Single frequency network random access channel beam refinement

Abstract

Various aspects of this disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may receive an indication from a base station that supports beamfinding for a single-frequency network (SFN) radio access channel (RACH). The UE may receive a transmission as part of RACH operation that enables or disables the SFN. Many other aspects are also provided.

Description

[0001] Cross-references to related applications

[0002] This patent application claims priority to U.S. nonprovisional patent application No. 17 / 115,394, filed on December 8, 2020, entitled “SINGLE FREQUENCY NETWORKRANDOM ACCESS CHANNEL BEAM REFINEMENT,” which is expressly incorporated herein by reference. Technical Field

[0003] Various aspects of this disclosure generally relate to wireless communication, and specifically to techniques and apparatus for beam refinement of random access channels in single-frequency networks. Background Technology

[0004] Wireless communication systems are widely deployed to provide a variety of telecommunications services, such as telephone, video, data, messaging, and broadcasting. Typical wireless communication systems employ multiple access technologies that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access technologies include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, Single Carrier Frequency Division Multiple Access (SC-FDMA) systems, Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems, and Long Term Evolution (LTE). LTE / LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard issued by the 3rd Generation Partnership Project (3GPP).

[0005] A wireless network may include several base stations (BSs) capable of supporting communication for multiple user equipments (UEs). UEs can communicate with the base stations (BSs) via downlinks and uplinks. A downlink (or forward link) refers to the communication link from the BS to the UE, while an uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a Node B, gNB, Access Point (AP), Radio Head, Transmit / Receive Point (TRP), New Radio (NR) BS, 5G Node B, etc.

[0006] These multiple access technologies have been adopted in various telecommunications standards to provide a common protocol enabling different user equipment to communicate at the municipal, national, regional, and even global levels. New Radio (NR), also known as 5G, is a set of enhancements to the LTE mobile standard issued by the 3rd Generation Partnership Project (3GPP). NR is designed to better support mobile broadband internet access by: improving spectrum efficiency, reducing costs, improving service, utilizing new spectrum, and better integrating with other open standards by using Orthogonal Frequency Division Multiplexing (OFDM) with Cyclic Prefix (CP) on the downlink (DL) and CP-OFDM and / or SC-FDM (e.g., also known as Discrete Fourier Transform Extended OFDM (DFT-s-OFDM)) on the uplink (UL), as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technologies and carrier aggregation. Further improvements to LTE, NR, and other radio access technologies remain useful as the demand for mobile broadband access continues to increase. Summary of the Invention

[0007] In some aspects, a method of wireless communication performed by a user equipment (UE) includes receiving an indication that the base station supports beamfinding of a single-frequency network (SFN) radio access channel (RACH); and, as part of RACH operation, receiving a transmission that enables or disables the SFN.

[0008] In some aspects, a method of wireless communication performed by a base station includes: transmitting an indication that the base station supports SFN RACH beamfinding; and, as part of RACH operation, transmitting a transmission that enables or disables SFN.

[0009] In some aspects, a UE for wireless communication includes: a memory; and one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: receive an indication that a base station supports SFN RACH beamfinding; and, as part of RACH operation, receive a transmission that enables or disables SFN.

[0010] In some aspects, a base station for wireless communication includes: a memory; and one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: transmit an indication that the base station supports SFN RACH beamfinding; and, as part of RACH operation, transmit a transmission that enables or disables SFN.

[0011] In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a UE, cause the UE to: receive an indication that a base station supports SFN RACH beamfinding; and, as part of RACH operation, receive a transmission that enables or disables SFN.

[0012] In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a base station, cause the base station to: transmit an indication that the base station supports SFN RACH beamfinding; and, as part of RACH operation, transmit a transmission that enables or disables SFN.

[0013] In some aspects, an apparatus for wireless communication includes: components for receiving an indication that a base station supports SFN RACH beamfinding; and components for receiving a transmission as part of RACH operation that enables or disables SFN.

[0014] In some aspects, an apparatus for wireless communication includes: components for transmitting an indication that the base station supports SFN RACH beam refinement; and components for transmitting a transmission as part of RACH operation, the transmission enabling or disabling SFN.

[0015] The aspects generally include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication equipment and / or processing systems as described herein with reference to the accompanying drawings and description.

[0016] The features and technical advantages of the examples according to this disclosure have been outlined quite extensively above to provide a better understanding of the following detailed description. Additional features and advantages will be described below. The disclosed concepts and specific examples can be readily used as a basis for modifications or designs to other structures used to achieve the same purpose of this disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein in terms of their organization and operation, as well as their associated advantages, will be better understood through the following description, taken in conjunction with the accompanying drawings. Each drawing is provided for illustrative and descriptive purposes and not as a limitation of the definitions in the claims. Attached Figure Description

[0017] To gain a more detailed understanding of the foregoing features of this disclosure, reference can be made to various aspects for a more specific description of the above-briefly summarized content, some of which are illustrated in the accompanying drawings. However, it should be noted that the drawings illustrate only certain typical aspects of this disclosure and should not be considered as limiting its scope, as the description may allow for other equally valid aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0018] Figure 1 The diagram illustrates an example of a wireless network in accordance with various aspects of this disclosure.

[0019] Figure 2 The illustrations are based on various aspects of this disclosure and illustrate an example of a base station communicating with a UE in a wireless network.

[0020] Figure 3 The diagram illustrates an example of a four-step random access process according to various aspects of this disclosure.

[0021] Figure 4 The illustrations are based on various aspects of this disclosure and illustrate examples associated with the transmission of synchronization signal blocks via a single-frequency network.

[0022] Figure 5 The illustrations are based on various aspects of this disclosure and illustrate examples associated with beam refinement of random access channels in single-frequency networks.

[0023] Figure 6 and Figure 7 The diagram illustrates an exemplary process associated with beam refinement of a random access channel in a single-frequency network, according to various aspects of this disclosure.

[0024] Figure 8 and Figure 9 This is a block diagram of an exemplary apparatus for wireless communication according to various aspects of this disclosure. Detailed Implementation

[0025] The various aspects of this disclosure are described more fully below with reference to the accompanying drawings. However, this disclosure may be implemented in many different forms and should not be construed as being limited to any specific structure or function given throughout this disclosure. Rather, these aspects are provided to make this disclosure thorough and complete, and to fully convey the scope of this disclosure to those skilled in the art. Based on the teachings herein, those skilled in the art will understand that the scope of this disclosure is intended to cover any aspect of this disclosure disclosed herein, whether implemented independently of any other aspect of this disclosure or in combination with any additional aspects of this disclosure. For example, any number of aspects set forth herein may be used to implement an apparatus or method of practice. Furthermore, the scope of this disclosure is intended to cover such apparatus or methods practiced using additional structures, functionalities, or structures and functionalities that complement or supplement the various aspects of this disclosure set forth herein. It should be understood that any aspect of this disclosure disclosed herein may be embodied by one or more elements of the claims.

[0026] Several aspects of a telecommunications system will now be presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively, “elements”). These elements can be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the entire system.

[0027] It should be noted that although the terms commonly associated with 5G or NR radio access technology (RAT) are used in this document to describe the aspects, the aspects of this disclosure can be applied to other RATs, such as 3G RAT, 4G RAT and / or RATs after 5G (e.g., 6G).

[0028] Figure 1 This is an illustration of an example of a wireless network 100 according to various aspects of this disclosure. Among other examples, the wireless network 100 may be or may include elements of a 5G (NR) network and / or an LTE network. The wireless network 100 may include several base stations 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A base station (BS) is an entity that communicates with a user equipment (UE) and may also be referred to as an NR BS, Node B, gNB, 5G Node B (NB), access point, Transmit / Receive Point (TRP), etc. Each BS may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to the coverage area of ​​a BS and / or the BS subsystem serving that coverage area, depending on the context in which the term is used.

[0029] A BS can provide communication coverage for macrocells, picocells, femtocells, and / or other types of cells. A macrocell can cover a relatively large geographic area (e.g., a radius of several kilometers) and allow unrestricted access for UEs with service subscriptions. A picocell can cover a relatively small geographic area and allow unrestricted access for UEs with service subscriptions. A femtocell can cover a relatively small geographic area (e.g., a residential area) and allow restricted access for UEs associated with that femtocell (e.g., UEs in a Closed Subscriber Group (CSG)). A BS used for macrocells can be referred to as a macro BS. A BS used for picocells can be referred to as a pico BS. A BS used for femtocells can be referred to as a femtocell BS or a home BS. Figure 1 In the example shown, BS 110a can be a macro BS for macro cell 102a, BS 110b can be a pico BS for pico cell 102b, and BS 110c can be a femto BS for femto cell 102c. A BS can support one or more (e.g., three) cells. The terms “eNB,” “base station,” “NR BS,” “gNB,” “TRP,” “AP,” “Node B,” “5G NB,” and “cell” are used interchangeably herein.

[0030] In some respects, the cell need not be stationary, and the geographical area of ​​the cell can move depending on the location of the mobile BS. In some respects, BSs can interconnect with each other and / or interconnect to one or more other BSs or network nodes (not shown) in the wireless network 100 via various types of backhaul interfaces (such as direct physical connections or virtual networks using any suitable transport network).

