KR20080101592A - Method of transmitting and receiving service guide information and apparatus for transmitting and receiving service guide information - Google Patents

Abstract

A service guide information transceiving method and a service guide information transceiving apparatus are provided to obtain service guide information effectively and supply detailed information with regard to the contents. When a fragment of service guide information is received through an interactive channel, a receiving unit(510) receives and demodulates a signal including fragment management information. A fragment management information includes link information with regard to a location of a fragment. A controlling unit(600) demodulates the signal demodulated by the receiving unit. And the controlling unit displays service guide information including the fragment management information. A display unit(560) displays link information among the service guide information according to the control of the controlling unit.

Description

Method of transmitting and receiving service guide information and apparatus for transmitting and receiving service guide information}

1 is a diagram illustrating an example of service guide information;

2A is a diagram showing an example of a format of management information for managing a fragment;

2B is a diagram illustrating a value of a fragment reference according to the fragment reference format.

2C is a diagram illustrating a structure of a fragment reference when receiving a fragment of service guide information from a broadcast channel.

2d illustrates a structure of a fragment reference when receiving a fragment of service guide information from an interactive channel

3 is a diagram illustrating an embodiment of a transmitting device for transmitting service guide information;

4 is a diagram illustrating the modulation and coding unit disclosed in FIG. 3.

5 is a diagram illustrating signal arrangement according to a result of the frame forming unit forming a frame in the example of FIG. 4;

6 is a diagram illustrating an example in which a broadcast program, content and data are transmitted through a channel.

7 and 8 illustrate a receiving device for receiving service guide information.

FIG. 9 illustrates an example of a protocol stack to follow when service guide information is delivered.

10 is a view showing an embodiment of a method of transmitting and receiving service guide information according to the present invention.

The present invention relates to a service guide information transmission and reception method and a service guide information transmission and reception apparatus.

Content refers to content or information including images, sounds, and text to a user via wired or wireless communication. Recent content is digitally produced and provided through various broadcast channels and interactive channels. For example, a user may download and watch content watched through a broadcast through the Internet. As the broadcasting system and the communication system are converged, a method of receiving the same contents from the broadcasting system and the communication system is being considered.

An object of the present invention is to provide a service guide information transmission and reception method and a service guide information transmission and reception apparatus capable of efficiently obtaining service guide information and providing detailed information on content.

In order to achieve the above object, according to the present invention, when a fragment of service guide information is received in an interactive channel, the present invention receives and demodulates a signal including fragment management information having link information on a location of the fragment in the service guide information. Receiving the service guide information including decoding the demodulated signal and controlling to display service guide information including the fragment management information and expressing the link information among the service guide information according to the control; Provide a method.

In another aspect, when the fragment of the service guide information is received in the interactive channel, encoding the fragment management information having link information on the position of the fragment in the service guide information, the encoded service guide information and A service guide information transmission method comprising multiplexing content data and modulating, encoding, and transmitting the multiplexed service guide information is provided.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Hereinafter, information related to such serviced content and accessing the content is referred to as service guide information.

The service guide information includes both schedule information for each service that allows the user to select a service, or information that allows the user to purchase, access, and store items in the terminal. The user may be provided with service guide information through the terminal, and may select or purchase a desired service. Here, an interactive channel means a channel capable of bidirectional communication, and a broadcast channel or a broadcast channel means a channel for unidirectional communication without specifying a user during multicast.

The service guide information is a first process (hereinafter referred to as a bootstrap process) of recognizing whether the terminal can use the service guide information or how to obtain the service guide, and a second process of the terminal obtaining and processing the service guide information (hereinafter, Acquisition process, the terminal may be processed by a third process of updating the service guide information obtained by the terminal (hereinafter, an update process).

After obtaining the information for the first process from the received signal, the terminal may use the information as trigger information to obtain service guide information. Hereinafter, the information obtained in the first process is referred to as bootstrap information. The terminal may obtain respective service guide information through the bootstrap information, and may obtain information about each service or access content from the service guide information.

1 is a diagram illustrating an example of service guide information. The basic structure of the service guide information will be described with reference to FIG. 1.

