JPH10322768A - Exchange and mobile communication system provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the time of communication restart by performing a call back service even in the case a call is disconnected by the hand-over failure of a moving terminal based on the record of terminal information during communication. SOLUTION: When the moving terminal 2x inside a radio service area 5n moves to the outside of the service area during the communication with a fixed terminal 3y and the call is disconnected, this exchange 1a for a station records the terminal information of the moving terminal 2x and the terminal information and housing position information of the fixed terminal 3y in a storage device 6a as call back information and reports the fixed terminal 3y to hang up the telephone and stand by. When the moving terminal 2x moves into the radio service area 51 and registers a position, the exchange 1a for the station calls back both of the moving terminal 2x and the communicating opposite terminal 3y based on the call back information inside the storage device 6a by position registration information and restarts the communication of both. Thus, the communicating opposite terminal saves the time and labor of originating calls for many times until the communication is restarted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a method for calling back to both a mobile terminal and a communication partner terminal when a communicating mobile terminal moves out of a radio service area and then returns to the radio service area. The present invention relates to an exchange and a mobile communication system including the same.

[0002]

2. Description of the Related Art Conventionally, when a communicating mobile terminal moves out of a wireless service area, a call in communication is disconnected, and the mobile terminal must return to the wireless service area and then make a call again. Also, if the called terminal is out of the radio service area or is in the radio service area and is turned off, when the terminal returns to the radio service area or turns on the power, the calling terminal is turned off. A call back service is provided.

As this conventional example, Japanese Patent Application Laid-Open No. 8-29868
No. 6 is disclosed. This example will be described with reference to FIG. In the figure, 11 and 12 are exchanges,
2 is a mobile phone, 3 is a telephone, 41 and 42 are wireless base stations,
Reference numerals 51 and 52 denote wireless service areas, 6 denotes a storage device, 7 denotes a telephone network, and 81 and 82 denote control units incorporated in the exchanges 11 and 12, respectively. The exchanges 11, 12
Is a private branch exchange (PBX).

When a call is received from the telephone 3 to the portable telephone 2 which is out of the wireless service or whose power is turned off, the exchange PBX 11 records information of the telephone 3 for calling back in the storage device 6. When the mobile phone 2 returns to the wireless service area 52 or turns on the power, the mobile phone 2 performs position registration with the wireless base station 42,
In response to this, the control unit 82 of the PBX 12 retrieves the information in the storage device 6 so that the telephone 3 can be called back.

[0005]

As described above, in the conventional system, when the called terminal outside the radio service area returns to the radio service area, or when the power of the called terminal is turned off, the called terminal turns on the power. When a call is disconnected due to a handover failure, the call is not returned.Therefore, the call must be made many times until communication can be performed again. Was hung.

[0006] An object of the present invention is to provide a call return service to a mobile terminal and a communication partner terminal when the mobile terminal becomes communicable when a call is disconnected due to a handover failure of the mobile terminal. And a mobile communication system having the same.

[0007]

In order to solve the above-mentioned problems, the present invention employs the following means. When the handover request from the mobile terminal (2x) fails, the exchange of the present invention includes a storage device (6a) for recording information necessary for making a call back, and a communication partner terminal (3y).
Voice trunk to hear announcements prompting the user to hang up and wait for the call to be recalled
a) and the mobile terminal (2x) is in the wireless service area (51).
), Control means (8a) for calling back to both the mobile terminal (2x) and the communication partner terminal (3y) when the location registration is performed. .

[0008] With the above configuration, if the mobile terminal in communication moves out of the radio service area and the call in communication is disconnected due to a handover failure, the exchange exchanges the information of the mobile terminal with the communication partner. The information of the terminal is associated and recorded in the storage device. When the mobile terminal that has been out of the wireless service area returns to the wireless service area and performs location registration, the exchange searches for information about the mobile terminal from information recorded in a storage device, and the information of the communication partner terminal is If it is recorded, a call is made to both the mobile terminal and the communication partner terminal.

Thus, the time from when the call is disconnected to when the communication is resumed can be reduced. Also, when the call is disconnected due to the handover failure of the mobile terminal, the communication partner terminal will hear an announcement urging the user to hang up and wait until the call is returned, so the communication partner terminal will wait until the communication is resumed. It is possible to save the trouble of calling many times.

In the mobile communication system of the present invention, when a handover request from a mobile terminal fails, a call is made to a storage device for recording information necessary for making a call and a communication partner terminal. A voice trunk to hear an announcement urging the user to hang up and wait until the mobile terminal returns to the wireless service area and performs location registration. It is characterized by comprising an exchange (1a) having means for performing a call back, a mobile terminal (2), and a radio base station (4) interposed between the exchange and the mobile terminal.

[0011] With the configuration described above, this mobile communication system can obtain the same operation and effects as those of the exchange of the present invention.

[0012]

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

FIG. 1 shows an embodiment of an exchange according to the present invention and a mobile communication system having the same. The mobile communication system includes an exchange 1a, a radio base station 41,
4n, fixed terminals 31 to 3p, and mobile terminals 21 to 2m. Here, the exchange 1a is a central office exchange accommodating a radio base station and fixed terminals.

When the handover of the communicating mobile terminal fails, the exchange 1a stores a storage device 6a for recording information for making a call back, and the call is disconnected due to the handover failure of the communicating mobile terminal. When the mobile terminal returns to the wireless service area, the voice trunk 9a for giving an announcement urging the user to hang up the handset and wait until the call is returned to the communication partner terminal. It has a control unit 8a for calling back both the terminal and the communication partner terminal. The radio base stations 41 to 4n have respective radio service areas 51 to 5n.

