KR100818894B1 - Mdu brodacasting signal distribution system by transmitting ip mapping table - Google Patents

Abstract

An MDU Broadcasting signal distribution system in an IP mapping table transmission method is provided to perform the signal processing of a broadcasting signal and an IP mapping table in the same method when providing the broadcasting signal to a multiplex house or a building, thereby simplifying the structure of an MDU module and a set-top box. A broadcasting signal receiving unit(100) receives broadcasting signals. An MDU(Multi-Dwelling Unit) module(200) divides a multi-channel signal loaded on the broadcasting signals into each channel broadcasting signal, allocates IP(Internet Protocol) addresses to each divided channel to generate an IP mapping table, generates an MPEG(Moving Picture Experts Group) signal including IP mapping table data, allocates a preset IP address to the MPEG signal including the IP mapping table, applies an UDP(User Datagram Protocol) protocol to the MPEG signal including each of the channel broadcasting signals and the IP mapping table to record respectively applied instinct IP addresses, and transmits the channel broadcasting signals and the MPEG signal in a multicast method. A switch unit(300) receives a packet signal from the MDU module to distribute the received packet signal into at least one signal and transmit at least one signal. An MDU set-top box(400) is connected to the switch unit, connects with the IP address of the preset IP mapping table to receive a packet signal including the IP mapping table, extracts the IP mapping table from the packet signal and stores the IP mapping table, acquires an IP address corresponding to a broadcasting channel referring to the IP mapping table if a broadcasting channel is selected by external operation, receives the packet signal from the IP address corresponding to the broadcasting channel, and extracts the broadcasting signal from the packet signal, converts the broadcasting signal into AV(Audio/Video) signals and outputs the AV signals to the outside.

Description

MDU Brodacasting signal distribution system by transmitting IP mapping table

1 is an overall block diagram of an MDU broadcast signal distribution system according to a preferred embodiment of the present invention;

2 is a block diagram showing an internal configuration of an MDU module according to an embodiment of the present invention;

3 is a table showing a configuration of an IP mapping table generated in an MDU module according to an embodiment of the present invention;

4 is a view for explaining the contents of each field of the IP mapping table shown in FIG. 3;

5 is a block diagram showing the internal configuration of the MDU set-top box according to an embodiment of the present invention,

6 is a flowchart illustrating an operation process between an MDU module and an L3 switch in detail according to an embodiment of the present invention;

7 is a flowchart illustrating an operation process between an L3 switch and an MDU set-top box in detail according to an embodiment of the present invention;

8 is a diagram illustrating a UDP data structure carrying MPEG-2 TS according to a preferred embodiment of the present invention.

The present invention relates to an MDU broadcast signal distribution system using an IP mapping table transmission method, and particularly, receives a broadcast signal through a single broadcast receiving antenna in a multi-family residential or building with an IP network, and broadcast signal and IP mapping table. The present invention relates to a broadcast signal distribution system that processes an MPEG signal and transmits it to each MDU set-top box in a multicast manner through an IP network.

Multi-Dwelling Unit (MDU) is an Internet line connection device of a large residential area, and means a device that enables access to the Internet by using an existing telephone line installed in a multi-family house or building or using an IP network.

With the development of apartments and houses with internet environment, each household can use the internet simply by connecting a computer to the line already installed in each household in the multi-family dwelling, without having to install an internet line.

As such, the Internet can be used by using an IP network in a multi-family house, but in order to receive satellite, terrestrial, and cable broadcasts, a broadcast receiving antenna must be installed separately from the IP network or a coaxial cable line is required.

Recently, MDU set-top boxes have been developed that can receive broadcast signals over IP networks. However, it is more efficient not only to receive broadcasts by connecting MDU set-top boxes to individual internet lines installed in each household, but also to watch satellite, terrestrial and cable broadcasts in each household through IP networks installed in multi-family residences. There has been a need for a broadcast signal distribution system capable of receiving, distributing and managing broadcast signals.

