KR102001014B1 - Network apparatus, transmitter and packet transmitting method for next-generation terrestrial broadcasting service - Google Patents

Abstract

A next generation terrestrial broadcast network apparatus, a transmitting apparatus and a packet transmitting method are disclosed. The next generation terrestrial broadcast network apparatus according to an embodiment includes an input unit for receiving an input packet including a network layer protocol packet, a packetizer for packetizing the received network layer protocol packet into a link layer protocol packet for next generation terrestrial broadcast, A scheduler for generating a baseband frame including a link layer protocol packet, and an output unit for outputting the generated baseband frame.

Description

[0001] The present invention relates to a terrestrial broadcast network apparatus, a transmission apparatus, and a packet transmission method,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadcasting service and transmission technology, and more particularly, to a next generation terrestrial broadcasting service and transmission technology.

If the application of content compression and transmission technology based on MPEG-2 Transport Stream (TS) (hereinafter referred to as TS), which is generally used for media generation and transmission in a digital broadcasting network, has been dominant, UHD (Ultra High Definition) In next-generation broadcasting systems, IP-based end-to-end technology is gradually being introduced from media creation to transmission and reception. With the introduction of IP technology, hybrid network service that combines broadcast network and communication network (IP network) is expanded, and flexible and easy system matching is possible compared to existing methods in packet configuration and delivery method.

Although DVB-T2 (Digital Video Broadcasting-Terrestrial version 2), a representative next-generation terrestrial broadcasting standard, has already defined interfaces and protocol specifications for IP-based broadcasting services, the uncertainty regarding the introduction of IP technologies in terrestrial broadcasting, It is not widely available due to lack of receiving terminal.

As another next generation terrestrial broadcasting standard, ATSC 3.0, which is being developed by ATSC (Advanced Television Systems Committee), is based on IP based media segment streaming and can support hybrid broadcasting service, multi screen service and personalized service. The technical characteristics of the media transmission in the ATSC 3.0 specification are that the ISO Base Media File Format (ISOBMFF) media file format is used in a dynamic adaptive streaming over HTTP (DASH) / real-time object delivery over unidirectional transport (ROUTE) (MMT) protocol to construct a transmission packet suitable for a broadcasting network.

In order to provide next generation broadcasting service based on IP, media stream transmission through a broadcasting network should be premised on a stable fixed bit rate. In the MPEG-2 TS-based broadcasting system, all transmission units are configured in units of TS packets (188 bytes) for transmission of signaling information and additional information as well as media streams, and transmitted through a multiplexer (MPEG-2 TS multiplexer). Transmission of IP packets (20 ~ 1500 bytes) with a flexible size compared to the TS stream transmission structure is efficient in terms of payload transmission overhead. However, the system to implement this is effective for resource management and traffic input / output Control is required. In addition, it should have a robust functional structure to cope with potential error situations.

According to one embodiment, a network apparatus, a transmitting apparatus, and a packet transmitting method for efficiently transmitting a packet in a next generation terrestrial broadcasting service are proposed.

The next generation terrestrial broadcast network apparatus according to an embodiment includes an input unit for receiving an input packet including a network layer protocol packet, a packetizer for packetizing the received network layer protocol packet into a link layer protocol packet for next generation terrestrial broadcast, A scheduler for generating a baseband frame including a link layer protocol packet, and an output unit for outputting the generated baseband frame.

The link layer protocol packet may be an ATSC 3.0 link layer protocol packet, and the baseband frame may be an ATSC 3.0 baseband frame. The network layer protocol packet may be a media segment packet and a transport stream packet.

The input unit may receive the link layer signaling packet separately from the network layer protocol packet, and may transmit the link layer signaling packet to the scheduler. The input unit may include an input interface having an IP multicast address and a port number different from the input interface for the network layer protocol packet Lt; RTI ID = 0.0 > a < / RTI > link layer signaling packet.

The scheduler includes a link layer protocol processing unit for generating a link layer protocol packet from an input packet, a baseband frame processing unit for generating a baseband frame by linking the generated link layer protocol packets, a base for controlling resources of the baseband frame processing unit, Band frame scheduler.

The link layer protocol processing unit may remove the header of the network layer protocol packet, generate a link layer protocol packet, and transmit the generated link layer protocol packet to the baseband frame processing unit.

