Synchronized communication waveform for unlicensed sidelink (SL-U)

Abstract

Methods, systems, and devices for wireless communication are described. A wireless communication device may receive a configuration indicating SL synchronization communication resources occupying a first portion of a shared frequency band. The wireless communication device may transmit one or more SL synchronization communications occupying a second portion of the shared frequency band, wherein the second portion of the shared frequency band is larger than and includes the first portion.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of and priority to Greek Patent Application No. 20220100451, filed on May 30, 2022, and the benefit of U.S. Patent Application No. 18 / 067,482, filed on December 16, 2022, the entire contents of which are incorporated herein by reference in their entirety as if fully set forth below and for all applicable purposes. Technical Field

[0003] The following relates to wireless communications, including sidelink synchronous communication designs for shared spectrum. Background Art

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcasting, and the like. These systems may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems (such as long term evolution (LTE) systems, advanced LTE (LTE-A) systems, or LTE-A Pro systems) and fifth generation (5G) systems (which may be referred to as new radio (NR) systems). These systems may employ techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations, each of which supports wireless communication of communication devices, which may be referred to as user equipment (UE).

[0005] Some wireless communication systems may support communications between 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. Summary of the invention

[0006] The described technology relates to improved methods, systems, devices, and apparatuses for supporting sidelink synchronization signal block (S-SSB) communication in a shared frequency band. For example, the described technology provides a wireless communication device for communicating an S-SSB that occupies a larger portion of a shared frequency band than indicated in a received S-SSB resource configuration. In one aspect, the wireless communication device may be configured to send an S-SSB in an S-SSB resource using a fixed subcarrier spacing (SCS) or a fixed minimum SCS. For example, a UE may be configured with an SL resource pool associated with a first SCS, and the UE may communicate the S-SSB using a second SCS that is larger than the first SCS. Using a larger SCS may cause the S-SSB to occupy a larger portion of the shared frequency band. According to another aspect of the present disclosure, a wireless communication device may be configured to rate match at least a portion of the S-SSB to occupy a larger portion of the shared frequency band. For example, the UE may be configured with a first number of RBs for one or more S-SSBs. The UE may be configured to rate match at least a portion of the one or more S-SSBs to occupy a second number of RBs that is larger than the first number of RBs. In another aspect, a wireless communication method may include communicating an S-SSB configuration indicating one or more S-SSB slots, wherein each slot includes two or more S-SSB candidates. By providing multiple possible S-SSB candidates in each of the S-SSB slots, the network may allocate fewer S-SSB slots to the SL UE, which may reduce overhead in the shared frequency band.

[0007] According to one aspect of the present disclosure, a method of wireless communication performed by a wireless communication device may include: receiving a first configuration indicating a side link (SL) synchronous communication resource; and receiving a second configuration indicating an SL resource pool, the SL resource pool being associated with a first subcarrier spacing (SCS); sending SL synchronous communication based on a second SCS greater than the first SCS based on the first configuration; and sending SL communication based on the first SCS based on the second configuration.

[0008] According to another aspect of the present disclosure, a method of wireless communication performed by a wireless communication device may include receiving a first configuration indicating a side link (SL) synchronous communication resource, wherein the SL synchronous communication resource includes a first portion of a shared frequency band for SL synchronous communication; and based on the first configuration, sending SL synchronous communication that is rate matched to occupy a second portion of the shared frequency band, the second portion of the shared frequency band being larger than the first portion of the shared frequency band and including the first portion of the shared frequency band.

[0009] A wireless communication device, comprising: a transceiver; a memory device; and a processor, the processor communicating with the transceiver and the memory device, wherein the wireless communication device is configured to: receive a first configuration indicating a side link (SL) synchronous communication resource; receive a second configuration indicating an SL resource pool, the SL resource pool being associated with a first subcarrier spacing (SCS); send SL synchronous communication based on a second SCS greater than the first SCS based on the first configuration; and send SL communication based on the first SCS based on the second configuration.

[0010] A wireless communication device, comprising: a transceiver; a memory device; and a processor, the processor communicating with the transceiver and the memory device, wherein the wireless communication device is configured to: receive a first configuration indicating a side link (SL) synchronous communication resource, wherein the SL synchronous communication resource includes a first portion of a shared frequency band for SL synchronous communication; and based on the first configuration, send SL synchronous communication that is rate matched to occupy a second portion of the shared frequency band, the second portion of the shared frequency band being larger than the first portion of the shared frequency band and including the first portion of the shared frequency band.

[0011] A non-transitory computer-readable medium having program code recorded thereon, wherein the program code includes instructions that can be executed by a processor of a wireless communication device to cause the wireless communication device to: receive a first configuration indicating a side link (SL) synchronous communication resource; receive a second configuration indicating an SL resource pool, the SL resource pool being associated with a first subcarrier spacing (SCS); send SL synchronous communication based on a second SCS greater than the first SCS based on the first configuration; and send SL communication based on the first SCS based on the second configuration.

[0012] A non-transitory computer-readable medium having program code recorded thereon, wherein the program code includes instructions that can be executed by a processor of a wireless communication device to cause the wireless communication device to: receive a first configuration indicating side link (SL) synchronous communication resources, wherein the SL synchronous communication resources include a first portion of a shared frequency band for SL synchronous communication; and based on the first configuration, send SL synchronous communication that is rate matched to occupy a second portion of the shared frequency band, the second portion of the shared frequency band being larger than the first portion of the shared frequency band and including the first portion of the shared frequency band.

[0013] A wireless communication device, the wireless communication device comprising: a component for receiving a first configuration indicating a side link (SL) synchronous communication resource; a component for receiving a second configuration indicating an SL resource pool, the SL resource pool being associated with a first subcarrier spacing (SCS); a component for sending SL synchronous communication based on a second SCS greater than the first SCS based on the first configuration; and a component for sending SL communication based on the first SCS based on the second configuration.

[0014] A wireless communication device, comprising: a component for receiving a first configuration indicating a side link (SL) synchronous communication resource, wherein the SL synchronous communication resource includes a first portion of a shared frequency band for SL synchronous communication; and a component for sending SL synchronous communication that is rate matched to occupy a second portion of the shared frequency band based on the first configuration, the second portion of the shared frequency band being larger than the first portion of the shared frequency band and including the first portion of the shared frequency band.

[0015] The features and technical advantages of the examples according to the present disclosure have been outlined quite extensively above so that the following specific embodiments may be better understood. Additional features and advantages will be described below. The disclosed concepts and specific examples may be easily used as the basis for modifying or designing other structures for achieving the same purpose of the present disclosure. Such equivalent constructions do not depart from the scope of protection of the appended claims. When considered in conjunction with the accompanying drawings, the characteristics of the concepts disclosed herein (both their organization and methods of operation) and the associated advantages will be better understood according to the description below. Each of the accompanying drawings is provided for the purpose of illustration and description, rather than as a definition of the limitations of the claims.

[0016] Although various aspects and embodiments are described in this application by illustrating some examples, it will be understood by those skilled in the art that additional specific implementations and use cases can be generated in many different arrangements and scenarios. The innovation described herein can be implemented across many different platform types, devices, systems, shapes, sizes, and packaging arrangements. For example, each embodiment and / or use can be generated via an integrated chip embodiment and other devices based on non-module components (e.g., end-user devices, vehicles, communication equipment, computing equipment, industrial equipment, retail / shopping equipment, medical equipment, devices that enable artificial intelligence (AI), etc.). Although some examples may or may not specifically relate to use cases or applications, the innovation described may have various types of applicability. The scope of specific implementation can range from chip-level or module components to non-module, non-chip-level specific implementations, and further to aggregated, distributed or original equipment manufacturer (OEM) devices or systems in conjunction with one or more aspects of the described innovation. In some actual settings, the device in conjunction with the aspects and features must also include additional components and features for the specific implementation and practice of the embodiments protected and described by the claims. For example, the transmission and reception of wireless signals necessarily include multiple components for analog and digital purposes (e.g., hardware components including antennas, radio frequency (RF) chains, power amplifiers, modulators, buffers, processors, interleavers, adders / summers, etc.). The innovations described herein are intended to be practiced in a wide variety of devices, chip-level components, systems, distributed arrangements, end-user devices, etc., of different sizes, shapes, and configurations. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 An example of a wireless communication system supporting a sidelink synchronization signal block (S-SSB) design for shared spectrum according to one or more aspects of the present disclosure is illustrated.

[0018] Figure 2 An example of a network architecture supporting an S-SSB design for shared spectrum according to one or more aspects of the present disclosure is illustrated.

[0019] Figure 3 An example of a wireless communication system supporting an S-SSB design for shared spectrum according to one or more aspects of the present disclosure is illustrated.

[0020] Figure 4 An example of resource configuration supporting an S-SSB design for shared spectrum according to one or more aspects of the present disclosure is illustrated.

[0021] Figure 5 An example of resource configuration supporting an S-SSB design for shared spectrum according to one or more aspects of the present disclosure is illustrated.

[0022] Figure 6 An example of resource configuration supporting an S-SSB design for shared spectrum according to one or more aspects of the present disclosure is illustrated.

[0023] Figure 7 An example of resource configuration supporting an S-SSB design for shared spectrum according to one or more aspects of the present disclosure is illustrated.

[0024] Figure 8 An example of resource configuration supporting an S-SSB design for shared spectrum according to one or more aspects of the present disclosure is illustrated.

[0025] Fig. 9 An example of a process flow in a system supporting S-SSB design for shared spectrum according to one or more aspects of the present disclosure is illustrated.

[0026] Fig.10 is a diagram of an S-SSB resource configuration for communicating in a shared frequency band according to one or more aspects of the present disclosure.

[0027] Fig.11A is a diagram of an S-SSB resource configuration for communicating in a shared frequency band according to one or more aspects of the present disclosure.

[0028] Fig. 11B is a diagram of an S-SSB resource configuration for communicating in a shared frequency band according to one or more aspects of the present disclosure.

[0029] Fig. 12A is a diagram of an S-SSB resource configuration for communicating in a shared frequency band according to one or more aspects of the present disclosure.

[0030] Fig. 12B is a diagram of an S-SSB resource configuration for communicating in a shared frequency band according to one or more aspects of the present disclosure.

[0031] Fig. 12C is a diagram of an S-SSB resource configuration for communicating in a shared frequency band according to one or more aspects of the present disclosure.

[0032] Fig.13 is a block diagram of an exemplary user equipment (UE) according to some aspects of the present disclosure.

[0033] Fig.14 is a block diagram of example network entities according to some aspects of the present disclosure.

[0034] Fig.15 is a flow chart illustrating a method for conveying SL synchronous communication in a shared frequency band according to one or more aspects of the present disclosure.

[0035] Fig.16 is a flow chart illustrating a method for conveying SL synchronous communication in a shared frequency band according to one or more aspects of the present disclosure. DETAILED DESCRIPTION

[0036] Some wireless communication systems may support sidelink communications between user equipment (UEs). 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 frequency 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. An 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).

[0037] In some cases, a UE may obtain access to a sidelink BWP for transmitting a sidelink synchronization signal block (S-SSB). The S-SSB may allow other UEs to discover the UE and establish a sidelink connection with the UE for subsequent sidelink communications. However, in some examples, some waveforms of the S-SSB may not meet the OCB threshold for communications in a shared spectrum. For example, the UE may not be able to multiplex the S-SSB with other transmissions based on the waveform of the S-SSB because the S-SSB waveform may be incompatible with the waveform of one or more sidelink channels (e.g., a physical sidelink control channel (PSCCH) waveform, a physical sidelink shared channel (PSSCH) waveform, or both). In some cases, the S-SSB waveform may be incompatible with one or more resource configurations (e.g., a subchannel-based resource pool configuration). Therefore, the UE may not be able to transmit the S-SSB while meeting the OCB threshold.

[0038] According to the techniques described herein, a UE may use an S-SSB resource to communicate an S-SSB so that the S-SSB occupies a larger portion of a shared frequency band than indicated in a corresponding S-SSB configuration. For example, in some aspects, a UE may receive an S-SSB configuration indicating an S-SSB structure or configuration in a frequency domain and / or in a time domain. In some aspects, an S-SSB configuration may indicate a plurality of resource blocks (RBs), one or more S-SSB slots, and / or one or more symbols corresponding to one or more S-SSB candidate positions. In some aspects, the frequency resources configured for the S-SSB may occupy a first portion of the shared frequency band. The UE may be configured to send an S-SSB so that the S-SSB occupies a second portion of the shared frequency band, wherein the second portion is larger than the first portion indicated in the S-SSB configuration. In one example, the UE may extend the occupied bandwidth of the S-SSB by using an SCS larger than the SCS configured for the corresponding SL resource pool. In another example, the UE may extend the occupied bandwidth of the S-SSB by rate matching at least a portion of the S-SSB to occupy additional RBs in the frequency domain. In some aspects, the UE may send an S-SSB so that the S-SSB satisfies one or more of the OCB thresholds mentioned above. On the other hand, the UE may be configured with multiple S-SSB candidates in one or more S-SSB time slots. The UE may be configured to determine or select at least one of the S-SSB candidates for sending one or more S-SSBs. On the other hand, the UE may be configured with multiple S-SSB candidates, at least one of which is located in the S-SSB time slot and at least one S-SSB candidate is located in the SL resource pool. The UE may be configured to receive a signal to activate one or more S-SSB candidates in the S-SSB time slot and / or at least one S-SSB candidate in the SL resource pool.

[0039] Various aspects of the present disclosure provide many advantages. For example, by enabling the UE to communicate S-SSB using an extended frequency (e.g., by rate matching and / or by fixing the SCS to a larger SCS value), the UE can meet one or more OCB requirements or thresholds without multiplexing incompatible SL signals and / or changing the S-SSB waveform. By occupying a larger amount of resources in a shared frequency band, the amount of collisions and other errors in the shared frequency band can be reduced. In addition, by providing multiple configured S-SSB candidate locations in one or more S-SSB time slots and / or one or more SL resource pools, the overhead of SL communications in a shared frequency band can be reduced. Therefore, power consumption can also be reduced, which can improve the efficiency of SL communications in a shared frequency band.

[0040] Various aspects of the present disclosure are first described in the context of a wireless communication system. Some aspects of the present disclosure are further described with reference to resource configurations that enable efficient transmission of S-SSB. Various aspects of the present disclosure are further illustrated by and with reference to apparatus diagrams, system diagrams, resource configurations, and flow diagrams involving S-SSB designs for shared spectrum.

[0041] Figure 1 An example of a wireless communication system 100 supporting an S-SSB design for shared spectrum according to one or more aspects of the present disclosure is illustrated. The wireless communication system 100 may include one or more network entities 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a long term evolution (LTE) network, an advanced LTE (LTE-A) network, an LTE-A Pro network, a new radio (NR) network, or a network operating according to other systems and radio technologies (including future systems and radio technologies not explicitly mentioned herein).

[0042] The network entities 105 may be dispersed throughout a geographic area to form the wireless communication system 100 and may include devices that take different forms or have different capabilities. In some examples, the network entities 105 and the UEs 115 may communicate wirelessly via one or more communication links 125. For example, the network entities 105 may support a coverage area 110 (e.g., a geographic coverage area) over which the UEs 115 and the network entities 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area over which the network entities 105 and the UEs 115 may support communication of signals according to one or more radio access technologies (RATs).

[0043] The UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary or mobile, or stationary and mobile at different times. The UEs 115 may be devices that take different form factors or have different capabilities. Figure 1 Some example UEs 115 are illustrated in FIG. 1. The UEs 115 described herein may be able to communicate with various types of devices, such as Figure 1 105 or other UEs 115 or network entities 105 shown in FIG.

[0044] As described herein, a node of the wireless communication system 100 (which may be referred to as a network node or a wireless node) may be a network entity 105 (e.g., any network entity described herein), a UE 115 (e.g., any UE described herein), a network controller, an apparatus, a device, a computing system, one or more components, or another suitable processing entity configured to perform any of the techniques described herein. For example, the node may be a UE 115. As another example, the node may be a network entity 105. As another example, a first node may be configured to communicate with a second node or a third node. In one aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a UE 115. In another aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a network entity 105. In other aspects of this example, the first node, the second node, and the third node may be different relative to these examples. Similarly, references to UE 115, network entity 105, apparatus, device, computing system, etc. may include disclosure of UE 115, network entity 105, apparatus, device, computing system, etc. as nodes. For example, a disclosure that UE 115 is configured to receive information from network entity 105 also discloses that the first node is configured to receive information from a second node.

[0045] In some examples, the network entities 105 may communicate with the core network 130, or with each other, or both. For example, the network entities 105 may communicate with the core network 130 via one or more backhaul communication links 120 (e.g., according to S1, N2, N3, or other interface protocols). In some examples, the network entities 105 may communicate with each other on the backhaul communication links 120 (e.g., according to X2, Xn, or other interface protocols) directly (e.g., directly between the network entities 105) or indirectly (e.g., via the core network 130). In some examples, the network entities 105 may communicate with each other via the midhaul communication links 162 (e.g., according to the midhaul interface protocol) or the fronthaul communication links 168 (e.g., according to the fronthaul interface protocol) or any combination thereof. The backhaul communication links 120, the midhaul communication links 162, or the fronthaul communication links 168 may be or include one or more wired links (e.g., electrical links, optical fiber links), one or more wireless links (e.g., radio links, wireless optical links), etc. or various combinations thereof. UE 115 may communicate with core network 130 via communication link 155 .

[0046] One or more of the network entities 105 described herein may include or may be referred to as a base station 140 (e.g., a base transceiver station, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB), a next generation NodeB or a giga NodeB (any of which may be referred to as a gNB), a next generation eNB (ng-eNB), a home NodeB, a home eNodeB, or other suitable terms). The network entity 105 (e.g., a base station 140) may be implemented in an aggregated base station architecture or a monolithic base station architecture, or alternatively, in a decomposed base station architecture. For example, the network entity 105 may include one or more of the following: a central unit (CU) 160, a distributed unit (DU) 165, a radio unit (RU) 170, a radio access network (RAN) intelligent controller (RIC) 175 (e.g., a near real-time RIC (near RT RIC), a non-real-time RIC (non-RT RIC)), a service management and orchestration (SMO) 180 system, or any combination thereof. The RU 170 may also be referred to as a radio head, a smart radio head, a remote radio head (RRH), a remote radio unit (RRU), or a transmit / receive point (TRP). One or more components of the network entity 105 in a disaggregated RAN may be co-located, or one or more components of the network entity 105 may be located in distributed locations.