[0031] The wireless network 100 may also include a relay station. A relay station is an entity capable of receiving data transmissions from an upstream station (e.g., a BS or a UE) and transmitting data to a downstream station (e.g., a UE or a BS). A relay station can also be a UE capable of relaying transmissions for other UEs. Figure 1 In the example shown, relay BS 110d can communicate with macro BS 110a and UE 120d to facilitate communication between BS 110a and UE 120d. A relay BS can also be referred to as a relay station, relay base station, repeater, etc.

[0032] Wireless network 100 can be a heterogeneous network comprising different types of Base Stations (BSs) such as macro BSs, pico BSs, femto BSs, relay BSs, etc. These different types of BSs can have different transmit power levels, different coverage areas, and different effects on interference in wireless network 100. For example, macro BSs can have high transmit power levels (e.g., 5 to 40 watts), while pico BSs, femto BSs, and relay BSs can have lower transmit power levels (e.g., 0.1 to 2 watts).

[0033] Network controller 130 can be coupled to a collection of BSs and can provide coordination and control for these BSs. Network controller 130 can communicate with the BSs via backhaul. These BSs can also communicate with each other directly or indirectly, for example, via wireless or wired backhaul.

[0034] UE 120 (e.g., 120a, 120b, 120c) may be distributed throughout the wireless network 100, and each UE may be stationary or mobile. UE may also be referred to as an access terminal, terminal, mobile station, subscriber unit, station, etc. UE may be a cellular phone (e.g., smartphone), personal digital assistant (PDA), wireless modem, wireless communication device, handheld device, laptop computer, cordless phone, wireless local loop (WLL) station, tablet computer, camera, gaming device, netbook, smartbook, ultrabook, medical device or equipment, biometric sensor / device, wearable device (smartwatch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), entertainment device (e.g., music or video device, or satellite radio), vehicle component or sensor, smart meter / sensor, industrial manufacturing equipment, GPS device, or any other suitable device configured to communicate via wireless or wired media.

[0035] Some UEs can be considered machine-type communication (MTC) or evolved or enhanced machine-type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, instruments, monitors, and / or location tags that can communicate with a base station, another device (e.g., a remote device), or some other entity. Wireless nodes can provide connectivity to or to a network (e.g., a wide area network, such as the Internet or a cellular network) via wired or wireless communication links, for example. Some UEs can be considered Internet of Things (IoT) devices and / or can be implemented as NB-IoT (Narrowband Internet of Things) devices. Some UEs can be considered customer premises equipment (CPE). UE 120 can be included within a housing that houses the components of UE 120, such as processor components and / or memory components. In some aspects, the processor components and memory components can be coupled together. For example, the processor components (e.g., one or more processors) and memory components (e.g., memory) can be operatively coupled, communicatively coupled, electronically coupled, and / or electrically coupled.

[0036] Typically, any number of wireless networks can be deployed in a given geographical area. Each wireless network can support a specific RAT and can operate on one or more frequencies. A RAT can also be referred to as a radio technology, air interface, etc. A frequency can also be referred to as a carrier, frequency channel, etc. Each frequency can support a single RAT in a given geographical area to avoid interference between wireless networks using different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0037] In some respects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more sidelink channels (e.g., without using base station 110 as an intermediary). For example, UEs 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols or vehicle-to-infrastructure (V2I) protocols), and / or mesh networks. In this case, UEs 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as performed by base station 110.

[0038] Devices in the wireless network 100 can communicate using the electromagnetic spectrum, which can be subdivided into various categories, bands, channels, etc., based on frequency or wavelength. For example, devices in the wireless network 100 can communicate using an operating band with a first frequency range (FR1) and / or can communicate using an operating band with a second frequency range (FR2), the first frequency range spanning from 410 MHz to 7.125 GHz and the second frequency range spanning from 24.25 GHz to 52.6 GHz. The frequencies between FR1 and FR2 are sometimes referred to as mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, FR1 is generally referred to as the "sub-6 GHz" band. Similarly, FR2 is generally referred to as the "millimeter wave" band, although this differs from the extremely high frequency (EHF) band (30 GHz–300 GHz) designated as "millimeter wave" by the International Telecommunication Union (ITU). Therefore, unless otherwise specified, it should be understood that the terms "below 6 GHz," if used herein, can broadly refer to frequencies below 6 GHz, frequencies within FR1, and / or intermediate band frequencies (e.g., above 7.125 GHz). Similarly, unless otherwise specified, it should be understood that the terms "millimeter wave," if used herein, can broadly refer to frequencies within the EHF band, frequencies within FR2, and / or intermediate band frequencies (e.g., below 24.25 GHz). It is conceivable that the frequencies included in FR1 and FR2 can be modified, and the techniques described herein are applicable to those modified frequency ranges.

[0039] As mentioned above, Figure 1 This is provided as an example only. Other examples may differ from this combination. Figure 1 The content described.

[0040] Figure 2 The illustrations illustrate an example 200 of a base station 110 communicating with a UE 120 in a wireless network 100, according to various aspects of this disclosure. The base station 110 may be equipped with T antennas 234a to 234t, while the UE 120 may be equipped with R antennas 252a to 252r, wherein typically, T ≥ 1 and R ≥ 1.

[0041] At base station 110, transmitting processor 220 can receive data for one or more UEs from data source 212, select one or more modulation and decoding schemes (MCS) for each UE based at least in part on the Channel Quality Indicator (CQI) received from each UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS selected for the UE, and provide data symbols for all UEs. Transmitting processor 220 can also process system information (e.g., semi-static resource allocation information (SRPI)) and control information (e.g., CQI requests, grants, and / or upper-layer signaling), and provide overhead symbols and control symbols. Transmitting processor 220 can also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS) or demodulation reference signals (DMRS)) and synchronization signals (e.g., primary synchronization signal (PSS) or secondary synchronization signal (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols, where applicable, and can provide T output symbol streams to T modulators (MODs) 232a to 232t. Each modulator 232 can process a corresponding output symbol stream (e.g., for OFDM) to obtain an output sample stream. Each modulator 232 can also process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a to 232t can be transmitted via T antennas 234a to 234t, respectively.

[0042] At UE 120, antennas 252a to 252r can receive downlink signals from base station 110 and / or other base stations, and can provide the received signals to demodulators (DEMODs) 254a to 254r respectively. Each demodulator 254 can adjust (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain an input sample. Each demodulator 254 can further process the input sample (e.g., for OFDM) to obtain a received symbol. MIMO detector 256 can obtain the received symbols from all R demodulators 254a to 254r, perform MIMO detection on these received symbols where applicable, and provide the detected symbols. Receive processor 258 can process (e.g., demodulate and decode) the detected symbols, provide the decoded data for UE 120 to data sink 260, and provide the decoded control information and system information to controller / processor 280. The term "controller / processor" can refer to one or more controllers, one or more processors, or a combination thereof. Among other examples, the channel processor may determine the Reference Signal Received Power (RSRP) parameter, the Received Signal Strength Indicator (RSSI) parameter, the Reference Signal Received Quality (RSRQ) parameter, and / or the Channel Quality Indicator (CQI) parameter. In some respects, one or more components of the UE 120 may be included in the housing 284.

[0043] Network controller 130 may include communication unit 294, controller / processor 290, and memory 292. Network controller 130 may include one or more devices, such as those in a core network. Network controller 130 may communicate with base station 110 via communication unit 294.

[0044] Among other examples, antennas (e.g., antennas 234a to 234t and / or antennas 252a to 252r) may include one or more antenna panels, antenna groups, collections of antenna elements, and / or antenna arrays, or may be included within one or more antenna panels, antenna groups, collections of antenna elements, and / or antenna arrays. Antenna panels, antenna groups, collections of antenna elements, and / or antenna arrays may include one or more antenna elements. Antenna panels, antenna groups, collections of antenna elements, and / or antenna arrays may include collections of coplanar antenna elements and / or collections of non-coplanar antenna elements. Antenna panels, antenna groups, collections of antenna elements, and / or antenna arrays may include antenna elements within a single housing and / or antenna elements within multiple housings. Antenna panels, antenna groups, collections of antenna elements, and / or antenna arrays may include antenna elements coupled to one or more transmitting and / or receiving components (such as...) Figure 2 One or more antenna elements (one or more components).

[0045] On the uplink, at UE 120, the transmitting processor 264 can receive and process data from data source 262 and control information from controller / processor 280 (e.g., reports including RSRP, RSSI, RSRQ, and / or CQI). The transmitting processor 264 can also generate reference symbols for one or more reference signals. If applicable, the symbols from the transmitting processor 264 can be pre-decoded by the TX MIMO processor 266, further processed by modulators 254a to 254r (e.g., for DFT-s-OFDM or CP-OFDM), and transmitted to base station 110. In some aspects, the modulator and demodulator of UE 120 (e.g., MOD / DEMOD 254) can be included in the modem of UE 120. In some aspects, UE 120 includes a transceiver. The transceiver may include any combination of antenna 252, modulator and / or demodulator 254, MIMO detector 256, receive processor 258, transmit processor 264 and / or TX MIMO processor 266. The transceiver may be used by a processor (e.g., controller / processor 280) and memory 282 to perform aspects of any of the methods described herein (e.g., as referenced). Figure 5-7 (Description of aspects).

