JP2000224641A - Mobile communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile communication system capable of efficiently utilizing a network and reducing the load of a home location registration(HLR) management part and the load of a network connected to the HLR management part. SOLUTION: This system is provided with plural mobile terminals 5, an exchange 1 connected with an exchange network for establishing a connection between the mobile terminals or between the mobile terminal and an existing telephone network, an HLR management part 2 for managing the location information and certificate information of all the subscribed mobile terminals and a temporary information storage part 3 connected to the exchange 1 for storing the certificate information of the mobile terminals in an exchange control area. Besides, the mobile terminal 5 is provided with a certificate information registration destination storage device for identifying the exchange to hold the certificate information by storing the identification number of the exchange having the location registered the last time and sends an identification number to the exchange 1 at the time of new location registration and the exchange 1 can know the position storing information related to the mobile terminal 5 from the identification number.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system, and more particularly to a mobile communication system having a large number of mobile terminals and having a possibility that access to authentication information may be concentrated. The present invention relates to an information management method and an improvement of a location registration management method for a home location registration management unit.

[0002]

2. Description of the Related Art In mobile communication, since terminals move, there is no fixed accommodation position in an exchange accommodating a subscriber of a communication network. In addition, a common function of various mobile communications is required to share a wireless line among a plurality of mobile terminals. The mobile communication network adopts a cell system capable of repeatedly using a frequency and implements the following tracking exchange.

[0003] A subscriber file of a mobile terminal (recording subscriber data and a service area) is installed in a specific mobile switching center (home memory station), and the mobile terminal registers its service area in the home memory station. Perform location registration. When a mobile terminal receives an incoming call, the subscriber file is remotely accessed via the common channel signaling network, and the exchange simultaneously calls in the area where the mobile terminal is located (calls the mobile terminal in all wireless zones in the location registration area). And connect the line. In order to enable continuation of communication across wireless zones, a channel is switched during a call.

FIG. 9 is a diagram showing a logical structure of a conventional mobile communication system.

In FIG. 9, a cell 100 in the lowermost layer is
The communication range of a wireless station with which a mobile terminal directly communicates is shown. The position registration area 101 in the upper layer is a region for registering the position of the mobile terminal in units of this cell and performing a simultaneous call to the entire registration area when a call is received. The switching network 1 which is the layer above it
Reference numeral 02 denotes an exchange for establishing communication between the location registration areas.

A home location registration management unit (HLR) 103 is connected to the exchange network, and holds and manages authentication information used for authentication at the time of location registration, a current position value of a mobile terminal, and the like. Things.

When a mobile terminal moves from one location registration area to another location registration area, the mobile terminal requests a new location registration. The network stores the new location of the mobile terminal in HLR 103 and makes it available for incoming calls.

In the conventional mobile communication system, unauthorized use is prevented at the time of location registration, outgoing / incoming call, and switching of a cell during communication.
Authentication is performed to prevent double connection.

FIG. 10 is a diagram showing an authentication procedure at the time of location registration in a conventional mobile communication system.

In FIG. 10, reference numeral 110 denotes a mobile terminal (M
S) and 111 are exchanges (MSC), and 112 is a home location registration management unit (HLR).

First, assuming that the mobile terminal (MS) has newly moved to another location registration area, it outputs a location registration request to the exchange (MSC). The exchange issues an authentication information read request to the mobile terminal that has requested the location registration to the home location registration management unit (hereinafter, appropriately referred to as HLR),
The HLR returns the authentication information.

The exchange performs an authentication operation using the authentication information and the generated random number. The exchange sends the generated random number to the mobile terminal and outputs an authentication request.

The mobile terminal performs an authentication operation using the received random number and the authentication information originally held, and sends the result to the exchange. The exchange compares the result of the authentication operation performed by itself with the result of the authentication operation sent from the mobile terminal, and sends a position registration instruction to the HLR if they match, performs position registration. Refuse.

As described above, the HLR needs to manage all locations and authentication information of mobile terminals.

[0015]

However, such a conventional mobile communication system has the following problems.

Since the location information of all the subscribed terminals is centrally managed by the HLR, location registration requests are frequently generated due to an increase in the number of subscribed mobile terminals, and the load on the HLR increases.
There is a drawback that the network load connected to the HLR increases and the operating efficiency of the system decreases. In addition, there is a disadvantage in that the time required for location registration is increased, and normal system operation becomes difficult.

