JP5884994B2 - Radio apparatus, radio communication system including the same, program for causing computer to execute transmission of radio frame in radio apparatus, and program for causing computer to receive radio frame transmitted from radio apparatus - Google Patents

Description

  The present invention relates to a wireless device, a wireless communication system including the same, a computer for transmitting a wireless frame in the wireless device, and a program for causing a computer to receive a wireless frame transmitted from the wireless device.

    Conventionally, when a wireless LAN channel having the same frequency is observed using an 802.15.4 sensor motes that consumes lower power than a wireless LAN (Local Area Network) card and radio waves from the transmission source are detected, A method for waking up a LAN card has been proposed (Non-Patent Document 1).

  In addition, methods for waking up a wireless LAN card using a wakeup receiver that consumes lower power have been proposed (Patent Documents 1 to 3 and Non-Patent Document 2).

Special table 2007-526655 gazette International Publication No. 04/100503 Pamphlet US Patent Application Publication No. 2007/0253468

Nilesh Mishra, Kameswari Chebrolu, Bhaskaran Raman, Abhinav Pathak, Wakeon WLAN, WWW 2006. Shigeki Ishida, Makoto Suzuki, Takashi Morito, Hiroyuki Morikawa, Multistage Wakeup Mechanism for Low Receiving Standby Power Wireless Communication, IEICE technical report, information networks 107 (525), 355-360, 2008-02-28. E. H. Armstrong, “Some recent developments of regenerative circuits,” Proc. Inst. Radio Eng., Vol. 10, pp. 244-260, Aug. 1922.

  However, in Patent Documents 1 to 3 and Non-Patent Documents 1 and 2, since wireless communication is performed via an access point, a wireless device that does not belong to the access point can wake up other wireless devices. There is a problem that an up signal cannot be transmitted.

  Further, when a wireless frame having a frame length representing a wakeup signal is transmitted by wireless communication, there is a problem that the frame length of the wireless frame changes and it is difficult to accurately receive the wakeup signal.

  Accordingly, the present invention has been made to solve such a problem, and an object of the present invention is to provide a radio apparatus capable of transmitting a radio frame for controlling a control target device even when the radio frame cannot be transmitted. That is.

Another object of the present invention is to provide a wireless communication system including a wireless device capable of transmitting a wireless frame for controlling a control target device even when the wireless frame cannot be transmitted.

  Furthermore, another object of the present invention is to provide a program for causing a computer to execute transmission of a wireless frame in a wireless device capable of transmitting a wireless frame for controlling a device to be controlled even when the wireless frame cannot be transmitted. That is.

  Furthermore, another object of the present invention is a program for causing a computer to receive a wireless frame transmitted by a wireless device capable of transmitting a wireless frame for controlling a control target device even when the wireless frame cannot be transmitted. Is to provide.

  Furthermore, another object of the present invention is to provide a radio apparatus capable of transmitting a radio frame representing transmission information so that it can be accurately received even if the frame length changes.

  Furthermore, another object of the present invention is to provide a radio apparatus capable of accurately receiving a radio frame representing transmission information even if the frame length changes.

  Furthermore, another object of the present invention is to provide a wireless communication system including a wireless device capable of transmitting a wireless frame representing transmission information so that it can be accurately received even if the frame length changes.

  Furthermore, another object of the present invention is to provide a program for causing a computer to execute transmission of a radio frame in a radio apparatus capable of transmitting a radio frame representing transmission information so that it can be accurately received even if the frame length changes. Is to provide.

  Furthermore, another object of the present invention is to cause a computer to receive a radio frame transmitted by a radio device capable of transmitting a radio frame representing transmission information so that it can be accurately received even if the frame length changes. Is to provide a program.

  According to the embodiment of the present invention, the wireless device includes a determination unit and a transmission unit. The determining unit determines a plurality of frame lengths so as to represent transmission information to be transmitted to a transmission destination based on a calculation result obtained by applying a desired calculation method to a plurality of frame lengths of a plurality of radio frames. The transmitting unit transmits a plurality of radio frames having a plurality of frame lengths determined by the determining unit.

  According to the embodiment of the present invention, the wireless device includes a receiving unit, a detecting unit, a calculating unit, and a decoding unit. The receiving means receives a plurality of radio frames from the radio apparatus according to any one of claims 1 to 4. The detecting means detects a plurality of frame lengths of the plurality of radio frames. The calculation means calculates a plurality of frame lengths detected by the detection means by applying a desired calculation method. The decoding means decodes the transmission information based on the calculation result calculated by the calculation means.

  Furthermore, according to the embodiment of the present invention, the wireless communication system includes a transmitter and a receiver. The transmitter includes the wireless device according to any one of claims 1 to 4. The receiver includes the wireless device according to any one of claims 5 to 7.

Further, according to the embodiment of the present invention, the wireless device is a wireless device that performs wireless communication belonging to the access point in the infrastructure mode in normal operation, and includes a control unit and a transmission unit. The control means autonomously transmits a radio frame when starting transmission of transmission information to be transmitted when the wireless link is not established between the wireless device and the access point or another wireless device in the infrastructure mode. A mode transition signal instructing transition to a possible autonomous transmission mode is output. Upon receiving the mode transition signal from the control means, the transmission means shifts from the infrastructure mode to the autonomous transmission mode, and transmits the radio frame so that the transmission information is represented using the frame length of the radio frame.

  Further, according to the embodiment of the present invention, the wireless communication system includes a wireless device and a receiver. The wireless device comprises the wireless device according to claim 22. The receiver receives a radio frame from the radio device, detects a radio wave received from the received radio frame, detects a frame length of the radio frame, generates a bit string based on the detected frame length, and generates the bit string When the bit string matches the control identifier, a control signal is output.

  Further, according to the embodiment of the present invention, the wireless device is a wireless device that performs wireless communication belonging to the access point in the infrastructure mode in normal operation, and includes a generation unit and a transmission unit. The generating means generates a radio frame so that transmission information to be transmitted is represented using the frame length of the radio frame. The transmission means transmits the radio frame with the modulation scheme, frame format, encryption scheme, and frame type fixed.

  Further, according to the embodiment of the present invention, the wireless device is a wireless device that performs wireless communication belonging to the access point in the infrastructure mode in normal operation, and includes a generation unit and a transmission unit. The generating means generates a radio frame so that transmission information to be transmitted is represented using the frame length of the radio frame. The transmission means repeatedly transmits a radio frame as many times as the number of combinations using a desired combination of a plurality of modulation schemes, a plurality of frame formats, a plurality of encryption schemes, and a plurality of frame types.

  Further, according to the embodiment of the present invention, the program to be executed by the computer is a program for causing the computer to transmit transmission information desired to be transmitted to the transmission destination, wherein the determining means includes a plurality of radio frames. A first step of determining a plurality of frame lengths so as to represent transmission information according to a calculation result calculated by applying a desired calculation method to the frame length of the frame, and a transmission means are determined in the first step And causing the computer to execute a second step of transmitting a plurality of radio frames having a plurality of frame lengths.

  Furthermore, according to the embodiment of the present invention, the program to be executed by the computer executes the reception of a plurality of radio frames transmitted from the radio apparatus according to any one of claims 1 to 4. A first means for receiving a plurality of radio frames, a second step for detecting a plurality of frame lengths of the plurality of radio frames, and a computing means A third step of applying a desired calculation method to a plurality of frame lengths detected by the detection means, and a decoding means for decoding the transmission information based on the calculation result calculated by the calculation means The computer executes the fourth step.

  Further, according to the embodiment of the present invention, the program executed by the computer is a program that causes the computer to execute transmission of a radio frame in a radio apparatus that performs radio communication belonging to an access point in an infrastructure mode in normal operation. When the control unit starts control of the control target device when the wireless link is not established between the wireless device and the access point or another wireless device in the infrastructure mode, the wireless device is wirelessly connected. A first step of shifting the frame to an autonomous transmission mode in which the frame can be transmitted autonomously; and a transmission means that specifies a control target device and sets a control identifier for controlling the control target device to a frame length of the radio frame. And the second step of transmitting the radio frame as shown. To be executed by the Yuta.

  Furthermore, according to an embodiment of the present invention, a program to be executed by a computer causes a computer to receive a radio frame transmitted by the radio device according to any one of claims 16, 24, and 25. A first step of receiving a radio frame transmitted by the radio apparatus according to any one of claims 16, 24, and 25 without controlling a communication parameter; A second step of detecting a received signal of the radio frame received by the receiving means and detecting a detection signal; and a third step of converting the detection signal into a bit string by determining a bit of the detection signal and converting the detection signal. The detection means causes the computer to execute a fourth step of detecting the frame length of the radio frame based on the bit string.

  According to the embodiment of the present invention, the radio apparatus sets a plurality of frame lengths so as to represent transmission information to be transmitted to the transmission destination by a calculation result calculated by applying a desired calculation method to the plurality of frame lengths. A plurality of radio frames having the determined plurality of frame lengths are transmitted. As a result, even if the plurality of frame lengths change due to wireless communication, the change in the frame length is removed from the calculation result obtained by applying a desired calculation method to the plurality of frame lengths.

  Accordingly, even if the frame length changes, a radio frame representing transmission information can be transmitted so that it can be received accurately.

  According to the embodiment of the present invention, the radio apparatus receives a plurality of radio frames and detects the received plurality of frame lengths. Then, the wireless device decodes transmission information based on a calculation result calculated by applying a desired calculation method to a plurality of frame lengths. As a result, even if the plurality of frame lengths change due to wireless communication, the change in the frame length is removed from the calculation result obtained by applying a desired calculation method to the plurality of frame lengths.

  Therefore, even if the frame length changes, a radio frame representing transmission information can be accurately received.

  Further, according to the embodiment of the present invention, the control-source wireless device that controls the device to be controlled generates a radio frame so that the control identifier is represented using the frame length of the radio frame, and the generated radio frame Is transmitted with the modulation method, frame format, encryption method and frame type fixed. As a result, the frame length of the radio frame does not vary.

  Therefore, the receiving side can receive a wireless frame having a waiting frame length, and the controlled unit can be accurately controlled.

  Further, according to the embodiment of the present invention, the control-source wireless device that controls the device to be controlled generates a radio frame so that the control identifier is represented using the frame length of the radio frame, and the generated radio frame Is repeatedly transmitted a number of times equal to the number of combinations using a desired combination of a plurality of modulation schemes, a plurality of frame formats, a plurality of encryption schemes, and a plurality of frame types. As a result, even if the frame length varies depending on the communication method, any of the plurality of bit strings decrypted using the desired combination of the modulation method, the frame format, the encryption method, and the frame type on the receiving side is Matches the control identifier.

  Therefore, the controlled unit can be accurately controlled even if the frame length varies depending on the communication method.

Furthermore, according to the embodiment of the present invention, when the control-source wireless device that controls the control target device does not establish a wireless link with another wireless device in the infrastructure mode, the wireless device enters the autonomous transmission mode. The wireless frame is transmitted so that the control identifier is expressed using the frame length of the wireless frame. That is, when the wireless device cannot transmit a wireless frame, the wireless device shifts to the autonomous transmission mode and transmits the wireless frame.

  Therefore, even when a radio frame cannot be transmitted, a radio frame for controlling the control target device can be transmitted.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic of the radio | wireless communications system by Embodiment 1 of this invention. It is the schematic which shows the structure of the radio | wireless apparatus shown in FIG. It is the schematic which shows the structure of the receiver shown in FIG. It is the schematic which shows the structure of the unnecessary wave removal circuit shown in FIG. It is a figure which shows the conversion table of the bit length and the frame length L which is the time length of a radio | wireless frame. It is a conceptual diagram of envelope detection and bit determination. It is a figure which shows the conversion table of a cumulative value and a bit string. FIG. 4 is a state transition diagram of the frame length determination circuit shown in FIG. 3 when the control identifier is composed of a plurality of radio frames. FIG. 4 is a specific configuration diagram of a bit determination device shown in FIG. 3. It is the schematic which shows the structure of PSDU. It is a figure for demonstrating a frame type. It is a conceptual diagram which shows the communication system in Embodiment 1 of this invention. It is the schematic which shows the specific example of the fixed communication system. It is a figure which shows the example of calculation of the payload size at the time of fixing a communication system. It is the schematic which shows the specific example of the communication system using all the combinations of a modulation system, a frame format, an encryption system, and a frame type. It is a conceptual diagram in the case of using the items a and e shown in FIG. It is a figure which shows the relationship between a transmission bit and differential frame length. It is a figure which shows the relationship between an accumulation value and frame length. It is a figure which shows the relationship between a transmission bit and differential frame length / reference value. It is a figure which shows the relationship between a transmission bit and differential frame length. It is a figure which shows the PSDU size of several radio | wireless frames when transmitting a transmission bit by difference frame length / reference value. It is a figure which shows another PSDU size of several radio | wireless frame when transmitting a transmission bit by difference frame length / reference value. FIG. 4 is a schematic diagram illustrating another configuration of the receiver illustrated in FIG. 3. It is the schematic which shows the structure of the synchronous detection circuit shown in FIG. FIG. 4 is a schematic diagram illustrating still another configuration of the receiver illustrated in FIG. 3. 2 is a flowchart for explaining the operation of the wireless communication system shown in FIG. 1. 6 is another flowchart for explaining the operation of the wireless communication system shown in FIG. 1. 6 is still another flowchart for explaining the operation of the wireless communication system shown in FIG. 1. 6 is still another flowchart for explaining the operation of the wireless communication system shown in FIG. 1. 6 is still another flowchart for explaining the operation of the wireless communication system shown in FIG. 1. 1 is a schematic diagram showing a specific example of a radio communication system according to Embodiment 1. FIG. 6 is a schematic diagram of a radio communication system according to a second embodiment. FIG. FIG. 33 is a schematic diagram illustrating a specific example of the wireless communication system illustrated in FIG. 32. 33 is a flowchart showing an operation of the wireless communication system shown in FIG. 6 is a schematic diagram of a radio communication system according to Embodiment 3. FIG. FIG. 36 is a schematic diagram illustrating a specific example of the wireless communication system illustrated in FIG. 35. FIG. 36 is a schematic diagram illustrating another specific example of the wireless communication system illustrated in FIG. 35. 36 is a flowchart showing an operation of the wireless communication system shown in FIG. FIG. 10 is a schematic diagram of a radio communication system according to a fourth embodiment. FIG. 40 is a schematic diagram illustrating a configuration of a wireless device illustrated in FIG. 39. It is the schematic which shows the structure of the receiver shown in FIG. 40 is a flowchart showing an operation of the wireless communication system shown in FIG. 39. 40 is another flowchart showing the operation of the wireless communication system shown in FIG. 39.

  Embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

[Embodiment 1]
FIG. 1 is a schematic diagram of a radio communication system according to Embodiment 1 of the present invention. Referring to FIG. 1, a wireless communication system 10 according to Embodiment 1 of the present invention includes a wireless device 1, receivers 2 to 4, and controlled units 5 to 7.

  The wireless device 1 performs wireless communication by belonging to an access point (not shown in FIG. 1) in the infrastructure mode in normal operation. And the radio | wireless apparatus 1 starts control of a to-be-controlled part (at least one of the to-be-controlled parts 5-7) when the radio link is not established between other wireless apparatuses other than an access point or an access point A wireless frame having a frame length representing a control identifier CID of a controlled unit (at least one of the controlled units 5 to 7). Broadcast to the receivers 2 to 4 corresponding to the controlled units 5 to 7, respectively.

  The control identifier CID is information for identifying the controlled part (any of the controlled parts 5 to 7) and controlling the controlled part (any of the controlled parts 5 to 7). Specific information for specifying the control unit (any of the controlled units 5 to 7) and control information indicating the control content of the controlled unit (any of the controlled units 5 to 7).

  The control information includes a control content for turning on the controlled portion (any of the controlled portions 5 to 7), a control content for turning off the controlled portion (any of the controlled portions 5 to 7), and a controlled portion (controlled) When any one of the units 5 to 7) is composed of illumination, the control content for adjusting the intensity of the illumination light is adjusted. Contents of control to be performed and control contents for adjusting the number of rotations of the motor when the controlled part (any of the controlled parts 5 to 7) is a motor. Therefore, each of the receivers 2 to 4 generates a control signal including this control content based on the control identifier CID, and outputs the generated control signal to the corresponding controlled units 5 to 7. The specific information and control information included in the control identifier CID are represented by a desired number of bits.

  Each of the receivers 2 to 4 receives, for example, 100 μW of power from a power source (not shown) and is driven by the received power. The receivers 2 to 4 receive a radio frame from the radio device 1, detect the received radio frame's received radio wave by envelope detection, detect the frame length of the radio frame, and convert the detected frame length into a bit string. When the converted bit string matches the control identifier CID of the controlled units 5 to 7, the control signal including the control content is generated based on the control identifier CID, and the generated control signal is associated with the corresponding controlled unit 5 Output to ~ 7.

  In this case, each of the receivers 2 to 4 holds a correspondence relationship between the bit values constituting the control information and the control contents, and refers to the correspondence relationship held to control the control identifier CID. A control content corresponding to the bit value constituting the information is detected, and a control signal including the detected control content is generated.

  The controlled units 5 to 7 are provided corresponding to the receivers 2 to 4, respectively. The controlled units 5 to 7 include, for example, a host system of a wireless device, illumination, a speaker, a monitor, a camera, a motor, and the like. And the controlled parts 5-7 will be controlled based on the received control signal, if a control signal is received from the corresponding receivers 2-4, respectively.

  The controlled units 5 to 7 constitute a “control target device”.

  FIG. 2 is a schematic diagram showing the configuration of the wireless device 1 shown in FIG. Referring to FIG. 2, radio apparatus 1 includes an antenna 11, a frame length modulation signal generation unit 12, and a host system 13.

  When receiving an instruction signal Comd1 for shifting to the infrastructure mode from the host system 13, the frame length modulation signal generation unit 12 shifts from the autonomous transmission mode to the infrastructure mode. Then, the frame length modulation signal generation unit 12 establishes a wireless link with the access point via the antenna 11 in the infrastructure mode, and performs wireless communication with the access point.

  Further, the frame length modulation signal generation unit 12 transmits an instruction signal Comd2 (“mode transition signal”) for transitioning to the autonomous transmission mode when the wireless link is not established with the access point in the infrastructure mode. When it is received from the host system 13, the infrastructure mode is shifted to the autonomous transmission mode. The frame length modulation signal generation unit 12 has a frame length representing a control identifier CID for controlling the controlled unit (at least one of the controlled units 5 to 7) and the frame length in the autonomous transmission mode. A communication method for transmitting a wireless frame is received from the host system 13 and a wireless frame having the received frame length is broadcast to the receivers 2 to 4 by the communication method received from the host system 13.

  The host system 13 holds control identifiers CID_A to CID_C of the controlled units 5 to 7 in advance. The control identifiers CID_A to CID_C are identifiers for specifying the controlled units 5 to 7 and controlling the controlled units 5 to 7, respectively.

  Further, the host system 13 generates an instruction signal Comd1 in normal operation, and outputs the generated instruction signal Comd1 to the frame length modulation signal generation unit 12.

Further, the host system 13 determines whether or not the wireless device 1 belongs to an access point when the frame length modulation signal generation unit 12 is operating in the infrastructure mode, or the wireless device 1 is a wireless device other than the access point. And whether or not a wireless link is established. In this case, when the host system 13 completes the association process with the access point, the host system 13 determines that the wireless device 1 belongs to the access point, and then receives the beacon frame from the access point for a certain period of time. It is determined that 1 does not belong to the access point. When the host system 13 completes the association process with the wireless device other than the access point, the host system 13 determines that the wireless device 1 has established a wireless link with the wireless device other than the access point. If no beacon frame is received from the wireless device, it is determined that the wireless device 1 has not established a wireless link with a wireless device other than the access point.

  In the host system 13, when the frame length modulation signal generation unit 12 is operating in the infrastructure mode, the wireless device 1 does not belong to the access point, and the wireless device 1 is a wireless device other than the access point. When it is determined that the wireless link has not been established, that is, when it is determined that the wireless device 1 has not established a wireless link with another wireless device, an instruction signal Comd2 is generated, and the generated instruction signal Comd2 is Output to the frame length modulation signal generator 12.

  Further, after the host system 13 outputs the instruction signal Comd1 to the frame length modulation signal generator 12, when the frame length modulation signal generator 12 establishes a wireless link with the access point, the host system 13 generates data and generates a frame length. The data is output to the modulation signal generation unit 12 and data is received from the frame length modulation signal generation unit 12.

  Further, after transmitting the instruction signal Comd2 to the frame length modulation signal generation unit 12, the host system 13 determines a frame length representing the control identifiers CID_A to CID_C and a communication method for transmitting a radio frame having the frame length. Output to the frame length modulation signal generator 12.

  FIG. 3 is a schematic diagram showing the configuration of the receiver 2 shown in FIG. Referring to FIG. 3, the receiver 2 includes an antenna 21, an unnecessary wave removal circuit 22, an envelope detection circuit 23, a bit determination unit 24, a frame length detection circuit 25, and a frame length determination circuit 26. Including.