[0047] The functional split between CU 160, DU 165, and RU 170 is flexible and can support different functionalities, depending on which functions (e.g., network layer functions, protocol layer functions, baseband functions, radio frequency functions, and any combination thereof) are performed at CU 160, DU 165, or RU 170. For example, a functional split of a protocol stack can be employed between CU 160 and DU 165, such that CU 160 can support one or more layers of a protocol stack and DU 165 can support one or more different layers of a protocol stack. In some examples, CU 160 can host higher protocol layer (e.g., layer 3 (L3), layer 2 (L2)) functionality and signaling (e.g., radio resource control (RRC), service data adaptation protocol (SDAP), packet data convergence protocol (PDCP)). The CU 160 may be connected to one or more DUs 165 or RUs 170, and the one or more DUs 165 or RUs 170 may host lower protocol layers, such as layer 1 (L1) (e.g., physical (PHY) layer) or L2 (e.g., radio link control (RLC) layer, medium access control (MAC) layer) functionality and signaling, and may all be at least partially controlled by the CU 160. Additionally or alternatively, a functional split of the protocol stack may be employed between the DU 165 and the RU 170, such that the DU 165 may support one or more layers of the protocol stack, and the RU 170 may support one or more different layers of the protocol stack. The DU 165 may support one or more different cells (e.g., via one or more RUs 170). In some cases, the functional split between CU 160 and DU 165 or between DU 165 and RU 170 may be within the protocol layer (e.g., some functions of the protocol layer may be performed by one of CU 160, DU 165, or RU 170, while other functions of the protocol layer are performed by a different one of CU 160, DU 165, or RU 170). CU 160 may be further functionally split into CU control plane (CU-CP) and CU user plane (CU-UP) functions. CU 160 may be connected to one or more DUs 165 via midhaul communication links 162 (e.g., F1, F1-c, F1-u), and DU 165 may be connected to one or more RUs 170 via fronthaul communication links 168 (e.g., open fronthaul (FH) interface). In some examples, midhaul communication link 162 or fronthaul communication link 168 may be implemented based on interfaces (eg, channels) between layers of a protocol stack supported by respective network entities 105 communicating over those communication links.

[0048] In a wireless communication system (e.g., wireless communication system 100), infrastructure and spectrum resources for radio access may support wireless backhaul link capabilities to supplement wired backhaul connections, thereby providing an integrated access backhaul (IAB) network architecture (e.g., to core network 130). In some cases, in an IAB network, one or more network entities 105 (e.g., IAB nodes 104) may be partially controlled by each other. One or more IAB nodes 104 may be referred to as donor entities or IAB donors. One or more DUs 165 (e.g., one or more RUs 170) may be partially controlled by a CU 160 associated with a donor network entity 105 (e.g., a donor base station 140). One or more donor network entities 105 (e.g., IAB donors) may communicate with one or more additional network entities 105 (e.g., IAB nodes 104) via supported access and backhaul links (e.g., backhaul communication links 120). The IAB node 104 may include an IAB mobile termination (IAB-MT) controlled (e.g., scheduled) by a DU 165 of a coupled IAB donor. The IAB-MT may include an independent set of antennas for relaying communications with the UE 115, or may share the same antennas of the IAB node 104 (e.g., of the RU 170) for access via the DU 165 of the IAB node 104 (e.g., referred to as a virtual IAB-MT (vIAB-MT)). In some examples, the IAB node 104 may include a DU 165 that supports communication links with additional entities (e.g., IAB node 104, UE 115) within a relay chain or configuration (e.g., downstream) of the access network. In such a case, one or more components of the decomposed RAN architecture (e.g., one or more IAB nodes 104 or components of the IAB node 104) may be configured to operate according to the techniques described herein.

[0049] In the case where the techniques described herein are applied to the context of a decomposed RAN architecture, one or more components of the decomposed RAN architecture may be configured to support the S-SSB design for shared spectrum as described herein. For example, some operations described as being performed by a UE 115 or a network entity 105 (e.g., a base station 140) may additionally or alternatively be performed by one or more components of the decomposed RAN architecture (e.g., an IAB node 104, a DU 165, a CU 160, a RU 170, a RIC 170, a SMO 180).

[0050] UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable term, where a "device" may also be referred to as a unit, a station, a terminal, or a client, etc. UE 115 may also include or may be referred to as a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 may include or may be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communication (MTC) device, etc., which may be implemented in various objects such as electrical appliances or vehicles, meters, etc.

[0051] like Figure 1 As shown, the UE 115 described herein may be able to communicate with various types of devices, such as other UEs 115, which may sometimes act as repeaters, as well as network entities 105 and network equipment, including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, etc.

[0052] The UE 115 and the network entity 105 may wirelessly communicate with each other via one or more communication links 125 (e.g., access links) on one or more carriers. The term "carrier" may refer to a collection of radio frequency spectrum resources having a defined physical layer structure for supporting the communication link 125. For example, a carrier for the communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth portion (BWP)) operating according to one or more physical layer channels of a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling for coordinating carrier operations, user data, or other signaling. The wireless communication system 100 may support communications with the UE 115 using carrier aggregation or multi-carrier operation. Depending on the carrier aggregation configuration, the UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation may be used for both frequency division duplex (FDD) and time division duplex (TDD) component carriers. Communication between the network entity 105 and other devices may refer to communication between these devices and any part (e.g., entity, sub-entity) of the network entity 105. For example, the terms "send", "receive", or "communicate" when referring to the network entity 105 may refer to any part of the network entity 105 (e.g., base station 140, CU 160, DU 165, RU 170) of the RAN communicating with another device (e.g., directly or via one or more other network entities 105).

[0053] In some examples, such as in a carrier aggregation configuration, a carrier may also have acquisition signaling or control signaling that coordinates the operation of other carriers. A carrier may be associated with a frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and may be located based on a channel raster for discovery by UE 115. A carrier may operate in a standalone mode, in which case initial acquisition and connection may be performed by UE 115 via the carrier, or a carrier may operate in a non-standalone mode, in which case the connection is anchored using a different carrier (e.g., a different carrier of the same or different radio access technology).

[0054] The communication link 125 shown in the wireless communication system 100 may include downlink transmissions (e.g., forward link transmissions) from the network entity 105 to the UE 115, uplink transmissions (e.g., return link transmissions) from the UE 115 to the network entity 105, or both, as well as other transmission configurations. A carrier may carry either downlink communications or uplink communications (e.g., in FDD mode), or may be configured to carry both downlink communications and uplink communications (e.g., in TDD mode).

[0055] A carrier may be associated with a particular bandwidth of a radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as a "system bandwidth" of the carrier or wireless communication system 100. For example, the carrier bandwidth may be one of a set of bandwidths (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)) of a carrier of a particular radio access technology. A device (e.g., a network entity 105, a UE 115, or both) of the wireless communication system 100 may have a hardware configuration that supports communication on a particular carrier bandwidth or may be configurable to support communication on one of the carrier bandwidths in the set of carrier bandwidths. In some examples, the wireless communication system 100 may include a network entity 105 or a UE 115 that supports concurrent communication via carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured to operate on a portion (e.g., a subband, a BWP) or all of a carrier bandwidth.

[0056] The signal waveform sent on the carrier may include multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques, such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system using MCM technology, a resource element may refer to a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period and subcarrier spacing may be inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both), so that the more resource elements a device receives and the higher the order of the modulation scheme, the higher the data rate for the device may be. Wireless communication resources may refer to a combination of radio frequency spectrum resources, time resources, and spatial resources (e.g., spatial layers, beams), and the use of multiple spatial resources may increase the data rate or data integrity of communications with UE 115.

[0057] One or more numerologies of a carrier may be supported, where the numerologies may include subcarrier spacing (Δf) and cyclic prefixes. A carrier may be divided into one or more BWPs with the same or different numerologies. In some examples, a UE 115 may be configured with multiple BWPs. In some examples, a single BWP of a carrier may be active at a given time, and communications of a UE 115 may be constrained to one or more active BWPs.

[0058] The time interval for the network entity 105 or the UE 115 may be expressed as a multiple of a basic time unit, which may be, for example, a sampling period T s =1 / (Δf max ·N f ) seconds, where Δf max It can represent the maximum supported subcarrier spacing, and N f The maximum supported discrete Fourier transform (DFT) size may be indicated. Time intervals of communication resources may be organized according to radio frames each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023).

[0059] Each frame may include a plurality of consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, a frame may be divided into subframes (e.g., in the time domain), and each subframe may be further divided into a certain number of time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include a certain number of symbol periods (e.g., depending on the length of the cyclic prefix added before each symbol period). In some wireless communication systems 100, a time slot may be further divided into a plurality of micro time slots including one or more symbols. Excluding the cyclic prefix, each symbol period may include one or more (e.g., N f The duration of a symbol period may depend on the subcarrier spacing or the operating frequency band.

[0060] A subframe, a time slot, a mini-time slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in a burst of a shortened TTI (sTTI)).

[0061] Physical channels may be multiplexed on a carrier according to various techniques. For example, physical control channels and physical data channels may be multiplexed on a downlink carrier using one or more of a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique. A control region (e.g., a control resource set (CORESET)) of a physical control channel may be defined by a set of symbol periods and may extend across a system bandwidth or a subset of a system bandwidth of a carrier. One or more control regions (e.g., CORESETs) may be configured for a group of UEs 115. For example, one or more of the UEs 115 may monitor or search the control region for control information according to one or more search space sets, and each search space set may include one or more control channel candidates in one or more aggregation levels arranged in a cascaded manner. The aggregation level of the control channel candidates may refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with the coding information for a control information format having a given payload size. The search space sets may include a common search space set configured for transmitting control information to a plurality of UEs 115 , and a UE-specific search space set for transmitting control information to a specific UE 115 .

[0062] In some examples, the network entities 105 (e.g., base stations 140, RUs 170) may be mobile and thus provide communication coverage for mobile coverage areas 110. In some examples, different coverage areas 110 associated with different technologies may overlap, but the different coverage areas 110 may be supported by the same network entity 105. In some other examples, overlapping coverage areas 110 associated with different technologies may be supported by different network entities 105. The wireless communication system 100 may include, for example, a heterogeneous network in which different types of network entities 105 provide coverage for various coverage areas 110 using the same or different radio access technologies.

[0063] The wireless communication system 100 can be configured to support ultra-reliable communication or low-latency communication or various combinations thereof. For example, the wireless communication system 100 can be configured to support ultra-reliable low-latency communication (URLLC). UE 115 can be designed to support ultra-reliable, low-latency or critical functions. Ultra-reliable communication may include private communication or group communication, and may be supported by one or more services (such as push-to-talk, video or data). Support for ultra-reliable, low-latency functions may include prioritization of services, and such services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency and ultra-reliable low-latency may be used interchangeably herein.

[0064] In some examples, UE 115 may be able to communicate directly with other UEs 115 over a device-to-device (D2D) communication link 135 (e.g., according to a peer-to-peer (P2P), D2D, or sidelink protocol). In some examples, one or more UEs 115 in a group that are performing D2D communications may be within a coverage area 110 of a network entity 105 (e.g., base station 140, RU 170), which may support aspects of such D2D communications configured or scheduled by the network entity 105. In some examples, one or more UEs 115 in such a group may be outside of the coverage area 110 of the network entity 105, or may otherwise be unable or not configured to receive transmissions from the network entity 105. In some examples, multiple groups of UEs 115 communicating via D2D communications may support a one-to-many (1:M) system in which each UE 115 transmits to each of the other UEs 115 in the group. In some examples, the network entity 105 may facilitate scheduling resources for D2D communications. In some other examples, D2D communications may be performed between UEs 115 without involving network entity 105 .

[0065] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), which may include at least one control plane entity for managing access and mobility (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) and at least one user plane entity for routing packets or interconnecting to an external network (e.g., a serving gateway (S-GW)), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)). The control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management of UE 115 served by a network entity 105 (e.g., a base station 140) associated with the core network 130. User IP packets may be delivered through the user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to an IP service 150 for one or more network operators. The IP services 150 may include access to the Internet, an intranet, an IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0066] A UE 115 attempting to access a wireless network may perform an initial cell search by detecting a primary synchronization signal (PSS) from a network entity 105 or from another UE 115. The PSS may enable synchronization of time slot timing and may indicate a physical layer identification value. Then, the UE 115 may receive a secondary synchronization signal (SSS). The SSS may enable radio frame synchronization and may provide a cell identification value, which may be combined with a physical layer identification value to identify a cell. The SSS may also enable detection of a duplex mode and a cyclic prefix length. Some systems (such as TDD systems) may transmit SSS but not PSS. Both PSS and SSS may be located, for example, in the center 62 subcarriers and 72 subcarriers of a carrier, respectively. In some cases, a wireless device may use multiple beams to send synchronization signals (e.g., PSS SSS, etc.) in a beam scanning manner. In some cases, PSS, SSS, and / or broadcast information (e.g., physical broadcast channel (PBCH)) may be sent in different synchronization signal blocks (SSBs) on corresponding directional beams, wherein one or more SSBs may be included in a burst.

[0067] The wireless communication system 100 may operate using one or more frequency bands that may be in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Typically, the region from 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelength range length is about one decimeter to one meter. The UHF waves may be blocked or redirected by buildings and environmental features, and these waves may be referred to as clusters, but these waves may be sufficient to penetrate structures so that macro cells provide services to UEs 115 located indoors. Transmission of UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) compared to transmission using smaller frequencies and longer wavelengths of the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0068] The wireless communication system 100 may utilize both licensed radio frequency spectrum bands and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 may employ licensed assisted access (LAA), LTE-unlicensed (LTE-U) radio access technology, or NR technology in unlicensed bands such as the 5 GHz industrial, scientific, and medical (ISM) band. When operating in an unlicensed radio frequency spectrum band, devices such as network entities 105 and UEs 115 may employ carrier sensing for conflict detection and avoidance. In some examples, operations in unlicensed bands may be based on a carrier aggregation configuration (e.g., LAA) combined with component carriers operating in licensed bands. Operations in unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, and the like.

[0069] The network entity 105 (e.g., base station 140, RU 170) or UE 115 may be equipped with multiple antennas, which can be used to employ technologies such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication or beamforming. The antennas of the network entity 105 or UE 115 may be located in one or more antenna arrays or antenna panels, which can support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some examples, the antennas or antenna arrays associated with the network entity 105 may be located at different geographical locations. The network entity 105 may have an antenna array having a set of rows and columns of antenna ports that the network entity 105 can use to support beamforming for communications with the UE 115. Similarly, the UE 115 may have one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming for signals sent via the antenna ports.

[0070] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a network entity 105, a UE 115) to shape or direct an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals communicated via antenna elements of an antenna array so that some signals propagating in a particular direction relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals communicated via antenna elements may include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to signals carried via antenna elements associated with the device. Adjustments associated with each of these antenna elements may be defined by a set of beamforming weights associated with a particular direction (e.g., relative to the antenna array of the transmitting device or the receiving device or relative to some other direction).

[0071] The wireless communication system 100 may include one or more UEs 115 that may communicate directly with other UEs 115 via a D2D communication link 135 (e.g., according to a P2P, D2D, or sidelink protocol). In some cases, the UEs 115 may communicate using one or more radio frequency bands associated with a shared spectrum (e.g., unlicensed radio spectrum bands). In some cases, the UEs 115 may configure one or more communication parameters to meet an OCB threshold, which may be specified in a wireless communication standard. However, some sidelink signaling may not meet the OCB threshold.

[0072] The wireless communication system 100 may support an S-SSB waveform that is transparent to PSCCH, PSSCH, and other sidelink signals. In addition, the S-SSB waveform may enable the UE 115 to meet the OCB threshold when communicating in a shared radio frequency spectrum band. The UE 115 may send one or more S-SSBs using time-frequency resources that enable the UE 115 to multiplex the S-SSB with PSSCH signaling (e.g., in the frequency domain). In some cases, the UE 115 may use TDM techniques, FDM techniques, or hybrid TDM-FDM techniques to simultaneously send S-SSB and PSSCH signaling. The UE 115 may send an S-SSB using four symbols of a time slot (e.g., a 14-symbol time slot), which may be different from the first four symbols (e.g., the initial four symbols) of the time slot (e.g., to avoid time-frequency resources allocated for PSCCH and other signaling).

[0073] Figure 2An example of a network architecture 200 (e.g., a disaggregated base station architecture, a disaggregated RAN architecture) supporting an S-SSB design for shared spectrum according to one or more aspects of the present disclosure is illustrated. The network architecture 200 may illustrate an example for implementing one or more aspects of the wireless communication system 100. The network architecture 200 may include one or more CUs 160-a, which may communicate directly with a core network 130-a via a backhaul communication link 120-a, or indirectly with a core network 130-a through one or more disaggregated network entities 105 (e.g., a near-RT RIC 175-b via an E2 link, or a non-RT RIC 175-a associated with an SMO 180-a (e.g., an SMO framework), or both. The CU 160-a may communicate with one or more DUs 165-a via corresponding midhaul communication links 162-a (e.g., an F1 interface). The DU 165-a may communicate with one or more RUs 170-a via corresponding fronthaul communication links 168-a. The RUs 170-a may be associated with respective coverage areas 110-a and may communicate with the UEs 115-a via one or more communication links 125-a. In some implementations, a UE 115-a may be simultaneously served by multiple RUs 170-a.

[0074] Each of the network entities 105 of the network architecture 200 (e.g., CU 160-a, DU 165-a, RU 170-a, non-RT RIC 175-a, near-RT RIC 175-b, SMO 180-a, open cloud (O-Cloud) 205, open eNB (O-eNB) 210) may include one or more interfaces or may be coupled to one or more interfaces configured to receive or send signals (e.g., data, information) via a wired or wireless transmission medium. Each network entity 105 or an associated processor (e.g., a controller) that provides instructions to an interface of the network entity 105 may be configured to communicate with one or more of the other network entities 105 via a transmission medium. For example, these network entities 105 may include a wired interface that is configured to receive signals on a wired transmission medium or to send signals to one or more of the other network entities 105 on a wired transmission medium. Additionally or alternatively, the network entity 105 may include a wireless interface, which may include a receiver, a transmitter, or a transceiver (e.g., an RF transceiver) configured to receive signals on a wireless transmission medium, or to send signals to one or more of the other network entities 105 on a wireless transmission medium, or both.

[0075] In some examples, CU 160-a may host one or more higher layer control functions. Such control functions may include RRC, PDCP, SDAP, etc. Each control function may be implemented with an interface configured to communicate signals with other control functions hosted by CU 160-a. CU 160-a may be configured to process user plane functionality (e.g., CU-UP), control plane functionality (e.g., CU-CP), or a combination thereof. In some examples, CU 160-a 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 160-a may be implemented to communicate with DU 165-a for network control and signaling.

