Transmitting device and receiving device

Abstract

To efficiently transmit and receive a control signal related to CB transmission.SOLUTION: A transmitter includes a system separation unit which assigns a data signal of a specific hierarchy among a plurality of hierarchies to a system corresponding to one physical channel among a plurality of physical channels, to distribute the data signal of each hierarchy other than the specific hierarchy to each of a plurality of systems.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a transmission device, a reception device, and a control device.

Background Art

[0002] Terrestrial digital television broadcasting in Japan is characterized by the ability to simultaneously provide an HD (High-Definition) video quality broadcast service and a one-seg broadcast service with SD (Standard-Definition) video quality on one physical channel. In next-generation terrestrial digital television broadcasting, a UHD (Ultra-high Definition) video quality broadcast service is assumed, and the development of a terrestrial broadcast enhancement system (hereinafter referred to as the "enhancement system"), which is a transmission method, is underway. As an optional function of the enhancement system, there is channel bonding (hereinafter referred to as "CB") transmission. CB transmission is a function that expands the transmission capacity by combining N (an integer satisfying N ≧ 2) physical channels (ch). For example, in the case of CB transmission with N = 2, there are two modes: the Plain mode in which the data stream is divided into two streams in the transport layer before error correction coding, and the MIMO (Multiple-Input and Multiple-Output) like mode in which the data stream is divided into two streams in the physical layer after error correction coding. When the C / N (Carrier to Noise ratio) of the two physical channels is different, the MIMO like mode can obtain a diversity effect compared to the Plain mode, so the transmission characteristics are improved. Hereinafter, the two physical channels constituting the CB transmission with N = 2 are referred to as the primary channel and the secondary channel.

[0003] As a use case of CB transmission in the case of N = 2, there are examples such as the transmission of 8K video content with a frame rate of 120 Hz, sharing of two channels by three or more operators, and the deployment of a migration ch that provides the same service as the current terrestrial digital broadcasting system in Japan, ISDB-T (Integrated Services Digital Broadcasting-Terrestrial). As a prior example, in ATSC (Advanced Television Systems Committee) 3.0, which is the next-generation terrestrial broadcasting system in the United States, CB transmission that combines two channels is defined as an optional function (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the advanced system, the transmission band of one physical ch can be divided into a plurality of segments, and for each segment, "hierarchical transmission" can be performed to transmit broadcast services with different transmission tolerances and transmission capacities. In particular, as shown in FIG. 20A, by setting a partial reception band that arranges the hierarchical (A layer) for transmitting broadcast services for mobile bodies such as in-vehicle receivers and mobile terminals in the center of the band, the calculation amount at the receiving terminal can be reduced, and power saving can be achieved. In FIG. 20A, hierarchical transmission of two layers (A layer and B layer) is shown as an example. The B layer is, for example, a layer for transmitting broadcast services for television receivers installed in homes and the like. The B layer is arranged across the entire band of one physical ch. The television receiver can receive high-quality broadcast services by demodulating the signals of the entire band.

[0006] In CB transmission, since it is necessary to simultaneously receive signals transmitted on different N physical channels, it is necessary to activate N tuners. Therefore, as shown in FIG. 20B, when the broadcast service for mobile devices in the A layer is divided and transmitted on two physical channels by CB transmission, it is necessary to activate two tuners, and the merit of power saving becomes small.

[0007] An object of the present invention is to solve the above-described problems and provide a transmission device, a reception device, and a control device that can achieve power saving in a reception device when transmitting data signals of a plurality of layers by CB transmission.

Means for Solving the Problems

[0008] In order to solve the above problems, a transmission device according to the present invention is a transmission device that transmits data signals of a plurality of layers with different resistances by channel bonding transmission combining a plurality of physical channels, and among the plurality of layers, a data signal of a specific layer is assigned to a system corresponding to one physical channel among the plurality of physical channels, and a system separation unit that distributes data signals of each layer other than the specific layer to each of a plurality of systems corresponding to the plurality of physical channels is provided.

[0009] Further, in the transmission device according to the present invention, it is preferable that the system separation unit distributes the data signals of the layers other than the specific layer to the plurality of systems according to a ratio between the data signals of the layers other than the specific layer that can be distributed to the one physical channel and the data signals of the layers other than the specific layer that can be distributed to physical channels other than the one physical channel.

[0010] Also, in the transmission apparatus according to the present invention, a first control information generation unit that generates TMCC information in which flag information indicating whether to perform channel bonding transmission in the physical channel is superimposed, and a second control information generation unit that generates control information for channel bonding including at least frequency information of a plurality of physical channels constituting the channel bonding transmission. The TMCC signal generated based on the TMCC information is multiplexed on each of the plurality of systems, and the control information for channel bonding is preferably multiplexed on at least one of the data signals of the plurality of layers and the low-latency data signal transmitted with lower latency than the data signals of the plurality of layers.

[0011] Also, in the transmission apparatus according to the present invention, the control information for channel bonding is preferably multiplexed on the data signal of the specific layer.

[0012] Further, the receiving apparatus according to the present invention is a receiving apparatus that receives data signals of a plurality of layers with different resistances transmitted by channel bonding transmission combining a plurality of physical channels. Among the plurality of layers, the data signal of a specific layer is transmitted via one of the plurality of physical channels, and the data signals of the layers other than the specific layer are distributed and transmitted to the plurality of physical channels. A plurality of tuners that receive signals transmitted via the physical channels, and when receiving the data signal of the specific layer, activate the one tuner to receive the signal transmitted via the one physical channel, and when receiving the data signal of the layer other than the specific layer, activate the one tuner to receive the signal transmitted via the one physical channel, and activate a tuner other than the one tuner among the plurality of tuners to receive a signal transmitted via a physical channel other than the one physical channel. It comprises a control unit.

[0013] Also, in the receiving apparatus according to the present invention, a TMCC signal including TMCC information and a low-latency data signal transmitted with lower latency than the data signals of the plurality of layers are multiplexed in the data signals of the plurality of layers. Flag information indicating whether or not to perform channel bonding transmission in the physical channel is superimposed on the TMCC information. Channel bonding control information including at least frequency information of a plurality of physical channels constituting the channel bonding transmission is multiplexed in at least one of the data signals of the plurality of layers and the low-latency data signal. Further provided is a determination unit that determines whether or not channel bonding transmission is being performed on the one physical channel based on the flag information superimposed on the TMCC information included in the TMCC signal extracted from the received signal of the one tuner. When it is determined by the determination unit that channel bonding transmission is being performed and data signals of layers other than the specific layer are received, based on the channel bonding control information multiplexed in at least one of the data signals of the plurality of layers and the low-latency data signal, the one physical channel and the other physical channels constituting the channel bonding transmission are discriminated, and it is preferable that a signal transmitted on the discriminated physical channel is received by a tuner other than the one tuner among the plurality of tuners.

Advantages of the Invention

[0015] According to the transmission apparatus, the receiving apparatus, and the control apparatus according to the present invention, when CB transmission is performed on data signals of a plurality of layers, power saving in the receiving apparatus can be achieved.

Brief Description of the Drawings

[0016]

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Figure 20A

Figure 20B

Mode for Carrying Out the Invention

[0017] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0018] (First Embodiment) FIG. 1 is a diagram showing a configuration example of a transmission / reception system 1 according to a first embodiment of the present invention. FIG. 1 shows a configuration example of the transmission / reception system 1 when channel bonding transmission (CB transmission) in Plain mode is performed. In the current ISDB-T, hierarchical transmission is performed in which data signals of a plurality of layers having different transmission tolerances and transmission capacities are simultaneously transmitted within the same channel. Further, in the advanced method, it has been studied to transmit emergency earthquake warnings and the like at a lower latency (Low Latency) than the data signals of each layer on the same physical channel as the data signals of each layer. A transmission path through which such a low-latency data signal (low-latency data signal) is transmitted is referred to as LLch. Hereinafter, description will be made assuming that hierarchical transmission of three layers (layer A, layer B, and layer C) and transmission on LLch are performed.

[0019] The transmission / reception system 1 shown in FIG. 1 includes a remultiplexing device 10 as a transmission device according to the present invention, two modulation devices 20 (modulation devices 20p, 20s), two transmitters 30 (transmitters 30p, 30s), two receivers 40 (receivers 40p, 40s), and a demodulation device 50 as a reception device according to the present invention. The modulation device 20p, the transmitter 30p, and the receiver 40p are provided corresponding to the primary ch, and the modulation device 20s, the transmitter 30s, and the receiver 40s are provided corresponding to the secondary ch. Note that hereinafter, the case where N = 2 CB transmission is performed is described as an example, but the present invention is not limited thereto and is also applicable to the case where CB transmission combining three or more physical channels is performed.

[0020] The remultiplexing device 10 remultiplexes the data signals (video and audio data) of each layer of hierarchical transmission and the data signal of the LLch. When performing CB transmission, the remultiplexing device 10 separates the multiplexed frame obtained by remultiplexing the data signals of each layer and the data signal of the LLch into two systems corresponding to the primary ch and the secondary ch, respectively. The remultiplexing device 10 outputs one system to the modulation device 20p corresponding to the primary ch and the other system to the modulation device 20s corresponding to the secondary ch.

[0021] The modulation device 20p performs predetermined processes such as error correction coding and carrier modulation on the output of the remultiplexing device 10 to form an OFDM (Orthogonal Frequency Division Multiplexing) frame. The modulation device 20p performs IFFT (Inverse Fast Fourier Transform) processing and addition of a guard interval (GI) on the formed OFDM frame and outputs it to the transmitter 30p. The transmitter 30p transmits the OFDM frame output from the modulation device 20p via the primary ch. The modulation device 20s performs predetermined processes such as error correction coding and modulation on the output of the remultiplexing device 10 to form an OFDM frame. The modulation device 20s performs IFFT and addition of GI on the formed OFDM frame and outputs it to the transmitter 30s. The transmitter 30s transmits the OFDM frame output from the modulation device 20s via the secondary ch. The transmitter 30p and the transmitter 30s are synchronized and emit broadcast waves at the same timing.

[0022] The receiver 40p receives the broadcast wave transmitted from the transmitter 30p via the primary ch and outputs the received signal to the demodulation device 50. The receiver 40s receives the broadcast wave transmitted from the transmitter 30s via the secondary ch and outputs the received signal to the demodulation device 50.

[0023] When CB transmission is being performed, the demodulation device 50 demodulates the received signals of the receiver 40p and the receiver 40s, and acquires and outputs the data signals of each layer and the data signal of the LLch that have been transmitted via the primary ch and the secondary ch.

[0024] Next, the configurations of the remultiplexing device 10 as the transmission device according to the present invention, the modulation device 20, and the demodulation device 50 as the reception device according to the present invention will be described. Since the configurations of the transmitter 30 and the receiver 40 are not directly related to the present invention, the description thereof will be omitted.

[0025] First, before describing the configuration of the remultiplexing device 10, for the purpose of comparison, the configuration of a conventional remultiplexing device 10a that does not support CB transmission will be described with reference to FIG. 2.

