multi-hop communication method in the communication system 999. In the communication system 999, first, when a data acquisition request is issued from the parent device 901A to the child device 902a, the child device 902a that has received the data request signal from the parent device 901A, as shown in FIG. The data signal (customer information) acquired by the consumer 994a is transmitted to the surroundings. In that case, customer information is transmitted also to the management apparatus 903a of the same customer 994a.
　次に、子機９０２ａの近くに存在する子機９０２ｂは、図７（ｂ）に示すように、予め確定された通信ルート（通信経路）に従い、通信経路情報が含まれたデータ信号（需要家情報）を周囲に発信するようになる。この通信ルートを構築するにあたっては、各子機９０２は、信号（電波）が直接届く範囲に存在する子機９０２に対して、ハローメッセージ（確認信号）を定期的に送信しており、このハローメッセージの受信状況（受信電界強度など）を常に判断している。 Next, as shown in FIG. 7 (b), the slave unit 902b existing near the slave unit 902a follows a predetermined communication route (communication route) and includes a data signal (customer) including communication route information. Information) to the surroundings. In constructing this communication route, each slave unit 902 periodically transmits a hello message (confirmation signal) to the slave unit 902 that exists in a range where the signal (radio wave) can reach directly. The message reception status (reception field strength, etc.) is always judged.
　このようにして、子機９０２ｂの近くに存在する子機９０２ｃも、予め確定された通信ルートに従い、通信経路情報が含まれたデータ信号（需要家情報）を周囲に発信するようになり、次の通信経路にある子機（図示されていない）、次の子機（図示されていない）へとデータ信号（需要家情報）が伝送されて親機９０１Ａにまで到達する。 In this way, the slave unit 902c existing in the vicinity of the slave unit 902b also transmits a data signal (customer information) including the communication path information to the surroundings according to a predetermined communication route. A data signal (customer information) is transmitted to the slave unit (not shown) and the next slave unit (not shown) on the communication path of the mobile phone 901 to reach the master unit 901A.
　また、他の親機９０１Ｂからデータ取得の要求が子機９０２ａに出される場合もあり、図７（ｂ）に示すように、需要家９９４ａで取得したデータ信号（需要家情報）が、中継器（子機９０２ｂ、子機９０２ｄ、子機９０２ｅ等）を中継して、親機９０１Ｂに到達する。なお、各親機９０１は、１つの子機９０２のみばかりでなく、他の複数の子機９０２の需要家情報を収集している。 In addition, a data acquisition request may be issued from the other parent device 901B to the child device 902a. As shown in FIG. 7B, the data signal (customer information) acquired by the customer 994a is transferred to the repeater. (Slave unit 902b, slave unit 902d, slave unit 902e, etc.) are relayed to reach the master unit 901B. Each parent device 901 collects customer information not only for one child device 902 but also for a plurality of other child devices 902.
特開２０１４－７２７３３号公報JP 2014-72733 A
　しかしながら、従来例のような需要家９９４（家庭）で電源の確保が充分な場所に子機９０２がある場合と違い、太陽光発電や振動発電等のエナジーハーベスト（環境発電）の電源で動作する子機を有する場合、データの取得やデータの送信のための電力を最小限に抑える通信システムしなければいけなかった。このため、従来例のように子機に常に電力を供給して受信状態や待ち受け状態にすることはできなく、親機からのデータ取得の要求を受信できないばかりか、子機からのハローメッセージ（確認信号）を定期的に送信できないので、確かな通信ルートの構築もできないという課題があった。 However, unlike the case of the customer 994 (home) as in the conventional example, where there is a handset 902 in a place where the power supply is sufficiently secured, it operates with an energy harvest (environmental power generation) power source such as solar power generation or vibration power generation. In the case of having a slave unit, a communication system that minimizes the power for data acquisition and data transmission has to be provided. For this reason, as in the conventional example, it is not possible to always supply power to the slave unit to enter the reception state or standby state and not only receive the data acquisition request from the master unit, but also the hello message from the slave unit ( (Confirmation signal) cannot be transmitted periodically, and there is a problem that a reliable communication route cannot be constructed.
　また、子機が消費する電力を抑える方法として、子機はデータを取得したときのみにデータを発信して、通常はスリープ状態（電源オフ或いは最小限の電力での稼働）としておくという方法が考えられる。しかしながら、中継器を介した親機と子機とが互いに認識（同期）できないので、同様に通信経路（通信ルート）が確立できず、子機から親機への通信経路が数多く存在することとなる。このため、トラフィック（通行量）が増大し、親機（中継器も含む）にかかる負担が大きくなってしまうという課題もあった。 Also, as a method of suppressing the power consumed by the slave unit, the slave unit transmits data only when data is acquired, and is normally in a sleep state (power off or operation with minimum power). Conceivable. However, since the parent device and the child device via the repeater cannot recognize (synchronize) each other, the communication path (communication route) cannot be established in the same way, and there are many communication routes from the child device to the parent device. Become. For this reason, there is a problem that traffic (traffic volume) increases and a burden on the parent device (including a repeater) increases.
　本発明は、上述した課題を解決するもので、電力の供給が少ない子機であっても子機から親機への通信が安定して行えるマルチホップ無線通信システムを提供することを目的とする。 An object of the present invention is to solve the above-described problems, and to provide a multi-hop wireless communication system that can stably perform communication from a child device to the parent device even if the child device has a small amount of power supply. .
　この課題を解決するために、本発明のマルチホップ無線通信システムは、データを含んだデータ信号を電波で送信する子機送信部を有する子機と、前記データ信号を受信する中継受信部と前記データ信号を外部に前記電波で送信する中継送信部とを有する中継器と、前記中継器からの前記データ信号を受信する親機受信部を有する親機と、を備えたマルチホップ通信システムにおいて、前記親機が、自身を特定する親機識別情報と前記データ信号の取得のためのデータ送信要求信号とを含んだ第１情報信号を外部に前記電波で送信する親機送信部と、該親機送信部及び前記親機受信部を制御する親機制御部と、を有し、前記中継器が、前記中継受信部及び前記中継送信部を制御する中継制御部と、前記子機からの前記データ信号を記憶する記憶部と、を有し、前記子機が、太陽光発電や振動発電等の環境発電からの電力を用いて、自身を特定する子機識別情報を含んだ第２情報信号と前記データ信号とを送信し、前記中継器が、前記子機からの当該第２情報信号及び当該データ信号を受信するとともに前記記憶部に記憶し、前記中継器が、前記親機からの前記データ送信要求信号に基づき、記憶された前記データ信号を予め決められた送信経路に従って送信することを特徴としている。 In order to solve this problem, the multi-hop wireless communication system of the present invention includes a slave unit having a slave unit transmitting unit that transmits a data signal including data by radio waves, a relay receiving unit that receives the data signal, In a multi-hop communication system comprising: a repeater having a relay transmission unit that transmits a data signal to the outside by the radio wave; and a master unit having a master unit reception unit that receives the data signal from the repeater. A base unit transmitting unit for transmitting a first information signal including the base unit identification information for identifying itself and a data transmission request signal for acquiring the data signal to the outside by the radio wave; A base unit control unit that controls the base unit transmission unit and the base unit reception unit, and the relay unit, the relay control unit that controls the relay reception unit and the relay transmission unit, and the slave unit Store data signal A second information signal including slave unit identification information for identifying the slave unit using power from environmental power generation such as solar power generation or vibration power generation, and the data signal. The repeater receives the second information signal and the data signal from the slave unit and stores them in the storage unit, and the repeater receives the data transmission request signal from the master unit. Based on this, the stored data signal is transmitted along a predetermined transmission path.
　これによれば、本発明のマルチホップ無線通信システムは、子機がデータを取得しデータ信号を送信するのみなので、データの取得やデータの送信のための子機が消費する環境発電の電力を最小限に抑えることができる。一方、中継器が記憶されたデータ信号を予め決められた送信経路に従って送信するので、子機から中継器を介して親機まで、データ信号を確実に送信することができる。これらのことにより、電力の供給が少ない子機であっても、子機から親機への送信を安定して行うことができる。 According to this, in the multi-hop wireless communication system of the present invention, since the slave unit only acquires data and transmits a data signal, the power of energy harvesting consumed by the slave unit for data acquisition and data transmission is reduced. Can be minimized. On the other hand, since the data signal stored in the repeater is transmitted according to a predetermined transmission path, the data signal can be reliably transmitted from the slave unit to the master unit via the repeater. As a result, even a slave unit with little power supply can stably transmit data from the slave unit to the master unit.
　また、本発明のマルチホップ無線通信システムは、前記中継器の前記中継制御部が、前記第１情報信号の受信信号強度を判断することにより、受信した前記第１情報信号に自身を特定する中継器識別情報を加えるとともに、前記親機識別情報及び前記中継器識別情報の順番履歴も加えて、前記第１情報信号を送信し、前記親機制御部が、前記中継器の内、所定の前記子機から直接送信された前記データ信号を記憶している前記中継器を末端中継器とし、前記親機から該末端中継器までの前記順番履歴の逆経路を、所定の前記子機における前記データ信号の送信経路として確定することを特徴としている。 In the multi-hop wireless communication system according to the present invention, the relay control unit of the repeater determines the received signal strength of the first information signal to identify itself to the received first information signal. In addition to adding the device identification information, the master device identification information and the order history of the relay device identification information are also added, and the first information signal is transmitted. The repeater storing the data signal directly transmitted from the slave unit is used as a terminal repeater, and the reverse path of the order history from the master unit to the terminal repeater is changed to the data in the predetermined slave unit. It is characterized by being determined as a signal transmission path.
　これによれば、この送信経路に従い、子機から親機への送信を容易にかつ確実に行うことができる。 According to this, transmission from the slave unit to the master unit can be easily and reliably performed according to the transmission path.
　また、本発明のマルチホップ無線通信システムは、前記中継器の前記中継制御部が、前記第１情報信号の前記受信信号強度と対比する第１識別閾値を有し、該第１識別閾値以上の前記受信信号強度を受信した際に、前記第１情報信号を送信することを特徴としている。 In the multi-hop wireless communication system of the present invention, the relay control unit of the repeater has a first identification threshold value that is compared with the received signal strength of the first information signal, and is equal to or greater than the first identification threshold value. The first information signal is transmitted when the received signal strength is received.
　これによれば、各中継器同士の間及び中継器と親機との間の通信が確実に行われる。このことにより、末端中継器（中継器）から親機への通信をより安定して行なうことができる。 According to this, communication between each repeater and between the repeater and the master unit is reliably performed. As a result, communication from the terminal repeater (repeater) to the master unit can be performed more stably.
　また、本発明のマルチホップ無線通信システムは、前記中継器が前記第１識別閾値を異なった値で複数有していることを特徴としている。 The multi-hop wireless communication system of the present invention is characterized in that the repeater has a plurality of the first identification threshold values with different values.
　これによれば、マルチホップ無線通信システムが選択される環境に応じて、第１識別閾値を選択することができる。このことにより、環境に応じた最適な送信経路を確定することができ、子機から中継器を介して親機への通信をより一層安定して行なうことができる。 According to this, the first identification threshold can be selected according to the environment in which the multi-hop wireless communication system is selected. As a result, an optimum transmission path according to the environment can be determined, and communication from the slave unit to the master unit via the repeater can be performed more stably.
　また、本発明のマルチホップ無線通信システムは、前記中継器の前記中継制御部が、前記第２情報信号の前記受信信号強度と対比する第２識別閾値を有し、該第２識別閾値以上の前記受信信号強度を受信した際に、受信した前記第２情報信号を前記記憶部に記憶することを特徴としている。 In the multi-hop wireless communication system of the present invention, the relay control unit of the repeater has a second identification threshold value that is compared with the received signal strength of the second information signal, and is equal to or greater than the second identification threshold value. When the received signal strength is received, the received second information signal is stored in the storage unit.
　これによれば、子機から中継器への通信をより安定して行なうことができるとともに、中継器から親機にデータ信号を送信する送信経路を絞り込むことができる。これらのことにより、トラフィック（通行量）を抑制しつつ、子機から親機への通信をより安定して行うことができる。 According to this, communication from the slave unit to the repeater can be performed more stably, and the transmission path for transmitting the data signal from the repeater to the master unit can be narrowed down. By these things, communication from a subunit | mobile_unit to a main | base station can be performed more stably, suppressing traffic (traffic volume).
　また、本発明のマルチホップ無線通信システムは、前記中継器が前記第２識別閾値を異なった値で複数有していることを特徴としている。 The multi-hop wireless communication system of the present invention is characterized in that the repeater has a plurality of the second identification threshold values with different values.
