KR20150005409A - transmitting apparatus and receiving apparatus and signal processing method thereof - Google Patents

Abstract

Disclosed is a transmitting apparatus. The transmitting apparatus includes: a frame generator configured to map data included in an input stream to at least one signal processing path to generate a frame; an information inserter configured to insert signaling information to a signaling region of the frame; and a transmitter configured to transmit the frame with the signaling information inserted therein. The signaling information includes input stream synchronizer (ISSY) mode information, receiver buffer size information required according to the ISSY mode information, and time information representing a time between a P1 symbol of a preset frame for transmitting user packets and an output of a preset bit of a first user packet among the user packets.

Description

TECHNICAL FIELD [0001] The present invention relates to a transmitting apparatus, a receiving apparatus, and a signal processing method therefor,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitting apparatus, a receiving apparatus, and a signal processing method thereof, and more particularly, to a transmitting apparatus, a receiving apparatus, and a signal method thereof for mapping data to at least one signal processing path for transmission.

Recently, broadcasting communication services are becoming multifunctional and broadband high quality. Particularly, with the development of electronic technology, the spread of mobile broadcasting devices such as high-definition digital TVs and high-end smartphones is increasing, and accordingly, there is a growing demand for various receiving methods and various services for broadcasting services.

In accordance with this demand, a broadcasting communication standard such as DVB-T2 (Digital Video Broadcasting Second Generation Terrestrial) has been developed as an example. DVB-T2 is a second-generation European terrestrial digital broadcasting standard that improves the performance of DVB-T, which is being adopted as a standard in more than 35 countries around the world including Europe. DVB- -T2 adopts the latest technologies such as LDPC (Low Density Parity Check) code and 256QAM modulation method to realize transmission capacity increase and high bandwidth efficiency, and thus it is possible to provide various high quality services such as HDTV in a limited bandwidth It has the advantage of being.

Meanwhile, the DVB-T2 includes information for ensuring a variable delay caused by data processing in the transmitting apparatus, and transmits the data frame itself in order to use the information in the header area of the transmission frame There was a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned needs, and it is an object of the present invention to provide a transmitting apparatus, a receiving apparatus, and a receiving apparatus for transmitting information included in signaling information for ensuring variable delay generated by data processing in a transmitting apparatus, And a control method.

According to an embodiment of the present invention, a transmitter includes a frame generator for generating a frame by mapping data included in an input stream to at least one signal processing path, a signal generator for generating signaling information in a signaling area of the frame, Wherein the signaling information includes ISSY (Input Stream Synchronizer) mode information, receiver buffer size information requested according to the ISSY mode information, Time information between a P1 symbol of a predetermined frame for transmitting a user packet and a time at which a predetermined bit of the first user packet of the user packet is outputted.

Here, the predetermined frame may be the first frame to which the interleaving frame for transmitting the user packet is mapped.

Wherein the signaling region includes a configurable field and a dynamic field, the configurable field includes the ISSY mode information, and the dynamic field includes a size of the receiver buffer size And the time information between a P1 symbol of a predetermined frame transmitting the user packet and a time at which a predetermined bit of the first user packet of the user packet is outputted.

In addition, the dynamic field may further include ISCR (Input Stream Clock Reference) information.

Also, the signaling information may include pre-signaling information and post signaling information, and the configurable field and the dynamic field may be included in the post-signaling information.

Also, the transmitting apparatus may be implemented as a DVB-T2 transmission system, and the signaling region of the frame may be an area for transmitting L1 signaling.

Also, the transmitting apparatus is implemented as a DVB-T2 transmission system, the receiver buffer size is BUFS (BUFFER Size), and the time information is TTO (Time To Output).

According to another aspect of the present invention, there is provided a receiving apparatus including a receiving unit for receiving a frame including signaling information and data mapped to at least one signal processing path, a signaling processing unit for extracting the signaling information from the received frame, And a signal processing unit for performing signal processing on data included in the frame based on the extracted signaling information, wherein the signal processing unit includes ISSY (Input Stream Synchronizer) mode information included in the signaling information, Can process the data based on the receiver buffer size information required and the time information between the P1 symbol of the predetermined frame transmitting the user packet and the time when the predetermined bit of the first user packet of the user packet is outputted have.

Here, the predetermined frame may be the first frame to which the interleaving frame for transmitting the user packet is mapped.

Wherein the signaling region includes a configurable field and a dynamic field, the configurable field includes the ISSY mode information, and the dynamic field includes a size of the receiver buffer size And the time information between a P1 symbol of a predetermined frame transmitting the user packet and a time at which a predetermined bit of the first user packet of the user packet is outputted.

In addition, the dynamic field may further include ISCR (Input Stream Clock Reference) information.

Also, the signaling information may include pre-signaling information and post signaling information, and the configurable field and the dynamic field may be included in the post-signaling information.

Also, the receiving apparatus may be implemented as a DVB-T2 receiving system, and the signaling region of the frame may be an area for transmitting L1 signaling.

Also, the receiving apparatus may be implemented as a DVB-T2 receiving system, the receiver buffer size may be BUFS (Buffer Size), and the time information may be a time to output (TTO).

According to another aspect of the present invention, there is provided a signal processing method for a transmission apparatus, including: generating a frame by mapping data included in an input stream to at least one signal processing path; generating signaling information in a signaling region of the frame; And transmitting the frame in which the signaling information is inserted, wherein the signaling information includes ISSY (Input Stream Synchronizer) mode information, receiver buffer size information requested according to the ISSY mode information, And a time at which a predetermined bit of the first user packet among the user packets is output.

Here, the predetermined frame may be the first frame to which the interleaving frame for transmitting the user packet is mapped.

Wherein the signaling region includes a configurable field and a dynamic field, the configurable field includes the ISSY mode information, and the dynamic field includes a size of the receiver buffer size And the time information between a P1 symbol of a predetermined frame transmitting the user packet and a time at which a predetermined bit of the first user packet of the user packet is outputted.

In addition, the dynamic field may further include ISCR (Input Stream Clock Reference) information.

