Sidelink unlicensed broadband resource pool configuration for communications

Abstract

The described technology relates to improved methods, systems, devices, and apparatus for supporting sidelink synchronization signal block (S-SSB) design with a broadband resource pool for data transmission within a shared spectrum. For example, the described techniques cause a user equipment (UE) to transmit one or more S-SSBs within one or more sub-bands of a time slot, such that remaining bandwidth, including within the same time slot as the S-SSBs, remains available in a resource pool for data communication. The techniques provided in the present disclosure allow for higher utilization of bandwidth in a shared spectrum with a minimum of resource blocks that are omitted in utilization. Thus, such implementations maximize shared spectrum utilization.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of Greek Patent Application No. 20220100665, filed on August 8, 2022, entitled “SIDELINK-UNLICENSED WIDEBANDRESOURCE POOL CONFIGURATION FOR COMMUNICATIONS”, which is expressly incorporated herein by reference in its entirety. Background Art Technical Field

[0003] The present disclosure relates generally to communication systems, and more particularly to implementing sidelink unlicensed broadband resource pool configuration in consideration of a sidelink synchronization signal block (S-SSB) design for shared spectrum.

[0004] introduction

[0005] Wireless communication systems are widely deployed to provide a variety of telecommunication services, such as telephony, video, data, messaging, and broadcast. Typical wireless communication systems may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.

[0006] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate at a city, country, region, or even global level. An example telecommunication standard is 5G New Radio (NR). 5G NR is part of the continued mobile broadband evolution promulgated by the 3rd Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with the Internet of Things (IoT)), and other requirements. 5G NR includes services associated with enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra-reliable low latency communications (URLLC). Certain aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard.

[0007] Some wireless communication systems may support communications between user equipment (UEs), which may be referred to as sidelink communications. However, in some examples, some sidelink signaling sent between UEs may be incompatible with or fail to meet some requirements (e.g., occupied channel bandwidth (OCB) requirements), such as for communications in a shared spectrum.

[0008] Therefore, there is a need for further improvements in 5G NR technology. In addition, these improvements can also be applied to other multiple access technologies and telecommunication standards that adopt these technologies. For example, it is expected to improve the efficiency and latency related to the mobility of UEs communicating with network entities. Summary of the invention

[0009] The following presents a simplified summary of one or more aspects in order to provide a basic understanding of these aspects. This summary is not an extensive overview of all contemplated aspects, and is neither intended to identify key or important elements of all aspects, nor to describe the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to a more detailed description presented later.

[0010] The described techniques relate to improved methods, systems, devices, and apparatuses for supporting sidelink synchronization signal block (S-SSB) designs with a broadband resource pool for data transmission within a shared spectrum. For example, the described techniques enable a user equipment (UE) to transmit one or more S-SSBs within one or more subbands of a time slot such that the remaining bandwidth within the same time slot as the S-SSB remains available in the resource pool for data communication. The techniques provided in the present disclosure allow for higher utilization of bandwidth in a shared spectrum with minimal resource blocks omitted from utilization. Thus, such specific implementations increase shared spectrum utilization.

[0011] An example aspect includes a method for wireless communication by a user equipment, the method comprising configuring resources to support sidelink communication between a first user equipment (UE) and a second UE on a shared spectrum, such that at least a first set of resource blocks (RBs) within a first subband of a first transmission time interval (TTI) is available to be part of a resource pool for sidelink data communication, and a second set of RBs within a second subband of the first TTI is allocated to allow transmission of sidelink synchronization signal blocks (S-SSBs). The method may also include: transmitting from the first UE to the second UE one or more S-SSBs in a second set of RBs within a second subband of the first TTI that are allocated for S-SSB transmission, and a first set of RBs within a first subband of the first TTI is included in a resource pool for use by one or more UEs for data communication on the shared spectrum.

[0012] Another example aspect includes an apparatus for wireless communication by a user equipment, the apparatus comprising a memory including instructions executable by a processor coupled to the memory. The instructions are executable by the processor to configure resources to support sidelink communication between a first UE and a second UE on a shared spectrum, such that at least a first set of RBs within a first subband of a first TTI is available to be part of a resource pool for sidelink data communication, and a second set of RBs within a second subband of the first TTI is allocated to allow transmission of S-SSBs. The processor is also configured to transmit one or more S-SSBs from a second set of RBs within a second subband of the first TTI that are allocated for S-SSB transmission from the first UE to the second UE, and the first set of RBs within the first subband of the first TTI is included in the resource pool for use by one or more UEs for data communication on the shared spectrum.

[0013] Another example includes an apparatus for wireless communication by a user equipment, the apparatus including means for configuring resources to support sidelink communication between a first UE and a second UE on a shared spectrum, such that at least a first set of RBs within a first subband of a first TTI is available to be part of a resource pool for sidelink data communication, and a second set of RBs within a second subband of the first TTI is allocated to allow transmission of S-SSBs. The apparatus also includes means for transmitting from the first UE to the second UE one or more S-SSBs in the second set of RBs within the second subband of the first TTI that are allocated for S-SSB transmission, and the first set of RBs within the first subband of the first TTI is included in the resource pool for use by one or more UEs for data communication on the shared spectrum.

[0014] Another example includes a non-transitory computer-readable medium storing instructions executable by a processor for wireless communication. The instructions executable by the processor include instructions for: configuring resources to support sidelink communication between a UE and a second UE on a shared spectrum, so that at least a set of RBs within a first subband of a TTI can be used to become part of a resource pool for sidelink data communication, and a second set of RBs within a second subband of the first TTI is allocated to allow transmission of S-SSBs. The processor also includes a component for: transmitting one or more S-SSBs in a second set of RBs within a second subband of a first TTI that are allocated for S-SSB transmission from a first UE to a second UE, and a first set of RBs within a first subband of a first TTI is included in a resource pool for use by one or more UEs for data communication on a shared spectrum.

[0015] To achieve the foregoing and related ends, one or more aspects include the features fully described below and particularly pointed out in the claims. The following description and the accompanying drawings set forth in detail some illustrative features of one or more aspects. However, these features are merely indicative of some of the various ways in which the principles of the various aspects may be employed, and this specification is intended to include all such aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1A is a diagram illustrating an example of a wireless communication system and an access network according to various aspects of the present disclosure.

[0017] Figure 1B is a diagram illustrating an example of a decomposed base station architecture according to various aspects of the present disclosure.

[0018] Figure 2A is a diagram illustrating an example of a first frame according to various aspects of the present disclosure.

[0019] Figure 2B is a diagram illustrating an example of downlink (DL) channels within a subframe according to various aspects of the present disclosure.

[0020] Figure 2C is a diagram illustrating an example of a second frame according to various aspects of the present disclosure.

[0021] Figure 2D is a diagram illustrating an example of uplink (UL) channels within a subframe according to various aspects of the present disclosure.

[0022] Figure 3 is a diagram illustrating frame structures, resources, and channels that support use of an S-SSB waveform in a configuration with a broadband resource pool in order to reduce and / or minimize S-SSB slot avoidance and increase and / or maximize resource pool utilization.

[0023] Figure 4A This is the first example of a frame structure, resources, and channels that support use of an S-SSB waveform in a configuration with a broadband resource pool.

[0024] Figure 4B is a second example of a frame structure, resources, and channels that support use of an S-SSB waveform in a configuration with a broadband resource pool.

[0025] Figure 4C is a third example of a frame structure, resources, and channels that support use of an S-SSB waveform in a configuration with a broadband resource pool.

[0026] Figure 4D This is a fourth example of a frame structure, resources, and channels that support use of an S-SSB waveform in a configuration with a broadband resource pool.

[0027] Figure 5 is a schematic diagram of an example implementation of various components of user equipment according to various aspects of the present disclosure.

[0028] Figure 6 is a flow chart of an example of a method of wireless communication implemented by a UE according to various aspects of the present disclosure. DETAILED DESCRIPTION

[0029] The specific embodiments described below in conjunction with the accompanying drawings are intended as descriptions of various configurations and are not intended to represent the only configurations in which the concepts described herein can be practiced. In order to provide a thorough understanding of the various concepts, the specific embodiments include specific details. However, it is apparent to those skilled in the art that these concepts can be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form to avoid obscuring these concepts.

[0030] Some wireless communication systems may support sidelink communications between user equipment (UE). In some cases, a UE may communicate using one or more frequency bands associated with a shared radio frequency spectrum, which may be referred to as an unlicensed radio frequency spectrum band. A shared spectrum may include a radio frequency band that may not be reserved, allocated, or licensed for a specific use case or a specific radio access technology (RAT). In such a system, a UE may perform a listen-before-talk (LBT) procedure to obtain access to a sidelink bandwidth part (BWP) for sidelink transmissions. In some cases, a UE may use signaling that satisfies an occupied channel bandwidth (OCB) threshold associated with shared spectrum transmissions. In some cases, an OCB threshold for shared spectrum communications may be specified in a wireless communication standard. The OCB threshold may include a threshold percentage of a channel that will be occupied or used for wireless communication (e.g., 80% of a 20 megahertz (MHz) channel).