  The unnecessary wave removal circuit 22 receives a radio wave via the antenna 21 and extracts a signal having the frequency of the radio frame from the received radio wave. Then, the unnecessary wave removal circuit 22 outputs the extracted signal to the envelope detection circuit 23.

  The envelope detection circuit 23 performs envelope detection on the signal received from the unnecessary wave removal circuit 22 and outputs the detected detection signal to the bit decision unit 24.

  The bit decision unit 24 converts the detection signal received from the envelope detection circuit 23 into a bit value of “0” or “1” every fixed period (for example, 8 μs), and the converted bit string is a frame length detection circuit. To 25.

  The frame length detection circuit 25 detects the frame length of the radio frame based on the bit string received from the bit determination unit 24. More specifically, the frame length detection circuit 25 accumulates the number of bit values of “1”, and when the bit value of “0” is input, the sum when the bit value of “0” is input. The value is output to the frame length determination circuit 26. Thereafter, the frame length detection circuit 25 resets the accumulated value.

  The frame length determination circuit 26 converts the cumulative value received from the frame length detection circuit 25 into a bit string by a method described later. Then, the frame length determination circuit 26 holds the converted bit string.

  Then, when the stored bit string matches the control identifier CID of the controlled unit 5, the frame length determination circuit 26 generates a control signal based on the control identifier CID and outputs the control signal to the controlled unit 5.

  In addition, when the bit length of the held bit string exceeds the length of the control identifier CID, the frame length determination circuit 26 discards the bit string in order from the oldest bit value.

  Each of the receivers 3 and 4 shown in FIG. 1 has the same configuration as that of the receiver 2 shown in FIG.

  FIG. 4 is a schematic diagram showing the configuration of the unnecessary wave removal circuit 22 shown in FIG. Referring to (a) of FIG. 4, the unnecessary wave removal circuit 22 includes a BPF (Band Pass Filter) 221. The BPF 221 receives a radio frame radio wave via the antenna 21, and passes a signal having a radio frame frequency from the received radio wave to the envelope detection circuit 23.

  Referring to (b) of FIG. 4, the unnecessary wave removal circuit 22 includes a frequency conversion circuit 222 and a BPF 223. The frequency conversion circuit 222 receives a radio frame radio wave via the antenna 21 and converts the frequency of the received radio wave into a frequency in the pass band of the BPF 223. Then, the frequency conversion circuit 222 outputs a radio wave having the converted frequency to the BPF 223.

  The BPF 223 receives a radio wave from the frequency conversion circuit 222 and outputs a radio wave having a frequency in its own pass band to the envelope detection circuit 23 among the received radio waves.

  Referring to FIG. 4C, the unnecessary wave removal circuit 22 includes a frequency conversion circuit 224 and an LPF (Low Pass Filter) 225. The frequency conversion circuit 224 receives a radio frame radio wave via the antenna 21 and converts the frequency of the received radio wave into a frequency in the pass band of the LPF 225. Then, the frequency conversion circuit 224 outputs the radio wave having the converted frequency to the LPF 225.

  The LPF 225 receives a radio wave from the frequency conversion circuit 224, and outputs a radio wave having a frequency equal to or lower than a certain frequency among the received radio waves to the envelope detection circuit 23.

  The unnecessary wave removing circuit 22 has a configuration shown in any of (a) to (c) of FIG.

  FIG. 5 is a diagram showing a conversion table between a bit string and a frame length L that is a time length of a radio frame. Referring to FIG. 5, conversion table TBL1 includes a bit string and a frame length. The bit string and the frame length are associated with each other.

  The frame length L of 896 μs is associated with the bit string “000000”. The frame length L of 928 (μs) is associated with the bit string “000001”. The frame length L of 960 (μs) is associated with the bit string “000010”. Similarly, the frame length L of 2912 (μs) is associated with the bit string “111110”, and the frame length L of 2944 (μs) is associated with the bit string “111111”. A bit string such as “000000” is a control identifier CID. That is, a bit string such as “000000” is a control identifier of a controlled unit to be controlled (at least one of the controlled units 5 to 7). In the bit string such as “000000”, 3 bits “000” from the head is identification information for specifying the controlled unit (at least one of the controlled units 5 to 7), and the latter 3 bits “000” "Is control information indicating the control content of the controlled unit (at least one of the controlled units 5 to 7).

  The host system 13 holds a conversion table TBL1. The host system 13 assigns a frame length L of 896 (μs) to the control identifier CID consisting of “000000” with reference to the conversion table TBL1.

Then, the host system 13 determines that the frame length is L = 896 (μs) and L = 896.
The communication method of the radio frame having the frame length of (μs) is output to the frame length modulation signal generation unit 12. Then, the frame length modulation signal generation unit 12 receives from the host system 13 a frame length of L = 896 (μs) and a communication method of a radio frame having a frame length of L = 896 (μs), and the received frame A radio frame having a length (= 896 (μs)) is broadcast to the receivers 2 to 4 by the communication method received from the host system 13.

  The host system 13 outputs the frame length and the communication method to the frame length modulation signal generation unit 12 in the same manner for the control identifier CID including “000001” and the like.

  As described above, the wireless device 1 broadcasts a wireless frame in which the control identifier CID is represented by a frame length to the receivers 2 to 4.

  In this case, the radio frame is composed of a management frame such as a probe request, a broadcast data frame, or a data frame to be transmitted to a radio apparatus other than the receivers 2 to 4.

  FIG. 6 is a conceptual diagram of envelope detection and bit determination. Referring to FIG. 6, the envelope detection circuit 23 of the receivers 2 to 4 receives the radio frame FR from the unnecessary wave removal circuit 22. The radio frame FR has a frame length L of 896 (μs), for example (see (a)).

  The envelope detection circuit 23 detects the envelope EVL of the radio frame FR, detects the detected envelope EVL every 8 (μs), and detects detection values I1 to I113 (see (b)).

  Then, the envelope detection circuit 23 outputs the detection values I1 to I113 to the bit determination unit 24. The bit determination unit 24 performs bit determination on the detection values I1 to I113, and obtains a bit string “111... 1110”. Then, the bit decision unit 24 outputs a bit string “111... 1110” to the frame length detection circuit 25.

  The frame length detection circuit 25 accumulates the number of bit values “1” from the beginning of the bit string “111... 1110” and detects the accumulated value “112”. Then, since the 113th bit value is “0”, the frame length detection circuit 25 outputs the accumulated value of “112” to the frame length determination circuit 26, and then resets the accumulated value.

  FIG. 7 is a diagram showing a conversion table between accumulated values and bit strings. Referring to FIG. 7, conversion table TBL2 includes cumulative values and bit strings. The accumulated value and the bit string are associated with each other.

  The bit string “000000” is associated with the accumulated value c of 111 ≦ c ≦ 113. The bit string “000001” is associated with the accumulated value c of 115 ≦ c ≦ 117. The bit string “000010” is associated with the accumulated value c of 119 ≦ c ≦ 121. Similarly, the bit string “111110” is associated with the accumulated value c of 363 ≦ c ≦ 365, and the bit string “111111” is associated with the accumulated value of 367 ≦ c ≦ 369.

  The frame length determination circuit 26 holds a conversion table TBL2. When the frame length determination circuit 26 receives the accumulated value c of “112” from the frame length detection circuit 25, the frame length determination circuit 26 refers to the conversion table TBL2 to detect the bit string “000000”.

  When the detected bit string “000000” matches the control identifier CID of the controlled unit (any of the controlled units 5 to 7), the frame length determination circuit 26 sends a control signal based on the control identifier CID. Generate and output to the controlled part (any of the controlled parts 5 to 7).

  FIG. 8 is a state transition diagram of the frame length determination circuit 26 shown in FIG. 3 when the control identifier CID is composed of a plurality of radio frames.

  The wireless device 1 may transmit the control identifier CID to the receivers 2 to 4 using a plurality of wireless frames. In that case, if the wireless frame transmitted from the wireless device other than the receivers 2 to 4 interrupts the wireless frame transmitted from the wireless device 1, the receivers 2 to 4 cannot correctly decode the control identifier CID.

In such a case, the frame length determination circuit 26 has the configuration shown in FIG. That is, the frame length decision circuit 26, _{c 1} wait state 261, _{c 2} wait state 262, ..., (the n 2 or more integer) _{c n} wait state 26n having.

c ₁ wait state 261～C _n wait state 26n, respectively, the cumulative value _{c 1,} c 2, a state of waiting ..., and _{c n.}

Frame length determining circuit 26 is initially located in the _{c 1} wait state 261, the cumulative value close to the accumulated value _{c 1} or _{c 1,} for _example, if _c 1 -1 and _c 1 +1 is input, _{c 2} wait state 262 Migrate to Then, when the cumulative value c ₂ or the cumulative value close to c ₂ is input, the frame length determination circuit 26 shifts to the c ₃ waiting state 263. In the same manner, the frame length decision circuit 26, if it is the accumulated value close to the accumulated value _c n -1, or _c n -1 is input, the process proceeds to _{c n} wait state 26n, the accumulated value _{c n} or _{c n} If a cumulative value close to is input, it is determined that the value matches the control identifier CID, a control signal is generated based on the control identifier CID, and is output to the controlled unit (one of the controlled units 5 to 7). As a result, the controlled unit (any of the controlled units 5 to 7) is controlled by the control signal.

As described above, when the control identifier CID is transmitted using a plurality of radio frames, the frame length determination circuit 26 performs control by detecting _n accumulated values c ₁ , c ₂ ,..., C _n. An identifier CID is detected.

On the other hand, the frame length decision circuit 26, for example, in _{c 2} wait state 262, the cumulative value close to the accumulated value _{c 2} or _{c 2} is close to a certain period, to be entered, or cumulative value _{c 2} or _{c 2} Cumulative if the accumulated value different from the value of m (m is an integer of 2 or more) input more times, it returns to c ₁ wait state 261 is the initial state. In other words, the frame length determination circuit 26 continuously inputs _n cumulative values c ₁ , c ₂ ,..., C _n even if the radio frame that is not the control identifier CID coincides with the cumulative value that happens to be waiting. if not, return to _{c 1} wait state 261 is the initial state.

The wireless device 1 is controlled identifier CID during transmission, if interrupted by a radio frame of another wireless device, the frame length decision circuit 26, for example, in c ₂ wait state 262, the accumulated close to the accumulated value c ₂ or c ₂ be input value different from the cumulative value, if the accumulated value of c ₂ are input before a certain period, or m times more different cumulative value is input, the state of waiting for the next accumulation value c ₃ Transition to the state.

  Therefore, even when the control identifier CID is transmitted using a plurality of radio frames by the frame length determination circuit 26 changing the state shown in FIG. 8, the control identifier CID can be correctly received, and the controlled units 5 to 7 are controlled. it can.

  FIG. 9 is a specific configuration diagram of the bit determination unit 24 shown in FIG. Referring to FIG. 9, bit determiner 24 includes a threshold determiner 241, a register 242, and a calculator 243.

The threshold value determiner 241 holds, in advance, a threshold value RSSI_th1 composed of −90 dBm, for example. Then, the threshold determination unit 241, bit determines detection value _I 1 _{~I 113} and the detection value _I 1 _{~I 113} received from the envelope detection circuit 23 is compared with a threshold RSSI_th1. That is, the threshold determiner 241, if the detection value _I 1 _{~I 113} threshold RSSI_th1 above, the detection value _I 1 _{~I 113} is converted into "1", than the detection value _I 1 _{~I 113} threshold RSSI_th1 If low, the detection values I _{1 to} I ₁₁₃ are converted to “0”.

  Then, the threshold determination unit 241 outputs a bit string including the converted bit value to the register 242 and the arithmetic unit 243.

  The register 242 holds the bit string received from the threshold determination unit 241 while shifting the bit string by one bit every cycle, and sequentially outputs the held bit string to the arithmetic unit 243.

  The arithmetic unit 243 sequentially receives each bit value of the bit string from the threshold value determiner 241 and sequentially receives each bit value delayed by one cycle from the register 242. Then, the arithmetic unit 243 calculates the logical sum (OR) of the two received bit values and outputs the calculation result to the frame length detection circuit 25.

  The space between frames in IEEE 802.11b is 30 μs or more. The envelope detection circuit 23 performs envelope detection every 8 μs, and the bit determination unit 24 performs bit determination every 8 μs. Accordingly, there are always two or more “0” s between radio frames. For this reason, if the result of bit determination is “101”, “0” has a high probability of being an error.

  However, since the bit decision unit 24 has the configuration shown in FIG. 9, the bit string “101” is corrected to “111”. Therefore, the bit determination unit 24 can reduce the bit error and perform bit determination by adopting the configuration shown in FIG.

  Since this bit error occurs in a fading environment, the bit determination unit 24 adopts the configuration shown in FIG. 9, whereby the bit error caused by fading can be reduced and bit determination can be performed.

  The frame length of the radio frame varies depending on communication parameters including a modulation scheme (transmission rate), a frame format, an encryption scheme, and a frame type.

  Therefore, in the first embodiment of the present invention, when the control identifier CID is transmitted according to the frame length, the mechanism in which the frame length does not change, or the receivers 2 to 4 accurately set the control identifier CID even if the frame length changes. Adopt a mechanism that can decrypt.

  The frame length is y (μs), the length of the physical header (= PLCP (Physical Layer Convergence Protocol) preamble + PLCP header length) is β (μs), and PSDU (Physical Layer Service Unit) size is x (Bye). Assuming that the transmission rate is α (Mbps), when α is α = 1, 2, 5.5, and 11 Mbps, the frame length y is expressed by the following equation.

y = 8x / α + β (1)
When α is α = 6, 9, 12, 18, 24, 36, 48, 54 Mbps, the frame length y is expressed by the following equation.

y = ceiling ((22 + 8x) / 4α) × 4 + β (2)
In Equation (2), ceiling (X) means the smallest integer equal to or greater than X.

  FIG. 10 is a schematic diagram showing the configuration of the PSDU. Referring to FIG. 10, PSDU includes a MAC (Media Access Control) header, a Frame Body, and an FCS (Frame Check Sum).

  The Frame Body includes an LLC header, an IP header, a UDP header, and a UDP payload. The LLC header has a length of 8 bytes, the IP header has a length of 20 bytes, the UDP header has a length of 8 bytes, and the UDP payload has an arbitrary length.

  The Frame Body has the minimum length when it consists of only the LLC header, and has the maximum length when it includes the LLC header, the IP header, the UDP header, and the UDP payload.

  The MAC header has a length of 24 bytes, and the FCS has a length of 4 bytes.

  Therefore, PSDU has a minimum length when Frame Body consists only of LLC header, and the minimum length is 36 bytes.

  The PSDU size x can be changed by changing the length of the Frame Body.

  Of the communication parameters that determine the frame length of a radio frame, the modulation scheme affects the transmission rate α, the frame format affects the physical header length β, and the encryption scheme and frame type are PSDU sizes. affects x.

  FIG. 11 is a diagram for explaining a frame type. Referring to FIG. 11, the access point and the wireless device may be compatible with WMM (WiFi Multimedia) or may not be compatible with WMM.

  WMM is a function that gives priority to data during wireless communication only for specific communication. For example, when there is VoIP data and normal data, the WMM is a function that prioritizes VoIP data that requires real-time performance.

If the access point is compatible with WMM, the wireless device is able to do QoS (Quality
of Service) Send the data frame to the access point. Then, the access point corresponding to WMM transmits a data frame to the wireless device (see (a) of FIG. 11).

  When the access point is not compatible with WMM, the wireless device and the access point transmit data frames to each other (see FIG. 11B).

  Furthermore, when the wireless device does not belong to the access point, the access point transmits a data frame (see FIG. 11C).

As described above, the frame type includes either a QoS data frame or a data frame. Therefore, in the first embodiment of the present invention, the frame type is QoS.
A communication method is determined using either a data frame or a data frame.

  FIG. 12 is a conceptual diagram showing a communication system in Embodiment 1 of the present invention. Referring to FIG. 12, items A1, B1, C1, D1, A2, B2, C2, and D2 are matters to be dealt with on the transmission side, and specifically, in frame length modulation signal generation unit 12 of wireless device 1. Realized. In this case, the frame length modulation signal generation unit 12 transmits the radio frame using the items A1, B1, C1, and D1 at the same time, transmits the radio frame using the items A2, B2, C2, and D2 at the same time, and transmits the item A1. , B1, C1, D1 and any combination of items A2, B2, C2, D2 (for example, A1, B2, C2, D1) is transmitted.

  Items a, b, c, d, e, and f are countermeasures on the receiving side, and are specifically realized by the frame length determination circuit 26 of the receivers 2 to 4. In this case, the frame length determination circuit 26 determines the frame length by using the items a, b, c, and d at the same time, determines the frame length by using the items a and e at the same time, and uses the item f by itself. Determine the length. The item e is a countermeasure that can absorb the fluctuation of the frame length y due to β, x, and the item f is a countermeasure that can absorb the fluctuation of the frame length y due to α, β, x.

(1) Communication method on the transmission side A1: Modulation method fixed In the autonomous transmission mode, the transmission rate α is any of 1, 2, 5.5, 6, 9, 11, 12, 18, 24, 36, 48, 54 Mbps. The wireless frame is broadcast to a MAC layer or an IP (Internet Protocol) layer.

B1: Frame format fixed In the autonomous transmission mode, the frame format is fixed to one of a long frame format, a short frame format, and an ultra short frame format, and a radio frame is broadcast on the MAC layer or the IP layer.

C1: Encryption method fixed In autonomous transmission mode, the encryption method is fixed to any of WEP, WPA / WPA2-AES, and WPA / WPA2-TKIP, and the wireless frame is broadcast on the MAC layer or IP layer. .

D1: Frame type fixed In the autonomous transmission mode, the frame type is fixed to either a data frame or a QoS data frame, and a radio frame is broadcast in the MAC layer or the IP layer.

A2: Round-the-clock modulation scheme In autonomous transmission mode, radio frames are created assuming transmission rates α of 1, 2, 5.5, 6, 9, 11, 12, 18, 24, 36, 48, and 54 Mbps. Broadcast on the MAC layer or IP layer.

B2: Round Frame Format In the autonomous transmission mode, a radio frame is created assuming a long frame format, a short frame format, and an ultra short frame format as a frame format, and is broadcast on the MAC layer or the IP layer.

C2: Round-robin encryption method In autonomous transmission mode, no encryption, WEP, WPA / WPA as the encryption method
2-AES and WPA / WPA2-TKIP are assumed and a radio frame is created and broadcast on the MAC layer or IP layer.

D2: Round frame type In the autonomous transmission mode, a radio frame is created assuming all data frames and QoS data frames as frame types, and broadcast in the MAC layer or IP layer.

(2) Determination method on the receiving side When the wireless device 1 transmits a wireless frame using the items A1, B1, C1, and D1 simultaneously, the frame length determination circuit 26 of the receivers 2 to 4 receives the items A1, B1. , C1 and D1, the cumulative value corresponding to the frame length transmitted using one transmission rate, one frame format, one encryption method and one frame type is calculated. It is determined whether or not a matching cumulative value has been received.

  When the wireless device 1 transmits a wireless frame using the items A2, B2, C2, and D2 at the same time, the frame length determination circuit 26 of the receivers 2 to 4 is described in the above items A2, B2, C2, and D2. Calculate multiple cumulative values corresponding to multiple frame lengths transmitted using all transmission rates, all frame formats, all encryption methods and all frame types, and It is determined whether or not a cumulative value that matches any one has been received.

  Further, when the wireless device 1 transmits a wireless frame without controlling all of the transmission speed, frame format, encryption method, and frame type, the frame length determination circuit 26 of the receivers 2 to 4 includes items a, b, Using c and d at the same time, a cumulative value corresponding to the frame length determined by the transmission parameter corresponding to a predetermined number of bytes (= PSDU size x) is waited, and a cumulative value that matches the standby cumulative value is waited for. It is determined whether or not it has been received.

  In this case, the number of bytes of the radio frame to be transmitted is determined in advance between the radio apparatus 1 and the receivers 2 to 4. The frame length determination circuit 26 of the receivers 2 to 4 uses a combination of all transmission rates, all frame formats, all encryption methods, and all frame types, and has a predetermined number of bytes. A plurality of frame lengths of a frame are calculated, and a plurality of accumulated values when the calculated plurality of frame lengths are obtained are calculated. Then, the frame length determination circuit 26 of the receivers 2 to 4 holds the calculated accumulated values as standby accumulated values, and is based on the received radio wave of the radio frame transmitted from the radio apparatus 1. If the obtained accumulated value matches any of the plurality of waiting accumulated values, it is determined that the waiting accumulated value has been received.

  Further, when the wireless device 1 uses all transmission rates and transmits a plurality of wireless frames without controlling the frame format, encryption method, and frame type, the frame length determination circuit 26 of the receivers 2 to 4 (= All transmission rates) and a plurality of frame lengths using item e, one or more differential frame lengths are calculated based on the calculated plurality of frame lengths, and the calculated one or more It is determined whether or not one or a plurality of difference frame lengths matching the difference frame length is received.

  Further, when the wireless device 1 transmits a wireless frame without controlling all of the transmission speed, frame format, encryption method, and frame type, the frame length determination circuit 26 of the receivers 2 to 4 uses the item f, Calculating one or more differential frame lengths / reference values and whether one or more differential frame lengths / reference values matching the calculated one or more differential frame lengths / reference values are received judge.

