KR20150030142A - Transmitting apparatus and receiving apparatus and controlling method thereof - Google Patents

Abstract

The present invention relates to a transmitting apparatus, to a receiving apparatus, and to a controlling method thereof. The transmitting apparatus includes: a frame generating unit which generates a plurality of frames to insert at least one kind of data; a preamble symbol insertion unit which inserts a preamble symbol to each of the frames; and a transmitting unit which transmits the frame into which the preamble symbol is inserted. Each preamble symbol includes location information of the frame into which the same kind of data is inserted. The present invention can reduce power consumption by processing only a frame including the same kind of data.

Description

TECHNICAL FIELD [0001] The present invention relates to a transmitting apparatus, a receiving apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission apparatus, a reception apparatus and a control method thereof, and more particularly to a transmission apparatus, a reception apparatus and a control method thereof using an OFDM scheme.

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.

On the other hand, a stream including various kinds of data can be transmitted. For example, the transmitting apparatus can transmit a stream including data supporting the fixed terminal or data supporting the mobile terminal, and accordingly, the receiving apparatus needs to process only the data that can be supported according to the type of the receiving apparatus . In addition, there is an increasing need for the transmitting apparatus to transmit information about data that can be supported by the receiving apparatus in a stream.

It is an object of the present invention to provide a transmitting apparatus, a receiving apparatus, and a control method thereof using a preamble symbol including information on a position of a frame.

According to an aspect of the present invention, there is provided a transmission apparatus including a frame generator for generating a plurality of frames into which at least one kind of data is inserted, a preamble for inserting a preamble symbol in each of the plurality of frames, A symbol inserter, and a transmitter for transmitting a plurality of frames in which the preamble symbol is inserted. Each of the preamble symbols includes position information of a frame in which data of the same type is inserted.

Here, the position information includes the number information and the length information of frames existing between the shortest distance frame among a plurality of subsequent frames in which the same type of data is recorded.

The at least one kind of data includes at least one of first data for a fixed terminal and second data for a mobile terminal.

The preamble symbol inserted in each of the plurality of frames includes an indicator field indicating whether data inserted in the frame is for a fixed terminal or for a mobile terminal.

Meanwhile, a receiving apparatus according to an embodiment of the present invention includes a receiving unit for receiving a plurality of frames including a preamble symbol and data, and a receiving unit for receiving a preamble symbol of the same type A signaling processing unit for detecting position information of a frame in which data is inserted, and a signal processing unit for selectively processing a frame in which data of the same type as the data is inserted based on the position information.

Here, the position information includes the number information and the length information of frames existing between the shortest distance frame among a plurality of subsequent frames in which the same type of data is recorded.

The signal processing unit may calculate a time corresponding to the shortest distance based on the number information and the length information of the frame.

In addition, the signal processing unit may operate in a steady state in which a standby state is maintained during the calculated time, and a frame of the shortest distance is processed after the calculated time has elapsed.

Here, the data includes at least one of first data for a fixed terminal and second data for a mobile terminal.

The preamble symbol inserted in each of the plurality of frames includes an indicator field indicating whether the data inserted in the frame is for a fixed terminal or for a mobile terminal.

Meanwhile, a control method of a transmitting apparatus according to an embodiment of the present invention includes generating a plurality of frames into which at least one kind of data is inserted, inserting a preamble symbol in each of the plurality of frames, And transmitting the inserted plurality of frames, wherein each of the preamble symbols includes position information of a frame in which data of the same type is inserted.

Here, the position information includes the number information and the length information of frames existing between the shortest distance frame among a plurality of subsequent frames in which the same type of data is recorded.

The at least one kind of data includes at least one of first data for a fixed terminal and second data for a mobile terminal.

The preamble symbol inserted in each of the plurality of frames includes an indicator field indicating whether the data inserted in the frame is for a fixed terminal or for a mobile terminal.

According to another aspect of the present invention, there is provided a method of controlling a receiving apparatus, the method including receiving a plurality of frames including a preamble symbol and data, Detecting position information of a frame in which data of the same kind is inserted, and selectively processing frames in which data of the same kind as the data is inserted based on the position information.

In addition, the position information may include the number information and the length information of frames existing between the frames of the shortest distance among a plurality of subsequent frames in which the same kind of data is recorded.

Further, the processing may calculate a time corresponding to the shortest distance based on the number information and the length information of the frame.

The processing step may operate in a steady state in which a standby state is maintained during the calculated time and a frame of the shortest distance is processed after the calculated time has elapsed.

In addition, the data may include at least one of first data for a fixed terminal and second data for a mobile terminal.

