JP2016063296A - Communication path switching device, system, method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To distribute a network load by identifying a communication content and dynamically performing switching to a communication path suitable for the communication content.SOLUTION: A communication path switching device includes at least first and second interfaces, a third interface, and a control unit. The first and second interfaces connect with first and second communication paths connected to an information processing device through the Internet, respectively; the third interface connects with a terminal device. In response to a request received from the terminal device through the third interface, the control unit receives response information from the information processing device from the first communication path through the first interface, determines a type of the response information and performs switching between the first interface and the second interface on the basis of a result of the determination.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a technique for switching communication paths according to communication contents and distributing communication loads.

  Recently, network communication load balancing has become an important concept. For example, in a smartphone or the like, as a communication means on a main WAN (Wide Area Network) side, a mobile communication business such as a 3G (Third Generation, third generation mobile communication system) line or an LTE (Long Term Evolution) line. You are using a network managed by an administrator. Then, as an alternative means of communication by these, wireless LAN (Local Area Network) communication is used to distribute and reduce the communication load on the network.

  In addition to HGW (Home Gateway), which is mainly used indoors, such as in homes, etc., equipped with high-speed communication functions using optical fibers, 3G lines and LTE lines, which are carried around and used mainly outdoors. Mobile routers that connect to the Internet using the Internet are spreading. Further, in the future, there is a possibility that a communication device that handles an indoor HGW and an outdoor mobile router by a single unit will become widespread. In such a communication apparatus, it is considered that at least two types of communication paths are provided as communication paths to the WAN side, and the communication load can be distributed.

JP 2014-057253 A

  However, at present, when a plurality of communication paths are provided and communication is distributed, which communication path is to be used is determined in advance. Therefore, it has not been performed to dynamically switch the communication path by determining what kind of communication packet is flowing.

  Patent Document 1 discloses a communication device that performs session control using SIP (Session Initiation Protocol). When determining a routing destination from a plurality of route candidates for a newly generated SIP management session, the communication device of Patent Literature 1 selects a route with a smaller number of non-SIP management sessions as a new SIP management session. Determine as the routing destination. As a result, a decrease in communication quality of the SIP management session is suppressed. However, in Patent Document 1, it is not determined what kind of communication packet is flowing in the SIP management session, and the session is not dynamically switched according to this.

  The present invention has been made in view of the above problems, and an object of the present invention is to distribute network load by identifying communication contents and dynamically switching to a communication path suitable for the communication contents. .

  A communication path switching apparatus according to the present invention includes at least a first interface, a second interface, a third interface, and a control unit, and the first and second interfaces are respectively connected via the Internet. The first and second communication paths connected to the information processing apparatus are connected, the third interface is connected to a terminal apparatus, and the control unit responds to a request received from the terminal apparatus via the third interface. On the other hand, response information from the information processing apparatus is received from the first communication path via the first interface, the type of the response information is determined, and the first interface is determined based on the determination result. Switch to the second interface.

  A communication path switching system according to the present invention includes a communication path switching apparatus, a terminal device connected to the communication path switching apparatus, first and second communication paths connected to the communication path switching apparatus, the first and first The communication path switching apparatus includes at least a first interface, a second interface, a third interface, and a control unit. And the second interface are connected to the first and second communication paths, respectively, the third interface is connected to the terminal device, and the control unit is connected to the terminal via the third interface. In response to a request received from a device, the response information from the information processing device is received from the first communication path via the first interface, the type of the response information is determined, and the determination result is Zui by switching between the second interface and the first interface.

  The communication path switching method according to the present invention receives response information for the request from the first communication path via the first interface in response to the request transmitted from the terminal device to the information processing apparatus on the Internet. The type of the response information is determined, and based on the determination, switching from communication to the first communication path via the first interface to switching to the second communication path via the second interface is performed. Do.

