KR20080100753A - Broadcasting service transmitting apparatus and method and broadcasting service receiving apparatus and method for accessing broadcasting service effectively - Google Patents

Abstract

A broadcast transmitting apparatus and method for effective access to a broadcast service and a broadcast receiving apparatus and a method thereof are provided to access to a desired service directly and quickly, thereby effectively processing data. A broadcast data packetizing unit(810) packetizes broadcast data of at least one type, so the broadcast data packetizing unit generates at least one broadcast data packet. A transmission packet generating unit(820) generates at least one transmission packet for transmitting at least one broadcast data packet. A transmission frame generating unit(830) generates a transmission frame having a predetermined size fro transmitting at least one broadcast service. At least one broadcast service is made by using at least one transmission packet. A transmitting unit(840) transmits a transmission frame.

Description

Broadcasting service transmitting apparatus and method and broadcasting service receiving apparatus and method for efficient access to broadcasting service

The present invention relates to an apparatus and method for providing a broadcast service composed of various types of data, and more particularly, to a broadcast apparatus and method and a broadcast receiving apparatus and method for direct and quick access to a desired service.

In digital broadcasting, when multiplexing signals of multiple service channels and transmitting them through one transmission path, each channel signal is independently compressed and packetized, and then these packets are multiplexed and transmitted in a transport stream. In this case, the same packet identifier (PID) is assigned to a packet corresponding to one channel so as to be distinguished from a packet of another channel. As such, when packets are distinguished for each channel and assigned with a specific ID number, the receiver selects or demultiplexes only packets of a desired channel using the packet identifier of the channel in the multiplexed transport stream and discards the remaining packets.

1 is a diagram illustrating a process of processing a transport stream generated using a packet identifier.

The receiving apparatus processes the transport stream through a process as shown in FIG. 1. When the encoded transport stream packets are received in step S 110, RS decoding is performed on the transport stream packets in step S 120. In step S 130, filtering of the transport stream packet is performed according to the PID. In step S 140, the transport stream packet is depacketized according to each layer, that is, the transport layer, the packetization layer, and the stream layer. In step S 150, the depacketized and output data are decoded.

This structure has an advantage that each transport stream packet can be clearly distinguished through a value of a packet identifier. However, there is a disadvantage in that a packet identifier must be included in each transport stream packet, the receiving apparatus must perform RS decoding on all transport stream packets, and check and filter the packet identifier.

2 is a diagram illustrating an example of a transport stream generated using a packet identifier.

2 shows that a transport stream packet transmitting A / V data, a transport stream packet transmitting IP data, and a transport stream packet transmitting object data are transmitted in one channel. The conventional method requires outer / RS decoding and PID on all transport stream packets even if a user only wants a specific AV service. Therefore, there is a problem in that a receiver wastes resources in time and space when processing data. have.

An object of the present invention is to provide a broadcast service transmitting apparatus and method and a broadcast service receiving apparatus and method for efficient data processing by enabling direct and quick access to a desired service.

According to an aspect of the present invention, there is provided a broadcast service transmission apparatus, including: a broadcast data packetizer configured to generate at least one broadcast data packet by packetizing at least one type of broadcast data; A transport packet generator configured to generate at least one transport packet for transmitting the at least one broadcast data packet; A transmission frame generation unit generating a transmission frame having a predetermined size for transmitting at least one broadcast service configured using the generated at least one transport packet; And a transmission unit for transmitting the transmission frame, wherein the transmission frame generation unit generates the transmission frame such that service access information for accessing at least one broadcast service transmitted through the transmission frame is included in the transmission frame.

Advantageously, said service access information is located in a predetermined area within said transport frame.

Preferably, the service access information includes location information about the next service access information.

Advantageously, said transport frame comprises at least one virtual data channel distinguished according to a type of data, each of said at least one virtual data channel comprising at least one sub data channel comprised of said at least one transport packet. Include.

Preferably, the service access information is LMT for indicating a physical location for a sub data channel corresponding to a service component constituting at least one broadcast service in the transport frame and at least one broadcast transmitted through the transport frame. It contains the LIT representing the configuration information of the service.

Preferably, the LMT is data type information indicating a configuration for a data type transmitted through the transmission frame, version information indicating a version of the LMT, and a sub data channel indicating the number of sub data channels according to each data type. It includes count information and channel pointer information indicating the position of each sub data channel.

Preferably, the LMT is the same version LMT number information indicating the number of LMTs having the same version as the version of the LMT, LMT pointer information indicating the location of the next LMT, the number of additional data about the at least one broadcast service And at least one of additional data number information indicating a and additional data pointer information indicating a position of each of the additional data.

Preferably, the LIT includes service number information indicating the number of broadcast services transmitted through the transport frame, version information indicating a version of the LIT, and service information indicating a configuration of the broadcast service.

Preferably, the service information includes an LMT index number assigned to channel pointer information indicating a position of each sub data channel included in the LMT.

Preferably, the transmission unit generates and transmits an ATSC frame generated by inserting at least one transmission frame.

According to another aspect of the present invention, there is provided a method of transmitting a broadcast service, the method comprising: generating at least one broadcast data packet by packetizing at least one type of broadcast data; Generating at least one transport packet for transmitting the at least one broadcast data packet; Generating a transport frame having a predetermined size for transmitting at least one broadcast service configured using the generated at least one transport packet; And transmitting the transport frame, wherein in the generating of the transport frame, the transport frame includes service access information for accessing at least one broadcast service delivered through the transport frame. Is generated.

