JPH07170570A - System for private branch exchange - Google Patents

Abstract

PURPOSE:To increase transmission power of a radio base station more than that of each cordless telephone set with transmission power set small so as to allow lots of the cordless telephone sets to be used thereby allowing the communication of each slave set when the slave set of the cordless telephone set is carried for a comparatively long distance. CONSTITUTION:A radio base station 103 is connected to any of subscriber circuits 106, 107, 109 and the transmission power of the radio base station is selected higher than that of a master set of a cordless telephone set 101 so that its radio zone 105 covers a radio zone 105 of the cordless telephone set 101, and a communication frequency of the radio base station 103 is selected differently from a communication frequency of the cordless telephone set 101. Furthermore, a slave set 101b of the cordless telephone set 101 is provided with a means using an identifier the same as an identifier for communication with a master set 101a of the cordless telephone set 101 with the communication frequency of the radio base station and making communication with higher transmission power and also with a means executing a communication start procedure with the master set 101a of the cordless telephone set 101 to which the slave set belongs in the case of dialing and executing a communication start procedure with the radio base station 103 when the communication with the master set is not available.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a private branch exchange in which a cordless telephone is connected to some subscriber circuits. INDUSTRIAL APPLICABILITY The present invention is suitable for use in a private branch telephone exchange device used in a relatively large business establishment. The present invention relates to a method for relieving communication when a cordless telephone handset moves beyond the wireless zone of its parent or when there is no available communication channel of the cordless telephone.

[0002]

2. Description of the Related Art A system capable of connecting a cordless telephone to a terminal of a private telephone exchange system is required, and a commercially available cordless telephone is available when the standard of the terminal matches the general public line provided by NTT. Connected and used. Generally, a cordless telephone having a small transmission power and a small wireless zone has a practically effective communication distance of about 10 m, and communication becomes impossible when the cordless telephone is carried in a business office with a cordless telephone handset. . If the transmission power is large, the practical communication distance is 100 m.
To some extent, the number of available communication frequencies is limited, so the communication areas will overlap with each other within one business site. Can not be used.

The following are known as related prior art techniques. A technique for connecting a general mobile telephone to a private telephone exchange system is disclosed in Japanese Patent Laid-Open No. 61-177039. This is to disperse base stations to which mobile phones can be connected so that a part of them can be connected to a private branch exchange, which is different from the purpose of expanding the range of use of cordless phones. Further, Japanese Patent Laid-Open No. 3-45065 discloses a system in which a mobile phone is provided as a terminal for a private telephone exchange system and the position information is managed when the mobile phone moves within a business office. The present invention makes use of this technology when the cordless telephone handset is configured to manage its position information when it moves.

[0004]

The departments that require the use of cordless telephones for terminals of the private telephone exchange system are often factory or work sites, rather than departments that perform desk work even inside offices. When moving to the work site, there is a drawback that many cordless telephones cannot be used because the one with low power cannot be effectively used and the one with high power has a limited number of channels. .

Since it is difficult to expand the use allocation of radio waves, when a large number of cordless telephones are used, the power of each cordless telephone is set to a small value, and the cordless handset is provided only in the vicinity of its parent unit. It is rational that a person who makes the service available at a long distance travels and provides a service of a long reach each time the call occurs.

[0006] The present invention has been made against such a background, and the transmission power of the cordless telephone is reduced so that a large number of the cordless telephone can be used, and a cordless telephone handset can be carried over a relatively long distance. It is an object of the present invention to provide a private telephone exchange system that enables individual communication for those who intend to move. An object of the present invention is to effectively use radio resources.

[0007]

SUMMARY OF THE INVENTION The present invention is a private branch exchange that accommodates a number of subscriber circuits, allowing a cordless telephone to be connected to a portion of the subscriber circuits. Further, the radio base station is connected to one of the subscriber circuits different from the subscriber circuit to which the cordless telephone is connected. The wireless base station is placed at a location where a mobile device of a moving cordless telephone communicates with, such as a work site or a factory in a business establishment where the private branch telephone exchange system is installed.

