JP7243799B2 - Receiving method and receiving device - Google Patents

Description

The technology disclosed in this specification includes a transmission device and a transmission method for transmitting a data broadcasting application and its control information according to a predetermined transport method, and a data broadcasting application transmitted according to a predetermined transport method and its control information. The present invention relates to a receiving device and a receiving method for receiving and executing a data broadcasting application based on control information.

In current broadcasting systems, the MPEG-2 TS (Moving Picture Experts Group-2 Transport Stream) method and the RTP (Real Time Protocol) method are widely used as media transport methods (see, for example, Patent Document 1). ). As a next-generation digital broadcasting system, MMT (MPEG Media Transport) standardized as a new media transport system in MPEG (see, for example, Non-Patent Document 1) will be considered for ultra-high-definition TV broadcasting standards. It is The MMT system can be easily used in combination with different transmission lines, and can be used in common for a plurality of transmission lines for broadcasting and communication.

At the time of the filing of this application, a super-high definition TV broadcast standard based on the MMT system is under consideration. In addition, stream media of broadcast programs such as video, audio, subtitles, etc. are transmitted in the Timed MPU (Media Processing Unit) format, while data broadcasting applications such as HTML (Hyper Text Markup Language) documents and applications are transmitted. A method of transmitting related control information in a non-timed MPU format is also defined.

In data broadcasting services, it is assumed that key stations, which are the producers of broadcast programs, mainly provide applications linked to broadcast programs, while local stations, which are distributors, also provide their own applications. . Although each local station does not necessarily link to the broadcast program itself, it provides its own application with information closely related to the region, such as weather forecasts and local news. There is

In the current data broadcasting using BML (Broadcast Markup Language) and the operation of hybridcast broadcasting stations, especially in private broadcasting, from the viewpoint of not increasing the burden on distribution facilities of local stations and demarcation of responsibility, application transmission and Application-related control information is also considered to be distributed independently for key stations and local stations.

When considering next-generation broadcasting standards, we should fully consider the demands of commercial broadcasters to provide their own applications to local stations. Here, if all data broadcasting services are integrated into one system, each local station must add or replace its own application for the data flow of data broadcasting prepared by the key station. not. This results in exorbitant delivery costs for local stations and the risk of poor performance.

JP 2013-153291 A

ISO/IEC FDIS 23008-1:2013(E) Information technology--High efficiency coding and media delivery in heterogeneous environments--Part 1: MPEG media transport (MMT)

An object of the technology disclosed in this specification is to provide an excellent transmission device and transmission method that can suitably transmit a data broadcasting application and its control information using a predetermined transport method.

Another object of the technology disclosed in this specification is to suitably receive a data broadcasting application and its control information transmitted by a predetermined transport method, and execute the data broadcasting application based on the control information. To provide an excellent receiving device and receiving method.

The present application was made in consideration of the above problems, and the technology described in claim 1 is
a control information generator that generates control information related to an application for a broadcast program;
a transmission unit that transmits the control information generated by the control information generation unit;
and
The control information generation unit groups the control information for each group in which the application should be operated independently, and stores the acquisition destination information of the control information for each group in an application service descriptor arranged in a predetermined signaling table. and indicating the group identification,
It is a transmitter.

According to the technique described in claim 2 of the present application, the control information generation unit of the transmission device described in claim 1 stores the application information in a signaling table transmitted by a signaling message as an entry point of signaling information. A service descriptor is arranged to indicate acquisition source information and group identification information of the control information for each group.

According to the technology described in claim 3 of the present application, the control information generation unit of the transmission device described in claim 1 stores, in the application service descriptor, control necessary or important for operation of the application for each group. It is configured to indicate acquisition source information and group identification information of a signaling message or signaling table storing data.

According to the technique described in claim 4 of the present application, the control information generation unit of the transmission device according to claim 1 includes, in the application service descriptor, a data transmission message for each group, MH-AIT, It is configured to indicate EMT acquisition source information and group identification information.

According to the technique described in claim 5 of the present application, the control information generation unit of the transmission device described in claim 1 indicates in the application service descriptor that an application is set as a default entry. Configured to further indicate a default flag.

According to the technology described in claim 6 of the present application, the control information generation unit of the transmission device described in claim 1 further adds an organization identifier for identifying an organization to which each group belongs to the application service descriptor. configured as shown.

According to the technique recited in claim 7 of the present application, the control information generating unit of the transmission device recited in claim 1 further indicates information indicating a variation of an application format in the application service descriptor. It is configured.

According to the technique recited in claim 8 of the present application, the control information generation unit of the transmission device recited in claim 1 indicates variations of an application and a transmission method of control information of the application in the application service descriptor. It is configured to show more information.

According to the technique recited in claim 9 of the present application, the transmission apparatus recited in claim 1 includes an AV encoder that encodes broadcast program main body data, and a file encoder that encodes application file data for the broadcast program. It also has an encoder. The transmission unit is configured to multiplex the control information with encoded data encoded by the AV encoder and the file encoder, respectively, and transmit the multiplexed data.

In addition, the technology according to claim 10 of the present application is
a control information generating step for generating control information related to an application to a broadcast program;
a transmission step of transmitting the control information generated in the control information generation step;
has
In the control information generation step, the control information is grouped for each group in which the application should be operated independently, and the acquisition destination information of the control information for each group is stored in an application service descriptor arranged in a predetermined signaling table. and indicating the group identification,
transmission method.

Further, the technology according to claim 11 of the present application is
a control information receiver that receives control information related to an application for a broadcast program;
an application data control unit that controls execution of an application based on the control information received by the control information reception unit;
and
The application data control unit, based on the acquisition source information and group identification information of the control information for each group in which the application is to be operated independently, indicated by the application service descriptor arranged in the predetermined signaling table, get the application data transmitted from each group,
It is a receiving device.

According to the technique recited in claim 12 of the present application, the application data control unit of the receiving apparatus recited in claim 11 is arranged in a signaling table transmitted by a signaling message that is an entry point of signaling information. Acquisition source information and group identification information of the control information for each group are obtained from the application service descriptor.

According to the technique recited in claim 13 of the present application, the application data control unit of the receiving device recited in claim 11, from the application service descriptor, performs necessary or important operations for the application for each group. It is configured to obtain source information and group identification information of a signaling message or signaling table storing control data.

According to the technique recited in claim 14 of the present application, the application data control unit of the receiving device recited in claim 11, from the application service descriptor, the data transmission message for each group, MH- It is configured to acquire AIT and EMT acquisition source information and group identification information.

According to the technique recited in claim 15 of the present application, the application data control unit of the receiving device recited in claim 11 is configured to set the application for which the default flag is set in the application service descriptor as a default entry. configured to start as

According to the technique recited in claim 16 of the present application, the application data control unit of the receiving apparatus recited in claim 11 determines whether a group belongs based on the organization identifier indicated in the application service descriptor. It is configured to identify the organization responsible for

According to the technique recited in claim 17 of the present application, the application data control unit of the receiving apparatus recited in claim 11 determines the application transmitted by each group based on the information indicated by the application service descriptor. It is configured to identify the format.

According to the technique described in claim 18 of the present application, the application data control unit of the receiving device described in claim 11 can transmit the application indicated by the application service descriptor and the variation of the transmission method of the application control information. Based on the information shown, it is configured to acquire the application transmitted by each group and the control information of the application.

According to the technology recited in claim 19 of the present application, the receiving device recited in claim 11 includes an AV decoder that decodes data of the main body of the broadcast program, and a synthesizing unit that synthesizes the decoded broadcast program and the result of executing the application. is further provided.

In addition, the technology according to claim 20 of the present application is
a control information receiving step of receiving control information related to an application to a broadcast program;
an application data control step of controlling execution of an application based on the control information received in the control information receiving step;
has
In the application data control step, based on the acquisition source information and group identification information of control information for each group in which the application is to be independently operated, indicated by the application service descriptor arranged in the predetermined signaling table, get the application data to run,
reception method.

According to the technology disclosed in this specification, it is possible to provide an excellent transmission device and transmission method that can suitably transmit a data broadcasting application and its control information using a predetermined transport method.

Further, according to the technology disclosed in this specification, it is possible to suitably receive a data broadcasting application and its control information transmitted by a predetermined transport method, and execute the data broadcasting application based on the control information. An excellent receiving device and receiving method can be provided.