[0046] At base station 110, uplink signals from UE 120 and other UEs can be received by antenna 234, processed by demodulator 232, detected by MIMO detector 236 where applicable, and further processed by receiver processor 238 to obtain decoded data and control information transmitted by UE 120. Receiver processor 238 can provide the decoded data to data sink 239 and the decoded control information to controller / processor 240. Base station 110 may include communication unit 244 and communicate with network controller 130 via communication unit 244. Base station 110 may include scheduler 246 to schedule UE 120 for downlink and / or uplink communication. In some aspects, the modulator and demodulator (e.g., MOD / DEMOD 232) of base station 110 may be included in the modem of base station 110. In some aspects, base station 110 includes transceiver. The transceiver may include any combination of antenna 234, modulator and / or demodulator 232, MIMO detector 236, receive processor 238, transmit processor 220, and / or TX MIMO processor 230. The transceiver may be used by a processor (e.g., controller / processor 240) and memory 242 to perform aspects of any of the methods described herein (e.g., as referenced). Figure 5-7 (Description of aspects).

[0047] The controller / processor 240 of base station 110, the controller / processor 280 of UE 120 and / or Figure 2 Any other components may perform one or more techniques associated with beamforming of random access channels in a single-frequency network, as described in more detail elsewhere herein. For example, the controller / processor 240 of base station 110, the controller / processor 280 of UE 120, and / or Figure 2 Any other component can execute or direct, for example Figure 6 Process 600 Figure 7 The operation of process 700 and / or other processing described herein. Memory 242 and 282 may store data and program code for base station 110 and UE 120, respectively. In some aspects, memory 242 and / or memory 282 may include a non-transitory computer-readable medium storing one or more instructions (e.g., code and / or program code) for wireless communication. For example, one or more instructions, when executed by one or more processors of base station 110 and / or UE 120 (e.g., directly, or after compilation, translation, and / or interpretation), may cause one or more processors, UE 120, and / or base station 110 to perform or direct, for example... Figure 6 Process 600 Figure 7 The operation of process 700 and / or other processes as described herein. In some aspects, among other examples, execution instructions may include run instructions, transform instructions, compile instructions, and / or interpret instructions.

[0048] In some aspects, the UE includes components for receiving an indication that the base station supports SFN RACH beamfinding (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller / processor 280, and / or memory 282, among other examples); or components for receiving a transmission as part of RACH operation that enables or disables SFN (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller / processor 280, memory 282, transmit processor 264, TX MIMO processor 266, MOD 254, and / or antenna 252, among other examples). Components for the UE to perform the operations described herein may include one or more of, for example, antenna 252, demodulator 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, modulator 254, controller / processor 280, or memory 282.

[0049] In some aspects, the UE includes components for receiving a synchronization signal block (SSB) associated with RACH beamfinding and enabling SFN, components for transmitting RACH messages associated with the SSB, and components for determining, at least in part, based on the SSB enabling SFN, that subsequent RACH messages will be transmitted by the base station via SFN using multiple TRPs associated with the base station.

[0050] In some aspects, the UE includes components for receiving an SSB associated with RACH beamfinding and without enabling SFN, components for transmitting a first RACH message associated with the SSB, and components for transmitting a second RACH message indicating a SFN-based beam requested for a subsequent RACH message.

[0051] In some aspects, the UE includes components for receiving an SSB associated with RACH beam refinement and without enabling SFN, components for transmitting a first RACH message associated with the SSB, components for transmitting a second RACH message indicating a plurality of SFN-based beams requested for subsequent RACH messages, and components for receiving the subsequent RACH message via the plurality of SFN-based beams.

[0052] In some aspects, the UE includes components for receiving one or more SSBs associated with RACH beamfinding and without enabling SFN, components for transmitting a set of RACH messages associated with the one or more SSBs via one or more RACH timings, and components for receiving subsequent RACH messages via SFN-based beaming.

[0053] In some aspects, the UE includes components for transmitting the set of RACH messages at least in part based on a configured preamble hopping sequence that indicates the set of RACH messages is associated with the UE, or components for transmitting the set of RACH messages at least in part based on a configured frequency hopping sequence that indicates the set of RACH messages is associated with the UE.

[0054] In some aspects, the base station includes components for transmitting an indication that the base station supports SFN RACH beamfinding (e.g., using controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD / DEMOD 232, antenna 234, and / or memory 242, among other examples); or components for transmitting a transmission as part of RACH operation that enables or disables SFN (e.g., using controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD / DEMOD 232, antenna 234, memory 242, MIMO detector 236, and / or receive processor 238, among other examples). For example, components for the base station to perform the operations described herein may include one or more of transmit processor 220, TX MIMO processor 230, modulator 232, antenna 234, demodulator 232, MIMO detector 236, receive processor 238, controller / processor 240, memory 242, or scheduler 246.

[0055] In some aspects, the base station includes components for transmitting an SSB associated with RACH beamfinding and enabling SFN, components for receiving RACH messages associated with the SSB, and components for transmitting subsequent RACH messages via SFN using multiple TRPs, at least in part, based on the SSB enabling SFN.

[0056] In some aspects, the base station includes components for transmitting an SSB associated with RACH beamfinding and without enabling SFN, components for receiving a first RACH message associated with the SSB, and components for receiving a second RACH message indicating an SFN-based beam requested for a subsequent RACH message.

[0057] In some aspects, the base station includes components for transmitting an SSB associated with RACH beam refinement and without enabling SFN, components for receiving a first RACH message associated with the SSB, components for receiving a second RACH message indicating a plurality of SFN-based beams requested for subsequent RACH messages, and components for transmitting the subsequent RACH message via the plurality of SFN-based beams.

[0058] In some aspects, the base station includes components for transmitting one or more SSBs associated with RACH beamfinding and without enabling SFN, components for receiving a set of RACH messages associated with the one or more SSBs via one or more RACH timings, and components for determining the set of RACH messages associated with a single UE.

[0059] In some aspects, the base station includes components for determining, at least in part, that the set of RACH messages is associated with a single UE based on one or more of the following: components for receiving the set of RACH messages having a configured preamble hopping sequence, or components for receiving the set of RACH messages having a configured frequency hopping sequence.

[0060] Although Figure 2 The boxes in the diagram are illustrated as different components, but the functions described above with respect to the boxes can be implemented in a single hardware, software, or combined component, or in various combinations of components. For example, the functions described for the transmit processor 264, receive processor 258, and / or TX MIMO processor 266 can be performed by or under the control of the controller / processor 280.

[0061] As mentioned above, Figure 2 This is provided as an example only. Other examples may differ from this combination. Figure 2 The content described.

[0062] Figure 3 This is a diagram illustrating an example of a four-step random access process based on various aspects of this disclosure. For example... Figure 3 As shown, the base station and UE can communicate with each other to perform a 4-step random access procedure.

[0063] As shown by reference numeral 305 in the attached figure, the base station may transmit one or more SSBs and random access configuration information, and the UE may receive this information. In some aspects, the random access configuration information may be transmitted and / or indicated by system information (e.g., in one or more System Information Blocks (SIBs)) and / or SSBs, such as for contention-based random access. Alternatively or additionally, the random access configuration information may be transmitted in Radio Resource Control (RRC) messages and / or Physical Downlink Control Channel (PDCCH) command messages that trigger RACH procedures (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 Random Access Message (RAM), one or more parameters for receiving a Random Access Response (RAR), etc.

[0064] As shown by reference numeral 310 in the attached figure, the UE can transmit RAM that may include a preamble (sometimes called a random access preamble, physical RACH (PRACH) preamble, RAM preamble, etc.). During the four-step random access process, the message including the preamble may be referred to as Message 1, msg1, MSG1, first message, initial message, etc. The random access message may include a random access preamble identifier.

[0065] As shown by reference numeral 315 in the attached figure, the base station may send a RAR as a response to the preamble. In the four-step random access process, the message including the RAR may be referred to as message 2, msg2, MSG2, or the second message. In some aspects, the RAR may indicate the detected random access preamble identifier (e.g., received from the UE in msg1). Alternatively or additionally, the RAR may indicate the resource allocation to be used by the UE to send message 3 (msg3).

[0066] In some respects, as part of the second step of the four-step random access procedure, the base station may transmit PDCCH communications for the RAR. The PDCCH communications can schedule Physical Downlink Shared Channel (PDSCH) communications that include the RAR. For example, the PDCCH communications can indicate resource allocation for the PDSCH communications. Furthermore, as part of the second step of the four-step random access procedure, the base station may transmit PDSCH communications for the RAR according to the scheduling of the PDCCH communications. The RAR may be included in the Media Access Control (MAC) Protocol Data Unit (PDU) of the PDSCH communications.

[0067] As shown by reference numeral 320 in the attached figure, the UE can send an RRC connection request message. The RRC connection request message may be referred to as message 3, msg3, MSG3, or the third message in the four-step random access procedure. In some aspects, the RRC connection request may include the UE identifier, uplink control information (UCI), physical uplink shared channel (PUSCH) communication (e.g., the RRC connection request), etc.

