WO2013137036A1 - 送信機、それにおける送信方法、送信機から無線信号を受信する受信機およびそれらを備える無線通信システム - Google Patents
送信機、それにおける送信方法、送信機から無線信号を受信する受信機およびそれらを備える無線通信システム Download PDFInfo
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- 238000004891 communication Methods 0.000 title claims description 119
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- 102220476551 NF-kappa-B inhibitor alpha_S36A_mutation Human genes 0.000 description 3
- 102220534543 Pseudouridylate synthase 7 homolog-like protein_S35A_mutation Human genes 0.000 description 3
- 102200044883 rs121913228 Human genes 0.000 description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0006—Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
- H04W52/0245—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal according to signal strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to a transmitter, a transmission method therefor, a receiver that receives a radio signal from the transmitter, and a radio communication system including them.
- a radio device receives a radio frame.
- the transmitter detects the change in the frame length or amplitude of the radio frame and treats the detected change in the frame length or amplitude as information, so that the transmitter transmits a radio signal corresponding to a certain identifier, and the receiver transmits the identifier.
- the receiver transmits the identifier.
- the transmitter-side radio is equipped with a synchronous detection circuit.
- Carrier sense by CSMA / CA Carrier Sense Multiple Access with Collision Detection
- CSMA / CA Carrier Sense Multiple Access with Collision Detection
- the wireless device that receives the wireless frame demodulates and decodes the wireless LAN frame into payload data by a wireless interface equipped with synchronous detection in the case of normal wireless LAN communication processing.
- the signal whose band is limited by the RF filter is an envelope that is an asynchronous detection for the purpose of simplifying the circuit scale and processing and reducing the power consumption. Received by detection.
- a signal whose band is limited by an RF filter is converted into an intermediate frequency signal or a baseband signal, and the band is limited to a desired bandwidth by applying a narrower band filter at the converted frequency. Then, since frequency conversion is not performed, a signal having a frequency bandwidth corresponding to the characteristics of the RF filter is observed.
- RF filters that pass through the 2.4 GHz ISM band are widely distributed so that they can cover the entire band of the ISM band (channel CH1 to channel CH14 (about 100 MHz width)). Adding a bandpass filter is not practical in terms of price and mounting area.
- Patent Document 1 a system that uses the presence or absence of a wireless frame or a change in the amplitude of a wireless frame as a control identifier has been known.
- Patent Document 2 JP 2009-055533 A JP 2009-077375 A E. H. Armstrong, “Some recent developments of regenerative circuits,” Proc. Inst. Radio Eng., Vol. 10, pp. 244-260, Aug. 1922.
- Patent Documents 1 and 2 since an interference wave from another channel is not taken into consideration, when there is an interference wave from another channel, the wireless device to be shifted from the sleep state to the activation state is activated. There is a problem of not moving to. That is, when there is an interference wave, there is a problem that it is difficult to accurately control the wireless device.
- the present invention has been made to solve such a problem, and an object of the present invention is to provide a transmitter capable of desired control even when an interference wave exists.
- Another object of the present invention is to provide a transmission method capable of desired control even when an interference wave exists.
- Another object of the present invention is to provide a receiver that receives a radio signal from a transmitter capable of desired control even when an interference wave exists.
- Another object of the present invention is to provide a radio communication system capable of desired control even when an interference wave exists.
- the transmitter performs carrier sense, transmits a radio signal when the radio communication space is vacant, and waits for transmission of the radio signal when the radio communication space is not vacant.
- a transmitter for transmitting a radio frame according to a scheme comprising carrier sense means and transmission means.
- the carrier sense means performs carrier sense in a desired frequency band including a plurality of frequency channels.
- the transmitting means has one or more signal detection intervals in which the time interval between the detection timings of the radio frames in the receiving wireless device represents an identifier.
- One radio frame is transmitted in a desired frequency band so as to constitute one or a plurality of signal detection intervals, and when the wireless communication space is not free as a result of carrier sense, one radio frame is waited for transmission.
- the transmission processing to be performed is executed every time carrier sense is performed.
- the transmission method performs carrier sense, transmits a radio signal when the radio communication space is vacant, and waits for radio signal transmission when the radio communication space is not vacant.
- a transmission method for transmitting a radio frame according to a radio communication method wherein a first step of performing carrier sense in a desired frequency band including a plurality of frequency channels and reception when a radio communication space is free as a result of carrier sense
- One radio frame has a desired frequency so as to constitute one or more signal detection intervals of one or more signal detection intervals in which the time interval between the detection timings of the radio frames in the previous radio apparatus represents an identifier
- the transmission processing for waiting for transmission of one wireless frame is performed.
- a second step of executing each performing Athens When the wireless communication space is not free as a result of carrier sense, the transmission processing for waiting for transmission of one wireless frame is performed. And a second step of executing each performing Athens.
- the receiver includes a filter, a detection means, a conversion means, and a control means.
- the filter passes the received signal of the radio frame with a desired bandwidth including a plurality of frequency channels.
- the detection means detects the received signal that has passed through the filter.
- the conversion means samples the detection result by the detection means at a sampling period and converts the detection result into a digital signal sequence.
- the control means performs desired control when one or more signal detection intervals detected based on the digital signal sequence match the identifier.
- the wireless communication system includes the transmitter according to any one of claims 1 to 5 and the transmitter according to any one of claims 11 to 13. Receiver.
- the time interval between the detection timings of the radio frames in the receiving radio apparatus is one of the one or more signal detection intervals representing the identifier.
- One radio frame is transmitted in a desired frequency band so as to constitute one or a plurality of signal detection intervals, and when the radio communication space is not available, the radio frame transmission is waited.
- a wireless device other than the transmitter transmits a wireless frame.
- the receiving wireless device receives a wireless frame from the transmitter when the wireless communication space is available, and receives a wireless frame from a wireless device other than the transmitter when the wireless communication space is not available.
- the one or more signal detection intervals detected based on the received signal of the radio frame received from the transmitter and the radio device other than the transmitter match the identifier, Take control.
- the time interval between the detection timings of the radio frames in the receiving radio apparatus is one or more signal detection intervals representing the identifier.
- One radio frame is transmitted in a desired frequency band so as to constitute one or a plurality of signal detection intervals, and when the radio communication space is not free, transmission of the radio frame is awaited.
- the receiver according to the embodiment of the present invention converts the detection result of the received signal that has passed through the bandwidth including a plurality of frequency channels into a digital signal sequence, and 1 detected based on the converted digital signal sequence.
- the desired control is performed when one or more signal detection intervals coincide with the identifier.
- one or more signal detection intervals are detected based on at least one of a received signal from the transmitter and a received signal from a wireless device other than the transmitter, and the detected one or more signals When the detection interval matches the identifier, the desired control is performed.
- FIG. 4 is a circuit diagram of the matching circuit shown in FIG. 3. It is a conceptual diagram of a frequency band. It is a conceptual diagram of the signal detection interval showing ID of a receiver. It is a figure for demonstrating the transmission method of the radio
- FIG. 6 is a schematic diagram illustrating still another configuration of the receiver illustrated in FIG. 1.
- FIG. 20 is a schematic diagram illustrating a configuration of the synchronous detection circuit illustrated in FIG. 19. It is a flowchart which shows the other operation
- FIG. 6 is a schematic diagram illustrating a configuration of a wireless communication system according to a second embodiment. It is the schematic which shows the structure of the receiver shown in FIG. It is a flowchart which shows the operation
- FIG. 6 is a schematic diagram illustrating a configuration of a wireless communication system according to a third embodiment.
- FIG. 26 is a schematic diagram illustrating a configuration of a transmitter illustrated in FIG. 25.
- FIG. 26 is a schematic diagram illustrating a configuration of a receiver illustrated in FIG. 25.
- FIG. 26 is a schematic diagram illustrating a configuration of a server illustrated in FIG. 25. It is a flowchart which shows the operation
- FIG. 1 is a schematic diagram of a radio communication system according to Embodiment 1 of the present invention.
- a wireless communication system 10 according to Embodiment 1 of the present invention includes a transmitter 1 and a receiver 2.
- a radio frame is transmitted to the receiver 2 in a desired frequency band including the channel.
- the desired frequency band is, for example, an ISM band.
- the CSMA / CA wireless communication system is a wireless communication system that performs carrier sense, transmits a radio signal when the wireless communication space is free, and waits for transmission of the wireless signal when the wireless communication space is not available. To tell.
- the receiver 2 receives a radio frame from the transmitter 1 in a desired frequency band including a plurality of frequency channels, and transitions from the sleep state to the activated state when the received radio frame matches its own ID.