(I) Using Items A1, B1, C1, and D1 FIG. 13 is a schematic diagram showing a specific example of a fixed communication method. Referring to FIG. 13, the modulation scheme (transmission rate) α is set to any one of 1, 2, 5.5, 6, 9, 11, 12, 18, 24, 48, and 54 Mbps.

  When the modulation scheme (transmission rate) α is 1 Mbps, the frame format is set to the long frame format, and β is 192 μs.

  When the modulation method (transmission rate) α is any of 2, 5.5, and 11 Mbps, the frame format is set to either the long frame format or the short frame format. When the frame format is set to the long frame format, β is 192 μs, and when the frame format is set to the short frame format, β is 96 μs. That is, β is one of 96 μs and 192 μs. Then, the host system 13 of the wireless device 1 selects either the long frame format or the short frame format according to the system applied to the wireless device 1. That is, which of the long frame format and the short frame format is selected is determined by the system applied to the wireless device 1.

  Further, when the modulation method (transmission rate) α is any of 6, 9, 12, 18, 24, 48, and 54 Mbps, the frame format is any one of a long frame format, a short frame format, and an ultra short frame format. Is set. When the frame format is set to the long frame format, β is 204 μs, and when the frame format is set to the short frame format, β is 108 μs, and the frame format is set to the ultra short frame format. In this case, β is 20 μs. That is, β is an alternative of 20 μs, 108 μs, and 204 μs. Then, the host system 13 of the wireless device 1 selects one of the long frame format, the short frame format, and the ultra short frame format according to the system applied to the wireless device 1. That is, which of the long frame format, the short frame format, and the ultra short frame format is selected is determined by the system applied to the wireless device 1.

  When the encryption method is no encryption, the variation of Frame Body is set to ± 0 bytes, and the variation of PSDU size x is zero. When the encryption method is WEP, the change of Frame Body is set to +8 bytes, and the change of PSDU size x is +8 bytes. Further, when the encryption method is WPA / WPA2-AES, the change in Frame Body is set to +16 bytes, and the change in PSDU size x is +16 bytes. Further, when the encryption method is WPA / WPA2-TKIP, the change in Frame Body is set to +20 bytes, and the change in PSDU size x is +20 bytes. Therefore, the fluctuation of the PSDU size x is one of four choices of ± 0, +8, +16, +20 bytes for the encryption method.

  When the frame type is a data frame, the variation of Frame Body is set to ± 0 Byte, and the variation of PSDU size x is zero. When the frame type is a QoS data frame, the frame body variation is set to +2 bytes, and the PSDU size x variation is +2 bytes. Therefore, the fluctuation of the PSDU size x is one of ± 0 and +2 bytes for the frame type.

As a result, when no encryption is selected as the encryption method and a data frame is selected as the frame type, the fluctuation of the PSDU size x is zero, and no encryption is selected as the encryption method and QoS as the frame type. When a data frame is selected, the variation of PSDU size x is 0 + 2 = + 2 bytes. When WEP is selected as the encryption method and a data frame is selected as the frame type, the fluctuation of PSDU size x is + 8 + 0 = + 8 bytes, WEP is selected as the encryption method, and a QoS data frame is selected as the frame type. When selected, the variation of PSDU size x is + 8 + 2 = + 10 bytes. Furthermore, when WPA / WPA2-AES is selected as the encryption method and a data frame is selected as the frame type, the fluctuation of PSDU size x is + 16 + 0 = + 16 bytes, and WPA / WPA2-AES is selected as the encryption method. When the QoS data frame is selected as the frame type, the fluctuation of the PSDU size x is + 16 + 2 = + 18 bytes. Furthermore, when WPA / WPA2-TKIP is selected as the encryption method and a data frame is selected as the frame type, the variation of PSDU size x is + 20 + 0 = + 20 bytes, and WPA / WPA2-TKIP is selected as the encryption method. When the QoS data frame is selected as the frame type, the fluctuation of the PSDU size x is + 20 + 2 = + 22 bytes.

  When the control identifier CID is “000000”, the frame length L is 896 μs (see table TBL1 in FIG. 5). Therefore, it is assumed that a radio frame of 896 μs is transmitted as a UDP packet.

  When the transmission rate α is 1 Mbps, since β = 192 μs, 896 = 8x / 1 + 192, so x = 88 bytes. If the encryption method is WEP and the frame type is a QoS data frame, x = MAC header + (variation depending on frame type) + ((LLC header + IP header + UDP header + UDP payload) + (variation due to encryption method) + FCS Therefore, from 88 = 24 + 2 + ((8 + 20 + 8 + u) +8) +4, u = 14 bytes.

  Therefore, if a UDP packet having a payload size of 14 bytes is transmitted, a radio frame of 896 μs can be transmitted.

  When transmitting a wireless frame having a frame length of 896 μs, the host system 13 of the wireless apparatus 1 generates a UDP packet having a payload size of 14 bytes, the generated UDP packet, a transmission rate α = 1 Mbps, and β is 192 μs. The long frame format, the WEP encryption method, and the communication method composed of the QoS data frame type are output to the frame length modulation signal generation unit 12.

  Then, the frame length modulation signal generation unit 12 generates a PSDU of 24 + ((8 + 20 + 8 + 14)) + 4 = 78 bytes, and encrypts the generated PSDU by the WEP encryption method. Then, the frame length modulation signal generation unit 12 transmits a long frame format physical header with β = 192 μs at a transmission rate of 1 Mbps, and transmits the encrypted PSDU at a transmission rate of 1 Mbps using a QoS data frame. To do.

  As a result, a radio frame having a frame length of 896 μs is transmitted.

  Each of the receivers 2 to 4 calculates the accumulated value of “112” by the above-described method based on the received radio wave of the radio frame, and refers to the conversion table TBL2 to calculate the accumulated value of “112” as “ It is converted into a bit string of “000000”.

When WPA / WPA2-TKIP is selected as the encryption method and a QoS data frame is selected as the frame type, the fluctuation of PSDU size x due to the encryption method is +
The change in PSDU size x depending on the frame type is +2 bytes, but the PSDU size x is 88 bytes as described above, so 88 = 24 + 2 + ((8 + 20 + 20 + u) +8) + 4 = 86 + u, and encryption. Even if the fluctuation of the PSDU size x due to the method and the fluctuation of the PSDU size x due to the frame type are maximized, the payload size u of the UDP packet becomes u> 0.

  Select a value other than 1 Mbps as the modulation method (transmission rate) α, select a frame format other than the long frame format where β is 192 μs as the frame format, select an encryption method other than WEP as the encryption method, Similarly, when a QoS data frame is selected as the frame type, a radio frame having a frame length of 896 μs is transmitted.

  Similarly, radio frames having a frame length other than 896 μs are transmitted using various communication methods.

  FIG. 14 is a diagram illustrating an example of calculating the payload size when the communication method is fixed. In FIG. 14, the case where the transmission rate α is 1 Mbps and 2 Mbps is shown as an example in which the frame length y is expressed by Expression (1), and WPA / WPA2-TKIP is shown as the encryption method. A QoS data frame is shown as the frame type. In addition, as an example in which the frame length y is expressed by Expression (2), a case where the transmission rate α is 6 Mbps is shown, WPA / WPA2-TKIP is shown as an encryption method, and QoS data is used as a frame type. A frame is shown. Further, 896 μs and 928 μs are shown as examples of the frame length y.

  Furthermore, when the transmission rate α is 2 Mbps, β is either 192 μs or 96 μs, and thus indicates the payload size when both 192 μs and 96 μs are used as β.

  Furthermore, when the transmission rate α is 6 Mbps, β is any one of 204 μs, 108 μs, and 20 μs, and therefore indicates the payload size when all of 204 μs, 108 μs, and 20 μs are used as β.

  When the frame length y is expressed by equation (1) and the transmission rate α is 1 Mbps, the PSDU size x is calculated by substituting y = 896 μs or 928 μs, β = 192 μs, and α = 1 Mbps into equation (1). . Then, the calculated PSDU size x is substituted into x = 24 + 2 + ((8 + 20 + 20 + u) +8) + 4 = 86 + u to calculate the UDP payload size u.

  Further, when the frame length y is expressed by the equation (1) and the transmission rate α is 2 Mbps, the PSDU size is obtained by substituting y = 896 μs or 928 μs, β = 192 μs or 96 μs, and α = 2 Mbps into the equation (1). Calculate x. Then, the calculated PSDU size x is substituted into x = 24 + 2 + ((8 + 20 + 20 + u) +8) + 4 = 86 + u to calculate the UDP payload size u.

  Further, when the frame length y is expressed by equation (2) and the transmission rate α is 6 Mbps, y = 896 μs or 928 μs, β = 204 μs, 108 μs, 20 μs, and α = 6 Mbps in equation (2). Substitute and calculate PSDU size x. Then, the calculated PSDU size x is substituted into x = 24 + 2 + ((8 + 20 + 20 + u) +8) + 4 = 86 + u to calculate the UDP payload size u.

  Accordingly, the host system 13 of the wireless device 1 calculates the UDP payload size u by the above-described method, and uses the UDP packet having the calculated UDP payload size u and the communication method used for calculating the UDP payload size u as a frame. Output to the long modulation signal generator 12.

  Note that the UDP payload size u is similarly calculated even when the frame length, transmission rate α, encryption method, and frame type are other than the frame length, transmission rate α, encryption method, and frame type shown in FIG. The

(II) When Items A2, B2, C2, and D2 are Used FIG. 15 is a schematic diagram illustrating a specific example of a communication method using all combinations of a modulation method, a frame format, an encryption method, and a frame type. Referring to FIG. 15, there are 1 + 3 × 2 + 7 × 3 = 28 combinations of modulation schemes (transmission rates) α and β (frame format), and four encryption schemes for each of the 28 schemes. Since there are two frame types, all combinations are 28 × 4 × 2 = 224.

  The host system 13 of the wireless device 1 generates a UDP packet having a desired UDP payload size u, and outputs the generated UDP packet to the frame length modulation signal generation unit 12.

  The frame length modulation signal generation unit 12 broadcasts a radio frame including a UDP packet received from the host system 13 using the 224 communication methods described above.

  When the wireless device 1 transmits a wireless frame with a fixed communication method (when a wireless frame is transmitted using the items A1, B1, C1, and D1), the frame length of the wireless frame is fixed. In each of 2 to 4, the frame length determination circuit 26 calculates a cumulative value corresponding to the frame length using the fixed communication method, and whether or not a cumulative value that matches the calculated cumulative value has been received. Determine. When the wireless device 1 transmits a wireless frame with a fixed communication method, the frame length determination circuit 26 of the receivers 2 to 4 holds the communication method adopted by the wireless device 1 in advance.

  Further, when a radio frame is transmitted using a brute force communication method (when a radio frame is transmitted using items A2, B2, C2, and D2), each of the receivers 2 to 4 has a frame length determination circuit 26. Determines whether or not an accumulated value matching the waiting accumulated value has been received.

(III) When using items a and e FIG. 16 is a conceptual diagram when using items a and e shown in FIG. Referring to FIG. 16, wireless device 1 sequentially broadcasts a plurality of wireless frames FR1 to FR4 to receivers 2 to 4. In this case, the radio frames FR1 to FR4 have frame lengths L1 to L4, respectively.

  The wireless device 1 then broadcasts the wireless frames FR1 to FR4 sequentially to the receiver 2 by representing the control identifier CID not by the frame length but by the difference frame length that is the difference between the frame lengths of the two wireless frames. In this case, the wireless device 1 uses the frame length of any one of the wireless frames FR1 to FR4 as the reference frame length, and represents the control identifier CID by the difference between the reference frame length and each frame length.

For example, if the frame length of the radio frame immediately before each of the radio frames FR1 to FR4 is the reference frame length, the control identifier CID is represented by L2-L1, L3-L2, and L4-L3.

  Since the frame length y is expressed by Equation (1) or Equation (2), the variation of the frame length y due to β is completely eliminated by calculating the difference between the two frame lengths. Also, since the two radio frames are considered to be transmitted in the same radio communication environment, the variation in the frame length y due to the PSDU size x in the two radio frames is the same. Therefore, by calculating the difference between the two frame lengths, the variation in the frame length y due to the PSDU size x is also removed.

  Thus, by representing the control identifier CID by the differential frame length, it is possible to absorb the variation in the frame length y due to x and β.

  FIG. 17 is a diagram illustrating the relationship between the transmission bits and the difference frame length. Referring to FIG. 17, correspondence table TBL3 includes transmission bits and differential frame lengths. The transmission bit and the differential frame length are associated with each other.

  A transmission bit of “00” is associated with a difference frame length of ± 0 μs, a transmission bit of “01” is associated with a difference frame length of ± 40 μs, and a transmission bit of “10” is a difference of ± 80 μs. Corresponding to the frame length, the transmission bit of “11” is associated with a differential frame length of ± 120 μs.

  As a result, when the transmission bits “00”, “10”, “01”, “11” are sequentially transmitted, the frame length modulation signal generation unit 12 of the wireless device 1 performs w, w at a transmission rate α of 1 Mbps. , W + 10, w + 5, and w-10 Byte PSDU size x are sequentially transmitted.

When the transmission rate α is 1 Mbps, the frame length y is expressed by Equation (1). Therefore, if the frame lengths of two adjacent radio frames are y ₁ and y ₂ , y ₁ = 8x ₁ + β, y ₂ = 8x ₂ + β. As a result, y ₁ −y ₂ = 8 (x ₁ −x ₂ ).

Since the transmission bit of “00” is associated with the differential frame length of ± 0 μs, the differential frame length y ₁ -y ₂ when transmitting the transmission bit of “00” is ± 0 μs. As a result, the difference x ₁ −x ₂ becomes 0 bytes. Therefore, when transmitting a transmission bit of “00”, a radio frame having a PSDU size x of w (Byte) and a radio frame having a PSDU size x of w (Byte) are continuously transmitted.

Further, since the transmission bit of “10” is associated with the differential frame length of ± 80 μs, the differential frame length y ₁ -y ₂ when transmitting the transmission bit of “10” is ± 80 μs. As a result, the difference x ₁ −x ₂ is ± 80/8 = ± 10 bytes. Therefore, when transmitting a transmission bit of “10”, a radio frame having a PSDU size x of w + 10 (Byte) is transmitted following a radio frame having a PSDU size x of w (Byte).

Furthermore, since the transmission bit of “01” is associated with the differential frame length of ± 40 μs, the differential frame length y ₁ -y ₂ when transmitting the transmission bit of “01” is ± 40 μs. As a result, the difference x ₁ −x ₂ is ± 40/8 = ± 5 bytes. Therefore, when transmitting a transmission bit of “01”, a radio frame having a PSDU size x of w + 5 (Byte) is transmitted following a radio frame having a PSDU size x of w + 10 (Byte).

Furthermore, since the transmission bit of “11” is associated with the differential frame length of ± 120 μs, the differential frame length y ₁ -y ₂ when transmitting the transmission bit of “11” is ± 120 μs. As a result, the difference x ₁ −x ₂ becomes ± 120/8 = ± 15 bytes. Therefore, when a transmission bit of “11” is transmitted, a radio frame having a PSDU size x of w−10 (Byte) is transmitted following a radio frame having a PSDU size x of w + 5 (Byte).

  When transmitting transmission bits of “00”, “10”, “01”, “11” sequentially at a transmission rate α of 2 Mbps, the frame length modulation signal generation unit 12 of the wireless device 1 has a transmission rate α of 2 Mbps. Radio frames having PSDU size x of w, w, w + 20, w + 10, and w-20 bytes are sequentially transmitted.

When the transmission rate α is 2 Mbps, the frame length _y 1, _{y 2 becomes y 1 = 8x 1/2 +} β = 4x 1 + β, y 2 = 8x 2/2 + β = 4x 2 + β. As a result, y ₁ −y ₂ = 4 (x ₁ −x ₂ ).

  The description when the transmission bit “00” is transmitted at the transmission rate α of 2 Mbps is the same as the description when the transmission bit “00” is transmitted at the transmission rate α of 1 Mbps.

Since the transmission bit of “10” is associated with the differential frame length of ± 80 μs, the differential frame length y ₁ -y ₂ when transmitting the transmission bit of “10” is ± 80 μs. As a result, the difference x ₁ −x ₂ becomes ± 80/4 = ± 20 bytes. Therefore, when transmitting a transmission bit of “10”, a radio frame having a PSDU size x of w + 20 (Byte) is transmitted following a radio frame having a PSDU size x of w (Byte).

Further, since the transmission bit of “01” is associated with the differential frame length of ± 40 μs, the differential frame length y ₁ -y ₂ when transmitting the transmission bit of “01” is ± 40 μs. As a result, the difference x ₁ −x ₂ becomes ± 40/4 = ± 10 bytes. Therefore, when transmitting a transmission bit of “01”, a radio frame having a PSDU size x of w + 10 (Byte) is transmitted following a radio frame having a PSDU size x of w + 20 (Byte).

Furthermore, since the transmission bit of “11” is associated with the differential frame length of ± 120 μs, the differential frame length y ₁ -y ₂ when transmitting the transmission bit of “11” is ± 120 μs. As a result, the difference x ₁ −x ₂ is ± 120/4 = ± 30 bytes. Therefore, when a transmission bit of “11” is transmitted, a radio frame having a PSDU size of w−20 (Byte) is transmitted following a radio frame having a PSDU size of w + 10 (Byte).

When the transmission rate α is 1, 2, 5.5, and 11 Mbps, the frame length y is expressed by the equation (1). Therefore, x ₁ −x ₂ = (y ₁ −y ₂ ) × α / 8 Become.

  Therefore, when transmission bits of “00”, “10”, “01”, “11” are sequentially transmitted at a transmission rate α of 1, 2, 5.5, or 11 Mbps, the frame length modulation of the wireless device 1 is performed. The signal generator 12 sequentially transmits radio frames having PSDU size x of w, w, w + 10α, w + 5α, and w-10α (Byte).

  When “00”, “10”, “01”, “11” are sequentially transmitted at a transmission rate α of 6 Mbps, the frame length modulation signal generation unit 12 of the wireless device 1 performs w, w at a transmission rate α of 6 Mbps. , W + 60, w + 30, and w-60 (Bytes) are sequentially transmitted.

When the transmission rate α is 6 Mbps, the frame length y is expressed by Equation (2). Therefore, if the frame lengths of two adjacent radio frames are y ₁ and y ₂ , y ₁ = ceiling ((22 + 8x ₁ ) / 4 × 6) × 4 + β, y ₂ = ceiling ((22 + 8 × ₂ ) / 4 × 6) × 4 + β. As a result, y ₁ −y ₂ = ceiling [((22 + 8 × ₁ ) / 24) −ceiling ((22 + 8 × ₂ ) / 24)] × 4.

  The description when the transmission bit “00” is transmitted at the transmission rate α of 6 Mbps is the same as the description when the transmission bit “00” is transmitted at the transmission rate α of 1 Mbps.

Since the transmission bit of “10” is associated with the differential frame length of ± 80 μs, the differential frame length y ₁ -y ₂ when transmitting the transmission bit of “10” is ± 80 μs. As a result, the difference _{ceiling ((22 + 8x 1)} / 24) -ceiling ((22 + 8x 2) / 24) will ± 80/4 = ± 20Byte. When x ₁ = 36 Bytes, ceiling ((22 + 8x ₁ ) / 24) = ceiling ((22 + 8 × 36) / 24) = 13. Further, when x ₂ = 96 bytes, ceiling ((22 + 8 × ₂ ) / 24) = ceiling ((22 + 8 × 96) / 24) = 33. As a result, the absolute value of the difference ceiling ((22 + 8x ₁ ) / 24) -ceiling ((22 + 8x ₂ ) / 24) is | 13−33 | = 20 bytes. Therefore, when transmitting a transmission bit of “10”, since x ₂ −x ₁ = 96−36 = 60 bytes, a radio frame having a PSDU size x of w + 60 (bytes) has a PSDU size x of w (bytes). It is transmitted following the radio frame it has.

Further, since the transmission bit of “01” is associated with the differential frame length of ± 40 μs, the differential frame length y ₁ -y ₂ when transmitting the transmission bit of “01” is ± 40 μs. As a result, the difference _{ceiling ((22 + 8x 1)} / 24) -ceiling ((22 + 8x 2) / 24) will ± 40/4 = ± 10Byte. When x ₁ = 36 Bytes, ceiling ((22 + 8x ₁ ) / 24) = ceiling ((22 + 8 × 36) / 24) = 13. Also, when x ₂ = 66 bytes, ceiling ((22 + 8x ₂ ) / 24) = ceiling ((22 + 8 × 66) / 24) = 23. As a result, the absolute value of the difference _{ceiling ((22 + 8x 1)} / 24) -ceiling ((22 + 8x 2) / 24) is, | 13-23 | = a 10 bytes. Therefore, when transmitting a transmission bit of “01”, since x ₂ −x ₁ = 66−36 = 30 bytes, a radio frame having a PSDU size x of w + 30 (bytes) has a PSDU size x of w + 60 (bytes). It is transmitted following the radio frame it has.

