JP5918312B2 - Communication terminal device - Google Patents

Description

  The present invention relates to a communication terminal apparatus capable of communicating via a communication network.

Conventionally, as this type of communication terminal device, a communication path (session) is established with a communication partner such as another communication terminal device using a global IP (Internet Protocol) address, and the communication partner is communicated by TCP / IP communication. A device that transmits / receives data to / from is known. In communication using such a global IP address (hereinafter abbreviated as “IP address” where appropriate), if the network segment of the connection destination changes due to movement of the communication terminal device, a new IP address is assigned to the communication terminal device. Is allocated, communication with the communication partner cannot be continued.
In Patent Document 1, when a network segment of a connection destination is changed due to movement or the like and a new IP address is assigned, information on the new IP address is sent to a communication partner by SMS (Short Message Service) or e-mail. A mobile portable terminal device that transmits and notifies is disclosed.

  When transmitting and notifying information on a new IP address to a communication partner as in the mobile portable terminal device disclosed in Patent Document 1, it takes some time until the information on the IP address reaches the communication partner. Cost. In particular, when the communication terminal device of the communication partner is located outside the service area where communication via the mobile communication network is not possible, or when a failure has occurred in the communication network used for transmitting IP address information, the IP address There is a possibility that it will be greatly delayed for the information of this to reach the communication partner. If the transmission of the new IP address information is delayed in this way and the new IP address is not used for communication, for example, the DHCP (Dynamic Host Configuration Protocol) server reuses the new IP address for another communication terminal device. There is a possibility that the communication partner that received the information on the new IP address with a delay will perform unintended communication with the other communication terminal device.

  The present invention has been made in view of the above problems, and its purpose is to establish a communication path for bidirectional communication with a communication partner based on the changed IP address when the IP address is changed. Provided is a communication terminal device capable of preventing unintended communication by a communication partner.

A communication terminal apparatus according to an aspect of the present invention is a communication terminal apparatus comprising: a first communication unit that communicates via a communication network; and a control unit that controls the first communication unit. The means establishes a communication path for bidirectional communication with the communication partner via the communication network based on a predetermined IP address and port number set for the communication terminal device and the communication partner, When the IP address of the communication terminal device is changed, connection information including the changed IP address and the port number of the communication terminal device used for bidirectional communication with the communication partner is transmitted to the communication partner. To control.
In the communication terminal device, when the IP address of the communication terminal device is changed, the control unit changes the port number on the communication terminal device side, and includes connection information including the changed IP address and port number. You may control so that it may transmit to the said communicating party.
In the communication terminal device, the control means stores the IP address and port number of the communication partner, and receives connection information including the IP address and port number of the communication partner from the communication partner. The IP address and port number of the communication partner may be updated based on the connection information.
Further, in the communication terminal device, the control means tries to return the communication path when the communication path for bidirectional communication with the communication partner is interrupted, and when the communication path fails to return, the communication partner Control may be performed so as to request connection information including the IP address and port number of the communication partner.
The communication terminal device further includes second communication means for communicating with a device located in the vicinity of the communication terminal device by a short-range wireless communication method, wherein the control means is a short-range wireless communication method with the communication partner. If the direct communication by the short-range wireless communication method is possible, the connection information is transmitted to the communication partner by the short-range wireless communication method, and the short-range wireless communication method is used. When direct communication by a wireless communication method is impossible, control may be performed so that the connection information is transmitted to the communication partner via the communication network.
In the communication terminal device, the control means performs a process of encrypting the connection information with a predetermined key or a process of setting a predetermined password for the connection information, and the connection information after the process is transmitted to the communication partner. You may control to transmit to.
Further, in the communication terminal apparatus, when the control unit needs to establish a communication path for bidirectional communication with the communication partner, prior to establishment of the communication path, the control means You may control so that the connection information containing a port number may be transmitted to the said communicating party.
Further, in the communication terminal apparatus, the control means may perform control so as to execute data synchronization processing with the communication partner in a state where a communication path for bidirectional communication with the communication partner is established. Good.

  According to the present invention, when the IP address is changed, a communication path for bidirectional communication can be established with the communication partner based on the changed IP address, and unintended communication by the communication partner can be prevented. Can do.

The schematic block diagram which shows an example of the communication system which can use the communication terminal device which concerns on one Embodiment of this invention. The block diagram which shows an example of the hardware constitutions of the communication terminal device which concerns on this embodiment. The block diagram which shows an example of the software structure of the communication terminal device which concerns on this embodiment. The block diagram which shows the other example of the software structure of the communication terminal device which concerns on this embodiment. Explanatory drawing which shows an example of the notification process of the connection information (IP address and port number) used for the data synchronization process in the communication terminal device which concerns on this embodiment. (A)-(e) is explanatory drawing which shows an example of the mode of a change of the connection information (IP address and port number) in a communication terminal device when the notification process of the connection information of FIG. 5 is performed. Explanatory drawing which shows the other example of the notification process of the connection information (IP address and port number) used for the data synchronization process in the communication terminal device which concerns on this embodiment. Explanatory drawing which shows the other example of the notification process of the connection information (IP address and port number) used for the data synchronization process in the communication terminal device which concerns on this embodiment. (A)-(e) is explanatory drawing which shows an example of the mode of a change of the connection information (IP address and port number) in a communication terminal device when the notification process of the connection information of FIG. 8 is performed. The sequence diagram which shows an example of the data synchronization process in the some communication terminal device which concerns on this embodiment. The sequence diagram which shows the other example of the data synchronization process in the some communication terminal device which concerns on this embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram illustrating an example of a communication system that can be used by a communication terminal apparatus according to an embodiment of the present invention. In FIG. 1, two communication terminal apparatuses 10 and 15 are illustrated, but three or more communication terminal apparatuses may be provided. In FIG. 1, the communication terminal device of the present embodiment is a portable mobile communication terminal such as a mobile phone or a smartphone that can communicate via a cellular mobile communication network. A communication terminal device other than the mobile communication terminal may be used as long as communication is possible. For example, the communication terminal device according to the present embodiment may be a device having a communication function such as a personal computer device such as a notebook computer, a game machine, a tablet terminal, a digital camera, a printer, or a book browsing terminal. In addition, the communication terminal device according to the present embodiment is a communication device such as a home appliance capable of network cooperation (for example, a TV, a refrigerator, a recording device), a wearable device such as a watch or glasses, a weight scale, a blood pressure monitor, other medical devices, a robot, or the like. It may be a device having a function.

