JP6551558B2 - Receiving apparatus and receiving method - Google Patents

Description

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

  In the current broadcasting system, MPEG-2 TS (Moving Picture Experts Group-2 Transport Stream) method and 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 by MPEG (for example, refer to Non-Patent Document 1) A study on ultra high resolution TV broadcasting standard Has been. In the MMT method, it is easy to use a combination of different transmission paths, and can be commonly used for a plurality of transmission paths of broadcasting and communication.

  At the time of this application, an ultra-high resolution TV broadcast standard based on the MMT system is being studied. Also, stream media of broadcast programs such as video, audio, and subtitles are transmitted in a Timed MPU (Media Processing Unit) format, while being used for data broadcast applications and applications such as HTML (Hyper Text Markup Language) documents. A scheme for transmitting related control information in a non-timed MPU format is also defined.

  In the data broadcasting service, it is assumed that the key station that is the producer of the broadcast program will mainly give the application linked to the broadcast program, while each local station that is the distribution company will also give its own application. . Each local station is not necessarily linked to the main part of the broadcast program, but it provides information closely related to the area, such as weather forecasts and local news, in its own application, and it is possible to realize a data broadcasting service with fine granularity for each area There is.

  In the current data broadcasting using BML (Broadcast Markup Language) and the operation of the broadcast station of the hybrid cast, especially in the private broadcasting, from the viewpoint of not increasing the burden of the distribution facility of the responsibility demarcation and the local station, Control information related to the application is also considered to be distributed independently for the key station and the local station.

  When considering next-generation broadcast standards, each local station should fully consider the requirements of private broadcasts to provide their own applications. Here, if all the data broadcasting services are integrated into one system, the data flow of the data broadcasting prepared at the key station must be added or replaced with its own application at each local station. Don't be. As a result, the local station is forced to have an excessive delivery cost, and there is also a risk that the work will not go well.

JP, 2013-153291, A

ISO / IEC FDIS 23008-1: 2013 (E) Information technology-High efficiency coding and media delivery in heterogeneous environments-Part1: MPEG mediator MT

  An object of the technology disclosed in the present specification is to provide an excellent transmission apparatus and transmission method capable of suitably transmitting a data broadcasting application and its control information by a predetermined transport method.

  The purpose of the technology disclosed in this specification is to suitably receive a data broadcast application and its control information transmitted by a predetermined transport method, and execute the data broadcast application based on the control information. An object of the present invention is to provide an excellent receiving apparatus and a receiving method.

The present application has been made in consideration of the above problems, and the technology according to claim 1 is
A control information generation unit that generates control information related to an application for a broadcast program;
A transmission unit for transmitting the control information generated by the control information generation unit;
Comprising
The control information generation unit groups the control information for each group in which an application should be operated independently, and obtains the control information acquisition information for each group in an application service descriptor arranged in a predetermined signaling table. And group identification information,
It is a transmission device.

  According to the technology described in claim 2 of the present application, the control information generation unit of the transmission apparatus according to claim 1 transmits the signaling table transmitted in the signaling message to be the entry point of the signaling information. A service descriptor is arranged to indicate acquisition destination 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 according to claim 1 includes, 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 technology 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 technology described in claim 5 of the present application, the control information generation unit of the transmission device according to claim 1 indicates that the application is set to the default entry in the application service descriptor. It is configured to further indicate the default flag.

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

  According to the technology described in claim 7 of the present application, the control information generation unit of the transmission device according to claim 1 further causes the application service descriptor to further indicate information indicating a variation of the format of the application. It is configured.

  According to the technology described in claim 8 of the present application, the control information generation unit of the transmission device according to claim 1 indicates a variation of a method of transmitting application and application control information in the application service descriptor. It is configured to further show the information.

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

Further, the technique according to claim 10 of the present application is
A control information generation 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;
Have
In the control information generation step, the control information is grouped for each group in which the application should be operated independently, and acquisition destination information of the control information for each group is included in an application service descriptor arranged in a predetermined signaling table. And indicate group identification information,
It is a transmission method.

Moreover, the technique according to claim 11 of the present application is
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 receiving unit;
Comprising
The application data control unit, based on the acquisition destination information and group identification information of control information for each group that should operate the application independently, indicated by the application service descriptor arranged in a predetermined signaling table, Get application data transmitted from each group,
It is a receiving device.

  According to the technique described in claim 12 of the present application, the application data control unit of the receiving device according to claim 11 is disposed in a signaling table transmitted by a signaling message serving as an entry point of signaling information. Further, it is configured to acquire the control information acquisition destination information and group identification information for each group from the application service descriptor.

  According to the technique of claim 13 of the present application, the application data control unit of the reception apparatus of claim 11 is necessary or important for the operation of the application for each group from the application service descriptor. It is configured to acquire acquisition information and group identification information of a signaling message or signaling table that stores control data.

  According to the technology described in claim 14 of the present application, the application data control unit of the reception device according to claim 11 transmits the data transmission message for each group, MH − from the application service descriptor. AIT and EMT acquisition source information and group identification information are acquired.

  According to the technology described in claim 15 of the present application, the application data control unit of the receiving apparatus according to claim 11 makes a default entry of an application for which a default flag is set in the application service descriptor. It is configured to launch.

  According to the technique described in claim 16 of the present application, the application data control unit of the receiving apparatus according to claim 11 has a group to which the group belongs based on the organization identifier indicated by the application service descriptor. Configured to identify the

  According to the technique described in claim 17 of the present application, the application data control unit of the reception apparatus according to claim 11 can determine an application transmitted by each group based on information indicated by the application service descriptor. It is configured to identify the format.

  According to the technology described in claim 18 of the present application, the application data control unit of the receiving apparatus according to claim 11 is a variation of the method of transmitting the application indicated by the application service descriptor and the control information of the application. It is configured to obtain the application transmitted by each group and control information of the application based on the information shown.