In addition, an efficient method for receiving not only a broadcast signal but also information on an IP address for receiving a broadcast signal through an IP network has been required, and the configuration of a set-top box for receiving the broadcast signal is not complicated. There is a demand for a method of more efficiently processing and providing information.

An object of the present invention is to receive a broadcast signal through a single broadcast receiving antenna, assign an IP address to each channel to the broadcast signal, and then generate an IP mapping table containing information on the IP address of the broadcast signal for each channel. The present invention provides a broadcast signal distribution system for transmitting a broadcast signal and an IP mapping table signal to each MDU set-top box in a multicast manner through an IP network.

MDU broadcast signal distribution system of the present invention, a broadcast signal receiving unit for receiving a broadcast signal; The multi-channel signal included in the broadcast signal is divided into broadcast signals for each channel, an IP address is generated for each of the separated channels, an IP mapping table is generated, an MPEG signal including data of the IP mapping table is generated, and IP is generated. After assigning the preset IP address to the MPEG signal including the mapping table, applying the UDP protocol to the broadcast signal for each channel and the MPEG signal including the IP mapping table, recording and packetizing the unique IP address assigned to each MDU module for transmitting in a multicast method; A switch unit receiving the packet signal from the MDU module and distributing the signal into one or more signals; And connected to a switch unit, accesses an IP address of a preset IP mapping table, receives a packet signal containing an IP mapping table, extracts and stores an IP mapping table from the packet signal, and when a broadcast channel is selected by an external operation. An MDU set-top box that obtains an IP address corresponding to a broadcast channel by referring to an IP mapping table, receives a packet signal from the IP address corresponding to the broadcast channel, extracts the broadcast signal, and converts the signal into an A / V signal and outputs the external signal; It is configured to include.

In addition, in the MDU broadcast signal distribution system of the present invention, the MDU module includes a plurality of distribution modules for receiving and inputting a broadcast signal; Demultiplexer extracts MPTS from broadcast signal input through distribution module and demultiplexes it into SPTS and assigns IP address to each channel of demultiplexed broadcast signal to generate IP mapping table, and then generates MPEG signal containing IP mapping table. An IP mapping table generator for generating and assigning a predetermined IP address to the MPEG signal, and applying a UDP communication protocol to each of the demultiplexed broadcast signals and the IP mapping table signals to generate a packet signal containing a unique IP address. A TS-to-IP processing module including a protocol processing unit for generating; A control module for controlling to externally output the packet signal generated from the TS-to-IP processing module in a multicast manner; And a switch module connected to the switch unit and the IP network to transmit a packet signal to the switch unit.

In addition, the MDU set-top box in the MDU broadcast signal distribution system of the present invention, Ethernet port for receiving a packet signal from the switch unit; After accessing the IP address of the preset IP mapping table to receive the MPEG packet signal, the IP mapping table signal is extracted and decoded from the packet signal. When the broadcast channel is selected by the external input, the decoded IP mapping table is referred to. An IP mapping table recognizing unit for receiving a packet signal containing a broadcast signal from an IP address assigned to a broadcast channel; A central processing unit which extracts a broadcast signal from the packet signal and converts the broadcast signal into an MPEG processable signal; A tuner for directly receiving broadcast signals from the outside; A demultiplexer for demultiplexing the broadcast A / V data signals provided from the tuner and the central processing unit; A decoder for decoding the encoded IP mapping table signal received through the IP mapping table recognizer and decoding the demultiplexed broadcast A / V data signal through the demultiplexer; And an A / V output unit configured to output the decoded broadcast A / V data signal to the outside.

In addition, in the MDU broadcasting signal distribution system of the present invention, the switch unit is directly connected to the MDU module, receives a packet signal from the MDU module, sets an MDU set-top box that transmits an IGMP customer registration signal as a destination, and distributes the corresponding packet signal. One or more L3 switches for transmitting; And one or more L2 switches connected to the L3 switch and one or more MDU set-top boxes through an IP network to receive packet signals distributed from the L3 switch and to transmit them to an MDU set-top box set as a destination.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an overall block diagram of an MDU broadcast signal distribution system according to an embodiment of the present invention. As shown, the broadcast signal receiver 100, the MDU module 200, the switch 300, and the MDU set-top box 400 are illustrated. Equipped.

