KR20120123638A - Method and apparatus for transimitting/receiving signalling information for receiving a braoadcast service in a digital broadcast system - Google Patents

Abstract

PURPOSE: A method and an apparatus for transceiving signaling information are provided to efficiently transceive signaling information for receiving a broadcasting service. CONSTITUTION: An SGDD generation and transmission unit(302) transmits SGDD through a transmission network. A control unit generates signaling information. The control unit configures the SGDD in order to including the signaling information. The signaling information is used when receiving information for receiving a broadcasting service in a lower layer of an IP layer. The signaling information includes layer 2 signaling information. [Reference numerals] (301) NGH signaling information generation unit; (302) SGDD generation and transmission unit; (303) Transfer network; (304) Mobile broadcasting terminal

Description

METHOD AND APPARATUS FOR TRANSIMITTING / RECEIVING SIGNALLING INFORMATION FOR RECEIVING A BRAOADCAST SERVICE IN A DIGITAL BROADCAST SYSTEM}

The present invention relates to a method and apparatus for receiving a broadcast service in a digital broadcast system, and more particularly, to a method and apparatus for providing signaling information for reception of a broadcast service in a digital broadcast system.

Due to the development of communication and broadcasting technology, the portable broadcasting service that provides the broadcasting service to the portable terminal in the conventional broadcasting system or the mobile communication system has been created by the second generation portable broadcasting standards with full-scale standardization and commercial service since the mid-2000s. One example of the second generation standard broadcast is Next Generation Handheld (NGH), which is being standardized by Digital Video Broadcasting (DVB), a European digital broadcasting standard organization. The NGH has an IP profile for interworking with a Moving Picture Experts Group 2 (MPEG2) TS (Transport Stream) profile and an IP (Internet Protocol) for maximizing the terrestrial broadcasting network. The MPEG2 TS profile provides service information and network information on which the service is transmitted using PSI / SI (Program Specific Information / Service Information) provided by the TS. Since the IP profile does not use MPEG2 TS, service information and network information on which the service is transmitted must be provided by using a separate method. Therefore, a method for efficiently providing signaling information of the DVB NGH IP profile is required.

The present invention provides a method and apparatus for efficiently transmitting and receiving signaling information for receiving a broadcast service in a digital broadcasting system.

The present invention also provides a method and apparatus for transmitting and receiving signaling information for receiving a broadcast service in a digital broadcasting system using a service guide delivery interpreter.

The present invention also provides a method and apparatus for efficiently transmitting and receiving signaling information for receiving information in a lower layer of the IP layer in the DVB-NGH IP profile.

According to an embodiment of the present invention, a method of transmitting signaling information in a digital broadcasting system includes generating signaling information used when receiving information for receiving a broadcast service in a lower layer of an IP layer, and including the signaling information. And configuring a service guide delivery analyzer (SGDD), and transmitting the SGDD including the signaling information through a transmission network of a broadcast service.

In addition, according to an embodiment of the present invention, a transmission apparatus for transmitting signaling information in a digital broadcasting system includes a transmitter for transmitting a service guide delivery analyzer (SGDD) through a transmission network of a broadcast service, and a broadcast service in a lower layer of an IP layer. And a controller configured to generate signaling information used when receiving information for reception and to configure the SGDD to include the signaling information.

According to the embodiment of the present invention, an apparatus and method for efficiently providing NGH signaling information through SGDD of the OMA BCAST Service Guide can be provided.

In addition, according to the present invention, in transmitting the NGH signaling information to the SGDD, a device capable of using PrivateExt that can be compatible with the existing BCAST SG, and a device capable of using BDSSpecificEnrtyInfo that can provide information on a specific portable broadcasting system. And methods.

In addition, according to the present invention, it is possible to provide a method for the terminal to efficiently receive the NGH signaling information by providing a transmission period and version of the NGH signaling information transmitted through the SGDD.

