Interleaved synchronization signal blocks in frequency subbands for beamformed wireless communication

Abstract

Methods, systems, and apparatus for wireless communications are described that provide staggered synchronization signal blocks (SSBs) in frequency subbands for beamformed wireless communications. Transmissions of SSBs and control channel transmissions (e.g., remaining minimum system information (RMSI) physical downlink control channel (PDCCH) transmissions) may use multiple transmit beams in a beam sweeping procedure. SSB transmissions may be transmitted using a transmit beam spanning one of several available frequency subbands, and control channel transmissions may use transmit beams spanning two or more frequency subbands. The SSB beam sweeping procedure may be performed separately during staggered, non-overlapping time periods for each of the several frequency subbands. Each of these SSBs may indicate a reference timing of a base station that is used to identify a set of resources (e.g., a control resource set (CORESET)) that carry control channel transmissions.

Description

[0001] Cross-references

[0002] This patent application claims the benefit of U.S. Provisional Patent Application No. 62 / 800,074, filed by Chendamarai Kannan et al. on February 1, 2019, entitled “Staggered Synchronization Signal Blocks in Frequency Sub-Bands for Beamformed Wireless Communications,” and U.S. Patent Application No. 16 / 777,326, filed by Chendamarai Kannan et al. on January 30, 2020, entitled “Staggered Synchronization Signal Blocks in Frequency Sub-Bands for Beamformed Wireless Communications,” each of which is assigned to the assignee of this application.

[0003] background

[0004] The following relates generally to wireless communications, and more particularly to interleaved synchronization signal blocks (SSBs) in frequency subbands for beamformed wireless communications.

[0005] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcasting, etc. These systems may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems (such as long term evolution (LTE) systems, advanced LTE (LTE-A) systems, or LTE-A Pro systems), and fifth generation (5G) systems that may be referred to as new radio (NR) systems. These systems may use various technologies, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform extended orthogonal frequency division multiplexing (DFT-s-OFDM). A wireless multiple access communication system may include several base stations or network access nodes, each of which simultaneously supports the communication of multiple communication devices, which may be referred to as user equipment (UE).

[0006] In some cases, a wireless device (e.g., a base station, a UE, etc.) may use beamformed or precoded signals to transmit and / or receive wireless communications. For example, a base station may utilize beamformed or precoded transmissions to provide directional transmissions that may alleviate path losses that may be experienced by non-beamformed or non-precoded transmissions that may have relatively wide beams or omnidirectional transmission patterns. In some cases, a UE may monitor one or more beams as part of a beam sweeping procedure to identify one or more specific beams suitable for beamformed communications between the UE and the base station. In some cases, the UE may obtain information for communicating with the base station from information provided via the beam sweeping procedure. Efficient techniques for identifying beams used for communication and associated information can help enhance the reliability and efficiency of networks that utilize beamforming.

[0007] Overview

[0008] The described techniques relate to improved methods, systems, devices, and apparatus (means) for supporting staggered synchronization signal blocks (SSBs) in frequency subbands for beamformed wireless communications. Various techniques provide SSB transmissions and control channel transmissions (e.g., remaining minimum system information (RMSI) physical downlink control channel (PDCCH) transmissions on a specific control resource set (CORESET)) via multiple transmit beams in a beam sweeping procedure. In some cases, SSB transmissions may be transmitted using a transmit beam spanning one of several available frequency subbands, and control channel transmissions may be transmitted using a transmit beam spanning two or more frequency subbands. In some cases, the SSB beam sweeping procedure is performed separately during staggered, non-overlapping time periods for each non-overlapping frequency subband in the several frequency subbands. In some cases, each of these SSBs indicates a reference timing of a base station, which is used to identify a set of resources carrying control channel transmissions.

[0009] In some cases, a base station transmitting SSB and control channel transmissions may perform a listen-before-talk (LBT) procedure prior to transmitting the SSB and control channel transmissions. In some cases, the SSB may be transmitted in a transmission without LBT. In the case where the SSB is transmitted after the LBT procedure, an SSB time window may be identified and the SSB is transmitted during the SSB time window. In some cases, a number of quantized starting positions are available within the SSB time window at which the base station may begin an SSB beam sweeping procedure. In some cases, the SSB beam sweeping procedure may transmit the SSB on a predetermined transmit beam sequence that begins upon completion of the LBT procedure. In other cases, the SSB beam sweeping procedure may transmit the SSB on a predetermined transmit beam sequence that begins at a timing boundary within the SSB time window.

[0010] A method for wireless communication at a user equipment (UE) is described. The method may include: monitoring one or more frequency subbands in a set of frequency subbands for a SSB from a base station, wherein each frequency subband in the set of frequency subbands carries non-overlapping instances of the SSB; receiving a first instance of the SSB via at least a first frequency subband in the set of frequency subbands based on the monitoring; determining a reference timing of the base station based on one or more of information from the first instance of the SSB or a frequency position of the first frequency subband relative to a reference frequency subband of the set of frequency subbands; identifying a resource set for a control channel transmission from the base station based on the reference timing, wherein the resource set spans two or more frequency subbands in the set of frequency subbands; and receiving the control channel transmission via the resource set.

[0011] A device for wireless communication at a UE is described. The device may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions are executable by the processor so that the device: monitors one or more frequency subbands in a frequency subband set to find a SSB from a base station, wherein each frequency subband in the frequency subband set carries a non-overlapping instance of the SSB; receives a first instance of the SSB via at least a first frequency subband in the frequency subband set based on the monitoring; determines a reference timing of the base station based on information from the first instance of the SSB or one or more of the frequency positions of the first frequency subband relative to a reference frequency subband of the frequency subband set; identifies a resource set for control channel transmission from the base station based on the reference timing, wherein the resource set spans two or more frequency subbands in the frequency subband set; and receives the control channel transmission via the resource set.

[0012] Another apparatus for wireless communication at a UE is described. The apparatus may include means for: monitoring one or more frequency subbands in a set of frequency subbands for a SSB from a base station, wherein each frequency subband in the set of frequency subbands carries non-overlapping instances of the SSB; receiving a first instance of the SSB via at least a first frequency subband in the set of frequency subbands based on the monitoring; determining a reference timing of the base station based on one or more of information from the first instance of the SSB or a frequency position of the first frequency subband relative to a reference frequency subband of the set of frequency subbands; identifying a set of resources for a control channel transmission from the base station based on the reference timing, wherein the set of resources spans two or more frequency subbands in the set of frequency subbands; and receiving the control channel transmission via the set of resources.

[0013] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor for the following operations: monitoring one or more frequency subbands in a set of frequency subbands to find a SSB from a base station, wherein each frequency subband in the set of frequency subbands carries non-overlapping instances of the SSB; receiving a first instance of the SSB via at least a first frequency subband in the set of frequency subbands based on the monitoring; determining a reference timing of the base station based on one or more of information from the first instance of the SSB or a frequency position of the first frequency subband relative to a reference frequency subband of the set of frequency subbands; identifying a resource set for a control channel transmission from the base station based on the reference timing, wherein the resource set spans two or more frequency subbands in the set of frequency subbands; and receiving the control channel transmission via the resource set.

[0014] In some examples of methods, devices, and non-transitory computer-readable media described herein, monitoring may include operations, features, means, or instructions for the following actions: monitoring two or more frequency subbands in the set of frequency subbands to find corresponding instances of the SSB; and combining two or more instances of the SSB from two or more frequency subbands in the monitored set of frequency subbands. Some examples of methods, devices, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for the following actions: identifying a fixed time periodicity for monitoring one or more frequency subbands in the set of frequency subbands to find SSBs from a base station. In some examples of methods, devices, and non-transitory computer-readable media described herein, each frequency subband in the set of frequency subbands carries non-overlapping instances of the SSB in time and frequency.

[0015] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for the following actions: identifying an SSB time window for monitoring one or more frequency subbands in the set of frequency subbands to find an SSB from the base station. In some examples of the methods, devices, and non-transitory computer-readable media described herein, the SSB may be transmitted using an SSB beam sweeping procedure, wherein a series of consecutive transmit beams within each frequency subband each carry a respective SSB, and wherein the same initial transmit beam in the series of consecutive transmit beams is used regardless of when the SSB beam sweeping procedure begins within the SSB time window.

[0016] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the SSB may be transmitted using an SSB beam sweeping procedure, wherein a series of consecutive transmit beams each carry a respective SSB with an SSB index indicating a position of the SSB relative to a frame boundary within each frequency subband in the set of frequency subbands. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, each instance of the SSB transmitted via each frequency subband in the set of frequency subbands indicates the same CORESET resource set used for the control channel transmission from the base station, and wherein the control channel transmission is an RMSI PDCCH transmission

[0017] In some examples of methods, devices, and non-transitory computer-readable media described herein, the SSB payload of each instance of the SSB indicates a reference timing of the base station relative to the corresponding instance of the SSB. In some examples of methods, devices, and non-transitory computer-readable media described herein, each frequency subband in the set of frequency subbands has a corresponding offset from the reference timing of the base station. Some examples of methods, devices, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for the following actions: determining a frequency offset of a resource set relative to a first frequency subband based on information provided by a first instance of the SSB.

[0018] In some examples of methods, devices, and non-transitory computer-readable media described herein, the resource set includes a predetermined start time resource for the control channel transmission relative to a reference frequency subband in the set of frequency subbands. In some examples of methods, devices, and non-transitory computer-readable media described herein, the resource set includes a control channel time window during which the UE will monitor the control channel transmission. In some examples of methods, devices, and non-transitory computer-readable media described herein, the duration of the control channel time window can be based on the LBT procedure duration and the number of LBT attempts that the base station is configured to perform before discarding the control channel transmission.

[0019] A method for wireless communication at a base station is described. The method may include: identifying a set of frequency subbands for transmitting a set of SSBs via a set of transmit beams in an SSB beam sweeping procedure; identifying a set of resources for transmitting a set of RMSI control channel transmissions via the set of transmit beams in an RMSI beam sweeping procedure, wherein the set of resources spans two or more frequency subbands in the set of frequency subbands; transmitting the set of SSBs via the set of transmit beams in each subband in the set of subbands in the SSB beam sweeping procedure, wherein the SSB beam sweeping procedure is performed separately during non-overlapping time periods for each frequency subband in the set of frequency subbands, and wherein each SSB in the set of SSBs indicates a reference timing of a base station, the reference timing being used to identify the set of resources; performing an LBT procedure to initiate a set of RMSI control channel transmissions; and in response to completing the LBT procedure, transmitting the set of RMSI control channel transmissions via the set of transmit beams in the RMSI beam sweeping procedure using the set of resources.

[0020] An apparatus for wireless communication at a base station is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. These instructions are executable by a processor to cause the device to: identify a frequency subband set for transmitting a SSB set via a transmit beam set in an SSB beam sweeping procedure; identify a resource set for transmitting a RMSI control channel transmission set via the transmit beam set in an RMSI beam sweeping procedure, wherein the resource set spans two or more frequency subbands in the frequency subband set; transmit the SSB set via the transmit beam set in each subband in the subband set in the SSB beam sweeping procedure, wherein the SSB beam sweeping procedure is performed separately during non-overlapping time periods for each frequency subband in the frequency subband set, and wherein each SSB in the SSB set indicates a reference timing of a base station, which reference timing is used to identify the resource set; execute an LBT procedure to initiate a RMSI control channel transmission set; and in response to completing the LBT procedure, use the resource set to transmit the RMSI control channel transmission set via the transmit beam set in the RMSI beam sweeping procedure.

[0021] Another apparatus for wireless communication at a base station is described. The apparatus may include means for: identifying a set of frequency subbands for transmitting a set of SSBs via a set of transmit beams in an SSB beam sweeping procedure; identifying a set of resources for transmitting a set of RMSI control channel transmissions via the set of transmit beams in an RMSI beam sweeping procedure, wherein the set of resources spans two or more frequency subbands in the set of frequency subbands; transmitting the set of SSBs via the set of transmit beams in each subband in the set of subbands in the SSB beam sweeping procedure, wherein the SSB beam sweeping procedure is performed separately during non-overlapping time periods for each frequency subband in the set of frequency subbands, and wherein each SSB in the set of SSBs indicates a reference timing of a base station, the reference timing being used to identify the set of resources; performing an LBT procedure to initiate a set of RMSI control channel transmissions; and in response to completing the LBT procedure, transmitting the set of RMSI control channel transmissions via the set of transmit beams in the RMSI beam sweeping procedure using the set of resources.

[0022] A non-transitory computer-readable medium storing code for wireless communication at a base station is described. The code may include instructions executable by a processor for the following operations: identifying a set of frequency subbands for transmitting a set of SSBs via a set of transmit beams in an SSB beam sweeping procedure; identifying a set of resources for transmitting a set of RMSI control channel transmissions via the set of transmit beams in an RMSI beam sweeping procedure, wherein the set of resources spans two or more frequency subbands in the set of frequency subbands; transmitting the set of SSBs via the set of transmit beams in each subband in the set of subbands in the SSB beam sweeping procedure, wherein the SSB beam sweeping procedure is performed separately during non-overlapping time periods for each frequency subband in the set of frequency subbands, and wherein each SSB in the set of SSBs indicates a reference timing of a base station, the reference timing being used to identify the set of resources; performing an LBT procedure to initiate a set of RMSI control channel transmissions; and in response to completing the LBT procedure, transmitting the set of RMSI control channel transmissions via the set of transmit beams in the RMSI beam sweeping procedure using the set of resources.

[0023] In some examples of methods, devices, and non-transitory computer-readable media described herein, each of the SSBs may be transmitted according to a fixed time periodicity without performing an LBT procedure. Some examples of methods, devices, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying an SSB time window for each frequency subband in a set of frequency subbands for transmitting a set of SSBs, and performing an LBT procedure during the SSB time window for each frequency subband in the set of frequency subbands before transmitting the set of SSBs, wherein the set of SSBs is transmitted in response to successfully completing the LBT procedure.

[0024] In some examples of the methods, devices, and non-transient computer-readable media described herein, the same initial transmit beam of the SSB beam sweeping procedure may be used regardless of when the SSB beam sweeping procedure starts within the SSB time window. In some examples of the methods, devices, and non-transient computer-readable media described herein, each SSB in the set of SSBs may have an associated SSB index indicating the position of the SSB within a predetermined SSB pattern relative to a frame boundary within each frequency subband in the set of frequency subbands. In some examples of the methods, devices, and non-transient computer-readable media described herein, each SSB in the SSBs transmitted via each frequency subband in the set of frequency subbands indicates the same set of resources for RMSI control channel transmission. In some examples of the methods, devices, and non-transient computer-readable media described herein, the SSB payload of each SSB of the SSBs indicates a reference timing of the base station relative to the corresponding SSB. In some examples of the methods, devices, and non-transient computer-readable media described herein, each frequency subband in the set of frequency subbands has a corresponding time offset from the reference timing of the base station. In some examples of the methods, devices, and non-transitory computer-readable media described herein, each SSB in the set of SSBs provides an indication of a frequency offset of the set of resources relative to a corresponding frequency subband of the set of frequency subbands used to transmit the SSB.

