KR100404757B1 - A satellite asynchronous transfer mode matching apparatus for transferring an internet and a video data to satellite network and the matching method thereof - Google Patents

Abstract

The present invention relates to a satellite AT matching device for transmitting the Internet and video data to a satellite network and a method for matching the same, wherein the received frame or frame is connected for connection between a terrestrial ATM network and an internet network and a video transmission network. A line matching unit for synchronizing packets and transmitting a corresponding frame or packet generated by an AT network, an internet network, and a video transmission network; A cell / frame processor configured to receive a frame or packet transferred from the line matcher to generate an AT cell or to process a valid cell to generate a new frame; A PIPO processing unit which receives an AT cell generated from the cell / frame processing unit and stores the state of at least one FIFO; And a multiplexing / demultiplexing processing unit which receives the status determination result of the PIPO from the PIPO processing unit, multiplexes an AT cell according to the traffic characteristics, or demultiplexes a cell received from the outside to deliver to the PIPO processing unit. do.

The present invention increases the transmission efficiency by discarding the AMT cells transmitted in advance when the pipo overflows according to the state of the satellite network, and by collecting the state information of the PIPO to perform multiplexing or demultiplexing of the ATM cells at high speed. In addition to ATM data, the Internet and video data can be transmitted to the satellite network.

Description

SATELLITE ASYNCHRONOUS TRANSFER MODE MATCHING APPARATUS FOR TRANSFERRING AN INTERNET AND A VIDEO DATA TO SATELLITE NETWORK AND THE MATCHING METHOD THEREOF}

The present invention relates to an Asynchronous Transfer Mode (ATM) matching device, and in particular, a satellite ATM matching for multiplexing and transmitting not only terrestrial ATM data to a satellite network but also internet and video data having various data rates and different traffic characteristics. An apparatus and a matching method thereof.

Conventionally, it is possible to transmit terrestrial ATM cells to satellites by interfacing satellite networks with terrestrial ATM networks, taking advantage of the advantages of ease of network configuration, wide area, disaster resistance, and back-up of terrestrial networks. there was.

Currently, research and development are being actively conducted to provide or service some of the internet data or video data, which has been exploding in recent years, through the satellite network by using the broadband and wide coverage characteristics of satellites.

However, since each service is still performed independently and the transmission band of the satellite is fixed, there is a problem that the bandwidth is not used efficiently and the band is wasted when the traffic to be transmitted is small.

In order to solve such a problem, the technical problem to be achieved by the present invention is to achieve the use of the transmission bandwidth of the satellite network of the terrestrial network has a different traffic characteristics (CBR, Constant Bit Rate), Internet data ( An object of the present invention is to provide a satellite AT matching device capable of multiplexing UBR (Undefined Bit Rate) and video data (VBR, Variable Bit Rate).

In addition, depending on the state of the satellite network, traffic control that can effectively discard the cell when the first in first out (FIFO) overflows, multiplexing according to the state of the PIPO, demultiplexed virtual connection (VC) Another purpose is to demultiplex a cell at high speed according to a table.

1 is a block diagram illustrating a satellite AT matching device for transmitting Internet and video data to a satellite network according to an exemplary embodiment of the present invention.

2 is a diagram illustrating a method of SAR processing an MPEG-2 transport stream using the AAL5 method.

3 is a diagram illustrating a method of SAR processing an Ethernet frame using the AAL5 method.

*** Explanation of symbols for main parts of drawing ***

110: video line matching unit 120: AMT line matching unit

130: internet line matching unit 210: video SAR processing unit

220: AMT processing unit 230: Internet SAR processing unit

310 to 330: Pipo 340 to 360: Pipo control unit

400: multiplexing and demultiplexing unit 410: multiplexing control unit

420: demultiplexed VC table 430: multiplexed table

Satellite AMT matching device for transmitting the Internet and video data to the satellite network according to one feature of the present invention for achieving the above object,

Line for synchronizing the received frame or packet and connecting the frame or packet generated by the AT network and the video transmission network for the connection between the terrestrial ATM network and the internet network and the video transmission network. Matching part;

A cell / frame processor configured to receive an frame or packet transmitted from the line matcher to generate an AT cell or to process a valid cell to generate a new frame;

A PIPO processing unit which receives and stores an AT cell generated from the cell / frame processing unit and grasps a state of at least one FIFO in a traffic state; And

The multiplexing / demultiplexing processing unit receives the result of determining the status of the PIPO from the PIPO processing unit, multiplexes an AT cell according to the characteristics of traffic, or demultiplexes a cell received from the outside to deliver to the PIPO processing unit

It includes.

