JP6848706B2 - Protocol converters, computer programs, and wireless communication devices - Google Patents

Description

The present invention relates to a protocol converter, a computer program, and a wireless communication device.

In a router connected to a wide area radio access network, the received power from the wide area radio access network may decrease due to changes in the surrounding environment, and the connection may be cut off. Therefore, there is a problem that the connection between the terminal connected to the router and the access destination is cut off.

RFC 6824, TCP Extensions for Multipath Operation with Multiple Addresses, [online], [Search May 1, 2017], Internet <URL: https://tools.ietf.org/html/rfc6824>

Here, multipath TCP has been proposed as a method for improving session stability by forming a plurality of communication paths (see Non-Patent Document 1). Multipath TCP is a protocol that bundles sessions at the transport layer. By introducing a protocol such as multipath TCP, an application can form multiple paths in the transport layer without worrying about multiple paths.

It is conceivable to deal with the above-mentioned problems by introducing a protocol such as multipath TCP. That is, by adding a network interface for accessing a plurality of wide area radio access networks to the router and introducing a protocol such as multipath TCP, it is possible to make the route redundant and stabilize the communication.

However, if all communication is carried out as multi-path communication, the bandwidth utilization efficiency may drop. For example, when a certain route during communication is cut off, retransmission processing occurs on another route, but if there is not enough bandwidth on the other route, even a high-priority session connection may be disconnected. is there.

Further, in general, mobile operators often install a cache server in each operator network in order to reduce the network load. Since the cache server of the operator network is often inaccessible from another operator network, in multi-route communication using a plurality of operators, access failure to the cache server occurs for each access to the cache server. Therefore, inquiries to the original access destination server are frequently made. As a result, there is a concern that the communication speed may decrease due to an increase in the load on the operator network.

Even in the case of multi-path communication, it is desired to reduce the above-mentioned problems as much as possible.

In one embodiment of the present invention, the protocol conversion device converts a connection by the single-pass connection protocol into a first connection by the multi-pass connection protocol and a connection by the single-pass connection protocol by the multi. The first connection comprises one or more second protocol conversion units that convert into a second connection by a path connection, and the first connection comprises a plurality of first subflows formed on a plurality of routes spanning a plurality of groups. The second connection consists of one or more second subflows formed on a route within a single group of the plurality of groups.

Another embodiment of the present invention is a computer program that causes a computer to perform processing. In the embodiment, the process is a first process of converting a connection by the single-pass connection protocol into a first connection by the multipath connection protocol, and a connection by the single-pass connection protocol into a second connection by the multipath connection. The first connection comprises a second process of conversion, the first connection comprises a plurality of first subflows formed on a plurality of routes spanning a plurality of groups, and the second connection is simply a single in the plurality of groups. It consists of one or more second subflows formed on the pathway within one group.

Another embodiment of the present invention is a wireless communication device. In the first embodiment, the wireless communication device converts an interface for a plurality of mobile communication services from different providers of mobile communication services and a connection by a single-pass connection protocol into a first connection by a multi-pass connection protocol. A protocol conversion unit and one or more second protocol conversion units that convert a connection by the single-pass connection protocol into a second connection by the multi-pass connection are provided, and the first connection spans a plurality of groups. It is composed of a plurality of first subflows formed on a plurality of paths, and the second connection is composed of one or more second subflows formed on a path within a single group in the plurality of groups.

According to the present invention, it is possible to stabilize communication by using a plurality of routes spanning a plurality of groups, and even when it is inconvenient to use a route straddling a plurality of groups. , It can be avoided.

It is a block diagram of a wireless communication device. It is a block diagram of a router. It is explanatory drawing of the 1st protocol conversion part. It is explanatory drawing of the 2nd protocol conversion part. It is explanatory drawing of the access failure using a cache.

