KR100684291B1 - Data broadcasting system for allocating variable bandwidth and method thereof - Google Patents

Abstract

A data transmission system of a variable bandwidth assignment type and a method therefor are provided to consider a characteristic of a plurality of data broadcasting contents, add/end new data broadcasting, and dynamically assign a variable bandwidth according to importance. An application registering unit(1003) updates registration information of an application in response to application start/stop information received from a transmission manager and a control message reception waiting string. A transmission bit rate setup unit(1005) assigns a bandwidth according to a rate of a current application for at least one of the number, a size, and the importance of all applications from a bandwidth corresponding to the total transmission rate for predetermined data broadcasting, according to the application information registered in the application. An object carousel encoder(1006) encodes application data to be transmitted to be repeatedly transmitted. An object carousel transmission unit(1008) transmits the encoded object carousel. A transmission state monitoring unit(1009) monitors the end and change of the application being transmitted, and notifies the end and change information to the control message reception waiting string.

Description

Data broadcasting system and method thereof with variable bandwidth allocation method

1 is a block diagram illustrating a digital broadcasting system to which the present invention can be applied.

2 is a block diagram illustrating a data broadcasting system according to an embodiment of the present invention.

3 is a block diagram illustrating a buffer model of an encoder of data according to an embodiment of the present invention.

4 is a block diagram showing the configuration of a data encoder according to an embodiment of the present invention.

5 is a flowchart illustrating a data transmission method according to an embodiment of the present invention.

6 is a flowchart illustrating a method of dynamically allocating and transmitting bandwidth for multiple applications according to an embodiment of the present invention.

The present invention relates to a system and method for transmitting a plurality of data broadcast content at a variable bit rate by allocating a variable transmission bandwidth in a data broadcast transmission system.

More specifically, the present invention relates to a system and method for allocating a dynamic bandwidth for each content within a predetermined bandwidth according to the number, size and importance of the broadcast content.

1 is a block diagram illustrating a digital broadcasting system to which the present invention can be applied.

The digital broadcast system 10 includes an AV transmitter 11, a data broadcast transmitter 500, a multiplexer 12, and a broadcast transmitter 13.

The AV transmitter 11 encodes and transmits audio and video signals serving as sources of digital broadcasting.

On the other hand, the data broadcast transmitting apparatus 500 encodes and transmits additionally provided data other than the audio and video broadcasting, for example, a program guide and bidirectional data communication service data.

The multiplexing device 12 forms a stream by multiplexing the audio and video data with data for data broadcasting. The stream is packetized and transmitted to the broadcast receiving device 30 through the broadcast network 20 through the broadcast transmitting device 13 in a predetermined size.

Meanwhile, terrestrial digital broadcasting is transmitted from a terrestrial broadcasting transmitter to a digital broadcasting receiver using 8-VSB modulation. Here, the 8-VSB modulation scheme maintains a 19.392 Mbps bit rate and transmits a transport stream. Depending on the broadcast environment of each broadcaster, within this bandwidth, a high-definition (HD) video stream occupies a transmission bandwidth of 17 to 18.5 Mbps, an audio stream of 384 Kbps, and other PSI / PSIP system information table sections of about 100 to 300 Kbps. Use bandwidth

 Therefore, a transmission bandwidth of about 700 Kbps to 1.5 Mbps can be used for the aforementioned data broadcast.

Therefore, in order to transmit a plurality of data broadcast contents in a predetermined transmission bandwidth environment, efficient bandwidth allocation is an important task for those skilled in the art.

That is, in the case of data broadcasting, when a plurality of applications are broadcast, bandwidth for each application must be dynamically allocated.

Multi-application transmission refers to transmission of one or more data broadcasting applications on a specific time axis. In order to transmit a plurality of applications, a transmission scheme using the aforementioned variable bandwidth allocation method is required. When only one application is transmitted, all bandwidth allocated for data broadcasting transmission is used for transmission of one application, but when the number of applications increases, multiple applications are multiplexed and transmitted, so the total transmission bandwidth must be shared. .

