JPH09284844A - Exchange system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize practically effective reply service by reporting caller side information and time information stored in a storage means to a mobile communication terminal generating a service request to enhance a degree of reply freedom by a mobile communication terminal with respect to an unestablished call. SOLUTION: A detection means detects a state that no reply signal is generated from mobile communication terminals PS1-PSr for a prescribed time or over with respect to an incoming call to the mobile communication terminals PS1-PSr. A memory 19 stores connection destination information, caller information and time information of the incoming call in cross reference based on the result of detection of the detection means. A collation means collates the mobile communication terminals PS1-PSr generating a service request with the connection destination information stored in the memory 19. A notice means reports the caller information and the time information stored in the memory 19 to the mobile communication terminals PS1-PSr generating a service request based on the collation result by the collation means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a switching system for effectively providing a response service to a failed call to a mobile communication terminal such as a digital cordless telephone.

[0002]

2. Description of the Related Art As is well known, in a switching system such as the one mentioned above, when an external incoming call to a specific mobile communication terminal occurs, the mobile communication terminal is in a non-powered state, If the call is not answered before the preset time elapses because it is outside the wireless service area, etc., an unsuccessful call, such as a caller's telephone number or an incoming call, is generated. Information such as the time of day is stored in the storage means.

When the mobile communication terminal in which the unsuccessful call has occurred returns to a state in which it can communicate with the switching system, the switching system automatically stores the unsuccessful call in the storage means in response to a request from the mobile communication terminal. Whether or not there is stored information is searched, and when the information is stored, the information is wirelessly notified to the mobile communication terminal. In this case, the information is notified by being displayed on the display of the mobile communication terminal or by calling back from the exchange system to the mobile communication terminal.

However, in the conventional exchange system as described above, an operation of storing the information of the unsuccessful call in the storage means and a response service of notifying the stored information to the mobile communication terminal and calling back the information are performed by the exchange system. Since it is performed based on one-sided control of the mobile communication terminal, there is a problem that the request of the mobile communication terminal carrying side is not reflected at all. For this reason, for example, even if a call is made from the mobile communication terminal side based on the notified information, the mobile communication terminal is placed in a state in which the mobile communication terminal can communicate with the exchange system regardless of the other party or the circumstances of the mobile communication terminal side. The inconvenience that the unsuccessful call is always called back occurs every time the vehicle returns.

[0005]

As described above, in the conventional switching system, the response service to the unsuccessful call is
Since the operation is performed without considering the situation on the mobile communication terminal side, there is a problem in that there are many practical disadvantages.

Therefore, the present invention has been made in consideration of the above circumstances, and it is possible to increase the degree of freedom in response of a mobile communication terminal to a failed call and realize a practically effective response service. It is an object of the present invention to provide a very good exchange system.

[0007]

An exchange system according to the present invention is intended for use with a plurality of mobile communication terminals connected wirelessly. Then, detecting means for detecting a state in which a response signal is not generated from the mobile communication terminal for an incoming call to the mobile communication terminal for a predetermined time or more, and connection destination information of the incoming call based on the detection result of the detecting means. Storage means for storing calling side information and time information in association with each other, collation means for collating the mobile communication terminal for which a service request has been made with connection destination information stored in the storage means, and the collation result of this collation means. Based on the above, there is provided notifying means for notifying the mobile communication terminal having made the service request of the calling side information and the time information stored in the storage means.

According to the above-mentioned configuration, the connection destination information of the incoming call, the information of the sending side and the time of the incoming call to the mobile communication terminal in a state in which the response signal is not generated from the mobile communication terminal for a predetermined time or longer. Information is stored in association with each other, and the stored calling side information and time information are notified to the mobile communication terminal for which a service request has been made. Based on the information and the time information, it becomes possible to make a call without any restrictions, for example, to a necessary caller when it is necessary. Therefore, it is possible to freely respond to a failed call on the mobile communication terminal side. It will be possible to improve the degree of response and realize a practically effective response service.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Before describing an embodiment of the present invention, a digital cordless telephone system for business use as a premise of the embodiment described here will be briefly described. In FIG. 6, the public network 1
A digital PBX (private branch exchange) 14 in a business office 13 connected to a plurality of office lines (subscriber lines) 121 to 12n mainly includes trunk circuits 151 to 15n,
Exchange unit 16, line circuits 171 to 17m, main control unit 1
8, a memory 19 and a data highway 20.

