JP2018110434A - Receiving device and receiving method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To preferably transmit a data broadcast application and control information of the data broadcast application by a predetermined transport method.SOLUTION: For each group of applications to be operated independently, control data necessary or important for application operation such as data/transmission messages, MH AIT, and EMT are grouped. On an MP table that describes service/level control information of broadcast, an application service descriptor is placed, and acquisition destination information of each of the above-described control data to indicate group/tag for identifying a group, a default flag, and an organization identifier.SELECTED DRAWING: Figure 9

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, an ultra-high-definition TV broadcasting standard based on the MMT (MPEG Media Transport) (for example, see Non-Patent Document 1) standardized as a new media transport system in MPEG is examined. Has been. The MMT system can be easily used in a combination of different transmission paths, and can be used in common for a plurality of broadcast and communication transmission paths.

  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 system 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 body 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 broadcasting standards, each local station should fully consider the demands of private broadcasting to provide its own applications. If all data broadcasting services are integrated into one system, each local station must add or replace their own application for the data broadcasting data flow prepared by the key station. Don't be. As a result, local stations are forced to have excessive distribution costs and there is a risk that work will not be successful.

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 receiving method.

The present application has been made in consideration of the above problems, and the technology according to claim 1
A control information generator for generating 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 technique described in claim 2 of the present application, the control information generation unit of the transmission apparatus according to claim 1 stores the application information in a signaling table transmitted by a signaling message serving as an entry point of signaling information. A service descriptor is arranged to indicate acquisition 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 information and group identification information of a signaling message or signaling table for 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 as a default entry in the application service descriptor. It is configured to further indicate default flags.

  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 technique described in claim 7 of the present application, the control information generation unit of the transmission apparatus according to claim 1 may further indicate information indicating an application format variation in the application service descriptor. It is configured.

  According to the technique described in claim 8 of the present application, the control information generation unit of the transmission apparatus according to claim 1 indicates a variation of an application and application control information transmission method in the application service descriptor. It is configured to further indicate 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. An encoder is further provided. 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 generating step for 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 the acquisition information of the control information for each group is set in the application service descriptor arranged in a predetermined signaling table. And 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 for receiving 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 technology of claim 12 of the present application, the application data control unit of the receiving device of claim 11 is arranged in a signaling table that is transmitted by a signaling message that is 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 technique described in claim 14 of the present application, the application data control unit of the reception apparatus according to claim 11 can determine, from the application service descriptor, the data transmission message for each group, MH- AIT and EMT acquisition source information and group identification information are acquired.

  According to the technique described in claim 15 of the present application, the application data control unit of the receiving apparatus according to claim 11 sets an application in which a default flag is set in the application service descriptor as a default entry. Is configured to start as

  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. Is configured to identify the organization.

  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 technique described in claim 18 of the present application, the application data control unit of the reception apparatus according to claim 11 provides a variation of an application indicated by the application service descriptor and a transmission method of application control information. Based on the information shown, it is configured to acquire the application transmitted by each group and the control information of the application.

  According to the 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 technique described in claim 20 of the present application is:
A control information receiving step for 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,
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. An excellent receiving apparatus and receiving method can be provided.

  According to the technique disclosed in this specification, a data broadcasting application and an application for each group of 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 for the same broadcast program The control information related to can be distributed by independent systems. Therefore, it is not necessary to increase the responsibility demarcation between the key station and the local station and the burden on the distribution facility of the local station.

  In addition, the effect described in this specification is an illustration to the last, and the effect of this invention is not limited to this. In addition to the above effects, the present invention may have 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 diagram schematically illustrating a configuration example of a digital broadcasting system 10 to which the technology disclosed in this 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 path according to the MMT method. FIG. 6 is a diagram showing a mechanism for designating 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 data broadcasting applications produced by a program production station, a distribution station, and 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 broadcast. FIG. 13 is a diagram schematically showing an application distribution system system. FIG. 14 is a diagram illustrating 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 this 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. Broadcast signal transmission media 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 includes a key station (program production station) that is a producer of a program main body and each local station (distribution station) that is a distribution company for each region. 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. Further, when the receiver 12 acquires each file / data for data broadcasting from the received broadcast signal, the receiver 12 starts an application engine such as an HTML browser and presents the data broadcast linked to the broadcast program.

  FIG. 2 shows an example of a broadcast signal configuration in the case where MMT is applied as a transport method, as 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 headers of the IP 203 and the UDP 204, and a transmission control signal 206 as signaling information (Signaling Information: SI) are also placed.