According to the technology disclosed in this specification, a plurality of groups such as a key station as a program production station, each local station as a distribution station, and a third party can perform data broadcasting applications and applications for each group for the same broadcast program. can be distributed through independent systems. Therefore, there is no need to increase the demarcation of responsibility between the key station and the local stations and the load on the distribution facilities of the local stations.

Note that the effects described in this specification are merely examples, and the effects of the present invention are not limited to these. Moreover, the present invention may have additional effects in addition to the effects described above.

Still other objects, features, and advantages of the technology disclosed in this specification will become apparent from more detailed description based on the embodiments described later and the accompanying drawings.

FIG. 1 is a diagram schematically showing a configuration example of a digital broadcasting system 10 to which the technique disclosed in this specification is applied. FIG. 2 shows a stack model 200 of a broadcast signal applying MMT. FIG. 3 is a diagram showing a configuration example of the broadcast transmission system 11 that transmits the broadcast signal shown in FIG. FIG. 4 is a diagram showing a configuration example of the receiver 12 that receives the broadcast signal shown in FIG. FIG. 5 is a diagram showing an image of a broadcast signal (package) 500 transmitted from the broadcast transmission system 11 to the RF transmission line according to the MMT system. FIG. 6 is a diagram showing a mechanism for designating each asset of the package from the MP table within the PA message. FIG. 7 is a diagram for explaining a mechanism for acquiring files constituting a data broadcasting application to be MMT-transmitted. FIG. 8 is a diagram showing an example of link relationships between data broadcasting applications produced by a program production station, a distribution station, and a third party. FIG. 9 is a diagram showing a configuration example of a signal for distributing a data broadcasting application for each group and its control information through an independent system. FIG. 10 is a diagram showing a modification of the multiple-system distribution signal shown in FIG. FIG. 11 is a diagram showing a link relationship between applications operated by each group during the time period during which program #2 in FIG. 10 is broadcast. FIG. 12 is a diagram showing a link relationship between applications operated by each group during the time period during which program #3 in FIG. 10 is broadcast. FIG. 13 is a diagram schematically showing an application distribution system system. FIG. 14 is a diagram showing a configuration example of a PA message 1401, which is one of signaling messages, and an MP table 1402 included in the PA message. FIG. 15 is a diagram showing an example data structure of the PA message 1500. As shown in FIG. FIG. 16 is a diagram showing an explanation of parameters included in the PA message. FIG. 17 is a diagram showing an example data structure of the MP table 1700. As shown in FIG. FIG. 18 is a diagram showing an explanation of parameters included in the MP table. FIG. 19 is a diagram showing an example data structure of an application service descriptor. FIG. 20 is a diagram showing an example data structure of MMT_general_location_info.

Hereinafter, embodiments of the technology disclosed in this specification will be described in detail with reference to the drawings.

FIG. 1 schematically shows a configuration example of a digital broadcasting system 10 to which the technique disclosed in this specification is applied. The illustrated digital broadcasting system 10 comprises a broadcasting transmission system 11 and a receiver 12 . In the digital broadcasting system 10 shown in FIG. 1, it is assumed that MMT is applied as a transport system for transmitting broadcast signals from the broadcast transmission system 11 to the receiver 12 .

The broadcast transmission system 11 transmits IP (Internet Protocol) broadcast signals including transmission media. Broadcast signal transmission media include both timed media and non-timed media such as files. Timed media is, for example, stream data related to broadcast programs such as video, audio, subtitles, and the like. Non-timed media are file data used for data broadcasting, such as HTML documents. Both timed and non-timed data are transmitted in MPU format.

In this embodiment, the broadcast transmission system 11 is composed of a key station (program production station) that produces the main body of the program and each local station (distribution station) that is a distributor for each region. The key station multiplexes and transmits data broadcasting applications mainly linked to the broadcast program into the produced broadcast program body. Also, each local station multiplexes its own data broadcasting application with the main body of the broadcast program provided by the key station and sends it out. Each local station's own data broadcasting application does not necessarily link to the broadcast program itself, but provides information closely related to the area, such as weather forecasts and local news.

On the other hand, the receiver 12 receives broadcast signals sent from the broadcast transmission system 11 . The receiver 12 acquires transmission media such as video, audio, subtitles, etc. from the received broadcast signal, and presents images and sounds. When the receiver 12 acquires each file and data for data broadcasting from the received broadcast signal, the receiver 12 activates an application engine such as an HTML browser to present data broadcasting linked to the broadcast program.

FIG. 2 shows a stack model 200 of an example broadcast signal configuration when MMT is applied as a transport method.

At the lowest layer of stack model 200 is physical layer (PHY) 201 . The physical example 201 includes modulation schemes, error correction schemes, and the like.

Above the physical layer 201 is a layer 202 of transmission packets of TLV (Type Length Value). An IP packet 203 is placed on the TLV 202, and a UDP (User Datagram Protocol) 204 is placed thereon. In addition, on the TLV transmission packet 202, a header compression IP 205 obtained by compressing the IP 203 and UDP 204 headers and a transmission control signal 206 as signaling information (SI) are also placed.

An MMT packet 207, an NTP (Network Time Protocol) packet 208 containing current time information, and the like are placed on the UDP 204. FIG. The MMT Protocol (MMTP) is an application layer transport protocol for transmitting MMTP payloads 209 over IP networks.

The MMT payload 209 of the MMT packet 207 includes an MFU (MMT Fragment Unit) 210 or a signaling message 211 related to data broadcasting. MFU 210 is a fragment of an MPU that is a container for encoded timed and non-timed media. Stream data (timed media) 212 such as video, audio, and subtitles, and file data (non-timed media) 213 such as HTML document data are inserted into the MFU 210 .

FIG. 3 shows a configuration example of the broadcast transmission system 11 that transmits the broadcast signal shown in FIG. The broadcast transmission system 11 corresponds to a key station (program production station) that is the producer of the main body of the broadcast program, or each local station (distribution station) that is a distributor. The illustrated broadcast transmission system 11 includes a clock unit 301, a signal transmission unit 302, a video encoder 303, an audio encoder 304, a caption encoder 305, a signaling encoder 306, a file encoder 307, and information It comprises a system 308 , a TLV signaling encoder 309 , an IP service multiplexer (MUX) 310 , a TLV multiplexer (MUX) 311 and a modulation and transmission unit 312 .

The clock unit 301 generates time information synchronized with time information obtained from an NTP server (not shown), and sends IP packets containing this time information to the IP service multiplexer 310 .

The signal transmission unit 302 is, for example, a recording/reproducing device such as a studio of a TV broadcasting station or a VTR. Send data (such as HTML document data) to video encoder 303, audio encoder 304, caption encoder 305, and file encoder 307, respectively.

The information system 308 is a scheduler of the TV broadcasting station and a file supply source, and sends data broadcasting applications, which are non-timed media, and control information related to the data broadcasting applications to the file encoder 307 and signaling encoder 306, respectively. If the broadcast transmission system 11 is a program production station such as a key station, the information system 308 mainly transmits data broadcast applications linked to broadcast programs and related control information to the file encoder 307 and signaling encoder 306, respectively. do. In addition, in the case of a distribution station such as a local station, the information system 308 stores its own data broadcasting application including information closely related to each region (not necessarily linked to the broadcast program) and control information related thereto, It is sent to the file encoder 307 and signaling encoder 306 .

The video encoder 303 encodes the video signal sent from the signal sending unit 302 , packetizes it, and sends IP packets including video MMT packets to the IP service multiplexer 310 . The audio encoder 304 also encodes the audio signal sent from the signal sending unit 302 , further packetizes it, and sends IP packets including audio MMT packets to the IP service multiplexer 310 . The caption encoder 305 also encodes the caption signal sent from the signal sending unit 302 , packetizes it, and sends IP packets including caption MMT packets to the IP service multiplexer 310 .

The signaling encoder 306 generates a signaling message describing control information related to the data broadcasting application based on information sent from the information system 308, and includes an MMT packet in which the signaling message is placed in the payload section. Send the IP packet to IP service multiplexer 310 . In this embodiment, signaling messages are roughly classified into three types: PA (Package Access) messages, M2 section messages, and data transmission messages. Details of each signaling message will be given later.