[0025] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the resource set includes a predetermined start time resource for RMSI control channel transmission relative to a reference subband in the frequency subband set. In some examples of the methods, devices, and non-transitory computer-readable media described herein, the resource set may be associated with an RMSI time window during which an RMSI beam sweeping procedure is to be performed, and wherein the start time of the RMSI beam sweeping procedure within the RMSI time window depends on the completion time of the LBT procedure for initiating the RMSI control channel transmission set. In some examples of the methods, devices, and non-transitory computer-readable media described herein, the duration of the RMSI time window is based on the duration of the LBT procedure and the number of LBT attempts that the base station is configured to perform before discarding the RMSI control channel transmission set. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1

[0013] An example of a wireless communication system supporting staggered synchronization signal blocks (SSBs) in frequency subbands for beamformed wireless communication in accordance with aspects of the present disclosure is illustrated.

[0028] Figure 2 An example of a portion of a wireless communication system supporting staggered SSB in frequency subbands for beamformed wireless communications in accordance with aspects of the present disclosure is illustrated.

[0029] Figure 3

[0013] Examples of SSB and RMSI resource configurations that support staggered SSBs in frequency subbands for beamformed wireless communications in accordance with aspects of the present disclosure are illustrated.

[0030] Figure 4

[0026] Another example of SSB and RMSI resource configuration supporting staggered SSBs in frequency subbands for beamformed wireless communications in accordance with aspects of the present disclosure is illustrated.

[0031] Figure 5

[0013] An example of a floating resource configuration supporting staggered SSBs in frequency subbands for beamformed wireless communications in accordance with aspects of the present disclosure is illustrated.

[0032] Figure 6

[0013] An example of a process flow to support staggered SSB in frequency subbands for beamformed wireless communications in accordance with aspects of the present disclosure is illustrated.

[0033] Figure 7 and 8 A block diagram of a device supporting staggered SSB in frequency sub-bands for beamformed wireless communications is shown in accordance with aspects of the present disclosure.

[0034] Fig. 9 A block diagram of a communication manager supporting staggered SSB in frequency sub-bands for beamformed wireless communications is shown in accordance with aspects of the present disclosure.

[0035] Fig.10

[0013] A diagram of a system including a device supporting staggered SSB in frequency sub-bands for beamformed wireless communications in accordance with aspects of the present disclosure is shown.

[0036] Fig.11 and 12 A block diagram of a device supporting staggered SSB in frequency sub-bands for beamformed wireless communications is shown in accordance with aspects of the present disclosure.

[0037] Fig.13 A block diagram of a communication manager supporting staggered SSB in frequency sub-bands for beamformed wireless communications is shown in accordance with aspects of the present disclosure.

[0038] Fig.14

[0013] A diagram of a system including a device supporting staggered SSB in frequency sub-bands for beamformed wireless communications in accordance with aspects of the present disclosure is shown.

[0039] Figures 15 to 19 A flow chart illustrating a method of supporting staggered SSB in frequency sub-bands for beamformed wireless communications in accordance with aspects of the present disclosure is shown.

[0040] Detailed Description

[0041] Various aspects of the present disclosure relate to methods, systems, devices, and apparatuses for supporting initial access in beamforming communications between user equipment (UE) and a base station. In some cases, a base station may use beamforming communications in one or more beam sweeping procedures to transmit information for initiating an initial access procedure. In some cases, a first beam sweeping procedure may provide a discovery reference signal (DRS) (e.g., a synchronization signal block (SSB) having a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH) with initial system information) via a set of beams transmitted using frequency subbands in several available frequency subbands. In some cases, a transmit beam spanning one of several available frequency subbands may be used to transmit an SSB transmission. In some cases, the first beam sweeping procedure may be performed separately during staggered, non-overlapping time periods for each of the several frequency subbands. In some cases, each of the several SSBs transmitted in each subband in a beam sweeping procedure indicates a reference timing of the base station, which is used to identify a set of resources (e.g., a control resource set (CORESET)) that carries a control channel transmission (e.g., a remaining minimum system information (RMSI) physical downlink control channel (PDCCH) transmission). In some cases, the control channel transmission may provide the location of resources for a shared channel transmission of system information (e.g., a RMSI physical downlink shared channel (PDSCH) transmission that provides system information parameters).

[0042] The second beam sweeping procedure may provide control channel transmissions (e.g., RMSI PDCCH transmissions in a CORESET indicated by an SSB) via a beam set that is used in the first beam sweeping procedure and that may be transmitted using multiple frequency subbands. In some cases, a listen-before-talk (LBT) procedure may be performed prior to one or both of these beam sweeping procedures, and transmissions may be initiated only when the LBT procedure indicates that the one or more frequency bands are not occupied by other transmitters. In the case where the LBT procedure is used prior to the first beam sweeping procedure, the transmit beam sequence may be established relative to when the LBT procedure is completed or relative to a timing boundary. The UE may monitor transmissions of the first beam sweeping procedure and determine CORESET resources based on the DRS to monitor control channel transmissions (e.g., RMSI PDCCH transmissions). In some cases, the RMSI PDCCH transmission may provide the location of resources for RMSI PDSCH transmissions that provide system information parameters. The UE may initiate system access based on the DRS and the received system information.

[0043] In some cases, the UE may monitor multiple frequency subbands in the first beam sweeping procedure to try and detect DRS. In other cases, the UE may monitor only one frequency subband, or a subset of multiple frequency subbands used in the first beam sweeping procedure. In some cases, the UE may monitor multiple frequency subbands and combine multiple instances of SSB received via two or more of the monitored frequency subbands. In the case where the first beam sweeping procedure does not use the LBT procedure, the base station may transmit beams according to the beam sequence of the first beam sweeping procedure, and the location of the resources of the second beam sweeping procedure may be determined based on the transmission time of each frequency subband in the first beam sweeping procedure. In the case where the first beam sweeping procedure uses the LBT procedure, an SSB time window may be identified, and the beam of the first beam sweeping procedure may be transmitted in each subband during the associated SSB time window of each frequency subband. In some cases, there are several quantized starting positions available within each SSB time window where the base station can start the first beam sweeping procedure. In some cases, the first beam sweep procedure may transmit SSBs on a predetermined transmit beam sequence that begins upon completion of the LBT procedure. In other cases, the first beam sweep procedure may transmit SSBs on a predetermined transmit beam sequence that begins at a timing boundary within an associated SSB time window.

[0044] In some cases, the second beam sweeping procedure may begin at a fixed transmission time after the first beam sweeping procedure. In such cases, if the LBT procedure fails before the second beam sweeping procedure, the second beam sweeping procedure may be discarded and restarted according to the periodicity associated with the second beam sweeping procedure. In some cases, a second time window associated with the second beam sweeping procedure may be identified and transmissions may be started within the second time window based on when the LBT procedure succeeds. In some cases, the control channel transmissions in the second beam sweeping procedure may span multiple frequency subbands. In some cases, the frequency subbands of the second beam sweeping procedure may be indicated by the base station in the first beam sweeping procedure (e.g., based on synchronization sequence partitioning of the synchronization signal transmitted in the first beam sweeping procedure, explicit indication of frequency offset, etc.).

[0045] Thus, the techniques discussed herein may provide efficient detection of system information used in an initial access procedure (e.g., in a random access channel (RACH) access procedure based on system information obtained in SSB and RMSI transmissions). In some cases, SSB transmissions in a first beam sweeping procedure using a single frequency subband may allow for an increase in the power spectral density (PSD) of the SSB transmissions, which may enhance the likelihood of detection at the UE. Control channel transmissions (e.g., RMSI PDCCH transmissions) in a second beam sweeping procedure may span additional frequency subbands and thus carry additional information related to the SSB transmissions. The UE may identify the beamforming characteristics of the second beam sweeping procedure based on the SSB, and thus the transmit beam of the second beam sweeping procedure may have a reduced PSD relative to the first beam sweeping procedure, but still provide sufficient detection reliability at the UE. Such techniques may therefore enhance the efficiency and reliability of wireless communication systems through more efficient beamformed communications.

[0046] Various aspects of the present disclosure are initially described in the context of a wireless communication system. Several example resource configurations for SSB and RSMI beam sweeping procedures are then discussed. Various aspects of the present disclosure are further illustrated and described by and with reference to apparatus diagrams, system diagrams, and flow diagrams related to staggered SSB in frequency subbands for beamformed wireless communication.

[0047] Figure 1 An example of a wireless communication system 100 that supports staggered SSB in frequency subbands for beamformed wireless communication in accordance with various aspects of the present disclosure is illustrated. The wireless communication system 100 includes a base station 105, a UE 115, and a core network 130. In some examples, the wireless communication system 100 may be a long term evolution (LTE) network, an advanced LTE (LTE-A) network, an LTE-A Pro network, or a new radio (NR) network. In some cases, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low latency communications, or communications with low-cost and low-complexity devices.

[0048] The base station 105 may communicate wirelessly with the UE 115 via one or more base station antennas. The base station 105 described herein may include or may be referred to by those skilled in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a Node B, an evolved Node B (eNB), a next generation Node B, or a Gigabit Node B (any of which may be referred to as a gNB), a Home Node B, a Home Evolved Node B, or some other suitable terminology. The wireless communication system 100 may include different types of base stations 105 (e.g., macro cell base stations or small cell base stations). The UE 115 described herein may be able to communicate with various types of base stations 105 and network equipment (including macro eNBs, small cell eNBs, gNBs, relay base stations, etc.).

[0049] Each base station 105 may be associated with a particular geographic coverage area 110 in which it supports communications with various UEs 115. Each base station 105 may provide communications coverage for the respective geographic coverage area 110 via a communications link 125, and the communications link 125 between the base station 105 and the UE 115 may utilize one or more carriers. The communications link 125 shown in the wireless communication system 100 may include an uplink transmission from the UE 115 to the base station 105, or a downlink transmission from the base station 105 to the UE 115. Downlink transmissions may also be referred to as forward link transmissions, and uplink transmissions may also be referred to as reverse link transmissions.

[0050] The geographic coverage area 110 of the base station 105 may be divided into sectors that constitute a portion of the geographic coverage area 110, and each sector may be associated with a cellular cell. For example, each base station 105 may provide communication coverage for a macrocellular cell, a small cellular cell, a hotspot, or other types of cellular cells, or various combinations thereof. In some examples, the base station 105 may be mobile and therefore provide communication coverage for a mobile geographic coverage area 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, and the overlapping geographic coverage areas 110 associated with different technologies may be supported by the same base station 105 or different base stations 105. The wireless communication system 100 may include, for example, a heterogeneous LTE / LTE-A / LTE-A Pro or NR network, in which different types of base stations 105 provide coverage for various geographic coverage areas 110.

[0051] The term "cell" refers to a logical communication entity for communicating with base station 105 (e.g., on a carrier), and may be associated with an identifier to distinguish adjacent cells operating via the same or different carriers (e.g., physical cell identifier (PCID), virtual cell identifier (VCID)). In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types that may provide access to different types of devices (e.g., machine type communication (MTC), narrowband Internet of Things (NB-IoT), enhanced mobile broadband (eMBB), or others). In some cases, the term "cell" may refer to a portion of a geographic coverage area 110 (e.g., a sector) on which the logical entity operates.

[0052] Each UE 115 can be dispersed throughout the wireless communication system 100, and each UE 115 can be stationary or mobile. UE 115 can also be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable term, wherein "device" can also be referred to as a unit, a station, a terminal, or a client. UE 115 can also be a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 can also refer to a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or an MTC device, etc., which can be implemented in various items (such as electrical appliances, vehicles, meters, etc.).

[0053] Some UEs 115, such as MTC or IoT devices, may be low-cost or low-complexity devices and may provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication technology that allows devices to communicate with each other or with a base station 105 without human intervention. In some examples, M2M communication or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay the information to a central server or application, which may utilize the information or present the information to a person interacting with the program or application. Some UEs 115 may be designed to collect information or implement automated behavior of machines. Examples of applications for MTC devices include: smart metering, inventory monitoring, water level monitoring, equipment monitoring, health care monitoring, field survival monitoring, weather and geographic event monitoring, queue management and tracking, remote security sensing, physical access control, and transaction-based commercial charging.

[0054] Some UEs 115 may be configured to employ a reduced power consumption mode of operation, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception but not simultaneous transmission and reception). In some examples, half-duplex communication may be performed with a reduced peak rate. Other power saving techniques for UE 115 include entering a power saving "deep sleep" mode when not engaged in active communications, or operating over a limited bandwidth (e.g., in accordance with narrowband communications). In some cases, UE 115 may be designed to support critical functions (e.g., mission critical functions), and the wireless communication system 100 may be configured to provide ultra-reliable communications for these functions.

[0055] In some cases, UE 115 may also be able to communicate directly with other UE 115 (e.g., using a peer-to-peer (P2P) or device-to-device (D2D) protocol). One or more UEs in a group of UEs 115 utilizing D2D communication may be within the geographic coverage area 110 of the base station 105. Other UEs 115 in this group may be outside the geographic coverage area 110 of the base station 105, or may not be able to receive transmissions from the base station 105 for other reasons. In some cases, each group of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system, in which each UE 115 transmits to each other UE 115 in the group. In some cases, the base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between UEs 115 without involving the base station 105.

[0056] The base stations 105 may communicate with the core network 130 and with each other. For example, the base stations 105 may interface with the core network 130 via a backhaul link 132 (e.g., via S1, N2, N3, or other interfaces). The base stations 105 may communicate with each other directly (e.g., directly between the base stations 105) or indirectly (e.g., via the core network 130) on a backhaul link 134 (e.g., via X2, Xn, or other interfaces).

[0057] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC), which may include at least one mobility management entity (MME), at least one serving gateway (S-GW), and at least one packet data network (PDN) gateway (P-GW). The MME may manage non-access layer (e.g., control plane) functions such as mobility, authentication, and bearer management of UEs 115 served by base stations 105 associated with the EPC. User IP packets may be delivered through the S-GW, which itself may be connected to the P-GW. The P-GW may provide IP address allocation and other functions. The P-GW may be connected to network operator IP services. Operator IP services may include access to the Internet, an intranet, an IP multimedia subsystem (IMS), or packet switched (PS) streaming services.

