Method and apparatus of controlling periodic CSI reporting

1. A method of receiving at least one of a Channel Quality Indicator (CQI) and a Precoding Matrix Indicator (PMI) by a base station, the method comprising:

establishing a Radio Resource Control (RRC) connection with a user equipment (UE) through a first serving cell, the first serving cell supporting a Time Division Duplex (TDD) mode or a Frequency Division Duplex (FDD) mode;

transmitting an RRC message for the UE through the first serving cell, the RRC message comprising carrier aggregation (CA) configuration information and a cqi-pmi-ConfigIndex, the CA configuration information comprising information of a second serving cell supporting an FDD mode or a TDD mode, and the first serving cell and the second serving cell being aggregated by a TDD-FDD CA scheme or an FDD-TDD CA scheme for the UE;

periodically receiving, from the UE, at least one of CQI and PMI with respect to the second serving cell, the at least one of CQI and PMI being received through the first serving cell or the second serving cell,

wherein a periodicity (N pd ) and an offset (N OFFSET,CQI ) for the at least one of CQI and PMI are determined based on the cqi-pmi-ConfigIndex, the cqi-pmi-ConfigIndex is a numerical parameter, the periodicity (N pd ) is a periodicity for periodically reporting the at least one of CQI and PMI with respect to the second serving cell, and the offset (N OFFSET,CQI ) is an offset for periodically reporting the at least one of CQI and PMI, and

when, the first serving cell supports an FDD mode and the second serving cell supports a TDD mode, the periodicity (N pd ) and the offset (N OFFSET,CQI ) are determined based on the cqi-pmi-ConfigIndex (I CQ/PMI ) shown in Table 1:

TABLE 1

I CQI/PM

Value of N pd

Value of N OFFSET, CQI

0 ≤ I CQI/PMI ≤ 1

2

I CQI/PMI

2 ≤ I CQI/PMI ≤ 6

5

I CQI/PMI − 2 

 7 ≤ I CQI/PMI ≤ 16

10

I CQI/PMI − 7 

17 ≤ I CQI/PMI ≤ 36

20

I CQI/PMI − 17 

37 ≤ I CQI/PMI ≤ 76

40

I CQI/PMI − 37 

 77 ≤ I CQI/PMI ≤ 156

80

I CQI/PMI − 77 

157 ≤ I CQI/PMI ≤ 316

160

I CQI/PMI − 157

I CQI/PMI = 317

Reserved

318 ≤ I CQI/PMI ≤ 349

32

I CQI/PMI − 318

350 ≤ I CQI/PMI ≤ 413

64

I CQI/PMI − 350

414 ≤ I CQI/PMI ≤ 541

128

I CQI/PMI − 414

 542 ≤ I CQI/PMI ≤ 1023

 Reserved.

2. The method of claim 1 , wherein, when the first serving cell supports a TDD mode and the second serving cell supports an FDD mode, the periodicity (N pd ) is determined further based on a TDD UL(Uplink)/DL(Downlink) configuration of the first serving cell.

3. The method of claim 2 , wherein the TDD UL/DL configuration of the first serving cell belongs to {0, 1, 3, 4, 6}, transmitting the cqi-pmi-ConfigIndex indicating that the periodicity (N pd ) for the second serving cell is set as 1.

4. The method of claim 2 , wherein the TDD UL/DL configuration of the first serving cell belongs to {0, 1, 2, 3, 4, 5, 6}, transmitting the cqi-pmi-ConfigIndex indicating that the periodicity (N pd ) for the second serving cell is set as one of 10, 20, 40, 80, and 160.

5. The method of claim 1 , further comprising:

transmitting information to configure enhanced Interference Management and Traffic Adaptation (eIMTA) for the first serving cell.

6. The method of claim 5 , wherein, if the UE is configured with the eIMTA for the first serving cell supporting the TDD mode, the TDD UL/DL configuration of the first serving cell corresponds to DL reference UL/DL configuration.

7. The method of claim 1 , wherein, when the first serving cell supports a TDD mode and the second serving cell supports an FDD mode, the periodicity (N pd ) and the offset (N OFFSET,CQI ) are determined based on the cqi-pmi-ConfigIndex (I CQI/PMI ) shown in Table 2:

TABLE 2

I CQI/PM

Value of N pd

Value of N OFFSET, CQI

I CQI/PMI = 0

1

I CQI/PMI

1 ≤ I CQI/PMI ≤ 5

5

I CQI/PMI − 1 

 6 ≤ I CQI/PMI ≤ 15

10

I CQI/PMI − 6 

16 ≤ I CQI/PMI ≤ 35

20

I CQI/PMI − 16

36 ≤ I CQI/PMI ≤ 75

40

I CQI/PMI − 36

 76 ≤ I CQI/PMI ≤ 155

80

I CQI/PMI − 76

156 ≤ I CQI/PMI ≤ 315

160

 I CQI/PMI − 156

 316 ≤ I CQI/PMI ≤ 1023

Reserved.

