Abstract:
The present invention provides a method and apparatus for performing contention-based uplink transmission in a wireless communication system. A terminal transmits a contention-based uplink signal to a base station. The base station detects a contention-based uplink signal that is transmitted from at least one terminal, and determines whether there exists a terminal corresponding to the detected contention-based uplink signal. The terminal receives an uplink (UL) grant from the base station. The terminal switches from a dormant station into an active state, based on the uplink grant. Here, the dormant state is a state where radio resource control connection is formed between the base station and the terminal but data is not actually transmitted, and the active state is a state where data transmission is actually performed.
Abstract:
The present invention relates to a method for transmitting control information regarding uplink multiple antenna transmission may comprise the steps of: transmitting DCI for scheduling the uplink transmission of a plurality of data blocks through a PDCCH; receiving the plurality of data blocks scheduled by the DCI; transmitting information which indicates positive acknowledgement or negative acknowledgement to each of the plurality of received data blocks through the PHICH; and receiving retransmission for the negative acknowledged data blocks. When the number of the negative-acknowledged data blocks is not equal to the number data blocks indicated in the PDCCH, a pre-coding matrix, which is for the number of transmission layers equivalent to that of layers corresponding to the negative-acknowledged data blocks, may be used for retransmission.
Abstract:
Disclosed is a method for transmitting control information on uplink multi-antenna transmission from a base station and the method includes: transmitting DCI that schedules uplink transmission of a first data block and a second data block through a PDCCH; receiving the first and second data blocks scheduled by the DCI; transmitting information indicating ACK or NACK for the received first and second data blocks, respectively, by using a first PHICH for the first data block and a second PHICH resource for the second data block; receiving a retransmission for a negative-acknowledged data block; and transmitting information indicating ACK or NACK of the retransmission of the negative-acknowledged data block by using the first PHICH resource when the number of negative-acknowledged data blocks is not identical to the number of data blocks that the PDCCH indicates.
Abstract:
A method for transmitting a channel status information reference signals (CSI-RSs) for a maximum of eight antenna ports includes mapping the CSI-RSs for a maximum of eight antenna ports onto a data region of a downlink subframe having a normal cyclic prefix (CP) configuration according to a predetermined pattern; and transmitting the downlink subframe to which the CSI-RSs mapped, wherein the predetermined pattern defines the CSI-RSs to be mapped onto two OFDM symbols of the data region in the downlink subframe and mapped to at least one of four subcarrier positions in each of the two OFDM symbols, and wherein the four subcarrier positions defined by the predetermined pattern may be two consecutive subcarrier positions and two other consecutive subcarrier positions spaced apart by four subcarriers.
Abstract:
The present invention relates to a method for sending a data signal from a transmitter to a receiver in a multiple antenna wireless communication system. In particular, the method comprises: sending information about the number of transmission antennas of the transmitter to the receiver; receiving from the receiver information about the number of effective communication links of the transmitter and the receiver; determining a precoding matrix based on the information about the number of effective communication links; and receiving from the receiver the data signal using the precoding matrix, wherein transmission antennas of the transmitter and receiving antennas of the receiver respectively form effective communication links independent of each other.
Abstract:
The present invention relates to a method wherein a terminal transmits control information in a wireless communication system, and comprises the steps of: receiving a first reference signal, which is transmitted according to a first transmission period, from a base station; receiving a second reference signal, which is transmitted according to a second transmission period, from the base station; performing channel estimation using at least the first or second reference signals; and reporting control information, which includes at least channel information on the first reference signal or channel information on the second reference signal, to the base station according to the channel estimation result, wherein the control information may be configured such that the channel information on the first reference signal and the channel information on the second reference signal are multiplexed or such that any one of same is dropped.
Abstract:
Disclosed is a method for transmitting a sounding reference signal from a mobile terminal that includes plural antennas. Different plural sounding reference signal sequences that have mutual orthogonality are mapped to each antenna, and then transmitted. Or, the same sounding reference signal sequence is mapped to the plural antennas after precoding or cyclic delay diversity processing, and then transmitted.
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
Abstract:
A method of transmitting a codebook index in a wireless communication system includes receiving a feedback index regarding an entity selected from a plurality of entities belonging to a feedback codebook, selecting a precoder from a precoding codebook using the feedback index, the precoding codebook comprising a plurality of precoders and transmitting a precoder index of the selected precoder. Flexibility can be given to codebook designs, and overhead due to the feedback of codebook indices can be reduced.
Abstract:
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method for transmitting control signal via a PUCCH in a wireless communication system, and to an apparatus for the method, wherein the method comprises the following steps: joint-coding a plurality of pieces of control information to obtain a single codeword; obtaining a first modulation symbol sequence from the single codeword; obtaining, from the first modulation symbol sequence, a plurality of second modulation symbol sequences corresponding to each slot in the PUCCH; cyclically shifting the plurality of second modulation symbol sequences in a time domain to obtain a plurality of third modulation symbol sequences; performing a discrete Fourier transform (DFT) precoding process on the plurality of third modulation symbol sequences to obtain a plurality of complex symbol sequences in a frequency domain; and transmitting the plurality of complex symbol sequences via the PUCCH.