[0026] When hierarchical transmission (A layer, B layer, and C layer) and transmission on the LLch are performed, a multiplexing device is provided corresponding to each layer and the LLch. The multiplexing device corresponding to each layer multiplexes the video and audio data transmitted in the corresponding layer, and packetizes it into packets in, for example, the MMT (MPEG Media Transport) format (MMT packets). The multiplexing device for each layer generates an IP packet (hereinafter referred to as an "MMT / IP packet") storing the generated MMT packets, and outputs it to the remultiplexing device 10a. Further, the multiplexing device corresponding to the LLch multiplexes the data transmitted on the LLch to generate MMT packets, and outputs an MMT / IP packet storing the MMT packets to the remultiplexing device 10a.

[0027] The remultiplexing device 10a remultiplexes the MMT / IP packets output from the multiplexing devices corresponding to each layer and LLch into one stream. As shown in FIG. 2, the remultiplexing device 10a includes a packet filter 101, an IP header compression unit 102, a TLV (Type Length Value) packetization unit 103, a FIFO (First In First Out) buffer 104, a FEC (Forward Error Correction) block configuration unit 105, a layer-by-layer frame configuration unit 106, an XMI (Extensible Modulation Interface) packetization unit 107, a packet filter 108, IP header compression units 109 and 110, TLV packetization units 111 and 112, FIFO buffers 113 and 114, an L0 symbol configuration unit 115, an L1 symbol configuration unit 116, a GPS reference signal generator 117, a synchronization control XMI packet configuration unit 118a, a staff XMI packet configuration unit 119, and an XMI packet transmission scheduler unit 120a. The packet filter 101, the IP header compression unit 102, the TLV packetization unit 103, the FIFO buffer 104, the FEC block configuration unit 105, the layer-by-layer frame configuration unit 106, and the XMI packetization unit 107 are provided corresponding to the A layer, the B layer, and the C layer respectively. In FIG. 2, only the configuration corresponding to the A layer is shown for simplicity of the figure. Hereinafter, the configuration corresponding to the A layer will be described, but the same applies to the B layer and the C layer.

[0028] The packet filter 101 receives the data (MMT / IP packet) of the A layer from a multiplexing device (not shown) corresponding to the A layer. The packet filter 101 selects (packet filtering) the packets to be transmitted based on the source IP address, destination IP address, protocol type of the IP header of the input MMT / IP packet, the source port number and destination port number of the UDP (User Datagram Protocol) header, etc., and outputs the selected MMT / IP packets to the IP header compression unit 102.

[0029] The IP header compression unit 102 compresses the IP header of the MMT / IP packet output from the packet filter 101 as necessary and outputs it to the TLV packetization unit 103.

[0030] The TLV packetization unit 103 receives TLV-formatted SI (Signaling Information) (TLV-SI). The SI defines, for example, a terrestrial distribution system descriptor indicating the physical conditions of a terrestrial transmission path. The TLV packetization unit 103 encapsulates the input TLV-SI and the MMT / IP packet output from the IP header compression unit 102 into a TLV packet to generate a TLV packet. The TLV packet includes a reserved area, a packet type area, a data length area, and a data area. The packet type area indicates the type of the TLV packet, and the data length area indicates the size of the data stored in the data area. The TLV packetization unit 103 stores the TLV-SI and the MMT / IP packet in the data area. Details regarding TLV are described, for example, in "Video coding, audio coding, and multiplexing specifications for digital broadcasting", ARIB-STD B32, and thus the description is omitted.

[0031] The TLV packetization unit 103 outputs the generated TLV packet to the FIFO buffer 104.

[0032] The FIFO buffer 104 stores the TLV packet output from the TLV packetization unit 103 and outputs the stored TLV packet to the FEC block configuration unit 105 in the order of storage.

[0033] The multiplexing device corresponding to each layer may output the multiplexed data as a TLV packet (TLV / IP packet) instead of an MMT / IP packet. In this case, the TLV packet output from the multiplexing device is stored in the FIFO buffer 104. When a TLV packet is input from the multiplexing device, the demultiplexing device 10a may not include the packet filter 101, the IP header compression unit 102, and the TLV packetization unit 103.

[0034] The FEC block configuration unit 105 forms FEC blocks at regular intervals from the TLV packets output from the FIFO buffer 104. An FEC block is a block (processing block) that is a unit of error correction coding processing.

[0035] An FEC block includes an FEC block header area, a main signal area, a BCH parity area, a staff bit area, and an LDPC parity area. The TLV packets output from the FIFO buffer 104 are stored in the main signal area. The FEC block header area is a field (first TLV indication field) in which information indicating the position of the first byte of the first TLV packet stored in the main signal area of the FEC block in terms of the number of bytes from the start of the FEC block excluding the FEC block header is stored. Bits "1" are stored in the BCH parity area, the staff bit area, and the LDPC area.

[0036] The FEC block configuration unit 105 concatenates the TLV packets output from the FIFO buffer 104 in the output order and stores them in the main signal area, and sets the value of the first TLV indication field for each FEC block. The FEC block configuration unit 105 outputs the configured FEC blocks to the hierarchical frame configuration unit 106.

[0037] The hierarchical frame configuration unit 106 forms hierarchical frames from the FEC blocks output from the FEC block configuration unit 105.

[0038] The hierarchical frame includes a frame header area and an FEC block area. In the FEC block area, a plurality of concatenated FEC blocks and fragments of FEC blocks are stored. The size of the hierarchical frame is determined according to the modulation method, FFT (Fast Fourier Transform) size, GI ratio, pilot signal ratio, and the number of segments (the number of segments obtained by dividing the frequency band of one physical channel (physical ch)).

[0039] The frame header area contains an FEC block pointer of a predetermined number of bits, and the remaining area stores bit "1". The FEC block pointer indicates, in bit units or byte units, the position of the leading bit of the first FEC block including the leading of the FEC block to be stored in the hierarchical frame from the start position of the FEC block area.

[0040] The hierarchical frame configuration unit 106 concatenates the FEC blocks output from the FEC block configuration unit 105 in the output order and stores them in the FEC block area. The hierarchical frame configuration unit 106 calculates an FEC block pointer from the position of the FEC block stored in the FEC block area and stores it in the frame header. The hierarchical frame configuration unit 106 outputs the configured hierarchical frame to the XMI packetization unit 107.

[0041] The XMI packetization unit 107 constructs an XMI packet (A - layer XMI packet) from the hierarchical frame output from the hierarchical frame configuration unit 106. Specifically, the XMI packetization unit 107 divides the hierarchical frame into a predetermined size (e.g., 10448 bits) to form data units. The XMI packet includes a header and a data unit area. The XMI packetization unit 107 stores the data units in the data unit area. Note that the last data unit may be less than the predetermined size. In this case, the XMI packetization unit 107 adds a predetermined number of bits (stuff bits) to the data unit that is less than the predetermined size to make it the predetermined size and stores it in the data unit area.

[0042] The XMI packetization unit 107 outputs the generated XMI packet to the XMI packet transmission scheduler unit 120a. Note that XMI is a protocol designed as an interface for outputting hierarchical OFDM frames to the modulator 20.

[0043] The packet filter 108 receives the LLch data (MMT / IP packet) from a multiplexing device (not shown) corresponding to LLch. Based on the source IP address, destination IP address, protocol type, source port number, and destination port number of the UDP header of the input MMT / IP packet, etc., the packet filter 108 selects (packet filtering) the packets to be transmitted and outputs the selected MMT / IP packets to the IP header compression unit 109 or the IP header compression unit 110.

[0044] The IP header compression unit 109 compresses the IP header of the MMT / IP packet output from the packet filter 108 as necessary and outputs it to the TLV packetization unit 111. The IP header compression unit 110 compresses the IP header of the MMT / IP packet output from the packet filter 108 as necessary and outputs it to the TLV packetization unit 112.

[0045] The TLV packetization unit 111 encapsulates the MMT / IP packet output from the IP header compression unit 109 into a TLV packet to generate a TLV packet and outputs it to the FIFO buffer 113. The TLV packetization unit 112 encapsulates the MMT / IP packet output from the IP header compression unit 110 into a TLV packet to generate a TLV packet and outputs it to the FIFO buffer 114.

[0046] The FIFO buffer 113 stores the TLV packets output from the TLV packetization unit 111 and outputs the stored TLV packets to the L0 symbol formation unit 115 in the storage order. The FIFO buffer 114 stores the TLV packets output from the TLV packetization unit 112 and outputs the stored TLV packets to the L1 symbol formation unit 116 in the storage order.

[0047] The multiplexing device corresponding to LLch may output the multiplexed data as TLV packets (TLV / IP packets) instead of MMT / IP packets. In this case, the TLV packets output from the multiplexing device are stored in the FIFO buffers 113 and 114. When TLV packets are input from the multiplexing device, the de-multiplexing device 10a may include a packet filter 121 instead of the packet filter 108.

[0048] Based on the source IP address, destination IP address, protocol type, source port number and destination port number of the UDP header, etc. of the TLV packet (TLV / IP packet) input from a multiplexing device (not shown) corresponding to LLch, the packet filter 121 selects (packet filtering) the packets to be transmitted and outputs the selected TLV packets to the FIFO buffer 13 or the FIFO buffer 114. Therefore, when TLV packets are input from the multiplexing device corresponding to LLch, the de-multiplexing device 10a may not include the packet filter 108, the IP header compression units 109 and 110, and the TLV packetization units 111 and 112.

[0049] The L0 symbol configuration unit 115 configures symbols (L0 symbols) from the TLV packets output from the FIFO buffer 113 and outputs them to the XMI packet transmission scheduler unit 120a. The L1 symbol configuration unit 116 configures symbols (L1 symbols) from the TLV packets output from the FIFO buffer 114 and outputs them to the XMI packet transmission scheduler unit 120a.

[0050] The L0 symbol is transmitted, for example, in the segments for partial reception among a plurality of segments obtained by dividing the frequency band of one physical ch, and the L1 symbol is transmitted in the remaining segments. Therefore, the packet filtering by the packet filter 108 (or the packet filter 121) is also performed according to such an allocation.

[0051] The GPS reference signal generator 117 outputs a reference signal with a fixed period generated from the GPS received signal.

[0052] The synchronization control XMI packet configuration unit 118a generates synchronization control information including transmission parameters for configuring the OFDM frame, the timing for transmitting the OFDM frame, and TMCC (Transmission and Multiplexing Configuration Control) information which is control information regarding the transmission of data signals of each layer. The TMCC information includes, for example, the carrier modulation method and coding rate of the data signals of each layer. The synchronization control XMI packet configuration unit 118a generates an XMI packet (hereinafter referred to as "synchronization control XMI packet") in which the generated synchronization control information is stored in the data unit area, and outputs it to the XMI packet transmission scheduler unit 120a.

[0053] The stuffing XMI packet configuration unit 119 constructs an XMI packet (hereinafter referred to as "stuffing XMI packet") in which only stuffing bits of the same size as the data unit are stored in the data unit area, and outputs it to the XMI packet transmission scheduler unit 120a. The stuffing XMI packet is used to keep the number of XMI packets output by the demultiplexer 10a constant per second even when the modulation method or coding rate is different.

[0054] The XMI packet transmission scheduler unit 120a multiplexes the XMI packets of each layer (A layer XMI packet, B layer XMI packet, and C layer XMI packet), the L0 symbol, the L1 symbol, the synchronization control XMI packet, and the stuffing XMI packet output from the L0 symbol configuration unit 115, the L1 symbol configuration unit 116, the synchronization control XMI packet configuration unit 118a, and the stuffing XMI packet configuration unit 119, respectively, corresponding to the A layer, B layer, and C layer into one stream, and outputs it to the transmitter 30.

