METHOD FOR HARQ-ACK/NACK FEEDBACK IN WIRELESS COMMUNICATION SYSTEM AND DEVICE THEREFOR

• US 20200136763A1
• Filed: 06/19/2018
• Published: 04/30/2020
• Est. Priority Date: 06/19/2017
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Hyunho, Hwang, Daesung, YI, Yunjung
• Granted Patent: US 11,245,495 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/06 at the transmitting station
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0031 Multiple signaling transmission H04L1/1664, F15 take precedence
• CPC Class Codes: H04L 1/16 in which the return channel carries supervisory signals, e.g. repetition request signals
• CPC Class Codes: H04L 1/1664 the supervisory signal being transmitted together with payload signals; piggybacking
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 1/18 Automatic repetition systems, e.g. Van Duuren systems
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• 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 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 72/044 based on the type of the allocated resource
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A method for hybrid automatic repeat request-acknowledgment/negative-acknowledgment (HARQ-ACK/NACK) feedback in a wireless communication system, according to one embodiment of the present disclosure, is performed by a terminal and may comprise the steps of: determining an uplink resource for transmitting a NACK if the NACK must be transmitted as HARQ-ACK/NACK feedback for a downlink signal; determining whether to transmit, along with the NACK, a channel quality indicator (CQI) associated with the downlink signal corresponding to the NACK; and if it is determined to transmit the CQI along with the NACK, transmitting the NACK and the CQI on the determined uplink resource.

Claims

1. A method for hybrid automatic repeat request-acknowledgment/negative-acknowledgment (HARQ-ACK/NACK) feedback by a user equipment (UE) in a wireless communication system, the method comprising:

determining an uplink resource for transmitting the NACK based on that a NACK needs to be transmitted as HARQ-ACK/NACK feedback for a downlink signal,;

determining whether to transmit a channel quality indicator (CQI) together with the NACK, wherein the CQI is related to the downlink signal corresponding to the NACK; and

transmitting the NACK and the CQI on the determined uplink resource based on the determination that the NACK and the CQI are transmitted together.

2. The method of claim 1, wherein the uplink resource is determined among a predetermined number of uplink resources, which is indicated by a specific field of downlink control information related to the downlink signal.

3. The method of claim 1, wherein the uplink resource is determined to correspond to the CQI among a preconfigured uplink resource for a HARQ-ACK and a predetermined number of uplink resources separately configured for the NACK transmission.

4. The method of claim 1, further comprising, based on that multiple downlink carriers are configured for the UE and there is a downlink carrier for which a NACK needs to be transmitted, transmitting a CQI for a downlink subcarrier corresponding to a predetermined target service, quality of service (QoS), block error rate (BLER) requirement, and/or latency requirement.

5. The method of claim 1, wherein whether the CQI related to the downlink signal corresponding to the NACK is transmitted together with the NACK is determined depending on whether the downlink signal corresponding to the NACK corresponds to a predetermined target service, quality of service (QoS), block error rate (BLER) requirement, and/or latency requirement or based on a scrambling identifier or format of downlink control information scheduling the downlink signal.

6. The method of claim 5, wherein a HARQ codebook size for the downlink signal corresponding to the NACK is determined as a sum of a bit number for the HARQ-ACK/NACK and a bit number of the CQI.

7. A user equipment (UE) for transmitting hybrid automatic repeat request-acknowledgment/negative-acknowledgment (HARQ-ACK/NACK) feedback in a wireless communication system, the UE comprising:

a receiver;

a transmitter; and

a processor controls the receiver and the transmitter,

wherein the processor that;

determine an uplink resource for transmitting the NACK based on that a NACK needs to be transmitted as HARQ-ACK/NACK feedback for a downlink signal;

determine whether to transmit a channel quality indicator (CQI) together with the NACK, wherein the CQI is related to the downlink signal corresponding to the NACK; and

transmit the NACK and the CQI on the determined uplink resource based on the determination that the NACK and the CQI are transmitted together.

8. The UE of claim 7, wherein the uplink resource is determined among a predetermined number of uplink resources, which is indicated by a specific field of downlink control information related to the downlink signal.

9. The UE of claim 7, wherein the uplink resource is determined to correspond to the CQI among a preconfigured uplink resource for a HARQ-ACK and a predetermined number of uplink resources separately configured for the NACK transmission.

10. The UE of claim 7, wherein based on that multiple downlink carriers are configured for the UE and there is a downlink carrier for which a NACK needs to be transmitted, the processor is configured to transmit a CQI for a downlink subcarrier corresponding to a predetermined target service, quality of service (QoS), block error rate (BLER) requirement, and/or latency requirement.

11. The UE of claim 7, wherein whether the CQI related to the downlink signal corresponding to the NACK is transmitted together with the NACK is determined depending on whether the downlink signal corresponding to the NACK corresponds to a predetermined target service, quality of service (QoS), block error rate (BLER) requirement, and/or latency requirement or based on a scrambling identifier or format of downlink control information scheduling the downlink signal.

12. The UE of claim 11, wherein a HARQ codebook size for the downlink signal corresponding to the NACK is determined as a sum of a bit number for the HARQ-ACK/NACK and a bit number of the CQI.

13. The UE of claim 7, wherein the UE is a part of an autonomous driving device that communicates with at least a network or another autonomous device.