- FIG. 2 is a schematic diagram showing the configuration of the transmitter 1 shown in FIG. With reference to FIG. 2, the transmitter 1 includes a host system 11, a wireless interface 12, and an antenna 13.
- the host system 11 holds the ID of the receiver 2.
- the host system 11 uses the wireless interface 12 so that the signal detection interval indicating the ID of the held receiver 2 is detected by the receiver 2. Control transmission timing of radio frame.
- the wireless interface 12 performs carrier sense via the antenna 13 according to the control from the host system 11 and outputs the carrier sense result to the host system 11.
- the wireless interface 12 transmits a wireless frame to the receiver 2 via the antenna 13 at a transmission timing controlled by the host system 11.
- the host system 11 includes a carrier sense result acquisition unit 111 and a transmission timing control unit 112.
- the carrier sense result acquisition unit 111 controls the wireless interface 12 to perform carrier sense. Further, the carrier sense result acquisition unit 111 receives the carrier sense result from the wireless interface 12 and outputs the received carrier sense result to the transmission timing control unit 112.
- the transmission timing control unit 112 receives the carrier sense result from the carrier sense result acquisition unit 111, performs transmission control based on the received carrier sense result, and performs wireless control in the wireless interface 12 based on the ID of the receiver 2.
- the transmission timing of the frame is controlled and it is determined that the wireless communication space is vacant based on the result of carrier sense in the time zone in which the wireless frame is desired to be transmitted, the wireless frame is transmitted. Further, the transmission timing control unit 112 does not transmit the radio frame in the radio interface 12 when it is determined that the radio communication space is not free based on the result of the carrier sense in the time zone in which the radio frame is desired to be transmitted.
- FIG. 3 is a schematic diagram showing the configuration of the receiver 2 shown in FIG.
- the receiver 2 includes an antenna 21, a broadband RF filter 22, a switch 23, terminals 24 and 25, an envelope detection circuit 26, a signal detection circuit 27, a matching circuit 28, A control circuit 29, a wireless interface 30, and a host system 31 are included.
- the broadband RF filter 22 is connected between the antenna 21 and the switch 23.
- the terminal 24 is connected to the envelope detection circuit 26.
- the terminal 25 is connected to the wireless interface 30.
- the broadband RF filter 22 receives a reception signal of a radio frame via the antenna 21 and outputs only the reception signal included in a desired frequency band to the switch 23 among the received reception signals.
- the switch 23 is connected to the terminal 24 or the terminal 25 according to the control from the control circuit 29. More specifically, the switch 23 is connected to the terminal 24 when it receives an L (logic low) level signal from the control circuit 29. Further, the switch 23 is connected to the terminal 25 when it receives an H (logic high) level signal from the control circuit 29. The switch 23 receives the received signal from the wideband RF filter 22 and outputs the received signal to the envelope detection circuit 26 or the wireless interface 30.
- the envelope detection circuit 26 receives the received signal from the switch 23 via the terminal 24, detects the received signal by envelope detection, and outputs the detected envelope to the signal detection circuit 27.
- the signal detection circuit 27 receives the envelope from the envelope detection circuit 26. Then, the signal detection circuit 27 samples the envelope at the sampling period and converts it into a digital signal sequence, and outputs the converted digital signal sequence to the matching circuit 28.
- the matching circuit 28 receives the sampling result from the signal detection circuit 27 and determines whether or not the received signal received by the receiver 2 matches the ID of the receiver 2 based on the received sampling result.
- the matching circuit 28 outputs a signal consisting of “1” to the control circuit 29 when the received signal received by the receiver 2 matches the ID of the receiver 2, and the received signal received by the receiver 2 is received.
- a signal consisting of “0” is output to the control circuit 29.
- the signal consisting of “1” is a signal indicating that the ID of the receiver 2 has been received
- the signal consisting of “0” is a signal indicating that the ID of the receiver 2 has not been received. .
- control circuit 29 When the control circuit 29 receives the H level signal from the matching circuit 28, the control circuit 29 shifts the wireless interface 30 and the host system 31 from the sleep state to the start state. Then, the control circuit 29 outputs an H level signal to the switch 23.
- control circuit 29 maintains the sleep state of the wireless interface 30 and the host system 31.
- control circuit 29 switches the wireless interface 30 and the host system 31 when the host system 31 detects that the wireless communication is not performed for a certain period of time when the wireless interface 30 and the host system 31 are in the activated state. A transition is made from the activated state to the sleep state, and an L level signal is output to the switch 23.
- the wireless interface 30 shifts from the sleep state to the start state according to the control from the control circuit 29, or shifts from the start state to the sleep state.
- the wireless interface 30 receives a received signal from the switch 23 via the terminal 25, demodulates and decodes the received signal, and outputs the received signal to the host system 31. Further, when receiving a transmission signal from the host system 31, the wireless interface 30 modulates the received transmission signal and transmits the modulated transmission signal via the terminal 25, the switch 23, the broadband RF filter 22, and the antenna 21.
- the host system 31 shifts from the sleep state to the start state according to the control from the control circuit 29, or shifts from the start state to the sleep state. In addition, the host system 31 receives a signal from the wireless interface 30. Further, the host system 31 generates a transmission signal and outputs the generated transmission signal to the wireless interface 30.
- the wireless interface 30 and the host system 31 stop operating, and the broadband RF filter 22, the envelope detection circuit 26, the signal detection circuit 27, the matching circuit 28, and the control circuit 29 operate.
- the state in which the wideband RF filter 22, the envelope detection circuit 26, the signal detection circuit 27, the matching circuit 28, the control circuit 29, the wireless interface 30 and the host system 31 are operating is referred to as “sleep state”. Say state.
- the receiver 2 is connected to the envelope detection circuit 26 via a wideband RF filter instead of the antenna 21 and the wideband RF filter 22, without the switch 23 and the terminals 24 and 25. And an antenna connected to the wireless interface 30 via a broadband RF filter.
- FIG. 4 is a circuit diagram of the matching circuit 28 shown in FIG.
- matching circuit 28 includes flip-flops 41 to 4i (i is a positive integer), 51 to 5j (j is a positive integer), p1 to pk (p is the ID of receiver 2) An integer equal to the number of signal detection intervals to be performed, k is a positive integer), and AND circuits 61 to 6p.
- the flip-flops 41 to 4i, 51 to 5j,..., P1 to pk are connected in series. Each of the flip-flops 41 to 4i, 51 to 5j,..., P1 to pk operates in synchronization with the clock CLK. Note that the cycle of the clock CLK is the same as the sampling cycle T in the receiver 2.
- the flip-flops 41 to 4i, 51 to 5j,..., P1 to pk-1 receive signals from the flip-flops 42 to 4i, 51, 52 to 5j,.
- the flip-flop pk receives a digital signal from the signal detection circuit 27.
- the flip-flops 42 to 4i, 51 to 5j,..., P1 to pk hold the signal for one cycle of the clock CLK, and the held signals are flip-flops 41 to 4i-1, 4i, 51 to, respectively. 5j-1, 5j,..., P1 to pk-1.
- the flip-flop 41 outputs a signal to the AND circuit 61
- the flip-flop 51 also outputs a signal to the AND circuit 62.
- the flip-flop circuit p1 sends the signal to the AND circuit 6p. Output.
- the AND circuit 61 calculates a logical product of the signal from the flip-flop 41 and the signal from the AND circuit 62, and outputs the calculation result to the control circuit 29.
- the AND circuit 62 calculates the logical product of the signal from the flip-flop 51 and the signal from the AND circuit 63 (not shown), and outputs the calculation result to the AND circuit 61.
- the AND circuit 6p calculates the logical product of the signal from the flip-flop p1 and the signal from the signal detection circuit 27, and outputs the calculation result to the AND circuit 6p-1 (not shown). .
- the flip-flops 41 to 4i detect a time interval corresponding to the first signal detection interval among the plurality of signal detection intervals constituting the ID
- the flip-flop 51 ⁇ 5j detect a time interval corresponding to the second signal detection interval among a plurality of signal detection intervals constituting the ID.
- the flip-flops p1 to pk are connected to the plurality of signal detection intervals constituting the ID. Among the signal detection intervals, a time interval corresponding to the last signal detection interval is detected.
- FIG. 5 is a conceptual diagram of the frequency band.
- frequency band BW is a frequency band of the ISM band.
- the frequency band BW includes channels CH1 to CH14.
- the spectrum SP1 is a spectrum of a desired wave
- the spectrum SP2 is a spectrum other than the desired wave of another channel.