Broadcast service receiving apparatus according to another aspect of the present invention comprises a receiving unit for receiving a transmission frame having a predetermined size; A service for obtaining service access information for accessing at least one broadcast service from the transport frame, and for obtaining at least one transport packet constituting a predetermined broadcast service delivered through the transport frame using the service access information A frame processor; A transport packet processing unit processing the at least one transport packet to obtain at least one broadcast data packet included in each of the at least one transport packet; And a broadcast data processor configured to process the at least one broadcast data packet.

Broadcast service receiving method according to another aspect of the invention, the step of receiving a transmission frame having a predetermined size; Obtaining service access information for accessing at least one broadcast service from the transport frame, and obtaining at least one transport packet constituting a predetermined broadcast service delivered through the transport frame using the service access information; ; Processing the at least one transport packet to obtain at least one broadcast data packet included in the at least one transport packet; And processing the at least one broadcast data packet.

According to the present invention, unlike a method of configuring and providing a service by filtering a packet using a PID, direct access to each service component unit is possible.

In addition, according to the present invention, in selecting the service components constituting the service, RS decoding is performed on all RS-encoded transport packets, and therefore, the PIDs of all packets do not have to be checked. This can prevent wasted system resources.

In addition, according to the present invention, when fixing the position to obtain the LMT and LIT in the transmission frame, it is possible to quickly access the service and service components.

In addition, according to the present invention, the LMT includes information on the next LMT, so that even if the location of the LMT and LIT in the transmission frame is flexible, it is possible to quickly access services and service components.

In addition, according to the present invention, since the LMT includes count information about LMTs of the same version, even if an error occurs in the LMT, the LMT may be restored using the previous LMT.

In addition, according to the present invention, an error packet can be detected without using an error flag by changing the header of an error packet.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

The present invention is used in a deterministic environment in which a broadcast service is provided by transmitting a frame having a constant, i.e., fixed size, according to a predetermined time period. In the present specification, a frame having a constant size is called a transmission frame.

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

The transmission frame 300 according to an embodiment of the present invention is composed of a service information area 310 and a data area 320. The transmission frame 300 of the present invention may be inserted and transmitted as part of an ATSC frame in a broadcasting system such as ATSC, for example, as shown in FIG. 3. Alternatively, the transmission frame according to the present invention may be transmitted independently or may be transmitted mapped one-to-one to a transmission frame of another broadcasting system.

The transmission frame 300 is divided into virtual data channels which are distinguished according to the type of data. The virtual data channel refers to a channel which is further divided by physically dividing a predetermined channel for transmitting a data stream according to a data type. Each virtual data channel may be divided into independent sub data channels. Each sub data channel consists of one or more transport packets (the smallest unit of a packetized data stream in the transport layer).

The service information area 310 includes service access information for accessing data constituting a broadcast service delivered through the transmission frame 300. The service access information may be implemented to be periodically located in a certain area of the frame as shown in FIG. In addition, the insertion period of the service access information may be adjusted or the insertion position may be changed by including the location information about the next service access information in the service access information.

FIG. 4 is a diagram illustrating the structure of a transmission frame shown in FIG. 3 in more detail.

FIG. 4 is a diagram illustrating how the virtual data channel of FIG. 3 is subdivided into sub data channels, and how a service is configured. In FIG. 4, the transport frame includes a signaling packet or signaling virtual data channel 410, a real time media virtual data channel 420, an IP virtual data channel 430, and an object virtual data channel 440.

In FIG. 4, the virtual data channel is divided into sub data channels. In FIG. 4, it is assumed that the data type includes three types of real-time media data, IP data, and object data.

In FIG. 4, the real time media virtual data channel includes sub data channel 1 (R-1) and sub data channel 2 (R-2) for transmitting real time media data such as an A / V stream. The IP data virtual data channel 420 is composed of sub data channel 1 (IP-1) for transmitting IP data. The object virtual data channel 430 is a sub data channel 1 (O-1), a sub data channel 2 (O-2), and a sub data for transmitting object data used in real time or after being received and stored in a broadcast service receiving apparatus. Channel 3 (O-3) and sub data channel 4 (O-4).

A service consists of one or more service components. Therefore, in order to provide a service, a service component constituting the service must be received. The sub data channel is a path for transmitting only one service component. Therefore, in order to access a service, it is necessary to know the location of each sub data channel transmitting each service component.

The service access information for accessing each service component constituting the service is included in the signaling packet 410 of FIG. 4 corresponding to the service information area 310 of FIG. 3. The signaling packet 410 is a packet containing the service access information described with reference to FIG. 3. The signaling packet includes a header field, an LMT field, an LIT field, and a payload, as shown in FIG.

The Location Map Table (LMT) field is a field for providing configuration and physical location information of a sub data channel in a transport frame.

The linkage information table (LIT) shows service configuration information on how many services are transmitted through a transport frame and which sub data channel each service should look at. That is, the LIT is information indicating which one or more sub data channels each service is composed of.

 In FIG. 4, the LIT field indicates that services transmitted through the transmission frame 400 are service 1, service 2, and service 3. In addition, through the LIT field, service 1 is composed of sub data channel 1 (R-1) of real time media, sub data channel R-2 of real time media, and sub data channel 3 (O-3) of object. Indicates.

