JP2019071593A - Communication device, communication system, communication method, and program - Google Patents

Abstract

To mitigate an impact of packet loss on a communication network in packet communication.SOLUTION: A communication device includes: packet distribution means for assigning sequence numbers to packets received sequentially and distributing each packet with the sequence number assigned to one communication network or a plurality of communication networks; and transmission means for transmitting each packet distributed to the one communication network or the plurality of communication networks to a reception side using a distribution destination communication network.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a technique for mitigating the effect of packet loss occurring on a communication network in packet communication.

  Recent technological advances in mobile terminals such as smart phones have increased the number of cases where mobile terminals connected to a wireless communication network such as a mobile telephone network perform real-time communication.

  In a wireless communication network, packet loss often occurs due to radio wave conditions and the like. As techniques for mitigating the effects of packet loss, packet retransmission techniques such as Transmission Control Protocol (TCP) and techniques for providing redundancy to signals such as Forward Error Correction (FEC) are known. There is.

JP, 2013-030890, A

  However, with packet retransmission technology such as TCP, since a process of detecting packet loss and retransmitting is performed, a waiting time occurs before the retransmitted data can be used, and real-time communication such as video call etc. It is difficult to use it.

  In addition, in the technique of giving redundancy to signals such as FEC, the missing part is complemented by using information immediately before and after the missing part, but in a wireless communication network, for example, a series of signals according to radio wave conditions. In this case, it is not possible to compensate for the missing part by the technique of making the signal redundant, in such a case.

  The present invention has been made in view of the above points, and it is an object of the present invention to provide a technique for alleviating the influence of packet loss on a communication network in packet communication.

According to the disclosed technique, packet distributing means for assigning sequence numbers to sequentially received packets and distributing each packet with the sequence number to one communication network or a plurality of communication networks;
There is provided a communication apparatus comprising: transmission means for transmitting each packet distributed to the one communication network or the plurality of communication networks to a receiving side using a communication network of a distribution destination.

  According to the disclosed technology, in packet communication, it is possible to mitigate the influence of packet loss on a communication network.

It is a communication system block diagram in an embodiment of the invention. FIG. 2 is a functional configuration diagram of the communication device 100. FIG. 2 is a functional configuration diagram of a communication device 200. It is a figure which shows the example of a hardware configuration. It is a figure for demonstrating the operation example 1 of a communication system. It is a figure for demonstrating the operation example 2 of a communication system. FIG. 16 is a block diagram of a terminal 300 in an operation example 3; It is a figure for demonstrating the operation example 3 of a communication system.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments described below are merely examples, and the embodiments to which the present invention is applied are not limited to the following embodiments.

(System configuration)
FIG. 1 is a diagram showing a configuration example of a communication system in the present embodiment. As shown in FIG. 1, the communication system includes a communication apparatus 100 on the transmission side and a communication apparatus 200 on the reception side, which are connected to a communication network A, a communication network B, and a communication network C. Further, a terminal 300 is connected to the communication device 100, and a terminal 400 is connected to the communication device 200.

  The communication network A, the communication network B, and the communication network C are wireless communication networks such as a cellular phone network and a wireless LAN. For example, communication network A is a communication network of mobile phone company D, communication network B is a communication network of mobile phone company S, and communication network C is a communication network of mobile phone company K. However, the present invention is not limited to this, and any or all of the communication network A, the communication network B, and the communication network C may be a wired communication network (for example, a fixed telephone network). In this embodiment, lines of a plurality of communication networks are bundled and used as a virtual high-quality line.

  In addition, although the example which uses three communication networks is shown in FIG. 1, the number of communication networks to be used is not restricted to three, for example, two may be sufficient, and more than three communication networks may be used. You may use it.

  In the configuration of FIG. 1, the communication apparatus 100 sequentially receives packets from the terminal 300, assigns sequence numbers to the received packets, and assigns each packet to which the sequence number is assigned to the communication network A, communication network B, and communication network C. It distributes to one or more of the communication networks and transmits.

