JPH07336761A - Mobile communication system - Google Patents

Abstract

(57) [Summary] [Purpose] When an incoming call is made to a mobile station that cannot answer the incoming call, the user can recognize the occurrence of the incoming call after the mobile station returns to the incoming ready state. To do. [Configuration] When an incoming call is made from a fixed telephone TEL1 to a mobile station MS11 that is out of service area and is in a state in which an incoming call cannot be received, the mobile communication control device 40 associates the mobile station MS11 with the mobile station MS11 in a mobile station location information table. The calling terminal number of the fixed telephone TEL1 is stored. When the mobile station MS11 returns to the communicable state after returning to the service area, a "call setting" message including the caller terminal number is sent to the mobile station MS11, and the caller terminal number is sent to the mobile station MS11. The display is made on the LCD of the MS 11.

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 such as an automobile / mobile phone system or a cordless phone system, and more particularly to a system having an improved incoming call notification function for a mobile station.

[0002]

2. Description of the Related Art In recent years, mobile communication systems such as automobiles and mobile phone systems have become ready for easy use due to the progress of network maintenance and the downsizing and cost reduction of mobile phones. The signs are starting to appear. The use of a mobile communication system is very convenient because it allows not only to make a call from a user's terminal anytime and anywhere, but also to receive an incoming call at any place such as whereabouts.

In constructing a mobile communication system, transmitting a strong radio wave from a base station antenna over a wide area is not a good idea from the viewpoint of effective use of the radio wave. Therefore, the service area is generally called a cell, for example, a diameter of several k.
A cellular station that performs communication by dividing into small zones of about m, arranging base stations in these wireless zones, and transmitting radio waves of several hundred mW to several W between these base stations and mobile stations. The method is adopted. The greatest advantage of this cellular system is that a common radio frequency can be repeatedly used in a plurality of non-adjacent radio zones, which makes it possible to accommodate more mobile stations than the large zone system.

On the other hand, in order to realize such a cellular system, when a mobile station moves from one wireless zone to another wireless zone, it is necessary to have a function of tracking the incoming call to receive an incoming call. Location registration procedures are specified. In this location registration procedure, the network controller of the mobile network registers and manages the location of each mobile station for each wireless zone. For example, the mobile station receives notification information that is periodically transmitted from each base station. However, when the area code included in the received broadcast information is different from the area code up to that point, the mobile station transmits a location registration request including the mobile station number to the base station and transmits the location information to the network controller of the mobile network. The position information of this mobile station is registered. By using this location registration information, the mobile network can specify the wireless zone in which each mobile station exists and can notify the incoming call.

[0005]

However, the conventional mobile communication system of this kind has the following problems to be solved. That is, if the mobile station is out of the service area of the system or if the power of the mobile station is not turned on, the position of the mobile station may not be properly managed in the mobile communication network. In this case, when an incoming call is made to the mobile station, the mobile communication network notifies the mobile station of the incoming call based on the old location registration information. If the mobile station does not return the incoming call response within a predetermined time, the incoming call is received. It judges that it is impossible and releases the incoming call.

For this reason, the user of the source terminal has no way of knowing when the mobile station of the other party returns to the state in which communication is possible, and therefore the user of the source terminal has to spend a lot of time again to repeat the call. I was forced to do so and the operation was very troublesome. In addition, for the user of the destination mobile station, when the mobile station is in the outside of the service area or the power is off, it returns to the state where the mobile station can communicate. Since it is not possible to know even after doing so, it was extremely unfavorable because there was a problem that the response to the emergency contact could not be made at all or was delayed.

Further, as described above, when the source terminal repeatedly makes a call again to the mobile station which does not respond to the incoming call,
In the mobile communication network, wasteful incoming call processing that does not result in a call is repeated each time, which is not preferable in terms of network processing efficiency. Further, since the wireless channel is monopolized each time due to the above-mentioned useless incoming call, it is not preferable in terms of utilization efficiency of the wireless channel.

Therefore, a first object of the present invention is that, when an incoming call is made to a mobile station that cannot respond to incoming calls, the occurrence of this incoming call is returned to the user after the mobile station returns to the incoming ready state. It is to provide a mobile communication system capable of recognizing an incoming call and thereby appropriately responding to an incoming call.

A second object of the present invention is that, when the destination mobile station does not respond to the incoming call, after the mobile station of the destination is returned to the state in which the incoming call is possible, the fact that the terminal of the source is informing It enables the user to recognize, thereby preventing useless calling operation, improving the operability of the user,
An object of the present invention is to provide a mobile communication system capable of reducing the processing load of exchange control and improving the utilization rate of radio channels.

[0010]

In order to achieve the above-mentioned first object, the first invention is such that, when an incoming call notification is sent to a mobile station, the mobile station of the incoming call destination is notified by the first state judging means. It is determined whether or not communication is possible, and when it is determined that the destination mobile station cannot communicate, the identification information of the destination mobile station is stored in the storage means. Then, in this state, it is judged by the second state judging means whether or not the destination mobile station is restored to the communicable state, and it is determined that the destination mobile station is restored to the communicable state. In case,
Based on the identification number stored in the storage means, the mobile station of the destination is notified of the information that the call originated.

According to a first aspect of the invention, the determination by the first state determining means and the second state determining means is performed by searching the mobile station location registration information for managing the location of the mobile station with respect to the wireless zone. Is characterized by.

Further, a first invention is based on the above first and second inventions.
In addition to the state determination means, the storage means, and the notification control means, the response monitoring means and the connection control means are provided. Then, after notifying the information that the call originated, a predetermined response is monitored from the mobile station of the called party, and when it is detected that the mobile station of the called party has made a predetermined response,
It is characterized in that the connection control means performs a process for connecting between the destination mobile station and the source terminal.

