Abstract: An apparatus for transmitting and receiving data in multiple transmission paths including a satellite network path and a wired network path, the apparatus that receives content data through a satellite network path, receives redundant data including information to be used to restore the content data through a wired network path, and restores a lost portion of the content data using the redundant data, the redundant data being generated by applying network coding to the content data, is provided.

Abstract: A system and method for satellite communication that receives channel status information (CSI) of a forward link connected to a subscriber terminal station, resets a modulation and coding (MODCOD) of a physical layer based on the received CSI, and changes a congestion window value of a transmission layer based on the reset value of the reset MODCOD of the physical layer is provided.

Abstract: Provided is a method of detecting a packet error of a return link performed in a satellite communication apparatus receiving a packet through the return link. The method includes generating a first return link packet combination by assembling at least one fragmented packet received through the return link, and determining an error of the packet using at least one piece of information among fragmentation information on at least one second return link packet received after the first return link packet combination is generated, whether or not the first return link packet combination is complete, and packet process state information. Accordingly, it is possible to minimize packet loss caused by a reassembly error of a received packet.

Abstract: Provided is a method of identifying a transmission control protocol (TCP) packet loss, including transmitting at least one TCP data packet to a TCP receiver, estimating wireless channel status information using the TCP receiver by interaction between a TCP layer and a physical layer, and receiving an acknowledgement (ACK) packet including the estimated wireless channel status information from the TCP receiver.

Abstract: A first terminal according to the present invention is a first terminal among a plurality of terminals which is connected to a district center network management device in a VSAT (very small aperture terminal) system, including: a communication unit which connects the first terminal to the district center network management device through a star network; and a control unit which creates SCPC call establishment request information, transmits the created SCPC call establishment request information to the district center network management device through the communication unit, and performs SCPC connection with another terminal based on SCPC call establishment information which is transmitted from the district center network management device in response to the transmitted SCPC call establishment request information when SCPC (single channel per carrier) connection is desired to be performed with another terminal among the plurality of terminals.

Abstract: A system and method for satellite communication that receives channel status information (CSI) of a forward link connected to a subscriber terminal station, resets a modulation and coding (MODCOD) of a physical layer based on the received CSI, and changes a congestion window value of a transmission layer based on the reset value of the reset MODCOD of the physical layer is provided.

Abstract: When errors occur in a packet received from a satellite terminal device, a modulation and coding (MODCOD) value is calculated according to a result of the detection, and a calculated MODCOD value is transmitted to the satellite terminal device, so that packet loss is reduced based on the yield of actual traffic when the satellite terminal device transmits a return link packet. An occurrence of a packet error is detected by generating a first return link packet by sequentially assembling the plurality of return link packets from the satellite terminal device and performing a comparison analysis by comparing the first return link packet with a newly received second return link packet.

Abstract: Provided is a method of detecting a packet error of a return link performed in a satellite communication apparatus receiving a packet through the return link. The method includes generating a first return link packet combination by assembling at least one fragmented packet received through the return link, and determining an error of the packet using at least one piece of information among fragmentation information on at least one second return link packet received after the first return link packet combination is generated, whether or not the first return link packet combination is complete, and packet process state information. Accordingly, it is possible to minimize packet loss caused by a reassembly error of a received packet.

Abstract: A technology in which it is detected whether errors occur in a packet received from a satellite terminal device, a modulation and coding (MODCOD) value is calculated according to a result of the detection and the calculated MODCOD value is transmitted to the satellite terminal device, so that pack loss is reduced based on the yield of actual traffic when the satellite terminal device transmits a return link packet. A plurality of return link packets are received from the satellite terminal device. An occurrence of a packet error is detected by generating a first return link packet by sequentially assembling the plurality of return link packets and performing a comparison analysis by comparing the first return link packet with a second return link packet that is newly received.