JP2008011048A - Wireless transmission device, wireless reception device, and wireless transmission / reception device - Google Patents

Abstract

In a wireless network system, the number of intermittent reception operations of a wireless receiver is reduced to save power.
A radio transmission apparatus includes a transmission destination generating information by adding identification information of a transmission destination and a repetition number of headers to information data to be transmitted, and adding a predetermined number of headers for the transmission destination. A processing unit 30; a transmission circuit 20 that generates a transmission signal by modulating a carrier wave based on transmission data generated by the signal processing unit; and an antenna that receives the transmission signal generated by the transmission circuit and transmits radio waves 10.
[Selection] Figure 1

Description

  The present invention relates to a wireless transmission device, a wireless reception device, and a wireless transmission / reception device used in a specific low power wireless system such as a wireless meter reading system or a home network.

  In recent years, wireless meter reading systems that measure the amount of gas or electricity used in each home using wireless communication and home networks that detect indoor temperature using wireless communication have been used. In general, such a wireless network system is collectively referred to as a specific low-power wireless system, and includes a wireless transmission device and a wireless reception device, or a wireless transmission / reception device having a wireless transmission function and a reception function. These devices are sometimes referred to by the names of the parent device and the child device, particularly focusing on the communication form between the devices.

  For example, the child device is installed in each house, and further, a temperature sensor mounted on an air conditioner or the like installed indoors is connected to the child device. On the other hand, the master unit is installed on a power pole or the like so as to cover an area where a plurality of slave units are scattered, and performs wireless communication with the slave unit. The parent device is connected to a server or the like by a wired line. With this configuration, a system administrator can centrally manage room temperature information of each house using a server or the like. As a result, the labor of the manager visiting the site and collecting room temperature information is reduced.

  In such a wireless network system, for example, when the slave unit is installed in the vicinity of the gas meter, it is difficult to use a commercial power source in the slave unit. For such reasons, a battery is often used as the operating power source of the slave unit. In order to reduce the consumption of the mounted battery, it is important to realize power saving in the operation of the slave unit. Various technologies have been developed for this purpose.

  For example, the child device performs an intermittent reception operation in order to receive transmission information from the parent device, and repeats the reception operation and the reception standby at a constant cycle. When the parent device transmits transmission information to a specific child device, the destination child device checks whether or not the transmission information transmitted from the parent device is addressed to itself during the reception operation period. If the transmission information is addressed to itself, the reception operation is continued. If the transmission information is not addressed to itself, the reception operation is stopped and the intermittent reception operation is performed again.

As a related technique, in Patent Document 1 below, a transmitting-side radio continuously encodes and transmits system identification information and a shortened call name, and a receiving-side radio intermittently performs a carrier sense operation. When the radio wave is detected repeatedly, system identification information and abbreviated call name information are detected from the detected radio wave, and the proper radio call name and control information of the own radio following this information are received. A wireless system that initiates a wireless communication operation is disclosed. According to this wireless system, only regular communication can be accurately identified without being affected by noise or the like, and battery consumption can be reduced. However, Patent Document 1 does not particularly disclose the power saving by reducing the number of intermittent reception operations of the reception-side radio.
JP-A-10-198881 (7th page, FIG. 1)

  Therefore, in view of the above points, an object of the present invention is to reduce power consumption by reducing the number of intermittent reception operations of a reception-side wireless device in a wireless network system.

  In order to solve the above-described problem, the wireless transmission device according to the first aspect of the present invention includes the number of headers defined for the transmission destination, including the transmission destination identification information and the number of header repetitions in the information data to be transmitted. Signal processing means for generating transmission data, a transmission circuit for generating a transmission signal by modulating a carrier wave based on the transmission data generated by the signal processing means, and a transmission signal generated by the transmission circuit And an antenna for transmitting radio waves.

  Here, the wireless transmission device further includes storage means for storing identification information of a plurality of transmission destinations, and control means for reading out identification information of a desired transmission destination from the storage means and supplying the identification information to the signal processing means. May be.

  A radio receiving apparatus according to a second aspect of the present invention includes an antenna that receives radio waves and generates a reception signal, and a reception that generates reception data by amplifying and demodulating the reception signal generated by the antenna. In the header included in the reception data generated by the circuit and the reception circuit, there are signal processing means for detecting the identification information of the transmission destination and the number of repetitions of the header, and transmission destination identification information detected by the signal processing means. Control means for stopping the reception operation in a period corresponding to the number of repetitions of the header detected by the signal processing means when it does not match the identification information assigned to the wireless reception device.

