JP2010183268A - Message communication system, message communication method, terminal, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To transmit and receive messages by a near field communication system even if a common password is not set to terminals in advance. <P>SOLUTION: A message communication system has a server, and terminals which perform communications using the near field communication system not through networks of electric communication service providers. The terminal transmits location information that indicates the location of terminal to the server. Then, when receiving neighboring terminal information which indicates neighboring terminals in an area where communication is available with the terminal by the near field communication system and a common key necessary for communication by the near field communication system from the server, the terminal performs authentication using the received common key between neighboring terminals and itself, and transmits and receives messages by the near field communication system. When receiving the location information transmitted from the terminal, the server transmits neighboring terminal information based on the received location information to the terminal and generates a common key to transmit it to the terminal and the neighboring terminals. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a message communication system, a message communication method, a terminal, and a program for transmitting and receiving messages between terminals.

  Messages transmitted and received in message communications represented by e-mail and bulletin boards pass through bulletin board servers and mail servers on the Internet. In this case, a user who performs message communication transmits and receives messages via a network provided by a telecommunications carrier. Hereinafter, a network provided by a telecommunications carrier is simply referred to as a network.

  When message communication is performed via a network, a user is charged a network usage fee or the like corresponding to the amount of communication. In addition, through the network, there is a case where a time lag from when a message is transmitted to when the message is received may cause a gap in real time. Furthermore, a load is applied to resources on the network, for example, the network itself and a server for transferring messages. The adverse effects of passing through the network as described above occur even when there is a nearby party to perform message communication.

  Here, for example, Patent Literature 1 discloses a technique for acquiring information on a network while suppressing the message communication via the network as much as possible.

  In a system using the technology disclosed in Patent Document 1, a mobile terminal communicates with another mobile terminal existing near the terminal by a short-range communication method such as Bluetooth (registered trademark), and a representative mobile terminal To decide. Then, the representative mobile terminal acquires information from a server on the network, and distributes the acquired information to other mobile terminals existing near the terminal by a short-range communication method.

  If the system disclosed in Patent Literature 1 is used, the representative portable terminal is the only portable terminal that performs communication via the network. Therefore, the degree of the above-described adverse effects caused by passing through the network is reduced.

JP 2008-11038 A

  When communication is performed between a plurality of terminals by a short-range communication method such as Bluetooth, it is necessary to perform pairing between the plurality of terminals. Pairing means that each of the plurality of terminals generates a common key necessary for performing communication by the short-range communication method. This common key is used for mutual authentication to mutually authenticate the plurality of terminals.

  When this common key is generated, a password is required, and a common password must be set in advance in each of a plurality of terminals that perform communication using the short-range communication method.

  Therefore, near field communication methods such as Bluetooth have a problem that communication is not possible between terminals for which a common password is not set in advance.

  An object of the present invention is to provide a message communication system, a message communication method, a terminal, and a program capable of transmitting and receiving messages by a short-range communication method without setting a common password in the terminal in advance. .

In order to achieve the above object, the present invention provides:
A message communication system having a server and a terminal that performs communication by a short-range communication method not via a network of a telecommunications carrier,
The terminal transmits position information indicating a position where the terminal exists to the server, and thereafter, neighboring terminal information indicating a neighboring terminal existing in a range in which communication with the terminal by the short-range communication method is possible, When receiving from the server a common key necessary for performing communication by the near field communication method, after performing mutual authentication with the neighboring terminal using the received common key, by the near field communication method Send and receive messages,
Upon receiving the location information transmitted from the terminal, the server transmits the neighboring terminal information based on the received location information to the terminal, generates the common key, and generates the generated common key. The common key is transmitted to the terminal and the neighboring terminal.

Further, a message communication method in a message communication system having a server and a terminal that performs communication by a short-range communication method not via a network of a telecommunications carrier,
A process in which the terminal transmits position information indicating a position where the terminal exists to the server;
When the server receives the location information transmitted from the terminal, based on the received location information, a neighboring terminal indicating a neighboring terminal existing in a range in which communication with the terminal can be performed by the near field communication method A process of transmitting information to the terminal;
The server generates a common key necessary for performing communication by the short-range communication method, and transmits the generated common key to the terminal and the neighboring terminal;
When the terminal receives the neighboring terminal information and the common key transmitted from the server, the terminal performs mutual authentication with the neighboring terminal using the received common key, and then sends a message by the near field communication method. The process which transmits / receives.

In addition, a message communication method in a terminal that performs communication by a short-range communication method not via a telecommunications carrier network,
A process of transmitting position information indicating a position where the terminal exists to a server that generates a common key necessary for performing communication by the short-range communication method;
When neighboring terminal information indicating neighboring terminals existing in a range where communication with the terminal by the near field communication method is possible and the common key are received from the server, the neighboring key is used by using the received common key. Processing to transmit and receive messages by the short-range communication method after mutual authentication with the terminal.

In addition, a terminal that performs communication by a short-range communication method not via a network of a telecommunications carrier,
Sends location information indicating the location of the terminal to a server that generates a common key necessary for communication using the short-range communication method, and then enables communication with the terminal using the short-range communication method. When the neighboring terminal information indicating neighboring terminals existing in a certain range and the common key are received from the server, mutual authentication is performed with the neighboring terminals using the received common key, and the near field communication is performed. Sends and receives messages using the method.

