JP4752350B2 - Wireless communication system - Google Patents

Description

  The present invention relates to a wireless communication system that performs time division multiplex communication between a plurality of control stations and dependent stations.

  There is a wireless communication system in which one control station and a plurality of dependent stations perform time division multiplex communication. For example, as shown in FIG. 8, in the cordless telephone system 3, if the cordless telephone master unit 3a is a control station and a plurality of cordless telephone slave units 3b are subordinate stations, the user can be cordless when there is an incoming call. Since the telephone handset 3b can be used for calling and it is not necessary to go to the cordless telephone base set 3a, the convenience is high.

  On the other hand, in the wireless door phone system 2, if the door phone master unit 2b connected to the entrance slave unit 2a is a control station and the door phone slave unit 2c is a subordinate station, a call from a visitor's entrance slave unit 2a occurs. Since the doorphone slave unit 2c can respond even at a place away from the doorphone master unit 2b, the convenience is high as in the cordless telephone system 3.

  Further, in order to further improve the convenience of the cordless telephone system 3 and the wireless doorphone system 2, the cordless telephone base unit 3a is used as a main control station of the entire wireless communication system, and the doorphone base unit 2b is wirelessly connected as a subordinate station thereof. A wireless communication system has been proposed in which the cordless telephone base unit 3a and the doorphone base unit 2b are synchronized, and the cordless telephone base unit 3a and the cordless telephone handset 3b can respond to the doorphone.

  When the same cordless telephone system is configured with a plurality of master units, the control signal transmitted from the reference master unit among the plurality of master units is received by the other master unit, and this control signal is received. A device in which a control signal is transmitted from another parent device in synchronization with the timing is known (Patent Document 1).

In addition, there is a timing extraction unit that extracts the timing of the time slot of the public base station in the base station of the digital radio telephone apparatus that has a mobile phone function used outdoors and a cordless telephone function mainly used around the home. In addition, there is known one in which a radiotelephone base unit sets a time slot timing for a radiotelephone slave unit based on the time slot timing of a public base station (Patent Document 2).
JP-A-8-251661 Japanese Patent Laid-Open No. 7-87556

  However, in the wireless communication system in which the cordless telephone system and the wireless doorphone system are wirelessly connected, when the doorphone master unit cannot receive the control signal of the cordless telephone master unit, the doorphone master unit transmits the cordless telephone master unit. In order to receive the control signal, the transmission of the control signal is stopped and re-captured in the continuous reception state, so the doorphone slave unit is synchronized with the doorphone master unit until the synchronization between the doorphone master unit and the cordless phone master unit is established. If the doorphone master unit cannot receive the control signal of the cordless phone master unit for a long time because the radio interference continues for a while because it cannot be established, it will be out of service area. Had the problem of not being able to notify the door phone slave unit.

Accordingly, the present invention provides a wireless communication system in which a cordless telephone system that provides different services and a wireless doorphone system are connected wirelessly, even if a system failure due to a wireless error occurs, the convenience of each service is not impaired. It aims at providing the radio | wireless communications system which recovers from.

The present invention operates as a main control station that starts a reacquisition timer when the synchronization acquisition timer expires without the sub-control station being able to synchronize with the main control station and transmits a control signal at its own timing until the reacquisition timer expires When the re-acquisition timer expires, a re-acquisition counter is added, and when the re-acquisition counter reaches the maximum value, it operates as a main control station that transmits a control signal at its own timing without starting the re-acquisition timer As a sub-control station that stops the transmission of the control signal at its own timing and receives the control signal transmitted by the main control station when a synchronization acquisition restart request is made by the slave unit equipped with the synchronization request means The main feature is to move to the operation.

When the sub-control station cannot synchronize with the main control station, the radio communication system of the present invention repeats the operation as the main control station and the operation as the dependent station until the re-acquisition counter reaches the maximum value. After reaching, the control signal transmitted by the main control station is received again when the synchronization acquisition restart request is made by the user's operation, and the recovery from the system failure is resumed by the operation from the subordinate station. It has advantages.

