JPH08298686A - Mobile communication network - Google Patents

Abstract

PURPOSE: To apply call-back service to plural radio zones by storing the existence of an incoming call when a mobile station is out of the spheres of all radio base stations and accessing the incoming call from plural exchange devices connected independently of one telephone network. CONSTITUTION: At the time of receiving a call signal from a telephone set 3 to a portable telephone set 2, a private branch exchange (PBX) I1 transmits an incoming call signal to the portable telephone set 2, and when a response signal corresponding to the incoming call signal can be received, both telephone sets 2, 3 can be mutually connected. When an incoming call response signal can not be returned within fixed time, an out-of-sphere tone is sent to the telephone set 3 to inform that the called portable telephone set 2 is in an incoming disabled state. At the time of receiving a caller recall service setting specific dial number from the telephone set 3, the PBX I1 writes the terminal identification number of the telephone set 2 and the telephone number of the telephone set 3 in a storage device 6 and sends a service setting tone, so that the telephone set 3 is on-hooked and waits for recall. Thereby waiting time for call back can be shortened.

Description

Detailed Description of the Invention

[0001]

The present invention is used in mobile communication systems. The present invention is suitable for use in a private branch exchange. In particular, the present invention relates to a call back service to a calling terminal as a mobile station moves from a communication disabled state to a communication enabled state.

[0002]

2. Description of the Related Art When a called mobile station is not located in a predetermined radio zone, an incoming call signal to the called mobile station is not connected. At this time, when the called mobile station returns to a predetermined wireless zone in response to a request from the calling source terminal of the incoming call signal,
There is a service for calling back this calling terminal.

In this conventional example, as disclosed in Japanese Patent Laid-Open No. 4-337951, information about a call back service is stored in a storage device inside a private branch exchange (PBX), and a called mobile station is placed in a predetermined wireless zone. When returning, the calling terminal (service setting person) was called according to the information to connect to the called mobile station.

The same explanation can be applied to the case where the mobile station is turned off even though it is located in a predetermined radio zone.

[0005]

In the conventional call back system composed of a plurality of private branch exchanges as described above, when using this call back service, the private branch exchanges other than the private branch exchange other than the private branch exchange storing the service information are used. When the called mobile station returns to the wireless zone, there is a problem that the calling party cannot be called.

That is, a private branch telephone exchange is installed in each department in a relatively large enterprise, and the private branch telephone exchange is directly connected to the private branch telephone exchange by dial-in without passing through the exchange. In such a configuration, it is desirable that the mobile station connected to the private branch exchange can be connected to any of the plurality of private branch exchanges.

The present invention has been made against such a background, and an object thereof is to provide a mobile communication network to which a call back service can be applied across a plurality of radio zones. It is an object of the present invention to provide a mobile communication network capable of shortening the call back waiting time.
An object of the present invention is to provide a mobile communication network to which a call back service can be applied in a wide range.

[0008]

According to the present invention, there are provided a plurality of exchanges connected to one telephone network, radio base stations respectively connected to the plurality of exchanges, and radio base stations connected to the exchanges via radio lines. A storage device which comprises a mobile station to be connected, records the incoming call when the mobile station has an incoming call, and the mobile station is out of range to any of the radio base stations; One of the exchanges that has identified the mobile station when it entered the area of any one of the radio base stations is checked against this storage device, and if there is a record of an incoming call to that mobile station, A mobile communication network comprising a control means for making a call to this mobile station from one radio base station.

Here, the feature of the present invention resides in that the storage device is provided separately from the telephone network and is connected so as to be accessible from the plurality of exchanges.

The exchange may be a private branch exchange, and the telephone network may be a public telephone network.

The private branch telephone exchange may be installed in each department of one enterprise, and incoming calls to the private branch telephone exchange may be connected from the public telephone network without passing through a switchboard.

[0012]

When a plurality of radio base stations forming a plurality of radio zones are accommodated in a plurality of exchanges, a storage device commonly connected to these exchanges is provided, and an incoming call signal from the exchange to a certain mobile station is provided. However, when the mobile station does not exist in the radio zone of the radio base station accommodated by the exchange and the connection is impossible, the information of the mobile station is recorded in this storage device.

When a mobile station newly performs location registration in any of the radio zones of a plurality of radio base stations accommodated in a plurality of exchanges, the exchange accommodating the radio base station refers to the storage device. , It is confirmed whether an incoming call signal is transmitted from any of the exchanges to the mobile station. If the storage device has a record indicating that the incoming call signal has been transmitted, the terminal that originated the incoming call signal is called back, and if this terminal responds, the mobile station is connected.

As described above, since the plurality of exchanges manage information in common, if the mobile station can communicate in any of the wireless zones, the mobile station can be connected to the terminal making the call. The call back service can be applied across a plurality of wireless zones, and the call back waiting time can be shortened. Further, the call back service can be applied to a wide range.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of an embodiment of the present invention will be described with reference to FIG. FIG. 1 is an overall configuration diagram of a mobile communication network according to an embodiment of the present invention.