[1. Outline of the embodiment]

(1) The protocol conversion device according to the embodiment includes a first protocol conversion unit. The first protocol conversion unit converts a connection based on the single-pass connection protocol into a first connection based on the multipath connection protocol. The single path connection protocol is, for example, standard TCP. The multipath connection protocol is, for example, multimass TCP. The first connection comprises a plurality of first subflows. The first connection is, for example, a multipath TCP connection.

The protocol conversion device according to the embodiment includes one or more second protocol conversion units. Each of the one or more second protocol conversion units converts the connection by the single path connection protocol into the second connection by the multipath connection. The second connection comprises one or more second subflows. The second connection is, for example, a multipath TCP connection.

The first connection comprises a plurality of first subflows. The plurality of first subflows are formed on a plurality of routes spanning a plurality of groups. In communication using the first protocol conversion unit, since a plurality of routes spanning a plurality of groups are used, it is possible to stabilize the communication.

The second connection consists of one or more second subflows. The one or more second subflows are formed on one or more pathways within a single group in the plurality of groups. In communication using the second protocol conversion unit, only the route within a single group is used, so even if it is inconvenient to use a route that spans a plurality of groups, it is avoided. be able to. The one or more second subflows are preferably a plurality of second subflows. The above-mentioned inconvenience includes, but is not limited to, the cache access failure described later.

Here, the viewpoint from which a plurality of routes are divided into a plurality of groups is not particularly limited. Grouping of a plurality of routes for forming a plurality of groups may be performed, for example, in units of communication networks sharing a cache server, or in units of mobile communication service providers. Further, grouping of a plurality of routes may be performed in units of routes in which one second protocol conversion unit forms a second subflow. The plurality of routes divided into the plurality of groups may include routes that are not used for forming the second subflow by the second protocol conversion unit.

(2) The one or more second protocol conversion units are preferably a plurality of second protocol conversion units. As the number of the second protocol conversion units increases, a plurality of routes can be effectively used as the second subflow. It is preferable that the number of the plurality of second protocol converters is equal to the number of the plurality of groups.

(3) It is preferable to further include a route controller that selects the second protocol conversion unit used for communication among the plurality of second protocol conversion units. The route controller can select an appropriate second protocol converter.

(4) A plurality of transmission buffers provided corresponding to the plurality of routes are further provided, and each of the plurality of transmission buffers is a first buffer for the first subflow and a second buffer for the second subflow. It is preferable to provide. The first buffer and the second buffer allow the data of the first subflow and the data of the second subflow to be stored separately.

(5) The transmission priorities of the first buffer and the second buffer can be made different. For example, it is preferable that the first buffer has a higher transmission priority than the second buffer. In this case, the data of the first subflow can be preferentially transmitted.

(6) The first protocol conversion unit is for communication of the first data, the second protocol conversion unit is for communication of the second data, and the first data has a priority over the second data. It is preferable that the data has a high value. In this case, the first data having a high priority can be transmitted by the first subflow that uses many routes.

The first data is mission-critical data such as data for remote control of a vehicle, and the second data is data for Internet access for the general public, for example.

(7) The plurality of groups are preferably a group of the plurality of routes in a communication network unit sharing a cache server. The cache server is shared by, for example, a mobile communication service operator unit, and in this case, the communication network unit sharing the cache server is synonymous with the operator unit. If a plurality of routes are grouped in the communication network unit that shares the cache server, it is possible to suppress access failure using the cache in the second connection.

(8) In the plurality of groups, it is preferable that the plurality of routes are grouped in units of mobile communication service providers. Since the cache server is provided for each mobile communication service provider, if the plurality of routes are grouped for each provider, access failure using the cache can be suppressed in the second connection. ..
Here, the mobile communication service operator is a company that provides a mobile communication service, and refers to a mobile network operator (MNO) and a virtual mobile network operator (MVNO). Including.

(9) The computer program according to the embodiment causes a computer to execute a process. The process is a first process of converting a connection by a single-pass connection protocol into a first connection by a multipath connection protocol, and a second process of converting a connection by the single-pass connection protocol into a second connection by the multipath connection. The first connection comprises processing and is composed of a plurality of first subflows formed on a plurality of routes spanning a plurality of groups, and the second connection is within a single group in the plurality of groups. Consists of one or more second subflows formed on the path of. The computer program is stored on a computer-readable recording medium.

