JP2943818B2 - Digital cordless telephone equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital cordless telephone device, and more particularly to a technique for calling between slave units.

[0002]

2. Description of the Related Art For example, a digital cordless telephone device used in a telepoint system or the like includes a master unit (base station) connected to an exchange via a line and a plurality of wireless slave units (mobile stations). However, as a wireless transmission / reception system between them, a TDD system and a TDMA / TDD system are generally used.

[0003] In the TDD system, a transmission slot T and a reception slot R are alternately repeated as shown in FIG.
A so-called ping-pong transmission is performed.

In the TDMA / TDD system, as shown in FIG. 13B, one frame is composed of a plurality of, for example, four transmission slots T1 to T4 and the same number of reception slots R1 to R4. And R1, T
2 and R2, T3 and R3, and T4 and R4, respectively, for transmission and reception.

[0005] These transmission / reception systems have a feature that the transmission frequency and the reception frequency can be set to the same frequency because transmission and reception are performed in a transmission slot and a reception slot in a temporally separated manner.

[0006] Conventionally, in this type of digital cordless telephone device, a telephone call between slave units is performed by relaying a master unit.

For example, as shown in FIG. 14, in the case of the TDD system, in order to make a call between the slave units MS1 and MS2, the line L is connected using two different frequencies f1 and f2.
Is relayed by the base station BS connected to the exchange via the network.
That is, between the parent device BS and the child device MS1, transmission slots T and reception slots R are allocated as shown in FIGS. 15A and 15B, and transmission / reception is performed with the transmission / reception frequency set to f1. Further, between the master unit BS and the slave unit MS2, transmission slots T and reception slots R are allocated as shown in FIGS. 15C and 15D, and transmission / reception is performed with the transmission / reception frequency set to f2. Then, a call between the slave units MS1 and MS2 is performed by transmission and reception through the master unit BS.

On the other hand, in the case of the TDMA / TDD system,
As shown in FIG. 16, similarly, the slave unit M
A call is made between S1 and MS2, and only one frequency, for example, f1 may be used. However, the slots to be used are changed between the parent device BS and the child device MS1 and between the parent device BS and the child device MS2. That is, for example, as shown in FIGS. 17A and 17B, transmission and reception are performed at the transmission / reception frequency f1 using the pair of the transmission slot T1 and the reception slot R1 between the parent device BS and the child device MS1, and Handset MS
17A and C, transmission / reception is performed at the same transmission / reception frequency using the pair of the transmission slot T2 and the reception slot R2, and the slave unit MS via the master unit BS.
1 and MS2.

[0009]

SUMMARY OF THE INVENTION However, TDD
In the case of a digital cordless telephone device of the system, since two frequencies must be used for communication between slave units, the base station BS
Has the disadvantage that two wireless transmission / reception units are required and the device becomes complicated. In addition, the operating frequencies occupy two frequencies, and there is a problem in effective use of the frequencies.

On the other hand, in the case of a digital cordless telephone apparatus of the TDMA / TDD system, only one radio transmission / reception frequency is required for communication between slave units, so that only one radio transmission / reception unit of the base station BS is required. , Slots must be relayed, which again complicates the device. In addition, two pairs of slots are used for communication between slave units, so that the number of empty slots is reduced, and there is a problem in that the opportunity for another slave unit to talk is reduced.

[0011] Further, in both types, it is impossible to make a call between child devices when the parent device is in use or where there is no parent device, and when the number of child devices increases, the communication method between child devices becomes complicated. However, there is a disadvantage that the control for that is also complicated.

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide a digital cordless telephone device capable of performing a call between slave units without requiring relay of a master unit.

[0013]

[0014]

In order to achieve the above object, the present invention comprises a master unit and a plurality of slave units.
To make calls with different transmission and reception times.
In a cordless telephone device, each slave unit sends out audio.
When making a direct simultaneous call between the control operation means and the one-way slave unit
Means for capturing available call channels
And at least information indicating the captured empty channel.
Direct simultaneous connection request signal between slave units including
Means for transmitting the request to the
After sending the signal to another slave,
Means for transmitting a signal, and a direct simultaneous connection request signal between the slave units.
Signal, the available channel included in this signal
Means for setting the call channel set by the information
If, receiving the synchronization signal, and means for synchronizing the transmission and reception,
After transmitting the synchronization signal for transmission and reception, the audio transmission
Detecting the voice transmission operation of the output control operation means, and
Audio signal to multiple other slave units using the
Transmitting means, and a voice non-transmitting operation of the voice transmitting control means.
Is detected and the one-way slave unit directly
Means for transmitting a simultaneous call end signal to a plurality of other slave units;
One that has a direct simultaneous call between unidirectional slave units
In the slave unit, the voice transmission control operation
When the start operation is performed, the other multiple slave units
A direct simultaneous call between the one-way slave units from the slave unit that made the call
It is characterized by being in a call end state.