[0055] In the current ISDB-T, a Single Frequency Network (SFN) that transmits the same broadcast content from multiple transmitting stations at the same frequency is adopted. Therefore, the XMI packet transmission scheduler unit 120a outputs XMI packets divided into a plurality of systems (two systems in FIG. 2). However, the data of each system is the same.

[0056] Next, the configuration of the remultiplexer 10 as a transmission device according to the present invention will be described with reference to FIG. 3. In FIG. 3, the same components as those in FIG. 2 are denoted by the same reference numerals, and the description thereof will be omitted. In FIG. 3, the case where CB transmission with N = 2 is performed will be described as an example. However, as described above, it should be noted that the present invention is applicable even when N is an integer of 3 or more.

[0057] The remultiplexer 10 shown in FIG. 3 includes a packet filter 101, an IP header compression unit 102, a TLV packetization unit 103, a FIFO buffer 104, an FEC block configuration unit 105, a hierarchical frame configuration unit 106, an XMI packetization unit 107, a packet filter 108, IP header compression units 109 and 110, TLV packetization units 111 and 112, FIFO buffers 113 and 114, an L0 symbol configuration unit 115, an L1 symbol configuration unit 116, a GPS reference signal generator 117, a synchronization control XMI packet configuration unit 118, a staff XMI packet configuration unit 119, an XMI packet transmission scheduler unit 120, and a CB TLV-SI generation unit 122. The remultiplexer 10 shown in FIG. 3 is different from the remultiplexer 10a shown in FIG. 2 in that the CB TLV-SI generation unit 122 is added, and the synchronization control XMI packet configuration unit 118a and the XMI packet transmission scheduler unit 120a are changed to the synchronization control XMI packet configuration unit 118 and the XMI packet transmission scheduler unit 120, respectively. The synchronization control XMI packet configuration unit 118 is an example of a first control information generation unit. The CB TLV-SI generation unit 122 is an example of a second control information generation unit.

[0058] The synchronous control XMI packet component 118 generates synchronous control information including TMCC information regarding the transmission of data signals at each layer, similar to the synchronous control XMI packet component 118a, and generates a synchronous control XMI packet in which the generated synchronous control information is stored in the data unit area. In the present embodiment, the synchronous control XMI packet component 118 superimposes a CB flag (flag information) indicating whether to perform CB transmission on the physical ch that transmits data signals at each layer on the TMCC information. The synchronous control XMI packet component 118 outputs a synchronous control XMI packet in which the synchronous control information including the TMCC information with the CB flag superimposed is stored in the data unit area to the XMI packet transmission scheduler unit 120.

[0059] The CB TLV-SI generation unit 122 generates control information for channel bonding (hereinafter referred to as "CB control information"), which is control information necessary for receiving CB transmission. Specifically, the CB TLV-SI generation unit 122 generates a packet in TLV format (hereinafter referred to as "CB TLV-SI packet") including the CB control information. The CB control information includes at least the frequency information of the physical ch constituting the CB transmission used within the area. For example, if N = 2, it includes the frequency information of the primary ch and the secondary ch that form a pair. When an MFN (Multi-Frequency Network) that uses different frequencies for each area is adopted, the CB control information includes at least the frequency information of the physical ch constituting the CB transmission in all areas. For example, if N = 2, it includes the frequency information of the primary ch and the secondary ch. The CB TLV-SI generation unit 122 outputs the generated CB TLV-SI packet to the TLV packetization unit 112 and the XMI packet transmission scheduler unit 120 at regular intervals (for example, at intervals of 1 second).

[0060] The TLV packetization unit 112 outputs the TLV packet storing the MMT / IP packet output from the IP header compression unit 110 in the data area, and the TLV-SI packet for CB output from the TLV-SI generation unit 122 for CB to the FIFO buffer 114. The TLV packet and the TLV-SI packet for CB stored in the FIFO buffer 114 are output to the L1 symbol configuration unit 116, and the L1 symbol is configured. The L1ch through which the L1 symbol is transmitted may also be used for applications such as PAPR (Peak to Average Power Ratio) reduction. The TLV-SI generation unit 122 for CB outputs the TLV-SI packet for CB so that the TLV-SI packet for CB is transmitted at a transmission rate that does not affect the use of the L1ch.

[0061] The XMI packet transmission scheduler unit 120 multiplexes the TLV-SI packet for CB with the XMI packets of each layer, although details will be described later. The XMI packet transmission scheduler unit 120 multiplexes the XMI packets of each layer, the L0 symbol, the L1 symbol, the synchronization control XMI packet, and the staff XMI packet, with which the TLV-SI packet for CB is multiplexed, into one system, separates them into two systems corresponding to the primary ch and the secondary ch, respectively, and outputs them to the modulation devices 20p and 20s.

[0062] Thus, in the present embodiment, the TLV-SI generation unit 122 for CB outputs the TLV-SI packet for CB including the CB control information to the TLV packetization unit 112 and the XMI packet transmission scheduler unit 120. By doing so, the TLV-SI generation unit 122 for CB can multiplex the CB control information with the data signals of each layer that are video / audio data and the data signal of the LLch (low-latency data signal).

[0063] FIG. 4 is a diagram showing a configuration example of the XMI packet transmission scheduler unit 120.

[0064] As shown in FIG. 4, the XMI packet transmission scheduler unit 120 includes an A - layer XMI packet distribution unit 1201, a B - layer XMI packet distribution unit 1202, a C - layer XMI packet distribution unit 1203, an L0 symbol distribution unit 1204, an L1 symbol distribution unit 1205, a CB - used TLV - SI packet distribution unit 1206, a primary ch XMI transmission scheduler unit 1207, and a secondary ch XMI transmission scheduler unit 1208. The A - layer XMI packet distribution unit 1201, the B - layer XMI packet distribution unit 1202, and the C - layer XMI packet distribution unit 1203 are examples of system separation units.

[0065] The A - layer XMI packet distribution unit 1201 receives an A - layer XMI packet and control information related to hierarchical transmission (for example, the number of layers, the number of segments, etc.). The A - layer XMI packet distribution unit 1201 outputs the input A - layer XMI packet to the primary ch XMI scheduler unit 1207 corresponding to the primary ch. As described above, the A - layer is a layer that transmits broadcast services for mobile bodies such as in - vehicle receivers and mobile terminals, and among the multiple layers of hierarchical transmission, it is a layer with higher resistance than other layers.

[0066] The B - layer XMI packet distribution unit 1202 receives a B - layer XMI packet and control information related to hierarchical transmission. As shown in FIG. 5, the B - layer XMI packet distribution unit 1202 switches the connection destination of the switch between the primary ch XMI scheduler unit 1207 and the secondary ch XMI transmission scheduler unit 1208 based on the control information, and distributes and outputs the input B - layer XMI packet to the primary ch XMI scheduler unit 1207 corresponding to the primary ch and the secondary ch XMI transmission scheduler unit 1208 corresponding to the secondary ch. In this way, the B - layer XMI packet distribution unit 1202 distributes the B - layer data to two systems corresponding to the primary ch and the secondary ch respectively.

[0067] Referring to FIG. 4 again, in the same manner as the B - layer XMI packet distributor 1202, the C - layer XMI packet distributor 1203 distributes and outputs the C - layer XMI packets to the primary chXMI scheduler section 1207 and the secondary chXMI transmission scheduler section 1208. Since the configuration of the C - layer XMI packet distributor 1203 is the same as that of the B - layer XMI packet distributor 1202, the description thereof is omitted.

[0068] As described above, in this embodiment, the A - layer XMI packet distributor 1201, the B - layer XMI packet distributor 1202, and the C - layer XMI packet distributor 1203, which serve as the system separation section, allocate the data signals of a specific layer (A - layer) among the multiple layers to the system corresponding to one of the two physical channels (primary ch) of the two physical channels (primary ch and secondary ch), and allocate the data signals of the layers other than the specific layer (B - layer and C - layer) to the two systems corresponding to the two physical channels respectively. As described above, the number N of the physical channels constituting the CB transmission may be 3 or more. In this case, the data signals of the specific layer (A - layer) are allocated to one of the multiple physical channels, and the data signals of the layers other than the specific layer (B - layer and C - layer) are allocated to each of the N physical channels.

[0069] As described above, in the present embodiment, the A - layer XMI packet is allocated only to the line corresponding to the primary ch. Therefore, the rates at which the B - layer and C - layer data signals can be transmitted are different between the primary ch and the secondary ch. For this reason, the B - layer XMI packet distribution unit 1202 and the C - layer XMI packet distribution unit 1203 distribute the B - layer and C - layer data signals to the two physical channels according to the ratio between the B - layer and C - layer data signals that can be allocated to the primary ch (one physical ch), excluding the A - layer data signal, and the B - layer and C - layer data signals that can be allocated to the secondary ch (the other physical ch). For example, when the number of segments is 35, the number of segments of the A - layer is 4, and the A - layer data signal is transmitted in the partial reception band of the primary ch, the number of segments to which the B - layer and C - layer data signals can be allocated in the primary ch is 31, and the number of segments to which the B - layer and C - layer data signals can be allocated in the secondary ch is 35. Therefore, the ratio of the rate at which the B - layer and C - layer data signals can be transmitted in the primary ch to the rate at which the B - layer and C - layer data signals can be transmitted in the secondary ch is 31:35. The B - layer XMI packet distribution unit 1202 and the C - layer XMI packet distribution unit 1203 respectively output the B - layer XMI packet and the C - layer XMI packet to the primary ch XMI transmission scheduler unit 1207 and the secondary ch XMI transmission scheduler unit 1208 according to this ratio.

[0070] The L0 symbol distribution unit 1204 receives the L0 symbol. As shown in FIG. 6, the L0 symbol distribution unit 1204 is connected to the primary ch XMI transmission scheduler unit 1207 and the secondary ch XMI transmission scheduler unit 1208, and outputs the input L0 symbol to each of the primary ch XMI transmission scheduler unit 1207 and the secondary ch XMI transmission scheduler unit 1208.

[0071] Referring to FIG. 4 again, in the same manner as the L0 symbol allocator 1204, the L1 symbol allocator 1205 outputs L1 symbols to the primary chXMI transmission scheduler 1207 and the secondary chXMI transmission scheduler 1208 respectively. In the same manner as the L0 symbol allocator 1204, the TLV-SI packet allocator 1206 for CB outputs TLV-SI packets for CB to the primary chXMI transmission scheduler 1207 and the secondary chXMI transmission scheduler 1208 respectively. Since the configurations of the L1 symbol allocator 1205 and the TLV-SI packet allocator 1206 for CB are the same as that of the L0 symbol allocator 1204, the description thereof is omitted.

[0072] The primary chXMI transmission scheduler 1207 receives a synchronization control XMI packet, a staff XMI packet, XMI packets of each layer (A-layer XMI packet, B-layer XMI packet, and C-layer XMI packet), L0 symbols, L1 symbols, and TLV-SI packets for CB. The primary chXMI transmission scheduler 1207 multiplexes the input synchronization control XMI packet, staff XMI packet, XMI packets of each layer, L0 symbols, L1 symbols, and TLV-SI packets for CB into one stream and outputs the result to the modulator 20p.

