JP5838374B2 - Wireless communication system - Google Patents

Description

  The present invention relates to a wireless communication system applicable to sensors.

  In recent years, for the purpose of effective use of frequency resources, a part of the frequency band of digital cordless telephones can be used for wireless communication of voice communication devices such as wireless doorphones and wireless sensors or data communication devices. This frequency band is approved for wireless communication based on the DECT (Digital Enhanced Cordless Communications) standard, which is widely used as a communication system for digital cordless telephones around the world. Wireless communication using this frequency band In the apparatus, it is possible to use an inexpensive wireless communication device that is commercially available for a DECT digital cordless telephone. In addition, there is a demand for the development of composite products such as digital cordless telephones, wireless door phones, and wireless sensors from the viewpoint of effective utilization of frequency resources and user convenience.

  The DECT method includes TDMA (Time Division Multiple Access) / TDD (Time Division) including 24 slots (12 slots for uplink and 12 slots for downlink) in one frame of 10 ms period. Duplex: Time Division Duplex) is adopted.

  FIG. 1 shows a DECT frame and slot configuration. As shown in FIG. 1, in DECT wireless communication, each slot for wireless communication is assigned a number such as Slot: 1 and Slot: 2, and control of the slot position for communication is performed. The frame is composed of 24 slots from Slot: 1 to Slot: 24, and communication control is performed by assigning a frame number to each frame. One slot is assigned as a control channel, and 11 slot pairs are assigned as call channels. The control signal transmitted through the DECT control channel includes a synchronization signal for synchronizing bit synchronization and slot timing, a parent device ID for identifying the parent device, and slot synchronization for use in specifying a communication slot. This is an error detection code for determining whether there is an error in the received data and control information including the frame number used for synchronization, the frame number used for concealment control, the frame number used for concealment control, etc. Composed.

  The control information transmitted through the control channel of the DECT system notifies the system information such as the NT message, the frame number, the base unit function, the communication frequency, the standby frequency, etc. for notifying the base unit ID which is the base unit identification information and the multi-frame. MAC layer such as QT message used as a reference frame for control, paging information, paging-related information such as caller ID information for caller ID notification, paging message, communication channel activation, handover, etc. Are classified into four types of MT messages for notifying information related to radio control. In the DECT cordless phone, instead of sending the contents information every time, a unit with 16 frames as one cycle is defined, and one type of message is sent in one unit to send control information to a plurality of pieces of information. It is distributed in frames. The slave station, which is a dependent station, performs intermittent reception control that performs a reception operation in accordance with a control slot in which control information is transmitted once every 16 frames. In this way, multi-frame control is performed in which control information is divided by type (NT message, QT message, PT message, MT message) and sent in a plurality of frames.

  Since these TDMA wireless communication apparatuses are used for battery-powered mobile communication and cordless telephones, many techniques for reducing power consumption have been disclosed. For example, Patent Document 1 discloses a battery saving method based on intermittent reception using control channel control with a spur frame configuration and variable control of an intermittent reception cycle.

  On the other hand, sensor devices used for fire alarms, window open / close monitoring devices, etc., have been developed to operate with batteries and have a wireless communication function for ease of installation, and to reduce power consumption. A number of techniques are disclosed. For example, in Patent Document 2, only when it is determined that wireless communication is necessary from the sensor device, power is supplied to the wireless unit and communication is performed to reduce power consumption. Also, wireless communication is performed by controlling the transmission interval and the number of times. A technique for improving the reliability of the system is disclosed.

Japanese Patent Laid-Open No. 5-102900 JP 2005-84803 A

  When the sensor device is constructed by applying wireless communication using the TDMA method, when the battery saving is performed by the intermittent reception control in the standby state, that is, the wireless communication from the sensor device is unnecessary, the power supply of the wireless unit in the standby state Compared to existing wireless sensors that stop the operation, there is a problem that the power consumption increases.

  In addition, when trying to construct a wireless sensor device and a wireless doorphone that performs voice call or image communication, etc. with a common base unit (control station), a terminal that performs voice call or image communication has a surplus power source. However, since the wireless sensor device is premised on notifying a small amount of information such as abnormality detection, it is necessary to reduce power consumption as much as possible. A terminal that performs image communication or the like can maintain synchronization with the control station while constantly receiving a control signal from the control station, but if the wireless sensor device processes the control signal from the control station in the same manner, power consumption increases, The battery needs to be replaced frequently. Therefore, when a wireless sensor device and a terminal that performs other voice / image communication or the like coexist with a common base unit (control station), communication using different wireless communication methods is required, and the wireless circuit becomes complicated. Had.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a wireless communication apparatus that can be applied to a wireless sensor using the TDMA system and has low power consumption and is resistant to interference caused by wireless interference.

  The radio communication apparatus according to the present invention includes a control station and a dependent station that perform time division multiplex communication. The dependent station receives a control signal transmitted by the control station, and broadcasts it using a control signal reception timing and a control signal. A wireless communication apparatus that performs time division multiplex communication with a control station based on control data, wherein the control station includes a wireless means for performing wireless communication and a frame for constructing a transmission data sequence in a predetermined format When the processing means and one slot are divided into a plurality of areas and the slave station transmits information necessary for communication in each area, and the same information is transmitted in different slots, the same information is And a control means for controlling the area in the slot to be transmitted to be transmitted in an area different from the area in the slot that was previously transmitted. Frame processing means for independently retrieving a plurality of pieces of information sent in the same slot from the data string, and communication with the control station based on information sent in a plurality of areas in the same slot It is characterized by comprising a control means for controlling such that.

  According to the present invention, since the dependent station can perform the TDMA synchronization with the control station at high speed and more reliably, the power consumption when establishing the synchronization of the control station can be reduced, and the reliability of the wireless communication can be improved. Can be improved.

The figure which shows the frame and slot structure in a DECT system The figure which shows the radio | wireless communication apparatus which concerns on Embodiment 1 of this invention. Block diagram showing the configuration of the base unit shown in FIG. The block diagram which shows the structure of the telephone cordless handset shown in FIG. The block diagram which shows the structure of the sensor subunit | mobile_unit shown in FIG. The figure which shows the data format of a control signal in case only the telephone cordless handset is registered into the main | base station shown in FIG. The figure which shows the data format of a control signal when the sensor subunit | mobile_unit is registered into the parent | base station shown in FIG. The figure which showed the kind and transmission order of the control signal transmitted when only the telephone cordless handset is registered in the main | base station shown in FIG. The figure which shows the data format of the signal used when the main | base station shown in FIG. 2 and a telephone cordless handset communicate The figure which shows the operation | movement which the telephone subunit | mobile_unit shown in FIG. 2 establishes a frame | frame and a slot synchronization with a main | base station. The figure which showed the kind and transmission order of the control signal transmitted when the sensor subunit | mobile_unit is registered into the main | base station shown in FIG. The figure which shows the operation | movement which the sensor subunit | mobile_unit shown in FIG. 2 establishes a synchronization with a main | base station, a flame | frame, and a slot The figure which shows the operation | movement which the sensor subunit | mobile_unit shown in FIG. 2 establishes a synchronization with a main | base station, a flame | frame, and a slot when control data 3, control data 4, and control data 5 cannot be received The figure which shows the data format of the signal used when the main | base station shown in FIG. 2 and a sensor subunit | mobile_unit communicate. The figure which shows the example of the operation | movement which establishes a synchronization with a main | base station and the window state of a sensor subunit | mobile_unit shown in FIG.

  1st invention of this application is comprised by the control station and subordinate station which perform time division multiplexing communication, and a subordinate station receives the control signal which a control station transmits, and alert | reports by the reception timing and control signal of a control signal A wireless communication apparatus that performs time division multiplex communication with a control station based on control data, wherein the control station includes wireless means for performing wireless communication, and frame processing means for constructing a transmission data sequence in a predetermined format. When one slot is divided into a plurality of areas and information necessary for the slave station to perform communication in each area is transmitted and the same information is transmitted in different slots, the same information is transmitted in the slot. And a control means for controlling to transmit in a different area from the previously transmitted slot, and the subordinate station and the wireless means for performing wireless communication and the same slot from the received data string. A frame processing means for independently extracting a plurality of information sent in the network, and a control means for controlling communication with the control station based on the information sent in a plurality of areas in the same slot. A wireless communication apparatus characterized by comprising the wireless communication apparatus.

  According to the first invention, one slot is divided into a plurality of areas, and in each area, the dependent station establishes synchronization with the control station, and information necessary for starting communication is transmitted. Is transmitted in an area other than the previously transmitted area, even if there is a continuous reception error in a part of the slot that receives the control signal, the information transmitted in multiple slots By receiving this, it becomes possible to receive all information necessary for communication, shortening the time for establishing synchronization with the control station, reducing power consumption, and improving communication reliability. In particular, when the same TDMA wireless device operating in the same cycle is operating in the vicinity, each device operates asynchronously, so the communication timing of the device changes with time. Each transmission timing approaches gradually, and eventually, the start portion of one slot overlaps the end portion of the other slot, and a reception error occurs in the overlap portion. Since the start portion of the slot is a synchronization signal composed of a bit synchronization pattern, interference occurs in this portion, and even if a reception error occurs, other data received in the slot is discarded. There is no. On the other hand, the end portion of the slot is an error detection code. When a reception error occurs in this portion, the reception data in the reception data area corresponding to the error detection code that has caused the reception error is discarded. This phenomenon causes a serious problem that communication between the control station and the subordinate station becomes impossible when radio interference occurs in the error detection code at the end of the control signal transmitted by the control station. become. In the present invention, even in such a case, the information necessary for starting communication is divided into a plurality of slots, and a reception error occurs continuously at the end of the slot. However, only the information transmitted in the last area of the divided areas is discarded, and even if the state where the last area of the divided areas cannot be received continues, Can be received, communication between the control station and the subordinate station is possible, and an increase in power consumption due to a retry due to communication failure can be reduced and communication reliability can be improved.