Also, the signaling information may include pre-signaling information and post signaling information, and the configurable field and the dynamic field may be included in the post-signaling information.

According to another aspect of the present invention, there is provided a signal processing method of a receiving apparatus, the method including receiving a frame including signaling information and data mapped to at least one signal processing path, extracting the signaling information from the received frame, And signal processing the data included in the frame based on the extracted signaling information, wherein the signal processing step comprises ISSY (Input Stream Synchronizer) mode information included in the signaling information, Based on the receiver buffer size information required according to the ISSY mode information and the time information between the P1 symbol of the predetermined frame for transmitting the user packet and the time at which the predetermined bit of the first user packet in the user packet is output, Signal processing can be performed.

As described above, according to various embodiments of the present invention, information for ensuring a variable delay caused by data processing in a transmission apparatus can be obtained from the signaling information, thereby improving the stream processing performance of the receiver.

1 is a block diagram showing the configuration of a transmitting apparatus according to an embodiment of the present invention;
2 is a block diagram for explaining a configuration of a transmission side DVB-T2 system;
3 is a block diagram illustrating a configuration for generating signaling information according to an embodiment of the present invention;
4A to 4D are views for explaining a unit structure of a transmission frame according to an embodiment of the present invention.
5A and 5B illustrate an ISSY mode according to various embodiments of the present invention.
6A to 6F are diagrams for explaining a configuration of a signaling field according to various embodiments of the present invention.
7 is a block diagram illustrating a configuration of a receiving apparatus according to an embodiment of the present invention.
8 is a block diagram for explaining a signal processing unit according to an embodiment of the present invention.
9 is a block diagram showing the configuration of a signaling processing unit according to an embodiment of the present invention.
10 is a flowchart illustrating a signal processing method of a receiving apparatus according to an embodiment of the present invention.
11 is a flowchart illustrating a signal processing method of a receiving apparatus according to an embodiment of the present invention.
12A to 12F are diagrams for explaining the configuration of a system configuration and a signaling field according to an embodiment of the present invention.

Various embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification.

1 is a block diagram illustrating a configuration of a transmitting apparatus according to an embodiment of the present invention. Referring to FIG. 1, a transmitting apparatus 100 includes a frame generating unit 110, an information inserting unit 120, and a transmitting unit 130.

The frame generation unit 110 generates a frame by mapping the data included in the input stream to at least one signal processing path. In one embodiment, the DVB-T2 system applies the PLP concept to enable various broadcasting services to be provided having different modulation schemes, channel coding rates, time, and cell interleaving lengths in one broadcast channel.

Here, PLP refers to a signal path that is processed independently. In other words, each service (e.g., video, extended video, audio, data stream, etc.) can be transmitted and received through a plurality of RF channels, and the PLP can transmit data ≪ / RTI > In addition, the PLP may be located in slots that are distributed with a time interval on a plurality of RF channels, or may be distributed with a time interval on one RF channel. That is, one PLP can be distributed over one RF channel or multiple RF channels with a time interval.

The PLP structure is composed of an input mode A that provides one PLP and an input mode B that provides a plurality of PLPs. In particular, when the input mode B is supported, not only a robust specific service can be provided, Time diversity gain can be obtained by increasing the time interleaving length. In addition, when only a specific stream is received, the power of the receiver can be turned off during the remaining time, so that it can be used with low power, which is suitable for providing portable and mobile broadcast service.

In order to reduce the deterioration of transmission quality in the mobile communication transmission path, time diversity is performed so that when the same signal is transmitted several times at a predetermined time interval at the transmitting side, the receiving side synthesizes the received signals again to obtain a good transmission quality Technology.

In addition, it is possible to increase the transmission efficiency by including information that can be commonly transmitted to a plurality of PLPs in one PLP. Such PLPs are referred to as common PLPs, and other PLPs other than PLP0 transmit data And this PLP is referred to as a data PLP.

That is, the frame generation unit 110 generates the frames by mapping the data included in the input stream to at least one signal processing path, and performs signal processing for each path. For example, the signal processing includes input stream synchronization, delay compensation, null packet deletion, CRC encoding, header insertion, coding, , Interleaving, and / or modulation. The frames processed by each path are generated as one transmission frame together with the signaling information, and the generated transmission frame is transmitted to a receiving device (not shown).

The information inserting unit 120 inserts the signaling information into the signaling area of the frame.

Here, the signaling information may be an L1 (Layer 1) signaling signal for transmitting an L1 signal for frame synchronization, and may include a configurable field and a dynamic field, And may be a P2 symbol for frame synchronization. A signaling region may be added at the beginning of the frame to generate a transmission signal. In one embodiment, a unit of a transmission frame to which a P1 symbol and a signaling region are added to a frame in a DVB-T2 system is referred to as a T2 frame.

The P2 symbol may divide the pre-signaling information region and the post signaling information region. In addition, the post-signaling region may comprise a configurable field and a dynamic field.

The P1 and P2 symbols are terms in the DVB-T2 example, the P1 symbol is a symbol indicating the start of a frame, and the P2 symbol can be understood as a symbol including a signaling area. As another embodiment, one preamble symbol including a signaling region may be used to inform the start of a frame.

Meanwhile, the signaling information inserted into the signaling region according to an embodiment of the present invention includes ISSY (Input Stream Synchronization) mode information, receiver buffer size information (hereinafter referred to as BUFS (Buffer Size)) required according to ISSY mode information, Time information (hereinafter, referred to as " TTO ") between a P1 symbol of a predetermined frame for transmitting a user packet (another symbol indicating the start of a frame such as a preamble) and a time at which a predetermined bit of the first user packet is output, Output). Here, the predetermined frame is the first frame to which the interleaving frame for transmitting the user packet is mapped, and the predetermined bit may be the MSB (Most Significant Bit). The P1 and P2 symbols are terms in the DVB-T2 example The P1 symbol is a symbol indicating the start of a frame and the P2 symbol can be understood as a symbol including a signaling region. As another embodiment, one preamble symbol including a signaling region may be used to inform the start of a frame. Here, the precise definition of the TTO depends on the configuration of the start symbol of the frame and the definition of the user packet, and will be described in the following embodiments.

