Wireless communication system enhancement link data transfer method and apparatus thereof
A method for transmitting Physical Uplink Shared Channel (PUSCH) performed by a User Equipment (UE) in a wireless communication system may include receive downlink control information (DCI) for uplink (UL) transmission scheduling; and performing codebook based PUSCH transmission based on precoding information included in the DCI.
1. A method for transmitting a codebook-based Physical Uplink Shared Channel (PUSCH) performed by a User Equipment (UE) in a wireless communication system, comprising:
receiving restriction information for a precoding matrix, usable in the PUSCH transmission in the codebook;
receiving downlink control information (DCI) for uplink (UL) transmission scheduling; and
performing the codebook based PUSCH transmission based on precoding information included in the DCI and the restriction information,
when the PUSCH is transmitted using four antenna ports, the codebook includes:
a first group including non-coherent precoding matrixes for selecting only one port for each layer, wherein each of the non-coherent precoding matrixes is a matrix including one vector having a non-zero value in each column,
a second group including partial-coherent precoding matrixes for selecting two ports in at least one layer, wherein each of the partial-coherent precoding matrixes is a matrix including two vectors having a non-zero value in at least one column, and
a third group including full-coherence precoding matrixes for selecting all ports for each of the layers, wherein each of the full-coherence precoding matrixes is a matrix including vectors having only non-zero values.
2. The method of claim 1 , wherein the codebook is a codebook based on a Cyclic Prefix Orthogonal Frequency Division Multiplexing (CP-OFDM) waveform.
3. The method of claim 1 , wherein the DCI includes Transmit Precoding Matrix Indicator (TPMI) which is information for an index of a precoding matrix selected for the PUSCH transmission as the precoding information.
4. The method of claim 3 , wherein the TPMI is joint-encoded with a Rank Indicator (RI) which is information for a layer used in the PUSCH transmission.
5. The method of claim 4 ,
wherein the TPMI is indicated for each Sounding Reference Signal (SRS) resource configured to the UE, and
wherein the RI is commonly indicated for the configured SRS resources.
6. The method of claim 4 , wherein the TPMI and the RI are commonly indicated for all SRS resources configured to the UE.
7. The method of claim 4 , wherein the TPMI and the RI are indicated for each SRS resource configured to the UE.
8. The method of claim 4 , wherein a size of a predefined DMRS (Demodulation RS) field in the DCI to determine a DMRS port is determined differently according to the RI joint-encoded with the TPMI.
9. The method of claim 4 , further comprising receiving restriction information for a number of layers usable in the PUSCH transmission.
10. The method of claim 9 , wherein a size of a field in which the TPMI and RI are joint-encoded is determined based on the restriction information for the number of layers.
11. The method of claim 1 , wherein the restriction information for the precoding matrix indicates the precoding matrix usable in the PUSCH transmission in the group or individual precoding matrix.
12. The method of claim 4 , wherein a size of a field in which the TPMI and RI are joint-encoded is determined based on the restriction information for the precoding matrix.
13. The method of claim 1 , wherein the restriction information for the precoding matrix is information relating to each of the first group, the second group, and the third group.
14. A User Equipment (UE) configured for transmitting a codebook-based Physical Uplink Shared Channel (PUSCH) in a wireless communication system, comprising:
a transceiver for transmitting and receiving a radio signal; and
a processor for controlling the transceiver,
wherein the processor is configured to perform:
receive restriction information transceiver precoding matrix usable in the PUSCH transmission in the codebook,
receive downlink control information (DCI) for uplink (UL) transmission scheduling; and
perform the codebook based PUSCH transmission based on precoding information included in the DCI and the restriction information,
when the PUSCH is transmitted using four antenna ports, the codebook includes:
a first group including non-coherent precoding matrixes for selecting only one port for each layer, wherein each of the non-coherent precoding matrixes is a matrix including one vector having a non-zero value in each column,
a second group including partial-coherent precoding matrixes for selecting two ports in at least one layer, wherein each of the partial-coherent precoding matrixes is a matrix including two vectors having a non-zero value in at least one column, and
a third group including full-coherence precoding matrixes for selecting all ports for each of the layers, wherein each of the full-coherence precoding matrixes is a matrix including vectors having only non-zero values.