JP6205232B2 - Transmitter, receiver - Google Patents

Description

  The present invention relates to a transmission device and a reception device.

  In transmission of next-generation terrestrial digital broadcasting, a transmission device generates a data frame for each layer, places the generated data frame in an OFDM frame, and transmits the data frame to a reception device.

  Here, the data frames for each layer are 8K Super Hi-Vision fixed reception data frames, UHDTV fixed reception data frames, HDTV in-vehicle terminal reception data frames, and Multi-HDTV fixed reception data frames. A data frame, a data frame for reception on an HDTV portable terminal, and the like.

  An FEC (Forward Error Correction) block (error correction block) is arranged in a data frame generated for each layer. FEC blocks arranged in a predetermined number of data frames are managed as an error correction block group (FEC block group).

  FIG. 2 shows the relationship between the OFDM frame 10, the data frame 20, and the FEC block. The OFDM frame 10 and the data frame 20 are synchronized. In addition, the data frame 20 of each layer is composed of one or more FEC blocks.

  A TS (Transport Stream) packet and TLV (Type Length Value) packet, which are information such as video, audio, text, and still images, are arranged in the FEC block.

  A method for generating a data frame from a TS packet and a TLS packet will be described with reference to FIG.

  FIG. 1 is a block diagram showing an interface 1 for generating a data frame. The TLV multiplexing unit 2 generates a TLV packet from the input IP packet.

  The encapsulation unit 3 generates a data frame from the TS packet and TLV packet according to the following procedure.

The TS packet encapsulation unit 3 arranges the TS packet of each layer in the payload of the processing target block that is the target of error correction processing (FEC processing).
The encapsulation unit 3 performs FEC processing on the processing target block in which the TS packet is arranged, and generates an FEC block.
The encapsulation unit 3 places the generated FEC block in the data frame.

In the case of TLV packets and TLV packets, the encapsulation unit 3 arranges the TLV packet of each layer in the payload of the processing target block that is the target of the FEC processing, similarly to the TS packet.
The encapsulation unit 3 performs FEC processing on the processing target block in which the TLV packet is arranged, and generates an FEC block.
The encapsulation unit 3 arranges the FEC block in the data frame.

  The processing target block includes a header 31 and a payload 32, and a data packet 35 (TLV packet or TS packet) is arranged in the payload 32. Here, generating a parity 33 for error correction processing for a data packet placed in the payload and placing it after the payload 32 is called FEC processing. The FEC block is generated by performing FEC processing on the processing target block. The FEC block includes a header 31, a payload 32, and a parity 33. The structure of the FEC block is common to each layer.

  FEC blocks arranged in one or more predetermined number of data frames are managed as an FEC block group. It should be noted that the data frame may not contain an integer number of FEC blocks in each layer, so the boundary between the data frame in each layer and the error correction block does not necessarily match.

  FIG. 3 shows the structure of the FEC block group 30. FIG. 3 shows a configuration in which TLV packets are arranged in the payload 32, but the same configuration is obtained even when TS packets are arranged.

  One FEC block group 30 is provided with either a TS packet or a TLV packet.

  In the FEC block group constituting the predetermined hierarchy, when the amount of information is small, a null packet 34 (null TS packet or null TLV packet) for rate adjustment is arranged.

  In FIG. 3, the number of FEC blocks is 6 and the number of TLV packets is 8, but any number can be set.

  The arrangement method of the TLV packet and the null packet 34 in the FEC block group will be described using FIG. 3 as an example. The TLV packets are arranged as TLV packets # 1 and # 2 in order from the payload 32 of the processing target block # 1 to be subjected to FEC processing. Since the size of the TLV packet # 3 is larger than the size of the remaining part of the payload, the entire TLV packet # 3 cannot be arranged in the processing target block # 1. For this reason, in the conventional arrangement method, the front of the TLV packet # 3 is arranged in the remaining part of the payload of the processing target block # 1, and the payload part of the processing target block # 1 is filled. Further, the remaining part of the TLV packet # 3 is arranged in the subsequent processing target block # 2.