[0015]

According to the present invention having the above structure, one slave unit is provided.
Then, when the voice transmission operation of the voice transmission control operation means is performed,
From the other handset using an available call channel.
To make a one-way call. In addition, one-way calling
The non-speech operation of the sound transmission control operation means using the slave unit
The one-way call to multiple other handsets is terminated.
It will be a story.

[0016]

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a digital cordless telephone according to the present invention will be described below with reference to the drawings.

[Embodiment of Direct Communication Between Two-Way Handsets] FIG. 2 is a conceptual diagram of a first embodiment of the present invention, in which each handset (mobile station) MS1, MS2,. Calling with a partner (including a cordless telephone device) connected to L is performed via a base unit (base station) BS in exactly the same manner as in the related art, but, for example, between the slave units MS1 and MS2. A call is made directly between the slave units MS1 and MS2 using a single transmission / reception frequency f1 according to the relationship between the transmission slot T and the reception slot R as shown in FIG. For this reason, each of the slave units MS1, MS2,.
Is configured as follows.

FIG. 4 shows an example of the configuration of each slave unit in this case, wherein 1 is an antenna, 2 is a transmission / reception switch, 3 is a radio receiver, 4 is a demodulator, and 5 is a radio transmitter. , 6
Denotes a modulation unit, 7 denotes a communication control unit, 8 denotes a voice encoding / decoding unit,
Reference numeral 9 denotes a speaker as a receiver, 10 denotes a microphone as a transmitter, and 11 denotes various key input operation units.

The communication control unit 7 controls switching between a used channel and a control channel or a communication channel, and controls switching between transmission and reception. Then, for example, at the time of calling or receiving a call, the key input from the key input operation unit 11 or the demodulation unit 4
And outputs various command signals to be transmitted to the transmission / reception partner side, and controls the reception unit 3, the transmission unit 5, and the transmission / reception switch 2 to perform call control and call reception control. Further, the transmission slot T and the reception slot R are set in order to take the timing of transmission and reception.

When the communication state is established, the communication control unit 7
Controls the switch 2, the receiving unit 3, and the transmitting unit 4 in synchronization with the set transmission slot T and reception slot R. Therefore, the audio signal from the microphone 10 encoded by the audio encoding / decoding unit 8 is transmitted to the other party through the communication control unit 7, the modulation unit 6, the transmission unit 5, the switch 2, and the antenna 1 in order, and transmitted to the transmission slot. During the period T, the transmission frequency f
Sent by 1. The reception signal transmitted from the other party at the frequency f1 during the reception slot R is as follows:
The audio signal is received by the antenna 1, decoded by the audio encoding / decoding unit 8 via the switch 2, the reception unit 3, the demodulation unit 4, and the communication control unit 7, and the audio signal is reproduced and supplied to the speaker 9.

The communication control unit 7 is constituted by a microcomputer, and the two-way direct communication between the slave units is executed by a software program.

FIG. 1 shows an example of the configuration of a communication control unit 7 for making a direct telephone call between slave units. When the communication control unit 7 is constituted by a microcomputer, each means indicates a function executed by a software program.

That is, in the example shown in FIG. 1, each handset includes a call detecting means 20 for direct bidirectional handset communication, a partner handset identification means 21, an idle channel capturing means 22,
A slave direct connection request signal forming means 23, an encoding means 24, a wireless control means 25, a decoding means 26,
A direct connection permission signal forming means 27 between slave units, a synchronizing signal forming means 28 and an end signal forming means 29 are provided.

The call detecting means 20 includes a key input operation unit 11
, And detects a key input operation for direct call between two-way slave units, and supplies a call detection signal to the wireless control unit 25.

The other handset identification means 21 receives the key input operation output from the key input operation section 11, detects the number of the other handset to which a call is to be made directly, and detects the other handset number (for example, the identification code of each handset). Means 23 for direct connection request signal between slave units.
To supply. Note that different slave unit identification codes (hereinafter referred to as slave unit IDs) are assigned to the respective slave units in advance.

The free channel capturing means 22 receives the command from the wireless control means 25, searches for the frequency of the radio wave used in the vicinity of its own handset, and searches for a free channel among a plurality of communication channels. Select and capture. The vacant channel capturing means 22 supplies information as to whether or not a vacant channel has been captured to the wireless control means 25, and when a vacant channel has been captured, information indicating the captured vacant channel, for example, a channel number. Is supplied to the direct connection request signal forming means 23 between the slave units.

