Method and apparatus of controlling periodic CSI reporting

1. A method of transmitting at least one of a Channel Quality Indicator (CQI) and a Precoding Matrix Indicator (PMI) from a user equipment (UE) to a base station, the method comprising:

establishing a Radio Resource Control (RRC) connection with the base station through a first serving cell, the first serving cell supporting a Time Division Duplex (TDD) mode;

receiving an RRC message from the base station through the first serving cell, the RRC message comprising carrier aggregation (CA) configuration information, the CA configuration information comprising information of a second serving cell supporting a Frequency Division Duplex (FDD) mode, and the first serving cell and the second serving cell being aggregated by a TDD-FDD CA scheme;

determining a periodicity (N pd ) and an offset (N OFFSET,CQI ) based on a cqi-pmi-ConfigIndex received from the base station, the cqi-pmi-ConfigIndex being a numerical parameter, the periodicity (N pd ) being a periodicity for periodically reporting at least one of CQI and PMI with respect to the second serving cell, the offset (N OFFSET,CQI ) being an offset for periodically reporting the at least one of CQI and PMI, and the periodicity (N pd ) being determined further based on a TDD UL(Uplink)/DL(Downlink) configuration of the first serving cell; and

periodically transmitting, to the base station, the at least one of CQI and PMI according to the periodicity (N pd ) and the offset (N OFFSET,CQI ) through the first serving cell or the second serving cell,

wherein the periodicity (N pd ) and the offset (N OFFSET,CQI ) are determined based on the cqi-pmi-ConfigIndex (I CQI/PMI ) shown in Table 1:

TABLE 1

I CQI/PMI

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.

2. The method of claim 1 , further comprising:

when the first serving cell is a primary serving cell supporting the TDD mode, the second serving cell is a secondary serving cell supporting the FDD mode, and the TDD UL/DL configuration of the first serving cell belongs to {0, 1, 3, 4, 6}, receiving the cqi-pmi-ConfigIndex indicating that the periodicity (N pd ) for the second serving cell is set as 1.

3. The method of claim 1 , further comprising:

when the first serving cell is a primary serving cell supporting the TDD mode, the second serving cell is a secondary serving cell supporting the FDD mode, and the TDD UL/DL configuration of the first serving cell belongs to {0, 1, 2, 6}, receiving the cqi-pmi-ConfigIndex indicating that the periodicity (N pd ) for the second serving cell is set as 5.

4. The method of claim 1 , further comprising:

when the first serving cell is a primary serving cell supporting the TDD mode, the second serving cell is a secondary serving cell supporting the FDD mode, and the TDD UL/DL configuration of the first serving cell belongs to {0, 1, 2, 3, 4, 5, 6}, receiving 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:

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

confirming DL reference UL/DL configuration of the first serving cell; and

receiving the cqi-pmi-ConfigIndex from the base station.

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 the CQI and the PMI are received 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 PUCCH being transmitted through the first serving cell or the second serving cell.

8. A method of transmitting at least one of a Channel Quality Indicator (CQI) and a Precoding Matrix Indicator (PMI) from a user equipment (UE) to a base station, the method comprising:

establishing a Radio Resource Control (RRC) connection with the base station through a first serving cell, the first serving cell supporting a Frequency Division Duplex (FDD) mode;

receiving an RRC message from the base station through the first serving cell, the RRC message comprising carrier aggregation (CA) configuration information, the CA configuration information comprising information of a second serving cell supporting a Time Division Duplex (TDD) mode, and the first serving cell and the second serving cell being aggregated by an FDD-TDD CA scheme;

determining a periodicity (N pd ) and an offset (N OFFSET,CQI ) based on a cqi-pmi-ConfigIndex received from the base station, the cqi-pmi-ConfigIndex being a numerical parameter, the periodicity (N pd ) being a periodicity for periodically reporting at least one of CQI and PMI with respect to the second serving cell, and the offset (N OFFSET,CQI ) being an offset for periodically reporting the at least one of CQI and PMI; and

periodically transmitting, to the base station, the at least one of CQI and PMI according to the periodicity (N pd ) and the offset (N OFFSET,CQI ) through the first serving cell or the second serving cell,

wherein 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/PMI

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 method of claim 8 , wherein the CQI and the PMI are received 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 PUCCH being transmitted through the first serving cell or the second serving cell.

10. 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

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,

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 3:

TABLE 3

I CQI/PMI

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/PM − 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.

11. The method of claim 10 , further comprising:

when the first serving cell is a primary serving cell supporting the TDD mode, the second serving cell is a secondary serving cell supporting the FDD mode, and 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.

12. The method of claim 10 , further comprising:

when the first serving cell is a primary serving cell supporting the TDD mode, the second serving cell is a secondary serving cell supporting the FDD mode, and the TDD UL/DL configuration of the first serving cell belongs to {0, 1, 2, 6}, transmitting the cqi-pmi-ConfigIndex indicating that the periodicity (N pd ) for the second serving cell is set as 5.

13. The method of claim 10 , further comprising:

when the first serving cell is a primary serving cell supporting the TDD mode, the second serving cell is a secondary serving cell supporting the FDD mode, and 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.

14. The method of claim 10 , further comprising:

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

15. The method of claim 14 , 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.

16. The method of claim 10 , 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 4

TABLE 4

I CQI/PMI

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.

17. The method of claim 10 , wherein the CQI and the PMI are received 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 PUCCH being transmitted through the first serving cell or the second serving cell.

18. The method of claim 5 , wherein, if the UE is configured with the eIMTA for the first serving cell supporting the TDD mode, the DL reference UL/DL configuration of the first serving cell for DL HARQ is selected from among TDD UL/DL configuration {2, 4, 5}.