The preamble symbol inserted in each of the plurality of frames may include an indicator field indicating whether the data inserted in the frame is for a fixed terminal or for a mobile terminal.

As described above, according to the various embodiments of the present invention, power consumption can be reduced by processing only frames including the same kind of data.

1 is a block diagram illustrating a configuration of a transmitting apparatus according to an embodiment of the present invention.
2 is a block diagram illustrating a configuration of a DVB-T2 on which the present invention is based.
3 is a block diagram illustrating a configuration for generating signaling information according to an embodiment of the present invention.
4A to 4C are views for explaining a unit structure of a transmission frame according to an embodiment of the present invention.
5 is a diagram illustrating a structure of a frame according to an embodiment of the present invention.
6 is a view for explaining a method of representing position information according to an embodiment of the present invention.
7 is a diagram illustrating fields included in L1 pre-signaling according to an embodiment of the present invention.
8 is a diagram illustrating a field for indicating the type of data included in the L1 post signaling according to an embodiment of the present invention.
9 is a block diagram illustrating a configuration of a receiving apparatus according to an embodiment of the present invention.
FIG. 10 is a block diagram specifically illustrating a signal processing unit according to an embodiment of the present invention.
11 is a view for explaining the operation of a receiving apparatus according to an embodiment of the present invention.
12 is a view for explaining an operation of a receiving apparatus supporting a mobile terminal according to an embodiment of the present invention.
13 is a flowchart illustrating a method of controlling a transmitting apparatus according to an embodiment of the present invention.
14 is a flowchart illustrating a method of controlling a receiving apparatus 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 generator 110, a preamble symbol inserter 120, and a transmitter 130.

The frame generation unit 110 may generate a plurality of frames into which data to be transmitted is inserted. Specifically, the frame generation unit 110 may generate a plurality of frames into which at least one kind of data is inserted. 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. That is, each service (e.g., video, extended video, audio stream, data stream, etc.) can be transmitted and received through a plurality of RF channels, to be. 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 providing one PLP in one frame and an input mode B providing a plurality of PLPs in one frame. In particular, when the input mode B is supported, a specific service can be provided robustly Alternatively, a time diversity gain can be obtained by increasing the time interleaving length by dispersively transmitting one stream. 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.

Here, the time diversity is used to reduce the deterioration of the transmission quality in the mobile communication path where the channel environment changes with time. In a case where a plurality of PLPs are simultaneously transmitted from a transmitting side, each PLP is transmitted alternately at predetermined time intervals instead of bursting by one PLP, thereby obtaining an average transmission quality of all PLPs.

That is, the frame generation unit 110 generates a frame by mapping at least one kind of data 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 preamble symbol inserter 120 may insert a preamble symbol into each of a plurality of frames. Here, each preamble symbol may include position information of a frame in which data of the same kind is inserted.

More specifically, the preamble symbol may include signaling information related to position information of a frame in which data of the same kind is inserted. Here, the signaling information may be an L1 (Layer 1) signaling signal for transmitting an L1 signal for frame synchronization, and may be divided into pre-signaling and post-signaling. In addition, the post signaling may include configurable post signaling and dynamic post signaling. 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 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, for example, the position information in which the same kind of data is inserted according to an embodiment of the present invention may be included in the pre-signaling or post signaling of the P2 symbol.

The transmitter 130 may transmit a plurality of frames in which a preamble symbol is inserted.

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 Transport Stream (TS), a Generic Stream (GS), or the like.

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 construct a frame by determining an OFDM parameter for a signaling region and an OFDM parameter for an area to which data to be transmitted is to be transmitted, and add a sync 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, the same kind of data insertion may be performed in the frame builder 1300, and the preamble symbol insertion may be performed in the modulator 1400 .

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. In some cases, the scheduler 1110 may output dynamic information to the frame builder 1300 during the L1 post signaling of the current frame. In addition, the scheduler 1110 may send the L1 signaling to the BICM encoder 1200. The L1 signaling includes L1 pre-signaling and L1 post signaling.

The L1 signaling generator 1210 distinguishes between L1 pre-signaling and L1 post-signaling. FEC encoders 1220-1 and 1220-2 perform FEC encoding including shortening and puncturing for L1 pre-signaling and L1 post-signaling, respectively. The bit interleaver 1230-2 performs bit interleaving on the encoded L1 post signaling. 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 and the L1 post-signaling, respectively, to the constellation. The L1 pre-signaling and the L1 post signaling processed through the above-described process are output to the frame builder 1230. Thus, the L1 pre-signaling and the L1 post signaling can be inserted in the frame.

