JP6537102B2 - Communication system and communication method - Google Patents

Description

  The present invention relates to a communication system, a communication method, a communication apparatus, and a communication program, and more particularly to a technology for transmitting data via a plurality of communication paths.

  Patent Document 1 discloses a communication apparatus aiming to enable good data transfer by simultaneously using a plurality of communication paths even if the plurality of communication paths to be used are different types. It is disclosed.

  The communication device has a plurality of wireless communication units each transmitting data. The control unit of the communication apparatus divides data to be transferred into a plurality of blocks and distributes the data to a plurality of wireless communication units. Further, the control unit of the communication apparatus monitors the transmission status of data of the plurality of wireless communication units, and changes the distribution of the distributed blocks according to the transmission status.

JP, 2010-028188, A

  However, the communication device disclosed in Patent Document 1 simply distributes a plurality of blocks obtained by dividing data to be transferred to a plurality of communication paths for transmission. Therefore, there is a problem that when one of the plurality of blocks is missing, it is not possible to reconstruct the original data from the block received by the communication apparatus on the receiving side.

  An object of the present invention is to provide a communication system, a communication method, a communication apparatus, and a communication program, which are resistant to data loss, in order to solve the problems as described above.

  A communication system according to a first aspect of the present invention is a communication system including a transmitting device and a receiving device for receiving a data group transmitted from the transmitting device, the transmitting device including the data group. The receiving apparatus includes: an encoding unit that divides the data group into a plurality of data strings; and a transmitting unit that transmits, to each of a plurality of communication paths, a plurality of data strings obtained by dividing the data group by the encoding unit. A receiving unit for receiving, from each of the plurality of communication paths, a plurality of data strings transmitted by the transmitting unit of the transmitting apparatus; and from each of the plurality of communication paths for the same data string among the plurality of communication paths And a decoding unit that decodes the data group from the plurality of data strings by using any one of the received data strings, the decoding unit being identical among the plurality of communication paths In the data column of There in data string received from each of the plurality of communication paths, is to use the data string received first.

  A communication method according to a second aspect of the present invention is a communication method between a transmitting device and a receiving device that receives a data group transmitted from the transmitting device, the transmitting device including the data group. An encoding step of dividing into a plurality of data strings; a transmitting step of transmitting, to each of a plurality of communication paths, a plurality of data strings obtained by dividing the data group in the encoding step by the transmitting device; And a receiving step of receiving a plurality of data strings transmitted by the transmitting device from each of the plurality of communication paths, and the plurality of communication paths for the same data string among the plurality of communication paths by the receiving device. And a decoding step of decoding the data group from the plurality of data strings by using any one of the data strings received from each of In-up, among the data sequence received from each of the plurality of communication paths for the same data sequence among the plurality of communication paths, it is to use the data string received first.

  A communication apparatus according to a third aspect of the present invention is a communication apparatus for receiving a data group transmitted from a transmitting apparatus, wherein the transmitting apparatus divides the data group and transmits it to each of a plurality of communication paths. Any one of a receiving unit that receives a plurality of data strings from each of the plurality of communication paths, and a data string received from each of the plurality of communication paths for the same data string among the plurality of communication paths And a decoding unit that decodes the data group from the plurality of data strings, and the decoding unit is configured to transmit the plurality of communication paths for the same data string among the plurality of communication paths. Among the data strings received from each, the data string received first is used.

  A communication program according to a fourth aspect of the present invention is a communication program for receiving a data group transmitted from a transmitter, the transmitter dividing the data group into a plurality of communication paths. Any of the reception processing for receiving the plurality of transmitted data strings from each of the plurality of communication paths, and the data sequence received from each of the plurality of communication paths for the same data string among the plurality of communication paths. Using one or the other, causes a computer to execute a decryption process of decrypting the data group from the plurality of data strings, and in the decryption process, the plurality of data strings for the same data string among the plurality of communication paths Among the data strings received from each of the communication paths of (1), the first received data string is used.

  According to each aspect of the present invention described above, it is possible to provide a communication system, a communication method, a communication apparatus, and a communication program that are resistant to data loss.

