JPH10304450A - Mobile radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the voice mail service in a system, even in the state of channel congestion. SOLUTION: If each of mobile stations 4, 5 makes a call to a control station 1 and receives a request of a voice mail from the control station 1, the mobile station sends a voice mail. The control station 1 requests the voice mail from a caller mobile station, when the channel between a base station and the control station 1, is in congestion after the call from the caller mobile station and then receives and stores the voice mail. Thus, the control station accumulates the voice mail, even when a called mobile station cannot receive the call due to channel congestion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile radio communication system, and more particularly, to a mobile radio communication system for performing radio communication between a plurality of mobile stations and a base station through a radio channel.

[0002]

2. Description of the Related Art FIG. 13 is a diagram showing a conventional mobile radio communication system disclosed in, for example, Japanese Patent Application Laid-Open No. 4-45621. The mobile radio communication system shown in FIG. 13 includes a base station 6 connected to a general subscriber's telephone network 8 via a subscriber line, and a mobile station 7 connected to the base station 6 via a radio line. The base station 6 has a line control device 61 and a wireless device 62.

The line controller 61 includes a subscriber line interface unit 610 for interfacing with a subscriber line, a subscriber line interface unit 610, and a wireless device interface unit 6.
12, a line switch 611 for interconnecting the voice storage devices 114, a wireless device interface unit 612 for interfacing with the wireless device 62, a subscriber memory 613 for storing the absence / absence registration of the mobile station 7, etc. A voice storage device 614 for receiving and storing, a system information storage device 615 for storing the state of an idle channel line of the system, the presence or absence of an alternate reception message for the mobile station 13, and a control unit 616 for controlling the entire line control device 61. Have.

A mobile station 7 interfaces with a radio device 62 to transmit and receive voice and control signals to and from the base station 6 by radio, a voice storage device 73 for storing a message sent from the base station 6, and an absence It has a subscriber interface unit 74 for inputting registration settings and the like, and a mobile station control unit 72 for controlling the entire mobile station 7.

Next, the operation will be described. In the mobile radio communication system shown in FIG. 13, when the subscriber leaves the mobile station 7, the subscriber sets the absence registration through the subscriber interface unit 74 of the mobile station 7. Mobile station controller 7
2 recognizes the absence registration setting,
An absentee registration signal containing an absentee registration request code is transmitted on the control channel through 1 in place of the telephone number of the general subscriber telephone network 8.

The line control device 61 of the base station 6
Are received by the wireless device 11 and analyzed by the wireless device interface unit 62. When the absence registration signal is received, control unit 616 changes the information of the corresponding mobile station in subscriber memory 613 and registers the absence.

When a call is received from the general subscriber telephone network 8 to the base station 6, the subscriber interface unit 610 detects the call. When notified to the control unit 616 that the reception is possible, the subscriber interface unit 610 responds to the general subscriber telephone network 8 and receives the subscriber number of the mobile station from the caller by the second dial. . The control unit 616 checks the received subscriber number against the contents of the subscriber memory 613, and if the subscriber number of the mobile station 13 subscribes to the own system, performs a connection operation.

At this time, if it is known from the contents of the subscriber memory 613 that the mobile station 7 of the corresponding subscriber number is absent, the line controller 61 of the base station 6 allocates a free radio channel. The normal connection operation for calling the mobile station 7 is not performed. The control unit 616 controls the line switch 611 to connect the voice storage unit 614 to the subscriber line with an incoming call to the mobile station 7 registered with the absence, through the subscriber interface unit 610, and to control the voice storage unit 614.
Transmits a message transmission request to the mobile station 7 to the caller of the general subscriber telephone network 8. The voice storage device 614 stores the caller's message sent through the subscriber line.

Further, the system information storage device 615 includes:
Operational information as to whether or not each wireless line is vacant and information as to whether or not a message to the mobile station 7 registered as absent is being received by proxy are stored. The control unit 616 periodically checks the contents of the system information storage device 615, and when the number of vacant channels of the wireless line is equal to or larger than the set value, if the message to the mobile station 7 registered as absent is received by proxy,
The message is sent. The control unit 616 sends a channel designation reception for transmitting an alternate reception message on a control channel by the wireless device interface unit 612 and the wireless device 62.

When the mobile station 7 receives the channel designation signal, if it is in the absence registration state, the mobile station 7 starts a radio line connection operation to receive a message on the channel designated by the control of the mobile station control section 72. In the line control device 61 of the base station 6, when a wireless line for transmitting an alternate reception message is connected to the mobile station 7, the control unit 616 sends the voice storage device 614 to the wireless device interface unit 612 through the line switch 611. The mobile station 7 connects to the mobile station 7 and sends the received message to the mobile station 7. On the other hand, the mobile station 7
1 to receive the message transmitted from the base station 6 and store the message stored in the voice storage device 73 of the mobile station 13.

