KR20070061282A - Apparatus for transmitting and receiving broadcasting and communication data in interactive satellite communication system based on dvb-s2 - Google Patents

Abstract

An apparatus for transmitting/receiving broadcasting and communication data in an DVB-S2(Digital Video Broadcasting-Satellite 2)-based interactive satellite communication system is provided to maximize data transmission efficiency by directly transmitting IP(Internet Protocol) packets without using an MPE(Multi-Protocol Encapsulation)/MPEG-TS(Transport Stream) method. An apparatus for transmitting/receiving broadcasting and communication data in an interactive satellite communication system includes a backward link demodulator(12), a district center router(13), a broadcasting data generator(14), and a forward link modulator(15). The backward link demodulator demodulates and channel-decodes channel receiving state information of each terminal and backward link traffic data, which are received through a district center RF(Radio Frequency) processor for up-converting or down-converting the frequency of input data. The district center router is connected to the Internet(16) to transmit/receive IP packet based communication data. The broadcasting data generator generates broadcasting data in MPEG-TS packet form. The forward link modulator simultaneously splits the broadcasting data and the communication data into baseband frames and transmits the baseband frames by using a plurality of transmission methods. The forward link modulator allocates different transmission methods to respective terminals according to channel receiving state information of the terminals, simultaneously transmits a plurality of broadcasting streams through the different transmission methods, and maps and transmits the communication data inputted from the district center router through different transmission methods by using destination IP addresses.

Description

Apparatus for transmitting and receiving broadcasting and communication data in interactive satellite communication system based on DVB-S2}

1 is an overall configuration diagram of an embodiment of a broadcasting and communication data transmission / reception apparatus in a DVB-S2 based bidirectional satellite communication system according to the present invention;

2 is a detailed configuration diagram of an embodiment of a DVB-S2 forward link modulator in a transmitting apparatus (central station) in a DVB-S2 bidirectional satellite communication system according to the present invention;

3 is a detailed configuration diagram of an embodiment of a DVB-S2 forward link demodulator in a broadcasting and communication data receiving apparatus (terminal station) in a DVB-S2 bidirectional satellite communication system according to the present invention;

4 is a flowchart illustrating a DVB-S2 forward link modulation process of a DVB-S2 forward link modulator in a broadcast and communication data transmission apparatus according to the present invention;

5 is a flowchart illustrating a DVB-S2 forward link demodulation process of a DVB-S2 forward link demodulator in a broadcast and communication data receiving apparatus according to the present invention;

6 is a flowchart illustrating an embodiment of a broadcast and communication data transmission / reception process in a DVB-S2 based bidirectional satellite communication system according to the present invention.

* Explanation of symbols on the main parts of the drawing

10: transmitting apparatus 11: central station RF processing unit

12: reverse link demodulator 13: central station router

14: broadcast data generation unit 15: DVB-S2 forward link modulator

16: Internet 20: satellite

30: receiver 31: terminal station RF processing unit

32: DVB-S2 forward link demodulator 33: MPEG decoder

34: data processor 35: reverse link modulator

36: TV 37: user PC

The present invention relates to a broadcast and communication data transmission / reception apparatus in a DVB-S2-based bidirectional satellite communication system, and more particularly, to directly transmit an IP packet without using an MPE / MPEG-TS encapsulation scheme. Encapsulated transmission), maximizing data transmission efficiency, and at the same time, broadcasting and communication data in a DVB-S2-based two-way satellite communication system capable of processing communication data at high speed by using a conventional broadcast data reception method. It relates to a transmission / reception device.

In general, in order to use communication data in the form of an IP packet through an existing two-way satellite transmission system, a method of transmitting an encapsulation using a MPE / MPEG-2 TS (Transport Stream) packet structure and then transmitting it in a specific modulation scheme Was used. The Multi-Protocol Encapsulation (MPE) method is a method defined by Digital Video Broadcasting (DVB), a standardization organization for the European broadcasting transmission standard, to enable data broadcasting using a digital broadcasting network, for unicasting and multicasting. It is a method devised by applying data communication protocol to the concept of digital broadcasting. This MPE method is a proposed method for initially transmitting communication data using a digital broadcasting transmission / reception system, and processes communication data transmitted from a receiver through a broadcasting network in the same manner as data received through a communication network such as Ethernet. In order to be able to do this, the data communication protocol is applied to the digital broadcasting system. In general, the MPEG-TS format is used together to interwork with a digital broadcasting network, and the IP packet is encapsulated using the MPE scheme and then divided and recapsulated in the MPEG-TS standard and transmitted.

