JPH04150443A - System for transmitting line used status information of cordless key telephone system - Google Patents

Abstract

PURPOSE:To detect the status of a radio channel without using any control channel by making slave cordless telephone sets other than the slave cordless telephone set being used for communication to monitor the speech channel by intermittently receiving signals from the speech channel. CONSTITUTION:Plural slave cordless telephone sets 301-30n are provided as extension telephone sets and a radio channel is formed between the slave telephone sets 301-30n and the radio transmission-reception circuits 13 and 14 of a master telephone set 10. When one of the slave telephone sets 301-30n is set to a talking state, the other slave telephone sets are set to intermittently receive signals from the speech channel. When the received signals are voices, it can be recognized that the speech channel is busy. When the channel using status is changed from the talking state to a holding state, terminated state, etc., the master telephone set 10 sends information to the slave telephone sets which make the intermittent reception to indicate the changed state. Therefore, each slave cordless telephone set can recognize the used state of the speech channel by detecting the information sent from the master telephone set 10 through the speech channel.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a method for transmitting line usage status information such as call in progress, hold, call end, etc. in a cordless button telephone device.

[Conventional technology]

Since the button telephone device uses multiple extension telephones, information indicating the line usage status such as call in progress, hold, call end, etc.
The information is transmitted from the main device to each extension telephone via a control line, and the line usage status can be displayed on each extension telephone using an LED or the like. By the way, a cordless button telephone device is being considered in which a cordless telephone is used as a plurality of extension telephones. Even in this type of cordless button telephone device, it is desirable to be able to know the line usage status of each cordless telephone handset. In order to achieve this, a method can be considered in which information indicating the line usage status is transmitted from the main device to a plurality of cordless telephone handsets using a control channel.

[Problem to be solved by the invention]

However, the method of providing information indicating line usage state transitions such as call in progress, hold, and end to multiple cordless telephone handsets via the control channel is such that the control channel is transmitted every time the line usage state changes. Since the information is transmitted to each cordless telephone handset via the cordless telephone terminal, the information transmission may be delayed. Also, since there are more opportunities to use the control channel,
There is a drawback that the transmission of other information such as outgoing and incoming calls is delayed. For this reason, no cordless telephone device has been realized to date that can transmit information indicating line usage states such as call in progress, hold, and end to a plurality of cordless telephone handsets. In view of the above points, the present invention provides information indicating line usage status such as call in progress, hold, call end, etc. to other standby cordless telephone handsets without using a control channel. The purpose is to make it possible.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides: a main device that accommodates one or more telephone lines and includes one or more wireless transmitter/receiver circuits; In a cordless button telephone device equipped with a plurality of cordless telephone handsets that are capable of making calls and transmitting data to and from a circuit via a wireless line, each cordless telephone handset is connected to a telephone when another cordless telephone handset is in a talking state. At the same time, the communication channel in the communication state is set to a state of intermittent reception, and the main device transmits line usage status information to each cordless telephone handset via the communication channel at the time of line usage state transition, and the line usage status is Make sure to convey state information.

[Effect]

In this invention, when a certain cordless telephone handset is in a talking state, other cordless telephone handsets are in a state of intermittently receiving the communication channel of the calling state. In this intermittent reception state, while the received signal is voice, it is detected that a call is in progress. Then, when the line usage state changes from this call state to hold, end, etc., information indicating the state after the transition is sent from the main device to the cordless telephone handset that is receiving intermittent reception on the call channel. Therefore, each cordless telephone handset detects the information sent through this communication channel.
You can know the line usage status. At this time, the control channel is not used, and each cordless telephone handset only needs to receive and monitor the communication channel intermittently.

【Example】

FIG. 1 is a block diagram of an embodiment of a cordless button telephone device to which the present invention is applied. In this example, two telephone lines 11+12 are accommodated, but the number of accommodated lines may be one or three or more, of course. Further, although n cordless telephone handsets 301 to 30n are provided, the number of cordless telephone handsets may be two. In the same figure, 10 is a main device, which includes a cross point switch 11, a station line circuit 12+, :] 22, wireless transmitting/receiving circuits 13 and 14 which serve as two wireless master stations, and a distributor 15 provided between the transmitting/receiving circuits 13 and 14 and the transmitting/receiving antenna 21; a radio section control circuit 16 comprising, for example, a microcomputer (S-CPU) for controlling the radio transmitting/receiving circuits 13 and 14;
PB (button button) signal generator 18 and sound source circuit 1
-9, and a main control circuit 17 consisting of a microcomputer (M-CPU) for controlling each of the circuits. The cross-point switch 11 connects the telephone line 11+1.2 and the wireless transmitting/receiving circuit 13 under the control of the main control circuit 17.
] 4, the PB signal generator 18, and the sound source circuit 19. In this example, a plurality of cordless telephone handsets 301 to 30n are provided as extension telephones, and a radio line is formed between them and radio transmitting and receiving circuits 13 and 14, which are radio master stations. In this case, the wireless transmitting/receiving circuits 13 and 14 are each given a separate master station identification code, and each of the cordless telephone handsets 301 to 30n is also given a different handset identification code. A control channel is commonly used for the radio transmitting/receiving circuits 13 and 14, but communication channels are separated. For example, the radio transmitter/receiver circuit 13
If H(A) (this is the selected communication channel among the plurality of communication channels, the same applies hereinafter) is used,
The radio transmitting/receiving circuit 14 selects another communication channel CH(B) from among the remaining plurality of communication channels.
is used. The cordless telephone handsets 301 to 30n have exactly the same configuration, and include a transmitting/receiving antenna 31 and a wireless transmitting/receiving circuit 3.
2, a receiver 33, a transmitter 34, an amplifier 35, and a receiver 33.
6, a control circuit 37 consisting of a microcomputer,
a function button switch 38 connected to the control circuit 37;
It consists of a display circuit 39 equipped with a display for display. Note that 40 is a rechargeable battery such as a NiCd battery. Now, in a state where both the wireless transmitting/receiving circuits 13 and 14, which are wireless master stations, are not used, for example, the cordless telephone handset 30. When the function button switch 38 is used to make a call to the central office line, the control circuit 37 transmits the signal to the main device 10 via the wireless transmitting/receiving circuit 32 and the transmitting/receiving antenna 31.
A transmission request is issued to (radio control channel). For example, the wireless transmitting/receiving circuit 13 of the main device 10 receives this, establishes a communication channel CH(A) with the cordless telephone handset that issued the call request, and transmits the call request data to the main control circuit 17. send to The main control circuit 17 controls the cross point switch 11 based on this transmission request.
The wireless transmitter/receiver circuit 13 is connected to the telephone line 11, for example. Thereafter, a dial operation is performed on the cordless telephone handset 301, and if the other party answers, this cordless telephone handset 301
0. This makes it possible to make a telephone call through the telephone line 11. At the same time, it is possible to make a telephone call via the telephone line 12 using another cordless telephone handset via the wireless transmitter/receiver circuit 14. In the case of an incoming call, conversely, incoming call request data is sent from the main control circuit 17 of the main device 10 to the wireless transmitting/receiving circuit that is the available wireless master station. Then, by establishing a communication channel between the wireless transmitting/receiving circuit and one of the cordless telephone handsets, it becomes possible for the cordless telephone handset to respond to an incoming call. As described above, the cordless telephone handset can perform office line calls through the two telephone lines 11.12 via the radio transmitting/receiving circuit 13.14. Next, while referring to the state transition diagrams in FIGS. 2 and 3,
When there is an incoming call in a state where both the wireless transmitting and receiving circuits 13 and 14 are not used, the cordless telephone handset 302 responds, and then the handset 30 until the call is ended.
2 and other slave units (for example, slave unit 30 is shown as a representative), and the state transitions of the main device 10 will be described below. First, when there is an incoming call, the main control circuit (M-CPU) 17
receives this, and transmits the incoming call to the radio section control circuit (S-CP).
U) Transfer to 16. The radio unit control circuit 16 receives a call channel (5-CH in FIGS. 2 and 3) connection request via the radio transmitter/receiver circuit 13, for example, and a control channel (5-CH in FIGS. 2 and 3).
C-CH in FIGS. 2 and 3) is sent to each cordless telephone handset 301 to 30n. In this case, the call channel connection request includes the handset identification code of any one of the response-designated handsets, and also includes a control signal for switching to a call channel to another handset other than the response-designated handset. In this case, the response designation slave unit is a slave unit that is permitted to send a confirmation signal indicating that it has received a call channel connection request (hereinafter, this type of confirmation signal is referred to as ACK), and the main device 10 The channel connection request is repeated until the ACK is received from the response designated slave device. This is to transmit a call channel connection request to all cordless telephone handsets. When the ACK is sent back to the main device 10 from the response designation slave device via the control channel, the wireless transmitting/receiving circuit 13 of the main device 10 receives the ACK for the communication channel connection request and transfers it to the wireless section control circuit 16. Wireless section control circuit 16
When receiving this ACK, it sends an ACK confirmation signal in response to the ACK via the wireless transmitting/receiving circuit 13 to each of the cordless telephone handsets 301 to 30n via the control channel. When each handset 301 to 30n receives this ACK confirmation signal, the wireless usage status is determined by the wireless transmitting/receiving circuit 1 in this example.
Switch to call channel CB (A) with 3. Then, a switching ACK is sent via each communication channel. When the wireless unit control circuit 16 of the main device 10 receives a switching ACK from any of the slave units via the wireless transmission/reception circuit 13, it sends a call channel switching confirmation to each slave unit via the call channel, and also sends a call to the main control circuit 17. Transmits information indicating completion of channel switching. When the main control circuit 17 receives this call channel switching completion, it sends an incoming call ringing request to the radio section control circuit 16. Upon receiving this, the radio section control circuit 16 designates the handset to which it is desired to ring an incoming call ringing command, and sends it to the handset via the communication channel. At this time, the designation of the slave units to be sounded may be for all slave units or for one slave unit. It is also possible to divide the slave devices into a plurality of groups in advance and specify the settings for each group. Upon receiving this incoming ringing command, the designated handset emits an incoming ringing sound and returns a ringing designation ACK to the wireless section control circuit 16 of the main device 10. When the radio section control circuit 16 receives the ring designation ACK from any of the handsets, it sends a command to all the handsets to open the communication channel. In response to this, each child device sends a channel release ACK to the wireless section control circuit 16 of the main device 10 and releases the communication channel. After the communication channel is opened, each slave unit transmits IT at a certain period, for example, IT-5, as shown in FIG. 4A.
The control channel is intermittently received at a period of 00 msec, for example, for a period of 150 m5 ec. When the radio section control circuit 16 receives the channel release ACK, it transfers information indicating completion of the incoming call connection to the main control circuit 17. When an incoming call response key operation is performed on the handset 302 in response to an incoming call ringing, for example, the handset 302 sends an incoming call response (key code) including its own handset identification code to the main device 10 via the control channel. send. In the main device 10, the wireless unit control circuit 6 receives the incoming call response via the wireless transmitting/receiving circuit 1-3, and transfers information including the key code to the main control circuit 17. Main control circuit 17
identifies the handset 302 that responded to the incoming call from the handset type code in this information, and sends a call channel connection request to the handset 302 to the radio section control circuit 16. In response to this, the radio unit control circuit 16 transmits a call channel connection request including information specifying the handset 302 to all handsets via the control channel. The handset 30 specified by this call channel connection request
Upon receiving this, device 2 sends ACK to the main device 10 via the control channel. Upon receiving this ACK, the radio section control circuit 16 of the main device 10 sends confirmation of the ACK to each child device via the control channel. The designated handset 302 switches its wireless usage state to the communication channel CH(A), and the other handsets also switch to the communication channel CH(A). Then, the designated handset 302 sends a call channel switching ACK to the main device 10. Upon receiving this, the wireless unit control circuit 16 of the main device 10 will:
Sends call channel switching confirmation information to the handset. Other data such as time information can also be added to this call channel switching confirmation information. The handset 302 receives this switching confirmation information, confirms the switching of the communication channel, and sends the ACK to the main device 10. Upon receiving this ACK, the radio unit control circuit 16 of the main device 10 transfers information indicating completion of communication channel switching to the main control circuit 17. The main control circuit 17 transfers the incoming call response confirmation sending request to the radio section control circuit 16. Upon receiving this, the wireless unit control circuit 16 sends incoming call response confirmation information to the handset 302. At the same time, the main control circuit 16 controls the cross-point switch 11 and performs switching to connect the line on which the incoming call was received to the wireless transmitting/receiving circuit 13. In this case, status data indicating that the call is in progress is added to the incoming call response confirmation information, as well as reception mode designation information of the handset. The handset 302 that responded to the incoming call enters a talking state upon receiving the incoming call response confirmation information. Then, for example, a message indicating that a call is in progress is displayed on the display 39. Note that a plurality of LEDs for displaying the line usage status may be installed and the display may be performed on the LEDs. On the other hand, the other handset receives the status data and displays, for example, on the display 39, a display indicating that the communication channel CH(A) is busy. Similar to the above, display may be performed using LEDs. Other handsets also communicate with the wireless transmitting/receiving circuit 13 of the main device 10, as shown in FIG. 4B, according to the reception mode designation information.
Communication channel CH (A) established with handset 302
) will be sent intermittently. That is, in a period of 150 m sec after a control channel intermittent reception period of 150 m 5 ec, the communication channel CH(A) is intermittently received at a constant cycle IT-500 ms ec. Of course, based on the status data, the functional handset detects that the call channel CH(A) is in use. During a call, handsets other than handset 302 intermittently receive the call voice on call channel CH(A). When a call termination operation is performed on the handset 302 from this call state, as shown in FIG. 3, the handset 302 sends call termination operation information (key code) to the main device 10. The radio unit control circuit 16 of the main device 10 receives this call termination operation information and transfers information indicating the termination of the call to the main control circuit 17. When the main control circuit 17 receives state transition information such as from a call state to a call end, it controls the cross point switch 11 to perform call end processing, and also sends a data send discriminator sending request.
The data is transferred to the radio unit control circuit 16. Then, as shown in FIG.
A), a data transmission discriminator of a specific pattern distinguishable from other information, for example [01011, is transmitted to each slave unit over a period longer than the period IT of intermittent reception, for example 600 m5ec. This data transmission discriminator is information indicating that status data will be transmitted subsequently. The handset 302 detects this data transmission discriminator in the reception state of the communication channel, and the other handsets detect the data transmission discriminator in the intermittent reception state of the communication channel CH(A). Then, the handset 30° becomes ready to receive status data.
Further, the other handsets change from the state of intermittent reception of the communication channel CH(A) to the reception state, and then enter the state data reception standby state. On the other hand, the main control circuit 17 of the main device 10 sends a request to send status data (call termination data in this case) to the wireless unit control circuit 10.
6. In response to this, the radio unit control circuit 16
Following the data transmission discriminator, status data, ie, data indicating the end of the conversation, is transmitted. Therefore, each handset receives this call end data, detects the end of the call, and erases the call display on each display 39. The handset 302 then performs call termination processing and sends a status data reception ACK to the main device 10. The wireless unit control circuit] 6 of the main device 10 receives this ACK and sends reception mode designation information to each child device. Upon receiving this reception mode designation information, each slave unit enters a standby state, that is, a state in which it receives control channels intermittently. Note that even when a hold operation is performed on the handset 302 during a call, status data indicating the hold state is sent from the main device 10 to each handset following the data transmission identifier, in the same way. Therefore, by receiving this, other handsets can detect that the call channel in use has transitioned to the hold state. As described above, when the call channel CH(A) is used, other cordless telephone handsets that are not using that call channel
), it is possible to know whether the call is in progress or whether the call is in progress or the state changes such as end of call or put on hold. In addition, when the communication channel CH (B) is used, the other handset is connected to the communication channel CH (A) for example 150 minutes after the intermittent reception period of the communication channel CH (A) within one intermittent reception period IT.
During the period m5 e c, the communication channel CH (B
) is intermittently received. Therefore, a state in which the call channel CH(A) and the call channel CH(B) are used at the same time, that is,
When two handsets are making a call at the same time, the other handset that is not using these call channels will use the call channel CH(A) as shown in FIG. 4C. Both communication channel CH(B) is intermittently received. Note that when all available communication channels are used in this way, information is not transmitted from the main device 10 to other slave devices via the control channel, so in FIG. , each slave unit does not need to perform intermittent reception of the control channel. Note that the above example is a case where there are two wireless transmitting/receiving circuits, and therefore two communication channels that are selectively used, but when three or more wireless transmitting/receiving circuits, and therefore three or more communication channels, are provided. Needless to say, this invention can be applied to If there are three or more wireless transmitting/receiving circuits, even if some of the wireless transmitting/receiving circuits are in use for outside calls, if two wireless transmitting/receiving circuits are free, extension calls can be made using these circuits. In this case, the state of this extension call and other states transitioned from the extension call state can be detected in the same manner as described above for other handsets that are not in use.