 The ISSY is intended to ensure a variable delay caused by data processing at the transmitting device so that when the ISSY is used, the receiver can regenerate the correct timing for recovering the output stream. Variables for ISSY are BUFS, TTO, and ISCR described above. Here, ISCR means sink timing information generated considering the channel and all the delays generated in the transmission process so that the service can be restored at the original timing at the time of service restoration in the receiver.

The ISCR information may be included in at least one of the L1 packet and the L2 packet. Depending on the ISSY mode, the signaling information may further include ISCR (Input Stream Clock Reference) interval information. Here, the ISCR (Input Stream Clock Reference) interval information is information necessary for the ISSY mode in which the ISCR value is transmitted in a part of the L1 packet, and indicates the interval of the L1 packets in which the ISSY field exists.

Meanwhile, the ISSY mode information may be included in the configurable field of the L1 signaling, and the BUFS and TTO may be included in the dynamic field of the L1 signaling.

In addition, the dynamic field may further include ISCR (Input Stream Clock Reference) interval information.

On the other hand, for the above-mentioned Input Stream Synchronizer (ISSY), BUFS (BUF), TO (Time To Output) and ISCR (Input Stream Clock Reference), Digital Video Broadcasting (DVB) generation digital terrestrial television broadcasting system (DVB-T2) ".

The transmission unit 130 transmits a frame in which signaling information is inserted. The transmitting apparatus 100 may transmit the service data to the receiving apparatus (not shown) together with the signaling information including the position and size information of the data.

2 is a block diagram illustrating a configuration of a DVB-T2 on which the present invention is based.

2, the DVB-T2 transmission system 1000 may include an input processor 1100, a BICM encoder 1200, a frame builder 1300, and a modulator 1400.

The configuration of the DVB-T2 transmission system 1000 is the same as that defined in DVB-T2, which is one of the European digital broadcasting standards. For details, refer to "Digital Video Broadcasting (DVB) Frame Structure Channel Coding and Modulation for a Second Generation Digital Terrestrial Television Broadcasting System (DVB-T2) ".

The input processor 1100 generates a BBFRAME (Baseband Frame) from the input stream for the data to be served. Here, the input stream may be an MPEG-2 TS (Transport Stream), a GS (Generic Stream), or the like.

The input processor 1100 may include the Input Stream Synchronizer (ISSY) module described above, and the ISSY variables described above may be generated by the ISSY module. As a concrete example of the ISCR among the ISSY variables, the first bit (or byte) of a specific user packet may be a counter value at the moment of input to the input processor 1100. The counter is a counter operating at a period known to the transmitter and receiver.

The BICM encoder 1200 determines an FEC coding rate and a constellation order according to a region (Fixed PHY Frame or Mobile PHY Frame) to which data to be transmitted is to be transmitted, and performs coding. The signaling information for the data to be served may be encoded through a separate BICM encoder (not shown) or may be encoded by sharing the BICM encoder 1200 with the data to be served.

The frame builder 1300 and the modulator 1400 determine an OFDM parameter for a signaling region and an OFDM parameter for an area to which data to be transmitted is to be transmitted to construct a frame and add a sink area to generate a frame. Then, modulation is performed to modulate the generated frame with the RF signal, and the RF signal is transmitted to the receiver.

1 may be performed in the input processor 1100, and information insertion may be performed in the frame builder 1300. [

3 is a block diagram illustrating a configuration for generating signaling information according to an embodiment of the present invention.

Referring to FIG. 3, an input processor 1100 and a BICM encoder 1200 are shown. The input processor 1100 may include a scheduler 1110. The BICM encoder 1200 includes an L1 signaling generator 1210, FEC encoders 1220-1 and 1220-2, a bit interleaver 1230-2, a demux 1240-2, constellation mapers 1250-1 and 1250 -2). ≪ / RTI > The BICM encoder 1200 may further include a time interleaver (not shown). The L1 signaling generator 1210 may also be included in the input processor 1100.

n service data are mapped to PLP0 to PLPn, respectively. The scheduler 1110 determines the position, modulation, and code rates for each PLP in order to map a plurality of PLPs to the physical layer of T2. That is, the scheduler 1110 generates the L1 signaling information. In some cases, the scheduler 1110 may output the dynamic field information among the L1 post signaling information of the current frame to the frame builder 1300. In addition, the scheduler 1110 may send the L1 signaling information to the BICM encoder 1200. The L1 signaling information includes L1 pre-signaling information and L1 post-signaling information.

The L1 signaling generator 1210 outputs L1 pre-signaling information and L1 post signaling information separately. FEC encoders 1220-1 and 1220-2 perform FEC encoding including shortening and puncturing for L1 pre-signaling information and L1 post-signaling information, respectively. The bit interleaver 1230-2 performs bit interleaving on the encoded L1 post signaling information. The demux 1240-2 controls the order of the bits constituting the cell to control the robustness of the bits and outputs the cells including the bits. The two constellation mappers 1250-1 and 1250-2 map the cells of the L1 pre-signaling information and the L1 post-signaling information to the constellation, respectively. The L1 pre-signaling information and the L1 post signaling information processed through the above-described process are output to the frame builder 1230. Thus, the L1 pre-signaling information and the L1 post-signaling information can be inserted into the frame.

4A to 4D are views for explaining a unit structure of a transmission frame according to an embodiment of the present invention.

The input processing module in which the input stream is processed as an L1 packet, as shown in FIG. 4A, may operate at the data pipe level.

4A shows a process in which an input stream is processed as an L1 packet, and a plurality of input streams 411 to 413 are processed by data pipes 421 to 423 for a plurality of L2 packets through an input pre-processing process , Data pipes 421 to 423 for a plurality of L2 packets are encapsulated into data pipes 431 to 433 for a plurality of L1 packets through an input processing process, and are scheduled in a transmission frame (FIG. 3, 1110). Here, the L2 packet may be of two types: a fixed stream such as a TS (Transport Stream) stream and a variable stream such as a GSE (General Stream Encapsulation) stream.