However, since the MPE / MPEG-2 TS packet encapsulation method inserts additional header information into a pure IP packet, it is generally known to generate 10% or more overhead, and it is known that an expensive transmission network or narrowband such as a satellite network is used. In applications that require efficient data transmission, such as mobile communication networks, this overhead leads to unnecessary cost increases.

For this reason, a method of directly sending an IP packet without encapsulating an MPE / MPEG-2 TS (Transport Stream) packet has been studied.In the early 2005, the DVB-S2 standard (Digital Video Broadcasting-Satellite 2) standard has an IP packet. It defines a stream that transmits directly without encapsulating.

However, since a method of transmitting communication data such as an IP packet to be normally received by a receiver without encapsulation and a procedure for receiving such an unencapsulated stream are not defined, a more specific method is required.

The present invention has been proposed to meet the above-mentioned requirements. By directly transmitting (non-encapsulated) the IP packet without using the MPE / MPEG-TS scheme, the terminal station maximizes the data transmission efficiency, It is an object of the present invention to provide a broadcast and communication data transmission / reception apparatus in a DVB-S2 based bidirectional satellite communication system for processing communication data at high speed using a conventional broadcast data reception method.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

The present invention for achieving the above object, in the broadcast and communication data transmission apparatus (hereinafter referred to as "transmitter") in the two-way satellite communication system, the central station RF processing means for up- or down-converting the frequency of the input data Reverse link demodulating means for demodulating and channel decoding channel station state reception information (SNR) and reverse link traffic data received through the terminal; A central station connecting means for transmitting / receiving IP packet-based communication data in association with an external Internet; Broadcast data generating means for generating broadcast data in the form of MPEG-TS packets; And transmitting broadcast data in the form of MPEG-TS packet and communication data based on IP packet by using a plurality of transmission schemes at the same time, separately transmitting them in baseband frame units, and transmitting the terminal station according to the channel reception status information (SNR) of each terminal station. Allocate different transmission methods for different transmission methods, transmit a plurality of broadcast streams simultaneously in different transmission methods, and map and transmit communication data in the form of IP packets input from the central station connecting means to different transmission methods using a destination IP address. Characterized in that it comprises a forward link modulation means.

In addition, the present invention, in the broadcast and communication data receiving apparatus (hereinafter, referred to as the "receiving apparatus") in the two-way satellite communication system, receiving through the terminal station RF processing means for up- or down-converting the frequency of the input data Mode and stream de-adaptation, demodulation and channel decoding are performed on the received baseband frame unit to output the broadcast data in the form of MPEG-TS packet and the communication data based on the IP packet to MPEG-TS packet. Forward link demodulation means for outputting the converted link; MPEG decoding means for demultiplexing broadcast and communication data in the form of MPEG-TS packets received from said forward link demodulation means; Data processing means for transmitting / receiving the communication data with a user terminal device connected to the receiving device (terminal station) and generating terminal station channel reception status information (SNR); And reverse link modulation means for modulating and channel coding the terminal station channel reception state information (SNR) and reverse link traffic data received from the data processing means and transmitting the same to the terminal station RF processing means.

According to the present invention, a transmission scheme suitable for each reception channel environment is provided for data transmitted to various terminal stations having different reception channel environments in a bidirectional satellite communication system that transmits existing satellite broadcast data and IP packet communication data according to the DVB-S2 standard. For transmission, communication data is transmitted in such a way that there is no overhead due to the existing MPE / MPEG-2 TS encapsulation. In the central station, broadcast data and IP packets in the form of a plurality of MPEG-TS packets can be transmitted. The form of communication data can be simultaneously transmitted using various transmission methods, and the terminal station can receive and process broadcast and communication data at a high speed by using an existing broadcast dedicated terminal device.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an overall configuration diagram of an embodiment of a broadcast and communication data transmission / reception apparatus in a DVB-S2 based bidirectional satellite communication system according to the present invention.

As shown in Fig. 1, a DVB-S2-based bidirectional satellite communication system is a central station (transmitting device) for transmitting communication data received from the Internet 16 to a terminal station (receiving device) 30 through a satellite 20. 10, the central station (transmitter) 10 and the terminal station (receiver) 30 are connected to each other to transmit / receive data between the central station (transmitter) 10 and the terminal station (receiver) 30. Satellite 20 for enabling reception, and a terminal station (receiving) for transmitting the communication data received from the central station (transmitter) 10 via the satellite 20 to a user PC 37 connected by a network. Device) 30.