Furthermore, since the transmission bit of “11” is associated with the differential frame length of ± 120 μs, the differential frame length y ₁ -y ₂ when transmitting the transmission bit of “11” is ± 120 μs. As a result, the difference _{ceiling ((22 + 8x 1)} / 24) -ceiling ((22 + 8x 2) / 24) will ± 120/4 = ± 30Byte. When x ₁ = 36 Bytes, ceiling ((22 + 8x ₁ ) / 24) = ceiling ((22 + 8 × 36) / 24) = 13. Further, when x ₂ = 126 Bytes, ceiling ((22 + 8 × ₂ ) / 24) = ceiling ((22 + 8 × 126) / 24) = 43. As a result, the absolute value of the difference _{ceiling ((22 + 8x 1)} / 24) -ceiling ((22 + 8x 2) / 24) is, | 13-43 | = a 30 bytes. Therefore, when transmitting a transmission bit of “11”, since x ₂ −x ₁ = 126−36 = 90 bytes, a radio frame having a PSDU size x of w−60 (bytes) is a PSDU size of w + 30 (bytes). transmitted following a radio frame with x.

When transmitting transmission bits of “00”, “10”, “01”, “11” sequentially at a transmission rate α of 9 Mbps, the frame length modulation signal generation unit 12 of the wireless device 1 has a transmission rate α of 9 Mbps, Radio frames having PSDU sizes of w, w, w + 90, w + 45, and w−90 (Byte) are sequentially transmitted.

When the transmission rate α is 9 Mbps, the frame lengths y ₁ and y ₂ are y ₁ = ceiling ((22 + 8x ₁ ) / 4 × 9) × 4 + β = ceiling ((22 + 8x ₁ ) / 36) × 4 + β, y ₂ = Ceiling ((22 + 8 × ₂ ) / 4 × 9) × 4 + β = ceiling ((22 + 8 × ₂ ) / 4 × 9) × 4 + β. As a result, y ₁ −y ₂ = ceiling [((22 + 8 × ₁ ) / 36) −ceiling ((22 + 8 × ₂ ) / 36)] × 4.

  The description when the transmission bit “00” is transmitted at the transmission rate α of 9 Mbps is the same as the description when the transmission bit “00” is transmitted at the transmission rate α of 6 Mbps.

Since the transmission bit of “10” is associated with the differential frame length of ± 80 μs, the differential frame length y ₁ -y ₂ when transmitting the transmission bit of “10” is ± 80 μs. As a result, the difference _{ceiling ((22 + 8x 1)} / 36) -ceiling ((22 + 8x 2) / 36) will ± 80/4 = ± 20Byte. When x ₁ = 36 bytes, ceiling ((22 + 8x ₁ ) / 36) = ceiling ((22 + 8 × 36) / 36) = 9. Further, when x ₂ = 126 Bytes, ceiling ((22 + 8x ₂ ) / 36) = ceiling ((22 + 8 × 126) / 36) = 29. As a result, the absolute value of the difference _{ceiling ((22 + 8x 1)} / 36) -ceiling ((22 + 8x 2) / 36) is, | 9-29 | = a 20 Bytes. Therefore, when transmitting a transmission bit of “10”, since x ₂ −x ₁ = 126−36 = 90 bytes, a radio frame having a PSDU size x of w + 90 (bytes) has a PSDU size of w (bytes). It is transmitted following the radio frame.

Further, since the transmission bit of “01” is associated with the differential frame length of ± 40 μs, the differential frame length y ₁ -y ₂ when transmitting the transmission bit of “01” is ± 40 μs. As a result, the difference _{ceiling ((22 + 8x 1)} / 36) -ceiling ((22 + 8x 2) / 36) will ± 40/4 = ± 10Byte. When x ₁ = 126 Bytes, ceiling ((22 + 8x ₁ ) / 36) = ceiling ((22 + 8 × 126) / 36) = 29. Further, when x ₂ = 171 Bytes, ceiling ((22 + 8x ₂ ) / 36) = ceiling ((22 + 8 × 171) / 36) = 39. As a result, the absolute value of the difference ceiling ((22 + 8x ₁ ) / 36) -ceiling ((22 + 8x ₂ ) / 36) is | 29−39 | = 10 bytes. Therefore, when transmitting a transmission bit of “01”, since x ₂ −x ₁ = 171−126 = 45 bytes, a radio frame having a PSDU size x of w + 45 (bytes) has a PSDU size x of w + 90 (bytes). It is transmitted following the radio frame it has.

Furthermore, since the transmission bit of “11” is associated with the differential frame length of ± 120 μs, the differential frame length y ₁ -y ₂ when transmitting the transmission bit of “11” is ± 120 μs. As a result, the difference _{ceiling ((22 + 8x 1)} / 36) -ceiling ((22 + 8x 2) / 36) will ± 120/4 = ± 30Byte. When x ₁ = 171 Bytes, ceiling ((22 + 8x ₁ ) / 36) = ceiling ((22 + 8 × 171) / 36) = 39. Further, when x ₂ = 306 bytes, ceiling ((22 + 8 × ₂ ) / 36) = ceiling ((22 + 8 × 306) / 36) = 69. As a result, the absolute value of the difference _{ceiling ((22 + 8x 1)} / 36) -ceiling ((22 + 8x 2) / 36) is, | 39-69 | = a 30 bytes. Therefore, when transmitting the transmission bit of “11”, x ₂ −x ₁ = 306−171 = 135 Byte
Since e, a radio frame having a PSDU size x of w-90 (Byte) is transmitted following a radio frame having a PSDU size X of w + 45 (Byte).

  Therefore, when transmitting transmission bits of “00”, “10”, “01”, “11” sequentially at any transmission speed α of 6, 9, 12, 18, 24, 36, 48, 54 Mbps, The frame length modulation signal generation unit 12 of the device 1 sequentially transmits radio frames having PSDU sizes x of w, w, w + 10α, w + 5α, and w-10α.

  Then, the frame length modulation signal generation unit 12 of the wireless device 1 has the transmission rate α of 6, 9, 12, 18, 24, even when the transmission rate α is 1, 2, 5.5, or 11 Mbps. Even in the case of any of 36, 48, and 54 Mbps, by sequentially transmitting radio frames having PSDU size x of w, w, w + 10α, w + 5α, and w−10α (Byte), “00”, “10”, Transmission bits “01” and “11” can be transmitted sequentially.

  As described above, when the frame length of the previous radio frame is set as the reference frame length, the frame length modulation signal generation unit 12 of the radio apparatus 1 has 1, 2, 5.5, 6, 9, 11, 12, By sequentially transmitting radio frames having PSDU size x of w, w, w + 10α, w + 5α, w−10α (Byte) at a transmission rate α of 18, 24, 36, 48, 54 Mbps, “00”, Transmission bits “10”, “01”, and “11” can be transmitted sequentially.

  Further, the frame length modulation signal generation unit 12 of the wireless device 1 transmits the transmission bits “00”, “01”, “10”, “11” in the order of “00”, “11”, “01”, “10”. In this case, radio frames having PSDU size x of w, w, w + 15α, w + 10α, and w (Byte) are sequentially transmitted. As shown in FIG. 17, the transmission bits of “00”, “01”, “10”, and “11” are associated with differential frame lengths of ± 0, ± 40, ± 80, and ± 120 μs, respectively. Adjacent so that the difference frame length from the frame length (= reference frame length) of the previous radio frame becomes a difference frame length corresponding to “00”, “01”, “10”, “11”, respectively. This is because the PSDU size x that determines the two frame lengths may be determined.

  According to such a method, transmission bits of “00”, “01”, “10”, and “11” can be transmitted in an arbitrary order using the difference frame length between two adjacent radio frames.

  In the above description, the frame length of the previous radio frame is the reference frame length. However, in Embodiment 1 of the present invention, the reference frame length is not limited to this, and the reference frame length is one after each radio frame. May be the frame length of the radio frame two times before each radio frame, the frame length of the radio frame two times after each radio frame, Generally, the frame length of any one radio frame of a plurality of radio frames used when transmitting the bit value constituting the control identifier CID by 2 bits may be set as the reference frame length.

  In the above description, the transmission bits of “00”, “01”, “10”, and “11” are associated with the difference frame lengths of ± 0, ± 40, ± 80, and ± 120 μs, respectively. However, in the first embodiment of the present invention, the transmission bits of “00”, “01”, “10”, “11” are ± 0, ± 80, ± 160. , ± 240 μs, may be associated with differential frame lengths of ± 0, ± 160, ± 320, ± 480 μs, and generally ± 0, ± 8 × p. , ± (8 × p) × 2, ± (8 × p) × 3 μs (p = 5, 10, 15,...).

  Further, when four radio frames FR1 to FR4 are transmitted, the control identifier CID is represented by three differential frame lengths, and one differential frame length is associated with 2 bits. Further, the number of bits of the control identifier CID is 2 bits or more. Therefore, when the number of bits of the control identifier CID is K (K is an even number equal to or greater than 2), the wireless device 1 sequentially broadcasts (K / 2) +1 wireless frames to the receiver 2. Here, if i = (K / 2) +1, i is an integer of 2 or more.

  When the number of bits of the control identifier CID is 2 bits, the leading bit value of the 2-bit bit value is identification information that identifies the controlled unit (any of the controlled units 5 to 7). Of the bit values of the bits, the last bit value is control information indicating the control content of the controlled unit (any of the controlled units 5 to 7). In this case, there are two controlled parts and two control contents. If there are two control contents, ON / OFF of the controlled part can be controlled. Therefore, the number of bits of the control identifier CID may be 2 bits or more. And the radio | wireless apparatus 1 should just broadcast two or more radio frames.

  When the number of bits of the control identifier CID is 2 bits, the control identifier CID is represented by one differential frame length. The number of bits of the control identifier CID is 2 bits or more. Therefore, when the control identifier CID is represented by a difference frame length, the control identifier CID is represented by one or more difference frame lengths.

  FIG. 18 is a diagram illustrating the relationship between the accumulated value and the frame length. Referring to FIG. 18, correspondence table TBL4 includes cumulative values and frame lengths. The accumulated value and the frame length are associated with each other.

  The accumulated value c of 111 ≦ c ≦ 113 is associated with a frame length of 896 μs. The accumulated value c of 115 ≦ c ≦ 117 is associated with a frame length of 928 μs. The accumulated value c of 119 ≦ c ≦ 121 is associated with a frame length of 960 μs. Similarly, the cumulative value c of 363 ≦ c ≦ 365 is associated with the frame length of 2912 μs, and the cumulative value of 367 ≦ c ≦ 369 is associated with the frame length of 2944 μs.

  When the items a and e are used, the frame length detection circuit 25 of the receivers 2 to 4 holds the correspondence table TBL4 shown in FIG. 18 in advance, and the frame length determination circuit 26 of the receivers 2 to 4 A correspondence table TBL3 shown in FIG.

  The frame length detection circuits 25 of the receivers 2 to 4 detect a plurality of accumulated values corresponding to a plurality of radio frames by the above-described method, and refer to the correspondence table TBL4 to determine the plurality of accumulated values detected. And the converted plurality of frame lengths are output to the frame length determination circuit 26.

  Then, the frame length determination circuit 26 detects one or a plurality of difference frame lengths between each of the plurality of frame lengths received from the frame length detection circuit 25 and the reference frame length, and refers to the correspondence table TBL3. Each of the detected one or more differential frame lengths is converted into a transmission bit to obtain a bit string. Then, when the acquired bit string matches the control identifier CID of the controlled units 5 to 7, the frame length determination circuit 26 generates a control signal based on the control identifier CID, and uses the generated control signal as the controlled unit. Send to 5-7.

  Thereby, even when the control identifier CID is represented by the difference frame length, the controlled units 5 to 7 can be controlled.

(IV) When Item f is Used When the item f shown in FIG. 12 is used, the frame length modulation signal generation unit 12 of the wireless device 1 uses a plurality of methods in the same manner as when the items a and e shown in FIG. Radio frames FR1 to FR4 are transmitted to receivers 2 to 4.

  Then, the wireless device 1 represents the control identifier CID by the difference frame length / reference value obtained by dividing the difference frame length from the reference frame length by the reference value instead of the frame length, and represents the wireless frames FR1 to FR4 as the receivers 2 to 4 Broadcast sequentially.

  In this case, the wireless device 1 uses the frame length of any one of the wireless frames FR1 to FR4 as the reference frame length, and divides the difference frame length between the reference frame length and each frame length by the reference value. The control identifier CID is represented by the difference frame length / reference value.

  For example, when the frame length of the previous radio frame is the reference frame length and the previous differential frame length is the reference value, the control identifier CID is (L3-L2) / (L2-L1), (L4 -L3) / (L3-L2).

  By using the differential frame length, as described above, the fluctuation of the frame length y due to β and x can be absorbed. Then, by dividing the difference frame length by the reference value (= difference frame length), the ratio of the term of 8x / α in Equation (1) or the ratio of the term of ((22 + 8x) / 4α) in Equation (2). Therefore, the fluctuation of the frame length y due to the transmission rate α can be absorbed.

  Thus, by representing the control identifier CID by the difference frame length / reference value, it is possible to absorb variations in the frame length y due to α, β, and x.

  FIG. 19 is a diagram illustrating the relationship between transmission bits and differential frame length / reference value. Referring to FIG. 19, correspondence table TBL5 includes transmission bits and differential frame length / reference value. The transmission bit and the difference frame length / reference value are associated with each other.

  A transmission bit of “00” is associated with a difference frame length / reference value of ± 1, a transmission bit of “01” is associated with a difference frame length / reference value of ± 2, and a transmission bit of “10”. Are associated with a difference frame length / reference value of ± 3, and a transmission bit of “11” is associated with a difference frame length / reference value of ± 4.

  As a result, when the transmission bits “00”, “10”, “01”, “11” are sequentially transmitted, the frame length modulation signal generation unit 12 of the wireless device 1 uses the transmission rate α of 1 Mbps and w, w + 16. , W + 16 × 2, w + 16 × 5, w−16 × 1, and w−16 × 25 (Byte), a plurality of radio frames are sequentially transmitted.

When the transmission rate α is 1 Mbps, three consecutive frame lengths y ₁ , y ₂ , y ₃ are y ₁ = 8x ₁ + β, y ₂ = 8x ₂ + β, and y ₃ = 8x ₃ + β, respectively. . As a result, (y ₃ −y ₂ ) / (y ₂ −y ₁ ) = (x ₃ −x ₂ ) / (x ₂ −x ₁ ).

Since the transmission bit of “00” is associated with the difference frame length / reference value of ± 1, the difference frame length / reference value when transmitting the transmission bit of “00” is ± 1. As a result, (x ₃ −x ₂ ) / (x ₂ −x ₁ ) is ± 1. Therefore, when transmitting a transmission bit of “00”, a radio frame having a PSDU size x of w (Byte), a radio frame having a PSDU size x of w + 16 (Byte), and a PSDU size of w + 16 × 2 (Byte) Radio frames having x are continuously transmitted.

Since the transmission bit of “10” is associated with the difference frame length / reference value of ± 3, the difference frame length / reference value when transmitting the transmission bit of “10” is ± 3. As a result, (x ₃ −x ₂ ) / (x ₂ −x ₁ ) is ± 3. Therefore, when transmitting a transmission bit of “10”, a radio frame having a PSDU size of w + 16 (Byte), a radio frame having a PSDU size of w + 16 × 2 (Byte), and a PSDU size of w + 16 × 5 (Byte) Are continuously transmitted.

Furthermore, since the transmission bit of “01” is associated with the difference frame length / reference value of ± 2, the difference frame length / reference value when transmitting the transmission bit of “01” is ± 2. As a result, (x ₃ −x ₂ ) / (x ₂ −x ₁ ) is ± 2. Therefore, when transmitting a transmission bit of “01”, a radio frame having a PSDU size of w + 16 × 2 (Byte), a radio frame having a PSDU size of w + 16 × 5 (Byte), and w−16 × 1 (Byte) ) Radio frames having a PSDU size of.

Further, since the transmission bit of “11” is associated with the difference frame length / reference value of ± 4, the difference frame length / reference value when transmitting the transmission bit of “01” is ± 4. As a result, (x ₃ −x ₂ ) / (x ₂ −x ₁ ) is ± 4. Accordingly, when transmitting a transmission bit of “11”, a radio frame having a PSDU size of w + 16 × 5 (Byte), a radio frame having a PSDU size of w−16 × 1 (Byte), and w−16 × 25 A radio frame having a PSDU size of (Byte) is continuously transmitted.

  In addition, when transmitting transmission bits of “00”, “11”, “10”, “01” sequentially, the frame length modulation signal generation unit 12 of the wireless device 1 uses the transmission rate α of 1 Mbps, w, w− A plurality of radio frames having a PSDU size x of 16, w-16 × 2, w + 16 × 2, w-16 × 10, and w + 16 × 14 bytes are sequentially transmitted.

  When transmitting transmission bits “00”, “10”, “01”, and “11” sequentially at a transmission rate α of 6 Mbps, the frame length modulation signal generation unit 12 of the wireless device 1 has a transmission rate α of 6 Mbps. , W, w-16, w, w + 46, w + 136, w + 496 bytes, a plurality of radio frames having a PSDU size x are sequentially transmitted.

  FIG. 20 is a diagram illustrating the relationship between the transmission bit and the difference frame length. Referring to FIG. 20, correspondence table TBL6 includes transmission bits and differential frame lengths. The transmission bit and the differential frame length are associated with each other.

  The transmission bit “00” is associated with ± 1 × (reference value), the transmission bit “01” is associated with ± 2 × (reference value), and the transmission bit “10” is ± 3. Corresponding to × (reference value), the transmission bit of “11” is correlated to ± 4 × (reference value).

  As a result, when the transmission bits “00”, “10”, “01”, “11” are sequentially transmitted, the frame length modulation signal generation unit 12 of the wireless device 1 uses the transmission rate α of 1 Mbps and w, w + 16. , W + 16 × 2, w + 16 × 5, w−16 × 1, and w−16 × 25 (Byte), a plurality of radio frames are sequentially transmitted.

When the transmission rate α is 1 Mbps, three consecutive frame lengths y ₁ , y ₂ , y ₃ are y ₁ = 8x ₁ + β, y ₂ = 8x ₂ + β, and y ₃ = 8x ₃ + β, respectively. . As a result, (y ₃ −y ₂ ) = (x ₃ −x ₂ ) and (y ₂ −y ₁ ) = (x ₂ −x ₁ ) are obtained.

Since the transmission bit of “00” is associated with ± 1 × (reference value), the difference frame length when transmitting the transmission bit of “00” is ± 1 × (reference value). As a result, (x ₃ −x ₂ ) becomes ± 1 × (x ₂ −x ₁ ). Therefore, when transmitting a transmission bit of “00”, a radio frame having a PSDU size x of w (Byte), a radio frame having a PSDU size x of w + 16 (Byte), and a PSDU size of w + 16 × 2 (Byte) Radio frames having x are continuously transmitted.

Further, since the transmission bit of “10” is associated with ± 3 × (reference value), the difference frame length when transmitting the transmission bit of “10” is ± 3 × (reference value). As a result, (x ₃ −x ₂ ) becomes ± 3 (x ₂ −x ₁ ). Therefore, when transmitting a transmission bit of “10”, a radio frame having a PSDU size of w + 16 (Byte), a radio frame having a PSDU size of w + 16 × 2 (Byte), and a PSDU size of w + 16 × 5 (Byte) Are continuously transmitted.

Further, since the transmission bit of “01” is associated with ± 2 × (reference value), the difference frame length when transmitting the transmission bit of “01” is ± 2 × (reference value). As a result, (x ₃ −x ₂ ) becomes ± 2 × (x ₂ −x ₁ ). Therefore, when transmitting a transmission bit of “01”, a radio frame having a PSDU size of w + 16 × 2 (Byte), a radio frame having a PSDU size of w + 16 × 5 (Byte), and w−16 × 1 (Byte) ) Radio frames having a PSDU size of.

Furthermore, since the transmission bit “11” is associated with ± 4 × (reference value), the difference frame length when transmitting the transmission bit “01” is ± 4 × (reference value). As a result, (x ₃ −x ₂ ) becomes ± 4 × (x ₂ −x ₁ ). Accordingly, when transmitting a transmission bit of “11”, a radio frame having a PSDU size of w + 16 × 5 (Byte), a radio frame having a PSDU size of w−16 × 1 (Byte), and w−16 × 25 A radio frame having a PSDU size of (Byte) is continuously transmitted.

  In addition, when transmitting transmission bits of “00”, “11”, “10”, “01” sequentially, the frame length modulation signal generation unit 12 of the wireless device 1 uses the transmission rate α of 1 Mbps, w, w− A plurality of radio frames having a PSDU size x of 16, w-16 × 2, w + 16 × 2, w-16 × 10, and w + 16 × 14 bytes are sequentially transmitted.

  When transmitting transmission bits “00”, “10”, “01”, and “11” sequentially at a transmission rate α of 6 Mbps, the frame length modulation signal generation unit 12 of the wireless device 1 has a transmission rate α of 6 Mbps. , W, w-16, w, w + 46, w + 136, w + 496 bytes, a plurality of radio frames having a PSDU size x are sequentially transmitted.