In addition, in the terminal that performs communication by the short-range communication method without going through the network of the telecommunications carrier,
A function of transmitting position information indicating a position where the terminal exists to a server that generates a common key necessary for performing communication by the short-range communication method;
When neighboring terminal information indicating neighboring terminals existing in a range where communication with the terminal by the near field communication method is possible and the common key are received from the server, the neighboring key is used by using the received common key. And a function of transmitting and receiving messages by the short-range communication method after performing mutual authentication with the terminal.

  According to the present invention, the terminal transmits position information indicating the position where the terminal exists to the server. When the server receives the position information transmitted from the terminal, the server transmits neighboring terminal information indicating the neighboring terminal existing in a range in which communication with the terminal by the near field communication method is possible. Further, the server generates a common key necessary for performing communication using the short-range communication method, and transmits the common key to the terminal and a neighboring terminal of the terminal. And the said terminal transmits / receives a message, after performing mutual authentication with a neighboring terminal using the common key received from the server.

  For this reason, the terminal and the neighboring terminal can perform message transmission / reception by the short-range communication method without setting a common password in advance.

It is a block diagram which shows the structure of one Embodiment of the message communication system of this invention. It is a sequence diagram for demonstrating an example of operation | movement in the case of performing message communication in the message communication system shown in FIG. It is a block diagram which shows an example of a structure of the portable terminal shown in FIG.1 and FIG.2. It is a block diagram which shows an example of a structure of the message communication availability determination server with which ASP shown in FIG.1 and FIG.2 is provided. It is a sequence diagram which shows the input / output of the information in the portable terminal shown in FIGS. FIG. 5 is a sequence diagram showing input / output of information in the message communication availability determination server shown in FIGS. 1, 2, and 4. It is a flowchart for demonstrating operation | movement of the message communication system shown in FIGS. It is a flowchart for demonstrating operation | movement of the message communication system shown in FIGS. It is a sequence diagram for demonstrating the other example of operation | movement in the case of performing message communication in the message communication system shown in FIG. It is a block diagram which shows the structure of other embodiment of the message communication system of this invention. It is a sequence diagram for demonstrating an example of the operation | movement which performs message communication in the message communication system shown in FIG.

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

  FIG. 1 is a block diagram showing a configuration of an embodiment of a message communication system of the present invention.

  As shown in FIG. 1, the message communication system according to the present embodiment includes mobile terminals 10-1 to 10-n that are terminals, a base station 20, and an ASP (Application Service Provider) 40. The ASP 40 and the base station 20 are connected by a telephone network 30, and the base station 20 and the mobile terminals 10-1 to 10-n are connected by wireless communication.

  The ASP 40 includes a message communication availability determination server 41.

  The portable terminals 10-1 to 10-n have a function of performing communication using a short-range communication method. In addition, in this embodiment, a near field communication system is a communication system performed directly between the portable terminals 10-1 to 10-n without using a network provided by a telecommunications carrier. An example of this short-range communication method is Bluetooth.

  FIG. 2 is a sequence diagram for explaining an example of an operation when message communication is performed in the message communication system shown in FIG.

  First, the outline of the message communication system of this embodiment will be described with reference to FIGS. 1 and 2. Here, a case where the message transmission side is the mobile terminal 10-1 and the message reception side is the mobile terminal 10-2 will be described.

  As a premise for performing message communication in the present embodiment, it is assumed that the terminal information of the mobile terminals 10-1 to 10-n is registered in the ASP 40. The terminal information is information that can uniquely identify the mobile terminals 10-1 to 10-n, and is, for example, a mobile terminal name, a terminal ID (IDentification), and an address. For example, in the case of BlueTooth, the address is a BDA (Bluetooth Device Address) that is assigned to a terminal that can perform communication by Bluetooth and that can uniquely identify each terminal.

  In addition, registration of the terminal information to the ASP 40 may be performed, for example, by sending a document describing the terminal information to the ASP 40, and transmitting the terminal information from the portable terminals 10-1 to 10-n to the ASP 40. It may be done by doing.

  First, when starting the message communication, the mobile terminal 10-1 that is the message transmission side sends to the ASP 40 a location information registration request 101 that causes the ASP 40 to register location information indicating the location where the mobile terminal 10-1 is located. Send. The location information registration request 101 includes location information of the mobile terminal 10-1, and the location information is, for example, information registered in advance in the mobile terminal 10-1 by the user of the mobile terminal 10-1. is there. Note that the user of the mobile terminal 10-1 can arbitrarily re-register the location information registered in the mobile terminal 10-1.

  In the ASP 40 that has received the location information registration request 101 transmitted from the mobile terminal 10-1, the location information of the mobile terminal 10-1 included in the received location information registration request 101 is already registered. Are stored in association with the terminal information. Then, based on the location information of the mobile terminal 10-1 included in the received location information registration request 101, a neighboring terminal that is a mobile terminal that exists in a range in which communication with the mobile terminal 10-1 can be performed by the short-range communication method Is searched. Here, it is assumed that the mobile terminals 10-2 and 10-3 are neighboring terminals of the mobile terminal 10-1.

  Then, the neighboring terminal information 102 indicating the searched neighboring terminal is transmitted from the ASP 40 to the portable terminal 10-1. The neighboring terminal information 102 includes terminal information and position information of neighboring terminals.