  According to a second invention of the present application, in the first invention, the control means of the control station transmits a plurality of predetermined specific data among the control data notified by the control signal in the same area of the plurality of slots. The wireless communication apparatus is characterized by being controlled as described above.

  According to the second invention, since a plurality of specific data is transmitted in the same area of a plurality of slots, information necessary if only a specific one area in one slot can be received can be maintained. Therefore, in the environment where a reception error occurs, the frequency of occurrence of a communication failure due to the reception error can be reduced and the communication reliability can be improved.

  A third invention of the present application is the wireless communication apparatus according to the first invention, wherein the control means of the control station controls to transmit the same control data in a plurality of areas in the same slot. is there.

  According to the third aspect, since the same data is transmitted in a plurality of areas in the same slot, even if a reception error occurs in a part of the area in the slot, the same data is transmitted. If other areas in the slot can be received normally, information that needs to be received in one slot can be acquired correctly, so the time required to acquire all the data necessary for communication in an environment where a reception error occurs is reduced. An increase in power consumption can be reduced.

  In a fourth invention of the present application, in the third invention, when the control means of the control station controls to transmit the same control data in a plurality of areas in the same slot, the same data is not adjacent to the area. It is the radio | wireless communication apparatus characterized by controlling to transmit by.

  According to the fourth aspect, since the same control data transmitted in the same slot is transmitted in a non-adjacent area, when a reception error occurs in a continuous area in the slot, This reduces the probability that all the same data transmitted in the same area overlaps the area where the reception error occurs, so the time required to acquire all the data necessary for communication in the environment where the reception error occurs is shortened and consumed. An increase in power can be reduced.

  According to a fifth invention of the present application, in any one of the first to fourth inventions, the dependent station detects a predetermined state, a power supply to the wireless means, the frame processing means, and the control means. Power supply control means for turning on and off the supply, and when a predetermined state is detected, supplies power to the radio means, the frame processing means, and the control means, receives a control signal transmitted from the control station, and receives the control signal Is a wireless communication apparatus that establishes synchronization of time-division multiplex communication with and notifies the control station of the state detected by the sensor means.

  According to the fifth invention, when the predetermined state is detected by the sensor means, power is supplied to the wireless means, the frame processing means and the control means to start the wireless communication, so no communication is required. It is possible to reduce power consumption during standby.

  According to a sixth invention of the present application, in the fifth invention, the sensor means of the subordinate station operates to detect the state notified from the control means, and the control means informs the control station of the state detected by the sensor means. A wireless communication apparatus characterized in that after the notification, the sensor means notifies the sensor means of the next detection state, and controls the power supply control means to turn off the power supply to the wireless means, the frame processing means, and the control means. It is.

  According to the sixth invention, the state detected by the sensor means can be specified from the control unit, and the control unit notifies the sensor unit of the next state detected by the sensor means, and the power is turned off. The degree of power consumption can be increased, and power consumption until the state is detected by the sensor means can be reduced.

  A seventh invention of the present application includes a control station that performs time division multiplex communication, a first dependent station, and a second dependent station, and the first dependent station and the second dependent station are transmitted by the control station. A period in which the control signal is received, time-division multiplexing communication with the control station is performed based on the reception timing of the control signal and the control data notified by the control signal, and the first dependent station does not need to transmit to the control station Operates to maintain the synchronization of the time division multiplex communication with the control station by receiving the control signal transmitted by the control station at a predetermined cycle, and the second subordinate station transmits the control signal to the control station. A wireless communication device that operates to stop receiving control signals transmitted by a control station during an unnecessary period. The control station constructs a transmission data string in a predetermined format with wireless means for performing wireless communication. Frame processing means for performing And the first dependent station transmits information for synchronizing the time-division multiplex communication and maintaining the synchronization in the first region of the plurality of regions, and the second region in the region excluding the first region of the plurality of regions. The subordinate station transmits information necessary for synchronizing the time division multiplex communication and communicating with the control station, and the second subordinate station synchronizes the time division multiplex communication in a different slot and communicates with the control station. Control means for controlling so that the area in the slot for transmitting the same information is transmitted in an area different from the area in the previously transmitted slot when transmitting the same information necessary for performing The subordinate station is transmitted in a plurality of areas in the same slot, a wireless means for performing wireless communication, a frame processing means for independently extracting a plurality of pieces of information transmitted in the same slot from the received data string, respectively. Control based on information Further comprising a control means for controlling to perform communication with a radio communication apparatus according to claim.

  According to the seventh invention, one slot is divided into a plurality of areas, and the first subordinate station synchronizes time division multiplex communication and transmits information for maintaining synchronization in the head area of the plurality of areas. The second subordinate station transmits information necessary for synchronizing with the control station by synchronizing the time division multiplex communication in the areas other than the head area of the plurality of areas. The information necessary for establishing synchronization with the control station and starting communication is transmitted, and when the same information is transmitted in different slots, it is transmitted in an area other than the previously transmitted area. Dependent stations can receive all the information necessary for communication by receiving information transmitted in multiple slots, even if reception errors occur continuously in some slots that receive control signals. The time for establishing synchronization with the control station Shortened, power consumption can be reduced, wear is possible to improve the reliability of communication. In particular, when the same TDMA wireless device operating in the same cycle is operating in the vicinity, each device operates asynchronously, so the communication timing of the device changes with time. Each transmission timing approaches gradually, and eventually, the start portion of one slot overlaps the end portion of the other slot, and a reception error occurs in the overlap portion. Since the start portion of the slot is a synchronization signal composed of a bit synchronization pattern, interference occurs in this portion, and even if a reception error occurs, other data received in the slot is discarded. There is no. On the other hand, the end portion of the slot is an error detection code. When a reception error occurs in this portion, the reception data in the reception data area corresponding to the error detection code that has caused the reception error is discarded. This phenomenon causes a serious problem that communication between the control station and the subordinate station becomes impossible when radio interference occurs in the error detection code at the end of the control signal transmitted by the control station. become. In the present invention, even in such a case, the information necessary for starting communication is divided into a plurality of slots, and a reception error occurs continuously at the end of the slot. However, only the information transmitted in the last area of the divided areas is discarded, and even if the state where the last area of the divided areas cannot be received continues, Can be received, communication between the control station and the subordinate station is possible, and an increase in power consumption due to a retry due to communication failure can be reduced and communication reliability can be improved. In addition, since the control station can multiplex and transmit information for maintaining the synchronization by synchronizing the time division multiplex communication of both the first dependent station and the second dependent station in one slot, Accordingly, it is possible to provide a wireless communication apparatus that accommodates dependent stations with different directions. For example, the first subordinate station can be configured as a cordless telephone cordless handset, and the second subordinate station can be configured as a radio sensor, and the cost of the radio communication apparatus can be reduced by simplifying the radio circuit of the control unit. Effective utilization of frequency resources becomes possible.

  According to an eighth aspect of the present invention, in the seventh aspect, the control station transmits information for identifying the control station in a head area of the plurality of areas, and the second subordinate station is a head area of the plurality of areas. The wireless communication apparatus is characterized in that it operates to select a received control station based on information identifying the control station transmitted in (1).

  According to the eighth invention, the control station transmits information for identifying the control station in the head area of the plurality of areas, and the second dependent station operates to select the received control station based on the information. Since the second dependent station starts synchronization with the control station in an environment where a plurality of control stations are received, a reception period for selecting the control station for selecting the control station of the own station And power consumption is reduced.

  According to a ninth invention of the present application, in the seventh invention or the eighth invention, the control means of the control station notifies the control station that the second subordinate station that is notified by the control signal synchronizes with the control station. The wireless communication apparatus is characterized in that control is performed so that a plurality of specific data necessary for performing the communication is transmitted in the same area of a plurality of slots.

  According to the ninth aspect, since a plurality of specific data is transmitted in the same area of a plurality of slots, information necessary if only a specific one area in one slot can be received can be continued. Therefore, in the environment where a reception error occurs, the frequency of occurrence of a communication failure due to the reception error can be reduced and the communication reliability can be improved.

  According to a tenth aspect of the present invention, in the seventh or eighth aspect, the control means of the control station allows the second subordinate station to communicate with the control station in synchronization with time division multiplex communication. The wireless communication apparatus is characterized in that the same control data necessary for transmission is controlled to be transmitted in a plurality of areas in the same slot.

  According to the tenth aspect, since the same data is transmitted in a plurality of areas in the same slot, even if a reception error occurs in a part of the area in the slot, the same data is transmitted. If other areas in the slot can be received normally, information that needs to be received in one slot can be acquired correctly, so the time required to acquire all the data necessary for communication in an environment where a reception error occurs is reduced. An increase in power consumption can be reduced.

  In an eleventh aspect of the present invention, in the tenth aspect, when the control means of the control station controls to transmit the same control data in a plurality of areas in the same slot, the same data is not adjacent to the area. It is the radio | wireless communication apparatus characterized by controlling to transmit by.

  According to the eleventh aspect, since the same control data transmitted in the same slot is transmitted in a non-adjacent area, when a reception error occurs in a continuous area in the slot, The probability that all the same data transmitted in the same area overlaps the area where the reception error occurs can be reduced, so the time required to acquire all the data necessary for communication in the environment where the reception error occurs is shortened and consumed. An increase in power can be reduced.

  According to a twelfth aspect of the present invention, in any one of the seventh to eleventh aspects, the second dependent station detects sensor means, the wireless means, the frame processing means, and the control that detect a predetermined state. Power supply control means for turning on / off power supply to the means, and supplies power to the wireless means, the frame processing means, and the control means when a predetermined state is detected, and is transmitted from the control station A wireless communication apparatus characterized by receiving a control signal, establishing synchronization of time division multiplex communication with a control station, and notifying the control station of a state detected by the sensor means.

  According to the twelfth invention, when the predetermined state is detected by the sensor means, power is supplied to the wireless means, the frame processing means, and the control means to start the wireless communication, so no communication is required. It is possible to reduce power consumption during standby.

