JP2000261849A - Mobile communication exchange system, mobile communication home station and private mobile communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile communication exchange system where traffic for managing mobile stations can sufficiently be reduced. SOLUTION: When position registration is requested from a mobile station 2 (S101), an exchange station 7 acquires the profile of the mobile station 2 from a home station 11 (S102-S105), and uses the acquired profile to execute authentication confirmation processing with the mobile station 2 (S106-S111). Then the home station 11 informs only an exchange station 8 adjacent to the exchange station 7 about the profile (S112-S116). Thus, the adjacent exchange station 8 realizes hand-over at high speed even when the mobile station 2 approaches the station 8. Since the profile is given only to the adjacent exchange station 8, the traffic can be reduced in comparison with the case of informing all exchange stations about the profile.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a private mobile communication system such as a PHS (Personal Handyphone System) system used in business establishments, a switching system applied to a mobile communication system such as this private mobile communication system, and a home station. .

[0002]

2. Description of the Related Art Conventionally, PHS (Perso
In a private mobile communication system such as a nal handyphone system), one of the exchanges for exchange control is set as a home station, and a home memory storing a profile as subscriber information is connected to the home station. The station manages the position of the mobile station. In this case, the location management of the mobile station in the home station is performed for each area controlled by the exchange.

[0003] Specifically, when a location registration request is issued from a mobile station, an exchange controlling the area where the location registration request is issued inquires the home station about the profile of the mobile station. Next, the exchange confirms that the mobile station requesting the location registration is a contracted one based on the inquired profile. After that, it requests the home station to update the location registration. The home station that has received this request accesses the home memory and updates the current location of the mobile station that has requested location registration to the area of the exchange that has requested location registration update. In this way, the location registration in the home station in units of jurisdiction area is achieved.

However, in this technique, each time a location registration request is issued from a mobile station, it is necessary for the exchange station to inquire the home station of a profile each time. Therefore, the number of times of communication between the exchange and the home station is large, and the traffic for mobile station management is very large. For this reason, a reduction in system efficiency has been a problem.

A technique for coping with this is disclosed in, for example, Japanese Patent Application Laid-Open No. 7-322340. According to the technique disclosed in this publication, when a location registration is requested from a mobile station, a profile of the mobile station is broadcast from the home station to all other switching stations in advance. In other words, all the exchanges that have jurisdiction over the area where the mobile station may move have obtained the profile in advance by this broadcast notification. Therefore, when the mobile station moves to a different area, the destination exchange can authenticate the mobile station without inquiring the home station about the profile of the mobile station. Therefore, traffic for mobile station management can be reduced.

[0006]

However, in the technique disclosed in the above-mentioned publication, every time a mobile station requests location registration, profiles are notified to all exchanges. There are limits to reducing Therefore, processing on the network side cannot be sufficiently simplified, and data transmission cannot be sufficiently efficient. For this reason, there is a limit in improving the system performance.

An object of the present invention is to solve the above technical problems and to provide a mobile communication switching system and a mobile communication home station capable of reducing traffic for mobile station management.

Another object of the present invention is to provide a private mobile communication system capable of realizing good handover and improving system efficiency by using the above-mentioned mobile communication switching system or mobile communication home station. To provide.

[0009]

In order to achieve the above object, the present invention executes switching control of communication performed by a mobile station, holds a profile of the mobile station, and stores the held profile in the switching station. In the home station that manages the location of the mobile station and notifies the location of the mobile station, when the location registration of the mobile station is requested by the exchange, the profile of the mobile station subject to the location registration, The notification is made only to the adjacent switching center.

According to the present invention, when a location registration request is made, a profile is notified only from the home station to the adjacent exchange. That is, before the mobile station moves to the adjacent area, the profile is notified in advance only to the adjacent exchanges of the exchanges that have requested location registration among all the exchanges. Therefore, the traffic can be significantly reduced as compared with the case where the profiles are notified to all the exchanges.

[0011] In many cases, a mobile station moves in a certain direction. Therefore, traffic can be further reduced by limiting the adjacent exchanges to be notified of the profile to, for example, only those existing in the moving direction of the mobile station. The moving direction of the mobile station may be determined with reference to a communication history indicating which base station the mobile station has communicated with.
The communication history may be obtained, for example, by the exchange station and notified to the home station.

In order to prevent the home station from centrally managing the adjacent exchange information, for example, the following configuration can be adopted.

[0013] When a location registration of a mobile station is requested from the exchange, the profile of the mobile station subject to the location registration is notified from the home station to the exchange that has requested the location registration. After that, in the exchange which holds the adjacent exchange information about the adjacent exchange, when the mobile station requests the location registration after the profile is notified from the home station, the exchange stores the above-mentioned profile in the retained exchange. The information is notified to the home station as a destination. Then, the profile is notified only from the home station to the adjacent exchange specified based on the adjacent exchange information as the destination.

As described above, the data management can be facilitated by distributing and managing the adjacent switching center information to the switching centers.

[0015]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

Embodiment 1 FIG. 1 is a PHS (Personal Handyphone System) for business use according to the first embodiment of the present invention.
m) is a block diagram illustrating the overall configuration of the system. This business site PHS system is a private mobile communication system in which a limited area is a service area. A limited area is defined as within geographically close or distant facilities (including premises) owned by the same business entity (such as a company and public entity).
Within railway facilities including stations and railways operated by the same company,
In addition, in an area composed of a plurality of facilities each operated by a different business operator. PHS for this business
The system provides a wireless communication system having an economical and simple configuration by using such a closed area as a service area and using wireless equipment as low-power wireless equipment.