  When the portable terminal 10-1 receives the neighboring terminal information 102 transmitted from the ASP 40, the portable terminal 10-1 selects the neighboring terminal that performs communication by the near field communication method from the neighboring terminals indicated by the received neighboring terminal information 102. -1 from the user. Hereinafter, the selected neighboring terminal is referred to as a selected neighboring terminal. Here, it is assumed that the mobile terminal 10-2 among the mobile terminals 10-2 and 10-3, which are neighboring terminals, is accepted as the selected neighboring terminal.

  Then, the connection request 103 for indicating the selected neighboring terminal and notifying that the selected neighboring terminal is to be communicated is transmitted from the portable terminal 10-1 to the ASP 40.

  The ASP 40 that has received the connection request 103 transmitted from the mobile terminal 10-1 generates a common key 104 that is necessary for communication between the mobile terminal 10-1 and the mobile terminal 10-2 using the short-range communication method. Is done.

  Then, the common key 104 generated from the ASP 40 is transmitted to each of the mobile terminals 10-1 and 10-2.

  The mobile terminal 10-1 that has received the common key 104 transmitted from the ASP 40 generates a communication start request 105 for notifying the start of communication by the near field communication method using the received common key 104. And the produced | generated communication start request | requirement 105 is transmitted to the portable terminal 10-2 by a near field communication system. The mobile terminal 10-1 can transmit the communication start request 105 to the mobile terminal 10-2 by identifying the mobile terminal 10-2 based on the terminal information included in the neighboring terminal information 102 received from the ASP 40. .

  The mobile terminal 10-2 that has received the communication start request 105 transmitted from the mobile terminal 10-1 has received the communication start permission 106 for notifying that the start of communication by the near field communication method is permitted, and has received the common key 104 is generated. And the communication start permission 106 produced | generated is transmitted to the portable terminal 10-1 by a near field communication system.

  Through the transmission / reception of the communication start request 105 and the communication start permission 106, mutual authentication between the mobile terminal 10-1 and the mobile terminal 10-2 is completed, and the mobile terminal 10-1 and the mobile terminal 10-2 are connected. The communication link is established.

  When the communication link is established, the portable terminal 10-1 and the portable terminal 10-2 perform transmission / reception of the message information 107 by the short-range communication method. The message information 107 is information in which the address of the portable terminal to which the message is transmitted is added to the message.

  When the transmission / reception of the message information 107 is completed, a position information deletion request 108 for deleting the position information of the portable terminal 10-1 stored in the ASP 40 is transmitted from the portable terminal 10-1 to the ASP 40.

  When the position information deletion request 108 transmitted from the portable terminal 10-1 is received, the ASP 40 deletes the stored position information of the portable terminal 10-1. Then, a position information deletion completion notice 109 for notifying that the position information of the mobile terminal 10-1 has been deleted is transmitted from the ASP 40 to the mobile terminal 10-1.

  The above is the outline of the message communication system according to this embodiment.

  Next, the configuration of the mobile terminal 10-1 shown in FIGS. 1 and 2 will be described.

  FIG. 3 is a block diagram illustrating an example of the configuration of the mobile terminal 10-1 illustrated in FIGS.

  As shown in FIG. 3, the portable terminal 10-1 shown in FIGS. 1 and 2 includes a control unit 11, a transmission / reception unit 12, a short-range communication transmission / reception unit 13, a display unit 14, and an input reception unit 15. And a message DB (Data Base) 16. The mobile terminals 10-2 to 10-n have the same configuration.

  The input receiving unit 15 is connected to the input device 50.

  The control part 11 controls operation | movement of the portable terminal 10-1, and the following is mentioned as typical operation | movement.

  (1) The location information registration request 101 is generated, and the generated location information registration request 101 is transmitted to the ASP 40 via the transmission / reception unit 12.

  (2) The neighboring terminal information 102 transmitted from the ASP 40 is received via the transmission / reception unit 12 and the terminal information of the neighboring terminal indicated by the received neighboring terminal information 102 is displayed on the display unit 14.

  (3) Receives selected neighboring terminal information that is output from the input accepting unit 15 and identifies the selected neighboring terminal. Then, the connection request 103 indicating the selected neighboring terminal identified by the received selected neighboring terminal information is transmitted to the ASP 40 via the transmission / reception unit 12.

  (4) When the common key 104 transmitted from the ASP 40 is received via the transmission / reception unit 12, a communication start request 105 is generated using the received common key 104, and the generated communication start request 105 is used for near field communication. The data is transmitted to the selected neighboring terminal via the transmission / reception unit 13.

  (5) When the communication start permission 106 transmitted from the selected neighboring terminal is received via the short-range communication transmitting / receiving unit 13, a screen for allowing the user to input a message is displayed on the display unit 14.

  (6) When a message output from the input receiving unit 15 is received, the received message is stored in the message DB 16. At the same time, the address of the selected neighboring terminal is added to the received message and transmitted as transmission message information to the selected neighboring terminal via the near field communication transmitting / receiving unit 13. The transmission message information is one of the message information 107 shown in FIG.

  (7) When the reply message information, which is the message information 107 transmitted from the selected neighboring terminal, is received via the short-distance communication transmitting / receiving unit 13, the message included in the received reply message information is stored in the message DB 16.

  (8) After transmitting the transmission message information to the selected neighboring terminal, if the reply message information from the selected neighboring terminal is not received even after a predetermined time has elapsed, the message stored in the message DB 16 is deleted. At the same time, a message transmission / reception end notification for notifying the end of communication is transmitted to the selected neighboring terminal via the short-range communication transmitting / receiving unit 13.