[0068] As shown by reference numeral 325 in the attached figure, the base station can send an RRC connection establishment message. The RRC connection establishment message may be referred to as message 4, msg4, MSG4, or the fourth message in the four-step random access procedure. In some aspects, the RRC connection establishment message may include the detected UE identifier, timing advance value, contention resolution information, etc. As shown by reference numeral 330 in the attached figure, if the UE successfully receives the RRC connection establishment message, the UE can send a Hybrid Automatic Repeat Request (HARQ) acknowledgment (ACK).

[0069] As mentioned above, Figure 3 This is provided as an example only. Other examples may differ from this combination. Figure 3 The content described.

[0070] Figure 4 The illustrations illustrate various aspects of this disclosure, showing an example 400 associated with SSB transmission via a single-frequency network. For example... Figure 4As shown, a base station, multiple TRPs, and a UE can communicate via a wireless network. The base station can provide an SFN (Single-Frequency Number) via multiple TRPs. For example, the base station can configure multiple TRPs to communicate with the UE and / or other UEs using the same time-frequency resources to send and / or receive the same data sets. Based at least in part on the base station providing the SFN, the UE can communicate with the base station using the same time-frequency resources via one or more of the multiple TRPs. The multiple TRPs may be associated with the base station and / or may have the same Physical Cell Identifier (PCI).

[0071] As shown by reference numeral 405, among other examples, the base station may provide SSB information to the first TRP, the second TRP, and the third TRP. Among other examples, the SSB information may include system information (e.g., associated with the Master Information Block (MIB)) and / or synchronization information. The SSB information may include information required by the UE to establish a connection with the base station.

[0072] As shown by reference numeral 410 in the figure, the first TRP can transmit SSB (e.g., including SSB information) via the transmit beam of the first TRP, and the UE can receive the SSB via the first receive beam of the UE.

[0073] As shown by reference numeral 415 in the figure, the second TRP can transmit SSB (e.g., including SSB information) via the transmit beam of the second TRP, and the UE can receive the SSB via the second receive beam of the UE.

[0074] The UE can initiate a RACH procedure using SSB information received from the first TRP and the second TRP to establish a connection with the base station via either the first or second TRP. However, in some networks where the base station provides SFN to compensate for channel conditions and / or mobility conditions (e.g., in high-speed scenarios), the UE and / or base station may have difficulty performing the RACH procedure via the first or second TRP. For example, the base station may not be able to receive the RACH message from the UE and / or the UE may not be able to receive the RACH message from the base station. The RACH procedure may fail, at least in part, due to the base station and / or the UE not receiving the RACH message, and the UE may be unable to establish a connection with the base station. The UE and / or base station may consume additional resources to repeatedly attempt to establish a connection with the base station via the RACH procedure using the first or second TRP.

[0075] As mentioned above, Figure 4 This is provided as an example only. Other examples may differ from this combination. Figure 4 The content described.

[0076] In some aspects described herein, the base station may indicate support for SFN RACH beam refinement in the RACH configuration information. Among other examples, the base station may indicate support in the System Information Block (SIB) and / or SSB. In some aspects, the UE may receive the SIB and / or SSB and may use the indication of support for SFN RACH beam refinement to determine whether to use SFN configurations from multiple TRPs to send RACH messages. In some aspects, the base station and UE may communicate RACH messages with a reduced error probability, at least in part, based on the gain associated with the SFN. This can reduce failed attempts by the UE to establish a connection with the base station, which can save power, network, communication, and / or computing resources that might otherwise have been used for repeated attempts to establish a connection with the base station via the RACH procedure through a first TRP or a second TRP.

[0077] Figure 5 The illustrations provided illustrate, according to various aspects of this disclosure, an example 500 relating to beam refinement of a random access channel in a single-frequency network. For example... Figure 5 As shown, a UE (e.g., UE 120) can communicate with a base station (e.g., base station 110). The UE and the base station can be part of a wireless network (e.g., wireless network 100). In some aspects, the UE and the base station can perform one or more beam management procedures.

[0078] As shown by reference numeral 505 in the attached figure, the base station can transmit and the UE can receive one or more SSBs from one or more TRPs and / or an indication that the base station supports SFN RACH beam refinement.

[0079] In some aspects, the one or more SSBs may include an indication that the base station supports SFN RACH beam refinement. In some aspects, receiving one or more SSBs may include receiving a transmission (e.g., including information for the UE to initiate a RACH procedure) as part of RACH operation, wherein the transmission (e.g., one or more SSBs) enables or disables SFN. In some aspects, the one or more SSBs may include an indication that the base station supports SFN RACH beam refinement. For example, one or more SSBs may include explicit indications of base station support for SFN RACH beam refinement (e.g., flags and / or bit-based indicators, among other examples) and / or may include implicit indications of base station support for SFN RACH beam refinement (e.g., implied at least in part based on an SSB indicating that SFN is enabled).

[0080] In some aspects, an indication that the receiving base station supports SFN RACH beamfinding may include receiving a transmission (e.g., including information for the RACH procedure) as part of RACH operation, wherein the transmission enables or disables SFN. For example, the indication may include an implicit indication that SFN is enabled and / or may include an explicit indication that SFN is enabled.

[0081] In some aspects, one or more SSBs may provide information that the UE can use to obtain synchronization with the base station and / or locate additional resources for obtaining system information blocks (e.g., SIBs, such as SIB1). This one or more SSBs, SIBs, and / or other information may include RACH configuration information. In some aspects, the RACH configuration information may indicate support for SFN RACH beam refinement by indicating a RACH configuration that includes SFN RACH beam refinement. In some aspects, the RACH configuration information may indicate support for SFN RACH beam refinement explicitly by, for example, using a single-bit flag or a multi-bit flag within the configuration information.

[0082] In some implementations, support for SFN RACH beam refinement can be SSB-specific. In other words, RACH configuration information can indicate support for SFN RACH beam refinement for a specific SSB (e.g., on the beam associated with that specific SSB). In some aspects, a base station may support SFN RACH beam refinement for a first set of SSBs, while not supporting it for a second set of SSBs.

[0083] In some aspects, a base station may transmit a first set of SSBs using a single TRP (e.g., in a non-SFN configuration). In some aspects, a base station may transmit a second set of SSBs using multiple TRPs (e.g., in an SFN configuration). In some aspects, one or more SSBs in the first or second set of SSBs may include an indication of support for SFN RACH beamfining.

[0084] Among other examples, RACH configuration information may include RACH resources, RACH type (e.g., 2-step RACH or 4-step RACH), and / or whether the base station supports SFN RACH beamfining, repetition for transmitting RACH messages, and / or an indication of beam scanning for RACH messages.

[0085] SFN RACH beam refinement may include a RACH procedure during which the base station and / or UE initiate communication using SFN downlink transmission (e.g., using multiple TRPs) with a rough beam (e.g., a relatively wide beam and / or multiple beams spanning a relatively wide area (e.g., using beam scanning)). During the operation of the RACH procedure, the base station and / or UE may determine a refined beam (e.g., a relatively narrow beam and / or a beam with an improved configuration supporting SFN-based transmission and / or reception) for subsequent communication (e.g., subsequent communication associated with one or more TRPs). In some aspects, the base station and / or UE may determine the relatively narrow beam to be used for subsequent communication based at least in part on feedback from the UE and / or base station regarding previous communication (e.g., using a rough beam).

[0086] As indicated by reference numeral 510 in the attached figure, the UE can determine whether the base station supports SFN RACH beamfinding. In some aspects, the UE can determine whether the base station supports SFN RACH beamfinding based at least in part on an indication from the base station. In some aspects, among other examples, the UE can identify the indication within the SSB and / or SIB1.

[0087] As shown by reference numeral 515 in the attached figure, the UE can determine whether the base station wants to transmit one or more subsequent RACH messages (e.g., downlink RACH messages) via SFN transmission. In some aspects, the UE can determine, at least in part, based on indications from the base station, that one or more subsequent RACH messages should be transmitted via SFN transmission, via multiple TRPs associated with the base station.

[0088] In some respects, the SSB can indicate support for SFN RACH beamfinding. In other respects, the SSB can indicate (e.g., via a flag) that the SSB associated with RACH beamfinding is transmitted via SFN (e.g., SFN is enabled). The UE can determine, at least in part, based on the SSB that enables SFN, that one or more subsequent RACH messages (e.g., downlink RACH messages) transmitted by the base station will be transmitted via SFN using multiple TRPs. For example, a second RACH message (e.g., msg2) transmitted by the base station in response to a first RACH message (e.g., msg1) will be transmitted via SFN. Alternatively, a fourth RACH message (e.g., msg4) transmitted by the base station in response to a third RACH message (e.g., msg3) will be transmitted via SFN.

[0089] In some respects, the SSB can indicate support for SFN RACH beam refinement and can indicate (e.g., via a flag) that the SSB associated with RACH beam refinement is not transmitted via SFN (e.g., SFN is not enabled). The UE can determine that the fourth RACH message is to be transmitted via SFN using multiple TRPs. The UE can determine that it needs to provide feedback to the base station in the third RACH message to indicate one or more beams to be used for transmitting the fourth RACH message via SFN.

[0090] As shown by reference numeral 520, a UE can transmit and a base station can receive one or more first RACH messages (e.g., msg1) associated with at least one of one or more SSBs. In some aspects, the first RACH message can be associated with an SSB (e.g., an SFN-based SSB or a non-SFN-based SSB). In some aspects, multiple first RACH messages can be associated with corresponding SSBs. In some aspects, each first RACH message is associated with a single SSB, which can be an SFN-based SSB or a non-SFN-based SSB.