[0073] Specifically, at the beginning of the OFDM frame, the primary chXMI transmission scheduler unit 1207 outputs one synchronization control XMI packet. Subsequently, the primary chXMI transmission scheduler unit 1207 outputs XMI packets of each layer and TLV-SI packets for CB. As described above, the TLV-SI packets for CB are output at regular intervals. Therefore, the primary chXMI transmission scheduler unit 1207 outputs TLV-SI packets for CB at regular intervals between the XMI packets of each layer. In this way, the TLV-SI packets for CB are multiplexed with the XMI packets of each layer into one stream and output to the modulator 20p. When the primary chXMI transmission scheduler unit 1207 has output all the XMI packets of each layer, it outputs staff XMI packets so that the number of XMI packets constituting the OFDM frame is constant. In the data unit area of the XMI packets of each layer, areas for storing L0 symbols and L1 symbols (L0 symbol storage area, L1 symbol storage area) are allocated. When the L0 symbol is input, the primary chXMI transmission scheduler unit 1207 promptly (with low latency) allocates the L0 symbol to the L0 symbol storage area of the XMI packets of each layer, and when the L1 symbol is input, it promptly (with low latency) allocates the L1 symbol to the L1 symbol storage area of the XMI packets of each layer. By doing so, the primary chXMI transmission scheduler unit 1207 can output the data of the LLch to the modulator 20 with low latency.

[0074] The secondary chXMI transmission scheduler unit 1208 multiplexes the input synchronization control XMI packet, staff XMI packet, XMI packets of each layer, L0 symbol, L1 symbol, and TLV-SI packet for CB into one stream in the same manner as the primary chXMI transmission scheduler unit 1207, and outputs the result to the modulation device 20s. However, the A-layer XMI packet is not input to the secondary chXMI transmission scheduler unit 1208. Therefore, the secondary chXMI transmission scheduler unit 1208 multiplexes the synchronization control XMI packet, staff XMI packet, B-layer XMI packet, C-layer XMI packet, L0 symbol, L1 symbol, and TLV-SI packet for CB into one stream, and outputs the result to the modulation device 20s.

[0075] The XMI packets output from the primary chXMI transmission scheduler unit 1207 and the secondary chXMI scheduler unit 1208 are input to the modulation device 20 via a wired line or a wireless line (STL (Studio to Transmitter Link), TTL (Transmitter to Transmitter Link)).

[0076] In this way, the XMI packet transmission scheduler unit 120 multiplexes and transmits the LLch data signal and the TMCC information to each of the data signals of each layer distributed to two systems (the first system and the second system) corresponding to two physical channels (primary channel and secondary channel).

[0077] Note that the TMCC information includes a partial reception flag indicating whether data signals are being transmitted in the partial reception band. In this embodiment, the data signals of layer A transmitted in the partial reception band are allocated only to the primary ch. Therefore, the synchronization control XMI packet component 118 outputs a synchronization control XMI packet including TMCC information with the value of the partial reception flag being "0 (= ON (data signal transmission in the partial reception band))" to the primary ch XMI transmission scheduler unit 1207. Also, the synchronization control XMI packet component 118 outputs a synchronization control XMI packet including TMCC information with the value of the partial reception flag being "1 (= OFF (no data signal transmission in the partial reception band))" to the secondary ch XMI transmission scheduler unit 1208.

[0078] In this embodiment, an example in which the CB control information is multiplexed with the data signals (XMI packets) of each layer and the data signals (L1 symbols) of the LLch has been described, but the present invention is not limited to this. When Plain mode CB transmission is performed, the CB control information may be multiplexed with only one of the data signals of each layer and the data signals of the LLch. Therefore, the configuration of the demultiplexing device 10 may be appropriately changed according to whether the CB control information is multiplexed only with the data signals of each layer, only with the data signals of the LLch, or with both. Also, as described above, the number N of physical chs constituting the CB transmission may be 3 or more (N ≧ 3). Even in the case of N ≧ 3, the data signals of a specific layer can be distributed to one system, the data signals of layers other than the specific layer can be distributed to each of the N systems, and the data signals of the LLch can be multiplexed with each of the N systems.

[0079] Next, the configuration of the modulation device 20 according to this embodiment will be described with reference to FIG. 7.

[0080] As shown in FIG. 7, the modulation device 20 according to the present embodiment includes an input I / F unit 201, an error correction encoding unit 202, a bit interleaving unit 203, a mapping unit 204, a pilot signal generation unit 205, a TMCC information bit generation unit 206, a TMCC signal generation unit 207, a hierarchical synthesis unit 208, a time / frequency interleaving unit 209, an OFDM frame configuration unit 210, and an IFFT / GI addition unit 211. The error correction encoding unit 202, the bit interleaving unit 203, and the mapping unit 204 are provided corresponding to the A layer, the B layer, and the C layer, respectively. However, in FIG. 7, only the configuration corresponding to the A layer is shown for simplification of the figure.

[0081] The input I / F unit 201 receives a multiplexed frame in which XMI packets of each layer, an XMI packet of LLch, a synchronization control XMI packet, and a staff XMI packet are multiplexed into one system from the demultiplexing device 10. The input I / F unit 201 extracts data signals of each layer from the input multiplexed frame and outputs them to the error correction encoding unit 202 of the corresponding layer. The input I / F unit 201 extracts the data signal of LLch from the input multiplexed frame and outputs it to the OFDM frame configuration unit 210. The input I / F unit 201 extracts TMCC information from the input multiplexed frame and outputs it to the pilot signal generation unit 205 and the TMCC information bit generation unit 206.

[0082] The error correction encoding unit 202 performs error correction encoding on the input data signal of the A layer in units of FEC blocks and outputs it to the bit interleaving unit 203.

[0083] The bit interleaving unit 203 performs interleaving on the data sequence output from the error correction encoding unit 202 in units of bits. Examples of bit-level interleaving include bit rotation in which a bit sequence is blocked in a predetermined unit and the bit order within each block is changed. The bit interleaving unit 203 outputs the interleaved data sequence to the mapping unit 204.

[0084] The mapping unit 204 maps the data sequence output from the bit interleaving unit 203 for each predetermined number of bits onto the I-Q plane based on the modulation method of the corresponding layer, and performs carrier modulation. In this way, the mapping unit 204 converts the data sequence into carrier symbols. The mapping unit 204 outputs the generated carrier symbols to the hierarchical synthesis unit 208.

[0085] The pilot signal generation unit 205 generates a pilot signal to be incorporated into the OFDM frame based on the input TMCC information, and outputs it to the OFDM frame configuration unit 210.

[0086] The TMCC information bit generation unit 206 generates TMCC information bits based on the input TMCC information, and outputs the generated TMCC information bits to the TMCC signal generation unit 207. As described above, the TMCC information is superimposed with a CB flag indicating whether to perform CB transmission.

[0087] The TMCC signal generation unit 207 generates a TMCC signal based on the TMCC information bits output from the TMCC information bit generation unit 206, and outputs it to the OFDM frame configuration unit 210.

[0088] The hierarchical synthesis unit 208 hierarchically synthesizes the carrier symbols output from the mapping unit 204 corresponding to each layer, and outputs them to the time-frequency interleaving unit 209.

[0089] The time-frequency interleaving unit 209 performs interleaving in the time direction and the frequency direction on the carrier symbols output from the hierarchical synthesis unit 208, and outputs them to the OFDM frame configuration unit 210.

[0090] The OFDM frame configuration unit 210 adds the data signal, pilot signal, and TMCC signal of LLch to the input carrier symbols to configure an OFDM frame, and outputs it to the IFFT·GI addition unit 211.

[0091] The IFFT·GI addition unit 211 performs IFFT and GI addition on the OFDM frame output from the OFDM frame configuration unit 210, and outputs it to the transmitter 30.

[0092] As described above, in this embodiment, the data signal of the A layer is allocated only to the primary ch and not to the secondary ch. Therefore, the modulation device 20s corresponding to the secondary ch does not have to include the error correction encoding unit 202, the bit interleaving unit 203, and the mapping unit 204 corresponding to the A layer.

[0093] FIG. 8 is a diagram schematically showing the operation up to the configuration of the OFDM frame by the modulation device 20 shown in FIG. 7. In FIG. 8, the number of segments is 35, the number of segments of the A layer is 4, and the case where the data signal of the A layer is transmitted in the partial reception band of the primary ch will be described as an example. Also, in FIG. 8, the two-layer hierarchical transmission of the A layer and the B layer will be described as an example.

[0094] The data signal (A layer stream) of the A layer is allocated to 4 segments of the primary ch and not to the secondary ch. Therefore, the data signal (B layer stream) of the B layer is distributed to 31 segments of the primary ch and 35 segments of the secondary ch.

[0095] The mapping unit 204 generates carrier symbols from the data signals allocated to the primary ch and the secondary ch, respectively.

[0096] The hierarchical synthesis unit 208 of the modulation device 20p corresponding to the primary ch synthesizes (hierarchical synthesis) the carrier symbols of the A layer and the carrier symbols of the B layer.

[0097] The time-frequency interleaving unit 209 of the modulation device 20p divides the carrier symbol after hierarchical synthesis into a 9-segment band (partial reception band) including the carrier symbols of layer A and the carrier symbols of layer B, and the remaining 26-segment band (band division). The time-frequency interleaving unit 209 performs interleaving in the time direction and the frequency direction (time-frequency IL) for each divided band, and synthesizes the carrier symbols after interleaving (band synthesis). Since only the data signal of layer B is allocated to the secondary ch, the above-described hierarchical synthesis and band division are unnecessary. The time-frequency interleaving unit 209 of the modulation device 20s corresponding to the secondary ch performs interleaving on the carrier symbols for 35 segments together.

[0098] The OFDM frame configuration unit 210 of the modulation device 20p configures (OFDM framing) an OFDM frame in which the carrier symbols of layer A and the carrier symbols of layer B interleaved with the carrier symbols of layer A are arranged in the 9 segments (partial reception band) at the center of the band of the primary ch, and the remaining carrier symbols of layer B allocated to the primary ch are arranged in the other segments, as shown in FIG. 8, from the carrier symbols after interleaving. Also, the OFDM frame configuration unit 210 of the modulation device 20s configures an OFDM frame in which the carrier symbols of layer B are arranged in the entire band of the secondary ch from the carrier symbols after interleaving.

[0099] Next, the configuration of the demodulation device 50 as the receiving device according to the present invention will be described. The demodulation device 50 according to the present embodiment receives the broadcast wave transmitted from the multiplexing device 10 as the transmitting device according to the present invention via the modulation device 20 and the transmitter 30 via the receiver 40, and acquires the data signals of each layer from the received signal. FIG. 9 is a diagram showing a configuration example of the demodulation device 50 according to the present embodiment.

[0100] As shown in FIG. 9, the demodulator 50 according to this embodiment includes tuners 501 and 502, GI removal / FFT units 503 and 504, OFDM frame synchronization units 505 and 506, TMCC demodulation units 507 and 508, pilot extraction units 509 and 510, channel estimation units 511 and 512, waveform equalization units 513 and 514, deinterleaving / LLR (Log Likelihood Ratio) calculation / error correction decoding units 515 and 516, LLch demodulation / error correction decoding units 517 and 518, a CB synthesis output unit 519, a CB transmission determination unit 520, a secondary ch determination unit 521, and a P / S synchronization unit 522. The CB transmission determination unit 520 is an example of a determination unit. The secondary ch determination unit 521 is an example of a control unit.