For example, when one application is transmitted at a moment, all bandwidths allocated for data broadcast transmission may be allocated to the application transmission currently being transmitted. After that, when one application transmission is added as a new service starts, two applications must share the transmission bandwidth of one application that is being transmitted.

In the opposite case, when two types of applications are being transmitted and one application is stopped, it is an efficient way to reallocate the bandwidth used by the stopped applications for all remaining applications.

However, the data broadcasting encoder of the fixed bit rate transmission method according to the related art sets the output bit rate for each data broadcasting related stream.

However, as the demand for a plurality of applications to be transmitted at the same time increases, the function of the existing system is expanded, and output bit rates are fixedly allocated to applications to be transmitted to a plurality of applications. When the output bit rate is fixedly allocated to each application, each application transmission bit rate is allocated within a predetermined bandwidth range in which the entire data broadcast can be transmitted.

However, in terms of configuring a program, each time a broadcast configuration changes, the configuration of a data service is changed, and the number of application transmissions for this is also changed. Therefore, when a fixed transmission bit rate is set for one data stream, if a bandwidth for transmitting a total of five applications is given, the moment of transmitting all five uses the given bandwidth to the maximum.

However, if the number of applications to be transmitted decreases due to the change in program configuration, the bandwidth occupied by one application is left as unused idle bandwidth. In order to overcome this problem, the transmission bit rate of each application must be readjusted whenever the data broadcasting configuration is changed, but there is a problem that the conventional technology cannot utilize the idle bandwidth.

In addition, a transmission bandwidth that can be used by one application is limited to an allocated fixed bandwidth, so that there is a limit that cannot improve the quality of a data broadcasting service, and cannot provide more applications than a predetermined number of applications. There is a limit.

In order to solve the above problems of the prior art, the present invention provides a broadcast system and method for allocating variable bandwidth to a plurality of data broadcast streams.

In addition, the present invention considers the characteristics of the contents of a plurality of data broadcasts being transmitted, and provides a system and method for dynamically allocating a variable bandwidth according to addition / end of a new data broadcast and its importance.

In order to achieve the above technical problem, a data broadcasting method according to an aspect of the present invention, a) receiving the application start information and registering the application; b) determining whether the application is currently being transmitted based on the application start information; c) if the application is not currently being transmitted, allocating a bandwidth according to at least one of the number of applications transmitted, the size of each application, and the importance of the application to generate a data encoder; d) transmitting the data stream according to the allocated bandwidth.

In addition, the data broadcasting system according to an aspect of the present invention, the application registration unit for updating the registration information of the application in response to the application start / stop information received from the dispatch manager and the control message receiving queue; A transmission bit rate setting unit for allocating a bandwidth according to a ratio of a current application to at least one of the number, size, and importance of all applications in a bandwidth corresponding to a predetermined total data rate for data broadcasting according to application information registered in the application; An object carousel encoder for encoding the application data to be repeatedly transmitted; An object carousel transmitter for transmitting the encoded object carousel; And a transmission status monitoring unit for monitoring the termination and the change of the application being transmitted to notify the control message receiving queue of the termination and change information.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

 In addition, when a part is said to "include" a certain component, which means that it may further include other components, except to exclude other components unless otherwise stated.

In addition, in the specification, the described module means "a block configured to change or plug in a system of hardware or software", that is, a unit or block that performs a specific function in hardware or software. do.

A data broadcasting system and an allocation method according to an embodiment of the present invention will now be described in detail with reference to the drawings.

2 is a block diagram illustrating a data broadcasting system according to an embodiment of the present invention.

According to an embodiment of the present invention, a data broadcasting system includes a play manager 530, a travel data DB 520, a play content DB 521, a data encoder 1000 and 1001, a PSIP encoder 550 and 551, and a multiplexer ( 560, a software download data DB 570, and a software download manager 580. In addition, the bidirectional data processor for bidirectional broadcasting includes a bidirectional processor 510, a real time processor 511, and an integrated update information processor 512.

Here, the transmission manager 530 collects information for controlling the entire data broadcasting transmission system, managing channel information, scheduling information, and generating electronic program guide (EPG) information.

