Abstract: A method for transmitting a traffic indication message for directing a mobile subscriber station (MSS) in a sleep mode to transition to an awake mode in a Broadband Wireless Access communication system supporting the sleep mode and the awake mode. This method includes the steps of individually allocating, to MSSs belonging to a corresponding base station, corresponding areas indicating traffic instructions for the MSSs in a traffic indication field in the traffic indication message, and indicating state transition instructions in the areas allocated to the MSSs, before transmitting the traffic indication message to the MSSs.

Abstract: A method of restricting the use of at least one additional function in a mobile terminal is provided. The mobile terminal generates new data by executing an additional function of the mobile terminal. The mobile terminal encrypts the data with currently received location information, upon receipt of a restriction signal, stores the encrypted data, and upon request for reading of the stored data decrypts the stored data with currently received location information.

Abstract: Provided are a method and an accessory apparatus for receiving and reproducing DMB data. The DMB accessory apparatus receives DMB data, converts data formats of the received DMB data into multimedia data formats which can be reproduced by a typical mobile terminal, and transmits the DMB data converted into the mobile terminal reproducible data formats to the mobile terminal. Accordingly, even a mobile terminal, which does not have a function of receiving and reproducing DMB data, can reproduce the DMB data.

Abstract: A mobile broadcast system having a terminal is disclosed. The terminal transmits a message including a type-based identifier (ID) to a BCAST Subscription Management (BSM) in a corresponding network during network access. The BSM determines a type of an ID of the received message and then performs an authentication procedure according to the type of the ID.

Abstract: A base station using multiple antennas receives channel quality information from a terminal so as to allocate uplink/downlink resources to the terminal. Herein, the channel quality information is measured on the basis of a downlink preamble or pilot signal, and may include a received CINR or received signal strength. In addition, the base station predicts a received SINR by using a channel response and channel quality information between the multiple antennas and the terminal, and allocates a resource to the terminal according to the received SINR.

Abstract: Provided is an image processing apparatus and method for preventing degradation of image quality occurring when a bit-format of an image is converted. When a raw image is converted to an image having specific color resolution, the image to be converted can maintain an image close to the raw image by obtaining errors between pixels of the raw image and the image to be converted and minimizing the errors between the raw image and the image to be converted using an error diffusion scheme.

Abstract: A calibration apparatus and method for controlling the phase and amplitude of a signal in a smart antenna multicarrier communication system are provided. A calibration signal is allocated to remaining carriers after allocating carriers to a data signal, prior to transmission. Thus, the efficiency of frequency resources for data transmission is increased.

Abstract: A system and method for providing a UDP/IP (User Datagram Protocol/Internet Protocol)-based A1 interface in a mobile communication system are provided, in which a BSC controls an A1 interface connection by an A1 interface message using the UDP/IP as a data link layer protocol during communicating with a MSC, and the MSC controls the A1 interface connection by the A1 interface message using the UDP/IP as the data link layer protocol during communicating with the BSC.

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 method for encoding a rate-compatible block Low Density Parity Check (LDPC) code. The method includes designing specific LDPC codes for a predetermined number of coding rates, and generating a pruning pattern by comparing information node degrees of the predetermined number of LDPC codes; matching check node degrees of the predetermined number of LDPC codes; generating a predetermined number of puncturing patterns according to the check node degree when the matched check node degree is calculated; determining whether a first condition given for the generated puncturing patterns is satisfied; and determining the generated puncturing patterns as rate-compatible puncturing patterns when the puncturing patterns satisfy the first condition.

Abstract: A method for transmitting a signal by a transmitter in a frequency overlay communication system. The method includes generating y first signal groups by shuffling input information data with a length yN on an N-by-N grouping basis according to a first shuffling scheme; generating y second signal groups by performing N-point IFFT on each of the first signal groups; generating y third signal groups by multiplying each of the second signal groups by preset values; generating N fourth signal groups by de-shuffling the third signal groups on a y-by-y grouping basis according to a de-shuffling scheme; generating N fifth signal groups by performing y-point IDFT on each of the fourth signal groups; generating y sixth signal groups by shuffling the fifth signal groups according to a second shuffling scheme, and serial-converting the sixth signal groups; and performing a transmission RF process on the serial-converted signal and transmitting the RF-processed signal to a receiver.

Abstract: Disclosed is a method for receiving DMB services with a DMB receiving apparatus capable of operating both in first DMB receiving mode and in second DMB receiving mode in a weak electromagnetic field region. The method includes setting the DMB receiving apparatus to the first DMB receiving mode both to receive first DMB packet data and to detect second DMB packet data, checking detection of the second DMB packet data if an event occurs preventing reception of the first DMB packet data during the first DMB receiving mode, notifying the user of the DMB receiving apparatus of possibility of switching the apparatus from the first to the second DMB receiving mode if the second DMB packet data is detected, and switching the DMB receiving apparatus from the first to the second DMB receiving mode according to a user switching request.

Abstract: Provided is a method and apparatus for transmitting/receiving data in a frequency overlay communication system. A transmitter generates a data stream for data transmission, and performs Inverse Fast Fourier Transform (IFFT) on the generated data stream according to a predetermined first frequency band before transmission. Upon receiving a particular signal, a receiver performs Fast Fourier Transform (FFT) on the received signal according to a predetermined second frequency band, and restores the received signal.

Abstract: Disclosed is a method for setting a basic display screen in a mobile terminal. The mobile terminal stores a plurality of indicator images corresponding to each of a plurality of status indicators, and a plurality of images which can be used as background elements. A user can set a basic display screen by selecting desired display images of respective status indicators and various background element images. The indicator images changing with the change of status or according to the user's selection are easily readable and give pleasure to the user.

Abstract: The present invention relates to a transmitter and a transmission method in communication system using three Tx antennas in order to maximize STFBC coding gain. An input symbol sequence is transmitted through a plurality of Tx antennas in a predetermined method.

Abstract: An image offset adjustment apparatus for an LCD projector which is constructed to enable the adjustment of an image offset. The LCD projector includes a light source for emitting light, mirrors, and an LCD installed in front of the mirrors so that an image generated in the LCD is enlarged and projected on a screen. The image offset adjustment apparatus includes a projection lens section including a plurality of projection lenses having their respective LCDs at different circumferential positions to have different image offsets; a lens housing for housing the respective projection lenses adjacent to one another in a circumferential direction; rotation means for rotating the lens housing; and a controller for controlling the rotation means so that the lens housing can be controllably rotated to select one of the projection lenses and one of the image offsets as desired by a user.

Abstract: Disclosed is a system and a method for setting an internal time corresponding to a standard time at a current location in a mobile station of an asynchronous scheme. The mobile station of the asynchronous scheme uses a Simple Network Time Protocol (SNTP), which is an application of a Network Time Protocol (NTP), allowing the mobile station to easily update internal time information using a synchronized time. The SNTP can provide a time value which can be used to accurately reset an internal time of the mobile station of the asynchronous scheme. By using the SNTP, the mobile station of the asynchronous scheme can obtain exact time information as in a CDMA network and update the mobile station's internal time with the time corresponding to an area in which a standard time is changed.

Abstract: An apparatus and a method for supporting multiple links in a multi-hop relay cellular network using at least two frequency bands are provided. A subframe for a link on which a Mobile Station (MS) or a Relay Station (RS) communicates with a Base Station (BS) is configured in a first frequency band, and a subframe for a link on which the BS or the RS communicates with the MS is configured in a second frequency band.

Abstract: Disclosed is a cellular-based wireless communication system, and more particularly a method for allocating resources for data transmission in a cellular-based wireless communication system employing a multicarrier scheme. Frequency resources are divided into time slots defined by one frame and the divided time slots are allocated to an uplink and the downlink. During a predetermined time period, the frequency resources are allocated as resources for transmitting sync preambles. During a next predetermined time period, the frequency resources are allocated in such a manner that the frequency resources for sectors are successively and repeatedly used as resources for transmitting broadcasting messages on a sector-by-sector basis. In the remaining time slots, except the time slots for transmitting the preambles and the broadcasting messages, the frequency resources are allocated as resources for transmitting channel estimation midambles for dynamic channel allocation.

Abstract: Disclosed is a method for allocating data and pilots, a transmitting method and device, a receiving method and device in an OFDMA system. A terminal partitions subcarrier groups and symbols from an uplink channel based on a basic pilot pattern generated by a specific reference, receives at least one subchannel based on the partitioned subcarrier groups and symbols, hops the subcarrier groups caused by the subchannel according to hopping patterns, allocates data, and differently positions the pilots per subcarrier group based on the basic pilot pattern. Accordingly, the probability of pilot collision between adjacent cells is reduced, and accuracy of channel estimation is increased through boosting the pilot subcarrier power.