KR20080098750A - Broadcast data transmission method, receiving method and relay method in IP network - Google Patents

Abstract

Disclosed are a method of transmitting, receiving, and relaying broadcast data in an IP network.

Description

Method of transmitting, receiving and relaying broadcast data in the IP network {METHOD OF SENDING, RECEIVING, AND RELAYING A BROADCASTING DATA IN INTERNET PROTOCOL NETWORK}

1 is a diagram illustrating a data structure of a TS packet in a DVB-H system.

2 is a diagram showing the configuration of a DVB-H system;

3 is a diagram showing the configuration of a DVB-H system for broadcasting a DVB-H broadcast to an IP network;

4 is a view for explaining a method of transmitting and receiving broadcast data in an IP network according to an embodiment of the present invention;

5 is a view for explaining a method of relaying broadcast data in an IP network according to an embodiment of the present invention; and

6 is a view for explaining a broadcast data relay method in an IP network according to another embodiment of the present invention.

Brief description of the main parts of the drawing

300: transmitter 310: IP network

320: receiver 330: repeater

The present invention relates to a method of transmitting, receiving and relaying broadcast data in an IP network.

In general, a broadcast service aims to provide a broadcast service to all users having a terminal. Such broadcast services include audio broadcasting services such as radio broadcasting that provides only voice, and video-oriented broadcasting services such as TV which provides voice and video services, and multimedia broadcasting services including voice, video and data services. These broadcast services are based on the analog method, and digital broadcasting is being performed according to the rapid development of technology.

In addition, the broadcasting service uses a multimedia service of a wired network that provides high-definition and high-speed data together with a wired network and a method of providing a multimedia service by using a satellite and a wired and satellite at the same time. It is evolving in a variety of ways.

In addition, researches on applications that can be used when transmitting a broadcast service to a terminal based on an IP network are being conducted.

An object of the present invention is to provide a broadcast data transmission method, a reception method, and a relay method in an IP network to efficiently transmit and receive broadcast data in an IP network.

According to an aspect of the present invention, there is provided a method of receiving broadcast data in an IP network, the method including: receiving an IP (Internet Protocol) packet including one broadcast program data; And decoding and reproducing broadcast program data included in the IP packet when the address of the multicast group included in the header of the IP packet is the same as its own address.

In a method of transmitting broadcast data in an IP network according to an embodiment of the present invention, each IP (Internet Protocol) packet having different broadcast program data is transmitted to the IP network.

In the IP network according to an embodiment of the present invention, a method of relaying broadcast data may include receiving respective broadcast program data generated by different broadcast stations via an IP network; And generating an IP packet including at least one broadcast program data of each broadcast program data, and transmitting the generated IP packet.

DVB-H (Digital Video Broadcasting-Handheld) is a standard for enhancing mobility in DVB-T, a European digital TV transmission standard, and considering the low power, mobility, and portability of mobile terminals and portable video devices, DVB-T This is an extended specification from. Therefore, most of the physical layer standard of DVB-H follows the standard of DVB-T and adds some additional functions for portable / mobile reception.

The DVB-H system supports additional error and correction encoding for Layer 3 IP packets. This additional error correction encoding process is called Multi Protocol Encapsulation-Forward Error Correction (MPE-FEC).

In the DVB-H system, broadcast data is generated as an IP datagram, and an MPE-FEC frame is formed by reed-solomon encoding the IP datagram.

Accordingly, the MPE-FEC frame is composed of an MPE section carrying an IP datagram and an MPE-FEC section carrying parity data according to R-S encoding. The MPE section and the MPE-FEC section are carried in a payload of a transport stream (TS) packet, which is a transport unit of a DVB-H system, and transmitted through a physical layer.

1 is a diagram illustrating a data structure of a TS packet in a DVB-H system.

In Fig. 1, reference numeral 11 shows an IP datagram on which broadcast data is carried. Reference numeral 13 shows an MPE section carrying the IP datagram 11 or an MPE-FEC section carrying parity data of the IP datagrams 11.

Reference numeral 15 shows a TS packet carrying an MPE section or an MPE-FEC section 13. Here, one TS packet 15 may include multiple MPE sections or MPE-FEC sections 13, or one MPE section or MPE-FEC sections 13 may be transmitted through multiple TS packets 15. have.

As a result of the MPE-FEC process, IP datagrams are RS encoded to form an MPE-FEC frame. Data constituting the MPE-FEC frame is reconstructed in a transmission unit called a section.

The IP datagram 11 is reconstructed into an MPE section by adding 32 bits of a section header and a cyclic redundancy check (CRC), and parity data generated through RS encoding. Reconstructed into FEC section.

The section header contains information required for MPE-FEC processing and time slicing, and is located at the beginning of the section. The CRC 32 bits are located later in the section. These sections are finally carried in the payload portion of the TS packet 15 and transmitted through the physical layer.