The transmission power of the radio base station is higher than the transmission power of the base unit of the cordless telephone, and the radio zone is partially arranged so as to include the radio zone of the cordless telephone. The communication frequency of the station is set to a frequency different from the communication frequency of the cordless telephone. And the cordless phone handset
There is provided a means for performing communication at the communication frequency of the wireless base station and at high transmission power using the same identifier (ID) as the identifier (ID) when communicating with the master unit of the cordless telephone to which the slave belongs.

When the cordless telephone slave unit makes a call, first, a communication start procedure with the cordless telephone master unit to which the cordless telephone belongs is executed, and when the communication is impossible, the cordless telephone base station Execute the communication start procedure. In other words, if you try to connect using the communication frequency of the cordless phone with a small amount of power and the handset is out of the wireless zone of the parent device, or if there is no available communication frequency of the cordless phone, use a large amount of power. Connection via a wireless base station is made using another communication frequency.

Conversely, the same is true when an incoming call is made to the subscriber circuit to which the cordless telephone is connected,
First, the connection procedure is executed for the subscriber circuit, and if communication is impossible, the connection procedure is executed for the subscriber circuit to which the radio base station is connected.

It is also possible to have a structure in which the position information is recorded when the slave unit moves. That is, the private branch exchange is equipped with a database that records whether or not each cordless telephone slave unit is in the wireless zone of the parent unit based on the immediately preceding communication history, and the subscriber circuit to which the cordless telephone is connected. When an incoming call occurs to the subscriber, the database is referred to, and when the cordless telephone slave unit is in the wireless zone of the master unit, the connection procedure is executed to the subscriber circuit, and when it is not, the wireless base station is connected. Can be configured to execute the connection procedure for the subscriber circuit to which is connected.

In this case, the cordless telephone handset is
The private branch exchange may be configured to automatically execute a connection request to the database in a predetermined cycle, and the private branch exchange may be configured to update the position information recorded in the database in response to the connection request.

Another aspect of the present invention is a cordless telephone used in the above method, and yet another aspect is a cordless telephone handset used in the above method.

[0014]

In the system of the present invention, the cordless telephone can be connected to the extension terminal connected to the private branch exchange. The cordless telephone is a so-called curl cordless device with low transmission power. In addition to the cordless telephone, a radio base station having a higher transmission power than that is provided, and the radio base station is connected to a private branch exchange. The communication frequency of the wireless base station is set to a frequency different from the communication frequency of the cordless telephone.

Therefore, when it is desired to have a large mobile range in a terminal using a cordless telephone, the cordless telephone communicates with this wireless base station in addition to the function of the cordless telephone. Function will be added. This is a device with a power higher than the transmission power of the cordless telephone, and its communication frequency is a frequency different from the communication frequency of the cordless telephone. But,
In the present invention, the same identifier (ID) as that of the cordless telephone as a slave unit can be used.

A user who uses a cordless telephone handset equipped with such equipment automatically moves when moving beyond the wireless zone of the cordless telephone or when the communication frequencies of the cordless telephone are all blocked. Communication can be performed by connecting to this wireless base station.

In the method of recording the position information, an incoming call to the subscriber circuit to which the cordless telephone is connected is practically and conveniently processed. In general, cordless phones sold on the market are connected to cordless handsets, in addition to cordless handsets, so people who use cordless handsets can carry their handsets and move to distant places. If the mobile device does not receive a radio wave and cannot respond, the call continues for a long time. Therefore, in the method in which the exchange accesses the subscriber circuit to which the main unit is connected first, there is an advantage that the small power is transmitted first, but it is clear that communication is not possible even if a call is made, and the call route is set to be wireless. It takes time to switch to the base station. It is possible to prevent the inconvenience that it takes a long time to connect when the position is recorded and it is clear that the child device is absent in the vicinity of the parent device.

[0018]

Embodiments of the present invention will now be described with reference to the drawings.

(First Embodiment) FIG. 1 is a diagram showing the overall construction of the first embodiment of the present invention, and FIG. 2 is a block diagram showing the construction of a cordless telephone handset in the first embodiment of the present invention.

