JP2007104163A - Communication terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication terminal in which service mobility is achieved by switching a service reception terminal from a mobile terminal to a plurality of communication terminals specified. <P>SOLUTION: A mobile terminal 101 comprises a capability information transmitting/receiving section 204 for inquiring the capability of other communication terminals 102 and 103 constituting a PAN 105, when communication of session consisting of a plurality of media is performed with a communication terminal 104; a section 208 selecting a communication terminal that is most suitable for performing media communication based on the terminal capability of other communication terminals 102, 103 obtained at the capability information transmitting/receiving section 204 and the terminal capability of own terminal 101; and a session control section 207 transmitting a message of session connection for communicating a medium corresponding to a selected communication terminal 102, 103 between the selected communication terminal 102, 103 and a partner communication terminal 104 to the selected communication terminal 103. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a communication technology in an IP network, and more specifically to a communication terminal that realizes switching to an optimal communication terminal and service mobility.

  In recent years, with the widespread use of mobile terminals such as mobile phones and PDAs, it has become common for users to perform communications such as calls and videophones while moving. However, mobile terminals have physical restrictions such as small size, light weight, and battery driving because priority is given to carrying and wearing. Therefore, it has been difficult to mount a large screen, surround speakers, a high-speed CPU, a large-capacity memory, a keyboard, etc. on a mobile terminal. For this reason, mobile terminals, for example, have to watch videos on a small screen, and tend to lack convenience for users to enjoy services.

  In recent years, the number of communication terminals that can be connected to the network has been increasing, so use mobile terminals while moving, and use other communication terminals that exist in the vicinity when not moving. It is becoming possible to enjoy advanced services that meet these requirements. This is expected to improve user convenience.

  In addition, when the mobile terminal starts moving, it is fast enough not to feel the interruption of the service received by the peripheral communication terminal, that is, for the user, the service is continued while the service is apparently continued. It is expected that service mobility is improved and user convenience is further improved by switching the service receiving terminal from the communication terminal to the mobile terminal.

  When such service mobility is regarded only as switching of a data receiving terminal, an IP telephone transfer service realized by SIP (Session Initiation Protocol: IETF RFC3261) is famous as a conventional technique.

  Further, Non-Patent Document 1 discloses a technique for realizing service mobility by using SIP. In Non-Patent Document 1, when a mobile terminal is moving during a communication service, a search is made for communication terminals existing in the vicinity thereof. When a communication terminal suitable for receiving a service in communication from a mobile terminal and holding a session control means is found, the service reception terminal is switched from the mobile terminal to the discovered communication terminal. The user can be provided with a more advanced service. In addition, when a user receiving a service moves using a stationary communication terminal, continuous service reception during movement is possible by switching the service receiving terminal from the communication terminal to the mobile terminal. I have to.

“Proposal of Service Mobility Technology in Ubiquitous Network” (NTTR & D Vol.52No.3), Takao Nakanishi et al.

  With these technologies, a mobile terminal is used while moving, and when it does not move, for example, when it is in a house or office, a user terminal can be requested by using a communication terminal with excellent functionality and operability. It enables advanced service reception that meets the requirements.

  However, in the prior art, the purpose is to transfer an IP phone, and the transfer destination and the transfer source are one-to-one. As long as the transfer source specifies only the transfer destination communication terminal, even if the terminal capability after transfer is determined based on the transfer destination's own terminal capability, transfer of the IP phone is possible, so the user's convenience is lost. There wasn't. In Non-Patent Document 1, since the conventional technology is used, the mobile terminal selects the switching destination communication terminal and issues a switching instruction. Thereafter, the switching destination communication terminal itself switches to the switching destination communication terminal itself. The terminal capability after switching is determined based on the terminal capability.

  As a result, the user using the mobile terminal cannot explicitly specify the terminal capability after switching to the switching destination communication terminal or specify a plurality of switching destination communication terminals. That is, a mobile terminal that is receiving a service composed of a plurality of media cannot switch a service receiving terminal by designating a plurality of switching destination communication terminals based on the media data type.

  In view of the above background, an object of the present invention is to provide a communication terminal that designates and switches a service receiving terminal to a plurality of communication terminals based on a media data type. In addition, service mobility that improves user convenience by flexibly copying and moving a part of media data received at a certain communication terminal to other communication terminals. It aims at providing the communication terminal which carries.

  The communication terminal of the present invention inquires about the terminal capabilities of other communication terminals constituting a personal area network (PAN) during session connection of a service including a plurality of media data with a communication partner terminal which is a communication partner. A service receiving terminal that is a communication terminal that transmits and receives the media data, based on the terminal capability of the other communication terminal and the terminal capability of the own terminal obtained by the capability inquiry means and the terminal capability inquiry means; Communication terminal selection means for selecting each media data, and session connection for communication between at least one service receiving terminal selected by the service receiving terminal selected by the communication terminal selecting means and the communication partner terminal Session control means for transmitting a transition message for transitioning to the selected service receiving terminal; Provided.

  With this configuration, by selecting a communication terminal according to the terminal capability, it is possible to determine an optimum terminal for receiving media data from among the communication terminals constituting the PAN, and to transfer the session connection to the determined terminal. .

  In the communication terminal, the migration message may include the selected service receiving terminal as receiving destination information for each media data.

