WO2016125496A1

WO2016125496A1 - Communications system

Info

Publication number: WO2016125496A1
Application number: PCT/JP2016/000578
Authority: WO
Inventors: 峰宜長坂; 憲一古河
Original assignee: ミツミ電機株式会社; 峰宜長坂; 憲一古河
Priority date: 2015-02-06
Filing date: 2016-02-04
Publication date: 2016-08-11
Also published as: JP2016146532A; JP6531410B2; CN107211397A; CN107211397B

Abstract

A transmitter 10 successively transmits the same transmission data in one transmission operation on at least two channels in a prescribed order at prescribed intervals, receives information indicating the order of transmission channels from a receiver 20 and stores the received information, and notifies the receiver of the current order of transmission channels. The transmitter 10 performs the transmission of the same data on the basis of the order of transmission channels that is initially set or received from the receiver 20 at prescribed intervals while switching the order of channels on which to transmit, and the reception of the information indicating the order of transmission channels from the receiver 20, separately in time.

Description

Communications system

The present invention has a power generation device that converts mechanical energy into electrical energy, transmits a radio signal using the electrical energy as a power source, and receives a radio signal transmitted by the transmitter. A communication system having a receiver.

For example, Patent Document 1 discloses a communication system in which a power generator is provided in a transmitter.

In this type of communication system, the amount of electrical energy regenerated by the power generation device is low, so that [1] there is only the amount stored in the power storage device or the like, or [2] it is finite per hour, and AC There is a restriction that the amount that can be used is limited compared to a power source or a battery.

JP 2013-126161 A

By the way, in a communication system in which a power generation device is provided in a transmitter as described above, usable power is very limited, so it is used to improve communication reliability and transferability in conventional wireless communication. It is not possible to mediate communication such as switching of mutual communication channel by carrier sense by bidirectional communication or retransmission due to unacknowledged ACK, and a predetermined channel using a one-way broadcast method The communication is performed in a fixed manner.

For this reason, even if the channel is not used by other wireless devices when installing wireless devices, and the channel allows good communication, events that occur after installation (such as bringing in mobile phones or installing other communication devices) ) As the time that the channel is occupied increases, there is a sufficiently high risk that communication will be interrupted and will not be achieved. For this reason, some devices have been devised to increase the arrival probability by multiplexing the set channel, but if there is a device in the vicinity that communicates with the channel with a high occupation rate, the effect of improving the arrival probability is certain. It cannot be said that there is.

The present invention has been made in consideration of the above points, and is a system capable of always communicating with a good channel and capable of communicating with limited energy. Provided is a communication system that can increase the reliability of communication without performing a procedure such as sense.

One aspect of the communication system of the present invention is:
A power generation unit that converts mechanical energy into electrical energy, a transmitter that performs wireless transmission using electrical energy obtained by the power generation unit as a power source, and a radio signal transmitted by the transmitter; A communication system comprising:
The transmitter is
In one transmission operation, the same transmission data is sequentially transmitted at intervals determined in an order determined by at least two or more channels.
Receiving and storing information indicating the transmission channel order from the receiver;
Notify the receiver of the current transmission channel order,
Based on the initial setting order or the transmission channel order received from the receiver, the transmission order of the same data and the transmission channel order from the receiver are determined at predetermined intervals while switching the order of the channels to be transmitted. And receive the information shown by time division multiplexing,
The receiver
Memorize the receiving channel number and order,
Receiving and storing the transmission channel number and the transmission channel order notified from the transmitter;
Transmitting information indicating the transmission channel order to the transmitter;
Evaluate whether the receiving channel was regular reception or error reception,
Evaluate the reception quality of each channel,
When an error is received on the set channel, the reception channel is switched according to a preset order, and the transmission channel order of the next transmission is notified to the transmitter from the result of evaluating each channel.

One aspect of the communication system of the present invention is:
A power generation unit that converts mechanical energy into electrical energy, a transmitter that performs wireless transmission using electrical energy obtained by the power generation unit as a power source, and a radio signal transmitted by the transmitter; A one-way communication system comprising:
The transmitter is
In one transmission operation, the same transmission data is sequentially transmitted at intervals determined in an order determined by at least two or more channels.
The receiver
Storing the transmission channel number and transmission channel order of the transmitter;
Evaluate whether the receiving channel was regular reception or error reception,
When it is determined that the reception channel is busy, the reception channel is switched according to a preset order.

One aspect of the communication system of the present invention is:
A power generation unit that converts mechanical energy into electrical energy, a transmitter that performs wireless transmission using electrical energy obtained by the power generation unit as a power source, and a radio signal transmitted by the transmitter; A one-way communication system comprising:
The transmitter is
In one transmission operation, the same transmission data is sequentially transmitted at intervals determined in an order determined by at least two or more channels.
The receiver
Store the same channel number as the transmitter,
Evaluate the quality of the receiving channel,
The reception channel is switched when the quality of the reception channel falls below a predetermined value.