The direct connection request signal forming means 23 between the slave units
Receiving the vacant channel number from the vacant channel capturing unit 22 and the partner unit ID from the partner unit identifying unit 21;
It forms a direct connection request signal between slave units including at least these pieces of information and its own slave unit ID, and supplies the direct connection request signal between slave units to the encoding means 24 according to the timing control of the wireless control means 25.

The encoding means 24 includes a direct connection request signal between the slave units from the direct connection request signal forming unit 23, a direct connection permission signal between the slave units from the direct connection permission signal forming means 27, and a synchronization signal. It receives the synchronization signal from the forming means 28 and the direct call end signal between the two-way handset from the end signal forming means 29, converts these signals into a signal format of a command signal described later, The signal is transmitted to the modulator 6 according to the control. Also, it receives the coded voice from the voice coder / decoder 8 and sends it to the modulator 6 under the control of the wireless controller 25.

The radio control means 25 includes a call detection output from the call detection means 20, information on whether or not a free channel has been captured from the free channel capture means 22, a synchronization signal from the synchronization signal forming means 28, In response to the end signal from the talk signal forming means 29, a switch control signal is supplied to the transmission / reception switch 2 in order to switch between the control channel and the talk channel and to control the selection of the channel frequency. A signal for controlling the operation is supplied to the transmission unit 5. The wireless control unit 25 includes a direct connection request signal forming unit 23 between slave units, a direct connection permission signal forming unit 27 between slave units, a synchronizing signal forming unit 28, and an end signal forming unit 2
9 controls the output signal timing. Further, a switching signal for command signal processing and audio signal processing is supplied to the encoding means 24 and the decoding means 26.

The decoding means 26 receives the command signal and the voice data from the demodulation section 4 and supplies the voice data to the voice coding / decoding section 8. Also, as a result of decoding the input command signal, if the own slave unit ID is included, and the command signal is a direct connection request signal between slave units, information indicating that fact, The communication channel number included in the direct connection request signal is supplied to the wireless control means 25, the other party's ID included in the received direct connection request signal between the slave units is decoded, and the other party's ID is converted to the slave unit. It is supplied to the direct connection permission signal forming means 27. When the command signal is a direct connection permission signal between slave units, information indicating that fact is supplied to the wireless control unit 25 and to the synchronization signal forming unit 28.

The direct connection permission signal forming means 27 between the slave units
Receiving the drive signal from the wireless control means 25, a direct connection permission signal between the slave units including the partner slave unit ID from the decoding unit 26 and the own slave unit ID is formed. Encoding means 24 according to timing control
To supply.

The synchronizing signal forming means 28 includes the decoding means 2
6 to form a synchronization signal for setting the transmission slot T and the reception slot R, supply the synchronization signal to the radio control means 25, and encode the synchronization signal according to the timing control of the radio control means 25. To the means 24.

The end signal forming unit 29 receives the end key input operation output from the key input operation unit 11, detects the end of the call, supplies the end detection signal to the radio control unit 25, and An end signal of the direct communication between machines is formed, and the end signal is transmitted to the encoding means 24 according to the timing control of the wireless control means 25.

FIG. 5 shows an example of the signal format of the command signal. The command signal in this example has a bit synchronization signal BSYN at the beginning, and then a frame synchronization signal FS.
YN. Further, the command signal has a system identification code SYID, an error correction code ECC for the code SYID, and a dummy bit DMIT following the frame signal FSYN, and a 5-byte control code following the dummy bit. Has CTRL. In this case, the first byte of the control code CTRL is a code indicating the control content, that is, a code indicating, for example, a request for direct connection between slave units, permission for direct connection between slave units, synchronization, and end of call. The second byte to the fifth byte are parameters or data related to the first byte, such as the own handset ID, the other handset ID, and an available channel number.

The operation of the apparatus having the above-described configuration when a two-way direct telephone call is made between the child apparatuses MS1 and MS2 will be described with reference to the flowchart of FIG. .

In FIG. 6, the left side is, for example, a slave unit MS.
1, the right side shows the operation of the slave unit MS2,
The leftmost and rightmost flows respectively correspond to the control channel (control C
H), the respective flows on the middle side show the operation related to the communication channel (communication CH).

