JPH1094037A - Mobile communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To register the position of a mobile terminal equipment to a public network and any of one private network or over. SOLUTION: A mobile terminal equipment 4 selects a base station attached to a network whose reception power indicates a communication proper level and which provides least cost routing among a public network base station 15 and private network base stations 22,32,33 and registers its position to a selected base station of the network. In the case that the position registration is made to the private network 2, or 3, the position registration is reported to the public network l via the private network. The public network 1 stores the network to which the mobile terminal equipment 4 makes position registration to a position registration database 14. When the reception power of a base station of a network providing less communication charge than that of the network to which the position registration is made at present reaches a communication proper level, the position registration is switched to the network of the base station. In the case that the position registration is switched between private networks, the changeover of the position registration is reported to the public network 1 via the private network and the public network 1 stores it. Upon the receipt of a call reception request by the public network 1, the public network 1 calls the mobile terminal equipment 4 from the network to which the mobile terminal equipment 4 makes the position registration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile telephone communication system and a digital cellular communication system.
The present invention relates to a mobile communication system using a mobile terminal, a base station of a public network and a private network, and a switching system.

[0002]

2. Description of the Related Art In such a mobile communication system, usually, in a public network, a mobile terminal is notified of a communication area to a base station and location registration is performed. In this way, the public network determines a communication area to call when receiving an incoming call to the mobile terminal. If the mobile terminal does not perform the above location registration, the public network must call all communication areas, so that the traffic volume on the network increases extremely. As described above, in the mobile communication system, the location registration of the mobile terminal in the public network is indispensable.

[0003] The simplified portable telephone is configured so that the location can be registered in each of a public network and a private network. By connecting a base unit to the public network, a private network can be constructed even in a general home.

[0004]

A user of a mobile terminal manually specifies whether to register a mobile terminal such as a portable telephone in a public network or a private network. When switching the location registration from the public network to the private network, in order to have the incoming call transferred from the public network to the private network,
It is necessary to notify the public network of the private network whose location has been registered, and the user of the mobile terminal has manually notified this notification. Further, if the user of the mobile terminal has registered a contract with a plurality of private networks and there are a plurality of private networks for which the mobile terminal can perform location registration, the above-described manual operation is performed every time the private network for location registration is changed. Notification is required, and the manual operation of these location registrations is a burden on the user.

If the user of the mobile terminal forgets the above notification, the public network does not transfer the incoming call to the mobile terminal to the private network. Could not communicate with caller.

SUMMARY OF THE INVENTION The present invention solves such a conventional problem. A mobile communication system capable of registering a mobile terminal in one of a public network and one or more private networks without manual operation. The purpose is to provide a system.

[0007]

In order to achieve the above object, a mobile communication system according to the present invention comprises a public network, one or more private networks connected to the public network, and one of the above networks. In a mobile communication system having a mobile terminal that performs location registration and a base station of a location-registered network and a mobile terminal that performs outgoing / incoming call communication, the mobile terminal stores in advance a location registration network list indicating a priority of a network to be location-registered. By observing the reception power of the transmission signal from each base station of each network, a communicable base station is recognized, and the priority order of the position registration network list in the network to which the communicable base station belongs. Is registered in the top-level network, and when the base station of the network whose priority order in the location registration network list is higher than that of the network whose location is currently being registered becomes communicable, a new location is registered in this network. Location registration of the network that had been registered up to Mobile communication system, characterized by canceling.

According to a second aspect of the present invention, in the mobile communication system, the priorities of the networks for which the mobile terminals register their positions are arranged in order from the network having the lowest network usage fee during communication. Things.

According to a third aspect of the present invention, in each of the mobile communication systems, each of the networks is provided with a network identifier indicating its own network in the transmission signal. Recognizing which of the above networks is based on the network identifier, and when newly registering a position in a private network without registering a position in any of the networks, the position registration in the private network is determined by the private network. Notify to the public network through, and when the network for new location registration is a private network and the network for location registration cancellation is the public network, notify the public network of the newly registered private network to the public network, If both the network to be newly registered and the network to be unregistered are private networks, the newly registered private network is notified to the public network via the unregistered private network, and the new location is registered. A network to cancel location registration without registration is public If it is a network, notify the public network that no new location registration will be performed.If the network whose location is to be released without new location registration is a private network, location registration will not be performed. Is notified to the public network through this private network, the public network has a location registration database that stores location registration data indicating to which network the mobile terminal is registered, When the mobile terminal updates the location registration and location registration to the public network, and updates the content of the location registration base in accordance with the notification from the mobile terminal and receives an incoming call request for the mobile terminal, the mobile terminal refers to the location registration data. The mobile terminal calls the mobile terminal if the mobile terminal is registered in the public network, and transfers the incoming call request to the private network if the mobile terminal is registered in the private network. It is intended to.

According to a fourth aspect of the present invention, in the mobile communication system, the public network includes public network location registration data indicating whether or not the mobile terminal has registered a location in the public network, and a call request to the mobile terminal. A location registration database for storing a private network incoming call transfer list indicating a transfer order to the private network,
The mobile terminal updates the public network location registration data in accordance with location registration or location registration cancellation to the public network by the mobile terminal, and upon receiving an incoming call request for the mobile terminal, refers to the public network location registration data, and the mobile terminal If the mobile terminal is registered in the public network, the mobile terminal is called.If the mobile terminal is not registered in the public network, the incoming call request is sequentially transferred to the private network according to the incoming call transfer order. It is a feature.

The mobile communication system according to claim 5, wherein the private network includes one or more private networks belonging to a first group and a second private network.
The mobile terminal comprises one or more private networks belonging to a group, each of the networks having a network identifier indicating its own network in the transmission signal, and The network identifier is recognized by the network identifier, and when the location is newly registered in the private network of the first group without performing the location registration in any of the networks, the fact that the location has been registered in the private network is determined by this If the public network notified to the public network via the private network and the new location registration network is the first group of private networks, and the location registration canceling network is the public network, the newly registered private network is registered by the public. If the network to be newly registered is not a public network and the network to be unregistered is a private network belonging to the first group, the private network shall be deregistered. The public network is notified to the public network via the network. If the network whose location registration is to be canceled is the private network of the second group, the public network is notified of the fact that the location has been registered in this private network via the newly registered private network, If the network whose location registration is to be canceled without location registration is a public network, the public network is notified that no new location registration is to be performed. If this is a private network, the registration of this private network has been canceled without registering a new location.
The public network is notified via the private network, and the public network is provided with location registration data indicating which of the public network and the private network of the first group the location of the mobile terminal is registered with; A location registration database for storing a private network incoming call transfer list indicating a transfer order of a second group of incoming requests to the private network to the private network, wherein the mobile terminal performs location registration and location registration cancellation on the public network; Update the contents of the location registration data according to the notification from the mobile terminal, and when receiving a call request to the mobile terminal, refer to the location registration data, if the mobile terminal has been registered in the public network The mobile terminal is called, and if the mobile terminal has been registered in the first group of private networks, the incoming call request is transferred to the private network, and the mobile terminal is either a public network or a first group of private networks. Also rank If not registered, according to the called transfer order of the called request, it is characterized in that sequentially transferred to the second group of private networks.

According to a sixth aspect of the present invention, in the mobile communication system according to the fourth or fifth aspect, the public network monitors the frequency of outgoing / incoming call communication between the private network in the private network incoming call transfer list and the mobile terminal. The mobile terminal is characterized in that the incoming call transfer order of the private network incoming call transfer list is sequentially transferred from the private network in which the mobile terminal frequently performs outgoing / incoming call communication.

Therefore, according to the mobile communication system of the present invention, the user of the mobile terminal communicates using either the public network or the private network without performing the switching operation of the network for registering the location of the mobile terminal. can do.

Further, according to the mobile communication system of the second aspect, the user of the mobile terminal does not need to perform the switching operation of the network for registering the location of the mobile terminal, and the communication fee of either the public network or the private network is reduced. Communication can be performed using the lowest-priced network.

According to the mobile communication system of the third aspect, the private network is a public network network (common channel signaling digital network) to which a new control signal can be added in addition to a predetermined protocol. ), It is possible to transfer the incoming call to the mobile terminal without fail, and when there are multiple private networks that can be registered,
Incoming calls can be forwarded with minimal PSTN traffic.