One aspect of the communication system of the present invention is:
A power generation unit that converts mechanical energy into electrical energy, a transmitter that performs wireless transmission using electrical energy obtained by the power generation unit as a power source, and a radio signal transmitted by the transmitter; A one-way communication system comprising:
The transmitter is
In one transmission operation, the same transmission data is sequentially transmitted at intervals determined in an order determined by at least two or more channels.
The receiver
Storing the transmission channel number and transmission channel order of the transmitter;
The timer switches the receiving channel in synchronization with the transmission interval,
The reception channel is switched according to a predetermined sequence, and the multiplex transmission data transmitted from the transmitter is received a plurality of times on different channels.

According to the present invention, communication can always be performed with a good channel and communication can be performed with limited energy, and communication reliability can be increased without performing a complicated procedure such as a conventional carrier sense. A communication system can be realized.

The figure which shows schematic structure of the communication system of embodiment FIG. 2A is a diagram illustrating the principle of communication control method 1, FIG. 2A is a diagram illustrating an operation principle of a transmitter, and FIG. 2B is a diagram illustrating an operation principle of a receiver. The flowchart which shows the transmission processing flow of a transmitter in the communication control method 1. The flowchart which shows the reception processing flow of the receiver in the communication control method 1. Flow chart showing processing flow of reception start interrupt subroutine 6A and 6B are diagrams illustrating the principle of the communication control method 2. FIG. 6A is a diagram illustrating the principle of the initial transmission operation of the transmitter, FIG. 6B is a diagram illustrating the operation principle of the receiver, and FIG. 6C is the principle of the initial transmission operation of the transmitter. Figure showing The flowchart which shows the transmission processing flow of a transmitter in the communication control method 2. The flowchart which shows the reception processing flow of the receiver in the communication control method 2. Flow chart showing processing flow of reception start interrupt subroutine Flow chart showing processing flow of timer interrupt subroutine FIG. 11A is a diagram illustrating the principle of communication control method 3, FIG. 11A is a diagram illustrating the principle of transmission operation of the transmitter, and FIG. 11B is a diagram illustrating the principle of reception operation of the receiver. The flowchart which shows the reception processing flow of the receiver in the communication control method 3. Flow chart showing processing flow of reception start interrupt subroutine Flow chart showing processing flow of timer interrupt subroutine The flowchart which shows the reception processing flow of the receiver in the communication control method 4. Flow chart showing processing flow of reception start interrupt subroutine Flow chart showing processing flow of timer interrupt subroutine

With a limited amount of energy, the transmitting side cannot sense a good channel from a plurality of channels, and the communication channel cannot be arbitrated by the transceiver. Therefore, in this embodiment, the transmitter transmits the same data asynchronously and sequentially in multiple channels set in advance without arbitration with the receiver. We propose a method for switching the channel so that the receiver can make use of sufficient power, detect the reception state, and if the channel is busy, it can be received by another channel.

In the present embodiment, the receiver makes use of sufficient power, detects and evaluates the reception state, receives the signal on the reception channel in the best state, and first transmits to the transmitter with the minimum power (ACK reply). We propose a method of instructing channel (master channel) switching and always having the highest transmission probability.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<Configuration>
FIG. 1 is a diagram illustrating a schematic configuration of a communication system according to an embodiment. The communication system according to the present embodiment is a communication system that performs one-way communication of transmission data from one transmitter 10 having the power generation unit 14 to one or more receivers 20. The communication system of the communication system is a ZigBee wireless system based on IEEE 802.14.5 or a ZigBee Green Power wireless system based on IEEE 802.14.5.

The transmitter 10 performs baseband processing such as encoding and transmission frame configuration by the baseband processing unit 11, performs radio processing such as amplification and up-conversion by the radio transmission unit 12, and transmits a radio signal obtained thereby from the antenna. Send. The operations of the baseband processing unit 11 and the wireless transmission unit 12 are controlled by the transmission control unit 13. The transmitter 10 includes a power generation unit 14 and a power storage unit 15 that convert mechanical energy into electrical energy, and stores the electrical energy obtained by the power generation unit 14 in the power storage unit 15. The electrical energy of the power storage unit 15 is supplied as energy for operating the entire transmitter 10.

The receiver 20 performs radio processing such as amplification and down-conversion on the signal received by the antenna by the radio reception unit 21 and performs demodulation processing such as decoding by the baseband demodulation unit 22. The operations of the radio reception unit 21 and the baseband demodulation unit 22 are controlled by the reception control unit 23.

In the present embodiment, the communication between the transmitter 10 and the receiver 20 is controlled as in any of the communication control methods 1 to 4 described below, thereby improving the normal communication probability with low power consumption. It can be made to.

Incidentally, the power generation unit 14 includes a coil, a permanent magnet, an accumulator that accumulates mechanical energy input from the outside such as a human operation as elastic energy due to deformation of an elastic body such as a spring, and elasticity of the accumulator by a predetermined displacement input. It is possible to adopt a configuration that has a mechanism for releasing energy, the relative displacement of the coil and the permanent magnet is changed by the released energy, and the power is generated by electromagnetic induction by the change of the magnetic flux density passing through the coil. .

