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

Patent metadata

Field	Value
Publication number	US-10250356-B2
Application number	US-201715837890-A
Country	US
Kind code	B2
Filing date	Dec 11, 2017
Priority date	Jun 8, 2013
Publication date	Apr 2, 2019
Grant date	Apr 2, 2019

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 notification method for a channel quality indicator (CQI) comprising:
acquiring a first CQI index according to an acquired first CQI table; and
sending the first CQI index to a base station,
wherein the first CQI table comprises:
multiple entries in which modulation schemes are higher than 64 quadrature amplitude modulation (QAM);
multiple entries in a second CQI table and in which modulation schemes are quadrature phase shift keying (QPSK); and
all entries that are in the second CQI table and in which modulation schemes are 16QAM;

wherein the second CQI table comprises 6 entries in which the modulation schemes are QPSK, the 6 entries are associated with CQI indices 1 to 6, respectively, and entries associated with CQI indices 3, 4, 5, and 6 in the second CQI table are entries in which code rates are highest in the 6 entries;
wherein a combination formed by the multiple entries in which the modulation schemes are QPSK in the first CQI table, is neither a combination of the entries associated with CQI indices 4, 5 and 6 in the second CQI table, nor a combination of the entries associated with CQI indices 3, 4, 5 and 6 in the second CQI table; and
wherein modulation schemes in entries in the second CQI table comprise only QPSK, 16QAM, and 64QAM, and a value range of a CQI index in the first CQI table is the same as a value range of a CQI index in the second CQI table.

2. The method according to claim 1 , wherein the multiple entries in which the modulation schemes are QPSK in the first CQI table, are multiple entries in the second CQI table and in which modulation schemes are QPSK;
wherein CQI indices associated with the multiple entries are at equal intervals.

3. The method according to claim 1 , wherein the first CQI table further comprises:
multiple entries in the second CQI table and in which a modulation scheme is 64QAM.

4. The method according to claim 3 , wherein the multiple entries in the second CQI table and in which the modulation schemes are 64QAM comprises:
multiple entries in the second CQI table and in which modulation schemes are 64QAM, and at least one entry, except an entry associated with a maximum CQI index, of all entries in which modulation schemes are 64QAM.

5. The method according to claim 1 , wherein a spectrum efficiency in an entry that is associated with a minimum CQI index and of the entries in which the modulation schemes are higher than 64QAM in the first CQI table, is equal to a spectrum efficiency in an entry that is associated with a maximum CQI index and of all entries in which modulation schemes are 64QAM in the second CQI table.

6. A notification method for a modulation and coding scheme (MCS) comprising:
receiving a first channel quality indicator (CQI) index sent by UE, wherein the first CQI index is determined by the UE according to an acquired first CQI table;
determining a first MCS index according to the acquired first CQI table, a first MCS table, and the received first CQI index, wherein the first MCS table comprises (a) multiple entries whose modulation schemes are higher than 64QAM and (b) multiple entries in a second MCS table whose modulation schemes are QPSK and 16QAM and the first CQI table comprises (a) multiple entries whose modulation schemes are higher than 64 quadrature amplitude modulation (QAM), (b) multiple entries in a second CQI table whose modulation schemes are quadrature phase shift keying (QPSK), and (c) all entries in the second CQI table whose modulation schemes are 16QAM; and
sending the determined first MCS index to the UE;
wherein the second CQI table comprises 6 entries in which the modulation schemes are QPSK, the 6 entries are associated with CQI indices 1 to 6, respectively, and entries associated with CQI indices 3, 4, 5, and 6 in the second CQI table are entries in which code rates are highest in the 6 entries;
wherein a combination formed by the multiple entries in which the modulation schemes are QPSK in the first CQI table, is neither a combination of the entries associated with CQI indices 4, 5 and 6 in the second CQI table, nor a combination of the entries associated with CQI indices 3, 4, 5 and 6 in the second CQI table;
wherein modulation schemes in entries in the second CQI table comprise only QPSK, 16QAM, and 64QAM, and a value range of a CQI index in the first CQI table is the same as a value range of a CQI index in the second CQI table;
wherein the second MCS table comprises 10 entries in which the modulation schemes are QPSK, the 10 entries corresponding to MCS indices 0-9 respectively, and wherein entries corresponding to MCS indices 5, 6, 7, 8 and 9 in the second MCS table are entries in which code rates are highest in the 10 entries;
wherein, a combination formed by the multiple entries in which the modulation scheme are QPSK in the first MCS table, is not a combination of the entries corresponding to MCS indices 5, 6, 7, 8 and 9 in the second MCS table;
wherein the multiple entries in which the modulation schemes are QPSK in the first MCS table, are entries whose MCS indices are at equal intervals in the second MCS table;
wherein modulation schemes in the second MCS table comprise only QPSK, 16QAM, and 64QAM, and a value range of an MCS index in the first MCS table is the same as a value range of an MCS index in the second MCS table.

7. The method according to claim 6 , wherein the multiple entries in which the modulation schemes are QPSK in the first CQI table, are multiple entries in the second CQI table and in which modulation schemes are QPSK;
wherein CQI indices associated with the multiple entries are at equal intervals.

8. The method according to claim 6 , wherein the first CQI table further comprises:
multiple entries in the second CQI table and in which modulation schemes are 64QAM.

9. The method according to claim 8 , wherein the multiple entries in the second CQI table and in which the modulation schemes are 64QAM comprises:
multiple entries in the second CQI table and in which modulation schemes are 64QAM, and at least one entry, except an entry associated with a maximum CQI index, of all entries in which modulation schemes are 64QAM.

10. The method according to claim 6 , wherein a spectrum efficiency and in an entry that is associated with a minimum CQI index and of the entries in which the modulation schemes are higher than 64QAM in the first CQI table is equal to a spectrum efficiency in an entry that is associated with a maximum CQI index and of all entries in which modulation schemes are 64QAM in the second CQI table.

11. The method according to claim 6 , wherein determining the first MCS index according to the acquired first CQI table, the acquired first MCS table, and the received first CQI index comprises:
determining a first transport block size (TBS) index and the first MCS index according to an acquired first physical resource block (PRB) quantity, the acquired first CQI table, the acquired first MCS table, and the received first CQI index, wherein:
the first PRB quantity is a PRB quantity allocated by a base station to the UE, or the first PRB quantity is a maximum integer less than or equal to a product of a PRB quantity allocated to the UE and a specific coefficient;
a first TBS table comprises at least one PRB quantity associated with each TBS index and a transport block size associated with each PRB quantity, wherein the first TBS table is a TBS table associated with the first MCS table; and
a value range of a TBS index in the first TBS table is 0 to B, wherein B is a positive integer greater than or equal to 26; a transport block size associated with a TBS index whose value range is 0 to 26 in the first TBS table is the sam

Assignees

• Huawei Tech Co Ltd

Inventors

• Xia Liang

Classifications

• H04L1/12

  by using return channel · CPC title

• H04L1/0003 Primary

  by switching between different modulation schemes · CPC title

• H04L1/0026 Primary

  Transmission of channel quality indication · CPC title

• H04L5/02

  Channels characterised by the type of signal · CPC title

• H04L1/0009

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