According to another aspect of the present invention, a satellite AT matching method for transmitting Internet and video data to a satellite network is provided.

Synchronize a frame or packet received from each access network to access the terrestrial ATM network, the internet network, and the video transmission network, and transmit the corresponding frame or packet generated by the AT network, the internet network, and the video transmission network. Transmitting;

Receiving an transmitted frame or packet to generate an AT cell or processing a valid cell to generate a new frame;

Controlling traffic and cell multiplexing according to respective transport network traffic conditions; And

Multiplexing or transmitting multiplexed AMT cells according to the characteristics of the traffic

It includes.

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

1 is a block diagram illustrating a satellite AT matching device for transmitting Internet and video data to a satellite network according to an exemplary embodiment of the present invention.

As shown in FIG. 1, the satellite AT matching device according to an embodiment of the present invention includes a line matching unit 100 for accessing a terrestrial ATM network, an internet network, and a video transmission network; A cell / frame processing unit 200 receiving the data transmitted from the line matching unit 100 to generate an ATM cell or processing a valid cell to generate a new frame; From the data inputted from the cell / frame processing unit 200, traffic and cell multiplexing are performed by identifying the state of each FIFO 310, 320, 330 that stores ATM cells and discards the cells according to traffic conditions. A multi-PIPO control unit 300 including a FIFO control unit 340, 350 and 360 for controlling; A multiplexing and demultiplexing unit 400 for multiplexing and demultiplexing ATM cells; A multiplexing control unit 410 that collects state information of the FIFO from each FIFO control unit 340, 350, and 360 and controls cell multiplexing by the multiplexing table 430; And a demultiplexing VC table 420 used when demultiplexing ATM cells by VPI / VCI values.

The line matching unit 100 synchronizes the MPEG-2 transport stream packet to the video segment and reassembly processing unit 210, or transmits the MPEG-2 transport stream packet received from the video SAR processing unit 210 to the video again. A video line matching unit 110 transmitting the transmission network; An AMT line matching unit 120 for obtaining an ATM frame synchronization and transmitting a frame to the ATM processing unit 220 or transmitting an ATM frame received from the AMT processing unit 220 to a terrestrial AT network; And an internet line matching unit 130 for acquiring frame synchronization of the Ethernet input at a variable transmission rate and transmitting it to the Internet SAR processing unit 230 or transmitting the Ethernet frame received from the Internet SAR processing unit 230 to a terrestrial Internet network. Include.

The cell / frame processing unit 200 generates an MPEG-2 transport stream from an MPEG-2 transport stream by generating ATM cells or collecting ATM cells by AAL5. Reassembly, hereinafter referred to as SAR) processor 210; An ATM processor 220 which removes the overhead and empty cells of the frame to extract only valid cells or inserts empty and overhead cells into the valid cells to generate a frame; And an internet SAR processor 230 for generating an AT cell from the Ethernet frame by AAL5 or generating an Ethernet frame by collecting the ATM cells.

Hereinafter, the operation of the satellite AT matching device for transmitting the Internet and video data to the satellite network according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a diagram illustrating a method of SAR processing an MPEG-2 transport stream using the AAL5 method, and FIG. 3 is a diagram illustrating a method of SAR processing the Ethernet frame using the AAL5 method.

The video line matching unit 110 synchronizes the MPEG-2 transport stream packet input from the outside and transmits the same to the video SAR processing unit 210. In this case, line matching standards for transmitting and receiving MPEG-2 transport streams for video transmission networks include SMPTE, DVB-ASI, DVB-SSI, DVB-SPI, and the like.

The video SAR processing unit 210 receives the synchronized MPEG-2 transport stream packet, and binds two 188-byte MPEG-2 transport stream packets in the AAL5 method as shown in FIG. 2 to attach a CPCS-PDU payload. After forming a total of eight AT cells. The VPI (Virtual Path Identifier) / VCI (Virtual Channel Identifier; VCI) of the header is used for routing information when demultiplexing. In addition, message start, message continuity, and end of message information are inserted into the PT field of the standard AT cell header and used to determine the start cell and the last cell when combining the AT cell into an MPEG-2 transport stream packet. The video SAR processing unit 210 conversely combines eight ATM cells received from the PIPO 310 into two MPEG-2 transport stream packets, and combines the cells to generate MPEG-2 transport stream packets. If there is a cell lost in the middle due to the error of the satellite channel, all eight cells (that is, two MPEG-2 transport stream packets) are discarded.

