JP2024019827A - Transmission method and receiving device - Google Patents

Abstract

The present invention suppresses deterioration of reception performance in partial reception. [Solution] Physics of TDM (Time Division Multiplexing), which consists of an FSS (Frame Sync Symbol), P (Preamble) 1 symbol, P2 symbol, and one or more subframes arranged from the beginning in chronological order. An FDM TDM frame, which is a layer frame and is a physical layer frame in which at least subframes are FDM (Frequency Division Multiplexing), is generated. In the FDM TDM frame, for example, narrowband FSS and P1 symbols are arranged, in which the frequency bands of the FSS and P1 symbols are narrowed to a frequency band within a partial band that provides partial reception service. The present technology can be applied, for example, to a transmission system compatible with the broadcasting system of digital terrestrial television broadcasting. [Selection diagram] Figure 78

Description

The present technology relates to a transmitting method and a receiving device, and particularly relates to a transmitting method and a receiving device that can suppress deterioration of receiving performance in partial reception.

For example, in ISDB-T (Integrated Services Digital Broadcasting - Terrestrial), which is adopted by Japan and other countries as a broadcasting method for digital terrestrial television broadcasting, Frequency Division Multiplexing (FDM) is used as a method for multiplexing broadcast signals. ) has been adopted (for example, see Non-Patent Document 1).

In ISDB-T, broadcasting is mainly for fixed receivers, using 12 segments, and high-definition broadcasting, and broadcasting is mainly for mobile receivers, which is broadcasting for mobile phones and mobile terminals using 1 segment. ``One-segment partial reception service'' (One-Seg broadcasting) is stipulated.

Currently, advanced methods for the next generation of terrestrial digital television broadcasting are being considered. The advanced method also inherits ISDB-T's elemental technologies such as partial reception.

In addition to frequency division multiplexing (FDM), advanced methods include multiplexing methods such as time division multiplexing (TDM) and layered division multiplexing (LDM). The broadcasting system used is being studied.

ARIB STD-B31 2.2 version Radio Industries Association

In partial reception, data of a broadcasting service is transmitted (transmitted) only in a narrow band of a channel, and only (the signal of) the narrow band is received.

That is, in partial reception, only a narrow band of a part of the entire transmission band of a channel is received, and other frequency bands are not received.

Therefore, in partial reception, the reception performance may deteriorate more than in full-band reception in which (signals of) the entire transmission band of the channel are received.

The present technology has been developed in view of this situation, and is intended to suppress deterioration in reception performance during partial reception.

The first transmission method/device of the present technology is configured by arranging an FSS (Frame Sync Symbol), 1 P (Preamble) symbol, P2 symbol, and one or more subframes from the beginning in chronological order. a generation step/unit for generating an FDM TDM frame, which is a TDM (Time Division Multiplexing) physical layer frame, in which at least the subframe is an FDM (Frequency Division Multiplexing) physical layer frame; a transmission step/unit for transmitting a frame, the FDM-converted TDM frame is a narrow band in which the frequency band of the FSS and the P1 symbol is narrowed to a frequency band within a partial band that provides a partial reception service. This is a transmission method/apparatus that is an FDM TDM frame in which FSS and P1 symbols are arranged.

The first receiving device/method of the present technology is configured by arranging an FSS (Frame Sync Symbol), 1 P (Preamble) symbol, P2 symbol, and one or more subframes from the beginning in chronological order. a receiving unit/step for receiving an FDM TDM frame which is a physical layer frame of TDM (Time Division Multiplexing) and in which at least the subframes are FDM (Frequency Division Multiplexing); a processing unit/step for processing a frame, and the FDM-converted TDM frame is a narrow band in which the frequency band of the FSS and the P1 symbol is narrowed to a frequency band within a partial band that provides a partial reception service. This is a receiving apparatus/method for receiving an FDM TDM frame in which FSS and P1 symbols are arranged.

The second transmission method/device of the present technology is configured by arranging an FSS (Frame Sync Symbol), 1 P (Preamble) symbol, P2 symbol, and one or more subframes from the beginning in time order. a generation step/unit for generating an FDM TDM frame, which is a TDM (Time Division Multiplexing) physical layer frame, in which at least the subframe is an FDM (Frequency Division Multiplexing) physical layer frame; a transmitting step/unit for transmitting a frame, and the FDM-converted TDM frame is divided into a partial band in which the frequency band of the FSS and the P1 symbol provides a partial reception service and a frequency band other than the partial band. This is a transmission method/device that is an FDM TDM frame in which divided FSS and P1 symbols are arranged.

The second receiving device/method of the present technology is configured by arranging an FSS (Frame Sync Symbol), 1 P (Preamble) symbol, P2 symbol, and one or more subframes from the beginning in chronological order. a receiving unit/step for receiving an FDM TDM frame which is a physical layer frame of TDM (Time Division Multiplexing) and in which at least the subframes are FDM (Frequency Division Multiplexing); and a processing unit/step for processing a frame, wherein the FDM-converted TDM frame is divided into a partial band in which the frequency band of the FSS and the P1 symbol provides a partial reception service and a frequency band other than the partial band. This is a receiving apparatus/method for receiving an FDM TDM frame in which divided FSS and P1 symbols are arranged.

The third transmission method/device of the present technology is configured by arranging an FSS (Frame Sync Symbol), 1 P (Preamble) symbol, P2 symbol, and one or more subframes from the beginning in chronological order. a generation step/unit for generating an FDM TDM frame, which is a TDM (Time Division Multiplexing) physical layer frame, in which at least the subframe is an FDM (Frequency Division Multiplexing) physical layer frame; a transmission step/unit for transmitting a frame, the FDM-converted TDM frame is a narrow band in which the frequency band of the FSS and the P1 symbol is narrowed to a frequency band within a partial band that provides a partial reception service. This transmission method/apparatus is an FDM TDM frame in which a full-band FSS and a P1 symbol, which are the FSS before narrowband conversion and the P1 symbol, are arranged in the time direction.

The third receiving device/method of the present technology is configured by arranging an FSS (Frame Sync Symbol), 1 P (Preamble) symbol, P2 symbol, and one or more subframes from the beginning in time order. a receiving unit/step for receiving an FDM TDM frame which is a physical layer frame of TDM (Time Division Multiplexing) and in which at least the subframes are FDM (Frequency Division Multiplexing); a processing unit/step for processing a frame, and the FDM-converted TDM frame is a narrow band in which the frequency band of the FSS and the P1 symbol is narrowed to a frequency band within a partial band that provides a partial reception service. The receiving apparatus/method is a receiving device/method in which an FDM-modified TDM frame is arranged in the time direction, including a FSS and a P1 symbol, and a full-band FSS and a P1 symbol, which are the FSS before narrowband and the P1 symbol.

The fourth transmission method/device of the present technology is configured by arranging an FSS (Frame Sync Symbol), 1 P (Preamble) symbol, P2 symbol, and one or more subframes from the beginning in chronological order. a generation step/unit for generating an FDM TDM frame, which is a TDM (Time Division Multiplexing) physical layer frame, in which at least the subframe is an FDM (Frequency Division Multiplexing) physical layer frame; a transmitting step/unit for transmitting a frame, and the FDM-converted TDM frame includes a power of the FSS and the P1 symbol in a partial band that provides a partial reception service of the frequency band of the FSS and the P1 symbol. This is a transmission method/apparatus that is an FDM TDM frame that boosts the power of the frequency band and has higher power than other frequency bands.

The fourth receiving device/method of the present technology is configured by arranging an FSS (Frame Sync Symbol), 1 P (Preamble) symbol, P2 symbol, and one or more subframes from the beginning in time order. a receiving unit/step for receiving an FDM TDM frame which is a physical layer frame of TDM (Time Division Multiplexing) and in which at least the subframes are FDM (Frequency Division Multiplexing); The FDM-converted TDM frame includes a processing unit/step for processing a frame, and the FDM-converted TDM frame includes a power of the FSS and the P1 symbol in a partial band that provides a partial reception service among the frequency bands of the FSS and the P1 symbol. This is a receiving device/method for receiving an FDM TDM frame in which the power is boosted and the power is higher than that of other frequency bands.

The fifth transmission method/device of the present technology is configured by arranging an FSS (Frame Sync Symbol), 1 P (Preamble) symbol, P2 symbol, and one or more subframes from the beginning in time order. a generation step/unit for generating an FDM TDM frame, which is a TDM (Time Division Multiplexing) physical layer frame, in which at least the subframe is an FDM (Frequency Division Multiplexing) physical layer frame; the FDM-enabled TDM frame has more redundancy in the information bits of the FSS and the P1 symbol than in the case of a TDM physical layer frame in which subframes are not FDM-enabled. The transmission method/apparatus is an FDM-converted TDM frame in which the FSS and the P1 symbol are arranged so as to have the FSS and the P1 symbol.

The fifth receiving device/method of the present technology is configured by arranging an FSS (Frame Sync Symbol), 1 P (Preamble) symbol, P2 symbol, and one or more subframes from the beginning in chronological order. a receiving unit/step for receiving an FDM TDM frame which is a physical layer frame of TDM (Time Division Multiplexing) and in which at least the subframes are FDM (Frequency Division Multiplexing); the FDM-enabled TDM frame has more redundancy in the information bits of the FSS and the P1 symbol than in the case of a TDM physical layer frame in which subframes are not FDM-enabled. The receiving apparatus/method is an FDM-converted TDM frame in which the FSS and the P1 symbol are arranged so as to have the FSS and the P1 symbol.

In the first transmission method/device of the present technology, an FSS (Frame Sync Symbol), a P (Preamble) symbol, a P2 symbol, and one or more subframes are arranged from the beginning in time order. An FDM TDM frame, which is a TDM (Time Division Multiplexing) physical layer frame in which at least the subframes are FDM (Frequency Division Multiplexing) physical layer frames, is generated and transmitted. The FDM TDM frame is an FDM TDM frame in which the frequency band of the FSS and the P1 symbol is narrowed and the narrow band FSS and P1 symbol are arranged in a frequency band within a partial band that provides partial reception service. It has become.

In the first receiving device/method of the present technology, an FSS (Frame Sync Symbol), a P (Preamble) symbol, a P2 symbol, and one or more subframes are arranged from the beginning in chronological order. An FDM TDM frame, which is a TDM (Time Division Multiplexing) physical layer frame in which at least the subframe is FDM (Frequency Division Multiplexing) physical layer frame, is received and processed. The FDM TDM frame is an FDM TDM frame in which the frequency band of the FSS and the P1 symbol is narrowed and the narrow band FSS and P1 symbol are arranged in a frequency band within a partial band that provides partial reception service. It has become.

In the second transmission method/device of the present technology, an FSS (Frame Sync Symbol), a P (Preamble) symbol, a P2 symbol, and one or more subframes are arranged from the beginning in time order. An FDM TDM frame, which is a TDM (Time Division Multiplexing) physical layer frame in which at least the subframes are FDM (Frequency Division Multiplexing) physical layer frames, is generated and transmitted. The FDM TDM frame is an FDM TDM frame in which the frequency band of the FSS and P1 symbol is divided into a partial band providing partial reception service and a frequency band other than the partial band, and a divided FSS and P1 symbol are arranged. It is framed.

In the second receiving device/method of the present technology, an FSS (Frame Sync Symbol), a P (Preamble) symbol, a P2 symbol, and one or more subframes are arranged from the beginning in time order. An FDM TDM frame, which is a TDM (Time Division Multiplexing) physical layer frame in which at least the subframe is FDM (Frequency Division Multiplexing) physical layer frame, is received and processed. The FDM TDM frame is an FDM TDM frame in which the frequency band of the FSS and P1 symbol is divided into a partial band providing partial reception service and a frequency band other than the partial band, and a divided FSS and P1 symbol are arranged. It is framed.

In the third transmission method/device of the present technology, an FSS (Frame Sync Symbol), a P (Preamble) symbol, a P2 symbol, and one or more subframes are arranged from the beginning in time order. An FDM TDM frame, which is a TDM (Time Division Multiplexing) physical layer frame in which at least the subframes are FDM (Frequency Division Multiplexing) physical layer frames, is generated and transmitted. The FDM TDM frame includes narrowband FSS and P1 symbols in which the frequency bands of the FSS and P1 symbols are narrowed to a frequency band within a partial band that provides partial reception service, and narrowband FSS and P1 symbols that are It is an FDM TDM frame in which the full-band FSS and P1 symbol, which are the FSS and the P1 symbol, are arranged in the time direction.

In the third receiving device/method of the present technology, an FSS (Frame Sync Symbol), a P (Preamble) symbol, a P2 symbol, and one or more subframes are arranged from the beginning in time order. An FDM TDM frame, which is a TDM (Time Division Multiplexing) physical layer frame in which at least the subframe is FDM (Frequency Division Multiplexing) physical layer frame, is received and processed. The FDM TDM frame includes narrowband FSS and P1 symbols in which the frequency bands of the FSS and P1 symbols are narrowed to a frequency band within a partial band that provides partial reception service, and narrowband FSS and P1 symbols that are It is an FDM TDM frame in which the full-band FSS and P1 symbol, which are the FSS and the P1 symbol, are arranged in the time direction.

In the fourth transmission method/device of the present technology, an FSS (Frame Sync Symbol), a P (Preamble) symbol, a P2 symbol, and one or more subframes are arranged from the beginning in time order. An FDM TDM frame, which is a TDM (Time Division Multiplexing) physical layer frame in which at least the subframes are FDM (Frequency Division Multiplexing) physical layer frames, is generated and transmitted. The FDM-converted TDM frame boosts the power of the FSS and the P1 symbol in a partial band that provides partial reception service among the frequency bands of the FSS and the P1 symbol, and boosts the power of the FSS and the P1 symbol more than the power of other frequency bands. It is a larger FDM TDM frame.

In the fourth receiving device/method of the present technology, an FSS (Frame Sync Symbol), a P (Preamble) symbol, a P2 symbol, and one or more subframes are arranged from the beginning in time order. An FDM TDM frame, which is a TDM (Time Division Multiplexing) physical layer frame in which at least the subframe is FDM (Frequency Division Multiplexing) physical layer frame, is received and processed. The FDM-converted TDM frame boosts the power of the FSS and the P1 symbol in a partial band that provides partial reception service among the frequency bands of the FSS and the P1 symbol, and boosts the power of the FSS and the P1 symbol more than the power of other frequency bands. It is a larger FDM TDM frame.

In the fifth transmission method/device of the present technology, an FSS (Frame Sync Symbol), a P (Preamble) symbol, a P2 symbol, and one or more subframes are arranged from the beginning in time order. An FDM TDM frame, which is a TDM (Time Division Multiplexing) physical layer frame in which at least the subframes are FDM (Frequency Division Multiplexing) physical layer frames, is generated and transmitted. The FDM TDM frame includes the FSS and the P1 symbol configured to have more redundancy in the information bits of the FSS and the P1 symbol than in the case of a TDM physical layer frame in which subframes are not FDMized. It is an FDM TDM frame with .

In the fifth receiving device/method of the present technology, an FSS (Frame Sync Symbol), a P (Preamble) symbol, a P2 symbol, and one or more subframes are arranged from the beginning in time order. An FDM TDM frame, which is a TDM (Time Division Multiplexing) physical layer frame in which at least the subframe is FDM (Frequency Division Multiplexing) physical layer frame, is received and processed. The FDM TDM frame includes the FSS and the P1 symbol configured to have more redundancy in the information bits of the FSS and the P1 symbol than in the case of a TDM physical layer frame in which subframes are not FDMized. It is an FDM TDM frame with .

Each of the transmitting device and the receiving device may be an independent device, or may be an internal block constituting one device.

Further, the transmitting device and the receiving device can be realized by causing a computer to execute a program.

The program can be provided by being recorded on a recording medium or transmitted via a transmission medium.

FIG. 1 is a block diagram showing the configuration of an embodiment of a transmission system to which the present technology is applied. FIG. 2 is a block diagram showing a configuration example of a data processing device and a transmitting device in FIG. 1. FIG. FIG. 2 is a block diagram showing a configuration example of the receiving device in FIG. 1. FIG. FIG. 2 is a diagram illustrating the concept of the configuration of a physical layer frame to which the present technology is applied. FIG. 3 is a diagram showing a first configuration example of a physical layer frame in the case of time division multiplexing (TDM). FIG. 7 is a diagram showing a second configuration example of a physical layer frame in the case of time division multiplexing (TDM). FIG. 3 is a diagram showing an example of the structure of a physical layer frame in the case of frequency division multiplexing (FDM). FIG. 3 is a diagram showing details of a physical layer frame configuration in the case of frequency division multiplexing (FDM). FIG. 2 is a diagram showing an example of the configuration of a physical layer frame in the case of layer division multiplexing (LDM). FIG. 2 is a diagram showing the current configuration of a frame synchronization symbol (FSS) and a P1 symbol (P1). FIG. 2 is a diagram showing an overview of the configuration of a frame synchronization symbol (FSS) and a P1 symbol (P1) of the present technology. FIG. 2 is a diagram showing a comparison between the current configuration and the configuration of the present technology. FIG. 3 is a diagram showing the relationship between the value of g, FFT size, sample, maximum transmission rate, and robust transmission rate. FIG. 3 is a diagram showing the relationship between BLER and SNR when FFT = 512. FIG. 3 is a diagram showing the relationship between BLER and SNR when FFT=1024. FIG. 3 is a diagram showing the relationship between BLER and SNR when FFT = 2048. FIG. 3 is a diagram showing the relationship between BLER and SNR when FFT = 4096. FIG. 3 is a diagram showing the relationship between BLER and SNR when FFT = 8192. FIG. 2 is a diagram illustrating a layer configuration when partial bands are received using frequency division multiplexing (FDM). FIG. 3 is a diagram showing the relationship between BLER and SNR when FFT=1024 when partial band reception is performed using frequency division multiplexing (FDM). FIG. 2 is a diagram showing the configuration of a frame synchronization symbol (FSS) and a P1 symbol (P1) of the present technology. FIG. 3 is a diagram showing the relationship among FFT size, samples per symbol, maximum transmission rate, robust transmission rate, number of symbols, maximum number of bits, and total samples. FIG. 3 is a diagram showing an example of the configuration of a P2 symbol in the case of time division multiplexing (TDM). FIG. 3 is a diagram showing a first configuration example of a P2 symbol in the case of frequency division multiplexing (FDM). FIG. 7 is a diagram showing a second configuration example of a P2 symbol in the case of frequency division multiplexing (FDM). FIG. 3 is a diagram showing a first configuration example of a P2 symbol in the case of layer division multiplexing (LDM). FIG. 7 is a diagram showing a second configuration example of a P2 symbol in the case of layer division multiplexing (LDM). FIG. 2 is a diagram illustrating an example of a frame synchronization symbol (FSS) synchronization pattern. FIG. 3 is a diagram showing an example of the syntax of P1 signaling in the case of time division multiplexing (TDM). 30 is a diagram showing an example of P1_P2_waveform_structure in FIG. 29. FIG. FIG. 3 is a diagram showing an example of syntax of P1 signaling in the case of frequency division multiplexing (FDM). 32 is a diagram showing an example of P1_P2_waveform_structure in FIG. 31. FIG. FIG. 3 is a diagram illustrating an example of syntax of P1 signaling in the case of layer division multiplexing (LDM). 34 is a diagram showing an example of P1_P2_waveform_structure in FIG. 33. FIG. FIG. 3 is a diagram showing an example of a combination of FFT size and GI. FIG. 3 is a diagram showing an example of a combination of FFT size, GI, and pilot pattern. FIG. 3 is a diagram showing an example of the syntax of P1 signaling in the case of time division multiplexing (TDM). 38 is a diagram showing an example of P1_Frame_Multiplexing in FIG. 37. FIG. FIG. 3 is a diagram showing an example of syntax of P1 signaling in the case of frequency division multiplexing (FDM). 40 is a diagram showing an example of P1_Frame_Multiplexing in FIG. 39. FIG. FIG. 3 is a diagram illustrating an example of syntax of P1 signaling in the case of layer division multiplexing (LDM). 42 is a diagram showing an example of P1_Frame_Multiplexing in FIG. 41. FIG. FIG. 3 is a diagram illustrating an example of syntax of L1B signaling in the case of time division multiplexing (TDM). FIG. 3 is a diagram illustrating an example of syntax of L1B signaling in the case of frequency division multiplexing (FDM). FIG. 3 is a diagram illustrating an example of syntax of L1B signaling in the case of layer division multiplexing (LDM). FIG. 3 is a diagram showing an example of the syntax of P1 signaling when it is shared. FIG. 7 is a diagram showing an example of the syntax of L1B signaling when it is shared. FIG. 3 is a diagram illustrating a first example of syntax of L1D signaling in the case of time division multiplexing (TDM). FIG. 6 is a diagram illustrating a second example of L1D signaling syntax in the case of time division multiplexing (TDM). FIG. 2 is a diagram illustrating a first example of syntax of L1D signaling in the case of frequency division multiplexing (FDM). FIG. 7 is a diagram illustrating a second example (layer A) of L1D signaling syntax in the case of frequency division multiplexing (FDM). FIG. 7 is a diagram illustrating a second example (layer B) of the syntax of L1D signaling in the case of frequency division multiplexing (FDM). FIG. 7 is a diagram showing a third example (layer A) of the syntax of L1D signaling in the case of frequency division multiplexing (FDM). FIG. 7 is a diagram showing a third example (layer B) of the syntax of L1D signaling in the case of frequency division multiplexing (FDM). FIG. 2 is a diagram illustrating a first example of L1D signaling syntax in the case of layer division multiplexing (LDM). FIG. 7 is a diagram illustrating a second example (layer k) of the syntax of L1D signaling in the case of layer division multiplexing (LDM). FIG. 7 is a diagram showing a second example (layer k+1) of the syntax of L1D signaling in the case of layer division multiplexing (LDM). FIG. 7 is a diagram illustrating a third example (layer k) of the syntax of L1D signaling in the case of layer division multiplexing (LDM). FIG. 7 is a diagram showing a third example (layer k+1) of the syntax of L1D signaling in the case of layer division multiplexing (LDM). FIG. 3 is a diagram illustrating an example of centralized arrangement of L1 signaling in a physical layer frame to which the present technology is applied. FIG. 2 is a diagram showing an example of arrangement of frame synchronization symbols (FSS), P1 symbols (P1), and P2 symbols (P2) in the case of frequency division multiplexing (FDM) and layer division multiplexing (LDM). FIG. 3 is a diagram illustrating processing on the receiving side for physical layer frames in the case of time division multiplexing (TDM). FIG. 2 is a diagram illustrating processing on the receiving side for a physical layer frame in the case of frequency division multiplexing (FDM). FIG. 2 is a diagram illustrating processing on the receiving side for a physical layer frame in the case of frequency division multiplexing (FDM). FIG. 2 is a diagram illustrating processing on the receiving side for a physical layer frame in the case of frequency division multiplexing (FDM). FIG. 3 is a diagram illustrating processing on the receiving side for physical layer frames in the case of layer division multiplexing (LDM). 12 is a flowchart illustrating the flow of processing on the transmitting side and the receiving side corresponding to the first solution method (synchronization pattern solution method). 12 is a flowchart illustrating the flow of processing on the transmitting side and the receiving side corresponding to the first solution method (P1 signaling solution method). 12 is a flowchart illustrating the flow of processing on the transmitting side and the receiving side corresponding to the second solution method. 12 is a flowchart illustrating the flow of processing on the transmitting side and the receiving side corresponding to the third solution method (compatible with FDM). 12 is a flowchart illustrating the flow of processing on the transmitting side and the receiving side corresponding to the third solution method (LDM compatible). FIG. 2 is a diagram showing an overview of a configuration example of a physical layer frame of time division multiplexing (TDM). FIG. 2 is a diagram illustrating an overview of a configuration example of a TDM frame in which subframes are converted into FDM. FIG. 7 is a diagram illustrating an outline of another configuration example of an FDM-converted TDM frame. FIG. 7 is a diagram showing details of another example configuration of an FDM-converted TDM frame. FIG. 2 is a block diagram showing a configuration example of a transmitting device 20 and a receiving device 30 when handling TDM frames (including FDM-converted TDM frames). 3 is a diagram illustrating processing of an FDM-converted TDM frame by the receiving device 30. FIG. It is a figure explaining the 1st suppression method. It is a figure explaining the 2nd suppression method. It is a figure explaining the 3rd suppression method. It is a figure explaining the 4th suppression method. It is a figure explaining the 5th suppression method. 12 is a flowchart illustrating an example of processing of the transmitting device 20 when a partial reception service is provided using the first to fifth FDM-converted TDM frames. 12 is a flowchart illustrating an example of processing of the receiving device 30 when a partial reception service is provided using the first to fifth FDM-converted TDM frames. FIG. 3 is a diagram illustrating a configuration example of an FDM-converted P2 symbol arranged in an FDM-converted TDM frame. FIG. 3 is a diagram showing an example of the syntax of P1-1 signaling. FIG. 6 is a diagram illustrating an example of the semantics of emergency_warning. FIG. 3 is a diagram illustrating an example of the semantics of band_width. FIG. 6 is a diagram illustrating an example of the semantics of partial_reception_flag. FIG. 6 is a diagram illustrating an example of the semantics of next_frame. FIG. 2 is a diagram showing an example of syntax of P1-2 signaling. It is a figure which shows the example of the semantics of P2_Basic_fec_type. FIG. 6 is a diagram illustrating an example of the semantics of P2_Basic_fft_size. FIG. 7 is a diagram illustrating an example of the semantics of P2_Basic_cp_pattern. FIG. 7 is a diagram illustrating an example of the semantics of P2_Basic_guard_interval. FIG. 3 is a diagram showing an example of the syntax of L1B signaling (P2 basic information). It is a diagram showing an example of the semantics of P2B_Detail_fec_type. FIG. 3 is a diagram illustrating an example of syntax of L1D signaling (P2 detailed information). FIG. 3 is a diagram illustrating an example of semantics of P2D_ntp_leap_indicator. It is a figure which shows the example of the semantics of P2D_subframe_fft_size. It is a figure which shows the example of the semantics of P2D_subframe_guard_interval. It is a figure which shows the example of the semantics of P2D_subframe_scattered_pilot_pattern. FIG. 6 is a diagram illustrating an example of the semantics of P2D_layer_num_subsegments. FIG. 3 is a diagram illustrating an example of semantics of P2D_layer_carrier_modulation. FIG. 3 is a diagram illustrating an example of semantics of P2D_layer_constellation_type. It is a figure which shows the example of the semantics of P2D_layer_code_length. FIG. 3 is a diagram illustrating an example of semantics of P2D_layer_code_rate. FIG. 6 is a diagram illustrating an example of the semantics of P2D_layer_time_interleaving_length. FIG. 3 is a diagram illustrating an example of the semantics of P2D_layer_data_boost. FIG. 7 is a diagram illustrating an example of the syntax of Auxiliary_data (). FIG. 3 is a diagram showing an example of the syntax of P2 signaling (P2 information) that combines L1B signaling (P2 basic information) and L1D signaling (P2 detailed information). FIG. 3 is a diagram illustrating a specific example of an FEC type. 1 is a block diagram showing an example of the configuration of a computer. FIG.