More specifically, this business PHS system includes a network system 1 and a mobile station 2,
Communication is performed between the network system 1 and the mobile station 2 via radio waves. The mobile station 2 is a PHS which is a low power radio equipment.
It is composed of a telephone. The mobile station 2 holds an authentication key that has been previously agreed with the network system 1 side. The authentication key is a kind of encryption key that certifies that the mobile station 2 has been contracted.

The network system 1 includes a plurality of base stations 3a, 3b, 3c, 4a, 4b, 4c, 5a, 5b, 5
c (hereinafter collectively referred to as “base station 6”), a plurality of exchanges 7, 8, 9 (hereinafter collectively referred to as “exchange station 1”).
0 ". ), A home station 11, a home memory 12, and a station memory 13. The network system 1 is of a star type in which all exchanges 10 are connected to a home station 11. In the first embodiment, the exchange 10 and the home station 11 function as an exchange system for performing exchange control and managing the location of the mobile station 2.

The base station 6 is a low-power radio equipment whose transmission output is suppressed to a low power, and is a cell A1, A2, A3, B1, B2, B3, C1, C2, which is a relatively small radio zone.
C3 (hereinafter collectively referred to as "cell D") is formed. In the first embodiment, one cell D is connected to the exchange 10
Has been set as one location registration area managed by.
For this purpose, the base station 6 constantly notifies each cell D of a unique location registration area number. The radius of cell D is PDC
(Personal Digital Cellular) and GSM (Global Sys
cell in a general mobile communication system such as a mobile communication system, for example, indoor 5
0 m, outdoor 200 m. The base station 6 communicates with the mobile station 2 in the cell D formed by the base station 6 via a wireless line.

The exchange 10 executes exchange control and mobile station authentication processing. The exchange 10 includes a plurality of base stations 6
(Three in FIG. 1) are connected. The exchange 7 manages the cells A1 to A3 formed by the base stations 3a to 3c as location registration areas, respectively.
The entire A3 is under the jurisdiction of the own area. The exchange 8 manages the cells B1 to B3 formed by the base stations 4a to 4c as location registration areas, respectively, and manages the entire cells B1 to B3 as a jurisdiction area F which is an own station area. Further, the exchange 9 includes cells C1 to C5 formed by the base stations 5a to 5c.
C3 is managed as a location registration area, and the entire cell C1 to C3 is controlled as a controlled area G which is a local station area. In the following, the jurisdictions E, F,
When G is collectively referred to, it is referred to as a jurisdiction area H. The radius of the jurisdiction area H is smaller than the jurisdiction area of the general mobile communication system as described above.
m, about 500 m outdoors.

The switching center 10 performs exchange control of communication between the mobile station 2 existing in the jurisdiction area H and another communication station such as another mobile station 2 and a fixed communication station. More specifically, the exchange 10 connects a line between the mobile station 2 and a communication station of the other party or transmits a transmission signal from another communication station to the mobile station 2 when, for example, the mobile station 2 makes or receives a call. 2 is transferred to the base station 6 forming the cell D in which the cell 2 exists.

The exchange 10 also executes a process for confirming the authentication of the mobile station 2 existing in the jurisdiction area H. In this case, the exchange 10 executes a mobile station authentication process based on the subscriber information (profile) of the mobile station 2 held in the home station 11. The exchanges 7 to 9 have memories 14, 15, and 16 (hereinafter, collectively referred to as "memory 17"). The memory 17 is for storing a profile previously notified from the home station 11 in the profile notification process.

The home station 11 has a special function such as a function of managing the position of the mobile station 2 and a profile notification function of notifying a profile to an adjacent exchange in advance, in addition to the exchange control function as an exchange. An adjacent exchange is an exchange 10 that has jurisdiction over a jurisdiction area H that is adjacent to a jurisdiction area H that is under the jurisdiction of an arbitrary exchange 10.

The home station 11 executes exchange control of communication performed by the mobile station 2. Specifically, for example, when the home station 11 makes or receives a call to the mobile station 2, the home station 11
A communication signal transmitted from the mobile station 2 via the switching station 10 is connected to a line between the mobile station 2 and the communication station of the other party. Or transfer it to the station 10.

A home memory 12 is connected to the home station 11. Home memory 12 stores a database including a profile. The profile includes a mobile station number, the current position of the mobile station 2 associated with the mobile station number, and an authentication key. The mobile station number is mobile station 2
Corresponds to an identification number for identifying When the mobile station 2 requests location registration, the home station 11
Update the current position in the profile stored in 2. That is, the home station 11 manages the current location of the mobile station 2 in units of the jurisdiction area H.

The home station 11 is connected to a station memory 13. The station memory 13 stores station identification data. The station identification data specifies an exchange adjacent to the exchange 10. The station memory 13 stores the station identification data of all the adjacent exchanges for each of all the exchanges 10. The home station 11 specifies an adjacent exchange of the arbitrary exchange 10 by referring to the office identification data stored in the office memory 13.

When the PHS system for business establishment having the above-described configuration is applied in the facility of the same business operator, the home station 11 is installed at the head office, for example, and the exchange 10 is installed at the branch office.
When the PHS system for business establishment having the above configuration is applied to a railway facility of the same business operator, the home station 11 is installed at a main station, for example, and the exchange 10 is installed at another station. Further, when the above-configured PHS system for business use is applied in an area including the entire facility operated by each of the different businesses, the home station 11 and the exchange 7 are installed at, for example, the head office and the branch office of a certain business, respectively. The exchanges 8 and 9 are installed at branch offices of other operators, respectively.
In this case, a configuration is conceivable in which, for example, a gateway device is inserted between the home station 11 and the exchanges 8 and 9 operated by other operators.

