JPH08195983A - Portable telephone system and call method utilizing cordless telephone - Google Patents

Abstract

PURPOSE: To call a slave unit present in the radio zone of a master unit just by specifying a portable terminal telephone number by establishing a telephone line to the unit to be called through the master unit of the called unit searched based on the individual portable terminal number of the slave unit. CONSTITUTION: The slave unit MS1 or the like to which an intrinsic portable terminal number is imparted is used as the slave unit MS1 of the master unit FS1 in the radio area FA1 or the like of the master unit FS1 or the like and the slave unit MS1 becomes an independent portable terminal outside the area FA1 or the like. Then, for instance, when the slave unit MS1 present in the area FA1 calls the slave unit MS2 by the portable terminal number, as long as the slave unit MS2 is present within the radio area FA2 of the master unit FS2, a subscribing telephone line is established through the master units FS1 and FS2 and the slave unit present in the radio zone of the master unit is called just by specifying the portable termial telephone number. Also, when the slave unit MS2 is present at the outside of the area FA, voice mail transfer is performed without performing call-back by calling a pager.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile phone system using a cordless phone, and in particular to a standard (RCR / STD) established by the Radio System Development Center (abbreviated as RCR).
-28) compliant second generation cordless telephone system.

[0002]

2. Description of the Related Art A second-generation cordless telephone system is a system in which a so-called cordless telephone handset can also be used as a terminal of a portable radio telephone. In the case of this telephone system, each child device is used as a child device of a cordless telephone within the wireless area of the parent device (for example, indoors) and as an independent mobile terminal outside the wireless area of the parent device (for example, outdoors). . An individual mobile terminal number is assigned to each child device in addition to the subscriber telephone number. This number is used as an identification number when wireless communication is performed with any base station when the handset makes a call, and is used to receive a call from any base station (incoming call). It is also used as an identification number.

The biggest problem of the second-generation mobile phone system is that the location registration function (registering which base station is in the wireless area of each base station is registered in order to be able to receive this call. Function). Due to the location registration, the entire network including the switching equipment, the transmission equipment and their control equipment becomes large and complicated. Moreover, the cost required for location management is different from the case of normal call cost, and it is difficult to target individual charges for subscribers, so there is no choice but to add to the subscription charge or basic charge. This is one of the factors that delay the spread of mobile phones. This problem is further exacerbated because there are many subscribers who frequently move between different wireless areas and have more location registrations than incoming calls.

For this reason, a mobile phone system for call origination has been proposed which does not perform location registration and therefore does not have an incoming call function. Further, such a mobile phone system is provided with a pager call receiving function (pager). A mobile phone system incorporated in a machine has been proposed (for example, Japanese Patent Laid-Open No. 4-25 / 1992).
9130). In this telephone system, the slave unit is used as a portable terminal for making a call, and when the slave unit is outside the wireless area of the master unit, a pager call is made to call back. However, when this telephone system is adopted, a child device located outside the wireless area of the parent device cannot directly call back the calling child device to another child device.
The destination to be called back is limited to a wired terminal (master device) or another mobile terminal capable of receiving an incoming call. In addition, even if the calling handset returns to the wireless area of the base unit, an incoming call cannot be made using the mobile terminal number. This is because it is not possible to establish a subscriber telephone line from the base unit to the calling handset.

Another problem of the mobile phone system employing the pager calling is that the display capacity of the liquid crystal display of the handset has its own limit, so that the information that can be transmitted to the called party is the terminal number of the call back destination or at most. It's just a short note. Therefore, it is necessary to call back the calling party in order to confirm the calling party's person or requirement, but as a result of the callback, the calling party's person or requirement is not preferable to the called party. May be found and pager calls are not always convenient for the called party.

[0006]

SUMMARY OF THE INVENTION A main object of the present invention is to provide an improved mobile telephone system which can call a slave unit by using the terminal number of the slave unit.

Another object of the present invention is to provide an improved portable telephone which allows a person who receives a pager call to obtain some information about a caller's name and requirements without calling back. To provide a system.

[0008]

The greatest feature of the present invention is that when the terminal number of the called terminal designated by the caller is the portable terminal number of the cordless telephone handset, the base unit is searched from the terminal number. However, the network side is provided with means for establishing a subscriber telephone line from the base unit to the called unit.

Another feature of the present invention is that a means for switching to a pager call is provided on the network side when the called handset does not respond to a call specifying a mobile terminal number.

