JP4576965B2 - Communication terminal device, network selection method used for the same, and program thereof - Google Patents

Communication terminal device, network selection method used for the same, and program thereof Download PDF

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JP4576965B2
JP4576965B2 JP2004282895A JP2004282895A JP4576965B2 JP 4576965 B2 JP4576965 B2 JP 4576965B2 JP 2004282895 A JP2004282895 A JP 2004282895A JP 2004282895 A JP2004282895 A JP 2004282895A JP 4576965 B2 JP4576965 B2 JP 4576965B2
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network
application software
communication terminal
selection
application
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JP2006054841A (en
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嘉昭 奥山
卓弥 村上
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日本電気株式会社
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Description

  The present invention relates to a communication terminal device, a network selection method used therefor, and a program therefor, and more particularly to a network selection method used when connecting to various networks using a mobile terminal.

  In recent years, with the spread of wireless networks such as mobile phone networks and wireless local area networks (LANs), there has been an increasing demand to connect to various networks using mobile terminal devices.

  Each of the above networks has different characteristics (specifically, communication speed, fee, security level, etc.), so when using the network, it is necessary to select the optimal network that meets the conditions. There is.

  Conventionally, a user of a mobile terminal device often selects the network manually. However, since this reduces convenience, the user's profile and application software that operates on the mobile terminal device (hereinafter referred to as an application). A method of automatically selecting according to the profile of the device has been studied.

  For example, as the above-described network selection method, there has been proposed a method of selecting an optimum network according to the characteristics of transmission data and the characteristics of the communication network when an application in the terminal device issues a communication request ( For example, see Patent Document 1).

JP 09-160855 A

  In the conventional network selection method described above, in a terminal device that can use a plurality of networks, the network selection operation is performed manually by a user, and the terminal device can use a plurality of networks. However, there is a problem that the convenience is lowered.

  In addition, as a conventional network selection method, a method of automatically selecting a network according to network characteristics is proposed as in the technique of Patent Document 1 described above. There is no method for automatically selecting an optimum network by comprehensively judging when a connection request to a network having different quality required by a plurality of applications is issued.

  The connection requests to the networks having different qualities required from the plurality of applications include, for example, connection requests from an application giving priority to high-speed transfer and charge, such as a file download application, and extension VoIP (Voice over Internet Protocol). ) Connection requests from applications that do not require so much speed, such as telephone services, but prioritize low latency and high security. In this case, since the types of required networks are different, there is no method for automatically selecting the optimum network by comprehensively judging it.

  In the technique of the above-described Patent Document 1, it is necessary for the terminal side to know the characteristics of the network that can be used in advance, and the conflict avoidance when a plurality of applications communicate simultaneously is insufficient. Specifically, in the technique of the above-mentioned Patent Document 1, only the communication order is determined and data order control is performed, and it is not possible to select an optimal network that satisfies the requirements of a plurality of applications simultaneously. Furthermore, in the technique disclosed in Patent Document 1, an application agent must be created for each application.

  Further, as a conventional network selection method, it is necessary to know in advance the characteristics of a network that can be connected on the terminal side, but there is no method for automatically acquiring the characteristics of this network.

  Therefore, in the conventional network selection method, a method for automatically determining the characteristics of an available network and a method for selecting a network by comprehensively determining connection requests of a plurality of applications are required. .

  Accordingly, an object of the present invention is to provide a communication terminal apparatus that can solve the above-described problems and can automatically connect / disconnect an optimal network and connect / disconnect the network, and a network selection method and program therefor. is there.

A communication terminal device according to the present invention is a communication terminal device capable of operating a plurality of application software and connectable to a plurality of types of networks,
A selection means for selecting an optimal network according to the context in the own device,
The selection means receives a connection profile describing the selection criteria of the network in the application software from the application software, selects the optimum network based on the connection profile,
Including a communication monitoring manager for monitoring a communication state of the application;
The selection means calculates the priority of the application software from the communication state of the application software by the communication monitoring manager, and selects an optimum network based on the priority .

Another communication terminal device according to the present invention is a communication terminal device capable of simultaneously operating a plurality of application software and connecting to a plurality of types of networks,
A selection means for selecting an optimal network according to the context in the own device ,
The selection means receives a connection profile describing the selection criteria of the network in the application software from the application software, and merges the plurality of connection profiles to select the optimal network,
Including an application manager for monitoring the status of the application;
Calculate the priority of the application software from the state of the application software in the application manager,
The selection means selects an optimal network based on the priority .