  Similarly, the TLV packets # 4 to # 8 are arranged in the processing target blocks # 2 to # 6, the FEC processing is performed on each processing target block, and the FEC block is generated.

ITU-R BT. 1869

  In the conventional embodiment, as shown in FIG. 4, the data packets are sequentially arranged from the top in the payload 32 of the FEC block group. A null packet 34 for rate adjustment is arranged on the rear side. If the data packet 35 cannot be placed in one FEC block, the data packet 35 is placed in the FEC block and the FEC block subsequent to the FEC block. For example, data packet # 3 is in FEC block # 1 and FEC block # 2, data packet # 7 is in FEC block # 3 and FEC block # 4, and data packet # 8 is in FEC block # 4 and FEC block #. 5 are arranged over 5.

  If the receiving apparatus fails in the decoding process of the FEC block, the receiving apparatus cannot receive the data packet 35 included in the FEC block. When the data packet 35 is arranged across a plurality of FEC blocks, the receiving apparatus cannot receive the data packet 35 arranged across the FEC blocks, and can receive other parts of the data packet 35. Not available. There is a problem that even a part of the received data packet has to be discarded.

  Specifically, if the decoding of the FEC block # 2 fails, the receiving apparatus discards the data packet # 3 arranged in the FEC block # 1 even if the decoding of the FEC block # 1 is successful. turn into.

  Accordingly, the present invention has been made in view of the above-described problems, and provides a transmission device and a reception device configured to improve the performance of decoding processing of information transmitted as the FEC block group 30 for each layer. With the goal.

  A first feature of the present invention is configured to transmit data packets of one or a plurality of layers, and data of a predetermined layer is included in an error correction processing block group composed of a predetermined number of consecutive error correction processing blocks. A transmission device configured to include a packet, a processing target block generation unit configured to generate a processing target block of a predetermined length by arranging a data packet of the predetermined layer in a payload, and the processing target block And an error correction processing unit that generates the error correction processing block by performing an error correction encoding process, the processing target block generation unit arranges the data packet from the beginning of the payload, If a new data packet cannot be placed in the payload, a null packet is placed after the data packet, And summarized in that by satisfying the serial payload is a transmission apparatus characterized by generating the target block.

  The second feature of the present invention is configured to transmit data packets of the same size in one or a plurality of layers, and within an error correction processing block group consisting of a predetermined number of consecutive error correction processing blocks. A transmission device configured to include a data packet of a predetermined layer, and a processing target block generation unit that generates a processing target block of a predetermined length by arranging the data packet of the predetermined layer in a payload; An error correction processing unit that generates the error correction processing block by performing error correction encoding processing on the processing target block, and the processing target block generation unit includes the data packet in the payload. If a new data packet cannot be placed in the payload, a null packet of the same size as the data packet is placed. The first half of the null packet is placed behind the data packet of the payload, the processing target block is generated by filling the payload, and the second half of the null packet follows the processing target block. The gist of the present invention is that the transmission apparatus is arranged from the beginning of the payload of the processing target block.

  A third feature of the present invention is configured to transmit data packets of one or a plurality of layers, and data of a predetermined layer is included in an error correction processing block group including a predetermined number of error correction processing blocks. A transmission device configured to include a packet, wherein a processing target block generation unit that generates a processing target block of a predetermined length by arranging a data packet of the predetermined layer in a payload, and for the processing target block An error correction processing unit that generates the error correction processing block by performing a first error correction coding process, and the processing target block generation unit applies the payload in the error correction processing block group to the payload Parity data is generated by performing a second error correction encoding process on the arranged data packet, and the error correction process And summarized in that a transmission device, characterized in that arranged in the lock group payload.

