KR102299289B1 - Method for transmitting and receiving information and apparatus using the method - Google Patents

Abstract

A method for transmitting information is disclosed. The information transmission method includes: mapping signaling information to at least one preamble symbol of a first frame; mapping data to at least one data symbol of a first frame; dividing additional information into at least two parts; mapping a first part of the side information to at least one preamble symbol of a first frame, and mapping the second part of the side information to (i) at least one data symbol of the first frame and (ii) at least one of the first frame. mapping to at least one of the preamble symbols of , and transmitting the frame.

Description

Method for transmitting and receiving information and apparatus therefor {Method for transmitting and receiving information and apparatus using the method }

The present invention relates to a method, apparatus and system for transmitting and receiving data. For example, according to certain embodiments of the present invention, a method, apparatus, and system for providing at least one additional channel in a frame structure including a preamble part and a data part are provided. Certain embodiments of the present invention may be applied to an existing or next-generation digital broadcasting system, for example, a system developed by Digital Video Broadcasting (DVB) and/or Advanced Television Systems Committee (ATSC).

Digital broadcasting technology provides end users with various types of digital content, such as video and audio data, for example. A number of standards have been developed for this purpose, including a series of ATSC 1.0 and ATSC 2.0 standards developed by the ATSC Association. ATSC Digital Television (hereinafter also referred to as "DTV") standard introduced in several publications, including A/52 and A/53 available at http://www.atsc.org/ It has been adopted for terrestrial broadcasting in various countries.

Recently, ATSC is undertaking the development of a new standard known as ATSC 3.0 for a method of delivering real-time and non-real-time television content and data to stationary and mobile devices. As part of this development, ATSC has published the Call for Proposals (CFP) document (TG3-S2 Doc #023r20, "Call for Proposals For ATSC-3.0 PHYSICAL LAYER, A Terrestrial Broadcast Standard", ATSC Technology Group 3 (ATSC 3.0), 2013) 26 March), which aims to identify techniques that can be combined to create a new physical layer of the ATSC 3.0 standard. It is understood that the ATSC 3.0 system will be designed with a hierarchical architecture, and a generalized hierarchical model for ATSC 3.0 has been proposed. The scope of the above-described CFP is limited to the base layer of this model, that is, the ATSC 3.0 physical layer corresponding to Layers 1 and 2 of the ISO/IEC 7498-1 model.

ATSC 3.0 shall not require backward compatibility with current broadcast systems including ATSC 1.0 and ATSC 2.0. However, the CFP says that, wherever practicable, this standard will utilize and reference existing standards that are known to be effective solutions to meeting the above requirements.

Other existing standards developed for digital content broadcasting include a set of open standards developed and maintained by the DVB project and published by the European Telecommunications Standards Institute (hereinafter also referred to as "ETSI"). As one of these standards, ETSI EN 302 755 V1.3.1 ("Digital Video Broadcasting (DVB); Frame structure channel coding and modulation for a second generation digital terrestrial television broadcasting system (DVB-T2)") and Technical Specification ETSI TS 10 There is DVB-T2, a standard disclosed in several documents including 831 V1.2.1 (“Digital Video Broadcasting (DVB); Implementation guidelines for a second generation digital terrestrial television broadcastin system (DVB-T2)”).

In DVB-T2, data is transmitted in a frame structure as schematically shown in FIG. At a higher level, the frame structure includes super-frames 101a-c that are divided into multiple T2-frames 103a-d. Each T2-frame 103a-d is again partitioned into OFDM symbols, comprising a number of preamble symbols 105, 107a-c followed by a number of data symbols 109a-e. In T2-frames 103a-d , preamble symbols 105 , 107a-c include a single P1 preamble symbol followed by one or more P2 preamble symbols 107a-c .

The P1 symbol 105 located at the beginning of the T2 frame 103a-d is the S1 signaling used to identify the format of the P2 symbols 107a-c and the S2 used to signal certain basic transmission parameters. It carries 7 bits for signaling including signaling. P2 symbols 107a-c immediately following P1 symbol 105 are used for frequency and timing synchronization and channel estimation enhancement. P2 symbols 107a-c carry L1 signaling information, and also carry data. L1 signaling is divided into L1-pre signaling and L1-post signaling. The L1-pre signaling includes basic information about the T2 frame structure 100 and enables reception and decoding of the L1-post signaling. L1-post signaling provides enough information for the receiver to decode Physical Layer Pipes (hereinafter also referred to as “PLPs”) within the T2-frame carrying data.

Service data (eg, in the form of at least one MPEG-2 transport stream) may be divided into at least one data stream and transmitted in the form of PLP. Each PLP is a logical channel and may transmit one or more services.

A procedure in which information is mapped to the T2 frames 103a-d will be briefly described below.

As follows, a modulation value for one OFDM carrier during one OFDM symbol (eg, one constellation point) may be referred to as an OFDM cell. An OFDM cell corresponding to data (eg, PLP data) may be called a data cell, and an OFDM cell corresponding to signaling may be called a signaling cell. OFDM cells corresponding to L1 signaling (L1-pre and L1-post) may be referred to as L1 signaling cells.

Carriers of OFDM symbols that form T2 frames 103a-d can be seen as forming grid cells 200 as shown in FIG. 2 . The grid cells 200 corresponding to different carriers of the same OFDM symbol may be arranged in the same column (eg, cells corresponding to carriers of increasing frequencies arranged from top to bottom), and The grid cells 200 corresponding to carriers having the same carrier frequency may be arranged in rows (eg, cells corresponding to OFDM symbols in a time order arranged from left to right).

Information (including signaling and data) may be mapped to symbols of T2 frames 103a-d. This process can be seen as mapping OFDM cells (including signaling cells and data cells) to the grid cell 200 of the above-described type.

