Transmitting device and transmitting method

Abstract

To enable more flexible operation to be performed when a plurality of multiplexing methods are materialized in the same broadcasting system.SOLUTION: A transmission device generates a physical layer frame that is multiplexed by a predetermined multiplexing method and includes determination information enabling the multiplexing method to be discriminated and the transmission device transmits the generated physical layer frame as a broadcast signal. Whereas a receiving device receives the broadcast signal, and determines a multiplexing method of the physical layer frame multiplexed by the predetermined multiplexing method on the basis of the determination information included in the physical layer frame obtained from the broadcast signal, and processes the physical layer frame. This technology can be applied to, for example, a transmission system compatible with a broadcasting system of terrestrial digital television broadcasting.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present technology relates to a transmission device and a transmission method, and more particularly to a transmission device and a transmission method that enable more flexible operation when a plurality of multiplexing methods are realized in the same broadcasting system. [Background technology]

[0002] For example, ISDB-T (Integrated Services Digital Broadcasting - Terrestrial), which is adopted by Japan and other countries as a broadcasting method for terrestrial digital television broadcasting, employs frequency division multiplexing (FDM) as a method for multiplexing broadcast signals (see, for example, non-patent document 1). [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] ARIB STD-B31 Version 2.2 Association of Radio Industries and Businesses Summary of the Invention [Problem to be solved by the invention]

[0004] Meanwhile, studies are being conducted to enhance the next generation of terrestrial digital television broadcasting. In addition to frequency division multiplexing (FDM), several broadcasting systems using multiplexing methods such as time division multiplexing (TDM) and layered division multiplexing (LDM) are being considered for the next generation of terrestrial digital television broadcasting.

[0005] However, at present, the technical methods for realizing multiple multiplexing methods using the same broadcasting system have not been established, and there has been a demand for proposals to enable more flexible operation when multiple multiplexing methods are realized in the same broadcasting system.

[0006] The present technology has been developed in light of these circumstances, and enables more flexible operation when implementing multiple multiplexing methods in the same broadcasting system. [Means for solving the problem]

[0007] A transmitting device according to a first aspect of the present technology is a transmitting device comprising: a generating unit that generates a physical layer frame multiplexed using a predetermined multiplexing method, the physical layer frame including discrimination information that enables discrimination of the multiplexing method; and a transmitting unit that transmits the physical layer frame as a broadcast signal.

[0008] The transmission device of the first aspect of the present technology may be an independent device or an internal block constituting one device. Also, the transmission method of the first aspect of the present technology is a transmission method corresponding to the transmission device of the first aspect of the present technology described above.

[0009] In the transmitting device and transmitting method of the first aspect of the present technology, a physical layer frame multiplexed using a predetermined multiplexing method is generated, the physical layer frame including discrimination information that enables discrimination of the multiplexing method, and the physical layer frame is transmitted as a broadcast signal.

[0010] A receiving device according to a first aspect of the present technology is a receiving device comprising a receiving unit that receives a broadcast signal, and a processing unit that determines the multiplexing method of the physical layer frame, which has been multiplexed using a predetermined multiplexing method, based on discrimination information contained in a physical layer frame obtained from the broadcast signal, and processes the physical layer frame.

[0011] The receiving device according to the first aspect of the present technology may be an independent device or an internal block constituting one device. Also, the receiving method according to the first aspect of the present technology is a receiving method corresponding to the receiving device according to the first aspect of the present technology described above.

[0012] In the receiving device and receiving method of the first aspect of the present technology, a broadcast signal is received, and based on discrimination information contained in a physical layer frame obtained from the broadcast signal, the multiplexing method of the physical layer frame, which has been multiplexed using a predetermined multiplexing method, is discriminated, and the physical layer frame is processed.

[0013] A transmitting device according to a second aspect of the present technology is a transmitting device including: a generating unit that generates a physical layer frame multiplexed using a predetermined multiplexing method, the physical layer frame having physical layer signaling concentrated at the beginning of the physical layer frame; and a transmitting unit that transmits the physical layer frame as a broadcast signal.

[0014] The transmission device of the second aspect of the present technology may be an independent device or an internal block constituting one device. Also, the transmission method of the second aspect of the present technology is a transmission method corresponding to the transmission device of the second aspect of the present technology described above.

[0015] In a transmitting device and a transmitting method according to a second aspect of the present technology, a physical layer frame multiplexed using a predetermined multiplexing method is generated, with physical layer signaling concentrated at the beginning of the physical layer frame, and the physical layer frame is transmitted as a broadcast signal.

[0016] A receiving device according to a second aspect of the present technology is a receiving device comprising a receiving unit that receives a broadcast signal, and a processing unit that acquires physical layer signaling concentrated at the beginning of a physical layer frame obtained from the broadcast signal, and processes the physical layer frame.

[0017] The receiving device of the second aspect of the present technology may be an independent device or an internal block constituting one device. Also, the receiving method of the second aspect of the present technology is a receiving method corresponding to the receiving device of the second aspect of the present technology described above.

[0018] In a receiving device and a receiving method according to a second aspect of the present technology, a broadcast signal is received, physical layer signaling concentrated at the beginning of a physical layer frame obtained from the broadcast signal is obtained, and the physical layer frame is processed.

[0019] A transmitting device according to a third aspect of the present technology is a transmitting device including: a generating unit that generates a physical layer frame multiplexed using a predetermined multiplexing method, the physical layer frame having P2 signaling of a P2 symbol arranged therein for each layer; and a transmitting unit that transmits the physical layer frame as a broadcast signal.

[0020] The transmission device of the third aspect of the present technology may be an independent device or an internal block constituting one device. Also, the transmission method of the third aspect of the present technology is a transmission method corresponding to the transmission device of the third aspect of the present technology described above.

[0021] In a transmitting device and a transmitting method according to a third aspect of the present technology, a physical layer frame multiplexed using a predetermined multiplexing scheme is generated, in which P2 signaling of a P2 symbol is arranged for each layer, and the physical layer frame is transmitted as a broadcast signal.

[0022] A receiving device according to a third aspect of the present technology is a receiving device comprising a receiving unit that receives a broadcast signal, and a processing unit that acquires P2 signaling of P2 symbols arranged for each hierarchy of a physical layer frame obtained from the broadcast signal, and processes the physical layer frame.

[0023] The receiving device of the third aspect of the present technology may be an independent device or an internal block constituting one device. Also, the receiving method of the third aspect of the present technology is a receiving method corresponding to the receiving device of the third aspect of the present technology described above.

[0024] In a receiving device and a receiving method of a third aspect of the present technology, a broadcast signal is received, P2 signaling of P2 symbols arranged for each layer of a physical layer frame obtained from the broadcast signal is obtained, and the physical layer frame is processed. Effect of the Invention

[0025] According to the first to third aspects of the present technology, when a plurality of multiplexing methods are implemented in the same broadcasting system, more flexible operation can be achieved.

[0026] Note that the effects described herein are not necessarily limited to those described herein, and may be any of the effects described in this disclosure. [Brief description of the drawings]

[0027] [Figure 1] 1 is a block diagram showing a configuration of an embodiment of a transmission system to which the present technology is applied. [Diagram 2] 2 is a block diagram showing an example of the configuration of the data processing device and the transmission device shown in FIG. 1. [Diagram 3] 2 is a block diagram showing an example of the configuration of a receiving device in FIG. 1. [Figure 4] 1 is a diagram for explaining the concept of a configuration of a physical layer frame to which the present technology is applied. [Diagram 5] FIG. 2 is a diagram illustrating a first example of a configuration of a physical layer frame in the case of time division multiplexing (TDM). [Figure 6] FIG. 11 is a diagram illustrating a second example of the configuration of a physical layer frame in the case of time division multiplexing (TDM). [Figure 7] FIG. 2 is a diagram illustrating an example of the configuration of a physical layer frame in the case of frequency division multiplexing (FDM). [Figure 8]FIG. 2 is a diagram showing details of a physical layer frame structure in the case of frequency division multiplexing (FDM). [Figure 9] FIG. 1 is a diagram illustrating an example of the configuration of a physical layer frame in the case of layer division multiplexing (LDM). [Figure 10] FIG. 1 is a diagram showing the current configuration of a frame synchronization symbol (FSS) and a P1 symbol (P1). [Figure 11] 1 is a diagram showing an overview of the configuration of a frame synchronization symbol (FSS) and a P1 symbol (P1) of the present technology. [Figure 12] FIG. 1 is a diagram showing a comparison between the current configuration and the configuration of the present technology. [Figure 13] FIG. 13 is a diagram showing the relationship between the value of g and the FFT size, samples, maximum transmission rate, and robust transmission rate. [Figure 14] 1 is a diagram showing the relationship between BLER and SNR when FFT=512. [Figure 15] 1 is a diagram showing the relationship between BLER and SNR when FFT=1024. [Figure 16] 1 is a diagram showing the relationship between BLER and SNR when FFT=2048. [Figure 17] 1 is a diagram showing the relationship between BLER and SNR when FFT=4096. [Figure 18] 1 is a diagram showing the relationship between BLER and SNR when FFT=8192. [Figure 19] FIG. 1 is a diagram showing a hierarchical configuration when partial band reception is performed in frequency division multiplexing (FDM). [Figure 20] FIG. 13 is a diagram showing the relationship between BLER and SNR when FFT=1024 in the case of receiving partial bands in a frequency division multiplexing (FDM) system. [Figure 21] 1 is a diagram showing the configuration of a frame synchronization symbol (FSS) and a P1 symbol (P1) according to the present technology. [Figure 22] FIG. 13 is a diagram showing the relationship between the FFT size, samples per symbol, maximum transmission rate, robust transmission rate, number of symbols, maximum number of bits, and total samples. [Figure 23] FIG. 1 is a diagram illustrating an example of the configuration of a P2 symbol in the case of time division multiplexing (TDM). [Figure 24] FIG. 1 is a diagram illustrating a first exemplary configuration of a P2 symbol in the case of frequency division multiplexing (FDM). [Diagram 25] FIG. 11 is a diagram illustrating a second configuration example of a P2 symbol in the case of frequency division multiplexing (FDM). [Figure 26] FIG. 1 is a diagram illustrating a first configuration example of a P2 symbol in the case of layered division multiplexing (LDM). [Figure 27] FIG. 11 is a diagram illustrating a second configuration example of a P2 symbol in the case of layered division multiplexing (LDM). [Figure 28] FIG. 2 is a diagram showing an example of a synchronization pattern of a frame synchronization symbol (FSS). [Figure 29] FIG. 13 is a diagram showing an example of P1 signaling syntax for time division multiplexing (TDM). [Diagram 30] A figure showing an example of the P1_P2_waveform_structure of Figure 29. [Diagram 31] A figure showing an example of P1 signaling syntax for frequency division multiplexing (FDM). [Diagram 32] A figure showing an example of the P1_P2_waveform_structure of Figure 31. [Diagram 33] A figure showing an example of P1 signaling syntax in the case of hierarchical division multiplexing (LDM). [Diagram 34] A figure showing an example of the P1_P2_waveform_structure of Figure 33. [Diagram 35] FIG. 11 is a diagram illustrating an example of a combination of an FFT size and a GI. [Diagram 36] FIG. 13 is a diagram illustrating an example of a combination of an FFT size, a GI, and a pilot pattern. [Figure 37] FIG. 13 is a diagram showing an example of P1 signaling syntax for time division multiplexing (TDM). [Figure 38]A figure showing an example of P1_Frame_Multiplexing in Figure 37. [Figure 39] A figure showing an example of P1 signaling syntax for frequency division multiplexing (FDM). [Diagram 40] A figure showing an example of P1_Frame_Multiplexing in Figure 39. [Diagram 41] A figure showing an example of P1 signaling syntax in the case of hierarchical division multiplexing (LDM). [Diagram 42] A figure showing an example of P1_Frame_Multiplexing in Figure 41. [Diagram 43] A diagram showing an example of L1B signaling syntax for time division multiplexing (TDM). [Diagram 44] A figure showing an example of L1B signaling syntax for frequency division multiplexing (FDM). [Diagram 45] A diagram showing an example of L1B signaling syntax for layered division multiplexing (LDM). [Diagram 46] A figure showing an example of P1 signaling syntax when commonized. [Figure 47] A diagram showing an example of L1B signaling syntax in a common case. [Figure 48] A figure showing a first example of syntax for L1D signaling in the case of time division multiplexing (TDM). [Figure 49] A figure showing a second example of L1D signaling syntax for time division multiplexing (TDM). [Figure 50] A figure showing a first example of syntax for L1D signaling in the case of frequency division multiplexing (FDM). [Figure 51] A figure showing a second example of L1D signaling syntax (layer A) for frequency division multiplexing (FDM). [Figure 52] A figure showing a second example of L1D signaling syntax (layer B) for frequency division multiplexing (FDM). [Diagram 53] A figure showing a third example (layer A) of L1D signaling syntax for frequency division multiplexing (FDM). [Figure 54] A figure showing a third example (layer B) of L1D signaling syntax for frequency division multiplexing (FDM). [Figure 55] A figure showing a first example of syntax for L1D signaling in the case of hierarchical division multiplexing (LDM). [Figure 56] A figure showing a second example of L1D signaling syntax (layer k) for layer division multiplexing (LDM). [Figure 57] A figure showing a second example of L1D signaling syntax for layer division multiplexing (LDM) (layer k+1). [Figure 58] A figure showing a third example (layer k) of L1D signaling syntax for layer division multiplexing (LDM). [Figure 59] A figure showing a third example (layer k+1) of L1D signaling syntax for layer division multiplexing (LDM). [Figure 60] 1 is a diagram showing an example of a concentrated arrangement of L1 signaling in a physical layer frame to which the present technology is applied. [Figure 61] FIG. 1 is a diagram showing an example of the arrangement of a frame synchronization symbol (FSS), a P1 symbol (P1), and a P2 symbol (P2) in the case of frequency division multiplexing (FDM) and hierarchical division multiplexing (LDM). [Figure 62] FIG. 2 is a diagram for explaining the processing on the receiving side for a physical layer frame in the case of time division multiplexing (TDM). [Figure 63] FIG. 1 is a diagram for explaining the processing on the receiving side for a physical layer frame in the case of frequency division multiplexing (FDM). [Figure 64] FIG. 1 is a diagram for explaining the processing on the receiving side for a physical layer frame in the case of frequency division multiplexing (FDM). [Figure 65]FIG. 1 is a diagram for explaining the processing on the receiving side for a physical layer frame in the case of frequency division multiplexing (FDM). [Figure 66] FIG. 1 is a diagram for explaining the processing on the receiving side for a physical layer frame in the case of layer division multiplexing (LDM). [Figure 67] 11 is a flowchart illustrating the flow of processing on the transmitting side and the receiving side corresponding to a first solving method (synchronization pattern solving method). [Figure 68] 11 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). [Figure 69] 13 is a flowchart illustrating a process flow on the transmitting side and the receiving side corresponding to the second solution method. [Figure 70] 13 is a flowchart illustrating a process flow on the transmitting side and the receiving side corresponding to the third solution method (compatible with FDM). [Figure 71] 13 is a flowchart illustrating a process flow on the transmitting side and the receiving side corresponding to the third solution method (compatible with LDM). [Figure 72] FIG. 2 is a block diagram showing an example of the configuration of a computer. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] Hereinafter, an embodiment of the present technology will be described with reference to the drawings. The description will be given in the following order.

