Abstract:
The present invention relates to a wireless communication system and provides an efficient control information transmission method and apparatus for supporting a multiple antenna transmission technique. A method is provided for transmitting downlink hybrid automatic repeat request (HARQ) information related to an uplink multiple codeword transmission and includes receiving the uplink multiple codeword transmission, generating HARQ information related to each of the multiple codewords based on a result of decoding each of the multiple codewords, modulating the HARQ information, and transmitting the modulated HARQ information via one or more physical HARQ indicator channels (PHICHs).
Abstract:
A method for detecting control information in a wireless communication system is provided. The method includes checking a cyclic redundancy check (CRC) error by monitoring control channels, determining whether a value of an error check field is equal to a specific value, and, if the value of the error check field is equal to a specific value, detecting the control information on the control channel.
Abstract:
The present invention relates to a method and apparatus which transmit/receive at least one demodulation reference signal by using a CDM group and/or a transmission rank of a user device that have been used to transmit the at least one demodulation reference signal for the user device, an OCC that has been used to spread the demodulation reference signal, etc. Also, the present invention relates to a method and apparatus which change an antenna port for transmitting the demodulation reference signal by using NDI for a disabled transmission block.
Abstract:
A method of data transmission includes determining the number of layers, generating mapping symbols by mapping modulation symbols for a first codeword and modulation symbols for a second codeword to each layer, and transmitting the mapping symbols through a plurality of antennas. At least one of the first codeword and the second codeword is mapped to at least 3 layers and the number of layers is larger than 3.
Abstract:
A method for generating Acknowledgement/Negative Acknowledgement (ACK/NACK) information at a user equipment in a wireless communication system. The method according to one embodiment includes receiving a plurality of transport blocks through a plurality of downlink carriers from a base station. Each of the plurality of downlink carriers carries two or more transport blocks. The method according to the embodiment further includes generating the ACK/NACK information by concatenating ACK/NACK bits corresponding to the plurality of transport blocks. The ACK/NACK bits are concatenated using an index order of the downlink carriers and an index order of the two or more transport blocks associated with each of the downlink carriers. The index order of the downlink carriers is used firstly.
Abstract:
An apparatus for transmitting and receiving data in a wireless communication system method thereof are disclosed. In a terminal of a wireless communication system, the present invention includes receiving a physical downlink control channel (hereinafter abbreviated PDCCH), receiving a physical downlink shared channel (hereinafter abbreviated PDSCH), and demodulating the PDSCH by interpreting the PDCCH according to a type of a subframe including the PDCCH and the PDSCH.
Abstract:
A method for transmitting reference signals for eight or fewer antenna ports includes mapping a portion of common reference signals (CRSs) for four or fewer antenna ports into a downlink subframe including 1st slot and 2nd slot with a normal cyclic prefix configuration; mapping channel status information reference signals (CSI-RSs) for eight or fewer antenna ports into the downlink subframe according to a preset pattern; and transmitting the downlink subframe into which the CRSs and the CSI-RSs are mapped, wherein the preset pattern defines the CSI-RSs for eight or fewer antenna ports to be mapped onto two OFDM symbols of the data region in the downlink subframe, with the two OFDM symbols being spaced apart by one OFDM symbol, and wherein the portion of the CRSs for four or fewer antenna ports is limited to the CRSs for two or fewer antenna ports.
Abstract:
A method for transmitting, by a user equipment (UE), an aperiodic sounding reference signal (SRS) in a wireless communication system; and the UE are discussed. The method includes receiving a downlink control information (DCI) format, which schedules a physical uplink shared channel (PUSCH) and includes an SRS request for triggering transmission of an aperiodic SRS, from a base station (BS); detecting the SRS request; and transmitting, when the UE is not configured with a carrier indicator field (CIF), the aperiodic SRS to the BS on a first uplink (UL) component carrier (CC) in which the PUSCH is scheduled, or, when the UE is configured with the CIF, the aperiodic SRS to the BS on a second UL CC in which the PUSCH is scheduled with a value of the CIF.
Abstract:
A user equipment in wireless communication system is provided. The user equipment includes an antenna unit including a plurality of antennas, a control unit for grouping the plurality of antennas into a predetermined number of antenna groups and controlling separately transmission power of each of the predetermined number of antenna groups, and a transmitting unit, connected to the control unit, for transmitting at least one of data and control information to a base station via at least one of the predetermined number of antenna groups.
Abstract:
A method of data transmission includes determining the number of layers, generating mapping symbols by mapping modulation symbols for a first codeword and modulation symbols for a second codeword to each layer, and transmitting the mapping symbols through a plurality of antennas. At least one of the first codeword and the second codeword is mapped to at least 3 layers and the number of layers is larger than 3.