In addition, according to the present invention, the signaling information in the lower layer of the IP layer in the DVB-NGH IP profile can be provided to the terminal through SGDD to reduce the delay time until the terminal acquires the signaling information.

1 is a view showing a service guide structure of OMA BCAST,
2 is a diagram for explaining a higher layer signaling structure of DVB-NGH;
3 is a diagram illustrating a configuration of a transmitter for generating and transmitting an SGDD proposed in an embodiment of the present invention;
4 is a diagram illustrating a configuration of a receiving apparatus for receiving SGDD proposed in an embodiment of the present invention;
5 is a flowchart illustrating a process of generating signaling information in the transmitting apparatus of FIG. 3;
6 is a flowchart illustrating a process of receiving signaling information in the receiving device of FIG. 4.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

Hereinafter, embodiments of the present invention will be described using DVB-NGH and OMA BAC BCAST (Open Mobile Alliance Browser and Content Mobile Broadcast) technology, which is a portable broadcasting standard, among the broadcasting technologies to which the present invention can be applied. It does not limit the content of the invention.

1 is a diagram illustrating a general structure of a service guide proposed for portable broadcasting by the OMA BCAST (Open Mobile Alliance Mobile Broadcast Service Working Group).

One service guide is composed of fragments for each purpose, and each fragment is divided into four large groups according to the purpose of use.

Referring to FIG. 1, the service guide includes four groups of 100 administrative groups, 110 provisioning groups, 120 core groups, and 130 access groups.

The 100 administrative group is a group for providing basic information for receiving a service guide and includes 101 service guide delivery descriptors. The 101 service guide delivery descriptor informs the terminal of channels, schedule information, and update information capable of receiving a plurality of service guide fragments, and provides information for allowing the terminal to receive only the necessary service guide at a suitable time.

The 110 provisioning group is a group providing fee information for receiving a service and includes 111 purchase item, 112 purchase data, and 113 purchase channel. 111 Purchase Item provides price information about the service or bundle of services. 112 Purchase data provides information on how the service user can pay for the service. 113 Purchase channel provides the service user with the actual service. Provides information about the systems available for purchase.

The 120 core group is a group for providing information on the service itself, and includes 121 service, 122 schedule, and 123 content. 121 service provides a description of the service itself that the user will receive and information about what content the service is made up of, and 122 schedule provides information about when the service is available and available, and 123 Content Provides information about a plurality of contents constituting the service.

The 130 access group includes 131 access and 132 session description. The 130 access group includes service access information on how to receive services of the 120 Core group and contents constituting the service. The terminal provides specific information on the transmitted session to enable the terminal to access the service. 131 Access provides a terminal with a number of access methods for a service, thereby providing a method for accessing a variety of additional services based on a service. 132 Session Description provides Session information about service transmitted by service Access defined in one Access Fragment.

In addition to the four groups, there are 124 preview data fragments and 125 interactive data fragments. The 124 preview fragment provides previews and icons for services and content, and the 125 Interactive data fragment serves to provide information about an interactive service that a user can participate while using a broadcast service.

FIG. 2 is a diagram illustrating an example of a protocol of an NGH defined in a general DVB-NGH. Referring to FIG. 2, an upper layer signaling structure of the DVB-NGH will be described.

Referring to FIG. 2, 201 DVB-NGH is a layer for transmitting a bitstream using an appropriate modulation scheme as a physical layer of NGH and transmits 202 Layer 1 signaling. 202 Layer 1 signaling provides information required in a physical layer such as information on which a terminal can find a DVB-NGH network. 203 Baseband (BB) frame is a frame used in the upper layer of the physical layer, the data transferred from the upper layer is composed of a BB frame through a formalization process in the 204 Encapsulation layer. 205 is an Internet protocol (IP) layer. In FIG. 2, 209 service data, 208 Upper Layer information (ULI), 207 Local Multiplex information, and 206 Other Multiplex information (OMI) are described. Signaling information is transmitted in an upper layer of the IP layer.