The service guide information may be provided to the user in subdivided units. Here, the subdivided sub-unit of the service guide information is called a fragment. The example of FIG. 1 shows a service fragment, a ScheduleEvent fragment, a content fragment, a service bundle fragment, a purge fragment, a purseChannel fragment, and an acquisition. It contains a fragment. Arrows in FIG. 1 indicate reference relationships. According to the example shown in FIG. 1, the service fragment may refer to a service bundle fragment. The number illustrated above each arrow represents the possible number of each subunit information. For example, 0 ... n means that the subunit contains from 0 to n (n is any natural number).

The service fragment contains information about a service provided to the user, for example, a service such as one conventional television channel. The service bundle fragment contains information about a service group. The service group may be, for example, a sports service bundle, a cinema service bundle, or the like. The content fragment includes metadata about the content. For example, the type of A / V, text, image, etc. for the content may be included in the content fragment.

The schedule event fragment includes schedule information about one content of the service. For example, the broadcast time of the content may correspond to this. The furniture fragment includes information related to the purchase of a service that a user can purchase. The aperture channel refers to an interface through which a terminal or a user communicates with a purchase system. The aperture channel fragment includes information related to the purchase system and parameters related to the purchase system.

An Acquisition Fragment contains information related to access of a service or content. A user may access and purchase a service or content through information related to an acquisition fragment through service guide information from a terminal.

The service guide information may have a layered structure, and each subunit of the layered structure is called a fragment. Each fragment may be encoded so that one or more fragment units may be encapsulated or formed into one larger unit and transmitted. This encapsulated unit is called a container. The container of the service guide information may be transmitted and received according to a protocol for transmitting the service guide information. Such a transmission and reception system is illustrated in FIGS. 3, 4, 7 and 8, respectively, and the transmission and reception protocol is illustrated in FIG. 9.

Meanwhile, as described above, the service guide information may be obtained from the bootstrap information. Hereinafter, the process of receiving the bootstrap information of the service guide information will be described.

The INT / IP notification table (INT) of one or more table information transmitted in a section of a broadcast signal is defined between an IP address of an IP (internet protocol) stream and a PID (packet identifier) of the transport stream in a transport stream of the broadcast signal. Contains mapping information. When the terminal obtains the IP address for receiving the bootstrap information of the service guide information from the INT, which is mapping information from the broadcast signal, the terminal receives the bootstrap information using the obtained IP address from the program number (program_number) on the defined PMT. You can see the packet ID. When the packet corresponding to the packet ID is MPE encapsulated, the terminal may decapsulate the MPE to obtain bootstrap information.

The service guide information transmitted by the bootstrap information may be transmitted according to Asynchronous Layered Coding / Layered Coding Transport (ALC / LCT) in, for example, a File Delivery over Unidirectional Transport (FLUTE) session running on an IP protocol. Examples of protocols through which service guide information may be conveyed are illustrated in detail in FIG. 9.

The terminal can obtain bootstrap information for the service guide information from the IP address described in the table information (for example, INT) according to the PSI / SI. For example, if the IP address is in the IP version 4 format, 224.0.23.14 From IP address 6, bootstrap information can be obtained from FF0X: 0: 0: 0: 0: 0: 0: 12D.

The service guide information may be transmitted through a broadcast channel or an interactive channel. In addition, some of the service guide information may be transmitted through a broadcast channel, and the rest may be transmitted through an interactive channel. If the service guide information is divided into a broadcast channel and an interactive channel, the service guide information may be informed that the service guide information is transmitted from another channel to the service guide information transmitted through one channel. The service guide information may be divided and transmitted in a predetermined unit. For example, when the service guide information is divided and transmitted in a fragment unit, the service guide information may be provided to manage the fragment.

2A shows an example of the format of management information for managing a fragment. Fragment management information provides an encapsulation mechanism for fragments by assigning an identifier and version information to a fragment of service guide information in the set, for a set of fragments of service guide information. do. Thus, there may be one fragment management information structure for one container.

