JP3105860B2 - Mobile communication system and communication state notification method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system connected to a mobile station such as a portable telephone or a PHS, and more particularly, to a mobile communication system for notifying a communication state when a calling side is a mobile station to a called side, and the mobile communication system. The present invention relates to a communication state notification method.

[0002]

2. Description of the Related Art FIG. 3 is a diagram for explaining an example of a connection method for mobile communication, in which a mobile station 1 and a service area 2 are connected.
a to 5a wireless base stations (hereinafter abbreviated as base stations) 2
, And an exchange 6 connected to these base stations 2 to 5,
And a fixed telephone 7 accommodated in the exchange 6. The base stations 2 to 5 are installed so that the service areas 2a to 5a partially overlap each other. Normally, a mobile station makes and receives a call and a call via a base station having the strongest electric field strength at a position where the mobile station is located.

[0003] For example, when the mobile station 1 is in the service area 1a, it can perform outgoing / incoming calls and talking via the base station 2 because it is in the service area 2a. When the mobile station 1 moves from 1a to 1b during a call with the fixed telephone 7, the mobile station 1 knows that it has approached the limit point of the service area 2a from the fact that the electric field strength from the base station 2 is low. By measuring the strength,
Find out if there is another base station nearby. If the base station 3 has an available free channel, the mobile station 1 performs channel switching to connect to the base station 3 and disconnect from the base station 2. Thus, when the mobile station 1 moves from 1a to 1d, it sequentially switches channels from the base station 2 to the base station 5. Mobile station 1
Exits the service area 5a, the mobile station 1 cannot talk because the base station is not present.

Conventionally, a communication state notification method in this type of mobile communication system has been used to notify both parties during a call when a mobile station during a call moves out of a service area. An example of a communication state notification method in a conventional mobile communication system is disclosed in Japanese Patent Laid-Open No. 6-86353.
No., published in Japanese Unexamined Patent Publication No. An outline flow of the communication state notification method described in this publication will be described with reference to FIG.

[0005] During a call between the mobile station and the fixed telephone, the mobile station constantly measures the electric field strength (step 20: abbreviated as S20). It is determined whether or not the electric field strength has decreased and the mobile station has reached the limit point of the service area (S21). If it is determined that the mobile station has reached the limit point, the presence or absence of an adjacent service area in the traveling direction of the mobile station is determined. Is searched (S22),
It is determined whether there is an adjacent service area (S23).
If there is a service area, the communication channel switching process is started (S24). When the switching of the communication channel is completed (S25), the communication between the mobile station and the fixed telephone is maintained and the communication is resumed (S26).

On the other hand, if there is no adjacent service area in the traveling direction in step S23, the mobile station and the fixed telephone that are talking are informed that "the mobile station is moving out of the service area, and the call is interrupted as it is. Is notified (S27). When recognizing that the mobile station has moved out of the service area (S28), the line used so far is released and the call is disconnected (S29).

[0007]

A first problem with the above-described conventional communication state notification method is that even when the mobile station is sufficiently within the service area, it is notified that the mobile station has reached the service area limit point. It is sometimes annoying.

[0008] The reason is that whether or not the mobile station has reached the limit point of the service area is determined by measuring the electric field strength and determining whether or not the measurement result is lower than a predetermined threshold. However, as a cause of the decrease in the electric field strength, there are cases where an obstacle passes between the base station and the mobile station for a moment, or a case where the angle of the antenna of the mobile station is inclined,
It cannot be said that the service area has reached the limit. This is because, even if the mobile station is sufficiently within the service area, the electric field strength is constantly changing, and each time the electric field strength becomes low, both parties during a call are notified of the fact.

[0009] The second problem is that when the mobile station reaches the limit of the service area and there is a service area adjacent in the traveling direction, the communication channel is switched. There is a time when both parties are silent.

[0010] The reason is that, in the case of an incoming call from a mobile station, the receiving side does not know that the other party is the mobile station. Therefore, at the time of channel switching, if there is no sound, the receiving side does not know why there is no sound, and if the silence time is long, the call may be cut off and the receiving side may end the call. Also, if the call channel switching fails and the call is interrupted, the receiving side does not know why the call was disconnected. In particular, if channel switching occurs immediately after the receiving side responds to a call from the mobile station, the receiving side suddenly enters a silent state, which may be mistaken for a mischief call. For this reason, silence during channel switching is problematic.

[0011] It is an object of the present invention to be able to notify a called party of an incoming call from a mobile station when a call is originated from the mobile station, and to switch the communication channel between the mobile stations so that the call is silent. During this time, the call partner of the mobile station can be notified that the mobile station is switching channels, and when the call is disconnected by the mobile station, the call is disconnected. It is an object of the present invention to provide a mobile communication system capable of notifying a cause immediately after a call and a communication state notification method thereof.

