KR100710330B1 - A multi media broadcasting system and a multi media broadcasting channel management method - Google Patents

Abstract

In a multimedia broadcasting system comprising a multimedia broadcasting center for transmitting multimedia broadcasting data and a multimedia broadcasting terminal for receiving the multimedia broadcasting data and implementing a multimedia playback function, the multimedia broadcasting center in a service area boundary is a service area boundary. Information is transmitted using TII (Transmitter Identification Information) transmitted through a Synchronization Channel, and the multimedia broadcasting terminal detects and borders a service area boundary through TII (Transmitter Identification Information) included in a received data frame. In the case of a region, a multimedia broadcasting system and a broadcasting channel information providing method using the same, characterized in that for receiving the frequency information (Frequency Information) of the other region to update the channel information.

DMB, TII, FI, Main ID

Description

A multi media broadcasting system and a multi media broadcasting channel management method}

1 is a block diagram illustrating a general DMB receiver.

Figure 2 is an exemplary view showing the structure of a transmission frame defined in Eureka-147.

3 is an exemplary view showing a detailed structure of each FIB of FIG.

4 is an exemplary diagram showing the distribution of a service area in the form of a cell.

5 is an exemplary view showing the structure of TII according to the present invention.

6 is a flowchart illustrating a procedure of a method for providing multimedia broadcast channel information according to an embodiment of the present invention.

7 is a flowchart illustrating a procedure of a method for providing multimedia broadcast channel information according to another embodiment of the present invention.

8 is a flowchart illustrating a procedure of a method for providing multimedia broadcast channel information according to another embodiment of the present invention.

The present invention relates to a terminal for receiving a multimedia broadcast and a method for providing broadcast channel information. More particularly, when a change in a service area of a receiver occurs in a multi frequency network, an automatic channel function can be supported. A broadcast system and a method of providing broadcast channel information are provided.

Recently, as digital audio devices with excellent sound quality such as CD and DVD have been rapidly spread and popularized, the demand for listeners for digital broadcasts requiring high quality sound is increasing day by day, and thus the limitation of sound quality that existing FM broadcast can provide To overcome this, Digital Audio Broadcasting (DAB) is being implemented in Europe, Canada and the United States. The DAB system uses a technology completely different from the current AM or FM broadcast to show not only high quality sound quality but also excellent reception performance on the go, and has a characteristic of transmitting digital data such as video and text at high speed. have. Recently, various multimedia services including video rather than audio broadcasting are emphasized and called digital multimedia broadcasting (DMB).

On the other hand, Moving Picture Experts Group (MPEG-4) has been developed for the purpose of mobile reception to ensure high quality program reception in fixed and mobile reception environments, while simultaneously providing mobile terminals (e.g., vehicle terminals, mobile phones, PDAs). It can be delivered through, and can serve as a medium for providing personal mobile broadcasting service. That is, when the mobile terminal is equipped with a DMB receiver or a DMB receiving pack, the mobile terminal can receive and decode the MPEG-4 encoded video and display the same. Then, the user can be provided with various multimedia services through a mobile phone or a PDA.

The MPEG-4 method deviates from the block-based transform coding method used in the H.261 standard, the JPEG standard, and the MPEG-1 and MPEG-2 standards, and generates an image signal based on the contents of the image. Encode That is, the MPEG-4 method uses a content representation method based on content, and processes the screen into video objects having attributes of shape information, motion information, and texture information. The content-based image presentation method establishes the interrelationships between objects in various multimedia applications to facilitate their access and manipulation. In other words, the object-oriented interactive function in MPEG-4 handles object elements of pictures or sounds independently in multimedia data access, and combines them by linking with each other, allowing the user to freely configure the pictures or sounds. For example, processing such as replacing only the main character with the background on the screen previously possible only in the production stage, but in the MPEG-4 user stage.