  In the communication system of FIG. 1, each of the communication terminal devices 10 and 15 has a wireless LAN communication function and a mobile communication (cellular communication) function, which will be described later, and between other communication terminal devices at a predetermined synchronization timing. Data synchronization processing can be performed, synchronization data after data synchronization processing can be uploaded to a predetermined backup server at a predetermined backup timing, and synchronization data backed up from the backup server can be downloaded. These data synchronization processing and uploading and downloading of synchronization data may be executed when a user performs a predetermined operation, or may be automatically executed when a predetermined time arrives. Also good.

  In the communication system of the present embodiment, the communication terminal devices 10 and 15 such as the user's mobile phone and smartphone are wireless LAN relay devices (hereinafter referred to as “access points”) provided in a fast food restaurant or a station premises. .) When located in the 20 wireless communicable area 20A, the communication terminal devices 10 and 15 having the wireless LAN communication function can be connected to the communication network via the access point 20. The access point 20 is a wireless LAN relay device such as Wi-Fi (registered trademark) that can wirelessly communicate with the communication terminal devices 10 and 15. The access point 20 is connected to the authentication server 40, via the backbone network 30 and the gateway (GW) 35. It is connected to the backup server 50, the Internet 90, and the like. The authentication server 40 is an authentication processing device that performs authentication processing for subscribers of a wireless LAN service, and the backup server 50 is a backup device that backs up data that is synchronized between communication terminal devices.

  The access point 20 wirelessly communicates with the communication terminal devices 10 and 15 in the wireless communicable area 20A by a wireless LAN wireless communication method such as Wi-Fi conforming to the IEEE 802.11 standard, for example. The communication between 15 and the communication network can be relayed.

  The authentication server 40 is, for example, a RADIUS (Remote Authentication Dial In User Service) server to which a subscriber database (DB) 45 storing various information of subscribers who subscribe to the wireless LAN communication service is connected. The authentication server 40 refers to information stored in the subscriber database 45, and performs WISPr (Wireless Internet Service Provider Roaming) authentication or EAP (Extensible Authentication Protocol) when connecting the communication terminal devices 10 and 15 to the communication network. A server that performs authentication processing such as authentication. The authentication server 40 has a function of communicating with the access point 20 via the backbone network 30 and the gateway (GW) 35 and a function of communicating with the communication terminal devices 10 and 15 via the access point 20. The authentication server 40 may be configured to be communicable with the authentication server 80, and may perform authentication processing in cooperation with or in cooperation with the authentication server 80.

  The information stored in the subscriber database 45 includes, for example, user identification information (user ID) of a wireless LAN communication service, password, subscriber identification information, user information such as name address, and usable services (for example, , Data backup service), information on the communication terminal device being used, and the like.

  In the communication system of the present embodiment, when the communication terminal devices 10 and 15 are located in a cell 60A of mobile communication (hereinafter also referred to as “cellular communication”) such as a macro cell or a small cell, the third generation ( 3G), LTE (Long Term Evolution), LTE-Advanced, 4th generation (4G), 5th generation (5G), and other base stations 60 such as macro cell base stations and small cell base stations for cellular communication The communication terminal devices 10 and 15 having the cellular communication function can be connected to the communication network. The base station 60 is a relay device capable of wireless communication with the communication terminal devices 10 and 15, and is connected to the authentication server 80, the backup server 50, the Internet 90, and the like via the backbone network 70 and the gateway (GW) 75. . The authentication server 80 is an authentication processing device that performs an authentication process on a mobile communication service subscriber.

  The authentication server 80 is, for example, a RADIUS (Remote Authentication Dial In User Service) server to which a subscriber database (DB) 45 storing various information of subscribers who subscribe to the mobile communication service is connected. The authentication server 80 refers to information stored in the subscriber database 85 and is a server that performs authentication processing when connecting from the communication terminal apparatuses 10 and 15 to the mobile communication network. The authentication server 80 has a function of communicating with the communication terminal devices 10 and 15 via the core network 70 and the gateway (GW) 75. The authentication server 80 may be configured to be communicable with the authentication server 40, and may perform authentication processing in cooperation with or in cooperation with the authentication server 40.

  The information stored in the subscriber database 85 includes, for example, user identification information (user ID) of a mobile communication service, password, subscriber identification information, user information such as a name address, and usable services (for example, , Data backup service), information on the communication terminal device being used, and the like.

  The backup server 50 is a server that manages synchronization data that is uploaded at a predetermined timing and is synchronized data that is data after synchronization processing that is synchronized between a plurality of communication terminal devices and is stored in the communication terminal device. It is. The backup server 50 is connected to a backup database (DB) 55 in which synchronization data uploaded from each communication terminal device is stored. The backup server 50 communicates with the communication terminal devices 10 and 15 via the backbone network 30 and the gateway (GW) 35, and communicates with the communication terminal devices 10 and 15 via the core network 70 and the gateway (GW) 75. It has a function.

  The data subject to synchronization processing to be synchronized between the communication terminal devices 10 and 15 is not limited to a specific type of data. For example, mail data and document files that are shared between the communication terminal devices. Image files, video (moving image) files, music files, sound files, installation files of various application programs and programs such as middleware / OS, installation files of various drivers, various setting data, and the like.

Each of the authentication servers 40 and 80, the subscriber databases 45 and 85, the backup server 50, and the backup database 55 can be configured by, for example, a single computer device or a combination of a plurality of computer devices, and are incorporated in advance. Various processes and control can be executed by executing the predetermined program. Further, the authentication server 40 and the subscriber database 45 are constituted by one computer device, the authentication server 80 and the subscriber database 85 are constituted by one computer device, and the backup server 50 and the backup database 55 are constituted by one computer. You may comprise with an apparatus. Further, the authentication servers 40 and 80, the subscriber databases 45 and 85, the backup server 50, and the backup database 55 may be configured by one computer device.

  FIG. 2 is a block diagram illustrating an example of a hardware configuration of the communication terminal device 10 according to an embodiment of the present invention. In FIG. 2, the hardware configuration of the communication terminal device 10 is described, but the other communication terminal devices 15 can be configured in the same manner.

  In FIG. 2, the communication terminal device 10 of this embodiment includes a control unit 110 as a control unit, a network communication unit 111 as a first communication unit, a baseband processing unit 112, a sound input / output unit 113, A display unit 114 and an operation unit 115 as operation means are provided. The communication terminal device 10 is equipped with a USIM 150 as an IC module, which is a subscriber information storage medium that can be attached to and detached from the device body.

  The control unit 110 includes a storage device including an MPU (Micro Processing Unit), a RAM, a ROM, and the like, and controls each unit such as the baseband processing unit 112 by executing a program such as a predetermined basic OS or middleware. Or build a native platform environment or application execution environment on the software configuration.