  According to a thirteenth aspect of the present invention, in the twelfth aspect, the sensor means of the second subordinate station operates so as to detect the state notified from the control means, and the control means detects the state detected by the sensor means. After notifying the control station, the sensor means notifies the sensor means of the next detection state, and the power control means is controlled to turn off the power supply to the radio means, the frame processing means, and the control means. A wireless communication device.

  According to the thirteenth aspect, the state detected by the sensor means can be designated by the control unit, and the control unit notifies the sensor unit of the next state detected by the sensor means, and the power is turned off. The degree of power consumption can be increased, and power consumption until the state is detected by the sensor means can be reduced.

  According to a fourteenth aspect of the present invention, in the twelfth aspect or the thirteenth aspect, the state in which the control means of the control station is detected by the sensor means notified from the second dependent station is the first dependent state. The station is informed by a control signal transmitted at a transmission timing of a control signal received at a predetermined cycle in order to maintain synchronization of time division multiplex communication, and is notified to the first dependent station. Wireless communication device.

  According to the fourteenth aspect, the first dependent station receives the state detected by the sensor means notified from the second dependent station at a predetermined period in order to maintain the synchronization of the time division multiplex communication. Since the control signal transmitted at the transmission timing of the control signal is notified, the state detected by the sensor means can be notified to the first subordinate station in the standby state, and convenience is improved. For example, when the first dependent station is a cordless telephone slave unit and the second dependent station is a wireless sensor, the cordless telephone slave unit can be notified of the status of the wireless sensor with easy control. It becomes.

  In a fifteenth aspect of the present invention, in any one of the seventh to fourteenth aspects, the control means of the control station divides one slot into a plurality of areas when the second dependent station is not registered, The first subordinate station synchronizes the time division multiplex communication in the head area of the plurality of areas and transmits information for maintaining the synchronization, and does not perform transmission in the areas other than the head area of the plurality of areas. The wireless communication apparatus is characterized by being controlled as described above.

  According to the fifteenth invention, when the second dependent station is unregistered, transmission in the area other than the head area of the plurality of areas is not performed, so that power consumption in the control station can be reduced, Consumption of useless radio resources can be suppressed.

(Embodiment 1)
A wireless communication apparatus according to Embodiment 1 of the present invention will be described with reference to the drawings, taking a cordless telephone and a door open / close notification wireless sensor as examples.

  FIG. 2 shows a wireless communication apparatus according to Embodiment 1 of the present invention. In FIG. 2, the wireless communication device 10 functions as a sensor such as one base unit 20 connected to the telephone line network 50, three telephone handset units 30 (A to C), and window opening / closing detection. It has a sensor slave unit 40 (A to C). The master unit 20, the telephone slave unit 30, and the sensor slave unit 40 communicate with each other using the DECT method. As shown in FIG. 1, the DECT system is communicated by a TDMA / TDD system configured by including 24 slots (12 slots for uplink and 12 slots for downlink) in one frame of 10 ms period. . Further, at least one control channel slot is allocated in one frame. Both the control channel and the communication channel are transmitted and received at a frame period of 10 ms. Further, each frequency / slot position is arbitrary, and a total of 5 frequencies are used.

  Next, the master unit 20 will be described with reference to FIG. The base unit 20 transmits a transmission data such as control data and voice data in accordance with the timing for TDMA communication, and extracts data from the received data in accordance with the timing of TDMA communication. The frame processing unit 202 includes an audio processing unit 203 that converts received audio data into an analog audio signal and converts the analog audio signal into digital audio data for transmission.

  Furthermore, the base unit 20 sets the first control data multiplexing unit 210 that manages the transmission order of control data to be transmitted in the first control data area of the control signal, and the transmission order of control data to be transmitted in the subsequent control data area. A second control data multiplex unit 211 to be managed is provided.

  Furthermore, the master unit 20 includes a ROM 220 that stores a program for controlling the master unit 20 and a RAM 221 for executing the program. In addition, the content of the main unit 20 does not disappear even when the power is turned off. The EEPROM 222 whose contents can be rewritten by a specific method, the display unit 223 for displaying the operation state and the like, and the operation unit 224 for inputting an operation instruction to the main unit 20. A control unit 230 that controls the entire base unit 20 is provided.

  Next, the telephone handset 30 will be described with reference to FIG. The telephone handset 30 transmits a transmission data such as control data and voice data in accordance with the timing for TDMA communication, and transmits data from the received data in accordance with the timing of TDMA communication. The extracted frame processing unit 302 includes an audio processing unit 303 that converts received audio data into an analog audio signal and converts the analog audio signal into digital audio data for transmission.

  Furthermore, the telephone handset 30 includes a control data multiplexing unit 310 that manages the transmission order of control data to be transmitted in the first control data area of the control signal, a ROM 320 that contains a control program, and a program for executing the program. A RAM 321 is provided. Further, the contents are not erased even when the power is turned off. The EEPROM 322 whose contents can be rewritten by a specific method, the display unit 223 for displaying the operation state, the operation unit 324 for instructing the operation, and the telephone handset 30 as a whole are controlled. A control unit 330 is provided. In addition, although the telephone subunit | mobile_unit 30 is driven with the battery which can be charged, it has abbreviate | omitted about the functional block for supplying the electric power from a battery or a battery.

  Next, the sensor slave unit 40 will be described with reference to FIG. The sensor slave unit 40 transmits the transmission data such as control data and sensor detection to the master unit 20 in accordance with the timing for TDMA communication and receives from the master unit 20 with the wireless unit 401 that performs DECT wireless communication. A frame processing unit 402 is provided that extracts data from received data in accordance with the timing of TDMA communication. The sensor slave unit 40 further includes a first control data multiplexing unit 410 that manages the transmission order of control data to be transmitted in the first control data area of the control signal, and the transmission order of control data to be transmitted in the subsequent control data area. A second control data multiplexing unit 411 for management is provided.

  Furthermore, the sensor slave unit 40 includes a ROM 420 containing a control program, a RAM 421 for executing the program, an EEPROM 422 whose contents are not erased even when the power is turned off, and whose contents can be rewritten by a specific method, and the entire sensor slave unit 40 The control part 330 which performs control of this is provided.

  For the sensor slave unit 40, the wireless unit 401, the frame processing unit 402, the first control data multiplexing unit 410, the second control data multiplexing unit 411, the ROM 420, the RAM 421, the EEPROM 422, and the control unit 330 described above. The constructed block will be called a communication block 400.

  The sensor slave unit 40 also includes a switch 440 for turning on / off the power supply to the communication block 400, a power control unit 441 for generating a power control switching signal, a timer unit 442 for measuring the power on timing, and opening / closing of the window. A sensor unit 443 that detects and generates a power-on signal, and a power source unit 444 that supplies power to each unit of the sensor slave unit 40 by battery power.

  Next, the operation of radio communication apparatus 10 according to the first embodiment will be described. When radio communication apparatus 10 is in an idle state, base unit 20 controls one of the transmission slots of the control station from Slot: 1 to Slot: 12 in one frame (time width: 10 msec) shown in FIG. It is used as a channel and transmits a control signal every 10 msec. A message to be sent from the parent device to each telephone child device such as a call message is placed on the control signal. In the idle state, the telephone handset 30 performs a receiving operation in a slot in which the control station transmits a control signal, and receives a message sent from the parent machine 20 to the telephone handset 30 by the control signal. In the idle state, the power supply to the wireless block 400 is turned off and the sensor slave unit 40 does not receive a control signal for each frame. However, the sensor unit 443 operates even in an idle state, and generates a power-on signal when a change in the state of the window is detected.

  FIG. 6 shows a format of a control signal transmitted by the master unit 20 when only the telephone slave unit 30 is registered in the master unit 20. FIG. 7 shows a format of a control signal transmitted by the master unit 20 when the sensor slave unit 40 is registered in the master unit 20. 6 and 7, the synchronization signal is composed of data for bit timing synchronization and data for bit position synchronization in the slot. The control data 1 is control data output from the first control data multiplex unit 210, and the error detection code 1 is a code for detecting a reception error of the control data 1. When the only handset registered in the base unit 20 is the telephone handset 30 and the sensor handset 40 is not registered, the amount of data to be transmitted by one control signal can be transmitted by one control data 1 If a single control signal is insufficient, transmission is performed using a plurality of control signals.

  In FIG. 7, control data 2, control data 3, control data 4, and control data 5 are control data output from the second control data multiplexing unit 211, and are error detection code 2, error detection code 3, The error detection code 4 and the error detection code 5 are codes for detecting reception errors of the immediately preceding control data 2, control data 3, control data 4, and control data 5. When the sensor slave unit 40 is registered in the master unit 20 as described above, in addition to the control data 1 and error detection code 1 shown in FIG. 6, the control data 2, control data 3, control data 4, control By using a format in which data 5 and respective error detection codes are connected, the amount of data to be transmitted is increased by one control signal, and all necessary information can be transmitted by one control signal as much as possible.

  6 and 7 includes an area for transmitting and receiving format identification information of data transmitted in the slot. The format identification information sent in the control data 1 is, for example, the format in which the slot data is configured as shown in FIG. 6, FIG. 7, or FIG. 9 or transmitted in the format shown in FIG. Whether the information in the areas of control data 2, control data 3, control data 4, and control data 5 indicates synchronization for TDMA communication or the operating state of the master unit, or for message communication between applications This information identifies whether the message is a message or the like.

  FIG. 8 is a diagram showing the types and transmission order of control signals transmitted by the master unit 20 in the format shown in FIG. 6 when only the telephone slave unit 30 is registered in the master unit 20. Here, an example of multiframe control in which various control signals are transmitted with 16 frames as one cycle is shown. As shown in FIG. 8, base unit 20 uses a frame whose frame number is an integer multiple of 16 to provide a PT message, a frame for notifying paging-related information such as call information and caller number information for caller number notification. A frame whose number is an integral multiple of 16 + 8, which notifies system information such as frame number, base unit function, communication frequency, standby frequency, etc., and is used as a reference frame for multi-frame control, and other frame number frames An NT message notifying the parent machine ID which is the parent machine identification information is transmitted.