  Here, the wireless reception apparatus further includes storage means for storing information indicating a correspondence relationship between the number of repetitions of the header and the period for stopping the reception operation, and the control means repeats the header detected by the signal processing means. Based on the number, information regarding a period during which the reception operation is stopped may be read from the storage unit.

  Furthermore, a wireless transmission / reception apparatus (master unit) according to the third aspect of the present invention generates an antenna for transmitting / receiving radio waves, and generates a transmission signal by modulating a carrier wave based on transmission data at the time of transmission and supplies the transmission signal to the antenna. A transmission / reception circuit that generates reception data by amplifying and demodulating a reception signal generated by an antenna at the time of reception, and information to be transmitted includes transmission destination identification information and the number of header repetitions. Signal processing means for generating transmission data by adding a predetermined number of headers and supplying the transmission data to a transmission / reception circuit.

  In addition, a wireless transmission / reception apparatus (slave unit) according to the fourth aspect of the present invention generates an antenna for transmitting and receiving radio waves, modulates a carrier wave based on transmission data, and supplies the antenna to the antenna during transmission. In reception, the transmission / reception circuit that generates reception data by amplifying and demodulating the reception signal generated by the antenna, and the identification information of the transmission destination in the header included in the reception data generated by the transmission / reception circuit And signal processing means for detecting the number of repetitions of the header, and the signal processing means detected when the identification information of the transmission destination detected by the signal processing means does not match the identification information assigned to the wireless transmission / reception apparatus. Control means for stopping the reception operation in a period corresponding to the number of repetitions of the header.

According to the present invention, transmission data is generated by adding a transmission destination identification information and a header including the number of header repetitions to the information data on the transmission side, and the transmission destination identification information is assigned to the wireless reception device on the reception side. When the reception operation is stopped in a period corresponding to the number of repeated headers when the identification information does not match, the number of intermittent reception operations of the reception-side wireless device can be reduced to save power.

The best mode for carrying out the present invention will be described below in detail with reference to the drawings. In addition, the same reference number is attached | subjected to the same component and description is abbreviate | omitted.
FIG. 1 is a block diagram showing a configuration of a radio transmission apparatus according to the first embodiment of the present invention. The wireless transmission device 100 includes an antenna 10, a transmission circuit 20, a signal processing circuit 30, a CPU 40, and a memory 50. The wireless transmission device 100 can transmit radio waves from the antenna 10 and perform wireless communication with the wireless reception device 200 shown in FIG.

  The memory 50 includes a non-volatile memory that can retain data even when the power of the wireless transmission device 100 is turned off. The ID information of the wireless transmission device 100, the ID information of each wireless reception device, and each wireless reception device The information regarding the period of the intermittent reception operation in is stored.

  The CPU 40 generates information data by adding an error correction code to the information to be transmitted and encoding the information. The information to be transmitted includes, for example, information indicating the data length, ID information of the wireless transmission device 100, command information for the wireless reception device, and / or information input from an external device such as a server or a sensor. . Further, the CPU 40 as a control unit controls the transmission circuit 20 and the signal processing circuit 30 by supplying control signals and necessary information.

  The signal processing circuit 30 includes a repetition number generation circuit 31, an identification number generation circuit 32, a frame synchronization signal generation circuit 33, a bit synchronization signal generation circuit 34, and a switching circuit 35. The repetition number generation circuit 31 generates data representing the repetition number of the header included in the transmission signal based on the information from the CPU 40, and adds this to the head of the information data output from the CPU 40. The identification number generation circuit 32 generates data representing the identification number based on information from the CPU 40 and adds this to the head of the data output from the repetition number generation circuit 31.

  The frame synchronization signal generation circuit 33 generates a frame synchronization signal and adds it to the head of the data output from the identification number generation circuit 32. The bit synchronization signal generation circuit 34 generates a bit synchronization signal and adds it to the head of the data output from the frame synchronization signal generation circuit 33. As a result, a header including a bit synchronization signal, a frame synchronization signal, data representing an identification number, and data representing the number of repetitions is added to the head of the information data.