[0076] DU 165-a may correspond to a logical unit that includes one or more functions (e.g., base station functions, RAN functions) for controlling the operation of one or more RUs 170-a. In some examples, DU 165-a may at least partially host one or more of the RLC layer, the MAC layer, and one or more aspects of the PHY layer (e.g., a high PHY layer, such as modules for FEC encoding and decoding, scrambling, modulation and demodulation, etc.), which depends at least in part on functional divisions, such as those defined by the Third Generation Partnership Project (3GPP). In some examples, DU 165-a may also host one or more low PHY layers. Each layer may be implemented with an interface that is configured to communicate signals with other layers hosted by DU 165-a or with control functions hosted by CU160-a.

[0077] In some examples, lower layer functionality may be implemented by one or more RUs 170-a. For example, a RU 170-a controlled by a DU 165-a may correspond to a logical node that hosts RF processing functions or low PHY layer functions (e.g., 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 this architecture, RU 170-a may be implemented to handle over-the-air (OTA) communications with one or more UEs 115-a. In some specific implementations, real-time and non-real-time aspects of control plane and user plane communications with RU 170-a may be controlled by the corresponding DU 165-a. In some examples, this configuration may enable DU 165-a and CU 160-a to be implemented in a cloud-based RAN architecture (such as a vRAN architecture).

[0078] The SMO 180-a may be configured to support RAN deployment and provisioning of non-virtualized and virtualized network entities 105. For non-virtualized network entities 105, the SMO 180-a 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 (e.g., an O1 interface). For virtualized network entities 105, the SMO 180-a may be configured to interact with a cloud computing platform (e.g., O-Cloud 205) via a cloud computing platform interface (e.g., an O2 interface) to perform network entity lifecycle management (e.g., to instantiate virtualized network entities 105). Such virtualized network entities 105 may include, but are not limited to, CU 160-a, DU 165-a, RU 170-a, and near-RT RIC 175-b. In some specific implementations, the SMO 180-a may communicate with components configured according to a 4G RAN (e.g., via an O1 interface). Additionally or alternatively, in some implementations, the SMO 180-a may communicate directly with one or more RUs 170-a via an O1 interface. The SMO 180-a may also include a non-RT RIC 175-a configured to support the functionality of the SMO 180-a.

[0079] The non-RT RIC 175-a may be configured to include logic functions that implement non-real-time control and optimization of RAN elements and resources, artificial intelligence (AI) or machine learning (ML) workflows (including model training and updating, or policy-based guidance of applications / features in the near-RT RIC 175-b). The non-RT RIC 175-a may be coupled to or communicate with the near-RT RIC 175-b (e.g., via an A1 interface). The near-RT RIC 175-b may be configured to include logic functions that implement near real-time control and optimization of RAN elements and resources via data collection and actions on an interface connecting one or more CUs 160-a, one or more DUs 165-a, or both, and the O-eNB 210 to the near-RT RIC 175-b (e.g., via an E2 interface).

[0080] In some examples, in order to generate an AI / ML model to be deployed in the near-RT RIC 175-b, the non-RT RIC 175-a may receive parameters or external enrichment information from an external server. Such information may be utilized by the near-RT RIC 175-b and may be received from a non-network data source or from a network function at the SMO 180-a or the non-RT RIC 175. In some examples, the non-RT RIC 175-a or the near-RT RIC 175-b may be configured to tune RAN behavior or performance. For example, the non-RT RIC 175-a may monitor long-term trends and patterns of performance and employ an AI model or ML model to perform corrective actions through the SMO 180-a (e.g., via reconfiguration of O1) or via the generation of a RAN management policy (such as an A1 policy).

[0081] The network architecture 200 can support UE 115-a to establish an access link and / or a side link. In some cases, UE 115-a can establish an access link with a network entity 105 (e.g., CU 160-a, DU 165-a, RU 170-a, non-RT RIC 175-a, near-RT RIC 175-b, SMO 180-a, O-Cloud 205, O-eNB 210) and a side link (e.g., a side link communication link) with another UE 115-a. In some cases, UE 115-a can establish an access link with the network entity 105 and can establish a side link with another UE 115-a operating as a relay (e.g., which has an access link with the same or different network entity 105 as UE 115-a), so that UE 115-a can communicate with the network via the access link or the side link or both. In some cases, UE 115-a may use a side link to extend coverage area 110-a. For example, UE 115-a may establish a side link with another UE 115-a (e.g., a relay UE) that has an access link with a network entity 105 that is outside of its coverage area.

[0082] In some cases, UE 115-a may communicate using one or more radio frequency bands (e.g., unlicensed radio spectrum bands) associated with a shared spectrum. In some cases, UE 115-a may use one or more parameters to meet the OCB threshold. However, some sidelink signaling may not meet the OCB threshold. The network architecture 200 may support an S-SSB waveform that is transparent to PSCCH, PSSCH, and other sidelink signals, and the S-SSB waveform may enable UE 115-a to meet the OCB threshold when communicating in a shared radio frequency spectrum band. UE 115-a may send one or more S-SSBs using time-frequency resources that enable UE 115-a to multiplex the S-SSB with PSSCH signaling (e.g., in the frequency domain). In particular, the S-SSB sent by UE 115-a may use a waveform so that one or more S-SSBs are sent using time-frequency resources that enable the UE to multiplex the S-SSB with PSSCH signaling in the frequency domain. Here, the UE may use four symbols of a time slot to send the S-SSB, and may use four symbols different from the first four symbols of the time slot to transmit the S-SSB (e.g., to avoid time-frequency resources allocated for PSCCH signaling).

[0083] Figure 3 An example of a wireless communication system 300 supporting an S-SSB design for a shared spectrum according to one or more aspects of the present disclosure is illustrated. The wireless communication system 300 may implement aspects of the wireless communication system 100. For example, the wireless communication system 300 may include a UE 115-b and a UE 115-c, which may be reference UEs. Figure 1 An example of a corresponding UE 115 is described. The wireless communication system 300 can support the use of an S-SSB waveform, which can be multiplexed with PSCCH / PSSCH in the same subchannel (e.g., a 20 MHz subchannel) in a time slot, and the S-SSB waveform can avoid affecting PSCCH decoding while also avoiding resources configured for DMRS and SCI (e.g., SCI-2).

[0084] The wireless communication system 300 may be an example of a 5G NR system and may support wireless devices to establish access links (e.g., Uu interfaces) and / or side links (e.g., PC5 interfaces). For example, a UE 115 may establish an access link with a network entity 105 and a side link (e.g., a side link communication link) with another UE 115. In some cases, a UE 115 may establish an access link with a network entity 105 and may establish a side link with another UE 115 operating as a relay (e.g., an access link with a network entity 105 that is the same or different from the UE 115), so that the UE 115 may communicate with the network via the access link or the side link or both. In some cases, a device may use a side link to extend a coverage area. For example, a UE 115 may establish a side link with another UE 115 (e.g., a relay UE) that has an access link with a network entity 105 that is outside of its coverage. Sidelink communication may be referred to as vehicle-to-vehicle (V2V) communication, vehicle-to-everything (V2X) communication, D2D communication, or other terminology.

[0085] The wireless communication system 300 may include a communication link 315, which may be as described in reference Figure 1 An example of a sidelink (e.g., a D2D communication link 135) is described. UE 115-b may send information to UE 115-c via the sidelink, and UE 115-c may similarly send information to UE 115-b via the sidelink. As an example, UE 115-b may send a PSSCH transmission 310 and / or one or more S-SSBs 305 to UE 115-c. In some cases, UE 115-b may use time-frequency resources that are not synchronized with the operation of UE 115-c for transmission. For example, UE 115-b may use a first time slot to send a PSSCH transmission 310, and UE 115-c may not know the time slot boundary to be used to receive the PSSCH transmission 310. Thus, UE 115-b may (e.g., periodically) send one or more S-SSBs 305, which may facilitate synchronization of communications between multiple UEs 115. UE 115-c may receive S-SSB 305 and perform one or more operations to synchronize time-frequency resources with UE 115-b. In some cases, S-SSB 305 may include PSS and SSS. UE 115 may send S-SSB 305 using multicast, groupcast, or broadcast signaling.

[0086] The wireless communication system 300 can 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. For example, UE 115-b can send a PSSCH transmission 310 to UE 115-c using one or more unlicensed radio frequency bands. UE 115-b can perform one or more channel access procedures to obtain access to one or more unlicensed frequency bands. For example, UE 115 can 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 transmitting signals. After obtaining access to the shared spectrum, UE 115-b can send signaling using multiple symbol periods within a time slot (e.g., OFDM symbol periods), which can be an example of a TTI.

[0087] The shared spectrum may be associated with one or more conditions for spectrum use. In some cases, the conditions for shared spectrum use may be associated with an OCB. The OCB may be defined as a bandwidth that includes a portion (e.g., 99%) of the total signal power. For example, a UE 115 may utilize a nominal bandwidth to transmit a signal. However, a signal (e.g., a measured signal) may occupy a portion of the nominal bandwidth (e.g., due to variations in signal power). In some cases, the OCB may be less than the nominal bandwidth.

[0088] Conditions for shared spectrum use may include thresholds associated with OCB. For example, a wireless communication standard may specify a threshold percentage of the total signal power of a corresponding channel, which may be referred to herein as a "threshold OCB" or "OCB threshold." In some other cases, the wireless communication standard may specify a threshold percentage of the total signal power, a threshold bandwidth, or both. The wireless communication system 300 may support one or more OCB thresholds for shared spectrum communications to reduce the percentage of signal bandwidth outside of the bandwidth allocated for communications between UEs 115 (e.g., to reduce interference and achieve fairness to other transmitting devices in the system). The OCB threshold may be expressed as a minimum percentage of the nominal channel bandwidth that will be occupied. For example, a wireless communication standard may specify that the OCB is greater than 80% of the corresponding nominal channel bandwidth.

[0089] In some cases, transmissions may be multiplexed to increase OCB. For example, for non-sidelink transmissions, SSBs may be multiplexed in the downlink with one or more other transmissions, such as channel state information reference signal (CSI-RS) transmissions, remaining minimum system information (RMSI) transmissions, physical downlink control channel (PDCCH) transmissions, physical downlink shared channel (PDSCH) transmissions, and other transmission types (e.g., non-unicast transmissions). However, in some cases, UE 115 may not be able to meet the minimum OCB threshold, such as for some transmissions of S-SSB. For example, UE 115-b may not be able to send an S-SSB to UE 115-c when the OCB threshold is met.

[0090] In particular, UE 115-b may use some techniques for sending S-SSB according to the configuration of S-SSB so that S-SSB occupies the full time slot. Here, UE 115-b 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., the 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 configurations). For example, the resource pool used for S-SSB may not overlap with the resource pool used for other transmissions. Therefore, UE 115 may not be able to send S-SSB while meeting the OCB threshold. As an illustrative example, UE 115-b may use a time slot (e.g., 14 symbols including gap symbols) to send S-SSB, where the S-SSB may occupy 11 resource blocks RB of the BWP. However, the time slot used for S-SSB may not be used for other message types, such as PSSCH transmission 310. When no other signals are transmitted along with the S-SSB in a time slot, the OCB threshold may not be met, and some S-SSB transmissions may therefore not occupy more than 80% of the corresponding nominal channel bandwidth.

[0091] According to the techniques described herein, a UE 115 may transmit one or more S-SSBs 305 that may be multiplexed with a PSCCH / PSSCH in the same subchannel (20 MHz subchannel) in a TTI (e.g., a time slot). For example, a UE 115 may transmit one or more S-SSBs 305 using a portion of a time slot and avoiding time-frequency resources used for other transmission types (such as PSCCH transmissions, AGC symbols, DMRS transmissions, and other transmission types). The UE 115 may transmit the S-SSB 305 using four symbol periods following the first four symbol periods of the time slot. In other words, the four symbol periods used for the S-SSB transmission may be different from the first four symbols of the time slot. In some cases, the UE 115 may transmit one or more S-SSBs using a waveform configuration, which may enable the UE 115 to multiplex (e.g., FDM or TDM) the S-SSBs with other transmissions (e.g., PSSCH transmissions). Therefore, UE 115 may configure one or more waveform parameters for S-SSB to increase OCB and meet the OCB threshold.

[0092] Figure 4 An example of a resource configuration 400 supporting an S-SSB design for shared spectrum according to one or more aspects of the present disclosure is illustrated. The resource configuration 400 may be implemented by aspects of the wireless communication system 100 and the wireless communication system 300. For example, the resource configuration 400 may be implemented for sidelink communications by one or more UEs, such as described by the wireless communication system 300. The resource configuration 400 may support the use of an S-SSB waveform that may be multiplexed with the PSCCH / PSSCH in the same subchannel (e.g., a 20 MHz subchannel) in a timeslot, and the S-SSB waveform may not have an impact on PSCCH decoding, while also avoiding resources configured for DMRS and SCI (e.g., SCI-2).

[0093] Resource configuration 400 may include time-frequency resources for one or more transmission types. For example, resource configuration 400 may include time-frequency resources for S-SSB 405. In some cases, UE 115 may transmit one or more S-SSBs 405. Resource configuration 400 may be a representation of time-frequency resources, a transmission using time-frequency resources, or both. For example, S-SSB 405 may be an example of a transmission or a time-frequency resource used for a transmission.

[0094] As described herein, the UE 115 may multiplex the S-SSB 405 with the PSSCH resources 410. For example, a portion of the PSSCH resources 410 may overlap with the S-SSB 405. The UE 115 may multiplex the S-SSB 405 with the PSSCH resources 410 to meet the OCB threshold, where the multiplexed signaling may fill 80% of a 20 MHz channel. The UE 115 may send the S-SSB 405 using a certain number of symbols and a certain number of RBs. For example, the UE 115 may send the S-SSB 405 using 4 symbols and 11 RBs. In some other cases, the UE 115 may send the S-SSB 405 using 4 symbols and 20 RBs. The UE 115 may select a time-frequency resource for the S-SSB 405 that does not overlap with a certain number of time-frequency resources configured for other types of signaling. For example, UE 115 may select four symbols for transmitting S-SSB 405, which may be different from the initial four symbols of the time slot.

[0095] In some cases, the UE 115 may select one or more time-frequency resources for the S-SSB 405 to avoid one or more time-frequency resources for other transmissions. For example, the UE 115 may select one or more time-frequency resources for the S-SSB 405, which may be different from the PSCCH resources 415. Additionally or alternatively, the UE 115 may select one or more time-frequency resources for the S-SSB 405, which may be different from the AGC symbol 420. In some cases, the AGC symbol 420 may span a subband. In some cases, the PSCCH resource 415 may span a portion of a subband. Additionally or alternatively, the S-SSB 405 may span a portion of a subband. In some cases, the UE 115 may select one or more time-frequency resources for the S-SSB 405, which may be different from the PSCCH resource 415, so that PSCCH decoding is not affected by the S-SSB 405.

[0096] In some cases, the UE 115 may multiplex the S-SSB 405 and the PSSCH resources 410 within a subband. For example, the S-SSB 405 and the PSSCH resources 410 may be included in a single subband, which may be an example of a 20 MHz subchannel. Additionally or alternatively, a subband (e.g., a subchannel) may include an AGC symbol 420 and a PSCCH resource 415. A subband may be an example of a subband or channel of an unlicensed spectrum (e.g., a shared spectrum). In some other cases, a subband may be an example of a subband or channel of a licensed spectrum.

[0097] The UE 115 may send control signaling that may indicate one or more time-frequency resources associated with the S-SSB 405 (e.g., the location of the S-SSB 405). For example, the UE 115 may send an SCI message that may indicate a subband used for the S-SSB 405. In some cases, the SCI message may indicate one or more symbols of the S-SSB 405. Additionally or alternatively, the SCI message may indicate one or more time slots used for the S-SSB 405. In some cases, the SCI message may be an SCI-1 message. In some cases, the UE 115 may send an indication of one or more RBs for the SSB-405 via master information block (MIB) signaling, RMSI signaling, RRC signaling, or any combination thereof.

[0098] In some cases, the UE 115 may perform one or more rate matching operations associated with the S-SSB 405. For example, the UE 115 may rate match the PSCCH resources 415 around the S-SSB 405. In some cases, the UE 115 may rate match any combination of the PSCCH resources 415, the SCI (e.g., SCI-2), and the DMRS resources around the S-SSB 405. In some cases, the UE 115 may send an SCI message that may include a bit indicating whether the S-SSB 405 is included in a subband. The UE 115 may receive the SCI message and determine whether one or more rate matching operations are associated with the S-SSB 405 based on the bit indicating whether the S-SSB 405 is included in the subband.

[0099] although Figure 4 A specific location of the S-SSB 405 is shown, but the S-SSB 405 can be located in various other locations. For example, the UE 115 can send the S-SSB 405 using any four symbols different from the first four symbols in sequence of the time slot. The four symbols can be consecutive symbols. In some cases, the time slot may include 14 symbols (e.g., 13 symbols and a gap symbol). The UE 115 can send the S-SSB 405 using symbols five to eight in the time slot. Additionally or alternatively, the UE 115 can send the S-SSB 405 using symbols ten to thirteen. Similarly, the UE 115 can send the S-SSB 405 using any combination of 11 RBs or 20 RBs within the subband. The 11 RBs or 20 RBs can be consecutive RBs.

[0100] In some cases, the UE 115 may send broadband signaling, which may include multiple subbands. In some cases, the UE 115 may use one or more of the multiple subbands (e.g., one or more subbands of the broadband transmission) to send the S-SSB 405. In this case, the UE 115 may send control information (e.g., SCI-1 message) within the PSCCH resource 415, and the control information may indicate which one or more of the multiple subbands include the S-SSB 405. In some cases, if the S-SSB 405 is dynamic, the control information may indicate one or more of the multiple subbands. In some cases, the control information may include a bitmap that may indicate one or more subbands that include the S-SSB 405. The bitmap may include a first bit that may indicate a leading subband that includes the control information (e.g., SCI-1). Additionally or alternatively, the bitmap may include a second bit that may indicate an additional subband (e.g., a subsequent subband) containing control information. In some cases, the broadband signaling may include four subbands or five subbands. In some other cases, wideband signaling may include fewer than four subbands or more than five subbands.

[0101] The UE 115 may send the S-SSB 405 using one subband. In this case, the UE 115 may send a message including a subband index field, which may indicate which subband includes the S-SSB 405. The value of the subband index field may indicate that the S-SSB 405 is not present in the time slot (e.g., in a time slot of one or more subbands that do not include the S-SSB 405). In some cases, the subband index may be a relative index. In some cases, the control information carrying the subband may be associated with a modulo operation. Additionally or alternatively, the subband index may be an absolute index (e.g., within a four-subband grid or a five-subband grid). In some cases, the UE 115 may send the S-SSB 405 using the same subband that includes the SCI (e.g., SCI-1). In this case, a bit (e.g., a single bit) may indicate which subband includes the S-SSB 405 (e.g., the same subband in which the SCI is received).