[0011]

Since the conventional mobile radio communication system is configured as described above, a message is stored (voice data) when starting from a telephone connected to a subscriber line or by registering absence from a mobile station. In a system in which a mobile station roams between a plurality of base stations, when a line is congested between base stations, or when a transmitting base station is empty but a receiving base station is closed. In the case of the radio line congestion, transmission to the receiving base station could not be performed due to the event of system line congestion, and the user had to wait until a line between the base stations became available. Therefore, it is only necessary to have a free line, but even if there is a free line, the call cannot be made unless a response is received from the called mobile station. There was a problem that the mail service could not be sufficiently received.

SUMMARY OF THE INVENTION An object of the present invention is to provide a mobile radio communication system capable of realizing a voice mail service on a system even in a line congestion state, in order to solve the above-described problem of the conventional example.

[0013]

Means for Solving the Problems The above-mentioned problems are solved,
In order to achieve the object, a mobile radio communication system according to the present invention includes a plurality of mobile stations, a plurality of base stations communicating with each other through a radio line, and each base station connected to each base station by a wire line. In a mobile radio communication system including a control station that controls communication between a plurality of mobile stations through each base station, each mobile station includes a transmitting unit that transmits to the control station;
Voice mail transmitting means for transmitting voice mail to the control station when a voice mail request is issued from the control station after the transmission by the transmitting means, wherein the control station is a transmitting side of the plurality of mobile stations. When the mobile station sends a call to the called mobile station by the sending means, the line congestion occurs in the communication path between the calling mobile station and the called mobile station formed between the control station and the plurality of base stations. Means for judging the presence / absence of a call, and requesting a voice mail from the originating mobile station when the judgment result indicates that there is line congestion, and storing the voice mail sent by the voice mail transmitting means. And storage means for performing the operation.

According to the present invention, each mobile station transmits a voice mail if there is a voice mail request from the control station after the transmission to the control station, and the control station transmits the outgoing mobile station among the plurality of mobile stations. When a call is sent to the called mobile station from, if there is line congestion in the communication path between the calling mobile station and the called mobile station formed between the local station and multiple base stations, the call is sent. Since the voice mail is requested to the mobile station on the side and received and stored, the voice mail is stored in the control station even if the receiving mobile station cannot receive a call due to a line congestion state. Since the originating mobile station does not need to make another call, it is possible to realize a voice mail service on the system even in a line congestion state.

[0015] A mobile radio communication system according to the next invention comprises a plurality of mobile stations, a plurality of base stations for communicating with each mobile station via a radio line, and a plurality of base stations connected to each base station by a wire line. In a mobile radio communication system including a control station that controls communication between a plurality of mobile stations through a base station,
Each mobile station transmits a broadcast mail to the control station when the control station requests a voice mail after the broadcast transmission by the broadcast transmission means. Voice mail transmitting means, and the control station, when there is a broadcast by the broadcast transmitting means from the transmitting mobile station of the plurality of mobile stations to the plurality of receiving mobile stations, Determining means for determining the presence or absence of line congestion in a communication path between a transmitting mobile station and a plurality of receiving mobile stations formed between a control station and a plurality of base stations; and determining means for each receiving mobile station. When a result of the determination that there is line congestion is obtained, a voice mail is requested to the calling mobile station, and the voice mail sent by the voice mail transmitting means is stored for the called mobile station with line congestion. And means.

According to the present invention, each mobile station transmits a voice mail if a voice mail request is received from the control station after the broadcast transmission to the control station. When a mobile station broadcasts to a plurality of called mobile stations, a communication path between the calling mobile station and the plurality of called mobile stations formed between the own station and the plurality of base stations. If there is line congestion, voice mail is requested from the originating mobile station and the voice mail is received and stored for the receiving side mobile station in the line congestion state. Voice mail is stored in the control station even if there is a called mobile station that cannot perform the call, which eliminates the need for the calling mobile station to make another call for the called mobile station that could not broadcast. , When broadcasting Even in the state it is possible to realize a voice mail service on the system.

The mobile radio communication system according to the next invention is characterized in that the judging means obtains a judgment result that there is line congestion when a connection with the called mobile station cannot be established within a predetermined time.

According to the present invention, when the connection with the called mobile station cannot be established within a predetermined time, the result of the judgment that there is line congestion is obtained. It is possible to smoothly transition to a voice mail service without having to wait.

[0019] In the mobile radio communication system according to the next invention, the control station further includes a monitoring means for monitoring the presence or absence of a line vacancy, and is stored in the storage means when the presence of a vacant line is confirmed by the monitoring means. Voice mail notification means for notifying the voice mail.

According to the present invention, the control station monitors the presence or absence of a line vacancy and notifies the stored voice mail when it is confirmed that there is a line vacancy. No need to retrieve mail,
This makes it possible to improve the efficiency of the system.

In the mobile radio communication system according to the next invention, the control station further includes a voice mail notifying means for notifying the voice mail stored in the storage means when each mobile station requests a voice mail notification. It is characterized by having.