[0031] In some cases, a UE may obtain access to a sidelink BWP for transmitting a sidelink synchronization signal block (S-SSB). S-SSB may allow other UEs to discover the UE and establish a sidelink connection with the UE for subsequent sidelink communications. In some examples, a discovery reference signal (DRS) window may include multiple S-SSB candidate positions to increase the chances of the UE transmitting S-SSB. However, increasing the SSB opportunity may adversely affect the overall resource pool for data communications on a shared spectrum. Traditional resource pools typically exclude data from being transmitted in the same time slot as an S-SSB signal. Such general exclusion of S-SSB time slots from a resource pool may affect bandwidth utilization and transmission reliability. For example, if a data channel occupancy time (COT) transmission (e.g., for continuous transmission) falls on an S-SSB opportunity, but the UE does not transmit an S-SSB during the S-SSB opportunity, the COT is terminated prematurely. Therefore, in the presence of multiple S-SSB candidate time slots or positions, the overhead of the S-SSB may be significant and adversely affect the throughput for communication (particularly for eMBB services).

[0032] In some aspects, it may be beneficial to include S-SSB transmissions in a data resource pool, where PSCCH and / or PSSCH transmission rate matching may be performed around the S-SSB in the same time slot. For example, the UE may use a waveform of the S-SSB so as to transmit the S-SSB using time-frequency resources that enable the UE to multiplex the S-SSB with PSSCH signaling in the frequency domain. As an example, the UE may transmit one or more S-SSBs using four symbols of a time slot (e.g., a 14-symbol time slot), and may transmit one or more S-SSBs using four symbols different from the first four symbols of the time slot (e.g., to avoid allocating time-frequency resources for PSCCH signaling). In some cases, the UE may transmit sidelink control information (SCI) that may indicate which subband is carrying the S-SSB. The SCI may indicate one or more subbands via a bitmap, a subband index field, a single bit, or any combination thereof. The UE may select time-frequency resources for one or more S-SSBs to avoid time-frequency resources for PSCCH signaling, demodulation reference signal (DMRS) signaling, SCI signaling, and automatic gain control (AGC) signaling. Additionally or alternatively, the UE may perform one or more operations to maintain phase continuity and limit transmit power variations. For example, the one or more operations may include any combination of using an interleaved waveform design to send PSCCH and PSSCH signaling, adjusting the transmit power of PSSCH signaling, performing rate matching around S-SSB symbols, and sending shortened PSSCH signaling.

[0033] However, multiplexing PSCCH and / or PSSCH and S-SSB in the same timeslot has its own disadvantages. For example, not all UEs or service providers may be adapted to multiplex PSCCH and / or PSSCH and S-SSB in the same timeslot. Additionally, having subchannel rate matching around the S-SSB RE means that the size and resource mapping of the subchannels in the S-SSB timeslot are not equal. Therefore, resource selection and reservation may be more complicated. In some use cases, such as vehicle-to-everything (V2X), where coverage is a concern, S-SSB SFN transmissions and / or power boosting may also be required. Therefore, multiplexing PSCCH and / or PSSCH with S-SSB signals may not be a practical solution in many scenarios.

[0034] According to the techniques described herein, a UE may send one or more S-SSBs within one or more subbands of a time slot such that the remaining bandwidth within the same time slot as the S-SSB remains available for data communication in the resource pool. In some examples, the sidelink unlicensed band may be configured with wideband operation (e.g., 100 MHz). Thus, the UE may avoid excluding all RB sets in the S-SSB time slot from the resource pool. The techniques provided in the present disclosure allow for higher utilization of bandwidth in a shared spectrum with minimal resource blocks omitted from utilization. Therefore, such specific implementations increase and / or maximize shared spectrum utilization.

[0035] Several aspects of telecommunication systems will now be presented with reference to various apparatus and methods. These apparatus and methods will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether these elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0036] As an example, an element or any part of an element or any combination of elements can be implemented as a "processing system" including one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, systems on chip (SoCs), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gate logic, discrete hardware circuits, and other suitable hardware configured to perform various functionalities described throughout the present disclosure. One or more processors in a processing system can execute software. Whether referred to as software, firmware, middleware, microcode, hardware description language, or other names, software should be broadly interpreted as meaning instructions, instruction sets, codes, code segments, program codes, programs, subroutines, software components, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc.

[0037] Therefore, in one or more example embodiments, the described functions can be implemented with hardware, software or any combination thereof. If implemented with software, the functions can be stored or encoded on a computer-readable medium as one or more instructions or codes. Computer-readable media include computer storage media. Storage media can be any available medium that can be accessed by a computer. By way of example and not limitation, such computer-readable media can include a random access memory (RAM), a read-only memory (ROM), an electrically erasable programmable ROM (EEPROM), an optical disk storage device, a magnetic disk storage device, other magnetic storage devices, a combination of computer-readable media of the above type, or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.

[0038] Figure 1A is a diagram illustrating an example of a wireless communication system 100 (also referred to as a wireless wide area network (WWAN)) that includes a base station 102 (also referred to herein as a network entity), a user equipment (UE) 104, an evolved packet core (EPC) 160, and another core network 190 (e.g., a 5G core (5GC)).

[0039] One or more of the UEs 104 may include a communication management component 198, wherein the communication management component 198 is operable to perform techniques for configuring UE communications within a sidelink unlicensed band for wideband operation such that the UE can transmit one or more S-SSBs within one or more subbands of a time slot without imposing exclusion of all sets of RBs in an S-SSB time slot from a resource pool.

[0040] Base station (or network entity) 102 may include macro cells (high-power cellular base stations) and / or small cells (low-power cellular base stations). Macro cells include base stations. Small cells include femto cells, pico cells, and micro cells. Base station 102 may be configured as a decomposed RAN (D-RAN) or open RAN (O-RAN) architecture, in which functionality is split between multiple units (such as a central unit (CU), one or more distributed units (DUs), or radio units (RUs)). Such an architecture may be configured to utilize a protocol stack that is logically split between one or more units (such as one or more CUs and one or more DUs). In some aspects, a CU may be implemented within an edge RAN node, and in some aspects, one or more DUs may be co-located with a CU, or may be geographically distributed in one or more RAN nodes. A DU may be implemented to communicate with one or more RUs. Any decomposed component in a D-RAN and / or O-RAN architecture may be referred to as a network entity herein.

[0041] The base station 102 configured for 4G Long Term Evolution (LTE) (collectively referred to as Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) can interface with the EPC 160 via a first backhaul link 132 (e.g., an S1 interface). The base station 102 configured for 5G New Radio (NR) (collectively referred to as Next Generation RAN (NG-RAN)) can interface with the core network 190 via a second backhaul link 184. Among other functions, the base station 102 can also perform one or more of the following functions: delivery of user data, radio channel encryption and decryption, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection establishment and release, load balancing, distribution of non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS), subscriber and equipment tracking, RAN information management (RIM), paging, positioning, and delivery of warning messages. The base stations 102 may communicate with each other directly or indirectly (eg, via the EPC 160 or the core network 190) via the third backhaul link 134 (eg, an X2 interface). The first backhaul link 132, the second backhaul link 184, and the third backhaul link 134 may be wired or wireless.

[0042] Base station 102 can communicate wirelessly with UE 104. Each of base stations 102 can provide communication coverage for a corresponding geographic coverage area 110. There may be overlapping geographic coverage areas 110. For example, a small cell 102' may have a coverage area 110' that overlaps with the coverage area 110 of one or more macro base stations 102. A network including both small cells and macro cells can be referred to as a heterogeneous network. A heterogeneous network can also include a home evolved Node B (eNB) (HeNB), which can provide services to a restricted group called a closed subscriber group (CSG). The communication link 120 between base station 102 and UE 104 may include an uplink (UL) (also called a reverse link) transmission from UE 104 to base station 102 and / or a downlink (DL) (also called a forward link) transmission from base station 102 to UE 104. The communication link 120 can use multiple input multiple output (MIMO) antenna technology, including spatial multiplexing, beamforming and / or transmit diversity. The communication link can be through one or more carriers. For each carrier allocated in the carrier aggregation for up to a total of up to Yx MHz (x component carriers) for transmission in each direction, the base station 102 / UE 104 can use a spectrum with a bandwidth of up to Y megahertz (MHz) (e.g., 5 MHz, 10 MHz, 15 MHz, 20 MHz, 100 MHz, 400 MHz, etc.). The carriers may or may not be adjacent to each other. The allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated for DL ​​compared to UL). The component carrier may include a primary component carrier and one or more secondary component carriers. The primary component carrier may be referred to as a primary cell (PCell) and the secondary component carrier may be referred to as a secondary cell (SCell).

[0043] Some UEs 104 may communicate with each other using a device-to-device (D2D) communication link 158. The D2D communication link 158 may use DL / UL WWAN spectrum. The D2D communication link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), and a physical sidelink control channel (PSCCH). D2D communication may be performed by a variety of wireless D2D communication systems, such as, for example, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, LTE, or NR.