  According to the technique described in claim 19 of the present application, the receiving apparatus according to claim 11 includes an AV decoder that decodes data of a broadcast program body, and a combining unit that combines a result of executing the decoded broadcast program and an 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 for the broadcast program;
An application data control step for controlling the execution of the application based on the control information received in the control information receiving step;
Have
In the application data control step, based on the acquisition destination information and group identification information of the control information for each group to be operated independently of the application indicated by the application service descriptor arranged in a predetermined signaling table, Get application data to run
It is a receiving method.

  According to the technique disclosed in this specification, it is possible to provide an excellent transmission apparatus and transmission method that can suitably transmit a data broadcast application and its control information by a predetermined transport method.

  Further, according to the technology disclosed in this specification, it is possible to suitably receive a data broadcast application and its control information transmitted by a predetermined transport method, and execute the data broadcast application based on the control information. It is possible to provide an excellent receiving apparatus and receiving method.

  According to the technology disclosed in the present 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 are data broadcasting applications and applications for each group for the same broadcast program. The control information related to can be distributed by independent systems. Therefore, it is not necessary to increase the burden of the division of responsibility between the key station and the local station and the distribution facility of the local station.

  The effects described in the present specification are merely examples, and the effects of the present invention are not limited thereto. In addition to the effects described above, the present invention may exhibit additional effects.

  Other objects, features, and advantages of the technology disclosed in the present specification will become apparent from a more detailed description based on the embodiments to be described later and the accompanying drawings.

FIG. 1 is a view schematically showing a configuration example of a digital broadcast system 10 to which the technology disclosed in the present specification is applied. FIG. 2 is a diagram showing a broadcast signal stack model 200 to which MMT is applied. FIG. 3 is a diagram illustrating a configuration example of the broadcast transmission system 11 that transmits the broadcast signal illustrated in FIG. 2. FIG. 4 is a diagram illustrating a configuration example of the receiver 12 that receives the broadcast signal illustrated in FIG. 2. 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 method. FIG. 6 is a diagram showing a mechanism for specifying each asset of the package from the MP table in the PA message. FIG. 7 is a diagram for explaining a mechanism for acquiring a file constituting a data broadcasting application transmitted by MMT. FIG. 8 is a diagram showing an example of a link relationship between a program production station, a distribution station, and a data broadcasting application produced by a third party. FIG. 9 is a diagram illustrating a configuration example of a signal for distributing a data broadcasting application for each group and its control information in an independent system. FIG. 10 is a diagram showing a modification of the multi-system distribution signal shown in FIG. FIG. 11 is a diagram showing a link relationship between applications operated by each group in a time zone in which program # 2 in FIG. 10 is broadcast. FIG. 12 is a diagram showing a link relationship between applications operated by each group in a time zone in which program # 3 in FIG. 10 is shown. 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 of the data structure of the PA message 1500. FIG. 16 is a diagram illustrating the parameters included in the PA message. FIG. 17 is a diagram showing an example of the data structure of the MP table 1700. FIG. 18 is a diagram illustrating the parameters included in the MP table. FIG. 19 shows an example of the data structure of the application service descriptor. FIG. 20 is a diagram illustrating a data structure example 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 broadcast system 10 to which the technology disclosed in the present specification is applied. The illustrated digital broadcast system 10 includes a broadcast 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 method when a broadcast signal is transmitted from the broadcast transmission system 11 to the receiver 12.

  The broadcast transmission system 11 transmits an IP (Internet Protocol) broadcast signal including a transmission medium. Transmission media for broadcast signals includes both timed media and non-timed media such as files. The timed media is stream data related to a broadcast program body such as video, audio, and subtitles. Non-timed media is each file data used for data broadcasting, such as an HTML document. Both timed and non-timed data are transmitted in MPU format.

  In the present embodiment, the broadcast transmission system 11 is composed of a key station (program production station) which is a production source of a program main body, and each local station (distribution station) which is a distribution provider for each area. The key station multiplexes and transmits the data broadcast application mainly linked to the broadcast program to the produced broadcast program body. Each local station multiplexes and transmits its own data broadcast application to the broadcast program body provided by the key station. The local data broadcasting application for each local station is not necessarily linked 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 a broadcast signal transmitted from the broadcast transmission system 11. Then, the receiver 12 acquires transmission media such as video, audio, and subtitles from the received broadcast signal and presents images and sounds. Also, when each file data for data broadcasting is acquired from the received broadcast signal, the receiver 12 activates an application engine such as an HTML browser to present data broadcasting interlocking with the broadcast program.

  FIG. 2 shows an example of a broadcast signal configuration in the case of applying MMT as a transport method by a stack model 200.

  At the bottom layer of the stack model 200 is a physical layer (PHY) 201. The physical example 201 includes a modulation scheme and an error correction scheme.

  On the physical layer 201, there is a layer 202 of a transmission packet 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. Also, 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.

  On the UDP 204, an MMT packet 207, an NTP (Network Time Protocol) packet 208 including information on the current time, and the like are placed. MMT protocol (MMTP) is an application layer transport protocol for transmitting MMTP payload 209 over an IP network.

  The MMT payload 209 of the MMT packet 207 includes an MFU (MMT Fragment Unit) 210 or a signaling message (Signaling Message) 211 related to data broadcasting. MFU 210 is a fragment of MPU, which is a container for encoded timed media as well as non-timed media. In the MFU 210, 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.

  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 a production source of a broadcast program body, or each local station (distribution station) that is a distribution company. The broadcast transmission system 11 shown in the figure 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, information The system 308 includes a TLV signaling encoder 309, an IP service multiplexer (MUX) 310, a TLV multiplexer (MUX) 311, and a modulation / transmission unit 312.

  The clock unit 301 generates time information synchronized with the time information acquired from the NTP server (not shown), and sends an IP packet including the 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, and is a streamed data such as video, audio, subtitles which is timed media, and a file for data broadcasting application which is nontimed media. Data (such as HTML document data) is sent to the video encoder 303, the audio encoder 304, the caption encoder 305, and the file encoder 307, respectively.