  As a result, the communication terminal can cause at least one of the media data connected in the session to be communicated to the service receiving terminal, which is another communication terminal suitable for the media data, thereby improving the convenience for the user to enjoy the service. It becomes possible to make it.

  In response to the transition message by the session control means, the communication terminal sends a message for disconnecting the session with the communication partner terminal after the session between the service receiving terminal and the communication partner terminal is connected. You may provide the transmission means to transmit to a communicating party terminal.

  In this way, after a session is connected between a service receiving terminal that is another communication terminal and a communication partner terminal, the transmission of the media data communicated in the session to the own terminal is stopped, so that the media data Can be completely switched. Thereby, it is possible to prevent the inconvenience of communicating the same media redundantly for a user who enjoys the service.

  A communication terminal according to another aspect of the present invention constitutes a personal area network (PAN) from another communication terminal that is connected to a communication session with a communication partner terminal that is a communication partner and is composed of a plurality of media data. A session connection, a receiving means for receiving a migration message describing a request to migrate the destination of the media data, and the media data designated in the migration message, and the communication partner terminal And a session control means for transmitting a message for connecting the session.

  With this configuration, it is possible to take over a session that has been performed by another communication terminal that configures the PAN.

  The communication terminal transmits the session connection request transmission / reception unit when the communication terminal selection unit selects a service reception terminal for every media data type communicated with the communication partner terminal. The session between the own terminal and the communication partner terminal is disconnected after the session is connected between the service receiving terminal having the selected terminal capability and the communication partner terminal by a message for switching the connection of the selected session. A disconnect message transmission means for transmitting a message to the communication partner terminal may be provided.

  In this way, when all media data is communicated between the service receiving terminal and the communication partner terminal in a session, by disconnecting the session between the own terminal and the communication partner terminal, the media communication terminal is Can be switched. Thereby, it is possible to prevent the inconvenience of communicating the same media redundantly for a user who enjoys the service.

  In a communication terminal according to another aspect of the present invention, a service receiving terminal that forms a personal area network together with its own terminal is connected to a communication partner terminal during a session consisting of a plurality of media data. There is media data inquiry means for inquiring information to the service receiving terminal, media data that can be communicated by the own terminal based on the media data being communicated obtained by the media data inquiry means and the terminal capability of the own terminal A communicable media judging means for judging whether or not there is a communicable medium by the communicable media judging means, and a session between the service receiving terminal and the communication partner terminal when the media data is judged A message for instructing output switching from the connection to the own terminal is transmitted to the service receiving terminal. , To the communication partner terminal from the service receiving terminal, according to terminal capability which the service receiving terminal has been instructed, and a session switching request reception means for sending a message redirection of the media data.

  By providing such session connection request transmission / reception means, the transmission / reception destination of the media data being communicated at the service receiving terminal can be changed to the own terminal. When the own terminal is a mobile terminal, it is possible to carry at least one of the media data, and it is possible to improve the convenience for the user to enjoy the service.

  In a communication terminal according to another aspect of the present invention, a service receiving terminal that forms a personal area network together with its own terminal is connected to a communication partner terminal during a session consisting of a plurality of media data. There is media data inquiry means for inquiring information to the service receiving terminal, media data that can be communicated by the own terminal based on the media data being communicated obtained by the media data inquiry means and the terminal capability of the own terminal If it is determined that there is media data that can be communicated by the communicable media determination unit, the media data is transmitted between the service receiving terminal and the communication partner terminal. A message for instructing transmission of a copy of media data designating session connection to the terminal. Session copy request transmission / reception means for transmitting to a service receiving terminal, and transmitting a message of output destination copy of media data from the service receiving terminal to the communication partner terminal according to the terminal capability instructed by the service receiving terminal. .

  By providing the session switching request transmission / reception means in this way, the transmission / reception destination of the media data being communicated at the service receiving terminal can be copied to the own terminal. When the own terminal is a mobile terminal, the mobile terminal can carry part of the media data while receiving the media data at the service receiving terminal, and the convenience for the user to enjoy the service can be improved.

  According to the present invention, a message to be transmitted to another communication terminal includes a plurality of pieces of media data output destination information, so that a part of the media data communicated in the session can be received by the other communication terminal suitable for it. The terminal can be changed and added to the terminal. In addition, it is possible to improve convenience for the user to enjoy the service by specifying the terminal capability at the time of switching the service receiving terminal and switching at least one other communication terminal as the service receiving terminal.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a diagram showing a configuration of a mobile terminal 101 according to the embodiment of this invention. Before describing the mobile terminal 101 of the present embodiment with reference to FIG. 1, a network configuration to which the mobile terminal 101 is applied will be described with reference to FIG. In the present embodiment, the own terminal will be described as the mobile terminal 101, but the own terminal is not necessarily a portable communication terminal.

  FIG. 2 is a diagram illustrating a network configuration to which the mobile terminal 101 according to the present embodiment is applied. As shown in FIG. 2, a mobile terminal 101, a communication terminal 102, a communication terminal 103, and a communication terminal 104 are connected via an IP network 100. The IP network 100 is, for example, a telephone network, cellular, wireless LAN, or the Internet.