(10) The wireless communication device according to the embodiment converts interfaces for a plurality of mobile communication services from different providers of mobile communication services and a connection using a single-pass connection protocol into a first connection using a multi-pass connection protocol. A first protocol conversion unit is provided, and one or more second protocol conversion units that convert a connection based on the single-pass connection protocol into a second connection based on the multi-pass connection. The first connection is a plurality of groups. It is composed of a plurality of first subflows formed on a plurality of routes straddling the above, and the second connection is composed of one or more second subflows formed on a route within a single group in the plurality of groups. ..

[Details of 2 Embodiments]

[2.1 Wireless communication device]

FIG. 1 shows a wireless communication device 100 (hereinafter, referred to as “device 100”) mounted on the vehicle 10. The device 100 functions as a router that relays between a network of communication inside the vehicle 10 (communication inside the vehicle) and a network of communication outside the vehicle 10 (communication outside the vehicle).

The out-of-vehicle communication is, for example, wireless communication. The device 100 uses a plurality of wireless communication systems for stable communication. The plurality of wireless communication systems used by the device 100 may be the same type of wireless communication system or different types of wireless communication systems. The same type of wireless communication system is, for example, a wireless communication system having the same communication standard (for example, 5th generation mobile network (5G)). Heterogeneous wireless communication systems are, for example, mobile communication systems and wireless LANs, or 5G and 4G.

In the following, as a plurality of wireless communication systems, a plurality of 5G mobile communication systems having different mobile communication service providers will be described as an example. In FIG. 1, the base station of the operator A (Operator A) is indicated by “BS-A”, the base station of the operator B (Operator B) is indicated by “BS-B”, and the base station of the operator C (Operator C) is indicated by “BS-B”. Base stations are indicated by "BS-C".

Since the device 100 uses the mobile communication services of the plurality of businesses A, B, and C, the device 100 provides a plurality of network interfaces A-1, A-2, B-1, B-2, C-1, and C-2. Be prepared. The plurality of network interfaces are network interfaces A-1 and A-2 for A for using the mobile communication service of the operator A, network interface B-1 for B for using the mobile communication service of the operator B, and so on. Includes B-2 and network interfaces C-1 and C-2 for C for using the mobile communication service of the operator C. In FIG. 1, two interfaces A-1 to C-2 are provided for each business operator, but one interface may be provided for each business operator, or three or more interfaces may be provided for each business operator. The number may be different for each business operator.

In FIG. 1, since the device 100 includes six interfaces A-1 to C-2, it is equivalent to having six mobile stations. Therefore, the device 100 can form six wireless communication paths by utilizing the six interfaces A-1 to C-2. The mobile station here is a mobile station in the mobile communication system, and communicates with the base stations BS-A, BS-B, and BS-C in the mobile communication system.

The in-vehicle communication may be, for example, a wired communication such as a wired LAN, or a wireless communication such as a wireless LAN. In-vehicle communication is not limited to LAN, and may be short-range wireless communication or other communication networks. In-vehicle communication can include an in-vehicle network such as CAN (Controller Area Network). The illustrated device 100 includes, for example, a network interface 111 for a wired LAN and a network interface 112 for a wireless LAN.

The interface 111 is wiredly connected to, for example, an in-vehicle network device such as a network camera 201 and a vehicle controller 202 provided in the vehicle 10 via a LAN cable.

The interface 112 performs wireless communication with, for example, a mobile terminal (wireless LAN device) 300 inside the vehicle 10. The interface 112 functions as a wireless LAN access point. The mobile terminal (wireless LAN device) 300 is, for example, a mobile phone, a smartphone, a tablet, or a laptop computer owned by the crew members or passengers in the vehicle 10. The vehicle 10 is, for example, a vehicle in transportation such as a bus or a train, but is not limited to this.

