JP6579748B2 - Receiving device, receiving method, transmitting device, and transmitting method - Google Patents

Description

  The present technology relates to a receiving device, a receiving method, a transmitting device, and a transmitting method, and in particular, in a channel bonding, a receiving device that can effectively use a frequency band while suppressing an increase in cost on the receiving side. The present invention relates to a reception method, a transmission device, and a transmission method.

  In digital broadcasting, channel bonding (Channel Bonding) is a method in which a stream with a high data rate is divided into a plurality of (channel) divided streams for transmission, and a plurality of divided streams are reconstructed into a stream at the original data rate on the receiving side. )It has been known.

  In the DVB-C2 (Digital Video Broadcasting-Cable second generation) standard, PLP bundling (PLP (Physical Layer Pipe) bundling) is defined as one of channel bonding (see, for example, Non-Patent Document 1). In addition, the use of channel bonding is also expected in the next generation Advanced Television Systems Committee standards (ATSC) standard called ATSC3.0.

DVB-C2: ETSI EN 302 769 V1.2.1 (2011-04)

  By the way, in channel bonding, it is possible to increase the bandwidth of available frequencies by connecting channels for transmitting a plurality of divided streams. It is necessary to provide a separate RF tuner and demodulator for receiving the minute frequency band. Therefore, in channel bonding, there has been a demand for effective use of frequency bands while suppressing an increase in cost on the receiving side.

  The present technology has been made in view of such a situation, and makes it possible to effectively use a frequency band while suppressing an increase in cost on the receiving side in channel bonding.

The receiving device according to the first aspect of the present technology includes a plurality of receiving units that receive a plurality of divided streams obtained by distributing a BB frame of a BB stream that is a BB (BaseBand) frame stream to a plurality of data slices. And a reconstructing unit that reconstructs the original BB stream from the plurality of divided streams based on transmission control information, and the plurality of receiving units are provided in the same number as the plurality of divided streams. And the transmission control information includes a frequency after concatenation including a part of a frequency band between the channels that can be used by connecting the channels when the channels transmitting the divided streams are connected. Each of the divided streams transmitted for each channel including the frequency band after the connection, which has a bandwidth that is greater than the frequency band before the connection, is received for each channel. It includes connecting channel information to be received by the signal unit, the reconstruction unit, when the channel for transmitting the respective divided stream is connected, on the basis of the connection channel information, from the plurality of split streams A receiving apparatus for reconfiguring the original BB stream.

  The receiving device according to the first aspect of the present technology may be an independent device, or may be an internal block constituting one device. The reception method according to the first aspect of the present technology is a reception method corresponding to the reception device according to the first aspect of the present technology described above.

In the reception device and the reception method according to the first aspect of the present technology, when the channels that transmit the respective divided streams are connected, the original BB stream is obtained from the plurality of divided streams based on the connected channel information. Reconfigured.

In the transmission device according to the second aspect of the present technology, channels that transmit each divided stream in a plurality of divided streams obtained by distributing a BB frame of a BB stream that is a BB frame stream to a plurality of data slices are connected. Is a frequency band after concatenation that includes a part of the frequency band between each channel that is made available by concatenating each channel, and the bandwidth is larger than the frequency band before concatenation A generation unit that generates transmission control information including connected channel information for enabling each of the divided streams transmitted for each channel including the connected frequency band to be received according to a configuration of a receiving device; And a transmission unit that transmits the transmission control information together with the plurality of divided streams.

  The transmission device according to the second aspect of the present technology may be an independent device, or may be an internal block constituting one device. A transmission method according to the second aspect of the present technology is a transmission method corresponding to the transmission device according to the second aspect of the present technology described above.

In the transmission device and the transmission method according to the second aspect of the present technology, each divided stream in the plurality of divided streams obtained by distributing the BB frame of the BB stream, which is a BB frame stream, to a plurality of data slices Is a frequency band after connection including a part of the frequency band between the channels that is made available by connecting the channels, and the frequency band before the connection. Generates transmission control information including concatenated channel information to enable each segment stream transmitted for each channel composed of concatenated frequency bands whose bandwidth is greater than that to be received according to the configuration of the receiving device. Then, transmission control information is transmitted together with a plurality of divided streams.

  According to the first aspect and the second aspect of the present technology, in the channel bonding, it is possible to effectively use the frequency band while suppressing an increase in cost on the reception side.

  Note that the effects described here are not necessarily limited, and may be any of the effects described in the present disclosure.

It is a figure showing the composition of the 1 embodiment of the transmission system to which this art is applied. It is a figure explaining general channel bonding. It is a figure explaining the structure of the receiving side in general channel bonding. It is a figure explaining the connection channel bonding of simple expansion. It is a figure explaining the structure of the receiving side in the connection channel bonding of simple extension. It is a figure explaining the connection channel bonding of DVB-C2 standard (J.382 system). It is a figure explaining the structure of the receiving side in the connection channel bonding of DVB-C2 standard (J.382 system). It is a figure explaining the structure of the receiving side at the time of using a broadband tuner in the connection channel bonding of DVB-C2 standard (J.382 system). It is a figure explaining the example 1 of operation corresponding to DVB-C2 standard. It is a figure which shows the data field of the L1 signaling information used in the operation example 1. It is a figure which shows the structural example of a transmitter. 10 is a flowchart for explaining a transmission process corresponding to an operation example 1; 10 is a flowchart for explaining channel bonding transmission processing corresponding to an operation example 1; It is a figure which shows the structural example of a receiver. 10 is a flowchart illustrating a reception process corresponding to Operation Example 1. 10 is a flowchart illustrating channel bonding reception processing corresponding to Operation Example 1; It is a figure explaining the channel bonding of ATSC3.0 standard. It is a figure explaining the normal mode corresponding to the channel bonding of a separate channel. It is a figure which shows the example of arrangement | positioning of L1 signaling information used in the operation example 2. FIG. It is a figure explaining the expansion mode 1 corresponding to channel bonding of a connection 2 channel. It is a figure explaining the expansion mode 2 corresponding to channel bonding of a connection 3 channel. It is a figure explaining the expansion mode 3 corresponding to channel bonding of a connection 4 channel. It is a figure explaining expansion mode 7 corresponding to channel bonding of connection 8 channels. It is a figure which shows the example of bandwidth mode (BANDWIDTH_MODE). 12 is a flowchart for explaining channel bonding transmission processing corresponding to an operation example 2; 10 is a flowchart illustrating channel bonding reception processing corresponding to Operation Example 2. It is a figure which shows the structural example of a computer.

  Hereinafter, embodiments of the present technology will be described with reference to the drawings. The description will be made in the following order.

1. 1. System configuration 2. Overview of channel bonding 3. Description of channel bonding using this technology (1) Operation example 1: Compatible with DVB-C2 standard (2) Operation example 2: Compatible with ATSC 3.0 standard Computer configuration

<1. System configuration>

  FIG. 1 is a diagram illustrating a configuration of an embodiment of a transmission system to which the present technology is applied. A system refers to a logical collection of a plurality of devices.

  In FIG. 1, the transmission system 1 includes a transmission device 10 and a reception device 20.

  The transmission device 10 transmits (transmits) a television program, for example. That is, the transmission device 10 uses, as a digital broadcast signal, a stream of target data to be transmitted such as video data or audio data as a television program, for example, as a transmission line 30 such as a cable television network, a terrestrial wave, or a satellite line. To send (transmit).

  The receiving device 20 receives a digital broadcast signal transmitted from the transmitting device 10 via the transmission path 30, restores the original stream, and outputs the original stream. For example, the receiving device 20 outputs video data and audio data as a television program.

  The transmission system 1 shown in FIG. 1 includes DVB-C2 standard, ATSC3.0 standard compliant digital broadcasting (data transmission), DVB-T2 standard, DVB-S2 standard, ISDB (Integrated Services Digital Broadcasting), etc. It can be applied to digital broadcasting conforming to the standard and other digital broadcasting.

<2. Overview of channel bonding>

(General channel bonding)
FIG. 2 is a diagram for explaining general channel bonding.

  In FIG. 2, in general channel bonding, a divided stream 1 (including a digital broadcast signal (RF1)) divided from one stream by a different channel having a bandwidth of 6 MHz and a digital stream including a divided stream 2 Broadcast signal (RF2)) is being transmitted. However, in each channel, a bandwidth of 5.71 MHz out of a bandwidth of 6 MHz is used for data transmission. The channels used for channel bonding do not need to be adjacent to each other, and can be used as channels for transmitting different digital broadcast signals that are not related to channel bonding.