  The information system 308 is a scheduler of a TV broadcast station and a file supply source, and sends a data broadcast application that is non-timed media and control information related to the data broadcast application to a file encoder 307 and a signaling encoder 306, respectively. When the broadcast transmission system 11 is a program production station such as a key station, the information system 308 mainly transmits a data broadcast application linked to the broadcast program and control information related thereto to the file encoder 307 and the signaling encoder 306, respectively. To do. Further, in the case of a distribution station such as a local station, the information system 308 may display its own data broadcast application including information closely related to each region (not necessarily linked to a broadcast program) and control information related thereto, The data is sent to the file encoder 307 and the signaling encoder 306.

  The video encoder 303 encodes the video signal sent from the signal sending unit 302, further packetizes it, and sends an IP packet including an MMT packet of video to the IP service multiplexer 310. Also, the audio encoder 304 encodes the audio signal sent from the signal sending unit 302, further packetizes it, and sends an IP packet including an audio MMT packet to the IP service multiplexer 310. In addition, the caption encoder 305 encodes the caption signal sent from the signal sending unit 302, further packetizes it, and sends an IP packet including a caption MMT packet to the IP service multiplexer 310.

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

  The file encoder 307 divides the file data transmitted from the signal transmission unit 302 or the information system 308 as necessary, generates an MMT packet including the file data, and generates an IP packet including the MMT packet. It is sent to the IP service multiplexer 310. The file data constitutes a data broadcasting application.

  The broadcast delivery system 11 equips an IP service multiplexer 310 for each channel (broadcast program) to be delivered. The IP service multiplexer 310 for one channel multiplexes IP packets including video, audio, subtitles, signaling messages, and file data sent from the respective encoders 303 to 307, thereby Generate TLV packets that make up the channel.

  The TLV signaling encoder 309 encodes signaling information sent from the information system 308 and generates a TLV packet to be placed in the payload portion.

  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.

  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 provided, but from the program production station via the B2B communication path or the like. The configuration is such that the broadcast stream is received and 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 transmits the resultant to the RF transmission path. However, when the broadcast transmission system 11 is a program production station, the modulation / transmission unit 312 transmits a 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 time information acquired from the NTP server, and an IP packet including the time information is generated.

  The video signal transmitted from the signal transmission unit 302 is supplied to the video encoder 303. In the video encoder 303, the video signal is encoded and further packetized to generate an IP packet including an MMT packet of video. This IP packet is sent to the IP service multiplexer 310.

  The same processing is performed on the audio signal and subtitle signal transmitted from the signal transmission unit 302. The IP packet including the audio MMT packet generated by the audio encoder 304 is sent to the IP service multiplexer 310, and the IP packet including the caption MMT packet generated by the caption encoder 305 is transmitted to the IP service multiplexer 310. Send to multiplexer 310.

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

  The 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 an MMT packet including the file data, and generates an IP packet including the MMT packet. This IP packet is sent to the IP service multiplexer 310.

  In each IP service multiplexer 310, IP packets including video, audio, subtitles, signaling messages, and file data sent from the encoders 303 to 307 are multiplexed to form one channel. TLV packets are generated.

  In the TLV signaling encoder 309, the signaling information sent from the information system 308 is encoded to generate a TLV packet to be placed in the payload portion.

  In the TLV multiplexer 311, the TLV packets generated by the IP service multiplexers 310-1 to 310 -N and the TLV signaling encoder 309 are multiplexed 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 sends the RF modulation signal to the RF transmission path.

  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 unit 401, a demultiplexer (DEMUX) 402, a clock unit 403, a video decoder 404, an audio decoder 405, a caption decoder 406, and application data control. The system includes a unit 407, a cache memory 408, a data broadcasting application engine 409, a system control unit 410, a combining unit 411, and an IP interface 412.

  The tuner / demodulation unit 401 receives the RF modulation signal, performs demodulation processing, and obtains a broadcast stream. The demultiplexer 402 performs demultiplexing processing and packetization processing on this broadcast stream to obtain NTP time information, signaling information, video, audio, and caption encoded signals related to the main part of the broadcast program, A signaling message including file data (such as an HTML document) for a data broadcasting application linked to a broadcast program and control information related to the data broadcasting application is output. The file data used for data broadcasting is, for example, a data broadcasting application described in HTML5 format.

  The 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 subtitle signal obtained by the demultiplexer 402 to obtain a subtitle display signal.

  The application / data control unit 407 processes each file / data for the data broadcasting application. In the present embodiment, it is assumed that file data for a data broadcast application is transmitted from two systems of a broadcast signal and an IP network, the former is via a tuner / demodulator 401 and a demultiplexer 402, and the latter is an IP interface. Each of them is acquired by the application / data control unit 407 via 412. The application data control unit 407 controls processing of the acquired file data based on the control information described in the signaling message output from the demultiplexer 402. For example, when the application data control unit 407 analyzes the signaling message and finds a data broadcasting application set in the default entry, the application data control unit 407 processes the corresponding file data (HTML document or the like) such as an HTML browser. It instructs the data broadcasting application engine 409. The application data control unit 407 controls pre-cache and forced cache of the file data received by the broadcast signal to the cache 408 based on the signaling message. For details of the file data cache processing based on the signaling message, refer to, for example, Japanese Patent Application No. 2014-116283 already assigned to the present applicant.

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

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

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

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

  The tuner / demodulation unit 401 receives the RF modulation signal, performs demodulation processing, and obtains a broadcast stream. In the demultiplexer 402, this broadcast stream is subjected to demultiplex processing and packetization processing, NTP time information, signaling messages, video, audio, caption encoded signals, and file data. Is extracted.

  The NTP time information extracted by the demultiplexer 402 is sent to the clock unit 403. The clock unit 403 generates time information synchronized with the time information based on the NTP time information. That is, the clock unit 403 generates time information that matches 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 a video decoder 404 and decoded to obtain a baseband video signal. Also, the encoded subtitle signal extracted by the demultiplexer 402 is sent to the caption decoder 406 and decoded to obtain a subtitle 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. The system control unit 410 controls the filtering operation in the demultiplexer 402 so that only the necessary file data is acquired by the demultiplexer 402.

  Then, in the combining unit 411, a subtitle display signal and a data broadcast display signal are combined with the baseband video signal to obtain a video signal for video display.