The devices 201, 202, 300 connected to the interfaces 111, 112 can access the Internet via the device 100 and the mobile communication system network. For example, the in-vehicle network devices 201 and 202 perform communication related to the operation of the vehicle 10 with the server on the Internet. More specifically, the network camera 201 uploads an in-vehicle image to a server on the Internet via the device 100 and the mobile communication system for monitoring the inside or outside of the vehicle. Further, the vehicle controller 202 communicates with a server on the Internet for remote control or operation management of the vehicle 10. Further, the wireless LAN device 300 in the vehicle can access the server on the Internet via the device 100 and the mobile communication system.

The devices 201, 202, 300 may have a function as a mobile station in the mobile communication system. However, the devices 201, 202, and 300 can access the Internet even if they do not have the function as a mobile station by communicating via the device 100 that functions as a router.

In communication using millimeter waves or quasi-millimeter waves such as 5G, it may be difficult for radio waves to pass through the inside and outside of a space surrounded by metal such as a vehicle 10. Therefore, if an attempt is made to directly access the base stations BS-A, BS-B, and BS-C from the devices 201, 202, and 300 in the vehicle, communication may become unstable. On the other hand, when the base stations BS-A, BS-B, and BS-C are accessed via the device 100, stable communication becomes possible.

As shown in FIG. 2, the device 100 includes a router (protocol conversion device) 120 that routes between in-vehicle communication and out-of-vehicle communication. The router 120 is composed of, for example, a computer that executes a computer program. The computer has, for example, a processor and memory. The processor exerts a function as a router 120 by executing a program stored in the memory.

The router 120 includes a plurality of Multipath Transmission Control Protocol Converters 210, 221, 222, 223. Each of the protocol conversion units 210, 221, 222, and 223 forms a multipath TCP connection instead of a standard TCP (Standard TCP) connection for single-pass communication in out-of-vehicle communication. Multipath TCP is an extension of standard TCP to Multipath Operation (see Non-Patent Document 1).

In the embodiment, each of the protocol conversion units 210, 221, 222, and 223 converts a standard TCP (Standard TCP) connection that communicates with a single path into a multipath TCP connection.

The plurality of protocol conversion units 210, 221, 222, 223 include a first protocol conversion unit 210. In the embodiment, the first protocol conversion unit 210 is connected to the wired LAN interface 111. The first protocol conversion unit 210 forms a standard TCP connection (single path) with the devices 201 and 202. The first protocol conversion unit 210 converts the standard TCP connection between the devices 201 and 202 into multipath TCP and connects it to the communication outside the vehicle. That is, the first protocol conversion unit 210 converts a standard TCP connection into a first multipath TCP connection composed of one or a plurality of subflows in the transport layer.

As shown in FIG. 3, since the first protocol conversion unit 210 is connected to the six out-of-vehicle communication interfaces A-1 to C-2, the six subflows (first) are on the six wireless communication paths. Subflow) can be formed. In the first protocol conversion unit 210, these six interfaces A-1 to C-2 are registered as routes forming a subflow of multipath TCP. The first protocol conversion unit 210 uses the routes of a plurality of businesses A, B, and C for forming the first subflows A-1 to C-2. By using the routes of multiple carriers A, B, and C, the routes are made redundant, and even if the communication of one carrier's route becomes unstable, stable communication can be performed by the other carrier's route. can do.

Here, the subflows formed on the paths of the interfaces A-1 to C-1 by the first protocol conversion unit 210 are referred to as "first subflow A-1", "first subflow A-2", and "first subflow A-2", respectively. They are referred to as "1 subflow B-1", "first subflow B-2", "first subflow C-1", and "first subflow C-2". These subflows A1 to C-2 form a first multipath TCP connection. The usage of these subflows may be bonding or backup.