  Here, when a digital broadcast signal (RF1, RF2) including a divided stream by general channel bonding is transmitted by the transmission device 10, the reception device 20 has a configuration as shown in FIG. 3, for example. Become. That is, the receiving device 20 is provided with an RF tuner unit 212 and a demodulation unit 213 corresponding to the number of channels through which a divided stream divided from one stream is transmitted, and performs processing on a plurality of divided streams. . In FIG. 3, since digital broadcast signals (RF1, RF2) including divided streams are transmitted by two channels, the receiver 20 includes RF tuner units 212-1 and 212-2, a demodulation unit 213- 1 and 213-2 are provided. Note that the RF tuner unit 212 can set a receivable frequency band from frequency bands such as 5 MHz, 6 MHz, 7 MHz, and 8 MHz, for example.

  In the receiving apparatus 20 of FIG. 3, the RF tuner unit 212-1 and the demodulating unit 213-1 perform processing, whereby the divided stream 1 is extracted from the digital broadcast signal (RF1), and the RF tuner unit 212-2 By performing processing by the demodulator 213-2, the divided stream 2 is extracted from the digital broadcast signal (RF2). Then, the combining unit 214 combines the extracted divided stream 1 and the divided stream 2 to restore (reconstruct) the original stream.

(Simple expansion connection channel bonding)
FIG. 4 is a diagram for explaining simple extension connection channel bonding.

  In FIG. 4, in the simple extended connection channel bonding, a divided stream 1 (including a digital broadcast signal (RF1)) divided from one stream and a divided stream 2 (including a digital broadcast signal (RF2)) are adjacent to each other. Is transmitted over a channel consisting of a 6MHz bandwidth. In the adjacent channel, 5.71MHz of the 6MHz bandwidth is used for data transmission, but the bandwidth of the guard band in the connected part of those channels is effective. There is a request to use it.

  Here, in the case where a digital broadcast signal (RF1, RF2) including a divided stream by simple extension concatenated channel bonding is transmitted by the transmission device 10, the reception device 20 has a configuration as shown in FIG. 5, for example. become. That is, in the receiving apparatus 20 of FIG. 5, the divided stream 1 is generated from the digital broadcast signal (RF1) by performing processing by the RF tuner unit 212-1 and the demodulating unit 213-1 as in the configuration of FIG. The divided stream 2 is extracted from the digital broadcast signal (RF2) by being extracted and processed by the RF tuner unit 212-2 and the demodulation unit 213-2. Then, the combining unit 214 combines the extracted divided stream 1 and the divided stream 2 to restore (reconstruct) the original stream.

(DVB-C2 standard (J.382 system) connection channel bonding)
FIG. 6 is a diagram for explaining connection channel bonding of the DVB-C2 standard (J.382 system). The J.382 system is one of the next-generation cable television transmission systems.

  By the way, in the above-described simple extended connection channel bonding, it was stated that there is a request to effectively use the bandwidth of the guard band portion in the connection portion of each channel, but the DVB-C2 standard (J (.382 system) is standardized so that data can be transmitted even in the connected portion of each channel. That is, as shown in FIG. 6, in the DVB-C2 standard (J.382 system) connected channel bonding (connected PLP bundling), data as a divided stream divided from one stream (PLP: Physical Layer Pipe). Slice 0 and data slice 1 (including digital broadcast signals (DS0, DS1)) are transmitted. In each adjacent channel, the 5.71 MHz bandwidth out of the 6 MHz bandwidth is used for data transmission, and the 0.295 MHz bandwidth of the connected portion of these channels is divided from one stream (PLP). A data slice 2 (including a digital broadcast signal (DS2)) as a divided stream is transmitted.

  Here, when a digital broadcast signal (DS0, DS1, DS2) including a data slice based on DVB-C2 standard (J.382 system) connection channel bonding is transmitted by the transmission device 10, the reception device 20 is, for example, It has a configuration as shown in FIG. That is, in the receiving apparatus 20 of FIG. 7, an RF tuner unit 212 and a demodulation unit 213 corresponding to the number of data slices as a divided stream divided from one stream are provided, and processing for a plurality of data slices is performed. become. In FIG. 7, since a digital broadcast signal (DS0, DS1, DS2) including three data slices is transmitted, the receiver 20 includes RF tuner units 212-1, 212-2, 212-3, Demodulating units 213-1, 213-2, and 213-3 are provided.

  In the receiving apparatus 20 of FIG. 7, processing is performed by the RF tuner unit 212-1 and the demodulating unit 213-1 so that the data slice 0 is extracted from the digital broadcast signal (DS0), and the RF tuner unit 212-2. Data slice 1 is extracted from the digital broadcast signal (DS1) by processing by the demodulation unit 213-2, and processing is performed by the RF tuner unit 212-3 and demodulation unit 213-3, so that the digital broadcast signal is processed. Data slice 2 is extracted from (DS2). Then, the combining unit 214 combines the extracted data slice 0, data slice 1, and data slice 2, and restores (reconstructs) the original stream.

  As described above, in DVB-C2 standard (J.382 system) connection channel bonding, the frequency band increased by channel connection (for example, the bandwidth of the connected part of the channel that can be used in channel connection) Although the data slice can be transmitted effectively, the receiving device 20 (FIG. 7) has an RF tuner unit 212 for processing the data slice transmitted with the bandwidth made available by channel connection. -3 and demodulator 213-3 are required. In the DVB-C2 standard (J.382 system), because the frequency band width of the data slice transmitted in each channel is limited, it is transmitted in the bandwidth that can be used in channel connection. This is because the data must be transmitted as another data slice and cannot be processed by the RF tuner unit 212-1 and the demodulation unit 213-1 or the RF tuner unit 212-2 and the demodulation unit 213-2. The maximum value (width) of the data slice is defined in “9.4.1.2 Maximum width of Data Slices” of Non-Patent Document 1 described above.

  As described above, even if the bandwidth that can be used in the channel connection can be used effectively, adding the RF tuner unit 212-3 and the demodulating unit 213-3 to the receiving device 20 Therefore, it is desirable to be able to effectively utilize the bandwidth that can be used in the channel connection while suppressing an increase in cost on the receiving side, since it leads to an increase in cost from the receiving side. In addition, as shown in FIG. 8, it may be possible to provide the receiving apparatus 20 with an RF broadband tuner unit 212 corresponding to a wideband frequency. Eventually, data transmitted with a bandwidth that can be used by channel connection is transmitted. Since it is necessary to provide the demodulator 213-3 for processing the slice, this is not a fundamental solution.

  Therefore, in channel bonding to which the present technology is applied, channel bonding that effectively uses the bandwidth that can be used in channel connection is realized while suppressing an increase in cost on the receiving side. Hereinafter, the channel bonding to which the present technology is applied will be specifically described with reference to an operation example 1 corresponding to the DVB-C2 standard and an operation example 2 corresponding to the ATSC 3.0 standard.

<3. Explanation of channel bonding using this technology>

(1) Operation example 1

(Outline of PLP bundling)
In recent years, there has been a demand for digital broadcasting that transmits high-resolution images of so-called 8K and the like. As a result, the throughput required for transmission of data at a high data rate is about 100 Mbps. PLP corresponding to such high data rate data cannot be transmitted in one data slice.

  Therefore, in the DVB-C2 standard, actual data as one PLP can be divided into BB (BaseBand) frame units and transmitted in multiple data slices by PLP bundling, which is one of channel bonding. Has been standardized. In the receiving device 20, a plurality of data slices transmitted from the transmitting device 10 are received and processed, so that actual data as one PLP is reconfigured.

  In the DVB-C2 standard, a transmission band (frequency band) for transmitting an OFDM (Orthogonal Frequency Division Multiplexing) signal is divided into (about) 6 MHz units, for example. Now, assuming that one transmission band divided into 6 MHz units is referred to as a unit transmission band, the receiving apparatus 20 transmits an OFDM signal of a unit transmission band in which a data slice including a PLP of actual data of a desired television program is transmitted. Is received, and the data slice included in the OFDM signal is processed.

(Summary of Operation Example 1)
FIG. 9 is a diagram for explaining an operation example 1 corresponding to the DVB-C2 standard. In FIG. 9, the frequency band on the left represents a channel or the like subject to PLP bundling corresponding to the current DVB-C2 standard (J.382 system), and the frequency band on the right applied the present technology. Represents the target channel for PLP bundling corresponding to Operation Example 1.

  As shown in the frequency band on the left side of FIG. 9, the connection channel bonding of the current DVB-C2 standard (J.382 system) can be used for channel connection as described above with reference to FIGS. The data slice can be transmitted by effectively utilizing the bandwidth. However, the receiving device 20 includes a demodulator 213-3 (and an RF tuner unit) for processing the data slice 2 (including the digital broadcast signal (DS2)) transmitted with the bandwidth made available through channel connection. Since it is necessary to provide 212-3), the efficiency is good from the transmission side, but the cost is increased from the reception side as described above.

