JP2000197101A - Position information system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a position information system where a mail function of a PHS portable terminal is utilized to display a position of itself and a position of an opposite party on its detection section in terms of character information. SOLUTION: The position information system consists of a PHS service center SC, plural base stations CS1, CS2 and a PHS portable terminal PS1. Every time the PHS portable terminal PS1 hands off, the PHS portable terminal PS1 transmits data consisting of an ID being an identifier of the PHS portable terminal PS1 and an ID being an identifier of the base station CS1 to the PHS service center SC, an the PHS service center SC stores the data. Upon the receipt of a service request from the PHS portable terminal PS1 to inform current position information, the PHS service center SC transmits a location of the PHS base station CS1 to the PHS portable terminal PS1 via the PHS base station CS as the current position information on the basis of newest data. Thus, the PHS portable terminal PS1 displays the received current position information on its detection section in terms of characters.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a location information system, and more particularly to a location information system using a mail function of a PHS portable terminal.

[0002]

2. Description of the Related Art There has been a position information system using a mail function of a PHS portable terminal. As a first example of such a position information system, for example, there is a "position information system" shown in FIG. In FIG. 5, when the PHS portable terminal PS is within the service area of the PHS cell site CS, the PHS portable terminal PS located in the subscriber's home via the PHS cell site CS, the PHS carrier station SP, and the telephone line TL. The line is connected to the master unit MS of the terminal PS. The PHS portable terminal PS can receive a location information search service for notifying the parent device MS of the location of the connected PHS cell site CS as current location information.

[0003] To receive this service, the PHS carrier station SP determines the location of the PHS cell site CS to which the PHS portable terminal PS is connected, by using the PHS portable terminal PS.
As current position information (position information based on the PHS function). And the PHS operator station SP
The current position information is transmitted to the parent device MS via the telephone line TL. In the master unit MS, the current position information (P
Based on the HS information (position information based on the HS function), the information is displayed on a display unit (not shown). In this case, the data may be transmitted to a facsimile facsimile located in the subscriber's house instead of the display of the parent machine MS and output in paper. Therefore, for example, even if a child or an elderly with dementia carrying the PHS portable terminal PS goes missing, the current position can be immediately checked on the master unit MS side.

As a second example, Japanese Patent Application Laid-Open No. H10-17
There is a "mobile destination guidance system" disclosed in Japanese Patent No. 8674. In this system, a mobile terminal of a portable cellular phone PHS transmits a service request relating to the current location of the mobile terminal and a base station ID to a service center via a base station and an exchange, and the service center responds to the request, and Based on the station ID, map information relating to the vicinity of the current location of the PHS mobile terminal is searched and transmitted to the mobile terminal. According to this system, since there is no need to store map information on the user side, there is no need for a large-capacity storage device, and there is no need to update map information on the user side. It can be small and portable at all times.

As a third example, Japanese Patent Application Laid-Open No. 9-322
No. 253 discloses a “position detection system”. In this system, a searcher carries a PHS for position detection with a searcher, and a searcher calls a PHS for position detection from the PHS for general call, and after the PHS for position detection arrives, stores the stored CSID for the general call. Send data to PHS,
The PHS for a general call displays the received CSID. According to this system, PHS for general calls
To CSID of base station zone where PHS for position detection is located
Can be detected, and the position of the person to be searched can be easily detected without infringing the privacy by using the PHS service system that serves a wide area.

A fourth example is disclosed in Japanese Patent Application Laid-Open No. 8-265.
No. 826, there is a "method and apparatus for displaying the current position of a simplified portable telephone terminal". This is PHS
In a mobile phone, a mobile terminal uses a CS-I broadcast as broadcast information to make the base station recognize the base station.
It receives the D number, extracts the position information from the CS-ID number, and displays it on the display unit of the portable terminal. According to this technology, a complicated process of making a position inquiry to a wireless base, determining the strength of a signal received at the base station by a mobile communication control device, and sending the strongest base station position information to a mobile phone terminal. The current position can be displayed only on the terminal without stepping on.