2 is a diagram illustrating the configuration of a DVB-H system.

Referring to FIG. 2, the transmitter 100 of the DVB-H system transmits each IP data such that the MPE-FEC encoder 102 transmits each IP datacast (or IP datagram) transmitted as broadcast data in sections. An MPE section including a cast is generated, and an MPE-FEC section including parity data for forward error correction of the MPE section is generated. Parity data is generated through RS coding, a well-known external coding technique.

The output of the MPE-FEC encoder 102 is passed to a time slicing processor 104 to perform time division processing for transmitting broadcast data as burst data. One MPE-FEC frame is transmitted through one burst period.

The TS data processing unit 106 converts data input from the time slicing processor 104 into TS (Transport Stream) data, which is a transmission standard for DVB-H data. The TS data is modulated by the RF modulator 108 and finally transmitted to the TS packet, which is a DVB-H signal, through the antenna ANT.

The DVB-H receiver 200 includes an RF demodulator 202, a TS data processor 204, a time slicing processor 206, an MPE-FEC decoder 208, and receives a TS packet through a physical layer. Restore the IP datacast including the broadcast data.

More specifically, the DVB-H receiver 200 classifies and extracts the MPE section and the MPE-FEC section from the TS packet, and configures the extracted data into MPE-FEC frames to restore the IP datacast. At this time, only data (ex: IP datacast 2) selected by a user's channel selection is decoded and displayed on the screen.

FIG. 3 is a diagram illustrating a configuration of a DVB-H system for broadcasting DVB-H broadcast to an IP network.

Referring to FIG. 3, the DVB-H transmitter 300 includes an IP encapsulator 308 unlike the DVB-H transmitter 100 of FIG. 2. The IP encapsulator 308 attaches an IP header to the TS data generated by the TS data processing unit 306 to generate an IP packet, and broadcasts the generated IP packet to the IP network 310.

The DVB-H receiver 320 also includes an IP decapsulator 322, unlike the DVB-H receiver 200 of FIG. 2. The IP decapsulator 322 removes the header from the IP packet received from the IP network 310, and then transfers TS data to the TS data processor 324.

In this manner, since DVB-H data must be broadcast to all network terminals, there is a problem that all resources of the network must be used. In addition, since a plurality of broadcast service programs are broadcasted in an IP packet, all terminals analyze an IP packet received through an IP network, and a problem arises in that unnecessary broadcast service programs should be discarded.

Embodiments of the present invention propose methods for efficiently using broadcast data in an IP network.

<Transmission method and reception method of broadcast data>

The method and method of transmitting broadcast data according to an embodiment of the present invention propose a method of transmitting IP data of DVB-H to an IP network as a unit of a broadcast program and a method of receiving from an IP network.

4 is a diagram illustrating a transmission method and a reception method of broadcast data in an IP network according to an embodiment of the present invention. The building blocks of the DVB-H transmitter and the DVB-H receiver described in the embodiment of the present invention are the same as the DVB-H transmitter 300 and the DVB-H receiver 320 shown in FIG. Will be explained.

In addition, in FIG. 4, the transmitter 300 refers to a broadcasting device operated by a DVB-H broadcasting service provider, a cable operator, or an IP TV operator.

Referring to FIG. 4, the transmitter 300 packetizes an IP datacast for each broadcast program. That is, in FIG. 1, IP datacast 1, IP datacast 2, and IP datacast 3 mean different broadcast programs. For example, IP datacast 1 may correspond to a news broadcast of an MBC broadcasting station, IP datacast 2 to a comedy broadcast of SBS, and IP datacast 3 to correspond to an education broadcast of EBS.

Each IP datacast is converted into respective TS data via the MPE-FEC encoder 302, the time slicing processor 304, and the TS data processing unit 306, and outputted. The IP encapsulator 308 copies the IP header portion of each IP datacast and attaches the TS data to the TS data, thereby generating an IP packet for each broadcast service and then transmitting the IP packet to the IP network 310.

At this time, a different multicast address is used for each broadcast program in the destination address of the IP header. That is, according to an embodiment of the present invention, IP packets including a plurality of broadcast programs are not broadcasted to an IP network as in the related art, but IP packets including one broadcast service are multicasted for each broadcast program. Therefore, the transmission efficiency in the IP network is higher than before.

The IP packet for each broadcast program is delivered by a routing policy of each IP network and then arrives at the final user terminal 400 including the DVB-H receiver 320 via the repeater 330.

The user terminal 400 receives an IP packet having the same IP header as the data currently being viewed, that is, the same destination address, and then decapsulates, decodes, and plays the received IP packet.

<Relay method of broadcasting data>

The broadcast data relay method according to an embodiment of the present invention uses the fact that DVB-H data is based on IP datacast.

