WO2013161302A1 - Système de communication - Google Patents

Système de communication Download PDF

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Publication number
WO2013161302A1
WO2013161302A1 PCT/JP2013/002805 JP2013002805W WO2013161302A1 WO 2013161302 A1 WO2013161302 A1 WO 2013161302A1 JP 2013002805 W JP2013002805 W JP 2013002805W WO 2013161302 A1 WO2013161302 A1 WO 2013161302A1
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WO
WIPO (PCT)
Prior art keywords
transmission
data
terminal
band
unit
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PCT/JP2013/002805
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English (en)
Japanese (ja)
Inventor
松本　正
浩基 數野
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パナソニック株式会社
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Publication of WO2013161302A1 publication Critical patent/WO2013161302A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0644—External master-clock
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0658—Clock or time synchronisation among packet nodes
    • H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
    • H04J3/0667—Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays

Definitions

  • the present invention relates to a communication system in which a communication terminal that communicates using a transmission signal and a superimposition terminal that communicates using a superimposed signal superimposed on the transmission signal are connected to the same communication line.
  • a communication system in which a transmission unit (master unit) and a plurality of terminal devices (slave units) are connected to a transmission path and communication is performed between each terminal device and the transmission unit has been widely used.
  • the transmission unit periodically monitors the state of the terminal device, and when there is a change in the state of the terminal device, the transmission unit performs other processing to perform processing corresponding to the state change.
  • There are systems that send signals to terminal devices see, for example, Japanese Patent No. 1180690, Japanese Patent No. 1195362, and Japanese Patent No. 1144477).
  • the communication system configured as described above is originally a system used for on / off control of lighting fixtures and the like, and has a low communication speed, and is not suitable for transmission of information having a relatively large amount of data such as an analog amount. .
  • the transmission signal is divided into a plurality of areas (periods) in the time axis direction for each frame, and a part of the area is assigned as a superimposable band (communication adaptation period) in which a superposed signal can be superimposed.
  • the superimposing terminal communicates with the superimposable signal assigned to a part of the transmission signal by using the superimposing signal transmitted through the communication line common to the transmission signal.
  • the communication system described in the above Japanese Patent No. 4,816,664 has a spare band (spare period) having a shorter time width than a transmission band (signal transmission period) and a reply band (signal transmission period) in a transmission signal.
  • the short circuit detection band (short circuit detection period) and the rest band (preliminary area period) are used as superimposable bands for transmission of the superimposed signal. For this reason, when data with a relatively long data length is transmitted between superimposing terminals, the data does not fit in one superimposable band and is transmitted across a plurality of superimposable bands. It may lead to a decrease in transmission speed.
  • an object of the present invention is to provide a communication system capable of transmitting data having a relatively long data length using a superimposed signal without lowering the data transmission speed.
  • the communication system of the present invention includes a transmission unit that repeatedly transmits a transmission signal to a communication line, a communication terminal that communicates using the transmission signal, and a plurality of superpositions that communicate using a superimposed signal superimposed on the transmission signal.
  • a communication system in which a terminal is connected to the communication line, and the transmission signal includes a transmission band for transmitting data to the communication terminal in a time axis direction for each frame, and a return from the communication terminal.
  • It consists of a signal of a time division method divided into a plurality of areas including a reply band that is a time slot for receiving data, and each of the plurality of superposition terminals transmits the transmission unit by the transmission signal A transmission receiver for receiving data in the transmission band, and transmission of reserved data for prohibiting transmission of the return data in the reply band next to the transmission band in the transmission band
  • a receiving unit and a processing unit that performs predetermined processing using the transmission data received by the data receiving unit are provided.
  • each of the plurality of superimposing terminals has a clock unit that counts the current time, and one of the plurality of superimposing terminals represents the current time as the transmission data.
  • the processing unit of the other superimposition terminal adjusts the time of the clock unit based on the time information. It is desirable to do.
  • each of the plurality of superimposing terminals has a clock unit that measures the current time, and one of the plurality of superimposing terminals represents the current time from an external device.
  • the time information is acquired, the time of the clock unit is adjusted based on the time information, and the time information is transmitted as the transmission data.
  • the processing unit of another superimposing terminal transmits the time from the one superimposing terminal.
  • the time information is received by the data receiving unit, it is more desirable to adjust the time of the clock unit based on the time information.
  • each of the plurality of superposition terminals transmits survival information including its own address as the transmission data
  • each processing unit of each of the plurality of superposition terminals has another superposition terminal other than itself. It is more desirable to determine that the superimposing terminal corresponding to the address included in the survival information is operating normally by receiving the survival information transmitted from the terminal by the data receiving unit.
  • each of the plurality of superimposing terminals transmits the transmission data at a transmission timing predetermined for each superimposing terminal in the superimposable band, and other superimposing terminals other than itself transmit the transmission data. It is more desirable not to transmit the transmission data if it is being transmitted.
  • the determination unit can use the reserved data for determining the superimposable band
  • the reply band can be used as the superimposable band. Therefore, the data having a relatively long data length can be obtained from the superimposed signal without reducing the data transmission speed. Can be transmitted.
  • FIG. 1 is a block diagram illustrating a schematic configuration of a communication system according to a first embodiment. It is a block diagram of the illumination system using the communication system which concerns on Embodiment 1.
  • FIG. 4 is an explanatory diagram of an operation of a basic system of the communication system according to the first embodiment.
  • FIG. 4 is an explanatory diagram of an operation of a basic system of the communication system according to the first embodiment.
  • FIG. 6 is an explanatory diagram of an operation of the communication system according to the first embodiment. 6 is an explanatory diagram of an operation of a communication system according to Embodiment 2.
  • FIG. 4 is an explanatory diagram of an operation of a basic system of the communication system according to the first embodiment.
  • FIG. 4 is an explanatory diagram of an operation of a basic system of the communication system according to the first embodiment.
  • FIG. 6 is an explanatory diagram of an operation of the communication system according to Embodiment 2.
  • FIG. 1 is a block diagram illustrating a schematic configuration of a
  • FIG. 10 is a flowchart of an operation of a reservation unit of the communication system according to the second embodiment.
  • 6 is an explanatory diagram of an operation of a communication system according to Embodiment 2.
  • FIG. 10 is an explanatory diagram of another operation of the communication system according to the second embodiment.
  • 10A to 10D are explanatory diagrams of the operation of the communication system according to the third embodiment.
  • the communication system includes a transmission unit 1 as a master unit connected to a two-wire communication line 10, a plurality of communication terminals 21 as slave units, and a plurality of communication terminals 21. And a superimposing terminal 22.
  • the communication terminal 21 is expressed as the first monitoring terminal 211 or the first control terminal 212
  • the superposition terminal 22 is expressed as the second monitoring terminal 221 or the second control terminal 222. This point will be described later.
  • the communication terminal 21 performs communication using a transmission signal (first protocol signal) transmitted through the communication line 10, and the superimposing terminal 22 superimposes the superposed signal (first signal superposed on the transmission signal). (2 protocol signals).
  • FIG. 2 shows an example in which the communication system is applied to a lighting system for controlling the lighting fixture 3 in an office building or the like.