  (9) When information that is output from the input receiving unit 15 and indicates that communication with the selected neighboring terminal that has been performing message communication is terminated, the message stored in the message DB 16 is deleted. At the same time, a message transmission / reception end notification is transmitted to the selected neighboring terminal via the near field communication transceiver 13.

  (10) When information indicating that the communication using the short-range communication method is terminated, which is information output from the input receiving unit 15, is received, a position information deletion request 108 is transmitted to the ASP 40.

  The transmission / reception unit 12 mediates communication with the ASP 40.

  The short-range communication transceiver 13 mediates communication with the selected neighboring terminal using the short-range communication method.

  The display unit 14 displays terminal information of neighboring terminals indicated by the neighboring terminal information 102. Specifically, for example, the location where the neighboring terminal exists is plotted on a map or the like together with the mobile terminal name.

  The input receiving unit 15 receives an input of a selected neighboring terminal selected by the user of the mobile terminal 10-1 by operating the input device 50 from among the neighboring terminals displayed on the display unit 14. Then, the selected neighboring terminal information is output to the control unit 11. The input receiving unit 15 can also receive an input from one selected neighboring terminal, and can also receive an input from a plurality of selected neighboring terminals. The input reception unit 15 receives a message input by the user of the mobile terminal 10-1 operating the input device 50, and outputs the received message to the control unit 11. In addition, when the input receiving unit 15 receives a message indicating that the user of the mobile terminal 10-1 has finished the communication using the short-range communication method input by operating the input device 50, information indicating that is sent to the control unit 11. Output.

  The message DB 16 stores messages included in the message information 107 transmitted / received to / from the selected neighboring terminal.

  Next, the configuration of the message communication availability determination server 41 provided in the ASP 40 shown in FIGS. 1 and 2 will be described.

  FIG. 4 is a block diagram illustrating an example of the configuration of the message communication availability determination server 41 included in the ASP 40 illustrated in FIGS. 1 and 2.

  As illustrated in FIG. 4, the message communication availability determination server 41 illustrated in FIGS. 1 and 2 includes a control unit 42, a transmission / reception unit 43, and a position information DB 44.

  The control unit 42 controls the operation of the message communication availability determination server 41, and typical operations include the following.

  (1) The location information registration request 101 transmitted from the mobile terminals 10-1 to 10-n is received via the transmission / reception unit 43. Then, the position information included in the received position information registration request 101 is stored in the position information DB 44 in association with the already registered terminal information.

  (2) Based on the location information included in the location information registration request 101 transmitted from the mobile terminals 10-1 to 10-n, the vicinity of the mobile terminals 10-1 to 10-n that is the transmission source of the location information registration request 101 Whether the terminal exists is searched from the position information DB 44. If there is no neighboring terminal as a result of the search, a message indicating that is transmitted to the mobile terminals 10-1 to 10-n that are the transmission source of the location information registration request 101. The message transmitted in this case is, for example, a message such as “No corresponding terminal”. On the other hand, if there is a neighboring terminal, the terminal information and position information of the neighboring terminal are acquired from the position information DB 44. Then, the neighboring terminal information 102 including the acquired terminal information and position information is transmitted to the mobile terminals 10-1 to 10-n that are the transmission source of the position information registration request 101.

  (3) The connection request 103 transmitted from the mobile terminals 10-1 to 10-n is received via the transmission / reception unit 43. And common required when performing communication by the short-range communication method between the mobile terminals 10-1 to 10-n that are the transmission source of the received connection request 103 and the selected neighboring terminal indicated by the received connection request 103 A key 104 is generated. Then, the generated common key 104 is transmitted to the mobile terminals 10-1 to 10-n that are the transmission source of the connection request 103 and the selected neighboring terminal indicated by the received connection request 103.

  (4) The position information deletion request 108 transmitted from the mobile terminals 10-1 to 10-n is received. Then, the position information of the mobile terminals 10-1 to 10-n that are the transmission source of the received position information deletion request 108 is deleted from the position information DB 44 by issuing a delete command. Then, a position information deletion completion notification 109 is transmitted to the mobile terminals 10-1 to 10-n that are the transmission source of the position information deletion request 108.

  The transmission / reception unit 43 mediates communication with the mobile terminals 10-1 to 10-n.

  The position information DB 44 stores terminal information of the mobile terminals 10-1 to 10-n. Further, the location information of the mobile terminals 10-1 to 10-n included in the location information registration request 101 is stored in association with the terminal information.

  The base station 20 illustrated in FIG. 1 relays communication between the mobile terminals 10-1 to 10-n and the ASP 40.

  The operation when performing message communication in the message communication system configured as described above will be described below. Here, a case where the message transmission side is the mobile terminal 10-1 and the message reception side is the mobile terminal 10-2 will be described.

  First, the operation from when the portable terminal 10-1 shown in FIGS. 1 to 3 transmits the location information registration request 101 until the terminal information of the neighboring terminals is displayed will be described.

  FIG. 5 is a sequence diagram showing input / output of information in the portable terminal 10-1 shown in FIGS. FIG. 6 is a sequence diagram showing input / output of information in the message communication availability determination server 41 shown in FIGS. 1, 2, and 4. FIG. 7 is a flowchart for explaining the operation of the message communication system shown in FIGS. 1 to 4. After the mobile terminal 10-1 transmits the location information registration request 101, the terminal information of neighboring terminals is shown. The operation until is displayed.

