JP6055431B2 - Cordless telephone device and wireless communication method - Google Patents

Description

  The present invention is a radio communication system using a radio communication system of a TDMA (Time Division Multiple Access) / TDD (Time Division Duplex) system suitable for application to a digital cordless telephone. The present invention relates to a communication device and a wireless communication method.

  In Japan, the digital cordless telephone standard T101 was established in 2011 by the Association of Radio Industries and Businesses (ARIB), which includes the technical content of the DECT (Digital Enhanced Cordless Telecommunication) standard. .

  In the DECT standard for digital cordless telephones, the communication method for transmission from the parent device to the child device is a time division duplex method using the time division multiplexing method, and transmission from the child device to the parent device is performed. In this case, the communication method is a time division duplex method using a time division multiple access method, the frequency uses a 1.9 GHz band different from the conventional cordless telephone (2.4 GHz), and the number of channels is maximum. It is determined that there are 5 channels.

  In the DECT standard, one frame in one channel of encoded data is composed of 24 slots as shown in FIG. 9A, and 12 slots S0 to S11 of the first half frame are Are used for the downlink from the parent device to the child device, and the 12 slots S12 to S23 of the latter half frame are used for the uplink from the child device to the parent device. Each slot has a configuration in which an A field for transmitting control data, a B field for transmitting audio data, and the like are provided (see, for example, Patent Document 1 (Japanese Patent Laid-Open No. 2001-510972)).

JP 2001-510972 A

  As described above, one frame of encoded data in the DECT standard (system) consists of 24 slots. As shown in FIG. 9B, each slot includes an S field, an A field, a B field, an X field, It consists of a protective space. The S field is a 32-bit area for synchronized data transmission, and the A field is a 64-bit area for control data transmission. The B field is a 320-bit area for audio data transmission, and the X field is a 4-bit area for parity check. A 60-bit protection space is provided after the X field.

  As described above, each slot includes an S field, an A field, a B field, an X field, and a protection space, and the use of each field is determined. For example, control data for lamp display such as LED (Light Emitting Device) from the master unit to the slave unit of a digital cordless telephone and control data such as incoming notification are transmitted using the A field. Of course, various control data from the slave unit to the master unit is also transmitted using the A field.

  For this reason, when a digital cordless telephone is used in a so-called business phone system constructed in an office or the like, it is conceivable that control data such as a lamp display sent from the main apparatus increases. In such a case, since the A field of each slot has only 64 bits, it is considered that the transmission speed can be secured only about several kbps, and it may take time to transmit control data. In this case, if the transmission source of the control data is the parent device and the transmission destination is the child device, there is a possibility that the necessary control in the child device may not be performed in a timely manner. It is necessary to correspond to.

In view of the above, the present invention transmits control data without delay in a cordless telephone apparatus using a TDMA / TDD wireless communication standard, and responds to the control data in a transmission (transmission) destination device. The purpose is to enable control to be executed at an appropriate timing.

In order to solve the above-described problem, a cordless telephone device according to claim 1 is provided.
A master unit and a slave unit, and between the master unit and the slave unit, a first field for control data transmission and a second field for voice data transmission having a data length longer than the first field; A cordless telephone apparatus using a wireless communication system of TDMA (Time Division Multiple Access) / TDD (Time Division Duplex) system,
The base unit is
A call line is connected between the partner and the slave unit by receiving a response sent from the partner in response to sending a call start request from the slave unit to the partner of the call. A call termination request from the slave unit is received in response to the transmission of a call termination request from the slave unit to the destination, First call state determination means for determining that it is a non-call state that is in a released state;
Based on the determination result of the first call state determination means, control data is transmitted using the first field and the second field is used for the call state, which is a state where the call line is connected. First transmission control means for controlling to transmit control data using at least the second field in the non-call state in which the voice data is transmitted and the call line is released. ,
The slave is
When receiving a response from the parent device in response to forming a call start request to the other party of the call and transmitting it to the parent device when an operation for instructing outgoing is received, When it is determined that the call state is a state in which a call line is connected to the own device and an operation for instructing to release the call line is accepted, a call end request is formed and A second call state determining means for determining that it is in a non-call state that is a state in which the call line is released by receiving a response from the base unit in response to the transmission;
Based on the determination result of the second call state determination unit, control data is extracted from the first field and voice data is extracted from the second field in the call state in which the call line is connected. And a first reception control means for controlling to extract and process control data from at least the second field in the non-call state in which the call line is released. It is characterized by providing.

According to the wireless communication system of the first aspect of the present invention, the first field for control data transmission and the voice data transmission longer than the first field are transmitted between the parent device and the child device. The data transmission is performed in a transmission unit having the second field. In addition, a configuration using a TDMA / TDD wireless communication method (standard) is provided between the parent device and the child device. And in the main | base station , the 1st transmission control means is provided. Then, the operation state of the own device is determined through the first call state determination unit, and based on the determination result, the first transmission control unit controls the transmission method of the control data and the like .

Specifically, when the first call state determination unit determines that the operation state of the own device is a call state in which a call line is connected between the partner and the slave unit , the first transmission control unit Controls to transmit control data using the first field and transmit voice data using the second field. On the other hand, when the first call state determination unit determines that the operation state of the own device is in the non-call state , which is a state where the call line is released , the first transmission control unit includes at least the second field. Is used to control to transmit control data.

On the other hand, in the slave unit, the operation state of the own unit is determined through the second call state determination unit, and based on the determination result, the first reception control unit controls how to process the received control data and the like. To do.

Specifically, when the second call state determination unit determines that the operation state of the own device is a call state in which a call line is connected between the partner and the own device , the first reception control is performed. The means controls to extract control data from the first field and extract voice data from the second field for processing. On the other hand, when the second call state determination unit determines that the operation state of the own device is a non-call state in which the call line is released, the control data is extracted from at least the second field. Control to process.

As described above, when the parent device that is the transmission data source determines that the own device is not in a call state, the call voice does not exist, so the voice data having a data length longer than that of the first field. Control data is transmitted using the second field for transmission. On the other hand, when it is determined that the slave unit that is the transmission data reception destination is not in a call state, the slave unit extracts control data from the second field of the received transmission data and performs control according to the extracted control data. I do. Thus, when not in a call state, the control data can be efficiently transmitted (transmitted) without causing a control data transmission delay, and control according to the transmitted control data is performed at the control data transmission destination. You can do it at the right time.