[0102] Figure 5An example of a resource configuration 500 supporting an S-SSB design for shared spectrum in accordance with one or more aspects of the present disclosure is illustrated. The resource configuration 500 may be implemented by aspects of the wireless communication system 100 and the wireless communication system 300. For example, the resource configuration 500 may be implemented for sidelink communications by one or more UEs, such as described by the wireless communication system 300. The resource configuration 500 may support the use of an S-SSB waveform that may be multiplexed with the PSCCH / PSSCH in the same subchannel (e.g., a 20 MHz subchannel) in a timeslot, and the S-SSB waveform may not have an impact on PSCCH decoding, while also avoiding resources configured for DMRS and SCI (e.g., SCI-2).

[0103] Resource configuration 500 may include time-frequency resources for one or more transmission types. For example, resource configuration 500 may include time-frequency resources for S-SSB 505. In some cases, such as reference Figure 1 As described, UE 115 may transmit one or more S-SSBs 505. In some cases, resource configuration 500 may be a representation of a time-frequency resource, a transmission using a time-frequency resource, or both. For example, S-SSB 505 may be an example of a transmission or a time-frequency resource used for transmission.

[0104] As described herein, the UE 115 may multiplex the S-SSB 505 with the PSSCH resources 510. For example, a portion of the PSSCH resources 510 may overlap with the S-SSB 505. In some cases, the UE 115 may multiplex the S-SSB 505 with the PSSCH resources 510 to meet the OCB threshold. For example, the multiplexed signaling may fill 80% of a 20 MHz channel. In some cases, the UE 115 may send the S-SSB 505 using a certain number of symbols and a certain number of RBs. For example, the UE 115 may send the S-SSB 505 using 4 symbols and 11 RBs. In some other cases, the UE 115 may send the S-SSB 505 using 4 symbols and 20 RBs. In some cases, the UE 115 may select a time-frequency resource for the S-SSB 505 that does not overlap with a certain number of time-frequency resources used for other signals sent in the time slot (e.g., TTI). For example, UE 115 may select four symbols for transmitting S-SSB 505, which may be different from the initial four symbols of the time slot.

[0105] Additionally or alternatively, the UE 115 may select one or more time-frequency resources for the S-SSB 505 to avoid one or more time-frequency resources for other transmissions. For example, the UE 115 may select one or more time-frequency resources for the S-SSB 505 that may be different from the PSCCH resources 515, the AGC symbols 520, the DMRS resources 525, and the SCI-2 resources 530. In some cases, the UE 115 may select one or more time-frequency resources for the S-SSB 505 that may be different from the PSCCH resources 515 so that PSCCH decoding is not affected by the S-SSB 505. Additionally or alternatively, the UE 115 may select one or more time-frequency resources for the S-SSB 505 that may be different from the DMRS resources 525 and the SCI-2 resources 530 so that DMRS and SCI-2 demodulation and decoding are not affected by the presence of the S-SSB 505.

[0106] The UE 115 may send control signaling that may indicate one or more time-frequency resources associated with the S-SSB 505 (e.g., the location of the S-SSB 505). For example, the UE 115 may send an SCI message within the PSCCH resource 515 that may indicate a subband for the S-SSB 505. In some cases, the SCI message may indicate one or more symbols of the S-SSB 505. Additionally or alternatively, the SCI message may indicate one or more time slots for the S-SSB 505. In some cases, the SCI message may be an SCI-2 message. In some cases, the UE 115 may send an indication of one or more RBs for the SSB-505 via master information block (MIB) signaling, RMSI signaling, RRC signaling, or any combination thereof.

[0107] The configuration (eg, waveform configuration) of S-SSB 505 may be based on the configuration of DMRS resources 525 and the configuration of PSCCH resources 515. For example, various time-frequency resources may be used for DMRS and PSCCH signaling. Figure 5 An example of a configuration for DMRS resources 525 and PSCCH resources 515 may be shown. In some cases, the location of DMRS resources 525 (eg, the location with resource configuration 500) may be different from Figure 5 Similarly, the aa position of PSCCH resource 515 (eg, the position having resource configuration 500) may be different from Figure 5. Therefore, UE 115 may select a time-frequency resource for S-SSB 505 that may be different from multiple potential locations for PSCCH resources 515 and DMRS resources 525. That is, UE 115 may select a location for S-SSB 505 to avoid overlapping of the location of S-SSB 505 with time-frequency resources allocated for other purposes, such as PSCCH resources 515, DMRS resources 525, SCI-2 resources 530, and time-frequency resources for AGC symbols 520.

[0108] In some cases, the configuration for the S-SSB 505 may be based on one or more configurations for the PSCCH resources 515 and the DMRS resources 525. For example, the UE 115 may select a configuration for the S-SSB 505 to avoid overlap of the S-SSB 505 with the PSCCH resources 515 and the DMRS resources 525. In some cases, one or more S-SSB 505 configurations may be compatible with one or more configurations for the PSCCH resources 515 and the DMRS resources 525. Therefore, the UE 115 may send control information (e.g., an SCI-1 message) that may indicate a configuration for the PSCCH resources 515 and the DMRS resources 525 that is compatible with the configuration for the S-SSB 505. In some cases, the UE 115 may select a configuration for the PSCCH resources 515 and the DMRS resources 525 that may include multiple DMRSs, which may improve one or more conditions associated with high UE 115 mobility (e.g., more DMRSs may reduce or eliminate undesirable effects associated with Doppler shift).

[0109] In some cases, the configuration of the S-SSB 505 can be based on a certain number of DMRS resources 525. For example, if the DMRS resource 525 includes three symbols, the S-SSB 505 can be located between the DMRS resources 525. In some cases, the configuration for the S-SSB 505 can be based on the location of the DMRS resources 525. In some cases, the S-SSB 505 can be split. For example, the resources for the S-SSB 505 may not be continuous. In this case, one or more DMRS resources 525 can be located between one or more S-SSB 505 resources. Additionally or alternatively, the S-SSB 505 can include a symbol gap in the middle of the S-SSB 505.

[0110] In some cases, the UE 115 may perform an LBT procedure to access the BWP in the shared spectrum. The UE 115 may perform an LBT procedure before sending the S-SSB 505. For example, the UE 115 may perform an LBT procedure to reserve time-frequency resources for the S-SSB 505. In some cases, if the PSSCH resource 510 is empty (e.g., the PSSCH resource 510 does not include data), there may be a time-frequency resource gap (e.g., one or more null symbols) between the resources for the SCI (e.g., the SCI-2 resource 530) and the S-SSB 505, and the UE 115 may perform an additional LBT procedure for the S-SSB 505. In some cases, the UE 115 may rate match the SCI-2 resource 530 to fill the gap between the PSCCH resource 515 (e.g., the PSCCH resource 515, which may be empty) and the S-SSB 505. Therefore, UE 115 may not perform additional LBT procedures for S-SSB 505.

[0111] Figure 6 An example of a resource configuration 600 supporting an S-SSB design for shared spectrum in accordance with one or more aspects of the present disclosure is illustrated. The resource configuration 600 may be implemented by aspects of the wireless communication system 100 and the wireless communication system 300. For example, the resource configuration 600 may be implemented for sidelink communications by one or more UEs, such as described by the wireless communication system 300. The resource configuration 600 may support the use of an S-SSB waveform that may be multiplexed with the PSCCH / PSSCH in the same subchannel (e.g., a 20 MHz subchannel) in a timeslot, and the S-SSB waveform may not have an impact on PSCCH decoding, while also avoiding resources configured for DMRS and SCI (e.g., SCI-2).

[0112] Resource configuration 600 may include time-frequency resources for one or more transmission types. For example, resource configuration 600 may include time-frequency resources for S-SSB 605. In some cases, such as reference Figure 1 As described, UE 115 may transmit one or more S-SSBs 605. In some cases, resource configuration 600 may be a representation of a time-frequency resource, a transmission using the time-frequency resource, or both. For example, S-SSB 605 may be an example of a transmission or a time-frequency resource used for transmission.

[0113] In some cases, the UE 115 may not be able to effectively maintain phase continuity. For example, some UEs 115 may be associated with high transmit power variations. In some cases, the UE 115 may multiplex the S-SSB 605 with the PSSCH transmission, and the number of RBs may vary over time, which may have a negative impact on phase continuity. In some cases, the UE 115 may perform one or more operations to maintain phase continuity and limit transmit power variations. For example, the UE 115 may use an interlaced waveform design to send signaling to maintain phase continuity. In some cases, the UE 115 may communicate using interlaced PSSCH resources 610 and PSCCH resources 615. For example, the UE 115 may implement a fully interlaced waveform design.

[0114] As described herein, PSSCH resources 610, PSCCH resources 615, AGC symbols 620, or any combination thereof may be configured according to an interlaced waveform design. An interlaced waveform design may include multiple non-continuous RBs. Non-continuous RBs may be separated by empty frequency resources (e.g., empty RBs). In some cases, PSSCH resources 610 may be configured according to an interlaced waveform design. Similarly, PSCCH resources 615 and AGC symbols 620 may be configured according to an interlaced waveform design. In some cases, for a fully interlaced waveform design, a certain number of RBs may be occupied for OFDM symbols with and without S-SSB 605. Therefore, phase continuity may be maintained. In some cases, if UE 115 is able to maintain phase continuity, UE 115 may communicate using an interlaced subset.

[0115] In some cases, the total amount of occupied RBs may vary over time, which may result in reduced phase continuity. For example, a first number of symbols may include PSSCH signaling but may not include S-SSB 605. A second number of symbols may include PSSCH signaling and S-SSB 605. Thus, the second number of symbols may be associated with a higher transmit power than the first number of symbols. In order to improve phase continuity and reduce variations in transmit power, UE 115 may adjust the transmit power of one or more transmissions to maintain the total transmit power. For example, UE 115 may reduce the transmit power of PSSCH signaling corresponding to symbols that also include S-SSB 605.

[0116] UE 115 may adjust the transmit power for one or more transmissions by performing one or more operations. For example, UE 115 may perform one or more operations to increase the transmit power associated with one or more transmissions. In some cases, UE 115 may perform one or more operations to reduce the transmit power associated with one or more transmissions. Additionally or alternatively, UE 115 may set the transmit power for one or more transmissions to 0. In some cases, UE 115 may adjust the transmit power by performing one or more puncturing operations. In some cases, puncturing one or more resources may refer to one or more resources with zero transmit power. In some cases, UE 115 may puncture one or more PSSCH resources 610 that overlap with S-SSB 605 in time and power-boosted PSSCH signaling that does not overlap with S-SSB 605 to maintain the total transmit power on the time slot (e.g., the transmit power may not change over the duration of the time slot).

[0117] The UE 115 may determine to adjust the transmit power for one or more transmissions based on a certain number of interlaces. For example, the UE 115 may determine to adjust the transmit power for the PSSCH resource 610 based on a certain number of interlaces for one or more PSSCH resources 610. Additionally or alternatively, the UE 115 may determine to adjust the transmit power for one or more transmissions based on the location of the S-SSB 605. In some cases, if the configuration for the PSSCH resource 610 includes one or two interlaces, the UE 115 may truncate one or more PSSCH RBs that overlap in time with the S-SSB 605. Additionally or alternatively, the UE 115 may increase the transmit power (e.g., power boost) of one or more PSSCH resources 610 that do not overlap in time with the S-SSB 605. Therefore, by performing the operations described herein, the UE 115 can maintain a constant or nearly constant total transmit power over the duration of the time slot (e.g., 14 symbols of the time slot).

[0118] In some cases, the number of RBs used for the S-SSB 605 may be greater than the number of RBs used for the PSSCH resources 610 (e.g., if the configuration for the PSSCH resources 610 includes a single interlace). In some cases, the number of RBs used for the S-SSB 605 and the number of RBs used for the PSSCH resources 610 may be the same number. For example, the configuration for the PSSCH resources 610 may include two interlaces, and the configuration for the S-SSB 605 may include 20 RBs. In some cases, if the configuration for the PSSCH resources 610 includes more than two interlaces, the UE 115 may reduce the power associated with the PSSCH resources 610 that overlap in time with the S-SSB 605.

[0119] In some cases, if the PSSCH resource 610 is associated with quadrature phase shift keying (QPSK), a UE 115 receiving transmissions using the PSSCH resource 610 may not be able to determine that the power associated with the PSSCH resource 610 has been reduced. In some cases, the UE 115 may multiplex one or more PSSCH transmissions with the S-SSB 605, and the one or more PSSCH transmissions may include a discovery signal that may use QPSK to improve coverage. In some cases, if the UE 115 implements higher order modulation for the PSSCH resource 610, the UE 115 may calculate a transmit power reduction that may be associated with a resource allocation for the PSSCH resource 610. In some cases, the UE 115 may increase the transmit power associated with one or more PSSCH resources 610 based on the amount of transmit power not allocated to the S-SSB 605.

[0120] Figure 7 An example of a resource configuration 700 supporting an S-SSB design for shared spectrum in accordance with one or more aspects of the present disclosure is illustrated. The resource configuration 700 may be implemented by aspects of the wireless communication system 100 and the wireless communication system 300. For example, the resource configuration 700 may be implemented for sidelink communications by one or more UEs, such as described by the wireless communication system 300. The resource configuration 700 may support the use of an S-SSB waveform that may be multiplexed with the PSCCH / PSSCH in the same subchannel (e.g., a 20 MHz subchannel) in a timeslot, and the S-SSB waveform may not have an impact on PSCCH decoding, while also avoiding resources configured for DMRS and SCI (e.g., SCI-2).

[0121] Resource configuration 700 may include time-frequency resources for one or more transmission types. For example, resource configuration 700 may include time-frequency resources for S-SSB 705. In some cases, such as reference Figure 1 As described, UE 115 may transmit one or more S-SSBs 705. In some cases, resource configuration 700 may be a representation of a time-frequency resource, a transmission using a time-frequency resource, or both. For example, S-SSB 705 may be an example of a transmission or a time-frequency resource used for transmission.

[0122] In some cases, PSSCH resources 710, PSCCH resources 715, AGC symbols 720, DMRS resources 725, or any combination thereof may be configured according to an interlaced waveform design. An interlaced waveform design may include multiple non-continuous RBs. Non-continuous RBs may be separated by empty frequency resources (e.g., empty RBs). As described herein, AGC symbols 720 may not be configured according to an interlaced waveform design. However, PSSCH resources 710, PSCCH resources 715, and DMRS resources 725 may be configured according to an interlaced waveform design. In some cases, an interlaced waveform design may include one interlacing. In some other cases, an interlaced waveform design may include multiple interlacings.

[0123] As described herein, UE 115 may not be able to effectively maintain phase continuity or constant transmit power over the duration of a timeslot. For example, UE 115 may multiplex S-SSB 705 with PSSCH resources 710, which may increase the total transmit power during the symbol including S-SSB 705. Additionally or alternatively, the number of RBs may vary over the duration of a timeslot, which may have a negative impact on phase continuity. In some cases, UE 115 may perform one or more operations to maintain phase continuity and limit transmit power variations. For example, UE 115 may perform one or more rate matching operations around the symbol of S-SSB 705.

[0124] In some cases, the UE 115 may not multiplex the S-SSB 705 with one or more PSSCH resources 710 (e.g., one or more interleaved PSSCH resources 710). Therefore, in order to maintain a constant or nearly constant total transmit power over the duration of the time slot, the UE 115 may rate match around the S-SSB 705. Additionally or alternatively, the UE 115 may increase or decrease the transmit power of the PSSCH resources 710 to maintain a constant or nearly constant total transmit power over the duration of the time slot.

[0125] As described herein, UE 115 may use rate matching techniques. Rate matching may refer to matching the number of bits in a transport block (TB) from the MAC layer with the number of bits that can be sent in the allocated resources of a physical channel. For example, rate matching may include sub-block interleaving, bit collection, and puncturing. In some cases, a device may allocate resources for a channel that is excluded from rate matching or is not a part of the rate matching, which may be referred to as rate matching around resources in some cases. For example, UE 115 may configure resources to remain empty when matching the information rate to a channel. In some cases, empty resources may have zero transmit power. These empty resources may be referred to as rate-matched resources, rate-matched resources, rate-matched resource elements (REs), rate-matched REs, or some other term. Resources with zero transmit power may be referred to as punctured resources.

[0126] Figure 8 An example of a resource configuration 800 supporting an S-SSB design for shared spectrum in accordance with one or more aspects of the present disclosure is illustrated. The resource configuration 800 may be implemented by aspects of the wireless communication system 300 and the wireless communication system 100. For example, the resource configuration 800 may be implemented for sidelink communications by one or more UEs, such as described by the wireless communication system 300. The resource configuration 800 may support the use of an S-SSB waveform that may be multiplexed with the PSCCH / PSSCH in the same subchannel (e.g., a 20 MHz subchannel) in a timeslot, and the S-SSB waveform may not have an impact on PSCCH decoding, while also avoiding resources configured for DMRS and SCI (e.g., SCI-2).

[0127] Resource configuration 800 may include time-frequency resources for one or more transmission types. For example, resource configuration 800 may include time-frequency resources for S-SSB 805. In some cases, such as reference Figure 1 As described, UE 115 may transmit one or more S-SSBs 805. In some cases, resource configuration 800 may be a representation of a time-frequency resource, a transmission using a time-frequency resource, or both. For example, S-SSB 805 may be an example of a transmission or a time-frequency resource used for transmission.

[0128] In some cases, PSSCH resources 810, PSCCH resources 815, AGC symbols 820, DMRS resources 825, or any combination thereof may be configured according to an interlaced waveform design. An interlaced waveform design may include multiple non-continuous RBs. Non-continuous RBs may be separated by empty frequency resources (e.g., empty RBs). As described herein, AGC symbols 820 may not be configured according to an interlaced waveform design. However, PSSCH resources 810, PSCCH resources 815, and DMRS resources 825 may be configured according to an interlaced waveform design. In some cases, an interlaced waveform design may include one interlacing. In some other cases, an interlaced waveform design may include multiple interlacings.

[0129] As described herein, the UE 115 may not be able to effectively maintain phase continuity or constant transmit power over the duration of a timeslot. For example, the UE 115 may multiplex the S-SSB 805 with the PSSCH resource 810, which may increase the total transmit power during the symbol including the S-SSB 805. Additionally or alternatively, the number of RBs may vary over the duration of the timeslot, which may have a negative impact on phase continuity. In some cases, the UE 115 may perform one or more operations to maintain phase continuity and limit transmit power variations. For example, the UE 115 may perform one or more rate matching operations around the symbol of the S-SSB 805. However, in some cases, one or more symbols after the S-SSB 805 may be empty. For example, one or more symbols after the S-SSB 805 may not include the PSSCH resource 810 or the DMRS resource 825.

