Cyclic prefix extension design for joint collision protection of sidelink positioning reference signal transmissions in shared bands

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a set of cyclic prefix extension (CPE) starting positions specific to a sidelink location service session. The UE may transmit, within a first location service session time window, a sidelink positioning reference signal (SL-PRS) based at least in part on a CPE value selected from the set of CPE values specific to the sidelink location service session. The CPE starting position may correspond to a same CPE starting position for all transmissions performed for the sidelink location service session. The CPE starting position may be different from CPE starting positions for one or more other sidelink location service sessions comprising a second location service session time window that at least partially overlaps with the first location service session time window. Numerous other aspects are described.

Description

CYCLIC PREFIX EXTENSION DESIGN FOR JOINT COLLISION PROTECTION OFSIDELINK POSITIONING REFERENCE SIGNAL TRANSMISSIONS IN SHARED BANDSCROSS-REFERENCE TO RELATED APPLICATION

[0001] This Patent Application claims priority to Greek Patent Application No.20240100458, filed on June 25, 2024, entitled “CYCLIC PREFIX EXTENSION DESIGN FOR JOINT COLLISION PROTECTION OF SIDELINK POSITIONING REFERENCE SIGNAL TRANSMISSIONS IN SHARED BANDS,” and assigned to the assignee hereof. The disclosure of the prior Application is considered part of and is incorporated by reference into this Patent Application.FIELD OF THE DISCLOSURE

[0002] Aspects of the present disclosure generally relate to wireless communication and specifically relate to techniques, apparatuses, and methods for cyclic prefix extension design for joint collision protection of sidelink positioning reference signal transmissions in shared bands.BACKGROUND

[0003] Wireless communication systems are widely deployed to provide various services that may include carrying voice, text, messaging, video, data, and / or other traffic. The services may include unicast, multicast, and / or broadcast services, among other examples. Typical wireless communication systems may employ multiple-access radio access technologies (RATs) capable of supporting communication with multiple users by sharing available system resources (for example, time domain resources, frequency domain resources, spatial domain resources, and / or device transmit power, among other examples). Examples of such multiple-access RATs include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC- FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.

[0004] The above multiple-access RATs have been adopted in various telecommunication standards to provide common protocols that enable different wireless communication devices to communicate on a municipal, national, regional, or global level. An example telecommunication standard is New Radio (NR). NR, which may also be referred to as 5G, is part of a continuous mobile broadband evolution promulgated by the Third Generation Partnership Project (3 GPP). NR (and other mobile broadband evolutions beyond NR) may be designed to better support Internet of things (loT) and reduced capability device deployments, industrial connectivity, millimeter wave (mmWave) expansion, licensed and unlicensedspectrum access, non-terrestrial network (NTN) deployment, sidelink and other device-to- device direct communication technologies (for example, cellular vehicle-to-everything (CV2X) communication), massive multiple-input multiple -output (MIMO), disaggregated network architectures and network topology expansions, multiple-subscriber implementations, high- precision positioning, and / or radio frequency (RF) sensing, among other examples. As the demand for mobile broadband access continues to increase, further improvements in NR may be implemented, and other radio access technologies such as 6G may be introduced, to further advance mobile broadband evolution.SUMMARY

[0005] Some aspects described herein relate to a method of wireless communication performed by a user equipment (UE). The method may include receiving a set of cyclic prefix extension (CPE) starting positions specific to a sidelink location service session. The method may include transmitting, within a first location service session time window, a sidelink positioning reference signal (SL-PRS) based at least in part on a CPE starting position selected from the set of CPE starting positions specific to the sidelink location service session. The CPE starting position may correspond to a same CPE starting position for all transmissions performed for the sidelink location service session. The CPE starting position may be different from CPE starting positions for one or more other sidelink location service sessions comprising a second location service session time window that at least partially overlaps with the first location service session time window.

[0006] Some aspects described herein relate to a non-transitory computer-readable medium that stores a set of instructions for wireless communication by a UE. The set of instructions, when executed by one or more processors of the UE, may cause the UE to receive a set of CPE starting positions specific to a sidelink location service session. The set of instructions, when executed by one or more processors of the UE, may cause the UE to transmit, within a first location service session time window, an SL-PRS based at least in part on a CPE starting position selected from the set of CPE starting positions specific to the sidelink location service session. The CPE starting position may correspond to a same CPE starting position for all transmissions performed for the sidelink location service session. The CPE starting position may be different from CPE starting positions for one or more other sidelink location service sessions comprising a second location service session time window that at least partially overlaps with the first location service session time window.

[0007] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include one or more memories and one or more processors coupled to the one or more memories. The one or more processors may be configured to receive a set of CPE starting positions specific to a sidelink location service session. The one or more processorsmay be configured to transmit, within a first location service session time window, an SL-PRS based at least in part on a CPE starting position selected from the set of CPE starting positions specific to the sidelink location service session. The CPE starting position may correspond to a same CPE starting position for all transmissions performed for the sidelink location service session. The CPE starting position may be different from CPE starting positions for one or more other sidelink location service sessions comprising a second location service session time window that at least partially overlaps with the first location service session time window.

[0008] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for receiving a set of CPE starting positions specific to a sidelink location service session. The apparatus may include means for transmitting, within a first location service session time window, an SL-PRS based at least in part on a CPE starting position selected from the set of CPE starting positions specific to the sidelink location service session. The CPE starting position may correspond to a same CPE starting position for all transmissions performed for the sidelink location service session. The CPE starting position may be different from CPE starting positions for one or more other sidelink location service sessions comprising a second location service session time window that at least partially overlaps with the first location service session time window.

