JP3288334B2 - Line restoration method and exchange - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an exchange connected to a radio telephone. The present invention also relates to a line restoration method when a communication line is disconnected.

[0002]

2. Description of the Related Art By using a radio telephone (portable radio telephone device), it is possible to make a telephone call while moving. The wireless telephone is connected to the wireless base station by radio (radio wave), and is connected to the exchange via the wireless base station. Then, the wireless telephone is connected to another telephone via the wireless base station and the exchange.

When a user of a wireless telephone moves during a call, the intensity (electric field level) of radio waves reaching the wireless telephone from the wireless base station may decrease. Thus, the place where the intensity of the radio wave reaching the wireless telephone is reduced is, for example, in a tunnel where a wireless base station is not installed or in a subway (road). If the intensity of the radio wave reaching the wireless telephone is reduced to a level at which communication is impossible, the communication line may be disconnected.

When a communication line is disconnected due to a decrease in radio wave intensity during a call, the user of the wireless telephone must call the same party again to restore the communication line after passing through a tunnel or the like. There is a problem that it does not. A technique for solving the above-mentioned problem of the re-call by the user is disclosed in Japanese Patent Application Laid-Open No. 6-252844.

In the technique disclosed in Japanese Patent Application Laid-Open No. 6-252844, a radio telephone is provided with a memory section and a recall section. The memory unit stores the last input telephone number. The re-calling unit automatically re-calls the telephone using the telephone number stored in the memory unit when the radio wave intensity is lowered during a call and the line is disconnected. As a result, the user of the wireless telephone does not perform the re-call process,
It is possible to automatically make a call again.

[0006]

However, Japanese Patent Laid-Open No. 6-2 / 1994
The technique disclosed in Japanese Patent No. 52844 has the following problem. According to the above technique, the radio telephone can measure the intensity of radio waves entering itself, but cannot measure the intensity of radio waves entering the radio telephone of the other party. For this reason, there is a problem in that when the other party passes through a tunnel or the like, the call cannot be automatically re-established.

[0007] As described above, the memory unit stores the last input telephone number. For this reason,
When the called user moves and the radio wave intensity is reduced, the recalling unit may recall a different party from the party with whom the call was made. Further, when the line is disconnected due to a decrease in radio wave intensity, a recall process is performed regardless of the user's intention. For this reason, there is a problem that the call is automatically re-established even when the line is disconnected due to a decrease in the radio wave intensity immediately before the end of the call.

Further, the above-mentioned automatic re-calling is performed only by a radio telephone equipped with the above technology. For this reason,
Users of wireless telephones not equipped with the above technology have to wait for a while to call the same party again or wait for a call from the other party after the line is disconnected due to the decrease in signal strength. There is. Accordingly, an object of the present invention is to provide an exchange that can simplify the operation of a telephone. Another object of the present invention is to provide a line restoration method capable of restoring a disconnected communication line regardless of the function of the telephone.

[0009]

In order to achieve the above object, a line restoration method according to a first aspect of the present invention detects that a communication line has been disconnected due to a decrease in the intensity of radio waves reaching a wireless telephone. A detecting step of storing the telephone number of the telephone whose telephone line has been disconnected after the detecting step, and a telephone line disconnected by using the telephone number stored in the storing step. A calling step of calling the telephone and restoring the disconnected communication line, the calling step comprising:
If the called phones are both wireless phones,
The method further comprises a step of first calling the calling side wireless telephone . Line restoration method according to the second aspect of the present invention
The law is enforced by reducing the strength of radio waves arriving at a wireless telephone.
A detecting step of detecting that the talk line has been disconnected;
After the outgoing process, the telephone number of the telephone
A storage step of storing in a memory;
Phone with disconnected phone line using the phone number
A calling process to make a call to restore the disconnected communication line;
Wherein the calling step comprises two disconnected call lines.
If only one of the phones is a wireless phone, the other
The step of making a call to another telephone first.
You. A line restoration method according to a third aspect of the present invention
The call line is disconnected due to the drop in the strength of the radio waves reaching the telephone.
A detecting step of detecting that the connection has been cut off; and
After that, the phone number of the telephone whose
A storing step of storing, and a telephone stored in the storing step
Use a number to make a call to a disconnected phone
Calling process to restore the disconnected call line.
In the calling step, the user of the telephone that has made the call earlier,
Will discriminator that determines whether or not there is a will to continue the call
And the user continues the call in the will determination step.
Call to the other telephone when it is determined that
Calling step.