The network selection method according to the present invention is a network selection method used for a communication terminal device capable of operating a plurality of application software and connectable to a plurality of types of networks,
The communication terminal device side comprises a step of selecting an optimal network according to the context in the communication terminal device,
In the step of selecting the optimum network, a connection profile describing the selection criteria of the network in the application software is received from the application software, and the optimum network is selected based on the connection profile;
The communication state of the application software is monitored, the priority of the application software is calculated from this state , and the optimum network is selected according to the priority .

Another network selection method according to the present invention is a network selection method for use in a communication terminal device capable of simultaneously operating a plurality of application software and connectable to a plurality of types of networks,
The communication terminal device side comprises a step of selecting an optimal network according to the context in the communication terminal device ,
In the step of selecting the optimum network, a connection profile describing a selection criterion of the network in the application software is received from the application software, and the plurality of connection profiles are merged to select the optimum network,
The state of the application software is monitored, the priority of the application software is calculated from this state, and the optimum network is selected according to this priority .

A program according to the present invention is a program that allows a plurality of application software to operate and to be executed by a computer in a communication terminal device that can be connected to a plurality of types of networks
Including a process of selecting an optimal network according to a context in the communication terminal device,
In the step of selecting the optimum network, a connection profile describing the selection criteria of the network in the application software is received from the application software, and the optimum network is selected based on the connection profile;
The communication state of the application software is monitored, the priority of the application software is calculated from this state , and the optimum network is selected according to the priority .

Another program according to the present invention is a program that allows a plurality of application software to be operated simultaneously and to be executed by a computer in a communication terminal device that can be connected to a plurality of types of networks,
Including a process of selecting an optimal network according to a context in the communication terminal device ,
In the step of selecting the optimum network, a connection profile describing the selection criteria of the network in the application software is received from the application software, and the plurality of connection profiles are merged to select the optimum network.
The state of the application software is monitored, the priority of the application software is calculated from the state, and an optimum network is selected according to the priority .

  That is, the communication terminal device of the present invention enables the communication terminal device to automatically select the optimum network according to the context (situation) in the communication terminal device that can be connected to a plurality of types of networks. It is characterized by.

  More specifically, in the communication terminal device of the present invention, the network agent accepts connection profiles from a plurality of application software (hereinafter referred to as applications), merges the plurality of connection profiles, and creates a merged connection profile. The best network is selected.

  In the communication terminal device of the present invention, when selecting a network, an optimum network is selected by matching the merged connection profile with network characteristic information stored in the network database. Thereafter, the network agent instructs the connection manager to perform network connection work.

  Thereby, in the communication terminal device of the present invention, the network agent automatically selects the network according to the connection profile. Therefore, the communication terminal device automatically selects the optimum network without bothering the user. Can be connected to / disconnected from the network.

  In the communication terminal device of the present invention, when a network connection is requested from an application, the application individually passes the connection profile to the network agent, and the network agent automatically selects the connection network. The optimum network can be automatically selected.

  Furthermore, in the communication terminal device of the present invention, since the network agent is searched after the connection profiles from the applications are merged on the network agent side, the optimum network can be selected even in an environment where a plurality of applications operate simultaneously. It becomes possible.

  Furthermore, in the communication terminal device of the present invention, the network characteristic information is downloaded as necessary using the downloader. Therefore, even if the characteristic information of the network to be connected is not known in advance, the optimal network Selection can be made automatically.

  With the configuration and operation described below, the present invention provides an effect that an optimum network can be automatically selected and connected / disconnected to the network.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a communication terminal apparatus according to the first embodiment of the present invention. In FIG. 1, a communication terminal device 1 is a terminal device for receiving a network service by connecting to a network A101, a network B102, and a network C103, and has the ability to connect to the plurality of networks A101, network B102, and network C103. Yes.

  Examples of the network A 101, the network B 102, and the network C 103 include a wired LAN (Local Area Network), a wireless LAN, a mobile phone network, a PHS (Personal Handy-phone System), an IrDA (Infrared Data Association), and a Bluetooth (registered trademark) serial. There is communication.

