Enhanced random access for multiple synchronization signal blocks per random access occasion

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit, in a synchronization signal block (SSB) beam direction, at least one preamble in a random access channel (RACH) occasion (RO) associated with multiple SSBs. The UE may monitor, in the SSB beam direction, at least one search space for a random access response (RAR) associated with the at least one preamble. Numerous other aspects are described.

Description

ENHANCED RANDOM ACCESS FOR MULTIPLE SYNCHRONIZATION SIGNAL BLOCKS PER RANDOM ACCESS OCCASIONCROSS-REFERENCE TO RELATED APPLICATIONThis Patent Application claims priority to U.S. Provisional Patent Application No. 63 / 684,958, filed on August 20, 2024, entitled “ENHANCED RANDOM ACCESS FOR MULTIPLE SYNCHRONIZATION SIGNAL BLOCKS PER RANDOM ACCESS OCCASION,” and U.S. Nonprovisional Patent Application No. 19 / 279,530, filed on July 24, 2025, entitled “ENHANCED RANDOM ACCESS FOR MULTIPLE SYNCHRONIZATION SIGNAL BLOCKS PER RANDOM ACCESS OCCASION,” which are hereby expressly incorporated by reference herein.FIELD OF THE DISCLOSURE

[0001] Aspects of the present disclosure generally relate to wireless communication and specifically relate to techniques, apparatuses, and methods associated with enhanced random access for multiple synchronization signal blocks per random access occasion.BACKGROUND

[0002] Wireless communication systems are widely deployed to provide various services that may include carrying voice, text, messaging, video, data, and / or other traffic. The services may include unicast, multicast, and / or broadcast services, among other examples. Typical wireless communication systems may employ multiple-access radio access technologies (RATs) capable of supporting communication with multiple users by sharing available system resources (for example, time domain resources, frequency domain resources, spatial domain resources, and / or device transmit power, among other examples). Examples of such multiple-access RATs 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, and time division synchronous code division multiple access (TD-SCDMA) systems.

[0003] The above multiple-access RATs have been adopted in various telecommunication standards to provide common protocols that enable different wireless communication devices to communicate on a municipal, national, regional, or global level. An example telecommunication standard is New Radio (NR). NR, which may also be referred to as 5G, is part of a continuous mobile broadband evolution promulgated by the Third Generation Partnership Project (3 GPP). NR (and other mobile broadband evolutions beyond NR) may be designed to better support Internet of things (loT) and reduced capability device deployments,0097-5744PCTindustrial connectivity, millimeter wave (mmWave) expansion, licensed and unlicensed spectrum access, non-terrestrial network (NTN) deployment, sidelink and other device-to- device direct communication technologies (for example, cellular vehicle-to-everything (CV2X) communication), massive multiple-input multiple -output (MIMO), disaggregated network architectures and network topology expansions, multiple-subscriber implementations, high- precision positioning, and / or radio frequency (RF) sensing, among other examples. As the demand for mobile broadband access continues to increase, further improvements in NR may be implemented, and other radio access technologies such as 6G may be introduced, to further advance mobile broadband evolution.BRIEF DESCRIPTION OF THE DRAWINGS

[0004] The appended drawings illustrate some aspects of the present disclosure, but are not limiting of the scope of the present disclosure because the description may enable other aspects. Each of the drawings is provided for purposes of illustration and description, and not as a definition of the limits of the claims. The same or similar reference numbers in different drawings may identify the same or similar elements.

[0005] Fig. 1 is a diagram illustrating an example of a wireless communication network, in accordance with the present disclosure.

[0006] Fig. 2 is a diagram illustrating an example network node in communication with an example user equipment (UE) in a wireless network, in accordance with the present disclosure.

[0007] Fig. 3 is a diagram illustrating an example disaggregated base station architecture, in accordance with the present disclosure.

[0008] Fig. 4 is a diagram illustrating an example of a synchronization signal hierarchy, in accordance with the present disclosure.

[0009] Fig. 5 is a diagram illustrating an example of a four-step random access procedure, in accordance with the present disclosure.

[0010] Fig. 6 is a diagram illustrating an example of a two-step random access procedure, in accordance with the present disclosure.

[0011] Figs. 7A-7B are diagrams illustrating examples of a synchronization signal block (SSB)-random access channel occasion (RO) mapping, in accordance with the present disclosure.

[0012] Figs. 8A-8B are diagrams illustrating examples associated with enhanced random access for multiple SSBs per RO, in accordance with the present disclosure.

[0013] Fig. 9 is a diagram illustrating an example process performed, for example, at a UE or an apparatus of a UE, in accordance with the present disclosure.0097-5744PCT

[0014] Fig. 10 is a diagram illustrating an example process performed, for example, at a network node or an apparatus of a network node, in accordance with the present disclosure.

[0015] Figs. 11-12 are diagrams of example apparatuses for wireless communication, in accordance with the present disclosure.SUMMARY

[0016] Some aspects described herein relate to a user equipment (UE) for wireless communication. The UE may include one or more memories and one or more processors coupled to the one or more memories. The one or more processors may be configured to transmit, in a synchronization signal block (SSB) beam direction, at least one preamble in a random access channel (RACH) occasion (RO) associated with multiple SSBs. The one or more processors may be configured to monitor, in the SSB beam direction, at least one search space for a random access response (RAR) associated with the at least one preamble.

[0017] Some aspects described herein relate to a network node for wireless communication. The network node may include one or more memories and one or more processors coupled to the one or more memories. The one or more processors may be configured to receive, in an RO associated with multiple SSBs, a first preamble via a first SSB receive beam and a second preamble via a second SSB receive beam. The one or more processors may be configured to transmit, in a search space, a first RAR indicating the first preamble and a first SSB index associated with the first SSB receive beam. The one or more processors may be configured to transmit, in the search space, a second RAR indicating the second preamble and a second SSB index associated with the second SSB receive beam.

[0018] Some aspects described herein relate to a method of wireless communication performed by a UE. The method may include transmitting, in an SSB beam direction, at least one preamble in an RO associated with multiple SSBs. The method may include monitoring, in the SSB beam direction, at least one search space for an RAR associated with the at least one preamble.

[0019] Some aspects described herein relate to a method of wireless communication performed by a network node. The method may include receiving, in an RO associated with multiple SSBs, a first preamble via a first SSB receive beam and a second preamble via a second SSB receive beam. The method may include transmitting, in a search space, a first RAR indicating the first preamble and a first SSB index associated with the first SSB receive beam. The method may include transmitting, in the search space, a second RAR indicating the second preamble and a second SSB index associated with the second SSB receive beam.

[0020] Some aspects described herein relate to a non-transitory computer-readable medium that stores a set of instructions for wireless communication by a UE. The set of instructions,0097-5744PCTwhen executed by one or more processors of the UE, may cause the UE to transmit, in an S SB beam direction, at least one preamble in an RO associated with multiple SSBs. The set of instructions, when executed by one or more processors of the UE, may cause the UE to monitor, in the SSB beam direction, at least one search space for an RAR associated with the at least one preamble.

[0021] Some aspects described herein relate to a non-transitory computer-readable medium that stores a set of instructions for wireless communication by a network node. The set of instructions, when executed by one or more processors of the network node, may cause the network node to receive, in an RO associated with multiple SSBs, a first preamble via a first SSB receive beam and a second preamble via a second SSB receive beam. The set of instructions, when executed by one or more processors of the network node, may cause the network node to transmit, in a search space, a first RAR indicating the first preamble and a first SSB index associated with the first SSB receive beam. The set of instructions, when executed by one or more processors of the network node, may cause the network node to transmit, in the search space, a second RAR indicating the second preamble and a second SSB index associated with the second SSB receive beam.

[0022] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for transmitting, in an SSB beam direction, at least one preamble in an RO associated with multiple SSBs. The apparatus may include means for monitoring, in the SSB beam direction, at least one search space for an RAR associated with the at least one preamble.

[0023] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for receiving, in an RO associated with multiple SSBs, a first preamble via a first SSB receive beam and a second preamble via a second SSB receive beam. The apparatus may include means for transmitting, in a search space, a first RAR indicating the first preamble and a first SSB index associated with the first SSB receive beam. The apparatus may include means for transmitting, in the search space, a second RAR indicating the second preamble and a second SSB index associated with the second SSB receive beam.

[0024] Aspects of the present disclosure may generally be implemented by or as a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, network node, network entity, wireless communication device, and / or processing system as substantially described with reference to, and as illustrated by, the specification and accompanying drawings.

[0025] The foregoing paragraphs of this section have broadly summarized some aspects of the present disclosure. These and additional aspects and associated advantages will be described hereinafter. The disclosed aspects may be used as a basis for modifying or designing0097-5744PCTother aspects for carrying out the same or similar purposes of the present disclosure. Such equivalent aspects do not depart from the scope of the appended claims. Characteristics of the aspects 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 drawings.DETAILED DESCRIPTION

[0026] Various aspects of the present disclosure are described hereinafter with reference to the accompanying drawings. However, aspects of the present disclosure may be embodied in many different forms and is not to be construed as limited to any specific aspect illustrated by or described with reference to an accompanying drawing or otherwise presented in this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. One skilled in the art may appreciate that the scope of the disclosure is intended to cover any aspect of the disclosure disclosed herein, whether implemented independently of or in combination with any other aspect of the disclosure. For example, an apparatus may be implemented or a method may be practiced using various combinations or quantities of the aspects set forth herein. In addition, the scope of the disclosure is intended to cover an apparatus having, or a method that is practiced using, other structures and / or functionalities in addition to or other than the structures and / or functionalities with which various aspects of the disclosure set forth herein may be practiced. Any aspect of the disclosure disclosed herein may be embodied by one or more elements of a claim.

[0027] Several aspects of telecommunication systems will now be presented with reference to various methods, operations, apparatuses, and techniques. These methods, operations, apparatuses, and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, or algorithms (collectively referred to as “elements”). These elements may be implemented using hardware, software, or a combination of hardware and software. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

[0028] As described herein, a physical random access channel (PRACH) occasion, also known as a random access channel (RACH) occasion, a random access occasion, or an RO, generally includes time resources and frequency resources that a user equipment (UE) can use to transmit a PRACH preamble to initiate a RACH procedure. Furthermore, a network node may generally transmit a synchronization signal block (SSB) using different directional beams, and a UE may select a certain beam (corresponding to an SSB beam direction) to use when transmitting the PRACH preamble. Accordingly, to enable the UE to select an RO and to0097-5744PCTenable the network node to determine which beam the UE selected to transmit the PRACH preamble, an SSB-RO mapping may defined to associate each RO with one or more SSBs. For example, a RACH configuration may include a parameter (e.g., ssb-perRACH-OccasionAndCB- PreamblesPerSSB) indicating that N consecutive SSBs indexes are associated with one RO. In general, when a RACH configuration indicates that a single SSB is associated with each RO (e.g., N= 1), there may be a significant variation in RACH latency and / or a significant variation in data interruption during a handover. For example, when a network node transmits an SSB using multiple SSB beams and a single SSB is associated with each RO, the RACH latency and / or data interruption may be significantly higher for an SSB with a highest SSB index (e.g., associated with a latest RO in a time domain) relative to an SSB with a lowest SSB index. On the other hand, when a RACH configuration indicates that multiple SSBs are associated with each RO (e.g., N > 1), there may be less variation in the RACH latency and / or handover data interruption. For example, a single RO can be used to transmit a PRACH preamble using a beam associated with any of the multiple SSB indexes associated with the RO, resulting in a more consistent RACH latency and / or handover data interruption.

[0029] However, when each RO is associated with multiple SSBs, there are circumstances in which a UE may unnecessarily retransmit the PRACH preamble, which increases RACH latency, increases data interruption during handover, and / or increases UE power consumption, among other examples. For example, in a scenario where a first SSB and a second SSB are associated with the same RO, a first UE may transmit a first PRACH preamble using a first beam associated with the first SSB and a second UE may transmit a second PRACH preamble using a second beam associated with the second SSB. In a RACH procedure, following the PRACH preamble transmission, a UE is expected to monitor a common search space for a random access response (RAR) during an RAR window and decode an uplink grant in response to receiving an RAR that includes a random access preamble identifier (RAPID) that matches an identifier associated with the PRACH preamble transmitted by the UE. For example, the UE generally monitors the common search space for an RAR with a cyclic redundancy code (CRC) scrambled by a random access radio network temporary identifier (RA-RNTI) that is computed according to various parameters associated with the RO in which the PRACH preamble was transmitted.

[0030] Accordingly, when the network node transmits a first RAR for the first UE and a second RAR for the second UE using different frequency resources in the same slot or transmission time interval (TTI), the two RARs include CRCs scrambled by the same RA- RNTI, but different RAPIDs, corresponding to the different preambles transmitted by the respective UEs. In such a scenario, the first UE may detect the second RAR intended for the second UE, and unnecessarily retransmit the PRACH preamble when the RAPID included in the second RAR does not match the identifier of the first PRACH preamble transmitted by the first0097-5744PCTUE (e.g., without decoding the correct RAR intended for the first UE). Alternatively, if the network node were to transmit the two RARs associated with the same RA-RNTI in different slots (e.g., to differentiate the RARs associated with different SSBs that are mapped to the same RO), the RAR would be delayed for any UEs that used a beam other than a beam associated with the SSB having the lowest SSB index, which results in a longer RACH latency, a longer call setup latency, and / or a longer handover data interruption for such UEs.

[0031] Various aspects relate generally to enhanced random access, or enhancements to random access or RACH procedures, for RACH configurations associated with multiple SSBs per RO. Some aspects more specifically relate to enhanced RAR configurations to differentiate RARs that are associated with PRACH preambles transmitted via different SSB beams in the same RO. For example, when a network node detects multiple PRACH preamble transmissions associated with different SSB receive beam directions in the same RO, the network node may schedule multiple RARs that each indicate a respective SSB index. Accordingly, when the network node transmits the RARs, which may include CRCs scrambled by the same RA-RNTI (e.g., associated with parameters related to the RO), a UE may retransmit the PRACH preamble in cases where the UE detects a RAR that indicates a RAPID that differs from the preamble ID associated with the PRACH preamble transmitted by the UE and an SSB index that matches the SSB associated with the beam selected by the UE. Alternatively, the UE may continue RAR decoding to search for an RAR intended for the UE in cases where the RAR indicates a RAPID that differs from the preamble ID associated with the PRACH preamble transmitted by the UE and an SSB index that differs from the SSB associated with the beam selected by the UE (e.g., the different RAPID and the different SSB index may indicate that the RAR is intended for another UE that transmitted a PRACH preamble in the same RO using a beam associated with a different SSB than the SSB selected by the UE). Alternatively, in some aspects, the SSB index associated with the PRACH preamble may be included among the parameters used to compute an RA-RNTI. In such cases, each UE that transmits a PRACH preamble in an RO associated with multiple SSBs may monitor for an RAR with a CRC scrambled by an RA-RNTI associated with the SSB selected by the UE, such that a UE will not erroneously decode an RAR associated with a PRACH preamble transmitted via a beam associated with a different SSB. In this way, by indicating the SSB index in the RAR or using the SSB index to compute the RA-RNTI associated with a RAR, some aspects described herein may reduce PRACH preamble retransmissions and the associated increase in RACH latency and / or power consumption that may otherwise occur when two or more UEs transmit a PRACH preamble in the same RO using beams associated with different SSBs.

[0032] Multiple-access radio access technologies (RATs) have been adopted in various telecommunication standards to provide common protocols that enable wireless communication devices to communicate on a municipal, enterprise, national, regional, or global level. For0097-5744PCTexample, 5G New Radio (NR) is part of a continuous mobile broadband evolution promulgated by the Third Generation Partnership Project (3GPP). 5G NR supports various technologies and use cases including enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), massive machine-type communication (mMTC), millimeter wave (mmWave) technology, beamforming, network slicing, edge computing, Internet of Things (loT) connectivity and management, and network function virtualization (NFV).