[0007]

However, the above-mentioned conventional position information systems have the following problems. That is, in the first example, since the base unit to which the current position information of the PHS mobile terminal is notified is fixed, the base unit cannot track the PHS mobile terminal while checking the current position information. . In the second example, PHS
Since the current location of the mobile terminal is displayed in the form of map information, it includes extra information, and it takes time to transmit and display the information.
Further, in the third example, in order to detect the position of the PHS (located person) for position detection, it is necessary to call the PHS for position detection. And it is practically difficult to target infants and the elderly as seekers. In the fourth example, when displaying the position of the user's own mobile phone terminal, a map stored in the memory is called, and a search operation for applying the current position to the map is performed. Such a problem arises.

It is an object of the present invention to provide a position information system which allows the user to know his / her own position and the position of a partner by character display using the mail function of the PHS portable terminal.

[0009]

In view of the above-mentioned object,
According to the first aspect of the present invention, a PHS service center, a plurality of PHS base stations, a first PHS portable terminal to be tracked by a location information search service of the PHS service center, and a second PHS mobile terminal receiving a location information search service PHS mobile terminal, and each time the first PHS mobile terminal performs a handoff, the first PHS base station transmits the first PHS base station from the PHS base station after the handoff.
Data including the identifier of the HS mobile terminal and the identifier of the PHS base station is transmitted to the PHS service center,
When there is a request to know the location information from the second PHS portable terminal, the PHS service center transmits the data stored in the PHS service center to the second PHS service center.
The data is transmitted to the mobile terminal, and the current position information of the first PHS mobile terminal based on the data can be displayed as characters on the display unit of the second PHS mobile terminal. Therefore, PH
The S portable terminal can obtain the current position information as character information only by making a service request to the PHS service center.

According to a second aspect of the present invention, in the position information system according to the first aspect, the first PHS portable terminal and the second PHS portable terminal are constituted by the same terminal,
It is possible to display the current position information of the user on the display unit in characters. Therefore, when the current position of the PHS portable terminal is unknown, the holder of the PHS portable terminal can receive a service of acquiring the position information as character information.

According to a third aspect of the present invention, in the location information system according to the first aspect, the first PHS portable terminal and the second PHS portable terminal are subscribers of a location information search service of a PHS service center. It is composed of a plurality of terminals that have performed group registration, and the current position information of the first PHS mobile terminal can be displayed in characters on the display unit of the second PHS mobile terminal. Therefore, when the current location of a group-registered partner becomes unknown, the PHS mobile terminal holder can simply request a service to the PHS service center without calling the partner, and the current position information of the partner is converted to text information. Can be obtained at

According to a fourth aspect of the present invention, in the position information system according to the third aspect, each of the plurality of terminals can be any one of a first PHS portable terminal and a second PHS portable terminal. Thus, it is possible to mutually display the current position information of the self and the other party in characters. Therefore, when the holders of the mutual PHS portable terminals want to know the current position of themselves or the other party, by making a service request, the position information can be obtained as character information.

According to a fifth aspect of the present invention, in the position information system according to any one of the first to fourth aspects, P
The HS service center transmits the history of the current location information of the first PHS mobile terminal to the second PHS mobile terminal,
The PHS portable terminal can display the received history of the current position information of the first PHS portable terminal in characters on its display unit. Therefore, the first P to be tracked
It is possible to confirm the direction of movement of the HS portable terminal, to know in which direction to go from the current position to the destination, or to guide the other party.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, as a first embodiment of the present invention, a position information system which allows a user of a PHS portable terminal to know his / her current position will be described with reference to FIGS. .

FIG. 1 is a schematic configuration diagram showing a position information system according to a first embodiment of the present invention. In FIG.
The location information system includes a PHS portable terminal PS1, a plurality (two in this example) of PHS base stations CS1 and CS2,
Digital Network (ISDN / PSTN) SN,
And a PHS service center (service company) SC. Note that in the first embodiment, PH
The first PHS mobile terminal to be tracked by the location information search service of the S service center SC and the second PHS mobile terminal receiving the location search service are composed of the same terminal, and the current position information of the self is displayed on the display unit. D can be displayed as a character.