  Data output from the bit synchronization signal generation circuit 34 is input to the switching circuit 35. The switching circuit 35 returns the data output from the bit synchronization signal generation circuit 34 to the repetition number generation circuit 31 as many times as necessary, thereby adding a predetermined number of headers for the transmission destination to the head of the information data. . Thereafter, the switching circuit 35 outputs the transmission data generated in this way to the transmission circuit 20.

  The transmission circuit 20 modulates a carrier wave based on the transmission data output from the signal processing circuit 30, thereby supplying the modulated carrier wave to the antenna 10 as an RF (Radio Frequency) transmission signal. Thereby, a radio wave is transmitted from the antenna 10.

  FIG. 2 is a diagram showing a frame structure of transmission data generated in the wireless transmission device shown in FIG. The wireless transmission device 100 configures transmission data in a format defined in the wireless network system. As shown in FIG. 2, the transmission data can be broadly divided into a header string and information data. The header string is composed of a plurality of headers 1 to N, where “N” represents the number of headers included in the header string. For example, when the number of headers is 3, N = 3 and the header row is composed of headers 1 to 3. Further, one header is composed of information fields A to D.

  The information field A is composed of a bit synchronization signal, the information field B is composed of a frame synchronization signal, the information field C is composed of an identification number, and the information field D is composed of a repetition number. Regarding the headers 1 to N, the information constituting the information fields A to D is the same except for the number of repetitions. Transmission data is constituted by the header string and the information data. The wireless reception device starts reception from the bit synchronization signal of the header N, and receives transmission data in the order of the frame synchronization signal, the identification number, and the repetition number.

  The bit synchronization signal is a specific bit string formed by repetition of “0” and “1”, and the radio reception apparatus can establish bit synchronization by detecting the bit synchronization signal. The frame synchronization signal is a specific bit string composed of a combination of “0” and “1”, and the wireless reception device establishes frame synchronization by detecting the frame synchronization signal. It can be recognized that the subsequent signal is valid information.

  The identification number represents to which radio reception device the transmission signal transmitted from the radio transmission device 100 is directed. Since the identification number differs depending on each wireless reception device, the wireless reception device detects the identification number, so that the transmission signal transmitted from the wireless transmission device 100 is addressed to itself or another wireless reception device. It can be determined whether it is addressed.

  In the present embodiment, the wireless transmission device 100 transmits the number of header repetitions, thereby reducing the number of intermittent reception operations in the wireless reception device. Since the wireless receiver can know how many times the header is repeated based on the number of received repetitions, when the transmission signal is not addressed to itself, stop the intermittent reception operation while the header is repeated Can do. As a result, power consumption in the wireless reception device is reduced, and battery life can be extended when the wireless reception device is battery-driven.

  As illustrated in FIG. 2, the wireless transmission device 100 generates one or a plurality of headers each formed of information fields A to D. The number of headers is set based on the period of the intermittent reception operation of the wireless reception device that is the destination to which the wireless transmission device 100 transmits the transmission information. For example, when generating three headers, the wireless transmission device 100 sets the number of repetitions included in the header 1 to 1, sets the number of repetitions included in the header 2 to 2, and is included in the header 3 Set the number of repetitions to 3. The operation for setting the number of repetitions will be described later. In the transmission data, information data is added after the number of repetitions included in the header 1. The information data includes command information for the wireless receiver.

  In the present embodiment, the bit synchronization signal is composed of 24 bits, and the frame synchronization signal is composed of 32 bits. The identification number and the repetition number are composed of 96 bits in total, and the information data can be arbitrarily determined by information indicating the data length. The 96 bits constituting the identification number and the repetition number are encoded by a BCH (Bose Chaudhuri Hocquenghem) code so that the identification number and the repetition number are not affected by noise or the like. In the present embodiment, BCH (32:21) encoding is performed on 96 bits constituting the identification number and the number of repetitions for dividing data into 32 bits including 11 redundant bits.

  In the transmission data shown in FIG. 2, for example, a flag signal indicating a communication state may be added in addition to the information described above. Further, the identification number and the repetition number are encoded by the BCH code, but may be encoded by another encoding method such as a CRC (Cyclic Redundancy Check) code.