FIG. 2 is a sequence diagram for explaining the profile notification processing in the business PHS system. For example, when the mobile station 2 moves to the area E under the jurisdiction of the exchange 7 and turns on the power while the power is off, it is necessary to request the network system 1 for location registration.

For example, when the mobile station 2 requests location registration when the mobile station 2 is located in the cell A1 in the jurisdiction area E, the mobile station 2 sends a location registration request signal via the base station 3a to the exchange station 7.
(S101). The location registration request signal includes the mobile station number. When receiving the location registration request signal, the exchange 7 transmits a call setup message to the home station 11 (S102). This call setup message includes the mobile station number and profile request data.

Upon receiving the call setup message, home station 11 returns a call setup acceptance message indicating that the call setup message has been received to exchange 7 (S103). Further, the home station 11 reads the profile corresponding to the mobile station number from the home memory 12 based on the mobile station number included in the received call setup message. Then, the home station 11 creates a response message including the read profile, and transmits the created response message to the exchange 7 (S104).

Upon receiving the response message, the exchange 7 returns a response confirmation message indicating that the response message has been received to the home station 11 (S105). Also,
The exchange 7 extracts a profile from the received response message, and further extracts a mobile station number from the extracted profile. Further, the exchange 7 generates an arbitrary authentication random number. The authentication random number is used in an authentication process described later.

Thereafter, the exchange 7 sends an authentication request message to the mobile station 2 via the base station 3a (S10).
6). The authentication request message is for confirming whether the mobile station 2 that has requested the location registration is a contracted one, and includes the mobile station number and the authentication random number extracted from the response message.

Upon receiving the authentication request message, the mobile station 2 extracts an authentication random number included in the received authentication request message. The mobile station 2 performs a calculation according to a predetermined algorithm using the extracted authentication random number and an authentication key held by the mobile station 2 in advance. As a result, an authentication calculation result is obtained. The mobile station 2 transmits an authentication response message including the authentication calculation result to the exchange 7 via the base station 3a (S107).

Upon receiving the authentication response message, the exchange 7 verifies the result of the authentication operation in order to confirm whether or not the mobile station 2 requesting the location registration is a contracted one. As described above, the authentication key and the calculation algorithm are predetermined between the network system 1 and the mobile station 2. Therefore, the network system 1 can obtain the calculation result of the predetermined authentication key and the authentication random number.

For this reason, the exchange 7 determines whether or not the calculation result obtained by itself and the authentication calculation result received from the mobile station 2 match. If they match, it can be confirmed that the mobile station 2 that has requested location registration is a contracted one. When the mobile station 2 is authenticated as a contracted one, the exchange 7 transmits a facility message to the home station 11 (S108). The facility message is a message for requesting location registration. Thus,
The exchange 7 notifies the home station 11 that the mobile station 2 exists under its own control.

When the home station 11 receives the facility message, it accesses the home memory 12 and determines the current position of the mobile station number corresponding to the received facility message, and stores the current position of the mobile station number in the area E of the exchange 7 that has transmitted the facility message. Update to After that, the home station 11
Transmits a call release message instructing call release to the exchange 7 as a location registration response (S109).

Upon receiving the call release message, the exchange 7 transmits a location registration acceptance message indicating that location registration has been accepted to the mobile station 2 via the base station 3a (S1).
10). Further, the exchange 7 transmits a release completion message, which is a response to the call release instruction, to the home station 11 and releases the call (S111). Thus, the position registration processing is completed.

After completion of the location registration process, the home station 11 notifies the profile of the mobile station 2 to the adjacent exchange of the exchange 10 irrespective of whether or not the mobile station 2 has moved to the area H of the adjacent exchange. Execute the processing to be performed. That is, there is a possibility that the mobile station 2 moves to the area H under the jurisdiction of the adjacent exchange. At this time, if the destination switching center 10 has requested the home station 11 to transmit a profile as described above,
take time. Therefore, the process of notifying the profile in advance only to an adjacent switching center to which the mobile station 2 may move is performed.

More specifically, the home station 11 specifies all the exchanges adjacent to the exchange 7 whose location has been registered, based on the station identification data stored in the office memory 13. Thereafter, the home station 11 transmits a call setup message to the specified adjacent exchange (S112). This call setup message includes the profile of the mobile station 2 that has requested location registration. In the first embodiment, since the only exchange that is adjacent to the exchange 7 is the exchange 8, only the communication between the home office 11 and the exchange 8 will be described below.

Upon receiving the call setup message, the exchange 8 returns a call setup acceptance message to the home station 11 (S113). In addition, the exchange 8 extracts the profile included in the call setup message. After that, the exchange 8 stores the extracted profile in the memory 15. Further, the exchange 8 transmits a call release message for releasing the call to the home station 11 (S114). Upon receiving the call release message, the home station 11 returns a call release completion message to the exchange 8 (S115). In this way, the profile notification processing by the home station 11 to the adjacent exchange 8 is completed.

When the mobile station 2 moves in the non-communication state and moves out of the relevant jurisdiction area E and moves to the adjacent jurisdiction area F, the mobile station 2 needs to update its current position to a new jurisdiction area F. There is.

FIG. 3 is a sequence diagram showing a processing flow when the mobile station 2 has moved to the area F under the control of the exchange 8. When recognizing that the mobile station 2 has moved to the area F under the jurisdiction of the exchange 8, the mobile station 2 requests the exchange 8 for location registration. Specifically, the mobile station 2 transmits a location registration request signal including the mobile station number to the exchange 8 via the base station 4a (S201).

Upon receiving the location registration request signal, the exchange 8 accesses the memory 15 and reads the profile corresponding to the mobile station number contained in the received location registration request signal. When the profile is read, the exchange 8
Transmits an authentication request message to the mobile station 2 via the base station 4a.
(S202).