[0009] Aspects of the present disclosure may generally be implemented by or as a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, network node, network entity, wireless communication device, and / or processing system as substantially described with reference to, and as illustrated by, the specification and accompanying drawings.

[0010] The foregoing paragraphs of this section have broadly summarized some aspects of the present disclosure. These and additional aspects and associated advantages will be described hereinafter. The disclosed aspects may be used as a basis for modifying or designing other aspects for carrying out the same or similar purposes of the present disclosure. Such equivalent aspects do not depart from the scope of the appended claims. Characteristics of the aspects disclosed herein, both their organization and method of operation, together with associated advantages, will be better understood from the following description when considered in connection with the accompanying drawings.BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The appended drawings illustrate some aspects of the present disclosure, but are not limiting of the scope of the present disclosure because the description may enable other aspects. Each of the drawings is provided for purposes of illustration and description, and not as a definition of the limits of the claims. The same or similar reference numbers in different drawings may identify the same or similar elements.

[0012] Fig. 1 is a diagram illustrating an example of a wireless communication network, in accordance with the present disclosure.

[0013] Fig. 2 is a diagram illustrating an example network node in communication with an example user equipment (UE) in a wireless network, in accordance with the present disclosure.

[0014] Fig. 3 is a diagram illustrating an example disaggregated base station architecture, in accordance with the present disclosure.

[0015] Fig. 4 is a diagram illustrating an example of sidelink communications, in accordance with the present disclosure.

[0016] Fig. 5 is a diagram illustrating an example of sidelink communications and access link communications, in accordance with the present disclosure.

[0017] Fig. 6 is a diagram illustrating an example of utilizing cyclic prefix extensions (CPEs) to avoid collisions over a sidelink communication channel, in accordance with the present disclosure.

[0018] Fig. 7 is a diagram illustrating an example of sidelink positioning and location service sessions involving multiple transmitting UEs, in accordance with the present disclosure.

[0019] Fig. 8 is a diagram illustrating an example associated with a CPE design for joint collision protection of sidelink positioning reference signal (SL-PRS) transmission in shared bands, in accordance with the present disclosure.

[0020] Fig. 9 is a diagram illustrating an example process performed, for example, at a UE or an apparatus of a UE, in accordance with the present disclosure.

[0021] Fig. 10 is a diagram of an example apparatus for wireless communication, in accordance with the present disclosure.DETAILED DESCRIPTION

[0022] Various aspects of the present disclosure are described hereinafter with reference to the accompanying drawings. However, aspects of the present disclosure may be embodied in many different forms and is not to be construed as limited to any specific aspect illustrated by or described with reference to an accompanying drawing or otherwise presented in this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. One skilled in the art may appreciate that the scope of the disclosure is intended to cover any aspect of the disclosure disclosed herein, whether implemented independently of or in combination with any other aspect of the disclosure. For example, an apparatus may be implemented or a method may be practiced using various combinations or quantities of the aspects set forth herein. In addition, the scope of the disclosure is intended to cover an apparatus having, or a method that is practiced using, other structures and / or functionalities in addition to or other than the structuresand / or functionalities with which various aspects of the disclosure set forth herein may be practiced. Any aspect of the disclosure disclosed herein may be embodied by one or more elements of a claim.

[0023] Several aspects of telecommunication systems will now be presented with reference to various methods, operations, apparatuses, and techniques. These methods, operations, apparatuses, and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, or algorithms (collectively referred to as “elements”). These elements may be implemented using hardware, software, or a combination of hardware and software. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

[0024] In a shared or unlicensed frequency band, a transmitting device may contend against other devices for channel access before transmitting on a shared or unlicensed channel to reduce and / or prevent collisions on the shared or unlicensed channel. To contend for channel access, the transmitting device may perform a channel access procedure, such as a listen-before-talk (or listen-before-transmit) (LBT) procedure or another type of channel access procedure, for shared or unlicensed frequency band channel access. The channel access procedure may be performed to determine whether the physical channel (e.g., the radio resources of the channel) are free to use or are busy (e.g., in use by another wireless communication device such as a user equipment (UE), an internet of things (loT) device, or a wireless wide area network (WLAN) device, among other examples). The channel access procedure may include sensing or measuring the physical channel (e.g., performing a reference signal received power (RSRP) measurement, detecting an energy level, or performing another type of measurement) during a channel access gap (which may also be referred to as a contention window (CW)) and determining whether the shared or unlicensed channel is free or busy based at least in part on the signals sensed or measured on the physical channel (e.g., based at least in part on whether the measurement satisfies a threshold). If the transmitting device determines that the channel access procedure was successful, the transmitting device may perform one or more transmissions on the shared or unlicensed channel during a transmission opportunity (TXOP), which may extend for a channel occupancy time (COT).

[0025] In some cases, the transmitting device may transmit a cyclic prefix extension (CPE) prior to (or along with) the transmission to facilitate alignment of orthogonal frequency division multiplexing (OFDM) symbols and to reduce inter-symbol interference (ISI) . In some cases, when performing a sidelink transmission over the shared or unlicensed channel, a CPE may be utilized to avoid collisions among sidelink transmissions that are intended to be performed over the same slot.

[0026] For example, if no reservation (e.g., via sidelink control information (SCI)) has been made for a slot that a first UE intends to transmit over, the first UE may select a CPE out of a set of pre-configured CPEs according to a priority associated with the transmission. A second UE may intend to perform a transmission over the same slot and may select a CPE that is different from the CPE selected by the first UE. If the CPE selected by the first UE is longer than the CPE selected by the second UE, the first UE will start its transmission first due to the CPE being transmitted prior to the slot. When the second UE performs an LBT procedure prior to transmitting the CPE, the second UE will detect activity on the sidelink channel (e.g., the transmission of the CPE by the first UE) and will determine that the slot is unavailable for a transmission, thereby avoiding a collision with the transmission by the first UE.