According to the present invention, control data can be transmitted without delay in a cordless telephone apparatus using a TDMA / TDD wireless communication system. And in the apparatus of the transmission destination of the said control data, the control according to the received said control data can be performed at an appropriate timing.

It is a block diagram which shows the example of a whole structure of the telephone system 10 of embodiment. It is a block diagram which shows the structural example of main | base station BS1. It is a block diagram which shows the structural example of the subunit | mobile_unit HS1. It is a figure for demonstrating the usage example of the slot transmitted to a subunit | mobile_unit from a main | base station. It is a figure for demonstrating the other usage example of the slot at the time of a non-call. It is a sequence diagram for demonstrating the specific example of the transmission sequence of the slot between the main | base station BS and the subunit | mobile_unit HS. It is a flowchart for demonstrating the process of the main | base station BS. It is a flowchart for demonstrating the process of the subunit | mobile_unit HS. It is a figure for demonstrating the structure of the flame | frame and slot of a DECT specification.

Hereinafter, an embodiment of a cordless telephone device and a wireless communication method of the present invention will be described with reference to the drawings. In the embodiments described below, a case where the present invention is applied to a telephone system called a business phone formed in offices of various companies will be described as an example.

[Configuration example of wireless communication system]
FIG. 1 is a block diagram showing an example of the overall configuration of a telephone system 10 according to this embodiment . In the telephone system 10 of this example, a plurality of cordless telephone devices 21, 22,..., 2n (n is an integer of 2 or more. The same) is connected. Each of the cordless telephone devices 21 to 2n is an example of a cordless communication device. Each of the base sets BS1, BS2,..., BSn as a parent device and each of the handsets HS1, HS2,. Each of the parent devices BS1 to BSn and each of the child devices HS1 to HSn are wirelessly connected.

  A plurality of slave units can be wirelessly connected to each of the master units BS1 to BSn. However, in this example, one slave unit is connected to one master unit. It is set as the structure. Although not shown in the figure, as an extension telephone apparatus connected to the main apparatus 1, not only cordless telephone apparatuses 21, 22,..., 2n but also a digital button telephone terminal can be connected in the same manner as a normal business phone. It is also possible to do.

  In this embodiment, the wireless connection between each of the parent devices BS1 to BSn of the cordless telephone devices 21 to 2n and each of the child devices HS1 to HSn conforms to the DECT standard (method) of the above-described digital cordless phone. This is performed by the TDMA / TDD method used.

  The main apparatus 1 can accommodate one or a plurality of telephone lines L1 to Lm (m is an integer of 1 or more). Then, the respective parent devices BS1 to BSn of the cordless telephone devices 21 to 2n are connected to the main device 1. In the example of FIG. 1, the parent devices BS1 to BSn and the main device 1 are connected by wire, but may be wireless.

  The main device 1 performs call control and circuit switching control for the plurality of cordless telephone devices 21 to 2n, and other business phone control, and supplies a reference synchronization signal SYNC to each of the plurality of cordless telephone devices 21 to 2n. It has a function. In this example, the reference synchronization signal SYNC is a signal having a period of 130 milliseconds (ms).

  Each of the base units BS1 to BSn of the cordless telephone apparatuses 21 to 2n is synchronized with the reference synchronization signal SYNC from the main apparatus 1, and is one frame (10 milliseconds (ms) which is a unit communication period of the DECT standard digital cordless telephone. )) A frame synchronization signal as a synchronization signal is generated, and based on the generated frame synchronization signal, TDMA / TDD wireless communication using the DECT standard is executed between the slave units HS1 to HSn. . Therefore, all of the plurality of cordless telephone apparatuses 21 to 2n operate in synchronization with the reference synchronization signal SYNC from the main apparatus 1.

  Each of base units BS1 to BSn generates a frame synchronization signal based on reference synchronization signal SYNC, and based on the generated frame synchronization signal, a plurality of one frame periods are transmitted to slave units HS1 to HSn. Control is performed so that wireless communication is performed using one of the slots, for example, every other slot.

[Configuration example of cordless telephone device]
Each of the parent devices BS1 to BSn and the child devices HS1 to HSn of the plurality of cordless telephone devices 21 to 2n has the same configuration. Therefore, in the following description, a configuration example of the parent device and the child device will be described taking the case of the parent device BS1 and the child device HS1 of the cordless telephone device 21 as an example.

<Example of configuration of base unit; FIG. 2>
FIG. 2 is a block diagram showing a configuration example of the base unit BS1. As shown in FIG. 2, the base unit BS1 includes a control circuit 41 for controlling the entire base unit BS1, a line LSI unit 42, a synchronization signal generation circuit 43, a wireless communication circuit 44, an oscillator 45, and 46.

  The control circuit 41 is configured by mounting a computer. The control circuit 41 has a function of performing control such as call control in the base unit BS1. The line LSI unit 42 is a circuit for exchanging audio signals, control signals, and synchronization signals with the main apparatus 1, and includes a division / multiplexing processing unit 421, a control signal processing unit 422, and an audio signal. The processing unit 423 includes a synchronization signal detection unit 424 and a PLL (Phase locked Loop) unit 425.

  The PLL unit 425 is supplied with the oscillation signal of the reference frequency from the oscillator 45 and the multiplexed signal from the main device 1. In this example, the frequency of the oscillation signal of the oscillator 45 is, for example, 2048 MHz (0.488 nanoseconds (ns)).

  The PLL unit 425 extracts the component of the clock signal CK from the timing signal generation unit of the main device 1 from the multiplexed signal from the main device 1 by so-called self-clocking, and the extracted clock signal CK component and the oscillator 45 The system clock signal SCK of the base unit BS1 synchronized with the clock signal CK component is generated from the oscillation signal of the oscillator 45 based on the comparison result.

  Then, the PLL unit 425 sends the generated system clock signal SCK to each of the division / multiplexing processing unit 421, the control signal processing unit 422, the audio signal processing unit 423, and the synchronization signal detection unit 424 as a signal processing clock signal. At the same time, it is supplied to the synchronization signal generation circuit 43.

  The division / multiplexing processing unit 421 is connected to the main apparatus 1 and is also connected to the control signal processing unit 422, the audio signal processing unit 423, and the synchronization signal detection unit 424. Then, the division / multiplexing processing unit 421 divides the control signal, the audio signal, and the reference synchronization signal SYNC from the multiplexed signal from the main device 1, and the control signal is sent to the control signal processing unit 422, and the audio signal is sent to the audio signal. The reference synchronization signal SYNC is supplied to the signal processing unit 423 and the synchronization signal detection unit 424, respectively.

