FIELD OF THE DISCLOSURE

Aspects of the present disclosure generally relate to wireless communication, and more particularly to techniques and apparatuses for distance and angle based sidelink hybrid automatic repeat request (HARQ).

BACKGROUND

Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (for example, bandwidth, transmit power, or the like, or a combination thereof). Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency-division multiple access (FDMA) systems, orthogonal frequency-division multiple access (OFDMA) systems, single-carrier frequency-division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE). LTE/LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP).

The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user equipments (UEs) to communicate on a municipal, national, regional, and even global level. New Radio (NR), which may also be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the 3GPP. NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL), using CP-OFDM or SC-FDM (for example, also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation. However, as the demand for mobile broadband access continues to increase, there exists a need for further improvements in LTE and NR technologies. Preferably, these improvements are applicable to other multiple access technologies and the telecommunication standards that employ these technologies.

In a wireless network, two or more subordinate entities, such as two or more UEs or two or more integrated access and backhaul (IAB) nodes, may communicate with each other using sidelink communications. In some cases, a receiver may provide feedback associated with a sidelink communication that a transmitter transmitted to the receiver on a sidelink (for example, from transmitter UE to receiver UE or from transmitter IAB node to receiver IAB node). The feedback may include, for example, hybrid automatic repeat request (HARQ) feedback (such as an acknowledgement (ACK) or a negative acknowledgement (NACK) for the sidelink communication). The receiver may transmit the HARQ feedback in one or more HARQ feedback communications on the sidelink. In some aspects, the transmitter may be capable of using beamforming and a plurality of antenna panels (which, in some cases, may be referred to as multi-panel) to receive HARQ feedback on a sidelink. In this way, the transmitter may use beamforming to increase the distance by which HARQ feedback may be received, may use multi-panel to increase the angular range by which HARQ feedback may be received, or a combination thereof. However, the receiver may be unaware of the distances or angles at which the transmitter is capable of using beamforming or multi-panel to receive HARQ feedback, and may be unaware of the time-domain locations and frequency-domain locations at which particular beams or antenna panels of the transmitter will be active for receiving HARQ feedback.

SUMMARY

In some aspects, a method of wireless communication, performed by a transmitter, may include transmitting a sidelink communication and sidelink control information (SCI), associated with the sidelink communication, that indicates one or more distance parameter and angle parameter combinations for hybrid automatic repeat request (HARQ) feedback; and receiving HARQ feedback, for the sidelink communication, on a sidelink and from a receiver that satisfies a distance parameter and angle parameter combination of the one or more distance parameter and angle parameter combinations.

In some aspects, a method of wireless communication, performed by a receiver, may include receiving, from a transmitter, a sidelink communication and SCI, associated with the sidelink communication, that indicates one or more distance parameter and angle parameter combinations for HARQ feedback; determining that the receiver satisfies a distance parameter and angle parameter combination of the one or more distance parameter and angle parameter combinations; and transmitting, based at least in part on determining that the receiver satisfies the distance parameter and angle parameter combination, HARQ feedback for the sidelink communication to the transmitter on a sidelink.

In some aspects, a transmitter for wireless communication may include memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to transmit a sidelink communication and SCI, associated with the sidelink communication, that indicates one or more distance parameter and angle parameter combinations for HARQ feedback; and receive HARQ feedback, for the sidelink communication, on a sidelink and from a receiver that satisfies a distance parameter and angle parameter combination of the one or more distance parameter and angle parameter combinations.

In some aspects, a receiver for wireless communication may include memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to receive, from a transmitter, a sidelink communication and SCI, associated with the sidelink communication, that indicates one or more distance parameter and angle parameter combinations for HARQ feedback; determine that the receiver satisfies a distance parameter and angle parameter combination of the one or more distance parameter and angle parameter combinations; and transmit, based at least in part on determining that the receiver satisfies the distance parameter and angle parameter combination, HARQ feedback for the sidelink communication to the transmitter on a sidelink.

In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a receiver, may cause the one or more processors to: transmit a sidelink communication and SCI, associated with the sidelink communication, that indicates one or more distance parameter and angle parameter combinations for HARQ feedback; and receive HARQ feedback, for the sidelink communication, on a sidelink and from a receiver that satisfies a distance parameter and angle parameter combination of the one or more distance parameter and angle parameter combinations.

In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a receiver, may cause the one or more processors to: receive, from a transmitter, a sidelink communication and SCI, associated with the sidelink communication, that indicates one or more distance parameter and angle parameter combinations for HARQ feedback; determine that the receiver satisfies a distance parameter and angle parameter combination of the one or more distance parameter and angle parameter combinations; and transmit, based at least in part on determining that the receiver satisfies the distance parameter and angle parameter combination, HARQ feedback for the sidelink communication to the transmitter on a sidelink.

In some aspects, an apparatus for wireless communication may include means for transmitting a sidelink communication and SCI, associated with the sidelink communication, that indicates one or more distance parameter and angle parameter combinations for HARQ feedback; and means for receiving HARQ feedback, for the sidelink communication, on a sidelink and from a receiver that satisfies a distance parameter and angle parameter combination of the one or more distance parameter and angle parameter combinations.

In some aspects, an apparatus for wireless communication may include means for receiving, from a transmitter, a sidelink communication and SCI, associated with the sidelink communication, that indicates one or more distance parameter and angle parameter combinations for HARQ feedback; means for determining that the apparatus satisfies a distance parameter and angle parameter combination of the one or more distance parameter and angle parameter combinations; and means for transmitting, based at least in part on determining that the apparatus satisfies the distance parameter and angle parameter combination, HARQ feedback for the sidelink communication to the transmitter on a sidelink.

Aspects generally include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, wireless communication device, or processing system as substantially described with reference to and as illustrated by the drawings and specification.

The foregoing has outlined rather broadly the features and technical advantages of examples in accordance with the disclosure in order that the detailed description that follows may be better understood. Additional features and advantages will be described hereinafter. The conception and specific examples disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. Characteristics of the concepts disclosed herein, both their organization and method of operation, together with associated advantages will be better understood from the following description when considered in connection with the accompanying figures. Each of the figures is provided for the purposes of illustration and description, and not as a definition of the limits of the claims.