According to these inventions, the disconnected telephone line can be restored without the telephone user performing the telephone line restoration process. Therefore, the operation on the telephone can be simplified.

In the calling step, the communication line is disconnected.
If only one of the two phones is a wireless phone,
The method may further include a step of calling the other telephone first.

The calling step includes a will determination step of determining whether or not the user of the telephone which has made the call has a will to continue the call. In the intention determination step, the user makes the call. If it is determined that there is an intention to continue, a step of calling the other telephone may be provided.

[0013] The calling step includes a step of calling the other telephone when the user of the telephone that has made the first call does not intend to continue the call in the intention determination step, The intent determination step may include a step of determining whether the user of the other telephone has an intention to continue the call.

An exchange according to a fourth aspect of the present invention is an exchange connected to a radio telephone via a radio base station and connecting a communication line of the radio telephone, wherein the radio transmission transmitted from the radio base station is provided. In response to a line disconnection signal indicating that the communication line has been disconnected due to a decrease in the intensity of radio waves reaching the telephone, the communication device includes a recovery unit that recovers the disconnected communication line, and the recovery unit responds to the line disconnection signal. Then
A memorizer who stores the telephone number of a telephone whose telephone line has been disconnected
And a telephone number stored in the storage means.
The call line to the disconnected telephone, and disconnect the call line.
Calling means for restoring, wherein the calling means
If the calling and called phones with disconnected lines are both
If it is a wireless telephone, first place a call to the calling wireless telephone.
Call .

According to the present invention, a disconnected telephone line can be restored without the telephone user performing a telephone line restoration process. Therefore, the operation on the telephone can be simplified.

An exchange according to a fifth aspect of the present invention has
Connected to the wireless telephone via the line base station,
An exchange for connecting a telephone line, wherein
The strength of the radio waves transmitted from the
Therefore, a line disconnect signal indicating that the telephone line has been disconnected
Provide a recovery means to recover the disconnected call line in response.
The restoration means responds to the line disconnection signal to communicate.
A memorizer who stores the telephone number of a telephone whose telephone line has been disconnected
And a telephone number stored in the storage means.
The call line to the disconnected telephone, and disconnect the call line.
Calling means for restoring, wherein the calling means
Only one of the two disconnected telephones is a wireless phone
Call the other phone first.
Features. The exchange according to the sixth aspect of the present invention
Connected to the wireless telephone via the line base station,
An exchange for connecting a telephone line, wherein
The strength of the radio waves transmitted from the
Therefore, a line disconnect signal indicating that the telephone line has been disconnected
Provide a recovery means to recover the disconnected call line in response.
The restoration means responds to the line disconnection signal to communicate.
A memorizer who stores the telephone number of a telephone whose telephone line has been disconnected
And a telephone number stored in the storage means.
The call line to the disconnected telephone, and disconnect the call line.
Calling means for restoring, wherein the calling means makes a call first.
Whether the user of the called phone is willing to continue the call
An intention discriminating means for discriminating whether or not there is said intention discriminating means
However, if the user determines that he / she wants to continue the call
And calling the other telephone.

[0017] The calling means may be configured to disconnect the call line.
If only one of the two phones is a wireless phone,
The other telephone may be called first.

The calling means includes a will determination means for determining whether or not the user of the telephone which has made the call has a will to continue the call. If it is determined that there is a will to continue, a call may be made to the other telephone. In this way, the line restoration process can be controlled according to the intention of the telephone user.

The calling means, if the intention discriminating means judges that the user of the telephone which has made the call earlier has no intention to continue the call, makes a call to the other telephone, and The means may comprise means for determining whether the user of the other telephone is willing to continue the call.