FIG. 21 is a diagram illustrating PSDU sizes x of a plurality of radio frames when transmitting transmission bits according to the difference frame length / reference value. Note that X _{1 to} X ₆ shown in FIG. 21 are values of ceiling ((22 + 8x) / 4α) when the transmission rate α is 6 Mbps.

  When transmitting transmission bits of “00”, “10”, “01”, “11” by representing the difference frame length / reference value, the frame length modulation signal generation unit 12 of the wireless device 1 uses six wireless frames. Are sent sequentially.

Assuming that the frame lengths of the six radio frames are y ₁ , y ₂ , y ₃ , y ₄ , y ₅ , y ₆ , when the transmission rate α is 6 Mbps, the frame length y is expressed by Equation (2). Therefore, the frame lengths y ₁ , y ₂ , y ₃ , y ₄ , y ₅ and y ₆ are respectively y ₁ = ceiling ((22 + 8x ₁ ) / 24) × 4 + β, y ₂ = ceiling ((22 + 8x ₂ ) / 24) × 4 + β, y ₃ = ceiling ((22 + 8x ₃ ) / 24) × 4 + β, y ₄ = ceil
ing ((22 + 8x ₄ ) / 24) × 4 + β, y ₅ = ceiling ((22 + 8x ₅ ) / 24) × 4 + β and y ₆ = ceiling ((22 + 8x ₆ ) / 24) × 4 + β.

  When the transmission bit is expressed by the difference frame length / reference value, β is eliminated because the difference frame length of two adjacent radio frames is calculated. Further, when the difference frame length is divided by the reference value, the reference value is also expressed by the difference frame length, so that “4” of the ceiling ((22 + 8x) / 24) × 4 is also deleted.

Therefore, X ₁ = ceiling ((22 + 8x ₁ ) / 24), X ₂ = ceiling ((22 + 8x ₂ ) / 24), X ₃ = ceiling ((22 + 8x ₃ ) / 24), X ₄ = ceiling ((22 + 8x ₄ ) / 24), X ₅ = ceiling ((22 + 8x ₅ ) / 24) and X ₆ = ceiling ((22 + 8x ₆ ) / 24).

For example, if x ₁ = w = 32 bytes, x ₂ = w−16 = 32−16 = 16, x ₃ = w = 32, x ₄ = w + 46 = 32 + 46 = 78, x ₅ = w + 136 = 32 + 136 = 168, and x ₆ = w + 496 = 32 + 496 = 528 Bytes.

When X _{1 to} X ₆ are calculated using x ₁ = 32, x ₂ = 16, x ₃ = 32, x ₄ = 78, x ₅ = 168, and x ₆ = 528 Bytes, X ₁ = 12, X ₂ = 7, X ₃ = 12, X ₄ = 27, X ₅ = 57 and X ₆ = 177 (see FIG. 21).

Since the transmission bit “00” transmitted first is represented by (y ₃ −y ₂ ) / (y ₂ −y ₁ ) = (X ₃ −X ₂ ) / (X ₂ −X ₁ ), X ₁ using the values of _X 2, _{X 3,} when _{(X 3 -X 2) / (} X 2 -X 1) to calculate _{a, (X 3 -X 2) /} (X 2 -X 1) = (12 −7) / (7-12) = 5 / −5 = −1.

On the other hand, since the transmission bit of “00” is associated with the difference frame length / reference value = ± 1 as shown in FIG. 19, the PSDU size x of x ₁ = 32, x ₂ = 16 and x ₃ = 32 bytes is set. A transmission bit of “00” can be transmitted according to the difference frame length / reference value of the three radio frames.

Further, the transmission bit “10” transmitted second is represented by (y ₄ −y ₃ ) / (y ₃ −y ₂ ) = (X ₄ −X ₃ ) / (X ₃ −X ₂ ). using the values of _{X 2, X 3, X 4} , (X 4 -X 3) / the _(X 3 -X ₂₎ calculating _{a, (X 4 -X 3) /} (X 3 -X 2) = (27-12) / (12-7) = 15/5 = 3.

On the other hand, since the transmission bit of “10” is associated with the difference frame length / reference value = ± 3 as shown in FIG. 19, the PSDU size x of x ₂ = 16, x ₃ = 32 and x ₄ = 78 bytes is set. The transmission bit of “10” can be transmitted according to the difference frame length / reference value of the three radio frames.

Further, the transmission bit “01” transmitted third is represented by (y ₅ −y ₄ ) / (y ₄ −y ₃ ) = (X ₅ −X ₄ ) / (X ₄ −X ₃ ). using the values of _{X 3, X 4, X 5} , when _(X 5 -X 4) to calculate a _{/ (X 4 -X 3),} (X 5 -X 4) / (X 4 -X 3) = (57-27) / (27-12) = 30/15 = 2.

On the other hand, since the transmission bit of “01” is associated with the difference frame length / reference value = ± 2 as shown in FIG. 19, the PSDU size x of x ₃ = 32, x ₄ = 78 and x ₅ = 168 bytes is used. A transmission bit of “01” can be transmitted according to the difference frame length / reference value of the three radio frames.

Further, since the transmission bit “11” transmitted last is represented by (y ₆ −y ₅ ) / (y ₅ −y ₄ ) = (X ₆ −X ₅ ) / (X ₅ −X ₄ ), When (X ₆ −X ₅ ) / (X ₅ −X ₄ ) is calculated using each value of X ₄ , X ₅ , and X ₆ , (X ₆ −X ₅ ) / (X ₅ −X ₄ ) = (177-57) / (57-27) = 120/30 = 4.

On the other hand, the transmission bit of “11” has a PSDU size of x ₄ = 78, x ₅ = 168 and x ₆ = 528 bytes because it is associated with the difference frame length / reference value = ± 4 as shown in FIG. The transmission bit of “11” can be transmitted by the difference frame length / reference value of the three radio frames.

FIG. 22 is a diagram illustrating another PSDU size of a plurality of radio frames when transmitting transmission bits according to the difference frame length / reference value. Note that X _{1 to} X ₆ shown in FIG. 22 are the values of ceiling ((22 + 8x) / 4α) when the transmission rate α is 9 Mbps.

When the transmission rate α is 9 Mbps, the frame lengths y ₁ , y ₂ , y ₃ , y ₄ , y ₅ , y ₆ are respectively y ₁ = ceiling ((22 + 8x ₁ ) / 36) × 4 + β, y ₂ = ceiling ((22 + 8x ₂ ) / 36) × 4 + β, y ₃ = ceiling ((22 + 8x ₃ ) / 36) × 4 + β, y ₄ = ceiling ((22 + 8x ₄ ) / 36) × 4 + β, y ₅ = ceiling ((22 + 8 × ₅₎ ) / 36) × 4 + β and y ₆ = ceiling ((22 + 8x ₆ ) / 36) × 4 + β.

When the transmission bit is represented by the difference frame length / reference value, as described above, since “4” and β of the ceiling ((22 + 8x) / 24) × 4 + β are erased, X ₁ = ceiling ((22 + 8x ₁ ) / 36), X ₂ = ceiling ((22 + 8x ₂ ) / 36), X ₃ = ceiling ((22 + 8x ₃ ) / 36), X ₄ = ceiling ((22 + 8x ₄ ) / 36), X ₅ = ceiling ((22 + 8x ₅ ) / 36) and X ₆ = ceiling ((22 + 8 × ₆ ) / 36).

Then, when X _{1 to} X ₆ are calculated using x ₁ = 32, x ₂ = 16, x ₃ = 32, x ₄ = 73, x ₅ = 154, and x ₆ = 478 Bytes, X ₁ = 8, X ₂ = 5, X ₃ = 8, X ₄ = 17, X ₅ = 35 and X ₆ = 107 (see FIG. 22).

Since the transmission bit “00” transmitted first is represented by (y ₃ −y ₂ ) / (y ₂ −y ₁ ) = (X ₃ −X ₂ ) / (X ₂ −X ₁ ), X ₁ using the values of _{X 2, X 3, (X} 3 -X 2) / the _(X 2 -X ₁₎ to calculate _{a, (X 3 -X 2) /} (X 2 -X 1) = (8 −5) / (5-8) = 3 / −3 = −1.

On the other hand, since the transmission bit of “00” is associated with the difference frame length / reference value = ± 1 as shown in FIG. 19, even when the transmission rate α of 9 Mbps is used, x ₁ = 32, x ₂ = 16 And a transmission bit of “00” can be transmitted by the difference frame length / reference value of three radio frames having a PSDU size x of x ₃ = 32 bytes.

Further, the transmission bit “10” transmitted second is represented by (y ₄ −y ₃ ) / (y ₃ −y ₂ ) = (X ₄ −X ₃ ) / (X ₃ −X ₂ ). using the values of _{X 2, X 3, X 4} , (X 4 -X 3) / the _(X 3 -X ₂₎ calculating _{a, (X 4 -X 3) /} (X 3 -X 2) = (17-8) / (8-5) = 9/3 = 3.

On the other hand, since the transmission bit of “10” is associated with the difference frame length / reference value = ± 3 as shown in FIG. 19, even when the transmission rate α of 9 Mbps is used, x ₂ = 16, x ₃ = 32 And a transmission bit of “10” can be transmitted by the differential frame length / reference value of three radio frames having a PSDU size x of x ₄ = 73 bytes.

Further, the transmission bit “01” transmitted third is represented by (y ₅ −y ₄ ) / (y ₄ −y ₃ ) = (X ₅ −X ₄ ) / (X ₄ −X ₃ ). using the values of _{X 3, X 4, X 5} , when _(X 5 -X 4) to calculate a _{/ (X 4 -X 3),} (X 5 -X 4) / (X 4 -X 3) = (35-17) / (17-8) = 18/9 = 2.

On the other hand, since the transmission bit of “01” is associated with the difference frame length / reference value = ± 2 as shown in FIG. 19, even when the transmission rate α of 9 Mbps is used, x ₃ = 32 and x ₄ = 73. And a transmission bit of “01” can be transmitted by the difference frame length / reference value of three radio frames having a PSDU size x of x ₅ = 154 bytes.

Further, since the transmission bit “11” transmitted last is represented by (y ₆ −y ₅ ) / (y ₅ −y ₄ ) = (X ₆ −X ₅ ) / (X ₅ −X ₄ ), When (X ₆ −X ₅ ) / (X ₅ −X ₄ ) is calculated using each value of X ₄ , X ₅ , and X ₆ , (X ₆ −X ₅ ) / (X ₅ −X ₄ ) = (107−35) / (35−17) = 72/18 = 4.

On the other hand, since the transmission bit of “11” is associated with the difference frame length / reference value = ± 4 as shown in FIG. 19, even when the transmission rate α of 9 Mbps is used, x ₄ = 73, x ₅ = 154 And the transmission bit of “11” can be transmitted by the differential frame length / reference value of three radio frames having a PSDU size x of x ₆ = 478 bytes.

  Similarly, when the transmission rate α is any one of 12, 18, 24, 48, and 54 Mbps, similarly, by sequentially transmitting six radio frames having six PSDU sizes x, a difference frame length / reference Using the values, transmission bits of “00”, “11”, “10”, “01” can be transmitted.

  In this way, by sequentially transmitting six radio frames having the six PSDU sizes calculated as described above, using the difference frame length / reference value, “00”, “11”, “10”, Transmission bits of “01” can be transmitted sequentially.

  Also, the transmission bits “00”, “01”, “10”, “11” are represented by the difference frame length / reference value and transmitted in the order of “00”, “11”, “10”, “01”. When the difference frame length / reference value is calculated using the frame lengths of three consecutive radio frames, the values are ± 0 corresponding to “00”, “11”, “10”, “01”, respectively. Six PSDU sizes may be calculated so as to be ± 4, ± 3, and ± 2 (see FIG. 19), and six radio frames having the calculated six PSDU sizes may be transmitted sequentially.

  According to such a method, transmission bits “00”, “01”, “10”, and “11” can be transmitted in an arbitrary order using the difference frame length / reference value of three adjacent radio frames.

  When four radio frames FR1 to FR4 are transmitted, the control identifier CID is represented by two differential frame lengths / reference values, and one differential frame length / reference value is associated with 2 bits. . Further, the number of bits of the control identifier CID is 2 bits or more. Therefore, when the item f is used, the wireless device 1 sequentially broadcasts (K / 2) +2 wireless frames to the receiver 2. Here, when j = (K / 2) +2, j is an integer of 3 or more.

  As described above, since the number of bits of the control identifier CID only needs to be 2 bits or more, the wireless device 1 broadcasts 3 or more wireless frames when the control identifier CID is represented by the difference frame length / reference value. That's fine. In this case, the control identifier CID is represented by one or more differential frame lengths / reference values.

  When the item f is used, the frame length detection circuit 25 of the receivers 2 to 4 holds the correspondence table TBL4 shown in FIG. 18 in advance, and the frame length determination circuit 26 of the receivers 2 to 4 The correspondence table TBL5 or the correspondence table TBL6 shown is held in advance.

  The frame length detection circuit 25 of the receivers 2 to 4 detects a plurality of accumulated values corresponding to a plurality of radio frames by the above-described method, and refers to the correspondence table TBL4 to detect the plurality of accumulated values. The frame length is converted, and the plurality of converted frame lengths are output to the frame length determination circuit 26.

  The frame length determination circuit 26 calculates one or a plurality of difference frame lengths / reference values based on the plurality of frame lengths received from the frame length detection circuit 25, and refers to the correspondence table TBL5 to calculate the difference. Each of the one or more differential frame lengths / reference values is converted into transmission bits to obtain a bit string. Then, when the acquired bit string matches the control identifier CID of the controlled units 5 to 7, the frame length determination circuit 26 generates a control signal based on the control identifier CID, and uses the generated control signal as the controlled unit. Send to 5-7.

  Thereby, even when the control identifier CID is represented by the difference frame length / reference value, the controlled units 5 to 7 can be controlled.

  As described above, when the correspondence table TBL5 is used, the frame length determination circuit 26 divides each difference frame length by the reference value to convert each difference frame length into two transmission bits.

  In the above, the transmission bits of “00”, “01”, “10”, and “11” are associated with the difference frame length / reference value of ± 1, ± 2, ± 3, and ± 4, respectively. However, in the first embodiment of the present invention, the transmission bits of “00”, “01”, “10”, “11” are ± 2, ± 4. , ± 6, ± 8 difference frame length / reference value, or ± 1, ± 3, ± 5, ± 7 difference frame length / reference value. Is the difference frame length / reference of ± 1, ± (1 + q), ± (1 + 2q), ± (1 + 3q) or ± 2, ± (2 + q), ± (2 + 2q), ± (2 + 3q) (q = odd or even) It only needs to be associated with the value.

  When the control identifier CID is represented by the difference frame length / reference value, the frame length determination circuit 26 may acquire a bit string based on a plurality of frame lengths using the correspondence table TBL6. This will be described in more detail. When two transmission bits are transmitted by representing the difference frame length / reference value, three radio frames FR1 to FR3 are sequentially transmitted. Radio frames FR1 to FR3 have frame lengths L1 to L3, respectively.

  The frame length determination circuit 26 calculates a plurality of difference frame lengths (L2−L1) and (L3−L2) based on the plurality of frame lengths L1 to L3 received from the frame length detection circuit 25, and calculates a difference frame length (L2 -L1) is used as a reference value. The frame length determination circuit 26 is ± 1 × reference value (= (L2−L1)), ± 2 × reference value (= (L2−L1)), ± 3 × reference value (= (L2−L1)). And ± 4 × reference value (= (L2−L1)) is calculated.

Then, the frame length determination circuit 26 sets the difference frame length (L3−L2) to ± 1 × reference value (= (L2−L1)), ± 2 × reference value (= (L2−L1)), ± 3 × reference. Value (= (L2
-L1)) and ± 4 × reference value (= (L2-L1)). If the difference frame length (L3−L2) matches ± 1 × reference value (= (L2−L1)), the frame length determination circuit 26 transmits the difference frame length (L3−L2) of “00”. If the difference frame length (L3−L2) matches ± 2 × reference value (= (L2−L1)), the difference frame length (L3−L2) is converted into a transmission bit of “01”. If the difference frame length (L3−L2) matches ± 3 × reference value (= (L2−L1)), the difference frame length (L3−L2) is converted into a transmission bit of “10”, and the difference frame length If (L3−L2) matches ± 4 × reference value (= (L2−L1)), the difference frame length (L3−L2) is converted into a transmission bit of “11”.

  As described above, when the correspondence table TBL6 is used, the frame length determination circuit 26 calculates the difference frame length by multiplying ± 1, ± 2, ± 3, ± 4 and the reference value by 2 bits. Convert to

  In the above, the transmission bits of “00”, “01”, “10”, “11” are ± 1 × (reference value), ± 2 × (reference value), ± 3 × (reference value, respectively). ), ± 4 × (reference value) corresponding to the difference frame length (see FIG. 20). However, in the first embodiment, not limited to this, “00”, “01”, “10” , “11” transmission bits may be associated with differential frame lengths of ± 2 × (reference value), ± 4 × (reference value), ± 6 × (reference value), ± 8 × (reference value). It may be associated with a difference frame length of ± 1 × (reference value), ± 3 × (reference value), ± 5 × (reference value), ± 7 × (reference value). ± 1 × (reference value), ± (1 + q) × (reference value), ± (1 + 2q) × (reference value), ± (1 + 3q) × (reference value) or ± 2 × (reference value), ± (2 + q) × (reference value), ± 2 + 2q) × (reference value), ± (2 + 3q) × (or if associated with a reference value) (q = odd or even) difference frame length × (reference value).

  As described above, when the control identifier CID is represented by the difference frame length / reference value, the frame length determination circuit 26 calculates the difference frame length by the reference value, or ± 1, ± (1 + q), ± (1 + 2q ), ± (1 + 3q) and the reference value, or ± 2, ± (2 + q), ± (2 + 2q), ± (2 + 3q) and the reference value are used to set each differential frame length to 2 transmission bits. Convert to

  FIG. 23 is a schematic diagram illustrating another configuration of the receiver 2 illustrated in FIG. 3. The wireless communication system 10 according to the first embodiment may include a receiver 2A illustrated in FIG.

  Referring to FIG. 23, receiver 2A is the same as receiver 2 except that envelope detection circuit 23 of receiver 2 shown in FIG.

  The synchronous detection circuit 27 receives a reception signal of a radio signal from the unnecessary wave removal circuit 22 and synchronously detects the received signal. Then, the synchronous detection circuit 27 outputs the result of the synchronous detection to the bit determination unit 24.

  FIG. 24 is a schematic diagram showing the configuration of the synchronous detection circuit 27 shown in FIG. Referring to FIG. 24, synchronous detection circuit 27 includes a multiplier 271, a carrier recovery circuit 272, and an LPF 273.

  Multiplier 271 receives a radio signal reception signal from unnecessary wave removal circuit 22 and a carrier wave from carrier wave recovery circuit 272. Then, the multiplier 271 multiplies the reception signal of the radio signal by the carrier wave and outputs the multiplication result to the LPF 273.

The carrier wave reproduction circuit 272 receives a radio signal reception signal from the unnecessary wave removal circuit 22 and reproduces a 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 272 outputs the recovered carrier to the multiplier 271.

  The LPF 273 receives the multiplication result from the multiplier 271, removes the high frequency component of the received multiplication result, and outputs the low frequency component of the multiplication result to the bit decision unit 24 as the detection result.

  In the receiver 2A, the bit determination unit 24 samples the detection signal from the synchronous detection circuit 27 at a sampling period and converts it into a digital signal sequence.

  In this manner, the receiver 2A converts the received signal into a digital signal sequence by synchronously detecting the received signal of the radio signal.

  The wireless communication system 10 according to the first embodiment may include a receiver in which the envelope detection circuit 23 of the receiver 2 shown in FIG. 3 is replaced with a regenerative detection circuit.

  The regenerative detection circuit receives a radio signal reception signal from the unnecessary wave removal circuit 22 and detects the received radio signal reception signal by regenerative detection (Non-patent Document 3). Then, the reproduction detection circuit outputs the detection result to the bit determination unit 24.

  As described above, the wireless communication system 10 according to the first embodiment 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. 25 is a schematic diagram showing still another configuration of the receiver 2 shown in FIG. The wireless communication system 10 according to Embodiment 1 may include a receiver 2B illustrated in FIG.

  Referring to FIG. 25, receiver 2B is the same as receiver 2 except that frame length detection circuit 25 of receiver 2 shown in FIG. 3 is replaced with frame length detection circuit 25A.

  The frame length detection circuit 25A receives a bit string from the bit decision unit 24. Then, the frame length detection circuit 25A detects the time length from the rising edge to the falling edge of the received bit string as the frame length. That is, in the bit string, the frame length detection circuit 25A detects the time length from the timing when the bit value changes from “0” to “1” to the timing when the bit value changes from “1” to “0” as the frame length. To do. Then, the frame length detection circuit 25A outputs the detected frame length to the frame length determination circuit 26.

  The wireless communication system 10 according to the first embodiment may include a receiver in which the envelope detection circuit 23 of the receiver 2B illustrated in FIG. 25 is replaced with a synchronous detection circuit 27 or a regenerative detection circuit.