  The mobile terminal 101 is a portable communication terminal such as a PDA, a mobile phone, and other mobile devices. The communication terminals 102 to 104 are stationary communication terminals that can be connected to a network, such as OA devices such as PCs and printers, and AV devices such as TVs, DVDs, and speakers. In addition, the communication terminals 102 and 103 and the mobile terminal 101 have a PAN (Personal Area Network) 105 in proximity wireless, for example, Bluetooth (registered trademark), IrDA (Infrared Data Association), UWB (Ultra Wide Band), RFID, or the like. It is composed. The mobile terminal 101 and the communication terminals 102 and 103 in the PAN 105 can communicate with each other without passing through the IP network 100.

  Next, the mobile terminal 101 of the present embodiment will be described with reference to FIG. Note that the communication terminals 102 to 104 have the same configuration as that of the mobile terminal 101 with regard to the configuration for performing service switching control. Note that “switching” in the present embodiment refers to shifting the service used by the mobile terminal 101 to another communication terminal for each media data. Thereby, after switching, the mobile terminal 101 is not in a state of using the service.

  The mobile terminal 101 includes a network transmission / reception unit 200 and a proximity wireless transmission / reception unit 205 as an interface for data transmission / reception. The network transmission / reception unit 200 transmits / receives multimedia data such as text data, audio data, and video data via the IP network 100, for example. The network transmission / reception unit 200 is connected to the data transmission / reception unit 201. The data transmission / reception unit 201 has a function of decoding data received from the network transmission / reception unit 200 and encoding data to be transmitted. The near field radio transmission / reception unit 205 transmits / receives data to / from a communication terminal in the PAN 105.

  The mobile terminal 101 includes an input / output unit 202 as a user input / output interface, for example. The input / output unit 202 receives input from a user using a numeric keypad, pen, button, and the like, and outputs a processing result or the like to a display, a speaker, or the like.

  In addition, the mobile terminal 101 includes a capability information transmission / reception unit 204, a service terminal determination unit 206, a session control unit 207, and a session database (hereinafter referred to as a session DB) 209 in order to switch service reception terminals. The capability information transmission / reception unit 204 has a function of transmitting / receiving capability information of communication terminals constituting the PAN 105. For example, the capability information transmission / reception unit 204 has functions such as UPnP (Universal Plug and Play) and SLP (Service Location Protocol). The service terminal determination unit 206 has a function of selecting a communication terminal capable of receiving a service based on terminal capability information received by the capability information transmission / reception unit 204, for example, a codec type, a screen size, and the like.

  In addition, the service terminal determination unit 206 requests the input / output unit 202 to display the result via the overall control unit 203 in order to cause the user to select a switching destination terminal, and the selection result from the user is A function of receiving via the overall control unit 203 may be provided.

  The session control unit 207 has a terminal switching unit 208 that switches a service receiving terminal requested by the service terminal determination unit 206, and a function that opens / disconnects a multimedia data communication session. When the terminal switching unit 208 receives a request for switching the service receiving terminal to which the selection result is added, the terminal switching unit 208 creates a terminal switching message based on the request and requests the network transmitting / receiving unit 200 to transmit the message. Further, the terminal switching unit 208 receives a response to the terminal switching message via the network transmission / reception unit 200. The terminal switching message will be described.

  FIG. 3A is a configuration example of a message created by the terminal switching unit 208. Following the terminal switching instruction 300, the terminal switching message includes a switching destination address 301 indicating a switching destination communication terminal as a terminal for exchanging control signals, a switching source address 302 indicating a switching source, and at least one or more data after terminal switching Data transmission destination address information 303 for determining an output destination is included. The data transmission destination address information 303 includes a data transmission destination address and data type of media data. There are as many data transmission destination addresses as there are transmission destinations.

  As shown in FIG. 1, a session database (hereinafter referred to as a session DB) 209 is connected to the session control unit 207. The session DB 209 manages the session state that changes due to the switching of the service receiving terminal by the terminal switching unit 208 and the session state that accompanies session opening / disconnection. Here, an example of data managed in the session DB 209 is shown.

  FIG. 4A is a diagram illustrating a configuration example of data stored in the session DB 209. The session DB 209 includes a transmission destination address 400 serving as a destination address of the session, a data type 401 indicating the type of media data transmitted / received in the session, a data transmission destination address 402 serving as a transmission destination of media data, and a reception destination of media data. Among the media data processing functions possessed by the destination communication terminal indicated by the data receiving destination address 403 and the sending destination address 400, the data type 404 other than the data type 401 is configured. That is, the function of the communication terminal having the transmission destination address 400 is a combination of the data type 401 and the transmission destination data type 404.

  Next, the operation of switching service receiving terminals in the present embodiment will be described. Here, an example of a sequence that enables switching from one mobile terminal to a plurality of communication terminals will be described. In the following description, SIP (Session Initiation Protocol: IETF RFC3543) is used as a session control protocol, and RTP (Real-time Transport Protocol: IETF RFC1890) is used as a media data transmission / reception protocol such as audio and video.

  The terminal capability of the mobile terminal 101 is a small display screen such as 2.2 inches, and the audio codec / encoding is AMR, G. 711, video codec encoding is MPEG4. The communication terminal 102 is a TV phone device having a small screen equivalent to the mobile terminal 101 and having a high-quality speaker with a microphone. 711, video codec encoding is MPEG4. The communication terminal 103 is a projector with a camera capable of displaying on a large screen. 711, video codec encoding is MPEG4. Further, the communication terminal 104 is a PC, and its terminal capability is that the voice codec / encoding is AMR / G. 711, video codec encoding is MPEG4. In the mobile terminal 101 or the communication terminals 102 to 104, terminal capabilities such as audio codec / encoding and video codec / encoding are stored in each overall control unit 203.

