JPH11187448A - Mobile exchange - Google Patents

Abstract

PROBLEM TO BE SOLVED: To deliver speech contents to an opposite party, even if a radio channel is interrupted (squelch interrupt) with respect to the mobile exchange of a mobile communication system, where a mobile terminal makes a speech via the mobile exchange and a base station. SOLUTION: A mobile terminal stores information, denoting presence of a relief request of a call or a relief method when a radio channel to a base station 2 has been interrupted. When the radio channel with the base station 2 is interrupted while the mobile terminal 1 makes a speech, the mobile exchange 3 stores a call from a speech opposite party of the mobile terminal 1 to the base station 2 to conduct control, based on the information which denotes the presence of a relief request of a call or a relief method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a mobile switching system for a mobile communication system. When a call is made by a mobile terminal such as a mobile phone, if the mobile terminal moves while talking, the call level is reduced, the squelch is cut off, and if there is no alternative wireless zone, the call is interrupted.
This results in inconvenience to the other party, and improvement is desired.

[0002]

2. Description of the Related Art FIG. 12 is an explanatory view of a conventional example. In the figure,
80 is a mobile terminal, 81 is a wireless base station located in a wireless zone where the mobile terminal 80 is located first, 82 is a mobile switching center connected to a plurality of wireless base stations for control, and 83 is a communication partner of the mobile terminal 80. The wireless base station is located in a wireless zone of a certain partner mobile terminal 84. In this example, the call partner is a partner mobile terminal 84 that is wirelessly connected to the wireless base station 83.
However, this also includes a case where the telephone is a fixed telephone connected to the exchange by a wire.

[0003] A conventional call connection method for squelch disconnection (radio level degradation) will be described. First, when the mobile terminal 80 is located in the wireless zone of the wireless base station 81 and is connected to the partner mobile terminal 84 via the mobile exchange 82 and the wireless base station 83 to make a call, the mobile terminal 80 moves. The communication status deteriorates. The wireless base station 81 constantly monitors whether the squelch is disconnected (a in FIG. 12). When the mobile terminal 80 detects a level deterioration caused by moving out of the wireless range by this monitoring function, it notifies the mobile exchange 82. I do. Mobile switching system 8
2 receives this, determines whether or not there is another wireless zone (another channel or another wireless base station) adapted to the destination of the mobile terminal 80 (FIG. 12B). If so, the switch sends a channel switch request to the radio base station 81 (or another radio base station).
In response to this, the radio base station 81 switches the call trunk (provided corresponding to the channel) (c in FIG. 12) to rescue the call of the mobile terminal 80 (d).

If there is no other wireless zone, the mobile exchange 8
2 instructs the wireless base station 81 to disconnect the wireless communication, the wireless base station 81 disconnects the wireless connection with the mobile terminal 80, and sets the mobile terminal 80 to a busy state (wireless connection disabled state) ( F). At this time, the mobile exchange 82
Indicates a busy tone (B
T) is connected (g in FIG. 12), and a disconnection request signal is transmitted to the wireless base station 83 (h). Thereby, the wireless base station 83 disconnects the wireless communication with the partner mobile terminal 84 (FIG. 1).
2 i).

[0005]

In the conventional method, when the mobile terminal moves out of the radio range and the radio line is disconnected (squelch disconnected), if the zone cannot be switched, the call has to be disconnected. However, when the call is disconnected in this way, not only the user of the mobile terminal 80 but also the partner mobile terminal 84
There was also a problem that the call was suddenly interrupted and disconnected even for the user.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a mobile exchange which can transmit the contents of a call even if a radio line is disconnected during a call by a mobile terminal.

