Method and apparatus of controlling periodic CSI reporting

Patent metadata

Field	Value
Publication number	US-9510332-B2
Application number	US-201414529000-A
Country	US
Kind code	B2
Filing date	Oct 30, 2014
Priority date	Nov 1, 2013
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

Abstract

Exemplary embodiments of the present invention relates to an apparatus and method for performing periodic CSI reporting available in a system supporting a TDD-FDD aggregation operation and an FDD-TDD aggregation operation. A periodicity and an offset for periodic reporting of channel quality indicator and precoding matrix indicator may be determined based on the cell type of a primary serving cell for a TDD-FDD carrier aggregation and an FDD-TDD carrier aggregation.

First claim

What is claimed is:

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 ≦

Assignees

• Innovative Tech Lab Co Ltd

Inventors

• Park Dong Hyun

Classifications

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04L1/1812

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

• H04B7/0647

  Variable feedback rate · CPC title

• H04L5/14

  Two-way operation using the same type of signal, i.e. duplex · CPC title

• H04B7/0639

  Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection · CPC title