The subsequent authentication calculation processing by the mobile station 2 and the location registration processing (S203 to S208) by the exchange 8 and the home station 11 are the same as the processing described with reference to FIG. 2 (see S107 to S111). , The description of which is omitted.

The change of the jurisdiction area in the mobile station 2 is recognized as follows. When the reception quality of the currently received radio wave is degraded, the mobile station 2 searches for another radio wave with good reception quality. On the other hand, a radio wave radiated from the network system 1 includes a jurisdiction area number. The mobile station 2 can recognize that the service area H has been changed by referring to the service area number.

After the completion of the location registration processing, the home station 11 deletes the profile stored in the memory 14 of the switching center 7 of the moving source. Specifically, the home station 11 transmits a call setup message including a profile deletion message indicating the deletion of the profile to the switching center 7 of the movement source (S2).
09).

Upon receiving this call setup message, switching center 7 transmits a call setup acceptance message to home station 11 (S210). Further, the exchange 7 deletes the profile stored in the memory 14 based on the profile deletion message included in the call setting message. Thereafter, the exchange 7 transmits a deletion confirmation message indicating that the profile has been deleted to the home station 11 (S21).
1).

Upon receiving the delete confirmation message, the home station 11 transmits a call release message to the exchange 7 (S
212). Upon receiving the call release message, the exchange 7 returns a call release completion message to the home station 11 (S213). Thus, the profile deletion processing is completed.

The mobile station 2 that has moved to the jurisdiction area F
In addition, there is a possibility of moving to adjacent jurisdiction areas E and G. Therefore, after the completion of the profile deletion process, the home station 11 executes the profile notification process to the exchanges 7 and 9 that have jurisdiction over the jurisdiction areas E and G adjacent to the jurisdiction area F.

More specifically, the home station 11 transmits a call setup message including a profile to each of the two exchanges 7 and 9 that have jurisdiction over the jurisdiction areas E and G (S214). Upon receiving the call setup message, each of the exchanges 7 and 9 returns a call setup acceptance message to the home station 11 (S215), extracts a profile included in the received call setup message, and stores the profile in the memory 14, 16 is stored. Thereafter, a call release message is transmitted from the exchanges 7 and 9 to the home station 11 (S216), and a call release completion message is returned from the home station 11 to the exchanges 7 and 9 (S217). Complete.

As described above, according to the first embodiment, the profile of the mobile station 2 is notified only to the adjacent exchange in advance, based on the location registration request of the mobile station 2. Therefore,
Even if the mobile station 2 moves to the area H of the adjacent exchange, the adjacent exchange to which the mobile station 2 moves does not need to inquire the home station 11 of the profile. Therefore, location registration can be performed quickly. Therefore, for example, when the mobile station 2 starts communication after location registration and moves to the area H under the control of the adjacent exchange while maintaining the communication, the handover can be performed at high speed. Therefore, good handover can be realized, and a user-friendly system can be constructed.

This effect is particularly prominent in a business-use PHS system as in the first embodiment. That is, in the PHS system for business use, the jurisdiction area H is very narrow as compared with the general mobile phone system and the PHS system, and the mobile station 2 frequently moves between the jurisdiction areas H.

Since the notification of the profile of the mobile station 2 is limited to the adjacent exchanges, all the exchanges 1
Compared with the case where the profile is notified to 0, the traffic for the profile notification can be reduced. Therefore, the processing of the network system 1 can be simplified. Therefore, a business-use PHS system with improved system efficiency can be provided.

Embodiment 2 FIG. 4 is a sequence diagram showing a flow of a profile notification process in the business PHS system according to the second embodiment of the present invention.

In the first embodiment, the profile of the mobile station 2 is notified to all adjacent exchanges. On the contrary,
In the second embodiment, the profile of the mobile station 2 is notified only to an adjacent exchange located in the moving direction of the mobile station 2.

More specifically, for example, when the mobile station 2 is in the cell A of the base station 3a formed in the area E under the control of the exchange station 7,
When performing location registration within the mobile station 1, the mobile station 2 transmits a location registration request signal to the exchange 7 via the base station 3a (S30).
1). The exchange 7 receives the location registration request signal from the base station 3a, so that the mobile station 2
You can know that it exists within.

Thereafter, the processing for position registration from S302 to S311 is the same as the processing from S102 to S111 in FIG. By performing the location registration processing, the profile of the mobile station 2 is stored in the memory 14 of the exchange 7.

After the completion of the location registration, the mobile station 2 determines whether or not the mobile station 2 has moved to an adjacent cell, which is a different location registration area, based on the location registration area number broadcast from the base station 6. When the mobile station 2 receives a location registration area number broadcast in the cell A2 different from the location registration area number broadcast in the cell A1, for example, the mobile station 2 transmits a location registration request signal to the base station 3b forming the adjacent cell A2. The data is transmitted to the exchange 7 via the network (S312).

When receiving the second location registration request signal, the exchange 7 accesses the memory 14 and
Execute the authentication process. That is, the exchange 7 transmits an authentication request message including the authentication random number and the profile read from the memory 14 to the mobile station 2 (S31).
3). The mobile station 2 executes an authentication operation and transmits an authentication response message including the result to the exchange 7 (S3).
14). The exchange 7 confirms the authentication based on the authentication calculation result transmitted from the mobile station 2 and, if affirmative, transmits a location registration acceptance message to the mobile station 2 (S315).

On the other hand, when receiving the second location registration request signal, the exchange 7 can know the moving direction of the mobile station 2. That is, in this case, the mobile station 2 is connected to the exchange 8
Is moving toward the jurisdiction area F.