[0020]

[0021]

[0022]

Next, an exchange according to an embodiment of the present invention will be described with reference to the drawings. For example, as shown in FIG. 1, a plurality of wired telephones 100 are connected to an exchange according to the embodiment via a relay exchange (relay exchange) 300, and a plurality of wireless telephones 200 are connected via a wireless base station 400. Is connected. Although not shown, a plurality of transit exchanges 300 and wireless base stations 400 are provided. Further, the wired telephone 100 and the wireless telephone 200 may be connected to the exchange 500 via a plurality of relay exchanges 300 and the wireless base station 400, respectively.

Wired telephone set 100 is connected to transit exchange 300 by wire, and is connected to transit exchange 500 via transit exchange 300.
It is connected to the. The radio telephone 200 is connected to the radio base station 4
00 is connected by radio (radio wave) to the exchange 500 via the radio base station 400. Wireless telephone 200
The intensity (electric field level) of the radio wave arriving at the radio base station 4
It decreases by moving away from 00 or moving to a place where radio waves are difficult to reach. When the user of the wireless telephone 200 moves and the intensity of radio waves reaching the wireless telephone 200 decreases to a level at which communication is impossible, the communication line is disconnected.

The relay exchange 300 includes a plurality of wired telephones 1
00 and connected to the exchange 500 at the same time. The relay exchange 300 is, for example, a wired telephone 100.
The level of a signal (such as a voice signal) transmitted and received between the switch and the exchange 500 is kept constant. The wireless base station 400 is connected to the plurality of wireless telephones 200 by radio (radio wave), and is also connected to the exchange 500 at the same time. The radio base station 400
It relays signals transmitted and received between the wireless telephone 200 and the exchange 500. As shown in FIG. 1, the wireless base station 400 includes a communication unit 410, an electric field strength detection unit 420, and a notification unit 430.

Communication unit 410 transmits and receives radio waves to and from wireless telephone 200. Electric field strength detection section 420 detects (measures) the strength of a radio wave reaching radio telephone 200.
As described above, when the intensity of the radio wave arriving at the radio telephone 200 decreases, the intensity of the radio wave arriving at the radio base station 400 from the radio telephone 200 also decreases. For this reason, the electric field strength detection unit 420 measures the intensity of the radio wave transmitted from the
The intensity of the radio wave reaching 0 is measured.

The notification unit 430 detects that the radio field intensity from the radio telephone 200 drops to a level at which communication is impossible and suddenly becomes zero based on the detection result of the electric field intensity detection unit 420. Detects disconnection. Then, notification section 430 transmits to switch 500 a line disconnection signal indicating that the communication line has been disconnected due to a decrease in radio wave intensity.

The exchange 500 switches the lines of telephones (the wired telephone 100 and the wireless telephone 200) connected via the relay exchange 300 and the wireless base station 400 to enable a telephone conversation. The exchange 500, as shown in FIG.
Line switching unit 510, storage unit 520, pseudo terminal 530
And a control unit 540.

Line switching section 510 is connected to transit exchange 300 and radio base station 400. Then, the line switching unit 510 includes the transit exchange 300 and the radio base station 400.
Switch the line of the telephone connected via the to enable a call. The storage unit 502 stores the telephone number of the telephone whose telephone line has been disconnected in association with the telephone number.

After the communication line is disconnected due to a decrease in the radio wave intensity, the pseudo terminal 530 performs a line restoration process described later to restore the communication line. The control unit 540 controls the exchange 50
0 controls the operation of each of the above-described units to control the connection of the communication line. The detailed operation of the control unit 540 will be described later.

Next, the operation of the exchange 500 having the above configuration will be described. First, a user of a telephone enters a telephone number of a party to be talked to by a predetermined operation. This telephone number is transmitted to exchange 500 via transit exchange 300 or radio base station 400. Then, the telephone line is connected by the normal processing of the exchange 500. It is assumed that at least one of the calling and called telephones is the wireless telephone 200.

During a call, the user of wireless telephone 200
For example, when entering a tunnel or the like where the wireless base station 400 is not installed, the intensity of radio waves reaching the wireless telephone 200 decreases. Then, when the radio wave intensity decreases to a level at which communication is impossible, the communication line is disconnected.