  Also, 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 broadcast program main body 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 file data (for data broadcasting application) to the data broadcasting application engine 409 such as an HTML browser ( Instructs processing of HTML documents etc.). For example, when the application data control unit 407 analyzes the signaling message and finds a data broadcasting application set in the default entry, the application data control unit 407 processes the corresponding file data (HTML document or the like) such as an HTML browser. It instructs the data broadcasting application engine 409.

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

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

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

  MMTP (MMT protocol) packets transmitted through the MMT transmission paths 501 to 504 in 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 (broadcasting program) can be said to be a "package" consisting of multiple assets of different types such as video, audio, subtitles, file data (data broadcasting application), etc. Logical set of media data transmitted using Each asset is a set (logical group) of one or more MPUs sharing the same asset_id (asset identifier), and each asset is transmitted on a dedicated ES (Elementary Stream), that is, an MMT transmission path. Data entity associated with an identifier and used to compose 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. In the transmission path 503, an MMT packet of file data consisting of an MPU logical group having a common asset_id is transmitted. The MPU is specified by asset_id and the sequence number of the MPU on the corresponding transmission path. Further, the MMT transmission path for transmitting each medium can be identified by asset_id.

  In addition, in one package (broadcast program), a plurality of assets of the same type (ie, different asset_id) may be transmitted. For example, two or more file contents (data broadcast applications) may be provided for the same broadcast program. In such a case, different asset_ids are allocated to different file contents, and are transmitted on different MMT transmission lines as different MPU logical groups. In FIG. 5, only one transmission path 503 for file data is drawn for simplification.

  Further, the MMT method can be commonly used for a plurality of broadcast and communication transmission paths. For example, non-timed media such as HTML document data is provided via a communication transmission line such as an IP network in addition to being transmitted together with timed media using a broadcast transmission line 504 as shown in FIG. You can also.

  Further, on the transmission path 504, MMT packets including the same signaling message are repeatedly transmitted. Examples of the signaling message transmitted on the transmission line 504 include a PA message 510, an M2 section message 520, and a data transmission message 530. A signaling table is transmitted in various signaling messages.

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

  In the broadcast standard to which the media transport method by MMT is applied, a fixed packet identifier (for example, 0x0000) is assigned to the MMTP packet that transmits the PA message. Therefore, on the receiver side, the PA message can be acquired by designating the fixed packet identifier on the MMT transmission path. Then, by referring to the MP table transmitted by the PA message, each asset (video, audio, subtitle, file data (data broadcasting application), etc.) constituting the package (broadcast program) can be designated (FIG. 5). 6)).

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

  The MH-AIT 521 is a table that specifies a processing method (such as an activation state applied to an application) and a location (URL) of a data broadcasting application (file data) sent through the MMT transmission path.

  The EMT 522 is a signaling table used for the event message transmission method, and stores information (event message descriptor) regarding the event message (synchronous / asynchronous message from the broadcasting station to the application on the receiver). The event message transmission scheme provides a means to send message information from a broadcast station to a data broadcast application operating on a receiver, either immediately or at a designated time.

  The data transmission message 530 is a message for transmitting control information related to transmission of the data broadcast application. One data transmission message 530 stores the signaling tables of the data directory management table 531, the data asset management table 532, and the data content configuration table 533.

  The data directory management table 531 manages the directory structure of the directory 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. One table is stored in the data transmission message 530. The data asset management table 532 is a table describing version information of each MPU with the configuration of the MPU in the asset. The data content configuration table 533 is a table describing configuration information of files as data contents in order to realize flexible and effective cache control of file data for data broadcasting applications. Each content (data broadcast application) is described in a data broadcast presentation unit (PU) in one package. The detailed data structures of the signaling tables of the data directory management table 531, the data asset management table 532, and the data content configuration table 533 will not be described.

  FIG. 7 illustrates a mechanism for acquiring a file constituting a data broadcast application transmitted by MMT in the receiver.

  A file constituting the data broadcasting application is designated with a path name in an application description such as HTML5. The path name here is described as a combination of a directory node name and a file name. Also, a node tag is defined as a descriptor integrating a directory node and a file, and used as information for linking each signaling table.

  When the receiver is specified a path name from the data broadcast application, as indicated by reference numeral 701, the file node of the specified path name from the data directory management table in the data transmission message Get the tag.

  The receiver then transmits an 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 numeral 702. Get the component tag, download ID, MPU sequence number, and item ID of the asset being played.

  Further, when the receiver obtains location information of the asset having the component tag obtained in the data asset management table from the MP table, as indicated by reference numeral 703, as indicated by reference numeral 704, Identify the data asset in which the file 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 for transmitting the item in the specified data asset, to determine the carousel. It is possible to uniquely identify a unit of repeated transmission of a file corresponding to. As indicated by a reference number 705, an item having an MPU sequence number and an item ID obtained from the data asset management table can be designated as a desired file among items repeatedly transmitted. The node tag is unique in the data transmission message, the MPU sequence number is unique in the asset, and the item ID is unique in the service provider.

  Also, by constantly monitoring the data asset management table, the receiver detects that the files constituting the data broadcasting application have been updated, and can always present the data broadcasting application in the latest state. it can. The update notification can be made at each stage of asset unit, MPU unit, and file unit. The data asset management table obtains the component tag of the updated file, the MPU sequence number and the item ID. Similar to the file acquisition shown in FIG. 7, an asset is identified with reference to the MP table, and an item having the obtained MPU sequence number and item ID is a desired updated file.

  In short, the data directory management table, the data asset management table, and the signaling table essential for acquiring information about the files constituting the data broadcasting application transmitted by MMT in the receiver.

  Also, the data content configuration table is a table in which file configuration information as data content is described in order to realize flexible and effective cache control of file data for data broadcasting applications. Specifically, a unit (for example, a page) to be presented in the data content is defined as a presentation unit (PU), and the data content configuration table is a unit for the relationship between items, presentation, and so on. Describe the information on the link relationship with the unit. When the receiver executes the data broadcasting application (presents the page) by referring to the data content configuration table, the receiver selects other items belonging to the same presentation unit as the originally requested item. Can be specified. In addition, since the information necessary for cache control (pre-cache and forced cache) of the presentation unit can be obtained based on the data content configuration table, the receiver can reduce the acquisition time of the entire page, A preferential cache of the next page can be realized. For details of cache control based on the data content configuration table, refer to, for example, Japanese Patent Application No. 2014-116283, which has been assigned to the present applicant.