  The communication terminal device 1 includes application software (hereinafter referred to as an application) 11, a connection profile 12, a network agent 13, a connection manager 14, a network database 15, a downloader 16, and a recording medium 17. ing.

  The application 11 is a client-server type application that provides a service to a user by connecting to a server using a network. The application 11 can have an arbitrary number of connection profiles 12. The connection profile 12 is data describing network selection criteria, and describes request criteria for the network such as necessary bandwidth, minimum delay, security parameters, and charging limit. Here, it is assumed that the communication terminal device 1 has an arbitrary number of applications 11 and can simultaneously operate a plurality of applications 11.

  The network agent 13 is a component for selecting the network A101, the network B102, and the network C103. The network agent 13 receives the connection profiles 12 from the plurality of applications 11, comprehensively determines this, selects one of the network A 101, the network B 102, and the network C 103, and issues a connection instruction to the connection manager 14.

  When selecting a network, the network agent 13 needs to know the characteristics of the networks A101, B102, and C103. The characteristics of the network A 101, the network B 102, and the network C 103 are stored in the network database 15. The characteristics of each network A101, network B102, and network C103 may be statically stored in advance in the network database 15, or may be downloaded dynamically as necessary. The downloader 16 is a function for downloading network characteristic information using the network and storing it in the network database 15.

  The connection manager 14 has a function of receiving a network connection instruction from the network agent 13 and connecting to an appropriate network A 101, network B 102, or network C 103 in response to the instruction.

  The recording medium 17 stores a program to be executed by the computer when the communication terminal device 1 is configured by a computer (not shown) including a CPU (Central Processing Unit) and a RAM (Read Only Memory).

  2 is a sequence chart showing an internal operation of the communication terminal device 1 of FIG. 1, FIGS. 3 and 4 are diagrams showing the connection profile 12 of FIG. 1, and FIG. 5 is a connection profile shown in FIGS. 12 is a diagram showing an example of merging 12 and FIG. 6 is a diagram showing network characteristic information according to the first embodiment of the present invention. The operation of the communication terminal device 1 according to the first embodiment of the present invention will be described with reference to FIGS. 2 is realized by the CPU of the communication terminal device 1 moving the program of the recording medium 17 to the RAM and executing it.

  The communication terminal device 1 obtains the characteristic information of the network A101, the network B102, and the network C103. The characteristic information of the network A 101, the network B 102, and the network C 103 is statically stored in the network database 15 or downloaded on the spot as necessary. When the characteristic information of the network A101, the network B102, and the network C103 is obtained by downloading, the communication terminal apparatus 1 downloads using the downloader 16 (a1 in FIG. 2), and sets the downloaded characteristic information in the network database 15 ( A2) in FIG.

  When the user activates the application 11, the communication terminal device 1 transmits the use start of the connection profile 12 held by the application 11 itself to the network agent 13 (a3 in FIG. 2). Here, a case where the user starts two applications 11a and 11b will be described. A connection profile 12 transmitted from each application 11a, 11b to the network agent 13 is shown in FIGS.

  FIG. 3 shows a profile a for requesting high-speed transfer and selecting one with a low charge. This profile a is a connection profile of the application 11a, and gives priority to charging with a bandwidth of 10 Mbps or more and a delay of 500 ms or less. For example, a file download application has such a profile a.

  On the other hand, FIG. 4 shows a profile b that does not require much transfer speed, but requires low delay, high security, and QoS (Quality of Service). This profile b is a connection profile of the application 11b, which requires a high bandwidth with a bandwidth of 128 kbps or more, a delay of 50 ms or less, and gives priority to the QoS level. For example, an extension VoIP (Voice over Internet Protocol) telephone service has such a profile b.

  Each time the network agent 13 receives the start of use of the profiles a and b, it merges all the profiles a and b received from the applications 11a and 11b (a4 in FIG. 2). Specifically, a profile that satisfies all the requirements of each profile ab is created. A profile created by merging is shown in FIG.

  In FIG. 5, the merged profile requires a bandwidth of 10 Mbps or more, a delay of 50 ms or less, high security, and priority on charging and QoS level. This merged profile satisfies both the requirements of profile a shown in FIG. 3 and profile b shown in FIG.

  Next, the network agent 13 delivers the merged profile to the network database 15 and requests a search (a5 in FIG. 2). Here, consider a case where the characteristic information shown in FIG. 6 is described in the network database 15 as an example.