4A to 4C 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 470 may be transmitted through different transmission frames 461 and 462, and a plurality of transmission frames may form a single super frame 480. FIG.

Meanwhile, one transmission frame 461 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 461 and can be used to detect the starting point of the T2 frame. 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.

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

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

5 is a diagram illustrating a structure of a frame according to an embodiment of the present invention.

Referring to FIG. 5, the frames 510, 520, 530, 540, 550, 560 and 570 constitute one super frame 500. Each of the frames includes a preamble symbol and a data area.

5, one superframe 500 includes a plurality of frames 510, 520, 530, 50, 530 including a plurality of frames 510, 520, 530, 50, 550, 560, 570, 550, 560, and 570 may include various kinds of data. For example, the first frame 510 includes PLP0 and PLP1, the second frame 520 includes PLP2, and the third frame 530 includes PLP3, PLP4, and PLP5.

In addition, the seventh frame 570 includes a Future Extension Frame (FEF) frame in the data area, which is a frame reserved for future use. Even if the FEF frame is included, the frames 510, 520, 530, 540, 550, 560).

The mode is displayed in the data area of each frame, and the mode indicates the type of the included data. That is, the same mode number is displayed for frames containing the same data.

Therefore, since PLP0 and PLP1 are included in the data area of the first frame 510 and PLP0 and PLP1 are included in the data area of the fourth frame 540, they contain the same data and have the same mode 5 is indicated by mode 0.

The PLP2 is included in the data area of the second frame 520 and the PLP2 is included in the data area of the fifth frame 550. Therefore, Respectively.

Meanwhile, at least one kind of data inserted in a plurality of frames according to an embodiment of the present invention may include at least one of first data for a fixed terminal and second data for a mobile terminal.

For example, as shown in FIG. 5, the super frame 500 may include a frame including first data for a fixed terminal or a frame including second data for a mobile terminal. That is, PLP0 and PLP1 indicated by mode 0 included in the first frame 510 are first data for the fixed terminal, PLP3, PLP4 and PLP5 indicated by mode 2 included in the third frame 530 are moved And second data for the terminal.

That is, the first frame 510 includes data for supporting a fixed terminal, and is used for a fixed terminal. The third frame 530 includes data for supporting the mobile terminal. It is a frame to be used.

On the other hand, there are various kinds of data in the data supporting the fixed terminal. For example, the data supporting the fixed terminal can be variously classified according to the area, the channel environment, whether the emergency alert message is included, and the like. Of course, the data supporting the mobile terminal can also be distinguished from various kinds of data as described above.

The second frame 520 includes the PLP2 for supporting the fixed terminal and is shown in mode 1, but it is different from the PLP0 and the PLP1 included in the first frame 510 and is the same as the first frame 510 , But it is distinguished according to the area, the channel environment, and the like.

It should be noted that the various kinds of data inserted in a plurality of frames are distinguished from data for a fixed terminal and data for a mobile terminal only by way of example, Whether or not it can be distinguished by various criteria.

Each of the preamble symbols inserted in each of the plurality of frames may include position information of a frame in which data of the same type is inserted. The position information may include position information of a frame of the shortest distance among a plurality of subsequent frames And information on the number of frames and length information existing between the frame and the frame.

That is, the transmitting apparatus 100 may transmit information to the receiving apparatus (not shown) together with the data for notifying when a frame including the same data as the data included in the frame currently being received is received. If the transmitting apparatus 100 does not transmit information for notifying when a frame including the same data is received to a receiving apparatus (not shown) together with the data, the receiving apparatus (not shown) transmits a preamble symbol It is necessary to check whether the same data is included in the decoded data, which is disadvantageous in terms of power consumption and processing speed.

Accordingly, the preamble symbol according to an exemplary embodiment of the present invention may include position information on the same mode, i.e., where the frame including the same data is located.

Among the plurality of subsequent frames in which data of the same type as the number of frames existing between the frame of the shortest distance among the plurality of subsequent frames in which data of the same kind is recorded, as described above, It is about the length up to the frame of distance. Here, the number of frames is information required to tell whether a frame containing the same type of data comes after a few frames, and the length up to the frame with the shortest distance is the information of the current frame Is the information necessary to inform the length from the end of the frame to the beginning of the frame containing the next kind of data.

Specifically, PLP0 and PLP1, which are the same kind of data, are included in the data areas 512 and 542 of the first frame 510 and the fourth frame 540 in FIG. Accordingly, the fourth frame 540 may be one of a plurality of subsequent frames in which data of the same kind as the first frame 510 is recorded. Also, since the subsequent frames 520 and 530 of the first frame 510 do not include PLP0 and PLP1, which are the same kind of data as the first frame 510, the fourth frame 540 includes the first frame 510 510 is the first one among a plurality of subsequent frames in which data of the same kind is recorded.