4B is a diagram for explaining a local frame structure for each PLP.

As shown in FIG. 4B, the L1 packet 430 includes a header, a data field, and a padding field.

The L1 packet 430 is processed by the L1 FEC packet 440 by adding the parity 432 through the FEC encoding process.

The L1 FEC packet 440 is processed by a FEC block 450 through a bit interleaving and a constellation mapping process, a plurality of FEC blocks are processed through a cell interleaving process into a time interleaving block 460, and a plurality of time interleaving blocks Thereby constructing an interleaving frame 470.

4C is a diagram for explaining a structure of an interleaving frame.

Referring to FIG. 4C, an interleaving frame 410 may be transmitted through different transmission frames 421 and 422, and a plurality of transmission frames may form a single super frame 430.

Meanwhile, one transmission frame 421 may be composed of a P1 symbol 10 indicating a start position of a frame, a P2 symbol 20 transmitting an L1 signal, and data symbols 30 transmitting data.

The P1 symbol 10 is located at the beginning of the transmission frame 421 and can be used to detect the starting point of the T2 frame 500. [ For example, the P1 symbol 10 may transmit 7 bits of information.

The P2 symbol 20 is located after the P1 symbol 10 of the T2 frame 500. In one transmission frame 421, a plurality of P2 symbols 20 may be included according to the FFT size. The number of P2 symbols 20 included according to the FFT size is as follows.

FFT size P2 symbol number 1K 16 2K 8 4K 4 8K 2 16K One 32K One

The P2 symbol 20 includes L1 pre-signaling information 21 and L1 post-signaling information 23. The L1 pre-signaling information 21 provides the basic transmission parameters including the parameters required to receive and decode the L1 post signaling.

The L1 post-signaling information 23 includes a configurable field 23-1 and a dynamic field 23-2. In addition, the L1 post signaling information 23 may optionally include an extension field 23-3. Also, although not shown in the figure, the L1 post signaling information 23 may further include a CRC field and, if necessary, an L1 padding field.

4D is a diagram showing the header structure of the L1 packet.

As shown in FIG. 4D, the header 431 of the L1 packet includes an ISSYI field 431-1, a PADI field 431-2, a SYNCD field 431-3, and an ISSY field 431-4.

The ISSYI field 431-1 is a 1-bit field indicating the presence or absence of the ISSY field. When the ISSYI field 431-1 is set to 0 as shown in Table 2, it indicates that the ISSY field is not present. Indicates that the ISSY field is present.

0 No ISSY field One There is ISSY field to signal ISCR information

The PADI field 431-2 is a 2-bit field and indicates the state of the padding sub-area as shown in Table 3. [

00 No Padding 01 1 byte Padding (No PADL field) 10 Padding equal or more than 2 bytes (2 bytes PADL field) 11 Reserved

The SYNCD field 431-3 is a 13-bit field indicating the byte distance from the beginning of the data sub-area to the beginning of the first L1 packet.

The ISSY field 431-4 is a 24-bit field indicating the ISCR value for the first L1 packet. The ISSY field 431-4 may have a value only when the ISSYI field 431-1 is set to " 1 ".

5A and 5B illustrate an ISSY mode according to various embodiments of the present invention.

The ISSY mode according to the embodiment of the present invention, that is, PLP_ISSY_mode represents an input symbol synchronization mode for the PLP. The ISSY mode information may be included in the configurable field of the L1 post signaling field.

As an example, the PLP_ISSY_mode may be composed of 2 bits as shown in FIG. 5A, and may have a value as shown in Table 4 below.

00 ISSY is not used. 01 Reserved 10 The ISCR value is carried as part of the particular L1 packet 11 The ISCR value is appended to each L2 packet

As another example, PLP_ISSYI may be composed of 1 bit as shown in FIG. 5B, and may have a value as shown in Table 5 below.

0 No ISSY field One There is ISSY field to signal ISCR information

However, the present invention is not limited thereto, If the PLP_ISSYI field is set to 1 when the PLP_ISSYI field is set to 1, the TTO and BUFS values are provided to the dynamic field, the ISCR value is provided in the ISSY field of the L2 packet (see FIG. 4D), and the PLP_ISSYI field is set to 0 The ISSY is not used. For example, if the PLP does not transmit any stream or transmits a stream that can correct delay and jitter at a higher layer than the physical layer, the corresponding field may be set to O. [ This will be described later with reference to the drawings.

5C is a diagram for explaining TTO, BUFS, and ISCR_Interval information according to an embodiment of the present invention.

For example, the TTO may be composed of 32 bits, the BUFS may be composed of 12 bits, and the ISCR_Interval may be composed of 10 bits. Here, ISCR_Interval has a value of PLP_ISSY_mode of "10". When the value of the corresponding field is set to 0, the presence or absence of the ISSY field is determined by the ISSYI of the header area. If the value of the corresponding field is not 0 Value indicates the interval of L1 packets in which the ISSY field is present in the header area and starts from the first L1 packet of the interleaving frame. For example, if the value of the corresponding field is set to 0, there is an ISSY field in the first L1 packet, the 11th L1 packet, the 21st L1 packet, etc. of the interleaving frame.

The ISSYI field (see FIG. 4D) present in the header field is a 1-bit field indicating the presence or absence of the ISSY field. When set to 0, it indicates that the ISSY field does not exist. Indicates that the ISSY field is present.

Here, the description of TTO, BUFS, and ISCR_Interval has been described above, so that further description is omitted.

6A to 6F are diagrams for explaining a configuration of a signaling field according to various embodiments of the present invention.

6A, the configurable field of the signaling field according to an embodiment of the present invention includes a PLP_ISSYI field (1 bit), a dynamic field includes a TTO field (32 bits) and a BUFS field (12 bits) .

Here, the PLP_ISSYI field (1 bit) indicates whether a value for the ISSY mechanism exists or not, and may have a value as shown in Table 6 below in detail.