As described above, radio base station 400 measures the intensity of the radio wave transmitted from radio telephone 200 to detect that the communication line has been disconnected due to a decrease in the radio wave intensity. Then, wireless base station 400 transmits a line disconnection signal to exchange 500. Control unit 540 of exchange 500 starts the number registration process shown in FIG. 2 in response to the line disconnection signal transmitted from wireless base station 400 via line switching unit 510.

First, control unit 540 causes storage unit 520 to store the telephone numbers of the two telephones to which the communication lines have been connected (step 101). The control unit 540 causes the storage unit 520 to store two telephone numbers, for example, as described below. When both telephones are the radio telephones 200, the control unit 540 stores 1 in the telephone number of the calling side and 0 (zero) in the telephone number of the called side and stores them in the storage unit 520. When one of the telephones is the wired telephone 100, the control unit 540 adds 1 to the telephone number of the wired telephone 100 and 0 to the telephone number of the wireless telephone 200, and stores the same in the storage unit 520.

Next, control unit 540 outputs a start signal to pseudo terminal 530 to start the pseudo terminal 530 (step 102), and ends the number registration process. The pseudo terminal 530 includes a control unit 540.
Starts the line restoration process shown in FIG. After a lapse of a predetermined time from activation, the pseudo terminal 530
Acquires the telephone number stored in the storage unit 520 (step 201). Note that the time during which the pseudo terminal 530 waits is the time during which a train or car passes through a tunnel or the like,
For example, it is set to one minute.

Next, the pseudo terminal 530 makes a call to the number with "1" among the obtained telephone numbers (step 20).
2). As mentioned above, the number 1 is 2
If one of the telephones is the wireless telephone 200, the number is the calling side, and if one is the wired telephone 100, the number is the wired telephone 100. 1 for the number of the wireless telephone 200
If it is marked, a call is made to the side (calling side) that had a reason to make a call. In addition, the wired telephone 100
In the case where 1 is attached to the number, a call is made to a person who is easily connected to the line.

Then, pseudo terminal 530 determines whether or not there is a response from the calling telephone within a predetermined time, that is, whether or not it is in an on-hook state (step 20).
3). When it is determined that there is no response (step 203; N
O), the pseudo terminal 530 determines that the user cannot answer the telephone, outputs an end signal to the control unit 540 (step 204), and ends the line restoration processing.

When it is determined that there is a response (step 20)
3; YES), pseudo terminal 530 checks whether or not the user of the answering telephone has an intention to continue the call (step 205). In order to confirm the user's intention, the pseudo terminal 530 sends a voice to, for example, a telephone that has responded, and allows the user to select whether or not the user has a will by a number or the like.

If it is determined that there is no intention to continue the call (step 205; NO), the pseudo terminal 530 controls the control unit 540.
(Step 206), and terminates the line restoration process. If it is determined that there is an intention to continue the call (step 205; YES), the pseudo terminal 530 stores
A call is made to the number with 0 added to the telephone numbers obtained from 20 (step 207).

Then, pseudo terminal 530 determines whether there is a response from the calling telephone within a predetermined time (step 208). If it is determined that there is no response (step 208; NO), the pseudo terminal 530 determines that the user cannot answer the telephone, and the control unit 54
An end signal is output to 0 (step 209), and the line restoration processing ends.

When it is determined that there is a response (step 20)
8; YES), pseudo terminal 530 outputs a line connection signal to line switching unit 510, and restores the telephone line of the two telephones (step 210). Note that the line switching unit 510
In response to the line connection signal from the pseudo terminal 530, the two telephone communication lines are connected. And the pseudo terminal 530
Outputs an end signal to the control unit 540 (step 21).
1) Terminate the line restoration processing.

Control unit 540 deletes the corresponding number stored in storage unit 520 in response to the end signal from pseudo terminal 530. Thereby, the storage unit 520
Storage capacity can be used efficiently.

As described above, it is possible to easily recover the communication line disconnected due to the decrease in the radio wave intensity. Also, as described above, the wireless base station 400 measures the intensity of the radio wave reaching the wireless telephone 200, and
Since 0 restores the communication line, the line can be restored without providing a special function to the telephone. further,
In order to confirm the intention of the telephone user to continue the call, it is possible to prevent the line from being restored when both users do not need to continue the call.