  On the UDP 204, there are an MMT packet 207, an NTP (Network Time Protocol) packet 208 including information on the current time, and the like. The MMT protocol (MMTP) is an application layer transport protocol for transmitting the 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. The MFU 210 is an MPU fragment that 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 a recording / playback device such as a studio of a TV broadcast station or a VTR, for example, stream data such as timed media such as video, audio, and subtitles, and a file for a data broadcasting application that is non-timed 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 transmitted from the signal transmission unit 302, further packetizes it, and sends an IP packet including a video MMT packet 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. The caption encoder 305 encodes the caption signal transmitted from the signal transmission unit 302, further packetizes it, and sends an IP packet including the 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: PA (Package Access) 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. Send to IP service multiplexer 310. The file data constitutes a data broadcasting application.

  The broadcast transmission system 11 is equipped with an IP service multiplexer 310 for each channel (broadcast program) to be transmitted. 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 A TLV packet constituting a channel is generated.

  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 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 sends it to the RF transmission line. 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 path.

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

  In the clock unit 301, time information synchronized with the time information acquired from the NTP server is generated, 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 a video MMT packet. 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. • Sent 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 packet to be generated is 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. A unit 407, a cache memory 408, a data broadcast application engine 409, a system control unit 410, a synthesis unit 411, and an IP interface 412.

  The tuner / demodulator 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, NTP time information, signaling information, video, audio, 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 broadcast application linked to a broadcast program and control information related to the data broadcast application is output. The file data used for data broadcasting is a data broadcasting application described in, for example, HTML5 format.

  The video decoder 404 decodes the encoded video signal obtained by the demultiplexer 402 to obtain a baseband video signal. The audio decoder 405 decodes the encoded audio signal obtained by the demultiplexer 402 to obtain a baseband audio signal. 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. 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 the 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 synthesizer 411 synthesizes a subtitle display signal and a data broadcast display signal with the baseband video signal to obtain a video signal for video display. The baseband audio signal obtained by the audio decoder 405 is an audio signal for audio output. The main part of the broadcast program composed of video signals and audio signals is output as video and audio from a monitor display (not shown). Further, the data broadcast processed by the data broadcast application engine 409 is also displayed on the monitor / display with being superimposed on the main screen of the broadcast program.

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

  The tuner / demodulator 401 receives the RF modulated 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 this 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 the 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. Further, the file data extracted by the demultiplexer 402 is sent to the data broadcast application engine 407 for processing, and a data broadcast display signal is obtained. The system controller 410 controls the filtering operation in the demultiplexer 402 so that only necessary file data is acquired by the demultiplexer 402.

  The synthesizing unit 411 synthesizes the subtitle display signal and the data broadcast display signal 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. The main part of the broadcast program composed of video signals and audio signals 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 the processing of an HTML document or the like. 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. 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 a 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). In addition, MMTP packets on different IP addresses can be specified by a combination of a packet identifier, an IP address, and a port number.

  One channel (broadcast program) can be called a “package” composed of a plurality of assets of different types such as video, audio, subtitles, and file data (data broadcasting application) (a package is an MMT transmission line). 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 other words, a plurality of assets of the same type (that is, different asset_id) may be transmitted in one package (broadcast program). For example, two or more file contents (data broadcasting application) are 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 system provides a means for sending message information from a broadcasting station to a data broadcasting application operating on a receiver immediately or at a specified 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 related to the directories included in one package and the subdirectories and files (items) included in the directory in order to separate the file configuration of the application from 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 for 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. Description of 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 is omitted.

  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 designated with a path name from the data broadcasting application, as indicated by reference numeral 701, the receiver receives the node name of the file with the designated path name from the data directory management table in the data transmission message. Get the tag.

  The receiver then transmits 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 acquires the 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 within the data transmission message, the MPU sequence number is unique within the asset, and the item ID is unique within the service provider.

  In addition, the receiver can constantly monitor the data asset management table to detect that the files that make up the data broadcast application have been updated, and always present the latest data broadcast application. it can. The update notification can be made at each stage of asset unit, MPU unit, and file unit. The component tag, MPU sequence number, and item ID of the updated file are obtained by the data asset management table. 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.

  The data content configuration table is a table describing configuration information of files as data contents in order to realize flexible and effective cache control of file data for a data broadcasting application. 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 information about 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, the information required for presentation unit cache control (pre-cache and forced cache) can be obtained based on the data content configuration table, so the receiver can shorten the acquisition time of the entire page, A preferential cache of the next page can be realized. For details of the cache control based on the data content configuration table, see, for example, Japanese Patent Application No. 2014-116283 already assigned to the present applicant.