- the frequency band BW is a frequency band including a plurality of frequency channels.
- Transmitter 1 performs carrier sense in the frequency band of channel CH1, and transmits a radio frame if the frequency band of channel CH1 is empty.
- the wideband RF filter 22 shown in FIG. 3 allows a signal in the frequency band BW to pass through among the radio signal reception signals. Therefore, the receiver 2 receives a radio frame transmitted by a channel CH9 different from the channel CH1 in addition to the radio frame transmitted by the transmitter 1.
- FIG. 6 is a conceptual diagram of a signal detection interval representing the ID of the receiver 2.
- the ID of the receiver 2 includes, for example, a pattern [S 1 S 2 S 3 ] of three signal detection intervals S 1 , S 2 , S 3 . If the sampling period of the envelope in the receiver 2 is T, the signal detection interval S 1 is composed of 2T, the signal detection interval S 2 consists of 3T, the signal detection interval S 3 consists of 4T. Note that the sampling period T is, for example, 500 ⁇ s.
- the ID of the receiver 2 is represented by k ⁇ 1 signal detection intervals S 1 to S k ⁇ 1 .
- mn ⁇ 1 IDs shown in Table 1 are detected. It can be represented by the intervals S 1 to S n ⁇ 1 .
- the ID of the receiver 2 that is to be shifted from the sleep state to the active state is represented by one of the mn-1 IDs shown in Table 1.
- FIG. 7 is a diagram for explaining a method of transmitting a radio frame in the transmitter 1 shown in FIG.
- FIG. 7 (a) shows the detection timing of the signal detection interval in the receiver 2
- FIG. 7 (b) shows the transmission control reference timing of the radio frame in the transmitter 1.
- the ID of the receiver 2 includes the signal detection interval pattern [S 1 S 2 S 3 ] described above.
- Transmitter 1 by detecting that the receiver 2 is the received signal at the detection timing DT1 ⁇ DT4 is "1", the signal detection interval of 2T S 1, 3T signal detection interval S 2, and 4T signals so as to detect the detection interval S 3, sequentially transmits four radio frames FR1 ⁇ FR4.
- the transmitter 1 transmits a radio frame FR1 having a frame length of T. Then, the transmitter 1 sets the transmission end time of the radio frame FR1 as the transmission reference time of the radio frames FR2 to FR4 (see FIG. 7B).
- the receiver 2 can detect that the received signal is “1” at the detection timing DT1 by receiving the radio frame FR1. As a result, the reference for detecting the signal detection intervals S 1 , S 2 , S 3 is determined.
- the transmitter 1 transmits the radio frame FR2 so that the receiver 2 can detect that the received signal is “1” at the detection timing DT2. That is, the transmitter 1 attempts to transmit the radio frame FR2 before the transmission control reference timing for the transmission preliminary time d, and transmits the radio frame FR2 so as to straddle the detection timing DT2.
- the transmission preliminary time d is, for example, 100 ⁇ s.
- the transmitter 1 sequentially transmits the radio frames FR3 and FR4 in the same manner (see (b) of FIG. 7).
- FIG. 8 is a flowchart showing a radio frame transmission method in the transmitter 1. Note that the flowchart shown in FIG. 8 is a flowchart executed in lower layers (MAC layer and physical layer).
- the carrier sense result acquisition unit 111 controls the radio interface 12 to perform carrier sense, and the radio interface 12 performs carrier sense in the frequency band of the channel CH1 (step S2), and the result of the carrier sense. Is output to the carrier sense result acquisition unit 111.
- the carrier sense result acquisition unit 111 outputs the received carrier sense result to the transmission timing control unit 112.
- the transmission timing control unit 112 determines whether or not the frequency band of the channel CH1 is vacant based on the carrier sense result received from the carrier sense result acquisition unit 111 (step S3).
- steps S2 and S3 are repeatedly executed. That is, the transmitter 1 waits for transmission of a radio frame.
- the transmission timing control unit 112 controls the wireless interface 12 to transmit a wireless frame having a frame length of T, and the wireless interface 12 transmits a radio frame via the antenna 13 according to the control from the transmission timing control unit 112 (step S4).
- the transmission timing control unit 112 determines whether or not t ⁇ y ⁇ Td (step S9). If it is determined in step S9 that t ⁇ y ⁇ Td, the transmission timing control unit 112 further determines whether or not t ⁇ y (step S10). If it is determined in step S10 that t ⁇ y, the series of operations proceeds to step S15.
- the carrier sense result acquisition unit 111 controls the radio interface 12 to perform carrier sense, and the radio interface 12 is, for example, the frequency band of the channel CH1. Then, carrier sense is performed (step S11), and the result of the carrier sense is output to the carrier sense result acquisition unit 111.
- the carrier sense result acquisition unit 111 receives the carrier sense result from the wireless interface 12 and outputs the received carrier sense result to the transmission timing control unit 112.
- the transmission timing control unit 112 determines whether or not the frequency band of the channel CH1 is vacant based on the carrier sense result received from the carrier sense result acquisition unit 111 (step S12).
- steps S11 and S12 are repeatedly executed. That is, the transmitter 1 waits for transmission of a radio frame.
- YTd is timing t2 (see FIG. 7B). Therefore, determining whether or not t ⁇ y ⁇ Td in step S9 corresponds to determining whether or not the timer time t has reached the timing t2. Then, determining that t ⁇ y ⁇ Td corresponds to determining that the timing for transmitting the radio frame FR2 has been reached.
- YTd is timing t4 (see FIG. 7B). Accordingly, when the timer time t reaches the timing t4 and the transmission control reference timing t3 has not elapsed, the radio frame FR3 is transmitted (“YES” in step S9, “NO” in step S10, steps S11 to S11). (See step S14).
- the radio frame FR4 is transmitted in the same manner.
- radio frame FR1 has a frame length of T
- radio frame FR2 to FR4 has a frame length of yt.
- FIG. 9 is a diagram for explaining another method of transmitting a radio frame in the transmitter 1 shown in FIG.
- FIG. 9 (a) shows the detection timing of the signal detection interval in the receiver 2
- FIG. 9 (b) shows the transmission control reference timing of the radio frame in the transmitter 1.
- the ID of the receiver 2 is composed of the signal detection interval pattern [S 1 S 2 S 3 ] described above.
- Transmitter 1 by detecting that the receiver 2 is the received signal at the detection timing DT1 ⁇ DT4 is "1", the signal detection interval of 2T S 1, 3T signal detection interval S 2, and 4T signals so as to detect the detection interval S 3, sequentially transmits four radio frames FR1 ⁇ FR4.
- the transmitter 1 when a time corresponding the transmitted reference time signal detection interval S 1 of 2T elapses, transmits a radio frame FR2. Furthermore, the transmitter 1, when a time corresponding the transmission start time of the radio frame FR2 the signal detection interval S 2 of 3T has elapsed, transmits a radio frame FR3. Furthermore, the transmitter 1, when a time corresponding the transmission start time of the radio frame FR3 the signal detection interval S 3 of 4T has elapsed, transmits a radio frame FR4 (see FIG. 9 (b)).
- the receiver 2 can detect that the received signal is “1” at the detection timings DT1 to DT4 by receiving the radio frames FR1 to FR4, respectively. As a result, signal detection intervals S 1 , S 2 and S 3 are detected.
- Each of the radio frames FR1 to FR4 has a frame length of T + M or more.
- the radio frames FR1 to FR4 are transmitted across the detection timings DT1 to DT4 in the receiver 2, respectively. 2 can stably detect three signal detection intervals S 1 , S 2 , S 3 .
- FIG. 10 is a flowchart showing another method for transmitting a radio frame in the transmitter 1. Note that the flowchart shown in FIG. 10 is a flowchart executed in an upper layer (application layer).
- step S24 If it is determined in step S24 that the timer time t is equal to or greater than the signal detection interval S i , the radio frame FR2 is transmitted (step S25).
- step S22 the radio frame FR1 shown in FIG. 9B is transmitted.
- step S24 S25 to the first time, the time corresponding the transmission start time of the radio frame FR1 the signal detection interval S 1 is passed, the radio frame FR2 is transmitted (in see FIG. 9 (b) ).
- the radio frame FR3 is transmitted (in see FIG. 9 (b) ).
- step S24, S25 and a third time the time corresponding the transmission start time of the radio frame FR3 the signal detection interval S 3 has elapsed, the radio frame FR4 is transmitted (in see FIG. 9 (b) ).
