Notification method and apparatus for channel quality indicator and modulation and coding scheme

Patent metadata

Field	Value
Publication number	US-11764897-B2
Application number	US-202016922802-A
Country	US
Kind code	B2
Filing date	Jul 7, 2020
Priority date	Jun 8, 2013
Publication date	Sep 19, 2023
Grant date	Sep 19, 2023

Abstract

The present invention discloses a notification method for a CQI and a modulation and coding scheme. The method includes: learning, by a terminal, a first CQI index according to a first CQI table; sending the first CQI index to a base station; receiving, by the base station, the first CQI index sent by the terminal UE; determining a first MCS index according to the first CQI table, a first MCS table, and the received first CQI index; sending the determined first MCS index to the UE; receiving, by the terminal, the first MCS index sent by the base station; and determining a modulation order and a code block size according to the first MCS table and the received first MCS index; where the first CQI table includes entries in which modulation schemes are higher than 64QAM.

First claim

What is claimed is:

1. A communication method comprising:
determining a channel quality indicator (CQI) index according to an first CQI table; and
sending the CQI index to a base station;
wherein the first CQI table at least comprises the following mapping relationship among a CQI index, a modulation scheme and a spectrum efficiency:

Modulation
Spectrum

CQI index
scheme
efficiency

0
out of range

1
QPSK
0.1523

2
QPSK
0.3770

3
QPSK
0.8770

4
16QAM
1.4766

5
16QAM
1.9141

6
16QAM
2.4063

7
64QAM
2.7305

8
64QAM
3.3223

9
64QAM
3.9023

10
64QAM
4.5234

11
64QAM
5.1152

12
256QAM
 5.5547.

2. The method according to claim 1 , wherein,
a value range of a CQI index in the first CQI table is from 0 to 15, and is the same as a value range of a CQI index in a second CQI table;
an entry in the first CQI table at least comprises a CQI index, a modulation scheme and spectrum efficiency; and
an entry in the second CQI table at least comprises a CQI index, a modulation scheme and spectrum efficiency.

3. The method according to claim 2 , wherein the spectrum efficiency 5.5547 in an entry that is corresponding to CQI index 12 and 256 quadrature amplitude modulation (QAM) in the first CQI table is equal to a spectrum efficiency in an entry that is corresponding to CQI index 15 and 64QAM in the second CQI table.

4. The method according to claim 2 , wherein the first CQI table and the second CQI table meet one of the following relations:
values of the modulation scheme and the spectrum efficiency in entries corresponding to CQI indices 1, 2 and 3 in the first CQI table are the same as values of the modulation scheme and the spectrum efficiency in entries corresponding to CQI indices 1, 3 and 5 in the second CQI table respectively; or
values of the modulation scheme and the spectrum efficiency in entries corresponding to CQI indices 4, 5 and 6 in the first CQI table are the same as values of the modulation scheme and the spectrum efficiency in entries corresponding to CQI indices 7, 8 and 9 in the second CQI table respectively; or
values of the modulation scheme and the spectrum efficiency in entries corresponding to CQI indices 7, 8, 9, 10 and 11 in the first CQI table are the same as values of the modulation scheme and the spectrum efficiency in entries corresponding to CQI indices 10, 11, 12, 13 and 14 in the second CQI table respectively.

5. The method according to claim 1 , wherein a value range of a CQI index in the first CQI table is from 0 to 15, and the modulation schemes corresponding to CQI indexes 13, 14, and 15 in the first table are 256QAM.

6. The method according to claim 5 , wherein a spectral efficiency corresponding to the CQI index 15 in the first CQI table is 7.4063.

7. A communication method comprising:
determining a first modulation and coding scheme (MCS) index according to a channel quality indicator (CQI) index of a first CQI table, wherein the first MCS index indicates a first modulation scheme; and
sending the first MCS index to a terminal;
wherein the first CQI table at least comprises the following mapping relationship among a CQI index, a modulation scheme and a spectrum efficiency:

Modulation
Spectrum

CQI index
scheme
efficiency

0
out of range

1
QPSK
0.1523

2
QPSK
0.3770

3
QPSK
0.8770

4
16QAM
1.4766

5
16QAM
1.9141

6
16QAM
2.4063

7
64QAM
2.7305

8
64QAM
3.3223

9
64QAM
3.9023

10
64QAM
4.5234

11
64QAM
5.1152

12
256QAM
 5.5547.

8. The method according to claim 7 , wherein,
a value range of a CQI index in the first CQI table is from 0 to 15, and is the same as a value range of a CQI index in a second CQI table;
an entry in the first CQI table at least comprises a CQI index, a modulation scheme and spectrum efficiency; and
an entry in the second CQI

Assignees

• Huawei Tech Co Ltd

Inventors

• Xia Liang

Classifications

• H04L1/0016 Primary

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

• H04L1/0026 Primary

  Transmission of channel quality indication · CPC title

• H04L1/00 Primary

  Arrangements for detecting or preventing errors in the information received {(correcting synchronisation H04L7/00)} · CPC title

• H04L1/0003 Primary

  by switching between different modulation schemes · CPC title

• H04L1/0009

  by adapting the channel coding (H04L1/1812 takes precedence) · CPC title