First, the configuration of a broadcasting and communication data transmitting apparatus (hereinafter, referred to as a "transmitting apparatus") (central station) 10 in a DVB-S2-based bidirectional satellite communication system will be described in more detail. Demodulation and channel demodulation of reverse link data (terminal station channel reception status information (SNR) and reverse link traffic data) received through the central station RF processor 11 and the central station RF processor 11 for down-conversion A reverse link demodulator 12 for decoding, a central station router 13 connected to the external Internet 16 for transmitting / receiving communication data with the Internet 16, and broadcast data for generating broadcast data The unit 14 and the input broadcast and communication data is composed of a baseband (BB: BaseBand) frame according to the DVB-S2 standard, and determines the transmission method for each receiver (terminal station) 30, and various transmission Mo way And it consists of a stream adaptation, modulation and DVB-S2 forward link modulator 15 for performing channel coding.

The function of each component of the transmitting apparatus (central station) 10 having such a configuration will be described in more detail.

The central station RF processing unit 11 down-converts the frequencies of reverse link data (terminal station channel reception status information (SNR) and reverse link traffic data) received from the receiving apparatus (terminal station) 30 through the satellite 20. And transmits to the reverse link demodulator 12 and up-converts the frequency of broadcast and communication data received from the DVB-S2 forward link modulator 15 to the receiver (terminal station) 30 through the satellite 20. send.

The reverse link demodulation unit 12 transmits reverse link data (terminal station channel reception status information (SNR) and reverse link traffic data) transmitted from the receiving apparatus (terminal station) 30 through the satellite 20 to the central station RF processing unit ( 11) to perform demodulation and channel decoding, and to transmit the terminal station channel reception state information (SNR) of the reverse link data to the DVB-S2 forward link modulator 15.

The central station router 13 receives communication data in the form of an IP packet to be transmitted from the external Internet 16 to the receiving apparatus (terminal station) 30 and delivers it to the DVB-S2 forward link modulator 15.

The broadcast data generator 14 generates broadcast data and transmits the broadcast data to the DVB-S2 forward link modulator 15.

The DVB-S2 forward link modulator 15 bases the communication data received from the central station router 13 and the broadcast data received from the broadcast data generator 14 according to the DVB-S2 (Digital Video Broadcasting-Satellite 2) standard. A transmission scheme (modulation scheme and channel) that is configured in a band (BB) frame and is used for transmission to each receiver (terminal station) 30 based on channel reception state information (SNR) received from the reverse link demodulator 12. Coding method), and perform a mode and stream adaptation, modulation and channel coding on the baseband (BB) frame (broadcast and communication data) according to the determined transmission method (modulation method and channel coding method), Through the transmission to the receiving device (terminal) 30.

Meanwhile, when the broadcasting and communication data receiver (hereinafter, referred to as a "receiver") (terminal station) 30 in a DVB-S2-based bidirectional satellite communication system is described in more detail, the frequency of the input data is increased. Or mode and stream de-adaptation, demodulation, and channel decoding on the base station RF processor 31 for down-conversion and the baseband (BB) frame (broadcast and communication data) received through the terminal station RF processor 31. Broadcast and communication in the form of an MPEG-TS packet received from the DVB-S2 forward link demodulator 32 and the DVB-S2 forward link demodulator 32 for converting to an MPEG-TS packet form according to the DVB-S2 standard. MPEG decoder 33 for demultiplexing data such as PID (packet ID) filtering and section filtering, and communication data with a user PC 37 connected to a receiving device (terminal station) 30 And generating the terminal station channel reception status information (SNR). And a reverse link modulator 35 for modulating and channel coding the reverse link data (terminal channel reception state information (SNR) and reverse link traffic data) received from the data processor 34. It is composed.

The function of each component of the receiving device (terminal station) 30 having such a configuration will be described in more detail.

The terminal station RF processing unit 31 down-converts the frequency of the baseband (BB) frame (broadcast and communication data) received from the transmitting apparatus (central station) 10 through the satellite 20 to perform a DVB-S2 forward link demodulation unit. Transmitting to 32 and up-converting the frequency of the reverse link data (terminal channel reception state information (SNR) and reverse link traffic data) received from the reverse link modulator 34 and transmitting through the satellite 20. (Terminal) 10.

The DVB-S2 forward link demodulation unit 32 modulates the baseband (BB) frame (broadcast and communication data) received through the terminal station RF processing unit 31 according to the DVB-S2 standard. Decoding is performed to convert the MPEG-2 TS into the MPEG-2 Transport Stream (TP) packet format according to the DVB-S2 standard, and then delivers the result to the MPEG decoder 33.