Further, when the mobile terminal moves at high speed, in a mobile communication system in which the location registration area is set relatively small, the location registration request of the mobile terminal frequently occurs, and the load on the mobile terminal and the load on the mobile terminal are reduced. However, there is a disadvantage that the load on the communication path between the mobile terminal and the base station or the network between the base station and the exchange increases.

According to the present invention, in a mobile communication system in which access to authentication information may be concentrated, the load on the home location registration management unit and the load on the network connected to the home location registration management unit can be reduced. It is an object of the present invention to provide a mobile communication system capable of making efficient use of a network.

Further, according to the present invention, the location registration request when the mobile terminal moves at high speed is reduced, the frequency of access to the home location registration management unit is reduced, and the mobile terminal, the wireless communication path, the base station and the exchange are exchanged. It is an object of the present invention to provide a mobile communication system capable of reducing a load on a communication path of the present invention and enabling efficient use of a network.

[0020]

A mobile communication system according to the present invention comprises a plurality of mobile terminals connected to each other by an exchange network, and an exchange for establishing a connection between the mobile terminals or between the mobile terminals and an existing telephone network. A home location registration management unit that is read when the exchange establishes a connection or is used when the mobile terminal performs location registration, and manages location information and authentication information of all subscribed mobile terminals, and connects to the exchange. An authentication information storage device that stores authentication information of mobile terminals in the exchange control area, comprising: an authentication information storage device connected to an exchange that requests location registration of the mobile terminal, The mobile terminal is provided with storage means for storing the authentication information and identifying the exchange in which the authentication information is held by storing the identification number of the exchange which performed the previous location registration, and Transmits the identification number to the exchange, the exchange is configured to know the storage location of the information associated with the mobile terminal by the identification number.

The mobile terminal sends the identification number to the exchange at the time of new location registration, thereby obtaining the authentication information by communication between the information storage device or the exchange without requesting the authentication information from the home location registration management unit. You may do so.

[0022] The exchange may include means for selecting which of the home location registration management unit and the exchange which has performed the previous location registration requests authentication information.

A mobile communication system according to the present invention is connected to a plurality of mobile terminals by an exchange network, and establishes a connection between mobile terminals or between a mobile terminal and an existing telephone network, and the exchange establishes a connection. In a mobile communication system comprising a home location registration management unit for reading location information, used when a mobile terminal performs location registration, and managing location information and authentication information of all subscribing mobile terminals, an exchange is provided. Means for setting a time from when a location registration request is issued from the mobile terminal to when an authentication information request is made to the home location registration management unit, means for measuring time from the location registration request by the mobile terminal, and delay Means for storing information of the mobile terminal during the communication, and means for controlling to request the home location registration management unit for authentication information after a set time has elapsed. Equipped and configure.

A mobile communication system according to the present invention is connected to a plurality of mobile terminals by an exchange network, and establishes a connection between mobile terminals or between a mobile terminal and an existing telephone network, and the exchange establishes a connection. In a mobile communication system provided with a home location registration management unit for reading location information, used when the mobile terminal performs location registration, and managing location information and authentication information of all subscribing mobile terminals, The terminal sets a time from when the movement of the location registration area is detected until a location registration request is made to the exchange, a means for measuring the set time, and a location registration request after the set time has elapsed. And means for controlling so as to carry out.

A mobile communication system according to the present invention is connected to a plurality of mobile terminals by an exchange network, and establishes a connection between mobile terminals or between a mobile terminal and an existing telephone network, and the exchange establishes a connection. In a mobile communication system provided with a home location registration management unit for reading location information, used when the mobile terminal performs location registration, and managing location information and authentication information of all subscribing mobile terminals, A terminal configured to set a maximum value of the location registration request interval;
Means for measuring the time since the last location registration request transmission,
Means for controlling to make a position registration request after a set time has elapsed when the position registration area moves.

[0026]

Embodiments of the present invention will be described below with reference to the drawings. First Embodiment The present embodiment is to reduce access to authentication information in a mobile communication system in which access to authentication information may be concentrated.

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

In FIG. 1, reference numeral 1 denotes an exchange connected by an exchange network, and the exchange 1 establishes a connection between mobile terminals or between a mobile terminal and an existing telephone network. A home location registration management unit (hereinafter, appropriately referred to as an HLR) 2 manages location information and authentication information of all subscribed mobile terminals, and is read or exchanged when the exchange 1 establishes a connection. Enable the terminal to perform location registration. The temporary information storage device 3 (authentication information storage device) is connected to the exchange 1 and stores authentication information of mobile terminals in the exchange control area of the connected exchange. The base station (BS) 4 is a wireless station that performs wireless communication with the mobile terminal 5, and communicates with a mobile terminal in a cell that is an area where the base station can communicate. The mobile terminal 5 is a normal mobile terminal, and is capable of communicating even when moving between cells, between location registration areas, and between switching control areas.