The first embodiment of the invention is a multi-subscriber circuit 1.
06, 107, 109 and the subscriber circuits 106, 10
A private branch exchange 110 accommodating 7, 109 and a central processing unit 111 connected to the private branch exchange 110 are provided, and a cordless telephone 101 is connected to a part of the subscriber circuits 106, 107, 109 to connect the subscriber. The wireless base station 103 is connected to the circuit 107, the transmission power of the wireless base station 103 is higher than the transmission power of the master device 101a of the cordless telephone 101, and the wireless zone 105 includes the wireless zone 104 of the cordless telephone 101. The communication frequency of the wireless base station 103 is set to a frequency different from the communication frequency of the cordless telephone 101.

The cordless telephone handset 101b is shown in FIG.
As shown in FIG. 3, a CPU, a transceiver TRCV1 for cordless telephones having communication frequencies f _{1 to} f _n and transmission power P ₁ ,
The base station communication transceiver TRCV2 having communication frequencies F _{1 to} F _n and transmission power P ₂ (P ₁ <P ₂ ), a microphone and earphones, a battery, and an antenna are included. When making a call to a unit that communicates at the communication frequency of the wireless base station 103 and at a high transmission power using the same identifier (ID) as when communicating with the base unit 101a of the cordless telephone 101 to which it belongs First, the cordless telephone 10 to which the cordless handset 101b belongs
A call control means for executing a communication starting procedure with the base unit 101a of No. 1 and executing a communication starting procedure with the wireless base station 103 when communication is impossible.
The central processing unit 111 of 10 includes a cordless telephone 10
When an incoming call is made to the subscriber circuit 106 to which 1 is connected, first, the connection procedure is executed for the subscriber circuit 106, and when communication is impossible, the wireless base station 103 is connected to the subscriber circuit 107 to which the subscriber circuit 107 is connected. Incoming call control means for executing the connection procedure is provided.

Next, the operation of the first embodiment of the present invention thus constructed will be described. FIG. 3 is a flow chart showing the flow of control operation at the time of calling of the CPU provided in the handset in the first embodiment of the present invention, and FIG. 4 is an incoming call of the CPU provided in the handset of the first embodiment of the present invention. FIG. 5 is a flow chart showing the flow of control operation during standby, and FIG. 5 is a flow chart showing the flow of control operation of the central processing unit in the first embodiment of the present invention.

As shown in FIG. 3, the control operation of the CPU provided in the cordless phone 101 of the cordless handset 101 at the time of making a call is as follows. First, communication frequencies f _{1 to} f _n and transmission power P are set.
1. Select the transceiver TRCV1 for cordless telephone,
The connection procedure with the parent device 101a is started. Next, it is determined whether or not the connection is possible, and if possible, the master device 101a
Connect to and set the call status.

If the connection is impossible, communication frequencies F _{1 to} F
_n , transmission power TRCV1 for cordless telephone
A base station communication transceiver TRCV2 having a larger P ₂ is selected, a connection procedure with the radio base station 103 is executed, and a call state is set.

As shown in FIG. 4, the control operation during waiting for an incoming call is as follows. First, the transceiver TRCV for cordless telephones.
Select 1 to determine whether there is an incoming call. When there is an incoming call, the connection procedure with the base unit 101a is executed to set the call state. When there is no incoming call, the communication frequency F ₁ ~
The base station communication transceiver TRCV2 having F _n and transmission power P ₂ (P ₁ <P ₂ ) is selected and the presence or absence of an incoming call is determined again. If there is no incoming call, the control is returned to the original state. When there is an incoming call, the connection procedure with the wireless base station 103 is executed to set the call state.

Now, the control operation of the central processing unit 111 in the first embodiment of the present invention will be described. The central processing unit 111, as shown in FIG.
When there is an incoming call to the subscriber circuit 106 to which 1 is connected, that subscriber circuit 106 is selected and a calling signal is transmitted. Next, it is judged whether or not there is a response, and if there is a response, the communication path is set. If there is no response, it is determined whether or not a time-out has occurred, and if the time-out has not yet occurred, the determination process is repeated until there is a response. If it has timed out,
The subscriber circuit 107 to which the radio base station 103 is connected is selected, and call control is executed. It is determined whether or not there is a response to this call control, and if there is a response, the communication path is set.
If there is no response, it is determined whether or not a timeout has occurred, and if not, the determination process of whether or not there is a response until the timeout is repeated. If it has timed out, call loss processing is executed.