According to the present invention, the control station notifies the stored voice mail when there is a voice mail notification request from each mobile station. Therefore, according to the receiving system of the called mobile station, The control station only needs to accumulate voice mail by extracting voice mail as appropriate,
It is possible to distribute the load on the system.

In the mobile radio communication system according to the next invention, each mobile station further includes a registration request transmitting means for transmitting a position registration request for specifying a location among a plurality of base stations to the control station. The control station further has a setting for setting the number of voicemails that can be registered according to a predetermined rank in the transmission source mobile station of the registration request transmission means according to the position registration request transmitted by the registration request transmission means. Means, and a number notification means for notifying the source mobile station of the number of voice mails that can be registered set by the setting means.

According to the present invention, a position registration request for specifying a location among a plurality of base stations is transmitted from the mobile station to the control station, and the control station transmits to the transmission source mobile station in advance in accordance with the position registration request. The number of voicemails that can be registered according to the determined rank is set, and the number of voicemails that can be registered is notified to the source mobile station. At the same time, the number of stored voice mails is limited, so that the memory capacity of the control station can be effectively used.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a mobile radio communication system according to the present invention will be described below in detail with reference to the accompanying drawings.

(Embodiment 1) First, the system configuration will be described. FIG. 1 is a block diagram showing a mobile radio communication system according to Embodiment 1 of the present invention. In the mobile radio communication system shown in FIG. 1, for example, base stations 2 and 3 are connected to control station 1 via wired lines LN1 and LN2, respectively, and mobile stations 4 and 5 are connected to base stations 2 and 3, respectively. Is configured to perform wireless communication via a wireless line. Here, the mobile station is two of the mobile stations 4 and 5, and the base station is the base station 2,
The two stations 3 will be taken as an example. It is assumed that two mobile stations, mobile stations 4 and 5, are shown as representatives. The mobile stations 4 and 5 each have an antenna 4 for wireless communication.
1,51.

The control station 1 includes a control unit 11 and a voice storage device 1
2, circuit switch 13, wired line interface unit 1
4, a position registration recording unit 15 and the like. Control unit 11
Is a unit that controls the entire system, registers the mobile stations 4, 5, etc. in the location registration recording unit 15 in association with the base stations 2, 3, and when the line is congested with the voice storage device 12. , Storage of voice mail and retrieval of voice mail after line congestion is resolved.

The voice storage device 12 stores the voice mail in association with the calling mobile station and the called mobile station under the control of the control unit 11, and the circuit switch 13 controls the control unit 11, the voice storage device 12, and the wired line. The interface units 14 are mutually connected. The wired line interface unit 14 manages an interface with the wired line interface units 213 and 313 of the base stations 2 and 3 connected through the wired lines LN1 and LN2, respectively.

The base station 2 includes a channel control device 21, a radio device 22, an antenna 23, and the like. Line controller 2
1 is a wireless device interface 211 for interfacing with the wireless device 22, a wire line interface 21
3, a line switch 212 for interconnecting the wireless device interface units 211, and a wired line L connected to the control station 1.
Wired line interface 2 for interfacing with N1
13 and the like. The wireless device 22 performs wireless communication with each mobile station in an area managed by the base station 2 via the antenna 23. The antenna 23 is a unit that captures and transmits radio waves.

The base station 3 includes a line control device 31, a radio device 32, an antenna 33, and the like. Line controller 3
Reference numeral 1 denotes a wireless device interface unit 311, which interfaces with the wireless device 32, and a wired line interface unit 31.
3, a line switch 312 interconnecting the wireless device interface units 311 and a wired line L connected to the control station 1
Wired line interface unit 3 for interfacing with N2
13 and the like. The wireless device 32 performs wireless communication with each mobile station in an area managed by the base station 3 via the antenna 33. The antenna 33 is a unit that captures and transmits radio waves.

Next, the operation will be described. FIG. 2 is a diagram for explaining a sequence between stations when a transmission request is made according to the first embodiment. In the following description, the transmitting side is the mobile station 4 and the receiving side is the mobile station 5. When the originating mobile station 4 originates a call to the terminating mobile station 5, the originating mobile station 4 first makes a transmission request to the base station 2, and the control station 1 connecting the base station 2 transmits the request. Call originating mobile station 4
And the incoming call request is transmitted to the receiving mobile station 5.

However, if the line between the control station 1 and the base station 3 is in a line congestion state, the incoming call request to the incoming mobile station 5 cannot be made, and a response to the incoming request is obtained from the incoming mobile station 5 within a fixed time. If not, this call will be invalidated by a timeout. In this case, the control station 1 inquires of the originating mobile station 4 for a voice mail acceptance request, and the originating mobile station 4 sends a voice mail to the control station 1 in response to the inquiry. Since the voice mail is stored in the control station 1, when the line congestion state between the control station 1 and the base station 3 is resolved, the voice mail can be heard at the receiving mobile station 5 thereafter.