More specifically, the exchange 7 transmits to the home station 11 a call setting message including the moving direction information indicating the moving direction of the mobile station 2 and the profile read from the memory 14 (S316). . The home station 11
Upon receiving the call setup message, the mobile station returns a call setup acceptance message to the exchange 7 (S317), and transmits a call release message to the exchange 7 (S318). The exchange 7
Upon receiving the call release message, it returns a call release confirmation message to the home station 11 (S319). This allows
The call between the exchange 7 and the home station 11 is released.

After that, the home station 11 extracts the moving direction information included in the call setting message. Home station 1
Reference numeral 1 specifies an adjacent exchange located in the moving direction based on the read moving direction information and the station identification data stored in the station memory 13. In this case, the exchange 8 becomes an adjacent exchange. Also, the home station 11 extracts the profile included in the call setup message. afterwards,
The home station 11 creates a call setup message including the extracted profile. At this time, the destination is only the specified exchange 8. The home station 11 notifies only the exchange 8 of the created call setup message (S3).
20). When the exchange 8 receives the call setup message,
The profile included in the call setting message is extracted, and the extracted profile is stored in the memory 15.
As a result, even when the mobile station 2 has moved to the area F under the jurisdiction of the exchange 8, the exchange 8 can perform authentication confirmation of the mobile station 2 without inquiring the home station 11 of the profile.

In addition, in response to the reception of the call setting message, the exchange 8 returns a call setting accepting message to the home station 11 (S321), and transmits a call release message to the home station 11 (S322). The home station 11
In response to receiving the call release message, a call release confirmation message is returned to the exchange 8 (S323). As a result, the call between the home station 11 and the exchange 8 is released, and the profile notification processing is completed.

As described above, according to the second embodiment, the mobile station 2 is restricted to only the adjacent exchanges existing in the moving direction of the mobile station 2.
Is notified in advance, the traffic for profile notification can be reduced as compared with the case of the first embodiment. This effect becomes more remarkable as the number of adjacent exchanges increases. Therefore, it is possible to provide an office PHS system with further improved system efficiency.

Embodiment 3 FIG. 5 is a sequence diagram for explaining a flow of a profile notification process in the business PHS system according to the third embodiment of the present invention.

In the first and second embodiments, the case where the profile notification process is executed at the time of location registration in the non-communication state is taken as an example. On the other hand, the third embodiment exemplifies a case where the profile notification process is executed at the time of location registration in a communication state.

More specifically, when the mobile station 2 starts communication after the location registration of the mobile station 2 is completed in the jurisdiction area E, the mobile station 2 exchanges a call setup message via the base station 3a. The data is transmitted to the station 7 (S401). On the other hand, the exchange 7 has the profile of the mobile station 2 in the memory 14 because the location registration of the mobile station 2 has already been completed. When receiving the call setup message, the exchange 7 transmits an authentication request message including the authentication random number and the mobile station number in the profile stored in the memory 14 to the mobile station 2 via the base station 3a (S40).
2).

The mobile station 2 executes an authentication calculation process using the authentication random number included in the received authentication request message, and sends an authentication response message including the authentication calculation result to the base station 3.
The message is transmitted to the exchange 7 via the communication node a (S403). Exchange 7
Transmits a call setting acceptance message to the mobile station 2 via the base station 3a if it is determined that the user is a contractor based on the authentication calculation result included in the received authentication response message (S404). Thereafter, upon receiving a response from the communication partner of the mobile station 2, the exchange 7 transmits the response to the mobile station 2 via the base station 3a (S405).

Further, the exchange 7 notifies the adjacent exchange 8 of the result of the authentication operation. Specifically, the exchange 7 transmits a call setup message including the result of the authentication operation to the home station 11 (S406). After returning the call setting acceptance message to the exchange 7 (S407), the home station 11 transmits a call release message including the result of the authentication operation to the exchange 7 and receives a call release completion message from the mobile station 2. (S408, S409), the call to the exchange 7 is released.

Further, the home station 11 refers to the station identification data stored in the station memory 13 and specifies the adjacent exchange 8 of the exchange 7. Thereafter, the home station 11 transmits a call setup message including the authentication operation result and the profile to the specified adjacent exchange 8 (S4).
10). The adjacent exchange 8 extracts an authentication operation result and a profile from the received call setup message, and uses the extracted authentication operation result as an authentication random number in the memory 15.
And the profile is stored in the memory 15.

In the handover process, the authentication calculation result obtained in the mobile station 2 is used as an authentication random number in the handover process. Therefore, the exchange 7
Notifies the adjacent exchange 8 of the authentication operation result returned from the mobile station 2.

Thereafter, the adjacent exchange 8 returns a call setting acceptance message to the home station 11 (S41).
1) A call to the home station 11 is released by transmitting a call release message to the home station 11 and receiving a call release completion message from the home station 11 (S412, S413). Thus, the profile notification processing is achieved.

Thereafter, when the mobile station 2 moves to the adjacent cell 3b while communicating, the mobile station 2 transmits a call setup message (HO) including the handover request information to the exchange 7 via the base station 3b (S414). ). In this case, mobile station 2
Causes the call setup message to include the result of the authentication operation obtained at the start of communication. The exchange 7 returns a call setting acceptance message to the mobile station 2 in response to the call setting message (S
415). Further, the exchange 7 executes the authentication process with reference to the authentication calculation result included in the call setting message, and if the result is affirmative, executes the handover connection process. Thus,
Handover is achieved. After the end of the handover connection processing, the exchange 7 sends a response from the communication partner to the base station 3.
The data is transmitted to the mobile station 2 via b (S416).

At this time, the exchange 7 notifies the adjacent exchange 8 of the authentication calculation result transmitted from the mobile station 2 by the same processing as described above (S417 to S424). As described above, in the third embodiment, each time a handover is performed, the exchange 7 notifies the home station 11 of the authentication calculation result.