<System configuration>

(Example of transmission system configuration)
FIG. 1 is a block diagram showing the configuration of an embodiment of a transmission system to which the present technology is applied. Note that a system refers to a logical collection of multiple devices.

In FIG. 1, a transmission system 1 includes data processing devices 10-1 to 10-N (N is an integer of 1 or more) installed in facilities related to each broadcasting station, and a transmitting device 20 installed at a transmitting station. , receiving devices 30-1 to 30-M (M is an integer of 1 or more) owned by end users.

Furthermore, in this transmission system 1, the data processing devices 10-1 to 10-N and the transmitting device 20 are connected via communication lines 40-1 to 40-N. Note that the communication lines 40-1 to 40-N can be dedicated lines, for example.

The data processing device 10-1 processes content such as broadcast programs produced by the broadcast station A, and transmits the resulting transmission data to the transmitting device 20 via the communication line 40-1.

In the data processing devices 10-2 to 10-N, similar to the data processing device 10-1, contents such as broadcast programs produced by broadcast stations such as broadcast station B and broadcast station Z are processed, and the results are The obtained transmission data is transmitted to the transmitting device 20 via the communication lines 40-2 to 40-N.

The transmitting device 20 receives transmission data transmitted from the data processing devices 10-1 to 10-N on the broadcasting station side via the communication lines 40-1 to 40-N. The transmitting device 20 processes the transmission data from the data processing devices 10-1 to 10-N, and transmits the resulting broadcast signal from a transmitting antenna installed at a transmitting station.

As a result, the broadcast signal from the transmitting device 20 on the transmitting station side is transmitted to the receiving devices 30-1 to 30-M via the broadcasting transmission path 50.

The receiving devices 30-1 to 30-M are fixed receivers such as television receivers, set-top boxes (STBs), video recorders, game consoles, network storage, or smartphones, mobile phones, tablet computers, etc. is a mobile receiver. Furthermore, the receiving devices 30-1 to 30-M may be, for example, in-vehicle equipment mounted on a vehicle such as an in-vehicle television, or wearable computers such as a head mounted display (HMD).

The receiving device 30-1 receives and processes the broadcast signal transmitted from the transmitting device 20 via the broadcast transmission path 50, thereby playing back content such as a broadcast program according to the channel selection operation by the end user. do.

In the receiving devices 30-2 to 30-M, similarly to the receiving device 30-1, the broadcast signal from the transmitting device 20 is processed, and content is reproduced according to the channel selection operation by the end user.

In addition, in the transmission system 1, the broadcast transmission path 50 includes not only terrestrial broadcasting (terrestrial broadcasting), but also satellite broadcasting using a broadcasting satellite (BS) or a communications satellite (CS), or, for example, It may also be a wired broadcast using a cable (CATV: Common Antenna TeleVision).

Furthermore, in the following description, the data processing devices 10-1 to 10-N on the broadcasting station side will be referred to as data processing devices 10 unless there is a particular need to distinguish them. Further, the receiving devices 30-1 to 30-M are referred to as receiving devices 30 unless there is a particular need to distinguish them.

FIG. 2 is a block diagram showing a configuration example of the data processing device 10 and the transmitting device 20 in FIG. 1. As shown in FIG.

In FIG. 2, the data processing device 10 includes a component processing section 111, a signaling generation section 112, a multiplexer 113, and a data processing section 114.

The component processing unit 111 processes component data constituting content such as a broadcast program, and supplies the resulting component stream to the multiplexer 113. Here, the component data is, for example, data such as video, audio, subtitles, etc., and processing such as encoding processing based on a predetermined encoding method is performed on these data, for example.

The signaling generation unit 112 generates signaling used in upper layer processing such as tuning and reproduction of content, and supplies it to the multiplexer 113. Further, the signaling generation unit 112 generates signaling used in physical layer processing and supplies it to the data processing unit 114.

Note that signaling is also referred to as control information. In addition, in the following explanation, among the signaling, the signaling used in physical layer processing is referred to as physical layer signaling (L1 signaling), while the signaling used in the processing of the physical layer is referred to as the The signaling used in processing is referred to as upper layer signaling.

The multiplexer 113 multiplexes the component stream supplied from the component processing unit 111 and the upper layer signaling stream supplied from the signaling generation unit 112, and supplies the resulting stream to the data processing unit 114. . Note that other streams such as applications and time information may be multiplexed here.

The data processing unit 114 processes the stream supplied from the multiplexer 113 to generate packets (frames) in a predetermined format. Further, the data processing unit 114 processes packets in a predetermined format and physical layer signaling from the signaling generation unit 112 to generate transmission data, and transmits the data to the transmission device 20 via the communication line 40.

In FIG. 2, transmitting device 20 includes a data processing section 211 and a modulation section 212.

The data processing unit 211 receives and processes transmission data transmitted from the data processing device 10 via the communication line 40, and generates packets (frames) in a predetermined format and physical layer signaling. Extract information.

The data processing unit 211 processes packets (frames) in a predetermined format and physical layer signaling information to generate a physical layer frame (physical layer frame) compliant with a predetermined broadcasting method, and the modulation unit 212.

The modulation unit 212 performs necessary processing (modulation processing) on the physical layer frame supplied from the data processing unit 211, and transmits the resulting broadcast signal from a transmission antenna installed at a transmitting station. .

The data processing device 10 and the transmitting device 20 are configured as described above.

(Configuration of receiving side device)
FIG. 3 is a block diagram showing a configuration example of the receiving device 30 of FIG. 1. As shown in FIG.

In FIG. 3, the receiving device 30 includes an RF section 311, a demodulating section 312, and a data processing section 313.

The RF section 311 includes, for example, a tuner. The RF section 311 performs necessary processing on the broadcast signal received via the antenna 321, and supplies the resulting signal to the demodulation section 312.

The demodulation unit 312 is composed of, for example, a demodulation LSI (Large Scale Integration). The demodulation section 312 performs demodulation processing on the signal supplied from the RF section 311. In this demodulation process, for example, a physical layer frame is processed in accordance with physical layer signaling to obtain a packet in a predetermined format. The packet obtained by the demodulation process is supplied to the data processing section 313.

The data processing unit 313 includes, for example, a main SoC (System On Chip). The data processing unit 313 performs predetermined processing on the packets supplied from the demodulation unit 312. Here, for example, stream decoding processing, playback processing, etc. are performed based on upper layer signaling included in the packet.

Data such as video, audio, and subtitles obtained through processing by the data processing unit 313 is output to a subsequent circuit. As a result, the receiving device 30 reproduces content such as a broadcast program and outputs its video and audio.

The receiving device 30 is configured as described above.

<Overview of technology for realizing multiple multiplexing methods using the same broadcasting system>

As mentioned above, in Japan, ISDB-T is adopted as a broadcasting system for terrestrial digital television broadcasting (see, for example, Non-Patent Document 1 mentioned above).

In ISDB-T, broadcasting is mainly for fixed receivers, using 12 segments, and high-definition broadcasting, and broadcasting is mainly for mobile receivers, which is broadcasting for mobile phones and mobile terminals using 1 segment. ``One-segment partial reception service'' (One-Seg broadcasting) is stipulated.

On the other hand, in Japan, studies have begun to advance the next generation of terrestrial digital television broadcasting. The current ISDB-T uses frequency division multiplexing (FDM) as a method for multiplexing broadcast signals.

In next-generation terrestrial digital television broadcasting, in addition to frequency division multiplexing (FDM), multiplexing methods such as time division multiplexing (TDM) and layered division multiplexing (LDM) will be used. Several broadcasting systems using this method are being considered.

However, at present, no technical method has been established for implementing multiple multiplexing methods using the same broadcasting system, and when implementing multiple multiplexing methods using the same broadcasting system, Proposals for flexible operation were requested.

In order to meet such demands, the present technology proposes the following three solution methods.

First, when implementing multiple multiplexing methods (FDM, TDM, LDM) in the same broadcasting system, there was a problem in that it was not possible to determine the multiplexing method. The problem will be solved using the first solution method.

That is, in the first solution, in the physical layer frame, different synchronization patterns are used with a common Frame Sync Symbol (FSS), or the same synchronization pattern is used with a common Frame Sync Symbol (FSS). Although it is a pattern, the multiplexing method can be determined by using P1 signaling information of the P1 symbol (Preamble 1 Symbol).

In the following description, among the first solution methods, the former will be referred to as a synchronization pattern solution method, and the latter will be referred to as a P1 signaling solution method.

Second, when frequency division multiplexing (FDM) is adopted, such as the current ISDB-T, L1 signaling such as TMCC (Transmission Multiplexing Configuration Control) information is distributed and arranged in the physical layer frame. , the receiving device 30 had a problem in that it always required one frame to achieve synchronization, but this problem will be solved by the second solution method.

In other words, in the second solution method, by concentrating L1 signaling at the beginning of the physical layer frame, the receiving device 30 can quickly acquire the L1 signaling and achieve synchronization. Allow time to be shortened.

Third, with the current technology, it is possible to convert the payload of the physical layer frame into FDM or LDM by applying frequency division multiplexing (FDM) or layer division multiplexing (LDM). However, there was a problem that the frame synchronization symbol (FSS) and preamble (Preamble) could not be converted into FDM or LDM, but this problem will be solved by the third solution method.

That is, in the third solution method, in the case of frequency division multiplexing (FDM) or layer division multiplexing (LDM), by arranging a P2 symbol (Preamble 2 Symbol) for each layer, the preamble is Make it possible to convert to FDM or LDM.

Note that, for example, in ATSC (Advanced Television Systems Committee) 3.0, which is one of the broadcasting systems for next-generation terrestrial digital television broadcasting, the payload of a physical layer frame can be converted into FDM or LDM.

In this way, this technology uses the above three solution methods (technical features) to enable more flexible operation when multiple multiplexing methods (FDM, TDM, LDM) are implemented in the same broadcasting system. be able to do so.

Hereinafter, such a solution method (technical feature) of the present technology will be described with reference to specific embodiments. However, in the following explanation, the structure of the physical layer frame will be explained first, and then three solution techniques will be explained.

<Frame configuration>

(Frame composition concept)
FIG. 4 is a diagram illustrating the concept of the configuration of a physical layer frame to which the present technology is applied.

A physical layer frame to which this technology is applied consists of one (1 (OFDM) symbol) frame sync symbol (FSS), one or more P1 symbols (P1: Preamble 1 Symbol(s)), and one It consists of the above P2 symbols (P2: Preamble 2 Symbol(s)) and one or more data (Data).

A frame synchronization symbol (FSS) is inserted at the beginning of a physical layer frame. Note that the frame synchronization symbol (FSS) can be configured to be robust.

The P1 symbol (P1) is the first preamble (Preamble 1). Further, the P2 symbol (P2) is a second preamble (Preamble 2).

Here, for example, the frame synchronization symbol (FSS) and the P1 symbol (P1) correspond to the bootstrap that constitutes the physical layer frame specified by ATSC3.0, and the P2 symbol (P2) corresponds to the preamble ( Preamble) (for example, see Non-Patent Document 2 below).

Non-patent document 2: ATSC Standard: A/321, System Discovery and Signaling

The P1 symbol (P1) and the P2 symbol (P2) include physical layer signaling (L1 signaling). Here, the signaling of the P1 symbol (P1) is referred to as P1 signaling. Furthermore, the signaling of the P2 symbol (P2) is referred to as P2 signaling.

Furthermore, P2 signaling can be divided into a fixed length portion L1-Basic (hereinafter also referred to as L1B signaling) and a variable length portion L1-Detail (hereinafter also referred to as L1D signaling). Note that details of P1 signaling and P2 signaling will be described later.

Data is composed of a plurality of data symbols. Note that a boundary symbol (BS) indicating a frame boundary is arranged in the data (Data) as necessary.

A physical layer frame to which the present technology is applied can be configured as described above.

In addition, in the physical layer frame shown in FIG. 4, for example, the frame synchronization symbol (FSS) and the P1 symbol (P1) are (symbols similar to) the (OFDM) symbol disclosed in the above-mentioned Non-Patent Document 2. The P2 symbol (P2) and data (data symbol) can be OFDM symbols. Here, in OFDM (Orthogonal Frequency Division Multiplexing), a large number of orthogonal subcarriers (subcarriers) are provided within a transmission band, and digital modulation is performed.

Furthermore, the concept of the structure of the physical layer frame shown in FIG. The same applies if . The details of the structure of the physical layer frame will be described below for each of these multiplexing methods.

(1) Structure of physical layer frame of time division multiplexing (TDM)

(First configuration example)
FIG. 5 is a diagram showing a first configuration example of a physical layer frame in the case of time division multiplexing (TDM).

Time division multiplexing (TDM) is a multiplexing method that allows multiple broadcast signals to be temporally arranged and transmitted over one transmission path.

In FIG. 5, the direction from the left side to the right side in the figure is the direction of frequency (Freq), and the direction from the top side to the bottom side of the figure is the direction of time (Time). This shows the structure of a physical layer frame when (TDM) is used.

In FIG. 5, physical layer frames are transmitted in time series, and a frame synchronization symbol (FSS) is inserted at the beginning of each physical layer frame. Here, the configuration of physical layer frame n (Frame n) will be described as a representative among a plurality of physical layer frames transmitted in time series.

The physical layer frame n in FIG. 5 is composed of a frame synchronization symbol (FSS), a P1 symbol (P1), a P2 symbol (P2), a frame, and a boundary symbol (BS). In physical layer frame n, after acquiring (the L1 signaling of) the P1 symbol and the P2 symbol, it is possible to acquire the subsequent frame.

Further, in the physical layer frame n in FIG. 5, a frame as a data symbol and a boundary symbol (BS) correspond to data. Here, the boundary symbol represents a symbol inserted at the end of a frame.

In addition, in FIG. 5, the structure of physical layer frame n is explained as a representative among the plurality of physical layer frames, but other physical layer frames such as physical layer frame n+1 are similarly structured and are arranged in chronological order. It will be transmitted.

(Second configuration example)
FIG. 6 is a diagram showing a second configuration example of a physical layer frame in the case of time division multiplexing (TDM).

In FIG. 6, physical layer frame n differs from physical layer frame n in FIG. 5 in that one or more subframes (SubFrame) are arranged instead of one frame (Frame). In the physical layer frame n in FIG. 6, two subframes, subframe n and subframe n+1, are arranged.

In the physical layer frame n of FIG. 6, after acquiring the P1 symbol and the P2 symbol (the L1 signaling thereof), it is possible to acquire the subsequent subframe n and subframe n+1.

Here, when two or more subframes are arranged in physical layer frame n in FIG. 6, it is possible to change modulation parameters such as FFT size, guard interval length, and pilot pattern for each subframe. can.

Further, a subframe boundary symbol representing a symbol inserted at the start and end of the subframe is inserted into each subframe. In the physical layer frame n, a subframe as a data symbol and a subframe boundary symbol correspond to data.

A physical layer frame using time division multiplexing (TDM) can be configured as described above.

(2) Structure of the physical layer frame of frequency division multiplexing (FDM)

(Frame configuration example)
FIG. 7 is a diagram showing an example of the structure of a physical layer frame in the case of frequency division multiplexing (FDM).

Frequency division multiplexing (FDM) is a multiplexing method that divides a frequency band for transmitting a plurality of broadcast signals so that they can be transmitted over one transmission path.

In FIG. 7, the frequency division multiplexing method is shown in which the direction from the left side of the figure to the right side is the direction of frequency (Freq), and the direction from the top to the bottom of the figure is the direction of time (Time). This shows the structure of a physical layer frame when (FDM) is used.

In FIG. 7, physical layer frames are transmitted in chronological order, and a frame synchronization symbol (FSS) is inserted at the beginning of each physical layer frame, followed by a P1 symbol (P1). .

Furthermore, when frequency division multiplexing (FDM) is used, a predetermined frequency band (for example, 6 MHz) is frequency-divided into a plurality of segments. A hierarchy is constructed by grouping one or more segments. For example, in FIG. 7, the frequency is divided into 35 segments, and the center 9 segments in the figure constitute Layer A, and the remaining segments on the left and right constitute Layer B. Ru.

In the physical layer frame n in FIG. 7, a P2 symbol (P2), a frame as a data symbol, and a boundary symbol (BS) are arranged for each layer of layer A and layer B.

Here, FIG. 8 shows details of the configuration of the physical layer frame of FIG. 7. In FIG. 8, the P2 symbol, data symbol, and boundary symbol for each layer of layer A and layer B are shown in segment units represented by squares in the figure.

That is, in FIG. 8, when the frequency is divided into, for example, 35 segments by using frequency division multiplexing (FDM), the middle layer A is composed of 9 segments, and the left and right layers B are It consists of the remaining 26 segments. Note that each segment represented by a square in the figure is composed of the same number of subcarriers.

A physical layer frame when frequency division multiplexing (FDM) is used can be configured as described above.

(3) Structure of physical layer frame of layered division multiplexing (LDM)

(Frame configuration example)
FIG. 9 is a diagram showing an example of the structure of a physical layer frame in the case of layer division multiplexing (LDM).

Layer division multiplexing (LDM) is a multiplexing method that divides a plurality of broadcast signals into different hierarchical powers so that they can be transmitted over one transmission path.

In FIG. 9, the three dimensions of xyz represent the configuration of a physical layer frame when layer division multiplexing (LDM) is used. However, in Figure 9, the x direction in the diagram is the direction of power (Power), the y direction in the diagram is the direction of frequency (Freq), and the z direction in the diagram is the direction of time (Time). There is.

In FIG. 9, physical layer frames are transmitted in chronological order, and a frame synchronization symbol (FSS) is inserted at the beginning of each physical layer frame, followed by a P1 symbol (P1). .

Furthermore, when layer division multiplexing (LDM) is used, a P2 symbol (P2), a frame as a data symbol, and a boundary symbol (BS) are arranged for each layer with different transmission power. . For example, in physical layer frame n in FIG. 9, P2 symbols, data symbols, and boundary symbols are arranged for each of the two layers, layer k and layer k+1. ing.

A physical layer frame when layer division multiplexing (LDM) is used can be configured as described above.

In addition, in the explanation of this specification, the same term "layer" is used in frequency division multiplexing (FDM) and layer division multiplexing (LDM), but these "layers" have different meanings technically. Here, in the description of this specification, when it is clear which type of hierarchy is used, the term "hierarchy" is used without making any particular distinction. On the other hand, especially when it is necessary to distinguish the term "layer", the frequency division multiplexing (FDM) layer is written as the "FDM layer", and the layer division multiplexing (LDM) layer is referred to as the "FDM layer". shall be described as the "LDM layer".

(4) Structure of frame synchronization symbol (FSS) and P1 symbol (P1)

Next, the configuration of the frame synchronization symbol (FSS) and P1 symbol (P1) in the physical layer frame will be described with reference to FIGS. 10 to 22.

(Current FSS and P1 configuration)
FIG. 10 is a diagram showing the current structure of the frame synchronization symbol (FSS) and P1 symbol (P1).

The CAB structure and BCA structure shown in FIG. 10 correspond to the bootstrap configuration defined in ATSC3.0 (for example, see the above-mentioned Non-Patent Document 2). Here, the frame synchronization symbol (FSS) consists of a CAB structure, while the P1 symbol (P1) consists of a BCA structure. That is, ATSC3.0 specifies that one physical layer frame includes one frame synchronization symbol (FSS) and three P1 symbols (P1).

However, in the CAB structure of the frame synchronization symbol (FSS) in FIG. 10, the samples in the C part are 520, the samples in the A part are 2048, and the samples in the B part are 504. be done. Similarly, in the BCA structure of the P1 symbol (P1) in FIG. 10, the samples in the B part are 504, the samples in the C part are 520, and the samples in the A part are 2048.

(Configuration of FSS and P1 of this technology)
FIG. 11 is a diagram showing an overview of the structure of the frame synchronization symbol (FSS) and P1 symbol (P1) of the present technology.

In FIG. 11, in the CAB structure of the frame synchronization symbol (FSS), when the samples of parts C, A, and B are respectively 520g, 2048g, and 504g, in the configuration of this technology, mainly g = 0.5 and I will make it happen. On the other hand, in the BCA structure of the P1 symbol (P1), when the samples of the B, C, and A portions are respectively 504g, 520g, and 2048g, in the configuration of this technology, g = 0.5. do it like this.

That is, by setting g = 0.5, the symbol lengths of the frame synchronization symbol (FSS) and the P1 symbol (P1) can be halved, so high efficiency can be achieved in the physical layer frame.

Specifically, in the CAB structure of the frame synchronization symbol (FSS), the number of samples in the C part can be 260, the samples in the A part can be 1024, and the samples in the B part can be 252. Similarly, in the BCA structure of the P1 symbol (P1), the samples in the B part can be 252, the samples in the C part can be 260, and the samples in the A part can be 1024. Note that portions B and C are each constructed by copying or frequency shifting the last part and another part of portion A.

In addition, in the configuration of this technology, by reducing the number of P1 symbols from three to two compared to the ATSC3.0 configuration, one frame synchronization symbol (FSS) in one physical layer frame. Include two P1 symbols (P1). In other words, the configuration of this technology reduces the efficiency to 3/4 compared to the ATSC3.0 configuration.

