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 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 and apparatus of relaying data in a wireless communication system is provided. A relay station (RS) receives relay zone allocation information. A plurality of relay zones is allocated in a resource region by the relay zone allocation information. The relay station receives data transmitted from a super-ordinate station, detects a tunneling traffic destined to a subordinate station from the data, and transmits the tunneling traffic to the subordinate station. The tunneling traffic is transmitted over one of the plurality of relay zones.

Abstract: A method of transmitting a signal of a mobile station that performs communication with a plurality of cells in a wireless communication system comprises transmitting a control signal or a data signal through an asynchronous channel to a neighboring cell which is not synchronized with the mobile station, the asynchronous channel including cyclic prefix and guard time.

Abstract: A data transmission method in a system comprising at least one or more relays includes transmitting by a mobile station a bandwidth allocation request message to a relay, receiving by the mobile station a bandwidth allocation message from the relay, the bandwidth allocation message including information for indicating an offset from a frame where the bandwidth allocation message is contained, waiting by the mobile station for an uplink frame or uplink subframe indicated by the offset from the frame where the bandwidth allocation message is contained, and transmitting data on the indicated frame or subframe.

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: The present invention relates a method for transmitting and receiving data in a mobile communication system. More specifically, the invention relates to a method through which a terminal in a cell boundary receives data in a mobile communication system that supports MIMO (Multi Input Multi Output). The method comprises: a step for receiving a first data stream transmitted through multiple transmission antennas from a serving base station, a step for pre-coding a second data stream to make the time delay of the second data stream be different from that of the first data stream and receiving the second data stream from a collaborating base station, and a step for restoring the data based on the first and second data streams.

Abstract: The present invention relates to a method for providing control information in a mobile communication system. More specifically, the invention relates to a method for providing control information through a network in mobile communication. The method comprises: a step for configuring the information associated with plural frequency resource groups and the power levels thereof in the control information of preset data format, wherein the plural frequency resource groups are for application of FFR (Fractional Frequency Reuse), and a step for transmitting the control information to at least one terminal.

Abstract: A method of transmitting data in a multiple antenna system, including: transmitting a channel estimation signal including a first pilot for channel estimation of a first UE supporting multiple antennas and a second pilot for channel estimation of a second UE supporting a larger number of multiple antennas than that of the first UE; and receiving feedback data in response to the channel estimation signal.

Abstract: A method of data transmission in a wireless communication system having multiple antennas is disclosed. A method of data transmission from a transmitter of a wireless communication system which uses multiple antennas comprises receiving identification information of a precoding matrix from a receiver, the precoding matrix being selected from a codebook generated using a plurality of first matrixes generated by multiplying a discrete fourier transform (DFT) matrix by each of a plurality of phase shift matrixes; precoding data to be transmitted, by using a precoding matrix indicated by the identification information; and transmitting the precoded data to the receiver by using the multiple antennas.

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 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: 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: 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: A method of transmitting an uplink (UL) control signal of a relay station is provided. The method includes: configuring a UL relay zone for transmitting a signal by the relay station to a base station in a frame; configuring a resource unit including a plurality of symbols and a plurality of subcarriers to allocate the UL control signal in a subframe of the UL relay zone; and transmitting the UL control signal by using the resource unit, wherein, if a transition gap required for switching of signal transmission and reception of the relay station is included in the subframe, the UL control signal is transmitted in the remaining symbols other than the plurality of symbols constituting the resource unit including the transition gap.

Abstract: A method of transmitting a frame of a relay station (RS) in a wireless communication system employing the RS is provided. The method includes: receiving frame configuration information on an RS frame from a base station (BS); configuring a frame including a downlink (DL) access zone for transmitting a signal to a relay user equipment (UE), a DL receive zone for receiving a signal from the BS, an uplink (UL) access zone for receiving a signal from the relay UE connected to the RS, a UL transmit zone for transmitting a signal to the BS, and a transition gap; and transmitting a signal in at least one of the UL access zone and the UL transmit zone, wherein the transition gap is a switching time between a transmission operation and a reception operation of the RS and is included in at least one of the DL access zone and the UL transmit zone.

Abstract: A method for transmitting and receiving control information in a wireless communication system is disclosed.

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 for transmitting and receiving data in a cooperative Multiple-Input Multiple-Output (MIMO) mobile communication system is disclosed. The method includes selecting a transmission path for transmitting precoding-related feedback control information to one or more cooperative base stations operating in the cooperative MIMO mode, and transmitting the precoding-related feedback control information to the one or more cooperative base stations through the selected transmission path.

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.