  Next, an operation when a control signal is transmitted when only the telephone handset 30 is registered in the base unit 20 will be described with reference to FIGS. The control unit 230 of the parent device 20 stores information on the child device registered in the EEPROM 222. That is, when the master unit 20 registers the slave unit, the slave unit ID for identifying the slave unit and the slave unit type identification for identifying whether the slave unit is the telephone slave unit 30 or the sensor slave unit 40 Store information together. The control unit 230 controls the frame processing unit 202 and the radio unit 201 so as to transmit the control signal shown in FIG. 8 when the registered handset is only the phone handset 30. That is, the control unit 230 selects one of Slot: 1 to Slot: 12 to use for transmission of the control signal, selects one frequency from predetermined frequencies, and displays the selected slot and frequency as a diagram. 6 controls the transmission unit of the wireless unit 201 so that the control signal in the format shown in FIG. 6 can be transmitted (hereinafter, the slot selected by the control unit 230 of the base unit 20 for transmission of the control signal is referred to as a control slot).

  In addition, the control unit 230 writes its own base unit ID in the NT message buffer of the first control data multiplexing unit 210, and calls information and caller number notification in response to the occurrence of an event such as an incoming call in the PT message buffer. The phone number information of the caller for the call is written, and the QT message buffer has a control signal for notifying system information such as frame number, base unit function, slot number, use frequency and standby frequency every 16 frames. Control to write in order.

  The first control data multiplexing unit 210 outputs the data in the PT message buffer to the frame processing unit 202 when the frame number is an integer multiple of 16, and the QT message buffer data is framed when the frame number is an integer multiple of 16 + 8. The data is output to the processing unit 202. When the frame number is other than that, that is, when the frame number is neither an integer multiple of 16 nor an integer multiple of 16 + 8, the first control data multiplex unit 210 outputs the NT message buffer data to the frame processing unit 202. To do.

  The frame processing unit 202 embeds and transmits the data to be transmitted in the area of the control data 1 according to the data output from the first control data multiplexing unit 210 and the format identification information indicating that it is configured in the format of FIG. A data string is generated, and an error detection code 1 corresponding to the data to be transmitted in the control data 1 area is generated. In accordance with the control slot timing, the synchronization signal, control data 1, error The data string is output to the wireless unit 201 in the order of the detection code 1.

  Next, the reception operation of base unit 20 and the data format during voice communication between base unit 20 and telephone handset 30 will be described. FIG. 9 shows a data format when the base unit 20 and the telephone handset 30 make a voice call. In FIG. 9, the control data 1 area includes an area for sending format identification information indicating that it is configured in the format shown in FIG. 9, and an area for sending a control message for starting a voice call. This control message area is used for communication of an MT message for starting a communication channel, an NT message for notifying a base unit ID, and a CT message for notifying an upper layer negotiation message such as a network layer. The error detection code 1 is an error detection code area for detecting a reception error of the control data 1.

  For example, the audio data in the format shown in FIG. An area of audio data encoded by the 726 method, and an error detection code 6 is an area of an error detection code for detecting a reception error in the audio data area.

  The base unit 20 has 11 slots except for a slot that is 12 slots away from the control slot in 12 slots from Slot: 13 to Slot: 24 shown in FIG. It operates so as to receive a radio signal of a call activation request transmitted in the format. (Hereinafter, a slot that waits for a call activation request is called a standby slot). For example, when the slot for sending the control signal is Slot: 1, it is transmitted from the telephone cordless handset 30 in 11 Slots from Slot: 14 to Slot: 24 except Slot: 13 which is 12 Slots away from it. Receive incoming radio signals.

  The control unit 230 of the base unit 20 controls the reception frequency of the reception unit of the wireless unit 201 in order to perform reception using the standby slot. The reception frequency in the standby slot is changed in order from the smallest frequency number of the used frequency notified by the system information of the QT message of the control signal for each frame. The standby frequency notified by the system information of the QT message is information for notifying the reception frequency in the standby slot of the frame that transmitted the QT message.

  Received data received by the wireless unit 201 is output to the frame processing unit 202. The frame processing unit 202 extracts the data string of the control data 1 and error detection code 1 area shown in FIG. 6 from the reception data of each slot, and uses the data received in the error detection code 1 area to control the control data 1. It is determined whether the data in the area is correct data. If the data is correct, the control section 230 operates to notify the control section 230 of the data in the area of the control data 1.

  Next, the operation until the telephone handset 30 transitions to the idle state after the power is turned on will be described. When power is supplied to the telephone handset 30, an operation for searching for a control signal transmitted from the parent device 20 that is the parent device (hereinafter referred to as a parent device search operation) is performed. When a control signal transmitted from the base unit 20 is detected, various information transmitted by the QT message of the control signal is collected, and communication can be performed by synchronizing the frame and slot with the base unit based on the information. An operation (hereinafter referred to as a frame / slot synchronization operation) is performed.

  FIG. 10 shows an operation for the telephone handset 30 to establish frame and slot synchronization with the base unit 20. In FIG. 10, when the operation for synchronization is started, continuous reception for finding a parent device, that is, open search is started. When the synchronization signal shown in FIG. 6 is detected from the received data, a data string in the area of control data 1 and error detection code 1 is extracted from the subsequent received data, and an NT message for notifying the master unit ID of its own base unit is received. The control signal transmitted from its own base unit is detected by determining whether or not it exists. The example of FIG. 10 shows an example when the first message received after the open search is activated is a PT message. In this case, continuous reception is stopped, switching to reception with a period of 10 msec, and subsequent control signals after 10 msec are received. When receiving an NT message at the time of reception after 10 msec and recognizing that the signal being received is a control signal transmitted from its own base unit, the base unit search operation shifts to the frame / slot synchronization operation.

  In the frame / slot synchronization operation, the reception of 10 msec period is continued, the various information transmitted by a plurality of QT messages is collected, and the communication with the base unit is possible when the necessary information is gathered. It becomes a state. Thereafter, an idle state is established in which reception is performed in accordance with the timing of the PT message transmitted at a cycle of 160 msec.

  Next, the operation until the telephone handset 30 transitions to the idle state after the power is turned on will be described with reference to FIG. When the power is turned on, the control unit 330 starts operating. The control unit 330 controls the wireless unit 301 to perform a continuous reception operation at a predetermined frequency. The reception data received by the wireless unit 301 is output to the frame processing unit 302. The frame processing unit 302 searches for the synchronization signal shown in FIG. 6 from the received data, extracts the subsequent control data 1 and the error detection code 1 area data string, and uses the data received in the error detection code 1 area. It is determined whether or not the data in the area of the control data 1 is correct data. If the data is correct, the control data 330 operates to notify the control unit 330 of the data in the area of the control data 1.

  When the control data is notified, the control unit 330 of the telephone handset 30 controls to stop the continuous reception of the wireless unit 301 and switch to the reception with a period of 10 msec. Then, the own base unit ID stored in the EEPROM 322 is compared with the received data, and it is determined whether or not the received signal is data transmitted from the own base unit. Decide whether to move to synchronous operation. When the received data is other than the NT message, the control unit 330 determines whether the signal received based on the data received in the subsequent 10 msec period is the data transmitted from its own base unit. Judging.

  Then, when the received data is data transmitted from its own base unit, the control unit 330 continues to receive the 10 msec cycle and shifts to the frame / slot synchronization operation. When the received data is not the data transmitted from its own parent device, the open search is restarted and the search for the next parent device is started. Note that if the control signal of its own master unit is not received even though the master unit search operation has been performed for a certain time or a certain number of times at one frequency in the open search, the control unit 330 receives the control signal. The radio unit 301 is controlled to perform continuous reception operation by changing the frequency.

  The control unit 330 of the telephone handset 30 establishes synchronization of the frame number and slot number with the base unit 20 by receiving the frame number and system information of the QT message after shifting to the frame / slot synchronization operation, Also, the setting order of the reception frequency of the standby slot of the parent device is recognized. And control part 330 will start control which shifts to the idle state which receives in 160 msec period, if all the necessary information notified by a control signal is received. That is, the control is switched so as to activate reception of the wireless unit 301 in accordance with the timing of the PT message transmitted with a frame number that is a multiple of 16.

  Next, a call operation between the master unit 20 and the telephone slave unit 30 will be described taking an example of an operation when an external line incoming event occurs. When an external line incoming event occurs, control unit 230 of base unit 20 writes a PT message notifying the incoming of an external line (hereinafter referred to as an external line incoming message) in the PT message buffer of first control data multiplexing unit 210. This outside line incoming message is output to the wireless unit 201 at a timing at which the frame number is a multiple of 16, and is sent as a control signal in the control data 1 area shown in FIG.

  On the other hand, the radio unit 301 of the telephone handset 30 is receiving in the idle state at a timing with a frame number that is a multiple of 16. The radio unit 301 receives an incoming call message transmitted from the base unit 20 on the control signal. Received and output to the frame processing unit 202. Then, the frame processing unit 202 extracts the incoming call message from the area of the control data 1 shown in FIG. 6 and outputs it to the control unit 330.

  When receiving the outside line incoming message, the control unit 330 of the telephone cordless handset 30 performs a control of causing the display unit 323 to sound a ringer sound and notifying the user of an outside line incoming call. When the user performs an incoming call response operation on the operation unit 324, the control unit 330 selects one slot to be used for transmission from the slave unit in the subsequent communication from among the standby slots, and the subsequent communication. Select the frequency "communication frequency" to be used for. Hereinafter, the slot selected for transmission from the slave unit is referred to as “communication slave unit transmission slot” (or communication master unit reception slot). Furthermore, the control unit 330 selects a slot 12 slots away from the selected communication slave transmission slot, as a slot used for reception by the slave in subsequent communications. Hereinafter, the slot selected for reception by the slave unit is referred to as “communication slave unit reception slot” (or communication master unit transmission slot).