[0007]

FIG. 1 shows the principle of the present invention. In the figure, 1 is a mobile terminal, 2 is a base station that communicates with the mobile terminal 1 via a wireless line, 3 is a mobile exchange, and 30 is an operation for receiving a rescue from a user when the radio line is disconnected and registering a request for a rescue method. A rescue request registration unit 31 for performing rescue control when a wireless line is disconnected, and a subscriber 4 connected to the mobile exchange 3 (including a case via a trunk line) and holding information on each mobile terminal. Home memory, 7
Is a partner terminal of a call partner, and is either a mobile terminal or a fixed terminal. Reference numeral 5 in the subscriber home memory 4 denotes existing subscriber information (information such as equipment number and location information, registration information of existing services such as answering machine and transfer phone, etc.) used in the mobile telephone switching system; Is rescue request registration information in which a rescue method for disconnection of a wireless line according to the present invention is set.

[0008] When the user of the mobile terminal 1 wants to prevent disconnection when the wireless line is disconnected and to take rescue,
Dial a special number to register for relief. The mobile terminal 1 is connected to the mobile exchange 3 via the base station 2, and the rescue request registration unit 30 is activated. The rescue request registration unit 30 sends guidance to the mobile terminal 1 to inquire, and receives a response input from the mobile terminal 1 to request presence / absence of a rescue request when the wireless line is disconnected (referred to as a rescue request flag) and to request rescue. The type of rescue method in case (one of answering machine service, transfer service, temporary hold service, etc.) and necessary information corresponding to the rescue method (transfer destination information, hold time for temporary hold, etc.) Similarly, a response input from the mobile terminal 1 is received, and the contents are sent from the rescue request registration unit 30 to the subscriber home memory 4, and the subscriber home memory 4 stores the information in the rescue request registration corresponding to the mobile terminal 1. Information 6
Set as

When the user of the mobile terminal 1 is talking with the other party terminal 7 via the base station 2 and the mobile mobile switching center 3 while moving, the base station 2 detects the deterioration of the radio level of the mobile terminal 1. Then, the mobile switching center 3 searches for the wireless zone of the switching destination, and if it is found that it does not exist, the rescue control unit 31 is activated. The rescue controller 31 sequentially retrieves the rescue request registration information 6 of the mobile terminal 1 from the subscriber home memory 4. First, the presence / absence of a rescue request (rescue request flag) is detected, and if the flag is set, a transition is made to a connection service such as an answering machine service, a transfer service, a temporary hold service, etc. in accordance with the type of the rescue method. Also, this state is notified to the other party's terminal 7 so as not to be suddenly disconnected.

[0010]

2 and 3 show an operation sequence (part 1) and (part 2) for rescue request registration according to the present invention.
It is.

In FIG. 2, reference numeral 1 denotes a mobile terminal (indicated by mobile terminal A) used by subscriber A, hereinafter referred to as mobile terminal A, 3 a mobile exchange, and 4 a subscriber home memory. In FIG. 2, a radio base station (corresponding to the base station 2 in FIG. 1) is provided between the mobile terminal A and the mobile exchange 3 in the same manner as in the related art. Therefore, it is not shown in the figure.

Mobile station A disconnects radio link (squelch disconnection)
A special number for rescue request registration (for example, “15
Dialing "10") connects to the mobile switching center 3 (a in FIG. 2). When the mobile switching center 3 detects that it is a special number for rescue request registration, control of rescue request registration is started, and voice (talkie) is started. (“B” in FIG. 2) This guidance is, for example, “When a customer is moved to a place where radio waves do not reach, and wants to rescue the call, press the number 1. Please press the number 0 if you are ready to disconnect. "

On the other hand, when "0" or "1" is transmitted from mobile terminal A by a PB signal (push button signal) (FIG. 2c), the mobile exchange determines whether rescue is desired ("1") or not ("0"). ”)
(D), and if it is not desired, the mobile terminal A is disconnected (e), and the process is terminated. If rescue is desired, guidance (2) for selecting a rescue method is sent (f in FIG. 2). This guidance (2) is, for example, "What method do you want to use? When connecting to an answering machine service center, put the numeral 1; when the call is forwarded, put the numeral 2; In this case the number 3
Please press. It is the content.