The power generation unit 14 is made of a magnetostrictive material, and includes at least one magnetostrictive rod that passes the magnetic lines of force in the axial direction, a beam member that has a function of applying stress to the magnetostrictive rods, and the magnetic lines of force pass in the axial direction. And a coil that generates a voltage based on a change in density thereof, and inputs mechanical energy from the outside, such as a human operation, with respect to one end of the magnetostrictive rod and the axial direction thereof. Displace in a substantially vertical direction and store it as elastic energy in the beam member and magnetostrictive material, release the forced displacement of the other end by a predetermined displacement input, and expand and contract the magnetostrictive rod by the stored elastic energy Therefore, it is possible to adopt a configuration in which a voltage is generated in the coil by changing the density of the lines of magnetic force.

The following terms used in the description of this embodiment have the following meanings.
Master channel (M-ch): Channel that transmitter 10 transmits first. The channel on which the receiver 20 stands by.
Sub channel (S-ch): A channel in which the transmitter 10 sequentially transmits after switching M-ch. Further, the receiver 20 temporarily saves the channel by switching the reception channel. Multiple settings are possible (S1-ch, S2-ch).
SFD (Start Frame Ditect): A reception frame notifying that the start of data reception has been detected.
SFD_INT: A hardware interrupt that occurs when an SFD is received.
LEN: Frame received next to SFD, received data length.
SRC: FCF + SEQ + DES + Source PAN ID (destination address, source address).

<Communication control method 1>
FIG. 2 is a diagram illustrating the principle of the communication control method 1. FIG. 2A shows the operating principle of the transmitter 10, and FIG. 2B shows the operating principle of the receiver 20.

In the communication control method 1, the transmitter 10 defines the same transmission data in at least two or more channels in one transmission operation (meaning one broadcast transmission) as shown in FIG. 2A. Multiplex transmission is performed in which transmission is performed sequentially at intervals determined in order. In the example of FIG. 2A, three channels are multiplexed and broadcast.

As shown in FIG. 2B, the receiver 20 sequentially demodulates the reception channels in a predetermined order. Here, the receiver 20 stores in advance the transmission channel number of the transmitter 10 and the order of reception and demodulation, and sequentially receives and demodulates the channels in the stored order. Further, the receiver 20 evaluates whether the received and demodulated channel is regular reception or error reception, and if it is evaluated as error reception, it immediately switches the reception channel in the order stored in advance. In the example of FIG. 2B, since the other receiver 20 occupies this reception channel in the first reception channel (that is, because it is busy), an error reception occurs in the second reception channel. This is an example in which error reception occurs and normal reception can be performed on the third reception channel. In this way, it is possible to shorten the time until normal reception is performed on any channel and to improve the normal communication probability.

In addition, the evaluation of whether it is regular reception or error reception is judged as error reception when it falls under any of the following 1) to 4), and when it does not fall under any of the following, it is regular reception. Judge that there is.

1) LEN is not the specified length.
2) The destination address and the source address do not correspond to the predetermined setting value or list.
3) The CRC (checksum) of the received data is not True (OK).
4) The protocol, data range, and format of the received data are not within the predetermined range.

FIG. 3 shows a transmission processing flow of the transmitter 10 in the communication control method 1.

The transmitter 10 starts transmission processing in step S10. This transmission process is triggered by a timer, a voltage rise of the power storage unit 15, voltage detection of the power storage unit 15, a sensor signal, an external signal, a switch, or the like.

Transmitter 10 performs initial setting in step S11. Specifically, transmission data preparation, transmission channel rank setting, and transmission count setting are performed. In step S12, a channel to be transmitted this time is set, and in step S13, the channel is transmitted. In step S14, the transmission count value of the transmission counter is incremented. In step S15, it is determined whether or not the number of transmissions (transmission count value) has become larger than the set number. If an affirmative result is obtained in step S15, the process proceeds to step S17 to end the transmission process. If a negative result is obtained in step S15, the process waits for a predetermined time in step S16 and then proceeds to step S12. In this way, the transmitter 10 repeats steps S12-S13-S14-S15-S16-S12, thereby performing one transmission operation (meaning one broadcast transmission) as shown in FIG. 2A. Multiplex transmission is performed in which the same transmission data is sequentially transmitted at intervals determined in an order determined by at least two or more channels.

In other words, the transmitter 10 determines M-ch and S-ch according to a predetermined initial setting, and sequentially transmits at least twice. Here, the transmission interval of each transmission packet is at least (the time required for the receiver to switch the reception channel + the normal frame length) or more.

FIG. 4 shows a reception processing flow of the receiver 20 in the communication control method 1.

When the receiver 20 starts the reception process in step S20, the receiver 20 performs initial setting in step S21. Specifically, the order of receiving channels is acquired and set. The receiver 20 sets the reception channel in step S22, turns on the reception unit (that is, the wireless reception unit 21 and the baseband demodulation unit 22) in step S23, turns on the reception start interrupt in step S24, and in step S25. The reception process ends.