[0033] As the demand for broadband access increases and as technologies supported by wireless communication networks evolve, further technological improvements may be adopted in or implemented for 5G NR or future RATs, such as 6G, to further advance the evolution of wireless communication for a wide variety of existing and new use cases and applications. Such technological improvements may be associated with new frequency band expansion, licensed and unlicensed spectrum access, overlapping spectrum use, small cell deployments, nonterrestrial network (NTN) deployments, disaggregated network architectures and network topology expansion, device aggregation, advanced duplex communication, sidelink and other device-to-device direct communication, loT (including passive or ambient loT) networks, reduced capability (RedCap) UE functionality, industrial connectivity, multiple-subscriber implementations, high-precision positioning, radio frequency (RF) sensing, and / or artificial intelligence or machine learning (AI / ML), among other examples. These technological improvements may support use cases such as wireless backhauls, wireless data centers, extended reality (XR) and metaverse applications, meta services for supporting vehicle connectivity, holographic and mixed reality communication, autonomous and collaborative robots, vehicle platooning and cooperative maneuvering, sensing networks, gesture monitoring, human-brain interfacing, digital twin applications, asset management, and universal coverage applications using non-terrestrial and / or aerial platforms, among other examples. The methods, operations, apparatuses, and techniques described herein may enable one or more of the foregoing technologies and / or support one or more of the foregoing use cases.

[0034] Fig. 1 is a diagram illustrating an example of a wireless communication network 100, in accordance with the present disclosure. The wireless communication network 100 may be or may include elements of a 5G (or NR) network or a 6G network, among other examples. The wireless communication network 100 may include multiple network nodes 110, shown as a network node (NN) 110a, a network node 110b, a network node 110c, and a network node 1 lOd. The network nodes 110 may support communications with multiple UEs 120, shown as a UE 120a, a UE 120b, a UE 120c, a UE 120d, and a UE 120e.

[0035] The network nodes 110 and the UEs 120 of the wireless communication network 100 may communicate using the electromagnetic spectrum, which may be subdivided by frequency or wavelength into various classes, bands, carriers, and / or channels. For example, devices of the wireless communication network 100 may communicate using one or more operating bands.0097-5744PCTIn some aspects, multiple wireless communication networks 100 may be deployed in a given geographic area. Each wireless communication network 100 may support a particular RAT (which may also be referred to as an air interface) and may operate on one or more carrier frequencies in one or more frequency ranges. Examples of RATs include a 4G RAT, a 5G / NR RAT, and / or a 6G RAT, among other examples. In some examples, when multiple RATs are deployed in a given geographic area, each RAT in the geographic area may operate on different frequencies to avoid interference with one another.

[0036] Various operating bands have been defined as frequency range designations FR1 (410 MHz through 7.125 GHz), FR2 (24.25 GHz through 52.6 GHz), FR3 (7.125 GHz through 24.25 GHz), FR4a or FR4-1 (52.6 GHz through 71 GHz), FR4 (52.6 GHz through 114.25 GHz), and FR5 (114.25 GHz through 300 GHz). Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as a “Sub-6 GHz” band in some documents and articles. Similarly, FR2 is often referred to (interchangeably) as a “millimeter wave” band in some documents and articles, despite being different than the extremely high frequency (EHF) band (30 GHz through 300 GHz), which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band. The frequencies between FR1 and FR2 are often referred to as mid-band frequencies, which include FR3. Frequency bands falling within FR3 may inherit FR1 characteristics or FR2 characteristics, and thus may effectively extend features of FR1 or FR2 into mid-band frequencies. Thus, “sub-6 GHz,” if used herein, may broadly refer to frequencies that are less than 6 GHz, that are within FR1, and / or that are included in mid-band frequencies. Similarly, the term “millimeter wave,” if used herein, may broadly refer to frequencies that are included in mid-band frequencies, that are within FR2, FR4, FR4-a or FR4- 1, or FR5, and / or that are within the EHF band. Higher frequency bands may extend 5G NR operation, 6G operation, and / or other RATs beyond 52.6 GHz. For example, each of FR4a, FR4-1, FR4, and FR5 falls within the EHF band. In some examples, the wireless communication network 100 may implement dynamic spectrum sharing (DSS), in which multiple RATs (for example, 4G / Long Term Evolution (LTE) and 5G / NR) are implemented with dynamic bandwidth allocation (for example, based on user demand) in a single frequency band. It is contemplated that the frequencies included in these operating bands (for example, FR1, FR2, FR3, FR4, FR4-a, FR4-1, and / or FR5) may be modified, and techniques described herein may be applicable to those modified frequency ranges.

[0037] A network node 110 may include one or more devices, components, or systems that enable communication between a UE 120 and one or more devices, components, or systems of the wireless communication network 100. A network node 110 may be, may include, or may also be referred to as an NR network node, a 5G network node, a 6G network node, a Node B, an eNB, a gNB, an access point (AP), a transmission reception point (TRP), a mobility element,0097-5744PCTa core, a network entity, a network element, a network equipment, and / or another type of device, component, or system included in a radio access network (RAN).

[0038] A network node 110 may be implemented as a single physical node (for example, a single physical structure) or may be implemented as two or more physical nodes (for example, two or more distinct physical structures). For example, a network node 110 may be a device or system that implements part of a radio protocol stack, a device or system that implements a full radio protocol stack (such as a full gNB protocol stack), or a collection of devices or systems that collectively implement the full radio protocol stack. For example, and as shown, a network node 110 may be an aggregated network node (having an aggregated architecture), meaning that the network node 110 may implement a full radio protocol stack that is physically and logically integrated within a single node (for example, a single physical structure) in the wireless communication network 100. For example, an aggregated network node 110 may consist of a single standalone base station or a single TRP that uses a full radio protocol stack to enable or facilitate communication between a UE 120 and a core network of the wireless communication network 100.

[0039] Alternatively, and as also shown, a network node 110 may be a disaggregated network node (sometimes referred to as a disaggregated base station), meaning that the network node 110 may implement a radio protocol stack that is physically distributed and / or logically distributed among two or more nodes in the same geographic location or in different geographic locations. For example, a disaggregated network node may have a disaggregated architecture. In some deployments, disaggregated network nodes 110 may be used in an integrated access and backhaul (IAB) network, in an open radio access network (O-RAN) (such as a network configuration in compliance with the O-RAN Alliance), or in a virtualized radio access network (vRAN), also known as a cloud radio access network (C-RAN), to facilitate scaling by separating base station functionality into multiple units that can be individually deployed.

[0040] The network nodes 110 of the wireless communication network 100 may include one or more central units (CUs), one or more distributed units (DUs), and / or one or more radio units (RUs). A CU may host one or more higher layer control functions, such as radio resource control (RRC) functions, packet data convergence protocol (PDCP) functions, and / or service data adaptation protocol (SDAP) functions, among other examples. A DU may host one or more of a radio link control (RLC) layer, a medium access control (MAC) layer, and / or one or more higher physical (PHY) layers depending, at least in part, on a functional split, such as a functional split defined by the 3GPP. In some examples, a DU also may host one or more lower PHY layer functions, such as a fast Fourier transform (FFT), an inverse FFT (iFFT), beamforming, PRACH extraction and filtering, and / or scheduling of resources for one or more UEs 120, among other examples. An RU may host RF processing functions or lower PHY layer functions, such as an FFT, an iFFT, beamforming, or PRACH extraction and filtering, among0097-5744PCTother examples, according to a functional split, such as a lower layer functional split. In such an architecture, each RU can be operated to handle over the air (OTA) communication with one or more UEs 120.

[0041] In some aspects, a single network node 110 may include a combination of one or more CUs, one or more DUs, and / or one or more RUs. Additionally or alternatively, a network node 110 may include one or more Near-Real Time (Near-RT) RAN Intelligent Controllers (RICs) and / or one or more Non-Real Time (Non-RT) RICs. In some examples, a CU, a DU, and / or an RU may be implemented as a virtual unit, such as a virtual central unit (VCU), a virtual distributed unit (VDU), or a virtual radio unit (VRU), among other examples. A virtual unit may be implemented as a virtual network function, such as associated with a cloud deployment.

[0042] Some network nodes 110 (for example, a base station, an RU, or a TRP) may provide communication coverage for a particular geographic area. In the 3GPP, the term “cell” can refer to a coverage area of a network node 110 or to a network node 110 itself, depending on the context in which the term is used. A network node 110 may support one or multiple (for example, three) cells. In some examples, a network node 110 may provide communication coverage for a macro cell, a pico cell, a femto cell, or another type of cell. A macro cell may cover a relatively large geographic area (for example, several kilometers in radius) and may allow unrestricted access by UEs 120 with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs 120 with service subscriptions. A femto cell may cover a relatively small geographic area (for example, a home) and may allow restricted access by UEs 120 having association with the femto cell (for example, UEs 120 in a closed subscriber group (CSG)). A network node 110 for a macro cell may be referred to as a macro network node. A network node 110 for a pico cell may be referred to as a pico network node. A network node 110 for a femto cell may be referred to as a femto network node or an in-home network node. In some examples, a cell may not necessarily be stationary. For example, the geographic area of the cell may move according to the location of an associated mobile network node 110 (for example, a train, a satellite base station, an unmanned aerial vehicle, or an NTN network node).

[0043] The wireless communication network 100 may be a heterogeneous network that includes network nodes 110 of different types, such as macro network nodes, pico network nodes, femto network nodes, relay network nodes, aggregated network nodes, and / or disaggregated network nodes, among other examples. In the example shown in Fig. 1, the network node 110a may be a macro network node for a macro cell 130a, the network node 110b may be a pico network node for a pico cell 130b, and the network node 110c may be a femto network node for a femto cell 130c.Various different types of network nodes 110 may generally transmit at different power levels, serve different coverage areas, and / or have different impacts0097-5744PCTon interference in the wireless communication network 100 than other types of network nodes 110. For example, macro network nodes may have a high transmit power level (for example, 5 to 40 watts), whereas pico network nodes, femto network nodes, and relay network nodes may have lower transmit power levels (for example, 0. 1 to 2 watts).

[0044] In some examples, a network node 110 may be, may include, or may operate as an RU, a TRP, or a base station that communicates with one or more UEs 120 via a radio access link (which may be referred to as a “Uu” link). The radio access link may include a downlink and an uplink. “Downlink” (or “DL”) refers to a communication direction from a network node 110 to a UE 120, and “uplink” (or “UL”) refers to a communication direction from a UE 120 to a network node 110. Downlink channels may include one or more control channels and one or more data channels. A downlink control channel may be used to transmit downlink control information (DCI) (for example, scheduling information, reference signals, and / or configuration information) from a network node 110 to a UE 120. A downlink data channel may be used to transmit downlink data (for example, user data associated with a UE 120) from a network node 110 to a UE 120. Downlink control channels may include one or more physical downlink control channels (PDCCHs), and downlink data channels may include one or more physical downlink shared channels (PDSCHs). Uplink channels may similarly include one or more control channels and one or more data channels. An uplink control channel may be used to transmit uplink control information (UCI) (for example, reference signals and / or feedback corresponding to one or more downlink transmissions) from a UE 120 to a network node 110. An uplink data channel may be used to transmit uplink data (for example, user data associated with a UE 120) from a UE 120 to a network node 110. Uplink control channels may include one or more physical uplink control channels (PUCCHs), and uplink data channels may include one or more physical uplink shared channels (PUSCHs). The downlink and the uplink may each include a set of resources on which the network node 110 and the UE 120 may communicate.

[0045] Downlink and uplink resources may include time domain resources (frames, subframes, slots, and / or symbols), frequency domain resources (frequency bands, component carriers, subcarriers, resource blocks, and / or resource elements), and / or spatial domain resources (particular transmit directions and / or beam parameters). Frequency domain resources of some bands may be subdivided into bandwidth parts (BWPs). A BWP may be a continuous block of frequency domain resources (for example, a continuous block of resource blocks) that are allocated for one or more UEs 120. A UE 120 may be configured with both an uplink BWP and a downlink BWP (where the uplink BWP and the downlink BWP may be the same BWP or different BWPs). A BWP may be dynamically configured (for example, by a network node 110 transmitting a DCI configuration to the one or more UEs 120) and / or reconfigured, which means that a BWP can be adjusted in real-time (or near-real-time) based on changing network0097-5744PCTconditions in the wireless communication network 100 and / or based on the specific requirements of the one or more UEs 120. This enables more efficient use of the available frequency domain resources in the wireless communication network 100 because fewer frequency domain resources may be allocated to a BWP for a UE 120 (which may reduce the quantity of frequency domain resources that a UE 120 is required to monitor), leaving more frequency domain resources to be spread across multiple UEs 120. Thus, BWPs may also assist in the implementation of lower-capability UEs 120 by facilitating the configuration of smaller bandwidths for communication by such UEs 120.

[0046] As described above, in some aspects, the wireless communication network 100 may be, may include, or may be included in, an IAB network. In an IAB network, at least one network node 110 is an anchor network node that communicates with a core network. An anchor network node 110 may also be referred to as an IAB donor (or “lAB-donor”). The anchor network node 110 may connect to the core network via a wired backhaul link. For example, an Ng interface of the anchor network node 110 may terminate at the core network. Additionally or alternatively, an anchor network node 110 may connect to one or more devices of the core network that provide a core access and mobility management function (AMF). An IAB network also generally includes multiple non-anchor network nodes 110, which may also be referred to as relay network nodes or simply as IAB nodes (or “lAB-nodes”). Each nonanchor network node 110 may communicate directly with the anchor network node 110 via a wireless backhaul link to access the core network, or may communicate indirectly with the anchor network node 110 via one or more other non-anchor network nodes 110 and associated wireless backhaul links that form a backhaul path to the core network. Some anchor network node 110 or other non-anchor network node 110 may also communicate directly with one or more UEs 120 via wireless access links that carry access traffic. In some examples, network resources for wireless communication (such as time resources, frequency resources, and / or spatial resources) may be shared between access links and backhaul links.

[0047] In some examples, any network node 110 that relays communications may be referred to as a relay network node, a relay station, or simply as a relay. A relay may receive a transmission of a communication from an upstream station (for example, another network node 110 or a UE 120) and transmit the communication to a downstream station (for example, a UE 120 or another network node 110). In this case, the wireless communication network 100 may include or be referred to as a “multi-hop network.” In the example shown in Fig. 1, the network node 1 lOd (for example, a relay network node) may communicate with the network node 110a (for example, a macro network node) and the UE 120d in order to facilitate communication between the network node 110a and the UE 120d. Additionally or alternatively, a UE 120 may be or may operate as a relay station that can relay transmissions to or from other UEs 120. A0097-5744PCTUE 120 that relays communications may be referred to as a UE relay or a relay UE, among other examples.

[0048] The UEs 120 may be physically dispersed throughout the wireless communication network 100, and each UE 120 may be stationary or mobile. A UE 120 may be, may include, or may be included in an access terminal, another terminal, a mobile station, or a subscriber unit. A UE 120 may be, include, or be coupled with a cellular phone (for example, a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device, a biometric device, a wearable device (for example, a smart watch, smart clothing, smart glasses, a smart wristband, and / or smart jewelry, such as a smart ring or a smart bracelet), an entertainment device (for example, a music device, a video device, and / or a satellite radio), an XR device, a vehicular component or sensor, a smart meter or sensor, industrial manufacturing equipment, a Global Navigation Satellite System (GNSS) device (such as a Global Positioning System device or another type of positioning device), a UE function of a network node, and / or any other suitable device or function that may communicate via a wireless medium.

[0049] A UE 120 and / or a network node 110 may include one or more chips, system-on- chips (SoCs), chipsets, packages, or devices that individually or collectively constitute or comprise a processing system. The processing system includes processor (or “processing”) circuitry in the form of one or multiple processors, microprocessors, processing units (such as central processing units (CPUs), graphics processing units (GPUs), neural processing units (NPUs) and / or digital signal processors (DSPs)), processing blocks, application-specific integrated circuits (ASIC), programmable logic devices (PLDs) (such as field programmable gate arrays (FPGAs)), or other discrete gate or transistor logic or circuitry (all of which may be generally referred to herein individually as “processors” or collectively as “the processor” or “the processor circuitry”). One or more of the processors may be individually or collectively configurable or configured to perform various functions or operations described herein. A group of processors collectively configurable or configured to perform a set of functions may include a first processor configurable or configured to perform a first function of the set and a second processor configurable or configured to perform a second function of the set, or may include the group of processors all being configured or configurable to perform the set of functions.