The data encoder 1000 performs a substantial encoding operation for configuring an application as an object carousel (OC). In the embodiment of the present invention, in the data encoder 1000, the object carousel (OC) stream and the stream event (STE) section, and the application information table section (AIT Section) data stream are repetitive through the data sender block (Data Sender). The transfer operation is made. The data transmission block generates a data sender thread to perform a repetitive transmission operation in a thread loop and calculates the total amount of bit stream data every minute, thereby overflowing and shortening the output data stream. Controls the occurrence of underflow.

The PSIP encoder 550 generates and repeatedly transmits PSI / PSIP information. PSIP (Program and System Information Protocol) is a digital broadcasting system standard standard of the US ATSC. It is a channel standard that allows a broadcast receiver to recognize a channel, EPG information indicating an electronic program guide, rating information for each program, system time information, and the like. It serves to deliver to the receiver.

The multiplexer 560 multiplexes and streams the PSIP data and the object carousel information transmitted from the data encoders 1000 and 1001 and the PSIP encoders 550 and 551.

The driving data DB 520 and the transmitting content DB 521 store and transmit the data and the content data necessary for broadcasting operation to the transmitting manager 530, respectively.

The software download DB 570 stores software for driving broadcast content in a broadcast receiver for each product company and content.

The software download manager 580 manages the operation of transmitting and updating the software for each product company by content, and transmits the software and the update information to the data encoder 1000.

In addition, in the case of bidirectional broadcasting, a bidirectional processor 510, a real time processor 511, and an integrated update information processor 512 are dynamically generated for real-time bidirectional processing of a request and response of a subscriber through a return channel formed of a public network or an internet network. The received data is transmitted to the data encoder 1000.

The data generated by the system shown in FIG. 2 is broadcast to the receiving device through a predetermined bandwidth in the transport stream.

On the other hand, as described above, the data broadcast may be composed of a plurality of applications, while one application is transmitted, another application may be added, and conversely, some applications may be terminated while the plurality of applications are being transmitted. .

Therefore, the data encoder must have a buffer model for data transmission so that the transmission bit rate can be readjusted when the application starts or stops.

3 is a block diagram illustrating a buffer model of an encoder of data according to an embodiment of the present invention.

The buffer model included in the data encoder includes a data transmission block 100 and an AIT table transmission block 150, a multiplexer 160, a multiplexer output buffer 180, a NIC output device 170, and an ASI output device 190. ).

The data transmission block 100 includes an input buffer 110, a data transmission thread execution unit 120, and a first multiplexer buffer 130.

The data transmission block 100 generates a data transmission thread through the data transmission thread execution unit 120 to perform an iterative transmission operation in a thread loop. A plurality of data transmission blocks 100 may be generated according to the transmitted application.

Application data transmitted through the delivery manager or the like is temporarily stored in the input buffer 110. The data stored in the input buffer 110 is transmitted according to the data transmission thread generated by the data transmission thread generator 120. In this case, the data transmission thread transmits data by adjusting the transmission amount according to the allocated transmission bit rate, the data size of the input buffer 110, and the size of the first multiplexer buffer 130.

The application information table information transmitted from the AIT table transmission block 150 is multiplexed with the application data in the multiplexer 160 and temporarily stored in the multiplexer output buffer 180.

The multiplexer output buffer 180 is used as an input buffer of the output device of the data encoder, and the output device transmits data in the best buffer method when data exists in the input buffer. Therefore, the adjustment of the output bit rate is adjusted at the stage before the output device, and based on this, the output bit rate of the data encoder is adjusted.

Data stored in the multiplexer output buffer 180 is output through a network interface card (NIC) output device 170 and an actuator sensor interface (ASI) output device 190.

Hereinafter, the configuration of the data encoder for transmission of a plurality of applications will be described in detail based on the buffer model of the data encoder.

4 is a block diagram showing the configuration of a data encoder according to an embodiment of the present invention.

The data encoder of the present invention, which allocates a variable bandwidth to a plurality of applications, includes a control command reception queue 1002, an application registration unit 1003, a packet identifier allocation / release module 1004, a transmission bit rate setting unit 1005, and an object. A carousel encoder 1006, a transmission thread 1007, an object carousel transmitter 1008, and a transmission status monitor 1009.