On the other hand, in order to achieve the above-mentioned second object, the second invention is the first invention when the incoming notification is given to the mobile station.
The status determining means determines whether the destination mobile station is in a communicable state, and when the destination mobile station is determined to be incommunicable, the destination mobile station is identified. The information and the identification information of the source terminal are stored in the storage means in association with each other. Then, in this state, it is judged by the second state judging means whether or not the destination mobile station is restored to the communicable state, and it is determined that the destination mobile station is restored to the communicable state. In this case, based on the identification number of the source terminal stored in the storage means, the source terminal is notified of the information that the destination mobile station has recovered to the communicable state. It is a thing.

A second aspect of the present invention, when it is determined that the destination mobile station cannot communicate, sends a notification from the source terminal that the destination mobile station has recovered to the communicable state. If the information indicating whether or not the notification is desired is stored in the storage means and the information indicating that the notification is not desired is stored in the storage means, the mobile station of the callee is restored to the communicable state. However, it is characterized in that the source terminal is not notified that the destination mobile station has recovered to the communicable state.

Further, in the second invention, when the storage period of the identification information exceeds a preset period before the destination mobile station storing the identification information is restored to the communicable state, It is characterized by erasing the memory of the identification information.

Further, a second invention is the above-mentioned first and second inventions.
In addition to the state determination means, the storage means, and the notification control means, the response monitoring means and the connection control means are provided. Then, after notifying the source terminal of the information that the destination mobile station has recovered to the communicable state, a predetermined response from the source terminal is monitored by the response monitoring means, and the source When it is detected that this terminal has made a predetermined response, the connection control means performs a process for connecting the source terminal and the destination mobile station. Is characterized by.

[0017]

As a result, according to the first aspect of the invention, when the incoming call destination is not answered because the incoming call destination mobile station is out of the service area or is not powered on, the identification information of the incoming call destination mobile station is obtained. Is memorized. Then, when the destination mobile station returns to a state in which it is possible to respond to an incoming call by returning to the service area or turning on the power, for example, the incoming destination mobile station receives an incoming call unresponsive period during the incoming call non-response period. You will be notified that an incoming call has occurred. Therefore, the user of the destination mobile station can know from this notification that an incoming call has occurred during the incoming call unanswered period, and in response to this, for example, immediately notify the user of the originating terminal. It is possible to take appropriate measures such as taking

In the first aspect of the invention, the position of the mobile station is managed by determining whether the destination mobile station is ready for incoming call response and returning to the incoming call ready state. This is done by searching the mobile station location registration information. That is, it is determined whether or not the mobile station is in the incoming call unresponsive state by using the existing location registration information managed for the incoming call processing. Therefore, it is not necessary to newly perform a process of determining whether or not the incoming call is unanswered by transmitting a notification signal to the mobile station each time and confirming the response, which enables the network control device of the mobile communication network to operate. The processing load can be reduced.

Further, in the first aspect of the present invention, a predetermined response comes from this mobile station after notifying the incoming call destination mobile station that has recovered to the communicable state that an incoming call has occurred during the incoming call non-response period. Then, the mobile station and the source terminal are automatically connected by the mobile switching network. Therefore, the user of the destination mobile station does not need to separately make a call operation to the caller terminal after receiving the notification, which improves the operability and is very convenient.

On the other hand, according to the second aspect of the present invention, when the incoming call destination is not answered because the incoming call destination mobile station is out of the service area or is not powered on, the identification information of the incoming call destination mobile station is displayed. It is stored together with the identification information of the source terminal. When the destination mobile station returns to a state where it can respond to an incoming call by returning to the service area or turning on the power, for example, the destination mobile station communicates with the source terminal. You will be notified that you have recovered to a possible state.

Therefore, when the incoming call destination mobile station does not respond to the incoming call, the user of the originating terminal need only wait for the above notification. For this reason, it is not necessary to repeatedly make a call from the source terminal, which greatly reduces the labor of the user and improves the operability. Further, since the repeated call origination is not performed, useless incoming call processing that does not result in a call is not performed in the mobile communication network, thereby reducing the traffic of the mobile communication network. Further, since the wireless channel is not exclusively occupied by the above-mentioned useless incoming call, it is possible to improve the effective utilization rate of the wireless channel.

According to the second aspect of the invention, when the information indicating that the user does not want to be notified is sent from the terminal of the caller, even if the mobile station of the callee is restored to the communicable state, the caller of the caller is called. No information to that effect is sent to the terminal. For this reason, when the originator terminal is not so important, the user of the originator terminal sends information indicating that he / she does not wish to be notified to the switching network and registers the information so that the destination mobile station can communicate. You don't have to be notified every time you recover to a possible state.

Further, according to the second aspect of the present invention, if the storage period of the identification information exceeds a preset period before the destination mobile station in which the identification information is stored is restored to the communicable state, , The storage of the identification information is erased. Therefore, the problem that the stored information of the old incoming call remains forever is solved.

Further, in the second invention, when a predetermined response arrives from the source terminal after notifying the source terminal of the information that the destination mobile station has recovered to the communicable state, the transmission is terminated. The original terminal and the destination mobile station are automatically connected by the mobile communication network. Therefore, the user of the source terminal does not need to perform a separate call operation to this mobile station after receiving the information that the destination mobile station has recovered to the communicable state. Be improved.

[0025]

【Example】

(First Embodiment) FIG. 1 is a schematic configuration diagram of a mobile communication system according to the first embodiment. This system
The mobile communication service is also provided by utilizing the connection switching function of the fixed communication network based on the integrated service digital network (ISDN).

In the ISDN network NW, a switch 10 is at the core, and the switch 10 has a plurality of line interface circuits 11 to 1n for fixed terminals, a plurality of line interface circuits 21 to 2m for mobile terminals, and mobile terminals. A line interface circuit 30 for the communication control device is connected to each. Of these, fixed line telephones TEL1 to TELn are connected to the respective line interface circuits 11 to 1n for fixed terminals via wired lines. In the line interface circuits 11 to 1n, fixed telephones TEL1 to TE
Various interface operations are carried out with respect to Ln to make and receive calls and to send and receive information.