Here, signaling information such as 206 OMI, 207 LMI, and 208 ULI is used to receive information in a lower layer of the 205 IP layer.

The 206 OMI informs network identification information and frequency information of the DVB-NGH through which the 209 service data is transmitted, and the 207 LMI indicates an NGH logical link pipe (LPL) and an NGH physical link pipe (Physical). Link pipe, PLP) and LLP buffer model information, and the ULI of 208 provides service related information such as BCAST Service Guide and LLP, PLP, etc. to which a service is transmitted. Provides connection information.

The service connection information of the 206 OMI, 207 LMI, and 208 ULI is similar to the information transmitted through the PSI / SI of the MPEG 2 TS in the conventional MPEG 2 broadcasting system.

As described above, the signaling information of 206 OMI, 207 LMI, and 208 ULI includes information related to service connection, is transmitted from an upper layer of the IP layer, and receives information (eg, Layer 2 signaling) in a lower layer of the IP layer. It is used to receive.

Therefore, according to the NGH protocol of FIG. 2, signaling information required for receiving information in a lower layer of the IP layer must be transmitted in an upper layer of the IP layer, and a specific method for this is required.

Hereinafter, an embodiment of the present invention proposes a method of transmitting signaling information including at least one of the above-described 206 OMI, 207 LMI, and 208 ULI through a service guide delivery interpreter (SGDD) in an upper layer of an IP layer. An example will be described with reference to the following tables.

In the following tables, "E" of "Type" means an element, and "" A means an attribute. And the number after "E" in "Type" means hierarchy. For example, if there is E6 under the E5 element in the following tables, it means that E6 belongs to the E5 element. In addition, "Category" means whether Network (N) and Temrinal (T) should support Mandatory (M) or Optional (O), and "Cardinality" means how many elements can be transmitted. do. For example, "1" indicates that one corresponding element is to be transmitted, and "0..N" means that the corresponding element can be transmitted from 0 to N.

Tables 1 to 9 below are proposed service guides for transmitting signaling information in an upper layer of an IP layer required for receiving information in a lower layer of an IP layer in an NGH IP profile in an embodiment of the present invention. One configuration example of a service guide delivery descriptor (hereinafter referred to as "SGDD") is shown. Tables 1 to 9 below are divided for convenience of description, but are actually composed of one table.

In the description of the service guide delivery interpreter (SGDD) of <Table 1> to <Table 9>, the contents not related to the present invention are omitted, and the known elements and elements of the SGDD are described in detail in the OMA BCAST Service Guide 1.1 standard. have. SGDD has a Notification Reception that provides information for receiving notification messages about an event, a BSMlist that provides information on currently receiving providers and roaming providers, and information about all service guide fragments transmitted through the current network. DescriptionEntry, Terminal capability that provides terminal requirement specification information for receiving arbitrary service, Rich media service such as SGEntrypoint, MPEG Laser, etc. which provides information necessary for receiving service guide in each mobile broadcasting transmission system. RMS to provide, Audience Measurement that can investigate the usage status of the mobile broadcast service, and Private Extension for allowing the carrier that transmits the SGDD to transmit arbitrary data.

According to the present invention a first embodiment of the present invention for transmitting signaling information-used to receive information (e.g. Layer 2 signaling) in a lower layer of the IP layer-via a service guide delivery interpreter (SGDD) is said service. The upper layer information (ULI), regional blending information (LMI), and other blending through the BAST (BCAST Subscription Management) specific entry point information ("BDSSpecificEntrypointInfo") in <Table 7> which is a lower element of a guide entry point (SGEntrypoint). To provide information (OMI).

The BDS-specific entry point information (BDSSpecificEntrypointInfo) is supported by OMA BCAST. As an element capable of providing information for smoothly receiving a service guide according to characteristics of a digital broadcasting system such as MCBCS and FLO (Forward Link Only), the present invention uses "BDSSpecificEntrypointInfo" of <Table 7> to receive NGH. Through at least one of the information of the ULI, LMI and OMI.