[0130] In some cases, the UE 115 may not multiplex the S-SSB 805 with one or more PSSCH resources 810 (e.g., one or more interleaved PSSCH resources 810). Therefore, in order to maintain a constant or nearly constant total transmit power over the duration of the time slot, the UE 115 may rate match around the S-SSB 805. Additionally or alternatively, the UE 115 may increase or decrease the transmit power of the PSSCH resources 810 to maintain a constant or nearly constant total transmit power over the duration of the time slot.

[0131] As described herein, UE 115 may use rate matching techniques. Rate matching may refer to matching the number of bits in the TB from the MAC layer with the number of bits that can be sent in the allocated resources of the physical channel. For example, rate matching may include sub-block interleaving, bit collection, and puncturing. In some cases, a device may allocate resources of a channel that is excluded from rate matching or is not a part of the rate matching, which may be referred to as rate matching around resources in some cases. For example, UE 115 may configure resources to remain empty when matching the information rate to the channel. In some cases, empty resources may have zero transmit power. These empty resources may be referred to as rate-matched resources, rate-matched resources, rate-matched REs, rate-matched REs, or other terms. Resources with zero transmit power may be referred to as puncturing resources.

[0132] In some cases, the UE 115 may configure a shortened waveform for the S-SSB 805. The shortened waveform may not include the PSSCH resource 810 or the DMRS resource 825 that is sequentially after the S-SSB 805. For example, one or more symbols before the S-SSB 805 may include the PSSCH resource 810 and the DMRS resource 825, however, one or more symbols after the S-SSB 805 may not include the PSSCH resource 810 and the DMRS resource 825. In some cases, the UE 115 may configure the waveform for the S-SSB 805 based on the size of the transport block. For example, if the transport block size is small, the UE 115 may determine to use a shortened waveform to send one or more S-SSBs 805. In some cases, the SCI (e.g., SCI-1) may indicate whether the UE 115 implements the shortened waveform. For example, the UE 115 may send an SCI-1 message that may indicate the PSSCH resources 810 that occur before the S-SSB 805 is rate matched. In some cases (e.g., for waveform configurations that do not include full interleaving), the frequency domain resource allocation (FDRA) may implicitly indicate that the UE 115 may implement a shortened waveform.

[0133] In some aspects, the UE may be configured with SL SSB resources that may not be multiplexed with other signals and / or SL data. For example, the UE may be configured with multiple S-SSB time slots for sending one or more S-SSBs in a shared frequency band. In addition, the UE may be configured with a set of frequency resources for sending one or more S-SSBs within one or more time slots. In some aspects, the frequency resources allocated for S-SSB may not meet one or more channel occupancy thresholds or requirements of the shared frequency band. For example, in some aspects, the frequency resources allocated for S-SSB may be equal to or less than the 2MHz threshold. The 2MHz threshold may be associated with the channel occupancy requirements for communications in the shared frequency band. In some aspects, the bandwidth of the S-SSB resource may be based in part on the subcarrier spacing (SCS) of the frequency band allocated for SL communication. In another example, the frequency resources used for S-SSB communication may not meet the occupied channel bandwidth threshold of 80% of the total allocated bandwidth. However, it may be impractical or undesirable to multiplex S-SSB with other SL communications in the frequency domain. The present disclosure describes systems, schemes, and mechanisms for transmitting SL synchronous communications in a shared frequency band. Aspects of the present disclosure may increase the occupied bandwidth of SL synchronous communications relative to the configured or allocated frequency resources for SL synchronous communications.

[0134] Fig. 9 An example of a process flow 900 in a system supporting S-SSB design for shared spectrum according to one or more aspects of the present disclosure is illustrated. In some examples, the process flow 900 can implement aspects of the wireless communication system 100 and the wireless communication system 300. For example, the process flow 900 can include UE 115-d and UE 115-e, which can be as described in reference Figure 1 and Figure 3 An example of a corresponding UE 115 described. The process flow 900 may also include a network device or network entity 105. In some aspects, the network entity 105 may include a base station (BS). The BS may be a clustered BS or a decomposed BS. For example, UE 115-D, 115-E may be configured to operate using SL resource allocation mode 1, where the network provides SL resource assignments or resource pools via the network entity 105. In another example, UE 115-D, 115-E may be configured to operate using resource allocation mode 2, where the UE 115 may determine or select SL resources for communication. In some cases, the process flow 900 may implement aspects of the above-described resource configurations 400, 500, 600, 700, and 800. In addition, aspects of the process flow 900 are Figures 10 to 12C Furthermore, it will be appreciated that process flow 900 may involve or incorporate a combination of aspects of resource configurations 400 to 800 and resource configurations 1000 to 1200c.

[0135] In the following description of process flow 900, operations between network entity 105, UE 115-D, and UE 115-E may be sent in a different order than shown, or may be performed at different times. Some operations may also be excluded from process flow 900, or other operations may be added to process flow 900. Although UE 115 is shown as performing multiple operations of process flow 900, any wireless device may perform the operations shown.

[0136] At 905, the network entity 105 sends a SL resource pool configuration, and the UE 115-d may receive the SL resource pool configuration. In some aspects, the resource pool configuration may indicate SL resources in a shared frequency band. The SL resource pool may be associated with a first SCS. In some aspects, receiving a second configuration may include receiving an SL-ResourcePoolIE. For example, the SL resource pool may include time and frequency resources for SL data, SL control information, SL feedback information, and / or SL reference signals. In some aspects, the SL resource pool may include physical sidelink control channel (PSCCH) resources, physical sidelink shared channel (PSSCH) resources, physical sidelink feedback channel (PSFCH) resources, and / or any other suitable resources. For example, as Figure 7 and Figure 8 As shown, the SL resource pool may include a subset of resources allocated for at least one S-SSB candidate. Therefore, the resources allocated for SL synchronous communication may include a combination of S-SSB time slots and SL resource pool resources.

[0137] In some aspects, the SL-ResourcePool IE may indicate the SL synchronization resource configuration described below. The SL resource pool may include a bandwidth in a shared frequency band. For example, the bandwidth indicated in the SL resource pool may include multiple RBs, such as, for example, 11 RBs, 18 RBs, 24 RBs, 25 RBs, 38 RBs, 51 RBs, 52 RBs, 65 RBs, 106 RBs and / or any other suitable number of RBs. The bandwidth of the SL resource may be 5 MHz, 10 MHz, 15 MHz, 20 MHz, 25 MHz, 30 MHz, 40 MHz, 50 MHz, 60 MHz, 80 MHz, 100 MHz and / or any other suitable bandwidth. In some aspects, the SCS may be based on the frequency range of the SL resource pool.

[0138] At 910, the network entity 105 sends an S-SSB configuration, and the UE 115-D receives the S-SSB configuration. In some aspects, receiving the S-SSB configuration may include receiving one or more radio resource control (RRC) messages or information elements indicating one or more parameters for the S-SSB resource. In some aspects, the S-SSB resource may include a time-frequency resource for sending one or more S-SSBs. In some aspects, the S-SSB resource may include one or more time slots and / or one or more symbols in the time domain. In some aspects, the S-SSB resource may include one or more SL synchronization communication candidates or instances. For example, the UE115 device may be configured to select at least one S-SSB candidate from a plurality of configured candidates for communicating at least one S-SSB. In some aspects, the SL synchronization communication resource includes at least one time slot, which includes 14 symbols. In some aspects, the at least one time slot may include a plurality of symbols allocated to a physical broadcast channel (PBCH) signal, two or more symbols allocated to a primary synchronization signal (PSS), and two or more symbols allocated to a secondary synchronization signal (SSS). The last symbol may be a gap symbol. In this regard, SL synchronization resources can be used with Fig.11A The resources illustrated in are similar or identical.

[0139] On the other hand, the S-SSB resource may include at least one time slot that includes a first S-SSB candidate and a second S-SSB candidate. In some aspects, each of the S-SSB candidates includes four consecutive symbols. In some aspects, the first symbol of each candidate is allocated for a sidelink primary synchronization signal (S-PSS), the second symbol and the fourth symbol are allocated for a physical sidelink broadcast channel (PSBCH) signal, and the third symbol is allocated for a combination of a sidelink secondary synchronization signal (S-SSS) and a PSBCH signal. In this regard, the SL synchronization communication resource may be associated with Fig. 11B The resources illustrated in are similar or identical.

[0140] In another aspect, receiving the S-SSB configuration may include receiving a SL-SyncConfig IE indicating timing parameters associated with communication of the S-SSB.

[0141] In some aspects, the S-SSB resources may occupy a first portion of the shared frequency band. For example, the S-SSB resources may occupy 11 resource blocks (RBs) of the shared frequency band. In some aspects, the shared frequency band is approximately 20 MHz. However, the present disclosure also contemplates other bandwidths for the shared frequency band, including 10 MHz, 15 MHz, 25 MHz, 30 MHz, and / or any other suitable value greater or less. On the other hand, the S-SSB resources may occupy 11 RBs for the S-PSS and 20 RBs for the S-SSS and PSBCH. On the other hand, the S-SSB resources may include a subset of resources from the SL resource pool.

[0142] In some aspects, the first portion of the shared frequency band allocated to S-SSB can be lower than the network specification or requirement. For example, in some instances, the frequency resources allocated for S-SSB can be lower than 2 MHz. In some aspects, the bandwidth occupied by the S-SSB can be based on the subcarrier spacing (SCS) used for communication. In some aspects, the SCS may also be referred to as a parameter set. For example, if the S-SSB resources include 11 RBs and the UE 115-D is configured to communicate using an SCS of 15 kHz, the bandwidth of the S-SSB using the SCS of 15 kHz can be lower than the 2 MHz threshold. In other aspects, for a given SCS, the S-SSB resources may exceed 2 MHz, but may be lower than an occupied channel bandwidth (OCB) threshold of 80%.

[0143] At 915, UE 115-d may perform a channel access procedure to obtain access to a bandwidth portion in a shared spectrum for sidelink communications with UE 115-e. For example, UE 115-d may perform an LBT procedure. In some cases, UE 115-d may perform a channel access procedure and establish one or more communication links with UE 115-e based on performing the channel access procedure. For example, UE 115-d may reserve a channel for communicating with UE 115-e. In some cases, UE 115-e may perform a channel access procedure to obtain access to a bandwidth portion in a shared spectrum for sidelink communications with UE 115-d.

[0144] At 920, the UE 115-d may send an SCI message via the PSCCH, the SCI message indicating which subbands of the one or more subbands include one or more S-SSBs. In some cases, the SCI message includes a bitmap indicating which of the one or more subbands includes the one or more S-SSBs. In some cases, the SCI message includes a subband index field indicating which subband of the one or more subbands includes the one or more S-SSBs. The SCI message may be sent within a subband of the one or more subbands. The SCI message may include a bit indicating that one or more S-SSBs are sent in a subband. In some cases, one or more S-SSBs may be sent in at least two subbands of the one or more subbands. In some cases, based on the UE 115-d performing one or more rate matching operations associated with the SCI message, the SCI message may fill a resource gap between resources used for the PSCCH and the one or more S-SSBs.

[0145] At 925, UE 115-D may rate match one or more S-SSBs for transmission to UE 115-E. The S-SSBs may be rate matched to occupy a second portion of the shared frequency band. In some aspects, the second portion of the shared frequency band is greater than and includes the first portion of the shared frequency band. In some aspects, the rate matched S-SSBs include or result in frequency filling S-SSBs such that additional RBs and / or REs in the frequency domain are occupied by the S-SSBs.

[0146] In another aspect, the S-SSB resource includes a time slot and a first number of RBs, such as 11 RBs and / or 20 RBs as described above. In another aspect, a first number of RBs may be allocated for PBCH signals, PSS signals, and SSS signals. In some aspects, rate-matched S-SSB may include rate-matched SL synchronization to occupy a second number of RBs that is greater than the first number of RBs. For example, UE 115-D may at least rate-match PBCH to occupy 20 RBs, or more than 20 RBs. In some aspects, the second number of RBs may satisfy one or more channel occupancy thresholds and / or requirements.

[0147] At 930, UE 115-D may determine or select an S-SSB candidate from a plurality of S-SSB candidates. For example, an S-SSB resource may include one or more S-SSB candidates, each S-SSB candidate having a plurality of consecutive symbols in the time domain. In one example, each S-SSB time slot may include a first S-SSB candidate and a second S-SSB candidate, such as Fig. 12A In another aspect, each time slot may include three or more SL synchronization candidate locations, such as Fig. 12BIn another aspect, the SL synchronization communication resource may include a plurality of time slots, including a first time slot that is consecutive to a second time slot. At least one of the SL synchronization candidate positions may include a portion of the first time slot (e.g., one or more symbols) and a portion of the second time slot (e.g., one or more other symbols). In other words, the SL synchronization communication resource may include one or more SL synchronization candidate positions located across time slots, such as Fig. 12C In another aspect, the SL resource pool may include one or more S-SSB candidate location allocations, for example, Figure 7 and Figure 8 By including additional S-SSB candidate locations in the S-SSB resource, overhead may be reduced. The UE 115-D may select one or more of the candidate locations to transmit one or more S-SSBs.

[0148] At 935, UE 115-D transmits one or more S-SSBs, and UE 115-E receives one or more S-SSBs. In some aspects, action 935 includes transmitting the one or more S-SSBs based on the rate matching of action 925 such that the one or more S-SSBs occupy a larger second portion of the shared frequency band, e.g., Fig.11A and Fig. 11B In other aspects, UE 115-D may send an S-SSB based on a second SCS greater than a first SCS associated with the SL resource pool, e.g., Fig.10 As illustrated in . In one example, the SL resource pool may be associated with an SCS of 15 kHz, and the sending of one or more S-SSBs may be based on an SCS of 30 kHz, 60 kHz, 120 kHz, and / or any other suitable parameter set. Therefore, the bandwidth of the SL communication sent in the SL resource pool may be based on a 15 kHz parameter set, and the bandwidth of the S-SSB may be based on an SCS of 30 kHz, an SCS of 60 kHz, an SCS of 120 kHz, and / or any other suitable SCS greater than the first SCS. In another example, the SL resource pool may be associated with an SCS of 30 kHz, and one or more S-SSBs may be sent using an SCS of 60 kHz, an SCS of 120 kHz, and / or any other suitable SCS.

[0149] In other aspects, the second SCS may be the same as the first SCS used to send SL data in the SL resource pool. For example, the UE 115-D may be configured with a fixed SCS or parameter set for one or more S-SSBs. In some aspects, the UE 115-D may be configured with a fixed minimum SCS or parameter set for one or more S-SSBs, so that the SCS used for the S-SSB may vary with the configured SL resource pool, but is not allowed to be lower than the minimum fixed SCS. In some aspects, the fixed SCS or the minimum fixed SCS may be 30kHz, 60kHz, 120kHz, or any other suitable SCS. In one example, if the SL resource pool is configured with an SCS of 15kHz or an SCS of 30kHz, the UE 115-D may be configured to use an SCS of 30kHz. If the SL resource pool is configured with an SCS of 60kHz, the second SCS may be increased to 60kHz with the SL resource pool. Other examples are also contemplated in the present disclosure.

[0150] In some aspects, sending an S-SSB may include sending, in one of the first S-SSB candidate or the second S-SSB candidate: a PSS that occupies a second number of RBs, and a PBCH signal that is rate matched to occupy a third number of RBs that is greater than the first number of RBs. In some aspects, the third number of RBs may satisfy one or more channel occupancy thresholds and / or requirements. For example, in some aspects, the first number of RBs may occupy less than 2 MHz. In some aspects, rate-matched SL synchronization with the third number of RBs may occupy more than 2 MHz. In another example, for at least one SCS, the first number of RBs may not satisfy an OCB threshold of 80%. The second number of RBs may be at, close to, or above an OCB threshold of 80%.

[0151] At 940, the UE 115-E may decode the one or more S-SSBs based on receiving the signal. In some cases, the UE 115-E may receive an SCI message from the UE 115-D. The SCI message may include a bitmap indicating which of the one or more subbands includes the one or more S-SSBs. The SCI message may include a subband index field indicating which of the one or more subbands includes the one or more S-SSBs. In some cases, the UE 115-E may perform one or more operations to decode the one or more S-SSBs.

[0152] As described above, the S-SSB resources indicated in the first configuration may include one or more time slots allocated for one or more S-SSBs. On the other hand, the S-SSB resources may include resources in a SL resource pool, such that the SL resource pool includes SL data resources and S-SSB resources. In some aspects, the S-SSB resources include a combination of S-SSB time slots and S-SSB resources in the SL resource pool. In some aspects, the process flow 900 may also include UE 115-D receiving a signal that activates: one or more time slots allocated to one or more S-SSBs; additional S-SSB resources and SL data resources; or a combination thereof. In some aspects, receiving the signal may include receiving the first configuration. For example, the first configuration may include a field, parameter, value, or other indicator indicating a trigger for activating the above-mentioned S-SSB resources.

[0153] Fig.10 A diagram of a resource configuration 1000 for SL communication in a shared frequency band is shown. As described above, the UE may be configured with a SL resource pool and / or one or more S-SSB resources. In configuration 1000, the UE is configured with a PSSCH resource 1010, wherein the PSSCH resource 1010 is associated with a first SCS 1002. The first SCS may be based on a carrier and / or BWP allocated to the PSSCH 1010. For example, the first SCS may be 15kHz, 30kHz, 60kHz, 120kHz, and / or any other suitable parameter set. The bandwidth occupied by the PSSCH resource 1010 may be based on the first SCS 1002. For example, the PSSCH resource 1010 may include multiple RBs, each of which includes multiple subcarriers. Because the size of the subcarriers in the frequency domain is based on the first SCS 1002, the bandwidth of the RBs of the PSSCH resource 1010 may also be based on the first SCS 1002.

[0154] In some aspects, the UE may be configured to communicate the S-SSB using the same SCS configured for the PSSCH resource 1010. According to various aspects of the present disclosure, the UE may be configured with a fixed and / or minimum fixed SCS for communicating the S-SSB in the shared frequency band. In this regard, according to the resource configuration 1000, the UE may be configured with a fixed and / or minimum fixed SCS 1004 that is greater than the first SCS 1002. For example, the SCS 1002 may be 15kHz, and the fixed SCS 1004 may be 30kHz, 60kHz, 120kHz, and / or any other suitable parameter set. A larger fixed SCS 1004 may cause the S-SSB 1012 to occupy a larger amount of the shared frequency band. In this regard, the S-SSB 1012 may occupy a first portion 1006 of the shared frequency band using the fixed SCS 1004, wherein if the S-SSB 1012 is based on the first SCS 1002, the S-SSB 1012 will have occupied a smaller second portion 1007 of the shared frequency band. Thus, the UE may increase the occupied channel bandwidth (OCB) of the S-SSB 1012 in the shared frequency band by increasing the SCS for the S-SSB. In some aspects, the SCS for the S-SSB may be a fixed value for all frequency bands, such that the SCS for the S-SSB 1012 may not depend on the SCS 1002 of the SL data resources (e.g., PSSCH, PSCCH, PSFCH). In other aspects, the SCS 1004 for the S-SSB may be a minimum SCS value, such that if the SCS 1002 for the SL resource pool increases above the minimum SCS value, the SCS 1004 for the S-SSB may increase.