  The communication device 200 receives the packet transmitted by the communication device 100 from the communication network A, the communication network B, and the communication network C, and based on the sequence numbers assigned to the packets, the packets are transmitted in the order of sequence numbers. Transmit to terminal 400.

  The communication device 100 is assumed to have a packet transmission function, and the communication device 200 is assumed to have a packet reception function, but both the communication device 100 and the communication device 200 have both a packet transmission function and a packet reception function. It is also good. Each communication device may be referred to as a "controller."

  The terminal 300 on the transmission side is, for example, an apparatus including a camera, and in this case, the terminal 300 transmits a packet of video captured by the camera. Also, in this case, the terminal 400 on the receiving side displays an image by decoding and reproducing data of the received packet.

  It is only an example that the packet to be transmitted is a video packet. The technique according to the present invention is basically applicable regardless of the type of packet.

  FIG. 2 is a functional configuration diagram of the communication apparatus 100 on the transmission side. As shown in FIG. 2, the communication apparatus 100 includes an input unit 110, a sequence number assignment unit 120, a packet distribution processing unit 130, and a communication unit 140.

  The input unit 110 inputs a packet output from the terminal 300. The sequence number assigning unit 120 assigns sequence numbers to packets in the order of input. The packet distribution processing unit 130 determines, for each packet, a communication network to be used for transmission to the opposite communication device 200, and distributes the packet to the determined communication network. When the packet distribution processing unit 130 distributes the same packet to a plurality of communication networks, the packet distribution processing unit 130 copies (copies) the packet and distributes the original packet and the copied packets to a plurality of communication networks. Note that the packet distribution processing unit 130 distributes packets to a certain communication network in more detail, for example, by passing the packet to a functional unit in the communication unit 140 that performs wireless communication using the communication network. is there.

  The communication unit 140 includes a functional unit that performs communication using the communication network A, a functional unit that performs communication using the communication network B, and a functional unit that performs communication using the communication network C. The communication unit 140 also has a function of measuring the quality (reception strength (RSRP etc.), reception quality (RSSI), delay etc.) of the communication network A, the communication network B, and the communication network C. The measured quality of each communication network is passed to the packet distribution processing unit 130. The packet distribution processing unit 130 can use the quality of each communication network when selecting a communication network to which a packet is to be distributed.

  FIG. 3 is a functional block diagram of the communication apparatus 200 on the receiving side. As shown in FIG. 3, the communication apparatus 200 includes a communication unit 210, a packet order alignment unit 220, and an output unit 230.

  Communication unit 210 includes a functional unit that performs communication using communication network A, a functional unit that performs communication using communication network B, and a functional unit that performs communication using communication network C. The communication unit 210 also includes a function of measuring the quality of each communication network.

  The packet order arranging unit 220 has a function of arranging the packets in the order of the sequence numbers by using the received packet sequence numbers. Also, when receiving a plurality of packets with the same sequence number from the communication unit 210, the packet order sorting unit 220 selects one packet from the plurality of packets and discards the other packets. In the selection, among the plurality of packets, packets received from the communication network with the highest quality may be selected.

  The output unit 230 deletes the sequence number from each packet passed from the packet order arranging unit 220 in the order of the sequence number, and outputs the packet to the terminal 400.

  Each of the above-described devices (the terminal 300, the communication device 100, the communication device 200, and the terminal 400) can be realized by causing a computer to execute a program in which the processing content described in the present embodiment is described. That is, the function of the device can be realized by executing a program corresponding to a process performed by the device using hardware resources such as a CPU and a memory incorporated in the computer. The program can be recorded on a computer readable recording medium (portable memory or the like), and can be stored or distributed. Moreover, it is also possible to provide the above program through a network such as the Internet or e-mail.