  On the other hand, in Operation Example 1 to which the present technology is applied, it is used for channel connection by removing the restriction on the frequency band width of the data slice transmitted in each channel and making the maximum value (width) changeable. Not only can the available bandwidth be used effectively, but also an increase in cost on the receiving side can be suppressed. In other words, in the current DVB-C2 standard (J.382 system) connected channel bonding (connected PLP bundling), a bandwidth of 5.71 MHz out of a 6 MHz bandwidth is used for data transmission in each channel. Therefore, the bandwidth of 0.295 MHz was further available due to the channel connection, but in the operation example 1 to which the present technology is applied, the maximum value (width) of the data slice can be changed, so that in each channel, Make the 5.86MHz (5.71MHz + 0.15MHz (0.295 / 2MHz)) bandwidth available for data transmission.

  In other words, in Operation Example 1 to which the present technology is applied, the maximum value (width) of the data slice transmitted in each channel can be changed, and the maximum value of data that can be transmitted in each data slice can be set. By doing so, the data transmitted in data slice 2 in the connection channel bonding (FIGS. 6 to 8) of the current DVB-C2 standard (J.382 system) is distributed to data slice 0 and data slice 1. It can be said that it is.

  In Operation Example 1 to which the present technology is applied, in order to cancel the restriction on the width of the frequency band of the data slice transmitted in each channel (by slightly softening), the maximum value (width) can be changed. At least one of the version information and the extended mode is defined. That is, version information for managing the maximum value (width) of a data slice transmitted in each channel is defined. For example, when the version indicated by this version information is updated, the maximum value (width) of the data slice is changed from 3408 (OFDM carriers) to 3496 (OFDM carriers). By releasing the restriction, data transmitted in a frequency band that can be used by channel connection is distributed to data slice 0 and data slice 1.

  Also, an extended mode that indicates whether or not the maximum value (width) of the data slice has been changed is defined. For example, when the extended mode is not set, that is, in the normal mode, the maximum value (width) of the data slice is 3408 (OFDM carriers). On the other hand, when the extended mode is set, the restriction on the maximum value (width) of the data slice (3408 (OFDM carriers)) is released, so that the frequency band that can be used for channel connection is removed. Data to be transmitted is distributed to data slice 0 and data slice 1.

  Here, the version information and the extended mode can be defined in L1 signaling information that is transmission control information including information related to OFDM parameters, data slices, PLPs, notch bands, and the like. That is, the version information and the extended mode can be defined in the L1 signaling information used in the current DVB-C2 standard (J.382 system).

(Structure of L1 signaling information)
FIG. 10 is a diagram illustrating data fields of L1 signaling information used in Operation Example 1.

  The 16-bit NETWORK_ID indicates a network ID that uniquely identifies the current network. The 16-bit C2_SYSTEM_ID indicates a C2 system ID that uniquely identifies a C2 system in the network identified by the network ID.

  24-bit START_FREQUENCY indicates the start frequency of the current C2 system as a distance from 0 Hz, and takes an unsigned int value as an integer multiple of the carrier interval of the current C2 system. 16-bit C2_BANDWIDTH indicates the bandwidth of the current C2 system.

  2-bit GUARD_INTERVAL indicates the guard interval of the current C2 frame. 10-bit C2_FRAME_LENGTH indicates the number of data symbols for each C2 frame. 8-bit L1_PART2_CHANGE_COUNTER indicates the number of C2 frames before the location where the configuration changes.

  8-bit NUM_DSLICE indicates the number of data slices transmitted in the current C2 frame. 4-bit NUM_NOTCH indicates the number of notch bands.

  The following fields are arranged in the data slice loop corresponding to the number of data slices. The 8-bit DSLICE_ID indicates a data slice ID that uniquely identifies the data slice in the C2 system. 13-bit or 14-bit DSLICE_TUNE_POS indicates the tuning position of the data slice as a relative value of START_FREQUENCY.

  8-bit or 9-bit DSLICE_OFFSET_LEFT indicates the start position of the associated data slice as a distance from the tuning position to the left. 8-bit or 9-bit DSLICE_OFFSET_RIGHT indicates the start position of the associated data slice as a distance from the tuning position to the right. When the expansion mode is set as EXTENDED_DS in the reserved area 2 described later, the maximum value (width) of the data slice is set by DSLICE_OFFSET_LEFT and DSLICE_OFFSET_RIGHT.

  2-bit DSLICE_TI_DEPTH indicates the depth of time interleaving within the associated data slice. 1-bit DSLICE_TYPE indicates the type of the associated data slice. When DSLICE_TYPE is “1”, 1-bit FEC_HEADER_TYPE is arranged. FEC_HEADER_TYPE indicates the type of the FEC frame header in the related data slice.

  1-bit DSLICE_CONST_CONF indicates whether the related data slice configuration is variable or fixed. When the value of this field is set to “1”, the configuration of the associated data slice does not change. Otherwise, it is set to “0”.

  1-bit DSLICE_LEFT_NOTCH indicates the presence of an adjacent notch band to the left of the associated data field. When there is a notch band adjacent to the start position of the associated data slice, the value of this field is set to “1”. Otherwise, it is set to “0”.

  8-bit DSLICE_NUM_PLP indicates the number of PLPs transmitted in the associated data slice. The following fields are arranged in the PLP loop corresponding to the number of PLPs. 8-bit PLP_ID indicates a PLP ID for identifying the PLP in the C2 system. 1-bit PLP_BUNDLED is PLP bundle information, and indicates whether or not it is bundled with an associated PLP in the current C2 system. When related PLP is bundled, the value of this field is set to "1". Otherwise, it is set to “0”.

  2-bit PLP_TYPE indicates the type of the related PLP. 5-bit PLP_PAYLOAD_TYPE indicates the type of payload data transmitted by the related PLP. When PLP_TYPE is “00” or “01”, 8-bit PLP_GROUP_ID is arranged. PLP_GROUP_ID indicates a PLP group ID that identifies which PLP group the current PLP is associated with in the C2 system.

  When DSLICE_TYPE is “0”, 14-bit PLP_START, 1-bit PLP_FEC_TYPE, 3-bit PLP_MOD, and 3-bit PLP_COD are arranged. PLP_START indicates the start position of the first complete XFEC frame of the associated PLP in the current C2 frame. PLP_FEC_TYPE indicates the FEC type used in the related PLP. PLP_MOD indicates a modulation scheme used in the related PLP. PLP_COD indicates the coding rate used in the related PLP.

  1-bit PSI / SI_REPROCESSING indicates whether PSI / SI reprocessing is executed. When PSI / SI_REPROCESSING is “0”, 16-bit transport_stream_id and 16-bit original_network_id are arranged. transport_stream_id indicates a transport stream ID that functions as a label for identifying this TS (Transport Stream) from other multiplexing in the distribution system. original_network_id indicates an original network ID that functions as a label for identifying the network ID of the original distribution system.

  Note that 8-bit RESERVED_1 is arranged in the PLP loop. RESERVED_1 is a reserved area 1 reserved for future use. In addition, 8-bit RESERVED_2 is arranged in the data slice loop. RESERVED_2 is reserved area 2 reserved for future use, but 1-bit EXTENDED_DS is placed in this 8-bit RESERVED_2 and the remaining 7 bits are set as reserved area 2. Can be defined. For example, to indicate that there is a change in the maximum value (width) of the data slice, the value of this field is set to “1”. Otherwise, it is set to “0”.

  The following fields are arranged in the notch loop corresponding to the number of notch bands. 13-bit or 14-bit NOTCH_START indicates the start position of the associated notch band as an unsigned int as a relative value of START_FREQUENCY. 8-bit or 9-bit NOTCH_WIDTH indicates the width of the associated notch band as unsigned int. An 8-bit RESERVED_3 is arranged in the notch loop. RESERVED_3 is a reserved area 3 reserved for future use.

  1-bit RESERVED_TONE indicates whether some carriers are reserved. If there is a reserved carrier in the current C2 frame, this bit is set to “1”. Otherwise, it is set to “0”. 16-bit RESERVED_4 is reserved area 4 reserved for future use. By placing 4-bit C2_VERSION in this 16-bit RESERVED_4 and making the remaining 12 bits reserved area 4 Version information can be defined. For example, when the maximum value (width) of the data slice can be changed, the version corresponding to the value of this field is updated.

  Next, when the operation example 1 is adopted, detailed contents of processing executed by the transmission device 10 and the reception device 20 configuring the transmission system 1 will be described. Here, the transmitting side will be described first, and then the receiving side will also be described.

(Configuration of transmitter)
FIG. 11 is a diagram illustrating a configuration example of the transmission device 10 of FIG.