　これによれば、マルチホップ無線通信システムが選択される環境に応じて、第２識別閾値を選択することができる。このことにより、環境に応じた最適な送信経路を確定することができ、子機から中継器を介して親機への通信をより一層安定して行なうことができる。 According to this, the second identification threshold can be selected according to the environment in which the multi-hop wireless communication system is selected. As a result, an optimum transmission path according to the environment can be determined, and communication from the slave unit to the master unit via the repeater can be performed more stably.
　また、本発明のマルチホップ無線通信システムは、前記親機制御部が、所定の前記子機の前記データ信号を記憶している前記末端中継器の内、前記第２情報信号の前記受信信号強度が最も高い前記末端中継器を、所定の前記子機における指定末端中継器とすることを特徴としている。 Further, in the multi-hop wireless communication system of the present invention, the received signal strength of the second information signal in the terminal repeater in which the parent device control unit stores the data signal of the predetermined child device. The terminal repeater having the highest value is a designated terminal repeater in the predetermined slave unit.
　これによれば、子機から指定末端中継器（中継器）への送信を安定して行うことができ、この指定末端中継器（中継器）を含んだ送信経路で子機から親機への通信をより一層安定して行うことができる。また、１つの子機からのデータ信号の送信経路を１つに絞ったので、トラフィック（通行量）を大幅に抑制することができる。 According to this, the transmission from the slave unit to the designated terminal repeater (repeater) can be stably performed, and the slave unit to the master unit through the transmission path including the designated terminal repeater (repeater). Communication can be performed more stably. Further, since the transmission path of the data signal from one slave unit is narrowed down to one, traffic (traffic volume) can be greatly suppressed.
　また、本発明のマルチホップ無線通信システムは、前記親機制御部が、所定のタイミングで前記第１情報信号を送信し、前記中継制御部が直近の前記第１情報信号の前記受信信号強度を判断し、この判断に基づいて、直近の前記送信経路を確定することを特徴としている。 In the multi-hop wireless communication system of the present invention, the base unit control unit transmits the first information signal at a predetermined timing, and the relay control unit determines the received signal strength of the most recent first information signal. It is characterized in that the latest transmission path is determined based on the determination.
　これによれば、通信経路の間で何らかの外的要因が生じて受信信号強度が弱められた状態が継続されたとしても、所定のタイミングで、受信信号強度が直近で最も強い送信経路を構築することができる。このことにより、子機から中継器を介して親機への通信をより安定して行なうことができる。 According to this, even if a state in which the received signal strength is weakened due to some external factor occurring between the communication paths, the strongest transmission path with the latest received signal strength is constructed at a predetermined timing. be able to. As a result, communication from the slave unit to the master unit via the repeater can be performed more stably.
　本発明のマルチホップ無線通信システムは、子機がデータを取得しデータ信号を送信するのみなので、データの取得やデータの送信のための子機が消費する環境発電の電力を最小限に抑えることができる。一方、中継器が記憶されたデータ信号を予め決められた送信経路に従って送信するので、子機から中継器を介して親機まで、データ信号を確実に送信することができる。これらのことにより、電力の供給が少ない子機であっても、子機から親機への送信を安定して行うことができる。 In the multi-hop wireless communication system of the present invention, since the slave unit only acquires data and transmits a data signal, the power of the energy harvesting consumed by the slave unit for data acquisition and data transmission is minimized. Can do. On the other hand, since the data signal stored in the repeater is transmitted according to a predetermined transmission path, the data signal can be reliably transmitted from the slave unit to the master unit via the repeater. As a result, even a slave unit with little power supply can stably transmit data from the slave unit to the master unit.
本発明の第１実施形態に係わるマルチホップ無線通信システムの構成の概要を示した説明図である。It is explanatory drawing which showed the outline | summary of the structure of the multihop radio | wireless communications system concerning 1st Embodiment of this invention. 本発明の第１実施形態に係わるマルチホップ無線通信システムの構成を示した機能ブロック図である。It is the functional block diagram which showed the structure of the multihop radio | wireless communications system concerning 1st Embodiment of this invention. 本発明の第１実施形態に係わるマルチホップ無線通信システムの手順を説明する図であって、第１情報信号の伝達方法を示すフローチャートＡ図である。It is a figure explaining the procedure of the multihop radio | wireless communications system concerning 1st Embodiment of this invention, Comprising: It is the flowchart A figure which shows the transmission method of a 1st information signal. 本発明の第１実施形態に係わるマルチホップ無線通信システムの手順を説明する図であって、第２情報信号の伝達方法を示すフローチャートＢ図である。It is a figure explaining the procedure of the multihop radio | wireless communications system concerning 1st Embodiment of this invention, Comprising: It is the flowchart B figure which shows the transmission method of a 2nd information signal. 本発明の第１実施形態に係わるマルチホップ無線通信システムの手順を説明する図であって、送信経路の確定方法を示すフローチャートＣ図である。It is a figure explaining the procedure of the multihop radio | wireless communications system concerning 1st Embodiment of this invention, Comprising: It is the flowchart C which shows the determination method of a transmission path | route. 本発明の第１実施形態に係わるマルチホップ無線通信システムの手順を説明する図であって、データ信号の送受信方法のフローチャートＤ図である。It is a figure explaining the procedure of the multihop radio | wireless communications system concerning 1st Embodiment of this invention, Comprising: It is the flowchart D figure of the transmission / reception method of a data signal. 従来例のマルチホップ無線通信装置の構成を示すブロック図である。It is a block diagram which shows the structure of the multihop radio | wireless communication apparatus of a prior art example.
　以下、本発明の実施の形態について図面を参照して説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
　［第１実施形態］
　図１は、本発明の第１実施形態に係わるマルチホップ無線通信システム１０１の構成を示した説明図である。図２は、本発明の第１実施形態に係わるマルチホップ無線通信システム１０１の構成を示したブロック図である。 [First Embodiment]
FIG. 1 is an explanatory diagram showing the configuration of a multi-hop wireless communication system 101 according to the first embodiment of the present invention. FIG. 2 is a block diagram showing a configuration of the multi-hop wireless communication system 101 according to the first embodiment of the present invention.
　本発明の第１実施形態のマルチホップ無線通信システム１０１は、図１に示すように、データを含んだデータ信号ＤＳを電波で送信する子機Ａ１と、データ信号ＤＳを送受信する複数の中継器Ｒ５（Ｒ５１～Ｒ５９）と、中継器Ｒ５からのデータ信号ＤＳを受信する親機Ｚ９と、を備えて構成されている。他に、マルチホップ無線通信システム１０１では、子機Ａ１、中継器Ｒ５及び親機Ｚ９の全てにおいて、図１に示すように、電波を送受信するためのアンテナＡＴを備えている。なお、アンテナＡＴに関しては、一般的な線状アンテナ、ループ・アンテナ、平面アンテナ等、様々なタイプのアンテナを用いることができ、本発明の要旨を限定するものではないので、詳細な説明は省略する。 As shown in FIG. 1, a multi-hop wireless communication system 101 according to the first embodiment of the present invention includes a slave unit A1 that transmits a data signal DS including data by radio waves, and a plurality of repeaters that transmit and receive the data signal DS. R5 (R51 to R59) and a master unit Z9 that receives the data signal DS from the repeater R5. In addition, in the multi-hop wireless communication system 101, all of the slave unit A1, the repeater R5, and the master unit Z9 are provided with an antenna AT for transmitting and receiving radio waves as shown in FIG. Regarding the antenna AT, various types of antennas such as a general linear antenna, a loop antenna, and a planar antenna can be used, and the gist of the present invention is not limited. To do.
　そして、マルチホップ無線通信システム１０１は、例えば計測器や測定器等のデータソース５００で得られたデータをデータ信号ＤＳに変換して、データソース５００に接続された子機Ａ１からアンテナＡＴを介し電波で放射し、更に中継器Ｒ５を介してデータ信号ＤＳを伝搬させ、親機Ｚ９にまでデータ信号ＤＳを送信し、データを通信させるシステムである。 Then, the multi-hop wireless communication system 101 converts, for example, data obtained by the data source 500 such as a measuring instrument or a measuring instrument into a data signal DS, and transmits the data from the slave unit A1 connected to the data source 500 via the antenna AT. This is a system that radiates with radio waves, further propagates the data signal DS via the repeater R5, transmits the data signal DS to the master unit Z9, and communicates the data.
　先ず、マルチホップ無線通信システム１０１の子機Ａ１について説明する。子機Ａ１は、図２に示すように、太陽光発電や振動発電等の環境発電を行う発電器ＥＮ１と、データ信号ＤＳを送信する子機送信部１１と、子機送信部１１を制御する子機制御部５１と、電波を送信するためのアンテナＡＴと、を有して構成されている。 First, the slave unit A1 of the multi-hop wireless communication system 101 will be described. As shown in FIG. 2, the slave unit A1 controls the generator EN1 that performs environmental power generation such as solar power generation and vibration power generation, the slave unit transmission unit 11 that transmits the data signal DS, and the slave unit transmission unit 11. It has a slave unit control unit 51 and an antenna AT for transmitting radio waves.
　子機Ａ１の発電器ＥＮ１は、太陽光発電や振動発電等の環境発電（エナジーハーベスト、エネルギーハーベスト、エナジーハーベスティング、エネルギーハーベスティング等と呼称されている）を行う機器であって、所謂乾電池や蓄電器或いは電線から供給される電源を用いているものではない。つまり、太陽光や照明光、機械の発する振動、熱などのエネルギーを採取して電力を生成する機器である。特に、環境発電は、身の回りにある僅かなエネルギーを電力に変換する発電である。この発電器ＥＮ１は、子機送信部１１及び子機制御部５１に接続されて、自身が発電した際にのみ、電力を供給している。 The power generator EN1 of the child device A1 is a device that performs environmental power generation (referred to as energy harvesting, energy harvesting, energy harvesting, energy harvesting, etc.) such as solar power generation or vibration power generation. It does not use a power source supplied from a capacitor or an electric wire. In other words, it is a device that generates electric power by collecting energy such as sunlight, illumination light, vibration generated by a machine, and heat. In particular, energy harvesting is power generation that converts a small amount of energy around us into electric power. This power generator EN1 is connected to the handset transmitter 11 and handset control section 51, and supplies power only when it generates power.
　子機Ａ１の子機送信部１１は、信号処理回路及び送信回路を有して構成されており、データソース５００で得られたデータを含んだデジタル信号を信号処理回路でアナログ信号であるデータ信号ＤＳに変換している。そして、子機送信部１１は、発電器ＥＮ１からの電力を用いて、接続されたアンテナＡＴを介して、送信回路でデータ信号ＤＳを放射することにより、子機Ａ１の外部にデータ信号ＤＳを電波で送信している。 The slave unit transmission unit 11 of the slave unit A1 includes a signal processing circuit and a transmission circuit, and a digital signal including data obtained from the data source 500 is converted into an analog signal by the signal processing circuit. It is converted to DS. And the subunit | mobile_unit transmission part 11 radiates | emits the data signal DS outside the subunit | mobile_unit A1 by radiating | emitting the data signal DS in the transmission circuit via the connected antenna AT using the electric power from generator EN1. Transmitting with radio waves.
　また、子機送信部１１は、自身を特定する子機Ａ１の子機識別情報を含んだ信号（以下、第２情報信号ＩＤ２と云う）もデータ信号ＤＳと同時に送信している。 The slave unit transmission unit 11 also transmits a signal including the slave unit identification information of the slave unit A1 that identifies itself (hereinafter referred to as the second information signal ID2) simultaneously with the data signal DS.
　子機Ａ１の子機制御部５１は、集積回路（ＩＣ、integrated circuit）を用いて作製されており、子機送信部１１と接続されて、子機送信部１１の制御を行っている。 The child device control unit 51 of the child device A1 is manufactured using an integrated circuit (IC) and is connected to the child device transmission unit 11 to control the child device transmission unit 11.
　次に、マルチホップ無線通信システム１０１の中継器Ｒ５について説明する。中継器Ｒ５は、図２に示すように、データ信号ＤＳを送信する中継送信部１５と、データ信号ＤＳを受信する中継受信部３５と、中継送信部１５及び中継受信部３５を制御する中継制御部５５と、子機Ａ１からのデータ信号ＤＳを記憶する記憶部９５と、電波を送受信するためのアンテナＡＴと、を有して構成されている。 Next, the repeater R5 of the multi-hop wireless communication system 101 will be described. As shown in FIG. 2, the relay R5 includes a relay transmission unit 15 that transmits the data signal DS, a relay reception unit 35 that receives the data signal DS, and a relay control that controls the relay transmission unit 15 and the relay reception unit 35. Unit 55, storage unit 95 that stores data signal DS from slave unit A1, and antenna AT for transmitting and receiving radio waves.