Returning to FIG. 2, the plurality of protocol conversion units 210, 221, 222, 223 include a plurality of second protocol conversion units 221, 222, 223. In the embodiment, the second protocol conversion units 211, 222, 223 are connected to the wireless LAN interface 112 via the route controller 250. The second protocol conversion units 221, 222, 223 form a standard TCP connection (single path) with the mobile terminal 300. The second protocol conversion unit 221, 222, 223 converts a standard TCP connection with the mobile terminal 300 into multipath TCP and connects it to out-of-vehicle communication. That is, the second protocol conversion unit 211,222,2223 converts a standard TCP connection into a second multipath TCP connection composed of one or a plurality of subflows in the transport layer.

As shown in FIG. 4, the second protocol conversion unit 221 is connected to two interfaces A-1 and A-2 for the operator A among the six interfaces A-1 to C-2. .. Therefore, the second protocol conversion unit 221 can form a second multipath TCP connection composed of two second subflows A-1 and A-2 on the two wireless communication paths. Two interfaces A-1 and A-2 are registered in the second protocol conversion unit 221 as routes forming a subflow of multipath TCP. The second protocol conversion unit 221 uses only the route of the operator A and does not use the routes of the other operators B and C for forming the second subflows A-1 and A-2.

The second protocol conversion unit 222 is connected to two interfaces B-1 and B-2 for the operator B among the six interfaces A-1 to C-2. Therefore, the second protocol conversion unit 222 can form a second multipath TCP connection composed of two second subflows B-1 and B-2 on the two wireless communication paths. Two interfaces B-1 and B-2 are registered in the second protocol conversion unit 222 as routes forming a subflow of multipath TCP. The second protocol conversion unit 222 uses only the route of the operator B and does not use the routes of the other operators A and C for forming the second subflows B-1 and B-2.

The second protocol conversion unit 223 is connected to two interfaces C-1 and C-2 for the operator C among the six interfaces A-1 to C-2. Therefore, the second protocol conversion unit 223 can form a second multipath TCP connection composed of two second subflows C-1 and C-2 on the two wireless communication paths. Two interfaces C-1 and C-2 are registered in the second protocol conversion unit 222 as routes forming a subflow of multipath TCP. The second protocol conversion unit 223 uses only the route of the operator C and does not use the routes of the other operators A and B for forming the second subflows C-1 and C-2.

In this way, each of the second protocol conversion units 221, 222, and 223 does not use a route that straddles a plurality of business operators A, B, and C as in the first protocol conversion unit 210, and is a single business operator. Use only the route of. That is, each of the second protocol conversion units 221, 222, and 223 can form a multipath TCP connection that does not span a plurality of operators, although the route redundancy is lower than that of the first protocol conversion unit 210. ..

The usage of the second subflows A-1 to C-2 may be bonding or backup.

In the embodiment, since the router 100 includes a plurality of second protocol conversion units 221, 222, 223, the mobile terminal 300 has a standard TCP connection with any of the plurality of second protocol conversion units 221, 222, 223. Can be formed. Which second protocol conversion unit 221, 222, 223 is used for communication is selected by the route controller 250 shown in FIG.

The route controller 250 selects one second protocol conversion unit used for communication by a certain mobile terminal 300 from a plurality of second protocol conversion units 221, 222, 223. The selection method is not particularly limited, but for example, the second protocol conversion unit can be selected according to the IP address of the terminal 300. Further, based on the number of connections of each of the plurality of second protocol conversion units 221, 222, 223, for example, the number of connections of each of the second protocol conversion units 221, 222, 223 can be selected so as to be substantially equal. .. Alternatively, among the interfaces A-1 to C-2, the second protocol conversion unit connected to the interfaces A-1 to C-2 having the best communication quality based on the communication quality index such as the communication speed and the packet loss rate is used. You can choose.

The device 100 includes a plurality of transmission buffers 270 for data transfer from the first protocol conversion unit 210 and the second protocol conversion units 221, 222, 223 to the interfaces A-1 to C-2. In the embodiment, the transmission buffer 270 includes six transmission buffers 270 corresponding to the six interfaces A-1 to C-2.