Each of the above line interface circuits 11 to 1
As the communication interface method of n, 21 to 2m, 30 an ISDN basic interface is applied, for example.
The ISDN basic interface performs ping-pong transmission using a two-wire metallic cable in accordance with the provisions of the TTC (Telecom Telephone and Telephone Technical Committee) standard JT-G961, and its transmission line format is both upstream and downstream.
Two information channels B with a transmission capacity of 64 kbps
1, B2 and a signal channel D having a transmission capacity of 16 kbps are multiplexed (2B + D).

Of these, the D channel is used for communication by executing the call control signal procedure defined by the TTC standards JT-Q921 and JT-Q931 between the exchange 10 and the terminal when the terminal makes or receives a call. Information channels B1 and B
Used to assign 2. Between the terminals that have shifted to the information communication by this call control procedure, arbitrary information between terminals such as voice and data is transferred on the information channels B1 and B2 allocated by the exchange 10.

FIG. 3 shows a sequence of standard call control signaling procedures performed on the D channel. In the figure, it is assumed that an operation for making a call to the fixed terminal TEL1 is performed at the fixed terminal TEL2. Then, from the calling terminal TEL2 to the exchange 1
A "call setup" message is sent to 0. As shown in FIG. 4, this "call setting" message includes various information elements necessary for transmission such as transmission capability, called number and calling number. When receiving this "call setup" message, the exchange 1
0 returns a "call setting acceptance" message in which the B channel used for information communication is inserted to the calling terminal TEL2,
In addition, the incoming call connection process to the line corresponding to the called number included in the "call setting" message is started.

That is, first, the exchange 10 sends a "call setting" message to the receiving terminal TEL1 of the line selected corresponding to the called number. The receiving terminal TEL1 that has received this "call setting" message determines whether or not its transmission capability matches its own communication function. Then, for example, when it is found that both the calling terminal and the called terminal have a voice communication function, a "call setting acceptance" message and a "call" indicating that an incoming call is accepted when the communication functions match.
The message is returned to the exchange 10. At this time, the incoming call terminal TEL1 generates a ringing sound to notify the user of the occurrence of the incoming call.

When the "call setting acceptance" message and the "call" message are returned from the receiving terminal TEL1,
The exchange 10 sends a "call" signal to the calling terminal TEL2. Then, in this state, the receiving terminal TEL1 goes off-hook and responds to the incoming call, and when a "response" message is transmitted from the receiving terminal TEL1 by this, this "response" message is transferred to the originating terminal TEL2 via the exchange 10. . Thus, a communication link by the information channel B is formed between the transmitting terminal TEL2 and the receiving terminal TEL1,
After that, the voice data can be transmitted through the communication link between TEL2 and TEL1 between both terminals.

When communication is completed and the calling terminal TEL2 sends a "disconnect" signal, the exchange 10 sends the calling terminal TEL.
2, a "release" signal is sent, and in response to this "release" signal, the transmitting terminal TEL2 releases the information channel B in use and returns a "release complete" signal to the exchange 10 to return to the standby state. To do. On the other hand, when the receiving terminal TEL1 receives the "disconnect" message from the exchange 10, the information channel B in use is released and the "release" message is returned to the exchange 10, and thereafter the "release complete" message is sent from the exchange 10. When you receive the, you will return to the standby state.

On the other hand, the part related to the mobile communication service is constructed as follows. That is, a plurality of line interface circuits 21 to 2 for mobile terminals connected to the exchange 10.
Base stations BS1 to BSm are connected to m.
These base stations BS1 to BSm are arranged at appropriate intervals in an area that provides mobile communication services, and each forms a unique radio zone Z1 to Zm. For example, RC, a standard for "digital car telephone system" established by the Radio System Development Center (RCR)
When complying with RSTD-27, that is, when the radio channel interval is set to 50 KHz in the radio frequency band of 800 MHz and communication is performed with the mobile station by the TDMA (Time Division Multipriex) method, the transmission output of the mobile station Is set to 30 mW to 3.0 W, so that the size of one wireless zone Z1 to Zm is formed so as to cover a few Km squares in terms of the through distance. Each mobile station MS can communicate by being in any one of the above-mentioned wireless zones Z1 to Zm.

Further, the base stations BS1 to BSm and the mobile stations MS11 located in the radio zones Z1 to Zm thereof.
~ MS14, MS21 to MS24, MS31 to MS34
A TDMA method is used as a radio access method between the base station BS and the mobile station MS, and a broadcast channel (BCCH), a common control channel (CCCH), and an information channel (TCH) are multiplexed between the base station BS and the mobile station MS. It is converted and transmitted.

The broadcast channel is transmitted by the base station BS to the mobile station MS.
It is used to notify the area information and the like. That is, a unique area number is assigned in advance to each of the base stations BS1 to BSm, and each of the base stations BS1 to BSm is assigned.
m is, for example, as shown in FIG. 5, its own wireless zone Z1 to Z
A broadcast information message including an area number information element of m is created, and this broadcast information message is periodically transmitted to each mobile station MS using a broadcast channel. The common control channel is used to transfer call control information related to originating and terminating calls. Information channels are used to transfer mobile station information such as voice and data.

By the way, in the system of this embodiment, a fixed network switch is used as the switch 10, so that a mobile communication control device 40 is separately provided for executing the mobile communication service. FIG. 2 is a circuit block diagram showing the schematic configuration thereof.

The mobile communication control device 40 is a microcomputer (CPU) 41 which controls the system of the entire device.
Is provided as a core, and the CPU 41 is provided with a ROM 42 and a mobile station position information table 43 via a system bus.
, The ISDN interface circuit 44, and the maintenance terminal interface circuit 45 are connected to each other.

The ROM 42 stores a program executed by the CPU 41 and control data necessary for the execution. The ISDN interface circuit 44 has an interface function for connecting the mobile communication control device 40 and the ISDN exchange 10 via a wired line. The maintenance terminal interface circuit 45 is connected to a maintenance terminal 50 including, for example, a personal computer. The maintenance terminal 50 is used to register the subscriber number of each mobile station that has subscribed to the mobile communication service and to monitor the operating status of the system via the mobile communication control device 40. The mobile station location information table 43 stores location information indicating in which radio zone Z1 to Zm each mobile station MS that has subscribed to the mobile communication service is located.