  Further, the division / multiplexing processing unit 421 generates a multiplexed signal by multiplexing the control signal from the control signal processing unit 422 and the audio signal from the audio signal processing unit 423, and the generated multiplexed signal Is supplied to the main apparatus 1.

  The control signal processing unit 422 is connected to the control signal input / output terminal of the control circuit 41, and is also connected to the division / multiplexing processing unit 421. This is a processing circuit for control signals such as control signals (both control signals from the main apparatus 1 to the cordless telephone apparatus 21 and control signals from the cordless telephone apparatus 21 to the main apparatus 1).

  The audio signal processing unit 423 is connected to the wireless communication circuit 44 and is also connected to the division / multiplexing processing unit 421, and the received voice signal received from the handset HS 1 from the wireless communication circuit 44 and the divided / multiplexed 6 is a processing circuit for a transmission voice signal from the multiplexing processing unit 421;

  The synchronization signal detection unit 424 receives the reference synchronization signal SYNC from the division / multiplexing processing unit 421, detects a predetermined synchronization signal pattern included in the reference synchronization signal SYNC, and as a signal at the time of detection, A reference synchronization pulse PS having the same period (130 ms) as the reference synchronization signal SYNC is generated in synchronization with the reference synchronization signal SYNC. Then, the synchronization signal detection unit 424 supplies the generated reference synchronization pulse PS to the synchronization signal generation circuit 43.

  The synchronization signal generation circuit 43 includes a counter 431 and a synchronization signal generation unit 432. The counter 431 is supplied with the reference synchronization pulse PS having a period of 130 ms from the synchronization signal detection unit 424 of the line LSI unit 42 to the preset terminal and the system clock signal SCK from the PLL unit 425 as a count input. . Then, the output count value CNT of the counter 431 is supplied to the synchronization signal generator 432.

  The synchronization signal generation unit 432 generates a synchronization signal FL having a DECT standard frame period (10 ms) from the output count value CNT of the counter 431. The synchronization signal generation circuit 43 supplies the frame synchronization signal FL generated by the synchronization signal generation unit 432 to the wireless communication circuit 44.

  Next, the wireless communication circuit 44 will be described. In this embodiment, the wireless communication circuit 44 uses a general-purpose wireless communication LSI for a parent device for performing DECT standard wireless communication. The wireless communication circuit 44 includes a control unit 441, a TDMA modulation / demodulation unit 442, and a wireless communication unit 443. The wireless communication unit 443 is a circuit unit for performing wireless communication with the child device HS1.

  The control unit 441 is connected to the TDMA modulation / demodulation unit 442 and the wireless communication unit 443 and also connected to the control circuit 41. The control unit 441 controls the overall operation of the wireless communication circuit 44 and supplies a control signal based on the control signal obtained from the control circuit 41 to the TDMA modulation / demodulation unit 442.

  The TDMA modulation / demodulation unit 442 is connected to the control unit 441 and the audio signal processing unit 423 of the line LSI unit 42 and is also connected to the wireless communication unit 443, and from the control signal from the control unit 441 and the audio signal processing unit 423. Is modulated in order to transmit the audio signal to the slave unit HS1. The signal modulated by the TDMA modulation / demodulation unit 442 is transmitted to the slave unit HS1 through the wireless communication unit 443.

  The TDMA modulation / demodulation unit 442 demodulates the audio signal and the control signal from the received signal from the slave unit HS1 received by the wireless communication unit 443, and supplies the demodulated audio signal to the audio signal processing unit 423 for demodulation. The control signal is supplied to the control unit 441.

  The TDMA modulation / demodulation unit 442 includes a PLL unit 4421 for generating a clock. The PLL unit 4421 is supplied with the oscillation signal from the oscillator 46 and the frame synchronization signal FL from the synchronization signal generation circuit 43.

  The PLL unit 4421 compares the phase of the frame synchronization signal FL from the synchronization signal generation circuit 43 with the oscillation signal from the oscillator 46, and synchronizes the frame synchronization signal FL from the oscillation signal of the oscillator 46 based on the comparison result. A timing signal and a clock signal are generated.

  The TDMA modulation / demodulation unit 442 uses the timing signal and the clock signal synchronized with the frame synchronization signal FL to generate a transmission signal to the slave unit HS1 in a period corresponding to one of the slots in the downlink that can be allocated and used. At the same time, the received signal from the slave unit HS1 is processed using one of the slots in the uplink.

  The base unit BS1 is connected to the main device 1 and starts the synchronization process for communication with the slave unit HS1 as described above, and always sends a transmission signal to the slave unit HS1. Then, the control unit 441 of the wireless communication circuit 44 of the base unit BS1 transmits the transmission signal generated by the TDMA modulation / demodulation unit 442 to the slave unit HS1 through the wireless communication unit 443 using one slot set in the base unit. When a response is returned from the slave unit HS1 when it is sent, the slot used for transmitting the transmission signal is synchronized for the downlink, and the slot that received the response from the slave unit HS1 is synchronized for the uplink. It establishes and it controls to perform transmission / reception.

<Example configuration of slave unit; Fig. 3>
FIG. 3 is a block diagram showing a configuration example of the slave unit HS1. As shown in FIG. 3, the slave unit HS1 includes a wireless communication circuit 51, a control circuit 52, a codec circuit 53, an oscillator 54, a microphone 55, and a speaker 56. The microphone 55 constitutes a transmitter, and the speaker 56 constitutes a receiver.

  The wireless communication circuit 51 uses a general-purpose wireless communication LSI for handset for performing DECT standard wireless communication. The wireless communication circuit 51 includes a control unit 511, a TDMA modulation / demodulation unit 512, and a wireless communication unit 513. The wireless communication unit 513 is a circuit unit for performing wireless communication with the parent device BS1.

  The control unit 511 is connected to the TDMA modulation / demodulation unit 512 and the wireless communication unit 513 and is also connected to the control circuit 52. The control unit 511 controls the overall operation of the wireless communication circuit 51 and supplies a control signal based on the control signal obtained from the control circuit 52 to the TDMA modulation / demodulation unit 512.

  The TDMA modulation / demodulation unit 512 is connected to the control unit 511 and the wireless communication unit 513 and is also connected to the codec circuit 53, and transmits the control signal from the control unit 511 and the audio signal from the codec circuit 53 to the base unit BS1. To do modulation. The signal modulated by TDMA modulation / demodulation unit 512 is transmitted to base unit BS1 through radio communication unit 513.