[0044] The wireless communication system may also include a Wi-Fi access point (AP) 150 that communicates with a Wi-Fi station (STA) 152 via a communication link 154 in, for example, a 5 gigahertz (GHz) unlicensed spectrum. When communicating in the unlicensed spectrum, the STA 152 / AP 150 may perform a clear channel assessment (CCA) to determine whether a channel is available prior to communication.

[0045] The small cell 102' may operate in licensed and / or unlicensed spectrum. When operating in an unlicensed spectrum, the small cell 102' may employ NR and use the same unlicensed spectrum (e.g., 5 GHz, etc.) as used by the Wi-Fi AP 150. The small cell 102' employing NR in the unlicensed spectrum may improve the coverage of the access network and / or increase the capacity of the access network.

[0046] The electromagnetic spectrum is typically subdivided into various categories, bands, channels, etc. based on frequency / wavelength. In 5G NR, two initial operating bands have been identified as frequency range designations FR1 (410 MHz-7.125 GHz) and FR2 (24.25 GHz-52.6 GHz). Frequencies between FR1 and FR2 are typically referred to as mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, FR1 is typically referred to (interchangeably) as the "sub-6 GHz" band in various documents and articles. A similar naming issue sometimes occurs with respect to FR2, which is typically (interchangeably) referred to as the "millimeter wave" band in documents and articles, despite being different from the extremely high frequency (EHF) band (30 GHz-300 GHz) identified as the "millimeter wave" band by the International Telecommunication Union (ITU).

[0047] In view of the above aspects, unless otherwise specifically stated, it should be understood that if used in this article, the term "below 6 GHz" or the like can broadly represent frequencies that can be less than 6 GHz, can be within FR1, or can include mid-band frequencies. In addition, unless otherwise specifically stated, it should be understood that if the term "millimeter wave" or the like is used in this article, it can broadly represent frequencies that can include mid-band frequencies, can be within FR2, or can be within the EHF band.

[0048] The base station 102, whether a small cell 102' or a large cell (e.g., a macro base station), may include and / or be referred to as an eNB, a gNodeB (gNB), or another type of base station. Some base stations, such as gNB 180, may operate in the traditional sub-6 GHz spectrum, in millimeter wave frequencies, and / or near millimeter wave frequencies to communicate with the UE 104. When the gNB 180 operates in millimeter wave or near millimeter wave frequencies, the gNB 180 may be referred to as a millimeter wave base station. The millimeter wave base station 180 may utilize beamforming 182 with the UE 104 to compensate for path loss and short range. The base station 180 and the UE 104 may each include multiple antennas, such as antenna elements, antenna panels, and / or antenna arrays, to facilitate beamforming.

[0049] The base station 180 may transmit a beamformed signal in one or more transmit directions 182' to the UE 104. The UE 104 may receive the beamformed signal from the base station 180 in one or more receive directions 182". The UE 104 may also transmit a beamformed signal in one or more transmit directions to the base station 180. The base station 180 may receive the beamformed signal in one or more receive directions from the UE 104. The base station 180 / UE 104 may perform beam training to determine the best receive direction and transmit direction for each of the base station 180 / UE 104. The transmit direction and receive direction of the base station 180 may be the same or may be different. The transmit direction and receive direction of the UE 104 may be the same or may be different.

[0050] The EPC 160 may include a mobility management entity (MME) 162, other MMEs 164, a serving gateway 166, an MBMS gateway 168, a broadcast multicast service center (BM-SC) 170, and a packet data network (PDN) gateway 172. The MME 162 may communicate with a home subscriber server (HSS) 174. The MME 162 is a control node that handles signaling between the UE 104 and the EPC 160. Generally speaking, the MME 162 provides bearer and connection management. All user Internet Protocol (IP) packets are passed through the serving gateway 166, which itself is connected to the PDN gateway 172. The PDN gateway 172 provides UE IP address allocation and other functions. The PDN gateway 172 and the BM-SC 170 are connected to IP services 176. The IP services 176 may include the Internet, an intranet, an IP multimedia subsystem (IMS), a PS streaming service, and / or other IP services. The BM-SC 170 may provide functions for MBMS user service configuration and delivery. BM-SC 170 may serve as an entry point for content provider MBMS delivery, may be used to authorize and initiate MBMS bearer services in a public land mobile network (PLMN), and may be used to schedule MBMS delivery. MBMS gateway 168 may be used to distribute MBMS services to base stations 102 belonging to a multicast broadcast single frequency network (MBSFN) area of ​​a broadcast specific service, and may be responsible for session management (start / stop) and for collecting eMBMS related billing information.

[0051] The core network 190 may include an access and mobility management function (AMF) 192, other AMFs 193, a session management function (SMF) 194, and a user plane function (UPF) 195. The AMF 192 may communicate with a unified data management (UDM) 196. The AMF 192 is a control node that handles signaling between the UE 104 and the core network 190. Typically, the AMF 192 provides quality of service (QoS) flows and session management. All user IP packets are delivered through the UPF 195. The UPF 195 provides UE IP address allocation and other functions. The UPF 195 is connected to an IP service 197. The IP service 197 may include the Internet, an intranet, an IMS, a packet switching (PS) streaming media service, and / or other IP services.

[0052] A base station may include and / or be referred to as a network entity, gNB, Node B, eNB, access point, base transceiver station, radio base station, radio transceiver, transceiver function, basic service set (BSS), extended service set (ESS), transmit receive point (TRP), or some other suitable term. Base station 102 provides an access point to EPC 160 or core network 190 for UE 104. Examples of UE 104 include cellular phones, smart phones, session initiation protocol (SIP) phones, laptops, personal digital assistants (PDAs), satellite radios, global positioning systems, multimedia devices, video devices, digital audio players (e.g., MP3 players), cameras, game consoles, tablet devices, smart devices, wearable devices, vehicles, electric meters, gas pumps, large or small kitchen appliances, healthcare equipment, implants, sensors / actuators, displays, or any other similarly functional device. Some of UE 104 may be referred to as IoT devices (e.g., parking meters, gas pumps, ovens, vehicles, monitors, cameras, industrial / manufacturing equipment, appliances, vehicles, robots, drones, etc.). IoT UEs may include machine type communication (MTC) / enhanced MTC (eMTC, also known as Category (CAT)-M, Cat M1) UEs, NB-IoT (also known as CATNB1) UEs, and other types of UEs. In the present disclosure, eMTC and NB-IoT may refer to future technologies that may evolve from or be based on these technologies. For example, eMTC may include FeMTC (further eMTC), eFeMTC (enhanced further eMTC), mMTC (massive MTC), etc., and NB-IoT may include eNB-IoT (enhanced NB-IoT), FeNB-IoT (further enhanced NB-IoT), etc. UE 104 may also be referred to as a station, a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.

[0053] Although the present disclosure may focus on 5G NR, the concepts and aspects described herein may be applicable to other similar areas such as LTE, Advanced LTE (LTE-A), Code Division Multiple Access (CDMA), Global System for Mobile Communications (GSM), and / or other wireless / radio access technologies.

[0054] Figure 1B1 is a diagram illustrating an example of a decomposed base station 101 architecture, any component or element of which may be referred to herein as a network entity. The decomposed base station 101 architecture may include one or more central units (CUs) 103, which may communicate directly with a core network 105 via a backhaul link, or indirectly with the core network 105 through one or more decomposed base station units (such as a near real-time (near RT) RAN intelligent controller (RIC) 107 via an E2 link, or a non-real-time (non-RT) RIC 109 associated with a service management and orchestration (SMO) framework 111, or both). The CU 103 may communicate with one or more distributed units (DUs) 113 via corresponding midhaul links (such as an F1 interface). The DU 113 may communicate with one or more radio units (RUs) 115 via corresponding fronthaul links. The RU 115 may communicate with corresponding UEs 104 via one or more radio frequency (RF) access links. In some implementations, a UE 104 may be served simultaneously by multiple RUs 115.

[0055] Each of the units (e.g., CU 103, DU 113, RU 115, and near-RT RIC 107, non-RT RIC 109, and SMO framework 111) may include or be coupled to one or more interfaces configured to receive or send signals, data, or information (collectively referred to as signals) via a wired or wireless transmission medium. Each of the units or an associated processor or controller that provides instructions to the communication interface of these units may be configured to communicate with one or more of the other units via a transmission medium. For example, the unit may include a wired interface configured to receive or send signals to one or more of the other units on a wired transmission medium. Additionally, these units may include a wireless interface that may include a receiver, a transmitter, or a transceiver (such as a radio frequency (RF) transceiver) configured to receive or send signals, or both, to one or more of the other units on a wireless transmission medium.

[0056] In some aspects, CU 103 may host one or more higher layer control functions. Such control functions may include radio resource control (RRC), packet data convergence protocol (PDCP), service data adaptation protocol (SDAP), etc. Each control function may be implemented using an interface configured to communicate signals with other control functions hosted by CU 103. CU 103 may be configured to handle user plane functionality (i.e., central unit-user plane (CU-UP)), control plane functionality (i.e., central unit-control plane (CU-CP)), or a combination thereof. In some specific implementations, CU 103 may be logically split into one or more CU-UP units and one or more CU-CP units. When implemented in an O-RAN configuration, the CU-UP unit may communicate bidirectionally with the CU-CP unit via an interface (such as an E1 interface). As needed, CU 103 may be implemented to communicate with DU 113 for network control and signaling.