[0012]

The mobile communication system of the present invention comprises the following means.

A mobile communication system according to the present invention includes a plurality of radio base stations having a plurality of communication channels, a mobile station that performs radio communication with these radio base stations, and a connection to each radio base station by a wire line. Switch and a fixed line or multiple fixed telephones connected to this switch via a wired line.
In a mobile communication system including a plurality of mobile stations that perform wireless communication via a continuous wireless base station , the exchange includes a message sending unit that sends a message indicating various communication states registered in advance, The subscriber type is determined by referring to the database based on the caller number to be transmitted, and when the subscriber type is identified as a mobile station, a message indicating that the incoming call is from the mobile station is output to the receiving side. The caller type determining means for instructing the message sending means and the radio base station to be handed over to the communicating mobile station are selected. The message sending means is instructed to output a message indicating that the call is in progress. Communication channel switching determining means for instructing the message sending means to output a message indicating that the channel switching has failed and disconnecting the line; and a receiving side when the originating mobile station recognizes that the mobile station is out of the service area. Out-of-service determining means for instructing the message sending means to output a message indicating that the line is disconnected due to being out of the area.

A communication state notification method in a mobile communication system according to the present invention includes a plurality of radio base stations having a plurality of communication channels, a mobile station performing radio communication with these radio base stations, and An exchange connected to a base station via a wired line, and a plurality of fixed telephones connected to this exchange via a wired line or a wireless base station connected to the exchange via a wired line
In a communication status notification method in a mobile communication system for notifying a called subscriber of a mobile communication system in a mobile communication system including a plurality of mobile stations performing wireless communication via a communication system, a database is defined by a caller number received from a calling side. When the subscriber type is determined to be a mobile station, a message indicating that the incoming call is received from the mobile station is sent to the receiving side. It is also possible to select a radio base station to be handed over and, when it is identified that the communication channel switching operation has been started, send a message indicating that the communication channel is being switched to the receiving side, or If the radio base station to be handed over by the mobile station is selected and the switching operation of the communication channel fails after entering the switching operation, the receiving side is informed. A message indicating that the call channel switching has failed and the line is disconnected may be sent, or when the originating mobile station recognizes that the service area is out of the service area, the receiving side is out of the area. May be configured to send a message indicating disconnection of the message.

According to the present invention, when a call is made from a mobile station, the called party is notified that the other party is the mobile station. For this reason, the receiving side can communicate with the other party being aware that the other party is a mobile station. For example, it is possible to make a call while keeping in mind that the mobile station may move out of the service area and the call may be suddenly interrupted.

Further, when the mobile station moves out of the service area during a call and the call is disconnected, the mobile station moves out of the service area and notifies that the call has been disconnected. For this reason, the call partner can know that the call has been disconnected because the mobile station has moved out of the service area, and it can be expected that there is a high possibility that the call will not be established again after calling back.

Further, when the mobile station switches the communication channel, it notifies that the other mobile station is switching the communication channel. Therefore, the other party knows that the mobile station is switching the communication channel, and can wait until the switching is completed.

Further, if the switching is not performed normally and the call is disconnected while waiting for the completion of the switching of the communication channel, the other party is notified that the switching of the mobile station has failed. For this reason, the call partner of the mobile station knows that the mobile station has failed the call channel switching and the call has been disconnected, and can expect that there is a possibility that the call will be connected if the call is redone.

[0019]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, a mobile communication system according to the present invention includes a plurality of base stations 2 and 3 having a plurality of communication channels, a mobile station 1 performing wireless communication with these base stations, and An exchange 6 connected to the base station by a wired line and a plurality of fixed telephones 7 connected to the exchange 6 by a wired line
Be composed. In FIG. 1, for simplicity, only one of a plurality of fixed telephones is shown as an exchange, and this fixed telephone is shown.
A wireless base station connected to the exchange 6 by a wire line instead of the talk 7
A plurality of mobile stations (not shown) performing wireless communication via a ground station
May be configured. Although the database 8 for searching the subscriber type from the caller number is shown as an external device of the exchange, it may be provided in the exchange when the exchange is small in size such as a PBX.

The mobile station 1 includes a transmission / reception unit 11, an electric field strength measurement unit 12, a demodulation unit 13, a voice processing unit 14, a control unit 15 for controlling these units, and a microphone 16 for interfacing with humans. And a speaker 17 for performing transmission from a wireless signal to voice and from voice to a wireless signal. The electric field strength measuring unit 12 measures the electric field strength of the radio signal from the base station.