Further, the above-mentioned operation will be concretely described.
FIG. 3 is a flowchart for explaining the operation correspondence between stations when a call is requested according to the first embodiment. When the originating mobile station 4 originates a call to the terminating mobile station 5, the originating mobile station 4 transmits a transmission request signal to the base station 2 (step S1). At this time, in the base station 2, the transmission request signal is received by the wireless device 22 through the antenna 23, transmitted to the wired line LN1 through the wireless interface unit 211, the circuit switch 212, and the wired interface unit 213, and transmitted to the control station 1. Notified.

In the control station 1, the input transmission request signal is received by the control unit 11 through the wire line interface unit 14 and the circuit switch 13. Control unit 11
When the mobile station 4 recognizes that it is a transmission request from the mobile station 4 to the mobile station 5 based on the input transmission request signal (step S101), it responds to the transmission side mobile station 4 with a transmission acceptance signal (step S101). (S102), the base station in which the mobile station 5 is registered is searched by an inquiry to the registration recording unit 15 (step S103).

As a result, when it is confirmed that the base station in which the mobile station 5 is registered is the base station 3, the control unit 11 further measures time until a certain time elapses (step S104). An empty channel on the wired line LN1 between the station and the base station 2 and an empty channel on the wired line LN2 between the own station and the base station 3 are searched (step S105). This search is performed in order to connect a communication path between the base station 2, the control station 1, and the base station 3 by a wired line.

The control station 1 secures an empty channel on the wired line LN1 between the own station and the base station 2 and an empty channel on the wired line LN2 between the own station and the base station 3 within a predetermined time. (Step S105), the communication paths between the base station 2, the control station 1, and the base station 3 are connected by the free channels of the wired lines LN1 and LN2 (Step S106). Than this,
Communication between the transmitting mobile station 4 and the receiving mobile station 5 is performed.

On the other hand, if a certain time elapses before the line connection (step S104), at least the wired line LN2 between the own station and the base station 3 is closed, and this line connection operation is performed Treated as a congestion state. That is, the control unit 11 sends a voice mail acceptance request signal to the mobile station 4 through the wired line LN1 and the base station 2 to make an inquiry about voice mail (step S107). Thereafter, the control unit 11 controls the circuit switch 13 to connect the audio storage device 12 to the wired line LN1.

The originating mobile station 4 receives a call acceptance signal from the control station 1 through the base station 2 (step S).
2) Until the above-mentioned fixed time elapses, the determination as to whether or not the line connection with the receiving side mobile station 5 is possible (step S3) and the inquiry determination of the voice mail acceptance request when the line is congested (step S4) are repeatedly executed. Is done. At this time, if the wired line LN2 between the control station 1 and the base station 3 is in a line congestion state, as described above, a voice mail acceptance request signal arrives after a predetermined time (step S4).
To respond to the inquiry, a voice mail is transmitted to the control station 1 (step S5). Of course, if the operation shifts to the line connection enabled within a certain time (step S3), communication with the called mobile station 5 is performed (step S6).

When the control station 1 receives a voice mail from the originating mobile station 4 via the base station 2 after the inquiry in step S107 (step S108).
The data is stored in the voice storage device 12 through the circuit switch 13 (step S109). Then, the line between the control station 1 and the originating mobile station 4 is disconnected.

Here, a method of storing voice mail will be described. FIG. 4 shows the voice storage device 12 according to the first embodiment.
FIG. 4 is a diagram for explaining the storage contents of the. In FIG. 4, PS
1 and PS2 are the ID numbers of the mobile stations 4 and 5, PS3 and PS
4, PS5, PS6, and PS7 are ID numbers of other mobile stations (not shown), t11, t12, and t13 are times when voice mails for mobile station 4 are stored, t21, and t21.
Reference numeral 22 denotes the time when the voice mail for the mobile station 5 is stored, V11, V12, and V13 indicate the voice mail for the mobile station 4, and V21 and V22 indicate the voice mail for the mobile station 5, respectively.

In the voice storage device 12, as shown in FIG. 4, the time when the voice mail is stored in association with the ID of the mobile station (telephone number, etc.), the ID of the source mobile station (telephone number, etc.) And voicemail are stored. Mobile station 4
(ID number PS1) includes, for example, I at time t11.
The voice mail V11 has arrived from the source mobile station holding the D number PS5. On the other hand, the voice mail V21 has arrived at the mobile station 5 from, for example, the source mobile station having the ID number PS3 at time t21.

Next, the operation after the cancellation of the line congestion will be described. FIG. 5 is a flowchart for explaining the operation correspondence between stations at the time of voice mail notification according to the first embodiment. In the first embodiment, the accumulated voice mail is notified when the line congestion state between the control station 1 and the base station that registers the called mobile station is resolved.