It is a figure which shows the structure of the communication system which concerns on embodiment. It is a figure which shows the 1st data transmission operation of the communication system which concerns on embodiment. It is a figure which shows the 2nd data transmission operation of the communication system which concerns on embodiment. It is a figure which shows the 3rd data transmission operation of the communication system which concerns on embodiment. It is a figure which shows the 4th data transmission operation of the communication system which concerns on embodiment. It is a figure which shows the 5th data transmission operation of the communication system which concerns on embodiment.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. Specific numerical values and the like shown in the following embodiments are merely examples for facilitating the understanding of the invention, and are not limited thereto unless otherwise specified. Further, in the following description and the drawings, items that are obvious to a person skilled in the art are omitted and simplified as appropriate for clarification of the explanation.

  The configuration of the communication system 1 according to the embodiment of the present invention will be described with reference to FIG. FIG. 1 is a diagram showing the configuration of a communication system 1 according to an embodiment of the present invention.

  As shown in FIG. 1, the communication system 1 includes a transmitting device 10 and a receiving device 20. The transmitting device 10 and the receiving device 20 are connected by a plurality of communication paths 31, 32 to 3 n (n is a natural number of 2 or more).

  Each of the communication paths 31 to 3 n is a communication network configured by arbitrarily using at least one of a landline radio line, a satellite line, and a line such as a carrier line. That is, the types of circuits included in each of the communication paths 31 to 3 n may be the same, or at least two or more may be different from each other. Further, each of the communication paths 31 to 3 n is, for example, an IP (Internet Protocol) network path including general network devices such as a router and a switch.

  The transmitter 10 transmits a data group to the receiver 20 via the plurality of communication paths 31 to 3 n. The receiving device 20 receives the data group transmitted from the transmitting device 10 via the plurality of communication paths 31 to 3 n. Here, the data group is, for example, streaming data (such as audio streaming data or moving image streaming data) for which immediacy is required.

  Here, when transmitting the data group to the receiving device 20, the transmitting device 10 transmits the data group to each of the plurality of communication paths 31 to 3n. That is, the same data group is transmitted to all of the plurality of communication paths 31 to 3 n. Thereby, even if part of the data group is missing in any communication path, it is possible to compensate for the missing data with the data group transmitted in the other communication path, and communication resistant to data loss is possible. And

  The transmission device 10 includes an encoding unit 11 and a transmission unit 12. The encoding unit 11 divides the data group into a plurality of data strings. The transmission unit 12 transmits a plurality of data strings generated by the encoding unit 11 by dividing the data group to each of the plurality of communication paths 31 to 3 n.

  Here, the transmission device 10 has, for example, a CPU (not shown), and the CPU executes a program that causes the CPU to execute processing as the transmission device 10. It cooperates with other hardware to execute processing as the encoding unit 11 and the transmission unit 12.

  The receiving device 20 includes a receiving unit 21, a buffer unit 22, a decoding unit 23, and a monitoring unit 24. The receiver 21 receives the plurality of data strings transmitted by the transmitter 12 of the transmitter 10 from each of the plurality of communication devices 31 to 3 n. The buffer unit 22 stores the plurality of data strings received by the receiving unit 21 by the receiving unit 21. The decoding unit 23 restores the original data group by decoding the plurality of data strings stored in the buffer unit 22. The monitoring unit 24 monitors the reception status of a plurality of data strings in each of the plurality of communication devices 31 to 3 n, and detects a missing data string.

  Here, the receiving device 20 has, for example, a CPU (not shown), and the CPU executes a program that causes the CPU to execute processing as the receiving device 20, so that the receiving device 20 can A cooperative operation is performed with other hardware to execute processing as the receiving unit 21, the decoding unit 23, and the monitoring unit 24. Further, the receiving device 20 has a storage unit capable of storing arbitrary data, and at least a part of the storage unit functions as the buffer unit 22. The storage unit includes, for example, at least one of a storage device such as a hard disk and a memory.

  Subsequently, a first data transmission operation of the communication system 1 according to the embodiment of the present invention will be described with reference to FIG. FIG. 2 shows an example in which three communication paths exist between the transmitter 10 and the receiver 20. An example in which the three communication paths are IP network paths will be described. In FIG. 2, each of the three communication routes is shown as “IP network route A”, “IP network route B”, and “IP network route C”. Further, FIG. 2 shows an example in which the data group 40 is divided into three data strings 51 to 53 and transmitted.

  The encoding unit 11 of the transmission device 10 divides the data group 40 into data strings 51 to 53. The transmitter 12 of the transmitter 10 transmits the data strings 51 to 53 to the IP network paths A to C, respectively. At this time, the transmitting unit 12 attaches a sequence number to each of the data strings 51 to 53 so that the data group can be restored by combining the data strings received by the receiving device 20 in the correct order. Send columns 51-53. More specifically, each of the data strings 51 to 53 is included in separate IP packets together with a sequence number and transmitted. The sequence number is information indicating which data string in the data group is the data string to which the sequence number is assigned.