For example, the S1 and S2 signaling bits are mapped to cells of the P1 symbol 205 . Next, the L1 signaling cell is mapped to the cells of the P2 symbols 207a-c in a row-by-row zigzag form so that the L1 signaling cell fills the rows of the P2 symbols 207a-c before proceeding to the next row. After the L1 signaling cell is mapped to the cell of the P2 symbol 207a-c, the remaining active cells (eg, except for the cell used for the pilot signal) of the P2 symbol 207a-c and the following data symbols (209a-e) are used to transmit PLP data in a non-zigzag form.

In a digital broadcasting system, in order to recognize and properly decode a received signal, it is first necessary to perform synchronization. Synchronization allows the receiver to identify the presence of a frame in the received signal and identify the start of a frame. Also, at least one system parameter value needs to be signaled at the transmitter to help the receiver decode the signal. Detection, synchronization and information signaling are usually provided in the preamble portion of the received signal. For example, in DVB-T2 synchronization and signaling can be achieved using P1 and P2 symbols 105, 107a-c.

A technique for transmitting and receiving additional data in an existing or future frame structure is required. For example, in existing and next-generation digital broadcasting systems, eg, Digital Video Broadcasting (DVB) projects and/or Advanced Television Systems Committee (ATSC) (eg ATSC 3.0 standard), at least one addition in the frame structure A technique is required to provide a data channel.

SUMMARY OF THE INVENTION The present invention has been made in accordance with the above-mentioned necessity, and an object of the present invention is to provide a method and an apparatus for transmitting and receiving information in a frame structure according to existing and next-generation digital broadcasting systems.

In order to achieve the above object, a method for transmitting information according to an embodiment of the present invention includes mapping signaling information to at least one preamble symbol of a first frame, and mapping data to at least one of the first frame. mapping to a data symbol, dividing the additional information into at least two parts, mapping a first part of the additional information to at least one preamble symbol of the first frame, and a second part of the additional information mapping to at least one of (i) at least one data symbol of the first frame and (ii) at least one preamble symbol of the first frame; and transmitting the frame.

Also, the dividing of the additional information includes dividing the additional information into two parts, and the mapping of the additional information into first and second parts includes: the first part of the additional information and mapping the second part of the additional information to at least one preamble symbol of the first frame and mapping the second part of the additional information to at least one data symbol of the first frame.

In addition, the dividing the additional information includes dividing the additional information into N parts, and the dividing the additional information into first and second parts includes dividing each of the N parts of the additional information into the first and second parts. and mapping each of the N frames to at least one preamble symbol, wherein the k (k = 1, 2, ..., N) th part of the side information may be mapped to at least one preamble symbol of the k th frame. have.

In addition, the mapping of the first and second parts of the additional information may include mapping at least one part of the additional information other than the k-th part to at least one of the k (k=1, 2, ..., N)-th frame. It may include the step of mapping to the data symbol of.

In addition, the mapping of the first and second parts of the additional information includes mapping all parts of the additional information other than the k-th part to at least one data of the k (k=1, 2, ..., N)-th frame. It may include the step of mapping to a symbol.

In addition, the part of the additional information mapped to the at least one data symbol of the k-th frame may be mapped to the at least one data symbol in a cyclic order.

In addition, the mapping of the first and second parts of the additional information may include mapping the variable part of the additional information to at least one preamble symbol.

The method may further include selecting at least one transmission parameter for at least one of the signaling information and the side information so that the preamble symbol provides a capacity for both the signaling information and the side information.

In addition, the transmission parameter may include at least one of a puncturing rate and a modulation order.

In addition, the transmission parameter may be selected such that transmission performance of the signaling information is equal to or greater than a first threshold value.

Also, the transmission parameter may be selected such that transmission performance of the additional information is equal to or greater than a second threshold value.

In addition, the step of mapping the first and second parts of the additional information may include mapping the additional information to an unused cell of at least one preamble symbol remaining unused after mapping of the signaling information. .

In addition, the mapping of the additional information to the first and second parts includes: (i) mapping the additional information so that the additional information is mapped to all unused cells; and (ii) mapping the additional information to only a part of the unused cells. It may include at least one of the step of mapping the additional information to be possible.

Also, the additional information may include at least one additional channel.

In addition, the preamble symbol may include a P2 symbol, and the signaling information may include L1-pre signaling and L1-post signaling.

In addition, the signaling information may include at least one of the following information.

- Information indicating which part of the additional information is mapped to the preamble symbol of the frame

- Information indicating which part of the additional information is mapped to the data symbol of the frame

- Information indicating the length of the additional information

- Information indicating the number of parts of the additional information

- Information indicating the length of at least one part of the additional information

- Information indicating whether a specific part of the additional information is mapped to a preamble symbol of a frame

- Information indicating whether a specific part of the additional information is mapped to a data symbol of a frame

- Information indicating the length of the variable part of the additional information

- Information indicating the importance of the additional information

Meanwhile, a method for transmitting information according to another embodiment of the present invention includes mapping signaling information to at least one preamble symbol of a first frame, and mapping additional information to at least one preamble symbol of the first frame and mapping data to at least one data symbol of the first frame, wherein the mapping of the signaling information and the side information comprises: wherein the preamble symbol is used for both the signaling information and the side information. and selecting at least one transmission parameter for at least one of the signaling information and the side information to provide the capacity.

In addition, an apparatus for transmitting information according to an embodiment of the present invention receives signaling information and data, maps the signaling information to at least one preamble symbol of a first frame, and maps the data to the first frame a mapper that maps to at least one data symbol of a part is mapped to at least one preamble symbol of the first frame, and a second part of the side information is mapped to (i) at least one data symbol of the first frame and (ii) at least one preamble symbol of a second frame. , may be mapped to at least one of .

In addition, the preamble symbol may further include a transmission parameter selector that selects at least one transmission parameter for at least one of the signaling information and the side information so that the preamble symbol provides a capacity for both the signaling information and the side information. .

In addition, the method for receiving information according to an embodiment of the present invention includes the steps of: receiving at least one frame; de-mapping signaling information from at least one preamble symbol of a first frame; demapping data from one data symbol, demapping a first part of side information from at least one preamble symbol of the first frame, and (i) at least one data symbol of the first frame and and (ii) demapping the second part of the side information from at least one of at least one preamble symbol of a second frame.