The file encoder 307 divides the file data sent from the signal sending unit 302 or the information system 308 as necessary, generates MMT packets containing the file data, and converts IP packets containing the MMT packets. Send to IP service multiplexer 310 . Note that the file data constitutes a data broadcasting application.

The broadcast transmission system 11 is equipped with an IP service multiplexer 310 for each channel (broadcast program) to be transmitted. One-channel IP service multiplexer 310 multiplexes IP packets containing video, audio, subtitles, signaling messages, and file data sent from each encoder 303-307 into one Generate the TLV packets that make up the channel.

The TLV signaling encoder 309 encodes signaling information sent from the information system 308 to generate TLV packets to be placed in the payload section.

The TLV multiplexer 311 multiplexes the TLV packets generated by each IP service multiplexer 310-1 to 310-N and the TLV signaling encoder 309 to generate a broadcast stream.

However, when the broadcast transmission system 11 is a distribution station, the signal transmission unit 302, the video encoder 303, the audio encoder 304, and the caption encoder 305 are not equipped, and the broadcast is transmitted from the program production station via a B2B communication channel or the like. A broadcast stream is received and this is multiplexed by the TLV multiplexer 311 .

The modulation/transmission unit 312 performs RF modulation processing on the broadcast stream generated by the TLV multiplexer 311 and sends the result to the RF transmission line. However, if the broadcast transmission system 11 is a program production station, the modulation/transmission unit 312 transmits the broadcast stream to each distribution station such as a local station via a B2B communication channel or the like.

The operation of the broadcast transmission system 11 shown in FIG. 3 will be described.

The clock unit 301 generates time information synchronized with the time information obtained from the NTP server, and generates IP packets containing this time information.

A video signal sent from the signal sending unit 302 is supplied to the video encoder 303 . At the video encoder 303, the video signal is encoded and further packetized to generate IP packets containing MMT packets of the video. This IP packet is sent to IP service multiplexer 310 .

Similar processing is also performed on the audio signal and caption signal sent from the signal sending section 302 . Then, the IP packets including the audio MMT packets generated by the audio encoder 304 are sent to the IP service multiplexer 310, and the IP packets including the caption MMT packets generated by the caption encoder 305 are sent to the IP service. • sent to the multiplexer 310;

Further, in signaling encoder 306, a signaling message related to data broadcasting is generated based on information sent from information system 308, and an IP packet including an MMT packet in which the signaling message is arranged in the payload portion is generated. be. This IP packet is sent to IP service multiplexer 310 .

File data sent from the signal sending unit 302 or the information system 308 is supplied to the file encoder 307 . The file encoder 307 divides the file data as necessary, generates MMT packets containing the file data, and generates IP packets containing these MMT packets. This IP packet is sent to IP service multiplexer 310 .

Each IP service multiplexer 310 multiplexes IP packets including video, audio, subtitles, signaling messages, and file data sent from each encoder 303-307 to form one channel. A TLV packet is generated to

The TLV signaling encoder 309 encodes the signaling information sent from the information system 308 to generate TLV packets to be placed in the payload section.

The TLV multiplexer 311 multiplexes the TLV packets generated by the IP service multiplexers 310-1 to 310-N and the TLV signaling encoder 309 to generate a broadcast stream. The modulation/transmission unit 312 performs RF modulation processing on the broadcast stream generated by the TLV multiplexer 311, and outputs the RF modulated signal to the RF transmission line.

FIG. 4 shows a configuration example of the receiver 12 that receives the broadcast signal shown in FIG. The illustrated receiver 12 includes a tuner/demodulator 401, a demultiplexer (DEMUX) 402, a clock 403, a video decoder 404, an audio decoder 405, a caption decoder 406, and an application data control unit. It comprises a unit 407 , a cache memory 408 , a data broadcasting application engine 409 , a system control unit 410 , a synthesizing unit 411 and an IP interface 412 .

A tuner/demodulator 401 receives the RF modulated signal and performs demodulation processing to obtain a broadcast stream. The demultiplexer 402 performs demultiplexing and packetization processing on this broadcast stream to obtain NTP time information, signaling information, video, audio and caption coded signals related to the main part of the broadcast program, It outputs file data (HTML documents, etc.) for data broadcasting applications linked to broadcast programs, and signaling messages containing control information related to data broadcasting applications. The file data used for data broadcasting is, for example, a data broadcasting application described in HTML5 format.

A video decoder 404 decodes the encoded video signal obtained by the demultiplexer 402 to obtain a baseband video signal. Also, the audio decoder 405 decodes the encoded audio signal obtained by the demultiplexer 402 to obtain a baseband audio signal. Also, the caption decoder 406 decodes the encoded caption signal obtained by the demultiplexer 402 to obtain a caption display signal.

The application data control unit 407 processes each file data for the data broadcasting application. In this embodiment, it is assumed that files and data for data broadcasting applications are transmitted from two systems: a broadcast signal and an IP network. 412, the application data control unit 407 acquires them. The application data control unit 407 controls the processing of the acquired file data based on the control information written in the signaling message output from the demultiplexer 402. FIG. For example, when the application data control unit 407 analyzes the signaling message and finds the data broadcasting application set as the default entry, the corresponding file data (HTML document, etc.) is processed by an HTML browser or the like. The data broadcasting application engine 409 is instructed. Also, the application data control unit 407 controls pre-caching and forced caching of the file data received by the broadcast signal to the cache 408 based on the signaling message. For details of file data cache processing based on signaling messages, see, for example, Japanese Patent Application No. 2014-116283 already assigned to the present applicant.

In the broadcast stream, file data for the data broadcast application related to the program being broadcast is repeatedly sent. The system control unit 410 controls the filtering operation in the demultiplexer 402, and the application data control unit 407 acquires only the necessary data in the demultiplexer 402 from the file data group repeatedly sent. make it

The system control unit 410 controls the operation of each unit of the receiver 12 based on the signaling information obtained by the demultiplexer 402, the operation information from the user via the user operation unit (not shown), and the like. Based on the NTP time information obtained by the demultiplexer 402, the clock unit 403 generates time information synchronized with this time information.

Also, the system control unit 410 controls the decoding timings of the decoders 404 to 406 based on the signaling information, and adjusts the presentation timings of the video, audio and subtitles. The synthesizing unit 411 synthesizes the caption display signal and the data broadcasting display signal with the baseband video signal to obtain a video signal for image display. Also, the baseband audio signal obtained by the audio decoder 405 becomes an audio output audio signal. A main broadcast program consisting of a video signal and an audio signal is output as video and audio from a monitor display (not shown). The data broadcast processed by the data broadcast application engine 409 is also superimposed on the screen of the main part of the broadcast program and displayed on the monitor display.

The operation of the receiver 12 shown in FIG. 4 will be described.

The tuner/demodulator 401 receives the RF modulated signal, demodulates it, and obtains a broadcast stream. In the demultiplexer 402, this broadcast stream is demultiplexed and packetized, and the NTP time information, signaling message, video, audio, caption coded signals, and file data are processed. is extracted.

The NTP time information extracted by demultiplexer 402 is sent to clock section 403 . Based on the NTP time information, the clock unit 403 generates time information synchronized with this time information. That is, the clock unit 403 generates time information matching the time information generated by the clock unit 301 on the broadcast transmission system 11 side.

The encoded video signal extracted by the demultiplexer 402 is sent to the video decoder 404 and decoded to obtain a baseband video signal. Also, the encoded caption signal extracted by the demultiplexer 402 is sent to the caption decoder 406 and decoded to obtain a caption display signal. Also, the file data extracted by the demultiplexer 402 is sent to the data broadcasting application engine 407 and processed to obtain a data broadcasting display signal. Note that the system control unit 410 controls the filtering operation in the demultiplexer 402 so that the demultiplexer 402 acquires only necessary file data.

Then, the synthesizing unit 411 synthesizes the caption display signal and the data broadcast display signal with the baseband video signal to obtain a video signal for image display.

The encoded audio signal extracted by the demultiplexer 402 is sent to the audio decoder 405 and decoded to obtain a baseband audio signal for audio output. A main broadcast program consisting of a video signal and an audio signal is output as video and audio from a monitor display (not shown).

