BACKGROUND OF THE INVENTION  
         [0001]    1. Field of the Invention  
           [0002]    The present invention relates to a system for providing the name of a location at which a cellular phone terminal unit is located.  
           [0003]    2. Description of the Prior Art  
           [0004]    Presently, PHS (Personal Handy-phone System) providers provide location information services for PHS terminal units using base station codes whose locations have been registered.  
           [0005]    On the other hand, in a cellular phone (e.g. PDC (Personal Digital Cellular) system based on ARIB RCR STD-27 (Association of Radio Industries and Businesses Research and development Center for Radio systems standard-27) and GSM (Global System for Mobile communication)), since the cell of each base station is relatively large, a location information service is not used. Thus, in a cellular phone system, a cellular phone unit should be equipped with an expensive means such as a GPS (Global Positioning System) receiver.  
         SUMMARY OF THE INVENTION  
         [0006]    An object of the present invention is to provide a system that allows the name of a location at which a cellular phone terminal unit is located to be provided at low cost.  
           [0007]    A first aspect of the present invention is a first location name server, comprising a database for storing peripheral information and location names that have been correlated each other as a plurality of sets, a means for transmitting a request for peripheral information to an objective cellular phone terminal unit when a request for the name of a location at which the object cellular phone terminal unit is located is received, a means for searching the database for the name of the location corresponding to peripheral information received from the objective cellular phone terminal unit corresponding to the request for the peripheral information, and a means for transmitting the obtained name of the location to a transmission source of the request therefor.  
           [0008]    A second aspect of the present invention is a second location name server of which the first location name server further comprises a means for receiving a set of peripheral information and a location name that have been correlated each other from a registering cellular phone terminal unit, and a means for registering the received set of peripheral information and a location name that have been correlated each other to the database.  
           [0009]    A third aspect of the present invention is a first system for providing the name of a location at which a cellular phone terminal unit is located, comprising the first location name server, and the objective cellular phone terminal unit, comprising a means for obtaining the peripheral information, a means for receiving a request for the peripheral information from the location name server, and a means for transmitting the peripheral information to the location name server when the request for the peripheral information is received from the location name server.  
           [0010]    A fourth aspect of the present invention is a second system of which the first system further comprises a location information console, comprising a means for transmitting the request for the name of the location at which the objective cellular phone terminal unit is located to the location name server, a means for receiving the obtained name of the location from the location name server, and a means for displaying the received name of the location.  
           [0011]    A fifth aspect of the present invention is a third system for providing the name of a location at which a cellular phone terminal unit is located, comprising the second location name server and the registering cellular phone terminal unit, comprising a means for obtaining peripheral information, a means for obtaining the name of a location, a means for correlating the obtained peripheral information and the obtained name of the location, and a means for transmitting a set of the peripheral information and the name of the location that have been correlated to the location name server.  
           [0012]    A sixth aspect of the present invention is a third location name server, comprising a database for storing peripheral information and location names that have been correlated each other as a plurality of sets, a means for receiving a request for the name of a location as a request containing peripheral information, a means for searching the database for the name of the location corresponding to the peripheral information contained in the request for the name of the location, and a means for transmitting the obtained name of the location to a transmission destination for the request of the name of the location.  
           [0013]    A seventh aspect of the present invention is a fourth location name server of which the third location name server further comprises a means for receiving a set of peripheral information and a location name that have been correlated each other from a registering cellular phone terminal unit, and a means for registering the received set of peripheral information and a location name that have been correlated each other to the database.  
           [0014]    An eighth aspect of the present invention is a fourth system for providing the name of a location at which a cellular phone terminal unit is located, comprising the third location name server and an objective cellular phone terminal unit, comprising a means for obtaining peripheral information, a means for transmitting a request for the name of a location as a request containing peripheral information to the location name server, and a means for receiving the obtained name of a location from the location name server.  