- the flowchart shown in FIG. 10 is executed in the upper layer (application layer) as described above, a step of performing carrier sense and a step of determining whether or not the wireless communication space is free as a result of the carrier sense,
- the upper layer (application layer) of the transmitter 1 transmits the radio frame in step S25
- the lower layer (MAC layer and physical layer) of the transmitter 1 performs carrier sense.
- the wireless frame is transmitted when the wireless communication space is vacant, and the transmission of the wireless frame is waited when the wireless communication space is not vacant.
- the transmitter 1 transmits a radio frame when the radio communication space is free, and waits for transmission of the radio frame when the radio communication space is not empty. .
- FIG. 11 is a conceptual diagram of radio signals and envelopes.
- the broadband RF filter 22 of the receiver 2 receives a reception signal of a radio frame via the antenna 21, and among the received reception signals, the reception signal RF of the frequency band BW described above (see (a) of FIG. 11). Is output to the envelope detection circuit 26 via the switch 23 and the terminal 24.
- the envelope detection circuit 26 performs envelope detection on the received signal RF and outputs the envelope EVL (see FIG. 11B) to the signal detection circuit 27.
- the signal detection circuit 27 samples the envelope EVL at a sampling period T and converts the envelope EVL into a digital signal. Then, the signal detection circuit 27 outputs a digital signal to the matching circuit 28.
- FIG. 12 is a circuit diagram showing a specific example of the matching circuit 28.
- the matching circuit 28 is made up of a matching circuit 28-1 shown in FIG.
- matching circuit 28-1 includes flip-flops 41, 42, 51 to 53, p1 to p4, and AND circuits 61 to 63.
- the flip-flops 41, 42, 51 to 53, and p1 to p4 are connected in series.
- Flip-flops 41, 42, 51 to 53, and p1 to p3 receive signals from flip-flops 42, 51 to 53, and p1 to p4, respectively, and receive the received signals as AND circuit 61 and flip-flops 41, 42, and 51, respectively.
- the flip-flop 51 also outputs a signal to the AND circuit 62
- the flip-flop p1 also outputs a signal to the AND circuit 63.
- the flip-flop p4 receives a signal from the signal detection circuit 27 and outputs the received signal to the flip-flop p3.
- the AND circuit 61 calculates the logical product of the signal from the flip-flop 41 and the signal from the AND circuit 62, and outputs the calculation result to the control circuit 29.
- the AND circuit 62 calculates the logical product of the signal from the flip-flop 51 and the signal from the AND circuit 63 and outputs the calculation result to the AND circuit 61.
- the AND circuit 63 calculates a logical product of the signal from the flip-flop p1 and the signal from the signal detection circuit 27 and outputs the calculated logical product to the AND circuit 62.
- the signal detection circuit 27 samples the envelope EVL at the detection timing DT1, and matches the signal consisting of “1” with the matching circuit 28. To ⁇ 1 (see FIG. 7A).
- the signal detection circuit 27 samples the envelope EVL at the sampling period T and outputs a signal consisting of “0” to the matching circuit 28-1 (see FIG. 7A).
- the signal detection circuit 27 outputs a signal consisting of “1” at the detection timing DT2 to the matching circuit 28-1, and at two sampling timings between the detection timing DT2 and the detection timing DT3, the signal detection circuit 27 starts from “0”. Is output to the matching circuit 28-1 (see FIG. 7A).
- the signal detection circuit 27 outputs a signal composed of “1” at the detection timing DT3 to the matching circuit 28-1, and is composed of “0” at three sampling timings between the detection timing DT3 and the detection timing DT4.
- the signal is output to the matching circuit 28-1, and a signal consisting of “1” is output to the matching circuit 28-1 at the detection timing DT4 (see FIG. 7A).
- the matching circuit 28-1 receives the digital signal sequence [101001001] from the signal detection circuit 27.
- the flip-flops 41, 42, 51 to 53, and p1 to p4 are set to “1” and “0”, respectively. ”,“ 1 ”,“ 0 ”,“ 0 ”,“ 1 ”,“ 0 ”,“ 0 ”,“ 0 ”are output.
- the signal composed of “1” output from the flip-flop 41 represents that the signal detected at the detection timing DT1 is “1”
- the signal composed of “1” output from the flip-flop 51 represents the detection timing.
- the signal detected at DT2 is “1”
- the signal consisting of “1” output from the flip-flop p1 indicates that the signal detected at the detection timing DT3 is “1”.
- a signal composed of “1” input to the p4 and the AND circuit 63 represents that the signal detected at the detection timing DT4 is “1”.
- Input to the control circuit 29 is a plurality of detection timings DT1 to DT1 for detecting a plurality of signal detection intervals S 1 , S 2 , S 3 representing the identifier of the receiver 2 based on the digital signal sequence [101001001]. This corresponds to determining that a signal consisting of “1” is detected in all DT4.
- the flip-flop 41 detects a signal detection interval S 1 of 2T
- flip-flops 51-53 detects a signal detection interval S 2 of 3T
- flip flops p1 ⁇ p4 the signal detection interval of 4T and detects the S 3
- all the p1 outputs a signal consisting of "1”
- the flip-flop 41 and 51 "when all the p1 has output a signal consisting of” 1 "1 "Is input to the control circuit 29 is that a plurality of signal detection intervals S 1 , S 2 , S 3 detected based on the digital signal sequence [101001001] received from the signal detection circuit 27 are received by the receiver. This corresponds to the identifier of 2.
- FIG. 13 is a conceptual diagram of a received signal in asynchronous detection.
- asynchronous detection a plurality of received signals of a plurality of radio frames transmitted through a plurality of channels are detected by being overlapped.
- the receiver 2 receives a radio frame transmitted from the transmitter 1 and a radio frame transmitted from a radio device other than the transmitter 1.
- the signal consisting of “1” detected at the detection timings DT1 to DT4 shown in FIG. 7 may not be based on the radio frame transmitted from the transmitter 1. It may be based on a wireless frame transmitted from any wireless device other than the transmitter 1.
- the signal detection circuit 27 detects a signal consisting of “1” if there is a radio frame reception signal at the detection timings DT1 to DT4, and at the detection timings DT1 to DT4. If there is no radio frame reception signal, it is meaningful to detect a signal consisting of “0” and receiving a signal consisting of “1”.
- FIG. 14 is a conceptual diagram when receiving radio frames from a plurality of channels.
- transmitter 1 transmits a radio frame on channel CH1, for example
- receiver 2 receives a plurality of radio frames transmitted on channels CH1, CH6, and CH11, for example. .
- the radio frame straddling the detection timing DT1 in the receiver 2 is formed by superimposing the radio frame transmitted on the channel CH1 and the radio frame transmitted on the channel CH6.
- the radio frame straddling the detection timing DT2 in the receiver 2 is obtained by superimposing the radio frame transmitted on the channel CH1, the radio frame transmitted on the channel CH6, and the radio frame transmitted on the channel CH11. Become.
- the radio frame straddling the detection timing DT3 in the receiver 2 is formed by superimposing the radio frame transmitted on the channel CH6 and the radio frame transmitted on the channel CH11.
- the radio frame straddling the detection timing DT4 in the receiver 2 is obtained by superimposing the radio frame transmitted on the channel CH1, the radio frame transmitted on the channel CH6, and the radio frame transmitted on the channel CH11. Become.
- the wireless frame transmitted by the hidden terminal can be used as a wireless frame for detecting the ID of the receiver 2.
- FIG. 15 is a flowchart showing an operation of shifting the receiver 2 from the sleep state to the activated state in the wireless communication system 10.
- transmitter 1 transmits a plurality of radio frames according to the flowchart shown in FIG. 8 or 10 (step S31). ).
- the broadband RF filter 22 of the receiver 2 receives the radio frame via the antenna 21 (step S32), and passes the signal having the frequency band BW among the received signals of the received radio frame, and passes the frequency band.
- a reception signal having BW is output to the envelope detection circuit 26 via the switch 23 and the terminal 24.
- the envelope detection circuit 26 performs envelope detection on the received signal of the radio frame (step S33), and outputs the detected envelope to the signal detection circuit 27.
- the signal detection circuit 27 samples the envelope with a sampling period, converts the envelope into a digital signal sequence (step S34), and outputs the converted digital signal sequence to the matching circuit 28.
- the matching circuit 28 matches the interval of “1” in the digital signal sequence with one or more signal detection intervals representing the ID of the receiver 2 (step S35).
- control circuit 29 determines whether or not a signal consisting of “1” has been received from the matching circuit 28 (step S36).