On the other hand, the apparatus for receiving information according to an embodiment of the present invention, a receiver receiving at least one frame, demapping signaling information from at least one preamble symbol of a first frame, and at least one of the first frame demapping data from data symbols of the first frame, demapping a first part of side information from at least one preamble symbol of and a demapper for demapping the second part of the additional information from at least one of at least one preamble symbol of 2 frames, and a combiner for combining the parts of the additional information.

According to the above-described embodiments, it is possible to efficiently transmit information in a frame structure according to the existing and next-generation digital broadcasting systems.

1 shows a frame structure in DVB-T2.
2 shows a grid cell comprising carriers of OFDM symbols forming a T2 frame.
3 to 10 show configurations of mapping different types of information to cells of a frame structure according to various embodiments of the present disclosure.
11 illustrates a method for transmitting information according to an embodiment of the present invention.
12 shows an apparatus for transmitting information according to an embodiment of the present invention.
13 illustrates a method for receiving information according to an embodiment of the present invention.
14 illustrates an apparatus for receiving information according to an embodiment of the present invention.
15 illustrates a system including a transmitting apparatus and a receiving apparatus according to an embodiment of the present invention.

With reference to the accompanying drawings, the following description of embodiments of the present invention is provided to help the comprehensive understanding of the present invention defined in the claims. This description contains various details to aid this understanding, but these should be considered as illustrative only. Accordingly, it will be understood by those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the spirit of the present invention.

Identical or similar elements may be designated by the same or similar reference numbers, although they may also be illustrated in different drawings.

Detailed descriptions of techniques, structures, configurations, functions, or processes that are already known in the art may be omitted for clarity and brevity in order to avoid obscuring the subject matter of the present invention.

The terms and words used in this specification are not limited to a bibliographical meaning or a standard meaning, and may only be used by the inventor of the present invention for a clearer and concise understanding of the present invention.

Throughout the description and claims of this specification, the word "comprises" and variations thereof mean "including, but not limited to," and other features, elements, components, integers, steps, It is not intended to exclude processes, functions, etc.

A feature, element, component, integer, step, process, function, etc., disclosed in connection with a particular aspect, implementation, embodiment or claim of the present invention is not particularly compatible with any other aspect, implementation, etc. disclosed herein. , examples or claims.

The inventors have found that certain aspects of DVB-T2 and DVB-C2, including the synchronization capability of DVB-T2 and the single-type preamble structure of DVB-C2, are potentially advantageous in the design of the preamble structure used in ATSC 3.0. understand that A specific embodiment of the present invention aims at combining the devices of DVB-T2 and DVB-C2 and adopting them for ATSC 3.0. However, those skilled in the art will understand that the present invention is not limited to a DVB-T2 or DVB-C2 type preamble structure, and that various embodiments may be based on any suitable type of preamble structure.

Embodiments of the present invention may be, for example, mobile/portable terminals (eg, mobile phones, etc.), hand-held devices, personal computers, digital television and/or digital radio broadcast transmitter and/or receiver devices, set-top boxes. It may be implemented in any suitable method, system, and/or apparatus used in digital broadcasting, such as in the form of, etc. Any such system and/or apparatus may be compatible with any suitable existing or future digital broadcast system and/or standard, such as, for example, one or more digital broadcast systems and/or standards referenced herein. .

A specific embodiment of the present invention may be implemented in the form of a system including a transmitting-side device and a receiving-side device. The transmitting device may be implemented to generate at least one frame and transmit a signal corresponding to the frame to the receiver. The receiving device may be implemented to receive the signal, extract information included in the frame, and perform further decoding and/or processing operations. A specific embodiment may be implemented as a transmitting-side device, a receiving-side device, or a system including both the transmitting-side device and the receiving-side device.

The frames disclosed herein may be generated and transmitted using any suitable method comprising generating and transmitting the frames or apparatus and/or systems comprising means for generating and transmitting the frames. A frame disclosed herein is received using a suitable method comprising receiving the frame and extracting information or an apparatus and/or system comprising means for receiving the frame and extracting the information, wherein the information is extracted can be The methods disclosed herein may be embodied in any suitably arranged apparatus and/or system comprising means for performing the methods.

The frame structure according to an embodiment of the present invention includes a preamble part (portion) (or zone) and a data part (portion) (or zone). The frame structure may include at least one other portion (or zone). Embodiments of the present invention generally do not limit the various portions to a specific order, although the frameable portion is placed before the data portion. In an embodiment, the preamble part may be the first part of the preamble structure. However, in another embodiment, at least one portion may be disposed in front of the preamble portion. For example, the frame structure may include a guard interval (or zone) at the front end of the preamble part.

In the embodiment described below, the preamble part is used to transmit the synchronization sequence and signaling. However, one of ordinary skill in the art will appreciate that the preamble portion may be used to transmit any suitable type of information.

In addition, in the embodiments described below, the preamble part and the data part of each frame may include at least one symbol. However, one of ordinary skill in the art will appreciate that the preamble portion and data portion of a frame may include entities that transmit other suitable types of information. The term cell, for example, an OFDM cell, may be used as a predetermined information unit (eg, basic information unit). “Symbol” For example, an OFDM symbol may include at least one cell.

As described above, the frame structure may include at least one preamble symbol for transmitting signaling and at least one data symbol for transmitting data. Each symbol may include at least one cell. In the following example, the preamble symbol includes P2 type symbols for transmitting L1-pre and L1-post type signaling, and the data symbol is used to transmit data in the form of a PLP type channel. For example, the P2 symbol may be an 8K Orthogonal Frequency Division Multiplexing (OFDM) symbol and may be coded using a 16K Low Density Parity Check (LDPC) code. The data symbol may be, for example, a 32K OFDM symbol and may be coded using a 64K LDPC code. However, it will be understood by those skilled in the art that the present invention is not limited to these specific examples. For example, the present invention is not limited to a P2 symbol for transmitting L1-pre and L1-post signaling or a data symbol for transmitting data in a PLP format. In addition, the present invention is not limited to OFDM symbols. For example, a symbol may include a multi-carrier (or multi-cell) symbol and/or a single-carrier (or single cell) symbol of an appropriate type.