Each of the base stations CS1 and CS2, the digital network (ISDN / PSTN) SN, and the PHS service center (service company) SC constitute a PHS network. The PHS portable terminal PS1 uses this P
It is possible to communicate with another PHS portable terminal (not shown) or another telephone via the HS network, and to display character information on the display unit D by a mail function.

The PHS portable terminal PS1 automatically selects the most suitable PHS base station to connect to the PHS network. However, in a call while moving, the PHS base station suitable for connection may change.
In such a case, another PH while continuing the call
A "handoff" process for automatically connecting to the S base station is performed. This “handoff” is specifically performed as follows.

First, the PHS portable terminal PS1 transmits a handoff request to the PHS network when the level is lowered or the reception quality is deteriorated during a call while moving.
The PHS network recognizes that this call is being made during a call, and then connects to the call request. Thereby, the PH connected to the PHS portable terminal PS1 is
The S base station changes, and the call situation is improved.

When the "hand-off" process is performed, each PHS base station connected to the PHS portable terminal PS1 after the hand-off performs a call to the PHS portable terminal PS1, which is an identifier of the PHS portable terminal PS1.
The data including the ID and the CS-ID that is the identifier of the base station is transmitted to the PHS service center SC. PHS
The service center SC sequentially and historically stores data transmitted from each PHS base station in a database (not shown). The database includes a position information table including the CS-ID of each PHS base station and character information indicating the location (address) of the PHS base station corresponding to each CS-ID.

Further, the PHS portable terminal PS1 can perform subscriber registration of the location information search service of the PHS service center SC. This location information search service,
The PHS portable terminal PS1 whose subscriber has been registered has a PHS
When the user is within the service area of the base station, the location (address) of the connected PHS base station is used as the current location information from the PHS service center SC to the PHS portable terminal P.
This is a service notified to S1.

Next, an operation when the PHS portable terminal PS1 wants to know its current position will be described.

First, the PHS portable terminal P which has registered as a subscriber of the location information search service of the PHS service center SC
S1 initiates a request for service to the PHS network. In response to the request, the PHS service center SC, based on the latest data stored in the database, converts the character information indicating the current position obtained using the position information table from the CS-ID included in the latest data. , P
It is transmitted as position data together with the PS-ID of the HS portable terminal PS1.

The position data transmitted from the PHS service center SC is transmitted to the PHS portable terminal PS1 via the PHS base station. The PHS portable terminal PS1 displays character information indicating the current position included in the received position data on the display unit D in characters. The user (owner) of the PHS portable terminal PS1 can confirm his / her current position by receiving this service when he / she cannot find the place where he / she is while moving.

Next, the above communication operation will be described with reference to the sequence diagram shown in FIG. In FIG. 2,
Thin arrows indicate control channels, and thick arrows indicate speech channels.

In FIG. 2, the PHS portable terminal PS1 is
When moving from the service zone of the previously connected PHS base station (not shown) to the service zone of the PHS base station CS1, it sends out a handoff request signal to the PHS base station CS1 using the control channel. PHS base station CS1
Returns a signal instructing handoff to the PHS portable terminal PS1 using the control channel.

When the handoff process is completed, the PHS base station CS1 connected after the handoff is connected to the PHS mobile terminal P.
PS1-ID which is an identifier of S1 and PHS base station CS1
Data consisting of CS1-ID which is an identifier of
Notify the S service center SC. The PHS service center SC sends the notified PS1-ID and CS1-ID
Is stored in the database.

The PHS portable terminal PS1 moves further,
PHS base station CS2 from service zone of base station CS1
When the mobile station moves to the service zone, the mobile station issues a handoff request signal to the PHS base station CS2 using the control channel.
In response, PHS base station CS2 returns a signal instructing handoff to PHS portable terminal PS1 using the control channel.