FIG. 5 shows the processing flow of the reception start interrupt subroutine. When the reception start interrupt is turned on in step S24 of FIG. 4, the receiver 20 starts the reception start interrupt subroutine S30 of FIG. 4, turns off the timer interrupt in step S31, and then receives the reception control unit in step S32. It is evaluated whether 23 is regular reception or not. Specifically, the above items 1) to 4) are evaluated.

In step S33, it is determined whether or not an error has been received. Specifically, if the reception control unit 23 corresponds to any one of the items 1) to 4), it is determined that the error is received (step S33; YES), and normal if it does not correspond to any of the items. It is determined that it is received (step S33; NO).

If it is determined in step S33 that the reception is normal, the process proceeds to step S34, where the reception is completed and the demodulated data is stored. In the following step S35, the current channel is set as the channel of rank 1, and the process returns to the main routine (FIG. 4) in step S36.

On the other hand, if it is determined in step S33 that an error has been received, the process proceeds to step S37 to determine whether the set channel is the final rank. If the set channel is not in the final order, the process proceeds to step S38, the reception channel is changed according to the set order, the process proceeds to step S39, the timer interrupt is turned on, and the process returns to the main routine (FIG. 4) in step S36. If the set channel is the final rank, the process proceeds from step S37 to step S40, the reception channel is set to the rank 1 channel, the timer interrupt is turned off in step S41, and the process returns to the main routine (FIG. 4) in step S36. .

As described above, according to the communication control method 1, the transmitter 10 sequentially transmits the same transmission data at intervals determined in an order determined by at least two or more channels in one transmission operation. The receiver 20 stores the transmission channel number and the transmission channel order of the transmitter 10, evaluates whether the reception channel is normal reception or error reception, and determines that the reception channel is busy. The receiving channel is switched according to the order.

This makes it possible to shorten the time required for normal reception on any channel and improve the normal communication probability.

In addition, the transmitter 10 may repeatedly transmit the order determined by two or more channels at least twice.

Also, the frame-to-frame interval (cycle) in the multiplex transmission of the transmitter 10 may be set to the time required for the receiver 20 to switch channels + the time required for receiving a normal frame + the received frame evaluation time or more.

The receiver 20 receives a packet, recognizes a reception interrupt (start of frame) as a trigger, sequentially evaluates information included in the received frame, and evaluates error reception in multiple stages. Good.

In addition, after the receiver 20 switches the reception channel to the set next channel due to error reception, the channel is set to at least (number of set channels + 1) × normal frame time + number of set channels × transmission interval + margin. If no reception interrupt occurs, the reception channel may be returned to the initial channel. Alternatively, when the channel after the channel is set, the channel is switched to that channel, and thereafter, if there is no reception interrupt in the final setting channel, it is preferable to return to the initial channel.

<Communication control method 2>
FIG. 6 is a diagram illustrating the principle of the communication control method 2. 6A shows the principle of the initial transmission operation of the transmitter 10, FIG. 6B shows the operation principle of the receiver 20, and FIG. 6C shows the principle of the initial transmission operation of the transmitter 10.

In communication control method 2, as shown in FIG. 6A, transmitter 10 transmits the same transmission data in one transmission operation (meaning one broadcast transmission) as in communication control method 1 described above. Multiplex transmission is performed in which transmission is performed sequentially at intervals determined in an order determined by at least two or more channels. In the example of FIG. 6A, three channels are multiplexed and broadcast. Each transmission frame includes data and transmission-side PHY information (M-ch and S-ch settings and order).

In addition to this, in the communication control method 2, the transmitter 10 receives an ACK from the receiver 20 after transmitting each transmission frame. The transmission interval of each transmission frame is set to at least the time during which ACK can be received from RX, and in this embodiment, the transmission interval is set to IEEE 802.15.4. After transmitting each transmission frame, the transmitter 10 receives an ACK from the receiver 20, and therefore is in a reception state until the next transmission time.

As shown in FIG. 6B, the receiver 20 sequentially demodulates the reception channels in a predetermined order as in the communication control method 1 described above. Here, the receiver 20 stores the transmission channel number of the transmitter 10 and the order of reception demodulation, and sequentially receives and demodulates the channels in the stored order. Further, the receiver 20 evaluates whether the received and demodulated channel is regular reception or error reception, and if it is evaluated as error reception, it immediately switches the reception channel in the order stored in advance. In the example of FIG. 6B, another receiver 20 occupies this reception channel in the first reception channel (that is, because it is in a busy state), resulting in an error reception. This is an example in which error reception occurs and normal reception can be performed on the third reception channel. Up to this point, the communication control method 1 is the same as described above.

In addition, in the communication control method 2, the receiver 20 evaluates the reception quality of each channel, and when the normal reception is completed, the receiver 20 sends an ACK to the transmitter 10 in the corresponding channel (that is, the channel that has been normally received). By replying, the M-ch of the transmitter 10 is switched.