[0027] However, the collision protection provided by utilizing CPEs may be on a per transmission basis. For example, to achieve a common goal (e.g., to determine a current position of a UE), multiple signals may need to be transmitted by a group of wireless communication devices at approximately the same time. Because each wireless communication device may choose a different CPE, one or more of the wireless communication devices may be prevented from transmitting a signal by a UE that is not included in the group of wireless communication devices based on that UE selecting a longer CPE than the UEs included in the group of wireless communication devices. The prevention of the UE from transmitting a signal may result in rendering the remaining signals invalid.

[0028] Various aspects relate generally to utilizing CPEs for joint collision protection of sidelink transmissions in shared frequency bands. Some aspects more specifically relate to each wireless communication device included in a same communication session utilizing a same CPE value to avoid collision of transmissions. In some aspects, the CPE value may correspond to a CPE duration (e.g., a value indicating a duration of a CPE) and / or a CPE starting position (e.g., a value indicating a time and / or a resource at which a start of a transmission of a CPE is to occur). For example, a group of wireless communication devices may participate in, e.g., a location service session to determine positioning information for one or more of the wireless communication devices, where each wireless communication device may intend to transmit a respective signal within a time period. Each wireless communication device may select a same CPE value to provide collision avoidance protection for the set of signals transmitted by the wireless communication devices. In addition, various aspects described herein may relate to rules for selection of the same CPE value withing a communication session and / or selection of different CPE values across different communication sessions to help facilitate collision avoidance across multiple communication sessions.

[0029] Particular aspects of the subject matter described in this disclosure can be implemented to realize one or more of the following potential advantages. In some examples,by utilizing the same CPE value, the described techniques can be used to utilize CPEs for collision protection for a group of signals, rather than on a per transmission basis.

[0030] Multiple-access radio access technologies (RATs) have been adopted in various telecommunication standards to provide common protocols that enable wireless communication devices to communicate on a municipal, enterprise, national, regional, or global level. For example, 5G New Radio (NR) is part of a continuous mobile broadband evolution promulgated by the Third Generation Partnership Project (3GPP). 5G NR supports various technologies and use cases including enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), massive machine-type communication (mMTC), millimeter wave (mmWave) technology, beamforming, network slicing, edge computing, loT connectivity and management, and network function virtualization (NFV).

[0031] As the demand for broadband access increases and as technologies supported by wireless communication networks evolve, further technological improvements may be adopted in or implemented for 5G NR or future RATs, such as 6G, to further advance the evolution of wireless communication for a wide variety of existing and new use cases and applications. Such technological improvements may be associated with new frequency band expansion, licensed and unlicensed spectrum access, overlapping spectrum use, small cell deployments, nonterrestrial network (NTN) deployments, disaggregated network architectures and network topology expansion, device aggregation, advanced duplex communication, sidelink and other device-to-device direct communication, loT (including passive or ambient loT) networks, reduced capability (RedCap) UE functionality, industrial connectivity, multiple-subscriber implementations, high-precision positioning, radio frequency (RF) sensing, and / or artificial intelligence or machine learning (AI / ML), among other examples. These technological improvements may support use cases such as wireless backhauls, wireless data centers, extended reality (XR) and metaverse applications, meta services for supporting vehicle connectivity, holographic and mixed reality communication, autonomous and collaborative robots, vehicle platooning and cooperative maneuvering, sensing networks, gesture monitoring, human-brain interfacing, digital twin applications, asset management, and universal coverage applications using non-terrestrial and / or aerial platforms, among other examples. The methods, operations, apparatuses, and techniques described herein may enable one or more of the foregoing technologies and / or support one or more of the foregoing use cases.

[0032] Fig. 1 is a diagram illustrating an example of a wireless communication network 100, in accordance with the present disclosure. The wireless communication network 100 may be or may include elements of a 5G (or NR) network or a 6G network, among other examples. The wireless communication network 100 may include multiple network nodes 110, shown as a network node (NN) 110a, a network node 110b, a network node 110c, and a network node 1 lOd.The network nodes 110 may support communications with multiple UEs 120, shown as a UE 120a, a UE 120b, a UE 120c, a UE 120d, and a UE 120e.

[0033] The network nodes 110 and the UEs 120 of the wireless communication network 100 may communicate using the electromagnetic spectrum, which may be subdivided by frequency or wavelength into various classes, bands, carriers, and / or channels. For example, devices of the wireless communication network 100 may communicate using one or more operating bands. In some aspects, multiple wireless communication networks 100 may be deployed in a given geographic area. Each wireless communication network 100 may support a particular RAT (which may also be referred to as an air interface) and may operate on one or more carrier frequencies in one or more frequency ranges. Examples of RATs include a 4G RAT, a 5G / NR RAT, and / or a 6G RAT, among other examples. In some examples, when multiple RATs are deployed in a given geographic area, each RAT in the geographic area may operate on different frequencies to avoid interference with one another.

