JP3263589B2 - Mobile communication 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 simplified type in which a private branch exchange is connected to a cordless telephone, and a call is forwarded to a mobile station which changes a wireless zone in which the private branch exchange is located by using a call forwarding function of the private branch exchange. In particular, the present invention aims to reduce the number of lines of a private branch exchange.

[0002]

2. Description of the Related Art In recent years, mobile communication systems have rapidly spread within companies. In business offices and offices, mobile communication systems in which a cordless telephone is connected to a private branch exchange are widely used. In this system, a base station wired to a private branch exchange forms a wireless zone, and a mobile station wirelessly connects to this base station. The mobile station automatically or manually registers the location of the wireless zone where the mobile station is located in the private branch exchange through the base station. When the mobile station moves to another wireless zone, location registration is performed again, and the location registration data of the private branch exchange is updated. The private branch exchange transfers an incoming call to the mobile device based on the location registration data.

[0003] In a conventional mobile communication system using a private branch exchange, as shown in FIG. 4, a system cordless base station 6, 7 is connected to the private branch exchange 1, and a terminal 5 is connected via the extension telephone line 2. ing. The private branch exchange 1 includes a line control unit 11 for performing outgoing / incoming call processing, and a call transfer managing unit 15 for transferring a call to a designated destination when call transfer is set.

[0004] Base stations include a home base station 6 and a visitor base station 7. The home base station 6 is connected to the home line 3 normally used by the mobile device 8, and the home line 3 corresponds to the mobile device 8 on a one-to-one basis. The visitor base station 7
Is connected to the visitor line 4 that can be used at the destination where the mobile device 8 has moved.

[0005] In this mobile communication system, for example, when a call is made from the terminal 5 to the mobile station 8, if the mobile station 8 is located in the wireless zone of the base station 6 connected to the home line, Since the call transfer setting is not performed, the private branch exchange 1 transfers the incoming call to the home line 3 of the mobile device 8.

On the other hand, if the mobile station 8 is located in the wireless zone of the visitor base station 7 not connected to the home line, the private branch exchange 1 is set up because the call transfer setting is performed.
Transfers the incoming call to the visitor line 4 of the mobile device 8.

[0007] As described above, the mobile station 8 communicates with the home base station 6.
Can be received through the visitor base station 7 even when the user is away from the wireless zone.

[0008]

However, in a conventional mobile communication system using a private branch exchange, a visitor base station is used.
The incoming call to the line of the home base station
Since the setting to transfer to the local station is made,
Unique home base station, and
Real line must be assigned. This is the point
In reducing the number of lines in mobile communication systems
You.

[0009]

[0010]

[0011]

[0012]

[0013] The present invention is intended to solve such conventional problems, when constructing the same scale mobile communication system, Ki de it possible to reduce the actual number of lines of the PBX
And its object is to provide a mobile communication system that.

[0014]

Therefore SUMMARY OF THE INVENTION, in the mobile communication system of the present invention, the private branch exchange is provided with a virtual circuit management means for allocating a home line of each mobile device virtually.

[0015] Therefore, home to all of the real line without implementing the line can you to build a system using the visitor line, it is possible to reduce the number of actual line of private branch exchange.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention comprises a mobile station, a base station, and a private branch exchange, and the private branch exchange is a host corresponding to the mobile station based on a call transfer setting.
The incoming call to the over arm line, in a mobile communication system for transferring a visitor line mobile station has transitioned to the private branch exchange, each shift
Virtually assign one-to-one home lines to motives
Virtual line management means, and the virtual host assigned to the mobile device.
The incoming call to the system line
To the home line.
Build a mobile communication system without implementing a real line
It becomes possible.

[0017]

[0018]

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1) In the mobile communication system according to the first embodiment, as shown in FIG. 1, a home base station 6 of a host mobile station 8 is connected to a private branch exchange 1 via a home line 3. The connection is made, the visitor base station 7 is connected via the visitor line 4, and the terminal 5 is connected via the extension telephone line 2. The private branch exchange 1 includes a line control unit 11 for performing outgoing / incoming call processing.
And a home line management unit 12 for managing whether the host mobile station 8 exists in the wireless zone of the home base station 6.

The operation of this system will be described.

When the host mobile station 8 of the home base station 6 moves away from the radio zone of the home base station 6 and moves to the radio zone of the visitor base station 7, it executes a new location registration through the visitor base station 7. I do. As a result, the call transfer setting for the host mobile station 8 is performed in the private branch exchange 1.