Still another feature is that, when switching to a pager call, the voice mail is stored at the request of the calling party, and after the storing, the voice mail is switched to the pager calling, and at the request of the called party who received the pager calling. , A means for transferring the voice mail to the called party is provided on the network side.

The means for establishing a subscriber telephone line to the called slave unit includes a database for storing the correspondence between the mobile terminal number of the slave unit and the network address number of the master unit.
By accessing the database in response to a call request that specifies the mobile terminal number of the slave, and searching the network address number of the master of the called slave based on the mobile terminal number, using the searched network address It can be realized by using a means for calling the parent device.

The means for switching to the pager call and calling the slave unit are the same as the means for detecting that the called slave unit does not respond to the call specifying the mobile terminal number and the mobile terminal number of the slave unit. The database that stores the correspondence with the pager calling number of the slave and the pager calling number of the called slave based on the mobile terminal number are accessed after detecting that the called slave does not respond. It can be realized by using a means for searching and a means for calling the pager of the called machine using the searched pager calling number.

The means for transferring the voice mail of the calling party to the called party is based on the detection result, and means for detecting that the called handset does not respond to a call designated by the mobile terminal number. Means for requesting the caller to input a voicemail, means for storing the voicemail by adding the terminal number (mobile terminal number or subscriber telephone number) of the calling terminal and the mobile terminal number of the called child device, This can be realized by using a unit that transfers the voice mail to the called terminal when a read request is issued from the call subunit.

[0014]

In the mobile phone system according to the present invention, the terminal number of the called terminal designated by the caller (including the caller of the callback for the pager call) is the mobile terminal number of the handset. Also, since the master unit of the slave unit is searched and the master unit is called and the subscriber telephone line is determined through the master unit, the slave unit that is the called terminal is within the wireless area of the master unit. As long as it is, the call between the calling party and the called party (user of the child machine) becomes possible only by designating the mobile terminal number of the child machine. If the cordless handset, which is the called terminal, is outside the radio area of the base unit, the handset cannot be called via the base unit, but in that case, by changing to a pager call, the call back is made. It is possible to request a call from the called terminal.

If a means for storing the voice mail and transferring it to the called terminal is provided, the pager caller (caller) can be called even if the user of the handset receiving the pager does not call back. ), It is possible to obtain information about the person or the requirement of the above) and prevent the situation in which the person who is not preferable to the called party as a result of the callback is identified for the first time. It is very convenient.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The mobile phone system according to the present invention will be described in more detail below with reference to the embodiments shown in the drawings. FIG. 1 shows a conceptual network configuration of the mobile phone system of the present invention.
Shown in In the figure, LS is a subscriber exchange connected to the base unit FS via a subscriber line (wired line), CS is a call base station connected to the handset MS via a wireless line during a call, and PS is a pager. Handset MS via calling base station PCS
, A pager calling station for making a pager call, a TS for a repeater exchange of a trunk line, a DB for storing a data required for a call or a pager call,
The CSN is a common line signaling network (hereinafter simply referred to as "common line") for transmitting signal information among the subscriber exchange LS, the transit exchange TS, and the database DB, FA is a radio area of the master FS, and CA is The radio area of the call base station CS and PA indicate the radio area of the pager calling base station PCS, respectively. Since the output of the pager calling base station PCS is much larger than that of the call base station CS, its wireless area PA is much wider than the wireless area CA of the call base station CS.

The call base station CS transfers a call request arriving from the handset MS to the exchange LS, establishes a wireless call path between itself and the handset MS, and is used together with a portable terminal capable of receiving a call. If so, the terminal is called and the location registration request arrived from the terminal is received and transferred.

The subscriber exchange LS has a call path (self-main unit FS or self-call base station) corresponding to a call request from the slave MS received via the base unit FS or the call base station CS. Establishing a communication path with CS and a communication path between itself and another exchange LS), calling the slave MS via the master FS (call base station CS if there is a portable terminal capable of receiving a call) (Including calling mobile terminals via the Internet), receiving and storing voice mails of callers (including providing voice guidance), accessing the database DB via the common line CSN, and joining individual subscribers. Performs the task of obtaining the network address number of the telephone (hereinafter simply referred to as "address number").

The base unit FS includes other terminals that have arrived via the exchange LS (only a base unit and a handset of a cordless telephone are shown in FIG. 1, but other subscriber telephones or portable terminals capable of receiving calls are included. The same applies hereinafter)
Is performed, a wireless communication path is established between the mobile device MS and the mobile device MS, and a call request arriving from the mobile device MS is transferred to the exchange LS.