  FIG. 4 is a diagram showing an example of the hardware configuration of the above-mentioned apparatus. The device of FIG. 4 includes a drive device 1000, an auxiliary storage device 1002, a memory device 1003, a CPU 1004, an interface device 1005, a display device 1006, an input device 1007, and the like mutually connected by a bus B. Note that the communication device 100 and the communication device 200 may not include the display device 1006 and the input device 1007.

  A program for realizing processing in the device is provided by a recording medium 1001 such as a CD-ROM or a memory card, for example. When the recording medium 1001 storing the program is set in the drive device 1000, the program is installed from the recording medium 1001 to the auxiliary storage device 1002 via the drive device 1000. However, the program does not have to be installed from the recording medium 1001, and may be downloaded from another computer via a network. The auxiliary storage device 1002 stores the installed program and also stores necessary files and data.

  The memory device 1003 reads out the program from the auxiliary storage device 1002 and stores it when there is an instruction to start the program. The CPU 1004 implements the function related to the device according to the program stored in the memory device 1003. The interface device 1005 is used as an interface for connecting to a network. For example, the interface device 1005 is used as the input unit 110 and the communication unit 140 in the communication device 100. Also, for example, the interface device 1005 is used as the communication unit 210 and the output unit 230 in the communication device 200.

  The display device 1006 displays a graphical user interface (GUI) according to a program. The input device 1007 includes a keyboard and a mouse, buttons, or a touch panel, and is used to input various operation instructions.

  Hereinafter, an operation example of the communication system having the above-described configuration will be described. In the description of the operation example, the names of the functional units shown in FIG. 2 and FIG. 3 are appropriately used. The operation to be performed can be switched, for example, by setting the communication apparatuses 100 and 200.

(Operation example 1)
First, an operation example 1 will be described with reference to FIG. In FIG. 5, the packets are indicated by numbers (corresponding to sequence numbers). Also, for convenience, packets (packets before sequence number assignment) input to the communication device 100 and packets (packets after sequence number deletion) output from the communication device 200 are also indicated by numbers.

  In operation example 1 shown in FIG. 5, each packet input to the communication apparatus 100 and assigned a sequence number is transmitted to all communication networks. That is, as shown in FIG. 5, packets are sequentially input to the communication apparatus 100, and in the order of the input packets, the sequence number assigning unit 120 makes packet 1, packet 2, packet 3, packet 4, packet 5 and so on. Is given a sequence number. The packet distribution processing unit 130 copies the packet 1 and distributes it to the communication network A, the communication network B, and the communication network C. The communication unit 140 transmits packet 1 on the communication network A, transmits packet 1 on the communication network B, and transmits packet 1 on the communication network C. The same operation as that for packet 1 is performed for each of packets 2 to 5.

  The packet 1, the packet 2, the packet 3, the packet 4, and the packet 5 are transmitted to the communication device 200 by the communication network A, the communication network B, and the communication network C, respectively. However, between the time when the packet is transmitted and the time when the packet arrives at the communication device 200, packet loss is caused due to, for example, deterioration of the radio wave condition, and the communication unit 210 of the communication device 200 3 is received, packet 1, packet 2, packet 3 and packet 4 are received from communication network B, and packet 1, packet 3 and packet 5 are received from communication network C.

  The packet order sorting unit 220 of the communication device 200 selects one packet 1 from the received three packets 1, selects one packet 3 from the received three packets 3, packet 1, packet 2, packet 3, The packets are delivered to the output unit 230 in order of the packet 4 and the packet 5, and the output 230 outputs the packet in which the sequence number is deleted in the correct order.

  As in the first operation example, by transmitting the same packet through a plurality of communication networks (here, all communication networks connected with the communication apparatus 100), even if packet loss occurs in some of the communication networks, the remaining packets are left If there is no packet loss in the communication network of (1), the communication apparatus 200 on the receiving side can receive the packet. Generally, in a plurality of communication networks, a communication network of good quality and a communication network of poor quality exist, according to the operation example 1, the communication apparatus 200 on the receiving side transmits all the packets transmitted from the communication apparatus 100 on the transmitting side. There is a high possibility of receiving. In addition, even when a packet loss occurs, the number can be kept small.