In certain embodiments, use of the entire capacity of preamble symbols (eg, P2 symbols) for transmitting signaling (eg, L1-pre and L1-post signaling) is not always required. For example, limiting to the lowest efficient coding rate, eg, 0.3, may generate or increase extra capacity in the preamble symbol. In addition, the use of a predetermined modulation technique (eg, Non-Uniform Quadrature Amplitude Modulation (NUQAM)) may generate or increase additional capacity for an additional channel. In this case, the redundant capacity of the P2 symbol (eg, For example, the remaining cells or unused cells may be used to transmit additional data For example, the extra capacity is used to transmit at least one additional channel (eg, common channels). can be used

An additional channel transmitted using the P2 symbol may include predetermined information addressed to a plurality of users, eg, all users (not normally in the case of data transmitted in a PLP). The presence of certain additional channels may be signaled, for example, in L1-pre or L1-post signaling transmitted by P2 symbols. An additional channel transmitted using the P2 symbol may use the same or different modulation and coding technique as the signaling transmitted by the P2 symbol.

For example, the additional channel may include a Fast Information Channel (FIC) and an Emergency Alert Channel (EAC). The FIC is a dedicated channel for transmitting cross-layer information that enables fast service acquisition and channel scanning. For example, information transmitted by the FIC includes (i) channel binding information between PLPs, (ii) ID and service number information of a broadcaster, and (iii) a service of each broadcaster. The EAC is used to transmit emergency messages or is linked to a PLP that transmits emergency messages.

In a specific embodiment, 6868 P2 cells are available and 2128 cells are used for L1-pre signaling. By fixing the L1-post effective coding rate (eg, 1/3), the number of cells used for L1-post signaling can be calculated as follows.

Cell_Post = ((Ksig_L1post + 168)*3.33)/Nmod_L1post

Such an equation provides the number of cells required in a given embodiment to transmit L1-post signaling. Ksig_L1post indicates the number of bits of L1-post before encoding, and Nmod_L1post indicates the constellation size (or order) used for L1-post. For example, Nmod_L1post=1 for BPSK or 2-QPSK and Nmod_L1post=4 for 16-QAM. The value 168 is a postfix added as L1-post.

In this case, the number of remaining cells (6868-2128-Cell_Post) may be used for the additional channel. For example, in the case of Ksig_L1post=2000 and Nmod_L1post=4, 185 cells may be used for L1-post signaling, and the remaining 2935 cells may be used for additional channels.

In some cases, the extra capacity in the P2 symbol of one frame may not be sufficient to transmit a desired amount of additional data. For example, the data to be transmitted in the above-described embodiment may be larger than the capacity of 2931 unused cells available. In an embodiment of the present invention, such a problem will be described.

An embodiment of the present invention may be applied to a receiver operating in various modes. For example, when operating in the full mode of operation, the receiver operates to receive both P2 symbols and data symbols. In addition, in order to save power when operating in the P2 monitoring mode, at least one component is powered down so that the receiver receives the P2 symbol but does not receive the data symbol. Those skilled in the art will appreciate that the present invention is not limited to these specific modes.

In some embodiments, at least one transmission parameter of the P2 symbol may be adjusted so that the signaling and the additional channel are transmitted in the P2 symbol. For example, a transmission parameter may be modified for both signaling information (eg, L1-post signaling) and an additional channel.

In an embodiment, it may be desirable to maintain a certain level of performance (eg, Bit Error Rate (BER) or Signal-to-Noise Ratio (SNR)) in relation to signaling information. Accordingly, the transmission parameters used in the cell for signaling information may be selected to achieve a desired level of performance (eg, by using a relatively low puncturing rate and/or a relatively low modulation order). The transmission parameters used in the cell for the additional channel may be selected to ensure that a certain amount of data can be transmitted with the redundant capacity of the P2 symbol.

In one embodiment, if the transmission parameters for the cell for signaling information are selected to achieve the maximum possible performance with respect to the additional channel, the performance (e.g., An optimal possible transmission parameter (with respect to the minimum possible puncturing rate and/or the minimum possible modulation order) may be selected for the additional channel.

3 illustrates a method of mapping different types of information to cells of a frame structure according to an embodiment of the present invention. According to FIG. 3 , each frame 300 includes at least one P2 symbol 301 and at least one data symbol 303 . Each symbol includes at least one cell (not shown). Synchronization sequence 305, L1-pre signaling 307 and L1-post signaling 309 are mapped to a cell of P2 symbol 301, that is, P2 symbol 301, and data 311 is data symbol 303, i.e. , is mapped to the cell of the data symbol 303 . The P2 symbol 305 may also contain an amount of extra capacity 313 , ie unused cells, that may be used for at least one additional channel.

L1-post signaling is mapped to P2 symbols before mapping of additional channels. When the capacity for transmitting the additional channel in the P2 symbol is not sufficient after the synchronization sequence, mapping of the L1-pre signaling and the L1-post signaling, at least one transmission parameter for the L1-post signaling can efficiently use the available capacity can be modified to increase For example, if possible, the transmission parameter may be modified so that the available capacity in the P2 symbol of a single frame for transmitting the additional channel is sufficient. For example, the puncturing rate and modulation order may be increased. The transmission parameters may be modified under the constraint of a requirement that the performance of the L1-post signaling is sufficiently high and that at least a certain minimum level of performance (eg, Quality of Service (QoS)) for the additional channel can be maintained.

The length of the L1-post signaling may be indicated in the signaling part of the frame (eg, L1-pre signaling). The value of the transmission parameter (eg, puncturing rate and modulation order) and the length of the additional channel may also be indicated in the signaling part of the frame (eg, L1-pre signaling). In some cases, certain values may be inferred from other values. For example, one of three parameters (i) additional channel, (ii) puncturing rate and (iii) modulation order can be inferred from the other two parameters. In this case, a set of values from which all values are inferred may be signaled.