  • one transmission unit 1 is provided for each area (for example, floor), and one or more communication terminals 21 and one or more superposition terminals 22 are connected to the communication line 10 connected to each transmission unit 1.
  • an office controller 4 for centralized monitoring control of the lighting control system is connected to the communication line 10.
  • the transmission unit 1 is connected to an energy saving controller 5 that is a host device.
  • the energy-saving controller 5 is provided for each area (for example, floor), and performs overall monitoring control on the air conditioner 6 in addition to the lighting system to which the communication system is applied.
  • the energy saving controllers 5 in a plurality of areas are connected to a personal computer (personal computer) 7 having a browser function via a network 8 such as the Internet or a LAN, and can be monitored from the personal computer 7.
  • a power measurement unit 91 is connected to one second monitoring terminal 221, and this power measurement unit 91 is consumed by a device connected to a PLC (Power Communication) tap 93. The power is measured via the monitor 92.
  • PLC Power Communication
  • the plurality of communication terminals 21 are connected in parallel to the transmission unit 1 via the communication line 10.
  • the transmission unit 1 and the plurality of communication terminals 21 are time-division multiplex transmission systems (hereinafter referred to as “time-division multiplexing transmission systems”) in which data transmission from the transmission unit 1 to the communication terminal 21 and data transmission from the communication terminal 21 to the transmission unit 1 are performed in a time division manner.
  • “Basic system” In the following, first, a schematic configuration of the basic system will be described.
  • the communication terminal 21 includes a first monitoring terminal 211 that monitors a monitoring input of a switch (not shown) such as a wall switch, a relay (not shown), and a load (here, the lighting fixture 3). It is classified into two types, the first control terminal 212 that performs on / off control and the like.
  • each communication terminal 21 stores its own address individually assigned in advance in its own memory (not shown).
  • the first monitoring terminal 211 is not limited to a switch, and may be configured to monitor a monitoring input automatically generated by a sensor such as a human sensor.
  • the transmission unit 1 includes a transmission communication unit 11 that transmits a transmission signal to the communication line 10, a return request unit 12 that transmits return request data to the communication terminal 21, and return data from the communication terminal 21.
  • a return transmission / reception unit 13, a storage unit 14, and a control unit 15 are provided.
  • the control unit 15 controls the operations of the return request unit 12 and the return transmission / reception unit 13.
  • the transmission unit 1 has a microcomputer (microcomputer) as a main component, and implements the functions of each unit by executing a program stored in the storage unit 14.
  • the transmission unit 1 stores a control table in which the first monitoring terminal 211 and the first control terminal 212 are associated by an address in the storage unit 14.
  • the first monitoring terminal 211 has a plurality of circuit switches, all the switches of the first monitoring terminal 211 correspond to only the terminal address unique to the first monitoring terminal 211, and the operation is actually performed. It is not possible to identify the only switch that was made.
  • a load number is assigned to each switch so that the only switch actually operated can be specified, and the load number is added after the terminal address of the first monitoring terminal 211. Is used as an address (identifier) unique to the switch.
  • a load number is assigned to each relay in the first control terminal 212, and an address in which the load number is added after the terminal address of the first control terminal 212 is set as an address (identifier) unique to the relay.
  • the switch-specific address and the relay-specific address are associated one-to-one or one-to-many.
  • the transmission unit 1 repeatedly transmits a transmission signal of a time division method composed of voltage waveforms in a format divided into a plurality of regions in the time axis direction as shown in FIG. That is, the transmission signal is composed of seven areas of a spare interrupt band 101, a spare band 102, a transmission band 103, a reply band 104, an interrupt band 105, a short-circuit detection band 106, and a pause band 107.
  • This is a time-division multiplexed signal with multiple poles ( ⁇ 24V).
  • each section starting from the interrupt band 105 and ending with the reply band 104 in the transmission signal is defined as one frame (F1, F2,).
  • the spare interrupt band 101 is a period for detecting the presence or absence of a secondary interrupt
  • the spare band 102 is a period set according to the interrupt band 105 and the short-circuit detection band 106
  • the transmission band 103 is the transmission unit 1 This is a period for transmitting data to the communication terminal 21.
  • the reply band 104 is a time slot in which the transmission unit 1 receives return data from the communication terminal 21, the interrupt band 105 is a period for detecting the presence or absence of an interrupt signal described later, and the short-circuit detection band 106 is short-circuited. It is a period for detecting.
  • the idle zone 107 is a period for when processing is not in time.
  • the transmission unit 1 always transmits a transmission signal whose mode data is the normal mode, and constantly polls the communication terminal 21 sequentially by changing the address data included in the transmission band 103 of this transmission signal cyclically. Do. At the time of constant polling, the communication terminal 21 whose address data included in the transmission band 103 matches its own address receives the data included in the transmission band 103 and appears first after the transmission band 103.
  • the return data is transmitted to the transmission unit 1 at 104 (hereinafter referred to as “reply band 104 next to the transmission band 103”).
  • the communication terminal 21 transmits the return data by a current mode signal (a signal transmitted by short-circuiting the communication line 10 via an appropriate low impedance) synchronized with the transmission signal return band 104. Note that power for the internal circuit of the communication terminal 21 is supplied by rectifying and stabilizing a transmission signal transmitted via the communication line 10.
  • the communication terminal 21 as the first monitoring terminal 211 detects a monitoring input, it generates an interrupt signal in synchronization with the interrupt band 105 of the transmission signal.
  • the operation of the basic system when an interrupt signal is generated in the first monitoring terminal 211 in the communication system of FIG. 1 will be described with reference to FIGS. 3 and 4.
  • the transmission unit 1 detects an interrupt signal generated in the first monitoring terminal 211 in the interrupt band 105 of the first frame F1 of the transmission signal (step S11 in FIGS. 3 and 4), the transmission signal transmission band 103 is transmitted.
  • the mode data included in is switched from the normal mode to the interrupt polling mode.
  • the transmission unit 1 uses the return request unit 12 to send return request data consisting of the upper bits of the address in the transmission band 103 of the transmission signal (step S12), and sends the address (upper bits) to the cycle. Perform address search while changing to click. If the address (upper bit) in the return request data matches the upper bit of its own address, the first monitoring terminal 211 that has generated the interrupt signal has its own address in the reply band 104 of the first frame F1. Are transmitted to the transmission unit 1 as return data (step S13). As a result, the transmission unit 1 receives the address of the first monitoring terminal 211 that generated the interrupt signal in the first frame F1 at the return transmission / reception unit 13 as return data.
  • the transmission unit 1 When the transmission unit 1 acquires the address of the first monitoring terminal 211 that has generated the interrupt signal, the transmission unit 1 designates the address in the transmission band 103 of the second frame F2 next to the first frame F1, and designates the first monitoring terminal 211.
  • Return request data is transmitted from the return request unit 12 to 211 (step S14).
  • the first monitoring terminal 211 receives the return request data including its own address, in response to this, the first monitoring terminal 211 includes the load number and on / off status of the switch corresponding to the monitoring input in the reply band 104 of the second frame F2.