[0058] At least some network devices (such as base stations 105) may include subcomponents, such as access network entities, which may be examples of access node controllers (ANCs). Each access network entity may communicate with each UE 115 through a number of other access network transport entities, which may be referred to as radio heads, smart radio heads, or transmission / reception points (TRPs). In some configurations, the various functions of each access network entity or base station 105 may be distributed across various network devices (e.g., radio heads and access network controllers) or merged into a single network device (e.g., base station 105).

[0059] The wireless communication system 100 can operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). In general, the 300 MHz to 3 GHz region is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelengths are in the range of from about 1 decimeter to 1 meter long. UHF waves can be blocked or redirected by buildings and environmental features. However, these waves can penetrate various structures sufficiently for macro cells to provide services to UEs 115 located indoors. Transmission of UHF waves can be associated with smaller antennas and shorter ranges (e.g., less than 100 km) compared to transmission using lower frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.

[0060] The wireless communication system 100 may also operate in the Super High Frequency (SHF) region using frequency bands from 3 GHz to 30 GHz, also known as centimeter bands. The SHF region includes frequency bands that may be opportunistically used by devices that may be able to tolerate interference from other users, such as the 5 GHz Industrial, Scientific, and Medical (ISM) band.

[0061] The wireless communication system 100 may also operate in the extremely high frequency (EHF) division of the spectrum (e.g., from 30 GHz to 300 GHz), which is also referred to as the millimeter band. In some examples, the wireless communication system 100 may support millimeter wave (mmW) communications between the UE 115 and the base station 105, and the EHF antenna of the corresponding device may be even smaller and more closely spaced than the UHF antenna. In some cases, this may facilitate the use of antenna arrays within the UE 115. However, the propagation of EHF transmissions may be subject to even greater atmospheric attenuation and shorter range than SHF or UHF transmissions. The technology disclosed herein may be adopted across transmissions using one or more different frequency divisions, and the use of frequency bands specified across these frequency divisions may differ by country or regulatory agency.

[0062] In some cases, the wireless communication system 100 may utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 may employ license assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band (such as a 5 GHz ISM band). When operating in an unlicensed radio frequency spectrum band, wireless devices (such as base stations 105 and UE 115) may employ LBT procedures to ensure that the frequency channel is clear before transmitting data. In some cases, operations in unlicensed bands may be based on carrier aggregation configurations (e.g., LAA) coordinated with component carriers operating in licensed bands. Operations in unlicensed spectrum may include downlink transmissions, uplink transmissions, peer-to-peer transmissions, or a combination of these. Duplexing in unlicensed spectrum may be based on frequency division duplexing (FDD), time division duplexing (TDD), or a combination of the two.

[0063] In some examples, the base station 105 or the UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. For example, the wireless communication system 100 may use a transmission scheme between a transmitting device (e.g., the base station 105) and a receiving device (e.g., the UE 115), wherein the transmitting device is equipped with multiple antennas and the receiving device is equipped with one or more antennas. MIMO communication may employ multipath signal propagation to increase spectral efficiency by transmitting or receiving multiple signals via different spatial layers, which may be referred to as spatial multiplexing. For example, the transmitting device may transmit multiple signals via different antennas or different antenna combinations. Similarly, the receiving device may receive multiple signals via different antennas or different antenna combinations. Each of these multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams. Different spatial layers may be associated with different antenna ports for channel measurement and reporting. MIMO technology includes single-user MIMO (SU-MIMO), in which multiple spatial layers are transmitted to the same receiving device, and multi-user MIMO (MU-MIMO), in which multiple spatial layers are transmitted to multiple devices.

[0064] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105 or a UE 115) to shape or direct an antenna beam (e.g., a transmit beam or a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals communicated via antenna elements of an antenna array so that signals propagating at a particular orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals communicated via antenna elements may include the transmitting device or the receiving device applying a specific amplitude and phase shift to the signal carried via each antenna element associated with the device. The adjustments associated with each antenna element may be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other orientation).

[0065] In one example, the base station 105 may use multiple antennas or antenna arrays to perform beamforming operations for directional communication with the UE 115. For example, some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted multiple times by the base station 105 in different directions, which may include a signal being transmitted according to different beamforming weight sets associated with different transmission directions. The transmissions in different beam directions may be used (e.g., by the base station 105 or a receiving device, such as the UE 115) to identify the beam direction used by the base station 105 for subsequent transmission and / or reception.

[0066] Some signals, such as data signals associated with a particular recipient device, may be transmitted by base station 105 in a single beam direction (e.g., a direction associated with a recipient device, such as UE 115). In some examples, a beam direction associated with transmissions along a single beam direction may be determined based on signals transmitted in different beam directions. For example, UE 115 may receive one or more signals transmitted by base station 105 in different directions, and UE 115 may report to base station 105 an indication of the signals received by it with the highest signal quality or other acceptable signal quality. Although these techniques are described with reference to signals transmitted by base station 105 in one or more directions, UE 115 may use similar techniques for transmitting signals multiple times in different directions (e.g., for identifying a beam direction used by UE 115 for subsequent transmission or reception) or for transmitting signals in a single direction (e.g., for transmitting data to a recipient device).

[0067] A receiving device (e.g., UE 115, which may be an example of a mmW receiving device) may try multiple receive beams when receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from base station 105. For example, the receiving device may try multiple receive directions by receiving via different antenna subarrays, processing received signals according to different antenna subarrays, receiving according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, or processing received signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as "listening" according to different receive beams or receive directions. In some examples, the receiving device may use a single receive beam to receive along a single beam direction (e.g., when receiving a data signal). The single receive beam may be aligned on a beam direction determined based on listening according to different receive beam directions (e.g., a beam direction determined to have the highest signal strength, the highest signal-to-noise ratio, or other acceptable signal quality based on listening according to multiple beam directions).

[0068] In some cases, the antennas of a base station 105 or a UE 115 may be located within one or more antenna arrays that may support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some cases, the antennas or antenna arrays associated with a base station 105 may be located at different geographic locations. A base station 105 may have an antenna array having several rows and columns of antenna ports that the base station 105 may use to support beamforming for communications with a UE 115. Likewise, a UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations.

[0069] In some cases, the wireless communication system 100 can be a packet-based network that operates according to a layered protocol stack. In the user plane, the communication of the bearer or packet data convergence protocol (PDCP) layer can be IP-based. The radio link control (RLC) layer can perform packet segmentation and reassembly to communicate on the logical channel. The media access control (MAC) layer can perform priority handling and multiplex logical channels into transport channels. The MAC layer can also use hybrid automatic repeat request (HARQ) to provide retransmission of the MAC layer, thereby improving link efficiency. In the control plane, the radio resource control (RRC) protocol layer can provide the establishment, configuration and maintenance of the RRC connection of the radio bearer supporting user plane data between the UE 115 and the base station 105 or the core network 130. In the physical layer, the transport channel can be mapped to the physical channel.

[0070] In some cases, UE 115 and base station 105 may support retransmission of data to increase the likelihood that the data is successfully received. HARQ feedback is a technique that increases the likelihood of correctly receiving data on communication link 125. HARQ may include a combination of error detection (e.g., using cyclic redundancy check (CRC)), forward error correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). HARQ can improve the throughput of the MAC layer in poor radio conditions (e.g., signal-to-noise ratio conditions). In some cases, a wireless device may support simultaneous slot HARQ feedback, where the device may provide HARQ feedback in a specific time slot for data received in a previous symbol in the time slot. In other cases, the device may provide HARQ feedback in a subsequent time slot or according to some other time interval.

[0071] The time interval in LTE or NR can be represented by a basic time unit (which may refer to a sampling period T, for example). s =1 / 30,720,000 seconds). The time intervals of the communication resources may be organized according to each other radio frame having a duration of 10 milliseconds (ms), where the frame period may be expressed as T f =307,200T s. A radio frame may be identified by a system frame number (SFN) ranging from 0 to 1023. Each frame may include 10 subframes numbered from 0 to 9, and each subframe may have a duration of 1 ms. A subframe may be further divided into 2 slots, each slot having a duration of 0.5 ms, and each slot may contain 6 or 7 modulation symbol periods (e.g., depending on the length of a cyclic prefix prepended to each symbol period). Excluding the cyclic prefix, each symbol period may contain 2048 sampling periods. In some cases, a subframe may be the minimum scheduling unit of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In other cases, the minimum scheduling unit of the wireless communication system 100 may be shorter than a subframe or may be dynamically selected (e.g., in a burst of a shortened TTI (sTTI) or in a selected component carrier using sTTI).

[0072] In some wireless communication systems, a time slot may be further divided into a plurality of mini-slots containing one or more symbols. In some instances, a symbol of a mini-slot or a mini-slot may be the minimum scheduling unit. For example, each symbol may vary in duration depending on the subcarrier spacing or the operating frequency band. Further, some wireless communication systems may implement time slot aggregation, wherein a plurality of time slots or mini-slots are aggregated together and used for communication between UE 115 and base station 105.

[0073] The term "carrier" refers to a set of radio frequency spectrum resources having a defined physical layer structure for supporting communications on the communication link 125. For example, a carrier of the communication link 125 may include a portion of a radio frequency spectrum band that operates according to a physical layer channel for a given radio access technology. Each physical layer channel may carry user data, control information, or other signaling. A carrier may be associated with a predefined frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and may be located according to a channel grid for discovery by a UE 115. A carrier may be downlink or uplink (e.g., in FDD mode), or configured to carry downlink communications and uplink communications (e.g., in TDD mode). In some examples, a signal waveform transmitted on a carrier may include multiple subcarriers (e.g., using a multi-carrier modulation (MCM) technique such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-s-OFDM)).

[0074] For different radio access technologies (e.g., LTE, LTE-A, LTE-A Pro, NR), the organizational structure of the carrier can be different. For example, the communication on the carrier can be organized according to TTIs or time slots, each of which can include user data and control information or signaling to support decoding of the user data. The carrier can also include dedicated acquisition signaling (e.g., synchronization signals or system information, etc.) and control signaling to coordinate the operation of the carrier. In some examples (e.g., in a carrier aggregation configuration), the carrier may also have acquisition signaling or control signaling to coordinate the operation of other carriers.

[0075] Physical channels may be multiplexed on a carrier according to various techniques. Physical control channels and physical data channels may be multiplexed on a downlink carrier, for example, using a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique. In some examples, control information transmitted in a physical control channel may be distributed in a cascaded manner between different control regions (e.g., between a common control region or a common search space and one or more UE-specific control regions or UE-specific search spaces).

[0076] A carrier may be associated with a particular bandwidth of the radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as the "system bandwidth" of the carrier or wireless communication system 100. For example, the carrier bandwidth may be one of several predetermined bandwidths of a carrier for a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz). In some examples, each served UE 115 may be configured to operate on part or all of the carrier bandwidth. In other examples, some UEs 115 may be configured to operate using a narrowband protocol type associated with a predefined portion or range (e.g., a set of subcarriers or RBs) within a carrier (e.g., an "in-band" deployment of a narrowband protocol type).

[0077] In a system using MCM technology, a resource element may include a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period and the subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme). Thus, the more resource elements received by UE 115 and the higher the order of the modulation scheme, the higher the data rate of UE 115 can be. In a MIMO system, wireless communication resources may refer to a combination of radio frequency spectrum resources, time resources, and space resources (e.g., space layers), and the use of multiple space layers may further increase the data rate of communication with UE 115.

[0078] A device (e.g., base station 105 or UE 115) of wireless communication system 100 may have a hardware configuration that supports communication on a particular carrier bandwidth, or may be configurable to support communication on one of a set of carrier bandwidths. In some examples, wireless communication system 100 may include base stations 105 and / or UEs 115 that support simultaneous communication via carriers associated with more than one different carrier bandwidths.

[0079] The wireless communication system 100 may support communication with the UE 115 on multiple cells or carriers, a feature that may be referred to as carrier aggregation or multi-carrier operation. The UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both FDD and TDD component carriers.

[0080] In some cases, one or more of the base stations 105 may use beamforming to communicate with one or more UEs 115. In some cases, the base station 105 using beamforming may transmit SSB and RMSI via multiple transmit beams in a beam sweeping procedure. In some cases, SSB transmissions may be transmitted in an SSB beam sweeping procedure, wherein the beam sweeping is performed separately during an interlaced, non-overlapping time period for each of the several frequency subbands. In some cases, each of these SSBs indicates a reference timing of the base station, which is used to identify a resource set (e.g., CORESET) for RMSI PDCCH transmission. In some cases, the base station 105 transmitting SSB and RMSI PDCCH transmissions may perform an LBT procedure before transmitting the SSB and RMSI PDCCH transmissions. In other cases, SSBs may be transmitted in a non-LBT transmission.

[0081] Figure 2 An example of a wireless communication system 200 that supports staggered SSB in frequency subbands for beamformed wireless communication according to aspects of the present disclosure is illustrated. In some examples, the wireless communication system 200 can implement aspects of the wireless communication system 100. The wireless communication system 200 may include a base station 105-a and a UE 115-a, which may be as described with reference to Figure 1 Examples of base stations 105 and UEs 115 are described.

[0082] The base station 105-a may provide network coverage for a geographic coverage area 110-a. The base station 105-a and the UE 115-a may communicate using beamformed or directional transmissions that carry uplink and downlink communications between the UE 115-a and the base station 105-a. When performing initial access, the UE 115-a may monitor (e.g., via a downlink or receive beam 210) system information from the base station 105-a, which may be transmitted via multiple transmit beams 205 in a beam sweeping procedure. In some cases, the UE 115-a may monitor transmissions from the base station 105-a and identify one or more beams 205 having channel characteristics that will support a connection (e.g., based on a reference signal received power (RSRP) or signal-to-noise ratio (SNR) associated with one or more detected transmit beams 205). In some cases, the UE 115-a and the base station 105-a may configure receiving hardware for transmitting / receiving beamformed transmissions using corresponding beamforming parameters associated with a particular transmit beam, where a beam pair link may have a coupled transmit beam with corresponding beamforming parameters. The beamforming parameters may include specific spatial domain filters for uplink or downlink communications associated with a particular transmit beam. In the case of coupled transmit beams, the beamforming parameters for the uplink beam may be determined based on one or more reference signals received on a selected downlink beam 205 that is quasi-co-located (QCL) with the uplink beam. If the properties of the channel on which the codewords on one antenna port are communicated can be inferred from the channel on which the codewords on the other antenna port are communicated, the two antenna ports are considered to be QCL. In some cases, QCL may be applied to spatial reception parameters, which may be referred to as QCL-TypeD.