The MPEG decoder 33 demultiplexes broadcast and communication data in the form of MPEG-TS packets received from the DVB-S2 forward link demodulator 32, such as PID filtering and section filtering, so that the broadcast data is transmitted to the TV 36. The communication data is transmitted to the data processor 34. At this time, a PID (Packet ID) for PID filtering on communication data is set by the terminal station operator.

The data processor 34 performs TS packet recombination on the communication data in the form of MPEG-TS packets received from the MPEG decoder 33, and then configures an MPE section to extract an IP packet stream. In addition, the IP forwarding function is used to transmit communication data to the user PC 37 through the Ethernet of the receiving device (terminal station) 30. To this end, an Ethernet header is generated in the extracted IP packet to the Ethernet frame. In this case, the destination hardware address to be used generates an Ethernet header using the hardware address of the receiver (terminal station) 30. In addition, the channel reception status of the reception apparatus (terminal station) 30 is determined to generate terminal station channel reception status information (SNR), and the generated terminal station channel reception status information (SNR) is received from the user PC 37. The reverse link traffic data is transmitted to the reverse link modulator 35.

In general, when the IP packet stream is configured as a baseband (BB) frame, communication data to be transmitted to various receivers (terminal stations) 30 are mixed in one baseband (BB) frame. If IP packets to be transmitted to another receiving device (terminal station) 30 are delivered to the user PC 37 via Ethernet, the TCP / IP (Transmission Control Protocol / Internet Protocol) protocol of the user PC 37 Since this is filtered within the IP packet delivery method will work normally.

At this time, the user PC 37 is a device that receives communication data to receive the actual service, and transmits / receives the communication data through the data processor 34.

The reverse link modulator 35 receives the reverse link traffic data and the terminal station channel reception state information (SNR) from the data processor 34, and performs modulation and channel coding to transmit the satellite signal.

FIG. 2 is a detailed configuration diagram of an embodiment of a DVB-S2 forward link modulator among transmission apparatuses (central stations) in a DVB-S2 bidirectional satellite communication system according to the present invention.

As shown in FIG. 2, the DVB-S2 forward link modulator 15 of the transmitting apparatus (central station) 10 transmits to each terminal station channel reception state information (SNR) received from the reverse link demodulator 12. Determines the transmission method (modulation method and channel coding method) to be used for transmission to each receiving device (terminal station) 30 according to the method, and determines the transmission method for each of the determined receiving device (terminal station) 30 and each receiving device (terminal station). Control information management unit 151 for managing the unique identification number (terminal station ID) assigned to 30 and destination IP address information of the user PC 37 mapped to the terminal station ID; A classification unit 152 for classifying by transmission method assigned to the corresponding receiving apparatus (terminal station) 30 according to a destination IP address of communication data in the form of IP packet of the information management unit 151, and classification Transmission queue of the IP packet type classified by the transmission unit 152 by transmission method (modulation method and channel coding method) A data accumulator 153 for accumulating, a data field generator 154 for configuring a baseband (BB) data field for transmitting broadcast data in the form of MPEG-2 TS packets on a frame-by-frame basis, and a data accumulator ( 153 and the data field generator 154 which cuts transmission data for each transmission scheme stored in a buffer of the data field generator 154 by a predefined transmission data field length, and accumulates data to be output (broadcast and communication data). Merger / Slicer unit 155 for determining the buffer of the data accumulation unit 153, baseband (BB) header generation unit 156 for constructing the baseband (BB) frame, and baseband (BB) frame DVB-S2 adaptive encoding / modulator 157 for modulation and channel coding.

The function of each component of the DVB-S2 forward link modulator 15 having the above configuration will be described in more detail.

First, in FIG. 2, it is assumed that the DVB-S2 forward link modulator 15 uses three transmission methods (modulation method and channel coding method).

Communication data in the form of IP packets are inputted through the central station router 13 and accumulated in the transmission queue in the data accumulation unit 153 by the classification unit 152 of the DVB-S2 forward link modulator 15. The broadcast data in the form of TS packet is input to the data field generation unit 154 for each transmission scheme through the number of transmission encoders determined by the system operator. At this time, each input port of the data field generation unit 154 is determined by a separate transmission method before operating the system.

Since the communication data in the form of IP packet input from the central station router 13 includes all the communication data transmitted to all the receiving apparatuses (terminal stations) 30 to which they are connected, they are the destination receiving apparatuses (terminal stations) 30. According to the terminal station channel reception status information (SNR) of the transmission scheme to be divided by, this function is performed by the classification unit 152.

