Abstract: An apparatus and method for controlling a sleep mode in a wireless access communication system. The apparatus determines a predetermined number of groups for grouping at least one subscriber terminal according to type information of a paging interval equal to the sum of the sleep interval and the listening interval, and registers the subscriber terminal in one group from among the groups on the basis of the paging interval type of the subscriber terminal. Upon receipt of the group information, the apparatus controls a base station to pre-recognize a terminal woken up at a predetermined time from among a plurality of terminals entering the sleep mode, resulting in reduction of the number of unnecessary paging message transmissions and improved efficiency of the wireless access communication system.

Abstract: Disclosed is an apparatus and method for recovering a communication link between a Mobile Station (MS) and a Base Station System (BSS) in a mobile communication system when the communication link is disconnected while a communication service is in progress. When detecting the disconnection, the MS stores information of the communication link. If the MS acquires synchronization with the BSS within a predetermined time period from the detection, it resumes the communication service through the communication link. Upon the disconnection, the BSS stores resource and other information of the MS. If the BSS detects that the MS has acquired synchronization with the BSS within the predetermined time period from the disconnection, the BSS resumes the communication service through the communication link. This ensures a stable communication service in a mobile communication system that has many radio dead zones where the MS cannot normally receive services.

Abstract: Provided are a cyber shopping mall management apparatus, and a system and method for managing a cyber shopping mall using the apparatus that can reduce a return rate of a purchased wear item. The cyber shopping mall management method includes adjusting a size of an image of a wear item to be purchased to fit a size of an image of an object to wear the wear item, synthesizing the adjusted wear item image onto the object image, and transmitting the synthesized image to a buyer. Thus, the cyber shopping mall management system and method enable a buyer to indirectly examine whether a wear item to be purchased can fit an object through an image of the object wearing the desired wear item, thus reducing a return rate of purchased wear items.

Abstract: A method for receiving common control information from a base station to a plurality of subscriber stations in a wireless communication is provided. The common control information includes first information that all of the plurality of subscriber stations commonly receive and second information that the plurality of subscriber stations separately receive according to channel states of the plurality of subscriber stations. The first information is decoded by demodulating and decoding the common control information according to a modulation scheme and a coding scheme corresponding to an MCS (Modulation and Coding Scheme) level applied to the first information in the base station. The second information is decoded by demodulating and decoding the common control information according to a modulation scheme and a coding scheme corresponding to MCS levels applied to the second information in the base station.

Abstract: Disclosed is a method, apparatus and system for providing a financial service through a mobile station in a mobile communication network. The system includes the mobile station for reading a barcode, transmitting user authentication data and the barcode, receiving passbook data, and storing and managing the passbook data; the mobile communication network for receiving the user authentication data and the barcode to thereby provide barcode information to a bank server, determining whether to approve the service; the bank server for managing the passbook data, allocating a specific barcode to each automatic machine, providing the location information of the automatic machine, corresponding to the barcode, and providing the mobile station with a banking service; and the automatic machine for receiving the barcode and outputting the received barcode, and providing the banking service through the bank server when the service is approved.

Abstract: An apparatus and method for updating the location of an idle-mode MS in a communication system are provided, in which the MS transmits a ranging request message requesting location update to a BS, receives a ranging response message from the BS, determines from the ranging response message whether downlink traffic has been generated for the MS, and performs network reentry if downlink traffic has been generated for the MS, and upon receipt of the ranging request message from the MS, the BS performs a location update procedure, determines whether downlink traffic has been generated for the MS, generates the ranging response message including information indicating whether downlink traffic has been generated for the MS, and transmits the ranging response message to the MS.

Abstract: A handover method and apparatus in a communication system are provided. The method includes an MS sending to a serving BS a bandwidth allocating request message for sending a MOB_MSHO-REQ message requesting a handover; activating a timer set to a bandwidth allocation waiting time in relation to the bandwidth allocating request message; stopping the timer upon receipt of a bandwidth allocation message from the serving BS before the timer expires; and determining to perform a handover to a target BS if the MS does not receive the bandwidth allocation message from the serving BS before the timer expires.

Abstract: An apparatus and method for performing a handover in a communication system are provided. For the handover, an MS determines whether a handover process with a serving BS runs normally. If the handover process is abnormal, the MS notifies a target BS of the abnormal handover process and the target BS performs the handover with the MS using handover information corresponding to handover information lost due to the abnormal handover process.

Abstract: In a communication system, a Base Station (BS) transmits a BS diversity set, or the BS diversity set and a BS recommended set to a Mobile Station (MS), and generates a temporary BS diversity set including BSs which are included in the BS diversity set and the BS recommended set, thereby enabling Fast Base Station Switching (FBSS) handover even though diversity set discrepancy between the BS and MS occurs.

Abstract: Provided is a channel estimation apparatus and method. In the channel estimation apparatus, a channel estimator performs channel estimation onto a received symbol and output a channel estimation result. The channel estimation result is stored in an estimation buffer along with a channel estimation result compensated in a preamble phase compensator. The preamble phase compensator receives a channel estimation result for pilot subcarriers of a data symbol and a preamble channel estimation result from the estimation buffer, acquires a phase rotation value between them, and compensates the preamble channel estimation result with the phase rotation value. When FCH and DL-MAP are demodulated, pilot subcarriers in the Nth PUSC symbol have been used to estimate the channel of the Nth PUSC symbol.

Abstract: A registration response (REG_RSP) message is generated which includes a type field, a length field, and an integrated CID (Connector Identifier) field. The integrated CID field includes an integrated CID inserted thereinto. The integrated CID is configured by using a new CID assigned to the subscriber terminal and an old CID assigned to the subscriber terminal by a current serving base station. The type and length fields include type information and length information of the integrated CID respectively inserted thereinto. The generated REG_RSP message is transmitted to a handover target subscriber terminal. A traffic indicator (TRF_IND) message is generated which includes at least one short BCID (Basic Connector Identifier) field into which a short BCID is inserted. The short BCID is configured by a preset number of bits among a total of bits representing a BCID of a positive subscriber terminal that must receive traffic indication information. The generated TRF_IND is then broadcast.

Abstract: A decoding apparatus and method of a terminal in a wireless communication system are provided. A carrier to interference and noise ratio (CINR) estimator estimates a CINR value of a received signal, and a controller generates a modulation and coding scheme (MCS) level candidate set satisfying the estimated CINR value and a target packet error rate (PER) based on a look-up table. A decoder switch determines if an MCS level of a burst is included in the MCS level candidate set when the burst having no connection identifier (CID) information exists in a corresponding frame, and determines to decode the corresponding burst if the MCS level of the burst is included in the MCS level candidate set and to discard the burst otherwise.

Abstract: An apparatus and method for canceling an interference signal in a broadband wireless communication system are provided. A receiver of a wireless communication system includes at least two receive antennas for receiving a target signal of a serving base station and interference signals of at least one neighbor base station; a channel estimator for estimating channels of the signals received through the receive antennas; and a detector for detecting the target signal using channel estimation values of the received signals. Accordingly, it is possible to reduce error propagation caused by the incorrect estimation and detection of the interference signal. In addition, time delay for detecting/restoring/removing the interference signal does not occur. Moreover, the increase of additional buffers can be prevented. Consequently, the increase of hardware complexity can be prevented.

Abstract: An apparatus for communicating a frame control header (FCH) in a wireless access communication system and a method thereof are provided. The apparatus for receiving the FCH includes an information generator for generating information on the FCH, an adder for adding an error check code of a predetermined length to the information bit stream received from the information generator to output an information bit stream, a modulation symbol generator for coding and modulating the information bit stream received from the adder to generate modulation symbols, and an operator for mapping the modulation symbols received from the modulation symbol generator to predetermined slots to perform inverse fast Fourier transform (IFFT) operation.

Abstract: A Peak-to-Average Power Ratio (PAPR) reduction apparatus and method in an OFDM communication system are provided. In the PAPR reduction method, magnitude and phase components are extracted from transmission sample data. Peaks having magnitude components exceeding a threshold are detected by comparing the extracted magnitude components with the threshold. The highest of the peaks is detected and compared with the threshold. If the highest peak is greater than the threshold, the highest peak is updated.

Abstract: An apparatus and method is provided for transmitting a signal in a communication system. Upon transition to a power saving mode, a lower layer unit sends a notification indicating the transition to the power saving mode to an upper layer unit. Upon receipt of the notification indicating the transition, the upper layer unit activates a traffic filter having a filtering condition. If upper layer traffic is generated after activating the traffic filter, the upper layer unit filters the upper layer traffic using the traffic filter, and processes the upper layer traffic according to the filtering result.

Abstract: Provided is an apparatus and method for receiving a signal in communication system. The apparatus and method includes generating a particular log-likelihood ratio (LLR) value by demapping an input signal according to a particular demapping scheme among a plurality of demapping schemes; performing a control operation of buffering the particular LLR value in a particular LLR sub-buffer for buffering an LLR value generated according to the particular demapping scheme among the plurality of LLR sub-buffers for buffering an LLR value generated according to each of the plurality of demapping schemes; and performing a control operation of reading an LLR value buffered in an LLR buffer including the plurality of LLR sub-buffers.

Abstract: A method and apparatus for processing time windowing to transmit a signal in a Broadband Wireless Access (BWA) communication system based on Orthogonal Frequency Division Multiple Access (OFDMA). A signal of a first interval included in a previous symbol prior to a current symbol is stored as a signal of a previous symbol interval. The current symbol includes a guard interval and an effective symbol interval subsequent to the guard interval. The current symbol is windowed by overlapping the stored signal of the first interval with a signal of a second interval included in the current symbol subsequent to the previous symbol. A windowed signal is transmitted.

Abstract: A scheduling method is provided for processing data in a communication system. The method includes performing downlink MAP (DL-MAP) decoding; generating a configuration table through the DL-MAP decoding; and processing data in a predetermined unit according to the generated configuration table.

Abstract: In a communication system, a terminal receives user information while an initial network entry operation is performed. The terminal transfers the received user information to an authentication server and receives an authentication information mapped to the user information required for the authentication from the authentication server. The terminal performs authentication with the authentication server using the received authentication information. Therefore, the terminal and the authentication server can securely share the authentication information, and the authentication server can easily change and manage the authentication information.