[0083] In some cases, base station 105-a may perform multiple beam sweeping procedures that provide system information that may be used by UE 115-a in an initial access procedure. In some cases, base station 105-5a may use transmit beam 205 to transmit SSB in a first beam sweeping procedure and may use transmit beam 205 to transmit RMSI PDCCH transmission in a second beam sweeping procedure. In some cases, SSB transmissions may be transmitted in a beam sweeping procedure using a transmit beam spanning a first frequency subband of several available frequency subbands, followed by one or more additional transmissions in the beam sweeping procedure spanning one or more additional frequency subbands of the available frequency subbands. RMSI PDCCH transmissions may use a transmit beam spanning two or more frequency subbands.

[0084] Such transmissions using different frequency sub-bands may allow the base station 105-a to transmit SSBs with relatively high PSD, which may enhance the detectability of these SSBs at the UE 115a. In some cases, the transmit beam 205 may use a relatively high frequency band, such as a high-band mmW frequency in the 60-100 GHz frequency range (e.g., the "60 GHz band," which refers to the 57-64 and 64-71 GHz bands). Such frequency bands may be unlicensed, and thus different transmitters may share the frequencies according to established procedures that provide fair access to the spectrum, such as the LBT procedures. In addition, such shared frequencies may also be characterized by relatively low transmit power limits (e.g., 13 dBm / MHz with channelization of 2 GHz, with a maximum effective isotropic radiated power (EIRP) of 40 dBm; or an average EIRP of 40 dBm and a peak EIRP of 43 dBm). In some cases, such as in the 60 GHz band, there may be up to seven channels of 2 GHz each (i.e., in the 57-71 GHz range). However, with a transmit power of 13 dBm / MHz, a total power of 46 dBm on 2 GHz, or 54.5 dBm on 14 GHz (seven 2 GHz carriers) would exceed regulatory limits. Techniques such as those discussed herein may provide enhanced PSD for initial transmissions while complying with such regulatory requirements. Furthermore, in some cases, LBT may be necessary for such transmissions due to regulatory requirements, and techniques such as those discussed herein may provide efficient detection of beamformed transmissions based on when LBT is clear.

[0085] In some cases, beamforming may be used in such relatively high frequencies, which may provide a focused beam with a relatively narrow coverage area that may enhance the distance from the base station 105a at which a signal may be received and also reduce the likelihood of LBT failures due to the relatively narrow beam. In addition, techniques such as discussed herein may provide enhanced and reliable signal detection for initial system access. In some cases, the base station 105-a may transmit SSB transmissions using non-overlapping staggered beam sweeping transmissions in multiple frequency subbands, followed by a separate beam sweeping procedure, wherein the base station 105-a may transmit RMSI-PDCCH transmissions using resources that may be determined by the UE 115-a based on detected SSB transmissions, wherein the RMSI bandwidth may not match the SSB bandwidth and the timing of the RMSI PDCCH transmissions may float within the transmission window. Additionally or alternatively, the base station 105-a may transmit SSB transmissions in a floating SSB time window on each frequency subband. Examples of such techniques will be referenced in Figures 3 to 6 Have a discussion.

[0086] Figure 3An example of an SSB and RMSI resource configuration 300 that supports staggered SSBs in frequency subbands for beamformed wireless communications in accordance with aspects of the present disclosure is illustrated. In some examples, the SSB and RMSI resource configuration 300 can implement aspects of the wireless communication system 100 or 200. In this example, a base station and a UE (which may be Figure 1 2) may perform beamformed transmissions in frequency band 305. In some cases, frequency band 305 may be a high-band mmW band.

[0087] In this example, several frequency sub-bands may be configured, including a first sub-band 310-a (F1), a second sub-band 310-b (F2), a third sub-band 310-c (F3), and a fourth sub-band 310-d (F4). Figure 3 2. Four frequency subbands 310 are illustrated in FIG. 2, but other numbers of frequency subbands may be used, and the example of four frequency subbands is provided for purposes of illustration and discussion only. In this example, the base station may transmit a first instance 315-a of a beamformed SSB via an SSB beam sweeping procedure using a first frequency subband 310-a, transmit a second instance 315-b of a beamformed SSB via an SSB beam sweeping procedure using a second frequency subband 310-b, transmit a third instance 315-c of a beamformed SSB via an SSB beam sweeping procedure using a third frequency subband 310-c, and transmit a fourth instance 315-d of a beamformed SSB via an SSB beam sweeping procedure using a fourth frequency subband 310-d.

[0088] In this example, each of the beamformed SSBs 315 may provide an indication of the same set of resources (e.g., CORESET) for the RMSI beam sweeping procedure used to transmit the beamformed RMSI control channel transmission 320 (e.g., an RMSI PDSCH transmission, which may indicate the resources of the RMSI PDSCH transmission used to provide system information). In this example, the RMSI beam sweeping procedure of the beamformed RMSI control channel transmission 320 may be transmitted during the RMSI window 325 via the same set of transmit beams as used for the SSB beam sweeping procedure, but may be transmitted using frequencies spanning the first frequency subband 310-a to the third frequency subband 310-c. In this example, the SSBs 315 and the RMSI control channel transmission 320 may be transmitted according to a predetermined periodicity to provide detection by one or more UEs that may be seeking to obtain network access. In such a case, additional instances of the beamformed SSBs 315 may be transmitted, followed by additional instances of the beamformed RMSI control channel transmission 320, which may span different frequency subbands than the SSB transmissions. Although the beamformed RMSI control channel transmission 320 is illustrated as spanning three frequency sub-bands 310, in other cases such transmissions may span more or fewer frequency sub-bands.

[0089] In this example, the staggered SSB 315 may thus cycle between each of the plurality of predefined frequency subbands 310. In this manner, when one SSB 315 is transmitted at a time in one associated frequency subband 310, the PSD of the SSB 315 transmission may be maximized for each frequency subband 310, and the transmission of the SSB 315 is not limited to one subband 310. In some cases, each of the SSBs 315 may provide a timing indication indicating the timing associated with the RMSI control channel transmission 320 resource, and may also provide a frequency indication indicating the frequency associated with the RMSI control channel transmission 320 resource. Figure 3 In the example of , each SSB 315 may indicate system timing relative to a reference timing of an SSB start point 330 defined as a designated reference subband (eg, the first frequency subband 310 - a ).

[0090] In some cases, the SSB 315 transmitted in each frequency subband 310 may each include a PBCH payload associated with the time offset of the frequency subband 310 used to transmit the SSB 315. For example, the SSB PBCH may indicate T0 for the first frequency subband 310-a, may indicate T1 for the second frequency subband 310-b, may indicate T2 for the third frequency subband 310-c, and so on. Each of the different T0, T1, and T2 values ​​may indicate the timing of the RMSI window 325 relative to the reference timing of the SSB starting point 330. Such techniques may allow the base station to change the order in which the frequency subbands 310 are cycled in the SSB beam sweeping procedure. In other examples, the PBCH payload of each SSB 315 may be the same, but the SSB 315 may be interpreted differently (e.g., based on a predetermined timing offset associated with each frequency subband 310), which may allow the PBCH to be combined at a UE that may monitor multiple frequency subbands 310.

[0091] By using one frequency subband 310 at a time to transmit a beamformed SSB 315, the SSBPSD of the subband can be enhanced, which can enhance detectability at the UE. In addition, all UEs seeking to access the base station can run a searcher at one or more frequency subbands 310 and detect the SSB 315 transmitted on the subband 310, and thus the subband diversity of the SSB 315 can further enhance SSB detectability. In some cases, the UE can monitor multiple subbands 310 and detect multiple instances of the SSB 315, which can be combined at the UE in some cases to further enhance the detectability of these SSBs 315 at the UE. The beamformed RMSI control channel transmission 320 can be transmitted using any frequency subband 310. In some cases, the base station can select a frequency subband 310 for the beamformed RMSI control channel transmission 320 based on one or more channel metrics associated with each frequency subband 310, such as a long-term interference metric associated with the LBT procedure performed at each subband 310.

[0092] In this example, the beamformed SSB 315 may be transmitted without LBT. In such cases, the beamformed SSB 315 may follow parameters for no-LBT or LBT-free transmissions. In other cases, the beamformed SSB 315 may be transmitted using a reduced contention window LBT procedure (e.g., Cat2 LBT), and in the event of an LBT failure, specific instances of the beamformed SSB 315 may be discarded. Further, in this example, the beamformed RMSI control channel transmission 320 may be transmitted based on the LBT procedure. In some cases, as indicated above, the beamformed RMSI control channel transmission 320 may be transmitted at a fixed time relative to the SSB starting point 330, and instances of the RMSI control channel transmission 320 may be discarded in the event of an LBT failure. In other cases, such as in Figure 3 In the example shown, an RMSI window 325 may be provided, and upon successful completion of LBT (e.g., successful completion of a Cat4 LBT procedure), the beamformed RMSI control channel transmission 320 may be transmitted within the RMSI window 325. Figure 3 In the example of , the beamformed RMSI control channel transmission 320 may start at the beginning of the associated RMSI window 325, but in other cases, such transmission may start later within the RMSI window 325 once the LBT is clear. In such cases, the UE may search for the RMSI control channel transmission 320 within the RMSI window 325, and may stop searching for the RMSI control channel transmission 320 upon detection of RMSI or expiration of the RMSI window 325. In some cases, the start and end points of the RMSI window 325 may be determined based on the reception time of the particular transmit beam on which the UE detects the SSB, and the timing offset indicated in the SSB (e.g., relative to a frame boundary or SSB start 330).

[0093] like Figure 3As indicated in the example of , the beamformed RMSI control channel transmission 320 may use a different frequency sub-band 310 than the SSB 315. In some cases, the frequency location of the RMSI control channel transmission 320 may be indicated by the SSB 315. In some examples, the payload transmitted in the SSB 315 (e.g., in the PBCH of the SSB) may provide an explicit frequency offset for the RMSI control channel transmission 320. In other cases, the SSB 315 may provide an implicit indication of the frequency offset for the RMSI control channel transmission 320. For example, one or more PSS or SSS sequences of the SSB 315 may be partitioned with different partitions mapped to different frequency offsets (e.g., 252 base station cell IDs may be mapped to 1008 PSS / SSS sequences to indicate one of four available frequency offsets). In other cases, the RMSI control channel transmission 320 may also be fixed in a predetermined frequency sub-band 310, which may reduce the flexibility of the base station to select a sub-band that may be more advantageous. In some cases, information from the beamformed SSB 315 and the beamformed RMSI control channel transmission 320 may be used by the UE to determine resources and timing for transmitting a random access request to a base station to initiate system access.

[0094] Figure 4 An example of an SSB and RMSI resource configuration 400 that supports staggered SSBs in frequency subbands for beamformed wireless communications in accordance with aspects of the present disclosure is illustrated. In some examples, the SSB and RMSI resource configuration 400 can implement aspects of the wireless communication system 100 or 200. In this example, a base station and a UE (which may be Figure 1 In one example of a base station 105 or UE 115 of FIG. 2 , beamforming transmissions may be performed in frequency band 405. In some cases, frequency band 405 may be a high-band mmW band. Figure 3 Similar to the example of , several frequency sub-bands may be configured, including a first sub-band 410-a (F1), a second sub-band 410-b (F2), a third sub-band 410-c (F3), and a fourth sub-band 410-d (F4). Figure 4 Four frequency sub-bands 410 are illustrated in FIG. 4 , but other numbers of frequency sub-bands may be used, and the example of four frequency sub-bands is provided for purposes of illustration and discussion only.

[0095] In this example, with Figure 3Similar to the example of , the base station may transmit a first instance of a beamformed SSB 415-a via an SSB beam sweeping procedure using a first frequency sub-band 410-a, and the beamformed SSB 415-a may provide an indication of resources for the RMSI beam sweeping procedure in an RMSI window 435 used to transmit the beamformed RMSI control channel transmission 430. The RMSI beam sweeping procedure of the beamformed RMSI control channel transmission 430 may be transmitted via the same set of transmit beams as used for the SSB beam sweeping procedure, but may be transmitted using frequencies spanning multiple frequency sub-bands 410.

[0096] In this example, again, the staggered SSB 415 may cycle between each of the plurality of predefined frequency sub-bands 410. In this manner, when one SSB 415 is transmitted in one associated frequency sub-band 410 at a time, the PSD of the SSB 415 transmission may be maximized for each frequency sub-band 410, and the transmission of the SSB 415 is not limited to one sub-band 410. In this example, the base station may perform LBT before transmitting the SSB 415, and in each frequency sub-band 410, the SSB window 425 may define a time period during which the base station may transmit the associated SSB 415. In this case, the SSB 415 may be transmitted within the SSB window 425, wherein the start of the SSB 415 occurs after a successful LBT within the SSB window 425 is completed. In this example, a first instance 415-a of an SSB may begin after a gap 420-a in a first SSB window 425-a, a second instance 415-b of an SSB and a third instance 415c of an SSB may each begin at the beginning of their corresponding SSB windows 425-b and 425-c, and a fourth instance 415-d of an SSB may be transmitted after gap 420-b in a fourth SSB window 425-d. In some cases, the SSB 415 may indicate resources for beamformed RMSI control channel transmission 430. In some cases, as will be described with reference to Figure 5 As discussed in more detail, the time location of the RMSI control channel transmission may be indicated relative to a fixed SSB time boundary or SSB start point 427 or based on the relative location of the SSB 415 within each SSB window 425.

[0097] In some cases, the SSB 415 transmitted in each frequency subband 410 may each include a PBCH payload associated with the time offset of the frequency subband 410 used to transmit the SSB 415. For example, the SSB PBCH may indicate T0 for the first frequency subband 410-a, may indicate T1 for the second frequency subband 410-b, may indicate T2 for the third frequency subband 410-c, and so on. Each of the different T0, T1, and T2 values ​​may indicate the timing of the RMSI window 435 relative to the reference timing of the SSB starting point 427. Such techniques may allow the base station to change the order in which the frequency subbands 410 are cycled in the SSB beam sweeping procedure. In some cases, each PBCH payload may indicate a value of floor(T / N), where T is the time of the associated SSB window 425 and mod N is the repetition periodicity of the underlying SSB pattern, so that the SSB starting point 427 can be identified.