  The receiver 2 counts the accumulated value of the number “1” in the bit string, and multiplies the counted accumulated value by the bit determination period to detect the frame length. In the bit string, the receiver 2B detects the time length from the timing when the bit value changes from “0” to “1” to the timing when the bit value changes from “1” to “0” as the frame length.

  Therefore, the receiver according to the embodiment of the present invention only needs to detect the frame length based on the bit string.

  FIG. 26 is a flowchart for explaining the operation of the wireless communication system 10 shown in FIG. In FIG. 26, the operation of the wireless communication system 10 will be described by taking the case of controlling the controlled unit 5 as an example. FIG. 26 is a flowchart for explaining the operation of the wireless communication system 10 when the items A1, B1, C1, and D1 shown in FIG. 12 are used at the same time. Further, in FIG. 26, the operation of the wireless communication system 10 will be described on the assumption that the wireless device 1 is in the infrastructure mode.

  Referring to FIG. 26, when a series of operations is started, the host system 13 of the wireless device 1 determines whether or not to start control of the control target device (step S1). When the host system 13 determines to start control of the control target device, the host system 13 further determines whether or not the mode is the autonomous transmission mode (step S2).

  When it is determined in step S2 that the mode is not the autonomous transmission mode, the host system 13 of the wireless device 1 determines whether the wireless device 1 has already established a wireless link with another wireless device by the method described above. Further determination is made (step S3).

  In step S3, if the host system 13 belongs to the access point, the host system 13 determines that a wireless link has been established with another wireless device, and if a wireless link has been established with a wireless device other than the access point, It is determined that a wireless link has been established with another wireless device. In step S3, if the host system 13 does not belong to the access point, the host system 13 determines that the wireless link has not been established with the wireless device. If the wireless link has not been established with a wireless device other than the access point, the host system 13 It is determined that a wireless link has not been established with the wireless device.

  In step S3, when it is determined that the wireless device 1 has already established a wireless link with another wireless device, the series of operations proceeds to step S5.

  On the other hand, when it is determined in step S3 that the wireless device 1 has not established a wireless link with another wireless device, the host system 13 generates an instruction signal Comd2 and outputs it to the frame length modulation signal generator 12.

  The frame length modulation signal generation unit 12 shifts from the infrastructure mode to the autonomous transmission mode in response to the instruction signal Comd2 from the host system 13 (step S4).

  Then, when it is determined in step S2 that the mode is the autonomous transmission mode, or when it is determined in step S3 that the wireless device 1 has already established a wireless link with another wireless device, or after step S4 The host system 13 outputs the frame length representing the control identifier CID of the controlled unit 5 to be controlled and the desired communication method to the frame length modulation signal generation unit 12, and the frame length modulation signal generation unit 12 The wireless frame having the frame length received from 13 is transmitted to the receiver R by the desired communication method received from the host system 13 (step S5). That is, the frame length modulation signal generation unit 12 transmits a radio frame to the receiver R by a communication method in which the modulation method, the frame format, the encryption method, and the frame type are fixed.

  When it is determined in step S2 that the mode is the autonomous transmission mode, the series of operations proceeds to step S5. The autonomous transmission mode is that the wireless device 1 establishes a wireless link with another wireless device. This is because the wireless device 1 is in a mode for autonomously transmitting a wireless frame when not.

In the receiver 2, the unnecessary wave removal circuit 22 receives a radio wave via the antenna 21, removes the unnecessary wave from the received reception radio wave, and extracts a signal having a radio frame frequency. Thereby, the receiver 2 receives the radio frame (step S6). Then, the unnecessary wave removal circuit 22 outputs the extracted signal to the envelope detection circuit 23.

  The envelope detection circuit 23 performs envelope detection on the signal received from the unnecessary wave removal circuit 22 at regular intervals (step S7), and outputs the detected detection signal to the bit decision unit 24.

  The bit determination unit 24 converts the detection signal received from the envelope detection circuit 23 into a bit value of “0” or “1” and performs bit determination on the envelope (step S8). Then, the bit determination unit 24 outputs the converted bit string to the frame length detection circuit 25.

  The frame length detection circuit 25 accumulates the number of bit values of “1” in the bit string received from the bit decision unit 24. When the bit value of “0” is input, the accumulation of “1” is stopped. Is calculated as a cumulative value of “1” (step S9). Then, the frame length detection circuit 25 outputs the accumulated value to the frame length determination circuit 26. The frame length determination circuit 26 refers to the conversion table TBL2 and converts the accumulated value received from the frame length detection circuit 25 into a bit string (step S10).

  When the cumulative value is converted into a bit string, the frame length determination circuit 26 determines whether or not the bit string matches the control identifier CID of the controlled unit 5 (step S11).

  In step S <b> 11, when it is determined that the bit string matches the control identifier CID, the frame length determination circuit 26 generates a control signal and outputs it to the controlled unit 5. That is, the frame length determination circuit 26 controls the controlled unit 5 based on the control identifier D (step S12).

  In step S12, the frame length determination circuit 26 of the receiver 2 adjusts the control content for turning on the controlled unit 5, the control content for turning off the controlled unit 5, and the light intensity of the controlled unit 5 (illumination). A control signal including any of the control content and the control content for adjusting the volume of the controlled unit 5 (speaker) is generated, and the generated control signal is output to the controlled unit 5. As a result, the controlled unit 5 is turned on or off, the light intensity is adjusted, or the volume is adjusted.

  Then, when it is determined in step S11 that the bit string does not match the control identifier CID, or after step S12, the series of operations ends.

  As described above, according to the flowchart shown in FIG. 26, when the wireless device 1 has not established a wireless link with another wireless device in the infrastructure mode, the wireless device 1 shifts to the autonomous transmission mode and controls the controlled unit 5. A radio frame having a frame length representing the identifier CID is transmitted to the receiver 2 (see step S1 to step S5).

  Therefore, even when the wireless device 1 cannot transmit a wireless frame, the wireless device 1 can transmit a wireless frame having a frame length representing the control identifier CID of the controlled unit 5 to be controlled.

  In addition, since the wireless device 1 transmits a wireless frame having a frame length representing the control identifier CID using a fixed communication method (see step S5), the frame length of the wireless frame does not vary. As a result, the receiver 2 can receive a wireless frame having a waiting frame length and can accurately control the controlled unit 5.

FIG. 27 is another flowchart for explaining the operation of the wireless communication system 10 shown in FIG. Note that, also in FIG. 27, the operation of the wireless communication system 10 will be described by taking the case of controlling the controlled unit 5 as an example. 27 is a flowchart for explaining the operation of the wireless communication system 10 when the items A2, B2, C2, and D2 shown in FIG. 12 are used at the same time. Further, also in FIG. 27, the operation of the wireless communication system 10 will be described on the assumption that the wireless device 1 is in the infrastructure mode.

  The flowchart shown in FIG. 27 is the same as the flowchart shown in FIG. 26 except that steps S5 to S11 in the flowchart shown in FIG. 26 are replaced with steps S5A to S11A, respectively.

  Referring to FIG. 27, when a series of operations is started, steps S1 to S4 described above are sequentially executed.

  Then, when it is determined in step S2 that the mode is the autonomous transmission mode, or when it is determined in step S3 that the wireless device 1 has already established a wireless link with another wireless device, or after step S4 The radio apparatus 1 transmits a radio frame having a frame length representing the control identifier CID of the controlled unit 5 to the receiver 2 by a round-robin scheme of communication parameters (modulation scheme, frame format, encryption scheme and frame type). (Step S5A). That is, the wireless device 1 receives a wireless frame having a frame length representing the control identifier CID in 224 communication methods using all modulation methods, all frame formats, all encryption methods, and all frame types. 2 to send.

  In the receiver 2, the unwanted wave removal circuit 22 receives radio waves via the antenna 21, removes unwanted waves from the received received radio waves, and extracts signals having a plurality of radio frame frequencies. Thereby, the receiver 2 sequentially receives a plurality of radio frames (step S6A). Then, the unnecessary wave removal circuit 22 outputs the extracted signal to the envelope detection circuit 23.

  The envelope detection circuit 23 sequentially detects the plurality of signals received from the unnecessary wave removal circuit 22 at regular intervals (step S7A), and outputs the detected plurality of detection signals to the bit determination unit 24. .

  The bit determination unit 24 converts each of the plurality of detection signals received from the envelope detection circuit 23 into a bit value of “0” or “1”, and sequentially determines a plurality of envelopes (step S8A). . Then, the bit determination unit 24 outputs the plurality of converted bit strings to the frame length detection circuit 25.

  The frame length detection circuit 25 accumulates the number of bit values of “1” in each of the plurality of bit strings received from the bit decision unit 24, and when the bit value of “0” is input, accumulates “1”. Stop and calculate the accumulated value at that time as the accumulated value of “1” to detect a plurality of accumulated values (step S9A). Then, the frame length detection circuit 25 outputs a plurality of accumulated values to the frame length determination circuit 26. The frame length determination circuit 26 refers to the conversion table TBL2 and converts the plurality of accumulated values received from the frame length detection circuit 25 into a plurality of bit strings (step S10A).

  When the plurality of cumulative values are converted into a plurality of bit strings, the frame length determination circuit 26 determines whether any of the plurality of bit strings matches the control identifier CID of the controlled unit 5 (step S11A).

In step S <b> 11 </ b> A, when it is determined that any of the plurality of bit strings matches the control identifier CID, the frame length determination circuit 26 generates a control signal based on the control identifier D and outputs the control signal to the controlled unit 5. That is, the frame length determination circuit 26 controls the controlled unit 5 based on the control identifier D (step S12).

  In step S11A, when it is determined that none of the plurality of bit strings matches the control identifier CID, or after step S12, the series of operations ends.

  As described above, according to the flowchart shown in FIG. 27, when the wireless device 1 has not established a wireless link with another wireless device in the infrastructure mode, the wireless device 1 shifts to the autonomous transmission mode and controls the controlled unit 5. A radio frame having a frame length representing the identifier CID is transmitted to the receiver 2 (see Steps S1 to S4 and S5A).

  Therefore, even when the wireless device 1 cannot transmit a wireless frame, the wireless device 1 can transmit a wireless frame having a frame length representing the control identifier CID of the controlled unit 5 to be controlled.

  The wireless device 1 also receives a wireless frame having a frame length representing a control identifier CID in 224 communication methods using all modulation methods, all frame formats, all encryption methods, and all frame types. 2 (see step S5A), even if the frame length varies depending on the communication method, one of the plurality of bit strings matches the control identifier CID of the controlled unit 5. Accordingly, the controlled unit 5 can be accurately controlled even if the frame length varies depending on the communication method.

  FIG. 28 is still another flowchart for explaining the operation of the wireless communication system 10 shown in FIG. Note that, also in FIG. 28, the operation of the wireless communication system 10 will be described by taking the case of controlling the controlled unit 5 as an example. Further, the flowchart shown in FIG. 28 is a flowchart for explaining the operation of the wireless communication system 10 when the items a and e shown in FIG. 12 are used at the same time. Further, also in FIG. 28, the operation of the wireless communication system 10 will be described on the assumption that the wireless device 1 is in the infrastructure mode.

  In the flowchart shown in FIG. 28, steps S5A, S9A, and S10A in the flowchart shown in FIG. 27 are replaced with steps S5B, S9B, and S10B, respectively, and step S11A is replaced with step S11. Is the same.

  Referring to FIG. 28, when a series of operations is started, steps S1 to S4 described above are sequentially executed.

  Then, when it is determined in step S2 that the mode is the autonomous transmission mode, or when it is determined in step S3 that the wireless device 1 has already established a wireless link with another wireless device, or after step S4 The wireless device 1 transmits a plurality of wireless frames so that the control identifier CID of the controlled unit 5 is represented by the difference frame length (step S5B).

  Thereafter, step S6A to step S8A described above are sequentially executed.

  After step S8A, the frame length detection circuit 25 of the receiver 2 accumulates the number of bit values “1” in each of the plurality of bit strings received from the bit determiner 24, and the bit value “0” is input. Then, the accumulation of “1” is stopped, the accumulated value at that time is calculated as the accumulated value of “1”, and a plurality of accumulated values are detected. Then, the frame length detection circuit 25 refers to the correspondence table TBL4, converts the detected plurality of accumulated values into a plurality of frame lengths, and outputs the converted plurality of frame lengths to the frame length determination circuit 26 ( Step S9B).

  Thereafter, the frame length determination circuit 26 calculates one or more difference frame lengths based on the plurality of frame lengths from the frame length detection circuit 25, and refers to the correspondence table TBL3 to determine one or more differences. The frame length is converted into a bit string (step S10B).

  And step S11, S12 mentioned above is performed sequentially, and a series of operation | movement is complete | finished.

  As described above, according to the flowchart shown in FIG. 28, when the wireless device 1 has not established a wireless link with another wireless device in the infrastructure mode, the wireless device 1 shifts to the autonomous transmission mode and controls the controlled unit 5. A plurality of radio frames are transmitted to the receiver 2 so that the identifier CID is represented by the difference frame length (see steps S1 to S4 and S5B).

  Therefore, even when the radio apparatus 1 cannot transmit a radio frame, the radio apparatus 1 can transmit a plurality of radio frames so that the control identifier CID of the controlled unit 5 to be controlled is represented by the difference frame length.

  Further, since the wireless device 1 transmits the control identifier CID represented by the difference frame length, the receiver 2 absorbs the variation of the frame length y due to the length β of the physical header and the PSDU size x, and one or more The difference frame length is received. Therefore, even if the wireless device 1 transmits a wireless frame without controlling the frame format, encryption method, and frame type, the receiver 2 can accurately receive the control identifier CID. As a result, the controlled unit 5 can be accurately controlled.

  FIG. 29 is still another flowchart for explaining the operation of the wireless communication system 10 shown in FIG. Note that, also in FIG. 29, the operation of the wireless communication system 10 will be described by taking the case of controlling the controlled unit 5 as an example. Further, the flowchart shown in FIG. 29 is a flowchart for explaining the operation of the wireless communication system 10 when the item f shown in FIG. 12 is used. Further, also in FIG. 29, the operation of the wireless communication system 10 will be described on the assumption that the wireless device 1 is in the infrastructure mode.

  The flowchart shown in FIG. 29 is the same as the flowchart shown in FIG. 28 except that steps S5B and S10B in the flowchart shown in FIG. 28 are replaced with steps S5C and S10C, respectively.

  Referring to FIG. 29, when a series of operations is started, steps S1 to S4 described above are sequentially executed.

  Then, when it is determined in step S2 that the mode is the autonomous transmission mode, or when it is determined in step S3 that the wireless device 1 has already established a wireless link with another wireless device, or after step S4 The radio apparatus 1 transmits a plurality of radio frames so that the control identifier CID of the controlled unit 5 is represented by the difference frame length / reference value (step S5C).

  Thereafter, the above-described steps S6A to S8A, S9B are sequentially executed.

  After step S9B, the frame length determination circuit 26 calculates one or a plurality of difference frame lengths / reference values based on the plurality of frame lengths from the frame length detection circuit 25, and refers to the correspondence table TBL5. One or more differential frame lengths / reference values are converted into bit strings (step S10C).

  And step S11, S12 mentioned above is performed sequentially, and a series of operation | movement is complete | finished.

  As described above, according to the flowchart shown in FIG. 29, when the wireless device 1 has not established a wireless link with another wireless device in the infrastructure mode, the wireless device 1 shifts to the autonomous transmission mode and controls the controlled unit 5. A plurality of radio frames are transmitted to the receiver 2 so that the identifier CID is represented by the difference frame length / reference value (see steps S1 to S4 and S5C).

  Therefore, even when the radio apparatus 1 cannot transmit a radio frame, the radio apparatus 1 can transmit a plurality of radio frames so that the control identifier CID of the controlled unit 5 to be controlled is represented by the difference frame length / reference value.

  Further, since the wireless device 1 transmits the control identifier CID by representing the difference frame length / reference value, the receiver 2 transmits the frame length based on the modulation scheme (transmission rate) α, the physical header length β, and the PSDU size x. One or more differential frame lengths / reference values are received by absorbing variations in y. Therefore, even if the wireless device 1 transmits a wireless frame without controlling the modulation method, frame format, encryption method, and frame type, the receiver 2 can accurately receive the control identifier CID. As a result, the controlled unit 5 can be accurately controlled.

  FIG. 30 is still another flowchart for explaining the operation of the wireless communication system 10 shown in FIG. In addition, also in FIG. 30, operation | movement of the radio | wireless communications system 10 is demonstrated by taking the case where the to-be-controlled part 5 is controlled as an example. 30 is a flowchart for explaining the operation of the wireless communication system 10 when the items a, b, c, and d shown in FIG. 12 are used at the same time. Further, also in FIG. 30, the operation of the wireless communication system 10 will be described on the assumption that the wireless device 1 is in the infrastructure mode.

  In the flowchart shown in FIG. 30, step S5 of the flowchart shown in FIG. 26 is replaced with step S5D, and steps S20 and S21 are added between step S9 and step S10. The others are the flowchart shown in FIG. The same.

  Referring to FIG. 30, when a series of operations is started, the above-described steps S1 to S4 are sequentially executed.

  Then, when it is determined in step S2 that the mode is the autonomous transmission mode, or when it is determined in step S3 that the wireless device 1 has already established a wireless link with another wireless device, or after step S4 The wireless device 1 transmits a wireless frame having a frame length representing the control identifier CID of the controlled unit 5 without controlling the communication parameter (step S5D).

  Thereafter, the above-described steps S6 to S9 are sequentially executed. After step S9, the frame length determination circuit 26 of the receiver 2 receives the accumulated value from the frame length detection circuit 25, and determines whether or not the received accumulated value matches the waiting accumulated value. (Step S20). In this case, as described above, the frame length determination circuit 26 of the receivers 2 to 4 calculates a plurality of cumulative values obtained when a radio frame having a predetermined number of bytes is transmitted using all communication methods. Since it is held as a waiting accumulated value, it is determined whether or not the calculated accumulated value matches any of a plurality of accumulated values. The frame length determination circuit 26 of the receivers 2 to 4 determines that the calculated accumulated value matches the waiting accumulated value if the calculated accumulated value matches any of the plurality of accumulated values. If the accumulated value does not match any of the plurality of accumulated values, it is determined that the calculated accumulated value does not match the waiting accumulated value.

  When it is determined in step S20 that the accumulated value does not match the waiting accumulated value, the series of operations ends.

  On the other hand, when it is determined in step S20 that the accumulated value matches the waiting accumulated value, the frame length determination circuit 26 of the receivers 2 to 4 determines that the waiting accumulated value has been received (step S21). . Thereafter, the above-described steps S10 to S12 are sequentially executed, and a series of operations is completed.

  In the flowcharts shown in FIGS. 26 to 30, the operation of the wireless communication system 10 in the case of controlling the controlled unit 5 has been described. However, the first embodiment of the present invention is not limited to this and is not controlled. Even when the units 6 and 7 are controlled, the operation of the wireless communication system 10 is executed according to the flowcharts shown in FIGS.

  Also, Steps S1 to S5 shown in FIG. 26, Steps S1 to S4 and S5A shown in FIG. 27, Steps S1 to S4 and S5B shown in FIG. 28, Steps S1 to S4 and S5C shown in FIG. Each of steps S1 to S4 and S5D shown in FIG. 30 constitutes a program that causes a computer to execute transmission of a radio frame in the radio apparatus according to the first embodiment of the present invention.

  Furthermore, steps S6 to S12 shown in FIG. 26, steps S6A to S11A and S12 shown in FIG. 27, steps S6A, 7A, S8A, S9B, S10B, S11 and S12 shown in FIG. 28, and steps S6A and S7A shown in FIG. , S8A, S9B, S10C, S11, S12 and steps S6 to S9, S20, S21, S10 to S12 shown in FIG. 30 are performed for reception of a radio frame transmitted by the radio apparatus according to the first embodiment of the present invention. Configure a program to be executed by a computer.

  In this case, the wireless device 1 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory). The program A includes steps S1 to S5 shown in FIG. 26, and the steps shown in FIG. Program B consisting of S1 to Steps S4 and S5A, Program C consisting of Steps S1 to S4 and S5B shown in FIG. 28, Program D consisting of Steps S1 to S4 and S5C shown in FIG. 29, and Step S1 shown in FIG. Any one of the programs E composed of steps S4 and S5D is stored in the ROM.

  And when CPU of the radio | wireless apparatus 1 controls the to-be-controlled parts 5-7, any one of the program A-program E is read from ROM, and is performed, and the control identifier of the to-be-controlled parts 5-7 is performed by the method mentioned above. Broadcast CID to receivers 2-4.

In this case, the conversion table TBL1 and the correspondence tables TBL3, TBL5, and TBL6 are stored in the ROM, and the CPU of the wireless device 1 reads the conversion table TBL1 from the ROM and refers to the read conversion table TBL1 to be controlled. The control identifier CID of the units 5 to 7 is converted into a frame length. Further, the CPU of the wireless device 1 reads the correspondence table TBL3 from the ROM, refers to the read correspondence table TBL3, determines a plurality of frame lengths so that the control identifier CID is represented by the difference frame length, and determines A plurality of radio frames having a plurality of frame lengths are transmitted to the receivers 2 to 4. Further, the CPU of the wireless device 1 reads the correspondence table TBL5 or the correspondence table TBL6 from the ROM, and refers to the read correspondence table TBL5 or the correspondence table TBL6 so that the control identifier CID is represented by the difference frame length / reference value. A plurality of frame lengths are determined, and a plurality of radio frames having the determined plurality of frame lengths are transmitted to the receivers 2 to 4. Then, the CPU of the wireless device 1 uses the RAM to calculate the payload size (that is, PSDU size x) using Equation (1) or Equation (2) so that the determined frame length is obtained.

