JP2005110040A - Communication terminal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication terminal device of which the process load of a body is reduced by preventing the switching of sessions on an application even if a communication infrastructure used for connection to the other station is switched. <P>SOLUTION: A communication terminal device 1 switches a session that connects a session CT to NICa-NICd of a physical layer 21 in a protocol layer 22 when changing a communication infrastructure used for connection to the other station. By this, even if the communication infrastructure used for connection to the other station is changed, no switching occurs with a session C 1a-Cna that connects application programs dev-1 to dev-n to the protocol layer 22. Thus, a session is not switched even if the communication infrastructure used for connection to the other station is switched on the application programs dev-1 to dev-n of the communication terminal device 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a communication terminal device that selects a communication infrastructure used for connection with a partner station that performs inter-application communication from a plurality of types of available communication infrastructure.

  Conventionally, there has been a communication terminal device that can select a communication infrastructure used for connection with a partner station that performs communication between applications from a plurality of types of available communication infrastructure. This communication terminal device includes a communication physical medium (network interface card (NIC), etc.) corresponding to each available communication infrastructure (for example, a wireless communication network, a public line network, a mobile phone network, a wired network network). Yes. In other words, the communication infrastructure used for connection with the other station can be selected from the communication infrastructure provided with the corresponding communication physical medium.

Further, Patent Document 1 proposes an apparatus that automatically selects a communication path (a connected provider or the like) according to a selected communication infrastructure.
JP 2000-13461 A

  However, since the mobile communication terminal device moves with the user, even if it is connected using the optimal communication infrastructure when connecting to the other station that performs inter-application communication, The connection with the station cannot be maintained, and the connection with the other station may be lost. For example, when the communication terminal device (user) moves out of the wireless communication area when connected to the other station by spread spectrum system (SS system) or wireless communication such as Bluetooth, the connection with the other station is disconnected. In such a case, reconnection to the other station is performed using another communication infrastructure, and this reconnection causes session switching on the application. For this reason, the communication terminal device has a problem in that processing associated with session switching occurs, increasing the processing load on the main body.

  Further, the conventional communication terminal device has a configuration in which a user selects a communication infrastructure used for connection with a partner station that performs inter-application communication from a plurality of types of communication infrastructure that can be used in the main body. For this reason, when a user selects a communication infrastructure to be used for connection with a partner station that performs inter-application communication, the user recognizes a communication infrastructure that can be connected to the partner station, or a communication infrastructure that can be connected. You must recognize which communication infrastructure is the best. Further, when the connection with the partner station is disconnected for the above-described reason, it is necessary to reselect which communication infrastructure is used to connect to the partner station. As described above, the conventional communication terminal device has a problem that it causes a user to perform a complicated operation and the operability is not good.

  An object of the present invention is to provide a communication terminal apparatus that reduces the processing load of the main body by preventing session switching on the application even when the communication infrastructure used for connection with the partner station is switched. is there.

  Another object of the present invention is to provide a communication terminal device that improves user operability by automatically selecting a communication infrastructure used for connection with a partner station according to the situation at that time. To do.

  The communication terminal device of the present invention has the following configuration in order to solve the above problems.

(1) In a communication terminal device that performs inter-application communication with a partner station,
A communication infrastructure selection means for selecting a communication infrastructure to be used for connection with a partner station from a plurality of types of available communication infrastructure;
Connection control means for connecting to the counterpart station using a communication physical medium corresponding to the communication infrastructure selected by the communication infrastructure selection means,
The connection control means is arranged between the main body side application and the communication physical medium, fixes a session with the main body side application, and transfers the session with the communication physical medium to the communication infrastructure selected by the communication infrastructure selection means. Switch accordingly.

  In this configuration, the communication infrastructure selection means selects a communication infrastructure to be used for connection with a partner station from a plurality of types of communication infrastructure that can be used in the main body. A communication infrastructure in which a medium (for example, a network interface card (NIC)) is built in or connected (externally attached) to the main body. In other words, a communication infrastructure in which a corresponding communication physical medium is not built in or connected is a communication infrastructure that cannot be used. The connection control means connects to the partner station using the communication infrastructure selected by the communication infrastructure selection means. This connection control means is arranged between the main body side application and the communication physical medium, and fixes a session with the main body side application. On the other hand, the session with the communication physical medium is switched according to the communication infrastructure used for connection with the other station.