[0098] Additionally or alternatively, the beamformed RMSI control channel transmission 430 may be transmitted based on the LBT procedure, and instances of the RMSI control channel transmission 320 may be discarded in the event of LBT failure. Figure 4 As illustrated, an RMSI window 435 may be provided, and upon successful completion of LBT (e.g., successful completion of Cat4 LBT procedures), a beamformed RMSI control channel transmission 430 may be transmitted within the RMSI window 435. Figure 4 In the example of , once LBT is clear, the beamformed RMSI control channel transmission 430 may start after the time gap 440 within the RMSI window 435. In such a case, the UE may search for the RMSI control channel transmission 430 within the RMSI window 435, and may stop searching for the RMSI control channel transmission 430 upon detecting RMSI or the expiration of the RMSI window 435.

[0099] like Figure 4 As indicated in the example of , the beamformed RMSI control channel transmission 430 may use a different frequency sub-band 410 than the SSB 415. In some cases, the frequency location of the RMSI control channel transmission 430 may be indicated by the SSB 415. In some examples, the payload transmitted in the SSB 415 (e.g., in the PBCH of the SSB) may provide an explicit frequency offset for the RMSI control channel transmission 430. In other cases, the SSB 415 may provide an implicit indication of the frequency offset for the RMSI control channel transmission 430 (e.g., based on the partitioned PSS / SSS sequence. In some cases, information from the beamformed SSB 415 and the beamformed RMSI control channel transmission 430 may be used by the UE to determine resources and timing for transmitting a random access request to a base station to initiate system access.

[0100] In some cases, the start of RMSI window 435 may be fixed or variable relative to SSB window 425. In the case where RMSI window 435 is fixed relative to SSB window 425, the floating duration of RMSI window 435 may be limited by the position of SSB 415 within SSB window 425 to prevent latency from increasing. In the case where RMSI window 435 is variable, the floating position of SSB 415 may be used to indicate the timing of RMSI control channel transmission 430. In some cases, as will be referred to in Figure 5 Discussed in more detail, a quantized number of available SSB starting positions can be defined within the SSB window 425, and the position of the RMSI window 435 can be identified based on which SSB starting position is used within each SSB window 425 (e.g., such as explicitly indicated or implicitly indicated by using PSS / SSS sequence partitions). In other cases, the position of the RMSI window 435 can be identified relative to the SSB starting point 427 (i.e., based on a reference timing or frame boundary). Additionally, in some cases, the base station can begin SSB transmission with the first SSB on the first transmit beam (i.e., SSB 0 on transmit beam 0). In other cases, the base station can begin SSB transmission after LBT is cleared starting with SSB-K on transmit beam K, where K is an SSB index that is part of a predefined pattern relative to an SSB window 425 boundary or a frame boundary or an SSB starting point 427. Referring to Figure 5 Examples of RMSI timing and SSB start transmission are discussed in more detail.

[0101] Figure 5An example of a floating resource configuration 500 supporting staggered SSBs in frequency subbands for beamformed wireless communications in accordance with aspects of the present disclosure is illustrated. In some examples, the floating resource configuration 500 can implement aspects of the wireless communication system 100 or 200. In this example, a first subband 505 is illustrated that can be used for an SSB beam sweeping procedure to transmit an SSB 510, and additional frequency subbands for the staggered SSB beam sweeping procedure can use the same or similar techniques. In this example, the SSB 510 can be transmitted during an SSB window 525 after a successful LBT. As indicated above, in some cases, a quantized number of available SSB starting positions 530 can be defined within the SSB window 425, and the position of the RMSI window can be identified based on which SSB starting position 530 within the SSB window 525 is used. In some cases, the position within the SSB window 525 can be explicitly indicated (e.g., in the PBCH payload) or implicitly indicated (e.g., using PSS / SSS sequence partitions). In other cases, the location of the RMSI window may be identified relative to the SSB window 525 boundary (ie, based on a reference timing, frame boundary, or SSB start time).

[0102] In some cases, the base station may use a floating SSB pattern 535 or a fixed SSB pattern 545 to determine which SSB to begin transmitting after a successful LBT. In the floating SSB pattern 535, the LBT may be clear at time 540, and the base station may begin SSB transmission with a first SSB on a first transmit beam (i.e., SSB0 on ​​transmit beam 0), regardless of the time within the SSB window 525 when the LBT is clear. In the fixed SSB pattern 545, the base station may begin SSB transmission with SSB-K starting on transmit beam K after the LBT is clear at time 555, where K is an SSB index as part of a predefined pattern relative to a timing boundary 550, which may be a time associated with the start of an associated SSB window 525 or an SSB start time associated with an SSB beam sweeping procedure. In some cases, the SSB timing may use an additional bit to indicate a value of floor(T / N), where T is the time associated with a particular SSB window and mod N is the repetition periodicity of the underlying SSB pattern.

[0103] Figure 6 An example of a process flow 600 for supporting staggered SSB in frequency subbands for beamformed wireless communications in accordance with aspects of the present disclosure is illustrated. In some examples, the process flow 600 may implement aspects of the wireless communication system 100 or 200. In this example, the process flow 600 includes a UE 115-b and a base station 105-b, which may be referenced Figure 1 and 2 Examples of corresponding devices described.

[0104] At 605, the base station 105-b may optionally perform an LBT procedure. In some cases, the LBT procedure may be performed prior to transmitting the SSB in the SSB beam sweeping procedure. In some cases, the LBT procedure may provide the base station 105-b with an identification contention window (e.g., based on the LBT type, such as Cat2 or Cat4 LBT that provides a shorter or longer contention window), and after the contention window expires, an energy measurement may be performed on the frequency band to be used for SSB transmission. If the energy measurement is below a threshold, it may indicate that no other transmitter is using the channel and LBT is clear and the base station 105-b may begin transmitting. If the energy measurement is equal to or above the threshold, it may indicate that another transmitter is using the channel, and the base station 105-b may adjust the contention window and attempt LBT again after the contention window expires, or discard the transmission on the specific frequency band where LBT failed. In the event that the contention window is after the SSB window expires, the base station 105 - b may discard the SSB transmission and may initiate a subsequent SSB beam sweeping procedure based on the SSB beam sweeping periodicity.

[0105] At 610, the base station 105-b may transmit an SSB via an SSB beam sweeping procedure on a first frequency subband. In the case where an LBT procedure is used, the SSB may be transmitted in response to a successful LBT procedure. In some cases, several SSBs may be transmitted using several transmit beams in the SSB beam sweeping procedure. In this example, multiple other SSBs may be transmitted on other frequency subbands at staggered times at 615 to 620 such that only one frequency subband has an SSB transmission at a time.

[0106] At 625, UE 115-b may detect one or more SSBs from base station 105-b and identify RMSI resources (e.g., CORESET for transmitting RMSI PDCCH). In some cases, UE 115-b may run a searcher to monitor SSB transmissions via one or more frequency subbands. In some cases, UE 115-b may monitor SSBs on multiple subbands and combine multiple instances of SSBs. In some cases, RMSI resources may be identified based on one or more of an implicit indication or an explicit indication, or both, provided with the detected SSBs. In some cases, the SSB may indicate a time resource for the RMSI, a frequency resource for the RMSI, or both.

[0107] At 630, the base station 105-b may perform another LBT to determine whether a frequency subband associated with an RMSI control channel transmission (e.g., an RMSI PDCCH transmission) is clear for an RMSI beam sweeping procedure. At 635, if the LBT procedure is clear, the base station 105-b transmits the RMSI control channel transmission using the RMSI beam sweeping procedure. In some cases, the RMSI control channel transmission begins after the LBT procedure within the RMSI window is successful. In some cases, if the LBT fails, the base station 105-b may discard the RMSI control channel transmission. In the case where the base station 105-b transmits an RMSI control channel transmission, such transmission may span two or more frequency subbands.

[0108] At 640, UE 115-b may receive one or more of the RMSI control channel transmissions and determine one or more initial access parameters of base station 105-b. In some cases, the RMSI control channel transmission may indicate the location of an RMSI PDSCH transmission containing system information, which together with the SSB and RMSI CORESET provides parameters for initiating initial access. The one or more initial access parameters may include, for example, RACH timing and resources for a random access request to be transmitted to base station 105-b. In some cases, the initial access parameters may include one or more beamforming parameters associated with the random access resources used for initial access. At 645, UE 115-b and base station 105-b may perform an initial access procedure to establish a connection between UE 115-b and base station 105-b.

[0109] Figure 7 A block diagram 700 of a device 705 supporting staggered SSB in frequency subbands for beamformed wireless communications according to aspects of the present disclosure is shown. The device 705 may be an example of aspects of a UE 115 as described herein. The device 705 may include a receiver 710, a communication manager 715, and a transmitter 720. The device 705 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0110] Receiver 710 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to interleaved SSBs in frequency subbands for beamformed wireless communications, etc.). The information may be passed to other components of device 705. Receiver 710 may be a reference Fig.10 Examples of aspects of the described transceiver 1020. The receiver 710 may utilize a single antenna or a collection of antennas.

[0111] The communication manager 715 may monitor one or more frequency subbands in a set of frequency subbands for SSBs from a base station, wherein each frequency subband in the set of frequency subbands carries non-overlapping instances of an SSB; receive a first instance of an SSB via at least a first frequency subband in the set of frequency subbands based on the monitoring; determine a reference timing of the base station based on information from the first instance of the SSB or one or more of the frequency positions of the first frequency subband relative to a reference frequency subband of the set of frequency subbands; identify a resource set (e.g., CORESET) for control channel transmissions from the base station based on the reference timing, wherein the resource set spans two or more frequency subbands in the set of frequency subbands; and receive a control channel transmission (e.g., RMSI PDCCH transmission) via the resource set. The communication manager 715 may be an example of aspects of the communication manager 1010 described herein.

[0112] The communication manager 715 or its subcomponents may be implemented in hardware, in code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 715 or its subcomponents may be performed by a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

[0113] The communication manager 715 or its subcomponents may be physically located at various locations, including being distributed such that portions of functionality are implemented by one or more physical components at different physical locations. In some examples, according to aspects of the present disclosure, the communication manager 715 or its subcomponents may be separate and distinct components. In some examples, according to aspects of the present disclosure, the communication manager 715 or its subcomponents may be combined with one or more other hardware components (including, but not limited to, input / output (I / O) components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof).

[0114] The transmitter 720 may transmit signals generated by other components of the device 705. In some examples, the transmitter 720 may be co-located with the receiver 710 in a transceiver module. For example, the transmitter 720 may be a reference Fig.10 Examples of aspects of the described transceiver 1020. The transmitter 720 may utilize a single antenna or a collection of antennas.

[0115] Figure 8A block diagram 800 of a device 805 supporting staggered SSB in frequency subbands for beamformed wireless communications according to aspects of the present disclosure is shown. The device 805 may be an example of aspects of the device 705 or UE 115 as described herein. The device 805 may include a receiver 810, a communication manager 815, and a transmitter 840. The device 805 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0116] The receiver 810 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to interleaved SSBs in frequency subbands for beamformed wireless communications, etc.). The information may be passed to other components of the device 805. The receiver 810 may be a reference Fig.10 Examples of aspects of the described transceiver 1020. The receiver 810 may utilize a single antenna or a collection of antennas.

[0117] The communication manager 815 may be an example of aspects of the communication manager 715 as described herein. The communication manager 815 may include a subband identification component 820, an SSB monitoring manager 825, an SSB timing component 830, and an RMSI monitoring manager 835. The communication manager 815 may be an example of aspects of the communication manager 1010 as described herein.

[0118] Subband identification component 820 can monitor one or more frequency subbands in a set of frequency subbands for SSBs from a base station, wherein each frequency subband in the set of frequency subbands carries non-overlapping instances of an SSB.

[0119] The SSB monitoring manager 825 may receive a first instance of an SSB via at least a first frequency sub-band in the set of frequency sub-bands based on the monitoring.

[0120] The SSB timing component 830 can determine a reference timing for the base station based on one or more of information from the first instance of the SSB or a frequency location of the first frequency subband relative to a reference frequency subband of the set of frequency subbands.

[0121] The RMSI monitoring manager 835 may identify a resource set for control channel transmission from the base station based on the reference timing, wherein the resource set spans two or more frequency subbands in the set of frequency subbands; and receive the control channel transmission via the resource set.

[0122] In some implementations, the actions performed by the subband identification component 820, the SSB monitoring manager 825, the SSB timing component 830, and the RMSI monitoring manager 835 as described herein may facilitate the use of the reference Fig.10 The described processor 1040 enables the device 805 to perform various functions more efficiently. For example, the transmission of an SSB in a first beam sweeping procedure using a single frequency subband may facilitate a relatively increased PSD of the SSB transmission, which may correspondingly relatively increase the likelihood that the device 805 successfully detects the SSB. The control channel transmission (e.g., RMSI PDCCH transmission) in the second beam sweeping procedure may span additional frequency subbands and thus carry additional information related to the SSB transmission.

[0123] In this way, the device 805 can identify the beamforming characteristics of the second beam sweeping procedure based on the SSB, and thus the transmit beam of the second beam sweeping procedure can have a reduced PSD relative to the first beam sweeping procedure, but still provide sufficient reliability for detection by the device 805. When using these beamforming communication techniques, the device 805 can communicate with the base station with relatively higher efficiency and reliability, which can correspondingly reduce repeated transmissions and save frequency, time and / or space resources. Therefore, the device 805 can reduce the number of processing operations at the processor and other components of the device 805, which in turn can provide power savings and save processing resources for the processor of the device 805.

[0124] The transmitter 840 may transmit signals generated by other components of the device 805. In some examples, the transmitter 840 may be co-located with the receiver 810 in a transceiver module. For example, the transmitter 840 may be a reference Fig.10 Examples of various aspects of the transceiver 1020 described herein. For example, the transmitter 840 may be a reference Fig.14 Examples of aspects of transceiver 1420 are described.

[0125] Fig. 9 A block diagram 900 of a communication manager 905 supporting staggered SSB in frequency sub-bands for beamformed wireless communications in accordance with aspects of the present disclosure is shown. The communication manager 905 may be an example of aspects of the communication manager 715, the communication manager 815, or the communication manager 1010 described herein. The communication manager 905 may include a sub-band identification component 910, an SSB monitoring manager 915, an SSB timing component 920, an RMSI monitoring manager 925, and a beamforming manager 930. Each of these modules may communicate directly or indirectly with each other (e.g., via one or more buses).

[0126] The subband identification component 910 can monitor one or more frequency subbands in a set of frequency subbands to find SSBs from a base station, wherein each frequency subband in the set of frequency subbands carries non-overlapping instances of SSBs. In some cases, each frequency subband in the set of frequency subbands has a corresponding offset from a reference timing of the base station.