The operation of the wireless transmission device according to the present embodiment will be described with reference to FIG.
The CPU 40 generates command information for the wireless reception device as information data, and outputs the information data to the repetition number generation circuit 31. Further, the CPU 40 obtains information about the period of the intermittent reception operation of the wireless reception device that is the destination of the transmission information from the memory 50, determines the number of headers based on this information, and sends the repetition number to the repetition number generation circuit 31. Set.

  Here, the number of headers included in the transmission signal is set to be longer than the period of the intermittent reception operation of the wireless reception device so that the wireless reception device that is the destination of the transmission information can reliably receive the transmission information. Is done. For example, when the CPU 40 determines that the number of headers is 3 based on the period of the intermittent reception operation of the wireless reception device, the repetition number generation circuit 31 first sets the repetition number to 1 and sets the number of headers at the head of the information data. And output to the identification number generation circuit 32.

  Further, the CPU 40 acquires the identification number of the wireless reception device that is the destination of the transmission information from the memory 50 and sets the identification number in the identification number generation circuit 32. The identification number generation circuit 32 adds an identification number to the head of the data output from the repetition number generation circuit 31 and outputs it to the frame synchronization signal generation circuit 33.

  The frame synchronization signal generation circuit 33 adds a frame synchronization signal to the head of the data output from the identification number generation circuit 32 and outputs it to the bit synchronization signal generation circuit 34. The bit synchronization signal generation circuit 34 adds a bit synchronization signal to the head of the data output from the frame synchronization signal generation circuit 33. In this way, the repetition number generation circuit 31 to the bit synchronization signal generation circuit 34 add the header 1 with the repetition number 1 to the head of the information data.

  Similarly, the repetition number generation circuit 31 to the bit synchronization signal generation circuit 34 add the header 2 with the repetition number 2 to the head of the header 1. By repeating such an operation, a set number of headers are added to the head of the information data, and transmission data is generated. The transmission circuit 20 generates an RF transmission signal based on the transmission data, and transmits the radio wave by supplying the transmission signal to the antenna 10.

Next, a radio reception apparatus according to the second embodiment of the present invention will be described.
FIG. 3 is a block diagram showing a configuration of a radio reception apparatus according to the second embodiment of the present invention. The wireless reception device 200 includes an antenna 10, a reception circuit 60, a signal processing circuit 70, a CPU 40, and a memory 50. The reception circuit 60 demodulates an RF reception signal (modulated carrier) supplied from the antenna 10 that has received the radio wave, thereby generating reception data and outputting the reception data to the signal processing circuit 70.

  The signal processing circuit 70 includes a bit synchronization signal detection circuit 71, a frame synchronization signal detection circuit 72, an identification number detection circuit 73, a repetition number detection circuit 74, and a switching circuit 75. The reception data output from the reception circuit 60 is input to the bit synchronization signal detection circuit 71.

  The bit synchronization signal detection circuit 71 detects a bit synchronization signal included in the input received data and notifies the CPU 40 of the detection of the bit synchronization signal, and also transmits data following the bit synchronization signal to the frame synchronization signal detection circuit. 72. The frame synchronization signal detection circuit 72 detects the frame synchronization signal included in the input received data and notifies the CPU 40 of the detection of the bit synchronization signal, and also identifies the data following the frame synchronization signal as the identification number detection circuit 73. Output to.

  The identification number detection circuit 73 detects data representing the identification number, notifies the CPU 40 of the identification number, and outputs subsequent data to the repetition number detection circuit 74. The repetition number detection circuit 74 detects data representing the repetition number, notifies the CPU 40 of the repetition number, and outputs subsequent data to the switching circuit 75. As a result, the header including the bit synchronization signal, the frame synchronization signal, the data representing the identification number, and the data representing the number of repetitions is removed from the head of the received data.

  The switching circuit 75 returns the data output from the repetition number detection circuit 74 to the bit synchronization signal detection circuit 71 as many times as necessary, thereby obtaining information data from which a set number of headers have been removed. Thereafter, the switching circuit 75 outputs the information data thus obtained to the CPU 40. The CPU 40 reproduces various information transmitted from the wireless transmission device by decoding the information data and performing error correction.