　中継器Ｒ５の中継送信部１５は、増幅回路及び送信回路を有して構成されており、中継受信部３５で受信された子機Ａ１からのデータ信号ＤＳ或いは第２情報信号ＩＤ２を増幅回路で増幅し、接続されたアンテナＡＴを介して、送信回路でデータ信号ＤＳ或いは第２情報信号ＩＤ２を外部に電波で送信している。また、中継送信部１５は、中継受信部３５で受信された親機Ｚ９からの第１情報信号ＩＤ１（後述する）を増幅回路で増幅し、アンテナＡＴを介して、送信回路で外部に電波で送信している。 The relay transmitter 15 of the repeater R5 is configured to include an amplifier circuit and a transmitter circuit, and an amplifier circuit receives the data signal DS or the second information signal ID2 from the slave unit A1 received by the relay receiver 35. The data signal DS or the second information signal ID2 is transmitted to the outside by radio waves in the transmission circuit via the antenna AT that is amplified and connected. Further, the relay transmission unit 15 amplifies a first information signal ID1 (described later) received from the base unit Z9 received by the relay reception unit 35 by an amplifier circuit, and externally transmits a radio wave by the transmission circuit via the antenna AT. Sending.
　また、中継送信部１５は、自身を特定する中継器Ｒ５の中継器識別情報を第１情報信号ＩＤ１及び第２情報信号ＩＤ２に加えて同時に送信している。 In addition, the relay transmission unit 15 transmits the relay identification information of the relay R5 that identifies itself to the first information signal ID1 and the second information signal ID2 at the same time.
　中継器Ｒ５の中継受信部３５は、受信回路を有して構成されており、子機Ａ１から或いは中継器Ｒ５を介して伝搬してきたデータ信号ＤＳ及び第２情報信号ＩＤ２と、親機Ｚ９から或いは中継器Ｒ５を介して伝搬してきた第１情報信号ＩＤ１と、を受信回路で受信して中継送信部１５に送信している。 The relay receiving unit 35 of the repeater R5 is configured to include a receiving circuit, and includes the data signal DS and the second information signal ID2 propagated from the slave unit A1 or via the repeater R5, and the master unit Z9. Alternatively, the first information signal ID1 propagated through the relay R5 is received by the receiving circuit and transmitted to the relay transmitting unit 15.
　また、中継受信部３５は、強度表示回路を有して構成されており、受信した第１情報信号ＩＤ１の受信信号強度（ＲＳＳＩ）を算出し、中継制御部５５に送信している。また、中継受信部３５は、受信したデータ信号ＤＳ及び第２情報信号ＩＤ２の受信信号強度（ＲＳＳＩ）を算出し、中継制御部５５に送信している。 Further, the relay receiving unit 35 is configured to have an intensity display circuit, and calculates the received signal strength (RSSI) of the received first information signal ID1 and transmits it to the relay control unit 55. Further, the relay receiving unit 35 calculates the received signal strength (RSSI) of the received data signal DS and the second information signal ID2, and transmits the calculated signal strength to the relay control unit 55.
　中継器Ｒ５の中継制御部５５は、中継送信部１５及び中継受信部３５と接続しており、中継送信部１５及び中継受信部３５の制御をしている。また、中継制御部５５は、第１情報信号ＩＤ１の受信信号強度（ＲＳＳＩ）と所定の値である識別閾値（後述する第１閾値）とを比較したり、データ信号ＤＳの受信信号強度（ＲＳＳＩ）と所定の値であるデータ閾値（後述する第２閾値）とを比較したり、第１情報信号ＩＤ１に含まれる中継器識別情報や第２情報信号ＩＤ２に含まれる子機識別情報等の情報を取り出したりしている。 The relay control unit 55 of the repeater R5 is connected to the relay transmission unit 15 and the relay reception unit 35, and controls the relay transmission unit 15 and the relay reception unit 35. Further, the relay control unit 55 compares the received signal strength (RSSI) of the first information signal ID1 with an identification threshold value (first threshold value described later) which is a predetermined value, or receives the received signal strength (RSSI) of the data signal DS. ) And a data threshold value (second threshold value to be described later) which is a predetermined value, information such as repeater identification information included in the first information signal ID1 and slave unit identification information included in the second information signal ID2 Or take out.
　中継器Ｒ５の記憶部９５は、メモリ等の内部記憶装置やメモリカード等の外部記憶装置等を用いており、子機Ａ１からのデータ信号ＤＳを記憶するとともに、中継器識別情報を含んだ第１情報信号ＩＤ１や子機識別情報を含んだ第２情報信号ＩＤ２等の情報を保存している。また、記憶部９５は、所定の値である識別閾値等を格納している。 The storage unit 95 of the repeater R5 uses an internal storage device such as a memory or an external storage device such as a memory card. The storage unit 95 stores the data signal DS from the slave unit A1 and includes repeater identification information. Information, such as 1 information signal ID1 and 2nd information signal ID2 containing subunit | mobile_unit identification information, is preserve | saved. The storage unit 95 stores an identification threshold value that is a predetermined value.
　最後に、マルチホップ無線通信システム１０１の親機Ｚ９について説明する。親機Ｚ９は、図２に示すように、データ信号ＤＳの取得のためのデータ送信要求信号ＲＳを含んだ第１情報信号ＩＤ１を送信する親機送信部１９と、中継器Ｒ５からのデータ信号ＤＳを受信する親機受信部３９と、親機送信部１９及び親機受信部３９を制御する親機制御部５９と、所定の値等を格納する記録部９９と、電波を送受信するためのアンテナＡＴと、を有して構成されている。 Finally, the master unit Z9 of the multi-hop wireless communication system 101 will be described. As shown in FIG. 2, the master unit Z9 includes a master unit transmission unit 19 that transmits a first information signal ID1 including a data transmission request signal RS for obtaining the data signal DS, and a data signal from the repeater R5. A base unit receiving unit 39 for receiving a DS, a base unit controlling unit 59 for controlling the base unit transmitting unit 19 and the base unit receiving unit 39, a recording unit 99 for storing predetermined values, etc., for transmitting and receiving radio waves And an antenna AT.
　親機Ｚ９の親機送信部１９は、送信回路を有して構成されており、データ信号ＤＳの取得のためのデータ送信要求信号ＲＳを含んだ第１情報信号ＩＤ１を、接続されたアンテナＡＴを介して、送信回路で第１情報信号ＩＤ１を放射することにより、親機Ｚ９の外部に第１情報信号ＩＤ１を電波で送信している。 The base unit transmission unit 19 of the base unit Z9 is configured to include a transmission circuit, and receives the first information signal ID1 including the data transmission request signal RS for obtaining the data signal DS from the connected antenna AT. The first information signal ID1 is transmitted by radio waves to the outside of the master unit Z9 by radiating the first information signal ID1 by the transmission circuit via the.
　また、親機送信部１９は、自身を特定する親機Ｚ９の親機識別情報を第１情報信号ＩＤ１に加えて同時に送信している。 In addition, the parent device transmission unit 19 simultaneously transmits the parent device identification information of the parent device Z9 that identifies itself to the first information signal ID1.
　親機Ｚ９の親機受信部３９は、受信回路及び信号処理回路を有して構成されており、中継器Ｒ５を介して伝搬してきたデータ信号ＤＳ及び第２情報信号ＩＤ２を受信回路で受信し、信号処理回路でデジタル信号に変換して親機制御部５９に送信している。 The base unit receiving unit 39 of the base unit Z9 is configured to include a receiving circuit and a signal processing circuit, and the receiving circuit receives the data signal DS and the second information signal ID2 propagated through the repeater R5. The digital signal is converted into a digital signal by the signal processing circuit and transmitted to the parent device control unit 59.
　親機Ｚ９の親機制御部５９は、親機送信部１９及び親機受信部３９と接続しており、親機送信部１９及び親機受信部３９を制御している。また、親機制御部５９は、親機受信部３９でデジタル信号に変換されたデータソース５００のデータを記録部９９に保存したり、中継器Ｒ５を介して伝搬してきたデータ信号ＤＳの保存や第２情報信号ＩＤ２に含まれる子機識別情報や中継器識別情報等の情報を取り出したりしている。 The parent device control unit 59 of the parent device Z9 is connected to the parent device transmission unit 19 and the parent device reception unit 39, and controls the parent device transmission unit 19 and the parent device reception unit 39. The base unit control unit 59 stores the data of the data source 500 converted into a digital signal by the base unit receiving unit 39 in the recording unit 99, stores the data signal DS propagated through the repeater R5, Information such as handset identification information and repeater identification information included in the second information signal ID2 is extracted.
　また、親機制御部５９は、親機送信部１９が所定のタイミングで第１情報信号ＩＤ１を送信するように、制御している。なお、ここでいう所定のタイミングとは、一定時間が経過したタイミングや、データ信号ＤＳを一定回数受信したタイミング等を示している。なお、親機Ｚ９は、有線で接続された外部機器に受信したデータを送信している。 Further, the parent device control unit 59 controls the parent device transmission unit 19 to transmit the first information signal ID1 at a predetermined timing. Here, the predetermined timing indicates a timing at which a certain time has elapsed, a timing at which the data signal DS is received a certain number of times, or the like. The master unit Z9 transmits the received data to an external device connected by wire.
　親機Ｚ９の記録部９９は、前述したように、データソース５００のデータを記録したり、所定の値等が格納されている。 As described above, the recording unit 99 of the master unit Z9 records data of the data source 500 and stores predetermined values and the like.
　次に、マルチホップ無線通信システム１０１の手順の一例について説明する。先ず、マルチホップ無線通信システム１０１における、第１情報信号ＩＤ１及び第２情報信号ＩＤ２の伝達方法について、図１、図３及び図４を用いて説明する。図３は、マルチホップ無線通信システム１０１の手順を説明する図であって、第１情報信号ＩＤ１の伝達方法を示すフローチャートＡ図である。図４は、マルチホップ無線通信システム１０１の手順を説明する図であって、第２情報信号ＩＤ２の伝達方法を示すフローチャートＢ図である。 Next, an example of the procedure of the multi-hop wireless communication system 101 will be described. First, a transmission method of the first information signal ID1 and the second information signal ID2 in the multi-hop wireless communication system 101 will be described with reference to FIG. 1, FIG. 3, and FIG. FIG. 3 is a flowchart for explaining the procedure of the multi-hop wireless communication system 101, and is a flowchart A showing a transmission method of the first information signal ID1. FIG. 4 is a flowchart illustrating the procedure of the multi-hop wireless communication system 101, and is a flowchart B illustrating a method for transmitting the second information signal ID2.
　先ず、親機Ｚ９から発信される第１情報信号ＩＤ１の伝達方法について説明する。親機Ｚ９は、図３に示すように、第１情報信号ＩＤ１を送信する所定のタイミングかどうかを判断する。そして、所定のタイミングの場合には、親機Ｚ９は、親機送信部１９から親機識別情報を含んだ第１情報信号ＩＤ１を送信する。この際に、この第１情報信号ＩＤ１の中に、データ信号ＤＳの取得のためのデータ送信要求信号ＲＳが含まれていても良い。 First, a transmission method of the first information signal ID1 transmitted from the parent device Z9 will be described. As shown in FIG. 3, base unit Z9 determines whether or not it is a predetermined timing for transmitting first information signal ID1. In the case of the predetermined timing, the base unit Z9 transmits the first information signal ID1 including the base unit identification information from the base unit transmission unit 19. At this time, the data transmission request signal RS for obtaining the data signal DS may be included in the first information signal ID1.
　次に、親機Ｚ９の近傍に配置された中継器Ｒ５、例えば図１に示す中継器Ｒ５１、中継器Ｒ５３及び中継器Ｒ５４が、送信されてきた第１情報信号ＩＤ１を中継受信部３５で受信し、中継制御部５５が第１情報信号ＩＤ１の受信信号強度（ＲＳＳＩ）が一定以上であるかどうかを判断する。具体的には、中継器Ｒ５の中継制御部５５は、第１情報信号ＩＤ１の受信信号強度（ＲＳＳＩ）と、記憶部９５に格納されていた第１識別閾値と、を比較して、受信信号強度（ＲＳＳＩ）が第１識別閾値以上であるかどうかを判断する。 Next, the repeater R5 arranged in the vicinity of the master unit Z9, for example, the repeater R51, the repeater R53, and the repeater R54 shown in FIG. 1 receives the transmitted first information signal ID1 by the relay receiving unit 35. Then, the relay control unit 55 determines whether or not the received signal strength (RSSI) of the first information signal ID1 is a certain level or more. Specifically, the relay control unit 55 of the repeater R5 compares the received signal strength (RSSI) of the first information signal ID1 with the first identification threshold value stored in the storage unit 95, and receives the received signal. It is determined whether the strength (RSSI) is greater than or equal to the first identification threshold.