That is, after accumulating the voice mail, the control station 1 monitors a wired line that is currently closed and has no vacant channel (step S111), and continues monitoring until a vacant channel is created (step S112). . In the above example, since there is no free channel in the wired line LN2 between the control station 1 and the base station 3, the control station 1
2 is monitored until an empty channel is created.

Thereafter, when an empty channel appears (step S112), the control station 1 makes an incoming call from the base station 4 to the receiving side mobile station 5 through the wired line LN2. At this time, when the receiving mobile station 5 receives the incoming call, the voice mail for the receiving mobile station 4 is read from the voice storage device 12 and notified to the receiving mobile station 4 (step S1).
13). Thereby, the receiving side mobile station 4 receives the boss mail (step S200), and the mobile station 4 can listen to the voice mail.

As described above, according to the first embodiment, each of the mobile stations 4 and 5 transmits a voice mail if a voice mail request is received from the control station 1 after calling the control station 1. The station 1 is formed between the own station and the plurality of base stations 2 and 3 when an originating mobile station out of the plurality of mobile stations 4 and 5 transmits a call to the terminating mobile station. If there is line congestion in the communication path between the originating mobile station and the receiving mobile station, a voice mail is requested to the originating mobile station 4 or 5 to receive and store the voice mail. The voice mail is stored in the control station 1 even if the receiving side mobile station 5 or 4 cannot receive an incoming call, which eliminates the need for the calling side mobile station 4 or 5 to make a call again. Even voicemail on the system It is possible to realize a-bis.

Further, when the connection with the called mobile station cannot be established within a predetermined time, the result of the judgment that there is line congestion is obtained, so that when the line is congested, the calling mobile station 4 or 5 waits more than necessary. It is possible to smoothly transition to a voice mail service without any delay.

Further, the control station 1 monitors the presence or absence of a line vacancy and notifies the stored voice mail when it is confirmed that there is a line vacancy. No need to retrieve mail,
This makes it possible to improve the efficiency of the system.

Next, a modified example of the operation after the cancellation of the line congestion will be described. In the first embodiment described above, the control station 1 actively notifies the voice mail by eliminating the round-trip congestion state. However, as in a modified example described below, according to the request of the mobile stations 4 and 5, Voice mail may be passively notified. FIG. 6 is a diagram for explaining a sequence between stations when a voice mail notification request is made according to a modification of the first embodiment. FIG. 7 is a diagram showing an operation correspondence between stations when a voice mail notification request is made according to a modification of the first embodiment. It is a flowchart explaining.

According to the sequence shown in FIG. 6, each of the mobile stations 4 and 5 as the receiving side mobile stations issues a voice mail notification request to the base stations 2 and 3 in order to receive a voice mail notification. The station 1 notifies the mobile stations 4 and 5 of the corresponding voice mail in response to the voice mail notification request.

More specifically (see FIG. 7), the mobile stations 4 and 5 arbitrarily transmit a voice mail notification request signal to the control station 1 according to the operation of the user (step S211). For example, when the mobile station 4 transmits a voice mail notification request signal, the voice mail notification request signal is transmitted to the control station 1 via the base station 2. In the control station 1, the voice mail notification request signal is received by the control section 11 through the mobile station wired line interface section 14 and the circuit switch 13. When the control unit 11 recognizes that the request is a voice mail notification request from the mobile station 4 based on the input voice mail notification request signal, the control unit 11 searches the voice storage device 12 for the voice mail of the mobile station 4 ( Step S1
21).

As a result, when the voice mail is obtained (step S122), the voice mail is notified to the mobile station 4 (step S124), but when the voice mail is not obtained (step S124). Step S12
2) A notification that there is no voice mail is sent to the mobile station 4 (step S123). In this way, the mobile station 4 receives the voice mail notification or the notification of no voice mail, and ends the voice mail notification request operation (step S212).

As described above, according to this modification, the control station 1 notifies the accumulated voice mail when each of the mobile stations 4 and 5 requests the voice mail notification. The control station 1 only needs to accumulate the voice mail by appropriately extracting the voice mail according to the reception system of the called mobile station, and the load on the system can be distributed. The notification of the voice mail to the called mobile station is described in the first embodiment.
Can also be implemented.

(Embodiment 2) Although the above-described Embodiment 1 did not specifically describe the location registration of a mobile station, as in Embodiment 2 described below, each mobile station has The number of stored voicemails may be variable according to the rank. In the second embodiment, since the system configuration is the same as that of the first embodiment, the configuration of FIG. 1 is adopted. Therefore, only different configurations will be described below, and the same configurations as those in FIG. 1 will be described using the same reference numerals.

First, the main parts will be described. FIG. 8 is a diagram showing a location registration recording unit of the mobile radio communication system according to Embodiment 2 of the present invention. In FIG. 8, reference numeral 16 denotes a location registration recording unit according to the second embodiment, and BS1, BS2
Indicates the ID numbers of the base stations 2 and 3, respectively. In the second embodiment, since the number of stored voice mails is variable according to the rank of each mobile station, as shown in FIG. 8, it corresponds to the ID numbers PS1, PS2, PS3,. The rank, the number of registrable items, and the ID number of the registered base station are stored.