According to the present invention, the exchanges 1 ₁ and 1 ₂ connected to one telephone network 7, the radio base stations 4 ₁ and 4 ₂ connected to the exchanges 1 ₁ and 1 ₂ respectively, and the radio base stations 4 ₁ and 4 ₂ are provided with a mobile phone 2 as a mobile station connected via a wireless line, and the mobile phone 2 receives an incoming call, and the mobile phone 2 is connected to either of the radio base stations 4 ₁ and 4 ₂ . a storage device 6 that records that had this incoming call when in the out of range even for, exchange identified it when the cellular phone 2 enters the distance of any one of the wireless base station 4 ₁ and 4 ₂ One of 4 ₁ or 4 ₂ is collated with the storage device 6 and when the storage device 6 has a record of an incoming call to the mobile telephone 2, the one radio base station 4 ₁ or 4 ₂ transmits the mobile telephone 2 to the mobile telephone 2. 8 ₁ as a control means for making a call to Or 8 ₂ is a mobile communication network.

Here, a feature of the present invention is that the storage device 6 is provided separately from the telephone network 7 and is connected so as to be accessible from the exchanges 1 ₁ and 1 ₂ .

The exchanges 1 ₁ and 1 ₂ are private telephone exchanges, and the telephone network 7 is a public telephone network.

The private branch exchange is installed in each department of one enterprise, and incoming calls to the private branch exchange are connected from the public telephone network without passing through the switchboard.

Next, the operation of the embodiment of the present invention will be described with reference to FIG. FIG. 2 is a flow chart showing the operation of the embodiment of the present invention. The mobile phone 2 is a radio base station 4 ₁ or 4
₂ it is possible to perform communication in a radio zone 5 ₁ or 5 ₂ make, when it is called state, it transmits a location registration request signal carrying the terminal identification number to the PBX 1 ₁ or 1 _2. Storage device 6, accessible from the private branch exchange 1 ₁ or 1 _2.

In the embodiment of the present invention, the private branch exchange supplementary service according to the present invention is referred to as "caller call back service". In addition, the mobile phone 2 is in a call-disabled state (when it is out of the wireless zone 5 ₁ or 5 ₂ ,
Or the power is off).

As shown in FIG. 2, the PBX 1 ₁ receives the calling signal from the telephone 3 to the mobile phone 2. Then, the PBX 1 ₁ transmits an incoming call signal to the cellular phone 2 (S20). If the response signal to the incoming call signal can be received (S21), the mobile telephone 2 and the telephone 3 are connected (S38). However, when the incoming call response signal is not returned even after waiting for a fixed time (S21), the private branch exchange 1
₁ sends an out-of-range talk to the telephone 3 to notify that the called mobile telephone cannot receive the call (S22). Here, the PBX 1 ₁ receives the calling party call-back special dialed number for the service set from the telephone 3 (S23), writes the telephone number of the terminal identification number and the telephone 3 of the storage device 6 portable telephone 2 (S24 ), And sends a service set tone to the telephone 3 (S25). Here, the telephone 3 goes on hook and waits for a call back. When the mobile phone 2 moves into the wireless zone 5 ₂ , the private branch exchange 1 ₂ receives the location registration request signal (S26). The private branch exchange 1 ₂ collates the location registration request signal with the terminal identification number of the storage device 6 (S27). It recognizes and reads the telephone number of the telephone 3 from the storage device 6 (S28), and transmits an incoming call signal to call the telephone 3 (S29). Phone 3 answers the call,
When the response signal is returned (S30), the private branch exchange 1 ₂
Notifies the telephone 3 of the call by the "caller call back service" with a talk, and transmits an incoming call signal from the wireless base station 4 ₂ to call the mobile telephone 2 (S3).
1). When the incoming call to the mobile telephone 2 is successful and the incoming call response signal is received (S32), the private branch exchange 1 ₂ switches the talkie to the telephone 3 to a ringback tone (S33).
Then, when the cellular phone 2 answers the call, a response returns signal (S34), the PBX 1 ₂ stops ringback tone (S35), and connects the mobile phone 2 and the telephone 3 (S36) , The terminal identification number of the mobile telephone 2 and the telephone number of the telephone 3 are deleted from the storage device 6 (S3
7).

[0023]

As described above, according to the present invention,
The call back service can be applied across a plurality of wireless zones, and the call back waiting time can be shortened. Further, the call back service can be applied to a wide range.

[Brief description of drawings]

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

FIG. 2 is a flowchart showing the operation of the embodiment of the present invention.

[Explanation of symbols]

1 ₁ 1 ₂ Private branch exchange 2 Mobile phone 3 Telephone 4 ₁ 4 ₂ Radio base station 5 ₁ 5 ₂ Radio zone 6 Storage device 7 Telephone network 8 ₁ 8 ₂ Control unit

Claims (3)

[Claims] 1. A plurality of exchanges connected to one telephone network, radio base stations respectively connected to the plurality of exchanges, and mobile stations connected to the radio base stations via radio lines. , A storage device that records that this mobile station has an incoming call when the mobile station is out of service area to any of the wireless base stations; One of the exchanges that has identified it when it enters the range of the base station collates with this storage device, and when the storage device has a record of an incoming call for that mobile station, it moves from that one radio base station to this mobile station. A mobile communication network comprising a control means for making a call to a station, wherein the storage device is provided separately from the telephone network and is connected to the plurality of exchanges so as to be accessible. . 2. The mobile communication network according to claim 1, wherein the exchange is a private branch exchange and the telephone network is a public telephone network. 3. The private branch exchange is installed in each department of one business entity, and an incoming call to the private branch exchange is connected from the public telephone network without passing through a switchboard. 1. The mobile communication network according to 1.