In FIG. 12, the structure of ATSC3.0 is shown in the upper row as the structure of the frame synchronization symbol (FSS) and the P1 symbol (P1), while the structure of the present technology is shown in the lower row.

In Figure 12, in the configuration of this technology in the lower row, compared to the ATSC3.0 configuration in the upper row, the symbol length of the frame synchronization symbol (FSS) and P1 symbol (P1) is halved, and the number of P1 symbols is has been reduced from three to two. Therefore, the configuration of the present technology in the lower row can reduce the transmission time to 3/8 (1/2 × 3/4) compared to the ATSC3.0 configuration in the upper row.

Here, FIG. 13 shows the relationship between the value of g, FFT size, samples (Samples), maximum transmission rate (Max bps), and robust transmission rate (Robust bps).

In FIG. 13, the values of FFT size, sample, maximum transmission rate, and robust transmission rate increase or decrease depending on the value of g. As mentioned above, in the configuration of this technology, the configuration of ATSC3.0 (g = 1.0), the efficiency can be improved. Here, 1024 samples, 252 samples, and 260 samples out of 1536 samples are parts A, B, and C, respectively. Parts B and C are copies or frequency shifts of the last part of A, so the only part subject to IFFT is the part A of 1024 samples, and IFFT is performed with FTT size = 1024. be able to.

Although a maximum of 10 bps is theoretically possible for robust transmission speed, in reality, back-off (back-off) -off) to operate at 3bps or 4bps. Note that in the ATSC3.0 configuration, the theoretical maximum speed is 11bps, but in reality, it will operate at 8bps. On the other hand, with the configuration of this technology, it is possible to operate at, for example, 6 bps, although the theoretical maximum is 10 bps.

Furthermore, in order to prove that g = 0.5 is suitable as the value of g, the inventor of this technology conducted a simulation to obtain the SNR (Symbol to Noise Ratio) for each FFT size shown in Fig. 13. I did it. The simulation results are shown in FIGS. 14 to 18.

Note that this simulation assumes that the receiving device 30 receives the entire frequency band (for example, 6 MHz) assigned to the channel. In addition, in FIGS. 14 to 18, the horizontal axis represents SNR (Symbol to Noise Ratio), and the vertical axis represents BLER (Block Error Rate).

In addition, in FIGS. 14 to 18, a in [a, b, c] expressed by different line types as simulation results represents the number of bits of the frame synchronization symbol (FSS) of the 1st (OFDM) symbol, and a Other characters such as b and c represent the number of bits of the P1 symbol (P1) after the second (OFDM) symbol. Frame synchronization symbols (FSS) have no information, so they are all 0 bits. Furthermore, the number of bits of the P1 symbol (P1) is set to 2 to 12 bits, etc.

FIG. 14 shows simulation results when FFT size=512. In the simulation results of FIG. 14, when BLER = 1.0×10 ^-3 (1.0E-03), SNR = -6 dB.

FIG. 15 shows simulation results when FFT size=1024. In the simulation results of FIG. 15, when BLER = 1.0×10 ^-3 (1.0E-03), SNR = -7.6 dB.

FIG. 16 shows simulation results when FFT size = 2048. In the simulation results of FIG. 16, when BLER = 1.0×10 ^-3 (1.0E-03), SNR = -9.6 dB.

FIG. 17 shows simulation results when FFT size = 4096. In the simulation results of FIG. 17, when BLER = 1.0×10 ^-3 (1.0E-03), SNR = -10.8 dB.

FIG. 18 shows simulation results when FFT size = 8192. In the simulation results of FIG. 18, when BLER = 1.0×10 ^-3 (1.0E-03), SNR = -12.5 dB.

Here, the configuration of ATSC3.0 corresponds to the simulation result (FIG. 16) when g = 1.0, that is, FFT size = 2048, so SNR = -9.6 dB. On the other hand, the configuration of the present technology corresponds to the simulation result (FIG. 15) when g = 0.5, that is, FFT size = 1024, so SNR = -7.6 dB.

As for the SNR, a value of about -7.6 dB is usually sufficient, and a value up to -9.6 dB is not necessary. In other words, g = 1.0, which is used in the ATSC3.0 configuration, is overspec, and g = 0.5 provides sufficient performance. Therefore, in the configuration of the present technology, g = 0.5 is preferred.

However, although we have explained here that g = 0.5 is preferable from the perspective of reducing transmission time, in the physical layer frame configuration of this technology, values of g such as g = 0.25, 1.00, 2.00, 4.00, etc. As such, a value other than 0.5 may be used.

Further, when frequency division multiplexing (FDM) is used as the multiplexing method, the receiving device 30 receives the frame synchronization symbol (FSS) and the P1 symbol (P1) in a partial band. For example, as shown in FIG. 19, when frequency division multiplexing (FDM) is used, a predetermined frequency band (for example, 6 MHz) assigned to a channel is frequency-divided into a plurality of segments.

In the example of Fig. 19, when the horizontal direction is the frequency, the hierarchy (FDM hierarchy) is composed of segments represented by squares in the figure within the frequency band (for example, 6MHz) between the upper frequency limit and the lower frequency limit. It shows that it will be done. In FIG. 19, the frequency is divided into 35 segments.

Here, among the 35 segments, the center segment in the figure is called segment #0, the segments on its left and right are segments #1, #2, and the segments on its left and right are called segment #3, If you repeat #4, the leftmost segment in the diagram (lower frequency limit side) becomes segment #33, and the rightmost segment in the diagram (frequency upper limit side) becomes segment #34. Become.

Furthermore, a hierarchy is configured by grouping one or more segments. In FIG. 19, layer A is composed of nine segments #0 to #8. In addition, a total of 26 segments, including 13 segments #10, #12, ..., #32, #34 and 13 segments #9, #11, ..., #31, #33, create a hierarchy. B (Layer B) is configured.

In this way, a hierarchy is constructed from one or more segments, and data of different broadcasting services can be transmitted for each hierarchy, for example. For example, when receiving data of a broadcast service transmitted in layer A, the receiving device 30 receives only the frequency band of layer A using the partial band filter (FIG. 19).

That is, in the receiving device 30, only the partial band corresponding to layer A is received out of the entire frequency band assigned to the channel, and the frame synchronization symbol (FSS) and the P1 symbol (P1) are received in the partial band. be done. In other words, the partial band corresponding to layer A is 9/35th of the entire frequency band.

Here, the inventor of this technology found that even if the partial band corresponding to layer A is 9/35 of the total band (approximately 1/4 band), g = 0.5 is preferable as the value of g. In order to prove that, we performed a simulation to obtain SNR when FFT size = 1024. The simulation results are shown in FIG.

Note that in FIG. 20, the horizontal axis represents SNR and the vertical axis represents BLER, similarly to FIGS. 14 to 18 described above. Furthermore, FIG. 20 shows simulation results for five patterns. In other words, a, b, c of [a, b, c] expressed by different line types are the number of bits of the frame synchronization symbol (FSS), the number of bits of the first P1 symbol (P1), and the number of bits of the second P1 symbol (P1). Each represents the number of bits of the P1 symbol (P1).

Frame synchronization symbols (FSS) have no information, so they are all 0 bits. Furthermore, the number of bits of the P1 symbol (P1) is set to 4 to 7 bits. That is, for example, [0, 5, 5] is a total of 10 bits of information, including 0 bit FSS, 5 bits P1, and 5 bits P1. Similarly, [0, 5, 4] is 9 bits of information, [0, 4, 4] is 8 bits of information, [0, 6, 6] is 12 bits of information, [0, 7, 7] is 14 bits of information.

In each simulation result in FIG. 20, when BLER = 1.0×10 ^-3 (1.0E-03), SNR = about -4 dB is obtained. That is, for the case of g = 0.5, if we compare the simulation results for the partial band (9/35 band) (Fig. 20) with the simulation results for the entire band mentioned above (Fig. 15), BLER = 1.0 × 10 ^-3 ( 1.0E-03), the SNR has decreased from -7.6dB to about -4dB.

However, an SNR of about -4 dB is usually within the allowable range, and sufficient performance can be obtained. Therefore, even if the partial band corresponding to layer A is 9/35 of the total band, it can be said that g = 0.5 is suitable as the value of g.

Further, based on the various simulation results described above, one symbol can be made into 6 bits when robustness is taken into account. However, in reality, by having a 4-bit backoff, it is possible to operate with a maximum of 10 bits and 6 bits.

On the other hand, if we consider the information to be transmitted from the transmitting device 20 on the transmitting side to the receiving device 30 on the receiving side, 6 bits is insufficient, so two P1 symbols are required. This makes it possible to send information using a 12-bit (6-bit x 2) P1 symbol. The structure of such a P1 symbol is shown in FIG.

That is, in FIG. 21, one physical layer frame includes one frame synchronization symbol (FSS) and two P1 symbols. In this way, it can be seen that it is preferable to use two P1 symbols not only from the viewpoint of efficiency but also from the number of bits per 1 (OFDM) symbol. Note that although Figure 21 shows a configuration with FFT size = 1024 (1K) and a configuration with FFT size = 2048 (2K), it is not possible to obtain sufficient performance with the configuration with FFT size = 1024. As stated above.

The above can be summarized as shown in FIG. 22. Figure 22 shows the FFT size, samples per symbol (Samples Per sym), maximum transmission rate (Max bps), robust transmission rate (Robust bps), number of symbols (#Syms), maximum number of bits (Maxbits), and It shows the relationship between total samples.

That is, in the configuration of the present technology, the value of g is preferably g = 0.5, FFT size = 1024, samples per symbol = 1536, maximum transmission rate = 10bps, robust transmission rate = 6bps, number of symbols = 3. Maximum number of bits = 12 bits (6 bits x 2), total number of samples = 4608 (1536 x 3).

As shown in Figure 12, the number of samples per symbol is 1536 by setting g = 0.5 and halving the length of the frame synchronization symbol (FSS) and P1 symbol (P1). It will be done. Further, as shown in FIG. 12 and the like, the number of symbols is three, with one frame synchronization symbol (FSS) and two P1 symbols (P1) in one physical layer frame. Furthermore, the reason why the maximum number of bits is set to 12 bits is because if one symbol is 6 bits, and considering the information to be sent from the transmitting side to the receiving side, two P1 symbols will be 12 bits.

Also, for example, if the sampling frequency is 6.912MHz, and the FFT size = 1024 (1K), the time per symbol will be 0.222ms (=1/6.912MHz x 1536 samples), so If it is 3 symbols, it will be 0.666ms. On the other hand, in the case of FFT size = 2048 (2K), if the sampling frequency is 6.912MHz, it is 1.33ms (=1/6.912MHz x 3072 samples x 3 (OFDM) symbols). Note that although 6.912 MHz is used here as the sampling frequency, other sampling frequencies may be used.

(5) Composition of P2 symbol (P2)

Next, the structure of the P2 symbol of the physical layer frame will be described with reference to FIGS. 23 to 27. Note that the configuration of the P2 symbol differs depending on the multiplexing method, so the P2 symbols are listed below in the order of time division multiplexing (TDM), frequency division multiplexing (FDM), and layer division multiplexing (LDM). The configuration of is explained.

(Configuration example for TDM)
FIG. 23 is a diagram illustrating a configuration example of a P2 symbol in the case of time division multiplexing (TDM).

The P2 symbol is an OFDM symbol and includes L1B signaling and L1D signaling. Here, FIG. 23 shows a case where one P2 symbol is arranged in one physical layer frame and a case where two P2 symbols are arranged.

When one P2 symbol is placed, fixed length L1B signaling (L1-Basic) is placed from the beginning of the P2 symbol, followed by variable length L1D signaling (L1-Detail). . Furthermore, data (Payload Data) is arranged in the remaining part of the P2 symbol.

On the other hand, when two P2 symbols are arranged, fixed length L1B signaling (L1-Basic) is arranged from the beginning of the first P2 symbol, followed by variable length L1D signaling (L1-Basic). Detail) is placed. Here, since the variable length L1D signaling does not fit within the first P2 symbol, the remaining portion of the L1D signaling is placed in the second P2 symbol. Furthermore, data (Payload Data) is arranged in the remaining part of the second P2 symbol.

In addition, in the case of a configuration in which one or more subframes are arranged in the physical layer frame as shown in Figure 6, all L1 signaling (including L1B signaling and L1D signaling) is transmitted from the first subframe. is also placed in front.

(First configuration example for FDM)
FIG. 24 is a diagram showing a first configuration example of a P2 symbol in the case of frequency division multiplexing (FDM).

Here, FIG. 24 shows a case where one P2 symbol is arranged in one physical layer frame when layer A and layer B are configured using frequency division multiplexing (FDM). , shows a case where two P2 symbols are arranged.

When one P2 symbol is arranged, in the P2 symbol, fixed length L1B signaling (L1-Basic) is arranged from the beginning of the part corresponding to layer A, followed by variable length L1D signaling (L1-Basic). Detail) is placed. Further, in the P2 symbol, data (Payload Data) is arranged in the remaining part of the part corresponding to layer A.

That is, when one P2 symbol is arranged and configured with multiple layers, L1B signaling and L1D signaling are only included in layer A that includes the center segment. Note that in the P2 symbol, only data (payload data) is arranged in the left and right layers B.

On the other hand, when two P2 symbols are arranged, in the first P2 symbol, fixed length L1B signaling (L1-Basic) is arranged from the beginning of the part corresponding to layer A, followed by variable length L1B signaling (L1-Basic). Long L1D signaling (L1-Detail) is arranged.

Here, the variable length L1D signaling does not fit into the part corresponding to layer A of the first P2 symbol, so the remaining part of the L1D signaling corresponds to layer A of the second P2 symbol. placed in parts. Furthermore, in the second P2 symbol, data (Payload Data) is arranged in the remaining part of the part corresponding to layer A.

That is, when two P2 symbols are arranged and configured with multiple layers, L1B signaling and L1D signaling are only included in layer A that includes the center segment. Note that in the two P2 symbols, only data (payload data) is arranged in the left and right layers B.

In this way, when multiple layers are configured by frequency division multiplexing (FDM), L1B signaling is placed in the part corresponding to layer A of the P2 symbol, and Of these, L1D signaling will be placed in the remaining part. At that time, if the L1D signaling does not fit into the part corresponding to layer A of the first P2 symbol, the remaining part of the L1D signaling is moved to the part corresponding to layer A of the second P2 symbol. so that it is placed in

As a result, all L1 signaling (L1B signaling and L1D signaling) is included in the P2 symbol of layer A including the center segment, so in the receiving device 30, the entire frequency band (for example, 6MHz) assigned to the channel L1 signaling can be obtained not only when receiving , but also when receiving only a partial band corresponding to layer A (for example, 9/35 of the total band).

(Second configuration example for FDM)
FIG. 25 is a diagram illustrating a second configuration example of a P2 symbol in the case of frequency division multiplexing (FDM).

Similar to FIG. 24, FIG. 25 shows a case where one P2 symbol is arranged in one physical layer frame and a case where two P2 symbols are arranged when layer A and layer B are configured. It shows.

When one P2 symbol is arranged, in the P2 symbol, fixed length L1B signaling (L1-Basic) is arranged from the beginning of the part corresponding to layer A, followed by variable length L1D signaling (L1-Basic). Detail) is placed. Further, in the P2 symbol, data (Payload Data) is arranged in the remaining part of the part corresponding to layer A.

In addition, in the P2 symbol, variable length L1D signaling (L1-Detail) is placed from the beginning of the part corresponding to one layer B (left layer B), followed by data (Payload Data). Ru. However, this L1D signaling includes only information regarding layer B. Note that in the P2 symbol, only data (Payload Data) is arranged in a portion corresponding to the other layer B (layer B on the right).

On the other hand, when two P2 symbols are arranged, in the first P2 symbol, fixed length L1B signaling (L1-Basic) is arranged from the beginning of the part corresponding to layer A, followed by variable length L1B signaling (L1-Basic). Long L1D signaling (L1-Detail) is arranged.

Here, the variable length L1D signaling does not fit into the part corresponding to layer A of the first P2 symbol, so the remaining part of the L1D signaling corresponds to layer A of the second P2 symbol. placed in parts. Furthermore, in the second P2 symbol, data (Payload Data) is arranged in the remaining part of the part corresponding to layer A.

In addition, in the first P2 symbol, variable length L1D signaling (L1-Detail) is placed from the beginning of the part corresponding to one layer B (left layer B), followed by data (Payload Data ) is placed. However, this L1D signaling includes only information regarding layer B. Note that in the first P2 symbol, only data (Payload Data) is arranged in a portion corresponding to the other layer B (layer B on the right side).

In this way, when multiple layers are configured by frequency division multiplexing (FDM), L1B signaling is placed in the part corresponding to layer A of the P2 symbol, and Of these, L1D signaling will be placed in the remaining part. At that time, if the L1D signaling does not fit into the part corresponding to layer A of the first P2 symbol, the remaining part of the L1D signaling is moved to the part corresponding to layer A of the second P2 symbol. so that it is placed in Furthermore, information regarding layer B in the L1D signaling is placed in a portion corresponding to layer B of the P2 symbol.

Note that although FIG. 25 shows examples of cases in which one P2 symbol is arranged and cases in which two P2 symbols are arranged, it is basically assumed that in most cases one P2 symbol is arranged. be done. That is, by arranging information regarding layer B in the L1D signaling in the portion corresponding to layer B of the P2 symbol, it is possible to reduce the amount of L1D signaling information placed in the portion corresponding to layer A of the P2 symbol. Therefore, by arranging one P2 symbol, it becomes possible to secure an area for arranging all the information of L1D signaling.

The receiving device 30 basically processes one symbol at a time, so when obtaining L1 signaling from two P2 symbols, the first P2 symbol is buffered until the next P2 symbol is processed. need to be retained. On the other hand, if L1 signaling can be obtained from one P2 symbol, as in the configuration shown in the upper part of FIG. 25, there is no need to buffer the P2 symbol, and L1 signaling can be obtained quickly. .

(First configuration example for LDM)
FIG. 26 is a diagram illustrating a first configuration example of a P2 symbol in the case of layer division multiplexing (LDM).

Here, in FIG. 26, one P2 symbol is arranged in one physical layer frame when layer k and layer k+1 are configured by using layer division multiplexing (LDM). This shows the case where two P2 symbols are placed.

When one P2 symbol is arranged, fixed length L1B signaling (L1-Basic) is arranged from the beginning of the P2 symbol of layer k, followed by variable length L1D signaling (L1-Detail). Placed. Furthermore, data (Payload Data) is arranged in the remaining part of the P2 symbol of layer k. Note that only data (Payload Data) is placed in the P2 symbol of layer k+1.

On the other hand, when two P2 symbols are arranged, in the first P2 symbol at layer k, fixed length L1B signaling (L1-Basic) is arranged from the beginning, followed by variable length L1B signaling (L1-Basic). L1D signaling (L1-Detail) is arranged.

Here, in layer k, the variable length L1D signaling does not fit within the first P2 symbol, so it is placed in the second P2 symbol. Further, in the layer k, data (Payload Data) is arranged in the remaining part of the second P2 symbol.

Further, in layer k+1, only data (Payload Data) is arranged in the first P2 symbol and the second P2 symbol.

In this way, when multiple layers are configured using layer division multiplexing (LDM), L1B signaling is placed in the P2 symbol of layer k, and the remaining part of the P2 symbol of layer k is Ensure L1D signaling is in place. At this time, in layer k, if the L1D signaling does not fit within the first P2 symbol, the remaining part of the L1D signaling is placed within the second P2 symbol.

(Second configuration example for LDM)
FIG. 27 is a diagram illustrating a second configuration example of a P2 symbol in the case of layer division multiplexing (LDM).

Similar to FIG. 26, FIG. 27 shows cases in which one P2 symbol is arranged in one physical layer frame and cases in which two P2 symbols are arranged in one physical layer frame when layer k and layer k+1 are configured. This shows the case where

When one P2 symbol is arranged, fixed length L1B signaling (L1-Basic) is arranged from the beginning of the P2 symbol of layer k, followed by variable length L1D signaling (L1-Detail). Placed. Furthermore, data (Payload Data) is arranged in the remaining part of the P2 symbol of layer k.

Furthermore, variable length L1D signaling (L1-Detail) is placed in the P2 symbol of layer k+1 from the beginning, followed by data (Payload Data). However, this L1D signaling includes only information regarding layer k+1.

On the other hand, when two P2 symbols are arranged, in the first P2 symbol at layer k, fixed length L1B signaling (L1-Basic) is arranged from the beginning, followed by variable length L1B signaling (L1-Basic). L1D signaling (L1-Detail) is arranged.

Here, in layer k, the variable length L1D signaling does not fit within the first P2 symbol, so it is placed in the second P2 symbol. Further, in the layer k, data (Payload Data) is arranged in the remaining part of the second P2 symbol.

Furthermore, in the first P2 symbol in layer k+1, variable length L1D signaling (L1-Detail) is arranged from the beginning, followed by data (Payload Data). However, this L1D signaling includes only information regarding layer k+1. Note that in layer k+1, only data (Payload Data) is placed in the second P2 symbol.

In this way, when multiple layers are configured using layer division multiplexing (LDM), L1B signaling is placed in the P2 symbol of layer k, and the remaining part of the P2 symbol of layer k is Ensure L1D signaling is in place. At this time, in layer k, if the L1D signaling does not fit within the first P2 symbol, the remaining part of the L1D signaling is placed within the second P2 symbol. Further, in the L1D signaling, information regarding layer k+1 is placed in the P2 symbol of layer k+1.

The configuration of the physical layer frame to which the present technology is applied has been described above.

<First solution>

As mentioned above, currently there is a problem in that when multiple multiplexing methods (FDM, TDM, LDM) are implemented in the same broadcasting system, it is not possible to distinguish between the multiplexing methods. In the present technology, this problem is solved by the first solution method.

However, as the first solution method, there are two methods, a synchronization pattern solution method and a P1 signaling solution method, so they will be explained below in that order.

(1) Synchronization pattern solving method

First, a synchronization pattern solving method will be described with reference to FIGS. 28 to 36.

The synchronization pattern resolution method is a method for determining multiple multiplexing methods (FDM, TDM, LDM) by using different synchronization patterns with a common frame synchronization symbol (FSS).

FIG. 28 is a diagram illustrating an example of a frame synchronization symbol (FSS) synchronization pattern.

FIG. 28 shows that when the multiplexing method is frequency division multiplexing (FDM), "0x019D" is used as the synchronization pattern of the frame synchronization symbol (FSS). Additionally, when the multiplexing method is time division multiplexing (TDM), "0x00ED" is used as the frame synchronization symbol (FSS) synchronization pattern, and the multiplexing method is layer division multiplexing. (LDM) indicates that "0x01E8" is used as the frame synchronization symbol (FSS) synchronization pattern. In other words, the synchronization pattern becomes information for determining the multiplexing method.

In this way, in the physical layer frame, the synchronization pattern of the frame synchronization symbol (FSS) differs depending on the multiplexing method, so the receiving device 30 uses the synchronization pattern ("0x019D", "0x00ED", "0x01E8 ), the multiplexing scheme can be determined, which is frequency division multiplexing (FDM), time division multiplexing (TDM), or layer division multiplexing (LDM).

Also, here we have shown the frame synchronization symbol (FSS) synchronization pattern assuming that the Zadoff-Chu sequence root q is 137. It can also be a value. However, if the value of q is set to another value, the synchronization pattern of the frame synchronization symbol (FSS) will be a different pattern from the synchronization pattern shown in FIG. 28.

Note that the Zadoff-Chu sequence root q is also described in the above-mentioned Non-Patent Document 2 and the like.

In this way, in the synchronization pattern solving method, a frame synchronization symbol (FSS) synchronization pattern is prepared for each multiplexing method, so it is possible to deal with a large number of multiplexing methods. Note that other multiplexing methods include, for example, a layered time division multiplexing method (LDM_TDM) and a layered frequency division multiplexing method (LDM_FDM). Another advantage of the synchronization pattern solving method is that it does not require the use of the bits of the P1 symbol.