5A and 5B illustrate a structure of an LMT according to an embodiment of the present invention.

The LMT according to an embodiment of the present invention includes a type bitmap field, a version number field and at least one sub data channel number field.

The type bit map indicates what data is included in a transmission frame transmitted according to a predetermined period. Assume that a transport frame carries object, audio and video data, and IP data.

The type bit map is 3 bits, and each bit may indicate the presence or absence of audio and video, IP data, and object data. For example, when a bit constituting the type bit map is 1, it may indicate that data of a corresponding type exists, and when it is 0, it may indicate that data of a corresponding type does not exist. Therefore, when the type bit map is 111, this indicates a case where audio and video data, IP data, and object data are all included in the transmission frame. When the type bit map is 011, audio and video data do not exist. Indicates that IP data and object data exist.

The version number indicates the version of the LMT.

The sub data channel number indicates the number of sub data channels belonging to each type included in the virtual data channel. The sub data channel number corresponds to the number of channel pointers indicating the physical address of the sub data channel in each virtual data channel. In FIG. 5, the channel pointer for real time media is l, the channel pointer for IP data is m, and the channel pointer for an object is shown as n. Here, l, m and n are integers greater than or equal to zero. For example, when real time media are not transmitted in a transmission frame, a sub data channel number field and a channel pointer field may not exist.

For example, if the type bit map is 100 and the sub data channel number is 2, two fields indicating a channel pointer for the sub data channel for transmitting real-time media are included after the version number field.

In the LMT, the channel pointer field includes information indicating the physical location of each sub data channel. The index number may be sequentially assigned to the channel pointer field. As described above, the numbers sequentially assigned to the channel pointer field in the LMT are referred to as LMT index numbers. The LMT index number is not included in the channel pointer field, and the broadcast reception device may sequentially assign the number to each channel pointer field while interpreting the LMT field. In this case, the LMT index numbers are sequentially assigned regardless of the sub data channel.

If the type bitmap is 011, the sub data channel number for the IP data is 2, and the sub data channel number for the object is 3, the LMT may be configured as shown in FIG. 5B. In FIG. 5B, channel pointers 1 and 2 represent positions of sub data channels with respect to IP data, and channel pointers 3, 4, and 5 represent positions of sub data channels with respect to object data. Here, channel pointers 1 to 5 are LMT index numbers.

However, the sub data channels may be classified according to types, and the LMT index numbers may be sequentially assigned to the sub data channels in each virtual data channel.

In this case, channel pointer 1 and channel pointer 2 are assigned index numbers '1' and '2', respectively. Channel pointers 3, 4, and 5 are assigned index numbers '1', '2', and '3', respectively. Therefore, a problem arises that it is unknown whether the index number '1' corresponds to the channel pointer 1 or the channel pointer 3. In order to solve this problem, more information may be needed to distinguish whether the corresponding index number is for the IP virtual data channel or the object virtual data channel. Information indicating what kind of virtual data channel the index number corresponds to will be described later with reference to FIG. 6B.

5C is a diagram illustrating the structure of an LMT 500 according to another embodiment of the present invention.

According to another embodiment of the present invention, the LMT 500 includes an LMT coverage 501 field, a version number 502 field, an SEP flag 503 field, an LMT boundary 504 field, an SEP pointer 505 field, and a first field. The indicator 506 field, the A / V data channel pointer 507 field, the second indicator 508 field, the IP data channel pointer 509 field, the third indicator 510 field, and the object channel pointer 511 field. Include.

 The LMT coverage 501 indicates the number of other LMTs having the same version as the version of the LMT 500. For example, when the version of the LMT 500 is '1' and the bit value constituting the LMT coverage 501 is '00001', the version is '1' and the number of other LMTs present after the LMT 500 is 'One'.

Version number 502 represents the version of LMT 500.

The SEP flag 503 indicates whether a signaling packet is included in the LMT 500. The signaling packet may be additional data used for processing a transport frame such as LMT and LIT, or may be additional data related to services mounted in the transport frame such as EPG and ESC. If the bit value of the SEP flag 503 is '1', there is an SEP pointer 505 field indicating the location of the signaling packet after the SEP flag 503.

The LMT boundary 504 represents the range of packets that the LMT 500 affects. For example, the LMT boundary 504 is the address of the last packet that the LMT 500 affects, or the LMT 500 affects the LMT 500. The impact may be the number of packets. If the LMT boundary 504 indicates the address of the last packet affected by the LMT 500, all packets up to the address before the address are determined to be packets affected by the LMT 500. This means that a new LMT exists at an address immediately after the address indicated by the LMT boundary 504. Therefore, the LMT boundary 504 can be used to easily predict the location of the next LMT.

SEP pointer 505 indicates the location of the signaling packet.

The first indicator 506 indicates whether a sub data channel exists. If the first indicator 506 is '1', a channel pointer exists after the first indicator 506. In FIG. 5C, the first indicator 506 means that an A / V sub data channel exists.

A / V data channel pointer 507 indicates the position of the A / V data channel.

The second indicator 508 indicates whether there are additional sub data channels. If the second indicator 508 is '1', a channel pointer is present after the second indicator 508. In FIG. 5C, the second indicator 508 means that an IP data channel exists.