  FIG. 4 is a diagram for explaining the intermittent operation of the wireless reception device shown in FIG. As shown in FIG. 4, the wireless reception device A normally performs an intermittent reception operation at a constant cycle including a reception operation period T1 and a reception standby period T2. Similarly, the wireless reception device B normally performs an intermittent reception operation at a constant cycle including the reception operation period T6 and the reception standby period T7. Further, the period of the intermittent reception operation differs depending on each wireless reception device and does not necessarily match.

  The wireless reception device A detects a carrier transmitted from the wireless transmission device in the reception operation period T1. Since the wireless transmission device does not transmit transmission information in the reception operation period T1, the wireless reception device A cannot detect a carrier in the reception operation period T1. Therefore, the wireless reception device A stops the reception operation and waits in the reception standby period T2.

  After the elapse of the reception standby period T2, the wireless reception device A starts the reception operation again, and detects the carrier transmitted from the wireless transmission device in the reception operation period T3. At this time, as shown in FIG. 4, since the wireless transmission device transmits transmission information to the wireless reception device A, the wireless reception device A detects a carrier transmitted from the wireless transmission device in the reception operation period T3. can do. Therefore, the wireless reception device A detects the identification number included in the reception data by demodulating the reception signal in the reception operation period T3.

  When the wireless reception device A confirms that the detected identification number matches the identification number assigned to the wireless reception device A, the wireless reception device A continuously receives the transmission information after the identification number. The wireless reception device A performs the intermittent reception operation again in the reception operation periods T4 and T5 after the reception of the series of transmission information is completed.

  Since the wireless reception device B cannot detect the carrier transmitted from the wireless transmission device in the reception operation period T6, the wireless reception device B stops the reception operation and waits in the reception standby period T7. After the elapse of the reception standby period T7, in the reception operation period T8, the wireless reception device B again detects a carrier transmitted from the wireless transmission device. At this time, since the wireless transmission device is transmitting the transmission information, the wireless reception device B can detect the carrier transmitted from the wireless transmission device in the reception operation period T8. Accordingly, the wireless reception device B detects the identification number included in the transmission information by demodulating the reception signal in the reception operation period T8.

  However, since the transmission information transmitted from the wireless transmission device is directed to the wireless reception device A, the wireless reception device B has an identification number assigned to the wireless reception device B and the detected identification number. Make sure they do not match. Further, the wireless reception device B detects the number of repetitions included in the transmission information following the identification number.

  Hereinafter, a case where the number of headers included in the header string in the transmission data transmitted from the wireless transmission device is five will be described. In this case, transmission data is composed of headers 1 to 5 and information data, and the wireless transmission device transmits header 5, header 4, header 3, header 2, header 1, and information data in this order. The number of repetitions included in the header 5 is 5, the number of repetitions included in the header 4 is 4, and similarly, the number of repetitions included in the header 1 is 1.

  Since the wireless reception device B knows that the header is repeated four more times when the number of repetitions detected in the reception operation period T8 is 5, the reception operation is performed in the period in which the header is repeated four times (reception standby period T9). Can be stopped. For this purpose, the memory 50 shown in FIG. 3 stores a table representing the correspondence between the number of repetitions and the reception standby period.

  Conventionally, since the wireless reception device B performs an intermittent reception operation, the reception signal is demodulated when a carrier is detected by performing the intermittent reception operation at a constant period even in the reception operation periods T10 to T12 indicated by broken lines. ID number was detected. On the other hand, in this embodiment, since the information on the number of repetitions is included in the transmission information transmitted from the wireless transmission device, the wireless reception device B determines that the transmission information is not directed to the wireless reception device B. In this case, the intermittent reception operation can be stopped during a period in which a series of transmission information is transmitted. Thereby, the power consumption in the radio | wireless receiver B is reduced, and when the radio | wireless receiver B is a battery drive, a battery life can be lengthened.

  Note that even if the number of headers included in the transmission data is 5, the number of repetitions detected by the wireless reception device B in the reception operation period T8 is not necessarily five. For example, when the wireless receiver B detects 3 as the number of repetitions, it can be seen that the header is repeated two more times, so that the intermittent reception operation can be stopped during the period in which the header is repeated twice.

FIG. 5 is a flowchart showing the operation of the wireless reception apparatus shown in FIG.
In step S <b> 10, the wireless reception device 200 intermittently receives the transmission information transmitted from the wireless transmission device, and the reception circuit 60 outputs the reception data obtained by demodulating the reception signal to the bit synchronization signal detection circuit 71. To do.