[0034] Various operating bands have been defined as frequency range designations FR1 (410 MHz through 7.125 GHz), FR2 (24.25 GHz through 52.6 GHz), FR3 (7.125 GHz through 24.25 GHz), FR4a or FR4-1 (52.6 GHz through 71 GHz), FR4 (52.6 GHz through 114.25 GHz), and FR5 (114.25 GHz through 300 GHz). Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as a “Sub-6 GHz” band in some documents and articles. Similarly, FR2 is often referred to (interchangeably) as a “millimeter wave” band in some documents and articles, despite being different than the extremely high frequency (EHF) band (30 GHz through 300 GHz), which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band. The frequencies between FR1 and FR2 are often referred to as mid-band frequencies, which include FR3. Frequency bands falling within FR3 may inherit FR1 characteristics or FR2 characteristics, and thus may effectively extend features of FR1 or FR2 into mid-band frequencies. Thus, “sub-6 GHz,” if used herein, may broadly refer to frequencies that are less than 6 GHz, that are within FR1, and / or that are included in mid-band frequencies. Similarly, the term “millimeter wave,” if used herein, may broadly refer to frequencies that are included in mid-band frequencies, that are within FR2, FR4, FR4-a or FR4- 1, or FR5, and / or that are within the EHF band. Higher frequency bands may extend 5G NR operation, 6G operation, and / or other RATs beyond 52.6 GHz. For example, each of FR4a, FR4-1, FR4, and FR5 falls within the EHF band. In some examples, the wireless communication network 100 may implement dynamic spectrum sharing (DSS), in which multiple RATs (for example, 4G / Long Term Evolution (LTE) and 5G / NR) are implemented with dynamic bandwidth allocation (for example, based on user demand) in a single frequency band. It is contemplated that the frequencies included in these operating bands (for example, FR1, FR2, FR3, FR4, FR4-a, FR4-1, and / or FR5) may be modified, and techniques described herein may be applicable to those modified frequency ranges.

[0035] A network node 110 may include one or more devices, components, or systems that enable communication between a UE 120 and one or more devices, components, or systems of the wireless communication network 100. A network node 110 may be, may include, or may also be referred to as an NR network node, a 5G network node, a 6G network node, a Node B, an eNB, a gNB, an access point (AP), a transmission reception point (TRP), a mobility element, a core, a network entity, a network element, a network equipment, and / or another type of device, component, or system included in a radio access network (RAN).

[0036] A network node 110 may be implemented as a single physical node (for example, a single physical structure) or may be implemented as two or more physical nodes (for example, two or more distinct physical structures). For example, a network node 110 may be a device or system that implements part of a radio protocol stack, a device or system that implements a full radio protocol stack (such as a full gNB protocol stack), or a collection of devices or systems that collectively implement the full radio protocol stack. For example, and as shown, a network node 110 may be an aggregated network node (having an aggregated architecture), meaning that the network node 110 may implement a full radio protocol stack that is physically and logically integrated within a single node (for example, a single physical structure) in the wireless communication network 100. For example, an aggregated network node 110 may consist of a single standalone base station or a single TRP that uses a full radio protocol stack to enable or facilitate communication between a UE 120 and a core network of the wireless communication network 100.

[0037] Alternatively, and as also shown, a network node 110 may be a disaggregated network node (sometimes referred to as a disaggregated base station), meaning that the network node 110 may implement a radio protocol stack that is physically distributed and / or logically distributed among two or more nodes in the same geographic location or in different geographic locations. For example, a disaggregated network node may have a disaggregated architecture. In some deployments, disaggregated network nodes 110 may be used in an integrated access and backhaul (IAB) network, in an open radio access network (O-RAN) (such as a network configuration in compliance with the O-RAN Alliance), or in a virtualized radio access network (vRAN), also known as a cloud radio access network (C-RAN), to facilitate scaling by separating base station functionality into multiple units that can be individually deployed.

[0038] The network nodes 110 of the wireless communication network 100 may include one or more central units (CUs), one or more distributed units (DUs), and / or one or more radio units (RUs). A CU may host one or more higher layer control functions, such as radio resource control (RRC) functions, packet data convergence protocol (PDCP) functions, and / or service data adaptation protocol (SDAP) functions, among other examples. A DU may host one or more of a radio link control (RLC) layer, a medium access control (MAC) layer, and / or one or more higher physical (PHY) layers depending, at least in part, on a functional split, such as afunctional split defined by the 3GPP. In some examples, a DU also may host one or more lower PHY layer functions, such as a fast Fourier transform (FFT), an inverse FFT (iFFT), beamforming, physical random access channel (PRACH) extraction and filtering, and / or scheduling of resources for one or more UEs 120, among other examples. An RU may host RF processing functions or lower PHY layer functions, such as an FFT, an iFFT, beamforming, or PRACH extraction and filtering, among other examples, according to a functional split, such as a lower layer functional split. In such an architecture, each RU can be operated to handle over the air (OTA) communication with one or more UEs 120.

[0039] In some aspects, a single network node 110 may include a combination of one or more CUs, one or more DUs, and / or one or more RUs. Additionally or alternatively, a network node 110 may include one or more Near-Real Time (Near-RT) RAN Intelligent Controllers (RICs) and / or one or more Non-Real Time (Non-RT) RICs. In some examples, a CU, a DU, and / or an RU may be implemented as a virtual unit, such as a virtual central unit (VCU), a virtual distributed unit (VDU), or a virtual radio unit (VRU), among other examples. A virtual unit may be implemented as a virtual network function, such as associated with a cloud deployment.

[0040] Some network nodes 110 (for example, a base station, an RU, or a TRP) may provide communication coverage for a particular geographic area. In the 3GPP, the term “cell” can refer to a coverage area of a network node 110 or to a network node 110 itself, depending on the context in which the term is used. A network node 110 may support one or multiple (for example, three) cells. In some examples, a network node 110 may provide communication coverage for a macro cell, a pico cell, a femto cell, or another type of cell. A macro cell may cover a relatively large geographic area (for example, several kilometers in radius) and may allow unrestricted access by UEs 120 with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs 120 with service subscriptions. A femto cell may cover a relatively small geographic area (for example, a home) and may allow restricted access by UEs 120 having association with the femto cell (for example, UEs 120 in a closed subscriber group (CSG)). A network node 110 for a macro cell may be referred to as a macro network node. A network node 110 for a pico cell may be referred to as a pico network node. A network node 110 for a femto cell may be referred to as a femto network node or an in-home network node. In some examples, a cell may not necessarily be stationary. For example, the geographic area of the cell may move according to the location of an associated mobile network node 110 (for example, a train, a satellite base station, an unmanned aerial vehicle, or an NTN network node).

