# US 11,445,451 B2 · Method and device for reporting channel state information

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- Number: US 11,445,451 B2
- Document ID: US11445451B2
- Status: Granted
- Kind: B2
- Application number: 17/108,211
- Filed: 2020-12-01
- Published: 2021-03-18
- Granted: 2022-09-13
- Earliest claimed: 2016-08-08
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Joonkui Ahn; Daesung Hwang; Hyunsoo Ko; Yunjung Yi; Hyunho Lee; Seonwook Kim; Suckchel Yang; Hanjun Park
- Web page: https://patentgrep.com/patent/US11445451B2

## CPC

- H04L 5/0032: {Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation}
- H04W 52/365: {Power headroom reporting}
- H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH}
- H04L 5/0087: {when data requirements change}
- H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information}
- H04W 52/36: with a discrete range or set of values, e.g. step size, ramping or offsets
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 72/12: Wireless traffic scheduling
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 74/08: Non-scheduled access, e.g. ALOHA (hybrid access H04W74/02)
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04L 5/001: {the frequencies being arranged in component carriers}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04L 5/0057: {Physical resource allocation for CQI}
- H04W 52/146: {Uplink power control}
- H04W 52/38: TPC being performed in particular situations
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Provided are a method and a device for reporting channel state information (CSI) in a wireless communication system. A wireless device receives a first uplink grant for indicating that a transmission of a physical uplink shared channel (PUSCH) is triggered by a second uplink grant in a first subframe on a Licensed-Assisted Access (LAA) cell. The first uplink grant requests a report of an aperiodic CSI. The wireless device computes the aperiodic CSI based on a valid subframe no later than the first subframe in which the first uplink grant is received.

## Claims

### Claim 1

A method for reporting channel state information (CSI) in a wireless communication system, the method performed by a wireless device and comprising:
receiving a first uplink grant for indicating that a transmission of a physical uplink shared channel (PUSCH) is triggered by a second uplink grant in a first subframe on a Licensed-Assisted Access (LAA) cell, the first uplink grant further requesting a report of an aperiodic CSI, the first uplink grant including a first timing offset;
receiving the second uplink grant for triggering the transmission of the PUSCH in a second subframe on the LAA cell, the second uplink grant including a second timing offset;
determining a third subframe in which the PUSCH is to be transmitted based on the first timing offset and the second timing offset;
computing the aperiodic CSI based on a valid subframe no later than the first subframe in which the first uplink grant is received; and
transmitting the PUSCH in the third subframe on the LAA cell, the PUSCH including the computed aperiodic CSI.

### Claim 2 (depends on 1)

The method of claim 1, wherein the LAA cell is a secondary cell to be activated by a primary cell.

### Claim 3 (depends on 1)

The method of claim 1, wherein the first subframe is a subframe n, the second subframe is a subframe n+k, and the third subframe is a subframe n+k+l, where n is a natural number, k is a value obtained from the first timing offset and 1 is a value obtained from the second timing offset.

### Claim 4

A device for reporting channel state information (CSI) in a wireless communication system, the device comprising:
a processor; and
a memory operatively coupled with the processor and configured to store instructions that, when executed by the processor, cause the device to perform functions comprising:
receiving a first uplink grant for indicating that a transmission of a physical uplink shared channel (PUSCH) is triggered by a second uplink grant in a first subframe on a Licensed-Assisted Access (LAA) cell, the first uplink grant further requesting a report of an aperiodic CSI, the first uplink grant including a first timing offset;
receiving the second uplink grant for triggering the transmission of the PUSCH in a second subframe on the LAA cell, the second uplink grant including a second timing offset;
determining a third subframe in which the PUSCH is to be transmitted based on the first timing offset and the second timing offset;
computing the aperiodic CSI based on a valid subframe no later than the first subframe in which the first uplink grant is received; and
transmitting the PUSCH in the third subframe on the LAA cell, the PUSCH including the computed aperiodic CSI.

### Claim 5 (depends on 4)

The device of claim 4, wherein the LAA cell is a secondary cell to be activated by a primary cell.

### Claim 6 (depends on 4)

The device of claim 4, wherein the first subframe is a subframe n, the second subframe is a subframe n+k, and the third subframe is a subframe n+k+l, where n is a natural number, k is a value obtained from the first timing offset and 1 is a value obtained from the second timing offset.