[0155] Fig.11A and Fig. 11B 1 is a diagram illustrating S-SSB resource configurations 1100, 1120 according to various aspects of the present disclosure. In particular, Fig.11A and Fig. 11B An S-SSB resource configuration is illustrated that includes or involves rate matching one or more portions of the S-SSB to occupy a larger portion of the allocated bandwidth. Fig.11AA first S-SSB resource allocation configuration 1100 is illustrated, wherein the S-SSB occupies an S-SSB time slot. The S-SSB time slot 1108 includes a plurality of symbols 1101. In addition, the resource allocation configuration 1100 includes a bandwidth 1104, which is a portion of an allocated frequency band 1102 associated with an SL resource pool. The symbols 1101 of the time slot 1108 may be allocated to a portion of the S-SSB. For example, symbols indexed 0 and 5-12 may be allocated to the PBCH 1112. In some aspects, the PBCH may be referred to as a PSBCH. Symbols indexed 1-2 may be allocated to the S-PSS 1114. Symbols indexed 3-4 may be allocated to the S-SSS 1116. The final symbol indexed 13 may be a gap symbol 1119 or a guard symbol. Configuration 1100 may allocate 11 RBs for the PBCH 1112, the S-PSS 1114, and the S-SSS 1116. According to Fig.11A In the resource allocation configuration 1100, the UE may rate match at least a portion of the S-SSB to occupy a portion 1106 of the total bandwidth 1102, which may be greater than the portion 1104 allocated for the S-SSB. In some aspects, the UE may rate match the PBCH 1112 and the S-SSS 1116 to include a rate matched (RM) portion 1118, such as Fig.11A In other aspects, the UE may rate match only the PBCH 1112. In another aspect, the UE may rate match the PBCH 1112, the S-PSS 1114, and the S-SSS 1116. In some aspects, rate matching the S-SSB according to the configuration 1100 may allow the S-SSB to meet one or more channel occupancy requirements and / or thresholds.

[0156] refer to Fig. 11B , a second resource allocation configuration 1120 is provided. In the second resource allocation configuration 1120, the UE may be configured with multiple S-SSB candidates, where each S-SSB candidate includes a time domain allocation 1109 of four consecutive symbols. Similar to configuration 1100, configuration 1120 may include allocations for PBCH 1112, S-PSS 1114, and S-SSS 1116. In some aspects, configuration 1120 may include 11 RBs for S-PSS 1114, and 20 RBs 1105 for PBCH 1112 and S-SSS 1116. According to configuration 1120, the UE may rate match the PBCH 1112 and S-SSS 1116 to include a RM portion 1118. The RM portion 1118 may cause the S-SSB to occupy a larger portion 1106 of the total bandwidth.

[0157] FIG. 12A to FIG. 12C1 is a diagram illustrating an S-SSB candidate configuration 1200 according to various aspects of the present disclosure. Aspects of configuration 1200 may be used in conjunction with process flow 900. In some aspects, configuration 1200 may provide multiple S-SSB candidate locations to reduce overhead and reduce the number of S-SSB slots allocated to SL UEs. Fig. 12A , the S-SSB candidate configuration 1200a includes a first S-SSB candidate 1204 and a second S-SSB candidate 1206 in a time slot 1202. In some aspects, the UE may receive an S-SSB configuration indicating a starting symbol and / or a symbol length of the S-SSB candidates 1204, 1206. The time slot 1202 includes a plurality of symbols 1201, and each candidate occupies four symbols. In some aspects, each candidate 1204, 1206 may have a Fig. 11B . For example, each candidate 1204, 1206 may include 11 RBs allocated to the S-PSS and 20 RBs allocated to the PBCH and S-SSS. However, other frequency allocations and symbol allocations are also contemplated by the present disclosure. Fig. 12B , a second S-SSB candidate configuration 1200b is shown, where the S-SSB slot 1202 includes three S-SSB candidates 1204, 1206, and 1208. In the illustrated example, the S-SSB candidates are contiguous. However, it will be appreciated that in other aspects, one or more of the S-SSB candidates may not be contiguous with at least one other S-SSB candidate in the slot 1202.

[0158] refer to Fig. 12C , a third S-SSB candidate configuration 1200c is shown, in which multiple S-SSB candidates 1204, 1206, 1208, 1210, 1212, 1214, 1216 are distributed across the first S-SSB slot 1202 and the second S-SSB slot 1203. As described above, each candidate may include four symbols in the time domain. In configuration 1200c, the fourth S-SSB candidate 1210 includes a first portion of two symbols in the first slot 1202 and a second portion of two symbols in the second slot 1203. Thus, in some aspects, an S-SSB configuration may be provided to the UE, in which multiple S-SSB candidate positions are provided over multiple slots. In addition, at least one S-SSB candidate may extend across two slots. In some aspects, at least one S-SSB candidate may be evenly divided between the two slots. In other aspects, at least one S-SSB candidate may be unevenly divided between the two slots.

[0159] Fig.13 1 is a block diagram of an exemplary UE 1300 according to some aspects of the present disclosure. UE 1300 may be the above Figure 113. As shown, UE 1300 may include a processor 1302, a memory 1304, a sidelink communication module 1308, a transceiver 1310 (which includes a modem subsystem 1312 and a radio frequency (RF) unit 1314), and one or more antennas 1316. These elements may communicate with each other directly or indirectly, for example, via one or more buses.

[0160] The processor 1302 may include a central processing unit (CPU), a digital signal processor (DSP), an application specific integrated circuit (ASIC), a controller, a field programmable gate array (FPGA) device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein. The processor 1302 may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0161] Memory 1304 may include cache memory (e.g., cache memory of processor 1302), random access memory (RAM), magnetoresistive RAM (MRAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), flash memory, solid-state memory devices, hard drives, other forms of volatile and non-volatile memory, or a combination of different types of memory. In one aspect, memory 1304 includes a non-transitory computer-readable medium. Memory 1304 may store or have recorded thereon instructions 1306. Instructions 1306 may include instructions that, when executed by processor 1302, cause processor 1302 to perform the various aspects of the present disclosure described herein (e.g., Figures 1 to 12C Instructions 1306 may also be referred to as program code. The program code may be used to cause the wireless communication device to perform the operations, for example, by causing one or more processors (such as processor 1302) to control or command the wireless communication device to do so. The terms "instructions" and "code" should be broadly interpreted to include any type of computer-readable statements. For example, the terms "instructions" and "code" may refer to one or more programs, routines, subroutines, functions, procedures, etc. "Instructions" and "code" may include a single computer-readable statement or many computer-readable statements.

[0162] The sidelink communication module 1308 may be implemented via hardware, software, or a combination thereof. For example, the sidelink communication module 1308 may be implemented as a processor, circuit, and / or instructions 1306 stored in the memory 1304 and executed by the processor 1302. In some examples, the sidelink communication module 1308 may be integrated into the modem subsystem 1312. For example, the sidelink communication module 1308 may be implemented by a combination of software components (e.g., executed by a DSP or general purpose processor) and hardware components (e.g., logic gates and circuits) within the modem subsystem 1312.

[0163] The sidelink communication module 1308 may be used in various aspects of the present disclosure, for example, Figures 1 to 12C Aspects of the invention. The sidelink communication module 1308 may be configured to receive a first configuration indicating a SL synchronous communication resource and to receive a second configuration indicating a SL resource pool. In some aspects, the SL resource pool may be associated with a first SCS. In some aspects, receiving the first configuration may include receiving one or more radio resource control (RRC) messages or information elements indicating one or more parameters for the SL synchronous communication resource. In some aspects, the SL synchronous communication resource may include a time-frequency resource for conveying a SL synchronization signal block (S-SSB). In some aspects, the SL synchronous communication resource may include one or more time slots and / or one or more symbols in the time domain. In some aspects, the SL synchronous communication resource may include one or more SL synchronous communication candidates or instances. For example, the sidelink communication module 1308 may be configured to select at least one S-SSB candidate from a plurality of configured candidates for conveying at least one S-SSB. In some aspects, the SL synchronous communication resource includes at least one time slot including 14 symbols. In some aspects, the at least one time slot may include a plurality of symbols allocated to a physical broadcast channel (PBCH) signal, two or more symbols allocated to a primary synchronization signal (PSS), and two or more symbols allocated to a secondary synchronization signal (SSS). The last symbol may be a gap symbol. In this regard, the SL synchronization resource may be the same as Fig.11A The resources illustrated in are similar or identical.

[0164] In another aspect, the SL synchronization communication resource may include at least one time slot including a first SSB candidate and a second SSB candidate. In some aspects, each S-SSB candidate in the SSB candidates includes four consecutive symbols. In some aspects, the first symbol of each candidate is allocated for the PSS, the second symbol and the fourth symbol are allocated for the PBCH signal, and the third symbol is allocated for the combination of the SSS and the PBCH signal. In this regard, the SL synchronization communication resource may be related to Fig. 11B The resources illustrated in are similar or identical.

[0165] In some aspects, the sidelink communication module 1308 may be configured to receive a SL resource allocation configuration from a network entity. The network entity may include a BS, such as one of BS 140 and / or network entity 1400. The SL resource allocation may be indicated in a SL BWP configuration provided by an RRC IE. For example, the SL synchronization communication configuration may be indicated in a SL-ResourcePool IE. On the other hand, receiving the SL synchronization communication may include receiving a SL-SyncConfig IE indicating timing parameters associated with communication of the S-SSB.

[0166] In some aspects, the sidelink communication module 1308 can be configured to receive a second configuration indicating a SL resource pool. For example, the SL resource pool can include time and frequency resources for SL data, SL control information, SL feedback information, and / or SL reference signals. In some aspects, the SL resource pool can include physical sidelink control channel (PSCCH) resources, physical sidelink shared channel (PSSCH) resources, physical sidelink feedback channel (PSFCH) resources, and / or any other suitable resources. For example, Figure 7 and Figure 8 As shown, the SL resource pool may include a subset of resources allocated for at least one S-SSB candidate. In some aspects, the resources allocated for SL synchronous communication may include a combination of S-SSB time slots and SL resource pool resources.

[0167] In some aspects, the sidelink communication module 1308 can be configured to send SL synchronous communications based on a second SCS that is greater than the first SCS. For example, the sidelink communication module 1308 can be configured to apply a fixed SCS and / or a fixed minimum SCS to the SL synchronous communications, so that the portion of the SL bandwidth occupied by the SL synchronous communications is larger than the portion of the SL bandwidth occupied using the first SCS. In some aspects, the sidelink communication module 1308 is also configured to send SL communications based on the first SCS.

[0168] According to another aspect of the present disclosure, the side link communication module 1308 may be configured to receive a first configuration indicating a side link (SL) synchronous communication resource. In some aspects, the SL synchronous communication resource includes a first portion of a shared frequency band. The first portion of the shared frequency band may include multiple RBs. On the other hand, the side link communication module 1308 may be configured to send SL synchronous communication that is rate matched to occupy a second portion of the shared frequency band based on the first configuration. In some aspects, the second portion of the shared frequency band is larger than the first portion of the shared frequency band and includes the first portion of the shared frequency band. In some aspects, the rate-matched SL synchronous communication includes or causes frequency filling of the SL synchronous communication so that the SL synchronous communication occupies additional RBs and / or REs in the frequency domain.

[0169] As shown, the transceiver 1310 may include a modem subsystem 1312 and an RF unit 1314. The transceiver 1310 may be configured to communicate bidirectionally with other devices, such as the BS 105. The modem subsystem 1312 may be configured to modulate and / or encode data from the memory 1304 and / or the sidelink communication module 1308 according to a modulation and coding scheme (MCS) (e.g., a low-density parity check (LDPC) decoding scheme, a turbo decoding scheme, a convolutional decoding scheme, a digital beamforming scheme, etc.). The RF unit 1314 may be configured to process (e.g., perform analog-to-digital conversion or digital-to-analog conversion, etc.) the modulated / encoded data (e.g., PSSCH data, PSSCH control information, and / or PSFCH data) from the modem subsystem 1312 (for outbound transmissions) or from another source, such as the UE 115 or the network entity 105. The RF unit 1314 may also be configured to perform analog beamforming in conjunction with digital beamforming. Although shown as being integrated together in the transceiver 1310, the modem subsystem 1312 and the RF unit 1314 may be separate devices that are coupled together at the UE 115 to enable the UE 115 to communicate with other devices.

[0170] The RF unit 1314 can provide the modulated and / or processed data, for example, a data packet (or more generally, a data message that can include one or more data packets and other information) to the antenna 1316 for transmission to one or more other devices. The antenna 1316 can further receive data messages sent from other devices. The antenna 1316 can provide the received data message for processing and / or demodulation at the transceiver 1310. The transceiver 1310 can provide the demodulated and decoded information (e.g., frequency interleaving configuration, PSSCH data, PSCCH control information, and / or PSFCH information) to the side link communication module 1308 for processing. The antenna 1316 can include multiple antennas of similar or different designs to maintain multiple transmission links. The RF unit 1314 can configure the antenna 1316.

[0171] In one example, the transceiver 1310 is configured to receive SL resource allocation and / or configuration indicating SL resource pool and / or SL synchronous communication resources from a BS (e.g., BS 140). The transceiver 1310 may also be configured to send SL communication (e.g., PSSCH data, SCI) and SL synchronous communication based on these configurations and by coordinating with the sidelink communication module 1308.

[0172] In one aspect, the UE 1300 may include multiple transceivers 1310 that implement different RATs (e.g., NR and LTE). In one aspect, the UE 1300 may include a single transceiver 1310 that implements multiple RATs (e.g., NR and LTE). In one aspect, the transceiver 1310 may include various components, where different combinations of components may implement different RATs.

[0173] Fig.14 is a block diagram of an exemplary network entity 1400 according to some aspects of the present disclosure. The network entity 1400 may be as described above in Figure 1 14. In some aspects, the network entity 1400 may include a clustered BS and / or a decomposed BS. As shown, the network entity 1400 may include a processor 1402, a memory 1404, a sidelink communication module 1408, a transceiver 1410 (which includes a modem subsystem 1412 and an RF unit 1414), and one or more antennas 1416. These elements may communicate with each other directly or indirectly, for example, via one or more buses.

[0174] The processor 1402 may have various features as a particular type of processor. For example, these features may include a CPU, a DSP, an ASIC, a controller, an FPGA device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein. The processor 1402 may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0175] Memory 1404 may include cache memory (e.g., cache memory of processor 1402), RAM, MRAM, ROM, PROM, EPROM, EEPROM, flash memory, solid-state memory devices, one or more hard disk drives, memristor-based arrays, other forms of volatile and non-volatile memory, or a combination of different types of memory. In some aspects, memory 1404 may include non-transitory computer-readable media. Memory 1404 may store instructions 1406. Instructions 1406 may include instructions that, when executed by processor 1402, cause processor 1402 to perform the operations described herein (e.g., Figures 1 to 12C Instructions 1406 may also be referred to as code, which may be broadly interpreted to include any type of computer-readable statements, such as those described above with respect to Fig.13 discussed.

[0176] The sidelink communication module 1408 may be implemented via hardware, software, or a combination thereof. For example, the sidelink communication module 1408 may be implemented as a processor, circuit, and / or instructions 1406 stored in the memory 1404 and executed by the processor 1402. In some examples, the sidelink communication module 1408 may be integrated into the modem subsystem 1412. For example, the sidelink communication module 1408 may be implemented by a combination of software components (e.g., executed by a DSP or general purpose processor) and hardware components (e.g., logic gates and circuits) within the modem subsystem 1412.

[0177] The sidelink communication module 1408 may be used in various aspects of the present disclosure, for example, Figures 1 to 12C The sidelink communication module 1408 may be configured to send one or more SL resource configurations to one or more UEs configured to communicate using the SL protocol. For example, the sidelink communication module 1408 may be configured to send SL resource pool configurations and / or SL synchronization communications, as further described below.

[0178] As shown, the transceiver 1410 may include a modem subsystem 1412 and an RF unit 1414. The transceiver 1410 may be configured to communicate bidirectionally with other devices (such as UE 115 and / or 1300 and / or another core network element). The modem subsystem 1412 may be configured to modulate and / or encode data according to an MCS (e.g., an LDPC decoding scheme, a turbo decoding scheme, a convolutional decoding scheme, a digital beamforming scheme, etc.). The RF unit 1414 may be configured to process (e.g., perform analog-to-digital conversion or digital-to-analog conversion, etc.) the modulated / encoded data (e.g., grants, resource allocations) from the modem subsystem 1412 (regarding outbound transmissions) or from another source (such as UE 115 and / or UE 1300). The RF unit 1414 may also be configured to perform analog beamforming in conjunction with digital beamforming. Although shown as being integrated together in the transceiver 1410, the modem subsystem 1412 and / or the RF unit 1414 may be separate devices that are coupled together to communicate with other devices.

[0179] The RF unit 1414 may provide modulated and / or processed data, e.g., data packets (or more generally, data messages that may include one or more data packets and other information), to the antenna 1416 for transmission to one or more other devices. For example, according to some aspects of the present disclosure, this may include the transmission of information to complete attachment to the network and communication with the pre-occupied UE 115 or 1300. The antenna 1416 may also receive data messages sent from other devices and provide received data messages for processing and / or demodulation at the transceiver 1410. The transceiver 1410 may provide the demodulated and decoded data (e.g., S-SSB, SL data, SCI) to the sidelink communication module 1408 for processing. The antenna 1416 may include multiple antennas of similar or different designs to maintain multiple transmit links.

[0180] In an aspect, the network entity 1400 may include multiple transceivers 1410 that implement different RATs (e.g., NR and LTE). In an aspect, the network entity 1400 may include a single transceiver 1410 that implements multiple RATs (e.g., NR and LTE). In an aspect, the transceiver 1410 may include various components, where different combinations of components may implement different RATs.

