Abstract:
A method and apparatus for transmitting a Reference Signal (RS) during retransmission at a User Equipment (UE) in a multi-antenna wireless communication system are disclosed. The RS transmission method includes receiving an uplink grant from a Base Station (BS), initially transmitting data and an RS corresponding to each layer based on the uplink grant, receiving ACKnowledgment/Negative ACKnowledgment (ACK/NACK) information for the initially transmitted data, and retransmitting the RS corresponding to each layer and the data according to the ACK/NACK information. The retransmission includes initializing a cyclic shift value for the RS corresponding to each layer according to a cyclic shift field for RSs included in the uplink grant.
Abstract:
A method for transmitting channel status information (CSI) of downlink transmission via uplink in a wireless communication system includes transmitting a rank indicator (RI) and a precoder type indicator (PTI) at a first subframe, transmitting at a second subframe a first precoding matrix indicator (PMI) when the PTI has a first value and transmitting a second PMI and a wideband channel quality indicator (WB CQI) when the PTI has a second value, and transmitting at a third subframe a second PMI and a WB CQI when the PTI has a first value and transmitting a subband (SB) CQI and a second PMI when the PTI has a second value. A user equipment (UE) preferred precoding matrix is indicated by a combination of the first PMI and the second PMI. Subsampled codebooks of precoding codebooks of individual Rank-2, Rank-3 and Rank-4 are applied to the second PMI.
Abstract:
A method for transmitting channel status information (CSI) of downlink multi-carrier transmission includes generating the CSI including at least one of a rank indicator (RI), a first precoding matrix index (PMI), a second PMI and a channel quality indicator (CQI) for one or more downlink carriers, the CQI being calculated based on precoding information determined by a combination of the first and second PMIs, determining, when two or more CSIs collide with one another in one uplink subframe of one uplink carrier, a CSI to be transmitted on the basis of priority, and transmitting the determined CSI over a uplink channel. If a CSI including an RI or a wideband first PMI collides with a CSI including a wideband CQI or a subband CQI, the CSI including a wideband CQI or a subband CQI has low priority and is dropped.
Abstract:
A method of transmitting a signal to a base station at a user equipment (UE) in a multi-antenna wireless communication system, can include generating interleaver input vector sequences, wherein the interleaver input vector sequences comprise vectors having a predetermined bit size, mapping the interleaver input vector sequences to an interleaver matrix, generating an output bit sequence by reading the interleaver matrix column by column, and transmitting the output bit sequence to the base station, wherein the predetermined bit size is defined by a product of a modulation order Qpm and the number NL of transmission layers.
Abstract:
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for reporting CSI in a wireless communication system, the method comprising: a step for configuring a plurality of serving cells; and a step for reporting the CSI of only one serving cell in a corresponding subframe, wherein the step for reporting the CSI of only one serving cell comprises: excluding reporting the CSI of a lower priority when CSI reports of the plurality of serving cells in the corresponding subframe collide; and excluding reporting the CSI of serving cells other than the serving cell having the smallest index when the CSI reports of different serving cells having the same priority in the corresponding subframe collide.
Abstract:
A method for transmitting information data by using a Reed-Muller coding scheme in a wireless communication system is disclosed. The method includes configuring a number of resource elements for transmitting the information data; dividing the information data to first information data and second information data if a bit size O of the information data is equal to or larger than a predetermined number; applying RM coding on each of the first information data and the second information data; concatenating the coded first information data and the coded second information data, and transmitting the concatenated data by using the predetermined number of resource elements, wherein a minimum value Q′min for the number of resource elements is defined by a sum of a minimum value Q′min_1 for the number of resource elements corresponding to the first information data and a minimum value Q′min_2 for the number of resource elements corresponding to the second information data.
Abstract:
The present invention relates to a wireless communication system. The present invention relates to a method for transmitting ACK/NACK in a wireless communication system in which carrier aggregation is set, and an apparatus therefor. Specifically, the present invention relates to an ACK/NACK transmission method and an apparatus therefor, the method comprising the steps of: receiving information on a plurality of physical uplink control channel (PUCCH) resources via upper layer signaling; receiving a transmit power control (TPC) field on a secondary carrier through a physical downlink control channel (PDCCH); receiving data indicated by the PDCCH; and transmitting ACK/NACK for the data, wherein the ACK/NACK is transmitted using a PUCCH resource which is indicated by the value of the TPC field among the plurality of PUCCH resources.
Abstract:
The present invention relates to a wireless communication system. The present invention relates to a method for transmitting ACK/NACK in a wireless communication system in which carrier aggregation is set, and an apparatus therefor. Specifically, the present invention relates to an ACK/NACK transmission method and an apparatus therefor, the method comprising the steps of: receiving information on a plurality of physical uplink control channel (PUCCH) resources via upper layer signaling; receiving a transmit power control (TPC) field on a secondary carrier through a physical downlink control channel (PDCCH); receiving data indicated by the PDCCH; and transmitting ACK/NACK for the data, wherein the ACK/NACK is transmitted using a PUCCH resource which is indicated by the value of the TPC field among the plurality of PUCCH resources.
Abstract:
A method is presented for transmitting signals at a User Equipment (UE) in a multi-antenna wireless communication system. Acknowledgment (ACK)/negative ACK (NACK) information is received from a base station (BS). At least one transport block negatively acknowledged by the ACK/NACK information is retransmitted to the BS. An uplink grant for retransmitting the at least one transport block is not detected. If a number of the at least one transport block is not equal to a number of transport blocks indicated by a most recent uplink grant, cyclic shift values and orthogonal cover codes (OCCs) of a demodulation reference signal (DMRS) for the at least one transport block are configured based on a cyclic shift field included in the most recent uplink grant and a number of layers corresponding to the at least one transport block.
Abstract:
A method is provided for receiving uplink control information (UCI) in a wireless access system supporting a carrier aggregation. An evolved Node-B (eNB) transmits, to a user equipment (UE), two or more physical downlink shared channels (PDSCHs) via two or more downlink component carriers, respectively. The eNB receives, from the UE, the UCI for the two or more downlink component carriers. The UCI includes acknowledgement information and channel quality information (CQI) for each of the two or more downlink carriers. The UCI is performed by using a channel coding with respect to the UCI according to a payload size of the UCI when the UCI is transmitted by using a physical uplink control channel (PUCCH) format 3. The UCI is performed by using a rate matching with respect to the channel coded UCI for the PUCCH format 3.