On the other hand, the application data control unit 407 refers to the signaling table included in the signaling message and sends the data broadcasting application file data ( HTML document, etc.). For example, when the application data control unit 407 analyzes the signaling message and finds the data broadcasting application set as the default entry, the corresponding file data (HTML document, etc.) is processed by an HTML browser or the like. The data broadcasting application engine 409 is instructed.

The data broadcasting application engine 409 processes the data broadcasting application using the file data cached in the cache memory 408 as appropriate. The data broadcast processed by the data broadcast application engine 409 is also superimposed on the screen of the main part of the broadcast program and displayed on the monitor display.

In the digital broadcasting system 10 shown in FIG. 1, it is assumed that MMT is applied as a transport system for transmitting broadcast signals from the broadcast transmission system 11 to the receiver 12 . FIG. 5 shows an image of a broadcast signal 500 transmitted from the broadcast transmission system 11 to the RF transmission line according to the MMT system.

Broadcast signals of one service (channel: broadcast program) consist of timed media related to the main part of the broadcast program such as video, audio, subtitles, etc., and non-timed media such as file data used for data broadcasting linked to the broadcast program. It consists of media, and transmits media data in which these are encoded in the MPU format. In addition, information on transmission control of these broadcast signals is transmitted by signaling messages. In MMT, it is easy to use timed media data and non-timed media data constituting one channel (broadcast program) by combining different transmission paths. In the example shown in FIG. 5, as a broadcast signal 500, MMT transmission paths 501 to 504 are used for each type of data such as video, audio, subtitles, file data, and signaling messages. In the figure, the illustration of the transmission path for caption data is omitted for the sake of convenience.

MMTP (MMT protocol) packets transmitted on each of the MMT transmission lines 501 to 504 within the same IP address can be uniquely specified by a packet identifier (packet_id: PID). Also, MMTP packets on different IP addresses can be specified by a combination of packet identifier, IP address, and port number.

One channel (broadcast program) can be said to be a "package" composed of multiple assets of different types, such as video, audio, subtitles, and file data (data broadcasting application) (a package refers to an MMT transmission path). (a logical collection of media data transmitted using a Each asset is a set (logical group) of one or more MPUs sharing the same asset_id (asset identifier), and each is transmitted on a dedicated ES (Elementary Stream), that is, an MMT transmission path (an asset is a unique is an entity of data associated with an identifier and used to organize a multimedia presentation). That is, the transmission path 501 transmits video MMT packets (MMTP) composed of MPU logical groups having a common asset_id, and the transmission path 502 transmits audio MMT packets composed of MPU logical groups having a common asset_id. , the transmission path 503 transmits MMT packets of file data composed of MPU logical groups having a common asset_id. An MPU is identified by an asset_id and a sequence number of the MPU on the corresponding transmission path. Also, the MMT transmission line that transmits each medium can be identified by asset_id.

In addition, a single package (broadcast program) may transmit multiple assets of the same type (that is, with different asset_ids). For example, two or more file contents (data broadcasting applications) are provided for the same broadcast program. In such a case, different file contents will be assigned different asset_ids and transmitted over different MMT transmission paths as different MPU logical groups. In FIG. 5, only one transmission path 503 for file data is drawn for simplification.

Also, the MMT system can be used in common for a plurality of transmission paths for broadcasting and communications. For example, non-timed media such as HTML document data are transmitted together with timed media using a broadcast transmission line 504 as shown in FIG. can also

Also, on the transmission line 504, MMT packets containing the same signaling message are repeatedly transmitted. Signaling messages transmitted over transmission path 504 may include PA messages 510 , M2 section messages 520 , and data transmission messages 530 . Signaling tables are transmitted in various signaling messages.

For example, the PA message 510 is control information indicating the structure of a broadcast program, and includes an MP (MMT Package) table 511 describing information constituting a package such as a list of assets and their positions.

In the broadcasting standard that applies the media transport method by MMT, a fixed packet identifier (for example, 0x0000) is assigned to the MMTP packet that transmits the PA message. Therefore, the receiver side can acquire the PA message by designating the fixed packet identifier on the MMT transmission line. Then, referring to the MP table transmitted by the PA message, each asset (video, audio, subtitles, file data (data broadcasting application), etc.) making up the package (broadcast program) can be specified (Fig. 6).

Also, the M2 section message 520 is a message that transmits the section extension format of MPEG-2 Systems. Signaling tables such as MH-AIT (Application Information Table) 521 and EMT (Event Message Table) 522 are individually stored in the M2 section message 520 .

The MH-AIT 521 is a table that designates the processing method (activation state applied to the application, etc.) and the location (URL) of the data broadcasting application (file data) sent over the MMT transmission line.

The EMT 522 is a signaling table used in the event message transmission method, and stores information (event message descriptor) on event messages (synchronous/asynchronous messages from the broadcasting station to the application on the receiver). The event message transmission system provides means for sending message information from a broadcasting station to a data broadcasting application running in a receiver immediately or at a specified time.

Also, the data transmission message 530 is a message for transmitting control information regarding transmission of the data broadcasting application. One data transmission message 530 stores the signaling tables of a data directory management table 531, a data asset management table 532, and a data content configuration table 533. FIG.

The data directory management table 531 manages the directory structure related to the directories included in one package and the subdirectories and files (items) included in the directory in order to separate the file configuration of the application and the configuration for file transmission. and one stored in data transmission message 530 . Also, the data asset management table 532 is a table describing the configuration of the MPUs in the asset and the version information for each MPU. The data content configuration table 533 is a table describing configuration information of files as data content in order to realize flexible and effective cache control of file data for data broadcasting applications. Each content (data broadcasting application) is described in a data broadcasting presentation unit (PU) in one package. Detailed data structures of the data directory management table 531, data asset management table 532, and data content configuration table 533 are omitted here.

FIG. 7 illustrates how a receiver acquires files constituting a data broadcasting application to be MMT-transmitted.

A file constituting a data broadcasting application is specified with a path name in an application description such as HTML5. A path name here is written as a combination of a directory node name and a file name. Also, a node tag is defined as a descriptor that integrates directory nodes and files, and is used as information for linking each signaling table.

When the data broadcasting application designates the path name, the receiver, as indicated by reference number 701, retrieves the node/name of the file with the designated path name from the data directory management table in the data transmission message. get the tag.

The receiver then transmits the item with the node tag obtained in the data directory management table from the data asset management table, also in the data transmission message, as indicated by reference number 702. Get the component tag, download ID, MPU sequence number, and item ID of the asset being processed.

Further, when the receiver obtains the location information of the asset with the component tag obtained in the data asset management table from the MP table, as indicated by reference number 703, the receiver, as indicated by reference number 704: Identify the data asset in which the file in question is actually transmitted.

Then, the receiver uses the download ID obtained from the data asset management table and the download ID described in the multi-extension header area of the MMTP packet that transmits the item in the specified data asset to create a carousel. can uniquely identify a unit of repeated transmission of a file corresponding to . As indicated by reference number 705, among the repeatedly transmitted items, the item having the MPU sequence number and item ID obtained from the data asset management table can be designated as the desired file. The node tag shall be unique within a data transmission message, the MPU sequence number shall be unique within an asset, and the item ID shall be unique within a service provider.

In addition, by constantly monitoring the data asset management table, the receiver can detect that the files that make up the data broadcasting application have been updated, and can always present the data broadcasting application in the latest state. can. Update notification can be made at each stage, such as asset unit, MPU unit, and file unit. The Data Asset Management Table obtains the updated file's Component Tag, MPU Sequence Number and Item ID. Similar to the file acquisition shown in FIG. 7, the MP table is referenced to identify the asset, and the item having the obtained MPU sequence number and item ID is the desired updated file.

In short, the data directory management table and the data asset management table are essential signaling tables for acquiring information on files constituting a data broadcasting application to be MMT-transmitted in the receiver.

The data content configuration table is a table describing configuration information of files as data content in order to realize flexible and effective cache control of file data for data broadcasting applications. Specifically, the unit (for example, page) presented in the data content is defined as a presentation unit (PU), and the data content configuration table defines the relationship between items and the presentation・Describe information related to the link relationship with the unit. By referring to the data content configuration table, the receiver can select other items belonging to the same presentation unit as the first requested item when executing the data broadcasting application (presenting the page). can be specified. In addition, based on the data content configuration table, information necessary for cache control (pre-cache and forced cache) of the presentation unit can be obtained, so that the receiver can reduce the acquisition time of the entire page and Priority caching of the next page, etc. can be realized. For details of cache control based on the data content configuration table, see, for example, Japanese Patent Application No. 2014-116283 already assigned to the present applicant.