The CPU 41 has, as its basic control functions, a function of controlling outgoing / incoming calls of each mobile station MS via the exchange 10 and a subscriber number of the mobile station input from the maintenance terminal 50 as mobile station position information. The function of registering and managing in the table 43 and each of the base stations BS1 to BS1 connected through the exchange 10.
It has a function of controlling the location registration procedure of the mobile station with the BSm and updating the location information stored in the mobile station location information table 43 accordingly.

FIG. 7 is a sequence diagram showing an example of the location registration procedure. Each mobile station MS receives the "notification information" message (for example, FIG. 5) periodically transmitted from the base station BS by the notification channel BCCH in the standby state after the power is turned on, and receives this "notification information" message. Each time it is received, the area number inserted in this message is compared with the previously received area number. If both area numbers are different, it is determined that the own station has moved to a new wireless zone, and a "location registration request" message including the terminal number element of the own station is created as shown in FIG. 6, for example. Then, this message is transmitted to the base station BS of the new zone via the common control channel CCCH.

When this "location registration request" message is received by the base station BS, it is transferred to the exchange 10 after being transferred to the D channel. Upon receiving the signaling message related to the location registration procedure, the exchange 10 sends the signaling message to the line interface circuit 30 using the D channel.
To the mobile communication control device 40 via the.

When the "location registration request" message arrives, the mobile communication control unit 40 stores the subscriber number (mobile station number) of the mobile station included in this message in the corresponding area of the mobile station location information table 43. . Then, a "location registration acceptance" message is generated, and this message is transferred to the corresponding base station BS using the D channel. Base station BS that has received this "location registration acceptance" message
Notifies the mobile station MS of the registration request source of this “location registration acceptance” message via the common control channel CCCH.

Similarly, the wireless zone Z1 in the system will be described below.
The position information of all the mobile stations MS existing within the range of Zm to Zm is stored in the mobile station position information table 43 in the mobile communication control device 40. Also, after registration of this position information, the mobile station MS
When the mobile station moves to another wireless zone, the above-mentioned location registration procedure is carried out at the time when the “broadcast information” message arrives from the base station BS, whereby the location of the corresponding mobile station in the mobile station location information table 43. Information is updated. Figure 8
Shows an example of the configuration of the mobile station position information table 43 in which the position information of each mobile station MS is registered in this way.

By the way, the mobile communication control device 4 of the present embodiment
In addition to the usual control means associated with the origination / termination of the mobile station MS, the location registration control means, etc., 0 is newly equipped with control means for executing the incoming call notification service during out-of-service.

This out-of-range incoming call notification control means is a mobile station MS.
When an incoming call is made to the mobile station M
It is determined whether or not S is ready for incoming call response based on the location registration content of the mobile station location information table 43. If location registration has not been performed, it is determined that incoming call response is not possible, and the destination is moved. The calling terminal number is stored in association with the subscriber number of the station MS. Then, in this state, the destination mobile station M
When S returns to the state in which it can respond to the incoming call, it is controlled to notify the mobile station MS of the incoming call destination of the calling terminal number.

Next, various incoming operation sequences for the mobile station MS of the system configured as above will be described. (1) When a mobile station receives an outgoing call from a fixed telephone (see FIG. 9) For example, the mobile station MS1 currently located in the wireless zone Z1
It is assumed that 1 turns on the power at time t1. In this state, when the "broadcast information" message arrives from the base station BS1 via the broadcast channel BCCH, the mobile station MS11 executes the location registration procedure according to the "broadcast information" message. The sequence of the location registration procedure is as shown in FIG. 7, whereby the mobile station MS11 is located in the wireless zone Z1 of area number 001 in the mobile station location information table 43 of the mobile communication control device 40. The effect is stored. When this position registration procedure ends, the mobile station MS11 shifts to the standby state.

Now, at the time t2, the fixed telephone TE
It is assumed that an outgoing call is made to the mobile station MS11 at L1, and thereby a "call setup" message of call number # 1 requesting the outgoing call is sent from the fixed telephone TEL1 to the exchange 10. Then, the exchange 10 returns a "call setting acceptance" message to the fixed telephone TEL1. At the same time, the exchange 10 determines whether the called number included in the “call setup” message is addressed to a fixed telephone or a mobile station. Since it is addressed to the mobile station now, the call is called. The message is replaced with the “call setup” message of call number # 2 and notified to the mobile communication control device 40.

Upon receipt of this notification, the mobile communication control unit 40 sends a "call setting acceptance" message of call number # 2 to the exchange 1
After returning to 0, the mobile station location information table 43 is searched based on the called number included in the above “call setup” message,
The zone in which the mobile station MS11 corresponds to the called number is searched for. When the zone Z1 in which the mobile station MS11 is located is determined, the base station BS1 corresponding to this zone Z1 is sent to the exchange 10 a "call setting" message for requesting transmission of the call number # 3. This "call setup" message is transferred from the exchange 10 to the base station BS1. When the base station BS1 receives the "call setup" message,
This "call setup" message is transmitted to each mobile station in the wireless zone Z1.

The mobile station MS11 monitors the arrival of the "call setup" message addressed to itself from the base station BS1 in the standby state, and in this state the "call setup" message addressed to itself is received. Then, the "call setting acceptance" message of the call number # 3 is returned to the mobile communication control device 40 via the base station BS1 and the exchange 10. Then, thereafter, the "call" message and the "response" message are appropriately exchanged between the mobile station MS11, the exchange 10, the mobile communication control device 40, and the originating fixed-line telephone TEL1, and when the exchange of these messages is completed. A call link is formed between the fixed-line telephone TEL1 of the caller and the mobile station MS11 of the callee, and the call can be made thereafter.