As a result, as shown in FIG. 6C, at the next transmission, the transmitter 10 performs transmission by increasing the transmission order of the channel to which the ACK is returned. In addition, the receiver 20 sets the channel to which the ACK is returned as the first reception channel and waits for the next reception. That is, the transmitter 10 increases the transmission order of the channel that is likely to be received normally, and the receiver 20 waits for channel reception in the same order. As a result, the processing time required for regular reception can be shortened compared to the communication control method 1, and communication with lower power consumption can be realized.

FIG. 7 shows a transmission processing flow of the transmitter 10 in the communication control method 2.

The transmitter 10 starts transmission processing in step S50. This transmission process is triggered by a timer, a voltage rise of the power storage unit 15, voltage detection of the power storage unit 15, a sensor signal, an external signal, a switch, or the like.

The transmitter 10 performs initial setting in step S51. Specifically, transmission data preparation, transmission channel rank setting, and transmission count setting are performed. In step S52, a channel to be transmitted this time is set, and in step S53, the channel is transmitted. At this time, in addition to the data, transmission-side PHY information (M-ch, S-ch setting and order information) is also transmitted. In the subsequent step S54, the receiving unit is turned on (note that the transmitter 10 does not have a receiving unit in the configuration of FIG. 1, but the transmitter 10 has a receiving unit in order to realize the communication control method 2). The ACK from the receiver 20 is received in step S55.

In step S56, it is determined whether the ACK reception is a timer-out. If it is determined that the ACK is not a timer-out, the process moves to step S57, stores the channel that received the ACK, and changes the transmission order according to the channel that received the ACK in step S58. Then, the changed transmission order is stored. In step S59, the transmission process ends.

On the other hand, if it is determined in step S56 that ACK reception is timer-out, the process proceeds to step S60 to increment the transmission count value of the transmission counter, and in step S61, the number of transmissions (transmission count value) is the set number of times. It is judged whether it became larger than. If an affirmative result is obtained in step S61, the process proceeds to step S59 to end the transmission process. If a negative result is obtained in step S61, the process waits for a predetermined time in step S62 and then proceeds to step S52. In this manner, the transmitter 10 repeats steps S52-S53-S54-S55-S56-S60-S61-S62-S52 to perform one transmission operation (one broadcast) as shown in FIG. 6A. Multiplex transmission and ACK reception operation in which the same transmission data is sequentially transmitted at intervals determined in an order determined by at least two or more channels.

Also, the transmitter 10 sets the channel to which the ACK is returned as the M-ch for the next transmission, and updates the PHY information to notify the switching operation.

FIG. 8 shows a reception processing flow of the receiver 20 in the communication control method 2.

When the receiver 20 starts the reception process in step S70, the receiver 20 performs initial setting in step S71. Specifically, the order of receiving channels is acquired and set. The receiver 20 sets the reception channel in step S72, turns on the reception unit in step S73 and turns on the reception start interrupt, turns on the timer interrupt in step S74, and ends the reception process in step S75. .

FIG. 9 shows the processing flow of the reception start interrupt subroutine. When the reception start interrupt is turned ON in step S73 of FIG. 8, the receiver 20 starts the reception start interrupt subroutine S80 of FIG. 9, and evaluates whether the reception control unit 23 is normal reception in step S81. Specifically, the above items 1) to 4) are evaluated.

In step S82, it is determined whether or not an error has been received. If it is determined in step S82 that the reception is normal, the process proceeds to step S83, where the data reception is completed and the demodulated data is stored.

In the following step S84, the current PHY information and the current reception channel are compared. If it is determined in step S84 that the current PHY information and the current reception channel are not the same, the process proceeds to step S86 and ACK is returned on the current reception channel. On the other hand, when it is determined that the current PHY information and the current reception channel are the same, the process proceeds to step S87 and returns to the main routine (FIG. 8).

If it is determined in step S82 that the error has been received, the process proceeds to step S88 to change the reception channel to the next reception channel according to the setting order. In step S89, the channel order is redetermined, and in step S87, the process returns to the main routine (FIG. 8).

FIG. 10 shows the processing flow of the timer interrupt subroutine. When the timer interrupt is turned on in step S74 of FIG. 8, the receiver 20 starts the timer interrupt subroutine S90 of FIG. 10, measures RSSI (Received Signal Signal Strength Indicator) in step S91, and measures in step S92. The reception channel quality is evaluated based on the RSSI, and the evaluation result is stored. In step S93, channel switching is determined to determine the channel order, and in step S94, the process returns to the main routine (FIG. 8).

As an index for evaluating the quality of the reception channel, RSSI at the time of normal reception, RSSI of the SFD frame at the time of error reception, error occurrence frequency and history of each channel, RSSI in the standby state of each channel, and the like are used. it can. The RSSI at the time of regular reception is a value corresponding to the distance between the transmitter 10 and the receiver 20, the presence or absence of an obstacle, and the larger the RSSI, the better the reception quality. The RSSI of the SFD frame at the time of error reception is a value according to the influence of other devices on the receiver 20, and the reception quality is worse as the RSSI is larger. The RSSI in the standby state of each channel is a value corresponding to the noise around the receiver, and the reception quality is worse as the RSSI is larger.