The application registration unit 1003 registers an application based on the division key of the application transmitted from the delivery manager 530. Classification key values include Content ID, Application name, Application ID, and Component Tag.

On the other hand, after the application is registered in the application registration unit 1003 and transmission starts, the control operation is performed based on a pre-registered division key when processing a control command such as update or stop of an application from the control command reception queue 1002. Will be performed.

Upon receiving the application start / stop information, the application registration unit 1003 adds / deletes information for configuring an AIT table. The AIT table is configured to receive a start command or importance of an application, a name of an application shown to a user, and the like from a delivery manager.

When the packet identifier assignment / release module 1004 receives the start information of the data encoder from the delivery manager, the packet identifier assignment / release module 1004 is assigned a range of the packet identifier (PID) of the stream of data to be encoded by the data encoder. In the packet identifier, a PID is assigned to the same kind of data for each packet in the broadcast data stream packetized in MPEG-2 TS (Transport Stream) 188 bytes. Thereafter, in order to demultiplex the multiplexed (mixed A / V / Data streams) with each other, the audio, video, and data streams are separated using the PID. In addition, the packet identifier allocation / release module releases the usage information of the used PID when receiving the application stop information so that the corresponding PID can be used again later.

The transmission bit rate setting unit 1005 sets the transmission bit rate of the application in data encoder setting. Here, the total transmission bit rate is a dynamic conversion of the transmission bit rate of each application when the application is added or reduced.

[Equation 1]

As in Equation 1, the transmission bit rate is calculated by calculating the amount of data transmitted with respect to the time taken to perform data transmission. Data transmission is performed when the above conditions are met, and the transmission bit rate is calculated by dividing the amount of the transmitted bit stream by the time required. If the sum of the transmission bit rates of the streams exceeds the total bit rate set in the data encoder setting, the data transmission is temporarily stopped. If the sum of the transmission bit rates of the streams is less than the total bit rate, the transmission is continuously attempted so that the transmission is performed at the set bit rate. do.

The transmission bit rate for each application is determined at the beginning of the application transmission. First, after receiving the data to be encoded together with the start command for a new application, the output bit rate is determined by a proportional relationship between the total capacity of the currently transmitting application and the capacity of the new data to be transmitted. Can be guaranteed to be received.

According to Equation 1, a transmission bit rate of an application for which new transmission is started is primarily determined. In addition, the application transmission weight by the data broadcasting operator is received at the start of the application. Items that should be received prior to other applications during broadcast operation may be transmitted by setting a higher weighting factor.

Bit rate reset by weight is calculated by Equation 2.

[Equation 2]

For example, content such as real-time news, breaking news, quizzes, product orders, etc. have a higher importance than other applications, and weather forecasts, recurring news, program programming, etc. have a relatively low importance, so the weight according to the importance is tactical It can be stored in the application table along with one application distinguishing key.

The object carousel encoder 1006 encodes application data to be transmitted into an object carousel. Since a plurality of applications are transmitted, the encoding operation of the new application performs an encoding operation by creating a separate thread in the object carousel encoding block so as not to affect the operation of an already transmitting application when the new application is encoded.

The object carousel encoder 1006 generates an OC sender thread 1007 for the operation of periodically packetizing the generated result into a transport stream packet and periodically generating the object carousel stream. Repeated transmission is performed.

The object carousel transmitter 1008 repeatedly transmits the object carousel using the generated transmission thread 1007. In this case, while the transmission thread performs repeated transmission of the object carousel, when the configuration of the corresponding application is changed, a new transmission thread is generated and updated. When the transport thread is generated, the transmission of the stream of the object carousel that is being transmitted is stopped and the transmission of the newly constructed stream is started.

To this end, the transmission state monitoring unit 1009 monitors the change of the application being transmitted or the termination of the application being transmitted and notifies the control command reception queue 1002. The control command reception queue 1002 receives application transmission change information from the transmission state monitoring unit 1009 and the transmission manager 530, and transmits the application transmission change information to the application registration unit 1003 and the packet identifier allocation / release module 1004. Change the information in the chain and allow the transmission bit rate to be adjusted in a chain.