The control unit 540 informs the radio base station 400 that the communication line has been disconnected due to the decrease in the radio wave intensity.
May be detected from other than the measurement of the radio wave intensity by the radio wave. For example, a line disconnection process usually performed by the wireless telephone 200 may be detected via the wireless base station 4000 due to a decrease in radio field intensity, and the number registration process may be started.

In the number registration process, the control unit 540
After storing the telephone number in the storage unit 520, the pseudo terminal 530 may be activated after the strength of the radio wave reaching the wireless telephone 200 is restored to the strength at which communication is possible. However, in this case, the pseudo terminal 530 immediately acquires the telephone number from the storage unit 520 without waiting for a predetermined time to elapse after starting the line restoration processing. Thereby, pseudo terminal 530 can cause radio telephone 200 to receive a call without fail.

Step 2 of the above line restoration process
If it is determined in step 03 that there is no response from the telephone (step 203; NO), the pseudo terminal 530 may perform the process of step 203 again after a while. Further, step 20 of the above-mentioned line restoration processing
If it is determined in step 5 that there is no intention to continue the call (step 205; NO), the pseudo terminal 530 may confirm the intention to continue the call with the user of the other telephone. That is, the pseudo terminal 530 uses the telephone that has made the call earlier.
If the user determines that he does not intend to continue the call,
Make a call to the other telephone and use the other telephone
Now determines if he or she is willing to continue a call
May be. This allows one of the users to
If it is necessary to continue the call, the line can be surely restored.

Step 208 of the above line restoration processing
If the pseudo terminal 530 determines that there is no response from the telephone (step 208; NO), the pseudo terminal 530 notifies the user of the telephone that made the call in step 202 that the other party cannot answer the telephone. You may make it. As a result, the telephone user who responds in step 203 can know the reason why the line is not restored. Further, when it is determined that there is no response from the telephone at step 208 of the line restoration process (step 208; N
O), a message keeping system may be activated to leave a message of the user.

[0047]

As is apparent from the above description, according to the present invention, a telephone user can recover a communication line disconnected due to a decrease in the intensity of radio waves arriving at a wireless telephone without performing any special operation. be able to. Further, according to the present invention, a disconnected communication line can be restored without providing a special function to the telephone.

[Brief description of the drawings]

FIG. 1 shows a configuration of an exchange according to an embodiment of the present invention;
It is the schematic diagram which showed the example of its use.

FIG. 2 is a flowchart illustrating a number registration process performed by a control unit.

FIG. 3 is a flowchart illustrating a line restoration process performed by a pseudo terminal.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 wired telephone 200 wireless telephone 300 relay exchange 400 wireless base station 410 communication unit 420 electric field strength detection unit 430 notification unit 500 exchange 510 line switching unit 520 storage unit 530 pseudo terminal 540 control unit

Claims (12)