　そして、図３に示すように、中継器Ｒ５（中継制御部５５）は、第１識別閾値以上の受信信号強度（ＲＳＳＩ）で第１情報信号ＩＤ１を受信した際には、この第１情報信号ＩＤ１を採用するようにしている。一方、中継器Ｒ５（中継制御部５５）は、第１識別閾値以下の受信信号強度（ＲＳＳＩ）で第１情報信号ＩＤ１を受信した際には、この受信信号強度（ＲＳＳＩ）の弱い信号を第１情報信号ＩＤ１として判断し、この第１情報信号ＩＤ１を採用しないようにしている。例えば、図１に示す親機Ｚ９に比較的近い中継器Ｒ５１及び中継器Ｒ５３は、ある第１識別閾値以上の受信信号強度（ＲＳＳＩ）で第１情報信号ＩＤ１を受信して、この第１情報信号ＩＤ１を採用し、親機Ｚ９から比較的遠い中継器Ｒ５４は、ある第１識別閾値以下の受信信号強度（ＲＳＳＩ）で第１情報信号ＩＤ１を受信するので、この第１情報信号ＩＤ１を採用しないこととなる。 As shown in FIG. 3, when the repeater R5 (relay control unit 55) receives the first information signal ID1 with the received signal strength (RSSI) equal to or higher than the first identification threshold, the first information signal ID1 is adopted. On the other hand, when the repeater R5 (relay control unit 55) receives the first information signal ID1 with the received signal strength (RSSI) equal to or lower than the first identification threshold, the signal with the weak received signal strength (RSSI) is It is determined as one information signal ID1, and this first information signal ID1 is not adopted. For example, the repeater R51 and the repeater R53 that are relatively close to the base unit Z9 shown in FIG. 1 receive the first information signal ID1 with a received signal strength (RSSI) that is equal to or higher than a certain first identification threshold, and this first information The repeater R54 that employs the signal ID1 and is relatively far from the master unit Z9 receives the first information signal ID1 with a received signal strength (RSSI) that is equal to or less than a certain first identification threshold value, and therefore employs the first information signal ID1. Will not.
　なお、本発明の第１実施形態では、この第１識別閾値を異なった値で複数有しており、第１識別閾値の大小で受信した第１情報信号ＩＤ１の受信信号強度（ＲＳＳＩ）の強弱の差を区別でき、第１情報信号ＩＤ１の取捨を選択することができる。例えば、中継器Ｒ５１のみが第１情報信号ＩＤ１を選択できるようにしたり、中継器Ｒ５１、中継器Ｒ５３及び中継器Ｒ５４の全てが第１情報信号ＩＤ１を選択できるようにすることができる。これにより、マルチホップ無線通信システム１０１が選択される環境に応じて、第１識別閾値を選択して、環境に応じた最適な送信経路ＴＰを確定するために利用することができる。 In the first embodiment of the present invention, the first identification threshold value has a plurality of different values, and the strength of the received signal strength (RSSI) of the first information signal ID1 received with the magnitude of the first identification threshold value is different. Of the first information signal ID1 can be selected. For example, only the repeater R51 can select the first information signal ID1, or all of the repeaters R51, R53, and R54 can select the first information signal ID1. Thereby, according to the environment where the multihop radio | wireless communications system 101 is selected, a 1st identification threshold value can be selected and it can utilize in order to determine the optimal transmission path TP according to the environment.
　次に、中継器Ｒ５の中継制御部５５は、第１情報信号ＩＤ１の中に自身の中継器識別情報が含まれているかいないかを確認する。そして、第１情報信号ＩＤ１の中に自身の中継器識別情報が含まれていない場合、中継制御部５５は、この第１情報信号ＩＤ１を記憶部９５に保存するようにしている。一方、第１情報信号ＩＤ１の中に自身の中継器識別情報が含まれている場合、中継制御部５５は、この第１情報信号ＩＤ１を記憶部９５に保存せずに、破棄するようにしている。 Next, the relay control unit 55 of the repeater R5 confirms whether or not its own repeater identification information is included in the first information signal ID1. If the first information signal ID1 does not include its own repeater identification information, the relay control unit 55 stores the first information signal ID1 in the storage unit 95. On the other hand, when the first information signal ID1 includes its own repeater identification information, the relay control unit 55 discards the first information signal ID1 without storing it in the storage unit 95. Yes.
　次に、中継器Ｒ５の中継制御部５５は、図３に示すように、親機識別情報及び自らの中継器識別情報やその順番履歴も加えて、第１情報信号ＩＤ１を外部に中継送信部１５で送信する。例えば図１に示す中継器Ｒ５１及び中継器Ｒ５３は、ある第１識別閾値以上の受信信号強度（ＲＳＳＩ）を受信したので、親機Ｚ９から直接に受信した履歴に自身の中継器識別情報を加えて第１情報信号ＩＤ１とし、この第１情報信号ＩＤ１を外部に送信するようになる。 Next, as shown in FIG. 3, the relay control unit 55 of the repeater R5 adds the master unit identification information, its own repeater identification information, and its order history, and relays the first information signal ID1 to the outside. 15 for transmission. For example, since the repeater R51 and the repeater R53 shown in FIG. 1 have received a received signal strength (RSSI) that is equal to or higher than a first identification threshold value, the repeater identification information is added to the history directly received from the master unit Z9. Thus, the first information signal ID1 is transmitted to the outside.
　次に、第１情報信号ＩＤ１が送信された中継器Ｒ５の近傍に配置された中継器Ｒ５は、識別情報（親機識別情報及び中継器識別情報）と履歴情報が付加された第１情報信号ＩＤ１を中継受信部３５で受信し、中継制御部５５が第１情報信号ＩＤ１の受信信号強度（ＲＳＳＩ）が一定（第１識別閾値）以上であるかどうかを判断する。例えば図１に示す中継器Ｒ５１の近傍に配置された中継器Ｒ５は、中継器Ｒ５２、中継器Ｒ５３及び中継器Ｒ５５であり、中継器Ｒ５２、中継器Ｒ５３及び中継器Ｒ５５のそれぞれは、第１情報信号ＩＤ１を受信し、第１情報信号ＩＤ１の受信信号強度（ＲＳＳＩ）が一定（第１識別閾値）以上であるかどうかを判断するようになる。例えば図１に示す中継器Ｒ５３の近傍に配置された中継器Ｒ５は、中継器Ｒ５１、中継器Ｒ５４及び中継器Ｒ５６となり、中継器Ｒ５１、中継器Ｒ５４及び中継器Ｒ５６のそれぞれは、第１情報信号ＩＤ１を受信し、第１情報信号ＩＤ１の受信信号強度（ＲＳＳＩ）が一定（第１識別閾値）以上であるかどうかを判断するようになる。 Next, the repeater R5 arranged in the vicinity of the repeater R5 to which the first information signal ID1 is transmitted is the first information signal to which the identification information (master unit identification information and repeater identification information) and history information are added. ID1 is received by the relay receiving unit 35, and the relay control unit 55 determines whether or not the received signal strength (RSSI) of the first information signal ID1 is greater than or equal to a certain value (first identification threshold). For example, the repeater R5 arranged in the vicinity of the repeater R51 shown in FIG. 1 is the repeater R52, the repeater R53, and the repeater R55. Each of the repeater R52, the repeater R53, and the repeater R55 is the first repeater. The information signal ID1 is received, and it is determined whether or not the received signal strength (RSSI) of the first information signal ID1 is greater than or equal to a certain value (first identification threshold). For example, the relay R5 arranged in the vicinity of the relay R53 shown in FIG. 1 becomes the relay R51, the relay R54, and the relay R56, and each of the relay R51, the relay R54, and the relay R56 includes the first information. The signal ID1 is received, and it is determined whether or not the received signal strength (RSSI) of the first information signal ID1 is greater than or equal to a certain value (first identification threshold).
　そして、同様にして、第１情報信号ＩＤ１が送信された中継器Ｒ５の近傍に配置されたそれぞれの中継器Ｒ５（中継制御部５５）は、第１識別閾値以上の受信信号強度（ＲＳＳＩ）を受信した際には、この第１情報信号ＩＤ１を採用し、第１情報信号ＩＤ１の中に自身の中継器識別情報が含まれていない場合は、第１情報信号ＩＤ１を記憶部９５に保存する。一方、それぞれの中継器Ｒ５（中継制御部５５）は、第１識別閾値以下の受信信号強度（ＲＳＳＩ）を受信した際には、この受信信号強度（ＲＳＳＩ）の弱い第１情報信号ＩＤ１として判断し、この第１情報信号ＩＤ１を採用せずに破棄する。 Similarly, each relay R5 (relay control unit 55) arranged in the vicinity of the relay R5 to which the first information signal ID1 is transmitted has a received signal strength (RSSI) equal to or higher than the first identification threshold. When received, the first information signal ID1 is adopted, and when the first information signal ID1 does not include its own repeater identification information, the first information signal ID1 is stored in the storage unit 95. . On the other hand, when each of the repeaters R5 (relay control unit 55) receives a received signal strength (RSSI) that is equal to or lower than the first identification threshold, the repeater R5 (relay controller 55) determines that the received information strength (RSSI) is weak as the first information signal ID1. The first information signal ID1 is discarded without being adopted.
　次に、ある第１識別閾値以上の受信信号強度（ＲＳＳＩ）で第１情報信号ＩＤ１を受信した中継器Ｒ５は、それまでの履歴（履歴情報）に自らの中継器識別情報を加えて、刷新した第１情報信号ＩＤ１を外部に中継送信部１５で送信する。このような手順を各中継器Ｒ５が行い、親機Ｚ９からの第１情報信号ＩＤ１が中継器Ｒ５間を伝搬するようになる。そして、図３に示すように、中継器Ｒ５が受信した第１情報信号ＩＤ１の中に自身の中継器識別情報が含まれている場合は、中継器Ｒ５（中継制御部５５）は、この第１情報信号ＩＤ１を記憶部９５に保存しないとともに、この第１情報信号ＩＤ１を外部に送信しないで終了する。 Next, the repeater R5 that has received the first information signal ID1 with a received signal strength (RSSI) equal to or higher than a certain first identification threshold adds its own repeater identification information to the previous history (history information) and renews it. The first information signal ID1 is transmitted to the outside by the relay transmission unit 15. Each repeater R5 performs such a procedure, and the first information signal ID1 from the master unit Z9 propagates between the repeaters R5. As shown in FIG. 3, when the repeater identification information is included in the first information signal ID1 received by the repeater R5, the repeater R5 (relay control unit 55) 1 information signal ID1 is not preserve | saved in the memory | storage part 95, and it complete | finishes, without transmitting this 1st information signal ID1 outside.
　次に、子機Ａ１から発信される第２情報信号ＩＤ２の伝達方法について説明する。第２情報信号ＩＤ２の伝達方法は、図４に示すように、データ信号ＤＳの伝達方法に従って伝達するようになっている。 Next, a method for transmitting the second information signal ID2 transmitted from the child device A1 will be described. As shown in FIG. 4, the transmission method of the second information signal ID2 is transmitted in accordance with the transmission method of the data signal DS.
　先ず、図４に示すように、子機Ａ１が環境発電からの電力を得てデータ信号ＤＳを送信する際に、子機Ａ１は、自身を特定する子機Ａ１の子機識別情報を含んだ第２情報信号ＩＤ２を子機送信部１１で送信する。 First, as shown in FIG. 4, when the slave unit A1 obtains power from the energy harvesting and transmits the data signal DS, the slave unit A1 includes the slave unit identification information of the slave unit A1 that identifies itself. 2nd information signal ID2 is transmitted in the subunit | mobile_unit transmission part 11. FIG.
