Abstract: A UE apparatus and method for feeding back Channel State Information (CSI) in a wireless communication system are disclosed. The UE apparatus includes a processor for determining a Rank Indicator (RI) for a predefined frequency band and selecting an index of a Precoding Matrix Indicator (PMI) corresponding to the determined RI from a codebook set used for a transmission on the predefined frequency band, and a transmission antenna for transmitting the RI and the index of the PMI to a Base Station (BS). The RI and the index of the PMI are jointly encoded prior to the transmission.

Abstract: A method and apparatus of transmitting a control signal in a multi-cell cooperative wireless communication system is provided. The method comprises transmitting to a first user equipment a first control signal for first downlink data by a serving base station and transmitting to the first user equipment a second control signal for second downlink data received from a neighboring base station by the serving base station, wherein the first downlink data is data for the first user equipment, and the second downlink data is data for a second user equipment in a neighbor cell and is restorable by the first user equipment.

Abstract: A wireless communications system and, more particularly, a method for uplink transmission control and an apparatus for the same in a wireless communications system are disclosed. In a method for performing uplink scheduling for a first user equipment by a first base station, the method includes the steps of receiving, from the first user equipment, information on a frequency band having an uplink interference occurring therein with respect to a second base station; and allocating an uplink resource for the first user equipment based upon the frequency band. Herein, the frequency band having an uplink interference occurring therein with respect to the second base station may be decided based upon uplink scheduling information on a second user equipment of the second base station, and the uplink scheduling information on the second user equipment of the second base station may be acquired by the first user equipment and transmitted to the first base station.

Abstract: The present invention is directed to a wireless communication system. Specifically, the present invention is directed to a method and apparatus for transmitting uplink control information through a Physical Uplink Shared Channel (PUSCH) at a user equipment, including receiving configuration information for periodic PUSCH transmission through a first protocol layer signaling, receiving information indicating activation or deactivation of the periodic PUSCH transmission through a second protocol layer signaling, wherein the second protocol layer is lower than the first protocol layer, and periodically transmitting the uplink control information through the PUSCH according to the configuration information if the periodic PUSCH transmission is activated.

Abstract: A data transmitting method in a wireless communication system is disclosed. In transmitting data by a base station to a user equipment communicating with a plurality of cells in a wireless communication system, the present invention includes receiving, from the user equipment, information on timing differences of signals received by the user equipment from a plurality of the cells, defining a subframe for the user equipment according to the timing differences, and transmitting the data to the user equipment via the defined subframe.

Abstract: Provided are a communication method for a cooperative multi-point and a wireless device using the same. The wireless device receives, from a first cooperative multi-point (CoMP) cell, a first physical downlink shared channel (PDSCH) in a first subframe of a first frequency band, and receives, from a second CoMP cell, a second PDSCH in a second subframe of a second frequency band. A portion or the entire first frequency band is overlapped with the second frequency band. A first start point at which the first PDSCH in said first subframe starts being scheduled is the same as a second start point at which the second PDSCH in said second subframe starts being scheduled.

Abstract: A method for receiving a downlink signal at a downlink reception entity in a wireless communication system, the method includes: receiving downlink control information by demodulating an advanced Physical Downlink Control Channel (PDCCH) of a first resource block (RB) pair of a RB bundle based on a downlink channel estimated by a first Demodulation Reference Signal (DMRS) in the first RB pair; and receiving downlink data by demodulating a Physical Downlink Shared Channel (PDSCH) of a second RB pair of the RB bundle based on a downlink channel estimated by a second DMRS in the second RB pair, wherein the same DMRS pattern is used for the first and the second DMRSs, and wherein antenna ports for the first and the second DMRSs are different.

Abstract: A method for feeding back channel information, the method including if one or more cells are configured, performing a first feedback process and a second feeding process. The first feedback process is configured to transmit channel information including rank information The second feedback process is configured to transmit channel information including rank information which is the same as the rank information of the first feedback process.

Abstract: A method of decoding a backhaul downlink signal of a relay station is provided. The method includes: receiving by the relay station a transmission rank value for a backhaul downlink from a base station through a high-layer signal; receiving control information from the base station through a control region; and decoding the control information, wherein the transmission rank value for the backhaul downlink is a transmission rank value assumed when the relay station decodes the control information, and wherein the control information is mapped to a resource element which does not overlap with a dedicated reference signal resource element mapped to the control region by assuming the transmission rank value for the backhaul downlink.

Abstract: A method of transmitting uplink control information of a user equipment in a wireless communication system is provided. The method includes: receiving reserved resource information that indicates a radio resource capable of transmitting the uplink control information; receiving a block subframe indicator that indicates a radio resource for transmitting a signal from a relay station to a base station; comparing a transmission-reserved subframe indicated by the reserved resource information with a block subframe indicated by the block subframe indicator; and transmitting the uplink control information in the transmission-reserved subframe if the transmission-reserved subframe does not overlap with the block subframe.

Abstract: The present invention relates to a method for transmitting a sounding reference signal and to an apparatus for said method. More particularly, the present invention relates to a method for transmitting a sounding reference signal and to an apparatus for said method, wherein the method comprising the following steps: receiving sounding reference signal parameters; allocating a wireless resource using the sounding reference signal parameters; and transmitting a sounding reference signal via the wireless resource, wherein said sounding reference signal is transmitted using a portion of a period of a single carrier-frequency division multiple access (SC-FDMA) symbol.

Abstract: A method of controlling uplink access in a wireless communication system is provided. The method includes: generating an access probability sequence consisting of an access probability determined with respect to a radio resource used for data transmission; transmitting data according to the access probability included in the access probability sequence; receiving a success/failure result on the data transmission; and regulating the access probability used in the data transmission according to the success/failure result. Accordingly, each user equipment performs a simple control process for attempting random uplink access according to an access probability sequence and for changing the access probability sequence according to success/failure of uplink data transmission, thereby decreasing a probability of collision between user equipments, thereby increasing data transmission efficiency in a system employing a plurality of user equipments.

Abstract: A method and an apparatus for receiving or transmitting a signal of a relay station in a wireless communication system are provided. The relay station receives or transmits a signal using radio resources indicated by backhaul resource allocation information. In this case, the radio resources include a plurality of symbols in a time domain, and the plurality of symbols have boundaries which are shifted based on symbols included in a frequency band allocated to a macro user equipment. And the radio resources include a plurality of subcarriers in a frequency domain, and at least one subcarrier adjacent to the frequency band allocated to the macro user equipment among the plurality of subcarriers is set to a guard subcarrier.

Abstract: A method of a user equipment feeling channel state information in a wireless communication system including receiving a reference signal from a base station; generating first channel state information by measuring the reference signal; generating second channel state information based on the first channel state information; and transmitting the first channel state information and the second channel state information to the base station. The first channel state information is channel state information of a single user single cell Multi-input Multi-Output (MIMO) mode, and the second channel state information is channel state information of a multi-user MIMO (MU-MIMO) mode or a Cooperative Multiple Points Transmission and Reception (CoMP) mode.

Abstract: The present invention provides a method for avoiding interference resulting from data transmission between an adjacent second base station and a second relay station placed within the coverage of the adjacent second base station.

Abstract: A method of transmitting a control signal of a relay station is provided. The method includes: receiving a control signal and data from a base station in a first subframe; and transmitting an acknowledgement/negative acknowledgement (ACK/NACK) signal for the data to the base station in a second subframe, wherein a radio resource for transmitting the ACK/NACK signal is determined by a radio resource to which the control signal received in the first subframe is allocated and by a logical physical uplink control channel (PUCCH) index received by using a higher layer signal.

Abstract: Provided are a method and apparatus for transmitting data in a wireless communication system. The method comprises the steps of: setting up a frame including both a control domain for transmitting scheduling information to a first terminal and a data domain for transmitting first data to the first terminal; and transmitting, to a second terminal, second data in the control domain. The frame comprises a plurality of orthogonal frequency division multiplexing (OFDM) symbols in a time domain. The control domain consists of a first number N (where N is any natural number equal to or less than 4) of OFDM symbols in the frame. The data domain consists of OFDM symbols other than a number N of OFDM symbols in the frame. The second data has a predetermined bit size.

Abstract: Disclosed is a relay. The relay includes: a reception unit configured to receive signals from a transmitter; a processor configured to estimate a channel with respect to the transmitter based on a pilot signal of the transmitter among receiving signals, remove the pilot signal from among the received signals, amplify the signals without the pilot signal according to the estimated channel, and insert a pilot signal of the relay into the amplified signals; and a transmitter transmitting the signals including the pilot signal of the relay under the control of the processor.

Abstract: The present invention relates to a data transmission/receiving method and apparatus for overcoming interference between multiple data streams, by relaying only part of multiple data streams that are received from a source node during collaborative data transmission employing relay nodes. The multiple data stream transmission method of the present invention comprises: receiving a plurality of data streams from a source node; decoding the plurality of data streams received; selecting a portion of the successful decoded data streams; encoding the selected portion of the data streams; and sending the encoded data stream portion to a destination node.

Abstract: A method of allocating uplink resources in a wireless communication system is provided. The method comprises generating a first message which has a preamble and adaptively further includes resource request information based on a communication state with a base station and transmitting the first message to the base station.