As described above, according to the communication control method 2, the transmitter 10 sequentially transmits the same transmission data at intervals determined in an order determined by at least two or more channels in one transmission operation. Transmit, receive and store information indicating the transmission channel order from the receiver 20, notify the receiver of the current transmission channel order, and transmit based on the initial setting order or the transmission channel order received from the receiver 20. While switching the channel order, transmission of the same data and reception of information indicating the transmission channel order from the receiver 20 are performed by time-division multiplexing with a predetermined interval.

On the other hand, the receiver 20 stores the reception channel number and the order, receives and stores the transmission channel number and the transmission channel order notified from the transmitter 10, and transmits information indicating the transmission channel order to the transmitter 10, Evaluate whether the reception channel is regular reception or error reception, evaluate the reception quality of each channel, and when receiving error in the set channel, the result of switching the reception channel according to the preset order and evaluating each channel To notify the transmitter of the next transmission channel order.

Also, the transmitter 10 may transmit and receive at least twice the order determined by two or more channels.

In addition, the transmitter 10 maintains the reception state after transmission in a predetermined channel order for a certain period of time, and receives a reception completion notification from the receiver 20 during that time, thereby transmitting the channel to the first transmission at the next transmission. It is good to store as a channel and change the transmission channel order.

In addition, the receiver 20 evaluates the reception quality of each channel by evaluating one or a combination of the evaluation items listed below, and after completing normal reception, returns a reception completion on that channel. The transmitter 10 may be instructed about the next first transmission channel.
-Completion of regular reception on the channel-RSSI (Reception sensitivity) during regular reception
-RSSI (reception sensitivity) of SFD frame at the time of error reception
・ Error frequency and history of each channel

Also, the frame-to-frame interval (cycle) in the multiplex transmission / reception of the transmitter 10 is expressed as follows: time required for the receiver 20 to switch channels + time required for regular frame reception + reception frame evaluation time, or from the receiver 20 It should be more than the reception completion notification.

In addition, the receiver 20 receives some packet and recognizes a reception interrupt (start of frame) as a trigger, sequentially evaluates information included in the received frame, and evaluates error reception in several stages. Good.

<Communication control method 3>
FIG. 11 is a diagram illustrating the principle of the communication control method 3. FIG. 11A shows the principle of the transmission operation of the transmitter 10, and FIG. 11B shows the principle of the reception operation of the receiver 20.

In communication control method 3, as shown in FIG. 11A, transmitter 10 transmits the same transmission data in one transmission operation (meaning one broadcast transmission), as in communication control method 1 described above. Multiplex transmission is performed in which transmission is performed sequentially at intervals determined in an order determined by at least two or more channels. In the example of FIG. 11A, three channels are multiplexed and broadcast.

As shown in FIG. 11B, the receiver 20 sequentially demodulates the reception channels in a predetermined order as in the communication control method 1 described above. Here, reception is continued on the reception channel until the quality of the reception channel becomes lower than a predetermined value, and when the quality of the reception channel becomes lower than the predetermined value, switching to the next reception channel is performed.

The transmission process flow of the transmitter 10 in the communication control method 3 is the same as the transmission process flow (FIG. 3) of the transmitter 10 in the communication control method 1 described above.

FIG. 12 shows a reception processing flow of the receiver 20 in the communication control method 3.

When the receiver 20 starts reception processing in step S100, the receiver 20 performs initial setting in step S101. Specifically, the order of receiving channels is acquired and set. The receiver 20 sets the reception channel in step S102, turns on the reception unit in step S103 and turns on the reception start interrupt, turns on the timer interrupt in step S104, and ends the reception process in step S105. .

FIG. 13 shows the processing flow of the reception start interrupt subroutine. When the reception start interrupt is turned ON in step S103 of FIG. 12, the receiver 20 starts the reception start interrupt subroutine S110 of FIG. 13, acquires (measures) RSSI in step S111, and stores it. In subsequent step S112, the reception control unit 23 evaluates whether or not the reception is normal. Specifically, the above items 1) to 4) are evaluated.

In step S113, it is determined whether an error is received. If it is determined in step S113 that the reception is normal, the process proceeds to step S114 to complete the data reception and store the demodulated data. In the following step S115, the quality of the regular reception channel is evaluated and the evaluation result is stored, and the process returns to the main routine (FIG. 12) in step S116.

If it is determined in step S113 that an error has been received, the process proceeds to step S117, where the quality of the received channel is evaluated and the evaluation result is stored. In the subsequent step S118, channel switching is determined and the channel order is determined. In the following step S119, it is determined whether the channel switching is correct. If it is not correct, the process proceeds to step S116. If it is correct, the reception channel is changed to the next channel in step S120, and then the process proceeds to step S116.