The exchange control area comprises one or more location registration areas, and indicates an area targeted by one exchange.

FIG. 2 is a block diagram showing the configuration of the mobile terminal 5 and shows only parts relevant to the present invention.

In FIG. 2, the mobile terminal 5 includes a radio transmitting / receiving unit 11, a control unit 12, and an authentication information registration destination storage device 13 (storage means).

The radio transmission / reception unit 11 performs transmission / reception for performing radio communication with a base station.

The control unit 12 controls the mobile terminal. The functions related to the present invention include transmitting the authentication information 14 and the mobile station number 15 and registering the authentication information received from the base station. The authentication information registration destination storage device 1
3 means to read out the registration destination from the authentication information registration destination storage device 13 and transmit it to the base station.

The authentication information registration destination storage device 13 stores an identifier for identifying an exchange connected to the temporary authentication information storage device in which the authentication information of the terminal registered previously is stored.

The authentication information 14 is stored and held at the time of registration of a mobile terminal.
Is also registered. The mobile device number 15 is also stored and held at the time of registration, and is a reference number for communication and authentication.

The operation of the mobile communication system configured as described above will be described below.

FIGS. 3 and 4 are diagrams showing an authentication procedure at the time of location registration of the mobile communication system, and FIG. 4 shows a continuation of the authentication procedure at the time of location registration of FIG. In the drawing, reference numerals 20 to 51 denote operations.

In FIG. 3, reference numeral 20 denotes a mobile terminal (MS);
Reference numeral 21 denotes the exchange 1 (MSC1), and reference numeral 22 denotes a home location registration management unit (HLR). Now, the mobile terminal (MS) 20
Is in the control area of the exchange (MSC1) 21.

When the power of the mobile terminal 20 is turned on, a location registration request (23) is sent to the exchange 21. At this time, the mobile terminal 20 simultaneously transmits its own mobile station number. In this case, since the mobile terminal 20 is the first location registration after the power is turned on, the contents of the authentication information registration destination storage device 13 in the mobile terminal 20 are not valid and are not transmitted to the exchange 21 or invalid. Inform.

The exchange 21 that has received the location registration request (23) receives the HLR 22 because the authentication information registration destination is invalid.
Sends an authentication information read request (24). In this case, the mobile station number received from the mobile terminal 20 is simultaneously transmitted.

In the HLR 22, the authentication information read request (2
When receiving 4), the authentication information corresponding to the mobile unit number is sent to the exchange 21 as an authentication information read response (25). As the authentication information transmitted at this time, a secret key registered at the time of normal mobile terminal registration is used.

Upon receiving the authentication information, the exchange 21 generates a random number (26), sends the generated random number to the mobile terminal 20, and issues an authentication request (27).

Using the generated random numbers and authentication information, authentication calculations 28 and 29 are performed in both mobile terminal 20 and exchange 21. The mobile terminal 20 returns the result of the authentication operation (28) to the exchange 21 as an authentication response (30). On the other hand, the exchange 21 compares the result calculated by itself with the result sent from the mobile terminal 20 (31). If they do not match, it sends out a location registration rejection (32) to the mobile terminal 20. A location registration instruction (33) is sent to the HLR 22. Further, the mobile terminal 20 sends a location registration response (34) indicating that the location registration has been completed, together with its own exchange number.

The mobile terminal 20 stores the received exchange number in the authentication information registration destination storage device 13 (FIG. 2) (3).
5). The exchange 21 stores the authentication information in the temporary information storage device 3.
(FIG. 1). The HLR 22 stores the location information of the mobile terminal 20, and makes it possible to respond to a request from the exchange 21 at the time of an incoming call or the like (37).

FIG. 4 shows a location registration procedure when the mobile terminal 20 moves to the location registration area (41) and enters another location registration area from the previous location registration area. As described above, the mobile terminal 20 sends a location registration request (42) to the exchange 2 ($ SC2) 40.

The exchange 2 ($ SC2) 40 replaces the same one as the exchange 1 ($ SC1) 21 if the location registration area to which the previous location registration was performed and the current location registration area belong to the same exchange control area. It refers to another exchange if it belongs to a different exchange control area.