Each transmission buffer 270 includes a first buffer 271 and a second buffer 272. The transmission priority of the first buffer 271 is higher than that of the second buffer 272, and the data stored in the first buffer 271 is transmitted with priority over the second buffer 272.

In the embodiment, the first buffer 271 is for the first subflow and stores the transmission data given by the first protocol conversion unit 210. Further, the second buffer 272 is for the second subflow, and stores the transmission data given by the second protocol conversion units 221, 222, 223. Since the first buffer 271 has a higher transmission priority than the second buffer 272, the devices 201 and 202 that transmit data via the first protocol conversion unit 210 pass through the second protocol conversion units 221, 222 and 223. Each route A-1 to C-2 can be used with priority over the data of the terminal 300 for transmitting the data. That is, the communication on the first subflow has priority over the communication on the second subflow. Therefore, the devices 201 and 202 can transmit data with priority over the terminal 300, and can perform relatively stable communication by making the route redundant.

In the embodiment, the communication by the devices 201, 202 is related to the operation of the vehicle 10 and is mission critical. Therefore, the communication by the devices 201 and 202 is required to have higher priority and higher stability than the communication by the terminal 300 used by the passengers of the vehicle 10. By performing communication by such devices 201 and 202 by the first multipath TCP connection composed of the first subflow, higher priority and higher stability can be obtained.

On the other hand, in the embodiment, the communication by the terminal 300 is a communication for the general public such as passengers, or a communication having a low priority even if it is related to the operation of the vehicle 10. Communication by such a terminal 300 is performed by a second multipath TCP connection composed of a second subflow.

Here, the first multipath TCP connection that straddles the routes of a plurality of operators A and B may cause an access failure, but the second multipath TCP connection that uses only the routes of a single operator. Is less likely to cause access failure.

For example, as shown in FIG. 5, the access destination of the data terminal 300, and was content C of the Web server S _W on the Internet. Each carrier A, B, in order to prevent an increase in network load, the cache server S _A cache data on the _Internet, the S _B, common to dispose the mobile communication system of the carrier A, B is there. Content C, for example, are stored in the cache server S _A operators A.

In this case, the access destination IP address of the terminal 300, the IP address of the Web server _{S W,} the IP address of the cache server _{S A.} However, from a network of operators B, the cache server S _A different operators A often can not be accessed. Therefore, the sub-flow using a route operator B, you can not download the content C stored in the cache server S _A, failure to access the cache server S _A occurs. Therefore, if the access from the terminal 300 is performed by the first multipath TCP connection straddling the plurality of operators A and B, the cache cannot be used in the subflow using the route of the operator B, and the original access is made. access to the previous S _W is frequently occurs, the network load increases.

If the network load increases due to the communication of the terminal 300, the communication of the devices 201 and 202 having higher priority may become unstable.

As described above, since the first multipath TCP connection straddles the routes of a plurality of businesses A and B, the access using the cache may cause an access failure. On the other hand, since the second multipath TCP connection uses only the route of a single operator, it is possible to avoid the above-mentioned access failure.

On the other hand, since the first multipath TCP connection straddles the routes of a plurality of businesses A and B, it is suitable for access that does not use a cache. The communication of the devices 201 and 200 is a direct communication with a specific server on the Internet due to the necessity of real-time communication, prohibition of access by other users, and the like. Due to the nature of the communication content, there is no need to use the cache, and there is no particular problem.

As described above, in the present embodiment, the first multipath TCP connection having high redundancy is used to communicate with the devices 201 and 202 having high priority to ensure stability, and access failure due to cache use occurs. By communicating with the terminal 300 having a low priority by the second multipath TCP connection which is unlikely to occur, it is possible to suppress the influence on the communication having a high priority. As described above, in the present embodiment, communication having different priorities can coexist and the bandwidth can be effectively utilized.