  According to a fourth aspect of the present invention, data of a predetermined layer is included in an error correction processing block group composed of a predetermined number of error correction processing blocks, which is configured to receive a data packet of one or more layers. An error correction processing block receiving unit configured to receive an error correction processing block generated by arranging a data packet and parity data of the predetermined layer in a payload; and a receiving device configured to include a packet; An error correction processing block detection unit for detecting an error correction processing block that has failed in decoding among the error correction processing blocks received by the error correction processing block reception unit, and a data packet included in the error correction processing block that has failed in decoding The parity data arranged in the payload of the error correction processing block group and the error correction processing block And summarized in that a receiving device having a restoring portion for restoring the data packet included in the error correction processing block successfully disposed click groups payload decoding.

  A fifth feature of the present invention is configured to transmit data packets of one or a plurality of layers, and data of a predetermined layer is included in an error correction processing block group including a predetermined number of consecutive error correction processing blocks. A transmission device configured to include a packet, wherein a processing target block generation unit that generates a processing target block of a predetermined length by arranging a data packet of the predetermined layer in a payload, and for the processing target block An error correction processing unit that generates the error correction processing block by performing the first error correction encoding process, and the processing target block generation unit is arranged in a payload of the error correction processing block group Among the data packets, a second error correction code is added to the data packet arranged across the error correction processing block. By performing the process, generates parity data, and summarized in that a transmission apparatus characterized by disposing the payload of the error correction processing block group.

  A sixth feature of the present invention is configured to receive a data packet of one or a plurality of layers, and data of a predetermined layer in an error correction processing block group composed of a predetermined number of consecutive error correction processing blocks. An error correction processing block receiving unit configured to receive an error correction processing block generated by arranging a data packet and parity data of the predetermined layer in a payload; and a receiving device configured to include a packet; An error correction processing block detection unit for detecting an error correction processing block that has failed in decoding among the error correction processing blocks received by the error correction processing block reception unit, and a data packet included in the error correction processing block that has failed in decoding The parity data arranged in the payload of the error correction processing block group and the error correction processing block A recovery unit that recovers from the data packet included in the error correction processing block that has been successfully decoded by being placed in the payload of the error correction group, and the error correction among the data packets that are arranged in the payload of the error correction block group A summary of the receiving apparatus is that the parity data for error correction processing arranged in a payload of the error correction block group is set for the data packet arranged across blocks. To do.

  A seventh feature of the present invention is configured to transmit data packets of one or a plurality of layers, and data of a predetermined layer is included in an error correction processing block group including a predetermined number of consecutive error correction processing blocks. A transmission device configured to include a packet, a processing target block generation unit that generates an error correction processing block by arranging a data packet in a payload, and an error correction encoding process for the processing target block The error correction processing unit generates the error correction processing block by applying the error correction processing block, and the processing block generation unit includes a predetermined number of data packets of the error correction processing block included in the error correction processing block group. The error is that the data packet is not arranged after the predetermined number of data packets are arranged from the beginning of the payload. The payload of the correction processing block, said replicating at least one of the error correction processing block disposed across data packets, and summarized in that a transmission apparatus characterized by disposing.

  An eighth feature of the present invention is configured to receive data packets of one or a plurality of layers, and data of a predetermined layer is included in an error correction processing block group composed of a predetermined number of consecutive error correction processing blocks. A receiving device configured to include a packet, wherein an error correction processing block reception unit that receives an error correction processing block generated by arranging a data packet in a payload, and the error correction processing block reception unit An error correction processing block detection unit that detects an error correction processing block that has failed in decoding among received error correction processing blocks, and a restoration unit that restores a data packet included in the error correction processing block that has failed in decoding. The error correction processing block group includes a predetermined number of data packets that belong to the error correction processing block group. Arranged from the beginning of the payload of the processing block, after arranging a predetermined number of data packets, the payload of the error correction processing block in which no data packet is arranged, of the data packet arranged across the error correction processing block The at least one is duplicated and arranged as a complementary data packet, and the restoration unit uses the data packet included in the error correction processing block that has been successfully decoded and the error correction that has failed in the decoding using the complementary data packet. The gist of the present invention is a receiving apparatus that restores a data packet included in a processing block.