  If the sub-control station does not synchronize with the main control station after a certain period of time, the sub-control station continues to operate as a main control station for its subordinate stations, so that the main control station Even if it no longer exists due to a failure or the like, there is an advantage that a single service can be continued.

In a wireless communication system in which wireless communication systems that provide different services are connected wirelessly, the present invention can recover from a system failure without losing the convenience of each service even if a system failure occurs due to a wireless error. If the secondary control station cannot synchronize with the main control station, repeat the operation as the main control station and the operation as the subordinate station until the reacquisition counter reaches the maximum value, and after the acquisition counter reaches the maximum value This is realized by receiving a control signal transmitted from the main control station again when a synchronization acquisition resumption request is made by the user's operation, and moving to the operation as a dependent station for the main control station.

In order to solve the above problems, a first invention is a first device that operates as a main control station or a sub-control station subordinate to the main control station, a second device that operates as a main control station, and a subordinate A third device operating as a station, wherein the first device transmits a first control signal based on time division multiplex communication at a first timing, and the second device includes a second device based on time division multiplex communication. A wireless communication system that transmits a control signal and the third device performs wireless communication with each other by receiving the first and second control signals, wherein the second device has a second timing. The second control signal is transmitted, and the first device receives the second control signal transmitted by the second device, thereby synchronizing the first control with the second timing. It performs the operation as the sub-control station for transmitting a signal, before The second device starts the synchronization acquisition timer when starting the reception operation of the second control signal to be transmitted, and starts the reacquisition timer when the second device and the synchronization can not leave the synchronous acquisition timer expires said communicating with the recapture timer its first said timing of the first said control signal by performing an operation as a main control station for transmitting the third device until expiration, when the reacquisition timer has expired The re-acquisition counter is added, and when the re-acquisition counter reaches the maximum value, the re-acquisition counter is not started and the operation as the main control station that transmits the first control signal at its first timing is performed. When the third device is in communication with the third device and cannot synchronize with the second device and continues to operate as a main control station, when the third device makes a synchronization acquisition restart request, the first device Taimin The transmission of the first control signal is stopped and the reception operation for receiving the second control signal transmitted by the second device is performed, and a different service is provided. In a wireless communication system that wirelessly connects a cordless telephone system and a wireless door phone system, for example, when a system failure occurs, there is an advantage of recovering from the system failure without impairing the convenience of each service. In addition, there is an advantage that the recovery from the system failure is resumed by the operation from the third device without performing the operation on the first device side.

The second invention made to solve the above problem is that, when the first device cannot synchronize with the second device , the main device transmits a control signal serving as a time division multiplex time reference at its own timing. Performing the operation as the control station, repeating the operation as the main control station and the operation as the sub-control station until synchronization with the second device while gradually increasing the time for wireless communication with the third device. For example , in a wireless communication system that wirelessly connects a cordless telephone system that provides different services and a wireless doorphone system, when a system failure occurs, for example , a cordless telephone in which the first device serves as a main control station By giving priority to the operation of the system alone, there is an advantage of recovering from a system failure without impairing the convenience of the service.

Third invention has been made in order to solve the above problems, the first device if it can not second device and synchronizing the operation of the sub-control station second device to receive the control signal to be transmitted It is obtained by and repeating the operations and operation as the sub-control station of the main control station until the synchronization with the second device while continue to gradually reduce the time for performing radio stem to provide different services When a system failure occurs in the wireless communication system connected by the wireless communication system, for example, priority is given to the operation of the cordless telephone system alone in which the first device is the main control station . It has the advantage of performing recovery.

According to a fourth aspect of the invention made to solve the above problem, the first device repeats the operation as the main control station and the operation as the sub control station until the first device is synchronized with the second device . If the device cannot be synchronized, the operation as the main control station is continued. Even if the second device does not exist due to a failure or the like, the independent service can be continued. Have advantages.

(Embodiment 1)
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS.

  FIG. 1 is a configuration diagram of a radio communication system according to an embodiment of the present invention.

  FIG. 2 is a configuration diagram of the wireless door phone system according to the embodiment of the present invention.