  A communication path switching program according to the present invention is a process for receiving response information for a request from a first communication path via a first interface in response to a request transmitted from a terminal apparatus to an information processing apparatus on the Internet. And a process for determining the type of the response information, and a second communication path via the second interface from communication to the first communication path via the first interface based on the determination. The process of switching to is executed.

  According to the present invention, it is possible to distribute a network load by identifying communication contents and dynamically switching to a communication path suitable for the communication contents.

It is a block diagram which shows the structure of the communication path switching apparatus of embodiment of this invention. It is a block diagram which shows the structure of the communication path switching apparatus of embodiment of this invention. It is a figure which shows the example of the application of a terminal device. It is a figure which shows the content information which the content content determination part of the communication path switching apparatus of embodiment of this invention receives. It is a figure which shows the port number list which the content content determination part of the communication path switching apparatus of embodiment of this invention has. It is a figure which shows the protocol number list | wrist which the content content determination part of the communication path switching apparatus of embodiment of this invention has. It is a figure which shows the Content-Type number list which the content content determination part of the communication path switching apparatus of embodiment of this invention has. It is a figure which shows the example of determination of the kind of content of the communication path switching apparatus of embodiment of this invention. It is a figure which shows the case where the communication path switching device of embodiment of this invention is applied to the communication which performs session control using SIP. It is a flowchart which shows operation | movement of the communication path switching apparatus of embodiment of this invention. It is a figure which shows the sequence (no switching of a communication path) to which the communication path switching apparatus of embodiment of this invention is applied. It is a figure which shows the sequence (with communication path switching) which applied the communication path switching apparatus of embodiment of this invention. It is a figure which shows the example of application of the communication path switching apparatus of embodiment of this invention. It is a figure which shows the example of application of the communication path switching apparatus of embodiment of this invention. It is a figure which shows the application example of related HGW.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the preferred embodiments described below are technically preferable for carrying out the present invention, but the scope of the invention is not limited to the following.
(Description of configuration)
FIG. 1 is a block diagram showing a configuration of a communication path switching apparatus according to an embodiment of the present invention. The communication path switching device 1 of this embodiment includes at least a first interface 2, a second interface 3, a third interface 4, and a control unit 5. The first and second interfaces 2 and 3 are respectively connected to first and second communication paths that communicate with the information processing apparatus via the Internet. The third interface 4 is connected to a terminal device. In response to a request received from the terminal device via the third interface 4, the control unit 5 sends response information from the information processing device via the first communication path via the first interface 2. receive. Further, the type of the response information is determined, and the first interface 2 and the second interface 3 are switched based on the determination result.

  FIG. 2 is a block diagram showing a specific configuration of the communication path switching apparatus of the present embodiment. The communication path switching device 10 includes at least a first WAN interface 20, a second WAN interface 30, and a LAN interface 40. The first WAN interface 20 is connected to a first communication path (WAN) and communicates with the information processing apparatus via the Internet (see FIG. 1). The second WAN interface 30 is connected to a second communication path (WAN) and communicates with the information processing apparatus via the Internet (see FIG. 1). The LAN interface 40 is connected to the terminal device and communicates with the terminal device (see FIG. 1).

  As shown in FIG. 3, the terminal device connected in the LAN displays a moving image application for performing moving image communication, a calling application for performing call communication, a browser for browsing a home page, and an image. It is assumed that software such as an image application is installed.

  The communication path switching device 10 includes a control unit 50 that controls communication. In response to a request received from the terminal device via the LAN interface 40, the control unit 50 receives response information from the information processing device such as a server from the first communication path via the first WAN interface 20. Furthermore, the control unit 50 determines the type of content that is the response information, and switches between the first WAN interface 20 and the second WAN interface 30 based on the determination result.

  For this purpose, the control unit 50 includes an information extraction unit 51, a content determination unit 52, a switching execution unit 53, and a communication re-execution unit 54.