That is, in <Table 7>, the "UpperLayerInformation" element provides ULI signaling information and includes a version of the ULI and a ULI transmission period as lower attributes. The ULI version indicates the version of the ULI currently provided through SGDD. When the terminal finds a higher version of the ULI than the currently stored ULI version, the ULI version can receive a new ULI. The ULI transmission period informs the transmission time of the next ULI, thereby preventing the terminal from continuously receiving SGDD unnecessarily for obtaining the ULI.

In Table 7, the "LocalMultiplexInformation" element provides LMI signaling information and includes LMI version and LMI transmission period as lower attributes. The operation of the LMI version and the LMI transmission period is the same as the version and ULI transmission period of the ULI.

In <Table 7>, the "OtherMultiplexInformation" element provides OMI signaling information and includes OMI version and OMI transmission period as lower attributes. The operation of the OMI version and the OMI transmission period is the same as the version and ULI transmission period of the ULI.

According to the present invention a second embodiment of the present invention for transmitting signaling information-used to receive information (e.g. Layer 2 signaling) in a lower layer of the IP layer-via a service guide delivery interpreter (SGDD)

The "PrivateExt" field of SGDD illustrated in Table 9 is used. The PrivateExt field is a field that can provide additional data according to the necessity of the operator, and details thereof may be different for each operator. An operator providing a mobile broadcast service using NGH may provide at least one of the ULI, LMI, and OMI information using the PrivateExt field of the SGDD, and includes an UpperLayerInformation element, LocalMultiplexInformation element, described in the first embodiment. The same information as the OtherMultiplexInformation element may be transmitted.

The transmission of ULI, LMI, OMI, etc. using the SGDDs of Tables 1 to 9 has the following two advantages. First, BCAST SG has various fragrances as shown in FIG. It is possible to transmit fragments, and the combination of the fragments has the advantage of showing all the mobile broadcast services of a specific operator or a specific genre of portable broadcast services, the composition of the service guide through the combination of the fragments It is the SGDD that serves to inform the information. The SGDD is repeatedly transmitted as often as the terminal should receive first in order to receive a service provided through BCAST. Therefore, the NGH terminal can quickly acquire the ULI, LMI and OMI. Second, as shown in FIG. 2, a specific protocol is required to transmit the ULI, LMI, and OMI in an upper layer of the IP layer. The method needs to change the transmission of the existing IP series protocol or make a new protocol. When the BCAST SG is used, the method of receiving a terminal reduces the burden of using the conventional protocol.

FIG. 3 is a diagram illustrating a configuration of a transmitter for generating and transmitting an SGDD including signaling information to a terminal according to the first or second embodiment of the present invention. FIG. 5 is a diagram illustrating the signaling information in the transmitter of FIG. 3. It is a flow chart showing the process of creation.

Referring to FIG. 3, the 301 NGH signaling information generator generates signaling information necessary for ULI, LMI, and OMI in SGDD having the structure illustrated in Table 7 or Table 9.

Referring to FIG. 5, the process of generating the signaling information will be described. In step 501 of FIG. 5, the transmitting apparatus determines whether a new SGDD is required, and when a new SGDD is needed, an identifier, version of the SGDD in step 502. Set basic information such as validity. In step 503, generation of NGH signaling information is started as the signaling information. In step 504, it is determined whether the OMI-related information, that is, information such as a network identifier and NGH frequency, is changed. If the OMI information is changed, the related information is changed in step 505. Otherwise, in step 506, the OMI information is not changed. Proceed. In step 506, the transmitting apparatus checks whether the ULI information has changed. When the ULI information is changed, the service and information corresponding to the PLP or LLP are changed. When the ULI information is changed, related information is changed at step 507. Otherwise, the ULI information is changed without changing the U LI information. Proceed to step. The transmitting apparatus determines whether the LMI information has been changed in step 508, and if the LMI information has changed, changes the related information in step 509 and completes the NGH signaling information in step 510. If there is no change in the LMI information, the process proceeds from step 508 to step 510 to complete the information of the NGH signaling part.

