EP-4738755-A2 - TRIGGER RETRANSMISSION OF A FEEDBACK IN UNLICENSED SPECTRUM

EP4738755A2EP 4738755 A2EP4738755 A2EP 4738755A2EP-4738755-A2

Abstract

An apparatus is provided comprising: a memory; a transceiver; and at least one processor coupled to the memory and the transceiver, wherein the apparatus is configured to: communicate, with a second wireless communication device, a downlink control information (DCI) message that schedules a first communication signal and includes a second grant for transmitting a first feedback associated with the first communication signal; communicate, with the second wireless communication device, a first grant for transmitting the first feedback associated with the first communication signal, the second grant being communicated before the first grant for transmitting the first feedback, wherein the first grant comprises a physical uplink control channel (PUCCH) trigger and the first grant does not schedule a physical downlink shared channel (PDSCH) communication; and communicate, with the second wireless communication device, the first feedback based on the first grant.

Inventors

FAN, ZHIFEI
LUO, TAO
ZHANG, XIAOXIA
CHENDAMARAI KANNAN, ARUMUGAM
SUN, JING
ZHOU, YAN
NAM, WOOSEOK
JOHN WILSON, MAKESH PRAVIN

Assignees

QUALCOMM Incorporated

Dates

Publication Date: 20260506
Application Date: 20200109

Claims (15)

An apparatus comprising: a memory; a transceiver; and at least one processor coupled to the memory and the transceiver, wherein the apparatus is configured to: communicate, with a second wireless communication device, a downlink control information (DCI) message that schedules a first communication signal and includes a second grant for transmitting a first feedback associated with the first communication signal; communicate, with the second wireless communication device, a first grant for transmitting the first feedback associated with the first communication signal, the second grant being communicated before the first grant for transmitting the first feedback, wherein the first grant comprises a physical uplink control channel (PUCCH) trigger and the first grant does not schedule a physical downlink shared channel (PDSCH) communication; and communicate, with the second wireless communication device, the first feedback based on the first grant.
The apparatus of claim 1, wherein the first feedback includes at least one of an acknowledgement (ACK) indicating reception of the first communication signal without error or includes a negative-acknowledgement (NACK).
The apparatus of claim 1, wherein the first communication signal is communicated via a physical downlink shared channel (PDSCH).
The apparatus of claim 1, wherein the PUCCH trigger comprises a hybrid automatic repeat request (HARQ) acknowledgment (ACK) request.
The apparatus of claim 1, wherein the apparatus is further configured to: perform a listen-before-talk (LBT) procedure in an unlicensed spectrum for communicating the first feedback based on a second grant, wherein the performing the LBT results in an LBT fail.
The apparatus of claim 5, wherein the apparatus is further configured to: perform the LBT procedure for communicating the first feedback using a first beam: and communicate the first feedback based on the first grant using a second beam different from the first beam.
The apparatus of claim 1, wherein the apparatus is further configured to: transmit, to the second wireless communication device, the DCI message; or transmit, to the second wireless communication device, the first grant.
The apparatus of claim 1, wherein the apparatus is further configured to: receive, from the second wireless communication device, the first feedback; or receive, from the second wireless communication device, the first feedback in an uplink data portion of a slot; or receive, from the second wireless communication device, the first feedback in an uplink control portion of a slot.
A method of wireless communication, comprising: communicating, by a first wireless communication device with a second wireless communication device, a downlink control information (DCI) message that schedules a first communication signal and includes a second grant for transmitting a first feedback associated with the first communication signal; communicating, by the first wireless communication device with the second wireless communication device, a first grant for transmitting the first feedback associated with the first communication signal, the second grant being communicated before the first grant for transmitting the first feedback, wherein the first grant comprises a physical uplink control channel (PUCCH) trigger and the first grant does not schedule a physical downlink shared channel (PDSCH) communication; and communicating, by the first wireless communication device with the second wireless communication device, the first feedback based on the first grant.
The method of claim 9, wherein the communicating the first communication signal comprises communicating the first communication signal via a physical downlink shared channel (PDSCH).
The method of claim 9, wherein the PUCCH trigger comprises a hybrid automatic repeat request (HARQ) acknowledgment (ACK) request.
The method of claim 9, wherein the communicating the first feedback comprises transmitting, by the first wireless communication device to the second wireless communication device, the DCI message.
The method of claim 9, wherein the communicating the first grant comprises transmitting, by the first wireless communication device to the second wireless communication device, the first grant.
The method of claim 9, wherein the communicating the first feedback comprises: receiving, by the first wireless communication device from the second wireless communication device, the first feedback; or receiving, by the first wireless communication device from the second wireless communication device, the first feedback in an uplink data portion of a slot; or receiving, by the first wireless communication device from the second wireless communication device, the first feedback in an uplink control portion of a slot.
A non-transitory computer-readable medium having program code recorded thereon, the program code comprising: code for causing a first wireless communication device to communicate, with a second wireless communication device, a downlink control information (DCI) message that schedules a first communication signal and includes a second grant for transmitting a first feedback associated with the first communication signal; code for causing the first wireless communication device to communicate, with the second wireless communication device, a first grant for transmitting the first feedback associated with the first communication signal, the second grant being communicated before the first grant for transmitting the first feedback, wherein the first grant comprises a physical uplink control channel (PUCCH) trigger and the first grant does not schedule a physical downlink shared channel (PDSCH) communication; and code for causing the first wireless communication device to communicate, with the second wireless communication device, the first feedback based on the first grant.