  FIG. 5 is an example of a service switching sequence from the mobile terminal 101 to the communication terminals 102 and 103. In the state before switching, the mobile terminal 101 performs multimedia data communication with the communication terminal 104 (S500). As multimedia data communication, for example, a case where a videophone is being used with MPEG4 and AMR codec encoding is assumed. The session state stored in the session DB 209 of the mobile terminal 101 at this time is shown in FIG. 4B, and the session state stored in the session DB 209 of the communication terminal 104 is shown in FIG.

  At this time, if the mobile terminal 101 detects that the other communication terminals 102 and 103 exist around the mobile terminal 101 by the proximity wireless transmission / reception unit 205, the capability information transmission / reception unit 204 passes through the proximity wireless transmission / reception unit 205. Carry out a service search request. Upon receiving the service search request, the communication terminals 102 and 103 notify the capability information transmission / reception unit 204 of the own terminal capability from the overall control unit 203, and the capability information transmission / reception unit 204 uses the near field radio transmission / reception unit 205 to the mobile terminal 101. Send terminal capabilities as a response.

  Next, the mobile terminal 101 that has received the response to the service search request from the capability information transmission / reception unit 204 holds the transmission destination data type 404 and the data type 402 in FIG. The service receiving terminal is selected from the own terminal capability and the received response. For example, the selection method may be automatically selected according to the condition that the terminal capability is superior to the terminal capability that is communicating with the service determination unit 206, or the profile information set in advance by the user. Further, the selection result may be displayed on a display via the input / output unit 202 and the user may be requested to make a final decision.

  In the present embodiment, the service terminal determination unit 206 automatically serves as an audio data input / output device that is superior to the terminal capability of the mobile terminal 101, as a communication terminal 102 that holds a high-quality speaker, and as a video data input / output device. It is assumed that the communication terminal 103 having a large screen is selected. Then, the service terminal determination unit 206 notifies the detected result to the overall control unit 203 (S501).

  The overall control unit 203 of the mobile terminal 101 receives the result and requests the terminal switching unit 208 to switch the service receiving terminal by session control. As shown in FIG. 3B, the terminal switching unit 208 switches the two communication terminals 102 and 103, and the switching destination address 301 is an address of the communication terminal 103 and the switching source address 302 is a terminal that exchanges control signals. Mobile terminal 101 address, data transmission destination address information 303-1 is the address of communication terminal 103, MPEG4, data transmission destination address information 303-2 is the address of communication terminal 102, G. Set to 711 to create a terminal switching message.

  Since the session control protocol is SIP, the REFER method (IETF RFC3515) for session transfer is used, the terminal switching instruction 300, the switching destination address 301, and the switching source address 302 are used as headers in the REFER method, and data transmission destination address information 303 is used. Is the body of the REFER method, that is, the extension. Note that a session description protocol such as SDP (Session Description Protocol: IETF RFC2327) may be used for the extension unit.

  The mobile terminal 101 transmits the created terminal switching message (REFER method) from the network transmitting / receiving unit 200 to the communication terminal 103 (S502). Upon receiving the terminal switching message transmitted from the mobile terminal 101, the terminal switching unit 208 of the communication terminal 103 transmits an INVITE method to the communication terminal 104 that is the switching destination address (S503). The contents set in the data transmission destination address information 303 of the REFER method are set in the INVITE method transmitted here. At this time, even if the terminal capability stored in the overall control unit 203 of the communication terminal 103 is greater than or equal to the type set in the received data transmission destination address information 303, the terminal switching unit 208 uses the normal INVITE method. Must not be set.

  That is, in the case of the present embodiment, the G.C. 711 is data that can be processed by the communication terminal 103, but cannot be set because it is not the terminal capability designated by the mobile terminal 101. Thereby, the transmission source mobile terminal 101 can designate a communication terminal in charge of each media data.

  Upon receiving the INVITE method, the communication terminal 104 creates an INVITE method response by the terminal switching unit 208, transmits it to the communication terminal 103 (S503), sends video data to the communication terminal 103, and audio data to the communication terminal 102. The data transmission / reception unit 201 is set so as to transmit / receive data (S504, S505). Next, when the communication terminal 103 receives the INVITE method response, the terminal switching unit 208 creates a NOTIFY method as a response to the REFER method (S502), and instructs the network transmission / reception unit 200 to send a transmission request to the mobile terminal 101. (S506). The session DB 209 of the communication terminals 103 and 104 is updated to the state shown in FIGS. 4C and 4E by the terminal switching unit 208.

  When the mobile terminal 101 detects reception of the NOTIFY method, the mobile terminal 101 creates a BYE method for session disconnection by the session control unit 207 and transmits it to the communication terminal 104 (S507). Thereafter, the mobile terminal 101 clears the session DB 209 and updates it to the state shown in FIG.

  Through the above processing, the videophone session established between the mobile terminal 101 and the communication destination terminal 104 can be switched from the mobile terminal 101 to the two communication terminals of the communication terminal 102 and the communication terminal 103. Become.