5 is a diagram illustrating a method of relaying broadcast data in an IP network according to an embodiment of the present invention.

In FIG. 5, each broadcaster 500 broadcasts IP datacasts for each broadcast service to the IP network 310. For example, broadcasting station 1 500 may correspond to MBC broadcasting station, broadcasting station 2 500 may correspond to SBS broadcasting station, broadcasting station 3 500 may correspond to EBS broadcasting station, IP datacast 1 is news broadcasting data, and IP datacast 2 is comedy. The broadcast data and IP datacast 3 may correspond to educational broadcast data.

 Each IP datacast broadcast by each broadcasting station is delivered by the routing policy in the IP network 310 and then to the relay 330.

In this embodiment, the repeater 330 includes the same components as the transmitter 300. That is, the repeater includes an MPE-FEC encoder 302, a time slicing processor 304, a TS data processor 306, and an IP encapsulator 308.

The repeater 330 generates an IP packet including an IP datacast for each broadcast service received from the IP network 310 and broadcasts it to all the terminals 400. As such, according to an embodiment of the present invention, a DVB-H broadcast service can be provided using a repeater connected to an existing communication network without installing a separate repeater for DVB-H service.

Each terminal 400 receives and decapsulates an IP packet and obtains an IP datacast through a DVB-H decoding process. The user selects only the IP datacast that he / she wants to watch through channel selection to watch the broadcast.

6 is a view for explaining a broadcast data relay method in an IP network according to another embodiment of the present invention.

Referring to FIG. 6, each broadcaster 500 broadcasts an IP datacast for each broadcast service to the IP network 310. For example, broadcasting station 1 500 may correspond to MBC broadcasting station, broadcasting station 2 500 may correspond to SBS broadcasting station, broadcasting station 3 500 may correspond to EBS broadcasting station, IP datacast 1 is news broadcasting data, and IP datacast 2 is comedy. The broadcast data and IP datacast 3 may correspond to educational broadcast data.

 Each IP datacast broadcast by each broadcasting station is delivered by the routing policy in the IP network 310 and then to the relay 330.

In this embodiment, the repeater 330 includes the same components as the transmitter 300. That is, the repeater includes an MPE-FEC encoder 302, a time slicing processor 304, a TS data processor 306, and an IP encapsulator 308.

The repeater 330 generates IP packets for broadcast program data received from the IP network 310, that is, for each IP datacast. That is, in the present embodiment, the repeater 330 generates each broadcast program data, that is, an IP packet corresponding to each IP datacast, like the transmitter 300 shown in FIG. 4. Therefore, each IP packet generated in the repeater 330 includes one different broadcast program data.

For example, the relay 330 that receives the IP datacast 1 from the IP network 310 converts the IP datacast 1 into TS data in the DVB-H format, and then attaches an IP header to generate the IP packet 1. At this time, the header of IP packet 1 is given a multicast address corresponding to the MBC specific news broadcasting service.

As such, the IP packets generated for each broadcast program in the repeater 300 are delivered to the user terminals 400. The user terminal 400 receives an IP packet having the same IP header as the data currently being viewed, that is, the same destination address, and then decapsulates, decodes, and plays the received IP packet.

In the above-described embodiment, the DVB-H broadcasting service has been described as an example of mobile broadcasting, but the technical idea of the present invention is not limited thereto. That is, the present invention can be applied to all broadcast services based on IP.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described specific embodiment, and the present invention may be used in the art without departing from the gist of the present invention as claimed in the claims. Anyone skilled in the art can make various modifications, as well as such changes fall within the scope of the claims.

As described above, according to an embodiment of the present invention, there is an advantage in that broadcast data can be efficiently transmitted through an IP network.

Claims (7)

Receiving an Internet Protocol (IP) packet including one broadcast program data; And And decoding and reproducing broadcast program data included in the IP packet when the address of the multicast group included in the header of the IP packet is the same as its own address. A method of transmitting broadcast data in an IP network, wherein each IP (Internet Protocol) packet having different broadcast program data is transmitted to an IP network. The method of claim 2, Each IP packet has a destination address in the header of the IP packet having a different value. The method of claim 2, In the destination address in the header of the IP packet, A method of transmitting broadcast data in an IP network, characterized in that a multicast address is included. Receiving respective broadcast program data generated by different broadcasting stations via an IP network; And Generating an IP packet including at least one broadcast program data of each broadcast program data, and transmitting the generated IP packet; and relaying the broadcast data in the IP network. The method of claim 5, If the IP packet includes one broadcast program data, the destination address in the header of the IP packet includes a multicast address corresponding to the one broadcast program. . The method of claim 5, And when the IP packet includes a plurality of different broadcast program data, a destination address in the header of the IP packet includes a broadcast address.

Images