  The TDMA modulation / demodulation unit 512 demodulates the audio signal and the control signal from the received signal from the base unit BS1 received by the wireless communication unit 513, supplies the demodulated audio signal to the codec circuit 53, and demodulates the control signal. Is supplied to the control unit 511.

  The TDMA modulation / demodulation unit 512 includes a PLL unit 5121 for clock generation. The PLL unit 5121 is supplied with the oscillation signal from the oscillator 54 and the demodulated signal of the reception signal from the wireless communication unit 513. The PLL unit 5121 receives the oscillation signal from the oscillator 54. A clock signal synchronized with the clock component of the demodulated signal is generated. The clock signal from the PLL unit 5121 is used as a processing clock signal in the TDMA modulation / demodulation unit 512.

  The codec circuit 53 decodes the audio signal demodulated by the TDMA modulation / demodulation unit 512, converts the audio signal into an analog audio signal, supplies the analog audio signal to the speaker 56, and emits the received audio as received audio. The codec circuit 53 encodes the analog audio signal collected by the microphone 55 and supplies the encoded analog audio signal to the TDMA modulation / demodulation unit 512.

  The control circuit 52 transmits a call control signal at the time of calling from the child device HS1 to the parent device BS1 through the wireless communication circuit 51, and also a call control signal at the time of arrival from the parent device BS1. When receiving, processing such as emitting a ringtone from the speaker 56 is performed.

  The above description is for the base unit BS1 and the handset HS1 of the cordless telephone device 21, but as described above, the base units BS2 to BSn and handset HS2 to HSn of the other cordless phone devices 22 to 2n. Have the same configuration.

[Specific slot usage example]
Next, DECT standard encoded data transmitted between the parent devices BS1, BS2,..., BSn and the child devices HS1, HS2,..., HSn constituting the cordless telephone apparatus (wireless communication system) described above is formed. A specific usage example of the slot to be used will be described. In the following, parent devices BS1, BS2,..., BSn are collectively referred to as parent device BS, and child devices HS1, HS2,..., HSn are collectively referred to as child device HS.

  As shown in FIG. 9A, in the encoded data of the DECT standard, one frame is composed of 24 slots. As shown in FIG. 9B, one slot basically includes an S field for synchronized data transmission, an A field for control data transmission, a B field for audio data transmission, and a parity. It consists of a check X field and a protection space.

  In one or both of the master unit BS and the slave unit HS of this embodiment, the way of using each slot is made different during a call and during a non-call. In this way, necessary control data is transmitted during a call while preventing the call from being hindered. On the other hand, at the time of non-calling, for example, even if control data to be transmitted increases due to frequent occurrence of control data, all necessary control data is transmitted without delaying all control data To do. Hereinafter, a usage example of the slot will be specifically described.

  As described above, the present invention is characterized in that, in one or both of the parent device BS and the child device HS, the way of using each slot is different depending on whether or not a call is made. However, here, in order to simplify the description, a case will be described in which, in the base station BS, how to use each slot is different between when calling and when not calling.

  FIG. 4 is a diagram for explaining an example of the use of slots transmitted from the base unit BS to the handset HS of the cordless telephone apparatus according to this embodiment. FIG. 4 (B) shows an example of use during non-calling. In the slot at the time of calling shown in FIG. 4A and the slot of the example of use at the time of non-calling shown in FIG. Aspect) is the same as that shown in FIG. That is, the S field transmits synchronization data, the X field transmits parity check data, and the protection space is a space for protection from adjacent slots.

  During a call, as shown in FIG. 4A, control data is transmitted using the A field and voice data is transmitted using the B field, as is conventional. The data length of the B field is a relatively large area of 320 bits, a transmission rate of 32 kbps can be secured, and a good call can be made. Further, since there is little control to be performed in real time during a call, appropriate control is possible by transmitting control data using the A field having a data length of 64 bits.

  On the other hand, since control data for various controls such as control data for lamp control may frequently occur during non-calling, the A field is not used as shown in FIG. The control data is transmitted using the B field. When there is no call, there is no call voice data. For this reason, since the 320-bit B field is unused, control data is transmitted using this B field. Here, the control data includes various header information related to the control data. Thereby, the control data can be transmitted at a transmission rate of 32 kbps during non-calling. Therefore, transmission of control data can be performed without delay, and control according to the received control data can be performed without delay in the slave unit HS that is the transmission destination of the control data.

  As described above, when the base station BS that is the slot transmission source is in a call state, the base station BS transmits control data in the A field and transmits voice data in the B field as shown in FIG. To do. Further, when the base station BS, which is the slot transmission source, is in a non-calling state, the control data is transmitted in the B field without using the A field as shown in FIG.

  On the other hand, the slave unit HS, which is the recipient of the slot, extracts control data from the A field when the own unit is in a call state, executes control according to the control data, and transmits voice data from the B field. Extract and process this. Further, the slave unit HS which is the reception destination of the slot extracts the control data from the B field and controls according to the control data because the A field is not used when the own unit is in a non-calling state. Execute.

  In this way, in the cordless telephone apparatus according to this embodiment, the necessary control data is also transmitted appropriately while making a call appropriately by using each slot in a conventional manner during a call. I can do it. During non-calling, the B field is used for transmission of control data, so that control data can be transmitted to the slave unit at high speed even if the control data increases. As a result, the transmission delay of the control data is prevented, and the slave unit HS that is the transmission destination of the control data can execute the control according to the received control data without delay.

[Other slot usage examples]
In the non-calling slot usage example shown in FIG. 4B, the A field is not used. However, it is also possible to use the A field in addition to the B field during non-calling. That is, necessary information may be transmitted using the A field while transmitting control data in the B field. FIG. 5 is a diagram for explaining another usage example of the slot at the time of non-calling.

  In another usage example 1 shown in FIG. 5A, in the A field, predetermined identification information (identification ID) indicating usage of the A field and the B field of the slot, and control data transmitted in the B field The so-called header information is transmitted. In this case, the identification ID indicates that header information related to control data is transmitted in the A field and control data is transmitted in the B field. The header information about the control data includes, for example, control data such as information indicating the data length of the control data, control data classification indicating what the control data relates to, identification information of the transmission source, identification information of the transmission destination, and transmission date and time. Various header information regarding is included. In the B field, only control data excluding header information is transmitted.