The encapsulation structure information (encapsulation_structure) for the fragment that provides the encapsulation mechanism for the fragments includes information about each fragment according to the encapsulation header and the fragment count (fragment_count). The encapsulation header includes fragment reference format (fragment_reference_format) information (a) indicating information related to the format and interpretation of the fragment reference field.

In addition, the information on each fragment includes a fragment reference, a fragment version (fragment_version), and a fragment identifier (fragment_id). The fragment reference provides reference information that encapsulates the fragment of the service guide information. The interpretation of this field is described in the fragment_reference_format information above, and the specific fragment_reference_format information of the fragment reference is provided. The value is illustrated in FIG. 2B. The fragment version (fragment_version) is identification information for identifying the version of the fragment of the encapsulated service guide information, the fragment identifier (fragment_id) is an identifier for identifying the fragment of the service guide information.

2B illustrates a value of a fragment reference according to a fragment reference format. The fragment reference format is a value indicating that an fragment is transmitted to a broadcast system that transmits service guide information, and 0x21 is an unspecified area from 0x00 to 0x20. For example, 0x21 may indicate that the fragment of the service guide information is transmitted to the DVB-H system of the broadcasting system. And, 0x22 may indicate that the fragment of the service guide information transmitted on the interactive channel is transmitted. For example, 0x22 indicates that fragments of service guide information include Global System for Mobile Communications (GSM), Universal Mobile Telecommunications Systems (UMTS), General Packet Radio Service (GPRS), General Packet Radio Service (GPRS), and Code Division Multiple Access (CDMA). 2) and a wired / wireless channel capable of bidirectional communication such as wireless-fidelity (Wi-Fi). In addition, 0x23 to 0xE0 may be used as an unspecified area and 0xE1 to 0xFF may be used as a user defined area.

2C is a diagram illustrating a structure of a fragment reference when receiving a fragment of service guide information from a broadcast channel (that is, when fragment_reference format = 0x21). If the service guide information is transmitted through the broadcast channel according to FIG. 2A, the fragment reference of FIG. 2C may include a type (esg_fragment_type) of the encapsulated fragment illustrated in FIG. 2A and a location where the fragment is stored in the service guide information. esg_data_repository_offset).

FIG. 2D is a diagram illustrating a structure of a fragment reference when receiving a fragment of service guide information from an interactive channel (that is, when fragment_reference format = 0x22). The fragment reference includes information (esg_fragment_type) indicating the type of encapsulated fragment shown in FIG. 2A. When the fragment receives the encapsulated fragment through the interactive channel, the fragment may include link information (esg_data_repository_URL) of the location where the fragment is stored and length information (esg_data_repository_URL_length) of the link information.

Accordingly, the transmitting / receiving side may transmit / receive the storage location of the fragment and the storage location information of the fragment when the fragment is transmitted through the fragment management information and the interactive channel according to the fragment management information according to FIGS. 2A through 2D.

3 is a diagram illustrating an embodiment of a transmitting device for transmitting service guide information. An embodiment of a content transmission device will now be described with reference to FIG. 3. In the example of FIG. 3, it is assumed that content is transmitted through a broadcast service.

The broadcast system disclosed in FIG. 3 includes an encoder 310, 320, 330, a multiplexer 340, and a modulator and encoder 350. The encoding unit includes a first encoding unit 310, a second encoding unit 320, and a third encoding unit 330.

The first encoding unit 310 may encode content according to audio, video, and data according to an information transmission protocol such as a transport stream of MPEG-2. Data including service guide information may be transmitted in units including an IP address. The second encoder 320 may encode data including service guide information in an IP datagram format. IP datagram refers to a signal processing format for signaling in packets by an internet protocol, and includes a header including an IP address and a data container for transmitting information. The data container of the packet-based IP datagram may include data such as video, audio, and service guide data. That is, in the example of FIG. 3, the video signal, the audio signal, and the data signal may be transmitted by performing an IP protocol (IP datacasting) method in which the video signal, the audio signal, and the data signal are divided and compressed.