The control unit 110 also realizes the following functions (1) to (8) in cooperation with the network communication unit 111 and a short-range communication unit 130 described later by executing a predetermined control program. Can do.
(1) Based on a predetermined IP address and port number set for each of the communication terminal device 10 and the communication partner, a communication path for bidirectional communication is established with the communication partner via the communication network.
(2) When the IP address of the communication terminal device 10 is changed, connection information including the changed IP address and the port number of the communication terminal device 10 used for bidirectional communication with the communication partner is used as the communication partner. Send. When the IP address of the communication terminal device 10 is changed, the port number on the communication terminal device 10 side may be changed, and connection information including the changed IP address and port number may be transmitted to the communication partner.
(3) The communication partner's IP address and port number are stored, and when connection information including the communication partner's IP address and port number is received from the communication partner, the communication partner's IP address and port are based on the received connection information. Update the number.
(4) When the communication path of the two-way communication with the communication partner is interrupted, the communication path is attempted to be restored. When the communication path is unsuccessful, the connection information including the communication partner's IP address and port number is transmitted to the communication partner. Request.
(5) It is determined whether or not direct communication is possible with the communication partner using the short-range wireless communication method. If direct communication using the short-range wireless communication method is possible, the connection information is communicated using the short-range wireless communication method. If the direct communication by the short-range wireless communication method is impossible, the connection information is transmitted to the communication partner via the communication network.
(6) A process of encrypting the connection information with a predetermined key or a process of setting a predetermined password for the connection information is performed, and the connection information after the process is transmitted to the communication partner.
(7) When it becomes necessary to establish a communication path for bidirectional communication with a communication partner, connection information including the IP address and port number of the communication terminal device 10 is transmitted to the communication partner prior to the establishment of the communication path. To do.
(8) Data synchronization processing is executed with a communication partner in a state where a communication path for bidirectional communication with the communication partner is established. Note that data transmitted / received to / from a communication partner during data synchronization processing may be encrypted with a predetermined key or a predetermined password may be set.

  The storage device of the control unit 110 includes, for example, at least one of a semiconductor memory, a magnetic disk device, and an optical disk device. The storage device stores a driver program, an operating system program, an application program, data, and the like used for processing in each unit. For example, the storage device includes, as a driver program, a communication driver program that executes a wireless communication method of IEEE802.11 standard and a wireless communication method of mobile communication (cellular communication), an input device driver program that controls the operation unit 115, and a display unit An output device driver program for controlling 114 is stored. In addition, the storage device has, as an operating system program, for example, a basic OS such as Android (registered trademark) OS or iOS (registered trademark), a wireless communication method of IEEE 802.11 standard, or wireless communication of mobile communication (cellular communication). A connection control program for performing authentication and the like in the system is stored. The storage device also stores, as application programs, an authentication program that performs web authentication, a time measurement program that measures time, a web browser program that acquires and displays a web page, an e-mail program that transmits and receives e-mail, and the like. The storage device may store various text data, video data, image data, and the like, or temporarily store temporary data related to a predetermined process. The storage device stores various information for connecting to a wireless LAN access point.

  Further, the storage device of the control unit 110 stores connection information including the communication terminal device 10 used for communication with the communication partner and the IP address and port number of the communication partner. Furthermore, the storage device stores synchronization data that is data subject to data synchronization processing with the communication partner. The storage device stores key information and password information used for encryption when the connection information and synchronization data are encrypted with the communication partner and a password is set.

  The network communication unit 111 communicates via a wireless LAN communication means for communicating via a wireless LAN access point 20 and a base station 60 of a cellular mobile communication network (hereinafter also referred to as “cellular bearer”). It functions as a communication means, and is composed of, for example, a synthesizer, a frequency converter, a high frequency amplifier, an antenna, and the like. The network communication unit 111 executes high-frequency signal processing for wireless communication with the access point 20 using a predetermined communication method such as IEEE 802.11, or performs predetermined communication with the base station 60 such as 3G or LTE. High-frequency signal processing for wireless communication by a communication method is executed.

  The baseband processing unit 112 performs digital processing for performing voice communication and data transmission / reception communication with communication terminal devices such as other mobile phones and various servers. The baseband processing unit 112 and the network communication unit 111 are connected via a D / A converter or an A / D converter.

  The sound input / output unit 113 includes a microphone, a speaker, a sound signal processing unit, and the like. The analog audio signal output from the microphone is converted into a digital signal by the sound signal processing unit and sent to the control unit 110, the baseband processing unit 112, and the like. The speaker receives an analog signal converted from a digital signal by the sound signal processing unit, and outputs a voice during a call, or outputs a ringtone for a mail, a ringing tone for a telephone, music, or the like. The speaker may be configured by separately providing a receiver speaker (receiver) for listening to voice during a call and an external output speaker for outputting ringtones, music, etc. You may comprise with one speaker so that a speaker and an external output speaker may be combined.

  The display unit 114 includes an LCD (liquid crystal display), an organic EL (Electro-Luminescence) display, and the like, and displays various images based on commands from the control unit 110. The operation unit 115 includes a touch panel incorporated in the display unit 114, various operation keys and buttons, a power switch as a power ON / OFF unit, and the like. The operation unit 115 allows the user to turn on / off the main body power of the communication terminal apparatus 10, turn on / off the main body power of the communication terminal apparatus 10, start a call, end a call, select a menu, switch screens, etc. This is used when instructing or inputting information.

  Further, the communication terminal apparatus 10 includes a GPS (Global Positioning System) unit 117 as a position information acquisition unit, a camera unit 118 as an imaging unit, a sensor unit 119, a power supply unit 120 as a power supply unit, and a second communication unit. Short distance communication unit 130, a clock unit (not shown), and the like.

  The GPS unit 117 includes a GPS receiving module, a GPS antenna, and the like, receives radio waves from a plurality of GPS satellites arranged around the earth, and the latitude and longitude at which the communication terminal device 10 is located based on the reception result And altitude data.

  The camera unit 118 includes a lens, an imaging device, and the like, and is used when shooting a person, a landscape, and the like. As the imaging device, a CCD (Charge Coupled Device) camera or a CMOS camera can be used.

  The sensor unit 119 includes an acceleration sensor and / or a geomagnetic sensor. The acceleration sensor may be a uniaxial acceleration sensor or a multi-axis acceleration sensor such as a biaxial or triaxial acceleration sensor. Further, the geomagnetic sensor may be a uniaxial geomagnetic sensor, or may be a multiaxial geomagnetic sensor such as a biaxial or a triaxial. Based on the output of the sensor unit 119, data indicating the position, orientation, posture, and movement of the communication terminal device 10 can be calculated. Further, based on the output of the sensor unit 119, the communication terminal device 10 determines whether or not the communication terminal device 10 is based on history information that is information on temporal changes in acceleration data and geomagnetic data when the user's communication terminal device 10 moves from a reference position at a predetermined altitude. Data indicating the altitude, angle, and the like that are located can be calculated.