  In this way, in the device that has received the slot shown in FIG. 5A, the header information related to the control data is transmitted in the A field and the control data is transmitted in the B field according to the identification ID of the A field. Can be reliably determined. And the apparatus which received the said slot can use appropriately the control data transmitted by B field based on the header information about the control data transmitted by A field.

  In another usage example 2 shown in FIG. 5B, in the A field, an identification ID, header information related to control data transmitted in the slot, and a part of the control data are transmitted. Here, the identification ID is predetermined identification information indicating the usage mode of the A field and the B field of the slot, as in the example shown in FIG. Accordingly, the identification ID in this case indicates that the header information and a part of the control data are transmitted in the A field, and the remaining part of the control data is transmitted in the B field.

  The header information for the control data in the example shown in FIG. 5B includes information indicating the data length of the control data transmitted in the A field and information indicating the data length of the control data transmitted in the B field. Etc. Also in this case, for example, the A field is used for various header information about the control data such as the control data classification indicating what the control data relates to, the transmission source identification information, the transmission destination identification information, and the transmission date and time. Can also be transmitted.

  In the case of the other usage example 2 shown in FIG. 5B, the A field can also be effectively used. Also, the main control data that needs to be transmitted in real time is transmitted using the B field. For example, control data that is not used immediately but is to be transmitted to the slave unit in advance is the A field. It is also possible to properly use it by transmitting over time.

[Outline of processing between master unit and slave unit]
FIG. 6 is a sequence diagram for explaining a specific example of a transmission sequence of a slot between base unit BS and slave unit HS. Here, as an example, a case is included in which a call start is requested from the handset HS side, a call line is connected and a call is made, and then a call end is requested from the handset HS side to release the call line. I will explain.

  In the base unit BS, for example, the control unit 441 of the wireless communication circuit 44 manages the operation state of the base unit BS. When the base unit BS is not in a call, the TDMA modem unit 442 transmits control data using only the B field, for example, as described with reference to FIG. A slot for transmission is formed, and this is transmitted to the slave unit HS which is the transmission destination (steps ST1 and ST3).

  In the slave unit HS, for example, the control unit 511 of the wireless communication circuit 51 manages the operation state of the own unit. The slave unit that is the transmission destination of the slot receives the slot, and extracts control data from the B field of the slot received by the TDMA modulation / demodulation unit 512 according to the control of the control unit 511, and according to the control data Operates to control. In the slave unit, the control circuit 52 controls the control unit 511 of the wireless communication circuit 51 so as to send back a response indicating that the slot has been received. The control unit 511 controls the TDMA modulation / demodulation unit 512 to form a response (slot) indicating that the slot has been received, and returns this to the base unit through the wireless communication unit 513 (steps ST2 and ST4).

  In this case, since control data from the base station BS to the handset HS is transmitted using the B field of 320 bits, even if control data is frequently generated, all control data is transmitted without delay. Can be sent to the machine. Since the slave unit receiving the slot can receive the control data without delay, various controls including the control of the control data, for example, the lighting / extinguishing control of the lamp, are performed at an appropriate timing. You can do it. That is, control according to the control data provided from the master unit can be performed without delay.

  Then, it is assumed that the user of the slave unit HS inputs a call start request by performing an operation for instructing the slave unit to make a call to make a call to a target partner (step ST11). In the handset that has received the call start request, the control unit 511 of the wireless communication circuit 51 is controlled so that the control circuit 52 makes a call. As a result, control unit 511 controls TDMA modulation / demodulation unit 512 to form a call start request for the intended destination, and transmits this request to base station BS through radio communication unit 513 (step ST12). When receiving the call start request from the slave unit, the base unit BS controls the control unit 441 of the wireless communication circuit 44 so that the control circuit 41 returns a response. The control unit 441 controls the TDMA modulation / demodulation unit 442 to form a response (slot) indicating that the communication start request has been received, and returns this response to the slave unit through the wireless communication unit 443 (step ST13).

  In this case, the control circuit 41 of the base station BS transmits a call start request to the other party to the other party via the main apparatus 1, receives a response from the other party, and receives a call start request from the other party. A telephone line is connected to the original handset HS (step ST20) so that a telephone call can be made. Then, when the base unit becomes busy, the control unit 441 controls the TDMA modulation / demodulation unit 442 so that the control data uses the A field as described with reference to FIG. Forms a slot to be transmitted using the B field and transmits it to the slave unit (steps ST21 and ST23).

  The handset HS that is the transmission destination of the slot receives the slot, the control unit 511 controls the TDMA modulation / demodulation unit 512, extracts control data from the A field, and performs control according to the control data At the same time, the audio data is extracted from the B field and supplied to the codec circuit 53 for output processing. Also, in the slave unit HS, the control unit 511 controls the TDMA modulation / demodulation unit 512 so that the control data is transmitted using the A field and the voice signal from the codec circuit 53 is used using the B field, similarly to the slot from the master unit. A slot for transmitting data is formed and transmitted to the base station BS through the wireless communication unit 513 (steps ST22 and ST24).

  In this case, the control data is transmitted using the 64-bit A field in both the master unit and the slave unit. However, since the call is in progress, the control data to be reflected in real time is relatively small and generated. Control data can be properly transmitted to the other party. Further, since the call voice itself is transmitted using the 320-bit B field, the call voice (voice data) is appropriately transmitted, and the call is properly communicated with each other without causing inconvenience such as the call being interrupted. Can do.

  Thereafter, it is assumed that the user of the slave unit inputs a call termination request by performing an operation to instruct the slave unit to terminate the call and release the connected communication line (step ST31). In the handset that has received the call termination request, the control circuit 52 controls the control unit 511 of the wireless communication circuit 51 to form and transmit a call termination request. The control unit 511 controls the TDMA modulation / demodulation unit 512 to form a call termination request for the intended destination, and transmits this request to the base unit BS through the wireless communication unit 513 (step ST32).

  When receiving the call termination request from the slave unit, the master unit BS controls the control unit 441 of the wireless communication circuit 44 so that the control circuit 41 returns a response. The control unit 441 controls the TDMA modulation / demodulation unit 442 to form a response (slot) indicating that the communication end request has been received, and returns this response to the slave unit via the wireless communication unit 443 (step ST33).