In a corresponding embodiment, since all information transmitted by the additional channel is included in the P2 symbol of a single frame, the additional channel may be received by a receiver operating in both the full operation mode and the P2 monitoring mode. In addition, information transmitted by the additional channel may be received within one frame.

A certain level of performance can be maintained for L1-post signaling by selecting appropriate transmission parameters for L1-post signaling 309 . In addition, the transmission parameters used for the additional channel are such that the information transmitted by the additional channel fits within the available redundant capacity 313 of a single frame 300, and a predetermined minimum level of performance for the additional channel can be maintained. chosen to be

4 to 10 show configurations of mapping different types of information to cells of a frame structure according to various embodiments of the present disclosure. Similar to the embodiment shown in FIG. 3 , in each of the embodiments shown in FIGS. 4 to 10 , each frame includes at least one P2 symbol and at least one data symbol. The synchronization sequence, L1-pre signaling and L1-post signaling are mapped to P2 symbols, and data is mapped to data symbols. The P2 symbol also includes a certain amount of extra capacity that can be used for at least one additional channel.

4 to 10, information transmitted by the additional channel is divided into at least one part. The first part of the information is mapped to the spare capacity of the P2 symbols of the first frame, and the remaining parts are (i) the spare capacity of the P2 symbols of at least one subsequent frame and (ii) the first frame and/or at least one of the following. It is mapped to at least one of the data symbols of the frame. In this embodiment, since information transmitted by the additional channel does not have to fit the extra capacity of the P2 symbol of a single frame, at least one transmission parameter may be selected for the additional channel to achieve a certain level of performance. have. For example, the puncturing rate and modulation order may be selected to be higher than predetermined respective values. A person skilled in the art will understand that the present invention is not limited to the specific examples shown in Figs.

In some embodiments, information of various parts transmitted by an additional channel may all have the same size. However, in other embodiments, at least some parts may be of different sizes.

Hereinafter, information of different parts transmitted by the additional information may be labeled as “first part”, “second part”, etc. for classification. However, one of ordinary skill in the art will appreciate that the different parts may occur in any suitable order in the original information. For example, the “first part” in the original information may occur before or after the “second part”. Also, hereinafter, different frames may be labeled as “first frame”, “second frame”, etc. to distinguish them. However, one of ordinary skill in the art will appreciate that the different frames may occur in any suitable order. For example, “first frame” may occur before or after “second frame”.

In the embodiment shown in FIG. 4 , the synchronization sequence, L1-pre signaling, and L1-post signaling may be mapped to P2 symbols. At this time, the information transmitted by the additional channel may be divided into N parts (eg, N=2, 3, 4,...), where each part is a synchronization sequence, L1-pre signaling and L1 After mapping of -post signaling, it has a size not greater than the extra capacity of the P2 symbol of a single frame. Each part is mapped to an extra P2 symbol in each of a different frame (eg, a continuous frame) shown as a shaded area in FIG. 4 . A counter may be provided in the signaling part of the frame (eg, L1-pre signaling) to indicate which information part is transmitted in each frame.

In this embodiment, since the additional channel is mapped only to the P2 symbol, the receiver operating in both the full operation mode and the P2 monitoring mode may receive the additional channel. However, since the information transmitted by the additional channel is spread over N frames, receiving the complete information transmitted by the additional channel may be delayed by N frames.

In the embodiment shown in FIG. 5 , the synchronization sequence, L1-pre signaling, and L1-post signaling are mapped to P2 symbols. The information to be transmitted by the supplemental channel is divided into two parts. The first part has a size not greater than the extra capacity of the P2 symbol of a single frame after mapping the synchronization sequence, L1-pre signaling and L1-post signaling. The second part contains the rest of the information. The first part is mapped to a spare P2 symbol of a given frame, and the second part is mapped to at least one data symbol of the same frame. For example, the information may be mapped to data symbols in the form of a type 1 PLP. The length of the additional channel may be indicated in the signaling part of the frame (eg, L1-pre signaling).

In this embodiment, since the additional channels are mapped to both P2 symbols and data symbols, a receiver operating in P2 monitoring mode will not be available to receive the additional channels. However, the receiver operating in the full operation mode may be able to receive the additional channel within a single frame that minimizes the delay.

In the embodiment shown in FIG. 6 , the synchronization sequence, L1-pre signaling, and L1-post signaling are mapped to P2 symbols. At this time, the information to be transmitted by the additional channel is divided into two parts. The first and second parts have a size not greater than the extra capacity of the P2 symbol of a single frame after mapping the synchronization sequence, L1-pre signaling and L1-post signaling, respectively. The first part is mapped to the redundant P2 symbols of the first frame, and the second part is mapped to at least one data symbol of the same frame. Further, the second part is mapped to the extra second symbol of the second frame (eg, the frame immediately following the first frame), and the first part is mapped to at least one data symbol of the same frame. The order of parts within a frame may be indicated in a signaling part (eg, L1-pre signaling) of the frame.

In this embodiment, the information to be transmitted by the additional channel is mapped to both the P2 symbol and the data symbol. However, since complete information is mapped to P2 symbols of successive frames, a receiver operating in P2 monitoring mode can receive an additional channel even when two frame delays exist. On the other hand, since complete information is also mapped to P2 symbols and data symbols in the same frame, it is possible for a receiver operating in full operation mode to receive additional channels within a single frame with minimal delay.

In the embodiment shown in FIG. 7 , the synchronization sequence, L1-pre signaling, and L1-post signaling are mapped to P2 symbols. Information to be transmitted by the additional channel is divided into N parts (eg, N=2, 3, 4,...). In the example shown in FIG. 7, N=3, and the embodiment shown in FIG. 6 may be regarded as a case where N=2.