According to the mobile communication system of the fourth or sixth aspect, the present invention is applied to a case where the private network is connected to a public network line (telephone network) to which a new control signal cannot be added. Thus, the incoming call can be transferred to the mobile terminal without fail, and the incoming call can be transferred with the minimum public network line traffic volume even when there are a plurality of private networks whose location can be registered.

According to the mobile communication system according to the fifth or sixth aspect, a private network (corresponding to the first group of private networks) connected to a public network line network to which a new control signal can be added. ) And a private network (corresponding to the private network of the second group) connected to a public network line to which a new control signal cannot be added. In addition, even when there are a plurality of private networks whose location can be registered, an incoming call can be transferred with a minimum public network line traffic amount.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

First Embodiment Here, it is assumed that a private network in which a mobile terminal can perform location registration is connected to a digital network of a public network. The protocol in the digital network is more flexible than the telephone network, and a new control signal can be added in addition to a predetermined protocol.

FIG. 1 is a diagram showing an example of a system configuration of a mobile communication system according to a first embodiment of the present invention. FIG.
Has a public network 1, private networks 2 and 3, and a mobile terminal 4.

The public network 1 includes a digital circuit network 11, a network control system 12 for controlling and controlling the public network 1, a location registration database management system (hereinafter referred to as location registration DBMS) 13, a location registration database 14, A public network base station 15 connected to the digital circuit network 11;

The private network 2 is connected to the digital circuit network 11 and has a network control device 21 for controlling the private network 2 in an integrated manner.
A private network base station 22 connected to the network controller 21; Similarly, the private network 3 is connected to the digital circuit network 11 and has a network control device 31 for controlling the private network 3 and base stations 32 and 33 connected to the network control device 31, respectively. The network controllers 21 and 31 are, for example, PB
X.

The mobile terminal 4 wirelessly communicates with the base stations of the public network 1, the private networks 2 and 3, and stores in advance a location registration network list indicating the priority of the network to be registered. In accordance with the above, the location is registered in any of the above-mentioned networks, and outgoing / incoming / outgoing call communication is performed with a base station of the registered network. Here, it is assumed that the priorities in the location registration network list are in order from the network having the lowest communication fee. This mobile terminal 4
For example, a simple mobile phone.

Public network base station 15 and private network base station 2
The transmission signals from 1, 31 include a network identifier indicating the network to which the base station belongs.

The digital network 11 is a common channel signaling system which does not have a restriction like a telephone network in exchanging control signals with a private terminal connected thereto and a mobile terminal 4 which performs wireless communication via a public network base station 15. Line.

FIG. 1 is a schematic diagram for explaining the first embodiment of the present invention. Generally, the public network 1 covers a wide area as a communicable area. The communicable area is divided into a plurality of communication areas.
Therefore, FIG. 1 shows only one public network base station,
Generally, a plurality of public network base stations are arranged in each communication area. FIG. 1 shows two private networks connected to the digital network 11, but a large number of private networks generally exist. Furthermore, although only one mobile terminal is shown in FIG. 1, generally, there are a plurality of mobile terminals.

The location registration database 14 stores the mobile terminal 4
Stores the location registration data indicating to which network the location registration is performed.
It is managed and updated by the BMS 13. Since this location registration data is in units of mobile terminals, when there are a plurality of mobile terminals, location registration data for each mobile terminal exists in the location registration database 14.

FIG. 2 is a diagram showing an example of the configuration of the location registration data of the mobile terminal 4 in the location registration database 14.

In the location registration data shown in FIG. 2, the communication area of the public network 1 (public network communication areas (1) to (m), where m is a positive integer) is provided in the public network communication area / private network column 101. And a private network (private networks (1) to (n), where n is a positive integer) to which the mobile terminal 4 can perform location registration, and the location registration flag column 102 stores each public network communication area and Location registration flags respectively corresponding to the private networks are stored. This location registration flag indicates “1” when the mobile terminal 4 is performing location registration in the corresponding communication area or private network.
It becomes "0" when the position is not registered. Therefore, when the mobile terminal 4 has not registered in the public network 1 or in any of the private networks whose location can be registered, the value is all "0", and the mobile terminal 4 performs location registration in the public network 1 or any of the private networks. In this case, one of them becomes "1" and the two are not simultaneously held at "1". FIG.
Shows the state of the location registration flag when the mobile terminal 4 is performing location registration in the private network (1). Here, the private network to which the mobile terminal 4 can perform position registration specifically refers to a private network to which the user of the mobile terminal 4 has previously registered a contract.

A procedure for registering the location of the mobile terminal 4 and a procedure for calling the mobile terminal 4 in response to an incoming call request received by the public network 1 according to the first embodiment of the present invention will be described below. Note that the procedure for making a call from the mobile terminal 4 is the same as that in the related art, and will not be described.

First, the power switch of the mobile terminal 4 is turned on.
The following describes an initial location registration process executed when the location is registered or when the location is not registered in any network. FIG. 3 is a flowchart showing the procedure of the initial position registration process.

In FIG. 3, when the power switch of the mobile terminal 4 is turned on by a user (step M1), the mobile terminal 4 receives transmission signals from each public network base station and private network base station. Since the received signal includes a signal from a base station of a private network for which the mobile terminal 4 cannot register its position (the user has not registered for a contract), the received signal is based on the network identifier included in the received signal. Then, signals from base stations of a network (including the public network 1) capable of registering positions are selected and held, and the reception power of these signals is observed (step M3). Next, it is determined whether there is a base station whose received power is at a level suitable for communication (hereinafter, referred to as an initially connectable base station) (step M4).

If there is no initial connectable base station in step M4, the mobile terminal 4 notifies the user on the display or the like that he is out of the communication area (step M4).
5) Return to step M3.

If there is an initially connectable base station in step M4, the mobile terminal 4 connects the base station of the network having the highest priority in the location registration network list from the networks to which the base station belongs. Select as a candidate base station (step M
6). That is, the base station of the network with the lowest communication fee among the networks that can communicate is selected. Next, a location registration message is transmitted to the connection candidate base station to notify the network to which the connection candidate base station belongs that the location registration is to be performed (step M).
7). At this time, if the network to which the connection candidate base station belongs is a private network, a message to the public network indicating that a new location is to be registered in the private network is added to the location registration message, and the message to the public network is added. Is transferred from the private network to the public network 1 to notify the public network 1 of the newly registered private network.

In step M7, if the connection candidate base station is a public network base station, the public network 1 receives the above-mentioned location registration message by the connection candidate base station (step N1), and sends this location registration message. Location registration DB via digital network 11 and network control system 12
Transfer to the MS 13 (step N2), and the location registration DBMS
13 is the mobile terminal 4 in the location registration database 14.
Is updated (step N3). That is, FIG. 2 where the all position registration flag was “0” before this.
In the location registration data of the mobile terminal 4, the location registration flag of the communication area to which the public network base station (connection candidate base station) that received the above message belongs is changed from “0” to “1” to locate the mobile terminal 4. register. When the location registration is completed, the public network 1 transmits a location registration completion message to the mobile terminal 4 (step N4).

In step M9, if the connection candidate base station is a private network base station, the private network (private network 2 or 3) to which the private network base station belongs transmits the above-mentioned location registration message to the connection candidate base station. The mobile station 4 is received by the base station (step L1), the location of the mobile terminal 4 is registered by the private network controller (step L2), and the message to the public network added to the location registration message is transferred to the public network 1 (step L3) ), And transmits a location registration completion message to the mobile terminal 4 (step L4). The public network 1 receives the message addressed to the own network transferred from the private network (step N).
5) and transfer to the location registration DBMS 13 (step N)
6) Update the location registration data of the mobile terminal 4 in the location registration database 14 (step N7). That is, FIG. 2 where the all position registration flag was “0” before this.
In the location registration data, the flag of the private network to which the connection candidate base station belongs is changed from "0" to "1", and the private network to which the mobile terminal 4 is connected is stored.

The mobile terminal 4 determines whether a location registration completion message has been received within a predetermined time after transmitting the location registration message (step M8).