■ The broadcast signal receiving unit 100 is a device for receiving a broadcast signal transmitted from the outside is a dish-type antenna for receiving a satellite signal, and the like. At this time, the broadcast signal receiving unit can receive satellite broadcast signals such as DVB-S and DVB-S2, terrestrial wave, and cable broadcast signals.

The MDU module 200 receives a broadcast signal from the broadcast signal receiver 100 and separates a multi-channel signal carried in the broadcast signal into a broadcast signal for each channel. In addition, the MDU module 200 allocates an IP address to each broadcast signal separated for each channel, and generates an IP mapping table so that information about the broadcast signal for each channel and the IP address accordingly can be known.

The generated IP mapping table is converted into an MPEG signal through an MPEG encoding process. Since the IP mapping table should be transmitted to the set-top box first, the IP address is assigned to the preset IP address. That is, a fixed IP address is assigned by a promise with the set-top box, and the set-top box must also have an IP address for downloading an IP mapping table.

When the IP address is allocated to the broadcast signal and the IP mapping table for each channel through this process, the packetization process is performed by applying the UDP protocol to the broadcast signal and the signal for the IP mapping table for each channel. In addition, a unique IP address is recorded in each signal during packetization. This packetized packet signal is transmitted in a multicast manner.

The switch unit 300 receives the packet signal from the MDU module 200 and distributes the packet signal into one or more signals, and is divided into an L3 switch 310 and an L2 switch 320.

The L3 switch 310 is directly connected to the MDU module 200 and receives the packet signal from the MDU module 200 to distribute the packet signal to the LDU switch 320. In addition, the L2 switch 320 is directly connected to the set-top box and the Ethernet network receives a packet signal from the L3 switch 310 and transmits to the MDU set-top box 400.

At this time, when the L3 switch 310 receives the IGMP customer registration signal provided from the MDU set-top box 400 through the L2 switch 320, the MDU set-top box 400 is connected to the MDU set-top box 400 by setting a destination. The packet signal is transmitted to the L2 switch 320.

In this case, the Internet Group Management Protocol (IGMP) is a communication protocol for realizing IP multicast so that a router that receives a multicast packet transmits the packet to a LAN segment to which the PC is connected only when there is a PC that has declared reception in IGMP. It is. That is, the L3 switch 310 serving as a router transmits a packet signal only to an MDU set-top box that sends an IGMP customer registration signal.

When the L3 switch 310 transmits a packet signal in a multicast manner, there is no additional load other than exchanging an IGMP control signal with an MDU set-top box because the multicast IP is fixedly used. Therefore, compared with the case of using the Real-Time Streaming Protocol (RTSP) method, the load is not large.

■ The MDU set top box 400 is connected to the switch unit 300, and accesses a predetermined IP address in the MDU set top box 400 receives a packet signal containing an IP mapping table. That is, in the MDU set-top box 400, an IP address for downloading the IP mapping table should be stored in advance by an appointment. The IP mapping table is extracted from the received packet signal and stored.

When a broadcast channel is selected by an external operation such as a user's remote control, the user first finds an IP address corresponding to the selected broadcast channel by referring to the provided IP mapping table, receives the packet signal by accessing the obtained IP address, and then broadcasts the signal. After extracting, convert to A / V signal that can see and hear and output it externally.

Figure 2 is a block diagram showing the internal configuration of the MDU module according to a preferred embodiment of the present invention, as shown, MDU module 200, the distribution module 210, TS-to-IP processing module 220, control The module 230 and the switch module 240 are provided.

The distribution module 210 distributes and receives a plurality of broadcast signals received through the broadcast signal receiver 100. In the case of satellite broadcasting, broadcast signals are divided and transmitted for each transponder, and in order to process the signals transmitted from each transponder, a distribution module 210 corresponding to each transponder is preferably provided to separate the signals. Will be processed.