[0057] DU 113 may correspond to a logical unit that includes one or more base station functions for controlling the operation of one or more RU 115. In some aspects, DU 113 may host one or more of a radio link control (RLC) layer, a medium access control (MAC) layer, and one or more high physical (PHY) layers (such as modules for forward error correction (FEC) encoding and decoding, scrambling, modulation and demodulation, etc.) depending at least in part on functional splits such as those defined by the Third Generation Partnership Project (3GPP). In some aspects, DU 113 may also host one or more low PHY layers. Each layer (or module) may be implemented using an interface that is configured to communicate signals with other layers (and modules) hosted by DU 113 or with control functions hosted by CU 103.

[0058] The lower layer functionality may be implemented by one or more RUs 115. In some deployments, the RU 115 controlled by the DU 113 may correspond to a logical node that hosts RF processing functions or low PHY layer functions (such as performing fast Fourier transform (FFT), inverse FFT (iFFT), digital beamforming, physical random access channel (PRACH) extraction and filtering, etc.), or both, based at least in part on functional splitting (such as lower layer functional splitting). In such an architecture, the RU 115 may be implemented to handle over-the-air (OTA) communications with one or more UEs 104. In some specific implementations, real-time and non-real-time aspects of control plane and user plane communications with the RU 115 may be controlled by the corresponding DU 113. In some scenarios, this configuration may enable the implementation of the DU 113 and the CU 103 in a cloud-based RAN architecture (such as a vRAN architecture).

[0059] The SMO framework 111 may be configured to support RAN deployment and provisioning of non-virtualized network elements and virtualized network elements. For non-virtualized network elements, the SMO framework 111 may be configured to support the deployment of dedicated physical resources for RAN coverage requirements, which may be managed via an operation and maintenance interface (such as an O1 interface). For virtualized network elements, the SMO framework 111 may be configured to interact with a cloud computing platform (such as an open cloud (O-Cloud) 290) to perform network element lifecycle management (such as to instantiate virtualized network elements) via a cloud computing platform interface (such as an O2 interface). Such virtualized network elements may include, but are not limited to, CU 103, DU 113, RU 115, and near-RT RIC 107. In some specific implementations, the SMO framework 111 may communicate with hardware aspects of the 4G RAN (such as an open eNB (O-eNB) 117) via the O1 interface. Additionally, in some specific implementations, the SMO framework 111 may communicate directly with one or more RUs 115 via the O1 interface. The SMO framework 111 may also include a non-RT RIC 109 configured to support the functionality of the SMO framework 111 .

[0060] The non-RT RIC 109 may be configured to include logic functions that enable non-real-time control and optimization of RAN elements and resources, artificial intelligence / machine learning (AI / ML) workflows including model training and updating, or policy-based guidance of applications / features in the near-RT RIC 107. The non-RT RIC 109 may be coupled to or in communication with the near-RT RIC 107 (such as via an A1 interface). The near-RT RIC 107 may be configured to include logic functions that enable near-real-time control and optimization of RAN elements and resources via data collection and actions through an interface (such as via an E2 interface) that connects one or more CUs 103, one or more DUs 113, or both, and the O-eNB with the near-RT RIC 107.

[0061] In some implementations, in order to generate an AI / ML model to be deployed in the near-RT RIC 107, the non-RT RIC 109 may receive parameters or external enrichment information from an external server. Such information may be utilized by the near-RT RIC 107 and may be received from a non-network data source or from a network function at the SMO framework 111 or the non-RT RIC 109. In some examples, the non-RT RIC 109 or the near-RT RIC 107 may be configured to tune RAN behavior or performance. For example, the non-RT RIC 109 may monitor long-term trends and patterns of performance and employ AI / ML models to perform corrective actions through the SMO framework 111 (such as via reconfiguration of O1) or via the creation of RAN management policies (such as A1 policies).

[0062] FIG. 2A to FIG. 2D is a diagram of various frame structures, resources, and channels used by UE 104 and base station 102 / 180 for communications. Figure 2A FIG200 is a diagram illustrating an example of a first subframe within a 5G NR frame structure. Figure 2B is a diagram 230 illustrating an example of DL channels within a 5G NR subframe. Figure 2C FIG250 is a diagram illustrating an example of a second subframe within a 5G NR frame structure. Figure 2D FIG280 is a diagram illustrating an example of an UL channel within a 5G NR subframe. The 5G NR frame structure may be frequency division duplex (FDD) (wherein for a particular set of subcarriers (carrier system bandwidth), a subframe within the subcarrier set is dedicated to either DL or UL), or may be time division duplex (TDD) (wherein for a particular set of subcarriers (carrier system bandwidth), a subframe within the subcarrier set is dedicated to both DL and UL). Figure 2A , Figure 2C In the example provided, the 5G NR frame structure is assumed to be TDD, where subframe 4 is configured with slot format 28 (most of which are DL), where D is DL, U is UL, and F is flexible between DL / UL, and subframe 3 is configured with slot format 34 (most of which are UL). Although subframes 3 and 4 are shown as having slot formats 34 and 28, respectively, any particular subframe can be configured with any of the various available slot formats 0-61. Slot formats 0 and 1 are DL and UL, respectively. Other slot formats 2-61 include a mix of DL, UL and flexible symbols. The slot format is configured for the UE via a received slot format indicator (SFI) (dynamically configured via DL control information (DCI) or semi-statically / statically configured via radio resource control (RRC) signaling). Note that the following description also applies to the 5G NR frame structure as TDD.

[0063] Other wireless communication technologies may have different frame structures and / or different channels. For example, a 10 millisecond (ms) frame may be divided into 10 equally sized subframes (1 ms). Each subframe may include one or more time slots. A subframe may also include a microslot, which may include 7, 4, or 2 symbols. Each time slot may include 7 or 14 symbols, depending on the time slot configuration. For time slot configuration 0, each time slot may include 14 symbols, and for time slot configuration 1, each time slot may include 7 symbols. The symbol on the DL may be a cyclic prefix (CP) orthogonal frequency division multiplexing (OFDM) (CP-OFDM) symbol. The symbol on the UL may be a CP-OFDM symbol (for high throughput scenarios) or a discrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) symbol (also known as a single carrier frequency division multiple access (SC-FDMA) symbol) (for power-constrained scenarios; limited to single-stream transmission). The number of time slots in a subframe is based on the time slot configuration and parameter set. For slot configuration 0, different parameter sets μ0 to 4 allow 1, 2, 4, 8, and 16 slots per subframe, respectively. For slot configuration 1, different parameter sets 0 to 2 allow 2, 4, and 8 slots per subframe, respectively. Accordingly, for slot configuration 0 and parameter set μ, there are 14 symbols per slot and 2 per subframe. μ time slots. The subcarrier spacing and symbol length / duration are functions of the parameter set. The subcarrier spacing can be equal to 2 μ *15 kilohertz (kHz), where μ is parameter set 0 to 4. Therefore, the subcarrier spacing for parameter set μ=0 is 15 kHz, and the subcarrier spacing for parameter set μ=4 is 240 kHz. The symbol length / duration is inversely related to the subcarrier spacing. FIG. 2A to FIG. 2D An example is provided for slot configuration 0 with 14 symbols per slot and parameter set μ=2 with 4 slots per subframe. The slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is approximately 16.67 μs. Within a frame set, there may be one or more different bandwidth parts (BWPs) that are frequency-division multiplexed (see Figure 2B ). Each BWP can have a specific set of parameters.

[0064] A resource grid may be used to represent a frame structure. Each slot includes a resource block (RB) (also referred to as a physical RB (PRB)) extending over 12 consecutive subcarriers. The resource grid is divided into a plurality of resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0065] like Figure 2A As illustrated, some of the REs carry reference (pilot) signals (RS) for the UE. The RS may include a demodulation RS (DM-RS) for channel estimation at the UE (indicated as R for a particular configuration).x , where 100x is the port number, but other DM-RS configurations are possible) and a channel state information reference signal (CSI-RS). RS may also include a beam measurement RS (BRS), a beam refinement RS (BRRS), and a phase tracking RS (PT-RS).

[0066] Figure 2B Examples of various DL channels within a subframe of a frame are illustrated. The physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs), each CCE including nine RE groups (REGs), and each REG includes four consecutive REs in an OFDM symbol. The PDCCH within a BWP may be referred to as a control resource set (CORESET). Additional BWPs may be located at higher and / or lower frequencies on the channel bandwidth. The primary synchronization signal (PSS) may be within symbol 2 of a specific subframe of a frame. The PSS is used by UE 104 to determine subframe / symbol timing and physical layer identity. The secondary synchronization signal (SSS) may be within symbol 4 of a specific subframe of a frame. The SSS is used by the UE to determine the physical layer cell identification group number and radio frame timing. Based on the physical layer identification and the physical layer cell identification group number, the UE may determine the physical cell identifier (PCI). Based on the PCI, the UE may determine the position of the aforementioned DM-RS. The physical broadcast channel (PBCH) carrying the master information block (MIB) can be logically grouped with the PSS and SSS to form a synchronization signal (SS) / PBCH block (also referred to as an SS block (SSB)). The MIB provides the system frame number (SFN) and the number of RBs in the system bandwidth. The physical downlink shared channel (PDSCH) carries user data, broadcast system information not sent over the PBCH (such as the system information block (SIB)), and paging messages.