That is, the fixed telephone TEL1 and the mobile station M
By the time the call link is formed with S11, the link between the fixed telephone TEL1 with the call number # 1 and the exchange 10 and the link between the exchange 10 and the mobile communication device 40 with the call number # 2. And the link between the mobile communication device 40 with the call number # 3 and the base station BS1 will be three call control links. With these three call control links, the exchange 10 merely performs call control for outgoing and incoming calls between the three fixed network terminals, and the control relating to the mobile communication service is performed by the mobile communication control device 40 and the base station BS. Performed by.

(2) When an incoming call from a fixed telephone occurs to a mobile station in the out-of-range state (see FIG. 10) In the standby state, the mobile station MS11 receives the radio zone of the base station BS1 of the location registration destination at time t2. It is assumed that the user has moved from Z1 to the outside of the service area of the system. Then, in this state, at time t3, the mobile station MS moves from the calling terminal TEL1.
It is assumed that a “call setup” message addressed to 11 is sent.

In this case, the exchange 10 and the mobile communication control device 40 follow the same sequence as the incoming sequence described with reference to FIG. 9 in the wireless zone Z1 in which the incoming mobile station MS11 is registered in the mobile zone position information. Table 4
3 from the base station B corresponding to this wireless zone Z1
A "call setup" message is sent to the destination mobile station MS11 via S1.

However, since the mobile station MS11 does not exist in the radio zone Z1 now, the "call setting acceptance" message is not returned from the mobile station MS11. The exchange 10
If it is not possible to confirm the return of the "call setting acceptance" message within a predetermined time after sending the "call setting" message, the "call setting acceptance" message is sent again. If the "call setting acceptance" message is not returned even when the "call setting acceptance" message is retransmitted, the exchange 10 displays the call number # 3 in which the reason display = no response, as shown in FIG.
The “release completion” message of No. is transferred to the mobile communication control device 40. Upon receiving this "release complete" message, the mobile communication control device 40 rewrites the reason display = no response to the reason display = out of the service area, and the rewritten message is called number #.
It is returned to the exchange 10 as a "release complete" message No. 2. When receiving this "release completed" message, the exchange 1
0 creates a "release complete" message for call number # 1 and sends it to the calling terminal TEL1.

When receiving the "release complete" message, the mobile communication control device 40 determines that the mobile station MS11 of the called party.
Is determined to have moved out of the service area, and the calling terminal TEL1 is entered in the out-of-service incoming call calling terminal number column of the mobile station location information table 43.
Memorize the subscriber number of. And thereafter, the mobile station MS
When a "call setup" message addressed to 11 arrives,
Instead of sending the "call setting" message to the mobile station MS11, the "release completion" message is returned to the calling terminal TEL1 as it is through the exchange 10.

(3) When the mobile station outside the service area returns to the service area (see FIG. 11) By the way, at the time t1, the mobile station MS11 outside the service area of the system, for example, the radio zone of the base station BS1 Suppose that you have returned to Zm. Then, first, the location registration procedure is executed between the mobile station MS11 and the mobile communication control device 40 via the base station BSm and the exchange 10 in the new radio zone Zm.

That is, the mobile station MS11 is connected to the base station BS.
When the "broadcast information" message periodically transmitted by the broadcast channel BCCH is received from m, the area number inserted in this message is compared with the previously received area number. And if both area numbers are different,
When it is determined that the mobile station has moved to a new wireless zone, a “location registration request” message including the terminal number element of the mobile station is created as shown in FIG. 6, and this message is set on the common control channel CCCH. Via the new zone base station BS
send to m.

When this "location registration request" message is received by the base station BSm, it is transferred to the exchange 10 after being transferred to the D channel. Upon receiving the signaling message related to the location registration procedure, the exchange 10 sends the signaling message to the line interface circuit 3 using the D channel.
0 to the mobile communication control device 40.

When the "location registration request" message arrives, the mobile communication control unit 40 stores the subscriber number (mobile station number) of the mobile station MS11 included in this message in the corresponding area of the mobile station location information table 43. To do. Then, a "location registration acceptance" message is generated, and this message is transferred to the corresponding base station BSm using the D channel. The base station BSm receiving this "location registration acceptance" message receives this "location registration acceptance" message,
It notifies the mobile station MS11 of the registration request source via the common control channel CCCH. Thus, the registration position of the mobile station MS11 in the mobile station position information table 43 is updated.

Now, when the update of the registration position of the mobile station MS11 is completed, the mobile communication control device 40 searches the mobile station position information table 43, and thereby the mobile station M concerned.
It is determined whether or not an incoming call is generated while S11 is out of the service area. And here, the mobile station position information table 43
In the out-of-range incoming / outgoing calling terminal number field, the subscriber number of the calling terminal TEL1 is stored in association with the mobile station MS11. Therefore, a "call setting" message including this calling terminal number is created, and this " Switch 10 message
To the base station BSm. The calling terminal number is inserted in the user / user information area, for example. Base station B
Sm sends this "call setup" message to the mobile stations in the wireless zone Zm.

When the mobile station MS11 receives the "call setting" message addressed to itself, the calling terminal number included in the "call setting" message is displayed on, for example, a liquid crystal display (LCD). . Therefore, the mobile station MS11
By looking at the calling terminal number displayed on the LCD, the user can recognize that an incoming call has been made from the calling terminal TEL1 while the user is moving out of the service area.

It should be noted that the calling terminal number, together with a guidance message indicating that an incoming call has occurred during the out-of-range period,
You may comprise so that a voice output may be carried out from a receiver using a voice synthesis technique etc.

When the user of the mobile station MS11 performs a predetermined operation, for example, an off-hook operation while receiving the notification of the calling terminal number, the mobile station MS11 sends the base station B to the base station B.
A "call setup acceptance" message is sent to Sm, and this message is transferred from the base station BSm to the mobile communication control device 40 via the exchange 10. When this "call setup acceptance" message arrives, mobile communication control device 40 originates an incoming call to originating terminal TEL1 and transmits the "call setup" message to exchange 10. The "call setup" message is transferred from the exchange 10 to the base station BSm, and further transmitted from the base station BSm to each mobile station in the wireless zone Zm.