One TTO and BUFS values shall be provided in the PLP loop of the dynamic L1-post signaling and the ISCR value shall be provided in the ISSY field of a L2 packet carrying TS packets 0 ISSY use is not activated

That is, if the PLP_ISSYI field is set to 1, the TTO and BUFS values are provided in the dynamic field and the ISCR value is provided in the ISSY field of the L2 packet (see FIG. 4D). Also, when the PLP_ISSYI field is set to 0, it indicates that the ISSY is not activated. If the PLP does not transmit any stream, the corresponding field may be set to O. [

The TTO field (32 bits) represents the TTO value for the first L2 packet starting in the data subarea of the first L1 packet of the interleaving frame including the transmission frame. If the PLP_ISSYI field is set to '0', the corresponding field may be set to '0'.

The BUFS field (12 bits) indicates the receiver buffer difference assumed by the modulator for the PLP, and may be set to zero if the ISSY is not used, i. E. The PLP_ISSYI field is set to zero.

As shown in FIG. 6B, the signaling field according to another embodiment of the present invention may include a PLP_ISSYI field (1 bit), a TTO field (32 bits), and a BUFS field (12 bits). That is, as an example in which there is no distinction between the configurable field and the dynamic field, the TO field and the BUFS field are meaningless unless PLP_ISSYI is activated. Therefore, based on this dependency, only when the PLP_ISSYI field is 1, Can be included and transmitted.

6C, the configurable field of the signaling field according to another embodiment of the present invention includes a PLP_ISSYI_mode field (2 bits), a dynamic field includes a TTO field (32 bits), a BUFS field (12 bits) , An ISCR Interval field (10 bits), and an ISCR_IF field (24 bits). Here, the ISCR Interval field has a value when the PLP_ISSYI_mode is 10, that is, when the ISCR value is transmitted as a part of the L1 packet.

Here, the PLP_ISSYI_mode field (2 bits) can have the values shown in Table 7 below.

00 _B ISSY is not used. 01 _B The ISCR value is carried as part of each L1 packet (header) 10 _B The ISCR value is carried as part of the particular L1 packet (header) 11 _B The ISCR value is appended to each user packet (or reserved)

On the other hand, the dynamic field as shown in FIG. 6C has the same value for all transmission frames to which the interleaving frame is mapped, and the TTO field and the BUFS field always exist and can be used as a reserved area.

Specifically, the TTO directly signals the TTO value for the first user packet beginning in the data field of the first L1 packet of the interleaving frame.

BUFS represents the assumed receiver buffer size for the PLP and ISCR_Interval represents the number of L1 packets between the two L1 packets transmitting the ISCR value. If the value is set to 0, whether to transmit the ISCR value can be indicated in the header of the L1 packet. 0 < ISCR_Interval < 1023D, the first L1 packet of the interleaving frame carries the ISCR value. The field is displayed in the case where PLP_ISSY_mode 10 _B.

ISCR_IF transmits the ISCR value for the first user packet beginning in the data field of the first L1 packet in the interleaving frame. This field appears only if the ISCR_Interval is 1023 _D. Also, if the field is ISCR_Interval > 0, the first L1 packet of the interleaving frame may be omitted if it transmits an ISCR value.

6D, the configurable field of the signaling field according to another embodiment of the present invention includes a PLP_ISSYI_mode field (1 bit), a dynamic field includes a TTO field (32 bits), a BUFS field (12 bits) , And an ISCR Interval field (10 bits). Here, the TTO field, the BUFS field, and the ISCR Interval field can have values when PLP_ISSYI is activated, that is, when PLP_ISSYI_mode is 1.

Here, the PLP_ISSYI_mode field (1 bit) may have the values shown in Table 8 below.

0B ISSY is not used. 1B The ISCR value is carried as part of the L1 packet (header)

Meanwhile, the dynamic field as shown in FIG. 6D has the same value for all transmission frames to which the interleaving frame is mapped.

6E, the configurable field of the signaling field according to another embodiment of the present invention includes a PLP_ISSYI_mode field (1 bit), a dynamic field includes a TTO field (32 bits), a BUFS field (12 bits) , And an ISCR Interval field (10 bits).

Here, when the PLP_ISSYI_mode is 0, the values of the TTO field, the BUFS field, and the ISCR Interval field may be set to "0" or used as reserved areas.

Also, if PLP_ISSYI_mode is 1, the first L1 packet of the interleaving frame can transmit the ISCR value.

Here, the PLP_ISSYI_mode field (1 bit) may have a value as shown in the following table.

0B ISSY is not used. 1B The ISCR value is carried as part of the L1 packet (header)

ISCR_Interval represents the interval of the L1 packet transmitting the ISCR value, and the first L1 packet of the interleaving frame transmits the ISCR value. If the value is set to O, a value indicating whether to transmit the ISCR value is included in the header of the L1 packet. Also, if the value is set to '1023 _B ', only the first L1 packet of the interleaving frame transmits the ISCR value.

6F, the configurable field of the signaling field according to another embodiment of the present invention includes a PLP_ISSYI_mode field (2 bits), a dynamic field includes a TTO field (32 bits), a BUFS field (12 bits) , And an ISCR Interval field (10 bits).

Here, the PLP_ISSYI_mode field (2 bits) may have a value as shown in the following table.

00 _B ISSY is not used. 01 _B reserved 10 _B The ISCR value is carried as part of the L1 packet (header) 11 _B The ISCR value is appended to each user packet

In this case, if PLP_ISSYI_mode is a 00 _B or 01 _B, the value of TTO and BUFS fields, or set to "0", it can be used as a reserved area.

In addition, when a non-PLP_ISSYI_mode 10 _B, the value of Interval field ISCR is either set to zero, can be used as a reserved area.

If ISCR_Interval is set to 0, whether to transmit the ISCR value can be indicated in the header of the L1 packet. Otherwise, the first L1 packet of the interleaving frame may transmit the ISCR value.

7 is a block diagram illustrating a configuration of a receiving apparatus according to an embodiment of the present invention.