The trunk lines 151 to 15n are connected to office lines 121 to 12n. The trunk circuits 151 to 15n detect incoming signals from the office lines 121 to 12n and the like, and have a function as a so-called office line interface.

The line circuits 171 to 17m are connected to radio base stations CS1 to CSm on the extension side. The line circuits 171 to 17m send a downlink control signal indicating an incoming call to the radio base stations CS1 to CSm when there is an incoming call from the office line 121 to 12n or an incoming call from an extension. When there is an outgoing request from the radio base stations CS1 to CSm, it operates to transmit an uplink control signal to that effect to the main control unit 18.

Further, the exchange section 16 includes a trunk circuit 15
The connection between the extension lines or between the extension line and the outside line is enabled by connecting the line circuits 171 to 17m with the line circuits 171 to 17m. The main control unit 18 controls the trunk circuits 151 to 15n, the exchange unit 16 and the line circuits 171 to 17m via the data highway 20 based on the operation program stored in the memory 19.

Further, the radio base stations CS1 to CSm can be connected to the mobile communication terminals PS1 to PSr via radio channels, respectively. These mobile communication terminals PS1
To PSr are connected to the public network 11 via each of the mobile communication terminals PS1 to PSr and the switching unit 16, and the mobile communication terminals PS1 to PSr can directly connect and control a wireless line to perform a call. .

Here, a radio channel set between the radio base stations CS1 to CSm and the mobile communication terminals PS1 to PSr has four slots for transmission and four slots for reception multiplexed in one frame, Further, TDMA (Time Divider) in which transmission slots and reception slots are temporally multiplexed.
ision Multiple Access)-TDD (Time Division Du
plex) system, one slot for transmission and one slot for reception.
A slot constitutes one wireless channel.

Each wireless channel includes a communication channel for transmitting and receiving voice and data, system information,
And a control channel for transmitting and receiving various control signals for making a call, receiving a call, setting a communication channel, and the like. Each of the radio base stations CS1 to CSm transmits system control information via a control channel.

The system control information includes a system call code set for each system. Each of the mobile communication terminals PS1 to PSr receives the received system call code and the system call code stored therein. The code is compared with the code, and if they match, the data is regarded as valid and received. If they do not match, the data is invalidated and discarded.

Each of the mobile communication terminals PS1 to PSr receives the system control information and, if the system call code of the radio base station CS1 to CSm to which it belongs is included, the logical control channel (LCCH). , And thereafter receives this LCCH and waits for an incoming call to itself.

When a call is made from mobile communication terminals PS1 to PSr, a call signal including a system call code is transmitted on a control channel to radio base stations CS1 to CSm, so that radio base stations CS1 to CSm are transmitted. The communication channel can be set on the CSm side, and the call can be started.

Therefore, the radio base stations CS1 to CSm and the mobile communication terminals PS1 to PSr having different system call codes are used.
If the call signals from the mobile communication terminals PS1 to PSr are received and the system call codes do not match, the data is discarded on the radio base stations CS1 to CSm side. ~ PSr cannot be called.

Similarly, in the case of a direct call between the mobile communication terminals PS1 to PSr, the calling mobile communication terminals PS1 to PSr are similarly connected.
The Sr uses this system call code to transmit a calling signal to the mobile communication terminals PS1 to PS on the called side, and waits for a response signal from the called side.