  In response to the request received from the terminal device, the information extraction unit 51 includes the next response information received from the information processing device via the first communication interface via the first communication interface 20. Extract information. That is, from the content, “IP (Internet Protocol) address from WAN side (server etc.)”, “Port number from WAN side (server etc.)”, “Protocol number from WAN side (server etc.)”, “ Extraction of “Content-Type” information from the WAN side (server or the like). Further, the extracted information is sent to the content determination unit 52.

  The information extraction unit 51 also passes through the request information received from the terminal device via the LAN interface 40 without doing anything.

  Further, the communication path switching apparatus 10 can arbitrarily determine a communication path for transmitting a request received from the terminal apparatus to the information processing apparatus at an initial time point. In this description, it is assumed that the first WAN interface 20 passes through the first communication path.

  Upon receiving the information extracted by the information extraction unit 51, the content determination unit 52 determines the content type of the content. That is, the content determination unit 52 first receives the information shown in FIG. The content determination unit 52 may store the information of FIG.

  According to the IP address from the server on the WAN side, the type of content can be determined as follows. That is, for example, it is assumed that a terminal device connected to the LAN side starts an application and starts communication for viewing a moving image. When the IP address of the video viewing server is uniquely determined each time, or when the relationship between the IP address and the video site is clear, the content determination unit 52 is requested from the IP address and the IP address in advance. Register that the content is a video. Thus, the content determination unit 52 can determine that the communication content is a moving image when the IP address is confirmed. On the other hand, in the case of an IP address not registered in advance as described above, the content determination unit 52 does not use the IP address for determination of the type of content.

  According to the port number from the server on the WAN side, the type of content can be determined as follows. In IP communication, port numbers from 0 to 65535 can be used regardless of TCP (Transmission Control Protocol) or UDP (User Datagram Protocol). In particular, port numbers from 0 to 1023 are called well-known port numbers (well-known port numbers), which are mainly used on the server side. It is specified.

  In addition to the well non-port numbers, the registered port numbers are numbers from 1024 to 49151. In these numbers, the port numbers to be used are specified by the application protocol to be used. Examples of the port numbers are as shown in the port number list 521 in FIG. For example, if 443 is used as the port number, it can be estimated that communication such as browsing by HTTPS (Hypertext Transfer Protocol Secure) is being performed in the terminal device on the LAN side. Therefore, the content determination unit 52 can determine the type of content by having the port number list 521 and associating the port number from the server on the WAN side with the port number list 521.

  According to the protocol number from the server on the WAN side, the type of content can be determined as follows. The protocol number is a number for identifying a protocol in an upper layer used in IP communication. The protocol number is defined in the IP header part. Examples of protocol numbers are shown in the protocol number list 522 in FIG. For example, if the protocol number is 17, it can be identified as UDP. Therefore, the content determination unit 52 can determine the type of content by having the protocol number list 522 so that the protocol number from the server on the WAN side corresponds to the protocol number list 522.

  According to Content-Type from the WAN server, the type of content can be determined as follows. The Content-Type is a response from the ent in the communication header such as SIP, HTTP (Hyper Text Transfer Protocol), MIME (Multipurpose Internet Mail Extension) and RTSP (Real Time Streaming Protocol). Field) is a character string indicating the type of application defined in the section.

  An example of the Content-Type is shown in the Content-Type list 523 in FIG. Content-Type is largely classified into types such as “text”, “message”, “application”, “image”, “audio”, and “video”. Sub Type is defined to further identify the content for each Type. For example, “html”, “xml”, etc. in “text”, “http”, “s-http”, etc. in “message”, “pdf”, “zip”, “image” in “application” In “jpeg”, “gif”, “tiff”, “audio”, “mpeg”, “MP4A-LATM”, in “video”, “mpeg”, “quicktime”, “MP4V-ES”, and the like. For example, when Content-Type is designated as “video / MP4V-ES” during a response from the server, it can be estimated that the communication content is a moving image packet.