When the home base station 6 detects that the host mobile station 8 has moved out of the wireless zone area due to a decrease in the received electric field strength of the transmission wave to be registered in the location of the host mobile station 8, the home base station 6 informs the private branch exchange. 1 home line manager 12
Tell In response to this, the home line management unit 12 releases the home line 3 to which the host mobile device 8 has moved out of the wireless zone as a visitor line.

For this reason, the guest mobile station 9 that has moved to the wireless zone of the base station 6 registers in the location through the base station 6, and is located in the wireless zone of the base station 6, and receives call transfer by the line 3. It becomes possible.

As described above, in the mobile communication system of this embodiment, when the host mobile station is out of the range of the home base station, the home line can be temporarily used as a visitor line. The number of stations can be reduced.

(Embodiment 2) In a mobile communication system according to a second embodiment, as shown in FIG. 2, a base station 21 and a home line 20 are virtually allocated to a mobile station 8 on a one-to-one basis. I have. The private branch exchange 1 includes a call transfer manager 15 for transferring a call to a destination specified based on a call transfer setting, and a virtual line manager 16 for managing a virtual home line.

The operation of the mobile communication system will be described.

In this mobile communication system, all the home lines 20 corresponding to each of the mobile units 8 are virtual. Mobile device 8
And the virtual home line 20 to which the mobile unit 8 is connected is managed by the virtual line management unit 16 of the private branch exchange 1.

Therefore, all of the actual base stations are
To become a visitor base station 7 connected to the visitor line 4. When the mobile unit 8 registers its location through the visitor base station 7, the call transfer management unit 15 of the private branch exchange 1 performs a call transfer setting so that the call of the mobile unit 8 to the virtual home circuit 20 is transferred through the visitor circuit 4. It is.

For example, when the terminal 5 designates the virtual home line 20 and makes a call to the mobile unit 8, the call transfer management unit 15 of the private branch exchange 1 sends the incoming call to the virtual home line 20 of the mobile unit 8 to the visitor line 4. Place a call by forwarding to.

As described above, in the system according to the second embodiment, by providing the private branch exchange with the virtual line management unit,
A mobile communication system can be constructed using a call transfer function of a private branch exchange without mounting a real home line, and the number of real circuits in the private branch exchange can be reduced.

(Embodiment 3) In a mobile communication system according to a third embodiment, as shown in FIG. 3, the private branch exchange 1 manages which base station 24 or 25 the mobile station 8 is located in. And a temporary hold function 14 for holding a call in progress.
And

The operation of the mobile communication system will be described.

Mobile station 8 located in the wireless zone of base station 24
Is talking to the other terminal through the line 22. At this time, when the mobile station 8 moves and moves away from the wireless zone of the base station 24, the base station 24, which has detected the reception level drop, informs the private branch exchange 1 and temporarily suspends the private branch exchange 1. The function 14 holds a call during a call of the mobile device 8.

When the mobile station 8 enters the radio zone of another base station 25 and performs location registration, the mobile station management unit of the private branch exchange 1
13 identifies the destination of the mobile station 8 and returns the call held in the temporary holding function 14 to the line 23 of the new base station 25. As a result, the mobile device 8 is in a call with the partner terminal via the base station 25, and can continue the call.

As described above, in the system according to the third embodiment, a handover can be easily realized by providing the private branch exchange with the call temporary holding function.

[0037]

As is apparent from the above description, the mobile communication system of the present invention implements a home line of a real line.
Without having a mobile communication system,
The number of actual lines connected to the private branch exchange can be reduced.

[0038]

[0039]

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a mobile communication system according to a first embodiment of the present invention;

FIG. 2 is a configuration diagram of a mobile communication system according to a second embodiment of the present invention;

FIG. 3 is a configuration diagram of a mobile communication system according to a third embodiment of the present invention;

FIG. 4 is a configuration diagram of a conventional mobile communication system.

[Explanation of symbols]

 1 Private branch exchange 11 Line control unit 12 Home line management unit 13 Mobility management unit 14 Hold function 15 Call transfer management unit 16 Virtual line management unit 2 Extension telephone line 3 Home line 4 Visitor line 5 Terminal 6 Home base station 7 Visitor base station 8 Host mobile station 9 Guest mobile station 20 Virtual home circuit 21 Virtual home base station 22, 23 circuit 24, 25 Base station

Claims (1)

(57) [Claims] And 1. A mobile station and a base station, and a private branch exchange, private branch exchange, based on the call forwarding setting, to the mobile station
The mobile device has transferred an incoming call to the corresponding home line
In a mobile communication system for transferring data to a visitor line, the private branch exchange has a home corresponding to each mobile one by one.
Equipped with virtual line management means for virtually allocating lines
The incoming call to the virtual home line assigned to the mobile
A mobile communication system for transferring to a visitor line based on a signal transfer setting .