(Second Embodiment) FIG. 6 is a diagram showing the overall construction of a second embodiment of the present invention.

The second embodiment of the present invention is the central processing unit 111.
In addition, the cordless telephone 101 is connected to the cordless telephone 101, and the cordless telephone 101 is provided with the database 112 for recording the position information indicating whether the cordless telephone 101b is in the wireless zone of the parent 101a based on the history of the communication immediately before. When an incoming call is made to the subscriber circuit 106, the database 112 is referred to and the cordless telephone 101 has a cordless handset 1
When 01b is in the wireless zone 104 of the base unit 101a, the connection procedure is executed to the subscriber circuit 106, and when it is not present, the connection procedure is executed to the subscriber circuit 107 to which the wireless base station 103 is connected. The wireless base station 103 is provided with means for giving the identifier of the slave 101b to the subscriber circuit 107, and the wireless base station 103 is provided with means for executing a call connection procedure of the slave 101b by a wireless line according to the identifier coming from the subscriber circuit 106. Handset 10 of telephone 101
1b is provided with a means for automatically executing a connection request to the database 112 in a predetermined cycle, and further, the central processing unit 111 of the private branch exchange 110 stores the position information recorded in the database 112 according to the connection request. A means for updating is provided. Others are the same as in the first embodiment.

In the case of the second embodiment, the central processing unit 1
As shown in FIG. 7, the reference numeral 11 accesses the database 112 to check the position information when an incoming call is received, and the incoming subscriber circuit 106 is the subscriber circuit 106 to which the cordless telephone 101 is connected. The wireless base station 103
Is the connected subscriber circuit 107. In the case of the subscriber circuit 106, when the call signal is transmitted and the call ends, the location registration update process of the database 112 is performed.
If it is the subscriber circuit 107, call control is performed, and when the call ends, the location registration update process of the database 112 is performed.

The overall operation of the second embodiment of the present invention will be described.

First, the handset 101b is the cordless telephone 1
01 exists in the wireless zone 104 configured by the parent device 101a, the child device 101b recognizes that it exists in the wireless zone 104, and sets the carrier of the radio wave used for communication to be the same as that of the parent device 101a. Set. In addition, base unit 101a
Identifies that the child device 101b exists in the wireless zone 104 by an identifier (hereinafter referred to as ID), and the subscriber circuit 1
Via 06, the central processing unit 111 is notified that the child device 101b exists in the wireless zone 104. The central processing unit 111 stores in the database 112 that the child device 101b exists in the wireless zone 104. At this time, when the extension telephone 108 makes a call to the handset 101b, the central processing unit 111 reads from the database 112 that the handset 101b exists in the wireless zone 104, and the base unit 101a receives the call to the handset 101b. multiply. The parent device 101a connects to the child device 101b through a radio wave carrier different from that of the wireless zone 105. When the handset 101b responds, the central processing unit 111 controls the private branch exchange 110 to set the extension telephone 108 and the handset 101b in a call state.

Further, when the handset 101b moves outside the range of the wireless zone 104 after the call ends, it recognizes that the handset 101b has moved into the wireless zone 105 constituted by the wireless base station 103, and the radio wave used for communication is detected. Radio base station 1
Switch to the same as 03. Furthermore, the handset 101b performs position registration with the wireless base station 103. The wireless base station 103 connects the slave unit 1 to the central processing unit 111 via the subscriber circuit 107.
01b is present in the wireless zone 105. The central processing unit 111 stores in the database 112 that the child device 101b exists in the wireless zone 105. At this time, when the extension telephone 108 makes a call to the handset 101b, the central processing unit 111 causes the database 1
It is read from 12 that the handset 101b exists in the wireless zone 105, and the handset 101b is transmitted to the radio base station 103.
Make a call to b. The wireless base station 103 is a child device 101b.
Connect to. When the handset 101b responds, the central processing unit 111 controls the private branch exchange 110 to set the extension telephone 108 and the handset 101b in a call state.