Accordingly, the fourth frame 540 is a frame of the shortest distance among a plurality of subsequent frames in which data of the same kind as the first frame 510 is recorded.

On the other hand, the number of frames existing between the first frame 510 and the fourth frame 540 is 2.

In addition, since DVB-T2 has 64/7 Mhz per sample on DVB-T2, it can be seen that the time of one sample is 7/64 μs, so that the reference interval on DVB-T2 can be set to 7/64 μs .

The length from the end of the first frame 510 to the beginning of the fourth frame 540 can be represented by a multiple of 7/64 μs. For example, if the second frame 520 and the third frame 530 each correspond to 1000 samples, 7/64 μs * 2000 is the length from the end of the first frame 510 to the start of the fourth frame 540 .

The number of frames existing between the frame 510 and the fourth frame 540 is 2 and the number of frames between the frame 510 and the fourth frame 540 is 2 from the end of the frame 510. In the preamble symbol 511 inserted in the first frame 510, And information indicating that the length up to the start of the fourth frame 540 is 7/64 占 퐏 * 2000.

Specifically, the preamble symbol 0 (511) embedded in the first frame 510 is the frame (540) existing between the fourth frame 540, which is the shortest distance frame among the plurality of subsequent frames in which data of the same kind is recorded, Next_Frame_Interval indicating the number of frames is 2, and Next_Frame_Length indicating the length from the end of the first frame 510 to the start of the fourth frame 540 is set to 7/64 占 퐏 * 2000.

Accordingly, a fourth frame 540 in which data of the same type as the first frame 510 is recorded after two frames after receiving the first frame 510 is arranged in the receiving apparatus (not shown) It can be understood that the length up to the frame 540 is 7/64 占 퐏 * 2000.

Although only seven frames 510, 520, 530, 540, 550, 560 and 570 are shown in FIG. 5, for example, the same type of data The preamble symbol 3 (541) inserted in the fourth frame 540 is a frame of the shortest distance among the plurality of subsequent frames in which data of the same kind is recorded, Next_Frame_Interval indicating the number of frames existing between the 8th frame (not shown) If 7/64 μs * 3000 is the number of samples of the eighth frame 540 at the end of the fourth frame 510, if the fifth frame 550, the sixth frame 560 and the seventh frame 570 correspond to 1000 samples each, It means the length to the beginning. Next_Frame_Length indicating the length from the end of the fourth frame 540 to the start of the eighth frame (not shown) may include position information set to 7/64 占 퐏 * 3000.

Also, since the second frame 520 includes the PLP2 of mode 1 and the frame of the shortest distance among the plurality of subsequent frames in which data of the same kind is recorded is the fifth frame 550, 520 has a Next_Frame_Interval of 2 indicating the number of frames existing between the fifth frame 550 and the preamble symbol 1 inserted in the second frame 520 from the end of the second frame 520 to the start of the fifth frame 550 And Next_Frame_Length indicating the length may be set to 7/64 占 퐏 * 2000.

The preamble symbols inserted in other frames may include position information as described above.

6 is a view for explaining a method of representing position information according to an embodiment of the present invention.

Referring to FIG. 6, three frames are shown, and it can be seen that preamble symbols are inserted in every frame. The first frame is a Fixed 1 Frame including data for a fixed terminal, the second frame is a Mobile 1 Frame including data for a mobile terminal, the third frame is a Fixed 1 frame including data for a fixed terminal, Frame.

Therefore, the preamble symbol 0 inserted in the first frame is the number of frames existing between the same type of data and the third frame which is the frame of the shortest distance among the plurality of subsequent frames in which the data for the fixed terminal is recorded Next_Frame_Length 630 indicating the length from the end of the first frame to the start of the third frame is set to 7/64 占 퐏 may be included.

In order to reduce the number of bits for storing the Next_Frame_Length 630, the Next_Frame_Length 630 stores the length (T_preamble) 610 of the preamble symbol in the Next_Frame_Length 630 (T_frame_1) 620 of the data area excluding the data area.

Accordingly, in the receiving apparatus (not shown), the value of Next_Frame_Length 630 is compensated for the length (T_preamble) 630 of the actual preamble symbol to compensate for the shortest distance among the plurality of subsequent frames The actual length can be calculated. A detailed description thereof will be described later.