[2.2 Modification example]

In the illustrated wireless communication device 100, the first protocol conversion unit 210 is connected to the interface 111, and the second protocol conversion units 221, 222, 223 are connected to an interface 112 different from the interface 111, but they are common. It may be connected to the interface of. In this case, whether the devices 201, 202 and the terminal 300 use the first protocol conversion unit or the second protocol conversion unit is determined by, for example, the route controller 250 having an identifier such as the SSID of the devices 201, 202 and the terminal 300. Can be judged based on. The identifier is included in the data transmitted by the devices 201, 202 and the terminal 300.

[3. Addendum]

It should be noted that the embodiments disclosed this time are exemplary in all respects and are not restrictive. The scope of the present invention is indicated by the scope of claims, not the above-mentioned meaning, and is intended to include the meaning equivalent to the scope of claims and all modifications within the scope.

10 Vehicle 100 Wireless communication device 111 Interface 112 Interface 120 Router (protocol converter)
210 1st protocol conversion unit 221 2nd protocol conversion unit 222 2nd protocol conversion unit 223 2nd protocol conversion unit 250 Controller 270 Transmission buffer 271 1st buffer 272 2nd buffer A-1 Interface A-2 Interface B-1 Interface B -2 Interface C-1 Interface C-2 Interface

Claims (10)

A first protocol conversion unit that converts a connection using the single-pass connection protocol into a first connection using the multipath connection protocol, and
One or more second protocol conversion units that convert a connection based on the single-pass connection protocol into a second connection based on the multipath connection.
With
The first connection comprises a plurality of first subflows formed on a plurality of routes spanning a plurality of groups.
Said second connection, Ri Do from one or more second sub-flow is formed on a path in a single group in the plurality of groups,
The plurality of groups are groups capable of making routes redundant with each other.
Protocol converter. The protocol conversion device according to claim 1, wherein the one or more second protocol conversion units are a plurality of second protocol conversion units. The protocol conversion device according to claim 2, further comprising a route controller for selecting a second protocol conversion unit used for communication among the plurality of second protocol conversion units. A plurality of transmission buffers provided corresponding to each of the plurality of routes are further provided.
The protocol conversion device according to any one of claims 1 to 3, wherein each of the plurality of transmission buffers includes a first buffer for the first subflow and a second buffer for the second subflow. The protocol conversion device according to claim 5, wherein the first buffer has a higher transmission priority than the second buffer. The first protocol conversion unit is for communication of the first data, and is used for communication.
The second protocol conversion unit is for communication of the second data, and is used for communication.
The protocol conversion device according to any one of claims 1 to 5, wherein the first data is data having a higher priority than the second data. The protocol conversion device according to any one of claims 1 to 6, wherein the plurality of groups are communication network units sharing a cache server, and the plurality of routes are grouped. The protocol conversion device according to any one of claims 1 to 6, wherein the plurality of groups are mobile communication service providers, and the plurality of routes are grouped. A computer program that lets a computer perform processing
The above processing
The first process of converting a connection using the single-pass connection protocol into a first connection using the multipath connection protocol, and
The second process of converting the connection by the single path connection protocol into the second connection by the multipath connection, and
With
The first connection comprises a plurality of first subflows formed on a plurality of routes spanning a plurality of groups.
Said second connection, Ri Do from one or more second sub-flow is formed on a path in a single group in the plurality of groups,
The plurality of groups are groups capable of making routes redundant with each other.
Computer program. Interfaces for multiple mobile communication services from different operators that provide mobile communication services,
A first protocol conversion unit that converts a connection using the single-pass connection protocol into a first connection using the multipath connection protocol, and
One or more second protocol conversion units that convert a connection based on the single-pass connection protocol into a second connection based on the multipath connection.
With
The first connection comprises a plurality of first subflows formed on a plurality of routes spanning a plurality of groups.
Said second connection, Ri Do from one or more second sub-flow is formed on a path in a single group in the plurality of groups,
The plurality of groups are groups capable of making routes redundant with each other.
Wireless communication device.

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