System and method for multiple input, multiple output layer mapping

1. A method for mapping modulation symbols to multiple input, multiple output (MIMO) layers, the method comprising:

receiving a first set of modulation symbols corresponding to a first transport block (TB), wherein the first TB comprises a plurality of code blocks;

partitioning the first set of modulation symbols into M 1 parts, where M 1 is a positive integer value greater than one, wherein all modulation symbols of at least one code block belong to a single part;

assigning an i-th part to an i-th MIMO layer, i=1, . . . , M 1 ; and

transmitting the modulation symbols mapped onto M 1 MIMO layers, wherein a resulting mapping of the first TB to M 1 MIMO layers comprises

x (a) ( i )= d (1) ( i )

x (b) ( i )= d (l) ( M symb layer +i )′

where x (j) (i) is an i-th modulation symbol on a j-th MIMO layer, a is a first index of a MIMO layer, b is a second index of a MIMO layer, a≠b, d (j) (i) is an i-th modulation symbols of a j-th TB, i=0, 1, . . . , M symb layer −1, M symb layer is a number of modulation symbols per layer, and d (1) refers to the first TB.

2. The method of claim 1 , wherein each code block of the first TB is protected by code block-level cyclic redundancy check bits which are generated based on the code block.

3. The method of claim 1 , wherein the first TB is protected by TB-level cyclic redundancy check bits, which are generated based on an entirety of the first TB.

4. The method of claim 3 , wherein M 1 =2.

5. The method of claim 1 further comprising:

receiving a second set of modulation symbols corresponding to a second TB, wherein the second TB comprises an integer number of code blocks;

partitioning the second set of modulation symbols into M 2 parts, where M 2 is a positive integer;

assigning each of the M 2 parts to one of M 2 MIMO layers, wherein the M 2 MIMO layers for the second TB are different from the M 1 MIMO layers for the first TB; and

transmitting the modulation symbols mapped onto the M 2 layers.

6. The method of claim 5 , wherein M 2 =1.

7. The method of claim 5 , wherein M 2 =2.

8. The method of claim 5 , wherein the second TB is protected by TB-level cyclic redundancy check bits, which are generated based on an entirety of the second TB.

9. The method of claim 1 , wherein the transmission is an uplink transmission.

10. The method of claim 1 , wherein the transmission is a downlink transmission.

11. A method for mapping modulation symbols to multiple input, multiple output (MIMO) layers, the method comprising:

receiving a first set of modulation symbols corresponding to a first transport block (TB), wherein the first TB comprises a plurality of code blocks;

partitioning the first set of modulation symbols into M 1 parts, where M 1 is a positive integer value greater than one, wherein all modulation symbols of at least one code block belong to a single part;

assigning an i-th part to an i-th MIMO layer, i=1, . . . , M 1 ;

transmitting the modulation symbols mapped onto M 1 MIMO layers;

receiving a second set of modulation symbols corresponding to a second TB, wherein the second TB comprises an integer number of code blocks;

partitioning the second set of modulation symbols into M 2 parts, where M 2 is a positive integer;

assigning each of the M 2 parts to one of M 2 MIMO layers, wherein the M 2 MIMO layers for the second TB are different from the M 1 MIMO layers for the first TB; and

transmitting the modulation symbols mapped onto the M 2 layers, wherein a resulting mapping of the second TB to M 2 MIMO layers comprises

x (c) ( i )= d (0) ( i ),

where x (j) (i) is an i-th modulation symbol on a j-th MIMO layer, c is an index of a MIMO layer, d (j) (i) is an i-th modulation symbols of a j-th TB, i=0, 1, . . . , M symb layer −1, M symb layer is a number of modulation symbols per layer, and d (0) refers to the second TB.