IP data may be encapsulated in multi-protocol encapsulation (MPE) and then embedded in an MPEG-2 trasnport stream (TS). The MPE may be MPE-FEC section data with a forward error correction code (FEC) added. By arranging the transmission signal by a multi-protocol encapsulation-forward error correction (MPE-FEC) scheme, the carrier-to-noise (CN) ratio of the transmission signal can be improved. MPE-FEC data including FEC or MPE data without FEC may include transmission data in an IP data format.

The second encoder 320 may multiplex the IP datagram encapsulated with the MPE using a time slicing technique to reduce power consumption. The multiplexed signal is converted into a transport stream and multiplexed with MPEG-2 transport stream packets carrying video or audio signals.

The second encoding unit 320 may encode service guide information. In this case, the second encoding unit 320 may encode management information of the fragment illustrated in FIG. 2A. The management information of the fragment encoded by the second encoding unit 320 may include location information of each fragment when the terminal receives the fragment from the broadcast channel or the interactive channel. For example, the management information of the fragment encoded by the second encoding unit 320 may include link information on a location where the fragment is stored when receiving the fragment from the interactive channel as illustrated in FIG. 2D.

The third encoder 330 may encode multiplexing information of a stream packet related to a program or a service. The multiplexing information includes table information about PSI / SI (Program Specific Information / Service Information). The table information encoded by the third encoding unit 330 may include INT (IP) including mapping information between a packet ID (PID) including an IP datagram encoded by the second encoding unit 320 and an IP address of the IP datagram. / MAC Notification table).

The multiplexer 340 multiplexes and outputs a transport packet output from the first encoding unit 310, the second encoding unit 320, and the third encoding unit 330, and the modulation and encoding unit 350 The multiplexed signal can be modulated, encoded and transmitted.

When the multiplexer 340 multiplexes and outputs the packet data encoded by the first encoder 310, the second encoder 320, and the third encoder 330, the modulation and coding unit 350 may multiplex the signal. The signal may be modulated and encoded according to the modulation and coding unit 350 according to the transmission system and then transmitted as an RF signal. A detailed example of the modulation and coding unit 350 is detailed in FIG. 4. The modulation and coding unit 350 may follow modulation schemes and encoding schemes of various broadcasting systems. For example, a modulation scheme such as a DMB scheme, a DVB-H scheme, a VSB scheme, and an ISDB-T scheme may be used.

FIG. 4 is a diagram illustrating the modulation and coding unit disclosed in FIG. 3. In FIG. 4, the modulation and coding scheme may follow, for example, a digital video broadcasting-terrestial / handheld (DVB-T / H) scheme.

The first encoder 410 includes an outer coder 411 and an outer interleaver 412. The first encoder 410 may encode and interleave the multiplexed data to improve transmission performance of the multiplexed signal. For example, a Reed-Solomon code conversion method may be used as an outer coding method, and a convolution interleaving method may be performed as an interleaving method.

The second encoder 420 includes an inner coder 421 and an inner interleaver 422. The inner coder 421 and the inner interleaver 422 perform interleaving by recoding a signal to be transmitted in preparation for an error in the transmission signal. The inner coder can encode the transmission signal according to the punctured convolution code, and the inner-interleaving scheme is based on the memory usage according to the transmission modes of 2k, 4k and 8k. Native or in-depth interleaving schemes may be used.

The mapper 430 may transmit a transmission signal such as 16QAM, 64QAM, QPSK, etc. in consideration of a pilot signal and a transmission parameter signal (TPS) according to a transmission mode generated by the system signal generator 425. You can map them to symbols according to the method.

The frame forming unit 440 modulates the mapped signal by an orthogonal frequency division multiplex (OFDM) scheme and forms a frame in which a guard interval is inserted in a data section including the modulated signal. Each frame contains 68 OFDM symbols and four frames form a super frame. Each symbol includes 6817 carriers in 8k mode and 1705 carriers in 2k mode. The guard interval is a cyclic continuation in which data of the data interval is copied, and its length varies depending on the transmission mode. The OFDM frame includes a distributed pilot signal, a continuous pilot signal and a TPS carrier, respectively. An example of a signal frame by the frame forming unit of FIG. 4 is disclosed in FIG. 5.