  Here, in FIG. 2, the data strings 51 to 53 transmitted via the IP network route A are shown as “data string 51 A”, “data string 52 A”, and “data string 53 A”, and the IP network route B is shown. The data strings 51 to 53 transmitted via the IP network route C are shown as “data string 51 B”, “data string 52 B”, and “data string 53 B”, respectively. Are shown as "data string 51C", "data string 52C", and "data string 53C".

  The receiving unit 21 of the receiving device 20 receives the plurality of data strings 51 to 53 transmitted by the transmitting unit 12 of the transmitting device 10 from each of the plurality of IP network paths A to C. That is, the receiving unit 21 receives data strings 51A to 53A from IP network route A, receives data strings 51B to 53B from IP network route B, and receives data strings 51C to 53C from IP network route C. Do. More specifically, the receiving unit 21 receives, for each of the data strings 51A to 53A, 51B to 53B, and 51C to 53C, an IP packet including the data string and its sequence number. The receiving unit 21 sequentially stores the data strings 51A to 53A, 51B to 53B, 51C to 53C in the buffer unit 22 each time it is received.

  The decoding unit 23 of the receiving device 20 stores the data strings 51A to 53A, 51B to 53B stored in the buffer unit 22 based on the sequence numbers assigned to the data strings 51A to 53A, 51B to 53B, 51C to 53C. Data group 40 '(the same data as data group 40) is restored from 51C to 53C.

  The data group 40 'may be restored by using any one of the data strings received from each of the IP network routes A to C, for the same data string among the IP network routes A to C. it can. Therefore, the decoding unit 23 combines any one of the data strings 51A, 51B, 51C, any one of the data strings 52A, 52B, 52C, and any one of the data strings 53A, 53B, 53C. , Restore the data group 40 '.

  Here, the decrypting unit 23 restores the data group 40 ′ using the first received data string for the same data string among the IP network routes A to C. According to this, the part of the data group 40 'that has received the data string can be restored sequentially when the data string is received. Therefore, the immediacy of the data group 40 'can be enhanced, and even if the data group 40' is data such as streaming data that requires immediacy, the request can be satisfied.

  In FIG. 2, for data strings 51A, 51B, 51C, data string 51A is received first, and for data strings 52A, 52B, 52C, data string 52B is received first, for data strings 53A, 53B, 53C. Shows a case where the data string 53C is received first. In this case, as shown in FIG. 2, the decoding unit 23 decodes the data group 40 'using the data string 51A, the data string 52B, and the data string 53C.

  Subsequently, a second data transmission operation of the communication system 1 according to the embodiment of the present invention will be described with reference to FIG. Similarly to FIG. 2, FIG. 3 also shows an example in which three communication paths exist between the transmitter 10 and the receiver 20 and the data group 40 is divided into three data strings 51 to 53 and transmitted. There is. However, FIG. 3 shows a case where some failure occurs in each of the IP network routes A to C during transmission of a data string, and a drop in the data string occurs.

  More specifically, in FIG. 3, in IP network route A, data strings 52A and 53A are missing, in IP network route B, data string 51B is missing, and in IP network route C, data string 52C is missing. The case is shown. Further, in FIG. 3, for the data strings 51A and 51C, the data string 51A is received first, and for the data string 52B, since the received data string is only the data string B, the data string 52B is received first. In the data strings 53B and 53C, the case where the data string 53C is received first is shown.

  Even in this case, as shown in FIG. 3, the decoding unit 23 can decode the data group 40 'using the data string 51, the data string 52B, and the data string 53C. As described above, even when the dropout of the data string occurs on the IP network routes A to C, the receiving device 20 uses the data strings transmitted from the plurality of IP network routes A to C to decode the data group. Data groups can be decoded without problems. That is, according to the present embodiment, it is possible to make the data more robust.

  Subsequently, a third data transmission operation of the communication system 1 according to the embodiment of the present invention will be described with reference to FIG. FIG. 4 shows an example in which two communication paths exist between the transmitting device 10 and the receiving device 20. Further, an example will be described in which the communication bands of the two communication paths are different from each other. That is, an example in which one communication path is a high-speed line and the other communication path is a low-speed line will be described. In FIG. 4, the high speed line is shown as "path D" and the low speed line is shown as "path E". Therefore, the route D is a line faster than the route E. Further, FIG. 4 shows a situation where the data group is divided into ten or more data strings, and the data strings 51 to 60 thereof are transmitted.

