Method and apparatus for multiple panel and/or multiple beam codebook based PUSCH transmissions
The present disclosure relates to method and apparatus for multiple panel and/or multiple beam codebook based PUSCH transmissions. The method includes receiving, at a User Equipment (UE), Downlink Control Information (DCI) including two or more sets of parameters; and performing codebook based Physical Uplink Shared Channel (PUSCH) transmission for transmitting the two or more codewords according to the two or more sets of parameters, respectively; wherein each of the two or more sets of parameters includes at least one of a Sounding Reference Signal Resource Indicator (SRI), a Transmitted Precoding Matrix Indicator (TPMI), a Modulation Coding Scheme (MCS), a New Data Indicator (NDI) and a Redundancy Version (RV).
1. A method of a user equipment, the method comprising:
receiving, at the user equipment, downlink control information comprising two sounding reference signal resource indicators and two transmitted precoding matrix indicators;
performing codebook based physical uplink shared channel transmission according to the two sounding references signal resource indicators and the two transmitted precoding matrix indicators; and
transmitting two or more sounding reference signal resources configured in two or more sounding reference signal resource sets, respectively, wherein the two or more sounding reference signal resources are used for the codebook based physical uplink shared channel transmission.
2. The method of claim 1 , further comprising performing codeword-to-layer mapping, wherein a rank number for a first codeword of two or more codewords is different from another rank number for a second codeword of the two or more codewords if two codewords are transmitted.
3. The method of claim 2 , wherein the first codeword is mapped to two layers and the second codeword is mapped to one layer if the rank number of the first codeword is indicated as two, and the another rank number of the second codeword is indicated as one if two codewords are transmitted.
4. The method of claim 2 , wherein the first codeword is mapped to three layers and the second codeword is mapped to one layer if the rank number of the first codeword is indicated as three, and the another rank number of the second codeword is indicated as one if two codewords are transmitted.
5. The method of claim 2 , wherein the first codeword is mapped to three layers and the second codeword is mapped to two layers if the rank number of the first codeword is indicated as three, and the another rank number of the second codeword is indicated as two if two codewords are transmitted.
6. The method of claim 2 , wherein the first codeword is mapped to one layer and the second codeword is mapped to four layers if the rank number of the first codeword is indicated as one, and the another rank number of the second codeword is indicated as four if two codewords are transmitted.
7. The method of claim 2 , wherein the first codeword is mapped to two layers and the second codeword is mapped to four layers if the rank number of the first codeword is indicated as two, and the another rank number of the second codeword is indicated as four if two codewords are transmitted.
8. The method of claim 2 , wherein the first codeword is mapped to four layers and the second codeword is mapped to three layers if the rank number of the first codeword is indicated as four, and the another rank number of the second codeword is indicated as three if two codewords are transmitted.
9. The method of claim 1 , further comprising:
generating a precoding matrix according to two or more sub-matrices respectively indicated by the two or more transmitted precoding matrix indicators; and
performing precoding in accordance with the precoding matrix.
10. The method of claim 9 , wherein a first sub-matrix of the two or more sub-matrices is arranged at a first position on a diagonal of the precoding matrix, wherein a second sub-matrix of the two or more sub-matrices is arranged at a second position on the diagonal of the precoding matrix, and wherein the first position is different from the second position.
11. The method of claim 1 , wherein the transmitted precoding matrix indicator is ignorable if only two antennas are used for the codebook based physical uplink shared channel transmission.
12. An apparatus comprising a user equipment, the apparatus further comprising:
a receiver that receives downlink control information comprising two sounding reference signal resource indicators and two transmitted precoding matrix indicators;
a processor that performs codebook based physical uplink shared channel transmission according to the two sounding references signal resource indicators and the two transmitted precoding matrix indicators; and
a transmitter, wherein the transmitter transmits two or more sounding reference signal resources configured in two or more sounding reference signal resource sets, respectively, wherein the two or more sounding reference signal resources are used for the codebook based physical uplink shared channel transmission.
13. The apparatus of claim 12 , wherein the processor performs codeword-to-layer mapping, wherein a rank number for a first codeword of two or more codewords is different from another rank number for a second codeword of the two or more codewords.
14. The apparatus of claim 13 , wherein the first codeword is mapped to two layers and the second codeword is mapped to one layer if the rank number of the first codeword is indicated as two, and the another rank number of the second codeword is indicated as one.
15. The apparatus of claim 13 , wherein the first codeword is mapped to three layers and the second codeword is mapped to one layer if the rank number of the first codeword is indicated as three, and the another rank number of the second codeword is indicated as one.
16. The apparatus of claim 13 , wherein the first codeword is mapped to three layers and the second codeword is mapped to two layers if the rank number of the first codeword is indicated as three, and the another rank number of the second codeword is indicated as two.