[0029] 1. System Configuration 2. Overview of this technology 3.Frame Composition 4. First solution: A method to distinguish the multiplexing method (FDM, TDM, LDM) (1) Synchronization pattern resolution method (2) P1 signaling solution method 5. Configuring P2 signaling (1) L1B signaling configuration (2) L1D signaling configuration 6. Second solution: A method to shorten the time until frame synchronization 7. Third solution: FDM or TDM preamble 8. Operation of the receiving device 9. Process flow for each solution 10. Variations 11. Computer Configuration

[0030] <1. System configuration>

[0031] (Example of a transmission system configuration) 1 is a block diagram showing the configuration of an embodiment of a transmission system to which the present technology is applied. Note that the term "system" refers to a logical collection of multiple devices.

[0032] In FIG. 1, the transmission system 1 is composed of data processing devices 10-1 to 10-N (N is an integer greater than or equal to 1) installed in facilities related to each broadcasting station, a transmitting device 20 installed in a transmitting station, and receiving devices 30-1 to 30-M (M is an integer greater than or equal to 1) owned by end users.

[0033] In the 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. The communication lines 40-1 to 40-N may be, for example, dedicated lines.

[0034] The data processing device 10-1 processes contents such as broadcast programs produced by the broadcasting station A, and transmits the resulting transmission data to the transmitting device 20 via the communication line 40-1.

[0035] 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 each broadcasting station, such as broadcasting station B and broadcasting station Z, are processed, and the resulting transmission data is transmitted to the transmitting device 20 via the communication lines 40-2 to 40-N.

[0036] 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 the transmitting station.

[0037] As a result, the broadcast signal from the transmitting device 20 on the transmitting station side is transmitted via the broadcast transmission path 50 to the receiving devices 30-1 to 30-M.

[0038] The receiving devices 30-1 to 30-M are fixed receivers such as television receivers, set-top boxes (STBs), recorders, game consoles, and network storage, or mobile receivers such as smartphones, mobile phones, tablet computers, etc. The receiving devices 30-1 to 30-M may also be in-vehicle devices mounted on vehicles, such as in-vehicle televisions, or wearable computers, such as head mounted displays (HMDs).

[0039] The receiving device 30-1 receives and processes the broadcast signal transmitted from the transmitting device 20 via the broadcast transmission path 50, thereby reproducing the content such as a broadcast program in response to a channel selection operation by an end user.

[0040] 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 corresponding to a channel selection operation by an end user is reproduced.

[0041] In addition, in the transmission system 1, the broadcast transmission path 50 may be, in addition to terrestrial waves (terrestrial broadcasting), for example, satellite broadcasting using a broadcasting satellite (BS: Broadcasting Satellite) or a communications satellite (CS: Communications Satellite), or cable broadcasting using a cable (CATV: Common Antenna TeleVision).

[0042] 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 need to distinguish them from one another. Also, the receiving devices 30-1 to 30-M will be referred to as receiving devices 30 unless there is a need to distinguish them from one another.

[0043] (Configuration of sending device) FIG. 2 is a block diagram showing an example of the configuration of the data processing device 10 and the transmission device 20 in FIG.

[0044] In FIG. 2, the data processing device 10 includes a component processing unit 111, a signaling generating unit 112, a multiplexer 113, and a data processing unit 114.

[0045] 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, video, audio, subtitles, etc., and processing such as encoding conforming to a predetermined encoding method is performed on this data.

[0046] The signaling generation unit 112 generates signaling used in higher layer processing such as content channel selection and playback, and supplies it to the multiplexer 113. The signaling generation unit 112 also generates signaling used in physical layer processing, and supplies it to the data processing unit 114.

[0047] In addition, the signaling is also called control information. In the following description, the signaling used in the processing of the physical layer is called physical layer signaling (L1 signaling), while the signaling used in the processing of the upper layer, which is a layer higher than the physical layer, is called upper layer signaling to distinguish them.

[0048] The multiplexer 113 multiplexes the component stream supplied from the component processing unit 111 and the higher layer signaling stream supplied from the signaling generation unit 112 , and supplies the resulting stream to the data processing unit 114 . It should be noted that other streams such as applications and time information may also be multiplexed here.

[0049] The data processing unit 114 processes the stream supplied from the multiplexer 113 to generate packets (frames) in a predetermined format. The data processing unit 114 also processes the packets in the predetermined format and physical layer signaling from the signaling generation unit 112 to generate transmission data, and transmits the data to the transmitting device 20 via the communication line 40.

[0050] In FIG. 2, the transmitting device 20 includes a data processing unit 211 and a modulation unit 212 .

[0051] The data processing unit 211 receives and processes the transmission data sent from the data processing device 10 via the communication line 40, and extracts the resulting packets (frames) of a specified format and physical layer signaling information.

[0052] The data processing unit 211 processes packets (frames) in a predetermined format and physical layer signaling information to generate physical layer frames (physical layer frames) that conform to a predetermined broadcasting standard, and supplies them to the modulation unit 212.

[0053] 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 the transmission station.

[0054] The data processing device 10 and the transmission device 20 are configured as described above.

[0055] (Configuration of the receiving device) FIG. 3 is a block diagram showing an example of the configuration of the receiving device 30 of FIG.

[0056] In FIG. 3, the receiving device 30 includes an RF unit 311, a demodulation unit 312, and a data processing unit 313.

[0057] The RF unit 311 is configured by, for example, a tuner etc. The RF unit 311 performs necessary processing on a broadcast signal received via an antenna 321, and supplies the signal obtained thereby to a demodulation unit 312.

[0058] The demodulation unit 312 is composed of, for example, a demodulation LSI (Large Scale Integration) or the like. The demodulation unit 312 performs demodulation processing on the signal supplied from the RF unit 311. In this demodulation processing, for example, a physical layer frame is processed in accordance with physical layer signaling, and a packet in a predetermined format is obtained. The packet obtained by the demodulation processing is supplied to the data processing unit 313.

[0059] The data processing unit 313 is configured by, for example, a main SoC (System On Chip) etc. The data processing unit 313 performs a predetermined process on the packets supplied from the demodulation unit 312. Here, for example, a process of decoding or playing back a stream is performed based on higher layer signaling included in the packets.

[0060] Data such as video, audio, and subtitles obtained by processing in the data processing unit 313 is output to a downstream circuit, whereby the receiving device 30 plays back content such as a broadcast program, and outputs the video and audio.

[0061] The receiving device 30 is configured as described above.

[0062] 2. Overview of this technology

[0063] As mentioned above, in Japan, ISDB-T is adopted as the broadcasting format for terrestrial digital television broadcasting (see, for example, the above-mentioned Non-Patent Document 1).

[0064] ISDB-T specifies high-definition broadcasting using 12 segments, which is primarily intended for fixed receivers, and "one-segment partial reception service for mobile phones and mobile terminals" (One Seg broadcasting), which uses one segment, which is primarily intended for mobile receivers.

[0065] Meanwhile, in Japan, studies have begun on upgrading the next generation of terrestrial digital television broadcasting. The current ISDB-T system uses Frequency Division Multiplexing (FDM) as the method for multiplexing broadcast signals.

[0066] For the next generation of terrestrial digital television broadcasting, several broadcasting systems using multiplexing methods, such as Frequency Division Multiplexing (FDM), Time Division Multiplexing (TDM), and Layered Division Multiplexing (LDM), are being considered.

[0067] However, at present, the technical methods for realizing multiple multiplexing methods using the same broadcasting system have not been established, and there has been a demand for proposals to enable more flexible operation when multiple multiplexing methods are realized in the same broadcasting system.

[0068] In order to meet these demands, this technology proposes the following three solutions.

[0069] First, when multiple multiplexing methods (FDM, TDM, LDM) are realized in the same broadcasting system, there was a problem that it was not possible to distinguish the multiplexing method, but this problem is solved by the first solution method.

[0070] That is, in the first solution, in the physical layer frame, a common frame synchronization symbol (FSS: Frame Sync Symbol) is used with different synchronization patterns, or a common frame synchronization symbol (FSS) with the same synchronization pattern is used, but by using P1 signaling information in the P1 symbol (Preamble 1 Symbol), it is possible to distinguish the multiplexing method.

[0071] In the following description, the first solution method will be referred to as a synchronization pattern solution method, and the latter as a P1 signaling solution method.

[0072] Secondly, when a frequency division multiplexing (FDM) method such as the current ISDB-T is adopted, L1 signaling such as TMCC (Transmission Multiplexing Configuration Control) information is distributed in the physical layer frame, which causes a problem that the receiving device 30 always requires one frame to achieve synchronization. However, this problem is solved by the second solution method.

[0073] That is, in the second solution method, L1 signaling is concentrated at the beginning of a physical layer frame, thereby enabling the receiving device 30 to quickly acquire the L1 signaling and shorten the time required to achieve synchronization.

[0074] Thirdly, with current technology, it is possible to convert the payload of a physical layer frame into frequency division multiplexing (FDM) or hierarchical division multiplexing (LDM) by applying FDM or LDM, but there is a problem that the frame synchronization symbol (FSS) and preamble cannot be converted into FDM or LDM. This problem is to be solved by the third solution method.

[0075] That is, in the third solution method, in the case of frequency division multiplexing (FDM) or layer division multiplexing (LDM), a P2 symbol (Preamble 2 Symbol) is placed for each layer, so that the preamble can be FDM- or LDM-based.

[0076] For example, in Advanced Television Systems Committee (ATSC) 3.0, which is one of the broadcasting standards for next-generation terrestrial digital television broadcasting, the payload of a physical layer frame can be converted into FDM or LDM.

[0077] In this way, the above three solutions (technical features) of this technology enable more flexible operation when implementing multiple multiplexing methods (FDM, TDM, LDM) in the same broadcasting system.

[0078] The solution (technical features) of the present technology will be described below with reference to specific embodiments. However, in the following description, the configuration of the physical layer frame will be described first, and then the three solution methods will be described.

[0079] <3.Frame composition>

[0080] (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.

[0081] A physical layer frame to which this technology is applied consists of one Frame Sync Symbol (FSS), one or more P1 symbols (P1: Preamble 1 Symbol(s)), one or more P2 symbols (P2: Preamble 2 Symbol(s)), and one or more data symbols.

[0082] The Frame Synchronization Symbol (FSS) is inserted at the beginning of the physical layer frame and can be constructed robustly.

[0083] The P1 symbol (P1) is a first preamble (Preamble 1), and the P2 symbol (P2) is a second preamble (Preamble 2).

[0084] Here, for example, the frame synchronization symbol (FSS) and the P1 symbol (P1) correspond to the bootstrap that constitutes the physical layer frame defined in ATSC3.0, and the P2 symbol (P2) corresponds to the preamble (for example, see Non-Patent Document 2 below).

[0085] Non-patent document 2: ATSC Standard: A / 321, System Discovery and Signaling

[0086] The P1 symbol (P1) and the P2 symbol (P2) include physical layer signaling (L1 signaling). Herein, the signaling of the P1 symbol (P1) is referred to as P1 signaling, and the signaling of the P2 symbol (P2) is referred to as P2 signaling.

[0087] In addition, P2 signaling can be divided into a fixed-length part, L1-Basic (hereinafter, also referred to as L1B signaling), and a variable-length part, L1-Detail (hereinafter, also referred to as L1D signaling). Details of P1 signaling and P2 signaling will be described later.

[0088] Data is composed of a plurality of data symbols. Note that boundary symbols (BS) indicating frame boundaries are placed in the data as necessary.

[0089] The physical layer frame to which the present technology is applied can be configured as described above.

[0090] In the physical layer frame shown in Fig. 4, for example, the frame synchronization symbol (FSS) and the P1 symbol (P1) may be symbols (similar symbols) disclosed in the above Non-Patent Document 2, and the P2 symbol (P2) and data (data symbol) may be OFDM symbols. Here, in OFDM (Orthogonal Frequency Division Multiplexing), a large number of orthogonal subcarriers are provided within a transmission band, and digital modulation is performed.

[0091] The concept of the physical layer frame configuration shown in Fig. 4 is the same regardless of whether a time division multiplexing (TDM), frequency division multiplexing (FDM), or hierarchical division multiplexing (LDM) multiplexing method is adopted. Details of the physical layer frame configuration will be described below for each of these multiplexing methods.

[0092] (1) Physical layer frame structure of time division multiplexing (TDM)

[0093] (First configuration example) FIG. 5 is a diagram showing a first example of a configuration of a physical layer frame in the case of time division multiplexing (TDM).

[0094] Time division multiplexing (TDM) is a multiplexing method that arranges multiple broadcast signals in time so that they can be transmitted over a single transmission path.

[0095] Figure 5 shows the structure of a physical layer frame when time division multiplexing (TDM) is used, with the direction from left to right in the figure being the direction of frequency (Freq) and the direction from top to bottom in the figure being the direction of time (Time).

[0096] In Fig. 5, the 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 explained as a representative of the multiple physical layer frames transmitted in time series.

[0097] 5 is composed of a frame synchronization symbol (FSS), a P1 symbol (P1), a P2 symbol (P2), a frame (Frame), and a boundary symbol (BS). In the physical layer frame n, after acquiring the P1 symbol and the P2 symbol (the L1 signaling), it is possible to acquire the subsequent frame.

[0098] 5, a frame (Frame) as a data symbol and a boundary symbol (BS) correspond to data (Data). Here, the boundary symbol represents a symbol inserted at the end of the frame.

[0099] In Figure 5, the configuration of physical layer frame n has been explained as a representative example of multiple physical layer frames, but other physical layer frames such as physical layer frame n+1 are also configured in the same way and are transmitted in chronological order.

[0100] (Second configuration example) FIG. 6 is a diagram showing a second example of the configuration of a physical layer frame in the case of time division multiplexing (TDM).

[0101] 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). Two subframes, subframe n (SubFrame n) and subframe n+1 (SubFrame n+1), are arranged in physical layer frame n in Fig. 6.

[0102] In physical layer frame n in FIG. 6, after acquiring the P1 symbol and P2 symbol (their L1 signaling), it is possible to acquire the subsequent subframe n and subframe n+1.

[0103] Here, when two or more subframes are arranged in the physical layer frame n in FIG. 6, modulation parameters such as the FFT size, guard interval length, pilot pattern, etc., can be changed for each subframe.

[0104] In addition, a subframe boundary symbol representing a symbol to be inserted at the beginning and end of each subframe is inserted into the subframe. In the physical layer frame n, the subframe as a data symbol and the subframe boundary symbol correspond to data.

[0105] When time division multiplexing (TDM) is used, the physical layer frame can be configured as described above.

[0106] (2) Physical layer frame structure of frequency division multiplexing (FDM)

[0107] (Frame configuration example) FIG. 7 is a diagram showing an example of a configuration of a physical layer frame in the case of frequency division multiplexing (FDM).