7, a receiving apparatus 200 includes a receiving unit 210, a signaling processing unit 220, and a signal processing unit 230. [

The receiving unit 210 receives a frame including signaling information and data mapped to at least one signal processing path. Herein, the signaling information includes information on receiver buffer size (hereinafter referred to as BUFS) required according to ISSY (Input Stream Synchronizer) mode information, ISSY mode information, P1 symbol of a predetermined frame for transmitting a user packet, (Hereinafter referred to as &quot; TTO &quot;).

The signaling processing unit 220 extracts signaling information from the received frame. In particular, the signaling processor 220 may extract and decode the L1 signaling to obtain the ISSY mode, BUFS, and TTO values. For this, the signaling processing unit 220 can detect and decode P1 symbols including L1 signaling.

In addition, the signaling processing unit 220 may extract and decode the L1 signaling as needed to obtain the ISCR value. However, in some cases, the ISCR value may be obtained through the signal processing unit 230 according to the included position.

The signal processing unit 230 can process the data included in the frame based on the extracted signaling information.

The signal processing unit 230 may process the received frame using the ISSY mode, the BUFS value, and the TTO value acquired by the signaling processing unit 220. [ For example, signal processing can perform demodulation, frame de-builder, BICM decoding, and input de-processing.

In particular, the signal processor 230 extracts the PLP and decodes the PLP, and generates the L2 packet from the error-corrected L1 packet based on the ISSY mode, BUFS, TTO value, and ISCR value provided by the signaling processor 220.

 8 is a block diagram for explaining a signal processing unit according to an embodiment of the present invention.

8, the signal processing unit 230 includes a demodulator 231, a decoder 232, and a stream generator 233. [

The demodulator 231 demodulates the received RF signal according to the OFDM parameter to perform sync detection. If the sync is detected, the demodulator 231 recognizes whether a mobile frame is received or a fixed frame is received from the information stored in the sink area.

In this case, if the OFDM parameters for the signaling area and the data area are not predetermined, the OFDM parameters for the signaling area and the data area stored in the sink area are obtained and the signaling area and the data area OFDM parameter information and perform demodulation.

The decoder 232 decodes the input data. In this case, the decoder 232 can obtain parameters such as the FEC scheme and the modulation scheme for the data stored in the respective data areas using the signaling information, and perform decoding. In addition, the decoder 223 can calculate the start position of the data based on the data information included in the configurable field and the dynamic field. That is, it is possible to calculate at which position of the frame the corresponding PLP is transmitted.

The stream generator 233 can process the BB frame (BB FRAME) input from the decoder 232 to generate data to be served.

The stream generator 233 can generate an L2 packet from the error-corrected L1 packet based on the ISSY mode, the BUFS, the TTO value, and the ISCR value provided by the signaling processing unit 220. [

In particular, the stream generator 233 may include de-jitter buffers that are accurate to recover the output stream based on the ISSY mode, BUFS, TTO value, and ISCR value provided in the signaling processing section 220 The timing can be regenerated. Thus, a delay for synchronization between a plurality of PLPs can be compensated.

9 is a block diagram showing the configuration of a signaling processing unit according to an embodiment of the present invention.

9, the signaling processing unit 220 includes a demodulator 221, a multiplexer 222, a deinterleaver 223, and a decoder 224. [

The demodulator 221 receives and demodulates the signal transmitted from the transmitting apparatus 100. Specifically, the demodulator 221 demodulates the received signal to generate a value corresponding to the LDPC codeword, and outputs the value to the multiplexer 222.

In this case, the value corresponding to the LDPC codeword can be represented by the channel value for the received signal. Here, the channel value may be determined in various ways, for example, a method of determining a log likelihood ratio (LLR) value.

Here, the LLR value can be represented by a value obtained by taking a log as a ratio of the probability that the bits transmitted from the transmitting apparatus 100 are 0 and the probability of one day. Alternatively, the LLR value may be a bit value determined according to a hard decision, and the LLR value may be a representative value determined according to a period in which the probability that the bit transmitted from the transmitting apparatus 100 is 0 or 1 .

The multiplexer 222 multiplexes the output value of the demodulator 221 and outputs it to the deinterleaver 223. Here, the output value of the demodulator 221 corresponds to the LDPC codeword, and may be an LLR value, for example.

Specifically, the MUX 222 is a component corresponding to the DEMUX (FIG. 3, 1240-2) provided in the transmission apparatus 100, and performs the demultiplexing operation performed in the DEMUX 1240-2 inversely can do. That is, the multiplexer 222 performs a parallel-to-serial conversion on the value corresponding to the LDPC codeword output from the demodulator 221 to multiplex the value corresponding to the LDPC codeword.

The deinterleaver 223 deinterleaves the output value of the MUX 222 and outputs it to the decoder 224. [

Specifically, the deinterleaver 223 is a component corresponding to the interleaver (FIG. 3, 1230-2) provided in the transmitting apparatus 100, and performs inverse operations performed in the interleaver (FIG. 3, 1230-2) can do. That is, the deinterleaver 223 can deinterleave the values corresponding to the LDPC codeword so as to correspond to the interleaving operation performed in the interleaver (FIGS. 3 and 1230-2). Here, the value corresponding to the LDPC codeword can be an LLR value as an example.

The decoder 224 is a component corresponding to the FEC encoder 1220-2 included in the transmission apparatus 100 and can perform an operation performed by the FEC encoder 1220-2 inversely. Specifically, the decoder 224 may perform decoding based on the deinterleaved LLR value to output L1 signaling.

10 is a flowchart illustrating a signal processing method of a receiving apparatus according to an embodiment of the present invention.

According to the signal processing method of the transmitting apparatus shown in FIG. 10, first, a frame is generated by mapping data included in an input stream to at least one signal processing path (S1010).

Then, the signaling information is inserted into the signaling area of the frame (S1020). Herein, the signaling information includes information on an ISSY (Input Stream Synchronizer) mode, receiver buffer size information requested according to ISSY mode information, P1 symbol of a predetermined frame for transmitting a user packet, and predetermined bits May be included in the time information. Here, the predetermined frame may be the first frame to which the interleaving frame for transmitting the user packet is mapped.