■ TS-to-IP processing module 220 is connected to each distribution module 210 receives the broadcast signal from the distribution module 210, SPTS by extracting the MPTS from the broadcast signal input through the distribution module 210 Demultiplexer 221 for demultiplexing with a decoded broadcast signal, each IP address is assigned to each channel of the demultiplexed broadcast signal to generate an IP mapping table, and then generates an MPEG signal containing the IP mapping table and assigns a preset IP address to it. IP mapping table generation unit 222, and a protocol processing unit 223 for generating a packet signal containing a unique IP address given by applying the UDP communication protocol to the demultiplexed broadcast signal for each channel and the IP mapping table signal do.

Looking at the role of each component of the TS-to-IP processing module 220 in more detail as follows.

The demultiplexer 221 receives a broadcast signal from the broadcast signal receiving unit 100 and receives a multi program transport stream (hereinafter referred to as MPTS) included in the broadcast signal as a single program transport stream (hereinafter referred to as SPTS). Demultiplex with That is, the broadcast signal includes several programs together, and performs a function of separating them into respective single program signals.

The IP mapping table generator 222 generates an IP mapping table by assigning an IP address to each broadcast signal of each channel of the broadcast signal. In the conventional analog channel selection, the broadcasting channel can be distinguished by specifying the frequency of the broadcasting channel.However, in order to provide a broadcasting signal through the IP network, different IP channels are assigned to different broadcasting channels. Create an IP mapping table to do this.

In addition, the IP mapping table generator 222 encodes the previously generated IP mapping table to generate an MPEG signal, and transmits the signal to which the IP mapping table is loaded so that the IP mapping table can receive the signal. Assign a separate IP address.

At this time, since the IP mapping table is information transmitted to the set top box prior to the broadcast signal, the set top box needs to know the IP address to which the IP mapping table is transmitted in order to download the IP mapping table. To do this, the set-top box must have a preset IP address to download the IP mapping table. In general, it is possible to recognize the IP address assigned to the IP mapping table in advance through the authentication card distributed by each broadcasting channel service or the IP address is fixed and stored in hardware from the set-top box release.

The protocol processor 223 packetizes the demultiplexed broadcast signal by applying a UDP communication protocol. UDP stands for User Datagram Protocol, and is a communication protocol that unilaterally transmits data on the Internet without going through a signaling procedure of receiving or receiving information. Although it is less stable in terms of stability than TCP (Transmission Control Protocol), the speed is much faster, so it is more effective to apply the UDP communication protocol to provide a streaming broadcast signal.

At this time, the protocol processor 223 packetizes not only the broadcast signal but also the signal containing the IP mapping table by applying the UDP communication protocol. At this time, each packet signal contains a unique IP address.

■ The control module 230 controls to externally output the packet signal generated from the TS-to-IP processing module 220 in a multicast manner. That is, the packetized broadcast signal and the IP mapping table previously generated are transmitted to the outside together, and the packet signal is transmitted in a multicast manner so that only the MDU set-top box belonging to a specific group subscribed to the service can be received.

■ The switch module 240 is connected to the switch unit 300 and the IP network, and transmits the packet signal generated by the TS-to-IP module 220 to the switch unit 300.

3 is a table showing the configuration of the IP mapping table generated in the MDU module according to an embodiment of the present invention, the contents of each field of the IP mapping table is shown in FIG.

As shown in the figure, the IP mapping table contains detailed information transmitted in a multicast manner, and the size of data can be variably generated so that it can be effectively transmitted not only in IPv4 but also in IPv6.

It also includes information about the type of service, an IP address for each broadcast channel, and an IP address for transmitting EPG information.

Figure 5 is a block diagram showing the internal configuration of the MDU set-top box according to an embodiment of the present invention, as shown, MDU set-top box 400 is Ethernet port 410, IP mapping table recognition unit 420, the center The processor 430 includes a tuner 440, a demultiplexer 450, a decoder 460, and an A / V output unit 470.