On the other hand, when a PB signal for selecting a rescue method is sent from the mobile terminal A (g in FIG. 2), the mobile exchange determines whether the selected signal is an answering machine (numerical 1) (see FIG. 2). h) If the answering machine is an answering machine, the subscriber home memory 4 is inquired as to whether the subscriber is an answering machine (a subscriber who has registered to receive an existing answering machine service) (i). On the other hand, the subscriber home memory 4
Then, the existing subscriber information (5 in FIG. 1) of this subscriber is searched to determine whether this subscriber is registered as an answering machine service subscriber, and the result is sent to the mobile switching center 3. Based on the result, the mobile switching center 3 determines whether or not the subscriber is an answering machine service (j in FIG. 2). If the subscriber is an answering machine service, the rescue request registration information (corresponding to the subscriber in the subscriber home memory 4) ( As 6) in FIG. 1, information that the rescue request is present (request flag = “1”), the rescue type is the answering machine is registered (k in FIG. 2), and the connection with the mobile terminal A is disconnected.

If the result of the determination from the subscriber home memory 4 indicates that the subscriber is not an answering machine, the mobile switching center 3
Sends guidance (3) to the mobile terminal A (l in FIG. 2). This guidance (3) is, for example, "The customer has not subscribed to the answering service." In this case, the operation returns to the above-mentioned guidance (2) transmission operation to cause the mobile terminal A to select the rescue type again.

When a signal requesting transfer is received from the subscriber, the mobile switching center 3 determines whether or not it is an answering machine (k in FIG. 2).
Then, the processing shifts to FIG. 3 on the route determined as No, and it is determined whether or not the transfer is performed (m in FIG. 3). If the transfer is a transfer (when the signal is 2), the subscriber home memory 4 is inquired as to whether this subscriber is a transfer service subscriber (a subscriber who is registered to receive an existing call transfer service) (n). On the other hand, the subscriber home memory 4 searches the existing subscriber information (5 in FIG. 1) of this subscriber to determine whether or not this subscriber is registered as a call transfer service subscriber.
The result is sent to the mobile exchange 3. Upon receiving the result, the mobile switching center 3 determines whether this subscriber is a forwarding service subscriber (o in FIG. 3), and sends a guidance (4) to the mobile terminal A if the subscriber is a forwarding service subscriber (FIG. 3). p). If the user is not a transfer service subscriber, the process returns to the transmission of the guidance (2) in FIG.

This guidance is, for example, "Please input the transfer destination telephone number." When the transfer destination telephone number (0xx... Zzz) is transmitted from the subscriber as a PB signal (q in FIG. 3), the mobile switching center 3 sets the subscriber home memory 4
, As the rescue request registration information (6 in FIG. 1), rescue request = present, rescue type = transfer, transfer destination number = 0xx.
Is written (r in FIG. 3), and the connection with the mobile terminal A is disconnected.

If the signal that the subscriber wants to rescue is not either answering machine or transfer, it is determined whether the signal is on hold (s in FIG. 3), and if the signal is on hold, the current mobile terminal is stored in the subscriber home memory 4. The reservation time of A is inquired (t). If the mobile terminal A has previously registered the hold time as the rescue request registration information, the subscriber home memory 4 notifies the hold time. If it is not registered, a notice to that effect (unregistered) is given. Upon receiving this notification, the mobile exchange sends guidance (5) to mobile terminal A (u in FIG. 3). This guidance is, for example, "The hold time is currently set to XX seconds. To change the hold time, put a number after the dial tone and press sharp." If it is not registered, the system informs the user that "there is no hold time currently set" and sends guidance to prompt the user to enter a new hold time.

Thereafter, the mobile terminal A sends the hold time (120
When the PB signal is input (v in FIG. 3), the mobile exchange 3 sets the rescue request registration information (6 in FIG. 1) corresponding to the subscriber in the subscriber home memory 4 as the rescue request. = Yes, rescue type = Hold, Hold time = 120 seconds are written (w in FIG. 3), and the connection with mobile terminal A is disconnected.