(Operation example 2)
Next, an operation example 2 will be described with reference to FIG. In the second operation example, the communication apparatus 100 transmits the same packet through one communication network, but distributes the packets to be received sequentially to a plurality of communication networks to improve the communication speed.

  In the example illustrated in FIG. 6, packets are sequentially input to the communication apparatus 100, and the sequence number assigning unit 120 sequentially inputs the packets in the order of packet 1, packet 2, packet 3, packet 4, and packet 5 in the order of the input packets. A number is assigned. The packet distribution processing unit 130 distributes packet 1 and packet 2 to the communication network A, and distributes packet 3, packet 4 and packet 5 to the communication network C. The communication unit 140 transmits these packets over the corresponding communication network.

  FIG. 6 shows an example in which no packet loss occurs because communication networks A and C with high quality are used.

  In the communication apparatus 200 on the receiving side, the packet 1, the packet 2, and the packet 3, the packet 4, and the packet 5 received from the communication network C by the communication unit 210 are output from the output unit 230 in the correct order. Be done.

  For example, the packet distribution processing unit 130 on the transmission side may distribute packets to communication networks excluding the communication network with the worst quality, or packets may be distributed to a plurality of communication networks whose quality is up to N (N is a natural number) May be distributed.

  Also, for example, the packet distribution processing unit 130 may distribute packets of odd number to the communication network A and may distribute packets of even number to the communication network B. Also, the packet distribution processing unit 130 may distribute the sequence number by the remainder obtained by dividing the number by the number of communication networks. For example, in the example shown in FIG. 6 in which the number of communication networks is 3, the packet distribution processing unit 130 distributes the sequence numbers to communication network A if the remainder after dividing the sequence number by 3 is 0 and the remainder after dividing the sequence number by 3 If 1 is 1, distribution to the communication network B is performed, and if the remainder after dividing the sequence number by 3 is 2, distribution to the communication network C is performed.

  Also, the operation example 1 may be combined. For example, in the example of FIG. 6, when the quality of the communication network C is the best, the packet 3, packet 4, packet 5 are transmitted using the communication network C, and packets are transmitted in the communication network A and the communication network B respectively. 1 and packet 2 may be transmitted.

  In general, the packet transfer rate in the wide area network (mobile phone network, Internet, etc.) is lower than the packet transfer rate in the local area network (network, etc. of the user's home), so the application of the operation example 2 is effective.

  That is, the speed of communication from the communication apparatus 100 to the communication apparatus 200 is significantly lower than the speed of communication from the terminal 300 to the communication apparatus 100 and communication from the communication apparatus 200 to the terminal 400 in the local area network. Communication from the communication device 100 to the communication device 200 may be a bottleneck because of the presence, but by applying the operation example 2, communication from the communication device 100 to the communication device 200 can be sped up and bottlenecked. Can be avoided.

(Operation example 3)
Next, an operation example 3 will be described. Operation example 3 assumes a video transfer application for VR (Virtual Reality), but the application of operation example 3 is not limited to VR.

  The viewing angle of human beings is about 90 degrees in the horizontal direction, but it is the central 40 degrees that is viewed intensively, and the peripheral vision of the eyeball is not even colored. Therefore, in the operation example 3, the direction of the user's line of sight is detected by the sensor in the terminal 300 on the transmission side, and the packet of the video portion corresponding to the central view is transferred through the high quality communication network. Packets are to be transmitted over a communication network that is not of high quality.