- step S 36 when the control circuit 29 determines that the signal consisting of “1” has been received from the matching circuit 28, the control circuit 29 controls the wireless interface 30 and the host system 31 so as to shift from the sleep state to the activated state. Then, the host system 31 shifts from the sleep state to the activated state (step S37).
- control circuit 29 determines in step S36 that the signal consisting of “1” has not been received from the matching circuit 28, the control circuit 29 controls the wireless interface 30 and the host system 31 so as to maintain the sleep state.
- the host system 31 maintains the sleep state (step S38).
- step S37 or step S38 a series of operations ends.
- step S1 as a result of the transmitter 1 transmitting a plurality of radio frames according to the flowchart shown in FIG. 8 or FIG. 10, the receiver 2 receives a plurality of signals in which the received signal received from the transmitter 1 represents the ID of the receiver 2. It is detected that the pattern matches the detection interval pattern [S 1 S 2 S 3 ] (see step S35).
- the receiver 2 detects that the received signal is “1” at each of the detection timings DT1 to DT4, and the time interval between two adjacent detection timings (DT1, DT2, etc.) is a plurality of signals. It becomes equal to the signal detection interval of one of the detection intervals S 1 S 2 S 3 .
- the transmitter 1 transmits one radio frame when the radio communication space is free (“YES” in steps S11 and S12 in FIG. 8, S13 and S14, and step S25 in FIG. 10). reference). Further, the transmitter 1 waits for transmission of a radio frame until it is determined that the radio communication space is free as a result of carrier sense (see “NO” in steps S11 and S12 in FIG. 8). Further, as described above, even when the transmitter 1 transmits a radio frame according to the flowchart shown in FIG. 10, the transmitter 1 transmits a radio frame when the radio communication space is empty, and transmits a radio frame when the radio communication space is not empty. Wait for transmission.
- the transmitter 1 shifts from the sleep state to the activated state when the radio communication space is free.
- a single radio frame is transmitted in a desired frequency band so as to constitute a plurality of signal detection intervals, and when the wireless communication space is not vacated as a result of carrier sense, a transmission process for waiting for transmission of one radio frame is performed as a carrier. This is equivalent to executing each time a sense is performed.
- a plurality of signal detection intervals can be configured by one radio frame.
- the receiver 2 receives one radio frame by transmitting one radio frame having a frame length corresponding to the time length from the detection timing DT1 to the detection timing DT3 shown in FIG. Based on the signal, “1” is detected at detection timings DT1, DT2, and DT3, and a plurality of signal detection intervals S 1 and S 2 are detected.
- FIG. 16 is a schematic diagram showing another configuration of the receiver 2 shown in FIG.
- the radio communication system 10 according to the first embodiment of the present invention may include a receiver 2A shown in FIG.
- receiver 2A is obtained by adding intensity detection circuit 32 to receiver 2 shown in FIG. 3, and the rest is the same as receiver 2.
- the intensity detection circuit 32 is disposed between the envelope detection circuit 26 and the signal detection circuit 27.
- the intensity detection circuit 32 receives the detection result from the envelope detection circuit 26 and detects the received signal intensity that is the intensity of the received detection result. Then, the intensity detection circuit 32 compares the detected received signal intensity with the threshold value TI, and outputs a detection signal having the detected received signal intensity to the signal detection circuit 27 when the received signal intensity is larger than the threshold value TI. . On the other hand, when the detected received signal strength is equal to or less than the threshold value TI, the strength detecting circuit 32 discards the detected signal having the detected received signal strength.
- the intensity detection circuit 32 outputs only the detection signal having a received signal intensity greater than the threshold value TI among the detection results received from the envelope detection circuit 26 to the signal detection circuit 27.
- the signal detection circuit 27 samples the detection signal from the intensity detection circuit 32 at a sampling period and converts the detection signal into a digital signal sequence.
- the wireless interface 30 and the host system 31 stop operating, and the broadband RF filter 22, envelope detection circuit 26, intensity detection circuit 32, signal detection circuit 27, matching circuit 28, and control circuit 29 is called “sleep state”, and the broadband RF filter 22, envelope detection circuit 26, intensity detection circuit 32, signal detection circuit 27, matching circuit 28, control circuit 29, wireless interface 30, and host system A state in which 31 is operating is referred to as an “active state”.
- FIG. 17 is a diagram illustrating a method for determining the threshold value TI.
- the radio frames FR7 to FR12 are excluded, and the radio frames FR6 and FR13 are used for matching the received signal and the ID of the receiver 2A.
- the received signal strength of the wireless frame transmitted from the wireless device EX is weaker than the received signal strength of the wireless frame transmitted from the transmitter 1.
- the receiver 2A can determine whether or not the received signal matches its own ID by excluding the interference frames (radio frames FR7 to FR12) transmitted from the radio apparatus EX. .
- FIG. 18 is a flowchart showing an operation of shifting the receiver 2A shown in FIG. 16 from the sleep state to the activated state in the wireless communication system 10.
- step S32A is added between step S33 and step S34 of the flowchart shown in FIG.
- the intensity detection circuit 32 of the receiver 2A detects the received signal intensity of the detection result received from the envelope detection circuit 26.
- the intensity detection circuit 32 compares the received signal intensity with the threshold value TI, detects a detection signal having a received signal intensity greater than the threshold value TI, and outputs the detected signal to the signal detection circuit 27.
- the receiver 2A detects a detection signal having a received signal strength larger than the threshold value TI, and determines whether or not the detected detection signal matches the ID of the receiver 2A. It is possible to determine whether or not the received signal of the radio frame matches the ID of the receiver 2A by excluding the interference frame transmitted from the other radio apparatus EX.
- FIG. 19 is a schematic diagram showing still another configuration of the receiver 2 shown in FIG.
- the radio communication system 10 according to the first embodiment of the present invention may include a receiver 2B shown in FIG.
- the receiver 2B is the same as the receiver 2 except that the envelope detection circuit 26 of the receiver 2 shown in FIG. 3 is replaced with a synchronous detection circuit 26A.
- the synchronous detection circuit 26A receives a radio signal reception signal from the broadband RF filter 22 via the terminal 24, and performs synchronous detection on the received reception signal. Then, the synchronous detection circuit 26A outputs the result of the synchronous detection to the signal detection circuit 27.
- FIG. 20 is a schematic diagram showing the configuration of the synchronous detection circuit 26A shown in FIG. Referring to FIG. 20, the synchronous detection circuit 26 ⁇ / b> A includes a multiplier 261, a carrier wave recovery circuit 262, and a low pass filter (LPF: Low Pass Filter) 263.
- LPF Low Pass Filter
- Multiplier 261 receives a radio signal reception signal from broadband RF filter 22 via terminal 24 and receives a carrier wave from carrier wave recovery circuit 262. Multiplier 261 multiplies the received signal of the radio signal by the carrier wave, and outputs the multiplication result to LPF 263.
- the carrier wave recovery circuit 262 receives a radio signal reception signal from the broadband RF filter 22 via the terminal 24, and regenerates the carrier wave based on the received radio signal reception signal. This carrier has the same frequency and phase as the carrier when the radio signal is transmitted. Then, the carrier recovery circuit 262 outputs the recovered carrier to the multiplier 261.
- LPF 263 receives the multiplication result from multiplier 261, removes the high frequency component of the received multiplication result, and outputs the low frequency component of the multiplication result to signal detection circuit 27 as the detection result.
- the signal detection circuit 27 samples the detection result from the synchronous detection circuit 26A at a sampling period and converts it into a digital signal sequence.
- the receiver 2B synchronously detects the received signal of the radio signal and converts the received signal into a digital signal sequence.
- the wireless communication system 10 may include a receiver in which the envelope detection circuit 26 of the receiver 2A illustrated in FIG. 16 is replaced with a synchronous detection circuit 26A.
- the wireless communication system 10 may include a receiver in which the envelope detection circuit 26 of the receiver 2 shown in FIG. 3 and the receiver 2A shown in FIG. 16 is replaced with a regenerative detection circuit.
- the regenerative detection circuit receives a radio signal reception signal from the broadband RF filter 22 via the terminal 24, and detects the received radio signal reception signal by regenerative detection (Non-patent Document 1). Then, the reproduction detection circuit outputs the detection result to the signal detection circuit 27. Further, the reproduction detection circuit receives a reception signal having an intensity equal to or greater than a threshold value from the intensity detection circuit 32, reproduces and detects the received signal received, and outputs the detection result to the signal detection circuit 27.
- the wireless communication system 10 may include a receiver that detects a reception signal of a wireless signal by envelope detection, synchronous detection, regenerative detection, and the like. You may provide the receiver which detects the received signal of a radio signal by the method.