12. A method for mapping modulation symbols to multiple input, multiple output (MIMO) layers, the method comprising:

receiving a first set of modulation symbols corresponding to a first transport block (TB), wherein the first TB comprises a plurality of code blocks;

partitioning the first set of modulation symbols into M 1 parts, where M 1 is a positive integer value greater than one, wherein all modulation symbols of at least one code block belong to a single part;

assigning an i-th part to an i-th MIMO layer, i=1, M 1 ;

transmitting the modulation symbols mapped onto M 1 MIMO layers;

receiving a second set of modulation symbols corresponding to a second TB, wherein the second TB comprises an integer number of code blocks;

partitioning the second set of modulation symbols into M 2 parts, where M 2 is a positive integer;

assigning each of the M 2 parts to one of M 2 MIMO layers, wherein the M 2 MIMO layers for the second TB are different from the M 1 MIMO layers for the first TB; and

transmitting the modulation symbols mapped onto the M 2 layers, wherein a resulting mapping of the second TB to M 2 MIMO layers comprises

x (c) ( i )= d (0) ( i )

x (d) ( i )= d (0) ( M symb layer +i )′

where x (j) (i) is an i-th modulation symbol on a j-th MIMO layer, c is an index of a MIMO layer, d is another index of a MIMO layer, c≠d, d (j) (i) is an i-th modulation symbols of a j-th TB, i=0, 1, . . . , M symb layer is a number of modulation symbols per layer, and d (0) refers to the second TB.

13. A method for transmitting a transport block on M layers, where M is a positive integer value greater than one, the method comprising:

receiving the transport block, wherein the transport block comprises N code blocks, where N is a positive integer value greater than or equal to one;

mapping the N code blocks onto the M layers, wherein at least one complete code block is mapped onto a single layer, and wherein modulation symbols of the N code blocks are substantially distributed over the M layers; and

transmitting the N code blocks mapped onto the M layers,

wherein mapping the N code blocks onto the M layers comprises:

mapping symbols onto a first layer in accordance with

x (a) ( i )= d (l) ( i )

x (b) ( i )= d (1) ( M symb layer +i )′

where x (j) (i) is an i-th modulation symbol on a j-th MIMO layer, a is a first index of a MIMO layer, b is a second index of a MIMO layer, a≠b, d (j) (i) is an i-th modulation symbol of a j-th TB, i=0, 1, . . . , M symb layer −1, M symb layer is a number of modulation symbols per layer, and d (1) refers to the transport block.

14. The method of claim 13 , wherein the mapping is performed in accordance with a table of code block to layer mappings.

15. The method of claim 13 , wherein the mapping is performed in accordance with a mapping algorithm.

16. The method of claim 13 , wherein mapping the N code blocks onto the M layers comprises:

mapping each respective code block entirely onto a single one of the M layers such that all symbols of a given code block are communicated on the same layer.

17. The method of claim 13 , wherein M layers comprise multiple input, multiple output (MIMO) layers.

18. An apparatus comprising:

a processor; and

a computer readable storage medium storing programming for execution by the processor, the programming including instructions to:

receive a transport block comprising N code blocks, where N is a positive integer value greater than or equal to one;

map the N code blocks onto M layers, where M is a positive integer value greater than one, wherein at least one complete code block is mapped onto a single layer, and wherein modulation symbols of the N code blocks are substantially distributed over the M layers; and

transmit the N code blocks mapped onto the M layers,

wherein mapping the N code blocks onto the M layers comprises:

mapping symbols onto a first layer in accordance with

x (a) ( i )= d (1) ( i )

x (b) ( i )= d (1) ( M symb layer +i )′

where x (j) (i) is an i-th modulation symbol on a j-th MIMO layer, a is a first index of a MIMO layer, b is a second index of a MIMO layer, a≠b, d (j) (i) is an i-th modulation symbol of a j-th TB, i=0, 1, . . . , M symb layer −1, M symb layer is a number of modulation symbols per layer, and d (1) refers to the transport block.

19. The apparatus of claim 18 , wherein the mapping is performed in accordance with a table of code block to layer mappings.

20. The apparatus of claim 18 , wherein the mapping is performed in accordance with a mapping algorithm.

21. The apparatus of claim 18 , wherein mapping the N code blocks onto the M layers comprises:

mapping each respective code block entirely onto a single one of the M layers such that all symbols of a given code block are communicated on the same layer.

22. The apparatus of claim 18 , wherein M layers comprise multiple input, multiple output (MIMO) layers.