  The data directory management table, the data asset management table, and the data content configuration table are necessary or important signaling tables used for the transmission system of the data broadcasting application together with the MH-AIT table. I want you to understand that.

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

  However, while the key station that is the production source of the broadcast program itself mainly applies the application linked to the broadcast program, the operation of the data broadcasting service that each local station that is the distribution company also assigns its own application In broadcasting etc. it is assumed. For example, the local station is not necessarily linked to the main body of the broadcast program, but can provide information closely related to the area such as weather forecast and local news with its own application. Furthermore, it is also assumed that a third party who is neither a program production station nor a delivery station delivers the data broadcast application via a network such as the Internet. That is, there are a plurality of groups that should operate data broadcasting applications independently.

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

  In FIG. 8, App1, App2, and App4 are data broadcast applications related to or linked to the broadcast program main body and the broadcast program produced by the key station itself, which is the program production station. The program production station transmits the application produced at the local station such as App1, App2, App4 as a broadcast signal in the same IP data flow together with the assets constituting the broadcast program main body such as video, audio, subtitles and the like.

  Also, App3 and App5 are their own applications produced by the local station that is the distribution station. App3 and App5 are data broadcasting applications that are not linked to a broadcast program and provide information closely attached to the area, such as weather forecast and local news, for example. The distribution station transmits its own application such as App3 and App5 as a broadcast signal with an IP data flow different from that of the broadcast program body transmitted by the program production station.

  App 6 is a data broadcast application linked to or not linked to a broadcast program, produced by a third party who is neither a program production station nor a distribution station. Third parties distribute their own applications such as App6 via a network such as the Internet. Note that the program production station and the distribution station may also distribute the data broadcast application produced by the program production station and the distribution station via a network instead of a broadcast signal.

  In the example shown in FIG. 8, the application App1 produced by the program production station is set as the default entry of the broadcast program, the other application App2 produced by the program production station, and the application App3 produced by the distribution station. It is linked to. The page transition operation expected when the link relationship between the applications as illustrated is formed will be described below.

  The receiver that has received the broadcast program first executes the application App1 when starting data broadcasting, and then transitions to the application App2 or App3 in accordance with a user operation or an event message.

  The application App2 produced by the program production station is further linked to another application App4 produced by the program production station and the application App5 produced by the distribution station. Therefore, after executing the application App2 and transitioning the page, the receiver transitions to the application App4 or App5 according to a user operation or an event message.

  Further, the application App3 produced by the distribution station is further linked to another application App6 produced by a third party. Therefore, the receiver executes the application App3 to change the page, and then changes to the application App6 in response to a user operation or an event message.

  In current data broadcasting using BML and hybrid cast broadcasting station operation, especially in private broadcasting, as shown in FIG. 8, the key station that is the main producer of the broadcasting program is an application that is mainly linked to the broadcasting program. While each local station serving as a distribution company and a third party other than a broadcasting station have their own applications applied.

  Even in the next-generation broadcasting standard that applies the media transport system based on MMT, each local station and third party can add their own applications other than program production stations (that is, a plurality of groups for one broadcast program). Should give due consideration to the requirements of commercial broadcasts, each of which gives its own application).

  Here, if all the data broadcasting applications of a plurality of groups are integrated and operated in one system, for example, it is necessary to give the data broadcasting application to the broadcasting program distributed from the key station at the local station. In such a case, the local station must add or replace its own application to the IP data flow in which the key station transmits the broadcast program, the accompanying application, and control information of the application. As a result, the local station increases the burden of distribution facilities and distribution costs, and poses a risk when adding or replacing an application, and the division of responsibility between the key station and the local station becomes unclear.

  This specification provides data broadcasting services such as a key station as a program production station, each local station as a distribution station, and a third party in a next-generation broadcasting standard to which a media transport system based on MMT is applied. We will propose a technology to enable multiple groups to operate independent applications. In the following, the proposed content will be described in more detail.

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

  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 for the transmission system of the data broadcasting application. In addition to these, the EMT used for the event message transmission method is also an important signaling table for application operation.

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

  Then, a new descriptor called an application service descriptor is placed in the MP table describing control information of the service level of the broadcast. In the application service descriptor, acquisition source information of each 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 further indicate a default flag indicating that the application is set as a default entry and an organization identifier (organization_id) for identifying the organization to which each group belongs. . The three signaling tables of the data directory management table, the data asset management table, and the data content configuration table stored in the message according to the acquisition destination information of the data transmission message It indicates the acquisition source 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 alone.

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

  FIG. 9 shows a signal for distributing the data broadcast application for each group for the same broadcast program and control information related to the application in an independent system based on the information described in the application service descriptor as described above. An example of the configuration is shown. However, in the figure, it is assumed that there are three groups of application groups: a key station as a program production station, a local station as a distribution station, and a third party, and links between applications operated by each group. The relationship is as shown in FIG.

  Reference numeral 910 is an IP data flow generated by the program production station. The IP data flow 910 includes a plurality of MMT transmission lines 911 to 914 within the same IP address. The IP data flow 910 has the same IP address, and each MMTP packet to be transmitted can be designated only by the packet identifier.

  The MMT transmission paths indicated by reference numerals 911 and 912 transmit video and audio data of the broadcast program main body produced by the program production station in the MPU format, respectively. Further, the MMT transmission path indicated by reference numeral 913 transmits data broadcast applications App1, App2, and App4 produced by the program production station in association with the broadcast program main body.

  The MMT transmission path indicated by reference number 914 transmits control information related to the data broadcasting application transmitted through the MMT transmission path 913, that is, various signaling messages and a signaling table. In FIG. 9, for simplification of the drawing, an MP table 914A that is stored and transmitted in a PA message, and a data transmission message (DTM) 914B and MH− that are necessary or important for operating a data broadcasting application are shown. Only the AIT914C and EMT914D are drawn.

