Abstract: The present invention relates to a wireless access system, and more particularly, to an initial system under a multi-carrier combination condition. A method of for performing an initial access in a base station which supports the multi-band of a terminal according to one embodiment of the present invention comprises the steps of: searching one or more downlink component carriers of the base station; receiving system information including a broadcast channel of a first downlink component carrier from among the searched one or more downlink component carriers and information for indicating one or more uplink component carriers connected to the first downlink component carrier; transmitting a first message to the base station through a first uplink component carrier from among one or more uplink component carriers indicated by the received system information; and receiving a second message including uplink authorization information from the base station through the first downlink component carrier.

Abstract: Provided are a method and an apparatus for information transmission that is performed by a transmitter in a wireless communication system. The method comprises the steps of: acquiring a first resource index and a second resource index; generating information sequences based on the first resource index and the second resource index; and transmitting the information sequences via a first antenna and a second antenna, wherein the second resource index is acquired from the first resource index and the offset.

Abstract: A data transmitting and receiving method of transmitting supplementary data in an OFDM communication system is disclosed. The method of transmitting and receiving the OFDM signal includes: mapping an input bit stream into at least one transfer symbol; changing at least one of amplitudes and phases of the transfer symbols that are transmitted by a specific sub-carrier group having a plurality of sub-carriers using constellation modification information to indicate specific additional data; and transmitting the transfer symbols, to which the changing is carried out, to a receiving end by an orthogonal frequency division multiplexing data processing, the constellation modification information being identical to each other with respect to the transfer symbols that are transmitted by the specific sub-carrier group.

Abstract: A device and method for communicating by a mobile communication terminal in communication with a base station. The method according to an embodiment includes exchanging a frame of data with the base station. The frame of data includes a) a plurality of first subframes each having a first number of orthogonal frequency division multiple access (OFDMA) symbols, and b) a plurality of second subframes each having a second number of orthogonal frequency division multiple access (OFDMA) symbols different from the first number. A first and a last subframe each includes one of the plurality of first subframes.

Abstract: Disclosed are a device and method for transmitting or receiving the system information. The system information transmitting device comprises a processor for transmitting the system information on a broadcast channel, and the system information comprises multi-carrier information relating to a multi-carrier operation.

Abstract: A wireless apparatus for a multi-carrier system is disclosed. The wireless apparatus comprises; a control channel unit which monitors a control channel transmitted via at least one carrier from among a plurality of carriers; and a data channel unit which transmits or receives data packets to or from a data channel using the resource allocation received from the control channel. The control channel unit monitors the control channel in a plurality of search space in a subframe.

Abstract: A method of receiving a signal at a user equipment (UE) from at least two cells in wireless communication system is disclosed. Receiving module may receive data and at least one reference signal from a CoMP (Coordinated Multi-Point) set including at least two cells. Decoding module may decode the received data and the received at least one reference signal. In this case, a power level of the data is same as a power level of the at least one reference signal, or a power ratio between the data and the at least one reference signal is a scaled value. Also, the power level of the data and the at least one reference signal are same for each of the at least two cells. A power ratio between the data and the at least one reference signal is a same scaled value for each of the at least two cells.

Abstract: The present invention relates to a method for transmitting pilot signals in a downlink multiple-input multi-output (MIMO) system which supports a first user equipment (UE) for supporting an N number of transmitter antennas from among a total M number of transmitter antennas, and a second UE for supporting said M (wherein, M>N) number of transmitter antennas. The method comprises the steps of: enabling a base station to map pilot symbols in a resource block (RB) on a subframe for transmitting user-specific pilot symbols which can be recognized only by the second UE; and enabling the base station to transmit the subframe in which the pilot symbols are mapped. The cell-specific pilot symbols for transmitter antenna port 0 to N?1, which can be recognized by both the first UE and the second UE, and the user specific pilot symbols for transmitter antenna ports N to M?1, which can be recognized only by the second UE, are mapped in the allocated resource block.

Abstract: A method for identifying a MBSFN (Multimedia Broadcast multicast service Single Frequency Network) subframe at a user equipment (UE) in a wireless communication system is disclosed. Receiving module may receive receiving a subframe type information from an base station (BS). Receiving module may receive type information of the MBSFN subframe. The identifying module may identify an index of a MBSFN subframe based on the received subframe type information. The identifying module may identify a type of the MBSFN subframe based on the received type information of the MBSFN subframe. Decoding module may decode only a physical control channel region of the MBSFN subframe based on the identified type of the MBSFN subframe. Alternatively, Decoding module may decode the MBSFN subframe if the identified type of the MBSFN subframe is a decodable type or a known type.

Abstract: The present invention relates to a method for transmitting control information by a terminal in a wireless mobile communication system using multiple uplink carriers. The method for transmitting control information comprises: multiplexing a first control information to be assigned to a first uplink control channel and a second control information to be assigned to a second uplink control channel; and transmitting the multiplexed first and second control information via an uplink channel that is allocated to one of the multiple uplink carriers. Here, the first uplink control channel and the second uplink control channel are respectively allocated to different uplink carriers.

Abstract: A method and apparatus for receiving and transmitting signals in a wireless communication system are provided. The method of receiving signals includes configuring a system mode and receiving the signals according to the system mode, wherein the system mode is either a first system mode or a second system mode, when the system mode is the first system mode, the signals are transmitted through a maximum of N transmit antennas, and when the system mode is the second system mode, the signals are transmitted through a maximum of M (N<M) transmit antennas.

Abstract: The present invention relates to a method for synchronizing multiple cells, which perform cooperative multi-input multi-output operations, as well as to a method for inter-cell synchronization in a multi-cell environment, comprising the steps of: measuring a propagation delay of a cooperative base station; transmitting the measured propagation delay to a serving base station; and receiving data for cooperative multi-input multi-output operations in which a transmission location is adjusted, on the basis of the propagation delay of the cooperative base station, when the serving base station transmits the propagation delay to the cooperative base station.

Abstract: The present invention provides a method which determines an adjacent cell to carry out a coordinate multipoint transmission (CoMP) operation instead of performing the CoMP operation for all adjacent cells, in cases where precoding matrix indexes (PMI) of adjacent cells are limited to prevent interferences by adjacent cells in a multi-cell environment, thereby effectively reducing inter-cell interferences without causing an overhead.

Abstract: The present invention relates to a broadband wireless access system, and more particularly, to a frame structure to which OFDM symbols having a cyclic prefix are transmitted. A method of constructing a frame in a broadband wireless access system according to one embodiment of the present invention comprises including one or more first subframes in the frame, the first subframes including a plurality of symbols having a cyclic prefix of a first length; and including one or more second subframes in the frame, the second subframes including a plurality of symbols having a cyclic prefix of a second length different from the first length, wherein the number of the first subframes and the number of the second subframes are determined considering an idle time for which effective symbols are not included in the frame.

Abstract: The present invention relates to a wireless connection system, and more specifically to a method for efficiently transmitting a control channel in a multi-carrier aggregation state. According to one aspect of the invention, a method for enabling a terminal to transmit data in a broadband wireless connection system that supports multiband comprises the steps of: receiving uplink acknowledgement information from a base station through a first downlink component carrier among plural downlink component carriers available in the terminal; transmitting data to the base station through an uplink resource indicated by the uplink acknowledge information; and receiving feedback information from the base station through the first control channel of the first downlink component carrier, wherein the feedback information indicates whether there is an error in the reception of the transmitted data.

Abstract: A method of transmitting subframe designating information in downlink in a wireless communication system is disclosed. The present invention includes generating the subframe designating information for designating a subframe of a specific type in a radio frame and transmitting the generated subframe designating information to a user equipment, wherein the subframe designating information includes initial location information indicating an initial location of the subframe of the specific type on the radio frame and period information indicating a period for the subframe of the specific type to be repeated.

Abstract: A method for transmitting a transport block includes segmenting the transport block into code blocks corresponding in number to a multiple of the number of layers to be used for the transmission of the transport block, attaching a Cyclic Redundancy Check (CRC) to the segmented code blocks, sequentially mapping the code blocks to which the CRC has been attached to at least one layer according to a predetermined mapping rule, and transmitting the code blocks.

Abstract: A method of mapping transport sequences to component carriers in a wireless communication system is disclosed. A method of mapping transport sequences to a plurality of component carriers in a transmitter of a wireless communication system that supports carrier aggregation comprises changing the order of the transport sequences in accordance with mapping information; and transmitting the transport sequences of which order has been changed, to a receiver through the plurality of component carriers.

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 repsectively 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 repective first signals and the second signal are transmitted in a same subcarrier in a frequency domain.

Abstract: The present invention provides a data transmission device and method in a wireless communication system. The device comprises a processor which is connected with the M antennas and which is formed so as to generate data to be transmitted through the M antennas, on the basis of a precoding matrix; the precoding matrix is generated based on a plurality of matrices; and a first matrix, which is one matrix among the plurality of matrices, is selected from within a codebook for N antennas (where N<M).