Next, referring to FIG. 7, mobile communication terminal PS1
Will be described in detail. In addition, other mobile communication terminals PS2 to P
Since Sr has the same configuration as that of the mobile communication terminal PS1, the description thereof is omitted. This mobile communication terminal PS1
Includes an antenna 21, a radio unit 22, a modem unit 23, a channel codec unit 24, a communication unit 25, a control unit 26, an operation unit 27, a transmission unit 28 for converting voice to a voice signal, and a voice signal for converting voice to voice. Output receiver 29, memory 3
0, display unit 31 and sounder 32 for generating various signal sounds
It is composed of

Of these, the radio section 22 is composed of a switch 33 for temporally switching the transmission / reception system, a reception section 34, a transmission section 35, and a synthesizer 36 having a crystal oscillator. The receiving unit 34 converts the frequency of the radio frequency signal received by the antenna 21, amplifies the signal component, extracts the signal component, and outputs the signal component to the modem unit 23. The transmitting section 35 is for transmitting a transmission output signal input from the modem section 23 on a carrier wave to be converted into a high-frequency signal and supplying the signal to the antenna 21 to be transmitted as a radio wave. In this case, the receiving unit 34 and the transmitting unit 35 obtain required frequency signals from the synthesizer 36.

The modem unit 23 demodulates the intermediate frequency signal output from the receiving unit 34 of the radio unit 22 to obtain a signal component. The modem unit 23 takes in the received signal from the radio unit 22 and sends it to the channel codec unit 24. Output, and quadrature phase modulation, for example, π / 4 shift QPSK (Qu
adratur Phase Shift Keying)
This is given to the transmission unit 35 of the wireless unit 22.

Further, the channel codec unit 24
Is a demodulated signal output from the modem unit 23 [TDMA
(Time-division multiple access) communication method] is output from a time slot that is assigned in advance, and PCM (Pulse Code Modulation) from the call section 25.
And (2) inserting the modulated and output signal into a time slot assigned to a signal based on the TDMA communication method in advance and outputting the signal to the modem unit 23.

The communication unit 25 is an input / output interface for signals in the audio signal band. The communication unit 25 has an AD (adaptive difference) PCM transcoder 37 and a PCM codec 38 and transmits signals under the control of the control unit 26. Talk part 28
The PCM signal is subjected to PCM modulation and supplied to the channel codec unit 24, and the demodulated PCM signal from the channel codec unit 24 is converted into a voice signal and supplied to the receiver 29.

Further, the memory section 30 is for holding data, and is provided therein with a password storage area for holding various passwords. In the personal identification number storage area, a system ID, which is a personal identification number, which is stored as an initial setting, indicates a base station to which the user belongs, an individual ID, which is a personal identification number for identifying the self, and a base station, which are stored. An extension number, a system call code, option information, a telephone number, a company code, and the like assigned to the communication terminal are stored.

The control unit 26 is responsible for controlling each component. In addition to various controls required for transmission and reception, the control unit 26 provides a security code required for connection control between base stations and mobile communication terminals. It has a password coincidence detection function unit for performing collation, a password memory control function unit, a password input identification function unit, and the like. Among them, the password match detection function unit detects the match by collating the various passwords stored in the password storage area in the memory unit 30 with the received various passwords.

Further, the security code memory control function unit stores and reads security code information in and from a security code storage area in the memory unit 30. Also,
The security code input identification function unit converts the security code input from the function key and the numeric keypad of the operation unit 27 and stored in the security code storage area unit in the memory unit 30 into a binary code by the security code memory control function unit. In order to store a predetermined number of bits in the personal identification number storage area in the memory unit 30 in accordance with.

The operation unit 27 includes a function key and a numeric keypad for performing operations such as calling and answering a call, dial number input, and an end call. These inputs are operated by operating the function key and the numeric keypad. I can do it. The system ID and the individual ID are controlled under the control of the control unit 26 by operating the setting key or the registration key of the function key and the operation of the numeric keypad.
Can be set and registered.

An embodiment in which the present invention is applied to the business digital cordless telephone system described above will be described below. FIG. 1 shows the digital PBX 1 described above.
4 shows the main part of the exchange part 16, the main control part 18, and the memory 19. And
As described above, the digital PBX 14 accommodates the mobile communication terminals PS1 to PSr via the radio base stations CS1 to CSm. The digital PBX 14 also houses a plurality of wire telephones 391 to 39p.