[0108] Frequency division multiplexing (FDM) is a multiplexing method that divides the frequency band that transmits multiple broadcast signals so that they can be transmitted over a single transmission path.

[0109] Figure 7 shows the structure of a physical layer frame when using frequency division multiplexing (FDM), with the direction from left to right in the figure being the direction of frequency (Freq) and the direction from top to bottom in the figure being the direction of time (Time).

[0110] In FIG. 7, the physical layer frames are transmitted in time series, with a frame synchronization symbol (FSS) inserted at the beginning of each physical layer frame, followed by a P1 symbol (P1).

[0111] Furthermore, when using frequency division multiplexing (FDM), a given frequency band (e.g., 6 MHz) is frequency-divided into multiple segments. One or multiple segments are then combined to form a layer. For example, in FIG. 7, the frequency is divided into 35 segments, with the central 9 segments forming Layer A, and the remaining segments on the left and right forming Layer B.

[0112] In the physical layer frame n in FIG. 7, a P2 symbol (P2), a frame (Frame) as a data symbol, and a boundary symbol (BS) are arranged for each of the layers A and B.

[0113] Here, Fig. 8 shows the details of the configuration of the physical layer frame in Fig. 7. In Fig. 8, the P2 symbols, data symbols, and boundary symbols for each layer, layer A and layer B, are shown in segment units represented by squares in the figure.

[0114] That is, in Fig. 8, when the frequency is divided into 35 segments by using frequency division multiplexing (FDM), for example, the central layer A is composed of 9 segments, and the left and right layers B are composed of the remaining 26 segments. Note that each segment represented by a square in the figure is composed of the same number of subcarriers.

[0115] When frequency division multiplexing (FDM) is used, the physical layer frame can be configured as described above.

[0116] (3) Physical layer frame structure of hierarchical division multiplexing (LDM)

[0117] (Frame configuration example) FIG. 9 is a diagram showing an example of the configuration of a physical layer frame in the case of layer division multiplexing (LDM).

[0118] Hierarchical division multiplexing (LDM) is a multiplexing method that divides multiple broadcast signals into different hierarchical powers so that they can be transmitted over a single transmission path.

[0119] In Fig. 9, the configuration of a physical layer frame when using hierarchical division multiplexing (LDM) is shown in three dimensions of xyz. However, in Fig. 9, the x direction in the figure is the direction of power, the y direction in the figure is the direction of frequency (Freq), and the z direction in the figure is the direction of time (Time).

[0120] In FIG. 9, the physical layer frames are transmitted in time series, with a frame synchronization symbol (FSS) inserted at the beginning of each physical layer frame, followed by a P1 symbol (P1).

[0121] Furthermore, when layer division multiplexing (LDM) is used, a P2 symbol (P2), a frame (Frame) as a data symbol, and a boundary symbol (BS) are arranged for each layer with a different transmission power. For example, in the physical layer frame n in FIG. 9, a P2 symbol, a data symbol, and a boundary symbol are arranged for each of the two layers, layer k and layer k+1.

[0122] When layer division multiplexing (LDM) is used, the physical layer frame can be configured as described above.

[0123] In the description of this specification, the same term "layer" is used for frequency division multiplexing (FDM) and layer division multiplexing (LDM), but the meanings of these "layers" are technically different. Here, in the description of this specification, when it is clear which method a layer is referring to, the term "layer" is used without any particular distinction. On the other hand, when it is necessary to particularly distinguish between the terms "layer," a layer in frequency division multiplexing (FDM) will be described as an "FDM layer," and a layer in layer division multiplexing (LDM) will be described as an "LDM layer."

[0124] (4) Frame Synchronization Symbol (FSS) and P1 Symbol (P1) Structure

[0125] Next, the configuration of the frame synchronization symbol (FSS) and the P1 symbol (P1) in the physical layer frame will be described with reference to Figs.

[0126] (Current configuration of FSS and P1) FIG. 10 is a diagram showing the current configuration of a frame synchronization symbol (FSS) and a P1 symbol (P1).

[0127] The CAB structure and BCA structure shown in Fig. 10 correspond to the Bootstrap configuration defined in ATSC3.0 (for example, see Non-Patent Document 2 above). Here, the frame synchronization symbol (FSS) has a CAB structure, while the P1 symbol (P1) has a BCA structure. That is, ATSC3.0 specifies that one physical layer frame includes one frame synchronization symbol (FSS) and three P1 symbols (P1).

[0128] 10, the sample in part C is 520, the sample in part A is 2048, and the sample in part B is 504. Similarly, in the BCA structure of the P1 symbol (P1) in FIG.

[0129] (FSS and P1 configuration of this technology) FIG. 11 is a diagram showing an outline of the configuration of a frame synchronization symbol (FSS) and a P1 symbol (P1) according to the present technology.

[0130] 11, in the CAB structure of the frame synchronization symbol (FSS), when the samples of the C, A, and B parts are 520g, 2048g, and 504g, respectively, in the configuration of the present technology, g is mainly set to 0.5. On the other hand, in the BCA structure of the P1 symbol (P1), when the samples of the B, C, and A parts are 504g, 520g, and 2048g, respectively, in the configuration of the present technology, g is mainly set to 0.5.

[0131] That is, by setting g = 0.5, the symbol lengths of the frame synchronization symbol (FSS) and the P1 symbol (P1) can be halved, thereby achieving high efficiency in the physical layer frame.

[0132] Specifically, in the CAB structure of the frame synchronization symbol (FSS), the samples in the C portion can be 260, the samples in the A portion can be 1024, and the samples in the B portion can be 252. Similarly, in the BCA structure of the P1 symbol (P1), the samples in the B portion can be 252, the samples in the C portion can be 260, and the samples in the A portion can be 1024.

[0133] In addition, in the configuration of this technology, the number of P1 symbols is reduced from three to two compared to the configuration of ATSC3.0, so that one physical layer frame includes one frame synchronization symbol (FSS) and two P1 symbols (P1). In other words, the configuration of this technology is three-quarters as efficient as the configuration of ATSC3.0.

[0134] In FIG. 12, the upper part shows the ATSC3.0 configuration as the configuration of the frame synchronization symbol (FSS) and the P1 symbol (P1), while the lower part shows the configuration of the present technology.

[0135] In Fig. 12, in the configuration of this technology in the lower part, compared to the ATSC3.0 configuration in the upper part, the symbol lengths of the frame synchronization symbol (FSS) and P1 symbol (P1) are halved, and the number of P1 symbols is reduced from 3 to 2. Therefore, the configuration of this technology in the lower part can shorten the transmission time to 3 / 8 (1 / 2 × 3 / 4) the time compared to the ATSC3.0 configuration in the upper part.

[0136] FIG. 13 shows the relationship between the value of g and the FFT size, samples, maximum transmission rate (Max bps), and robust transmission rate (Robust bps).

[0137] In Fig. 13, the values ​​of the FFT size, samples, maximum transmission rate, and robust transmission rate increase or decrease according to the value of g. As described above, in the configuration of the present technology, by setting g = 0.5, FTT size = 1024, samples = 1536, maximum transmission rate = 10 bps, and robust transmission rate = 6 bps or 7 bps, it is possible to improve efficiency compared to the configuration of ATSC3.0 (g = 1.0).

[0138] Although a maximum robust transmission speed of 10 bps is theoretically possible, correlation may not be sufficient due to channel noise, etc., so in practice, operation is performed at 3 bps or 4 bps with back-off. In the ATSC3.0 configuration, the maximum speed is theoretically 11 bps, but in practice, operation is performed at 8 bps. On the other hand, in the configuration of the present technology, operation can be performed at, for example, 6 bps, although the maximum speed is theoretically 10 bps.

[0139] Furthermore, in order to prove that g=0.5 is suitable as the value of g, the inventor of the present technology performed a simulation to obtain SNR (Symbol to Noise Ratio) for each FFT size shown in Fig. 13. The simulation results are shown in Figs. 14 to 18.

[0140] In this simulation, it is assumed that the receiving device 30 receives the entire frequency band (e.g., 6 MHz) allocated to the channel. In addition, in Fig. 14 to Fig. 18, the horizontal axis represents SNR (Symbol to Noise Ratio) and the vertical axis represents BLER (Block Error Rate).

[0141] In addition, in Fig. 14 to Fig. 18, the a in [a, b, c] shown in different line types as a result of simulation represents the number of bits of the frame synchronization symbol (FSS), and the other characters such as b and c represent the number of bits of the P1 symbol (P1). The frame synchronization symbol (FSS) has no information, so it is all set to 0 bits. Also, the number of bits of the P1 symbol (P1) is 2 to 12 bits, etc.

[0142] Fig. 14 shows a simulation result in the case where the FFT size is 512. In the simulation result in Fig. 14, when the BLER is 1.0×10-3 (1.0E-03), the SNR is -6 dB.

[0143] Fig. 15 shows a simulation result in the case where the FFT size is 1024. In the simulation result in Fig. 15, when the BLER is 1.0×10-3 (1.0E-03), the SNR is -7.6 dB.

[0144] Fig. 16 shows a simulation result in the case where the FFT size is 2048. In the simulation result in Fig. 16, when the BLER is 1.0×10-3 (1.0E-03), the SNR is -9.6 dB.

[0145] Fig. 17 shows a simulation result in the case where the FFT size is 4096. In the simulation result in Fig. 17, when the BLER is 1.0×10-3 (1.0E-03), the SNR is -10.8 dB.

[0146] Fig. 18 shows a simulation result in the case where the FFT size is 8192. In the simulation result in Fig. 18, when the BLER is 1.0×10-3 (1.0E-03), the SNR is -12.5 dB.

[0147] Here, the ATSC3.0 configuration corresponds to the simulation result (FIG. 16) when g = 1.0, i.e., FFT size = 2048, so the SNR is -9.6 dB. On the other hand, the configuration of the present technology corresponds to the simulation result (FIG. 15) when g = 0.5, i.e., FFT size = 1024, so the SNR is -7.6 dB.

[0148] As for the SNR, normally, about -7.6 dB is a sufficient value, and -9.6 dB is not necessary. In other words, g = 1.0 used in the configuration of ATSC3.0 is over-specified, and sufficient performance can be obtained with g = 0.5. Therefore, in the configuration of this technology, g = 0.5 is considered to be preferable.

[0149] Although it has been described here that g = 0.5 is preferable from the viewpoint of shortening transmission time, in the configuration of the physical layer frame of the present technology, the value of g may be other than 0.5, such as g = 0.25, 1.00, 2.00, or 4.00.

[0150] Furthermore, 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 (e.g., 6 MHz) assigned to a channel is frequency-divided into a plurality of segments.

[0151] In the example of Fig. 19, when the horizontal direction is frequency, the rectangular segments in the frequency band (e.g. 6 MHz) between the upper and lower frequency limits form a hierarchy (FDM hierarchy). In Fig. 19, the frequency is divided into 35 segments.

[0152] Here, of the 35 segments, the central segment in the figure is designated segment #0, the segments to the left and right of that are designated segments #1 and #2, and the segments to the left and right of that are designated segments #3 and #4. If this is repeated, the leftmost segment in the figure (lower frequency limit side) will be segment #33, and the rightmost segment in the figure (upper frequency limit side) will be segment #34.

[0153] Moreover, layers are formed by combining one or more segments. In Fig. 19, Layer A is formed by nine segments, segments #0 to #8. Layer B is formed by a total of 26 segments, including 13 segments, segments #10, #12, ..., #32, #34, and 13 segments, segments #9, #11, ..., #31, #33.

[0154] In this way, a hierarchy is composed of one or more segments, and for example, data of a different broadcast service can be transmitted for each hierarchy. For example, when receiving data of a broadcast service transmitted in hierarchy A, the receiving device 30 receives only the frequency band of hierarchy A by a partial band filter (FIG. 19).

[0155] That is, in the receiving device 30, of the entire frequency band allocated to the channel, only the partial band corresponding to the hierarchy A is received, and the frame synchronization symbol (FSS) and the P1 symbol (P1) are received in the partial band. In other words, the partial band corresponding to the hierarchy A is set to 9 / 35 of the entire frequency band.

[0156] Here, the inventor of the present technology performed a simulation to obtain an SNR when the FFT size is 1024 in order to prove that g = 0.5 is suitable as the value of g even when the partial band corresponding to layer A is 9 / 35 of the full band (approximately 1 / 4 of the full band). The simulation result is shown in FIG.

[0157] In Fig. 20, the horizontal axis represents SNR and the vertical axis represents BLER, similarly to Fig. 14 to Fig. 18. Also, Fig. 20 shows five patterns of simulation results. That is, a, b, and c of [a, b, c] represented by different line types represent 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), respectively.

[0158] The frame synchronization symbol (FSS) has no information, so it is all 0 bits. The number of bits in the P1 symbol (P1) is 4 to 7 bits. That is, for example, [0,5,5] is 0 bit FSS, 5 bits P1, and 5 bits P1, totaling 10 bits of information. 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, and [0,7,7] is 14 bits of information.

[0159] In the simulation results of Fig. 20, when BLER = 1.0 x 10-3 (1.0E-03), SNR = -4 dB is obtained. That is, when comparing the partial band (9 / 35 band) simulation result (Fig. 20) with the above-mentioned full band simulation result (Fig. 15) for g = 0.5, the SNR when BLER = 1.0 x 10-3 (1.0E-03) is reduced from -7.6 dB to about -4 dB.

[0160] However, an SNR of about -4 dB is usually within the acceptable range and sufficient performance can be obtained. Therefore, even if the partial band corresponding to layer A is set to 9 / 35 of the full band, it can be said that g = 0.5 is suitable as the value of g.

[0161] Based on the above-mentioned various simulation results, taking robustness into consideration, one symbol can be 6 bits. However, in practice, by having a 4-bit backoff, it is possible to operate with 6 bits, with a maximum of 10 bits.

[0162] On the other hand, when considering 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 transmit information with a 12-bit (6 bits x 2) P1 symbol. The structure of such a P1 symbol is shown in Figure 21.

[0163] That is, in Fig. 21, one physical layer frame is configured to include one frame synchronization symbol (FSS) and two P1 symbols. As described above, it is preferable to use two P1 symbols not only from the viewpoint of efficiency but also from the viewpoint of the number of bits per symbol. Note that Fig. 21 shows a configuration with FFT size = 1024 (1K) and a configuration with FFT size = 2048 (2K), but as mentioned above, sufficient performance can be obtained with the configuration with FFT size = 1024.

[0164] The above can be summarized as shown in Figure 22. Figure 22 shows the relationship between FFT size, samples per symbol (Samples Per sym), maximum transmission speed (Max bps), robust transmission speed (Robust bps), number of symbols (#Syms), maximum number of bits (Maxbits), and total samples (Total Samples).

[0165] That is, in the configuration of the present technology, a value of g of 0.5 is suitable, and the following can be set: FFT size = 1024, samples per symbol = 1536, maximum transmission speed = 10 bps, robust transmission speed = 6 bps, number of symbols = 3, maximum number of bits = 12 bits (6 bits x 2), total number of samples = 4608 (1536 x 3).