  As described above, according to the present invention, it is possible to provide a transmission device and a reception device configured to improve the decoding performance of the FEC block group 30 for each layer.

It is a block diagram of the interface which produces | generates a FEC block group. It is a block diagram of an OFDM frame and a data frame. It is a block diagram of the conventional FEC block group. It is a figure showing the subject by the structure of the conventional FEC block group. 1 is a system configuration diagram according to the present invention. It is a block diagram of the transmitter which concerns on this invention. It is a block diagram of the FEC block group which concerns on the 1st Embodiment of this invention. It is a block diagram of the FEC block group which concerns on the 2nd Embodiment of this invention. It is a block diagram of the receiver which concerns on this invention. It is a block diagram of the FEC block group which concerns on the 3rd Embodiment of this invention. It is a block diagram of the FEC block group which concerns on the 3rd Embodiment of this invention.

(First embodiment of the present invention)
A first embodiment of the present invention will be described with reference to FIGS.

  FIG. 5 is a system configuration diagram according to the present embodiment. The transmission device 100 transmits the FEC block group (error correction processing block group) 30 to the reception device 110.

  The transmission apparatus 100 is configured to transmit one or more layers of data packets 35, and includes the data packets 35 of a predetermined layer in the FEC block group 30 including a predetermined number of consecutive FEC blocks. It is configured.

  FIG. 6 is a block diagram of the transmission device 100 according to the present embodiment. The transmission apparatus 100 includes a processing target block generation unit 101 and an FEC processing unit 105. The processing target block generation unit 101 generates a processing target block that is an FEC processing target. The processing target block includes a header 31 and a payload 32. The data packet 35 (TS packet or TLV packet) is input to the processing target block generation unit 101 and placed in the payload 32 portion of the processing target block.

  The processing target block generation unit 101 arranges the data packet from the beginning of the payload 32 of the processing target block, and if a new data packet cannot be arranged in the payload 32, the null packet 34 is placed behind the data packet 35 of the payload 32. Deploy. The processing target block generation unit 101 generates the processing target block by filling the space of the payload 32 using the null packet 34.

  The FEC processing unit 105 performs FEC processing on the processing target block and generates an FEC block group 30.

  A data packet arrangement method according to this embodiment is shown in FIG. The data packet 35 is arranged in order from the top in the payload 32 of the processing target block.

  If the entire data packet cannot be placed in the payload 32, the null packet 34 is placed after the data packet 35 in the payload 32. The processing target block is generated by filling the space of the payload 32 with the null packet 34. After the generation of the processing target block, the data packet 35 is arranged again from the beginning of the payload 32 of the next processing target block.

  By arranging the data packet 35 in this way, the influence of the failure of decoding of the FEC block can be suppressed to the data packet 35 arranged in the FEC block. As a result, it is possible to avoid the problem of “a part of the data packet 35 is discarded despite being successfully decoded”.

  For example, in the conventional arrangement method shown in FIG. 4, when the receiving apparatus 110 fails to decode the FEC block # 2, the data packets # 3 and # 5 are discarded despite being able to be received. However, if the arrangement method according to the first embodiment of the present invention shown in FIG. 7 is used, only the data packet # 3 is affected by the decoding failure of the FEC block # 2, and is arranged in other FEC blocks. It does not affect the data packets being transmitted.

  If the arrangement method according to the first embodiment is used, the decoding performance of the FEC block group can be improved.

  It should be noted that the method of arranging all the data packets 35 so as not to cross the processing target block is effective in suppressing the influence of decoding failure of the processing target block, but the frequency of crossing the processing target block It should be noted that reducing the effect can be sufficiently effective.

(Second embodiment of the present invention)
A second embodiment of the present invention will be described with reference to FIGS. Description of the same parts as those in the first embodiment will be omitted, and parts related to the second embodiment will be described.