Next, FIG. 2 shows the details of the main control section 18. The main controller 18 has a call controller 40 that controls a call. The call control unit 40 responds to an incoming call by using the mobile communication terminals PS1 to PSr or the wire telephone 39.
Response signal monitoring unit 41 for monitoring / detecting the presence or absence of response signals generated from the mobile communication terminals PS1 to PS.
The service request signal monitor 42 that monitors and detects the service request signal generated from r and the response signal monitor 41 are activated when the absence of the response signal is detected, and the connection destination information, the calling party information, and the time information A storage control unit 43 for controlling storage of the same in the memory 19, and a service request signal monitoring unit 4
2 is equipped with an information collating unit 44 which is activated when a service request signal is detected and collates the mobile communication terminals PS1 to PSr that have made a service request with the connection destination information stored in the memory 19.

Further, the main control section 18 has the information collating section 4 mentioned above.
4 and the information notification control unit 45 that notifies the mobile communication terminals PS1 to PSr of the calling side information and the time information stored in the memory 19, and the mobile communication terminal P.
It has the communication control part 46 which manages communication with S1-PSr.

FIG. 3 shows a mobile communication terminal PS for an incoming call.
1 shows an example of connection destination information, calling side information, and time information stored in the memory 19 when there is no response from PSr. In FIG. 3, the mobile communication terminal P is used as the connection destination information.
The numbers S1 to PSr are stored, the telephone number of the sender, the service class, and the line type of the sender are stored as the sender information, and the date and time when the incoming call is made are stored as the time information. However, it goes without saying that the connection destination information, the calling party information, and the time information stored in the memory 19 are not limited to the example shown in FIG.

The operation of the above arrangement will be described below with reference to the flow charts shown in FIGS. First, the flowchart shown in FIG. 4 shows detection of presence / absence of a response from the mobile communication terminals PS1 to PSr to an incoming call, and storage of connection destination information, transmission side information and time information in the memory 19. That is, when started (step S1), the main control unit 18 constantly monitors the incoming call to the mobile communication terminals PS1 to PSr in step S2, and when the incoming call occurs, the main control unit 18 of the mobile communication terminals PS1 to PSr in step S3. A non-responsive timer (not shown) for measuring the non-responsive time is started.

After that, the main controller 18 proceeds to step S4.
Then, it is determined whether or not a response signal to the incoming call is generated from the mobile communication terminals PS1 to PSr, and when it is determined that the response signal is generated (YES), the incoming call process is executed in step S5. The processing is ended (step S6). Further, in step S4, the mobile communication terminals PS1 to PSr
When it is determined that the response signal to the incoming call is not generated from (YES), the main control unit 18 determines in step S7 whether the measurement time of the non-response timer has reached a predetermined value.

When it is determined that the time measured by the non-response timer has not reached the predetermined value (NO), the main controller 18 returns to the process of step S4. In addition, when the measurement time of the non-response timer reaches a predetermined value because the mobile communication terminals PS1 to PSr are not powered on or exist outside the wireless service area (YES). The main control unit 18 stores the connection destination information, the calling party information, and the time information in the memory 19 in step S8, and the process ends (step S6).

Further, the flow chart shown in FIG. 5 is for detecting a service request from the mobile communication terminals PS1 to PSr,
The notification of the calling side information and the time information stored in the memory 19 to the mobile communication terminals PS1 to PSr is shown. First, when the mobile communication terminals PS1 to PSr receiving an incoming call are started (step S9) for the reason such as being turned on or returning to the wireless service area, the main control unit 18
In step S10, service requests from the mobile communication terminals PS1 to PSr are constantly monitored, and when a service request signal is generated, in step S11, the mobile communication terminals PS1 to PSr that have requested the service are stored in the memory 19 and stored. Check the connection destination information.

In this case, as the service request signal generated from the mobile communication terminals PS1 to PSr, the location registration service performed first by the mobile communication terminals PS1 to PSr with respect to the digital PBX 14 may be used. ,
First call and call service and mobile communication terminals PS1 to PS
You may use the additional service etc. by special number operation from r.