[0050] The processing system may further include memory circuitry in the form of one or more memory devices, memory blocks, memory elements or other discrete gate or transistor logic or circuitry, each of which may include tangible storage media such as random-access memory (RAM) or read-only memory (ROM), or combinations thereof (all of which may be generally referred to herein individually as “memories” or collectively as “the memory” or “the0097-5744PCTmemory circuitry”). One or more of the memories may be coupled (for example, operatively coupled, communicatively coupled, electronically coupled, or electrically coupled) with one or more of the processors and may individually or collectively store processor-executable code (such as software) that, when executed by one or more of the processors, may configure one or more of the processors to perform various functions or operations described herein. Additionally or alternatively, in some examples, one or more of the processors may be preconfigured to perform various functions or operations described herein without requiring configuration by software. The processing system may further include or be coupled with one or more modems (such as a Wi-Fi (for example, Institute of Electrical and Electronics Engineers (IEEE) compliant) modem or a cellular (for example, 3GPP 4G LTE, 5G, or 6G compliant) modem). In some implementations, one or more processors of the processing system include or implement one or more of the modems. The processing system may further include or be coupled with multiple radios (collectively “the radio”), multiple RF chains, or multiple transceivers, each of which may in turn be coupled with one or more of multiple antennas. In some implementations, one or more processors of the processing system include or implement one or more of the radios, RF chains or transceivers. The UE 120 may include or may be included in a housing that houses components associated with the UE 120 including the processing system.

[0051] Some UEs 120 may be considered machine-type communication (MTC) UEs, evolved or enhanced machine-type communication (eMTC), UEs, further enhanced eMTC (feMTC) UEs, or enhanced feMTC (efeMTC) UEs, or further evolutions thereof, all of which may be simply referred to as “MTC UEs”. An MTC UE may be, may include, or may be included in or coupled with a robot, an uncrewed aerial vehicle, a remote device, a sensor, a meter, a monitor, and / or a location tag. Some UEs 120 may be considered loT devices and / or may be implemented as NB-IoT (narrowband loT) devices. An loT UE or NB-IoT device may be, may include, or may be included in or coupled with an industrial machine, an appliance, a refrigerator, a doorbell camera device, a home automation device, and / or a light fixture, among other examples. Some UEs 120 may be considered Customer Premises Equipment, which may include telecommunications devices that are installed at a customer location (such as a home or office) to enable access to a service provider's network (such as included in or in communication with the wireless communication network 100).

[0052] Some UEs 120 may be classified according to different categories in association with different complexities and / or different capabilities. UEs 120 in a first category may facilitate massive loT in the wireless communication network 100, and may offer low complexity and / or cost relative to UEs 120 in a second category. UEs 120 in a second category may include mission-critical loT devices, legacy UEs, baseline UEs, high-tier UEs, advanced UEs, fullcapability UEs, and / or premium UEs that are capable of URLLC, eMBB, and / or precise0097-5744PCTpositioning in the wireless communication network 100, among other examples. A third category of UEs 120 may have mid-tier complexity and / or capability (for example, a capability between UEs 120 of the first category and UEs 120 of the second capability). A UE 120 of the third category may be referred to as a reduced capacity UE (“RedCap UE”), a mid-tier UE, an NR-Light UE, and / or an NR-Lite UE, among other examples. RedCap UEs may bridge a gap between the capability and complexity of NB-IoT devices and / or eMTC UEs, and mission- critical loT devices and / or premium UEs. RedCap UEs may include, for example, wearable devices, loT devices, industrial sensors, and / or cameras that are associated with a limited bandwidth, power capacity, and / or transmission range, among other examples. RedCap UEs may support healthcare environments, building automation, electrical distribution, process automation, transport and logistics, and / or smart city deployments, among other examples.

[0053] In some examples, two or more UEs 120 (for example, shown as UE 120a and UE 120e) may communicate directly with one another using sidelink communications (for example, without communicating by way of a network node 110 as an intermediary). As an example, the UE 120a may directly transmit data, control information, or other signaling as a sidelink communication to the UE 120e. This is in contrast to, for example, the UE 120a first transmitting data in an UL communication to a network node 110, which then transmits the data to the UE 120e in a DL communication. In various examples, the UEs 120 may transmit and receive sidelink communications using peer-to-peer (P2P) communication protocols, device-to- device (D2D) communication protocols, vehicle-to-everything (V2X) communication protocols (which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, and / or vehicle-to-pedestrian (V2P) protocols), and / or mesh network communication protocols. In some deployments and configurations, a network node 110 may schedule and / or allocate resources for sidelink communications between UEs 120 in the wireless communication network 100. In some other deployments and configurations, a UE 120 (instead of a network node 110) may perform, or collaborate or negotiate with one or more other UEs to perform, scheduling operations, resource selection operations, and / or other operations for sidelink communications.

[0054] In various examples, some of the network nodes 110 and the UEs 120 of the wireless communication network 100 may be configured for full -duplex operation in addition to halfduplex operation. A network node 110 or a UE 120 operating in a half-duplex mode may perform only one of transmission or reception during particular time resources, such as during particular slots, symbols, or other time periods. Half-duplex operation may involve timedivision duplexing (TDD), in which DL transmissions of the network node 110 and UL transmissions of the UE 120 do not occur in the same time resources (that is, the transmissions do not overlap in time). In contrast, a network node 110 or a UE 120 operating in a full-duplex mode can transmit and receive communications concurrently (for example, in the same time0097-5744PCTresources). By operating in a full-duplex mode, network nodes 110 and / or UEs 120 may generally increase the capacity of the network and the radio access link. In some examples, full- duplex operation may involve frequency-division duplexing (FDD), in which DL transmissions of the network node 110 are performed in a first frequency band or on a first component carrier and transmissions of the UE 120 are performed in a second frequency band or on a second component carrier different than the first frequency band or the first component carrier, respectively. In some examples, full-duplex operation may be enabled for a UE 120 but not for a network node 110. For example, a UE 120 may simultaneously transmit an UL transmission to a first network node 110 and receive a DL transmission from a second network node 110 in the same time resources. In some other examples, full-duplex operation may be enabled for a network node 110 but not for a UE 120. For example, a network node 110 may simultaneously transmit a DL transmission to a first UE 120 and receive an UL transmission from a second UE 120 in the same time resources. In some other examples, full-duplex operation may be enabled for both a network node 110 and a UE 120.

[0055] In some examples, the UEs 120 and the network nodes 110 may perform MIMO communication. “MIMO” generally refers to transmitting or receiving multiple signals (such as multiple layers or multiple data streams) simultaneously over the same time and frequency resources. MIMO techniques generally exploit multipath propagation. MIMO may be implemented using various spatial processing or spatial multiplexing operations. In some examples, MIMO may support simultaneous transmission to multiple receivers, referred to as multi-user MIMO (MU-MIMO). Some RATs may employ advanced MIMO techniques, such as mTRP operation (including redundant transmission or reception on multiple TRPs), reciprocity in the time domain or the frequency domain, single-frequency-network (SFN) transmission, or non-coherent joint transmission (NC-JT).

[0056] In some aspects, the UE 120 may include a communication manager 140. As described in more detail elsewhere herein, the communication manager 140 may transmit, in an SSB beam direction, at least one preamble in an RO associated with multiple SSBs; and monitor, in the SSB beam direction, at least one search space for an RAR associated with the at least one preamble. Additionally, or alternatively, the communication manager 140 may perform one or more other operations described herein.

[0057] In some aspects, the network node 110 may include a communication manager 150. As described in more detail elsewhere herein, the communication manager 150 may receive, in an RO associated with multiple SSBs, a first preamble via a first SSB receive beam and a second preamble via a second SSB receive beam; transmit , in a search space, a first RAR indicating the first preamble and a first SSB index associated with the first SSB receive beam; and transmit , in the search space, a second RAR indicating the second preamble and a second0097-5744PCTSSB index associated with the second SSB receive beam. Additionally, or alternatively, the communication manager 150 may perform one or more other operations described herein.

[0058] As indicated above, Fig. 1 is provided as an example. Other examples may differ from what is described with regard to Fig. 1.

[0059] Fig. 2 is a diagram illustrating an example network node 110 in communication with an example UE 120 in a wireless network, in accordance with the present disclosure.

[0060] As shown in Fig. 2, the network node 110 may include a data source 212, a transmit processor 214, a transmit (TX) MIMO processor 216, a set of modems 232 (shown as 232a through 232t, where t > 1), a set of antennas 234 (shown as 234a through 234v, where v > 1), a MIMO detector 236, a receive processor 238, a data sink 239, a controller / processor 240, a memory 242, a communication unit 244, a scheduler 246, and / or a communication manager 150, among other examples. In some configurations, one or a combination of the antenna(s) 234, the modem(s) 232, the MIMO detector 236, the receive processor 238, the transmit processor 214, and / or the TX MIMO processor 216 may be included in atransceiver of the network node 110. The transceiver may be under control of and used by one or more processors, such as the controller / processor 240, and in some aspects in conjunction with processor-readable code stored in the memory 242, to perform aspects of the methods, processes, and / or operations described herein. In some aspects, the network node 110 may include one or more interfaces, communication components, and / or other components that facilitate communication with the UE 120 or another network node.

[0061] The terms “processor,” “controller,” or “controller / processor” may refer to one or more controllers and / or one or more processors. For example, reference to “a / the processor,” “a / the controller / processor,” or the like (in the singular) should be understood to refer to any one or more of the processors described in connection with Fig. 2, such as a single processor or a combination of multiple different processors. Reference to “one or more processors” should be understood to refer to any one or more of the processors described in connection with Fig. 2. For example, one or more processors of the network node 110 may include transmit processor 214, TX MIMO processor 216, MIMO detector 236, receive processor 238, and / or controller / processor 240. Similarly, one or more processors of the UE 120 may include MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, and / or controller / processor 280.

[0062] In some aspects, a single processor may perform all of the operations described as being performed by the one or more processors. In some aspects, a first set of (one or more) processors of the one or more processors may perform a first operation described as being performed by the one or more processors, and a second set of (one or more) processors of the one or more processors may perform a second operation described as being performed by the0097-5744PCTone or more processors. The first set of processors and the second set of processors may be the same set of processors or may be different sets of processors. Reference to “one or more memories” should be understood to refer to any one or more memories of a corresponding device, such as the memory described in connection with Fig. 2. For example, operation described as being performed by one or more memories can be performed by the same subset of the one or more memories or different subsets of the one or more memories.

[0063] For downlink communication from the network node 110 to the UE 120, the transmit processor 214 may receive data (“downlink data”) intended for the UE 120 (or a set of UEs that includes the UE 120) from the data source 212 (such as a data pipeline or a data queue). In some examples, the transmit processor 214 may select one or more modulation and coding schemes (MCSs) for the UE 120 in accordance with one or more channel quality indicators (CQIs) received from the UE 120. The network node 110 may process the data (for example, including encoding the data) for transmission to the UE 120 on a downlink in accordance with the MCS(s) selected for the UE 120 to generate data symbols. The transmit processor 214 may process system information (for example, semi-static resource partitioning information (SRPI)) and / or control information (for example, CQI requests, grants, and / or upper layer signaling) and provide overhead symbols and / or control symbols. The transmit processor 214 may generate reference symbols for reference signals (for example, a cell-specific reference signal (CRS), a demodulation reference signal (DMRS), or a channel state information (CSI) reference signal (CSI-RS)) and / or synchronization signals (for example, a primary synchronization signal (PSS) or a secondary synchronization signals (SSS)).

[0064] The TX MIMO processor 216 may perform spatial processing (for example, precoding) on the data symbols, the control symbols, the overhead symbols, and / or the reference symbols, if applicable, and may provide a set of output symbol streams (for example, T output symbol streams) to the set of modems 232. For example, each output symbol stream may be provided to a respective modulator component (shown as MOD) of a modem 232. Each modem 232 may use the respective modulator component to process (for example, to modulate) a respective output symbol stream (for example, for orthogonal frequency division multiplexing (OFDM)) to obtain an output sample stream. Each modem 232 may further use the respective modulator component to process (for example, convert to analog, amplify, filter, and / or upconvert) the output sample stream to obtain a time domain downlink signal. The modems 232a through 232t may together transmit a set of downlink signals (for example, T downlink signals) via the corresponding set of antennas 234.

[0065] A downlink signal may include a DCI communication, a MAC control element (MAC-CE) communication, an RRC communication, a downlink reference signal, or another type of downlink communication. Downlink signals may be transmitted on a PDCCH, a PDSCH, and / or on another downlink channel. A downlink signal may carry one or more0097-5744PCTtransport blocks (TBs) of data. A TB may be a unit of data that is transmitted over an air interface in the wireless communication network 100. A data stream (for example, from the data source 212) may be encoded into multiple TBs for transmission over the air interface. The quantity of TBs used to carry the data associated with a particular data stream may be associated with a TB size common to the multiple TBs. The TB size may be based on or otherwise associated with radio channel conditions of the air interface, the MCS used for encoding the data, the downlink resources allocated for transmitting the data, and / or another parameter. In general, the larger the TB size, the greater the amount of data that can be transmitted in a single transmission, which reduces signaling overhead. However, larger TB sizes may be more prone to transmission and / or reception errors than smaller TB sizes, but such errors may be mitigated by more robust error correction techniques.

[0066] For uplink communication from the UE 120 to the network node 110, uplink signals from the UE 120 may be received by an antenna 234, may be processed by a modem 232 (for example, a demodulator component, shown as DEMOD, of a modem 232), may be detected by the MIMO detector 236 (for example, a receive (Rx) MIMO processor) if applicable, and / or may be further processed by the receive processor 238 to obtain decoded data and / or control information. The receive processor 238 may provide the decoded data to a data sink 239 (which may be a data pipeline, a data queue, and / or another type of data sink) and provide the decoded control information to a processor, such as the controller / processor 240.

[0067] The network node 110 may use the scheduler 246 to schedule one or more UEs 120 for downlink or uplink communications. In some aspects, the scheduler 246 may use DCI to dynamically schedule DL transmissions to the UE 120 and / or UL transmissions from the UE 120. In some examples, the scheduler 246 may allocate recurring time domain resources and / or frequency domain resources that the UE 120 may use to transmit and / or receive communications using an RRC configuration (for example, a semi-static configuration), for example, to perform semi-persistent scheduling (SPS) or to configure a configured grant (CG) for the UE 120.

[0068] One or more of the transmit processor 214, the TX MIMO processor 216, the modem 232, the antenna 234, the MIMO detector 236, the receive processor 238, and / or the controller / processor 240 may be included in an RF chain of the network node 110. An RF chain may include one or more filters, mixers, oscillators, amplifiers, analog-to-digital converters (ADCs), and / or other devices that convert between an analog signal (such as for transmission or reception via an air interface) and a digital signal (such as for processing by one or more processors of the network node 110). In some aspects, the RF chain may be or may be included in a transceiver of the network node 110.

[0069] In some examples, the network node 110 may use the communication unit 244 to communicate with a core network and / or with other network nodes. The communication unit0097-5744PCT244 may support wired and / or wireless communication protocols and / or connections, such as Ethernet, optical fiber, common public radio interface (CPRI), and / or a wired or wireless backhaul, among other examples. The network node 110 may use the communication unit 244 to transmit and / or receive data associated with the UE 120 or to perform network control signaling, among other examples. The communication unit 244 may include a transceiver and / or an interface, such as a network interface.

[0070] The UE 120 may include a set of antennas 252 (shown as antennas 252a through 252r, where r > 1), a set of modems 254 (shown as modems 254a through 254u, where u > 1), a MIMO detector 256, a receive processor 258, a data sink 260, a data source 262, a transmit processor 264, a TX MIMO processor 266, a controller / processor 280, a memory 282, and / or a communication manager 140, among other examples. One or more of the components of the UE 120 may be included in a housing 284. In some aspects, one or a combination of the antenna(s) 252, the modem(s) 254, the MIMO detector 256, the receive processor 258, the transmit processor 264, or the TX MIMO processor 266 may be included in a transceiver that is included in the UE 120. The transceiver may be under control of and used by one or more processors, such as the controller / processor 280, and in some aspects in conjunction with processor-readable code stored in the memory 282, to perform aspects of the methods, processes, or operations described herein. In some aspects, the UE 120 may include another interface, another communication component, and / or another component that facilitates communication with the network node 110 and / or another UE 120.

[0071] For downlink communication from the network node 110 to the UE 120, the set of antennas 252 may receive the downlink communications or signals from the network node 110 and may provide a set of received downlink signals (for example, R received signals) to the set of modems 254. For example, each received signal may be provided to a respective demodulator component (shown as DEMOD) of a modem 254. Each modem 254 may use the respective demodulator component to condition (for example, filter, amplify, downconvert, and / or digitize) a received signal to obtain input samples. Each modem 254 may use the respective demodulator component to further demodulate or process the input samples (for example, for OFDM) to obtain received symbols. The MIMO detector 256 may obtain received symbols from the set of modems 254, may perform MIMO detection on the received symbols if applicable, and may provide detected symbols. The receive processor 258 may process (for example, decode) the detected symbols, may provide decoded data for the UE 120 to the data sink 260 (which may include a data pipeline, a data queue, and / or an application executed on the UE 120), and may provide decoded control information and system information to the controller / processor 280.