  The second embodiment is applied to a TS packet 36 that is a fixed-length data packet.

  FIG. 6 is a block diagram of the transmission device 100 according to the present embodiment. The TS packet 36 is input to the processing target block generation unit 101 and placed in the payload 32 portion of the processing target block.

  The processing target block generator 101 uses the null TS packet 37 having the same size as the TS packet 36 when the TS packet 36 is arranged in the payload 32 and the new TS packet 36 cannot be arranged in the payload 32.

  The generated processing target block is input to the FEC processing unit 105, FEC processing is performed, and an FEC block group is generated as an output.

A method of generating FEC blocks # 1 and # 2 will be described with reference to FIG.
(1) The TS packet # 1 and the TS packet # 2 are arranged from the top of the payload 32 of the processing target block # 1.
(2) Since the entire TS packet # 3 to be placed next cannot be placed, a null TS packet # 1 having the same size as the TS packet is generated, and the portion where TS packet # 1 and TS packet # 2 are not placed Is placed in front of the null TS packet # 1 (null TS packet # 1-1 in FIG. 8).
(3) After the TS packet and the null TS packet are arranged in the payload of the processing target block # 1, FEC processing is performed to generate an FEC block.
(4) For processing target block # 2, the second half of null TS packet # 1 (null TS packet # 1-2 in FIG. 8) is placed at the beginning of payload 32, and TS packet # 3 is placed behind it. .
(5) Since the entire TS packet # 4 cannot be arranged after the TS packet # 3, a null packet is arranged (null TS packet # 2-1 in the figure) as in the generation of the FEC block # 1. After the arrangement of the TS packet and the null TS packet, the FEC process is performed to generate the FEC block # 2.

  In this way, the FEC process is performed on the processing target block in which the TS packet and the null TS packet having the same size are arranged to generate an FEC block. As a result, it is possible to avoid discarding the data packet although it was successfully decoded as shown in FIG.

  If the arrangement method according to the second embodiment is used, the decoding performance of the FEC block group can be improved.

(Third embodiment of the present invention)
A third embodiment of the present invention will be described with reference to FIGS. Description of the same parts as those in the first or second embodiment will be omitted, and parts relating to the third embodiment will be described.

  The transmission apparatus 100 according to the present embodiment will be described with reference to FIG.

  The data packet 35 (TS packet or TLV packet) is input to the processing target block generation unit 101 and placed in the payload 32 of the processing target block.

  The generated processing target block is input to the FEC processing unit 105, FEC processing is performed, and an FEC block group is generated as an output.

  Further, the processing target block generation unit 101 performs AL-FEC (application layer FEC) processing on the data packet 35 arranged in the payload 32 in the FEC block group, and uses an AL-FEC parity used for error correction of the data packet. 38 is generated and arranged in a portion other than the data packet 35 of the payload 32 in the FEC block group.

  The receiving apparatus 110 according to the present embodiment will be described with reference to FIG. The receiving apparatus 110 includes an FEC block receiving unit 111, an FEC block detecting unit 112, and a restoring unit 113.

  The FEC block receiving unit 111 receives the FEC block group 30 including one or more FEC blocks generated by arranging the data packet 35 and the AL-FEC parity 38 in the payload 32.

  The FEC block detection unit 112 detects an FEC block that has failed to be decoded from among the FEC blocks received by the FEC block reception unit 111.

  The restoration unit 113 has successfully decoded the data packet 35 included in the FEC block that has failed to be decoded in the AL-FEC parity 38 arranged in the payload of the FEC block group 30 and the payload 32 in the FEC block group 30. Restoration is performed from the data packet 35 included in the FEC block.

  FIG. 10 shows an arrangement example of the data packet 35 in the present embodiment. After the data packet # 35 is arranged in the payload, AL-FEC parity # 1 and # 2 are arranged.

  The AL-FEC parity 38 is set so as to be applicable to error correction processing of all data packets 35 arranged in the FEC block group 30.