Thereafter, every time the mobile station 2 moves in the cell D, the same processing as described above is performed. When the mobile station 2 moves to the adjacent jurisdiction area F during communication, the mobile station 2
Requests a location registration together with handover to the destination exchange 8. Specifically, the mobile station 2 transmits a call setup message including the handover / location registration request information to the exchange 8 via the base station 4a.

Upon receiving the call setup message, switching center 8 reads the mobile station number and the result of the authentication calculation from memory 15 and exchanges the call setup message containing the read mobile station number and the result of the authentication calculation with mobile station 2. Send to
In this case, the exchange 8 uses the authentication calculation result as an authentication random number.

The mobile station 2 extracts an authentication calculation result from the received call setup message. The mobile station 2 executes an operation using the extracted authentication operation result as an authentication random number. Specifically, the mobile station 2 calculates using the authentication random number, the authentication key, and a predetermined algorithm. As a result, the mobile station 2 obtains a new authentication calculation result. Thereafter, the mobile station 2 transmits an authentication response message including the newly obtained authentication calculation result to the exchange 8.

The exchange 8 executes an operation using the authentication operation result stored in the memory 15 as an authentication random number. Specifically, the exchange 8 calculates using the authentication random number, the authentication key, and a predetermined algorithm.
The exchange 8 determines whether the calculation result matches the new authentication calculation result included in the received authentication response message. If they match, the exchange 8 executes the handover connection process and requests the home station 11 to update the location registration.

As described above, according to the third embodiment, the result of the authentication calculation required for the handover is notified to the adjacent exchange in advance, so that the handover can be performed quickly and smoothly even if the control area is moved during communication. It can be carried out. Therefore, it is possible to provide an office PHS system with improved communication quality.

When the PHS system for business use is applied to an area including the entire facility operated by each of the different business operators, the handover (roaming) can be performed quickly and smoothly between the systems operated by the different business operators. it can. Therefore, it is possible to move while communicating between areas operated by different operators. for that reason,
A very user-friendly system can be constructed for the user.

Embodiment 4 FIG. 6 is a sequence diagram for explaining a profile notification process in the business-use PHS system according to the fourth embodiment of the present invention.

In the third embodiment, each time a handover is performed, the result of the authentication operation and the profile are notified to the adjacent exchange. On the other hand, Embodiment 4
Now, the mobile station 2 is located in the cell D existing on the boundary of the jurisdiction area H.
Only at the time of handover executed when the user moves, the authentication calculation result and the profile are notified to the adjacent exchange.

More specifically, in the fourth embodiment, when transmitting any message to the exchange 10, the base station 6 inserts its own identification data into the message and transmits the message. Therefore, exchange 10 can know which base station 6 the received message was transmitted from. On the other hand, the exchange 10
Information on which base station 6 (hereinafter, referred to as a “boundary base station”) forming the cell D existing at the boundary of the jurisdiction area H is held in advance. Taking FIG. 1 as an example, the boundary base stations are the base stations 3a, 3c, 4a, 4c, 5a, 5c.

Therefore, when a call setup message including handover request information is transmitted from base station 6, switching station 10 determines which base station 6
It is determined whether or not the base station 6 is a boundary base station by checking whether or not the base station 6 has been received. If it is not a border base station, the exchange 10 does not notify the home station 11 of the authentication calculation result. If it is a border base station, the exchange 10 notifies the home station 11 of the authentication calculation result.

Referring to FIG. 6 in more detail,
When the mobile station 2 starts communication when it is in the cell A1, the mobile station 2 executes a call connection process including an authentication process with the exchange 7 via the base station 3a (S501 to S504). A response from the communication partner to be transmitted is received (S5).
05). In this case, the mobile station 2 has not requested a handover. Therefore, even when the mobile station 2 exists in the border cell, the exchange 7 does not notify the home station 11 of the authentication calculation result and the profile.

When the mobile station 2 moves to the cell A2, the mobile station 2 transmits a call setup message including handover request information.
(HO) is transmitted to the exchange 7 via the base station 3b (S5).
06). In this case, the exchange 7 transmits the call setting acceptance message and the response from the communication partner to the mobile station 2 (S507, S508). However, since the base station 6 that has requested the handover is not a boundary base station from the base station identification data, the exchange 7 does not notify the home station 11 of the authentication calculation result and the profile.

Further, when the mobile station 2 moves and reaches the cell A3, a call setup message including handover request information is transmitted from the mobile station 2 to the exchange 7 via the base station 3c (S509). . In this case, the exchange 7 transmits a call setting acceptance message and a response from the communication partner to the mobile station 2 (S510, S511). In addition, since the base station 6 that has requested the handover is found to be the boundary base station from the base station identification data, the exchange 7 executes the profile notification processing to the adjacent exchange 8 (S5).
12 to S519). In this case, the exchange 7 notifies the adjacent exchange 8 of the authentication calculation result transmitted from the mobile station 2 as an authentication random number.

As described above, according to the fourth embodiment, only when the mobile station has moved to the border cell, the adjacent exchange is notified of the authentication calculation result as the authentication random number. Therefore, traffic between the mobile station 2 and the exchange 10 can be reduced. Therefore, a business-use PHS system with simplified processing can be provided.

Embodiment 5 FIG. 7 is a conceptual diagram showing the overall configuration of a business-use PHS system according to Embodiment 5 of the present invention. 7, the same reference numerals are used for the same functional parts as those in FIG.

In the first to fourth embodiments, the home station 1
1 is connected to a station memory 13, and the home station 11 centrally manages station identification data on adjacent exchanges. However, in the fifth embodiment, each of the exchanges 7 to 9 owns the station identification data of its own adjacent exchange, and
Directly notifies the neighboring exchanges of the profile.