The classification unit 152 should be used for IP address information of the user PCs 37 connected to a specific receiving device (terminal station) 30 provided from the control information management unit 151 and the corresponding receiving device (terminal station) 30. It is controlled by the transmission method information, this transmission method is determined by the control information management unit 151.

The control information management unit 151 based on the terminal station channel reception status information (SNR) transmitted from each receiving apparatus (terminal station) 30 through the reverse link demodulation unit 12 of the transmitting apparatus (central station) 10. The transmission method (modulation method and channel coding method) to be used for transmission to each receiving apparatus (terminal station) 30 is determined, and the classification unit 152 causes the destination of the communication data in the form of IP packet based on the determined transmission method information. Classify by different transmission method according to IP address.

The data field generator 154 for broadcast data in the form of MPEG-2 TS packet is composed of internal functional blocks defined in the DVB-S2 standard. It includes a cyclic redundancy check (CRC) encoder unit, an input synchronizer, a null packet remover, and a data buffer of a predetermined length in MPEG-TS units.

However, for communication data in the form of IP packets, these internal functional blocks do not exist and consist of a simple data buffer. Therefore, the communication data in the form of an IP packet is transmitted to the receiving device (terminal station) 30 through the satellite 20 as it is, without any separate encapsulation process.

The data input to each transmission method buffer is output by the Merger / Slicer unit 155. At this time, the slicer of the Merger / Slicer unit 155 is equal to the data length of the transmission data field defined for each transmission method. Is cut from the buffers of the data accumulator 153 and the data field generator 154, and Merger performs a function of determining which of several buffers to select for data output. . The functions of the slicer and the merger are controlled by the control information manager 151. Here, the priority of each transmission scheme may be defined and a high efficiency scheduling algorithm may be used.

Merger and Slicer output data for satellite transmission from the data field generator 154 for broadcast data in TS packet form and the data accumulator 153 for communication data in IP packet form. For example, a round robin scheme or other scheduling scheme may be applied. The DVB-S2 standard uses baseband (BB) frames to transmit broadcast and communication data. The baseband (BB) header generation unit 156 generates a baseband (BB) header including information indicating characteristics of the data field output by the Merger / Slicer unit 155, and generates a baseband (BB) data field. By adding the above, a baseband (BB) frame is constituted and modulated and channel coded by the DVB-S2 adaptive encoder / modulator 157 and transmitted to the satellite 20 through the central station RF processor 11.

When the baseband (BB) header output from the baseband (BB) header generation unit 154 is inserted into the data field output by the Merger / Slicer unit 155, a baseband (BB) frame is formed. In order to transmit a TS packet or an IP packet to one transport carrier using different transmission schemes, the input data stream is once again encapsulated.

The length of the baseband (BB) frame depends on the transmission method used, because the reason is to maintain a constant symbol rate while using different transmission methods. The length of the channel encoder output stream is 64800 bits. Alternatively, the length of the channel encoder input frame is differently defined according to the transmission method so that the length can be 16400 bits.

3 is a detailed configuration diagram of an embodiment of a DVB-S2 forward link demodulator among broadcasting and communication data receiving apparatuses (terminal stations) in a DVB-S2 bidirectional satellite communication system according to the present invention.

As shown in FIG. 3, the DVB-S2 forward link demodulator 32 performs DVB for demodulating and channel decoding baseband (BB) frames (broadcast and communication data) received through the terminal station RF processor 31. FIG. Extract baseband (BB) headers of baseband (BB) frames (broadcast and communication data) received from the S2 adaptive decoder / demodulator 321 and the DVB-S2 adaptive decoder / demodulator 321 A baseband (BB) header analyzer 322 for analysis, a first baseband (BB) frame processor 323 for outputting broadcast data in the form of MPEG-TS packets according to the DVB-S2 standard, and a baseband A second baseband (BB) frame processor 324 for receiving a GS stream (communication data) in the form of an IP packet from the (BB) header analyzer 322 and delivering the GS stream (communication data) to the MPEG-TS packet generator 325; Convert GS stream (communication data) in IP packet form into MPEG-TS packet form and demultiplexing And a MPEG-TS packet generating unit 325 for group.

The function of each component of the DVB-S2 forward link demodulator 32 having such a configuration will be described in detail.