IP data channel pointer 509 indicates the location of the IP data channel.

The third indicator 510 indicates whether there are additional sub data channels similar to the second indicator 508. When the third indicator 510 is '1', a channel pointer exists behind the third indicator 510. In FIG. 5C, the third indicator 510 means that the object data channel exists.

The object data channel pointer 511 indicates the position of the object data channel.

The broadcast service receiving apparatus may know the number of sub data channels using the first indicator 501, the second indicator 508, and the third indicator 510, and the location of each sub data channel using the channel pointer. It can be seen.

6A is a diagram illustrating a structure of an LIT according to an embodiment of the present invention.

The LIT according to an embodiment of the present invention includes a service number field, a version number field, and a service field indicating at least one service.

The service number indicates the number of services included in one transport frame according to the present invention.

The version number indicates the version of the LIT.

Each service field consists of a service identifier field and at least one LMT index number field. The LMT index number field is a number assigned to a channel pointer, as described in the structure of the LIT. Accordingly, the broadcast reception device may interpret the LIT to know the physical address of the sub data channel for the desired service in the transport frame.

For example, in the broadcast service receiving apparatus, the LMT structure of the transmission frame is as shown in FIG. 5B, and the service n of FIG. 6 includes an LMT index number 1 field and an LMT index number 2 field. Assume that a value of 2 and a signaling packet having a value of 5 in the LMT index number 2 field are interpreted. In this case, the broadcast service receiving apparatus is a service n is a service composed of data included in the sub data channel of the physical location indicated by the channel pointer 2 and data included in the sub data channel of the physical location indicated by the channel pointer 5 in FIG. Interpret Therefore, in the broadcast service receiving apparatus, when service n is selected, the transport packet included in the sub data channel of the physical location indicated by the channel pointer 2 and the channel pointer 5 indicated by the channel pointer 2 do not need to process all the transport packets included in the transport frame. By processing only data transmitted through transport packets included in a sub data channel of a physical location, broadcast data can be processed quickly and efficiently.

6B is a diagram illustrating a structure of an LIT according to another embodiment of the present invention.

The LIT according to an embodiment of the present invention includes a service number field, a version number field, and a service field indicating at least one service.

Each service field includes a service identifier field and at least one channel information field.

Hereinafter, it is assumed that the LMT structure of the transmission frame is illustrated in FIG. 5B, and the LMT index numbers are sequentially assigned to the respective sub data channels by dividing the types of the sub data channels. That is, index numbers are independently assigned according to data types. In addition, it is assumed that the service n of FIG. 6 is composed of two sub data channels. Therefore, service n includes a channel information 1 field and a channel information 2 field.

Referring to FIG. 5B, '1' and '2' are assigned as index numbers to 'channel pointer 1' and 'channel pointer 2', which are sub-data channels for IP data, respectively. '1', '2', and '3' are assigned to the channel pointers 3 'to' channel pointer 5 'as index numbers, respectively.

The channel information field is composed of a type information field and an LMT index number field.

The type information field consists of 2 bits and means the type of sub data channel corresponding to the LMT index number. If the value of the type information field is '01', the sub data channel corresponding to the LMT index number is a sub data channel for the IP data. If the value of the type information field is '10', the sub data channel corresponding to the LMT index number is indicated. May mean a sub data channel for an object.

The LMT index number field is composed of '5' bits.

If the value of the channel information 1 field is '0100010', the channel information 1 field indicates a sub data channel having an LMT index number of '2' in the IP virtual sub data channel. Accordingly, it can be seen that the service n is a service composed of data included in the sub data channel of the physical location indicated by the channel pointer 2 in FIG. 5B.

If the value of the channel information 2 field is '1000011', the channel information 2 field indicates a sub data channel having an LMT index number of '3' in the object virtual data channel. Accordingly, it can be seen that the service n is a service composed of data included in the sub data channel of the physical location indicated by the channel pointer 5 in FIG. 5B.

As a result, in the broadcast service receiving apparatus, when service n is selected, the transport packet included in the sub-data channel of the physical location indicated by channel pointer 2 and the channel pointer 5 indicated by channel pointer 2 do not need to process all the transport packets included in the transport frame. By processing only the data transmitted through the transport packet included in the sub data channel of the physical location, it is possible to process broadcast data quickly and efficiently.

7A is a flowchart illustrating a process of interpreting an LMT and an LIT by a broadcast service receiving apparatus. In FIG. 7A, the LMT field is transmitted with a certain period and is located in a certain area of a transmission frame.

When the broadcast service receiving apparatus receives the transport frame, in step S 701, the broadcast receiving apparatus acquires and interprets a signaling packet including service access information located in a predetermined region of the transport frame.

In operation S703, the broadcast service receiving apparatus checks whether an LMT field is present in the signaling packet. If the LMT field does not exist in step S703, in step 705, it is checked whether a previous LMT is stored in the broadcast service receiving apparatus. If there is a previous LMT, the flow proceeds to step S711.

If the LMT field is present in step S703, the broadcast service receiving apparatus checks whether the LMT version is updated in step S707 using the version information included in the LMT field. If the LMT version is updated, the LMT field is interpreted in step S709. In step S 709, when the LMT field is interpreted, position information of each sub data channel is obtained.