  In the first embodiment, a service terminal determination unit 206 and a terminal switching unit 208 are provided in the conventional mobile terminal 101, and a communication terminal in charge for each media data is described in a message transmitted to each communication terminal. I can do it now. As a result, the user designates the terminal capability to be used after switching the service receiving terminal for at least one communication terminal having a plurality of terminal capabilities via the mobile terminal 101 for each media data, and receives the mobile terminal 101. It is possible to reproduce the service that has been performed, and it is possible to improve the convenience for the user to enjoy the service.

(Second Embodiment)
FIG. 6 is a configuration diagram of the mobile terminal 101 according to the second embodiment of the present invention. Note that the communication terminals 102 to 104 have the same configuration as the mobile terminal 101.

  The configuration of the mobile terminal 101 according to the second embodiment is basically the same as that of the mobile terminal 101 according to the first embodiment, except that a terminal change transmission / reception unit 600 is further provided. .

  The terminal change transmission / reception unit 600 is provided between the proximity wireless transmission / reception unit 205 and the overall control unit 203. Upon receiving a change request for a communication terminal serving as a media data output destination from the communication terminals constituting the PAN 105, the terminal change transmission / reception unit 600 issues an instruction to the overall control unit 203. In addition, the terminal change transmission / reception unit 600 transmits a terminal change request from the overall control unit 203 to the communication terminals constituting the PAN 105. Here, the media data output destination change message transmitted / received by the terminal transmitting / receiving unit 600 will be described. Note that “change” in the present embodiment is to transfer arbitrary media data among the services used by other communication terminals to the mobile terminal 101 which is the own terminal. For this reason, other communication terminals that have used the changed media data do not use the media data after the change.

  FIG. 7A is a diagram illustrating a data configuration example of a media data output destination change message transmitted / received by the terminal change transmission / reception unit 600 via the proximity wireless transmission / reception unit 205. As shown in FIG. 7A, the media data output destination change message includes Exchange 700 indicating the change request and media data output destination information 701 indicating the output destination of the media data. The media data output destination information 701 includes an operation source address that is an output source address of media data, an operation destination address that is an output destination address of media data, and a data type of the media data of the output destination. There are as many pieces of media data output destination information 701 as the number of output destinations to be changed.

  FIG. 8 is a diagram illustrating the operation of changing the media data output destination in the second embodiment. The state before the change is a state during a videophone call, and MPEG4 video data is transmitted and received between the communication terminal 103 and the communication terminal 104 (S900). 711 audio data is transmitted / received (S901). In the second embodiment, an example of changing the media data output destination will be described from this state.

  In the following description, as in the first embodiment, SIP is used as a session control protocol, and RTP is used as a media data transmission / reception protocol such as voice and video. The terminal capabilities possessed by the mobile terminal 101 and the communication terminals 102 to 104 are the same as those in the first embodiment.

  When the user who owns the mobile terminal 101 inputs an instruction to change the output destination of the media data of the other communication terminals 102 and 103 to the mobile terminal 101 to the input / output unit 202, this is instructed to the overall control unit 203.

  Next, the mobile terminal 101 uses the function installed in the capability information transmission / reception unit 204 via the proximity wireless transmission / reception unit 205 to inquire about the terminal capabilities of the communication terminal 102 and the communication terminal 103 in the PAN 105. When receiving the inquiry about the terminal capability from the mobile terminal 101, the capability information transmitting / receiving unit 204 of the communication terminals 102 and 103 creates the own terminal capability stored in the overall control unit 203 as a response, and the created response is the mobile terminal 101. Send to address.

  When the overall control unit 203 of the mobile terminal 101 detects the reception of the terminal capability query response, the input / output unit 202 outputs the result on the screen (S902).

  In the present embodiment, a user having mobile terminal 101 inputs an instruction to change voice data of communication terminal 102 to mobile terminal 101 to input / output unit 202 based on the screen output. The mobile terminal 101 notifies the overall control unit 203 of an output destination change instruction for the input media data. Then, the mobile terminal 101 uses the terminal change transmission / reception unit 600 to create a media output destination change message. As shown in FIG. 7B, the media data output destination change message generated here is Exchange 700, the address of the mobile terminal 101 as the operation source address, the address of the communication terminal 102 as the operation destination address, and the G type as the data type. . 711. The mobile terminal 101 transmits the created message to the communication terminal 103 via the proximity wireless transmission / reception unit 205 by the terminal change transmission / reception unit 600 (S903).

  When the communication terminal 103 detects the reception of the media data output destination change message, the session control unit sets the INVITE method addressed to the communication terminal 104 whose transmission destination of the audio data is the mobile terminal address 101 without changing the transmission destination of the video data. 207, and transmitted via the network transmission / reception unit 200 (S904).

  When the communication terminal 104 detects reception of the INVITE method, the session control unit 207 creates and transmits a response to the INVITE method and updates the session DB 209.

  Then, the communication terminal 104 changes the output destination of the media data using the data transmission / reception unit 201 in accordance with the SDP described in the body of the received INVITE method. As a result, the session DB 209 is rewritten from FIG. 9C to FIG. 9D (S904). That is, the output destination of the video data whose data type is MPEG4 remains the communication terminal 103 (S905), and the data type is G.264. The output destination of the audio data 711 is changed from the communication terminal 102 to the mobile terminal 101 (S906).

  When the communication terminal 103 detects that the INVIT method response has been received, the terminal switching unit 207 updates the session DB 209. Although there is no change in the media data received by the communication terminal 103, since the output destination of the audio data of the same service is changed from the communication terminal 103 to the mobile terminal 101, the session DB 209 of the communication terminal 103 is shown in FIG. Rewriting from (a) to FIG. 9 (b).

