WO2017164015A1

WO2017164015A1 - Communication device and method

Info

Publication number: WO2017164015A1
Application number: PCT/JP2017/010255
Authority: WO
Inventors: 藤本　剛
Original assignee: 日本電気株式会社
Priority date: 2016-03-24
Filing date: 2017-03-14
Publication date: 2017-09-28
Also published as: JP2017175412A; JP6776572B2

Abstract

The purpose of the present invention is to provide a communication device and method capable of realizing stable communications. This communication device (10) is provided with: a plurality of communication interfaces (21-25); a storage unit (34) which stores an IP address and a port number in association with each of the plurality of communication interfaces (21-25); a selection unit (31) which selects, on the basis of the communication environment of the plurality of communication interfaces (21-25), a desired communication interface from among the plurality of communication interfaces (21-25); and a data setting unit (33) which sets, to the transmission origin IP address of transmission data to be transmitted from the desired communication interface, the IP address of the desired communication interface, and sets, to the transmission origin port number of the transmission data, the port number of the desired communication interface.

Description

Communication apparatus and method

The present invention relates to a communication apparatus and method, and more particularly, to a communication apparatus and method capable of realizing stable communication by selecting an optimal communication interface from a plurality of communication interfaces.

Which communication system can perform stable communication in consideration of the communication environment and communication cost in the presence of multiple communication systems such as wireless LAN (Local Area Network), mobile phones, Ethernet (registered trademark), etc. It is difficult to judge. In addition, an IP address associated with the communication interface is set, and this IP address is used to select the communication interface. However, if a single device has multiple sensors under its control, and multiple subordinate sensors accidentally attempt to establish a session using the same source port number, the device will set an IP address. However, there is a problem that it is difficult to select a desired communication interface and to realize stable communication.

Patent Document 1 discloses that the optimum interface searching means receives an ACK packet from any one of the communication interfaces, and among the received ACK packets, the communication interface of the first received ACK packet is set as the optimum communication interface. Has been.

In Patent Document 2, each transmission path state (bottleneck bandwidth, RTT delay difference, etc.) is acquired for a transmission path, registered in each transmission path information table, and the transmission path with the highest priority is selected. Is disclosed.

In Patent Literature 3, when protocol information indicating a protocol is input from a wireless LAN interface unit, the interface selection unit is based on a priority order for selecting a communication interface unit previously associated with movement speed information and protocol information. , Selecting a communication interface unit of a WAN side communication unit is disclosed.

JP 2006-33080 A International Publication No. 2006/129600 JP 2010-021878 A

As described above, there is a problem that it is difficult to select a desired communication interface and to realize stable communication only by setting the IP address of the communication interface.

The present invention has been made to solve such problems, and an object thereof is to provide a communication apparatus and method capable of realizing stable communication.

The communication apparatus according to the present invention is based on a plurality of communication interfaces, a storage unit that stores each of the plurality of communication interfaces, an IP address and a port number in association with each other, and a communication environment of the plurality of communication interfaces. A selection unit that selects a desired communication interface from the plurality of communication interfaces; an IP address of the desired communication interface is set in a transmission source IP address of transmission data transmitted from the desired communication interface; and transmission of the transmission data A data setting unit that sets the port number of the desired communication interface to the original port number.

The method according to the present invention includes a step of storing each of a plurality of communication interfaces, an IP address and a port number in association with each other, and a desired communication from the plurality of communication interfaces based on a communication environment of the plurality of communication interfaces. Selecting an interface; setting an IP address of the desired communication interface to a transmission source IP address of transmission data transmitted from the desired communication interface; and setting a transmission source port number of the transmission data to the desired communication interface Setting a port number.

According to the present invention, it is possible to provide a communication apparatus and method capable of realizing stable communication.

1 is a block diagram illustrating a gateway device according to a first embodiment. 1 is a block diagram illustrating a gateway device according to a first embodiment. It is a figure which illustrates an IP address and a port number. 2 is a sequence diagram illustrating a system according to the first embodiment. FIG.

[Embodiment 1]
Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram illustrating a gateway device according to the first embodiment.