[0181] Fig.15 1 is a flow chart of a method 1500 for supporting an S-SSB design for shared spectrum according to one or more aspects of the present disclosure. The operations of the method 1500 may be implemented by a UE or a component thereof as described herein. For example, the operations of the method 1500 may be implemented by a UE or a component thereof as described herein. Figures 1 to 12C The UE 115 described herein may be executed. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0182] At 1505, the method may include a wireless communication device receiving a first configuration indicating a side link (SL) synchronous communication resource. In some aspects, the wireless communication device includes a user equipment (UE) configured for SL communication in a shared frequency band. For example, the UE may be configured for SL unlicensed (SL-U) communication with one or more other UEs in the shared frequency band. In some aspects, receiving the first configuration may include receiving one or more radio resource control (RRC) messages or information elements indicating one or more parameters for SL synchronous communication resources. In some aspects, the SL synchronous communication resources may include time-frequency resources for conveying SL synchronization signal blocks (S-SSBs). In some aspects, the SL synchronous communication resources may include one or more time slots and / or one or more symbols in the time domain. In some aspects, the SL synchronous communication resources may include one or more SL synchronous communication candidates or instances. For example, the wireless communication device may be configured to select at least one S-SSB candidate from a plurality of configured candidates for conveying at least one S-SSB. In some aspects, the SL synchronous communication resources include at least one time slot, which includes 14 symbols. In some aspects, the at least one time slot may include a plurality of symbols allocated to a physical broadcast channel (PBCH) signal, two or more symbols allocated to a primary synchronization signal (PSS), and two or more symbols allocated to a secondary synchronization signal (SSS). The last symbol may be a gap symbol. In this regard, the SL synchronization resource may be the same as Fig.11A The resources illustrated in are similar or identical.

[0183] In another aspect, the SL synchronization communication resource may include at least one time slot including a first SSB candidate and a second SSB candidate. In some aspects, each S-SSB candidate in the SSB candidates includes four consecutive symbols. In some aspects, the first symbol of each candidate is allocated for the PSS, the second symbol and the fourth symbol are allocated for the PBCH signal, and the third symbol is allocated for the combination of the SSS and the PBCH signal. In this regard, the SL synchronization communication resource may be related to Fig. 11B The resources illustrated in are similar or identical.

[0184] In some aspects, receiving the SL synchronous communication configuration may include receiving a SL resource allocation configuration from a network entity. The SL resource allocation may be indicated in a SL BWP configuration provided by an RRC IE. For example, the SL synchronous communication configuration may be indicated in a SL-ResourcePool IE. On the other hand, receiving the SL synchronous communication may include receiving a SL-SyncConfig IE indicating timing parameters associated with communication of the S-SSB.

[0185] In some aspects, the SL synchronization communication resources may occupy a portion of the shared frequency band. For example, the SL synchronization resources may occupy 11 resource blocks (RBs) of the shared frequency band. In some aspects, the shared frequency band is approximately 20 MHz. However, the present disclosure also contemplates other bandwidths for the shared frequency band, including 10 MHz, 15 MHz, 25 MHz, 30 MHz, 40 MHz and / or any other suitable bandwidth. On the other hand, the SL synchronization communication resources may occupy 11 RBs for the PSS and 20 RBs for the SSS and PBCH. On the other hand, the SL synchronization communication resources may include a subset of resources from the SL resource pool. For example, the SL resource pool may include time and frequency resources for SL data, SL control information, SL feedback information and / or SL reference signals. In some aspects, the SL resource pool may include physical side link control channel (PSCCH) resources, physical side link shared channel (PSSCH) resources, physical side link feedback channel (PSFCH) resources and / or any other suitable resources. For example, as Figure 7 and Figure 8 As shown, the SL resource pool may include a subset of resources allocated for at least one S-SSB candidate. Therefore, the resources allocated for SL synchronous communication may include a combination of S-SSB time slots and SL resource pool resources.

[0186] In some aspects, the frequency resources allocated for SL synchronous communication can be lower than the network specification or requirement. For example, in some instances, the frequency resources allocated for SL synchronous communication can be lower than 2 MHz. In some aspects, the bandwidth occupied by SL synchronous communication can be based on the subcarrier spacing (SCS) used for the communication. In some aspects, the SCS may also be referred to as a parameter set. For example, if the SL synchronous communication resources include 11 RBs and the wireless communication device is configured to communicate using an SCS of 15 kHz, the bandwidth of SL synchronous communication using an SCS of 15 kHz can be lower than the 2 MHz threshold. In other aspects, for a given SCS, the SL synchronous communication resources may exceed 2 MHz, but may be lower than an occupied channel bandwidth (OCB) threshold of 80%. The operation of 1505 may be performed according to the examples disclosed herein. In some examples, various aspects of the operation of 1505 may be performed by reference to Fig.13 The described side link communication module 1308 is performed.

[0187] At 1510, method 1500 may include the wireless communication device receiving a second configuration indicating a SL resource pool. The SL resource pool may be associated with a first SCS. In some aspects, when operating in mode 1 resource allocation, receiving the second configuration may include receiving an SL-ResourcePoolIE. The SL-ResourcePoolIE may indicate the SL synchronization resource configuration described above with respect to action 1505. The SL resource pool may include a bandwidth in a shared frequency band. For example, the bandwidth indicated in the SL resource pool may include a plurality of RBs, such as, for example, 11 RBs, 16 RBs, 24 RBs, 25 RBs, 38 RBs, 51 RBs, 52 RBs, 65 RBs, 106 RBs and / or any other suitable number of RBs. The bandwidth of the SL resource may be 5MHz, 10MHz, 15MHz, 20MHz, 25MHz, 30MHz, 40MHz, 50MHz, 60MHz, 80MHz, 100MHz and / or any other suitable bandwidth. In some aspects, the SCS may be based on the frequency range of the SL resource pool. The operations of 1510 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1510 may be performed as described in reference to Fig.13 The described side link communication module 1308 is performed.

[0188] At 1515, method 1500 includes the wireless communication device sending SL synchronous communication based on a second SCS greater than the first SCS based on the first configuration. In this regard, the shared frequency band can be associated with the first SCS. In some aspects, the first configuration and / or the second configuration may include or indicate the first SCS. The wireless communication device may be configured to use a second SCS greater than the first SCS to send SL synchronous communication. In one example, the SL resource pool may be associated with an SCS of 15kHz, and the sending of SL synchronous communication may be based on an SCS of 30kHz, 60kHz, 120kHz, and / or any other suitable parameter set. Therefore, the bandwidth of the SL communication sent in the SL resource pool may be based on a parameter set of 15kHz, and the bandwidth of the SL synchronous communication may be based on an SCS of 30kHz, an SCS of 60kHz, an SCS of 120kHz, and / or any other suitable SCS greater than the first SCS. In another example, the SL resource pool may be associated with an SCS of 30kHz, and SL synchronous communication may be sent using an SCS of 60kHz, an SCS of 120kHz, and / or any other suitable SCS.

[0189] In other aspects, the second SCS may be the same as the first SCS used to send SL data in the SL resource pool. For example, the wireless communication device may be configured with a fixed SCS or parameter set for SL synchronous communication. In some aspects, the wireless communication device may be configured with a fixed minimum SCS or parameter set for SL synchronous communication, so that the SCS used for SL synchronous communication may vary with the configured SL resource pool, but is not allowed to be lower than the minimum fixed SCS. In some aspects, the fixed SCS or the minimum fixed SCS may be 30kHz, 60kHz, 120kHz, or any other suitable SCS. In one example, if the SL resource pool is configured with an SCS of 15kHz or an SCS of 30kHz, the wireless communication device may be configured to use an SCS of 30kHz. If the SL resource pool is configured with an SCS of 60kHz, the second SCS may be increased to 60kHz with the SL resource pool. Other examples are also contemplated in the present disclosure.

[0190] It will be appreciated that action 1515 may include Fig.10 In this regard, sending SL synchronization communications using a larger second SCS may include sending an S-SSB. Sending the S-SSB using a larger second SCS may cause the S-SSB to occupy a larger portion of the shared frequency band that would be occupied if the S-SSB was sent using the first SCS. In other words, sending the SL synchronization communications may include sending SL synchronization that occupies a second portion of the shared frequency band, the second portion of the shared frequency band being larger than the first portion and including the first portion. In some aspects, the second portion may include at least 2 MHz. In another aspect, the second portion may include at least 80% of the shared frequency band.

[0191] In another aspect, action 1515 may include rate matching the SL synchronization communication and sending the rate matched SL synchronization communication. The rate matching may include rate matching the SL synchronization to occupy the second portion of the shared frequency band. In other aspects, action 1515 may include sending the SL synchronization communication with a fill signal extending beyond the frequency resources that would be allocated to the SL synchronization communication if the first SCS was used. In some examples, aspects of the operation of 1515 may be as described in reference to Fig.13 The described side link communication module 1308 is performed.

[0192] At act 1520, method 1500 includes the wireless communication device sending, based on the second configuration, a SL communication based on the first SCS. In some aspects, sending the SL communication may include sending SCI and / or SL data in PSCCH and PSSCH, respectively. PSCCH and PSSCH may be included in the SL resource pool indicated in the second configuration. In some aspects, act 1520 may include Fig.10In some aspects, the SL resource pool may include one or more SL synchronous communication candidates. Thus, in some aspects, sending the SL communication in act 1520 may include sending the SL synchronous communication based on the first SCS.

[0193] In some aspects, the SL synchronization communication resource may include one or more time slots. Each time slot may include two or more SL synchronization candidate positions. For example, each time slot may include two or more four-symbol SL synchronization candidate positions, as described above with respect to Fig. 11B and Fig. 12A On the other hand, for example, Fig. 12B As shown, each time slot may include three or more SL synchronization candidate positions. On the other hand, the SL synchronization communication resource may include multiple time slots, including a first time slot that is consecutive to a second time slot. At least one of the SL synchronization candidate positions may include a portion of the first time slot (e.g., one or more symbols) and a portion of the second time slot (e.g., one or more other symbols). In other words, the SL synchronization communication resource may include one or more SL synchronization candidate positions located across time slots. In some examples, aspects of the operation of 1520 may be performed as described in reference to Fig.13 The described side link communication module 1308 is performed.

[0194] As described above, the SL synchronous communication resources indicated in the first configuration may include one or more time slots allocated for one or more SL synchronous communications. On the other hand, the SL synchronous communication resources may include resources in a SL resource pool, so that the SL resource pool includes SL data resources and SL synchronous communication resources. In some aspects, the SL synchronous communication resources include a combination of SL synchronous communication time slots and SL synchronous communication resources in the SL resource pool. In some aspects, method 1500 may also include receiving a signal to activate: one or more time slots allocated to one or more SL synchronous communications; and additional SL synchronous resources and SL data resources; or a combination thereof. In some aspects, receiving the signal may include receiving the first configuration. For example, the first configuration may include a field, parameter, value, or other indicator indicating a trigger for activating the SL synchronization resource.

[0195] Fig.16 1600 is a flowchart of a method 1600 for supporting an S-SSB design for shared spectrum according to one or more aspects of the present disclosure. The operations of the method 1600 may be implemented by a UE or a component thereof as described herein. For example, the operations of the method 1600 may be implemented by a UE or a component thereof as described in reference to Figures 1 to 12CThe UE 115 described herein may be executed. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0196] At 1605, the method may include a wireless communication device receiving a first configuration indicating a side link (SL) synchronous communication resource. In some aspects, the SL synchronous communication resource includes a first portion of a shared frequency band. The first portion of the shared frequency band may include a plurality of RBs. In some aspects, the wireless communication device includes a user equipment (UE) configured for SL communication in a shared frequency band. For example, the UE may be configured for SL unlicensed (SL-U) communication with one or more other UEs in the shared frequency band. In some aspects, receiving the first configuration may include receiving one or more radio resource control (RRC) messages or information elements indicating one or more parameters for the SL synchronous communication resource. In some aspects, the SL synchronous communication resource may include a time-frequency resource for conveying a SL synchronization signal block (S-SSB). In some aspects, the SL synchronous communication resource may include one or more time slots and / or one or more symbols in a time domain. In some aspects, the SL synchronous communication resource may include one or more SL synchronous communication candidates or instances. For example, the wireless communication device may be configured to select at least one S-SSB candidate from a plurality of configured candidates for conveying at least one S-SSB. In some aspects, the SL synchronous communication resource includes at least one time slot, which includes 14 symbols. In some aspects, the at least one time slot may include a plurality of symbols allocated to a physical broadcast channel (PBCH) signal, two or more symbols allocated to a primary synchronization signal (PSS), and two or more symbols allocated to a secondary synchronization signal (SSS). The last symbol may be a gap symbol. In this regard, the SL synchronization resource may be the same as Fig.11A The resources illustrated in are similar or identical.

[0197] In another aspect, the SL synchronization communication resource may include at least one time slot including a first SSB candidate and a second SSB candidate. In some aspects, each S-SSB candidate in the SSB candidates includes four consecutive symbols. In some aspects, the first symbol of each candidate is allocated for the PSS, the second symbol and the fourth symbol are allocated for the PBCH signal, and the third symbol is allocated for the combination of the SSS and the PBCH signal. In this regard, the SL synchronization communication resource may be related to Fig. 11B The resources illustrated in are similar or identical.

[0198] In some aspects, receiving SL synchronization communication may include receiving SL resource allocation configuration from a network entity. SL resource allocation may be indicated in a SL BWP configuration provided by an RRC IE. For example, the SL synchronization configuration may be indicated in a SL-ResourcePool IE. On the other hand, receiving SL synchronization communication may include receiving a SL-SyncConfig IE indicating timing parameters associated with communication of the S-SSB.

[0199] In some aspects, the first portion of the shared spectrum band may include 11 resource blocks (RBs) of the shared spectrum band. On the other hand, the SL synchronous communication resources may occupy 11 RBs for the PSS and 20 RBs for the SSS and PBCH. On the other hand, the SL synchronous communication resources may include a subset of resources from a SL resource pool. For example, the SL resource pool may include time and frequency resources for SL data, SL control information, SL feedback information, and / or SL reference signals. In some aspects, the SL resource pool may include physical sidelink control channel (PSCCH) resources, physical sidelink shared channel (PSSCH) resources, physical sidelink feedback channel (PSFCH) resources, and / or any other suitable resources. For example, as Figure 7 and Figure 8 As shown, the SL resource pool may include a subset of resources allocated for at least one S-SSB candidate. Therefore, the resources allocated for SL synchronous communication may include a combination of S-SSB time slots and SL resource pool resources.

[0200] In some aspects, the first portion of the shared frequency band allocated for SL synchronous communication can be below the network specification or requirement. For example, in some instances, the first portion of the shared frequency band can be below 2 MHz. In some aspects, the bandwidth occupied by SL synchronous communication can be based on the subcarrier spacing (SCS) used for the communication. In other aspects, the first portion can be at or above 2 MHz, but can be below another OCB threshold. For example, the first portion can be less than 80% of the bandwidth of the shared frequency band. In some examples, various aspects of the operation of 1605 can be as described in reference Fig.13 The described side link communication module 1308 is performed.

[0201] At 1610, method 1600 includes the wireless communication device sending, based on the first configuration, SL synchronous communication that is rate matched to occupy a second portion of the shared frequency band. In some aspects, the second portion of the shared frequency band is greater than the first portion of the shared frequency band and includes the first portion of the shared frequency band. In some aspects, the rate matching SL synchronous communication includes or causes frequency filling of the SL synchronous communication such that the SL synchronous communication occupies additional RBs and / or REs in the frequency domain.

[0202] It will be appreciated that action 1610 may include FIG. 11A to FIG. 12C In this regard, sending SL synchronization communications using a larger second SCS may include sending an S-SSB. Sending the S-SSB using a larger second SCS may cause the S-SSB to occupy a larger portion of the shared frequency band that would be occupied if the S-SSB was sent using the first SCS. In other words, sending the SL synchronization communications may include sending SL synchronization that occupies a second portion of the shared frequency band, the second portion of the shared frequency band being larger than the first portion and including the first portion. In some aspects, the second portion may include at least 2 MHz. In another aspect, the second portion may include at least 80% of the shared frequency band.

[0203] On the other hand, the SL synchronous communication resource includes a time slot and a first number of RBs, such as 11 RBs and / or 20 RBs as described above. On the other hand, a first number of RBs may be allocated for PBCH signals, PSS signals, and SSS signals. In some aspects, rate-matched SL synchronous communication may include rate-matching SL synchronization to occupy a second number of RBs that is more than the first number of RBs. For example, the wireless communication device may at least rate-match the PBCH to occupy 20 RBs, or occupy more than 20 RBs. In some aspects, the second number of RBs may meet one or more channel occupancy thresholds and / or requirements. For example, in some aspects, the first number of RBs may occupy less than 2MHz. In some aspects, rate-matched SL synchronization with a second number of RBs may occupy more than 2MHz. In another example, for at least one SCS, the first number of RBs may not meet an OCB threshold of 80%. The second number of RBs may be at, close to, or above an OCB threshold of 80%.

[0204] On the other hand, the SL synchronization communication resource includes a time slot, a first number of resource blocks (RBs) allocated for a physical broadcast channel (PBCH) signal, and a second number of RBs allocated for at least a primary synchronization signal (PSS). In some aspects, the first number of RBs is more than the second number of RBs. For example, the SL synchronization communication resource may include one or more S-SSB candidates, each S-SSB candidate having four symbols in the time domain. The first number of RBs may be 11 RBs, and the second number of RBs may be 20 RBs. The time slot may include a first SL synchronization communication candidate and a second SL synchronization communication candidate. In some aspects, sending SL synchronization communication may include sending in one of the first SL synchronization candidate or the second SL synchronization candidate: a PSS, which occupies a second number of RBs, and a PBCH signal, which is rate matched to occupy a third number of RBs that is more than the first number of RBs. In some aspects, the third number of RBs may meet one or more channel occupancy thresholds and / or requirements. For example, in some aspects, the first number of RBs may occupy less than 2MHz. In some aspects, rate-matched SL synchronization with a third number of RBs may occupy more than 2MHz. In another example, for at least one SCS, the first number of RBs may not meet the 80% OCB threshold. The second number of RBs may be at, close to, or above the 80% OCB threshold.

[0205] As described above, the SL synchronous communication resources indicated in the first configuration may include one or more time slots allocated for one or more SL synchronous communications. In another aspect, the SL synchronous communication resources may include resources in a SL resource pool, such that the SL resource pool includes SL data resources and SL synchronous communication resources. In some aspects, the SL synchronous communication resources include a combination of SL synchronous communication time slots and SL synchronous communication resources in the SL resource pool, such as Figure 7 and Figure 8 . In some aspects, method 1600 may also include receiving a signal activating: one or more time slots allocated to one or more SL synchronous communications; and additional SL synchronization resources and SL data resources; or a combination thereof. In some aspects, receiving the signal may include receiving a first configuration. For example, the first configuration may include a field, parameter, value, or other indicator indicating a trigger for activating the SL synchronization resource. In some examples, aspects of the operation of 1610 may be as described in reference Fig.13 The described side link communication module 1308 is performed.