[0101] The tuner 501, which is one of the plurality of tuners, receives the received signal of the receiver 40p that receives a broadcast wave. The tuner 501 selects and acquires the signal of the specified physical ch from the input received signal. The tuner 501 performs A / D conversion on the acquired signal and outputs the A / D converted signal to the GI removal / FFT unit 503.

[0102] The GI removal / FFT unit 503 performs GI removal and FFT on the output signal of the tuner 501 and outputs the obtained OFDM frame to the OFDM frame synchronization unit 505.

[0103] The OFDM frame synchronization unit 505 outputs the OFDM frame output from the GI removal / FFT unit 503 to the TMCC demodulation unit 507, the pilot extraction unit 509, and the LLch demodulation / error correction decoding unit 517.

[0104] The TMCC demodulation unit 507 demodulates the TMCC signal arranged on the TMCC carrier from the OFDM frame output from the OFDM frame synchronization unit 505, and acquires the TMCC information included in the TMCC signal. In this way, the TMCC demodulation unit 507 extracts the TMCC information from the received signal of the tuner 501. The TMCC demodulation unit 507 outputs the extracted TMCC information to the CB transmission determination unit 520. Also, based on the extracted TMCC information, the TMCC demodulation unit 507 indicates the positions of the pilot carriers where the pilot signals are arranged.

[0105] The pilot extraction unit 509 extracts the pilot signal arranged on the pilot carrier indicated by the TMCC demodulation unit 507 from the OFDM frame output from the OFDM frame synchronization unit 505. The pilot extraction unit 509 outputs the extracted pilot signal to the channel estimation unit 511. Also, the pilot extraction unit 509 outputs the OFDM frame input from the OFDM frame synchronization unit 505 to the waveform equalization unit 513.

[0106] The channel estimation unit 511 performs channel estimation using the pilot signal output from the pilot extraction unit 509, and outputs the estimated value to the waveform equalization unit 513.

[0107] Based on the estimated value output from the channel estimation unit 511, the waveform equalization unit 513 corrects (equalizes) the distortion of the signal generated in the transmission path with respect to the OFDM frame output from the channel estimation unit 511, and outputs the equalized signal to the deinterleave·LLR calculation·error correction decoding unit 515.

[0108] The deinterleave·LLR calculation·error correction decoding unit 515 performs deinterleaving opposite to the interleaving performed by the modulation device 20 on the output signal of the waveform equalization unit 513, and calculates the LLR (Log likelihood ratio) for each bit. The deinterleave·LLR calculation·error correction decoding unit 515 performs error correction decoding of the signal after deinterleaving using the calculated LLR, and acquires the data signals of each layer.

[0109] In this embodiment, the data signal of the A layer is assigned only to the primary ch. Therefore, the deinterleaving·LLR calculation·error correction decoding unit 515 can obtain the data signal of the A layer from the output signal of the waveform equalization unit 513. The deinterleaving·LLR calculation·error correction decoding unit 515 outputs the obtained data signal of the A layer to the outside. On the other hand, since the data signals of other layers are distributed to the primary ch and the secondary ch, the data signals of other layers cannot be demodulated only from the output signal of the waveform equalization unit 513. Therefore, the deinterleaving·LLR calculation·error correction decoding unit 515 outputs the data signals of other layers other than the A layer to the CB synthesis output unit 519.

[0110] Also, as described with reference to FIG. 3, when CB transmission is performed, the CB TLV-SI packet is multiplexed into the XMI packet of each layer. The deinterleaving·LLR calculation·error correction decoding unit 515 obtains the CB TLV-SI packet (CB control information) multiplexed into the XMI packet of each layer. The deinterleaving·LLR calculation·error correction decoding unit 515 outputs the obtained CB control information to the secondary ch discrimination unit 521.

[0111] The LLch demodulation·error correction decoding unit 517 extracts the carriers in which the data of the LLch are arranged from the OFDM frame output from the OFDM frame synchronization unit 505 and demodulates the data of the LLch. The LLch demodulation·error correction decoding unit 517 performs error correction decoding on the demodulated signal to obtain the data signal of the LLch. As described with reference to FIG. 3, when CB transmission is performed, the CB TLV-SI packet is multiplexed into the data of the LLch. The LLch demodulation·error correction decoding unit 517 obtains the data signal of the LLch and the CB control information multiplexed into the data signal of the LLch. The LLch demodulation·error correction decoding unit 517 outputs the obtained data signal of the LLch to the CB synthesis output unit 519 and outputs the obtained CB control information to the secondary ch discrimination unit 521.

[0112] The operations of the tuner 502, the GI removal / FFT unit 504, the OFDM frame synchronization unit 506, the TMCC demodulation unit 508, the pilot extraction unit 510, the channel estimation unit 512, the waveform equalization unit 514, the deinterleave / LLR calculation / error correction decoding unit 516, and the LLch demodulation / error correction decoding unit 518 are the same as those of the tuner 501, the GI removal / FFT unit 503, the OFDM frame synchronization unit 505, the TMCC demodulation unit 507, the pilot extraction unit 509, the channel estimation unit 511, the waveform equalization unit 513, the deinterleave / LLR calculation / error correction decoding unit 515, and the LLch demodulation / error correction decoding unit 517, respectively, except that the processing target is the received signal of the receiver 40s. Therefore, the description thereof is omitted. However, the TMCC demodulation unit 508 does not output the extracted TMCC information to the CB transmission determination unit 520. Also, the deinterleave / LLR calculation / error correction decoding unit 516 and the LLch demodulation / error correction decoding unit 518 do not output the control information for CB to the secondary ch determination unit 521.

[0113] When CB transmission is performed, the CB synthesis output unit 519 synthesizes and outputs the data signals of other layers (layer B and layer C) other than layer A output from the deinterleave / LLR calculation / error correction decoding units 515 and 516. As described above, the XMI packets of layer B and layer C are transmitted by being distributed to two systems. Therefore, the CB synthesis output unit 519 appropriately rearranges and outputs the data signals of each layer output from the deinterleave / LLR calculation / error correction decoding units 515 and 516 by a process reverse to the allocation to the two systems of the XMI packets of layer B and layer C. Also, when CB transmission is performed, the CB synthesis output unit 519 synthesizes and outputs the data signals of LLch output from the LLch demodulation / error correction decoding units 517 and 518.

[0114] The CB transmission determination unit 520 refers to the CB flag included in the TMCC information output from the TMCC demodulation unit 507, determines whether CB transmission is being performed on the physical channel received via the tuner 501, which is one of the plurality of tuners, and outputs the determination result to the secondary channel determination unit 521. For example, the CB transmission determination unit 520 scans across the frequency bands of all physical channels and refers to the CB flag superimposed on the TMCC information during the initial scan for detecting receivable channels, and determines whether CB transmission is being performed on each physical channel. Thus, in the present embodiment, by superimposing the CB flag indicating whether CB transmission is being performed on the TMCC information, the CB transmission determination unit 520 can determine whether CB transmission is being performed without demodulating the data signals of each layer or the data signal of the LL channel.

[0115] When the secondary channel determination unit 521 determines that CB transmission is being performed by the CB transmission determination unit 520, after the completion of the initial scan, it acquires the frequency information of the physical channel received by the tuner 501 and the physical channels constituting the CB transmission. Specifically, the secondary channel determination unit 521 refers to the CB control information output from at least one of the deinterleaving·LLR calculation·error correction decoding unit 515 and the LL channel demodulation·error correction decoding unit 517, and acquires the frequency information of the two physical channels that form a pair constituting the CB transmission.

[0116] When CB transmission is being performed on the physical channel on which the tuner 501 receives the broadcast wave, the secondary channel determination unit 521 activates the tuner 502, which is a tuner other than the tuner 501 among the plurality of tuners, and adjusts the reception frequency of the tuner 502 to the frequency of the physical channel paired with the physical channel received by the tuner 501. By doing so, the broadcast waves transmitted on the primary channel and the secondary channel can be received.

[0117] However, in this embodiment, the data signal of the A layer is transmitted only on the primary ch and not on the secondary ch. Therefore, when receiving only the data signal of the A layer, even if CB transmission is being performed, it is not necessary to activate the tuner 502 in order to receive the broadcast wave transmitted via the secondary ch. Accordingly, when the secondary ch discrimination unit 521 receives the data signal of a specific layer (A layer), it activates the tuner 501 to receive the signal transmitted via one physical ch (primary ch) (without activating the tuner 502). Further, when the secondary ch discrimination unit 521 receives the data signal of a layer other than the specific layer (B layer and C layer), it activates the tuner 501 to receive the signal transmitted via one physical ch (primary ch) and activates the tuner 502 to receive the signal transmitted via the other physical ch (secondary ch). By doing so, when receiving the data signal of the A layer, even if CB transmission is being performed, it is only necessary to activate one tuner 501, so that power saving can be achieved.

[0118] Further, when CB transmission is performed on the physical ch on which the secondary ch discrimination unit 521 receives the broadcast wave with the tuner 501, the OFDM frame synchronization unit 505 and the OFDM frame synchronization unit 506 are synchronized. As described above, the primary ch and the secondary ch emit the broadcast wave at the same timing. By synchronizing the OFDM frame synchronization unit 505 and the OFDM frame synchronization unit 506, the demodulation timings of the primary ch and the secondary ch can be matched.

[0119] Next, the case where CB transmission in the MIMO like mode is performed will be described.

[0120] FIG. 10 is a diagram showing a configuration example of the transmission / reception system 1 according to an embodiment of the present invention when CB transmission in the MIMO like mode is performed. In FIG. 10, the same components as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

[0121] The transmission / reception system 1 shown in FIG. 10 includes a remultiplexing device 10, a modulation device 70, two transmitters 30 (transmitters 30p and 30s), two receivers 40 (receivers 40p and 40s), and a demodulation device 80 as a reception device.

[0122] In the transmission / reception system 1 shown in FIG. 10, the remultiplexing device 10 outputs a multiplexed frame (XMI packet) in which the data signals of each layer of hierarchical transmission and the data signal of LLch are multiplexed into one system to the modulation device 70.

[0123] The modulation device 70 divides the multiplexed frame output from the remultiplexing device 10 into two systems corresponding to the primary ch and the secondary ch, and configures an OFDM frame in which the data signals of each layer of hierarchical transmission, the data signal of LLch, the TMCC signal, etc. are arranged on predetermined carriers, and outputs it to the transmitters 30p and 30s.

[0124] When CB transmission is being performed, the demodulation device 80 demodulates the reception signals of the receiver 40p and the receiver 40s, and outputs the data signals of each layer and the data signal of LLch that have been transmitted via the primary ch and the secondary ch, respectively.

[0125] Next, the configuration of the modulation device 70 as a transmission device according to the present embodiment will be described. FIG. 11 is a diagram showing a configuration example of the modulation device 70 according to the present embodiment.

