JP3404950B2 - Digital cordless telephone system - 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 system in which communication between a master unit and a slave unit and communication between a plurality of slave units are performed by transmitting and receiving digital data.

[0002]

2. Description of the Related Art A digital cordless telephone system is constructed, for example, as shown in FIG. In this FIG.
Reference numeral 1 denotes a base unit that serves as a base station. The base unit 1 is connected to a telephone line and includes an antenna 1a for communicating with a handset. A plurality of (three in this case) slaves capable of communicating with the master 1 are prepared. That is, the slaves 2, 3, 4 are prepared, and the slaves 2, 2
Antennas 2a, 3a and 4a are attached to 3 and 4, and the antenna 1a of the master unit 1 and the antennas 2a of the slave units 2, 3 and 4,
Wireless transmission is performed between 3a and 4a.

When a call is made with each of the slave units 2, 3 and 4 to the master unit 1 (or the other party connected to the master unit 1 via a telephone line), a connection control signal of a predetermined format is transmitted to the master unit 1.
Then, the voice data converted into digital data is transmitted to the base unit 1 in a time division manner with the base unit 1 to make a call.

In addition to being connected to a telephone line, the base unit 1 may be connected to a communication device called an intercom, which is installed at the entrance of a house, by a wired signal line (or wireless communication). is there.

In such a digital cordless telephone device, the TDD system (time division duplex system) or the TDMA system (time division multiple access system) for transmitting and receiving the same frequency and performing so-called ping-pong transmission is adopted. There is something.

That is, in the case of the TDD system, for example, as shown in A of FIG. 12, one channel (frequency) is temporally divided into a transmission slot T and a reception slot R, and these slots T and R are alternated. And a guard time (not shown) is provided between these slots T and R. In this case, for example, each slot T, R has the number 1
It is set to about 00 μs. Then, the mobile phone (slave unit) communicates with the base station (slave unit) in the transmission slot T,
Reception from the base station is performed in the reception slot R.

Further, in the case of the TDMA method which is an improved version of the TDD method, as shown in FIG. 12B, the communication between one child device and the parent device is performed within one channel. The transmission slot T and the reception slot R are set to several cycles (1
Frame is used only once, and another transmission slot T and reception slot R in the same channel are used for communication between another slave unit and the master unit, and a plurality of communication devices are used for one channel. It is multiplexed so as to enable inter-communication (communication of a system of half the number of slots prepared in one frame at maximum).

By being multiplexed in this way, the frequency band prepared for the cordless telephone can be used efficiently. By the way, in the case of performing such communication, the transmission of the control signal from the master unit to each slave unit is performed according to a fixed format every predetermined period. That is, for example, as shown in A of FIG. 13, the slot configuration control signal D1 is transmitted to each slave unit for 625 μs every 125 msec. At this time, the control channel, which is a dedicated channel prepared for control signal transmission, is used for transmission.
Then, for example, when it is detected that there is an incoming call from the telephone line connected on the base unit side (so-called external line incoming call), the external line incoming call notification data is added to the control signal D1 and transmitted to each child device. And call.

Then, as shown in FIG. 13B, on the side of each slave unit in the reception standby state, the power supply of the reception unit is intermittently turned on at the timing when this control signal D1 is transmitted to receive the control channel. Then, it is determined whether or not the received control signal D1 includes outside line incoming notification data. Then, when the external line incoming call notification data is included, the incoming call process such as sounding a ringing tone is performed by this handset.

When the slave receives an incoming call from the outside line, the slave unit sends data indicating that the incoming call to the outside line is received from the slave unit to the master unit as an upstream control signal using the control channel. The master unit and the slave unit so that they can be transmitted and received at a predetermined slot in a communication channel (a parent-child communication channel different from the control channel), and the partner unit and the master unit that are transmitted via the telephone line. Allow the handset to talk via.

Further, in the case of a digital cordless telephone system of such a communication system, a call using the parent-child communication channel between the master unit and the slave unit (external call or extension call via the master unit described above) is performed. In addition, an extension call may be performed by direct communication between two slave units by using a channel (slave-unit communication channel) specially prepared for communication between slave units.

The communication on the communication channel between the slave units is also
The slot configuration data is transmitted and received by the above-mentioned TDMA method. In this case, the call for the inter-slave communication is performed on the same channel as the channel for transmitting the communication signal (that is, the inter-slave communication channel). It is done by sending connection request data using.

Therefore, in each slave unit in the reception standby state, as shown in FIG.
As shown in 3B, the power of the receiving unit is periodically turned on to receive the downlink control signal from the master unit, and at the same time, to receive the communication channel between the slave units to receive the communication channel between the slave units. Scans the connection request data sent by, and when it detects this connection request data, it starts the transmission and reception of the call signal on the inter-slave communication channel, Make a call.

In the case of FIG. 13B, one reception results in one
The power supply of the receiving unit is continuously turned on for 20 msec, but as the receiving process during this 120 msec, after first receiving the control channel and capturing the control signal transmitted on the control channel. , All the channels prepared as the inter-slave communication channels (the plural inter-slave communication channels are provided, for example, 10 channels) are sequentially received for about 10 ms each.

[0015]

By the way, in such a process, the handset that is making a handset call using the handset communication channel is the outside line incoming notification data transmitted from the base unit. There was an inconvenience that the call could not be received and the call from the outside line could not be answered. That is, the slave unit that is communicating with the slave unit by using the communication channel between the slave units repeatedly transmits and receives the slot data in one frame cycle, and it is difficult to receive the control channel. Is.

In order to solve this problem, for example, even when a telephone call between handset units is made, a telephone call between the handset units is performed by relaying the base unit (that is, the handset unit always communicates with the base unit). It is also possible to By doing so, communication is always performed under the control of the master unit, and transmission of outside line incoming notification data from the master unit is possible at any time. In this case, however, the master unit simultaneously operates as two slave units. It is necessary to perform communication, and since it is also necessary to transmit the external line incoming notification data on the control channel in order to transmit the external line incoming notification data to the remote units that are not performing the inter-slave handset communication, it is only necessary to transmit the data. It is necessary to have a configuration capable of performing slot communication at the same time, and it is necessary for the base unit to have a plurality of synthesizers for setting communication channels, which makes the configuration of the base unit very complicated.