  3 to 5 are sequence diagrams for explaining the operation of the radio communication system according to the embodiment of the present invention.

As shown in FIG. 1, the wireless communication system according to the embodiment of the present invention includes a cordless telephone system 3 and a wireless door phone system 2. The cordless telephone system 3 includes a cordless telephone base unit 3a that is a wireless communication apparatus that operates as a control station of the cordless telephone system 3, and a cordless telephone handset 3b that is a wireless communication apparatus that operates as a subordinate station of the cordless telephone base unit 3a. Composed. The wireless door phone system 2 includes an door phone main unit 2b that is a wireless communication device that operates as a control station of the wireless door phone system 2, and a door unit including a call unit and a call detection unit that are wired to the door phone main unit 2b. 2a and a doorphone slave unit 2c that is a wireless communication device that operates as a subordinate station of the doorphone master unit 2b.

  In the wireless communication system of the present embodiment, the cordless telephone master unit 3a is the main control station, the doorphone master unit 2b is the sub-control station, the wireless slave unit 4 is the subordinate station of the cordless phone master unit 3a and the doorphone master unit 2b, and the door phone unit. The machine 2c is a subordinate station of the doorphone master unit 2b, and the cordless telephone slave unit 3b is a subordinate station of the cordless telephone master unit 3a, and communicates by radio time division multiplexing. With this configuration, the cordless telephone system 3 and the wireless doorphone system 2 can communicate with each other. As a result, communication between the cordless telephone cordless handset 3b and the door phone cordless handset 2c becomes possible, and the wireless handset 4 can be directly used as the handset of both systems, so that the convenience is further increased. Get higher.

  As shown in FIG. 2, the entrance cordless handset 2a and the doorphone master set 2b of the wireless doorphone system 2 are connected by wire. The entrance cordless handset 2 a includes a door phone call detection unit 101 and a door phone call unit 102. When the visitor presses the call button, door phone call detection unit 101 detects the door phone call and outputs it as door phone call notification to door phone parent device 2b. The door phone call unit 102 includes a speaker and a microphone, and has a function of making a call with a visitor.

  The intercom base unit 2b includes a radio unit 201, a control signal detection unit 202, a control signal transmission unit 203, a synchronization processing unit 204, a control unit 205, a data reception unit 206, a data transmission unit 207, and a notification unit. 208, door phone master unit operation unit 209, and door phone master unit call unit 210.

  The radio unit 201 performs modulation / demodulation in order to perform time division multiplex communication, and transmits and receives via an antenna. The control signal detection unit 202 detects a control signal periodically transmitted from the cordless telephone base unit 3a from the reception signals received via the wireless unit 201. The control signal transmission unit 203 transmits a control signal to the doorphone slave unit 2c and the wireless slave unit 4 that are subordinate stations of the doorphone master unit 2b. The synchronization processing unit 204 performs synchronization processing by causing the wireless unit 201 to be in a continuous reception state or causing the control signal transmission unit 203 to transmit a control signal so that the control signal detection unit 202 can detect the control signal.

The control unit 205 performs overall control of the entrance cordless handset 2a and the door phone master set 2b.
The data reception unit 206 performs reception data processing addressed to the intercom master unit 2 b from the reception signal, and outputs the reception data to the control unit 205. This received data includes the door phone call response received when the responder performs a response operation on the door phone slave unit 2c, the voice from the door phone slave unit 2c, and the like.

  The data transmission unit 207 receives the doorphone call and voice from the entrance cordless handset 2 a through the control unit 205, performs transmission data processing, and transmits through the wireless unit 201. When the door phone call from the entrance cordless handset 2 a is input via the control unit 205, the notification unit 208 notifies the speaker provided in the door phone parent device call unit 210.

  The door phone master unit operation unit 209 includes a response button. When the notification unit 208 is notified of the door phone call, the responder presses the response button, so that the control unit 205 and the door phone call unit 102 of the entrance cordless handset 2a are connected to the door phone. It is possible to make a call between the doorphone base unit call unit 210 of base unit 2b.