If the rescue request from the subscriber and the rescue type sent are not any of the above answering machine, transfer, or hold, the guidance (6), for example, "The number is different,
Please enter it again. Is transmitted (x in FIG. 3).

FIG. 4 shows the structure of the registration information in the subscriber home memory. In the figure, reference numeral 5 denotes existing subscriber information, and 5a-
5f. 5a is a subscriber number, 5b is a subscriber position,
5c is the subscriber status (vacant / occupied), 5d is the qualification status of the answering service (start / stop), 5e is the qualification status of the call transfer service (start / stop), and 5f is the call transfer destination number. Reference numeral 6 denotes rescue request registration information according to the present invention.
6a to 6f. 6a is a rescue request flag (with / without), 6b is an answering machine service (with / without) in the rescue type, 6c is a transfer service (with / without),
6d is a hold service (with / without) in the rescue type, 6
e is the rescue transfer destination number when the transfer service is registered, 6
f indicates a hold time when a hold service is registered.

When the squelch break occurs while the rescue request registration information is registered as shown in FIG. 4, the rescue is performed according to the operation sequence shown in FIGS. FIG.
FIG. 8 to FIG. 8 show an operation sequence (No. 1) to (No. 4) when a squelch break occurs. 5 to 8, reference numeral 1 denotes a mobile terminal (referred to as a subscriber A); 2, a radio base station (same as 2 in FIG. 1) with which the mobile terminal 1 is communicating by radio;
Is a mobile exchange, 7 is a mobile terminal of the other party (referred to as subscriber B), and 8 is a wireless base station (or base station) to which the mobile terminal 7 of the other party is wirelessly connected.

When the subscriber A (mobile terminal 1) and the subscriber B (mobile terminal 7) move to a place where radio waves cannot reach during a call, the radio base station 2 determines whether squelch has been cut off ( In FIG. 5A, when the squelch is cut off, the mobile switch 3
Notify to The mobile exchange 3 searches for the wireless zone to which the subscriber A has moved (b), and in some cases, switches the call trunk to rescue the call (c, d). Whether the subscriber A requests the home memory 4 for call rescue, that is, a rescue request flag (6 in FIG. 4)
a) is inquired (e in FIG. 5). When the rescue request flag is received from the subscriber home memory 4, the content is determined (f in FIG. 5). If the rescue request flag is set to none, the mobile switching center 3 disconnects the radio (g in FIG. 5). ), And sends a busy tone (BT) to the subscriber A (g). In addition, a busy tone (BT) is also transmitted to the other party's subscriber B (i in FIG. 5), and a request is made to the other party's wireless base station 8 to disconnect from the subscriber B (j).

If the rescue request flag is set to "Yes", the mobile switching system 3 moves to FIG. 6 along the route, inquires the rescue type to the subscriber home memory 4 (a in FIG. 6), and receives it. Relief type is "1" (answering service)
(B). If it is "1" indicating an answering machine, the guidance (7) is transmitted (c in FIG. 6). This guidance has a content, for example, "Please leave a message at the answering machine center, so please leave a message." This guidance is provided, and the subscriber B is switched to a connection path to the answering machine service center 9 (FIG. 6).
D), the wireless connection with the subscriber A is cut off (same e), and a busy tone (BT) is connected to the subscriber A (f). Thereafter, the message from the subscriber B (the message to the subscriber A) is sent to the answering machine service center 9, where it is recorded (h in FIG. 6). Is disconnected. The connection from the mobile switching center 3 to the answering machine service center 9 is as follows.
This is realized by a method normally performed in the execution of a general answering machine service.

If the rescue type received from the subscriber home memory 4 is not "answering machine", then it is determined whether it is "transfer" (i in FIG. 6), and if it is a transfer, the connection with the subscriber A is disconnected. And sends a busy tone to subscriber A (j, j).
k). The process goes to FIG. 7 along the same route, and an inquiry about the transfer destination number (8e in FIG. 4) is made to the subscriber home memory 4 (a in FIG. 7). Guidance (8) is sent to (b). This guidance is, for example, "This phone will be forwarded." Next, the mobile switching center 3 connects to the received transfer destination number, switches the subscriber B of the other party to the transfer destination (c in FIG. 7), and disconnects the wireless line with the subscriber A (mobile terminal 1). (E), a busy tone is connected (f). On the other hand, a call is made between the transfer destination terminal and the subscriber B, and when the call ends, the connection with the transfer destination is cut off and the wireless line with the subscriber B is cut off.