[0127] The SSB monitoring manager 915 may receive a first instance of the SSB via at least a first frequency subband in the set of frequency subbands based on the monitoring. In some examples, the SSB monitoring manager 915 may monitor two or more frequency subbands in the set of frequency subbands for respective instances of the SSB. In some examples, the SSB monitoring manager 915 may combine two or more instances of the SSB from two or more frequency subbands in the set of frequency subbands being monitored.

[0128] In some cases, each instance of an SSB transmitted via each frequency subband in a set of frequency subbands indicates the same set of resources used for control channel transmissions from a base station. In some cases, an SSB payload of each instance of the SSB indicates a reference timing of the base station relative to the corresponding instance of the SSB.

[0129] The SSB timing component 920 may determine a reference timing of the base station based on one or more of the information from the first instance of the SSB or the frequency position of the first frequency subband relative to a reference frequency subband of the set of frequency subbands. In some examples, the SSB timing component 920 may identify a fixed time periodicity for monitoring one or more frequency subbands in the set of frequency subbands for an SSB from a base station. In some examples, the SSB timing component 920 may identify an SSB time window for monitoring one or more frequency subbands in the set of frequency subbands for an SSB from a base station.

[0130] The RMSI monitoring manager 925 may identify a set of resources for control channel transmission from the base station based on the reference timing, wherein the set of resources spans two or more frequency subbands in the set of frequency subbands. In some examples, the RMSI monitoring manager 925 may receive the control channel transmission via the set of resources. In some examples, the RMSI monitoring manager 925 may determine a frequency offset of the set of resources relative to the first frequency subband based on information provided by the first instance of the SSB.

[0131] In some cases, the resource set includes a predetermined start time resource for the control channel transmission relative to a reference frequency subband in the set of frequency subbands. In some cases, the resource set includes a control channel time window during which the UE will monitor the control channel transmission. In some cases, the duration of the control channel time window is based on the LBT procedure duration and the number of LBT attempts that the base station is configured to perform before discarding the control channel transmission.

[0132] The beamforming manager 930 may identify one or more transmit beams for receiving the SSB and the system information. In some cases, the SSB is transmitted using an SSB beam sweeping procedure, wherein a series of consecutive transmit beams within each frequency subband each carry a respective SSB, and wherein the same initial transmit beam in the series of consecutive transmit beams is used regardless of when the SSB beam sweeping procedure starts within the SSB time window. In some cases, the SSB is transmitted using an SSB beam sweeping procedure, wherein a series of consecutive transmit beams each carry a respective SSB with an SSB index indicating a position of the SSB relative to a frame boundary within each frequency subband in the set of frequency subbands.

[0133] Fig.10 A diagram of a system 1000 including a device 1005 supporting staggered SSB in frequency subbands for beamformed wireless communications according to aspects of the present disclosure is shown. The device 1005 may be an example of or include components of a device 705, a device 805, or a UE 115 as described herein. The device 1005 may include components for two-way voice and data communications, including components for transmitting and receiving communications, including a communication manager 1010, an I / O controller 1015, a transceiver 1020, an antenna 1025, a memory 1030, and a processor 1040. These components may be in electronic communication via one or more buses (e.g., a bus 1045).

[0134] The communication manager 1010 may monitor one or more frequency subbands in a frequency subband set to search for SSBs from a base station, wherein each frequency subband in the frequency subband set carries non-overlapping instances of an SSB; receive a first instance of an SSB via at least a first frequency subband in the frequency subband set based on the monitoring; determine a reference timing of the base station based on information from the first instance of the SSB or one or more of the frequency positions of the first frequency subband relative to a reference frequency subband in the frequency subband set; identify a resource set for a control channel transmission from the base station based on the reference timing, wherein the resource set spans two or more frequency subbands in the frequency subband set; and receive the control channel transmission via the resource set.

[0135] I / O controller 1015 can manage input and output signals of device 1005. I / O controller 1015 can also manage peripheral devices that are not integrated into device 1005. In some cases, I / O controller 1015 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 1015 can utilize an operating system, such as Or another known operating system. In other cases, I / O controller 1015 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 1015 may be implemented as part of a processor. In some cases, a user may interact with device 1005 via I / O controller 1015 or via hardware components controlled by I / O controller 1015.

[0136] The transceiver 1020 may communicate bidirectionally via one or more antennas, wired or wireless links, as described herein. For example, the transceiver 1020 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 1020 may also include a modem to modulate packets and provide the modulated packets to an antenna for transmission, and demodulate packets received from an antenna.

[0137] In some cases, a wireless device may include a single antenna 1025. However, in some cases, the device may have more than one antenna 1025, which may be capable of transmitting or receiving multiple wireless transmissions concurrently.

[0138] Memory 1030 may include random access memory (RAM) and read-only memory (ROM). Memory 1030 may store computer-readable, computer-executable code 1035 including instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, memory 1030 may include, among other things, a basic input / output system (BIOS), which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0139] Processor 1040 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, processor 1040 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into processor 1040. Processor 1040 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1030) to cause device 1005 to perform various functions (e.g., functions or tasks of supporting interleaved SSBs in frequency subbands for beamformed wireless communications).

[0140] The code 1035 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 1035 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 1035 may not be directly executable by the processor 1040, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0141] Fig.11 A block diagram 1100 of a device 1105 supporting interleaved SSB in frequency subbands for beamformed wireless communications according to aspects of the present disclosure is shown. The device 1105 may be an example of aspects of a base station 105 as described herein. The device 1105 may include a receiver 1110, a communication manager 1115, and a transmitter 1120. The device 1105 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0142] The receiver 1110 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to interleaved SSBs in frequency subbands for beamformed wireless communications, etc.). The information may be passed to other components of the device 1105. The receiver 1110 may be a reference Fig.14 Examples of various aspects of the described transceiver 1420. The receiver 1110 may utilize a single antenna or a collection of antennas.

[0143] The communication manager 1115 may identify a set of frequency subbands for transmitting a set of SSBs via a set of transmit beams in an SSB beam sweeping procedure; identify a set of resources for transmitting a set of RMSI control channel transmissions via the set of transmit beams in an RMSI beam sweeping procedure, wherein the set of resources spans two or more frequency subbands in the set of frequency subbands; in response to completing an LBT procedure, transmit the set of RMSI control channel transmissions via the set of transmit beams in the RMSI beam sweeping procedure using the set of resources; transmit the set of SSBs via the set of transmit beams in each subband in the set of subbands in the SSB beam sweeping procedure, wherein the SSB beam sweeping procedure is performed separately during non-overlapping time periods for each frequency subband in the set of frequency subbands, and wherein each SSB in the set of SSBs indicates a reference timing of a base station, the reference timing being used to identify the set of resources; and perform an LBT procedure to initiate the set of RMSI control channel transmissions. The communication manager 1115 may be an example of aspects of the communication manager 1410 described herein.

[0144] The communication manager 1115 or its subcomponents may be implemented in hardware, in code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 1115 or its subcomponents may be performed by a general purpose processor, DSP, ASIC, FPGA or other programmable logic device designed to perform the functions described in this disclosure, discrete gate or transistor logic, discrete hardware components, or any combination thereof.

[0145] The communication manager 1115 or its subcomponents may be physically located at various locations, including being distributed such that portions of functionality are implemented by one or more physical components at different physical locations. In some examples, according to aspects of the present disclosure, the communication manager 1115 or its subcomponents may be separate and distinct components. In some examples, according to aspects of the present disclosure, the communication manager 1115 or its subcomponents may be combined with one or more other hardware components (including, but not limited to, input / output (I / O) components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof).

[0146] The transmitter 1120 may transmit signals generated by other components of the device 1105. In some examples, the transmitter 1120 may be co-located with the receiver 1110 in a transceiver module. For example, the transmitter 1120 may be a reference Fig.14 Examples of various aspects of the transceiver 1420 are described. For example, the transmitter 1120 may be a reference Fig.14 Examples of aspects of transceiver 1420 are described.

[0147] Fig.12 A block diagram 1200 of a device 1205 supporting staggered SSB in frequency subbands for beamformed wireless communications according to aspects of the present disclosure is shown. The device 1205 may be an example of aspects of the device 1105 or base station 105 as described herein. The device 1205 may include a receiver 1210, a communication manager 1215, and a transmitter 1240. The device 1205 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0148] Receiver 1210 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to interleaved SSBs in frequency subbands for beamformed wireless communications, etc.). The information may be passed to other components of device 1205. Receiver 1210 may be a reference Fig.14 Examples of various aspects of the described transceiver 1420. The receiver 1210 may utilize a single antenna or a collection of antennas.

[0149] The communication manager 1215 may be an example of aspects of the communication manager 1115 as described herein. The communication manager 1215 may include a subband identification component 1220, a RMSI manager 1225, an SSB manager 1230, and an LBT manager 1235. The communication manager 1215 may be an example of aspects of the communication manager 1410 as described herein.

[0150] The subband identification component 1220 can identify a set of frequency subbands for transmitting a set of SSBs via a set of transmit beams in an SSB beam sweeping procedure.

[0151] The RMSI manager 1225 may identify a resource set for transmitting an RMSI control channel transmission set via the transmit beam set in an RMSI beam sweeping procedure, wherein the resource set spans two or more frequency subbands in the frequency subband set; and in response to completing the LBT procedure, use the resource set to transmit the RMSI control channel transmission set via the transmit beam set in the RMSI beam sweeping procedure.

[0152] The SSB manager 1230 may transmit the SSB set via a transmit beam set in each subband in the subband set in the SSB beam sweeping procedure, wherein the SSB beam sweeping procedure is performed separately during non-overlapping time periods for each frequency subband in the frequency subband set, and wherein each SSB in the SSB set indicates a reference timing of a base station, which reference timing is used to identify the resource set.

[0153] The LBT manager 1235 may execute LBT procedures to initiate a set of RMSI control channel transmissions.

[0154] In some implementations, the actions performed by the subband identification component 1220, the RMSI manager 1225, the SSB manager 1230, and the LBT manager 1235 as described herein may facilitate the use of the reference Fig.14 The described processor 1440 enables the device 1205 to perform various functions more efficiently. For example, the device 1205 may transmit the SSB to a receiving device (e.g., UE) in a first beam sweeping procedure using a single frequency subband (e.g., selected by the device 1205 based on a long-term interference metric), which may facilitate a relatively increased PSD of the SSB transmission and, accordingly, may relatively increase the likelihood that the receiving device successfully detects the SSB. The device 1205 may transmit a control channel transmission (e.g., an RMSI PDCCH transmission) in a second beam sweeping procedure that spans additional frequency subbands and, therefore, carries additional information related to the SSB transmission.

[0155] Thus, the device 1205 can cause the receiving device to identify certain beamforming characteristics of the second beam sweeping procedure based on the SSB transmitted by the device 1205 in the first beam sweeping procedure, and thus the transmit beam of the second beam sweeping procedure can have a reduced PSD relative to the first beam sweeping procedure, but still provide sufficient reliability for detection by the receiving device. When using these beamforming communication techniques, the device 1205 can communicate with a receiving device (e.g., one of multiple UEs with which the device 1205 can communicate) with relatively higher efficiency and reliability, which can correspondingly reduce repeated transmissions and save frequency, time, and / or space resources. Accordingly, the device 1205 can reduce the number of processing operations at the processor and other components of the device 1205, which in turn can provide power savings and save processing resources for the processor of the device 1205.

[0156] Transmitter 1240 may transmit signals generated by other components of device 1205. In some examples, transmitter 1240 may be co-located with receiver 1210 in a transceiver module. For example, transmitter 1240 may be a reference Fig.14 Examples of aspects of the described transceiver 1420. The transmitter 1240 may include a single antenna or a collection of antennas.

[0157] Fig.13 A block diagram 1300 of a communication manager 1305 supporting staggered SSB in frequency sub-bands for beamformed wireless communications in accordance with aspects of the present disclosure is shown. The communication manager 1305 may be an example of aspects of the communication manager 1115, the communication manager 1215, or the communication manager 1410 described herein. The communication manager 1305 may include a sub-band identification component 1310, an RMSI manager 1315, an SSB manager 1320, an LBT manager 1325, an SSB timing component 1330, and an RMSI timing component 1335. Each of these modules may communicate directly or indirectly with each other (e.g., via one or more buses).

[0158] The subband identification component 1310 can identify a set of frequency subbands for transmitting a set of SSBs via a set of transmit beams in an SSB beam sweeping procedure.

[0159] The RMSI manager 1315 may identify a resource set for transmitting an RMSI control channel transmission set via the transmit beam set in an RMSI beam sweeping procedure, wherein the resource set spans two or more frequency subbands in the frequency subband set. In some examples, the RMSI manager 1315 may use the resource set to transmit the RMSI control channel transmission set via the transmit beam set in the RMSI beam sweeping procedure in response to completing the LBT procedure.

[0160] The SSB manager 1320 may transmit the SSB set in each subband in the subband set via a transmit beam set in the SSB beam sweeping procedure, wherein the SSB beam sweeping procedure is performed separately during non-overlapping time periods for each frequency subband in the frequency subband set, and wherein each SSB in the SSB set indicates a reference timing of a base station, the reference timing being used to identify the resource set. In some examples, the SSB manager 1320 may identify an SSB time window for each frequency subband in the frequency subband set for transmitting the SSB set. In some cases, each of the SSBs is transmitted according to a fixed time periodicity without performing an LBT procedure.

[0161] In some cases, the same initial transmit beam of the SSB beam sweeping procedure is used regardless of when the SSB beam sweeping procedure begins within the SSB time window. In some cases, each SSB in the set of SSBs has an associated SSB index that indicates a position of the SSB within a predetermined SSB pattern relative to a frame boundary within each frequency subband in the set of frequency subbands.

[0162] In some cases, each of the SSBs transmitted via each frequency subband in the set of frequency subbands indicates the same set of resources used for RMSI control channel transmission. In some cases, the SSB payload of each of the SSBs indicates a reference timing of the base station relative to the corresponding SSB. In some cases, each SSB in the set of SSBs provides an indication of a frequency offset of the set of resources relative to a corresponding frequency subband of the set of frequency subbands used to transmit the SSB.

[0163] The LBT manager 1325 may perform an LBT procedure to initiate a set of RMSI control channel transmissions. In some examples, the LBT manager 1325 may perform an LBT procedure on each frequency subband in a set of frequency subbands during an SSB time window prior to transmitting a set of SSBs, wherein the set of SSBs is transmitted in response to successfully completing the LBT procedure.