  The transmitter 10 divides the actual data as one PLP (PLP to which the same PLP ID is assigned) by PLP bundling, which is one of channel bonding, and transmits it in a plurality of data slices. It can be done. 11, the transmission apparatus 10 includes a control unit 111, an input processing unit 112, data slice processing units 113-1 to 113-N (N is an integer equal to or greater than 1), a frame configuration unit 114, and a transmission unit 115. Is done.

  The control unit 111 controls the operation of each unit of the transmission device 10.

  Actual data (for example, target data such as TS (Transport Stream)) as PLP having the same PLP ID is supplied to the input processing unit 112. The input processing unit 112 forms a BB frame by adding a BB (BaseBand) header to the actual data supplied thereto. The BB header includes ISCR (Input Stream Time Reference) as ISSY (Input Stream Synchronizer).

  The input processing unit 112 repeatedly distributes each BB frame constituting the BB stream to one data slice among a plurality of data slices, with the BB stream composed of BB frames as an object of division. Thus, the BB stream is divided into a plurality of divided streams in units of BB frames. Further, the input processing unit 112 distributes a plurality of divided streams obtained by dividing the BB stream to any of the data slice processing units 113-1 to 113-N.

  The data slice processing unit 113-1 performs processing on the divided stream distributed by the input processing unit 112. For example, the data slice processing unit 113-1 performs error correction coding on the BB frame constituting the divided frame, and the FEC frame obtained as a result of the error correction coding is in units of a predetermined number of bits as a symbol. Mapping to signal points on a given constellation. Then, the data slice processing unit 113-1 configures a data slice packet by adding a FEC frame header to the FEC frame obtained by extracting the symbol as the mapping result in units of FEC frames. .

  In addition, the data slice processing unit 113-1 configures a data slice from one or more data slice packets, further interleaves in the time direction and the frequency direction, and transmits the interleaved data slice to the frame configuration unit 114. Supply. Further, in the data slice processing units 113-2 to 113-N, similarly to the data slice processing unit 113-1, processing is performed on the divided stream distributed by the input processing unit 112, and the data slice obtained thereby is determined. , And supplied to the frame configuration unit 114.

  The frame configuration unit 114 is supplied with one or more data slices from the data slice processing units 113-1 to 113-N. The frame configuration unit 114 configures a C2 frame including one or more data slices from the data slice processing units 113-1 to 113-N, and supplies the C2 frame to the transmission unit 115. The transmission unit 115 performs IFFT (Inverse Fast Fourier Transform) of the C2 frame supplied from the frame configuration unit 114, and performs DA conversion (Digital to Analog Conversion) on the OFDM signal obtained as a result. Then, the transmission unit 115 modulates an OFDM signal converted from a digital signal to an analog signal into an RF (Radio Frequency) signal, and transmits the modulated signal as a digital broadcast signal via the transmission path 30.

  The control unit 111 includes a channel bonding setting unit 151 and a transmission control information generation unit 152. When the operation example 1 is adopted as the channel bonding (PLP bundling) operation mode, the channel bonding setting unit 151 cancels the restriction on the width of the frequency band of the data slice transmitted in each channel and sets the maximum Information (version information and extended mode) for making the value (width) changeable is set, and the setting content is supplied to the transmission control information generation unit 152.

  The transmission control information generation unit 152 generates transmission control information such as L1 signaling information based on the setting contents supplied from the channel bonding setting unit 151, and supplies the transmission control information to the frame configuration unit 114 and the like. Thereby, for example, the frame configuration unit 114 can add transmission control information such as L1 signaling information when configuring the C2 frame.

  In the configuration of the transmission apparatus 10 in FIG. 11, for convenience of explanation, illustration of blocks not related to channel bonding such as PLP bundling is omitted as appropriate.

(Transmission process)
Next, a flow of transmission processing corresponding to the operation example 1 executed by the transmission device 10 of FIG. 1 will be described with reference to the flowchart of FIG.

  In step S101, the control unit 111 performs channel bonding transmission processing. In this channel bonding transmission process, transmission control information such as L1 signaling information is generated according to the channel bonding (PLP bundling) operation mode (for example, operation example 1). The detailed contents of the channel bonding transmission process will be described later with reference to the flowchart of FIG.

  In step S <b> 102, the input processing unit 112 to the transmission unit 115 perform transmission processing according to control from the control unit 111. In this transmission processing, for example, transmission control information such as L1 signaling information is transmitted as a digital broadcast signal through the transmission path 30 together with a plurality of data slices obtained by dividing one PLP. Note that when the process of step S102 is completed, the transmission process of FIG. 12 ends.

  The transmission process has been described above.

(Channel bonding transmission processing)
Here, with reference to the flowchart of FIG. 13, the detailed content of the channel bonding transmission process corresponding to the operation example 1 in the process of step S101 of FIG. 12 will be described.

  In step S111, it is determined whether the operation mode of channel bonding (PLP bundling) is operation example 1. If it is determined in step S111 that it is operation example 1, the process proceeds to step S112.

  In step S112, the channel bonding setting unit 151 sets version information that permits a change in the maximum value (width) of a data slice that is a target of PLP bundling and an expansion mode. Here, for example, by setting at least one of version information and extended mode information, the restriction on the width of the frequency band of the data slice is released, and the maximum value (width) can be changed.

  In step S113, the transmission control information generation unit 152 generates L1 signaling information based on the setting content of the process in step S112.

  On the other hand, if it is determined in step S111 that it is not operation example 1, the process proceeds to step S114. In step S114, the channel bonding setting unit 151 performs, for example, normal PLP bundling setting processing for transmitting a data slice with a normal maximum value (width) (for example, 3408 (OFDM carriers)). Thereby, L1 signaling information corresponding to normal PLP bundling is generated (S113).

  When the process of step S113 ends, the process returns to the process of step S101 in FIG. 12, and the subsequent processes are executed.

  The channel bonding transmission process corresponding to operation example 1 has been described above.

(Receiver configuration)
FIG. 14 is a diagram illustrating a configuration example of the reception device 20 of FIG.

  The receiving device 20 can reconstruct (restore) actual data transmitted (transmitted) by distributing one PLP to a plurality of data slices by PLP bundling. In FIG. 14, the reception device 20 includes a control unit 211, RF tuner units 212-1 to 212 -N (N is an integer of 1 or more), demodulation units 213-1 to 213 -N (N is an integer of 1 or more), The composition unit 214 is configured.

  The control unit 211 controls the operation of each unit of the receiving device 20.

  The RF tuner unit 212-1 receives an RF signal of a predetermined band transmitted as a digital broadcast signal from the transmission device 10 via the transmission path 30, and supplies the RF signal to the demodulation unit 213-1. The demodulation unit 213-1 demodulates the RF signal from the RF tuner unit 212-1, and performs AD conversion (Analog to Digital Conversion) on the demodulated signal (OFDM signal) obtained as a result. Then, the demodulator 213-1 performs FFT (Fast Fourier Transform) on the demodulated signal converted from the analog signal to the digital signal, and extracts a data slice obtained as a result.

  Further, the demodulator 213-1 decomposes the data slice into data slice packets, and removes the FEC frame header from the data slice packets, thereby decomposing the data slice packets into FEC frames. Based on the removed FEC frame header, the FEC frame modulation scheme, code length, and the like are recognized, and subsequent demapping, error correction decoding, and the like are performed. Then, the demodulator 213-1 performs demapping of the FEC frame (symbol thereof), and decodes the error correction code for the demapped FEC frame, thereby restoring the divided stream composed of the BB frame. To do.

  The demodulated unit 213-1 supplies the divided stream restored from the data slice (the BB frame constituting the divided stream) to a buffer (not shown) provided in the combining unit 214. This buffer is constituted by, for example, a FIFO (First In First Out) memory, and sequentially stores the divided streams (the BB frames constituting the same) supplied from the demodulator 213-1. Further, in the demodulation units 213-2 to 213-N, similarly to the demodulation unit 213-1, the data slices are extracted and divided based on the RF signals supplied from the RF tuner units 212-2 to 212-N. A process for restoring the stream is performed, and the divided streams restored from the data slice (the BB frames constituting the stream) are sequentially stored in a buffer provided in the synthesis unit 214.

  The synthesizing unit 214 generates a BB frame constituting the original BB stream based on ISSY (ISCR) included in the BB header added to the BB frame constituting the plurality of divided streams stored in the buffer provided therein. The BB frames are read from the buffer in the order of arrangement, and the BB frames are rearranged to reconstruct (restore) the original BB stream. The synthesizing unit 214 decomposes the BB frame constituting the original BB stream, restores actual data (for example, target data such as TS), and outputs the restored data.