In the above description, the case of making an incoming call notification of an outside line has been described, but in the case of a cordless telephone system to which an intercom is connected, even when the master unit transmits an incoming call communication from this intercom, There are similar problems.

In view of the above point, the present invention aims to enable a cordless telephone device of this type to easily detect an incoming call, such as an outside line, even during a conversation between the cordless handsets. And

[0019]

The present invention comprises a master unit connected to a telephone line or an intercom and a plurality of slave units,
Digital data having a slot configuration is transmitted by using slots that are different in time between transmission and reception, and communication is performed between a master unit and a slave unit through a predetermined channel, and a slave unit different from the predetermined channel is transmitted. In a digital cordless telephone system that communicates between multiple handsets using inter-communication channels, when the parent device detects an incoming external line from the telephone line or an incoming call from an intercom, the parent device notifies the incoming call on a predetermined channel. The data is periodically transmitted as the data of the slot configuration, and the incoming call notification data is transmitted from the master unit through the inter-slave unit communication channel while the incoming call notification data is not transmitted.

Further, in this case, the transmission of the incoming call notification data from the master unit on the predetermined channel is controlled by a control signal different from the communication channel for transmitting the communication signal between the master unit and the slave unit. It is designed to be transmitted using a transmission channel.

Further, in each case, the transmission of the incoming call notification data from the master unit on the inter-slave unit communication channel is performed within a period in which the incoming call notification data is not transmitted from the master unit on the predetermined channel. After detecting a channel having a vacant slot in the inter-machine communication channel, the vacant slot of the detected channel is used to transmit as data having a slot configuration at a predetermined frame cycle.

Further, according to the present invention, a master unit connected to a telephone line or an intercom and a plurality of slave units are used, and digital data having a slot structure is transmitted by using slots different in time between transmission and reception. In the digital cordless telephone system, which communicates between a plurality of handsets by a communication channel between the handsets, which is different from the predetermined channel, while communicating between the handset and the handsets.
When at least two slaves among a plurality of slaves are talking between slaves using the communication channel between slaves, at least one of the slaves during the talk between slaves is With a child machine,
Temporarily interrupt the reception of the inter-slave communication signal on the inter-slave communication channel, scan the incoming call notification data sent on the inter-slave communication channel during this interrupted period, and scan from the telephone line or doorphone. The incoming call can be detected by the handset.

Further, in this case, in the slave unit during the call between the slave units,
When a silent state is detected in the handset call signal transmitted on the handset communication channel, the reception of the handset call signal is temporarily interrupted and the incoming call notification data sent on the handset communication channel. Is designed to be scanned.

When the silent state is detected, when the silent state signal cannot be continuously detected for a predetermined time in the inter-speech communication signal transmitted through the inter-slave communication channel, the reception of the inter-slave communication signal is forced. In this case, the incoming notification data transmitted on the inter-slave communication channel is scanned temporarily.

Further, in each case, when the incoming call notification data transmitted on the inter-slave unit communication channel is detected by the scan by any one of the slave units, the detected slave unit and the other slave units in the conversation between the slave units are detected. Incoming call notification data is added to the call signal between the handset units to be transmitted.

[0026]

According to the present invention, the incoming call notification data is periodically transmitted from the master unit through a predetermined channel (control channel or the like) as slot configuration data, and the master unit is not transmitted during the period when the incoming call notification data is not transmitted. It is of course possible to detect an incoming call to an outside line or an intercom by scanning the control channel, etc., by sending the incoming call notification data from the device via the inter-slave communication channel, but by scanning the inter-slave communication channel. Also, it becomes possible to detect an incoming call from an outside line or an intercom.

Further, in this case, the transmission of the incoming call notification data from the master unit on the inter-slave unit communication channel is performed within a period in which the incoming call notification data is not transmitted from the master unit on the predetermined channel. After detecting a channel with an empty slot in the inter-communication channel, by using the detected empty slot of the detected channel and transmitting it as data of slot configuration at a predetermined frame cycle, incoming call notification data in the inter-communication channel Will be transmitted by a method adapted to the communication method based on the frame structure.

Further, according to the present invention, at least one of the handset units during the handset handset call temporarily suspends reception of the handset handset communication signal on the handset handset communication channel. By scanning the incoming call notification data sent on the inter-slave communication channel during the suspended period, it is possible to easily detect an incoming call from an outside line or intercom with the slave even during a call between the slaves. Become.

Further, in this case, in the slave unit during the call between the slave units,
When a silent state is detected in the handset call signal transmitted on the handset communication channel, the reception of the handset call signal is temporarily interrupted and the incoming call notification data sent on the handset communication channel. By scanning, the incoming call from the outside line or the intercom can be detected without substantially interrupting the transmission of the voice data for the inter-slave communication.

Further, in the case of detecting the silent state, when the silent state cannot be continuously detected for a predetermined time, the reception of the call signal between the handset units is forcibly interrupted temporarily, and the communication channel between the handset units is set. By scanning the incoming call notification data transmitted by, the incoming call notification data can be detected well in any case.

Further, in each case, when the incoming notification data transmitted on the inter-slave unit communication channel is detected by the scan by any one of the slave units, the detected slave unit and the other slave unit in the conversation between the slave units. By adding the incoming call notification data to the inter-slave unit communication signal transmitted to, the other party during the inter-slave unit communication can detect the incoming call from the outside line or the intercom.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

In this example, TDMA is performed as in the conventional example.
It is applied to the digital cordless telephone system of the method,
The parent device is configured as shown in FIG. That is, the wireless unit 32 receives and processes the data received from the slave unit by the antenna 31, supplies the data to the modulator / demodulator 33, and demodulates the received data. Then, the demodulated received data is transmitted to the A via the communication control unit 34.
AD obtained by receiving and supplying to the DPCM codec unit 35
Digital data of PCM is converted into an analog voice signal, and this analog voice signal is supplied to the line interface section 36 and sent to the analog telephone line connection terminal 37 side.