8. A base station receiving at least one of a Channel Quality Indicator (CQI) and a Precoding Matrix Indicator (PMI) from a User Equipment (UE), the base station comprising:

a transmitting unit configured to transmit a Radio Resource Control (RRC) message for the UE through the first serving cell the first serving cell supporting a Time Division Duplex (TDD) mode or a Frequency Division Duplex (FDD) mode, the RRC message comprising carrier aggregation (CA) configuration information and a cqi-pmi-ConfigIndex, the CA configuration information comprising information of a second serving cell supporting an FDD mode or a TDD mode, and the first serving cell and the second serving cell being aggregated by a TDD-FDD CA scheme or an FDD-TDD CA scheme for the UE; and

a receiving unit configured to periodically receive, from the UE, at least one of CQI and PMI with respect to the second serving cell, the at least one of CQI and PMI being received through the first serving cell or the second serving cell,

wherein a periodicity (N pd ) and an offset (N OFFSET,CQI ) for the at least one of CQI and PMI are determined based on the cqi-pmi-ConfigIndex, the cqi-pmi-ConfigIndex is a numerical parameter, the periodicity (N pd ) is a periodicity for periodically reporting the at least one of CQI and PMI with respect to the second serving cell, and the offset (N OFFSET,CQI ) is an offset for periodically reporting the at least one of CQI and PMI, and

when, the first serving cell supports an FDD mode and the second serving cell supports a TDD mode, the periodicity (N pd ) and the offset (N OFFSET,CQI ) are determined based on the cqi-pmi-ConfigIndex (I CQI/PMI ) shown in Table 3:

TABLE 3

I CQI/PM

Value of N pd

Value of N OFFSET, CQI

0 ≤ I CQI/PMI ≤ 1

2

I CQI/PMI

2 ≤ I CQI/PMI ≤ 6

5

I CQI/PMI − 2 

 7 ≤ I CQI/PMI ≤ 16

10

I CQI/PMI − 7 

17 ≤ I CQI/PMI ≤ 36

20

I CQI/PMI − 17 

37 ≤ I CQI/PMI ≤ 76

40

I CQI/PMI − 37 

 77 ≤ I CQI/PMI ≤ 156

80

I CQI/PMI − 77 

157 ≤ I CQI/PMI ≤ 316

160

I CQI/PMI − 157

I CQI/PMI = 317

Reserved

318 ≤ I CQI/PMI ≤ 349

32

I CQI/PMI − 318

350 ≤ I CQI/PMI ≤ 413

64

I CQI/PMI − 350

414 ≤ I CQI/PMI ≤ 541

128

I CQI/PMI − 414

 542 ≤ I CQI/PMI ≤ 1023

 Reserved.

9. The base station of claim 8 , wherein, when the first serving cell supports a TDD mode and the second serving cell supports an FDD mode, the periodicity (N pd ) is determined further based on a TDD UL(Uplink)/DL(Downlink) configuration of the first serving cell.

10. The base station of claim 9 , wherein the TDD UL/DL configuration of the first serving cell belongs to {0, 1, 3, 4, 6}, transmitting the cqi-pmi-ConfigIndex indicating that the periodicity (N pd ) for the second serving cell is set as 1.

11. The base station of claim 9 , wherein the TDD UL/DL configuration of the first serving cell belongs to {0, 1, 2, 3, 4, 5, 6}, transmitting the cqi-pmi-ConfigIndex indicating that the periodicity (N pd ) for the second serving cell is set as one of 10, 20, 40, 80, and 160.

12. The base station of claim 8 , wherein the transmitter transmits information to configure enhanced Interference Management and Traffic Adaptation (eIMTA) for the first serving cell.

13. The base station of claim 12 , wherein, if the UE is configured with the eIMTA for the first serving cell supporting the TDD mode, the TDD UL/DL configuration of the first serving cell corresponds to DL reference UL/DL configuration.

14. The base station of claim 9 , wherein, when the first serving cell supports a TDD mode and the second serving cell supports an FDD mode, the processor is configured to determine the periodicity (N pd ) and the offset (N OFFSET,CQI ) based on the cqi-pmi-ConfigIndex (I CQI/PMI ) shown in Table 4:

TABLE 4

I CQI/PM

Value of N pd

Value of N OFFSET, CQI

I CQI/PMI = 0

1

I CQI/PMI

1 ≤ I CQI/PMI ≤ 5

5

I CQI/PMI − 1 

 6 ≤ I CQI/PMI ≤ 15

10

I CQI/PMI − 6 

16 ≤ I CQI/PMI ≤ 35

20

I CQI/PMI − 16

36 ≤ I CQI/PMI ≤ 75

40

I CQI/PMI − 36

 76 ≤ CQI/PMI ≤ 155

80

I CQI/PMI − 76

156 ≤ I CQI/PMI ≤ 315

160

 I CQI/PMI − 156

 316 ≤ I CQI/PMI ≤ 1023

Reserved.

15. The base station of claim 8 , wherein the receiver receives the CQI and the PMI as channel state information for the second serving cell, and the CQI and the PMI are included in a Physical Uplink Control Channel (PUCCH), and

wherein the receiver receives the PUCCH through the first serving cell or the second serving cell.