Each part has a size not greater than the extra capacity of the P2 symbol of a single frame after mapping the synchronization sequence, L1-pre signaling and L1-post signaling. The number of N parts may be given by _{N=ceil[N cells} /N _{P2 _ ADD _ CH ].} Here, N _cells is the total number of cells required to transmit additional channel information, N _{P2 _ ADD _ CH} is the total number of redundant cells in the P2 symbol of a single frame, and ceil is a cell operator. In this case, the length of the first N-1 parts is N _{P2 _ ADD _ CH} , and the length of the N-th part will be less than or equal to _{N P2 _ ADD _ CH.} If the length of the second part is smaller than N N _{P2 ADD _ _ CH,} there is a padding may be used to increase the length of _{P2 _} N _{_ CH ADD.} Or, for example, padding may be omitted by indicating the length of the N-th part in the signaling part (eg, L1-pre signaling) of the frame.

The N-th parts are each mapped to the redundant P2 symbols of the N frames. For example, the k-th part may be mapped to an extra P2 symbol of the k-th frame. The number of parts mapped to P2 symbols in a given frame may be indicated in a signaling part (eg, L1-pre signaling) of the corresponding frame. In addition, in each frame, parts other than the part mapped to the P2 symbol are mapped to the data symbol of the same frame. For example, in the k-th frame (k=1, 2,... N), parts other than the k-th frame part are [k+1, k+2,... N, 1, 2,... k -1], and may be mapped to data symbols in a cyclic order.

In a corresponding embodiment, the receiver operating in the P2 monitoring mode may receive an additional channel having N frame delays, and the receiver operating in the full operation mode may receive the additional channel in a single frame.

8 and 9 show a further embodiment. In corresponding embodiments, information to be transmitted by the additional channel is divided into N parts. In the embodiment shown in FIG. 8, N=3, and in the embodiment shown in FIG. 9, N=4. As in the embodiment shown in FIG. 7 , in the embodiment shown in FIGS. 8 and 9 , the k-th part (k=1, 2, ... N) is mapped to the extra P2 symbol of the k-th frame. However, unlike the embodiment shown in FIG. 7 , the data symbol of the k-th frame does not transmit all the remaining parts (ie, all parts except for the k-th part), and only a subset of the remaining parts is transmitted. For example, in the embodiment shown in FIG. 8 , one of the two remaining parts is mapped to a data symbol of the kth frame, and in the embodiment shown in FIG. 9 , two of the three remaining parts are the kth frame is mapped to the data symbol of However, in each of the embodiments shown in FIGS. 8 and 9 , all parts may occur at least once in two consecutive frames.

8 and 9, the receiver operating in the P2 monitoring mode may receive an additional channel having 3 frame delays (the embodiment of FIG. 8) or 4 frame delays (the embodiment of FIG. 9). and a receiver operating in the full operation mode may receive an additional channel with two frame delays. Although the embodiments shown in Figs. 8 and 9 generate a larger reception delay for a receiver operating in the full operation mode compared to the embodiment shown in Fig. 7, the transmission redundancy is shown in Fig. 7 It is reduced in the embodiments shown in Figs. 8 and 9 compared to the embodiment shown.

According to a certain embodiment, information to be transmitted by the additional channel may be divided into N parts, and the N parts are (i) of parts mapped to P2 symbols of _{N 1} (N _{1 ≤ N) consecutive frames.} P2 symbols and data symbols of a frame, such that the set includes each of the N parts at least once and (ii) _{the data symbols of N 2} (N ₂ <N _{1 ) consecutive frames include each of the N parts at least once} can be mapped to Under these conditions, a receiver operating in P2 monitoring mode _{will receive an additional channel with N 1} -frame delay, whereas a receiver operating in full operating mode will receive an additional channel with (shorter) N ₂ -frame delay. can The mapping may be adjusted to strike a balance between transmit redundancy and receive delay. 6 to 9 show various embodiments.

In another embodiment, the N parts are mapped to P2 symbols in N consecutive frames (allowing a receiver operating in P2 monitoring mode to receive an additional channel with an N-frame delay). In addition, in one of the N frames (eg, the first frame), one of the parts (eg, the first part) is mapped to a P2 symbol, and the remaining N-1 parts (eg, the receiver operating in the full operation mode is single data symbols of the same frame (allowing additional channels to be received in the frame). However, in all other N-1 frames, one of the parts is mapped to a P2 symbol, but no part is mapped to a data symbol (to reduce transmission redundancy).

In some embodiments, the additional channel may include a variable channel (eg, variable FIC). In this case, the system can be configured such that only the variable channel changes in each super frame. In this case, frame mapping of information may be performed according to an appropriate embodiment, for example, the embodiments described above with reference to FIGS. 3 to 10 .

Alternatively, the additional channel may be mapped such that the variable channel is always mapped to the P2 symbol. In this case, mapping of other channels may be performed according to an appropriate embodiment, for example, the embodiment described above with reference to FIGS. 3 to 10 . For example, as shown in FIG. 10 , the variable channel may be first mapped to the P2 symbol before other channels are mapped to the P2 symbol and the data symbol in a similar manner to the embodiment shown in FIG. 7 . In this way, the receiver operating in the full mode of operation and the P2 monitoring mode can receive variable channels.

A person skilled in the art will know that the technique described above with respect to FIG. 3 (eg, a technique for modifying transmission parameters to increase the available capacity in the preamble portion of the frame) is different from the technique described above with respect to other techniques, for example FIGS. 4 to 10 . It will be appreciated that it may be applied in combination with one technique.

In the above-described embodiment, appropriate or required signaling may be provided in a frame (eg, L1-pre signaling and/or L1-post signaling). For example, in some embodiments, the following signaling field may be provided.

- CH_ADD_ACTIVE: 1-bit field indicating the presence of FIC

- CH_ADD: indicates the length of the additional channel Ksig

- CH_ADD_MOD_POST: 1-bit field

- N: the number of parts into which the additional channel is divided

- SLICE_LEN: indicates the length of each part of the additional channel

- A field indicating which part of an additional channel is mapped to a P2 symbol in a predetermined frame

- CH_ADD_MODE: indicates whether the additional channel is mapped to only P2 symbols or to both P2 symbols and data symbols

- A field indicating the length of the variable part of the additional channel (eg, variable channel)

In some embodiments, a waking up mechanism may be provided. For example, the receiver operating in the P2 monitoring mode is woken up (eg, switched in the full operation mode) when it is determined that the message transmitted by the additional channel provided in the P2 symbol is important. For example, a flag indicating the importance of information transmitted by the additional channel may be provided in the signaling part of the frame.