The digital analog converter 450 converts a broadcast signal in a digital format having a guard interval and a data interval into an analog signal, and the transmitter 460 converts the analog signal converted by the digital analog converter 450 into a radio frequency (RF). ) Can be transmitted by a signal.

5 is a diagram illustrating signal arrangement according to a result of the frame forming unit forming a frame in the example of FIG. 4. In FIG. 5, Tu represents the number of usable subcarriers, Dt represents a distance between distributed pilots on the time axis, and Df represents a distance between distributed pilots on the frequency axis, respectively. The distance Df between the distributed pilots in the frequency domain determines the delay range of the ghost that can be estimated in the channel. 5 shows a signal formed by the frame forming unit up to the position of a pilot to be interpolated upon reception.

Therefore, when receiving the signals arranged in this way, the interpolation is performed at the pilot position, and the symbols are arranged so that the same pilot pattern appears for every four input symbols. That is, if the first input symbol (t = 1) is the same distributed pilot signal as the symbol input at t = 5, the terminal receiving the signal is a symbol received at t = 2, 3, 4 at the position of the distributed pilot signal Time interpolation can be performed for.

Further, since the symbol input at t = 6 has the same distributed pilot pattern as the symbol input at t = 2, the terminal receiving the signal is a distributed pilot of the symbol input at t = 6 and the symbol input at t = 2. Time interpolation may be performed on signals t = 3, 4, and 5 in position.

When the signal is received at time t = 7 and then interpolated in the above manner, the symbols input at t = 4 are distributed pilots at four subcarrier positions, and thus the frequency of the input symbol at t = 4. The interval between the distributed pilot signals in the region is reduced to one quarter of the interval between the original distributed pilot signals, and a symbol input at t = 4 has a pattern in which the distributed pilot signals are located at four subcarrier positions. Thus, the terminal receiving the signal can have the effect of processing the signal as more pilot signals are located in the symbol. Therefore, when the signal is transmitted using the continuous pilot signal and the distributed pilot signal, channel compensation can be adaptively performed according to the state of the reception channel at the time of receiving the signal.

6 illustrates an example in which a broadcast program, content and data are transmitted through a channel. According to the broadcasting system disclosed in FIGS. 3 to 4, a service to which a type slicing scheme is applied to DVB-H and a service transmitted on a common channel of DVB-T and DVB-H may be transmitted. Programs can be transmitted according to channels of respective DVB-H and DVB-T. In case of DVB-H, each service can be transmitted by time division multiplexing by time slicing. Content and service guide information, including video / audio, can be included in IP datagrams by the DVB-H system and transformed into MPE or MPE-FEC and transmitted to MPEG-2 TS with the modified MPE or MPE-FEC embedded. have.

7 and 8 illustrate a receiving apparatus for receiving service guide information. An apparatus for receiving service guide information will be described below with reference to FIG. 7. The apparatus for receiving service guide information includes a receiver, an input unit 530, a storage unit 550, a display unit 560, and a controller 600. The receiver may include a broadcast receiver 510 that receives a signal from a broadcast channel and a communicator 520 that receives a signal from an interactive channel and transmits a signal to the interactive channel. For example, the channel that the communication unit 520 interacts with may be a wired or wireless channel capable of data communication in both directions.

The service guide information receiving apparatus may receive the reception information capable of receiving the service guide information from the broadcast channel or the interactive channel and the location information when receiving the fragment from the interactive channel. For example, the apparatus for receiving service guide information may receive the fragment management information illustrated in FIGS. 2A to 2D and obtain information on whether the fragment is transmitted through a broadcast channel or an interactive channel from the management information.

The broadcast receiver 510 receives, demodulates and outputs a broadcast signal. For example, the broadcast receiver 510 may include a tuner for receiving a broadcast signal according to DVB-H and a demodulator for demodulating a broadcast signal in a DVB-H format according to the OFDM scheme.

The broadcast receiver 510 demodulates the received broadcast signal and outputs the demodulated signal to the controller 600. The service guide information may be received in units of fragments, and the broadcast signal received by the broadcast receiver 510 may include fragment management information illustrated in FIGS. 2A to 2D. The management information of the fragment may include reception information indicating whether the fragment is received from the interactive channel and link information of a location where the fragment is stored when the fragment may be received from the interactive channel. On the other hand, since the service guide information may be received through the interactive channel, the communication unit 520 may receive information indicating whether the fragment is received from the interactive channel, and if the fragment may be received from the interactive channel, the location of the fragment is stored. Fragment management information including link information may be received via an interactive channel.

The broadcast receiver 510 and the communicator 520 output a signal including service guide information to the controller 600.

The controller 600 may include a system decoder 610, a decoder 620, a service guide information controller 630, a channel map storage 640, and a communication system decoder 670. The controller 600 may control the surrounding functional blocks illustrated in FIG. 7 and process a control command received from the user.

FIG. 8 is a diagram illustrating a system decoding unit of the control unit of FIG. 7.

The system decoder 610 may process a broadcast signal received from the broadcast receiver 510. The system decoder 610 may include an IP decapsulator 611, a user datagram protocol (UDP) decoder 612, an RTP decoder 613, and a file delivery over unidirectional transport protocol (FLUTE) decoder 614. ,, A container parser 614, a beam parser 615, and an XML parser 616. The system decoder 610 may decode the fragment management information illustrated in FIGS. 2A to 2D in the broadcast signal received by the broadcast receiver 510. The system decoder 610 may decode content data transmitted in real time in consideration of system encoding. For example, the system decoder 610 may decode a file including content data and service guide information transmitted in an IP datagram format. The service guide information decoded by the system decoding unit 610 includes fragment management information on the fragment of the service guide information. The fragment management information may include reception information indicating that the fragment may be received on the interactive channel. If the fragment can be received through the interactive channel, the fragment may include link information of a location where the fragment is stored.

An example in which the system decoding unit 610 decodes content data or service guide information in the IP datagram format is as follows. First, the IP decapsulator 611 decapsulates the content data included in the payload of the IP packet with reference to the header of the IP packet. The UDP (user datagram protocol) decoder 612 may decode content data transmitted in real time from the IP decapsulated payload according to the user datagram protocol (UDP). The RTP decoder 613 may output the encoded content data by controlling the content data decoded by the UDP (user datagram protocol) decoder 612 to adjust the encoding rate using the RTP control protocol (RTP). The audio / video signal of the content output from the RTP decoder 613 is output to a decoder 620 including an audio decoder and a video decoder, respectively.

When the system decoding unit 610 decodes the data for the service guide information in the file format, the data decoded by the UDP decoding unit 612 is output after the FLUTE decoding 614.

The FLUTE decoding unit 614 may decode data in FLUTE (IETF RFC3926: File Delivery over Unidirectional Transport) format and output files such as binary data, image data, and text. The data decoded and output by the FLUTE decoding unit 614 may include a file including service guide information.

The container parser 615 outputs data obtained by decoding a file of a container unit among the service guide information.

When the service guide information is output from the data output from the container parser 615 in a beam BiM format, the beam BiM parser 616 decodes the data and transmits the data to the XML parser 617. The XML parser 617 may decode an XML format file output by the container parser 615 or the BiM parser 617.

The decoder 620 includes a video decoder and an audio decoder that receive and decode a signal decoded by the system decoder 610. The decoder 620 may include a data decoder which decodes a data signal according to data broadcasting. The video decoder may decode and output the video data in H.264 format, for example, and the audio decoder may decode the audio data in AAC + format, for example. In addition, the decoder 620 may decode program information / service information in a table format according to PSI / SI. For example, the decoder 620 may decode table information such as a program associate table (PAT), a program map table (PMT), a network information table (NIT), or may decode a broadcast signal according to data broadcasting. The decoder 620 may parse INT (IP / MAC Notification table), which is table information, from the PMT. INT contains mapping information between the IP address of the IP stream and the PID of the transport stream in the transport stream. Therefore, when the service guide receiving apparatus obtains an IP address for receiving bootstrap information of service guide information from the INT, the service guide receiving apparatus may receive the bootstrap information by using the obtained IP address. When the service guide receiving apparatus obtains the bootstrap information, the service guide receiving apparatus may receive and decode the service guide information according to the process illustrated in FIGS. 7 and 8. An example of expressing the decoded service guide information is as follows.