[0067] like Figure 2C As illustrated in , some of the REs carry DM-RSs for channel estimation at the base station (indicated as R for one specific configuration, but other DM-RS configurations are possible). The UE may send a DM-RS for a physical uplink control channel (PUCCH) and a DM-RS for a physical uplink shared channel (PUSCH). The PUSCH DM-RS may be sent in the first or first two symbols of the PUSCH. Depending on whether a short PUCCH or a long PUCCH is sent and depending on the specific PUCCH format used, the PUCCH DM-RS may be sent in different configurations. The UE may send a sounding reference signal (SRS). The SRS may be sent in the last symbol of a subframe. The SRS may have a comb structure, and the UE may send the SRS on one of the teeth of the comb. The SRS may be used by the base station for channel quality estimation to achieve frequency-dependent scheduling of the UL.

[0068] Figure 2D Examples of various UL channels within a subframe of a frame are illustrated. The PUCCH may be located at a position as indicated in one configuration. The PUCCH carries uplink control information (UCI), such as scheduling requests, channel quality indicators (CQI), precoding matrix indicators (PMI), rank indicators (RI), and hybrid automatic repeat request (HARQ) acknowledgement (ACK) / negative acknowledgement (NACK) feedback. The PUSCH carries data and may additionally be used to carry buffer status reports (BSRs), power headroom reports (PHRs), and / or UCI.

[0069] Figure 3 A diagram of a frame structure, resources, and channels that support the use of an S-SSB waveform in a configuration with a broadband resource pool (e.g., 100 MHz) to reduce and / or minimize S-SSB slot avoidance and increase and / or maximize resource pool utilization is illustrated. As described above, the wireless communication system may be an example of a 5GNR system, and may support wireless devices to establish an access link (e.g., a Uu interface) and / or a side link (e.g., a PC5 interface). For example, a UE 104 may establish an access link with a network entity 102 / 108 and a side link (e.g., a side link communication link) with another UE 104. In some cases, a UE 104 may establish an access link with a network entity 102 / 108, and may establish a side link with another UE 104 operating as a relay (e.g., an access link with a network entity 102 / 108 that is the same or different from the UE 104), so that the UE 104 may communicate with the network via an access link or a side link or both. In some cases, the device may use a side link to extend the coverage area. For example, a UE 104 may establish a side link with another UE 104 (e.g., a relay UE) that has an access link with a network entity 102 / 108 that is outside of the coverage of the UE 104. Side link communication may be referred to as vehicle-to-vehicle (V2V) communication, V2X communication, device-to-device (D2D) communication, or other terminology.

[0070] The wireless communication system may also support sidelink communications in shared radio frequency spectrum bands (e.g., unlicensed radio frequency spectrum bands) that may not be reserved, allocated, or licensed for a particular use case or a particular RAT. The UE 104 may perform one or more channel access procedures to obtain access to one or more unlicensed bands. For example, the UE 104 may communicate using time-frequency resources after obtaining access to a channel using one or more channel access techniques (e.g., LBT) to reserve resources for sending signals. After obtaining access to the shared spectrum, the UE 104 may send signaling using multiple symbol periods (e.g., OFDM symbol periods) within a time slot, which may be an example of a TTI (e.g., a time slot).

[0071] In some examples, a first UE 104-a may send information to a second UE 104-b via a communication link, which may be an example of a side link (e.g., a D2D communication link). The first UE 104-a may (e.g., periodically) send one or more S-SSBs 305, which may facilitate synchronization of communications between multiple UEs 104. Conversely, UE 115-b may receive one or more S-SSBs 305 and perform one or more operations to synchronize time-frequency resources with UE 115-a. In some cases, the S-SSB 305 may include a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). UE 104 may send one or more S-SSBs 305 using multicast, groupcast, or broadcast signaling.

[0072] In some examples, UE 104 may use some techniques for transmitting S-SSB such that the S-SSB occupies a full time slot (e.g., time slot 0). In other instances, UE 104 may not be able to multiplex S-SSB with other transmissions because the S-SSB structure (e.g., waveform) may not match the resource pool structure associated with other transmission types (e.g., resource pool structure for PSCCH and PSSCH transmissions). In addition, S-SSB may be incompatible with one or more resource configurations (e.g., subchannel-based resource pool configuration).

[0073] Thus, in such instances, the S-SSB 305 may occupy a portion of a time slot (e.g., the first time slot 315-a). In conventional systems, the UE would be forced to omit transmissions on the time slots (e.g., the first time slot 315-a) that include the S-SSB 305, and thus potentially waste bandwidth resources. The negative impact of S-SSB time slot avoidance is further exacerbated because the DRS window may include multiple S-SSB candidate locations to increase the chances that the UE transmits the S-SSB 305.

[0074] According to the techniques described herein, the UE may transmit one or more S-SSBs 305 in an S-SSB candidate slot 320 within one or more subbands (e.g., a first subband 325 associated with RB set 0, a second subband 330 associated with RB set 1, and / or a third subband 335 associated with RB set 2) such that the remaining bandwidth within the same slot as the S-SSB remains available for data communication in the resource pool. In some examples, the sidelink unlicensed band may be configured with wideband operation (e.g., 100 MHz). Thus, the UE may avoid excluding all RB sets in the S-SSB slot from the resource pool.

[0075] Thus, in the illustrated example, the first S-SSB candidate slot 320 and the second S-SSB candidate slot 320 may be allocated to the second subband 330 (e.g., RB set 1) in the first slot 315-a (slot 0) or the second slot 315-b (slot 1). The broadband resource pool 310 may be configured to select from non-S-SSBs in occupied RB sets (e.g., RB set 0 and RB set 2 in the first slot 315-a and the second slot 315-b, and RB set 0, RB set 1, RB set 2 for the third slot 315-c). In such instances, the resource pool 310 may avoid using a particular subband or subbands for the S-SSB candidate RB set while allowing the resource pool configuration to select from the remaining available RB sets for data communication. Such implementations reduce the S-SSB overhead associated with resource management compared to conventional systems because fewer subbands are omitted from the resource pool.

[0076] In some cases, the UE may send sidelink control information (SCI) that may indicate which subband is carrying the S-SSB. The SCI may indicate one or more subbands via a bitmap, a subband index field, a single bit, or any combination thereof. SCI reservation signaling may allow full flexibility in subchannel (in terms of RB sets and interlace) reservation.

[0077] Since the time slots (e.g., 315-a and / or 315-b) that may include S-SSB signals in one or more S-SSB candidate time slots 320 are included in the resource pool, one or more additional UEs 104 (e.g., SL-U nodes) may signal subchannel reservation on the S-SSB candidate RB set (e.g., RB set 1 in the second subband 330). In such an instance, if the SCI reservation refers to the S-SSB candidate RB set in the S-SSB time slot, the sending UE may ignore the resource reservation request. The resource selection may select only resources within the resource pool 310, so that any reservation for resources outside the resource pool 310 may be considered invalid. In such an instance, if the UE sends an S-SSB 305, the UE may send the S-SSB without considering a reservation request from another UE for resources that conflict with the SSB candidate RB set.

[0078] Figure 4A 4E is an additional diagram of a frame structure, resources, and channels that support use of an S-SSB waveform in a configuration with a broadband resource pool to reduce and / or minimize S-SSB slot avoidance and increase and / or maximize resource pool utilization. In some instances, the resource bandwidth may include both legacy S-SSB candidate slots 402 and new S-SSB candidate slots 404 (e.g., additional slots for more LBT opportunities) for transmission of S-SSBs in the broadband resource pool. In such instances, the wireless communication system and the UE may be configured such that one or both of the slots (first slot 406-a, second slot 406-b) associated with the legacy S-SSB candidate slots 402 and / or the new S-SSB candidate slots 404 may be excluded from the broadband resource pool.

[0079] For example, Figure 4AAs illustrated in , the wireless communication system and the UE may be configured with both the legacy S-SSB candidate slots 402 (e.g., the first S-SSB candidate slot) and the new S-SSB candidate slots 404 (e.g., the second S-SSB candidate slot) to be transmitted in the second subband (e.g., RB set 1) corresponding to the first slot 406-a and the second slot 406-b. In some instances (e.g., for backward compatibility), the UE may be configured to exclude the entire RB set (e.g., the first RB set 425, the second RB set 430, and the third RB set 435) corresponding to each subband within the first slot 406-a that includes the legacy S-SSB candidate slots 402 (e.g., the first S-SSB candidate slot). However, with respect to the new S-SSB candidate slot 404, the RB sets corresponding to the first subband and the third subband 435 subband within the second slot 406-b (e.g., the first RB set 425 and the third RB set 435) may still be included in the resource pool 410. Thus, while providing backward compatibility and flexibility for expansion, such a specific implementation will still minimize the omission of valuable resources for data communications. And because the legacy S-SSB candidate slot 404 may occur within a frequency (e.g., once or twice every 160 ms for 15 and 30 kHz SCS), excluding a limited number of resources in such instances may reduce or limit the adverse impact on S-SSB overhead.

