Information transmission method and device

Patent metadata

Field	Value
Publication number	US-9479287-B2
Application number	US-201414474532-A
Country	US
Kind code	B2
Filing date	Sep 2, 2014
Priority date	Mar 2, 2012
Publication date	Oct 25, 2016
Grant date	Oct 25, 2016

Abstract

An information transmission method and device are provided. The method includes: reporting, by a UE, a CQI value to an eNB; receiving, by the UE, an MCS value sent by the eNB, where the MCS value is determined by the eNB according to the CQI value; and receiving, by the UE, PDSCH data according to the MCS value, where the CQI value and the MCS value are determined according to a second set of tables, where a modulation scheme that can be supported by the second set of tables is higher than 64QAM.

First claim

What is claimed is:

1. An information transmission method, comprising:
sending, by the UE, a first control signaling to the eNB, wherein the first control signaling is used to indicate that the UE supports a second set of tables;
receiving, by the UE, a second control signaling sent by the eNB, wherein the second control signaling is used to indicate use of the second set of tables;
reporting, by a user equipment (UE), a channel quality indicator (CQI) value to an evolved NodeB (eNB);
receiving, by the UE, a modulation and coding scheme (MCS) value sent by the eNB, wherein the MCS value is determined by the eNB according to the CQI value; and
receiving, by the UE, physical downlink shared channel (PDSCH) data according to the MCS value
wherein the CQI value and the MCS value are determined according to the second set of tables, wherein a modulation scheme that can be supported by the second set of tables is higher than 64 quadrature amplitude modulation (QAM), wherein the second set of tables is different than a first set of tables that support a modulation scheme equal to or less than 64 QAM, and
if the UE receives a third control signaling that is sent by the eNB and used to indicate use of the first set of tables, using, by the UE, the first set of tables to report the CQI value to the eNB so that the eNB determines the MCS value according to the first set of tables.

2. The method according to claim 1 , wherein the eNB performs the following operations to determine the set of tables to be used:
if a reference signal received power (RSRP) or a reference signal received quality (RSRQ) is greater than a predetermined value, determining to use the second set of tables; or
if CQI orders reported by the UE and received in a predetermined time are higher than a predetermined order and data is continuously and correctly received, determining to use the second set of tables.

3. The method according to claim 1 , wherein:
some entries in the second set of tables are the same as those in the first set of tables;
the number of CQI indexes of a CQI table in the second set of tables is the same as that in the first set of tables; and
the number of MCS indexes of an MCS table in the second set of tables is the same as that in the first set of tables, and the MCS table in the second set of tables comprises MCS index entries reserved for hybrid automatic repeat request (HARM) retransmission of a modulation scheme higher than 64QAM.

4. The method according to claim 3 , wherein the second set of tables comprises the CQI table, and spectral efficiency in the CQI table meets the following conditions:
in any modulation scheme whose modulation order is higher than 2, differences between two adjacent spectral efficiency values are approximately equal, wherein a being approximately equal to b means that an absolute value of a difference between a and b is less than a predetermined value; and
a difference between spectral efficiency values that respectively correspond to two adjacent modulation schemes is less than a difference between any two adjacent spectral efficiency values in each modulation scheme in the two modulation schemes.

5. The method according to claim 3 , wherein the second set of tables comprises the MCS table, and the MCS table comprises:
all modulation schemes comprised in the CQI table;
values obtained by performing interpolation for the modulation schemes comprised in the CQI table; and
values obtained by performing extrapolation for the modulation schemes comprised in the CQI table.

6. The method according to claim 3 , wherein the second set of tables comprises the MCS table, and the MCS table comprises:
all modulation schemes comprised in the CQI table;
values obtained by performing interpolation for the modulation schemes comprised in the CQI table; and
values that have same transport block sizes (TBSs) as those of the modulation schemes comprised in the CQI table.

7. The method according to claim 4 , wherein the CQI table comprises:

Code rate ×

CQI index
Modulation
1024
Spectral

(CQI
scheme
(code rate ×
efficiency

index)
(modulation)
1024)
(efficiency)

0
Out of range (out of range)

1
QPSK
75
0.1467

2
QPSK
294
0.5733

3
QPSK
724
1.4133

4
16QAM
423
1.6533

5
16QAM
587
2.2933

6
16QAM
764
2.9867

7
64QAM
573
3.3600

8
64QAM
655
3.8400

9
64QAM
728
4.2667

10
64QAM
801
4.6933

11
64QAM
874
5.1200

12
256QAM
696
5.4400

13
256QAM
778
6.0800

14
256QAM
860
6.7200

15
256QAM
942
7.3600

8. The method according to claim 5 , wherein the MCS table comprises:

Transport block size

Modu

Assignees

• Huawei Tech Co Ltd

Inventors

• Yang Jianbing
• Li Yang
• Cheng Xingqing
• Wan Lei

Classifications

• H04L1/0016 Primary

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

• H04L1/1812

  Hybrid protocols; Hybrid automatic repeat request [HARQ] · CPC title

• H04L1/0025

  Transmission of mode-switching indication · CPC title

• H04L5/00 Primary

  Arrangements affording multiple use of the transmission path · CPC title

• H04L27/36

  Modulator circuits; Transmitter circuits · CPC title