According to the position registration recording unit 16 shown in FIG. 8, the mobile station 4 (ID number PS1) has the rank "A".
(The rank levels are in ascending order of A, B...), The number of cases that can be registered is 20 corresponding to rank A, and the registered base station is base station 2 having ID number BS1. Also,
Mobile station 5 (ID number PS2) and other mobile stations (I
The D number PS3) has a rank of "B", the number of cases that can be registered is 10 corresponding to the rank B, and the registered base station is the base station 3 having the ID number BS2.

Next, the operation will be described. FIG. 9 is a diagram illustrating a sequence between stations when a location registration request is made according to the second embodiment. In the position registration according to the second embodiment, first, the base station 4 or 5 that desires position registration makes a position registration request to the control station 1 via the base station 3 or 2. When receiving the position registration request, the control station 1 notifies the originating mobile station that the position registration request has been received and the number of recordable voice mails. For example, when the mobile station 4 issues a location registration request, the control station 1 notifies the mobile station 4 of the number of voice mails that can be registered, and the mobile station 5 issues a location registration request. In this case, the control station 1 notifies the mobile station 5 of the number of voice mails that can be registered.

Further, the above-mentioned operation will be concretely described.
FIG. 10 is a flowchart for explaining the operation correspondence between stations when a position registration request is made according to the second embodiment. In this system, in order for the mobile stations 4 and 5 to communicate, registration in the location registration recording unit 15 is required. Here, a case where the mobile station 4 is registered in the base station 2 will be described as an example.

[0058] The mobile station 4 sends a location registration request signal to the base station 2. This position registration request signal is received by the wireless device 22 through the antenna 23 in the base station 2, transmitted to the wired line LN 1 via the wireless interface unit 211, the circuit switch 212, and the wired interface unit 213, and notified to the control station 1. (Step S221).

In the control station 1, the input position registration request signal is received by the control section 11 through the wire line interface section 14 and the circuit switch 13 (step S131). When the control unit 11 recognizes that the request is a position registration request of the mobile station 4 based on the input position registration request signal (step S132), the control unit 11 determines that the location of the mobile station 4 is the area of the base station 2. Register in the registration recording unit 15.

That is, at the time of this registration, the rank A is predetermined in the mobile station 4, and therefore, as shown in FIG. 20 are set as the number of cases (step S
133). Then, a notification that the location registration has been accepted and a notification of the number of voice mails that can be registered given to the mobile station 4 are transmitted to the mobile station 4 that has made the location registration request (step S134). Thereby, the mobile station 4 receives each notification (step S22).
2).

The mobile station 5 performs location registration in the same manner as the mobile station 4 described above. In this case, the control unit 11 registers in the position registration recording unit 15 that the location of the mobile station 5 is the area of the base station 3.

As described above, according to the second embodiment, the mobile station 4 or 5 transmits a location registration request for specifying the location among a plurality of base stations to the control station 1,
The control station 1 sets the number of voicemails that can be registered in the source mobile station according to a predetermined rank in accordance with the location registration request, and also sets the number of voicemails that can be registered for the source mobile station. Since the notification is made, the number of stored voice mails is limited according to the usage of each of the mobile stations 4 and 5, whereby the memory capacity of the control station 1 can be effectively used.

(Embodiment 3) In Embodiment 1 described above, communication between one-to-one mobile stations has been described.
As in Embodiment 3 described below, the voice mail service may be applied to broadcast communication. In the third embodiment, since the system configuration is the same as that of the first embodiment, the configuration of FIG. 1 is adopted. Therefore, only the different operation will be described below, and the same configuration as in FIG. 1 will be described using the same reference numeral.

FIG. 11 is a diagram showing an example of a communication status of the mobile radio communication system according to the third embodiment of the present invention.
In FIG. 11, reference numerals 5A, 5B, and 5C denote base stations registered in the base station 3, respectively. When the mobile station 4 performs broadcast transmission to all of the base stations 5A, 5B, and 5C, transmission is performed via the base station 2, the control station 1, and the base station 3. However, as shown in FIG. 11, when a free channel for transmitting to the mobile station 5A cannot be secured on the wired line LN2 between the control station 1 and the base station 3, transmission to the mobile station 5A is performed. However, only the transmission to the other mobile stations 5B and 5C is completed.

However, not only the one-to-one communication according to the first embodiment but also the voice mail can be stored for the mobile station 5A for which a free channel could not be secured for this broadcast communication. . The specific procedure will be described below. FIG. 12 is a diagram illustrating a sequence between stations when a broadcast transmission request is made according to the third embodiment. In the following description, the originating side is the mobile station 4 and the terminating side is the mobile stations 5A, 5B, 5C.