FIG. 14 shows the processing flow of the timer interrupt subroutine. When the timer interrupt is turned on in step S104 in FIG. 12, the receiver 20 starts the timer interrupt subroutine S130 in FIG. 14, and measures and stores the RSSI in step S131. In step S132, the reception channel quality is evaluated based on the RSSI measured in step S131 and the evaluation result is stored. In step S133, channel switching is determined and the channel order is determined. In the following step S134, it is determined whether the channel switching is correct. If it is not correct, the process proceeds to step S135 and returns to the main routine (FIG. 12). If it is correct, the reception channel is changed to the next channel in step S136, and then the process proceeds to step S135.

As described above, the receiver 20 that performs the communication control method 3 detects environmental noise and reception intensity by SFD interruption and timer interruption, and immediately determines that switching of the reception channel is necessary by evaluating channel quality. The receiving channel is switched to S-ch or later according to the evaluation.

As described above, according to the communication control method 3, the transmitter 10 sequentially transmits the same transmission data in one transmission operation at intervals determined in an order determined by at least two or more channels. The receiver 20 stores the same channel number as the transmitter 10, evaluates the quality of the reception channel, and switches the reception channel when the quality of the reception channel becomes a predetermined value or less.

In addition, the receiver 20 measures the signal power received in the channel being set, stores this as reception strength (RSSI), and determines the RSSI when receiving data from the transmitter 10 and the RSSI of the noise signal during standby. It is preferable to perform an operation of switching channels when the difference is equal to or less than a predetermined value.

Further, the receiver 20 permanently stores the RSSI, compares the current transmission probability in the channel being set with the transmission probability history of other channels used in the past, and predicts the effect after channel switching in advance. Whether to switch or not and which channel to switch to may be determined.

Further, the receiver 20 permanently stores a plurality of RSSIs and detected time histories as a pair, and sets the RSSI of the set channel and other channels used in the past as a moving average method, nearest neighbor method, exponential smoothing method or the like. A prediction method such as this may be used alone or in combination to determine whether to switch to a channel.

In the multiplex transmission in which the transmitter 10 sequentially transmits data, the number of multiplex transmissions is at least three, the time required for data transmission for one channel is tT, the transmission interval for multiplex transmission is tD, and the receiver 20 is the channel. By setting tE to be tD + 2 * tT or more when the minimum interval for switching is tE, it is possible to prevent the transmission / reception channels from entering each other and losing reception opportunities.

Also, by setting the number of times of multiplex transmission to at least 4 and making the even-numbered and odd-numbered transmission channels the same, it is possible to generate a reception opportunity for the corresponding channel in at least one reception period.

<Communication control method 4>
The communication control method 4 does not judge that there is no point in waiting because the current reception channel is busy like the communication control method 1 described above. The communication control method 4 improves the probability of normal reception by switching channels when receiving a certain reception and enabling normal reception in a plurality of channels.

The transmission procedure of the transmitter 10 is the same as that of the communication control method 1.

The receiver 20 performs the following processing.
• Set M-ch as the receiving channel according to the preset initial settings.
-Some reception is detected by the SFD interrupt, and the reception channel is maintained for a certain time regardless of whether or not an error is received.
• Wait until the next transmission timing and switch the reception channel.
-Even after S-ch and after S-ch, a predetermined time is waited and the channel is automatically switched.
The waiting time after S-ch and after S-ch is (number of set channels + 1) × frame time + number of set channels × transmission interval + margin.
・ After switching to the final channel, return to M-ch and wait.

FIG. 15 shows a reception processing flow of the receiver 20 in the communication control method 4.

When the receiver 20 starts the reception process in step S140, the receiver 20 performs initial setting in step S141. Specifically, the order of receiving channels is acquired and set. The receiver 20 sets a reception channel in step S142, turns on the reception unit in step S143 and turns on the reception start interrupt, and ends the reception process in step S144.

FIG. 16 shows the processing flow of the reception start interrupt subroutine. When the reception start interrupt is turned on in step S143 in FIG. 15, the receiver 20 starts the reception start interruption subroutine S150 in FIG. 16, turns on the timer interruption in step S151, and then receives the reception control unit in step S152. It is evaluated whether 23 is regular reception or not. Specifically, the above items 1) to 4) are evaluated.

In step S153, it is determined whether an error is received. Specifically, if the reception control unit 23 corresponds to any of the items 1) to 4), it is determined that the error is received (step S153; YES), and if none of the items is satisfied, it is normal. It is determined that it is received (step S153; NO).

If it is determined in step S153 that the reception is normal, the process proceeds to step S154 where the reception is completed and the demodulated data is stored. In step S155, the timer interrupt is turned off. In step S156, the current channel is set as the rank 1 channel, and the process returns to the main routine (FIG. 15) in step S157.

On the other hand, if it is determined in step S153 that an error has been received, the process proceeds to step S157 and returns to the main routine (FIG. 15).