- FIG. 21 is a flowchart showing another operation for shifting the receiver 2 from the sleep state to the activated state in the wireless communication system 10.
- the flowchart shown in FIG. 21 is the same as the flowchart shown in FIG. 15 except that steps S33 and S34 in the flowchart shown in FIG. 15 are replaced with steps S33A and 34A, respectively.
- the receiver 2 detects the reception signal of the radio frame (step S33A), samples the detection result at a sampling period, and converts the detection result into a digital signal sequence (step S34A).
- the operation of shifting the receiver 2A shown in FIG. 16 from the sleep state to the activated state is performed by replacing steps S33 and S34 in the flowchart shown in FIG. 18 with steps S33A and S34A shown in FIG. May be performed according to
- the transmitter 1 includes a plurality of radios such that the signal detection intervals in the receivers 2, 2A, 2B are the IDs of the receivers 2, 2A, 2B.
- the receivers 2, 2A, 2B detect a signal detection interval that matches their own ID based on the received signal of the wireless signal received from the transmitter 1 or a wireless device other than the transmitter 1, Transition from sleep state to start-up state.
- the signal detection circuit 27 detects a signal of “1” at each of the detection timings DT1 to DT4.
- the signal detection circuit 27 is not limited to this, and A signal having a value larger than the threshold value Vth may be detected at timings DT1 to DT4. That is, the signal detection circuit 27 may detect a signal having a value larger than the threshold value Vth if there is a reception signal at each of the detection timings DT1 to DT4.
- a value larger than the threshold value Vth is a positive integer.
- a value larger than the threshold Vth is input to the matching circuit 28. Even if the value larger than the threshold Vth is a value other than “1”, the value larger than the threshold Vth is H level in the matching circuit 28. It is processed as a signal.
- the transmission reference time is set to the transmission end time of the first radio frame FR1, but in Embodiment 1, the transmission reference time is not limited to this, and the transmission reference time is set to an arbitrary time. It may be set.
- FIG. 22 is a schematic diagram showing a configuration of a wireless communication system according to the second embodiment.
- the wireless communication system 100 according to the second embodiment includes a transmitter 101, a receiver 102, and a device 103.
- the transmitter 101 has the same configuration as the transmitter 1 in the first embodiment.
- a radio frame is transmitted to the receiver 102 in a desired frequency band including a plurality of frequency channels.
- the desired frequency band is as described in the first embodiment.
- the receiver 102 holds the ID of the device 103, and the receiver 102 receives a radio frame from the transmitter 101 in a desired frequency band including a plurality of frequency channels, and the received radio frame is the device.
- the ID matches 103 the device 103 is controlled.
- the device 103 includes any one of electric devices such as a lighting, a speaker, a monitor, a camera, and a motor.
- the device 103 is controlled by the receiver 102.
- the device 103 is controlled to be turned on / off or controlled in brightness.
- the device 103 includes a speaker, the volume is controlled.
- FIG. 23 is a schematic diagram showing the configuration of the receiver 102 shown in FIG. Referring to FIG. 23, receiver 102 deletes switch 23, terminals 24 and 25, wireless interface 30 and host system 31 of receiver 2 shown in FIG. 3, and replaces envelope detection circuit 26 with detection circuit 1021. The rest is the same as the receiver 2.
- the detection circuit 1021 is disposed between the broadband RF filter 22 and the signal detection circuit 27. Then, the detection circuit 1021 detects the received signal by any of the above-described envelope detection, synchronous detection, and reproduction detection, and outputs the detection result to the signal detection circuit 27.
- matching circuit 28 includes flip-flops connected in series corresponding to signal detection intervals [S 1 S 2 S 3 ... S k ⁇ 1 ] representing the ID of device 103.
- the control circuit 29 performs desired control on the device 103 when receiving a signal consisting of “1” from the matching circuit 28.
- FIG. 24 is a flowchart showing an operation in the radio communication system 100 shown in FIG.
- the flowchart shown in FIG. 24 is obtained by replacing steps S35 and S37 in the flowchart shown in FIG. 21 with steps S35A and S37A, deleting step S38, and adding step S39.
- the other steps are the same as the flowchart shown in FIG. The same.
- transmitter 101 executes step S31 described above, and receiver 102 sequentially executes steps S32, S33A, and S34A described above.
- step S31 the transmitter 101 transmits the plurality of radio frames to the CSMA / CA radio communication so that one or more signal detection intervals representing the ID of the device 103 are detected by the receiver 102 as the reception destination.
- step S33A the receiver 102 detects the reception signal of the radio signal by any one of envelope detection, synchronous detection, and reproduction detection.
- step S34A the matching circuit 28 of the receiver 102 matches the interval of “1” in the digital signal sequence with one or more signal detection intervals representing the ID of the device 103 (step S35A).
- step S36 When it is determined in step S36 that a signal consisting of “1” has not been received, the series of operations ends.
- step S36 when it is determined in step S36 that a signal consisting of “1” has been received, the control circuit 29 of the receiver 102 controls the device 103 (step S37A).
- the control circuit 29 controls the illumination so as to be turned on, controls the illumination so as to be turned off, and controls the illumination so as to reduce the brightness.
- the device 103 executes the control content according to the control from the control circuit 29 (step S39). More specifically, when the device 103 is composed of lighting, the device 103 is turned on or turned off or the brightness is increased according to control from the control circuit 29. As a result, a series of operations is completed.
- the transmitter 101 transmits a radio frame to the receiver 102 such that one or more signal detection intervals representing the ID of the device 103 are detected by the receiver 102 when the radio communication space is free.
- the wireless communication space is not available, it waits for transmission of the wireless frame.
- a wireless device other than the transmitter 101 transmits a wireless frame.
- the receiver 102 receives a radio frame from the transmitter 101 when the radio communication space is empty, and receives a radio frame from a radio device other than the transmitter 101 when the radio communication space is not empty.
- the receiver 102 detects a signal having a value larger than the threshold value Vth at a detection timing for detecting each of one or a plurality of signal detection intervals representing the identifier of the device 103, and the received signal becomes the identifier of the device 103. It is determined that they match, and the device 103 is controlled.
- the control content in the device 103 includes various contents according to the specific example of the device 103. In one specific example of the device 103, various control contents such as “ON”, “OFF”, and “brighten” are provided.
- the control circuit 29 of the receiver 102 selects desired control contents from various control contents, and controls the device 103 to execute the selected control contents.
- the wireless communication system 100 may include a receiver having a configuration in which the strength detection circuit 32 is added to the receiver 102 instead of the receiver 102.
- FIG. 25 is a schematic diagram showing a configuration of a wireless communication system according to the third embodiment.
- wireless communication system 300 according to Embodiment 3 includes transmitters 301 to 30i (i is an integer of 1 or more) and receivers 311 to 31j (j is an integer of 1 or more). .
- the wireless communication system 300 is arranged in a hospital, for example.
- the receivers 311 to 31j are connected to the server 330 via the cable 320.
- the receivers 311 to 31j are arranged at desired positions at predetermined positions.
- Each of the transmitters 301 to 30i detects a signal detection interval pattern [S 1 S 2 S 3 ... S k-1 ] representing its own ID at the receiver (any one of the receivers 311 to 31j). As described above, a plurality of radio frames are broadcast at regular intervals. The fixed period is, for example, 10 minutes. Each of the transmitters 301 to 30i is carried by a staff member in a hospital, for example.
- Each of the receivers 311 to 31j holds in advance all IDs of the transmitters 301 to 30i.
- Each of the receivers 311 to 31j receives a plurality of radio frames from any of the transmitters 301 to 30i, and the received signals of the received plurality of radio frames are transmitted to the transmitter ID (transmitters 301 to 30i). When it is detected that it matches any one of the IDs), it transmits its own ID and the transmitter ID (any one of the transmitters 301 to 30i) to the server 330 via the cable 320.
- the server 330 stores the IDs of the receivers 311 to 31j and the arrangement positions of the receivers 311 to 31j in association with each other. In addition, the server 330 stores the IDs of the transmitters 301 to 30i and the names of staff members in association with each other. Then, the server 330 sends the receiver ID (any one of the receivers 311 to 31j) and the transmitter ID (any one of the transmitters 301 to 30i) from the receiver (any one of the receivers 311 to 31j). ), The position information associated with the received receiver ID is detected, the staff name associated with the transmitter ID is detected, and the detected staff name and The position information is displayed in association with each other. The server 330 performs this operation every time it receives the ID of the receiver and the ID of the transmitter.