The service guide information controller 630 may store, process, and display information related to the service guide that the system decoder 610 decodes and outputs. The service guide information controller 630 may store, process, and display information related to the service guide, which is decoded and output by the system decoder 610. The service guide information controller 630 includes a controller 613, a channel map storage 633, and a browser driver driver 635.

The controller 631 may store the received service guide information in the storage unit 550. The controller 631 may extract channel map information from the service guide information and store the channel map information in the channel map book 633. The controller 631 may drive a browser driver 635 or the like to drive the received or stored service guide information so as to display the service guide information.

The storage unit 550 may store service guide information, a file transmitted as an IP datagram, content data, and may store data before and after the decoder 620 decodes the data. The input unit 530 may receive a control command input by the user and output the control command to the controller 600. The display unit 560 may output an audio or video signal output from the controller 600. In addition, the application driven by the controller 600 may output the image and the sound. For example, the application for the service guide information may provide the service guide information to the user.

The controller 600 may include a communication system decoding unit 670 to transmit and receive an interactive channel. The communication system decoding unit 670 may encode a signal to be transmitted through the interactive channel or may decode a signal received from the interactive channel from the communication unit 520. When the communication unit 520 receives a signal through the interactive channel, the communication unit 520 demodulates the signal. When the communication system decoding unit 670 outputs an encoded signal, the communication unit 520 modulates the signal and transmits it. For example, when the communication unit 520 receives the service guide information from the interactive channel, the communication system decoding unit 670 may receive it, decode it, and output it. When the communication system decoding unit 670 receives the signal including the fragment management information illustrated in FIGS. 2A to 2D from the communication unit 520, the communication system decoding unit 670 decodes the received signal in consideration of the system decoding of the signal. 630).

When the control unit 600 receives the fragment management information from the broadcast receiver 610 or the communication unit 620, the received information on whether the fragment is received on the broadcast channel or the interactive channel and the interactive channel from the fragment management information. In this case, the link information of the location where the fragment is located can be processed. When the fragment 600 is received on the broadcast channel using the reception information and the link information, the controller 600 may process the fragment received by the broadcast receiver 610 and output the fragment to the service guide information controller 630. When the control unit 600 receives the fragment through the interactive channel, the control unit 600 may process the fragment received by the communication unit 620 in the communication system decoding unit 670 and output the fragment to the service guide information control unit 630. That is, when the control unit 600 obtains the service guide information from the broadcast channel, the control unit 600 may decode the signal through the system decoder 610. If the control unit 600 obtains the service guide information from the broadcast channel, the controller 600 may decode the signal through the communication system decoder 670.

When the control unit 600 receives the table information such as INT, the control unit 600 obtains an IP address where the bootstrap information is located. For example, the service guide information receiving apparatus obtains the service guide information received through the interactive channel from the communication unit 520 using the obtained IP address, or the service guide information transmitted through the broadcasting channel from the broadcast receiving unit 510. Can be received.

9 illustrates an example of a protocol stack that follows when service guide information is delivered. In the case of a protocol stack, if service guide information is transmitted according to the DVB-T / H format 710, the transmitted signal follows a protocol related to a transport stream defined in DVB-H. According to DVB-H, the transport stream can follow the time slicing rule (725), and if the transport stream is decoded, the transport stream must conform to the multiprotocol encapsulation (MPE) or multiprotocol encapsulation-forward error correction (MPE-FEC) format (729). It becomes a signal. Although not shown in FIG. 7, information according to PSI / SI may be delivered to the transport stream. The transport stream has a signal according to the format 730 of the IP datagram. The data according to the IP datagram follows the protocol of UDP 740 or TCP. Content transmitted / received in the form of real-time streaming among the contents delivered through UDP may be in accordance with the RTP format 750, and the content delivered in the form of a file may be in FLUTE / ALC format. Streaming content according to the RTP 750 may be encoded and transmitted according to H.264 / AAC +. On the other hand, the content delivered in the form of a file may be data according to XML (eXtensible Markup Language), binary, text, or the like, or may include service guide information according to XML / SDP. XML (eXtensible Markup Language) is an object-oriented language, and the service guide information may be transmitted in a signal layered in units of objects through FLUTE.