Typically, to support various kinds of services with different traffic characteristics and system requirements, it is necessary to adapt different classes of applications to the ATM layer, which is performed by the ATM Adaption Layer (AAL). In addition, the AAL5 supports a connection-oriented service having a variable transmission rate. This is a simplified AAL that eliminates error recovery and retransmission functions compared to AAL3 / 4. This reduces bandwidth overhead, simplifies processing requirements, and reduces implementation complexity. Typically, the AAL consists of a convergence sublayer (CS) and a segmentation and reassembly (SAR) sublayer, and the CS is composed of a common part CS (CPCS) and a service specific part CS (SSCS). SAR segments, which are higher layer PDUs, are fed to the ATM layer to generate 53 byte cells. CPCS provides services such as padding and CRC checking, which takes one SSCS PDU, fills it if necessary and adds an 8 byte trailer so that the overall length of the resulting PDU is a multiple of 48. For an 8 byte long trailer, 2 bytes are reserved, 2 bytes are used to indicate packet length, and 4 bytes are used for CRC. SSCS provides services such as guaranteed data transmission, which are service dependent and retransmission based.

The VPI is an 8-bit field in the header of an ATM cell that is an identifier used with the VCI to determine the next receiving device of the cell as it moves through the series of ATM switches as it travels to the receiving device. The VCI is a 16-bit long field in the header of an ATM cell that is used to find the next receiving device of the cell while the cell moves to the receiving device and passes through a series of ATM switches. Typically, the ATM switch uses the VPI / VCI field to find out the VCL of the next network that the cell must pass on its way to the final receiver.

Subsequently, the AMT line matching unit 120 transmits the frame obtained by obtaining the ATM frame synchronization to the ATM processing unit 220. The AT processor 220 removes frame overhead and empty cells from the frame received from the AT line matching unit 120 and extracts only valid cells. On the contrary, the AT processor 220 inserts an empty cell and an overhead into the effective cell received from the PIPO 320, generates a frame, and transmits the frame to the AT line matching unit 120. 120 transmits the AT frame received from the AT processor 220 to the terrestrial AT network.

Subsequently, the internet line matching unit 130 obtains the frame synchronization of the Ethernet input at a variable data rate and transmits it to the Internet SAR processing unit 230. As shown in FIG. 3, the Internet SAR processing unit 230 separates the Ethernet frame of variable length by the AAL5 scheme and generates a total of N AT cells. The VPI / VCI of the header is used as the routing information when demultiplexing by assigning a unique value when generating the AT cell. In addition, message start, message continuity, and message end information are inserted into the PT field of the standard AT cell header to be used to determine the start cell and the last cell when combining the AT cell again into an Ethernet frame. At this time, when generating the Ethernet frame by combining the cells, if there is a cell lost in the middle due to the error of the satellite channel, the Internet SAR processing unit 230 discards all n cells (that is, one Ethernet frame). On the contrary, the Internet SAR processing unit 230 generates an Ethernet frame by tying an AT cell input from the PIPO 330 and transmitting the generated Ethernet frame to the Internet line matching unit 130, and the Internet line matching unit 130 is an Internet SAR processing unit ( The Ethernet frame received in 230 is transmitted to the terrestrial Internet network.

Each PIPO 310, 320, 330 stores 53 bytes of AMT cells and inputs and outputs cells. In the case of the video cell and the terrestrial ATM cell, the thresholds of the PIPOs 310 and 320 are set as primary and secondary so that multiplexing control is performed according to traffic conditions. If there is no data in each PIPO, the cells are transmitted. I never do that. In this case, each of the PIPO controllers 340, 350, and 360 collects the states of the PIPOs 310, 320, and 330 and informs the multiplexing controller 410 of the PIPO state.

Each of the PIPO controllers 340, 350, and 360 has counters, so that the cells are inputted to each of the PIPOs 310, 320, and 330, and increased by one.