  Therefore, the content determination unit 52 can determine the type of content by having the Content-Type list 523 and corresponding the Content-Type from the server on the WAN side to the Content-Type list 523.

  As described above, the communication path switching device 10 confirms the IP address, the port number, the protocol number, and the Content-Type included in the communication response from the WAN-side server at the content determination unit 52, and The type of communication content is determined from the combination.

  An example of content type determination is shown in FIG. The content information 524 in FIG. 8 is an example of information extracted by the information extraction unit 51 and received by the content determination unit 52. In the content information 524, the IP address is not particularly specified and is a range that is not subject to determination by the content determination unit 52. The port number is 8080 (http-alt), the protocol number is 6 (TCP), and the Content-Type is video / mp4. Based on these pieces of information, it is determined that the content being communicated is video data provided from a service on the Web (World Wide Web).

  In the case of the example in FIG. 8, it is possible to determine that the content being communicated is moving image data only with the content-type information. However, as described above, the communication protocol having Content-Type is limited. Therefore, in order to enable determination even in the case of a communication protocol in which Content-Type is omitted, in addition to Content-Type, an IP address, a port number, and a protocol number are confirmed.

  In the content information 524 of FIG. 8, it is determined that the moving image is from the Web service in the combination of the port number 8080 (http-alt), the protocol number 6 (TCP), and the Content-Type video / mp4. The criteria for determination at this time can be arbitrarily specified by the environment in which the information path switching device 10 is used, the end user, or the like.

  The content determination unit 52 determines whether or not the communication path should be switched from the first WAN interface 20 to the second WAN interface 30 based on the content type determination result obtained as described above. Judgment. That is, the content determination unit 52 includes characteristics such as the communication capacity and communication quality of the communication path connected to the first WAN interface 20 and the second WAN interface 30, and the type of content suitable for the characteristics of the communication path. Is previously registered.

  For example, from the determination result of the content determination unit 52, each content includes “text / message”, “image”, “call (voice)”, and “video” classified and defined by the content determination unit 52. Classification is applied. On the other hand, in the content determination unit 52, for example, assuming that the communication path of the first WAN interface 20 is for high-speed communication, it is registered that the content determined as “moving image” with a large communication load is communicated. Has been. Also, assuming that the communication path connected to the second WAN interface 30 is for low-speed communication, it is registered to communicate content determined as “text / message” or “image” with a relatively low communication load. ing. Furthermore, the communication path of the third WAN interface (not shown) is registered to communicate content determined as “call (voice)”, assuming that communication quality can be ensured.

  When the content classification obtained from the communication path of the first WAN interface 20 is different from the classification registered to communicate through the communication path, the content determination unit 52 instructs the switching execution unit 53 to store the content. Instruct to switch to the WAN interface of the appropriate communication path.

  In addition, when the switching is not necessary, the content determination unit 52 performs a process of transferring the content to the LAN interface 40 without issuing a switching instruction to the switching execution unit 53 in order to maintain the current connection. That is, the information extraction unit 51 can hold the content for information extraction. The content determination unit 52 instructs the information extraction unit 51 to release this holding and transfer it to the LAN interface 40.

  Upon receiving an instruction to switch the WAN interface, the switching execution unit 53 switches from the current interface, for example, the first WAN interface 20 to the interface instructed for connection, for example, the second WAN interface 30 based on the instruction. . At this time, it is desirable to switch at the layer 1 and layer 2 levels in the IP, but when the communication path is switched, the IP address of the communication path switching device 10 may change. In that case, after disconnecting the communication once and switching the communication path by switching the WAN interface, the request received from the terminal device stored in the communication re-execution unit 54 is sent to the information processing apparatus for a new communication. Communication may be started again on the route.

  Note that the switching execution unit 53 also passes the request information received from the terminal device via the LAN interface 40 to the WAN interface side without doing anything.

  As described above, the communication re-execution unit 54 stores the request received from the terminal device via the LAN interface 40 and prepares for the start of another communication.