Further, an analog voice signal obtained from the analog telephone line connection terminal 37 side is supplied to the ADPCM codec unit 35 via the line interface unit 36.
The DPCM digital data is supplied to the modulation / demodulation unit 33 via the communication control unit 34 to be modulated for transmission, and the modulated data is wirelessly transmitted from the antenna 31 connected to the wireless unit 32.

Further, the handset 38 is directly connected to the line interface unit 36 so that the handset 38 can communicate with the outside line side through the analog telephone line connection terminal 37, and the handset 38 can be connected to the ADPCM codec unit 35 side to make a child. It is possible to make extension calls with the machine. Further, the key input unit 39 is connected to the line interface unit 36 so that various controls such as transmission to an outside line can be performed.

Then, in the communication control section 34 of this master unit,
A dedicated channel (frequency band) prepared for control signal transmission is used to transmit control signals at predetermined intervals, and this control signal is used to perform communication control such as calling a child device. There is. Further, in the present example, when an external line incoming call is transmitted by a control signal, a control signal using the inter-slave communication channel is transmitted in parallel with the external line incoming notice transmission by the control signal on this control channel. The external incoming call notification is transmitted by.

Although not shown, the line interface unit 36 of the parent device of this embodiment is connected to the doorphone by a signal line, and when the button installed on the doorphone is pressed, the line interface unit 36 is pressed. An incoming signal as an intercom is transmitted to the communication control unit 34 side via 36. When this incoming signal is transmitted, a voice call can be made when the incoming call is answered by the parent device or the child device, as in the case of an incoming call from an external line from the telephone line.

Next, FIG. 2 shows the configuration of a slave unit that communicates with the master unit. In FIG. 2, reference numeral 11 denotes an antenna, and the radio unit 12 receives and processes data received from the master unit or another slave unit by the antenna 11, and supplies the data to the modulation / demodulation unit 13 to demodulate the received data. Then, the demodulated received data is sent to the ADPCM codec unit 1 via the communication control unit 14.
5, the ADPCM digital data obtained by receiving the data is converted into an analog audio signal, and the analog audio signal is output from the speaker 16.

The audio signal picked up by the microphone 17 is AD
It is supplied to the PCM codec section 15 to be ADPCM digital data, and this digital data is sent to the communication control section 14
The data is supplied to the modulation / demodulation unit 13 via the wireless LAN and modulated for transmission, and the modulated data is wirelessly transmitted from the antenna 11 connected to the wireless unit 12.

Further, the key input section 18 is connected to the ADPCM codec section 1 via the man-machine interface section 19.
5, and the operation information of the key input unit 18 is supplied to the communication control unit 14 side. Further, the display unit 20 is connected to the man-machine interface unit 19 so that the operating state and the like are displayed.

Then, the communication control unit 14 performs control to intermittently receive a control signal transmitted from the master unit on a predetermined control channel at predetermined intervals in the reception standby state, and call the control signal. Wait until.

Then, when the contents of the control signal received by the communication control unit 14 are discriminated and it is judged that the slave unit is called by the connection request data included in the control signal, the communication control unit 14 controls. , This child machine is made to operate correspondingly. When each slave is called by the connection request data transmitted from the master, it may be an incoming call (call) from the intercom other than the case of an extension call or an outside call.

When it is desired to make an outgoing call from each slave unit or an extension call with the master unit, the communication control unit 1
In the control of No. 4, the control channel is used to transmit the connection request data to the master unit. In addition, when it is desired to use the inter-slave unit communication channel to make a call for inter-slave unit extension communication with another slave unit, the communication control unit 14 controls the inter-slave unit communication channel. Using (any one of the channels for communication between slave units prepared for 10 waves),
Send connection request data to another child device.

Next, the communication state between the master unit and the slave unit of this example will be described. First, in the case of the cordless telephone system of this example, the TDMA system is applied, and the signal is transmitted in the frame structure shown in FIG. Is transmitted and received. That is, one frame is divided into 8 slots and this frame structure is repeated. Then, four slots which are half of one frame are transmission slots T1, T2, T3 and T4, and the remaining four slots are reception slots R1, R2, R3 and R4.

Here, the signal transmitted in one slot is
A burst signal of 625 μs (including guard bits) is used, and one frame is set to 5 ms.

The structure of the signal transmitted in one slot will be described. First, the control physical slot for transmission as a control signal has the structure shown in A of FIG. That is, the configuration is such that 240 bits of data are transmitted in one slot of 625 μs, and the ramp bit R
(4 bits) are arranged, and the start symbol (2
Bit), preamble PR (62 bits), unique word UW (32 bits), channel identification code CI
(4 bits), destination identification code (42 bits), origination identification code (28 bits), control data I (34 bits), parity CRC for error verification (16 bits), and 16 bits of guard bits at the end. It is distributed. Then, incoming call notification data and connection request data are added to the control data I portion.

The communication physical slot for transmitting a voice signal for a call has the configuration shown in B of FIG. That is,
It is configured to transmit 240 bits of data in 1 slot of 625 microseconds. First, the ramp bit R (4 bits)
Are arranged in the following order: start symbol (2 bits), preamble PR (6 bits), unique word UW (1
6 bits), channel identification code CI (4 bits), low speed associated channel SA (16 bits), audio data TC
H (160 bits), error verification parity CRC (16
16) guard bits are arranged at the end.

Next, in the cordless telephone system of this example, a transmission state of a signal having such a slot structure will be described.

First, the transmission state of the control signal from the master unit will be described. The master unit uses the control channel to transmit the control signal having the control slot configuration shown in A of FIG. 4 at a cycle of 125 msec. Immediately after transmitting the 1-slot control signal, the uplink control signal transmitted from the slave unit on the control channel is received.