  As a premise of this operation, it is assumed that the terminal information of the mobile terminals 10-1 to 10-n is registered in the position information DB 44 of the message communication availability determination server 41.

  First, the control unit 11 of the mobile terminal 10-1 transmits the position information registration request 101 to the message communication availability determination server 41 via the transmission / reception unit 12 (step S1).

  The control unit 42 of the message communication availability determination server 41 that has received the location information registration request 101 transmitted from the mobile terminal 10-1 via the transmission / reception unit 43 receives the mobile terminal 10-1 included in the received location information registration request 101. Is stored in the position information DB 44 (step S2).

  Next, the control unit 42 searches the position information DB 44 to determine whether there is a neighboring terminal of the mobile terminal 10-1 (step S3).

  As a result of the search in step S3, when there is a neighboring terminal of the mobile terminal 10-1, the control unit 42 acquires the terminal information and the position information 111 of the searched neighboring terminal from the position information DB 44.

  And the control part 42 transmits the neighboring terminal information 102 containing the terminal information acquired from position information DB44 and the positional information 111 to the portable terminal 10-1 via the transmission / reception part 43 (step S4).

  The control unit 11 that has received the neighboring terminal information 102 transmitted from the message communication availability determination server 41 via the transmission / reception unit 12 causes the display unit 14 to display the terminal information of the neighboring terminal indicated by the received neighboring terminal information 102 (Step S1). S5).

  On the other hand, as a result of the search in step S3, if there is no neighboring terminal of the mobile terminal 10-1, the control unit 42 transmits a message indicating that to the mobile terminal 10-1 via the transmission / reception unit 43 ( Step S6).

  The control unit 11 that has received the message transmitted from the message communication availability determination server 41 via the transmission / reception unit 12 displays the received message on the display unit 14 (step S7), and ends the process.

  Next, the operation when the mobile terminal 10-1 shown in FIGS. 1 to 3 transmits / receives a message after displaying the terminal information of the neighboring terminal will be described.

  FIG. 8 is a flowchart for explaining the operation of the message communication system shown in FIGS. 1 to 4, and shows the operation of transmitting and receiving messages after the mobile terminal 10-1 displays the terminal information of the neighboring terminals. ing.

  First, the input receiving unit 15 receives an input of a selected neighboring terminal selected by the user of the mobile terminal 10-1 operating the input device 50 from among the neighboring terminals displayed on the display unit 14 (step S21). . Here, it is assumed that the portable terminal 10-2 is selected as the selected neighboring terminal.

  The input receiving unit 15 that has received the input of the selected neighboring terminal outputs the selected neighboring terminal information 112 that identifies the mobile terminal 10-2 to the control unit 11.

  The control unit 11 that has received the selected neighboring terminal information 112 output from the input receiving unit 15 transmits a connection request 103 indicating the portable terminal 10-2 as the selected neighboring terminal to the message communication availability determination server 41 via the transmission / reception unit 12. (Step S22).

  The control unit 42 of the message communication availability determination server 41 that has received the connection request 103 transmitted from the mobile terminal 10-1 via the transmission / reception unit 43 is a short distance between the mobile terminal 10-1 and the mobile terminal 10-2. A common key 104 necessary for communication by the communication method is generated (step S23).

  And the control part 42 transmits the produced | generated common key 104 to the portable terminals 10-1 and 10-2 via the transmission / reception part 43 (step S24).

  The control unit 11 of the portable terminal 10-1 that has received the common key 104 transmitted from the message communication availability determination server 41 via the transmission / reception unit 12 generates a communication start request 105 using the received common key.

  And the control part 11 transmits the produced | generated communication start request | requirement 105 to the portable terminal 10-2 via the transmission / reception part 13 for near field communication.

  Here, the control unit 11 of the mobile terminal 10-2 that has received the communication start request 105 transmitted from the mobile terminal 10-1 uses the common key 104 transmitted from the message communication enable / disable determination server to allow communication start permission 106. Is generated.

  And the control part 11 of the portable terminal 10-2 transmits the produced | generated communication start permission 106 to the portable terminal 10-1 via the transmission / reception part 13 for near field communication.

  Thereby, the mutual authentication between the portable terminal 10-1 and the portable terminal 10-2 is completed, and the communication link between the portable terminal 10-1 and the portable terminal 10-2 is established (step S25).

  Next, the control unit 11 of the mobile terminal 10-1 causes the display unit 14 to display a screen for allowing the user to input a message.

  And the input reception part 15 receives the message 115 input by the user of the portable terminal 10-1 operating the input device 50 (step S26).

  The input receiving unit 15 that has received the input of the message 115 outputs the received message 115 to the control unit 11.

  The control unit 11 that has received the message 115 output from the input reception unit 15 stores the received message 115 in the message DB 16.

  Further, the control unit 11 adds the address of the portable terminal 10-2 to the received message 115, and transmits it as the transmission message information 107-1 to the portable terminal 10-2 via the short-range communication transmitting / receiving unit 13 (step). S27).

  If the transmission message information 107-1 is transmitted, the control part 11 will start a timer (step S28).

  And the control part 11 confirms the elapsed time after transmitting the transmission message information 107-1 (step S29).

  As a result of the confirmation in step S29, when the reply message information 107-2 including the message to the portable terminal 10-1 is not received from the portable terminal 10-2 even after a predetermined time has elapsed, the control unit 11 stores the message DB 16 in the message DB 16. The stored message transmitted to the portable terminal 10-2 is deleted (step S30).