When the handoff process is completed, the PHS base station CS2 connected after the handoff is connected to the PHS portable terminal P2.
The service center SC is notified of data including PS1-ID which is the identifier of S1 and CS2-ID which is the identifier of the base station CS2. The database of the service center SC stores the data composed of the notified PS1-ID and CS2-ID into the previously stored PS1-ID and CS1-ID.
It is stored historically following the data consisting of the ID.

As described above, every time the handoff process is performed, PS1-ID which is the identifier of the PHS portable terminal PS1 and CS-I which is the identifier of each PHS base station are automatically set.
D and PHS service center S
C is historically stored in the C database.

Therefore, when the PHS portable terminal PS1 wants to confirm the current position while moving, it transmits a call for the position information search service to the PHS service center SC via the PHS base station CS. The PHS portable terminal PS1 is then connected to the currently connected PHS base station, eg, PHS
It sends its location information request to the PHS service center SC using the communication channel via the base station CS2.

In response to a request from the PHS portable terminal PS1, the PHS service center SC retrieves the movement history of the PHS portable terminal PS1 based on the data stored in the database. As a result of the search, the PHS service center SC determines the CS-ID included in the latest data of the history stored in the database, that is, the CS2-ID of the PHS base station CS2 with which the PHS mobile terminal PS1 is currently communicating. Character information representing the location (address) of the PHS base station CS2 obtained using the location information table based on the ID is transmitted to the PS1-I of the PHS portable terminal PS1.
Along with D, the data is transmitted as a position data using a communication channel.

The position data from the PHS service center SC is transmitted to the PHS portable terminal P via the PHS base station CS2.
It is transmitted to S1. The PHS portable terminal PS1 displays, on the display unit D, character information indicating the location (address) of the PHS base station CS2 included in the received position data. This display indicates that the user of the PHS portable terminal PS1 is at the current location of the base station CS2 (that is, somewhere in the service zone of the base station CS2).

Next, the PHS service center SC
A disconnection signal is sent to PHS portable terminal PS1 via PHS base station CS2, and the call is disconnected.

As described above, the user of the PHS portable terminal PS1 confirms his / her current location by requesting a location information search service when, for example, he / she cannot arrive at a meeting place with a friend or has no partner. Can be.

In the above example, the PHS portable terminal PS
The operation of displaying only the current position of No. 1 has been described. However, if there is a request for the location information search service from the PHS portable terminal PS1, the service center SC
Is the PHS portable terminal PS stored in the database
One movement history is transmitted for a predetermined time (for example, the time up to 30 minutes before) or for a predetermined number (for example, 5), and the PH is transmitted.
You may make it display on the display part D of S portable terminal PS1.

With this display, for example, in the above example,
The PHS portable terminal PS1 has a current location of the PHS base station CS.
2 and the previous location is the PHS base station CS1
You can see that was the location of. PHS at handoff
The PHS base station connected to the mobile terminal PS1 is not limited to the PHS base station closest to the position of the PHS mobile terminal PS1, and a communication channel is selected from a plurality of PHS base stations having overlapping service zones. Another vacant PHS base station may be connected preferentially. In this case, the user of the PHS portable terminal can estimate his / her current position by displaying the movement history. In addition, based on the display of the movement history, the user of the PHS mobile terminal can recognize the direction in which he or she is traveling. For example, if the user is out of the direction of the destination, the user can correct the movement in the correct direction. it can.

Next, as a second embodiment of the present invention, a position information system for displaying a current position of one of a plurality of terminals which have registered a subscriber group of a position information search service on a display unit of the other terminal. Will be described with reference to FIGS.

FIG. 3 is a schematic configuration diagram showing a position information system according to a second embodiment of the present invention. Note that, in FIG. 3, the same components as those in FIG.
The detailed description may be omitted. In FIG.
The location information system includes a plurality (two in this example) of PHSs.
It comprises mobile terminals PS1, PS2, a plurality (three in this example) of PHS base stations CS1, CS2, CS3, a digital network (ISDN / PSTN) SN, and a PHS service center (service company) SC. I have.

