Abstract:
A method for transmitting an aperiodic sounding reference signal (SRS) by a user equipment (UE) in a wireless communication system includes receiving, by the UE from a network, downlink control information (DCI) for downlink scheduling which includes a triggering request of the aperiodic SRS, detecting, by the UE, the triggering request of the aperiodic SRS, and transmitting, by the UE to the network, the aperiodic SRS on an uplink (UL) component carrier (CC) among a plurality of UL CCs based on the DCI for downlink scheduling, wherein if a carrier indicator field (CIF) is included in the DCI for downlink scheduling, the UL CC is indicated by the CIF.
Abstract:
A method for transmitting a demodulation reference signal (DM-RS), by a user equipment (UE), in a wireless communication system is discussed. The method includes receiving, by the UE from a base station, a cyclic shift field in downlink control information (DCI), wherein the cyclic shift field indicates first, second, and third cyclic shift values for first, second, and third layers respectively, generating, by the UE, first, second, and third DMRSs for the first, second, and third layers respectively, based on first, second, and third cyclic shifts respectively, wherein the first, second, and third cyclic shifts are determined based on the first, second, and third cyclic shift values respectively, and transmitting, by the UE to the base station, the first, second, and third DMRSs.
Abstract:
A method is provided for generating Acknowledgement/Negative Acknowledgement (ACK/NACK) information by a user equipment (UE) in a wireless communication system supporting carrier aggregation. The UE receives, from a base station (BS), a plurality of codewords through a plurality of downlink carriers. Each of the plurality of downlink carriers support one or more codewords according to a transmission mode. The transmission mode is independently configured per each of the plurality of downlink carriers. The UE determines a total number of ACK/NACK bits, and generates a sequence of the ACK/NACK bits according to the total number of the ACK/NACK bits. The UE determines the total number of ACK/NACK bits based on a total number of the plurality of downlink carriers and a type of each transmission mode independently configured per each of the plurality of downlink carriers.
Abstract:
Embodiments of the present invention are directed to a method and apparatus for transmitting and receiving a control signal (for example, PDCCH signal) in an asymmetric multicarrier environment. The method for transmitting a control signal for an asymmetric multicarrier in a wireless connection system according to one embodiment of the present invention comprises: determining the size of a carrier indicator field (CIF) indicating a downlink component carrier (DL CC) by which downlink data is transmitted, on the basis of a maximum value of the number of DL CCs and of the number of uplink component carriers (UL CCs) being managed in a base station; transmitting the CIF on a 1st DL CC to a terminal through a physical downlink control channel (PDCCH); and transmitting downlink data on a 2nd DL CC indicated by the CIF to the terminal through a physical downlink shared channel (PDSCH).
Abstract:
A method for disabling a sequence group hopping by a user equipment (UE) in a wireless communication system, the method includes receiving a cell-specific sequence group hopping parameter from a base station, wherein the cell-specific sequence group hopping parameter is used to enable the sequence group hopping for a plurality of UEs, including the UE, in a cell; receiving a UE-specific sequence group hopping parameter from the base station, wherein the UE-specific sequence group hopping parameter is used to disable the sequence group hopping for the UE; and disabling the sequence group hopping by the UE-specific sequence group hopping parameter.
Abstract:
The present invention relates to a wireless communication system. More particularly, the present invention relates to a method and to an apparatus for transmitting an SRS in a multi-antenna system. The method comprises the steps of: acquiring specific information for discriminating a first antenna group and a second antenna group from among a plurality of antennas, wherein said first antenna group includes one or more antennas which are set to a turned-on state to perform communication with a base station, and said second antenna group includes one or more other antennas which are set to a turned-off state; transmitting an SRS to the base station if a predetermined condition is satisfied, under the condition that the second antenna group is set to the turned-off state; and setting the second antenna group to a turned-off state after the transmission of the SRS.
Abstract:
A method is provided for generating Acknowledgement/Negative Acknowledgement (ACK/NACK) information at a user equipment in a wireless communication system. The user equipment receives a plurality of codewords corresponding to data blocks through a plurality of downlink carriers from a base station, wherein each of the plurality of downlink carriers carries one or more codewords. The user equipment generates the ACK/NACK information by concatenating ACK/NACK bits corresponding to the plurality of codewords. When a corresponding downlink carrier carries two or more codewords, the ACK/NACK bits corresponding to the two or more codewords associated with the corresponding downlink carrier are concatenated in accordance with an index order of a corresponding data block. The ACK/NACK bits concatenated in accordance with the index order of the corresponding data block associated with each of the downlink carriers are concatenated again in accordance with an index order of a corresponding downlink carrier.
Abstract:
A method and apparatus for transmitting a signal in a wireless communication system are provided. The method includes: generating R spatial streams each of which is generated on the basis of an information stream and a reference signal; generating N transmit streams on the basis of the R spatial streams and a precoding matrix (where R
Abstract:
A method is provided for transmitting control information from a terminal in a wireless communication system. Physical downlink shared channels (PDSCHs) are received on a primary component carrier and PDSCHs are received on a secondary component carrier. The primary component carrier and the secondary component carrier are configured for the terminal. A first acknowledgement (ACK)/negative acknowledgement (NACK) feedback is transmitted for the received PDSCHs on a first physical uplink control channel (PUCCH) resource corresponding to a first antenna port and a second ACK/NACK feedback is transmitted for the received PDSCHs on a second PUCCH resource corresponding to a second antenna port. The first antenna port and the second antenna port are configured for the terminal. The first ACK/NACK feedback and the second ACK/NACK feedback are identical.
Abstract:
A method and a relay node (RN) for demodulating a relay physical downlink control channel (R-PDCCH) in a wireless communication system are discussed. The method according to an embodiment includes demodulating the R-PDCCH based on cell-specific reference signals transmitted on at least one first antenna port or based on user equipment (UE)-specific reference signals transmitted on a second antenna port. A type of reference signals among the cell-specific reference signals or the UE-specific reference signals, which is being used to demodulate the R-PDCCH, is configured by a higher layer.