[0080] However, in cases such as Figure 4B In other examples shown, RB sets within the first time slot 406-a and the second time slot 406-b (e.g., the first RB set 425 and the third RB set 435 corresponding to the first subband and the third subband) may also be excluded from the resource pool for both the legacy S-SSB candidate time slot 402 (e.g., the first S-SSB candidate time slot) and the new S-SSB candidate time slot 404 (e.g., the second S-SSB candidate time slot).

[0081] In yet other examples, such as Figure 4CAs illustrated in , the wireless communication system and the UE may be configured for multiple legacy S-SSB candidate slots 402 (e.g., first S-SSB candidate slots). For example, in the first slot 406-a and the second slot 406-b, the second subband 430 associated with the RB set 1 may be allocated for the legacy S-SSB candidate slot 402 for transmission of the S-SSB. In such an instance, since the legacy S-SSB candidate slot 402 exists in the second subband 430 within the first slot 406-a, at least the first subband 425 and the third subband 430 of the first slot 406-a may be omitted from the resource pool. However, although the legacy S-SSB candidate slot 402 exists in the second subband 430 of the second slot 406-b, the first subband 425 and the third subband 430 may be included in the resource pool 410 for the second slot 406-b. In other words, the wireless communication system and the UE may be configured to exclude a portion of a set of RBs in one time slot while maintaining a set of RBs in a resource pool for a different time slot.

[0082] Similarly, if Figure 4D As illustrated in , the wireless communication system and the UE may be configured for multiple new S-SSB candidate time slots 404 (e.g., second S-SSB candidate time slots). For example, in the first time slot 406-a and the second time slot 406-b, the second subband 430 associated with the RB set 1 may be allocated for the new S-SSB candidate time slot 404 for transmission of the S-SSB. In such an instance, since the new S-SSB candidate time slot 404 exists in the second subband 430 within the first time slot 406-a, at least the first subband 425 and the third subband 430 of the first time slot 406-a may be omitted from the resource pool. However, although the new S-SSB candidate time slot 404 exists in the second subband 430 of the second time slot 406-b, the first subband 425 and the third subband 430 may be included in the resource pool 410 for the second time slot 406-b.

[0083] Figure 5 The hardware components and subcomponents of a device (which may be a UE 104) for implementing one or more methods (eg, method 600) described herein according to various aspects of the present disclosure are illustrated. The UE 104 may be a reference Figure 1A Example of the disclosed UE 104. For example, one example of a specific implementation of the UE 104 may include various components, some of which have been described above, in addition to including components such as: one or more processors 512, memory 516, and transceiver 502 communicating via one or more buses 544, which can operate in conjunction with the communication management component 198 to perform the functions described herein in connection with one or more methods (e.g., 600) including the present disclosure.

[0084] In particular, the communication management component 198 may include a resource configuration component 520 for configuring and selecting a resource pool for data communication to take into account S-SSB transmissions from the UE. According to aspects of the present disclosure, the communication management component 198 may also include an S-SSB transmission component 525 for transmitting an S-SSB within one or more resources.

[0085] The one or more processors 512, modem 514, memory 516, transceiver 502, RF front end 588 and one or more antennas 565 may be configured to support voice and / or data calls (simultaneously or non-simultaneously) in one or more wireless access technologies. In one aspect, the one or more processors 512 may include a modem 514 using one or more modem processors. Various functions associated with the communication management component 198 may be included in the modem 514 and / or processor 512, and in one aspect, may be performed by a single processor, while in other aspects, different functions of these functions may be performed by a combination of two or more different processors. For example, in one aspect, the one or more processors 512 may include a modem processor, or a baseband processor, or a digital signal processor, or a transmit processor, or a receiver processor, or any one or any combination of transceiver processors associated with the transceiver 502. In other aspects, some of the features of the one or more processors 512 and / or modem 514 associated with the communication management component 198 may be performed by the transceiver 502.

[0086] The memory 516 may be configured to store data used herein and / or a local version of the application 575 executed by at least one processor 512 or one or more of the communication management component 198 and / or its subcomponents. The memory 516 may include any type of computer-readable medium usable by a computer or at least one processor 512, such as random access memory (RAM), read-only memory (ROM), tape, disk, optical disk, volatile memory, non-volatile memory, and any combination thereof. In one aspect, for example, when the UE 104 is operating at least one processor 512 to execute the communication management component 198 and / or one or more of its subcomponents, the memory 516 may be a non-transitory computer-readable storage medium that stores one or more computer-executable codes defining the communication management component 198 and / or one or more of its subcomponents and / or data associated therewith.

[0087] The transceiver 502 may include at least one receiver 506 and at least one transmitter 508. The receiver 506 may include hardware, firmware, and / or software code executable by a processor for receiving data, the code including instructions and stored in a memory (e.g., a computer-readable medium). The receiver 506 may be, for example, a radio frequency (RF) receiver. In one aspect, the receiver 506 may receive a signal transmitted by at least one UE 104. In addition, the receiver 506 may process such received signals and may also obtain measurements of the signal, such as, but not limited to, Ec / Io, SNR, RSRP, RSSI, etc. The transmitter 508 may include hardware, firmware, and / or software code executable by a processor for transmitting data, the code including instructions and stored in a memory (e.g., a computer-readable medium). Suitable examples of the transmitter 508 may include, but are not limited to, an RF transmitter.

[0088] Moreover, in an aspect, the transmitting device may include an RF front end 588 that may operate in communication with the one or more antennas 565 and the transceiver 502 to receive and transmit radio transmissions, such as wireless communications transmitted by at least one base station 102 or wireless transmissions transmitted by the UE 104. The RF front end 588 may be connected to the one or more antennas 565 and may include one or more low noise amplifiers (LNAs) 590, one or more switches 592, one or more power amplifiers (PAs) 598, and one or more filters 596 for transmitting and receiving RF signals.

[0089] In one aspect, the LNA 590 may amplify the received signal at a desired output level. In one aspect, each LNA 590 may have a specified minimum gain value and a maximum gain value. In one aspect, the RF front end 588 may use one or more switches 592 to select a particular LNA 590 and its specified gain value based on the desired gain value for a particular application.

[0090] In addition, for example, the RF front end 588 can use one or more PAs 598 to amplify the signal for RF output at a desired output power level. In one aspect, each PA 598 can have a specified minimum gain value and a maximum gain value. In one aspect, the RF front end 588 can use one or more switches 592 to select a particular PA 598 and its specified gain value based on the desired gain value for a particular application.

[0091] In addition, for example, the RF front end 458 can use one or more filters 596 to filter the received signal to obtain an input RF signal. Similarly, in one aspect, for example, the output from the corresponding PA 598 can be filtered using a corresponding filter 596 to produce an output signal for transmission. In one aspect, each filter 496 can be connected to a specific LNA 590 and / or PA 598. In one aspect, the RF front end 588 can use one or more switches 592 to select a transmit path or a receive path using a specified filter 596, LNA 590, and / or PA 598 based on the configuration as specified by the transceiver 502 and / or the processor 512.

[0092] Thus, the transceiver 502 can be configured to transmit and receive wireless signals through one or more antennas 565 via the RF front end 588. In one aspect, the transceiver 502 can be tuned to operate at a specified frequency so that the transmitting device can communicate, for example, with one or more base stations 102 or one or more cells associated with one or more base stations 102 or other UEs 104. In one aspect, the modem 514 can configure the transceiver 502 to operate at a specified frequency and power level based on the configuration of the transmitting device and the communication protocol used by the modem 514, for example.

[0093] In one aspect, the modem 514 can be a multi-band multi-mode modem that can process digital signals and communicate with the transceiver 502 so that the transceiver 502 is used to transmit and receive digital data. In one aspect, the modem 514 can be multi-band and can be configured to support multiple frequency bands for a specific communication protocol. In one aspect, the modem 514 can be multi-mode and configured to support multiple operating networks and communication protocols. In one aspect, the modem 514 can control one or more components of the transmitting device (e.g., RF front end 588, transceiver 502) to achieve signal transmission and / or reception with the network based on the specified modem configuration. In one aspect, the modem configuration can be based on the mode of the modem 514 and the frequency band in use. In another aspect, the modem configuration can be based on UE configuration information associated with the transmitting device, such as provided by the network during cell selection and / or cell reselection.

[0094] Reference Figure 6 , an example method 600 for wireless communication according to aspects of the present disclosure may be referred to as Figure 1A The discussed one or more UEs 104 are performed. Although the method 600 is described below with respect to elements of a UE 104, other components may be used to implement one or more of the steps described herein.

[0095] At box 605, method 600 may include configuring resources to support sidelink communications between the first UE and the second UE on a shared spectrum such that at least a first set of RBs within a first subband of a first TTI (e.g., time slot) is available to be part of a resource pool for sidelink data communications, and a second set of RBs within a second subband of the first TTI is allocated to allow transmission of S-SSBs.