[0166] As shown in Fig. 12, etc., the number of samples per symbol is 1536 by halving the symbol lengths of the frame synchronization symbol (FSS) and P1 symbol (P1) with g = 0.5. Also, the number of symbols is three by having one frame synchronization symbol (FSS) and two P1 symbols (P1) in one physical layer frame, as shown in Fig. 12, etc. Furthermore, the maximum number of bits is set to 12 bits because, when one symbol is 6 bits, two P1 symbols will have 12 bits, taking into account the information to be sent from the transmitting side to the receiving side.

[0167] Also, for example, if the sampling frequency is 6.912 MHz, and the FFT size is 1024 (1K), the time per symbol is 0.222 ms, so for three symbols it is 0.666 ms. On the other hand, if the FFT size is 2048 (1K), then if the sampling frequency is 6.912 MHz, it is 1.33 ms. Note that although 6.912 MHz is used as the sampling frequency here, other sampling frequencies may be used.

[0168] (5) P2 symbol (P2) configuration

[0169] Next, the configuration of the P2 symbol of the physical layer frame will be described with reference to Fig. 23 to Fig. 27. Note that the configuration of the P2 symbol differs depending on the multiplexing method, so the configuration of the P2 symbol will be described below in the order of time division multiplexing (TDM), frequency division multiplexing (FDM), and hierarchical division multiplexing (LDM).

[0170] (Example of configuration for TDM) FIG. 23 is a diagram showing an example of a P2 symbol configuration in the case of time division multiplexing (TDM).

[0171] 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 in one physical layer frame.

[0172] 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). Data (Payload Data) is placed in the remaining part of the P2 symbol.

[0173] 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-Detail). Since the variable-length L1D signaling does not fit within the first P2 symbol, the remaining part of the L1D signaling is arranged in the second P2 symbol. Data (Payload Data) is arranged in the remaining part of the second P2 symbol.

[0174] In addition, in a configuration in which one or more subframes are arranged in a physical layer frame as shown in Figure 6, all L1 signaling (including L1B signaling and L1D signaling) is arranged before the first subframe.

[0175] (First configuration example for FDM) FIG. 24 is a diagram showing a first example of a configuration of a P2 symbol in the case of frequency division multiplexing (FDM).

[0176] Here, Figure 24 shows the cases where one P2 symbol is placed in one physical layer frame and the cases where two P2 symbols are placed in one physical layer frame when layers A and B are constructed using frequency division multiplexing (FDM).

[0177] When one P2 symbol is arranged, fixed-length L1B signaling (L1-Basic) is arranged from the beginning of the part corresponding to layer A in the P2 symbol, followed by variable-length L1D signaling (L1-Detail). In addition, data (Payload Data) is arranged in the remaining part of the part corresponding to layer A in the P2 symbol.

[0178] That is, when one P2 symbol is arranged and composed of multiple layers, L1B signaling and L1D signaling are included only in layer A that includes the central segment. Note that in the P2 symbol, only data (Payload Data) is arranged in layer B on the left and right.

[0179] On the other hand, when two P2 symbols are placed, in the first P2 symbol, fixed-length L1B signaling (L1-Basic) is placed from the beginning of the part corresponding to layer A, followed by variable-length L1D signaling (L1-Detail).

[0180] In this case, since the variable length L1D signaling does not fit into the portion of the first P2 symbol that corresponds to layer A, the remaining portion of the L1D signaling is placed in the portion of the second P2 symbol that corresponds to layer A. Moreover, in the second P2 symbol, data (Payload Data) is placed in the remaining portion of the portion that corresponds to layer A.

[0181] That is, when two P2 symbols are arranged and multiple layers are configured, L1B signaling and L1D signaling are included only 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.

[0182] In this way, when multiple layers are configured using frequency division multiplexing (FDM), L1B signaling is placed in the portion of the P2 symbol that corresponds to layer A, and L1D signaling is placed in the remaining portion of that portion that corresponds to layer A. In this case, if the L1D signaling does not fit into the portion of the first P2 symbol that corresponds to layer A, the remaining portion of the L1D signaling is placed in the portion of the second P2 symbol that corresponds to layer A.

[0183] As a result, all L1 signaling (L1B signaling and L1D signaling) is included in the P2 symbol of hierarchy A, which includes the central segment, so that the receiving device 30 can acquire L1 signaling not only when receiving the entire frequency band (e.g., 6 MHz) assigned to the channel, but also when receiving only a partial band corresponding to hierarchy A (e.g., 9 / 35 of the entire band).

[0184] (Second configuration example for FDM) FIG. 25 is a diagram showing a second configuration example of the P2 symbol in the case of frequency division multiplexing (FDM).

[0185] FIG. 25, like FIG. 24, shows the cases where one P2 symbol is arranged and two P2 symbols are arranged in one physical layer frame when layers A and B are configured.

[0186] When one P2 symbol is arranged, fixed-length L1B signaling (L1-Basic) is arranged from the beginning of the part corresponding to layer A in the P2 symbol, followed by variable-length L1D signaling (L1-Detail). In addition, data (Payload Data) is arranged in the remaining part of the part corresponding to layer A in the P2 symbol.

[0187] In addition, in the P2 symbol, variable length L1D signaling (L1-Detail) is placed from the beginning of the portion corresponding to one layer B (layer B on the left side), followed by data (Payload Data). However, this L1D signaling includes only information related to layer B. Note that in the P2 symbol, only data (Payload Data) is placed in the portion corresponding to the other layer B (layer B on the right side).

[0188] On the other hand, when two P2 symbols are placed, in the first P2 symbol, fixed-length L1B signaling (L1-Basic) is placed from the beginning of the part corresponding to layer A, followed by variable-length L1D signaling (L1-Detail).

[0189] In this case, since the variable length L1D signaling does not fit into the portion of the first P2 symbol that corresponds to layer A, the remaining portion of the L1D signaling is placed in the portion of the second P2 symbol that corresponds to layer A. Moreover, in the second P2 symbol, data (Payload Data) is placed in the remaining portion of the portion that corresponds to layer A.

[0190] In addition, in the first P2 symbol, variable length L1D signaling (L1-Detail) is placed from the beginning of the portion corresponding to one layer B (layer B on the left), followed by data (Payload Data). However, this L1D signaling includes only information related to layer B. Note that in the first P2 symbol, only data (Payload Data) is placed in the portion corresponding to the other layer B (layer B on the right).

[0191] In this way, when multiple layers are configured using frequency division multiplexing (FDM), L1B signaling is placed in the portion of the P2 symbol that corresponds to layer A, and L1D signaling is placed in the remaining portion of that portion that corresponds to layer A. In this case, if the L1D signaling does not fit into the portion of the first P2 symbol that corresponds to layer A, the remaining portion of the L1D signaling is placed in the portion of the second P2 symbol that corresponds to layer A. Furthermore, information related to layer B in the L1D signaling is placed in the portion of the P2 symbol that corresponds to layer B.

[0192] In addition, although FIG. 25 illustrates an example in which one P2 symbol is arranged and an example in which two P2 symbols are arranged, it is assumed that basically, in most cases, one P2 symbol is arranged. That is, by arranging information related to layer B of the L1D signaling in the part of the P2 symbol corresponding to layer B, it is possible to reduce the amount of L1D signaling information arranged in the part of the P2 symbol corresponding to layer A. Therefore, by simply arranging one P2 symbol, it is possible to secure an area for arranging all the information of the L1D signaling.

[0193] In addition, since reception device 30 basically performs processing in units of one symbol, when obtaining L1 signaling from two P2 symbols, it is necessary to buffer and hold the earlier P2 symbol until the later P2 symbol is processed. On the other hand, when 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.

[0194] (First configuration example for LDM) FIG. 26 is a diagram showing a first configuration example of a P2 symbol in the case of layered division multiplexing (LDM).

[0195] Here, Figure 26 shows the cases where one P2 symbol is placed in one physical layer frame and the cases where two P2 symbols are placed in one physical layer frame when layer k and layer k+1 are constructed using layer division multiplexing (LDM).

[0196] 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). Data (Payload Data) is arranged in the remaining part of the P2 symbol of layer k. Note that only data (Payload Data) is arranged in the P2 symbol of layer k+1.

[0197] On the other hand, when two P2 symbols are placed, in layer k, the first P2 symbol has fixed-length L1B signaling (L1-Basic) placed at the beginning, followed by variable-length L1D signaling (L1-Detail).

[0198] Here, in layer k, since the variable length L1D signaling does not fit within the first P2 symbol, it is placed in the second P2 symbol. Also, in layer k, data (Payload Data) is placed in the remaining portion of the second P2 symbol.

[0199] Furthermore, in layer k+1, only data (payload data) is allocated to the first P2 symbol and the second P2 symbol.

[0200] In this way, when multiple layers are configured by layer division multiplexing (LDM), L1B signaling is placed in the P2 symbol of layer k, and L1D signaling is placed in the remaining part of the P2 symbol of layer k. In this case, if the L1D signaling does not fit within the first P2 symbol in layer k, the remaining part of the L1D signaling is placed in the second P2 symbol.

[0201] (Second configuration example for LDM) FIG. 27 is a diagram showing a second configuration example of the P2 symbol in the case of layered division multiplexing (LDM).

[0202] Like Figure 26, Figure 27 shows the cases where one P2 symbol is placed in one physical layer frame and the cases where two P2 symbols are placed in one physical layer frame when layer k and layer k+1 are configured.

[0203] 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). Data (Payload Data) is arranged in the remaining part of the P2 symbol of layer k.

[0204] In addition, in the P2 symbol of 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 related to layer k+1.

[0205] On the other hand, when two P2 symbols are placed, in layer k, the first P2 symbol has fixed-length L1B signaling (L1-Basic) placed at the beginning, followed by variable-length L1D signaling (L1-Detail).

[0206] Here, in layer k, since the variable length L1D signaling does not fit within the first P2 symbol, it is placed in the second P2 symbol. Also, in layer k, data (Payload Data) is placed in the remaining portion of the second P2 symbol.

[0207] Also, in the first P2 symbol in layer k+1, variable length L1D signaling (L1-Detail) is placed from the beginning, followed by data (Payload Data). However, this L1D signaling includes only information related to layer k+1. In addition, in the second P2 symbol in layer k+1, only data (Payload Data) is placed.

[0208] 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 L1D signaling is placed in the remaining part of the P2 symbol of layer k. At that time, if the L1D signaling does not fit within the first P2 symbol in layer k, the remaining part of the L1D signaling is placed in the second P2 symbol. Furthermore, information related to layer k+1 in the L1D signaling is placed in the P2 symbol of layer k+1.

[0209] The configuration of the physical layer frame to which the present technology is applied has been described above.

[0210] <4. First solution>

[0211] As described above, currently, when multiple multiplexing methods (FDM, TDM, LDM) are implemented in the same broadcasting system, there is a problem that it is not possible to distinguish the multiplexing method. However, this technology solves this problem by the first solution method.

[0212] However, there are two first solution methods: a synchronization pattern solution method and a P1 signaling solution method, and they will be explained in that order below.

[0213] (1) Synchronization pattern resolution method

[0214] First, the synchronization pattern solving method will be described with reference to FIGS.

[0215] The synchronization pattern resolution method is a method for distinguishing between multiple multiplexing methods (FDM, TDM, LDM) by using different synchronization patterns with a common frame synchronization symbol (FSS).

[0216] (Example of a synchronization pattern) FIG. 28 is a diagram showing an example of a synchronization pattern of a frame synchronization symbol (FSS).

[0217] In Fig. 28, when the multiplexing method is frequency division multiplexing (FDM), "0x019D" is used as the synchronization pattern of the frame synchronization symbol (FSS). When the multiplexing method is time division multiplexing (TDM), "0x00ED" is used as the synchronization pattern of the frame synchronization symbol (FSS), and when the multiplexing method is hierarchical division multiplexing (LDM), "0x01E8" is used as the synchronization pattern of the frame synchronization symbol (FSS). In other words, the synchronization pattern is the discrimination information of the multiplexing method.

[0218] As described above, since the synchronization pattern of the frame synchronization symbol (FSS) in the physical layer frame differs for each multiplexing method, the receiving device 30 can determine the multiplexing method, which is frequency division multiplexing (FDM), time division multiplexing (TDM), or hierarchical division multiplexing (LDM), based on this synchronization pattern ("0x019D", "0x00ED", "0x01E8").

[0219] Also, the synchronization pattern of the frame synchronization symbol (FSS) is shown here on the assumption that the Zadoff-Chu sequence root q is 137, but the value of q may be other values, such as q = 400. However, when the value of q is other values, the synchronization pattern of the frame synchronization symbol (FSS) will be different from the synchronization pattern shown in FIG.

[0220] The Zadoff-Chu sequence route q is also described in the above-mentioned Non-Patent Document 2 and the like.

[0221] In this way, the synchronization pattern solving method provides a synchronization pattern of the frame synchronization symbol (FSS) for each multiplexing method, and therefore can support a large number of multiplexing methods. Other multiplexing methods include, for example, hierarchical time division multiplexing (LDM_TDM) and hierarchical frequency division multiplexing (LDM_FDM). The synchronization pattern solving method also has the advantage that it does not require the use of the P1 symbol bits.

[0222] Next, the configuration of P1 signaling when the synchronization pattern solving method is used will be described. Since the configuration of P1 signaling differs depending on the multiplexing method, the configurations of P1 signaling will be described below in the order of time division multiplexing (TDM), frequency division multiplexing (FDM), and hierarchical division multiplexing (LDM).

[0223] (1a) Time division multiplexing (TDM)

[0224] (Example of P1 signaling) FIG. 29 is a diagram showing an example of the syntax of P1 signaling in the case of time division multiplexing (TDM).

[0225] In Figure 29, P1 signaling includes P1_P2_waveform_structure, P1_eas_wake_up, P1_band_width, and P1_Reserved.

[0226] The 7-bit P1_P2_waveform_structure indicates the structure of the P1 and P2 symbols. This P1_P2_waveform_structure includes information that combines an FFT size, a GI (Guard Interval), an FEC (Forward Error Correction) type, and a pilot pattern (SPP: SP pattern).

[0227] The 1-bit P1_eas_wake_up represents an emergency alert flag.

[0228] The 2-bit P1_band_width indicates the bandwidth of the broadcast signal.

[0229] The 2-bit P1_Reserved represents an area for future expansion.

[0230] If uimsbf (unsigned integer most significant bit first) is specified as the format, it means that the value will be treated as an integer after bitwise arithmetic. This format is also the same for other syntaxes described later.

[0231] (Example of P1_P2_waveform_structure) FIG. 30 is a diagram showing an example of the P1_P2_waveform_structure of FIG.

[0232] When "0000000" is specified as the value of P1_P2_waveform_structure, the FFT size is 8K, GI is 256, FEC type is 1, and pilot pattern is 16_2.

[0233] When "0000001" is specified as the value of P1_P2_waveform_structure, the FFT size is 8K, GI is 256, FEC type is 1, and pilot pattern is 16_4.

[0234] When "0000010" is specified as the value of P1_P2_waveform_structure, the FFT size is 8K, GI is 512, FEC type is 1, and pilot pattern is 12_2.