The baseband frame processing unit sequentially links the link layer protocol packets to the baseband frame payload according to the resource configuration method indicated by the baseband frame scheduler, and then adds the baseband frame header to the baseband frame payload, And a baseband frame generator for generating a baseband frame.

The baseband frame processing unit may include a baseband frame scrambler that scrambles the generated baseband frame.

The scheduler further includes an additional information processing unit for transmitting physical layer signaling information and time information to the baseband frame processing unit. The baseband frame processing unit can output physical layer signaling information and time information together with the generated baseband frame .

The next generation terrestrial broadcast network apparatus further includes an input buffer for storing an input packet and a packetized link layer protocol packet and an output buffer for storing a baseband frame, and the scheduler monitors buffer information from an input buffer and an output buffer .

A transmission apparatus according to another embodiment includes a media encoder for encoding a video / audio source to generate a transport stream packet, a media segment transmission unit for transmitting a media segment packet conforming to a transmission protocol standard, Receives a media segment packet from a media segment transmission unit and packetizes a network layer protocol packet including a transport stream packet and a media segment packet into a link layer protocol packet for a next generation terrestrial broadcast and transmits a packetized link layer protocol packet And a transmitter for outputting broadcast service data including a baseband frame output from the next generation terrestrial broadcast network apparatus.

The transmitting apparatus may further include a service signaling unit for generating service signaling information necessary for receiving a broadcast service and transmitting service signaling information in a packet form to a next generation terrestrial broadcast network apparatus.

The transmitting apparatus may further include a timing synchronization unit for transmitting timing synchronization information required for time synchronization of broadcast data between apparatuses to a next generation terrestrial broadcast network apparatus.

According to another aspect of the present invention, there is provided a packet transmission method for next generation terrestrial broadcasting, the method comprising: receiving an input packet including a network layer protocol packet; packetizing the received network layer protocol packet into a link layer protocol packet for next generation terrestrial broadcast Generating a baseband frame including a packetized link layer protocol packet, and outputting the generated baseband frame.

The link layer protocol packet may be an ATSC 3.0 link layer protocol packet, and the baseband frame may be an ATSC 3.0 baseband frame.

The packetizing step may include removing a header of a network layer protocol packet and generating a link layer protocol packet, and storing the generated link layer protocol packet in an input buffer.

The step of generating a baseband frame includes: linking link layer protocol packets to a baseband frame payload in order according to a resource configuration method, and then adding a baseband frame header to a baseband frame payload to generate a baseband frame And storing the generated base bad frame in an output buffer. The step of generating the baseband frame may further comprise scrambling the generated baseband frame.

In outputting the baseband frame, the physical layer signaling information and the time information may be output together with the baseband frame generated when the frame transmission time arrives.

According to an embodiment, a packet can be efficiently transmitted during a next generation terrestrial broadcast service. For example, by packetizing a network layer protocol packet as a link layer protocol for next generation broadcast and framing it as a baseband frame, it is possible to efficiently transmit media segment packets as well as MPEG-2 TS packets based on the ATSC 3.0 standard . Further, signaling data for a next generation terrestrial broadcast service can be efficiently transmitted through link layer signaling data generation and processing.

1 is a configuration diagram of a transmitting apparatus for providing a next generation terrestrial broadcast service according to an embodiment of the present invention;
FIG. 2 is a detailed configuration diagram of the gateway of FIG. 1 according to an embodiment of the present invention;
FIG. 3 is a detailed configuration diagram of the scheduler of FIG. 2 according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating a packet transmission method for next generation terrestrial broadcasting according to an embodiment of the present invention. FIG.
5 is a structural view of a BB frame according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, 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. , Which may vary depending on the intention or custom of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

Each block of the accompanying block diagrams and combinations of steps of the flowcharts may be performed by computer program instructions (execution engines), which may be stored in a general-purpose computer, special purpose computer, or other processor of a programmable data processing apparatus The instructions that are executed through the processor of the computer or other programmable data processing equipment will generate means for performing the functions described in each block or flowchart of the block diagram.

These computer program instructions may also be stored in a computer usable or computer readable memory capable of directing a computer or other programmable data processing apparatus to implement the functionality in a particular manner so that the computer usable or computer readable memory It is also possible for the instructions stored in the block diagram to produce an article of manufacture containing instruction means for performing the functions described in each block or flowchart of the flowchart.