  The control unit 211 includes a transmission control information acquisition unit 251 and a channel bonding control unit 252. The transmission control information acquisition unit 251 acquires transmission control information such as L1 signaling information obtained by performing channel scanning in the RF tuner unit 212, the demodulation unit 213, and the like, and supplies the transmission control information to the channel bonding control unit 252.

  The channel bonding control unit 252 performs processing related to channel bonding (PLP bundling) such as the demodulation unit 213 and the combining unit 214 based on transmission control information such as L1 signaling information supplied from the transmission control information acquisition unit 251. Control the operation of each part.

(Reception processing)
Next, the flow of reception processing corresponding to the operation example 1 executed by the reception device 20 of FIG. 1 will be described with reference to the flowchart of FIG.

  In step S <b> 201, the RF tuner unit 212 and the demodulation unit 213 perform reception processing according to control from the control unit 211. In this reception process, a digital broadcast signal is received from the transmission device 10 via the transmission path 30, and a process such as a channel scan is performed.

  In step S <b> 202, the demodulation unit 213 and the synthesis unit 214 perform channel bonding reception processing according to control from the control unit 211. In this channel bonding reception processing, processing according to the channel bonding (PLP bundling) operation mode (for example, operation example 1) is performed based on transmission control information such as L1 signaling information, and the like. 1 PLP is reconfigured. Details of the channel bonding reception process will be described later with reference to the flowchart of FIG. When the process of step S202 is completed, the reception process of FIG. 15 ends.

  The reception process has been described above.

(Channel bonding reception processing)
Here, with reference to the flowchart of FIG. 16, the detailed content of the channel bonding reception process corresponding to the operation example 1 in the process of step S202 of FIG. 15 will be described.

  In step S211, the transmission control information acquisition unit 251 acquires L1 signaling information obtained by performing channel scanning in the RF tuner unit 212 and the demodulation unit 213. Here, for example, channel scanning of the entire frequency band is performed, and L1 signaling information is acquired for each channel.

  In step S212, the channel bonding control unit 252 determines, based on the L1 signaling information acquired in step S211 processing, the version information that permits the change of the maximum value (width) of the target data slice for PLP bundling, and the extended mode Determine whether is set.

  If it is determined that the condition of step S212 is satisfied, the process proceeds to step S213. In step S213, the channel bonding control unit 252 controls the demodulation unit 213, the synthesis unit 214, and the like, and performs PLP bundling processing according to the change in the maximum value (width) of the data slice. Here, for example, by setting at least one of the version information and the extended mode information, the restriction on the frequency band width of the data slice is released and the maximum value (width) is changed (for example, 3408 (OFDM carriers) has been changed to 3496 (OFDM carriers)), PLP of data slice 0 and data slice 1 containing data transmitted in the frequency band made available by channel connection is re-started. Will be composed.

  On the other hand, if it is determined that the condition of step S212 is not satisfied, the process proceeds to step S214. In step S214, the channel bonding control unit 252 controls the demodulating unit 213, the combining unit 214, and the like, for example, normal PLP bundling for a data slice having a normal maximum value (width) (for example, 3408 (OFDM carriers)). Perform processing.

  When the process of step S213 or step S214 ends, the process returns to the process of step S202 in FIG. 15, and the subsequent processes are executed.

  The channel bonding reception process corresponding to operation example 1 has been described above.

  As described above, in Operation Example 1 corresponding to the DVB-C2 standard, by defining version information (C2_VERSION) and extended mode (EXTENDED_DS) as concatenated channel information, the frequency of the data slice transmitted in each channel The restriction on the bandwidth is released (slightly softened), and the maximum value (width) can be changed. As a result, since it is possible to transmit data in the frequency band that can be used in channel connection without separately providing the RF tuner unit 212, the demodulation unit 213, and the like in the receiving device 20, the cost of the receiving device 20 is reduced. The frequency band can be effectively utilized while suppressing the increase.

(2) Operation example 2

(Overview of ATSC 3.0 standard channel bonding)
FIG. 17 is a diagram for explaining channel bonding of the ATSC 3.0 standard.

  Channel bonding is expected to be adopted in the ATSC 3.0 standard currently being developed. Even in the ATSC 3.0 standard channel bonding, the actual data as one PLP can be divided into BB frame units and transmitted in a plurality of data slices. In the receiving device 20, a plurality of data slices transmitted from the transmitting device 10 are received and processed, so that actual data as one PLP is reconfigured.

  In FIG. 17, in the channel bonding of the ATSC 3.0 standard, data slice 0 (including digital broadcast signal (DS0)) divided from one PLP (PLP1) by different channels having a bandwidth of 6 MHz and data slice 1 (including digital broadcast signal (DS1)) is transmitted. However, in each channel, a bandwidth of 5.71 MHz out of a bandwidth of 6 MHz is used for data transmission. The channels used for channel bonding do not need to be adjacent to each other, and can be used as channels for transmitting different digital broadcast signals that are not related to channel bonding. In FIG. 17, a digital broadcast signal corresponding to the current ATSC 1.0 standard is transmitted through three channels between channels through which data slices are transmitted.

  Here, when a digital broadcast signal (DS0, DS1) including a plurality of data slices is transmitted by the transmission device 10, the reception device 20 transmits data slices divided from one PLP (PLP1). An RF tuner unit 212 and a demodulating unit 213 corresponding to the number of channels are provided to perform processing on a plurality of data slices. In FIG. 17, data slice 0 (including digital broadcast signal (DS0)) and data slice 1 (including digital broadcast signal (DS1)) are transmitted through two channels. RF tuner units 212-1 and 212-2 and demodulation units 213-1 and 213-2 are provided. Note that the RF tuner unit 212 can set a receivable frequency band from frequency bands such as 5 MHz, 6 MHz, 7 MHz, and 8 MHz, for example.

  In the receiving apparatus 20, processing is performed by the RF tuner unit 212-1 and the demodulation unit 213-1, whereby the data slice 0 is extracted from the digital broadcast signal (DS0), and the RF tuner unit 212-2 and the demodulation unit 213 are extracted. -2 is extracted, the data slice 1 is extracted from the digital broadcast signal (DS1). Then, the combining unit 214 combines the extracted data slice 0 and data slice 1 to restore (reconfigure) the original PLP (PLP1).

  Also, as shown in FIG. 18, data slice 0 (including digital broadcast signal (DS0)) divided from one PLP (PLP1) and data slice 1 (including digital broadcast signal (DS1)) are adjacent to each other. May be transmitted over a channel with a 6 MHz bandwidth. In this case, although the bandwidth of 5.71 MHz is used for data transmission in adjacent channels, the bandwidth of the connected portion of these channels is not effectively used. Therefore, in the ATSC 3.0 standard, as in the case of the DVB-C2 standard (J.382 system) described above, the channels for transmitting data slices are connected and the frequency band increased by the channel connection (for example, There is a demand to effectively use the frequency band that can be used in channel connection without providing the RF tuner unit 212 and the demodulation unit 213 for processing data slices transmitted in the bandwidth of the channel connection portion). is there.

  Therefore, in Operation Example 2 to which the present technology is applied, a bandwidth mode (BANDWIDTH_MODE) is defined, and an RF tuner unit 212 or a demodulator for processing a data slice transmitted in a frequency band that can be used in channel connection. Without providing the unit 213, the frequency band increased by the channel connection can be used effectively. That is, in Operation Example 2 to which the present technology is applied, the receiving device 20 does not have a fixed value for the frequency band width of the data slice transmitted in each channel, and the reception device 20 has the configuration of the RF tuner unit 212, the demodulation unit 213, and the like. By operating in the bandwidth mode (BANDWIDTH_MODE) corresponding to the bandwidth, it becomes possible to effectively utilize the bandwidth that has become available in the channel connection.

  Here, the bandwidth mode (BANDWIDTH_MODE) can be defined in, for example, L1 signaling information that is transmission control information. As shown in FIG. 19, the physical layer frame ((ATSC Physical) Frame) of Layer 1 is composed of a preamble (Preamble) and data (Data (Payload)). For example, the bandwidth mode can be defined by arranging 3-bit BANDWIDTH_MODE in the L1 signaling information arranged in the preamble.

  Here, as in the case of operation example 1 described above, the width of the frequency band of the data slice transmitted in each channel may be set. In the end, since the number of data slices that can be supported changes depending on the configuration of the RF tuner unit 212, the demodulation unit 213, and the like in the receiving device 20, the bandwidth mode (BANDWIDTH_MODE) is changed to transmission control information such as L1 signaling information. In addition, the transmission device 10 may not transmit to the reception device 20. That is, the receiving apparatus 20 may determine a bandwidth mode (BANDWIDTH_MODE) corresponding to the configuration of the RF tuner unit 212, the demodulation unit 213, and the like, and operate in the bandwidth mode.