  • the monitoring data is transmitted as return data to the transmission unit 1 (step S15).
  • the transmission unit 1 When the transmission unit 1 receives the return data composed of the monitoring data in the return transmission / reception unit 13, the transmission unit 1 transmits the third frame next to the second frame F2 to the first control terminal 212 corresponding to the monitoring data on the control table. Control data is transmitted in the transmission band 103 of F3 (step S16). Thereby, the 1st control terminal 212 which received control data carries out on-off control of the lighting fixture 3 according to control data.
  • the communication terminals (the first monitoring terminal 211 and the first control terminal 212) 21 communicate with each other via the transmission unit 1 in accordance with the polling / selecting protocol (first protocol). It will be.
  • the superimposition terminal 22 performs communication using the superimposition signal superimposed on the transmission signal while sharing the communication line 10 with the basic system.
  • the plurality of superposition terminals 22 are a second monitoring terminal 221 that monitors a monitoring input from a sensor or the like, and a second control terminal 222 that controls a load (in this case, the lighting fixture 3). And are classified into two types.
  • each superimposing terminal 22 stores its own address assigned in advance in its own memory (not shown).
  • each superimposing terminal 22 considers the case where data is transmitted by unicast by designating an address to a specific superimposing terminal 22, not only its own address but also other superimposing terminals 22 other than itself. An address may also be stored.
  • the communication terminal 21 and the superimposing terminal 22 distinguish between settable address areas.
  • addresses “1” to “128” can be used for the entire communication system, of which “1” to “64” are the address area of the communication terminal 21, and “65” to “128” are superposition terminals. Description will be made assuming that the address area is assigned as 22 address areas.
  • a unique address is not assigned to the superposition terminal 22, but a unique address for each sensor or load. Is assigned. That is, for example, a total of four addresses such as “65”, “66”, “67”, and “68” are assigned to the second control terminal 222 to which four loads are connected.
  • the superimposing terminal 22 includes a superimposing communication unit 23 that performs communication using a superimposing signal, a transmission receiving unit 24 that receives data transmitted by the transmission unit 1 using a transmission signal in a transmission band 103, and an interface.
  • Unit 25 and (terminal side) control unit 26 Furthermore, the superposition terminal 22 includes a determination unit 27, a reservation unit 28, and a processing unit 29, which will be described later.
  • the interface unit 25 is connected to a sensor device 9 and a lighting fixture 3 which will be described later.
  • the control unit 26 controls operations of the superimposition communication unit 23, the transmission reception unit 24, the interface unit 25, the determination unit 27, the reservation unit 28, and the processing unit 29.
  • the superimposing terminal 22 has a microcomputer (microcomputer) as a main component, and implements the functions of each unit by executing a program stored in a memory (not shown).
  • the superimposed signal is a signal having a sufficiently high frequency compared to the transmission signal, and the amount of data that can be transmitted per frame (of the transmission signal) is sufficiently large. Therefore, communication using the second protocol can increase the communication speed compared to communication using the first protocol, and is suitable for transmitting information having a relatively large amount of data such as an analog amount.
  • the second monitoring terminal 221 is connected to a sensor device 9 such as an image sensor (not shown) or a power measurement unit 91 (see FIG. 2), and has a relatively large amount of monitoring data. Used for communication.
  • the second control terminal 222 is not used for simple on / off control of the lighting fixture 3, but is used for communication of control data having a relatively large amount of data, such as dimming control and toning control. That is, the 2nd control terminal 222 is connected to the lighting fixture 3 which can perform light control and color control, and controls the lighting fixture 3 according to the control data transmitted using a superimposition signal.
  • the superposition terminal 22 of the present embodiment is configured to be able to acquire data transmitted by the transmission signal from the transmission unit 1 at the transmission receiving unit 24. However, it is not necessary for the transmission receiving unit 24 to understand all the transmission signals from the transmission unit 1, and it is only necessary to understand whether or not reserved data to be described later is included in at least the transmission signal transmission band 103.
  • the second monitoring terminal 221 functions as an adapter that converts the monitoring data input from the sensor device 9 and transmits it to the communication line 10.
  • the second control terminal 222 functions as an adapter that converts control data received from the communication line 10 according to the standard of the lighting fixture 3 and outputs the converted data to the lighting fixture 3.
  • An example of the standard of the lighting fixture 3 connected to the second control terminal 222 is DALI (Digital Addressable Lighting Interface).
  • the superimposing terminal 22 has a function of monitoring a transmission signal used in the basic system and analyzing a data transmission state (hereinafter referred to as “state”) of the transmission signal.
  • the superimposing terminal 22 monitors the transmission signal by the transmission receiving unit 24.
  • the superimposing terminal 22 determines whether or not the superimposing terminal 22 is in a superimposable band suitable for superimposition of the superimposing signal from the analysis result of the state in the determining unit 27, and at the timing determined as the superimposable band in the superimposing communication unit 23.
  • a superimposed signal is superimposed on the transmission signal.
  • the superimposing terminal 22 uses the reply band 104 (see FIG. 3) of the transmission signal as a superimposable band for superimposing the superimposed signal. That is, the reply band 104 does not affect the communication of the first protocol even if the superimposed signal is superimposed, and the superimposed signal is not easily affected by the transmission signal. Furthermore, the reply band 104 has a longer time during which the transmission signal is stable at a high level or a low level than the spare interrupt band 101, the spare band 102, and the pause band 107, and the ratio of the transmission signal to one frame is long. Since it is large, it is suitable for superimposition of a superimposed signal.
  • the transmission band 103 In other areas (the transmission band 103, the interrupt band 105, and the short-circuit detection band 106), the time during which the transmission signal is stable at the high level or the low level is relatively short. It is easy to affect communication. Further, when a superimposed signal is superimposed on the other area, the superimposed signal is also easily affected by a signal (interrupt signal or transmission data) exchanged between the transmission unit 1 and the communication terminal 21. Therefore, in the present embodiment, the area other than the reply band 104 is an area that is not used for superimposing the superimposed signal (hereinafter referred to as “non-superimposable band”).
  • the time width of the reply band 104 is about 6.5 ms, and the superposition terminal 22 can superimpose 5 bytes of data on 700 ⁇ s by the superposition signal. 46 bytes of data can be transmitted during 104. In this case, if the frame period of the transmission signal is about 15 ms, the transmission rate is about 24 kbps.
  • the determination unit 27 of the superimposing terminal 22 determines that the reply band 104 used for transmission of return data from the communication terminal 21 to the transmission unit 1 is a non-superimposable band even if the reply band 104 is used. It is not used for signal superimposition. That is, the superimposing terminal 22 uses the return band 104 in which the return data is not transmitted from the communication terminal 21 to the transmission unit 1 as a superimposable band suitable for superimposing the superimposed signal for superimposing the superimposed signal. Therefore, the determination unit 27 determines whether or not the return data is transmitted for the area recognized as the return band 104 by the transmission reception unit 24, and the return band 104 where the return data is not transmitted can be superimposed. Judge.
  • the transmission unit 1 transmits a reply band 104 next to the transmission band 103 in the transmission band 103 of the transmission signal (that is, the reply band 104 that appears first after the transmission band 103).