  The power supply unit 120 includes a rechargeable battery, a power supply circuit that supplies power of a predetermined voltage from the battery to each unit, a charging circuit that charges the battery, and the like. The clock unit includes a clock circuit and the like, counts accurate date and time, and generates time information for various information update processing and the like.

  The short-range communication unit 130 is for directly communicating with another communication terminal device located near the communication terminal device 10 by a predetermined short-range wireless communication method. NFC (Near Field Communication) peer-to-peer (P2P) communication methods (see ISO14443A, ISO14443B, ISO7816, ISO15693, ISO18092, ISO21481) such as Type A, TypeB, and FeliCa (registered trademark) are examples of short-range wireless communication methods. As the short-range wireless communication method, wireless Ethernet (registered trademark) such as Bluetooth (registered trademark) and Wi-Fi (for example, Wi-Fi Direct, Wi-Fi TDLS (Tunneled Direct Link Setup), etc.), wireless USB, ZigBee Other peer-to-peer communication methods such as a peer-to-peer communication method using radio waves such as IrDA, a communication method using infrared rays such as IrDA, and a communication method using visible light may be used. Here, the “Wi-Fi Direct” and “Wi-Fi TDLS” are communication systems with specifications established by a wireless LAN diffusion promotion organization, Wi-Fi Alliance. When “Wi-Fi Direct” is used, peer-to-peer communication with another communication terminal device may be performed by the network communication unit 111 described above. The “ZigBee” is a communication method in which the electrical specification of the basic part is standardized as IEEE802.15.4, and the specification of the communication protocol between devices above the logical layer is established by the ZigBee Alliance.

  When a plurality of types of short-range wireless communication methods are available, the control unit 110 indicates which short-range wireless communication method is preferentially used for data synchronization processing for the plurality of types of short-range wireless communication methods. A priority (priority) may be set. The priority order (priority) information may be set and changed by the user through an operation or the like.

  The control unit 110 of the communication terminal device 10 according to the present embodiment cooperates with the network communication unit 111, the short-range communication unit 130, and the like by executing a predetermined control program, so that connection information to a communication partner described later ( IP address, port number) notification, communication partner connection information (IP address, port number) confirmation, data synchronization processing with the communication partner, synchronization data upload and download to the backup server, and the like.

Here, the connection information of the communication terminal device 10 and the communication partner establishes a session which is a communication path for bidirectional communication between the communication terminal device 10 and the communication partner when performing data synchronization processing between the communication terminal device 10 and the communication partner. It is information used when For example, the connection information is a socket (network address) that combines an IP address and a port number. The IP address used in the present embodiment is, for example, an IP address of IPv4 (Internet Protocol Version 4) or an IP address of IPv6 (Internet Protocol Version 6). The IP address may be a global IP address or a private IP address. IP address is paid out so as not to overlap each other with respect to the communication terminal device 10 and the communication partner by the DHCP server when e example.

  FIG. 3 is a block diagram illustrating an example of a software configuration of the communication terminal apparatuses 10 and 15 according to the present embodiment. In the example of FIG. 3, the physical layer processing unit 1010 that performs communication with the outside is a short-range communication processing unit such as Bluetooth (registered trademark), wireless USB, ZigBee, NFC, Wi-Fi Direct, Wi-Fi TDLS, or the like. And a network communication processing unit via Ethernet (registered trademark) / Wi-Fi, cellular bearer (including satellite communication), or the like.

  A PAN (Personal Area Network) communication unit 1020 located on the short-range communication processing unit of the physical layer processing unit 1010 is virtually TCP / IP via a communication network between devices at a relatively short distance of about several meters. This is a part that performs processing for performing communication using a protocol, and functions as an interface between the near field communication processing unit and the TCP / IP (HTTP) communication processing unit 1030. With this PAN communication unit 1020, even in P2P communication via the short-range communication processing unit of the physical layer processing unit 1010, an external communication partner can connect with a socket that is a network address combining a global IP address and a port number. TCP / IP communication using the TCP / IP protocol can be performed with a certain other communication terminal device or server.

The network communication processing unit of the physical layer processing unit 1010 can communicate with the TCP / IP (HTTP) communication processing unit 1030 without going through the PAN communication processing unit 1020. Accordingly, in P2P communication via the network communication processing unit of the physical layer processing unit 1010 and a communication network such as the external Internet, an external communication partner is based on a socket that is a network address combining a global IP address and a port number. is with another communication terminal apparatus and a server, it is possible to perform the TCP / IP communication using the TCP / IP protocol is.

A terminal application 1040 positioned above the TCP / IP (HTTP) communication processing unit 1030 performs a data synchronization process with another communication terminal device by performing HTTP communication over TCP / IP communication based on the socket. Can be performed, the synchronization data can be uploaded to the backup server 50, or the synchronization data can be downloaded from the backup server 50. When the terminal application 1040 does not support TCP / IP communication or HTTP communication, the synchronization processing common unit 1041 that is an application (module) that functions as an interface with the TCP / IP (HTTP) communication processing unit 1030 is used. through to perform the a Tsu upload-download processing of data synchronization processing and synchronization data. As a result, regardless of the type of the terminal application 1040, the communication protocol used for the data synchronization processing or the like can be unified with TCP / IP.

As described above, with the software configuration of FIG. 3, the communication protocol (communication logic) is set to TCP / IP in both the P2P communication via the near field communication processing unit and the P2P communication via the communication network such as the external Internet. Can be unified. Therefore, the terminal application that controls the data synchronization processing with the other communication terminal device described above is such that the communication that performs the data synchronization processing is performed via a communication network such as P2P communication via the short-range communication processing unit and the external Internet. there is no need to be aware of the Oh Luke in either the of P2P communication. Therefore, the mounting load and development volume of the terminal application can be reduced. In addition, even if the terminal application does not support TCP / IP communication (HTTP communication), TCP / IP communication (HTTP communication) is possible via the application of the synchronization processing common unit 1041. Mounting load and development volume can be further reduced.
In addition, even if the terminal application does not support TCP / IP communication (HTTP communication), TCP / IP communication (HTTP communication) is possible via the application of the synchronization processing common unit 1041. Mounting load and development volume can be further reduced.
In addition, the application of the synchronization processing common unit 1041 can further reduce the implementation of the end application by mounting a further unique protocol and control logic for performing this as a common module on TCP / IP communication (HTTP communication). It is.