Next, the operation of the mobile communication system will be described with reference to FIG. 1 and FIG. When the mobile terminal 2x belonging to the wireless service area 5n shown in FIG. 1 moves out of the service area during communication with the fixed terminal 3y, handover cannot be performed and the call is disconnected (S2-1).
At this time, the exchange 1a records the terminal information of the mobile terminal 2x, the terminal information of the fixed terminal 3y, and the storage location information as return information in the storage device 6a (S2-2). Then, an announcement urging the user to hang up the telephone and wait until the call is returned is heard using the voice trunk 9a (S2-3). When the mobile terminal 2x moves into the wireless service area 51 and performs location registration (S2-4), the exchange 1a searches for call back information in the storage device 6a based on the terminal information in the location registration information (S2-
5) The mobile terminal 2x and the fixed terminal 3 with which it communicated
y are called back to both sides (S2-6, S2
-7), both responded (S2-8, S2
-9) The exchange 1a resumes the communication between them.

Next, in the same radio service area,
A case where the mobile terminal enters and exits the service area will be described. FIG. 3 is a configuration diagram of the mobile communication system in that case. As a result, the mobile communication system becomes the exchange 1a.
A radio base station 4 connected to the exchange 1a; a radio service area 5 of the radio base station 4;
The mobile terminal 2 and the telephone 3 are registered in the location. The exchange 1a has a storage device 6a for recording information necessary for calling back when the mobile terminal 2 moves out of the wireless service area 5 while the mobile terminal 2 and the telephone 3 are communicating, and the telephone 3 A voice trunk 9a for listening to an announcement urging the user to hang up and wait until a call is made, and both the mobile terminal 2 and the telephone 3 when the mobile terminal 2 returns to the wireless service area. It has a control unit 8a for calling back.

Next, the operation of the mobile communication system will be described with reference to FIG. 3 and FIG. If the mobile terminal 2 in the wireless service area 5 shown in FIG. 3 moves out of the service area while communicating with the telephone 3, handover cannot be performed, so a call disconnection request is sent from the wireless base station 4 to the exchange 1a (S4). -1). When the call is disconnected due to the failure of the handover, the exchange 1a stores the return information
a (S4-2), an announcement is sent from the voice trunk 9a to the telephone 3 (S4-3), and the telephone 3 waits for disconnection. When the portable terminal 2 returns to the wireless service area 5, a location registration request is sent from the wireless base station 4 to the exchange 1a (S4-4). Exchange 1a
Retrieves the return information stored in the storage device 6a from the location registration information (S4-5), and sends a call setting signal to both the portable terminal 2 and the telephone 3 (S4-5).
6, S4-7) and response signals from both (S4-8, S4
The communication is resumed with the reception of -9).

In FIG. 1, the communication partner with the mobile terminal 2x is the fixed terminal 3y. However, the same applies to the mobile terminal. Although the fixed terminal 3y is made to listen to the announcement from the voice trunk 9a, it may be made to listen to the tone.

Although the exchange 1a is a central office exchange accommodating a radio base station and fixed terminals in FIG. 1, it may be a private branch exchange 1b connected to a public network 7 as shown in FIG. In this case, the private branch exchange 1b is provided with a storage device 6b for recording information for making a call back when handover of a mobile terminal in communication fails, as in the central office exchange 1a. When the call is disconnected due to a failure of the handover of the mobile terminal, a voice trunk 9b for giving an announcement prompting the user to hang up the handset and wait until a call is returned to the communication partner terminal; When the mobile terminal returns to the area, it has a control unit 8b for calling back both the mobile terminal and the communication partner terminal.

[0020]

As described above, according to the present invention,
The call disconnected due to the handover failure of the mobile terminal,
At the time of returning to the wireless service area, the communication can be resumed by calling back, so that the time from when the call is disconnected to when communication can be resumed can be reduced.

[Brief description of the drawings]

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

FIG. 2 is a sequence diagram showing an operation of the mobile communication system shown in FIG.

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

FIG. 4 is a sequence diagram showing an operation of the mobile communication system shown in FIG.

FIG. 5 is a configuration diagram showing another embodiment of the mobile communication system according to the present invention.

FIG. 6 is a configuration diagram showing an embodiment of a conventional mobile communication system.

[Explanation of symbols]

 1a Switchboard 2, 21-2m Mobile terminal (portable terminal) 3, 31-3p Fixed terminal (telephone) 4, 41-4n Wireless base station 5, 51-5n Wireless service area 6a, 6b Storage device 7 Public network 8a, 8b Control unit 9a, 9b Voice trunk

Claims (2)

[Claims] When a handover request from a mobile terminal fails, a storage device for recording information necessary for making a call back, and hang up the telephone until a call is made to a communication partner terminal. When the mobile terminal returns to the wireless service area and registers its location,
An exchange comprising: control means for calling back both the mobile terminal and the communication partner terminal. 2. When a handover request from a mobile terminal fails, a storage device for recording information necessary for making a call back, and hang up the telephone until a call back to a communication partner terminal is made. When the mobile terminal returns to the wireless service area and registers its location,
An exchange provided with control means for making a call back to both the mobile terminal and the communication partner terminal; a mobile terminal; and a radio base station interposed between the exchange and the mobile terminal. Mobile communication system.