The information changed in the description of FIG. 5 may be changed in order. That is, it can be changed in the order of LMI, OMI, ULI, and in other order. The 302 SGDD generating unit and the transmitting unit of FIG. 3 generates the SGDDs of the structures illustrated in Tables 1 to 9, and transmits the SGDD to the 304 mobile broadcasting terminal through the 303 transmission network. The 303 transmission network may be a network providing a broadcast channel or a communication network providing a bidirectional channel. 3 may be implemented by one or a plurality of servers.

4 is a diagram illustrating a configuration of a terminal as a receiving device for receiving SGDD including signaling information according to the first or second embodiment of the present invention, and FIG. 6 is a diagram illustrating receiving the signaling information at the receiving device of FIG. 4. A flow chart showing the process.

Referring to FIG. 4, the 404 transport network corresponds to the 403 transport network of FIG. 3. The 403 SGDD receiver receives the SGDD transmitted through the 404 transport network and transmits the received SGDD to the 402 SGDD resolver. The 402 SGDD decomposition unit extracts each element and attributes from the received SGDD, and delivers the elements and attributes to the 401 SGDD analyzer. The 401 SGDD analyzer analyzes the information in the SGDD sent from the 402 SGDD resolver, and an example of operations of the 401 SGDD resolver and the 401 SGDD parser is illustrated in FIG. 6. The 401 SGDD analyzer of FIG. 4 may be implemented as a controller.

FIG. 6 assumes an operation of a terminal when the first embodiment and the second embodiment proposed in the present invention are used in parallel. When the terminal performs only one operation of the first and second embodiments, FIG. In step 601 of FIG. 6, the terminal determines whether a new SGDD is received or not, and if the new SGDD is received, in step 602, basic information of the SGDD is extracted. Check to determine if an appropriate SGDD has been received. If the appropriate SGDD is received, the terminal checks whether the information in the SGDD is changed in step 603. In this process, the terminal checks whether new information is provided using version information of ULI, OMI, and LMI proposed in the present invention with respect to NGH signaling information. In step 604, the terminal determines the location of the NGH signaling information. That is, the terminal checks whether there is NGH signaling information in the BDSSpecificEntryPointInfo field, which is the first embodiment of the present invention, or whether there is NGH signaling information in the PrivateEXT field of SGDD, which is the second embodiment of the present invention. When NGH signaling information is present in the BDSSpecificEntryPointInfo field, the NGH signaling information is acquired in step 605, and other SGDD information is checked in step 606. If the NGH signaling information does not exist in the BDSSpecificEntryPointInfo field in step 604, after checking the PrivateExt field in step 610, the NGH signaling information is obtained in step 611, and other SGDD information is checked in step 606. The order of confirming the other SGDD information and acquiring the NGH signaling information may be changed. The terminal prepares to receive the portable broadcast service transmitted through the NGH according to the information identified in step 607, and ends the operation in step 608.

<Table 10> to <Table 14> is another configuration example of the BDSSpecificEntryPointInfo proposed in the embodiment of the present invention, the apparatus and method of FIGS. 3 to 6 are also shown in the embodiments of <Table 10> to <Table 14> Apply. In addition, specific definitions of well-known terms used in <Table 10> to <Table 14> are described in detail in the OMA BCAST Service Guide 1.1 standard.

Referring to Table 10, the above-described upper layer information (ULI), regional mixed information (LMI), and other mixed information (OMI) are provided through BDS specific entry point information ("BDSSpecificEntrypointInfo").