Each PHS base station CS1, CS2, CS3
And digital network (ISDN / PSTN) SN
And the service center (service company) SC
An S network is configured. PHS portable terminal PS
1, PHS2 can communicate with each other and another PHS portable terminal (not shown) or another telephone via this PHS network, and displays character information on the display unit D by a mail function. be able to.

The PHS portable terminals PS1 and PS2 transmit a handoff request to the PHS network when the level is lowered or the reception quality is deteriorated during a call while moving. The PHS network recognizes that this call is being made during a call, and then connects to the call request. Thereby, the PHS base station connected to the PHS portable terminals PS1 and PS2 is changed, and the call situation is improved.

When the "hand-off" process is performed, the PHS base stations connected to the PHS portable terminals PS1 and PS2 after the hand-off use the PS1-ID, which is the identifier of the PHS portable terminal PS1, and the identifier of the PHS base station, respectively. Data consisting of a certain CS-ID and PHS portable terminal P
Data composed of PS2-ID, which is the identifier of S2, and CS-ID, which is the identifier of the PHS base station, are respectively stored in the PH.
Send to S service center SC. The PHS service center SC sequentially and historically accumulates data transmitted from each PHS base station in a database (not shown). Database is CS-ID of each PHS base station
And a position information table including character information indicating the location (address) of the PHS base station corresponding to each CS-ID.

The PHS portable terminals PS1 and PS2 are
The subscriber group of the location information search service of the PHS service center SC can be registered. This location information search service is used in response to a service request from a PHS mobile terminal when one of the PHS mobile terminals registered in a subscriber group wants to confirm its current location. Location (address) of PHS base station
Is notified from the PHS service center SC to the PHS portable terminal as current position information. The operation in this case is the same as that of the first embodiment described above, and the description is omitted here.

Further, this location information search service uses one PHS mobile terminal among the PHS mobile terminals registered in the subscriber group.
The HS portable terminal can also confirm the current position of another PHS portable terminal registered in the same subscriber group. The operation in this case will be described below.

In FIG. 3, PHS portable terminals PS1, P
Suppose that S2 has registered a subscriber group of the location information search service of the PHS service center SC, and the PHS portable terminal PS2 wants to confirm the current location of the PHS portable terminal PS1.

First, the PHS portable terminal PS2 issues a request for a service to the PHS network. Upon receiving the request, the PHS service center SC determines whether the searcher (PHS mobile terminal PS2) and the searched person (PHS mobile terminal PS1) are registered in the same subscriber group.

If the searcher and the person to be searched are not registered in the same subscriber group, the service center SC rejects the request for the service and does not perform the subsequent search operation. If the searcher and the searched person are registered in the same subscriber group, the PHS service center SC proceeds to the next operation according to the request for the service.

For example, when a user buys or owns a plurality of PHS portable terminals, the plurality of PHS portable terminals are registered as belonging to the same subscriber group. Is what you do. At the time of such registration, in order to confirm the user to be registered, if the user is an individual, for example, it is necessary to show a health insurance card, and if the user is a corporation, for example, it is necessary to show a copy of the registry I do. The PHS service center SC accepts only a request for location information search between PHS mobile terminals registered in the same subscriber group, and requests such a service request from a PHS mobile terminal not registered in the subscriber group or a non-identical service request. A request for location information search between PHS portable terminals registered in the subscriber group is rejected.

If the searcher or the searched person is registered in the same subscriber group, the PHS service center SC
Performs a search of the movement history of the PHS portable terminal PS1 stored in the database in response to a request for a service.

As a result of the search, the PHS service center SC
Is the PHS portable terminal PS stored in the database
1 based on the latest data of the movement history of the PHS portable terminal PS2, the character information representing the current position of the PHS portable terminal PS1 obtained using the position information table from the CS-ID included in the latest data is used as the identifier of the PHS portable terminal PS2. PS2-ID
And transmitted as position data.