  When detecting the bit synchronization signal included in the received data, the bit synchronization signal detection circuit 71 notifies the CPU 40 of the detection of the bit synchronization signal. Further, when the frame synchronization signal detection circuit 72 detects the frame synchronization signal included in the received data, the frame synchronization signal detection circuit 72 notifies the CPU 40 of the detection of the frame synchronization signal. Further, when the identification number detection circuit 73 detects the identification number included in the received data, it notifies the CPU 40 of the identification number.

  In step S11, the CPU 40 determines whether bit synchronization has been established. If the CPU 40 determines that the bit synchronization is established, the process proceeds to step S12. If the CPU 40 determines that the bit synchronization is not established, the process returns to step S10.

  In step S12, the CPU 40 determines whether or not frame synchronization has been established. If the CPU 40 determines that the frame synchronization is established, the process proceeds to step S13. If the CPU 40 determines that the frame synchronization is not established, the process returns to step S10.

  In step S <b> 13, the CPU 40 determines whether or not the identification number detected by the identification number detection circuit 73 matches the identification number assigned to the wireless reception device 200. If the CPU 40 determines that the two identification numbers match, the process proceeds to step S14. If the CPU 40 determines that the two identification numbers do not match, the process proceeds to step S15.

  In step S14, the CPU 40 determines that the transmission information transmitted from the wireless transmission device is directed to the wireless reception device 200, and controls each unit to continue the reception operation. The repetition number detection circuit 74 detects the number of repetitions included in the received data. When the number of repetitions is not 1, the switching circuit 75 returns the data following the number of repetitions to the bit synchronization signal detection circuit 71. When the number of repetitions becomes 1, the data following the number of repetitions is sent to the CPU 40 as information data. Output. When the CPU 40 obtains the information data, the CPU 40 performs processing according to various types of information included in the information data. When the process ends, the wireless reception device 200 starts the intermittent reception operation again in step S10.

  If the identification number detected by the identification number detection circuit 73 does not match the identification number assigned to the wireless reception device 200, the repetition number detection circuit 74 determines the repetition number included in the received data in step S15. To detect. The repetition number detection circuit 74 notifies the CPU 40 of the detected number of repetitions.

  In step S <b> 16, the CPU 40 refers to the table indicating the correspondence relationship between the number of repetitions stored in the memory 50 and the reception waiting period based on the number of repetitions notified from the repetition number detection circuit 74, and sets the number of repetitions. The reception standby period is determined by reading the corresponding reception standby period. For example, in this table, reception waiting periods of 5 seconds, 4.5 seconds,..., 0.5 seconds are stored corresponding to the number of repetitions 10, 9,.

  In step S <b> 17, the CPU 40 controls each unit so as to stop the intermittent reception operation of the wireless reception device 200 during the reception standby period. In step S18, the CPU 40 measures the period during which the intermittent reception operation is stopped using a timer function or the like, and when the reception standby period has elapsed, returns the processing to step S10 again and starts the intermittent reception operation. Control each part.

  1 and 3, the signal processing circuits 30 and 70 are configured outside the CPU 40, but the functions of the signal processing circuits 30 and 70 may be realized by the CPU 40 and software. In that case, the software is stored in the memory 50. As a result, the repetition number generation circuit 31 and the repetition number detection circuit 74, which are features of the present embodiment, are configured as internal functions of the CPU 40, and there is an advantage that it is not necessary to change conventional hardware.

Next, a radio transmission / reception apparatus according to the third embodiment of the present invention will be described.
FIG. 6 is a block diagram showing a configuration of a wireless transmission / reception apparatus according to the third embodiment of the present invention. The wireless transmission / reception apparatus according to the present embodiment is used as a parent device in a wireless network system, for example, and performs wireless communication with the child device 400 shown in FIG. A wireless transmission / reception apparatus (hereinafter also referred to as “master unit”) 300 includes an antenna 10, a transmission / reception circuit 80, signal processing circuits 30 and 110, a CPU 40, a memory 50, and an external interface 90.