  In FIG. 6, the characteristic information of “Wireless LAN A” requires a bandwidth of 20 Mbps, a delay of 30 ms, high security, charging of $ 1.5 / min, and no priority on the QoS level.

  Further, the characteristic information of “Wireless LAN B” requires a bandwidth of 5 Mbps, a delay of 70 ms, high security, charge of 0.5 $ / min, and priority on the QoS level.

  Further, the characteristic information of “IrDA” requires a bandwidth of 512 kbps, a delay of 20 ms, medium security, charging of 0 $ / min, and no priority on the QoS level.

  Furthermore, the serial communication (Serial) characteristic information requires a bandwidth of 64 kbps, a delay of 30 ms, high security, charging of 0 $ / min, and no priority on the QoS level.

  Therefore, since there is only one “Wireless LAN A” network that matches all the conditions, the network database 15 returns this to the network agent 13 as a search result (a6 in FIG. 2).

  When a plurality of matching networks are found, the network characteristics are sorted in the order specified in the profile (billing, QoS parameters in the case of this profile), and the most advantageous one is selected.

  The network agent 13 passes this result to the connection manager 14 and makes a network connection request (a7 in FIG. 2). The connection manager 14 connects to the designated network (a8 in FIG. 2). When the connection to the network is completed, the connection manager 14 returns a connection completion notification to the network agent 13 (a9 in FIG. 2), and the network agent 13 further returns a connection completion notification to the application 11 (a10 in FIG. 2).

  As a result, each application 11 can connect to a network that satisfies a specified condition among the network A 101, the network B 102, and the network C 103 and provide a service to the user.

  The network use end processing is also performed in substantially the same sequence as described above. When the application 11 ends the use of the network, it requests the network agent 13 to end the use of the profile. This corresponds to the above-described processing a3. The network agent 13 excludes this profile and merges the profiles again (a4 in FIG. 2), and thereafter performs the processing after a5 in the same manner as described above.

  As described above, in this embodiment, the network agent 13 automatically selects the network A 101, the network B 102, and the network C 103 in accordance with the connection profile 12, so that the optimum network is automatically selected without bothering the user. Thus, the communication terminal device 1 can connect / disconnect to the network.

  In this embodiment, when the network connection is requested from the application 11, the application 11 can individually deliver the connection profile 12 to the network agent 13 and select a network to be connected on the network agent 13 side. It is possible to automatically select the optimum network according to the request.

  Furthermore, in the present embodiment, the characteristic information of the network A 101, the network B 102, and the network C 103 can be downloaded as necessary using the downloader 16, so even in an environment where a plurality of applications 11 operate simultaneously, Selection can be made automatically.

  In the first embodiment of the present invention described above, connection profiles 12 from a plurality of applications 11 are merged and a network that matches all the profiles is selected. However, in this method, there is no matching network. Cases are considered. Therefore, in the second embodiment of the present invention, even in such a case, some applications can be connected to the network.

  FIG. 7 is a block diagram showing a configuration of a communication terminal apparatus according to the second embodiment of the present invention. 7, the communication terminal device 2 according to the second embodiment of the present invention is the same as the night communication terminal device 1 in the first embodiment of the present invention shown in FIG. 1 except that an application priority table 21 is added. The same components are given the same reference numerals. The operations of the same components are the same as those in the first embodiment of the present invention except that the operations are performed according to the priority order of the application 11 described in the application priority order table 21.

  FIG. 8 is a diagram showing a configuration example of the application priority table 21 of FIG. In FIG. 8, the application priority table 21 includes “voice call: 1”, “mailer: 2”, and “Web browser: 3”.

  In this embodiment, when no network is found when performing profile merging or network search, first, the network agent 13 displays the priority of each application 11 to which the profile has been transferred in the application priority table 21. The application is determined with reference to identify the application having the lowest priority, and the application is notified of the connection failure.

  Next, the network agent 13 removes the profile corresponding to the identified application, performs another profile merging operation, and searches the network based on the merged profile. At this point, if the network agent 13 finds a network, it connects to that network. If the network agent 13 is not found, the network agent 13 repeats the above process again from the specification of the application with the lowest priority.

  In this embodiment, by using the above method, an application having a low priority cannot be connected to the network, but an application having a high priority can be connected to the network, so that the application contention problem is solved. be able to.

