FIELD OF THE DISCLOSURE

Aspects of the present disclosure generally relate to wireless communication, and to techniques and apparatuses for uplink control information (UCI) configuration for random access channel (RACH).

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 (e.g., bandwidth, transmit power, etc.). 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).

A wireless communication network may include a number of base stations (BSs) that can support communication for a number of user equipment (UEs). A user equipment (UE) may communicate with a base station (BS) via the downlink and uplink. The downlink (or forward link) refers to the communication link from the BS to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a Node B, a gNB, an access point (AP), a radio head, a transmit receive point (TRP), a New Radio (NR) BS, a 5G Node B, and/or the like.

The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user equipment 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 Third Generation Partnership Project (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 and/or SC-FDM (e.g., 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.

SUMMARY

In some aspects, a method of wireless communication, performed by a user equipment (UE), may include initiating a random access channel (RACH) procedure using a first beam associated with a base station (BS) and transmitting, to the BS and during the RACH procedure, an uplink control information (UCI) communication that indexes into a resource set of beams to indicate one or more second beams associated with the BS.

In some aspects, a UE 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 initiate a RACH procedure using a first beam associated with a BS and transmit, to the BS and during the RACH procedure, a UCI communication that indexes into a resource set of beams to indicate one or more second beams associated with the BS.

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 UE, may cause the one or more processors to initiate a RACH procedure using a first beam associated with a BS and transmit, to the BS and during the RACH procedure, a UCI communication that indexes into a resource set of beams to indicate one or more second beams associated with the BS.

In some aspects, an apparatus for wireless communication may include means for initiating a RACH procedure using a first beam associated with a BS and means for transmitting, to the BS and during the RACH procedure, a UCI communication that indexes into a resource set of beams to indicate one or more second beams associated with the BS.

In some aspects, a method of wireless communication, performed by a BS, may include receiving, from a UE and during a RACH procedure, a UCI communication that indicate respective indexes associated with one or more beams associated with the BS; and identifying, based at least in part on the respective indexes, the one or more beams in a resource set of beams.

In some aspects, a BS 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 UE and during a RACH procedure, a UCI communication that indicate respective indexes associated with one or more beams associated with the BS and identify, based at least in part on the respective indexes, the one or more beams in a resource set of beams.

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 BS, may cause the one or more processors to receive, from a UE and during a RACH procedure, a UCI communication that indicate respective indexes associated with one or more beams associated with the BS and identify, based at least in part on the respective indexes, the one or more beams in a resource set of beams.

In some aspects, an apparatus for wireless communication may include means for receiving, from a UE and during a RACH procedure, a UCI communication that indicate respective indexes associated with one or more beams associated with the apparatus and means for identifying, based at least in part on the respective indexes, the one or more beams in a resource set of beams.

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

The foregoing has outlined rather broadly the features and technical advantages of examples according to 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.