As shown in FIG. 1, the gateway device 10 includes a communication interface unit 20 having a plurality of communication interfaces 21 to 25, a storage unit 34, and a selection unit 31 for selecting a desired communication interface from the plurality of communication interfaces 21 to 25. And a data setting unit 33 for setting a transmission source IP address and a transmission source port number of transmission data Td transmitted from a desired communication interface. The storage unit 34 stores each of the plurality of communication interfaces 21 to 25, the IP address, and the port number in association with each other. The selection unit 31 selects a desired communication interface based on the communication environment of the plurality of communication interfaces 21 to 25. The data setting unit 33 sets the IP address of the desired communication interface as the transmission source IP address of the transmission data Td, and sets the port number of the desired communication interface as the transmission source port number of the transmission data Td.

Outside the gateway device 10, there are a plurality of communication networks such as a wired network 21n, a Wi-Fi (Wireless Fidelity) network 23n, and a cellular network 24n. Then, the selected desired interface is connected to the corresponding communication network. The wired network 21n is, for example, a network such as a WAN (Wide Area Network) or a LAN (Local Area Network).

In Embodiment 1, since a desired communication interface is selected using an IP address and a port number, stable communication can be realized.

FIG. 2 is a block diagram illustrating a gateway device according to the first embodiment.
As illustrated in FIG. 2, the gateway device 10 is connected to the server 60 via a plurality of communication networks such as a wireless or wired network. The communication interface 21 of the communication interface unit 20 is, for example, a wired Ethernet (registered trademark). The communication interface 22 is a ZigBee (registered trademark) / Wi-SUN (registered trademark) interface in the 920 MHz (megahertz) band. The communication interface 23 is a 5 GHz (gigahertz) band Wi-Fi interface. The communication interface 24 is a cellular interface such as 3G (3rd generation) or LTE (Long Term Evolution). The communication interface 25 is a 2.4 GHz band Wi-Fi interface. The gateway device 10 has, for example, a sensor 41 under its control. The gateway device 10 includes a control unit 32 that selects a desired communication interface based on the response time t of the transmission data for measurement Tm and instructs the selection unit 31 to make a selection instruction.

For example, a router 70 is provided outside the gateway device 10 and connected to the communication interface 21 by wire. In addition,

access points

81 and 82 are provided outside the gateway device 10 and are wirelessly connected to the

communication interfaces

22 and 23, respectively. A base station 50 is provided outside the gateway device 10 and is connected to the communication interface 24 by radio. Then, the selected desired communication interface and the server 60 are connected via one of a plurality of communication networks.

Each of the gateway device 10 and the communication interfaces 21 to 25 is associated with a different IP address. The gateway device 10 has an IP address associated with 10.0.0.1, for example. The communication interface 24 has an IP address associated with 1.1.1.1. The communication interface 25 has an IP address associated with 192.168.1.10. The IP address of the server 60 is associated with 100.100.100.1. The IP address of the sensor 41 is associated with 192.168.1.11.

Here, transmission of the sensor information J1 received from the sensor 41 to the server 60 via the gateway device 10 will be described.

FIG. 3 is a diagram illustrating an IP address and a port number.
The upper part of FIG. 3 is a diagram illustrating a packet header when the sensor 41 transmits to the gateway device 10.
The middle part of FIG. 3 is a diagram illustrating a packet header when the sensor 42 transmits to the gateway device 10.
The lower part of FIG. 3 is a diagram illustrating a packet header when the gateway apparatus 10 transmits a packet received from a sensor to the server 60.

As shown in the upper part of FIG. 3, when the sensor 41 transmits the sensor information J1 as an IP packet, 192.168.1.11 is set as the source IP address, and the source port number is not used by itself. Select a random number from the numbers. In this example, 30001 is selected. The IP address 100.100.100.1 of the server 60 is set as the destination IP address.

The selection unit 31 selects a desired communication interface based on the communication environment of the plurality of communication interfaces 21 to 25. In this example, the desired communication interface is the communication interface 24. The selection unit 31 selects a communication interface different from the desired communication interface from the plurality of communication interfaces 21 to 25. In this example, another communication interface is the communication interface 25.

The data setting unit 33 receives the IP packet of the sensor information J1 via the communication interface 25. As shown in the lower part of FIG. 3, the data setting unit 33 writes the IP address 1.1.1.1 of the communication interface 24 in the source IP address portion of the header information of the IP packet received from the sensor information J1. Instead, the port number of the transmission source is rewritten to a port number that is not used by itself. In this example, the port number 30000 is set. If the port number 30001 is not used, it need not be changed. The sensor information J1 in which the IP address and the port number are set is transmitted to the server 60 through the communication interface 24 as transmission data Td.