The originating mobile station 4 is the destination mobile station 5A, 5
When broadcasting to B and 5C, a transmitting request is first made from the transmitting side mobile station 4 to the base station 2.
Then, the control station 1 connecting the base station 2 transmits the broadcast transmission reception to the transmission side mobile station 4, and transmits the reception request to the reception side mobile stations 5A, 5B, 5C.

However, if there is a line congestion between the control station 1 and the base station 3 and a free channel cannot be secured only for the called mobile station 5A, the incoming call request to the called mobile station 5A cannot be made and the called mobile station 5A cannot be received within a certain time If a response to the incoming call request is not obtained from the receiving mobile station 5A, the current broadcast transmission to the receiving mobile station 5A becomes invalid due to a timeout.

In this case, the control station 1 inquires the originating mobile station 4 of a request to accept a voice mail, and in response to the inquiry, the originating mobile station 4 sends a voice mail to the control station 1. Can be Since this voice mail is stored in the control station 1, when the line congestion state between the control station 1 and the base station 3 is resolved, the voice mail can be heard at the receiving mobile station 5A thereafter.

As described above, according to the third embodiment, each of the mobile stations 4, 5A, 5B, and 5C controls the control station 1
If there is a voice mail request from the control station 1 after the broadcast transmission to the control station 1, the control station 1 transmits a voice mail, and the control station 1 transmits the voice mail from the transmitting mobile station among the mobile stations 4, 5A, 5B, 5C to the plurality of receiving side When a broadcast is transmitted to a mobile station, line congestion occurs in a communication path between the transmitting mobile station and the plurality of receiving mobile stations formed between the own station and the plurality of base stations 2 and 3. If so, voice mail is requested from the originating mobile station, and the voice mail is received and stored for the receiving side mobile station in a line congestion state. Even if there is a mobile station, voice mail is stored in the control station 1. This eliminates the need for the transmitting mobile station to make another call for the receiving mobile station that could not perform the broadcast. Even during line congestion during communication, It is possible to realize a voice mail service on the Temu.

In the third embodiment described above, a case has been described in which a free channel could not be secured for any of a plurality of mobile stations registered in one base station during broadcast communication. However, the same applies to a case where a mobile station that cannot receive a call due to a line congestion state occurs in any of a plurality of base stations.

Further, in the above-described first, second, and third embodiments, the line congestion state has been described as an example of the state in which communication with the called mobile station is impossible at the time of transmission, but the present invention is limited to this. However, the present invention can also be applied to a state in which the receiving side mobile station is not ready for reception (power off state, etc.). In this case, it is sufficient to store the voice mail because there is no response after transmitting the incoming call request.

[0072]

As described above, according to the present invention, each mobile station transmits a voice mail if the control station requests a voice mail after calling the control station, and the control station transmits a plurality of mobile mails. When a call is sent from a calling mobile station to a called mobile station, a communication path between the calling mobile station and the called mobile station formed between the own station and a plurality of base stations. If there is line congestion, voice mail is requested from the originating mobile station, and the voice mail is received and stored. Since the mail is accumulated and the calling mobile station does not need to make a new call, a mobile radio communication system capable of realizing a voice mail service on the system even in a line congestion state is obtained. When Achieve the cormorant effect.

According to the next invention, each mobile station transmits a voice mail if there is a voice mail request from the control station after the broadcast transmission to the control station, and the control station transmits the voice message among a plurality of mobile stations. Communication between a calling mobile station and a plurality of called mobile stations formed between the local station and a plurality of base stations when a broadcast is sent from the called mobile station to a plurality of called mobile stations. If there is line congestion on the route, a voice mail is requested to the originating mobile station, and the voice mail is received and stored for the receiving side mobile station in the line congestion state. Even if there is a called mobile station that cannot receive a call, voice mail is stored in the control station, which eliminates the need for the calling mobile station to make another call for the called mobile station that could not broadcast. From the line when broadcasting Even 輳 state is an effect that the mobile radio communication system capable of realizing a voice mail service on the system can be obtained.

According to the next invention, when the connection with the called mobile station cannot be established within a predetermined time, the result of the judgment that there is line congestion is obtained. There is an effect that a mobile radio communication system capable of smoothly shifting to a voice mail service without waiting is obtained.

According to the next invention, the control station monitors the presence / absence of a line vacancy and notifies the stored voice mail when it is confirmed that there is a line vacancy.
There is no need for the receiving-side mobile station to take out the voice mail by itself, thereby providing a mobile radio communication system capable of improving the efficiency of the system.

According to the next invention, the control station notifies the stored voice mail when there is a voice mail notification request from each mobile station. The control station only needs to accumulate the voice mail by appropriately taking out the voice mail in this manner, and it is possible to obtain a mobile radio communication system capable of distributing the load on the system.