If the location registration completion message cannot be received in step M8, the connection to the connection candidate base station is abandoned, and whether or not there is another base station that can be initially connected is stored in step M3. The determination is made based on the signal (step M9). If there is no other initially connectable base station in step M9, the process proceeds to step M5. If there is another base station that can be initially connected in step M9, the connection candidate base station is changed (step M10), and
Return to 7. Here, as the new connection candidate base station, a base station belonging to a network having the second priority in the location registration network list among the networks to which the initially connectable base station belongs is selected.

If the location registration completion message is received in step M8, the initial location registration processing of FIG. 3 is terminated, and the processing shifts to location registration switching processing (step M1).
1). Thereby, the location of the mobile terminal 4 is registered in the network of the connection candidate base station, and the mobile terminal 4 connects to the connection candidate base station. Here, the base station to which the mobile terminal 4 is connected (the connected base station) means that the mobile terminal 4 monitors an incoming call and makes a call in response to a user's call operation (dial operation). Indicates the base station making the call.

Next, a description will be given of a location registration switching process between the public network 1 and the private network. FIG. 4 is a flowchart showing the procedure of the location registration switching process between the public network 1 and the private network.

Referring to FIG. 4, description will first be made of a case where a connection base station is switched from a public network to a private network. When the initial position registration processing shown in FIG. 3 is completed (step M20),
The mobile terminal 4 receives transmission signals from the connected public network base station and each base station belonging to the private network whose position can be registered, and observes the received power of each (step M2).
1) Among the base stations belonging to the private network whose priority order of the location registration network list is higher than the public network whose location is currently being registered,
A base station whose received power is at a level suitable for communication (hereinafter referred to as
It is determined whether or not there is a connectable base station (step M22). In step M21, each received signal is held.

If there is no connectable base station in step M22, it is determined whether or not the received power from the base station belonging to the network whose position is currently registered is at a level suitable for communication (step M23). If the level is not suitable for the position registration, the processing shifts to the position registration release processing (step M2).
4) If the received power is at a level suitable for communication, the process returns to step M21.

If there is a connectable base station in step M22, the base station belonging to the network having the highest priority in the location registration network list is selected as a connection candidate base station (step M25). A location registration message is transmitted to the connection candidate base station (step M26), and a notification that the location registration is to be made to the private network (private network 6 or 7) to which the connection candidate base station belongs.

The private network receives the location registration message by the connection candidate base station (step L11), registers the location of the mobile terminal 4 (step L12), and transmits a location registration completion message to the mobile terminal 4 (step L12). L1
3).

The mobile terminal 4 determines whether a location registration completion message has been received within a predetermined time after transmitting the location registration message (step M27).

If the location registration completion message cannot be received in step M27, the connection switching to the connection candidate base station is abandoned, and it is determined whether there is another connectable base station (step M28). If there is no other connectable base station in step M28, the process proceeds to step M23. If there is another connectable base station in step M28, the connection candidate base station is changed (step M2).
9) Return to step M26.

If the location registration completion message is received in step M29, a location registration release message is transmitted to the connected public network base station (step M3).
0), the public network 1 is notified that location registration is canceled. This location registration release message includes information indicating the private network whose location has been newly registered.

The public network 1 receives the location registration release message by the public network base station connected to the mobile terminal 4 (step N11), and transfers this location registration release message to the location registration DBMS 13 (step N12). The location registration DBMS 13 updates the location registration database 14 according to the contents (step N13). That is,
In the location registration data of the mobile terminal 4 in FIG. 2, the location registration flag of the communication area in which the location of the mobile terminal 4 has been registered is changed from “1” to “0” to cancel the location registration of the mobile terminal 4 in the public network 1. Then, the location registration flag of the private network newly registered by the mobile terminal 4 is changed from “0” to “1”, and the private network newly registered by the mobile terminal 4 is stored. Thereafter, when receiving the incoming call to the mobile terminal 4, the public network 1 transfers the incoming call to the private network with the location registration flag "1". Next, the mobile station 4 transmits a location registration release message (step N14).

The mobile terminal 4 receives the location registration release message from the public network 1 (step M31), and
Return to 21. Thereby, the location registration network of the mobile terminal 4 is switched from the public network to the private network, and the connected base station is switched from the public network base station to the private network base station.

Next, a case where the location registration is switched from the private network to the public network will be described. Steps M20 to M31 in the mobile terminal 4 are basically the same as the case where the location registration is switched from the public network to the private network, but the following points must be noted. The base station that becomes the connectable base station in step M22 is a public network base station (the case where the connectable base station belongs to another private network will be described later). In Step M26, a location registration message is transmitted to the public network base station which is a connection candidate base station,
The public network 1 is notified of location registration. Step M
At 32, a location registration release message is transmitted to the private network base station, which is the connected base station, to notify the private network that location registration is to be released.

The public network 1 receives the above-mentioned location registration message by the public network base station which is a connection candidate base station (step N21), and receives this location registration message in the location registration D.
Transfer to the BMS 13 (step N22), location registration DB
The MS 13 sends the location registration database 1 according to the content.
4 is updated (step N23). That is, in the location registration data of the mobile terminal 4 of FIG. 2, the flag of the communication area to which the connection candidate base station belongs is changed from “0” to “1” to register the location of the mobile terminal 4, and the mobile terminal releases the location registration. The position registration flag of the private network is changed from "1" to "0".
Thereafter, when the incoming call to the mobile terminal 4 is received, the public network 1 calls the mobile terminal 4 from the communication area of the location registration flag “1” without transferring to the private network. Next, a location registration completion message is transmitted to the mobile terminal 4 (step N2).
4).

The private network receives the above location registration release message by the private network base station connected to the mobile terminal 4 (step L21), and releases the location registration of the mobile terminal 4 by the private network controller (step L21). L22), a location registration release completion message is transmitted to the mobile terminal 4 (step L23).

When the mobile terminal 4 completes step M31, the location registration network of the mobile terminal 4 is switched from the private network to the public network 1, and the connected base station is switched from the private network base station to the public network base station.

Next, a description will be given of the process of switching the location registration from a private network to another private network. FIG. 5 is a flowchart showing a procedure of a location registration switching process from a private network to another private network. Steps M20 to M31 of the mobile terminal 4 in FIG. 5 are basically the same as steps M20 to M31 of the mobile terminal 4 in FIG. 4, but the following points must be noted. It is assumed that all the base stations that can be connected in step M22 belong to a private network different from the private network of the currently connected base station. The location registration message transmitted to the connection candidate base station in step M26 does not include information indicating the private network whose location registration is to be released.
Further, the location registration release message transmitted to the connected base station in step M30 includes a message addressed to the public network indicating a newly registered private network. FIG.
Step L11 of the private network of the location registration switching destination in
L13 to L13 are steps L11 to L of the private network in FIG.
Same as 13.

In FIG. 5, when mobile station 4 receives a location registration completion message from a private network to which a connection candidate base station belongs (a private network to which a location registration is switched) and transmits a location registration release message (step). M27, M
30), the private network to which the connected base station belongs (the private network from which the location registration is switched) receives the location registration release message by the private network base station connected to the mobile terminal 4 (step L'31). The private network controller releases the location registration of the mobile terminal 4 (step L'32), transfers the message to the public network added to the received location release registration message to the public network 1 (step L '). 3
3), a location registration release completion message is transmitted to the mobile terminal 4 (step L'34).

The public network 1 receives the transferred message addressed to the public network (step N31), and transfers the message to the location registration DBMS 13 (step N32). Is updated (step N33). That is, in the location registration data of the mobile terminal 4 in FIG. 2, the location registration flag of the private network newly registered by the mobile terminal 4 is changed from “0” to “1”, and the new location registration private network is stored. The mobile terminal 4 changes the flag of the private network from which the location registration has been canceled from “1” to “0”. Thereafter, the public network 1
When receiving the incoming call to the mobile terminal 4, the mobile terminal 4 transfers the call to the newly registered private network.

When the mobile terminal 4 completes step M31, the location registration private network of the mobile terminal 4 is switched, and the base station to be connected is shifted from the base station of the location registration switching source private network to the location registration switching destination private network. Switch to network base station.