Meanwhile, as another embodiment for reducing the number of bits for storing Next_Frame_Length, a common divisor M of lengths of all frames may be defined, and Next_Frame_Length may be expressed by a multiple of M. Specifically, Next_Frame_Length can be expressed as Next_Frame_Length '* M.

7 is a diagram illustrating fields included in L1 pre-signaling according to an embodiment of the present invention.

8 is a diagram illustrating a field for indicating the type of data included in the L1 post signaling according to an embodiment of the present invention.

That is, the preamble symbol may include Next_Frame_Interval and Next_Frame_Length indicating the number information and length information of frames existing between the frames of the shortest distance among the plurality of subsequent frames in which data of the same kind is recorded, Next_Frame_Interval 710 and Next_Frame_Length 720 are inserted into the L1 pre-signaling of the symbol.

In FIGS. 5 and 6, the reference interval is set using the time (7/64 .mu.s) of one sample used on the DVB-T2. However, the reference interval is not limited thereto and may be defined differently.

The preamble symbol inserted in each of the plurality of frames may include an indicator field indicating whether data inserted in the frame is for a fixed terminal or for a mobile terminal.

Referring to FIG. 8, a TARGET_DEVICE 810 for indicating the type of indicator field data indicating whether data inserted in a corresponding frame is for a fixed terminal or for a mobile terminal is inserted in the L1 post signaling .

On the other hand, the preamble symbol may include a field for directly setting a target device, and may include a field for receiving only a fixed terminal, receiving only a mobile terminal, or setting a reception state of a fixed terminal or a mobile terminal simultaneously .

7 and 8 illustrate the L1 pre-signaling and the L1 post signaling as an example, the fields (TARGET_DEVICE 810, Next_Frame_Interval 820, Next_Frame_Length 830) regarding the position information are limited to the above example, It does not.

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

9, a receiving apparatus 900 includes a receiving unit 910, a signaling processing unit 920, and a signal processing unit 930.

The receiving unit 910 can receive a plurality of frames including a preamble symbol and data.

The signaling processing unit 920 can extract the signaling information from the received frame. In particular, the signaling processor 920 can extract and decode the L1 signaling to obtain location information. For this, the signaling processor 920 can detect and decode the P2 symbols including the L1 signaling.

Specifically, the signaling processing unit 920 can detect the position information of a frame in which data of the same kind is inserted, from a preamble symbol of a frame in which data of a predetermined type is inserted among a plurality of frames. Here, the predetermined kind of data may be set to be supportable by the receiving apparatus 900 or may be desired data.

Then, the signal processing unit 930 can selectively process a frame in which data of the same kind as data of a predetermined type is inserted based on the detected position information. For example, the frame process can perform demodulation, frame de-builder, BICM decoding, and input de-processing.

In particular, the signal processing unit 930 extracts the PLP and decodes the PLP, and based on the information about the protocol version of the frame provided by the signaling processing unit 920, the information about the type of the frame, Thereby generating an L2 packet from the error-corrected L1 packet.

FIG. 10 is a block diagram specifically illustrating a signal processing unit according to an embodiment of the present invention.

10, the signal processing section 930 includes a demodulator 931, a decoder 932, and a stream generator 933.

The demodulator 931 demodulates the received RF signal according to the OFDM parameter to perform sync detection. When the sync is detected, the demodulator 931 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 932 decodes the input data. In this case, the decoder 932 can obtain parameters such as the FEC scheme and the modulation scheme for the data stored in each data area using the signaling information, and perform decoding. Also, the decoder 932 can calculate the start position of data based on the data information included in the configurable post signaling and the dynamic post signaling. That is, it is possible to calculate at which position of the frame the corresponding PLP is transmitted.

The stream generator 933 can process the BB frame (BB FRAME) input from the decoder 932 to generate data to be serviced.

The stream generator 933 can generate an L2 packet from the error-corrected L1 packet based on the location information provided by the signaling processing unit 920. [

Specifically, the stream generator 933 may include de-jitter buffers, which determine the precise timing for restoring the output stream based on the value of the position information of the frame provided in the signaling processing unit 920 Regenerated. Thus, a delay for synchronization between a plurality of PLPs can be compensated.

Meanwhile, the signaling information includes pre-signaling and post-signaling, and post signaling includes configurable post-signaling and dynamic post-signaling. .

8, the post signaling may include a TARGET_DEVICE 810, a Next_Frame_Interval 820, and a Next_Frame_Length 830.

On the other hand, the signal processor 930 can selectively process a frame in which data of the same kind as data of a predetermined type is inserted based on the detected position information, wherein the meaning of selectively processing is the detected position information A frame in which data of the same kind as data of a predetermined type is inserted is processed according to the preset type and a frame in which data of a different type and data of a predetermined type are inserted may not be processed.