  The transmission / reception circuit 80 functions in the same manner as the transmission circuit 20 shown in FIG. 1 or the reception circuit 60 shown in FIG. 3 depending on whether the parent device transmits radio waves to the child device or receives radio waves from the child device. . The signal processing circuit 110 includes a bit synchronization signal detection circuit 71, a frame synchronization signal detection circuit 72, and an identification number detection circuit 73. Normally, the master unit 300 to which a transmission signal is transmitted from the slave unit is determined as a single unit, and the master unit 300 does not perform the intermittent reception operation unlike the slave unit 400 shown in FIG. The repetition number detection circuit 74 and the switching circuit 75 are omitted.

  As shown in FIG. 6, the CPU 40 is connected to a server 310 that manages the entire wireless network system via an external interface 90. The server 310 includes information regarding the number of slave units existing in the area of the master unit 300, information regarding the operating state of the slave units in the wireless network system and the period of the intermittent reception operation, and necessary for operating the wireless network system. Information is centrally managed.

  The base unit 300 can collect data from the server 310 and store it in the memory 50 as necessary. For example, the parent device 300 acquires instruction information for the child device from the server 310 and stores it in the memory 50, and extracts the instruction information from the memory 50 and transmits it to the child device 400 as necessary. Further, data transmitted from the slave unit to the master unit 300 is transferred to the server 310.

Next, a radio transmission / reception apparatus according to the fourth embodiment of the present invention will be described.
FIG. 7 is a block diagram showing a configuration of a wireless transmission / reception apparatus according to the fourth embodiment of the present invention. The wireless transmission / reception apparatus according to the present embodiment is used as a slave unit in a wireless network system, for example, and performs wireless communication with the base unit 300 shown in FIG. In the wireless transmission / reception apparatus (hereinafter also referred to as “child device”) 400 illustrated in FIG. 7, the CPU 40 is connected to a sensor 410 that senses temperature and the like via an external interface 90.

  The transmission / reception circuit 80 functions in the same manner as the transmission circuit 20 shown in FIG. 1 or the reception circuit 60 shown in FIG. 3 depending on whether the slave unit transmits radio waves to the master unit or receives radio waves from the master unit. . The signal processing circuit 120 includes an identification number generation circuit 32, a frame synchronization signal generation circuit 33, and a bit synchronization signal generation circuit 34. Usually, the master unit to which the transmission signal is transmitted from the slave unit 400 is determined as a single unit, and the master unit does not perform the intermittent reception operation unlike the slave unit 400. Therefore, in the signal processing circuit 120, the repetition number generation circuit 31 The switching circuit 35 is omitted.

  The sensor 410 is, for example, a temperature sensor installed in an air conditioner installed indoors. When slave device 400 receives transmission information including an instruction to acquire temperature information of sensor 410 from the parent device, CPU 40 controls sensor 410 to acquire temperature information in accordance with the instruction to acquire temperature information. Furthermore, the subunit | mobile_unit 400 transmits the acquired temperature information with respect to a main | base station.

  6 and 7, the signal processing circuits 30 and 110 or the signal processing circuits 70 and 120 are configured outside the CPU 40. However, the signal processing circuits 30 and 110 or the signal processing circuits 70 and 120 The function may be realized by the CPU 40 and software. In that case, the software is stored in the memory 50.

  FIG. 8 is a diagram illustrating a wireless network system including a parent device and a plurality of child devices. As described above, the wireless network system is configured by the parent device 300 that generates transmission data including repetition information and the plurality of child devices 400 that can stop the intermittent reception operation by the repetition information. This wireless network system has a great effect when a plurality of slave units have different periods of intermittent reception operations.

  For example, when a slave unit A having an intermittent reception operation period of 1 hour and a slave unit B having an intermittent reception operation period of 1 second are mixed in the same master unit area, the master unit is directed to the slave unit B. When the transmission information is transmitted, since the handset A has almost no reception operation period in the transmission period of the transmission information, the power consumption is not a problem.

  However, when the transmission information is transmitted from the parent device to the child device A, the child device B has a large number of intermittent receptions during the transmission period of the transmission information, and the intermittent reception operation is performed by the data addressed to the child device B. Therefore, it can be said that extra power is consumed for the slave unit B.

  According to the present embodiment, since the repetition number of the header is transmitted from the parent device, the intermittent reception operation can be stopped in the child device B during that time. Thereby, the power consumption in the subunit | mobile_unit B is reduced, and when the subunit | mobile_unit B is a battery drive, a battery life can be lengthened.