  As described above, the information path switching apparatus 10 classifies communication contents into “text / message”, “image”, “call (voice)”, “moving image”, and the like. By associating these with high / low communication load or high / low communication quality priority (QoS, Quality of Service), the communication capacity and communication quality can be dynamically optimized. It is possible to communicate by switching to

  The function of the control unit 50 of the information path switching apparatus 10 can be realized by using a CPU (Central Processing Unit) having an information processing function and a memory having an information storage function and operating a program by the CPU.

FIG. 9 shows a configuration in which the communication path switching device 10 is used for communication that performs session control using SIP. The communication path switching device 10 determines the type of content, which is response information from the information processing device, for a SIP management session newly generated at the request of the terminal device. Further, for example, the dynamic switching is performed such that “video” having a large communication load passes through the first session, and “text / message” having a low communication load passes through the second session.
(Description of operation)
The operation of the information path switching apparatus 10 of this embodiment will be described below. FIG. 10 is a flowchart showing the operation of the communication path switching device 10.

  First, the communication path switching device 10 receives a communication request for viewing a moving image from a terminal device connected to the LAN to a server, which is an information processing device on the Web, via the LAN interface 40 (S01). Next, the communication path switching device 10 transmits the communication request from the first WAN interface 20 to the server on the WAN side (S02). Next, the communication path switching apparatus 10 receives a content packet as response information from the server in response to the communication request at the first WAN interface 20 (S03).

  Next, the communication path switching device 10 extracts each information of “IP address”, “port number”, “protocol number”, and “Content-Type” from the packet by the information extraction unit 51 (S04). . Next, in the communication path switching device 10, the content determination unit 52 determines the type of content such as “text / message”, “image”, “call (voice)”, “video” from the extracted information. (S05). Next, the communication path switching device 10 determines whether the current communication path on the WAN side is a communication path suitable for the type of content in the content determination unit 52 based on the communication capacity and communication quality of the communication path. It is determined and it is determined whether or not to switch the communication path (S06).

  When S06 is NO, the content determination unit 52 transmits the packet from the LAN interface 40 to the terminal device without instructing the switching execution unit 53 to switch the interface (S07). On the other hand, when S06 is YES, the content determination unit 52 instructs the switching execution unit 53 to switch the interface (S08). At this time, when switching at the IP layer 3 or higher level, the communication of the WAN interface is once disconnected, and after switching the communication path by switching the WAN interface, the data is stored in the communication re-execution unit 54. The communication request received from the received terminal device is retransmitted to the server.

  The above is the operation of the communication path switching device 10.

  Next, a sequence when the communication path switching device 10 is used for communication for performing session control using SIP shown in FIG. 9 will be described. FIG. 11 is a diagram illustrating a sequence when session switching is not performed. FIG. 12 is a diagram illustrating a sequence in a case where session switching is performed.

  In FIG. 11, the terminal device activates an application such as video viewing and transmits a communication request to a server on the Internet (S11). The communication path switching device 10 transmits the request to the server via the first session (S12). The server transmits a content packet as a response to the request to the terminal device (S13).

  Upon receiving the response, the communication path switching device 10 extracts information on the IP address, port number, protocol number, and Content-Type in the packet (S14). The communication path switching device 10 identifies the type of the content based on the extracted information, and determines whether the content is communicated in a session suitable for the content. In FIG. 11, since communication is performed in a suitable session, it is determined not to switch the session (S15).

  The communication path switching device 10 transmits the response to the terminal device (S16).

  In the sequence for switching sessions in FIG. 12, the operations in S21 to S24 are the same as the operations in S11 to S14 in FIG. The communication path switching device 10 identifies the type of the content based on the extracted information, and determines whether the content is communicated in a session suitable for the content. In FIG. 12, since communication is not performed in a suitable session, it is determined to switch to a suitable session (S25).