- FIG. 26 is a schematic diagram showing the configuration of the transmitter 301 shown in FIG. Referring to FIG. 26, a transmitter 301 is the same as transmitter 1 except that host system 11 of transmitter 1 shown in FIG.
- the host system 11A holds the ID of the device 103 in advance.
- the host system 11A has one radio frame constituting one signal detection interval among one or more signal detection intervals representing the ID of the device 103.
- the wireless interface 12 is controlled so as to transmit, and when the wireless communication space is not available, the wireless interface 12 is controlled so as to wait for transmission of one wireless frame.
- the host system 11A is the same as the host system 11 except that the transmission timing control unit 112 of the host system 11 shown in FIG.
- the transmission timing control unit 112A receives the carrier sense result from the carrier sense result acquisition unit 111, performs transmission control based on the received carrier sense result, and performs wireless control in the wireless interface 12 based on the ID of the transmitter 301.
- the transmission timing of the frame is controlled and it is determined that the wireless communication space is vacant based on the result of carrier sense in the time zone in which the wireless frame is desired to be transmitted, the wireless frame is transmitted. Further, the transmission timing control unit 112A does not transmit the radio frame in the radio interface 12 when it is determined that the radio communication space is not free based on the result of the carrier sense in the time zone in which the radio frame is desired to be transmitted.
- each of the transmitters 302 to 30i shown in FIG. 25 has the same configuration as the transmitter 301 shown in FIG.
- FIG. 27 is a schematic diagram showing the configuration of the receiver 311 shown in FIG. Referring to FIG. 27, receiver 311 deletes switch 23, terminals 24 and 25, wireless interface 30 and host system 31 of receiver 2 shown in FIG. 3, and replaces envelope detection circuit 26 with detection circuit 3111.
- the matching circuit 28 is replaced with the interval detection circuit 3112, the control circuit 29 is replaced with the control circuit 3113, and the storage means 3114 is added. The rest is the same as the receiver 2.
- the detection circuit 3111 is disposed between the broadband RF filter 22 and the signal detection circuit 27. Then, the detection circuit 3111 detects the received signal by any of the above-described envelope detection, synchronous detection, and reproduction detection, and outputs the detection result to the signal detection circuit 27.
- the interval detection circuit 3112 receives the digital signal sequence from the signal detection circuit 27, counts the number of “0” s present between “1” and “1” in the received digital signal sequence, and counts the “ One or more signal detection intervals are detected based on the number of 0 ′′. Then, the interval detection circuit 3112 outputs the detected one or more signal detection intervals to the control circuit 3113.
- the control circuit 3113 holds the ID of the receiver 311. In addition, the control circuit 3113 receives one or more signal detection intervals from the interval detection circuit 3112. Then, the control circuit 3113 searches the storage unit 3114 for the ID of the transmitter that matches the received signal detection interval or intervals. When the control circuit 3113 detects the transmitter ID that matches one or more signal detection intervals as a result of the search, the control circuit 3113 sends the detected transmitter ID and the receiver 311 ID to the server via the cable 320. 330.
- control circuit 3113 when the control circuit 3113 does not detect the ID of the transmitter that matches the one or more signal detection intervals, the control circuit 3113 discards the one or more signal detection intervals.
- the storage unit 3114 stores all IDs of the transmitters 301 to 30i.
- each of the receivers 312 to 31j shown in FIG. 25 has the same configuration as the receiver 311 shown in FIG.
- FIG. 28 is a schematic diagram showing the configuration of the server 330 shown in FIG. Referring to FIG. 28, server 330 includes control means 3301, storage means 3302, and display means 3303.
- the control means 3301 receives the ID of the transmitter (any ID of the transmitters 301 to 30i) and the ID of the receiver (any ID of the receivers 311 to 31j) via the cable 320.
- control means 3301 searches the storage means 3302 and detects position information associated with the received receiver ID from the storage means 3302. Further, when detecting the position information, the control unit 3301 searches the storage unit 3302 and detects the name of the staff member associated with the ID of the transmitter. Then, the control unit 3301 acquires the current time from the built-in timer, associates the current time, position information, and staff name with each other, and displays the associated current time, position information, and staff name on the display unit 3303. Output.
- the storage unit 3302 stores the ID of the receiver and the position information of the position where the receiver is disposed in association with each other.
- the storage unit 3302 stores the ID of the transmitter and the name of the staff in association with each other.
- the display unit 3303 receives the current time, position information, and staff name associated with each other from the control unit 3301, and displays the received current time, position information, and staff name in association with each other.
- FIG. 29 is a flowchart showing an operation in the wireless communication system 300 shown in FIG.
- the operation of the wireless communication system 300 will be described by taking as an example a case where the receiver 312 detects one or more signal detection intervals indicating the ID of the transmitter 301 shown in FIG.
- steps S35A, S36, and S37A in the flowchart shown in FIG. 24 are replaced with steps S35B, S36A, and S37B, respectively, and step S39 is replaced with steps S40 to S43. It is the same as the flowchart shown.
- transmitter 301 executes step S31 described above.
- the transmitter 301 broadcasts a plurality of radio frames so that the receiver 312 detects one or more signal detection intervals representing its own ID.
- the receiver 312 sequentially executes the above-described steps S32, S33A, and S34A.
- the interval detection circuit 3111 of the receiver 312 counts the number of “0” s between “1” and “1” in the digital signal sequence received from the signal detection circuit 27, and the counted “ Based on the number of 0 ′′, one or more signal detection intervals are detected (step S35B). Then, the interval detection circuit 3112 of the receiver 312 outputs the detected one or more signal detection intervals to the control circuit 3113.
- control circuit 3113 When the control circuit 3113 receives one or more signal detection intervals from the interval detection circuit 3112, the control circuit 3113 searches the storage means 3114 and detects the ID of the transmitter 301 that matches the received one or more signal detection intervals. (Step S36A).
- control means 3112 of the receiver 312 transmits its own ID (ID of the receiver 312) and the ID of the transmitter 301 to the server 330 via the cable 320 (step S37B).
- the control means 3301 of the server 330 receives the ID of the receiver 312 and the ID of the transmitter 301 (step S40). Then, the control unit 3301 of the server 330 searches the storage unit 3302 and detects position information associated with the received receiver ID (step S41).
- control means 3301 of the server 330 searches the storage means 3302 and detects the name of the staff member associated with the ID of the transmitter 301 (step S42).
- control unit 3301 of the server 330 acquires the current time from the built-in timer, outputs the current time, the name of the staff, and the position information in association with each other to the display unit 3303.
- the display unit 3303 displays the current time, The staff name and position information are displayed in association with each other (step S43). This completes a series of operations.
- the operation of the wireless communication system 300 is as follows: It is executed according to the flowchart shown in FIG.
- steps S31, S32, S33A, S34A, S35B, S36A, S37B, and S40 to S43 shown in FIG. 29 are repeatedly executed at a constant cycle.
- each of the transmitters 301 to 30i has a plurality of radios so that one or a plurality of signal detection intervals representing its own ID are detected by the receiver (any one of the receivers 311 to 31j) at regular intervals.
- the frame is broadcast (step S31).
- the server 330 displays the position information of each staff member at the current time at regular intervals. Therefore, it is possible to grasp where each staff member in the hospital is at each time.
- the receiver transmits its own ID (receiver ID) and the transmitter ID to the server 330, whereby the operation in the server 330 (steps S40 to S43) is executed. .
- the server 330 performs an operation of displaying the name of the staff corresponding to the ID of the transmitter in association with the position information of the staff.
- the receiver transmits its own ID (receiver ID) and the transmitter ID to the server 330
- the operation of the server 330 is executed, and the receiver receives its own ID (receiver ID). If the ID of the transmitter is not transmitted to the server 330, the operation of the server 330 is not executed. This is equivalent to turning the illumination on or off, for example.
- the fact that the receiver transmits its own ID (receiver ID) and the transmitter ID to the server 330 corresponds to the receiver controlling the operation of the server 330.
- the signal detection interval representing its own ID is detected by any of the receivers 311 to 31j.
- the wireless frame is broadcast so that when the wireless communication space is not available, the transmission of the wireless frame is awaited.
- wireless devices other than the transmitters 301 to 30i transmit wireless frames.
- each of the receivers 311 to 31j receives a radio frame from each of the transmitters 301 to 30i when the radio communication space is vacant, and when the radio communication space is not vacant, A wireless frame is received from the wireless device.
- each of the receivers 311 to 31j has its own ID when one or more signal detection intervals detected based on the received radio frame match the ID of the transmitter (any one of the transmitters 301 to 30i). (Receiver ID) and transmitter ID are transmitted to the server 330, and the operation of the server 330 is controlled.