  That is, the coding unit 11 of the transmission device 10 divides the data group, and the transmission unit 12 of the transmission device 10 sequentially transmits the data strings 51 to 60 to the paths D and E, respectively. Here, in FIG. 4, the data strings 51 to 60 transmitted via the route D are shown as “data string 51 D” to “data string 60 D”, and the data strings 51 to 60 transmitted via the route E are shown. Are shown as "data string 51E" to "data string 60E".

  In FIG. 4, the data string 51 D, the data string 52 D, and the data string 54 D to data 57 D transmitted via the route D have been received by the receiving device 20, and the data strings 58 D to 60 D are transmitted via the route D. It shows about the situation which is inside. Here, the data string 53D is missing. Further, FIG. 4 shows a situation where the data string 51E to the data 54E have been received by the receiving apparatus 20 via the route E and the data string 55E is being transmitted via the route D.

  That is, the receiving unit 21 of the receiving device 20 has already received the data string 51D, the data string 52D, and the data string 54D to data 57D from the path D, and has stored them in the buffer unit 22. 51E to 54E have been received and stored in the buffer unit 22. The data string received via the path D, which is a high-speed line, is accumulated in the buffer unit 22 more than the data string received via the path E, which is a low-speed line.

  Here, when a predetermined number of data strings received from any of the plurality of paths D and E are stored in the buffer unit 22, the decoding unit 23 of the receiving device 20 starts decoding of the data group. FIG. 4 shows an example of starting decoding of a data group when seven data strings 51 to 57 are accumulated. Therefore, the decoding unit 23 starts decoding the data group when the data strings 51 to 57D are stored in the buffer unit 22 from the route E because the route E is a communication line faster than the route D. Among the data strings transmitted to the route D, the data string 53D is missing, but data strings from the route E can be received up to the data string 54E. Therefore, the decoding unit 23 decodes the data group by complementing the data string 53 using the data string 53E. For example, when the data string 53D is missing on the route D, the decoding unit 23 among the data strings received from the other route E has the same sequence number as the data string 53D (sequence number next to the data string 52D) The data string 53E with "" is used.

  As described above, in the present embodiment, by accumulating the data string up to the predetermined number in the buffer unit 22 and then starting the decoding of the data group, the buffer unit 22 absorbs the difference between the communication bands of the route D and the route E. It is possible to decode data groups even when the data string is missing. That is, the data string can be decoded in accordance with the slowest path E of the communication speed.

  Subsequently, a fourth data transmission operation of the communication system 1 according to the embodiment of the present invention will be described with reference to FIG. Similarly to FIG. 4, FIG. 5 also shows an example in which there are two communication paths between the transmitter 10 and the receiver 20. However, FIG. 5 shows a case where a drop of the data string 53E transmitted to the route E also occurs with respect to the data string 53.

  The monitoring unit 24 of the receiving device 20 monitors the data string stored in the buffer unit 22 and determines whether the same data string is missing on all the routes D and E. In other words, the monitoring unit 24 determines whether or not the same data among all the routes D and E can be received from any of all the routes D and E. More specifically, when the monitoring unit 24 can not receive a data string with the same sequence number from any of all the routes D and D and can not store the data string in the buffer unit 22, all the routes D, It is determined that the same data string is missing in E. If the monitoring unit 24 determines that the same data strings 53D and 53E are missing in all the routes D and E, the monitoring unit 24 requests the transmitting device 10 to retransmit the data string 53. In response to the retransmission request from the receiving device 20, the transmitting unit 12 of the transmitting device 10 retransmits the data string 53 with the highest priority. Then, the decoding unit 23 of the receiving device 10 decodes the data group using the retransmitted data string 53.

  More specifically, for example, the monitoring unit 24 of the receiving device 20 transmits, to the transmitting device 10, retransmission request information including the sequence number of the data string 53 determined to be missing. Note that this retransmission request information may be transmitted via one of the preset paths D and E, or may be transmitted via both. The transmitter 12 of the transmitter 10 retransmits the data string 53 of the sequence number included in the retransmission request information received from the receiver 20. The data string 53 to be retransmitted may be transmitted via one of the paths D and E, or may be transmitted via both. When any one of the communication paths for requesting retransmission is used, the communication path for which retransmission is requested can be set in advance in the receiving apparatus 20 regardless of whether the communication path is high speed or low speed, and the monitoring unit 24 requests retransmission.