  FIG. 4 is a block diagram showing another example of the software configuration of the communication terminal apparatuses 10 and 15 according to this embodiment. In the example of FIG. 4, the function of the PAN communication processing unit 1020 and the function of the TCP / IP (HTTP) communication processing unit 1030 for the short-range communication processing unit of the physical layer processing unit 1010 of FIG. It is given to the application. According to the example of FIG. 4, even if it is difficult to develop the PAN communication processing unit 1020 of FIG. 3, in any of P2P communication via the short-range communication processing unit and P2P communication via a communication network such as the external Internet In addition, the communication protocol (communication logic) can be unified to TCP / IP.

Next, connection information notification processing and data synchronization processing in the communication terminal device of this embodiment will be described.
Generally, when the communication terminal apparatus 10 is connected to a communication network, it receives an IP address from the DHCP server. The IP address to be paid out may change from time to time. In addition, since the IP address is paid out for each communication path, the IP address to be used is also changed when the communication path is changed. When the IP address is paid out or when it is confirmed that the IP address has been changed from the previous time after the payout, it is necessary to transmit the new IP address to the communication partner. Even when the communication path is changed, it is necessary to transmit connection information including the IP address of the communication path to be used to the communication partner.

Further, when the communication terminal apparatus 10 establishes a session as a communication path for bidirectional communication in order to perform data synchronization processing with a communication partner, the IP address of the network address (socket) used for establishing the session and the port number it is necessary to replace the including connection information.

  Means for notifying (transmitting) or exchanging the connection information include an SMS message destined for terminal identification information (for example, a telephone number) of the communication terminal device 10, an e-mail usable on the Internet, and HTTP communication. Etc. can be used. The SMS message may be an SMS message transmitted / received using WAP (Wireless Application Protocol) Push technology. In addition, when communication terminal devices are close to each other, it is also possible to teach each other's IP address by P2P communication using the above-described short-range wireless communication method. Moreover, like the communication method via a SIP (Session Initiation Protocol) server, the above connection information is uploaded by registering the information connection from the communication terminal device to the server, and inquiring the server each time for communication. Notification (transmission) or exchange may be performed.

  FIG. 5 is an explanatory diagram showing an example of notification processing of connection information (IP address and port number) used for data synchronization processing in the communication terminal device 10 according to the present embodiment. 6A to 6D show an example of a change in connection information (IP address and port number) in the communication terminal apparatuses 10 and 15 when the connection information notification process of FIG. 5 is performed. It is explanatory drawing. The example of FIG. 6 is an example in the case where the communication partner of the communication terminal device 10 is the communication terminal device 15.

  In FIG. 5, each of the communication terminal device 10 and the communication terminal device 15 which is the communication partner thereof is initialized with an IP address derived from a DHCP server or the like and a predetermined port number for bidirectional communication (S101). ). The connection information including the IP addresses and port numbers of the communication terminal devices 10 and 15 set as described above is notified and exchanged between the communication terminal devices by the short-range wireless communication method (S102). For example, before going out, the user holds the communication terminal devices 10 and 15 together and securely goes out after exchanging connection information (IP address, port number). As a result, the communication terminal apparatuses 10 and 15 can grasp each other's connection information (IP address, port number) of the communication partner, establish a session as a communication path with each other based on the connection information, and perform bidirectional communication. This is possible (see FIG. 6A).

  Next, when the network segment to which the communication terminal device 10 is connected changes due to movement of the communication terminal device 10 or the like, a new IP address is issued from the DHCP server of the network segment after the change, and is set in the communication terminal device 10 The IP address to be changed is changed (see FIG. 6B). In the example of FIGS. 5 and 6B, the port number set in the communication terminal device 10 is also changed with the change of the IP address. When the IP address and port number set in the communication terminal device 10 are changed in this way, the session from the communication terminal device 15 that is the communication partner to the communication terminal device 10 is disconnected as shown in FIG. The When the data synchronization process is being executed, the data synchronization process is interrupted.

  Next, when the communication terminal apparatus 10 detects that the IP address set for itself has been changed (Yes in S103), the communication terminal apparatus 10 directly communicates with the communication terminal apparatus 15 that is the communication partner via P2P via short-range wireless communication. It is determined whether or not communication is possible (S104).

  Here, when the short-distance wireless communication with the communication terminal device 15 is possible (Yes in S104), the communication terminal device 10 has changed the communication terminal device 10 after the change set through the short-range wireless communication. The connection information including the IP address and the port number is transmitted to the communication terminal device 15 for notification (S105).

  On the other hand, when short-distance wireless communication with the communication terminal device 15 is impossible (No in S104), the communication terminal device 10 communicates with the communication terminal device via network communication such as a cellular bearer or a wireless LAN (Wi-Fi). The connection information including the changed IP address and port number set in 10 is transmitted to the communication terminal device 15 to be notified (S106).

  For notification of connection information via the network communication, for example, SMS or e-mail can be used. However, notification using a session from the communication terminal device 10 to the communication terminal device 15 as a communication partner is also possible as follows. Is possible. That is, since the communication terminal device 10 whose IP address and port number have been changed knows connection information (IP address and port number) of the communication terminal device 15 of the communication partner, as shown in FIG. A session from the communication terminal device 10 to the communication terminal device 15 can be established. After establishing the session in this way, the communication terminal apparatus 10 can send and notify the communication terminal apparatus 15 of connection information including the changed IP address and port number as shown in FIG. 6 (d). .

  When the IP address assigned to the communication terminal device 15 of the communication partner is a global IP address, the communication terminal device 10 transmits the connection information including the changed IP address and port number to the communication terminal via the Internet. You may transmit to the apparatus 15 and you may notify.

  In addition, when the communication path (session) between the communication terminal device 10 constructed based on the IP address and the communication terminal device 15 of the communication partner is in a disconnected state for some reason, the above SMS or electronic mail is used. In addition to notification, communication via a predetermined server can be used. In this case, a server for managing connection information (IP address, port number) of each communication terminal device is provided. For example, when the IP address of the communication terminal device 10 is changed, the communication terminal device 10 uploads and registers connection information including the changed IP address and port number to the server. Similarly, when the IP address of the communication terminal device 15 of the communication partner is changed, the communication terminal device 15 uploads and registers connection information including the changed IP address and port number to the server. When the communication path (session) between the communication terminal device 10 and the communication partner communication terminal device 15 is disconnected due to some cause, the communication terminal device 10 accesses the server and communicates with the communication partner communication terminal. The connection information after the change of the device 15 can be inquired and acquired. Similarly, the communication terminal device 15 can access the server and inquire and acquire connection information after the change of the communication terminal device 10.

  The communication terminal device 15 that has received the notification of the connection information after the new change, based on the received connection information, the connection information (IP address and port number) of the communication terminal device 10 stored in the communication terminal device 15. ). Furthermore, the communication terminal device 15 returns the session from the communication terminal device 15 to the communication terminal device 10 based on the received connection information, as shown in FIG. Thereby, the communication terminal device 10 and the communication terminal device 15 are in a state in which bidirectional communication is possible. When the data synchronization process is suspended, the data synchronization process can be continued.