Now, when the call input operation of the two-way direct telephone call is performed in the key input operation unit 11 of the child terminal MS1,
In response to this key input operation, the call detection means 20 detects the call of the two-way handset direct telephone call (step 101).
This call detection output is supplied to the wireless control unit 25, which drives the idle channel capturing unit 22. The vacant channel capturing means 22 includes its own child device MS.
A free channel among a plurality of communication channels is selected at the position where the number 1 is present (step 102), and it is captured (step 103). Then, information on whether or not the captured channel is supplied to the wireless control means 25, and when a vacant channel is captured, information indicating the captured vacant channel, that is, a channel number, is transmitted to the direct connection request signal forming means 23 between slave units. To supply.

Further, the other party's slave unit number which is input by the key input operation is detected by the other party's slave unit identification means 21 and the detected other party's ID is sent to the slave unit direct connection request signal forming means 23. Supplied.

Then, the radio control means 25 detects a free channel of the control channel and sets the control channel for the transmitting section 5 (step 104). Under the timing control of the wireless control unit 25, the inter-slave direct connection request signal forming unit 23 encodes the inter-slave direct connection request signal including the idle channel number, the partner slave unit ID, and the own slave unit ID. To supply. Therefore, handset MS1 transmits this direct connection request signal between handset to handset MS2 through the control channel (step 1).
05).

On the other hand, in the standby state (step 201), the slave unit MS2 receives the direct connection request signal between the slave units (step 202) and decodes it by the decoding means 26. Then, when the received handset direct connection request signal includes the handset ID of the handset MS2, the decoding means 26 indicates to the wireless control means 25 that the handset is a direct connection between handset. Supply signal. The wireless control means 25
In response to this, the vacant channel capturing unit 22 stores the communication channel number included in the direct connection request signal between the slave units,
An instruction to search whether or not the slave device MS2 is a free channel is also given. The vacant channel capturing unit 22 sends the result to the wireless control unit 25. As a result of the search, if the channel is an empty channel, the wireless control unit 25 sets the transmitting unit 5 and the receiving unit 3 to the frequency of the empty communication channel.

The decoding means 26 supplies the slave unit ID of the partner slave unit MS1 to the direct connection permission signal forming unit 27 between slave units. The direct connection permission forming means 27 between the slave units receives the signal and forms a direct connection permission signal between the slave units.
4 In this way, handset MS2 sends back this handset direct connection permission signal to handset MS1 via the communication channel (step 204).

The child device MS1 receives the direct connection permission signal between the child devices and detects it by the decoding means 26 (step 1).
06). The decoding unit 26 drives the synchronization signal forming unit 28 to form a synchronization signal for setting the transmission slot T and the reception slot R, and sends the synchronization signal to the wireless control unit 25 and the encoding unit 24. Then, the wireless control unit 25 sends out the synchronization signal from the encoding unit 24 to the modulation unit 6 and sends it to the partner handset MS2 (step 107).

The slave unit MS2 receives this synchronization signal (step 203), detects it by the decoding unit 26, and sends the detected synchronization signal to the wireless control unit 25. The wireless control means 25 thereby detects the transmission slot T and the reception slot R, and the slave MS2 synchronizes transmission and reception with the slave MS1.

In this way, a communication channel is established between the slave units MS1 and MS2, and a transmission slot T and a reception slot R are set. Therefore, a single frequency, eg, f1, of this captured traffic channel is used to directly transmit between the slave units MS1 and MS2 by the transmission slot T and the reception slot R as shown in FIGS. Is performed (steps 108 and 20).
6).

If the specified communication channel is not an idle channel as a result of the carrier sense in step 203, the direct connection permission signal between the child devices is not transmitted from the child device MS2 to the child device MS1, but is transmitted directly to the child device MS1. Two-way communication is not established.

In the above-described direct two-way communication between the slave units, for example, when the end key is operated on the key input operation unit 11 in the slave unit MS1, the end signal is generated by the end signal forming means 2.
At 9, an end call detection signal is supplied to the wireless control unit 25, and an end call signal is formed, which is supplied to the encoding unit 24. Then, the handset MS1 transmits the end signal from the encoding means 24 to the other handset MS2 (step 109).

The slave unit MS2 receives this end signal,
It is detected by the decoding means 26 (step 207). Then, the end-of-call response signal forming unit (not shown) is driven to form an end-of-call response signal, which is controlled under the control of the wireless control unit 25.
It is sent back to the child device MS1 via the encoding means 24 (step 208). Handset MS1 receives this and detects it by decoding means 26 (step 110).

Thereafter, in the slave units MS1 and MS2, the call control is performed by the wireless control means 25, and both are set in a standby state (steps 111 and 209).