  Subsequently, a fifth data transmission operation of the communication system 1 according to the embodiment of the present invention will be described with reference to FIG. Similarly to FIG. 4, FIG. 6 also shows an example in which there are two communication paths between the transmitter 10 and the receiver 20. However, in FIG. 6, the transmission unit 12 of the transmission apparatus 10 thins out and transmits data strings in order to ensure real-time performance.

  Here, the data transmission rate of the transmission unit 12 of the transmission device 10 is Vs, and the decoding rate of the reception device 20 is Vd. Further, it is assumed that the communication speed of the route D is sufficiently larger than Vs (the communication band of the route D is sufficiently wider than Vs). In this case, on the path D, the data string is transmitted without delay. On the other hand, it is assumed that the communication speed of the route E is smaller than Vs (the communication band of the route E is sufficiently narrow relative to Vs). Here, it is assumed that the communication speed of the route E is 0.5 Vs. That is, when the communication speed of the path is equal to or higher than the data transmission speed of the transmission unit 12, the transmission speed of the data string in the path is Vs. On the other hand, when the communication speed of the route is less than the data transmission speed of the transmission unit 12, the transmission speed of the data string in the route is the communication speed of the route.

  In this case, if all data strings are transmitted to the route E as well as the route D, a delay occurs in the transmission of data strings. Therefore, the transmission unit 12 thins out the data string to be transmitted to the path E.

  In other words, when the communication speed of the route E is smaller than that of the route D, the transmission unit 12 thins out the data string to be transmitted to the route E having a small communication speed. For example, as shown in FIG. 6, the transmission unit 12 thins out the even-numbered data strings and transmits data strings 51E, 53E, 55E, 57E,. That is, for example, the data strings are set so that the ratio of the transmission speed of the data strings of the plurality of routes D and E (Vs: 0.5 Vs) becomes the ratio of the number of data strings transmitted to the plurality of routes D and E. The data string to be transmitted to the route E with the lower transmission speed is thinned out.

  Further, the monitoring unit 24 of the receiving device 20 monitors the data string stored in the buffer unit 22 as described in FIG. 5, and the same data string is missing in all the routes D and E. Determine if there is. In FIG. 6, the same data strings 57D and 57E are missing in all the routes D and E. Therefore, the monitoring unit 24 requests the transmitting device 10 to retransmit the data string 53. In response to the retransmission request from the receiving device 20, the transmitting unit 12 of the transmitting device 10 retransmits the data string 57 with top priority.

  As described above, in the example of FIG. 6, the data string is thinned and transmitted on the path E with a slow communication speed. Therefore, as compared with FIG. 5, it is possible to eliminate the deviation of the data string transmitted on the route D having a high communication speed and the route E having a low communication speed, and the data string to be retransmitted due to the missing data string is also early. Can be detected. Therefore, with regard to the data string transmitted on the route E, when the data string received from the route D is missing, it is not necessary to wait until the same data string is received from the route E.

  As to the data string thinned out on the route E (the even-numbered data string in the example of FIG. 6), retransmission is naturally requested when the same data string is missing only on the route D. It will be

  Here, in the communication system 1 described above, the conditions under which the decoding unit 23 of the receiving device 20 starts decoding may be defined as follows. For example, when the decoding speed Vd of the data string in the decoding unit 23 is X [the number of data strings / second], the decoding is started after 2 × or more data strings twice as many as that are accumulated. Assuming that the data transmission rate from the transmission apparatus 10 is Vs in the case of decoding of a data string having immediacy, Vs = Vd. In this case, assuming that the condition for starting decoding is the above condition, X data sequences can be accumulated in buffer unit 22 at all times even during data decoding. Then, the monitoring unit 24 monitors the data string stored in the buffer unit 22.

  In this case, since the number of data strings stored in the buffer unit 22 depends on the decoding speed Vd of the data string, the capacity of the buffer section 22 may also be variable in accordance with the decoding speed Vd of the data strings.