[0235] In the example of Fig. 30, all values ​​of P1_P2_waveform_structure are not listed, but the same combination of FFT size, GI, FEC type, and pilot pattern is assigned to the other values ​​of P1_P2_waveform_structure. For example, when "1000010" is specified as the value of P1_P2_waveform_structure, FFT size = 32K, GI = 2048, FEC type = 2, and pilot pattern = 6_2.

[0236] However, it is not necessary to list all combinations in P1_P2_waveform_structure, and it is sufficient to define only combinations used in actual operation. For example, in the example of Fig. 30, as described later, there are 34 combinations of FFT size, GI, and pilot pattern, but it is not necessary to apply them to all FEC types.

[0237] Also, the FFT size, GI, and pilot pattern may be set to one FEC type. However, when the number of parameters is small, both FEC type 1 (FEC type = 1) and FEC type 2 (FEC type = 2) can be prepared.

[0238] (1b) Frequency division multiplexing (FDM)

[0239] (Example of P1 signaling) FIG. 31 is a diagram illustrating an example of the syntax of P1 signaling in the case of frequency division multiplexing (FDM).

[0240] In Figure 31, P1 signaling includes P1_P2_waveform_structure, P1_eas_wake_up, P1_band_width, and P1_Reserved.

[0241] The 7-bit P1_P2_waveform_structure contains, as the structure of the P1 and P2 symbols, information that combines the FFT size, GI, FEC type, pilot pattern, and the number of segments in layer A. Note that layer A is the layer that contains the central segment, as shown in Figs. 7 and 8 above.

[0242] In addition, in FIG. 31, P1_eas_wake_up, P1_band_width, and P1_Reserved are the same as those shown in FIG. 29, so the description thereof will be omitted.

[0243] (Example of P1_P2_waveform_structure) FIG. 32 is a diagram showing an example of the P1_P2_waveform_structure of FIG.

[0244] When "0000000" is specified as the value of P1_P2_waveform_structure, the FFT size is 8K, GI is 256, FEC type is 1, pilot pattern is 16_2, and the number of segments in layer A is 9.

[0245] When "0000001" is specified as the value of P1_P2_waveform_structure, the FFT size is 8K, GI is 256, FEC type is 1, pilot pattern is 16_2, and the number of segments in layer A is 7.

[0246] When "0000010" is specified as the value of P1_P2_waveform_structure, the FFT size is 8K, GI is 256, FEC type is 1, pilot pattern is 16_2, and the number of segments in layer A is 3.

[0247] When "0000011" is specified as the value of P1_P2_waveform_structure, the FFT size is 8K, GI is 256, FEC type is 1, pilot pattern is 16_2, and the number of segments in layer A is 1.

[0248] When "0000100" is specified as the value of P1_P2_waveform_structure, the FFT size is 8K, GI is 256, FEC type is 1, pilot pattern is 16_4, and the number of segments in layer A is 9.

[0249] In the example of FIG. 32, all values ​​of P1_P2_waveform_structure are not listed, but similarly, combinations of FFT size, GI, FEC type, pilot pattern, and number of segments in hierarchical A are assigned to other values ​​of P1_P2_waveform_structure.

[0250] For example, when "0010010" is specified as the value of P1_P2_waveform_structure, the following are set: FFT size = 16K, GI = 1024, FEC type = 1, pilot pattern = 12_2, and number of segments in hierarchical layer A = 3. Also, when "0010011" is specified as the value of P1_P2_waveform_structure, the following are set: FFT size = 16K, GI = 1024, FEC type = 1, pilot pattern = 12_2, and number of segments in hierarchical layer A = 9.

[0251] Furthermore, for example, when "1000010" is specified as the value of P1_P2_waveform_structure, the following are set: FFT size=32K, GI=2048, FEC type=2, pilot pattern=6_2, and number of segments in layer A=9.

[0252] However, it is not necessary to list all combinations in P1_P2_waveform_structure, and it is sufficient to define only combinations used in actual operation. For example, in the example of Fig. 32, as described later, there are 34 combinations of FFT size, GI, and pilot pattern, but it is not necessary to multiply all FEC types and the number of segments in layer A. For example, if 9 segments and 3 segments are mainly used as the number of segments in layer A, it is sufficient to define only combinations related to 9 segments and 3 segments.

[0253] (1c) Layer division multiplexing method (LDM) FIG. 33 is a diagram illustrating an example of the syntax of P1 signaling in the case of layered division multiplexing (LDM).

[0254] In Figure 33, P1 signaling includes P1_P2_waveform_structure, P1_eas_wake_up, P1_band_width, and P1_Reserved.

[0255] The 7-bit P1_P2_waveform_structure contains information on the combination of the FFT size, GI, FEC type, and pilot pattern as the structure of the P1 and P2 symbols.

[0256] In addition, in FIG. 33, P1_eas_wake_up, P1_band_width, and P1_Reserved are the same as those shown in FIG. 29, so the description thereof will be omitted.

[0257] (Example of P1_P2_waveform_structure) FIG. 34 is a diagram showing an example of the P1_P2_waveform_structure of FIG.

[0258] When "0000000" is specified as the value of P1_P2_waveform_structure, the FFT size is 8K, GI is 256, FEC type is 1, and pilot pattern is 16_2.

[0259] When "0000001" is specified as the value of P1_P2_waveform_structure, the FFT size is 8K, GI is 256, FEC type is 1, and pilot pattern is 16_4.

[0260] When "0000010" is specified as the value of P1_P2_waveform_structure, the FFT size is 8K, GI is 512, FEC type is 1, and pilot pattern is 12_2.

[0261] In the example of Fig. 34, all values ​​of P1_P2_waveform_structure are not listed, but the same combination of FFT size, GI, FEC type, and pilot pattern is assigned to the other values ​​of P1_P2_waveform_structure. For example, when "1000010" is specified as the value of P1_P2_waveform_structure, FFT size = 32K, GI = 2048, FEC type = 2, and pilot pattern = 6_2.

[0262] However, it is not necessary to list all combinations in P1_P2_waveform_structure, and it is sufficient to define only combinations used in actual operation. 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 apply them to all FEC types.

[0263] Also, the FFT size, GI, and pilot pattern may be set to one FEC type. However, when the number of parameters is small, both FEC type 1 (FEC type = 1) and FEC type 2 (FEC type = 2) can be prepared.

[0264] (1d) Example of FFT, GI, PP combination and FEC type

[0265] (Example of FFT, GI, and PP combination) Here, the combination of the FFT size, GI, and pilot pattern in the above-mentioned P1_P2_waveform_structure will be described in detail.

[0266] FIG. 35 is a diagram showing examples of combinations of FFT sizes and GIs.

[0267] 35 shows the number of GI samples 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. That is, the number of GI samples is 256, 512, 1024, and 2048.

[0268] FIG. 36 is a diagram showing an example of a combination of an FFT size, a GI, and a pilot pattern.

[0269] In FIG. 36, pilot patterns corresponding to FFT sizes of 8K, 16K, and 32K are associated with each GI pattern according to the number of GI samples.

[0270] That is, GI_256 corresponds to seven pilot patterns, namely, SP16_2 and SP16_4 of 8K FFT, SP32_2, SP32_4, SP16_2 and SP16_4 of 16K FFT, and SP32_2 of 32K FFT. Also, GI3_512 corresponds to nine pilot patterns, namely, SP12_2, SP12_4, SP6_2 and SP6_4 of 8K FFT, SP24_2, SP24_4, SP12_2 and SP12_4 of 16K FFT, and SP24_2 of 32K FFT.

[0271] In addition, GI5_1024 supports ten 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. In addition, GI7_2048 supports eight pilot patterns: SP3_2, SP3_4 of 8K FFT, SP6_2, SP6_4, SP3_2, SP3_4 of 16K FFT, and SP12_2, SP6_2 of 32K FFT.

[0272] As shown in Figs. 35 and 36, there are a total of 34 combinations of FFT sizes, GIs, and pilot patterns.

[0273] (Example of FEC type) As the FEC type, FEC type 1 (FEC type = 1) and FEC type 2 (FEC type = 2) can be used.

[0274] FEC type 1 is a very robust FEC. For example, QPSK+CR = 3 / 15 can be used as the modulation method. This FEC type 1 corresponds to "L1-Basic Mode 2" of ATSC3.0. The required C / N (Carrier to Noise Ratio) is about -2.0 dB.

[0275] FEC type 2 is an FEC used when efficiency is prioritized. For example, 64QAM+CR = 3 / 15 can be used as the modulation method. This FEC type 2 corresponds to "L1-Basic Mode 5" of ATSC3.0. The required C / N is about 10dB.

[0276] Although FEC type 1 and FEC type 2 are given here as examples of FEC types, other FEC types may also be used.

[0277] (2) P1 signaling solution method

[0278] Next, the P1 signaling solution method will be described with reference to Figures 37 to 42.

[0279] The P1 signaling solution method uses a common frame synchronization symbol (FSS) and the same synchronization pattern, but distinguishes between multiple multiplexing methods (FDM, TDM, LDM) by using the P1 signaling information of the P1 symbol.

[0280] In other words, in the P1 signaling solution method, unlike the synchronization pattern solution method described above, different synchronization patterns are used in the frame synchronization symbol (FSS), but the same synchronization pattern is used to make the frame synchronization symbol (FSS) completely common.

[0281] On the other hand, the P1 signaling specifies the frequency division multiplexing (FDM), time division multiplexing (TDM), or hierarchical division multiplexing (LDM) as discrimination information for discriminating the multiplexing method. For example, this discrimination information can be defined so that "00" represents frequency division multiplexing (FDM), "01" represents time division multiplexing (TDM), and "10" represents hierarchical division multiplexing (LDM).

[0282] The receiving device 30 can determine the multiplexing method, frequency division multiplexing (FDM), time division multiplexing (TDM), or hierarchical division multiplexing (LDM), based on the discrimination information ("00", "01", "10") of the P1 signaling.

[0283] In this way, in the P1 signaling solution method, the multiplexing method is determined by the discrimination information of the P1 signaling, so that the search time can be shortened.

[0284] Next, the configuration of P1 signaling when using the P1 signaling solution method will be described. Note that the configuration of P1 signaling differs for each multiplexing method, so the configuration of P1 signaling will be described in the order of time division multiplexing (TDM), frequency division multiplexing (FDM), and hierarchical division multiplexing (LDM).

[0285] (2a) Time division multiplexing (TDM)

[0286] (Example of P1 signaling) FIG. 37 is a diagram showing an example of the syntax of P1 signaling in the case of time division multiplexing (TDM).

[0287] In Figure 37, P1 signaling includes P1_P2_waveform_structure, P1_eas_wake_up, P1_band_width, and P1_Frame_Multiplexing.

[0288] The 7-bit P1_P2_waveform_structure includes information on a combination of an FFT size, a GI, an FEC type, and a pilot pattern as a structure of P1 and P2 symbols. Note that, for example, the combination of information shown in FIG. 30 can be defined as the P1_P2_waveform_structure.

[0289] The 1-bit P1_eas_wake_up represents an emergency alert flag.

[0290] The 2-bit P1_band_width indicates the bandwidth of the broadcast signal.

[0291] The 2-bit P1_Frame_Multiplexing indicates information for identifying the multiplexing method, such as frequency division multiplexing (FDM), time division multiplexing (TDM), or hierarchical division multiplexing (LDM).

[0292] (Example of P1_Frame_Multiplexing) FIG. 38 is a diagram showing an example of P1_Frame_Multiplexing in FIG.

[0293] When "00" is specified as the value of P1_Frame_Multiplexing, this means that the multiplexing method is frequency division multiplexing (FDM).

[0294] When "01" is specified as the value of P1_Frame_Multiplexing, it means that the multiplexing method is time division multiplexing (TDM).

[0295] When "10" is specified as the value of P1_Frame_Multiplexing, it means that the multiplexing method is hierarchical division multiplexing (LDM).

[0296] Note that the P1_Frame_Multiplexing value of "11" is an area for future expansion.

[0297] (2b) Frequency division multiplexing (FDM)

[0298] (Example of P1 signaling) FIG. 39 is a diagram illustrating an example of the syntax of P1 signaling in the case of frequency division multiplexing (FDM).

[0299] In Figure 39, P1 signaling includes P1_P2_waveform_structure, P1_eas_wake_up, P1_band_width, and P1_Frame_Multiplexing.

[0300] The 7-bit P1_P2_waveform_structure includes, as a structure of P1 and P2 symbols, information that combines FFT size, GI, FEC type, pilot pattern, total number of segments, and number of segments in layer A. Note that, as this P1_P2_waveform_structure, for example, the information combinations shown in FIG. 32 can be defined.

[0301] In addition, 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.

[0302] (Example of P1_Frame_Multiplexing) FIG. 40 is a diagram showing an example of P1_Frame_Multiplexing in FIG.

[0303] In Figure 40, as in Figure 38, P1_Frame_Multiplexing is specified as "00" in the case of frequency division multiplexing (FDM), "01" in the case of time division multiplexing (TDM), and "10" in the case of hierarchical division multiplexing (LDM).

[0304] (2c) Layer division multiplexing method (LDM)

[0305] (Example of P1 signaling) FIG. 41 is a diagram illustrating an example of the syntax of P1 signaling in the case of layered division multiplexing (LDM).

[0306] In Figure 41, P1 signaling includes P1_P2_waveform_structure, P1_eas_wake_up, P1_band_width, and P1_Frame_Multiplexing.

[0307] The 7-bit P1_P2_waveform_structure includes information combining an FFT size, a GI, an FEC type, and a pilot pattern as a structure of P1 and P2 symbols. Note that, as this P1_P2_waveform_structure, for example, the combination information shown in FIG. 34 can be defined.

[0308] In addition, 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.

[0309] (Example of P1_Frame_Multiplexing) FIG. 42 is a diagram showing an example of P1_Frame_Multiplexing in FIG.

[0310] In Figure 42, as in Figure 38, P1_Frame_Multiplexing is specified as "00" in the case of frequency division multiplexing (FDM), "01" in the case of time division multiplexing (TDM), and "10" in the case of hierarchical division multiplexing (LDM).

[0311] The first solution method has been described above.

[0312] <5. P2 signaling configuration>

[0313] Next, with reference to Figures 43 to 59, L1B signaling (L1-Basic) and L1D signaling (L1-Detail) will be described as P2 signaling of a P2 symbol.

[0314] Here, the L1B signaling and the L1D signaling have the following differences, for example. That is, the L1B signaling is fixed length, while the L1D signaling is variable length. Therefore, the L1B signaling and the L1D signaling have different sizes. Usually, the size of the L1D signaling is larger than the size of the L1B signaling.

[0315] In addition, since the L1B signaling and the L1D signaling are read in that order, the L1B signaling is read before the L1D signaling. Furthermore, the L1B signaling is different from the L1D signaling in that it can be transmitted more robustly.

[0316] (1) L1B signaling configuration

[0317] First, the configuration of L1B signaling will be described with reference to Figures 43 to 47. Since the configuration of L1B signaling differs depending on the multiplexing method, the configuration of L1B signaling will be described below in the order of time division multiplexing (TDM), frequency division multiplexing (FDM), and hierarchical division multiplexing (LDM).