  Further, the control unit 11 transmits a message transmission / reception end notification 113 to the portable terminal 10-2 via the short-range communication transmission / reception unit 13 (step S31).

  On the other hand, as a result of the confirmation in step S29, when the reply message information 107-2 transmitted from the portable terminal 10-2 is received within a predetermined time, the control unit 11 adds the received reply message information 107-2 to the received reply message information 107-2. The included message is displayed on the display unit 14 and stored in the message DB 16 (step S32).

  Next, the control unit 11 causes the display unit 14 to display a screen for selecting whether to continue communication with the mobile terminal 10-2.

  The input receiving unit 15 that has received a selection input by operating the input device 50 by the user of the portable terminal 10-1 outputs information indicating the selection content to the control unit 11.

  The control part 11 which received the information which shows the selection content output from the input reception part 15 determines whether communication with the portable terminal 10-2 is continued from the selection content which the information shows (step S33).

  If the communication with the mobile terminal 10-2 is not continued as a result of the determination in step S33, the operation proceeds to the operation of step S30, and the control unit 11 transmits / receives to / from the mobile terminal 10-2 stored in the message DB 16 Delete the message. In addition, the control unit 11 transmits a message transmission / reception end notification 113 to the mobile terminal 10-2 via the short-range communication transmission / reception unit 13.

  On the other hand, as a result of the determination in step S33, when the communication with the portable terminal 10-2 is continued, the operation transitions to step S26.

  Here, the control unit 11 of the mobile terminal 10-2 that has received the message transmission / reception end notification 113 transmitted from the mobile terminal 10-1 by the operation of Step S31 is stored in the message DB 16 and is connected to the mobile terminal 10-1. Delete messages sent and received by. And the control part 11 of the portable terminal 10-2 displays on the display part 14 the message which shows that the communication with the portable terminal 10-1 is complete | finished.

  Next, the control unit 11 of the mobile terminal 10-1 causes the display unit 14 to display a screen for selecting whether to communicate with other neighboring terminals.

  The input receiving unit 15 that has received a selection input by operating the input device 50 by the user of the portable terminal 10-1 outputs information indicating the selection content to the control unit 11.

  The control part 11 which received the information output from the input reception part 15 determines whether it communicates with another neighboring terminal from the selection content which the information shows (step S34).

  As a result of the determination in step S34, when communication with other neighboring terminals is not performed, the control unit 11 transmits a position information deletion request 108 to the message communication availability determination server 41 via the transmission / reception unit 12 (step S35).

  The control unit 42 of the message communication availability determination server 41 that has received the location information deletion request 108 transmitted from the mobile terminal 10-1 issues the delete command 114, thereby storing the mobile terminal 10-stored in the location information DB 44. 1 position information is deleted (step S35).

  The control unit 42 that has deleted the location information of the mobile terminal 10-1 transmits a location information deletion completion notification 109 to the mobile terminal 10-1 via the transmission / reception unit 43.

  On the other hand, if the result of determination in step S34 is to communicate with other neighboring terminals, the operation proceeds to step S21, and the input receiving unit 15 inputs the selection of the selected neighboring terminal from the user of the portable terminal 10-1. Accept.

  In the operation flow described above, the message transmission / reception end notification 113 can be transmitted from the portable terminal 10-2 to the portable terminal 10-1.

  Further, when the communication link is disconnected due to movement of the mobile terminals 10-1 to 10-n or the like while the message is being transmitted / received in the present embodiment, the display unit of the mobile terminals 10-1 to 10-n 14 displays a message for notifying that the message cannot be transmitted or received. In this case, the control unit 11 of the mobile terminals 10-1 to 10-n deletes the transmitted / received message stored in the message DB 16.

  As described above, in the present embodiment, the mobile terminals 10-1 to 10-n send the position information registration request 101 including the position information indicating the position where the mobile terminals 10-1 to 10-n exist to the message communication availability determination server. 41. Then, the message communication availability determination server 41 transmits the neighboring terminal information 102 indicating the neighboring terminal of the portable terminal 10-1 to 10-n that is the transmission source of the location information registration request, to the portable terminals 10-1 to 10-n. Further, the message communication availability determination server 41 generates a common key 104 necessary when performing communication by the short-range communication method, and selects the mobile terminals 10-1 to 10-n as the transmission source of the location information registration request 101 and the selection thereof. Send to neighboring terminals. Then, the mobile terminals 10-1 to 10-n that are the transmission sources of the location information registration request 101 transmit and receive messages after performing mutual authentication with the selected neighboring terminal using the received common key.

  Therefore, the mobile terminals 10-1 to 10-n can transmit and receive messages using the short-range communication method without setting a common password in advance in the mobile terminals 10-1 to 10-n.

  In addition, since the common key is centrally managed in the ASP 40, leakage of the common key can be avoided and security is improved.

  In the present embodiment, the location information of the mobile terminals 10-1 to 10-n is information registered in advance by the user as an example. As another example of the position information, there is a method in which the position of the base station that relays communication between the portable terminals 10-1 to 10-n and the ASP 40 is used as the position information of the portable terminals 10-1 to 10-n. is there. In this case, when the mobile terminals 10-1 to 10-n transmit the position information registration request to the ASP 40, the base station 20 adds the position where the base station 20 exists to the position information registration request and transmits the request to the ASP 40. Thereby, the user of the portable terminals 10-1 to 10-n does not need to register the position information in advance.