[0091] In some respects, a UE may use multiple RACH timings (e.g., resources associated with the resources used by the UE to send the first RACH message) to send multiple first RACH messages (e.g., msg1). A UE may send multiple first RACH messages within a RACH response (e.g., a random access response (RAR)) window associated with the RACH timing and / or the associated beam.

[0092] In some aspects, the UE may transmit multiple first RACH messages (e.g., a set of RACH messages) at least in part based on a configured preamble hopping sequence, wherein the configured preamble hopping sequence indicates that multiple first RACH messages are associated with the UE. In some aspects, among other examples, the UE may configure a preamble hopping sequence during a previous connection via a configured telecommunications standard and / or one or more RRC messages. The preamble hopping sequence may indicate the preamble to be selected by the UE for transmission with the multiple first RACH messages. In some aspects, the preamble of a first message in the multiple first RACH messages may have a configured relationship with the preamble of a second message in the multiple first RACH messages. In some aspects, the preamble of a second message in the multiple first RACH messages may have a configured relationship with the preamble of a third message in the multiple first RACH messages, and so on.

[0093] In some aspects, the UE may transmit multiple first RACH messages (e.g., a set of RACH messages) at least in part based on a configured frequency hopping sequence, wherein the configured frequency hopping sequence indicates that multiple first RACH messages are associated with the UE. In some aspects, the UE may use a configured frequency hopping scheme at least in part based on the associated RACH timing being frequency division multiplexing (e.g., simultaneous on different frequencies). In some aspects, among other examples, the UE may configure a frequency hopping sequence during a previous connection via a configured telecommunications standard and / or one or more RRC messages. The frequency hopping sequence may indicate the frequency to be selected by the UE for transmitting multiple first RACH messages during one or more RACH timings. In some aspects, the frequency of a first message in the multiple first RACH messages may have a configured relationship with the frequency of a second message in the multiple first RACH messages. The frequency of a second message in the multiple first RACH messages may have a configured relationship with the frequency of a third message in the multiple first RACH messages, and so on.

[0094] As shown by reference numeral 525, a base station can determine that one or more first RACH messages originate from a single UE. In some aspects, the base station can determine that the one or more first RACH messages originate from a single UE based at least in part on the determination that the one or more first RACH messages have a configured preamble hopping sequence and / or a configured frequency hopping sequence.

[0095] As shown by reference numeral 530, the UE can receive and the base station can transmit a second RACH message (e.g., msg2). In some aspects, the base station can use SFN-based transmissions (e.g., using multiple TRPs) to transmit the second RACH message. In other aspects, the base station can use non-SFN-based transmissions (e.g., using a single TRP) to transmit the second RACH message.

[0096] As shown by reference numeral 535 in the attached figure, the UE can transmit, and the base station can receive, a third RACH message and / or an indication of a preferred beam for a fourth RACH message (e.g., msg4). In some aspects, the UE can use the beam associated with the second RACH message to transmit the third RACH message. In some aspects, the beam associated with the second RACH message can be associated with an SSB in one or more SSBs.

[0097] In some aspects, the UE may transmit an indication of a preferred beam for a fourth RACH message based at least in part on measurements of the second RACH message. In some aspects, the preferred beam for the fourth RACH message may be a relatively narrow beam (e.g., a beam narrower than the beam used for the second RACH message). In some aspects, the preferred beam may be associated with an SFN-based beam to be transmitted using multiple TRPs.

[0098] In some aspects, the UE may send indications of multiple preferred beams for the fourth RACH message. In other aspects, the UE may indicate its preference for using SFN-based transmission to send the fourth RACH message for the base station using at least one of the multiple preferred beams (e.g., using multiple TRPs).

[0099] As indicated by reference numeral 540, the UE can receive and the base station can transmit a fourth RACH message (e.g., msg4). The fourth RACH message may include an RRC connection establishment message. In some aspects, the base station may use an SFN-based beam associated with a preferred beam as indicated by the UE to transmit the fourth RACH message. In some aspects, the base station may use an SFN-based beam associated with at least one preferred beam as indicated by the UE (e.g., using multiple preferred beams) to transmit the fourth RACH message.

[0100] As shown by reference numeral 545 in the attached figure, the UE can send a Hybrid Automatic Repeat Request Acknowledgment (HARQ ACK), and the base station can receive the HARQ ACK. In some aspects, the UE can send a HARQ ACK to indicate successful reception of a fourth RACH message. Based at least in part on the UE sending a HARQ ACK message, the base station can determine that the UE RACH procedure was successful and that the UE is configured for subsequent communication.

[0101] Based at least in part on SFN-based transmissions using RACH messages, the base station and UE can communicate RACH messages with a reduced error probability, based at least in part on the gain associated with SFN. This can reduce failed attempts by the UE to establish a connection with the base station, which can save power, network, communication, and / or computing resources that might otherwise have been used for repeated attempts to establish a connection with the base station using the RACH procedure via the first TRP or the second TRP.

[0102] As mentioned above, Figure 5 This is provided as an example only. Other examples may differ from this combination. Figure 5 The content described.

[0103] Figure 6 This is a diagram illustrating an exemplary process 600 performed by a UE, for example, according to various aspects of this disclosure. Exemplary process 600 is an example in which a UE (e.g., UE 120) performs operations associated with SFN RACH beamfinding.

[0104] like Figure 6 As shown, in some aspects, process 600 may include receiving an indication from the base station that it supports SFN RACH beam refinement (box 610). For example, the UE (e.g., using...) Figure 8 The receiving component 802 described above can receive an indication of whether the base station supports SFNRACH beamfining, as shown in the example above. Figure 5 As described.

[0105] like Figure 6 As further illustrated, in some aspects, process 600 may include receiving a transmission (box 620) as part of a RACH operation, which enables or disables the SFN. For example, a UE (e.g., using...) Figure 8 The receiving component 802 and / or transmitting component 804 depicted above can receive a transmission as part of a RACH operation, which enables or disables the SFN, as shown above, for example, in reference to [reference missing]. Figure 5 As described.

[0106] Process 600 may include other aspects, such as any single aspect or any combination of aspects as described below, and / or in combination with one or more other processes described elsewhere herein.

[0107] In the first aspect, the indication is associated with one or more synchronization signal blocks (SSBs).

[0108] In the second aspect, receiving a transmission that enables or disables SFN, either alone or in combination with the first aspect, includes receiving an SSB associated with RACH beamsharpening and that enables SFN, and wherein the method further includes transmitting a RACH message associated with the SSB, and determining, at least in part, based on the SSB that enables SFN, that subsequent RACH messages will be transmitted via SFN using multiple TRPs.

[0109] In a third aspect, receiving a transmission that enables or disables SFN, either alone or in combination with one or more of the first and second aspects, includes receiving an SSB associated with RACH beamfinding and not enabling SFN, and wherein the method further includes transmitting a first RACH message associated with the SSB and transmitting a second RACH message indicating a SFN-based beam requested for a subsequent RACH message.

[0110] In the fourth aspect, receiving a transmission that enables or disables SFN, either alone or in combination with one or more of the first to third aspects, includes receiving an SSB associated with RACH beamfinding and not enabling SFN, and wherein the method further includes transmitting a first RACH message associated with the SSB, transmitting a second RACH message indicating a plurality of SFN-based beams requested for subsequent RACH messages, and receiving the subsequent RACH messages via the plurality of SFN-based beams.

[0111] In the fifth aspect, receiving transmissions that enable or disable SFN, either alone or in combination with one or more of the first to fourth aspects, includes receiving one or more SSBs associated with RACH beamsharpening and that do not enable SFN, and wherein the method further includes transmitting a set of RACH messages associated with the one or more SSBs via one or more RACH timings, and receiving subsequent RACH messages via SFN-based beaming.

[0112] In the sixth aspect, transmitting a set of RACH messages associated with the one or more SSBs via the one or more RACH timings, either alone or in combination with one or more of the first to fifth aspects, includes: transmitting the set of RACH messages at least in part based on a configured preamble hopping sequence indicating that the set of RACH messages is associated with the UE, or transmitting the set of RACH messages at least in part based on a configured frequency hopping sequence indicating that the set of RACH messages is associated with the UE.

[0113] although Figure 6 The illustration shows an example block of process 600, but in some respects, process 600 may include... Figure 6 The boxes depicted in the diagram are compared to additional boxes, fewer boxes, different boxes, or boxes arranged differently. Alternatively, two or more boxes in process 600 may be executed in parallel.

[0114] Figure 7 This is a diagram illustrating an exemplary process 700 performed by a base station, for example, according to various aspects of this disclosure. Exemplary process 700 is an example in which a base station (e.g., base station 110) performs operations associated with beam refinement of a single-frequency network random access channel.

[0115] like Figure 7 As shown, in some aspects, process 700 may include an indication that the transmitting base station supports SFN RACH beam refinement (box 710). For example, the base station (e.g., using transmitting component 904, such as...) Figure 9 The description above indicates that the base station supports SFNRACH beam refinement, as shown in the reference above. Figure 5 As described.