[0096] In some aspects, the resource pool may omit a second set of RBs allocated for transmission of an S-SSB within a first TTI. In some examples, configuring resources to support sidelink communications includes a first S-SSB candidate time slot within at least one subband of a first TTI and a second S-SSB candidate time slot within at least one subband of a second TTI. The first S-SSB candidate time slot may be part of an allocation of a default number of S-SSB candidate time slots (e.g., legacy S-SSB candidate time slots), and the second S-SSB candidate time slot (e.g., new S-SSB candidate time slot) may be an additional candidate time slot to support a listen-before-talk (LBT) procedure beyond the default number of S-SSB candidate time slots.

[0097] In some aspects, the first S-SSB candidate time slot and the second S-SSB candidate time slot may be part of a default number of S-SSB candidate time slots allocated. In other instances, the first S-SSB candidate time slot and the second S-SSB candidate time slot may be additional candidate time slots that support the LBT procedure. In some instances, the resource pool may omit all RBs in one of the first TTI corresponding to the first S-SSB candidate time slot or the second TTI corresponding to the second S-SSB candidate time slot. In other instances, the resource pool may omit all RBs in both the first TTI corresponding to the first S-SSB candidate time slot and the second TTI corresponding to the second S-SSB candidate time slot.

[0098] In yet another example, the resource pool may omit at least a portion of the RBs in one of the first TTI corresponding to the first S-SSB candidate time slot or the second TTI corresponding to the second S-SSB candidate time slot. In such a scenario, the first S-SSB candidate time slot and the second S-SSB candidate time slot may both be part of a default number of S-SSB candidate time slot allocations or additional candidate time slots to support the LBT procedure.

[0099] The method may also include sending a sidelink control information (SCI) message indicating which of the one or more subbands includes one or more S-SSBs. The SCI message may include a bitmap indicating which of the one or more subbands includes one or more S-SSBs. The method may also include: receiving an SCI message from a third UE at the first UE, the SCI message indicating that the third UE has selected a second set of RBs within a second subband for the first TTI outside of a resource pool for data communication; and ignoring a resource reservation request from the third UE based on a determination that the resource selection is outside of the resource pool. In some examples, the processor 512, the modem 514, the communication management component 198, the resource configuration component 520, and / or one or more other components or subcomponents in the UE 104 may perform the method of box 605.

[0100] In some embodiments, the processor 512, the modem 514, the communication management component 198, the resource configuration component 520 and / or one or more other components or subcomponents in the UE 104 may be configured as and / or may be defined as a means for configuring resources to support sidelink communications between a first UE and a second UE on a shared spectrum, such that at least a first set of RBs within a first subband of a first TTI is available to become part of a resource pool for sidelink data communications, and a second set of RBs within a second subband of the first TTI is allocated to allow transmission of S-SSBs.

[0101] At block 610, the method 600 may also include: transmitting from the first UE to the second UE one or more S-SSBs in a second RB set allocated for S-SSB transmission within a second subband of the first TTI, while the first RB set within the first subband of the first TTI is included in a resource pool for use by one or more UEs for data communication on a shared spectrum. In some examples, the processor 512, the modem 514, the communication management component 198, the S-SSB transmission component 525, along with one or more other components or subcomponents of the transceiver 502 and / or the UE 104, may perform the method of block 610.

[0102] In some specific implementations, the processor 512, the modem 514, the communication management component 198, the S-SSB transmission component 525, together with the transceiver 502 of the UE 104 and / or one or more other components or subcomponents can be configured as and / or can be defined as a means for: sending one or more S-SSBs in a second RB set allocated for S-SSB transmission within a second subband of a first TTI from a first UE to a second UE, while the first RB set within the first subband of the first TTI is included in a resource pool for use by one or more UEs for data communication on a shared spectrum.

[0103] Some further example clauses

[0104] Specific implementation examples are described in the following numbered clauses:

[0105] 1. A method for wireless communication, the method comprising:

[0106] configuring resources to support sidelink communications between a first user equipment (UE) and a second UE over a shared spectrum such that at least a first set of resource blocks (RBs) within a first subband of a first transmission time interval (TTI) is available to be part of a resource pool for sidelink data communications and a second set of RBs within a second subband of the first TTI is allocated to allow transmission of sidelink synchronization signal blocks (S-SSBs); and

[0107] One or more S-SSBs in the second RB set allocated for S-SSB transmission within the second subband of the first TTI are sent from the first UE to the second UE, and the first RB set within the first subband of the first TTI is included in the resource pool for use by one or more UEs for data communication on the shared spectrum.

[0108] 2. The method of clause 1, wherein the resource pool omits the second set of RBs allocated for transmission of an S-SSB within the first TTI.

[0109] 3. The method according to clauses 1-2, further comprising:

[0110] A sidelink control information (SCI) message is sent indicating which subband of the one or more subbands includes the one or more S-SSBs.

[0111] 4. A method according to clauses 1-3, wherein the sidelink control information message includes a bitmap, which indicates which subband of the one or more subbands includes the one or more S-SSBs.

[0112] 5. A method according to any of the preceding clauses, further comprising:

[0113] receiving, at the first UE, a sidelink control information (SCI) message from a third UE, the sidelink control information (SCI) message indicating that the third UE has selected the second set of RBs within the second subband of the first TTI outside the resource pool for data communication; and

[0114] Based on the determination that the resource selection is outside the resource pool, a resource reservation request from the third UE is ignored.

[0115] 6. A method according to any of clauses 1-5, wherein resources are configured to support sidelink communications including a first S-SSB candidate time slot within at least one subband of a first TTI and a second S-SSB candidate time slot within the at least one subband of a second TTI.

[0116] 7. A method according to any of clauses 1-6, wherein the first S-SSB candidate time slot is part of a default number of S-SSB candidate time slots allocated, and the second S-SSB candidate time slot is an additional candidate time slot that supports a listen-before-talk (LBT) procedure.

[0117] 8. A method according to any of clauses 1-6, wherein the first S-SSB candidate time slot and the second S-SSB candidate time slot are part of a default number of S-SSB candidate time slots allocation.

[0118] 9. A method according to any of clauses 1-6, wherein the first S-SSB candidate time slot and the second S-SSB candidate time slot are additional candidate time slots supporting a listen-before-talk (LBT) procedure.

[0119] 10. A method according to any of clauses 1-6, wherein the resource pool omits all RBs in one of the first TTI corresponding to the first S-SSB candidate slot or the second TTI corresponding to the second S-SSB candidate slot.

[0120] 11. A method according to any of clauses 1-6, wherein the resource pool omits all RBs in both the first TTI corresponding to the first S-SSB candidate slot and the second TTI corresponding to the second S-SSB candidate slot.

[0121] 12. A method according to any of clauses 1-6, wherein the resource pool omits at least a portion of RBs in one of the first TTI corresponding to the first S-SSB candidate time slot or the second TTI corresponding to the second S-SSB candidate time slot.

[0122] 13. A method according to any of clauses 1-6 and 12, wherein the first S-SSB candidate time slot and the second S-SSB candidate time slot are both part of a default number of S-SSB candidate time slot allocations or are additional candidate time slots to support a listen-before-talk (LBT) procedure.

[0123] 14. An apparatus for wireless communication by a first user equipment (UE), the apparatus comprising:

[0124] Memory; and

[0125] a processor coupled to the memory and configured to:

[0126] configuring resources to support sidelink communications between the first UE and a second UE over a shared spectrum such that at least a first set of resource blocks (RBs) within a first subband of a first transmit time interval (TTI) is available to be part of a resource pool for sidelink data communications and a second set of RBs within a second subband of the first TTI is allocated to allow transmission of sidelink synchronization signal blocks (S-SSBs); and

[0127] One or more S-SSBs in the second RB set allocated for S-SSB transmission within the second subband of the first TTI are sent from the first UE to the second UE, and the first RB set within the first subband of the first TTI is included in the resource pool for use by one or more UEs for data communication on the shared spectrum.

[0128] 15. An apparatus for wireless communication as described in clause 14, wherein the resource pool omits the second set of RBs allocated for transmission of S-SSBs within the first TTI.

[0129] 16. An apparatus for wireless communication according to clause 14 or 15, the processor being further configured to:

[0130] A sidelink control information (SCI) message is sent indicating which subband of the one or more subbands includes the one or more S-SSBs.

[0131] 17. An apparatus for wireless communication according to any of the preceding clauses, wherein the sidelink control information message comprises a bitmap indicating which of the one or more subbands comprises the one or more S-SSBs.

[0132] 18. An apparatus for wireless communication according to any preceding clause, the processor being further configured to:

[0133] receiving, at the first UE, a sidelink control information (SCI) message from a third UE, the sidelink control information (SCI) message indicating that the third UE has selected the second set of RBs within the second subband of the first TTI outside the resource pool for data communication; and

[0134] Based on the determination that the resource selection is outside the resource pool, a resource reservation request from the third UE is ignored.

