System and Method for Transport Block Size Design for Multiple-Input, Multiple-Output (MIMO) in a Wireless Communications System

A method for transmitting information, the method comprising:

• processing a uplink transport channel to generate a transport block (TB) having a TB size, wherein the TB size is selected by:
• selecting a modulation and coding scheme index (ITBS) and a physical resource block index (NPRB), and
• selecting the TB size for the ITBS and the NPRB so that the number of code blocks in the TB size is one (1) or a multiple of a number of spatial layers N;
• mapping the transport block to the N spatial layers;
• and
• transmitting the N spatial layers to a receiver.

A communications device comprising:

• a transmitter to be coupled to at least one transmit antenna, the transmitter configured to transmit signals with the at least one transmit antenna;
• a transport channel processing unit coupled to a processor, the transport channel processing unit configured to provide transport channel processing to a transport block (TB) provided by the processor, wherein a TB size of the TB is selected by:
• selecting a modulation and coding scheme index (ITBS) and a physical resource block index (NPRB), and
• setting the TB size for the selected ITBS and NPRB so that the effective code rate at a user equipment (UE) does not exceed a specified threshold, wherein the effective code rate is defined as the number of downlink (DL) information bits including TB cyclic redundancy check (CRC) bits and code block CRC bits divided by the number of physical channel bits on Physical Downlink Shared Channel (PDSCH);
• and
• a physical channel processing unit coupled to the transmitter, the physical channel processing unit configured to provide physical channel processing to a plurality of transport blocks provided by the transport channel processing unit.

A communications device comprising:

• a transmitter to be coupled to at least one transmit antenna, the transmitter configured to transmit signals with the at least one transmit antenna;
• a transport channel processing unit coupled to a processor, the transport channel processing unit configured to provide transport channel processing to a transport block (TB) provided by the processor, wherein a TB size of the TB is selected by:
• selecting a modulation and coding scheme index (ITBS) and a physical resource block index (NPRB), and
• selecting the TB size for the ITBS and NPRB so that the number of code blocks in the TB size is one (1) or a multiple of a number of spatial layers N;
• a channel interleaver coupled to the transport channel processing unit, the channel interleaver configured to interleave modulation symbols of a plurality of transport blocks;
• and
• a physical channel processing unit coupled to the channel interleaver and to the transmitter, the physical channel processing unit configured to provide physical channel processing to the interleaved modulation symbols provided by the channel interleaver.

A method for transmitting a transmit block (TB) to a user equipment (UE) using three spatial layers, the method comprising:

• using a first table for allocating a TB size for a transmission if 1≦NPRB≦36 and ITBS=26, wherein the ITBS is a modulation and coding scheme index and NPRB is a physical resource block index;
• using a translation table for allocating a TB size for the transmission if 37≦NPRB≦NMAX and 0≦ITBS≦25, wherein NMAX is the maximum number of physical resource blocks that can be allocated;
• and
• using a second table for allocating a TB size for the transmission if 37≦NPRB≦NMAX and ITBS=26.

A method for transmitting a transmit block (TB) to a user equipment (UE) using four spatial layers, the method comprising:

• using a first table for allocating a TB size for a transmission if 1≦NPRB≦55 and ITBS=26, wherein the ITBS is a modulation and coding scheme index and NPRB is a physical resource block index;
• using a translation table for allocating a TB size for the transmission if 56≦NPRB≦NMAX and 0≦ITBS≦25, wherein NMAX is the maximum number of physical resource blocks that can be allocated;
• and
• using a second table for allocating a TB size for the transmission if 56≦NPRB≦NMAX and ITBS=26.