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

Patent metadata

Field	Value
Publication number	US-10079654-B2
Application number	US-201514961569-A
Country	US
Kind code	B2
Filing date	Dec 7, 2015
Priority date	Jun 8, 2013
Publication date	Sep 18, 2018
Grant date	Sep 18, 2018

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 64 QAM.

First claim

What is claimed is:

1. A notification method for a channel quality indicator (CQI), the method comprising:
learning, by a user equipment (UE), a first CQI index according to an acquired first CQI table; and
sending, by the UE, 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:
(a) entries in which modulation schemes are higher than 64 quadrature amplitude modulation (QAM);
(b) at least one entry in which a modulation scheme is quadrature phase shift keying (QPSK) in a second CQI table, wherein modulation schemes in entries in the second CQI table comprise only QPSK, 16 QAM, and 64 QAM; and
(c) at least one entry in which a modulation scheme is 16 QAM in the second CQI table;

wherein the at least one entry in which the modulation scheme is QPSK comprises a combination taken from among multiple combinations in the second CQI table except a first combination that is N entries with consecutive maximum CQI indices corresponding to QPSK in the second CQI table, wherein N is equal to 3.

2. The method according to claim 1 , wherein the at least one entry in which the modulation scheme is QPSK in the second CQI table comprises:
some entries in which modulation schemes are QPSK in the second CQI table, wherein CQI indices corresponding to the some entries are at equal intervals.

3. The method according to claim 1 , wherein the first CQI table further comprises at least one entry in which a modulation scheme is 64 QAM in the second CQI table.

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

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

6. A notification method for a modulation and coding scheme (MCS), the method comprising:
receiving, by a base station, a first channel quality indicator (CQI) index sent by user equipment (UE), wherein the first CQI index is determined by the UE according to an acquired first CQI table;
determining, by the base station, a first MCS index according to the acquired first CQI table, an acquired first MCS table, and the received first CQI index; and
sending, by the base station, the determined first MCS index to the UE;
wherein the first CQI table comprises:
(a) entries in which modulation scheme are higher than 64 quadrature amplitude modulation (QAM); and
(b) at least one entry in which a modulation scheme is quadrature phase shift keying (QPSK) in a second CQI table, wherein modulation schemes in the second CQI table comprise only QPSK, 16 QAM, and 64 QAM; and
(c) at least one entry in which a modulation scheme is 16 QAM in the second CQI table;
wherein the at least one entry in which the modulation scheme is QPSK comprises a combination taken from among multiple combinations in the second CQI table except a first combination that is N entries with consecutive maximum CQI indices corresponding to QPSK in the second CQI table, wherein N is equal to 3;
and
the first MCS table comprises:
(a) entries in which modulation schemes are higher than 64 QAM; and
(b) at least one entry in which a modulation scheme is QPSK in a second MCS table, and
(c) at least one entry in which a modulation scheme is 16 QAM in the second MCS table;
wherein the at least one entry in which the modulation scheme is QPSK comprises a combination taken from among multiple combinations in the second MCS table except a second combination that is K entries with consecutive maximum MCS indices corresponding to QPSK in the second MCS table, wherein K is equal to 4.

7. The method according to claim 6 , 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 TBS index and the first MCS index according to an acquired first 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 corresponding to each TBS index and a transport block size corresponding to each PRB quantity, wherein the first TBS table is a TBS table corresponding to 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 corresponding to a TBS index whose value range is 0 to 26 in the first TBS table is the same as a transport block size corresponding to a TBS index whose value range is 0 to 26 in a second TBS table; a value range of a TBS index in the second TBS table is 0 to 26; and the second TBS table comprises at least one PRB quantity corresponding to each TBS index and a transport block size corresponding to each PRB quantity.

8. The method according to claim 7 , wherein the determining a first TBS index according to an acquired first PRB quantity, the acquired first CQI table, the acquired first MCS table, and the received first CQI index comprises:
determining, according to the first CQI table and the received first CQI index, a first modulation scheme and a first spectrum efficiency that correspond to the received first CQI index;
learning, according to the first PRB quantity and the first spectrum efficiency, a first transport block size transmitted to the UE; and
obtaining, according to the first TBS table, the first TBS index that corresponds to the first transport block size and the first PRB quantity in the first TBS table.

9. The method according to claim 6 , wherein the at least one entry in which the modulation scheme is QPSK in the second MCS table comprises:
some entries in which modulation schemes are QPSK in the second MCS table, wherein MCS indices corresponding to the some entries are at equal intervals.

10. The method according to claim 6 , wherein the first MCS table further comprises:
at least one entry in which a modulation scheme is 64 QAM in the second MCS table.

11. The method according to claim 10 , wherein the at least one entry in which the modulation scheme is 64 QAM in the second MCS table comprises:
some entries in which modulation schemes are 64 QAM in the second MCS table, and at least one entry, except an entry with a minimum MCS index, of all entries in which modulation schemes are 64 QAM in the second MCS table.

12. A notification apparatus for a channel quality indicator (CQI) comprising:
a processor configured to acquire a first CQI table;
the processor configured to learn a first CQI index according to the first CQI table; and
a transmitter configured to send the first CQI index learned 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:
(a) entries in which modula

Assignees

• Huawei Tech Co Ltd

Inventors

• Xia Liang

Classifications

• H04L1/0009

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

• H04L1/0026 Primary

  Transmission of channel quality indication · CPC title

• H04L1/0003 Primary

  by switching between different modulation schemes · CPC title

• H04L5/0057

  Physical resource allocation for CQI · CPC title

• H04L5/02

  Channels characterised by the type of signal · CPC title