In the current location registration request (42), since the information in the authentication information registration destination storage device in the mobile terminal is valid, the registration destination exchange number is transmitted at the same time.

In the exchange 2 (@ SC2) 40, the authentication information registration destination is confirmed (43), and the received exchange number is compared with its own exchange number (44). It is determined that the same location registration area has been performed, and that the authentication information of the mobile terminal exists in its own temporary information storage device 3 (FIG. 1). After this,
The authentication information is extracted from the temporary information storage device 3, and the authentication calculation is performed in the same manner as described above. In this case, there is no need to request the HLR 22 for authentication information.

If it is assumed that the exchange number received from the mobile terminal 20 is not its own, it is necessary to request authentication information from the HLR 22 or check the mobile terminal 20 by examining a predetermined rule or the load state of the HLR 22.
It is determined whether a request is made to the exchange corresponding to the exchange number received from (45). In this judgment (45),
The exchange corresponding to the exchange number, exchange 1 in the case of FIG.
(@ SC1) When the request is made to the number 21 (46), (4)
7).

Thereafter, the authentication information of the mobile terminal is stored in the exchange 2
(ΜSC2) Since it is held at 40, the exchange 1
($ SC1) Request to delete authentication information to 21 (48)
I do. In exchange 1 ($ SC1) 21, a deletion request (4
8) Upon receipt, the authentication information of the corresponding mobile device number is deleted from the temporary information storage device. Also in this case, there is no need to request the HLR 22 for authentication information.

If the above-mentioned judgment is a request for the HLR 22, the authentication information is similarly transmitted to the exchange 2 ($ SC2) 4
Since it is held at 0, an authentication information deletion request (49) is made to the exchange 1 ($ SC1) 21. Exchange 2 (@SC
2) Upon receiving the deletion request (49), the 40 deletes the authentication information of the corresponding mobile station number from the temporary information storage device.

Next, as shown in the numbers (50) and (51), an authentication information read request is made to the HLR 22. Thereafter, returning to FIG. 3, the above-described authentication calculation is continued.

As described above, the mobile communication system according to the first embodiment is connected to a plurality of mobile terminals 20 by an exchange network, and connects between mobile terminals or between a mobile terminal and an existing telephone network. An exchange 1 to be established, a home location registration management unit (HLR) 2 for managing location information and authentication information of all mobile terminals to be joined, and authentication information of mobile terminals connected to the exchange 1 and located in the exchange control area. The mobile terminal 20 includes a temporary information storage device 3 and an authentication information registration destination storage device 13 that identifies an exchange in which the authentication information is held by storing the identification number of the exchange that performed the previous location registration. When a new location is registered, the identification number is sent to the exchange 1, and the exchange 1 uses the identification number to
Since the storage location of the information related to 0 is configured to be known, the authentication information is obtained only by the temporary information storage device 3 connected to the exchange 1 or only the communication between the exchanges without requesting the HLR 2 for the authentication information. Can HLR
2 and the network load connected to the HLR 2 can be reduced. In addition, the exchange 1 is configured so that it is possible to select whether to request authentication information from the HLR 2 or the exchange that has performed the previous location registration according to a predetermined rule or network conditions. Allocation becomes possible.

Second Embodiment This embodiment relates to a method for reducing a location registration request to a home location registration management unit (HLR).

FIG. 5 is a configuration diagram of a mobile communication system according to the second embodiment of the present invention.

In FIG. 5, reference numeral 61 denotes a normal mobile terminal, and it is assumed that the mobile terminal 61 can communicate even when moving between location registration areas and between switching control areas. The exchange 62 establishes a connection between mobile terminals or between a mobile terminal and an existing telephone network. Home Location Registration Management Unit (HLR) 67
Manages location information and authentication information of all subscribed mobile terminals, and is read out when the exchange 62 establishes a connection, and enables the mobile terminal to perform location registration.

The exchange 62 includes a delay time register 63, a timer 64, a location registration control unit 65, and a terminal device information register 66. Here, only the parts related to the present invention are shown.

When there is a position registration request from the mobile terminal 61, the delay time register 63 is set to H by the value of this register.
A register for storing a set value for delaying an authentication information request to the LR 67, and is connected to the timer 64. The timer 64 is a timer for measuring the delay time set in the delay time register 63 when there is a position registration request from the mobile terminal 61, and is connected to the delay time register 63 and the position registration control unit 65. .

The position registration control unit 65 receives the position registration from the mobile terminal 61, starts the timer 64, holds the terminal device number, requests authentication information to the HLR 67, and performs a position registration instruction. This is a part for controlling necessary operations.