[0126] The modulation device 70 shown in FIG. 11 includes an input I / F unit 701, an error correction encoding unit 702, a bit interleaving unit 703, a mapping unit 704, system separation units 705 and 706, a pilot signal generation unit 707, a primary ch TMCC information bit generation unit 708, a secondary ch TMCC information bit generation unit 709, a primary ch TMCC signal generation unit 710, a secondary ch TMCC signal generation unit 711, hierarchical synthesis units 712 and 713, time / frequency interleaving units 714 and 715, OFDM frame configuration units 716 and 717, and IFFT / GI addition units 718 and 719. The error correction encoding unit 702, the bit interleaving unit 703, and the mapping unit 704 are provided corresponding to each of the A layer, the B layer, and the C layer. However, in FIG. 11, for simplicity of the figure, only the configuration corresponding to the A layer is shown. The hierarchical synthesis unit 712, the time / frequency interleaving unit 714, the OFDM frame configuration unit 716, and the IFFT / GI addition unit 718 are provided corresponding to the primary ch. The hierarchical synthesis unit 713, the time / frequency interleaving unit 715, the OFDM frame configuration unit 717, and the IFFT / GI addition unit 719 are provided corresponding to the secondary ch.

[0127] The input I / F unit 701 receives, from the demultiplexing device 10, a multiplexed frame in which the XMI packets of each layer, the XMI packet of the LLch, the synchronization control XMI packet, and the staff XMI packet are multiplexed into one system. The input I / F unit 701 extracts the data signals of each layer from the input multiplexed frame and outputs them to the error correction encoding unit 702 of the corresponding layer. The input I / F unit 701 extracts the data signal of the LLch from the input multiplexed frame and outputs it to the OFDM frame configuration unit 716 and the OFDM frame configuration unit 717. The input I / F unit 701 extracts the TMCC information from the input multiplexed frame and outputs it to the pilot signal generation unit 707, the primary ch TMCC information bit generation unit 708, and the secondary ch TMCC information bit generation unit 709.

[0128] The error correction encoding unit 702 performs error correction encoding on the input data signal of layer A (layer A XMI packet) in units of FEC blocks and outputs it to the bit interleaving unit 703.

[0129] The bit interleaving unit 703 performs interleaving on the data sequence output from the error correction encoding unit 702 in units of bits. Examples of bit-level interleaving include bit rotation, which blocks a bit sequence in a predetermined unit and changes the bit order within each block. The bit interleaving unit 703 outputs the interleaved data sequence to the mapping unit 704.

[0130] Based on the modulation method of the corresponding layer, the mapping unit 704 maps the data sequence output from the bit interleaving unit 703 onto the I-Q plane for each predetermined number of bits to perform carrier modulation. In this way, the mapping unit 704 converts the data sequence into carrier symbols. The mapping unit 704 outputs the generated carrier symbols to the layer synthesis unit 712.

[0131] The system separation unit 705 receives a carrier symbol obtained by carrier-modulating a data signal of the B layer from the mapping unit 704 provided corresponding to the B layer. The system separation unit 705 separates the input carrier symbol into two systems (a first system corresponding to the primary ch and a second system corresponding to the secondary ch). The system separation unit 705 outputs the carrier symbol of the first system to the hierarchical synthesis unit 712 and outputs the carrier symbol of the second system to the hierarchical synthesis unit 713. The system separation unit 706 receives a carrier symbol obtained by carrier-modulating a data signal of the C layer from the mapping unit 704 provided corresponding to the C layer. The system separation unit 706 separates the input carrier symbol into two systems (a first system and a second system). The system separation unit 706 outputs the carrier symbol of the first system to the hierarchical synthesis unit 712 and outputs the carrier symbol of the second system to the hierarchical synthesis unit 713. Thus, in the present embodiment, among a plurality of layers, the data signal of a specific layer (A layer) is allocated to a system corresponding to one of the two physical channels (primary ch and secondary ch) (primary ch). Also, the data signals of each of the layers other than the specific layer (B layer and C layer) are respectively distributed to each of the two systems corresponding to the two physical channels.

[0132] Based on the input TMCC information, the pilot signal generation unit 707 generates a pilot signal to be incorporated into the OFDM frame and outputs it to the OFDM frame configuration unit 716 and the OFDM frame configuration unit 717.

[0133] The primary ch TMCC information bit generation unit 708 generates TMCC information bits for generating a TMCC signal to be transmitted on the primary ch based on the input TMCC information. Here, the primary ch TMCC information bit generation unit 708 superimposes a CB flag indicating whether to perform CB transmission on the TMCC information to generate TMCC information bits. Also, the primary ch TMCC information bit generation unit 708 turns on the partial reception flag to generate TMCC information bits. The primary ch TMCC information bit generation unit 708 outputs the generated TMCC information bits to the primary ch TMCC signal generation unit 710. The secondary ch TMCC information bit generation unit 709 generates TMCC information bits for generating a TMCC signal to be transmitted on the secondary ch based on the input TMCC information. Here, the secondary ch TMCC information bit generation unit 709 superimposes a CB flag indicating whether to perform CB transmission on the TMCC information to generate TMCC information bits. Also, the secondary ch TMCC information bit generation unit 709 turns off the partial reception flag to generate TMCC information bits. The secondary ch TMCC information bit generation unit 709 outputs the generated TMCC information bits to the secondary ch TMCC signal generation unit 711.

[0134] The primary ch TMCC signal generation unit 710 generates a TMCC signal to be transmitted on the primary ch based on the TMCC information bits output from the primary ch TMCC information bit generation unit 708, and outputs it to the OFDM frame configuration unit 716. The secondary ch TMCC signal generation unit 711 generates a TMCC signal to be transmitted on the secondary ch based on the TMCC information bits output from the secondary ch TMCC information bit generation unit 709, and outputs it to the OFDM frame configuration unit 717.

[0135] The hierarchical synthesis unit 712 hierarchically synthesizes the carrier symbols output from the mapping unit 704 corresponding to the A layer, the carrier symbols output from the demultiplexing unit 705 corresponding to the B layer, and the carrier symbols output from the demultiplexing unit 706 corresponding to the C layer, and outputs them to the time-frequency interleaving unit 714. The hierarchical synthesis unit 713 hierarchically synthesizes the carrier symbols output from the demultiplexing unit 705 corresponding to the B layer and the carrier symbols output from the demultiplexing unit 706 corresponding to the C layer, and outputs them to the time-frequency interleaving unit 715.

[0136] The time-frequency interleaving unit 714 performs interleaving in the time direction and the frequency direction on the carrier symbols output from the hierarchical synthesis unit 712, and outputs them to the OFDM frame configuration unit 716. The time-frequency interleaving unit 715 performs interleaving in the time direction and the frequency direction on the carrier symbols output from the hierarchical synthesis unit 713, and outputs them to the OFDM frame configuration unit 717.

[0137] The OFDM frame configuration unit 716 adds the data signal, pilot signal, and TMCC signal of LLch to the input carrier symbols to configure an OFDM frame, and outputs it to the IFFT·GI addition unit 718. The OFDM frame configuration unit 717 adds the data signal, pilot signal, and TMCC signal of LLch to the input carrier symbols to configure an OFDM frame, and outputs it to the IFFT·GI addition unit 719.

[0138] The IFFT·GI addition unit 718 performs IFFT and GI addition on the OFDM frame output from the OFDM frame configuration unit 716, and outputs it to the transmitter 30p. The IFFT·GI addition unit 719 performs IFFT and GI addition on the OFDM frame output from the OFDM frame configuration unit 717, and outputs it to the transmitter 30s.

[0139] FIG. 12 is a diagram schematically showing the operation up to the configuration of an OFDM frame by the modulation device 70 shown in FIG. 11. In FIG. 12, the number of segments is 35, the number of segments of the A layer is 4, and the case where the data signal of the A layer is transmitted in the partial reception band of the primary ch will be described as an example. Also, in FIG. 12, the two-layer hierarchical transmission of the A layer and the B layer will be described as an example.

[0140] The data signal (A layer stream) of the A layer is allocated to 4 segments of the primary ch and not allocated to the secondary ch. Therefore, the data signal (B layer stream) of the B layer is distributed to 31 segments of the primary ch and 35 segments of the secondary ch.

[0141] The mapping unit 204 corresponding to the A layer generates symbol carriers for 4 segments allocated to the primary ch. Also, the mapping unit 204 corresponding to the B layer generates symbol carriers for 66 segments, which are the 31 segments of the primary ch excluding the 4 segments allocated to the A layer and the 35 segments of the secondary ch.

[0142] The system separation unit 705 divides the symbol carriers for 66 segments into carrier symbols for 31 segments and carrier symbols for 35 segments as shown in FIG. 12. The system separation unit 705 outputs the carrier symbols for 31 segments to the layer synthesis unit 712 corresponding to the primary ch. Also, the system separation unit 705 outputs the carrier symbols for 35 segments to the layer synthesis unit 713 corresponding to the secondary ch. Hereinafter, as described with reference to FIG. 8, layer synthesis, band division, frequency / time IL, and band synthesis are performed, and an OFDM frame is configured.

[0143] Next, the configuration of the demodulation device 80 as a receiving device according to the present invention when CB transmission in the MIMO like mode is performed will be described with reference to FIG. 13. In FIG. 13, the same components as those in FIG. 9 are denoted by the same reference numerals, and the description thereof will be omitted.

[0144] As shown in FIG. 13, the demodulator 80 according to the present embodiment includes tuners 501 and 502, GI removal / FFT units 503 and 504, OFDM frame synchronization units 505 and 506, TMCC demodulation units 507 and 508, pilot extraction units 509 and 510, channel estimation units 511 and 512, waveform equalization units 513 and 514, LLch demodulation / error correction decoding units 517 and 518, CB transmission determination unit 520, secondary ch determination unit 521, P / S synchronization unit 522, time / frequency deinterleaving units 801 and 802, synthesis unit 803, LLR calculation / error correction decoding units 804 and 806, and output unit 805. The demodulator 80 shown in FIG. 13 is different from the demodulator 50 shown in FIG. 9 in that the deinterleaving / LLR calculation / error correction decoding units 515 and 516 are deleted, the time / frequency deinterleaving units 801 and 802, the synthesis unit 803, and the LLR calculation / error correction decoding units 804 and 806 are added, and the CB synthesis output unit 519 is changed to the output unit 805.

[0145] The time / frequency deinterleaving unit 801 performs deinterleaving opposite to the interleaving performed by the time / frequency interleaving unit 714 of the modulator 70 on the output signal of the waveform equalization unit 513. As described above, in the present embodiment, the data signal of the A layer is assigned only to the primary ch. Therefore, the data signal of the A layer can be demodulated only by the output signal of the waveform equalization unit 513. Therefore, the time / frequency deinterleaving unit 801 outputs the data signal of the A layer to the LLR calculation / error correction decoding unit 806. On the other hand, since the data signals of other layers are distributed to the primary ch and the secondary ch, the data signals of other layers cannot be demodulated only from the output signal of the waveform equalization unit 513. Therefore, the time / frequency deinterleaving unit 801 outputs the data signals of other layers other than the A layer to the synthesis unit 803. The time / frequency deinterleaving unit 802 performs deinterleaving opposite to the interleaving performed by the time / frequency interleaving unit 715 of the modulator 70 on the output signal of the waveform equalization unit 514 and outputs it to the synthesis unit 803.