That is, in the domestic standardization of the DMB service, the multimedia of the transmitting side is compressed and encoded in the MPEG-4 system in consideration of the scalability for various data services, and then transmitted along with the meta information to the MPEG-2 system. In the 2 system, the method of packetizing the input MPEG-4 data in the form of PES and then in the form of MPEG-2 TS (transport) is transmitted through the Eureka-147 system. Here, the Eureka-147 system uses an orthogonal frequency division multiplexing (OFDM) transmission scheme with time / frequency interleaving and error correction coding to overcome fading distortion caused by a transmission channel. In other words, in the case of the DMB service, multiplexing and synchronization for transmission of A / V broadcasting follows the MPEG-2 TS standard using the MPEG-2 system, and the additional data broadcasting except the A / V broadcasting is an MPEG-4 system. Use

1 is a block diagram schematically illustrating a DMB receiver for receiving such a mobile multimedia broadcast. The Eureka-147 receiver 101 receives a DMB broadcast signal transmitted by an OFDM transmission method and performs a fast fourier transform (FFT). Inversely, the interleaving is performed in the time and frequency domain and output to the MPEG-2 TS processor 102. The MPEG-2 TS processor 102 separates and decodes the A / V signal from the multiplexed signal with reference to the PAT, PMT, etc., and the MPEG-4 reconstructor 103 decodes the additional data and displays it on the screen. At this time, the control of the Eureka-147 receiving unit 101 is performed according to the FIC information.

As such, the multimedia data in the mobile TV service is transmitted based on Eureka-147 [ETSI EN 300 401], the European standard method of digital audio broadcasting (DAB), and the multiplexing and synchronization of programs is carried out by the Moving Picture Experts Group (MPEG). A transport stream (TS) of -2 [ISO / IEC 13818-1] is used. Information required for program configuration in the MPEG-2 is transmitted through a program association section (PAT) and a transport stream program map section (PMT).

In the Eureka-147, important information is transmitted through a fast information channel (FIC), which is standardized to transmit a program configuration and the like. The feature of the FIC is that time interleaving is not performed, so that necessary information can be obtained within a faster access time, and used to transmit structural data such as service information.

2 illustrates a structure of a DMB transmission frame used in Eureka-147, and includes a synchronization channel, a high speed information channel (FIC), and a main service channel (MSC). Each FIC is composed of Fast Information Blocks (FIBs), and each MSC is composed of Common Interleaved Frames (CIFs). The smallest unit that can be assigned an address in the CIF is a capacity unit (CU), and one CU is 64-bit. A plurality of CUs are connected to form one subchannel, and the MSC may be referred to as a multiplex structure of these subchannels. In order to transmit the service component of the MSC, two data transmission modes, a stream mode and a packet mode, are supported. The stream mode provides transparent transmission at a fixed bit rate using one subchannel designated from the information source to the destination. The packet mode can deliver several data service components in one subchannel. Most data services other than SI use MSC.

At this time, the number of FIB and CIF to enter each FIC and MSC is determined according to the transmission mode. 3 illustrates a detailed configuration of the FIB, and each of the fast information blocks (FIBs) is composed of a plurality of FIG (Fast Information Groups). One FIB is composed of 256 bits, of which data can enter 240 bits, or 30 bytes. FIG entered in the FIB is divided into a FIG header and a FIG data field. Therefore, the length of FIG may not exceed 30 bytes including a header.

In Eureka-147, which is currently used in Europe, FIG uses five of the eight available types. Each FIG type can be extended by type. For example, in case of type 0 of FIG, 32 kinds of extensions are possible, and the extensions used among them use 30 extensions. Each of them is used for configuration information of an ensemble, contents of a subchannel, and paging.

In such a multimedia broadcasting system, when a change of a service area of a receiver occurs in a multi frequency network, in order to support the automatic channel function, the current service area must be recognized using all frequency information of the entire service area. do. Therefore, a frequency search delay occurs and rapid service restart is impossible.

As shown in FIG. 4, when the service area is divided, the terminal located in the FA4 area of the service area A must perform channel search for FA2, FA7, and FA6 of another service area B. In addition, the UE located in the area FA7 of the service area B performs channel search on the FA1, FA3, FA4, and FA5 of the other service area A. Therefore, unnecessary time is required for channel searching. That is, in general, when the user cannot receive the multimedia broadcast, the user performs the automatic channel search and causes the inconvenience of pausing the multimedia broadcast reception.

An object of the present invention is to provide a multimedia broadcasting system and a channel information providing method capable of automatically providing channel information in response to a change in a service area.

Another object of the present invention is to alleviate the inconvenience of performing a channel search whenever the service area changes as the user of the multimedia broadcasting terminal moves.

In accordance with an aspect of the present invention, there is provided a method for providing multimedia broadcasting channel information by using a TII (Transmitter Identification Information) transmitted through a synchronization channel in a multi-frequency network. And provide frequency information of a new area.