[0041] The wireless communication network 100 may be a heterogeneous network that includes network nodes 110 of different types, such as macro network nodes, pico network nodes, femto network nodes, relay network nodes, aggregated network nodes, and / ordisaggregated network nodes, among other examples. In the example shown in Fig. 1, the network node 110a may be a macro network node for a macro cell 130a, the network node 110b may be a pico network node for a pico cell 130b, and the network node 110c may be a femto network node for a femto cell 130c.Various different types of network nodes 110 may generally transmit at different power levels, serve different coverage areas, and / or have different impacts on interference in the wireless communication network 100 than other types of network nodes 110. For example, macro network nodes may have a high transmit power level (for example, 5 to 40 watts), whereas pico network nodes, femto network nodes, and relay network nodes may have lower transmit power levels (for example, 0. 1 to 2 watts).

[0042] In some examples, a network node 110 may be, may include, or may operate as an RU, a TRP, or a base station that communicates with one or more UEs 120 via a radio access link (which may be referred to as a “Uu” link). The radio access link may include a downlink and an uplink. “Downlink” (or “DL”) refers to a communication direction from a network node 110 to a UE 120, and “uplink” (or “UL”) refers to a communication direction from a UE 120 to a network node 110. Downlink channels may include one or more control channels and one or more data channels. A downlink control channel may be used to transmit downlink control information (DCI) (for example, scheduling information, reference signals, and / or configuration information) from a network node 110 to a UE 120. A downlink data channel may be used to transmit downlink data (for example, user data associated with a UE 120) from a network node 110 to a UE 120. Downlink control channels may include one or more physical downlink control channels (PDCCHs), and downlink data channels may include one or more physical downlink shared channels (PDSCHs). Uplink channels may similarly include one or more control channels and one or more data channels. An uplink control channel may be used to transmit uplink control information (UCI) (for example, reference signals and / or feedback corresponding to one or more downlink transmissions) from a UE 120 to a network node 110. An uplink data channel may be used to transmit uplink data (for example, user data associated with a UE 120) from a UE 120 to a network node 110. Uplink control channels may include one or more physical uplink control channels (PUCCHs), and uplink data channels may include one or more physical uplink shared channels (PUSCHs). The downlink and the uplink may each include a set of resources on which the network node 110 and the UE 120 may communicate.

[0043] Downlink and uplink resources may include time domain resources (frames, subframes, slots, and / or symbols), frequency domain resources (frequency bands, component carriers, subcarriers, resource blocks, and / or resource elements), and / or spatial domain resources (particular transmit directions and / or beam parameters). Frequency domain resources of some bands may be subdivided into bandwidth parts (BWPs). A BWP may be a continuous block of frequency domain resources (for example, a continuous block of resource blocks) that areallocated for one or more UEs 120. A UE 120 may be configured with both an uplink BWP and a downlink BWP (where the uplink BWP and the downlink BWP may be the same BWP or different BWPs). A BWP may be dynamically configured (for example, by a network node 110 transmitting a DCI configuration to the one or more UEs 120) and / or reconfigured, which means that a BWP can be adjusted in real-time (or near-real-time) based on changing network conditions in the wireless communication network 100 and / or based on the specific requirements of the one or more UEs 120. This enables more efficient use of the available frequency domain resources in the wireless communication network 100 because fewer frequency domain resources may be allocated to a BWP for a UE 120 (which may reduce the quantity of frequency domain resources that a UE 120 is required to monitor), leaving more frequency domain resources to be spread across multiple UEs 120. Thus, BWPs may also assist in the implementation of lower-capability UEs 120 by facilitating the configuration of smaller bandwidths for communication by such UEs 120.

[0044] As described above, in some aspects, the wireless communication network 100 may be, may include, or may be included in, an IAB network. In an IAB network, at least one network node 110 is an anchor network node that communicates with a core network. An anchor network node 110 may also be referred to as an IAB donor (or “lAB-donor”). The anchor network node 110 may connect to the core network via a wired backhaul link. For example, an Ng interface of the anchor network node 110 may terminate at the core network. Additionally or alternatively, an anchor network node 110 may connect to one or more devices of the core network that provide a core access and mobility management function (AMF). An IAB network also generally includes multiple non-anchor network nodes 110, which may also be referred to as relay network nodes or simply as IAB nodes (or “lAB-nodes”). Each nonanchor network node 110 may communicate directly with the anchor network node 110 via a wireless backhaul link to access the core network, or may communicate indirectly with the anchor network node 110 via one or more other non-anchor network nodes 110 and associated wireless backhaul links that form a backhaul path to the core network. Some anchor network node 110 or other non-anchor network node 110 may also communicate directly with one or more UEs 120 via wireless access links that carry access traffic. In some examples, network resources for wireless communication (such as time resources, frequency resources, and / or spatial resources) may be shared between access links and backhaul links.