Description

CROSS REFERENCE TO RELATED APPLICATIONS & PRIORITY CLAIM The present application claims priority to and the benefit of the U.S. Nonprovisional Patent Application No. 16/737,258 filed January 8, 2020, which claims priority to and the benefit of the U.S. Provisional Patent Application No. 62/792,718 filed January 15, 2019, which are hereby incorporated by reference in their entirety. TECHNICAL FIELD This application relates to wireless communication systems, and more particularly to communicating a grant for retransmitting a feedback based on a missed transmission opportunity (TXOP). INTRODUCTION Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). A wireless multiple-access communications system may include a number of base stations (BSs), each simultaneously supporting communications for multiple communication devices, which may be otherwise known as user equipment (UE). To meet the growing demands for expanded mobile broadband connectivity, wireless communication technologies are advancing from the LTE technology to a next generation new radio (NR) technology. For example, NR is designed to provide a lower latency, a higher bandwidth or throughput, and a higher reliability than LTE. NR is designed to operate over a wide array of spectrum bands, for example, from low-frequency bands below about 1 gigahertz (GHz) and mid-frequency bands from about 1 GHz to about 6 GHz, to high-frequency bands such as millimeter wave (mmWave) bands. NR is also designed to operate across different spectrum types, from licensed spectrum to unlicensed and shared spectrum. Spectrum sharing enables operators to opportunistically aggregate spectrums to dynamically support high-bandwidth services. Spectrum sharing can extend the benefit of NR technologies to operating entities that may not have access to a licensed spectrum. One approach to avoiding collisions when communicating in a shared spectrum or an unlicensed spectrum is to use a listen-before-talk (LBT) procedure to ensure that the shared channel is clear before transmitting a signal in the shared channel. For example, a transmitting node may listen to the channel to determine whether there are active transmissions in the channel. When the channel is idle, the transmitting node may transmit a preamble to reserve a transmission opportunity (TXOP) in the shared channel and may communicate with a receiving node during the TXOP. BRIEF SUMMARY OF SOME EXAMPLES The following summarizes some aspects of the present disclosure to provide a basic understanding of the discussed technology. This summary is not an extensive overview of all contemplated features of the disclosure, and is intended neither to identify key or critical elements of all aspects of the disclosure nor to delineate the scope of any or all aspects of the disclosure. Its sole purpose is to present some concepts of one or more aspects of the disclosure in summary form as a prelude to the more detailed description that is presented later. For example, in an aspect of the disclosure, a method of wireless communication includes communicating, by a first wireless communication device with a second wireless communication device, a first communication signal; communicating, by the first wireless communication device with the second wireless communication device, a grant for retransmitting a feedback associated with the first communication signal; and communicating, by the first wireless communication device with the second wireless communication device, the feedback based on the grant. In an additional aspect of the disclosure, an apparatus includes a transceiver configured to communicate, with a second wireless communication device, a first communication signal; communicate, with the second wireless communication device, a grant for retransmitting a feedback associated with the first communication signal; and communicate, with the second wireless communication device, the feedback based on the grant. In an additional aspect of the disclosure, for a computer-readable medium having program code recorded thereon, the program code includes code for causing a first wireless communication device to communicate, with a second wireless communication device, a first communication signal; code for causing the first wireless communication device to communicate, with the second wireless communication device, a grant for retransmitting a feedback associated with the first communication signal; and code for causing the first wireless communication device to communicate, with the second wireless communication device, the feedback based on the grant. In an additional aspect of the disclosure, an apparatus includes means for communicating, with a second wireless communica