Abstract: In a communication system, a first Downlink (DL) signal to be commonly received by all Mobile Stations (MSs) at a Base Station (BS) is generated. A second DL signal that all the MSs do not need to commonly receive is generated. The first DL signal is applied to an interference cancellation scheme. The first DL signal is transmitted in a first time interval. The second DL signal is transmitted in a second time interval.

Abstract: Provided is an apparatus and method for allocating a preamble index of a Self-Configuration or Self-Configurable (SC) Base Station (BS) in a broadband wireless communication system. An SC BS apparatus in a broadband wireless communication system includes a detector, a controller, and a generator. The detector detects at least one preamble signal for preamble index allocation by using a signal received from at least one other BS. The controller requests information used by at least one other SC BS for preamble index allocation and allocates a preamble index for the SC BS by using the detection result of the preamble signal and the information received from the at least one other SC BS. The generator generates a preamble signal corresponding to the preamble index allocated by the controller.

Abstract: An apparatus and method for updating a neighbor list in a mobile communication system are provided. The system includes a Mobile Station (MS), a second Base Station (BS), and a first BS. The MS stores first log information, performs a network entry process with the second BS, and generates and transmits second log information to the second BS. The second BS allocates a bandwidth to the MS, receives the second log information, determines if neighbor list update is required using the second log information and, if the neighbor list update is required, updates a neighbor list and transmits the updated neighbor list information to the previous BS.

Abstract: An apparatus and method for beamforming of a terminal in a Multiple Input Multiple Output (MIMO) wireless communication system are provided. The method includes transmitting sounding signals beamformed through a plurality of beamforming weight vectors in sequence, receiving control information indicative of an uplink weight vector determined by a base station and a maximum channel quality value using the sounding signals and transmitting a transmit signal beamformed with the uplink weight vector via a plurality of antennas.

Abstract: An apparatus and method for allocating a preamble index to a self configurable base station in a broadband wireless communication system are provided. The apparatus comprises a first selector for selecting a segment IDentifier (ID) to be allocated to a Self Configurable-Base Station (SC-BS) by using a per-segment ID Received Signal Strength Indicator (RSSI) estimated by the SC-BS, a second selector for selecting an ID cell to be allocated to the SC-BS by using geographical location information of surrounding BSs, and a communicator for transmitting a segment ID and the ID cell to the SC-BS.

Abstract: A system and method for acquiring BS synchronization in a communication system are provided. In the system and method, a first BS acquires synchronization and transmits a frame to at least a second of the one or more neighbor BSs according to the synchronization, a second BS being the at least one neighbor BS estimates its first uplink frame synchronization time using a first arrival time of a downlink frame in the frame and transmits a first message at the first uplink frame synchronization time to the first BS, the first BS calculates a synchronization time difference by comparing a second arrival time of the first message with its uplink frame synchronization time and transmits a second message including the synchronization time difference to the second BS, and the second BS estimates a synchronization time using the synchronization time difference, acquires synchronization to the first BS, and transmits a frame generated with the same timing as the first BS.

Abstract: An apparatus and method for setting transmit power of a compact Base Station (BS) in a wireless communication system are provided. In the apparatus and method a measurer measures a signal strength corresponding to each of one or more neighbor BSs while operating in a Mobile Station (MS) mode, a receiver receives a signal strength corresponding to each of the one or more neighbor BSs measured by one or more MSs from the corresponding one or more MSs, and a self-configuration controller sets a target signal strength based on the signal strength corresponding to each of the one or more neighbor BSs measured in the MS mode and controls a transmit power so that the signal strength corresponding to each of the one or more neighbor BSs measured by the one or more MSs substantially reaches the target signal strength.

Abstract: An apparatus and method for dynamic frequency assignment to a low-power Base Station (BS) in a wireless communication system are provided. The method includes receiving a Received Signal Strength Indication (RSSI) measurement result for the whole Frequency Assignment (FA) and an available FA set of the BS from the BS newly entering a network, selecting an FA having a minimum RSSI among FAs included in the available FA set, and assigning the FA having the minimum RSSI to the BS.

Abstract: An apparatus and method for estimating a Carrier-to-Interference and Noise Ratio (CINR) in a communication system are provided.

Abstract: An apparatus and method for beamforming in a wireless communication system are provided. The base station apparatus includes a calculator, a plurality of formers, and a plurality of adders. The calculator calculates a beam coefficient considering interference to a neighbor sector to be applied to transmission signals to mobile stations. The plurality of formers performs beamforming for a transmission signal to each mobile station within a corresponding sector using the beam coefficient. The plurality of adders adds the sector-based beamformed signals each provided from the plurality of formers, on a per-transmission-antenna basis.

Abstract: An apparatus for controlling a gain of transmit antennas in a communication system. The transmit antenna gain control apparatus includes a controller for determining a gain of multiple transmit antennas on a basis of a transmit antenna having a minimum currently unused residual power among currently unused residual powers of the multiple transmit antennas used in the communication system.

Abstract: Disclosed is a method for transmitting/receiving a downlink signal for improving a reception capability of a mobile station in a communication system. In the method, downlink signals are transmitted such that a downlink signal having a first Modulation and Coding Scheme (MCS) level applied thereto is first transmitted, and then the downlink signals are transmitted in a sequence in which a downlink signal having an MCS level showing a smallest difference between its MCS level and the first MCS level is transmitted prior to remaining downlink signals.

Abstract: Provided is an apparatus and method for power allocation in a Space Division Multiple Access (SDMA) system. The apparatus includes an encoder, an antenna weighting calculator, and an antenna. The antenna weighting calculator divides a transmission power of a Base Station (BS) by number of Mobile Stations (MSs), fixedly distributes the divided transmission powers to the MSs, calculates a surplus power of each MS, sums up the calculated surplus power to thereby calculate a total surplus power, calculates a power per MS needed for an MPR one level higher, determines whether there is an MS whose power needed for a next level MPR is smaller than the total surplus power, and additionally allocates the total surplus power when there is the MS.

Abstract: A method and apparatus is provided for transmitting/receiving a signal in a base transceiver station (BTS) of a communication system. The BTS compares power of a channel quality information (CQI) signal received from a terminal with power of a CQI signal for the terminal, received from a repeater, and performs a control operation so as to transmit a signal to be transmitted to the terminal directly to the terminal or transmit the signal to the terminal via the repeater according to the comparison result.

Abstract: In a communication system, a first Downlink (DL) signal to be commonly received by all Mobile Stations (MSs) at a Base Station (BS) is generated. A second DL signal that all the MSs do not need to commonly receive is generated. The first DL signal is applied to an interference cancellation scheme. The first DL signal is transmitted in a first time interval. The second DL signal is transmitted in a second time interval.

Abstract: A method is provided for uplink scheduling for a mobile station (MS) in a base station (BS) in a wireless mobile communication system in which the MS sends channel quality information to the BS. At least two logical regions are set to control transmission power of the MS and the number of sub-channels to be allocated to the MS according to an interference level at which a signal of the MS affects an adjacent cell/sector. The BS allocates the MS to a specific logical region while considering channel quality information of the MS. When the specific logical region is mapped to a set of MSs whose interference to the adjacent cell/sector is large, the BS limits the transmission power of the MS and the number of sub-channels to be allocated to the MS to predefined reference values or less.

Abstract: A method is provided for transmitting data based on an Adaptive Modulation and Coding (AMC) technique in a Broadband Wireless Access (BWA) communication system. The method includes: measuring a channel quality information (CQI) difference for each of mobile stations (MSs) according to channel information fed back from the MSs; estimating a moving velocity of each of the MSs according to the CQI difference; selecting a mapping table for each individual MS taking into account the estimated velocity of each of the MSs, and allocating the selected mapping table; and transmitting data to a corresponding MS by applying a modulation scheme and a coding rate corresponding to the mapping table.