When the "call setup" message addressed to itself is received, the mobile station MS11 returns a "call setup acceptance" message to the mobile communication control unit 40 via the base station BSm and the exchange 10. Then, thereafter, the "call" message and the "response" message are appropriately exchanged with the mobile station MS11, the exchange 10, the mobile communication control device 40, and the originating fixed telephone TEL1, and the exchange of these messages is completed. Then, the mobile station MS11 and the originating terminal TE
A call link is formed with L1 and a call can be made thereafter.

That is, when the mobile station MS11 goes off-hook while the calling terminal number is notified, the calling terminal TEL1 is automatically called from the mobile communication control device 40. When the calling terminal TEL1 responds to this call, a call link is formed between the mobile station MS11 and the calling terminal TEL1 and both parties can talk.

As described above, in the present embodiment, when an incoming call is made to the mobile station MS that has gone out of the service area and is in a state where it is not possible to receive the call, the mobile communication control device 40 moves the mobile station position information table 43 to the relevant mobile station position information table 43. The calling terminal number is stored in association with the station MS. After that, when the mobile station MS returns to the range where it can communicate with the mobile station MS, a "call setting" message including the caller terminal number is sent to the mobile station MS, and the caller terminal number is sent to the mobile station MS. It is displayed on the LCD of MS.

Therefore, according to the present embodiment, the user of the mobile station MS returns to the communication enabled state by the notification of the above-mentioned calling terminal number, and the calling terminal TEL is received during the incoming call unanswered period.
It is possible to know from 1 that an incoming call has occurred, and in response to this, it is possible to take an appropriate response such as to immediately contact the user of the originating terminal TEL1.

Since the out-of-service area determination of the mobile station MS and the return from the out-of-service area to the in-service area are performed based on the registration information in the existing mobile station position information table 43, the procedure for each of the above determinations is newly added. Therefore, it is possible to simplify the determination procedure.

Further, in this embodiment, when the user of the mobile station MS11 responds by going off-hook at the time of receiving the notification of the calling terminal number, the incoming call to the calling terminal TEL1 is automatically generated in the mobile communication control device 40. Then, the calling terminal TEL1 is called. Therefore, the mobile station M
After receiving the notification of the calling terminal number, the user of S11 does not perform a dial call operation to the calling terminal TEL1 but simply performs an off-hook operation.
A call can be made with EL1. Therefore, the mobile station M
The labor of the user of S is significantly reduced, which can improve the operability.

(Second Embodiment) In this embodiment, the mobile station MS
When the mobile station MS returns to the service area, the fixed telephone TEL1 that has made a call to the mobile station MS while the mobile station MS is out of the service area is notified of the subscriber number of the mobile station MS. When the fixed-line telephone TEL1 responds by going off-hook, the mobile station MS is called to form a call link with the fixed-line telephone TEL1.

FIG. 12 is a diagram showing an operation sequence in this embodiment. In the figure, the mobile station M in the out-of-range state
The operation sequence until the transmission from the fixed telephone TEL1 to S11 is released by no response from the mobile station is the same as the operation sequence shown in FIG. 10 in the first embodiment. That is, when the "release complete" message arrives, the mobile communication control device 40 stores the calling terminal number in the out-of-service incoming call calling terminal number column of the mobile station position information table 43 in association with the mobile station MS11.

Now, in this state, the mobile station MS11 operates at time t.
1 returns to the wireless zone Zm of the base station BS1. Then, first, between the mobile station MS11 and the mobile communication control device 40, the new wireless zone Zm is set.
The location registration procedure is executed via the base station BSm and the exchange 10. This location registration procedure is also similar to the procedure described in FIG. 11 in the first embodiment.

When the update of the registered position of the mobile station MS11 is completed by the above-mentioned position registration procedure, the mobile communication control unit 40 searches the mobile station position information table 43, whereby the incoming call is made while the mobile station MS11 is out of service area. Is determined. Then, here, in the out-of-service incoming / outgoing terminal number column of the mobile station position information table 43, the mobile station M
Since the subscriber number of the fixed telephone TEL1 is stored in association with S11, the "call setting" message is sent to the fixed telephone TEL1 corresponding to this calling terminal number. In this "call setup" message, the subscriber number of the mobile station MS11 is inserted in the user / user information area.

When the mobile station MS11 receives the "call setup" message addressed to the mobile station MS11, the subscriber number of the mobile station MS11 included in the user / user information area of the "call setup" message is extracted. And displayed on a liquid crystal display (LCD), for example. Therefore, the fixed telephone TE
The user of L1 can see the mobile station MS1 displayed on this LCD.
By looking at the subscriber number of 1, it is possible to recognize that the mobile station MS11 of the other party who has made a call earlier can communicate.

Note that the subscriber number of the mobile station MS11 may be configured to be output in a loud voice from the handset using a voice synthesizing technique together with a guidance message indicating that the mobile station MS11 has become communicable. .

When the user of the fixed telephone TEL1 performs a predetermined operation, for example, an off-hook operation while receiving the notification of the subscriber number of the mobile station MS11, a call request is issued from the fixed telephone TEL1 as shown in FIG. A "additional information" message containing "is sent" is sent to the mobile communication control unit 40 via the exchange 10. Upon receiving this "additional information" message, the mobile communication control device 40 creates a "call setup" message and sends this message to the corresponding mobile station MS11 via the exchange 10 and the base station BSm.

The mobile station MS11 monitors the arrival of the "call setup" message addressed to itself from the base station BSm in the standby state, and receives the "call setup" message addressed to itself in this state. Then, a "call setting acceptance" message is returned to the mobile communication control device 40 via the base station BSm and the exchange 10. Then, thereafter, between the mobile station MS11, the exchange 10, the mobile communication control device 40, and the fixed-point telephone TEL1 of the originator, a "call" message and a "response"
Messages are sent and received as appropriate, and when the sending and receiving of these messages is completed, a call link is formed between the fixed-line telephone TEL1 that is the caller and the mobile station MS11 that is the callee, and the call can be performed thereafter.