           [0015]    A ninth aspect of the present invention is a fifth system of which the fourth system further comprises a location information console, comprising a means for transmitting a request for the name of a location at which the cellular phone terminal unit is located as a request that does not contain peripheral information, a means for receiving the obtained name of the location from the cellular phone terminal unit, and a means for displaying the received name of the location.  
           [0016]    A tenth aspect of the present invention is a fifth system for providing the name of a location at which a cellular phone terminal unit is located, comprising the fourth location name server and the registering cellular phone terminal unit, comprising a means for obtaining peripheral information, a means for obtaining the name of a location, a means for correlating the obtained peripheral information and the obtained name of the location, and a means for transmitting a set of the peripheral information and the name of the location that have been correlated each other to the location name server.  
           [0017]    These and other objects, features and advantages of the present invention will become more apparent in light of the following detailed description of a best mode embodiment thereof, as illustrated in the accompanying drawings. 
       
    
    
     BRIEF DESCRIPTION OF DRAWINGS  
       [0018]    [0018]FIG. 1 is a conceptual schematic diagram showing the structure of a system for providing the name of a location at which a cellular phone terminal unit is located (this system may be sometimes referred to as location name providing system) according to an embodiment of the present invention;  
         [0019]    [0019]FIG. 2 is a block diagram showing the structure of the cellular phone terminal unit shown in FIG. 1;  
         [0020]    [0020]FIG. 3 is a block diagram showing the structure of a location name server shown in FIG. 1;  
         [0021]    [0021]FIG. 4 is a block diagram showing the structure of a location information console shown in FIG. 1;  
         [0022]    [0022]FIG. 5 is a sequence diagram for explaining a location name registering operation of the location name providing system according to an embodiment of the present invention; and  
         [0023]    [0023]FIG. 6 is a sequence diagram for explaining a location name informing operation of the location name providing system according to the embodiment of the present invention. 
     
    
     DESCRIPTION OF PREFERRED EMBODIMENT  
       [0024]    The present invention is a cellular phone terminal unit and cellular phone system that correlate peripheral information (report information and electric field level) that the cellular phone terminal unit measures and a location name (a location name such as OO railway station) that the user inputs. Such unit and system provide a location information service corresponding to the correlated information at low cost.  
         [0025]    [0025]FIG. 1 shows the overall structure of the system according to an embodiment of the present invention. In FIG. 1, the system comprises a cellular phone terminal unit  1 , a location name server  2 , and a location information console  3 . In the system, the location of the cellular phone terminal unit  1  is obtained. The location name server  2  compares the peripheral information of the cellular phone terminal unit that has been registered, with a location name that has been registered. The location information console  3  retrieves the location name of the cellular phone terminal unit. The cellular phone terminal unit  1 , the location name server  2 , and the location information console  3  are connected to the infrastructure of the conventional cellular phone system. The infrastructure of the cellular phone system of each communication provider has a base station  4  and a base station controlling device  5 . The base station  4  communicates with the cellular phone terminal unit  1  with a radio wave. The base station controlling device  5  controls the base station  4  and communicates with an external communication network. The external communication network is for example a telephone network, the Internet, or the like.  
         [0026]    In this example, it is assumed that the cellular phone terminal unit  1  has been registered with base station A. In addition, it is assumed that the cellular phone terminal unit  1  can receive radio waves transmitted from base station B and base station C. Moreover, it is assumed that base station A and base station B belong to communication provider A and that base station C belongs to communication provider B.  
         [0027]    [0027]FIG. 2 is a schematic diagram showing the structure of the cellular phone terminal unit  1  according to the present invention. The cellular phone terminal unit  1  comprises a radio portion  11 , a displaying device  12 , a keyboard  13 , a controlling portion  14 , and a memory  15 . The radio portion  11  communicates with a base station with a radio wave. The displaying device  12  is for example an LCD (Liquid Crystal Display) that displays information for the user. The keyboard  13  serves for inputting a user&#39;s command. The controlling portion  14  controls the radio portion  11 , the displaying device  12 , and the keyboard  13 . The memory  15  stores information used by the controlling portion  14 .  