[0164] SSB timing component 1330 can determine SSB timing information provided with the SSB transmission.In some cases, each frequency subband in the set of frequency subbands has a corresponding time offset from a reference timing of the base station.

[0165] The RMSI timing component 1335 may determine RMSI timing information provided with the SSB transmission. In some cases, the resource set includes a predetermined start time resource for RMSI control channel transmission relative to a reference subband in the frequency subband set. In some cases, the resource set is associated with an RMSI time window during which an RMSI beam sweeping procedure is to be performed, and wherein the start time of the RMSI beam sweeping procedure within the RMSI time window depends on the completion time of the LBT procedure used to initiate the RMSI control channel transmission set. In some cases, the duration of the RMSI time window is based on the duration of the LBT procedure and the number of LBT attempts that the base station is configured to perform before discarding the RMSI control channel transmission set.

[0166] Fig.14 A diagram of a system 1400 including a device 1405 supporting staggered SSB in frequency subbands for beamformed wireless communications in accordance with aspects of the present disclosure is shown. The device 1405 may be an example of a device 1105, a device 1205, or a base station 105 as described herein or include components of the above devices. The device 1405 may include components for two-way voice and data communications, including components for transmitting and receiving communications, including a communication manager 1410, a network communication manager 1415, a transceiver 1420, an antenna 1425, a memory 1430, a processor 1440, and an inter-station communication manager 1445. These components may be in electronic communication via one or more buses (e.g., bus 1450).

[0167] The communication manager 1410 may identify a frequency subband set for transmitting a set of SSBs via a transmit beam set in an SSB beam sweeping procedure; identify a resource set for transmitting a set of RMSI control channel transmissions via the transmit beam set in an RMSI beam sweeping procedure, wherein the resource set spans two or more frequency subbands in the frequency subband set; in response to completing an LBT procedure, transmit the set of RMSI control channel transmissions via the transmit beam set in the RMSI beam sweeping procedure using the resource set; transmit the set of SSBs via the transmit beam set in each subband in the subband set in the SSB beam sweeping procedure, wherein the SSB beam sweeping procedure is performed separately during non-overlapping time periods for each frequency subband in the frequency subband set, and wherein each SSB in the set of SSBs indicates a reference timing of a base station, the reference timing being used to identify the resource set; and execute the LBT procedure to initiate the RMSI control channel transmission set.

[0168] The network communications manager 1415 may manage communications with the core network (eg, via one or more wired backhaul links). For example, the network communications manager 1415 may manage the delivery of data communications for client devices, such as one or more UEs 115 .

[0169] The transceiver 1420 may communicate bidirectionally via one or more antennas, wired or wireless links, as described herein. For example, the transceiver 1420 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 1420 may also include a modem to modulate packets and provide the modulated packets to an antenna for transmission, and demodulate packets received from an antenna.

[0170] In some cases, a wireless device may include a single antenna 1425. However, in some cases, the device may have more than one antenna 1425, which may be capable of transmitting or receiving multiple wireless transmissions concurrently.

[0171] Memory 1430 may include RAM, ROM, or a combination thereof. Memory 1430 may store computer readable code 1435 including instructions that, when executed by a processor (e.g., processor 1440), cause the device to perform various functions described herein. In some cases, memory 1430 may include, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0172] Processor 1440 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, processor 1440 may be configured to operate a memory array using a memory controller. In some cases, the memory controller may be integrated into processor 1440. Processor 1440 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1430) to cause device 1405 to perform various functions (e.g., functions or tasks of supporting interleaved SSBs in frequency subbands for beamformed wireless communications).

[0173] The inter-site communication manager 1445 may manage communications with other base stations 105 and may include a controller or scheduler for controlling communications with UE 115 in cooperation with other base stations 105. For example, the inter-site communication manager 1445 may coordinate scheduling of transmissions to UE 115 for various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-site communication manager 1445 may provide an X2 interface within an LTE / LTE-A wireless communication network technology to provide communications between base stations 105.

[0174] The code 1435 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 1435 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 1435 may not be directly executable by the processor 1440, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0175] Fig.15 A flow chart illustrating a method 1500 for supporting staggered SSB in frequency subbands for beamformed wireless communications according to aspects of the present disclosure is shown. The operations of the method 1500 may be implemented by a UE 115 or components thereof as described herein. For example, the operations of the method 1500 may be implemented by a UE 115 or components thereof as described herein. Figures 7 to 10 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the following functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the following functions.

[0176] At 1505, the UE may monitor one or more frequency subbands in a set of frequency subbands for SSBs from a base station, wherein each frequency subband in the set of frequency subbands carries non-overlapping instances of SSBs. The operations of 1505 may be performed according to the methods described herein. In some examples, aspects of the operations of 1505 may be performed as described with reference to Figures 7 to 10 The subband identification component described is performed.

[0177] At 1510, the UE may receive a first instance of an SSB via at least a first frequency subband in the set of frequency subbands based on the monitoring. The operations of 1510 may be performed according to the methods described herein. In some examples, aspects of the operations of 1510 may be performed as described with reference to Figures 7 to 10 The SSB monitoring manager described in this document is used to perform the following operations:

[0178] At 1515, the UE may determine a reference timing of a base station based on one or more of the information from the first instance of the SSB or the frequency position of the first frequency subband relative to a reference frequency subband of the set of frequency subbands. The operations of 1515 may be performed according to the methods described herein. In some examples, aspects of the operations of 1515 may be performed as described with reference to Figures 7 to 10 The SSB timing components described are implemented.

[0179] At 1520, the UE may identify a set of resources for control channel transmission from the base station based on the reference timing, wherein the set of resources spans two or more frequency subbands in the set of frequency subbands. The operations of 1520 may be performed according to the methods described herein. In some examples, aspects of the operations of 1520 may be performed as described with reference to Figures 7 to 10 The RMSI monitoring manager described above is used to perform the

[0180] At 1525, the UE may receive the control channel transmission via the resource set. The operations of 1525 may be performed according to the methods described herein. In some examples, aspects of the operations of 1525 may be performed as described with reference to Figures 7 to 10 The RMSI monitoring manager described above is used to perform the

[0181] Fig.16 1 is a flow chart illustrating a method 1600 for supporting staggered SSB in frequency subbands for beamformed wireless communications in accordance with aspects of the present disclosure. The operations of the method 1600 may be implemented by a UE 115 or components thereof as described herein. For example, the operations of the method 1600 may be implemented by a UE 115 or components thereof as described herein. Figures 7 to 10 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the following functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the following functions.

[0182] At 1605, the UE may monitor two or more frequency subbands in the set of frequency subbands to find corresponding instances of the SSB. The operations of 1605 may be performed according to the methods described herein. In some examples, aspects of the operations of 1605 may be performed as described with reference to Figures 7 to 10 The SSB monitoring manager described in this document is used to perform the following operations:

[0183] At 1610, the UE may combine two or more instances of the SSB from two or more monitored frequency subbands in the set of frequency subbands. The operations of 1610 may be performed according to the methods described herein. In some examples, aspects of the operations of 1610 may be performed as described with reference to Figures 7 to 10 The SSB monitoring manager described in this document is used to perform the following operations:

[0184] At 1615, the UE may determine a reference timing of the base station based on one or more of the information from the first instance of the SSB or the frequency position of the first frequency subband relative to the reference frequency subband of the set of frequency subbands. The operations of 1615 may be performed according to the methods described herein. In some examples, aspects of the operations of 1615 may be performed as described with reference to Figures 7 to 10 The SSB timing components described are implemented.

[0185] At 1620, the UE may identify a set of resources for control channel transmission from the base station based on the reference timing, wherein the set of resources spans two or more frequency subbands in the set of frequency subbands. The operations of 1620 may be performed according to the methods described herein. In some examples, aspects of the operations of 1620 may be performed as described with reference to Figures 7 to 10 The RMSI monitoring manager described in this document is used to perform the following operations:

[0186] At 1625, the UE may receive the control channel transmission via the resource set. The operations of 1625 may be performed according to the methods described herein. In some examples, aspects of the operations of 1625 may be performed as described with reference to Figures 7 to 10 The RMSI monitoring manager described above is used to perform the

[0187] Fig.17 1 is a flow chart illustrating a method 1700 for supporting staggered SSB in frequency subbands for beamformed wireless communications in accordance with aspects of the present disclosure. The operations of the method 1700 may be implemented by a UE 115 or components thereof as described herein. For example, the operations of the method 1700 may be implemented by a UE 115 or components thereof as described herein. Figures 7 to 10 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the following functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the following functions.

[0188] At 1705, the UE may monitor one or more frequency subbands in a set of frequency subbands for SSBs from a base station, wherein each frequency subband in the set of frequency subbands carries non-overlapping instances of SSBs. The operations of 1705 may be performed according to the methods described herein. In some examples, aspects of the operations of 1705 may be performed as described with reference to Figures 7 to 10 The subband identification component described is performed.

[0189] At 1710, the UE may receive a first instance of an SSB via at least a first frequency subband in the set of frequency subbands based on the monitoring. The operations of 1710 may be performed according to the methods described herein. In some examples, aspects of the operations of 1710 may be performed as described with reference to Figures 7 to 10 The SSB monitoring manager described in this document is used to perform the following operations:

[0190] At 1715, the UE may determine a reference timing of the base station based on one or more of the information from the first instance of the SSB or the frequency position of the first frequency subband relative to the reference frequency subband of the set of frequency subbands. The operations of 1715 may be performed according to the methods described herein. In some examples, aspects of the operations of 1715 may be performed as described with reference to Figures 7 to 10The SSB timing components described are implemented.

[0191] At 1720, the UE may identify a set of resources for control channel transmission from the base station based on the reference timing, wherein the set of resources spans two or more frequency subbands in the set of frequency subbands. The operations of 1720 may be performed according to the methods described herein. In some examples, aspects of the operations of 1720 may be performed as described with reference to Figures 7 to 10 The RMSI monitoring manager described above is used to perform the

[0192] At 1725, the UE may receive the control channel transmission via the resource set. The operations of 1725 may be performed according to the methods described herein. In some examples, aspects of the operations of 1725 may be performed as described with reference to Figures 7 to 10 The RMSI monitoring manager described above is used to perform the

[0193] At 1730, the UE may identify a fixed time periodicity for monitoring one or more frequency subbands in the set of frequency subbands to look for SSBs from the base station. The operations of 1730 may be performed according to the methods described herein. In some examples, aspects of the operations of 1730 may be performed as described with reference to Figures 7 to 10 The SSB timing components described are implemented.

[0194] Fig.18 A flow chart illustrating a method 1800 for supporting staggered SSB in frequency subbands for beamformed wireless communications according to aspects of the present disclosure is shown. The operations of the method 1800 may be implemented by a base station 105 or components thereof as described herein. For example, the operations of the method 1800 may be implemented by a base station 105 or components thereof as described herein. Figures 11 to 14 In some examples, the base station may execute an instruction set to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described below.

[0195] At 1805, the base station may identify a set of frequency subbands for transmitting a set of SSBs via a set of transmit beams in an SSB beam sweeping procedure. The operations of 1805 may be performed according to the methods described herein. In some examples, aspects of the operations of 1805 may be performed as described with reference to Figures 11 to 14 The subband identification component described is performed.

[0196] At 1810, the base station may identify a resource set for transmitting a set of RMSI control channel transmissions via the set of transmit beams in a RMSI beam sweeping procedure, wherein the resource set spans two or more frequency subbands in the set of frequency subbands. The operations of 1810 may be performed according to the methods described herein. In some examples, aspects of the operations of 1810 may be performed as described with reference to Figures 11 to 14 The RMSI manager described in this document is implemented as follows:

[0197] At 1815, the base station may transmit the set of SSBs in each subband in the set of subbands via a set of transmit beams in the SSB beam sweeping procedure, wherein the SSB beam sweeping procedure is performed separately during non-overlapping time periods for each frequency subband in the set of frequency subbands, and wherein each SSB in the set of SSBs indicates a reference timing of the base station, the reference timing being used to identify the set of resources. The operations of 1815 may be performed according to the methods described herein. In some examples, aspects of the operations of 1815 may be performed as described with reference to Figures 11 to 14 Described in the SSB manager to perform.

[0198] At 1820, the base station may perform an LBT procedure to initiate a RMSI control channel transmission set. The operations of 1820 may be performed according to the methods described herein. In some examples, aspects of the operations of 1820 may be performed as described with reference to Figures 11 to 14 Description of the LBT manager to perform.

[0199] At 1825, the base station may, in response to completing the LBT procedure, transmit a set of RMSI control channel transmissions via a set of transmit beams in a RMSI beam sweeping procedure using the set of resources. The operations of 1825 may be performed according to the methods described herein. In some examples, aspects of the operations of 1825 may be performed as described with reference to Figures 11 to 14 The RMSI manager described in this document is implemented as follows:

[0200] Fig.19 A flow chart illustrating a method 1900 for supporting staggered SSB in frequency subbands for beamformed wireless communications according to aspects of the present disclosure is shown. The operations of the method 1900 may be implemented by a base station 105 or components thereof as described herein. For example, the operations of the method 1900 may be implemented by a base station 105 or components thereof as described herein. Figures 11 to 14 In some examples, the base station may execute an instruction set to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described below.

[0201] At 1905, the base station may identify a set of frequency subbands for transmitting a set of SSBs via a set of transmit beams in an SSB beam sweeping procedure. The operations of 1905 may be performed according to the methods described herein. In some examples, aspects of the operations of 1905 may be performed as described with reference to Figures 11 to 14 The subband identification component described is performed.

[0202] At 1910, the base station may identify an SSB time window for each frequency subband in a set of frequency subbands for transmitting a set of SSBs. The operations of 1910 may be performed according to the methods described herein. In some examples, aspects of the operations of 1910 may be performed as described with reference to Figures 11 to 14 Described in the SSB manager to perform.

[0203] At 1915, the base station may identify a resource set for transmitting a set of RMSI control channel transmissions via the set of transmit beams in a RMSI beam sweeping procedure, wherein the resource set spans two or more frequency subbands in the set of frequency subbands. The operations of 1915 may be performed according to the methods described herein. In some examples, aspects of the operations of 1915 may be performed as described with reference to Figures 11 to 14 The RMSI manager described in this document is implemented as follows:

[0204] At 1920, the base station may perform an LBT procedure on each frequency subband in the set of frequency subbands during the SSB time window before transmitting the set of SSBs, wherein the set of SSBs is transmitted in response to successfully completing the LBT procedure. The operations of 1920 may be performed according to the methods described herein. In some examples, aspects of the operations of 1920 may be performed as described with reference to Figures 11 to 14 Description of the LBT manager to perform.