[Embodiment of Direct Simultaneous Call between One-Way Slave Units] FIG. 7 shows a conceptual diagram of a second embodiment of the present invention. In this example, each slave unit (mobile station) MS1, MS2 is shown. ,…
And a call with the other party connected to the line L are carried out via a base unit (base station) BS in exactly the same manner as in the related art. The one-way simultaneous call from the MS 1 to all the other slave units MS 2, MS 3,... Is made directly by using one transmission / reception frequency, for example, f 1. Therefore, each of the slave units MS1, MS2,... Is configured as follows.

FIG. 8 shows an example of the configuration of each slave unit in this case. In addition to the hardware configuration of the example of FIG. 4, a voice transmission control operation for a one-way simultaneous call is performed. A press talk switch 12 as an example of the means is provided for the communication control unit 7. In the case of this example, a direct simultaneous call between unidirectional slaves is selected by a key input operation, and when the direct simultaneous call between unidirectional slaves is selected, as described later,
While the press talk switch 12 is turned on, one-way simultaneous communication such as transmission of a voice message can be directly performed with respect to another slave unit.

FIG. 9 shows an example of the configuration of the communication control unit 7 for making a direct simultaneous call between unidirectional slave units in this example. When the communication control unit 7 is configured by a microcomputer as in the above-described example, each unit indicates a function executed by a software program.

In other words, in the example of FIG. 9, each handset includes a unidirectional simultaneous call mode detecting means 30, an idle channel capturing means 31, a direct simultaneous connection request signal forming means 32 between handset, and a synchronization signal. Forming means 33, encoding means 34, wireless control means 35, decoding means 36, on / off detecting means 37 of press talk switch 12,
End call signal forming means 38 is provided.

The one-way simultaneous call mode detecting means 30 receives a key input operation output from the key input operation unit 11, detects when an input key operation of the one-way simultaneous call is performed, and detects the one-way simultaneous call. Wireless control means 35
Output to In response to this, the wireless control unit 35 enters a mode for performing wireless control for a one-way simultaneous call. Then, the one-way simultaneous call mode detection means 30 further detects when a call key operation is performed, and supplies a call detection signal to the wireless control means 35.

The vacant channel capturing means 31 receives the command from the wireless control means 35 and searches for the frequency of the radio wave used in the vicinity of its own handset in the same manner as in the above-described example, and performs a plurality of calls. Select and capture a free channel from the channels. The vacant channel capturing means 31 supplies information on whether or not a vacant channel has been captured to the wireless control means 35, and when a vacant channel has been captured, information indicating the captured vacant channel, for example, a channel number. Is supplied to the direct simultaneous connection request signal forming means 32 between the slave units.

Direct simultaneous connection request signal forming means 32 between slave units
Receives the vacant channel number from the vacant channel capturing means 31, forms a direct simultaneous connection request signal between the slave units including at least the vacant channel number, and supplies the direct simultaneous connection request signal between the slave units to the encoding means 34. .

The encoding means 34 includes a direct simultaneous connection request signal between the slave units from the direct simultaneous connection request signal forming unit 32, a synchronization signal from the synchronization signal formation means 33, and an end signal from the end signal formation means 38. Receiving speech signals, converting these signals to the signal format of the command signal described above,
The signal is transmitted to the modulator 6 according to the control of the wireless controller 35.
Also, it receives the coded voice from the voice coder / decoder 8 and transmits it to the modulator 6 under the control of the wireless controller 35.
To send to.

The radio control means 35, as in the above example,
It controls the selection of the control channel and the communication channel, and controls the operations of the encoding means 34 and the decoding means 36. In addition, a switching control signal is supplied to the transmission / reception changeover switch 2, and further, a signal for controlling the operation is supplied to the reception unit 3 and the transmission unit 5.

The decoding means 36 receives the command signal and the voice data from the demodulation section 4 and supplies the voice data to the voice coding / decoding section 8. When the input command signal is decoded, if the signal is a direct simultaneous connection request signal between the slave units, information indicating this is supplied to the wireless control unit 35. The wireless control means 35 receives this,
The mobile device is set to the one-way mobile device direct simultaneous call mode, and control is performed to switch the wireless channel from the control channel to the communication channel.

When the decoding means 36 receives a synchronizing signal as a command signal in the direct unidirectional communication mode between the slaves, it sends this synchronizing signal to the radio control means 35. The wireless control unit 35 sets a transmission slot T and a reception slot R.

The on / off detecting means 37 of the press talk switch 12 supplies an on / off detecting output indicating whether the press talk switch 12 is on or off to the wireless control means 35. The wireless control means 35 detects the start and end of the transmission of the voice message from the ON / OFF detection output of the press talk switch 12, and controls the drive of the synchronization signal forming means 33 and the end signal forming means 38.

