Abstract: A method of transmitting an acknowledgment (ACK)/non-acknowledgement (NACK) signal in a wireless communication system includes assigning at least one ACK channel among a plurality of ACK channels which share an ACK channel region for transmitting the ACK/NACK signal, and transmitting the ACK/NACK signal through the at least one ACK channel, wherein the ACK channel region includes at least one tile including a plurality of data subcarriers, and the ACK/NACK signal of each ACK channel is indicated by mapping different orthogonal vectors respectively to the plurality of ACK channels in the tile.

Abstract: A method for reducing inter-cell interference and a method for transmitting a signal by a collaborative MIMO scheme, in a communication system having a multi-cell environment are disclosed. An example of a method for transmitting, by a mobile station, precoding information in a collaborative MIMO communication system includes determining a precoding matrix set including precoding matrices of one more base stations including a serving base station, based on signal strength of the serving base station, and transmitting information about the precoding matrix set to the serving base station. A mobile station in an edge of a cell performs a collaborative MIMO mode or inter-cell interference mitigation mode using the information about the precoding matrix set collaboratively with neighboring base stations.

Abstract: A terminal unit for receiving a hybrid automatic retransmission request (HARQ) feedback using a frequency division duplex (FDD) frame comprises: a receiver, which receives an uplink assignment information element (A-MAP IE) for allocating each uplink through each downlink subframe of a first frame from a base station; a processor, which performs a process for transmitting uplink data that corresponds to the received A-MAP IE for allocating each uplink for a predetermined processing time: a transmitter, which transmits the processed uplink data to the base station from the respective downlink subframes having received the A-MAP IE for allocating each uplink, through each corresponding uplink subframe, after the predetermined processing time has lapsed; and a receiver, which receives, from the base station, the downlink HARQ feedback for each uplink data through each uplink subframe that has, in a third frame, the same index as the index of each downlink subframe where the A-MAP IE for allocating each uplink ha

Abstract: A method is disclosed for avoiding inter-cell interference in a closed-loop multiple-input multiple-output (MIMO) system using a plurality of codebooks. A base station of a serving cell transmits information about codebooks used in an interfering cell among the plurality of codebooks to a mobile station. The transmission of the information may be made at the request of the mobile station. Alternatively, the mobile station may directly measure information about codebooks used in the interfering cell among the plurality of codebooks. The mobile station measures restricted precoding matrix indexes (PMIs) or requested PMIs based on the codebook information. The measured PMIs are transmitted to the interfering cell and are used to restrict the use of a PMI in the interfering cell.

Abstract: Disclosed are an apparatus and a method for performing communication using a half-frequency division duplex (H-FDD) frame structure in a mobile communication system. A user equipment for performing communication using an H-FDD frame structure according to the present invention comprises an RF unit in which each user equipment group receives and transmits signals using the H-FDD frame structure wherein the order of the downlink zone and uplink zone are reversely allocated to each of the groups. The downlink zone and uplink zone, which are allocated to each of the user equipment groups in the H-FDD frame structure, include a sub-frame wherein one or more symbols are allocated to idle time slots or are punctured. Each of the user equipment groups can receive and transmit signals using symbols that are not allocated to the idle time slots or are not punctured in the sub-frame.

Abstract: A method and apparatus for transmitting data performed by at least one base station (BS) in a wireless communication system is provided. First signals are respectively mapped to a first Orthgonal Frequency Division Multiplexing (OFDM) symbol of a first BS and a second BS, and are transmitted. A second signal, having a ? shifted phase of the first signal, is mappped to a second OFDM symbol, and is transmitted by the first BS. The respective first signals and the second signal are transmitted in a same subcarrier in a frequency domain.

Abstract: A method for reducing inter-cell interference and a method for transmitting a signal by a collaborative MIMO scheme, in a communication system having a multi-cell environment are disclosed. An example of a method for transmitting, by a mobile station, precoding information in a collaborative MIMO communication system includes determining a precoding matrix set including precoding matrices of one more base stations including a serving base station, based on signal strength of the serving base station, and transmitting information about the precoding matrix set to the serving base station. A mobile station in an edge of a cell performs a collaborative MIMO mode or inter-cell interference mitigation mode using the information about the precoding matrix set collaboratively with neighboring base stations.

Abstract: A method for performing communication using a frame structure that supports a half-frequency division duplex (H-FDD) operation and a device using the same are disclosed. A base station performs resource allocation scheduling to support H-FDD user equipment operation in a mobile communication system. For example, the base station allocates first, second and last uplink subframes for idle subframes within a specific frame or punctures them, so that the H-FDD user equipment does not use the uplink subframes. The base station transmits the scheduled resource allocation information to the user equipment through a superframe header, a preamble and a MAP. The user equipment which has received the scheduled resource allocation information (subframe index and location that can be used by the user equipment) transmits and receives a signal based on the resource allocation information.

Abstract: A method and MS apparatus for receiving a signal in a wireless communication system supporting a plurality of wireless communication schemes are disclosed. The method for receiving a signal in a wireless communication system supporting both communication of a first MS using a first wireless communication scheme and communication of a second MS using a second wireless communication scheme includes receiving from a BS a downlink signal in a downlink subframe allocated to a second zone dedicated to communication of the second MS in a downlink zone of a specific frame by the second MS. The number of downlink subframes allocated to the second zone by the BS is one, the allocated downlink subframe is a first downlink subframe of the second zone, and the first downlink subframe of the second zone is a Type-2 subframe which consists of seven OFDMA symbols.

Abstract: A method for avoiding an inter-cell interference (ICI) in a multi-cell environment is disclosed. The method includes restricting the use of a PMI in an interfering cell so as to improve a reception performance of a mobile station located at an interfered cell edge. The mobile station measures a restricted-PMI of the interfering cell, which is prohibited from use in the interfering cell, and transmits the measured restricted PMI to the interfering cell. The use of the restricted PMI is prohibited from use in a mobile station in the interfering cell.

Abstract: A method of a Relay Station (RS) transmitting and receiving a signal in a wireless communication system including the RS, comprising receiving frame configuration information about an RS frame from a Base Station (BS), configuring a downlink (DL) access zone in which a signal is transmitted to a relay Mobile Station (MS) connected to the RS and a DL relay zone in which a signal is received from the BS in the RS frame on the basis of the frame configuration information, comparing a time necessary to switch an operation from the DL access zone to the DL relay zone and a propagation delay time taken to receive the signal from the BS, configuring some symbols of the DL access zone or the DL relay zone as a transition time according to a result of the comparison, transmitting the signal to the relay MS in the DL access zone, and receiving the signal from the BS in the DL relay zone.

Abstract: The present invention relates to configuration procedures and transmission of a ranging channel for a synchronization of an uplink of user equipment and a relay station in a communication system which supports a relay, in that the configuration of the ranging channel for acquiring an uplink synchronization may vary in accordance with a variety of frame structures, thereby reducing uplink interferences and performing an uplink synchronization in a stable and quick manner.

Abstract: A method and apparatus for transceiving signals using a predetermined frame structure in a wireless communication system is provided. The apparatus includes a Radio Frequency (RF) unit for transceiving a signal through a frame according to the predetermined frame structure. The frame includes 5 subframes, the 5 subframe comprise type-1 subframes including 6 Orthogonal Frequency Division Multiplex Access (OFDMA) symbols and type-2 subframes including 7 OFDMA symbols, and a Cyclic Prefix (CP) length of the frame corresponds to ? of an effective symbol length.

Abstract: A method of transmitting a signal using a prescribed frame structure in a wireless communication system is disclosed. A mobile station is able to transmit or receive a signal using a frame structure with a CP length corresponding to ¼ of a useful symbol. Moreover, the mobile station is able to transmit or receive a signal using a frame structure with a CP length corresponding to ¼ of a useful symbol, which is designed to mutually coexist without causing collision or interference with another frame structure with a different CP length. In this case, a channel bandwidth of the prescribed frame structure is 8.75 MHz.

Abstract: A method of transmitting a signal using a prescribed frame structure in a wireless communication system is disclosed. A mobile station can transmit or receive a signal using a frame structure with a CP length corresponding to ¼ of a useful symbol. Moreover, the mobile station can transmit or receive a signal using a frame structure with a CP length corresponding to ¼ of a useful symbol.

Abstract: A method for allocating fractional frequency reuse (FER) resources to perform cooperative MIMO in a multi-cell environment is disclosed. A cell which requests FER resources decides a band for cooperative MIMO with its neighboring cell, and requests the neighboring cell to allocate the decided band for cooperative MIMO. A cell which receives FER resource request receives a request from a neighboring cell to allocate some or all of FER bands allocated to the neighboring cell as a band for cooperative MIMO, decides whether to grant the request, and allocates some or all of the requested FER bands as the band for cooperative MIMO with the neighboring cell if the request is granted.

Abstract: Provided are a method and device for allocating wireless resources in a wireless communication system. The wireless resource allocating method comprises allocating a machine type communication (MTC)-dedicated wireless resource and a general wireless resource, and communicating with at least one MTC device through the MTC-dedicated wireless resource. Herein, the MTC-dedicated wireless resource supports only the communication with the at least one MTC device, and the MTC-dedicated wireless resource and the general wireless resource may be different from each other.

Abstract: A method for transmitting a signal using a frame having a predetermined cyclic prefix (CP) in a wireless communication system is disclosed. The method for transmitting a signal using a frame having a predetermined cyclic prefix (CP) length in a wireless communication system that supports a plurality of cells comprises receiving the signal using a first frame from a base station; and transmitting the signal to the base station using the first frame, wherein the first frame is supported by a first cell of the plurality of cells and is different from a second frame supported by a second cell of the plurality of cells, the first frame has a structure where a overlap region between an uplink region of the first frame and a downlink region of the second frame or an overlap region between a downlink region of the first frame and an uplink region of the second frame is punctured, and a CP length of the first frame is different from that of the second frame.

Abstract: A method of controlling interference in a wireless communication system is disclosed. A method for controlling interference by a transmitter of a wireless communication system with multiple antennas comprises generating a base codebook subset including at least one precoding matrix selected from a base codebook; transmitting a base codebook subset indication, which represents the at least one precoding matrix included in the base codebook subset, to a receiver; and precoding data using the base codebook subset or the base codebook.

Abstract: A method of transmitting information necessary for performing collaborative multi input multi output (MIMO) operation between a mobile station and a base station in order to improve reception performance of the mobile station in a multi-cell environment is provided. The mobile station may receive a feedback channel for the collaborative MIMO which is allocated by a serving base station and transmit a collaborative MIMO indicator including information indicating that the collaborative MIMO is started to the serving base station. In addition, the mobile station may transmit the feedback information of each of the serving base station and a collaborative base station to the serving base station through the feedback channel, and the serving base station may transmit the feedback information to the collaborative base station via a backbone network. The mobile station may receive the collaborative MIMO supported by the serving base station and the collaborative base station.