  FIG. 9 is a sequence diagram for explaining another example of the operation when performing message communication in the message communication system shown in FIG.

  As illustrated in FIG. 9, the mobile terminal 10-1 transmits a location information registration request 201 that does not include location information preset by the user.

  The base station 20 that has received the location information registration request 201 transmitted from the mobile terminal 10-1 adds information on the location where the base station 20 exists as location information to the received location information registration request 201. Then, the location information registration request 201 to which the location information is added is transmitted to the ASP 40 as a registration request 202 with base station location information. The subsequent operation is the same as that described with reference to FIG.

  Furthermore, as another example of the position information, when the mobile terminals 10-1 to 10-n are compatible with the GPS (Global Positioning System) function, the latitude and longitude acquired using the GPS function are used. There is a way. Thereby, the position of the neighboring terminal of the portable terminals 10-1 to 10-n can be grasped more accurately.

  FIG. 10 is a block diagram showing a configuration of another embodiment of the message communication system of the present invention.

  The message communication system shown in FIG. 10 is different from the message communication system shown in FIG. 1 in that a GPS satellite 150 is added.

  FIG. 11 is a sequence diagram for explaining an example of an operation for performing message communication in the message communication system shown in FIG.

  As illustrated in FIG. 11, the mobile terminal 10-1 acquires the latitude and longitude information 203 on which the mobile terminal 10-1 exists from the GPS satellite 150 before transmitting the position information registration request 301.

  Then, the acquired latitude and longitude information 203 is included in the position information registration request 301 as position information and transmitted to the ASP 40. The subsequent operation is the same as that described with reference to FIG. As the position information, any of the above-described three information, information preset by the user, information on the position where the base station 20 exists, latitude and longitude information acquired using the GPS function can be selected. May be.

  Further, in the above-described embodiment, the content of the message transmitted and received between the mobile terminals 10-1 to 10-n by the near field communication method is not confirmed, but the content of the message can be confirmed. It is also possible to do. In this case, for example, a monitoring unit that monitors words included in the message is provided in the mobile terminals 10-1 to 10-n, and prohibited words that are prohibited from being used in the message are registered in the monitoring unit in advance. Then, the monitoring unit detects whether or not the prohibited word is included in the message to be transmitted and received, and the message including the prohibited word may be discarded as necessary. In this case, not only the content of the message itself but also the content of an image file attached to the message may be confirmed.

  Moreover, in embodiment mentioned above, the case where the position where a neighboring terminal exists plotted on a map etc. with the name of the portable terminal was displayed on portable terminals 10-1 to 10-n as an example. In this way, not only the location and terminal information where the neighboring terminal exists, but also a communication history such as the number of times of transmission / reception of messages of the neighboring terminal is added to the neighboring terminal information 102, and the added communication history is You may make it display on portable terminal 10-1 to 10-n with the presence position of a terminal. In this case, the message communication availability determination server 41 needs to store a communication history as one piece of terminal information. By doing in this way, the user of the portable terminals 10-1 to 10-n having received the neighboring terminal information 102 can preferentially select a user who is likely to return a message as a selected neighboring terminal. become able to.

  Further, in the present invention, the processing in the terminal is recorded on a recording medium readable by the terminal, in addition to what is realized by the dedicated hardware described above, and this recording medium The program recorded in (1) may be read by a terminal and executed. The recording medium that can be read by the terminal refers to a removable recording medium such as a floppy disk, a magneto-optical disk, a DVD, and a CD, and an HDD built in the terminal.

10-1 to 10-n Mobile terminal 11, 42 Control unit 12, 43 Transmission / reception unit 13 Transmission / reception unit for near field communication 14 Display unit 15 Input reception unit 16 Message DB
20 base station 30 telephone network 40 ASP
41 Message communication availability determination server 44 Location information DB
50 Input devices 101, 201, 301 Location information registration request 102 Neighboring terminal information 103 Connection request 104 Common key 105 Communication start request 106 Communication start permission 107 Message information 107-1 Transmission message information 107-2 Reply message information 108 Position information deletion request 109 Position information deletion completion notification 110 Position information 111 Terminal information and position information 112 Selected neighboring terminal information 113 Message transmission / reception end notification 114 Delete command 115 Message 150 GPS satellite 202 Registration request with base station position information 203 Latitude and longitude information

Claims (15)