As another configuration example of the upper layer information (ULI), the "UpperLayerInformation" element in Table 10 includes a "Service" element as a lower element. The "Service" element provides information of services through a current channel, and includes a "Component" element as a lower element. The "Component" element provides information on a component, and includes its "ComponentLocation" element and a "ROHCInfo" element. The "ComponentLocation" element provides location information of a component such as a URL, an IP address, a port number, and the "ROHCInfo" element provides information of a Robust Header Compression (ROHC) related to compression. As another configuration example of the LMI, the "LocalMultiplexInformation" element in <Table 12> includes a "LLP_ID" element as a lower element thereof. The "LLP_ID" element uniquely identifies a Logical Layer Pipe (LLP) in the network. In addition, the "LLP_ID" element includes sub-elements of "T_INT_LLPF" element, "BS_LLPF" element, and "PLP_ID" element. The "T_INT_LLPF" element represents the time between two consecutive LLP frames of the LLP. The receiver calculates whether it can process the previous LLP frame for the time indicated by this parameter, and empty the buffer for processing of the next LLP frame. The "BS_LLPF" element indicates the maximum buffer size, that is, the maximum size of an LLP frame, and the "PLP_ID" element uniquely identifies a Physical Layer Pipe (PLP).

As another configuration example of the other mixed information (OMI), in the <Table 13>, the "OtherMultiplexInformation" element includes a "n_of_multiplexes" element as its sub-element. The "n_of_multiplexes" element indicates the number of multiplexes signaled. , Its child elements include a "Frequency" element, a "Guard_INTERVAL" element, a "FFT-SIZE" element, a "PILOT_PATTERN" element, a "cell_id" element, a "frame_synch_offset" element, and a "Component_Info" element. Referring to Table 14, the "Frequency" element indicates the frequency at which the associated multiplex is transmitted, and the "Guard_INTERVAL" element indicates the guard interval of the current super frame. . The "FFT-SIZE" element indicates a fast fourier transform (FFT) size, and the "PILOT_PATTERN" element indicates a pilot pattern used for an OFDM symbol. The "cell_id" element uniquely indicates a cell in the network, and the "frame_synch_offset" element is an offset between physical layer frames transmitted in the associated neighboring multiplex associated with the physical layer frame transmitted in the current multiplex. And a "Component_Info" element provides information of services / services in the current and neighboring / adjacent multiplexes.

Claims (10)

In the method for transmitting signaling information in a digital broadcasting system,
Generating signaling information used when receiving information for receiving a broadcast service in a lower layer of the IP layer;
Configuring a service guide delivery interpreter (SGDD) including the signaling information; And
And transmitting the SGDD including the signaling information through a transmission network of a broadcast service. The method of claim 1,
The signaling information is a method for transmitting signaling information including Layer 2 signaling information associated with a service connection. The method of claim 1,
The signaling information is a method for transmitting signaling information present in an upper layer of the IP layer. The method of claim 1,
The signaling information includes signaling information including at least one of upper layer information (ULI), local multiplex information (LMI), and other multiplex information (OMI) in DVB-NGH. How to transfer. The method of claim 1,
The signaling information is a method for transmitting signaling information included in one of the BDSSpecificEntrypointInfo field or PrivateExt field of the SGDD. A transmitter for transmitting signaling information in a digital broadcasting system,
A transmitter for transmitting a service guide delivery analyzer (SGDD) through a transmission network of a broadcast service; And
And a controller configured to generate signaling information used when receiving information for broadcast service reception in a lower layer of an IP layer, and to configure the SGDD to include the signaling information. The method according to claim 6,
The signaling information includes Layer 2 signaling information related to service connection. The method according to claim 6,
The signaling information is located in an upper layer of the IP layer. The method according to claim 6,
The signaling information includes at least one of upper layer information (ULI), local multiplex information (LMI), and other multiplex information (OMI) in DVB-NGH. The method according to claim 6,
The signaling information is included in one of a BDSSpecificEntrypointInfo field or a PrivateExt field of the SGDD.

Images