  For this reason, when the connection control means switches the session with the communication physical medium in accordance with the communication infrastructure used for connection with the counterpart station, the communication infrastructure used for connection with the counterpart station is switched. At this time, since the session between the main body side application and the connection control means is fixed, session switching does not occur on the main body side application. Therefore, when the connection with the partner station is disconnected, even if the connection to the partner station is reestablished using another communication infrastructure, the processing associated with the session switching does not occur. Therefore, the processing load on the main body can be reduced.

  The communication infrastructure selection means may be configured so that the user selects the communication infrastructure used for connection with the other station, but automatically selects the communication infrastructure used for connection with the other station according to the situation at that time. With this configuration, the user's operability can be improved without causing the user to perform complicated operations.

(2) The connection control means monitors the connection state with the partner station during the connection with the partner station, determines whether the connection with the partner station can be maintained,
The communication infrastructure selection means, when the connection control means determines that the connection with the counterpart station cannot be maintained, the connection with the counterpart station from other communication infrastructures available to the communication infrastructure selection means. Re-select another communications infrastructure to use for
Further, the connection control means reconnects to the partner station using a communication physical medium corresponding to the communication infrastructure reselected by the communication infrastructure selection means.

  In this configuration, when it is determined that the communication infrastructure used for connection with the partner station at that time cannot maintain the connection with the partner station, the communication station automatically connects to the partner station using another communication infrastructure. The user's operability can be further improved without causing the user to perform an operation related to reconnection with the counterpart station.

(3) The connection signal control means detects whether or not the state of each communication infrastructure is connectable to the partner station,
The communication infrastructure selection means selects a communication infrastructure used for connection with the partner station from among the communication infrastructures in which the connection control means has detected that it is connectable to the partner station.

  In this configuration, the communication infrastructure that cannot be connected to the partner station at that time is not selected, and the processing for connection with the partner station can be performed smoothly.

(4) Provided with priority storage means for storing the communication infrastructure with priorities for each communication infrastructure,
The communication infrastructure selecting means selects the communication infrastructure having the highest priority stored in the priority order storage means from among the communication infrastructures in which the connection control means has detected that it is connectable to the counterpart station. The communication infrastructure used for connection with the other station is selected.

  In this configuration, the priority order storage means stores the priority order for each communication infrastructure, and the communication infrastructure selection means is in a state in which connection with the partner station is possible, and the communication infrastructure with the highest priority order is selected. It is possible to always use the optimal communication infrastructure for connection with the other station.

  The communication infrastructure priority may be determined based on, for example, communication speed or communication cost.

(5) The communication infrastructure selection means is in a state in which another communication infrastructure having a higher priority than the communication infrastructure used for connection with the partner station can be connected with the partner station during connection with the partner station. Is detected by the above connection control means, this other communication infrastructure is selected as a communication infrastructure used for connection with the other station,
The connection control means reconnects to the partner station using a communication physical medium corresponding to the communication infrastructure selected by the communication infrastructure selection means.

  In this configuration, when connecting to the partner station using one of the communication inflations, if it becomes possible to connect to the partner station using a communication infrastructure with a higher priority due to a change in the situation, this priority order is changed. Since the connection is switched to a connection using a high communication infrastructure, it is possible to always use an optimal communication infrastructure for connection with a partner station.

  In addition, even if the communication infrastructure used for connection with the partner station is switched in this way, the session switching does not occur on the main body side application as described above, so that the processing associated with the session switching does not occur.

(6) In a communication terminal device that performs inter-application communication with a partner station,
A communication infrastructure selection accepting means for accepting selection of a communication infrastructure used for connection with a partner station from a plurality of types of available communication infrastructures;
Connection control means for connecting to the counterpart station using a communication physical medium corresponding to the communication infrastructure received by the communication infrastructure selection accepting means,
The connection control unit is disposed between the main body side application and the communication physical medium, fixes a session with the main body side application, and receives a selection of the session with the communication physical medium by the communication infrastructure selection receiving unit. Switch according to infrastructure,
The communication infrastructure selection accepting means outputs whether or not the state of each communication infrastructure used for connection with the partner station is connectable with the partner station.