Next, the configuration of P1 signaling when using the synchronization pattern resolution method will be described. The configuration of P1 signaling differs depending on the multiplexing method, so below, P1 signaling will be classified in the following order: time division multiplexing (TDM), frequency division multiplexing (FDM), and layer division multiplexing (LDM). The configuration of is explained.

(1a) Time division multiplexing (TDM)

(Example of P1 signaling)
FIG. 29 is a diagram illustrating an example of the syntax of P1 signaling in the case of time division multiplexing (TDM).

In FIG. 29, P1 signaling includes P1_P2_waveform_structure, P1_eas_wake_up, P1_band_width, and P1_Reserved.

7-bit P1_P2_waveform_structure represents the structure of P1 and P2 symbols. This P1_P2_waveform_structure includes information that combines FFT size, GI (Guard Interval), FEC (Forward Error Correction) type, and pilot pattern (SPP: SP pattern).

1 bit P1_eas_wake_up represents an emergency alert flag.

The 2-bit P1_band_width represents the bandwidth of the broadcast signal.

The 2-bit P1_Reserved represents the area for future expansion.

Note that if uimsbf (unsigned integer most significant bit first) is specified as the format, it means that bitwise operations are performed and the number is treated as an integer. This format is the same for other syntaxes described below.

(Example of P1_P2_waveform_structure)
FIG. 30 is a diagram showing an example of P1_P2_waveform_structure in FIG. 29.

If "0000000" is specified as the value of P1_P2_waveform_structure, FFT size = 8K, GI = 256, FEC type = 1, pilot pattern = 16_2.

If "0000001" is specified as the value of P1_P2_waveform_structure, FFT size = 8K, GI = 256, FEC type = 1, pilot pattern = 16_4.

If "0000010" is specified as the value of P1_P2_waveform_structure, FFT size = 8K, GI = 512, FEC type = 1, pilot pattern = 12_2.

Note that in the example of FIG. 30, all values of P1_P2_waveform_structure are not listed, but combinations of FFT size, GI, FEC type, and pilot pattern are similarly assigned to other values of P1_P2_waveform_structure. For example, if "1000010" is specified as the value of P1_P2_waveform_structure, FFT size = 32K, GI = 2048, FEC type = 2, and pilot pattern = 6_2.

However, it is not necessary to list all combinations in P1_P2_waveform_structure, and only the combinations used in actual operations need be defined. For example, in the example of FIG. 30, as will be described later, there are 34 combinations of FFT size, GI, and pilot pattern, but it is not necessary to multiply all FEC types.

Furthermore, approximately one FEC type may be used for the FFT size, GI, and pilot pattern. However, when the number of parameters is small, it is possible to prepare both FEC types, FEC type 1 (FEC type = 1) and FEC type 2 (FEC type = 2).

(1b) Frequency division multiplexing (FDM)

(Example of P1 signaling)
FIG. 31 is a diagram illustrating an example of syntax of P1 signaling in the case of frequency division multiplexing (FDM).

In FIG. 31, P1 signaling includes P1_P2_waveform_structure, P1_eas_wake_up, P1_band_width, and P1_Reserved.

The 7-bit P1_P2_waveform_structure includes information that combines the FFT size, GI, FEC type, pilot pattern, and number of layer A segments as a structure of P1 and P2 symbols. Note that this layer A is a layer that includes the center segment, as shown in FIGS. 7 and 8 described above.

Note that in FIG. 31, P1_eas_wake_up, P1_band_width, and P1_Reserved are the same as those shown in FIG. 29, so their explanations will be omitted.

(Example of P1_P2_waveform_structure)
FIG. 32 is a diagram showing an example of P1_P2_waveform_structure in FIG. 31.

When "0000000" is specified as the value of P1_P2_waveform_structure, FFT size = 8K, GI = 256, FEC type = 1, pilot pattern = 16_2, and number of segments in layer A = 9.

When "0000001" is specified as the value of P1_P2_waveform_structure, FFT size = 8K, GI = 256, FEC type = 1, pilot pattern = 16_2, and number of segments in layer A = 7.

When "0000010" is specified as the value of P1_P2_waveform_structure, FFT size = 8K, GI = 256, FEC type = 1, pilot pattern = 16_2, and number of segments in layer A = 3.

When "0000011" is specified as the value of P1_P2_waveform_structure, FFT size = 8K, GI = 256, FEC type = 1, pilot pattern = 16_2, and number of segments in layer A = 1.

When "0000100" is specified as the value of P1_P2_waveform_structure, FFT size = 8K, GI = 256, FEC type = 1, pilot pattern = 16_4, and number of segments in layer A = 9.

In the example of FIG. 32, all the values of P1_P2_waveform_structure are not listed, but the combinations of FFT size, GI, FEC type, pilot pattern, and number of segments of layer A are similarly set for other P1_P2_waveform_structure values. Assigned.

For example, when "0010010" is specified as the value of P1_P2_waveform_structure, FFT size = 16K, GI = 1024, FEC type = 1, pilot pattern = 12_2, and number of segments in layer A = 3. Further, for example, when "0010011" is specified as the value of P1_P2_waveform_structure, FFT size = 16K, GI = 1024, FEC type = 1, pilot pattern = 12_2, and number of segments in layer A = 9.

Further, for example, if "1000010" is specified as the value of P1_P2_waveform_structure, FFT size = 32K, GI = 2048, FEC type = 2, pilot pattern = 6_2, and number of segments in layer A = 9.

However, it is not necessary to list all combinations in P1_P2_waveform_structure, and only the combinations used in actual operations need be defined. For example, in the example of FIG. 32, the combination of FFT size, GI, and pilot pattern is 34 patterns, as described later, but it is not necessary to multiply all FEC types and the number of segments of layer A. For example, if 9 segments and 3 segments are mainly used as the number of segments in layer A, it is only necessary to define combinations regarding 9 segments and 3 segments.

(1c) Layer division multiplexing method (LDM)
FIG. 33 is a diagram illustrating an example of the syntax of P1 signaling in the case of layer division multiplexing (LDM).

In FIG. 33, P1 signaling includes P1_P2_waveform_structure, P1_eas_wake_up, P1_band_width, and P1_Reserved.

The 7-bit P1_P2_waveform_structure includes information on a combination of FFT size, GI, FEC type, and pilot pattern as a structure of P1 and P2 symbols.

Note that in FIG. 33, P1_eas_wake_up, P1_band_width, and P1_Reserved are the same as those shown in FIG. 29, so their explanations will be omitted.

(Example of P1_P2_waveform_structure)
FIG. 34 is a diagram showing an example of P1_P2_waveform_structure in FIG. 33.

If "0000000" is specified as the value of P1_P2_waveform_structure, FFT size = 8K, GI = 256, FEC type = 1, pilot pattern = 16_2.

If "0000001" is specified as the value of P1_P2_waveform_structure, FFT size = 8K, GI = 256, FEC type = 1, pilot pattern = 16_4.

If "0000010" is specified as the value of P1_P2_waveform_structure, FFT size = 8K, GI = 512, FEC type = 1, pilot pattern = 12_2.

Note that in the example of FIG. 34, although not all values of P1_P2_waveform_structure are listed, combinations of FFT size, GI, FEC type, and pilot pattern are similarly assigned to other values of P1_P2_waveform_structure. For example, if "1000010" is specified as the value of P1_P2_waveform_structure, FFT size = 32K, GI = 2048, FEC type = 2, and pilot pattern = 6_2.

However, it is not necessary to list all combinations in P1_P2_waveform_structure, and only the combinations used in actual operations need be defined. For example, in the example of FIG. 34, as described later, there are 34 combinations of FFT size, GI, and pilot pattern, but it is not necessary to multiply all FEC types.

Furthermore, approximately one FEC type may be used for the FFT size, GI, and pilot pattern. However, when the number of parameters is small, it is possible to prepare both FEC types, FEC type 1 (FEC type = 1) and FEC type 2 (FEC type = 2).

(1d) Combination of FFT, GI, PP and example of FEC type

(Example of combination of FFT, GI, PP)
Here, details of the combination of FFT size, GI, and pilot pattern in the above-mentioned P1_P2_waveform_structure will be explained.

FIG. 35 is a diagram showing an example of a combination of FFT size and GI.

In Figure 35, GI samples are shown when the FFT size is 8K, 16K, and 32K, and the GI is 1/128, 1/64, 1/32, 1/16, 1/8, and 1/4. It shows the number. That is, the number of GI samples is 256, 512, 1024, and 2048.

FIG. 36 is a diagram showing an example of a combination of FFT size, GI, and pilot pattern.

In FIG. 36, pilot patterns corresponding to FFT sizes of 8K, 16K, and 32K are associated with each GI pattern (GI Pattern) corresponding to the number of GI samples (Sample).

That is, seven pilot patterns correspond to GI_256: SP16_2 and SP16_4 of 8K FFT, SP32_2, SP32_4, SP16_2, SP16_4 of 16K FFT, and SP32_2 of 32K FFT. Furthermore, nine pilot patterns correspond to GI3_512: SP12_2, SP12_4, SP6_2, SP6_4 of 8K FFT, SP24_2, SP24_4, SP12_2, SP12_4 of 16K FFT, and SP24_2 of 32K FFT.

Furthermore, GI5_1024 corresponds to 10 pilot patterns: SP6_2, SP6_4, SP3_2, SP3_4 of 8K FFT, SP12_2, SP12_4, SP6_2, SP6_4 of 16K FFT, and SP24_2, SP12_2 of 32K FFT. Furthermore, GI7_2048 corresponds to eight pilot patterns: SP3_2 and SP3_4 of 8K FFT, SP6_2, SP6_4, SP3_2, SP3_4 of 16K FFT, and SP12_2 and SP6_2 of 32K FFT.

As described above, as shown in FIGS. 35 and 36, there are a total of 34 combinations of FFT size, GI, and pilot pattern.

(Example of FEC type)
Further, as the FEC type, FEC type 1 (FEC type = 1) and FEC type 2 (FEC type = 2) can be used.

FEC type 1 is a very robust FEC. Here, for example, QPSK+CR=3/15 can be used as the modulation method. Note that this FEC type 1 corresponds to "L1-Basic Mode 2" of ATSC3.0. Further, the required C/N (Carrier to Noise Ratio) is approximately -2.0 dB.

FEC type 2 is FEC used when efficiency is given priority. Here, for example, 64QAM+CR=3/15 can be used as the modulation method. Note that this FEC type 2 corresponds to "L1-Basic Mode 5" of ATSC3.0. Further, the required C/N is approximately 10 dB.

Note that although FEC type 1 and FEC type 2 are illustrated here as examples of FEC types, other FEC types may be used.

(2) P1 signaling solution method

Next, the P1 signaling solution method will be described with reference to FIGS. 37 to 42.

The P1 signaling solution method uses a common frame synchronization symbol (FSS) and the same synchronization pattern, but by using P1 signaling information in the P1 symbol, multiple multiplexing schemes (FDM, TDM, LDM) can be used. This is a method for determining.

In other words, the P1 signaling solution method uses the same synchronization pattern to perform frame synchronization symbols (FSS), rather than using different synchronization patterns for the frame synchronization symbols (FSS) as in the synchronization pattern solution method described above. Completely standardized.

On the other hand, in P1 signaling, one of frequency division multiplexing (FDM), time division multiplexing (TDM), or layer division multiplexing (LDM) is used as discrimination information for determining the multiplexing method. Specify clearly. For example, "00" represents frequency division multiplexing (FDM), "01" represents time division multiplexing (TDM), and "10" represents layer division multiplexing. (LDM).

The receiving device 30 uses frequency division multiplexing (FDM), time division multiplexing (TDM), or layer division multiplexing based on the P1 signaling discrimination information ("00", "01", "10"). The multiplexing method (LDM) can be determined.

In this way, in the P1 signaling solution method, the multiplexing method is determined based on the P1 signaling determination information, so the search time can be shortened.

Next, the configuration of P1 signaling when using the P1 signaling solution method will be described. The configuration of P1 signaling differs depending on the multiplexing method, so below, P1 signaling will be classified in the following order: time division multiplexing (TDM), frequency division multiplexing (FDM), and layer division multiplexing (LDM). The configuration of is explained.

(2a) Time division multiplexing (TDM)

(Example of P1 signaling)
FIG. 37 is a diagram illustrating an example of the syntax of P1 signaling in the case of time division multiplexing (TDM).

In FIG. 37, P1 signaling includes P1_P2_waveform_structure, P1_eas_wake_up, P1_band_width, and P1_Frame_Multiplexing.

The 7-bit P1_P2_waveform_structure includes information on a combination of FFT size, GI, FEC type, and pilot pattern as a structure of P1 and P2 symbols. Note that as this P1_P2_waveform_structure, for example, information on the combination shown in FIG. 30 can be defined.

1 bit P1_eas_wake_up represents an emergency alert flag.

The 2-bit P1_band_width represents the bandwidth of the broadcast signal.

The 2-bit P1_Frame_Multiplexing represents information for determining the multiplexing method, such as frequency division multiplexing (FDM), time division multiplexing (TDM), or layer division multiplexing (LDM).

(Example of P1_Frame_Multiplexing)
FIG. 38 is a diagram showing an example of P1_Frame_Multiplexing in FIG. 37.

When "00" is specified as the value of P1_Frame_Multiplexing, it means that the multiplexing method is frequency division multiplexing (FDM).

When "01" is specified as the value of P1_Frame_Multiplexing, it means that the multiplexing method is time division multiplexing (TDM).

When "10" is specified as the value of P1_Frame_Multiplexing, it means that the multiplexing method is layer division multiplexing (LDM).

Note that the value of P1_Frame_Multiplexing, which is "11", is an area for future expansion.

(2b) Frequency division multiplexing (FDM)

(Example of P1 signaling)
FIG. 39 is a diagram illustrating an example of syntax of P1 signaling in the case of frequency division multiplexing (FDM).

In FIG. 39, P1 signaling includes P1_P2_waveform_structure, P1_eas_wake_up, P1_band_width, and P1_Frame_Multiplexing.

The 7-bit P1_P2_waveform_structure includes information that combines the FFT size, GI, FEC type, pilot pattern, total number of segments, and number of layer A segments as a structure of P1 and P2 symbols. Note that as this P1_P2_waveform_structure, for example, information on the combination shown in FIG. 32 can be defined.

Note that in FIG. 39, P1_eas_wake_up, P1_band_width, and P1_Frame_Multiplexing are the same as those shown in FIG. 37. That is, P1_Frame_Multiplexing represents information for determining the multiplexing method.

(Example of P1_Frame_Multiplexing)
FIG. 40 is a diagram showing an example of P1_Frame_Multiplexing in FIG. 39.

In FIG. 40, as in FIG. 38, "00" is specified as P1_Frame_Multiplexing in the case of frequency division multiplexing (FDM), and "01" is specified in the case of time division multiplexing (TDM). is specified, and in the case of layer division multiplexing (LDM), "10" is specified.

(2c) Layer division multiplexing method (LDM)

(Example of P1 signaling)
FIG. 41 is a diagram illustrating an example of the syntax of P1 signaling in the case of layer division multiplexing (LDM).

In FIG. 41, P1 signaling includes P1_P2_waveform_structure, P1_eas_wake_up, P1_band_width, and P1_Frame_Multiplexing.

The 7-bit P1_P2_waveform_structure includes information on a combination of FFT size, GI, FEC type, and pilot pattern as a structure of P1 and P2 symbols. Note that as this P1_P2_waveform_structure, for example, information on the combination shown in FIG. 34 can be defined.

Note that in FIG. 41, P1_eas_wake_up, P1_band_width, and P1_Frame_Multiplexing are the same as those shown in FIG. 37. That is, P1_Frame_Multiplexing represents information for determining the multiplexing method.

(Example of P1_Frame_Multiplexing)
FIG. 42 is a diagram showing an example of P1_Frame_Multiplexing in FIG. 41.

In FIG. 42, as in FIG. 38, "00" is specified as P1_Frame_Multiplexing in the case of frequency division multiplexing (FDM), and "01" is specified in the case of time division multiplexing (TDM). is specified, and in the case of layer division multiplexing (LDM), "10" is specified.

The first solution method has been explained above.

<P2 signaling configuration>

Next, L1B signaling (L1-Basic) and L1D signaling (L1-Detail) will be described as P2 signaling of P2 symbols with reference to FIGS. 43 to 59.

Here, there are, for example, the following differences between L1B signaling and L1D signaling. That is, L1B signaling has a fixed length, and L1D signaling has a variable length. Therefore, L1B signaling and L1D signaling are different in size. Usually, the size of L1D signaling is larger than the size of L1B signaling.

Furthermore, since L1B signaling and L1D signaling are read out in that order, L1B signaling is read out earlier than L1D signaling. Furthermore, L1B signaling differs from L1D signaling in that it can be transmitted more robustly.

(1) L1B signaling configuration

First, the configuration of L1B signaling will be described with reference to FIGS. 43 to 47. Note that the configuration of L1B signaling differs depending on the multiplexing method, so the L1B signaling is explained below in the order of time division multiplexing (TDM), frequency division multiplexing (FDM), and layer division multiplexing (LDM). The configuration of is explained.

(1a) Time division multiplexing (TDM)

(Example of L1B signaling)
FIG. 43 is a diagram illustrating an example of the syntax of L1B signaling in the case of time division multiplexing (TDM).

In FIG. 43, L1B signaling includes L1B_version, L1B_eas-wake_up, L1B_lls_flag, L1B_time_info_flag, L1B_L1_Detail_size_bytes, L1B_L1_Detail_fec_type, L1B_reserved, and L1B_crc.

The 3-bit L1B_version represents the version of L1B signaling.

1 bit L1B_eas-wake_up represents an emergency alert flag.

1-bit L1B_lls_flag represents a flag indicating the presence of upper layer signaling. For example, when LLS (Low Level Signaling) is defined as upper layer signaling, the flag indicates whether LLS exists.

The 1-bit L1B_time_info_flag represents a time information flag.

8-bit L1B_L1_Detail_size_bytes represents the size of L1D signaling.

The 2-bit L1B_L1_Detail_fec_type represents the FEC type of L1D signaling.

The 80-bit L1B_reserved represents an area for future expansion.

The 32-bit L1B_crc represents error detection parity.

(1b) Frequency division multiplexing (FDM)

(Example of L1B signaling)
FIG. 44 is a diagram illustrating an example of the syntax of L1B signaling in the case of frequency division multiplexing (FDM).

In FIG. 44, L1B signaling includes L1B_version, L1B_eas-wake_up, L1B_lls_flag, L1B_time_info_flag, L1B_num_layers, L1B_L1_Detail_size_bytes, L1B_L1_Detail_fec_type, L1B_reserved, and L1B_crc.

In FIG. 44, L1B_version, L1B_eas-wake_up, L1B_lls_flag, L1B_time_info_flag, L1B_L1_Detail_size_bytes, L1B_L1_Detail_fec_type, L1B_reserved, and L1B_crc are the same as those shown in FIG. 43. That is, the L1B signaling in FIG. 44 has L1B_num_layers added compared to that in FIG. 43.

The 2-bit L1B_num_layers represents the number of layers (FDM layers).

Note that in FIG. 44, the number of bits of L1B_reserved is 78 bits.

(1c) Layer division multiplexing method (LDM)

(Example of L1B signaling)
FIG. 45 is a diagram illustrating an example of the syntax of L1B signaling in the case of layer division multiplexing (LDM).

In FIG. 45, L1B signaling includes L1B_version, L1B_eas-wake_up, L1B_lls_flag, L1B_time_info_flag, L1B_num_layers, L1B_L1_Detail_size_bytes, L1B_L1_Detail_fec_type, L1B_reserved, and L1B_crc.

In FIG. 45, L1B_version, L1B_eas-wake_up, L1B_lls_flag, L1B_time_info_flag, L1B_L1_Detail_size_bytes, L1B_L1_Detail_fec_type, L1B_reserved, and L1B_crc are the same as those shown in FIG. 43. That is, the L1B signaling in FIG. 45 has L1B_num_layers added compared to that in FIG. 43.

The 2-bit L1B_num_layers represents the number of layers (LDM layers).

(1d) Example of common use among TDM, FDM, and LDM

Here, the P1 signaling of TDM, FDM, and LDM shown in FIGS. 37 to 42 and the L1B signaling of TDM, FDM, and LDM shown in FIGS. 43 to 45 are the multiplexing methods of TDM, FDM, and LDM. It is clear from the example syntax of P1 signaling and L1B signaling described above that they can be configured in almost the same way.

In other words, in time division multiplexing (TDM), information about layers is not necessarily essential information, but if information about layers can be included in time division multiplexing (TDM) signaling, frequency division multiplexing This method can be used in common with multiplexing method (FDM) and layer division multiplexing method (LDM). Note that in time division multiplexing (TDM), if subframes are not used, num_layers can be used as is.

(Example of P1 signaling)
FIG. 46 is a diagram showing an example of the syntax of P1 signaling when shared by TDM, FDM, and LDM.

In FIG. 46, P1 signaling includes P1_P2_waveform_structure, P1_eas_wake_up, P1_band_width, and P1_Frame_Multiplexing.

The meaning of the 7-bit P1_P2_waveform_structure differs depending on the multiplexing method: frequency division multiplexing (FDM), time division multiplexing (TDM), and layer division multiplexing (LDM).

That is, in the case of time division multiplexing (TDM), P1_P2_waveform_structure includes information that combines FFT size, GI, FEC type, and pilot pattern.

Furthermore, in the case of frequency division multiplexing (FDM), P1_P2_waveform_structure includes information that combines the FFT size, GI, FEC type, pilot pattern, total number of segments, and number of layer A segments. Furthermore, in the case of layered division multiplexing (LDM), P1_P2_waveform_structure includes information that combines FFT size, GI, FEC type, and pilot pattern.

These multiplexing methods (FDM, TDM, LDM) can be determined by the value of P1_Frame_Multiplexing. Note that the value of P1_Frame_Multiplexing is the same as that shown in FIG. 38 and the like.

(Example of L1B signaling)
FIG. 47 is a diagram showing an example of the syntax of L1B signaling when shared by TDM, FDM, and LDM.

In FIG. 47, L1B signaling includes L1B_version, L1B_eas-wake_up, L1B_lls_flag, L1B_time_info_flag, L1B_num_layers, L1B_L1_Detail_size_bytes, L1B_L1_Detail_fec_type, L1B_reserved, and L1B_crc.

In FIG. 47, L1B_version, L1B_eas-wake_up, L1B_lls_flag, L1B_time_info_flag, L1B_L1_Detail_size_bytes, L1B_L1_Detail_fec_type, L1B_reserved, and L1B_crc are the same as those shown in FIG. 43. That is, the L1B signaling in FIG. 47 has L1B_num_layers added compared to FIG. 43.

The 2-bit L1B_num_layers represents the number of layers.

However, in the case of frequency division multiplexing (FDM), L1B_num_layers represents the number of layers (FDM layers). Furthermore, in the case of layer division multiplexing (LDM), L1B_num_layers represents the number of layers (LDM layers). Note that in the case of time division multiplexing (TDM), L1B_num_layers is not necessarily essential information, and is left unused when unnecessary.

(2) L1D signaling configuration

Next, the configuration of L1D signaling will be described with reference to FIGS. 48 to 59. Note that the configuration of L1D signaling differs depending on the multiplexing method, so the L1D signaling is explained below in the order of time division multiplexing (TDM), frequency division multiplexing (FDM), and layer division multiplexing (LDM). The configuration of is explained.

(2a) Time division multiplexing (TDM)

(First example of L1D signaling)
FIG. 48 is a diagram illustrating a first example of L1D signaling syntax in the case of time division multiplexing (TDM).

The L1D signaling in FIG. 48 corresponds to the P2 signaling of the P2 symbol of the physical layer frame corresponding to the subframe shown in FIG. 6.

The 4-bit L1D_version represents the version of L1D signaling.

When L1B_time_info_flag of L1B signaling indicates that time information exists, 64-bit L1D_ntp_time is written. L1D_ntp_time represents time information.