More specifically, no station memory is connected to the home station 11 according to the fifth embodiment. Instead, office memories 20, 21, and 22 are connected to the exchanges 7 to 9, respectively. Each of the office memories 20 to 22 stores office identification data relating to the adjacent exchanges of the connected exchanges 7 to 9, respectively.

More specifically, the station memory 20 contains the data shown in FIG.
As shown in FIG. 7, station identification data indicating the exchange 8 is stored. The station memory 21 stores station identification data indicating the exchanges 7 and 9 as shown in FIG. As shown in FIG. 8C, the station memory 22 stores station identification data indicating the exchange 8.

FIG. 9 is a sequence diagram for explaining the profile notification processing according to the fifth embodiment. The profile notification processing according to the fifth embodiment is performed by the exchange 10
Requesting the location registration of the mobile station 2 from the home station 11 and once requesting the location registration of the mobile station 2 after obtaining the profile, the profile is notified to the adjacent exchange 8 via the home station 11. Things.

More specifically, the mobile station 2 existing in the cell A1 requests the exchange 7 to perform location registration via the base station 3a (S601). In response, the exchange 7 executes the authentication processing and the location registration processing of the mobile station 2 (S602).
To S608). Thereafter, the call between the exchange 7 and the home station 11 is released (S609 to S611). Thus, the profile of the mobile station 2 is stored in the memory 14 of the exchange 7.

When the mobile station 2 moves to the next cell A2, the mobile station 2 has moved to a different location registration area. Therefore, the mobile station 2 requests the exchange 7 via the base station 3b for location registration (S612). ). In this case, since the exchange 7 is the second location registration request, the exchange 7 executes the authentication process using the profile stored in the memory 14 (S61).
3, S614), and notifies the mobile station 2 that the location registration has been accepted (S615).

After receiving the second location registration request, the exchange 7 notifies the profile stored in the memory 14 to the adjacent exchange. In this case, exchange 7
Reads out the station identification data stored in the station memory 20, and specifies the adjacent exchange of the own station based on the read station identification data. In this case, the adjacent exchange is the exchange 8 based on FIG. Therefore, the exchange 7
Executes a profile notification process to the adjacent exchange 8.

More specifically, switching center 7 transmits a call setup message including a profile to home station 11 (S616). In this case, the call setup message includes station identification data indicating the exchange 8 as destination data. The home station 11 receiving this call setup message
A call setting acceptance message is returned to the switching center 7 of the notification source (S617). Also, the home station 11 refers to the destination data in the call setting message and transfers the call setting message including the profile to the adjacent exchange 8 specified as the destination (S618).

The adjacent exchange 8 receiving the call setup message extracts a profile from the call setup message. Thereafter, the adjacent exchange 8 stores the extracted profile in the memory. The exchange 8 transmits a call setting acceptance message to the home station 11 (S61).
9). Thereafter, the call between the exchange 8 and the home station 11 is released, and the communication between the stations 8 and 11 is completed (S
620, S621). Further, the call between the home station 11 and the original exchange 7 is released, and the communication between these stations 11 and 7 is completed (S622, S623).

As described above, according to the fifth embodiment, since the exchange 10 directly notifies the adjacent exchanges of the profile, there is no need to centrally manage the station identification data in the home station 11. Therefore, data management becomes easy.

Embodiment 6 FIG. In the fifth embodiment, the destination of the profile notification from the switching center 10 is the directly adjacent switching center. On the other hand, in the sixth embodiment, the destination of the profile notification from the exchange 10 is the home station 11 and the station identification data of the adjacent exchange is transmitted to the home station 11.
, The home station 11 notifies the profile to the adjacent exchange.

According to this configuration, it is not necessary for the home station 11 to centrally manage the station identification data, so that the data management becomes easy. In addition, when there are a large number of adjacent exchanges, it is not necessary to transmit the number of call setup messages corresponding to the number of the adjacent exchanges from the exchange 10 to the home station 11. Therefore, communication traffic can be kept low.

Other Embodiments Hereinabove, six embodiments of the present invention have been described. However, it goes without saying that the present invention can adopt other embodiments. For example, in the above embodiment, a case is described in which the present invention is applied to an office PHS system. However, the invention is based on P
It can be easily applied to other mobile communication systems such as a cellular phone system such as DC and GSM and a general PHS system.

In the above embodiment, the home station 11 is described as one station. However, for example, the home station 11 may be composed of two stations: an exchange that executes exchange control, and a management station that is connected to the exchange and has a profile holding function, a profile notification function, and a location management function. .

Further, in the above embodiment, the case where each cell D is one position registration area is taken as an example. However, in the first, third, fourth and sixth embodiments, for example, the jurisdiction area H of the exchange 10 may be set as one location registration area.

[0105]

As described above, according to the present invention, a profile required for authentication of a mobile station is notified in advance only to an adjacent exchange, so that a profile notification is performed to all exchanges. Traffic can be greatly reduced. Therefore, a processing delay due to traffic congestion can be avoided. Also, the processing of the home station is simplified.
Therefore, it is possible to provide a mobile communication switching system and a mobile communication home station with improved system efficiency.

Further, when the profile notification is performed only to the adjacent exchange located in the moving direction of the mobile station, the traffic can be further reduced. Therefore, the processing delay can be avoided more favorably, and the processing of the home station can be further simplified. Therefore, a mobile communication switching system and a mobile communication home station with further improved system efficiency can be provided.

Further, when the switching center notifies the home station of the adjacent switching center information, the home station does not need to centrally manage the adjacent switching center information. Therefore, data management is simplified.