The terminal device information register 66 is a register for holding the device number and the position registration area number of the mobile terminal 61 which has made the position registration request.

Hereinafter, the operation of the mobile communication system configured as described above will be described.

FIG. 6 is a diagram showing a procedure at the time of location registration of the mobile communication system. In the figure, reference numerals 210 to 231 are symbols for explaining the operation.

In FIG. 6, reference numeral 210 denotes a mobile terminal (M
S), 221 indicates an exchange (MSC), and 212 indicates a home location registration management unit (HLR). Now, mobile terminal (MS)
It is assumed that 210 is in the control area of the exchange (MSC) 211.

When the power of the mobile terminal 210 is turned on, or when the mobile terminal 210 moves in the location registration area, the location registration request (21)
3) is sent to the exchange 211. At this time, the mobile terminal 21
0 transmits its own mobile station number at the same time. The exchange 211, which has received the location registration request (213),
Is started (214), and the terminal device number and the identifier of the current location registration area are stored in the terminal device information register 66 (215). Thereafter, the timer 64 elapses by the value of the preset delay time register 63 (22
1) Then, the authentication information is requested to the HLR 212 (22).
2) Do it. At this time, the terminal device number stored in the terminal device information register 66 is simultaneously transmitted. Here, a value indicating no delay can be set in the timer 64. If the value indicating no delay is set, the authentication information request (222) is immediately transmitted to the HLR 212.

However, before the timer 64 elapses by the value of the delay time register 63, it is assumed that the mobile terminal 210 has moved from the location registration area so far to another location registration area which is the same exchange control area (216). Then, a location registration request (217) is made to the same exchange.
In this case, since the location registration request is issued again before the timer 64 expires, the terminal information is overwritten (220) in the terminal device information register 66 by the activation of the timer 64 (219), and the HLR 212 is sent to the HLR 212 by the previous location registration request. No access. At this time, the timer 64 can be restarted, or the previous value can be used.

FIG. 6 shows a case of restarting (219). Thereafter, when the timer 64 elapses by a preset value of the delay time register 63 (221), the authentication information is requested to the HLR 212 (222).

The following steps are performed in the same manner as the conventional location registration procedure shown in FIG. 10. When the HLR 212 receives the authentication information read request, the HLR 212 sends the authentication information corresponding to the mobile unit number to the authentication information read response (223). ), The exchange 21
Send to 1. As the authentication information transmitted at this time, a secret key registered at the time of normal mobile terminal registration is used.

In the exchange 211 receiving the authentication information,
A random number is generated (224), and the generated random number is
0 and sends an authentication request (225). Using the generated random number and the authentication information, the authentication calculation (226), (22)
7) is performed in both the mobile terminal 210 and the exchange 211. In the mobile terminal 210, the authentication information is normally registered at the time of registration.
It is held in the form of OM. The mobile terminal 210 sends the result of the authentication operation (227) back to the exchange 211 as an authentication response (228).

The exchange 211 compares the result calculated by itself with the result sent from the mobile terminal 210 (229).
If they do not match, the location registration is rejected (230) is sent to the mobile terminal 210. If they match, the location registration instruction is sent to the HLR2.
12 (231). The mobile station 210 sends a location registration response (232) indicating that the location registration has been completed, together with its own exchange number.

As described above, in the mobile communication system according to the second embodiment, the exchange 62
, A delay time register 63 for setting a time from when a location registration request is issued to when the authentication information request is made to the HLR 67, a timer 64 for measuring the time from the location registration request by the mobile terminal 61, and a delay. Between, mobile terminal 61
And a location registration control unit 65 that controls the HLR 67 to make a request for authentication information after a set time has elapsed. It is possible to reduce the frequency of access to the HLR 67 when the location 61 moves at high speed and the location registration frequently occurs, thereby reducing the load on the HLR 67 and the network load connected to the HLR 67.

Further, the switch or another network device determines the status of the network and the load of the HLR, so that the delay time can be appropriately set, and the network can be used efficiently.

Third Embodiment This embodiment relates to a method for reducing a location registration request to a home location registration management unit (HLR) and reducing loads on a mobile terminal and a network.

FIG. 7 is a configuration diagram of a mobile communication system according to the third embodiment of the present invention.

In FIG. 7, mobile terminal 71 is a normal mobile terminal, and can communicate even when moving between location registration areas and exchange control areas.