  As the bandwidth mode (BANDWIDTH_MODE), the normal mode (regular mode) in which the channels for transmitting the plurality of data slices shown in FIGS. 17 and 18 are not connected, and the channel for transmitting the plurality of data slices are provided. There is a concatenated extended mode. As this extended mode, a plurality of extended modes can be set according to the number of channels to be connected. Therefore, the extended mode according to the number of connected channels will be described below.

(Extended mode 1)
FIG. 20 is a diagram for explaining the expansion mode 1 corresponding to channel bonding of two connected channels.

  In FIG. 20, the receiving device 20 is provided with RF tuner units 212-1 and 212-2 and demodulation units 213-1 and 213-2. In this case, the reception device 20 receives the data slice 0 (including the digital broadcast signal (DS0)) and the data slice 1 (including the digital broadcast signal (DS1)) transmitted from the transmission device 10 through two channels. It becomes possible.

  When two channels are concatenated, the frequency band increased by the concatenated two channels can be used, so that the extension mode 1 (BANDWIDTH_MODE = "1") is set, so that the adjacent channel is 5.86 MHz. Bandwidth is used for data transmission. In other words, in the case of the normal mode (11.42 MHz (2 x 5.71 MHz)), the bandwidth of 11.72 MHz (2 x 5.86 MHz) will be used for data transmission in the concatenated two channels consisting of a bandwidth of 12 MHz. As compared with the above, it is possible to effectively utilize the frequency band increased by the connected two channels.

  In the receiving device 20, processing is performed by the RF tuner unit 212-1 and the demodulating unit 213-1 so that the data slice 0 is extracted from the digital broadcast signal (DS0) and demodulated with the RF tuner unit 212-2. By performing the processing by the unit 213-2, the data slice 1 is extracted from the digital broadcast signal (DS1). In this case, since the extension mode 1 is set in the receiving device 20, for example, an RF tuner unit 212-3 and a demodulating unit 213-3 are provided to cope with the frequency band increased by the connected two channels. Therefore, it is possible to process data corresponding to the increased frequency band in the connected two channels.

(Extended mode 2)
FIG. 21 is a diagram for explaining an expansion mode 2 corresponding to channel bonding of three connected channels.

  In FIG. 21, the receiving apparatus 20 is provided with RF tuner units 212-1 to 212-3 and demodulation units 213-1 to 213-3. In this case, the receiving device 20 transmits data slice 0 (including a digital broadcast signal (DS0)), data slice 1 (including a digital broadcast signal (DS1)), which are transmitted from the transmitting device 10 through three channels. Data slice 2 (including digital broadcast signal (DS2)) can be received.

  When three channels are connected, the extended frequency band (BANDWIDTH_MODE = "2") is set in order to use the frequency band increased by the connected three channels. Ensure that bandwidth is used for data transmission. In other words, in the case of normal mode (17.13 MHz (3 x 5.71 MHz)), the bandwidth of 17.70 MHz (3 x 5.90 MHz) will be used for data transmission on 3 connected channels with a bandwidth of 18 MHz. As compared with the above, it is possible to effectively use the frequency band corresponding to the increase in the connected three channels.

  In the receiving device 20, processing is performed by the RF tuner unit 212-1 and the demodulating unit 213-1 so that the data slice 0 is extracted from the digital broadcast signal (DS0) and demodulated with the RF tuner unit 212-2. The data slice 1 is extracted from the digital broadcast signal (DS1) by the processing by the unit 213-2, and the digital broadcast signal (DS1) is processed by the RF tuner unit 212-3 and the demodulation unit 213-3. Data slice 2 is extracted from DS2). In this case, since the extension mode 2 is set in the receiving device 20, for example, an RF tuner unit 212-4 and a demodulating unit 213-4 are provided to cope with the frequency band corresponding to the increase in the connected three channels. Therefore, it is possible to process data corresponding to the frequency band corresponding to the increase in the connected three channels.

(Extended mode 3)
FIG. 22 is a diagram for explaining the extension mode 3 corresponding to the channel bonding of four connected channels.

  In FIG. 22, the receiving apparatus 20 is provided with RF tuner units 212-1 to 212-4 and demodulation units 213-1 to 213-4. In this case, the receiving device 20 transmits data slice 0 (including a digital broadcast signal (DS0)), data slice 1 (including a digital broadcast signal (DS1)) transmitted from the transmitting device 10 through four channels, Data slice 2 (including digital broadcast signal (DS2)) and data slice 3 (including digital broadcast signal (DS3)) can be received.

  When four channels are concatenated, in order to be able to use the frequency band increased by the concatenated four channels, the extension mode 3 (BANDWIDTH_MODE = "3") is set. Ensure that bandwidth is used for data transmission. That is, in the case of normal mode (22.84 MHz (4 x 5.71 MHz)), the bandwidth of 23.72 MHz (4 x 5.93 MHz) will be used for data transmission in 4 connected channels with a bandwidth of 24 MHz. As compared with the above, it is possible to effectively utilize the frequency band increased by the four connected channels.

  In the receiving device 20, the data slice 0 is extracted from the digital broadcast signal (DS0) by the RF tuner unit 212-1 and the demodulation unit 213-1, and the digital broadcast is performed by the RF tuner unit 212-2 and the demodulation unit 213-2. The data slice 1 is extracted from the signal (DS1), the data slice 2 is extracted from the digital broadcast signal (DS2) by the RF tuner unit 212-3 and the demodulation unit 213-3, and the RF tuner unit 212-4 and the demodulation unit 213- 4, the data slice 3 is extracted from the digital broadcast signal (DS3). In this case, since the extended mode 3 is set in the receiving device 20, for example, an RF tuner unit 212-5 and a demodulating unit 213-5 are provided to cope with the frequency band corresponding to the increase in the connected four channels. Therefore, it is possible to process data corresponding to the frequency band corresponding to the increase in the connected four channels.

(Extended mode 7)
FIG. 23 is a diagram for explaining an expansion mode 7 corresponding to channel bonding of 8 connected channels.

  In the extended mode 4 to the extended mode 7, the number of data slices that can be handled is increased by increasing the number of the RF tuner unit 212 and the demodulating unit 213 provided in the receiving device 20 from 5 to 8 sets. This is basically the same as the extended mode 1 to extended mode 3 described above, and therefore, the extended mode 7 will be described as a representative here.

  In FIG. 23, the receiving device 20 is provided with RF tuner units 212-1 to 212-8 and demodulation units 213-1 to 213-8. In this case, the receiving device 20 can receive the data slice 0 (including the digital broadcast signal (DS0)) to the data slice 7 (including the digital broadcast signal (DS7)) transmitted from the transmitting device 10 through eight channels. It becomes.

  When 8 channels are concatenated, in order to make the frequency band increased by the concatenated 8 channels available, the extended mode 7 (BANDWIDTH_MODE = "7") is set, so that each channel has 5.96MHz. Ensure that bandwidth is used for data transmission. In other words, in the case of the normal mode (45.68MHz (8x5.71MHz)), the bandwidth of 47.68MHz (8x5.96MHz) will be used for data transmission in the concatenated 8 channels with 48MHz bandwidth. As compared with the above, it is possible to effectively utilize the frequency band increased by the connected eight channels.

  In the receiving device 20, the data slice 0 is extracted from the digital broadcast signal (DS0) by the RF tuner unit 212-1 and the demodulation unit 213-1, and the digital broadcast is performed by the RF tuner unit 212-2 and the demodulation unit 213-2. The data slice 1 is extracted from the signal (DS1), the data slice 2 is extracted from the digital broadcast signal (DS2) by the RF tuner unit 212-3 and the demodulation unit 213-3, and the RF tuner unit 212-4 and the demodulation unit 213- 4 extracts the data slice 3 from the digital broadcast signal (DS3).

  In the receiving apparatus 20, the data slice 4 is extracted from the digital broadcast signal (DS4) by the RF tuner unit 212-5 and the demodulation unit 213-5, and the digital broadcast is performed by the RF tuner unit 212-6 and the demodulation unit 213-6. The data slice 5 is extracted from the signal (DS5), the data slice 6 is extracted from the digital broadcast signal (DS6) by the RF tuner unit 212-7 and the demodulation unit 213-7, and the RF tuner unit 212-8 and the demodulation unit 213- 8 extracts the data slice 7 from the digital broadcast signal (DS7).

  In this case, since the extended mode 7 is set in the receiving device 20, for example, an RF tuner unit 212-9 and a demodulating unit 213-9 are provided to cope with the frequency band corresponding to the increase in the connected eight channels. Therefore, it is possible to process data corresponding to the frequency band corresponding to the increase in the connected eight channels.