And computer program instructions may be loaded onto a computer or other programmable data processing equipment so that a series of operating steps may be performed on a computer or other programmable data processing equipment to create a computer- It is also possible that the instructions that perform the data processing equipment provide the steps for executing the functions described in each block of the block diagram and at each step of the flowchart.

Also, each block or step may represent a portion of a module, segment, or code that includes one or more executable instructions for executing the specified logical functions, and in some alternative embodiments, It should be noted that functions may occur out of order. For example, two successive blocks or steps may actually be performed substantially concurrently, and it is also possible that the blocks or steps are performed in the reverse order of the function as needed.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the following embodiments of the present invention may be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. The embodiments of the present invention are provided to enable those skilled in the art to more fully understand the present invention.

FIG. 1 is a block diagram of a transmitting apparatus for providing a next generation terrestrial broadcast service according to an embodiment of the present invention. FIG. 1 is a diagram illustrating a relationship between a next generation terrestrial broadcast network apparatus and a peripheral apparatus for broadcasting. The next generation terrestrial broadcast network device may be a next generation terrestrial broadcast gateway device (hereinafter referred to as a gateway) 15 as shown in FIG.

Referring to FIG. 1, the transmission apparatus 1 is described as an embodiment according to the ASTC 3.0 standard, but may conform to other standards other than the ASTC 3.0 standard. ATSC 3.0 has a differentiating function from DVB-T2. First, not only the well-known network layer protocol packets (for example, IP packets and TS packets) but also undefined network packets (Generic Packets) are received and a baseband frame is formed therefrom, can do. Second, each physical layer pipe (PLP) having a physical channel characteristic can perform independent modulation and channel parameters such as a code rate and a code length can be set and operated Environment. Accordingly, the present invention is applicable to a system configuration requiring multiple-PLP configuration such as layered division multiplexing (LDM). Finally, link layer signaling (LLS) information is received and processed through an input interface having a specific IP multicast address and port number.

1, the transmission apparatus 1 includes a media encoder 11, a media segment transmission unit 12, a service signaling unit 13, a timing synchronization unit 14, a gateway 15 and a transmitter 16 .

The media encoder 11 encodes (compresses or extracts) an input video / audio source according to a broadcasting schedule, and generates a broadcasting format that can be transmitted together with related metadata information. The broadcast format may be, for example, an MPEG-2 Transport Stream (TS) packet or a DASH segment packet.

The media segment transmitter 12 constructs a media segment packet conforming to the specification of each transmission protocol such as the ROUTE / DASH transmission protocol or the MMT transmission protocol, and then transmits the media segment packet to the gateway 15. When transmitting to the gateway 15, UDP / IP transmission protocol can be used. The media segment packet may be an IP packet.

The service signaling unit 13 generates service signaling information necessary for receiving a broadcast service and periodically transmits service signaling information to the gateway 15 in the form of a multicast packet. The timing synchronization unit 14 transmits to the gateway 15 the time synchronization information necessary for time synchronization of the inter-device broadcast data. The time synchronization information may be UTC (Coordinated Universal Time) or GPS (Global Positioning System) clock information.

The transmitter 16 transmits the broadcast service data output from the gateway 15 as an output signal to the broadcast network 17 with reference to the physical layer (L1) signaling information.

The gateway 15 may receive not only IP packets output through the media segment transmission unit 12 but also MPEG-2 TS packets output via the media encoder 11 as input. The next generation terrestrial broadcasting service based on ATSC 3.0 recommends a functional structure based on an IP-based input / output interface. However, in order to utilize existing MPEG-2 TS equipment and to minimize burden due to IP conversion, Support.

The service signaling information received from the gateway 15 includes an input interface (having a predetermined IP multicast address and a port number) different from the media data received from the media encoder 11 and the media segment transmitter 12 . All media data and service signaling information received by the gateway 15 are separated into packet delimiters and packetized into link layer protocol packets, and packetized link layer protocol packets are framed into baseband frames. And may be output to the transmitter 16 together with the L1 signaling information and the time information (timing synchronization information) in the inputted order. In accordance with the ATSC 3.0 specification, the link layer protocol packet is an ATSC 3.0 Link-layer Protocol (ALP) packet, and the baseband frame may be an ATSC 3.0 baseband frame.

2 is a detailed configuration diagram of the gateway of FIG. 1 according to an embodiment of the present invention.

1 and 2, the gateway 15 includes an input unit 150, a scheduler 152, an output unit 154, and a memory 156.