- radio communication system 300 may include j receivers each having a configuration in which intensity detection circuit 32 is added to each of receivers 311 to 31j, instead of receivers 311 to 31j. Good.
- the operation in wireless communication system 300 is executed according to a flowchart in which step S32A (see FIG. 18) described above is added between step S32 and step S33A of the flowchart shown in FIG.
- the wireless communication system 300 may be arranged not only in a hospital but also in a building, and generally only in a facility where a plurality of people act. .
- the wireless communication system 300 includes the transmitter 301 to 30i (i is an integer of 1 or more) and receivers 311 to 31j (j is an integer of 1 or more).
- the transmitter 1 has a plurality of signal detection intervals such that one or more signal detection intervals representing the ID of the receiver 2 to be shifted from the sleep state to the activated state are detected by the receiver 2. It has been described that the wireless frame is transmitted and the receiver 2 shifts from the sleep state to the activated state when the received signal of the wireless frame received from the transmitter 1 matches its own ID. That is, it has been described that the receiver 2 controls its own operation.
- the transmitter 101 transmits a plurality of radio frames so that one or more signal detection intervals representing the ID of the device 103 are detected by the receiver 102.
- the receiver 102 In the above description, various controls are performed on the device 103 when the received signal of the radio frame received from the transmitter 101 matches the ID of the device 103. That is, it has been described that the receiver 2 controls the operation of the devices 103 other than itself.
- each of the transmitters 301 to 30i has one or more signal detection intervals representing its own ID (transmitter ID) at the receiver (any one of the receivers 311 to 31j).
- a plurality of radio frames are transmitted so as to be detected, and each of the receivers 311 to 31j receives a radio frame received signal from a transmitter (any one of the transmitters 301 to 30i) as a transmitter (transmitters 301 to 30i).
- the staff 330 corresponding to the ID of the transmitter any one of the transmitters 301 to 30i
- the position information are displayed in association with each other.
- the control was explained as follows. That is, it has been described that each of the receivers 311 to 31j controls the operation of the server 330 other than itself.
- the time interval between the detection timings of the radio frames in the receiving radio apparatus represents one or more identifiers.
- One radio frame is transmitted in a desired frequency band so as to constitute one signal detection interval among the signal detection intervals, and one radio frame is transmitted when the wireless communication space is not free as a result of carrier sense. May be executed every time carrier sense is performed.
- the transmission method performs a carrier sense, transmits a radio signal when the radio communication space is vacant, and waits for transmission of the radio signal when the radio communication space is not vacant.
- carrier sensing is performed for transmission processing that waits for transmission of one radio frame. It is sufficient that a second step of executing in each.
- the receiver detects the received signal of the radio frame transmitted from the transmitter and detects one or more signals detected based on the digital signal sequence obtained from the detection result. What is necessary is just to perform desired control when the detection interval matches the identifier.
- the present invention is applied to a transmitter, a transmission method therefor, a receiver that receives a radio signal from the transmitter, and a radio communication system including them.
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Abstract
Description
図1は、この発明の実施の形態1による無線通信システムの概略図である。図1を参照して、この発明の実施の形態1による無線通信システム10は、送信機1と、受信機2とを備える。
図22は、実施の形態2による無線通信システムの構成を示す概略図である。図22を参照して、実施の形態2による無線通信システム100は、送信機101と、受信機102と、機器103とを備える。
図25は、実施の形態3による無線通信システムの構成を示す概略図である。図25を参照して、実施の形態3による無線通信システム300は、送信機301~30i(iは1以上の整数)と、受信機311~31j(jは、1以上の整数)とを備える。
Claims (14)
- キャリアセンスを行い、無線通信空間が空いているとき無線信号を送信し、前記無線通信空間が空いていないとき前記無線信号の送信を待機する無線通信方式に従って無線フレームを送信する送信機であって、
複数の周波数チャネルを含む所望の周波数帯でキャリアセンスするキャリアセンス手段と、
前記キャリアセンス手段によるキャリアセンスの結果、無線通信空間が空いているとき、受信先の無線装置における無線フレームの検出タイミング間の時間間隔が識別子を表す1つまたは複数の信号検出間隔のうちの1つまたは複数の信号検出間隔を構成するように1つの無線フレームを前記所望の周波数帯で送信し、前記キャリアセンスの結果、前記無線通信空間が空いていないとき、前記1つの無線フレームの送信を待機する送信処理を前記キャリアセンスを行う毎に実行する送信手段とを備える送信機。 - 前記送信手段は、前記無線通信空間が空いているとき、前記無線装置における前記識別子の検出タイミングを跨ぐように前記1つの無線フレームを送信する、請求項1に記載の送信機。
- 前記送信手段は、任意の基準時刻に基づいて前記1つの無線フレームの送信タイミングを決定し、その決定した送信タイミングで前記1つの無線フレームを送信する、請求項2に記載の送信機。
- 前記送信手段は、前記無線通信空間が空いているとき、前記無線通信方式における最大の遅延時間に前記無線装置におけるサンプリング周期を加算した値からなるフレーム長を有する前記1つの無線フレームを前記識別子の検出タイミングを跨ぐように送信する、請求項2に記載の送信機。
- 前記送信手段は、最初の無線フレームの送信開始時刻から少なくとも1つの信号検出間隔に相当する時間が経過すると、前記1つの無線フレームを送信する、請求項4に記載の送信機。
- キャリアセンスを行い、無線通信空間が空いているとき無線信号を送信し、前記無線通信空間が空いていないとき前記無線信号の送信を待機する無線通信方式に従って無線フレームを送信する送信方法であって、
複数の周波数チャネルを含む所望の周波数帯でキャリアセンスする第1のステップと、
前記キャリアセンスの結果、無線通信空間が空いているとき、受信先の無線装置における無線フレームの検出タイミング間の時間間隔が識別子を表す1つまたは複数の信号検出間隔のうちの1つまたは複数の信号検出間隔を構成するように1つの無線フレームを前記所望の周波数帯で送信し、前記キャリアセンスの結果、前記無線通信空間が空いていないとき、前記1つの無線フレームの送信を待機する送信処理を前記キャリアセンスを行う毎に実行する第2のステップとを備える送信方法。 - 前記第2のステップにおいて、前記1つの無線フレームは、前記無線装置における前記識別子の検出タイミングを跨ぐように送信される、請求項6に記載の送信方法。
- 前記第2のステップにおいて、前記1つの無線フレームは、任意の基準時刻に基づいて決定された送信タイミングで送信される、請求項7に記載の送信方法。
- 前記第2のステップにおいて、前記無線通信空間が空いているとき、前記無線通信方式における最大の遅延時間に前記無線装置におけるサンプリング周期を加算した値からなるフレーム長を有する前記1つの無線フレームが前記識別子の検出タイミングを跨ぐように送信される、請求項7に記載の送信方法。
- 前記第2のステップにおいて、前記無線通信空間が空いているとき、前記1つの無線フレームは、最初の無線フレームの送信開始時刻から少なくとも1つの信号検出間隔に相当する時間が経過すると送信される、請求項9に記載の送信方法。
- 無線フレームの受信信号を複数の周波数チャネルを含む所望の帯域幅で通過させるフィルタと、
前記フィルタを通過した受信信号を検波する検波手段と、
前記検波手段による検波結果をサンプリング周期でサンプリングして前記検波結果をディジタル信号列に変換する変換手段と、
前記ディジタル信号列に基づいて検出された1つまたは複数の信号検出間隔が識別子に一致するとき、所望の制御を行う制御手段とを備える受信機。 - 前記制御手段は、
前記ディジタル信号列に基づいて識別子を表す1つまたは複数の信号検出間隔を検出するための複数の検出タイミングの全てにおいて第1の閾値よりも大きい値からなる信号が検出されていると判定したとき、前記識別子を受信したことを示す信号を出力するマッチング回路と、
前記マッチング回路から前記識別子を受信したことを示す信号を受けると、所望の制御を行う制御回路とを含む、請求項11に記載の受信機。 - 前記検波手段による検波結果に基づいて第2の閾値よりも大きい受信信号強度を有する検波信号を検出し、その検出した検波信号を前記変換手段へ出力する検出手段を更に備え、
前記変換手段は、前記検出手段からの検波信号をサンプリング周期でサンプリングして前記検波信号をディジタル信号列に変換する、請求項11または請求項12に記載の受信機。 - 請求項1に記載の送信機と、
請求項11に記載の受信機とを備える無線通信システム。
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