[0318] (1a) Time division multiplexing (TDM)

[0319] (Example of L1B signaling) FIG. 43 is a diagram showing an example of L1B signaling syntax in the case of time division multiplexing (TDM).

[0320] In Figure 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.

[0321] The 3-bit L1B_version indicates the version of the L1B signaling.

[0322] The 1-bit L1B_eas-wake_up represents an emergency alert flag.

[0323] The 1-bit L1B_lls_flag indicates a flag indicating the presence of higher layer signaling. For example, when LLS (Low Level Signaling) is defined as the higher layer signaling, the flag indicates whether the LLS exists.

[0324] The 1-bit L1B_time_info_flag indicates a flag for time information.

[0325] The 8-bit L1B_L1_Detail_size_bytes indicates the size of the L1D signaling.

[0326] The 2-bit L1B_L1_Detail_fec_type indicates the FEC type of the L1D signaling.

[0327] The 80-bit L1B_reserved represents an area for future expansion.

[0328] The 32-bit L1B_crc represents parity for error detection.

[0329] (1b) Frequency division multiplexing (FDM)

[0330] (Example of L1B signaling) FIG. 44 is a diagram showing an example of L1B signaling syntax in the case of frequency division multiplexing (FDM).

[0331] In Figure 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.

[0332] In Figure 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 Figure 43. That is, compared to Figure 43, L1B_num_layers is added to the L1B signaling in Figure 44.

[0333] The 2-bit L1B_num_layers indicates the number of layers (FDM layers).

[0334] In addition, in FIG. 44, the number of bits of L1B_reserved is 78 bits.

[0335] (1c) Layer division multiplexing method (LDM)

[0336] (Example of L1B signaling) FIG. 45 is a diagram showing an example of L1B signaling syntax in the case of layered division multiplexing (LDM).

[0337] In Figure 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.

[0338] In Figure 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 Figure 43. That is, compared to Figure 43, L1B_num_layers is added to the L1B signaling in Figure 45.

[0339] The 2-bit L1B_num_layers indicates the number of layers (LDM layers).

[0340] (1d) Example of common use for TDM, FDM, and LDM

[0341] Here, it is clear from the examples of syntax of P1 signaling and L1B signaling described above that the P1 signaling of TDM, FDM, and LDM shown in Figures 37 to 42 and the L1B signaling of TDM, FDM, and LDM shown in Figures 43 to 45 can be configured in almost the same way using the TDM, FDM, and LDM multiplexing methods.

[0342] That is, in the time division multiplexing (TDM), information about the layer is not necessarily required, but if information about the layer can be included in the signaling of the time division multiplexing (TDM), it can be shared with the frequency division multiplexing (FDM) and layer division multiplexing (LDM). Note that in the time division multiplexing (TDM), if subframes are not used, num_layers can be used as is.

[0343] (Example of P1 signaling) FIG. 46 is a diagram showing an example of the syntax of P1 signaling when it is common to TDM, FDM, and LDM.

[0344] In Figure 46, P1 signaling includes P1_P2_waveform_structure, P1_eas_wake_up, P1_band_width, and P1_Frame_Multiplexing.

[0345] The 7-bit P1_P2_waveform_structure has different meanings depending on the multiplexing method, namely, frequency division multiplexing (FDM), time division multiplexing (TDM), and hierarchical division multiplexing (LDM).

[0346] That is, in the case of time division multiplexing (TDM), the P1_P2_waveform_structure includes information combining the FFT size, GI, FEC type, and pilot pattern.

[0347] In addition, in the case of frequency division multiplexing (FDM), P1_P2_waveform_structure includes information combining FFT size, GI, FEC type, pilot pattern, total number of segments, and number of segments in layer A. In addition, in the case of layer division multiplexing (LDM), P1_P2_waveform_structure includes information combining FFT size, GI, FEC type, and pilot pattern.

[0348] These multiplexing methods (FDM, TDM, LDM) can be distinguished by the value of P1_Frame_Multiplexing. The value of P1_Frame_Multiplexing is the same as that shown in FIG.

[0349] (Example of L1B signaling) FIG. 47 is a diagram showing an example of L1B signaling syntax when common to TDM, FDM, and LDM.

[0350] In Figure 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.

[0351] In Figure 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 Figure 43. That is, compared to Figure 43, L1B_num_layers is added to the L1B signaling in Figure 47.

[0352] The 2-bit L1B_num_layers indicates the number of layers.

[0353] However, in the case of frequency division multiplexing (FDM), L1B_num_layers indicates the number of layers (FDM layers). Also, in the case of layer division multiplexing (LDM), L1B_num_layers indicates the number of layers (LDM layers). Note that in the case of time division multiplexing (TDM), L1B_num_layers is not necessarily required information, and is unused when not required.

[0354] (2) L1D signaling configuration

[0355] Next, the configuration of L1D signaling will be described with reference to Figures 48 to 59. Since the configuration of L1D signaling differs depending on the multiplexing method, the configuration of L1D signaling will be described below in the order of time division multiplexing (TDM), frequency division multiplexing (FDM), and hierarchical division multiplexing (LDM).

[0356] (2a) Time division multiplexing (TDM)

[0357] (First example of L1D signaling) FIG. 48 is a diagram showing a first example of syntax for L1D signaling in the case of time division multiplexing (TDM).

[0358] The L1D signaling in FIG. 48 corresponds to the P2 signaling in the P2 symbol of the physical layer frame corresponding to the subframe shown in FIG.

[0359] The 4-bit L1D_version indicates the version of the L1D signaling.

[0360] When the L1B_time_info_flag in the L1B signaling indicates that time information is present, the 64-bit L1D_ntp_time is described. L1D_ntp_time indicates the time information.

[0361] 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.

[0362] When P1_eas_wake_up of the P1 signaling indicates the presence of an emergency alert, 8-bit L1B_eas_code is described. L1B_eas_code indicates code information of the emergency alert.

[0363] The 2-bit L1D_num_subframes indicates the number of subframes. In the subframe loop corresponding to the number indicated by L1D_num_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 described.

[0364] These parameters can be specified for each subframe, so that the modulation parameters can be changed for each subframe.

[0365] Among these parameters, for example, 2-bit L1D_fft_size represents the FFT size of the target subframe, and 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.

[0366] The 2-bit L1D_num_layers_plp indicates the number of layers of the PLP (Physical Layer Pipe). In the PLP loop corresponding to the number indicated by L1D_num_layers_plp, 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.

[0367] Since these parameters can be specified for each PLP in each subframe, the modulation parameters can be changed for each PLP within a subframe.

[0368] Among these parameters, for example, the 4-bit L1D_plp_id indicates the ID of the target PLP. Also, for example, 4-bit L1D_plp_mod, 4-bit L1D_plp_cod, and 1-bit L1D_plp_type represent the modulation scheme, coding rate, and type, respectively, of the target PLP.

[0369] After exiting the PLP loop and the subframe loop, L1D_reserved and L1D_crc are written. L1D_reserved represents an area for future expansion. The 32-bit L1D_crc represents parity for error detection.

[0370] (Second example of L1D signaling) FIG. 49 is a diagram showing a second example of L1D signaling syntax for time division multiplexing (TDM).

[0371] The L1D signaling in Figure 49 corresponds to the P2 signaling of the P2 symbol of the physical layer frame not corresponding to the subframe shown in Figure 5. Therefore, in the L1D signaling in Figure 49, the description of the subframe loop is deleted compared to the L1D signaling in Figure 48.

[0372] That is, in the L1D signaling of FIG. 49, the following parameters are described within a hierarchical loop according to the number indicated by L1B_num_layers in the L1B signaling.

[0373] 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.

[0374] These parameters overlap with the parameters of L1D signaling in FIG. 48, so their description will be omitted here.

[0375] (2b) Frequency division multiplexing (FDM)

[0376] (First example of L1D signaling) In a first example, a single L1D signaling includes information specific to layer A and layer B (FDM layers) and information common to layer A and layer B (FDM layers).

[0377] FIG. 50 is a diagram showing a first example of syntax for L1D signaling in the case of frequency division multiplexing (FDM).

[0378] The L1D signaling in Figure 50 describes 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 as information common to layer A and layer B.

[0379] In addition, in the L1D signaling of Figure 50, the following parameters are described within a hierarchical loop according to the number indicated by L1B_num_layers in the L1B signaling.

[0380] That is, in this hierarchy 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 described. The parameters in this hierarchy loop are described as information specific to each layer, Layer A and Layer B. The 6-bit L1D_numsegs indicates the number of segments in each layer.

[0381] In this way, the L1D signaling in FIG. 50 describes information that is specific to each layer, layer A, and layer B, as well as information that is common to each layer, layer A, and layer B.

[0382] (Second example of L1D signaling) In the second example, L1D signaling is prepared for each of layers A and B (FDM layers), and information specific to each layer is described. At that time, information common to 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. In other words, in the second example, information common to layers A and B is included only in the L1D signaling of layer A.

[0383] FIG. 51 is a diagram showing a second example (layer A) of L1D signaling syntax for frequency division multiplexing (FDM).

[0384] The L1D signaling in Figure 51 describes information specific to layer A, so compared to the L1D signaling in Figure 50, the description of the layer loop is removed and parameters for layer A rather than all layers are described.

[0385] That is, in the L1D signaling of Figure 51, 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.

[0386] Moreover, information common to layer A and layer B is described in the L1D signaling of Figure 51. That is, the L1D signaling of Figure 51 describes 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 as information common to layer A and layer B.

[0387] In this way, the L1D signaling in FIG. 51 describes information that is specific to layer A as well as information that is common to both layers A and B.

[0388] FIG. 52 is a diagram showing a second example (layer B) of L1D signaling syntax for frequency division multiplexing (FDM).

[0389] In the L1D signaling of Figure 52, 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 describe information specific to hierarchy B.

[0390] As described above, information common to layer A and layer B is described in the L1D signaling of layer A (Figure 51), so there is no need to describe it in the L1D signaling of layer B (Figure 52).

[0391] In this way, only information specific to layer B is described in the L1D signaling of FIG.

[0392] (Third example of L1D signaling) In the third example, L1D signaling is prepared for each layer, layer A and layer B (FDM layer), and information specific to each layer is described. At that time, information common between layers, such as layer A and layer B, is included in the L1D signaling of all layers. In other words, in the third example, information common to layer A and layer B is included in both the L1D signaling of layer A and the L1D signaling of layer B.

[0393] FIG. 53 is a diagram showing a third example (layer A) of L1D signaling syntax for frequency division multiplexing (FDM).

[0394] In the L1D signaling of Figure 53, 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 describe information specific to layer A.

[0395] In addition, the L1D signaling in Figure 53 includes 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 as information common to layer A and layer B.

[0396] In this way, the L1D signaling in FIG. 53 describes information common to both layers A and B as well as information specific to layer A.

[0397] FIG. 54 is a diagram showing a third example (layer B) of L1D signaling syntax for frequency division multiplexing (FDM).

[0398] In the L1D signaling of Figure 54, 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 describe information specific to hierarchy B.

[0399] In addition, the L1D signaling in Figure 54 includes 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 as information common to layer A and layer B.

[0400] In this way, the L1D signaling in FIG. 54 describes information common to layers A and B as well as information specific to layer B.

[0401] (2c) Layer division multiplexing method (LDM)

[0402] (First example of L1D signaling) In a first example, a single L1D signaling includes information specific to each of hierarchical layers k and k+1 (LDM hierarchical layers) and information common to hierarchical layers k and k+1 (LDM hierarchical layers).

[0403] FIG. 55 is a diagram showing a first example of syntax for L1D signaling in the case of layered division multiplexing (LDM).

[0404] The L1D signaling in Figure 55 describes 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 as information common to layer k and layer k+1.

[0405] In addition, in the L1D signaling of Figure 55, the following parameters are described within a hierarchical loop according to the number indicated by L1B_num_layers in the L1B signaling.

[0406] That is, in this hierarchy 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 in this hierarchy loop are described as information specific to each of the layers k and k+1.

[0407] In this way, the L1D signaling in FIG. 55 describes information that is specific to each layer, layer k, and layer k+1, as well as information that is common to each layer, layer k, and layer k+1.

[0408] (Second example of L1D signaling) In the second example, L1D signaling is prepared for each of the layers k and k+1 (LDM layers), and information specific to each layer is described. At this time, information common to layers k and k+1 is included in the L1D signaling of one of the layers, but is not included in the L1D signaling of the other layers. In other words, in the second example, information common to layers k and k+1 is included only in the L1D signaling of layer k.

[0409] FIG. 56 is a diagram illustrating a second example (layer k) of L1D signaling syntax in the case of layer division multiplexing (LDM).

[0410] The L1D signaling in Figure 56 describes information specific to layer k, so compared to the L1D signaling in Figure 55, the description of the layer loop is removed and parameters for layer k are described rather than for all layers.

[0411] That is, in the L1D signaling of Figure 56, 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 describe information specific to layer k.

[0412] Moreover, information common to layer k and layer k+1 is described in the L1D signaling of Figure 56. That is, the L1D signaling of Figure 56 describes 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 as information common to layer k and layer k+1.

[0413] In this way, the L1D signaling in FIG. 56 describes information specific to layer k as well as information common to layers k and k+1.

[0414] FIG. 57 is a diagram showing a second example (layer k+1) of L1D signaling syntax in the case of layer division multiplexing (LDM).

[0415] In the L1D signaling of Figure 57, 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 describe information specific to layer k+1.

[0416] As mentioned above, information common to layer k and layer k+1 is described in the L1D signaling of layer k (Figure 56), so there is no need to describe it in the L1D signaling of layer k+1 (Figure 57).

[0417] In this way, only information specific to layer k+1 is described in the L1D signaling of FIG.

[0418] (Third example of L1D signaling) In the third example, L1D signaling is prepared for each of the layers k and k+1 (LDM layers), 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 to layer k and layer k+1 is included in both the L1D signaling of layer k and the L1D signaling of layer k+1.

[0419] FIG. 58 is a diagram showing a third example (layer k) of L1D signaling syntax in the case of layer division multiplexing (LDM).

[0420] In the L1D signaling of Figure 58, 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 describe information specific to layer k.

[0421] In addition, the L1D signaling in Figure 58 includes 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 as information common to layer k and layer k+1.

[0422] In this way, the L1D signaling in FIG. 58 describes information common to layers k and k+1 as well as information specific to layer k.

[0423] FIG. 59 is a diagram showing a third example (layer k+1) of L1D signaling syntax in the case of layer division multiplexing (LDM).

[0424] In the L1D signaling of Figure 59, 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 describe information specific to layer k+1.

[0425] In addition, the L1D signaling in Figure 59 describes 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 as information common to layer k and layer k+1.

[0426] In this way, the L1D signaling in FIG. 59 describes information common to layers k and k+1 as well as information specific to layer k+1.

[0427] <6. Second solution>

[0428] As described above, when a frequency division multiplexing (FDM) method such as the current ISDB-T is adopted, L1 signaling such as TMCC information is distributed in the physical layer frame, which causes a problem that the receiving device 30 always requires one frame to achieve synchronization. However, the present technology solves this problem by the second solution method.

