Abstract: A system and method for transmitting/receiving data in a communication system is provided. A transmitter is allocated resources using a circuit mode scheme, determines if there is actual data to be transmitted to a receiver, and transmits information representing that there is no actual data to be transmitted using the allocated resources when it is determined that there is no actual data to be transmitted.

Abstract: An apparatus and method for retransmission in a wireless communication system. The method includes transmitting data to a Mobile Station (MS), identifying if there is an error in the transmitted data through a control message, if there occurs an error in the data, allocating resources for retransmitting data for erroneous data, transmitting information on the resources allocated for retransmission, to the MS, and retransmitting the data for the erroneous data to the MS.

Abstract: Provided is a red phosphor represented by formula 1: (Li(2-z)-xMx)(MoO4)y:Euz,Smq??(1) where M is an element selected from K, Mg, Na, Ca, Sr, and Ba, 0?x?2, 0.5?y?5, 0.01?z?1.5, and 0.001?q?1.0. The red phosphor has emission characteristics such as high brightness when excited by, in particular, an excitation light source of around 405 nm. The red phosphor is 6 times brighter than conventional phosphors. Furthermore, the red phosphor can be used in a red light emitting diode (LED) that has a UV excitation light source, a white LED, and an active dynamic liquid crystal device (LCD). In addition, the white LED using the red phosphor has a color rendering index of 90 or greater and so has excellent color rendition.

Abstract: Provided is a vertical semiconductor light-emitting device and a method of manufacturing the same. The method may include sequentially forming a lower clad layer, an active layer, and an upper clad layer on a substrate to form a semiconductor layer and forming first electrode layers on the upper clad layer. A metal support layer may be formed on each of the first electrode layers and a trench may be formed between the first electrode layers. The substrate may be removed and a second electrode layer may be formed on the lower clad layer.

Abstract: An apparatus and method for performing handover in a broadband wireless communication system are provided. A communication method includes broadcasting, by a Base Station (BS), a neighbor advertisement message including neighbor cell information through each Frequency Allocation (FA); analyzing the neighbor cell advertise message by a plurality of Media Access Control (MAC) processors of an Mobile Station (MS) to obtain FA configuration information of each neighbor cell; independently determining handover by the MAC processors of the MS; generating the start of handover by one MAC which first determines handover; and determining a handover target by the remaining MAC processors so that handover is performed to different FAs of the same BS of the MAC processor which generates the start of handover by using the FA configuration information of each neighbor cell.

Abstract: An apparatus and a method for transmitting uplink feedback data in a broadband wireless mobile communication are provided. The method comprises dividing tiles used as a feedback channel into a preset number of groups, selecting one group among the preset number of groups using a downlink channel, selecting a number of tiles, the number of tiles being equal to a number of tiles required for feedback data transmission in the selected group, and mapping feedback data to each selected tile. Thereby, feedback information can be transmitted via a tile selected by a terminal based on a channel state without a process of allocating and reallocating an additional feedback channel, thus enhancing efficiency of uplink wireless resources.

Abstract: An Internet Protocol (IP) address acquisition in a broadband wireless communication system is disclosed. A terminal includes a driver for loading one of a plurality Media Access Control (MAC) addresses for a multi-Frequency Allocation (FA) connection when the terminal is initialized; an interface for registering the loaded MAC address to use in an upper layer of a MAC layer; and a manager for acquiring an IP address using the registered MAC address when a network entry for at least one FA is complete.

Abstract: An apparatus and method for performing initial network entry in a broadband wireless communication system are provided. A communication method includes broadcasting, by a Base Station (BS), a Downlink Channel Descriptor (DCD) message including information on a different Frequency Allocation (FA) of the BS using all FAs; connecting, by one of a plurality of Media Access Control (MAC) processors of a Mobile Station (MS), using an arbitrary FA of the BS; obtaining, by the MS, information on the different FA of the BS by analyzing the DCD message received using the arbitrary FA; and performing, by one or more of the remaining MAC processors of the MS, a network entry process using the different FA of the BS according to the different FA information.

Abstract: A broadband wireless communication system is provided. A sending apparatus in the broadband wireless communication system includes a controller for distributing packets to a plurality of processors to transmit the packets in a multi-Frequency Allocation (FA) access mode; the plurality of the processors for processing the packet provided from the controller in a Media Access Control (MAC) layer; and a plurality of senders for encoding the packets provided from the corresponding processors in a physical layer and transmitting a signal generated through the physical layer encoding.