Next, in the location registration switching process, there is no base station whose received power is at the appropriate communication level (in step M23 of FIG. 4 or FIG. 5, the received power of the base station of the network whose location is being registered is at the appropriate communication level). The location registration release process executed when the location registration switching process is interrupted or when the power switch of the mobile terminal is turned off while connected to the base station will be described. In the mobile terminal 4, even if the power switch provided on the operation panel or the like is turned off by the user, power is supplied to each circuit for executing the following processing at least until the processing is completed. And

FIG. 6 is a flowchart showing the procedure of the location registration canceling process. In FIG. 6, when the location registration switching process is interrupted (step M41) or when the power switch of the mobile terminal 4 is turned off by the user (step M42), the mobile terminal 4 moves to the connected base station. Send a registration release message (step M4)
3). The location registration cancellation message includes information indicating that the mobile terminal 4 cancels registration without newly performing location registration. When the network whose location registration is to be released is a private network, the above information is added to the location registration release message as a message addressed to the public network.

In step M43, if the connected base station is a public network base station, the public network receives the location registration message (step N41), and transmits this location registration message to the digital network 11 and The data is transferred to the location registration DBMS 13 via the network control system 12 (step N42), and the location registration DBMS 13 updates the location registration database 14 according to the content (step N43). That is, in the location registration data of the mobile terminal 4 in FIG. 2, the flag of the communication area to which the public network base station to which the mobile terminal 4 is connected belongs is changed from “1” to “0”, and all the flags are set to “0”. The location registration of the mobile terminal 4 is released, and the fact that the location of the mobile terminal 4 is not registered in any network is stored. Next, a location registration completion message is transmitted to the mobile terminal 4 (step N44).

If the connected base station is a private network base station in step M43, the private network receives the location registration release message (step L41),
The location registration of the mobile terminal 4 is released by the private network controller (step L42), the message to the public network added to the received location registration release message is transferred to the public network 1 (step L43), and the location registration is performed. A release completion message is transmitted to the mobile terminal 4 (step L44).

The public network 1 receives the message addressed to the public network transferred from the private network (step N45), and the location registration D
The data is transferred to the BMS 13 (step N46), and the location registration database 14 is updated (step N47). That is, in the location registration data of the mobile terminal 4 in FIG. 2, all the flags are changed to "0" to store that the mobile terminal 4 has not registered in any network.

[0062] The mobile terminal 4 receives the location registration release completion message (step M44). As a result, the mobile terminal 4 is in a state where it has not registered in any network.
Next, it is determined whether the power switch is ON or OFF (step M45). If the power switch is OFF, the operation is stopped (step M46). If it is ON, the user is notified on the display or the like that he is out of the communication area (step M47), and the process proceeds to the initial position registration process (proceed to step M2 in FIG. 3, step M48).

Finally, an incoming call processing when the public network receives an incoming request for a mobile terminal will be described. FIG. 7 is a flowchart showing the procedure of the incoming call processing. In FIG. 7, when the public network receives an incoming call request to a mobile terminal (step N51), the location registration DBMS 13
The mobile terminal 4 searches the location registration data of the mobile terminal 4 in the location registration database 14 by using
Alternatively, it is determined whether or not the location is registered in any of the private networks (step N52). That is, it is checked whether or not there is a communication area or a private network whose location registration flag is "1" in the location registration data of the mobile terminal 4.

If the location of the mobile terminal 4 has not been registered in step N52 (if all the location registration flags of the location registration data are "0"), the caller is asked "Is it outside the communication area?" , The power is off "and the like (step N53).

If the location of the mobile terminal 4 has been registered in step N52 (if the location registration data has a location registration flag of "1"), the network in which the location of the mobile terminal 4 is registered is registered. Is determined to be a public network 1 or a private network (step N54). If the location is registered in the public network 1, a call is called from the public network base station in the communication area in which the location is registered to the mobile terminal 4 (step N55). If the location is registered in the private network, the incoming call request is transferred to the private network (step N56).

The private network with which the mobile terminal 4 has registered the location is
The incoming call request transferred from the public network is received (step L5).
1) The mobile terminal 4 calls the mobile terminal 4 from the connected base station (step L52).

The mobile terminal 4 receives a call from the connected base station (step M51), and if the user performs a response operation, a communication path is established between the mobile terminal 4 and the caller by a predetermined protocol.

As described above, according to the first embodiment,
The user of the mobile terminal 4 can communicate using the network with the lowest communication fee without performing the switching operation of the network for registering the location of the mobile terminal 4.

In addition, the public network 1 recognizes the private network in which the mobile terminal 4 is performing location registration, and when receiving a call to the mobile terminal 4, transfers the incoming call only to the private network. The incoming call can be reliably transferred to the mobile terminal 4 with the public network line traffic volume.

If the fee charged from the public network 1 is determined according to the number of private networks registered in the location registration database, a clear billing system can be constructed.

Second Embodiment Here, it is assumed that a private network in which a mobile terminal can register its location is connected to a telephone network of a public network. The major difference from the first embodiment is that the protocol in the telephone network is strictly defined.
Public network procedures are restricted. That is, messages between the private network and the public network (control signals other than the prescribed protocol)
In particular, when the mobile terminal switches the connection of the base station from the private network to another private network, the public network cannot uniquely determine the position of the mobile terminal. Therefore, regardless of whether or not the mobile terminal has registered the location, the incoming call is forwarded to the private network, but if there are multiple private networks that can be registered, the public network sets each private network according to the preset priority. Incoming call transfer to the network.

FIG. 8 is a diagram showing an example of a system configuration of a mobile communication system according to the second embodiment of the present invention. This mobile communication system comprises a public network 1 and private networks 6 and 7.
And the mobile terminal 4.

The public network 1 includes a digital network 11, a telephone network 16, a network control system 12, a location registration DB
It has an MS 17, a location registration database 18, and a public network base station 15 connected to the digital network 11.

The private network 6 has a private network base station 61 connected to the telephone network 16. Similarly, private network 7 has a private network base station 71 that connects to telephone network 16. The private network base station is, for example, a base unit of a home cordless telephone or a base unit of a business system cordless telephone.

The mobile terminal 4 wirelessly communicates with the public network 1 and the private networks 6 and 7, and stores in advance a location registration network list indicating the priorities of the networks to be registered, and according to the location registration network list, The location is registered in one of the networks, and outgoing / incoming call communication is performed with a base station of the registered network. Here, it is assumed that the priorities in the location registration network list are in order from the network having the lowest communication fee. The mobile terminal 4 is, for example, a simple mobile phone.

Network control system 12, digital network 1
1 and the public network base station 15 are the same as those shown in FIG. Public network base station 15 and private network base stations 61 and 7
1 includes a network identifier for distinguishing between a network in which the mobile terminal 4 can perform position registration and a private network in which the mobile terminal 4 cannot perform position registration.

FIG. 8 is a schematic diagram for explaining the second embodiment of the present invention. Generally, the public network 1 covers a wide area as a communicable area. The communicable area is divided into a plurality of communication areas.
Therefore, although only one public network base station is shown in FIG.
Generally, a plurality of public network base stations connected to the digital network 11 are arranged in each communication area. FIG. 8 shows two private networks connected to the telephone network 16.
As described above, there are generally many private networks connected to the telephone network 16. Further, FIG. 8 shows only one mobile terminal, but generally there are a plurality of mobile terminals.

The location registration database 18 stores the mobile terminal 4
Network location registration data indicating which communication area of the public network is registered in the public network, and an incoming call request to a private network in which the mobile terminal 4 can perform location registration when receiving an incoming call request for the mobile terminal 4 It stores a private network incoming call transfer list indicating the transfer order. The public network position registration data and the private network incoming call transfer list are managed and updated by the position registration DBMS 17. Since the public network location registration data and the private network incoming call transfer list are in units of mobile terminals, if there are a plurality of mobile terminals, the public network location registration data and the private network incoming call transfer list for each mobile terminal are provided. Exist in the location registration database 17.

FIG. 9 is a diagram showing an example of the configuration of the public network location registration data and the private network incoming call transfer list in the location registration database 18, where (a) shows the configuration of the public network location registration data and (b) Shows the configuration of the private network incoming call forwarding list.