The multiplexing and demultiplexing unit 400 sequentially multiplexes the cells of the PIPOs 310, 320, 330 in a round robin manner before reaching the first thresholds of the PIPOs 310, 320 in the case of the video cell and the terrestrial AT cell. In this case, if the PIPO 310,320 reaches the first threshold, the control is performed so as not to exceed the first threshold of PIPO by transmitting the video cell or the terrestrial AT cell in the cell transmission order of the Internet.

Since satellite channels have a long transmission delay (270 msec) in nature, terrestrial AMT cells or video data should be transmitted like real-time services, and Internet data can be serviced even if transmission is slightly delayed. However, in spite of this method, the cells in which the PIPO 310,320 overflows beyond the first threshold to the second threshold must be discarded.

In the case of video data, it is more efficient to discard all eight cells that have been converted by the video SAR processing unit 210 rather than discarding cells overflowed in the PIPO one by one. The reason is that when the satellite network receives the cell and the video SAR processing unit 210 combines the cells to generate the MPEG-2 transport stream packet, if there is a lost cell in the middle, all eight cells (that is, the MPEG-2 trans This is because two port stream packets) are discarded. Thus, by discarding a cell in advance in anticipation of this, it is possible to prevent unnecessary cell transmission and to easily manage a PIPO.

In the case of terrestrial AT cells, if the PIPO 320 exceeds the secondary threshold, the cell whose Cell Loss Priority (CLP) bit value of the header is 1 is discarded first among the cells stored in the PIPO, and the Cell Loss Priority (CLP) bit value This zero cell is left in the PIPO to be transmitted.

In case of Internet data, the PIPO 330 does not set a threshold and discards overflowing cells when an overflow occurs. When discarding a cell, the entire cell generated from an Ethernet frame is discarded instead of one by one. The reason is that when the cell is received from the satellite network and the Internet SAR processing unit 230 combines the cells to generate an Ethernet frame, if there is a cell lost in the middle, all n cells (that is, one Ethernet frame) are discarded. This is because, in anticipation of such a situation, by discarding the cell in advance, it is possible to prevent unnecessary cell transmission and to easily manage the PIPO.

The multiplexing controller 410 collects the PIPO state information from each of the PIPO controllers 340, 350, and 360 and controls the multiplexing cell using the multiplexing table 430 as shown in Table 1 below. Here, since the video cell has the traffic characteristics of VBR, the AT cell is CBR, and the Internet cell is UBR, the video cell and the AT cell have high transmission priority for real-time service, and the Internet cell has the lowest priority.

S0 Video-> ATM-> Internet-> Video-> ATM-> Internet S1 Video-> ATM-> Video-> Video-> ATM-> Internet S2 Video-> ATM-> ATM-> Video-> ATM-> Internet S3 Video-> ATM-> Video-> Video-> ATM-> AMT

Normally, the cells of the pipes 310, 320, and 330 are sequentially multiplexed in a round robin manner in the SO state. When the PIPO 310 of the video data reaches the threshold, it is multiplexed to the S1 state, and when the PIPO 320 of the AT cell reaches the threshold, it is multiplexed to the S2 state. When the video data and the PIPO of the AT cell simultaneously reach the threshold, the data is multiplexed to the S3 state.

In response to a control signal of the multiplexing control unit 410, the multiplexing and demultiplexing unit 400 receives cells from the respective piezos 310, 320, and 330 with reference to the piezo state of the multiplexing table 430. On the contrary, in the demultiplexing of the input data, the multiplexing and demultiplexing unit 400 stores the VPI / VCI value stored in the demultiplexing VC table 420 and the VPI / VCI value of the AMT cell header received from the satellite network. In comparison, the cells are demultiplexed with the corresponding PIPOs 310, 320, and 330. In this case, the demultiplexed VC table 420 stores only the VPI / VCI information allocated to the video data and the Internet data, and does not store the VPI / VCI information used in the terrestrial AT cell which occupies much memory. Cells other than the corresponding VPI / VCI value are demultiplexed to the terrestrial ATMP pipo 320. Through this, the memory size of the demultiplexed VC table 420 can be reduced, and cell demultiplexing is possible at a high speed.

The embodiments of the present invention described above are merely one embodiment, and many modifications and changes are possible without departing from the gist of the present invention, and the present invention is not limited to the embodiments.