[0206] The following provides an overview of various aspects of the disclosure:

[0207] Aspect 1. A method of wireless communication performed by a wireless communication device, the method comprising: receiving a first configuration indicating a side link (SL) synchronous communication resource; receiving a second configuration indicating an SL resource pool, the SL resource pool being associated with a first subcarrier spacing (SCS); sending SL synchronous communication based on a second SCS greater than the first SCS based on the first configuration; and sending SL communication based on the first SCS based on the second configuration.

[0208] Aspect 2. A method according to Aspect 1, wherein the second SCS is one of 30 kHz, 60 kHz or 120 kHz.

[0209] Aspect 3. A method according to any one of Aspects 1 to 2, wherein the first configuration indicates a first portion of a shared frequency band, the first portion is allocated for the SL synchronization communication, and wherein the sending of the SL synchronization communication includes sending the SL synchronization occupying a second portion of the shared frequency band, the second portion of the shared frequency band being larger than the first portion and including the first portion.

[0210] Aspect 4. The method according to aspect 3, wherein the second portion comprises at least 80% of the shared frequency band.

[0211] Aspect 5. A method according to any one of Aspects 3 to 4, wherein sending the SL synchronization communication includes rate matching the SL synchronization communication to occupy the second part.

[0212] Aspect 6. A method according to any one of Aspects 1 to 5, wherein the SL synchronous communication resource includes one or more time slots allocated for one or more SL synchronous communications, and wherein each of the one or more time slots includes two or more SL synchronous communication candidates.

[0213] Aspect 7. The method according to aspect 6, wherein each of the one or more time slots includes three or more SL synchronization communication candidates.

[0214] Aspect 8. A method according to any one of Aspects 6 to 7, wherein the one or more time slots include a first time slot and a second time slot subsequent to the first time slot, and wherein a first SL synchronization communication candidate occupies at least a portion of the first time slot and at least a portion of the second time slot.

[0215] Aspect 9. A method according to any one of Aspects 6 to 8, wherein the SL resource pool includes additional SL synchronization resources and SL data resources, and wherein the additional SL synchronization resources are allocated for at least one SL synchronization communication candidate.

[0216] Aspect 10. A method according to any one of Aspects 1 to 9, wherein: the first configuration indicates one or more time slots allocated for one or more SL synchronous communications; the second configuration indicates additional SL synchronization resources and SL data resources; or a combination thereof.

[0217] Aspect 11. The method according to Aspect 10 further includes: receiving a signal, the signal activating: the one or more time slots allocated for the one or more SL synchronous communications; the additional SL synchronization resources and the SL data resources; or a combination thereof.

[0218] Aspect 12. A method according to any one of aspects 1 to 11, wherein the wireless communication device is a user equipment (UE).

[0219] Aspect 13. A method of wireless communication performed by a wireless communication device, the method comprising: receiving a first configuration indicating a side link (SL) synchronous communication resource, wherein the SL synchronous communication resource includes a first portion of a shared frequency band for SL synchronous communication; and based on the first configuration, sending the SL synchronous communication that is rate matched to occupy a second portion of the shared frequency band, the second portion of the shared frequency band being larger than the first portion of the shared frequency band and including the first portion of the shared frequency band.

[0220] Aspect 14. A method according to Aspect 13, wherein: the SL synchronous communication resources include a time slot and a first number of resource blocks (RBs); the first number of RBs are allocated for a physical broadcast channel (PBCH) signal, a primary synchronization signal (PSS) and a secondary synchronization signal (SSS); and the sending of the SL synchronous communication includes sending the SL synchronous communication so that at least the PBCH signal is rate matched to occupy a second number of RBs greater than the first number of RBs.

[0221] Aspect 15. A method according to any one of Aspects 13 to 14, wherein: the SL synchronization communication resources include a time slot, a first number of resource blocks (RBs) allocated for a physical broadcast channel (PBCH) signal, and a second number of RBs allocated for at least a primary synchronization signal (PSS), the first number of RBs is more than the second number of RBs, the time slot includes a first SL synchronization communication candidate and a second SL synchronization communication candidate; and the sending of the SL synchronization communication includes sending in one of the first SL synchronization candidate or the second SL synchronization candidate: the PSS, the PSS occupying the second number of RBs; and the PBCH signal, the PBCH signal is rate matched to occupy the third number of RBs that is more than the first number of RBs.

[0222] Aspect 16. A method according to any one of Aspects 13 to 15, wherein the SL synchronous communication resource includes one or more time slots allocated for one or more SL synchronous communications, and wherein each of the one or more time slots includes two or more SL synchronous communication candidates.

[0223] Aspect 17. The method according to aspect 16, wherein each of the one or more time slots comprises three or more SL synchronization communication candidates.

[0224] Aspect 18. A method according to any one of Aspects 16 to 17, wherein the one or more time slots include a first time slot and a second time slot subsequent to the first time slot, and wherein a first SL synchronization communication candidate occupies at least a portion of the first time slot and at least a portion of the second time slot.

[0225] Aspect 19. According to any one of Aspects 16 to 18, the method further includes: receiving a second configuration indicating a SL resource pool, wherein the SL resource pool includes additional SL synchronization resources and SL data resources, and wherein the additional SL synchronization resources are allocated for at least one SL synchronization communication candidate.

[0226] Aspect 20. According to any one of Aspects 13 to 19, the method further includes: receiving a second configuration indicating a SL resource pool; and wherein: the first configuration indicates one or more time slots allocated for one or more SL synchronous communications; the second configuration indicates additional SL synchronization resources and SL data resources; or a combination thereof.

[0227] Aspect 21. The method according to Aspect 20 further includes: receiving a signal, the signal activating: the one or more time slots allocated for the one or more SL synchronous communications; the additional SL synchronization resources and the SL data resources; or a combination thereof.

[0228] Aspect 22. A method according to any one of aspects 13 to 21, wherein the wireless communication device is a user equipment (UE).

[0229] Aspect 23: An apparatus for performing wireless communications at a first UE, the apparatus comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method according to any one of Aspects 1 to 12.

[0230] Aspect 30: An apparatus for wireless communication at a first UE, the apparatus comprising: at least one means for performing the method according to any one of aspects 1 to 12.

[0231] Aspect 31: A non-transitory computer-readable medium storing a code for wireless communication at a first UE, the code comprising instructions executable by a processor to perform a method according to any one of aspects 1 to 12.

[0232] Aspect 32: An apparatus for performing wireless communications at a first UE, the apparatus comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method according to any one of Aspects 13 to 22.

[0233] Aspect 33: An apparatus for wireless communication at a first UE, the apparatus comprising: at least one means for performing a method according to any one of aspects 13 to 22.

[0234] Aspect 34: A non-transitory computer-readable medium storing code for wireless communication at a first UE, the code comprising instructions executable by a processor to perform a method according to any one of aspects 13 to 22.

[0235] It should be noted that the methods described herein describe possible implementations, and that the operations and steps may be rearranged or otherwise modified and other implementations are possible. In addition, aspects from two or more methods may be combined.

[0236] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein may also be applicable to networks other than LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may be applicable to various other wireless communication systems, such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0237] The information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be mentioned throughout the specification may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or optical particles, or any combination thereof.

[0238] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or performed with a general purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic components, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0239] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. When implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on a computer-readable medium, or sent via a computer-readable medium. Other examples and specific implementations are within the scope of the present disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hard wiring, or a combination of any of these items. Features implementing the functions may also be physically located at different locations, including being distributed so that the various parts of the functions are implemented at different physical locations.

[0240] Computer-readable medium includes both non-transient computer storage medium and communication medium, and it includes any medium that facilitates computer program to transfer from one place to another.Non-transient storage medium can be any available medium that can be accessed by general or special-purpose computer.By way of example and not limitation, non-transient computer-readable medium can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disc (CD) ROM or other optical disc storage device, disk storage device or other magnetic storage device, or can be used for carrying or storing desired program code components and any other non-transient medium that can be accessed by general or special-purpose computer or general or special-purpose processor in the form of instruction or data structure.Moreover, any connection is appropriately referred to as computer-readable medium.For example, if software is sent from website, server or other remote source using coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL) or wireless technology such as infrared, radio and microwave, then coaxial cable, optical fiber cable, twisted pair, DSL or wireless technology such as infrared, radio and microwave are included in the definition of computer-readable medium. Disk and disc, as used herein, includes CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0241] As used herein (including in the claims), "or" used in a list of items (e.g., a list of items followed by a phrase such as "at least one of" or "one or more of") indicates an inclusive list, such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). In addition, as used herein, the phrase "based on" should not be interpreted as a reference to a closed set of conditions. For example, an example step described as "based on condition A" can be based on condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0242] The term "determining" encompasses a variety of actions, and thus, "determining" may include calculating, computing, processing, deriving, investigating, looking up (such as via looking up in a table, database or other data structure), ascertaining, and similar actions. Additionally, "determining" may include receiving (such as receiving information), accessing (such as accessing data in a memory), and similar actions. Additionally, "determining" may include resolving, obtaining, selecting, choosing, establishing, and other such similar actions.

[0243] In the drawings, similar components or features may have the same reference label. In addition, various components of the same type may be distinguished by following the reference label with a dash and a second label to distinguish between similar components. If only the first reference label is used in the specification, the description may apply to any of the similar components having the same first reference label regardless of the second reference label, or other subsequent reference labels.

[0244] The descriptions set forth herein in conjunction with the accompanying drawings describe example configurations and do not represent all examples that may be implemented or within the scope of the claims. The term "example" as used herein means "used as an example, instance, or illustration," rather than "preferred" or "advantageous over other examples." The specific implementation includes specific details to provide an understanding of the technology. However, the technologies may be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the examples.

[0245] The description herein is provided to enable one of ordinary skill in the art to implement or use the present disclosure. Various modifications to the present disclosure will be apparent to one of ordinary skill in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Thus, the present disclosure is not limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method of wireless communication performed by a wireless communication device, the method comprising: receiving a first configuration indicating sidelink (SL) synchronous communication resources, wherein the SL synchronous communication resources include a first portion of a shared frequency band for SL synchronous communications; as well as Based on the first configuration, the SL synchronous communication is transmitted that is rate matched to occupy a second portion of the shared frequency band, the second portion of the shared frequency band being greater than and including the first portion of the shared frequency band.

2. The method according to claim 1, wherein: The SL synchronous communication resources include a time slot and a first number of resource blocks (RBs); The first number of RBs is allocated for a physical broadcast channel (PBCH) signal, a primary synchronization signal (PSS), and a secondary synchronization signal (SSS); and The sending the SL synchronization communication includes sending the SL synchronization communication such that at least the PBCH signal is rate matched to occupy a second number of RBs greater than the first number of RBs.

3. The method according to claim 1, wherein: The SL synchronization communication resources include a time slot, a first number of resource blocks (RBs) allocated for a physical broadcast channel (PBCH) signal, and a second number of RBs allocated for at least a primary synchronization signal (PSS), The first number of RBs is greater than the second number of RBs, The time slot includes a first SL synchronous communication candidate and a second SL synchronous communication candidate; as well as The sending of the SL synchronization communication includes sending in one of the first SL synchronization candidate or the second SL synchronization candidate: the PSS, the PSS occupying the second number of RBs; and The PBCH signal is rate matched to occupy a third number of RBs greater than the first number of RBs.

4. The method of claim 1, wherein the SL synchronous communication resource comprises one or more time slots allocated for one or more SL synchronous communications, and wherein each of the one or more time slots comprises two or more SL synchronous communication candidates. The method of claim 4 , wherein each of the one or more time slots comprises three or more SL synchronization communication candidates.

6. The method of claim 4, wherein the one or more time slots include a first time slot and a second time slot subsequent to the first time slot, and wherein a first SL synchronization communication candidate occupies at least a portion of the first time slot and at least a portion of the second time slot.

7. The method according to claim 4, further comprising: A second configuration indicating a SL resource pool is received, wherein the SL resource pool includes additional SL synchronization resources and SL data resources, and wherein the additional SL synchronization resources are allocated for at least one SL synchronization communication candidate.

8. The method according to claim 1, further comprising: receiving a second configuration indicating a SL resource pool; and in: The first configuration indicates one or more time slots allocated for synchronous communication of one or more SLs; The second configuration indicates additional SL synchronization resources and SL data resources; or A combination of them.

9. The method according to claim 8, further comprising: Receiving a signal, said signal activating: the one or more time slots allocated for synchronous communication of the one or more SLs; the further SL synchronization resource and the SL data resource; or A combination of them.

10. The method of claim 1, wherein the wireless communication device is a user equipment (UE).

11. A wireless communication device, comprising: Transceiver; Memory devices; and a processor in communication with the transceiver and the memory device, wherein the wireless communication device is configured to: receiving a first configuration indicating sidelink (SL) synchronous communications resources, wherein the SL synchronous communications resources include a first portion of a shared frequency band for SL synchronous communications; and Based on the first configuration, SL synchronous communications are transmitted that are rate matched to occupy a second portion of the shared frequency band, the second portion of the shared frequency band being greater than and including the first portion of the shared frequency band.

12. The wireless communication device of claim 11, wherein: The SL synchronous communication resources include a time slot and a first number of resource blocks (RBs); The first number of RBs is allocated for a physical broadcast channel (PBCH) signal, a primary synchronization signal (PSS), and a secondary synchronization signal (SSS); and The wireless communication device is configured to transmit the SL synchronization communication such that at least the PBCH signal is rate matched to occupy a second number of RBs greater than the first number of RBs.

13. The wireless communication device of claim 11, wherein: The SL synchronization communication resources include a time slot, a first number of resource blocks (RBs) allocated for a physical broadcast channel (PBCH) signal, and a second number of RBs allocated for at least a primary synchronization signal (PSS), The first number of RBs is greater than the second number of RBs, The time slot includes a first SL synchronous communication candidate and a second SL synchronous communication candidate; and The wireless communication device is configured to send in one of the first SL synchronization candidate or the second SL synchronization candidate: the PSS, the PSS occupying the second number of RBs; and The PBCH signal is rate matched to occupy a third number of RBs greater than the first number of RBs.

14. The wireless communication device according to claim 11, wherein the SL synchronous communication resource includes one or more time slots allocated for one or more SL synchronous communications, and wherein each of the one or more time slots includes two or more SL synchronous communication candidates.

15. The wireless communication device of claim 14, wherein each of the one or more time slots includes three or more SL synchronization communication candidates.

16. The wireless communication device of claim 14, wherein the one or more time slots include a first time slot and a second time slot subsequent to the first time slot, and wherein a first SL synchronization communication candidate occupies at least a portion of the first time slot and at least a portion of the second time slot.

17. The wireless communication device of claim 14, wherein the wireless communication device is further configured to: A second configuration indicating a SL resource pool is received, wherein the SL resource pool includes additional SL synchronization resources and SL data resources, and wherein the additional SL synchronization resources are allocated for at least one SL synchronization communication candidate.

18. The wireless communication device of claim 11, wherein the wireless communication device is further configured to: receiving a second configuration indicating a SL resource pool; and in: The first configuration indicates one or more time slots allocated for synchronous communication of one or more SLs; The second configuration indicates additional SL synchronization resources and SL data resources; or A combination of them.

19. The wireless communication device of claim 18, wherein the wireless communication device is further configured to: Receiving a signal, said signal activating: the one or more time slots allocated for synchronous communication of the one or more SLs; the further SL synchronization resource and the SL data resource; or A combination of them.

20. The wireless communication device of claim 11, wherein the wireless communication device is a user equipment (UE).

21. A non-transitory computer readable medium having program code recorded thereon, wherein the program code comprises instructions executable by a processor of a wireless communication device to cause the wireless communication device to: receiving a first configuration indicating sidelink (SL) synchronous communications resources, wherein the SL synchronous communications resources include a first portion of a shared frequency band for SL synchronous communications; and Based on the first configuration, SL synchronous communications are transmitted that are rate matched to occupy a second portion of the shared frequency band, the second portion of the shared frequency band being greater than and including the first portion of the shared frequency band.

22. The non-transitory computer readable medium of claim 21, wherein: The SL synchronous communication resources include a time slot and a first number of resource blocks (RBs); The first number of RBs is allocated for a physical broadcast channel (PBCH) signal, a primary synchronization signal (PSS), and a secondary synchronization signal (SSS); and The program code includes instructions that cause the wireless communication device to transmit the SL synchronization communication such that at least the PBCH signal is rate matched to occupy a second number of RBs greater than the first number of RBs.

23. The non-transitory computer readable medium of claim 21, wherein: The SL synchronization communication resources include a time slot, a first number of resource blocks (RBs) allocated for a physical broadcast channel (PBCH) signal, and a second number of RBs allocated for at least a primary synchronization signal (PSS), The first number of RBs is greater than the second number of RBs, The time slot includes a first SL synchronous communication candidate and a second SL synchronous communication candidate; and The program code includes instructions that cause the wireless communication device to send in one of the first SL synchronization candidate or the second SL synchronization candidate: the PSS, the PSS occupying the second number of RBs; and The PBCH signal is rate matched to occupy a third number of RBs greater than the first number of RBs.

24. The non-transitory computer-readable medium of claim 21, wherein the SL synchronous communication resource comprises one or more time slots allocated for one or more SL synchronous communications, and wherein each of the one or more time slots comprises two or more SL synchronous communication candidates.

25. The non-transitory computer-readable medium of claim 24, wherein each of the one or more time slots comprises three or more SL synchronization communication candidates.

26. The non-transitory computer-readable medium of claim 24, wherein the one or more time slots include a first time slot and a second time slot subsequent to the first time slot, and wherein a first SL synchronous communication candidate occupies at least a portion of the first time slot and at least a portion of the second time slot.

27. The non-transitory computer readable medium of claim 24, wherein the program code further comprises instructions that cause the wireless communication device to: A second configuration indicating a SL resource pool is received, wherein the SL resource pool includes additional SL synchronization resources and SL data resources, and wherein the additional SL synchronization resources are allocated for at least one SL synchronization communication candidate.

28. The non-transitory computer readable medium of claim 21, wherein the program code further comprises instructions that cause the wireless communication device to: receiving a second configuration indicating a SL resource pool; and in: The first configuration indicates one or more time slots allocated for synchronous communication of one or more SLs; The second configuration indicates additional SL synchronization resources and SL data resources; or A combination of them.

29. The non-transitory computer readable medium of claim 28, wherein the program code further comprises instructions that cause the wireless communication device to: Receiving a signal, said signal activating: the one or more time slots allocated for synchronous communication of the one or more SLs; the further SL synchronization resource and the SL data resource; or A combination of them.

30. A wireless communication device, comprising: means for receiving a first configuration indicating sidelink (SL) synchronous communications resources, wherein the SL synchronous communications resources include a first portion of a shared frequency band for SL synchronous communications; as well as Means for transmitting the SL synchronous communication rate matched to occupy a second portion of the shared frequency band based on the first configuration, the second portion of the shared frequency band being greater than and including the first portion of the shared frequency band.

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