  Also, the programs executed on the transmitting device 10 and the receiving device 20 described above are stored using various types of non-transitory computer readable media, and the computer (transmitting device 10 and It can be supplied to the receiver 20). Non-transitory computer readable media include tangible storage media of various types. Examples of non-transitory computer readable media are magnetic recording media (eg flexible disk, magnetic tape, hard disk drive), magneto-optical recording media (eg magneto-optical disk), CD-ROM (Read Only Memory), CD-R, CD-R / W, semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (Random Access Memory)) are included. Also, the programs may be supplied to the computer by various types of transitory computer readable media. Examples of temporary computer readable media include electrical signals, light signals, and electromagnetic waves. The temporary computer readable medium can provide the program to the computer via a wired communication path such as electric wire and optical fiber, or a wireless communication path.

  The present invention is not limited to the above embodiment, and can be appropriately modified without departing from the scope of the present invention.

  In the above embodiment, an example in which the communication system 1 has only one receiving device 20 has been described, but the communication system 1 may have a plurality of receiving devices 20. In this case, each of the plurality of receiving devices 20 is connected to the transmitting device 10 via a plurality of communication paths.

  In the above embodiment, an example of transmitting data from the transmitting device 10 to the receiving device 20 has been described. However, data may be transmitted from the receiving device 20 to the transmitting device 10 in the same manner. That is, each of the transmitting apparatus 10 and the receiving apparatus 20 may be a communication apparatus including all of the encoding unit 11, the transmitting unit 12, the receiving unit 21, the buffer unit 22, the decoding unit 23, and the monitoring unit 24. .

Reference Signs List 1 communication system 10 transmitting device 11 encoding unit 12 transmitting unit 20 receiving device 21 receiving unit 22 buffer unit 23 decoding unit 24 monitoring unit 31 to 3 n data group to be transmitted IP network path 40 data group to be decoded 51 to 60 data sequence

Claims (5)

A communication system comprising: a transmitting device; and a receiving device for receiving a data group transmitted from the transmitting device,
The transmitting device is
An encoding unit that divides the data group into a plurality of data strings;
A plurality of said data sequence which the coding unit is obtained by dividing the data group has a transmission unit for transmitting to each of the plurality of communication paths,
The receiving device is
A receiving unit for transmitting part of the transmitting device a plurality of said data sequence transmitted, received from each of the plurality of communication paths,
Among the data string received from each of the plurality of communication paths for the same of the data string among the plurality of communication paths, the use of one, the data group from the plurality of said data string And a decoding unit that decodes
The decoding unit of the data sequence received from each of the plurality of communication paths for the same of the data string among the plurality of communication paths, using said data string received first,
The transmission unit has a lower transmission rate of the data string such that the ratio of the transmission rate of the data string in the plurality of communication paths is the proportion of the number of the data strings transmitted to the plurality of communication paths. Thinning out the data string to be sent to the communication path,
Communications system. The receiving apparatus further has a buffer portion in which the data sequence received by the receiving unit are stored,
It said decoding unit, from the data string received from any of said plurality of communication paths is a predetermined number stored in the buffer unit, starts decoding of the data groups,
The communication system according to claim 1. The receiving apparatus further, the same said data string among the plurality of communication paths, to monitor any whether or not to receive from the plurality of communication paths, received from all of the plurality of communication paths And a monitoring unit that requests the transmitting device to retransmit the data string if the data string can not be obtained;
The transmitting unit retransmits the data string requesting retransmission from the monitoring unit of the receiving device,
The communication system according to claim 1 or 2 . The plurality of communication paths include different types of communication lines,
The communication system according to any one of claims 1 to 3 . A communication method between a transmitting device and a receiving device that receives a data group transmitted from the transmitting device,
An encoding step in which the transmitting device divides the data group into a plurality of data strings;
A transmission step wherein the transmitting device, a plurality of said data string by dividing the data group in said encoding step, transmits to each of the plurality of communication paths,
The receiving device, a receiving step in which the transmitting device is a plurality of said data sequence transmitted, received from each of the plurality of communication paths,
The receiving device, among the data string received from each of the plurality of communication paths for the same of the data string among the plurality of communication paths, the use of one, said plurality of said data string Decoding the group of data from
In the decoding step, among the data string received from each of the plurality of communication paths for the same of the data string among the plurality of communication paths, using said data string received first,
In the transmission step, the transmission speed of the data string is lower such that the proportion of the transmission speed of the data string in the plurality of communication paths is the proportion of the number of data strings transmitted to the plurality of communication paths. Thinning out the data string to be sent to the communication path,
Communication method.

Images