  The data directory management table, the data asset management table, and the data content configuration table are necessary or important signaling tables used for the transmission system of the data broadcasting application together with the MH-AIT table. Please 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, the operation of the data broadcasting service in which the key station, which is the main producer of the broadcast program, mainly gives applications linked to the broadcast program, while each local station that is the distribution company also gives its own application It is assumed in broadcasting. 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. Further, it is assumed that a third party who is neither a program production station nor a distribution station distributes a data broadcasting 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 a link relationship between data broadcast applications produced by a program production station, a distribution station, and a third party for a 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 an application produced by itself such as App1, App2, and App4 as a broadcast signal in the same IP data flow together with assets constituting the broadcast program body such as video, audio, and subtitles.

  Further, App3 and App5 are in-house applications produced by local stations that are distribution stations. App3 and App5 are data broadcasting applications that are not linked to a broadcast program and provide information closely related to the area such as weather forecasts and local news. 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. Link to A page transition operation expected when a link relationship between applications as shown in the figure 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, the receiver executes the application App2 to change the page, and then changes to the application App4 or App5 in accordance with 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. On the other hand, a third party other than each local station or broadcasting station, which is a distribution company, is also operating to give its own application.

  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 full consideration to the demands of private broadcasters.

  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, generates a risk when adding or replacing applications, and the responsibility demarcation 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 propose a technique for multiple groups to realize independent application operations. 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 a broadcast program (a fixed packet identifier (for example, 0x0000) is assigned), and a package such as an asset list and its position is formed in the PA message. As described above, 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 arranged in the MP table describing the control information of the broadcast service level. In this application service descriptor, the acquisition destination 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 This indicates the acquisition destination information. 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 it.

  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. A configuration example 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 specified only by the packet identifier.

  The MMT transmission paths indicated by reference numbers 911 and 912 transmit video and audio data of the broadcast program main body produced by the program production station in the MPU format. 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 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 lines 921 and 922.

  The MMT transmission path indicated by reference numeral 921 transmits the data broadcast application App3 produced by the distribution station in association with the 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. The third party distributes the data broadcast application App6 produced in relation to the broadcast program main body on 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. For the data broadcasting applications App5 and App6 distributed on the IP network, the data transmission message and EMT are not required.

  An application service descriptor is arranged in the MP table 914A stored in the PA message transmitted through the MMT transmission path 914. In this application service descriptor, the 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 shown. 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. ) Can be obtained from the transmission destination information of the data transmission message 914B, MH-AIT 914C, and EMT 914D. 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). Can be obtained. 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 MH-AIT 922B, the receiver processes each data broadcasting application App3, App5 distributed from the program production station through the MMT transmission path and the IP network (startup state applied to the application, etc.) and location information. (URL) can be acquired. 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.

  Further, the receiver can obtain the acquisition destination information of the MH-AIT 931 distributed from the third party over the IP network by analyzing the MP table 914A. 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 do.

  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 indicates that the application App1 distributed from the program production station is a default entry, together with the acquisition destination information of the MH-AIT 914C that controls App1, and a default flag (default_AIT_flag). : Described later). Therefore, when the receiver finds the default flag from the application service descriptor, the application App1 that is set to be automatically activated among App1, App2, and App4 to be controlled in the MH-AIT distributed from the program production station. Can be started as the 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. Control information related to can be distributed in independent systems. Therefore, the operation of the application can be realized independently for each group that provides the data broadcasting application.

  FIG. 10 shows a modification of the multi-system distribution 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 FIGS. 11 and 12, the link relationship between applications operated by each group changes due to program switching.

  In the example shown in FIG. 10, it is assumed that the program # 1, the program # 2, and the program # 3 are sequentially switched 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, the multi-system distribution signal in program # 1 has the same configuration as that shown in FIG.

  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 App 7 distributed from the distribution station, and a link relationship between applications is formed in which App 7 to App 3 are referred to.

  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.

  Further, the application service descriptor indicates that an application is set as a default entry by a 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. ). 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. Messages, signaling messages such as MH-AIT, and signaling tables are also distributed.

  In program # 3, a third party distributes data broadcasting applications App9 and MH-AIT related to program # 3 on 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. Yes.

  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. Further, the receiver configures the data broadcasting applications App3, App7, and App8 that are MMT-transmitted with reference to the respective signaling tables stored in the data transmission messages distributed from the program production station and the distribution station, respectively. Files to be acquired (see FIG. 7), and flexible cache control can be performed.