■ Ethernet port 410 receives the packet signal from the switch unit 300 via the Ethernet network.

The IP mapping table recognition unit 420 receives a packet signal through the Ethernet port 410 by accessing an IP address of a preset IP mapping table, and issues an IP mapping table from the received packet signal and performs a decoding processing command. . At this time, decoding is performed through the decoder 460 described below, and the decoded IP mapping table is stored in a separate area within the MDU set-top box 400.

When a broadcast channel is selected by an external input of the user, the broadcast A / V data signal is received from an IP address assigned to the selected broadcast channel with reference to the stored IP mapping table.

■ The central processing unit 430 extracts the broadcast signal from the packet signal received from the IP address assigned to the selected broadcast channel and converts the signal into an MPEG processable signal. That is, since the packet signal received through the Ethernet network is divided into packets and mixed with several signals, the MPEG signal is decoded to recover the signal before packetization so that the broadcast can be viewed.

■ The tuner 440 receives a broadcast signal directly from the outside separately from receiving a packetized broadcast signal through an Ethernet network, and may be selectively used in the present invention.

■ The demultiplexer 450 receives signals from the tuner 440 and the central processing unit 430 and demultiplexes them. In this case, the signal received by the demultiplexer 450 may be, for example, a signal recovered in the form of MPEG2-TS. As such, the configuration of the set-top box is simplified by connecting the Ethernet port 410 and the tuner 440 to the single demultiplexer 450 in the set-top box.

When the decoder 460 receives a decoding command from the IP mapping table recognition unit, the decoder 460 receives an MPEG signal including the IP mapping table and decodes the obtained MPEG signal to obtain an IP mapping table. In addition, the decoder 460 MPEG-decodes the demultiplexed broadcast signal through the demultiplexer 450 to obtain an original A / V broadcast signal. As such, the decoder 46 may be used for both decoding the IP mapping table and decoding the broadcast signal.

■ The A / V output unit 470 modulates the decoded A / V broadcast data signal into an A / V signal that can be recognized by a human, and outputs it to the outside so that the MDU set-top box user can watch the broadcast of the selected channel. .

6 is a flowchart illustrating an operation process between an MDU module and an L3 switch in detail according to a preferred embodiment of the present invention.

As shown, the MDU module 200 receives a broadcast signal such as DVB-S or DVB-S2.

Then, the MPTS carried in the broadcast signal is demultiplexed into SPTS to divide the signal into programs.

Next, the MPEG-TS signal extracted by demultiplexing is encapsulated in accordance with the UDP protocol, and converted into a packet signal, ready for transmission to the outside.

Finally, the operation process between the MDU module 200 and the L3 switch 310 is completed by externally transmitting the packetized signal according to the UDP protocol. In this case, 1000BASE-FX is used as the interface sent out from the MDU module.

7 is a flowchart illustrating an operation process between an L3 switch and an MDU set-top box in detail according to an exemplary embodiment of the present invention.

As shown, when the L3 switch 310 receives the IGMP customer registration signal from the MDU set-top box 400, an environment for transmitting the packet signal only to the MDU set-top box 400 registered by the IGMP protocol is provided. .

In addition, the L3 switch 310 transmits IP mapping data to the MDU set-top box 400 to select a broadcast channel in the MDU set-top box 400.

Thereafter, the L3 switch 310 transmits the broadcast A / V data packet signal and the broadcast information packet signal to the MDU set-top box 400 to complete the operation process between the L3 switch 310 and the MDU set-top box 400.

8 is a diagram illustrating a UDP data structure carrying MPEG-2 TS according to a preferred embodiment of the present invention.

As shown, the MPEG-2 TS signal has a size of 188 bytes per packet, and a total of seven MPEG-2 TS packets are carried in the payload region of one UDP packet.

As such, the MDU module 200 bundles seven broadcast signals in MPEG packet units and transmits the broadcast signals to the MDU set-top box 400 through the IP network.