  When the CPU of the wireless device 1 executes the program A, the CPU that executes Steps S1 to S4 constitutes “control means”, and the CPU that executes Step S5 constitutes “transmission means”.

  When the CPU of the wireless device 1 executes the program B, the CPU that executes Steps S1 to S4 constitutes “control means”, and the CPU that executes Step S5A constitutes “transmission means”.

  Further, when the CPU of the wireless device 1 executes the program C, the CPU that executes Steps S1 to S4 constitutes “control means”, and the CPU that executes Step S5B constitutes “transmission means”.

  Further, when the CPU of the wireless device 1 executes the program D, the CPU that executes Steps S1 to S4 constitutes “control means”, and the CPU that executes Step S5C constitutes “transmission means”.

  Each of the receivers 2 to 4 includes a CPU, a ROM, and a RAM. The program F includes steps S6 to S12 illustrated in FIG. 26, the program G includes steps S6A to S11A and S12 illustrated in FIG. Program S consisting of steps S6A, 7A, S8A, S9B, S10B, S11, S12 shown in FIG. 29, program I consisting of steps S6A, S7A, S8A, S9B, S10C, S11, S12 shown in FIG. 29 and step S6 shown in FIG. Any one of the programs J consisting of S9, S20, S21, and S10 to S12 is stored in the ROM.

  Then, when receiving the wireless frame transmitted from the wireless device 1, the CPUs of the receivers 2 to 4 read and execute any one of the programs F to J from the ROM, and perform the wireless device 1 by the method described above. When the radio frame transmitted from is received and the frame length of the received radio frame represents the control identifier CID of the controlled units 5 to 7, the controlled units 5 to 7 are controlled based on the control identifier CID, respectively.

  In this case, the conversion table TBL2 and the correspondence tables TBL3 to TBL6 are stored in the ROM, and the CPUs of the receivers 2 to 4 read the conversion table TBL2 from the ROM and perform an operation with reference to the read conversion table TBL2. The accumulated value is converted into a bit string.

  Further, the CPUs of the receivers 2 to 4 read the correspondence table TBL4 from the ROM, refer to the read correspondence table TBL4, convert the calculated cumulative value into a frame length, and based on the converted frame length, The difference frame length or the difference frame length / reference value is calculated using the RAM. The CPUs of the receivers 2 to 4 read the correspondence table TBL3 from the ROM, and refer to the read correspondence table TBL3 to convert the calculated difference frame length into a bit string. The CPUs of the receivers 2 to 4 read the correspondence table TBL5 or the correspondence table TBL6 from the ROM and refer to the read correspondence table TBL5 or the correspondence table TBL6 to convert the calculated difference frame length / reference value into a bit string. To do.

  When the CPUs of the receivers 2 to 4 execute the program J, the CPU that executes step S6 constitutes “reception means”, and the CPU that executes step S7 constitutes “detection means” and executes step S8. The CPU to be executed constitutes “conversion means”, the CPU to execute step S9 constitutes “calculation means”, and the CPU to execute steps S20 and S21 constitutes “determination means”.

  26 to 30, the operation of the wireless communication system 10 has been described using the processing operation in the receiver 2. However, in the case where the receiver 2A is used instead of the receiver 2 in FIGS. In step S7 in FIG. 30 and step S7A in FIG. 27 to FIG. 29, the receiver 2A performs synchronous detection or regenerative detection on the received signal of the radio frame, and in steps S8 in FIG. 26 and FIG. In step S8A of 29, the receiver 2A performs bit determination on the detection signal.

  26 to 29, when the receiver 2B is used in place of the receiver 2, in steps S9 and S10 of FIG. 26, the receiver 2B changes the bit value from “0” to “1” in the bit string. The time length from the timing to the timing when the bit value changes from “1” to “0” is detected as the frame length, and the detected frame length is converted into a bit string. Further, in steps S9A and S10A of FIG. 27, the receiver 2B determines from the timing when the bit value changes from “0” to “1” to the timing when the bit value changes from “1” to “0” in the bit string. The time length is detected as the frame length, and the process of converting the detected frame length into a bit string is executed for the plurality of bit strings to obtain a plurality of bit strings. Further, in step S9B of FIGS. 28 and 29, the receiver 2B determines from the timing at which the bit value changes from “0” to “1” to the timing at which the bit value changes from “1” to “0” in the bit string. Is detected as a frame length.

  Therefore, the receiver according to the first embodiment includes a first process for receiving a radio frame, a second process for detecting a received signal of the radio frame, and a third process for determining a bit of a detection signal that is a detection result. A fourth process for detecting the frame length based on the bit string obtained by the bit determination, a fifth process for converting the frame length into a bit string, and the converted bit string is controlled by the controlled units 5 to 7. What is necessary is just to perform the 6th process which controls the to-be-controlled parts 5-7 based on control identifier CID when it corresponds to identifier CID. In the first embodiment, a program including the first to sixth processes is stored in the ROM, and the CPU reads out and executes the program from the ROM so as to perform the first to sixth processes. It may be.

  FIG. 31 is a schematic diagram illustrating a specific example of the wireless communication system 10 according to the first embodiment. With reference to FIG. 31, the wireless communication system 10 </ b> A includes a smart horn 30, a receiver 40, and a printer 50.

  The smart horn 30 has the configuration of the wireless device 1 described above. Then, the smart horn 30 transmits the control identifier CID of the printer 50 to the receiver 40 using the frame length by the same method as the wireless device 1.

  The receiver 40 includes any one of the receivers 2, 2 </ b> A, and 2 </ b> B described above. The receiver 40 receives the radio frame from the smart horn 30 and, when the bit string decoded based on the received signal of the received radio frame matches the control identifier CID of the printer 50, the printer 40 based on the control identifier CID. Turn on or off 50.

  As described above, in the wireless communication system 10A, the smart horn 30 controls on / off of the printer 50 when the wireless link is not established with another wireless device in the infrastructure mode.

  Therefore, the user of the smart horn 30 can control the printer 50 using the smart horn 30 as a remote controller (remote controller).

  The wireless communication system 10A may include an electrical device other than the printer 50, and is generally present in the vicinity of the user of the smart horn 30 in the workplace or home of the user of the smart horn 30. Any electrical device may be provided as long as it is an electrical device.

  As described above, the frame length modulation signal generation unit 12 of the radio apparatus 1 transmits radio frames to the receivers 2 to 4 according to steps S5, S5A, S5B, S5C, and 5D of the flowcharts shown in FIGS. According to the first embodiment, the frame length modulation signal generation unit 12 of the wireless device 1 shifts to the autonomous transmission mode and is controlled when the wireless link is not established with another wireless device in the infrastructure mode. The radio frame may be transmitted so that the control identifiers CID of the units 5 to 7 are expressed using the frame length of the radio frame.

  And as this autonomous transmission mode, an access point mode or an ad hoc mode may be used. The access point mode is a mode in which the wireless device 1 functions as a wireless LAN access point, and the ad hoc mode is a mode in which wireless devices other than the access point directly communicate with each other.

  The access point mode is a mode in which a wireless LAN access point originally controls communication between a wireless device belonging to itself and a network. Therefore, the original access point mode is a mode adopted by an access point that establishes a wireless link with a wireless device belonging to the access point.

  However, in the first embodiment, the access point mode is applied to the wireless device 1 that is in the infrastructure mode and has not established a wireless link with another wireless device (not belonging to the access point). As a result, when the wireless device 1 is in the infrastructure mode and has not established a wireless link with another wireless device, the wireless device 1 can transmit a wireless frame representing the control identifier CID by shifting to the access point mode. . Therefore, the access point mode employed in the first embodiment of the present invention is different from the original access point mode.

  In addition, the ad hoc mode is a mode in which a plurality of wireless devices perform wireless communication with each other without using an access point. Therefore, the original ad hoc mode is a mode that is employed when each wireless device establishes a wireless link with another wireless device.

  However, in the first embodiment, the ad hoc mode is applied to the wireless device 1 that is in the infrastructure mode and has not established a wireless link with another wireless device. As a result, when the wireless device 1 is in the infrastructure mode and has not established a wireless link with another wireless device, the wireless device 1 can transmit a wireless frame representing the control identifier CID by shifting to the ad hoc mode. Therefore, the ad hoc mode employed in the first embodiment is different from the original ad hoc mode.

  When the above-described access point mode or ad hoc mode is used as the autonomous transmission mode, the wireless device 1 shifts to the above-described access point mode or ad hoc mode in step S4 shown in FIGS.

  In FIG. 1, the receivers 2 to 4 and the controlled units 5 to 7 are illustrated so as to exist independently, but in the first embodiment, the receiver 2 and the controlled unit 5 are May be mounted on the same device.

Further, in the wireless device 1, the host system 13 outputs the instruction signal Comd2 to the frame length modulation signal generation unit 12, transmits the control identifier CID using the frame length, and then generates the instruction signal Comd1 as a frame length modulation signal. You may output to the part 12. That is, the wireless device 1 may shift from the infrastructure mode to the autonomous transmission mode, transmit the control identifier CID using the frame length, and then return to the infrastructure mode again.

  Furthermore, in the first embodiment, when the wireless device 1 is in the infrastructure mode, the wireless device 1 does not shift to the above-described autonomous transmission mode, and thus step S5 shown in FIG. 26, step S5A shown in FIG. 27, and step shown in FIG. The radio frame may be transmitted by executing any one of S5B, step S5C shown in FIG. 29, and step S5D shown in FIG. That is, when the wireless device 1 has established a wireless link with another wireless device in the infrastructure mode, the wireless device 1 is shown in step S5 shown in FIG. 26, step S5A shown in FIG. 27, step S5B shown in FIG. 28, and FIG. Either the step S5C or the step S5D shown in FIG. 30 may be executed to transmit the radio frame.

  Further, in the first embodiment, the wireless device 1 may transmit its own identification information (ID) or the above-described control identifier CID using the frame length. The length may be used for transmission.

  Further, in the first embodiment, the radio apparatus 1 uses a desired combination of a plurality of modulation schemes, a plurality of frame formats, a plurality of encryption schemes, and a plurality of frame types, and the radio apparatus 1 performs a radio frame as many times as the number of combinations. May be sent repeatedly.

  In the first embodiment, the frame length modulation signal generation unit 12 of the wireless device 1 constitutes “transmitting means”, and the host system 13 of the wireless device 1 constitutes “control means”.

[Embodiment 2]
FIG. 32 is a schematic diagram of a radio communication system according to the second embodiment. Referring to FIG. 32, radio communication system 100 according to Embodiment 2 includes radio apparatus 101, access point 102, receivers 103 to 105, and controlled units 106 to 108.

  The wireless device 101 has functions other than the function of switching the mode to the autonomous transmission mode among the functions of the wireless device 1. When the wireless device 101 belongs to the access point 102 in the infrastructure mode, the control identifier CID of the controlled unit (any of the controlled units 106 to 108) is obtained by the same method as the wireless device 1 described above. Broadcast a radio frame to represent.

  The access point 102 only receives a radio frame from the radio apparatus 101 and does not process a received signal of the received radio frame.

  The receivers 103 to 105 exist within the communication range of the wireless device 101. Each of the receivers 103 to 105 has the same configuration as any of the receivers 2, 2 </ b> A, and 2 </ b> B described above. Each of the receivers 103 to 105 intercepts the wireless frame transmitted by the wireless device 101 and decodes the received signal of the intercepted wireless frame by the method described above. Then, when the decoded bit strings match the control identifiers CID of the controlled units 106 to 108, the receivers 103 to 105 control the controlled units 106 to 108, respectively, based on the control identifier CID.

  Controlled units 106 to 108 are the same as controlled units 5 to 7 in the first embodiment.

  As described above, in the wireless communication system 100, the wireless device 101 belonging to the access point 102 broadcasts a wireless frame representing the control identifier CID, and the receivers 103 to 105 receive the wireless frame transmitted from the wireless device 101. Is intercepted and the controlled units 106 to 108 are controlled.

  Therefore, the controlled units 106 to 108 can be controlled using the wireless frame transmitted from the wireless device 101 in the infrastructure mode.

  FIG. 33 is a schematic diagram illustrating a specific example of the wireless communication system 100 illustrated in FIG. 32. Referring to FIG. 33, the wireless communication system 100A includes a smart horn 110, an access point 102, a receiver 120, and a printer 130.

  The smart horn 110 has the configuration of the wireless device 101. When the smart horn 110 belongs to the access point 102 in the infrastructure mode, the smart horn 110 broadcasts a wireless frame representing the control identifier CID of the printer 150 by the same method as the wireless device 1.

  The receiver 120 has the same configuration as any of the receivers 2, 2A, 2B. Then, the receiver 120 intercepts the radio frame transmitted from the smart horn 110 and decodes the bit string based on the received signal of the intercepted radio frame by the method described above. Thereafter, when the decoded bit string matches the control identifier CID of the printer 130, the receiver 120 turns the printer 130 on or off.

  In the wireless communication system 100A, the receiver 120 may be built in the printer 130. Also, the wireless communication system 100A may include an electrical device such as an illumination other than the printer 130.

  FIG. 34 is a flowchart showing the operation of the wireless communication system 100 shown in FIG. Note that, in FIG. 34, the operation of the wireless communication system 100 will be described by taking the case of controlling the controlled unit 106 as an example.

  Referring to FIG. 34, when the operation in wireless communication system 100 is started, when wireless apparatus 101 belongs to access point 102 in the infrastructure mode, step S5 in FIG. 26, step S5A in FIG. One of step S5B in FIG. 28, step S5C in FIG. 29, and step S5D in FIG. 30 is executed to transmit a radio frame (step S31).

  The access point 102 receives the radio frame (step S32). The receiver 103 intercepts the radio frame (step S33). And the receiver 103 performs the operation | movement shown in either of FIG. 26 to FIG. 30, and controls the to-be-controlled part 106 (step S34). As a result, the operation of the wireless communication system 100 ends.

  In step S31, when step S5 in FIG. 26 is executed, the receiver 103 executes the operation shown in FIG. 26. In step S31, when step S5A in FIG. 27, when step S5B in FIG. 28 is executed in step S31, the receiver 103 executes the operation shown in FIG. 28. In step S31, step S5C in FIG. 29 is executed. In such a case, the receiver 103 executes the operation shown in FIG. 29, and when step S5D in FIG. 30 is executed, the receiver 103 executes the operation shown in FIG.

  Also in the case of controlling the controlled units 107 and 108, the operation in the radio communication system 100 is executed according to the flowchart shown in FIG.

  As described above, in the wireless communication system 100, the receivers 103 to 105 intercept the wireless frame transmitted from the wireless device 101 in the infrastructure mode and control the controlled units 106 to 108.

  In the above description, it has been described that the wireless device 101 belongs to the access point 102. However, in the second embodiment, the wireless device 101 is not limited to this, and when the wireless device 101 belongs to the mobile router, the wireless device 101 performs wireless communication using the method described above. A frame may be transmitted.

  Other explanations in the second embodiment are the same as those in the first embodiment.

[Embodiment 3]
FIG. 35 is a schematic diagram of a radio communication system according to the third embodiment. Referring to FIG. 35, wireless communication system 200 according to Embodiment 3 is obtained by replacing wireless device 101 and access point 102 of wireless communication system 100 shown in FIG. 32 with wireless device 201 and access point 202, respectively. Others are the same as those of the wireless communication system 100.

  The wireless device 201 has a function other than the function of switching the mode to the autonomous transmission mode among the functions of the wireless device 1 described above. The wireless device 201 belongs to the access point 202 in the infrastructure mode. When the wireless device 201 belongs to the access point 202 in the infrastructure mode, the wireless device 201 broadcasts a wireless frame by the same method as the wireless device 1.

  In the infrastructure mode, the access point 202 receives a radio frame from the radio apparatus 201 and transfers the received radio frame.

  In the third embodiment, receivers 103 to 105 and controlled units 106 to 108 exist outside the communication range of radio apparatus 201 and exist within the communication range of access point 202. Thus, in the wireless communication system 200, the receivers 103 to 105 and the controlled units 106 to 108 are hidden terminals for the wireless device 201.

  The receivers 103 to 105 intercept the radio frame transmitted from the access point 202, decode the received signal of the intercepted radio frame into a bit string by the above-described method, and the decoded bit string of the controlled units 106 to 108 When it matches the control identifier CID, the controlled units 106 to 108 are controlled based on the control identifier CID.

  Therefore, the controlled units 106 to 108 to which radio waves from the radio apparatus 201 do not reach directly can be controlled using the radio frame transmitted from the access point 202 in the infrastructure mode.

  FIG. 36 is a schematic diagram showing a specific example of the wireless communication system 200 shown in FIG. Referring to FIG. 36, the wireless communication system 200A includes a smart horn 210, an access point 202, a receiver 220, and a printer 230.

The smart horn 210 exists in the communication range REG1. The smart horn 210 has functions other than the function of switching the mode to the autonomous transmission mode among the functions of the wireless device 1 described above. Smart horn 210 belongs to access point 202 in the infrastructure mode. When the smart horn 210 belongs to the access point 202 in the infrastructure mode, the smart horn 210 broadcasts a radio frame by the same method as the radio device 1.

  The access point 202 exists in the communication range REG1 and the communication range REG2.

  The receiver 220 exists outside the communication range REG1 and exists within the communication range REG2. The receiver 220 has the same configuration as any of the receivers 2, 2A, 2B. The receiver 220 intercepts the radio frame transmitted from the access point 202, decodes the received signal of the intercepted radio frame into a bit string by the method described above, and the decoded bit string is a control identifier of the controlled units 106 to 108. When matching with the CID, the controlled units 106 to 108 are controlled based on the control identifier CID.

  The printer 230 exists outside the communication range REG1, and exists within the communication range REG2.

  Thus, in the wireless communication system 200 </ b> A, the receiver 220 and the printer 230 are hidden terminals for the smart horn 210.

  When the smart horn 210 belongs to the access point 202 in the infrastructure mode, the smart horn 210 broadcasts a wireless frame by the same method as the wireless device 1.

  The access point 202 receives a radio frame from the smart horn 210 and transfers the received radio frame.

  The receiver 220 intercepts the radio frame transmitted from the access point 202, decodes the received signal of the intercepted radio frame into a bit string by the method described above, and the decoded bit string matches the control identifier CID of the printer 230. The printer 230 is turned on or off.

  Therefore, it is possible to control the printer 230 that is a hidden terminal with respect to the smart horn 210 using the wireless frame transmitted from the access point 202 in the infrastructure mode.

  In the wireless communication system 200A, the receiver 220 may be built in the printer 230.

  The wireless communication system 200A may include an electrical device other than the printer 230.

  FIG. 37 is a schematic diagram showing another specific example of the radio communication system 200 shown in FIG. Referring to FIG. 37, wireless communication system 200B is the same as wireless communication system 200A except that smart horn 210 of wireless communication system 200A shown in FIG. 36 is replaced with personal computer 240.

  The personal computer 240 is connected to the access point 202 by a wired cable 250. Then, the personal computer 240 transmits the control identifier CID of the printer 230 to the access point 202 via the wired cable 250.

In the wireless communication system 200B, the access point 202 has a function other than the function of switching the mode to the autonomous transmission mode among the functions of the wireless device 1 described above. The access point 202 receives the control identifier CID of the printer 230 from the personal computer 240 via the wired cable 250 and transmits a wireless frame representing the received control identifier CID in the same direction as the wireless device 1.

  The receiver 220 receives the radio frame transmitted from the access point 202, decodes the received signal of the received radio frame into a bit string by the method described above, and the decoded bit string matches the control identifier CID of the printer 230. The printer 230 is turned on or off.

  Thus, in the wireless communication system 200B, the access point 202 transmits a wireless frame representing the control identifier CID received from the personal computer 240.

  Therefore, the printer 230 to which the personal computer 240 cannot communicate directly can be controlled using the wireless frame transmitted by the access point 202.

  FIG. 38 is a flowchart showing the operation of the wireless communication system 200 shown in FIG. Note that, in FIG. 38, the operation of the wireless communication system 200 will be described taking the case where the controlled unit 106 is controlled as an example.

  The flowchart shown in FIG. 38 is the same as the flowchart shown in FIG. 34 except that step S35 is added to the flowchart shown in FIG.

  With reference to FIG. 38, when the operation of the wireless communication system 200 is started, the wireless device 201 executes step S301 described above.

  The access point 202 executes step S32 described above, and then transfers the radio frame (step S35).

  After step S35, the receiver 103 sequentially executes steps S33 and S34 described above. As a result, the operation of the wireless communication system 200 ends.

  Even when the controlled units 107 and 108 are controlled, the operation of the wireless communication system 200 is executed according to the flowchart shown in FIG.

  In the above description, the wireless device 201 belongs to the access point 202. However, in Embodiment 3, the present invention is not limited to this, and the wireless device 201 belongs to the mobile router. The radio frame may be transmitted by

  Other explanations in the third embodiment are the same as those in the first embodiment.