  As described above, the bandwidth mode (BANDWIDTH_MODE) is set according to the configuration of the receiving apparatus 20 (the number of sets of the RF tuner unit 212 and the demodulation unit 213). When the frequency band of each channel exceeds 6 MHz, For example, since it is necessary to use the RF tuner unit 212 corresponding to the frequency band of 7 MHz, in this example, the extension mode 1 to the extension mode 7 are defined as the extension modes of the bandwidth mode (BANDWIDTH_MODE), and the maximum number of connected 8 It corresponds to the channel. FIG. 24 summarizes the bandwidth mode (BANDWIDTH_MODE) described above.

  Note that the bandwidth mode (BANDWIDTH_MODE) may be transmitted together with the data slice by transmission control information such as L1 signaling information, or the receiving device 20 has a configuration such as the RF tuner unit 212 and the demodulation unit 213. Accordingly, the bandwidth mode may be determined and the operation may be performed in the bandwidth mode. In operation example 2, as in the case of operation example 1 described above, not only the bandwidth mode (BANDWIDTH_MODE) but also processing corresponding to the frequency band corresponding to the increased channel connection is managed using version information. You may be made to do.

  Next, when the operation example 2 is adopted, detailed contents of processing executed by the transmission device 10 and the reception device 20 configuring the transmission system 1 will be described. In addition, since the configurations of the transmission device 10 and the reception device 20 in the operation example 2 are the same as those in the operation example 1 described above, description thereof is omitted.

(Transmission process)
First, the flow of transmission processing corresponding to Operation Example 2 executed by the transmission apparatus 10 will be described. The transmission process corresponding to operation example 2 differs from the transmission process corresponding to operation example 1 in FIG. 12 in the content of the channel bonding transmission process in step S101. A channel bonding transmission process corresponding to operation example 2 will be described with reference to the flowchart of FIG.

(Channel bonding transmission processing)
FIG. 25 is a flowchart illustrating channel bonding transmission processing corresponding to operation example 2.

  In step S131, it is determined whether or not the channel bonding operation mode is operation example 2 (expansion mode). If it is determined in step S131 that the operation example 2 is (extended mode), the process proceeds to step S132.

  In step S132, the channel bonding setting unit 151 sets a bandwidth mode (BANDWIDTH_MODE) corresponding to the number of connected channels in channel bonding. Here, for example, the extended mode 1 (BANDWIDTH_MODE = “1”) is set in the case of connected 2 channels, and the extended mode 2 (BANDWIDTH_MODE = “2”) is set in the case of connected 3 channels.

  In step S133, the transmission control information generation unit 152 generates L1 signaling information based on the setting content of the process in step S132.

  On the other hand, if it is determined in step S131 that the operation example 2 is not (extended mode), the process proceeds to step S134. In step S134, the channel bonding setting unit 151 performs, for example, normal channel bonding setting processing for transmitting a data slice in the normal mode (BANDWIDTH_MODE = “0”) as the bandwidth mode (BANDWIDTH_MODE). Thereby, L1 signaling information corresponding to normal channel bonding is generated (S133).

  When the process of step S133 ends, the process returns to the process of step S101 of FIG. 12, and the subsequent processes are executed.

  The channel bonding transmission process corresponding to operation example 2 has been described above.

(Reception processing)
Next, the flow of reception processing corresponding to operation example 2 executed by the reception device 20 will be described. The reception process corresponding to operation example 2 differs from the reception process corresponding to operation example 1 in FIG. 15 in the content of the channel bonding reception process in step S202. A PLP bundling reception process corresponding to operation example 2 will be described with reference to the flowchart of FIG.

(Channel bonding reception processing)
FIG. 26 is a flowchart illustrating channel bonding reception processing corresponding to operation example 2.

  In step S231, the transmission control information acquisition unit 251 acquires L1 signaling information obtained by performing channel scanning in the RF tuner unit 212 and the demodulation unit 213. Here, for example, channel scanning of the entire frequency band is performed, and L1 signaling information is acquired for each channel.

  In step S232, the channel bonding control unit 252 sets a bandwidth mode (BANDWIDTH_MODE) (as an extended mode) according to the number of connected channels in channel bonding based on the L1 signaling information acquired in the process of step S231. Determine whether or not.

  If it is determined in step S232 that the bandwidth mode (as an extension mode) corresponding to the number of connected channels is set, the process proceeds to step S233. In step S233, the channel bonding control unit 252 controls the demodulation unit 213, the combining unit 214, and the like, and performs channel bonding processing according to the number of connected channels in accordance with the bandwidth mode (BANDWIDTH_MODE).

  Here, for example, when the receiving apparatus 20 includes the RF tuner units 212-1 and 212-2 and the demodulation units 213-1 and 213-2, the extended mode 1 (BANDWIDTH_MODE = “1”) is set. At this time, in each channel of the connected two channels, a bandwidth of 5.86 MHz is used for data transmission, and the PLP (PLP1) of 1 is reconfigured from the data slice 0 and the data slice 1. For example, when the reception apparatus 20 includes the RF tuner units 212-1 to 212-3 and the demodulation units 213-1 to 213-3, the extended mode 2 (BANDWIDTH_MODE = “2”) is set. In each of the three connected channels, a bandwidth of 5.90 MHz is used for data transmission, and one PLP (PLP1) is reconfigured from data slices 0 to 2.

  On the other hand, if it is determined in step S232 that the bandwidth mode (as an extension mode) corresponding to the number of connected channels is not set, the process proceeds to step S234. In this case, the normal mode (BANDWIDTH_MODE = “0”) is set as the bandwidth mode (BANDWIDTH_MODE). In step S234, the channel bonding control unit 252 controls the demodulating unit 213, the combining unit 214, and the like, and performs normal channel bonding processing on data slices transmitted on different channels.

  When the process of step S233 or step S234 ends, the process returns to the process of step S202 of FIG. 15, and the subsequent processes are executed.

  The channel bonding reception process corresponding to operation example 2 has been described above.

  As described above, in the operation example 2 corresponding to the ATSC 3.0 standard, by defining the bandwidth mode (BANDWIDTH_MODE) as the connected channel information, the configuration of the reception device 20 (the combination of the RF tuner unit 212 and the demodulation unit 213). The data can be transmitted in the frequency band determined according to the number of connected channels and made available according to the number of connected channels. As a result, since it is possible to transmit data in the frequency band that can be used in channel connection without separately providing the RF tuner unit 212, the demodulation unit 213, and the like in the receiving device 20, the cost of the receiving device 20 is reduced. The frequency band can be effectively utilized while suppressing the increase.

<4. Computer configuration>

  The series of processes described above can be executed by hardware or can be executed by software. When a series of processing is executed by software, a program constituting the software is installed in the computer. FIG. 27 is a diagram illustrating a configuration example of hardware of a computer that executes the above-described series of processing by a program.

  In the computer 900, a CPU (Central Processing Unit) 901, a ROM (Read Only Memory) 902, and a RAM (Random Access Memory) 903 are connected to each other by a bus 904. An input / output interface 905 is further connected to the bus 904. An input unit 906, an output unit 907, a recording unit 908, a communication unit 909, and a drive 910 are connected to the input / output interface 905.

  The input unit 906 includes a keyboard, a mouse, a microphone, and the like. The output unit 907 includes a display, a speaker, and the like. The recording unit 908 includes a hard disk, a nonvolatile memory, and the like. The communication unit 909 includes a network interface or the like. The drive 910 drives a removable medium 911 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory.

  In the computer 900 configured as described above, the CPU 901 loads the program stored in the ROM 902 or the recording unit 908 to the RAM 903 via the input / output interface 905 and the bus 904 and executes the program. A series of processing is performed.

  The program executed by the computer 900 (CPU 901) can be provided by being recorded on a removable medium 911 as a package medium, for example. The program can be provided via a wired or wireless transmission medium such as a local area network, the Internet, or digital satellite broadcasting.

  In the computer 900, the program can be installed in the recording unit 908 via the input / output interface 905 by attaching the removable medium 911 to the drive 910. Further, the program can be received by the communication unit 909 via a wired or wireless transmission medium and installed in the recording unit 908. In addition, the program can be installed in the ROM 902 or the recording unit 908 in advance.

  Here, in the present specification, the processing performed by the computer according to the program does not necessarily have to be performed in time series in the order described as the flowchart. That is, the processing performed by the computer according to the program includes processing executed in parallel or individually (for example, parallel processing or object processing). The program may be processed by a single computer (processor) or may be distributedly processed by a plurality of computers.

  The embodiments of the present technology are not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present technology.

  Moreover, this technique can take the following structures.