  If the arrangement method according to the third embodiment is used, the decoding performance of the FEC block group can be improved.

  It should be noted that the error correction processing of the present embodiment can be applied even when the AL-FEC parity 38 is not set in all payload 32 portions where the data packet 35 in the FEC block group is not deployed, but is set in a part. It should also be noted.

(Modification of the third embodiment of the present invention)
The third embodiment of the present invention can be modified as follows. In addition, description is abbreviate | omitted about the part same as 3rd Embodiment, and a different part is demonstrated.

  In the embodiment according to this modification, the AL-FEC parity 38 is set so as to be applicable to error correction of the data packet 35 arranged across a plurality of FEC blocks.

  Specifically, AL-FEC (application layer FEC) processing is performed on the data packets # 3, # 5, # 7, and # 8 in FIG. 10, and the AL-FEC parity 38 used for error correction of the data packet is set. It is generated and arranged in a part other than the data packet 35 of the payload 32 in the FEC block group.

  According to this method, when the decoding of the FEC block fails, an error correction processing method having a strong resilience can be provided for the data packet 35 arranged across the FEC block.

  Note that the transmission device 100 and the reception device 110 according to the present embodiment have the same functions as the third embodiment except for the following points.

(Transmitting device 100) The processing target block generation unit 101 applies an AL-FEC (application layer FEC) to the data packet 35 arranged across the FEC blocks among the data packets 35 arranged in the payload 32 in the FEC block group. ) Processing is performed, an AL-FEC parity 38 used for error correction of the data packet is generated, and placed in a portion other than the data packet 35 of the payload 32 in the FEC block group.

(Receiving device 110) The restoration unit 113 receives the data packet 35 arranged across the FEC block among the data packets 35 included in the FEC block that has failed to be decoded, the AL− arranged in the payload of the FEC block group 30. The data is restored from the FEC parity 38 and the data packet 35 arranged in the payload 32 of the FEC block group 30 and successfully decoded.

(Fourth embodiment of the present invention)
A fourth embodiment of the present invention will be described with reference to FIGS. Description of the same parts as those in the first to third embodiments will be omitted, and parts related to the fourth embodiment will be described.

  The transmission apparatus 100 according to the present embodiment will be described with reference to FIG. The data packet 35 (TS packet or TLV packet) is input to the processing target block generation unit 101 and placed in the payload 32 of the processing target block.

  The generated processing target block is input to the FEC processing unit 105, FEC processing is performed, and an FEC block group is generated as an output.

  In addition, the processing target block generation unit 101 duplicates at least one of the data packets 35 arranged across the FEC blocks into the payload 32 of the FEC blocks belonging to the FEC block group in which the data blocks 35 are not arranged, and performs complementary data. It is characterized by being arranged as a packet 39.

  The receiving apparatus 110 according to the present embodiment will be described with reference to FIG.

  The FEC block receiving unit 111 receives the FEC block group 30 including one or more FEC blocks generated by arranging the data packet 35 and the complementary data packet in the payload 32.

  The restoration unit 113 restores the data packet 35 included in the FEC block that has failed in decoding using the data packet 35 and complementary data packet 39 included in the FEC block that has been successfully decoded.

  The data packet arrangement method according to the present embodiment will be described with reference to FIG. The data packet 35 is arranged in order from the top in the payload 32 of the first processing target block to be processed. The arrangement method of the data packet 35 in the payload 32 is the same as the conventional method.

  After the data packet 35 is arranged, at least one of the data packets 35 arranged across the FEC block is copied to the payload 32 where no data packet is arranged, and arranged as a complementary data packet 39.

  Specifically, # 3-2, # 5-2, # 7-2, # 8-2, # 3-1, # 5-1, which is one of the data packets arranged across the FEC block, is duplicated. As a complementary data packet, the data packet 35 is arranged in the payload 32 where the data packet 35 is not arranged.