　次に、子機Ａ１の近傍に配置された中継器Ｒ５、例えば図１に示す中継器Ｒ５６、中継器Ｒ５８及び中継器Ｒ５９が、送信されてきたデータ信号ＤＳ（第２情報信号ＩＤ２も含む）を中継受信部３５で受信し、中継制御部５５が第２情報信号ＩＤ２の受信信号強度（ＲＳＳＩ）が一定以上であるかどうかを判断する。具体的には、中継器Ｒ５の中継制御部５５は、第２情報信号ＩＤ２の受信信号強度（ＲＳＳＩ）と、記憶部９５に格納されていた第２識別閾値と、を比較して、受信信号強度（ＲＳＳＩ）が第２識別閾値以上であるかどうかを判断する。 Next, the repeater R5 arranged in the vicinity of the slave unit A1, for example, the repeater R56, the repeater R58, and the repeater R59 shown in FIG. 1, transmits the transmitted data signal DS (including the second information signal ID2). Is received by the relay receiving unit 35, and the relay control unit 55 determines whether or not the received signal strength (RSSI) of the second information signal ID2 is greater than or equal to a certain value. Specifically, the relay control unit 55 of the repeater R5 compares the received signal strength (RSSI) of the second information signal ID2 with the second identification threshold value stored in the storage unit 95, and receives the received signal. It is determined whether the strength (RSSI) is greater than or equal to the second identification threshold.
　そして、図４に示すように、中継器Ｒ５（中継制御部５５）は、第２識別閾値以上の受信信号強度（ＲＳＳＩ）で第２情報信号ＩＤ２を受信した際には、この第２情報信号ＩＤ２を採用するようにしている。一方、中継器Ｒ５（中継制御部５５）は、第２識別閾値以下の受信信号強度（ＲＳＳＩ）で第２情報信号ＩＤ２を受信した際には、この受信信号強度（ＲＳＳＩ）の弱い信号を第２情報信号ＩＤ２として判断し、この第２情報信号ＩＤ２を採用しないようにしている。例えば、図１に示す子機Ａ１に比較的近い中継器Ｒ５８及び中継器Ｒ５９は、ある第２識別閾値以上の受信信号強度（ＲＳＳＩ）で第２情報信号ＩＤ２を受信して、この第２情報信号ＩＤ２を採用し、親機Ｚ９から比較的遠い中継器Ｒ５６は、ある第２識別閾値以下の受信信号強度（ＲＳＳＩ）で第２情報信号ＩＤ２を受信するので、この第２情報信号ＩＤ２を採用しないこととなる。 As shown in FIG. 4, when the repeater R5 (relay controller 55) receives the second information signal ID2 with a received signal strength (RSSI) equal to or higher than the second identification threshold, the second information signal ID2 is adopted. On the other hand, when the repeater R5 (relay control unit 55) receives the second information signal ID2 with the received signal strength (RSSI) equal to or lower than the second identification threshold, the repeater R5 (relay control unit 55) The second information signal ID2 is determined, and the second information signal ID2 is not adopted. For example, the repeater R58 and the repeater R59 that are relatively close to the child device A1 shown in FIG. 1 receive the second information signal ID2 with a received signal strength (RSSI) that is equal to or higher than a certain second identification threshold, and this second information The repeater R56 that employs the signal ID2 and is relatively far from the master unit Z9 receives the second information signal ID2 with a received signal strength (RSSI) that is less than or equal to a second identification threshold, and therefore employs the second information signal ID2. Will not.
　なお、本発明の第１実施形態では、この第２識別閾値も第１識別値と同様に、異なった値で複数有しており、第２識別閾値の大小で受信した第２情報信号ＩＤ２の受信信号強度（ＲＳＳＩ）の強弱の差を区別でき、第２情報信号ＩＤ２の取捨を選択することができる。例えば、中継器Ｒ５９のみが第２情報信号ＩＤ２を選択できるようにしたり、中継器Ｒ５６、中継器Ｒ５８及び中継器Ｒ５９の全てが第２情報信号ＩＤ２を選択できるようにすることができる。これにより、マルチホップ無線通信システム１０１が選択される環境に応じて、第２識別閾値を選択して、環境に応じた最適な送信経路ＴＰを確定するために利用することができる。 Note that, in the first embodiment of the present invention, the second identification threshold value has a plurality of different values as well as the first identification value, and the second information signal ID2 received with the magnitude of the second identification threshold value is different. The difference between the strengths of the received signal strengths (RSSI) can be distinguished, and the selection of the second information signal ID2 can be selected. For example, only the relay R59 can select the second information signal ID2, or all of the relay R56, the relay R58, and the relay R59 can select the second information signal ID2. Thereby, according to the environment where the multihop radio | wireless communications system 101 is selected, a 2nd identification threshold value can be selected and it can utilize in order to determine the optimal transmission path TP according to the environment.
　次に、中継器Ｒ５の中継制御部５５は、第２情報信号ＩＤ２の中に自身の中継器識別情報が含まれてるかいないかを確認する。そして、第２情報信号ＩＤ２の中に自身の中継器識別情報が含まれていない場合、中継制御部５５は、この第２情報信号ＩＤ２とデータ信号ＤＳを記憶部９５に保存する。一方、第２情報信号ＩＤ２の中に自身の中継器識別情報が含まれている場合、中継制御部５５は、この第２情報信号ＩＤ２を記憶部９５に保存せずに、破棄するようにしている。なお、図示はしていないが、この第２情報信号ＩＤ２とデータ信号ＤＳを記憶部９５に保存する際に、中継制御部５５は、第２情報信号ＩＤ２を確認し、他の中継器Ｒ５を介さずに子機Ａ１から直接送信されて来た場合、この時の受信信号強度（ＲＳＳＩ）も記憶部９５に保存するようにしている。その際に、この中継器Ｒ５は、所定の子機Ａ１のデータ信号ＤＳを記憶している末端中継器として位置付けられる。 Next, the relay control unit 55 of the repeater R5 confirms whether or not its own repeater identification information is included in the second information signal ID2. If the second information signal ID2 does not include its own repeater identification information, the relay control unit 55 stores the second information signal ID2 and the data signal DS in the storage unit 95. On the other hand, if the second information signal ID2 includes its own repeater identification information, the relay control unit 55 discards the second information signal ID2 without storing it in the storage unit 95. Yes. Although not shown, when the second information signal ID2 and the data signal DS are stored in the storage unit 95, the relay control unit 55 confirms the second information signal ID2 and connects the other repeater R5. When it is transmitted directly from the child device A1 without going through, the received signal strength (RSSI) at this time is also stored in the storage unit 95. At this time, the repeater R5 is positioned as a terminal repeater that stores the data signal DS of the predetermined slave unit A1.
　次に、中継器Ｒ５の中継制御部５５は、図４に示すように、子機識別情報及び自らの中継器識別情報やその順番履歴も加えて、第２情報信号ＩＤ２を外部に中継送信部１５で送信する。例えば図１に示す中継器Ｒ５８及び中継器Ｒ５９は、ある第２識別閾値以上の受信信号強度（ＲＳＳＩ）で第２情報信号ＩＤ２を受信したので、子機Ａ１から直接に受信した履歴に自身の中継器識別情報を加えて第２情報信号ＩＤ２とし、この第２情報信号ＩＤ２を外部に送信するようになる。なお、第２情報信号ＩＤ２と同時にデータ信号ＤＳも送信するようにしても良い。 Next, as shown in FIG. 4, the relay control unit 55 of the repeater R5 adds the slave unit identification information, its own repeater identification information, and its order history, and relays the second information signal ID2 to the outside. 15 for transmission. For example, the repeater R58 and the repeater R59 shown in FIG. 1 have received the second information signal ID2 with a received signal strength (RSSI) equal to or greater than a certain second identification threshold, so that the history directly received from the slave unit A1 The repeater identification information is added to form the second information signal ID2, and the second information signal ID2 is transmitted to the outside. The data signal DS may be transmitted simultaneously with the second information signal ID2.
　次に、第２情報信号ＩＤ２が送信された中継器Ｒ５の近傍に配置された中継器Ｒ５は、識別情報（親機識別情報及び中継器識別情報）と履歴情報が付加された第２情報信号ＩＤ２を受信し、第２情報信号ＩＤ２の受信信号強度（ＲＳＳＩ）が一定（第２識別閾値）以上であるかどうかを判断する。例えば図１に示す中継器Ｒ５８の近傍に配置された中継器Ｒ５は、中継器Ｒ５５及び中継器Ｒ５６であり、中継器Ｒ５５及び中継器Ｒ５６それぞれは、第２情報信号ＩＤ２を中継受信部３５で受信し、中継制御部５５が第２情報信号ＩＤ２の受信信号強度（ＲＳＳＩ）が一定（第２識別閾値）以上であるかどうかを判断するようになる。例えば図１に示す中継器Ｒ５９の近傍に配置された中継器Ｒ５は、中継器Ｒ５６及び中継器Ｒ５７となり、中継器Ｒ５６及び中継器Ｒ５７のそれぞれは、第２情報信号ＩＤ２を受信し、第２情報信号ＩＤ２の受信信号強度（ＲＳＳＩ）が一定（第２識別閾値）以上であるかどうかを判断するようになる。 Next, the repeater R5 arranged in the vicinity of the repeater R5 to which the second information signal ID2 is transmitted is the second information signal to which the identification information (master unit identification information and repeater identification information) and history information are added. ID2 is received, and it is determined whether or not the received signal strength (RSSI) of the second information signal ID2 is greater than or equal to a certain value (second identification threshold). For example, the repeater R5 arranged in the vicinity of the repeater R58 shown in FIG. 1 is the repeater R55 and the repeater R56, and each of the repeater R55 and the repeater R56 receives the second information signal ID2 at the repeater receiving unit 35. The relay control unit 55 determines whether or not the received signal strength (RSSI) of the second information signal ID2 is equal to or greater than a certain value (second identification threshold). For example, the repeater R5 arranged in the vicinity of the repeater R59 shown in FIG. 1 becomes the repeater R56 and the repeater R57, and each of the repeater R56 and the repeater R57 receives the second information signal ID2, It is determined whether or not the received signal strength (RSSI) of the information signal ID2 is greater than or equal to a certain value (second identification threshold).
　そして、同様にして、第２情報信号ＩＤ２が送信された中継器Ｒ５の近傍に配置されたそれぞれの中継器Ｒ５（中継制御部５５）は、第２識別閾値以上の受信信号強度（ＲＳＳＩ）を受信した際には、この第２情報信号ＩＤ２を採用し、第２情報信号ＩＤ２の中に自身の中継器識別情報が含まれていない場合は、第２情報信号ＩＤ２を記憶部９５に保存する。一方、それぞれの中継器Ｒ５（中継制御部５５）は、第２識別閾値以下の受信信号強度（ＲＳＳＩ）を受信した際には、この受信信号強度（ＲＳＳＩ）の弱い信号を第２情報信号ＩＤ２として判断し、この第２情報信号ＩＤ２を採用せずに破棄する。なお、データ信号ＤＳが同時に送信されていた場合は、中継制御部５５は、データ信号ＤＳも同時に記憶部９５に保存するようにしている。 Similarly, each relay R5 (relay control unit 55) arranged in the vicinity of the relay R5 to which the second information signal ID2 is transmitted has a received signal strength (RSSI) equal to or higher than the second identification threshold. When the second information signal ID2 is received, the second information signal ID2 is stored in the storage unit 95 when the second information signal ID2 does not include its own repeater identification information. . On the other hand, when each repeater R5 (relay control unit 55) receives a received signal strength (RSSI) that is equal to or lower than the second identification threshold value, the repeater R5 (relay controller 55) sends a signal having a weak received signal strength (RSSI) to the second information signal ID2. And discarding the second information signal ID2 without adopting it. When the data signal DS is transmitted at the same time, the relay control unit 55 stores the data signal DS in the storage unit 95 at the same time.
　次に、ある第２識別閾値以上の受信信号強度（ＲＳＳＩ）で第２情報信号ＩＤ２を受信した中継器Ｒ５は、それまでの履歴（履歴情報）に自らの中継器識別情報を加えて、刷新した第２情報信号ＩＤ２を外部に中継送信部１５で送信する。このような手順を各中継器Ｒ５が行い、子機Ａ１からの第２情報信号ＩＤ２が中継器Ｒ５間を伝搬するようになる。これにより、第２情報信号ＩＤ２が受信信号強度（ＲＳＳＩ）のより強い組合せで中継器Ｒ５を介して伝搬していくので、子機Ａ１から中継器Ｒ５への通信をより安定して行なうことができる。 Next, the repeater R5 that has received the second information signal ID2 with a received signal strength (RSSI) equal to or greater than a certain second identification threshold adds its own repeater identification information to the previous history (history information) and renews it. The relay information transmission unit 15 transmits the second information signal ID2 that has been transmitted to the outside. Such a procedure is performed by each repeater R5, and the second information signal ID2 from the slave unit A1 propagates between the repeaters R5. As a result, the second information signal ID2 propagates through the repeater R5 with a stronger combination of received signal strengths (RSSI), so that communication from the slave unit A1 to the repeater R5 can be performed more stably. it can.