[0146] The combining unit 803 combines the output signals of the time-frequency deinterleaving unit 801 and the time-frequency deinterleaving unit 802 by a process opposite to that of the system separation units 705 and 706 of the modulation device 70, and outputs the result to the LLR calculation and error correction decoding unit 804.

[0147] The LLR calculation and error correction decoding unit 804 calculates the LLR for each bit of the output signal of the combining unit 803, and uses the calculated LLR to perform error correction decoding of the output signal of the combining unit 803 to obtain the data signals of each layer. The LLR calculation and error correction decoding unit 804 outputs the obtained data signals of each layer to the output unit 805.

[0148] The output unit 805 outputs the data signals of the B layer and the C layer output from the LLR calculation and error correction decoding unit 804 and the data signals of the LLch output from the LLch demodulation and error correction decoding units 517 and 518.

[0149] The LLR calculation and error correction decoding unit 806 calculates the LLR for each bit of the output signal of the time-frequency deinterleaving unit 801, and uses the calculated LLR to perform error correction decoding of the output signal of the time-frequency deinterleaving unit 802 to obtain the data signal of the A layer. The LLR calculation and error correction decoding unit 806 outputs the obtained data signal of the A layer to the outside.

[0150] In the demodulation device 80 shown in FIG. 13, the data signal of the A layer can be obtained only from the received signal via the primary ch. Therefore, the CB TLV-SI may be multiplexed on the data signal of the A layer. In this case, the LLR calculation and error correction decoding unit 806 may obtain the CB TLV-SI (CB control information) multiplexed on the data signal of the A layer and output it to the secondary ch determination unit 521. Therefore, the demodulation device 80 shown in FIG. 13 can obtain the CB control information by receiving only the signal of one physical ch.

[0151] In FIG. 11, an example was described in which carrier symbols generated by the mapping unit 704 corresponding to the B layer and the C layer are distributed by the system separation units 705 and 706 to two systems corresponding to the primary ch and the secondary ch. However, the present invention is not limited to this.

[0152] FIG. 14 is a diagram showing another configuration example of the modulation device 70. In FIG. 14, the same components as those in FIGS. 7 and 11 are denoted by the same reference numerals, and the description thereof is omitted.

[0153] The modulation device 70 shown in FIG. 14 includes an input I / F unit 701, an error correction coding unit 202, a bit interleaving unit 203, a mapping unit 204, a pilot signal generation unit 707, a primary ch TMCC information bit generation unit 708, a secondary ch TMCC information bit generation unit 709, a primary ch TMCC signal generation unit 710, a secondary ch TMCC signal generation unit 711, a layer synthesis unit 208, a time / frequency interleaving unit 209, OFDM frame configuration units 716 and 717, IFFT / GI addition units 718 and 719, and a system separation unit 720.

[0154] The system separation unit 720 is provided between the time / frequency interleaving unit 209 and the OFDM frame configuration units 716 and 717. The system separation unit 720 separates the carrier symbols output from the time / frequency interleaving unit 209 into two systems (a first system and a second system). The system separation unit 720 outputs the carrier symbols of the first system corresponding to the primary ch to the OFDM frame configuration unit 716, and outputs the carrier symbols of the second system corresponding to the secondary ch to the OFDM frame configuration unit 717. Here, the system separation unit 720 allocates the carrier symbols of the A layer only to the first system, and allocates the carrier symbols of the B layer and the C layer to the first system and the second system.

[0155] FIG. 15 is a diagram schematically showing the operation up to the configuration of an OFDM frame by the modulation device 70 shown in FIG. 14. In FIG. 15, the number of segments is 35, the number of segments in the A layer is 4, and the case where the data signal in the A layer is transmitted in the partial reception band of the primary ch will be described as an example. Also, in FIG. 15, the two-layer hierarchical transmission of the A layer and the B layer will be described as an example.

[0156] The layer synthesis unit 208 synthesizes (layer synthesis) the carrier symbols of the A layer assigned to the 4 segments of the primary ch and the carrier symbols of the B layer assigned to the 31 segments of the primary ch and the 35 segments of the secondary ch.

[0157] The time-frequency interleaving unit 209 divides the carrier symbols after layer synthesis into a band (partial reception band) for 9 segments including the carrier symbols of the A layer and the carrier symbols of the B layer, and a band for the remaining 61 segments (band division). The time-frequency interleaving unit 209 performs interleaving in the time direction and the frequency direction (time-frequency IL) for each divided band.

[0158] The system separation unit 720 divides the carrier symbols of the B layer after interleaving into carrier symbols for 26 segments (= 35 - 4 (A layer) - 5 (layers)) that can be assigned to the primary ch and carrier symbols for 35 segments that can be assigned to the secondary ch. The system separation unit 720 synthesizes (band synthesis) the carrier symbols for 9 segments that are the partial reception band and the carrier symbols for 26 segments, and outputs them to the OFDM frame configuration unit 716. Also, the system separation unit 720 outputs the carrier symbols of the M layer for 35 segments to the OFDM frame configuration unit 717.

[0159] The OFDM frame configuration unit 716 forms (OFDM frames) an OFDM frame in which, as shown in FIG. 15, A-layer carrier symbols and B-layer carrier symbols interleaved with the A-layer carrier symbols are arranged in the nine segments (partial reception bands) at the center of the band of the primary ch from the carrier symbols after band synthesis by the system separation unit 720, and B-layer carrier symbols are arranged in the remaining segments. Further, the OFDM frame configuration unit 717 forms an OFDM frame in which B-layer carrier symbols are arranged over the entire band of the secondary ch from the carrier symbols after band synthesis by the system separation unit 720, as shown in FIG. 15.

[0160] FIG. 16 is a diagram showing another configuration example of the demodulation device 80. The demodulation device 80 shown in FIG. 16 receives the broadcast wave transmitted by the modulation device 70 shown in FIG. 14.

[0161] The demodulation device 80 shown in FIG. 16 has a different arrangement of the combining unit 803 compared to the demodulation device 80 shown in FIG. 13.

[0162] In FIG. 16, the waveform equalization unit 513 outputs the A-layer signal obtained from the equalized signal to the time / frequency deinterleaving unit 801, and outputs the B-layer and C-layer signals to the combining unit 803.

[0163] The combining unit 803 combines the signals of the B layer and the C layer output from the waveform equalization unit 513 and the waveform equalization unit 514 for each layer, and outputs the combined signal to the time-frequency deinterleaving unit 802. The time-frequency deinterleaving unit 802 performs deinterleaving reverse to the interleaving performed by the time-frequency interleaving unit 209 of the modulation device 70 on the output signal of the combining unit 803, and outputs it to the LLR calculation / error correction decoding unit 804. The LLR calculation / error correction decoding unit 804 calculates the LLR for each bit of the output signal of the time-frequency deinterleaving unit 802, and performs error correction decoding of the output signal of the time-frequency deinterleaving unit 802 using the calculated LLR to obtain the data signals of the B layer and the C layer. The LLR calculation / error correction decoding unit 804 outputs the obtained data signals of the B layer and the C layer to the output unit 805.

[0164] The LLR calculation / error correction decoding unit 806 calculates the LLR for each bit of the output signal of the time-frequency deinterleaving unit 801, and performs error correction decoding of the output signal of the time-frequency deinterleaving unit 802 using the calculated LLR to obtain the data signal of the A layer. The LLR calculation / error correction decoding unit 806 outputs the obtained data signal of the A layer to the outside.

[0165] Also in the demodulation device 80 shown in FIG. 16, the data signal of the A layer can be obtained only from the received signal via the primary ch. Therefore, the CB TLV-SI may be multiplexed on the data signal of the A layer. In this case, the LLR calculation / error correction decoding unit 806 may obtain the CB TLV-SI multiplexed on the data signal of the A layer and output it to the secondary ch discrimination unit 521. Thus, the demodulation device 80 shown in FIG. 16 can obtain the CB control information only by receiving the signal of one physical ch.

[0166] Thus, in this embodiment, the transmitting apparatus allocates the data signal of a specific layer among a plurality of layers to a system corresponding to one physical channel out of the plurality of physical channels constituting the CB transmission, and distributes the data signals of the layers other than the specific layer to the respective systems corresponding to the plurality of physical channels. When receiving the data signal of the specific layer, the receiving apparatus activates Tuner 501, which is one of the plurality of tuners, to receive the signal transmitted via one physical channel. Further, when receiving the data signals of the layers other than the specific layer, the receiving apparatus activates Tuner 501 to receive the signal transmitted via one physical channel, and also activates Tuner 502, which is a tuner other than Tuner 501 among the plurality of tuners, to receive the signal transmitted via the other physical channel.

[0167] By doing so, when CB-transmitting the data signals of a plurality of layers, for a specific layer among the plurality of layers, it is possible to receive by activating only one tuner 501 without activating both of the two tuners 501 and 502. Therefore, when CB-transmitting the data signals of a plurality of layers, power saving in the receiving apparatus can be achieved.

[0168] (Second Embodiment) In the first embodiment, the example in which the demultiplexer 10 performs the distribution of the data signals of each layer, the generation of the CB flag (flag information) and the CB control information, the superimposition of the CB flag on the TMCC information, and the multiplexing of the CB control information on the data signal (main line signal or data signal of the LLch) has been described, but the present invention is not limited to this.

[0169] FIG. 17 is a diagram showing a configuration example of a transmission / reception system 1' according to the second embodiment of the present invention. In FIG. 17, the same components as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

[0170] As shown in FIG. 17, the transmission and reception system 1' according to the present embodiment includes demultiplexing devices 10p and 10s, modulation devices 20p and 20s, transmitters 30p and 30s, receivers 40p and 40s, demodulation devices 50p and 50s, a combining unit 7, and a control device 90. The demultiplexing device 10p, the modulation device 20p, the transmitter 30p, the receiver 40p, and the demodulation device 50p are provided corresponding to the primary ch. The demultiplexing device 10s, the modulation device 20s, the transmitter 30s, the receiver 40s, and the demodulation device 50s are provided corresponding to the secondary ch.

[0171] The demultiplexing devices 10p and 10s have the same configuration as the conventional demultiplexing device 10a that does not support CB transmission. However, the demultiplexing devices 10p and 10s multiplex the XMI packets, L0 symbols, L1 symbols, synchronization control XMI packets, and staff XMI packets of each layer into one stream and output them to the corresponding modulation devices 20p and 20s. That is, unlike the demultiplexing device 10a shown in FIG. 2, the output destinations of the demultiplexing devices 10p and 10s are one.

[0172] The control device 90 controls the transmission of data signals of a plurality of layers (for example, the above-described A layer, B layer, and C layer) with different resistances by CB transmission combining the primary ch and the secondary ch (combining a plurality of physical ch). As shown in FIG. 17, the control device 90 includes a splitting unit 91 and a control unit 92.

[0173] The splitting unit 91 distributes the packets transmitted by the primary ch and the secondary ch. FIG. 18 is a diagram showing a configuration example of the splitting unit 91.

[0174] As shown in FIG. 18, the splitting unit 91 includes a B layer packet distribution unit 912, a C layer packet distribution unit 913, an L0 symbol distribution unit 914, and an L1 symbol distribution unit 915.