FIG. 17 shows the processing flow of the timer interrupt subroutine. When the timer interrupt is turned on in step S151 in FIG. 16, the receiver 20 starts the timer interrupt subroutine S160 in FIG. 17. In step S161, the receiver 20 determines whether the set channel is the final order. After moving to S162, the reception channel is changed according to the setting order, the timer interrupt is turned on in step S163, and the process returns in step S164. On the other hand, if it is determined in step S161 that the set channel is in the final order, the process proceeds to step S165, the set channel is set to the rank 1 channel, and the timer interrupt is turned off in step S166. In step S164, the process returns.

As described above, according to the communication control method 4, the transmitter 10 sequentially transmits the same transmission data in one transmission operation at intervals determined in an order determined by at least two or more channels. The receiver 20 stores the transmission channel number and the transmission channel order of the transmitter 10, switches the reception channel in synchronization with the transmission interval by a timer, switches the reception channel according to a predetermined sequence, and transmits the transmitter. Multiplex transmission data transmitted from 10 is received multiple times on different channels.

This makes it possible to shorten the time required for normal reception and improve the normal communication probability.

In addition, the receiver 20 measures the signal power received in the channel being set, compares this with a numerical value set in advance as the reception strength (RSSI), and the receiver 20 receives some radio wave and receives it. It is good also as a trigger of a channel switching sequence that RSSI is more than a setting value.

The above-described embodiments are merely examples of implementation in carrying out the present invention, and the technical scope of the present invention should not be interpreted in a limited manner. That is, the present invention can be implemented in various forms without departing from the gist or main features thereof.

The disclosure of the specification, drawings and abstract contained in the Japanese application of Japanese Patent Application No. 2015-022198 filed on February 6, 2015 is incorporated herein by reference.

The present invention includes a power generation unit that converts mechanical energy into electrical energy, a transmitter that performs wireless transmission using the electrical energy obtained by the power generation unit as a power source, and a radio that is transmitted by the transmitter. It is suitable for a communication system having a receiver for receiving a signal.

DESCRIPTION OF SYMBOLS 10 Transmitter 11 Baseband process part 12 Wireless transmission part 13 Transmission control part 14 Power generation part 15 Power storage part 20 Receiver 21 Wireless reception part 22 Baseband demodulation part 23 Reception control part

Claims

A power generation unit that converts mechanical energy into electrical energy, a transmitter that performs wireless transmission using electrical energy obtained by the power generation unit as a power source, and a radio signal transmitted by the transmitter; A communication system comprising:
The transmitter is
In one transmission operation, the same transmission data is sequentially transmitted at intervals determined in an order determined by at least two or more channels.
Receiving and storing information indicating the transmission channel order from the receiver;
Notify the receiver of the current transmission channel order,
Based on the initial setting order or the transmission channel order received from the receiver, the transmission order of the same data and the transmission channel order from the receiver are determined at predetermined intervals while switching the order of the channels to be transmitted. And receive the information shown by time division multiplexing,
The receiver
Memorize the receiving channel number and order,
Receiving and storing the transmission channel number and the transmission channel order notified from the transmitter;
Transmitting information indicating the transmission channel order to the transmitter;
Evaluate whether the receiving channel was regular reception or error reception,
Evaluate the reception quality of each channel,
When an error is received in the set channel, the reception channel is switched according to a preset order, and the transmission channel order of the next transmission is notified to the transmitter from the result of evaluating each channel.
Communications system.
A power generation unit that converts mechanical energy into electrical energy, a transmitter that performs wireless transmission using electrical energy obtained by the power generation unit as a power source, and a radio signal transmitted by the transmitter; A one-way communication system comprising:
The transmitter is
In one transmission operation, the same transmission data is sequentially transmitted at intervals determined in an order determined by at least two or more channels.
The receiver
Storing the transmission channel number and transmission channel order of the transmitter;
Evaluate whether the receiving channel was regular reception or error reception,
When the reception channel is determined to be busy, the reception channel is switched according to a preset order.
Communications system.
A power generation unit that converts mechanical energy into electrical energy, a transmitter that performs wireless transmission using electrical energy obtained by the power generation unit as a power source, and a radio signal transmitted by the transmitter; A one-way communication system comprising:
The transmitter is
In one transmission operation, the same transmission data is sequentially transmitted at intervals determined in an order determined by at least two or more channels.
The receiver
Store the same channel number as the transmitter,
Evaluate the quality of the receiving channel,
Switching the receiving channel when the quality of the receiving channel is below the specified value,
Communications system.
A power generation unit that converts mechanical energy into electrical energy, a transmitter that performs wireless transmission using electrical energy obtained by the power generation unit as a power source, and a radio signal transmitted by the transmitter; A one-way communication system comprising:
The transmitter is
In one transmission operation, the same transmission data is sequentially transmitted at intervals determined in an order determined by at least two or more channels.
The receiver
Storing the transmission channel number and transmission channel order of the transmitter;
The timer switches the receiving channel in synchronization with the transmission interval,
Switch the reception channel according to a predetermined sequence, and receive the multiple transmission data transmitted from the transmitter multiple times on different channels.
Communications system.