JPH01133436A - Cordless telephone system - Google Patents

Abstract

PURPOSE:To perform a line connection by a two-line system on both sides by setting a call channel in such a way that a DC loop is closed between radio connectors and a radio channel controller and one of the radio connectors to be connected with a communication channel is selected. CONSTITUTION:When an incoming call arrives at a cordless telephone set 2, the polarity inverting circuit 36 of a radio channel controller 3 is actuated and polarity inverting signal is sent to a previously selected radio connector 1 through a line circuit 31. At the connector 1, the DC loop formed between the connector 1 and the line circuit 31 is closed by a DC loop opening/closing circuit 14 in response to the polarity inverting signal and, when the closure of the loop is detected by the controller 3, transmission/reception of PB signal is carried out with the connector 1 and a call channel is formed with the telephone set 2 through the connector 1. On the other hand, when an outgoing call from the telephone set 2 is received by the radio connector 1, the above- mentioned DC loop is closed by the circuit 14 and the call channel is formed with the telephone set 2 through the connector 1 in a similar way.

Description

[Detailed Description of the Invention] [Objective of the Invention 1 (Field of Industrial Application) The present invention relates to a plurality of wireless connection devices that are distributed in a distributed manner and transmit and receive data to and from cordless telephones, and a system that connects these wireless connection devices to an exchange. The present invention relates to a cordless telephone system that can easily perform a call line connection procedure with a wireless line control device.

(Prior Art) Cordless telephone systems that make it easier to carry telephones have recently been attracting attention. This cordless telephone system performs wireless communication between a wireless connection i connected to a telephone port m<subscriber line) and a cordless telephone, and the wireless connection a
Telephone services (incoming and outgoing calls and telephone calls) are received through the terminal. However, the service area (wireless zone) of the wireless connection device for cordless telephones is usually about 20 meters in radius, which limits the area in which cordless telephones can be used.

Therefore, as an area expansion system, for example, as illustrated in FIG. 3, a plurality of wireless connection devices 1a and 1b are used.

~1n are distributed and distributed by dividing their service area into multiple wireless zones, and cordless telephones 2 moving within the service area can provide telephone services by wirelessly communicating with the nearest wireless connection device 1ti. A multi-zone cordless telephone system is being considered. The wireless line control device 3 controls which wireless connection device 11 is used to form a wireless line with the cordless telephone 2 to provide telephone service to the cordless telephone 2.

However, if such a system is configured similar to an off-the-shelf system, for example, a car phone system, the wireless connection device 1i
It is necessary to provide a control line separate from the telephone line between (ia, b, -n) and the radio line control device 3, and to control the line connection via this control line. For this reason, for example, if this type of system is to be introduced into a building in which two-wire wired telephones have already been installed, it will be necessary to install a new control line that has never been used before.

(Problems to be solved by the invention) If we try to expand the cordless telephone system by applying the car telephone system as it is, the system configuration will become unnecessarily complicated and the installation of control lines will become necessary. It also caused high costs.

The present invention has been made in consideration of these circumstances, and its purpose is to connect a plurality of wireless connection devices and a wireless line control device using a two-wire system and a simple procedure. The object of the present invention is to provide a highly practical cordless telephone system that can be used efficiently.

[Structure of the Invention] (Means for Solving the Problems) The present invention divides a service area into a plurality of wireless zones, distributes them, and transmits and receives a plurality of cordless telephones to and from cordless telephones existing in each wireless zone. In a cordless telephone system equipped with a wireless connection device and a wireless line control device that makes and receives calls between these wireless connection devices and forms a wireless line between an exchange and the above-mentioned cordless telephone, Each connecting device is provided with means for instructing line connection by closing a DC loop with the wireless line control device, and on the other hand, the wireless line control device is configured to send a polarity inversion signal to the wireless connection device when a call is received. means for instructing the wireless connection device to close a DC loop, and means for detecting closure of the DC loop of the wireless connection device; When it is detected that the
The present invention is characterized in that a communication line is formed between the cordless telephone and the exchange through the wireless connection device by transmitting and receiving B-fold signals.

(Operation) According to the present invention, it is possible to notify the radio line charge tII device of the incoming call simply by closing the DC loop for the radio line control device. In addition, since connection control of the telephone line after the DC loop is closed is performed by transmitting and receiving PB double signals, the existing two-wire telephone line can be used as is, and the functional circuits owned by the wired telephone exchange can be used. It becomes possible to configure a wireless line control IA device simply by changing the control procedure. Then, it becomes possible to construct a communication system combining wired 111i telephones and cordless telephones from the above-mentioned wired telephone exchange.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic configuration diagram of the main parts of the embodiment system, in which 1 is one of a plurality of wireless connection devices (CE) distributed in a business office, etc., and 2 is this wireless connection device t1.
3 is a mobile cordless telephone that wirelessly communicates with the plurality of wireless connection devices 1 (1a, 1b);
, ~1n) are connected to the radio line control unit (RCU).