[0072] For uplink communication from the UE 120 to the network node 110, the transmit processor 264 may receive and process data (“uplink data”) from a data source 262 (such as a0097-5744PCTdata pipeline, a data queue, and / or an application executed on the UE 120) and control information from the controller / processor 280. The control information may include one or more parameters, feedback, one or more signal measurements, and / or other types of control information. In some aspects, the receive processor 258 and / or the controller / processor 280 may determine, for a received signal (such as received from the network node 110 or another UE), one or more parameters relating to transmission of the uplink communication. The one or more parameters may include a reference signal received power (RSRP) parameter, a received signal strength indicator (RS SI) parameter, a reference signal received quality (RSRQ) parameter, a CQI parameter, or a transmit power control (TPC) parameter, among other examples. The control information may include an indication of the RSRP parameter, the RS SI parameter, the RSRQ parameter, the CQI parameter, the TPC parameter, and / or another parameter. The control information may facilitate parameter selection and / or scheduling for the UE 120 by the network node 110.

[0073] The transmit processor 264 may generate reference symbols for one or more reference signals, such as an uplink DMRS, an uplink sounding reference signal (SRS), and / or another type of reference signal. The symbols from the transmit processor 264 may be precoded by the TX MIMO processor 266, if applicable, and further processed by the set of modems 254 (for example, for DFT-s-OFDM or CP-OFDM). The TX MIMO processor 266 may perform spatial processing (for example, precoding) on the data symbols, the control symbols, the overhead symbols, and / or the reference symbols, if applicable, and may provide a set of output symbol streams (for example, U output symbol streams) to the set of modems 254. For example, each output symbol stream may be provided to a respective modulator component (shown as MOD) of a modem 254. Each modem 254 may use the respective modulator component to process (for example, to modulate) a respective output symbol stream (for example, for OFDM) to obtain an output sample stream. Each modem 254 may further use the respective modulator component to process (for example, convert to analog, amplify, fdter, and / or upconvert) the output sample stream to obtain an uplink signal.

[0074] The modems 254a through 254u may transmit a set of uplink signals (for example, R uplink signals or U uplink symbols) via the corresponding set of antennas 252. An uplink signal may include a UCI communication, a MAC-CE communication, an RRC communication, or another type of uplink communication. Uplink signals may be transmitted on a PUSCH, a PUCCH, and / or another type of uplink channel. An uplink signal may carry one or more TBs of data. Sidelink data and control transmissions (that is, transmissions directly between two or more UEs 120) may generally use similar techniques as were described for uplink data and control transmission, and may use sidelink-specific channels such as a physical sidelink shared channel (PSSCH), a physical sidelink control channel (PSCCH), and / or a physical sidelink feedback channel (PSFCH).0097-5744PCT

[0075] One or more antennas of the set of antennas 252 or the set of antennas 234 may include, or may be included within, one or more antenna panels, one or more antenna groups, one or more sets of antenna elements, or one or more antenna arrays, among other examples. An antenna panel, an antenna group, a set of antenna elements, or an antenna array may include one or more antenna elements (within a single housing or multiple housings), a set of coplanar antenna elements, a set of non-coplanar antenna elements, or one or more antenna elements coupled with one or more transmission or reception components, such as one or more components of Fig. 2. As used herein, “antenna” can refer to one or more antennas, one or more antenna panels, one or more antenna groups, one or more sets of antenna elements, or one or more antenna arrays. “Antenna panel” can refer to a group of antennas (such as antenna elements) arranged in an array or panel, which may facilitate beamforming by manipulating parameters of the group of antennas. “Antenna module” may refer to circuitry including one or more antennas, which may also include one or more other components (such as filters, amplifiers, or processors) associated with integrating the antenna module into a wireless communication device.

[0076] In some examples, each of the antenna elements of an antenna 234 or an antenna 252 may include one or more sub-elements for radiating or receiving radio frequency signals. For example, a single antenna element may include a first sub-element cross-polarized with a second sub-element that can be used to independently transmit cross-polarized signals. The antenna elements may include patch antennas, dipole antennas, and / or other types of antennas arranged in a linear pattern, a two-dimensional pattern, or another pattern. A spacing between antenna elements may be such that signals with a desired wavelength transmitted separately by the antenna elements may interact or interfere constructively and destructively along various directions (such as to form a desired beam). For example, given an expected range of wavelengths or frequencies, the spacing may provide a quarter wavelength, a half wavelength, or another fraction of a wavelength of spacing between neighboring antenna elements to allow for the desired constructive and destructive interference patterns of signals transmitted by the separate antenna elements within that expected range.

[0077] The amplitudes and / or phases of signals transmitted via antenna elements and / or subelements may be modulated and shifted relative to each other (such as by manipulating phase shift, phase offset, and / or amplitude) to generate one or more beams, which is referred to as beamforming. The term “beam” may refer to a directional transmission of a wireless signal toward a receiving device or otherwise in a desired direction. “Beam” may also generally refer to a direction associated with such a directional signal transmission, a set of directional resources associated with the signal transmission (for example, an angle of arrival, a horizontal direction, and / or a vertical direction), and / or a set of parameters that indicate one or more aspects of a directional signal, a direction associated with the signal, and / or a set of directional0097-5744PCTresources associated with the signal. In some implementations, antenna elements may be individually selected or deselected for directional transmission of a signal (or signals) by controlling amplitudes of one or more corresponding amplifiers and / or phases of the signal(s) to form one or more beams. The shape of a beam (such as the amplitude, width, and / or presence of side lobes) and / or the direction of a beam (such as an angle of the beam relative to a surface of an antenna array) can be dynamically controlled by modifying the phase shifts, phase offsets, and / or amplitudes of the multiple signals relative to each other.

[0078] Different UEs 120 or network nodes 110 may include different numbers of antenna elements. For example, a UE 120 may include a single antenna element, two antenna elements, four antenna elements, eight antenna elements, or a different number of antenna elements. As another example, a network node 110 may include eight antenna elements, 24 antenna elements, 64 antenna elements, 128 antenna elements, or a different number of antenna elements. Generally, a larger number of antenna elements may provide increased control over parameters for beam generation relative to a smaller number of antenna elements, whereas a smaller number of antenna elements may be less complex to implement and may use less power than a larger number of antenna elements. Multiple antenna elements may support multiple-layer transmission, in which a first layer of a communication (which may include a first data stream) and a second layer of a communication (which may include a second data stream) are transmitted using the same time and frequency resources with spatial multiplexing.

[0079] While blocks in Fig. 2 are illustrated as distinct components, the functions described above with respect to the blocks may be implemented in a single hardware, software, or combination component or in various combinations of components. For example, the functions described with respect to the transmit processor 264, the receive processor 258, and / or the TX MIMO processor 266 may be performed by or under the control of the controller / processor 280.

[0080] Fig. 3 is a diagram illustrating an example disaggregated base station architecture 300, in accordance with the present disclosure. One or more components of the example disaggregated base station architecture 300 may be, may include, or may be included in one or more network nodes (such one or more network nodes 110). The disaggregated base station architecture 300 may include a CU 310 that can communicate directly with a core network 320 via a backhaul link, or that can communicate indirectly with the core network 320 via one or more disaggregated control units, such as a Non-RT RIC 350 associated with a Service Management and Orchestration (SMO) Framework 360 and / or a Near-RT RIC 370 (for example, via an E2 link). The CU 310 may communicate with one or more DUs 330 via respective midhaul links, such as via Fl interfaces. Each of the DUs 330 may communicate with one or more RUs 340 via respective fronthaul links. Each of the RUs 340 may communicate with one or more UEs 120 via respective RF access links. In some deployments, a UE 120 may be simultaneously served by multiple RUs 340.0097-5744PCT

[0081] Each of the components of the disaggregated base station architecture 300, including the CUs 310, the DUs 330, the RUs 340, the Near-RT RICs 370, the Non-RT RICs 350, and the SMO Framework 360, may include one or more interfaces or may be coupled with one or more interfaces for receiving or transmitting signals, such as data or information, via a wired or wireless transmission medium.

[0082] In some aspects, the CU 310 may be logically split into one or more CU user plane (CU-UP) units and one or more CU control plane (CU-CP) units. A CU-UP unit may communicate bidirectionally with a CU-CP unit via an interface, such as the El interface when implemented in an O-RAN configuration. The CU 310 may be deployed to communicate with one or more DUs 330, as necessary, for network control and signaling. Each DU 330 may correspond to a logical unit that includes one or more base station functions to control the operation of one or more RUs 340. For example, a DU 330 may host various layers, such as an RLC layer, a MAC layer, or one or more PHY layers, such as one or more high PHY layers or one or more low PHY layers. Each layer (which also may be referred to as a module) may be implemented with an interface for communicating signals with other layers (and modules) hosted by the DU 330, or for communicating signals with the control functions hosted by the CU 310. Each RU 340 may implement lower layer functionality. In some aspects, real-time and non-real-time aspects of control and user plane communication with the RU(s) 340 may be controlled by the corresponding DU 330.

[0083] The SMO Framework 360 may support RAN deployment and provisioning of nonvirtualized and virtualized network elements. For non-virtualized network elements, the SMO Framework 360 may support the deployment of dedicated physical resources for RAN coverage requirements, which may be managed via an operations and maintenance interface, such as an 01 interface. For virtualized network elements, the SMO Framework 360 may interact with a cloud computing platform (such as an open cloud (O-Cloud) platform 390) to perform network element life cycle management (such as to instantiate virtualized network elements) via a cloud computing platform interface, such as an 02 interface. A virtualized network element may include, but is not limited to, a CU 310, a DU 330, an RU 340, a non-RT RIC 350, and / or a Near-RT RIC 370. In some aspects, the SMO Framework 360 may communicate with a hardware aspect of a 4G RAN, a 5G NR RAN, and / or a 6G RAN, such as an open eNB (O- eNB) 380, via an 01 interface. Additionally or alternatively, the SMO Framework 360 may communicate directly with each of one or more RUs 340 via a respective 01 interface. In some deployments, this configuration can enable each DU 330 and the CU 310 to be implemented in a cloud-based RAN architecture, such as a vRAN architecture.

[0084] The Non-RT RIC 350 may include or may implement a logical function that enables non-real-time control and optimization of RAN elements and resources, AI / ML workflows including model training and updates, and / or policy-based guidance of applications and / or0097-5744PCTfeatures in the Near-RT RIC 370. The Non-RT RIC 350 may be coupled to or may communicate with (such as via an Al interface) the Near-RT RIC 370. The Near-RT RIC 370 may include or may implement a logical function that enables near-real-time control and optimization of RAN elements and resources via data collection and actions via an interface (such as via an E2 interface) connecting one or more CUs 310, one or more DUs 330, and / or an O-eNB with the Near-RT RIC 370.

[0085] In some aspects, to generate AI / ML models to be deployed in the Near-RT RIC 370, the Non-RT RIC 350 may receive parameters or external enrichment information from external servers. Such information may be utilized by the Near-RT RIC 370 and may be received at the SMO Framework 360 or the Non-RT RIC 350 from non -network data sources or from network functions. In some examples, the Non-RT RIC 350 or the Near-RT RIC 370 may tune RAN behavior or performance. For example, the Non-RT RIC 350 may monitor long-term trends and patterns for performance and may employ AI / ML models to perform corrective actions via the SMO Framework 360 (such as reconfiguration via an 01 interface) or via creation of RAN management policies (such as Al interface policies).

[0086] The network node 110, the controller / processor 240 of the network node 110, the UE 120, the controller / processor 280 of the UE 120, the CU 310, the DU 330, the RU 340, or any other component s) of Figs. 1, 2, or 3 may implement one or more techniques or perform one or more operations associated with enhanced random access for multiple SSBs per RO, as described in more detail elsewhere herein. For example, the controller / processor 240 of the network node 110, the controller / processor 280 of the UE 120, any other component(s) of Fig.2, the CU 310, the DU 330, or the RU 340 may perform or direct operations of, for example, process 900 of Fig. 9, process 1000 of Fig. 10, or other processes as described herein (alone or in conjunction with one or more other processors). The memory 242 may store data and program codes for the network node 110, the network node 110, the CU 310, the DU 330, or the RU 340. The memory 282 may store data and program codes for the UE 120. In some examples, the memory 242 or the memory 282 may include a non-transitory computer-readable medium storing a set of instructions (for example, code or program code) for wireless communication. The memory 242 may include one or more memories, such as a single memory or multiple different memories (of the same type or of different types). The memory 282 may include one or more memories, such as a single memory or multiple different memories (of the same type or of different types). For example, the set of instructions, when executed (for example, directly, or after compiling, converting, or interpreting) by one or more processors of the network node 110, the UE 120, the CU 310, the DU 330, or the RU 340, may cause the one or more processors to perform process 900 of Fig. 9, process 1000 of Fig. 10, or other processes as described herein. In some examples, executing instructions may include running the0097-5744PCTinstructions, converting the instructions, compiling the instructions, and / or interpreting the instructions, among other examples.

[0087] In some aspects, the UE 120 includes means for transmitting, in an SSB beam direction, at least one preamble in an RO associated with multiple SSBs; and / or means for monitoring, in the SSB beam direction, at least one search space for an RAR associated with the at least one preamble. The means for the UE 120 to perform operations described herein may include, for example, one or more of communication manager 140, antenna 252, modem 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, controller / processor 280, or memory 282.

[0088] In some aspects, the network node 110 includes means for receiving, in an RO associated with multiple SSBs, a first preamble via a first SSB receive beam and a second preamble via a second SSB receive beam; means for transmitting, in a search space, a first RAR indicating the first preamble and a first SSB index associated with the first SSB receive beam; and / or means for transmitting, in the search space, a second RAR indicating the second preamble and a second SSB index associated with the second SSB receive beam. The means for the network node 110 to perform operations described herein may include, for example, one or more of communication manager 150, transmit processor 214, TX MIMO processor 216, modem 232, antenna 234, MIMO detector 236, receive processor 238, controller / processor 240, memory 242, or scheduler 246.

[0089] As indicated above, Fig. 3 is provided as an example. Other examples may differ from what is described with regard to Fig. 3.

[0090] Fig. 4 is a diagram illustrating an example 400 of a synchronization signal (SS) hierarchy, in accordance with the present disclosure. As shown in Fig. 4, the SS hierarchy may include an SS burst set 405, which may include multiple SS bursts 410, shown as SS burst 0 through SS burst A-l, where Xis a maximum number of repetitions of the SS burst 410 that may be transmitted by one or more network nodes. As further shown, each SS burst 410 may include one or more SSBs 415, shown as SSB 0 through SSB A -1, where M is a maximum number of SSBs 415 that can be carried by an SS burst 410. In some aspects, different SSBs 415 may be beam-formed differently (e.g., transmitted using different beams), and may be used for cell search, cell acquisition, beam management, and / or beam selection (e.g., as part of an initial network access procedure, such as a random access procedure). An SS burst set 405 may be periodically transmitted by a wireless node (e.g., a network node 110), such as every X milliseconds (ms), as shown in Fig. 4. In some aspects, an SS burst set 405 may have a fixed or dynamic length, shown as Y ms in Fig. 4. In some cases, an SS burst set 405 or an SS burst 410 may be referred to as a discovery reference signal (DRS) transmission window or an SSB measurement time configuration (SMTC) window.0097-5744PCT

[0091] In some aspects, an SSB 415 may include resources that carry a PSS 420, an SSS 425, and / or a physical broadcast channel (PBCH) 430. In some aspects, multiple SSBs 415 are included in an SS burst 410 (e.g., with transmission on different beams), and the PSS 420, the SSS 425, and / or the PBCH 430 may be the same across each SSB 415 of the SS burst 410. In some aspects, a single SSB 415 may be included in an SS burst 410. In some aspects, the SSB 415 may be at least four symbols (e.g., OFDM symbols) in length, where each symbol carries one or more of the PSS 420 (e.g., occupying one symbol), the SSS 425 (e.g., occupying one symbol), and / or the PBCH 430 (e.g., occupying two symbols). In some aspects, an SSB 415 may be referred to as an SS / PBCH block.

[0092] In some aspects, the symbols of an SSB 415 are consecutive, as shown in Fig. 4. In some aspects, the symbols of an SSB 415 are non-consecutive. Similarly, in some aspects, one or more SSBs 415 of the SS burst 410 may be transmitted in consecutive radio resources (e.g., consecutive symbols) during one or more slots. Additionally, or alternatively, one or more SSBs 415 of the SS burst 410 may be transmitted in non-consecutive radio resources.