The control circuit 41 of the base unit BS transmits the received call end request to the other party via the main device 1, receives a response from the other party, and receives the response from the other party and the child unit HS of the call end request source. The call line connected between the two is released (step ST40), and the call is terminated. When the base station BS is not in a call, the base station BS does not use , for example, the A field shown in FIG. 4B in the TDMA modulation / demodulation unit 442 according to the control of the control unit 441 as described above. Then, a slot for transmitting control data is formed using the B field, and this is transmitted to the slave unit HS which is the transmission destination (steps ST41, ST43, etc.). As described above, the slave unit HS that is the transmission destination of the slot operates to receive the slot, extract control data from the B field, and perform control according to the control data. Further, the slave unit HS forms a response indicating that the slot has been received, and returns this response to the master unit BS (steps ST42 and ST44).

  As described above, when a non-call is in progress, the base unit BS transmits control data using the B field of 320 bits. For this reason, as described above, even if the control data increases, the transmission to the control data is not delayed, and the slave unit HS that is the transmission destination of the control data performs control according to the provided control data. It can be executed at an appropriate time.

  Note that, here, as shown in FIG. 4B, the control data is transmitted using the B field without using the A field when not talking, but this is not a limitation. Absent. During non-calling, it is of course possible to form the slot shown in FIGS. 5A and 5B and transmit control data.

[Processing of base unit BS]
Next, the processing of the base unit BS of this embodiment will be summarized. FIG. 7 is a flowchart for explaining the processing of base unit BS of this embodiment. The flowchart shown in FIG. 7 is a process executed mainly in the control unit 441 of the radio communication circuit 44 of the parent device BS.

  In the base unit BS of this embodiment, when the power is turned on, the control unit 441 of the wireless communication circuit 44 executes the process shown in FIG. As described above, since the control unit 441 knows the operation state of the own device, the control unit 441 first determines the current operation state of the own device (step S101), and determines the determined current operation state of the own device. For example, it is stored and held in a predetermined memory of the control unit 441 (step S102). Then, the control unit 441 determines whether or not the current operation state of the own device determined this time is during a call (step S103).

  In the determination process of step S103, it is assumed that the control unit 441 determines that the operation state of the own device is a call. In this case, the control unit 441 controls the TDMA modulation / demodulation unit 442 so that its own operation mode is transmitted using the A field of each slot, and control data is transmitted using the B field. (Step S104). As a result, in the base unit BS, the slot having the mode described with reference to FIG. 4A is formed, and a process of transmitting to the slave unit is performed.

  Further, in the determination process in step S103, it is assumed that the control unit 441 determines that the operation state of the own device is not in a call (not in a call). In this case, the control unit 441 controls the TDMA modulation / demodulation unit 442 so that its own operation mode is a mode for transmitting control data using the B field of each slot (step S105). As a result, in the base station BS, the slot having the mode described with reference to FIG. 4B or FIGS. 5A and 5B is formed, and processing for transmitting to the slave unit HS is performed.

  After the process of step S104 or after the process of step S105, the control unit 441 determines the operation state of the own device again (step S106). Then, the control unit 441 compares the operation state determined this time with the operation state previously determined stored in the predetermined memory in step S102 to determine whether or not the operation state of the own device has changed ( Step S107). If it is determined in step S107 that the operation state has not changed, it is not necessary to change the operation mode, so the processing from step S106 is repeated.

  If it is determined in step S107 that the operating state has changed, the control unit 441 repeats the process from step S102. This is because the operation mode of the own device is changed according to the new operation state determined in step S106. Then, by the processing from step S102 to step S105, as described above, a transition is made to an appropriate operation mode depending on whether or not a call is in progress. As a result, even if the control data increases, the base unit BS can appropriately transmit the control data to the slave unit HS. In the slave unit HS, the control according to the control data provided from the master unit BS is performed. Can be executed at an appropriate time.

[Handling of handset HS]
As described above, the base station BS forms a slot in the manner shown in FIG. 4A according to whether it is busy or non-calling, or transmits the slot as shown in FIG. In FIG. 5 (A) and FIG. 5 (B), a slot is formed and transmission is switched. Whether a slot is formed and transmitted in the mode shown in FIG. 4B, or a slot is formed and transmitted in the mode shown in FIG. 5A or FIG. Is determined in advance.

  Then, the parent device BS and the child device HS constitute a pair, and the child device HS makes a call through the parent device BS. Therefore, when the child device HS is in a call, the corresponding parent device BS is also in a call, When the handset HS is not in a call, the corresponding base unit BS is also not in a call. As described above, the operation states of the base unit BS and the slave unit HS match. And also in the subunit | mobile_unit HS, the control part 511 of the radio | wireless communication circuit 51 grasps | ascertains the operation state of an own machine.

  For this reason, in the slave unit HS that receives the slot from the base unit BS, the slot provided from the base unit BS according to the mode of the slot formed in the base unit BS determined in advance and the operating state of the base unit BS The method of processing is determined. FIG. 8 is a flowchart for explaining the processing of the slave unit HS of this embodiment. The flowchart shown in FIG. 8 is processing executed mainly in the control unit 511 of the wireless communication circuit 51 of the slave unit HS.

  Also in the slave unit HS, when the power is turned on, the control unit 511 of the wireless communication circuit 51 executes the process shown in FIG. As described above, since the control unit 511 knows the operation state of the own device, the control unit 511 first determines the current operation state of the own device (step S201), and determines the determined current operation state of the own device. For example, it is stored and held in a predetermined memory in the control unit 511 (step S202). And a control part discriminate | determines whether the operation state of the own own apparatus discriminated this time is during a telephone call (step S203).

  In the determination process of step S203, the control unit 511 determines that the operation state of the own device is busy. In this case, since the corresponding base unit is also in a call, control data is transmitted in the A field of each slot and voice data is transmitted in the B field as usual. Therefore, the control unit 511 controls the TDMA modulation / demodulation unit 512 to extract the operation mode of the own device from the A field of each slot and use it for the control of the own device, and extract the audio data from the B field. Then, the mode is processed and output through the codec circuit 53 (step S204). As a result, the slot in the mode described with reference to FIG. 4A transmitted from the base station BS is appropriately processed, and control according to the control data and reproduction of the call voice are performed.

  Also, in the determination process of step S203, the control unit 511 determines that the operation state of the own device is not in a call (not in a call). In this case, the control unit 511 controls the TDMA modulation / demodulation unit 512 to extract the control data transmitted using the B field of each slot as the operation mode of the own device, and to perform control according to this mode. (Step S205). In this case, the base station BS determines in advance which of the modes in FIG. 4 (B), FIG. 5 (A), and FIG. In response to the control data, the control data is appropriately extracted and can be used for control.