A message communication system having a server and a terminal that performs communication by a short-range communication method not via a network of a telecommunications carrier,
The terminal transmits position information indicating a position where the terminal exists to the server, and thereafter, neighboring terminal information indicating a neighboring terminal existing in a range in which communication with the terminal by the short-range communication method is possible, When receiving from the server a common key necessary for performing communication by the near field communication method, after performing mutual authentication with the neighboring terminal using the received common key, by the near field communication method Send and receive messages,
Upon receiving the location information transmitted from the terminal, the server transmits the neighboring terminal information based on the received location information to the terminal, generates the common key, and generates the generated common key. A message communication system for transmitting the common key to the terminal and the neighboring terminal. The message communication system according to claim 1.
When there are a plurality of neighboring terminals indicated by the neighboring terminal information, the terminal accepts a selection of a neighboring terminal that performs communication by the near field communication method from the plurality of neighboring terminals, and selects the selected neighboring terminal. A connection request indicating to the server, and then receiving the common key that is transmitted from the server and necessary for communication with the selected neighboring terminal using the short-range communication method. Sending and receiving messages by the near field communication method after mutual authentication with the selected neighboring terminal using a common key,
When the server receives the connection request transmitted from the terminal, the server generates the common key and transmits the generated common key to the terminal and the selected neighboring terminal. The message communication system according to claim 1 or 2,
The message communication system, wherein the position information is information indicating a latitude and longitude of a position where the terminal exists. A message communication method in a message communication system having a server and a terminal that performs communication by a short-range communication method not via a network of a telecommunication carrier,
A process in which the terminal transmits position information indicating a position where the terminal exists to the server;
When the server receives the location information transmitted from the terminal, based on the received location information, a neighboring terminal indicating a neighboring terminal existing in a range in which communication with the terminal can be performed by the near field communication method A process of transmitting information to the terminal;
The server generates a common key necessary for performing communication by the short-range communication method, and transmits the generated common key to the terminal and the neighboring terminal;
When the terminal receives the neighboring terminal information and the common key transmitted from the server, the terminal performs mutual authentication with the neighboring terminal using the received common key, and then sends a message by the near field communication method. A message communication method. The message communication method according to claim 4,
When there are a plurality of neighboring terminals indicated by the neighboring terminal information, the terminal accepts selection of neighboring terminals that perform communication by the near field communication method from the plurality of neighboring terminals, and selects the selected neighboring terminals. Processing to send a connection request indicating to the server;
When the server receives the connection request transmitted from the terminal, a common key necessary for communication by the near field communication method with the selected neighboring terminal indicated by the received connection request is obtained. Processing to generate and transmit the generated common key to the terminal and the selected neighboring terminal;
When the terminal receives the common key transmitted from the server, it performs mutual authentication with the selected neighboring terminal using the received common key, and then transmits / receives a message by the near field communication method. And a message communication method. In the message communication method according to claim 4 or 5,
The message communication method, wherein the position information is information indicating a latitude and longitude of a position where the terminal exists. A message communication method in a terminal that performs communication by a short-range communication method not via a network of a telecommunications carrier,
A process of transmitting position information indicating a position where the terminal exists to a server that generates a common key necessary for performing communication by the short-range communication method;
When neighboring terminal information indicating neighboring terminals existing in a range where communication with the terminal by the near field communication method is possible and the common key are received from the server, the neighboring key is used by using the received common key. A message communication method comprising: performing mutual authentication with a terminal and transmitting / receiving a message by the short-range communication method. The message communication method according to claim 7, wherein
When there are a plurality of neighboring terminals indicated by the neighboring terminal information, a selection of a neighboring terminal that performs communication by the near field communication method is received from the plurality of neighboring terminals, and a connection request indicating the selected neighboring terminal is received. Processing to send to the server;
Upon receiving a common key that is transmitted from the server and necessary for communication with the selected neighboring terminal using the near field communication method, the selected neighboring terminal is used by using the received common key. A message communication method further comprising: performing mutual authentication with the message and transmitting and receiving a message by the short-range communication method. In the message communication method according to claim 7 or 8,
The message communication method, wherein the position information is information indicating a latitude and longitude of a position where the terminal exists. A terminal that performs communication using a short-range communication method that does not go through a telecommunications carrier's network,
Sends location information indicating the location of the terminal to a server that generates a common key necessary for communication using the short-range communication method, and then enables communication with the terminal using the short-range communication method. When the neighboring terminal information indicating neighboring terminals existing in a certain range and the common key are received from the server, mutual authentication is performed with the neighboring terminals using the received common key, and the near field communication is performed. A terminal that sends and receives messages using a method. The terminal according to claim 10, wherein
When there are a plurality of neighboring terminals indicated by the neighboring terminal information, a selection of a neighboring terminal that performs communication by the near field communication method is received from the plurality of neighboring terminals, and a connection request indicating the selected neighboring terminal is received. When the common key that is transmitted to the server and then transmitted from the server and necessary for communication with the selected neighboring terminal by the near field communication method is received, the received common key is used. A terminal that performs mutual authentication with the selected neighboring terminal and transmits / receives a message by the short-range communication method. The terminal according to claim 10 or 11,
The location information is information indicating the latitude and longitude of the location where the terminal is present. To a terminal that communicates using a short-range communication method without going through the network of a telecommunications carrier,
A function of transmitting position information indicating a position where the terminal exists to a server that generates a common key necessary for performing communication by the short-range communication method;
When neighboring terminal information indicating neighboring terminals existing in a range where communication with the terminal by the near field communication method is possible and the common key are received from the server, the neighboring key is used by using the received common key. A program for realizing a function of transmitting and receiving a message by the short-range communication method after performing mutual authentication with a terminal. The program according to claim 13, wherein
In the terminal,
When there are a plurality of neighboring terminals indicated by the neighboring terminal information, a selection of a neighboring terminal that performs communication by the near field communication method is accepted from the plurality of neighboring terminals, and a connection request indicating the selected neighboring terminal is received. A function of transmitting to the server;
Upon receiving a common key that is transmitted from the server and necessary for communication with the selected neighboring terminal using the near field communication method, the selected neighboring terminal is used by using the received common key. And a function for further transmitting and receiving messages by the short-range communication method after mutual authentication. In the program according to claim 13 or 14,
The position information is a program that is information indicating a latitude and longitude of a position where the terminal exists.

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