The synchronizing signal forming means 33 transmits the transmission slot T
And a synchronization signal for setting the reception slot R, and supplies the synchronization signal to the encoding means 34 and the wireless control means 35.

The simultaneous call end signal forming means 38 receives a command from the wireless control means 35, forms a call end signal, and sends this end signal to the encoding means 34 in accordance with the timing control of the wireless control means 35. .

The operation of the apparatus having the above-described configuration when a direct simultaneous call is made between one-way slave units will be described below.
A description will be given of a case where a simultaneous simultaneous call is performed between the one-way slave units toward 2 with reference to a flowchart showing a communication procedure in FIG.

In FIG. 10, the left side is, for example, a slave unit M.
The operation of S1 is shown on the right side of the operation of the slave unit MS2. The flow on the left end and the right end shows the operation on the control channel, and the flow on the middle side shows the operation on the communication channel.

Now, when a call operation for direct one-way simultaneous call between slave units is performed in the key input operation unit 11 of the slave unit MS1, the one-way simultaneous call mode detecting means 30 receives this key input operation and The outgoing call of the one-way simultaneous call between the slave units is detected (step 121). This call detection output is supplied to the wireless control means 35, which drives the idle channel capturing means 31. The vacant channel capturing means 31 selects a vacant channel among a plurality of communication channels at the position where the slave MS1 exists (step 1).
22), and capture it (step 123). And
Information on whether or not the captured channel is supplied to the wireless control means 35, and when a vacant channel is captured, information indicating the captured vacant channel, that is, a channel number, is sent to the direct simultaneous connection request signal forming means 32 between the slave units. Supply.

Then, the radio control means 35 detects a free channel of the control channel and sets the control channel for the transmitting section 5 (step 124). Then, under the timing control of the wireless control means 35, the inter-slave direct simultaneous connection request signal forming means 32 supplies the inter-slave direct simultaneous connection request signal including at least an empty channel number and its own slave unit ID to the encoding means 24. I do. Therefore, handset MS1 transmits this direct simultaneous connection request signal between handset to handset MS2 and the other handset via the control channel (step 125).

On the other hand, handset MS2 and the like (including other handset, the same applies hereinafter) are in the standby state (step 211).
The direct simultaneous connection request signal between the slave units is received (step 2).
12), decoding is performed by the decoding means 36. When the decoding means 36 detects that the decoded command signal is a direct simultaneous connection request signal between slave units, the decoding means 36 supplies a signal indicating the direct simultaneous connection between slave units to the wireless control means 35 of the slave unit. I do. In response to this, the wireless control unit 35 drives, for example, the ringer to notify the user that the simultaneous connection request has been made, and sets the transmitting unit 5 and the receiving unit 3 to the frequency of the vacant communication channel, Slave unit M
S2 is in a state of waiting for reception of a signal transmitted from the slave unit MS1 via the communication channel.

On the other hand, the wireless control means 35 of the slave unit MS1
After transmitting the direct connection request signal between slave units, control is performed to switch from the control channel to the acquired communication channel (step 126). Then, the wireless control unit 35 drives the synchronization signal forming unit 33. Synchronization signal forming means 33
Receives this, forms a synchronization signal for setting the transmission slot T and the reception slot R, and sends this synchronization signal to the radio control means 35 and the encoding means 34. And
By the wireless control unit 35, the slave unit MS1 sends the synchronization signal from the encoding unit 34 to the modulation unit 6, and sends it to the partner slave unit MS2 and the like (step 127).

The slave unit MS 2 receives the synchronization signal (step 213), detects the synchronization signal by the decoding unit 36, and sends the detected synchronization signal to the wireless control unit 25. The wireless control unit 25 thereby detects the transmission slot T and the reception slot R, and the slave unit MS2 and the like can synchronize transmission and reception with the slave unit MS1.

In this way, a communication channel is established between the child device MS1 and the child device MS2 and the like, and the transmission slot T and the reception slot R are set.

When the press talk switch 12 is turned on, this is detected by the on / off detecting means 37. The ON detection output is supplied to the wireless control means 35, and the control operation of the wireless control means 35 causes the slave unit MS1 to be in a state capable of transmitting sound. That is, the microphone 10
Is input to the encoding / decoding unit 8,
The voice message is transmitted from the antenna 1 to the other slave units MS2 and the like at once via the encoding means 34, the modulation unit 6 and the transmission unit 5 (step 128), and the slave unit MS2 and the like receive this voice message (step 128). 214). Therefore, in the child device MS2 or the like, the voice message can be reproduced and listened to by the speaker 9. In addition, in consideration of the case where the user terminal of the receiving side does not want this one-way simultaneous call message, a one-way simultaneous call suppression switch is provided to suppress the sound emission of the sound from the speaker 10. Is also good.