As described above, the satellite AT matching device and the matching method for transmitting the Internet and video data to the satellite network of the present invention by discarding the AMT cells transmitted in advance when the pipo overflows according to the state of the satellite network to improve the transmission efficiency It can increase the number of PIPO status and multiplex ATM cells or demultiplex at high speed by demultiplexing VC table with low memory capacity to transmit not only terrestrial ATM data but also internet and video data to satellite network. have.

Claims (14)

Line for synchronizing the received frame or packet and connecting the frame or packet generated by the AT network and the video transmission network for the connection between the terrestrial ATM network and the internet network and the video transmission network. Matching part; A cell / frame processor configured to receive an frame or packet transmitted from the line matcher to generate an AT cell or to process a valid cell to generate a new frame; A pipo processing unit which receives and stores an AT cell generated from the cell / frame processing unit and grasps a state of one or more FIFOs; And The multiplexing / demultiplexing processing unit receives the result of determining the status of the PIPO from the PIPO processing unit, multiplexes an AT cell according to the characteristics of traffic, or demultiplexes a cell received from the outside to deliver to the PIPO processing unit Satellite AT matching device for transmitting the Internet and video data to a satellite network comprising a. The method of claim 1, wherein the line matching unit A video line matching unit which synchronizes and transmits MPEG-2 transport stream packets or transmits received MPEG-2 transport stream packets to a video transmission network; An ATM line matching unit for acquiring and transmitting an ATM frame synchronization or transmitting the received AMT frame to the ATM network; And Internet line matching unit that acquires and transmits frame synchronization of Ethernet input at variable data rate or transmits received Ethernet frame to Internet network Satellite AT matching device for transmitting the Internet and video data to a satellite network comprising a. The method of claim 1, wherein the cell / frame processing unit The AMT cell is generated from an MPEG-2 transport stream transmitted from the video line matching unit by an AAL5 method, or the AMT cells are collected to generate an MPEG-2 transport stream to the video line matching unit. Video SAR processing unit for transmitting; Remove the overhead and empty cells of the frame transmitted from the AT line matching unit to extract only the effective cells, or insert the empty cells and overhead in the effective cell to generate the frame to transfer to the AT line matching unit Processing unit; And An internet SAR processor for generating an AT cell by an AAL5 method based on the Ethernet frame transmitted from the internet line matching unit, or generating an Ethernet frame by collecting the AT cells, and transmitting the generated Ethernet frame to the internet line matching unit. Satellite AT matching device for transmitting the Internet and video data to a satellite network comprising a. The method of claim 1, wherein the PIPO processing unit At least one PIPO for storing ATM cells inputted from the cell / frame processing unit and discarding the cells according to traffic conditions; One or more PIPO controllers to determine the status of the PIPO to control traffic and cell multiplexing Satellite AT matching device for transmitting the Internet and video data to a satellite network comprising a. The method of claim 1, wherein the multiplexing / demultiplexing unit A multiplexing table storing multiplexing ranks according to traffic characteristics of video cells, AT cells and Internet cells according to the PIPO status information from the PIPO control unit; A demultiplexing table used when demultiplexing the AMT cells by VPI / VCI values; A multiplexing control unit which collects state information of the pipo from the pipo control unit and controls cell multiplexing by the multiplexing table; And Multiplexing and demultiplexing unit for multiplexing and transmitting ATM cells and demultiplexing the AT cells received from the outside through the demultiplexing table Satellite AT matching device for transmitting the Internet and video data to a satellite network comprising a. The method of claim 1 or 5, wherein the multiplexing and demultiplexing unit If the pipo of the video data and the ETIM cell does not reach the threshold, it is sequentially multiplexed into the video, AT, internet, video, AT, and internet states by a round robin method. When the pipo of video data reaches a threshold, it is sequentially multiplexed into video, ATM, video, video, ATM, and the Internet. When the PIPO of the AT cell reaches the threshold, it is sequentially multiplexed into the video, AT, AT, video, AT, and internet states. When the video data and the PIPO of the AT cell simultaneously reach the threshold, the satellite A for transmitting the Internet and the video data to the satellite network, characterized in that it is sequentially multiplexed into the video, AT, video, video, AT, and ATM states. Timing matching device. The method of claim 1 or 5, wherein the multiplexing and demultiplexing