The DVB-S2 adaptive decoder / demodulator 321 of the DVB-S2 forward link demodulator 32 demodulates baseband (BB) frames (broadcast and communication data) received from the transmitting apparatus (central station) 10, and Decoded channel is transmitted to the baseband (BB) header analyzer 322, the baseband (BB) header analyzer 322 is a baseband (BB) received from the DVB-S2 adaptive decoding / demodulator 321 Perform CRC-8 decoding on frames (broadcast and communication data), and if there are no errors, extract baseband (BB) headers from baseband (BB) frames (broadcast and communication data) to transmit baseband (BB) frames. Recognition method and data field length information and data format (MPEG-TS / GS) are transmitted to the first baseband (BB) frame processing unit 323 or the second baseband (BB) processing unit 324. . At this time, the baseband (BB) header analyzer 322 transmits the broadcast data in the form of MPEG-TS packet to the first baseband (BB) frame processing unit 323, and the GS stream (communication data) in the form of IP packet is Transfer to the second baseband (BB) frame processing unit 324.

The first baseband (BB) frame processing unit 323 performs functional blocks defined in the DVB-S2 standard such as CRC decoding, null-packet reinsertion, and 'Input Stream Synchronization' on broadcast data in the form of MPEG-TS packets. The broadcast data is transmitted to the MPEG decoder 33 in the form of an MPEG-TS packet.

Unlike broadcast data in the form of MPEG-TS packets, GS streams (communication data) in the form of IP packets cannot be processed by the MPEG decoder chip for digital broadcasting. Therefore, device drivers for data streams not encapsulated in the form of MPEG-TS packets can be processed. This must be done in software, such as, in general, this method is inadequate for high-speed data processing. In order to solve this problem, the DVB-S2 forward link demodulation unit 32 adds an MPEG-TS packet generation unit 325 to convert a GS stream (communication data) in the form of an IP packet into an MPEG-TS packet form and then convert the MPEG to a MPEG-TS packet. The decoder 33 delivers the data to the decoder 33, and the MPEG decoder 33 demultiplexes it such as PID filtering and section filtering, thereby enabling high-speed data processing.

Here, the MPEG-TS packet generation unit 325 is required to perform secondary conversion into MPEG-TS packet form after first converting GS stream (communication data) in IP packet form into TS packet form after converting to MPE form. When the TS packet is directly converted to an IP packet stream outputted with a baseband (BB) frame length of a certain length, a problem occurs during recombination in the data processing unit 34 of the receiving apparatus (terminal station) 30. Because of this, the first order transformation must be done in the form of MPE.

4 is a flowchart illustrating a DVB-S2 forward link modulation process of the DVB-S2 forward link modulator in the apparatus for transmitting broadcast and communication data according to the present invention.

First, the control information management unit 151 receives the terminal station channel reception status information (SNR) from the reverse link demodulator 12, and based on this, the control method to be used for transmission to each receiving apparatus (terminal station) 30. Determine (401).

Subsequently, the classification unit 152 transmits a transmission to be used when transmitting to the receiving device (terminal station) 30 stored in the control information management unit 151 according to the destination IP address of the communication data in the form of IP packet received from the central station router 13. The method information is checked and accumulated in the transmission queue of the data accumulator 153 for each transmission method, and the data field generator 154 accumulates the TS packet type broadcast data received from the MPEG-2 encoder for each transmission method ( 402).

Next, the Merger / Slicer unit 155 controls the IP packet type communication data received from the data accumulator 153 and the broadcast data of TS packet type received from the data field generator 154. The baseband (BB) header generator 156 cuts the broadcast and communication data accumulated in the selected buffer by selecting the buffer of the broadcast and communication data to be output according to the transmission data field length information defined for each transmission method stored in the block 403. (404).

Subsequently, the baseband (BB) header generation unit 156 generates a baseband (BB) header including information indicating characteristics of the broadcast and communication data fields output by the Merger / Slicer unit 155 (405). By adding the baseband (BB) data field in front of each other, a baseband (BB) frame is constructed and transmitted to the DVB-S2 adaptive encoding / modulator 157 (406).

Finally, the DVB-S2 adaptive encoder / modulator 157 modulates and channel-codes the baseband (BB) frame (broadcast and communication data) received from the baseband (BB) header generator 156 to perform the central station RF. The processor 11 transmits the data to the satellite 20 through the processor 11 (407).

5 is a flowchart illustrating a DVB-S2 forward link demodulation process of the DVB-S2 forward link demodulator in the apparatus for receiving broadcast and communication data according to the present invention.

First, the DVB-S2 adaptive decoder / demodulator 321 demodulates and channel decodes a baseband (BB) frame (broadcast and communication data) received from the transmitting apparatus (central station) 10 to perform a baseband (BB). The data is transmitted to the header analyzing unit 322 (501).

