Method for reporting channel state information in wireless access system supporting unlicensed bands, and apparatus supporting same

• US 10,492,210 B2
• Filed: 12/23/2015
• Issued: 11/26/2019
• Est. Priority Date: 12/23/2014
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Seonwook, Ahn, Joonkui, Lee, Seungmin, Kim, Kijun, Yang, Suckchel, Seo, Hanbyul, Park, Jonghyun, You, Hyangsun
• Primary Examiner(s): Rivas, Salvador E
• Application Number:
  US15/529,736
• Publication Number:
  US 20170367106A1
• Time in Patent Office: 1,434 Days
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/0689 using different transmission schemes, at least one of them being a diversity transmission scheme
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/2603 Signal structure ensuring backward compatibility with legacy system
• CPC Class Codes: H04L 41/064 involving time analysis
• CPC Class Codes: H04L 47/28 in relation to timing considerations
• CPC Class Codes: H04L 47/74 measures in reaction to resource unavailability
• CPC Class Codes: H04L 47/826 Involving periods of time
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0092 Indication of how the channel is divided
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 72/04 : Wireless resource allocation
• CPC Class Codes: H04W 72/0446 : Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/12 : Wireless traffic scheduling
• CPC Class Codes: H04W 72/1215 : for collaboration of different radio technologies
• CPC Class Codes: H04W 72/23 : in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/0808 : using carrier sensing, e.g. carrier sense multiple access [CSMA]
• CPC Class Codes: H04W 76/15 : Setup of multiple wireless link connections
• CPC Class Codes: H04W 76/28 : Discontinuous transmission [DTX]; Discontinuous reception [DRX]

Abstract

The present invention relates to a wireless access system that supports unlicensed bands, and relates to a method for reporting channel state information when a partial subframe (pSF) is formed. A method for user equipment (UE) reporting channel state information (CSI) in a wireless access system that supports unlicensed bands according to an embodiment of the present invention may comprise the steps of: receiving a downlink burst configured to an unlicensed band cell (U cell) supporting unlicensed bands as far as a certain subframe; measuring CSI with respect to the downlink burst; and reporting the measured CSI to a base station. In this regard, if a pSF is included in the downlink burst, the UE does not consider the pSF to be a valid downlink subframe for CSI measurement, and the pSF may be formed to have a smaller size than a general subframe.

Claims

1. A method for reporting channel state information (CSI) by a user equipment (UE) in a wireless access system supporting an unlicensed band, the method comprising:

receiving a predetermined number of subframes of a downlink burst configured in an unlicensed band cell (UCell) supporting the unlicensed band;

measuring CSI for the downlink burst; and

reporting the measured CSI to a base station (BS),

wherein the downlink burst includes a partial subframe (pSF) configured in a size smaller than a normal subframe, and

wherein the pSF is not considered to be a valid downlink subframe for measuring the CSI.

2. The method according to claim 1, wherein the pSF is scheduled by self-carrier scheduling, and a normal subframe included in the downlink burst is scheduled by cross-carrier scheduling.

3. The method according to claim 1, wherein reporting the CSI in a primacy cell (PCell) configured in a licensed band is requested by the BS, and the measured CSI is reported in the PCell.

4. The method according to claim 1, wherein reporting the CSI in the UCell is requested by the BS, and the measured CSI is reported in the UCell.

5. The method according to claim 1, wherein the CSI is periodically reported in a PCell configured in a licensed band.

6. The method according to claim 1,

wherein a reference resource for measuring the CSI is not allocated to the pSF, and

wherein the measuring the CSI comprises measuring the CSI only in a normal subframe included in the downlink burst.

7. A user equipment (UE) for reporting channel state information (CSI) in a wireless access system supporting an unlicensed band, the UE comprising:

a receiver;

a transmitter; and

a processor configured to support CSI measurement,

wherein the processor is configured to;

control the receiver to receive a predetermined number of subframes of a downlink burst configured in an unlicensed band cell (UCell) supporting the unlicensed band;

measure CSI for the downlink burst; and

control the transmitter to report the measured CSI to a base station (BS),

wherein the downlink burst includes a partial subframe (pSF) configured in a size smaller than a normal subframe, and

wherein the pSF is not considered to be a valid downlink subframe for measuring the CSI.

8. The UE according to claim 7, wherein reporting the CSI reporting in a primacy cell (PCell) configured in a licensed band is requested by the BS, and the measured CSI is reported in the PCell.

9. The UE according to claim 7, wherein reporting the CSI in the UCell is requested by the BS, and the measured CSI is reported in the UCell.

10. The UE according to claim 7, wherein the CSI reported periodically in a PCell configured in a licensed band.

11. The UE according to claim 7,

wherein a reference resource for CSI measurement is not allocated to the pSF, and

wherein the processor is configured to measure the CSI only in a normal subframe included in the downlink burst.

12. The UE according to claim 7, wherein the pSF is scheduled by self-carrier scheduling, and a normal subframe included in the downlink burst is scheduled by cross-carrier scheduling.