  The communication path switching device 10 once disconnects communication in the current session (S26). However, if the session can be switched within the range of influence at the layer 1 and layer 2 levels, it is not necessary to disconnect the communication. Thereafter, the communication path switching device 10 switches from the first session to the second session (S27).

  Next, the communication path switching device 10 retransmits the communication request from the terminal device to the server again through the second session (S28). The server transmits a content packet as a response to the request to the terminal device (S29). However, if it is possible to switch sessions without the need to disconnect the communication in S26, S28 and S29 can be omitted.

  The communication path switching device 10 transmits the response to the terminal device (S30).

  When the content determination unit 52 of the communication path switching device 10 determines the type of content, not only the IP address, port number, protocol number, and content-type information from the WAN side server, but also the time required for communication is determined. It can also be a determination element. That is, by monitoring the communication time, when the communication time of the content exceeds a certain period and reaches a long time, the content determination unit 52 determines that the content being communicated is a type that places a load on the communication path, You may perform the operation | movement which switches the session suitable for the said content.

  FIG. 13 is a diagram illustrating an application example of the communication path switching device 10 of the present embodiment.

  As shown in FIG. 15, the existing HGW has an IP communication method for WAN side communication. Further, in the LAN side communication, it is possible to belong to / connect to a terminal device capable of IP communication such as a personal computer or a smartphone by wired communication using an Ethernet (registered trademark) cable or wireless communication based on a wireless communication standard.

  On the other hand, the communication path switching device 10 of FIG. 13 is a communication system using IP, and has at least two or more communication paths in WAN side communication. For example, one communication path can perform high-speed wired communication using an optical fiber, and the other can perform high-speed wireless communication such as 3G or LTE. In the LAN side communication, it is possible to belong to / connect to a terminal device capable of IP communication such as a personal computer or a smartphone by a communication method such as a wired LAN and a wireless LAN.

  FIG. 14 is a diagram illustrating another example to which the communication path switching device according to the present embodiment is applied. The function of this communication path switching device can be incorporated in a terminal device connected via LAN. That is, the terminal device in FIG. 14 has, as connection sessions, for example, a session such as a 3G line connected to the Internet as the first wireless communication and a wireless LAN connection connected to the HGW connected to the Internet as the second wireless communication. And having a session. Thereby, the function of the control unit 50 of the communication path switching device 10 shown in FIG. 2 can be incorporated into the terminal device. As a result, in the terminal device on the LAN side such as a smartphone or a personal computer, it is possible to determine the type of content from the information processing device and dynamically switch the session.

  As described above, according to the present embodiment, it is possible to distribute the network load by identifying communication contents and dynamically switching to a communication path suitable for the communication contents.

  The present invention is not limited to the above embodiment, and various modifications are possible within the scope of the invention described in the claims, and these are also included in the scope of the present invention.

  Moreover, although a part or all of said embodiment may be described also as the following additional remarks, it is not restricted to the following.