  In this configuration, the communication infrastructure selection accepting means accepting means outputs the status of each communication infrastructure by outputting whether or not the status is connectable to the other station for each communication infrastructure used for connection with the other station. The communication infrastructure used by the user to connect to the other station is accepted. Therefore, user operability can be improved.

  According to the present invention, even if the communication infrastructure used for connection with the partner station is switched, the session is not switched on the application, so that the processing load on the main body can be reduced. Whether the communication infrastructure used for connection with the partner station is automatically selected according to the situation at that time, or whether the state is connectable with the partner station for each communication infrastructure used for connection with the partner station Is output and the user selects it, so that the operability of the user can be improved. Furthermore, the communication infrastructure used for connection with the counterpart station can be appropriately switched according to a change in the situation without increasing the processing load of the main body.

  Hereinafter, a communication terminal apparatus according to an embodiment of the present invention will be described.

  FIG. 1 is a diagram showing a configuration of a network system to which a communication terminal apparatus according to an embodiment of the present invention is applied. In FIG. 1, 1 is a communication terminal apparatus according to an embodiment of the present invention, and 2 is a server apparatus. Here, the server device 2 corresponds to the counterpart station referred to in the present invention. The communication terminal device 1 is a mobile terminal carried by a user. The server device 2 is connected to a network 3 such as a LAN. Reference numeral 4 denotes a wireless master device that is an access point of the communication terminal device 1, and 5 denotes a HUB that connects the wireless master device to the network 3. Reference numeral 6 denotes a public line network, and reference numeral 7 denotes a router. Reference numeral 8 denotes a cellular phone network. The server device 2 is provided with a wireless communication unit 2a that performs wireless communication by Bluetooth. The network 3 is also connected with an information processing device such as a personal computer (not shown) that can search and update data managed by the server device 2.

  This network system is a system that manages the inventory status of goods and the delivery status of packages. For example, the communication terminal device 1 uses a short-distance radio when receiving or shipping goods in a warehouse, and uses the public line network 6 or the cellular phone network 8 when delivering goods by truck or the like. It uses and communicates with the server apparatus 2. The server device 2 manages the inventory status and delivery status of the articles based on the receipt data, shipping data, and delivery data sent from the communication terminal device 1. A user inputs shipment data or the like into the communication terminal device 1.

  FIG. 2 is a diagram showing the configuration of the communication terminal apparatus according to the embodiment of the present invention. The mobile terminal device 1 includes a control unit 11 that controls the operation of the main body, a first communication unit 12 that performs wireless communication using a spread spectrum method (so-called SS wireless method), and a second that performs wireless communication using Bluetooth (BT). Communication unit 13, a third communication unit 14 connected to the mobile phone network 8 via a wireless base station (not shown), a fourth communication unit 15 connected to the network 3 (HUB5) by wire, An operation unit 16 that allows an operator to perform an input operation and a display unit 17 that displays a screen corresponding to an input to the main body are provided. The first communication unit 12 includes a network interface card a (hereinafter referred to as NICa) (communication physical medium referred to in the present invention) that performs wireless communication using the SS wireless method, and the second communication unit 13 includes: The third communication unit 14 has a NICc for connecting to the mobile phone network 8 via the base station, and the fourth communication unit 15 is connected to the network 3. It has NICd for connecting by wire. With this configuration, the communication terminal device 1 according to this embodiment includes four types of communication infrastructures: an SS wireless network (SS wireless communication network), a BT network (BT communication network), a mobile phone network 8, and a wired network network. It can be used for connection with the server device 2.

  Note that the communication terminal device 1 only needs to have a configuration in which a plurality of types of communication infrastructures can be used, and the types of communication infrastructures that can be used are not limited to the four types described above, but other types of communication infrastructures. May be used, or may be configured such that one or more of the communication infrastructures described above cannot be used.

