WO2017029875A1 - Système de communications sans fil à sauts multiples - Google Patents

Système de communications sans fil à sauts multiples 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
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Application number
PCT/JP2016/068149
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English (en)
Japanese (ja)
Inventor
今村　道徳
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アルプス電気株式会社
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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/ja
Priority to KR1020187000567A priority patent/KR102092801B1/ko
Publication of WO2017029875A1 publication Critical patent/WO2017029875A1/fr

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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.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Relay Systems (AREA)

Abstract

[Problème] L'invention a pour objet de mettre en place un système de communications sans fil à sauts multiples capable de réaliser de façon stable une communication d'une unité esclave à une unité maîtresse même dans le cas où l'unité esclave dispose d'une alimentation de faible puissance. [Solution] Un système de communications sans fil à sauts multiples selon l'invention comporte : une unité esclave A1 qui émet un signal DS de données comprenant des données; un relais R5 qui comporte une unité d'émission de relais servant à émettre le signal de données et une unité de réception de relais servant à recevoir le signal de données; et une unité maîtresse Z9 qui comporte une unité d'émission d'unité maîtresse servant à émettre un premier signal d'informations comprenant un signal RS de demande d'émission de données servant à acquérir le signal DS de données et une unité de réception d'unité maîtresse servant à recevoir le signal DS de données, et est caractérisé en ce que l'unité esclave A1 émet un deuxième signal d'informations comprenant des informations d'identification d'unité esclave spécifiant l'unité esclave et le signal DS de données en utilisant une puissance électrique issue d'une récupération d'énergie, en ce que le relais R5 reçoit le deuxième signal d'informations et le signal DS de données et stocke le deuxième signal d'informations et le signal DS de données dans une unité 95 de stockage de celui-ci, et en ce que le relais R5 émet le signal DS de données stocké le long d'un trajet TP d'émission prédéterminé d'après le signal RS de demande d'émission de données provenant de l'unité maîtresse Z9.
PCT/JP2016/068149 2015-08-20 2016-06-17 Système de communications sans fil à sauts multiples WO2017029875A1 (fr)

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