[0045] In some examples, any network node 110 that relays communications may be referred to as a relay network node, a relay station, or simply as a relay. A relay may receive a transmission of a communication from an upstream station (for example, another network node 110 or a UE 120) and transmit the communication to a downstream station (for example, a UE 120 or another network node 110). In this case, the wireless communication network 100 may include or be referred to as a “multi-hop network.” In the example shown in Fig. 1, the networknode 1 lOd (for example, a relay network node) may communicate with the network node 110a (for example, a macro network node) and the UE 120d in order to facilitate communication between the network node 110a and the UE 120d. Additionally or alternatively, a UE 120 may be or may operate as a relay station that can relay transmissions to or from other UEs 120. A UE 120 that relays communications may be referred to as a UE relay or a relay UE, among other examples.

[0046] The UEs 120 may be physically dispersed throughout the wireless communication network 100, and each UE 120 may be stationary or mobile. A UE 120 may be, may include, or may be included in an access terminal, another terminal, a mobile station, or a subscriber unit. A UE 120 may be, include, or be coupled with a cellular phone (for example, a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device, a biometric device, a wearable device (for example, a smart watch, smart clothing, smart glasses, a smart wristband, and / or smart jewelry, such as a smart ring or a smart bracelet), an entertainment device (for example, a music device, a video device, and / or a satellite radio), an XR device, a vehicular component or sensor, a smart meter or sensor, industrial manufacturing equipment, a Global Navigation Satellite System (GNSS) device (such as a Global Positioning System device or another type of positioning device), a UE function of a network node, and / or any other suitable device or function that may communicate via a wireless medium.

[0047] A UE 120 and / or a network node 110 may include one or more chips, system-on- chips (SoCs), chipsets, packages, or devices that individually or collectively constitute or comprise a processing system. The processing system includes processor (or “processing”) circuitry in the form of one or multiple processors, microprocessors, processing units (such as central processing units (CPUs), graphics processing units (GPUs), neural processing units (NPUs) and / or digital signal processors (DSPs)), processing blocks, application-specific integrated circuits (ASIC), programmable logic devices (PLDs) (such as field programmable gate arrays (FPGAs)), or other discrete gate or transistor logic or circuitry (all of which may be generally referred to herein individually as “processors” or collectively as “the processor” or “the processor circuitry”). One or more of the processors may be individually or collectively configurable or configured to perform various functions or operations described herein. A group of processors collectively configurable or configured to perform a set of functions may include a first processor configurable or configured to perform a first function of the set and a second processor configurable or configured to perform a second function of the set, or may include the group of processors all being configured or configurable to perform the set of functions.

[0048] The processing system may further include memory circuitry in the form of one or more memory devices, memory blocks, memory elements or other discrete gate or transistor logic or circuitry, each of which may include tangible storage media such as random-access memory (RAM) or read-only memory (ROM), or combinations thereof (all of which may be generally referred to herein individually as “memories” or collectively as “the memory” or “the memory circuitry”). One or more of the memories may be coupled (for example, operatively coupled, communicatively coupled, electronically coupled, or electrically coupled) with one or more of the processors and may individually or collectively store processor-executable code (such as software) that, when executed by one or more of the processors, may configure one or more of the processors to perform various functions or operations described herein. Additionally or alternatively, in some examples, one or more of the processors may be preconfigured to perform various functions or operations described herein without requiring configuration by software. The processing system may further include or be coupled with one or more modems (such as a Wi-Fi (for example, Institute of Electrical and Electronics Engineers (IEEE) compliant) modem or a cellular (for example, 3GPP 4G LTE, 5G, or 6G compliant) modem). In some implementations, one or more processors of the processing system include or implement one or more of the modems. The processing system may further include or be coupled with multiple radios (collectively “the radio”), multiple RF chains, or multiple transceivers, each of which may in turn be coupled with one or more of multiple antennas. In some implementations, one or more processors of the processing system include or implement one or more of the radios, RF chains or transceivers. The UE 120 may include or may be included in a housing that houses components associated with the UE 120 including the processing system.

[0049] Some UEs 120 may be considered machine-type communication (MTC) UEs, evolved or enhanced machine-type communication (eMTC), UEs, further enhanced eMTC (feMTC) UEs, or enhanced feMTC (efeMTC) UEs, or further evolutions thereof, all of which may be simply referred to as “MTC UEs”. An MTC UE may be, may include, or may be included in or coupled with a robot, an uncrewed aerial vehicle, a remote device, a sensor, a meter, a monitor, and / or a location tag. Some UEs 120 may be considered loT devices and / or may be implemented as NB-IoT (narrowband loT) devices. An loT UE or NB-IoT device may be, may include, or may be included in or coupled with an industrial machine, an appliance, a refrigerator, a doorbell camera device, a home automation device, and / or a light fixture, among other examples. Some UEs 120 may be considered Customer Premises Equipment, which may include telecommunications devices that are installed at a customer location (such as a home or office) to enable access to a service provider's network (such as included in or in communication with the wireless communication network 100).

[0050] Some UEs 120 may be classified according to different categories in association with different complexities and / or different capabilities. UEs 120 in a first category may facilitate massive loT in the wireless communication network 100, and may offer low complexity and / or cost relative to UEs 120 in a second category. UEs 120 in a second category may include mission-critical loT devices, legacy UEs, baseline UEs, high-tier UEs, advanced UEs, fullcapability UEs, and / or premium UEs that are capable of URLLC, eMBB, and / or precise positioning in the wireless communication network 100, among other examples. A third category of UEs 120 may have mid-tier complexity and / or capability (for example, a capability between UEs 120 of the first category and UEs 120 of the second capability). A UE 120 of the third category may be referred to as a RedCap UE, a mid-tier UE, an NR-Light UE, and / or an NR-Lite UE, among other examples. RedCap UEs may bridge a gap between the capability and complexity of NB-IoT devices and / or eMTC UEs, and mission-critical loT devices and / or premium UEs. RedCap UEs may include, for example, wearable devices, loT devices, industrial sensors, and / or cameras that are associated with a limited bandwidth, power capacity, and / or transmission range, among other examples. RedCap UEs may support healthcare environments, building automation, electrical distribution, process automation, transport and logistics, and / or smart city deployments, among other examples.

