Method of uplink transmission

1 . A method of wireless communication comprising:

receiving, by a wireless device from a network node, a rank indication or a first index associated with the rank indication, wherein the rank indication is used to determine G rank values, wherein G is a positive integer greater than or equal to 2;

determining, by the wireless device, G port groups corresponding to the G rank values, wherein each of the G rank values corresponds to a port group of the G port groups;

receiving, by the wireless device from the network node, a matrix indication or a second index associated with the matrix indication, wherein the matrix indication is used to determine a basic matrix, wherein a size of the basic matrix is equal to a number of antenna ports divided by G; and

determining, by the wireless device, a precoding matrix for a transmission according to at least one of the G rank values or the basic matrix.

2 . The method of claim 1 , wherein

a sum of the G rank values is equal to a quantity of layers or columns in the precoding matrix, or

a sum of a quantity of ports in G port groups corresponding to the G rank values is equal to a quantity of ports or rows in the precoding matrix.

3 . The method of claim 1 , wherein the determining the precoding matrix according to at least one of the G rank values or the basic matrix comprises:

(a) determining G sub-matrices of the precoding matrix for G port groups according to at least one of the G rank values or the basic matrix, wherein determining the G sub-matrices includes at least one of:

determining a sub-matrix for a port group according to a rank value number of columns of the basic matrix;

determining a sub-matrix for a port group according to a first rank value quantity of columns of the basic matrix;

determining a sub-matrix for a port group according to a quantity of ports in the port group, Pi, of the basic matrix;

determining a sub-matrix for a port group according to a quantity of rows of the basic matrix, wherein the quantity of rows is determined by a quantity of ports in the port group;

determining a sub-matrix for a port group according to a first quantity of rows of the basic matrix, wherein the quantity of rows is determined by a quantity of ports in the port group; or

determining a sub-matrix for a port group is empty or a zero matrix if a rank value of the port group is zero; and

(b) determining the precoding matrix according to the G sub-matrices.

4 . The method of claim 1 , further comprising:

receiving, from the network node, a pattern indication or a third index associated with the pattern indication, wherein the pattern indication is used to determine non-zero power (NZP) for a port or the NZP for an element in a sub-matrix of the precoding matrix for a port group.

5 . The method of claim 4 , wherein the pattern indication indicates at least one of the following ports, rows, or elements are NZP:

all of the ports, elements, or rows in the sub-matrix for the port group,

half of the ports, the elements, or the rows in the sub-matrix for the port group,

a quarter of the ports, the elements, or the rows in the sub-matrix for the port group,

a first half or a second half of the ports, the elements, or the rows in the sub-matrix for the port group,

an even index or an odd index of the ports, the elements, or the rows in the sub-matrix for the port group, or

a first, a second, a third, or a fourth quarter of the ports, the elements, or the rows in the sub-matrix for the port group.

6 . The method of claim 4 , wherein:

the pattern indication is used for a first layer or a first column in a matrix,

the pattern indication is used for a layer or a column other than the first layer or the first column in a matrix, or

a hopped pattern is used for the layer or the column other than the first layer or the first column in a matrix.

7 . A method of wireless communication comprising:

transmitting, by a network node to a wireless device, a rank indication or a first index associated with the rank indication, wherein the rank indication is used to determine G rank values, wherein G is a positive integer greater than or equal to 2, and wherein each of the G rank values corresponds to a port group of G port groups; and

transmitting, by the network node to the wireless device, a matrix indication or a second index associated with the matrix indication, wherein the matrix indication is used to determine a basic matrix, wherein a size of the basic matrix is equal to a number of antenna ports divided by G, and wherein the transmitting the rank indication or the first index associated with the rank indication and the transmitting the matrix indication or the second index associated with the matrix indication enable the wireless device to determine a precoding matrix for a transmission of data.

8 . The method of claim 7 , wherein

a sum of the G rank values is equal to a quantity of layers or columns in the precoding matrix, or

a sum of a quantity of ports in G port groups corresponding to the G rank values is equal to a quantity of ports or rows in the precoding matrix.

9 . The method of claim 7 , wherein the precoding matrix is determined according to at least one of the G rank values or the basic matrix by:

(a) determining G sub-matrices for G port groups according to at least one of the G rank values or the basic matrix, wherein determining the G sub-matrices includes at least one of:

determining a sub-matrix for a port group according to a rank value number of columns of the basic matrix;

determining a sub-matrix for a port group according to a first rank value quantity of columns of the basic matrix;

determining a sub-matrix for a port group according to a quantity of ports in the port group, Pi, of the basic matrix;

determining a sub-matrix for a port group according to a quantity of rows of the basic matrix, wherein the quantity of rows is determined by a quantity of ports in the port group;

determining a sub-matrix for a port group according to a first quantity of rows of the basic matrix, wherein the quantity of rows is determined by a quantity of ports in the port group; or

determining a sub-matrix for a port group is empty or a zero matrix if a rank value of the port group is zero; and

(b) determining the precoding matrix according to the G sub-matrices.

10 . The method of claim 7 , further comprising:

transmitting, to the wireless device, a pattern indication or a third index associated with the pattern indication, wherein the pattern indication is used to determine non-zero power (NZP) for a port or an element in a sub-matrix of the precoding matrix for a port group.