The mobile terminal 71 includes a radio transmitting / receiving section 72, a location registration area movement detection section 73, a timer 74, a delay time register 75, a location registration request interval register 76, and a timer 77.
And a location registration control unit 78. Here, only the parts related to the present invention are shown.

The radio transmission / reception unit 72 enables transmission / reception of radio communication with the base station, and is connected to the location registration area movement detection unit 73. The location registration area movement detection unit 73 is a part that detects that the mobile terminal 71 has moved in the location registration area. The timer 74 is connected to the position registration area movement detection unit 73, the delay time register 75, and the position registration control unit 78, and measures the time from detecting the entry into the new position registration area. When the value of the register 75 is reached, the information is sent to the location registration
8.

The delay time register 75 is a register for setting a time from when a new location registration area is moved to when a location registration request is issued. The delay time register 75 can be set to a fixed value or can be set. .

The position registration request interval register 76 is for setting the maximum delay for transmitting a position registration request when the position registration area has been moved since the last time the position registration request was transmitted. Similarly, it can be fixed or configurable.

The timer 77 is connected to the location registration control unit 78 and the location registration request interval register 76, measures the time since the location registration request was sent out, and when the timer reaches the set value of the location registration request interval register 76, The information is sent to the location registration control unit 78.

The location registration control unit 78 is connected to the timer 74, the timer 77, and the radio transmission / reception unit 72. When a new location registration area is entered, the location registration control unit 78 calculates the following delay by the timer 74 and the maximum delay by the timer 77. As shown in the operation, the location registration request is sent to the wireless transmission / reception unit 72.

The base station 79 communicates with the mobile terminal 71 wirelessly, and relays a location registration request to the exchange 80. Further, the base station 79 constantly detects the location registration area number, thereby enabling detection that the mobile terminal 71 has moved through the location registration area.

The exchange 80 establishes a connection between mobile terminals or between a mobile terminal and an existing telephone network. HL
R81 manages location information and authentication information of all subscribing mobile terminals, and is read out when the exchange 80 establishes a connection, and enables the mobile terminal 71 to perform location registration.

Hereinafter, the operation of the mobile communication system configured as described above will be described.

FIG. 8 is a diagram showing a procedure at the time of location registration of the mobile communication system. In the figure, reference numerals 320 to 333 are symbols for explaining the operation.

In FIG. 8, reference numeral 320 denotes a mobile terminal (M
S), 321 denotes an exchange (MSC), and 322 denotes a home location registration management unit (HLR).

First, it is assumed that the mobile terminal 320 moves in the location registration area and sends a location registration request (323) to the exchange 321. The exchange 321 sends an authentication information read request (324) to the HLR 322. Thereafter, the authentication procedure continues as in the conventional example shown in FIG. 10, but is not shown in FIG. 8 because it is the same procedure.

In mobile terminal 320, when a position registration request is sent, position registration control section 78 starts timer 77.
Thereafter, it is assumed that the position registration area is moved (326).
When the radio transmission / reception unit 72 receives the notification of the location registration area number from the base station 79 and the location registration area movement detection unit 73 detects that it is different from the previous number, the timer 74
Is started (327). Thereafter, the value of the timer 77 is checked and compared with the value set in the position registration request interval register 76 (3.
28). When the value of the timer 77 is equal to the set value,
If it has moved from the location registration area for which the location registration was requested last time, it is determined that the maximum time of the location registration request interval set in the location registration request interval register 76 has elapsed since the previous location registration request was sent, and A request (332) is sent to the exchange 321.

If the result of comparison by the timer 77 has not reached the value set in the location registration request interval register 76, the value of the timer 74 is checked and compared with the value set in the delay time register 75 (329). If the value of the timer 74 is equal to the set value, it is determined that the time set in the delay time register 75 has elapsed since the movement of the position registration area, and
A location registration request (332) is sent to the exchange 321.

If the comparison result by the timer 74 has not reached the set value of the delay time register 75, it is checked next whether the position registration area has been moved (330). If the location registration area has been moved, the timer 74
Is restarted (331), and the process returns to the step (328) of checking the timer 77 again. Therefore, in this case, the position registration request (332) based on the previous movement of the position registration area is:
Does not happen.

When the location registration area has not been moved,
Returning to the investigation of the timer 77, the timer 74 or the timer 7
Wait for 7 to become the value of each register to be compared.

As described above, the timer 74 or the timer 7
When the register 7 reaches the values of the registers 75 and 76 to be compared with each other, a location registration request (332) is sent to the exchange 321. The exchange 321 sends an authentication information read request (333) to the HLR 322. Thereafter, authentication is performed in the same manner as in the conventional example, and location registration or location registration rejection is performed.