That is, the source IP address and the source port number are set (rewritten) in the gateway device 10 and the sensor information J1 is transmitted to the server 60 via the desired communication interface as transmission data Td. In this case, the transmission data Td is sensor information J1 acquired via another communication interface.

When a sensor 42 other than the sensor 41 exists under the gateway device 10, the sensor 42 randomly selects a source port number from numbers not used by the sensor 42 itself. Therefore, as shown in the middle part of FIG. 3, the sensor 42 may accidentally use the same source port number as the port number selected by the sensor 41.

When the sensor 41 and the sensor 42 accidentally try to establish a session using the same transmission source port number, the gateway device 10 changes only the transmission source IP address and transmits it to the server 60. Will not stick. That is, the gateway device 10 cannot distinguish whether the sensor information J1 is sensor information received from the sensor 41 or the sensor 42.

Also, for example, when the gateway apparatus 10 receives a response message from the server 60 corresponding to the sensor information J1, the gateway apparatus 10 does not know which sensor, the sensor 41 or the sensor 42, may transfer the response message.

Therefore, in the first embodiment, not only the source IP address but also the source port number is rewritten so that there is no duplicate session.

The storage unit 34 then transmits the source IP address and source port number when the IP packet (sensor information J1) is received from the sensor 41, and the source IP address and transmission of the IP packet after the gateway device 10 rewrites. Four pieces of information including the original port number are associated and stored. Then, based on this stored information, the source port number portion is rewritten to an unused port number.

When the gateway device 10 receives the response packet (response data Rd) returned from the server 60 via the communication interface 24, the gateway device 10 refers to the stored information so that the IP address can be transmitted to the transmission source sensor 41. Rewrite the header part of the packet.

In this example, the packet is transmitted only to the communication interface 24. However, the packet is simultaneously transmitted to the other communication interfaces 21 to 23 and the like, and the one having a quick response is selected as a desired communication interface. Further, at least one of the IP address and the port number is different between the desired communication interface and another communication interface. Further, the communication interface 25 which is another communication interface may be selected from the plurality of communication interfaces 21 to 25 based on the communication environment of the plurality of communication interfaces 21 to 25.

Next, transmission of the sensor information J1 received from the sensor 41 to the server 60 via the gateway device 10 will be described with reference to the sequence diagram shown in FIG. In the first embodiment, the measurement transmission data Tm is transmitted to all the plurality of communication interfaces 21 to 25, and the communication interface with the fastest response is selected as the desired communication interface. In this example, for the sake of simplicity, a case where the measurement transmission data Tm is not transmitted to all of the plurality of communication interfaces but the measurement transmission data Tm is transmitted to the communication interfaces 23 and 24 is shown.

FIG. 4 is a sequence diagram illustrating the system according to the first embodiment.
As shown in FIG. 4, the data setting unit 33 generates measurement transmission data Tm and transmits it to the selection unit 31. When generating the measurement transmission data Tm, the data setting unit 33 sets the IP address 100.100.100.1 of the server 60 as the transmission destination IP address of the measurement transmission data Tm and sets the gateway device as the transmission source IP address. 10 IP addresses 10.0.0.1 are set. In this way, the data setting unit 33 generates the measurement transmission data Tm including the transmission source IP address and the transmission destination IP address in the header, and transmits the measurement transmission data Tm to the selection unit 31 (step S101).

The selection unit 31 transmits information indicating that there is measurement transmission data Tm to the control unit 32 (step S102).

The control unit 32 converts the measurement transmission data Tm into transmission data suitable for the communication interface 23, and issues an instruction to reset (rewrite) the transmission source IP address in the header of the measurement transmission data Tm to the IP address of the communication interface 23. It transmits to the selection part 31. Further, the control unit 32 changes the measurement transmission data Tm to transmission data suitable for the communication interface 24, resets the transmission source IP address in the header to the IP address of the communication interface 24, and sets the transmission source port number in the header. An instruction to reset the port number of the communication interface 24 is transmitted to the selection unit 31 (step S103).

Also, the control unit 32 stores the transmission times of these measurement transmission data Tm.