The position data transmitted from PHS service center SC is transmitted to PHS portable terminal PS2 via PHS base station CS3 to which PHS portable terminal PS2 is currently connected. The PHS portable terminal PS2 displays, on the display unit D, character information indicating the current position of the PHS portable terminal PS1 included in the received position data. PHS portable terminal PS
The user of No. 2 can confirm the current position of the PHS mobile terminal, for example, the PHS mobile terminal PS1 by receiving this service when the location of another PHS mobile terminal, for example, the PHS mobile terminal PS1, is unknown.

Next, the above communication operation will be described with reference to the sequence diagram shown in FIG. In FIG. 4,
Thin arrows indicate control channels, and thick arrows indicate speech channels.

In FIG. 4, the PHS portable terminal PS1 is
When moving from the service zone of the previously connected PHS base station (not shown) to the service zone of the PHS base station CS1, it sends out a handoff request signal to the PHS base station CS1 using the control channel. PHS base station CS1
Returns a signal instructing handoff to the PHS portable terminal PS1 using the control channel.

When the handoff process is completed, the PHS base station CS1 connected after the handoff,
PS1-ID which is an identifier of S1 and PHS base station CS1
Data consisting of CS1-ID, which is an identifier of
Notify the service center SC. The PHS service center SC accumulates the data including the notified PS1-ID and CS1-ID in the database.

When the PHS portable terminal PS1 moves further,
When moving from the service zone of the PHS base station CS1 to the service zone of the PHS base station CS2, the PHS base station C
A handoff request signal is issued to S2 using the control channel. In response, PHS base station CS2 returns a signal instructing handoff to PHS portable terminal PS1 using the control channel.

When the handoff process is completed, the PHS base station CS2 connected after the handoff is connected to the PHS portable terminal P2.
PS1-ID which is an identifier of S1 and PHS base station CS2
The data consisting of CS2-ID which is the identifier of PHS
Notify the service center SC. The database of the PHS service center SC stores the data composed of the notified PS1-ID and CS2-ID in the previously stored PS-ID.
Following the data consisting of 1-ID and CS1-ID, the data is accumulated historically.

As described above, every time the handoff process is performed, PS1 which is the identifier of the portable terminal PS1 is automatically set.
-Data composed of the ID and the CS-ID which is the identifier of each PHS base station is sequentially and historically stored in the database of the PHS service center SC.

Thus, the PHS portable terminal PS2
When it is desired to confirm the current position of the mobile terminal PS1, a request for a position information search service is transmitted to the PHS service center SC via the PHS base station CS3. Upon receiving the request, the PHS service center SC determines whether the searcher (PHS mobile terminal PS2) and the searched person (PHS mobile terminal PS1) are registered in the same subscriber group.

If the searcher and the person to be searched are not registered in the same subscriber group, the service center SC rejects the request for the service and does not perform the subsequent search operation.

When it is confirmed that the searcher (PHS mobile terminal PS2) and the searched person (PHS mobile terminal PS1) are registered in the same subscriber group, the service center SC responds to the request for the service. The history of the movement of the PHS portable terminal PS1 stored in the database is searched. When the PHS service center SC receives the service request call, the PHS service center SC transmits the search result to the base station CS3.
Via the PHS portable terminal PS2.

Next, the PHS portable terminal PS2 sends a position information request of the PHS portable terminal PS1 to the PHS service center SC using the communication channel via the currently connected PHS base station CS3.

In response to a request from the PHS portable terminal PS1, the PHS service center SC retrieves the movement history of the PHS portable terminal PS1 based on the data stored in the database. As a result of the search, the PHS service center SC determines the CS-ID included in the latest data of the history stored in the database, that is, the CS2-ID of the PHS base station CS2 with which the PHS mobile terminal PS1 is currently communicating. Character information representing the location (address) of the PHS base station CS2 obtained using the location information table based on the ID is stored in the PS2-I of the PHS portable terminal PS2.
Along with D, the data is transmitted as a position data using a communication channel.