11 . The method of claim 10 , wherein the pattern indication indicates at least one of the following ports rows, or elements are NZP:

all of the ports, elements, or rows in the sub-matrix for the port group,

half of the ports, the elements, or the rows in the sub-matrix for the port group,

a quarter of the ports, the elements, or the rows in the sub-matrix for the port group,

a first half or a second half of the ports, the elements, or the rows in the sub-matrix for the port group,

an even index or an odd index of the ports, the elements, or the rows in the sub-matrix for the port group, or

a first, a second, a third, or a fourth quarter of the ports, the elements, or the rows in the sub-matrix for the port group.

12 . The method of claim 11 , wherein:

the pattern indication is used for a first layer or a first column in a matrix,

the pattern indication is used for a layer or a column other than the first layer or the first column in a matrix, or

a hopped pattern is used for the layer or the column other than the first layer or the first column in a matrix.

13 . An apparatus for wireless communication comprising at least one processor and a memory storing instructions, execution of which by the processor causes the apparatus to:

receive a rank indication or a first index associated with the rank indication, wherein the rank indication is used to determine G rank values, wherein G is a positive integer greater than or equal to 2;

determine G port groups corresponding to the G rank values, wherein each of the G rank values corresponds to a port group of the G port groups;

receive a matrix indication or a second index associated with the matrix indication, wherein the matrix indication is used to determine a basic matrix, and wherein a size of the basic matrix is equal to a number of antenna ports divided by G; and

determine a precoding matrix for a transmission according to at least one of the G rank values or the basic matrix.

14 . The apparatus of claim 13 , wherein

a sum of the G rank values is equal to a quantity of layers or columns in the precoding matrix, or

a sum of a quantity of ports in G port groups corresponding to the G rank values is equal to a quantity of ports or rows in the precoding matrix.

15 . The apparatus of claim 13 , wherein the determining the precoding matrix according to at least one of the G rank values or the basic matrix comprises:

(a) determining G sub-matrices of the precoding matrix for G port groups according to at least one of the G rank values or the basic matrix, wherein determining the G sub-matrices includes at least one of:

determining a sub-matrix for a port group according to a rank value number of columns of the basic matrix;

determining a sub-matrix for a port group according to a first rank value quantity of columns of the basic matrix;

determining a sub-matrix for a port group according to a quantity of ports in the port group, Pi, of the basic matrix;

determining a sub-matrix for a port group according to a quantity of rows of the basic matrix, wherein the quantity of rows is determined by a quantity of ports in the port group;

determining a sub-matrix for a port group according to a first quantity of rows of the basic matrix, wherein the quantity of rows is determined by a quantity of ports in the port group; or

determining a sub-matrix for a port group is empty or a zero matrix if a rank value of the port group is zero; and

(b) determining the precoding matrix according to the G sub-matrices.

16 . The apparatus of claim 13 , further caused to:

receive a pattern indication or a third index associated with the pattern indication, wherein the pattern indication is used to determine non-zero power (NZP) for a port or the NZP for an element in a sub-matrix for a port group.

17 . An apparatus for wireless communication comprising at least one processor and a memory storing instructions, execution of which by the at least one processor causes the apparatus to:

transmit a rank indication or a first index associated with the rank indication, wherein the rank indication is used to determine G rank values, wherein G is a positive integer greater than or equal to 2, and wherein each of the G rank values corresponds to a port group of G port groups; and

transmit a matrix indication or a second index associated with the matrix indication, wherein the matrix indication is used to determine a basic matrix, wherein a size of the basic matrix is equal to a number of antenna ports divided by G, and wherein transmitting the rank indication or the first index associated with the rank indication and transmitting the matrix indication or the second index associated with the matrix indication enable a wireless device to determine a precoding matrix for a transmission of data.

18 . The apparatus of claim 17 , wherein

a sum of the G rank values is equal to a quantity of layers or columns in the precoding matrix, or

a sum of a quantity of ports in G port groups corresponding to the G rank values is equal to a quantity of ports or rows in the precoding matrix.

19 . The apparatus of claim 17 , wherein the precoding matrix is determined according to at least one of the G rank values or the basic matrix by:

(a) determining G sub-matrices for G port groups according to at least one of the G rank values or the basic matrix, wherein determining the G sub-matrices includes at least one of:

determining a sub-matrix for a port group according to a rank value number of columns of the basic matrix;

determining a sub-matrix for a port group according to a first rank value quantity of columns of the basic matrix;

determining a sub-matrix for a port group according to a quantity of ports in the port group, Pi, of the basic matrix;

determining a sub-matrix for a port group according to a quantity of rows of the basic matrix, wherein the quantity of rows is determined by a quantity of ports in the port group;

determining a sub-matrix for a port group according to a first quantity of rows of the basic matrix, wherein the quantity of rows is determined by a quantity of ports in the port group; or

determining a sub-matrix for a port group is empty or a zero matrix if a rank value of the port group is zero; and

(b) determining the precoding matrix according to the G sub-matrices.

20 . The apparatus of claim 17 , further caused to:

transmit a pattern indication or a third index associated with the pattern indication, wherein the pattern indication is used to determine non-zero power (NZP) for a port or an element in a sub-matrix of the precoding matrix for a port group.