In this example, the control unit 32 instructs the selection unit 31 to reset the information in the header of the measurement transmission data Tm. However, the control unit 32 may also perform the instruction to the data setting unit 33. .

The selection unit 31 converts the measurement transmission data Tm into transmission data suitable for the communication interface 23 according to the instruction of the control unit 32, and resets (rewrites) the transmission source IP address in the header to the IP address of the communication interface 23. The selection unit 31 changes the measurement transmission data Tm to transmission data suitable for the communication interface 24, resets the transmission source IP address in the header to the IP address of the communication interface 24, and sets the transmission source port number to the port of the communication interface 24. Set the number again. The selection unit 31 transmits the measurement transmission data Tm to the communication interfaces 23 and 24 (step S104). These measurement transmission data Tm are transmitted to the communication interfaces 23 and 24 simultaneously. Further, when the measurement transmission data Tm is transmitted to all the plurality of communication interfaces 21 to 24, the measurement transmission data Tm is transmitted to the communication interfaces 21 to 24 at the same time.

The communication interface 23 outputs the measurement transmission data Tm input from the selection unit 31 to the network 23n (step S105). When the communication quality of the network 23n is good and communication is possible, the measurement transmission data Tm is transmitted to the server 60 via the network 23n. When the communication quality of the network 23n is poor, the server 60 cannot receive the measurement transmission data Tm.

The server 60 transmits response data Rd corresponding to the measurement transmission data Tm to the communication interface 23 that is the transmission source. When the communication quality of the network 23n is poor, the server 60 cannot receive the measurement transmission data Tm, and therefore cannot transmit the response data Rd, or it takes a long time to transmit the response data Rd.

The communication interface 23 transmits the received response data Rd to the selection unit 31 (step S111).

The communication interface 24 outputs the measurement transmission data Tm input from the selection unit 31 to the network 24n (step S106). When the communication quality of the network 24n is good and communication is possible, the measurement transmission data Tm is transmitted to the server 60 via the network 24n. When the communication quality of the network 24n is poor, the server 60 cannot receive the measurement transmission data Tm.

The server 60 transmits response data Rd corresponding to the measurement transmission data Tm to the communication interface 24 that is the transmission source. The response data Rd is received by the communication interface 24 via the network 24n.

The communication interface 24 transmits the received response data Rd to the selection unit 31 (step S112).

In this example, the server 60 transmits the response data Rd, but is not limited to this. Another device on the network 23n or the network 24n may transmit the response data Rd.

The selection unit 31 receives the response data Rd and notifies the control unit 32 of information related to the reception time of the response data Rd received from the communication interface 23. Further, the selection unit 31 notifies the control unit 32 of information regarding the reception time of the response data Rd received from the communication interface 24 (step S113).

The control unit 32 obtains a response time t for each measurement transmission data Tm using the transmission time of the measurement transmission data Tm and the reception time of the response data Rd. For example, the difference between the transmission time of the measurement transmission data Tm and the reception time of the response data Rd may be set as the response time t. The control unit 32 transmits an instruction for selecting the communication interface 24, which is the communication interface with the shortest response time t, as a desired communication interface to the selection unit 31 and the data setting unit 33 (step S114). In this example, since the communication interface 24 has the shortest response time t, the communication interface 24 is selected as the desired communication interface, and the communication interface 23 is not selected.

In addition, the control unit 32 transmits an instruction for notifying the communication partner of the communication interface 23 that is not selected as a desired communication interface to limit the communication function to the selection unit 31 and the data setting unit 33 (step S31). S115).

The data setting unit 33 generates restriction transmission data Tr for notifying that the communication function is restricted in accordance with an instruction from the control unit 32 and transmits the restriction transmission data Tr to the selection unit 31 (step S116).

The selection unit 31 selects the communication interface 23 according to the instruction from the control unit 32 (step S117).

The restriction transmission data Tr for notifying that the generated communication function is restricted is transmitted to the access point 82 via the communication interface 23. In this way, the communication partner other than the desired communication interface is notified that the communication function is restricted.

The restriction transmission data Tr is received by the access point 82 and used to restrict the communication function. For example, the communication function may be limited by limiting the power supply of the part related to the communication function. By using the limit transmission data Tr to limit the power supply, the power consumption can be kept low.