Abstract: An apparatus and method for supporting Quality of Service (QoS) in a wideband wireless communication system using multiple Frequency Allocations (FAs) are provided. In a transmitting method for packet distribution in the wideband wireless communication system, the method includes, during a network entry process, determining a number of FAs through multi-FA capability negotiation; distributing packets, received from a superordinate layer, through the multiple FAs; and transmitting the packets distributed through the multiple FAs. Accordingly, packets can be effectively distributed through multiple FAs, and QoS can be effectively provided.

Abstract: A method for controlling power in a communication system. A base station allocats Channel Quality Information Channels to at least one mobile station, transmits the allocated Channel Quality Information Channel information, and transmits power control information to the mobile station to which the Channel Quality Information Channel is allocated. And a mobile station for receives Channel Quality Information Channel allocation information, receives power control information, and detects the power control information allocated to the mobile station by using the Channel Quality Information Channel allocation information.

Abstract: A method for controlling power in a communication system. A base station allocates Channel Quality Information Channels (CQICHs) to at least one mobile station, transmits CQICH information for the allocated CQICHs, and transmits power control information to the mobile stations to which the CQICHs are allocated. A mobile station receives CQICH allocation information, receives power control information, and detects the power control information allocated to the mobile station by using the CQICH allocation information.

Abstract: A method and system for transmitting a signal in a communication system is disclosed, in which a BS transmits control information in a predetermined third zone of a frame, the frame being divided into a first and a second zones in frequency and the third zone being included in the first zone, and transmits a data burst in at least one of a fourth zone and the second zone, the fourth zone being a remaining zone of the first zone other than the third zone.

Abstract: In a light emitting diode, a first semiconductor layer supplies electrons, and a second semiconductor layer supplies holes. An active layer is formed between the first and second semiconductor layers. The active layer receives electrons and holes, and emits light in response to coupling between the electrons and the holes. A first reflective layer is formed on a bottom portion of the first semiconductor layer, and a second reflective layer is formed on a top portion of the second semiconductor layer. The light emitted from the active layer exits toward a side of the active layer.

Abstract: A method and apparatus for transmitting and receiving MAP information in a communication system are provided. A base station acquires channel quality information of each mobile station, generates sub-MAPs using MAP information, to which at least one of a coding scheme, a modulation scheme and a repetition scheme is applied, separately for each mobile station according to the channel quality information, and transmits the generated sub-MAPs. A mobile station receives MAP information from the base station, detects a sub-MAP allocated to the mobile station from the received MAP information, and restores the detected sub-MAP to MAP information using at least one of a corresponding decoding scheme, demodulation scheme and repetition scheme corresponding to coding scheme, modulation scheme and repetition scheme applied in the base station, based on channel quality information of the mobile station. Accordingly, system overhead can be reduced.

Abstract: A method and system for configuring a frame in a communication system is provided.

Abstract: Disclosed is a method for controlling transmission power to be allocated to sub-carrier signals in a cellular communication system capable of dividing a frequency band into a plurality of sub-carrier bands and multiplexing the sub-carrier signals of the sub-carrier bands based on multiple frequency reuse factors.

Abstract: A light emitting device having a monolithic protection element and a method of fabricating the light emitting device are provided. The light emitting device includes: a light emitter having a cathode and an anode; and the resistive protection element connected to the light emitter in parallel through the cathode and the anode. Here, a resistance Rs of the resistive protection element has a value between a forward resistance Rf and a reverse resistance Rr of a current of the light emitter.

Abstract: An apparatus and method for generating subchannels in a communication system are provided. An apparatus and method of the invention includes a Base Station (BS) in which the BS groups J slots included in a subchannel generation zone into I groups, selects, from the J slots, M band-Adaptive Modulation and Coding (AMC) slots with which it will generate a band-AMC subchannel, selects (J-M) slots as diversity slots with which it will generate a diversity subchannel, generates the band-AMC subchannel using the M slots and generates the diversity subchannel using the (J-M) slots.

Abstract: An apparatus for transmitting/receiving a signal in a communication system is provided. A Mobile Station (MS) spreads a transmission signal to generate a spreading signal, receives, from a Base Station (BS), information on a second spreading signal transmission region, extended from a first spreading signal transmission region, and maps the generated spreading signal to a subcarrier in the second spreading signal transmission region. A Base Station (BS) transmits information on a second spreading signal transmission region extended from a first spreading signal transmission region, for reception of a spreading signal, receives a spreading signal mapped to subcarriers over the second spreading signal transmission region, from an Mobile Station (MS), detects a spreading signal from the spread signal mapped to the subcarriers, and despreads the detected spreading signal to restore a transmission signal.