  In the example of FIG. 5, it is determined whether or not direct communication with the communication terminal device 15 which is a communication partner via P2P is possible via short-range wireless communication (S104), but this determination may not be performed. . In this case, when there is a change in the IP address, the communication terminal apparatus 10 uses the changed IP address and port number set in the communication terminal apparatus 10 through network communication instead of near field communication. The included connection information is transmitted to the communication terminal device 15 and notified.

  FIG. 7 is an explanatory diagram illustrating another example of the notification process of the connection information (IP address and port number) used for the data synchronization process in the communication terminal device 10 according to the present embodiment. In the example of FIG. 7, the connection information (IP address and port number) is notified to the communication partner not at the timing when the IP address is changed but at the timing when data synchronization processing is required.

  In FIG. 7, when the communication terminal apparatus 10 is operated by the user so as to start the data synchronization process with the communication partner (S201), the communication terminal apparatus 10 has an IP address set to itself. It is confirmed whether or not it has been changed (S202). The subsequent processes in S203 to S206 are the same as the processes in S103 to S106 in FIG.

  In the example of FIG. 7, confirmation of the IP address (S202) and determination of whether or not the IP address has been changed (S203) are performed, but these processes may not be performed. In this case, when the user performs an operation to start data synchronization processing, the communication terminal device 10 determines whether or not direct communication with the communication terminal device 15 that is a communication partner via P2P is possible via short-range wireless communication. (S204).

  In the example of FIG. 7, it is determined whether or not direct communication with the communication terminal device 15 that is a communication partner via P2P is possible via short-range wireless communication (S204), but this determination may not be performed. . In this case, when there is a change in the IP address, the communication terminal apparatus 10 uses the changed IP address and port number set in the communication terminal apparatus 10 through network communication instead of near field communication. The included connection information is transmitted to the communication terminal device 15 and notified.

  FIG. 8 is an explanatory diagram showing still another example of the notification process of the connection information (IP address and port number) used for the data synchronization process in the communication terminal apparatus according to the present embodiment. 9A to 9E illustrate an example of a change in connection information (IP address and port number) in the communication terminal device when the connection information notification process of FIG. 8 is performed. FIG. The example of FIG. 8 is an example in the case where the communication partner of the communication terminal device 10 is the communication terminal device 15.

  In FIG. 8, a data synchronization process is executed in a state in which a session is established between the communication terminal device 10 and the communication terminal device 15 which is a communication partner of the communication terminal device 10 and bidirectional communication is possible (see FIG. 9A). Has been. If the network segment to which the communication terminal device 15 is connected changes due to movement of the communication terminal device 15 of the communication partner during this data synchronization processing, a new IP address is issued from the DHCP server of the network segment after the change. The IP address set in the communication terminal device 15 is changed (see FIG. 9B). In the example of FIGS. 8 and 9B, the port number set in the communication terminal device 15 is also changed with the change of the IP address. When the IP address and port number set in the communication terminal device 15 are changed in this way, the session from the communication terminal device 10 to the communication terminal device 15 is disconnected as shown in FIG. 9C (S301). Data synchronization processing is interrupted.

  Next, the communication terminal device 10 performs processing for returning the disconnected session based on the connection information (IP address and port number) of the communication terminal device 15 of the communication partner known by itself (S302). ). Here, if the session return fails because the connection information (IP address and port number) of the communication terminal device 15 has been changed (Yes in S303), the communication terminal device 15 that is the communication partner via short-range wireless communication. It is determined whether or not direct communication is possible with P2P (S304).

  Here, when the short-distance wireless communication with the communication terminal device 15 is possible (Yes in S104), the communication terminal device 10 has changed the communication terminal device 15 after the change set through the short-range wireless communication. Connection information including an IP address and a port number is requested to the communication terminal device 15 (S305, see FIG. 9D). Then, the communication terminal device 10 receives a response including the changed connection information (IP address and port number) from the communication terminal device 15 via the short-range wireless communication (S306, see FIG. 9D).

On the other hand, when short-range wireless communication with the communication terminal device 15 is impossible (No in S304), the communication terminal device 10 communicates with the communication terminal device via network communication such as a cellular bearer or a wireless LAN (Wi-Fi). the connection information including an IP address and port number of the changed set in 1 5 request to the communication terminal device 15 (S307). Then, the communication terminal apparatus 10 receives a response including the changed connection information (IP address and port number) from the communication terminal apparatus 15 via the network communication (see S308, FIG. 9D).

  The communication terminal device 10 that has received the response including the new changed connection information, based on the received connection information, the connection information (IP address and port number) of the communication terminal device 15 stored in the communication terminal device 10. ) Is updated (S309). Furthermore, the communication terminal device 10 returns the session from the communication terminal device 10 to the communication terminal device 15 as shown in FIG. 9E based on the received connection information. Thereby, the communication terminal device 10 and the communication terminal device 15 are in a state in which bidirectional communication is possible. When the data synchronization process is suspended, the data synchronization process can be continued.

  In the example of FIG. 8, it is determined whether or not direct communication with the communication terminal device 15 that is a communication partner via P2P is possible via short-range wireless communication (S304), but this determination may not be performed. . In this case, when there is a change in the IP address, the communication terminal device 10 uses the changed IP address and port number set in the communication terminal device 15 via network communication instead of near field communication. The connection information that is included is requested and acquired from the communication terminal device 15.

  In the example of FIG. 8, a timeout for a predetermined time may be set when requesting connection information including the changed IP address and port number to the communication terminal device 15. Here, when a timeout elapses without receiving a response from the communication terminal device 15, the communication terminal device 10 transmits, for example, SMS or e-mail for prompting connection information to the communication terminal device 15. The connection information (IP address and port number) on the communication terminal device 10 side may be described in these SMS and e-mail.

  FIG. 10 is a sequence diagram illustrating an example of data synchronization processing in a plurality of communication terminal devices according to the present embodiment. FIG. 10 shows an example of a state in which the communication terminal device 10 and the communication terminal device 15 that is the communication partner of the data synchronization processing target are located at a distance from each other and short-range wireless communication is not possible.

  In the example of FIG. 10, the data synchronization processing is started by a predetermined operation by the user in the communication terminal device 10 as a trigger, but the data synchronization processing is started by the predetermined operation by the user in the communication terminal device 15. You may start. Further, the communication terminal device 10 or the communication terminal device 15 may automatically start the data synchronization process at a predetermined timing set in advance, without being operated by the user.