Since the configurations of base station 2 and base station 3 are the same, base station 2 will be described. The base station 2 includes a transmission / reception unit 21, an electric field strength measurement unit 22, a demodulation unit 23, a line I / F 24 for interfacing with an exchange, and a control unit 25 for controlling these units. It performs voice and voice-to-wireless signal transmission. The electric field strength measuring unit 22 measures the electric field strength of the radio signal from the mobile station 1.

The exchange 6 includes a base station interface (CI) 61 connecting the base stations 2 and 3, a fixed telephone interface (SI) 62 connecting the fixed telephone 7, and a CI /
It comprises a communication path switch 63 for connecting between SIs, a message transmission section 64 for transmitting messages indicating various communication states registered in advance, and a control section 65 for controlling these sections. Connects to a mobile station via a station.

The control unit 65 of the exchange 6 determines the subscriber type by referring to the database 8 based on the caller number received from the calling side, and when the subscriber type is identified as a mobile station, the control unit 65 informs the called side. On the other hand, a caller type judging unit 65a instructing the message sending unit 64 to output a message indicating an incoming call from the mobile station, and a base station to be handed over by the mobile station during communication are selected, and the communication channel is switched. When it is determined that the operation has been started, the message sending unit 64 is instructed to output a message indicating that the communication channel is being switched to the receiving side, and when the switching operation fails, the communication channel switching to the receiving side fails. The message output unit 6 outputs a message indicating that the line is disconnected.
And a message indicating that the mobile station on the calling side is out of the service area, and outputs a message indicating that the line is disconnected because the mobile station is out of the service area. An out-of-service determining unit 65c instructing the sending unit 64 is provided.

Next, the operation of the embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2 in the case where a call is made from the mobile station 1 to the fixed telephone 7.

When a call is made from the mobile station 1 to the fixed telephone 7, a line is connected via the path from the mobile station 1 to the base station 2 to the exchange 6 (S1), and a procedure for calling the fixed telephone to the exchange 6 is started. The exchange 6 controls the communication path switch 63 to call the fixed telephone 7 (S2). After the line connection, the control unit 65 of the exchange 6 receives the caller number from the calling side (S3), and identifies the subscriber type of the caller by the caller type determination unit 65a with reference to the database 8 (S3). S4).

If the incoming call is a call from a mobile station after answering the call via a fixed telephone, before the call path switch 63 sets the communication path between the mobile station 1 and the fixed telephone 7 according to an instruction from the control unit 65. Then, the message sending unit 64 and the fixed telephone 7 are connected, and the message sending unit 64 sends a message to the fixed telephone 7 to the effect that there is an incoming call from the mobile station (S).
5). The content of the message is, for example, "Incoming call from mobile phone" or "Incoming call from PHS".

After the transmission of this message, the communication path switch 63 sets the communication path of the mobile station 1 to the fixed telephone 7, and the telephone is in communication. During this call, the mobile station 1 and the base station 2 always measure the electric field strength in their respective electric field strength measuring units 12 and 22 (S
6). The mobile station 1 determines this electric field strength (S7), and when the electric field strength is lower than a predetermined value, it is determined that the mobile station 1 has reached the limit point of the service area of the base station 2, and the mobile station 1 determines in the traveling direction of the mobile station 1. The presence or absence of an adjacent service area is searched (S8).
It is determined whether there is an adjacent service area (S9), and if there is, the switching of the communication channel is started (S10). Here, it is assumed that the switching destination of the communication channel is the base station 3.

As a result, the communication channel switching determination section 65b of the exchange 6 recognizes that the switching of the communication channel has started, and during the switching of the communication channel, there occurs a period during which the communication cannot be performed for several seconds. The channel switching determining unit 65b connects the fixed telephone 7 and the message sending unit 64 with the call switch 63, and sends a message to the fixed telephone 7 from the message sending unit 64 that the call channel is being switched (S11). The contents of the message include, for example, "Channel switching is in progress" or "Please wait for a while" or a melody sound.

The communication channel switch determination unit 65b determines whether or not the channel switching is successful (S12). If the switching is completed normally, the communication path switch 63 disconnects the fixed telephone 7 from the message transmission unit 64 and moves. The line is maintained on the route of the station 1, the base station 3, the exchange 6 and the fixed telephone 7, and the call is continued (S13).

If the switching of the communication channel fails in S12, the communication becomes impossible, but the line is switched off without changing the line.
4 and the communication channel switching determination unit 65b causes the message transmission unit 64 to send a message to the fixed telephone 7 that the channel switching has failed and the communication will be disconnected (S1).
4). The content of the message is, for example, "call is terminated because channel switching failed." After sending this message, the line is released and the call is disconnected (S15).