  • a band securing unit 18 is provided for transmitting securing data for securing for superimposition by a transmission signal.
  • the band securing unit 18 transmits the secured data from the transmission communication unit 11 in synchronization with the transmission band 103 of the transmission signal.
  • the reserved data here refers to the transmission band 103 in which the reserved data is transmitted by prohibiting the transmission of return data from all the communication terminals 21 in the reply band 104 next to the transmission band 103 in which the reserved data is transmitted.
  • Is a data that secures the next reply band 104 for the superimposition of the superimposition signal for example, dummy data consisting of empty packets having no specific meaning.
  • each superimposing terminal 22 determines that the reply band 104 next to the transmission band 103 that has received the secure data is a superimposable band. That is, since the reply band 104 (same frame as the transmission band 103) immediately after the transmission band 103 from which the secure data is transmitted from the transmission unit 1 is not used for transmission of the return data, the determination unit 27 determines whether the reply band 104 104 is determined as a superimposable band.
  • the transmission unit 1 sends a timing synchronization pulse for time synchronization with the communication terminal 21 every predetermined time (for example, 1 second) to a plurality of communication terminals 21 using the transmission band 103 of the transmission signal. Broadcasting simultaneously.
  • This timing synchronization pulse does not cause the communication terminal 21 to transmit return data, unlike the data that the transmission unit 1 always transmits during polling and the return request data that is transmitted in the interrupt polling mode. That is, the communication terminal 21 does not transmit the return data in the reply band 104 next to the transmission band 103 that has received this timing synchronization pulse.
  • the band securing unit 18 uses a timing synchronization pulse as secured data. Therefore, when the superimposing terminal 22 receives the timing synchronization pulse periodically transmitted from the transmission unit 1 by the transmission signal in the transmission band 103, the superimposing terminal 22 can superimpose the reply band 104 next to the transmission band 103 that has received the timing synchronization pulse. Judge.
  • the superimposition communication unit 23 of each superimposition terminal 22 functions as a data transmission unit that transmits data by a superimposition signal and a data reception unit that receives data transmitted by a superimposition signal from another superimposition terminal 22 other than itself.
  • the superimposition communication unit 23 is configured to transmit a superimposition signal only when the determination unit 27 determines that the band can be superimposed (that is, the reply band 104 next to the transmission band 103 that has received the secured data). .
  • the superimposing terminal 22 superimposes the superimposition signal only on the superimposable band in synchronization with the transmission signal, thereby preventing interference between the first protocol communication using the common communication line 10 and the second protocol communication. To avoid.
  • the determination unit 27 determines that a predetermined avoidance time (for example, 300 ⁇ s) after the switching (rise) of the region is a non-overlapping zone even in the reply zone 104 in which the return data is not transmitted.
  • a predetermined avoidance time for example, 300 ⁇ s
  • the power supply to the superposition terminal 22 is performed by a method (centralized power supply method) that is supplied by rectifying and stabilizing a transmission signal transmitted from the transmission unit 1 via the communication line 10 in the same manner as the communication terminal 21.
  • a method centralized power supply method
  • the power supply to the superposition terminal 22 is not limited to this configuration, and may be performed by a method (local power supply method) that is supplied by rectifying and stabilizing the commercial power supply.
  • a plurality of superposition terminals 22 can directly communicate with each other by a superposition signal, and each superposition terminal 22 receives transmission data transmitted by a superposition signal from other superposition terminals 22 other than itself.
  • a processing unit 29 is provided that performs predetermined processing using the transmission data.
  • the superimposing terminal 22 can transmit the transmission data by unicast by designating the address of the specific superimposing terminal 22 when transmitting the transmission data by the superimposing signal from the superimposing communication unit 23 as the data transmitting unit. Then, basically, transmission data is transmitted by broadcast. That is, the plurality of superimposing terminals 22 are configured to execute some processing in the processing unit 29 by receiving transmission data transmitted by broadcast by any one superimposing terminal 22.
  • each superimposing terminal 22 has a clock unit (not shown) that measures the current time.
  • one superimposing terminal 22 periodically transmits time information indicating the current time measured by its own clock unit as transmission data by broadcasting.
  • Each other superposition terminal 22 that has received the transmission data including the time information performs time adjustment of the clock unit based on the time information in the processing unit 29.
  • the superimposition terminals 22 can perform time adjustment using the superimposition signal, and the time can be synchronized for all the plurality of superimposition terminals 22 in the communication system.
  • the superimposition terminal 22 has a GPS (Global Positioning System) receiver
  • the clock function of the GPS receiver can be used as a clock unit.
  • each superimposing terminal 22 has a clock unit for measuring the current time, and at least one superimposing terminal 22 has an interface (not shown) for connecting an external device such as a GPS receiver.
  • the superimposition terminal 22 connected to the external device acquires time information representing the current time from the external device
  • the time adjustment of the clock unit is performed based on the time information, and the time information is broadcasted as transmission data periodically.
  • Each other superposition terminal 22 that has received the transmission data including the time information performs time adjustment of the clock unit based on the time information in the processing unit 29.
  • each superimposing terminal 22 periodically transmits survival information including at least its own address as transmission data.
  • Each superimposing terminal 22 receives the survival information from other superimposing terminals 22 other than itself, and the processing unit 29 confirms the surviving state of the superimposing terminal 22 at the address included in the survival information. That is, each superimposing terminal 22 determines that the superimposing terminal 22 that is the transmission source of the received survival information is operating normally, and some abnormality has occurred with respect to the superimposing terminal 22 to which no surviving information is transmitted.
  • each superposition terminal 22 voluntarily transmits the survival information by broadcast once every predetermined time (for example, one day, one hour).
  • Each superposition terminal 22 stores the reception time of the latest survival information from other superposition terminals 22 other than itself for each superposition terminal 22, and within a predetermined set time (predetermined time + ⁇ ) from this time.
  • predetermined time + ⁇ a predetermined set time from this time.
  • each superimposing terminal 22 determines that an abnormality has occurred in the superimposing terminal 22 when the next surviving information cannot be received even after a set time has elapsed from the reception time of the latest surviving information.
  • the plurality of superposition terminals 22 can perform survival confirmation by detecting the presence or absence of abnormality by communicating with each other using superposition communication. Therefore, the communication system can detect the presence / absence of abnormality of the superposition terminal 22 without introducing a dedicated management device.
  • each superimposition terminal 22 transmits survival information only at a pace once per predetermined time, transmission timings of transmission data (survival information) from a plurality of superposition terminals 22 hardly overlap. However, even if the transmission timings of the survival information from the plurality of superposition terminals 22 may overlap, the superposition signals from the plurality of superposition terminals 22 interfere with each other by adopting the configuration described later in the communication system. You can avoid that.
  • the plurality of superimposing terminals 22 receive the transmission data transmitted by broadcast using one of the superimposing terminals 22 by using the superimposing signal, thereby allowing the processing unit 29 to adjust the time and confirm the survival. Etc. can be executed. Therefore, the communication system can perform time adjustment and survival confirmation of the superimposed terminal 22 without stopping the operation of the basic system using the transmission signal.