Appendix (Appendix 1)
At least a first interface, a second interface, a third interface, and a control unit, wherein the first and second interfaces are respectively connected to an information processing apparatus via the Internet; The second interface is connected to the second communication path, the third interface is connected to the terminal device, and the control unit uses the first interface in response to a request received from the terminal device via the third interface. Receiving response information from the information processing apparatus via the first communication path, determining a type of the response information, and switching between the first interface and the second interface based on the determination result; Communication path switching device.
(Appendix 2)
The communication path switching device according to appendix 1, wherein the control unit includes an information extraction unit that extracts information for determining a type of the response information from the response information.
(Appendix 3)
The communication path switching apparatus according to appendix 2, wherein the information to be extracted includes an IP address, a port number, a protocol number, and a Content-Type.
(Appendix 4)
The control unit includes a content determination unit that determines a type of the response information from the extracted information and instructs switching between the first interface and the second interface based on a result of the determination. 2. The communication path switching device according to 2 or 3.
(Appendix 5)
The communication path switching device according to appendix 4, wherein the control unit includes a switching execution unit that switches between the first interface and the second interface based on the switching instruction.
(Appendix 6)
The communication path switching device according to appendix 5, wherein the content determination unit instructs the switching execution unit to perform the switching based on the determination.
(Appendix 7)
7. The communication path switching device according to claim 1, wherein the content determination unit determines the switching by associating characteristics of the communication path with a type of the response information.
(Appendix 8)
The communication path switching device according to appendix 7, wherein the characteristics of the communication path include communication capacity and communication quality.
(Appendix 9)
The communication path switching according to any one of appendices 1 to 8, wherein the control unit includes a communication re-execution unit that, when the switching is performed, retransmits a request received from the terminal device via the second interface. apparatus.
(Appendix 10)
The communication path switching device according to appendix 9, wherein the communication re-execution unit stores a request received from the terminal device.
(Appendix 11)
A communication path switching apparatus; a terminal apparatus connected to the communication path switching apparatus; first and second communication paths connected to the communication path switching apparatus; and information processing connected to the first and second communication paths. The communication path switching device has at least a first interface, a second interface, a third interface, and a control unit, and the first and second interfaces are respectively The first and second communication paths are connected, the third interface is connected to the terminal device, and the control unit responds to a request received from the terminal device via the third interface. The response information from the information processing apparatus is received from the first communication path via the first interface, the type of the response information is determined, and the first interface and the previous interface are determined based on the determination result. Switching a second interface, a communication path switching system.
(Appendix 12)
The communication path switching system according to appendix 11, wherein the control unit includes an information extraction unit that extracts information for determining the type of the response information from the response information.
(Appendix 13)
The communication path switching system according to appendix 12, wherein the information to be extracted includes an IP address, a port number, a protocol number, and a Content-Type.
(Appendix 14)
The control unit includes a content determination unit that determines a type of the response information from the extracted information and instructs switching between the first interface and the second interface based on a result of the determination. The communication path switching system according to 12 or 13.
(Appendix 15)
The communication path switching system according to appendix 14, wherein the control unit includes a switching execution unit that switches between the first interface and the second interface based on the switching instruction.
(Appendix 16)
The communication path switching system according to supplementary note 15, wherein the content determination unit instructs the switching execution unit to perform the switching based on the determination.
(Appendix 17)
The communication path switching system according to any one of appendices 11 to 16, wherein the content determination unit determines the switching by associating characteristics of the communication path with a type of the response information.
(Appendix 18)
The communication path switching system according to appendix 17, wherein the characteristics of the communication path include communication capacity and communication quality.
(Appendix 19)
The communication path switching according to any one of appendices 11 to 18, wherein the control unit includes a communication re-execution unit that, when the switching is performed, retransmits a request received from the terminal device via the second interface. system.
(Appendix 20)
The communication path switching system according to appendix 19, wherein the communication re-execution unit stores a request received from the terminal device.
(Appendix 21)
In response to a request transmitted from the terminal device to the information processing apparatus on the Internet, response information for the request is received from the first communication path via the first interface, and the type of the response information is determined. A path switching method for switching from communication to the first communication path via the first interface to switching to a second communication path via the second interface based on the determination.
(Appendix 22)
The route switching method according to appendix 21, wherein information for determining the type of the response information is extracted from the response information.
(Appendix 23)
23. The path switching method according to appendix 22, wherein the information for determination includes an IP address, a port number, a protocol number, and a Content-Type.
(Appendix 24)
24. The route switching method according to one of appendices 21 to 23, wherein the switching is determined in association with a characteristic of the communication route and a type of the response information.
(Appendix 25)
25. The path switching method according to appendix 24, wherein the characteristics of the communication path include communication capacity and communication quality.
(Appendix 26)
26. One of the appendices 21 to 25, wherein after the switching is performed, the request from the terminal device is retransmitted to the information processing device via the second communication path via the second interface. Route switching method.
(Appendix 27)
In response to a request transmitted from the terminal device to the information processing apparatus on the Internet, processing for receiving response information for the request from the first communication path via the first interface, and determining the type of the response information And a process of switching from communication to the first communication path via the first interface to switching to the second communication path via the second interface based on the determination. Route switching program to be executed.
(Appendix 28)
28. The route switching program according to appendix 27, wherein a process for extracting information for determining the type of the response information from the response information is executed.
(Appendix 29)
29. The route switching program according to appendix 28, wherein the information for determination includes an IP address, a port number, a protocol number, and a Content-Type.
(Appendix 30)
30. The route switching program according to one of appendices 27 to 29, wherein a process for determining the switching is executed by associating the characteristics of the communication route with the type of response information.
(Appendix 31)
The route switching program according to attachment 30, wherein the characteristics of the communication route include communication capacity and communication quality.
(Appendix 32)
After the switching is performed, a process of retransmitting the request of the terminal device to the information processing device via the second communication path via the second interface is executed. 1. A route switching program according to item 1.