         [0028]    [0028]FIG. 3 is a schematic diagram showing the structure of the location name server  2 . The location name server  2  comprises a network interface  21 , a storage device  22 , and a controlling portion  23 . The network interface  21  communicates with an external communication network. The storage device  22  is for example a magnetic storage device, a memory, and so forth that store data of a location name and peripheral information transmitted from a cellular phone terminal unit. The controlling portion  23  controls the network interface  21  and the storage device  22 .  
         [0029]    [0029]FIG. 4 is a schematic diagram showing the structure of the location information console  3  according to the present invention. The location information console  3  comprises a network interface  31 , a keyboard  32 , a displaying device  33 , a controlling portion  34 , and a memory  35 . The network interface  31  communicates with an external communication network. The keyboard  32  serves for inputting a user&#39;s command. The displaying device  33  is for example a CRT (Cathode Ray Tube) that displays information for the user. The controlling portion  34  controls the network interface  31 , the keyboard  32 , and the displaying device  33 . The memory  35  stores information used in the controlling portion  34 .  
         [0030]    Next, with reference to FIGS. 5 and 6, the operation of the present invention will be described. FIG. 5 is a flow chart showing an operation in which the user of the cellular phone terminal unit  1  registers a location name with the location name server  2 . FIG. 6 is a flow chart showing an operation in which the user of the location information service searches for the location of the cellular phone terminal unit  1 .  
         [0031]    Referring to FIG. 5, at step  41 , the user of the cellular phone terminal unit  1  registers “location name” (for example OO station, OO intersection, or the like) as the name of a location at which the cellular phone terminal unit  1  is located with the memory  15  using the keyboard  13  and the displaying device  12 . At step  42 , the cellular phone terminal unit  1  measures peripheral information thereof. In this example, the peripheral information is report information (system information) and electric field intensity (RSSI) of base station A, base station B, and base station C from which the cellular phone terminal unit  1  receives radio waves. The report information that identifies a base station is a combination of a communication frequency and color code that the base station uses. In this example, base station C is a base station that belongs to a non-subscription communication provider. However, report information of base station C can be received and the electric field intensity thereof can be measured. At step  43 , the cellular phone terminal unit  1  transmits data of “location name” obtained at step  41  and “peripheral information” obtained at step  42  to the location name server  2  through base station A.  
         [0032]    At step  44 , the network interface  21  of the location name server  2  receives data transmitted from the cellular phone terminal unit  1  at step  43 . At step  45 , the location name server  2  registers the received data with a database of the storage device  22 . At step  46 , the location name server  2  transmits a message representing that the data has been registered, to the cellular phone terminal unit  1 . At step  47 , the cellular phone terminal unit  1  knows that the data has been received and informs the user thereof.  
         [0033]    Next, with reference to FIG. 6, the location information obtaining operation of the location information console  3  operated by the user who uses the location information service will be described. At step  51 , the user of the location information service causes the location information console  3  to transmit a location name request containing the telephone number of an objective cellular phone terminal unit  1  to the location name server  2 . At step  52 , the location name server  2  receives the location name request. At step  53 , the location name server  2  makes a connection to the cellular phone terminal unit  1  corresponding to information of the telephone number and so forth contained in the location name request and transmits a peripheral information request to the cellular phone terminal unit  1 . At step  54 , the cellular phone terminal unit  1  receives the peripheral information request. At step  55 , the cellular phone terminal unit  1  measures the peripheral information thereof in the same manner as step  42 . At step  56 , the cellular phone terminal unit  1  transmits the peripheral information obtained at step  55  to the location name server  2 . At step  57 , the location name server  2  receives the peripheral information from the cellular phone terminal unit  1 . At step  58 , the location name server  2  compares the received peripheral information with all peripheral information stored in the database and obtains a location name that is correlated with peripheral information that is the closest to the received peripheral information from the database. At step  59 , the location name server  2  transmits the location name obtained at step  58  to the location information console  3 . At step  60 , the location information console  3  receives the location name from the location name server  2  and displays the received location name on the displaying device  33  for the user of the location information service.  