Here, for example, when MMT (MPEG Media Transport) is used as the upper layer transport protocol, time information in NTP (Network Time Protocol) format can be used as the time information. Note that the format of the time information is not limited to the NTP format, and other formats such as PTP (Precision Time Protocol) may be used.

When P1_eas_wake_up of P1 signaling indicates that an emergency alert exists, an 8-bit L1B_eas_code is written. L1B_eas_code represents code information of emergency alert.

The 2-bit L1D_num_subframes represents the number of subframes. L1D_fft_size, L1D_guard_interval, L1D_scattered_pilot_pattern, L1D_pilot_pattern_boost, L1D_num_ofdm_symbols, L1D_bs_first, L1D_bs_last, and L1D_fcs_null_cells are written in the subframe loop according to the number indicated by this L1D_num_subframes.

Since these parameters can be specified for each subframe, the modulation parameters can be changed for each subframe.

Among these parameters, for example, the 2-bit L1D_fft_size represents the FFT size of the target subframe. Further, for example, 2-bit L1D_guard_interval and 5-bit L1D_scattered_pilot_pattern represent the guard interval and pilot pattern of the target subframe.

The 2-bit L1D_num_layers_plp represents the number of PLP (Physical Layer Pipe) layers. In the PLP loop according to the number indicated by this L1D_num_layers_plp, there are L1D_plp_id, L1D_plp_lls_flag, L1D_plp_start, L1D_plp_size, L1D_plp_mod, L1D_plp_cod, L1D_plp_type, L1D_plp_TI_num_ti_blocks, L1D_plp_TI_num_fec_blocks. _max is written.

Since these parameters can be specified for each PLP in each subframe, modulation parameters can be changed for each PLP in a subframe.

Among these parameters, for example, the 4-bit L1D_plp_id represents the ID of the target PLP. Further, for example, 4-bit L1D_plp_mod, 4-bit L1D_plp_cod, and 1-bit L1D_plp_type represent the modulation method, coding rate, and type of the target PLP, respectively.

After exiting the PLP loop and subframe loop, L1D_reserved and L1D_crc are written. L1D_reserved represents an area for future expansion. The 32-bit L1D_crc represents error detection parity.

FIG. 49 is a diagram illustrating a second example of L1D signaling syntax in the case of time division multiplexing (TDM).

The L1D signaling in FIG. 49 corresponds to the P2 signaling of the P2 symbol of the physical layer frame that does not correspond to the subframe shown in FIG. Therefore, in the L1D signaling of FIG. 49, the description of the subframe loop is deleted compared to the L1D signaling of FIG. 48.

That is, in the L1D signaling of FIG. 49, the following parameters are described in the hierarchical loop according to the number indicated by L1B_num_layers of the L1B signaling.

That is, within this hierarchical loop, L1D_fft_size, L1D_guard_interval, L1D_scattered_pilot_pattern, L1D_pilot_pattern_boost, L1D_num_ofdm_symbols, L1D_bs_first, L1D_bs_last, L1D_fcs_null_cells, L1D_plp_id, L1D_plp_lls_flag, L1D _plp_start, L1D_plp_size, L1D_plp_mod, L1D_plp_cod, L1D_plp_type, L1D_plp_TI_num_ti_blocks, and L1D_plp_TI_num_fec_blocks_max are described.

Since these parameters overlap with the L1D signaling parameters in FIG. 48, their description will be omitted here.

(2b) Frequency division multiplexing (FDM)

(First example of L1D signaling)
In the first example, a single L1D signaling includes information specific to each layer of layer A and layer B (FDM layer) and information common to layers A and B (FDM layer). do it like this.

FIG. 50 is a diagram illustrating a first example of L1D signaling syntax in the case of frequency division multiplexing (FDM).

In the L1D signaling in FIG. 50, L1D_version, L1D_ntp_time, L1B_eas_code, L1D_num_ofdm_symbols, L1D_bs_present, L1D_bs_null_cells, L1D_scattered_pilot_pattern, L1D_scattered_pilot_boost, and L1D_num_layers are described as information common to layer A and layer B.

Furthermore, in the L1D signaling in FIG. 50, the following parameters are described in the hierarchical loop according to the number indicated by L1B_num_layers in the L1B signaling.

That is, in this hierarchical loop, L1D_numsegs, L1D_layer_id, L1D_plp_lls_flag, L1D_plp_mod, L1D_plp_cod, L1D_plp_TI_num_ti_blocks, and L1D_plp_TI_num_fec_blocks_max are written. The parameters within this layer loop are described as information specific to each layer, layer A and layer B. Note that 6-bit L1D_numsegs represents the number of segments in each layer.

In this way, the L1D signaling in FIG. 50 describes information unique to each layer, layer A and layer B, as well as information common to each layer, layer A and layer B.

(Second example of L1D signaling)
In the second example, L1D signaling is prepared for each layer (FDM layer) of layer A and layer B, and information specific to each layer is written. At this time, information common between the layers A and B is included in the L1D signaling of one of the layers, but not included in the L1D signaling of the other layers. That is, in the second example, information common between layer A and layer B is included only in layer A's L1D signaling.

FIG. 51 is a diagram illustrating a second example (layer A) of L1D signaling syntax in the case of frequency division multiplexing (FDM).

Since the L1D signaling in FIG. 51 describes information unique to layer A, the description of the layer loop is deleted compared to the L1D signaling in FIG. 50, and parameters for layer A are described instead of all layers. be done.

That is, in the L1D signaling in FIG. 51, information unique to layer A is described in L1D_numsegs, L1D_layer_id, L1D_plp_lls_flag, L1D_plp_mod, L1D_plp_cod, L1D_plp_TI_num_ti_blocks, and L1D_plp_TI_num_fec_blocks_max.

Further, information common between layer A and layer B is described in the L1D signaling in FIG. 51. That is, in the L1D signaling in FIG. 51, L1D_version, L1D_ntp_time, L1B_eas_code, L1D_num_ofdm_symbols, L1D_bs_present, L1D_bs_null_cells, L1D_scattered_pilot_pattern, L1D_scattered_pilot_boost, and L1D_num_layers are described as common information between layer A and layer B. .

In this way, the L1D signaling in FIG. 51 describes information specific to layer A as well as information common to each layer, layer A and layer B.

FIG. 52 is a diagram showing a second example (layer B) of the syntax of L1D signaling in the case of frequency division multiplexing (FDM).

In the L1D signaling in FIG. 52, information specific to layer B is described in L1D_numsegs, L1D_layer_id, L1D_plp_lls_flag, L1D_plp_mod, L1D_plp_cod, L1D_plp_TI_num_ti_blocks, and L1D_plp_TI_num_fec_blocks_max.

As mentioned above, information common between layer A and layer B is described in the L1D signaling of layer A (Figure 51), so it is not necessary to describe it in the L1D signaling of layer B (Figure 52). .

In this way, only information specific to layer B is described in the L1D signaling in FIG. 52.

(Third example of L1D signaling)
In the third example, L1D signaling is prepared for each layer (FDM layer) of layer A and layer B, and information unique to each layer is written. At this time, information common between layers such as layer A and layer B is included in L1D signaling of all layers. That is, in the third example, information common between layer A and layer B is included in both layer A L1D signaling and layer B L1D signaling.

FIG. 53 is a diagram illustrating a third example (layer A) of L1D signaling syntax in the case of frequency division multiplexing (FDM).

In the L1D signaling in FIG. 53, information specific to layer A is described in L1D_numsegs, L1D_layer_id, L1D_plp_lls_flag, L1D_plp_mod, L1D_plp_cod, L1D_plp_TI_num_ti_blocks, and L1D_plp_TI_num_fec_blocks_max.

In the L1D signaling of FIG. 53, the L1D_version, L1d_ntp_time, L1b_Eas_code, L1d_num_ofdm_symbols, L1d_bs_pressent, L1d_bs_pressent, L1d_bs_cell, L1d_bs_cell S, l1d_scattered_pilot_pattern, l1d_scattered_pilot_boost, l1d_num_layers are described.

In this way, the L1D signaling in FIG. 53 describes information specific to layer A as well as information common to each layer, layer A and layer B.

FIG. 54 is a diagram showing a third example (layer B) of the syntax of L1D signaling in the case of frequency division multiplexing (FDM).

In the L1D signaling in FIG. 54, information unique to layer B is described in L1D_numsegs, L1D_layer_id, L1D_plp_lls_flag, L1D_plp_mod, L1D_plp_cod, L1D_plp_TI_num_ti_blocks, and L1D_plp_TI_num_fec_blocks_max.

In the L1D signaling of FIG. 54, the L1D_version, L1d_ntp_time, L1B_EAS_CODE, L1d_num_ofdm_symbols, L1d_bs_pressent, L1d_bs_pressent, L1d_bs_cell, l1d_bs_pressent, l1d_bs_pressent, l1d_bs_pressent S, l1d_scattered_pilot_pattern, l1d_scattered_pilot_boost, l1d_num_layers are described.

In this way, the L1D signaling in FIG. 54 describes information specific to layer B as well as information common to each layer, layer A and layer B.

(2c) Layer division multiplexing method (LDM)

(First example of L1D signaling)
In the first example, a single L1D signaling contains information specific to each layer (LDM layer) of layer k and layer k+1 and information common to layers k and layer k+1 (LDM layer). and should be included.

FIG. 55 is a diagram illustrating a first example of L1D signaling syntax in the case of layer division multiplexing (LDM).

The L1D signaling of FIG. 55 has a common information between hierarchy K and hierarchy K+1, as common information for L1d_version, L1d_ntp_time, L1b_Eas_code, L1d_num_ofdm_symbols, L1d_bs_pressent, L1d_bs_pressent, L1d_bs_cel. LS, l1d_scattered_pilot_pattern, l1d_scattered_pilot_boost, l1d_num_layers are described.

Furthermore, in the L1D signaling in FIG. 55, the following parameters are described in the hierarchical loop according to the number indicated by L1B_num_layers in the L1B signaling.

That is, within this hierarchical loop, L1D_layer_id, L1D_plp_lls_flag, L1D_plp_mod, L1D_plp_cod, L1D_plp_TI_num_ti_blocks, and L1D_plp_TI_num_fec_blocks_max are described. The parameters within this hierarchical loop are described as information unique to each of the layers k and k+1.

In this way, the L1D signaling in FIG. 55 describes information unique to each of the layers k and k+1, as well as information common to each layer k and k+1.

(Second example of L1D signaling)
In the second example, L1D signaling is prepared for each layer (LDM layer) of layer k and layer k+1, and information specific to each layer is described. At this time, information common between the layers k and k+1 is included in the L1D signaling of one of the layers, but not included in the L1D signaling of the other layers. That is, in the second example, the information common between layer k and layer k+1 is included only in the L1D signaling of layer k.

FIG. 56 is a diagram showing a second example (layer k) of the syntax of L1D signaling in the case of layer division multiplexing (LDM).

Since the L1D signaling in FIG. 56 describes information unique to layer k, the description of the layer loop is deleted compared to the L1D signaling in FIG. 55, and the parameters for layer k are described instead of all layers. be done.

That is, in the L1D signaling in FIG. 56, information unique to layer k is described in L1D_layer_id, L1D_plp_lls_flag, L1D_plp_mod, L1D_plp_cod, L1D_plp_TI_num_ti_blocks, and L1D_plp_TI_num_fec_blocks_max.

Further, information common between layer k and layer k+1 is described in the L1D signaling in FIG. 56. That is, in the L1D signaling in FIG. 56, L1D_version, L1D_ntp_time, L1B_eas_code, L1D_num_ofdm_symbols, L1D_bs_present, L1D_bs_null_cells, L1D_scattered_pilot_pattern, L1D_scattered_pilot_boost, and L1D_num_layers are common information between layer k and layer k+1. Described.

In this way, the L1D signaling in FIG. 56 describes information specific to layer k as well as information common to each layer, layer k and layer k+1.

FIG. 57 is a diagram showing a second example (layer k+1) of the syntax of L1D signaling in the case of layer division multiplexing (LDM).

In the L1D signaling in FIG. 57, information specific to layer k+1 is described in L1D_layer_id, L1D_plp_lls_flag, L1D_plp_mod, L1D_plp_cod, L1D_plp_TI_num_ti_blocks, and L1D_plp_TI_num_fec_blocks_max.

As mentioned above, the information common between layer k and layer k+1 is described in the L1D signaling of layer k (Figure 56), so the information that is common between layer k and layer k+1 is described in the L1D signaling of layer k+1 (Figure 57). is not necessary.

In this way, only information specific to layer k+1 is described in the L1D signaling in FIG. 57.

(Third example of L1D signaling)
In the third example, L1D signaling is prepared for each layer (LDM layer) of layer k and layer k+1, and information specific to each layer is described. At that time, information common between layers such as layer k and layer k+1 is included in the L1D signaling of all layers. That is, in the third example, information common between layer k and layer k+1 is included in both the L1D signaling of layer k and the L1D signaling of layer k+1.

FIG. 58 is a diagram showing a third example (layer k) of the syntax of L1D signaling in the case of layer division multiplexing (LDM).

In the L1D signaling in FIG. 58, information unique to layer k is described in L1D_layer_id, L1D_plp_lls_flag, L1D_plp_mod, L1D_plp_cod, L1D_plp_TI_num_ti_blocks, and L1D_plp_TI_num_fec_blocks_max.

In addition, in the L1D signaling in Figure 58, L1D_version, L1D_ntp_time, L1B_eas_code, L1D_num_ofdm_symbols, L1D_bs_present, L1D_bs_null_cells, L1D_scattered_pilot_pattern, L1D_scattered_pilot_boost, and L1D_num_layers are described as common information between layer k and layer k+1. be done.

In this way, the L1D signaling in FIG. 58 describes information specific to layer k as well as information common to each layer, layer k and layer k+1.

FIG. 59 is a diagram showing a third example (layer k+1) of the syntax of L1D signaling in the case of layer division multiplexing (LDM).

In the L1D signaling in FIG. 59, information specific to layer k+1 is described in L1D_layer_id, L1D_plp_lls_flag, L1D_plp_mod, L1D_plp_cod, L1D_plp_TI_num_ti_blocks, and L1D_plp_TI_num_fec_blocks_max.

In addition, in the L1D signaling in Figure 59, L1D_version, L1D_ntp_time, L1B_eas_code, L1D_num_ofdm_symbols, L1D_bs_present, L1D_bs_null_cells, L1D_scattered_pilot_pattern, L1D_scattered_pilot_boost, and L1D_num_layers are described as common information between layer k and layer k+1. be done.

In this way, the L1D signaling in FIG. 59 describes information specific to the layer k+1 as well as information common to the layers k and k+1.

<Second solution method>

As mentioned above, when frequency division multiplexing (FDM) such as the current ISDB-T is adopted, L1 signaling such as TMCC information is distributed and arranged in the physical layer frame, so the receiving device 30 , there was a problem that one frame was always required to achieve synchronization, but this technology solves this problem by using the second solution method.

(Example of centralized signaling arrangement)
FIG. 60 is a diagram illustrating an example of centralized arrangement of L1 signaling in a physical layer frame to which the present technology is applied.

Note that in FIG. 60, FIG. 60B shows the structure of a physical layer frame to which the present technology is applied, and for comparison, FIG. 60A shows the structure of the physical layer frame of the current ISDB-T.

In FIG. 60A, the horizontal direction is a frequency axis representing subcarrier numbers (carrier numbers), and the vertical direction is a time axis representing OFDM symbol numbers (OFDM symbol numbers).

Here, ISDB-T defines three transmission modes, modes 1, 2, and 3, in which OFDM subcarrier intervals are different. Furthermore, ISDB-T defines four modulation methods for subcarriers: QPSK (Quaternary Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), 64QAM, and DQPSK (Differential QPSK).

FIG. 60A shows the configuration of an OFDM segment in which the transmission mode is mode 1 and the modulation methods are QPSK, 16QAM, and 64QAM. In FIG. 60A, one OFDM frame is composed of 204 OFDM symbols.

In FIG. 60A, Si,j represents a data symbol (carrier symbol) of a subcarrier modulated with upper layer data, and the OFDM segment includes a pilot signal SP (Scattered Pilot) and a TMCC signal in the data symbol. , each symbol (subcarrier) of an AC (Auxiliary Channel) signal is added.

The TMCC signal is a signal for transmitting TMCC information as signaling (control information), and the AC signal is an expansion signal for transmitting additional information regarding broadcasting. This AC signal can transmit AC information such as emergency alert information. That is, it can be said that TMCC information and AC information are L1 signaling.

Note that the configuration of the OFDM segment of the current ISDB-T is described in "3.12 Frame Configuration" of the above-mentioned Non-Patent Document 1.

As shown in FIG. 60A, in the current ISDB-T physical layer frame, L1 signaling such as TMCC information and AC information is arranged in the time direction and is configured in units of one physical layer frame. In other words, in the current ISDB-T physical layer frame, L1 signaling is distributed and arranged. Therefore, the receiving device 30 must process at least one physical layer frame before acquiring L1 signaling, and always requires the frame length (time) of one physical layer frame to achieve synchronization. Was.

On the other hand, a physical layer frame to which the present technology is applied has the configuration shown in FIG. 60B.

In FIG. 60B, the frequency division multiplexing method is shown when the direction from the left side to the right side in the figure is the direction of frequency (Freq), and the direction from the top side to the bottom side of the figure is the direction of time (Time). This shows the structure of a physical layer frame when (FDM) is used.

In FIG. 60B, a frame synchronization symbol (FSS) is inserted at the beginning of the physical layer frame, followed by a P1 symbol (P1).

Furthermore, when frequency division multiplexing (FDM) is used, a predetermined frequency band (for example, 6 MHz) is frequency-divided into multiple segments, and P2 symbols (P2), P2 symbols (P2), Data symbols and boundary symbols (BS) are arranged.

At this time, as shown in the frame of FIG. 60B, in one physical layer frame, a frame synchronization symbol (FSS), a P1 symbol (P1), and a P2 symbol (P2) are arranged in order from the beginning. . Here, the P1 symbol includes P1 signaling. Further, the P2 symbol includes P2 signaling such as L1B signaling and L1D signaling.

That is, L1 signaling included in the P1 symbol and P2 symbol is concentrated and arranged at the beginning of the physical layer frame. Therefore, when the receiving device 30 processes a physical layer frame, it is possible to quickly acquire the L1 signaling concentrated at the beginning of the frame and shorten the time required to establish synchronization.

Here, for example, it is possible to obtain L1 signaling in about half the time of the frame length of one physical layer frame, and as a result, it always takes the frame length of one physical layer frame. Compared to the current ISDB-T physical layer frame, which has been previously used, the time required to achieve synchronization can be reduced.

Note that the configuration of the physical layer frame in FIG. 60B corresponds to the configuration of the physical layer frame when frequency division multiplexing (FDM) is used in FIG. 8 described above. In addition, although frequency division multiplexing (FDM) has been described here, as shown in FIGS. 5, 6, and 9, physical layer frames when using time division multiplexing (TDM), Even in the physical layer frame when layer division multiplexing (LDM) is used, L1 signaling is concentrated at the beginning.

The second solution method has been explained above.

<Third solution method>

As mentioned above, with the current technology, the payload of a physical layer frame cannot be converted into FDM or LDM by applying frequency division multiplexing (FDM) or layer division multiplexing (LDM). Although it is possible, there was a problem that the frame synchronization symbol (FSS) and preamble (Preamble) could not be converted to FDM or LDM, but this technology solves this problem by using the third solution method. .

(Example of placement of FSS, P1, and P2 for FDM and LDM)
FIG. 61 is a diagram showing an example of arrangement of frame synchronization symbols (FSS), P1 symbols (P1), and P2 symbols (P2) in frequency division multiplexing (FDM) and layer division multiplexing (LDM). be.

In FIG. 61, FIG. 61A shows the physical layer frame configuration when frequency division multiplexing (FDM) is used, and FIG. 61B shows the physical layer frame configuration when layer division multiplexing (LDM) is used. The structure of the layer frame is shown.

In FIG. 61A, a frame synchronization symbol (FSS) is inserted at the beginning of the physical layer frame, followed by a P1 symbol (P1).

Furthermore, when using frequency division multiplexing (FDM), a predetermined frequency band (for example, 6 MHz) is divided into multiple segments, and each layer A and B (FDM layer) is divided into P2 symbols. (P2), a data symbol (Frame), and a boundary symbol (BS) are arranged.

At this time, as shown in the frame of FIG. 61A, the P2 symbol is arranged for each layer, layer A and layer B, by dividing the data placed there. Therefore, in the physical layer frame shown in FIG. 61A, not only data symbols and boundary symbols but also preambles such as P2 symbols can be converted into FDM.

On the other hand, in FIG. 61B, a frame synchronization symbol (FSS) is inserted at the beginning of the physical layer frame, followed by a P1 symbol (P1).

Furthermore, when layer division multiplexing (LDM) is used, P2 symbols (P2), data symbols (Frame), and boundary symbols (BS) are arranged for each layer (LDM layer) with different transmission power. Ru.

At this time, as shown in the frame of FIG. 61B, the P2 symbols are arranged for each layer (LDM layer) of layer k and layer k+1. Therefore, in the physical layer frame shown in FIG. 61B, not only data symbols and boundary symbols but also preambles such as P2 symbols can be converted into LDM.

In this way, in the third solution method, when frequency division multiplexing (FDM) or layer division multiplexing (LDM) is used, not only data symbols and boundary symbols but also preambles such as P2 symbols are or LDM.

Note that the configuration of the physical layer frame in FIG. 61A corresponds to the configuration of the physical layer frame in the case of frequency division multiplexing (FDM) in FIG. 7 described above, and the configuration of the physical layer frame in FIG. This corresponds to the structure of the physical layer frame in the case of Layer Division Multiplexing (LDM) of No. 9.

The third solution method has been explained above.

<Operation of receiving device>

Next, the operation of the receiving device 30 in FIG. 1 will be described with reference to FIGS. 62 to 66.

(1) Time division multiplexing (TDM) physical layer frame processing

(Frame processing example)
FIG. 62 is a diagram illustrating processing on the receiving side for physical layer frames in the case of time division multiplexing (TDM).

As shown in Figure 62, when using time division multiplexing (TDM), a frame synchronization symbol (FSS), P1 symbol (P1), and P2 symbol (P2) are arranged in order from the beginning of the physical layer frame. Ru. In the example of FIG. 62, the physical layer frame corresponds to a subframe, so two subframes, subframe n and subframe n+1, are arranged following the P2 symbol (P2). There is.

Here, the receiving device 30 can recognize the beginning of the physical layer frame using the frame synchronization symbol (FSS) and acquire information on the P1 symbol (P1 signaling). Further, the receiving device 30 can extract P2 symbol information (P2 signaling) from the physical layer frame using the P1 signaling information, and further extract data symbols.

Further, when two or more subframes are arranged, modulation parameters can be changed for each subframe, and L1D signaling includes information on modulation parameters for each subframe. Therefore, the receiving device 30 can extract data symbols of each subframe from the physical layer frame using L1D signaling information (for example, information in the L1D signaling subframe loop in FIG. 48).

Note that the receiving device 30 can also selectively extract data symbols of subframe n within the frame of FIG. 62 from the physical layer frame using L1D signaling information.

(2) Frequency division multiplexing (FDM) physical layer frame processing

(Frame processing example)
FIG. 63 is a diagram illustrating processing on the receiving side for physical layer frames in the case of frequency division multiplexing (FDM).

As shown in FIG. 63, when frequency division multiplexing (FDM) is used, a frame synchronization symbol (FSS) and a P1 symbol (P1) are arranged in order from the beginning of the physical layer frame, and furthermore, layer A and layer B A P2 symbol (P2), a data symbol (Frame), and a boundary symbol (BS) are arranged for each layer (FDM layer).

Here, when the receiving device 30 receives the entire band of a predetermined frequency band (for example, 6 MHz) assigned to the channel, it recognizes the beginning of the physical layer frame by the frame synchronization symbol (FSS), and the information of the P1 symbol ( P1 signaling). Further, the receiving device 30 can extract P2 symbol information (P2 signaling) from the physical layer frame using the P1 signaling information, and further extract data symbols.