Although the present invention has been described in more detail with reference to examples, the present invention is not necessarily limited to these examples, and various modifications can be made without departing from the spirit of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

According to the present invention, when the broadcast signal is provided to a multi-family house or building, the broadcast signal and the IP mapping table can be processed in the same manner, thereby simplifying the structure of the MDU module and the set-top box.

In addition, by transmitting the IP mapping table in a multicast manner through a preset IP address, the IP mapping table is provided only to the set-top box subscribed to the service, thereby preventing unnecessary data transmission.

Claims (4)

A broadcast signal receiver for receiving a broadcast signal; The multi-channel signal included in the broadcast signal is divided into broadcast signals for each channel, an IP address is generated for each of the separated channels, an IP mapping table is generated, and an MPEG signal including data of the IP mapping table is generated. And assigning a preset IP address to an MPEG signal including the IP mapping table, and applying a UDP protocol to the broadcast signal for each channel and the MPEG signal including the IP mapping table to record a unique IP address assigned to each. An MDU module for packetizing and transmitting the packet in a multicast manner; A switch unit which receives the packet signal from the MDU module and distributes the packet signal into one or more signals; And Connected to the switch unit, and accesses the IP address of the preset IP mapping table to receive a packet signal containing the IP mapping table, extracts and stores the IP mapping table from the packet signal, the broadcast channel is selected by an external operation The MDU obtains an IP address corresponding to the broadcast channel by referring to the IP mapping table, receives a packet signal from the IP address corresponding to the broadcast channel, extracts the broadcast signal, and converts the A / V signal to an external output. Set top box; MDU broadcast signal distribution system configured to include. The method of claim 1, The MDU module may include a plurality of distribution modules configured to receive the broadcast signals by inputting them; The demultiplexer extracts the MPTS from the broadcast signal input through the distribution module and demultiplexes the SPTS, and assigns an IP address to each channel of the demultiplexed broadcast signal to generate an IP mapping table, and then includes the IP mapping table. An IP mapping table generation unit for generating an MPEG signal and assigning a predetermined IP address to the MPEG signal, and applying a UDP communication protocol to the demultiplexed broadcast signal for each channel and the IP mapping table signal, respectively, to which a unique IP is assigned. A TS-to-IP processing module including a protocol processing unit for generating a packet signal containing an address; A control module for controlling to externally output the packet signal generated from the TS-to-IP processing module in a multicast manner; And A switch module connected to the switch unit via an IP network and transmitting the packet signal to the switch unit; MDU broadcast signal distribution system characterized in that it comprises a. The method according to claim 1 or 2, The MDU set top box, An Ethernet port for receiving a packet signal from the switch unit; Receives a packet signal by accessing an IP address of a preset IP mapping table, issues an IP mapping table signal from the received MPEG packet signal and issues a decoding process, and when the broadcast channel is selected by an external input, decoded IP. An IP mapping table recognition unit identifying an IP address assigned to the selected broadcast channel with reference to a mapping table, and receiving a packet signal according to the identified IP address; A central processing unit which extracts a broadcast signal from the received packet signal and converts the broadcast signal into an MPEG processable signal; A tuner for directly receiving broadcast signals from the outside; A demultiplexer for demultiplexing the broadcast A / V data signals provided from the tuner and the central processing unit; A decoder for decoding the encoded IP mapping table signal received through the IP mapping table recognizer and decoding the demultiplexed broadcast A / V data signal through the demultiplexer; And An A / V output unit configured to output the decoded broadcast A / V data signal to an outside; MDU broadcast signal distribution system characterized in that it comprises a. The method of claim 3, wherein The switch unit, At least one L3 switch connected directly to the MDU module to receive a packet signal from the MDU module, to set an MDU set-top box that has transmitted an IGMP customer registration signal as a destination, and to distribute and transmit the corresponding packet signal; And At least one L2 switch connected to an L3 switch and at least one MDU set-top box via an IP network and receiving a packet signal distributed from the L3 switch and transmitting the packet signal to an MDU set-top box configured as a destination; MDU broadcast signal distribution system characterized in that it comprises a.

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