When it is determined that the corresponding mobile communication terminals PS1 to PSr do not exist as a result of the collation (N
O), the main control unit 18 ends the process (step S12).
Is done. The mobile communication terminal PS1 corresponding to the collation result
If it is determined that ~ PSr exists (YES), the main control unit 18 reads the information from the memory 19 in step S13, and in step S14, the information is previously stored in the mobile communication terminal PS1 to the digital PBX 14. It is determined whether or not the information is requested to be notified in PSr units.

When it is determined that the information to be notified is not the requested information (NO), the main control unit 18 proceeds to step S1.
When it is determined that the information is requested to be notified by returning to the processing of step 3 (YES), the information is transmitted via the communication control unit 46 to the mobile communication terminals PS1 to PS1 in step S15.
Notify PSr. After that, the main control unit 18 determines in step S16 whether or not all the information notification processes have been completed, and if not completed (NO), the process returns to the process of step S13, and all the information notification processes are completed. When it is determined that the notification process has been completed (YES), the process ends (step S12).

Therefore, according to the above-described embodiment, when the mobile communication terminals PS1 to PSr that cannot communicate with the mobile terminal receive an incoming call, the digital PBX 14 automatically stores the connection destination information, the calling side information, the time information and the like in the memory 19. The mobile communication terminals PS1 to PSr are notified of the information stored in the memory 19 based on the service request from the mobile communication terminals PS1 to PSr that have become communicable. On the PS1 to PSr side, it becomes possible to make a call based on the notified information, for example, to a necessary caller without any restriction when necessary, so that the mobile communication terminal PS1 can respond to the unsuccessful call. ~ P
The degree of freedom of response on the Sr side can be increased, and a practically effective response service can be realized. In addition,
The present invention is not limited to the above-mentioned embodiments, and can be variously modified and implemented without departing from the scope of the invention.

[0042]

As described in detail above, according to the present invention,
It is possible to provide a very good exchange system that makes it possible to realize a practically effective response service by increasing the degree of freedom of response on the side of a mobile communication terminal with respect to an unsuccessful call.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a switching system according to the present invention.

FIG. 2 is a block configuration diagram showing details of a main control unit in the embodiment.

FIG. 3 is a diagram for explaining an example of information stored in a memory according to the same embodiment.

FIG. 4 is a flowchart shown to explain the operation of response detection and information storage processing in the same embodiment.

FIG. 5 is a flowchart shown to explain the operation of service request detection and information notification processing in the same embodiment.

FIG. 6 is a block diagram showing an outline of a business digital cordless telephone system.

FIG. 7 is a block diagram showing details of a mobile communication terminal in the system.

[Explanation of symbols]

 14 ... Digital PBX, 16 ... Exchange section, 18 ... Main control section, 19 ... Memory, 40 ... Call control section, 41 ... Response signal monitoring section, 42 ... Service request signal monitoring section, 43 ... Storage control section, 44 ... Information Collating unit, 45 ... Information notification control unit, 46 ... Communication control unit, PS1 to PSr ... Mobile communication terminal, CS1 to CSm ... Radio base station.

Claims (3)

[Claims] 1. A switching system in which a plurality of mobile communication terminals are connected to each other by radio, and detects a state in which no response signal is generated from the mobile communication terminal for a predetermined time for an incoming call to the mobile communication terminal. Detection means, storage means for storing connection destination information of the incoming call, calling side information and time information in association with each other based on the detection result of the detection means; and the mobile communication terminal for which a service request has been generated. The collating means for collating the connection destination information stored in the storage means, and the calling side information and the time information stored in the storage means on the basis of the collation result of the collating means, when the service request is generated. An exchange system, comprising: a notification means for notifying the mobile communication terminal. 2. The notifying means, based on the calling side information and the time information stored in the storage means, predetermined information selected in advance for each mobile communication terminal is used to move the mobile station when the service request is issued. The exchange system according to claim 1, wherein the exchange system is configured to notify the communication terminal. 3. The exchange system according to claim 1, wherein the calling party information includes any one of a telephone number, a service class, and a line type.