  In FIG. 10, each of the communication terminal device 10 and the communication terminal device 15 exchanges and stores connection information (IP address and port number) used for data synchronization processing (S401). Further, when the IP address of at least one of the communication terminal device 10 and the communication terminal device 15 is changed due to a change in the network segment or the like, the connection information including the changed IP address is obtained by the notification processing described above. The communication terminal device on the other side is notified (S401). Note that the connection information (IP address and port number) used for the data synchronization processing at the start of the data synchronization processing is not notified when the IP address is changed, but the connection information including the changed IP address is notified. The devices 15 may confirm each other.

  Next, when a predetermined operation for starting data synchronization processing is performed by the user (S402), the communication terminal device 10 approaches the communication terminal device 15 of the communication partner to a position where short-range wireless communication is possible. Is detected (S403). This detection is performed, for example, by searching for and detecting peripheral communication terminal devices for each of the above-described plural types of short-range wireless communication methods that can be used in the communication terminal device 10. Here, as a determination condition for determining whether or not the communication terminal device 15 is approaching, information such as whether or not the electric field strength of the radio wave from the communication terminal device 15 is a certain level or more may be used. . In this example, since the communication terminal device 15 is located at a position away from the communication terminal device 10, the approach of the communication terminal device 15 is not detected by any short-range wireless communication method.

  Next, the communication terminal device 10 communicates with the communication terminal device 15 by network communication via a mobile communication network or the Internet based on the connection information (IP address and port number) of the communication terminal device 15 stored in advance. A session which is a communication path for data synchronization processing is established (S404).

  By establishing the session, a port of a predetermined socket of the communication terminal device 15 is opened, and the communication terminal device 15 itself functions as a server for the communication terminal device 10. Then, the communication terminal device 10 can perform TCP / IP communication by designating the IP address and port number of the communication terminal device 15 by network communication. Further, a port of a predetermined socket of the communication terminal device 10 is opened, and the communication terminal device 10 itself functions as a server for the communication terminal device 15. Then, the communication terminal device 15 can perform TCP / IP communication by designating the IP address and port number of the communication terminal device 10 through network communication.

  After the session is established, the communication terminal apparatus 10 executes data synchronization processing with the communication terminal apparatus 15 through network communication via a mobile communication network or the like (S405). Thereby, the communication terminal device 10 and the communication terminal device 15 can mutually perform a data synchronization process, without going through the server which performs the data synchronization support etc. on a communication network.

  Further, after detecting the predetermined upload timing after the data synchronization process with the communication terminal device 15 (S406), the communication terminal device 10 accesses the backup server 50 and is stored in the communication terminal device 10. The data that has been subjected to data synchronization processing (hereinafter referred to as “synchronous data”) is uploaded to the backup server 50 (S407). Examples of the predetermined timing for uploading the synchronous data include a timing scheduled in advance for uploading the synchronous data, a timing when an operation for starting uploading of the synchronous data is performed by the user, and the like.

  In addition, after uploading the synchronization data to the backup server 50, the communication terminal device 10 detects the predetermined download timing (S408), accesses the backup server 50, and stores the synchronization data stored in the backup server 50. Is downloaded from the backup server 50 and stored in the communication terminal device 10 (S409). Examples of the predetermined timing for downloading the synchronous data include a timing scheduled in advance for downloading the synchronous data, a timing when an operation for starting the download of the synchronous data is performed by the user, and the like.

  When the communication terminal devices 10 and 15 are all reset to the initial state by backup (upload and download) of the synchronization data to the backup server 50, or when the communication terminal devices 10 and 15 break down, the synchronization data roll Back is possible.

  In order to reduce the load on the backup server 50 and the load on the communication path with the backup server 50, the frequency of the predetermined timing for uploading and downloading the synchronization data is the frequency of data synchronization processing between the communication terminal devices. May be less.

  FIG. 11 is a sequence diagram illustrating another example of the data synchronization processing in the communication terminal device 10 according to the present embodiment. FIG. 11 shows an example of a state in which the communication terminal device 10 and the communication terminal device 15 that is the communication partner of the data synchronization processing target are close to each other and can perform short-distance wireless communication with each other.

  In the example of FIG. 11, the data synchronization processing is started with a predetermined operation by the user in the communication terminal device 10 as a trigger. However, the data synchronization processing is started with the predetermined operation by the user in the communication terminal device 15 as a trigger. You may start. Further, the communication terminal device 10 or the communication terminal device 15 may automatically start the data synchronization process at a predetermined timing set in advance, without being operated by the user.

  Further, the connection information exchange and change notification (S501), synchronization data upload (S507, S508), and synchronization data download (S509, S510) in FIG. 11 are the same as S401 and S406 to S409 in FIG. Therefore, explanation is omitted.

  In FIG. 11, when a predetermined operation for starting data synchronization processing by the user is performed, the communication terminal device 10 approaches the communication partner communication terminal device 15 to a position where short-range wireless communication is possible. Is detected (S503). This detection is performed, for example, by searching for and detecting peripheral communication terminal devices for each of the above-described plural types of short-range wireless communication methods that can be used in the communication terminal device 10. Here, as a determination condition for determining whether or not the communication terminal device 15 is approaching, information such as whether or not the electric field strength of the radio wave from the communication terminal device 15 is a certain level or more may be used. . In this example, since the communication terminal device 15 is located at a position close to the communication terminal device 10, the approach of the communication terminal device 15 is detected.

  Next, when the approach of the communication terminal device 15 is detected by a plurality of types of short-range wireless communication schemes, based on information on priorities (priorities) preset for the plurality of types of short-range wireless communication schemes. The short-range wireless communication method used for the data synchronization process is determined (S504). In addition, when the approach of the communication terminal device 15 is detected only by a single short-range wireless communication method, the process of determining the short-range wireless communication method (S504) may be omitted.

  Next, the communication terminal device 10 uses the predetermined short-range wireless communication method in which the approach of the communication terminal device 15 is detected based on the connection information (IP address and port number) of the communication terminal device 15 stored in advance. A session which is a communication path for data synchronization processing is established with the communication terminal device 15 by distance wireless communication (S505).

  By establishing the session, a port of a predetermined socket of the communication terminal device 15 is opened, and the communication terminal device 15 itself functions as a server for the communication terminal device 10. Then, the communication terminal device 10 can perform TCP / IP communication by specifying the IP address and port number of the communication terminal device 15 by short-range wireless communication. Further, a port of a predetermined socket of the communication terminal device 10 is opened, and the communication terminal device 10 itself functions as a server for the communication terminal device 15. Then, the communication terminal device 15 can perform TCP / IP communication by specifying the IP address and port number of the communication terminal device 10 by short-range wireless communication.

  After the session is established, the communication terminal device 10 executes data synchronization processing with the communication terminal device 15 by short-range wireless communication using the predetermined short-range wireless communication method (S506). Thereby, the communication terminal device 10 and the communication terminal device 15 can mutually perform a data synchronization process, without going through the server which performs the data synchronization support etc. on a communication network.