According to the above-described configuration, when a new application is registered, the data broadcasting system dynamically allocates bandwidth by dynamically managing the number of applications currently being transmitted , their respective sizes, and their importance . An object carousel transmission thread may be generated and transmitted as a broadcast stream.

5 is a flowchart illustrating a data transmission method according to an embodiment of the present invention.

Prior to data transmission, in step S100, the total transmission rate for the application is calculated. The total data rate for the data corresponding to the application is determined based on the data rate assigned to the data broadcast in the transport stream.

When the data transmission block starts, a transmission thread is generated according to the number, size, and importance of applications currently being transmitted (S110 and S120). Here, the transmission thread is set to output data at a bit rate set based on the allocated transmission bit rate, the free capacity of the output buffer, and the data size of the input buffer considered in the following steps.

In step S130, it is determined whether the transmission is stopped because the transmission is completed for the currently transmitted application, and when it is stopped, the thread is terminated and a new thread is generated (S130 and S190).

On the other hand, during transmission, it is determined sequentially whether the transmission bit rate is exceeded, the size of the output buffer or the input buffer is empty, and if there is no error, the object carousel is repeatedly transmitted according to the transmission thread (S170). ).

However, when the transmission bit rate is exceeded or the capacity of the output buffer is exceeded, or when the capacity of the current input buffer is sufficient, the transmission bit rate is calculated as in Equation 1 or Equation 2.

That is, the transmission bit rate is dynamically determined according to the number and size of applications to be transmitted and the importance of the application .

Hereinafter, when a plurality of applications are transmitted, a variable bandwidth allocation method will be described in detail.

6 is a flowchart illustrating a method of dynamically allocating and transmitting bandwidth for multiple applications according to an embodiment of the present invention.

When the start information of the application is transmitted from the delivery manager, the application is registered based on a division key for uniquely distinguishing the application from the start meta information of the application (S200).

The distinguishing key of the application is an identifier of an organization producing the application, an identifier for identifying an application in a currently configured data stream, an application string value, an application string, and a registration in a database in a transmission system. Contains an identifier (Content ID) that identifies.

On the other hand, when receiving the start information about the application from the delivery manager, it is determined whether the corresponding Content ID and Application name is already being transmitted (S210, S211). If the application is already being transmitted, it is switched to a state of waiting for a control message generated according to the addition of a new application or the completion of the application transmission (S300).

If it is determined in step S210 and S211 that a new application is generated, an object carousel encoder for repetitive transmission is generated and the object carousel encoder corresponding to the newly started application is added to the object carousel encoder list (S220 and S230). In the embodiment of the present invention, since a plurality of applications are transmitted, the encoding operation of the new application generates a separate thread in the object carousel encoding block so that when the new application is encoded, the encoding operation of the new application is not affected. To perform the encoding operation.

When the object carousel encoder is generated, the application is configured as an object carousel stream so as to be suitable for the encoder (S240).

Meanwhile, in step S250, when the data encoder start information is received from the delivery manager, the PID range of the data stream to be encoded by the data encoder is allocated. When receiving application start information, one PID is used in the designated range and the usage information for the PID is recorded. The PID is used to separate data divided into one application in a demultiplexing process in a broadcast receiver.

On the other hand, when application suspension information is received from the delivery manager or the control message queue, it is determined whether the corresponding application is currently being transmitted (S201, S212, S213).

If it is determined that the application receiving the stop information is currently being transmitted, the object carousel encoder for the corresponding application is deleted from the list, and the object carousel transmission thread generated for object carousel transmission is terminated (S221, S231, S241).

When the object carousel transmission thread is terminated, the PID for the corresponding application is released (S251). The released PID can be reused when another application is sent.

When the PID is allocated or the PID is released, bandwidth allocation for the application is performed (S260). As described above, after allocating the application total transmission bit rate in the data encoder setting, bandwidth allocation transmits the application within the total transmission bit rate. When an application is added, one application is readjusted to the bit rate to be transmitted by dividing the total transmission bit rate by the number of applications being transmitted.