Subsequently, the baseband (BB) header analyzer 322 performs CRC-8 decoding on the baseband (BB) frame (broadcast and communication data) received from the DVB-S2 adaptive decoder / demodulator 321. 502, a baseband (BB) header is extracted from a baseband (BB) frame (broadcast and communication data) to transmit a baseband (BB) frame, and data field length information and data format according thereto (MPEG-TS); / GS) is transmitted to the first baseband (BB) frame processing unit 323 or the second baseband (BB) processing unit 324 (503).

At this time, the baseband (BB) header analyzer 322 transmits the broadcast data in the form of MPEG-TS packet to the first baseband (BB) frame processor 323, and the GS stream (communication data) in the form of IP packet is Transfer to the second baseband (BB) frame processing unit 324.

Subsequently, the first baseband (BB) frame processing unit 323 broadcasts in the form of MPEG-TS packet by performing CRC decoding, null-packet reinsertion, 'Input Stream Synchronization', etc. on the broadcast data in the form of MPEG-TS packet. The data is transmitted to the MPEG decoder 33, and the second baseband (BB) frame processing unit 324 delivers the GS stream (communication data) in the form of an IP packet to the MPEG-TS packet generation unit 325 to MPEG-TS. The packet is converted into a packet form and transferred to the MPEG decoder 33 (504).

6 is a flowchart illustrating an embodiment of a broadcast and communication data transmission / reception process in a DVB-S2 based bidirectional satellite communication system according to the present invention.

First, the central station router 13 of the transmitting apparatus (central station) 10 receives the communication data in the form of IP packet which should be transmitted from the external internet 16 to the receiving apparatus (terminal station) 30 and the DVB-S2 forward link. The broadcast data generator 14 generates the broadcast data and transmits the broadcast data to the DVB-S2 forward link modulator 15 (601).

Thereafter, the DVB-S2 forward link modulator 15 converts the communication data received from the central station router 13 and the broadcast data received from the broadcast data generator 14 into baseband (BB) frames according to the DVB-S2 standard. And determine a transmission method (modulation method and channel coding method) to be used for transmission to each receiving apparatus (terminal station) 30 based on the channel reception state information (SNR) received from the reverse link demodulator 12. According to the determined transmission method (modulation method and channel coding method), the baseband (BB) frame (broadcast and communication data) is performed through mode and stream adaptation, modulation, and channel coding, and received through the central station RF processor 11. And transmits to device (terminal station) 30 (602).

In addition, the DVB-S2 forward link demodulator 32 of the receiver (terminal station) 30 performs a mode and stream operation on the baseband (BB) frame (broadcast and communication data) received through the terminal station RF processor 31. Reverse adaptation, demodulation, and channel decoding are performed, and the result is converted into an MPEG-TS packet according to the DVB-S2 standard and transmitted to the MPEG decoder 33 (603).

Next, the MPEG decoder 33 demultiplexes the broadcast and communication data in the form of MPEG-TS packets received from the DVB-S2 forward link demodulator 32, such as PID filtering and section filtering, so that the broadcast data is TV. And outputs the communication data to the data processing section 34 (604).

Thereafter, the data processing unit 34 determines the channel reception state of the receiving apparatus (terminal station) 30 to generate the terminal station channel reception state information (SNR), and transmits the communication data received from the MPEG decoder 33 to the user PC. And transmits the reverse link traffic data received from the user PC 37 and the generated terminal station channel reception status information (SNR) to the reverse link modulator 35 (605).

Finally, the reverse link modulator 35 receives the reverse link data (terminal station channel reception state information (SNR) and reverse link traffic data) from the data processor 34, and modulates and channel codes the terminal station. The RF processor 31 transmits the data to the transmitter 10 (central station) 10 (606).

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

As described above, the present invention, in the bidirectional satellite communication system based on the DVB-S2 standard, replaces the existing IP packet transmission method and receives such data from a non-encapsulated transmission method and a receiving device (terminal station) at high speed. By presenting a method that can be processed, it is possible to increase the transmission efficiency in a system using expensive satellites.

Claims (9)