  The intercom base unit call unit 210 includes a speaker and a microphone, and has a function of allowing a responder to perform a call with the doorphone call unit 102 of the front cordless handset 2a via the control unit 205.

  The operation of the wireless communication system according to the embodiment of the present invention configured as described above will be described.

  First, when the doorphone master unit 2b (sub control station) is immediately after power-on or within the communication range of the cordless phone master unit 3a (main control station), the cordless phone base unit 3a (main control station) is in communication due to a radio error. The operation of the intercom master unit 2b (sub control station) when the own apparatus is restarted because the control signal cannot be received will be described.

  As shown in FIG. 3, first, the synchronization processing unit 204 activates the synchronization acquisition timer (St1), puts the wireless unit 201 into a continuous reception state, and starts the synchronization acquisition operation of the cordless telephone master unit 3a (main control station). To do. When the control signal detection unit 202 detects a control signal from the cordless telephone base unit 3a (main control station) via the wireless unit 201, it outputs a control signal detection success notification to the synchronization processing unit 204. The synchronization processing unit 204 to which the control signal detection success notification is input establishes synchronization with the cordless telephone master unit 3a (main control station). The control signal transmission unit 203 performs control in synchronization with the timing of the control signal from the cordless telephone base unit 3a on a slot other than the slot including the control signal received from the cordless telephone base unit 3a (main control station). A signal is transmitted, and this control signal can be received not only by the doorphone slave unit 2a but also by the wireless slave unit 4 that is a dual-purpose slave unit.

  By operating in this way, the doorphone master unit 2b (sub control station) operates as a slave station of the cordless phone master unit 3a in synchronization with the cordless phone master unit 3a (main control station), and further the doorphone slave unit. Since 2c (subordinate station) and the wireless slave unit 4 (subordinate station) are synchronized with the doorphone master unit 2b (sub control station), the entire radio communication system is consequently synchronized with the cordless telephone master unit 3a (main control station). It will be.

  For example, when a visitor operates the door phone call detection unit 101 of the front door 2a, for example, the signal is transmitted to the door phone master 2b (sub control station) by wire, and the door phone master 2b transmits the door phone call information to the wireless unit. It transmits via 201. This door phone call information is sent to the door phone child device 2c, which is a subordinate station of the door phone parent device 2b, and the wireless child device 4, which is a dual-purpose child device. The door phone call information is also sent to the cordless telephone master unit 3a.

  The notification unit 208 of the door phone master unit 2b notifies the ringing by a signal from the entrance cordless handset 2a. When the responder presses a response button on the doorphone master unit operation unit 209, the control unit 205 enables a call between the doorphone call unit 102 of the front door unit 2a and the doorphone base unit call unit 210 of the doorphone base unit 2b.

  In addition, when the responder presses the response button of the door phone slave unit 2c, the control unit 205 establishes a communication path with the door phone slave unit 2c via the wireless unit 201, and can perform a call between the entrance slave unit 2a and the door phone slave unit 2c. And Similarly, when the responder presses the response button of the wireless slave unit 4, the control unit 205 establishes a communication path with the wireless slave unit 4 via the wireless unit 201, and between the entrance slave unit 2a and the door phone slave unit 2c. Make a call.

  The cordless telephone master unit 3a that has received the call information transfer from the doorphone master unit 2b sends the call information to the cordless telephone slave unit 3b that operates as a subordinate station. Even when the responder presses a response button in the cordless telephone cordless handset 3b, the control unit 205 establishes a communication path with the cordless telephone cordless handset 3b via the wireless unit 201, and the entrance cordless handset 2a and the cordless telephone cordless handset 3b. Calls can also be made with.

Next, the doorphone master unit 2b (sub control station) has started the synchronization acquisition operation of the cordless telephone master unit 3a (main control station), but the control signal from the cordless telephone master unit 3a (main control station) cannot be detected. The operation in the case of the case will be described.