(1)
A plurality of receiving units that receive a plurality of divided streams obtained by distributing a BB frame of a BB stream, which is a BB (BaseBand) frame stream, to a plurality of data slices;
A reconstruction unit that reconstructs the original BB stream from the plurality of divided streams,
The reconstructing unit, when channels for transmitting the plurality of data slices are connected, includes the plurality of divided streams including data transmitted in a frequency band made available by the connected channels. A receiving device that reconstructs the original BB stream from the plurality of divided streams based on concatenated channel information for enabling reception by the receiving unit.
(2)
The receiving apparatus according to (1), wherein the connected channel information is a bandwidth mode corresponding to the number of connected channels.
(3)
The bandwidth mode is determined according to a configuration of the plurality of receiving units, the plurality of divided streams including data transmitted in a frequency band made available according to the number of connected channels, The receiving device according to (2), wherein reception is possible by a plurality of receiving units.
(4)
The reception device according to any one of (1) to (3), wherein the connection channel information is included in transmission control information received together with the plurality of divided streams.
(5)
The concatenated channel information includes version information for managing the maximum value of data that can be transmitted by the data slice transmitted in each channel, and the maximum value of data that can be transmitted by the data slice transmitted in each channel. The receiving apparatus according to (1), which is information on at least one of the extended modes indicating whether or not there is a change.
(6)
The concatenated channel information is included in transmission control information received together with the plurality of divided streams,
In the transmission control information, when the extended mode indicates that there is a change in the maximum value of the data slice, the changed maximum value is set for data that can be transmitted by the data slice. The receiving device described in 1.
(7)
A plurality of receiving units for receiving a plurality of divided streams obtained by distributing a BB frame of a BB stream that is a stream of BB frames to a plurality of data slices;
In a receiving method of a receiving apparatus comprising: a reconfiguration unit that reconfigures the original BB stream from the plurality of divided streams,
The reconstruction unit is
When channels for transmitting the plurality of data slices are connected, the plurality of divided streams including data transmitted in a frequency band made available by the connected channels can be received by the plurality of receiving units. A receiving method comprising: reconstructing the original BB stream from the plurality of divided streams based on concatenated channel information.
(8)
When channels that transmit multiple segment streams obtained by distributing BB frames of BB streams that are BB frame streams to multiple data slices are connected, they can be used by the connected channels. A generating unit that generates transmission control information including concatenated channel information for enabling reception of the plurality of divided streams including data transmitted in a frequency band according to a configuration of a receiving device;
A transmission apparatus comprising: a transmission unit that transmits the transmission control information together with the plurality of divided streams.
(9)
The transmission apparatus according to (8), wherein the connected channel information is a bandwidth mode corresponding to the number of connected channels.
(10)
The bandwidth mode is determined according to the configuration of the receiving device, and the plurality of divided streams including data transmitted in a frequency band that has become available according to the number of connected channels is transmitted to the receiving device. The transmission device according to (9), wherein reception is possible according to the configuration of
(11)
The concatenated channel information includes version information for managing the maximum value of data that can be transmitted by the data slice transmitted in each channel, and the maximum value of data that can be transmitted by the data slice transmitted in each channel. The transmission device according to (8), which is information on at least one of the extended modes indicating whether or not there is a change.
(12)
In the transmission control information, when the extended mode indicates that there is a change in the maximum value of the data slice, the changed maximum value is set for the data that can be transmitted by the data slice. The transmitting device according to 1.
(13)
In the transmission method of the transmission device,
The transmitting device is
When channels that transmit multiple segment streams obtained by distributing BB frames of BB streams that are BB frame streams to multiple data slices are connected, they can be used by the connected channels. Generating a plurality of divided streams including data transmitted in a frequency band, generating transmission control information including concatenated channel information for enabling reception according to a configuration of a receiving device;
A transmission method including a step of transmitting the transmission control information together with the plurality of divided streams.

  DESCRIPTION OF SYMBOLS 1 Transmission system, 10 transmitter, 20 receiver, 111 control part, 112 input processing part, 113 data slice processing part, 114 frame structure part, 115 transmission part, 151 channel bonding setting part, 152 transmission control information generation part, 211 Control unit, 212 RF tuner unit, 213 demodulation unit, 214 synthesis unit, 251 transmission control information acquisition unit, 252 channel bonding control unit, 900 computer, 901 CPU

Claims (13)

A plurality of receiving units that receive a plurality of divided streams obtained by distributing a BB frame of a BB stream, which is a BB (BaseBand) frame stream, to a plurality of data slices;
A reconfiguration unit configured to reconfigure the original BB stream from the plurality of divided streams based on transmission control information ,
The plurality of receiving units are provided in the same number as the plurality of divided streams,
The transmission control information is a frequency band after connection including a part of the frequency band between the channels that is made available by connecting the channels when the channels that transmit the divided streams are connected. Linked channel information for enabling each receiving unit to receive each of the divided streams transmitted for each channel composed of the frequency band after the connection having a bandwidth increased from the frequency band before the connection. Including
The reconstruction unit, when the channel for transmitting the respective divided stream is connected, on the basis of the connection channel information, from said plurality of split streams, the receiving apparatus for reconstructing the original of the BB stream. The receiving apparatus according to claim 1, wherein the connected channel information is a bandwidth mode corresponding to the number of connected channels. The bandwidth mode, the is determined according to the configuration of a plurality of receiving portions, each of said split stream to be transmitted to each channel consisting of a frequency band after the connection corresponding to the number of concatenated channels, each The receiving device according to claim 2, wherein the receiving unit enables reception. The transmission control information, the receiving apparatus according to claim 3 that will be received with the plurality of divided streams. The concatenated channel information includes version information for managing the maximum value of data that can be transmitted by the data slice included in each segment stream transmitted in each channel, and each segment stream transmitted in each channel. The receiving apparatus according to claim 1, wherein at least one piece of information is included in an extended mode indicating whether or not a maximum value of data that can be transmitted by the data slice included in the data slice is changed. The transmission control information is received together with the plurality of divided streams ,
6. The transmission control information is set with a changed maximum value for data that can be transmitted by the data slice when the extended mode indicates that the maximum value of the data slice is changed. The receiving device described in 1. A plurality of receiving units for receiving a plurality of divided streams obtained by distributing a BB frame of a BB stream that is a stream of BB frames to a plurality of data slices;
A reconfiguration unit configured to reconfigure the original BB stream from the plurality of divided streams based on transmission control information ,
The plurality of receiving units are provided in the same number as the plurality of divided streams,
The transmission control information is a frequency band after connection including a part of the frequency band between the channels that is made available by connecting the channels when the channels that transmit the divided streams are connected. Linked channel information for enabling each receiving unit to receive each of the divided streams transmitted for each channel composed of the frequency band after the connection having a bandwidth increased from the frequency band before the connection. including
In the receiving method of the receiving device,
The reconstruction unit is
If the channel transmitting the respective divided stream is connected, on the basis of the connection channel information, from said plurality of split streams, the receiving method comprising the step of reconstructing the original of the BB stream. When channels that transmit each divided stream in a plurality of divided streams obtained by distributing a BB frame of a BB stream that is a BB frame stream to a plurality of data slices are connected, the channels are connected. A channel consisting of a frequency band after the connection including a part of the frequency band between the channels that has become available, and having a bandwidth increased from the frequency band before the connection. A generating unit that generates transmission control information including concatenated channel information for enabling each of the divided streams to be transmitted every time according to a configuration of a receiving device;
A transmission apparatus comprising: a transmission unit that transmits the transmission control information together with the plurality of divided streams. The transmission apparatus according to claim 8, wherein the connected channel information is a bandwidth mode corresponding to the number of connected channels. The bandwidth mode, the is determined according to the configuration of the receiving apparatus, the respective divided stream to be transmitted to each channel consisting of a frequency band after the connection corresponding to the number of concatenated channels, the receiving device The transmission device according to claim 9, wherein reception is possible according to a configuration. The concatenated channel information includes version information for managing the maximum value of data that can be transmitted by the data slice included in each segment stream transmitted in each channel, and each segment stream transmitted in each channel. The transmission apparatus according to claim 8, wherein the information is at least one information in an extended mode indicating whether or not the maximum value of data that can be transmitted by the data slice included in the data slice is changed. 12. The transmission control information is set with a changed maximum value for data that can be transmitted by the data slice when the extended mode indicates that the maximum value of the data slice is changed. The transmitting device according to 1. In the transmission method of the transmission device,
The transmitting device is
When channels that transmit each divided stream in a plurality of divided streams obtained by distributing a BB frame of a BB stream that is a BB frame stream to a plurality of data slices are connected, the channels are connected. A channel consisting of a frequency band after the connection including a part of the frequency band between the channels that has become available, and having a bandwidth increased from the frequency band before the connection. wherein each segment stream, the transmission control information generated for generating a containing coupling channel information for enabling reception according to the configuration of the receiving apparatus transmitted every,
A transmission method including a step of transmitting the transmission control information together with the plurality of divided streams.

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