[0033]

As described above, according to the present invention, when communication is performed using a wireless mobile device, when the wireless mobile device exists within the zone of the cordless phone base unit, it is the same as the cordless phone base unit. When the wireless mobile device performs wireless carrier communication different from the wireless base station and the wireless mobile device moves from the zone of the cordless telephone master unit, wireless communication can be performed using the wireless base station. There is an effect that communication is possible even when moving from the communication zone, and even if all the radio channels handled by the radio base station are in use, a call can be made by returning to the vicinity of the cordless telephone base unit.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration of a first embodiment of the present invention.

FIG. 2 is a block diagram showing the configuration of a cordless telephone handset according to the first embodiment of the present invention.

FIG. 3 is a view showing C provided in the slave unit according to the first embodiment of the present invention.
The flowchart which shows the flow of the control operation at the time of making a call of PU.

FIG. 4 is a view showing C provided in the slave unit according to the first embodiment of the present invention.
The flowchart which shows the flow of the control operation at the time of the incoming call waiting of PU.

FIG. 5 is a flowchart showing a flow of control operation of the central processing unit in the first embodiment of the present invention.

FIG. 6 is a diagram showing the overall configuration of a second embodiment of the present invention.

FIG. 7 is a flowchart showing the flow of control operation of the central processing unit in the second embodiment of the present invention.

[Explanation of symbols]

 101 cordless telephone 101a parent device 101b child device 103 wireless base station 104, 105 wireless zone 106, 107, 109 subscriber circuit 108 extension telephone 110 private branch exchange 111 central processing unit 112 database

Claims (6)

[Claims] 1. A private telephone exchange system comprising a large number of subscriber circuits and a private telephone exchange that accommodates the subscriber circuits, wherein a cordless telephone is connected to a part of the subscriber circuits. Is connected to one of the wireless base stations, the transmission power of the wireless base station is higher than the transmission power of the base unit of the cordless telephone, and the wireless zone is arranged so as to include the wireless zone of the cordless telephone. The communication frequency of the radio base station is set to a frequency different from the communication frequency of the cordless telephone, and the cordless telephone slave unit is an identifier for communicating with the master unit of the cordless telephone to which the cordless telephone belongs. (I
The cordless telephone is provided with means for performing communication at the communication frequency of the radio base station and with high transmission power using the same identifier as in D), and the cordless telephone to which the cordless telephone belongs first when making a call. 2. A private telephone exchange system, comprising call origination control means for executing a communication starting procedure with the base unit and executing a communication starting procedure with the wireless base station when communication is impossible. 2. When the incoming call to the subscriber circuit to which the cordless telephone is connected is made to the private branch exchange, the connection procedure is first executed to the subscriber circuit, and the wireless communication is performed when communication is impossible. 2. The private telephone exchange system according to claim 1, further comprising incoming call control means for executing a connection procedure for a subscriber circuit to which the base station is connected. 3. The private branch telephone exchange is provided with a database for recording position information indicating whether or not each slave unit of a cordless telephone is in the wireless zone of the master unit from the history of communication immediately before the cordless telephone, When an incoming call is made to the subscriber circuit to which the telephone is connected, the database is referenced, and when the cordless telephone slave unit is in the wireless zone of the master unit, the connection procedure is executed for that subscriber circuit. When the wireless base station is not present, the wireless base station is provided with means for executing a connection procedure for the subscriber circuit to which the wireless base station is connected and giving the identifier of the slave unit to the subscriber circuit. 2. The private telephone exchange system according to claim 1, further comprising means for executing a call connection procedure for the slave unit by a wireless line according to the identifier. 4. The cordless telephone handset is provided with means for automatically executing a connection request to the database at a predetermined cycle, and the private branch telephone exchange has a position recorded in the database according to the connection request. 4. A private telephone exchange system according to claim 3, further comprising means for updating information. 5. A cordless telephone used in the private telephone exchange system according to claim 1. 6. A cordless telephone handset used in the private telephone exchange system according to claim 1. Description: