JPH05235851A - Mca control system - Google Patents

Abstract

PURPOSE:To offer the MCA control system in which a wait time by the use of a control channel is eliminated and the mode is quickly transited to the speech mode when a slave set is hooked off with respect to the control system of a radio telephone set employing the MCA system. CONSTITUTION:The system is an MCA system in which a master set 11 and a slave set 12 implement radio communication and the slave set 12 is always put on the master set 11 in the inoperating state, then while the slave set 12 is always put on the master set 11 in the inoperating state, a control signal is sent/received by using a wired line 15 connecting the master set 11 and the slave set 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control system for wireless equipment using the MCA method.

[0002]

2. Description of the Related Art MCA (Multi Channel)
The Access method is a system that finds a vacant channel among a plurality of channels allocated for wireless communication and uses the channel to make a communication. The channels correspond to the frequencies, and the user makes a wireless call using the vacant channel (frequency band).

Here, of the MCA methods, the MCA method for a small power cordless telephone will be described. Figure 4 is M
It is a conceptual diagram of CA method. A plurality of telephones 10 are connected to the PBX (Private Branch Exchange) 1. These phones 10
Is composed of a pair of a master 11 and a slave 12. Normally, the child device 12 is housed in a child device housing portion 13 provided in the parent device 11. During this time, for example, the battery built in the slave 12 is charged.

The low-power cordless telephone 10 defines a frequency used for control and a frequency used for communication in a frequency band allocated for communication, with the former being a control channel and the latter being a communication channel. Call. The control channel consists of two channels and the communication channel consists of 87 channels, which are shared by all low power cordless telephones in operation.

In the system thus constructed, each telephone channel uses a different frequency so that all telephones 10 can talk without interference. (Operation at the time of calling) First, the base unit 11 carries out carrier sense of the call channel and confirms the idle call channel at regular intervals during standby. When the handset 12 is off-hook at the time of calling, the handset 12 detects the off-hook state. Then, after that, the control channel is carrier sensed to check whether the control channel is vacant. If the control channel is vacant, a signal to the effect that the control channel is to be transmitted is placed and wirelessly transmitted to the master device 11. Here, when it is not possible to confirm the availability of the control channel, the slave unit 12 becomes the standby mode again.

The base unit 11 which has received the signal indicating that the call is to be transmitted,
The control channel is loaded with the communication channel data whose vacancy is confirmed in advance and transmitted to the child device 12, and the channel is switched from the control channel to the communication channel. In addition, the handset 12
Also switches the channel from the control channel to the call channel according to the empty channel data received from the master device 11.

After channel switching, the base unit 11 puts the dial tone from the line on the call channel and transmits it to the handset unit 12. After listening to this dial tone by the handset 12, the operator dials the destination telephone number from the handset 12. As a result, a dial signal is placed on the call channel, and the dial is sent to the line via the base unit 11. When the other party responds to this, the content of the call is placed on the call channel, and the call is transmitted and received between the master 11 and the slave 12.

When the call ends and the handset 12 is returned to the on-hook state, the handset 12 sends a signal indicating that the handset is in the on-hook state to the base unit 11. Base unit 1
1 confirms that it is in the on-hook state,
Disconnect from the line. After that, both the parent device 11 and the child device 12 enter the standby state. (Operation at the time of incoming call) When receiving a call, the base unit 11 detects a call signal from the line. When the calling signal is detected, the base unit 11 carries out carrier sense on the control channel and confirms that it is available. When it is free, a signal indicating that there is an incoming call on the control channel and the call channel data confirmed to be free are placed and transmitted to the handset 12, and the channel is switched from the control channel to the call channel.

When it is not possible to confirm the availability of the control channel,
The main | base station 11 will be in standby mode again. In addition, the handset 12 also performs channel switching from the control channel to the call channel according to the idle call channel data received from the base unit 11.

After switching the channel, the base unit 11 puts a signal indicating the state of the calling signal from the line on the call channel and transmits the signal to the handset 12, and causes the handset 12 to ring. When the slave unit 12 rings, the operator picks up the slave unit 12 and goes off hook. When the handset 12 detects the off-hook state, the handset 12 puts a signal indicating that the handset is off-hook and transmits the signal to the base unit 11.

When the master unit 11 receives the off-hook signal from the slave unit 12, the master unit 11 enters the line connection state, the call content is put on the call channel, and the call is transmitted and received between the master unit 11 and the slave unit 12. .. The operation after this is the same as that at the time of calling.

[0012]

In the above-mentioned conventional system, the control channel for initial setting is used between the base unit 11 and the handset unit 12. However, there are only two control channels, and All small power phones in operation 1
Since it is shared by 0, there is a problem that call control cannot be performed unless it becomes empty. Further, since the control channel is shared by all the low-power telephones 10 in operation, there is a limit on the occupied time between one set of the master unit 11 and the slave unit 12. Furthermore, since the channel moves from the control channel to the call channel, it is impossible to instantaneously shift to the call mode. That is, the busy tone is heard after a while after the slave 12 is detached from the master 11 (off-hook).

The present invention has been made in view of such a problem, and eliminates the waiting time due to the use of the control channel, and when the handset is off-hook, the MCA control system can promptly shift to the call mode. Is intended to provide.

[0014]

FIG. 1 is a block diagram showing the principle of the present invention. The system shown in the figure has a master unit 11 and a slave unit 1.
2 is an MCA system configured to wirelessly communicate with each other, and constitutes a system in which a slave unit 12 is permanently placed on a master unit 11 in an unused state. Then, the master unit 11 and the slave unit 12 constitute one telephone set 10. In the state shown in the figure, the parent device 11 and the child device 12 are in an unused state and are connected via the wired path 15.

[0015]

In the unused state, the slave unit 12 is permanently installed in the master unit 11, and the control signal is transmitted / received using the wired path 15 connecting the master unit 11 and the slave unit 12. did. In the present invention, since the control signal is transmitted and received by using a wire, the control channel required when using wireless is unnecessary. Also,
In the unused state, the parent device 11 to the child device 12 via the wired path 15.
Since the idle call channel data is periodically notified to the mobile phone 12, the mobile phone 12 is off-hook, and at the same time, a wireless call between the base phone 11 and the mobile phone 12 becomes possible. Therefore, it is possible to quickly shift to the call mode.

[0016]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 2 is a configuration block diagram showing an embodiment of the present invention. The same parts as those in FIG. 1 are designated by the same reference numerals. The main | base station 11 is comprised from the microprocessor 20, the pulse transmission circuit 21, the pulse reception circuit 22, and the power supply 23. On the other hand, the child device 12 is the microprocessor 3
0, a pulse transmission circuit 31, a pulse reception circuit 32, and a battery 33. Handset microprocessor 30
In the figure, 30a is a built-in register.

The state shown in the figure shows the state in which the slave unit 12 is hooked on the master unit 11 on-hook. Here, a battery charging path (power supply path) is used as the wired path 15 connecting the parent device 11 and the child device 12. That is, the power source 23 in the base unit 11 enters the charging terminal 34 of the handset 12 via the charging terminal 24, and the battery (chargeable secondary battery) 33 is supplied with power from the charging terminal 34 to be charged. There is. That is, when the child device 12 is housed in the parent device 11, the charging terminals 24 and 34 are physically connected to each other to form the wired path 15. Control signals are transmitted and received using the wired path 15.

Base unit 1 of the system configured as described above
A method of transmitting a control signal from the microprocessor 20 of No. 1 to the microprocessor 30 of the slave 11 will be described.
The slave unit control signal from the master unit microprocessor 20 is converted from a digital signal into a pulse signal by the pulse transmission circuit 21 and superposed on the wired path 15 which is a battery charging path.

The slave unit side pulse receiving circuit 31 converts the pulse signal into a digital signal, and the slave unit microprocessor 3
The control signal is notified to 0. Microprocessor 30
When the control signal is received, the device operates according to the control signal. For example, when vacant call channel data at that time is sent from the base unit 11, processing such as storing it in the register 30a incorporated in the microprocessor is performed.

Next, a method of transmitting a control signal from the slave microprocessor 30 to the master microprocessor 20 will be described. The parent device control signal from the child device microprocessor 30 is converted from a digital signal to a pulse signal by the pulse transmission circuit 32, and is superimposed on the wired path 15 which is a battery charging path. The master unit side pulse receiving circuit 22 converts the pulse signal into a digital signal and notifies the master unit microprocessor 20 of the control signal. Microprocessor 2
When 0 receives this control signal, 0 operates according to the control signal.

FIG. 3 is a circuit diagram showing a concrete configuration example of the embodiment of the present invention. The same parts as those in FIG. 2 are designated by the same reference numerals. The control signal from the master microprocessor 20 is given to the battery charging path via the resistor R1 and the capacitor C1. The capacitor C1 has an AC coupling function for coupling the control signal to the battery charging path. In practice, the control signal output (call channel data) from the microprocessor 20 is the resistor R1 and the capacitor C.
The pulse transmission circuit 21 consisting of 1 produces a differential waveform,
It is superimposed on the battery charging path.

First, the battery charging operation when the base unit 11 and the handset 12 are united will be described. The power from the power source 23 is supplied from the charging terminal 24 via the resistor R2 and the coil L1 to the charging terminal 3 of the slave unit via the wired path 15.
Enter 4. On the slave unit 12 side, the battery 33 is charged with the power from the master unit 11 through the coil L2 and the diode D1.

On the other hand, the signal superimposed on the battery charging path enters the cordless handset 11 side via the wired path 15. On the slave side,
This signal is transferred to the transistor TR1 via the capacitor C2.
Of the transistor TR1 is turned on and off. The collector resistance R3 of the transistor TR1 is connected, and the other end of the resistance R3 is connected to the power supply Vcc.
Its emitter is grounded. The output of the transistor TR1 enters the set input S of the flip-flop FF.
Then, the capacitor C2, the transistor TR1, the resistor R
3 and the flip-flop FF form a pulse receiving circuit 31.

The control signal turns on / off the transistor TR1 via the capacitor C2. Transistor TR1
Is input to the set input S of the flip-flop FF, and the
The S input signal is latched by the sync signal applied to the sync input R of F.

The latched signal is flip-flop F.
Input Q of slave unit microprocessor 30 from Q output of F
Is supplied to. The slave device microprocessor 30 periodically scans this signal to decode the call channel data from the master device 11 and stores it in the built-in register 30a.

The base unit 11 and the handset unit 12 constantly monitor the off-hook state and the on-hook state. When the handset unit 12 is off-hook due to a call or an incoming call, both of them confirm the off-hook state and are stored in the register 3a. Mutual call is promptly made using the existing call channel.

In the above-described embodiment, the originator / receiver and the call end are determined by monitoring the off-hook state and the on-hook state of the master unit and the slave unit, respectively. Therefore,
As for the control signal, the call channel data is only transmitted from the master unit to the slave unit, but the control signal may be transmitted from the slave unit to the master unit or in both directions between the master unit and the slave unit. Further, in the above-described embodiment, the case where the master unit and the slave unit are one-to-one is shown, but the present invention is not limited to this, and even when the master unit and the slave unit are one-to-n. Good. Furthermore, when the slave unit is permanently installed in the master unit, the exchange of control signals via the wired path is also possible.
Not only the battery charging path but also other types of wired paths may be used.

[0028]

As described above in detail, according to the present invention, the MCA control system which eliminates the waiting time due to the use of the control channel and can immediately shift to the call mode when the handset is off-hooked. Can be provided, and the practical effect is extremely large.

[Brief description of drawings]

FIG. 1 is a principle block diagram of the present invention.

FIG. 2 is a configuration block diagram showing an embodiment of the present invention.

FIG. 3 is a circuit diagram showing a specific configuration example of an embodiment of the present invention.

FIG. 4 is a conceptual diagram of the MCA method.

[Explanation of symbols]

 1 PBX (Private Branch Exchange) 10 Telephone 11 Parent machine 12 Slave machine 15 Wired path

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Takashi Ishikawa 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Fujitsu Aces Limited

Claims (4)

[Claims] 1. A MCA system in which a base unit (11) and a handset unit (12) wirelessly communicate with each other, and the handset unit (12) is placed on the base unit (11) in an unused state. In a system that is permanently installed, in a state where it is not used and the child machine (12) is permanently installed in the parent machine (11), a wired path (connecting between the parent machine (11) and the child machine (12) ( An MCA control system adapted to send and receive control signals by using 15). 2. A base unit (11) as the wired path (15)
The MCA control system according to claim 1, wherein a battery charging path from the slave unit to the slave unit (12) is used. 3. The master unit (11) periodically carries out carrier sense of a vacant communication channel when the slave unit (12) is permanently installed in the master unit (11) and confirms the vacant communication channel. 2. The MCA control system according to claim 1, wherein the communication channel data is output from the microprocessor (20) of (11) to the slave unit (12). 4. The microprocessor (3) of the slave unit (12).
0) is provided with a register (30a) for storing the call channel data at that time, and when the slave unit (12) goes off-hook, the call channel stored in the register (30a) is used promptly. 4. The MCA according to claim 3, wherein a wireless call can be started.
Control system.