When an application is added, the transmission bit rate of the previously transmitting application is reduced. When the application is stopped, the transmission bit rate of the remaining applications is increased.

In addition, when the function of guaranteeing the same reception time is turned on, the size (capacity) of each application is measured and an appropriate bit rate is assigned to each application (see [Equation 1]).

In addition, a weight is assigned according to the importance of the application, and a transmission bit rate is allocated in proportion to the weight of the corresponding application for the total sum of the weights.

In step S261, an AIT_table for the information of the application being transmitted is constructed. The table is performed by the AIT management unit. The application receiving the start information is added to the AIT table, and the application receiving the stop information is deleted from the AIT table. On the other hand, the AIT matches the start separator key and the importance for the application and stores them together.

In step S262, stream information including an object carousel stream, an AIT stream, and a stream event (STE) section for the application that received the start information is transmitted to the PSIP encoder.

Here, in order to repeatedly transmit the packetized transport stream packet, an object carousel transmission thread is generated, and the object carousel is streamed and transmitted according to the thread (S270 and S280).

In step S290, while the stream is being transmitted, the transmission status is monitored to monitor the start / stop of the application and the change of service contents.

When the control message for the start / stop of the application and the change of the service contents occurs during the monitoring, it is received in the control message reception queue and returns to step S200 or step S201 to perform dynamic bandwidth allocation.

As described above, when one application is encoded into the object carousel and transmission is started, the object carousel configuration information should be updated to reflect the change in the service contents provided by the application in the future.

The object carousel encoder performs the carousel repetitive transmission operation and observes whether the control command is received in the control command reception queue. When receiving the dynamic update control command, the object carousel encoder sends the received information as an event to the coding block in charge of configuring the application. Inform.

When receiving the dynamic update control command from the object carousel coding block, an operation of newly constructing the entire hierarchy based on the update information and encoding the changed data is received. When all object carousel update processes are completed, the repeated transmission thread is notified again that the update process is completed, and the newly encoded object carousel stream position information is notified. The repetitive transmission thread stops the transmission of the object carousel stream, which is being transmitted, and starts the transmission of the newly constructed stream.

The data encoder generates certain events according to the application configuration to transmit, enabling dynamic operation of the application. Such an event is defined as an object as a stream event in the 13818-6 DSM-CC standard specification, and the encoding standard is transmitted by using the (Descriptor Section method).

On the other hand, the data stream to which the stream event (STE) is transmitted is repeatedly transmitted independently of the object carousel stream by receiving a separate PID.

The process of repeatedly transmitting the data stream of the stream event is slightly different from that of the object carousel stream. Stream event data has no individual bit rate setting in the data encoder's configuration. This is because the stream event data may be transmitted depending on the type of application, but there is an application that is transmitted without the stream event, so that a certain amount of bandwidth is prevented from being allocated for the stream event that is not transmitted.

The stream event is a function defined in the object carousel encoding method, which is a data broadcast protocol. For example, an application that has been transmitted once can be dynamically configured to update the contents of the files constituting the application and to display the information to the user.

Here, there are two dynamic configuration methods, one of which is Object Carousel Update, and the other is Stream Event Transmission.

The object carousel update changes the contents of the application (text, img), etc., and then encodes the object carousel and transmits the encoded object to carousel again. However, since the carousel has to be reconfigured and the transmission period is large, it can be applied to the receiver to react. It takes time.

In contrast, stream events send additional data of a relatively small size. For example, a stream event is used when it is actually promised that "1 is what the application will do when data comes in." Therefore, the stream event uses a different PID from the object carousel, and is used for an operation that expects a faster user response than the object carousel update because it is repeatedly transmitted with a short period.