unit The VPI / VCI value stored in the demultiplexing table is compared with the VPI / VCI value of the AT cell header received from the satellite network to demultiplex the PPI cell, and the video data and the Internet are demultiplexed. Transmit internet and video data to satellite network, which stores VPI / VCI information allocated to the data and demultiplexes all non-VPI / VCI values corresponding to video data and internet data to ATMP PIPO. Satellite AT matching device. Synchronize a frame or packet received from each access network to access the terrestrial ATM network, the internet network, and the video transmission network, and transmit the corresponding frame or packet generated by the AT network, the internet network, and the video transmission network. Transmitting; Receiving an transmitted frame or packet to generate an AT cell or processing a valid cell to generate a new frame; Controlling traffic and cell multiplexing according to respective transport network traffic conditions; And Multiplexing or transmitting multiplexed AMT cells according to the characteristics of the traffic Satellite AT matching method for transmitting the Internet and video data to the satellite network comprising a. The method of claim 8, wherein the frame or packet transmission step is Generating an AMT cell from an MPEG-2 transport stream of the video line by an AAL5 method or collecting the AMT cells to generate an MPEG-2 transport stream; Removing the overhead and empty cells of the frame in the AT line to extract only valid cells or inserting empty and overhead cells into the valid cells to generate a frame; And Generating an AT cell by the AAL 5 method from the Ethernet frame of the Internet line or collecting the AT cells to generate an Ethernet frame Satellite AT matching method for transmitting the Internet and video data to the satellite network comprising a. The method of claim 8, wherein the traffic and cell multiplexing control step Storing an AT cell in a PIPO and inputting / outputting the cell unit; And In the case of the video cell and the terrestrial AMT cell, the thresholds of the corresponding PIPO are set as the primary and secondary, collecting the traffic state and informing the state, and performing the multiplexing control according to the traffic state. Satellite AT matching method for transmitting the Internet and video data to the satellite network comprising a. The method of claim 8, wherein the multiplexing or demultiplexing step Sequentially multiplexing cells of the corresponding PIPO of each line in a round robin manner before reaching the first threshold of the video data PI and the AT data in case of the video cell and the terrestrial AT cell; If the video data PIPO and ATM data PIPO reach a first threshold, transmitting a cell or terrestrial AT cell of video so as not to exceed the first threshold of PIPO in the cell transmission order of the Internet; Discarding cells in which the video data piepo and the ATM data piepo overflow beyond the first and second thresholds; Multiplexing cells using the multiplexing table according to the state information of each piepo; And When demultiplexing the input data, compare the VPI / VCI value stored in the demultiplexing table with the VPI / VCI value of the ATM cell header received from the satellite network to reverse the corresponding PIPOLO cell. Multiplexing steps Satellite AT matching method for transmitting the Internet and video data to the satellite network comprising a. The method of claim 11, wherein the cell discarding step For video data, if Pipo overflows beyond the second threshold, discard the entire cell generated from the MPEG-2 transport stream, In the case of terrestrial AMT cells, when the terrestrial ATMP pipo exceeds the secondary threshold, the cell whose cell loss priority (CLP) bit value is 1 in the header stored in the PIPO is discarded first, and the cell loss priority (CLP) bit value is discarded. This zero cell is left in the Pipo, In the case of Internet data, when the overflow occurs without setting a threshold, PIOT discards the entire cell generated from the Ethernet frame, Satellite AEM matching method for transmitting the Internet and video data to the satellite network. 12. The method of claim 11 wherein the multiplexing table is If the pipo of the video data and the AT cell does not reach a threshold, sequentially multiplexing into video, AT, internet, video, AT, internet state by a round robin method; Sequentially multiplexing the video, AT, video, video, AT, Internet status when the pippo of the video data reaches a threshold; Multiplexing sequentially into the video, AT, AT, video, AT, and internet states when the PIPO of the AT cell reaches a threshold; And Sequentially multiplexing the video data and the ATM cell's PIPO to the video, ATM, video, video, ATM, and ATM states if the PIPO reaches a threshold at the same time. Satellite AT matching method. The method of claim 11, wherein the demultiplexing step It does not store VPI / VCI information used in terrestrial AMT cells that occupy more than a certain size of memory, but stores only VPI / VCI information allocated to video data and Internet data, A satellite ATM matching method for transmitting Internet and video data to a satellite network, wherein all cells having non-VPIA / VSI values corresponding to internet data are demultiplexed to terrestrial ATMP.