  Through the above processing, it becomes possible to change the output destination of the audio data of the videophone that has been transmitted and received between the communication destination terminal 104 and the communication terminal 102 to the mobile terminal 101 that has not participated in the videophone. .

  In the second embodiment, by providing the terminal change transmission / reception unit 600 that creates and transmits a change request for the output destination of media data, the mobile terminal 101 that has not received the service configures the PAN 105, and a plurality of media It is possible to change at least one output destination of media data while receiving a multimedia service composed of data.

  As a result, the user can change the output destination of the media data to the mobile terminal 101 that has not received the service. By changing to the mobile terminal 101, it becomes possible to carry part of the service and to improve the convenience for the user to enjoy the service.

(Third embodiment)
FIG. 10 is a diagram illustrating a configuration of the mobile terminal 101 according to the third embodiment. Note that the communication terminals 102 to 104 have the same configuration as the mobile terminal 101.

  The configuration of the mobile terminal 101 according to the third embodiment is basically the same as that of the mobile terminal 101 according to the first embodiment, except that a copy request transmission / reception unit 1000 is further provided. .

  The duplication request transmission / reception unit 1000 is provided between the overall control unit 203 and the proximity wireless transmission / reception unit 205. When receiving a media data replication request from a communication terminal that configures the PAN 105, the replication request transmission / reception unit 1000 issues an instruction to the overall control unit 203. In addition, the replication request transmission / reception unit 1000 transmits an instruction from the overall control unit 203 to the communication terminals constituting the PAN 105. In the present embodiment, “duplicate” means that any media data among services used by other communication terminals is also used by the mobile terminal 101 as its own terminal. For this reason, other communication terminals that have used the copied media data continue to use the media data after copying.

  FIG. 11A is a data configuration example of a media data duplication request message transmitted and received by the terminal change transmission / reception unit 1000 via the proximity wireless transmission / reception unit 205. The media data copy request message has Copy 1100 indicating that the request is a copy request and media data copy destination information 1101 indicating the output destination of the copied media data. The media data replication destination information 1101 includes an operation source address that is a media data replication source address, an operation destination address that is a media data replication destination address, and a media data type to be replicated. There are as many pieces of media data duplication destination information 1101 as the number of media data to be duplicated.

  FIG. 12 is a diagram illustrating an operation of adding an output destination of copied media data. In the state before the addition, MPEG4 video data is transmitted and received between the communication terminal 103 and the communication terminal 104 (S1300). 711 audio data is transmitted and received (S1301). In the third embodiment, an example in which an output destination of copied media data is added from this state will be described. In the following description, as in the first embodiment, SIP is used as a session control protocol, and RTP is used as a media data transmission / reception protocol such as audio and video. The terminal capabilities possessed by the mobile terminal 101 and the communication terminals 102 to 104 are the same as those in the first embodiment.

  When a user possessing the mobile terminal 101 inputs an instruction to move the copy of media data to the mobile terminal 101 to the input / output unit 202, the copy instruction is notified to the overall control unit 203.

  Next, the mobile terminal 101 inquires the terminal capabilities of the communication terminal 102 and the communication terminal 103 in the PAN 105 via the proximity wireless transmission / reception unit 205 using a function installed in the capability information transmission / reception unit 204. When the capability information transmitting / receiving unit 204 of the communication terminals 102 and 103 receives the inquiry about the terminal capability, the communication terminals 102 and 103 create their own terminal capability stored in the overall control unit 203 as a response, and the generated response is the mobile The data is transmitted to the terminal 101 via the proximity wireless transmission / reception unit 205.

  When the overall control unit 203 of the mobile terminal 101 detects the reception of the terminal capability query response, the input / output unit 202 outputs the result (S1302).

  In the present embodiment, the user possessing the mobile terminal 101 inputs an instruction to copy the voice data of the communication terminal 102 to the mobile terminal 101 to the input / output unit 202 based on the screen output. The mobile terminal 101 notifies the overall control unit 203 of a copy instruction for the input media data. Then, the mobile terminal 101 creates a media data copy message by the copy request transmission / reception unit 1000.

  As shown in FIG. 11B, the media data copy message created here includes Copy 1100, the address of the mobile terminal 101 as the operation source address, the address of the communication terminal 102 as the operation destination address, and the G. 711. The mobile terminal 101 transmits the created media data replication message to the communication terminal 103 via the proximity wireless transmission / reception unit 205 by the replication request transmission / reception unit 1000 (S1303).

  When the communication terminal 103 detects reception of the media data copy message in the copy request transmission / reception unit 1000, the transmission destination of the received video data and audio data is not changed, and the output destination address of the audio data is analyzed. Here, the output destination address is analyzed to be the address of the mobile terminal 101. Next, the overall control unit 203 requests the terminal switching unit 208 to create a REFER method addressed to the communication terminal 104. The terminal switching unit 208 transmits the created REFER method to the communication terminal 104 via the network transmission / reception unit 200 (S1304).

  At this time, in order for the communication terminal to receive a plurality of copies of media data, the REFER method may use the data configuration shown in FIG. 3A described in the first embodiment. Easy to analogize.