This radio line control device 3 selectively connects a line circuit 31 in which a plurality of radio connection devices 1 are individually connected via two-wire lines to a central office line trunk circuit 33 via a communication path switch circuit 32. The wireless connection device 1 is connected to the exchange 1fi (not shown) via a subscriber line connected to the central office line trunk circuit 33.

The central control unit 34 operates according to processing blocks and various data stored in the main storage unit 35, and drives the communication path switch circuit 32 to selectively connect the plurality of line circuits 31 and the office line trunk circuit 33. It controls the

Here, the feature of this system is that a polarity inversion signal is sent to the wireless connection device 1 of the wireless line control device 3 to the line circuit 31 to which the wireless connection device 1 is connected. A DC circuit 36, a Pa signal transmitting circuit 37 and a Pa signal receiving circuit 38 that transmit and receive Pa signals to and from the wireless connection device 1, and a DC circuit that detects the opening and closing of a DC loop formed between the wireless connection device 1. The point is that a loop detection circuit 39 is provided.

Further, the wireless connection device 1 connected to the line circuit 31 transmits and receives Pa signals to and from the line circuit 31.
In addition to the BjM signal receiving section 11 and the Pa signal transmitting section 12, a polarity reversal detection circuit 13 that detects a polarity reversal signal from the line circuit 31 and a DC loop opening/closing circuit 14 that controls opening and closing of the DC loop are provided. At the point.

Thus, when the wireless connection branch M1 receives a call from the cordless telephone 2, it closes the DC loop formed with the line circuit 31 in the DC loop opening/closing circuit 14, and transfers the call to the line circuit 31. 31 (radio line control device 3).

Further, the polarity inversion circuit 36 provided in the line circuit 31 is
When the wireless line control device 3 receives an incoming call to the cordless telephone 2, it sends a polarity inversion signal to the wireless connection device 1 to notify the wireless connection device 1 of this fact. Then, the DC loop detection circuit 1s39 detects that the DC loop of the wireless connection device 1 is closed, and transmits and receives the Pa signal to and from the wireless connection branch M1, and connects the cordless telephone via the wireless connection device 1. 3 to form a telephone line between them.

This call line setting procedure will be explained in more detail with reference to FIG.

The procedure for setting up a wireless communication line via one of the plurality of wireless connection devices 1 differs depending on whether the call is originating from the cordless telephone 8I2 or incoming to the cordless telephone 2. For this reason, first, it is determined whether or not the activation is from the radio line control device 3 side (incoming call to the cordless telephone 2) (step a).

However, in the case of activation from the wireless line controller 3 side,
The polarity inversion circuit 36 of the wireless line control device 3 is activated, and a polarity inversion signal is sent to the preselected wireless connection device 1. Then, upon receiving the polarity inversion signal, the wireless connection device 1 drives its DC loop square root circuit 14 to close the DC loop formed between it and the line circuit 31 (Step C). The wireless line control I8 3 detects the closure of this DC loop and sends the cordless telephone 2 corresponding to the incoming call.
In order to call, the wireless connection device 1 is instructed to do so using the Pa signal (step d).

As a result, the wireless connection device 1 learns that there is an incoming call to the cordless telephone 2, and attempts to send and receive an incoming signal to and from the cordless telephone.

When a call is made using the cordless telephone 2 and the user answers, the signal is transmitted from the wireless connection branch @1 to the wireless line control device 3. As a result, the radio line control device i13 activates the polarity reversing circuit 36 to perform polarization, thereby completing the connection (step f).

As a result, a voice communication path is established with the cordless telephone 812 via the wireless connection titll connected to the communication line, and the communication is performed (step f
).

However, when the user of cordless telephone 2 ends the call,
The wireless connection device 1 receives the end call via the wireless line. As a result, the wireless connection branch @1 opens the DC loop,
The radio line control device 3 detects that this DC loop is opened and releases the communication path set as described above (step Q).

As described above, the procedure for setting up a wireless communication line selectively via the wireless connection device I11 by calling from the wireless line control device 3 side and its cancellation are performed.

On the other hand, the procedure for setting up a telephone line by making a call from the cordless telephone 2 is performed as follows.