  • the superimposition terminal 22 does not transmit the transmission data as soon as the superimposable band is reached, but first transmits the reservation data, and not the superimposable band from which the reservation data is transmitted.
  • the transmission data is transmitted after acquiring the transmission right of the transmission data in the superimposable band.
  • the superimposing terminal 22 that can transmit transmission data with a superimposition signal in the superimposable band is only one superimposing terminal 22 that is given the transmission right of transmission data in the superimposable band, and the other superimposing terminals 22 transmit Sending data is prohibited.
  • the superimposing terminal 22 acquires the transmission right of transmission data in the reserved band in the reply band 104 determined to be a superimposable band by the determination unit 27, with the next superimposable band as a reserved band. Reservation data for this is transmitted by the reservation unit 28.
  • the reservation unit 28 generates reservation data, and transmits the reservation data by broadcast from the superimposition communication unit 23 using a superimposition signal.
  • the reservation data includes at least the address of the superimposing terminal 22 that is the transmission source. Therefore, another superimposing terminal 22 that has received the reservation data transmitted by broadcasting from a certain superimposing terminal 22 can identify the superimposing terminal 22 that is the transmission source of the reservation data from the address included in the reservation data.
  • the superimposition communication unit 23 functioning as a data transmission unit transmits transmission data by a superimposition signal in a reserved band (superimposable band) where the transmission right is acquired by the reservation data.
  • the superimposition communication unit 23 transmits transmission data in a superimposable band reserved in advance with reservation data. Therefore, each superimposition terminal 22 does not transmit a superposition signal in a reservation band in which it has failed to acquire the transmission right, such as a reservation band in which the transmission right is given to another superimposition terminal 22 other than itself.
  • the superimposition terminal 22 when any one of the plurality of superimposing terminals 22 transmits the reservation data in the reservation unit 28, all the remaining superimposing terminals 22 receive the reservation data, and the reservation data Is given the transmission right of transmission data in the superimposable band next to the superimposable band in which the reservation data is transmitted and received. Therefore, in the superimposable band in which the transmission right is given to the superimposition terminal 22 that is the transmission source of the reservation data, the superimposition terminal 22 that has received the reservation data does not transmit any superimposition signal.
  • the superimposition terminal 22 having the address “65” transmits the reservation data among the superposition terminals 22 having the addresses “65” to “67”
  • the superimposition possible band in which the superimposition terminal 22 having the address “65” has transmitted the reservation data is used.
  • the right to transmit data in the next superimposable band (reserved band) is acquired.
  • the superimposition terminal 22 having the addresses “66” and “67” receives the reservation data from the superimposition terminal 22 having the address “65” at the superimposition communication unit 23, the superimposition communication unit 23 receives the reservation data.
  • the superimposable band is reserved for the superimposing terminal 22 having the address “65” by not using the superimposable band for transmitting the superimposing signal.
  • the superimposition terminal 22 acquires the transmission right of the transmission data in one superimposable band (reply band 104) per reservation data, and ends transmission of the transmission data in the superimposable band from which the transmission right is acquired. To do.
  • the transmission unit 1 performs communication using the transmission signal with the communication terminal 21 in the first frame F1 of the transmission signal, and the timing as the reserved data in the transmission band 103 of the second frame F2 of the transmission signal.
  • a synchronization pulse is transmitted (step S21 in FIG. 5).
  • the superimposition terminal 22 transmits the reservation data by broadcast using the superimposition signal in the reply band 104 of the second frame F2 (step S22).
  • the transmission unit 1 performs communication using the transmission signal with the communication terminal 21 until the (n ⁇ 1) th frame Fn ⁇ 1 of the transmission signal, and in the transmission band 103 of the nth frame Fn of the transmission signal.
  • a timing synchronization pulse as secured data is transmitted (step S23).
  • the superimposition terminal 22 that has acquired the transmission right by the reservation data in the second frame F2 transmits the transmission data by the superimposition signal in the reply band 104 of the nth frame Fn. (Step S24).
  • the superposition terminal 22 superimposes the superimposition signal only on the superimposable band of the transmission signal in synchronization with the transmission signal, so that communication with the first protocol using the common communication line 10 is performed. Interference with communication of the second protocol can be avoided.
  • the superimposing terminal 22 uses the reserved data for the determination of the superimposable band, and therefore uses the reply band 104 having a relatively long time width in the transmission signal as a superimposable band for transmission of the superimposing signal. Even relatively long data can be transmitted in one superimposable band. Therefore, since the superimposing terminal 22 does not need to transmit data in small pieces even when transmitting data having a relatively long data length, data having a relatively long data length can be obtained from the superimposing signal without reducing the data transmission speed. Can be transmitted.
  • the superimposing terminal 22 does not transmit transmission data as soon as the superimposable band is reached, but first transmits reservation data and grants the transmission right of transmission data in the next superimposable band. Send the transmission data after acquiring. Therefore, in the communication system according to the present embodiment, it is possible to avoid interference (collision) between superimposed signals caused by a plurality of overlapping terminals 22 transmitting data simultaneously in the same overlapping possible band.
  • the timing synchronization pulse for time synchronization with the communication terminal 21 transmitted by the transmission unit 1 at regular time intervals is used as secured data for securing the reply band 104 as a superimposable band. is doing.
  • the transmission unit 1 does not need to newly generate dedicated data as reserved data for securing the reply band 104 for superimposition of the superimposition signal, so that the reply band does not affect the operation of the basic system.
  • 104 can be secured for superimposing the superimposition signal. Therefore, according to this communication system, the transmission signal return band 104 can be used as a superimposable band for transmission of the superimposed signal without changing the specification of the transmission unit 1.
  • the bandwidth securing unit 18 of the transmission unit 1 is not limited to the configuration using the timing synchronization pulse as the secured data, but may be configured to generate and transmit dedicated secured data separately from the timing synchronized pulse.
  • the bandwidth securing unit 18 is not limited to the configuration in which the secured data is periodically transmitted, and may be transmitted at a timing determined according to the schedule stored in the storage unit 14, for example, or determined randomly. You may transmit at a timing.
  • the transmission unit 1 may be configured to determine the timing for transmitting the secured data in response to an instruction from a host device such as the energy saving controller 5 (see FIG. 2) or to change the schedule.
  • FIG. A configuration in which communication is performed using a superimposed signal may be used.
  • the transmission unit 1 includes the superimposition communication unit 16 (see FIG. 1) that communicates with the superimposition terminal 22 using a superimposition signal, and is configured to be able to communicate with the superimposition terminal 22 as well as the communication terminal 21. Is done. Thereby, the transmission unit 1 can control the load (the lighting fixture 3) connected to the first control terminal 212, for example, according to the monitoring input generated at the second monitoring terminal 221.
  • the address of the second monitoring terminal 221 (sensor-specific address) and the address of the first control terminal 212 (relay-specific address) are associated with each other. ing.
  • the address of the first monitoring terminal 211 and the address of the second control terminal 222 are associated with each other, or the address of the second monitoring terminal 221 and the address of the second control terminal 222 are associated with each other. Or you may.