  There are various methods for selecting a part of the data packet to be copied. For example, when the space in which the complementary data packet 39 can be arranged is small, the smallest one of the data packets 35 arranged across is selected. Alternatively, when the space in which the complementary data packet 39 can be arranged is large, a selection method such as selecting the larger data packet 35 or selecting both the larger data packet and the smaller data packet is possible. is there.

  If the arrangement method according to the fourth embodiment is used, the decoding performance of the FEC block group can be improved.

  As described above, the present invention has been described in detail using the above-described embodiment. However, the number of FEC blocks and the number and type of data packets (TS packets, TLV packets) illustrated in the embodiment are used for explaining the examples. The present invention does not have any restrictive meaning. Further, although the error correction encoding / decoding process has been described by exemplifying FEC and AL-FEC, it is needless to say that the present invention can be applied to other than the correction encoding / decoding process.

  Also, it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

DESCRIPTION OF SYMBOLS 1 ... Interface 2 ... TLV multiplexing part 3 ... Encapsulation part 10 ... OFDM frame 20 ... Data frame 21 ... Hierarchy A
22 ... hierarchy B
23 ... Tier C
30 ... FEC block group 31 ... Header 32 ... Payload 33 ... Parity 34 ... Null packet 35 ... Data packet 37 ... Null TS packet 38 ... AL-FEC parity 39 ... Complementary data packet 100 ... Transmitter 110 ... Receiver 101 ... Processing block generator 105 ... FEC processor 111 ... FEC block receiver 112 ... FEC block detector 113 ... Restoration unit

Claims (3)

It is configured to transmit data packets of the same size of one or a plurality of hierarchies, and includes data packets of a predetermined hierarchy within an error correction processing block group consisting of a predetermined number of consecutive error correction processing blocks. A configured transmission device, comprising:
A processing target block generation unit that generates a processing target block of a predetermined length by arranging the data packet of the predetermined layer in the payload;
An error correction processing unit that generates the error correction processing block by performing an error correction encoding process on the processing target block;
The processing target block generation unit arranges the data packet in the payload and generates a null packet having the same size as the data packet when a new data packet cannot be arranged in the payload. A part is arranged after the data packet of the payload, a processing target block is generated by filling the payload, and a second half part of the null packet is arranged from the beginning of the payload of the processing target block subsequent to the processing target block A transmission apparatus characterized by: It is configured to transmit data packets of one or a plurality of layers, and is configured to include data packets of a predetermined layer in an error correction processing block group consisting of a predetermined number of consecutive error correction processing blocks. A transmitting device,
A processing target block generation unit that generates an error correction processing block by arranging data packets in the payload;
An error correction processing unit that generates the error correction processing block by performing an error correction encoding process on the processing target block;
The processing block generation unit arranges a predetermined number of data packets from the beginning of the payload of the error correction processing block included in the error correction processing block group, arranges the data packet after arranging a predetermined number of data packets A transmitting apparatus, wherein at least one of data packets arranged across the error correction processing block is duplicated and arranged in a payload of the error correction processing block that has not been processed. It is configured to receive a data packet of one or a plurality of layers, and is configured to include a data packet of a predetermined layer in an error correction processing block group consisting of a predetermined number of consecutive error correction processing blocks. A receiving device,
An error correction processing block receiving unit for receiving an error correction processing block generated by arranging data packets in the payload;
An error correction processing block detection unit for detecting an error correction processing block that has failed in decoding among the error correction processing blocks received by the error correction processing block reception unit;
A data packet included in the error correction processing block that has failed in decoding, and a restoration unit that restores the data packet,
The error correction processing block group arranges a predetermined number of data packets from the beginning of the payload of the error correction processing block belonging to the error correction processing block group, and after arranging the predetermined number of data packets, the data packets are arranged Configured to copy at least one of the data packets arranged across the error correction processing block to the payload of the error correction processing block that has not been arranged as a complementary data packet,
The restoration unit restores a data packet included in the error correction processing block that has failed in decoding by using the data packet included in the error correction processing block that has been successfully decoded and the complementary data packet. .

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