For example, as shown in FIG. 5A, at a timing a11, a timing a12 immediately after transmitting a downlink control signal of 1 slot for 625 μsec on the control channel.
Then, the control channel is received for one slot period, and is captured when the uplink control signal is transmitted. Then, at a timing a13 which is 125 msec after the timing a11,
The downlink control signal for the next 1 slot is transmitted on the control channel, and the control channel is received for 1 slot period at timing a14 immediately after that. Hereinafter, transmission and reception of this 125 msec cycle are repeated.

Here, it is assumed that the communication control unit 34 detects that an external line has arrived immediately before the timing a11. At this time, timings a11, a13 ...
The incoming call notification data is added to the control data I of the downlink control signal transmitted by. The addition of the incoming call notification data is continuously performed until the master unit or the slave unit responds to the outside line or while the incoming signal is continuously supplied from the outside line side.

In this example, after the incoming call notification data is started to be transmitted by the downlink control signal, the incoming call notification data is transmitted using the inter-slave unit communication channel. That is, B of FIG. 5 shows the transmission / reception state of the inter-slave unit communication channel in the master unit, which is the transmission of the downlink control signal at timing a11 and the subsequent timing a12.
The reception of the upstream control signal is performed, and then the reception of the one-slot period is performed on the predetermined inter-handset communication channel at the timing b1 2.5 msec after the wireless unit 32 needs to switch the channel. . Then, following this reception, reception b1, b2, b3, b4 is performed a total of four times at a cycle of 5 msec (section ta in B of FIG. 5). The communication control unit 34 determines whether or not there is transmission of a burst signal having a slot structure for inter-slave communication by performing reception four times in this 5 msec cycle (that is, one frame cycle).
To judge.

Here, when the burst signal is not detected, it is determined that the corresponding slot of this channel is empty, and one slot is formed at the transmission slot timing c1 2.5 msec after the slot is paired with this slot. The control signal of is transmitted. The control signal at this time is a signal having the same configuration as the downlink control signal transmitted at the timing a1 or the like on the control channel (that is, the control slot signal in which the incoming notification data is added to the control data I).

Then, until 2.5 ms before the transmission timing a13 of the next downlink control signal on the control channel, 5
At the timings c2, c3, ..., C20 of the m-second cycle, the control signal is repeatedly transmitted for each slot on the same inter-slave communication channel (processing in the section tb in FIG. 5).

After transmitting the control signal on the inter-slave communication channel at the timing c20, the radio section 32 performs channel switching to transmit the control signal for one slot on the control channel at the transmission timing a13. , And receives the control signal of one slot on the control channel at the reception timing a14.

After receiving the control signal for one slot on the control channel at the reception timing a14, the timings c1 to c20 are repeated every 5 msec from the timing d1 at which 2.5 msec required for channel switching has elapsed.
The control signal is repeatedly transmitted for each slot on the same inter-slave communication channel as described above.

Then, until the timing d24 2.5 ms before the transmission timing a15 of the next downlink control signal on the control channel, the control signal is transmitted slot by slot on the inter-handset communication channel.

Thereafter, the control signal is transmitted / received on the control channel at a cycle of 125 msec, and the control signal is transmitted on the channel for inter-slave communication at a period of 5 msec during a period in which transmission / reception is not performed on this control channel. Transmission (section tc in FIG. 5)
Process) is repeated.

Then, the control signal is transmitted on the inter-slave communication channel until it is no longer necessary to transmit the incoming call notification data.

In the section ta, burst signals are continuously received for four frame periods in the standard to which the cordless telephone system is applied, when there are no signals for four consecutive frames, it is an empty slot. It is because it is decided to judge.

Next, the process of receiving the control signal transmitted in this way on the slave side will be described with reference to FIG. Here, it is assumed that a call between the handset units is performed between the two handset units PS1 and PS2 using a predetermined handset unit communication channel f ₁ . Then, it is assumed that there are five channels f ₁ , f ₂ , f ₃ , f ₄ , f ₅ as the inter-slave communication channels to which the control signal may be transmitted from the master unit.

First, the communication state between the two slave units PS1 and PS2 will be described.
As shown in A of FIG. 6, one slot of communication slot (slot signal having the configuration shown in B of FIG. 4) is transmitted on the inter-slave unit communication channel f ₁ at a certain timing e1.

Then, in the other handset PS2, C in FIG.
At the same timing g1, reception of the inter-slave unit communication channel f ₁ is performed for one slot period, as shown in FIG.
Capture the signal transmitted from.

Then, in the other handset PS2, 2.
After 5 msec, at the timing g2, transmission of one slot for communication on the inter-slave unit communication channel f ₁ is performed, and at the same timing e2 on one slave unit PS1 side, the inter-slave unit communication channel f _{1 is} transmitted. Reception for 1 slot period is performed.

In this way, the slot signal is repeatedly transmitted and received every 2.5 msec, the voice data is alternately transmitted, and the handset communication is performed.

Up to this point, the normal configuration is used in the inter-slave communication, but in this example, one of the slaves PS1 has 100 units.
Channels for inter-slave communication f _{1 to} f ₅ temporarily in a cycle of m seconds
Is continuously received. For example, after performing transmission of one slot at timing e1, 62 required for channel switching is performed.
After 5 μs has elapsed, as shown in FIG.
Continuous reception is performed on the channel f ₁ for μ seconds. Therefore,
Reception of one slot at timing e2 and timing e
The transmission of 1 slot in 3 is not performed here.

Then, after this continuous reception, 625 μs required for channel switching has elapsed, one slot is received at timing e4 as shown in A of FIG. 6, and thereafter, transmission is carried out in one frame period. And reception are performed alternately.