For example, when TCP (Transmission Control Protocol) / IP (Internet Protocol) is used, the transmission data for restriction Tr may use a TCP reset packet.

Further, when the measurement transmission data Tm is transmitted to all of the plurality of communication interfaces 21 to 24 and the response time t is obtained, the limitation transmission data Tr is applied to all the communication interfaces not selected as the desired communication interface. Send and restrict the communication function of the other party.

Next, the selection unit 31 selects the communication interface 24 as a desired communication interface according to the instruction shown in step S114 (step S118).

Further, the selection unit 31 selects a communication interface different from the desired communication interface from the plurality of communication interfaces 21 to 25 (step S119). Another communication interface may be selected by a predetermined IP address and port number. In this example, the communication interface 25 is selected as another communication interface.

Sensor information J1 of the sensor 41 is received via the communication interface 25. At this time, 192.168.1.11 which is the IP address of the sensor 41 is set in the transmission source IP address in the header of the sensor information J1, the transmission source port number is set to 30001, and the transmission destination IP address is set as the transmission destination IP address. Is set to the IP address 100.100.100.1 of the server 60.

The selection unit 31 converts the received sensor information J1 into transmission data suitable for the communication interface 24 according to an instruction from the control unit 32, sets the transmission source IP address in the header to the IP address of the communication interface 24, and sets the transmission source port number. Is set to the port number of the communication interface 24, and the destination IP address is set to the IP address of the server 60. The selection unit 31 transmits the sensor information J1 in which the IP address and the port number are set to the communication interface 24 as transmission data Td (step S120).

The transmission data Td is transmitted from the communication interface 24 to the server 60 via the network 24n.

In the first embodiment, by associating the communication interface, the IP address, and the port number with each other, not only the transmission source IP address but also the transmission source port number is set so that there is no duplication of the session. A desired interface can be specified by the number.

In the first embodiment, since the communication interface with the shortest response time t is selected as the desired communication interface, the communication time delay between the gateway device 10 and the server 60 can be reduced.

As a result, it is possible to provide a communication apparatus and method capable of realizing stable communication.

There are the following methods for selecting a desired communication interface.

Calculating the maximum communication speed of each of the plurality of communication interfaces 21 to 25 in theory or communication standard. The current communication speed of each of the plurality of communication interfaces 21 to 25 is measured. Then, the selection unit 31 selects a communication interface having the largest difference between the maximum communication speed and the measured communication speed as a desired communication interface.

As a result, the communication interface with the largest communication capacity is selected as the desired communication interface, so that even when the data amount of the transmission data Td changes, it is possible to flexibly cope with it.

Also, the maximum communication speed of each of the plurality of communication interfaces 21 to 25 is calculated based on the theoretical or communication standard. The current communication speed of each of the plurality of communication interfaces 21 to 25 is measured. The difference between the maximum communication speed and the measured communication speed is calculated. Communication interfaces whose difference is equal to or less than a predetermined threshold are excluded from the plurality of communication interfaces 21 to 25. And the selection part 31 selects a desired communication interface based on the communication environment of the some communication interface after exclusion.

This eliminates communication interfaces that do not have sufficient communication capacity, allowing communication connections to be attempted using the remaining communication interfaces.

Also, a different priority is associated with each of the plurality of communication interfaces 21 to 25. Then, the selection unit 31 selects a communication interface having a response time t for the measurement transmission data Tm within a predetermined time and having the highest priority as a desired communication interface.

Also, as a radio frequency characteristic, it is known that a radio signal with a low frequency has a low transmission speed but a long transmission distance. Thereby, when a low-frequency radio signal is used, communication congestion is likely to occur. Therefore, a higher priority is set for a communication interface that uses a higher frequency than a communication interface that uses a lower frequency. Accordingly, a communication interface that uses a high frequency is easily selected, and communication congestion is less likely to occur.

Also, the communication interface 21 that is wired communication is easier to select than the communication interfaces 21 to 24 that are wireless communication. Therefore, the priority may be adjusted so that the communication interface 21 is not easily selected.

Also, the received electric field strength of each of the plurality of communication interfaces 21 to 25 is measured. Then, the selection unit 31 selects a communication interface corresponding to the reception electric field strength having the maximum reception electric field strength as a desired communication interface. The frequency of the communication interface 25 which is a 2.4 GHz band Wi-Fi interface is close to the frequency used in a microwave oven or Bluetooth (registered trademark). Even when interference occurs due to a microwave oven or Bluetooth (registered trademark), another communication interface can be selected. Thereby, the throughput of communication between the gateway device 10 and the server 60 is improved.