As described in the receiver 100, the position information includes the number information and the length information of frames existing between the frames of the shortest distance among a plurality of subsequent frames in which data of the same type is recorded. Since this has been described in advance, a detailed description will be omitted.

Meanwhile, when the receiving unit 910 receives a plurality of frames including a preamble symbol and data, the signal processing unit 930 of the receiving apparatus 900 according to an exemplary embodiment of the present invention transmits the frame of the same type of data It is possible to selectively process frames in which the same type of data as the data of the predetermined type is inserted based on the detected position information. However, the signaling processing unit 920 can also process the same kind of data The receiving unit 910 may detect the position of the inserted frame and provide the detected position information to the receiving unit 910. Accordingly, the receiving unit 910 receives the position information of the predetermined type based on the position information provided from the signaling processing unit 920, Only the frame in which data of the same type as the data of the same type as the data of the same type as the data of the same type is inserted is received . Accordingly, the signal processing unit 930 can perform processing only on a frame in which the same kind of data received through the receiving unit 910 is inserted.

That is, the signal processing unit 930 may selectively process the received data in accordance with whether the same kind of data as the predetermined type of data is inserted, or whether the same kind of data and other data are inserted, or the receiving unit 910 Or may be selectively received.

11 is a view for explaining operations of a receiving apparatus according to an embodiment of the present invention.

Referring to FIG. 11, the receiving apparatus 900 is set to receive PLP0, and data of a predetermined type is set to PLP0.

Accordingly, the receiving apparatus 900 operates only for the first frame, the third frame and the fifth frame in which PLP0 is inserted among the plurality of frames, and the second frame, which is a frame including PLP0 and other types of data, It can be seen that the receiving apparatus 900 is not operated for the fourth frame and the sixth frame so that the frame can be selectively received and processed.

11, it is assumed that the receiving apparatus 900 receives only a frame including a predetermined type of data among a plurality of frames. However, as described above, when the receiving unit 900 of the receiving apparatus 900 receives all The signal processing unit 930 may selectively process a frame including a predetermined type of data among all the plurality of received frames based on the positional information even when a plurality of frames are received.

Meanwhile, the data inserted in the plurality of frames may include at least one of the first data for the fixed terminal and the second data for the mobile terminal. The predetermined type of data may be, for example, first data for a fixed terminal if the receiving apparatus is a fixed terminal and second data for the mobile terminal if the receiving apparatus is a mobile terminal.

In addition, the preamble symbol inserted in each of the plurality of frames may include an indicator field indicating whether data inserted in the corresponding frame is for a fixed terminal or for a mobile terminal.

In addition, the preamble symbol may include a field for directly setting a target device, and may include a field for receiving only a fixed terminal, receiving only a mobile terminal, or setting a receiving state of a fixed terminal or a mobile terminal simultaneously .

On the other hand, as described in the receiver 100, the position information detected by the signaling processing unit 920 includes information on the number of frames existing between the frames of the shortest distance among a plurality of subsequent frames in which data of the same type is recorded And the length information. Accordingly, the signal processor 930 can calculate the time corresponding to the shortest distance based on the number information and the length information of the frame.

Specifically, the signal processing unit 930 can calculate the time corresponding to the shortest distance by the following equation.

6, since the preamble symbols are commonly included in all the frames, the Next_Frame_Length 630 indicates the length of the preamble symbol in the Next_Frame_Length 630 in order to reduce the number of bits for storing the Next_Frame_Length 630, (T_frame_l) 620 except for the length of the preamble symbol (T_preamble) 610. Accordingly, the signal processing unit 930 can store the same kind of data in the length (T_preamble) 610 of the preamble symbol (T_frame_1) 620 excluding the length (T_preamble) 610 of the preamble symbol, which is multiplied by the number of frames existing between the frame of the shortest distance among the plurality of subsequent frames, Next_Frame_Length 630 to determine the actual interval between the frames of the shortest distance among the plurality of subsequent frames in which the same kind of data is recorded Can.

On the other hand, the actual interval can be expressed based on the reference interval expressed in terms of time, so that the signal processor 930 can calculate the actual interval corresponding to the shortest distance in time, It can be determined whether to process the frame containing the data.

As another embodiment for decreasing the number of bits for storing Next_Frame_Length, Next_Frame_Length may be expressed as a multiple of M by defining a common divisor (M) of lengths of all frames. Specifically, Next_Frame_Length is expressed as Next_Frame_Length '* M In this case, the signal processing unit 930 can calculate the time corresponding to the shortest distance by the following equation.