  A configuration example of the terminal 300 in this case is shown in FIG. As shown in FIG. 7, the terminal 300 includes a gaze detection unit 310, a camera 320, and a packet transmission unit 330. The line-of-sight detection unit 310 detects the position of the line of sight of the user (for example, a range of a predetermined size of a circular shape that is concentrated and viewed) in the screen range of the video shot by the camera 320 The packet transmission unit 330 is notified of the following information.

  The packet transmission unit 330 packetizes the video captured by the camera 320 by dividing the screen, and acquires the position on the screen corresponding to the packet. Then, for example, the packet transmission unit 330 transmits an identifier (may be referred to as metadata) indicating that to the packet of the video portion corresponding to the position of the line of sight of the user, and transmits the packet to the communication device 100. An identifier is not attached to the packet of the video portion which does not correspond to the position of the user's line of sight.

  In the communication apparatus 100 that receives the above-described packet + identifier or only the packet, the sequence number is added to the packet as described above, and the packet distribution processing unit 130 determines the packet with the identifier. For example, the packet is distributed to the communication network with the highest quality (for example, communication network A), and the packet without an identifier is distributed to communication networks (for example, communication networks B and C) other than the communication network with the highest quality.

  Since the packet to which the identifier is attached is an important packet, the packet distribution processing unit 130 applies the operation example 1 to distribute to both high quality plural communication networks (for example, communication networks A and B). May be

  Since it is assumed that the amount of data (the number of packets) is large for packets to which an identifier is not attached, operation example 2 may be applied to transmit using a plurality of communication networks.

  The communication apparatus 200 on the receiving side transmits the packets received from each communication network to the terminal 400 in the order of the sequence numbers. In the terminal 400, for example, the image of the central view transferred by the high quality communication network and the image of the peripheral view transferred by the low quality communication network are displayed in combination.

  FIG. 8 shows an image of the above process. As shown in FIG. 8, a packet of a boy's image corresponding to the central view portion is transferred by a high quality communication network, and a packet of a peripheral view image is transferred by a low quality communication network. On the receiving side, these are combined and displayed.

  In the example of FIG. 8, for example, if the video of a boy is delivered with high quality, the user satisfaction does not greatly decrease even if noise appears on the video of the river transmitted by the low quality communication network. In addition, since the peripheral visual field is not observed intensively by the user, there is a possibility that the user may not notice noise.

<Example where identifier (metadata) is not used>
On the transmission side, the terminal 300 may not have a function of adding an identifier to the packet. In that case, for example, in the communication apparatus 100 that has received a packet of video from the terminal 300, the packet distribution processing unit 130 performs image recognition using the received packet, and thereby the range of the central portion of the screen of video (example: A packet corresponding to a circle of a predetermined size is identified, and the packet is distributed to a high quality communication network in the same manner as the packet with the above identifier, and other packets are high quality communication network It may be distributed to other communication networks. In addition, the packet distribution processing unit 130 performs image recognition using the received packet, thereby, a packet corresponding to the range of the central part of the screen of the video and a packet not corresponding to the range of the central part of the screen of the video It may be generated and sent as described above.

  Also, the packet distribution processing unit 130 performs image recognition using the received packet, thereby identifying a packet of a portion corresponding to a person in the screen of the video, and the packet is a packet having the above identifier Similarly to the above, the packet may be distributed to a high quality communication network, and the other packets may be distributed to a communication network other than the high quality communication network. In addition, the packet distribution processing unit 130 performs image recognition using the received packet to thereby correspond to a packet of a portion corresponding to a person in the screen of the video and a portion corresponding to a person in the screen of the video. Packets may be generated and the above transmission may be performed.

<Example of sound>
Although operation example 3 shows an example of transmitting a video, the same processing can be applied to the case of transmitting a sound. For example, the terminal 300 collects sounds in an environment where the user speaks, and transmits the collected sound packets to the communication device 100. The packet distribution processing unit 130 of the communication device 100 that has received the packet performs speech recognition using the received packet, whereby a packet of the user's uttered speech and a packet other than that (for example, a packet of an environmental sound) Packets of uttered voice may be separated and distributed to a high quality communication network in the same manner as the packet having the above identifier, and other packets may be distributed to communication networks other than high quality communication networks. That is, the packet distribution processing unit 130 identifies the packet of the voice of the speaker and the packet of the sound other than that, and distributes them to each communication network as described above.