In some embodiments, each additional channel may be treated as a separate block for LDPC coding. However, when the length of the additional channel is relatively short, the corresponding LDPC performance may deteriorate. Accordingly, in another embodiment, at least two additional channels (eg, FIC + EAC + other additional channels) may be considered to form a single block to which LDPC coding is applied. By increasing the length of the LDPC coding block, the most robust LDPC coding can be achieved.

In the above-described embodiment, the part of the additional channel mapped to the P2 symbol is equal to the total length of the redundant capacity available in the P2 symbol. That is, the entire redundant capacity of the P2 symbol is used to transmit the additional channel. However, in another embodiment, not all of the extra capacity available in the P2 symbol is used to transmit the additional channel. For example, the part of the additional channel mapped to the P2 symbol may be smaller than the total capacity available in the P2 symbol. The total number of parts into which the additional channel is divided may be increased if necessary. The remaining capacity in the P2 symbol may be filled with other information or signaling, for example, another channel.

11 illustrates a method 1100 according to an embodiment for transmitting information. In a first step 1101, signaling information is mapped to at least one preamble symbol of a first frame. The signaling information may include an appropriate type of signaling, for example, signaling information as described above. In a next step 1103, data is mapped to at least one data symbol of the first frame. The data may include any suitable type of data, for example, broadcast data in the form of PLPs. The data may be generated from, or received from, any suitable type of data generation source. In the next step 1105, the additional information may be divided into at least two parts. The additional information may include an appropriate type of information, for example, at least one additional channel. In a next step 1107, the first part of the additional information is mapped to at least one preamble symbol of the first frame. In a next step 1109, the second part of the additional information is mapped to at least one of (i) at least one data symbol of the first frame and (ii) at least one preamble symbol of the second frame. The segmentation and mapping in steps 1105 , 1107 , 1109 includes segmentation and mapping according to the above-described technique, for example, the technique described with reference to FIGS. 3 to 10 . In the next step 1111 the frame is transmitted. A person skilled in the art will understand that the steps of the method shown in FIG. 11 may be executed in any suitable order.

12 shows an apparatus 1200 for transmitting information according to an embodiment. Device 1200 may be configured to implement at least one of the methods described above. The device 1200 includes a mapper 1201 , a divider 1203 , and a transmitter 1205 . The mapper 1201 is configured to receive the signaling information and data, map the signaling information to at least one preamble symbol of a first frame, and map the data to at least one data symbol of a first frame. The divider 1203 is configured to receive the additional information, divide the additional information into at least two parts, and output the part of the additional information to the mapper 1201 . The mapper 1201 maps the first part of the additional information to at least one preamble symbol of the first frame, and maps the second part of the additional information to (i) at least one data symbol of the first frame and (ii) at least one of the second frame. is configured to map to at least one of the preamble symbols of Partitioning and mapping may include partitioning and mapping according to the techniques described above, for example those described with reference to FIGS. 3 to 10 . In addition, the mapper 1201 is configured to output the generated frames to the transmitter 1205 . The transmitter 1205 is configured to receive a frame from the mapper 1201 and transmit the frame.

In addition, the apparatus additionally includes a transmission parameter selector (not shown) for selecting at least one transmission parameter for at least one of the signaling information and the additional information so that the preamble symbol provides a capacity for both the signaling information and the additional information. may include

A transmitting-side device may generate and transmit information according to the above-described technique, and a receiving-side device may be provided to receive a transmitted frame and extract signaling, data, and additional information included in the received frame.

13 illustrates a method 1300 according to an embodiment for receiving information, which corresponds to the transmission method illustrated in FIG. 11 . At least one frame is received in a first step 1301 . In a next step 1303, the signaling information is demapped into at least one preamble symbol of the first frame. In a next step 1305 data is demapped from at least one data symbol of the first frame. In a next step 1307, the first part of the side information is demapped from at least one preamble symbol of the first frame. In a next step 1309, the second part of the additional information is demapped from at least one of (i) at least one data symbol of the first frame and (ii) at least one preamble symbol of the second frame. In the next step 1311, parts of the additional information are combined to recover the additional information. Those skilled in the art will appreciate that the steps of the method shown in FIG. 13 may be performed in any suitable order.

FIG. 14 shows an apparatus 1400 according to an example for receiving information corresponding to the transmitting apparatus shown in FIG. 12 . The device 1400 includes a receiver 1401 , a demapper 1403 , and a combiner 1405 . The receiver 1401 is configured to receive at least one frame. The demapper 1403 is configured to demap signaling data from at least one preamble symbol of a first frame, demap data from at least one data symbol of a first frame, and output signaling information and data. The demapper 1403 demaps the first part of the side information from the at least one preamble symbol of the first frame, and at least one of (i) at least one data symbol of the first frame and (ii) at least one preamble symbol of the second frame. It may be configured to demap the second part of the additional information from one, and output the part of the additional information to the combiner 1405 . The combiner 1405 is configured to combine parts of the additional information received from the demapper 1403 to restore the additional information and output the additional information.

In the method shown in FIG. 13 or the apparatus shown in FIG. 14 , the signaling information may be used for de-mapping, for example, de-mapping of an additional information part.

15 shows an example of a system 1500 including a transmitting device 1501 and a receiving device 1503 . The transmitting apparatus 1501 may include the apparatus 1200 illustrated in FIG. 12 , and the receiving apparatus 1503 may include the apparatus 1400 illustrated in FIG. 14 .

It will be understood that the embodiments of the present invention may be implemented in the form of hardware, software, or a combination of hardware and software. Any such software may be stored in a form of volatile or non-volatile storage, such as, for example, a storage device such as a non-erasable or rewritable ROM, or in a form of memory, such as, for example, RAM, a memory chip, device or integrated circuit. stored, or on an optical or magnetic readable medium such as a CD, DVD, magnetic disk or magnetic tape.