As described above, according to the present embodiment, when the IP address set in the communication terminal device is changed, the connection information including the changed IP address is transmitted and notified to the communication partner. A communication path for bidirectional communication can be established with the communication terminal apparatus based on the notified changed IP address. Further, since the connection information notified to the communication partner includes the port number set in the communication terminal device, the communication partner communicates with the communication terminal device based on the notified port number. A route can be established.
Moreover, the port number included in the connection information notified from the communication terminal device to the communication partner is a predetermined port number set in the communication terminal device for bidirectional communication with the communication partner. Therefore, even when the connection information transmitted from the communication terminal device is delayed in reaching the communication partner and the changed IP address once set in the communication terminal device is assigned to another communication terminal device, A communication path for bidirectional communication based on the predetermined port number cannot be established between the communication terminal device and the communication partner. Therefore, the communication partner that received the connection information with a delay cannot start two-way communication with another unintended communication terminal.
Therefore, when the IP address set in the communication terminal device is changed, a communication path for bidirectional communication can be established with the communication partner based on the changed IP address, and unintended communication by the communication partner can be performed. Can be prevented.

  In order to prevent unintended communication on the side of the communication terminal device that has received the notification of the connection information when notification of the connection information for the data synchronization processing is performed, the following (1) to (3) The following measures may be taken.

(1) When a new IP address is issued to the communication terminal devices 10 and 15, the port number for opening a socket for bidirectional communication is changed each time.

(2) Data of connection information (IP address and port number) transmitted / received by the communication terminal devices 10 and 15 is encrypted by a common key or public key encryption method. If the decryption of the encrypted data fails or the hash values do not match, it is regarded as an unauthorized communication partner and the processing is not continued. An error response is returned to the communication partner.
Here, the common key or the public key uses short-range wireless communication when the communication terminal devices 10 and 15 that perform communication are close to each other, and the network when the communication terminal devices 10 and 15 are separated from each other. The setting information such as using SMS or the like using may be exchanged between the communication terminal devices 10 and 15 in advance or preset in the communication terminal devices 10 and 15.
Also, the encryption key (common key and public key) may be unified for all of the plurality of communication terminal devices that perform data synchronization processing, or different keys may be set for each of the plurality of communication terminal devices. May be. In either case, data of connection information (IP address and port number) is encrypted using an encryption key decided in advance between the communication terminal devices.

(3) Data of connection information (IP address and port number) is transmitted by using or using authentication using ID and password. For the ID and password, information in the USIM 150 attached to the communication terminal device, telephone number, MAC address, IC card (NFC) unique identification information (ID), e-mail address, etc. may be used. These IDs and passwords may be encrypted.

Further, according to the present embodiment, the first communication path via the communication network or the second communication path by the short-range wireless communication method is established between the communication partner and the communication partner via the server on the communication network. The data synchronization process can be performed with the communication partner.
In addition, the communication path used for the data synchronization process with the communication partner is established by giving priority to establishing the second communication path by the short-range wireless communication method over the first communication path via the communication network. Data synchronization processing can be performed with a communication partner without increasing the communication load on the network.
Therefore, data synchronization processing can be performed with a communication partner without going through a server on the communication network and without increasing the communication load on the communication network.

  In the above embodiment, the data itself transmitted and received in the data synchronization process between the communication terminal device 10 and the communication terminal device 15 of the communication partner may be encrypted. In this case, the receiving communication terminal device that has received the encrypted data transmits the encrypted data based on whether or not it can be decrypted into an expected predetermined format (for example, a message format). It is possible to determine whether the communication terminal device (or the user) on the side is a valid communication terminal device (or a valid user). For example, in the data synchronization process, if the received communication terminal apparatus can decrypt the received encrypted data into an expected predetermined format (for example, a message format), the transmitting communication terminal apparatus (or It can be determined that the user) is a valid communication terminal device (or a valid user).

DESCRIPTION OF SYMBOLS 10,15 Communication terminal device 20 Access point 20A Wireless communication area 30 Backbone network 40 Authentication server 50 Backup server 55 Backup database 60 Base station 60A Cell 70 Backbone network 80 Authentication server 90 Internet

JP 2006-319453 A

Claims (4)

First communication means for communicating via a communication network;
A communication terminal device comprising: a control means for controlling the first communication means,
Storage means for storing an IP address and a port number for designating the sockets of the communication terminal device and the communication counterpart used for data synchronization processing by bidirectional communication via the first communication means;
TCP / IP protocol via the first communication means with the communication partner based on the socket specified by the IP address and port number of the communication terminal device and the communication partner stored in the storage means Means for performing data synchronization processing by two-way communication,
The control means includes
When the IP address of the communication terminal device is changed during data synchronization processing by bidirectional communication with the communication partner, the data synchronization processing by bidirectional communication is interrupted and combined with the changed IP address. Changing the port number used for the data synchronization processing, updating the IP address and port number of the communication terminal device stored in the storage means with the changed IP address and the changed port number, the IP address and port number of the changed after the change is notified to the communication partner, and continue the data synchronization process by the bidirectional communication based on the IP address and port number of the changed after change,
When the IP address of the communication partner is changed during the data synchronization processing by the bidirectional communication with the communication partner, the data synchronization processing by the bidirectional communication is interrupted, and the IP after the change of the communication partner is changed. receives the address and port number of the changed from the communication party, IP address, and port number after change after change the IP address and port number of the communication partner stored in the storage means is received from the communication partner The communication terminal device is controlled so as to continue the data synchronization processing by the bidirectional communication based on the changed IP address and the changed port number received from the communication partner. . The communication terminal device according to claim 1,
A second communication means for communicating with a device located in the vicinity of the communication terminal device by a short-range wireless communication method;
The control means includes
Determining whether or not direct communication by the near field communication method with the communication partner is possible,
If direct communication by the short-range wireless communication method is possible, send the changed IP address and the changed port number to the communication partner in the short-range wireless communication method,
When direct communication by the short-range wireless communication method is impossible, control is performed so that the changed IP address and the changed port number are transmitted to the communication partner via the communication network. A communication terminal device. In the communication terminal device according to claim 1 or 2,
The control means includes
Performing a process of encrypting the changed IP address and port number with a predetermined key or a process of setting a predetermined password for the changed IP address and the changed port number;
A communication terminal apparatus that controls to transmit the processed IP address and port number to the communication partner. In the communication terminal device according to any one of claims 1 to 3,
The control means performs control so as to transmit the IP address and port number of the communication terminal device to the communication partner prior to data synchronization processing by bidirectional communication with the communication partner. Communication terminal device.

Images