  In the first embodiment of the present invention described above, the application 11 itself holds the connection profile 12. However, the connection profile 12 can be separated from the application 11 and held as another database.

  FIG. 9 is a block diagram showing a configuration of a communication terminal apparatus according to the third embodiment of the present invention. In FIG. 9, the communication terminal device 3 according to the third embodiment of the present invention is provided with the connection profile database 31 and the connection profile 12 is separated from the application 11 except for the connection profile database 31 according to the first embodiment of the present invention shown in FIG. The configuration is the same as that of the night communication terminal device 1, and the same components are denoted by the same reference numerals. The operation of the same component is the same as that of the first embodiment of the present invention described above, except that the network is automatically selected based on the connection profile 12 described in the connection profile database 31.

  The connection profile database 31 is a database that maintains the connection profile 12 using the identifier of the application 11 as a key. In this embodiment, the application 11 does not need to have the connection profile 12, and it is only necessary to send the identifier of the application 11 when making a connection / disconnection request to the network agent 13.

  That is, the network agent 13 searches the connection profile database 31 for the corresponding connection profile 12 using the identifier of the application 11 as a key in response to a connection / disconnection request from the application 11.

  The connection profile 12 can be downloaded from the downloader 16 and input to the connection profile database 31 as needed, instead of being stored in the communication terminal device 3 in advance.

  FIG. 10 is a block diagram showing a configuration of a communication terminal apparatus according to the fourth embodiment of the present invention, and FIG. 11 is a diagram showing application priority calculation parameters according to the fourth embodiment of the present invention. 10, the communication terminal device 4 according to the fourth embodiment of the present invention has the same configuration as the communication terminal device 1 according to the first embodiment of the present invention shown in FIG. 1 except that an application manager 41 is added. The same components are given the same reference numerals. The operation of the same component is the same as that of the first embodiment of the present invention except that the operation is performed according to the judgment of the application manager 41 that monitors the operation state of the application 11.

  In this embodiment, when no network is found when performing profile merging or network search, first, the network agent 13 inquires the application manager 41 about the priority of each application 11 to which the profile has been transferred.

  The application manager 41 monitors the operating state of the application 11 and determines its priority. Specifically, the priority is calculated based on the application priority calculation parameter shown in FIG. For example, if the application is running and the UI (User Interface) of the application is displayed, the communication amount within the past one minute is 100 KB, and the operation is in a privileged state, the priority is “4”.

  The network agent 13 identifies the application with the lowest priority and notifies the application of the connection failure. Next, the network agent 13 removes the profile corresponding to the identified application, performs another profile merging operation, and searches the network based on the merged profile. At this point, if the network agent 13 finds a network, it connects to that network. If the network agent 13 is not found, the network agent 13 repeats the above process again from the specification of the application with the lowest priority.

  In this embodiment, the priority can be dynamically calculated by using the above method, and an application with a low priority cannot be connected to the network, but an application with a high priority is connected to the network. Can solve the application contention problem.

  FIG. 12 is a block diagram showing a configuration of a communication terminal apparatus according to the fifth embodiment of the present invention. In FIG. 12, the communication terminal device 5 according to the fifth embodiment of the present invention is the first of the present invention shown in FIG. 1 except that the communication monitoring manager 51 and the connection profile 52 are added and the connection profile 12 is deleted. The configuration is the same as that of the communication terminal device 1 according to the embodiment, and the same components are denoted by the same reference numerals. The operation of the same component is the same as that of the first embodiment of the present invention described above except that it operates according to the judgment of the communication monitoring manager 51 that monitors the operation state of the application 11.

  In this embodiment, the connection profile 52 is prepared not in units of applications 11 but in units of services, specifically, addresses / port numbers of connection destinations from the applications 11.

  The communication monitoring manager 51 monitors the communication state of the application 11 and monitors the address / port number of the communication destination. When the application 11 tries to start communication, the communication monitoring manager 51 selects a matching connection address 52 from the pair of connection profiles 52 and notifies the network agent 13 of this.

  FIG. 13 is a diagram showing an example of the connection profile 52 of FIG. FIG. 13 shows a profile when the address of the communication destination is “server.example.com” and the port number is “80”, and the request conditions are the same as those in FIG.