The data directory management table, the data asset management table, and the data content configuration table, together with the MH-AIT table, are necessary or important signaling tables used in the data broadcasting application transmission method. Please understand.

In FIG. 5, for convenience of explanation, all signaling messages describing the data broadcasting application and its control information from the key station (that is, only a single broadcasting station), which is the program production station, are in the same IP address. The structure of a broadcast signal is depicted on the assumption that it is transmitted within one IP data flow.

However, while the key stations, which are the producers of the broadcast programs themselves, mainly provide applications linked to the broadcast programs, each local station, which is the distributor, also provides their own applications. It is assumed for broadcasting. For example, a local station can provide localized information, such as weather forecasts and local news, through its own application, although it is not necessarily linked to the broadcast program itself. Furthermore, it is also assumed that a third party who is neither a program production office nor a distribution office distributes data broadcasting applications via a network such as the Internet. That is, there are a plurality of groups that should independently operate data broadcasting applications.

FIG. 8 shows an example of link relationships between data broadcasting applications produced by a program production station, a distribution station, and a third party for a certain broadcast program.

In FIG. 8, App1, App2, and App4 are broadcast programs themselves produced by the key stations themselves, which are program production stations, and data broadcasting applications related to or interlocked with the broadcast programs. A program production station transmits applications produced by itself such as App1, App2, and App4 as broadcast signals in the same IP data flow together with assets such as video, audio, subtitles, etc. that make up the body of a broadcast program.

Also, App3 and App5 are self-developed applications produced by local stations that are distribution stations. App3 and App5 are data broadcasting applications that are not linked to broadcast programs and provide information closely related to the region, such as weather forecasts and local news. The distribution station transmits its own applications such as App3 and App5 as broadcast signals using an IP data flow different from that used by the program production station to transmit the main body of the broadcast program.

Also, App6 is a data broadcasting application that is linked or not linked to a broadcast program, produced by a third party that is neither a program production station nor a distribution station. A third party distributes its own application such as App6 via a network such as the Internet. It should be noted that program production stations and distribution stations may also distribute their own data broadcasting applications via networks instead of broadcast signals.

In the example shown in FIG. 8, an application App1 produced by the program production office is set as a default entry for the broadcast program, and another application App2 produced by the program production office and an application App3 produced by the distribution office linked to. A page transition operation expected when a link relationship between applications as shown in the figure is formed will be described below.

A receiver that receives the broadcast program first executes application App1 when data broadcasting is started, and then transitions to application App2 or App3 according to user operations or event messages.

Application App2 produced by the program production office is further linked to another application App4 produced by the program production office and to application App5 produced by the distribution office. Therefore, after the receiver executes application App2 and makes a page transition, it makes a transition to application App4 or App5 according to the user's operation or event message.

Application App3 produced by the distribution station is further linked to another application App6 produced by a third party. Therefore, the receiver executes application App3 and transitions pages, and then transitions to application App6 according to user operations or event messages.

In the current data broadcasting using BML and operation of hybridcast broadcasting stations, especially in commercial broadcasting, the key station, which is the producer of the main body of the broadcast program, mainly uses applications linked to the broadcast program as shown in FIG. On the other hand, third parties other than local stations and broadcasting stations that are distributors also provide their own applications.

Even in the next-generation broadcasting standard that applies the media transport method by MMT, each local station or a third party other than the program production station will give its own application (that is, one broadcast program, multiple groups (each with its own application), the demands of commercial broadcasting should be fully considered.

Here, if all the data broadcasting applications of a plurality of groups are integrated into one system and operated, for example, it is necessary for the local stations to apply the data broadcasting applications to the broadcast programs distributed from the key stations. In such cases, the local stations must add or replace their own applications to the IP data flow through which the key stations transmit the broadcast programs and their accompanying applications and application control information. As a result, the burden of distribution facilities and distribution costs increases for local stations, and risks occur when adding or replacing applications, and the division of responsibility between key stations and local stations becomes unclear.

In this specification, data broadcasting services such as key stations as program production stations, local stations as distribution stations, and third parties are provided in the next-generation broadcasting standard that applies the media transport method by MMT. This paper proposes a technique for multiple groups to realize independent application operation. In the following, the proposed content will be described in more detail.

The PA message, which is one of the signaling messages, becomes the entry point of the broadcast program (a fixed packet identifier (for example, 0x0000) is assigned), and the PA message contains a package such as a list of assets and their positions. As already mentioned, the MP table that describes the information is included.

Also, the MH-AIT table, the data directory management table, the data asset management table, and the data content configuration table are important signaling tables used in the transmission system of data broadcasting applications. In addition to these, the EMT used in the event message transmission method is also a signaling table important for application operation.

Therefore, in order to realize independent operation of applications by each group that provides data broadcasting services, first, signaling messages and signaling tables are grouped for each group in which applications should be independently operated. Here, the signaling messages and signaling tables to be grouped are control data necessary or important for application operation, such as data transmission messages, MH-AIT, and EMT.

Then, a new descriptor called application service descriptor is placed in the MP table that describes the control information of the broadcast service level. In this application service descriptor, acquisition source information of each of the control data necessary or important for the operation of the application for each group and a group tag for identifying the group are indicated. The application service descriptor may also include a default flag indicating that the application is set to the default entry, and an organization identifier (organization_id) that identifies the organization to which each group belongs. . Depending on the acquisition destination information of the data transmission message, three signaling tables, the data directory management table, the data asset management table, and the data content configuration table, are stored in the same message. It indicates the acquisition destination information of On the other hand, the acquisition destination information of MH-AIT and EMT is equivalent to the acquisition destination information of the M2 section message storing each table individually.

In addition, the application service descriptor further indicates the variation of the format of the data broadcasting application used in the data broadcasting service provided by each group, and the information indicating the variation of the transmission method of the application control information and the content body of the application. You may do so.

FIG. 9 shows signals for distributing data broadcasting applications for each group for the same broadcast program and control information related to the applications through independent systems based on the information described in the application service descriptor as described above. A configuration example is shown. However, in the figure, it is assumed that there are three groups of application groups: key stations as program production stations, local stations as distribution stations, and third parties. The relationship is as shown in FIG.

Reference number 910 is the IP data flow generated by the programming office. IP data flow 910 includes multiple MMT transmission paths 911-914 within the same IP address. Within IP data flow 910 is the same IP address, and each MMTP packet to be transmitted can be specified by only the packet identifier.

The MMT transmission paths indicated by reference numbers 911 and 912 transmit video and audio data of broadcast programs produced by the program production department in MPU format, respectively. Also, the MMT transmission line indicated by reference number 913 transmits data broadcasting applications App1, App2, and App4 produced by the program production office in relation to the main body of the above broadcast program.

The MMT transmission line indicated by reference number 914 transmits control information related to the data broadcasting application transmitted on the MMT transmission line 913, that is, various signaling messages and signaling tables. In FIG. 9, for simplification of the drawing, MP table 914A stored in PA message and transmitted, and data transmission message (DTM) 914B, MH- Only AIT914C and EMT914D are drawn.

Reference number 920 is an IP data flow generated by a delivery station and includes multiple MMT transmission lines 921 and 922 .

The MMT transmission path indicated by reference number 921 transmits the data broadcasting application App3 produced by the distribution station in relation to the main body of the above broadcast program.

The MMT transmission line indicated by reference number 922 transmits control information related to the data broadcasting application transmitted on the MMT transmission line 921, that is, various signaling messages and signaling tables. In FIG. 9, only data transmission messages 922A, MH-AIT 922B, and EMT 922C, which are necessary or important for operating the data broadcasting application, are drawn for simplification of the drawing.

Reference numeral 930 is an IP network such as the Internet. The distribution station distributes over the IP network 930 the data broadcasting application App5 produced in relation to the main body of the broadcast program. A third party distributes over an IP network a data broadcasting application App6 produced in relation to the main body of the broadcast program. Furthermore, the third party distributes MH-AIT 931 describing the processing method (activation state applied to the application, etc.) and location information (URL) of the data broadcasting application App6 provided by itself over the IP network. Data broadcasting applications App5 and App6 distributed over the IP network do not require data transmission messages and EMT.