  • the 2nd monitoring terminal 221 transmits the output data of the sensor apparatus (image sensor, power measurement unit 91, etc.) 9 connected to self to the transmission unit 1 as transmission data.
  • the transmission data here refers to the output data (image, power information, temperature, humidity, CO 2 amount, presence / absence of a person, etc.) of the sensor device 9 that is a monitoring input, and the address of the second monitoring terminal 221 that is the transmission source Information, length information indicating the data length, time information, position information, and the like. That is, the superimposition communication unit 16 of the transmission unit 1 receives transmission data based on the superimposition signal transmitted from the second monitoring terminal 221 in a transmission signal superimposable band. As a result, the transmission unit 1 can acquire output data (monitoring input) of the sensor device 9 connected to the second monitoring terminal 221 as transmission data.
  • the transmission unit 1 transmits control data using a superimposed signal to the second control terminal 222 based on the transmission data acquired from the second monitoring terminal 221, and loads (lighting) connected to the second control terminal 222.
  • Control the instrument 3 The correspondence relationship between the second monitoring terminal 221 and the second control terminal 222 is basically set on the control table, but is not limited to this, and the load to be controlled (lighting fixture 3) is not limited to this. An address may be included.
  • the transmission data may include specific control contents relating to, for example, light control or color control.
  • the transmission unit 1 uses a superimposed signal superimposed on the transmission signal return band 104, so that the return data from the communication terminal 21 and the control in the reply band 104 are controlled. It is necessary to avoid interference with data (superimposed signal). Therefore, the transmission unit 1 uses the reply band 104 that is the reply band 104 next to the transmission band 103 that has transmitted the secure data and that does not give any superimposition terminal 22 a transmission right for transmission of control data. It is desirable to do.
  • the operation of the communication system when controlling the load (lighting fixture 3) connected to the second control terminal 222 according to the monitoring input generated at the second monitoring terminal 221 is illustrated, but the control up to the load control is also performed.
  • the transmission unit 1 may be configured to be able to acquire transmission data from the second monitoring terminal 221, and can transmit control data. Not required.
  • FIG. 1 the configuration in which the superimposition communication unit 16 is built in the transmission unit 1 is illustrated. However, the configuration is not limited thereto, and the superimposition communication unit is provided separately from the transmission unit 1. May be connected to each other.
  • each superimposing terminal 22 receives the reservation data transmitted by the superimposing terminal 22 other than itself while transmitting the self-reserving data. Both the timing at which the terminal 22 transmits the reservation data can be grasped. Therefore, each superimposing terminal 22 can grasp the prior relationship (order) of the transmission timing of the reservation data for a plurality of superimposing terminals 22 that transmit the reservation data in the same superimposable band.
  • the first method is a method in which a transmission right is given only to one superimposing terminal 22 that has transmitted reservation data first among a plurality of superimposing terminals 22.
  • each superimposing terminal 22 that has transmitted the reservation data compares its own transmission timing with the timing at which the other superimposing terminal 22 other than itself transmits the reservation data.
  • the transmission right in the reserved zone can be acquired only when is first. That is, in the superimposition terminal 22 with the timing at which the reservation data is transmitted for the second and subsequent times, by not using the superimposable band next to the superimposable band that transmitted the reservation data for transmission of the transmission data, The next superimposable band is secured for the superimposing terminal 22 that transmitted first.
  • the second method is a method of assigning the transmission right in the superimposable band to all the plurality of superposition terminals 22 that have transmitted the reservation data.
  • each superimposing terminal 22 that has transmitted the reservation data compares the timing at which the superimposition terminal 22 transmits the reservation data with the timing at which the other superimposition terminal 22 other than the self transmits the reservation data.
  • the order of transmitting the reservation data for the superimposing terminal 22 is grasped. In this case, the transmission right is given to the plurality of overlapping terminals 22 in the order in which the reservation data is transmitted first.
  • the superimposition terminal 22 with the earliest transmission timing of the reservation data is given the transmission right of transmission data in the next superimposable band, and the transmission timing of the reservation data is with respect to the second superposition terminal 22. Is given the right to transmit transmission data in the next superimposable band. That is, each superimposition terminal 22 acquires the transmission right of the transmission data in the nth superimposable band after transmitting the reservation data if the transmission timing of its own reservation data is nth.
  • the superimposition terminal 22 since the superimposition terminal 22 transmits the reservation data using the superimposition signal, if the transmission timing of the reservation data overlaps, the superimposition signals interfere with each other so that the reservation data becomes normal. It may not be received.
  • the reservation unit 28 is configured to transmit reservation data at a transmission timing determined in advance for each superimposing terminal 22 in the superimposable band.
  • each superimposing terminal 22 has a predetermined waiting time from the start of the superimposable band to the start of transmission of reservation data based on its own address.
  • the time required for transmitting the reservation data is a unit time Ta
  • each superimposing terminal 22 is assigned a waiting time shifted by the unit time Ta.
  • the transmission timing of the reservation data is the superimposing terminal 22 with the address “65”, the superimposing terminal 22 with “66”, They are set so as to be shifted by unit time Ta in the order of the superposition terminal 22 of “67”.
  • the superimposable band starts after a predetermined avoidance time (for example, 300 ⁇ s) from the time when the reply band 104 rises as described above, if the avoidance time is represented by “Tc”, for example, the address number is “N (65
  • the superimposition terminal 22 of “the integer above” ” transmits the reservation data with a delay of“ (N ⁇ 65) ⁇ Ta + Tc ”from the rising point of the reply band 104.
  • the transmission unit 1 transmits the timing synchronization pulse as the secured data in the transmission band 103 of the second frame F2 of the transmission signal (step S31)
  • the superposition terminal 22 transmits the second frame.
  • the reservation data is transmitted in the reply band 104 of F2 (step S32).
  • the transmission timing of the reservation data is the superimposition terminals 22 and 66 of address “65”.
  • the terminal 22 is in the order of the superposition terminal 22 of “67”.
  • the transmission unit 1 performs communication using the transmission signal with the communication terminal 21 until the (n ⁇ 1) th frame Fn ⁇ 1 of the transmission signal, and in the transmission band 103 of the nth frame Fn of the transmission signal.
  • a timing synchronization pulse as secured data is transmitted (step S33).
  • the superimposing terminal 22 having the address “65” that first transmitted the reservation data in the second frame F2 transmits the superimposition signal in the reply band 104 of the nth frame Fn.
  • Data is transmitted (step S34).
  • the plurality of superimposing terminals 22 do not overlap the transmission timing of the reservation data, and can avoid a situation in which the reservation data is not normally received due to interference between the superimposed signals.
  • the plurality of superimposing terminals 22 sequentially transmit the reservation data in the same superimposable band, the reservation data from the plurality of superimposing terminals 22 can be transmitted relatively efficiently.
  • the reservation unit 28 may be configured to transmit reservation data at a transmission timing that is randomly determined for each superimposition terminal 22 in the superimposable band. Specifically, each superimposing terminal 22 determines the waiting time from the start of the superimposable band to the start of transmission of the reservation data using a random number when transmitting the reservation data. That is, the waiting time is calculated by multiplying a random number by a coefficient (for example, 10 ⁇ s).