Thereafter, the frame in which the signaling information is inserted is transmitted (S1O30).

In addition, the signaling region of the frame into which the signaling information is inserted may include a configurable field and a dynamic field. In this case, the ISSY mode information is included in the configurable field, and the time information between the receiver buffer size and the P1 symbol of the predetermined frame transmitting the user packet and the time when the predetermined bit of the first user packet among the user packets is output is May be included in the dynamic field.

In addition, the dynamic field may further include ISCR (Input Stream Clock Reference) information.

Also, the signaling information may include pre-signaling information and post signaling information, and the configurable field and the dynamic field may be included in the post-signaling information.

11 is a flowchart illustrating a signal processing method of a receiving apparatus according to an embodiment of the present invention.

According to the signal processing method of the receiving apparatus shown in Fig. 11, a frame including signaling information and data mapped to at least one signal processing path is received (S1110).

Subsequently, signaling information is extracted from the received frame (S1120).

Thereafter, based on the extracted signaling information, the data included in the frame is subjected to signal processing (S1130). In this case, the ISSY (Input Stream Synchronizer) mode information included in the signaling information, the receiver buffer size information requested according to the ISSY mode information, and the P1 symbol of the predetermined frame for transmitting the user packet and the first user packet The data can be signal-processed based on the time information between the time when the set bit is outputted.

In addition, the signaling region of the frame into which the signaling information is inserted may include a configurable field and a dynamic field. In this case, the ISSY mode information is included in the configurable field, and the time information between the receiver buffer size and the P1 symbol of the predetermined frame transmitting the user packet and the time when the predetermined bit of the first user packet among the user packets is output is May be included in the dynamic field.

In addition, the dynamic field may further include ISCR (Input Stream Clock Reference) information.

Also, the signaling information may include pre-signaling information and post signaling information, and the configurable field and the dynamic field may be included in the post-signaling information.

12A to 12F are diagrams illustrating a case where an ISSY field exists in an L2 packet according to another embodiment of the present invention.

12A is a diagram showing another embodiment of the input processor 1100. In Fig. 12A, the input processor 1100 includes a Baseband Packet (BBP) generator S1210 and a Baseband Packet (BBF) generator S1220. The BBP corresponds to the L2 packet in the above-described embodiment and the BBF corresponds to the L1 packet in the above-described embodiment. The BBP generator S1210 generates a BBP by inputting TS, IP, or other types of streams. At this time, the TS stream can be output in its original form without being converted into the BBP format, and it is noted that the TS packet constituting the TS stream corresponds to the L2 packet in the above-described embodiment. The BBF generator S1220 receives the BBPs and generates a BBF.

12B is a diagram showing a relationship between the BBP (S1230) and the BBF (S1240). In FIG. 12B, the BBP Payload of the BBP (S1230) is a packet that constitutes a TS, an IP, or another type of stream. It is noted that the BBF (S1240) may also include a plurality of complete BBPs or portions thereof.

12C is a diagram showing an example of the format of the BBP (S1230) when the input stream of the PLP is a TS stream.

12D shows an example of a format of a BBP (S1230) composed of TS packets constituting the TS stream when the input stream of the corresponding PLP includes a TS stream and includes an IP or other kinds of streams in addition to the TS stream FIG.

12C and 12D, an ISSY field is included in the Extension / Variable header of the BBP. The ISSY field includes a counter value at the moment when the first TS packet included in the BBP (S1230) is input to the BBP generator S1210 Lt; / RTI &gt; may be transmitted. The counter is a counter operating at a period known to the transmitter and receiver. The ISSY field may be included only in the first BBP (S1230) starting from the BBF (S1240) among the one or more BBPs (S1230) constituting the BBF (S1240).

FIG. 12E is a diagram for explaining a configuration of a signaling field according to the embodiment shown in FIGS. 12A to 12D. In the configurable L1-post of FIG. 12E, PLP_ISSY_IND is a field for signaling whether an ISSY is applied to the corresponding PLP. The PLP_BUFS indicates a maximum buffer size requested for the corresponding PLP in the dynamic L1-post shown in FIG. 12E. The PLP_TTO indicates a size of the interleaving frame from the preamble of the first frame constituting the interleaving frame including the frame in which the signaling fields are transmitted, Is the time information between the time when the first TS packet of the first full BBP included in the first BBF of the first BBF is output. The PLP_TTO is calculated as a multiple of the period of the counter set to determine the ISCR.

In the above embodiment, only when the PLP_ISSY_IND of the corresponding PLP is set to '1', there are PLP_TTO and PLP_BUFS fields in the ISSY field and the dynamic L1-post of the BBP (S1230). However, It is obvious that it can be treated as reserved.

12F is another diagram for explaining the configuration of a signaling field according to the embodiment shown in FIGS. 12A to 12D. 12F is the same as FIG. 12E except that the maximum buffer size requested for the corresponding PLP is signaled by two fields of PLP_BUFS_UNIT and PLP_BUFS. The PLP_BUFS_UNIT field is a field for signaling the unit of the PLP_BUFS, and is defined as shown in Table 11 below. Therefore, in the embodiment shown in FIG. 12F, the maximum buffer size requested for the corresponding PLP is calculated by multiplying the number indicated in the PLP_BUFS field by the unit signaled as PLP_BUFS_UNIT.

00 1Kbits 01 8Kbits 10 64Kbits 11 1Mbits

As described above, according to various embodiments of the present invention, information for ensuring a variable delay caused by data processing in a transmission apparatus can be obtained from the signaling information, thereby improving the stream processing performance of the receiver.

Meanwhile, a non-transitory computer readable medium may be provided in which a program for sequentially performing the signal processing method according to the present invention is stored.