The MP table 914A stored in the PA message transmitted over the MMT transmission line 914 has application service descriptors arranged therein. In this application service descriptor, acquisition source information of each of the control data necessary or important for the operation of the application for each group and a group tag for identifying the group are shown. Specifically, the application service descriptor is associated with the group tag of the program production station, and the data transmission message 914B, the MH-AIT 914C, and the A data transmission message 922A that describes the acquisition destination information (packet identifier within the same IP address) of EMT 914D, is associated with the group tag of the distribution station, and is distributed from the distribution station with a broadcast signal (MMT transmission line), MH-AIT 922B and EMT 922C acquisition destination information (packet identifier, IP address, and port number) are described, and MH-AIT 931 distributed by a third party over an IP network in association with a third party's group tag It describes the acquisition destination information (URL) of the.

When the receiver receives the broadcast distribution signal from the program production station, it analyzes the MP table 914A stored in the PA message, which is the entry point of MMT-SI, and receives the broadcast signal (MMT transmission path) from the program production station. ), it is possible to obtain the acquisition destination information of the data transmission messages 914B, MH-AIT 914C, and EMT 914D. Then, based on MH-AIT914C, the receiver controls the application processing method of each data broadcasting application App1, App2, and App4 distributed from the program production station (activation state applied to the application, etc.) and location information (URL). can be obtained. In addition, the receiver refers to each signaling table stored in the data transmission message 914B to obtain files constituting each data broadcasting application to be MMT-transmitted (see FIG. 7). , and flexible cache control.

Also, the receiver can analyze the MP table 914A and obtain information on the acquisition destination of the data transmission messages 922A, MH-AIT 922B, and EMT 922C distributed by the broadcasting station (MMT transmission line). Then, based on MH-AIT922B, the receiver receives the processing method of each data broadcasting application App3 and App5 distributed from the program production station via the MMT transmission line and IP network (activation state applied to the application, etc.) and location information. (URL) can be obtained. In addition, the receiver refers to each signaling table stored in the data transmission message 922A to obtain files constituting the data broadcasting application App3 to be MMT-transmitted (see FIG. 7). , and flexible cache control.

In addition, the receiver can analyze the MP table 914A and obtain the acquisition destination information of the MH-AIT 931 distributed by the IP network from a third party. Then, based on MH-AIT931, the receiver acquires the processing method (activation state applied to the application, etc.) and location information (URL) of the data broadcasting application App6 distributed by a third party on the IP network. can be done.

The application service descriptor also indicates that a specific application is set as a default entry by a default flag for the MH-AIT that controls that application. Furthermore, the MH-AIT designates only one application among a plurality of applications to be controlled for automatic activation, and as a result, the specific application is recognized as the default entry. In the example shown in FIG. 9, the application service descriptor indicates that the application App1 distributed from the program production station is the default entry, together with the acquisition destination information of the MH-AIT 914C that controls App1, and the default flag (default_AIT_flag : to be described later). Therefore, when the receiver finds the default flag from the application service descriptor, the receiver detects the application App1, which is the only one among App1, App2, and App4 to be controlled in the MH-AIT distributed from the program production station. can be invoked as the default entry.

In short, as shown in FIG. 9, groups of a plurality of applications, such as key stations as program production stations, local stations as distribution stations, and third parties, are group-by-group data broadcasting applications and applications for the same broadcast program. , can be distributed in independent systems. Therefore, it is possible to independently operate the application for each group that provides the data broadcasting application.

Also, FIG. 10 shows a modification of the multi-system delivery signal shown in FIG. In the figure, it is assumed that there are three groups of applications: key stations as program production stations, local stations as distribution stations, and third parties. However, as shown in FIGS. 11 and 12, the link relationship between applications operated by each group changes due to program switching.

In the example shown in FIG. 10, it is assumed that the program #1, the program #2, and the program #3 are sequentially switched as time elapses. However, for the sake of simplification of the drawing, the IP data flow broadcast by the program production station does not include the video and audio MMT transmission paths that constitute the main body of the broadcast program.

In program #1, the link relationship between applications operated by each group is as shown in FIG. Therefore, the multi-system delivery signal for program #1 has the same configuration as that shown in FIG. 9, and the description thereof is omitted here.

In the subsequent program #2, the link relationship between the applications operated by each group is as shown in FIG. The key station, which is the program production station, has stopped the data broadcasting service in the IP data flow 1010 broadcast by the program production station. Along with this, the distribution of data transmission messages, signaling messages such as MH-AIT, EMT, and signaling tables has also stopped. On the other hand, the distribution station transmits data broadcasting applications App3 and App7 related to program #2 in the IP data flow 1020 broadcast by itself, and also sends signaling messages such as data transmission messages, MH-AIT, and EMT. It also distributes signaling tables. In addition, a default entry is set in App7 distributed from the distribution station, and a link relationship between applications is formed in which App7 refers to App3.

When the receiver receives the broadcast distribution signal from the program production station, the receiver analyzes the MP table stored in the PA message, which is the entry point of the program, and distributes it according to the time zone in which program #2 is broadcast. It is possible to obtain the acquisition destination information of the data transmission message, MH-AIT, which is distributed by the broadcast signal (MMT transmission line) from the station. Then, based on MH-AIT, the receiver receives the application processing method (activation state applied to the application, etc.) and location information (URL ) can be obtained. Also, the receiver refers to each signaling table stored in the data transmission message to acquire files constituting data broadcasting applications App3 and App7 to be MMT-transmitted (see FIG. 7). ) and flexible cache control.

In the application service descriptor, the default flag for the MH-AIT that controls the application indicates that the application is set as the default entry. In the time zone when program #2 is broadcast, a default flag (default_AIT_flag: described later) is set together with information on where to obtain MH-AIT from the distribution station to indicate that the data broadcasting application App7 distributed by the distribution station is the default entry. ). Therefore, when the receiver finds the default flag from the application service descriptor, the receiver defaults to the application App7 distributed from the distribution station, which is the only one among App3 and App7 to be controlled in the MH-AIT, which is set to be automatically started.・Can be started as an entry.

In the following program #3, the link relationship between the applications operated by each group is as shown in FIG. The key station, which is the program production station, transmits the data broadcasting application App8 related to program #3 in the IP data flow 1010 broadcast by its own station, and also transmits signaling messages such as data transmission messages, MH-AIT, and EMT. It also distributes messages and signaling tables.

In addition, for program #3, the distribution station transmits data broadcasting applications App3 and App7 related to program #3 using the IP data flow 1020 broadcast by itself, and also performs data transmission/reception related to these applications. It also distributes signaling messages such as messages, MH-AIT, and signaling tables.

In program #3, a third party distributes data broadcast application App9 and MH-AIT related to program #3 over IP network 1030. FIG.

In program #3, a default entry is set to App7 distributed from the distribution station, and a link relationship is formed between applications such that App7 refers to App3 and App8, and further App8 refers to App9. there is

When the receiver receives the broadcast distribution signal from the program production station, the receiver analyzes the MP table stored in the PA message, which is the entry point of the program, and selects the program according to the time slot in which program #3 is broadcast. Data transmission message distributed by the broadcasting signal (MMT transmission line) from the production station, MH-AIT and EMT acquisition destination information, Data transmission message distributed by the broadcasting signal (MMT transmission line) from the distribution station, It is possible to obtain MH-AIT acquisition source information and MH-AIT acquisition source information distributed from a third party over an IP network. Then, based on the MH-AIT for each group, the receiver receives data broadcasting application App8 distributed from the program production station, data broadcasting applications App3 and App7 distributed from the distribution station, and data broadcasting applications App3 and App7 distributed from a third party. It is possible to acquire the application processing method (activation state applied to the application, etc.) and the location information (URL) for each of the data broadcasting applications App9. Also, the receiver configures MMT-transmitted data broadcasting applications App3, App7, and App8 by referring to each signaling table stored in the data transmission message distributed from each of the program production station and the distribution station. (see Figure 7) and flexible cache control.