  • a coefficient for example, 10 ⁇ s.
  • the superimposable band starts after a predetermined avoidance time (for example, 300 ⁇ s) from the time when the reply band 104 rises as described above, the superposition terminal 22 determines that “random number ⁇ coefficient + avoidance” from the time when the reply band 104 rises.
  • the reservation data is transmitted with a delay of “time”.
  • the reservation unit 28 of each superimposition terminal 22 first starts the transmission of the reservation data after the waiting time has elapsed from the start of the superimposable band, and other superimposition terminals 22 other than the self first receive the reservation data. It is determined whether transmission is in progress. If transmission is in progress, the transmission of the reservation data is forgotten. At this time, the reservation unit 28 confirms the remaining time of the superimposable band, and if there is sufficient remaining time to transmit another reservation data after the transmission of the reservation data being transmitted is completed, the reservation data being transmitted After completing the transmission, the reservation data is transmitted by itself.
  • the reservation unit 28 of each superimposing terminal 22 confirms the end of transmission of the reservation data from other superimposing terminals 22 other than itself, recalculates the waiting time using a random number, and reserves after the obtained waiting time has elapsed. Data may be sent.
  • the reservation unit 28 of each superimposing terminal 22 first calculates a waiting time using a random number (step S41), and after the waiting time has elapsed, reservation data from other superimposing terminals 22 other than itself is reserved. It is determined whether or not there is a transmission (step S42). If there is no transmission of reservation data from the other superposition terminal 22 (step S42: No), the reservation unit 28 transmits reservation data (step S43). On the other hand, if there is transmission of reservation data from another superimposition terminal 22 (step S42: Yes), the reservation unit 28 has a sufficient margin for confirming the remaining time of this superimposable band and further transmitting reservation data. It is determined whether or not there is (step S44).
  • step S44: No if there is not enough time remaining (step S44: No), the reservation unit 28 defers transmission of reservation data in this superimposable zone (step S45). On the other hand, if there is room in the remaining time (step S44: Yes), the reservation unit 28 waits for the completion of the transmission of the reservation data from the other superposition terminal 22 (step S46), and calculates the waiting time (step S41). Return to.
  • the plurality of superimposing terminals 22 can prevent the transmission timing of the reservation data from overlapping, and can avoid a situation in which the reservation data is not normally received due to interference between the superimposed signals.
  • the waiting time is randomly determined, the order in which the plurality of superimposing terminals 22 transmit the reservation data varies, so that an opportunity to transmit the reservation data to the plurality of superimposing terminals 22 is given fairly. become. Therefore, the communication system can avoid giving the transmission right of the transmission data to only the specific superimposing terminal 22 by the specific superimposing terminal 22 transmitting the reservation data first.
  • each superimposing terminal 22 can transmit itself to the same superimposable band if there is a sufficient margin in the remaining time of the superimposable band after completing the transmission of the reservation data from other superimposing terminals 22 other than itself. Since reservation data is transmitted, one superimposable band can be used for transmission of reservation data from a plurality of superimposing terminals 22. Therefore, the communication system can relatively efficiently send reservation data from a plurality of superposition terminals 22.
  • the reservation data includes length information indicating the data length of the transmission data to be transmitted in the reservation band, in addition to the address of the superimposing terminal 22 that is the transmission source.
  • the plurality of superimposing terminals 22 that have transmitted the reservation data in the same superimposable band are grouped so that the total data length indicated by the length information included in the reservation data is equal to or less than a predetermined allowable length.
  • the superimposing terminals 22 belonging to the same group are given transmission rights in the same reserved band.
  • each superimposing terminal 22 sequentially adds the data length indicated by the length information included in the transmitted reservation data, and until the total data length falls within the allowable length or less, the same group. recognize. That is, since the transmission right is given to the plurality of superposition terminals 22 in the order in which the reservation data is transmitted, the plurality of superpositions are performed within the range in which the total data length of the transmission data falls within the allowable length in the order of transmission of the reservation data. Terminals 22 are classified into the same group. The superimposing terminals 22 classified in the same group acquire the transmission right in the same reserved band, and therefore transmit transmission data in the same superimposable band (reserved band) in the order of transmission of the reserved data.
  • the transmission unit 1 transmits a timing synchronization pulse as secured data in the transmission band 103 of the second frame F2 of the transmission signal (step S51)
  • the superposition terminal 22 transmits the second frame
  • the reservation data is transmitted in the reply band 104 of F2 (step S52).
  • the reservation data is sequentially transmitted from the two superposition terminals 22 whose addresses are “65” and “66”, respectively, and the total data length of the transmission data from these two superposition terminals 22 is an allowable length. Is assumed to be less than or equal to
  • the transmission unit 1 performs communication using the transmission signal with the communication terminal 21 until the (n ⁇ 1) th frame Fn ⁇ 1 of the transmission signal, and in the transmission band 103 of the nth frame Fn of the transmission signal.
  • a timing synchronization pulse as secured data is transmitted (step S53).
  • the superimposing terminal 22 having the address “65” that first transmitted the reservation data in the second frame F2 transmits the superimposition signal in the reply band 104 of the nth frame Fn.
  • Data is transmitted (step S54).
  • the superimposing terminal 22 having the address “66” transmits the transmission data from the superimposing terminal 22 having the reply band 104 of the nth frame Fn and having the address “65”. After completion, the transmission data is transmitted by the superimposed signal (step S55).
  • the superimposable band can be efficiently used for transmission of transmission data.
  • the superimposing terminal 22 interrupts communication at the end of the superimposable band and remains in the next superimposable band. Send the data. That is, the superimposing terminal 22 divides the transmission data into a length that can be superimposed on the superimposable band when transmitting the transmission data.
  • the reservation data includes frame information indicating the number of superimposable bands required for transmission of transmission data, and the superimposing terminal 22 has the right to transmit in the number of superimposable bands (reserved bands) according to the frame information. May be provided.
  • the superimposition terminal 22 can acquire the transmission right of the transmission data in the number of superimposable bands necessary for transmitting the transmission data, it is possible to transmit the transmission data using the plurality of superimposable bands.
  • the frame information may be at least one of information directly indicating the number of necessary superimposable bands and the length information described above.
  • the length information is information indicating the data length of the transmission data, if the data length that can be transmitted in one superimposable band is known, transmission of transmission data can be performed from the relationship with the known data length.
  • the number of necessary superimposable bands can be specified.
  • the transmission unit 1 transmits a timing synchronization pulse as secured data in the transmission band 103 of the first frame F1 of the transmission signal (step S61)
  • the superposition terminal 22 transmits the first frame.
  • the reservation data is transmitted in the reply band 104 of F1 (step S62).
  • the transmission unit 1 performs communication using the transmission signal with the communication terminal 21 until the (n ⁇ 1) th frame Fn ⁇ 1 of the transmission signal, and in the transmission band 103 of the nth frame Fn of the transmission signal.
  • a timing synchronization pulse as secured data is transmitted (step S63).
  • the superimposition terminal 22 Upon receiving the timing synchronization pulse in the nth frame Fn, the superimposition terminal 22 that has transmitted the reservation data in the first frame F1 transmits a part of the transmission data by the superimposition signal in the reply band 104 of the nth frame Fn. (Step S64).