(57) [Claims] (1) When the strength of a radio wave arriving at a wireless telephone decreases.
A detecting step of detecting that the communication line has been disconnected, and after the detection step,
A storage step of storing the number in a memory, and using the telephone number stored in the storage step,
Place a call to the disconnected telephone and replace the disconnected line.
Calling process to recover, The calling step includes a calling side having disconnected the communication line and an incoming call.
If the other telephones are both wireless telephones, make a call
First making a call to the side wireless telephone,  A line restoration method characterized by that: Wherein the intensity of the radio wave decreases to reach the wireless telephone
Detecting that the communication line has been disconnected, and after the detection step, the telephone of the telephone having the communication line disconnected.
A storage step of storing the number in a memory; and a telephone call number using the telephone number stored in the storage step.
Place a call to the disconnected telephone and call the disconnected
Restoring an outgoing call , wherein the outgoing call is performed between the two telephones whose communication lines have been disconnected.
If only one of them is a wireless phone, the other phone
A line restoration method characterized by further comprising the step of : 3. The method according to claim 1, wherein the intensity of the radio wave arriving at the radiotelephone is reduced.
Detecting that the communication line has been disconnected, and after the detection step, the telephone of the telephone having the communication line disconnected.
A storage step of storing the number in a memory; and a telephone call number using the telephone number stored in the storage step.
Place a call to the disconnected telephone and call the disconnected
And a calling step of recovering, the call process, the user of the telephone originates a call earlier, call
Determination process for determining whether there is a will to continue
In the above-mentioned will determination step, the user has an intention to continue the call.
Call to the other telephone when it is determined that
Comprises, line recovery wherein the. 4. The method according to claim 1, wherein the calling step comprises the step of disconnecting the communication line.
If only one of the two phones is a wireless phone,
Comprising the step of calling ahead to the other phone line recovery method according to claim 1, characterized in that. 5. The calling step includes a determination step of determining whether or not the user of the telephone that has made the call has a will to continue the call. In the determination step, the user 5. The line restoration method according to claim 1, further comprising a step of calling the other telephone when it is determined that there is an intention to continue the call. 6. The calling step includes a step of calling the other telephone when the user of the telephone that has made the first call does not intend to continue the call in the intention determination step. The line restoration method according to claim 3 , wherein the intention determination step includes a step of determining whether a user of the other telephone set has an intention to continue the call. . 7. An exchange connected to a radio telephone via a radio base station and connecting a communication line of the radio telephone, wherein the telephone call is transmitted due to a decrease in intensity of radio waves transmitted from the radio base station and reaching the radio telephone. A recovery unit that recovers the disconnected communication line in response to a line disconnection signal indicating that the line has been disconnected, wherein the recovery unit responds to the line disconnection signal to disconnect the communication line.
Storage means for storing the telephone number of the story machine, using a telephone number stored in said storage means, through
Make a call to the telephone whose line has been disconnected and restore the line
Calling means, wherein the calling means has a calling side and a called
If the other telephones are both wireless telephones, make a call
A call originating first to a wireless telephone on the side . 8. A wireless telephone connected via a wireless base station.
An exchange for connecting a communication line of a wireless telephone, wherein the switch arrives at the wireless telephone transmitted from the wireless base station.
Indicates that the telephone line was disconnected due to a drop in signal strength
Restores a disconnected call line in response to a line disconnect signal
Recovery means, wherein the recovery means responds to the line disconnection signal to disconnect the telephone line.
Storage means for storing the telephone number of the story machine, using a telephone number stored in said storage means, through
Make a call to the telephone whose line has been disconnected and restore the line
Calling means, wherein the calling means comprises two telephones whose communication lines have been disconnected.
If only one of them is a wireless phone, the other phone
A switch that places a call first . 9. A mobile telephone connected to a wireless telephone via a wireless base station.
An exchange for connecting a communication line of a wireless telephone, wherein the switch arrives at the wireless telephone transmitted from the wireless base station.
Indicates that the telephone line was disconnected due to a drop in signal strength
Restores a disconnected call line in response to a line disconnect signal
Recovery means, wherein the recovery means responds to the line disconnection signal to disconnect the telephone line.
Storage means for storing the telephone number of the story machine, using a telephone number stored in said storage means, through
Make a call to the telephone whose line has been disconnected and restore the line
Calling means, wherein the calling means allows a user of the telephone which has previously made a call to make a call.
Means for determining whether there is a will to continue
The user is willing to continue the call.
A telephone call to the other telephone when it is determined that the other telephone is used. 10. The calling means, wherein when only one of two telephones whose communication lines are disconnected is a wireless telephone, a call is made to the other telephone first. 8. The exchange according to 7 . 11. The calling means comprises a will determination means for determining whether or not the user of the telephone which has made the call has a will to continue the call, wherein the determination means comprises: The exchange according to any one of claims 7, 8 , and 10 , wherein when it is determined that there is an intention to continue the call, the other telephone is called. 12. The calling means, wherein the will determination means comprises:
If the user of the telephone that made the call earlier determines that he or she does not intend to continue the call, the user of the other telephone calls the other telephone. The exchange according to claim 9 or 11 , further comprising means for determining whether or not there is a will to perform.