According to the next invention, a position registration request for specifying a location in a plurality of base stations is transmitted from the mobile station to the control station, and the control station transmits to the transmission source mobile station in accordance with the position registration request. The number of voicemails that can be registered according to a predetermined rank is set, and the number of voicemails that can be registered is notified to the source mobile station. Accordingly, the number of stored voice mails is limited, thereby providing a mobile radio communication system capable of effectively utilizing the memory capacity of the control station.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a mobile radio communication system according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a sequence between stations at the time of a transmission request according to the first embodiment.

FIG. 3 is a flowchart illustrating an operation correspondence between stations when a call is requested according to the first embodiment.

FIG. 4 is a diagram for explaining contents stored in a voice storage device according to the first embodiment;

FIG. 5 is a flowchart illustrating an operation correspondence between stations when notifying a voice mail according to the first embodiment;

FIG. 6 is a diagram illustrating a sequence between stations when a voice mail notification request is made according to a modification of the first embodiment.

FIG. 7 is a flowchart illustrating an operation correspondence between stations when a voice mail notification request is made according to a modification of the first embodiment.

FIG. 8 is a diagram showing a main part of a mobile radio communication system according to a second embodiment of the present invention.

FIG. 9 is a diagram illustrating a sequence between stations when a location registration request is made according to the second embodiment.

FIG. 10 is a flowchart illustrating an operation correspondence between stations when a location registration request is made according to the second embodiment.

FIG. 11 is a diagram showing an example of a communication state of a mobile radio communication system according to a third embodiment of the present invention.

FIG. 12 is a diagram illustrating a sequence between stations when a broadcast transmission request is made according to the third embodiment.

FIG. 13 is a block diagram showing a mobile radio communication system according to a conventional example.

[Description of Signs] 1 control station, 2, 3 base station, 4, 5, 5A, 5B, 5
C mobile station, 11 control unit, 12 voice storage device, 16
Location registration storage unit.

Claims (6)

[Claims] 1. A plurality of mobile stations, a plurality of base stations that communicate with each of the mobile stations via a wireless line, and a plurality of base stations that are connected to each of the base stations by a wired line and that are connected to each of the plurality of mobile stations through the respective base stations In a mobile radio communication system comprising a control station for controlling communication between mobile stations, each mobile station comprises: a transmitting means for transmitting to the control station; and a voice mail from the control station after transmitting by the transmitting means. And a voice mail transmitting means for transmitting voice mail to the control station when the request is issued, wherein the control station is configured to transmit a voice mail from a calling mobile station to a called mobile station among the plurality of mobile stations. When there is a call from the transmitting means, the presence or absence of line congestion in a communication path between the transmitting side mobile station and the receiving side mobile station formed between the control station and the plurality of base stations. Determining means for determining Storage means for requesting the originating mobile station for voice mail when the judgment result indicates that there is line congestion by the judgment means, and accumulating the voice mail sent by the voice mail transmission means. A mobile radio communication system, comprising: 2. A plurality of mobile stations, a plurality of base stations for communicating with each of the mobile stations via a wireless line, and a plurality of base stations connected to each of the base stations by a wire line, and the plurality of the base stations through the respective base stations. In a mobile radio communication system including a control station that controls communication between mobile stations, each of the mobile stations includes: a broadcast transmission unit that broadcasts to the control station; and a broadcast by the broadcast transmission unit. Voice mail transmitting means for transmitting a voice mail to the control station when a voice mail request is issued from the control station after the transmission, and wherein the control station transmits the voice message among the plurality of mobile stations. When there is a broadcast transmission by the broadcast transmission means from the mobile station to a plurality of receiving mobile stations, the transmitting mobile station formed between the control station and the plurality of base stations. The communication path between the plurality of called mobile stations. Judgment means for judging the presence or absence of line congestion, requesting a voice mail to the originating mobile station when a judgment result of the presence of line congestion is obtained by the judgment means for each called mobile station, Storing means for storing the voice mail transmitted by the mail transmitting means for a receiving-side mobile station having line congestion; 3. The mobile radio according to claim 1, wherein said determination means obtains a determination result that there is line congestion when connection with the called mobile station cannot be established within a predetermined time. Communications system. 4. The control station further includes a monitoring unit that monitors the presence or absence of a line vacancy, and notifies the voice mail stored in the storage unit when a line vacancy is confirmed by monitoring of the monitoring unit. The mobile radio communication system according to any one of claims 1 to 3, further comprising a voice mail notification unit. 5. The control station further comprises a voice mail notifying unit for notifying the voice mail stored in the storage unit when a voice mail notification request is received from each of the mobile stations. The mobile radio communication system according to any one of claims 1 to 4. 6. Each of the mobile stations further includes a registration request transmitting unit for transmitting a position registration request for specifying a location in the plurality of base stations to the control station, Further, setting means for setting the number of voicemails that can be registered according to a predetermined rank in the transmission source mobile station of the registration request transmitting means according to the position registration request sent by the registration request transmitting means, The mobile station according to any one of claims 1 to 5, further comprising: a number notification unit that notifies the source mobile station of the number of voice mails that can be registered, set by the setting unit. Wireless communication system.