[0135] 19. An apparatus for wireless communication according to any of the preceding clauses, wherein resources are configured to support sidelink communications including a first S-SSB candidate time slot within at least one subband of a first TTI and a second S-SSB candidate time slot within the at least one subband of a second TTI.

[0136] 20. A non-transitory computer readable medium storing instructions executable by a processor for wireless communication, comprising instructions for:

[0137] configuring resources to support sidelink communications between a first user equipment (UE) and a second UE over a shared spectrum such that at least a first set of resource blocks (RBs) within a first subband of a first transmission time interval (TTI) is available to be part of a resource pool for sidelink data communications and a second set of RBs within a second subband of the first TTI is allocated to allow transmission of sidelink synchronization signal blocks (S-SSBs); and

[0138] One or more S-SSBs in the second RB set allocated for S-SSB transmission within the second subband of the first TTI are sent from the first UE to the second UE, and the first RB set within the first subband of the first TTI is included in the resource pool for use by one or more UEs for data communication on the shared spectrum.

[0139] Although the foregoing disclosure discusses illustrative aspects and / or embodiments, it should be noted that various changes and modifications may be made herein without departing from the described aspects and / or embodiments as defined by the appended claims. Furthermore, although elements of the described aspects and / or embodiments are described or claimed in the singular, the plural is also contemplated unless limitation to the singular is explicitly stated. Additionally, all or part of any aspect and / or embodiment may be used with all or part of any other aspect and / or embodiment unless otherwise stated.

[0140] It should be understood that the specific order or hierarchy of the blocks in the disclosed process / flowchart is merely an illustration of the exemplary method. It should be understood that the specific order or hierarchy of the blocks in the process / flowchart can be rearranged based on design preferences. Further, some blocks can be combined or omitted. The attached method claims provide the elements of each block in a sample order, but are not meant to be limited to the specific order or hierarchy provided.

[0141] The foregoing description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects. Therefore, the claims are not intended to be limited to the aspects shown herein, but to conform to the full scope consistent with the language claims, wherein the elements mentioned in the singular are not intended to represent "one and only one", unless specifically so stated, but "one or more". Terms such as "if", "when ..." and "while ..." should be interpreted as "under the conditions of ...", rather than meaning an immediate time relationship or reaction. That is, these phrases, such as "when ...", do not mean an immediate action in response to the occurrence of an action or during the occurrence of an action, but simply imply that if the conditions are met, then the action will occur, but no specific or immediate time limit is required for the occurrence of the action. The word "exemplary" is used herein to mean "used as an example, instance or illustration". Any aspect described as "exemplary" herein is not necessarily interpreted as being preferred or having advantages over other aspects. Unless otherwise specified, the term "some" refers to one or more. Combinations such as “at least one of A, B, or C,” “one or more of A, B, or C,” “at least one of A, B and C,” “one or more of A, B, and C,” and “A, B, C, or any combination thereof” include any combination of A, B, and / or C, and may include multiple A, multiple B, or multiple C. Specifically, combinations such as “at least one of A, B, or C,” “one or more of A, B, or C,” “at least one of A, B, and C,” “one or more of A, B, and C,” and “A, B, C, or any combination thereof” may be only A, only B, only C, A and B, A and C, B and C, or A and B and C, where any such combination may include one or more members of A, B, or C. All structural and functional equivalents to the elements of the various aspects described throughout the disclosure that are known or later become known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Furthermore, no content disclosed herein is intended to be disclosed to the public, regardless of whether such disclosure is explicitly recited in the claims. Words such as "module," "mechanism," "element," "device," etc. may not replace the word "component." Thus, no claim element will be understood to be a functional component unless the element is explicitly recited using the phrase "component for..."

Claims

1. A method for wireless communication, the method comprising: configuring resources to support sidelink communications between a first user equipment (UE) and a second UE over a shared spectrum such that at least a first set of resource blocks (RBs) within a first subband of a first transmit time interval (TTI) is available to be part of a resource pool for sidelink data communications and a second set of RBs within a second subband of the first TTI is allocated to allow transmission of a sidelink synchronization signal block (S-SSB); as well as One or more S-SSBs in the second RB set allocated for S-SSB transmission within the second subband of the first TTI are sent from the first UE to the second UE, and the first RB set within the first subband of the first TTI is included in the resource pool for use by one or more UEs for data communication on the shared spectrum.

2. The method according to claim 1, wherein the resource pool omits the second RB set allocated for transmission of S-SSB within the first TTI.

3. The method according to claim 1, further comprising: A sidelink control information (SCI) message is sent indicating which subband of the one or more subbands includes the one or more S-SSBs.

4. The method of claim 3, wherein the SCI message comprises a bitmap indicating which subband of the one or more subbands comprises the one or more S-SSBs.

5. The method according to claim 1, further comprising: receiving, at the first UE, a sidelink control information (SCI) message from a third UE, the sidelink control information (SCI) message indicating that the third UE has selected the second set of RBs within the second subband of the first TTI outside the resource pool for data communication; as well as Based on the determination that the resource selection is outside the resource pool, a resource reservation request from the third UE is ignored.

6. The method of claim 1, wherein configuring resources to support sidelink communications comprises a first S-SSB candidate time slot within at least one subband of a first TTI and a second S-SSB candidate time slot within the at least one subband of a second TTI.

7. The method of claim 6, wherein the first S-SSB candidate time slot is part of a default number of S-SSB candidate time slots allocated, and the second S-SSB candidate time slot is an additional candidate time slot that supports a listen-before-talk (LBT) procedure.

8. The method of claim 6, wherein the first S-SSB candidate time slot and the second S-SSB candidate time slot are part of a default number of S-SSB candidate time slots allocation.

9. The method of claim 6, wherein the first S-SSB candidate time slot and the second S-SSB candidate time slot are additional candidate time slots supporting a listen-before-talk (LBT) procedure.

10. The method of claim 6, wherein the resource pool omits all RBs in one of the first TTI corresponding to the first S-SSB candidate slot or the second TTI corresponding to the second S-SSB candidate slot.

11. The method of claim 6, wherein the resource pool omits all RBs in both the first TTI corresponding to the first S-SSB candidate slot and the second TTI corresponding to the second S-SSB candidate slot.

12. The method of claim 6, wherein the resource pool omits at least a portion of RBs in one of the first TTI corresponding to the first S-SSB candidate time slot or the second TTI corresponding to the second S-SSB candidate time slot.

13. The method of claim 12, wherein the first S-SSB candidate time slot and the second S-SSB candidate time slot are both part of a default number of S-SSB candidate time slot allocations or are additional candidate time slots to support a listen-before-talk (LBT) procedure.

14. An apparatus for wireless communication by a first user equipment (UE), the apparatus comprising: a memory including instructions; and a processor coupled to the memory to execute the instructions and configured to: configuring resources to support sidelink communications between the first UE and the second UE over a shared spectrum such that at least a first set of resource blocks (RBs) within a first subband of a first transmit time interval (TTI) is available to be part of a resource pool for sidelink data communications and a second set of RBs within a second subband of the first TTI is allocated to allow transmission of sidelink synchronization signal blocks (S-SSBs); as well as One or more S-SSBs in the second RB set allocated for S-SSB transmission within the second subband of the first TTI are sent from the first UE to the second UE, and the first RB set within the first subband of the first TTI is included in the resource pool for use by one or more UEs for data communication on the shared spectrum.

15. The apparatus for wireless communication according to claim 14, wherein the resource pool omits the second RB set allocated for transmission of S-SSB within the first TTI.

16. The apparatus for wireless communication according to claim 14, wherein the processor is further configured to: A sidelink control information (SCI) message is sent indicating which subband of the one or more subbands includes the one or more S-SSBs.

17. The apparatus for wireless communication of claim 16, wherein the SCI message comprises a bitmap indicating which of the one or more subbands comprises the one or more S-SSBs.

18. The apparatus for wireless communication according to claim 14, wherein the processor is further configured to: receiving, at the first UE, a sidelink control information (SCI) message from a third UE, the sidelink control information (SCI) message indicating that the third UE has selected the second set of RBs within the second subband of the first TTI outside the resource pool for data communication; and Based on the determination that the resource selection is outside the resource pool, a resource reservation request from the third UE is ignored.

19. An apparatus for wireless communication according to claim 14, wherein resources are configured to support sidelink communication including a first S-SSB candidate time slot within at least one subband of a first TTI and a second S-SSB candidate time slot within the at least one subband of a second TTI.

20. A non-transitory computer readable medium storing instructions executable by a processor for wireless communication, comprising instructions for: configuring resources to support sidelink communications between a first user equipment (UE) and a second UE over a shared spectrum such that at least a first set of resource blocks (RBs) within a first subband of a first transmission time interval (TTI) is available to be part of a resource pool for sidelink data communications and a second set of RBs within a second subband of the first TTI is allocated to allow transmission of sidelink synchronization signal blocks (S-SSBs); and One or more S-SSBs in the second RB set allocated for S-SSB transmission within the second subband of the first TTI are sent from the first UE to the second UE, and the first RB set within the first subband of the first TTI is included in the resource pool for use by one or more UEs for data communication on the shared spectrum.

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