1 is a block diagram showing a configuration of a wireless transmission device according to a first embodiment of the present invention. The figure which shows the frame structure of the transmission data produced | generated with the radio | wireless transmitter shown in FIG. The block diagram which shows the structure of the radio | wireless receiver which concerns on the 2nd Embodiment of this invention. The figure for demonstrating the intermittent operation | movement of the radio | wireless receiver shown in FIG. FIG. 4 is a flowchart showing the operation of the wireless reception device shown in FIG. 3. FIG. The block diagram which shows the structure of the radio | wireless transmitter / receiver which concerns on the 3rd Embodiment of this invention. The block diagram which shows the structure of the radio | wireless transmitter / receiver which concerns on the 4th Embodiment of this invention. The figure which shows the radio | wireless network system comprised with a main | base station and a some subunit | mobile_unit.

Explanation of symbols

  10 antenna, 20 transmission circuit, 30, 70, 110, 120 signal processing circuit, 31 repetition number generation circuit, 32 identification number generation circuit, 33 frame synchronization signal generation circuit, 34 bit synchronization signal generation circuit, 35 switching circuit, 40 CPU 50 memory, 60 reception circuit, 71 bit synchronization signal detection circuit, 72 frame synchronization signal detection circuit, 73 identification number detection circuit, 74 repetition number detection circuit, 75 switching circuit, 80 transmission / reception circuit, 90 external interface, 100 wireless transmission device , 200 wireless reception device, 300 wireless transmission / reception device (parent device), 310 server, 400 wireless transmission / reception device (child device), 410 sensor

Claims (6)

A wireless transmission device,
Signal processing means for generating transmission data, including identification information of the transmission destination and the number of repetitions of the header in the information data to be transmitted, adding a predetermined number of headers for the transmission destination,
A transmission circuit that generates a transmission signal by modulating a carrier wave based on transmission data generated by the signal processing means;
An antenna for transmitting a radio wave supplied with a transmission signal generated by the transmission circuit;
A wireless transmission device comprising: Storage means for storing identification information of a plurality of destinations;
Control means for reading identification information of a desired destination from the storage means and supplying the identification information to the signal processing means;
The wireless transmission device according to claim 1, further comprising: A wireless receiver,
An antenna that receives radio waves and generates a received signal;
A reception circuit that generates reception data by amplifying and demodulating the reception signal generated by the antenna; and
In the header included in the reception data generated by the reception circuit, signal processing means for detecting the identification information of the transmission destination and the number of repetitions of the header;
When the transmission destination identification information detected by the signal processing means does not match the identification information assigned to the wireless reception device, the reception operation is performed in a period corresponding to the number of repetitions of the header detected by the signal processing means. Control means for stopping
A wireless receiver comprising:   The information processing apparatus further comprises storage means for storing information representing a correspondence relationship between the number of repetitions of the header and a period for stopping the reception operation, and the control means receives the data based on the number of repetitions of the header detected by the signal processing means. The radio reception apparatus according to claim 3, wherein information relating to a period during which operation is stopped is read from the storage unit. A wireless transceiver,
An antenna for transmitting and receiving radio waves,
During transmission, a transmission signal is generated by modulating a carrier wave based on transmission data and supplied to the antenna. During reception, reception data is generated by amplifying and demodulating the reception signal generated by the antenna. A transceiver circuit;
The information data to be transmitted includes the identification information of the transmission destination and the number of repetitions of the header, adds a predetermined number of headers for the transmission destination, generates transmission data, and supplies the transmission data to the transmission / reception circuit Signal processing means;
A wireless transmission / reception apparatus comprising: A wireless transceiver,
An antenna for transmitting and receiving radio waves,
During transmission, a transmission signal is generated by modulating a carrier wave based on transmission data and supplied to the antenna. During reception, reception data is generated by amplifying and demodulating the reception signal generated by the antenna. A transceiver circuit;
In the header included in the reception data generated by the transmission / reception circuit, signal processing means for detecting the identification information of the transmission destination and the number of repetitions of the header;
When the transmission destination identification information detected by the signal processing means does not match the identification information assigned to the wireless transmission / reception apparatus, the reception operation is performed in a period corresponding to the number of repeated headers detected by the signal processing means. Control means for stopping
A wireless transmission / reception apparatus comprising:

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