[0093] In some aspects, the SS bursts 410 may have a burst period, and the SSBs 415 of the SS burst 410 may be transmitted by a wireless node (e.g., a network node 110) according to the burst period. In this case, the SSBs 415 may be repeated during each SS burst 410. In some aspects, the SS burst set 405 may have a burst set periodicity, whereby the SS bursts 410 of the SS burst set 405 are transmitted by the wireless node according to the fixed burst set periodicity. In other words, the SS bursts 410 may be repeated during each SS burst set 405.

[0094] In some aspects, an SSB 415 may include an SSB index, which may correspond to a beam used to carry the SSB 415. A UE 120 may monitor for and / or measure SSBs 415 using different Rx beams during an initial network access procedure and / or a cell search procedure, among other examples. Based at least in part on the monitoring and / or measuring, the UE 120 may indicate one or more SSBs 415 with a best signal parameter (e.g., an RSRP parameter) to a network node 110 (e.g., directly or via one or more other network nodes). The network node 110 and the UE 120 may use the one or more indicated SSBs 415 to select one or more beams to be used for communication between the network node 110 and the UE 120 (e.g., for a RACH procedure). Additionally, or alternatively, the UE 120 may use the SSB 415 and / or the SSB index to determine a cell timing for a cell via which the SSB 415 is received (e.g., a serving cell).

[0095] As indicated above, Fig. 4 is provided as an example. Other examples may differ from what is described with regard to Fig. 4.

[0096] Fig. 5 is a diagram illustrating an example 500 of a four-step random access procedure, in accordance with the present disclosure. As shown in Fig. 5, a network node 1100097-5744PCTand a UE 120 may communicate with one another to perform the four-step random access procedure.

[0097] As shown by reference number 505, the network node 110 may transmit, and the UE 120 may receive, one or more SSBs and random access configuration information. In some aspects, the random access configuration information may be transmitted in and / or indicated by system information (e.g., in one or more system information blocks (SIBs)) and / or an SSB, such as for contention-based random access. Additionally, or alternatively, the random access configuration information may be transmitted in an RRC message and / or a PDCCH order message that triggers a RACH procedure, such as for contention-free random access. The random access configuration information may include one or more parameters to be used in the random access procedure, such as one or more parameters for transmitting a RAM and / or one or more parameters for receiving an RAR responsive to the RAM (e.g., a PRACH configuration index that corresponds to a specific PRACH period, frequency and time resources associated with one or more ROs, a number of SSBs per RO and contention-based preambles per SSB, and / or a duration for an RAR response window, and / or among other examples).

[0098] As shown by reference number 510, the UE 120 may transmit a RAM, which may include a preamble (sometimes referred to as a random access preamble, a PRACH preamble, or a RAM preamble). The message that includes the preamble may be referred to as a message 1, msgl, MSG1, a first message, or an initial message in a four-step random access procedure. The random access message may include a RAPID.

[0099] As shown by reference number 515, the network node 110 may transmit an RAR as a reply to the preamble. The message that includes the RAR may be referred to as message 2, msg2, MSG2, or a second message in a four-step random access procedure. In some aspects, the RAR may indicate the detected RAPID (e.g., received from the UE 120 in msgl). Additionally, or alternatively, the RAR may indicate a resource allocation to be used by the UE 120 to transmit message 3 (msg3).

[0100] In some aspects, as part of the second step of the four-step random access procedure, the network node 110 may transmit a PDCCH communication for the RAR. The PDCCH communication may schedule a PDSCH communication that includes the RAR. For example, the PDCCH communication may indicate a resource allocation for the PDSCH communication. Also as part of the second step of the four-step random access procedure, the network node 110 may transmit the PDSCH communication for the RAR, as scheduled by the PDCCH communication. The RAR may be included in a MAC protocol data unit (PDU) of the PDSCH communication.

[0101] As shown by reference number 520, the UE 120 may transmit an RRC connection request message. The RRC connection request message may be referred to as message 3, msg3,0097-5744PCTMSG3, or a third message of a four-step random access procedure. In some aspects, the RRC connection request may include a UE identifier, UCI, and / or a PUSCH communication (e.g., an RRC connection request).

[0102] As shown by reference number 525, the network node 110 may transmit an RRC connection setup message. The RRC connection setup message may be referred to as message 4, msg4, MSG4, or a fourth message of a four-step random access procedure. In some aspects, the RRC connection setup message may include the detected UE identifier, a timing advance value, and / or contention resolution information. As shown by reference number 530, if the UE 120 successfully receives the RRC connection setup message, the UE 120 may transmit a hybrid automatic repeat request (HARQ) acknowledgement (ACK).

[0103] As indicated above, Fig. 5 is provided as an example. Other examples may differ from what is described with regard to Fig. 5.

[0104] Fig. 6 is a diagram illustrating an example 600 of a two-step random access procedure, in accordance with the present disclosure. As shown in Fig. 6, a network node 110 and a UE 120 may communicate with one another to perform the two-step random access procedure.

[0105] As shown by reference number 605, the network node 110 may transmit, and the UE 120 may receive, one or more SSBs and random access configuration information. In some aspects, the random access configuration information may be transmitted in and / or indicated by system information (e.g., in one or more SIBs) and / or an SSB, such as for contention-based random access. Additionally, or alternatively, the random access configuration information may be transmitted in an RRC message and / or a PDCCH order message that triggers a RACH procedure, such as for contention-free random access. The random access configuration information may include one or more parameters to be used in the two-step random access procedure, such as one or more parameters for transmitting a RAM and / or receiving an RAR responsive to the RAM (e.g., a PRACH configuration index that corresponds to a specific PRACH period, frequency and time resources associated with one or more ROs, a number of SSBs per RO and contention-based preambles per SSB, and / or a duration for an RAR response window, and / or among other examples).

[0106] As shown by reference number 610, the UE 120 may transmit, and the network node 110 may receive, a RAM preamble. As shown by reference number 615, the UE 120 may transmit, and the network node 110 may receive, a RAM payload. As shown, the UE 120 may transmit the RAM preamble and the RAM payload to the network node 110 as part of an initial (or first) step of the two-step random access procedure. In some aspects, the RAM may be referred to as message A, msgA, a first message, or an initial message in a two-step random access procedure. Furthermore, in some aspects, the RAM preamble may be referred to as a0097-5744PCTmessage A preamble, a msgA preamble, a preamble, or a PRACH preamble, and the RAM payload may be referred to as a message A payload, a msgA payload, or a payload. In some aspects, the RAM may include some or all of the contents of message 1 (msgl) and message 3 (msg3) of a four-step random access procedure, which is described in more detail below. For example, the RAM preamble may include some or all contents of message 1 (e.g., a PRACH preamble), and the RAM payload may include some or all contents of message 3 (e.g., a UE identifier, UCI, and / or a PUSCH transmission).

[0107] As shown by reference number 620, the network node 110 may receive the RAM preamble transmitted by the UE 120. If the network node 110 successfully receives and decodes the RAM preamble, the network node 110 may then receive and decode the RAM payload.

[0108] As shown by reference number 625, the network node 110 may transmit an RAR (sometimes referred to as an RAR message). As shown, the network node 110 may transmit the RAR message as part of a second step of the two-step random access procedure. In some aspects, the RAR message may be referred to as message B, msgB, or a second message in a two-step random access procedure. The RAR message may include some or all of the contents of message 2 (msg2) and message 4 (msg4) of a four-step random access procedure. For example, the RAR message may include the detected RAPID, the detected UE identifier, a timing advance value, and / or contention resolution information.

[0109] As shown by reference number 630, as part of the second step of the two-step random access procedure, the network node 110 may transmit a PDCCH communication for the RAR. The PDCCH communication may schedule a PDSCH communication that includes the RAR. For example, the PDCCH communication may indicate a resource allocation (e.g., in DCI) for the PDSCH communication.

[0110] As shown by reference number 635, as part of the second step of the two-step random access procedure, the network node 110 may transmit the PDSCH communication for the RAR, as scheduled by the PDCCH communication. The RAR may be included in a MAC PDU of the PDSCH communication. As shown by reference number 640, if the UE 120 successfully receives the RAR, the UE 120 may transmit a HARQ ACK.[OHl] As indicated above, Fig. 6 is provided as an example. Other examples may differ from what is described with regard to Fig. 6.

[0112] Figs. 7A-7B are diagrams illustrating examples 700 of an SSB-RO mapping, in accordance with the present disclosure. More particularly, as described herein, a PRACH occasion, also known as a RACH occasion, a random access occasion, or an RO, generally includes time resources and frequency resources that a UE 120 can use to transmit a PRACH preamble to initiate a RACH procedure. Furthermore, a network node 110 may generally0097-5744PCTtransmit an SSB using different directional beams, and the UE 120 may select a certain beam (e.g., corresponding to an SSB beam direction) to use when transmitting the PRACH preamble. Accordingly, to enable the UE 120 to select an RO and to enable the network node 110 to determine which beam the UE 120 selected to transmit the PRACH preamble, an SSB-RO mapping may be defined to associate each RO with one or more SSBs. For example, a RACH configuration may include a parameter (e.g., ssb-perRACH-OccasionAndCB-PreamblesPerSSB) indicating that A consecutive SSBs indexes are associated with one RO. Furthermore, the UE 120 may receive an indication of one or more SSB indexes in an ssb-PositionsInBurst parameter (e.g., indicated in SIB1 and / or a ServingCellConfigCommon parameter) that are mapped to valid ROs. For example, the SSB indexes indicated in the ssb-PositionsInBurst parameter are mapped to valid ROs first in an increasing order of preamble indexes within a single RO, second in an increasing order of frequency resource indexes for frequency multiplexed ROs, third in an increasing order of time resource indexes for time multiplexed ROs within a PRACH slot, and fourth in an increasing order of indexes for PRACH slots. In this way, when a PRACH transmission is triggered at the UE 120 (e.g., by a PDCCH order, for initial access from an RRC idle mode, for a handover, or the like), the UE 120 may transmit a PRACH preamble in a valid RO that is mapped to an SSB index selected by the UE 120.

[0113] For example, Fig. 7A illustrates an example configuration 710 where a network node 110 transmits an SSB using different SSBs beams that are each associated with an SSB index, and a single SSB index is configured per RO. As shown by reference number 712, a UE 120 may select, among the multiple SSB beams that the network node 110 uses to transmit the SSB, an SSB index associated with a beam for a PRACH transmission. For example, the SSB index selected by the UE 120 may be indicated in a PDCCH order triggering the PRACH preamble transmission and / or may be selected by the UE 120 (e.g., an SSB index associated with a highest RSRP measurement). As further shown by reference number 714, the UE 120 may then determine an SSB-RO mapping to identify one or more candidate ROs in which to transmit the PRACH preamble. For example, in Fig. 7A, the network node 110 transmits the SSB using 8 SSB beams, associated with SSB indexes 0-7. Accordingly, there is a single SSB per RO in the configuration 710 shown in Fig. 7A, an SSB beam associated with SSB index 0 is mapped to an RO with index 0, an SSB beam associated with SSB index 1 is mapped to an RO with index 1, and so on, up to an SSB beam associated with SSB index 7 mapped to an RO with index 7, after which the RO indexes restart at 0. Accordingly, as shown by reference number 716, the UE 120 may select a beam associated with SSB index 0 for the PRACH preamble transmission, and may transmit the PRACH preamble in any RO mapped to SSB index 0.

[0114] Alternatively, Fig. 7B illustrates an example configuration 720 where a network node 110 transmits an SSB using different SSB beams that are each associated with an SSB index, and multiple SSB indexes are configured per RO. As shown by reference number 722, a UE0097-5744PCT120 may similarly select, among the multiple SSB beams that the network node 110 uses to transmit the SSB, an SSB index associated with a beam for a PRACH transmission. Furthermore, as shown by reference number 724, the UE 120 may similarly determine an SSB- RO mapping to identify one or more candidate ROs in which to transmit the PRACH preamble. For example, in the configuration 720 shown in Fig. 7B, the network node 110 transmits the SSB using 8 SSB beams, associated with SSB indexes 0-7, and 8 SSB indexes are configured per RO. Accordingly, the 8 SSB beams associated with SSB indexes 0-7 are each mapped to every RO. Accordingly, as shown by reference number 726, the UE 120 may transmit a PRACH preamble in any RO regardless of which SSB index the UE 120 selects.

[0115] In general, when a RACH configuration indicates that a single SSB is associated with each RO (e.g., the ssb-perRACH-OccasionAndCB-PreamblesPerSSB parameter is equal to 1), there may be a significant variation in RACH latency, call setup latency, handover data interruption, registration latency, or other delays related to a RACH procedure. For example, when a network node 110 transmits an SSB using multiple SSB beams and a single SSB index is associated with each RO (e.g., as shown in Fig. 7A), the RACH latency, handover data interruption, and / or registration latency may significantly vary depending on which SSB index is selected by the UE 120. For example, in shown in Fig. 7A, the latency is shortest when the UE 120 selects SSB index 0 mapped to RO index 0, and is longest when the UE 120 selects SSB index 7 mapped to RO index 7 (e.g., in accordance with an Ams separation between ROs occupying adjacent TTIs). Furthermore, in cases where the UE 120 does not transmit the PRACH preamble in the first RO mapped to the selected SSB index, there may be a significant delay before the next RO mapped to the selected SSB index. For example, when there is an X ms separation between ROs occupying adjacent TTIs, the UE 120 may have to wait 4X ms for the next available RO in cases where there are two ROs per TTI (e.g., occupying different frequency resources), or 8A ms for the next available RO in cases where there is one RO per TTI. Accordingly, in the configuration 710 shown in Fig. 7A, the RACH latency may vary in a range from about 10 ms to about 160 ms, and handover data interruption may vary in a range from about 50 ms to about 200 ms, depending on which SSB index the UE 120 selects. On the other hand, when a RACH configuration indicates that multiple SSBs are associated with each RO (e.g., N> 1), there may be less variation in the RACH latency and / or handover data interruption. For example, when a single RO can be used to transmit a PRACH preamble using a beam associated with any of the multiple SSB indexes associated with the RO, as shown in Fig. 7B, there is a more consistent RACH latency and / or handover data interruption across SSB indexes (e.g., about 10 ms). Furthermore, in cases where the UE 120 does not transmit the PRACH preamble in the first RO mapped to a selected SSB index, the UE 120 may transmit the PRACH preamble in the next RO.0097-5744PCT

[0116] However, when each RO is associated with multiple SSB indexes, there are circumstances in which a UE 120 may unnecessarily retransmit the PRACH preamble, which increases RACH latency, increases data interruption during handover, and / or increases UE power consumption, among other examples. For example, in a scenario where a first SSB index and a second SSB index are associated with the same RO, a first UE 120 may transmit a first PRACH preamble using a first beam associated with the first SSB index and a second UE 120 may transmit a second PRACH preamble using a second beam associated with the second SSB index. In a RACH procedure, following the PRACH preamble transmission, a UE 120 is generally expected to monitor a common search space for an RAR during an RAR window and to decode an uplink grant in response to receiving an RAR that includes a RAPID that matches an identifier associated with the PRACH preamble transmitted by the UE 120. For example, the UE 120 generally monitors the common search space for an RAR with a CRC scrambled by an RA-RNTI that is computed according to various parameters associated with the RO in which the PRACH preamble was transmitted (e.g., an index for a first symbol of the RO, .s' id, an index for a first slot of the RO in a system frame, t id, an index of the RO in a frequency domain, f id, and / or an uplink carrier used for the PRACH preamble transmission, ul carrier id). When the UE 120 detects an RAR with a CRC scrambled by the RA-RNTI associated with the RO in which the PRACH preamble was transmitted and the RAR indicates a RAPID that matches the identifier associated with the preamble transmitted by the UE 120, the UE 120 decodes an uplink grant in the RAR and uses the uplink grant for an uplink transmission (e.g., msg3).

