US-12621036-B2 - Spatial domain transmission relation considerations for shared channel repetitions

US12621036B2US 12621036 B2US12621036 B2US 12621036B2US-12621036-B2

Abstract

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may initiate a random access procedure with a base station. The UE may transmit a random access channel (RACH) preamble to the base station. The UE may receive, from the base station and in response to the RACH preamble, a random access response (RAR) message. The UE may then identify a beam configuration for transmission of repetitions of an uplink transmission response to the RAR message. The UE may then transmit the repetitions of the uplink transmission using one or more beams in accordance with the beam configuration.

Inventors

Hung Dinh Ly
Kexin XIAO
Hwan Joon Kwon

Assignees

QUALCOMM INCORPORATED

Dates

Publication Date: 20260505
Application Date: 20210115

Claims (20)

1 . A method for wireless communications for a user equipment (UE), comprising: transmitting a random access channel preamble to a network entity; receiving, from the network entity and in response to the random access channel preamble, a random access response message; identifying a beam configuration for transmission of repetitions of an uplink transmission responsive to the random access response message; transmitting the repetitions of the uplink transmission using one or more beams in accordance with the beam configuration; and transmitting repetitions of one or more retransmissions of the uplink transmission, wherein the repetitions of the uplink transmission and the repetitions of the one or more retransmissions of the uplink transmission are transmitted using different beams for respective repetitions within the uplink transmission and the one or more retransmissions of the uplink transmission, in accordance with the beam configuration.
2 . The method of claim 1 , wherein transmitting the repetitions of the uplink transmission comprises: transmitting the repetitions of the uplink transmission using a same beam for each repetition of the uplink transmission, in accordance with the beam configuration.
3 . The method of claim 1 , wherein transmitting the repetitions of the uplink transmission comprises: transmitting the repetitions of the uplink transmission using a different beam for each repetition of the uplink transmission, in accordance with the beam configuration.
4 . The method of claim 1 , wherein the uplink transmission comprises an initial transmission of the uplink transmission responsive to the random access response message of a four-step random access procedure.
5 . The method of claim 1 , wherein the uplink transmission comprises a retransmission of the uplink transmission responsive to the random access response message of a four-step random access procedure.
6 . The method of claim 1 , wherein identifying the beam configuration comprises: receiving an indication of the beam configuration in the random access response message.
7 . The method of claim 1 , wherein identifying the beam configuration comprises: receiving an indication of the beam configuration in a system information message.
8 . The method of claim 1 , wherein identifying the beam configuration comprises: receiving an indication of the beam configuration in a downlink control information message that includes a cyclic redundancy check scrambled by either a random access radio network temporary identifier or a temporary cell random access radio network temporary identifier.
9 . The method of claim 1 , wherein the one or more beams each correspond to a different spatial domain filter.
10 . The method of claim 1 , wherein the repetitions of the uplink transmission are repeated using a same symbol allocation in consecutive slots.
11 . A method for wireless communications at a network entity, comprising: receiving a random access channel preamble from a user equipment (UE); transmitting, to the UE and in response to the random access channel preamble, a random access response message; transmitting an indication of a beam configuration for UE transmission of repetitions of an uplink transmission responsive to the random access response message; receiving the repetitions of the uplink transmission from the UE in accordance with the beam configuration; and receiving repetitions of one or more retransmissions of the uplink transmission, wherein the beam configuration indicates that the repetitions of the uplink transmission and the repetitions of the one or more retransmissions of the uplink transmission are to be transmitted by the UE using a different beam for respective repetitions within the uplink transmission and the one or more retransmissions of the uplink transmission.
12 . The method of claim 11 , wherein the beam configuration indicates that the repetitions are to be transmitted by the UE using a same beam for each repetition of the uplink transmission.
13 . The method of claim 11 , wherein the beam configuration indicates that the repetitions are to be transmitted by the UE using a different beam for each repetition of the uplink transmission.
14 . The method of claim 11 , wherein the uplink transmission comprises an initial transmission of the uplink transmission responsive to the random access response message of a four-step random access procedure.
15 . The method of claim 11 , wherein the uplink transmission comprises a retransmission of the uplink transmission responsive to the random access response message of a four-step random access procedure.
16 . The method of claim 11 , wherein transmitting the indication of the beam configuration comprises: transmitting the indication of the beam configuration in the random access response message.
17 . The method of claim 11 , wherein transmitting the indication of the beam configuration comprises: transmitting the indication of the beam configuration in a system information message.
18 . The method of claim 11 , wherein transmitting the indication of the beam configuration comprises: transmitting the indication of the beam configuration in a downlink control information message that includes a cyclic redundancy check scrambled by either a random access radio network temporary identifier or a temporary cell random access radio network temporary identifier.
19 . The method of claim 11 , wherein the repetitions of the uplink transmission are repeated using a same symbol allocation in consecutive slots.
20 . An apparatus for wireless communications for a user equipment (UE), comprising: a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: transmit a random access channel preamble to a network entity; receive, from the network entity and in response to the random access channel preamble, a random access response message; identify a beam configuration for transmission of repetitions of an uplink transmission responsive to the random access response message; transmit the repetitions of the uplink transmission using one or more beams in accordance with the beam configuration; and transmit repetitions of one or more retransmissions of the uplink transmission, wherein the repetitions of the uplink transmission and the repetitions of the one or more retransmissions of the uplink transmission are transmitted using different beams for respective repetitions within the uplink transmission and the one or more retransmissions of the uplink transmission, in accordance with the beam configuration.

Description

CROSS REFERENCE The present Application is a 371 national stage filing of International PCT Application No. PCT/CN2021/072036 by L Y et al. entitled “SPATIAL DOMAIN TRANSMISSION RELATION CONSIDERATIONS FOR SHARED CHANNEL REPETITIONS,” filed Jan. 15, 2021, which is assigned to the assignee hereof, and which is expressly incorporated by reference in its entirety herein. FIELD OF TECHNOLOGY The following relates to wireless communications, including spatial domain transmission relation considerations for shared channel repetitions. BACKGROUND 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). Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple-access communications system may include one or more base stations or one or more network access nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE). A UE may initiate communications with a base station according to a random access procedure. The UE may transmit messages of the random access procedure using a set of beams, or spatial domain filters. SUMMARY The described techniques relate to improved methods, systems, devices, and apparatuses that support spatial domain transmission relation considerations for shared channel repetitions. Generally, the described techniques provide for a user equipment (UE) communicating using a set of beams with a base station, including communicating according to a random access procedure. A UE may initiate a random access procedure with a base station by transmitting a random access channel (RACH) preamble to the base station. The UE may receive, from the base station and in response to the RACH preamble, a random access response (RAR) message. The UE may then identify a beam configuration for transmission of repetitions of an uplink transmission response to the RAR message. The beam configuration for the repetitions of the uplink transmission response may be a default beam configuration that is based, at least in part, on a beam configuration for an initial repetition. In other instances, the beam configuration for the repetitions may be received in a message from the base station. In some examples, the beam configuration may be received in the RAR message, or may be received in system information (SI) messages or other downlink control information (DCI) messages. The beam configuration may direct that repetitions of the uplink transmission response are to use a same beam or spatial domain transmission relation or filter. Alternatively, the beam configuration may direct that different beams or spatial domain transmission relations or filters are to be used by repetitions of the uplink transmission response. Beams or spatial domain transmission relations or filters of repetitions in different transmissions (for example, of an initial uplink transmission response and of one or more retransmissions of the uplink transmission response) may also be the same across transmissions or may vary, based on the beam configuration. The UE transmits the repetitions of the uplink transmission using one or more beams or spatial domain transmission relations or filters in accordance with the beam configuration. A method for wireless communications for a user equipment (UE) is described. The method may include transmitting a RACH preamble to a base station, receiving, from the base station and in response to the RACH preamble, a RAR message, identifying a beam configuration for transmission of repetitions of an uplink transmission responsive to the RAR message, and transmitting the repetitions of the uplink transmission using one or more beams in accordance with the beam configuration. An apparatus for wireless communications for a UE is described. The apparatus may include a processor, memory in electronic communication with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to transmit a RACH preamble to a base station, receive, from the base station and in response to the RACH preamble, a RAR message, identify a beam configuration for transmission of repetitions of an uplink transmissio