Abstract: A method for relaying data packets to a subscriber station (SS) by taking a relay station (RS) into consideration when a base station (BS) establishes a data packet scheduling is disclosed. According to the method, a data packet is relayed by RSs, which have a signal intensity greater than a threshold value for all RSs appointed by the BS. Each SS determines whether the SS receives the data packet directly from the BS or via an RS, based on signal intensities between the SS and the BS and between the SS and RSs, and feeds channel information corresponding to the determination back to the BS, thereby allowing the data packet to be transmitted.

Abstract: Disclosed is a method in a base station for providing a network access service to terminals. Where one of the terminals is selected as a source terminal and at least one of the other terminals is used as a relay node for relaying communication between the base station and the source terminal. Parameters for relay communication are initialized. A relay communication request message including that the parameters is transmitted. In response to the message, a terminal independently sets and performs the relay communication between the base station and the source terminal. Uplink signals are received from the source and relay terminals. The uplink signals received from the source and relay terminals are combined and decoded. A transmit diversity gain is obtained in uplink transmission of a terminal with a single antenna because relay nodes retransmit the source terminal's signal.

Abstract: A communication apparatus includes a mobile terminal to measure a downlink channel state of a downlink between a base station and the mobile terminal, and to determine whether to transmit feedback information about the downlink channel state to the base station based on the measured downlink channel state.

Abstract: A method and system for controlling power in a communication system are provided, in which an relay station calculates the capacity of a first channel between a base station and the relay station, an mobile station calculates the capacity of a second channel between the relay station and the mobile station, the mobile station notifies the relay station of the capacity of the second channel, and the relay station calculates a power control value according to the capacity of the first channel and the capacity of the second channel.

Abstract: A data encoding/decoding method in a multiple antenna communication system is provided. In the multiple antenna communication system, a transmitting end includes an encoder for performing Space Time Block Code (STBC) encoding on certain symbols among Transmit (Tx) symbols, a multiplexer for performing spatial multiplexing on the rest of symbols among the Tx symbols, and a transmitter for transmitting the STBC encoded symbols and the spatial-multiplexed symbols through a plurality of antennas.

Abstract: Provided are an apparatus and method for allocating resources in a mobile communication system. The apparatus includes a modulating/coding unit for modulating transmission data of one or more users according to a predetermined modulation scheme and for outputting a complex signal; a 2-Dimensional (2D)/1-Dimensional (1D) converter for converting the complex signal into a 1D signal; and a re-modulator for reconstructing the 1D signal to a 2D signal and for allocating two components of the 2D signal to two different frequency bands.

Abstract: An apparatus and method for selecting a Space-Time Coding (STC) scheme in a Multiple-Input Multiple-Output (MIMO) system are provided. Upon generation of a data transmission event, a transmitter receives a feedback signal, encodes transmission data using an STC scheme indicated by the feedback signal, and transmits the code symbols to a receiver, and the receiver measures interference factors of available STC schemes using the received code symbols, selects an STC scheme with a smaller interference factor, and notifies the transmitter of the selected STC scheme by a feedback signal.

Abstract: A method and system for transmitting and receiving data to prevent Adjacent Channel Interference (ACI) in a Cognitive Radio (CR) communication system are provided, in which a second system using a second frequency band measures a first channel interference that a first frequency band used by a first system causes to the second frequency band, determines a frequency spreading parameter according to the first channel interference, measures a second channel interference that the second frequency band causes to the first frequency band, receives link information from the first system according to the second channel interference, determines a power allocation map according to the link information and transmits and receives data according to the frequency spreading parameter and the power allocation map.

Abstract: An apparatus and method for allocating resources in multi-carrier wireless telecommunication system is provided. The apparatus comprises a scheduler for configuring a multicast channel by combining sub-carriers according to a multicast preference for each sub-carrier, and controlling resource allocation according to the configured multicast channel, and a sub-carrier mapper for inputting unicast data and multicast data to be transmitted, allocating the multicast data to the sub-carriers configuring the multicast channel under the control of the scheduler, and outputting the unicast data by allocating the unicast data to sub-carriers excluding sub-carriers allocated to the multicast channel.

Abstract: An apparatus and method for allocating a channel using an auction algorithm in a wireless communication system. The method includes measuring a data rate of each channel; selecting one of the channels, when information on the channels is received from a base station, using the received information on the channels and the measured data rate; and determining a bidding price of the selected channel. Performance of the entire system can be improved by reducing complexity as well as guaranteeing an optimal value in the channel allocation.

Abstract: A method and system for allocating resources to prevent inter-cell interference in a multi-cellular communication system, in which an interference period is detected by comparing a data transmission period in a first cell with a data transmission period in a second cell, the interference period is divided into a plurality of unit periods, each of the first cell and the second cell is divided into a plurality of unit areas corresponding to the unit periods, and resources of the unit periods corresponding to the unit areas are allocated to the unit areas.

Abstract: Disclosed is a method for efficiently allocating resources in a multi-cell communication system. The method includes feeding back, by a mobile station to a base station, Modulation and Coding Scheme (MCSs) corresponding to loading factors; calculating, by the base station, efficient data rates corresponding to the MCSs fedback from the mobile station; allocating, by the base station, a loading factor according to the MCSs to the mobile station; and allocating resources to the mobile station according to the loading factor.

Abstract: A method for allocating a sub-channel in a wireless communication system is disclosed. The method includes measuring a moving velocity of each of mobile stations (MSs); selecting MSs to which a sub-channel is to be allocated; determining a resource allocation period for sub-channel allocation to the MSs using the measured moving velocity; calculating an average amount of data to be transmitted for the determined resource allocation period, and sending a channel quality information (CQI) request to the MSs; upon receipt of CQI in response to the CQI request, allocating a sub-channel satisfying the average data amount taking the CQI into account; and transmitting a control signal for the sub-channel allocation to the MSs.

Abstract: A method is disclosed for relaying data between a Base Station (BS) and a Mobile Station (MS) through a relay station in a cellular network. In the data relay method, the relay station receives data from the BS and the MS, performs network coding on first data received from the BS and second data received from the MS using a predefined operator, generates a packet with the network-coded data, and transmits the packet to the BS and the MS through one wireless channel. Identification information indicating the network coding, identification information of the MS, sizes of the first and second data, and sequence numbers of the first and second data are recorded in a header of the packet.

Abstract: A communication method in a communication system includes a base station that transmits downlink information to a terminal through a frequency band of a first communication scheme for a downlink period. The terminal transmits uplink information to the base station through the frequency band of the first communication scheme or a frequency band of a second communication scheme that is different from the frequency band of the first communication scheme, for an uplink period.

Abstract: A method and apparatus for scheduling the data packets transmitted to a plurality of mobile terminals supporting multiple quality of service (QoS) grades in a multichannel wireless communication system includes a storage device for storing queues and data packets of the mobile stations, the queue and data packets of each of the mobile stations being arranged in an order of the quality of service grades; and a scheduler for allocating resources of multiple channels to the mobile stations based on different scheduling metrics separately applied to the multiple channels according to the quality of service grades, each of the scheduling metrics applied to a particular one of channels being used to select one of the mobile stations whose data packets are transmitted through the particular channel; wherein entire data packets of the mobile stations are transmitted through the multiple channels when the allocation of the channel resources has been completed sequentially for each of the multiple channels.

Abstract: A method for relaying data packets to a subscriber station (SS) by taking a relay station (RS) into consideration when a base station (BS) establishes a data packet scheduling is disclosed. According to the method, a data packet is relayed by RSs, which have a signal intensity greater than a threshold value for all RSs appointed by the BS. Each SS determines whether the SS receives the data packet directly from the BS or via an RS, based on signal intensities between the SS and the BS and between the SS and RSs, and feeds channel information corresponding to the determination back to the BS, thereby allowing the data packet to be transmitted.

Abstract: Disclosed is a method in a base station for providing a network access service to terminals. Where one of the terminals is selected as a source terminal and at least one of the other terminals is used as a relay node for relaying communication between the base station and the source terminal. Parameters for relay communication are initialized. A relay communication request message including that the parameters is transmitted. In response to the message, a terminal independently sets and performs the relay communication between the base station and the source terminal. Uplink signals are received from the source and relay terminals. The uplink signals received from the source and relay terminals are combined and decoded. A transmit diversity gain is obtained in uplink transmission of a terminal with a single antenna because relay nodes retransmit the source terminal's signal.

Abstract: A packet scheduling method using a cumulative distribution function. The scheduling method for use in a communication system including a plurality of MSs (Mobile Stations) and a central controller for assigning resources to individual MSs on the basis of a transmission rate associated with downlink channels fed back from the MSs, includes the steps of generating a uniform random variable of transmission rates of individual MSs; converting the uniform random variable into a scheduling priority; comparing the scheduling priority of each MS with each other; and assigning resources to a MS having the highest scheduling priority.

Abstract: A twist-correcting device for a wire rope isolator, the retaining bars of which may become twisted in the process of installing the conventional wire rope isolator between a platform and an apparatus, which makes it difficult to assemble the wire rope isolator and prevents the isolator from performing fully. The twist-correcting device includes a pair of clamps for correcting the twisting of the retaining bars of the isolator by holding the retaining bars closely parallel to each other at both end portions of the wire rope isolator. The twist-correcting device is capable of simplifying the installation of a wire rope isolator between a platform and an apparatus and enabling the wire rope isolator to perform at its best.