[0117] Accordingly, when the network node 110 transmits a first RAR for the first UE 120 and a second RAR for the second UE 120 (e.g., using different frequency resources in the same slot or TTI), the two RARs will generally include CRCs that are scrambled by the same RA- RNTI. However, the two RARs may indicate different RAPIDs, corresponding to identifiers associated with the different preambles transmitted by the respective UEs 120. In a scenario where the first UE 120 is in or near the coverage area associated with SSB beams corresponding to both SSB indexes, both RARs will be detectable by the first UE 120. Consequently, the first UE 120 could potentially detect and decode the second RAR intended for the second UE 120, and may unnecessarily retransmit the PRACH preamble when the RAPID included in the second RAR does not match the identifier of the first PRACH preamble transmitted by the first UE 120 (e.g., the first UE 120 may retransmit the PRACH preamble when the RAR timer expires, without decoding the correct RAR intended for the first UE 120). Alternatively, if the network node 110 were to transmit RARs associated with the same RA-RNTI but different SSB indexes in different slots or TTIs (e.g., to differentiate RARs that are associated with different SSB indexes mapped to the same RO), the RAR(s) would be delayed for any UE(s) that used a beam other than a beam associated with the SSB beam having the lowest SSB index, which0097-5744PCTresults in a longer RACH latency, call setup latency, and / or handover data interruption for any such UE(s) 120.

[0118] Various aspects relate generally to enhanced random access, or enhancements to random access or RACH procedures, for RACH configurations associated with multiple SSBs per RO. Some aspects more specifically relate to enhanced RAR configurations to differentiate RARs that are associated with PRACH preambles transmitted via different SSB beams in the same RO. For example, when a network node 110 detects multiple PRACH preamble transmissions associated with different SSB receive beam directions in the same RO, the network node 110 may schedule multiple RARs that each indicate a respective SSB index. Accordingly, when the network node 110 transmits the RARs, which may include CRCs scrambled by the same RA-RNTI (e.g., associated with parameters related to the RO), a UE 120 may retransmit the PRACH preamble in cases where the UE 120 detects a RAR that indicates a RAPID that differs from the preamble ID associated with the PRACH preamble transmitted by the UE 120 and an SSB index that matches the SSB index associated with the beam selected by the UE 120. Alternatively, the UE 120 may continue RAR decoding to search for an RAR intended for the UE 120 in cases where the RAR indicates a RAPID that differs from the preamble ID associated with the PRACH preamble transmitted by the UE 120 and an SSB index that differs from the SSB index associated with the beam selected by the UE 120 (e.g., the different RAPID and the different SSB index may indicate that the RAR is intended for another UE 120 that transmitted a PRACH preamble in the same RO using a beam associated with a different SSB index than the SSB index selected by the UE 120). Alternatively, in some aspects, the SSB index associated with the PRACH preamble may be included among the parameters used to compute an RA-RNTI. In such cases, each UE 120 that transmits a PRACH preamble in an RO associated with multiple SSB indexes may monitor for an RAR with a CRC scrambled by an RA-RNTI associated with the SSB index selected by the UE 120, such that a UE 120 will not erroneously decode an RAR associated with a PRACH preamble transmitted via a beam associated with a different SSB index. In this way, by indicating the SSB index in the RAR or using the SSB index to compute the RA-RNTI associated with a RAR, some aspects described herein may reduce PRACH preamble retransmissions and the associated increase in RACH latency and / or power consumption that may otherwise occur when two or more UEs 120 transmit a PRACH preamble in the same RO using beams associated with different SSB indexes.

[0119] As indicated above, Figs. 7A-7B are provided as examples. Other examples may differ from what is described with regard to Figs. 7A-7B.

[0120] Figs. 8A-8B are diagrams illustrating examples 800A and 800B associated with enhanced random access for multiple SSBs per RO, in accordance with the present disclosure. As shown in Figs. 8A-8B, examples 800A and 800B includes communication between a0097-5744PCTnetwork node 110 and various UEs 120. In some aspects, the network node 110 and the UEs 120 may communicate in a wireless network, such as wireless communication network 100. The network node 110 and the UEs 120 may communicate via a wireless access link, which may include an uplink and a downlink.

[0121] As shown in Fig. 8A and Fig. 8B, and by reference number 805, one or more UEs 120 may transmit, and the network node 110 may receive (directly or via one or more other network nodes), UE capability signaling. For example, in some aspects, the UE capability signaling may indicate whether a UE 120 supports one or more random access enhancements for RACH configurations associated with multiple SSBs per RO. For example, in some aspects, a RACH configuration associated with multiple SSBs per RO may be associated with a first random access enhancement in which an RAR is enhanced to indicate an SSB index corresponding to an SSB receive beam direction associated with a msgl or msgA preamble transmission. Additionally, or alternatively, a RACH configuration associated with multiple SSBs per RO may be associated with a second random access enhancement in which an RA-RNTI used to scramble a CRC associated with an RAR is computed according to an SSB index corresponding to an SSB receive beam direction associated with a msgl or msgA preamble transmission. Accordingly, as described herein, the UE capability signaling provided to the network node 110 may indicate whether a UE 120 supports one or more random access enhancements for RACH configurations associated with multiple SSBs per RO. Additionally, or alternatively, when a UE 120 supports one or more random access enhancements for RACH configurations associated with multiple SSBs per RO, the UE capability signaling may indicate whether the UE 120 supports an enhanced RAR that indicates an SSB index, an RA-RNTI computation based on an SSB index, or both.

[0122] As shown in Fig. 8A and Fig. 8B, and by reference number 810, the network node 110 may transmit (directly or via one or more other network nodes), and the UEs 120 may receive, random access configuration information that configures one or more random access enhancements associated with multiple SSBs per RO. In some aspects, the UEs 120 may receive the random access configuration information via an SSB or a SIB, or via RRC signaling (e.g., an RRC reconfiguration message associated with a handover command). The random access configuration information may indicate one or more parameters associated with a RACH procedure, such as an RO configuration (e.g., time and frequency resources for PRACH transmissions), a PRACH preamble format, a preamble index, a preamble subcarrier spacing, a number of SSBs per RO, and / or a number of contention-based preambles per SSB, among other examples.

[0123] Furthermore, in cases where the random access configuration indicates that multiple SSBs (or SSB indexes) are associated with RO, the random access configuration may configure one or more enhancements to prevent or mitigate PRACH preamble retransmissions resulting0097-5744PCTfrom multiple UEs 120 transmitting PRACH preambles using beams associated with different SSB indexes that are mapped to the same RO. For example, in some aspects, the random access configuration may configure the first random access enhancement, where an RAR is enhanced to indicate an SSB index corresponding to an SSB receive beam direction associated with a msgl or msgA preamble transmission. Additionally, or alternatively, the random access configuration may configure the second random access enhancement, where an RA-RNTI used to scramble a CRC associated with an RAR is computed according to an SSB index corresponding to an SSB receive beam direction associated with a msgl or msgA preamble transmission. In some aspects, the network node 110 may configure the first random access enhancement, the second random access enhancement, or both, or neither, in accordance with the capabilities of the UEs 120.

[0124] As shown in Fig. 8A and Fig. 8B, and by reference number 815, each UE 120 or more UEs 120 may determine that a PRACH trigger condition is satisfied (e.g., a condition for triggering a PRACH preamble transmission). For example, in some aspects, the PRACH preamble transmission may be triggered for initial access by a UE 120 in an RRC idle state, to transition a UE 120 from an RRC inactive state to an RRC connected state, to reestablish an RRC connection, to perform a handover to a target cell, when downlink or uplink data arrives while a UE 120 is unsynchronized, when uplink data arrives at a UE 120 without a PUSCH resource allocation, to acquire on-demand system information, and / or to trigger beam failure recovery, among other examples. In such cases, each UE 120 that determines that a PRACH trigger condition is satisfied may generally select a beam to use for a PRACH transmission, where the selected beam may be associated with an SSB index corresponding to an SSB receive beam that the network node 110 uses to receive a PRACH preamble transmission. For example, in some aspects, each UE 120 that determines that a PRACH trigger condition is satisfied may select a beam corresponding to an SSB index associated with a highest RSRP measurement, or according to other suitable criteria.

[0125] As shown in Fig. 8A and Fig. 8B, and by reference number 820, each UE 120 for which a PRACH trigger condition is satisfied may transmit a PRACH preamble in an RO mapped to the SSB index associated with the SSB beam selected by the UE 120. As described herein, the RO may be mapped to multiple SSB indexes, whereby multiple UEs 120 may transmit respective PRACH preambles, associated with different preamble identifiers, in the same RO using beams associated with different SSB indexes that are mapped to the RO. Accordingly, as described herein, the network node 110 may generate and transmit multiple RARs, associated with multiple PRACH preambles that are transmitted in the same RO using beams associated with different SSB indexes. In some aspects, the RARs that are responsive to different PRACH preamble transmissions (e.g., from different UEs 120) may be associated with one or more random access enhancements to avoid PRACH preamble retransmissions that may0097-5744PCTotherwise occur when multiple UEs 120 transmit PRACH preambles using beams associated with different SSB indexes that are mapped to the same RO.

[0126] More particularly, as shown in Fig. 8 A, and by reference number 825, the network node 110 may transmit, and one or more UEs 120 may receive, one or more RARs that each indicate a respective SSB index associated with an SSB receive beam associated with a detected PRACH preamble transmission and a respective RAPID that corresponds to a preamble identifier associated with the detected PRACH preamble transmission. Furthermore, the one or more RARs may each include a CRC that may be scrambled by an RA-RNTI associated with the RO. For example, in some aspects, the RA-RNTI associated with an RO in which a PRACH preamble is transmitted may be calculated as 1 + s id + 14 * t id + 14 * 80 f id + 14 * 80 * 8 x ul carrier id, where s id is an index for a first symbol of the RO, t id is an index for a first slot of the RO in a system frame, f id is an index of the RO in a frequency domain, and ul carrier id is an uplink carrier used for the PRACH preamble transmission (which has a value of 0 unless the uplink carrier is a supplemental uplink carrier). Accordingly, in cases where the network node 110 detects multiple PRACH preamble transmissions in the same RO, but on different SSB receive beams, the network node 110 may schedule multiple RARs that each include a CRC scrambled by the same RA-RNTI (e.g., based at least in part on the s id, t_id , and ' id parameters associated with the RO). In addition, each RAR may indicate an SSB index corresponding to an SSB receive beam where a PRACH preamble was detected (e.g., in an RAR MAC-CE), and each RAR may indicate a RAPID associated with an identifier corresponding to the PRACH preamble detected on the associated SSB receive beam. In some aspects, the network node 110 may schedule and transmit RARs associated with different SSB indexes using different frequency resources (e.g., different physical resource blocks) in the same slot or TTI. Alternatively, in some aspects, multiple RARs associated with different SSB indexes may be combined within the same frequency resources in the same slot or TTI.

[0127] As further shown in Fig. 8A, and by reference number 830, a UE 120 that transmitted a PRACH preamble may monitor a common search space for an RAR that includes a CRC scrambled by an RA-RNTI associated with the RO in which the PRACH preamble was transmitted. For example, in some aspects, the UE 120 may monitor the common search space for the RAR during an RAR window. For example, in some aspects, the UE 120 may monitor the common search space and buffer in-phase and quadrature (IQ) data associated with the RA- RNTI that corresponds to the RO in which the UE 120 transmitted the PRACH preamble.

[0128] As further shown in Fig. 8A, and by reference number 835, a UE 120 that detects an RAR associated with an RA-RNTI that corresponds to the RO in which the UE 120 transmitted the PRACH preamble may decode the detected RAR. For example, in some aspects, the UE 120 may identify a RAPID indicated in the detected RAR, and may further identify an SSB index indicated in the detected RAR. In some aspects, as shown by reference number 840 in0097-5744PCTFig. 8 A, the UE 120 may retransmit the PRACH preamble in response to a determination that the decoded RAR indicates a RAPID that does not match an identifier associated with the PRACH preamble transmitted by the UE 120 and an SSB index that matches the SSB index associated with the beam that the UE 120 used to transmit the PRACH preamble. Alternatively, the UE 120 may retransmit the PRACH preamble in response to not detecting any RAR associated with the RA-RNTI that corresponds to the RO in which the UE 120 transmitted the PRACH preamble during the RAR window. In some aspects, in cases where the UE 120 retransmits the PRACH preamble, the PRACH preamble may be retransmitted at an increased transmit power, according to one or more power ramping rules.

[0129] Alternatively, in cases where a UE 120 detects an RAR associated with the RA-RNTI that corresponds to the RO in which the UE 120 transmitted the PRACH preamble, and the decoded RAR does not indicate the RAPID associated with the PRACH preamble transmitted by the UE 120 or indicates an SSB index that does not match the SSB index associated with the beam that the UE 120 used to transmit the PRACH preamble, the UE 120 may continue RAR decoding to search for another RAR that may be intended for the UE 120. For example, the UE 120 may continue to decode the buffered IQ data to search for another RAR associated with a CRC scrambled by the RA-RNTI that corresponds to the RO in which the UE 120 transmitted the PRACH preamble. Accordingly, as shown by reference number 845 in Fig. 8A, the UE 120 may perform an uplink transmission (e.g., a msg3 transmission) in response to detecting another RAR that is associated with the RA-RNTI, indicates the RAPID associated with the PRACH preamble transmitted by the UE 120, and indicates the SSB index associated with the beam that the UE 120 used to transmit the PRACH preamble. For example, in some aspects, the uplink transmission may be performed using a timing advance and / or uplink grant indicated in the RAR (e.g., according to a PUSCH frequency resource allocation, a PUSCH time resource allocation an MCS, and / or a PUSCH transmit power control command indicated in the RAR). In this way, when a UE 120 detects an RAR associated with the correct RA-RNTI but an incorrect RAPID, the UE 120 may continue RAR decoding and potentially avoid an unnecessary PRACH preamble retransmission if the UE 120 first decodes one or more RARs associated with different SSB indexes (e.g., RARs intended for different UEs 120).

[0130] Additionally, or alternatively, as shown in Fig. 8B, and by reference number 850, the network node 110 may transmit, and one or more UEs 120 may receive, one or more RARs that each indicate a respective RAPID that corresponds to a preamble identifier associated with a detected PRACH preamble transmission. Furthermore, the one or more RARs may each include a CRC that may be scrambled by an RA-RNTI associated with an SSB index corresponding to an SSB receive beam associated with the detected PRACH preamble transmission. For example, in some aspects, the SSB index associated with a PRACH preamble transmission may be used in the RA-RNTI computation, either alone or in combination with one0097-5744PCTor more parameters associated with the RO (e.g., the s id. t_id,fjd, and / or ul carrierjd parameters). Accordingly, in cases where the network node 110 detects multiple PRACH preamble transmissions in the same RO, but on different SSB receive beams, the network node 110 may schedule multiple RARs that each include a CRC scrambled by an RA-RNTI that is based at least in part on the SSB index associated with the corresponding SSB receive beam. In some aspects, the network node 110 may schedule and transmit RARs associated with different SSB indexes in the same slot or TTI (e.g., using different frequency resources, such as different physical resource blocks, or the same frequency resources).

[0131] As further shown in Fig. 8B, and by reference number 855, a UE 120 that transmitted a PRACH preamble may monitor a common search space for an RAR that includes a CRC scrambled by an RA-RNTI associated with the SSB index corresponding to the beam used to transmit the PRACH preamble. For example, in some aspects, the UE 120 may monitor the common search space for the RAR during an RAR window. For example, in some aspects, the UE 120 may monitor the common search space and buffer IQ data associated with the RA- RNTI associated with the RO in which the UE 120 transmitted the PRACH preamble and the SSB index corresponding to the beam that the UE 120 used to transmit the PRACH preamble.

[0132] As further shown in Fig. 8B, and by reference number 860, a UE 120 that detects an RAR with a CRC scrambled by RA-RNTI associated with the RO and the SSB index for the PRACH preamble transmitted by the UE 120 may then decode the detected RAR. For example, in some aspects, the UE 120 may identify a RAPID indicated in the detected RAR, and may determine whether the RAPID corresponds to the identifier associated with the PRACH preamble transmitted by the UE 120. In some aspects, as shown by reference number 865 in Fig. 8B, the UE 120 may retransmit the PRACH preamble in response to a determination that the decoded RAR indicates a RAPID that does not match the identifier associated with the PRACH preamble transmitted by the UE 120. Alternatively, the UE 120 may retransmit the PRACH preamble in response to not detecting any RAR associated with the RA-RNTI that corresponds to the RO and the SSB index for the PRACH preamble transmitted by the UE 120 during the RAR window. In some aspects, in cases where the UE 120 retransmits the PRACH preamble, the PRACH preamble may be retransmitted at an increased transmit power, according to one or more power ramping rules.