The input unit 150 performs an input interface and an input buffer management function for a media segment packet and a link layer signaling (LLS) packet. The input unit 150 sequentially loads the LLS packet and the packets received from the plurality of media segment packet input interfaces into the input buffer 1560 in the memory 156. The input buffer 1560 can load packets by varying the capacity of the input buffer 1560 so that overflow does not occur as much as possible in the process of loading input packets with the allocated transmission bandwidth.

The scheduler 152 performs scheduling functions including ALP packet generation and processing, ATSC 3.0 baseband frame generation (hereinafter referred to as BB frame) processing, and related resource and policy control. The scheduler 152 may monitor buffer information from the input buffer 1560 and the output buffer 1562 of the memory 156. The detailed configuration of the scheduler 152 will be described later with reference to Fig.

The output unit 154 performs an output buffer management function for interfacing with the radiator 16. The output unit 154 outputs the BB frame and the series of information loaded in the output buffer 1562 of the memory 156 according to an interface protocol of the transmitter 16, for example, a DVB-T2 MI (modulation interface). In the present invention, the interface protocol between the output unit 154 and the transmitter 16 conforms to the ATSC 3.0 interface standard, and the implementation content of the specification does not fall within the scope of the present invention.

The input unit 150, the scheduler 152, and the output unit 154 may be configured as one input format, and multiple input formats having the same logically same structure may be configured. In this case, each input format can allocate and process resources corresponding to one PLP. The configuration values of the device configuration and policies of the entire gateway 15 can be received from the manager or monitored by the administrator through the gateway configuration manager screen (UI).

3 is a detailed configuration diagram of the scheduler of FIG. 2 according to an embodiment of the present invention.

2 and 3, the scheduler 152 includes an ALP processing unit 1520, a BB frame processing unit 1522, a side information processing unit 1524, and a BB frame scheduler 1526. The BB frame processing unit 1522, The BB frame generating unit 1522-1 and the BB frame scrambler 1522-2.

The ALP processor 1520 fetches the packets stored in the input buffer 1560 and generates an ALP packet by separating the LLS packet and the media segment packet. At this time, IP header compression and TS packet header removal can be performed in advance according to the gateway operation mode. Then, all the generated ALP packets are successively transmitted to the BB frame processing unit 1522.

The BB frame processing unit 1522 sequentially connects the ALP packets generated and received previously according to the resource configuration method indicated by the BB frame scheduler 1526 to the BB frame payload, (BB frame header) is added to complete the final BB frame. The BB frame generating unit 1522-1 acquires L1 signaling information and time information, which are parameters related to transmission from the additional information processing unit 1524, and continuously outputs the L1 signaling information and the time information to the output buffer 1562 at regular intervals together with the BB frames . The BB frame scrambler 1522-2 may scramble for the BB frame and send it to the output buffer 1562 prior to exporting the BB frame to the output buffer 1562. [

FIG. 4 is a flowchart illustrating a packet transmission method for next generation terrestrial broadcast according to an embodiment of the present invention. Specifically, FIG. 4 illustrates a process in which a gateway receives and processes IP-based packets in one input format defined in FIG. 2 will be. The packet processing can be performed in the same process according to the additional input format configuration.

The gateway receives multiple input packets over Ethernet (400, 402). If the input packet is an IP packet, each Ethernet interface can filter and process packets having a preset IP address and port number set by the gateway manager. (IP header compression, TS header elimination) for each input packet received in order, and ALP packets are generated (410, 412) and then loaded into a packet queue of the input buffer (420, 422).

Next, a BB frame generation scheduling process is performed on the ALP packets loaded in the packet queue of the input buffer. For example, every time an ALP packet accumulates in the packet queue of the input buffer, an ALP packet is loaded into the payload of the BB frame, and when a fixed length BB frame payload is configured, a BB frame header is added to the BB frame, (430). Then, the generated BB frame is scrambled (440) and output (460). Prior to output, the final BB frame may be loaded 450 into the output buffer and the final BB frame loaded. At this time, if the frame transmission time comes, the BB frame can be output. Furthermore, the physical layer signaling information and the time information can be output together with the BB frame.

5 is a structural view of a BB frame according to an embodiment of the present invention.