[0116] like Figure 7 As further shown in the diagram, in some aspects, process 700 may include transmitting a transmission as part of RACH operation, which enables or disables the SFN (box 720). For example, a base station (e.g., using a transmitting component 904, such as...) Figure 9 The transmission described above (as described in the text) can be sent as part of a RACH operation, which enables or disables the SFN, as illustrated in the example above. Figure 5 As described.

[0117] Process 700 may include other aspects, such as any single aspect or any combination of aspects as described below, and / or in combination with one or more other processes described elsewhere herein.

[0118] In the first aspect, the indication is associated with one or more synchronization signal blocks (SSBs).

[0119] In the second aspect, transmission that enables or disables SFN, either alone or in combination with the first aspect, includes transmitting a synchronization signal block (SSB) associated with RACH beamfinding and enabling SFN, and wherein the method further includes receiving a RACH message associated with the SSB, and transmitting subsequent RACH messages via SFN transmission using multiple transmit-receive points (TRPs) based at least in part on the SSB that enables SFN.

[0120] In a third aspect, transmitting a transmission that enables or disables SFN, either alone or in combination with one or more of the first and second aspects, includes transmitting a synchronization signal block (SSB) associated with RACH beamfinding and not enabling SFN, and wherein the method further includes receiving a first RACH message associated with the SSB, and receiving a second RACH message indicating a SFN-based beam that is requested for a subsequent RACH message.

[0121] In the fourth aspect, transmitting a transmission that enables or disables SFN, either alone or in combination with one or more of the first to third aspects, includes transmitting a synchronization signal block (SSB) associated with RACH beamfinding and not enabling SFN, and wherein the method further includes receiving a first RACH message associated with the SSB, receiving a second RACH message indicating a plurality of SFN-based beams requested for subsequent RACH messages, and transmitting the subsequent RACH messages via the plurality of SFN-based beams.

[0122] In the fifth aspect, transmitting a transmission that enables or disables SFN, either alone or in combination with one or more of the first to fourth aspects, includes transmitting one or more synchronization signal blocks (SSBs) associated with RACH beamfinding and that do not enable SFN, and wherein the method further includes receiving a set of RACH messages associated with the one or more SSBs via one or more RACH timings, and determining that the set of RACH messages is associated with a single user equipment (UE).

[0123] In the sixth aspect, determining that the set of RACH messages is associated with a single UE, either alone or in combination with one or more of the first to fifth aspects, includes determining that the set of RACH messages is associated with a single UE based at least in part on one or more of the following: receiving the set of RACH messages with a configured preamble hopping sequence, or receiving the set of RACH messages with a configured frequency hopping sequence.

[0124] although Figure 7 The illustration shows an example block of process 700, but in some respects, process 700 may include... Figure 7 The boxes depicted in the diagram are compared to additional boxes, fewer boxes, different boxes, or boxes arranged differently. Alternatively, two or more boxes in process 700 may be executed in parallel.

[0125] Figure 8 This is a block diagram of an exemplary device 800 for wireless communication. Device 800 may be a UE, or a UE may include device 800. In some aspects, device 800 includes a receiving component 802 and a transmitting component 804, which can communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, device 800 can use the receiving component 802 and the transmitting component 804 to communicate with another device 806 (such as a UE, a base station, or another wireless communication device). As further shown, device 800 may include a determining component 808.

[0126] In some respects, device 800 can be configured to perform the functions described herein. Figure 5 One or more operations described herein. Alternatively or concurrently, the apparatus 800 may be configured to perform one or more processes described herein, such as Figure 6 The process is 600. In some respects, Figure 8 The device 800 and / or one or more components shown may include the above combination. Figure 2 One or more components of the UE as described. Alternatively or alternatively, Figure 8 One or more components shown can be combined above. Figure 2Implemented within one or more components described. Alternatively, one or more components in the set of components may be implemented at least partially as software stored in memory. 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 a controller or processor to perform the function or operation of the component.

[0127] Receiver 802 may receive communications from device 806, such as reference signals, control information, data communications, or combinations thereof. Receiver 802 may provide the received communications to one or more other components of device 800. In some aspects, receiver 802 may perform signal processing on the received communications (among other examples, such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding), and may provide the processed signal to one or more other components of device 806. In some aspects, receiver 802 may include combinations of the above. Figure 2 The described UE includes one or more antennas, demodulators, MIMO detectors, receiver processors, controllers / processors, memory, or combinations thereof.

[0128] Transmitting component 804 can transmit communications, such as reference signals, control information, data communications, or combinations thereof, to device 806. In some aspects, one or more other components of device 806 can generate communications and provide the generated communications to transmitting component 804 for transmission to device 806. In some aspects, transmitting component 804 can perform signal processing on the generated communications (among other examples, such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding), and can transmit the processed signals to device 806. In some aspects, transmitting component 804 can include combinations of the above. Figure 2 The described UE includes one or more antennas, modulators, transmit MIMO processors, transmit processors, controllers / processors, memory, or combinations thereof. In some aspects, the transmit component 804 may be co-located with the receive component 802 in a transceiver.

[0129] The receiving component 802 can receive an indication of whether the base station supports SFN RACH beam refinement. The receiving component 802 can receive a transmission as part of RACH operation that enables or disables SFN.

[0130] Component 808 determines, at least in part, based on the SSB that enables SFN, that subsequent RACH messages will be sent via SFN using multiple TRPs.

[0131] Figure 8 The number and arrangement of components shown are provided as an example. In reality, they can exist in combination with... Figure 8 The components shown are those that are additional, fewer, different, or arranged differently compared to other components. Furthermore, Figure 8 The two or more components shown can be implemented within a single component, or Figure 8 The single component shown can be implemented as multiple distributed components. Alternatively, Figure 8 The collection of components (one or more components) shown in the diagram can perform actions described by... Figure 8 Another set of components shown performs one or more functions.

[0132] Figure 9 This is a block diagram of an exemplary device 900 for wireless communication. Device 900 may be a base station, or a base station may include device 900. In some aspects, device 900 includes a receiving component 902 and a transmitting component 904, which can communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, device 900 can use the receiving component 902 and the transmitting component 904 to communicate with another device 906 (such as a UE, a base station, or another wireless communication device). As further shown, device 900 may include a determining component 908.

[0133] In some respects, device 900 can be configured to perform the functions described herein. Figure 5 One or more operations described herein. Alternatively or concurrently, device 900 may be configured to perform one or more processes described herein, such as Figure 7 The process is 700. In some respects, Figure 9 The device 900 and / or one or more components shown may include the above combination. Figure 2 One or more components of the described base station. Alternatively or concurrently, Figure 9 One or more components shown can be combined above. Figure 2 Implemented within one or more components described. Alternatively, one or more components in the set of components may be implemented at least partially as software stored in memory. 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 a controller or processor to perform the function or operation of the component.

[0134] Receiver 902 may receive communications from device 906, such as reference signals, control information, data communications, or combinations thereof. Receiver 902 may provide the received communications to one or more other components of device 900. In some aspects, receiver 902 may perform signal processing on the received communications (among other examples, such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding), and may provide the processed signals to one or more other components of device 906. In some aspects, receiver 902 may include combinations of the above. Figure 2 The described BS includes one or more antennas, demodulators, MIMO detectors, receiver processors, controllers / processors, memory, or combinations thereof.

[0135] Transmitting component 904 can transmit communications, such as reference signals, control information, data communications, or combinations thereof, to device 906. In some aspects, one or more other components of device 906 can generate communications and provide the generated communications to transmitting component 904 for transmission to device 906. In some aspects, transmitting component 904 can perform signal processing on the generated communications (among other examples, such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding), and can transmit the processed signal to device 906. In some aspects, transmitting component 904 can include combinations of the above. Figure 2 The described base station includes one or more antennas, a modulator, a transmit MIMO processor, a transmit processor, a controller / processor, a memory, or a combination thereof. In some aspects, the transmit component 904 may be co-located with the receive component 902 in a transceiver.

[0136] Transmitting component 904 can transmit an indication that the base station supports SFN RACH beam refinement. Receiving component 902 and / or transmitting component 904 can transmit a transmission as part of RACH operation that enables or disables SFN.

[0137] Component 908 can determine that a set of RACH messages is associated with a single UE.

[0138] Figure 9 The number and arrangement of components shown are provided as an example. In reality, they can exist in combination with... Figure 9 The components shown are those that are additional, fewer, different, or arranged differently compared to other components. Furthermore, Figure 9 The two or more components shown can be implemented within a single component, or Figure 9 The single component shown can be implemented as multiple distributed components. Alternatively, Figure 9 The collection of (one or more) components shown can perform actions described by... Figure 9 Another set of components shown performs one or more functions.

[0139] The following provides an overview of the various aspects of this disclosure:

[0140] Aspect 1: A method of wireless communication performed by a user equipment (UE), the method comprising: receiving an indication that a base station supports beamfinding of a single-frequency network (SFN) radio access channel (RACH); and, as part of RACH operation, receiving a transmission that enables or disables the SFN.

[0141] Aspect 2: According to the method of aspect 1, wherein the indication is associated with one or more synchronization signal blocks (SSBs).