  • the transmission unit 1 performs communication using the transmission signal with the communication terminal 21 until the second n-1 frame F2n-1 of the transmission signal, and in the transmission band 103 of the second n frame F2n of the transmission signal.
  • a timing synchronization pulse as secured data is transmitted (step S65).
  • the superposition terminal 22 that has transmitted the reservation data in the first frame F1 transmits the remainder of the transmission data by the superposition signal in the reply band 104 of the second n frame F2n ( Step S66).
  • the superimposing terminal 22 uses a plurality of superimposable bands (reserved bands) for which transmission rights have been acquired with reserved data, even for transmission data that does not fit in one superimposable band such as a long packet. Can be sent.
  • the overlapping communication unit 23 of the overlapping terminal 22 transmits transmission data without using reservation data. This is different from the communication system of the first embodiment.
  • the same configurations as those of the first embodiment are denoted by common reference numerals, and description thereof is omitted as appropriate.
  • the superimposition communication unit 23 of each superimposition terminal 22 transmits transmission data at a transmission timing predetermined for each superimposition terminal 22 in the superimposable band, and other superimposition terminals 22 other than itself transmit data.
  • the transmission data is configured not to be transmitted during transmission. That is, each superimposing terminal 22 is configured not to transmit transmission data as soon as the superimposable band is reached, but to transmit transmission data at a transmission timing predetermined for each superimposing terminal 22 in the superimposable band. ing.
  • each superimposing terminal 22 has a waiting time from the start of the superimposable band (that is, the reply band 104 next to the transmission band 103 that has received the secured data) to the start of transmission of transmission data at its own address. Based on this.
  • a waiting time shifted by the delay time Tb is assigned to each superimposing terminal 22. Therefore, for example, when the addresses of the plurality of superimposing terminals 22 are “65” to “67”, the transmission timing of the transmission data is the superimposing terminal 22 with the address “65”, the superimposing terminal 22 with “66”, They are set so as to be shifted by the delay time Tb in the order of the superposition terminal 22 of “67”.
  • the superimposable band starts after a predetermined avoidance time (for example, 300 ⁇ s) Tc from the time when the reply band 104 rises, for example, the superposition terminal 22 whose address number is “N (an integer greater than or equal to 65)” Transmission data is transmitted with a delay of “(N ⁇ 65) ⁇ Tb + Tc” from the rising point.
  • a predetermined avoidance time for example, 300 ⁇ s
  • Tc an integer greater than or equal to 65
  • the superimposition terminal 22 when the superimposition terminal 22 receives the timing synchronization pulse in the transmission band 103 of the transmission signal, it transmits the transmission data by the superimposition signal in the reply band 104 of the same frame. At this time, when a plurality of overlapping terminals 22 having addresses “65” to “68” transmit transmission data, the transmission timing of the transmission data is shifted by a delay time Tb as shown in FIGS. 10A to 10D. Become. That is, the superimposition terminal 22 at address “65” starts transmission of transmission data after “Tc” from the rise of the reply band 104 (FIG. 10A), and the superposition terminal 22 at address “66” starts “Tc + Tb from the rise of the reply band 104.
  • each superimposition terminal 22 cannot transmit the transmission data if another superimposition terminal 22 other than itself is transmitting the transmission data, the superimposition terminal 22 will not transmit the transmission data. Therefore, when the transmission timing of the transmission data is determined in the order of the addresses “65”, “66”, “67”, “68” as described above, the transmission data from the superimposition terminal 22 at the address “65”. Will be given top priority. That is, in the examples of FIGS. 10A to 10D, four transmission data are illustrated for easy understanding of the explanation about the delay time Tb. However, in practice, the superimposition terminal 22 at the address “66” has the address “65”. When the superimposing terminal 22 is transmitting transmission data, transmission data cannot be transmitted.
  • the superimposition terminal 22 at address “67” cannot transmit transmission data when the superimposition terminal 22 at address “65” or “66” is transmitting transmission data, and the superimposition terminal 22 at address “68”. Cannot transmit the transmission data when the superimposition terminal 22 with the address “65”, “66” or “67” is transmitting the transmission data.
  • the superimposition terminal 22 since the superimposition terminal 22 transmits the transmission data at a transmission timing predetermined for each superimposition terminal 22, a plurality of superposition terminals 22 are used without using reservation data. It is possible to avoid overlapping of the transmission timings of the superimposed signals between each other. Therefore, interference (collision) between superimposed signals can be avoided. Further, as compared with a configuration in which transmission data is transmitted after reservation data is transmitted, there are advantages that a time required to transmit the transmission data can be shortened and a time lag until the transmission data is transmitted can be shortened.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Selective Calling Equipment (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Dc Digital Transmission (AREA)

Abstract

Selon l'invention, parmi des signaux de transmission, un terminal de superposition utilise, pour superposer un signal de superposition, une bande de réponse dans laquelle aucune donnée de retour n'est envoyée d'un terminal de communication à une unité de transmission comme une bande superposable adéquate pour superposer des signaux de superposition. Lorsqu'une unité de réception de transmission reçoit, dans une bande de transmission pour un signal de transmission, des données de réserve avec lesquelles l'unité de transmission empêche tous les terminaux de communication d'envoyer des données de retour dans la bande de réponse suivant ladite bande de transmission, une unité de détermination du terminal de superposition détermine que la bande de réponse suivant ladite bande de transmission est une bande superposable. Chaque terminal de superposition comprend une unité de traitement qui, par l'utilisation des données de transmission qui ont été envoyées par un signal de superposition à partir d'un terminal de superposition autre que lui-même, réalise un traitement tel qu'un accusé de réception de survie et de réglage temporel lorsque ledit terminal de superposition reçoit lesdites données de transmission avec une unité de communication de superposition.
PCT/JP2013/002805 2012-04-27 2013-04-25 Système de communication WO2013161302A1 (fr)

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JP2012-103949 2012-04-27
JP2012103949A JP2013232798A (ja) 2012-04-27 2012-04-27 通信システム

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08274742A (ja) * 1995-03-29 1996-10-18 Matsushita Electric Works Ltd 時分割多重伝送システム
JP2008244882A (ja) * 2007-03-27 2008-10-09 Matsushita Electric Works Ltd データ伝送方法
JP2009225328A (ja) * 2008-03-18 2009-10-01 Panasonic Electric Works Co Ltd 中継装置
JP2012244469A (ja) * 2011-05-20 2012-12-10 Panasonic Corp 通信システムおよび重畳モジュール

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08274742A (ja) * 1995-03-29 1996-10-18 Matsushita Electric Works Ltd 時分割多重伝送システム
JP2008244882A (ja) * 2007-03-27 2008-10-09 Matsushita Electric Works Ltd データ伝送方法
JP2009225328A (ja) * 2008-03-18 2009-10-01 Panasonic Electric Works Co Ltd 中継装置
JP2012244469A (ja) * 2011-05-20 2012-12-10 Panasonic Corp 通信システムおよび重畳モジュール

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