  As shown in FIG. 4, first, the synchronization processing unit 204 starts the synchronization acquisition timer (St1), sets the wireless unit 201 to the continuous reception state, and starts the synchronization acquisition operation of the cordless telephone master unit 3a (main control station). To do. When the synchronization acquisition timer (St1) expires without the control signal detection unit 202 being able to detect the control signal from the cordless telephone base unit 3a (main control station) via the wireless unit 201, the synchronization processing unit 204 (Rt1) is activated, and the control signal transmission unit 203 starts transmission of the control signal to the intercom slave unit 2c (dependent station) or the wireless slave unit 4 (dependent station) via the wireless unit 201 at its own slot timing. By operating in this way, the doorphone slave unit 2c (subordinate station) and the wireless slave unit 4 (subordinate station) are synchronized with the doorphone master unit 2b (sub control station), so the cordless telephone master unit 3a (main control station) Although it is not synchronized with the wireless door phone system, the wireless door phone system can operate independently.

  Then, when the re-acquisition timer (Rt1) expires while the wireless doorphone system is operating alone, reception for stopping a single operation and receiving a control signal transmitted by the cordless telephone master unit 3a (main control station). Perform the action. That is, when the re-acquisition timer (Rt1) expires, the intercom master unit 2b stops transmitting the control signal, and the control signal transmitted by the cordless telephone master unit 3a (main control station) is transmitted in the same manner as when restarting or turning on the power. A reception operation for reception is performed, and an operation for acquiring synchronization with the main control station is resumed.

  As described above, when the synchronization with the cordless telephone master unit 3a (main control station) is established, the doorphone master unit 2b operates as a dependent station of the cordless telephone master unit 3a, and when the synchronization is not established, the control station of the wireless doorphone system Cordless telephone master unit until it becomes possible to service the entire radio system, such as when the re-acquisition timer (Rt1) expires and the operation for synchronization acquisition with the main control station is resumed. The synchronization acquisition of 3a (main control station) and the single operation of the door phone system are repeated.

  In the above-described operation, the value of the re-acquisition timer (Rt1) is gradually increased so that the time during which the doorphone slave unit 2c and the wireless slave unit 4 are within the doorphone range is gradually increased, so that the single operation time of the wireless doorphone system is increased. Can be lengthened.

  In the above operation, the value of the synchronization acquisition timer (St1) is gradually shortened to acquire the synchronization time of the cordless telephone master unit 3a (main control station), that is, the doorphone slave unit 2c (subordinate station) and the wireless slave unit 4 ( The independent operation time of the wireless doorphone system can be increased by gradually reducing the time outside the doorphone area by the dependent station.

  Next, the doorphone master unit 2b (sub control station) starts the synchronization acquisition operation of the cordless telephone master unit 3a (main control station), but finally the control signal from the cordless telephone master unit 3a (main control station) is sent. The operation in the case where it cannot be detected will be described.

  As shown in FIG. 5, first, the synchronization processing unit 204 places the wireless unit 201 in a continuous reception state, and starts the synchronization acquisition operation of the cordless telephone master unit 3a (main control station). At this time, the synchronization acquisition timer (St1) is started. When the synchronization acquisition timer (St1) expires without the control signal detection unit 202 being able to detect the control signal from the cordless telephone base unit 3a (main control station) via the wireless unit 201, the synchronization processing unit 204 receives the re-acquisition counter. Check whether (Rcnt) has reached the maximum re-capture value (MaxRcnt).

The reacquisition counter (Rcnt) is a counter that is added and stored in an EEPROM or the like before the own apparatus is restarted when the reacquisition timer (Rt1) expires, and the reacquisition maximum value (MaxRcnt) Is the maximum number of times of re-acquisition. Until the re-acquisition counter (Rcnt) reaches the maximum value of re-acquisition (MaxRcnt), the intercom master unit 2b (sub control station) is cordless telephone master unit 3a (main control) Station). If the reacquisition counter (Rcnt) has not reached the maximum reacquisition value (MaxRcnt), the synchronization processing unit 204 activates the reacquisition timer (Rt1), and transmits the radio unit to the control signal transmission unit 203 at its own slot timing. A control signal is started to be transmitted to the doorphone slave unit 2c (subordinate station) and the radio slave unit 4 (subordinate station) via 201.