In FIG. 9A, a communication area of the public network 1 (public network communication areas (1) to (m), where m is a positive integer) is stored in a public network communication area column 111. ,
The position registration flag column 112 stores a position registration flag corresponding to each public network communication area. This location registration flag indicates that the mobile terminal 4 is located in the corresponding communication area.
Becomes "1" when the location is registered, and becomes "0" when the location is not registered. Therefore, when the mobile terminal 4 has not registered in the public network 1, the value is all “0”. At this time, whether the mobile terminal 4 has registered in one of the private networks, and in which private network, The public network 1 does not recognize whether the user is in the public network.

In FIG. 9B, a private network in which the location of the mobile terminal 4 can be registered is registered in the call transfer destination column 113, and the call transfer destination 11 is registered in the transfer order column 114.
The transfer order of the incoming call request to the private network 3 is stored.
In the case of FIG. 9B, the public network 1 receives an incoming call request for the mobile terminal 4, and if the mobile terminal 4 has not been registered in the public network 1, first the incoming call to the private network (2). Forward. If there is no response after a predetermined time, then the private network (n)
Transfer to Private network (3) ~
The data is transferred to the private network (n-1) and finally to the private network (1). This transfer order may be, for example, specified by the user of the mobile terminal 4 or the frequency of outgoing / incoming calls between each private network of the incoming call destination 113 and the mobile terminal 4 is observed, and The order is such that data is transferred sequentially from a private network that has a high communication frequency.

Hereinafter, a procedure for registering the location of mobile terminal 4 and a procedure for calling mobile terminal 4 in response to an incoming call request received by public network 1 according to the second embodiment of the present invention will be described. Note that the procedure for making a call from the mobile terminal 4 is the same as that in the related art, and will not be described.

First, the power switch of the mobile terminal 4 is turned on.
Or an initial location registration process executed when the location is not registered in any network. FIG. 10 is a flowchart showing the procedure of the initial position registration process. The procedure shown in FIG. 10 is obtained by removing steps N5 to N7 in the public network and step L3 in the private network in FIG. 3 (the procedure of the initial location registration processing of the first embodiment).

In FIG. 10, when the connection candidate base station is a public network base station in step M7, the public network 1 receives the location registration message from the mobile terminal 4 by the connection candidate base station (step N1). The location registration message is transferred to the location registration DBMS 17 via the telephone line network 16 and the network control system 12 (step N2), and the location registration DBMS 17 updates the location registration database 18 according to the contents (step N3). That is, in the location registration data of the mobile terminal 4 in FIG. 9, the flag of the communication area to which the public network base station as the candidate base station belongs is set to “
The position of the mobile terminal 4 is changed from “0” to “1.” When the position registration is completed, the public network 1 transmits a position registration completion message to the mobile terminal 4 (step N4).

If the connection candidate base station is a private network base station in step M7, the private network receives a location registration message from the mobile terminal by the connection candidate base station (step L1), and the mobile terminal 4 Register location (Step L
3) Send a location registration completion message to the mobile terminal 4 (step L4). At this time, the received location registration message is not transferred to the public network, so that the location registration data of the mobile terminal 4 in FIG. 9 does not change.

If the location registration completion message can be received in step M8, the initial location registration processing of FIG. 10 is terminated, and the processing shifts to location registration switching processing (step M1).
1). Thereby, the location of the mobile terminal 4 is registered in the network of the connection candidate base station, and the mobile terminal 4 connects to the connection candidate base station.

Next, a description will be given of a location registration switching process between the public network and the private network. The location registration switching process between the public network and the private network is basically the same as in the first embodiment (the procedure shown in FIG. 4). However, the following points are different. In switching location registration from public network to private network,
The location registration release message transmitted from the mobile terminal in step M32 does not include information indicating the private network to which the location registration is switched. Therefore, the public network 1 performs step N1.
In FIG. 3, the position registration flag of the public network communication area where the position of the mobile terminal 4 has been registered is changed from "1" to "0" in the public network position registration data of the mobile terminal 4 in FIG. 4, the mobile terminal 4 does not recognize the newly registered private network. Further, in the location registration switching from the private network to the public network, the public network 1 sets the flag of the public network communication area for location registration of the mobile terminal 4 to "0" in the location registration data of the mobile terminal 4 in step N23 in FIG. Just change from "1" to "1".

By the above procedure, the location registration network of the mobile terminal 4 is switched from the public network to the private network or from the private network to the public network.

Next, a description will be given of the processing for switching the location registration from a private network to another private network. FIG. 11 is a flowchart showing the procedure of the location registration switching process between private networks. In the procedure shown in FIG. 11, in FIG. 5 (the procedure of the location registration switching process between private networks in the first embodiment), step L'32 in the private network of the switching source and steps N31 to N33 in the public network are deleted. It was done. Steps M20-M in the mobile terminal of FIG.
31 is basically the same as steps M20 to M31 in FIG. 5, but differs in the following points. Step M32 in FIG.
The location registration release message transmitted from the mobile terminal does not include a message addressed to the public network indicating the private network to which the location registration is switched.

In FIG. 11, the private network at the switching source is
The location registration message is received from the mobile terminal 4 (step L'31), the location registration of the mobile terminal 4 is released (step L'32), and a location registration release completion message is transmitted to the mobile terminal 4 (step L '). '34). At this time, the public network is not involved at all, and therefore the location registration data of the mobile terminal 4 in FIG. 9 does not change.

With the above procedure, the location registration private network of the mobile terminal 4 is switched, and the base station to which the mobile terminal 4 connects is
Switching from the private network base station at the switching source to the private network base station at the switching destination.

Next, in the location registration switching process, there is no base station whose received power is at the appropriate communication level (in step M23 of FIG. 4 or FIG. 11, the received power of the base station of the network whose location is being registered is reduced to the appropriate communication level). The location registration release process executed when the location registration switching process is interrupted or when the power switch of the mobile terminal is turned off while connected to the base station will be described. In the mobile terminal 4, even if the power switch provided on the operation panel or the like is turned off by the user, power is supplied to each circuit for executing the following processing at least until the processing is completed. And

FIG. 12 is a flowchart showing the procedure of the location registration canceling process. The procedure shown in FIG.
In the location registration canceling procedure of the embodiment, steps N45 to N47 in the public network and step L43 in the private network are deleted. FIG.
Steps M41 to M48 in the mobile terminal of FIG.
Are basically the same as steps M41 to M48, except for the following points. The location registration release message transmitted by the mobile terminal 4 in step M43 does not include information indicating that the mobile terminal 4 has not newly registered a location.

In step M43 of FIG. 12, if the connected base station is a public network base station, the public network 1
The location registration release message is received (step N4).
1) The location registration release message is sent to the location registration DBMS 17 via the telephone network 16 and the network control system 12.
(Step N42), and the location registration DBMS 17
Updates the location registration database 18 according to the contents (step N43). That is, the mobile terminal 4 in FIG.
In the location registration data, the flag of the communication area to which the public network base station to which the mobile terminal 4 is connected belongs is changed from “1” to “1”.
0 ”and set all flags of the public network location registration data to“
0 "to cancel the position registration of the mobile terminal 4.

If the connected base station is a private network base station in step M43, private network 1 receives the above-mentioned location registration release message (step L4).
1), the location registration of the mobile terminal 4 is released (step L4)
2), a location registration release completion message is transmitted to the mobile terminal 4 (step L44). At this time, the public network 1 does not participate in the procedure between the private network and the mobile terminal 4 at all.

Finally, the incoming call processing when the public network receives an incoming call request to a mobile terminal will be described. FIG. 13 is a flowchart showing the procedure of the incoming call processing. In FIG. 13, when the public network 1 receives an incoming call request to the mobile terminal 4 (step N61), the location registration DB
The mobile terminal 4 of the location registration database 18 by the MS 17
It is determined whether or not the mobile terminal 4 is registered in the public network 1 by searching the public network location registration data (step N62). That is, it is checked whether or not there is a public network communication area in which the location registration flag is “1” in the public network location registration data of the mobile terminal 4.