  Reference numeral 920 is an IP data flow generated by the distribution station and includes a plurality of MMT transmission paths 921, 922.

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

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

  Reference numeral 930 is an IP network such as the Internet. The distribution station distributes the data broadcast application App5 produced in relation to the broadcast program main body on the IP network 930. In addition, the third party distributes the data broadcast application App6 produced in relation to the above-mentioned broadcast program main body over the IP network. Further, the third party distributes the MH-AIT 931 in which the processing method of the data broadcasting application App6 provided by the third party (the activation state applied to the application) and the location information (URL) are described on the IP network. The data transmission message and the EMT are not necessary for the data broadcasting applications App5 and App6 distributed on the IP network.

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

  When the receiver receives the broadcast distribution signal from the program production station, the receiver analyzes the MP table 914A stored in the PA message serving as the entry point of the MMT-SI, and transmits the broadcast signal (MMT transmission path) from the program production station. The acquisition source information of the data transmission message 914B, MH-AIT 914C, and EMT 914D distributed in step A.) can be obtained. Then, based on MH-AIT 914C, the receiver processes the application method of each data broadcasting application App1, App2, and App4 distributed from the program production station (such as an activation state applied to the application) and location information (URL). You can get Further, the receiver refers to each signaling table stored in the data transmission message 914B, and obtains a file constituting each data broadcasting application transmitted by MMT (see FIG. 7). Flexible cache control can be performed.

  Further, the receiver can obtain the acquisition destination information of the data transmission message 922A, MH-AIT 922B, and EMT 922C distributed from the distribution station via the broadcast signal (MMT transmission path) by analyzing the MP table 914A. Then, based on the MH-AIT 922 B, the receiver processes each data broadcasting application App3 and App5 (such as the activation state applied to the application) and location information distributed from the program production station via the MMT transmission path and the IP network. (URL) can be obtained. Further, the receiver refers to each signaling table stored in the data transmission message 922A to obtain a file constituting the data broadcasting application App3 transmitted by MMT (see FIG. 7). Flexible cache control can be performed.

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

  In the application service descriptor, the fact that a specific application is set as a default entry is indicated by a default flag for the MH-AIT that controls the application. Further, the MH-AIT designates only one application among a plurality of applications to be controlled and automatically starts up as a result, so that a specific application is recognized as a default entry. In the example shown in FIG. 9, the application service descriptor has a default flag (default_AIT_flag, together with acquisition source information of the MH-AIT 914C that controls App1 that the application App1 distributed from the program production station is the default entry. : Described later). Therefore, when the receiver finds the default flag from the application service descriptor, the application App1 for which only one of App1, App2, and App4 to be controlled is set to be automatically controlled in the MH-AIT distributed from the program production station. Can be launched as a default entry.

  In short, as shown in FIG. 9, a group of a plurality of applications such as a key station as a program production station, each local station as a distribution station, and a third party is a data broadcast application and application for each group for the same broadcast program. The control information related to can be distributed in independent systems. Therefore, the application operation can be realized independently for each group providing the data broadcast application.

  Further, FIG. 10 shows a modification of the multi-system delivery signal shown in FIG. In this figure, it is assumed that there are three groups of application groups: a key station as a program production station, a local station as a distribution station, and a third party. However, as shown in FIG. 11 and FIG. 12, the link relationship between the 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 over time. However, for simplification of the drawing, the video and audio MMT transmission lines constituting the broadcast program body are omitted in the IP data flow broadcast by the program production station.

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

  In the subsequent program # 2, the link relationship between 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 delivery of signaling messages such as data transmission messages, MH-AIT, EMT, and signaling tables is also stopped. On the other hand, the distribution station transmits the data broadcasting applications App3 and App7 related to the program # 2 in the IP data flow 1020 broadcast by the local station, and signaling messages such as data transmission message, MH-AIT, and EMT. As well as a signaling table. In addition, a default entry is set in App7 delivered from the delivery station, and a link relationship between applications that references App7 from App7 is formed.

  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 when program # 2 is broadcast. It is possible to obtain data transmission message and MH-AIT acquisition destination information distributed from a station via a broadcast signal (MMT transmission path). Then, based on the MH-AIT, the receiver processes each data broadcasting application App3, App7 distributed from the distribution station through the MMT transmission path (such as an activation state applied to the application) and location information (URL) ) Can be obtained. Further, the receiver refers to each signaling table stored in the data transmission message and obtains the files constituting the data broadcasting applications App3 and App7 transmitted by MMT (see FIG. 7). ), Flexible cache control can be performed.

  The application service descriptor also indicates that the application is set to the default entry by the default flag for the MH-AIT that controls the application. In the time zone in which the program # 2 is broadcast, the default flag (default_AIT_flag: described later), together with the MH-AIT acquisition destination information from the distribution station, indicates that the data broadcast application App7 distributed from the distribution station is the default entry. It shows by). Therefore, when the receiver finds the default flag from the application service descriptor, the application App7 distributed from the distribution station, which is set as the only automatic start among App3 and App7 to be controlled in the MH-AIT, is set as the default.・ It can be activated as an entry.

  In the subsequent program # 3, the link relationship between 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 the program # 3 in the IP data flow 1010 broadcast by the own station, and the signaling transmission such as the data transmission message, MH-AIT, and EMT. Messages and signaling tables are also distributed.

  Also, in the program # 3, the distribution station transmits the data broadcasting applications App3 and App7 related to the program # 3 by the IP data flow 1020 broadcast by the local station, and the data transmission and transmission related to these applications. It also delivers signaling messages such as messages, MH-AIT and signaling tables.

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

  In program # 3, a default entry is set for App7 distributed from the distribution station, and a link relationship between applications is created such that App7 to App3 and App8 are referenced, and App8 to App9 are referenced. 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 that is the entry point of the program, and matches the time slot when program # 3 is broadcast. Data transmission message delivered by broadcast signal (MMT transmission line) from production station, MH-AIT, EMT acquisition destination information, data transmission message delivered by broadcast signal (MMT transmission line) from distribution station, The MH-AIT acquisition destination information and the MH-AIT acquisition destination information distributed from the third party over the IP network can be obtained. Based on the MH-AIT for each group, the receiver is distributed from the data broadcast application App8 distributed from the program production station, the data broadcast applications App3 and App7 distributed from the distribution station, and third parties. Application processing method (such as an activation state applied to the application) and location information (URL) for each data broadcasting application App9. Also, the receiver refers to each signaling table stored in the data transmission message distributed respectively from the program production station and the distribution station, and configures the data broadcasting application App3, App7, App8 to be MMT transmitted. Files to be acquired (see FIG. 7), and flexible cache control can be performed.