[0205] At 1925, the base station may transmit the SSB set in each subband in the set of subbands via a transmit beam set in the SSB beam sweeping procedure, wherein the SSB beam sweeping procedure is performed separately during non-overlapping time periods for each frequency subband in the set of frequency subbands, and wherein each SSB in the set of SSBs indicates a reference timing of the base station, the reference timing being used to identify the set of resources. The operations of 1925 may be performed according to the methods described herein. In some examples, aspects of the operations of 1925 may be performed as described with reference to Figures 11 to 14 Described in the SSB manager to perform.

[0206] At 1930, the base station may perform an LBT procedure to initiate a RMSI control channel transmission set. The operations of 1930 may be performed according to the methods described herein. In some examples, aspects of the operations of 1930 may be performed as described with reference to Figures 11 to 14 Description of the LBT manager to perform.

[0207] At 1935, the base station may, in response to completing the LBT procedure, transmit an RMSI control channel transmission set via a transmit beam set in an RMSI beam sweeping procedure using the resource set. The operations of 1935 may be performed according to the methods described herein. In some examples, aspects of the operations of 1935 may be performed as described with reference to Figures 11 to 14The RMSI manager described in this document is implemented as follows:

[0208] It should be noted that the methods described herein describe possible implementations, and that the various operations and steps may be rearranged or otherwise modified and other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0209] The technology described herein can be used in various wireless communication systems, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA) and other systems. CDMA systems can implement radio technologies such as CDMA2000, Universal Terrestrial Radio Access (UTRA). CDMA2000 covers IS-2000, IS-95 and IS-856 standards. IS-2000 versions are generally referred to as CDMA2000 1X, 1X, etc. IS-856 (TIA-856) is generally referred to as CDMA2000 1xEV-DO, High Rate Packet Data (HRPD), etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. TDMA systems can implement radio technologies such as Global System for Mobile Communications (GSM).

[0210] OFDMA systems can implement radio technologies such as Ultra Mobile Broadband (UMB), E-UTRA, Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, etc. UTRA and E-UTRA are part of Universal Mobile Telecommunications System (UMTS). LTE, LTE-A, and LTE-A Pro are versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, LTE-A Pro, NR, and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). CDMA2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). The techniques described herein can be used for the systems and radio technologies mentioned herein as well as for other systems and radio technologies. Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein may also be applicable to applications other than LTE, LTE-A, LTE-A Pro, or NR applications.

[0211] A macro cell generally covers a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access by UEs with service subscriptions to a network provider. A small cell may be associated with a lower power base station (compared to a macro cell), and the small cell may operate in the same or different (e.g., licensed, unlicensed, etc.) frequency band as the macro cell. According to various examples, a small cell may include a pico cell, a femto cell, and a micro cell. A pico cell, for example, may cover a smaller geographic area and may allow unrestricted access by UEs with service subscriptions to a network provider. A femto cell may also cover a smaller geographic area (e.g., a residence) and may provide restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs of users in the residence, etc.). An eNB for a macro cell may be referred to as a macro eNB. An eNB for a small cell may be referred to as a small cell eNB, a pico eNB, a femto eNB, or a home eNB. An eNB may support one or more (eg, two, three, four, etc.) cells and may also support communication using one or more component carriers.

[0212] The wireless communication systems described herein may support synchronous or asynchronous operation. For synchronous operation, each base station may have similar frame timing, and transmissions from different base stations may be roughly aligned in time. For asynchronous operation, each base station may have different frame timing, and transmissions from different base stations may not be aligned in time. The techniques described herein may be used for synchronous or asynchronous operation.

[0213] The information and signals described herein may be represented using any of a variety of different techniques and technologies. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout this description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0214] The various illustrative blocks and modules described in conjunction with the disclosure herein may be implemented or executed with a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0215] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted by a computer-readable medium as one or more instructions or codes. Other examples and implementations fall within the scope of the present disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination thereof. Features that implement the functions may also be physically located in various locations, including being distributed so that parts of the functions are implemented at different physical locations.

[0216] Computer-readable medium includes both non-transient computer storage medium and communication medium, and it includes any medium that facilitates computer program to transfer from one place to another.Non-transient storage medium can be any available medium that can be accessed by general or special-purpose computer.As an example and not limitation, non-transient computer-readable medium can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage, disk storage or other magnetic storage device, or can be used to carry or store instruction or data structure form of desired program code means and can be accessed by general or special-purpose computer or general or special-purpose processor any other non-transient medium.Any connection is also properly referred to as computer-readable medium.For example, if software is transmitted from website, server or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technology such as infrared, radio and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL or wireless technology such as infrared, radio and microwave are just included in the definition of medium. Disk and disc as used herein include CDs, laser discs, optical discs, digital versatile discs (DVDs), floppy disks, and Blu-ray discs, where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0217] As used herein (including in the claims), "or" used in a list of items (e.g., a list of items with a phrase such as "at least one of" or "one or more of") indicates an inclusive list, so that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Similarly, as used herein, the phrase "based on" should not be interpreted as referring to a closed set of conditions. For example, an exemplary step described as "based on condition A" may be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0218] In the accompanying drawings, similar components or features may have the same reference number. In addition, various components of the same type may be distinguished by following the reference number with a dash and a second reference number that distinguishes between similar components. If only the first reference number is used in the specification, the description may apply to any of the similar components having the same first reference number regardless of the second reference number, or other subsequent reference numbers.

[0219] The descriptions set forth herein in conjunction with the accompanying drawings describe example configurations and do not represent all examples that may be implemented or that fall within the scope of the claims. The term "exemplary" as used herein means "used as an example, instance, or illustration" and does not mean "better than" or "better than other examples." This detailed description includes specific details to provide an understanding of the described techniques. However, these techniques may be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0220] The description herein is provided to enable those skilled in the art to make or use the present disclosure. Various modifications to the present disclosure will be apparent to those skilled in the art, and the universal principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Thus, the present disclosure is not limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a user equipment (UE), comprising: monitoring one or more frequency subbands of a plurality of frequency subbands for a synchronization signal block (SSB) from a base station, wherein each frequency subband of the plurality of frequency subbands carries non-overlapping instances of the SSB that do not overlap in frequency or time with other instances of the SSB; receiving a first instance of the SSB via at least a first frequency sub-band of the plurality of frequency sub-bands based at least in part on the monitoring; determining a reference timing of the base station based at least in part on one or more of information from the first instance of the SSB or a frequency location of the first frequency subband relative to a reference frequency subband of the plurality of frequency subbands; identifying a set of resources for control channel transmission from the base station based at least in part on the reference timing, wherein the set of resources spans two or more frequency subbands of the plurality of frequency subbands; as well as The control channel transmission is received via the set of resources.

2. The method of claim 1, wherein the monitoring comprises: monitoring two or more frequency sub-bands of the plurality of frequency sub-bands for respective instances of the SSB; Two or more instances of the SSB from two or more monitored frequency sub-bands of the plurality of frequency sub-bands are combined.

3. The method of claim 1, further comprising: A fixed time periodicity is identified for monitoring the one or more frequency subbands of the plurality of frequency subbands for the SSB from the base station.

4. The method of claim 1, further comprising: An SSB time window is identified for monitoring the one or more frequency subbands of the plurality of frequency subbands for the SSB from the base station.

5. A method as claimed in claim 4, wherein the SSB is transmitted using an SSB beam sweeping procedure, wherein a series of consecutive transmit beams within each frequency subband each carries a corresponding SSB, and wherein the same initial transmit beam in the series of consecutive transmit beams is used regardless of when the SSB beam sweeping procedure starts within the SSB time window.

6. The method of claim 4, wherein the SSB is transmitted using an SSB beam sweeping procedure, wherein a series of consecutive transmit beams each carry a corresponding SSB with an SSB index indicating a position of the SSB relative to a frame boundary within each of the plurality of frequency subbands.

7. The method of claim 1, wherein each instance of the SSB transmitted via each of the plurality of frequency subbands indicates a same control resource set (CORESET) set of resources used for the control channel transmission from the base station, and wherein the control channel transmission is a remaining minimum system information (RMSI) physical downlink control channel (PDCCH) transmission.

8. The method of claim 1, wherein the SSB payload of each instance of the SSB indicates the reference timing of the base station relative to the corresponding instance of the SSB.

9. The method of claim 1, wherein each frequency sub-band of the plurality of frequency sub-bands has a corresponding offset from the reference timing of the base station.

10. The method of claim 1, further comprising: A frequency offset of the set of resources relative to the first frequency subband is determined based at least in part on information provided by the first instance of the SSB.

11. The method of claim 1, wherein the set of resources comprises a predetermined start time resource for the control channel transmission relative to the reference frequency subband among the plurality of frequency subbands.

12. The method of claim 1, wherein the set of resources comprises a control channel time window during which the UE is to monitor the control channel transmission.

13. The method of claim 12, wherein the duration of the control channel time window is based at least in part on a listen-before-talk (LBT) procedure duration and a number of LBT attempts that the base station is configured to perform before discarding the control channel transmission.

14. A method for wireless communication at a base station, comprising: identifying a plurality of frequency subbands for transmitting a plurality of synchronization signal blocks (SSBs) via a plurality of transmit beams in a synchronization signal block (SSB) beam sweeping procedure; identifying a set of resources for transmitting a plurality of remaining minimum system information (RMSI) control channel transmissions via the plurality of transmit beams in a RMSI beam sweeping procedure, wherein the set of resources spans two or more frequency subbands of the plurality of frequency subbands; transmitting the plurality of SSBs via the plurality of transmit beams in each of the plurality of subbands in the SSB beam sweeping procedure, wherein the SSB beam sweeping procedure is performed separately during non-overlapping time periods for each of the plurality of frequency subbands, and wherein each of the plurality of SSBs indicates a reference timing of the base station, the reference timing being used to identify the set of resources; performing a listen-before-talk (LBT) procedure to initiate the plurality of RMSI control channel transmissions; as well as Responsive to completing the LBT procedure, transmitting the plurality of RMSI control channel transmissions via the plurality of transmit beams in the RMSI beam sweeping procedure using the set of resources.

15. An apparatus for wireless communication at a user equipment (UE), comprising: means for monitoring one or more frequency subbands of a plurality of frequency subbands for a synchronization signal block (SSB) from a base station, wherein each frequency subband of the plurality of frequency subbands carries non-overlapping instances of the SSB that do not overlap in frequency or time with other instances of the SSB; means for receiving a first instance of the SSB via at least a first frequency sub-band of the plurality of frequency sub-bands based at least in part on the monitoring; means for determining a reference timing of the base station based at least in part on one or more of information from the first instance of the SSB or a frequency location of the first frequency sub-band relative to a reference frequency sub-band of the plurality of frequency sub-bands; means for identifying a set of resources for control channel transmission from the base station based at least in part on the reference timing, wherein the set of resources spans two or more frequency subbands of the plurality of frequency subbands; as well as means for receiving the control channel transmission via the set of resources.

16. The apparatus of claim 15, further comprising: means for monitoring two or more frequency sub-bands of the plurality of frequency sub-bands for respective instances of the SSB; Means for combining two or more instances of the SSB from two or more of the plurality of frequency subbands being monitored.

17. The apparatus of claim 15, further comprising: Means for identifying a fixed time periodicity for monitoring the one or more of the plurality of frequency subbands for the SSB from the base station.

18. The apparatus of claim 15, further comprising: Means for identifying an SSB time window for monitoring the one or more of the plurality of frequency subbands for the SSB from the base station.

19. The apparatus of claim 18, wherein the SSB is transmitted using an SSB beam sweeping procedure, wherein a series of consecutive transmit beams within each frequency subband each carry a corresponding SSB, and wherein the same initial transmit beam in the series of consecutive transmit beams is used regardless of when the SSB beam sweeping procedure starts within the SSB time window.

20. The apparatus of claim 18, wherein the SSB is transmitted using an SSB beam sweeping procedure, wherein a series of consecutive transmit beams each carry a corresponding SSB with an SSB index indicating a position of the SSB relative to a frame boundary within each of the plurality of frequency subbands.

21. The apparatus of claim 15, wherein each instance of the SSB transmitted via each of the plurality of frequency subbands indicates a same control resource set (CORESET) set of resources used for the control channel transmission from the base station, and wherein the control channel transmission is a remaining minimum system information (RMSI) physical downlink control channel (PDCCH) transmission.

22. The apparatus of claim 15, wherein the SSB payload of each instance of the SSB indicates the reference timing of the base station relative to the corresponding instance of the SSB.

23. The apparatus of claim 15, wherein each frequency subband of the plurality of frequency subbands has a respective offset from the reference timing of the base station.

24. The apparatus of claim 15, further comprising: Means for determining a frequency offset for the set of resources relative to the first frequency subband based at least in part on information provided by the first instance of the SSB.

25. The apparatus of claim 15, wherein the set of resources comprises a predetermined start time resource for the control channel transmission relative to the reference frequency subband of the plurality of frequency subbands.

26. The apparatus of claim 15, wherein the set of resources comprises a control channel time window during which the UE is to monitor the control channel transmission.

27. The apparatus of claim 26, wherein the duration of the control channel time window is based at least in part on a listen-before-talk (LBT) procedure duration and a number of LBT attempts that the base station is configured to perform before discarding the control channel transmission.

28. A device for wireless communication at a base station, comprising: means for identifying a plurality of frequency subbands for transmitting a plurality of synchronization signal blocks (SSBs) via a plurality of transmit beams in a synchronization signal block (SSB) beam sweeping procedure; means for identifying a set of resources for transmitting a plurality of remaining minimum system information (RMSI) control channel transmissions via the plurality of transmit beams in a RMSI beam sweeping procedure, wherein the set of resources spans two or more frequency subbands of the plurality of frequency subbands; means for transmitting the plurality of SSBs via the plurality of transmit beams in each of the plurality of subbands in the SSB beam sweeping procedure, wherein the SSB beam sweeping procedure is performed separately during non-overlapping time periods for each of the plurality of frequency subbands, and wherein each of the plurality of SSBs indicates a reference timing of the base station, the reference timing being used to identify the set of resources; means for performing a listen-before-talk (LBT) procedure to initiate transmission of the plurality of RMSI control channels; as well as Means for transmitting the plurality of RMSI control channel transmissions via the plurality of transmit beams in the RMSI beam sweeping procedure using the set of resources in response to completing the LBT procedure.

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