[0175] The B-layer packet distribution unit 912 receives a B-layer packet and control information related to the distribution of the packet output from the control unit 92. Based on the control information, the B-layer packet distribution unit 912 switches the output destination of the B-layer packet between the demultiplexer 10p and the demultiplexer 10s as shown in FIG. 19 and outputs it. In this way, the B-layer packet distribution unit 912 distributes the B-layer data to two systems corresponding to the primary ch and the secondary ch, respectively.

[0176] Similar to the B-layer packet distribution unit 912, the C-layer packet distribution unit 913 distributes the C-layer packet to the demultiplexer 10p and the demultiplexer 10s and outputs it.

[0177] In this way, the splitting unit 91 allocates the data signal of a specific layer (for example, the A layer) among the plurality of layers (the A layer, the B layer, and the C layer) to the system corresponding to one physical ch (the primary ch) among the plurality of physical chs, and distributes the data signals of the layers other than the specific layer to each of the plurality of systems corresponding to the plurality of physical channels.

[0178] The L0 symbol distribution unit 914 receives the L0 symbol. The L0 symbol distribution unit 914 outputs the input L0 symbol to the demultiplexer 10p and the demultiplexer 10s, respectively.

[0179] The L1 symbol distribution unit 915 receives the L1 symbol. The L1 symbol distribution unit 915 outputs the input L1 symbol to the demultiplexer 10p and the demultiplexer 10s, respectively.

[0180] Note that, as shown in FIG. 19, the splitting unit 91 may physically split the data signal, or may logically split it by, for example, changing the UDP port number associated with each channel after splitting.

[0181] Referring again to FIG. 17, the control unit 92 outputs control information related to packet distribution to the division unit 91. The control information related to distribution may be, but is not limited to, the number of segments transmitted for each layer in primary and secondary, the upper limit setting value of the bit rate for each channel, and the number ratio of packets to be distributed. Further, the control unit 92 generates a CB flag (flag information) indicating whether to perform CB transmission and CB control information including at least frequency information of a plurality of physical channels constituting the CB transmission. The control unit 92 outputs the generated CB flag and CB control information to the demultiplexer 10p and the demultiplexer 10s. The control unit 92 multiplexes the CB flag with the TMCC information related to the transmission of video and audio data and multiplexes the CB control information with at least one of the video and audio data and the data signal of the LLch in the demultiplexers 10p and 10s.

[0182] The demodulator 50p demodulates the received signal of the receiver 40p (data signal transmitted on the primary channel) and outputs it to the synthesizer 7. The demodulator 50s demodulates the received signal of the receiver 40s (data signal transmitted on the secondary channel) and outputs it to the synthesizer 7.

[0183] The synthesizer 7 synthesizes and outputs the data signal demodulated by the demodulator 50p and the data signal demodulated by the demodulator 50s. The operation of the synthesizer 7 is the same as, for example, the operation of the CB synthesis output unit 519 shown in FIG. 7.

[0184] By providing the control device 90 that performs the distribution of data signals, the generation of the CB flag and the CB control information, the multiplexing of the CB flag with the TMCC information, and the multiplexing of the CB control information with the data signal, as in this embodiment, existing equipment that does not support CB transmission can be used as the demultiplexers 10p and 10s.

[0185] In the above-described embodiments, an example has been described in which the audio and video data of each layer are remultiplexed and transmitted in the form of an XMI packet. However, the present invention is not limited to this, and it is applicable to any method in which data of different layers are packetized and the packets of each layer are remultiplexed and transmitted. Therefore, in the above-described embodiments, the descriptions of "XMI packet" and "XMI packetization" can be read as "remultiplexed packet" and "remultiplexing", respectively.

[0186] Although not particularly mentioned in the embodiments, a program may be provided that causes a computer to function as the remultiplexing device 10, the modulation device 70, the demodulation devices 50 and 80, or the control device 90. Further, the program may be recorded on a computer-readable medium. By using a computer-readable medium, it is possible to install the program on a computer. Here, the computer-readable medium on which the program is recorded may be a non-transitory recording medium. The non-transitory recording medium is not particularly limited, and may be, for example, a recording medium such as a CD-ROM or a DVD-ROM.

[0187] Alternatively, a chip may be provided that is composed of a memory that stores a program for executing each process performed by the remultiplexing device 10, the modulation device 70, the demodulation devices 50 and 80, or the control device 90, and a processor that executes the program stored in the memory, and is mounted on the remultiplexing device 10, the modulation device 70, the demodulation devices 50 and 80, or the control device 90.

[0188] Although the above-described embodiments have been described as representative examples, it is obvious to those skilled in the art that many changes and substitutions are possible within the spirit and scope of the present invention. Therefore, the present invention should not be construed as being limited by the above-described embodiments, and various modifications and changes are possible without departing from the scope of the claims. For example, it is possible to combine a plurality of constituent blocks described in the configuration diagrams of the embodiments into one, or to divide one constituent block.

Explanation of Reference Numerals

[0189] 1 Transmission and reception system 7 Combining unit 10, 10a, 10p, 10s Demultiplexing device 20, 20p, 20s, 70 Modulation device 30, 30p, 30s Transmitter 40, 40p, 40s Receiver 50, 50p, 50s, 80 Demodulation device 90 Control device 91 Splitting unit 92 Control unit 101, 108, 121 Packet filter 102, 109, 110 IP header compression unit 103, 111, 112 TLV packetization unit 104, 113, 114 FIFO buffer 105 FEC block configuration unit 106 Hierarchical frame configuration unit 107 XMI packetization unit 115 L0 symbol configuration unit 116 L1 symbol configuration unit 117 GPS reference signal generator 118, 118a Synchronization control XMI packet configuration unit 119 Staff XMI packet configuration unit 120, 120a XMI packet transmission scheduler unit 201 Input I / F unit 202 Error correction coding unit 203 Bit interleaving unit 204 Mapping unit 205 Pilot signal generation unit 206 TMCC information bit generation unit 207 TMCC signal generation unit 208 Hierarchical combining unit 209 Time-frequency interleaving unit 210 OFDM frame configuration unit 211 IFFT·GI addition unit 501, 502 Tuner 503, 504 GI removal·FFT unit 505,506 OFDM Frame Synchronization Unit 507,508 TMCC Demodulation Unit 509,510 Pilot Extraction Unit 511,512 Channel Estimation Unit 513,514 Waveform Equalization Unit 515,516 Deinterleave·LLR Calculation·Error Correction Decoding Unit 517,518 LLch Demodulation·Error Correction Decoding Unit 519 CB Composite Output Unit 520 CB Transmission Discrimination Unit 521 Secondary ch Discrimination Unit 522 P / S Synchronization Unit 701 Input I / F Unit 702 Error Correction Encoding Unit 703 Bit Interleave Unit 704 Mapping Unit 705,706 System Separation Unit 707 Pilot Signal Generation Unit 708 Primary ch TMCC Information Bit Generation Unit 709 Secondary ch TMCC Information Bit Generation Unit 710 Primary ch TMCC Signal Generation Unit 711 Secondary ch TMCC Signal Generation Unit 712,713 Hierarchical Composition Unit 714,715 Time·Frequency Interleave Unit 716,717 OFDM Frame Configuration Unit 718,719 IFFT·GI Addition Unit 720 System Separation Unit 801,802 Time·Frequency Deinterleave Unit 803 Composition Unit 804,806 LLR Calculation·Error Correction Decoding Unit 805 Output Unit 1201 A-Hierarchy XMI Packet Distribution Unit 1202 B-Hierarchy XMI Packet Distribution Unit 1203 C-Hierarchy XMI Packet Distribution Unit 1204 L0 Symbol Distribution Unit 1205 L1 Symbol Allocation Unit 1206 TLV-SI Packet Allocation Unit for CB 1207 Primary chXMI Transmission Scheduler Unit 1208 Secondary chXMI Transmission Scheduler Unit

Claims

1. A transmitting device that transmits data signals of a plurality of layers with different resistances by channel bonding transmission combining a plurality of physical channels, Among the plurality of layers, a data signal of a specific layer is allocated to a system corresponding to one of the plurality of physical channels, and data signals of each layer other than the specific layer are distributed to each of the plurality of systems corresponding to the plurality of physical channels, comprising a system separation unit, The system separation unit distributes data signals of layers other than the specific layer to the plurality of systems according to a ratio between data signals of layers other than the specific layer that can be allocated to the one physical channel and data signals of layers other than the specific layer that can be allocated to other physical channels than the one physical channel. A transmitting device.

2. A transmitting device that transmits data signals of a plurality of layers with different resistances by channel bonding transmission combining a plurality of physical channels, Among the plurality of layers, a data signal of a specific layer is allocated to a system corresponding to one of the plurality of physical channels, and data signals of each layer other than the specific layer are distributed to each of the plurality of systems corresponding to the plurality of physical channels, comprising a system separation unit, A first control information generation unit that generates TMCC information in which flag information indicating whether to perform channel bonding transmission in the physical channel is superimposed, A second control information generation unit that generates control information for channel bonding, including at least frequency information of a plurality of physical channels constituting the channel bonding transmission, further comprising: A TMCC signal generated based on the TMCC information is multiplexed on each of the plurality of systems, The control information for channel bonding is multiplexed on at least one of the data signals of the plurality of layers and low-latency data signals transmitted with lower latency than the data signals of the plurality of layers. A transmitting device.

3. In the transmitting device according to Claim 2, A transmitting device in which the control information for channel bonding is multiplexed with the data signal of the specific layer.

4. A receiving device that receives data signals of a plurality of layers with different resistances transmitted by channel bonding transmission combining a plurality of physical channels, Among the plurality of layers, the data signal of a specific layer is transmitted via one physical channel among the plurality of physical channels, and the data signals of the layers other than the specific layer are distributed to and transmitted by the plurality of physical channels, A plurality of tuners that receive signals transmitted via the physical channel, When receiving the data signal of the specific layer, one of the plurality of tuners is activated to receive the signal transmitted via the one physical channel, and when receiving the data signal of the layer other than the specific layer, the one tuner is activated to receive the signal transmitted via the one physical channel, and at the same time, a control unit that activates the tuners other than the one tuner among the plurality of tuners to receive the signals transmitted via the physical channels other than the one physical channel, The data signals of the plurality of layers are multiplexed with a TMCC signal including TMCC information and a low-latency data signal transmitted with lower latency than the data signals of the plurality of layers, The TMCC information is superimposed with flag information indicating whether or not to perform the channel bonding transmission in the physical channel, At least one of the data signals of the plurality of layers and the low-latency data signal is multiplexed with control information for channel bonding including at least the frequency information of the plurality of physical channels constituting the channel bonding transmission, Further comprising a determination unit that determines whether or not the channel bonding transmission is being performed on the one physical channel based on the flag information superimposed on the TMCC information included in the TMCC signal extracted from the received signal of the one tuner, When the control unit determines that channel bonding transmission is being performed by the determination unit and receives a data signal of a layer other than the specific layer, based on the channel bonding control information multiplexed on at least one of the data signals of the plurality of layers and the low-latency data signal, the control unit determines another physical channel that constitutes channel bonding transmission with the one physical channel, and causes a tuner other than the one tuner among the plurality of tuners to receive a signal transmitted on the determined physical channel. A receiving apparatus.

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