  FIG. 3 is a diagram for explaining the hierarchical structure of the communication terminal apparatus according to the embodiment of the present invention. In FIG. 3, reference numeral 21 denotes a physical layer corresponding to NICa to NICd provided in the first communication unit 12 to the fourth communication unit 15. A protocol layer 22 corresponds to a protocol such as TCP / IP that controls data communication with the connected partner station. Reference numeral 23 denotes a communication control layer for selecting a communication infrastructure used for connection with a partner station, switching a communication infrastructure used for connection with the partner station, and the like. Reference numeral 24 denotes an application layer in which n application programs dev-1 to dev-n are located.

  As shown in FIG. 3, the application programs dev-1 to dev-n located in the application layer 4 are connected to the protocol layer 22 through their own sessions C1a to Cna, and pass through the protocol layer 22 to communicate with the communication control layer. 23 is connected to the protocol layer 22 through the communication control layer 23 and reconnected to the protocol layer 22 through the unique session CT. The protocol layer 22 establishes a session with NICa to NICd of the corresponding physical layer 21 according to the communication infrastructure used for connection with the counterpart station.

  When switching the communication infrastructure used for connection with the counterpart station, the communication terminal device 1 switches the session connecting the session CT and the NICa to NICd of the physical layer 21 in the protocol layer 22. In other words, even if the communication infrastructure used for connection with the partner station is switched, the sessions C 1a to Cna that connect the application programs dev-1 to dev-n and the protocol layer 22 are not switched. For this reason, in the application programs dev-1 to dev-n of the communication terminal device 1, even if the communication infrastructure used for connection with the counterpart station is switched, the session is not switched, so that the process associated with the session switching does not occur. Therefore, it is possible to reduce the processing load of the main body by switching the communication infrastructure used for connection with the partner station.

  The control unit 11 is provided with a memory (not shown) that stores the table shown in FIG. FIG. 4A is a priority order table in which the wired order of available communication infrastructures is registered. Here, an example is shown in which the priority is increased in the order of the mobile phone network 8, the BT network, the SS wireless network, and the wired network network. This priority table can be arbitrarily set by the user on the operation unit 16 for the communication infrastructure that can be used in the communication terminal device 1. For example, the user can arbitrarily set a higher priority for a communication infrastructure with a higher communication speed or a higher priority for a communication infrastructure with a lower communication cost. FIG. 4B is a session table in which a session with the protocol layer 22 is registered for each of the application programs dev-1 to dev-n located in the application layer 24. This session table connects the session C1a to Cna with the protocol layer 22 and the communication control layer 23 through the protocol layer 22 for each of the application programs dev-1 to dev-n located in the application layer 24. It is a table in which sessions CA to CN are registered in association with each other. FIG. 4C is a connection availability table for registering whether the communication terminal device 1 is currently in a state where it can be connected to the partner station for each available communication infrastructure. Further, the communication terminal device 1 includes a connection management table (not shown) for managing the connection state with the partner station, that is, the session with the partner station.

  Two or more of the priority order table, the session connection table, the connection availability table, and the session management table may be combined into one table.

  Next, the operation of the communication terminal device 1 according to the embodiment of the present invention will be described. The communication terminal device 1 of this embodiment detects whether the connection with the partner station is possible for each available communication infrastructure regardless of whether the state is connected to the partner station ( s1) The connection availability table is updated based on the detection result (s2), and the communication infrastructure monitoring process shown in FIG. 5 is periodically performed. For example, regarding the communication infrastructure that is not used for connection with the other station at that time, is it possible to access the other station using that communication infrastructure and connect to the other station from the communication state at that time? Detect if. Further, for the communication infrastructure used for connection with the other station at that time, it is detected from the communication state with the connected other station whether the connection with the other station is possible.

  Therefore, the communication terminal device 1 can determine which communication infrastructure can be used for connection with the partner station and which communication infrastructure cannot be used for connection with the partner station, among the available communication infrastructures, based on the connectability table. I can confirm.

  The timing for repeating this communication infrastructure monitoring process is preferably as short as possible, but if it is too short, the processing load on the communication terminal device 1 main body is increased, and therefore it is appropriate to repeat it at intervals of several seconds to several tens of seconds.