         [0034]    According to another embodiment of the present invention, the location information console  3  transmits a location name request to the cellular phone terminal unit  1 . The cellular phone terminal unit  1  obtains peripheral information thereof corresponding to the location name request.  
         [0035]    Thereafter, the cellular phone terminal unit  1  transmits a location name search request containing the obtained peripheral information to the location name server  2 . The location name server  2  searches the location name corresponding to the peripheral information transmitted from the cellular phone terminal unit  1  and transmits the obtained location name to the cellular phone terminal unit  1 . The cellular phone terminal unit  1  transmits the location name received from the location name server  2  to the location information console  3 .  
         [0036]    According to further embodiment of the present invention, a cellular phone terminal unit has a function of a PHS terminal unit. That is, the cellular phone terminal is a hybrid terminal functions as a cellular phone and as a PHS terminal. In this case, peripheral information measured by the PHS terminal unit function portion can be used as the above-described peripheral information. Thus, even if the user of the cellular phone terminal unit having the PHS terminal unit function has contracted a cellular phone company for only the cellular phone terminal unit and not for PHS terminal, he or she can obtain the location name.  
         [0037]    According to still further embodiment of the present invention, a cellular phone terminal unit may have a function of a location name server.  
         [0038]    According to another embodiment of the present invention, a cellular phone terminal unit may have a function of a location information console.  
         [0039]    According to further embodiment of the present invention, the cellular phone terminal unit  1  periodically measures peripheral information thereof and stores the measured peripheral information to the memory  15 . Corresponding to one peripheral information request (at steps  53  and  54 ), the cellular phone terminal unit  1  transmits a plurality of records of peripheral information stored in the memory  15  to the location name server (at steps  56  an  57 ). As a result, the user can know the history of locations where the cellular phone terminal unit  1  has been.  
         [0040]    As was described above, according to the present invention, the following effects can be obtained.  
         [0041]    According to the present invention, based on the infrastructure of the conventional cellular phone system, a location information service can be accomplished at low cost with a cellular phone terminal unit, a location name server, and a location information console.  
         [0042]    As a method for obtaining location information, using peripheral electric field and so forth, the location of a cellular phone terminal unit can be more accurately obtained than the radius of a cell. Thus, the location name can be more accurately obtained than the conventional location information service based on a location registration to a cell.  
         [0043]    Since report information and electric field information of base stations that belong to communication providers with which a user has no contract of subscription can be used, a location information service can be accomplished with higher accuracy than before.  
         [0044]    Since a proper name (for example, OO company, OO station, etc.) as a location name is registered, information can be conveniently provided to the user.  
         [0045]    When the location name server stores “peripheral information” and “location name” registered by a plurality of cellular phone terminal units, the user can obtain the location name of an unknown location.  
         [0046]    Since a conventional location information service using base station code, registered location information, and GPS measured data is not required, the service according to the present invention can be used even in a roaming service area.  
         [0047]    Although the present invention has been shown and described with respect to a best mode embodiment thereof, it should be understood by those skilled in the art that the foregoing and various other changes, omissions, and additions in the form and detail thereof may be made therein without departing from the spirit and scope of the present invention.
A location name server is disclosed, that comprises a database for storing peripheral information and location names that have been correlated each other as a plurality of sets, a means for transmitting a request for peripheral information to an objective cellular phone terminal unit when a request for the name of a location at which the object cellular phone terminal unit is located is received, a means for searching the database for the name of the location corresponding to peripheral information received from the objective cellular phone terminal unit corresponding to the request for the peripheral information, and a means for transmitting the obtained name of the location to a transmission source of the request therefor.