<Others>
Also, in the above-described example, packets of portions considered to be important for video and audio are preferentially transferred to a high quality communication network, but from the viewpoint of selecting a communication network for transmitting packets, It is not limited to

  For example, assuming that the terminal 300 is a walking robot, the terminal 300 (robot) receives various data grasped by its sensor (including a camera, a microphone, etc.) as a packet on the receiving side 400 as a packet (example: steering Transmission to the terminal of the

  In this case, for example, it is set that it is important to send a video necessary for maneuvering with high quality to the terminal 300 (robot), and the terminal 300 (robot) sets the packet of the video detected by the camera. , An identifier indicating that it is important, and transmits it to the communication device 100. The terminal 300 (robot) transmits, to the communication apparatus 100, various packets other than the above-mentioned packets indicating the peripheral status. The communication apparatus 100 that has received the packet transmits the packet to which the identifier has been assigned over the high-quality communication network, and transmits the other packets over the communication network other than the high-quality communication network. As a result, the user of the terminal 400 on the receiving side can quickly grasp the situation and the like in the robot, and can perform appropriate maneuvering.

  Also, for example, when the terminal 300 (robot) meets someone and makes a conversation, priority is given to the sound quality of the conversation, and the communication device 100 transmits the voice packet of the conversation over a high-quality communication network. It is also good. Also, for example, when the terminal 300 (robot) starts a work, the communication device 100 may give priority to tactile information over voice, and the communication device 100 may transmit the packet of the tactile information over a high-quality communication network. .

  Also, for example, it is set that it is important for the terminal 300 (robot) to approach a person, and the distance between the terminal 300 (robot) and the person detected by the sensor has become equal to or less than a predetermined threshold In this case, a packet of data indicating that fact may be transmitted to the communication apparatus 100 with an identifier indicating that it is important. The terminal 300 (robot) transmits, to the communication apparatus 100, various packets other than the above-mentioned packets indicating the peripheral status. The communication apparatus 100 that has received the packet transmits the packet to which the identifier has been assigned over the high-quality communication network, and transmits the other packets over the communication network other than the high-quality communication network. Thereby, the user of the terminal 400 on the receiving side can quickly grasp the situation etc. of the person approaching the robot.

  Also, for example, when the terminal 300 (robot) reads a book and transmits the contents to the receiving side terminal 400, packet transmission is performed by applying the operation example 1 to avoid an error due to a packet loss. It is good to do.

  In addition, in the communication apparatus 100, the packet distribution processing unit 130 may determine which communication network to use to transmit a packet using AI. For example, when AI makes the AI learn in advance the relationship between the frequency, amount, time of transmission, etc. of the received packet and the importance of the packet, and the packet distribution processing unit 130 detects a specific situation by the AI Then, distribute the packet at that time to a high quality communication network.

(Summary of the embodiment)
With the technology according to the present embodiment, for example, it is possible to mitigate the influence of packet loss in real time communication in a wireless environment. For example, by using the radio waves of a plurality of mobile carriers, even if the radio waves of one carrier become extremely weak, it is possible to continue communication with the radio waves of the other carrier. Further, the technology according to the present embodiment can be implemented without updating the infrastructure on the communication network side.

  As described above, according to the present embodiment, packet distributing means for assigning a sequence number to sequentially received packets and distributing each packet with the sequence number to one communication network or a plurality of communication networks, and A communication apparatus is provided, comprising: transmitting means for transmitting each packet distributed to the one communication network or the plurality of communication networks to a receiving side using a communication network of a distribution destination. .