Then, as shown in FIG. 6B, when 100 msec has elapsed from the continuous reception on the channel f ₁ , the continuous reception is performed for 5625 μsec. At this time, the reception is performed on the channel f ₂ different from the previous continuous reception, and the slot signal is transmitted (transmission at timing e41) and received (timing e4) during the continuous reception.
(Reception in 2) and is not performed.

Thereafter, in the same manner, 562 with a cycle of 100 msec.
5μsec continuous reception is performed, but the receiving channel is
Channels for inter-slave communication f ₁ , f ₂ , f ₃ , f in which a control signal may be transmitted from the master unit in a cycle of 100 msec
The 5 channels of ₄ and f ₅ are repeatedly changed and received.

Next, the control signal is transmitted from the master unit and the control signal is received by the slave unit to notify the incoming call of the outside line until the slave unit is connected to the outside line. The connection sequence will be described with reference to FIG. In FIG. 7, fc
Indicates transmission / reception on the control channel, and fn indicates transmission / reception on the communication channel between the parent and child. Then, between the handset PS1 and the handset PS2, a call signal is transmitted and received using the inter-handset communication channel f ₁ to make a handset call (step S1). In this state, the master device CS detects an incoming call from the outside line and transmits a control signal to which the incoming call notification data of the outside line is attached on the inter-handset communication channel f ₂ (step S2). Further, with respect to the control signal transmitted on the control channel fc, the incoming call notification data is added and transmitted, and the simultaneous call is performed (step S3).

Then, as shown in FIG. 6B, the slave unit PS1 sequentially and cyclically receives the inter-slave unit communication channels f _{1 to} f _{5 in} which control signals may be transmitted from the master unit. However, when channel f ₂ is received, step S2
To receive and capture the control signal transmitted on channel f ₂ . When the slave PS1 receives the control signal to which the incoming call notification data is added and determines the incoming call notification data, the communication control unit 14 of the slave PS1 causes the speaker 16 (or another calling speaker) to sound the ringing sound. Control to ring.

Further, when the handset PS1 discriminates the incoming call notification data of the outside line, the handset PS2 which is the other party with whom the call is being made.
To the signal transmitted on the channel f ₁ (slot signal including the voice data shown in FIG. 4B) with the incoming call notification data of the outside line to notify the handset PS2 that there is an incoming call of the outside line (step S4). . In this case, the external line incoming notice data is added to the low-speed associated channel SA of the communication slot shown in FIG. 4B.

In this processing, when it is notified that there is an external line incoming to the handset PS2, the communication control unit 14 of the handset PS2.
However, the control of making a ringing sound from the speaker 16 or the like is performed.

Then, in the handset PS1, a catch button and
Operate the key to connect to the outside line.
Suppose At this time, the handset PS1 is for inter-handset communication.
Channel f₁To communicate with the PS2 that is currently in a call using
A process for disconnecting is performed (step S5). This communication
As the processing for disconnecting, the channel f for communication between the slaves is used. ₁
The low-speed associated channel SA of the slot transmitted by
Data indicating that the communication disconnection (end of call between handset) will be performed
Give it. Alternatively, stop transmitting the slot signal
Then, the communication may be forcibly disconnected.

Then, on the side of the handset PS2, it is judged that the communication disconnection will be performed due to the determination of the data for which the communication disconnection is requested or the continuous loss of the slot signal,
The communication is disconnected by performing processing such as stopping the transmission of the slot signal from the handset PS2 as well (step S6).

After the call between the child devices is completed, the child device PS1
And the base station CS to start communication for outside line communication. That is, the child device PS1 connected to the outside line requests to establish a link channel with the parent device CS (step S7). The request for establishing the link channel is made by transmitting an uplink control signal using the control channel fc. When the parent device CS receives the uplink control signal and determines a link channel establishment request, a link channel (channel and slot number used for communication with the parent device) is assigned to this child device PS1. The control signal is transmitted as a downlink control signal using the control channel fc (step S
8).

Then, when the downlink control signal is received by the handset PS1 and the communication control unit 14 judges the link channel, the instructed channel (here, the channel fn is used).
The burst signal containing the synchronization data is transmitted in the designated slot (step S).
9).

Then, the master device CS also transmits a burst signal containing synchronization data using the paired slots of the same channel (step S10).

When the synchronization between the slave unit PS1 and the master unit CS is established by the transmission of this synchronization data, a burst signal including the voice data TCH is transmitted from the slave unit PS1 (step S1).
1) and the transmission of the burst signal including the voice data TCH from the base unit CS are alternately performed (step S12) to start a call with the other party connected by the telephone line connected to the base unit CS ( Step S13).

In this way, by being able to receive an incoming call from an external line, even when a call between the handset units is being made using the channel for communication between the handset units, the handset unit during the call between the handset units can receive the outside line. An incoming call can be detected and a ringing tone can be sounded, and an external line incoming call can be detected in any state on the handset side.

In this case, in the case of this example, since the external line incoming notification data is transmitted from the master unit using the inter-slave unit communication channel in a short cycle (approximately one frame cycle), the slave unit An external line call is detected by a remote unit that is making a call between handset units using the inter-communication channel, by temporarily scanning the channel where the external line incoming notification data may be transmitted for a short time. Yes, you can easily detect incoming calls from outside lines.

That is, the reception of the outside line incoming notification data for scanning by the slave unit which is making the inter-slave communication is sufficient for a short time, and the reception of the outside incoming call notification data for the scanning is performed during the inter-slave communication. Is almost never interrupted. (In the above-mentioned embodiment, it is possible to mute for 5 msec by only interrupting 5 msec which is one frame period. However, even if muted, the audio was interrupted within this time. However, the external line incoming notification data can be satisfactorily detected. In addition, since the external line incoming notification data is transmitted using an empty channel in the inter-slave unit communication channel, whether the channel for scanning the external line incoming notification data is the same as the channel for the slave unit communication currently in communication, or Since the channels are close in frequency (each slave communication channel is set to an adjacent frequency), the change of the oscillation frequency of the channel selection synthesizer in the wireless unit 12 of the slave is small, and one synthesizer is used. It is possible to switch channels in a short time only by using, and a handset with a simple configuration can scan external line incoming notification data during a call between handset units.