The position data from the PHS service center SC is transmitted to the PHS portable terminal P via the PHS base station CS3.
S2 is transmitted. The PHS portable terminal PS2 displays, on the display unit D, character information indicating the location (address) of the PHS base station CS2 included in the received position data.

By this display, the user of the PHS portable terminal PS2 knows that the current position of the PHS portable terminal PS1 is the location of the base station CS2 (that is, somewhere in the service zone of the base station CS2).

Next, the PHS service center SC
A disconnection request is sent to the PHS portable terminal PS2 via the PHS base station CS3. In response to this request, the PHS portable terminal PS2 sends a disconnection signal to the service center SC via the base station CS3, and the call is disconnected.

As described above, when the user of the PHS portable terminal PS2 does not know the current position of the PHS portable terminal PS1, the user of the PHS portable terminal PS2 requests the position information search service to obtain the P
The current position of the HS portable terminal PS1 can be confirmed.

In the above example, the PHS portable terminal PS
The operation of displaying only the current position of No. 1 has been described. However, if the PHS portable terminal PS2 requests a location information search service, the service center SC
Is the PHS portable terminal PS stored in the database
One movement history is transmitted for a predetermined time (for example, the time up to 30 minutes before) or for a predetermined number (for example, 5), and the PH is transmitted.
You may make it display on the display part D of S portable terminal PS2. By this display, for example, in the above example, PHS
The mobile terminal PS1 knows that the current position is the location of the PHS base station CS2, and that the previous position is the location of the PHS base station CS1. Therefore, in this case, based on the display of the movement history, the user of the PHS portable terminal PS2 can recognize the direction in which the PHS portable terminal PS1 is traveling, and can track based on the direction.

Next, a specific example of use will be described. For example, of the two PHS mobile terminals PS1 and PS2 that have registered the subscriber group of the location information search service of the PHS service center SC, the child has the PHS mobile terminal PS1 and the mother has the PHS mobile terminal PS2. Assume that

When the child goes out with the PHS portable terminal PS1 and cannot find out where he is, the mother calls the PHS service center SC for the current location information of the PHS portable terminal PS1 from the PHS portable terminal SC2. I do. Accordingly, the PHS service center S
The current position information of the PHS portable terminal PS1 sent from C is displayed on the display unit of the PHS portable terminal PS2. The mother can go to the place while checking the current position of the PHS portable terminal PS1 displayed on the display section, for example, while urging the child not to move the place.
The mother is the displayed location, that is, the PHS portable terminal PS1
When you reach the service zone of the base station to which the child is connected, you can find out where the child is likely to be and find the child by listening to what the children can see around the building nearby. it can.

As another usage example, for example, PH
The two PHS portable terminals PS1, which have registered the subscriber group of the location information search service of the S service center SC,
It is assumed that, among the PS2s, the PHS portable terminal PS1 is worn by the elderly with dementia, and the searcher has the PHS portable terminal PS2.

In this case, if the demented elderly person goes missing for some reason, the investigator may use the PHS portable terminal PS.
2 to PHS service center SC PHS mobile terminal P
A call is made to request the current location information in S1. Accordingly, the PH sent from the PHS service center SC
The current location information of the S mobile terminal PS1 is the PHS mobile terminal PS
2 is displayed on the display unit. The searcher can search for the current location of the PHS portable terminal PS1 displayed on the display unit while checking the current location. In addition, when the demented elderly person is wandering instead of staying at the place, the searcher displays the movement history of the PHS portable terminal PS1 on the display unit,
While checking the direction of movement by looking at it, it is possible to find a destination and to protect the elderly with dementia by finding them.

As can be seen from the above two examples, in the present invention, the searcher does not display the current position of the searchee on the display unit of the fixed device as in the related art, but holds the searcher's current position. This is displayed on the display unit of the PHS mobile terminal, which is advantageous in that the search target can be searched for while moving.