That is, the fixed telephone TEL1 simply goes off-hook when the subscriber number of the mobile station MS11 is notified, and the mobile communication control device 40 causes the mobile station M of the destination to receive the call.
The incoming call to S11 is automatically made. Then, when the mobile station MS11 responds to the incoming call, a call link is formed between the mobile station MS11 and the fixed telephone TEL1, and both parties can talk later.

As described above, in this embodiment, when an incoming call is made from the fixed telephone TEL1 to the mobile station MS11 which is out of the service area and is in the state of being unable to receive a call, the mobile communication control device 40 causes the mobile communication control device 40 to make a mobile station position information table. 43 the mobile station MS
The terminal number of the fixed telephone TEL1 is stored in association with. Then, after that, when the mobile station MS11 returns to the range where it can communicate with the mobile station MS11, a "call setting" message including the subscriber number of the mobile station MS11 is transmitted to the fixed-point telephone TEL1 of the originator, Mobile station MS11
Is displayed on the LCD of the fixed telephone TEL1.

Therefore, according to this embodiment, when the mobile station MS11 of the called party returns to the communicable state, the user of the fixed-line telephone TEL1 of the calling party makes the mobile station MS11
It is possible to know that the mobile station MS11 of the called party is ready to answer the incoming call by notifying the subscriber number of.
Therefore, when the incoming call destination mobile station MS11 does not answer the incoming call, the user of the fixed-point telephone TEL1 of the outgoing call origin need only wait for the above notification. Therefore, it is not necessary to repeatedly make a call from the fixed-point telephone TEL1 of the calling source, and as a result, the fixed-point telephone TEL1 of the calling source is
The labor of the user of is greatly reduced and the operability is improved.

Further, since the repeated call origination is not performed, the exchange 10 and the mobile communication control device 40 do not perform useless incoming call processing which does not substantially lead to a call, thereby lowering network traffic. You can Furthermore, since the above-mentioned useless incoming call eliminates the trouble of monopolizing the wireless channel each time,
It is also possible to improve the effective utilization rate of the limited wireless channels held by the base station BS.

Further, in this embodiment, the mobile station MS11
Fixed telephone TEL when the notification of the subscriber number of
When the user of No. 1 responds, for example, by going off-hook, an incoming call to the calling terminal TEL1 is automatically generated in the mobile communication control device 40, and the calling terminal TEL1 is called. Therefore, the user of the fixed-line telephone TEL1 receives the notification of the subscriber number of the called mobile station MS11, and
By simply performing an off-hook operation without performing any dial transmission operation to the transmission terminal TEL1, the mobile station MS11 is connected and a call becomes possible. Therefore, the labor of the user of the fixed-line telephone TEL1 is significantly reduced, and the operability can be improved.

The present invention is not limited to the above embodiments. For example, in each of the above-described embodiments, every time an incoming call is made to the mobile station MS that cannot respond to the incoming call, the terminal number of the sender is unconditionally set in the mobile station position information table 4.
I memorized it in 3. However, the calling terminal number may not necessarily be stored. That is, when an instruction indicating that the mobile station MS does not need to notify the return of the callable state of the mobile station MS is received after transmitting the "release complete" message to the calling terminal, the number of the calling terminal is stored. Is omitted.

In this way, for example, in the case of a less important call, it is possible to prevent the notification after the return of the incoming call enable state. Therefore, it is possible to reduce the troublesomeness on the side of receiving the notification and further reduce the processing load on the mobile communication control device 40 or the like by omitting the procedure for the notification.

Further, in each of the above-mentioned embodiments, when the mobile station MS returns to the state capable of responding to the incoming call, the mobile station MS or the originating fixed telephone TEL is unconditionally notified. However, for example, when the storage period of the calling terminal number exceeds a preset time before the notification is given, the storing of the calling terminal number may be deleted. By doing so, the problem that the stored information of the old incoming call remains forever is solved.

Further, in each of the above embodiments, only the calling terminal number or the mobile station number is notified, but the calling terminal person name or the mobile station name may be notified instead of or in addition to these numbers. Alternatively, the date and time of the incoming call and the message may be stored and notified of them.

In each of the above embodiments, the case where the incoming call from the fixed telephone to the mobile station is described as an example, but the present invention is similarly applied to the case where the incoming call is issued from the mobile station to the mobile station. be able to.

Further, in each of the above embodiments, when the mobile station returns to the incoming call ready state, the fact is notified to either the incoming call destination mobile station or the originating fixed telephone. The notification may be given to both the destination mobile station or the fixed-point telephone of the caller.

Further, in the above embodiment, the mobile communication control device 40 is provided separately from the ISDN network NW, and various communication control relating to the mobile terminal is performed by this mobile communication control device 40. May be provided to the control device in the ISDN network, and the control device may be configured to execute the control relating to the fixed terminal and the control relating to the mobile terminal, respectively.

In addition, the type and configuration of the system, the configuration and functions of the mobile communication control device, various operation sequences, and the like can be variously modified and implemented without departing from the scope of the present invention.

[0090]

As described in detail above, according to the first invention of the present application, when the incoming notification is made to the mobile station, the first status determining means puts the incoming mobile station into a communicable state. If it is determined that the destination mobile station cannot communicate with the destination mobile station, the identification information of the destination mobile station is stored in the storage means. The second state determining means determines whether or not the communication state is restored, and when it is determined that the destination mobile station is restored to the communication state, the identification number stored in the storage means. Based on the above, the mobile station of the called party is notified of the information that the call originated.

Therefore, according to the present invention, when an incoming call is made to a mobile station which cannot answer the incoming call, the user can recognize the occurrence of the incoming call after the mobile station returns to the incoming ready state. In this way, it is possible to provide a mobile communication system that enables appropriate handling of incoming calls.