　最後に、親機Ｚ９は、親機Ｚ９の近傍に配置された中継器Ｒ５からの第２情報信号ＩＤ２を親機受信部３９で受信し、この受信した第２情報信号ＩＤ２を親機Ｚ９の記録部９９に保存する。このようにして、第２情報信号ＩＤ２が、子機Ａ１から送信され、複数の中継器Ｒ５を介して、親機Ｚ９に伝搬される。その際に、本発明の第１実施形態では、中継器Ｒ５の中継制御部５５が第２識別閾値以上の受信信号強度（ＲＳＳＩ）を有する第２情報信号ＩＤ２を送信するようにしているので、中継器Ｒ５から親機Ｚ９にデータ信号ＤＳを送信する送信経路ＴＰを絞り込むことができ、トラフィック（通行量）を抑制することができる。 Finally, the base unit Z9 receives the second information signal ID2 from the repeater R5 arranged in the vicinity of the base unit Z9 by the base unit receiving unit 39, and receives the received second information signal ID2 of the base unit Z9. Save in the recording unit 99. Thus, 2nd information signal ID2 is transmitted from subunit | mobile_unit A1, and is propagated to the main | base station Z9 via several repeater R5. At that time, in the first embodiment of the present invention, the relay control unit 55 of the relay R5 transmits the second information signal ID2 having the received signal strength (RSSI) equal to or higher than the second identification threshold. The transmission path TP for transmitting the data signal DS from the repeater R5 to the master unit Z9 can be narrowed down, and traffic (traffic volume) can be suppressed.
　次に、マルチホップ無線通信システム１０１における、送信経路ＴＰの確定方法について説明する。図５は、マルチホップ無線通信システム１０１の手順を説明する図であって、送信経路ＴＰの確定方法を示すフローチャートＣ図である。 Next, a method for determining the transmission path TP in the multi-hop wireless communication system 101 will be described. FIG. 5 is a flowchart for explaining the procedure of the multi-hop wireless communication system 101, and is a flowchart C showing a method for determining the transmission path TP.
　先ず、親機Ｚ９（親機制御部５９）は、親機受信部３９で受信し記録部９９に保存された第２情報信号ＩＤ２の全てについて確認を行う。そして、親機Ｚ９（親機制御部５９）は、それぞれの第２情報信号ＩＤ２に記録された子機識別情報及び中継器識別情報、並びに履歴を抽出して比較を行う。 First, the base unit Z9 (base unit control unit 59) confirms all the second information signals ID2 received by the base unit receiving unit 39 and stored in the recording unit 99. Then, the master unit Z9 (master unit control unit 59) extracts and compares the slave unit identification information, the relay unit identification information, and the history recorded in each second information signal ID2.
　次に、親機制御部５９は、中継器Ｒ５の内、所定の子機Ａ１から第２情報信号ＩＤ２（データ信号ＤＳも含む）が直接送信された中継器Ｒ５を所定の子機Ａ１における末端中継器として、１つ或いは複数特定する。 Next, the parent device control unit 59 sets the relay device R5 to which the second information signal ID2 (including the data signal DS) is directly transmitted from the predetermined child device A1 among the relay devices R5 to the end of the predetermined child device A1. One or more repeaters are specified.
　次に、親機制御部５９は、中継器Ｒ５であるそれぞれの末端中継器が記憶している第１情報信号ＩＤ１の順番履歴をそれぞれ比較し、それぞれの順番履歴の内、親機Ｚ９から末端中継器までの順番履歴の最も少ない経路を抽出して、この経路を有する第１情報信号ＩＤ１を選択する。そして、この順番履歴の経路の逆経路を所定の子機Ａ１におけるデータ信号ＤＳの送信経路ＴＰ１として採用している。これにより、子機Ａ１から中継器Ｒ５を介して親機Ｚ９迄のデータ信号ＤＳの送信を容易にかつ確実に行うことができるとともに、１つの子機Ａ１からのデータ信号ＤＳの送信経路ＴＰ１を１つに絞ったので、トラフィック（通行量）を大幅に抑制することができる。 Next, the parent device control unit 59 compares the order histories of the first information signal ID1 stored in each terminal repeater, which is the relay device R5, and the terminal device from the parent device Z9 in the order history. The route with the smallest order history to the repeater is extracted, and the first information signal ID1 having this route is selected. The reverse path of the order history path is employed as the transmission path TP1 for the data signal DS in the predetermined slave unit A1. As a result, the data signal DS can be easily and reliably transmitted from the slave unit A1 to the master unit Z9 via the repeater R5, and the transmission path TP1 of the data signal DS from one slave unit A1 can be transmitted. Since it is limited to one, traffic (traffic volume) can be greatly reduced.
　一方、親機制御部５９は、特定した末端中継器の内、記憶している第２情報信号ＩＤ２の受信信号強度（ＲＳＳＩ）が最も高い末端中継器を所定の子機Ａ１における指定末端中継器として、特定する。そして、この指定末端中継器である末端中継器が記憶している第１情報信号ＩＤ１の順番履歴を抽出して、この順番履歴の経路の逆経路を所定の子機Ａ１におけるデータ信号ＤＳの送信経路ＴＰ２としても採用している。これにより、子機Ａ１から中継器Ｒ５への通信を安定して行うことができるとともに、１つの子機Ａ１からのデータ信号ＤＳの送信経路ＴＰ２を１つに絞ったので、トラフィック（通行量）を大幅に抑制することができる。更に、指定末端中継器が受信する第２情報信号ＩＤ２（データ信号ＤＳ）の受信信号強度（ＲＳＳＩ）が最も高いので、子機Ａ１が送信するデータ信号ＤＳの送信信号強度を低めに抑えたとしても、指定末端中継器で確実に受けることができる。このことにより、子機Ａ１からの送信にかかる電力を低く抑えることができる。 On the other hand, the base unit control unit 59 selects the terminal relay having the highest received signal strength (RSSI) of the stored second information signal ID2 among the specified terminal relays as the designated terminal relay in the predetermined slave unit A1. As specified. Then, the order history of the first information signal ID1 stored in the terminal repeater, which is the designated terminal repeater, is extracted, and the data signal DS is transmitted in the predetermined slave unit A1 through the reverse route of this order history route. It is also adopted as the route TP2. As a result, communication from the slave unit A1 to the repeater R5 can be performed stably, and the transmission path TP2 of the data signal DS from one slave unit A1 is narrowed down to one, so traffic (traffic volume) Can be greatly suppressed. Furthermore, since the received signal strength (RSSI) of the second information signal ID2 (data signal DS) received by the designated terminal repeater is the highest, the transmission signal strength of the data signal DS transmitted by the slave unit A1 is kept low. Can also be reliably received by the designated terminal repeater. As a result, the power required for transmission from the slave unit A1 can be kept low.
　そして、経路の少ない送信経路ＴＰ１と子機Ａ１からの受信信号強度（ＲＳＳＩ）が高い送信経路ＴＰ２とが一致する場合は、親機９Ｚ（親機制御部５９）は、この送信経路ＴＰ１（送信経路ＴＰ２）を所定の子機Ａ１におけるデータ信号ＤＳの送信経路ＴＰとして確定する。一方、送信経路ＴＰ１と送信経路ＴＰ２とが一致しない場合は、親機９Ｚ（親機制御部５９）は、いずれかを送信経路ＴＰとして確定するようにしている。どちらかを選択するかは、上述した効果を選択することで、予め決めておくようにしている。 When the transmission path TP1 with a small number of paths matches the transmission path TP2 with a high received signal strength (RSSI) from the slave unit A1, the base unit 9Z (base unit control unit 59) transmits the transmission path TP1 (transmission) The route TP2) is determined as the transmission route TP of the data signal DS in the predetermined slave unit A1. On the other hand, when the transmission route TP1 and the transmission route TP2 do not match, the parent device 9Z (parent device control unit 59) determines one as the transmission route TP. Which one is selected is determined in advance by selecting the above-described effect.
　また、いずれの送信経路ＴＰの確定においても、第１情報信号ＩＤ１の受信信号強度（ＲＳＳＩ）が第１識別閾値以上の受信信号強度（ＲＳＳＩ）の場合にのみの順番履歴を反映しているので、各中継器Ｒ５同士の間及び中継器Ｒ５と親機Ｚ９との間の通信が確実に行われる。このことにより、末端中継器（中継器Ｒ５）から親機Ｚ９への通信をより安定して行なうことができる。 In addition, since any transmission path TP is determined, the order history is reflected only when the received signal strength (RSSI) of the first information signal ID1 is a received signal strength (RSSI) equal to or higher than the first identification threshold. Communication between the relays R5 and between the relay R5 and the master unit Z9 is performed reliably. As a result, communication from the terminal repeater (relay R5) to the master unit Z9 can be performed more stably.
　以上のようにして、本発明の第１実施形態では、送信経路ＴＰの確定が行われる。これにより、第１識別閾値以上の受信信号強度（ＲＳＳＩ）でしかも最適なの送信経路ＴＰを確定することができる。 As described above, the transmission path TP is determined in the first embodiment of the present invention. As a result, it is possible to determine an optimal transmission path TP with a received signal strength (RSSI) equal to or higher than the first identification threshold.
　また、本発明の第１実施形態では、親機Ｚ９が所定のタイミング（前述した時間や回数等）で第１情報信号ＩＤ１を送信するようにしている。そして、最新の第１情報信号ＩＤ１を受信した中継器Ｒ５の中継制御部５５は、直近のこの第１情報信号ＩＤ１の受信信号強度（ＲＳＳＩ）を判断して、この判断に基づいて、上述した手順に従って、直近の送信経路ＴＰを確定することとなる。このため、通信経路の間で何らかの外的要因が生じて受信信号強度（ＲＳＳＩ）が弱められた状態が継続されたとしても、所定のタイミングで、受信信号強度（ＲＳＳＩ）が直近で最も強い送信経路ＴＰを構築することができる。なお、直近の送信経路ＴＰは、中継器Ｒ５の記憶部９５及び親機Ｚ９の記録部９９に、最新の送信経路ＴＰとして、上書き保存される。 Further, in the first embodiment of the present invention, the master unit Z9 transmits the first information signal ID1 at a predetermined timing (the time and the number of times described above). Then, the relay control unit 55 of the repeater R5 that has received the latest first information signal ID1 determines the latest received signal strength (RSSI) of the first information signal ID1, and based on this determination, described above. According to the procedure, the latest transmission path TP is determined. For this reason, even if a state in which the received signal strength (RSSI) is weakened due to some external factor occurring between the communication paths continues to be transmitted with the strongest received signal strength (RSSI) at a predetermined timing. A route TP can be constructed. The latest transmission path TP is overwritten and saved as the latest transmission path TP in the storage unit 95 of the repeater R5 and the recording unit 99 of the master unit Z9.
　最後に、親機Ｚ９の親機制御部５９は、確定した送信経路ＴＰを第１情報信号ＩＤ１に含ませて、この第１情報信号ＩＤ１を親機送信部１９及びアンテナＡＴを介して送信する。そして、上述した図３に示す伝達方法で、親機Ｚ９からの確定した送信経路ＴＰが各中継器Ｒ５に伝搬するようになる。これにより、確定した送信経路ＴＰに含まれた中継器Ｒ５は、予め決められた送信経路ＴＰとして、記憶部９５に記憶することとなる。 Finally, the base unit control unit 59 of the base unit Z9 includes the determined transmission path TP in the first information signal ID1, and transmits the first information signal ID1 via the base unit transmission unit 19 and the antenna AT. . Then, by the transmission method shown in FIG. 3 described above, the determined transmission path TP from the parent device Z9 is propagated to each repeater R5. As a result, the relay R5 included in the determined transmission path TP stores it in the storage unit 95 as a predetermined transmission path TP.
　次に、マルチホップ無線通信システム１０１における、データ信号ＤＳの送受信方法ついて、図６を用いて説明する。図６は、データ信号ＤＳの送受信方法のフローチャートＤ図である。 Next, a method for transmitting and receiving the data signal DS in the multi-hop wireless communication system 101 will be described with reference to FIG. FIG. 6 is a flowchart D of the data signal DS transmission / reception method.