Furthermore, when the receiving device 30 receives a partial band corresponding to layer A of the predetermined frequency band, it receives the frequency band within the frame of FIG. 63. Here, FIG. 64 shows details of the configuration of the physical layer frame of FIG. 63. That is, in FIG. 64, the P2 symbol, data symbol, and boundary symbol for each layer of layer A and layer B are represented in units of segments.

In FIG. 64, each layer, layer A and layer B, is composed of a plurality of segments, but for example, the total number of segments is 35 segments, and layer A including the center segment has 9 segments in the center. be able to. In other words, when the receiving device 30 receives the partial band corresponding to layer A, it receives only the frequency band for the central nine segments.

In this case, the receiving device 30 can recognize the beginning of the physical layer frame using a sufficiently robust frame synchronization symbol (FSS) and can acquire information on the P1 symbol (P1 signaling). Furthermore, the receiving device 30 can recognize the number of segments in layer A (for example, 9 segments) from the P1 signaling information (for example, P1_P2_waveform_structure in FIG. 31).

Therefore, the receiving device 30 uses P1 signaling information to extract P2 symbol information (P2 signaling) from the partial band corresponding to layer A consisting of nine central segments, and further extracts data symbols. I can do it.

Note that, for example, in FIG. 65, when the total number of segments is 35, even when the middle 7 segments are set to layer A, the receiving device 30 partially divides the frequency band for the middle 9 segments. By receiving as a band, it is possible to extract P2 signaling and further extract data symbols using information on P1 signaling.

(3) Processing of physical layer frames of layered division multiplexing (LDM)

(Frame processing example)
FIG. 66 is a diagram illustrating processing on the receiving side for physical layer frames in the case of layer division multiplexing (LDM).

As shown in FIG. 66, when layer division multiplexing (LDM) is used, a frame synchronization symbol (FSS) and a P1 symbol (P1) are arranged in order from the beginning of the physical layer frame, and then a P2 symbol (P2) , a data symbol (Frame), and a boundary symbol (BS) are arranged in this order. However, the P2 symbol (P2), data symbol (Frame), and boundary symbol (BS) are arranged for each layer (LDM layer) of layer k and layer k+1.

Here, the receiving device 30 can recognize the beginning of the physical layer frame using the frame synchronization symbol (FSS) and acquire information on the P1 symbol (P1 signaling). In addition, the receiving device 30 can use the P1 signaling information to extract P2 symbol information (P2 signaling) for each layer of layer k and layer k+1, and further extract data symbols.

Note that the receiving device 30 can also selectively extract a part of the layer (LDM layer) within the frame in FIG. 66 from the physical layer frame using L1 signaling information.

<Processing flow corresponding to each solution method>

Next, with reference to the flowcharts of FIGS. 67 to 71, a description will be given of the flow of processing on the transmitting side and the receiving side corresponding to the first to third solving techniques described above.

(Processing corresponding to the first solution method)
First, with reference to the flowcharts of FIGS. 67 and 68, the flow of processing on the transmitting side and receiving side corresponding to the first solution method will be described. However, as described above, there are two methods for the first solution: a synchronization pattern solution method that uses different synchronization patterns, and a P1 signaling solution method that uses P1 signaling, so these will be explained in order.

(Processing corresponding to synchronous pattern solving method)
The flow of processing on the transmitting side and receiving side corresponding to the synchronization pattern solving method will be described with reference to the flowchart in FIG. 67.

In step S11, the component processing unit 111 to data processing unit 114 of the data processing device 10 generate a stream.

In the process of step S11, the multiplexer 13 multiplexes the component stream from the component processing section 111 and the upper layer signaling stream from the signaling generation section 112. Then, the data processing unit 114 processes the stream obtained as a result of multiplexing to generate a transmission data stream.

In step S12, the data processing unit 211 of the transmitting device 20 generates a physical layer frame by processing the stream obtained in the process of step S11.

In the process of step S12, by using the synchronization pattern solving method described above, a common frame synchronization symbol (FSS) is used for each multiplexing method (FDM, TDM, LDM) using a different synchronization pattern (for example, the synchronization pattern in FIG. ), a physical layer frame is generated.

In step S13, the modulation unit 212 of the transmitting device 20 performs necessary processing on the physical layer frame obtained in the processing of step S12, and transmits the resulting broadcast signal to the transmitting antenna installed at the transmitting station. Send from.

In step S21, the RF section 311 of the receiving device 30 receives a broadcast signal transmitted from a transmitting antenna installed at a transmitting station.

In step S22, the demodulator 312 of the receiving device 30 processes the physical layer frame obtained from the broadcast signal received in the process of step S21.

In the process of step S22, the synchronization pattern solving method described above is used to determine the multiplexing method (FDM, TDM, A stream of transmission data is obtained by determining the physical layer frame (LDM) and processing the physical layer frame according to the determination result.

In step S23, the data processing unit 313 of the receiving device 30 processes the stream obtained in the process of step S22.

In the process of step S23, upper layer signaling and component streams are obtained by processing the transmission data stream. Then, by processing the upper layer signaling and component streams, content such as a broadcast program is played back.

The process flow corresponding to the synchronization pattern solving method has been described above.

(Processing corresponding to P1 signaling solution method)
The flow of processing on the transmitting side and receiving side corresponding to the P1 signaling solution method will be described with reference to the flowchart in FIG. 68.

Note that in FIG. 68, the processing in steps S31 and S33 on the sending side and the processing in steps S41 and S43 on the receiving side are the same as the processing in steps S11 and S13 in FIG. 67 and the processing in steps S21 and S23 in FIG. Since it is the same as that, its explanation will be omitted.

In step S32 on the transmitting side, the data processing unit 211 of the transmitting device 20 generates a physical layer frame by processing the stream obtained in step S31.

In the process of step S32, the P1 signaling method that describes the discrimination information (for example, P1_Frame_Multiplexing in FIGS. 37, 39, and 41) for discriminating the multiplexing method (FDM, TDM, LDM) is performed using the P1 signaling solution method described above. A physical layer frame is generated that includes: However, this physical frame has a common frame synchronization symbol (FSS) and the same synchronization pattern.

On the other hand, in step S42 on the receiving side, the demodulator 312 of the receiving device 30 processes the physical layer frame obtained from the broadcast signal received in the process of step S41.

In the process of step S42, the multiplexing method (FDM, TDM, A stream of transmission data is obtained by determining the physical layer frame (LDM) and processing the physical layer frame according to the determination result.

The process flow corresponding to the P1 signaling solution method has been explained above.

(Processing corresponding to the second solution method)
Next, with reference to the flowchart of FIG. 69, the flow of processing on the transmitting side and receiving side corresponding to the second solution method will be described.

In step S51, a stream is generated by the component processing unit 111 to data processing unit 114 of the data processing device 10, similar to the process in step S11 of FIG.

In step S52, the data processing unit 211 of the transmitting device 20 generates a physical layer frame by processing the stream obtained in the process of step S51.

In the process of step S52, the physical layer frame (for example, in FIG. 60B physical layer frame) is generated.

In step S53, the broadcast signal is transmitted by the modulation section 212 of the transmitting device 20, similar to the process in step S13 of FIG. In step S61, the broadcast signal is received by the RF section 311 of the receiving device 30, similar to step S21 in FIG.

In step S62, the demodulator 312 of the receiving device 30 processes the physical layer frame obtained from the broadcast signal received in the process of step S61.

In the process of step S62, the L1 signaling that is concentrated at the beginning (leading side) of the physical layer frame (for example, the physical layer frame in FIG. 60B) is obtained by the second solution method described above, and Processing the layer frames results in a stream of transmitted data.

In step S63, the stream is processed by the data processing unit 313 of the receiving device 30, similar to step S23 in FIG.

The flow of processing corresponding to the second solution method has been described above.

(Processing corresponding to the third solution method)
Finally, with reference to the flowcharts of FIGS. 70 and 71, the flow of processing on the transmitting side and receiving side corresponding to the third solution method described above will be described. However, as mentioned above, there are two solutions for the third solution: one for frequency division multiplexing (FDM) and one for layer division multiplexing (LDM). explain.

(FDM compatible processing)
With reference to the flowchart of FIG. 70, the flow of processing on the transmitting side and receiving side corresponding to the third solution method compatible with FDM will be described.

In step S71, a stream is generated by the component processing unit 111 to data processing unit 114 of the data processing device 10, similar to the process in step S11 of FIG.

In step S72, the data processing unit 211 of the transmitting device 20 generates a physical layer frame by processing the stream obtained in step S71.

In the process of step S72, by arranging P2 symbols (P2 signaling) for each layer (FDM layer) of layer A and layer B using the third solution method for FDM described above, FDM is performed. A physical layer frame (eg, the physical layer frame of FIG. 61A) is generated.

In step S73, the broadcast signal is transmitted by the modulation section 212 of the transmitting device 20, similar to the process in step S13 of FIG. In step S81, the broadcast signal is received by the RF section 311 of the receiving device 30, similar to step S21 in FIG.

In step S82, the demodulator 312 of the receiving device 30 processes the physical layer frame obtained from the broadcast signal received in the process of step S81.

In the process of step S82, P2 signaling (L1B signaling or L1D signaling) is converted from the P2 symbol converted into FDM in the physical layer frame (for example, the physical layer frame in FIG. 61A) by the third solution method compatible with FDM described above. By acquiring the physical layer frame and processing the physical layer frame, a stream of transmission data is obtained.

In step S83, the stream is processed by the data processing unit 313 of the receiving device 30, similar to step S23 in FIG.

The process flow corresponding to the third solution method compatible with FDM has been described above.

(LDM compatible processing)
With reference to the flowchart of FIG. 71, the flow of processing on the transmitting side and receiving side corresponding to the third solution method compatible with LDM will be described.

In FIG. 71, the processing in steps S91 and S93 on the sending side and the processing in steps S101 and S103 on the receiving side are the same as the processing in steps S71 and S73 in FIG. 70 and the processing in steps S81 and S83 in FIG. Since it is the same as that, its explanation will be omitted.

In step S92 on the transmitting side, the data processing unit 211 of the transmitting device 20 generates a physical layer frame by processing the stream obtained in step S91.

In the process of step S92, the P2 symbols (P2 signaling) are arranged for each layer (LDM layer) of layer k and layer k+1 and converted into LDM using the third LDM-compatible solution method described above. Then, a physical layer frame (eg, the physical layer frame of FIG. 61B) is generated.

On the other hand, in step S102 on the receiving side, the demodulator 312 of the receiving device 30 processes the physical layer frame obtained from the broadcast signal received in the process of step S101.

In the process of step S102, P2 signaling (L1B signaling or L1D signaling) is converted from the P2 symbol converted into LDM in the physical layer frame (for example, the physical layer frame in FIG. 61B) by the third LDM-compatible solution method described above. By acquiring the physical layer frame and processing the physical layer frame, a stream of transmission data is obtained.

The process flow corresponding to the third solution method compatible with LDM has been described above.

<Modified example>

(Combination of solution methods)
In the above explanation, each of the first to third solution methods has been explained separately, but two or more solution methods can also be combined.

For example, by combining the first solution method and the second solution method, when using the same synchronization pattern with a common frame synchronization symbol (FSS) in the physical layer frame, L1 signaling is concentrated at the beginning of the frame synchronization symbol (FSS). It is also possible to arrange the This allows the receiving device 30 to not only determine the multiplexing method when processing a physical layer frame, but also to shorten the time required to establish synchronization.

For example, by combining the first solution method and the third solution method, it is possible to include discrimination information for discriminating the multiplexing method as PI signaling information in the physical layer frame, and to include discrimination information for discriminating the multiplexing method in the physical layer frame. It is also possible to arrange P2 symbols for each layer (or LDM layer). This allows the receiving device 30 to not only determine the multiplexing method when processing a physical layer frame, but also to convert the preamble of the physical layer frame into FDM or LDM.

(Other multiplexing methods)
Additionally, in the above explanation, three multiplexing methods were illustrated as frequency division multiplexing (FDM), time division multiplexing (TDM), and layer division multiplexing (LDM). However, other multiplexing methods may be included, such as a layered time division multiplexing method (LDM_TDM) and a layered frequency division multiplexing method (LDM_FDM). In addition, the multiplexing method is not limited to the three multiplexing methods of frequency division multiplexing (FDM), time division multiplexing (TDM), and layer division multiplexing (LDM), but also two or more multiplexing methods. Any method may be used as long as it is a method of conversion.

(Application to other broadcasting systems)
The above explanation focused on ISDB (Integrated Services Digital Broadcasting), which is the method adopted in Japan and other countries as a standard for digital television broadcasting, but this technology is based on ATSC, which is the method adopted in the United States and other countries. (Advanced Television Systems Committee) or DVB (Digital Video Broadcasting), which is a method adopted by European countries.

In other words, even in the current ATSC and DVB, there is no specified method for realizing multiple multiplexing methods (e.g., FDM, TDM, LDM, etc.) using the same broadcasting system, and this technology cannot be applied. This allows for more flexible operation when implementing multiple multiplexing methods in the same broadcasting system. Further, the above-mentioned layer (FDM layer) can also be conceptually understood as a PLP (Physical Layer Pipe). In this case, the multiple layers can also be said to be M-PLP (Multiple-PLP).

In addition to terrestrial broadcasting, digital television broadcasting standards also apply to satellite broadcasting using broadcasting satellites (BS) and communication satellites (CS), and wired broadcasting such as cable television (CATV). can do.

(other examples of packets and signaling)
Further, the names of packets, frames, signaling (control information), etc. described above are just examples, and other names may be used. However, the difference in these names is a formal difference, and does not mean that the actual contents of the target packet, frame, signaling, etc. are different.

In addition, this technology is based on a predetermined standard that is defined assuming that a transmission path other than a broadcast network, for example, a communication line (communication network) such as the Internet or a telephone network, is used as a transmission path. It can also be applied to standards other than digital broadcasting standards). In that case, a communication line such as the Internet is used as the transmission path of the transmission system 1 (FIG. 1), and the functions of the data processing device 10 and the transmission device 20 are provided by a communication server provided on the Internet. . Then, the communication server and the receiving device 30 perform two-way communication via the communication line.

<Time division multiplexing (TDM) physical layer frame with subframes converted to FDM>

A time division multiplexing (TDM) physical layer frame in which subframes are FDM (layered) will be described below.

A time division multiplexing (TDM) physical layer frame in which subframes are FDMed, which will be described below, can be applied to the transmission system 1 of FIG. 1 by using, for example, a synchronization pattern solving method. Furthermore, a time division multiplexing (TDM) physical layer frame in which subframes are FDM-based can be applied to any other transmission system other than the transmission system 1.

FIG. 72 is a diagram illustrating an overview of a configuration example of a physical layer frame of time division multiplexing (TDM).

Hereinafter, a physical layer frame (in case of time division multiplexing) (TDM) is also referred to as a TDM frame.

In FIG. 72, the horizontal direction represents the frequency direction, and the vertical direction represents the time direction. The same applies to the following diagrams showing TDM frames (including FDM-converted TDM frames described later).

In FIG. 72, the TDM frame includes, in time order from the beginning, an FSS of 1 (OFDM) symbol, a P1 symbol of 1 or more M symbols, a P2 symbol of 1 or more K symbols, and 1 or more N subframes. It is configured by placing #1 to #N. N subframes #1 to #N are composed of L symbols.

A BS (boundary symbol) can be placed in one or both of the first and last (OFDM) symbol of a subframe (in the time direction). In FIG. 72, BSs are placed at the beginning and end of the last subframe #N.

FIG. 73 is a diagram illustrating an overview of a configuration example of a TDM frame in which subframes are converted into FDM.

In the following, in order to simplify the explanation, it is assumed that a TDM frame includes one subframe.

Further, it is assumed that the TDM frame includes two (OFDM) P1 symbols and one P2 symbol.

Regarding the two P1 symbols, the first P1 symbol and P1 signaling in time order are also referred to as the P1-1 symbol and P1-1 signaling, respectively. Further, the second P1 symbol and P1 signaling are also referred to as P1-2 symbol and P1-2 signaling, respectively.

In a TDM frame in which subframes are FDMed, subframes hierarchized in the frequency direction are arranged in the TDM frame. When a TDM frame includes multiple subframes, when subframes are converted to FDM, a (different) number of layers can be set for each subframe.

In subframe FDM, a channel transmission band (for example, a frequency band such as 6MHz) is frequency-divided into a plurality of segments. A hierarchy is constructed by grouping one or more segments. For example, the transmission band can be frequency-divided into 33 or 35 segments, with the central 9 segments forming layer A, and the remaining 24 or 26 segments on the left and right forming layer B.

That is, for example, a subframe is divided into 35 segments in the frequency direction, the central 9 segments constitute a subframe of layer A, and the remaining 26 segments on the left and right constitute a subframe of layer B.

Hereinafter, a TDM frame in which at least a subframe is FDM-ized is also referred to as an FDM-ized TDM frame.

In addition, in the following, in the FDM TDM frame, for example, the transmission band is frequency divided into 35 segments, the central 9 segments constitute layer A, and the remaining 26 segments on the left and right constitute layer B. That's it.

According to the FDM TDM frame, at least the subframes are FDM-coded, so as in the case of frequency division multiplexing (FDM) explained in FIG. ), a partial reception service that transmits (transmits) broadcasting service data in the frequency band of layer A (partial band corresponding to layer A) and receives only (the signal of) the frequency band of layer A. can be provided.

The frequency band of layer A can be said to be a frequency band (partial band) that provides a partial reception service out of the channel transmission band.

FIG. 74 is a diagram illustrating an outline of another configuration example of an FDM-converted TDM frame.

In FIG. 74, in addition to the subframes, the P2 symbol is also FDMized.

When the FDM TDM frame includes one subframe, the FDM TDM frame in which the subframe and P2 symbol are FDM-ized is the same as the frequency division multiplexing (FDM) physical layer frame shown in Figure 7. They are configured almost the same way.

FIG. 75 is a diagram showing details of another example of the configuration of the FDM-converted TDM frame.

In FIG. 75, P2 and D surrounded by a rectangle represent a P2 symbol (subcarrier) in units of segments in the frequency direction and units in symbol length in the time direction, and a data symbol (subcarrier) of a subframe, respectively.

The transmitting device 20 can generate and transmit the TDM frames (including FDM-converted TDM frames) described in FIGS. 72 to 75.

<Configuration example of transmitting device 20 and receiving device 30 when handling TDM frames>

FIG. 76 is a block diagram showing a configuration example of the transmitting device 20 and the receiving device 30 when handling TDM frames (including FDM-converted TDM frames).

In addition, in the figure, parts corresponding to those in FIGS. 2 and 3 are denoted by the same reference numerals, and the description thereof will be omitted below as appropriate.

In FIG. 76, transmitting device 20 includes a data processing section 221 and a modulation section 212.

Therefore, the transmitting device 20 in FIG. 76 is similar to the case in FIG. 2 in that it includes a modulation section 212, and differs from the case in FIG. 2 in that it includes a data processing section 221 in place of the data processing section 211. .

The data processing unit 221 receives and processes transmission data transmitted from the data processing device 10 via the communication line 40, and generates packets (frames) in a predetermined format and physical layer signaling. Extract information.

The data processing unit 221 generates a TDM frame by processing packets (frames) in a predetermined format and physical layer signaling information, and supplies the TDM frame to the modulation unit 212 .

In FIG. 76, the receiving device 30 includes an RF section 311, a demodulating section 332, and a data processing section 313.

Therefore, the receiving device 30 in FIG. 76 is the same as the case in FIG. 3 in that it includes an RF section 311 and a data processing section 313, and the receiving device 30 in FIG. It differs from

The demodulation section 332 is composed of, for example, a demodulation LSI. The demodulation section 332 performs demodulation processing on the signal supplied from the RF section 311. In demodulation processing, for example, TDM frames are processed in accordance with physical layer signaling to obtain packets in a predetermined format. The packet obtained by the demodulation process is supplied to the data processing section 313.

The transmitting device 20 can generate and transmit a TDM frame, such as the FDM-modified TDM frame shown in FIG. 75. The receiving device 30 can receive (the broadcast signal of) the FDM-converted TDM frame from the transmitting device 20 and process it.

In FIG. 76, the receiving device 30 is an all-band reception (fixed reception) that receives (signals of) the entire transmission band (for example, a frequency band such as 6 MHz) of the channel on which the FDM-converted TDM frame is transmitted (transmitted). , and partial reception (narrowband reception) of receiving the frequency band of layer A, which is a narrow band of a part of the transmission band.

<Processing of FDM TDM frame>

FIG. 77 is a diagram illustrating processing of an FDM-converted TDM frame by the receiving device 30.

FIG. 77 shows an FDM-converted TDM frame.

In full-band reception, the receiving device 30 receives signals in all the transmission bands of the channel, that is, signals in the frequency bands of layers A and B, and detects the FSS from the signals in all the bands. The receiving device 30 recognizes the beginning of the FDM-converted TDM frame using the FSS, and acquires P1 signaling from the entire P1 symbol immediately after the FSS. The receiving device 30 extracts P2 signaling from the entire P2 symbol using P1 signaling, and extracts (the data symbol of) a subframe using P2 signaling.

In partial reception, the receiving device 30 receives a signal in the frequency band (narrow band) of layer A surrounded by a thick frame in the figure in the transmission band of the channel, that is, a signal in the center 9 segments out of 35 segments. Then, the FSS is detected from the layer A frequency band signal. The receiving device 30 recognizes the beginning of the FDM-converted TDM frame using the FSS, and acquires P1 signaling from the layer A portion (signal in the layer A frequency band) of the P1 symbol immediately after the FSS. The receiving device 30 extracts P2 signaling from the layer A portion of the P2 symbol using P1 signaling, and extracts the layer A portion of (the data symbol of) the subframe using P2 signaling. P2 signaling extracted from the layer A portion of the P2 symbol includes information necessary for partial reception.

In partial reception, only a portion of the FSS and P1 symbols transmitted over the entire transmission band of the channel, that is, the layer A portion is received, and the layer B portion is not received.

Therefore, in partial reception using FDM-converted TDM frames, reception performance, for example, required CNR (carrier to noise ratio), may deteriorate more than in full-band reception.

Therefore, in this technology, the deterioration of the reception performance of partial reception using FDM TDM frames is suppressed by one or a combination of the first to fifth suppression methods for suppressing the deterioration of the reception performance. do.

Here, in the first to fifth suppression methods, first to fifth FDM-converted TDM frames, which will be described later, are used, respectively. In contrast to the first to fifth FDM TDM frames, the FDM TDM frame shown in FIG. 77 is also referred to as a normal FDM TDM frame.

<First suppression method>

FIG. 78 is a diagram illustrating the first suppression method.

FIG. 78 shows an example of the structure of the first FDM TDM frame used in the first suppression method.

In the first suppression method, when providing a partial reception service using an FDM TDM frame, the frequency band of the FSS and P1 symbol of the FDM TDM frame is narrowed, similar to the ATSC3.0 bootstrap. , as shown in FIG. 78, is a frequency band within the frequency band (partial band) of layer A that provides partial reception service.

The FFT size of the FSS and P1 symbol (hereinafter also referred to as narrowband FSS and P1 symbol) whose frequency band is narrowed within the frequency band of layer A is, for example, 1/2 of that in the case of full-band reception. It can be done.

In this case, when the FFT size of the FSS and P1 symbol in the case of full-band reception is, for example, 1024 (1K) as explained in FIG. 22, the FFT size of the narrowband FSS and P1 symbol is 512. Become.

For example, if the sampling frequency Fs is 3.16049MHz, the symbol length Tu of the narrowband FSS and P1 symbol is Tu=1/Fs×FFT size=1/3.16049MHz×512=161.996 μsec (microseconds).

In this case, the carrier interval of the subcarriers of the narrowband FSS and P1 symbol is 1/161.996 μsec=6.172 kHz.

For example, in the IFFT of the narrowband FSS and P1 symbol, of the 512 points of the FFT size, only the center 242 points are assigned to the narrowband FSS and P1 symbol, and 0 is assigned to the remaining 270 points on the left and right. do. In this case, the bandwidth occupied by the narrowband FSS and P1 symbol is 6.172kHz×242=1.49MHz.