In the database DB, in addition to the mobile terminal numbers of all the slaves, data indicating the correspondence between the mobile terminal numbers of the slaves and the address numbers of the masters and the mobile terminal numbers of the slaves are stored. Data indicating the correspondence with the pager calling number is stored.

The handset MS has a pager call receiving function, functions as a handset of a cordless telephone within the radio area FA of the base unit FS, and functions as a mobile terminal dedicated to transmission outside the radio area FA of the base unit FS. . The slave MS is the master F
A radio communication path is formed with S or with any of the communication base stations CS. A mobile terminal number different from the subscriber telephone number given to the parent device FS is given to the child device MS. This terminal number is used by the user of the mobile device MS to call the base station C.
Besides being used when calling another terminal via S, it can also be used as a designated destination of a callback when making a pager call. As in the conventional mobile phone system, when a user of another terminal calls the child device MS, the terminal number (subscribed telephone number) of the parent device FS is used and the intended child device MS is accessed via the parent device FS. Of course, it is possible to call. In addition, a pager calling number is assigned to each of the child devices MS separately from the mobile terminal number, and when the child device MS is outside the wireless area FA of the parent device FS and cannot answer a call of another terminal. , The pager is called using this calling number.

The subscriber exchange LS, as shown in FIG.
A service switching point 301 (on the left side of the drawing) for exchanging user information (mainly voice information and data information) and control information and a call connection process, and an intelligent peripheral 302 (for executing a process related to voice mail). A service control point 303 (bottom right of the drawing) for accessing a database (not shown) and controlling the point 301 and the peripheral 302 is configured.

The switching point 301 includes a trunk line interface 310 and a call base station interface 31.
1, a subscriber line interface 312 and a line switch 313, a CPU (central processing unit) 315 for controlling the interfaces 310 to 312, and a memory 314 for storing a control program such as call connection processing. ing.

The line switch 313 is composed of a time switch and a space switch, and is used for distributing user information among the interfaces 310 to 312. The call base station interface 311 and the subscriber line interface 312 are used for exchanging control information and user information between the CPU 315 and the line switch 313 and the call base station or the master unit (not shown). The service switching point 301 connects a database (not shown) to the common line interface 316.
It is used to connect to the intelligent peripheral 302, the service control point 303, etc. via the.

When access to a database (not shown) or input / output of voice mail is required during call connection processing, the CPU of the service switching point 301
315 requests the service control point 303 to perform the processing via the common line interface 316.

The service control point 303 is the CPU 3
31, a memory 333 and an interface 332. The memory 333 stores a voice mail processing program, a database access program, and the like. CPU31 of switching point 301
When there is a request from 5, the control point accesses the database, searches for the address number of the master unit and the pager calling number of the slave unit using the terminal number of the slave unit as a key, and then inputs / outputs voice mail. To the intelligent peripheral 302.

The intelligent peripheral 302 is
CPU 321, memory 324, voice input / output device 325,
It is composed of two interfaces 322 and 323. The memory 324 stores a voicemail input / output control program. Service control point 303
When requested by the peripheral, this peripheral sends the voice mail sent from the calling terminal via the line switch 313 and the interface 322 to the voice input / output device 32.
Called terminal (slave unit) that receives a pager call, or stores a voice mail stored in the device
Performs tasks such as sending voicemail to and providing voicemail input / output guidance to the calling or called party. When the voice mail is stored in the voice input / output device 325, the terminal number (subscribing telephone number or mobile terminal number) of the calling terminal and the mobile terminal number of the called slave are added.

The service switching point 301 executes the instruction of the service control point 303 to establish a communication path between the intelligent peripheral 302 and the calling terminal or the called terminal.

FIG. 2 shows a specific example of the slave unit used in the present invention. This cordless handset is equipped with a cordless telephone antenna 20.
4, a pager calling antenna 201 is provided. The cordless telephone antenna 204 is used for communication with the base unit FS or the communication base station CS (see FIG. 1), and is a base via the transmission / reception separator 205, the high frequency reception circuit 206, or the high frequency transmission circuit 207. It is connected to the band signal processing circuit 203. The pager calling antenna 201 is connected to a baseband signal processing circuit 203 via a high frequency receiving circuit 202. Reference numeral 208 is a speaker, 209 is a microphone, and 210 is a control unit for the entire slave unit.

The high frequency receiving circuit 202 frequency-converts and detects a radio frequency band signal received by the cordless telephone antenna 204, extracts a baseband signal, and supplies it to the baseband signal processing circuit 203. The processing circuit 203 separates the audio information and the control information included in the baseband signal, and separates the speaker 208 and the control unit 21.
0, the microphone 209 and the control unit 21.
The audio information and the control information supplied from 0 are multiplexed and transmitted to the high frequency transmission circuit 207. The transmission circuit 207 modulates the output signal of the baseband signal processing circuit 203 and frequency-converts it to generate a signal in the radio frequency band to generate the antenna 2
Send from 04.

The control unit 210 of the slave unit includes a display unit 212, a key input unit 213, a microprocessor 211, and a ROM.
It is composed of a (read only memory) 214 and a RAM (random access memory) 215. RAM215
Is used to store the terminal number of the pager calling terminal. The ROM 214 has a call control program (a program for controlling outgoing and incoming calls) and a pager call control program (which sounds the speaker 208 when a pager call is received, and outputs the pager caller's terminal number RA).
It is used to store the control program for storing in M215), as well as to store the mobile terminal number and pager calling number of its own.

The display section 212 is used to display the pager caller's terminal number (portable terminal number or subscriber telephone number) when there is a pager call, and when the call is made by itself, the caller's terminal. Used to display numbers.
Although not shown in detail, a means for recording in advance the name, etc. of the person who is expected to call the own machine, the subscriber's telephone number and the terminal number of the mobile terminal, and the terminal number to the number. If a means for searching for a corresponding name or the like is added to the child device, it is convenient that the name and the like of the caller can be displayed on the display unit 212 when a pager call or a normal call is received. .

FIG. 10 shows the appearance of the child device. Key input part 2
Reference numeral 13 includes a ten-key pad, an On / Off hook button, a call button, a voice mail button, a list button, a clear button, and four arrow buttons up, down, left and right. The call button is used to call another terminal and call back the pager caller. The voice mail button is used to read the voice mail. The list button is used to display the pager caller's terminal number stored in the RAM 215. When the terminal numbers of a plurality of pager callers are stored in the RAM 215, the display is selected by operating the arrow buttons. The clear button is used to delete the pager caller's terminal number stored in the RAM 215.

When calling another terminal, as shown in FIG. 5, the On / Off hook button is first pushed to put the slave unit in the off-hook state [502], and the ten key is operated to input the terminal number of the calling party [. 503]. Then, the call button is pressed [504]. A call request is transmitted from the antenna of the child device. This call request is sent to the subscriber exchange via the base unit if the cordless handset is within the radio range of the base unit and via the call base station if the handset is outside the radio range of the base unit. To be done.

When the partner terminal responds [505], the call [506] is performed with the terminal, and then On / O
ff Press the hook button to open the communication path [508,
509]. When the partner terminal (child device) does not respond [50
5] inputs voice mail according to the voice guidance sent from the network [507], and then O
Press the n / Off hook button to open the communication path [5
08, 509].

When reading a voice mail, as shown in FIG. 7, first, the On / Off hook button is pushed to put the handset in the off-hook state [702]. Next, when the list button is pressed [703], the terminal numbers of pager callers stored in the RAM 215 (FIG. 2) of the child device are displayed on the display unit 212 as a list. When the terminal number of the pager caller who wants to read the voice mail is selected using the arrow keys [704], an arrow is displayed next to the selected terminal number as shown in the display section 212 of FIG. When the voice mail button is pressed after selecting the desired terminal number [705], a read request is transmitted from the antenna of the child device. This read request is transmitted to the subscriber exchange through the master unit when the slave unit is within the wireless area of the master unit and through the call base station when the slave unit is outside the wireless area of the master unit. It Following the voice guidance, the voice mail transmitted from the network is received [706]. When the reception is completed, the On / Off hook button is pushed to open the communication path [707, 708].

When calling back to the pager caller, as shown in FIG. 9, the On / Off hook button is first pushed to put the slave unit in the off-hook state [709]. Next, when the list button is pressed [903], RAM2 of the child device
The terminal numbers of pager callers stored in 15 (FIG. 2) are displayed on the display unit 212 as a list. When the terminal number of the pager who wants to call back is selected using the arrow keys [904], an arrow is displayed next to the selected terminal number. When the call button is pressed after selecting the desired terminal number [905], the call-out request for callback is transmitted from the antenna of the slave unit [802]. This call request is transmitted to the subscriber exchange through the master unit when the slave unit is within the wireless area of the master unit and through the call base station when the slave unit is outside the wireless area of the master unit. It When the call connection processing by the network is completed and the pager caller responds, the call is made as it is [907]. When the pager caller does not respond and there is a voice mail input request from the network, the voice mail is input according to the guidance [908]. When the call ends or voice mail input ends, press the On / Off hook button to release the call path.

[909].

The operation of the network when the handset MS1 calls another handset MS2 will be described in more detail with reference to FIG. However, the handset MS1, which is the calling terminal, is located within the wireless area of the base unit FS1 and is the handset M that is the called terminal.
It is assumed that S2 is outside the wireless area of the parent device FS2.
In this case, since the handset MS2 does not respond to the call of the handset MS1, the calling side exchange LS1 requests the handset MS1 to input a voicemail, and automatically sends the voicemail sent thereto. Database DB after storing in machine memory
To retrieve the pager calling number corresponding to the terminal number of the handset MS2, and transmit the number to the pager calling station PS via the common line CSN.

The pager calling station PS is connected to the calling side exchange LS.
The pager calling number is sent from No. 1 to execute the pager calling through the pager calling base station PCS. The handset MS2 receiving the pager call receives the handset M simultaneously received.
The terminal number of S1 is stored in its own memory, and a request for reading voicemail or making a call-back request is made using the terminal number (via the call base station CS2 to which the child device MS2 belongs).

As is well known, when the pager call is adopted, it is not necessary to register the position information of the child device one by one.
For this reason, it is possible to reduce the load on the in-switch processor required for location management, and to reduce the control information traffic that passes through the call base station, switch, common signal line, etc. when updating location information. The overall size of the system can be reduced. However, a normal pager call is only to display the terminal number of the calling terminal and a very simple memo on the LCD of the handset, so the handset, which is the calling terminal, is outside the wireless area of the base unit. Therefore, if the call back from the callee cannot be answered, communication between the caller and the callee becomes impossible. On the other hand, in the case of the present invention, even if the caller cannot respond to the call back of the called party, the voice mail of the calling party stored in the exchange is read to communicate to some extent. A calling sequence in the case where the child device MS1 capable of achieving the above-mentioned operation calls the child device MS2 will be described with reference to FIG. In order to allow the mobile device MS1 to call the mobile device MS2, the subscriber exchange L that manages the mobile device MS1.
It is necessary to establish a speech path between S1 (hereinafter referred to as "calling side exchange") and the subscriber exchange LS2 (hereinafter referred to as "callee side exchange") that controls the mobile station MS2. This process is started by the caller (user of the child device MS1) making a call request via the parent device FS1 [40
2].

The calling side exchange LS1 notifies the handset MS1 via the base unit FS1 that it has accepted the call origination request [403] and also accesses the database DB to identify the terminal number MSN of the handset MS2. The parent machine FS as a key
The address number NA of 2 is searched [404, 405].
The calling exchange LS1 selects the transit exchange TS1 on the route leading to the called exchange LS2 based on the address number NA of the parent exchange FS2 obtained by the search, and calls between the exchange and the own exchange. Establish a path [406]. In this embodiment, the message for establishing the communication path is No. The initial address message IAM, which is a 7-signal ISDN user part (ISUP) message, was used (the same applies to other messages used in the following description).

The initial address message IAM includes the address number NA of the master station FS2, and the transit exchange TS1 is based on this address number, and the other exchange exchange T on the route to the called exchange LS2.
S2 is selected to establish a communication path between the exchange and the own device [406]. The repeater exchange TS2 establishes a speech path between the called exchange LS2 and itself by the same procedure [406].

The called side exchange LS2 determines whether the base unit FS2 is available or busy based on the received initial address message IAM, and if it is available, sends a call setup request for the handset MS2 to the same. With [407],
An address complete message ACM indicating the completion of the address is returned to the transit exchange TS2 [40
8]. This message is transmitted to the calling side exchange LS1 via the transit exchange TS1.

The base unit FS2 calls the handset MS2 in response to the call setting request [407] from the called side exchange LS2. However, since the base unit FS2 is outside the radio area of the base unit FS2, the base unit FS2 is called. Does not respond to. The called exchange LS2
It detects that the handset MS2 is not responding [409] and at the same time sends back a call progress message CPG to the transit exchange TS2. This message is transmitted by the transit exchange T.
It is transmitted to the calling side exchange LS1 via S1 [4
10].

The calling side exchange LS1 recognizes the non-response of the handset MS2 based on the received call progress message CPG and changes the calling method from the normal calling method to the pager calling method. Switch LS1
Notifies the caller (user of the handset MS1) of the change of the calling method and transmits [412] voice guidance [411] showing the input procedure of the voice mail.

When the caller wants to call the pager and record the voice mail, the microphone 209 of the handset MS1 is used.
Input a voice mail using (Figs. 2 and 10) [413]. This voice mail is sent to the called party (handset MS2
It is held until the reading by the user) is completed. After inputting the voice mail, the caller hooks the handset MS1 [415]. If the caller does not want to call the pager, he immediately hooks the handset MS1.

When the calling party hooks the handset MS1 on,
The request to release the communication path is issued from the calling side exchange L via the master unit FS1.
It is transmitted to S1 [415]. Upon receiving the release request, the calling exchange LS1 requests the relay exchange TS1 to release the communication line between itself and the release message R.
At the same time as transmitting EL [416], a call disconnection message is transmitted to the child device MS1 via the parent device FS to disconnect the communication path with the device [419].

Upon receipt of the release message REL, the transit exchange TS1 sends the message REL to the transit exchange TS.
2 to [417] and, at the same time, the calling side exchange LS1
The communication path to and from is released, and the release complete message RLC is returned to the calling exchange LS1 [42
0]. Upon receipt of the release message REL, the transit exchange TS2 transfers the message REL to the called exchange LS2 [418] and at the same time releases the communication path with the transit exchange TS1 to release the release complete message R2.
The LC is returned to the transit exchange TS1 [421].

After the communication path is released, the calling side exchange LS
1 accesses the database DB [423] and converts the terminal number MSN of the handset MS2 into the pager calling number PSN [424]. At the same time, the calling exchange LS1
Pager calling station PS via common line CSN (Fig. 1)
Request a pager call to (pager call base station PCS) [425].

The pager calling base station PCS uses the pager calling number PSN to execute a pager calling to the handset MS2 [427]. Since the wireless area of the pager calling base station PCS is very large, it is possible to easily call the child device MS2 located outside the wireless area of the parent device FS2. The pager calling signal includes the pager calling number PSN of the handset MS2 and the terminal number MSN of the handset MS1 which is the calling terminal. The handset MS2 that has received the pager call is the handset MS1 included in the pager call signal.
The terminal number MSN is stored in its own RAM (FIG. 2) and a voice call is executed by the speaker (FIGS. 2 and 10).

Next, the sequence in which the called party who receives the pager call reads the voice mail will be described with reference to FIG. When the called party wants to read the voice mail, the display of the handset MS2 (FIGS. 2 and 10) shows the handset MS1.
Display the terminal number MSN of
Press 0). As a result, a call request including a voice mail read request is transmitted together with the terminal number of the handset MS1 [602]. In this case, the transmission of the calling request is performed by the handset M.
Since S2 does not exist within the wireless area of the base unit, the call is performed via the nearest call base station CS2.

Upon receiving the voice mail read request, the called exchange LS2 accesses the database DB [604].
The terminal number MS of the child device MS1 included in the read request
After converting N into the address number NA of the parent machine [605], the call path between the own machine and the calling side exchange LS1 is established [606] by the procedure opposite to the case of calling.

The initial address message IAM is used for establishing the communication path, as in the case of calling, but the message in this case includes the designation information for reading the voice mail. The initial address message IAM is transmitted to the calling side exchange LS1 via the transit exchanges TS1 and TS1. When the call path between the called side exchange LS2 and the calling side exchange LS1 is established by the initial address message IAM, the calling side exchange L
S1 returns the address complete message ACM to the called side exchange LS2 [607].

Subsequently, the calling exchange LS1 sends a call progress message CPG indicating that the intelligent peripheral (FIG. 3) is being called to the called exchange L.
It is transmitted to S2 [608]. Called side exchange LS2
Sends this message to the mobile station MS via the call base station CS.
2 to [609]. When the intelligent peripheral responds, the called exchange LS2 sends an answer message ANM indicating that the intelligent peripheral is responding to the called exchange LS2 [61].
0]. The called exchange LS2 transfers the message to the handset MS2 via the call base station CS [611].

After transmitting the answer message ANM, the calling side exchange LS1 reads the voice mail of the calling party stored in itself and transmits it to the called side exchange LS2. This voice mail is transferred to the handset MS2 via the call base station CS [613].

The called party who receives the voice mail pushes the On / Off hook button (FIG. 10) of the handset MS2,
A request for releasing the call path is transmitted to the called side exchange LS2 via the call base station CS2 [614]. Called side exchange LS2
Sends a release message REL to the calling exchange LS1 [615, 616, 617] and returns a disconnect message to the handset MS2 [618]. The calling side exchange LS1 which has received the release message REL sends the release complete message RLC to the called side exchange L.
It returns to S2 [619, 620, 621]. As a result, the speech path established by the initial address message IAM is released.

Next, the sequence when the called party who receives the pager call back the calling party will be described with reference to FIG. The called party who wants to call back presses the list button of the handset MS2 and calls the terminal number MS of the calling party.
N is displayed on the display unit of the handset MS2 (see FIG. 10). Then, after the terminal number to be called back is selected and the call button of the handset MS2 is pressed, a call request is transmitted [802]. The transmission of the calling request is performed via the nearest call base station CS2, since the handset MS2 is not within the radio area of the base unit.

Following the transmission of the calling request, the called side exchange LS
2 establishes a speech path between the calling party LS1 and the calling party LS1. Therefore, the called exchange LS2 accesses the database DB [804] and converts the terminal number MSN of the slave MS1 into the address number NA of the master FS1 [805]. The call path between the called side exchange LS2 and the calling side exchange LS1 is established using the initial address message IAM as in the case where the handset MS1 calls the handset MS2 [806]. When the call path between the called exchange LS2 and the calling exchange LS1 is secured by the initial address message IAM, the calling exchange LS1 sends the address complete message ACM to the called exchange LS2.
Return to [808].

The calling exchange LS1 sends a call setup request to the handset MS1 via the base unit FS1 at the same time as sending the address complete message ACM [807]. When the calling of the user (calling party) is started in the handset MS1, the calling display is returned to the calling side exchange LS1 [8].
09]. The calling side exchange LS1 transmits to the called side exchange LS2 by using a call progress message CPG that the handset MS1 is ringing [810]. Upon receiving this message, the exchange LS2 on the called side notifies the handset MS2 that the handset MS1 is busy [811].

When the handset MS1 responds, an answer message ANM is transmitted from the calling side exchange LS1 to the called side exchange LS2 [812, 813]. At the same time, the called-side exchange LS2 notifies the handset MS2 that the handset MS1 is responding [814]. When this message is transmitted, a callback call is started between the handset MS1 and the handset MS2 [815]. The call is made via the call path established by the initial address message IAM.

When the call ends, either the caller (callee of the call back) or the callee (caller of the call back) presses the On / Off hook button of the own device. FIG. 8 shows a case where the user of the handset MS1 requests the release of the communication path, and a release request is transmitted from the handset MS1 to the calling side exchange LS1 [816].

The calling exchange LS1 sends a release message REL to the called exchange LS2 [817, 8].
20, 822] together with the same message REL to handset M
It returns to S1 [818]. Release message REL
The called exchange LS2 that has received the message returns a release complete message RLC to the calling exchange LS1 [821, 823, 825]. As a result, the communication path established by the initial address message IAM is released and can be used by another terminal.

In the call path between the called exchange LS2 and the slave MS2, the called exchange LS2 sends a release request to the slave MS2 via the call base station CS2 [824].
The handset MS2 sends a disconnection message to the call base station CS2 as well.
It is possible to release it by returning [826] to the called exchange LS2 via the call, and by the called exchange LS2 returning a restoration completion message to the handset MS2 via the call base station CS2 [827]. Is.

As described above, according to the present invention, even when the cordless telephone handset is located outside the radio area of the parent and is in a call-only state, a pager call is made to the called terminal. By calling back to the child machine,
It becomes possible to realize a call with another terminal. Since the handset is dedicated to making calls, it is desirable to be located within the radio area of the base unit in preparation for callback.
When the cordless handset cordless handset moves out of the radio area of the parent cordless handset, a call with the cordless handset cordless handset is made by, for example, making a pager call to the cordless handset and calling back again. Can be realized.

[0065]

According to the present invention, the handset is capable of making a call while being dedicated to making a call, and when there is no response, the handset is switched to a pager call, and the handset receiving the pager call sends a voice mail of the caller. Since the information can be read, the sender's will can be sufficiently transmitted. as a result,
It is possible to greatly improve the practicability of the mobile phone system in which the handset is dedicated to making a call and a pager call is introduced to reduce the equipment amount.

[Brief description of drawings]

FIG. 1 is a system diagram for explaining an overall configuration of an embodiment of a mobile phone system using a cordless phone according to the present invention.

FIG. 2 is a system diagram for explaining a child device of the mobile phone system shown in FIG.

3 is a system diagram for explaining a subscriber exchange of the mobile phone system shown in FIG.

FIG. 4 is a time system diagram for explaining a calling sequence when a calling handset calls a called handset.

FIG. 5 is a system diagram for explaining the operation of the child device when calling another terminal.

FIG. 6 is a time system diagram for explaining a sequence when a called party who receives a pager call reads a voice mail.

FIG. 7 is a system diagram for explaining an operation of a child device when reading a voice mail.

FIG. 8 is a time system diagram for explaining a sequence when a called party who receives a pager call backs a calling party.

FIG. 9 is a system diagram for explaining the operation of the child device when the called party calls back to the pager calling party.

10 is an external view showing a key arrangement of the child device shown in FIG.

[Explanation of symbols]

 LS ... Subscriber switch FS ... Parent unit CS ... Call base station MS ... Slave unit FA ... Parent unit wireless area PS ... Pager calling station PCS ... Pager calling base station TS ... Transit exchange DB ... Database CSN ... Common Line signaling network FA ... Base station wireless area CA ... Call base station wireless area PA ... Pager calling base station wireless area 210 ... Control unit 301 ... Service switching point 302 ... Intelligent peripheral 303 ... Service control point

Claims (7)

[Claims] 1. A cordless telephone handset to which an individual mobile terminal number is assigned separately from a subscriber telephone number is used as a handset of the base unit within the radio area of the base unit, and is independent outside the radio area of the base unit. In the mobile phone system used as the mobile terminal of the mobile phone system, when there is a call request specifying the mobile terminal number of the slave, the mobile phone system searches for the master of the called slave based on the terminal number, A mobile telephone system using a cordless telephone, characterized in that it is provided with means for establishing a subscriber telephone line from a base unit to a called unit. 2. A database for storing correspondence between a mobile terminal number of a slave and a network address number of a master, said means for establishing a subscriber telephone line to a called slave.
Access the database in response to a call request that specifies the mobile terminal number of the cordless handset, and use the searched network address number and the means for searching the network address number of the base unit of the called child device based on the mobile terminal number. The mobile phone system according to claim 1, further comprising means for calling the base unit. 3. A slave unit is used as a mobile terminal exclusively for transmission,
The mobile phone system according to claim 1 or 2, further comprising: means for switching to a pager call and calling the slave unit when the slave unit does not respond to a call through the master unit. . 4. The means for switching to a pager call to call the slave unit, means for detecting that the called slave unit does not respond to a call specifying a mobile terminal number, and the mobile terminal number of the slave unit. And the database that stores the correspondence between the pager calling number of the same child machine and the pager calling number of the called child machine based on the mobile terminal number after detecting that the called child machine does not respond. 4. The mobile phone system according to claim 3, further comprising means for retrieving a number and means for performing a pager call of the called slave by using the retrieved pager call number. 5. A means for storing a voice mail of a calling party (pager caller) and transferring it to a called party (user of a handset having received the pager call) is further provided. The mobile phone system according to claim 3 or 4. 6. The means for transferring a voice mail of a calling party to a called party includes means for detecting that the called handset is not responding to a call specifying a mobile terminal number, and a detection result. A means for requesting the caller to input a voice mail based on the above, and a means for storing the voice mail by adding the terminal number (mobile terminal number or subscriber telephone number) of the calling terminal and the mobile terminal number of the called terminal. 6. The mobile phone system according to claim 5, further comprising means for transferring the voice mail to the called terminal when there is a read request from the called child device. 7. A cordless telephone cordless handset to which an individual mobile terminal number is given separately from a subscriber telephone number is used as a cordless handset of the parent cordless handset within the radio area of the parent telephone and independent outside the radio area of the parent telephone. In a mobile phone system used as a mobile terminal of a mobile phone, when there is a call request specifying a mobile terminal number of a slave unit, the master unit of the called slave unit is searched and called based on the terminal number. How to call a mobile phone system.