【Effect of the invention】

As explained above, according to the present invention, a cordless telephone handset other than a cordless telephone handset transmitting and receiving using a call channel can receive and receive calls intermittently and monitor the call channel in use. It is possible to detect the status of the wireless line. According to the present invention, since the control channel is not used to detect the wireless line usage status, there is no need to switch from the call channel to the control channel, which slows down the transmission of information indicating the wireless line usage status. Never. In addition, in order to transmit information indicating the wireless line usage status,
Since no control channel is used, there is no delay in transmitting other information, such as outgoing or incoming calls.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of a cordless button telephone device to which the present invention is applied; FIGS. 2 and 3 are diagrams showing a sequence in an example of the state in which the wireless line is used;
FIG. 4 is a diagram for explaining the state of intermittent reception of the communication channel for monitoring the usage state of the wireless line, and FIG. 5 is a diagram for explaining the transmission timing of status data from the main device. 10; Main device 11+12; Line 13 14; Radio transmitting/receiving circuit 16; Radio unit control circuit 17/main control circuit 301 to 30n; Cordless telephone handset

Claims (1)

[Scope of Claims] A main device that accommodates one or more telephone lines and includes one or more wireless transmitter/receiver circuits, and the wireless transmitter/receiver circuit allows calls and data transmission to be performed via the wireless line. In a cordless button telephone device equipped with a plurality of cordless telephone handsets, each cordless telephone handset is in a state where, when another cordless telephone handset is in a call state, it is in a state of intermittently receiving the communication channel of that call state, and , Line usage status information of the cordless telephone device, wherein line usage status information is transmitted from the main device to each cordless telephone handset via the communication channel at the time of line usage status transition to transmit the line usage status information. Transmission method.