  After the process of step S204 or after the process of step S205, the control unit 511 determines the operation state of the own device again (step S206). Then, the control unit 511 compares the operation state determined this time with the operation state previously determined stored in the predetermined memory in step S202 to determine whether or not the operation state of the own device has changed ( Step S207). If it is determined in step S207 that the operation state has not changed, it is not necessary to change the operation mode, so the processing from step S206 is repeated.

  If it is determined in step S207 that the operating state has changed, the control unit 511 repeats the process from step S202. This is because the operation mode of the own device is changed according to the new operation state determined in step S206. Then, by the processing from step S202 to step S205, as described above, a transition is made to an appropriate operation mode depending on whether or not a call is in progress. As a result, the slot from the base unit BS can be appropriately processed, the control according to the control data from the base unit BS can be appropriately executed, and the telephone call can also be appropriately performed as usual.

  Here, in the base station BS, when a call is in progress, a slot is formed and transmitted in the manner shown in FIG. 4 (A), and when a non-call is in progress, it is shown in FIG. 5 (A) or FIG. 5 (B). The processing of the slave unit HS when a slot is formed and transmitted in the manner shown will be summarized. In this case, in the slave unit HS, it is assumed that the control unit 511 of the wireless communication circuit 51 determines the operation state of the own device and determines that the operation state of the own device is not in a call.

  The control unit 511 controls the TDMA modulation / demodulation unit 512 to determine how the A field and the B field are used for the slot from the base unit based on the above-described identification ID of the A field. In response to this, processing is performed. That is, the identification ID stored in the A field indicates that the slot transmits the control data header information in the A field and the control data in the B field, as shown in FIG. Suppose. In this case, the control unit 511 of the wireless communication circuit 51 extracts header information about the control data from the A field, and extracts and uses the control data stored in the B field according to the header information.

  Further, as shown in FIG. 5B, the identification ID stored in the A field is the header information and part of the control data in the A field, and the remaining control data in the B field. Suppose that this indicates that a part is to be transmitted. In this case, the control unit 511 of the wireless communication circuit 51 extracts the header information about the control data from the A field, and the control data stored in the A field and the control stored in the B field according to the header information. Extract and use the data.

  Thus, in the case of this example, in the slave unit HS, the A field and the B field of each slot are properly used according to the operation state of the own unit and the identification ID of the received A field of the slot. Can be processed.

[Effect of the embodiment]
In the case of the cordless telephone apparatus according to the above-described embodiment, the base unit transmits control data using a B field of 320 bits that is not used because it is a transmission field for voice data when not in a call. . As a result, the transmission rate of control data during non-calling can be secured up to at least 32 kbp. Then, even if the control data increases, the transmission of control data can be prevented from occurring, and in the slave unit receiving the control data, the time corresponding to the control data from the master unit is not delayed. Lee can be executed. As a result, a more reliable cordless telephone device can be constructed.

[Modifications]
In the base unit BS of the above-described embodiment, the control unit 441 of the wireless communication circuit 44 grasps the operation state of the own device and discriminates the operation state of the own device whenever necessary. However, it is not limited to this. As described with reference to FIG. 2, the base unit BS includes a control circuit (CPU) 41 that controls each unit in accordance with control data from the main apparatus 1 and the slave unit HS. The control circuit 41 can also grasp the operation state of the own device and determine the operation state of the own device at an appropriate timing. Therefore, the control circuit 41 provided between the line LSI unit 42 and the wireless communication circuit 44 can be used as a means for determining the operation state of the own device.

  Similarly, as described with reference to FIG. 3, the slave unit HS includes a control circuit (CPU) 52 that controls each unit in accordance with control data from the master unit BS and an instruction input from the user. The control circuit 52 can also grasp the operation state of the own device and determine the operation state of the own device at an appropriate timing. For this reason, the control circuit 52 provided between the codec circuit 53 and the wireless communication circuit 51 can be used as means for determining the operation state of the own device.

  Further, in the above-described embodiment, the specific example of the slot usage mode during non-calling has been described with reference to FIGS. 4B, 5A, and 5B, but is not limited thereto. It is not a thing. Various modes using the B field, which is a voice data transmission field, can be used during non-calling. For example, as described with reference to FIG. 5B, two types of control data having different control contents can be transmitted in the A field and the B field during non-calling.

  In addition, since the B field of each slot in the above-described embodiment is a relatively large area of 320 bits, the B field can be divided into a plurality of areas, and the usage of each divided area can be defined in detail. .

  In the above-described embodiment, the case where the present invention is applied to the DECT standard cordless telephone apparatus using the TDMA / TDD wireless communication system has been described as an example. However, the present invention is not limited to this. The present invention can be applied to a wireless communication system using various transmission methods for transmitting data in a transmission unit of a predetermined bit length having an area for transmitting control data and an area for transmitting audio data.

  Further, in the above-described embodiment, with respect to the slot transmitted from the parent device BS to the child device HS, the usage of the field constituting the slot is changed depending on whether a call is in progress or not. This is because there is usually a large amount of control data to be provided from the parent device BS to the child device HS. However, it is not limited to this. As for the slot transmitted from the slave unit HS to the master unit BS, the use of the field constituting the slot may be changed between during a call and during a non-call in the same manner as in the case of the base unit BS described above. In this case, the slot from the slave unit HS may be processed in the master unit BS, as performed by the slave unit HS described above.

  Of course, in both the base unit BS and the handset HS, the mode shown in FIG. 4A is used during a call, and any one of FIGS. 4B, 5A, and 5B is used during a non-call. Of course, slots may be formed and transmitted in the manner shown in FIG.

[Others]
The functions of the first call state determination unit and the first transmission control unit in the base unit are realized by the control unit 441 of the radio communication circuit 44 of the base unit BS, and the second call state determination unit and the first transmission unit in the base unit BS . Each function of the reception control unit 1 is realized by the control unit 511 of the wireless communication circuit 51 of the slave unit HS.

The function of the second reception control means of the parent device is realized by the control unit 441 of the wireless communication circuit 44 of the parent device BS, and the function of the second transmission control means of the child device is the wireless communication of the child device HS . The control unit 511 of the circuit 51 is realized.