  Next, connection processing for connecting to the server apparatus 2 in order to perform inter-application communication with the server apparatus 2 will be described. FIG. 6 is a flowchart showing the operation at the time of connection with the server device in the communication terminal device according to the embodiment of the present invention. The communication terminal device 1 searches the connection availability table shown in FIG. 4C and extracts a communication infrastructure that can be connected to the other station (s11). Then, using the priority order table shown in FIG. 4A, the communication infrastructure with the highest priority order selected from the communication infrastructures extracted in s11 is selected as the communication infrastructure used for connection with the server device 2 that is the counterpart station. (S12). The communication terminal device 1 connects to the server device 2 using the NIC corresponding to the communication infrastructure selected in s2 (s13). In s13, the communication terminal device 1 establishes a session connecting the session CT and the NICa to NICd of the physical layer 21 corresponding to the selected communication infrastructure in the protocol layer 22 as illustrated in FIG.

  Note that the session with the communication control layer 23 is fixed for each of the application programs dev-1 to dev-n on the main body side.

  When the communication infrastructure used for connection with the server device 2 is a wired network network, the communication terminal device 1 communicates with the server device 2 via the HUB 5 and the network 3 using NICd provided in the fourth communication unit 15. To do. Further, when the communication infrastructure used for connection with the server device 2 is a BT network, the server device 2 is connected to the server device 2 via the wireless communication unit 2 a provided in the server device 2 using the NICb provided in the second communication unit 13. Communicate with. Further, when the communication infrastructure used for connection with the server device 2 is an SS wireless network, the NICa provided in the first communication unit 12 is used to communicate with the server device 2 via the wireless master device 4, the HUB 5, and the network 3. To do. Further, when the communication infrastructure used for connection with the server device 2 is the mobile phone network 8, the NICc provided in the third communication unit 14 is used to provide the mobile phone network 8, the public line network 6, the router 7, and the network 3. It communicates with the server apparatus 2 via.

  As described above, when the communication terminal device 1 of this embodiment is connected to the server device 2, it is not necessary for the user to select a communication infrastructure used for connection with the server device 2, so that operability can be improved. Further, since the communication infrastructure that can be connected to the server device 2 at that time and has the highest priority is automatically selected, it is possible to connect to the server device 2 using the optimal communication infrastructure at that time.

  By displaying the communication infrastructure extracted in s11 on the display unit 17, the communication infrastructure that can be connected to the server apparatus 2 at that time is notified to the user, and the communication infrastructure used for connection to the server apparatus 2 is determined by the user. You may make it select. In this case, since the user does not need to determine which communication infrastructure can be connected to the server apparatus 2 and which communication infrastructure cannot be connected to the server apparatus 2, operability can be improved.

  Next, a process (connected process) when the communication terminal apparatus 1 according to the embodiment of the present invention is connected to the server apparatus 2 will be described. FIG. 7 is a flowchart showing this connected process. While being connected to the server device 2, the communication terminal device 1 periodically and repeatedly executes this connection process.

  First, the communication terminal device 1 determines whether the connection with the server device 2 can be maintained by the communication infrastructure currently used for the connection with the server device 2 (s21). In s21, not only is it determined that the connection cannot be maintained when the connection with the server device 2 is disconnected, but the reception level is set to the set level when the SS wireless network or the BT network is used for the connection with the server device 2, for example. It is determined that the connection with the server device 2 cannot be maintained even when (a level at which the connection is broken when the level is further lowered) is reached.

  If the communication terminal device 1 determines that the connection with the server device 2 can be maintained in s21, the server device is included in the communication infrastructure having a higher priority than the communication infrastructure used for the connection with the server device 2 at that time. 2 is determined whether or not there is a communication infrastructure that can be connected to 2 (s22). In s22, the determination is made based on the priority order table and the connectability table shown in FIG. As described above, the communication terminal device 1 periodically determines whether or not each communication infrastructure can be connected to the server device 2 and updates the connection availability table by the communication infrastructure monitoring process shown in FIG.