Therefore, when using the stream event in the configuration of the application, the data encoder is transmitted by sharing the allocated bandwidth of the object carousel stream to which the application is transmitted after encoding the event data and TS packetized at the event occurrence time. For example, when one application is allocated a transmission bandwidth of 300 KBps, when only the object carousel stream is transmitted, the entire band is used to transmit the object carousel stream. However, when a stream event is transmitted, the bandwidth of the object carousel stream is used. Since a certain bandwidth is used for the stream event transmission, the object carousel stream is transmitted using the remaining bandwidth except the bandwidth required for the stream event transmission.

At this time, a dynamic allocation method is also required in the transmission bit rate allocation for transmission of each object carousel stream and stream event. Before the event occurs, the object carousel is transmitted using the entire application transmission bandwidth, but after the event occurs, the bandwidth is reduced by a certain amount so that it can be used for stream event transmission. On the contrary, when the event transmission is stopped, the transmission bandwidth allocated for the stream event transmission is reduced so that all of the object carousel transmission can be used.

Therefore, the dynamic allocation of the transmission bit rate to the above-described stream event will also be included in the scope of bandwidth allocation described by the embodiment of the present invention.

Here, a program for realizing a function corresponding to the configuration of the above-described embodiment of the present invention or a recording medium on which the program is recorded is also included in the scope of the present invention.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

According to the above configuration, the present invention can variably change the transmission bit rate of each application constituting the service at the time when the broadcast service is newly configured.

Accordingly, the idle bandwidth is generated in the fixed bit rate transmission scheme, and the bandwidth allocated to data broadcasting can be maximized.

In addition, from a broadcast operator's point of view, when each content constituting the data broadcast service has the same transmission importance, it can be ensured that the receiver can receive each content at the same time. In addition, in the data broadcasting service configuration, contents to be first received by the receiver may be set to a higher transmission importance so that they can be received more preferentially by the receiver. Therefore, the content of the data broadcast service is primarily driven by the broadcast receiver, and content requiring a large amount of data is received by the user by receiving the content at the same time as the main service is started after the main service is started. The response speed of broadcasting service can be improved.

Claims (10)

A data broadcasting method using variable bandwidth allocation, a) receiving application start information and registering an application; b) determining whether the application is currently being transmitted based on the application start information; c) generating an object carousel stream by allocating bandwidth according to a ratio of the application to at least one of the number of applications transmitted, the size of the application, and the importance of the application if the application is not currently being transmitted; d) transmitting the object carousel stream according to the allocated bandwidth Data broadcasting method comprising a. The method of claim 1, e) monitoring the transmission status of the object carousel stream; f) receiving and registering application suspension information; g) determining whether an application corresponding to the application suspension information is being transmitted; h) If an application corresponding to the application suspension information is currently being transmitted, the encoder is stopped for the application that has received the suspension information, and the ratio of the application to at least one of the number of changed applications, the size of the application, and the importance of the application; And reallocating the bandwidth according to the data broadcasting method. The method of claim 1, Step b) is a data broadcasting method for determining the transmission status of the application using the application identification key included in the application start information. delete The method of claim 2, Configuring an AIT table for the application, encoding the same, and transmitting the encoded information in a stream. The method of claim 2, In step h), the data broadcasting method further performs bandwidth allocation by using an idle bandwidth allocated to the suspended application. The method of claim 5, And when the application uses the stream event, adjusts the bandwidth of another application to allocate bandwidth for the stream event at the event occurrence time. In a data broadcasting system performing variable bandwidth allocation, An application registration unit for updating the registration information of the application in response to the application start / stop information received from the dispatch manager and the control message reception queue; A transmission bit rate setting unit for allocating a bandwidth according to a ratio of a current application to at least one of the number, size, and importance of all applications in a bandwidth corresponding to a predetermined total data rate for data broadcasting according to the application information registered in the application; An object carousel encoder for encoding the application data to be repeatedly transmitted; An object carousel transmitter for transmitting the encoded object carousel; And Transmission status monitoring unit for monitoring the termination and change of the application being transmitted to notify the control message receiving queue of the termination and change information Data broadcasting system comprising a. The method of claim 8, And a packet identifier allocation / control module for allocating a packet identifier for the new application and retrieving the terminated packet identifier. The method of claim 8, And the object carousel transmission unit generates a new object carousel transmission thread as the information of the application registration unit is changed.

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