  If the reacquisition counter (Rcnt) has reached the maximum reacquisition value (MaxRcnt), the synchronization processing unit 204 does not start the reacquisition timer (Rt1) and transmits the radio signal to the control signal transmission unit 203 at its own slot timing. The control signal is started to be transmitted to the door phone slave unit 2c (dependent station) and the wireless slave unit 4 (dependent station) via the unit 201. By operating in this way, the doorphone slave unit 2c (subordinate station) and the wireless slave unit 4 (subordinate station) are synchronized with the doorphone master unit 2b (sub control station), so the cordless telephone master unit 3a (main control station) However, the radio doorphone system continues to operate alone.

  Next, the doorphone master unit 2b (sub control station) completely stops the synchronization acquisition of the cordless telephone master unit 3a (main control station), and the doorphone slave unit 2c is in a state where the wireless doorphone system continues to operate independently. The operation when a re-acquisition request is requested from the (subordinate station) or the wireless slave unit 4 (subordinate station) will be described.

  As shown in FIG. 5, when the intercom base unit 2b (sub control station) completely stops the synchronization acquisition of the cordless telephone base unit 3a (main control station), and the wireless intercom system is operating independently. When the synchronization acquisition restart request is input by the user operation of the doorphone slave unit 2c (subordinate station) or the radio slave unit 4 (subordinate station), the doorphone slave unit 2c (subordinate station) or the radio slave unit 4 (subordinate station) is wireless. Send a link connection request. When the data receiving unit 206 of the intercom base unit 2 b (sub control station) receives the wireless link connection request via the wireless unit 201, it outputs the wireless link connection request to the control unit 205. When the wireless link connection request is input from the data receiving unit 206, the control unit 205 connects the wireless link. Thereafter, the doorphone slave unit 2c (subordinate station) or the radio slave unit 4 (subordinate station) transmits a reacquisition request using the radio link.

  When the data reception unit 206 of the intercom base unit 2 b (sub control station) receives the recapture request via the wireless unit 201, it outputs the recapture request to the control unit 205. When a re-acquisition request is input from the data receiving unit 206, the control unit 205 causes the synchronization processing unit 204 to clear the re-acquisition counter (Rcnt) and performs a restart process of the own device. By operating in this way, the doorphone master unit 2b (sub station) can be operated by the operation from the door phone slave unit 2c (subordinate station) or the radio slave unit 4 (subordinate station) without turning on the power of the doorphone master unit 2b (sub control station) again. The sub control station) resumes the synchronization acquisition of the cordless telephone master unit 3a (main control station).

  As described above, in the present embodiment, an example in which the cordless telephone base unit is the main control station of the entire wireless communication system and the doorphone base unit is the sub control station of the entire wireless communication system has been described. The control station and door phone master unit may be used as the main control station.

  Further, in the present embodiment, one slave phone, one cordless telephone slave, and one wireless slave are provided as subordinate stations. However, a plurality of doorphone slaves, cordless telephone slaves, and wireless slaves are provided. May be provided.

(Embodiment 2)
FIG. 6 shows a hardware configuration for realizing the intercom master unit 2b which is a sub control station.

  The entrance cordless handset 2a and the door phone master phone 2b are a video signal of a visitor received from the entrance cordless handset 2a, a conversation voice signal with the visitor through the entrance cordless handset 2a, and a notification signal of the visitor received from the entrance cordless handset 2a. Are connected by a demultiplexing circuit which is an electrical interface composed of transistors and the like for separating and superimposing them.

  The hardware configuration of this demultiplexing circuit includes a doorphone interface 1001, and a video demodulation IC 1002 that converts a video signal between the door phone 2a and the doorphone master 2b output from the doorphone interface 1001 into an analog video signal used in the subsequent stage. A video capture IC 1003 that converts an analog signal of the video demodulation IC into a digital video signal, an SDRAM 1006 that stores the digital video signal, a V850 CPU 1005 that is a CPU that manages recording and reproduction of the digital video signal, and a program of the V850 CPU 1005 These are the FRAS ROM 1007 and the memory SRAM 1008 used when the V850 CPU 1005 program operates.