  The application service descriptor also indicates that the application is set to the default entry by the default flag for the MH-AIT that controls the application. In the time zone in which the program # 3 is broadcast, the default flag (default_AIT_flag: described later), together with the acquisition destination information of the MH-AIT from the distribution station, indicates that the data broadcast application App7 distributed from the distribution station is the default entry. It shows by). Therefore, when the receiver finds the default flag from the application service descriptor, the application App7 distributed from the distribution station, which is set as the only automatic start among App3 and App7 to be controlled in the MH-AIT, is set as the default.・ It can be activated as an entry.

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

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

  When the program production station 1310 generates and encodes control information related to an application, a new descriptor called an application service descriptor is arranged in an MP table describing control information of a service level of broadcasting. Then, in the application service descriptor, information on acquisition source of control data necessary or important for application operation for each group and a group tag for identifying the group are indicated. As used herein, control data necessary or important for application operation are data transmission messages, MH-AIT, EMT.

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

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

  When generating and encoding control information related to its own application in distribution station 1320, it is necessary or important for operation of its own application as acquisition destination information specified in the application service descriptor in the MP table Control data is stored. Then, the multiplexed distribution signal is transmitted from the distribution station 1320 as a broadcast wave.

  Similarly, in the distribution station 1330, a data broadcasting application not linked to a broadcast program and control information related to the application, in which the application generation unit 1331 provides information closely attached to the area, such as weather forecast or local news, for example Generate The multiplexer 1332 multiplexes the distribution signal distributed from the program production station 1310, data broadcasting application, and data of control information thereof.

  Necessary or important for the operation of its own application according to the acquisition source information specified by the application service descriptor in the MP table when the distribution station 1330 generates and encodes control information related to its own application. Control data is stored. Then, the multiplexed distribution signal is transmitted from the distribution station 1330 as a broadcast wave.

  As shown in FIG. 13, the operation of the application can be realized independently for each group that provides the data broadcasting application.

  As described above, in the technology disclosed in the present specification, a PA message that is an entry point of MMT-SI in order to realize operation of independent applications by a plurality of groups providing data broadcasting services. A new descriptor called an application service descriptor is placed in the MP table stored in (1).

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

  First, the data structure of the PA message will be described. message_id is a 16-bit fixed value for identifying a PA message in various signaling information. version is an 8-bit integer parameter indicating the PA message version. For example, when some parameters constituting the MP table are also updated, version is incremented by +1. length is a 32-bit parameter indicating the size of the PA message in bytes, which is 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 to be stored in this PA message. Then, in the attribute information loop repeated for the number of times indicated by number_of_tables, table_id, table_version, and table_length are arranged as attribute information of each MP table. table_id indicates 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 of the MP table stored in this PA message in units of bytes.

  In the payload field of the PA message, as many MP tables as the number indicated by number_of_tables are arranged. The MP table stores information related to the package including a list of all assets (see FIG. 6).

  FIG. 17 shows an example of the data structure of the MP table 1700 stored in the PA message. Further, FIG. 18 shows a description of parameters included in the MP table. Hereinafter, the configuration of the MP table will be described.

  The table_id is an 8-bit fixed value that identifies the MP table in various signaling information. version is an 8-bit integer value indicating the version of the MP table. For example, when updating some parameters that configure the MP table, version is incremented by +1. The length is a 32-bit parameter indicating the size of the MP table in bytes, which is counted immediately after this field. Also, MPT_mode indicates the operation when this MP table is divided into subsets, but detailed description will be omitted.

  MMT_package_id_length indicates the size of text information of package identification information (MMT_package_id) in units of bytes. In the subsequent package identification information loop, MMT_package_id is indicated in units of bytes (MMT_package_id_byte). MMT_package_id is identification information as an entire package including assets such as all signals (video, audio, subtitles) and file data transmitted as broadcast signals. 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 loop of the MP table descriptor, the contents of the MP table descriptor are described in units of bytes (MPT_descriptors_byte). The MP_table_descriptors field is a storage area for descriptors related to the entire package. The application service descriptor is arranged as one of the MP table descriptors. The application service descriptor indicates information for each group of applications to be operated independently.

  number_of_assets is an 8-bit parameter indicating the number of assets (signals, files) as elements constituting a package. A loop of asset information is arranged for a few minutes of number_of_asset. The information placed in the asset information loop is described below.

  The identifier_type indicates an identifier system of the MMTP packet flow. In the case of an ID system that indicates asset identification information, it is 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 subsequent asset identification information loop, asset_id is indicated in bytes (asset_id_byte).

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

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

  The descriptor_tag (descriptor tag) identifies a descriptor by an 8-bit field. The descriptors_length is an area for writing the number of data bytes following this field.

  application_format_map indicates an application used by a data broadcasting application in a bitmap of 8 bits in length. application_format_map is information indicating a variation of an application format. By referring to the bitmap, the receiver can overlook the application to be used and appropriately process the format of the application distributed by each group such as a program production station and a 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, when this value is 00000101 (binary number), there are two formats, format A and format C. 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 the present application service.

  application_transmission_use indicates the transmission method of the control information of the application (either broadcast or communication, or both) as a 2-bit value. application_transmission_use is information indicating a variation of an application and a transmission method of control information of the application. The receiver can appropriately acquire an application that each group such as a program production station or a distribution station distributes in various transmission methods by referring to application_transmission_use.

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

  The delivery_segment_tag identifies this family (group) with a 3-bit field. organization_indication_flag indicates whether or not organization_id (organization identification information) is included in the loop.