[0133] Alternatively, as shown by reference number 870 in Fig. 8B, the UE 120 may perform an uplink transmission (e.g., a msg3 transmission) in response to the RAR associated with the RA-RNTI corresponding to the RO and the SSB index for the PRACH preamble transmitted by the UE 120 indicating a RAPID that matches the identifier associated with the PRACH preamble transmitted by the UE 120. For example, in some aspects, the uplink transmission may be performed using a timing advance and / or uplink grant indicated in the RAR (e.g., according to a PUSCH frequency resource allocation, a PUSCH time resource allocation an0097-5744PCTMCS, and / or a PUSCH transmit power control command indicated in the RAR). In this way, when multiple SSBs are associated with an RO, a UE 120 may only monitor the common search space for an RAR associated with an RA-RNTI corresponding to the RO and the SSB index associated with the PRACH preamble transmitted by the UE 120. In this way, the UE 120 may avoid an unnecessary PRACH preamble retransmission that may otherwise occur in cases where the UE 120 decodes an RAR associated with a PRACH preamble that was transmitted using a beam associated with an SSB index other than the SSB index associated with the PRACH preamble transmitted by the UE 120.

[0134] As indicated above, Figs. 8A-8B are provided as examples. Other examples may differ from what is described with regard to Figs. 8A-8B.

[0135] Fig. 9 is a diagram illustrating an example process 900 performed, for example, at a UE or an apparatus of a UE, in accordance with the present disclosure. Example process 900 is an example where the apparatus or the UE (e.g., UE 120) performs operations associated with enhanced random access for multiple SSBs per RO.

[0136] As shown in Fig. 9, in some aspects, process 900 may include transmitting, in an SSB beam direction, at least one preamble in an RO associated with multiple SSBs (block 910). For example, the UE (e.g., using transmission component 1104 and / or communication manager 1106, depicted in Fig. 11) may transmit, in an SSB beam direction, at least one preamble in an RO associated with multiple SSBs, as described above.

[0137] As further shown in Fig. 9, in some aspects, process 900 may include monitoring, in the SSB beam direction, at least one search space for an RAR associated with the at least one preamble (block 920). For example, the UE (e.g., using communication manager 1106, depicted in Fig. 11) may monitor, in the SSB beam direction, at least one search space for an RAR associated with the at least one preamble, as described above.

[0138] Process 900 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in connection with one or more other processes described elsewhere herein.

[0139] In a first aspect, process 900 includes detecting, in the at least one monitored search space, an RAR scrambled by an RA-RNTI associated with one or more of the RO or the SSB beam direction, and retransmitting the at least one preamble in accordance with the detected RAR indicating a RAPID that differs from the at least one transmitted preamble and an SSB index that matches the SSB beam direction.

[0140] In a second aspect, alone or in combination with the first aspect, process 900 includes detecting, in the at least one monitored search space, a first RAR scrambled by an RA-RNTI associated with one or more of the RO or the SSB beam direction, and searching the at least one monitored search space for a second RAR scrambled by the RA-RNTI associated with the RO0097-5744PCTin accordance with the first RAR indicating a RAPID that differs from the at least one transmitted preamble and an SSB index that differs from the SSB beam direction.

[0141] In a third aspect, alone or in combination with one or more of the first and second aspects, process 900 includes detecting, in the at least one monitored search space, the second RAR scrambled by the RA-RNTI associated with one or more of the RO or the SSB beam direction, and transmitting a message using an uplink grant associated with the second RAR in accordance with the second RAR indicating a RAPID that matches the at least one transmitted preamble and an SSB index that matches the SSB beam direction.

[0142] In a fourth aspect, alone or in combination with one or more of the first through third aspects, the first RAR is detected in a first frequency location associated with a time domain resource and the second RAR is detected in a second frequency location associated with the same time domain resource.

[0143] In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, process 900 includes detecting, in the at least one monitored search space, an RAR scrambled by an RA-RNTI associated with one or more of the RO or the SSB beam direction, and transmitting a message using an uplink grant associated with the RAR in accordance with the RAR indicating a RAPID that matches the at least one transmitted preamble and an SSB index that matches the SSB beam direction.

[0144] In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, process 900 includes detecting, in the at least one monitored search space, an RAR scrambled by an RA-RNTI associated with one or more of the RO or the SSB beam direction, and retransmitting the at least one preamble in accordance with the detected RAR indicating a RAPID that differs from the at least one transmitted preamble.

[0145] In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, process 900 includes detecting, in the at least one monitored search space, an RAR scrambled by an RA-RNTI associated with one or more of the RO or the SSB beam direction, and transmitting a message using an uplink grant associated with the RAR in accordance with the RAR indicating a RAPID that matches the at least one transmitted preamble.

[0146] In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, process 900 includes transmitting information indicating a capability to perform RAR monitoring for a RACH configuration associated with an indication of one or more SSBs in the RAR.

[0147] In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, process 900 includes receiving information configuring RAR monitoring associated with the SSB beam direction for a RACH configuration associated with multiple SSBs per RO.0097-5744PCT

[0148] Although Fig. 9 shows example blocks of process 900, in some aspects, process 900 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 9. Additionally, or alternatively, two or more of the blocks of process 900 may be performed in parallel.

[0149] Fig. 10 is a diagram illustrating an example process 1000 performed, for example, at a network node or an apparatus of a network node, in accordance with the present disclosure. Example process 1000 is an example where the apparatus or the network node (e.g., network node 110) performs operations associated with enhanced random access for multiple SSBs per RO.

[0150] As shown in Fig. 10, in some aspects, process 1000 may include receiving, in an RO associated with multiple SSBs, a first preamble via a first SSB receive beam and a second preamble via a second SSB receive beam (block 1010). For example, the network node (e.g., using reception component 1202 and / or communication manager 1206, depicted in Fig. 12) may receive, in an RO associated with multiple SSBs, a first preamble via a first SSB receive beam and a second preamble via a second SSB receive beam, as described above.

[0151] As further shown in Fig. 10, in some aspects, process 1000 may include transmitting, in a search space, a first RAR indicating the first preamble and a first SSB index associated with the first SSB receive beam (block 1020). For example, the network node (e.g., using transmission component 1204 and / or communication manager 1206, depicted in Fig. 12) may transmit, in a search space, a first RAR indicating the first preamble and a first SSB index associated with the first SSB receive beam, as described above.

[0152] As further shown in Fig. 10, in some aspects, process 1000 may include transmitting, in the search space, a second RAR indicating the second preamble and a second SSB index associated with the second SSB receive beam (block 1030). For example, the network node (e.g., using transmission component 1204 and / or communication manager 1206, depicted in Fig. 12) may transmit, in the search space, a second RAR indicating the second preamble and a second SSB index associated with the second SSB receive beam, as described above.

[0153] Process 1000 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in connection with one or more other processes described elsewhere herein.

[0154] In a first aspect, the first RAR and the second RAR are scrambled by the same RA- RNTI.

[0155] In a second aspect, alone or in combination with the first aspect, the first RAR is transmitted in a first frequency location associated with a time domain resource and the second RAR is transmitted in a second frequency location associated with the same time domain resource.0097-5744PCT

[0156] In a third aspect, alone or in combination with one or more of the first and second aspects, the first RAR and the second RAR are combined within in a frequency location associated with a time domain resource.

[0157] In a fourth aspect, alone or in combination with one or more of the first through third aspects, the first RAR is scrambled by a first RA-RNTI associated with one or more of the RO or the first SSB index, and wherein the second RAR is scrambled by a second RA-RNTI associated with one or more of the RO or the second SSB index.

[0158] In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, process 1000 includes receiving information indicating a UE capability to perform RAR monitoring for a RACH configuration associated with an indication of one or more SSBs in the RAR.

[0159] In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, process 1000 includes receiving information indicating a UE capability to perform RAR monitoring associated with an RA-RNTI that is based at least in part on an SSB index.

[0160] In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, process 1000 includes receiving information indicating a UE capability to perform RAR monitoring associated with an RAR indicating an SSB index.

[0161] In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, process 1000 includes transmitting information configuring RAR monitoring for a RACH configuration associated with multiple SSBs per RO.

[0162] Although Fig. 10 shows example blocks of process 1000, in some aspects, process 1000 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 10. Additionally, or alternatively, two or more of the blocks of process 1000 may be performed in parallel.

[0163] Fig. 11 is a diagram of an example apparatus 1100 for wireless communication, in accordance with the present disclosure. The apparatus 1100 may be a UE, or a UE may include the apparatus 1100. In some aspects, the apparatus 1100 includes a reception component 1102, a transmission component 1104, and / or a communication manager 1106, which may be in communication with one another (for example, via one or more buses and / or one or more other components). In some aspects, the communication manager 1106 is the communication manager 140 described in connection with Fig. 1. As shown, the apparatus 1100 may communicate with another apparatus 1108, such as a UE or a network node (such as a CU, a DU, an RU, or a base station), using the reception component 1102 and the transmission component 1104.

[0164] In some aspects, the apparatus 1100 may be configured to perform one or more operations described herein in connection with Figs. 8A-8B. Additionally, or alternatively, the0097-5744PCTapparatus 1100 may be configured to perform one or more processes described herein, such as process 900 of Fig. 9. In some aspects, the apparatus 1100 and / or one or more components shown in Fig. 11 may include one or more components of the UE described in connection with Fig. 1 and Fig. 2. Additionally, or alternatively, one or more components shown in Fig. 11 may be implemented within one or more components described in connection with Fig. 1 and Fig. 2. Additionally, or alternatively, one or more components of the set of components may be implemented at least in part as software stored in one or more memories. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by one or more controllers or one or more processors to perform the functions or operations of the component.

[0165] The reception component 1102 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 1108. The reception component 1102 may provide received communications to one or more other components of the apparatus 1100. In some aspects, the reception component 1102 may perform signal processing on the received communications (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, de-mapping, equalization, interference cancellation, or decoding, among other examples), and may provide the processed signals to the one or more other components of the apparatus 1100. In some aspects, the reception component 1102 may include one or more antennas, one or more modems, one or more demodulators, one or more MIMO detectors, one or more receive processors, one or more controllers / processors, one or more memories, or a combination thereof, of the UE described in connection with Fig. 1 and Fig. 2.

[0166] The transmission component 1104 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 1108. In some aspects, one or more other components of the apparatus 1100 may generate communications and may provide the generated communications to the transmission component 1104 for transmission to the apparatus 1108. In some aspects, the transmission component 1104 may perform signal processing on the generated communications (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples), and may transmit the processed signals to the apparatus 1108. In some aspects, the transmission component 1104 may include one or more antennas, one or more modems, one or more modulators, one or more transmit MIMO processors, one or more transmit processors, one or more controllers / processors, one or more memories, or a combination thereof, of the UE described in connection with Fig. 1 and Fig. 2. In some aspects, the transmission component 1104 may be co-located with the reception component 1102 in one or more transceivers.0097-5744PCT

[0167] The communication manager 1106 may support operations of the reception component 1102 and / or the transmission component 1104. For example, the communication manager 1106 may receive information associated with configuring reception of communications by the reception component 1102 and / or transmission of communications by the transmission component 1104. Additionally, or alternatively, the communication manager 1106 may generate and / or provide control information to the reception component 1102 and / or the transmission component 1104 to control reception and / or transmission of communications.

[0168] The transmission component 1104 may transmit, in an SSB beam direction, at least one preamble in an RO associated with multiple SSBs. The communication manager 1106 may monitor, in the SSB direction, at least one search space for an RAR associated with the at least one preamble.

[0169] The communication manager 1106 may detect, in the at least one monitored search space, an RAR scrambled by an RA-RNTI associated with one or more of the RO or the SSB beam direction. The transmission component 1104 may retransmit the at least one preamble in accordance with the detected RAR indicating a RAPID that differs from the at least one transmitted preamble and an SSB index that matches the SSB beam direction.

[0170] The communication manager 1106 may detect, in the at least one monitored search space, a first RAR scrambled by an RA-RNTI associated with one or more of the RO or the SSB beam direction. The communication manager 1106 may search the at least one monitored search space for a second RAR scrambled by the RA-RNTI associated with the RO in accordance with the first RAR indicating a RAPID that differs from the at least one transmitted preamble and an SSB index that differs from the SSB beam direction.

[0171] The communication manager 1106 may detect, in the at least one monitored search space, an RAR scrambled by an RA-RNTI associated with one or more of the RO or the SSB beam direction. The transmission component 1104 may transmit a message using an uplink grant associated with the RAR in accordance with the RAR indicating a RAPID that matches the at least one transmitted preamble and an SSB index that matches the SSB beam direction.

[0172] The communication manager 1106 may detect, in the at least one monitored search space, an RAR scrambled by an RA-RNTI associated with one or more of the RO or the SSB beam direction. The transmission component 1104 may retransmit the at least one preamble in accordance with the detected RAR indicating a RAPID that differs from the at least one transmitted preamble.

[0173] The communication manager 1106 may detect, in the at least one monitored search space, an RAR scrambled by an RA-RNTI associated with one or more of the RO or the SSB beam direction. The transmission component 1104 may transmit a message using an uplink0097-5744PCTgrant associated with the RAR in accordance with the RAR indicating a RAPID that matches the at least one transmitted preamble.

[0174] The transmission component 1104 may transmit information indicating a capability to perform RAR monitoring for a RACH configuration associated with an indication of one or more SSBs in the RAR.

[0175] The reception component 1102 may receive information configuring RAR monitoring associated with the SSB beam direction for a RACH configuration associated with multiple SSBs per RO.

[0176] The number and arrangement of components shown in Fig. 11 are provided as an example. In practice, there may be additional components, fewer components, different components, or differently arranged components than those shown in Fig. 11. Furthermore, two or more components shown in Fig. 11 may be implemented within a single component, or a single component shown in Fig. 11 may be implemented as multiple, distributed components. Additionally, or alternatively, a set of (one or more) components shown in Fig. 11 may perform one or more functions described as being performed by another set of components shown in Fig. 11.

[0177] Fig. 12 is a diagram of an example apparatus 1200 for wireless communication, in accordance with the present disclosure. The apparatus 1200 may be a network node, or a network node may include the apparatus 1200. In some aspects, the apparatus 1200 includes a reception component 1202, a transmission component 1204, and / or a communication manager 1206, which may be in communication with one another (for example, via one or more buses and / or one or more other components). In some aspects, the communication manager 1206 is the communication manager 150 described in connection with Fig. 1. As shown, the apparatus 1200 may communicate with another apparatus 1208, such as a UE or a network node (such as a CU, a DU, an RU, or a base station), using the reception component 1202 and the transmission component 1204.

[0178] In some aspects, the apparatus 1200 may be configured to perform one or more operations described herein in connection with Figs. 8A-8B. Additionally, or alternatively, the apparatus 1200 may be configured to perform one or more processes described herein, such as process 1000 of Fig. 10. In some aspects, the apparatus 1200 and / or one or more components shown in Fig. 12 may include one or more components of the network node described in connection with Fig. 1 and Fig. 2. Additionally, or alternatively, one or more components shown in Fig. 12 may be implemented within one or more components described in connection with Fig. 1 and Fig. 2. Additionally, or alternatively, one or more components of the set of components may be implemented at least in part as software stored in one or more memories. For example, a component (or a portion of a component) may be implemented as instructions or0097-5744PCTcode stored in a non-transitory computer-readable medium and executable by one or more controllers or one or more processors to perform the functions or operations of the component.

[0179] The reception component 1202 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 1208. The reception component 1202 may provide received communications to one or more other components of the apparatus 1200. In some aspects, the reception component 1202 may perform signal processing on the received communications (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, de-mapping, equalization, interference cancellation, or decoding, among other examples), and may provide the processed signals to the one or more other components of the apparatus 1200. In some aspects, the reception component 1202 may include one or more antennas, one or more modems, one or more demodulators, one or more MIMO detectors, one or more receive processors, one or more controllers / processors, one or more memories, or a combination thereof, of the network node described in connection with Fig. 1 and Fig. 2. In some aspects, the reception component 1202 and / or the transmission component 1204 may include or may be included in a network interface. The network interface may be configured to obtain and / or output signals for the apparatus 1200 via one or more communications links, such as a backhaul link, a midhaul link, and / or a fronthaul link.

[0180] The transmission component 1204 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 1208. In some aspects, one or more other components of the apparatus 1200 may generate communications and may provide the generated communications to the transmission component 1204 for transmission to the apparatus 1208. In some aspects, the transmission component 1204 may perform signal processing on the generated communications (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples), and may transmit the processed signals to the apparatus 1208. In some aspects, the transmission component 1204 may include one or more antennas, one or more modems, one or more modulators, one or more transmit MIMO processors, one or more transmit processors, one or more controllers / processors, one or more memories, or a combination thereof, of the network node described in connection with Fig. 1 and Fig. 2. In some aspects, the transmission component 1204 may be co-located with the reception component 1202 in one or more transceivers.