Next, a second embodiment of the present invention will be described with reference to FIG. This example is a cordless telephone system including a master unit and slave units similar to those of the first embodiment described above, and the system configuration and the configurations of the master unit and slave units are omitted.

The transmission of the incoming call notification data of the outside line from the master unit is assumed to have been performed with the configuration of FIG. 5 described in the first embodiment. Then, in this example, the reception notification data is received on the slave side at the timing shown in FIG. That is, if it is assumed that communication between the two handset units PS1 and PS2 is being performed on the handset unit communication channel f ₁ , then the one handset unit PS1 is set to the one shown in A of FIG. , At a certain timing h1, a channel f for inter-slave communication
_{In 1} , transmission of one slot for communication (slot signal having the configuration shown in B of FIG. 4) is performed.

Then, in the other handset PS2, C in FIG.
As shown in FIG. 3, at the same timing i1, the inter-slave unit communication channel f ₁ is received for one slot period, and the slave unit PS1
Capture the signal transmitted from.

Then, in the other handset PS2, 2.
Timing i2 after 5m seconds and one slot in transmission of the communication slots in handset communication channel f _1, at the same timing h2 in one of the slave unit PS1 side, handset communication channel f ₁ Reception for 1 slot period is performed.

In this way, the slot signal is transmitted and received every 2.5 msec, the voice data is alternately transmitted, and the handset communication is performed.

In this example, one of the slave units PS1
On the side, the continuous communication of the inter-slave communication channels f _{1 to} f ₅ is temporarily performed at a cycle of 100 ms. For example, timing e
After the transmission of one slot at 1, the 625 μs required for channel switching elapses, and then continuous reception is performed on the channel f ₁ for about 10 msec as shown in FIG. 8B. Therefore, the handset PS1 does not perform transmission / reception of audio data for two frame periods, that is, reception of two slots at timings h2 and h4 and transmission of two slots at timings h3 and H5.

After the continuous reception, 625 μs required for channel switching elapses, and then, as shown in A of FIG. 8, ₁ on channel f ₁ from timing h6.
Resume receiving and transmitting slot by slot.

Then, as shown in FIG. 8B, when 200 msec has elapsed from the continuous reception on the channel f ₁ , the continuous reception is again performed for about 10 msec. At this time, the reception is performed on the channel f ₂ different from the previous continuous reception, and the transmission and reception of the slot signal during the two-frame period during the continuous reception are not performed.

In the same manner, about 10 times are performed every 200 ms.
Continuous reception is performed every m seconds, but the receiving channel is
In 200m sec period, for inter-handset communications that may control signals from the master unit is transmitted channels _{f 1, f 2, f 3} , f
The 5 channels of ₄ and f ₅ are repeatedly changed and received.

The other parts are constructed in the same manner as in the first embodiment described above.

According to the present example, in order to receive the control signal from the master unit, continuous reception is performed at intervals of about 10 msec at a period of 200 msec. Even during a machine-to-machine call, it is possible to detect incoming call notification data from the master machine and execute incoming call processing. Further, in the case of this embodiment, since the time for continuous reception at one time is relatively long, it becomes possible to more reliably receive the control signal from the master unit.

Next, a third embodiment of the present invention will be described with reference to FIG. This example is a cordless telephone system composed of a master unit and a slave unit similar to the first and second embodiments described above, and the system configuration and the configurations of the master unit and the slave unit are omitted.

It is also assumed that the transmission of the incoming call notification data of the outside line from the master unit is also performed with the configuration of FIG. 5 described in the first embodiment. Then, in this example, the reception of the incoming call notification data on the slave side is performed at the timing shown in FIG. That is, if it is assumed that a call between the two handset units PS1 and PS2 is being performed on the handset unit communication channel f ₁ , then one handset unit PS1 will have a call as shown in A of FIG. , A channel f for communication between the slaves at a certain timing j1
The _1, transmits a one slot communication slot (slot signals the structure shown in B of FIG. 4).

In the other handset PS2, C in FIG.
As shown in FIG. 5, at the same timing k1, the inter-slave unit communication channel f ₁ is received for one slot period, and the slave unit PS1
Capture the signal transmitted from.

Then, in the other handset PS2, 2.
In 5m seconds after the timing k2, perform one slot transmission of the communication slots in handset communication channel f _1, at the same timing j2 in one of the slave unit PS1 side, handset communication channel f ₁ Reception for 1 slot period is performed.

In this way, the slot signal is repeatedly transmitted and received every 2.5 msec, the voice data is alternately transmitted, and the handset communication is performed.

In this example, two slave units PS
1, in PS2, alternately at 100m seconds period, perform a temporary handset between successive reception of the communication channel f ₁ ~f _5. For example, after transmitting one slot at timing j1 by the handset PS1, and 625 μsec required for channel switching has elapsed, as shown in FIG. 9B, continuous reception on the channel f ₁ for 5625 μsec. I do. Therefore, the handset PS1
Then, reception of one slot at timing j2 and transmission of one slot at timing j3 are not performed here.

Then, after 625 μsec required for channel switching elapses after this continuous reception, as shown in A of FIG. 9, ₁ in the channel f ₁ from the timing j4.
Resume receiving and transmitting slot by slot.

Then, when 100 msec has elapsed after the continuous reception on the channel f ₁ in the slave unit PS1, the slave unit PS2 performs continuous reception for 5625 μ seconds this time. At this time, channel f ₂ different from the last continuous reception
1 is being received continuously by the handset PS2 side
The transmission and reception of the slot signal in the frame period (timings k43 and 44) are not performed.

Thereafter, in the same manner, about 5 m at 100 msec cycle.
Continuous reception of each second is performed alternately by the two slave units,
The reception channel at this time is defined as the inter-slave communication channel f ₁ in which the control signal may be transmitted from the master,
Five channels f ₂ , f ₃ , f ₄ , and f ₅ are repeatedly changed.