[0429] (Example of centralized signaling placement) FIG. 60 is a diagram showing an example of a concentrated arrangement of L1 signaling in a physical layer frame to which the present technology is applied.

[0430] In FIG. 60, FIG. 60B shows the configuration of a physical layer frame to which the present technology is applied, and for comparison, FIG. 60A shows the configuration of a physical layer frame of the current ISDB-T.

[0431] In FIG. 60A, the horizontal direction is the frequency axis representing the subcarrier number (carrier number), and the vertical direction is the time axis representing the OFDM symbol number (OFDM symbol number).

[0432] Here, ISDB-T specifies three transmission modes, modes 1, 2, and 3, which have different intervals between OFDM subcarriers. In addition, ISDB-T specifies four modulation methods for the subcarriers: QPSK (Quaternary Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), 64QAM, and DQPSK (Differential QPSK).

[0433] Figure 60A shows the configuration of an OFDM segment in which the transmission mode is mode 1 and the modulation scheme is QPSK, 16QAM, or 64QAM. In Figure 60A, one OFDM frame is made up of 204 OFDM symbols.

[0434] In FIG. 60A, Si,j represents the data symbol (carrier symbol) of the subcarrier modulated with higher layer data, and the OFDM segment is constructed by adding each symbol (subcarrier) of the pilot signal SP (Scattered Pilot), the TMCC signal, and the AC (Auxiliary Channel) signal to the data symbol.

[0435] The TMCC signal is a signal for transmitting TMCC information as signaling (control information), and the AC signal is an extension signal for transmitting additional information related to broadcasting. This AC signal can transmit AC information such as emergency alert information. In other words, the TMCC information and AC information can be said to be L1 signaling.

[0436] The current ISDB-T OFDM segment configuration is described in "3.12 Frame Configuration" in the above-mentioned Non-Patent Document 1.

[0437] 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 arranged in a dispersed manner. Therefore, in the receiving device 30, at least one physical layer frame must be processed before acquiring the L1 signaling, and the frame length (time) of one physical layer frame is always required for synchronization.

[0438] On the other hand, the physical layer frame to which the present technology is applied has the configuration shown in FIG. 60B.

[0439] Figure 60B shows the configuration of a physical layer frame when using frequency division multiplexing (FDM), with the direction from left to right in the figure being the direction of frequency (Freq) and the direction from top to bottom in the figure being the direction of time (Time).

[0440] In FIG. 60B, a frame synchronization symbol (FSS) is inserted at the beginning of the physical layer frame, followed by a P1 symbol (P1).

[0441] Furthermore, when frequency division multiplexing (FDM) is used, a predetermined frequency band (e.g., 6 MHz) is frequency-divided into multiple segments, and a P2 symbol (P2), a data symbol, and a boundary symbol (BS) are arranged for each layer, layer A and layer B.

[0442] 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. Also, the P2 symbol includes P2 signaling such as L1B signaling and L1D signaling.

[0443] That is, the L1 signaling included in the P1 symbol and the P2 symbol is concentrated at the beginning of the physical layer frame, so that when the receiving device 30 processes the physical layer frame, it can quickly acquire the L1 signaling concentrated at the beginning, thereby shortening the time required for synchronization.

[0444] Here, for example, it is possible to obtain L1 signaling in approximately half the frame length of one physical layer frame, and as a result, the time required to achieve synchronization can be shortened compared to the current ISDB-T physical layer frame, which always requires the frame length (time) of one physical layer frame.

[0445] The configuration of the physical layer frame in Fig. 60B corresponds to the configuration of the physical layer frame when frequency division multiplexing (FDM) in Fig. 8 is used. Also, although frequency division multiplexing (FDM) has been described here, as shown in Fig. 5, Fig. 6 and Fig. 9, L1 signaling is also concentrated at the beginning of the physical layer frame when time division multiplexing (TDM) is used and when hierarchical division multiplexing (LDM) is used.

[0446] The second solution method has been described above.

[0447] <7. The third solution>

[0448] As described above, with current technology, the payload of a physical layer frame can be converted into frequency division multiplexing (FDM) or hierarchical division multiplexing (LDM) by applying FDM or LDM, but there is a problem that the frame synchronization symbol (FSS) and preamble cannot be converted into FDM or LDM. However, the present technology solves this problem by a third solution method.

[0449] (Example of FSS, P1, and P2 placement for FDM and LDM) FIG. 61 is a diagram showing an example of the arrangement of a frame synchronization symbol (FSS), a P1 symbol (P1), and a P2 symbol (P2) in a frequency division multiplexing system (FDM) and a hierarchical division multiplexing system (LDM).

[0450] In Figure 61, Figure 61A shows the structure of a physical layer frame when frequency division multiplexing (FDM) is used, and Figure 61B shows the structure of a physical layer frame when layer division multiplexing (LDM) is used.

[0451] In FIG. 61A, a frame synchronization symbol (FSS) is inserted at the beginning of the physical layer frame, followed by a P1 symbol (P1).

[0452] Furthermore, when frequency division multiplexing (FDM) is used, a predetermined frequency band (e.g., 6 MHz) is frequency-divided into multiple segments, and a P2 symbol (P2), a data symbol (Frame), and a boundary symbol (BS) are arranged for each of the layers A and B (FDM layers).

[0453] At this time, as shown in the box in Fig. 61A, the P2 symbol is allocated to each layer, layer A and layer B, by dividing the data allocated thereto. Therefore, in the physical layer frame shown in Fig. 61A, not only the data symbols and boundary symbols but also the preambles of the P2 symbol and the like can be FDM-coded.

[0454] 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).

[0455] Furthermore, when layer division multiplexing (LDM) is used, a P2 symbol (P2), a data symbol (Frame), and a boundary symbol (BS) are arranged for each layer (LDM layer) having a different transmission power.

[0456] At this time, as shown in the frame in Fig. 61B, the P2 symbol is 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 the P2 symbol can be LDM-ized.

[0457] In this way, in the third solution method, when frequency division multiplexing (FDM) or hierarchical division multiplexing (LDM) is used, not only data symbols and boundary symbols but also preambles such as P2 symbols can be FDM- or LDM-encoded.

[0458] Note that the physical layer frame configuration in Figure 61A corresponds to the physical layer frame configuration in the case of frequency division multiplexing (FDM) in Figure 7 described above, and the physical layer frame configuration in Figure 61B corresponds to the physical layer frame configuration in the case of layer division multiplexing (LDM) in Figure 9 described above.

[0459] The above describes the third solution method.

[0460] <8. Operation of the receiving device>

[0461] Next, the operation of the receiving device 30 in FIG. 1 will be described with reference to FIGS.

[0462] (1) Processing of time division multiplexed (TDM) physical layer frames

[0463] (Frame processing example) FIG. 62 is a diagram for explaining the receiving side processing of a physical layer frame in the case of time division multiplexing (TDM).

[0464] As shown in Fig. 62, when time division multiplexing (TDM) is used, a frame synchronization symbol (FSS), a P1 symbol (P1), and a P2 symbol (P2) are arranged in this order from the beginning of the physical layer frame. In the example of Fig. 62, the physical layer frame corresponds to subframes, so two subframes, subframe n and subframe n+1, are arranged following the P2 symbol (P2).

[0465] Here, the receiving device 30 can recognize the beginning of the physical layer frame by the frame synchronization symbol (FSS) and obtain the P1 symbol information (P1 signaling). Also, the receiving device 30 can extract the P2 symbol information (P2 signaling) from the physical layer frame using the P1 signaling information, and further extract the data symbol.

[0466] Furthermore, when two or more subframes are arranged, the modulation parameters can be changed for each subframe, but the L1D signaling includes information on the modulation parameters for each subframe. Therefore, the receiving device 30 can extract the data symbols of each subframe from the physical layer frame by using the information on the L1D signaling (for example, information in the subframe loop of the L1D signaling in FIG. 48).

[0467] In addition, in the receiving device 30, it is also possible to selectively extract data symbols of subframe n within the box in FIG. 62 from the physical layer frame using information of L1D signaling.

[0468] (2) Processing of frequency division multiplexing (FDM) physical layer frames

[0469] (Frame processing example) FIG. 63 is a diagram for explaining the processing on the receiving side for a physical layer frame in the case of frequency division multiplexing (FDM).

[0470] As shown in Figure 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 then a P2 symbol (P2), a data symbol (Frame), and a boundary symbol (BS) are arranged for each layer (FDM layer) such as layer A and layer B.

[0471] Here, when the receiving device 30 receives the entire bandwidth of a predetermined frequency band (for example, 6 MHz) allocated to a channel, it can recognize the beginning of the physical layer frame by the frame synchronization symbol (FSS) and obtain the P1 symbol information (P1 signaling). In addition, the receiving device 30 can extract the P2 symbol information (P2 signaling) from the physical layer frame using the P1 signaling information, and further extract the data symbol.

[0472] Furthermore, when the receiving device 30 receives a partial band corresponding to Layer A of a predetermined frequency band, the receiving device 30 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 symbols, data symbols, and boundary symbols for each layer of Layer A and Layer B are represented in segment units.

[0473] 64, each of the hierarchical layers A and B is composed of multiple segments, but for example, the total number of segments may be 35, and the hierarchical layer A including the central segment may be the central 9 segments. In other words, when receiving a partial band corresponding to the hierarchical layer A, the receiving device 30 receives only the frequency band of the central 9 segments.

[0474] In this case, the receiving device 30 can recognize the beginning of the physical layer frame by a sufficiently robust frame synchronization symbol (FSS) and obtain the P1 symbol information (P1 signaling). The receiving device 30 can also recognize the number of segments (e.g., 9 segments) of layer A from the P1 signaling information (e.g., P1_P2_waveform_structure in FIG. 31).

[0475] Therefore, in the receiving device 30, using the P1 signaling information, it is possible to extract P2 symbol information (P2 signaling) from the partial band corresponding to layer A consisting of the central nine segments, and further extract data symbols.

[0476] For example, in FIG. 65, even if the total number of segments is 35 and the central 7 segments are set to hierarchical A, the receiving device 30 can receive the frequency band of the central 9 segments as a partial band, and can extract the P2 signaling using the information of the P1 signaling, and further extract the data symbol.

[0477] (3) Processing of physical layer frames for hierarchical division multiplexing (LDM)

[0478] (Frame processing example) FIG. 66 is a diagram for explaining the processing on the receiving side for a physical layer frame in the case of layer division multiplexing (LDM).

[0479] 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 this 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), the data symbol (Frame), and the boundary symbol (BS) are arranged for each layer (LDM layer) such as layer k and layer k+1.

[0480] Here, the receiving device 30 can recognize the beginning of the physical layer frame by the frame synchronization symbol (FSS) and obtain P1 symbol information (P1 signaling). Also, the receiving device 30 can use the P1 signaling information to extract P2 symbol information (P2 signaling) for each layer, such as layer k and layer k+1, and further extract data symbols.

[0481] In addition, in the receiving device 30, it is also possible to selectively extract a part of the layer (LDM layer) within the frame in FIG. 66 from the physical layer frame by using information of L1 signaling.

[0482] <9. Processing flow for each solution method>

[0483] Next, with reference to the flowcharts in Figures 67 to 71, the flow of processing on the transmitting side and the receiving side corresponding to the above-mentioned first to third solving methods will be described.

[0484] (Processing corresponding to the first solution) First, the flow of processing on the transmitting side and the receiving side corresponding to the first solution method will be described with reference to the flowcharts of Figures 67 and 68. However, as described above, there are two types of the first solution method, a synchronization pattern solution method using different synchronization patterns and a P1 signaling solution method using P1 signaling, so they will be described in order.

[0485] (Processing corresponding to the synchronization pattern solving method) The flow of processing on the transmitting side and the receiving side corresponding to the synchronization pattern solving method will be described with reference to the flowchart in FIG.

[0486] In step S11, the component processing unit 111 to the data processing unit 114 of the data processing device 10 generate a stream.

[0487] In the process of step S11, the multiplexer 13 multiplexes the component stream from the component processing unit 111 and the higher layer signaling stream from the signaling generation unit 112. Then, the data processing unit 114 processes the stream obtained as a result of the multiplexing, and generates a transmission data stream.

[0488] In step S12, the data processing unit 211 of the transmitting device 20 processes the stream obtained in the processing of step S11 to generate a physical layer frame.

[0489] In the processing of step S12, a physical layer frame is generated using the synchronization pattern resolution method described above for each multiplexing method (FDM, TDM, LDM) so that a different synchronization pattern (e.g., the synchronization pattern in Figure 28) is obtained using a common frame synchronization symbol (FSS).

[0490] In step S13, the modulation section 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 from a transmitting antenna installed at the transmitting station.

[0491] In step S21, the RF unit 311 of the receiving device 30 receives a broadcast signal transmitted from a transmitting antenna installed at a transmitting station.

[0492] In step S22, the demodulation unit 312 of the receiving device 30 processes the physical layer frame obtained from the broadcast signal received in the processing of step S21.

[0493] In the processing of step S22, the above-mentioned synchronization pattern resolution method is used to determine the multiplexing method (FDM, TDM, LDM) based on different synchronization patterns (e.g., the synchronization patterns in Figure 28) using a common frame synchronization symbol (FSS), and a transmission data stream is obtained by processing the physical layer frame according to the determination result.

[0494] In step S23, the data processing unit 313 of the receiving device 30 processes the stream obtained in the processing of step S22.

[0495] In the process of step S23, the transmission data stream is processed to obtain higher-layer signaling and component streams. Then, the higher-layer signaling and component streams are processed to play back content such as a broadcast program.

[0496] The above describes the process flow corresponding to the synchronization pattern solving method.

[0497] (Processing corresponding to P1 signaling solution method) With reference to the flowchart in Figure 68, the process flow on the transmitting side and receiving side corresponding to the P1 signaling solution method will be described.

[0498] In addition, in Figure 68, the processing of steps S31 and S33 on the transmitting side and the processing of steps S41 and S43 on the receiving side are similar to the processing of steps S11 and S13 in Figure 67 described above and steps S21 and S23 in Figure 67, so their explanation is omitted.

[0499] In step S32 on the transmitting side, the data processing unit 211 of the transmitting device 20 processes the stream obtained in the processing of step S31 to generate a physical layer frame.

[0500] In the process of step S32, a physical layer frame including P1 signaling describing discrimination information (e.g., P1_Frame_Multiplexing in Figs. 37, 39, and 41) for discriminating the multiplexing method (FDM, TDM, LDM) is generated by the above-mentioned P1 signaling solution method. However, in this physical frame, a common frame synchronization symbol (FSS) is used, and the same synchronization pattern is used.

[0501] On the other hand, in step S42 on the receiving side, the demodulation unit 312 of the receiving device 30 processes the physical layer frame obtained from the broadcast signal received in the process of step S41.

[0502] In the processing of step S42, the above-mentioned P1 signaling resolution method is used to determine the multiplexing method (FDM, TDM, LDM) based on the discrimination information described in the P1 signaling (e.g., P1_Frame_Multiplexing in Figures 37, 39, and 41), and the physical layer frame is processed according to the discrimination result, thereby obtaining a stream of transmission data.