  The packet distribution unit, for example, distributes each packet to which the sequence number is assigned to all the plurality of communication networks to which the communication device is connected.

  The packet distribution unit may select a communication network to which the packet is to be distributed based on the sequence number assigned to the packet.

  The packet distribution unit may distribute a specific packet to a specific communication network among packets to be sequentially received, and distribute packets other than the specific packet to a communication network other than the specific communication network.

  The packet distribution unit may determine that the packet with a predetermined identifier is the specific packet. In addition, when the packet is a video packet, the packet distribution unit determines whether the packet is the specific packet by determining whether the packet corresponds to a specific part in the video. It may be determined whether or not. In addition, when the packet is a sound packet, the packet distribution unit determines whether the packet is the specific packet by determining whether the packet corresponds to the voice of the speaker. You may decide to

  Further, according to the present embodiment, there is provided a communication system comprising the communication device and a receiving communication device for receiving a packet transmitted from the communication device, wherein the receiving communication device is transmitted from the communication device. Receiving means for receiving the received packet from the one communication network or the plurality of communication networks, and outputting means for outputting the packets sequentially received by the receiving means in the order of the sequence numbers attached to the packets A communication system is provided, characterized in that it comprises.

  Although the present embodiment has been described above, the present invention is not limited to such a specific embodiment, and various modifications and changes may be made within the scope of the subject matter of the present invention described in the claims. It is possible.

100 communication device 110 input unit 120 sequence number assigning unit 130 packet distribution processing unit 140 communication unit 200 communication device 210 communication unit 220 packet order sorting unit 230 output unit 300 terminal 310 line of sight detection unit 320 camera 330 packet transmission unit 400 terminal 1000 drive device 1001 recording medium 1002 auxiliary storage device 1003 memory device 1004 CPU
1005 interface device 1006 display device 1007 input device

Claims (10)

Packet distribution means for assigning a sequence number to sequentially received packets and distributing each packet with the sequence number to one communication network or a plurality of communication networks;
A communication device comprising: transmitting means for transmitting each packet distributed to the one communication network or the plurality of communication networks to a receiving side using a communication network of a distribution destination. The communication device according to claim 1, wherein the packet distribution unit distributes each packet to which the sequence number is assigned to all the plurality of communication networks to which the communication device is connected. The communication apparatus according to claim 1, wherein the packet distribution unit selects a communication network to which the packet is to be distributed, based on the sequence number attached to the packet. The packet distribution means distributes a specific packet to a specific communication network among packets sequentially received, and distributes a packet other than the specific packet to a communication network other than the specific communication network. The communication device according to Item 1. 5. The communication apparatus according to claim 4, wherein the packet distribution unit determines that the packet to which a predetermined identifier is attached is the specific packet. When the packet is a video packet, the packet distribution unit determines whether the packet is the specific packet by determining whether the packet corresponds to a specific part in the video. The communication apparatus according to claim 4, wherein: If the packet is a sound packet, the packet distribution unit determines whether the packet is the specific packet by determining whether the packet corresponds to the voice of the speaker. The communication apparatus according to claim 4, wherein the communication apparatus determines. A communication system comprising: the communication device according to any one of claims 1 to 7; and a receiving communication device for receiving a packet transmitted from the communication device,
The receiving communication device is
Receiving means for receiving a packet transmitted from the communication device from the one communication network or the plurality of communication networks;
A communication system, comprising: output means for outputting the packets sequentially received by the receiving means in the order of the sequence numbers attached to the packets. A packet communication method executed by a communication device, comprising
A packet distribution step of assigning a sequence number to sequentially received packets and distributing each packet with the sequence number to one communication network or a plurality of communication networks;
A transmitting step of transmitting each packet distributed to the one communication network or the plurality of communication networks to a receiving side using a communication network of a distribution destination.   The program for functioning a computer as each means in the said communication apparatus of any one of Claim 1 thru | or 7.

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