When the transmission of the voice message or the like is completed in the slave unit MS1 and the press-talk switch 12 is turned off, the on / off detection means 37 of the slave unit MS1 detects this and sends an off detection signal wirelessly. It is supplied to the control means 35.
Then, the wireless control means 35 drives the simultaneous call end signal forming means 38 to output the simultaneous call end signal. Therefore, handset MS1 sends this broadcast call end signal to another handset MS2 or the like (step 129), and handset MS2 or the like receives this broadcast call end signal (step 21).
5) In this state, the sub-units MS1, MS2,. Enters the call waiting state. Then, when the press talk switch 12 is turned on in the slave unit MS2 within the predetermined time, for example, the wireless control means 35 responds to the on / off detection signal from the on / off detection means 37 by the synchronization signal. By driving the forming means 33, a synchronization signal is transmitted from the slave unit MS2 to another slave unit (step 216). Other slave unit M
S1 and the like receive this synchronization signal (step 130),
The transmission slot T and the reception slot R are set. Subsequently, when a voice message is transmitted from MS2 (step 217), the voice message is transmitted to child device MS1.
Are received (step 131). Then, when the press-talk switch is turned off, the simultaneous call end signal is transmitted from the handset MS2 to the handset MS1 and the like as described above, and the one-way simultaneous call ends once.

Hereinafter, similarly, within the predetermined time,
When the press talk switch 12 of one of the slave units is turned on, a one-way simultaneous call can be made from the slave unit that has turned on the press talk switch 12 to another slave unit. In this case, in the state of the direct one-way simultaneous call mode between the slave units, if the synchronization relationship once established between transmission and reception is not broken, the transmission and reception of the synchronization signal in the second and subsequent one-way simultaneous call are not performed. It may be omitted.

In this way, by turning on and off the press talk switch 12 with each mobile unit being shifted in time, direct communication between the mobile units can be performed between three or more mobile units by the unidirectional simultaneous call system. It can be carried out.

FIG. 11 shows the relationship between transmission and reception slots during direct one-way simultaneous communication between slave units, where Tv is a voice signal transmission slot, Te is a general communication end signal transmission slot, and Ts is a synchronization signal. A transmission slot and R indicate a reception slot, respectively, and PTOFF indicates an off operation of the press-talk switch 12, and PTON indicates an on operation of the press-talk switch 12, respectively.

[Embodiment with Both Functions of Direct Call Between Two-Way Slave Unit and Simultaneous Call Between One-Way Slave Unit] FIG. 12 shows a direct call between two-way slave units (hereinafter referred to as duplex) and a one-way slave unit. 1 shows the configuration of an example of a digital cordless telephone device having both functions of simultaneous call (hereinafter referred to as simplex). In this example, a press talk switch 12 is provided for the communication control unit 7 and a selection switch 13 for duplex or simplex is provided. In this case, the press talk switch 12 is enabled only when simplex is selected, as is apparent from the figure.

When the duplex switch is selected by the selection switch 13, the communication control section 7 operates as shown in the block diagram of FIG. 1, and operates according to the communication procedure shown in FIG. A two-way direct call is made between the two slave units. Further, when the simplex is selected by the selection switch 13, the communication control unit 7 operates as a configuration as shown in FIG. 9 and operates according to an operation procedure as shown in FIG.
A one-way simultaneous call is made from one slave unit to all other slave units according to ON / OFF of the press talk switch 12.

When the selection switch 13 is in a state where neither the duplex nor the simplex is selected, the slave unit is in the same operation state as the conventional one, and the communication between the slave units can be performed via the master unit. .

[0080]

As described above, according to the present invention, a telephone call can be made directly between slave units without relaying the master unit. Therefore, the configuration of the master unit can be simplified. Since only one transmission / reception frequency is required for a call, the frequency is used efficiently. Further, since only one pair of the transmission slot and the reception slot may be used, the direct telephone call between the child devices does not reduce the chance of the external telephone call, the internal telephone call, and the direct telephone call between the child devices.

Further, according to the present invention, since there is no need to relay the master unit, a direct call can be made between another set of slave units even when the master unit and another slave unit are communicating.

Further, direct communication between slave units is possible even in a place where radio waves from the master unit cannot be reached.