As described above, in the mobile communication system according to the third embodiment, the mobile terminal 71
A position registration area movement detection unit 73 for detecting that the user 1 has moved to the position registration area, a timer 74 for measuring a time after detecting that the user has entered a new position registration area,
A delay time register 75 for setting the time from when moving to a new location registration area to when a location registration request is made, and a location registration request when the location registration area is moved since the previous location registration request was sent. A position registration request interval register 76 for setting the maximum delay, a timer 77 for measuring the time since sending the position registration request, and a position registration after the set time elapses when the position registration area moves. And a location registration control unit 78 that controls to make a request. After the time from when the movement of the location registration area is detected to when the location registration request is issued to the exchange 80, the location Since a registration request is made, the position registration request when the mobile terminal 70 moves at high speed is reduced, the frequency of access to the HLR 81 is reduced, and 71 Alternatively, the wireless communication path, it is possible to reduce the load of the communication channel with the base station exchanges, network efficient use or can reduce the power consumption of the mobile terminal.

Further, the maximum value of the position registration request interval is set in the position registration request interval register 76, the time from the previous transmission of the position registration request is measured by the timer 77, and the position registration control unit 78 determines that the position registration area is When moving, the system is configured to perform a position registration request after the set time has elapsed, so that the time during which the position registration request is not made can be minimized, and the position can be specified in detail. It becomes possible, and further reduction of network load can be expected.

The first embodiment is an example in which the present invention is applied to a mobile communication system having a large number of mobile terminals and access to authentication information may be concentrated. The present invention is applicable to all mobile communication systems in which communication data is accessed and communication terminals move.

Further, in the second embodiment, similarly to the first embodiment, the present invention can be applied to all mobile communication systems in which centrally managed data such as authentication information is accessed and communication terminals move at high speed. Further, the present invention can be applied to a case where the range of the position registration area is set small even in low-speed movement.

In the third embodiment, the first and second
Similar to the embodiment, the present invention can be applied to all mobile communication systems for mobile terminals capable of high-speed movement.

In each of the above embodiments, the mobile terminal can be applied to an automobile telephone, but is not limited to this, and can be applied to all mobile communication systems that perform mobile communication. .

Further, the type of each unit constituting the mobile communication system, the type of mobile communication network and access method, incoming connection, location registration, authentication information control, and the like are not limited to the above-described embodiments.

[0099]

In the mobile communication system according to the present invention,
The authentication information storage device connected to the exchange requesting the location registration of the mobile terminal stores the authentication information, and the mobile terminal stores the identification information of the exchange that performed the location registration last time so that the authentication information is held. A storage means for identifying the exchange is provided, and the identification number is sent to the exchange when a new location is registered.The exchange is configured to know the storage location of the information related to the mobile terminal by the identification number, so that access to the authentication information is prevented. In a mobile communication system in which there is a possibility of concentration, the load on the home location registration management unit and the load on the network connected to the home location registration management unit can be reduced, and the network can be used efficiently. .

In the mobile communication system according to the present invention, the exchange sets means for setting a time from when a location registration request is issued from the mobile terminal to when an authentication information request is made to the home location registration management unit, Means for measuring the time from the location registration request by, means for storing information of the mobile terminal during the delay, and after the set time has elapsed,
Means for controlling the home location registration management unit to make a request for authentication information, so that the mobile terminal moves at high speed and access to the home location registration management unit when location registration frequently occurs. The frequency can be reduced, and the load on the home location registration management unit and the network load connected to the home location registration management unit can be reduced.

In the mobile communication system according to the present invention, the mobile terminal sets time from when the movement of the location registration area is detected to when it issues a location registration request to the exchange, and measures the set time. Means, and means for controlling to make a location registration request after a set time has elapsed, so that the location registration request when the mobile terminal moves at high speed is reduced, and the home location registration management unit In addition to reducing the frequency of access, the load on the mobile terminal, the wireless communication path, and the communication path between the base station and the exchange can be reduced, and the network can be used efficiently.

In the mobile communication system according to the present invention, the mobile terminal sets the maximum value of the location registration request interval, measures the time since the previous location registration request was sent, and moves the location registration area. Means for performing a location registration request after a set time has elapsed, the location registration request when the mobile terminal moves at high speed is reduced, and the home location registration management unit , The load on the mobile terminal, the wireless communication path, and the communication path between the base station and the exchange can be reduced, and the network can be used efficiently.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a mobile communication system according to a first embodiment to which the present invention has been applied.