  Then, the control unit 330 sets the wireless unit 301 to receive the communication slave unit reception slot and the communication slave unit transmission slot using the communication frequency in these slots in order to check whether or not the communication slave unit transmission slot can be used without interference. Then, carrier sense of the communication slave unit transmission slot and the communication slave unit reception slot is performed.

  When the reception level of the interference wave of the slot is equal to or less than the threshold stored in the EEPROM 322, the control unit 330 of the telephone handset 30 determines that the slot can be used, and a message for starting the communication channel ( Hereinafter, the operation shifts to an operation for transmitting a radio link establishment request message. That is, the control unit 330 writes a radio link establishment request message in the MT message buffer of the control data multiplexing unit 310, and uses this slot in accordance with the slot that the base unit 20 waits at a frequency that matches the current communication frequency. The wireless unit 301 is controlled to transmit at the communication frequency. At this time, the communication between the telephone handset 30 and the base unit 20 uses the format shown in FIG. 9 as described above. The frame processing unit 302 puts the MT message including the radio link establishment request message on the control data 1 area in the format shown in FIG. 9, puts the audio data output from the audio processing unit 303 on the audio data area, Further, each error detection code is calculated, put on the area of error detection code 1 and output to the radio section 301, and the radio section 301 operates to transmit a radio signal including these.

  The radio signal including the radio link establishment request message transmitted from the telephone handset 30 is received by the radio unit 201 of the base unit 20 and output to the frame processing unit 202, and the radio link establishment request message is received by the frame processing unit 202. Is taken out and notified to the control unit 230.

  When receiving the radio link establishment request message, the control unit 230 of the base unit 20 receives the slot (communication base unit reception slot) that has received the radio link establishment request message from the telephone handset 30 and the slot (12 slots away from the slot). Using the uplink / downlink 2 slots consisting of the communication master unit transmission slot), control is started for voice communication with the slave unit using the frequency (communication frequency) at which the radio link establishment request message is received.

  In other words, in the control of voice communication, the control unit 230 of the base unit 20 performs transmission by the communication base unit transmission slot using the communication frequency in the frames after receiving the radio link establishment request message, and receives the communication base unit. The radio unit 201 is controlled to perform reception using the slot, and at that time, the radio link establishment response message is written in the MT message buffer corresponding to the communication base unit transmission slot of the first control data multiplex unit 210. The radio link establishment response message is output to the frame processing unit 202 so as to be transmitted at the timing of the communication master unit transmission slot, and the frame processing unit 202 sets the MT message of the radio link establishment response message in the control data 1 area. The voice data output from the voice processing unit 203 is transmitted on the voice data area, and the error detection code is calculated and transmitted on the error detection code area.

  As described above, a bidirectional wireless link is established between the telephone handset 30 and the base unit 20 in a slot that is 12 slots away. Then, the telephone handset 30 writes an upper layer message such as a network layer activation request message (SETUP) to the control data multiplex unit 310 in the CT message buffer of the control data multiplex unit 310, and the base unit 20 1 A higher layer message such as a network layer response message (CONNECT) is written to the control data multiplex unit 210 in the CT message buffer of the control data multiplex unit 310, and the CT message is transmitted and received in the same manner as the transmission and reception of the MT message. Then, the upper layer is negotiated, the call connection is completed, and a call is made possible.

  Next, an operation when the sensor slave unit 40 is registered in the master unit 20 will be described. FIG. 11 is a diagram showing the types of control signals transmitted by the master unit 20 and the transmission order when the sensor slave unit 40 is registered in the master unit 20. In this case, the format shown in FIG. 7 is used for the control signal transmitted by the base unit 20, and the information that is put inside the frame is updated. Hereinafter, replacement of information in a frame will be described in detail.

  When the sensor slave unit 40 is registered in the master unit 20, the master unit 20 detects the error with the control data 2 shown in FIG. 7 in addition to the control signal transmission data when only the telephone slave unit 30 is registered. Code 2, control data 3 and error detection code 3, control data 4 and error detection code 4, and control data 5 and error detection code 5, which are four control data and error detection code pairs, are transmitted.

  As shown in FIG. 11, in the area of control data 1, base unit 20 uses paging-related information such as call information in a frame whose frame number is an integral multiple of 16 and telephone number information of a caller for notification of caller ID. A PT message for notifying information is transmitted. In the area of the control data 1, the base unit 20 notifies system information such as the frame number, base unit function, communication frequency, standby frequency, etc. in a frame whose frame number is an integral multiple of 16 + 8, and serves as a reference frame for multi-frame control. Send the QT message to be used. In the area of the control data 1, an NT message for notifying the parent machine ID, which is the parent machine identification information, is transmitted in a frame having another frame number.

  Further, base unit 20 transmits format identification information using the area of control data 1 in all frames. When at least one sensor slave unit 40 is registered, the control signal message is added to the control data 1, control data 3, control data 4, control data 4, as shown in FIG. Control data 5 and a format in which respective error detection codes are connected are used, and control data such as information for notifying the synchronization for TDMA communication and the operation status of the master unit is transmitted using these data areas. Is transmitted to all registered slaves.

  In addition, in the control data 2, control data 3, control data 4, and control data 5, the base unit 20 duplicates the control channel information and the empty channel information twice in one frame, respectively. Are transmitted alternately so that they are not consecutive in the same frame. In the same control data area, information is transmitted while switching the order of information every time the frame number is updated. That is, in a frame with an even frame number, control channel information, empty channel information, control channel information, and empty channel information are transmitted in this order, and in an odd frame number frame, empty channel information, control channel information, empty channel information, Transmit in the order of control channel information. As a result, even if a disturbance or the like occurs, if only one control data area can be received normally, the control data area data can be received in multiple frames. Data can be acquired.

  Next, the operation of each unit will be described with reference to FIG. 3 regarding the operation in which the parent device 20 transmits a control signal when the sensor child device 40 is registered in the parent device 20. The control unit 230 of the parent device 20 stores information on the child device registered in the EEPROM 222. That is, when the slave unit is registered in the master unit 20, the slave unit ID for identifying the slave unit and the slave unit type for identifying whether the slave unit is the telephone slave unit 30 or the sensor slave unit 40 The identification information is combined and stored in the EEPROM 222.

  When the registered slave unit includes the sensor slave unit 40, the control unit 230 of the master unit 20 controls the frame processing unit 202 and the radio unit 201 to transmit the control signal shown in FIG. That is, the control unit 230 selects one from Slot: 1 to Slot: 12, and selects one frequency from a plurality of predetermined frequencies, and the selected slot and frequency are shown in FIG. The transmission unit of the wireless unit 201 is controlled so that the format control signal can be transmitted.

  In addition, the control unit 230 writes its own base unit ID in the NT message buffer of the first control data multiplexing unit 210, and calls information and caller number notification in response to the occurrence of an event such as an incoming call in the PT message buffer. The phone number information of the caller for the call is written, and the QT message buffer has a control signal for notifying system information such as frame number, base unit function, slot number, use frequency and standby frequency every 16 frames. Control to write in order. Thereby, the first control data multiplexing unit 210 of the base unit 20 outputs the data in the PT message buffer to the frame processing unit 202 when the frame number is an integer multiple of 16, and QT when the frame number is an integer multiple of 16 + 8. The data in the message buffer is output to the frame processing unit 202. When the frame number is other than that, that is, when the frame number is not an integral multiple of 16 and is not an integral multiple of 16 + 8, the first control data multiplexing unit 210 outputs the data of the NT message buffer to the frame processing unit 202. To do.

  In addition, the control unit 230 performs control to write control channel information and vacant channel information in the second control data multiplex unit 211 in accordance with the operation status. As a result, the second control data multiplex unit 211 transmits the control channel information in accordance with the transmission timing of the control data 2, the empty channel information in accordance with the transmission timing of the control data 3, and the control data in the frame having the even frame number. 4, the control channel information is output to the frame processing unit 202 in accordance with the transmission timing of 4, and the empty channel information is output in synchronization with the transmission timing of the control data 5. Also, the second control data multiplex unit 211, in a frame with an odd frame number, displays empty channel information according to the transmission timing of the control data 2, and control channel information according to the transmission timing of the control data 3, and the control data 4 The idle channel information is output to the frame processing unit 202 in accordance with the transmission timing of the control data 5, and the control channel information is output to the frame processing unit 202 in accordance with the transmission timing of the control data 5.

  The frame processing unit 202 is composed of control data 2, control data 3, control data 4, and control data 5 including control information such as information for notifying the synchronization for TDMA communication and the operation status of the master unit. A data string to be transmitted in the area of the control data 1 is generated with the format identification information indicating that it is configured in the format shown in FIG. 7 and the data output from the first control data multiplexing unit 210. Also, the frame processing unit 202 generates an error detection code 1 corresponding to the data transmitted in the control data 1 area, and outputs it in accordance with the transmission timing of the control data 2 output from the second control data multiplexing unit 221. The error detection code 2 corresponding to the data to be transmitted with the control data 2 generated is generated and transmitted with the control data 3 output in accordance with the transmission timing of the control data 3 output from the second control data multiplex unit 221 The error detection code 3 corresponding to the data is generated, and the error detection code 4 corresponding to the data transmitted with the control data 4 output in accordance with the transmission timing of the control data 4 output from the second control data multiplex unit 221. And output in accordance with the transmission timing of the control data 5 output from the second control data multiplex unit 221. Generating an error detection code 5 in accordance with the data to be transmitted by the control data 5.

  Then, the frame processing unit 202 synchronizes with the timing of the control slot, the control signal 1, the control data 1 (format identification information and data output from the first control data multiplexing unit 210), the error detection code 1, the control data. 2 (data output from the second control data multiplex unit 211), error detection code 2, control data 3 (data output from the second control data multiplex unit 211), error detection code 3, control data 4 ( The data sequence is wirelessly transmitted in the order of data output from the second control data multiplex unit 211), error detection code 4, control data 5 (data output from the second control data multiplex unit 211), and error detection code 5. Output to the unit 201. The radio unit 201 converts the radio signal into a radio signal having a predetermined frequency and transmits the radio signal as a control signal.