  When the communication terminal 104 detects that the REFER method is received, the terminal switching unit 207 creates the SDP stored in the body of the REFER method as the SDP of the INVITE method, and sends the network transmission / reception unit 200 to the mobile terminal 101. Send through. Further, when the communication terminal 104 detects that the terminal switching unit 208 has transmitted the INVITE method, the communication terminal 104 changes the output destination of the media data in accordance with the SDP described in the INVITE method (S1305).

  When the mobile terminal 101 detects reception of the INVITE method, the terminal switching unit 208 creates an INVITE method response and transmits it to the communication terminal 104.

  In addition, the mobile terminal 101 sets a data transmission destination address written in the SDP in the data transmission / reception unit 201 to prepare for voice data transmission / reception.

  When the communication terminal 104 detects the reception of the INVITE method response, the terminal switching unit 207 updates the session DB 209, and the terminal switching unit 208 creates a NOTIFY method as a response to the REFER method and transmits it to the communication terminal 103. To do. In addition, the data transmission / reception unit 201 of the communication terminal 104 transmits a copy of the audio data to be transmitted to the communication terminal 102, and conversely requests a preparation so that the audio data from the communication terminal 102 can be received.

  As a result, the session DB 209 of the communication terminal 104 is rewritten from FIG. 13B to FIG. 13C, and data transmission / reception between the communication terminal 102 and the communication terminal 103 used before the duplication processing is not changed. (S1306, S1307), the voice data added by the duplication processing is transmitted to the mobile terminal 101 (S1308).

  When the mobile terminal 101 detects reception of a NOTIFY method response, the terminal switching unit 208 updates the session DB 209. Thereby, the session DB 209 is rewritten from FIG. 13A to FIG. 13D, and a description about transmission / reception of audio between the communication terminal 104 and the mobile terminal 101 is added.

  Through the above processing, the audio data of the videophone that has been transmitted / received between the communication terminal 104 and the communication terminal 102 can be designated from the mobile terminal 101 and can be received.

  In the third embodiment, a copy request transmission / reception unit 1000 capable of transmitting a media data copy request is provided, so that a message to be transmitted to each communication terminal includes a communication in charge of each media data among the services being used. The terminal can be described. Accordingly, the media data used by the communication terminals constituting the PAN 105 can be made available by instructing the other communication terminals in the PAN to copy the media data.

  Further, the media data being received by the stationary communication terminal can also be received by the mobile terminal 101, that is, a part of the media data being communicated can be carried, so that convenience for the user to enjoy the service can be improved. .

  Although the communication terminal of the present invention has been described in detail with reference to the embodiment, the present invention is not limited to the above-described embodiment.

  In the first to third embodiments, SIP (Session Initiation Protocol) is used for session control via the IP network 100, but any session control protocol in the IP network may be used, and the present invention is not limited to SIP.

  The terminal capability in the first to third embodiments refers to the overall capability related to the communication terminal, such as the codec / encoding type of media data, the screen size, and the installed application. Moreover, the protocol for acquiring the terminal capability is not limited.

  Further, in the first to third embodiments, the communication terminal 102 and the communication terminal 103 are prepared for transmission / reception of media data, that is, for the preparation methods such as codec / encoding to the data transmission / reception unit 201 and transmission / reception address. There is no particular limitation. Therefore, preparation for transmission / reception may be prepared from a state in which the power is turned on, or may be prepared when the capability information transmission / reception unit 204 notifies the other terminal of its own terminal capability, or the communication terminal 103 may use the INVITE method. By receiving (S503), the communication terminal 103 uses the close proximity wireless communication unit 205 to notify the communication terminal 102 of information such as a transmission / reception address and prepare for reception at the same time as preparing itself. Good.

  In the first to third embodiments, the communication terminal 102 also has the session control 207 and the terminal switching unit 208. However, neither of them may hold, that is, the switching destination in the service receiving terminal switching. It is sufficient that at least one of the communication terminals has the function.

  In the first to third embodiments, an access range such as access authentication and an internal resource available range may exist between the mobile terminal 101, the communication terminal 102, and the communication terminal 103.

  In the first embodiment, when a mobile terminal discovers a communication terminal having a terminal capability superior to its own terminal capability, the service reception terminal is automatically switched to a plurality of communication terminals. Alternatively, when the terminal capability of the communication terminal constituting the PAN 105 is acquired, the user may be notified by GUI / alarm or the like via the input / output unit 202, and the user may select whether or not to switch, The user's intention for switching may be stored in advance as a profile in the mobile terminal, and is not particularly limited.

  In the first embodiment, the communication terminal 103 is used as the switching destination communication terminal. However, the communication terminal 102 may be used, and the process at that time can be easily analogized.

  In the second and third embodiments, the intention of the user holding the mobile terminal is determined by changing the output destination of the media data by interactive input. However, the intention of the user is stored in the mobile terminal as a profile. It is also possible to make the input automatic.

  In the second embodiment, a new session is not opened for the mobile terminal 101, and only the output destination of the media data is changed while the session of the communication terminal 103 is maintained. However, a new session may be opened. .

  Further, in the third embodiment, a new session is established for the mobile terminal 101. However, it is not necessary to change only the output destination of the media data while maintaining the session of the communication terminal 103, and not newly establish a session. .

  Note that transition of session connection includes switching, changing, and copying of media data.

  As described above, according to the present invention, it is possible to improve the user's convenience regarding service enjoyment, and it is useful as a communication terminal that realizes switching to an optimal communication terminal and service mobility.