On the other hand, the signal processing unit 930 can maintain a standby state during the calculated time, and can operate in a steady state in which the frame with the shortest distance is processed after the calculated time has elapsed.

That is, the signal processing unit 930 performs a wait state in which the frame processing is not performed for the calculated time, with respect to a frame existing between the shortest distance frame and a plurality of subsequent frames in which data of the same type as the corresponding frame is recorded And may operate in a steady state to perform frame processing for the shortest distance frame among a plurality of subsequent frames in which the same kind of data is recorded after the calculated time has elapsed.

12 is a view for explaining an operation of a receiving apparatus supporting a mobile terminal according to an embodiment of the present invention.

Referring to FIG. 12, the signal processing unit 930 of the receiving apparatus 900 may selectively process a frame including data supporting the mobile terminal among a plurality of received frames.

Specifically, the receiving unit 910 receives a plurality of frames including data supporting a fixed terminal or data supporting the mobile terminal, and the signaling processor 920 receives a plurality of frames including data supporting the fixed terminal or data supporting the mobile terminal, The number of frames and the length information between the frames of the shortest distance among the plurality of subsequent frames in which the data supporting the frame is recorded.

In FIG. 12, Next_Frame_Interval representing the number of frames existing between the frame and the shortest distance among the plurality of subsequent frames in which data supporting the mobile terminal is recorded is 3. If the frame existing between the frame and the frame having the shortest distance corresponds to 1000 samples, the distance Next_Frame_Length may include position information set to 7/64 占 퐏 * 3000. Here, the time of one sample on DVB-T2 was used as described above.

In another embodiment, when the length of the preamble is expressed by excluding the length of the preamble in order to reduce the number of bits of Next_Frame_Length, Next_Frame_Length represents distance information of 7/64 μs * 2700.

Accordingly, the signal processing unit 930 can process the frame only for the shortest distance among the plurality of subsequent frames in which data supporting the mobile terminal is recorded after the elapse of the time based on the calculated actual distance.

The signal processing unit 930 may not process a plurality of subsequent frames in which data is recorded, rather than data supporting the mobile terminal, for a time based on the calculated actual distance.

In addition, the signal processing unit 930 can selectively reduce the power consumption by selectively processing only frames in which the same type or desired data is recorded.

13 is a flowchart illustrating a method of controlling a transmitting apparatus according to an embodiment of the present invention.

According to the control method of the transmitting apparatus shown in Fig. 13, first, a plurality of frames into which at least one kind of data is inserted can be generated (S1410).

Then, a preamble symbol including positional information of a frame in which data of the same kind is inserted into each of a plurality of frames may be inserted (S1420).

Here, the position information may include the number information and the length information of frames existing between the frames of the shortest distance among a plurality of subsequent frames in which data of the same kind is recorded.

In addition, at least one kind of data may include at least one of first data for a fixed terminal and second data for a mobile terminal.

The preamble symbol inserted in each of the plurality of frames may include an indicator field indicating whether the data inserted in the frame is for a fixed terminal or for a mobile terminal.

Then, a plurality of frames in which the preamble symbols are inserted can be transmitted (S1430).

14 is a flowchart illustrating a method of controlling a receiving apparatus according to an embodiment of the present invention.

According to the control method of the receiving apparatus shown in Fig. 14, first, a plurality of frames in which a preamble symbol and data are inserted can be received (S1510).

In step S1520, position information of a frame into which data of the same type is inserted can be detected from a preamble symbol of a frame in which a predetermined type of data is inserted among a plurality of frames.

Here, the position information may include the number information and the length information of frames existing between the frames of the shortest distance among a plurality of subsequent frames in which data of the same kind is recorded.

Then, a frame in which data of the same kind as data of a predetermined type is inserted can be selectively processed based on the position information (S1530).

Here, the processing step can calculate the time corresponding to the shortest distance based on the number information and the length information of the frame.

In addition, the step of processing may operate in a steady state in which a standby state is maintained during the calculated time, and a frame of the shortest distance is processed after the calculated time has elapsed.

In addition, the data inserted in the plurality of frames may include at least one of the first data for the fixed terminal and the second data for the mobile terminal.

The preamble symbol inserted into each of the plurality of frames may include an indicator field indicating whether data inserted in the frame is for a fixed terminal or for a mobile terminal.

Meanwhile, a non-transitory computer readable medium having a program for sequentially performing the control method according to the present invention may be provided.

For example, a program for performing a step of generating a plurality of frames into which at least one kind of data is inserted, a step of inserting a preamble symbol in each of a plurality of frames, and a step of transmitting a plurality of frames in which a preamble symbol is inserted are stored A non-transitory computer readable medium may be provided.