[0142] Aspect 3: The method according to any one of Aspects 1 to 2, wherein receiving a transmission that enables or disables SFN includes receiving a synchronization signal block (SSB) associated with RACH beamfinding and enabling SFN, and wherein the method further includes: transmitting a RACH message associated with the SSB, and determining, at least in part based on the SSB that enables SFN, that subsequent RACH messages should be transmitted via SFN using multiple transmit-receive points (TRPs).

[0143] Aspect 4: A method according to any one of Aspects 1 to 2, wherein receiving a transmission that enables or disables SFN includes receiving a synchronization signal block (SSB) associated with RACH beamfinding and not enabling SFN, and wherein the method further includes: transmitting a first RACH message associated with the SSB, and transmitting a second RACH message indicating a SFN-based beam requested for a subsequent RACH message.

[0144] Aspect 5: A method according to any one of Aspects 1 to 2, wherein receiving a transmission that enables or disables SFN includes receiving a synchronization signal block (SSB) associated with RACH beamfinding and not enabling SFN, and wherein the method further includes: transmitting a first RACH message associated with the SSB, transmitting a second RACH message indicating a plurality of SFN-based beams requested for subsequent RACH messages, and receiving the subsequent RACH messages via the plurality of SFN-based beams.

[0145] Aspect 6: The method according to any one of Aspects 1 to 2, wherein receiving a transmission that enables or disables SFN includes receiving one or more synchronization signal blocks (SSBs) associated with RACH beamfinding and not enabling SFN, and wherein the method further includes: transmitting a set of RACH messages associated with the one or more SSBs via one or more RACH timings, and receiving subsequent RACH messages via SFN-based beamforming.

[0146] Aspect 7: According to the method of aspect 6, wherein sending a set of RACH messages associated with the one or more SSBs via the one or more RACH timing includes: sending the set of RACH messages at least in part based on a configured preamble hopping sequence indicating that the set of RACH messages is associated with the UE, or sending the set of RACH messages at least in part based on a configured frequency hopping sequence indicating that the set of RACH messages is associated with the UE.

[0147] Aspect 8: A method of wireless communication performed by a base station, the method comprising: transmitting an indication that the base station supports single-frequency network (SFN) radio access channel (RACH) beamfinding; and, as part of RACH operation, transmitting a transmission that enables or disables the SFN.

[0148] Aspect 9: According to the method of aspect 8, wherein the indication is associated with one or more synchronization signal blocks (SSBs).

[0149] Aspect 10: A method according to any one of aspects 8 to 9, wherein transmitting a transmission that enables or disables SFN includes transmitting a synchronization signal block (SSB) associated with RACH beamfinding and enabling SFN, and wherein the method further includes: receiving a RACH message associated with the SSB, and transmitting subsequent RACH messages via SFN transmission using a plurality of transmit-receive points (TRPs) based at least in part on the SSB that enables SFN.

[0150] Aspect 11: A method according to any one of aspects 8 to 9, wherein transmitting a transmission that enables or disables SFN includes transmitting a synchronization signal block (SSB) associated with RACH beamfinding and not enabling SFN, and wherein the method further includes: receiving a first RACH message associated with the SSB, and receiving a second RACH message indicating a SFN-based beam requested for a subsequent RACH message.

[0151] Aspect 12: A method according to any one of aspects 8 to 9, wherein transmitting a transmission that enables or disables SFN includes transmitting a synchronization signal block (SSB) associated with RACH beamfinding and not enabling SFN, and wherein the method further includes: receiving a first RACH message associated with the SSB, receiving a second RACH message indicating a plurality of SFN-based beams requested for a subsequent RACH message, and transmitting the subsequent RACH message via the plurality of SFN-based beams.

[0152] Aspect 13: A method according to any one of Aspects 8 to 9, wherein transmitting a transmission that enables or disables SFN includes transmitting one or more synchronization signal blocks (SSBs) associated with RACH beamfinding and not enabling SFN, and wherein the method further includes: receiving a set of RACH messages associated with the one or more SSBs via one or more RACH timings, and determining that the set of RACH messages is associated with a single user equipment (UE).

[0153] Aspect 14: The method of claim 13, wherein determining that the set of RACH messages is associated with a single UE comprises: determining that the set of RACH messages is associated with a single UE based at least in part on one or more of the following: receiving a set of RACH messages having a configured preamble hopping sequence, or receiving a set of RACH messages having a configured frequency hopping sequence.

[0154] Aspect 15: An apparatus for wireless communication at a device, the apparatus comprising a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform one or more aspects of aspects 1-14.

[0155] Aspect 16: An apparatus for wireless communication, the apparatus including a memory and one or more processors coupled to the memory, the memory and the one or more processors being configured to perform methods of one or more aspects of aspects 1-14.

[0156] Aspect 17: An apparatus for wireless communication, the apparatus comprising at least one component for performing a method as described in one or more aspects of aspects 1-14.

[0157] Aspect 18: A non-transitory computer-readable medium storing code for wireless communication, the code including instructions executable by a processor to perform methods of one or more aspects of aspects 1-14.

[0158] Aspect 19: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions which, when executed by one or more processors of a device, cause the device to perform one or more aspects of aspects 1-14.

[0159] The foregoing disclosure provides explanations and descriptions, but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations may be made based on the foregoing disclosure, or from practice in this area.

[0160] As used herein, the term "component" is intended to be broadly interpreted as hardware and / or a combination of hardware and software. Among other examples, whether referring to software, firmware, middleware, microcode, hardware description languages, or others, "software" should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, and / or functions. As used herein, processors are implemented using hardware and / or a combination of hardware and software. It is clear that the systems and / or methods described herein can be implemented in various forms of hardware and / or combinations of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit any aspect. Therefore, the operation and behavior of these systems and / or methods are described herein without reference to any specific software code—it should be understood that software and hardware can be designed to implement these systems and / or methods, at least in part, based on the descriptions herein.

[0161] As used in this article, the threshold can refer to values ​​such as greater than the threshold, greater than or equal to the threshold, less than or equal to the threshold, or not equal to the threshold, depending on the context.

[0162] Although specific combinations of features are described in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of different aspects. In fact, many of these features can be combined in ways not specifically described in the claims and / or not disclosed in the specification. Although each dependent claim listed below may be directly subordinated to only one claim, the disclosure of different aspects includes each dependent claim being combined with each other claim in this set of claims. As used herein, the phrase “at least one of…” in the list of items refers to any combination of these items, including single members. As an example, “at least one of a, b, or c” is intended to cover: a, b, c, ab, ac, bc, and abc, as well as any combination having multiple identical elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other ordering of a, b, and c).

[0163] None of the elements, actions, or instructions used herein should be construed as essential or necessary unless explicitly stated otherwise. Furthermore, as used herein, the articles “a” and “one” are intended to include one or more items and are used interchangeably with “one or more.” Additionally, as used herein, the article “the” is intended to include one or more items referenced in connection with the article “the” and is used interchangeably with “the one or more.” Furthermore, as used herein, the terms “set” and “group” are intended to include one or more items (e.g., related items, unrelated items, combinations of related and unrelated items) and are used interchangeably with “one or more.” Where only one item is intended, the phrase “only one” or similar language is used. Moreover, as used herein, the terms “have,” “possess,” “contain,” etc., are intended to be open-ended terms. Furthermore, the phrase “based on” is intended to mean “at least partially based on” unless explicitly stated otherwise. Furthermore, as used herein, the term “or” is inclusive when used consecutively and may be used interchangeably with “and / or” unless otherwise explicitly stated (e.g., if used in combination with “either of both” or “only one of…”).

Claims

1. A method for wireless communication performed by a user equipment (UE), comprising: The receiving base station indicates that the first set of synchronization signal blocks (SSBs) supports RACH beam refinement for single-frequency network random access channel (SFN) and the second set of SSBs does not support SFN RACH beam refinement. as well as As part of RACH operation, one or more SSBs are received, which are associated with RACH beamfinding and enable or disable SFN, and the one or more SSBs are included in a first set of SSBs or a second set of SSBs.

2. The method of claim 1, wherein the indication is associated with the one or more synchronization signal blocks (SSBs).

3. The method of claim 1, wherein receiving the one or more SSBs that enable or disable SFN comprises receiving an SSB associated with RACH beamfinding and that enables SFN, and The method further includes: Send a RACH message associated with the SSB, and Based at least in part on the SSB that enables SFN, it is determined that subsequent RACH messages will be transmitted via SFN using multiple sender-receiver points (TRPs).

4. The method of claim 1, wherein receiving the one or more SSBs that enable or disable SFN comprises receiving an SSB associated with RACH beamfinding and that does not enable SFN, and The method further includes: Send the first RACH message associated with the SSB, and Send a second RACH message based on the SFN beam, which is requested to be used for subsequent RACH messages.

5. The method of claim 1, wherein receiving the one or more SSBs that enable or disable SFN comprises receiving an SSB associated with RACH beamfinding and that does not enable SFN, and The method further includes: Send the first RACH message associated with the SSB. The transmission indicates that a second RACH message based on multiple SFN beams has been requested for use in subsequent RACH messages, and The subsequent RACH message is received via the plurality of SFN-based beams.

6. The method of claim 1, wherein receiving the one or more SSBs that enable or disable SFN comprises receiving one or more SSBs associated with RACH beamfinding and that do not enable SFN, and The method further includes: A set of RACH messages associated with the one or more SSBs sent via one or more RACH timings, and Subsequent RACH messages are received via SFN-based beamforming.