  If the communication terminal device 1 determines that there is no communication infrastructure that can be connected to the server device 2 in the communication infrastructure having a higher priority than the communication infrastructure used for connection to the server device 2 in s22, This process ends. On the other hand, when it is determined that there is a communication infrastructure that can be connected to the server device 2 in the communication infrastructure having a higher priority than the communication infrastructure used for the connection to the server device 2, the connection to the server device 2 is established. And the communication infrastructure with the highest priority is reselected (s23). Then, the communication terminal device 1 temporarily disconnects from the server device 2 (s24), and reconnects to the server device 2 using the NIC corresponding to the communication infrastructure selected in s23 (s25).

  At this time, as shown in FIG. 3, the communication terminal device 1 switches the session connecting the session CT and NICa to NICd of the physical layer 21 according to the communication infrastructure reselected in s23 in the protocol layer 22. The session is not switched on the main body side application programs dev-1 to dev-n that perform communication between applications with the server apparatus 2. Therefore, even if the communication infrastructure used for connection with the server device 2 is switched, the process associated with the session switching does not occur in the application programs dev-1 to dev-n. Therefore, without increasing the processing load of the apparatus main body, it is possible to connect to the server apparatus 2 using the optimum communication infrastructure at that time and perform inter-application communication with the server apparatus 2. In addition, since the communication infrastructure used for connection with the server device 2 is automatically switched, there is no need for the user to worry about switching the communication infrastructure used for connection with the server device 2. The user's operability can be improved.

  Since the server device 12 authenticates the communication terminal device 1 with an identification code or a unique name, even if the communication infrastructure used for connection with the communication terminal device 2 is switched, the server device 12 is connected to the communication terminal device 1. There is no problem in communication between applications.

  In the above description, if a communication infrastructure having a higher priority than the communication infrastructure used for connection with the server device 2 is in a state where it can be connected to the server device 2, the connection with the server device 2 is automatically established. Is switched to the communication infrastructure with a higher priority, a screen for confirming whether to switch the communication infrastructure is displayed on the display unit 17, and whether to switch the communication infrastructure to the user is displayed on the operation unit 16. You may make it input. Furthermore, it may be possible to set whether to automatically switch the communication infrastructure or to confirm with the user.

  In addition, when the communication terminal device 1 determines that the connection with the server device 2 cannot be maintained in s21, the communication terminal device 1 searches the connection availability table shown in FIG. A communication infrastructure that can be connected to the partner station is extracted (s26). Then, using the priority table shown in FIG. 4A, the communication infrastructure with the highest priority is selected from the communication infrastructures extracted in s26 as the communication infrastructure to be used for connection with the server device 2 that is the counterpart station. (S27). If the connection with the server device 2 is continued (when it is determined that the connection cannot be maintained before the connection is disconnected), the communication terminal device 1 disconnects the connection (s28, s29), and is selected at s27. Reconnect to the server apparatus 2 using the NIC corresponding to the communication infrastructure (s30).

  Also in this case, the communication terminal device 1 switches the session for connecting the session CT and the NICa to NICd of the physical layer 21 according to the communication infrastructure reselected in s27 in the protocol layer 22 as shown in FIG. The session is not switched on the application programs dev-1 to dev-n on the main body side that perform inter-application communication with the server device 2. Therefore, when the connection with the server apparatus 2 cannot be maintained with the connected communication infrastructure, the processing load of the apparatus main body when the communication infrastructure is switched and the connection with the server apparatus 2 is maintained can be reduced.

  In the above description, when the connection with the server device 2 cannot be maintained, the communication infrastructure extracted at step s26 is displayed on the display unit 17 so that the communication infrastructure that can be connected to the server device 2 at that time is displayed to the user. The communication infrastructure used for connection with the server device 2 may be notified and the user may be selected. In this case, since the user does not need to determine which communication infrastructure can be connected to the server apparatus 2 and which communication infrastructure cannot be connected to the server apparatus 2, operability can be improved.