  In addition, in order to have a conversation between a visitor of the entrance cordless handset 2a and a user of the doorphone master set 2b, an analog signal communicated by a two-wire signal such as a telephone as an interface signal with the entrance cordless handset 2a side. A 2-4 conversion circuit 1009 converts a signal and an analog signal of a 4-wire signal used by the voice switch IC 1009 and the baseband IC 1011 for wireless communication that constitute the doorphone master unit communication unit 210 of the doorphone master unit 2b. Is going.

  The intercom base phone call unit 210 includes a microphone 1015 and a speaker 1016. The voice uttered on the master side is output from the microphone 1015 to the voice switch 1009. The voice uttered by the entrance cordless handset 2a is amplified by the speaker amplifier circuit 1010 from the voice switch 1009 and reproduced by the speaker 1016. A voice switch 1009 constituting a part of the audio circuit 206 is mounted to compare the volume from the microphone with the volume to the speaker and switch between transmission and reception.

  The main CPU 1017 detects that the control unit 205 has received a signal from the front door 2a. When the main CPU 1017 detects a call, the notification unit 208 blinks the LED 1017 to notify the visit. In response to this, when the doorphone master unit operation unit 209 is operated on the side of the doorphone master unit, the main CPU 1017 detects this and controls the whole so that a voice call can be made.

  When an analog image signal is input from the entrance cordless handset 2a to the video capture IC 1003, the video capture IC 1003 uses the SRAM 1006 to convert the analog image signal into a digital image signal.

  Further, the V850 CPU 1005 realizes functions such as recording a digital image signal and adding time information to the digital image signal using time information of the clock timer 1004. This is realized by the V850 CPU 1005 executing the program stored in the FLASH ROM 1007 using the SRAM 1008.

  The signal generated by the V850 CPU 1005 is output to the baseband IC 1011 for output to the cordless telephone handset 3b.

  In addition, an image of a visitor from the entrance cordless handset 2a is displayed on the LCD panel 1020 using the LCD driver IC 1019 as the notification unit 208.

The baseband IC 1011 includes a part of the control unit 205, a control signal detection unit 202, a control signal transmission unit 203, a synchronization processing unit 204, a data reception unit 207, and a data transmission unit 208. The baseband IC 1011 adds a synchronization signal necessary for TDMA-TDD communication and an error detection code for error detection to audio information, image information, control signals, etc., and transmits transmission data in accordance with TDMA frames and time slots. Generates a sequence, performs error detection processing from the received data sequence received in accordance with the TDMA frame and time slot, and outputs the voice information and control signal received in the time slot without error .

  The FLASH ROM 1012 realizes storage of programs executed by the baseband IC 1011.

  Further, the SRAM 1013 realizes a memory used when the baseband IC 1011 executes a program. Further, in wireless communication between the doorphone master unit and the extension master unit, ID information for the extension master unit to identify the master unit is stored in the EEPROM 1014.

  The transmission / reception unit 201 modulates and amplifies an input data string, amplifies and demodulates a received radio signal, and outputs received data. A radio IC 1015 that performs radio transmission / reception of TDMA scheme using frequency hopping and a plurality of antennas This is realized by a switch 1016 for switching between.

  An external view of the door phone master unit 2b is shown in FIG.

  On the front face of the door phone master unit 2b, there are an LCD panel 1020 for displaying an image of a visitor of the entrance cordless handset 2a, a key matrix switch 1018, and an LED 1017 for displaying the visit with light. Moreover, it has the microphone 1015 and the speaker 1016 for calling with the visitor of the entrance cordless handset 2a.

  With this configuration, a visitor can talk with a user in the room using the entrance cordless handset 2a. Further, the cordless telephone cordless handset 3b can have a voice conversation with the entrance cordless handset 2a.

  In a wireless communication system in which wireless communication systems that provide different services are connected wirelessly, when the system failure occurs due to a wireless error, the present invention recovers from the system failure without impairing the convenience of each service. Therefore, it is suitable for a radio communication system that performs time division multiplex communication between a plurality of control stations and dependent stations.