On the other hand, if there is no adjacent service area in S9, if the out-of-service area determination unit 65c recognizes that the mobile station 1 has moved out of the service area (S16), the communication becomes impossible, but the line is not cut off. The fixed-line telephone 7 is connected to the message transmitting section 64 by the communication path switch 63, and the message transmitting section 64 transmits a message to the fixed telephone 7 to the effect that the mobile station has moved out of the service area and the telephone call is not possible ( S17). The content of the message is, for example, "the call is terminated because the mobile phone of the other party has moved out of the service area." After sending this message, the call is disconnected.

In this embodiment, the case where the receiving side is a fixed telephone has been described, but it goes without saying that the same operation as described above can be performed even when the receiving side is a mobile station such as a mobile phone.

[0034]

According to the present invention, when responding to an incoming call from a mobile station, it is possible to know in advance that the other party is a mobile station before the call, so that the conversation is interrupted or disconnected during the call. Calls can be made keeping in mind that they may be lost. In addition, since the mobile station of the other party notifies the receiving side of this state during the switching of the communication channel, it can be understood that the communication is temporarily disabled due to the switching of the communication channel.

Further, if the mobile station of the other party fails to switch the communication channel, this state is notified to the receiving side.
It can be seen that the call has been disconnected due to the failure of the call channel switching, and that if the call is made again, there is a possibility that the call can be made again. Furthermore, when the partner mobile station moves out of the service area, the called party is notified that the call has been disconnected because the mobile station has moved out of the service area. I understand.

[Brief description of the drawings]

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

FIG. 2 is a flowchart showing a processing flow of an embodiment of a communication state notification method in the mobile communication system of the present invention.

FIG. 3 is a diagram illustrating an example of a connection method of mobile communication.

FIG. 4 is a flowchart showing an example of a communication state notification method in conventional mobile communication.

[Explanation of symbols]

 Reference Signs List 1 mobile station 2-5 base station 6 exchange 7 fixed telephone 8 database 11/21 transmission / reception section 12,22 electric field strength measurement section 13,23 demodulation section 14 audio processing section 15,25,65 control section 16 microphone 17 speaker 24 line I / F 61 CI 62 SI 63 Call path switch 64 Message sending unit 65a Caller type judging unit 65b Call channel switching judging unit 65c Out of service judging unit

Claims (5)

(57) [Claims] 1. A plurality of wireless base stations having a plurality of communication channels, a mobile station performing wireless communication with these wireless base stations, an exchange connecting to each wireless base station via a wired line,
In a mobile communication system including a plurality of fixed telephones connected to the exchange via a wired line or a plurality of mobile stations performing wireless communication via a wireless base station connected to the exchange via a wired line, the exchange is registered in advance. A message sending means for sending a message indicating various communication states, and a subscriber type is determined by referring to a database based on a caller number received from a calling side, and a call is received when the subscriber type is identified as a mobile station. Caller type determining means for instructing the message sending means to output a message indicating that there is an incoming call from the mobile station; and a radio base station to be handed over by the communicating mobile station, and a call channel. When it is identified that the switching operation has been started, a message indicating that the communication channel is being switched to the receiving side is output. Communication channel switching determining means for instructing the message transmitting means to output a message indicating that the communication channel switching has failed and disconnecting the line to the receiving side when the switching operation has failed. Out-of-service determining means for instructing the message sending means to output a message indicating that the line is disconnected from the service area to the receiving side when the mobile station on the side recognizes that the service station is out of the service area. A mobile communication system characterized by the above-mentioned. 2. A plurality of wireless base stations having a plurality of communication channels, a mobile station performing wireless communication with these wireless base stations, and an exchange connected to each wireless base station via a wired line;
In a mobile communication system composed of a plurality of fixed telephones connected to this exchange via a wired line or a plurality of mobile stations performing wireless communication via a wireless base station connected to the exchange via a wired line, a communication state is provided to an incoming subscriber. In a communication state notification method in a mobile communication system for notification, a subscriber type is determined by referring to a database based on a caller number received from a calling side, and when the subscriber type is identified as a mobile station, a called side is determined. Transmitting a message indicating that the call is received from a mobile station to the mobile communication system. 3. A radio base station to be handed over by a mobile station during communication is selected, and when it is determined that a switching operation of a communication channel has been started, a message indicating that the communication channel is being changed is transmitted to the receiving side. 3. The communication state notification method in a mobile communication system according to claim 2, wherein: 4. A radio base station to be handed over by a mobile station during communication is selected, and when this switching operation fails after entering a switching operation of a communication channel, the switching of the communication channel to the receiving side fails and the line is disconnected. 4. A communication status notification method in a mobile communication system according to claim 2 , wherein a message indicating the communication status is transmitted. Wherein when the mobile station of the calling party recognizes that it is now out of range of the service area is characterized by sending a message indicating that the line is disconnected due to outside area with respect to the terminating claim 2 Or the communication state notification method in the mobile communication system according to 3 or 4 .