When the rescue type received from the subscriber home memory 4 is neither "answering machine" nor "transfer", the reserving type is "hold", and the holding time (6f in FIG. 4) is stored in the subscriber home memory 4. An inquiry is made (f in FIG. 7). In this example, 120 seconds is returned as the hold time.

Next, moving to FIG. 8, the mobile switching center 3 starts measuring the hold time, and the time is set to the subscriber home memory 4.
Until the hold time (120 seconds) received from the subscriber A, the subscriber A (mobile terminal 1) moves to a place where the wireless condition is good and monitors whether the wireless level is restored and communication becomes possible. Therefore, it is determined whether the counted time has reached 120 seconds (a in FIG. 8), and if not, the guidance (10) is played (b).
The content of this guidance is "Please wait for a while." After this guidance, the wireless base station 8 of the other party B plays a hold tone to the other party B (mobile terminal 7) (e in FIG. 8). When the wireless base station 2 detects that the wireless status has been restored within the hold time (f in FIG. 8), the mobile switching center 3 is notified. The mobile switching center 3 determines whether or not the mobile terminal 3 has been restored within the hold time (g), and when it is recovered, resumes the call between the subscriber A and the subscriber B (h). When the hold time elapses without the wireless state being restored, the wireless communication with the subscriber A is disconnected to connect the terminal to the busy tone (b, c in FIG. 8), and guidance (11) is given to the other party B. Flow. This guidance is, for example, "Please call again after a while."

FIGS. 9 to 12 show the connection configuration in each rescue type. FIG. 9 shows a connection configuration in the case of an answering machine service center connection. FIG. 9 shows that subscriber A (mobile terminal 1) and subscriber B (mobile terminal 7) are in a squelch disconnected state during a call, and that subscriber A is operated according to the operation sequence shown in FIGS. This is the case where the answering service is registered in advance in the subscriber home memory as a rescue method. Is connected to the telephone answering service center 9 via the wireless base station (indicated by MBS) 8 and the mobile switching center 3 via the wireless line,
Voice mail service center 9 for subscriber B's message
Shows the state of recording. B. of FIG. After the recording, the answering machine service center 9 notifies the terminal of the subscriber A that the answering machine is recorded when the subscriber A has returned to the zone where the radio communication is possible (indicated by B in FIG. 9). . Upon receiving this, subscriber A dials a special number for answering machine playback from the terminal (same as above), and the message recorded from answering machine service center 9 can be played back and heard (same as above).

FIG. 10 shows the connection configuration for the transfer of the transfer service. FIG. 10 shows that the subscriber A is in a squelch-cut state while the subscriber A (mobile terminal 1) and the partner subscriber B (mobile terminal 7) are talking, and the operation sequence of FIG. 5 to FIG.
FIG. 10 shows a case in which a transfer service is registered in advance in the subscriber home memory for the subscriber A as a rescue method.
When the rescue method is transfer when the subscriber A is squelched and the rescue method is transfer, and the transfer destination is notified, the mobile switch 3 calls the transfer destination telephone number and is connected via the radio base station 8. Connection with the subscriber B who has made the connection.

FIG. 11 shows the connection configuration of the hold service.
FIG. 11 shows that subscriber A (mobile terminal 1) is in a squelch-cut state during a call with subscriber B (mobile terminal 7). This is a case where a hold service is registered in advance in the subscriber home memory as a rescue method. Indicates that the rescue method is suspended by the mobile exchange 3 making an inquiry to the subscriber home memory, and when the suspension time is also received, the guidance is transmitted to notify the current suspension time. Thereafter, the mobile exchange 3 counts the timer, waits for a recovery signal from the radio base station within the hold time, and returns to B. in FIG.
Represents a state where the signal level of the subscriber A has risen within the hold time and the call has been restored.