[0503] The above describes the process flow corresponding to the P1 signaling solution method.

[0504] (Processing corresponding to the second solution) Next, the flow of processing on the transmitting side and receiving side corresponding to the second solution method will be described with reference to the flowchart in FIG.

[0505] In step S51, similarly to the processing in step S11 in FIG. 67, a stream is generated by the component processing unit 111 to the data processing unit 114 of the data processing device 10.

[0506] In step S52, the data processing unit 211 of the transmitting device 20 processes the stream obtained in the process of step S51 to generate a physical layer frame.

[0507] In the processing of step S52, a physical layer frame (for example, the physical layer frame of FIG. 60B) is generated using the second solution method described above so that L1 signaling such as L1B signaling and L1D signaling is concentrated at the beginning (the beginning side).

[0508] In step S53, similar to the processing in step S13 in Fig. 67, a broadcast signal is transmitted by the modulation unit 212 of the transmission device 20. In step S61, similar to the processing in step S21 in Fig. 67, a broadcast signal is received by the RF unit 311 of the reception device 30.

[0509] In step S62, the demodulation unit 312 of the receiving device 30 processes the physical layer frame obtained from the broadcast signal received in the processing of step S61.

[0510] In the processing of step S62, the L1 signaling concentrated at the beginning (leading end) of a physical layer frame (for example, the physical layer frame in Figure 60B) is obtained using the second solution method described above, and the physical layer frame is processed to obtain a stream of transmission data.

[0511] In step S63, similarly to step S23 in FIG. 67, the stream is processed by the data processing unit 313 of the receiving device 30.

[0512] The process flow corresponding to the second solution method has been described above.

[0513] (Processing corresponding to the third solution) Finally, the flow of processing on the transmitting side and the receiving side corresponding to the above-mentioned third solution method will be described with reference to the flowcharts of Figures 70 and 71. However, as described above, there are two types of solution method for the third solution method, one for handling frequency division multiplexing (FDM) and one for handling hierarchical division multiplexing (LDM), so they will be described in order.

[0514] (FDM compatible processing) The flow of processing on the transmitting side and receiving side corresponding to the third solution method for FDM will be described with reference to the flowchart in FIG.

[0515] In step S71, similarly to the processing in step S11 in FIG. 67, a stream is generated by the component processing unit 111 to the data processing unit 114 of the data processing device 10.

[0516] In step S72, the data processing unit 211 of the transmitting device 20 processes the stream obtained in the process of step S71 to generate a physical layer frame.

[0517] In the processing of step S72, a physical layer frame (for example, the physical layer frame of Figure 61A) is generated by placing the P2 symbol (the P2 signaling) in each layer (FDM layer) of layer A and layer B and converting it into FDM using the third FDM-compatible solution method described above.

[0518] In step S73, similar to the processing in step S13 of Fig. 67, a broadcast signal is transmitted by the modulation unit 212 of the transmission device 20. In step S81, similar to the processing in step S21 of Fig. 67, a broadcast signal is received by the RF unit 311 of the reception device 30.

[0519] In step S82, the demodulation unit 312 of the receiving device 30 processes the physical layer frame obtained from the broadcast signal received in the processing of step S81.

[0520] In the processing of step S82, the third FDM-compatible solution method described above is used to obtain P2 signaling (L1B signaling and L1D signaling) from the P2 symbol that has been FDM-encoded in a physical layer frame (for example, the physical layer frame of Figure 61A), and the physical layer frame is processed to obtain a stream of transmission data.

[0521] In step S83, similarly to step S23 in FIG. 67, the stream is processed by the data processing unit 313 of the receiving device 30.

[0522] The above describes the process flow corresponding to the third solution method compatible with FDM.

[0523] (LDM compatible processing) The flow of processing on the transmitting side and receiving side corresponding to the third solution method for LDM will be described with reference to the flowchart in FIG.

[0524] In addition, in Figure 71, the processing of steps S91 and S93 on the transmitting side and the processing of steps S101 and S103 on the receiving side are similar to the processing of steps S71 and S73 in Figure 70 described above and steps S81 and S83 in Figure 70, so their explanation is omitted.

[0525] In step S92 on the transmitting side, the data processing unit 211 of the transmitting device 20 processes the stream obtained in the processing of step S91 to generate a physical layer frame.

[0526] In the processing of step S92, a physical layer frame (for example, the physical layer frame of FIG. 61B) is generated by placing the P2 symbol (the P2 signaling) in each layer (LDM layer) such as layer k or layer k+1 and converting it into LDM using the third solution method for LDM described above.

[0527] 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.

[0528] In the processing of step S102, the third LDM-compatible solution method described above is used to obtain P2 signaling (L1B signaling and L1D signaling) from the P2 symbol that has been LDM-enhanced in a physical layer frame (e.g., the physical layer frame of Figure 61B), and the physical layer frame is processed to obtain a stream of transmission data.

[0529] The above describes the process flow corresponding to the third solution method for LDM.

[0530] <10. Variations>

[0531] (Combination of solutions) In the above description, the first to third solutions are described separately, but two or more solutions may be combined.

[0532] For example, by combining the first and second solutions, when the same synchronization pattern is used in a common frame synchronization symbol (FSS) in a physical layer frame, it is possible to concentrate L1 signaling at the beginning of the FSS. This allows the receiver 30 to not only determine the multiplexing method when processing the physical layer frame, but also to shorten the time required to achieve synchronization.

[0533] Also, for example, by combining the first and third solutions, it is possible to include discrimination information for discriminating the multiplexing method as PI signaling information in the physical layer frame, and to arrange a P2 symbol for each layer (FDM layer or LDM layer). This allows the receiving device 30 to not only discriminate the multiplexing method when processing the physical layer frame, but also to convert the preamble of the physical layer frame into FDM or LDM.

[0534] (Other multiplexing methods) In the above description, three multiplexing methods, namely, frequency division multiplexing (FDM), time division multiplexing (TDM), and hierarchical division multiplexing (LDM), are exemplified as multiplexing methods, but other multiplexing methods, such as, for example, hierarchical time division multiplexing (LDM_TDM) and hierarchical frequency division multiplexing (LDM_FDM), may be included. In addition, the multiplexing method is not limited to the three multiplexing methods, namely, frequency division multiplexing (FDM), time division multiplexing (TDM), and hierarchical division multiplexing (LDM), and may be any method that involves two or more multiplexing methods.

[0535] (Application to other broadcasting systems) The above explanation has focused on ISDB (Integrated Services Digital Broadcasting), a standard for digital television broadcasting adopted in Japan and other countries. However, the present technology may also be applied to ATSC (Advanced Television Systems Committee), a standard adopted in the United States and other countries, or DVB (Digital Video Broadcasting), a standard adopted in European countries and other countries.

[0536] That is, even in the current ATSC and DVB, there is no provision for implementing multiple multiplexing methods (e.g., FDM, TDM, LDM, etc.) in the same broadcasting system, and by applying this technology, more flexible operation is possible when implementing multiple multiplexing methods in the same broadcasting system. In addition, the above-mentioned layer (FDM layer) can be conceptually regarded as a PLP (Physical Layer Pipe). In this case, the multiple layers can also be said to be M-PLP (Multiple-PLP).

[0537] In addition, the digital television broadcasting standard can be applied to terrestrial broadcasting, as well as satellite broadcasting using broadcast satellites (BS) and communication satellites (CS), and wired broadcasting such as cable television (CATV).

[0538] (Other examples of packets and signaling) The names of the packets, frames, signaling (control information), etc. mentioned above are merely examples, and other names may be used. However, the difference between these names is merely a formal difference, and does not mean that the actual contents of the packets, frames, signaling, etc. are different.

[0539] The present technology can also be applied to a transmission path other than a broadcast network, that is, a predetermined standard (a standard other than a digital broadcast standard) that is defined assuming the use of a communication line (communication network) such as the Internet or a telephone network as a transmission path. 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 transmitting device 20 are provided by a communication server provided on the Internet. Then, the communication server and the receiving device 30 perform bidirectional communication via the communication line.

[0540] <11. Computer configuration>

[0541] The above-mentioned series of processes can be executed by hardware or software. When the series of processes is executed by software, a program constituting the software is installed in a computer. Figure 72 is a diagram showing an example of the hardware configuration of a computer that executes the above-mentioned series of processes by a program.

[0542] 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 unit 1006, an output unit 1007, a recording unit 1008, a communication unit 1009, and a drive 1010 are connected to the input / output interface 1005.

[0543] The input unit 1006 includes a keyboard, a mouse, a microphone, etc. The output unit 1007 includes a display, a speaker, etc. The recording unit 1008 includes a hard disk, a non-volatile memory, etc. The communication unit 1009 includes a network interface, etc. 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.

[0544] In the computer 1000 configured as described above, the CPU 1001 loads a program recorded in the ROM 1002 or the recording unit 1008 into the RAM 1003 via the input / output interface 1005 and the bus 1004, and executes it, thereby performing the series of processes described above.

[0545] The 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. The program can also be provided via a wired or wireless transmission medium such as a local area network, the Internet, or digital satellite broadcasting.

[0546] In the computer 1000, the program can be installed in the recording unit 1008 via the input / output interface 1005 by mounting the removable recording medium 1011 in the drive 1010. The program can also be received by the communication unit 1009 via a wired or wireless transmission medium and installed in the recording unit 1008. Alternatively, the program can be installed in the ROM 1002 or the recording unit 1008 in advance.

[0547] Here, in this specification, the processing performed by a computer according to a program does not necessarily have to be performed in chronological order according to the order described in the flowchart. In other words, the processing performed by a computer according to a program also includes processing executed in parallel or individually (for example, parallel processing or object-based processing). In addition, the program may be processed by one computer (processor), or may be processed in a distributed manner by multiple computers.

[0548] The embodiments of the present technology are not limited to the above-described embodiments, and various modifications are possible without departing from the gist of the present technology.

[0549] The present technology can also be configured as follows.

[0550] (1) a generating unit that generates a physical layer frame multiplexed in a predetermined multiplexing method, the physical layer frame including identification information that allows identification of the multiplexing method; a transmitting unit that transmits the physical layer frame as a broadcast signal; A transmitting device comprising: (2) The discrimination information is a synchronization pattern that is used in a frame synchronization symbol inserted at the beginning of the physical layer frame and that differs for each multiplexing method. The transmitting device according to (1) above. (3) The discrimination information is information of physical layer signaling included in the physical layer frame. The transmitting device according to (1) above. (4) The signaling is P1 signaling in a P1 symbol. The transmitting device according to (3) above. (5) The multiplexing method includes at least one of a frequency division multiplexing method (FDM), a time division multiplexing method (TDM), and a hierarchical division multiplexing method (LDM). A transmitting device according to any one of (1) to (4). (6) generating a physical layer frame multiplexed in a predetermined multiplexing method, the physical layer frame including identification information for identifying the multiplexing method; The physical layer frame is transmitted as a broadcast signal. A sending method including steps. (7) A receiving unit for receiving a broadcast signal; a processing unit that determines a multiplexing method of the physical layer frame multiplexed in a predetermined multiplexing method based on determination information included in the physical layer frame obtained from the broadcast signal, and processes the physical layer frame; A receiving device comprising: (8) The discrimination information is a synchronization pattern that is used in a frame synchronization symbol inserted at the beginning of the physical layer frame and that differs for each multiplexing method. The receiving device according to (7) above. (9) The discrimination information is information of physical layer signaling included in the physical layer frame. The receiving device according to (7) above. (10) The signaling is P1 signaling in a P1 symbol. The receiving device according to (9) above. (11) The multiplexing method includes at least one of a frequency division multiplexing method (FDM), a time division multiplexing method (TDM), and a hierarchical division multiplexing method (LDM). A receiving device according to any one of (7) to (10). (12) Receives broadcast signals, Based on discrimination information included in the physical layer frame obtained from the broadcast signal, a multiplexing method of the physical layer frame multiplexed in a predetermined multiplexing method is discriminated, and the physical layer frame is processed. A receiving method including steps. (13) a generating unit that generates a physical layer frame multiplexed by a predetermined multiplexing method, the physical layer frame having physical layer signaling concentrated at the beginning of the physical layer frame; a transmitting unit that transmits the physical layer frame as a broadcast signal; A transmitting device comprising: (14) generating a physical layer frame multiplexed in a predetermined multiplexing method, the physical layer frame having physical layer signaling concentrated at the beginning of the physical layer frame; Transmitting the physical layer frame as a broadcast signal. A sending method including steps. (15) A receiving unit for receiving a broadcast signal; a processing unit that acquires physical layer signaling concentrated at the beginning of a physical layer frame obtained from the broadcast signal, and processes the physical layer frame; A receiving device comprising: (16) Receives broadcast signals, Acquire physical layer signaling concentrated at the beginning of a physical layer frame obtained from the broadcast signal, and process the physical layer frame. A receiving method including steps. (17) A generating unit that generates a physical layer frame multiplexed by a predetermined multiplexing method, the physical layer frame having a P2 signaling of a P2 symbol arranged therein for each layer; a transmitting unit that transmits the physical layer frame as a broadcast signal; A transmitting device comprising: (18) generating a physical layer frame multiplexed in a predetermined multiplexing manner, the physical layer frame having P2 signaling of a P2 symbol arranged therein for each layer; Transmitting the physical layer frame as a broadcast signal. A sending method including steps. (19) A receiving unit for receiving a broadcast signal; a processing unit that acquires P2 signaling of P2 symbols arranged for each layer of a physical layer frame obtained from the broadcast signal, and processes the physical layer frame; A receiving device comprising: (20) Receives broadcast signals, Acquire P2 signaling of P2 symbols arranged for each layer of a physical layer frame obtained from the broadcast signal, and process the physical layer frame. A receiving method including steps. [Explanation of symbols]

[0551] 1 Transmission system, 10, 10-1 to 10-N Data processing device, 20 Transmitter, 30, 30-1 to 30-M Receiving device, 40, 40-1 to 40-N Communication line, 50 Broadcast transmission path, 111 Component processing unit, 112 Signaling generation unit, 113 Multiplexer, 114 Data processing unit, 211 Data processing unit, 212 Modulation unit, 311 RF unit, 312 Demodulation unit, 313 Data processing unit, 1000 Computer, 1001 CPU

Claims

1. A generating unit that generates a physical layer frame multiplexed by a frequency division multiplexing (FDM) method, the physical layer frame including a frame synchronization symbol, a P1 symbol, and a P2 symbol arranged in this order from the beginning of the physical layer frame; a transmitting unit that transmits the physical layer frame as a broadcast signal; Equipped with the P1 symbol and the P2 symbol include physical layer signaling; The signaling is concentrated at the beginning of the physical layer frame. Transmitting device.

2. The transmitting device, generating a physical layer frame multiplexed by frequency division multiplexing (FDM), the physical layer frame including a frame synchronization symbol, a P1 symbol, and a P2 symbol arranged in this order from the beginning of the physical layer frame; The physical layer frame is transmitted as a broadcast signal. Steps include: the P1 symbol and the P2 symbol include physical layer signaling; The signaling is concentrated at the beginning of the physical layer frame. Transmission method.

Images