FIG. 2 is a block diagram showing a configuration of a mobile terminal of the mobile communication system.

FIG. 3 is a diagram showing an authentication procedure at the time of location registration of the mobile communication system.

FIG. 4 is a diagram showing an authentication procedure at the time of location registration of the mobile communication system.

FIG. 5 is a diagram showing a configuration of a mobile communication system according to a second embodiment to which the present invention has been applied.

FIG. 6 is a diagram showing a procedure at the time of location registration of the mobile communication system.

FIG. 7 is a diagram illustrating a configuration of a mobile communication system according to a third embodiment to which the present invention has been applied.

FIG. 8 is a diagram showing a procedure at the time of location registration of the mobile communication system.

FIG. 9 is a diagram showing a logical structure of a conventional mobile communication system.

FIG. 10 is a diagram showing an authentication procedure at the time of location registration in a conventional mobile communication system.

[Explanation of symbols]

1, 62, 80 exchange, 2, 67, 81 home location registration management unit (HLR), 3 temporary information storage device (authentication information storage device), 4, 79 base station (BS), 5, 61,
71 mobile terminal, 11, 72 wireless transmission / reception unit, 12 control unit, 13 authentication information registration destination storage device (storage means), 6
3 delay time register, 64, 74, 77 timer, 6
5 location registration control unit, 66 terminal device information register, 7
3 position registration area movement detection unit, 75 delay time register, 76 position registration request interval register, 78 position registration control unit

Claims (6)

[Claims] An exchange connected to a plurality of mobile terminals by an exchange network and establishing a connection between the mobile terminals or between the mobile terminals and an existing telephone network; a switch which is read when the exchange establishes a connection; A home location registration management unit that is used when a mobile terminal performs location registration and manages location information and authentication information of all subscribing mobile terminals, and stores authentication information of mobile terminals in an exchange control area that are connected to an exchange. A mobile communication system comprising an authentication information storage device that performs authentication, wherein the authentication information storage device connected to an exchange that requests location registration of the mobile terminal stores authentication information; Storage means for identifying the exchange in which the authentication information is stored by storing the identification number of the registered exchange; transmitting the identification number to the exchange when a new location is registered; Exchange, mobile communication system, characterized in that to know the storage location of the information associated with the mobile terminal by the identification number. 2. The mobile terminal sends the identification number to the exchange at the time of a new location registration, so that the mobile terminal does not request authentication information from the home location registration management unit, so that the information storage device or the exchange can be used. The mobile communication system according to claim 1, wherein the authentication information is obtained by the communication of (1). 3. The exchange according to claim 1, further comprising means for selecting whether to request authentication information from the home location registration management unit or the exchange that has performed location registration last time. Mobile communication system. 4. An exchange connected to a plurality of mobile terminals by an exchange network and establishing a connection between the mobile terminals or between the mobile terminal and an existing telephone network; and a switch which is read when the exchange establishes a connection. A mobile communication system including a home location registration management unit that is used when the mobile terminal performs location registration and manages location information and authentication information of all subscribing mobile terminals; Means for setting the time from when there is a request until the authentication information request is made to the home location registration management unit; means for measuring the time from the location registration request by the mobile terminal; Means for storing terminal information; and means for controlling the home location registration management unit to request authentication information after a set time has elapsed. Mobile communication system. 5. An exchange connected to a plurality of mobile terminals by an exchange network and establishing a connection between the mobile terminals or between the mobile terminal and an existing telephone network, and a switch which is read when the exchange establishes a connection. A mobile communication system including a home location registration management unit that is used when the mobile terminal performs location registration and manages location information and authentication information of all subscribed mobile terminals, wherein the mobile terminal has a location registration area. Means for setting a time from when the movement is detected to when a location registration request is issued to the exchange; means for measuring the set time; and control to make a location registration request after the set time has elapsed. A mobile communication system comprising: 6. An exchange connected to a plurality of mobile terminals by an exchange network and establishing a connection between the mobile terminals or between the mobile terminal and an existing telephone network; and a switch which is read when the exchange establishes a connection. A mobile communication system including a home location registration management unit that is used when the mobile terminal performs location registration and manages location information and authentication information of all subscribing mobile terminals, wherein the mobile terminal has a location registration request interval. Means for setting the maximum value of the position, means for measuring the time since the last time the position registration request was sent, and control to make a position registration request after the set time has elapsed when the position registration area has moved. Mobile communication system comprising: