Electronics and Telecommunications Research Institute

Hyun Ha Hong

Min Soo Kim

Deock Gil Oh

Dae Ig Chang

Young Ki Lee

Ho Jin Lee

Hyeong Ho Lee

Ju Young Park

Ji Wook Youn

Joon Gyu Ryu

Chang Gyu Lim

Yong Hyub Won

Min Su Shin

Man Kyu Park

Mankyu Park

Je I Back

Mun G Kyong

Hang G Park

Deok H Kim

Nam Young Kim

Sung Hoon Kwak

Disclosed is a star network/mesh network accessing method and apparatus of a terminal in a satellite communication system, the method including receiving time slot resources from a central station and operating in a time division multiple access (TDMA) start network communication mode between the central station and a terminal, transferring, to the central station, a TDMA mesh network connection request message for a destination terminal, receiving traffic burst time plan (TBTP) information corresponding to the TDMA mesh network connection request message from the central station and operating in a TDMA mesh network communication mode between terminals, and switching from the TDMA mesh network communication mode between the terminals to a single channel per carrier (SCPC) mesh network communication mode between the terminals when Voice over Internet Protocol (VoIP) traffic is greater than a threshold.

Apparatus and method for accessing star network/mesh network of time division multiple access (TDMA)/single channel per carrier (SCPC) integrated satellite communication

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.

Method of detecting packet error of return link performed in satellite communication apparatus

The present invention relates to a method of seamlessly providing a satellite multimedia Internet service to a fixed subscriber belonging to a lower user network even in a satellite shadow environment and shortening a hand-over processing time between heterogeneous networks by applying a fast layer 3 hand-over technology between satellite and wireless networks in a mobile satellite terminal device.

Method and system for fast layer 3 hand-over

An apparatus for and a method of integrating switching and transferring of synchronous optical network/synchronous digital hierarchy (SONET/SDH), plesiochronous digital hierarchy (PDH), and Ethernet signals, which integrate and provide connection of synchronous digital (SONET/SDH) signals, plesiochronous digital (PDH) signals, and Ethernet signals, mutually change the synchronous digital (SONET/SDH) signals, the plesiochronous digital (PDH) signals, and the Ethernet signals, packet switching, synchronous timeslot switching, and channel configuration management and control functions in one system. Thus, packet switching capacity, timeslot switching capacity, and packet/timeslot bridging capacity can be enlarged and configured according to corresponding application. Also, a distinctive service compared to a service provided by a separate Ethernet device or a SONET/SDH network device can be provided through a packet/timeslot bridge. In addition, varied and reliable communication service at a moderate price can be provided to service users, and decreased investment and maintenance fee can be provided to carrier service providers.

Apparatus for and method of integrating switching and transferring of SONET/SDH, PDH, and Ethernet signals

Provided is an apparatus for guaranteeing the performance of Ethernet packets in an Ethernet system. A packet sorting unit receives the Ethernet packets, processes header information of the Ethernet packets, and sorts the Ethernet packets. A packet processing unit stores the Ethernet packets, calculates the number of the Ethernet packets, and outputs the Ethernet packets. A packet to synchronous digital hierarchy frame converting unit receives the Ethernet packets output from the packet processing unit, converts the received Ethernet packets into synchronous digital hierarchy frames, calculates the number of the converted frames, maps the frames to a virtual container group, and outputs the virtual container group. And a signal processing unit measures the performance of the Ethernet packets on the basis of the number of the Ethernet packets stored in the packet processing unit and the number of the frames, and outputs the first and second control signals.

Apparatus and method for guaranteeing performance of packet in Ethernet system

Disclosed is an optical switching system with a combined space and wavelength division multiplex based on the repeated contention technique. The present invention has effects on high capacity in required in the optical switch module, by performing the contention resolution over a two consecutive cell time slot which repeatedly employs the present and previous state information. According to the present invention, the input cells make use of a switching opportunity two times. As a result, the present invention maintains the desired probability of cell loss, keeping up the state values L small. Also, the present invention can decrease the number of filters because it is possible to decrease the number of wavelength used for the wavelength conversion. Furthermore, the present invention has an effect on the high capacity based on the extension of the optical switch modules.

Optical switching system with combined space and wavelength division

Universal signaling service unit for providing such signal that required to connection and progress of calling in time-division electronic switching system. The invention, in constitution that TSU, TSP, ASTU, ASIP, DTIU, DTIP, FIU, FIP, USTU, LSIP, IPCB, ASP are made to cooperate together, is organized such that: PCM signal data are transmitted and received by the control via telephony device-bus TD-bus, fault status is informed via alarm bus, various service functions requiring real time process are commonized to make one universal signaling tranceiver assembly USTA, signaling service function in USTA is divided into signal tone transmitting and receiving mode service group, and standby mode service group, and USTU is divided into USTU .0. and USTU 1; wherein USTA block is organized with TD-bus interface block, control block, sending block, receiving block, SHW interface block, and messages of FIGS. 6a to 6g are exchanged between LSIP and USTA through TD-bus so that universal signal service unit is operated, and sequence of operational process within USTA is carried out in sequence of FIG. 8.

General signaling service unit of electronic switching system

Growing community of inventors

Daejeon, South Korea

Hyun Ha Hong