The figure which shows the function structure of the communication terminal in 1st Embodiment. The figure which shows the whole structure of embodiment (A) The figure which shows the example of a data structure of a terminal switching message (b) The figure which shows the specific example of a terminal switching message (A) The figure which shows the data structural example of session DB which the communication terminal in 1st Embodiment hold | maintains (b) The figure which shows the data in session DB of the mobile terminal before switching in 1st Embodiment (c) The figure which shows the data of session DB of the communication terminal before switching in 1st Embodiment (d) The figure which shows the data of session DB of the communication terminal before switching in 1st Embodiment (e) 1st implementation Which shows the data of session DB of the communication terminal after switching in the form of The figure which shows the terminal switching sequence in 1st Embodiment The figure which shows the function structure of the communication terminal in 2nd Embodiment. (A) The figure which shows the example of a data structure of a media output destination change message (b) The figure which shows the specific example of a media output destination change message The figure which shows the media output destination change sequence in 2nd Embodiment (A) The figure which shows the data of session DB of the communication terminal before switching in 2nd Embodiment (b) The figure which shows the data of session DB of the communication terminal after switching in 2nd Embodiment (c) The figure The figure which shows the data of session DB of the communication terminal before switching in 2 embodiment (d) The figure which shows the data of session DB of the communication terminal after switching in 2nd Embodiment The figure which shows the function structure of the communication terminal in 3rd Embodiment. (A) The figure which shows the data structural example of the media duplication message utilized in 3rd Embodiment (b) The figure which shows the specific example of a media duplication message The figure which shows the media duplication sequence in 3rd Embodiment (A) The figure which shows the data of session DB of the communication terminal before duplication in 3rd Embodiment (b) The figure which shows the data of session DB of the communication terminal after duplication in 3rd Embodiment (c) The figure The figure which shows the data of session DB of the communication terminal before duplication in 3 embodiment (d) The figure which shows the data of session DB of the communication terminal after duplication in 3rd Embodiment

Explanation of symbols

100 IP network 101 Mobile terminal 102 Communication terminal 103 Communication terminal 104 Communication terminal 105 PAN
DESCRIPTION OF SYMBOLS 200 Network transmission / reception part 201 Data transmission / reception part 202 Input / output part 203 Overall control part 204 Capability information transmission / reception part 205 Proximity wireless transmission / reception part 206 Service terminal determination part 207 Session control part 208 Terminal switching part 209 Session DB
600 Terminal change transmission / reception unit 1000 Replication request transmission / reception unit

Claims (6)

A terminal capability inquiry means for inquiring the terminal capabilities of other communication terminals constituting the personal area network during a session connection of a service consisting of a plurality of media data with a communication partner terminal that is a communication partner;
For each of the plurality of media data, a service receiving terminal that is a communication terminal for transmitting and receiving the media data is selected based on the terminal capability of the other communication terminal and the terminal capability of the own terminal obtained by the terminal capability inquiry means A communication terminal selection means for
A transition message for transferring a session connection for communication between at least one service receiving terminal selected by the service receiving terminal selected by the communication terminal selecting means and the communication counterpart terminal is sent to the selected service. Session control means for transmitting to the receiving terminal;
A communication terminal comprising:   The communication terminal according to claim 1, wherein the transition message includes the selected service receiving terminal as receiving destination information for each media data.   In response to the transition message by the session control means, after a session between the service receiving terminal and the communication partner terminal is connected, a message for disconnecting the session with the communication partner terminal is transmitted to the communication partner terminal. The communication terminal according to claim 1, further comprising a transmission unit. Request to transfer the session connection and the receiving destination of the media data from another communication terminal that is in the session connection of the service composed of a plurality of media data with the communication partner terminal that constitutes a personal area network Receiving means for receiving a transition message in which is described,
Session control means for specifying media data specified in the transition message and transmitting a message for connecting a session with the communication partner terminal;
A communication terminal comprising: Media data inquiry means for inquiring the service receiving terminal about the information of the media data being communicated when the service receiving terminal that constitutes the personal area network together with the own terminal is connected to the communication partner terminal. When,
Based on the media data being communicated obtained by the media data inquiry means and the terminal capability of the own terminal, it is possible to determine whether there is media data that can be communicated by the own terminal,
A message for instructing output switching of the media data from the session connection between the service receiving terminal and the communication partner terminal to the own terminal when it is determined by the communicable medium determining means that there is a communicable medium A session switching request transmission / reception means for transmitting a message for changing the output destination of media data from the service receiving terminal to the communication partner terminal according to the terminal capability instructed by the service receiving terminal. ,
A communication terminal comprising: Media data inquiry means for inquiring the service receiving terminal about the information of the media data being communicated when the service receiving terminal that constitutes the personal area network together with the own terminal is connected to the communication partner terminal. When,
Based on the media data being communicated obtained by the media data inquiry means and the terminal capability of the own terminal, it is possible to determine whether there is media data that can be communicated by the own terminal,
When it is determined by the communicable media determining means that there is media data that can be communicated, the media data is a copy of the media data designating the session connection between the service receiving terminal and the communication partner terminal to the own terminal. A session for transmitting a message instructing transmission to the service receiving terminal, and transmitting a message of output destination duplication of media data from the service receiving terminal to the communication partner terminal according to the terminal capability instructed by the service receiving terminal A copy request transmission / reception means;
A communication terminal comprising:

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