Method and apparatus for notifying channel quality indicator and modulation and coding scheme

Patent metadata

Field	Value
Publication number	US-9973298-B2
Application number	US-201514961597-A
Country	US
Kind code	B2
Filing date	Dec 7, 2015
Priority date	Jun 8, 2013
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

The method includes: learning, by a terminal, a first CQI index according to a first CQI table, and sending the first CQI index to a base station; receiving, by the base station, the first CQI index sent by the terminal device, determining a first MCS index according to the first CQI table, a first MCS table, and the received first CQI index, and sending the determined first MCS index to the terminal device; and 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 an entry in which a modulation scheme is higher than 64 QAM, and the first MCS table includes an entry in which a modulation scheme is higher than 64 QAM.

First claim

What is claimed is:

1. A channel quality indicator (CQI) notifying method comprising:
acquiring a first CQI index according to an acquired first CQI table; and
sending the first CQI index to a base station for determining a first modulation and coding scheme (MCS) index according to the first CQI index, wherein the first CQI table comprises:
an entry in which a modulation scheme is higher than 64 quadrature amplitude modulation (QAM), and
at least one entry, in a second CQI table, with a quadrature phase shift keying (QPSK) modulation scheme, and
at least one entry that is in the second CQI table and in which a modulation scheme is 16QAM;

wherein the at least one entry with a QPSK modulation scheme comprises a combination, other than a first combination, formed by the at least one entry in the second CQI table with a QPSK modulation scheme, wherein the first combination is N entries in the second CQI table where CQI indexes corresponding to QPSK are continuous and have the highest CQI index values, and wherein N is a positive integer; and
wherein modulation schemes in entries in the second CQI table comprise at least one selected from the group consisting of: QPSK, 16QAM, and 64QAM.

2. The method according to claim 1 , wherein a spectral efficiency in an entry in which a corresponding CQI index is greatest among entries that are in the first CQI table and in which a modulation scheme is higher than 64QAM is:
4/3 times a spectral efficiency in an entry in which a corresponding CQI index is greatest among all entries that are in the second CQI table and in which a modulation scheme is 64QAM.

3. The method according to claim 1 , wherein a spectral efficiency in an entry in which a corresponding CQI index is greatest among entries that are in the first CQI table and in which a modulation scheme is higher than 64QAM is 7.4063.

4. A modulation and coding scheme (MCS) notifying method comprising:
receiving a first channel quality indicator (CQI) index sent by a terminal device, wherein the first CQI index is determined by the terminal device according to an acquired first CQI table;
determining a first MCS index according to the acquired first CQI table, an acquired first MCS table, and the received first CQI index; and
sending the determined first MCS index to the terminal device, wherein the first CQI table comprises an entry with a modulation scheme higher than 64 quadrature amplitude modulation (QAM), and the first MCS table comprises:
an entry with a modulation scheme higher than 64QAM, and
at least one entry that is in a second MCS table with a quadrature phase shift keying (QPSK) modulation scheme, and
at least one entry that is in the second MCS table with a 16QAM modulation scheme;

wherein the at least one entry with a QPSK modulation scheme comprises a combination, other than a second combination, formed by the at least one entry that is in the second MCS table with a QPSK modulation scheme, wherein the second combination is K entries that are in the second MCS table and where MCS indexes corresponding to QPSK are continuous and have the highest MCS index values, and K is a positive integer; and
wherein modulation schemes in the second MCS table comprise at least one selected from the group consisting of: QPSK, 16QAM, and 64QAM.

5. The method according to claim 4 , wherein the determining a first MCS index according to the acquired first CQI table, an acquired first MCS table, and the received first CQI index comprises:
determining a first transmission block size (TBS) index and the first MCS index according to a first physical resource block (PRB) quantity, the first CQI table, the first MCS table, and a first TBS table that are acquired, and the received first CQI index, wherein
the first PRB quantity is a PRB quantity allocated to the terminal device by a base station; or the first PRB quantity is a greatest integer less than or equal to a product of the PRB quantity allocated to the terminal device and a specific coefficient; and
the first TBS table comprises at least one PRB quantity corresponding to each TBS index and a transmission block size corresponding to each PRB quantity; and the first TBS table is a TBS table corresponding to the first MCS table.

6. A channel quality indicator (CQI) notifying apparatus comprising:
a processor configured to acquire a first CQI table and acquire a first CQI index according to the first CQI table; and
a transmitter configured to send the first CQI index acquired by the processor to a base station for determining a first modulation and coding scheme (MCS) index according to the first CQI index, wherein
the first CQI table acquired by the processor comprises:
an entry with a modulation scheme higher than 64 quadrature amplitude modulation (QAM), and
at least one entry that is in a second CQI table with (a) a quadrature phase shift keying (QPSK) modulation scheme, and (b) a 16QAM modulation scheme;

wherein the at least one entry with a QPSK modulation scheme comprises a combination, other than a first combination, formed by the at least one entry that is in the second CQI table with a QPSK modulation scheme, wherein the first combination is N entries that are in the second CQI table and where CQI indexes corresponding to QPSK are continuous and have the highest CQI index values, and N is a positive integer; and
wherein modulation schemes in entries in the second CQI table comprise at least one selected from the group consisting of: QPSK, 16QAM, and 64QAM.

7. The apparatus according to claim 6 , wherein a spectral efficiency in an entry in which a corresponding CQI index is greatest among entries that are in the first CQI table and in which a modulation scheme is higher than 64QAM is:
4/3 times a spectral efficiency in an entry in which a corresponding CQI index is greatest among all entries that are in the second CQI table and in which a modulation scheme is 64QAM.

8. The apparatus according to claim 6 , wherein a spectral efficiency in an entry in which a corresponding CQI index is greatest among entries that are in the first CQI table and in which a modulation scheme is higher than 64QAM is 7.4063.

9. A modulation and coding scheme (MCS) notifying apparatus comprising:
a processor configured to acquire a first channel quality indicator (CQI) table and a first MCS table;
a receiver configured to receive a first CQI index sent by a terminal device, wherein the first CQI index is determined by the terminal device according to the first CQI table;
wherein the processor is further configured to determine a first MCS index according to the first CQI table, the acquired first MCS table and the first CQI index; and
a transmitter configured to send the determined first MCS index to the terminal, wherein the first CQI table acquired by the processor comprises: an entry with a modulation scheme higher than 64 quadrature amplitude modulation (QAM), and the first MCS table acquired by the processor comprises:
an entry with a modulation scheme higher than 64QAM, and
at least one entry in a second MCS table with (a) a quadrature phase shift keying (QPSK) modulation scheme, and (b) a 16QAM modulation scheme;

wherein the at least one entry with a QPSK modulation scheme comprises a combination, other than a second combination, formed by the at least one entry that is in the second MCS table with a QPSK modulation scheme, wherein the second combination is K entries that are in the second MCS table and where MCS indexes corresponding to QPSK are continuous and have the highest MCS index values, and K is a positive integer; and
wherein modulation schemes in the second MCS table comprise at least one selected from the group consisting of: QPSK, 16QAM, and 64QAM.

Assignees

• Huawei Tech Co Ltd

Inventors

• Xia Liang
• Xia Yuan

Classifications

• H04L1/0016 Primary

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

• H04L1/0009

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

• H04L1/0003 Primary

  by switching between different modulation schemes · CPC title

• H04L1/0026 Primary

  Transmission of channel quality indication · CPC title

• H04L5/0057

  Physical resource allocation for CQI · CPC title