When the cordless telephone 2 makes a call, the call information is transferred to a predetermined wireless connection device 1 by a selective signal included therein.
will be received. Then, the wireless connection device 1 that has received this calling information drives its DC loop opening/closing circuit 14 to close the DC loop formed between it and the line circuit 31.

The wireless line connection device 3 detects a wireless connection device 1 with a closed DC loop among the plurality of wireless connection devices 1 (step h), transmits and receives Pa signals to and from this wireless connection device 1, and establishes a call line. Exchange information necessary for setting (step i)
), a telephone line is set up with the wireless connection device 1.

As a result, a voice communication path is established with the cordless telephone 2 via the wireless connection device 1 connected to the communication line, and the communication is performed (step j).

When the call ends, an instruction to end the call is given from the cordless telephone line 2, and the wireless connection device 1 receives this instruction and opens the DC loop. The radio line control device 3 detects that this DC loop is opened and releases the communication path set as described above (step h).

As described above, a procedure for setting up a wireless communication line selectively via the wireless connection device 1 by making a call from the wireless connection device 1 side and its cancellation are performed.

In addition, when a call is received, a specific wireless connection device M1 is selected from the wireless line control device 13, and the wireless connection device is selected in the calling signal in the cordless telephone 812 when the call is made. The insertion control of the signal for this purpose is performed using a control flow different from that of a phone call, such as a location registration flow (a control flow in which the cordless telephone I12 detects the nearest wireless connection device 1 and registers the information in the wireless line control device 3). carried out by.

Therefore, the communication line between the cordless telephone 2 and the cordless telephone 2 that selectively passes through a plurality of wireless connection devices 1 can be established efficiently using a very simple setting procedure of reversing the polarity between the two lines, opening and closing the DC loop, and transmitting and receiving the Pa signal. Can be set. Therefore, it is possible to realize an efficient telephone service that fully takes advantage of the multi-zone cordless insult system.

Note that the present invention is not limited to the embodiments described above. For example, the number of wireless connection devices 1 connected to the wireless line control 1i[3 may be determined according to the system specifications. In addition, the present invention can be implemented with various modifications without departing from the gist thereof.

[Effects of the Invention] As explained above, according to the present invention, a wireless connection device to which a communication line should be established by closing a DC loop between a wireless connection device and a wireless line control device, and Since the call line is set up by transmitting and receiving Pa signals only with the wireless connection device, the line setting procedure selectively via the wireless connection device can be performed very easily and efficiently.

As a result, it can be combined with a wired telephone by using the existing two-wire telephone line and by slightly changing the control procedure of the existing telephone exchange, and it has great practical effects such as being inexpensive and easy to introduce. .

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the main parts of a system according to an embodiment of the present invention;
FIG. 2 is a diagram showing the flow of the wireless line setting procedure in the embodiment system, and FIG. 3 is a schematic diagram of the configuration of the multi-zone cordless telephone system. 1.1a, Ib, ~1n...Wireless connection equipment (GE)
, 2... Cordless telephone, 3... Radio line control unit (RCU), 11... Pa signal transmitter, 12...
Pa signal receiving section, 13... polarity reversal detection circuit, 14.
...DC loop open-and-open circuit, 31...Line circuit, 32
... Call path switch circuit, 33 ... Office line trunk circuit, 36 ... Polarity inversion circuit, 37 ... PB signal transmission circuit, 38 ... PB signal reception circuit, 39 ... DC loop detection circuit. Applicant's agent Patent attorney Takehiko Suzue Figure 2

Claims (1)

[Claims] A service area is divided into a plurality of wireless zones and distributed, and a plurality of wireless connection devices transmit and receive data to and from cordless telephones existing in each wireless zone, and between these wireless connection devices. and a radio line control device that makes and receives calls at the exchange and forms a radio line between the exchange and the cordless telephone, and each of the wireless connection devices closes a DC loop with the radio line control device and connects the exchange with the exchange. means for instructing a line connection between the wireless connection devices, and means for instructing the wireless connection device to close a DC loop by giving a polarity reversal signal to the wireless connection device when a call arrives; means for detecting the closure of a DC loop of a wireless connection device to form a communication line with the wireless connection device, and the wireless line control device transmits a PB signal between each of the wireless connection devices. means for transmitting and receiving, and when detecting the closure of the DC loop of the wireless connection device, transmitting and receiving a PB signal to and from the wireless connection device to form a communication line between the wireless connection device and the exchange; A cordless telephone system characterized by comprising: