Abstract: Provided are a method and device for allocating a downlink control channel in a wireless communication system. A base station allocates an enhanced physical control format indicator channel (e-PCFICH) to a control region of a plurality of resource blocks (RBs), transmits, to a terminal, an enhanced physical downlink control channel (e-PDCCH) indicator including information for indicating the start position of an e-PDCCH allocated to a data region of the plurality of RBs, and allocates the e-PDCCH to the data region of the plurality of RBs on the basis of the e-PDCCH indicator.

Abstract: A method and an apparatus for transmitting a synchronization signal in a wireless communication system are provided. A base station transmits a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) to a terminal through a macro node, and transmits a third synchronization signal (TSS) to the terminal through at least one radio remote head (RHH) having a cell identity (ID) that is identical to the macro node. The terminal performs synchronization based on at least one of the PSS, the SSS, and the TSS.

Abstract: A method for correcting errors in a multiple antenna system based on a plurality of sub-carriers and a transmitting/receiving apparatus supporting the same are disclosed. The method includes determining a phase shift based precoding matrix phase shifted at a predetermined phase angle, initially transmitting each sub-carrier symbol to a receiver in a packet unit by using the phase shift based precoding matrix, reconstructing the phase shift based precoding matrix to reduce a spatial multiplexing rate if a negative reception acknowledgement (NACK) is received from the receiver, and retransmitting the initially transmitted sub-carrier symbol by using the reconstructed phase shift based precoding matrix or by changing the phase shift based precoding matrix using offset information fed back from the receiver or random offset information.

Abstract: Provided are a method and an apparatus for searching control information by a terminal. The method comprises the steps of: acquiring from a base station, by means of a physical downlink control channel (PDCCH) or an upper layer message, at least one type of information being from location information on a physical control format indication channel (E-PCFICH) or location information on an E-control region; receiving the E-PCFICH based on the E-PCFICH location information; acquiring size information on the E-control region by means of the E-PCFICH; and searching E-PDCCH in the E-control region.

Abstract: A method of transmitting an uplink reference signal of a user equipment (UE) in a multi-node system is described. The method according to an embodiment includes receiving a synchronization signal from a node; receiving a parameter for a virtual cell identifier(ID) from the node; generating an uplink demodulation reference signal(DM-RS) using the parameter for the virtual cell ID; and transmitting the generated uplink DM-RS to the node. A physical cell ID is a cell ID obtained from the synchronization signal, and the parameter for the virtual cell ID is a parameter used for generating the uplink DM-RS in the replacement of the physical cell ID.

Abstract: A method and an apparatus for mapping a bit of an enhanced physical downlink control channel (e-PDCCH) in a wireless communication system are provided. A base station maps an e-PDCCH bit on a first region to which the e-PDCCH is allocated from a data region within a subframe, and maps a redundant bit of the e-PDCCH bit on a second region, which is between a control region and the first region within the subframe, including at least one orthogonal frequency division multiplexing symbol (OFDM). The e-PDCCH bit is mapped from a kth OFDM symbol within the subframe in the direction of an increasing OFDM symbol index, and the redundant bit is mapped from a (k?1)th OFDM symbol in the direction of a decreasing OFDM symbol index.

Abstract: Provided are a method of transmitting a signal of a multi-node system. The method includes: transmitting a first signal to a user equipment via the plurality nodes by applying a first power factor; receiving power feedback information as a feedback from the user equipment; and transmitting a second signal to the user equipment via at least one node among the plurality of nodes by applying a second power factor, wherein the first power factor and the second power factor are elements for determining transmit power to be applied to the plurality of nodes, wherein the power factor information includes information for transmit power applicable to each of the plurality of nodes by measuring the first signal, and wherein the second power factor is determined based on the power factor information.

Abstract: Disclosed are a method and an apparatus for channel estimation in a multi-node distributed system. A method for channel state estimation comprises the steps of: a terminal receiving channel state information reference signal (CSI-RS) set-up information; and the terminal calculating interference on the basis of the CSI-RS set-up information and then transmitting channel state information (CSI) based on the interference, wherein the CSI-RS set-up information may include at least one of an external interference measurement field and an internal interference measurement field. Accordingly, during the external interference and internal interference measurements, the node for use in the interference measurements may be controlled by a base station so that interference is accurately measured and feedback of accurate channel information is enabled.

Abstract: Provided are a method and an apparatus for reporting a channel quality indicator (CQI) in a multi-node system. A terminal measures the CQI on the basis of a final interference power in which interference from at least one node among a plurality of nodes, from which the terminal receives signals, is reduced, and reports the measured CQI to a base station. Improvement of system performance, such as a data rate increase can be expected.

Abstract: The present invention relates to a method and device for measuring interference in a wireless communication system. User equipment (UE) receives interference measuring indicators form a base station and measures interference based on the interference-measuring indicators by using all or some resource elements (RE) that correspond to zero-power channel state information (CSI) reference signal (RS) configurations.

Abstract: Provided are a method and an apparatus for downlink control channel allocation in a wireless communication system. A base station allocates a downlink control channel which supports a multi-node system to a data region within an resource block (RB), and transmits a downlink control signal to a user equipment through the allocated downlink channel. The multi-node system comprises a plurality of nodes connected to one macro node, and the macro node and the plurality of nodes have the same cell identifier (ID).

Abstract: Provided are a method for operating a user equipment in a wireless communication system and the user equipment for performing same. The user equipment receives a plurality of channel state information (CSI) reference signal (RS) configurations for indicating different usages, and performs an action based on each of the CSI RS configurations.

Abstract: Provided are a method and apparatus for transmitting feedback information of a terminal in a multi-node system in which a plurality of antennas are distributed and disposed in a cell. The method comprises the steps of: transmitting first feedback information, indicating a state between a channel and at least one of antennas, to a base station; and transmitting second feedback information, indicating at least one antenna, to the base station.

Abstract: A method for correcting errors in a multiple antenna system based on a plurality of sub-carriers and a transmitting/receiving apparatus supporting the same are disclosed. The method includes determining a phase shift based precoding matrix phase shifted at a predetermined phase angle, initially transmitting each sub-carrier symbol to a receiver in a packet unit by using the phase shift based precoding matrix, reconstructing the phase shift based precoding matrix to reduce a spatial multiplexing rate if a negative reception acknowledgement (NACK) is received from the receiver, and retransmitting the initially transmitted sub-carrier symbol by using the reconstructed phase shift based precoding matrix or by changing the phase shift based precoding matrix using offset information fed back from the receiver or random offset information.

Abstract: The present invention relates to a method for transmitting an uplink reference signal in a multi-node system and a terminal using same. The method comprises the steps of: receiving a synchronization signal from a node; receiving parameters for a virtual cell identifier (ID) from the node; generating an uplink demodulation reference signal (DM-RS) using the parameters for the virtual cell ID; and transmitting the generated uplink DM-RS to the node, wherein a physical cell ID is a cell ID obtained from the synchronization signal, and the parameters for the virtual cell ID are parameters used for generating the uplink DM-RS in the replacement of the physical cell ID.

Abstract: A method and an apparatus for transmitting data in a wireless communication system are provided. A base station transmits to a terminal a physical downlink control channel (PDCCH) through a macro node, and transmits a physical downlink shared channel (PDSCH) through at least one radio remote head (RRH) having a cell identity (ID) that is identical to the macro node, so as not to overlap in with the PDCCH in a time domain. A time gap can be set between a last orthogonal frequency division multiplexing (OFDM) symbol to which the PDCCH is allocated and a first OFDM symbol to which the PDSCH is allocated.

Abstract: There are provided a method of user equipment searching for control information and an apparatus using the same. The method includes receiving information about the position of an Enhanced-Physical Control Format Indication Channel (E-PCFICH) from a base station, receiving an E-PCFICH based on the information about the position of the E-PCFICH, obtaining information about the frequency band of an Enhanced Physical Downlink Control Channel (E-PDCCH) region through the E-PCFICH, and searching the E-PDCCH region for an E-PDCCH for the user equipment, wherein the E-PCFICH is transmitted in an OFDM symbol between a Physical Downlink Control Channel (PDCCH), transmitted in the first N (N is one of natural numbers 1 to 4) Orthogonal Frequency Division Multiplexing (OFDM) symbols of a subframe in the time domain, and the E-PDCCH region.

Abstract: A method performed by a base station (BS) is provided for receiving aperiodic channel state information (CSI). The BS transmits a CSI request field which is set to trigger a CSI report to a user equipment (UE), and receives CSI through a physical uplink shared channel (PUSCH) from the UE. The CSI request field has a value among a plurality of candidate values and the plurality of candidate values comprises a first value which triggers an aperiodic CSI report for a first set of reference signals and a second value which triggers an aperiodic CSI report for a second set of reference signals. The first set and the second set of reference signals are configured by a higher layer signal.

Abstract: An interference removal method in a multi-node system is provided. A user equipment (UE) receives node information from a base station, a first signal from a first node, and a second signal from a second node. The first signal and the second signal are used to remove an interference. The node information includes configuration information related to the first signal and the second signal. The configuration information includes information related to at least one of a number of antenna ports of the first node and the second node, a number of data streams, and a node identifier (ID). A pattern of the first signal or the second signal is determined according to at least one of the number of antenna ports of the first node and the second node, the number of data streams, and the node ID.

Abstract: A method of transmitting data in a wireless communication system is provided. The method includes generating duplicate data by using repetition coding, the duplicate data being the same as original data, shifting the phase of the duplicate data, and transmitting the original data and the phase-shifted duplicate data. The duplicate data is mapped to a modulation symbol having a different size or phase as that of the original data, thus to reduce the PAPR unlike the general repetition coding.