  Next, the reception operation of the master unit 20 when the sensor slave unit 40 is registered will be described. First, a method of message communication between the sensor slave unit 40 and the master unit 20 will be described. There are two methods for message transmission between the sensor slave unit 40 and the master unit 20. One is to establish a two-way wireless link using data in the format shown in FIG. 9 as in the case of two-way communication between the telephone handset 30 and the base unit 20, and to negotiate higher layers such as a network layer. This is a method for performing message communication in the application layer for notifying the sensor state and the like (hereinafter, this method is referred to as a connection message communication method). When the message of the application layer is transmitted and received between the sensor slave unit 40 and the master unit 20 by the connection message communication method, the sensor slave unit 40 does not send voice data to the master unit 20, so the voice data area in FIG. 9 is ignored. The application layer message is transmitted and received in the control data 1 area as one of the CT messages. In addition, when transmitting / receiving application layer messages using such a connection message communication method, the transmission / reception of the voice data area is stopped and only the synchronization signal, control data 1 and error detection code 1 are used using the format shown in FIG. It is also possible to transmit / receive an application layer message as one of the CT messages.

  Another method of message transmission between the sensor slave unit 40 and the master unit 20 is an application layer that uses the data in the format shown in FIG. 7 to notify the sensor state or the like without negotiation of an upper layer such as a network layer. (Hereinafter, this method is referred to as a connectionless message communication method). Such a connectionless message communication method completes data transmission by only one slot if there is no error or the like. In this case, in the area of the control data 1, the base unit by the format identification information indicating that the slot is transmitting a message for message communication between applications using the data of the format shown in FIG. 7 and the NT message An identification code is transmitted. Then, a slave unit identification code, a message identifier indicating that this message is a connectionless message, and a data string such as a message body are divided into areas of data 2, control data 3, control data 4, and control data 5, and transmitted. .

Next, the slot in which the master unit 20 receives communication from the sensor slave unit 40 will be described.
Since the base unit 20 waits for both the connection message communication method and the connectionless message communication method at the same time, all the 12 slots from Slot: 13 to Slot: 24 are always in a reception state and received from the sensor slave unit 40. To do. At this time, the slot that is 12 slots away from the control slot performs reception at a frequency equal to the transmission frequency of the control signal. In the other 11 slots, reception is performed at the reception frequency according to the reception frequency control in the standby slot notified by the system information of the QT message, and communication from the sensor slave unit 40 and the telephone slave unit 30 is waited for. .

  Next, with reference to FIG. 3, each block operation of the base unit 20 from Slot: 13 to Slot: 24 will be described. The control unit 230 of the master unit 20 receives a slot that is 12 slots away from the control slot at a frequency equal to the transmission frequency of the control signal. In other slots, the reception frequency control in the standby slot that is notified by the system information of the QT message. The receiving unit of the wireless unit 201 is controlled to receive at a receiving frequency along Received data received by the wireless unit 201 is output to the frame processing unit 202.

  The frame processing unit 202 extracts the data sequence of the control data 1 and error detection code 1 areas from the received data of each slot, and the data of the control data 1 area is obtained using the data received in the error detection code 1 area. Determine whether the data is correct. When the format identification information sent in the control data 1 area indicates that the received signal is configured in the format shown in FIG. 7, the data received in the error detection code 2 area is used. The data of the control data 2 area, the data received in the area of the error detection code 3 using the data received in the area of the error detection code 3, the data of the area of the control data 3 using the data received in the area of the error detection code 4 Using the data received in the area of the error detection code 5 as the area data, it is determined whether the data in the area of the control data 5 is correctly received, and the control area 230 is notified of the correctly received data in the control area To work. Upon receiving the data in the control data area, the control unit 230 analyzes the data and starts control according to the received data.

  Next, the operation of the sensor slave unit 40 will be described with reference to FIG. The sensor slave unit 40 is in a normal state, the switch 440 is turned off, and no power is supplied to the communication block 400. From this state, when the window changes from the closed state to the opened state, or from the opened state to the closed state, the sensor unit 443 detects the change, and the sensor unit 443 receives the power-on signal. Is output to the power supply control unit 441. When a power-on signal is input, the power controller 441 outputs a switching signal for turning on the switch 440. As a result, the switch 440 is turned on, and power is supplied to the communication block 400 via the switch 440.

  When power is supplied to the communication block 400, the control unit 430 starts operation and starts control according to the program written in the ROM 420. That is, the control unit 430 reads the window state from the sensor unit 443 and performs an operation of notifying the base unit 20 of the read window state by a wireless signal.

  Next, an operation in which the sensor slave unit 40 notifies the master unit 20 of the window state will be described. First, the operation until the sensor slave unit 40 receives the control signal from the master unit 20 and establishes synchronization will be described. The control unit 430 that has read the window state starts a master search operation and controls the radio unit 401 to perform a continuous reception operation at a predetermined frequency. The reception data received by the wireless unit 401 is output to the frame processing unit 402. If it is a control signal from the master unit 20, it should include the synchronization signal shown in FIG. The frame processing unit 402 searches for the synchronization signal shown in FIG. 7 from the received data, extracts the subsequent control data 1 and the error detection code 1 area data string, and uses the data received in the error detection code 1 area. It is determined whether or not the data in the area of the control data 1 is correct data. If the data is correct, the control data 430 operates to notify the control unit 430 of the data in the area of the control data 1.

  When the control data is notified, the control unit 430 controls to stop the continuous reception of the wireless unit 401 and switch to the synchronous reception operation of receiving a signal at a cycle of 10 msec. When the received control data includes an NT message for notifying the parent machine ID, the control unit 430 compares the received data with the own parent machine ID stored in the EEPROM 422, and the received signal is received from the own parent machine. It is determined whether or not the data is transmitted, and it is determined whether or not to shift from the parent device search operation to the frame / slot synchronization operation. If the first received data is other than the NT message, the control unit 430 is the data transmitted from its parent device based on the data received in the 10 msec period reception operation thereafter. Determine whether or not.

  Then, if the received data is data transmitted from its own base unit, the control unit 430 continues to receive for a period of 10 msec and shifts to the frame / slot synchronization operation. If the received data is not data transmitted from its own base unit, control unit 430 restarts open search and starts searching for the next base unit. If the control signal of the parent device cannot be received even though the parent device search operation is performed for a certain time or a certain number of times at one frequency, the control unit 430 changes the reception frequency. The wireless unit 401 is controlled to perform a continuous reception operation.

  When the control unit 430 shifts to the frame / slot synchronization operation, the control unit 430 reads the frame number and system information of the QT message placed in the area of the control data 1 thereafter, and based on these information, the frame number and slot with the base unit 20 The number of frames with the base unit 20 is determined based on the control channel information and the empty channel information received in the control data 2, control data 3, control data 4 or control data 5 area. The operation of establishing synchronization of slot numbers is performed in parallel. That is, if no reception error has occurred in the slot data that received the base unit ID of its own base unit in the control data 1 area, the control channel information received in the control data 2 and control data 3 areas of the slot And frame number and slot number synchronization are established with the empty channel information.

  If the communication environment is bad and all control data of the synchronization signal cannot be normally received in one slot, synchronization may be established by receiving the synchronization signal in a plurality of frames every 10 msec. For example, in an environment where control data 1 and control data 2 can be correctly received with the first synchronization signal and control data 3, control data 4 and control data 5 cannot be correctly received, the control data 1 area of the first synchronization signal is self-parent. One of the control channel information or the empty channel information is received in the area of the master unit ID and the control data 2 of the machine, and the other of the control channel information or the empty channel information is received in the area of the control data 2 of the slot received in the next frame. By receiving, the synchronization of the frame number and the slot number is established. In an environment where the control data 2, the control data 3, the control data 4, and the control data 5 cannot be correctly received, the control data 1 is sent once every 16 frames in the area of the control data 1 as in the case of the telephone slave unit 30. Necessary information is collected from the QT message, and the synchronization of the frame number and slot number is established.

  FIG. 12 and FIG. 13 show examples of operations from the parent device search operation to the establishment of frame number and slot number synchronization. The example of FIG. 12 is an example in the case where no reception error has occurred in the slot data that has received the parent machine ID of the parent machine in the control data 1 area. In the example of FIG. 13, the control data 3, the control data 4, and the control data 5 cannot be received correctly, and the slot that received the master device ID of its own master device in the area of the control data 1 and the slot received in the next frame In this example, synchronization is established based on the received data in the control data 2 area. The operation of establishing synchronization only with the data received in the area of the control data 1 because the control data 2, the control data 3, the control data 4, and the control data 5 cannot be correctly received is the telephone slave unit 30 shown in FIG. This is the same operation as the operation up to the completion of the frame / slot synchronization operation in the operation example of establishing synchronization.

  Next, the operation after synchronization establishment of the sensor slave unit 40 will be described. When the synchronization is completed, the control unit 430 of the sensor slave unit 40 continues to receive the slot in which the control signal can be received in each frame, and the same frequency as the frequency at which the control signal is received in a slot 12 slots away from the slot of the control signal. The radio unit 401 is controlled so as to receive the signal, and the interference wave level is measured (that is, carrier sense). When the sensor slave unit 40 transmits data to the master unit 20 by the connectionless message communication method, the sensor slave unit 40 transmits data at a slot 12 slots away from the slot of the control signal. Hereinafter, this slot is referred to as an uplink connectionless data transmission slot. The uplink connectionless data transmission slot is received in two consecutive frames, the interference wave level of the uplink connectionless data transmission slot is measured, and if the interference wave level is below a specified value, the connectionless message communication method is used. The operation shifts to an operation for notifying the master unit 20 of the window state.

