Identifying modulation and coding schemes and channel quality indicators

Patent metadata

Field	Value
Publication number	US-9407417-B2
Application number	US-201314140098-A
Country	US
Kind code	B2
Filing date	Dec 24, 2013
Priority date	Jan 9, 2013
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

Methods, systems, and devices are described for wireless communications. The use of at least two channel quality indicator (CQI) tables is supported. One of the at least two CQI table is identified. The identified CQI table is used to generate a CQI value for a wireless channel. In addition, the use of at least two modulation and coding scheme (MCS) tables is supported. A transmission is received via a wireless channel. One of the at least two MCS tables is identified to use for the received transmission. Further, a transport block size (TBS) table is identified that is mapped from the identified MCS table. The identified TBS table is used to determine a size of the received transmission.

First claim

What is claimed is:

1. A method for wireless communications, comprising:
receiving a transmission via a wireless channel;
identifying a format of control channel used to transmit the received transmission; and
identifying one of at least two supported modulation and coding scheme (MCS) tables to use for the received transmission based at least in part on the identified format of control channel.

2. The method of claim 1 , further comprising:
using the identified MCS table to determine an MCS to use for the received transmission.

3. The method of claim 1 , wherein a first transport block size (TBS) table is mapped from a first MCS table and a second TBS table is mapped from a second MCS table, the second TBS table comprising at least one TBS that is greater than a maximum TBS in the first TBS table.

4. The method of claim 3 , further comprising:
identifying a TBS table mapped from the identified MCS table;
using the identified TBS table to determine a size of the received transmission.

5. The method of claim 1 , further comprising:
using the identified MCS table to determine an MCS to use for an uplink transmission.

6. The method of claim 1 , wherein a first number of bits is used to represent a first MCS based on a first MCS table, and a second number of bits is used to represent a second MCS based on a second MCS table.

7. The method of claim 6 , wherein the first number of bits is the same as the second number of bits.

8. The method of claim 1 , wherein the identifying one of the at least two MCS tables comprises:
dynamically selecting the MCS table to use for the received transmission.

9. The method of claim 1 , wherein identifying one of the at least two MCS tables comprises:
selecting the MCS table to use for the received transmission according to a predefined configuration setting.

10. An apparatus for wireless communications, comprising:
a processor;
a memory in electronic communication with the processor; and
instructions stored in the memory, the instructions being executable by the processor to:
receive a transmission via a wireless channel;
identify a format of control channel used to transmit the received transmission; and
identify one of at least two supported modulation and coding scheme (MCS) tables to use for the received transmission based at least in part on the identified format of control channel.

11. The apparatus of claim 10 , wherein the instructions are executable by the processor to:
use the identified MCS table to determine an MCS to use for the received transmission.

12. The apparatus of claim 10 , wherein a first transport block size (TBS) table is mapped from a first MCS table and a second TBS table is mapped from a second MCS table, the second TBS table comprising at least one TBS that is greater than a maximum TBS in the first TBS table.

13. The apparatus of claim 12 , wherein the instructions are executable by the processor to:
identify a TBS table mapped from the identified MCS table;
use the identified TBS table to determine a size of the received transmission.

14. The apparatus of claim 10 , wherein the instructions are executable by the processor to:
use the identified MCS table to determine an MCS to use for an uplink transmission.

15. The apparatus of claim 10 , wherein a first number of bits is used to represent a first MCS based on a first MCS table, and a second number of bits is used to represent a second MCS based on a second MCS table.

16. The apparatus of claim 15 , wherein the first number of bits is the same as the second number of bits.

17. The apparatus of claim 10 , wherein the instructions to identify one of the at least two MCS tables are executable by the processor to:
dynamically select the MCS table to use for the received transmission.

18. The apparatus of claim 10 , wherein the instructions to identify one of the at least two MCS tables are executable by the processor to:
select the MCS table to use for the received transmission according to a predefined configuration setting.

19. An apparatus for wireless communications, comprising:
means for receiving a transmission via a wireless channel;
means for identifying a format of control channel used to transmit the received transmission; and
means for identifying one of at least two supported modulation and coding scheme (MCS) tables to use for the received transmission based at least in part on the identified format of control channel.

20. The apparatus of claim 19 , further comprising:
means for using the identified MCS table to determine an MCS to use for the received transmission.

21. The apparatus of claim 19 , wherein a first number of bits is used to represent a first MCS based on a first MCS table, and a second number of bits is used to represent a second MCS based on a second MCS table.

22. The apparatus of claim 21 , wherein the first number of bits is the same as the second number of bits.

23. A non-transitory computer-readable medium storing instructions executable by a processor to:
receive a transmission via a wireless channel;
identify a format of control channel used to transmit the received transmission; and
identify one of at least two supported modulation and coding scheme (MCS) tables to use for the received transmission based at least in part on the identified format of control channel.

24. A method for wireless communications, comprising:
identifying one of at least two supported modulation and coding scheme (MCS) tables, wherein the identification of one of the at least two MCS tables is based at least in part on a downlink control information (DCI) format; and
using the identified MCS table to identify an MCS for a transmission.

25. The method of claim 24 , wherein the using the identified MCS table to identify the MCS comprises:
selecting the MCS for a downlink transmission.

26. The method of claim 24 , wherein the using the identified MCS table to identify the MCS comprises:
selecting the MCS for an uplink transmission.

27. The method of claim 24 , wherein a first number of bits is used to represent a first MCS based on a first MCS table, and a second number of bits is used to represent a second MCS based on a second MCS table.

28. The method of claim 27 , wherein the first number of bits is the same as the second number of bits.

29. The method of claim 24 , further comprising:
associating a single MCS table with each assignment of a physical downlink shared channel (PDSCH).

30. The method of claim 24 , further comprising:
identifying at least two codewords to be transmitted via a single physical downlink shared channel (PDSCH); and
using the identified one of the at least two MCS tables for downlink transmissions of the at least two codewords.

31. The method of claim 24 , further comprising:
identifying a format of control channel to be used for the transmission; and
identifying one of the at least two MCS tables to use for the transmission based at least in part on the identified format of control channel.

32. The method of claim 24 , further comprising:
identifying a set of candidates for a control channel transmission; and
identifying one of the at least two MCS tables to use for the control channel transmission based at least in part on the identified set of candidates.

Assignees

• Qualcomm Inc

Inventors

• Chen Wanshi
• Gaal Peter
• Luo Tao
• Xu Hao

Classifications

• H04W72/542

  using measured or perceived quality · CPC title

• H04L1/003

  Adaptive formatting arrangements particular to signalling, e.g. variable amount of bits · CPC title

• H04L1/0003 Primary

  by switching between different modulation schemes · CPC title

• H04L1/0016

  involving special memory structures, e.g. look-up tables · CPC title

• H04L1/0025

  Transmission of mode-switching indication · CPC title