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

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

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

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

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

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

  location_type indicates the type of location information in 8 bits, and follows the assignment 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. 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 broadcast network. MPEG_2_transport_stream_id indicates transport stream identification information for identifying an MPEG-2 TS. MPEG_2_PID indicates packet identification information of an MPEG-2 TS packet.

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

  As described above, the technology disclosed in this specification has been described in detail with reference to specific embodiments. However, it is obvious that those skilled in the art can make modifications and substitutions of the embodiments without departing from the scope 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. The technology disclosed in this specification can be applied to various data broadcasting systems that transmit file data used for data broadcasting linked to a broadcast program by the MMT method or other transport methods.

  In short, the technology disclosed in the present specification has been described in the form of exemplification, and the description content of the present specification should not be interpreted in a limited manner. In order to determine the scope of the technology disclosed herein, the claims should be referred to.

Note that the technology disclosed in the present specification can also be configured as follows.
(1) a control information generation unit that generates control information related to an application for a broadcast program;
A transmission unit for transmitting the control information generated by the control information generation unit;
Comprising
The control information generation unit groups the control information for each group in which an application should be operated independently, and obtains the control information acquisition information for each group in an application service descriptor arranged in a predetermined signaling table. And group identification information,
Transmitter device.
(2) The control information generation unit arranges the application service descriptor in a signaling table (MP table) transmitted by a signaling message (PA message) which is an entry point of signaling information (MMT SI). Indicating acquisition source information of the control information for each group and group identification information
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) that describes information constituting a package, such as a list of assets and their positions, for each group. Indicates the acquisition information and group identification information of the control information,
The transmission device according to (1) above.
(3) The control information generation unit stores the acquisition 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 in the application service descriptor. Showing,
The transmission device according to (1) above.
(4) The control information generation unit indicates, in the application service descriptor, data transmission message, MH-AIT, EMT acquisition destination information and group identification information for each group.
The transmission device according to (1) above.
(5) The control information generation unit further indicates a default flag indicating that the application is set as a default entry in the application service descriptor.
The transmission device according to (1) above.
(6) The control information generation unit further indicates an organization identifier for identifying an organization to which each group belongs in the application service descriptor.
The transmission device according to (1) above.
(7) The control information generation unit further indicates information indicating a format variation of the application in the application service descriptor.
The transmission device according to (1) above.
(8) The control information generation unit further indicates information indicating a variation of an application and a transmission method of control information of the application in the application service descriptor.
The transmission device according to (1) above.
(9) AV encoder for encoding data of broadcast program main body,
A file encoder for encoding file data of the application for the broadcast program;
The transmission unit multiplexes and transmits the control information with encoded data encoded by the AV encoder and file encoder,
The transmission device according to (1) above.
(10) a control information generation step for generating control information related to an application for a broadcast program;
A transmitting step of transmitting the control information generated in the control information generating step;
Have
In the control information generation step, the control information is grouped for each group in which the application should be operated independently, and acquisition destination information of the control information for each group is included in an application service descriptor arranged in a predetermined signaling table. And group identification information,
Transmission 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 receiving unit;
Comprising
The application data control unit, based on the acquisition destination information and group identification information of control information for each group that should operate the application independently, indicated by the application service descriptor arranged in a predetermined signaling table, Get application data transmitted from each group,
Receiver.
(12) The application data control unit is arranged in a signaling table (MP table) transmitted by a signaling message (PA message) which is an entry point of signaling information (MMT SI). Acquiring acquisition source information and group identification information of the control information for each group from the
The receiving device according to (11) above.
(13) The application data control unit obtains information and group identification of a signaling message or signaling table for storing control data necessary or important for the operation of the application for each group from the application service descriptor. Get information,
The receiving device according to (11) above.
(14) The application data control unit acquires the data transmission message, MH-AIT, EMT acquisition destination information and group identification information for each group from the application service descriptor.
The receiving device according to (11) above.
(15) The application data control unit activates, as a default entry, an application for which a default flag is set in the application service descriptor.
The receiving device according to (11) above.
(16) The application data control unit identifies an organization to which a group belongs based on an organization identifier indicated by the application service descriptor.
The receiving device according to (11) above.
(17) The application data control unit identifies a format of an application transmitted by each group based on information indicated by the application service descriptor.
The receiving device according to (11) above.
(18) The application data control unit acquires the application transmitted by each group and the control information of the application based on the information indicating the variation of the transmission method of the application and the control information of the application indicated by the application service descriptor. To
The receiving device according to (11) above.
(19) An AV decoder for decoding data of a broadcast program main body,
A synthesis unit for synthesizing the decoded broadcast program and the result of executing the application;
The receiving device according to (11), further including:
(20) a control information receiving step of receiving control information related to an application for a broadcast program;
An application data control step for controlling the execution of the application based on the control information received in the control information receiving step;
Have
In the application data control step, based on the acquisition destination information and group identification information of the control information for each group to be operated independently of the application indicated by the application service descriptor arranged in a predetermined signaling table, Get application data to run
Reception 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 ... Modulation / transmission unit 401 ... Tuner / demodulation unit 402 ... Demultiplexer 403 ... Clock unit, 404 ... Video decoder 405 ... Audio decoder, 406 ... Caption decoder 407 ... Application data control unit, 408 ... Cache memory 409 ... Data release Application engine 410 ... System control unit 411 ... Composition 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 (4)

The application information table is received based on the location information of the application information table and the default flag included in the application service descriptor arranged in the table describing the information constituting the package, and the location information of the event message table is received. A receiving unit for receiving the event message table based on:
A control unit that controls an application based on the application information table and the event message table;
A receiving apparatus comprising: The control unit controls an application state based on the application information table, and controls event message processing for the application based on the event message table.
The receiving device according to claim 1. An AV decoder for decoding data of a broadcast program body constituting a service ;
A synthesis unit that synthesizes the decoded broadcast program and the result of executing the application;
The receiver according to claim 1, further comprising: The application information table is received based on the location information of the application information table and the default flag included in the application service descriptor arranged in the table describing the information constituting the package, and the location information of the event message table is received. Receiving the event message table based on:
A control step of controlling an application based on the application information table and the event message table received in the receiving step;
Receiving method.