It will be appreciated that storage devices and storage media are examples of machine-readable storage suitable for storing a program or programs comprising instructions that, when executed, embody a particular embodiment of the present invention. Accordingly, certain embodiments provide a program comprising code for implementing a method, apparatus, or system as claimed in any one of the claims herein, and machine-readable storage storing such a program. Moreover, such a program may be carried electrically over any medium, such as, for example, a communication signal carried over a wired or wireless connection, and suitable embodiments include them.

While the present invention has been shown and described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes may be made in form and detail without departing from the spirit of the invention as defined by the appended claims.

1501: transmitting device 1503: receiving device

Claims (21)

In the transmission method,
mapping signaling information to at least one preamble symbol of a first frame;
mapping data to at least one data symbol of the first frame;
dividing the additional information into at least two parts;
mapping the first part of the additional information to at least one preamble symbol of the first frame;
mapping the second part of the additional information to at least one preamble symbol of a second frame that is a subsequent frame of the first frame; and
Including; transmitting the first frame and the second frame;
The mapping of the signaling information to at least one preamble symbol of a first frame comprises:
Adjusting at least one of a puncturing rate and a modulation order based on a spare area of a preamble symbol for transmission of the side information after the mapping of the signaling information. delete According to claim 1,
The step of dividing the additional information into at least two parts comprises:
dividing the additional information into N parts;
The method is
It further comprises; mapping each of the N parts of the side information to at least one preamble symbol of each of the N frames;
A method characterized in that the k (k = 1, 2, ..., N) th part of the additional information is mapped to at least one preamble symbol of the k th frame. 4. The method of claim 3,
The step of mapping each of the N parts of the additional information to at least one preamble symbol of each of the N frames comprises:
and mapping at least one part of the additional information other than the k-th part to at least one data symbol of the k (k=1, 2, ..., N)-th frame. 5. The method of claim 4,
The step of mapping each of the N parts of the additional information to at least one preamble symbol of each of the N frames comprises:
and mapping all parts of the additional information other than the k-th part to at least one data symbol of the k (k=1, 2, ..., N)-th frame. 6. The method of claim 5,
The part of the additional information mapped to the at least one data symbol of the k-th frame is mapped to the at least one data symbol in a cyclic order. 7. The method of any one of claims 1, 3 to 6,
The method according to claim 1, wherein the variable part of the side information is mapped to at least one preamble symbol. 7. The method of any one of claims 1, 3 to 6,
The mapping of the signaling information to at least one preamble symbol of a first frame comprises:
and adjusting at least one of the puncturing rate and the modulation order such that the preamble symbol provides capacity for both the signaling information and the side information. delete 9. The method of claim 8,
At least one of the puncturing rate and the modulation order is selected such that transmission performance of the signaling information is equal to or greater than a first threshold value. 9. The method of claim 8,
At least one of the puncturing rate and the modulation order is selected such that transmission performance of the side information is equal to or greater than a second threshold value. 7. The method of any one of claims 1, 3 to 6,
The first part and the second part are mapped to unused cells of at least one preamble symbol remaining unused after mapping of the signaling information. 13. The method of claim 12,
The step of mapping the additional information to the first and second parts comprises:
(i) mapping the additional information so that the additional information is mapped to all unused cells; and (ii) mapping the additional information so that the additional information is mapped to only a part of the unused cells. Way. 7. The method of any one of claims 1, 3 to 6,
The additional information comprises at least one additional channel. 7. The method of any one of claims 1, 3 to 6,
The preamble symbol includes a P2 symbol, and the signaling information includes L1-pre signaling and L1-post signaling. 7. The method of any one of claims 1, 3 to 6,
The signaling information, a method characterized in that it includes at least one of the following information;
- Information indicating which part of the additional information is mapped to the preamble symbol of the frame
- Information indicating which part of the additional information is mapped to the data symbol of the frame
- Information indicating the length of the additional information
- Information indicating the number of parts of the additional information
- Information indicating the length of at least one part of the additional information
- Information indicating whether a specific part of the additional information is mapped to a preamble symbol of a frame
- Information indicating whether a specific part of the additional information is mapped to a data symbol of a frame
- Information indicating the length of the variable part of the additional information
- Information indicating the importance of the additional information delete In the transmitting device,
mapping signaling information to at least one preamble symbol of a first frame, mapping data to at least one data symbol of the first frame,
mapping a first part of the additional information to at least one preamble symbol of the first frame,
a mapper that maps the second part of the additional information to at least one preamble symbol of a second frame that is a frame subsequent to the first frame; and
a transmitter for transmitting the first frame and the second frame;
At least one of a puncturing rate and a modulation order is adjusted based on a spare region of a preamble symbol for transmission of the side information after the mapping of the signaling information. 19. The method of claim 18,
wherein at least one of the puncturing rate and the modulation order is adjusted such that the preamble symbol provides capacity for both the signaling information and the side information. In the receiving method,
receiving a first frame and a second frame that is a subsequent frame of the first frame;
demapping signaling information from at least one preamble symbol of the first frame, demapping data from at least one data symbol of the first frame, and generating additional information from at least one preamble symbol of the first frame demapping one part and demapping a second part of the side information from at least one preamble symbol of the second frame; and
combining the first and second parts of the additional information;
At least one of a puncturing rate and a modulation order is adjusted based on a spare area of a preamble symbol for transmission of the side information after the mapping of the signaling information. In the receiving device,
a receiver for receiving a first frame and a second frame that is a subsequent frame of the first frame;
demapping signaling information from at least one preamble symbol of the first frame, demapping data from at least one data symbol of the first frame, and generating additional information from at least one preamble symbol of the first frame 1 Demap the part,
a demapper for demapping a second part of the side information from at least one preamble symbol of the second frame; and
a combiner for combining the first and second parts of the additional information;
At least one of a puncturing rate and a modulation order is adjusted based on a spare region of a preamble symbol for transmission of the side information after the mapping of the signaling information.

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