[0031]

According to the present invention, even when a mobile terminal moves out of the radio range during a call and there is no radio zone for switching, the call is suddenly disconnected and the call is disconnected. Can be prevented from occurring. Then, when the wireless line is disconnected, an arbitrary method can be pre-registered from among a plurality of methods as a rescue method, so that the user of each mobile terminal can select a convenient method. Further, when the transfer service is specified as the rescue method, the transfer destination can be freely changed, and the hold time can be arbitrarily changed even if the hold service is specified.

By using the answering machine service as a remedy method, the answering machine message can be reproduced and listened to later even if the radio line is disconnected (squelch disconnected). In addition, when the transfer service is used, the telephone call is transferred, so that the business can be conveyed. Further, if the hold service is used, the call can be restored if the user moves to a place where radio waves reach by the registration time.

[Brief description of the drawings]

FIG. 1 is a principle configuration diagram of the present invention.

FIG. 2 is a diagram showing an operation sequence (part 1) for rescue request registration according to the present invention.

FIG. 3 is a diagram showing an operation sequence (part 2) for repair request registration according to the present invention.

FIG. 4 is a diagram showing a configuration of registration information of a subscriber home memory.

FIG. 5 is an operation sequence when a squelch break occurs (No. 1)
FIG.

FIG. 6 is an operation sequence when a squelch break occurs (part 2).
FIG.

FIG. 7 is an operation sequence when a squelch break occurs (part 3).
FIG.

FIG. 8 is an operation sequence when a squelch break occurs (part 4).
FIG.

FIG. 9 is a diagram showing a connection configuration in the case of connection to an answering machine service center.

FIG. 10 is a diagram illustrating a connection configuration of a transfer service.

FIG. 11 is a diagram showing a connection configuration of a hold service.

FIG. 12 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 mobile terminal 2 wireless base station 3 mobile exchange 30 rescue request registration unit 31 rescue control unit 4 subscriber home memory 5 existing subscriber information 6 rescue request registration information 7 call partner terminal

Claims (6)

[Claims] 1. A mobile switching system of a mobile communication system in which a mobile terminal communicates via a mobile switching system and a base station, wherein the mobile terminal performs a call when a radio link between the mobile terminal and the base station is disconnected. The mobile terminal holds information indicating the presence or absence of a rescue request or the rescue method, and when the mobile terminal disconnects a radio link with the base station during a call, the mobile terminal communicates with the base station to the base station. Characterized in that the call is held and control is performed based on information indicating the presence or absence of the rescue request or the rescue method. 2. The method according to claim 1, wherein one of a plurality of services including an answering machine service, a transfer service, and a hold service is selected to indicate the rescue request as the rescue method requested from the mobile terminal. Mobile exchange characterized by information. 3. When receiving a request for an answering machine service as a rescue method from the mobile terminal according to claim 2,
Determining whether or not a normal answering machine service is registered by referring to existing subscriber information in the subscriber home memory, and only when there is registration, the rescue method is used as information indicating the rescue request. Mobile exchange. 4. The system according to claim 2, wherein when the mobile terminal is in a wireless line disconnected state and the information indicating the rescue method is an answering machine service, a line connected to the other party is connected to a center for performing an answering machine service. A mobile exchange characterized by recording messages from the other party. 5. The mobile terminal according to claim 2, wherein when the information indicating the rescue method is a transfer service, the mobile terminal is prompted to input a transfer destination, and when the transfer destination is input, the information indicates the rescue request. A mobile exchange characterized by the above-mentioned. 6. The mobile terminal according to claim 2, wherein when the information indicating the rescue method from the mobile terminal is a hold service, the mobile terminal is notified of a hold time currently registered, and the mobile terminal is notified of the hold time. Mobile switching system characterized in that time can be changed.