A detailed feature of the method for providing multimedia broadcasting channel information according to the present invention is that provision of the frequency information of the new region is performed automatically or manually through a pop-up message displayed on the display window of the terminal.

Another detailed feature of the method for providing multimedia broadcasting channel information according to the present invention is that frequency information of the new region is provided using FIG. 0 extension 21 (FIG 0/21).

Another detailed feature of the method for providing multimedia broadcasting channel information according to the present invention is that the service area boundary information is provided through the Main Id field of the TII.

Another detailed feature of the method for providing multimedia broadcasting channel information according to the present invention is that the Main Id field represents an inter_flag representing a boundary region with a value of 1 bit and a transmitter ID with a value of 6 bits.

According to another aspect of the present invention, there is provided a method of providing multimedia broadcasting channel information, comprising: extracting a main ID field of a TII included in a synchronization channel of a received digital broadcasting data frame; Receiving frequency information of a border area if a value included in the inter_flag field of the Main Id field indicates a value indicating a service area border area; And parsing the received frequency information to store and update channel information of another broadcasting station in a storage device.

According to an aspect of the present invention, there is provided a multimedia broadcasting system including a multimedia broadcasting center for transmitting multimedia broadcasting data, and a multimedia broadcasting terminal for receiving multimedia broadcasting data to implement a multimedia playback function. Multimedia broadcasting center transmits service area boundary information using transmitter identification information (TII) transmitted through a synchronization channel, and the multimedia broadcasting terminal transmits transmitter identification information (TII) included in a received data frame. When the service area boundary is detected through the bordered area, frequency information of the other area is received and the channel information is updated.

The multimedia broadcasting terminal according to the present invention comprises a memory for storing channel information; It extracts Transmitter Identification Information (TII) included in the received data frame, detects service area boundary, and receives frequency information of other area in case of bordered area and outputs control signal for updating channel information. It is characterized by a configuration including a control unit.

Other objects, features and advantages of the present invention will become apparent from the detailed description of the embodiments with reference to the accompanying drawings. Hereinafter, with reference to the accompanying drawings illustrating the configuration and operation of the embodiment of the present invention, the configuration and operation of the present invention shown in the drawings and described by it will be described by at least one embodiment, By the technical spirit of the present invention described above and its core configuration and operation is not limited.

5 is an exemplary diagram illustrating a structure of a transmitter identification information (TII) according to the present invention. The TII is carried on a synchronization channel. This is provided for accurate identification of each transmitter in the DAB network. Application of TII is optional.

As defined in the DAB standard subclause 8.1.9, when used with Service Information, it provides an estimate of the location of the geostationary position of the receiver. In particular, TII is used together with frequency information (FI) in a single frequency network (SFN).

As shown, the main ID field (Main ID) of the field configuring the TII has a value of 7 bits. 64 of them are already set. The present invention uses the value of the area not used otherwise. That is, a 7-bit Main ID field represents a 1-bit value representing inter_flag, which means a border region, and a 6-bit value represents a Transmitter ID.

6 is a flowchart illustrating a procedure of a method for providing multimedia broadcast channel information according to an embodiment of the present invention. The terminal receiving the data frame transmitted from the broadcasting center extracts the TII, especially the Main ID field, included in the synchronization channel (S61).

The inter_flag value of the Main ID is checked (S62).

When inter_flag of Main ID is "1", it indicates that the user is located in the current border area. Therefore, parsing information of FIG type 0 extension 21 of the Eureka-147 standard FIC received from the adjacent broadcasting center is detected to detect frequency information of another region. That is, when moving from the area FA4 of FIG. 4 to the area FA1, frequency information provided from adjacent broadcast centers FA2, FA7, and FA6 belonging to the service area A and the other service area B of the FA1 is detected. (S63).

Then, the detected frequency information is stored in the storage device in the terminal. Preferably, the memory device uses a nonvolatile recording memory such as a flash ROM (S64).

7 is a flowchart illustrating a procedure of a method for providing multimedia broadcast channel information according to another embodiment of the present invention. It is a case of crossing the border while listening to digital multimedia broadcasting. If the user passes the border area in the situation (S71, S72) that the reception is finished by the user's intention, the user does not recognize this. Therefore, when the user attempts to listen to the DMB broadcast again, since the previously stored channel information is used, the reception quality may be degraded or the channel being listened to may be lost. Therefore, when located in the bordered area (S73), a pop-up message for notifying that a new channel search is required according to the location of the bordered area is output through the display device of the terminal (S74).