In addition, for example, a method may include receiving a plurality of preamble symbols and a plurality of frames in which data is inserted, obtaining positional information of a frame in which data of the same type is inserted from a preamble symbol of a frame in which predetermined types of data are inserted, A non-transitory computer readable medium may be provided in which a program for performing a step of selectively detecting a frame in which data of the same kind as the data is inserted based on the detecting step and the positional information 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 device 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 in form and details may be made therein without departing from the spirit and scope of the present invention.

100: transmitting apparatus 110: frame generating unit
120: preamble symbol inserting unit 130:
900: Receiver 910: Receiver
920: Signaling processor 930: Signal processor

Claims (20)

In the transmitting apparatus,
A frame generator for generating a plurality of frames into which at least one kind of data is inserted;
A preamble symbol inserter for inserting a preamble symbol into each of the plurality of frames; And
And a transmitter for transmitting a plurality of frames in which the preamble symbol is inserted,
Wherein each of the preamble symbols includes position information of a frame into which data of the same kind is inserted. The method according to claim 1,
The location information may include:
And length information indicating the number of frames existing between the frame of the shortest distance among the plurality of subsequent frames in which the same type of data is recorded. The method according to claim 1,
Wherein the at least one kind of data comprises:
A first data for a fixed terminal, and a second data for a mobile terminal. The method of claim 3,
Wherein the preamble symbol inserted in each of the plurality of frames includes an indicator field for indicating whether data inserted in the frame is for a fixed terminal or for a mobile terminal. In the receiving apparatus,
A receiver for receiving a plurality of frames including a preamble symbol and data;
A signaling processing unit for detecting position information of a frame in which data of the same kind is inserted from a preamble symbol of a frame in which data of a predetermined type is inserted among the plurality of frames; And
And a signal processing unit for selectively processing a frame in which data of the same kind as that of the preset kind of data is inserted based on the position information. 6. The method of claim 5,
The location information may include:
And information on the number of frames and length information existing between the frames of the shortest distance among the plurality of subsequent frames in which the same kind of data is recorded. The method according to claim 6,
The signal processing unit,
And calculates a time corresponding to the shortest distance based on the number information and the length information of the frame. 8. The method of claim 7,
The signal processing unit,
Wherein the control unit operates in a steady state in which a standby state is maintained during the calculated time and a frame of the shortest distance is processed after the calculated time elapses. The method according to claim 6,
The data includes:
The first data for the fixed terminal and the second data for the mobile terminal. 10. The method of claim 9,
Wherein the preamble symbol inserted in each of the plurality of frames includes an indicator field indicating whether data inserted in the frame is for a fixed terminal or for a mobile terminal. Generating a plurality of frames into which at least one kind of data is inserted;
Inserting a preamble symbol in each of the plurality of frames; And
And transmitting a plurality of frames in which the preamble symbol is inserted,
Wherein each of the preamble symbols includes position information of a frame into which data of the same type is inserted. 12. The method of claim 11,
The location information may include:
And information on the number of frames and length information existing between the frame of the shortest distance among the plurality of subsequent frames in which the same kind of data is recorded. 12. The method of claim 11,
Wherein the at least one kind of data comprises:
The first data for the fixed terminal and the second data for the mobile terminal. 14. The method of claim 13,
Wherein the preamble symbol inserted in each of the plurality of frames includes an indicator field for indicating whether data inserted in the frame is for a fixed terminal or for a mobile terminal. Receiving a plurality of frames into which preamble symbols and data are inserted;
Detecting position information of a frame in which data of the same type is inserted from a preamble symbol of a frame in which data of a predetermined type is inserted among the plurality of frames; And
And selectively processing a frame in which data of the same kind as the predetermined type of data is inserted based on the position information. 16. The method of claim 15,
The location information may include:
And information on the number of frames and length information existing between the frame of the shortest distance among the plurality of subsequent frames in which the same kind of data is recorded. 17. The method of claim 16,
Wherein the processing comprises:
And calculates a time corresponding to the shortest distance based on the number information and the length information of the frame. 18. The method of claim 17,
Wherein the processing comprises:
Wherein the control unit operates in a steady state in which a standby state is maintained during the calculated time and a frame of the shortest distance is processed after the calculated time elapses. 17. The method of claim 16,
The data includes:
A first data for a fixed terminal, and a second data for a mobile terminal. 20. The method of claim 19,
Wherein the preamble symbol inserted in each of the plurality of frames includes an indicator field indicating whether the data inserted in the frame is for a fixed terminal or for a mobile terminal.

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