System and method for transport block size design for multiple-input, multiple-output (MIMO) in a wireless communications system

Patent metadata

Field	Value
Publication number	US-RE46810-E
Application number	US-201514856224-A
Country	US
Kind code	E1
Filing date	Sep 16, 2015
Priority date	Jun 2, 2009
Publication date	Apr 24, 2018
Grant date	Apr 24, 2018

Abstract

In one embodiment, a method for transmitting information includes processing a downlink transport channel to generate a transport block (TB) having a TB size. The TB size is selected by selecting a modulation and coding scheme index (I TBS ) and a physical resource block index (N PRB ). The TB size for the selected I TBS and N PRB is selected so that an effective code rate at an user equipment (UE) does not exceed a specified threshold. The effective code rate is defined as a number of downlink (DL) information bits including TB cyclic redundancy check (CRC) bits and code block CRC bits divided by a number of physical channel bits on Physical Downlink Shared Channel (PDSCH). The transport block is mapped to multiple spatial layers. The number of spatial layers N is greater than or equal to three. The multiple spatial layers are transmitted to the UE.

First claim

What is claimed is:

1. A method for transmitting information, the method comprising:
processing a downlink 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 (I TBS ) and a physical resource block index (N PRB ), and
setting the a transport block (TB) size for the selected I TBS and N PRB wherein an effective code rate at a user equipment (UE) does not exceed a specified threshold, wherein the effective code rate is defined as a number of downlink (DL) information bits including TB cyclic redundancy check (CRC) bits and code block CRC bits divided by a number of physical channel bits on a Physical Downlink Shared Channel (PDSCH);
mapping the transport block to multiple spatial layers, wherein the number of spatial layers N is greater than or equal to three; and
transmitting the multiple spatial layers to the UE.

2. The method of claim 1 , wherein setting the TB size comprises defining the TB size so that code block sizes with TB CRC bits and code block CRC bits attached are aligned with Quadratic Permutation Polynomial (QPP) sizes for turbo codes.

3. The method of claim 1 , wherein the TB size is identical to another entry in an one-layer TB size table or a two-layer TB size table.

4. The method of claim 1 , wherein the number of spatial layers N is equal to three, and wherein the setting the TB size for the selected I TBS and N PRB comprises:
selecting the TB size by a (I TBS ,3·N PRB ) entry of a one-layer TBS table if 1≤N PRB ≤36; and
selecting the TB size from a translation table if 37≤N PRB ≤N MAX , wherein N MAX is the maximum number of physical resource blocks that can be allocated.

5. The method of claim 4 , wherein the translation table comprises translations from a one-layer TB size to a three-layer TB size.

6. The method of claim 4 , wherein the translation table is obtained by:
obtaining a one-layer TB size (TBS_L1) by selecting a (I TBS ,N PRB ) entry from the one-layer TBS table and calculating 3×TBS_L1; and
obtaining a three-layer TB size (TBS_L3) by selecting the TB size in the one-layer table or a two-layer table that is most adjacent to a calculated 3×TBS_L1.

7. The method of claim 6 , wherein if the calculated 3×TBS_L1 is larger than all entries in the one-layer and two-layer table, the three-layer TB size is selected to be 3×TBS_L1 with adjustments for CRC bits and alignment with Quadratic Permutation Polynomial (QPP) sizes for turbo coding.

8. The method of claim 4 , wherein if N PRB ={38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72} and 0≤I TBS ≤25, the TB size is selected by a

(

I
TBS

,

3
·

N
PRB

2

)

entry in an equivalent 27×110 two-layer TBS table constructed by a one-layer to two-layer TB size translation table.

9. The method of claim 4 , further comprising receiving the transmitted multiple spatial layers at the UE, and using the one-layer TBS table, or the translation table to determine a transmitted size of the transport block.

10. The method of claim 4 , wherein the translation table is

TBS_L1
TBS_L3

1032
3112

1064
3240

1096
3240

1128
3368

1160
3496

1192
3624

1224
3624

1256
3752

1288
3880

1320
4008

1352
4008

1384
4136

1416
4264

1480
4392

1544
4584

1608
4776

1672
4968

1736
5160

1800
5352

1864
5544

1928
5736

1992
5992

2024
5992

2088
6200

2152
6456

2216
6712

2280
6712/6968

2344
6968

2408
7224

2472
7480

2536
7480/7736

2600
7736

2664
7992

2728
8248

2792
8248/8504

2856
8504

2984
8760/9144

3112
9144/9528

3240
9528/9912

3368
 9912/10296

3496
10296/10680

3624
1068

Assignees

• Futurewei Technologies Inc

Inventors

• Jin Ying
• Blankenship Yufei

Classifications

• H04L27/0008 Primary

  arrangements for allowing a transmitter or receiver to use more than one type of modulation (negotiating modulation type for two-way transmission paths H04L5/1453) · CPC title