A non-transitory readable medium is a medium that stores data for a short period of time, such as a register, cache, memory, etc., but semi-permanently stores data and is readable by the apparatus. In particular, the various applications or programs described above may be stored on non-volatile readable media such as CD, DVD, hard disk, Blu-ray disk, USB, memory card, ROM,

Although the buses are not shown in the above-described block diagrams for the transmitting apparatus and the receiving apparatus, the communication between the respective elements in the transmitting apparatus and the receiving apparatus may be performed via the bus. Further, each apparatus may further include a processor such as a CPU, a microprocessor, or the like that performs the various steps described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention.

100: transmitting apparatus 110: frame generating unit
120: information insertion unit 130:
200: Receiver
210: Receiver 220: Signaling processor
230: Signal processor

Claims (20)

In the transmitting apparatus,
A frame generation unit for generating a frame by mapping data included in an input stream to at least one signal processing path;
An information inserter for inserting signaling information in a signaling area of the frame; And
And a transmitter for transmitting the frame in which the signaling information is inserted,
Wherein the signaling information comprises:
(ISSY) mode information, a receiver buffer size information requested according to the ISSY mode information, a P1 symbol of a predetermined frame for transmitting a user packet, and a time when a predetermined bit of a first user packet among the user packets is outputted And time information between the time information and the time information. The method according to claim 1,
Wherein the predetermined frame is a first frame to which an interleaving frame for transmitting the user packet is mapped,
Wherein the predetermined bit is an MSB (Most Significant Bit). The method according to claim 1,
Wherein the signaling region comprises:
Comprising a configurable field and a dynamic field,
Wherein the configurable field includes the ISSY mode information,
Wherein the dynamic field includes the time information between the receiver buffer size and a P1 symbol of a predetermined frame transmitting the user packet and a time at which a predetermined bit of a first user packet of the user packet is output Transmitting apparatus. The method of claim 3,
Wherein the dynamic field comprises:
And an input stream clock reference (ISCR) information. The method of claim 3,
Wherein the signaling information comprises:
Pre-signaling information and post-signaling information,
Wherein the configurable field and the dynamic field are included in the post signaling information. The method according to claim 1,
The transmitting apparatus is implemented as a DVB-T2 transmitting system,
Wherein the signaling region of the frame is an area for transmitting L1 signaling. The method according to claim 1,
The transmitting apparatus is implemented as a DVB-T2 transmitting system,
Wherein the receiver buffer size is BUFS (Buffer Size), and the time information is TTO (Time To Output). A receiving unit for receiving a frame including signaling information and data mapped to at least one signal processing path;
A signaling processor for extracting the signaling information from the received frame; And
And a signal processing unit for signal processing the data included in the frame based on the extracted signaling information,
The signal processing unit,
An ISSY (Input Stream Synchronizer) mode information included in the signaling information, a receiver buffer size information requested according to the ISSY mode information, a P1 symbol of a predetermined frame for transmitting a user packet, and a P1 symbol of a first user packet Wherein the signal processing section performs signal processing on the data based on time information between a time when a set bit is output. 9. The method of claim 8,
Wherein the predetermined frame is a first frame to which an interleaving frame for transmitting the user packet is mapped, and the predetermined bit is an MSB (Most Significant Bit). 9. The method of claim 8,
Wherein the signaling region comprises:
Comprising a configurable field and a dynamic field,
Wherein the configurable field includes the ISSY mode information,
Wherein the dynamic field includes the time information between the receiver buffer size and a P1 symbol of a predetermined frame transmitting the user packet and a time at which a predetermined bit of a first user packet of the user packet is output Receiving device. 11. The method of claim 10,
Wherein the dynamic field comprises:
Further comprising: ISCR (Input Stream Clock Reference) information. 11. The method of claim 10,
Wherein the signaling information comprises:
Pre-signaling information and post-signaling information,
Wherein the configurable field and the dynamic field are included in the post signaling information. 10. The method of claim 9,
The receiving apparatus is implemented as a DVB-T2 receiving system,
Wherein the signaling region of the frame is an area for transmitting L1 signaling. 10. The method of claim 9,
The receiving apparatus is implemented as a DVB-T2 receiving system,
Wherein the receiver buffer size is BUFS (Buffer Size), and the time information is TTO (Time To Output). A signal processing method of a transmitting apparatus,
Generating a frame by mapping data included in an input stream to at least one signal processing path;
Inserting signaling information in a signaling region of the frame; And
And transmitting a frame in which the signaling information is inserted,
Wherein the signaling information comprises:
(ISSY) mode information, a receiver buffer size information requested according to the ISSY mode information, a P1 symbol of a predetermined frame for transmitting a user packet, and a time when a predetermined bit of a first user packet among the user packets is outputted Wherein the time information includes time information between the time information and the time information. 16. The method of claim 15,
Wherein the predetermined frame is a first frame to which an interleaving frame for transmitting the user packet is mapped, and the predetermined bit is an MSB (Most Significant Bit). 16. The method of claim 15,
Wherein the signaling region comprises:
Comprising a configurable field and a dynamic field,
Wherein the configurable field includes the ISSY mode information,
Wherein the dynamic field includes the time information between the receiver buffer size and a P1 symbol of a predetermined frame transmitting the user packet and a time at which a predetermined bit of a first user packet of the user packet is output Signal processing method. 18. The method of claim 17,
Wherein the dynamic field comprises:
Further comprising: ISCR (Input Stream Clock Reference) information. 18. The method of claim 17,
Wherein the signaling information comprises:
Pre-signaling information and post-signaling information,
Wherein the configurable field and the dynamic field are included in the post signaling information. A signal processing method of a receiving apparatus,
Receiving a frame including signaling information and data mapped to at least one signal processing path;
Extracting the signaling information in the received frame; And
And signal processing the data included in the frame based on the extracted signaling information,
Wherein the signal processing step comprises:
An ISSY (Input Stream Synchronizer) mode information included in the signaling information, a receiver buffer size information requested according to the ISSY mode information, a P1 symbol of a predetermined frame for transmitting a user packet, and a P1 symbol of a first user packet Wherein the signal processing section performs signal processing on the data based on time information between a time when a set bit is output.

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