Further, by utilizing a one-way simultaneous call using a voice transmission control means such as a press talk switch, a direct call between three or more slave units can be made.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of a main part of the present invention.

FIG. 2 is a diagram showing an outline of an embodiment of a direct call between two-way slave units according to the present invention.

FIG. 3 is a diagram showing a relationship between transmission and reception slots in the case of the example of FIG. 2;

FIG. 4 is a block diagram of an embodiment of the configuration of the slave unit in the case of the example of FIG. 2;

FIG. 5 is a diagram illustrating an example of a signal format of a command signal.

FIG. 6 is a diagram showing an example of a communication procedure of a direct call between two-way slave units according to the present invention.

FIG. 7 is a diagram showing an outline of an embodiment of a direct simultaneous call between unidirectional slave units according to the present invention.

FIG. 8 is a block diagram of an embodiment of the configuration of the slave unit in the case of the example of FIG. 7;

FIG. 9 is a block diagram of an embodiment of a main part of the example of FIG. 8;

FIG. 10 is a diagram showing an example of a communication procedure of a direct simultaneous call between unidirectional slave units according to the present invention.

11 is a diagram showing the relationship between transmission and reception slots in the case of the example of FIG. 7;

FIG. 12 is a block diagram of an embodiment of the configuration of a slave unit having both the function of direct call between two-way slave units and the function of direct simultaneous call between one-way slave units according to the present invention;

FIG. 13 is a diagram illustrating a relationship between transmission / reception slots of the TDD system and the TDMA / TDD system.

FIG. 14 is a diagram showing an outline of a conventional telephone communication between child devices of the TDD system.

FIG. 15 is a diagram showing the relationship between transmission / reception slots in the case of a conventional TDD-system call between child devices.

FIG. 16 is a diagram showing an outline of a conventional communication between child devices of the TDMA / TDD system.

FIG. 17 is a diagram showing the relationship between transmission / reception slots in the case of a conventional inter-slave phone call of the TDMA / TDD system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transmitting / receiving antenna 3 Receiving part 5 Transmitting part 7 Communication control part 11 Key input operation part 12 Press talk switch 13 Selection switch between duplex and simplex 20 Call detection means of direct communication between two-way child units 21 Counterpart child unit number Detecting means 22, 31 Free channel capturing means 23 Bidirectional direct connection request signal forming means 24, 34 Encoding means 25, 35 Radio control means 26, 36 Decoding means 27 Direct connection permission signal forming means 28, 33 Synchronization signal forming means 30 Call detecting means for direct simultaneous communication between unidirectional slaves 32 Signaling means for requesting direct simultaneous connection between slaves 37 ON / OFF detecting means for press-talk switch 12 BS masters (base stations) MS1, MS2 , MS3 slave unit (mobile station)

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04B 7/26 H04M 1/00 H04Q 7/00-7/38

Claims (2)

(57) [Claims] 1. A digital cordless telephone device comprising a master unit and a plurality of slave units for making a telephone call with transmission and reception timed differently, wherein each slave unit includes: a voice transmission control operating means; Means for capturing an idle channel of a communication channel when calling a direct simultaneous call between slave units; and transmitting a direct simultaneous connection request signal between slave units including at least information indicating the captured idle channel to a plurality of slave units. Means for sending out the direct simultaneous connection request signal between slave units, means for sending out a synchronization signal for transmission and reception after sending the direct simultaneous connection request signal between slave units to another slave unit, Means for setting a communication channel set by information on an available channel included in the signal, means for receiving the synchronization signal, means for synchronizing transmission / reception, and synchronization signal for transmission / reception. After issuing, the detected sound delivery operation of the voice transmission control operation means, and means for transmitting the voice signal to another of the plurality of handset by the speech channel which is the capturing, voice non-feed operation of the voice transmission control unit And a means for transmitting a direct simultaneous call termination signal between the one-way slaves to the plurality of other slaves by using the communication channel, and transmitting the direct simultaneous call between the one-way slaves. One slave unit
In this case, the voice non-transmission operation of the voice transmission control operation means is performed.
When the call is made, the other plurality of handsets make the call.
End state of the direct simultaneous call between the unidirectional slave units from the slave unit
A digital cordless telephone device , characterized in that: 2. A call for direct simultaneous communication between said one-way slave units.
In only one slave unit, the sound transmission control operation means
After the sound non-transmission operation has been performed,
Communication path, and using the held communication path,
Any of the due to the child device single director machine between the direct broadcast of herring roe machine
The digital cordless telephone device according to claim 1, wherein a telephone call is possible .