When the user presses a predetermined button for channel search (S75), the data frame of FIG type 0 extended 21 received from the adjacent broadcasting center is parsed to detect frequency information of another region (S76). The stored frequency information in a storage device in the terminal (S77).

8 is a flowchart illustrating a procedure of a method for providing multimedia broadcast channel information according to another embodiment of the present invention. Unlike the embodiment of FIG. 7, it is determined whether the electric field strength of the multimedia broadcast signal received during DMB listening is smaller than the threshold (S81 and S82). If it is smaller than the threshold, pop-up messages are displayed as in the example of FIG. 7 to inform the user of the necessity of channel search (S83). When the user selects a channel search (S84), the data frame of FIG type 0 extended 21 received from the adjacent broadcasting center is parsed to detect frequency information of another region (S85), and the detected frequency information is detected. In the storage device in the terminal (S86).

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

As described above, the multimedia broadcasting system and the method for providing channel information according to the present invention can automatically provide channel information in response to a change in the service area, and the service area is changed as the user of the multimedia broadcasting terminal moves. Each time, the inconvenience of having to perform a channel search can be eliminated.

Claims (18)

delete The multimedia broadcasting channel is characterized by indicating a service area boundary using TII (Transmitter Identification Information) transmitted through a synchronization channel in a multi frequency network, and automatically providing frequency information of a new area. How to Provide Information. The method of claim 2, wherein the new frequency information is provided through a pop-up message displayed on a display window of the terminal. 3. The method of claim 2, wherein the new frequency information is provided using FIG. 0 extension 21 (FIG 0/21). The method according to any one of claims 2 to 4, wherein a service area boundary is indicated through a Main Id field of the transmitter identification information (TII). 6. The method of claim 5, wherein the Main Id field represents an inter_flag representing a boundary region with a value of 1 bit and represents a Transmitter ID with a value of 6 bits. Extracting a Main ID field of a TII included in a synchronization channel of a received digital broadcast data frame; Receiving frequency information of a border area if a value included in the inter_flag field of the Main Id field indicates a value indicating a service area border area; And parsing the received frequency information to store and update channel information of another broadcasting station in a storage device. 10. The method of claim 7, wherein the Main Id field represents an inter_flag representing a border region with a value of 1 bit and represents a Transmitter ID with a value of 6 bits. 10. The method of claim 7, wherein frequency information of the border region is provided using FIG. 0 extension 21 (FIG 0/21). 8. The method of claim 7, wherein a process of outputting a pop-up message informing a user whether to search for a channel in a state where a value indicating the bordered area is received is added. In a multimedia broadcasting system comprising a multimedia broadcasting center for transmitting multimedia broadcasting data, and a multimedia broadcasting terminal for receiving the multimedia broadcasting data and implementing a multimedia playing function, The multimedia broadcasting center in the service area boundary area transmits service area boundary information using TII (Transmitter Identification Information) transmitted through a synchronization channel, The multimedia broadcasting terminal detects a service area boundary through TII (Transmitter Identification Information) included in the received data frame, and updates the channel information by receiving frequency information of another area in the border area. Multimedia broadcasting system. 12. The multimedia broadcasting system according to claim 11, wherein the multimedia broadcasting center indicates a service area boundary through a main id field of the TII. The multimedia broadcasting system according to claim 12, wherein the Main Id field represents an inter_flag representing a border region with a value of 1 bit and a transmitter ID with a value of 6 bits. 13. The multimedia broadcasting system of claim 12, wherein frequency information of the other region is provided using FIG. 0 extension 21 (FIG 0/21). A multimedia broadcasting terminal for receiving multimedia data from a multimedia broadcasting center for transmitting multimedia broadcasting data to implement a multimedia playback function. A memory for storing channel information; It extracts Transmitter Identification Information (TII) included in the received data frame, detects service area boundary, and receives frequency information of other area in case of bordered area and outputs control signal for updating channel information. Multimedia broadcasting terminal comprising a control unit. 16. The terminal of claim 15, wherein a service zone boundary is indicated through the Main Id field of the TII. The terminal of claim 15, wherein the terminal determines whether a service area boundary exists by checking inter_flag of the Main Id field. 16. The multimedia broadcasting terminal as claimed in claim 15, wherein frequency information of the other region is received through a fast information channel (FIC) of FIG. 21 (FIG 0/21).

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