10 is a view showing an embodiment of a method of transmitting and receiving service guide information according to the present invention. An embodiment of a method of transmitting and receiving service guide information according to the present invention with reference to FIG. 10 is as follows.

The service guide information having received information indicating that the fragment may be received through the interactive channel and link information on the location of the fragment is encoded and output (S110). The received information and the link information may be generated in the form of an IP datagram and then encoded according to protocols of ALC, FLUTE, and UDP. Signals encoded in IP datagrams can be encapsulated in MPE or MPE-FEC and processed with a time slicing technique. The reception information and the link information may be described with reference to FIGS. 2A to 2D, and the encoding process may be referred to FIG. 3.

The service guide information output is multiplexed with the content data, modulated, and transmitted (S120). The process of modulating and transmitting the service guide information may refer to FIGS. 3 and 4.

Receive and demodulate the transmitted service guide information (S130).

The service guide information may be received through a broadcast channel or an interactive channel. The received signal may include reception information indicating that the fragment may be received through the interactive channel and link information indicating the fragment position when the fragment is received through the interactive channel. The demodulation process of S130 may follow a process performed by the broadcast receiver and the communication unit of FIG. 7.

The received service guide information is decoded to obtain information on a fragment management structure including reception information indicating that a fragment may be received through an interactive channel and link information on the location of the fragment (S140).

Since the fragment of the step S140 is included in the service guide information, reference may be made to the signal processing shown in FIGS. 7 and 8.

Then, the fragment is received through the interactive channel using the link information on the position of the fragment (S150). When receiving a fragment through the interactive channel, the fragment located in the link may be received by connecting to the link information obtained in step S140.

According to the above embodiment, the user may obtain, from the service guide information, fragment management information including link information on the location of the received information fragment indicating that the fragment of the service guide information may be received through the interactive channel. The fragment for the service guide information can be obtained from the fragment management information through the interactive channel. Therefore, detailed information on the use of the content can be obtained, and the service can be easily used.

According to the embodiment disclosed above, the service guide information can be easily obtained from the service guide information through management information that can be obtained through the interactive channel.

Claims (8)

A receiving unit for receiving and demodulating a signal including fragment management information having link information on a location of the fragment, when a fragment of service guide information is received through an interactive channel; A control unit for controlling the receiver to decode the demodulated signal and to display service guide information including the fragment management information; And And a display unit for displaying the link information among the service guide information under the control of the controller. The method of claim 1, The fragment management information further includes version information of the fragment and identification information of the fragment. An encoding unit for encoding fragment management information having link information on a location of the fragment in the service guide information when a fragment of the service guide information is received in the interactive channel; A multiplexer which multiplexes the encoded service guide information and content data; And And a modulation and coding unit for modulating, encoding, and transmitting the multiplexed service guide information. The method of claim 3, wherein And the fragment management information further includes version information of the fragment and identification information of the fragment. Receiving and demodulating a signal including fragment management information having link information on a location of the fragment in the service guide information when a fragment of the service guide information is received in the interactive channel; Decoding the demodulated signal and controlling to display service guide information including the fragment management information; And And displaying the link information among the service guide information according to the control. The method of claim 5, And the fragment management information further includes version information of the fragment and identification information of the fragment. If a fragment of service guide information is received in an interactive channel, encoding fragment management information having link information on the location of the fragment in the service guide information; Multiplexing the encoded service guide information and content data; And And modulating, encoding, and transmitting the multiplexed service guide information. The method of claim 7, wherein And the fragment management information further includes version information of the fragment and identification information of the fragment.

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