DESCRIPTION OF SYMBOLS 1 Communication path switching apparatus 2 1st interface 3 2nd interface 4 3rd interface 5 Control part 10 Communication path switching apparatus 20 1st WAN interface 30 2nd WAN interface 40 LAN Interface 50 Control Unit 51 Information Extraction Unit 52 Content Determination Unit 53 Switching Execution Unit 54 Communication Re-execution Unit 521 Port Number List 522 Protocol Number List 523 Content-Type List 524 Content Information

Claims (10)

At least a first interface, a second interface, a third interface, and a control unit;
The first and second interfaces are respectively connected to first and second communication paths connected to the information processing apparatus via the Internet,
The third interface connects to a terminal device;
The control unit receives response information from the information processing apparatus from the first communication path via the first interface in response to a request received from the terminal apparatus via the third interface; A communication path switching device that determines a type of response information and switches between the first interface and the second interface based on the determination result. The communication path switching apparatus according to claim 1, wherein the control unit includes an information extraction unit that extracts information for determining a type of the response information from the response information. The communication path switching device according to claim 2, wherein the information to be extracted includes an IP address, a port number, a protocol number, and a Content-Type. The control unit includes a content determination unit that determines a type of the response information from the extracted information and instructs switching between the first interface and the second interface based on a result of the determination. Item 4. The communication path switching device according to Item 2 or 3. The communication path switching device according to claim 4, wherein the control unit includes a switching execution unit that switches between the first interface and the second interface based on the switching instruction. 6. The communication path switching device according to claim 1, wherein the content determination unit determines the switching by associating characteristics of the communication path with a type of the response information. 7. The communication path according to claim 1, wherein the control unit includes a communication re-execution unit that, when the switching is performed, retransmits a request received from the terminal device via the second interface. Switching device. A communication path switching apparatus; a terminal apparatus connected to the communication path switching apparatus; first and second communication paths connected to the communication path switching apparatus; and information processing connected to the first and second communication paths. Having a device,
The communication path switching device includes at least a first interface, a second interface, a third interface, and a control unit,
The first and second interfaces are connected to the first and second communication paths, respectively, the third interface is connected to the terminal device,
The control unit receives response information from the information processing apparatus from the first communication path via the first interface in response to a request received from the terminal apparatus via the third interface; A communication path switching system that determines a type of response information and switches between the first interface and the second interface based on the determination result. In response to a request transmitted from the terminal device to the information processing apparatus on the Internet, response information for the request is received from the first communication path via the first interface;
Determining the type of response information;
A path switching method for switching from communication to the first communication path via the first interface to switching to a second communication path via the second interface based on the determination. In response to a request transmitted from the terminal device to the information processing apparatus on the Internet, processing for receiving response information for the request from the first communication path via the first interface;
A process for determining the type of the response information;
Based on the determination, a path switching that executes a process of switching from the communication to the first communication path via the first interface to the second communication path via the second interface. program.

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