  In addition, the method described with reference to the sequence diagram of FIG. 6 and the flowcharts of FIGS. 7 and 8 is an application of the embodiment of the wireless communication method of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Main apparatus, 21-2n ... Cordless telephone apparatus, BS, BS1-BSn ... Master unit, HS, HS1-HSn ... Slave unit, 41 ... Control circuit, 44 ... Wireless communication circuit, 441 ... Control unit, 442 ... TDMA Modulator / demodulator, 443 ... wireless communication unit, 52 ... control circuit, 51 ... wireless communication circuit, 511 ... control unit, 512 ... TDMA modulation / demodulation unit, 513 ... wireless communication unit

Claims (6)

A master unit and a slave unit, and between the master unit and the slave unit, a first field for control data transmission and a second field for voice data transmission having a data length longer than the first field; A cordless telephone apparatus using a wireless communication system of TDMA (Time Division Multiple Access) / TDD (Time Division Duplex) system,
The base unit is
A call line is connected between the partner and the slave unit by receiving a response sent from the partner in response to sending a call start request from the slave unit to the partner of the call. A call termination request from the slave unit is received in response to the transmission of a call termination request from the slave unit to the destination, First call state determination means for determining that it is a non-call state that is in a released state;
Based on the determination result of the first call state determination means, control data is transmitted using the first field and the second field is used for the call state, which is a state where the call line is connected. First transmission control means for controlling to transmit control data using at least the second field in the non-call state in which the voice data is transmitted and the call line is released. ,
The slave is
When receiving a response from the parent device in response to forming a call start request to the other party of the call and transmitting it to the parent device when an operation for instructing outgoing is received, When it is determined that the call state is a state in which a call line is connected to the own device and an operation for instructing to release the call line is accepted, a call end request is formed and A second call state determining means for determining that it is in a non-call state that is a state in which the call line is released by receiving a response from the base unit in response to the transmission;
Based on the determination result of the second call state determination unit, control data is extracted from the first field and voice data is extracted from the second field in the call state in which the call line is connected. And a first reception control means for controlling to extract and process control data from at least the second field in the non-call state in which the call line is released. A cordless telephone device comprising: The cordless telephone device according to claim 1,
The slave is
Based on the determination result of the second call state determination means, control data is transmitted using the first field, and control data is transmitted to the call state, which is the state where the call line is connected, using the second field. A second transmission control unit that controls to transmit voice data and controls to transmit control data using at least the second field in the non-call state in which the call line is released; Prepared,
The base unit is
Based on the determination result of the first call state determination means, control data is extracted from the first field, and voice data is extracted from the second field in the call state in which the call line is connected. And a second reception control means for controlling to extract and process control data from at least the second field in the non-call state where the call line is released. A cordless telephone device comprising: A cordless telephone device according to claim 2 ,
The first transmission control unit of the master unit or the second transmission control unit of the slave unit is based on the determination result of the first call state determination unit or the second call state determination unit. The non-call state, which is a state in which a call line is released, includes identification information indicating a usage mode of the first field and the second field, and at least a data length of control data, using the first field. Transmitting the control data header information, and controlling to transmit the control data using the second field,
The second reception control unit of the master unit or the first reception control unit of the slave unit is based on a determination result of the first call state determination unit or the second call state determination unit. In the non-call state where the call line is released, the transmitted data is extracted using the first and second fields in consideration of the identification information of the first field of the received data. A cordless telephone device characterized by processing. A cordless telephone device according to claim 2 ,
The first transmission control unit of the master unit or the second transmission control unit of the slave unit is based on the determination result of the first call state determination unit or the second call state determination unit. The non-call state, which is a state in which a call line is released, includes identification information indicating a usage mode of the first field and the second field, and at least a data length of control data, using the first field. Control to transmit header information of the control data and a part of the control data, and to transmit another part of the control data using the second field;
The second reception control unit of the master unit or the first reception control unit of the slave unit is based on a determination result of the first call state determination unit or the second call state determination unit. In the non-call state where the call line is released, the transmitted data is extracted using the first and second fields in consideration of the identification information of the first field of the received data. A cordless telephone device characterized by processing. A master unit and a slave unit, and between the master unit and the slave unit, a first field for control data transmission and a second field for voice data transmission having a data length longer than the first field; Wireless communication used in a cordless telephone apparatus that transmits data in a transmission unit having a TDMA (Time Division Multiple Access) / TDD (Time Division Duplex) wireless communication system A method,
In the base unit,
The first call state determination means receives the response sent from the other party in response to the transmission of the call start request from the child machine to the other party of the call, so that the other party and the child It is determined that the call state is a state in which a call line is connected to the machine, and a response sent from the partner in response to sending a call termination request from the slave to the partner A first call state determination step of determining that the non-call state is a state in which the call line is released due to reception;
Based on the determination result in the first call state determination step, the first transmission control means transmits control data using the first field in the call state in which the call line is connected. Then, control is performed to transmit voice data using the second field, and in the non-call state in which the call line is released, the first transmission control means sets at least the second field. And performing a first transmission control process for controlling to transmit control data using
In the slave unit,
When an operation for instructing a call is accepted, a second call is made by receiving a response from the parent device in response to forming a call start request to the other party of the call and transmitting the request to the parent device. When the state determination means determines that the call state is a state in which a call line is connected between the destination and the own device, and receives an operation for instructing to release the call line , the call ends. In response to receiving a response from the base unit in response to forming a request and transmitting the request to the base unit, the second call state determination means is in a non-call state in which the call line is released. A second call state determination step which is assumed to be,
Based on the determination result of the second call state determination step, in the call state that is a state in which the call line is connected, the first reception control means extracts control data from the first field, and Control is performed to extract and process voice data from the second field, and in the non-call state where the call line is released, the first reception control means controls control data from at least the second field. And a first reception control step of controlling to extract and process the wireless communication method. A wireless communication method used in the cordless telephone device according to claim 5,
In the slave unit,
Based on the determination result in the second call state determination step, the second transmission control means transmits control data using the first field in the call state in which the call line is connected. Then, control is performed to transmit voice data using the second field, and in the non-call state in which the call line is released, the second transmission control means sets at least the second field. And performing a second transmission control step for controlling to transmit control data using
In the base unit,
Based on the determination result in the first call state determination step, a second reception control unit extracts control data from the first field in the call state in which the call line is connected, Control is performed so that voice data is extracted from the second field and processed, and in the non-call state in which the call line is released, the second reception control means controls at least from the second field. A wireless communication method comprising performing a second reception control step of controlling to extract and process data.

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