Although the first and second embodiments of the present invention have been described above, the present invention is not limited to this, and various modifications and applications are possible.

For example, the current location information transmitted from the PHS service center SC can include not only the location (address) information of the PHS base station CS but also additional information such as the name of the nearest building.

Also, the person having the PHS portable terminal PS sends the position information on which direction to go from the current position to the destination by mailing the place where one wants to go to the PHS service center SC. And can be displayed on the display unit.

[0075]

According to the first aspect of the present invention, every time the PHS portable terminal performs a handoff, the PHS after the handoff is provided.
ID of PHS mobile terminal and I of PHS base station from base station
D is transmitted to the service center, and the data stored in the service center is transmitted to the PHS mobile terminal when there is a service request, and the data is displayed on the display of the PHS mobile terminal. The PHS portable terminal can obtain the current position information by character information only by making a service request.

According to the second aspect of the present invention, the current position information of the PHS portable terminal can be displayed in characters on the display unit. Then, by making a service request, the position information can be obtained as character information.

According to the third aspect of the present invention, the current position information of the other terminal is displayed as character information on one of the plurality of terminals that have registered the subscriber group of the position information search service. Since the display is possible, when the location of the partner is unknown, the location information can be known.

Further, according to the fourth aspect of the present invention, the plurality of terminals can be the searched side and the searched side, respectively, so that when the owner of either terminal wants to know the current position of the other party, And can also know their current location.

According to the fifth aspect of the present invention, the PH
The S service center transmits the history of the current location information of the PHS mobile terminal, and the PHS mobile terminal displays the received history of the current location information in text on its display unit, so that it is possible to confirm the moving direction. It is possible to know which direction to go from the current position to the destination.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram illustrating a position information system according to a first embodiment of the present invention.

FIG. 2 is a sequence diagram showing a communication operation in FIG.

FIG. 3 is a schematic configuration diagram illustrating a position information system according to a second embodiment of the present invention.

FIG. 4 is a sequence diagram showing a communication operation in FIG.

FIG. 5 is a schematic configuration diagram illustrating an example of a conventional position information system.

[Explanation of symbols]

 PS1 PHS mobile terminal PS2 PHS mobile terminal CS1 PHS base station CS2 PHS base station CS3 PHS base station SN Digital network (ISDN / PSTN) SC PHS service center

Claims (5)

[Claims] 1. A PHS service center and a plurality of PHs
An S base station, a first PHS mobile terminal to be tracked by the location information search service of the PHS service center,
A second PHS mobile terminal that receives the location information search service, and each time the first PHS mobile terminal performs a handoff, the PHS base station after the handoff identifies the identifier of the first PHS mobile terminal and When data including the identifier of the PHS base station is transmitted to the PHS service center, and when the data stored in the PHS service center is requested from the second PHS portable terminal to know its location information, It is possible to transmit from the PHS service center to the second PHS mobile terminal and display the current location information of the first PHS mobile terminal based on the data on the display unit of the second PHS mobile terminal. A position information system characterized by the following. 2. The first PHS portable terminal and the second PHS portable terminal are constituted by the same terminal, and are capable of displaying their own current position information on a display unit in characters. The position information system according to claim 1, wherein 3. The first PHS portable terminal and the second PHS portable terminal are composed of a plurality of terminals that have registered a subscriber group of a location information search service of the PHS service center, and 2. The position information system according to claim 1, wherein the current position information of the first PHS portable terminal can be displayed in characters on a display unit of the PHS portable terminal. 4. The plurality of terminals can be each of the first PHS portable terminal and the second PHS portable terminal, and respectively display their own and other party's current position information in characters. The position information system according to claim 3, wherein the position information system can be operated. 5. The PHS service center transmits a history of current location information of the first PHS mobile terminal to the second PHS mobile terminal, and the second PHS mobile terminal receives the first PHS mobile terminal. The position information system according to any one of claims 1 to 4, wherein the history of the current position information of the PHS portable terminal is displayed in characters on its display unit.