In the application service descriptor, the default flag for the MH-AIT that controls the application indicates that the application is set as the default entry. In the time slot when program #3 is broadcast, a default flag (default_AIT_flag: described later) is set together with information on where to obtain MH-AIT from the distribution station to indicate that the data broadcasting application App7 distributed by the distribution station is the default entry. ). Therefore, when the receiver finds the default flag from the application service descriptor, the receiver defaults to the application App7 distributed from the distribution station, which is the only one among App3 and App7 to be controlled in the MH-AIT, which is set to be automatically started.・Can be started as an entry.

FIG. 13 shows application distribution in which each group of the program production station and distribution stations A and B distributes data broadcasting applications for the same broadcast program for each group and control information related to the application through independent systems. A system system 1300 is shown schematically.

In the program production station 1310, an AV encoder 1311 including a video encoder, an audio encoder, etc., encodes data, such as video and audio, that constitute the body of a broadcast program. Also, the application generating unit 1312 generates, for example, a data broadcasting application linked to a broadcast program and control information related to the application. A multiplexer (MUX) 1313 multiplexes the encoded broadcast program data, the data broadcast application and its control information data.

When the program production office 1310 generates and encodes application-related control information, it places a new descriptor, the application service descriptor, in the MP table that describes the service level control information for the broadcast. Then, in this application service descriptor, acquisition source information of control data necessary or important for application operation for each group and a group tag for identifying the group are indicated. The control data necessary or important for application operation referred to here are data transmission messages, MH-AIT, and EMT.

Then, the multiplexed distribution signal is distributed from the program production station 1310 to each distribution station 1320, 1330 via a communication transmission path 1340 such as B2B.

In the distribution station 1320, an application generation unit 1321 generates a data broadcasting application that provides information closely related to the region, such as weather forecasts and local news, that is not linked to broadcast programs, and control information related to the application. . The multiplexer 1322 multiplexes the distribution signal distributed from the program production station 1310 and the data of the data broadcasting application and its control information.

When the distribution station 1320 generates and encodes control information related to its own application, it is necessary or important for the operation of its own application according to the acquisition destination information specified by the application service descriptor in the MP table. store control data. Then, the distribution station 1320 transmits the multiplexed distribution signal as a broadcast wave.

Similarly, in the distribution station 1330, an application generation unit 1331 generates a data broadcasting application that provides information closely related to the region, such as weather forecasts and local news. to generate The multiplexer 1332 multiplexes the distribution signal distributed from the program production station 1310 and the data of the data broadcasting application and its control information.

When the distribution station 1330 generates and encodes control information related to its own application, it is required or important for the operation of its own application according to the acquisition destination information specified by the application service descriptor in the MP table. store control data. Then, the distribution station 1330 transmits the multiplexed distribution signal as a broadcast wave.

As shown in FIG. 13, application operation can be implemented independently for each group that provides data broadcasting applications.

As described above, in the technology disclosed in this specification, in order for multiple groups that provide data broadcasting services to realize operation of applications that are independent of each other, the PA message that is the entry point of MMT-SI Place a new descriptor called Application Service Descriptor in the MP table stored in the .

FIG. 14 shows a configuration example of a PA message 1401, which is one of signaling messages, and an MP table 1402 included in the PA message. Also, FIG. 15 shows an example data structure of the PA message 1500, and FIG. 16 shows an explanation of the parameters included in the PA message.

First, the data structure of the PA message will be explained. message_id is a 16-bit fixed value that identifies a PA message in various signaling information. version is an 8-bit integer parameter that indicates the version of the PA message. For example, if even some of the parameters that make up the MP table are updated, the version is incremented by +1. length is a 32-bit long parameter that indicates the size of the PA message in bytes, counted immediately after this field.

In the extension field, attribute information of the MP table (MPT) arranged in the subsequent payload field (message_payload) is arranged. The number_of_tables field indicates the number of MP tables stored in this PA message. In the attribute information loop that is repeated by the number indicated by number_of_tables, table_id, table_version, and table_length are arranged as attribute information of each MP table. table_id indicates the identification information of the MP table stored in this PA message. table_version indicates the version of the MP table stored in this PA message. table_length indicates the size in bytes of the MP table stored in this PA message.

MP tables are arranged in the payload field of the PA message by the number indicated by number_of_tables. The MP table stores information related to packages including a list of all assets (see Figure 6).

FIG. 17 shows an example data structure of the MP table 1700 stored in the PA message. Also, FIG. 18 shows an explanation of the parameters included in the MP table. The configuration of the MP table will be described below.

table_id is an 8-bit fixed value that identifies an MP table in various signaling information. Version is an 8-bit integer value indicating the version of the MP table. For example, if some of the parameters that make up the MP table are updated, version is incremented by +1. length is a 32-bit long parameter that indicates the size of the MP table in bytes, counted immediately after this field. Also, MPT_mode indicates the operation when this MP table is divided into subsets, but the detailed explanation is omitted.

MMT_package_id_length indicates the size of text information of package identification information (MMT_package_id) in bytes. In the subsequent package identification information loop, MMT_package_id is indicated in bytes (MMT_package_id_byte). MMT_package_id is identification information of an entire package whose constituent elements are all signals (video, audio, subtitles) transmitted by broadcast signals, and assets such as file data. This identification information is text information, and the upper 16 bits have the same value as the service identification information for identifying the service.

MMT_descriptor_length indicates the size of the MP table descriptor area in bytes. In the subsequent MP table descriptor loop, the contents of the MP table descriptor are written in byte units (MPT_descriptors_byte). The MP_table_descriptors field is a storage area for descriptors related to the entire package. The Application Service Descriptor is located as one of the MP Table Descriptors. The application service descriptor indicates information for each group of applications that should be operated independently.

number_of_assets is an 8-bit parameter that indicates the number of assets (signals, files) that constitute the package. Asset information loops are arranged for the number of number_of_asset. The information placed within the asset information loop is described below.

identifier_type indicates the identity scheme of the MMTP packet flow. If it is an ID system indicating asset identification information, it is set to 0x00. asset_id_scheme indicates the format of asset identification information. asset__id_length indicates the size of text information of asset identification information (asset_id) in bytes. In the loop of asset identification information that follows, asset_id is indicated in units of bytes (asset_id_byte).

asset_type indicates the type of asset in 32 bits. asset_clock_relation_flag indicates the presence or absence of an asset clock information field. location_count indicates the number of location information of the asset, and location information MMT_general_location_info of the corresponding asset is indicated in the subsequent loop of location information repeated by the number of location_count. The data structure of MMT_general_location_info will be described later. asset__descriptor_length indicates the size of text information of the asset descriptor (asset_descriptor) in bytes. In the asset descriptor loop that follows, the content of asset_descriptor is indicated in units of bytes (asset_id_byte).

FIG. 19 shows an example data structure of an application service descriptor placed in the MP table.

descriptor_tag (descriptor tag) identifies a descriptor with an 8-bit field. descriptors_length is the area to write the number of data bytes following this field.

application_format_map indicates an application used by the data broadcasting application in an 8-bit bitmap. application_format_map is information indicating variations of application formats. By referring to the bitmap, the receiver can overview the applications to be used and appropriately process the format of the applications distributed by each group such as the program production station and the distribution station. For example, assuming that bit 0 indicates application format A, bit 1 indicates application format B, and bit 2 indicates application format C, if this value is 00000101 (binary), format A and format C are available. Indicates that it is applied. The receiver can thereby recognize that it is necessary to support both format A and format C in order to fully utilize this application service.

Application_transmission_use indicates the transmission method of application control information (one of broadcasting, communication, or both) with a 2-bit value. application_transmission_use is information indicating a variation of the transmission method of the application and the control information of the application. The receiver can refer to application_transmission_use to appropriately acquire applications distributed by various groups such as program production stations and distribution stations using various transmission methods.

number_of_delivery_segment represents the number of systems (groups) that transmit the data broadcasting application for the corresponding service (broadcast program). In the subsequent loop of the application transmission system, the system (group) information for each system (group) transmitting the application is shown. The contents of the system information included in each loop are described below.

The delivery_segment_tag is a 3-bit field that identifies the system (group). organization_indication_flag indicates whether organization_id (organization identification information) is included in the loop.

AIT_flag, DT_message_flag, and EMT_flag are flags respectively indicating whether or not MH-AIT, default_AIT, data transmission message, and EMT are transmitted from the system (group) as control information for data broadcasting applications. Also, default_AIT_flag is a default flag indicating whether or not the data broadcasting application transmitted from the system (group) is set as a default entry.

