# US 10,484,068 B2 · Method for reporting channel state information in wireless communication system and apparatus for the same

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- Number: US 10,484,068 B2
- Document ID: US10484068B2
- Status: Granted
- Kind: B2
- Application number: 16/200,008
- Filed: 2018-11-26
- Published: 2019-05-30
- Granted: 2019-11-19
- Earliest claimed: 2017-11-24
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Hyungtae Kim; Jiwon Kang
- Web page: https://patentgrep.com/patent/US10484068B2

## CPC

- H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]}
- H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B 7/0643: {Feedback on request}
- H04B 7/0645: {Variable feedback}
- H04L 1/0026: {Transmission of channel quality indication}
- H04L 1/0027: {Scheduling of signalling, e.g. occurrence thereof}
- H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports}
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 72/20: Control channels or signalling for resource management
- H04W 72/542: using measured or perceived quality
- Y02D 30/70: in wireless communication networks
- H04B: TRANSMISSION
- 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)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A method of reporting, by a user equipment (UE), channel state information (CSI) in a wireless communication system, includes: receiving, by the UE and from a base station (BS), downlink control information (DCI) related to an aperiodic CSI report that is to be performed by the UE in a slot n; determining, by the UE, a value nCQI_ref based on a number of symbols Z′ related to a time for computing the CSI; determining, by the UE, a CSI reference resource as being a slot n−nCQI_ref in a time domain that is to be used for the aperiodic CSI report; and transmitting, by the UE and to the BS, the aperiodic CSI report in the slot n, based on the CSI reference resource being slot n−nCQI_ref. The CSI may be calculated by using the most recent A CSI-RS, and thereby the most recent CSI may be reported.

## Claims

### Claim 1

A method of reporting, by a user equipment (UE), channel state information (CSI) in a wireless communication system, the method comprising:
receiving, by the UE and from a base station (BS), downlink control information (DCI) related to an aperiodic CSI report that is to be performed by the UE in a slot n;
determining, by the UE, a value nCQI_ref based on a number of symbols Z′ related to a time for computing the CSI;
determining, by the UE, a CSI reference resource as being a slot n−nCQI_ref in a time domain that is to be used for the aperiodic CSI report; and
transmitting, by the UE and to the BS, the aperiodic CSI report in the slot n, based on the CSI reference resource being slot n−nCQI_ref,
wherein the nCQI_ref is a smallest value greater than or equal to └Z′/Nsymbslot┘ such that the slot n−nCQI_ref satisfies a valid downlink slot criteria, and
wherein └·┘ is a floor function and Nsymbslot is a number of symbols in one slot.

### Claim 2 (depends on 1)

The method of claim 1, wherein the valid downlink slot criteria is based at least on (i) the number of symbols Z′ related to the time for computing the CSI and (ii) a DCI processing time.

### Claim 3 (depends on 1)

The method of claim 1, wherein Nsymbslot is equal to 14 symbols in a slot.

### Claim 4 (depends on 1)

The method of claim 1, further comprising:
receiving, from the BS, an aperiodic reference signal (CSI-RS) in the CSI reference resource, slot n−nCQI_ref;
determining the CSI based on the aperiodic CSI-RS; and
generating the aperiodic CSI report based on the CSI.

### Claim 5 (depends on 1)

The method of claim 1, further comprising:
determining the number of symbols Z′ related to the time for computing the CSI based on a CSI complexity and a subcarrier spacing.

### Claim 6 (depends on 5)

The method of claim 5, wherein the number of symbols Z′ does not include a DCI processing time.

### Claim 7 (depends on 1)

The method of claim 1, wherein determining the value nCQI_ref based on the number of symbols Z′ related to the time for computing the CSI comprises:
determining the value nCQI_ref based on the number of symbols Z′ related to the time for computing the CSI, and further based on a number of symbols in one slot.

### Claim 8 (depends on 1)

The method of claim 1, wherein receiving the DCI comprises:
receiving the DCI in a slot other than the slot n in which the aperiodic CSI report is to be performed.

### Claim 9 (depends on 1)

The method of claim 1, wherein, based on the value nCQI_ref being equal to zero, the aperiodic CSI report is performed in a same slot as receiving the DCI.

### Claim 10

A user equipment (UE) configured to report channel state information (CSI) in a wireless communication system, the UE comprising:
a radio frequency (RF) module configured to transmit and receive radio signals;
at least one processor; and
at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:
receiving, via the RF module and from a base station (BS), downlink control information (DCI) related to an aperiodic CSI report that is to be performed by the UE in a slot n;
determining, by the UE, a value nCQI_ref based on a number of symbols Z′ related to a time for computing the CSI;
determining, by the UE, a CSI reference resource as being a slot n−nCQI_ref in a time domain that is to be used for the aperiodic CSI report; and
transmitting, via the RF module and to the BS, the aperiodic CSI report in the slot n, based on the CSI reference resource being slot n−nCQI_ref,
wherein the nCQI_ref is a smallest value greater than or equal to └Z′/Nsymbslot┘ such that the slot n−nCQI_ref satisfied a valid downlink slot criteria, and
wherein └·┘ is a floor function and Nsymbslot is a number of symbols in one slot.

### Claim 11 (depends on 10)

The UE of claim 10, wherein the valid downlink slot criteria is based at least on (i) the number of symbols Z′ related to the time for computing the CSI and (ii) a DCI processing time.

### Claim 12 (depends on 10)

The UE of claim 10, wherein Nsymbslot is equal to 14 symbols in a slot.

### Claim 13 (depends on 10)

The UE of claim 10, wherein the operations further comprise:
receiving, via the RF module and from the BS, an aperiodic reference signal (CSI-RS) in the CSI reference resource, slot n−nCQI_ref;
determining the CSI based on the aperiodic CSI-RS; and
generating the aperiodic CSI report based on the CSI.

### Claim 14 (depends on 10)

The UE of claim 10, wherein determining the number of symbols Z′ related to the time for computing the CSI comprises:
determining the number of symbols Z′ related to the time for computing the CSI based on a CSI complexity and a subcarrier spacing.

### Claim 15 (depends on 14)

The UE of claim 14, wherein the number of symbols Z′ does not include a DCI processing time.

### Claim 16 (depends on 10)

The UE of claim 10, wherein determining the value nCQI_ref based on the number of symbols Z′ related to the time for computing the CSI comprises:
determining the value nCQI_ref based on the number of symbols Z′ and further based on information related to a subcarrier spacing.

### Claim 17 (depends on 10)

The UE of claim 10, wherein receiving the DCI comprises:
receiving the DCI in a slot other than the slot n in which the aperiodic CSI report is to be performed.

### Claim 18 (depends on 10)

The UE of claim 10, wherein, based on the value nCQI_ref being equal to zero, the aperiodic CSI report is performed in a same slot as receiving the DCI.