As the narrowband P1 symbol, a P1 symbol required for both full-band reception and partial reception is adopted.

Thereby, the receiving device 30 can process the FDM TDM frame by receiving the narrowband P1 symbol in either full band reception or partial reception.

In the first FDM TDM frame used in the first suppression method in FIG. 78, the frequency bands of the FSS and P1 symbols are narrowed to the frequency band within the frequency band of layer A. Compared to a case where the frequency bands of the FSS and P1 symbols are not narrowed like in a normal FDM-based TDM frame, the amount of information that can be transmitted with the FSS and P1 symbols is reduced. Furthermore, it becomes difficult to achieve synchronization, and the frequency offset that can be handled becomes small.

However, on the other hand, in the first FDM TDM frame used in the first suppression method, the required CNR for partial reception is improved compared to the case of the normal FDM TDM frame in FIG. It is possible to suppress deterioration in reception performance of the partial reception used.

Note that here, the frequency band of only the FSS and P1 symbol of the FDM TDM frame is narrowed, but the frequency band of the P2 symbol is also narrowed in the same way as the P1 symbol, and the frequency band is narrowed. The resulting narrowband P2 symbols can be placed in the FDM TDM frame.

<Second suppression method>

FIG. 79 is a diagram illustrating the second suppression method.

FIG. 79 shows a configuration example of the second FDM-modified TDM frame used in the second suppression method.

In the second suppression method, when providing a partial reception service using an FDM TDM frame, the frequency band of the FSS and P1 symbol of the FDM TDM frame is set as shown in FIG. The frequency band is divided into a frequency band (partial band) of layer A and a frequency band of a layer other than layer A, here, layer B (band narrowing).

In FIG. 79, the frequency bands of the FSS and P1 symbols of the FDM TDM frame are divided into a frequency band of layer A, a frequency band of layer B on the left, and a frequency band of layer B on the right.

The FFT size of the FSS and P1 symbol (hereinafter also referred to as divided FSS and P1 symbol) divided into the frequency band of layer A, the frequency band of layer B on the left, and the frequency band of layer B on the right is, for example, the frequency The bandwidth can be reduced to 1/2 of that when the band is not divided.

In this case, if the FFT size of the FSS and P1 symbols when the frequency band is not divided is, for example, 1024 (1K) as explained in FIG. 22, the FFT size of the divided FSS and P1 symbols will be 512. .

For example, the divided P1 symbols of the frequency band of layer A, the frequency band of layer B on the left, and the frequency band of layer B on the right are the same (information) necessary for both full-band reception and partial reception. P1 symbol can be adopted.

In addition, for example, the P1 symbol (P1 signaling) necessary for partial reception is adopted as the divided P1 symbol of the frequency band of layer A, and the frequency band of layer B on the left side and the frequency band of layer B on the right side are divided. As each P1 symbol, the P1 symbol required for full-band reception can be adopted.

In any case, in partial reception, the receiving device 30 can process the FDM TDM frame by receiving the divided P1 symbols of the layer A frequency band.

In the second FDM TDM frame used in the second suppression method in FIG. 79, the frequency bands of the FSS and P1 symbols are divided into multiple frequency bands including the layer A frequency band. Compared to a case where the frequency bands of FSS and P1 symbols are not divided like in a normal FDM TDM frame, there is a possibility that the processing for receiving all bands becomes more complicated.

However, on the other hand, in the second FDM TDM frame used in the second suppression method, the required CNR for partial reception is improved compared to the case of the normal FDM TDM frame in FIG. It is possible to suppress deterioration in reception performance of the partial reception used. Furthermore, regarding full-band reception, it is possible to maintain the same information transmission and other performance as in the case of the normal FDM-converted TDM frame shown in FIG. 77.

Note that in the FDM TDM frame, the frequency band of the P2 symbol can also be divided in the same way as the P1 symbol, and the divided P2 symbols whose frequency band has been divided can be arranged in the FDM TDM frame.

<Third suppression method>

FIG. 80 is a diagram illustrating the third suppression method.

FIG. 80 shows an example of the configuration of the third FDM TDM frame used in the third suppression method.

In the third suppression method, when providing a partial reception service using an FDM TDM frame, the frequency band of the FSS and P1 symbol of the FDM TDM frame is partially The frequency band is narrowed to a frequency band within the frequency band (subband) of layer A that provides reception services, and the narrowband FSS and P1 symbol and the FSS and P1 symbol before narrowband (hereinafter referred to as full band FSS and P1 symbol) are used. ) are arranged in the time direction of the FDM-converted TDM frame, as shown in FIG.

In FIG. 80, the narrowband FSS is placed at the beginning of the FDM TDM frame, and then the full-band FSS, the P1-1 symbol of the narrowband P1 symbols, and the P1-1 symbol of the full-band P1 symbols. , P1-2 symbols among the narrowband P1 symbols, and P1-2 symbols among the full-band P1 symbols are arranged in that order.

Note that the arrangement order of the narrow band FSS and P1 symbol and the full band FSS and P1 symbol is not limited to this. For example, narrowband FSS and P1 symbols can be placed at the beginning, followed by full band FSS and P1 symbols. Also, for example, the narrowband FSS and the full-band FSS are arranged in that order, and then the P1-1 symbol and the P1-2 symbol of the narrowband P1 symbol and the P1-1 symbol and the full-band P1 symbol are arranged. P1-2 symbols can be placed in that order.

The FFT size of the full-band FSS and P1 symbol can be, for example, 1024 (1K) as explained in FIG. 22. The FFT size of the narrowband FSS and P1 symbol can be set to, for example, 1/2 of that in the case of full-band reception, for example, 512 here, similarly to the first suppression method.

In the third suppression method, the P1 symbol necessary for both partial reception and full-band reception can be adopted as the narrowband P1 symbol, as in the first suppression method, and the P1 symbol necessary for partial reception can be adopted as the narrowband P1 symbol. It is also possible to adopt only the P1 symbol.

In partial reception, the receiving device 30 can process the FDM TDM frame by receiving the narrowband FSS and P1 symbol. Furthermore, in full-band reception, the receiving device 30 can process the FDM-converted TDM frame by receiving the full-band FSS and P1 symbol.

In the third FDM TDM frame used in the third suppression method in FIG. 80, narrowband FSS and P1 symbols and full band FSS and P1 symbols are arranged, so the normal FDM TDM frame in FIG. Although full-band FSS and P1 symbols are arranged like a frame, it takes more time to transmit the FSS and P1 symbols than when narrow-band FSS and P1 symbols are not arranged.

However, on the other hand, in the third FDM TDM frame used in the third suppression method, the required CNR for partial reception is improved compared to the case of the normal FDM TDM frame in FIG. It is possible to suppress deterioration in reception performance of the partial reception used.

Furthermore, in full-band reception, by receiving full-band FSS and P1 symbols, only the narrowband FSS and P1 symbols that occur in the first suppression method are affected by being arranged as FSS and P1 symbols. For example, it is possible to avoid a reduction in the amount of information that can be transmitted by FSS and P1 symbols, difficulty in achieving synchronization, and a reduction in the frequency offset that can be accommodated.

Note that here, the frequency band of only the FSS and P1 symbol of the FDM TDM frame is narrowed, but the frequency band of the P2 symbol is also narrowed in the same way as the P1 symbol, and the frequency band is narrowed. The narrowband P2 symbol that has been narrowed and the full-band P2 symbol that is the P2 symbol before narrowband can be arranged in the time direction of the FDM TDM frame.

<Fourth suppression method>

FIG. 81 is a diagram illustrating the fourth suppression method.

FIG. 81 shows a configuration example of the fourth FDM-based TDM frame used in the fourth suppression method.

In the fourth suppression method, when providing a partial reception service using an FDM TDM frame, the FSS and P1 symbol frequency bands of the FDM TDM frame are , the (transmission) power of the FSS and P1 symbol of the frequency band (partial band) of layer A that provides partial reception service is boosted to be larger than the power of other frequency bands.

The receiving device 30 can perform partial reception and full-band reception in the same manner as in the case of the normal FDM-converted TDM frame shown in FIG.

In the fourth FDM TDM frame used in the fourth suppression method in FIG. 81, the power of the FSS and P1 symbol of the frequency band of layer A is boosted, so the power of the FSS and P1 symbol of the frequency band of layer A is boosted, so the power of the FSS and P1 symbol of the frequency band of layer A is boosted. The required CNR for partial reception is improved compared to a normal FDM TDM frame, and it is possible to suppress deterioration of reception performance in partial reception using an FDM TDM frame. However, the degree of improvement in the required CNR with the fourth suppression method may be inferior to the degree of improvement in the required CNR with the first suppression method, depending on the degree of boost.

Furthermore, according to the fourth FDM TDM frame used in the fourth suppression method, in full-band reception, the same amount of information can be transmitted as in the case of the normal FDM TDM frame shown in FIG. Synchronization and other performance can be maintained.

Note that here, only the FSS and P1 symbols of the FDM-converted TDM frame are boosted, but the P2 symbols can also be boosted in the same way as the FSS and P1 symbols.

<Fifth suppression method>

FIG. 82 is a diagram illustrating the fifth suppression method.

FIG. 82 shows a configuration example of the fifth FDM-based TDM frame used in the fifth suppression method.

In the fifth suppression method, when providing a partial reception service using an FDM TDM frame, the information bits of the FSS and P1 symbol of the FDM TDM frame are The FSS and P1 symbols are configured so that the frame has more redundancy than in the case of a TDM frame that is not converted into FDM.

For example, in a TDM frame in which the subframe is not FDM, if the FFT size of the FSS and P1 symbol is 1K and 10 bits of signaling is possible per 1 (OFDM) symbol, in the fifth FDM TDM frame, , By configuring the FSS and P1 symbols so that each (OFDM) symbol carries out 5-bit signaling, for example, 1/2 of a TDM frame in which the subframe is not FDM, redundancy can be provided. I can do it.

Furthermore, for example, redundancy can be provided by configuring the FSS and P1 symbols so that the same information is transmitted multiple times, such as twice.

The receiving device 30 can perform partial reception and full-band reception in the same manner as in the case of the normal FDM-converted TDM frame shown in FIG.

In the fifth FDM TDM frame used in the fifth suppression method in FIG. 82, the information bits of the FSS and P1 symbols are made to have more redundancy than in the case of a TDM frame in which the subframe is not FDM. , FSS and P1 symbols, the subframes have less redundancy than the TDM frame without FDM. The amount of information that can be transmitted in a symbol decreases.

However, on the other hand, in the fifth FDM TDM frame used in the fifth suppression method, the FSS and P1 symbols are set so that the subframes have more redundancy than in the case of a non-FDM TDM frame. This improves robustness. Furthermore, in the fifth FDM-modified TDM frame used in the fifth suppression method, the required CNR for partial reception is improved compared to the case of the normal FDM-modified TDM frame in FIG. deterioration of reception performance can be suppressed. However, the degree of improvement in the required CNR with the fifth suppression method may be inferior to the degree of improvement in the required CNR with the first suppression method, depending on the degree of redundancy.

Note that here, we decided to provide more redundancy in the FSS of the FDM TDM frame and the information bits of the P1 symbol than in the case of a TDM frame in which the subframe is not FDM, but the information bits of the P2 symbol also have more redundancy. P2 symbols can be configured to have similar redundancy.

<Processing of transmitting device 20>

FIG. 83 is a flowchart illustrating an example of the processing of the transmitting device 20 of FIG. 76 when a partial reception service is provided in the transmission system 1 using the first to fifth FDM-converted TDM frames.

In step S111, the data processing unit 221 (generation unit) of the transmitting device 20 processes the stream from the data processing device 10 to generate an FDM TDM frame (for example, any of the first to fifth FDM TDM frames). ) is generated, and the process proceeds to step S112.

In step S112, the modulation unit 212 (transmission unit) of the transmitting device 20 performs necessary processing on the FDM TDM frame generated by the data processing unit 221, and transmits a broadcast signal of the FDM TDM frame obtained as a result.

When the first suppression method is adopted, the data processing unit 221 determines that the frequency band of the FSS and P1 symbol is a frequency within the frequency band (partial band) of layer A that provides partial reception service, as explained in FIG. A first FDM TDM frame is generated in which narrowband FSS and P1 symbols are placed in the band.

When the second suppression method is adopted, the data processing unit 221 determines that the frequency band of the FSS and P1 symbol is the frequency band (partial band) of layer A that provides partial reception service, and the layer A second FDM TDM frame is generated in which divided FSS and P1 symbols are arranged, which are divided into a frequency band of a hierarchy B on the left side, which is a hierarchy other than A, and a frequency band of a hierarchy B on the right side.

When the third suppression method is adopted, the data processing unit 221 determines that the frequency band of the FSS and P1 symbol is a frequency within the frequency band (partial band) of layer A that provides partial reception service, as explained in FIG. Generates a third FDM TDM frame in which narrowband FSS and P1 symbols that have been narrowed into bands and full-band FSS and P1 symbols that are FSS and P1 symbols before band narrowing are arranged in the time direction. do.

When the fourth suppression method is adopted, the data processing unit 221 uses the frequency band (partial band) of layer A, which provides partial reception service, of the FSS and P1 symbol frequency bands, as explained in FIG. A fourth FDM TDM frame is generated in which the power of the FSS and P1 symbol is boosted to be larger than the power of other frequency bands. Boosting can be performed by multiplying symbols (signal points) on the IQ constellation by a predetermined value.

When the fifth suppression method is adopted, the data processing unit 221 provides more redundancy to the information bits of the FSS and P1 symbols than in the case of a TDM frame in which the subframe is not FDMized, as explained in FIG. A fifth FDM TDM frame is generated in which the FSS and P1 symbols are arranged so that the FSS and P1 symbols are arranged so as to

<Processing of receiving device 30>

FIG. 84 is a flowchart illustrating an example of the processing of the receiving device 30 in FIG. 76 when a partial reception service is provided in the transmission system 1 using the first to fifth FDM-converted TDM frames.

In step S121, the RF section 311 (receiving section) of the receiving device 30 receives the broadcast signal transmitted (transmitted) from the transmitting device 20, and the process proceeds to step S122.

In step S122, the demodulation unit 332 (processing unit) of the receiving device 30 processes the FDM-converted TDM frame obtained from the broadcast signal received by the RF unit 311, and the process proceeds to step S123.

When performing partial reception, the RF section 311 receives a broadcast signal in the layer A frequency band (narrow band). The demodulation section 332 detects the FSS from the layer A portion of the FDM-converted TDM frame obtained from the broadcast signal received by the RF section 311. The demodulator 332 recognizes the beginning of the FDM-converted TDM frame using the FSS, and acquires P1 signaling from the layer A portion of the P1 symbol immediately after the FSS. The demodulator 332 uses P1 signaling to extract P2 signaling from the layer A portion of the P2 symbol, and uses P2 signaling to extract the layer A portion of (the data symbol of) the subframe. The demodulator 332 obtains a stream of transmission data from the layer A portion of the subframe.

Note that when the third suppression method among the first to fifth suppression methods is adopted, the narrowband FSS and P1 symbol shown in FIG. 80 and the narrowband FSS of the full-band FSS and P1 are used. and P1 symbols are used for processing the FDM-converted TDM frame.

In step S123, the data processing unit 313 of the receiving device 30 processes the stream acquired by the demodulating unit 332, and acquires upper layer signaling and component streams. By processing upper layer signaling and component streams, content such as broadcast programs is played back.

<Example of P2 symbol configuration>

FIG. 85 is a diagram illustrating a configuration example of an FDM-converted P2 symbol arranged in an FDM-converted TDM frame.

In FIG. 85, the P2 symbol (and subframes not shown in FIG. 85) are FDMed into layer A and layer B.

FIG. 85 shows a case where one (OFDM) symbol P2 symbol is arranged and a case where two P2 symbols are arranged. Note that three or more symbols can be arranged as P2 symbols.

In the layer A part of the P2 symbol, fixed length L1B signaling (P2 basic information) (P2 symbol) is placed from the beginning (lower frequency), followed by variable length L1D signaling (P2 detailed information). Information) (P2 symbol) is placed. Furthermore, data (payload data) (subframe data symbol) is arranged in the remaining portion of the layer A portion of the P2 symbol.

The L1D signaling (P2 detailed information) arranged in the layer A part of the P2 symbol can include only information about layer A (L1D signaling necessary for partial reception), or it can include information about layer A and information about layer B. Information (L1D signaling required for full-band reception) can also be included.

In the layer B portion of the P2 symbol, variable length L1D signaling (P2 detailed information) is arranged from the beginning, and data (payload data) is arranged in the remaining part. L1D signaling (P2 detailed information) placed in the layer B portion of the P2 symbol can include only information regarding layer B.

If the variable length L1D signaling (P2 detailed information) arranged in the layer A or layer B part of the P2 symbol fits in one (OFDM) symbol, one P2 symbol is arranged.

If the variable length L1D signaling (P2 detailed information) arranged in the layer A or layer B part of the P2 symbol cannot fit into one symbol, two (or more) P2 symbols are arranged.

<Syntax of P1 signaling and P2 signaling>

The syntax of P1 signaling (P1-1 signaling and P1-2 signaling) of P1 symbols and the syntax of P2 signaling (L1B signaling and L1D signaling) of P2 symbols arranged in an FDM TDM frame will be explained below. .

FIG. 86 is a diagram illustrating an example of the syntax of P1-1 signaling.

P1-1 signaling (P1_symbol_1 ()) has 1-bit emergency_warning, 2-bit band_width, 1-bit partial_reception_flag, and 4-bit next_frame.

emergency_warning is an emergency information flag indicating the presence or absence of emergency information, and band_width indicates the frequency band of the P2 symbol. partial_reception_flag represents whether partial reception service is provided, and next_frame represents the time range up to the P1 symbol of the next FDM-converted TDM frame.

FIG. 87 is a diagram illustrating an example of the semantics of emergency_warning.

If there is no emergency information, emergency_warning is set to 0b, and if there is emergency information, emergency_warning is set to 1b. b indicates that the number before it is a binary number.

FIG. 88 is a diagram illustrating an example of the semantics of band_width.

In FIG. 88, the frequency bands (modes) of the P2 symbol include normal mode and compatible mode.

In normal mode, the channel transmission band (eg, 6 MHz) is frequency-divided into 35 segments, and the frequency band of the 35 segments (eg, 5.83 MHz) is the frequency band of the P2 symbol.

In the compatibility mode, 33 of the 35 segments and the adjustment band are the frequency band of the P2 symbol. The adjustment band is a frequency band on both sides of 33 segments to make the frequency band of the P2 symbol the same signal bandwidth as ISDB-T (5.57 Mz).

If the frequency band of the P2 symbol is in normal mode, band_width is set to 01b, and if the frequency band of P2 symbol is in compatible mode, band_width is set to 10b.

Regarding band_width, 00b and 11b are reserved (for the future).

FIG. 89 is a diagram illustrating an example of the semantics of partial_reception_flag.

If partial reception service is not provided, partial_reception_flag is set to 0b, and if partial reception service is provided, partial_reception_flag is set to 1b.

FIG. 90 is a diagram illustrating an example of the semantics of next_frame.

Regarding next_frame, each time range is assigned to each of the values 0000b to 0110b, and the values 0111b to 1111b are reserved.

Next_frame is set to a value assigned to a time range that includes the time up to the P1 symbol of the next FDM-converted TDM frame.

FIG. 91 is a diagram showing an example of the syntax of P1-2 signaling.

P1-2 signaling (P1_symbol_2()) has 2 bits of P2_Basic_fec_type, 2 bits of P2_Basic_fft_size, 2 bits of P2_Basic_cp_pattern, and 2 bits of P2_Basic_guard_interval.

P2_Basic_fec_type represents the FEC type of L1B signaling (P2 basic information). The FEC type is a combination of an error correction code and a modulation method. Here, two types of FEC are available: Mode 2 and Mode 5.

P2_Basic_fft_size represents the FFT size of L1B signaling (including P2 symbols). P2_Basic_cp_pattern represents the pilot pattern of L1B signaling (including P2 symbols), and P2_Basic_guard_interval represents the guard interval length of L1B signaling (including P2 symbols).

FIG. 92 is a diagram illustrating an example of the semantics of P2_Basic_fec_type.

When the FEC type of L1B signaling is Mode 2, 00b is set to P2_Basic_fec_type, and when the FEC type of L1B signaling is Mode 5, 01b is set to P2_Basic_fec_type.

Regarding P2_Basic_fec_type, 10b and 11b are reserved.

FIG. 93 is a diagram illustrating an example of the semantics of P2_Basic_fft_size.

When the FFT sizes of L1B signaling are 8k, 16k, and 32k, 00b, 01b, and 10b are set to P2_Basic_fft_size, respectively.

Regarding P2_Basic_fft_size, 11b is reserved.

FIG. 94 is a diagram illustrating an example of the semantics of P2_Basic_cp_pattern.

Regarding P2_Basic_cp_pattern, each pilot pattern is assigned to each of the values 00b to 11b. In FIG. 94, DX represents the arrangement period of the pilot signal (symbols (subcarriers) thereof) in the frequency direction, and DY represents the arrangement period of the pilot signal in the time direction.

P2_Basic_cp_pattern is set to a value assigned to a pilot pattern representing the arrangement of pilot signals in L1B signaling, depending on the arrangement.

FIG. 95 is a diagram illustrating an example of the semantics of P2_Basic_guard_interval.

Regarding P2_Basic_guard_interval, values 00b to 11b are each assigned a value as a guard interval length. In FIG. 95, the ratio of the guard interval length to the symbol length is used as the value of the guard interval length. In FIG. 95, N _FFT is the FFT size represented by P2_Basic_fft_size in FIG. 93.

P2_Basic_guard_interval is set to a value assigned to the guard interval length according to the guard interval length of L1B signaling.

FIG. 96 is a diagram illustrating an example of the syntax of L1B signaling.

L1B signaling (P2 basic information) (P2B_signaling ()) includes 3 bits of P2B_version, 2 bits of P2B_num_subframes, 3 bits of P2B_pilot_phase, 8 bits of P2B_P2_Detail_size_bytes, 2 bits of P2B_P2_Detail_fec_type, 14 bits of P2B_reserved, and 32 bits of P2B_CRC. has.

P2B_version represents the version of L1B signaling (P2 basic information), and P2B_num_subframes represents the number of subframes. P2B_pilot_phase represents the phase information of the pilot signal, and P2B_P2_Detail_size_bytes represents the size of L1D signaling (P2 detailed information). P2B_P2_Detail_fec_type represents the FEC type of L1D signaling (P2 detailed information), and P2B_reserved is an unused bit (reserved). P2B_CRC is a CRC (Cyclic Redundancy Check) code of L1B signaling (from P2B_version to P2B_reserved).

FIG. 97 is a diagram illustrating an example of the semantics of P2B_Detail_fec_type.

The semantics of P2B_Detail_fec_type in FIG. 97 is the same as the semantics of P2_Basic_fec_type in FIG. 92, so the explanation will be omitted.

FIG. 98 is a diagram illustrating an example of L1D signaling syntax.

L1D signaling (P2 detailed information) (P2D_signaling ()) has 4-bit P2D_version and 1-bit P2D_time_info_flag.

P2D_version represents the version of L1D signaling (P2 detailed information), and P2D_time_info_flag is a flag indicating the presence or absence of time information.

When P2D_time_info_flag indicates that there is time information, L1D signaling further includes a 2-bit P2D_ntp_leap_indicator and a 64-bit P2D_ntp_time.

P2D_ntp_leap_indicato is a leap second indicator, and P2D_ntp_time is time information in NTP format.

L1D signaling further includes 1 bit P2D_eas_wake_up.

P2D_eas_wake_up is a flag indicating the presence or absence of emergency earthquake motion information.

If P2D_eas_wake_up indicates that there is emergency earthquake motion information, the L1D signaling further includes a 95-bit P2D_eas_code.

P2D_eas_code is emergency earthquake motion information.

L1D signaling further includes 2 bits P2D_subframe_fft_size, 3 bits P2D_subframe_guard_interval, 4 bits P2D_subframe_scattered_pilot_pattern, 11 bits P2D_subframe_num_ofdm_symbols, 1 bit P2D_subframe_bs_first, 1 bit P2D_subframe_bs_last, and 2 bits P2D_num_layers. The set of P2B_num_subframes in Figure 96 It has as many subframes as it represents.