　先ず、図６に示すように、子機Ａ１（子機送信部１１）は、環境発電からの電力を得て、データソース５００からデータを取得し、このデータを信号処理回路でデジタル信号からアナログ信号に変換し、データ信号ＤＳを子機送信部１１で生成する。 First, as shown in FIG. 6, the slave unit A1 (slave unit transmitter 11) obtains power from the energy harvesting, acquires data from the data source 500, and analogizes this data from the digital signal by the signal processing circuit. The data is converted into a signal, and the data signal DS is generated by the slave transmitter 11.
　次に、子機Ａ１の子機送信部１１は、環境発電からの電力を得て、接続されたアンテナＡＴを介して、送信回路でデータ信号ＤＳを電波で外部に送信している。その際には、子機識別情報を含んだ第２情報信号ＩＤ２を同時に送信している。このように、子機Ａ１がデータを取得しデータ信号ＤＳを送信するのみなので、データの取得やデータの送信のための子機Ａ１が消費する環境発電の電力を最小限に抑えることができる。 Next, the slave unit transmission unit 11 of the slave unit A1 obtains power from the energy harvesting and transmits the data signal DS to the outside by radio waves in the transmission circuit via the connected antenna AT. At that time, the second information signal ID2 including the slave unit identification information is simultaneously transmitted. As described above, since the slave unit A1 only acquires data and transmits the data signal DS, the power of energy harvesting consumed by the slave unit A1 for data acquisition and data transmission can be minimized.
　次に、子機Ａ１の近傍に配置された末端中継器（中継器Ｒ５）は、図６に示すように、子機Ａ１から送信されてきたデータ信号ＤＳ（第２情報信号ＩＤ２も含む）を受信する。そして、末端中継器（中継器Ｒ５）の中継制御部５５はは、第２情報信号ＩＤ２の受信信号強度（ＲＳＳＩ）が記憶部９５に格納されていた第２識別閾値以上であるかどうかを判断し、このデータ信号ＤＳ（第２情報信号ＩＤ２も含む）を記憶部９５に保存する。 Next, as shown in FIG. 6, the terminal repeater (relay R5) arranged in the vicinity of the slave unit A1 receives the data signal DS (including the second information signal ID2) transmitted from the slave unit A1. Receive. Then, the relay control unit 55 of the terminal repeater (relay R5) determines whether or not the received signal strength (RSSI) of the second information signal ID2 is equal to or greater than the second identification threshold stored in the storage unit 95. Then, this data signal DS (including the second information signal ID2) is stored in the storage unit 95.
　一方、親機Ｚ９は、図６に示すように、データソース５００からのデータを取得するために、データ信号ＤＳの取得のためのデータ送信要求信号ＲＳを親機送信部１９から送信する。 On the other hand, the master unit Z9 transmits a data transmission request signal RS for acquiring the data signal DS from the master unit transmission unit 19 in order to acquire data from the data source 500, as shown in FIG.
　次に、中継器Ｒ５は、図６に示すように、送信されてきたデータ送信要求信号ＲＳを中継受信部３５で受信し、次いで、中継送信部１５でデータ送信要求信号ＲＳを送信する。このようにして、末端中継器に到るまでの間に存在する中継器Ｒ５は、この受信と送信を行っている。 Next, as shown in FIG. 6, the relay R5 receives the transmitted data transmission request signal RS by the relay receiving unit 35, and then transmits the data transmission request signal RS by the relay transmitting unit 15. In this way, the repeater R5 existing before reaching the terminal repeater performs this reception and transmission.
　次に、子機Ａ１の近傍に配置された末端中継器（中継器Ｒ５）は、図６に示すように、親機Ｚ９から複数の中継器Ｒ５を介して伝搬してきたデータ送信要求信号ＲＳを受信する。そして、末端中継器（中継器Ｒ５）は、このデータ送信要求信号ＲＳに基づき、記憶部９５に記憶されたデータ信号ＤＳを中継送信部１５で送信する。 Next, as shown in FIG. 6, the terminal repeater (relay R5) arranged in the vicinity of the child device A1 receives the data transmission request signal RS propagated from the parent device Z9 via the plurality of repeaters R5. Receive. Then, the terminal repeater (relay R5) transmits the data signal DS stored in the storage unit 95 by the relay transmission unit 15 based on the data transmission request signal RS.
　次に、送信経路ＴＰの中に割り振られた中継器Ｒ５は、送信されてきたデータ信号ＤＳを中継受信部３５で受信し、次いで、中継送信部１５でデータ信号ＤＳを送信する。このようにして、親機Ｚ９に到るまでの間に存在する、送信経路ＴＰの中に割り振られた中継器Ｒ５は、この受信と送信を行っている。 Next, the relay R5 allocated in the transmission path TP receives the transmitted data signal DS by the relay receiving unit 35, and then transmits the data signal DS by the relay transmitting unit 15. In this way, the relay R5 allocated in the transmission path TP that exists until reaching the master unit Z9 performs this reception and transmission.
　最後に、図６に示すように、ある時点で、親機Ｚ９がデータ信号ＤＳを受信することとなる。そして、親機Ｚ９は、このデータ信号ＤＳを記録部９９に保存する。このようにして、親機Ｚ９からのデータ送信要求信号ＲＳに基づき、予め決められた送信経路ＴＰに従って、中継器Ｒ５が子機Ａ１から送信されたデータ信号ＤＳを送信して伝搬させているので、子機Ａ１から中継器Ｒ５を介して親機Ｚ９まで、データ信号ＤＳを確実に送信することができる。なお、このデータ信号ＤＳに含まれるデータは、有線で接続された外部機器に送信される。 Finally, as shown in FIG. 6, at a certain point, the master unit Z9 receives the data signal DS. Then, base unit Z9 stores this data signal DS in recording unit 99. Thus, based on the data transmission request signal RS from the parent device Z9, the relay device R5 transmits and propagates the data signal DS transmitted from the child device A1 according to a predetermined transmission path TP. The data signal DS can be reliably transmitted from the slave unit A1 to the master unit Z9 via the repeater R5. Note that the data included in the data signal DS is transmitted to an external device connected by wire.
　以上のように構成された本発明の第１実施形態のマルチホップ無線通信システム１０１における、効果について、以下に纏めて説明する。 The effects of the multi-hop wireless communication system 101 according to the first embodiment of the present invention configured as described above will be described below.
　本発明の第１実施形態のマルチホップ無線通信システム１０１は、子機Ａ１がデータ信号ＤＳを取得し送信するのみなので、データの取得やデータの送信のための子機Ａ１が消費する環境発電の電力を最小限に抑えることができる。一方、中継器Ｒ５は、子機Ａ１が送信したデータ信号ＤＳを記憶部９５で記憶し、親機Ｚ９からのデータ送信要求信号ＲＳに基づき、記憶されたデータ信号ＤＳを予め決められた送信経路ＴＰに従って送信するので、子機Ａ１から中継器Ｒ５を介して親機Ｚ９まで、データ信号ＤＳを確実に送信することができる。これらのことにより、電力の供給が少ない子機Ａ１であっても、“子機Ａ１から親機Ｚ９への送信”を安定して行うことができる。 In the multi-hop wireless communication system 101 according to the first embodiment of the present invention, since the slave unit A1 only acquires and transmits the data signal DS, the energy harvesting consumed by the slave unit A1 for data acquisition and data transmission is performed. Electric power can be minimized. On the other hand, the repeater R5 stores the data signal DS transmitted by the slave unit A1 in the storage unit 95, and the stored data signal DS is determined in advance based on the data transmission request signal RS from the master unit Z9. Since transmission is performed according to TP, the data signal DS can be reliably transmitted from the slave unit A1 to the master unit Z9 via the repeater R5. As a result, even if the slave unit A1 has a low power supply, "transmission from the slave unit A1 to the master unit Z9" can be performed stably.
　また、中継器Ｒ５の中継制御部５５が親機Ｚ９からの第１情報信号ＩＤ１の受信信号強度（ＲＳＳＩ）を判断することにより、次に第１情報信号ＩＤ１を送信するようにして順番履歴を残し、親機Ｚ９の親機制御部５９が所定の子機Ａ１から直接送信されたデータ信号ＤＳを記憶している末端中継器を特定し、親機Ｚ９から末端中継器までの順番履歴の逆経路を送信経路ＴＰとして確定する構成とした。このことにより、この送信経路ＴＰに従い、子機Ａ１から親機Ｚ９への送信を容易にかつ確実に行うことができる。 In addition, the relay control unit 55 of the repeater R5 determines the received signal strength (RSSI) of the first information signal ID1 from the master unit Z9, so that the first information signal ID1 is transmitted next and the order history is transmitted. The base unit controller 59 of the base unit Z9 specifies the terminal repeater that stores the data signal DS transmitted directly from the predetermined handset A1, and reverses the order history from the base unit Z9 to the terminal repeater. The route is determined as the transmission route TP. Thus, transmission from the slave unit A1 to the master unit Z9 can be easily and reliably performed according to the transmission path TP.
　また、送信経路ＴＰを確定する際に、第１情報信号ＩＤ１の受信信号強度（ＲＳＳＩ）が第１識別閾値以上の受信信号強度（ＲＳＳＩ）の場合にのみの順番履歴を反映しているので、各中継器Ｒ５同士の間及び中継器Ｒ５と親機Ｚ９との間の通信が確実に行われる。このことにより、末端中継器（中継器Ｒ５）から親機Ｚ９への通信をより安定して行なうことができる。 In addition, when determining the transmission path TP, the order history is reflected only when the received signal strength (RSSI) of the first information signal ID1 is the received signal strength (RSSI) equal to or higher than the first identification threshold. Communication between the repeaters R5 and between the repeater R5 and the master unit Z9 is reliably performed. As a result, communication from the terminal repeater (relay R5) to the master unit Z9 can be performed more stably.
　また、中継器Ｒ５が第１識別閾値を異なった値で複数有しているので、マルチホップ無線通信システム１０１が選択される環境に応じて、第１識別閾値を選択することができる。このことにより、環境に応じた最適な送信経路ＴＰを確定することができ、子機Ａ１から中継器Ｒ５を介して親機Ｚ９への通信をより一層安定して行なうことができる。 In addition, since the repeater R5 has a plurality of first identification threshold values with different values, the first identification threshold value can be selected according to the environment in which the multi-hop wireless communication system 101 is selected. As a result, an optimal transmission path TP according to the environment can be determined, and communication from the slave unit A1 to the master unit Z9 via the repeater R5 can be performed more stably.
　また、第２識別閾値以上の受信信号強度（ＲＳＳＩ）の第２情報信号ＩＤ２を受信した際に、受信した第２情報信号ＩＤ２を記憶部９５に記憶するので、第２情報信号ＩＤ２が受信信号強度（ＲＳＳＩ）のより強い組合せで中継器Ｒ５を介して伝搬していく。このため、子機Ａ１から中継器Ｒ５への通信をより安定して行なうことができるとともに、中継器Ｒ５から親機Ｚ９にデータ信号ＤＳを送信する送信経路ＴＰを絞り込むことができる。これらのことにより、トラフィック（通行量）を抑制しつつ、子機Ａ１から親機Ｚ９への通信をより安定して行うことができる。 Further, when the second information signal ID2 having the received signal strength (RSSI) equal to or higher than the second identification threshold is received, the received second information signal ID2 is stored in the storage unit 95, so that the second information signal ID2 is the received signal. It propagates through the repeater R5 with a stronger combination of strength (RSSI). Therefore, communication from the slave unit A1 to the repeater R5 can be performed more stably, and the transmission path TP for transmitting the data signal DS from the repeater R5 to the master unit Z9 can be narrowed down. Thus, communication from the child device A1 to the parent device Z9 can be performed more stably while suppressing traffic (traffic volume).
　また、中継器Ｒ５が第２識別閾値を異なった値で複数有しているので、マルチホップ無線通信システム１０１が選択される環境に応じて、第２識別閾値を選択することができる。このことにより、環境に応じた最適な送信経路ＴＰを確定することができ、子機Ａ１から中継器Ｒ５を介して親機Ｚ９への通信をより一層安定して行なうことができる。 In addition, since the repeater R5 has a plurality of second identification threshold values with different values, the second identification threshold value can be selected according to the environment in which the multi-hop wireless communication system 101 is selected. As a result, an optimal transmission path TP according to the environment can be determined, and communication from the slave unit A1 to the master unit Z9 via the repeater R5 can be performed more stably.