When the organization_indication_flag is 1, it indicates the organization identification information organization_id of the data broadcasting application to be activated in 16 bits.

When AIT_flag is 1, acquisition destination information AIT_location_info of signaling table MIT-AIT is indicated according to the data structure of MMT_general_location_info.

Also, when DT_message_flag is 1, the acquisition destination information DT_message_location_info of the data transmission message is indicated according to the data structure of MMT_general_location_info.

Also, when EMT_flag is 1, acquisition destination information EMT_location_info of the signaling table EMT is indicated according to the data structure of MMT_general_location_info.

FIG. 20 shows an example data structure of MMT_general_location_info (location information).

location_type indicates the type of location information with 8 bits and follows the allocation in Table 1 below.

packet_id indicates packet identification information of the MMTP packet.

ipv4_src_addr indicates the source address of the IPv4 data flow, and ipv4_dst_addr indicates the destination address of the IPv4 data flow. dst_port indicates the destination port number of the IP data flow. Also, ipv6_src_addr indicates the source address of the IPv6 data flow, and ipv6_dst_addr indicates the destination address of the IPv6 data flow.

network_id indicates network identification information for identifying a broadcasting network. MPEG_2_transport_stream_id indicates transport stream identification information for identifying MPEG-2 TS. MPEG_2_PID indicates packet identification information of MPEG-2 TS packets.

URL_length indicates the length in bytes of the URL bytes field. In the following URL byte loop, the URL string is indicated in bytes (URL_byte).

The technology disclosed herein has been described in detail above with reference to specific embodiments. However, it is obvious that those skilled in the art can modify or substitute the embodiments without departing from the gist of the technology disclosed in this specification.

The technology disclosed in this specification can be applied to various broadcasting systems that employ MMT as a transport method. Also, the technology disclosed in this specification can be applied to various data broadcasting systems that transmit file data used for data broadcasting linked to broadcast programs by the MMT method or other transport methods.

In short, the technology disclosed in this specification has been described in the form of an example, and the contents of this specification should not be construed in a limited manner. In order to determine the gist of the technology disclosed in this specification, the scope of claims should be considered.

It should be noted that the technology disclosed in this specification can also be configured as follows.
(1) a control information generator that generates control information related to an application for a broadcast program;
a transmission unit that transmits the control information generated by the control information generation unit;
and
The control information generation unit groups the control information for each group in which the application should be operated independently, and stores the acquisition destination information of the control information for each group in an application service descriptor arranged in a predetermined signaling table. and indicating the group identification,
transmitter.
(2) The control information generation unit arranges the application service descriptor in a signaling table (MP table) transmitted by a signaling message (PA message) serving as an entry point of signaling information (MMT SI). , indicating the acquisition source information and group identification information of the control information for each of the groups;
The transmission device according to (1) above.
(2-1) The control information generation unit arranges the application service descriptor in a signaling table (MP table) describing information constituting a package such as a list of assets and their positions, and indicating the acquisition source information and group identification information of the control information,
The transmission device according to (1) above.
(3) The control information generation unit stores, in the application service descriptor, acquisition destination information and group identification information of a signaling message or signaling table that stores control data necessary or important for operation of the application for each group. indicates a
The transmission device according to (1) above.
(4) The control information generation unit indicates acquisition source information and group identification information of the data transmission message, MH-AIT, and EMT for each group in the application service descriptor.
The transmission device according to (1) above.
(5) The control information generator further indicates, in the application service descriptor, a default flag indicating that the application is set to a default entry;
The transmission device according to (1) above.
(6) The control information generator further indicates, in the application service descriptor, an organization identifier that identifies an organization to which each group belongs.
The transmission device according to (1) above.
(7) The control information generator further indicates information indicating a variation of the application format in the application service descriptor.
The transmission device according to (1) above.
(8) The control information generation unit further indicates, in the application service descriptor, information indicating a variation of an application and a method of transmitting control information of the application.
The transmission device according to (1) above.
(9) an AV encoder that encodes the data of the main body of the broadcast program;
further comprising a file encoder for encoding file data of the application for the broadcast program;
The transmission unit multiplexes the control information with encoded data encoded by the AV encoder and the file encoder, respectively, and transmits the control information.
The transmission device according to (1) above.
(10) a control information generating step of generating control information related to an application for a broadcast program;
a transmission step of transmitting the control information generated in the control information generation step;
has
In the control information generation step, the control information is grouped for each group in which the application should be operated independently, and the acquisition destination information of the control information for each group is stored in an application service descriptor arranged in a predetermined signaling table. and indicating the group identification,
Send method.
(11) a control information receiving unit that receives control information related to an application for a broadcast program;
an application data control unit that controls execution of an application based on the control information received by the control information reception unit;
and
The application data control unit, based on the acquisition source information and group identification information of the control information for each group in which the application is to be operated independently, indicated by the application service descriptor arranged in the predetermined signaling table, get the application data transmitted from each group,
receiving device.
(12) The application data control unit uses the application service descriptor arranged in a signaling table (MP table) transmitted by a signaling message (PA message) as an entry point of signaling information (MMT SI). Acquiring the acquisition source information and group identification information of the control information for each of the groups from
The receiving device according to (11) above.
(13) The application data control unit obtains, from the application service descriptor, a signaling message or a signaling table storing control data necessary or important for operation of the application for each group, and group identification information. get information,
The receiving device according to (11) above.
(14) The application data control unit acquires acquisition destination information and group identification information of the data transmission message, MH-AIT, and EMT for each group from the application service descriptor.
The receiving device according to (11) above.
(15) The application data control unit launches an application for which a default flag is set in the application service descriptor as a default entry.
The receiving device according to (11) above.
(16) The application data control unit identifies the organization to which the group belongs based on the organization identifier indicated in the application service descriptor.
The receiving device according to (11) above.
(17) The application data control unit identifies the format of the application transmitted by each group based on the information indicated by the application service descriptor.
The receiving device according to (11) above.
(18) The application data control unit acquires applications and application control information to be transmitted by each group based on information indicating variations in the transmission method of the application and application control information indicated by the application service descriptor. do,
The receiving device according to (11) above.
(19) an AV decoder that decodes the data of the main body of the broadcast program;
a synthesizing unit that synthesizes the decoded broadcast program and the result of executing the application;
The receiving device according to (11) above, further comprising:
(20) a control information receiving step of receiving control information related to an application for a broadcast program;
an application data control step of controlling execution of an application based on the control information received in the control information receiving step;
has
In the application data control step, based on the acquisition source information and group identification information of control information for each group in which the application is to be independently operated, indicated by the application service descriptor arranged in the predetermined signaling table, get the application data to run,
receiving method.

DESCRIPTION OF SYMBOLS 10... Digital broadcasting system 11... Broadcast transmission system 12... Receiver 301... Clock part 302... Signal transmission part 303... Video encoder 304... Audio encoder 305... Caption encoder 306... Signaling encoder 307... File Encoder 308 Information System 309 TLV Signaling Encoder 310 IP Service Multiplexer 311 TLV Multiplexer 312 Modulator/Transmitter 401 Tuner/Demodulator 402 Demultiplexer 403 Clock 404 Video decoder 405 Audio decoder 406 Caption decoder 407 Application data control unit 408 Cache memory 409 Data broadcasting application engine 410 System control unit 411 Synthesis unit 412 IP interface 1300 Application distribution system system 1310 Program production station 1311 AV encoder 1312 Application generation unit 1313 Multiplexer 1320 Distribution station 1321 Application generation unit 1322 Multiplexer 1330 Distribution station 1331 Application generation unit 1332 Multiplexer

Claims (2)

a decoding step of decoding the data of the main body of the broadcast program;
a receiving step of receiving the application information table associated with the location information and default flags of the application information table contained in an application service descriptor located in a table describing information that constitutes a package;
a control step of controlling an application based on the application information table;
a synthesizing step of synthesizing the decoded video signal of the broadcast program and the display signal of the application;
receiving method . a decoding unit that decodes the data of the main body of the broadcast program;
a receiving unit for receiving the application information table associated with the location information and default flags of the application information table contained in an application service descriptor arranged in a table describing information constituting a package ;
a control unit that controls an application based on the application information table;
a synthesizing unit that synthesizes the decoded video signal of the broadcast program and the display signal of the application;
receiving device .

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