  Next, an operation in which the sensor slave unit 40 notifies the master unit 20 of the window state by the connectionless message communication method will be described. The control unit 430 of the sensor slave unit 40 is set to transmit a message notifying the window state at a frequency equal to the frequency at which the control signal is received using the uplink connectionless data transmission slot. FIG. 14 shows a signal format when a message is communicated by the connectionless message communication method. A signal of the connectionless message communication system has a configuration close to the format of the control signal shown in FIG. 7, and other control data is connected after the control data 1. In FIG. 14, message transmission areas are described as CLMS1, CLMS2, CLMS3, and CLMS4. Error detection code 2 is a code for detecting an error in CLMS1, error detection code 3 is a code for detecting an error in CLMS2, error detection code 4 is a code for detecting an error in CLMS3, and error detection A code 5 is a code for detecting an error of the CLMS 4. The synchronization signal, control data 1 and error detection code 1 are the same as the format of the control signal in FIG.

  The message for notifying the window state is divided and sent to the CLMS1, CLMS2, CLMS3, and CLMS4 areas. The control unit 430 of the sensor slave unit 40 sets the base unit ID in the NT message buffer of the first control data multiplex unit 410 and notifies the second control data multiplex unit in order to notify the window status using the connection message communication method. A CLMS message composed of a slave unit identification code 410, a message identifier indicating that this message is a connectionless message, and a message notifying the window status is set in the CLMS information 410. The first control data multiplexing unit 410 outputs the data in the NT message buffer to the frame processing unit 202 in accordance with the transmission timing of the control data 1 of the uplink connectionless data transmission slot. The second control data multiplexing unit 411 divides the CLMS message, and outputs the CLMS message divided in accordance with the transmission timing of the CLMS1, CLMS2, CLMS3, and CLMS4 of the uplink connectionless data transmission slot to the frame processing unit 402.

  The frame processing unit 402 uses the format identification information indicating that this data string is configured in the format shown in FIG. 14 for sending the CLMS message, and the data output from the first control data multiplexing unit 410 to control data 1 A data string to be transmitted is generated in the area, and an error detection code 1 corresponding to the data to be transmitted in the control data 1 area is generated. Further, the frame processing unit 402 generates an error detection code 2 corresponding to the data transmitted by the CLMS1 output in synchronization with the transmission timing of the CLMS1 output from the second control data multiplexing unit 411, and outputs the second control data multi The error detection code 3 corresponding to the data transmitted by the CLMS 2 output in synchronization with the transmission timing of the CLMS 2 output from the plexer 411 is generated, and the transmission timing of the CLMS 3 output from the second control data multiplex unit 411 is generated. The error detection code 4 corresponding to the data transmitted by the CLMS 3 output together is generated, and the data transmitted by the CLMS 4 output in accordance with the transmission timing of the CLMS 4 output from the second control data multiplexing unit 411 The error detection code 5 is generated.

  The frame processing unit 402 synchronizes with the timing of the uplink connectionless data transmission slot, control data 1 (data output from the format identification information and first control data multiplex unit 410), error detection code 1 , CLMS1, error detection code 2, CLMS2, error detection code 3, CLMS3, error detection code 4, CLMS4, and error detection code 5 are output to radio section 401 in this order. The data string output to the radio unit 401 is converted into a radio signal having a frequency equal to the reception frequency of the control signal by the uplink connectionless data transmission slot and transmitted.

  When the transmission of the CLMS message is completed, after the next frame, the control unit 430 of the sensor slave unit 40 controls the radio unit 430 so that only the slot receiving the control signal continues the reception state. When receiving a reception response indicating that a CLMS message including window state information has been received from the transmission destination master unit 20, it recognizes that the window state information has successfully reached the master unit 20 and generates a power-off signal. Output to the power supply control unit 441. At that time, the control unit 430 sets a detection condition of the sensor unit 443 to output a power-on signal to the power control unit 441 when the window state changes from the previously notified state, and then the power-off signal is output. Is output. When a power-off signal is input, the power control unit 441 outputs a switching signal that turns off the switch 440. In response to the switching signal, the switch 440 cuts off the supply of power to the communication block 400, and the sensor The subunit | mobile_unit 30 returns to a normal state.

  Next, the operation in which the master unit 20 receives a CLMS message notifying the window state from the sensor slave unit 40 will be described. The radio signal including the CLMS message transmitted from the sensor slave unit 40 is received by the radio unit 201 of the base unit 20 and output to the frame processing unit 202. The frame processing unit 202 extracts the data string of the control data 1 and error detection code 1 area from the radio signal, and uses the data received in the error detection code 1 area, and the data of the control data 1 area is correct data. It is determined whether or not. When the format identification information indicates that the received signal is configured in the format shown in FIG. 14, the frame processing unit 202 uses the data received in the area of the error detection code 2 to Use the data received in the area of the error detection code 3 for the data in the area, the data in the area of the CLMS 2 using the data received in the area of the error detection code 4, and the data in the area of the CLMS 3 using the data received in the area of the error detection code 4 The data received in the area 5 is used to determine whether the data in the CLMS 4 area is correctly received. Then, when all the data received in the CLMS1, CLMS2, CLMS3, and CLMS4 areas are correctly received, the frame processing unit 202 combines the data received in the CLMS1, CLMS2, CLMS3, and CLMS4 areas. It operates to notify the control unit 230 together with data received in the control data 1 area as two CLMS messages.

  The control unit 230 that has received the received data and the CLMS message in the control data 1 area receives the CLMS message if the data received in the control data 1 area is an NT message having the same base unit identification information as its own ID. It is determined that it is addressed to itself, the operation corresponding to the information notified by the CLMS message is started, and the data received in the area of the control data 1 is other than the NT message of the same base unit identification information as its own ID If so, the CLMS message is discarded. Further, the control unit 230 determines whether or not the sensor slave unit is registered based on the slave unit identification code included in the CLMS message, and discards the CLMS message if it is a CLMS message from an unregistered slave unit. .

  When the control unit 230 receives a CLMS message for notifying the state of the window addressed to itself from the registered sensor slave unit, the control unit 230 displays the window state of the corresponding sensor slave unit on the display unit 223. In addition, the display of the state of the window is a display on the LCD or a sound of a ringer or the like. When the window is set to be notified by a warning sound, it is notified that the window has been opened. Then, the ringer is sounded, the surroundings are notified that the window has been opened, and the ringer is operated to be stopped by an instruction from the operation unit 224.

  Next, when the master unit 20 receives the CLMS message including the window information from the sensor slave unit 40, the reception response indicating that the CLMS message including the window information is normally received from the master unit 20 to the sensor slave unit 40. The operation for notifying will be described. A message for notifying that a CLMS message for notifying a window state has been received (hereinafter referred to as a reception response) uses the format shown in FIG. 14 and is sent to the slave unit at the same frequency as the control signal in the slot transmitting the control signal. Sent. That is, the control unit 230 matches the CLMS information of the second control data multiplex unit 211 with the child slave unit 40 of the transmission destination in accordance with the control slot timing of the frame in which the base unit identification code is transmitted in the control data 1 area. A CLMS message including a machine identification code, a message identifier indicating that this message is a connectionless message, and a message notifying a reception response is set. The second control data multiplexing unit 211 divides the CLMS message and outputs the CLMS message divided in accordance with the transmission timing of the CLMS1, CLMS2, CLMS3, and CLMS4 of the control signal to the frame processing unit 402.

  The frame processing unit 202 includes format identification information indicating that this data string is configured in the format shown in FIG. 14 for sending a CLMS message, and data output from the first control data multiplexing unit 210 (master unit identification). (Information) is put on the control data 1 area to generate a data string, and an error detection code 1 corresponding to the data to be transmitted in the control data 1 area is generated. Further, the frame processing unit 202 generates an error detection code 2 corresponding to the data transmitted by the CLMS1 output in synchronization with the transmission timing of the CLMS1 output from the second control data multiplexing unit 211, and outputs the second control data multi The error detection code 3 corresponding to the data transmitted by the CLMS2 output in synchronization with the transmission timing of the CLMS2 output from the multiplex unit 211 is generated, and the transmission timing of the CLMS3 output from the second control data multiplex unit 211 is generated. The error detection code 4 corresponding to the data transmitted by the CLMS 3 output together is generated, and the data transmitted by the CLMS 4 output according to the transmission timing of the CLMS 4 output from the second control data multiplexing unit 211 The error detection code 5 is generated.

  Then, the frame processing unit 202 synchronizes with the timing of the control slot, the synchronization signal, the control data 1 (format identification information and the base unit identification information output from the first control data multiplexing unit 210), error detection code 1 , CLMS1, error detection code 2, CLMS2, error detection code 3, CLMS3, error detection code 4, CLMS4, and error detection code 5 are output to radio section 201 in this order. The data string output to the radio unit 401 is converted into a radio signal having a frequency for a control signal by the control slot and transmitted. When the transmission of the CLMS message is completed, the control unit 230 performs control to return to the state of transmitting the control signal shown in FIG. 11 in the control slot after the next frame.

  FIG. 15 shows that the above-described sensor slave unit 40 detects that the state of the window has changed, power is supplied to the wireless block 400, and synchronization is established with the master unit 20 that transmits a control signal at Slot: 1. An example of the operation until the base unit 20 is notified of the state of the window by a CLMS message and the power of the wireless block 400 is shut off will be shown. In the example of FIG. 15, the sensor slave unit 40 changes its window state at a certain time before the frame 1, power is supplied to the communication block 400, operation for synchronization is started, and continuous reception (open search) is performed. Is activated. When the sync signal is detected from the received data, the master unit identification information is obtained from the subsequent data to check if it is truly a control signal from the master unit. Establish synchronization. In the example of FIG. 15, synchronization with the control signal of the parent device is established at Slot: 1 of frame 2.

  Then, the sensor slave unit 40 selects a slot: 13 that is 12 slots apart from the slot that is half the number of slots accommodated in the frame from the slot that received the control signal, as the slot that transmits the CLMS message. Then, carrier sense for confirming the presence / absence of an interfering wave is performed at slot 2 of frame 2 and frame 3 and a CLMS message for notifying the window state is transmitted at slot 13 of frame 4. The sensor slave unit 40 repeats the transmission of the CLMS message a predetermined number of times when the reception response cannot be received within a predetermined time after the transmission of the CLMS message.