In the broadcasting and communication data transmission apparatus (hereinafter referred to as "transmitter") in the two-way satellite communication system, Reverse link demodulation means for demodulating and channel decoding each station station channel reception state information (SNR) and reverse link traffic data received through a central station RF processing means for up- or down-converting the frequency of input data; A central station connecting means for transmitting / receiving IP packet-based communication data in association with an external Internet; Broadcast data generating means for generating broadcast data in the form of MPEG-TS packets; And Broadcast data in the form of MPEG-TS packets and communication data based on IP packets are simultaneously transmitted in baseband frame units using a plurality of transmission schemes, and are transmitted for each terminal station according to the channel reception state information (SNR) of each terminal station. Assigning different transmission schemes, transmitting multiple broadcast streams simultaneously in different transmission schemes, and mapping and transmitting communication data in the form of IP packets input from the central station connecting means to different transmission schemes using destination IP addresses. Forward link modulating means Broadcast and communication data transmission apparatus in a DVB-S2 based bidirectional satellite communication system comprising a. The method of claim 1, The forward link modulation means, Determining the transmission method to be used for transmission to each receiving apparatus (terminal station) according to the channel reception status information (SNR) of each terminal station received from the reverse link demodulation means, and transmitting method for each determined receiving apparatus (terminal station) Control information management means for managing a unique identification number (terminal ID) assigned to the apparatus (terminal station) and destination IP address information of the user PC mapped to the terminal station ID; Classification means for classifying, by the control information management means, for each transmission scheme assigned to each receiving apparatus (terminal station); Data accumulation means for accumulating the communication data in the classified IP packet form in a transmission queue for each transmission method; Data field generating means for constructing a baseband data field to transmit broadcast data in the MPEG-2 TS packet format frame by frame; The data field generating means and the data in which transmission data for each transmission method stored in a buffer of the data accumulating means and the data field generating means are cut by a predetermined transmission data field length, and data to be output (broadcast and communication data) are accumulated. Cutting / determining means for determining a buffer of the accumulating means; Baseband header generating means for constructing a baseband frame; And DVB-S2 adaptive coding / modulation means for modulating and channel coding the baseband frame Broadcast and communication data transmission apparatus in a DVB-S2 based bidirectional satellite communication system comprising a. The method of claim 2, The data accumulation means, Broadcast and communication data transmission apparatus in a DVB-S2 based two-way satellite communication system characterized in that one transmission queue is operated for each transmission method. The method of claim 3, wherein The cutting / determining means, Broadcast and communication data transmission apparatus in the DVB-S2 based two-way satellite communication system, characterized in that for defining the priority by the transmission scheme. The method of claim 4, wherein The baseband header generating means, Broadcasting and communication data transmission apparatus in a DVB-S2 based bidirectional satellite communication system, characterized in that for generating a baseband header indicating the characteristics of the data field, in addition to the baseband data field in front of the baseband frame. In the broadcasting and communication data receiving apparatus (hereinafter, referred to as "receiving apparatus") in the two-way satellite communication system, Mode and stream de-adaptation, demodulation and channel decoding are performed on the baseband frame-based broadcast and communication data received through a terminal station RF processing means for up- or down-converting the frequency of the input data. Forward link demodulation means for outputting in the form of TS packet and converting the communication data based on IP packet into MPEG-TS packet; MPEG decoding means for demultiplexing broadcast and communication data in the form of MPEG-TS packets received from said forward link demodulation means; Data processing means for transmitting / receiving the communication data with a user terminal device connected to the receiving device (terminal station) and generating terminal station channel reception status information (SNR); And Reverse link modulation means for modulating and channel coding terminal station channel reception state information (SNR) and reverse link traffic data received from the data processing means and transmitting the same to the terminal station RF processing means. Broadcast and communication data receiving apparatus in a DVB-S2 based bidirectional satellite communication system comprising a. The method of claim 6, The forward link demodulation means, DVB-S2 adaptive decoding / demodulation means for demodulating and channel decoding baseband frames (broadcast and communication data) received through the terminal station RF processing means; Baseband header analyzing means for extracting and analyzing a baseband header of a baseband frame (broadcast and communication data) received from the DVB-S2 adaptive decoding / demodulation means; First baseband frame processing means for outputting broadcast data in the form of MPEG-TS packets according to the DVB-S2 standard; And MPEG-TS packet generation means for receiving the GS stream (communication data) in the form of IP packet from the baseband header analyzing means and converting it into an MPEG-TS packet form through a second baseband frame processing means. Broadcast and communication data receiving apparatus in a DVB-S2 based bidirectional satellite communication system comprising a. The method of claim 7, wherein The baseband header analysis means, A first baseband frame processor or a second baseband processor by recognizing a baseband header of the extracted baseband frame and a data field length information and a format (MPEG-TS / GS) according to the transmission scheme of the baseband frame. Broadcast and communication data receiving apparatus in a DVB-S2 based bidirectional satellite communication system, characterized in that for transmitting to. The method of claim 8, The MPEG-TS packet generation means, An apparatus for receiving broadcast and communication data in a DVB-S2-based two-way satellite communication system, characterized in that the GS stream (communication data) in the IP packet form is first converted into the MPE form and then converted into the MPEG-TS packet form.

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