The other parts are constructed in the same manner as in the first embodiment described above.

According to this example, a call is being made between two handset units.
Since the slaves of two units alternately perform scanning for incoming call notification data, even if one of the slaves is in a range where the radio wave from the master does not reach, the incoming notification can be reliably detected. be able to.

In the case of the third embodiment, the two slave units alternately perform continuous reception, but the two slave units simultaneously perform continuous reception to receive the incoming call notification data. You may make it scan.

Further, even when such alternate continuous reception is carried out by the two slave units, one continuous reception time is set to about 10 msec in the 200 msec cycle as in the second embodiment. You may make it a continuous reception.

Next, a fourth embodiment of the present invention will be described with reference to FIG. This example is a cordless telephone system including a master unit and slave units similar to those of the first embodiment described above, and the system configuration and the configurations of the master unit and slave units are omitted.

It is also assumed that the transmission of the incoming call notification data of the outside line from the master unit is also performed with the configuration of FIG. 5 described in the first embodiment. Then, in this example, the reception notification data is received on the slave side at the timing shown in FIG. That is, between the two slave units PS1 and PS2,
Assuming that the inter-slave unit communication channel f ₁ is used for inter-slave unit communication, one of the slave units PS1 has a certain inter-slave unit communication channel f ₁ at a certain timing m1 as shown in A of FIG. Then, one slot for communication (slot signal having the configuration shown in B of FIG. 4) is transmitted.

Then, the other handset PS2 receives the inter-handset communication channel f ₁ for one slot period at the same timing n1, as shown in C of FIG.
The signal transmitted from 1 is acquired.

Then, in the other handset PS2, 2.
At a timing n2 after 5 msec, transmission of one slot of the communication slot on the inter-slave unit communication channel f ₁ is performed, and at the same timing m2 on one slave unit PS1 side, the inter-slave unit communication channel f _{1 is} transmitted. Reception for 1 slot period is performed.

In this way, the slot signal is repeatedly transmitted and received every 2.5 msec, the voice data is alternately transmitted, and the handset communication is performed.

In this example, one of the slave units PS1
When the communication control unit 14 on the side detects that the voice data to be transmitted is silent data (that is, the handset P).
When it is detected that the voice input to the microphone 17 of S1 is silent for a predetermined period), the incoming notification data is scanned by continuous reception.

That is, it is assumed that the voice to be transmitted is detected to be silent at the timing t ₁ shown by the arrow in FIG. At this time, in the low-speed associated channel SA of the slot signal to be transmitted at the next timing m1, the audio output on the other side is in the mute state (the mute state here is completely silent, and only some background noise is present). May be output) is added).

Then, 625 μs after the slot signal is transmitted at the timing m1, as shown in FIG. 10B, continuous reception is performed on the channel f ₁ for about 10 msec (timings m2, m3, m4). , M5 does not send or receive).

Then, the timing m from the child device PS1
Control data (VOX cancellation instruction data) for canceling the muted state of the audio output on the other side is added to the slot signal transmitted at 7.

In this way, when the voice data to be transmitted is in the silent state, the incoming notification data is scanned by continuous reception, and the continuous reception scan is performed whenever a silent state occurs. In this case, the reception channel is changed every time continuous reception is performed, as in the other embodiments described above.

However, in the case of this example, after a certain time has elapsed since the last continuous reception, the continuous reception is forcibly performed even if there is no silent state. That is, for example, in the example of FIG. 10, the timer circuit in the handset determines whether 200 msec has elapsed since the last continuous reception.
When it is determined that the second has elapsed, as shown in FIG. 10B, continuous reception on the next channel f ₂ is started, and scanning of incoming notification data is executed.

The other parts are constructed in the same manner as in the first embodiment described above.

According to this example, since the incoming call notification data is scanned in the silent state, the call voice is not unnaturally interrupted by the incoming call notification data, and the extension call is satisfactorily performed. In actual conversations, there is often a silence, and there is a high possibility that incoming notification data will be scanned frequently.

When a predetermined time such as 200 msec has passed since the previous scan, the continuous reception is forcibly performed even if the sound is not in a silent state.
Even if the silent state does not occur, the minimum scan of the incoming call notification data is performed.

In the fourth embodiment, one child device P
Although the incoming call notification data is scanned only in S1, the incoming call notification data may be scanned when the other handset PS2 also detects a silent state.

In each of the above-mentioned embodiments, the case where there is an incoming call on the outside line has been described, but the notification when there is an incoming call by calling from the intercom can be performed in the same manner. However, in this case, the incoming call notification data of the outside line and the incoming call notification data of the intercom are set as different data so that the remote unit can distinguish between the incoming call of the outside line and the incoming call of the intercom, and the ringing tone and the like are transmitted to the outside line and the intercom. It may be possible to distinguish by and.

Further, in each of the above-described embodiments, the process of detecting an incoming call such as an outside line while an extension call is being made between two slave units has been described, but three or more slave units are provided. Of course, the present invention can also be applied to detection of an incoming call when a simultaneous call is made between two parties.

[0124]

According to the present invention, by transmitting the incoming call notification data from the master unit via the inter-slave unit communication channel while the incoming call notification data is not transmitted from the master unit via the control channel or the like, the inter-slave unit communication can be performed. An incoming call to an outside line or an intercom can be detected by scanning the communication channel. Therefore, while the control signal is transmitted from the master unit in a prescribed state, it is possible to notify the slave unit that is making the inter-slave unit call of an incoming call.

Further, in this case, after transmitting the incoming notification data from the master unit on the inter-slave unit communication channel, after detecting a channel having an empty slot in the inter-slave unit communication channel,
By using the detected empty slot of the channel and transmitting it as data of the slot structure at a predetermined frame cycle, the transmission of the incoming call notification data on the inter-slave communication channel can be performed in a method suitable for the communication method based on the frame structure. Then, the handset unit can easily detect the incoming call notification data.