[0051] In some examples, two or more UEs 120 (for example, shown as UE 120a and UE 120e) may communicate directly with one another using sidelink communications (for example, without communicating by way of a network node 110 as an intermediary). As an example, the UE 120a may directly transmit data, control information, or other signaling as a sidelink communication to the UE 120e. This is in contrast to, for example, the UE 120a first transmitting data in an UL communication to a network node 110, which then transmits the data to the UE 120e in a DL communication. In various examples, the UEs 120 may transmit and receive sidelink communications using peer-to-peer (P2P) communication protocols, device-to- device (D2D) communication protocols, vehicle-to-everything (V2X) communication protocols (which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, and / or vehicle-to-pedestrian (V2P) protocols), and / or mesh network communication protocols. In some deployments and configurations, a network node 110 may schedule and / or allocate resources for sidelink communications between UEs 120 in the wireless communication network 100. In some other deployments and configurations, a UE 120 (instead of a network node 110) may perform, or collaborate or negotiate with one or more other UEs to perform, scheduling operations, resource selection operations, and / or other operations for sidelink communications.

[0052] In various examples, some of the network nodes 110 and the UEs 120 of the wireless communication network 100 may be configured for full -duplex operation in addition to halfduplex operation. A network node 110 or a UE 120 operating in a half-duplex mode mayperform only one of transmission or reception during particular time resources, such as during particular slots, symbols, or other time periods. Half-duplex operation may involve timedivision duplexing (TDD), in which DL transmissions of the network node 110 and UL transmissions of the UE 120 do not occur in the same time resources (that is, the transmissions do not overlap in time). In contrast, a network node 110 or a UE 120 operating in a full-duplex mode can transmit and receive communications concurrently (for example, in the same time resources). By operating in a full-duplex mode, network nodes 110 and / or UEs 120 may generally increase the capacity of the network and the radio access link. In some examples, full- duplex operation may involve frequency-division duplexing (FDD), in which DL transmissions of the network node 110 are performed in a first frequency band or on a first component carrier and transmissions of the UE 120 are performed in a second frequency band or on a second component carrier different than the first frequency band or the first component carrier, respectively. In some examples, full-duplex operation may be enabled for a UE 120 but not for a network node 110. For example, a UE 120 may simultaneously transmit an UL transmission to a first network node 110 and receive a DL transmission from a second network node 110 in the same time resources. In some other examples, full-duplex operation may be enabled for a network node 110 but not for a UE 120. For example, a network node 110 may simultaneously transmit a DL transmission to a first UE 120 and receive an UL transmission from a second UE 120 in the same time resources. In some other examples, full-duplex operation may be enabled for both a network node 110 and a UE 120.

[0053] In some examples, the UEs 120 and the network nodes 110 may perform MIMO communication. “MIMO” generally refers to transmitting or receiving multiple signals (such as multiple layers or multiple data streams) simultaneously over the same time and frequency resources. MIMO techniques generally exploit multipath propagation. MIMO may be implemented using various spatial processing or spatial multiplexing operations. In some examples, MIMO may support simultaneous transmission to multiple receivers, referred to as multi-user MIMO (MU-MIMO). Some RATs may employ advanced MIMO techniques, such as mTRP operation (including redundant transmission or reception on multiple TRPs), reciprocity in the time domain or the frequency domain, single-frequency-network (SFN) transmission, or non-coherent joint transmission (NC-JT).

[0054] In some aspects, a UE 120 may include a communication manager 140. As described in more detail elsewhere herein, the communication manager 140 may receive a set of CPE starting positions associated with a sidelink location service session; and transmit, within a first location service session time window, an SL-PRS based at least in part on a CPE starting position selected from the set of CPE starting positions associated with the sidelink location service session. The CPE starting position may correspond to a same CPE starting position for all transmissions performed for the sidelink location service session. The CPE starting positionmay be different from CPE starting positions for one or more other sidelink location service sessions comprising a second location service session time window that at least partially overlaps with the first location service session time window. Additionally, or alternatively, the communication manager 140 may perform one or more other operations described herein.

[0055] As indicated above, Fig. 1 is provided as an example. Other examples may differ from what is described with regard to Fig. 1.

[0056] Fig. 2 is a diagram illustrating an example network node 110 in communication with an example UE 120 in a wireless network, in accordance with the present disclosure.

[0057] As shown in Fig. 2, the network node 110 may include a data source 212, a transmit processor 214, a transmit (TX) MIMO processor 216, a set of modems 232 (shown as 232a through 232t, where t > 1), a set of antennas 234 (shown as 234a through 234v, where v > 1), a MIMO detector 236, a receive processor 238, a data sink 239, a controller / processor 240, a memory 242, a communication unit 244, and / or a scheduler 246, among other examples. In some configurations, one or a combination of the antenna(s) 234, the modem(s) 232, the MIMO detector 236, the receive processor 238, the transmit processor 214, and / or the TX MIMO processor 216 may be included in a transceiver of the network node 110. The transceiver may be under control of and used by one or more processors, such as the controller / processor 240, and in some aspects in conjunction with processor-readable code stored in the memory 242, to perform aspects of the methods, processes, and / or operations described herein. In some aspects, the network node 110 may include one or more interfaces, communication components, and / or other components that facilitate communication with the UE 120 or another network node.