On the other hand, in the second invention, when the incoming notification is sent to the mobile station, the first status determining means determines whether or not the destination mobile station is in a communicable state,
When it is determined that the destination mobile station cannot communicate, the identification information of the destination mobile station and the identification information of the source terminal are stored in the storage means in association with each other. The second state determining means determines whether the destination mobile station is restored to the communicable state, and when it is determined that the destination mobile station is restored to the communicable state, the storage means stores the information. Based on the stored identification number of the source terminal,
Information indicating that the destination mobile station has been restored to the communicable state is notified to the source terminal.

Therefore, according to the present invention, when the incoming call destination mobile station does not answer the incoming call, after the incoming call destination mobile station returns to a state in which the incoming call is possible, the user of the originating terminal informs the fact. By making it possible to recognize, thereby preventing useless calling operation, and improving the operability of the user,
It is possible to provide a mobile communication system capable of reducing the processing load of exchange control and improving the utilization rate of wireless channels.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a mobile communication system according to a first embodiment of the present invention.

FIG. 2 is a circuit block diagram showing a configuration of a mobile communication control device of the system shown in FIG.

FIG. 3 is a diagram showing a sequence of standard call control signaling procedures performed on the ISDN D channel.

FIG. 4 is a diagram showing an example of the configuration of a “call setup” message used in ISDN.

FIG. 5 is a diagram showing an example of a configuration of a “notification information” message used in ISDN.

[Fig. 6] "Location registration request" used in ISDN
The figure which shows an example of a structure of a message.

7 is a sequence diagram showing an example of a location registration procedure in the system shown in FIG.

8 is a diagram showing an example of the configuration of a mobile station position information table in the mobile communication control device shown in FIG.

9 is a diagram showing an operation sequence when the mobile station receives a call from a fixed telephone in the system shown in FIG.

10 is a diagram showing an operation sequence when an incoming call from a fixed telephone occurs to a mobile station in an out-of-range state in the system shown in FIG.

FIG. 11 is a diagram showing an operation sequence in the case where a mobile station that has been out of range returns to the range in the system shown in FIG. 1;

FIG. 12 is a diagram showing an operation sequence when a mobile station that has been out of range returns to the range in the system according to the second embodiment of the present invention.

[Explanation of symbols]

 NW ... ISDN network TEL1 to TELn ... Fixed telephone BS1 to BSm ... Base station Z1 to Zm ... Radio zone MS11 to MSm4 ... Mobile station 10 ... Exchange 11-11n ... Line interface circuit 21-2m for fixed terminal ... For mobile terminal Line interface circuit 30 ... Line interface circuit for mobile communication control device 40 ... Mobile communication control device 41 ... Microcomputer (CPU) 42 ... ROM 43 ... Mobile station position information table 44 ... ISDN interface circuit 45 ... Maintenance terminal interface circuit 50 ... Maintenance terminal

Claims (7)

[Claims] 1. A plurality of base stations, a mobile station connected to the base station via a wireless line within a wireless zone formed by these base stations, and a plurality of terminals including the mobile station are exchange-connected. A first state for determining whether or not the destination mobile station is in a communicable state when notifying the mobile station of an incoming call. And a storage unit for storing identification information of the mobile station of the destination when the mobile station of the destination is determined to be incommunicable by the first state determination unit. Second for judging whether or not the mobile station of the destination, in which the identification information is stored, is restored to the communicable state
State determining means and the second state determining means determine that the destination mobile station is restored to a communicable state, the destination is based on the identification number stored in the storage means. And a notification control means for notifying the mobile station of the fact that the call originated. 2. The first state determining means and the second state determining means retrieve mobile station location registration information for managing the location of the mobile station with respect to the wireless zone, and receive the mobile station location registration information. The mobile communication system according to claim 1, wherein it is determined whether or not the destination mobile station is in a communicable state by determining whether or not the destination mobile station is registered in location. . 3. The response control means for observing a predetermined response from the destination mobile station after the notification control means notifies the information that the call originated, and the response destination by the response monitoring means. Connection control means for performing a process for connecting between the destination mobile station and the source terminal when it is detected that the mobile station has given a predetermined response. The mobile communication system according to claim 1. 4. A switching connection between a plurality of base stations, a mobile station connected to the base station via a wireless line within a wireless zone formed by these base stations, and a plurality of terminals including the mobile station. A first state for determining whether or not the destination mobile station is in a communicable state when notifying the mobile station of an incoming call. When the determination means and the first state determination means determine that the destination mobile station cannot communicate, the identification information of the destination mobile station and the identification information of the source terminal are associated with each other. And a second storage unit for determining whether or not the destination mobile station whose identification information is stored in the storage unit is restored to a communicable state.
And the second state determining means determines that the identification number of the source terminal stored in the storage means is determined when the destination mobile station is restored to the communicable state. On the basis of,
A mobile communication system comprising: a notification control means for notifying the originator terminal of information indicating that the destination mobile station has recovered to a communicable state. 5. The storage means, when it is determined that the destination mobile station cannot communicate, requests the notification that the destination mobile station has recovered to the state of communication, which is sent from the source terminal. If the information indicating that the notification is not desired is stored in the storage means, the notification control means restores the mobile station of the destination to the communicable state. However, the mobile communication system according to claim 4, wherein the mobile terminal of the callee does not notify the caller terminal of the call to the communication-ready state. 6. The storage means has means for determining a storage period of the identification information, and the storage period of the identification information is stored before the destination mobile station storing the identification information is restored to a communicable state. The mobile communication system according to claim 4, wherein the storage of the identification information is erased when exceeds a preset period. 7. A notification control means for monitoring a predetermined response from a terminal of the caller after notifying the terminal of the caller of the information that the mobile station of the callee is restored to the communicable state. Response monitoring means and processing for connecting between the source terminal and the destination mobile station when the response monitoring means detects that the source terminal has made a predetermined response. 5. The mobile communication system according to claim 4, further comprising a connection control means for performing the following.