Further, according to the present invention, at least one of the slave units during the call between the slave units temporarily suspends the reception of the talk signal between the slave units on the communication channel between the slave units. By scanning the incoming call notification data transmitted on the inter-slave communication channel during the suspended period, you can simply switch the inter-slave communication channel even during the inter-slave communication.
It becomes possible to easily detect an incoming call from an outside line or an intercom by the handset.

Further, in this case, when a silent state is detected in the inter-slave communication signal transmitted through the inter-slave communication channel,
By temporarily interrupting the reception of the handset call signal and scanning the incoming call notification data sent on the handset communication channel, the transmission of voice data for handset call is substantially interrupted. It becomes possible to detect an incoming call from an outside line or an intercom, without fail, and the sound quality of the communication voice of the inter-slave communication is secured.

Further, in the case of detecting the silent state, when the silent state cannot be continuously detected for a predetermined time, the reception of the call signal between the handset units is forcibly interrupted temporarily and the communication channel between the handset units is set. By scanning the incoming call notification data transmitted by, the incoming call notification data can be detected well in any case.

Further, in each case, when the incoming notification data transmitted on the inter-slave unit communication channel is detected by the scan by any one of the slave units, the detected slave unit and the other slave unit in the conversation between the slave units. By adding the incoming call notification data to the inter-slave call signal to be transmitted to the remote unit, the other party during the inter-slave communication can also detect the incoming call from the outside line or doorphone, and all the slaves during the inter-slave communication The machine will be able to detect incoming calls from outside lines or intercoms.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a master unit according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a child device according to the first embodiment.

FIG. 3 is an explanatory diagram showing a frame structure applied in the communication system of the first embodiment.

FIG. 4 is an explanatory diagram showing a slot configuration applied in the communication system of the first embodiment.

FIG. 5 is a timing diagram showing a transmission state of an outside line incoming notification of the master unit according to the first embodiment.

FIG. 6 is a timing diagram showing a reception state of an incoming call notification in the slave according to the first embodiment.

FIG. 7 is an explanatory diagram showing an external line incoming notification processing according to the first embodiment and a connection sequence according to the notification.

FIG. 8 is a timing diagram showing a reception state of an incoming call notification in the slave according to the second embodiment of the present invention.

FIG. 9 is a timing diagram showing a reception state of an incoming call notification in the slave unit according to the third embodiment of the present invention.

FIG. 10 is a timing diagram showing a reception state of an incoming call notification in the slave unit according to the fourth embodiment of the present invention.

FIG. 11 is a configuration diagram showing a configuration example of a cordless telephone system.

FIG. 12 is a configuration diagram showing a communication method.

FIG. 13 is a timing diagram showing a conventional external line incoming notification transmission process from a master unit and a reception process at a slave unit.

[Explanation of symbols]

12,32 radio section 13,33 Modulator / demodulator 14,34 Communication control unit 15,35 ADPCM codec section

Claims (7)

(57) [Claims] 1. A master unit, which is connected to a telephone line or an intercom, and a plurality of slave units. Digital data having a slot structure is transmitted using a slot that is different in time between transmission and reception, and a master unit is transmitted. In a digital cordless telephone system for communicating between a plurality of handsets by a communication channel between the handsets and a handset by a predetermined channel and by using a communication channel between the handsets different from the predetermined channel, When an incoming call from an outside line from the telephone line or an incoming call from the intercom is detected, the master unit periodically transmits the incoming call notification data as slot configuration data through the predetermined channel, and the incoming call notification data Of the incoming call notification data from the master unit via the inter-slave unit communication channel during the period in which no call is transmitted. Less phone system. 2. The control signal transmission for transmitting the incoming call notification data from the master unit on the predetermined channel, which is different from the communication channel for transmitting the communication signal between the master unit and the slave unit. The digital cordless telephone system according to claim 1, wherein transmission is performed using a channel. 3. The slave unit transmits the incoming call notification data from the master unit on the inter-slave unit communication channel within a period in which the incoming call notification data from the master unit on the predetermined channel is not transmitted. 3. The digital signal according to claim 1, wherein after detecting a channel having an empty slot in the inter-communication channel, the empty slot of the detected channel is used to transmit as data having a slot structure at a predetermined frame cycle. Cordless telephone system. 4. A master unit comprising a master unit connected to a telephone line or an intercom and a plurality of slave units, wherein digital data having a slot structure is transmitted by using slots different in time between transmission and reception, and a master unit is transmitted. In a digital cordless telephone system for communicating between a plurality of cordless handsets by a communication channel between a cordless handset and a cordless handset and a cordless handset communication channel different from the above-mentioned prescribed channel, When a call between the slaves using the communication channel between the slaves is performed between at least two slaves among the slaves, at least one slave among the slaves during the call between the slaves. Device temporarily suspends the reception of the inter-slave communication signal on the inter-slave communication channel, and scans the incoming call notification data transmitted on the above-successor-to-slave communication channel during the suspended period to Or A digital cordless telephone system that allows mobile phones to detect incoming calls from doorphones. 5. When a silent state is detected in a handset call signal transmitted through a handset communication channel in the handset during the handset call, the handset call signal is temporarily received. 5. The digital cordless telephone system according to claim 4, wherein the incoming call notification data transmitted on the inter-slave communication channel is interrupted and scanned. 6. When the silent state cannot be continuously detected for a predetermined time in the inter-sector communication signal transmitted through the inter-sector communication channel, the reception of the inter-sector communication signal is forcibly suspended temporarily. 6. The digital cordless telephone system according to claim 5, wherein the incoming call notification data transmitted on the inter-handset communication channel is scanned. 7. When the incoming call notification data transmitted on the inter-slave unit communication channel is detected by a scan by any one of the slave units, the slave unit to be transmitted to the detected slave unit and another slave unit in a conversation between the slave units. 7. The digital cordless telephone system according to claim 4, wherein the incoming call notification data is added to the machine-to-machine call signal.