In operation S711, the broadcast service receiving apparatus checks whether the LIT field exists. If the LIT field does not exist in step S 711, it is checked in step S 713 whether a previous LIT exists in the broadcast service receiving apparatus. If there is a previous LIT, the flow proceeds to step S719.

In step S 711, if the LIT field is present, the LIT is interpreted in step S 715. If the LIT is interpreted in step S 715, connection information for each service, that is, service configuration information, is obtained.

The service is acquired and processed in step S 719 by using the analysis result of the LMT and the LIT.

7B is another flowchart illustrating a process of interpreting an LMT and an LIT by a broadcast service receiving apparatus. In FIG. 7B, the LMT position and insertion period are variable. In step 7b, the step in which the identification number is the same as step 7a performs the same operation, and thus the description thereof will be omitted.

In operation S720, the LMT in the transmission frame is extracted based on the LMT pointer information extracted from the previous LMT. The LMT pointer information indicates the position of the next LMT. Therefore, even if the LMT is not inserted at a certain position in the frame, the LMT can be easily extracted.

In step S703, it is determined whether the LMT field exists at the position indicated by the LMT pointer information. If the LMT field exists, step S707 is performed. However, if the LMT field does not exist, step S730 is performed. The case where the LMT field does not exist refers to a case in which an error occurs in the LMT field as well as a case where the LMT field is missing.

In operation S720, it is determined whether the previous LMT is valid based on the same version LMT number information included in the previous LMT field. The validity of the previous LMT means that the previous LMT can continue to be used. If the previous LMT is still valid, perform step s711.

In the present specification, the same version LMT number information means the number of LMTs having the same version. For example, the previous LMT is referred to as a first LMT. The same version LMT number information included in the first LMT has the same version as the version of the first LMT and means the number of LMTs to be transmitted (or received) after the first LMT. If the same version LMT number information included in the first LMT is '3', there are '3' LMTs of the same version as the version of the first LMT. Therefore, if the same version LMT number information included in the first LMT is equal to or greater than '1', the packets in the current frame may be processed using the first LMT since the version of the first LMT and the LMT in the current frame are the same.

8 is a block diagram illustrating a configuration of a broadcast service transmitting apparatus according to an embodiment of the present invention.

The broadcast service transmitting apparatus 800 according to an embodiment of the present invention includes a broadcast data packetizer 810, a transport packet generator 820, a transport frame generator 830, and a transmitter 840.

The broadcast data packetizer 810 generates at least one broadcast data packet by packetizing at least one type of broadcast data. The broadcast data includes application data including A / V stream, IP data, object data, etc., which is a kind of real-time media data, and signaling data such as program specific information (PSI), service information (SI), and metadata. For example, application data may be packetized according to the MPEG-4 system standard.

The transport packet generator 820 generates at least one transport packet for transmitting at least one broadcast data packet. The transport packet may have the same size as the MPEG-2 transport stream packet. However, according to an embodiment of the present invention in which the service access information is included in a certain position of the transport frame, it is not necessary to include a packet identifier in the transport packet such as the PID of the MPEG-2 transport stream packet. Also, according to another embodiment of the present invention in which the service access information is not included in a certain position of the transport frame, the service access information does not need to include a separate packet identifier because the service access information includes location information about the next service access information. do.

The transport frame generator 830 generates a transport frame having a predetermined size for transmitting at least one broadcast service configured using the generated at least one transport packet. As illustrated in FIG. 4, the transport frame generator 830 forms at least one transport packet as a sub data channel, and generates a transport frame including the at least one sub data channel.

The transport frame generator 830 generates a transport frame such that service access information for accessing at least one broadcast service transmitted through the transport frame is included in the transport frame. To this end, the transmission frame generator 830 may include a service access information generator 832 for generating service access information.

As described above, the service access information may be transmitted in a certain area of the transport frame, for example, in the first packet in the transport frame. Since the location of the service access information is fixed, the broadcast service receiving apparatus can easily access the service access information in the transport frame. However, the service access information does not have to be included in a certain area in the transmission frame. This is because the service access information includes location information about the next service access information, so that the next service access information can be easily accessed using the previous service access information.

The transmission frame includes at least one virtual channel distinguished according to the type of data. Each of the at least one virtual channel includes at least one sub data channel. The sub data channel corresponds to each of at least one service component constituting a given broadcast service in a transport frame.

The service access information includes an LMT for indicating a position of each sub data channel in a transport frame and an LIT indicating configuration information of at least one broadcast service transmitted through the transport frame.

The LMT includes type information indicating a data type transmitted through a transport frame, version information indicating a version of the LMT, sub data channel number information indicating the number of sub data channels according to each data type, and a location of each sub data channel. Contains channel pointer information indicating. In addition, the LMT is the same version LMT number information indicating the number of LMTs having the same version, LMT pointer information indicating the location of the next LMT, additional data number information indicating the number of additional data for at least one broadcast service and additional data At least one of additional data pointer information indicating each position may be further included.

The LIT includes service number information indicating the number of broadcast services transmitted through a transport frame, version information indicating a version of the LIT, and service information indicating a configuration of a service. The service information includes an index number assigned to channel pointer information indicating a position of each sub data channel included in the LMT. If the index number is sequentially assigned to each sub data channel based on the type of the sub data channel, the service information may include the type information and the index number. In this case, the type information indicates what kind of sub data channel the index number relates to.