Referring to FIG. 5, the BB frame 5 includes a BB frame header field, a BB frame payload field and a padding field, and a BB frame payload field is composed of ALP packets. The gateway sequentially connects the ALP packets to the BB frame payload according to the resource configuration method, and adds the BB frame header field to the BB frame to complete the BB frame (5).

The embodiments of the present invention have been described above. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

1: transmitting apparatus 11: media encoder
12: media segment transmission unit 13: service signaling unit
14: timing synchronization unit 15: next generation terrestrial broadcast gateway
16: radiator 150: input
152: Scheduler 154:
156: memory 1520: ALP processor
1522: BB frame processing unit 1522-1: BB frame generating unit
1522-2: BB frame scrambler 1524:
1526: BB frame scheduler 1560: input buffer
1562: Output buffer

Claims (10)

An input for receiving an input packet including a network layer protocol packet;
(ATSC 3.0 layer protocol) packet by dividing the packets stacked in the input unit into LLS (link layer signaling) packets and media segment packets, and generates Internet protocol (IP) header compression and TS ) An ALP processing unit preceding the packet header removal;
A scheduler for packetizing the ALP packet into a link layer protocol packet for a next generation terrestrial broadcast and generating a baseband frame including the packetized link layer protocol packet; And
An output unit for outputting the generated baseband frame;
The terrestrial broadcast network apparatus comprising: The method according to claim 1,
Wherein the link layer protocol packet is an ATSC 3.0 link layer protocol packet, the baseband frame is an ATSC 3.0 baseband frame, and the network layer protocol packet is a media segment packet and a transport stream packet. The method according to claim 1,
Wherein the input unit comprises:
Layer signaling packet through an input interface having an IP multicast address and a port number different from the input interface for the network layer protocol packet, and transmits the received link layer signaling packet to the scheduler. The method according to claim 1,
The scheduler comprising:
A link layer protocol processing unit for generating the link layer protocol packet from the input packet, removing a header of the network layer protocol packet, and generating the link layer protocol packet;
A baseband frame processing unit for linking the generated link layer protocol packets to generate the baseband frame; And
And a baseband frame scheduler for controlling resources of the baseband frame processing unit. 5. The method of claim 4,
Wherein the baseband frame processor comprises:
Linking the link layer protocol packets to a baseband frame payload according to a resource configuration method indicated by the baseband frame scheduler and adding a baseband frame header to the baseband frame payload, A baseband frame generator for generating a baseband frame; And
A baseband frame scrambler for scrambling the generated baseband frame;
The terrestrial broadcast network apparatus comprising: 5. The method of claim 4,
The scheduler comprising:
An additional information processing unit for transmitting physical layer signaling information and time information to the baseband frame processing unit; Further comprising:
Wherein the baseband frame processor comprises:
And outputs the physical layer signaling information and time information together with the generated baseband frame. The method according to claim 1,
The next generation terrestrial broadcast network apparatus includes:
An input buffer in which the input packet and the packetized link layer protocol packet are stored; And
And an output buffer in which the baseband frame is stored,
The scheduler comprising:
And monitors buffer information from the input buffer and the output buffer. A media encoder for encoding a video / audio source to generate a transport stream packet;
A media segment transmission unit for transmitting a media segment packet conforming to a transmission protocol standard;
Receives a transport stream packet from the media encoder, receives a media segment packet from the media segment transmission unit, packetizes a network layer protocol packet including a transport stream packet and a media segment packet into a link layer protocol packet for next generation terrestrial broadcast A next generation terrestrial broadcast network device for generating a baseband frame including a packetized link layer protocol packet; And
A transmitter for outputting broadcast service data including a baseband frame output from the next generation terrestrial broadcast network device;
Lt; / RTI >
The next generation terrestrial broadcast network apparatus includes:
(ATSC 3.0 layer protocol) packet by separating packets into LLS (link layer signaling) packet and media segment packet, and removes Internet protocol (IP) header compression and transport stream (TS) packet header according to the operation mode of the gateway Wherein the transmitting device is a transmitting device. 9. The method of claim 8,
The transmitting apparatus includes:
A service signaling unit for generating service signaling information necessary for receiving a broadcast service and transmitting service signaling information in a packet form to the next generation terrestrial broadcast network device;
Further comprising: 9. The method of claim 8,
The transmitting apparatus includes:
And a timing synchronization unit for transmitting timing synchronization information necessary for time synchronization of broadcast data between the devices to the next generation terrestrial broadcast network device.

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