[0181] The communication manager 1206 may support operations of the reception component 1202 and / or the transmission component 1204. For example, the communication manager 1206 may receive information associated with configuring reception of communications by the reception component 1202 and / or transmission of communications by the transmission component 1204. Additionally, or alternatively, the communication manager0097-5744PCT1206 may generate and / or provide control information to the reception component 1202 and / or the transmission component 1204 to control reception and / or transmission of communications.

[0182] The reception component 1202 may receive, in an RO associated with multiple SSBs, a first preamble via a first SSB receive beam and a second preamble via a second SSB receive beam. The transmission component 1204 may transmit, in a search space, a first RAR indicating the first preamble and a first SSB index associated with the first SSB receive beam. The transmission component 1204 may transmit, in the search space, a second RAR indicating the second preamble and a second SSB index associated with the second SSB receive beam.

[0183] The reception component 1202 may receive information indicating a UE capability to perform RAR monitoring for a RACH configuration associated with an indication of one or more SSBs in the RAR.

[0184] The reception component 1202 may receive information indicating a UE capability to perform RAR monitoring associated with an RA-RNTI that is based at least in part on an SSB index.

[0185] The reception component 1202 may receive information indicating a UE capability to perform RAR monitoring associated with an RAR indicating an SSB index.

[0186] The transmission component 1204 may transmit information configuring RAR monitoring for a RACH configuration associated with multiple SSBs per RO.

[0187] The number and arrangement of components shown in Fig. 12 are provided as an example. In practice, there may be additional components, fewer components, different components, or differently arranged components than those shown in Fig. 12. Furthermore, two or more components shown in Fig. 12 may be implemented within a single component, or a single component shown in Fig. 12 may be implemented as multiple, distributed components. Additionally, or alternatively, a set of (one or more) components shown in Fig. 12 may perform one or more functions described as being performed by another set of components shown in Fig. 12.

[0188] The following provides an overview of some Aspects of the present disclosure:

[0189] Aspect 1 : A method of wireless communication performed by a UE, comprising: transmitting, in an SSB beam direction, at least one preamble in an RO associated with multiple SSBs; and monitoring, in the SSB beam direction, at least one search space for an RAR associated with the at least one preamble.

[0190] Aspect 2: The method of Aspect 1, further comprising: detecting, in the at least one monitored search space, an RAR scrambled by an RA-RNTI associated with one or more of the RO or the SSB beam direction; and retransmitting the at least one preamble in accordance with the detected RAR indicating a RAPID that differs from the at least one transmitted preamble and an SSB index that matches the SSB beam direction.0097-5744PCT

[0191] Aspect 3: The method of any of Aspects 1-2, further comprising: detecting, in the at least one monitored search space, a first RAR scrambled by an RA-RNTI associated with one or more of the RO or the SSB beam direction; and searching the at least one monitored search space for a second RAR scrambled by the RA-RNTI associated with the RO in accordance with the first RAR indicating a RAPID that differs from the at least one transmitted preamble and an SSB index that differs from the SSB beam direction.

[0192] Aspect 4: The method of Aspect 3, further comprising: detecting, in the at least one monitored search space, the second RAR scrambled by the RA-RNTI associated with one or more of the RO or the SSB beam direction; and transmitting a message using an uplink grant associated with the second RAR in accordance with the second RAR indicating a RAPID that matches the at least one transmitted preamble and an SSB index that matches the SSB beam direction.

[0193] Aspect 5: The method of Aspect 4, wherein the first RAR is detected in a first frequency location associated with a time domain resource and the second RAR is detected in a second frequency location associated with the same time domain resource.

[0194] Aspect 6: The method of any of Aspects 1-5, further comprising: detecting, in the at least one monitored search space, an RAR scrambled by an RA-RNTI associated with one or more of the RO or the SSB beam direction; and transmitting a message using an uplink grant associated with the RAR in accordance with the RAR indicating a RAPID that matches the at least one transmitted preamble and an SSB index that matches the SSB beam direction.

[0195] Aspect 7: The method of any of Aspects 1-6, further comprising: detecting, in the at least one monitored search space, an RAR scrambled by an RA-RNTI associated with one or more of the RO or the SSB beam direction; and retransmitting the at least one preamble in accordance with the detected RAR indicating a RAPID that differs from the at least one transmitted preamble.

[0196] Aspect 8: The method of any of Aspects 1-7, further comprising: detecting, in the at least one monitored search space, an RAR scrambled by an RA-RNTI associated with one or more of the RO or the SSB beam direction; and transmitting a message using an uplink grant associated with the RAR in accordance with the RAR indicating a RAPID that matches the at least one transmitted preamble.

[0197] Aspect 9: The method of any of Aspects 1-8, further comprising: transmitting information indicating a capability to perform RAR monitoring for a RACH configuration associated with an indication of one or more SSBs in the RAR.

[0198] Aspect 10: The method of any of Aspects 1-9, further comprising: receiving information configuring RAR monitoring associated with the SSB beam direction for a RACH configuration associated with multiple SSBs per RO.0097-5744PCT

[0199] Aspect 11 : A method of wireless communication performed by a network node, comprising: receiving, in an RO associated with multiple SSBs, a first preamble via a first SSB receive beam and a second preamble via a second SSB receive beam; transmitting, in a search space, a first RAR indicating the first preamble and a first SSB index associated with the first SSB receive beam; and transmitting, in the search space, a second RAR indicating the second preamble and a second SSB index associated with the second SSB receive beam.

[0200] Aspect 12: The method of Aspect 11, wherein the first RAR and the second RAR are scrambled by the same RA-RNTI.

[0201] Aspect 13: The method of any of Aspects 11-12, wherein the first RAR is transmitted in a first frequency location associated with a time domain resource and the second RAR is transmitted in a second frequency location associated with the same time domain resource.

[0202] Aspect 14: The method of any of Aspects 11-13, wherein the first RAR and the second RAR are combined within in a frequency location associated with a time domain resource.

[0203] Aspect 15: The method of any of Aspects 11-14, wherein the first RAR is scrambled by a first RA-RNTI associated with one or more of the RO or the first SSB index, and wherein the second RAR is scrambled by a second RA-RNTI associated with one or more of the RO or the second SSB index.

[0204] Aspect 16: The method of any of Aspects 11-15, further comprising: receiving information indicating a UE capability to perform RAR monitoring for a RACH configuration associated with an indication of one or more SSBs in the RAR.

[0205] Aspect 17: The method of any of Aspects 11-16, further comprising: receiving information indicating a UE capability to perform RAR monitoring associated with an RA- RNTI that is based at least in part on an SSB index.

[0206] Aspect 18: The method of any of Aspects 11-17, further comprising: receiving information indicating a UE capability to perform RAR monitoring associated with an RAR indicating an SSB index.

[0207] Aspect 19: The method of any of Aspects 11-18, further comprising: transmitting information configuring RAR monitoring for a RACH configuration associated with multiple SSBs per RO.

[0208] Aspect 20: An apparatus for wireless communication at a device, the apparatus comprising one or more processors; one or more memories coupled with the one or more processors; and instructions stored in the one or more memories and executable by the one or more processors to cause the apparatus to perform the method of one or more of Aspects 1-19.

[0209] Aspect 21 : An apparatus for wireless communication at a device, the apparatus comprising one or more memories and one or more processors coupled to the one or more0097-5744PCTmemories, the one or more processors configured to cause the device to perform the method of one or more of Aspects 1-19.

[0210] Aspect 22: An apparatus for wireless communication, the apparatus comprising at least one means for performing the method of one or more of Aspects 1-19.

[0211] Aspect 23: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by one or more processors to perform the method of one or more of Aspects 1-19.

[0212] Aspect 24: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform the method of one or more of Aspects 1-19.

[0213] Aspect 25: A device for wireless communication, the device comprising a processing system that includes one or more processors and one or more memories coupled with the one or more processors, the processing system configured to cause the device to perform the method of one or more of Aspects 1-19.

[0214] Aspect 26: An apparatus for wireless communication at a device, the apparatus comprising one or more memories and one or more processors coupled to the one or more memories, the one or more processors individually or collectively configured to cause the device to perform the method of one or more of Aspects 1-19.

[0215] The foregoing disclosure provides illustration and description but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired from practice of the aspects.

[0216] As used herein, the term “component” is intended to be broadly construed as hardware or a combination of hardware and at least one of software or firmware. “Software” shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, or functions, among other examples, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. As used herein, a “processor” is implemented in hardware or a combination of hardware and software. It will be apparent that systems or methods described herein may be implemented in different forms of hardware or a combination of hardware and software. The actual specialized control hardware or software code used to implement these systems or methods is not limiting of the aspects. Thus, the operation and behavior of the systems or methods are described herein without reference to specific software code, because those skilled in the art will understand that software and hardware can be designed to implement the systems or methods based, at least in part, on the0097-5744PCTdescription herein. A component being configured to perform a function means that the component has a capability to perform the function, and does not require the function to be actually performed by the component, unless noted otherwise.

[0217] As used herein, “satisfying a threshold” may, depending on the context, refer to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, or not equal to the threshold, among other examples.

[0218] As used herein, a phrase referring to “at least one of’ a list of items refers to any combination of those items, including single members. As an example, “at least one of: a, b, or c” is intended to cover a, b, c, a + b, a + c, b + c, and a + b + c, as well as any combination with multiples of the same element (for example, a + a, a + a + a, a + a + b, a + a + c, a + b + b, a + c + c, b + b, b + b + b, b + b + c, c + c, and c + c + c, or any other ordering of a, b, and c).

[0219] No element, act, or instruction used herein should be construed as critical or essential unless explicitly described as such. Also, as used herein, the articles “a” and “an” are intended to include one or more items and may be used interchangeably with “one or more.” Further, as used herein, the article “the” is intended to include one or more items referenced in connection with the article “the” and may be used interchangeably with “the one or more.” Furthermore, as used herein, the terms “set” and “group” are intended to include one or more items and may be used interchangeably with “one or more.” Where only one item is intended, the phrase “only one” or similar language is used. Also, as used herein, the terms “has,” “have,” “having,” and similar terms are intended to be open-ended terms that do not limit an element that they modify (for example, an element “having” A may also have B). Further, the phrase “based on” is intended to mean “based on or otherwise in association with” unless explicitly stated otherwise. Also, as used herein, the term “or” is intended to be inclusive when used in a series and may be used interchangeably with “and / or,” unless explicitly stated otherwise (for example, if used in combination with “either” or “only one of’). It should be understood that “one or more” is equivalent to “at least one.”

[0220] Even though particular combinations of features are recited in the claims or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. Many of these features may be combined in ways not specifically recited in the claims or disclosed in the specification. The disclosure of various aspects includes each dependent claim in combination with every other claim in the claim set.0097-5744PCT

Claims

WHAT IS CLAIMED IS:

1. A user equipment (UE) for wireless communication, comprising: one or more memories; and one or more processors, coupled to the one or more memories, configured to cause the UE to: transmit, in a synchronization signal block (SSB) beam direction, at least one preamble in a random access channel (RACH) occasion (RO) associated with multiple SSBs; and monitor, in the SSB beam direction, at least one search space for a random access response (RAR) associated with the at least one preamble.

2. The UE of claim 1, wherein the one or more processors are further configured to cause the UE to: detect, in the at least one monitored search space, an RAR scrambled by a random access radio network temporary identifier (RA-RNTI) associated with one or more of the RO or the SSB beam direction; and retransmit the at least one preamble in accordance with the detected RAR indicating a random access preamble identifier (RAPID) that differs from the at least one transmitted preamble and an SSB index that matches the SSB beam direction.

3. The UE of claim 1, wherein the one or more processors are further configured to cause the UE to: detect, in the at least one monitored search space, a first RAR scrambled by a random access radio network temporary identifier (RA-RNTI) associated with one or more of the RO or the SSB beam direction; and search the at least one monitored search space for a second RAR scrambled by the RA- RNTI associated with the RO in accordance with the first RAR indicating a random access preamble identifier (RAPID) that differs from the at least one transmitted preamble and an SSB index that differs from the SSB beam direction.

4. The UE of claim 3, wherein the one or more processors are further configured to cause the UE to: detect, in the at least one monitored search space, the second RAR scrambled by the RA-RNTI associated with one or more of the RO or the SSB beam direction; and transmit a message using an uplink grant associated with the second RAR in accordance with the second RAR indicating a RAPID that matches the at least one transmitted preamble and an SSB index that matches the SSB beam direction.0097-5744PCT5. The UE of claim 4, wherein the first RAR is detected in a first frequency location associated with a time domain resource and the second RAR is detected in a second frequency location associated with the same time domain resource.

6. The UE of claim 1, wherein the one or more processors are further configured to cause the UE to: detect, in the at least one monitored search space, an RAR scrambled by a random access radio network temporary identifier (RA-RNTI) associated with one or more of the RO or the SSB beam direction; and transmit a message using an uplink grant associated with the RAR in accordance with the RAR indicating a RAPID that matches the at least one transmitted preamble and an SSB index that matches the SSB beam direction.

7. The UE of claim 1, wherein the one or more processors are further configured to cause the UE to: detect, in the at least one monitored search space, an RAR scrambled by a random access radio network temporary identifier (RA-RNTI) associated with one or more of the RO or the SSB beam direction; and retransmit the at least one preamble in accordance with the detected RAR indicating a random access preamble identifier (RAPID) that differs from the at least one transmitted preamble.

8. The UE of claim 1, wherein the one or more processors are further configured to cause the UE to: detect, in the at least one monitored search space, an RAR scrambled by a random access radio network temporary identifier (RA-RNTI) associated with one or more of the RO or the SSB beam direction; and transmit a message using an uplink grant associated with the RAR in accordance with the RAR indicating a RAPID that matches the at least one transmitted preamble.

9. The UE of claim 1, wherein the one or more processors are further configured to cause the UE to: transmit information indicating a capability to perform RAR monitoring for a RACH configuration associated with an indication of one or more SSBs in the RAR.0097-5744PCT10. The UE of claim 1, wherein the one or more processors are further configured to cause the UE to: receive information configuring RAR monitoring associated with the SSB beam direction for a RACH configuration associated with multiple SSBs per RO.

11. A network node for wireless communication, comprising: one or more memories; and one or more processors, coupled to the one or more memories, configured to cause the network node to: receive, in a random access channel (RACH) occasion (RO) associated with multiple synchronization signal blocks (SSBs), a first preamble via a first SSB receive beam and a second preamble via a second SSB receive beam; transmit, in a search space, a first random access response (RAR) indicating the first preamble and a first SSB index associated with the first SSB receive beam; and transmit, in the search space, a second RAR indicating the second preamble and a second SSB index associated with the second SSB receive beam.

12. The network node of claim 11, wherein the first RAR and the second RAR are scrambled by the same random access radio network temporary identifier (RA-RNTI).

13. The network node of claim 11, wherein the first RAR is transmitted in a first frequency location associated with a time domain resource and the second RAR is transmitted in a second frequency location associated with the same time domain resource.

14. The network node of claim 11, wherein the first RAR and the second RAR are combined within in a frequency location associated with a time domain resource.

15. The network node of claim 11, wherein the first RAR is scrambled by a first random access radio network temporary identifier (RA-RNTI) associated with one or more of the RO or the first SSB index, and wherein the second RAR is scrambled by a second RA-RNTI associated with one or more of the RO or the second SSB index.

16. The network node of claim 11, wherein the one or more processors are further configured to cause the network node to: receive information indicating a user equipment (UE) capability to perform RAR monitoring for a RACH configuration associated with an indication of one or more SSBs in the RAR.0097-5744PCT17. The network node of claim 11, wherein the one or more processors are further configured to cause the network node to: receive information indicating a user equipment (UE) capability to perform RAR monitoring associated with a random access radio network temporary identifier (RA-RNTI) that is based at least in part on an SSB index.

18. The network node of claim 11, wherein the one or more processors are further configured to cause the network node to: receive information indicating a user equipment (UE) capability to perform RAR monitoring associated with an RAR indicating an SSB index.

19. The network node of claim 11, wherein the one or more processors are further configured to cause the network node to: transmit information configuring RAR monitoring for a RACH configuration associated with multiple SSBs per RO.

20. A method of wireless communication performed by a user equipment (UE), comprising: transmitting, in a synchronization signal block (SSB) beam direction, at least one preamble in a random access channel (RACH) occasion (RO) associated with multiple SSBs; and monitoring, in the SSB beam direction, at least one search space for a random access response (RAR) associated with the at least one preamble.0097-5744PCT

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