[Embodiment 4]
FIG. 39 is a schematic diagram of a radio communication system according to the fourth embodiment. Referring to FIG. 39, in wireless communication system 300 according to Embodiment 4, wireless device 1 of wireless communication system 10 shown in FIG. 1 is replaced with wireless device 301, and receivers 2-4 are replaced with receivers 302-304. Others are the same as those of the wireless communication system 10.

The wireless device 301 sets the control identifier CID of the controlled unit (one of the controlled units 5 to 7) to the difference frame length or the irrespective of whether its mode is the infrastructure mode and the autonomous transmission mode described above. A plurality of radio frames are transmitted as represented by the difference frame length / reference value.

  Each of the receivers 302 to 304 receives a plurality of radio frames from the radio apparatus 301 and detects a plurality of frame lengths of the received plurality of radio frames. Each of the receivers 302 to 304 calculates the difference frame length or the difference frame length / reference value by the above-described method based on the plurality of frame lengths, and the calculated difference frame length or difference frame length / reference value. Is converted into a bit string by the method described above. Thereafter, each of the receivers 302 to 304, when the bit string matches the control identifier CID of the controlled unit (any of the controlled units 5 to 7), controls the controlled unit (controlled unit 5) based on the control identifier CID. Any one of -7).

  40 is a schematic diagram showing the configuration of the wireless device 301 shown in FIG. Referring to FIG. 40, wireless device 301 is obtained by replacing frame length modulation signal generation unit 12 of wireless device 1 shown in FIG. 2 with frame length modulation signal generation unit 3011 and replacing host system 13 with host system 3012. Others are the same as those of the wireless device 1.

  The frame length modulation signal generation unit 3011 includes a plurality of frame lengths representing a control identifier CID for controlling the controlled unit (one of the controlled units 5 to 7), and a plurality of radio frames having the plurality of frame lengths. And a plurality of radio frames having a plurality of received frame lengths are broadcast to the receivers 302 to 304 by the communication method received from the host system 3012.

  The host system 3012 holds control identifiers CID_A to CID_C of the controlled units 5 to 7 in advance.

  In addition, when the host system 3012 controls the controlled unit (any of the controlled units 5 to 7), the difference frame length or the difference frame length / reference value is controlled by the control identifier CID (control) according to the method in the first embodiment. A plurality of frame lengths are determined to represent the identifiers CID_A to CID_C). Then, the host system 3012 outputs the determined plurality of frame lengths and a communication scheme for transmitting a plurality of radio frames having the plurality of frame lengths to the frame length modulation signal generation unit 3011.

  41 is a schematic diagram showing the configuration of the receiver 302 shown in FIG. Referring to FIG. 41, receiver 302 replaces envelope detection circuit 23 of receiver 2 shown in FIG. 3 with detection circuit 3021, replaces frame length detection circuit 25 with frame length detection circuit 3022, and replaces frame length determination circuit with frame length detection circuit 3022. 26 is replaced with a frame length determination circuit 3023, and the other configuration is the same as that of the receiver 2.

  The detection circuit 3021 detects a plurality of reception signals of a plurality of radio frames received from the unnecessary wave removal circuit 22 by any one of envelope detection, synchronous detection, and reproduction detection, and the detected plurality of detection signals are bit determination devices. To 24.

  The frame length detection circuit 3022 receives a plurality of bit strings from the bit determiner 24 and detects a plurality of frame lengths based on the received plurality of bit strings. More specifically, the frame length detection circuit 3022 counts the accumulated value of the number “1” in one bit string, and multiplies the counted accumulated value by a bit determination period to detect the frame length. This is executed for a plurality of bit strings to detect a plurality of frame lengths. Also, the frame length detection circuit 3022 calculates the time length from the timing when the bit value changes from “0” to “1” to the timing when the bit value changes from “1” to “0” in one bit string. Is detected for a plurality of bit strings, and a plurality of frame lengths are detected.

  Then, the frame length detection circuit 3022 outputs the detected plurality of frame lengths to the frame length determination circuit 3023.

  The frame length determination circuit 3023 receives a plurality of frame lengths from the frame length detection circuit 3022, calculates a difference frame length or a difference frame length / reference value by the above-described method based on the received plurality of frame lengths, The calculated difference frame length or difference frame length / reference value is converted into a bit string by the method described above. The frame length determination circuit 3023 generates a control signal when the bit string matches the control identifier CID of the controlled unit 5, and outputs the generated control signal to the controlled unit 5.

  On the other hand, when the bit string does not match the control identifier CID of the controlled unit 5, the frame length determination circuit 3023 discards the bit string.

  Each of the receivers 303 and 304 shown in FIG. 39 has the same configuration as that of the receiver 302 shown in FIG.

  FIG. 42 is a flowchart showing the operation of the wireless communication system 300 shown in FIG. In FIG. 42, the operation of the wireless communication system 300 will be described by taking the case of controlling the controlled unit 5 as an example.

  Referring to FIG. 42, when the operation of the wireless communication system 300 is started, the host system 3012 of the wireless device 301 determines whether to start control of the control target device (step S41).

  If it is determined in step S41 that the control of the control target device is started, the host system 3012 of the wireless device 301 may represent the control identifier CID of the control target device by the difference frame length by the method described in the first embodiment. A plurality of frame lengths are determined (step S42). In this case, the host system 3012 determines a difference between a reference frame length composed of one frame length selected from a plurality of frame lengths and a remaining frame length other than the reference frame length among the plurality of frame lengths. Alternatively, a plurality of frame lengths are determined so as to represent the control identifier CID by a plurality of differential frame lengths.

  Then, the host system 3012 of the wireless device 301 outputs the determined plurality of frame lengths and a communication scheme for transmitting a plurality of wireless frames having a plurality of frame lengths to the frame length modulation signal generation unit 3011.

  The frame length modulation signal generation unit 3011 of the wireless device 301 receives a plurality of frame lengths and communication methods from the host system 3012, and transmits a plurality of wireless frames having a plurality of frame lengths according to the received communication methods (step S43). ).

  In the receiver 302, the unwanted wave removal circuit 22 receives a plurality of radio waves via the antenna 21, and removes the unwanted waves from the received plurality of received radio waves to extract a plurality of reception signals having a radio frame frequency. To do. Thereby, the receiver 302 receives a plurality of radio frames (step S44). Then, the unnecessary wave removal circuit 22 outputs the extracted reception signals to the detection circuit 3021.

  The detection circuit 3021 detects a plurality of received signals received from the unnecessary wave removal circuit 22 at regular intervals (step S45), and outputs the detected plurality of detection signals to the bit decision unit 24. In this case, the detection circuit 3021 detects a plurality of received signals at regular intervals using any one of envelope detection, synchronous detection, and regenerative detection.

  The bit determination unit 24 converts each of the plurality of detection signals received from the detection circuit 3021 into a bit value of “0” or “1” to perform bit determination on the plurality of detection signals (step S46), and thereby detects the plurality of detection signals. Is converted to multiple bit strings. Then, the bit determination unit 24 outputs the plurality of converted bit strings to the frame length detection circuit 3022.

  The frame length detection circuit 3022 detects a plurality of frame lengths by the above-described method based on the plurality of bit strings received from the bit determination unit 24 (step S47). Then, the frame length detection circuit 3022 outputs the detected plurality of frame lengths to the frame length determination circuit 3023.

  Based on the plurality of frame lengths, the frame length determination circuit 3023 calculates one or more difference frame lengths by the method described above, and converts the calculated one or more difference frame lengths into a bit string (step S48). ).

  When one or more differential frame lengths are converted into bit strings, the frame length determination circuit 3023 determines whether the bit string matches the control identifier CID of the controlled unit 5 (step S49).

  When it is determined in step S49 that the bit string matches the control identifier CID, the frame length determination circuit 3023 generates a control signal and outputs it to the controlled unit 5. That is, the frame length determination circuit 3023 controls the controlled unit 5 based on the control identifier CID (step S50).

  In step S50, the frame length determination circuit 3023 of the receiver 302 adjusts the control content for turning on the controlled unit 5, the control content for turning off the controlled unit 5, and the light intensity of the controlled unit 5 (illumination). A control signal including any of the control content and the control content for adjusting the volume of the controlled unit 5 (speaker) is generated, and the generated control signal is output to the controlled unit 5. As a result, the controlled unit 5 is turned on or off, the light intensity is adjusted, or the volume is adjusted.

  Then, when it is determined in step S49 that the bit string does not match the control identifier CID, or after step S50, the series of operations ends.

  Even when the controlled units 6 and 7 are controlled, the operation of the wireless communication system 300 is executed according to the flowchart shown in FIG.

  As described above, the wireless device 301 transmits a plurality of wireless frames so that the control identifier CID of the controlled unit (one of the controlled units 5 to 7) is represented by the difference frame length (see steps S42 and S43).

  As a result, even if the frame lengths of a plurality of radio frames change due to wireless communication, the plurality of frame lengths change in the same manner, and thus the difference in the frame length is removed by calculating the difference frame length. . Therefore, the receivers 302 to 304 can accurately receive the control identifier CID.

  FIG. 43 is another flowchart showing the operation of the wireless communication system 300 shown in FIG. Note that, also in FIG. 43, the operation of the wireless communication system 300 will be described by taking the case of controlling the controlled unit 5 as an example.

  The flowchart shown in FIG. 43 is the same as the flowchart shown in FIG. 42 except that steps S42 and S48 in the flowchart shown in FIG. 42 are replaced with steps S42A and S48A, respectively.

  Referring to FIG. 43, when the operation of wireless communication system 300 is started, wireless device 301 executes step S41 described above, and when it is determined to start control of the control target device, A plurality of frame lengths are determined so that the control identifier CID is represented by the difference frame length / reference value (step S42A). In this case, the wireless device 301 has a plurality of differences between a reference frame length made up of one frame length selected from a plurality of frame lengths and a remaining frame length other than the reference frame length among the plurality of frame lengths. The plurality of frame lengths are represented by one or more difference frame lengths / reference values obtained by dividing the difference frame length by a reference value composed of one difference frame length selected from the plurality of difference frame lengths. decide.

  And the radio | wireless apparatus 301 performs step S43 mentioned above.

  Thereafter, the receiver 302 sequentially executes Steps S44 to S47 described above. After step S47, the frame length determination circuit 3023 calculates one or more difference frame lengths / reference values based on the plurality of frame lengths according to the method described above, and the calculated one or more difference frame lengths. / The reference value is converted into a bit string (step S48A).

  And step S49, S50 mentioned above is performed sequentially, and operation | movement of the radio | wireless communications system 300 is complete | finished.

  Even when the controlled units 6 and 7 are controlled, the operation of the wireless communication system 300 is executed according to the flowchart shown in FIG.

  As described above, the wireless device 301 transmits a plurality of wireless frames so that the control identifier CID of the controlled unit (one of the controlled units 5 to 7) is represented by one or a plurality of differential frame lengths / reference values. (See steps S42A and S43).

  As a result, even if the frame lengths of a plurality of radio frames change due to wireless communication, the plurality of frame lengths change in the same manner. Therefore, by calculating the difference frame length / reference value, the change in the frame length can be reduced. Removed. Therefore, the receivers 302 to 304 can accurately receive the control identifier CID.

  As described above, in Embodiment 4, radio apparatus 301 transmits a plurality of radio frames such that control identifiers CID of controlled units 5 to 7 are represented by a differential frame length or a differential frame length / reference value.

  Here, calculating the difference frame length is equivalent to subtracting the frame length, and calculating the difference frame length / reference value is subtracting the frame length and calculating the subtraction result (= difference frame length). This is equivalent to dividing by the reference value (= difference frame length).

  In Embodiment 4, radio apparatus 301 applies not only frame length subtraction and frame length subtraction and division, but also one or more calculations arbitrarily selected from the four arithmetic operations for the frame length. A plurality of radio frames may be transmitted so as to represent the control identifier CID of the controlled units 5 to 7 according to the calculation result.

In the fourth embodiment, the wireless device 301 controls the control identifier CI of the controlled units 5 to 7.
Although it has been described that a plurality of radio frames are transmitted so that D is represented by the difference frame length or the difference frame length / reference value, in Embodiment 4, the present invention is not limited to this, and the radio apparatus 301 transmits a transmission desired to be transmitted to the transmission destination. A plurality of radio frames may be transmitted so that the information is represented by a differential frame length or a differential frame length / reference value.

  Therefore, the radio apparatus according to the fourth embodiment has a plurality of frames so as to represent transmission information to be transmitted to a transmission destination by a calculation result calculated by applying a desired calculation method to a plurality of frame lengths of a plurality of radio frames. What is necessary is just to provide the determination means which determines length, and the transmission means which transmits the several radio | wireless frame which has the several frame length determined by the determination means.

  If a desired calculation method is applied to a plurality of frame lengths, a calculation result obtained by applying the desired calculation method to a plurality of frame lengths even if a plurality of frame lengths of a plurality of radio frames change due to wireless communication This is because the change in the frame length is removed and the receiver can accurately receive the transmission information.

  The receiver according to the fourth embodiment is detected by a receiving unit that receives a plurality of radio frames from the radio apparatus according to the fourth embodiment, a detection unit that detects a plurality of frame lengths of the plurality of radio frames, and a detection unit. It suffices to include calculation means for calculating a plurality of frame lengths by applying a desired calculation method and decoding means for decoding transmission information based on the calculation result calculated by the calculation means.

  If transmission information is decoded based on a calculation result obtained by applying the same calculation method to a plurality of frame lengths as a wireless device that transmits a plurality of wireless frames, even if the plurality of frame lengths change due to wireless communication, This is because the change in the frame length is removed from the calculation result obtained by applying a desired calculation method to the frame length, and the receiver can receive the transmission information accurately.

  Furthermore, in Embodiment 4, the wireless device 301 may execute transmission of a plurality of wireless frames by a program. In this case, the wireless device 301 includes a CPU, a ROM, and a RAM. The program for causing the computer (CPU) to transmit the transmission information is the transmission information based on the calculation result calculated by the determining unit by applying a desired calculation method to the plurality of frame lengths of the plurality of radio frames. And a second step of transmitting a plurality of radio frames having a plurality of frame lengths determined in the first step. Just do it.

  This program is stored in the ROM, and the CPU reads and executes the program stored in the ROM, and transmits a plurality of radio frames. In this case, the CPU performs a calculation using a desired calculation method for a plurality of frame lengths using the RAM, and determines a plurality of frame lengths.

Furthermore, in Embodiment 4, the receivers 302 to 304 may cause a computer to receive a plurality of radio frames. In this case, each of the receivers 302 to 304 includes a CPU, a ROM, and a RAM. A program for causing a computer (CPU) to receive transmission information includes a first step in which a reception unit receives a plurality of radio frames, and a detection unit that determines a plurality of frame lengths of the plurality of radio frames. The second step of detecting, the third step of calculating by applying a desired calculation method to the plurality of frame lengths detected by the detecting means, and the decoding means are calculated by the calculating means. And a fourth step of decoding the transmission information based on the calculation result. This program is stored in the ROM, and the CPU reads and executes the program stored in the ROM, receives a plurality of radio frames, and performs a decoding process on the received plurality of radio frames. In this case, the CPU performs a calculation using a desired calculation method for a plurality of frame lengths using the RAM.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and is intended to include meanings equivalent to the scope of claims for patent and all modifications within the scope.

  The present invention is applied to a wireless device, a wireless communication system including the same, a program for causing a computer to execute transmission of a wireless frame in the wireless device, and a program for causing the computer to receive a wireless frame transmitted from the wireless device. Is done.

  1, 101, 201, 301 Wireless device, 2-4, 2A, 2B, 40, 103-105, 120, 220, 302-304 Receiver, 5-7, 106-108 Controlled part 10, 10A, 100 , 100A, 200, 200A, 200B wireless communication system, 11, 21 antenna, 12, 3011 frame length modulation signal generation unit, 13, 3012 host system, 22 unnecessary wave removal circuit, 23 envelope detection circuit, 24-bit decision unit, 25, 25A, 3022 Frame length detection circuit, 26, 3023 Frame length determination circuit, 27 Synchronous detection circuit, 30, 110, 210 Smartphone, 50, 130, 230 Printer, 102, 202 Access point, 221, 223 BPF, 222 , 224 Frequency conversion circuit, 225, 273 LPF, 2 0 personal computer, 241 threshold determination unit, 242 register, 243 operation unit, 250 a wire cable, 271 multipliers, 272 a carrier recovery circuit, 3021 the detection circuit.

Claims (17)

A wireless device that performs wireless communication belonging to an access point in infrastructure mode in normal operation,
When a wireless link is not established between the wireless device and the access point or another wireless device in the infrastructure mode, a wireless frame can be transmitted autonomously when transmission of transmission information to be transmitted is started. A control means for outputting a mode transition signal instructing transition to an autonomous transmission mode,
When receiving the mode transition signal from the control means, the transmission means shifts from the infrastructure mode to the autonomous transmission mode and transmits a radio frame so as to represent the transmission information using a frame length of the radio frame. Wireless device. The wireless device according to claim 1 , wherein the autonomous transmission mode is an access point mode in which the wireless device functions as a wireless LAN access point. The wireless device according to claim 1 , wherein the autonomous transmission mode is an ad hoc mode in which wireless devices other than the access point directly communicate with each other. 4. The radio apparatus according to claim 1 , wherein the transmission unit transmits the radio frame while fixing a modulation scheme, a frame format, an encryption scheme, and a frame type. 5. The transmission means repeatedly transmits the radio frame a number of times equal to the number of combinations using a desired combination of a plurality of modulation schemes, a plurality of frame formats, a plurality of encryption schemes, and a plurality of frame types. The wireless device according to any one of claims 1 to 3 . The transmission information identifies a control target device is the control of the object, and a control identifier for controlling the control target device, the wireless device according to any one of claims 1 to 5 . A wireless device according to claim 6 ;
Receiving the wireless frame from the wireless device, detecting the received radio frame radio wave to detect the frame length of the wireless frame, generating a bit string based on the detected frame length, the generated bit string And a receiver that outputs a control signal when it matches the control identifier. A program that causes a computer to execute transmission of a wireless frame in a wireless device that performs wireless communication belonging to an access point in infrastructure mode in normal operation,
When the control means starts control of the control target device when a wireless link is not established between the wireless device and the access point or another wireless device in the infrastructure mode, the wireless device A first step of shifting to an autonomous transmission mode capable of autonomous transmission;
A second step of transmitting a radio frame to the computer so that the transmission means identifies the control target device and represents a control identifier for controlling the control target device using a frame length of the radio frame; A program to be executed. The program for causing a computer to execute the autonomous transmission mode according to claim 8 , wherein the wireless device is an access point mode in which the wireless device functions as a wireless LAN access point. The program for causing a computer to execute the autonomous transmission mode according to claim 8 , which is an ad hoc mode in which wireless devices other than the access point directly communicate with each other. In the second step, the transmission unit, modulation scheme, frame format, to secure the encryption method and frame type for transmitting the radio frame, according to any one of claims 10 claims 8 A program that causes a computer to execute. In the second step, the transmission means uses the combination of a plurality of modulation schemes, a plurality of frame formats, a plurality of encryption schemes, and a plurality of frame types to count the radio frame equal to the number of combinations. The program for making a computer run in any one of Claims 8-10 which transmits repeatedly only. A program for causing a computer to receive a radio frame transmitted by the radio device according to claim 1 ,
A first step of receiving a radio frame transmitted by the radio apparatus according to claim 1 without controlling communication parameters;
A second step of detecting a detected signal by detecting a received radio wave of the radio frame received by the receiving unit;
A third step in which a converting means bit-determines the detection signal and converts the detection signal into a bit string;
A program for causing the computer to execute a fourth step in which the detection means detects a frame length of the radio frame based on the bit string. A wireless device that performs wireless communication belonging to an access point in infrastructure mode in normal operation,
Generating means for generating a radio frame so as to represent transmission information desired to be transmitted using the frame length of the radio frame;
A radio apparatus comprising: a transmitting unit that transmits the radio frame with a modulation scheme, a frame format, an encryption scheme, and a frame type fixed. A wireless device that performs wireless communication belonging to an access point in infrastructure mode in normal operation,
Generating means for generating a radio frame so as to represent transmission information desired to be transmitted using the frame length of the radio frame;
A radio apparatus comprising: a transmission unit that repeatedly transmits the radio frame a number of times equal to the number of combinations using a desired combination of a plurality of modulation schemes, a plurality of frame formats, a plurality of encryption schemes, and a plurality of frame types. The wireless device according to claim 14 or 15 , wherein the transmission information is a control identifier for identifying a control target device that is a control target and controlling the control target device. A program for causing a computer to receive a radio frame transmitted by the radio device according to any one of claims 14 and 15 ,
A first step of receiving a wireless frame transmitted by the wireless device according to any one of claims 14 and 15 without controlling a communication parameter;
A second step of detecting a detected signal by detecting a received radio wave of the radio frame received by the receiving unit;
A third step in which a converting means bit-determines the detection signal and converts the detection signal into a bit string;
A program for causing the computer to execute a fourth step in which the detection means detects a frame length of the radio frame based on the bit string.

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