  Further, the application service descriptor indicates that an application is set as a default entry by a 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. ). 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. In addition, the application generation unit 1312 generates, for example, a data broadcast application linked to a broadcast program and control information related to the application. The multiplexer (MUX) 1313 multiplexes the encoded broadcast program data, the data broadcast application, and the control information data thereof.

  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. In the application service descriptor, control data acquisition destination information necessary or important for application operation for each group and a group tag for identifying the group are indicated. The control data necessary or important for the operation of the application here is a data transmission message, MH-AIT, or 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.

  Necessary or important for the operation of the own application, according to the acquisition source information specified by the application service descriptor in the MP table, when the control information related to the own application is generated and encoded in the distribution station 1320 To store various control data. Then, the multiplexed distribution signal is transmitted from the distribution station 1320 as a broadcast wave.

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

  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. To store various control data. 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 this specification, a PA message that serves as an entry point of MMT-SI in order for a plurality of groups that provide data broadcasting services to operate independent applications. 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. The version is an 8-bit integer value parameter indicating the version of the PA message. For example, when some parameters constituting the MP table are also updated, version is incremented by +1. The 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 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. The 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 the PA message in 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 a data structure example of the MP table 1700 stored in the PA message. FIG. 18 shows an explanation 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 some parameters constituting the MP table are also updated, 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. MPT_mode indicates the operation when this MP table is divided into subsets, but detailed description thereof is omitted.

  MMT_package_id_length indicates the size of text information of the package identification information (MMT_package_id) in bytes. In the subsequent package identification information loop, MMT_package_id is indicated in bytes (MMT_package_id_byte). MMT_package_id is identification information 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 following MP table descriptor loop, 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 the package. There are as many asset information loops as number_of_assets. Information arranged in the asset information loop will be described below.

  identifier_type indicates the ID system of the MMTP packet flow. If the ID system indicates asset identification information, 0x00 is set. 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. In a loop of location information repeated for the number of subsequent location_counts, 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 the text information of the asset descriptor (asset_descriptor) in bytes. In the asset descriptor loop that follows, the contents of asset_descriptor are indicated in units of bytes (asset_id_byte).

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

  The descriptor_tag (descriptor tag) identifies the descriptor with an 8-bit field. Descriptors_length is an area in which the number of data bytes following this field is written.

  application_format_map indicates an application used by the data broadcasting application in a bit map having an 8-bit length. application_format_map is information indicating a variation of the 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 has been applied. This allows the receiver to recognize that both format A and format C need to be supported in order to fully use the 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 distributed by each group such as a program production station and a distribution station using various transmission methods with reference to the 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 the system information included in each loop will be described below.

  delivery_segment_tag identifies the system (group) in 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 organization_indication_flag is 1, the organization identification information organization_id of the data broadcasting application to be started 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 shows a data structure example 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 the MPEG-2 TS. MPEG_2_PID indicates packet identification information of the MPEG-2 TS packet.

  URL_length indicates the length of the URL byte field in bytes. In the subsequent URL byte loop, the URL character string is indicated in 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 gist of the technology disclosed in this specification, the claims should be taken into consideration.

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) that is transmitted by a signaling message (PA message) serving as an entry point of signaling information (MMT SI). , Indicating the acquisition information and group identification information of the control information for each group,
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 application control information in the application service descriptor.
The transmission device according to (1) above.
(9) an AV encoder that encodes broadcast program data;
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 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 the acquisition information of the control information for each group is set in the 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 device.
(12) The application data control unit includes the application service descriptor arranged in a signaling table (MP table) that is transmitted in a signaling message (PA message) that is an entry point of signaling information (MMT SI). From the acquisition information and group identification information of the control information for each group,
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 the data of the broadcast program body;
A combining unit that combines the decrypted 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,
Receiving method.

DESCRIPTION OF SYMBOLS 10 ... Digital broadcasting system 11 ... Broadcast transmission system, 12 ... Receiver 301 ... Clock part, 302 ... Signal transmission part, 303 ... Video encoder 304 ... Audio encoder, 305 ... Caption encoder 306 ... Signaling encoder, 307 ... File encoder 308 ... Information system, 309 ... TLV signaling encoder 310 ... IP service multiplexer 311 ... TLV multiplexer, 312 ... 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 for controlling the 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 main body constituting the service;
A synthesizing unit that synthesizes the decrypted broadcast program and the result of executing the application;
The receiving device 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 the application based on the application information table and the event message table received in the receiving step;
Receiving method.