　また、所定の子機Ａ１からの第２情報信号ＩＤ２の受信信号強度（ＲＳＳＩ）が最も高い末端中継器を、所定の子機Ａ１における指定末端中継器としたので、子機Ａ１から指定末端中継器（中継器Ｒ５）への送信を安定して行うことができ、この指定末端中継器（中継器Ｒ５）を含んだ送信経路ＴＰ（送信経路ＴＰ１）で、子機Ａ１から親機Ｚ９への通信を安定して行うことができる。また、１つの子機からのデータ信号ＤＳの送信経路ＴＰを１つに絞ったので、トラフィック（通行量）を大幅に抑制することができる。 Further, since the terminal repeater having the highest received signal strength (RSSI) of the second information signal ID2 from the predetermined slave unit A1 is used as the designated end repeater in the predetermined slave unit A1, the designated terminal repeater is relayed from the slave unit A1. The transmission to the receiver (repeater R5) can be performed stably, and the transmission route TP (transmission route TP1) including the designated terminal repeater (repeater R5) can be used to send the slave device A1 to the master device Z9. Communication can be performed stably. Further, since the transmission path TP of the data signal DS from one slave unit is narrowed down to one, traffic (traffic volume) can be significantly suppressed.
　また、本発明の第１実施形態では、親機Ｚ９が所定のタイミング（前述した時間や回数等）で第１情報信号ＩＤ１を送信するようにしている。そして、最新の第１情報信号ＩＤ１を受信した中継器Ｒ５の中継制御部５５は、直近のこの第１情報信号ＩＤ１の受信信号強度（ＲＳＳＩ）を判断して、この判断に基づいて、上述した手順に従って、直近の送信経路ＴＰを確定することとなる。このため、通信経路の間で何らかの外的要因が生じて受信信号強度（ＲＳＳＩ）が弱められた状態が継続されたとしても、所定のタイミングで、受信信号強度（ＲＳＳＩ）が直近で最も強い送信経路ＴＰを構築することができる。 Further, in the first embodiment of the present invention, the master unit Z9 transmits the first information signal ID1 at a predetermined timing (the time and the number of times described above). Then, the relay control unit 55 of the repeater R5 that has received the latest first information signal ID1 determines the latest received signal strength (RSSI) of the first information signal ID1, and based on this determination, described above. According to the procedure, the latest transmission path TP is determined. For this reason, even if a state in which the received signal strength (RSSI) is weakened due to some external factor occurring between the communication paths continues to be transmitted with the strongest received signal strength (RSSI) at a predetermined timing. A route TP can be constructed.
　なお、本発明は上記実施形態に限定されるものではなく、例えば次のように変形して実施することができ、これらの実施形態も本発明の技術的範囲に属する。 It should be noted that the present invention is not limited to the above-described embodiment, and can be implemented by being modified as follows, for example, and these embodiments also belong to the technical scope of the present invention.
　＜変形例１＞
　上記第１実施形態では、第１情報信号ＩＤ１を用いて、親機Ｚ９から末端中継器（中継器Ｒ５）までの順番履歴を取得し、この順番履歴の逆経路を所定の子機Ａ１におけるデータ信号ＤＳの送信経路ＴＰとして確定するように好適に構成したが、これに限るものではない。例えば、第２情報信号ＩＤ２を用いて、中継器Ｒ５の中継制御部５５が第２識別閾値以上の受信信号強度（ＲＳＳＩ）を有する第２情報信号ＩＤ２で区別した経路を送信経路ＴＰ３としても良い。 <Modification 1>
In the first embodiment, the first information signal ID1 is used to obtain the order history from the master unit Z9 to the terminal repeater (repeater R5), and the reverse path of this order history is transmitted to the data in the predetermined slave unit A1. Although preferably configured to be determined as the transmission path TP of the signal DS, the present invention is not limited to this. For example, a route distinguished by the second information signal ID2 having the received signal strength (RSSI) equal to or higher than the second identification threshold by the relay control unit 55 of the repeater R5 using the second information signal ID2 may be set as the transmission route TP3. .
　＜変形例２＞
　上記第１実施形態では、所定の子機Ａ１のデータ信号ＤＳを記憶している末端中継器の内、第２情報信号ＩＤ２の受信信号強度（ＲＳＳＩ）が最も高い末端中継器を、所定の子機Ａ１における指定末端中継器としたが、これに限るものではない。例えば、所定の子機Ａ１に対して配設される中継器Ｒ５の位置情報を事前に登録しておき、所定の子機Ａ１に一番近い中継器Ｒ５を指定末端中継器としても良い。 <Modification 2>
In the first embodiment, among the terminal repeaters that store the data signal DS of the predetermined slave unit A1, the terminal repeater having the highest received signal strength (RSSI) of the second information signal ID2 is used as the predetermined slave unit. Although the designated terminal repeater is used in the machine A1, it is not limited to this. For example, the position information of the repeater R5 arranged for the predetermined slave unit A1 may be registered in advance, and the repeater R5 closest to the predetermined slave unit A1 may be used as the designated terminal repeater.
　本発明は上記実施の形態に限定されず、本発明の目的の範囲を逸脱しない限りにおいて適宜変更することが可能である。 The present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the scope of the object of the present invention.
　　Ａ１　　子機
　　１１　　子機送信部
　　５１　　子機制御部
　　Ｒ５、Ｒ５１、Ｒ５２、Ｒ５３、Ｒ５４、Ｒ５５、Ｒ５６、Ｒ５７、Ｒ５８、
　　Ｒ５９　中継器
　　１５　　中継送信部
　　３５　　中継受信部
　　５５　　中継制御部
　　９５　　記憶部
　　Ｚ９　　親機
　　１９　　親機送信部
　　３９　　親機受信部
　　５９　　親機制御部
　　ＤＳ　　データ信号
　　ＩＤ１　第１情報信号
　　ＩＤ２　第２情報信号
　　ＲＳ　　データ送信要求信号
　　ＴＰ、ＴＰ１、ＴＰ２、ＴＰ３　送信経路
　　１０１　マルチホップ無線通信システム A1 handset 11 handset transmitter 51 handset controller R5, R51, R52, R53, R54, R55, R56, R57, R58,
R59 repeater 15 relay transmission unit 35 relay reception unit 55 relay control unit 95 storage unit Z9 parent unit 19 parent unit transmission unit 39 parent unit reception unit 59 parent unit control unit DS data signal ID1 first information signal ID2 second information signal RS Data transmission request signal TP, TP1, TP2, TP3 Transmission path 101 Multi-hop wireless communication system

Claims (8)

  1. 　データを含んだデータ信号を電波で送信する子機送信部を有する子機と、前記データ信号を受信する中継受信部と前記データ信号を外部に前記電波で送信する中継送信部とを有する中継器と、前記中継器からの前記データ信号を受信する親機受信部を有する親機と、を備えたマルチホップ通信システムにおいて、
    　前記親機は、自身を特定する親機識別情報と前記データ信号の取得のためのデータ送信要求信号とを含んだ第１情報信号を外部に前記電波で送信する親機送信部と、該親機送信部及び前記親機受信部を制御する親機制御部と、を有し、
    　前記中継器は、前記中継受信部及び前記中継送信部を制御する中継制御部と、前記子機からの前記データ信号を記憶する記憶部と、を有し、
    　前記子機は、太陽光発電や振動発電等の環境発電からの電力を用いて、自身を特定する子機識別情報を含んだ第２情報信号と前記データ信号とを送信し、
    　前記中継器は、前記子機からの当該第２情報信号及び当該データ信号を受信するとともに前記記憶部に記憶し、
    　前記中継器は、前記親機からの前記データ送信要求信号に基づき、記憶された前記データ信号を予め決められた送信経路に従って送信することを特徴とするマルチホップ無線通信システム。     A repeater having a slave unit that transmits a data signal including data by radio waves, a relay receiver that receives the data signals, and a relay transmitter that transmits the data signals to the outside by the radio waves And a base unit having a base unit receiving unit for receiving the data signal from the repeater, in a multi-hop communication system comprising:
    The master unit transmits a first information signal including master unit identification information for identifying itself and a data transmission request signal for acquiring the data signal to the outside by the radio wave, and the master unit A base unit control unit for controlling a base unit transmission unit and the base unit reception unit,
    The repeater includes a relay control unit that controls the relay reception unit and the relay transmission unit, and a storage unit that stores the data signal from the slave unit,
    The slave unit uses power from environmental power generation such as solar power generation and vibration power generation, and transmits the second information signal including the slave unit identification information for identifying itself and the data signal,
    The repeater receives the second information signal and the data signal from the slave unit and stores them in the storage unit,
    The repeater transmits the stored data signal according to a predetermined transmission path based on the data transmission request signal from the base unit.
  2. 　前記中継器の前記中継制御部は、前記第１情報信号の受信信号強度を判断することにより、受信した前記第１情報信号に自身を特定する中継器識別情報を加えるとともに、前記親機識別情報及び前記中継器識別情報の順番履歴も加えて、前記第１情報信号を送信し、
    　前記親機制御部は、前記中継器の内、所定の前記子機から直接送信された前記データ信号を記憶している前記中継器を末端中継器とし、前記親機から該末端中継器までの前記順番履歴の逆経路を、所定の前記子機における前記データ信号の送信経路として確定することを特徴とする請求項１に記載のマルチホップ無線通信システム。     The relay control unit of the repeater adds repeater identification information for identifying itself to the received first information signal by determining the received signal strength of the first information signal, and the master unit identification information And adding the order history of the repeater identification information, and transmitting the first information signal,
    The master unit control unit uses the repeater storing the data signal directly transmitted from the predetermined slave unit as a terminal repeater among the repeaters, and from the master unit to the terminal repeater. The multi-hop wireless communication system according to claim 1, wherein a reverse path of the order history is determined as a transmission path of the data signal in a predetermined slave unit.
  3. 　前記中継器の前記中継制御部は、前記第１情報信号の前記受信信号強度と対比する第１識別閾値を有し、該第１識別閾値以上の前記受信信号強度を受信した際に、前記第１情報信号を送信することを特徴とする請求項２に記載のマルチホップ無線通信システム。 The relay control unit of the repeater has a first identification threshold value to be compared with the received signal strength of the first information signal, and when receiving the received signal strength equal to or higher than the first identification threshold value, The multi-hop wireless communication system according to claim 2, wherein one information signal is transmitted.
  4. 　前記中継器は、前記第１識別閾値を異なった値で複数有していることを特徴とする請求項３に記載のマルチホップ無線通信システム。 The multi-hop wireless communication system according to claim 3, wherein the repeater has a plurality of the first identification threshold values with different values.
  5. 　前記中継器の前記中継制御部は、前記第２情報信号の前記受信信号強度と対比する第２識別閾値を有し、該第２識別閾値以上の前記受信信号強度を受信した際に、受信した前記第２情報信号を前記記憶部に記憶することを特徴とする請求項２ないし請求項４のいずれかに記載のマルチホップ無線通信システム。 The relay control unit of the repeater has a second identification threshold value to be compared with the received signal strength of the second information signal, and is received when the received signal strength equal to or higher than the second identification threshold value is received. The multi-hop wireless communication system according to any one of claims 2 to 4, wherein the second information signal is stored in the storage unit.
  6. 　前記中継器は、前記第２識別閾値を異なった値で複数有していることを特徴とする請求項５に記載のマルチホップ無線通信システム。 The multi-hop wireless communication system according to claim 5, wherein the repeater has a plurality of the second identification threshold values with different values.
  7. 　前記親機制御部は、所定の前記子機の前記データ信号を記憶している前記末端中継器の内、前記第２情報信号の前記受信信号強度が最も高い前記末端中継器を、所定の前記子機における指定末端中継器とすることを特徴とする請求項２ないし請求項６のいずれかに記載のマルチホップ無線通信システム。 The base unit control unit sets the terminal repeater having the highest received signal strength of the second information signal among the terminal repeaters storing the data signal of the predetermined slave unit to the predetermined unit The multi-hop wireless communication system according to any one of claims 2 to 6, wherein the multi-hop wireless communication system is a designated terminal repeater in a slave unit.
  8. 　前記親機制御部は、所定のタイミングで前記第１情報信号を送信し、
    　前記中継制御部が直近の前記第１情報信号の前記受信信号強度を判断し、この判断に基づいて、直近の前記送信経路を確定することを特徴とする請求項２ないし請求項７のいずれかに記載のマルチホップ無線通信システム。     The base unit control unit transmits the first information signal at a predetermined timing,
    8. The relay controller according to claim 2, wherein the relay control unit determines the received signal strength of the latest first information signal, and determines the latest transmission path based on the determination. A multi-hop wireless communication system according to 1.
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JP7365622B1 (en) 2023-05-08 2023-10-20 パナソニックＩｐマネジメント株式会社 Wireless communication system and wireless base unit

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