Note that the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention.

In the above-described embodiment, the present invention has been described as a hardware configuration, but the present invention is not limited to this. The present invention can also realize arbitrary processing by causing a CPU (Central Processing Unit) to execute a computer program.

Further, the above-described program can be stored using various types of non-transitory computer readable media and supplied to a computer. Non-transitory computer readable media include various types of tangible storage media. Examples of non-transitory computer-readable media include magnetic recording media (eg, flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg, magneto-optical disks), CD-ROM (Read Only Memory) CD-R, CD -R / W, including semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (Random Access Memory)). In addition, the program may be supplied to the computer by various types of temporary computer readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.

The present invention has been described above with reference to the embodiment, but the present invention is not limited to the above. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the invention.

This application claims priority based on Japanese Patent Application No. 2016-059871 filed on Mar. 24, 2016, the entire disclosure of which is incorporated herein.

DESCRIPTION OF SYMBOLS 10 ... Gateway apparatus 20 ... Communication interface part 21-25 ... Communication interface 21n ... Communication network (wired network) 23n ... Communication network (Wi-Fi network) 24n ... Communication network (Cellular network) 31 ... Selection part 32 ... Control part 33 ... Data setting part 34 ...

Storage part

41, 42 ... Sensor 50 ... Base station 60 ... Server 70 ...

Router

81, 82 ... Access point

Claims

Multiple communication interfaces;
Storage means for storing each of the plurality of communication interfaces, an IP address, and a port number in association with each other;
Selecting means for selecting a desired communication interface from the plurality of communication interfaces based on a communication environment of the plurality of communication interfaces;
Data setting for setting the IP address of the desired communication interface as the source IP address of the transmission data transmitted from the desired communication interface, and setting the port number of the desired communication interface as the source port number of the transmission data Means,
A communication device comprising:
The selecting means selects a communication interface different from the desired communication interface from the plurality of communication interfaces,
The transmission data is acquired via the another communication interface,
The desired communication interface and the other communication interface differ in at least one of an IP address and a port number,
The communication apparatus according to claim 1.
The another communication interface is selected from the plurality of communication interfaces based on a communication environment of the plurality of communication interfaces.
The communication apparatus according to claim 2.
The selection means selects a communication interface with the shortest response time for the transmission data as the desired communication interface.
The communication device according to any one of claims 1 to 3.
Calculating the maximum communication speed of each of the plurality of communication interfaces;
Measuring a current communication speed of each of the plurality of communication interfaces;
The selecting means selects a communication interface having a largest difference between the maximum communication speed and the communication speed as the desired communication interface.
The communication device according to any one of claims 1 to 3.
Calculating the maximum communication speed of each of the plurality of communication interfaces;
Measuring a current communication speed of each of the plurality of communication interfaces;
Calculate the difference between the maximum communication speed and the communication speed,
Excluding communication interfaces having the difference equal to or less than a predetermined threshold from the plurality of communication interfaces;
The selection means selects the desired communication interface based on the communication environment of the plurality of interfaces after the exclusion.
The communication device according to any one of claims 1 to 3.
Associating different priorities with each of the plurality of communication interfaces;
The selecting means selects a communication interface having a highest response priority within a predetermined time for the transmission data as the desired communication interface.
The communication device according to any one of claims 1 to 3.
Measuring the received electric field strength of each of the plurality of communication interfaces;
The selecting means selects a communication interface corresponding to the received electric field strength having the maximum received electric field strength as the desired communication interface.
The communication device according to any one of claims 1 to 3.
Notifying the other party of communication other than the desired communication interface that the communication function is restricted,
The communication device according to any one of claims 1 to 8.
Storing each of a plurality of communication interfaces, an IP address and a port number in association with each other;
Selecting a desired communication interface from the plurality of communication interfaces based on a communication environment of the plurality of communication interfaces;
Setting an IP address of the desired communication interface as a transmission source IP address of transmission data transmitted from the desired communication interface, and setting a port number of the desired communication interface as a transmission source port number of the transmission data; ,
With a method.