  FIG. 14 is a diagram showing another example of the connection profile 52 of FIG. FIG. 14 shows a profile when the address of the communication destination is arbitrary and the port number is “5060”, and the request conditions are the same as those in FIG.

  When the application 11 tries to communicate with, for example, “server2.example.com” on port 5060, the communication monitoring manager 51 selects the profile shown in FIG. 14 as the connection profile and notifies the network agent 13 of this profile. . As a result, an optimal network is selected.

  When a plurality of applications 11 try to communicate simultaneously, the communication monitoring manager 51 selects all the profiles that match each other and notifies the network agent 13 of them. The network agent 13 determines the connection network by merging these profiles.

  In the present embodiment, by using the above method, an optimal network can be dynamically selected according to the connection service. Further, there is no need to set a connection profile in advance in the application.

  FIG. 15 is a block diagram showing a configuration of a communication terminal apparatus according to the sixth embodiment of the present invention. 15, the communication terminal device 6 according to the sixth embodiment of the present invention is the same as that shown in FIG. 1 except that the device monitoring manager 61, the connection profile 62, and the sensor 63 are added, and the application 11 and the connection profile 12 are deleted. The same configuration as that of the communication terminal device 1 according to the first embodiment of the present invention shown in FIG. The operation of the same components is the same as that of the first embodiment of the present invention except that the operation is performed according to the judgment of the device monitoring manager 61 that monitors the state of the sensor 63.

  In this embodiment, the connection profile is prepared according to the state of the sensor 63. The sensor 63 may be anything as long as it monitors the state of the apparatus. For example, the remaining battery level, the open / close state of the terminal lid, the presence / absence of button operation by the user, temperature, humidity, acceleration, and the like are conceivable. Further, any software state inside the apparatus may be detected. For example, whether or not a specific application is operating, whether or not a specific value is written in the memory, a free memory capacity, an operating state of the CPU, or the like may be detected. A plurality of these may be combined.

  The device monitoring manager 61 monitors the state of the device by monitoring the state of the sensor 63. When the status of the device is changed, the device monitoring manager 61 selects a connection profile 62 that matches the device status and notifies the network agent 13 of this.

  16 and 17 are diagrams illustrating an example of the connection profile 62 in FIG. In the examples shown in FIGS. 16 and 17, the profile shown in FIG. 16 or FIG. 17 is selected according to the remaining battery level of the apparatus.

  When the remaining battery level is 30% or more, the profile shown in FIG. 16 is selected, and a network as fast as possible (10 Mbps or more) is selected. On the other hand, when the remaining battery level is 30% or less, the profile shown in FIG. 17 is selected, and a connection is made even with a relatively low speed network (128 kbps or higher).

  In this embodiment, by using the above method, an optimal network can be dynamically selected according to the apparatus state. Further, there is no need to set a connection profile in advance in the application.

It is a block diagram which shows the structure of the communication terminal device by 1st Example of this invention. It is a sequence chart which shows the internal operation | movement of the communication terminal device of FIG. It is a figure which shows the connection profile of FIG. It is a figure which shows the connection profile of FIG. FIG. 5 is a diagram showing an example in which connection profiles 12 shown in FIGS. 3 and 4 are merged. It is a figure which shows the network characteristic information by 1st Example of this invention. It is a block diagram which shows the structure of the communication terminal device by the 2nd Example of this invention. It is a figure which shows the structural example of the application priority table of FIG. It is a block diagram which shows the structure of the communication terminal device by the 3rd Example of this invention. It is a block diagram which shows the structure of the communication terminal device by the 4th Example of this invention. It is a figure which shows the application priority calculation parameter by 4th Example of this invention. It is a block diagram which shows the structure of the communication terminal device by the 3rd Example of this invention. It is a figure which shows an example of the connection profile of FIG. It is a figure which shows the other example of the connection profile of FIG. It is a block diagram which shows the structure of the communication terminal device by the 3rd Example of this invention. It is a figure which shows an example of the connection profile of FIG. It is a figure which shows an example of the connection profile of FIG.