  In addition, if the reception response from the master unit is not received even after sending a predetermined number of CLMS messages, there is a possibility that the interference wave level of this uplink connectionless data transmission slot is high. Connection for performing message communication in the application layer for notifying the state of the sensor by establishing a bidirectional wireless link and negotiating higher layers such as the network layer in the same way as in bidirectional communication between the device 30 and the parent device 20 The window state is notified to the base unit 20 by the message communication method.

  Further, if the window state cannot be notified to the master unit 20 even using the connection message communication method, the control unit 430 outputs a power-on signal to the power control unit 441 after a predetermined time has elapsed. The time information is set in the timer unit 442, and a power-off signal is output to the power control unit 441. When a power-off signal is input, the power controller 441 outputs a switching signal for turning off the switch 440. The switch 440 cuts off the power supply to the communication block 400, and the sensor slave unit 40 returns to the normal state. . The timer unit 442 of the sensor slave unit 40 is always driven by a battery. After the predetermined time has elapsed, a power-on signal is output from the timer unit 442 to the power control unit 441, and power is supplied to the wireless block. Then, the control unit 430 starts the operation of notifying the master unit 20 of the window state again.

  Next, an operation in which the base unit 20 notifies the telephone handset 30 that it has received a CLMS message including the window state sent from the sensor handset 40 will be described. For the notification of the base unit 20 to the telephone handset 30, the PT message of the control signal transmitted in the control slot is used in the same way as the notification of the outside line incoming message. That is, when receiving the CLMS message for notifying the window status from the sensor slave unit 40, the control unit 230 of the master unit 20 provides a PT message for notifying the window status of the sensor slave unit 40 (hereinafter referred to as a window status notification message). ) In the PT message buffer of the first control data multiplex unit 210. This window state notification message is output to the wireless unit 201 and transmitted at a timing when the frame number is a multiple of 16.

  On the other hand, the telephone handset 30 is receiving in the idle state at a timing with a frame number that is a multiple of 16. The window state notification message is received by the wireless unit 301 and output to the frame processing unit 202 in the same manner as the outside line incoming message. Is done. Then, the data received in the area of the control data 1 shown in FIG. 6 by the frame processing unit 202, that is, the window state notification message is extracted and output to the control unit 330. When the control unit 330 receives the window state notification message, the control unit 330 controls the display unit 323 to display a change in the affection of the window by, for example, ringing a ringer sound.

  Since the window state notification message is transmitted as a PT message as a part of the control signal, the sensor slave unit 40 waiting for reception of the reception response can also be received. When receiving the window state notification message before receiving the reception response, the sensor slave unit 40 shuts off the power supply to the communication block 400 and returns to the normal state as in the case of receiving the reception response. It is also possible to control.

  In the above, a cordless telephone and a door opening / closing notification sensor have been described as examples of embodiments of the present invention. However, the present invention is not limited to this, and various notification devices, emergency buttons, nurses that operate depending on the control station are described. The present invention can be applied to an apparatus that notifies a control station of various events by wireless communication, such as a call, an apparatus (such as a smart grid or an energy management system) that monitors the operating state and power consumption of various electric devices.

  INDUSTRIAL APPLICABILITY The present invention is useful for a wireless communication system applicable to a wireless sensor, and can realize a device that reduces power consumption and is strong against interference caused by wireless interference.

DESCRIPTION OF SYMBOLS 10 Wireless communication apparatus 20 Parent | base station 30 Telephone subunit | mobile_unit 40 Sensor subunit | mobile_unit 201 Radio | wireless part 202 Frame processing part 203 Voice processing part 210 1st control data multiplex part 211 2nd control data multiplex part 220 ROM
221 RAM
222 EEPROM
223 Display unit 224 Operation unit 230 Control unit 301 Radio unit 302 Frame processing unit 303 Audio processing unit 310 Control data multiplexing unit 320 ROM
321 RAM
322 EEPROM
323 Display unit 324 Operation unit 330 Control unit 400 Communication block 401 Wireless unit 402 Frame processing unit 410 First control data multiplex unit 411 Second control data multiplex unit 420 ROM
421 RAM
422 EEPROM
430 Control unit 440 Switch 441 Power supply control unit 442 Timer unit 443 Sensor unit 444 Power supply unit

Claims (15)

Consists of a control station and a dependent station that perform time division multiplex communication. The dependent station receives a control signal transmitted by the control station, and performs control based on control signal reception timing and control data broadcast by the control signal. A wireless communication system for performing time division multiplex communication with a station, wherein the control station includes wireless means for performing wireless communication, frame processing means for constructing a transmission data sequence in a predetermined format, and one slot. When transmitting information necessary for the slave station to perform communication in each region and transmitting the same information in different slots, the region in the slot transmitting the same information Control means for controlling to transmit in an area different from the area in the transmitted slot;
The subordinate station is transmitted in a plurality of areas in the same slot, a wireless means for performing wireless communication, a frame processing means for independently extracting a plurality of pieces of information sent in the same slot from the received data string, and A wireless communication system comprising control means for performing control to communicate with the control station based on incoming information. The control means of the control station performs control so as to transmit a plurality of predetermined specific data among control data notified by a control signal in the same area of a plurality of slots. The wireless communication system described. 2. The wireless communication system according to claim 1, wherein the control means of the control station controls to transmit the same control data in a plurality of areas in the same slot. The control means of the control station controls to transmit the same data in non-adjacent areas when controlling to transmit the same control data in a plurality of areas in the same slot. Item 4. The wireless communication system according to Item 3. The dependent station includes a sensor unit that detects a predetermined state, a wireless unit, a frame processing unit, and a power source control unit that turns on / off power supply to the control unit, and detects the predetermined state. When power is supplied to the wireless means, the frame processing means, and the control means, a control signal transmitted from the control station is received, and synchronization of time division multiplex communication with the control station is established and detected by the sensor means. The wireless communication system according to any one of claims 1 to 4, wherein the control state is notified to the control station. The subordinate station sensor means operates to detect the state notified from the control means, and the control means notifies the control station of the state detected by the sensor means, and then detects the next by the sensor means. 6. The wireless communication system according to claim 5, wherein a state to be performed is notified to the sensor means, and the power supply control means is controlled to turn off the power supply to the wireless means, the frame processing means, and the control means. . It is composed of a control station that performs time division multiplex communication, a first dependent station, and a second dependent station, and the first dependent station and the second dependent station receive a control signal transmitted by the control station. The time dependent multiplex communication with the control station is performed based on the reception timing of the control signal and the control data broadcasted by the control signal, and the first subordinate station performs the control during a period during which transmission to the control station is unnecessary. Receiving a control signal transmitted by the station at a predetermined cycle, and maintaining synchronization of time division multiplex communication with the control station, wherein the second subordinate station transmits to the control station Is a wireless communication system that operates to stop receiving the control signal transmitted by the control station during a period that is unnecessary,
The control station divides a slot into a plurality of areas, a wireless means for performing wireless communication, a frame processing means for constructing a transmission data sequence in a predetermined format, and a first area of the plurality of areas. The first dependent station synchronizes time division multiplex communication and transmits information for maintaining synchronization, and the second dependent station transmits time division multiplex communication in a region other than the top region of the plurality of regions. Send the information necessary to synchronize and communicate with the control station,
When the second slave station transmits the same information necessary for synchronizing the time division multiplexing communication and communicating with the control station in different slots,
Control means for controlling the area in the slot for transmitting the same information to be transmitted in an area different from the area in the previously transmitted slot;
The second dependent station transmits a wireless means for performing wireless communication, a frame processing means for independently extracting a plurality of pieces of information sent from the received data string in the same slot, and a plurality of areas in the same slot. A wireless communication system comprising control means for controlling communication with the control station based on information received.   The control station transmits information for identifying a control station in a head area of the plurality of areas, and the second subordinate station is information for identifying a control station transmitted in the head area of the plurality of areas. The wireless communication system according to claim 7, wherein the wireless communication system operates so as to select a control station received on the basis of. The control means of the control station transmits a plurality of specific data necessary for the second subordinate station to be notified by the control signal to synchronize the time division multiplex communication and communicate with the control station in the same slot. 9. The wireless communication system according to claim 7, wherein control is performed so that transmission is performed in a region. The control means of the control station transmits the same control data necessary for the second dependent station to synchronize the time division multiplex communication and communicate with the control station in a plurality of areas in the same slot. The wireless communication system according to claim 7 or 8, wherein the wireless communication system is controlled as follows. The control means of the control station controls to transmit the same data in non-adjacent areas when controlling to transmit the same control data in a plurality of areas in the same slot. Item 11. The wireless communication system according to Item 10. The second dependent station includes a sensor unit that detects a predetermined state, a wireless unit, a frame processing unit, and a power source control unit that turns on / off power supply to the control unit, and has a predetermined state. The power supply to the wireless means, the frame processing means, and the control means, and the control signal transmitted from the control station is received and the synchronization of the time division multiplex communication with the control station is established. The wireless communication system according to any one of claims 7 to 11, wherein a state detected by the means is notified to a control station. The sensor means of the second dependent station operates to detect the state notified from the control means, and the control means notifies the control station of the state detected by the sensor means, and then the sensor means The state to be detected next is notified to the sensor means, and the power supply control means is controlled to turn off the power supply to the wireless means, the frame processing means, and the control means. Wireless communication system. The control means of the control station is configured to detect a state detected by the sensor means notified from the second dependent station in a predetermined cycle so that the first dependent station maintains synchronization of time division multiplex communication. The radio communication system according to claim 12 or 13, wherein a notification is given by a control signal transmitted at a transmission timing of a control signal received in step (b), and notification is made to the first dependent station. The control means of the control station divides one slot into a plurality of areas when the second dependent station is unregistered, and the first dependent station is time-division multiplexed in the head area of the plurality of areas. The information for maintaining communication synchronization is transmitted, and control is performed so as not to perform transmission in an area other than the head area of the plurality of areas. The wireless communication system according to the section.