Configuration diagram of radio communication system according to an embodiment of the present invention The block diagram of the radio | wireless door phone system which concerns on embodiment of this invention The sequence diagram explaining operation | movement of the radio | wireless communications system which concerns on embodiment of this invention The sequence diagram explaining operation | movement of the radio | wireless communications system which concerns on embodiment of this invention The sequence diagram explaining operation | movement of the radio | wireless communications system which concerns on embodiment of this invention The figure which shows the hardware constitutions of the doorphone main | base station of the radio | wireless communications system which concerns on embodiment of this invention 1 is an external view of a door phone master unit of a wireless communication system according to an embodiment of the present invention. The figure which shows the constitution with cordless telephone system and wireless door phone system

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wireless communication system 2 Wireless door phone system 2a Door cordless handset 2b Door phone master phone 2c Door phone cordless handset 3 Cordless telephone system 3a Cordless phone cordless handset 3b Cordless phone cordless handset 4 Wireless cordless handset 101 Door phone call detection part 102 Door phone call part 201 Radio part 202 Control signal detection unit 203 Control signal transmission unit 204 Synchronization processing unit 205 Control unit 206 Data reception unit 207 Data transmission unit 208 Notification unit 209 Doorphone base unit operation unit 210 Doorphone base unit call unit

Claims (2)

A first device operating as a main control station or a sub-control station subordinate to the main control station;
A second device operating as a main control station;
A third device operating as a dependent station,
The first device transmits a first control signal based on time division multiplex communication at a first timing, the second device transmits a second control signal based on time division multiplex communication, and the third device. Is a wireless communication system that performs mutual wireless communication by receiving the first and second control signals,
The second device transmits the second control signal at a second timing;
The first device includes:
An operation as a sub-control station that transmits the first control signal in synchronization with the second timing by receiving the second control signal transmitted by the second device;
A synchronization acquisition timer is started when a reception operation of the second control signal transmitted by the second device is started ;
A main control station that starts the reacquisition timer when the synchronization acquisition timer expires without being able to synchronize with the second apparatus and transmits the first control signal at its first timing until the reacquisition timer expires Communicate with the third device by performing the operation as
When the reacquisition timer expires, add a reacquisition counter;
When the reacquisition counter reaches the maximum value, the reacquisition timer is not started and the operation as the main control station that transmits the first control signal at its first timing is performed to communicate with the third device. And
The first control signal at the first timing when a synchronization acquisition restart request is made by the third device in a state where the operation as the main control station cannot be synchronized with the second device. The wireless communication system is characterized in that the transmission operation is stopped and the reception operation for receiving the second control signal transmitted by the second device is performed. A first device operating as a main control station or sub-control station;
Consists of a third device operating as a dependent station,
The first device transmits a first control signal by time division multiplex communication at a first timing;
A wireless communication device in which the third device performs mutual wireless communication by receiving the control signal;
The first device includes:
A radio unit for transmitting and receiving radio signals;
A frame processing unit that performs time-division multiplexing control of a transmission signal;
By receiving the second control signal transmitted at a second timing by another device operating as a main control station, the first control signal is transmitted in synchronization with the second timing, and the third control signal is transmitted. As a sub-control station that communicates with other devices,
A synchronization acquisition timer is started when the reception operation of the second control signal transmitted by the other device is started ;
As a main control station that starts the reacquisition timer when the synchronization acquisition timer expires without being synchronized with the other device and transmits the first control signal at its first timing until the reacquisition timer expires To communicate with the third device ,
When the reacquisition timer expires, add a reacquisition counter;
When the reacquisition counter reaches the maximum value, the reacquisition timer is not started and the operation as the main control station that transmits the first control signal at its first timing is performed to communicate with the third device. And
When a synchronization acquisition restart request is made by the third device when it cannot synchronize with the other device, the transmission of the first control signal at the first timing is stopped, and the second device transmits A wireless communication apparatus that performs a receiving operation for receiving the second control signal.

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