Furthermore, in the case where the result of the authentication calculation required for executing the handover is notified to the adjacent exchange in advance each time the handover is executed, even when the mobile station moves to the adjacent area during communication, Handover can be performed smoothly and at high speed. Therefore, a mobile communication system such as a private mobile communication system with improved communication quality can be provided.

Further, only at the time of a handover performed when the mobile station enters a boundary cell of an area under the control of the own station, the authentication calculation result obtained from the mobile station at the time of executing the handover is notified to the home station. Can reduce the traffic as compared with the case of notifying each time a handover is performed. Therefore, a mobile communication system such as a private mobile communication system with improved system efficiency can be provided.

[Brief description of the drawings]

FIG. 1 is a business-use PHS according to Embodiment 1 of the present invention.
It is a block diagram showing the whole system composition.

FIG. 2 is a sequence diagram illustrating a profile notification process according to the first embodiment.

FIG. 3 is a sequence diagram illustrating a profile notification process when a jurisdiction area is changed in the first embodiment.

FIG. 4 is a sequence diagram illustrating a profile notification process according to a second embodiment of the present invention.

FIG. 5 is a sequence diagram illustrating a profile notification process according to a third embodiment of the present invention.

FIG. 6 is a sequence diagram illustrating a profile notification process according to a fourth embodiment of the present invention.

FIG. 7 is a business-use PHS according to Embodiment 5 of the present invention.
It is a block diagram showing the whole system composition.

FIG. 8 is a diagram showing station identification data according to the fifth embodiment.

FIG. 9 is a sequence diagram illustrating a profile notification process according to a fifth embodiment.

[Explanation of symbols]

2 mobile station, 3a, 3b, 3c, 4a, 4b, 4c, 5
a, 5b, 5c, 6 base stations, 7, 8, 9, 10 switching stations, 11 home stations, 12 home memories, 13, 2
0, 21, 22 station memory, 14, 15, 16 memory.

Claims (9)

[Claims] An exchange that executes exchange control of communication performed by mobile stations in its own area and executes authentication processing of the mobile station based on a profile of the mobile station. It has a function to execute, a function to hold a profile of the mobile station, a function to notify the exchange to the held profile, and a function to manage the location of the mobile station. And a home station for notifying, when requested, a profile of the mobile station subject to the location registration to only an exchange adjacent to the exchange requesting the location registration. system. 2. The mobile station according to claim 1, wherein the exchange notifies the home station of travel direction information on a travel direction of the mobile station, and the home station transmits the travel direction information notified by the exchange. A mobile communication switching system characterized in that the profile is notified only to an adjacent switching station existing in a moving direction of the mobile station specified based on the profile. 3. The home station according to claim 1, wherein the home station holds adjacent exchange information on adjacent exchanges of the exchange, and requests location registration based on the held adjacent exchange information. An exchange system for mobile communication, characterized in that it identifies an exchange adjacent to the exchange that has been performed. 4. An exchange that executes exchange control of communication performed by mobile stations in its own area and executes authentication processing of the mobile station based on a profile of the mobile station. A mobile communication switching system including a function to execute, a function to hold a profile of a mobile station, a function to notify the switching station of the held profile, and a home station having a function to manage the position of the mobile station. The home station, when a location registration of the mobile station is requested from the exchange, notifies the profile of the mobile station of the location registration target to the exchange that has requested the location registration. The exchange has adjacent exchange information about the adjacent exchange, and when a location registration is requested from the mobile station after the profile is notified from the home station, The home station is configured to notify the home station of the above-mentioned profile with the held adjacent exchange information as a destination, and the home station transmits to the adjacent exchange identified based on the adjacent exchange information which is the destination. A mobile communication switching system, wherein only the profile is notified. 5. The method according to claim 1, wherein
The exchange, during communication, notifies the home station of an authentication calculation result obtained from the mobile station at the time of executing the handover every time the handover is executed. A mobile communication switching system, wherein when the calculation result is notified, the notified authentication calculation result is notified only to the adjacent exchange with the profile. 6. The method according to claim 1, wherein
The exchange has jurisdiction over an area including a plurality of cells. During communication, at the time of a handover performed when the mobile station enters a boundary cell of the area, an authentication calculation obtained from the mobile station at the time of executing the handover is performed. Notifying the result to the home station, the home station, when the authentication operation result is notified from the exchange, the notified authentication operation result together with the profile to the adjacent exchanges. A switching system for mobile communication, characterized in that only a notification is made. 7. A mobile communication home station that executes exchange control of communication performed by a mobile station, holds a profile necessary for authentication of the mobile station, and manages the position of the mobile station.
When updating the location registration of a mobile station, the profile of the mobile station whose location registration is to be updated is notified only to an exchange controlling the area adjacent to the area where the mobile station is located. Home station for communication. 8. The mobile communication home station according to claim 7, wherein the profile is notified only to the exchanges existing in the moving direction of the mobile station among the exchanges. 9. A mobile station, a plurality of local base stations that form a relatively small cell and perform wireless communication with a mobile station existing in the own station cell, and a plurality of base stations are controlled. A plurality of premises for executing exchange control of communication performed by mobile stations in the own station area composed of cells formed by the target base station and executing authentication processing of the mobile station based on a profile of the mobile station. A plurality of private branch exchanges connected to the private branch exchange, a function of executing the exchange control of the communication, a function of retaining a profile of the mobile station, and a function of notifying the private exchange of the retained profile. And a function of managing the location of the mobile station, and further, when the location registration of the mobile station is requested by the private branch exchange, the profile of the mobile station to be registered is requested by the location registration. A private home exchange having a function of notifying only a private exchange adjacent to the local exchange that has been provided.