If the mobile terminal 4 has been registered in the public network 1 in step N62 (the position registration flag is "1").
(If there is a public network communication area), the mobile terminal 4 is called from the public network base station in the public network communication area where the location of the mobile terminal 4 is registered (step N63). Mobile terminal 4
Receives the above call (step M61), and performs a response operation by the user (step M6).
2) A response signal is transmitted to the public network 1 (step M63). The public network 1 determines whether or not a response signal has been received within a predetermined time from the start of the call of the mobile terminal 4 (step N64). A call refusal message is returned (step N65). If a response signal can be received, a communication path is established between the caller and the mobile terminal according to a predetermined protocol.

If the mobile terminal 4 has not been registered in the public network 1 in step N62, the call transfer private network is selected based on the private network call transfer list of the mobile terminal 4 in the location registration database 18. (Step N66). That is, the private network in the transfer order “1” of the private network list (FIG. 9)
In (b), the private network (2) is selected as the incoming call transfer private network. Next, an incoming call request is transferred to the incoming call transfer private network (step N67).

The incoming call transfer private network receives the incoming call request transferred from the public network 1 (step L61), and determines whether or not the mobile terminal 4 to which the incoming call request is registered in its own network (step L62). If the location is registered, the mobile terminal 4 is called (step L63). If the location is not registered, the incoming call request is ignored.

The mobile terminal 4 receives the call from the private network for incoming call transfer (step M61), and if a response operation is performed by the user (step M62), sends a response signal to the private network for call transfer. Transmit (step M63).
In this case, the incoming call transfer private network receives the response signal from the mobile terminal 4 (step L64), and sends this response signal to the public network 1
(Step L65).

The public network 1 determines whether a response signal has been received from the incoming call transfer private network within a predetermined time from the start of the call of the mobile terminal 4 (step N68). When a response signal is received, a communication path is established between the caller and the mobile terminal 4 according to a predetermined protocol.

If the response signal is not received in step N68, it is determined whether there is another private network to which the call is to be transferred based on the private network call transfer list in the location registration database 18. Step N69), if there is another private network to which the call is to be transferred, the private network is newly set as the call transfer private network (step N70).
Return to 67. That is, when the user of the mobile terminal 4 has contracted with a plurality of private networks and the private network incoming call forwarding list has a private network of the transfer order “2” (the private network (n) in FIG. 9B). Shall make the private network a new incoming call forwarding private network,
The incoming call transfer is transferred to the private call transfer private network. As described above, in steps N66 to N70, the incoming call request is sequentially transferred to each private network from the transfer order "1" to "n" in the private network incoming call transfer list in FIG. . If there is no other private network to which the call is to be transferred in step N69, the process proceeds to step N65.

As described above, according to the second embodiment,
The user of the mobile terminal 4 can communicate using the network with the lowest communication fee without performing the switching operation of the network for registering the location of the mobile terminal 4.

The public network 1 observes the frequency of outgoing / incoming calls between the mobile terminal 4 and the private network.
Since incoming calls are forwarded in order from the private network with the highest outgoing / incoming call communication frequency, incoming calls can be transferred to the mobile terminal 4 reliably with the minimum public network line traffic volume.

If the fee charged from the public network 1 is determined according to the number of private networks registered in the location registration database, a clear billing system can be constructed.

Third Embodiment In the present embodiment, it is assumed that private networks in which mobile terminals can be registered include those connected to a digital network and those connected to a telephone network. .

FIG. 14 is a diagram showing an example of a system configuration of a mobile communication system according to the third embodiment of the present invention. The mobile communication system includes a public network 1, private networks 3 and 6, and a mobile terminal 4.

The public network 1 includes a digital network 11, a telephone network 16, a network control system 12, a location registration DB
It has an MS 19, a location registration database 20, and a public network base station 15 connected to the digital network 11.

The private network 3 is connected to the digital network 11 and has the same configuration as the private network 3 in FIG. The private network 6 is connected to a telephone line network 16 and has the same configuration as the private network 6 in FIG. The private network control device 31 of the private network 3 is, for example, a PBX, and private network base stations 32 and 33.
Is, for example, a main unit of a business system cordless telephone. The private network base station 61 of the private network 6 is, for example, a base unit of a home cordless telephone. The mobile terminal 4 wirelessly communicates with the public network 1 and the private networks 3 and 6, and stores in advance a location registration network list indicating the priority of the network to be registered, and any one of the above networks according to the location registration network list. The location registration is performed, and outgoing / incoming call communication is performed with the base station of the location registered network. Here, it is assumed that the priorities in the location registration network list are in order from the network having the lowest communication fee. The mobile terminal 4 is, for example, a simple mobile phone.

FIG. 14 is a schematic diagram for explaining the third embodiment of the present invention. Generally, a plurality of communication areas connected to the digital network 11 are provided in each communication area of the public network. Public network base stations are arranged. There are a large number of private networks connected to the digital network 11 such as the private network 3 and a large number of private networks connected to the telephone network 16 such as the private network 6. Furthermore, there are a plurality of mobile terminals. In the following description, a private network connected to the digital network 11 is referred to as a first group of private networks, and a private network connected to the telephone network 16 is referred to as a second group of private networks.

The location registration database 20 stores the mobile terminal 4
Registration data indicating to which of the public network communication areas and the first group of private networks capable of location registration the location is registered or not registered, and an incoming call to the mobile terminal 4 Mobile terminal 4 when receiving the request
And a private network incoming call transfer list indicating a transfer order of incoming call requests to a second group of private networks capable of location registration,
The location registration data and the private network incoming call transfer list are managed and updated by the location registration DBMS 19. The location registration data and the private network incoming call transfer list are in units of mobile terminals.

FIGS. 15A and 15B are diagrams showing an example of the configuration of the location registration data and the private network call transfer list in the location registration database 20. FIG. 15A shows the configuration of the location registration data, and FIG. 3 shows the structure of a call transfer list. FIG.
The location registration data 5 (a) has the same configuration as the location registration data of FIG. 2 and the same configuration as the private network incoming call transfer list of FIG. 15 (b).

A procedure for registering the location of the mobile terminal 4 and a procedure for calling the mobile terminal 4 in response to an incoming call request received by the public network 1 according to the third embodiment of the present invention will be described below. Note that the procedure for making a call from the mobile terminal 4 is the same as that in the related art, and will not be described.

First, the power switch of the mobile terminal 4 is turned on.
Or an initial location registration process executed when the location is not registered in any network. As the procedure of the initial position registration processing, either the procedure of FIG. 3 (the procedure of the first embodiment) or the procedure of FIG. 10 (the procedure of the second embodiment) is used. That is, the mobile terminal 4 uses the procedure of FIG. 3 when the connection candidate base station belongs to the public network 1 or the private network of the first group, and uses the procedure of FIG. 3 when the connection candidate base station belongs to the private network of the second group. The procedure of FIG. 10 is used.

When the initial location registration process is performed according to the procedure shown in FIG. 3, the public network 1 uses the public network communication area or the first public location where the mobile terminal 4 has registered the location in the location registration data shown in FIG. One of the location registration flags of the private network of the group is changed from "0" to "1". When the initial location registration process is executed according to the procedure of FIG. 10, the public network 1 is not involved in this process, and all the location registration flags of the location registration data of FIG. is there.

Next, the location registration switching process between the public network and the first group of private networks is the same as the procedure of the first embodiment (the procedure of FIG. 4). The location registration switching process between the public network and the second group of private networks is the same as the procedure of the second embodiment (also the procedure of FIG. 4).

Next, the location registration switching process between the private network of the first group and another private network of the first group is the same as the procedure of the first embodiment (the procedure of FIG. 5). The location registration switching process between the private network of the second group and another private network of the second group is the same as the procedure of the second embodiment (the procedure of FIG. 11).

Next, a description will be given of a location registration switching process between the first group of private networks and the second group of private networks. FIG.
9 is a flowchart showing a procedure of a location registration switching process between a private network of the first group and a private network of the second group. FIG.
6, the procedure of the mobile terminal 4 is not shown.
Is performed in step M20 of FIG. 4, FIG. 5, or FIG.
Basically the same as M31. However, when switching from the private network of the second group to the private network of the first group, the location registration message from the mobile terminal 4 is accompanied by a message addressed to the public network indicating the private network for which the mobile terminal 4 is to perform new location registration. Have been. In switching from the private network of the first group to the private network of the second group, a location registration release message from the mobile terminal 4 is added with a message addressed to the public network indicating the private network whose mobile terminal 4 releases the location registration. ing.

Referring to FIG. 16, the procedure for switching the location registration from the second group private network to the first group private network will be described first.
When the first group of private networks receives the location registration message from the mobile terminal 4 (step L81), the private network registers the location of the mobile terminal 4 (step L82), and the public network message added to the received location registration message. Is transferred to the public network (step L83), and a location registration completion message is transmitted to the mobile terminal 4 (step L84).

The public network 1 receives the transferred public network message (step N81), transfers this message to the location registration DBMS 19 (step N82), and the location registration DBMS 19 according to the contents thereof. Is updated (step N83). That is, in the location registration data of the mobile terminal 4 in FIG. 15B, the flag of the private network of the first group newly registered by the mobile terminal 4 is changed from “0” to “1”.

When the private network of the second group receives the location registration release message from the mobile terminal 4 (step L'8).
1), the location registration of the mobile terminal 4 is released (step L'8)
2) Transmit a location registration completion message to the mobile terminal 4 (step L'83).

Next, the procedure for switching the location registration from the private network of the first group to the private network of the second group will be described. Upon receiving the location registration message from the mobile terminal 4 (step L'91), the private network of the second group registers the location of the mobile terminal 4 (step L'92) and transmits a location registration completion message to the mobile terminal 4. (Step L'93).

When the private network of the first group receives the location registration release message from the mobile terminal 4 (step L91),
The location registration of the mobile terminal 4 is canceled (step L92), and the message addressed to the public network added to the received location registration message is transferred to the public network (step L9).
3), a position registration release completion message is transmitted to the mobile terminal 4 (step L94).

The public network 1 receives the transferred public network message (step N91), transfers the message to the location registration DBMS 19 (step N92), and updates the location registration database 20 (step N9).
3). That is, in the location registration data of the mobile terminal 4 in FIG. 15A, the location registration flag of the private network of the first group whose location registration has been canceled by the mobile terminal 4 is changed from “1” to “0”.

As described above, the location registration network of the mobile terminal 4 is:
Switching from the first group of private networks to the second group of private networks or from the second group of private networks to the first group of private networks.

Next, in the location registration switching process, there is no base station whose reception power is at the communication appropriate level (the reception power of the base station connected to the mobile terminal 4 at step M23 in FIG. The location registration canceling process executed when the location registration switching process is interrupted or when the power switch of the mobile terminal is turned off while connected to the base station will be described. In the mobile terminal 4, even if the power switch provided on the operation panel or the like is turned off by the user, power is supplied to each circuit for executing the following processing at least until the processing is completed. And

The location registration canceling process uses one of the procedures shown in FIG. 6 (the procedure of the first embodiment) or FIG. 12 (the procedure of the second embodiment). In other words, the mobile terminal 4 determines that the network whose location is being registered (the network to which the connected base station belongs) is the public network 1.
Alternatively, the procedure shown in FIG. 6 is used when the network is a private network of the first group, and the procedure shown in FIG. 12 is used when the network whose location is registered belongs to the private network of the second group.

When the location registration process is executed according to the procedure shown in FIG. 6, the public network 1 uses the location registration data shown in FIG. One of the location registration flags of the private network of the group is changed from "1" to "0".

Finally, the incoming call processing when the public network receives an incoming request for a mobile terminal will be described. The priority of the network executing the call of the mobile terminal 4 is given to the public network 1, the first group of private networks connected to the digital network 11, and then the second group connected to the telephone line 16. The order will be private networks. Regarding the public network 1 and the private network of the first group, the public network 1 can recognize the public network communication area or the private network in which the mobile terminal 4 has registered the location by the location registration data of the location registration database 20. If the mobile terminal 4 is registered in these networks, the mobile terminal is called from the network. If the mobile terminal 4 has not registered in the above network, the mobile terminal 4 sequentially transfers incoming call requests to the second group of private networks based on the private network Call 4

FIG. 17 is a flowchart showing the procedure of the incoming call processing. In FIG. 17, the public network 1 receives a call request to a mobile terminal (step N10).
1) Location registration data of the mobile terminal 4 in the location registration database 20 by the location registration DBMS 19 (FIG. 15 (a))
To determine whether the mobile terminal 4 is registered in the public network 1 or the private network of the first group (step N102). That is, it is checked whether or not there is a communication area or a private network whose location registration flag is "1" in the location registration data of the mobile terminal 4.

If the location of the mobile terminal 4 is registered in step N102 (if the location registration data has a location registration flag of "1"), the network in which the location of the mobile terminal 4 is registered is It is determined whether the network is the public network 1 or the first group of private networks (step N103). If the location is registered in the public network 1, the mobile terminal 4 is called from the public network base station in the communication area where the location is registered (step N).
104). If the location is registered in the private network of the first group, the incoming call request is transferred to the private network (step N105). The first group of private networks to which the mobile terminal 4 has registered its location receive the incoming call request transferred from the public network 1 (step L101), and call the mobile terminal 4 from the base station to which the mobile terminal 4 is connected. (Step L102).

The mobile terminal 4 receives the above call (step M101), and when a response operation is performed by the user (step M102), transmits a response signal to the called network (step M103).

When the network that called the mobile terminal 4 is the first group of private networks, the first group of private networks receives the response signal from the mobile terminal 4 (step L103), and transmits the received response signal to the public. Transfer to the network 1 (step L104).

The public network 1 determines whether or not a response signal has been received within a predetermined time from the start of the call of the mobile terminal 4 (step N106). In response, an incoming call refusal message is returned (step N107). If a response signal can be received, a communication path is established between the caller and the mobile terminal according to a predetermined protocol.

If the location of the mobile terminal 4 has not been registered in step N102 (if all the location registration flags of the location registration data are "0"), the private network of the mobile terminal 4 in the location registration database 20 Incoming call forwarding list (FIG. 15)
Based on (b)), an incoming call transfer private network is selected (step N108). That is, the second group of private networks (in FIG. 15B, the second group of private networks (2)) in the transfer order "1" in the private network list is selected as the incoming call transfer private network. Next, the incoming call request is transferred to the incoming call transfer private network (step N109).

The incoming call transfer private network receives the incoming call request transferred from the public network 1 (step L'101), and judges whether or not the mobile terminal 4 to which the incoming call request is registered in its own network (step L'101). If the location is registered, the mobile terminal 4 is called (step L'103).
If the location is not registered, the incoming call request is ignored.

The mobile terminal 4 receives the call from the transfer destination private network (step M101), and if a response operation is performed by the user (step M102), transmits a response signal to the incoming call transfer private network. (Step M10
3). In this case, the incoming call transfer private network receives the response signal from the mobile terminal 4 (step L'104) and transfers this response signal to the public network 1 (step L'105).

The public network 1 determines whether a response signal has been received from the incoming call transfer private network within a predetermined time from the start of calling the mobile terminal 4 (step N110). When a response signal is received, a communication path is established between the caller and the mobile terminal 4 according to a predetermined protocol.

If no response signal is received in step N110, it is determined whether there is another private network of the second group to which the call is to be transferred based on the private network call transfer list (step N110). N111), if there is another private network to which the call is to be transferred, the private network is newly set as the call transfer private network (step N112), and the process returns to step N109. That is, the transfer order “2” is added to the private network incoming call transfer list.
15 (in FIG. 15 (b), a private network (n '), n' is a positive integer), the private network is set as a new incoming call transfer private network, and Forward incoming call request. As described above, the incoming call request is sequentially transferred to the private networks of the second group from the transfer order "1" to "n '" in the private network incoming call transfer list in FIG. . If there is no other private network to which the call is transferred in step N111, the process proceeds to step N107.

As described above, according to the third embodiment,
The user of the mobile terminal 4 can communicate using the network with the lowest communication fee without performing the switching operation of the network for registering the location of the mobile terminal 4.

The public network 1 recognizes whether the mobile terminal 4 is registered in the public network 1 or the private network of the first group, and determines whether the mobile terminal 4 and the private network of the second group are registered. Of the incoming and outgoing call communication of the mobile terminal 4, and when the mobile terminal 4 receives a call, if the mobile terminal 4 is registered in the public network 1 or the private network of the first group, the incoming call is forwarded only to that network. If the mobile terminal 4 is not registered in the public network 1 or the private network of the first group, incoming calls are forwarded in order from the private network of the second group having a high frequency of outgoing / incoming communication. The incoming call can be reliably transferred to the mobile terminal 4 with the traffic amount.

[0142]

As described above in detail, according to the mobile communication system of the present invention, the user of the mobile terminal does not need to be aware of the switching of the network for which the location is to be registered, and the public network or one or more private networks. Since communication can be performed using any of the above, there is an effect that a trouble-free system that emphasizes human interfaces can be provided.

Further, by making the public network recognize the private network whose location is being registered by the mobile terminal, or by providing a list indicating the order of incoming calls to the private network, incoming calls can be transferred reliably with the minimum public network line traffic volume. There is an effect that can be.

If the fee charged from the public network is determined according to the number of private networks registered in the location registration database, a clear billing system can be formed.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an example of a system configuration according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of a configuration of location registration data of a mobile terminal in a location registration database according to the first embodiment of the present invention.

FIG. 3 is a flowchart illustrating a procedure of an initial position registration process according to the first embodiment of the present invention.

FIG. 4 is a flowchart illustrating a procedure of a location registration switching process between a public network and a private network according to the first embodiment of the present invention.

FIG. 5 is a flowchart showing a procedure of a location registration switching process from a private network to another private network in the first embodiment of the present invention.

FIG. 6 is a flowchart illustrating a procedure of a location registration release process according to the first embodiment of the present invention.

FIG. 7 is a flowchart illustrating a procedure of an incoming call processing according to the first embodiment of the present invention.

FIG. 8 is a diagram illustrating an example of a system configuration according to a second embodiment of the present invention.

FIG. 9 is a diagram showing an example of the configuration of public network location registration data and a private network incoming call transfer list in a location registration database according to the second embodiment of the present invention.

FIG. 10 is a flowchart illustrating a procedure of an initial position registration process according to the second embodiment of the present invention.

FIG. 11 is a flowchart illustrating a procedure of a location registration switching process between private networks according to the second embodiment of the present invention.

FIG. 12 is a flowchart illustrating a procedure of a location registration release process according to the second embodiment of the present invention.

FIG. 13 is a flowchart illustrating a procedure of an incoming call processing according to the second embodiment of the present invention.

FIG. 14 is a diagram illustrating an example of a system configuration according to a third embodiment of the present invention.

FIG. 15 is a diagram showing an example of the configuration of location registration data and a private network incoming call transfer list in a location registration database according to the third embodiment of the present invention.

FIG. 16 is a flowchart illustrating a procedure of a location registration switching process between a first group of private networks and a second group of private networks according to the third embodiment of the present invention.

FIG. 17 is a flowchart illustrating a procedure of an incoming call processing according to the third embodiment of the present invention.

[Explanation of symbols]

1 public network, 2, 3, 6, 7 private network, 4 mobile terminal,
11 digital circuit network, 12 network control system, 1
3, 17, 19 location registration database management system (location registration DBMS), 14, 18, 20 location registration database, 15 public network base station, 16 telephone network, 2
1, 31 private network controller, 22, 32, 33, 61,
71 Private network base station

Claims (6)

[Claims] 1. A public network, one or more private networks connected to the public network, and a mobile terminal that performs location registration with any of the networks and communicates with a base station of the location-registered network. In the mobile communication system, the mobile terminal stores in advance a location registration network list indicating a priority order of a network to be registered, and monitors reception power of a transmission signal from each base station of each network. Recognizing a communicable base station, and registering a position in a network having the highest priority of the location registration network list in a network to which the communicable base station belongs, wherein the priority of the location registration network list is currently Mobile communication characterized in that when a base station of a network higher than the network whose location is being registered becomes communicable, a new location is registered in this network and the location registration of the previously registered network is canceled. system. 2. The mobile communication system according to claim 1, wherein the priorities of the networks for which the mobile terminals register their positions are arranged in order from the network having the lowest network usage fee during communication. Mobile communication system. 3. The mobile communication system according to claim 1, wherein each of the networks is provided with a network identifier indicating its own network in the transmission signal, and the mobile terminal performs location registration or location registration cancellation. Recognize which of the above networks is the above-mentioned network by the network identifier, and when registering a new private network without registering a location in any of the networks, register the location in this private network. To
The public network is notified to the public network via this private network, and when the network for new location registration is a private network and the network for location registration cancellation is the public network, the newly registered private network is registered to the public network. Notify, and when both the network to be newly registered and the network to be unregistered are private networks, notify the newly registered private network to the public network via the unregistered private network, If the network whose location registration is to be released without new location registration is a public network, the public network is notified that no new location registration is to be performed, and the network whose location registration is to be released without new location registration is a private network. When the location registration is canceled without newly registering the location, the public network is notified through the private network to the public network, and the public network determines in which network the mobile terminal has registered the location. A location registration database that stores location registration data Updating the content of the location registration base according to the location registration and location registration cancellation to the public network by the mobile terminal, and the notification from the mobile terminal; and receiving the incoming call request for the mobile terminal, the location registration. Referring to the data, call the mobile terminal if the mobile terminal is registered in the public network, and transfer the incoming call request to the private network if the mobile terminal is registered in the private network. Characteristic mobile communication system. 4. The mobile communication system according to claim 1, wherein the public network is a public network location registration data indicating whether or not the mobile terminal has registered a location in a public network, and the mobile terminal. A private network incoming call transfer list indicating the transfer order of incoming call requests to the private network, and a position registration database for storing the position of the public network according to the position registration or release of position registration to the public network by the mobile terminal. Updating data, upon receiving an incoming call request for the mobile terminal, refers to the PSTN location registration data, calls the mobile terminal if the mobile terminal is registered in the PSTN, A mobile communication system characterized by sequentially transferring the incoming call request to the private network according to the incoming call transfer order if the location is not registered in the network. 5. The mobile communication system according to claim 1, wherein the private network includes one or more private networks belonging to a first group and one or more private networks belonging to a second group.
Each of the networks is provided with a network identifier indicating its own network in the transmission signal, and the mobile terminal is the network whose location registration or location registration is to be released. Is recognized by the network identifier, and when the location is newly registered in the first group of private networks without being registered in any of the networks, the fact that the location has been registered in the private network is notified through this private network. If the network to be newly registered is the first group of private networks and the network to be unregistered is a public network, the newly registered private network is notified to the public network. When the network to be newly registered is not a public network and the network to be unregistered is a private network of the first group, the cancellation of the location registration of this private network is performed through this private network. A network that notifies the public network and registers a new location If the network whose location registration is to be canceled is a private network belonging to the second group, the fact that the location has been registered in this private network is notified to the public network via the newly registered private network, and the new location registration is performed. If the network whose location registration is to be unregistered is a public network, the public network is notified that no new location registration is to be performed, and the first group of private networks is to be deregistered without newly performing location registration. Is notified to the public network via the private network that the location registration of the private network has been released without newly registering the location. Location registration data indicating in which of the private networks of the group the location registration is being performed, and a private network incoming call transfer list indicating the transfer order of the incoming request to the mobile terminal to the private network of the second group. Has a location registration database to store, to the public network by the mobile terminal Location registration and location registration cancellation, and updating the content of the location registration data according to the notification from the mobile terminal; upon receiving an incoming call request for the mobile terminal, referencing the location registration data; If the mobile terminal has been registered in the first group, the mobile terminal calls the mobile terminal.If the mobile terminal has been registered in the first group of private networks, the mobile terminal transfers the incoming call request to the private network. A mobile communication system characterized by sequentially transferring the incoming call request to a second private network according to the incoming call transfer order unless the location is registered in any of the private networks. 6. The mobile communication system according to claim 4, wherein the public network observes an outgoing / incoming call communication frequency between a private network in a private network incoming call transfer list and the mobile terminal, A mobile communication system wherein the incoming call transfer order of the private network incoming call transfer list is sequentially transferred from a private network in which the mobile terminal frequently performs outgoing / incoming call communication.