  Moreover, although the said embodiment demonstrated as an example the case where the communication terminal device 1 performed communication between applications between the server apparatuses 2 connected to the network 3, application is also performed between the communication terminal devices 1 of this embodiment. Intercommunication is also possible. In this case, one communication terminal device 1 executes an operation corresponding to the server device 2 of the above embodiment, and the other communication terminal device 1 has been described in the above embodiment such as determining a communication infrastructure to be used for connection. Perform the action. As a result, there is no increase in processing load due to session switching between the two communication terminal apparatuses 1, and inter-application communication can be performed while always maintaining a connection with an appropriate communication infrastructure.

It is a figure which shows the structure of the network system to which the communication terminal device which is embodiment of this invention is applied. It is a figure which shows the structure of the communication terminal device which is embodiment of this invention. It is a figure which shows the hierarchical structure of the communication terminal device which is embodiment of this invention. It is a figure which shows the table which the communication terminal device which is embodiment of this invention memorize | stores. It is a flowchart which shows the communication infrastructure monitoring process in the communication terminal device which is embodiment of this invention now. It is a flowchart which shows the operation | movement at the time of the connection with the server apparatus in the communication terminal device which is embodiment of this invention. It is a flowchart which shows the process during connection of the communication terminal device which is embodiment of this invention.

Explanation of symbols

1-communication terminal device 2-server device 21-physical layer 22-protocol layer 23-communication control layer 24-application layer

Claims (6)

In a communication terminal device that performs communication between applications with a partner station,
A communication infrastructure selection means for selecting a communication infrastructure to be used for connection with a partner station from a plurality of types of available communication infrastructure;
Connection control means for connecting to the counterpart station using a communication physical medium corresponding to the communication infrastructure selected by the communication infrastructure selection means,
The connection control means is arranged between the main body side application and the communication physical medium, fixes a session with the main body side application, and transfers the session with the communication physical medium to the communication infrastructure selected by the communication infrastructure selection means. A communication terminal device that switches in response. The connection control means monitors the connection state with the partner station during the connection with the partner station, determines whether the connection with the partner station can be maintained,
The communication infrastructure selection means, when the connection control means determines that the connection with the counterpart station cannot be maintained, the connection with the counterpart station from other communication infrastructures available to the communication infrastructure selection means. Reselect another communications infrastructure to use for
The communication terminal apparatus according to claim 1, wherein the connection control unit reconnects to the partner station using a communication physical medium corresponding to the communication infrastructure reselected by the communication infrastructure selection unit. The connection control means detects whether or not the state of each communication infrastructure can be connected to the partner station,
3. The communication infrastructure selection unit selects a communication infrastructure used for connection with a partner station from communication infrastructures in which the connection control unit detects that the connection with the partner station is possible. The communication terminal device according to 1. A priority storage means for storing the communication infrastructure with priorities for each communication infrastructure;
The communication infrastructure selecting means selects the communication infrastructure having the highest priority stored in the priority order storage means from among the communication infrastructures in which the connection control means has detected that it is connectable to the counterpart station. 4. The communication terminal device according to claim 3, wherein the communication terminal device is selected as a communication infrastructure used for connection with the counterpart station. The connection means that the communication infrastructure selection means is in a state in which another communication infrastructure having a higher priority than the communication infrastructure used for connection to the partner station can be connected to the partner station during connection with the partner station. When it is detected by the control means, this other communication infrastructure is selected as a communication infrastructure used for connection with the other station,
5. The communication terminal apparatus according to claim 4, wherein the connection control means reconnects to a partner station using a communication physical medium corresponding to the communication infrastructure selected by the communication infrastructure selection means. In a communication terminal device that performs communication between applications with a partner station,
A communication infrastructure selection accepting means for accepting selection of a communication infrastructure used for connection with a partner station from a plurality of types of available communication infrastructures;
Connection control means for connecting to the counterpart station using a communication physical medium corresponding to the communication infrastructure received by the communication infrastructure selection accepting means,
The connection control unit is disposed between the main body side application and the communication physical medium, fixes a session with the main body side application, and receives a selection of the session with the communication physical medium by the communication infrastructure selection receiving unit. Switch according to infrastructure,
The communication infrastructure selection accepting means is a communication terminal device that outputs whether or not the state of each communication infrastructure used for connection with a partner station is connectable with the partner station.

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