The transmitter 840 sequentially transmits a series of transmission frames generated by the transmission frame generator 830 at predetermined intervals. The transmitter 840 may generate an ATSC frame in a form in which at least one transmission frame is inserted and transmit the ATSC frame according to the ATSC system standard.

9 is a flowchart illustrating a broadcast service transmission method according to an embodiment of the present invention.

In operation S 910, the broadcast data packetizer 810 of the broadcast service transmitting apparatus 800 generates at least one broadcast data packet by packetizing at least one type of broadcast data.

In operation S 920, the transport packet generator 820 generates at least one transport packet for transmitting at least one broadcast data packet.

In operation S 930, the transmission frame generation unit 830 generates a transmission frame having a predetermined size for transmitting at least one broadcast service using the generated at least one transmission packet. In step S930 of generating a transport frame, a transport frame is generated such that a transport frame includes service access information for accessing at least one broadcast service delivered through the transport frame.

In operation S 940, transmission frames generated by the transmission unit 840 are transmitted. The transmission frames may be sequentially transmitted at predetermined periods.

10 is a block diagram illustrating a broadcast service receiving apparatus according to an embodiment of the present invention.

The broadcast service receiving apparatus 1000 according to an embodiment of the present invention includes a receiver 1010, a transport frame processor 1020, a transport packet processor 1030, a broadcast data processor 1040, and a user input unit 1050. .

The receiver 1010 receives at least one transmission frame having a predetermined size. The receiver 1010 may be configured to receive an ATSC frame and obtain at least one transmission frame from the ATSC frame.

The transport frame processor 1020 obtains service access information for accessing at least one broadcast service from the transport frame. Then, the transport frame processor 1020 obtains at least one transport packet for transmitting at least one broadcast data packet included in the transport frame by using the service access information. When the service access information is located in a certain area in the frame, the transport frame processing unit 1020 obtains the service access information in a certain area in the received transmission frame. However, if the service access information is not located in a certain area within the frame, the transport frame processing unit 1020 obtains the service access information in the received transport frame based on the location information in the previous service access information. The location information in the service access information is information indicating the location of the next service access information.

In more detail, the transport frame processor 1020 may access the sub data channel according to each service by analyzing the LMT and the LIT as service access information. When one of the services delivered through the transport frame is selected by the transport frame processor 1020, the transport packet included in the sub data channel constituting the selected service is transmitted to the transport packet processor 1030.

The operation of selecting a predetermined service among a plurality of services transmitted through a transmission frame may be performed based on a user input signal input through the user input unit 1050. When the user selects a predetermined service, only transport packets included in the sub data channel constituting the selected service may be delivered to the transport packet processor 1030 for processing. Therefore, it is not necessary to perform a process of filtering all transport packets having a predetermined PID by analyzing all PIDs included in each transport packet.

The transport packet processor 1030 processes at least one transport packet transmitted from the transport frame processor 1030 to obtain at least one broadcast data packet included in the at least one transport packet. The transport packet processor 1030 may further include a header changer (not shown). The header changing unit (not shown) changes the header value of the broadcast data packet having the error to a predetermined value if an error exists in the obtained broadcast data packet. At this time, the header change unit (not shown) may change to a contradictory header value that a header of a general packet cannot have. For example, information indicating that the packet is not the first packet in the frame and information indicating that the packet includes decoding information may be simultaneously included in the header of the packet. The decoding information is transmitted through the first packet in the frame, and the header of the above-described packet is contradictory. According to the present invention described above, the error packet can be discriminated without using the bit used to mean the packet in which the error exists in the prior art, thereby saving the data transmission amount.

The broadcast data processor 1040 processes at least one broadcast data packet. The broadcast data processor 1040 may be configured as a decoder for processing broadcast data encoded according to the MPEG-4 system standard.

11 is a flowchart illustrating a broadcast service receiving method according to an embodiment of the present invention.

In step S 1110, a transmission frame having a certain size is received.

In operation S 1120, access information for accessing at least one broadcast service is obtained from a transport frame, and at least one transport packet constituting a predetermined broadcast service included in the transport frame is obtained using the access information.

In operation S 1130, the at least one transport packet is processed to obtain at least one broadcast data packet included in the at least one transport packet.

In step S 1140, the at least one broadcast data packet is processed.

The present invention can be embodied as computer readable code on a computer readable recording medium. Codes and code segments implementing the above program can be easily deduced by computer programmers in the art. Computer-readable recording media include all kinds of recording devices that store data that can be read by a computer system. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical disk and flash memory. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

The above description is only one embodiment of the present invention, and those skilled in the art may implement the present invention in a modified form without departing from the essential characteristics of the present invention. Therefore, the scope of the present invention should not be limited to the above-described examples, but should be construed to include various embodiments within the scope equivalent to those described in the claims.

1 is a diagram illustrating a process of processing a transport stream generated using a packet identifier.

2 illustrates an example of a transport stream generated using a packet identifier.

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

4 is a view showing in detail the structure of the transmission frame of FIG.

5A and 5B illustrate a structure of an LMT according to an embodiment of the present invention.

5C illustrates the structure of an LMT 500 according to another embodiment of the present invention.

6A illustrates a structure of an LIT according to an embodiment of the present invention.

6B illustrates the structure of an LIT according to another embodiment of the present invention.

7A is a flowchart illustrating a process of interpreting LMT and LIT.

7b is another flowchart illustrating a process of interpreting LMT and LIT.

8 is a block diagram showing a configuration of a broadcast service transmitting apparatus according to an embodiment of the present invention.

9 is a flowchart illustrating a broadcast service transmission method according to an embodiment of the present invention.

10 is a block diagram illustrating a broadcast service receiving apparatus according to an embodiment of the present invention.

11 is a flowchart illustrating a broadcast service receiving method according to an embodiment of the present invention.

Claims (46)

A broadcast data packetizer configured to generate at least one broadcast data packet by packetizing at least one type of broadcast data; A transport packet generator configured to generate at least one transport packet for transmitting the at least one broadcast data packet; A transmission frame generation unit generating a transmission frame having a predetermined size for transmitting at least one broadcast service configured using the generated at least one transport packet; And A transmission unit for transmitting the transmission frame, And the transport frame generation unit generates the transport frame such that service access information for accessing at least one broadcast service transmitted through the transport frame is included in the transport frame. The method of claim 1, And the service access information is located in a predetermined area within the transport frame. The method of claim 1, And the service access information includes location information about next service access information. The method of claim 1, The transmission frame includes at least one virtual data channel distinguished according to the type of data, And wherein each of the at least one virtual data channel comprises at least one sub data channel consisting of the at least one transport packet. The method of claim 1, The service access information is LMT for indicating a physical location for a sub data channel corresponding to a service component constituting at least one broadcast service in the transport frame and configuration information of at least one broadcast service transmitted through the transport frame. Broadcast service transmission apparatus comprising a LIT indicating. The method of claim 5, The LMT includes type information indicating a configuration of a data type transmitted through the transmission frame, version information indicating a version of the LMT, sub data channel number information indicating a number of sub data channels according to each data type, and the respective information. And channel pointer information indicating a position of a sub data channel of the apparatus. The method of claim 6, wherein the LMT, Same version LMT number information indicating the number of LMTs having the same version as the version of the LMT, LMT pointer information indicating the location of the next LMT, additional data number information indicating the number of additional data regarding the at least one broadcast service, and the And at least one of additional data pointer information indicating a location of each of the additional data. The method of claim 5, The LIT includes service number information indicating the number of broadcast services transmitted through the transport frame, version information indicating a version of the LIT, and service information indicating a configuration of the broadcast service. The method of claim 8, And the service information includes an LMT index number assigned to channel pointer information indicating a position of each sub data channel included in the LMT. The method of claim 1, And the transmitting unit generates and transmits an ATSC frame generated by inserting at least one of the transmission frames. Packetizing at least one type of broadcast data to generate at least one broadcast data packet; Generating at least one transport packet for transmitting the at least one broadcast data packet; Generating a transport frame having a predetermined size for transmitting at least one broadcast service configured using the generated at least one transport packet; And Transmitting the transmission frame; In the generating of the transport frame, the transport frame is a broadcast service transmission method, characterized in that the transport frame is generated to include the service access information for accessing at least one broadcast service delivered through the transport frame. The method of claim 11, The service access information is a broadcast service transmission method, characterized in that located in a certain area within the transport frame. The method of claim 11, The service access information is broadcast service transmission method characterized in that it includes location information about the next service access information. The method of claim 11, The transmission frame includes at least one virtual data channel distinguished according to the type of data, Each of the at least one virtual data channel comprises at least one sub data channel consisting of the at least one transport packet. The method of claim 11, The service access information indicates an LMT for indicating a location of a sub data channel corresponding to a service component constituting at least one broadcast service in the transport frame and configuration information of at least one broadcast service transmitted through the transport frame. Broadcasting service transmission method comprising a LIT. The method of claim 15, The LMT includes type information indicating a configuration of a data type transmitted through the transmission frame, version information indicating a version of the LMT, sub data channel number information indicating a number of sub data channels according to each data type, and And a channel pointer information indicating a position of each sub data channel. The method of claim 16, wherein the LMT, Same version LMT number information indicating the number of LMTs having the same version as the version of the LMT, LMT pointer information indicating the location of the next LMT, additional data number information indicating the number of additional data regarding the at least one broadcast service, and the And at least one of additional data pointer information indicating a location of each of the additional data. The method of claim 15, The LIT includes service number information indicating the number of broadcast services transmitted through the transport frame, version information indicating a version of the LIT, and service information indicating a configuration of the broadcast service. The method of claim 18, And the service information includes an index number assigned to channel pointer information indicating a position of each sub data channel included in the LMT. The method of claim 11, And generating and transmitting the ATSC frame in which the transmission frame is inserted into at least one inserted frame. Receiving unit for receiving a transmission frame having a predetermined size; A service for obtaining service access information for accessing at least one broadcast service from the transport frame, and for obtaining at least one transport packet constituting a predetermined broadcast service delivered through the transport frame using the service access information A frame processor; A transport packet processing unit processing the at least one transport packet to obtain at least one broadcast data packet included in the at least one transport packet; And And a broadcast data processing unit for processing the at least one broadcast data packet. The method of claim 21, And the service access information is located in a predetermined area within the transport frame. The method of claim 21, The service access information, Including location information about the following service access information, The transmission frame processing unit, And obtaining the service access information from the transport frame based on the location information in the previous service access information. The method of claim 21, The service access information, It includes information about the number of service access information having the same content as the service access information, The transmission frame processing unit, And a service access information restoration unit for restoring the obtained service access information based on previous service access information when an error exists in the obtained access information. The method of claim 21, The transmission frame includes at least one virtual data channel distinguished according to the type of data, Each of the at least one virtual data channel comprises at least one sub data channel consisting of the at least one transport packet. The method of claim 21, The service access information indicates an LMT for indicating a location of a sub data channel corresponding to a service component constituting at least one broadcast service in the transport frame and configuration information of at least one broadcast service transmitted through the transport frame. Broadcast service receiving apparatus comprising a LIT. The method of claim 26, The LMT includes type information indicating a configuration of a data type transmitted through the transmission frame, version information indicating a version of the LMT, sub data channel number information indicating a number of sub data channels according to each data type, and And a channel pointer information indicating a position of each sub data channel. The method of claim 27, wherein the LMT, Same version LMT number information indicating the number of LMTs having the same version as the version of the LMT, LMT pointer information indicating the location of the next LMT, additional data number information indicating the number of additional data regarding the at least one broadcast service, and the And at least one of additional data pointer information indicating a location of each of the additional data. The method of claim 26, The LIT includes service number information indicating the number of broadcast services transmitted through the transport frame, version information indicating a version of the LIT, and service information indicating a configuration of the service. The method of claim 29, And the service information includes an index number assigned to channel pointer information indicating a position of each sub data channel included in the LMT. The method of claim 21, And the receiving unit obtains at least one transmission frame from the ATSC frame by receiving an ATSC frame. The method of claim 21, The transport packet processing unit, A header change unit for changing a header value of the broadcast data packet in which the error exists to a predetermined value if an error exists in the obtained broadcast data packet, The broadcast data processing unit And skipping the broadcast data packet having the predetermined header value among the at least one broadcast data packet without processing the broadcast data packet. Receiving a transmission frame having a predetermined size; Obtaining service access information for accessing at least one broadcast service from the transport frame, and obtaining at least one transport packet constituting a predetermined broadcast service delivered through the transport frame using the service access information; ; Processing the at least one transport packet to obtain at least one broadcast data packet included in the at least one transport packet; And And processing the at least one broadcast data packet. The method of claim 33, wherein And the service access information is located in a predetermined area within the transport frame. The method of claim 33, wherein The service access information, Including location information about the following service access information, Acquiring the transport packet, And obtaining the service access information from the transport frame based on location information in previous service access information. The method of claim 33, wherein The service access information, Includes information on the number of service access information having the same content as the access information, Acquiring the transport packet, And if the error exists in the obtained service access information, restoring the obtained service access information based on previous service access information. The method of claim 33, wherein The transmission frame includes at least one virtual data channel distinguished according to the type of data, Each of the at least one virtual data channel comprises at least one sub data channel consisting of the at least one transport packet. The method of claim 33, wherein The service access information indicates an LMT for indicating a location of a sub data channel corresponding to a service component constituting at least one broadcast service in the transport frame and configuration information of at least one broadcast service transmitted through the transport frame. Broadcast service reception method comprising a LIT. The method of claim 38, The LMT includes type information indicating a configuration of a data type transmitted through the transmission frame, version information indicating a version of the LMT, sub data channel number information indicating a number of sub data channels according to each data type, and And a channel pointer information indicating a position of each sub data channel. The method of claim 39, wherein the LMT, Same version LMT number information indicating the number of LMTs having the same version as the version of the LMT, LMT pointer information indicating the location of the next LMT, additional data number information indicating the number of additional data regarding the at least one broadcast service, and the And at least one of additional data pointer information indicating a location of each of the additional data. The method of claim 38, The LIT includes service number information indicating the number of broadcast services transmitted through the transport frame, version information indicating a version of the LIT, and service information indicating a configuration of the service. The method of claim 41, wherein And the service information includes an index number allocated to channel pointer information indicating a position of each sub data channel included in the LMT. The method of claim 33, wherein receiving the transmission frame, And receiving at least one ATSC frame to obtain at least one transmission frame from the ATSC frame. The method of claim 33, wherein Acquiring the broadcast data packet, Changing a header value of the broadcast data packet having the error to a predetermined value if an error exists in the obtained broadcast data packet; The processing of the broadcast data packet may include: The broadcast service receiving method of claim 1, wherein the broadcast data packet having the predetermined header value among the at least one broadcast data packet is skipped without being processed. A computer-readable recording medium having recorded thereon a program for implementing a broadcast service transmission method, the method comprising: Packetizing at least one type of broadcast data to generate at least one broadcast data packet; Generating at least one transport packet for transmitting the at least one broadcast data packet; Generating a transport frame having a predetermined size for transmitting at least one broadcast service configured using the generated at least one transport packet; Transmitting the transmission frame; In the generating of the transmission frame, the transmission frame is generated so that the transmission frame includes service access information for accessing at least one broadcast service transmitted through the transmission frame. A computer-readable recording medium having recorded thereon a program for implementing a broadcast service receiving method, the method comprising: Receiving a transmission frame having a predetermined size; Obtaining service access information for accessing at least one broadcast service from the transport frame, and obtaining at least one transport packet constituting a predetermined broadcast service delivered through the transport frame using the service access information; ; Processing the at least one transport packet to obtain at least one broadcast data packet included in the at least one transport packet; And And processing the at least one broadcast data packet.

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