P2D_subframe_fft_size represents the FFT size of the subframe, and P2D_subframe_guard_interval represents the guard interval length of the subframe. P2D_subframe_scattered_pilot_pattern represents a pilot pattern of a subframe, and P2D_subframe_num_ofdm_symbols represents the number of (OFDM) symbols configuring a subframe. P2D_subframe_bs_firs represents the presence or absence of a BS at the beginning of a subframe, and P2D_subframe_bs_last represents the presence or absence of a BS at the end of a subframe. P2D_num_layers represents the number of layers within the subframe (how many layers are subjected to FDM).

L1D signaling further includes 7 bits of P2D_layer_num_subsegments, 3 bits of P2D_layer_carrier_modulation, 1 bit of P2D_layer_constellation_type, 2 bits of P2D_layer_code_length, 4 bits of P2D_layer_code_rate, 3 bits of P2D_layer_time_interleaving_depth, 3 bits of P2D_layer_data_boost, and 16 bits of P2D_ set layer_fec_block_pointer , each subframe has the number of layers represented by P2D_num_layers.

P2D_layer_num_subsegments represents the number of segments in the subframe layer, and P2D_layer_carrier_modulation represents the modulation method of data symbols (subcarriers) in the subframe layer. P2D_layer_constellation_type represents the type (identification) of the constellation of data symbols in the subframe layer, and P2D_layer_code_length represents the code length of the error correction code in the subframe layer. P2D_layer_code_rate represents the coding rate of the error correction code, and P2D_layer_time_interleaving_depth represents the time interleaving length of the subframe layer. P2D_layer_data_boost represents the boost ratio of data symbols (subcarriers (data carriers)) in the subframe layer to the default power. P2D_layer_fec_block_pointer is an FEC block pointer that indicates the start position of the FEC block in the subframe layer.

The L1D signaling further includes a variable length Auxiliary_data (), a required number of bits of P2D_reserved, and a 32-bit P2D_CRC.

Auxiliary_data () is auxiliary transmission control auxiliary information that can be used for transmission control, etc.

P2D_reserved is the number of unused bits necessary for byte alignment of L1D signaling.

P2D_CRC is a CRC code for L1D signaling.

FIG. 99 is a diagram illustrating an example of the semantics of P2D_ntp_leap_indicator.

When instructing not to insert or delete leap seconds (no warning), P2D_ntp_leap_indicator is set to 00b. When instructing to delete leap seconds, that is, when making the last minute 59 seconds, P2D_ntp_leap_indicator is set to 01b. When instructing to insert a leap second, that is, when making the last minute 61 seconds, P2D_ntp_leap_indicator is set to 10b. When warning that the leap second is unknown, that is, when the number of seconds in the last minute is unknown, P2D_ntp_leap_indicator is set to 11b.

FIG. 100 is a diagram illustrating an example of the semantics of P2D_subframe_fft_size.

In FIG. 100, the semantics of P2D_subframe_fft_size are the same as the semantics of P2_Basic_fft_size in FIG. 93, so a description thereof will be omitted.

FIG. 101 is a diagram illustrating an example of the semantics of P2D_subframe_guard_interval.

Regarding P2D_subframe_guard_interval, values 000b to 101b are respectively assigned as guard interval lengths, and values 110b to 111b are reserved. In FIG. 101, as in FIG. 95, the ratio of the guard interval length to the symbol length is used as the value of the guard interval length. In FIG. 101, N _FFT is the FFT size represented by P2D_subframe_fft_size in FIG. 100.

P2D_subframe_guard_interval is set to a value assigned to the guard interval length according to the guard interval length of the subframe.

FIG. 102 is a diagram illustrating an example of the semantics of P2D_subframe_scattered_pilot_pattern.

Regarding P2D_subframe_scattered_pilot_pattern, each pilot pattern is assigned to each of the values 0000b to 1101b, and the values 1110b to 1111b are reserved. In FIG. 102, DX represents the arrangement period of the pilot signal in the frequency direction, and DY represents the arrangement period of the pilot signal in the time direction.

P2D_subframe_scattered_pilot_pattern is set to a value assigned to a pilot pattern representing the arrangement of pilot signals in a subframe, depending on the arrangement of the pilot signals.

FIG. 103 is a diagram illustrating an example of the semantics of P2D_layer_num_subsegments.

Regarding P2D_layer_num_subsegments, the number of segments in the range of 1/3 segment to 35 segments is assigned to each of the values 0000000b to 1101000b in 1/3 segment units, and the values 1101001b to 1111111b are reserved.

P2D_layer_num_subsegments is set to a value assigned to the number of segments, depending on the number of segments configuring the subframe hierarchy.

FIG. 104 is a diagram illustrating an example of the semantics of P2D_layer_carrier_modulation.

When the modulation method of subcarriers in the subframe layer is QPSK, 16 QAM, 64 QAM, 256 QAM, 1024 QAM, or 4096 QAM, 000b to 101b are set in P2D_layer_carrier_modulation, respectively.

Regarding P2D_layer_carrier_modulation, 110b to 111b are reserved.

FIG. 105 is a diagram illustrating an example of the semantics of P2D_layer_constellation_type.

When the constellation of data symbols (subcarriers) in the subframe layer is UC (Uniform Constellation) or NUC (Non Uniform Constellation), 0b or 1b is set in P2D_layer_constellation_type, respectively.

FIG. 106 is a diagram illustrating an example of the semantics of P2D_layer_code_length.

In this embodiment, for example, 17280 (17k) bits (Short) and 69120 (69k) bits (Normal) are prepared as code lengths of the error correction code (eg, LDPC code). When the code length of the error correction code in the subframe layer is Short or Normal, 00b or 01b is set to P2D_layer_code_length, respectively.

Regarding P2D_layer_code_length, 10b and 11b are reserved.

FIG. 107 is a diagram illustrating an example of the semantics of P2D_layer_code_rate.

In this embodiment, for example, 2/16 to 14/16 are prepared as the coding rate of the error correction code. When the coding rate of the error correction code in the layer of the subframe is 2/16 to 14/16, 0000b to 1100b are set to P2D_layer_code_rate, respectively.

Regarding P2D_layer_code_rate, 1101b to 1111b are reserved.

FIG. 108 is a diagram illustrating an example of the semantics of P2D_layer_time_interleaving_length.

When the time interleaving length I of the subframe layer is 0, 0.25, 0.5, 0.75, 1, 1.5, 2, or 3, P2D_layer_time_interleaving_length is set to 000b to 111b, respectively.

FIG. 109 is a diagram illustrating an example of the semantics of P2D_layer_data_boost.

When the boost ratio of data symbols (subcarriers (data carriers)) in the subframe layer is 0 dB, 2 to 8 dB, 000b to 111b are set to P2D_layer_data_boost, respectively.

FIG. 110 is a diagram showing an example of the syntax of Auxiliary_data ().

Auxiliary_data () has 3 bits of aux_num_data. aux_num_data represents the number of transmission control auxiliary information.

Auxiliary_data ( ) further has sets of 8-bit aux_data_type and 8-bit aux_data_size for the number of transmission control auxiliary information represented by aux_num_data.

In aux_data_type, following aux_data_type and aux_data_size, transmission control auxiliary information of the type represented by aux_data_type is placed repeatedly as many times as there are transmission control auxiliary information represented by aux_num_data.

FIG. 111 is a diagram showing an example of the syntax of P2 signaling that combines L1B signaling and L1D signaling.

The P2 signaling (P2_signaling()) (P2 information) in Figure 111 consists of the variables that configure the L1B signaling (P2 basic information) (P2B) in Figure 96 and the L1D signaling (P2 detailed information) (P2D) in Figure 98. Since it consists of variables, its explanation will be omitted.

FIG. 112 is a diagram illustrating a specific example of the FEC type.

As described with reference to FIG. 91, there are two types of FEC types, Mode 2 and Mode 5, which are combinations of error correction codes and modulation schemes.

Mode 2 represents a combination of an error correction code with a coding rate of 3/16 and a code length of 17280 bits (Short) and QPSK.

Mode 5 represents a combination of an error correction code with a coding rate of 6/16 and a code length of 17280 bits and 64NUC (64QAM-NUC).

For example, only Mode 2 can be adopted for L1B signaling (P2 basic information), and Mode 2 and Mode 5 can be selectively adopted for L1D signaling (P2 detailed information).

Note that the information bit K _sig of L1B signaling has a fixed length of 64 bits. The information bit K _sig of L1D signaling (P2 detailed information) has a variable length of 106 bits or more. When the information bit K _sig of L1D signaling (P2 detailed information) is the minimum value 106, there is no time information (P2D_ntp_time in Figure 98), the number of subframes (P2B_num_subframes in Figure 96) is 1, and the number of subframe layers This is the case when (P2D_num_layers in FIG. 98) is 1.

<Computer configuration>

The series of processes described above can be executed by hardware or software. When a series of processes is executed by software, the programs that make up the software are installed on the computer. FIG. 113 is a diagram showing an example of a hardware configuration of a computer that executes the above-described series of processes using a program.

In the computer 1000, a CPU (Central Processing Unit) 1001, a ROM (Read Only Memory) 1002, and a RAM (Random Access Memory) 1003 are interconnected by a bus 1004. An input/output interface 1005 is further connected to the bus 1004. An input section 1006, an output section 1007, a recording section 1008, a communication section 1009, and a drive 1010 are connected to the input/output interface 1005.

The input unit 1006 includes a keyboard, a mouse, a microphone, and the like. The output unit 1007 includes a display, a speaker, and the like. The recording unit 1008 includes a hard disk, nonvolatile memory, and the like. The communication unit 1009 includes a network interface and the like. The drive 1010 drives a removable recording medium 1011 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory.

In the computer 1000 configured as described above, the CPU 1001 loads the program recorded in the ROM 1002 or the storage unit 1008 into the RAM 1003 via the input/output interface 1005 and the bus 1004 and executes it. A series of processing is performed.

A program executed by the computer 1000 (CPU 1001) can be provided by being recorded on a removable recording medium 1011 such as a package medium, for example. Additionally, programs may be provided via wired or wireless transmission media, such as local area networks, the Internet, and digital satellite broadcasts.

In the computer 1000, a program can be installed in the recording unit 1008 via the input/output interface 1005 by installing a removable recording medium 1011 into the drive 1010. Further, the program can be received by the communication unit 1009 via a wired or wireless transmission medium and installed in the recording unit 1008. Other programs can be installed in the ROM 1002 or the recording unit 1008 in advance.

Here, in this specification, the processing that a computer performs according to a program does not necessarily need to be performed in chronological order in the order described as a flowchart. That is, the processing that a computer performs according to a program includes processing that is performed in parallel or individually (for example, parallel processing or processing using objects). Furthermore, the program may be processed by one computer (processor) or may be distributed and processed by multiple computers.

Note that the embodiments of the present technology are not limited to the embodiments described above, and various changes can be made without departing from the gist of the present technology.

For example, the present technology can take a cloud computing configuration in which one function is shared and jointly processed by a plurality of devices via a network.

Moreover, each step explained in the above-mentioned flowchart can be executed by one device or can be shared and executed by a plurality of devices.

Furthermore, when one step includes multiple processes, the multiple processes included in that one step can be executed by one device or can be shared and executed by multiple devices.

Moreover, the effects described in this specification are merely examples and are not limited, and other effects may also be present.

Furthermore, in this specification, a system refers to a collection of multiple components (devices, modules (components), etc.), regardless of whether all the components are located in the same casing. Therefore, multiple devices housed in separate casings and connected via a network, and a single device with multiple modules housed in one casing are both systems. .

1 transmission system, 10, 10-1 to 10-N data processing device, 20 transmitting device, 30, 30-1 to 30-M receiving device, 40, 40-1 to 40-N communication line, 50 broadcasting transmission line, 111 component processing unit, 112 signaling generation unit, 113 multiplexer, 114 data processing unit, 211 data processing unit, 212 modulation unit, 221 data processing device, 311 RF unit, 312 demodulation unit, 313 data processing unit, 332 demodulation unit, 1000 computer, 1001 CPU

The fifth transmission method/device of the present technology is configured by arranging an FSS (Frame Sync Symbol), 1 P (Preamble) symbol, P2 symbol, and one or more subframes from the beginning in time order. a generation step/unit for generating an FDM TDM frame, which is a TDM (Time Division Multiplexing) physical layer frame, in which at least the subframe is an FDM (Frequency Division Multiplexing) physical layer frame; the FDM-enabled TDM frame has more redundancy in the information bits of the FSS and the P1 symbol than in the case of a TDM physical layer frame in which subframes are not FDM-enabled. The transmission method/apparatus is an FDM-converted TDM frame in which the FSS and the P1 symbol are arranged so as to have the FSS and the P1 symbol. For example, the FDM TDM frame is an FDM TDM frame in which the FSS and the P1 symbol are arranged so that the same information is transmitted multiple times.

The fifth receiving device/method of the present technology is configured by arranging an FSS (Frame Sync Symbol), 1 P (Preamble) symbol, P2 symbol, and one or more subframes from the beginning in chronological order. a receiving unit/step for receiving an FDM TDM frame which is a physical layer frame of TDM (Time Division Multiplexing) and in which at least the subframes are FDM (Frequency Division Multiplexing); the FDM-enabled TDM frame has more redundancy in the information bits of the FSS and the P1 symbol than in the case of a TDM physical layer frame in which subframes are not FDM-enabled. The receiving apparatus/method is an FDM-converted TDM frame in which the FSS and the P1 symbol are arranged so as to have the FSS and the P1 symbol. For example, the FDM TDM frame is an FDM TDM frame in which the FSS and the P1 symbol are arranged so that the same information is transmitted multiple times.

In the fifth transmission method/device of the present technology, an FSS (Frame Sync Symbol), a P (Preamble) symbol, a P2 symbol, and one or more subframes are arranged from the beginning in time order. An FDM TDM frame, which is a TDM (Time Division Multiplexing) physical layer frame in which at least the subframes are FDM (Frequency Division Multiplexing) physical layer frames, is generated and transmitted. The FDM TDM frame includes the FSS and the P1 symbol configured to have more redundancy in the information bits of the FSS and the P1 symbol than in the case of a TDM physical layer frame in which subframes are not FDMized. It is an FDM TDM frame with . For example, the FDM TDM frame is an FDM TDM frame in which the FSS and the P1 symbol are arranged so that the same information is transmitted multiple times.

In the fifth receiving device/method of the present technology, an FSS (Frame Sync Symbol), a P (Preamble) symbol, a P2 symbol, and one or more subframes are arranged from the beginning in time order. An FDM TDM frame, which is a TDM (Time Division Multiplexing) physical layer frame in which at least the subframe is FDM (Frequency Division Multiplexing) physical layer frame, is received and processed. The FDM TDM frame includes the FSS and the P1 symbol configured to have more redundancy in the information bits of the FSS and the P1 symbol than in the case of a TDM physical layer frame in which subframes are not FDMized. It is an FDM TDM frame with . For example, the FDM TDM frame is an FDM TDM frame in which the FSS and the P1 symbol are arranged so that the same information is transmitted multiple times.

Claims (20)

A TDM (Time Division Multiplexing) physical layer frame consisting of an FSS (Frame Sync Symbol), 1 P (Preamble) symbol, P2 symbol, and one or more subframes arranged in chronological order from the beginning. a generation step of generating an FDM TDM frame in which at least the subframe is a physical layer frame subjected to FDM (Frequency Division Multiplexing);
a transmitting step of transmitting the FDM-modified TDM frame;
The FDM TDM frame is an FDM TDM frame in which the frequency band of the FSS and the P1 symbol is narrowed and the narrow band FSS and P1 symbol are arranged in a frequency band within a partial band that provides partial reception service. is the transmission method. The transmission method according to claim 1, wherein the FDM-enabled TDM frame is an FDM-enabled TDM frame in which a narrowband P2 symbol in which the frequency band of the P2 symbol is narrowed to a frequency band within the partial band is arranged. A TDM (Time Division Multiplexing) physical layer frame consisting of an FSS (Frame Sync Symbol), 1 P (Preamble) symbol, P2 symbol, and one or more subframes arranged in chronological order from the beginning. a receiving unit that receives an FDM TDM frame, which is a physical layer frame in which at least the subframe is FDM (Frequency Division Multiplexing);
a processing unit that processes the FDM-converted TDM frame;
The FDM TDM frame is an FDM TDM frame in which the frequency band of the FSS and the P1 symbol is narrowed and the narrow band FSS and P1 symbol are arranged in a frequency band within a partial band that provides partial reception service. is a receiving device. The receiving device according to claim 3, wherein the FDM TDM frame is an FDM TDM frame in which a narrow band P2 symbol in which the frequency band of the P2 symbol is narrowed to a frequency band within the partial band is arranged. A TDM (Time Division Multiplexing) physical layer frame consisting of an FSS (Frame Sync Symbol), 1 P (Preamble) symbol, P2 symbol, and one or more subframes arranged in chronological order from the beginning. a generation step of generating an FDM TDM frame in which at least the subframe is a physical layer frame subjected to FDM (Frequency Division Multiplexing);
a transmitting step of transmitting the FDM-modified TDM frame;
The FDM TDM frame is an FDM TDM frame in which the frequency band of the FSS and P1 symbol is divided into a partial band providing partial reception service and a frequency band other than the partial band, and a divided FSS and P1 symbol are arranged. Frame transmission method. The transmission method according to claim 5, wherein the FDM TDM frame is an FDM TDM frame in which divided P2 symbols in which the frequency band of the P2 symbol is divided into the partial band and a frequency band other than the partial band are arranged. . A TDM (Time Division Multiplexing) physical layer frame consisting of an FSS (Frame Sync Symbol), 1 P (Preamble) symbol, P2 symbol, and one or more subframes arranged in chronological order from the beginning. a receiving unit that receives an FDM TDM frame, which is a physical layer frame in which at least the subframe is FDM (Frequency Division Multiplexing);
a processing unit that processes the FDM-converted TDM frame;
The FDM TDM frame is an FDM TDM frame in which the frequency band of the FSS and P1 symbol is divided into a partial band providing partial reception service and a frequency band other than the partial band, and a divided FSS and P1 symbol are arranged. A receiving device that is a frame. The receiving device according to claim 7, wherein the FDM TDM frame is an FDM TDM frame in which divided P2 symbols in which the frequency band of the P2 symbol is divided into the partial band and a frequency band other than the partial band are arranged. . A TDM (Time Division Multiplexing) physical layer frame consisting of an FSS (Frame Sync Symbol), 1 P (Preamble) symbol, P2 symbol, and one or more subframes arranged in chronological order from the beginning. a generation step of generating an FDM TDM frame in which at least the subframe is a physical layer frame subjected to FDM (Frequency Division Multiplexing);
a transmitting step of transmitting the FDM-modified TDM frame;
The FDM TDM frame includes narrowband FSS and P1 symbols in which the frequency bands of the FSS and P1 symbols are narrowed to a frequency band within a partial band that provides partial reception service, and narrowband FSS and P1 symbols that are The transmission method is an FDM-converted TDM frame in which the full-band FSS and the P1 symbol, which are the FSS and the P1 symbol, are arranged in the time direction. The FDM TDM frame includes a narrowband P2 symbol in which the frequency band of the P2 symbol is narrowed to a frequency band within the partial band, and a full-band P2 symbol that is the P2 symbol before band narrowing. The transmission method according to claim 9, wherein the transmission method is an FDM TDM frame arranged in the time direction. A TDM (Time Division Multiplexing) physical layer frame consisting of an FSS (Frame Sync Symbol), 1 P (Preamble) symbol, P2 symbol, and one or more subframes arranged in chronological order from the beginning. a receiving unit that receives an FDM TDM frame, which is a physical layer frame in which at least the subframe is FDM (Frequency Division Multiplexing);
a processing unit that processes the FDM-converted TDM frame;
The FDM TDM frame includes narrowband FSS and P1 symbols in which the frequency bands of the FSS and P1 symbols are narrowed to a frequency band within a partial band that provides partial reception service, and narrowband FSS and P1 symbols that are The receiving device is an FDM-converted TDM frame in which the full-band FSS and the P1 symbol, which are the FSS and the P1 symbol, are arranged in the time direction. The FDM TDM frame includes a narrowband P2 symbol in which the frequency band of the P2 symbol is narrowed to a frequency band within the partial band, and a full-band P2 symbol that is the P2 symbol before band narrowing. 12. The receiving device according to claim 11, wherein the receiving device is an FDM-converted TDM frame arranged in the time direction. A TDM (Time Division Multiplexing) physical layer frame consisting of an FSS (Frame Sync Symbol), 1 P (Preamble) symbol, P2 symbol, and one or more subframes arranged in chronological order from the beginning. a generation step of generating an FDM TDM frame in which at least the subframe is a physical layer frame subjected to FDM (Frequency Division Multiplexing);
a transmitting step of transmitting the FDM-modified TDM frame;
The FDM-converted TDM frame boosts the power of the FSS and the P1 symbol in a partial band that provides partial reception service among the frequency bands of the FSS and the P1 symbol, and boosts the power of the FSS and the P1 symbol more than the power of other frequency bands. Transmission method: Larger FDM TDM frame. 14. The FDM TDM frame is an FDM TDM frame in which the power of the P2 symbol in the partial band of the frequency band of the P2 symbol is boosted to be larger than the power in other frequency bands. Sending method described. A TDM (Time Division Multiplexing) physical layer frame consisting of an FSS (Frame Sync Symbol), 1 P (Preamble) symbol, P2 symbol, and one or more subframes arranged in chronological order from the beginning. a receiving unit that receives an FDM TDM frame, which is a physical layer frame in which at least the subframe is FDM (Frequency Division Multiplexing);
a processing unit that processes the FDM-converted TDM frame;
The FDM-converted TDM frame boosts the power of the FSS and the P1 symbol in a partial band that provides partial reception service among the frequency bands of the FSS and the P1 symbol, and boosts the power of the FSS and the P1 symbol more than the power of other frequency bands. Receiving device that is a large FDM TDM frame. The FDM TDM frame is an FDM TDM frame in which the power of the P2 symbol in the partial band of the frequency band of the P2 symbol is boosted to be larger than the power in other frequency bands. Receiving device as described. A TDM (Time Division Multiplexing) physical layer frame consisting of an FSS (Frame Sync Symbol), 1 P (Preamble) symbol, P2 symbol, and one or more subframes arranged in chronological order from the beginning. a generation step of generating an FDM TDM frame in which at least the subframe is a physical layer frame subjected to FDM (Frequency Division Multiplexing);
a transmitting step of transmitting the FDM-modified TDM frame;
The FDM TDM frame includes the FSS and the P1 symbol configured to have more redundancy in the information bits of the FSS and the P1 symbol than in the case of a TDM physical layer frame in which subframes are not FDMized. This is an FDM TDM frame with a transmission method. The FDM-enabled TDM frame is an FDM-enabled TDM frame in which the P2 symbol is arranged so that the information bits of the P2 symbol have more redundancy than in the case of a TDM physical layer frame in which subframes are not FDM-enabled. The transmission method according to claim 17, wherein the transmission method is a frame. A TDM (Time Division Multiplexing) physical layer frame consisting of an FSS (Frame Sync Symbol), 1 P (Preamble) symbol, P2 symbol, and one or more subframes arranged in chronological order from the beginning. a receiving unit that receives an FDM TDM frame, which is a physical layer frame in which at least the subframe is FDM (Frequency Division Multiplexing);
a processing unit that processes the FDM-converted TDM frame;
The FDM TDM frame includes the FSS and the P1 symbol configured to have more redundancy in the information bits of the FSS and the P1 symbol than in the case of a TDM physical layer frame in which subframes are not FDMized. A receiving device that is an FDM TDM frame with a The FDM-enabled TDM frame is an FDM-enabled TDM frame in which the P2 symbol is arranged so that the information bits of the P2 symbol have more redundancy than in the case of a TDM physical layer frame in which subframes are not FDM-enabled. The receiving device according to claim 19, which is a frame.

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