7. The method of claim 6, wherein sending the set of RACH messages associated with the one or more SSBs via the one or more RACH timings comprises: The set of RACH messages is transmitted at least in part based on a configured preamble transition sequence, the configured preamble transition sequence indicating that the set of RACH messages is associated with the UE, or The set of RACH messages is transmitted at least in part based on a configured frequency hopping sequence, which indicates that the set of RACH messages is associated with the UE.

8. A method for wireless communication performed by a base station, comprising: The base station sends an indication that the first set of Synchronization Signal Blocks (SSBs) supports SFN Random Access Channel (RACH) beam refinement and the second set of SSBs does not support SFN RACH beam refinement. as well as As part of RACH operation, one or more SSBs are transmitted, which are associated with RACH beamfinding and enable or disable SFN, and the one or more SSBs are included in a first set of SSBs or a second set of SSBs.

9. The method of claim 8, wherein the indication is associated with the one or more synchronization signal blocks (SSBs).

10. The method of claim 8, wherein transmitting the one or more SSBs that enable or disable SFN comprises transmitting an SSB associated with RACH beamfinding and enabling SFN, and The method further includes: Receive the RACH message associated with the SSB, and Subsequent RACH messages are transmitted via SFN using multiple transmit / receive points (TRPs) at least in part, based on the SSB that enables SFN.

11. The method of claim 8, wherein transmitting the one or more SSBs that enable or disable SFN comprises transmitting an SSB associated with RACH beamfinding and that does not enable SFN, and The method further includes: Receive the first RACH message associated with the SSB, and The receiver indicates that the second RACH message based on the SFN beam is requested for use in subsequent RACH messages.

12. The method of claim 8, wherein transmitting the one or more SSBs that enable or disable SFN comprises transmitting an SSB associated with RACH beamfinding and that does not enable SFN, and The method further includes: Receive the first RACH message associated with the SSB. The receive indication is requested for subsequent RACH messages using multiple SFN-based beams in a second RACH message, and The subsequent RACH message is transmitted via the plurality of SFN-based beams.

13. The method of claim 8, wherein transmitting the one or more SSBs that enable or disable SFN comprises transmitting one or more SSBs associated with RACH beamfinding and that do not enable SFN, and The method further includes: A set of RACH messages associated with the one or more SSBs received via one or more RACH timings, and The set of RACH messages is determined to be associated with a single user equipment (UE).

14. The method of claim 13, wherein determining that the set of RACH messages is associated with a single UE comprises: The set of RACH messages is associated with a single UE based at least in part on one or more of the following: A set of RACH messages receiving a configured preamble transition sequence, or Receive a set of RACH messages with a configured frequency hopping sequence.

15. A user equipment (UE) for wireless communication, comprising: At least one memory including instructions; and One or more processors, the one or more processors being configured to execute the instructions to cause the UE to: The receiving base station indicates that the first set of synchronization signal blocks (SSBs) supports RACH beam refinement for single-frequency network random access channel (SFN) and the second set of synchronization signal blocks (SSBs) does not support SFN RACH beam refinement. as well as As part of RACH operation, one or more SSBs are received, which are associated with RACH beamfinding and enable or disable SFN, and the one or more SSBs are included in a first set of SSBs or a second set of SSBs.

16. The UE of claim 15, wherein the one or more processors are configured to execute the instructions to cause the UE to: Receive the instruction within the RACH configuration, or The instruction is received within the System Information Block (SIB).

17. The UE of claim 15, wherein the indication is associated with the one or more synchronization signal blocks (SSBs).

18. The UE of claim 15, wherein the one or more processors, in order to receive the one or more SSBs that enable or disable SFN, are configured to execute the instructions to cause the UE to receive the SSB associated with RACH beamfinding and to enable SFN, and The one or more processors are further configured to execute the instructions to cause the UE to: Send a RACH message associated with the SSB, and Based at least in part on the SSB that enables SFN, it is determined that subsequent RACH messages will be transmitted via SFN using multiple sender-receiver points (TRPs).

19. The UE of claim 15, wherein the one or more processors are configured to execute the instructions to cause the UE to: upon receiving the one or more SSBs that enable or disable the SFN. Receive SSBs associated with RACH beamfining and without enabling SFN, and The one or more processors are further configured to execute the instructions to cause the UE to: Send the first RACH message associated with the SSB, and The receiver indicates that the second RACH message based on the SFN beam is requested for use in subsequent RACH messages.

20. The UE of claim 15, wherein the one or more processors, in order to receive the one or more SSBs that enable or disable SFN, are configured to execute the instructions to cause the UE to receive an SSB associated with RACH beamfinding and that does not enable SFN, and The one or more processors are further configured to execute the instructions to cause the UE to: Send the first RACH message associated with the SSB. The transmission indicates that a second RACH message based on multiple SFN beams has been requested for use in subsequent RACH messages, and The subsequent RACH message is received via the plurality of SFN-based beams.

21. The UE of claim 15, wherein the one or more processors, in order to receive one or more SSBs that enable or disable SFN, are configured to execute the instructions to cause the UE to receive one or more SSBs associated with RACH beamfinding and that do not enable SFN, and The one or more processors are further configured to execute the instructions to cause the UE to: A set of RACH messages associated with the one or more SSBs sent via one or more RACH timings, and Subsequent RACH messages are received via SFN-based beamforming.

22. The UE of claim 21, wherein the one or more processors are configured to execute the instructions to cause the UE to: transmit a set of RACH messages associated with the one or more SSBs via the one or more RACH timings. The set of RACH messages is transmitted at least in part based on a configured preamble transition sequence, the configured preamble transition sequence indicating that the set of RACH messages is associated with the UE, or The set of RACH messages is transmitted at least in part based on a configured frequency hopping sequence, which indicates that the set of RACH messages is associated with the UE.

23. A base station for wireless communication, comprising: At least one memory including instructions; and One or more processors, the one or more processors being configured to execute the instructions to cause the base station to: The base station sends an indication that the first set of Synchronization Signal Blocks (SSBs) supports SFN Random Access Channel (RACH) beam refinement and the second set of SSBs does not support SFN RACH beam refinement. as well as As part of RACH operation, one or more SSBs are transmitted, which are associated with RACH beamfinding and enable or disable SFN, and the one or more SSBs are included in a first set of SSBs or a second set of SSBs.

24. The base station of claim 23, wherein the one or more processors are configured to execute the instructions to cause the base station to: Send the instruction within the RACH configuration, or The instruction is sent within the System Information Block (SIB).

25. The base station of claim 23, wherein the indication is associated with the one or more synchronization signal blocks (SSBs).

26. The base station of claim 23, wherein the one or more processors are configured to execute the instructions to cause the base station to transmit an SSB associated with RACH beamfinding and to enable SFN in order to transmit the one or more SSBs that enable or disable SFN. The one or more processors are further configured to execute the instructions to cause the base station to: Receive the RACH message associated with the SSB, and Subsequent RACH messages are transmitted via SFN using multiple transmit / receive points (TRPs) at least in part, based on the SSB that enables SFN.

27. The base station of claim 23, wherein the one or more processors are configured to execute the instructions to cause the base station to transmit an SSB associated with RACH beamfinding and not to enable SFN in order to transmit the one or more SSBs that enable or disable SFN. The one or more processors are further configured to execute the instructions to cause the base station to: Receive the first RACH message associated with the SSB, and The receiver indicates that the second RACH message based on the SFN beam is requested for use in subsequent RACH messages.

28. The base station of claim 23, wherein the one or more processors are configured to execute the instructions to cause the base station to transmit an SSB associated with RACH beamfinding and not to enable SFN in order to transmit the one or more SSBs that enable or disable SFN. The one or more processors are further configured to execute the instructions to cause the base station to: Receive the first RACH message associated with the SSB. The receive indication is requested for subsequent RACH messages using multiple SFN-based beams in a second RACH message, and The subsequent RACH message is received via the plurality of SFN-based beams.

29. The base station of claim 23, wherein the one or more processors are configured to execute the instructions to cause the base station to transmit one or more SSBs associated with RACH beamfinding and not to enable SFN in order to transmit the one or more SSBs that enable or disable SFN. The one or more processors are further configured to execute the instructions to cause the base station to: A set of RACH messages associated with the one or more SSBs received via one or more RACH timings, and The set of RACH messages is determined to be associated with a single user equipment.

30. The base station of claim 29, wherein the one or more processors are configured to execute the instructions to cause the base station to: determine that the set of RACH messages is associated with a single user equipment. The set of RACH messages is associated with a single user equipment based at least in part on one or more of the following: A set of RACH messages receiving a configured preamble transition sequence, or Receive a set of RACH messages with a configured frequency hopping sequence.

31. An apparatus for performing wireless communication at a user equipment (UE), the apparatus comprising components for performing the method of any one of claims 1-7.

32. An apparatus for performing wireless communication at a base station, the apparatus comprising components for performing the method of any one of claims 8-14.

33. A computer-readable medium having program code recorded thereon, wherein the program code is executable by one or more processors to cause the processors to perform the method of any one of claims 1-14.

34. A computer program product comprising computer-readable instructions, wherein, When executed by one or more processors, the instructions cause the processors to perform the method of any one of claims 1-14.

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