Abstract: A device and method to monitor and temperature compensate change in wavelength within a WDM optical communication system is disclosed. The device includes a laser diode for generating an optical signal for temperature monitoring, a first fiber Fabry-Perot interferometer sensor unit for generating a first sensor signal according to temperature by means of the optical signal, and a processor for monitoring temperature by means of the first sensor signal and an externally provided second sensor signal and equalizing waveforms of the two sensor signals with each other. The externally provided second sensor signal is provided by a remote node that includes a second fiber Fabry-Perot interferometer sensor unit for receiving the optical signal for temperature monitoring to generate the second sensor signal according to temperature, and a waveguide grating router unit for transmitting the second sensor signal to the optical line terminal.

Abstract: A GE-PON (Gigabit Ethernet Passive Optical Network) apparatus includes a 2×N splitter, an OLT (Optical Line Terminal) connected to the 2×N splitter via a first path line or a second path line, and a switching unit for switching the first path line or the second path line upon receiving a predetermined control signal. An ONU (Optical Network Unit) generates a switching request according to a signal environment and transmits the generated switching request to the OLT.

Abstract: A light concentrator for an optical antenna gradually narrows from the light receiving end to the end in contact with a light detector, and has a refractive index that gradually increases from the first to the second end, to afford a greater acceptance angle for the incoming optical signal. The increase may occur in stages of corresponding layers of the light concentrator, the layers being arranged in order of increase in refractive index from the first end to the second end.

Abstract: A method of transmitting security data from a source point to a target point in a point-to-multipoint communication system is provided. The method includes the steps of forming an encryption tag field that includes information about an encryption tag type, which indicates whether transmission data is encryption-enabled or encryption-disabled; forming a packet data field which includes encrypted transmission data; forming a first integrity check field indicating the CRC check sum of the encrypted data; forming a length and type field indicating the sum of the lengths of the packet data field and the first integrity check field. Finally, a transmission frame is formed with these formed fields, a source address field indicating the address of the source point, and a destination address field indicating the address of the target point.

Abstract: A method for checking whether a transmission is a multicast transmission or not is disclosed, which includes in an Ethernet passive optical network including an OLT and multiple ONUs connected to the OLT, checking whether a transmission is a multicast transmission or not by generating a multicast LLID that represents multicast information. Subsequently from a multicast MAC address in a MAC layer in the multiple ONUs or the OLT, so that at least one ONU from among the multiple ONUs or the OLT receives the multicast transmission, the method comprising the steps of: (1) modifying the multicast MAC address and mapping the modified address to a LLID field in a RS layer below the MAC layer; and (2) generating mode information, which represents a multicast transmission, being adjacent to the LLID field and locating the mode information, wherein, the RS layer checks whether a transmission transmitted to the ONU or the OLT is a multicast transmission or not.

Abstract: A MAC (Medium Access Control) control block for controlling transmission of data between a plurality of MAC clients and a plurality of MACs in an Ethernet passive optical network (EPON) is provided. The MAC control block includes the plurality of MAC clients and the plurality of MACs associated with the MAC clients for forming a frame for data transmission; a plurality of optical multipoint (OMP) blocks connected between the MAC clients and the MACs for implementing a multipoint control protocol (MPCP); and a multipoint gating control block for controlling the OMP blocks so that when any one of the OMP blocks is transmitting the data, the other OMP blocks are prevented from transmitting data.

Abstract: An uplink packet data transmission system and method are provided which can reduce a collision probability in a contention period by assigning a priority to mobile stations when bandwidth allocation is rejected due to lack of resources of a base station from which a best effort service is provided. In a method for transmitting best effort data in a communication system, the base station allocates resources to mobile stations for which a reservation has been made in a previous time period when bandwidth for the mobile stations requesting bandwidth allocation is insufficient, reserves bandwidth for mobile stations for which the bandwidth allocation has been rejected, and transmits reservation information. The mobile stations receive the reservation information, skip a next scheduled bandwidth allocation request, and transmit data through bandwidth allocated from the base station.

Abstract: Disclosed is a bandwidth allocation method for an optical line termination (OLT) in a Gigabit Ethernet passive optical network (GE-PON) having one OLT and a plurality of optical network units (ONUs) connected to the OLT. The method includes the steps of transmitting a registration request grant message for granting an opportunity for transmitting a registration request signal from the OLT to the ONUs; determining the number of ONUs that transmitted registration request messages in response to the registration request grant message; and segmenting a single time slot into a plurality of minislots, segmenting a partial bandwidth of each of the segmented minislots so as to accommodate the ONUs, and allocating the segmented bandwidths to the ONUs that transmitted the registration request messages as voice bands.

Abstract: Disclosed is a frame structure in a high-speed wireless personal area network (WPAN) and a message transmitting method thereof which enable communications among devices existing in different piconets by using a device that provides a bridging function in the IEEE 802.15.3 WPAN. In a high-speed WPAN system which includes a parent piconet having a plurality of devices and a child piconet using time slots allocated by the devices located in the parent piconet, and a bridge device located in the child piconet, that broadcasts information about the devices of the parent piconet and information about the devices of the child piconet to the devices included in the high-speed WPAN, and operates to perform a data transfer between a first specified device in the child piconet and a second specified device in the parent piconet.

Abstract: A method is provided for transmitting non-real-time traffic in a broadband communication system. A Base Station (BS) transmits to Mobile Stations (MSs) status information corresponding to each service for transmission of non-real-time traffic. The MSs to the BS each send a bandwidth allocation request according to the status information provided from the BS.

Abstract: A point-to-point emulation apparatus and method in a broadband wireless communication system are provided. In a communication method in an RAS in a broadband wireless communication system, an ID of a source terminal and an ID of a destination terminal are registered in a database by mapping the ID of the source terminal to the ID of the destination terminal, for communications between terminals registered to the RAS. Upon receipt of traffic data from the source terminal, a header of the traffic data is converted using the database, for transmission to the destination terminal on a downlink.

Abstract: A high-speed WPAN (Wireless Personal Area Network) system for enabling communication between piconets is configured by at least one first device located in the child piconet. A C-PNC (Child Piconet Coordinator) device includes a C-MIB (Child Piconet Management Information Base) stores mapping information associated with devices located in the child piconet and a P-MIB (Parent Piconet Management Information Base) stores mapping information associated with devices located in a parent piconet. At least one second device is located in the parent piconet. The first device includes a C-MIB and a first B-MIB (Bridging Management Information Base), detects destination information of data using the mapping information stored in the first B-MIB to transmit data to a device located in the parent piconet, and transmits the data containing the detected information to the C-PNC device.

Abstract: Disclosed are an apparatus for transmitting a frame and a method for controlling the transmission of a frame for strict synchronization. The frame transmission apparatus includes a cycle controller for providing information about a transmission block of the transmission cycle, a transmission multiplexer for multiplexing and outputting synchronous frames and asynchronous frames input thereto through the frame transmission apparatus in one transmission cycle, and a transmission controller for controlling the transmission multiplexer such that total sizes of the multiplexed synchronous frames and asynchronous frames do not exceed a size of one transmission cycle using information about the sizes of the synchronous frames, the sizes of the asynchronous frames, and the transmission block of the transmission cycle provided by the cycle controller.

Abstract: Disclosed are a synchronous Ethernet network and a time allocation method used therein. The synchronous Ethernet network includes a gateway having a plurality of ports, and a plurality of network points having one-to-one connection with the ports of the gateway in a star topology, the gateway allocating time to the network end points based on a cycle including an asynchronous part and a synchronous part, wherein the gateway prepares a plurality of time slots by dividing the synchronous part in one cycle according to ports and allocates at least one divided time slot to each network end-point participating in communication in a corresponding cycle.

Abstract: Disclosed is a time allocation method for a synchronous Ethernet network. The time allocation method for a synchronous Ethernet network including a gateway allocating time based on a cycle including an asynchronous part and a synchronous part and a plurality of network end points connected to the gateway, includes the steps of (a) preparing a plurality of time slots by multi-dividing the synchronous part in one cycle, and (b) allocating each time slot to a plurality of network end points participating in communication in a corresponding cycle in common.

Abstract: Disclosed is an initial access signaling method in a synchronous Ethernet device. The initial access signaling method in a synchronous Ethernet device is provided to determine if the synchronous Ethernet device can perform a synchronous Ethernet operation together with a counterpart device connected to the synchronous Ethernet device in order to provide a compatibility between the synchronous Ethernet and the conventional Ethernet.

Abstract: A home network system for supporting continuity of data transfer destined for an MS (Mobile Station) when the MS moves between wireless nodes, comprising a server for storing multimedia data and a network connecting the server to the MS via the wireless nodes. A first wireless node, while transferring predetermined data from the server to the MS, senses that a connection with the MS is cut off. The predetermined data to be transferred to the MS is then buffered in one or more of the wireless nodes at a time point of disconnection with the MS, and the first wireless node maintains a connection with the server. A second wireless node in the home network system establishes a connection with the MS and, in response a data transfer request from the MS, provides the buffered data to the MS.

Abstract: Disclosed is a method for constructing a frame of data for transmission by each Ethernet device in a synchronous Ethernet, which comprising the steps of receiving the data for transmission and confirming whether or not the data for transmission are synchronous data, when the received data are synchronous data, marking that the data are synchronous data in a preamble of the frame and constructing a synchronous frame by including the received data into a data portion of the frame which does not contain a MAC header and when the received data are asynchronous data, marking that the data are asynchronous data in the preamble of the frame and constructing an asynchronous frame by including the received data into a data portion of the frame containing a MAC header.

Abstract: An Ethernet protocol hierarchical structure for simultaneously providing real-time and non-real-time services is disclosed. The Ethernet media access control adaptation apparatus for real-time services performs operations between MAC layers and a MAC client for adapting synchronous Ethernet, in which real-time and non real-time services can be simultaneously provided based on an Ethernet MAC.

Abstract: An asynchronous data segmentation/transmission method for synchronous Ethernet and a data structure used therein are disclosed. The asynchronous data segmentation/transmission method can segment and transmit asynchronous data such that the asynchronous data can be transmitted through a transmission frame for each transmission cycle.