Explanation of symbols

1 to 6 Communication terminal device 11 Application software 12 Connection profile 13 Network agent 14 Connection manager 15 Network database 16 Downloader 17 Recording medium 21 Application priority table 31 Connection profile database 41 Application manager 51 Communication monitoring manager 52 Connection profile 61 Device monitoring manager 62 Connection profile 63 Sensor 101 Network A
102 Network B
103 Network C

Claims (14)

  1. A communication terminal device capable of operating a plurality of application software and connected to a plurality of types of networks,
    Having a selection means for selecting an optimal network according to the context in its own device;
    The selection means receives a connection profile describing the selection criteria of the network in the application software from the application software, selects the optimal network based on the connection profile,
    Including a communication monitoring manager for monitoring a communication state of the application;
    The communication terminal apparatus, wherein the selection unit calculates a priority of the application software from a communication state of the application software by the communication monitoring manager, and selects an optimum network based on the priority .
  2. Including a network database storing characteristic information of each of the networks;
    2. The communication according to claim 1, wherein the selection unit selects the optimum network by matching the connection profile with characteristic information stored in the network database when the network is selected. Terminal device.
  3.   3. The communication terminal apparatus according to claim 2, further comprising a downloader that downloads the characteristic information of the network and stores it in the network database.
  4. A communication terminal device capable of simultaneously operating a plurality of application software and connecting to a plurality of types of networks,
    Having a selection means for selecting an optimal network according to the context in its own device;
    The selection means receives a connection profile describing the selection criteria of the network in the application software from the application software, and merges the plurality of connection profiles to select the optimal network,
    Including an application manager for monitoring the status of the application;
    Calculate the priority of the application software from the state of the application software in the application manager,
    The communication terminal apparatus, wherein the selection means selects an optimal network based on the priority.
  5. Including a network database storing characteristic information of each of the networks;
    4. The selection unit, when selecting the network, selects the optimum network by matching the merged connection profile with characteristic information stored in the network database. Communication terminal device.
  6.   5. The communication terminal apparatus according to claim 4, further comprising a downloader that downloads the characteristic information of the network and stores it in the network database.
  7. A network selection method used for a communication terminal device capable of operating a plurality of application software and connected to a plurality of types of networks,
    The communication terminal device side has a step of selecting an optimal network according to the context in the communication terminal device,
    In the step of selecting the optimum network, a connection profile describing the selection criteria of the network in the application software is received from the application software, and the optimum network is selected based on the connection profile;
    A network selection method comprising: monitoring a communication state of the application software; calculating a priority of the application software from the state; and selecting an optimum network according to the priority .
  8.   The step of selecting the optimum network includes matching the connection profile with characteristic information stored in a network database that stores characteristic information of each network when the network is selected. The network selection method according to claim 7, wherein the selection is performed.
  9.   9. The network selection method according to claim 8, wherein the network characteristic information is downloaded by a downloader and stored in the network database.
  10. A network selection method for use in a communication terminal device capable of simultaneously operating a plurality of application software and connecting to a plurality of types of networks,
    The communication terminal device side has a step of selecting an optimal network according to the context in the communication terminal device,
    In the step of selecting the optimum network, a connection profile describing a selection criterion of the network in the application software is received from the application software, and the plurality of connection profiles are merged to select the optimum network,
    A network selection method comprising: monitoring a state of the application software; calculating a priority of the application software from the state; and selecting an optimum network according to the priority.
  11.   The step of selecting the optimal network is performed by matching the merged connection profile with characteristic information stored in a network database storing characteristic information of each network when selecting the network. The network selection method according to claim 10, wherein a network is selected.
  12.   12. The network selection method according to claim 11, wherein the network characteristic information is downloaded by a downloader and stored in the network database.
  13. A program that allows a computer in a communication terminal device that can operate a plurality of application software and connect to a plurality of types of networks to be executed,
    Including a process of selecting an optimal network according to a context in the communication terminal device,
    In the step of selecting the optimum network, a connection profile describing the selection criteria of the network in the application software is received from the application software, and the optimum network is selected based on the connection profile;
    A program that monitors a communication state of the application software, calculates a priority of the application software from the state, and selects an optimum network according to the priority .
  14. A program that allows a plurality of application softwares to operate simultaneously and to be executed by a computer in a communication terminal device that can be connected to a plurality of types of networks,
    Including a process of selecting an optimal network according to a context in the communication terminal device,
    In the step of selecting the optimum network, a connection profile describing the selection criteria of the network in the application software is received from the application software, and the plurality of connection profiles are merged to select the optimum network.
    A program for monitoring a state of the application software, calculating a priority of the application software from the state, and selecting an optimum network according to the priority.
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