[0058] The terms “processor,” “controller,” or “controller / processor” may refer to one or more controllers and / or one or more processors. For example, reference to “a / the processor,” “a / the controller / processor,” or the like (in the singular) should be understood to refer to any one or more of the processors described in connection with Fig. 2, such as a single processor or a combination of multiple different processors. Reference to “one or more processors” should be understood to refer to any one or more of the processors described in connection with Fig. 2. For example, one or more processors of the network node 110 may include transmit processor 214, TX MIMO processor 216, MIMO detector 236, receive processor 238, and / or controller / processor 240. Similarly, one or more processors of the UE 120 may include MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, and / or controller / processor 280.

[0059] In some aspects, a single processor may perform all of the operations described as being performed by the one or more processors. In some aspects, a first set of (one or more) processors of the one or more processors may perform a first operation described as being performed by the one or more processors, and a second set of (one or more) processors of theone or more processors may perform a second operation described as being performed by the one or more processors. The first set of processors and the second set of processors may be the same set of processors or may be different sets of processors. Reference to “one or more memories” should be understood to refer to any one or more memories of a corresponding device, such as the memory described in connection with Fig. 2. For example, operation described as being performed by one or more memories can be performed by the same subset of the one or more memories or different subsets of the one or more memories.

[0060] For downlink communication from the network node 110 to the UE 120, the transmit processor 214 may receive data (“downlink data”) intended for the UE 120 (or a set of UEs that includes the UE 120) from the data source 212 (such as a data pipeline or a data queue). In some examples, the transmit processor 214 may select one or more modulation and coding schemes (MCSs) for the UE 120 in accordance with one or more channel quality indicators (CQIs) received from the UE 120. The network node 110 may process the data (for example, including encoding the data) for transmission to the UE 120 on a downlink in accordance with the MCS(s) selected for the UE 120 to generate data symbols. The transmit processor 214 may process system information (for example, semi-static resource partitioning information (SRPI)) and / or control information (for example, CQI requests, grants, and / or upper layer signaling) and provide overhead symbols and / or control symbols. The transmit processor 214 may generate reference symbols for reference signals (for example, a cell-specific reference signal (CRS), a demodulation reference signal (DMRS), or a channel state information (CSI) reference signal (CSI-RS)) and / or synchronization signals (for example, a primary synchronization signal (PSS) or a secondary synchronization signals (SSS)).

[0061] The TX MIMO processor 216 may perform spatial processing (for example, precoding) on the data symbols, the control symbols, the overhead symbols, and / or the reference symbols, if applicable, and may provide a set of output symbol streams (for example, T output symbol streams) to the set of modems 232. For example, each output symbol stream may be provided to a respective modulator component (shown as MOD) of a modem 232. Each modem 232 may use the respective modulator component to process (for example, to modulate) a respective output symbol stream (for example, for OFDM) to obtain an output sample stream. Each modem 232 may further use the respective modulator component to process (for example, convert to analog, amplify, filter, and / or upconvert) the output sample stream to obtain a time domain downlink signal. The modems 232a through 232t may together transmit a set of downlink signals (for example, T downlink signals) via the corresponding set of antennas 234.

[0062] A downlink signal may include a DCI communication, a MAC control element (MAC-CE) communication, an RRC communication, a downlink reference signal, or another type of downlink communication. Downlink signals may be transmitted on a PDCCH, a PDSCH, and / or on another downlink channel. A downlink signal may carry one or moretransport blocks (TBs) of data. A TB may be a unit of data that is transmitted over an air interface in the wireless communication network 100. A data stream (for example, from the data source 212) may be encoded into multiple TBs for transmission over the air interface. The quantity of TBs used to carry the data associated with a particular data stream may be associated with a TB size common to the multiple TBs. The TB size may be based on or otherwise associated with radio channel conditions of the air interface, the MCS used for encoding the data, the downlink resources allocated for transmitting the data, and / or another parameter. In general, the larger the TB size, the greater the amount of data that can be transmitted in a single transmission, which reduces signaling overhead. However, larger TB sizes may be more prone to transmission and / or reception errors than smaller TB sizes, but such errors may be mitigated by more robust error correction techniques.

[0063] For uplink communication from the UE 120 to the network node 110, uplink signals from the UE 120 may be received by an antenna 234, may be processed by a modem 232 (for example, a demodulator component, shown as DEMOD, of a modem 232), may be detected by the MIMO detector 236 (for example, a receive (Rx) MIMO processor) if applicable, and / or may be further processed by the receive processor 238 to obtain decoded data and / or control information. The receive processor 238 may provide the decoded data to a data sink 239 (which may be a data pipeline, a data queue, and / or another type of data sink) and provide the decoded control information to a processor, such as the controller / processor 240.

[0064] The network node 110 may use the scheduler 246 to schedule one or more UEs 120 for downlink or uplink communications. In some aspects, the scheduler 246 may use DCI to dynamically schedule DL transmissions to the UE 120 and / or UL transmissions from the UE 120. In some examples, the scheduler 246 may allocate recurring time domain resources and / or frequency domain resources that the UE 120 may use to transmit and / or receive communications using an RRC configuration (for example, a semi-static configuration), for example, to perform semi-persistent scheduling (SPS) or to configure a configured grant (CG) for the UE 120.

[0065] One or more of the transmit processor 214, the TX MIMO processor 216, the modem 232, the antenna 234, the MIMO detector 236, the receive processor 238, and / or the controller / processor 240 may be included in an RF chain of the network node 110. An RF chain may include one or more filters, mixers, oscillators, amplifiers, analog-to-digital converters (ADCs), and / or other devices that convert between an analog signal (such as for transmission or reception via an air interface) and a digital signal (such as for processing by one or more processors of the network node 110). In some aspects, the RF chain may be or may be included in a transceiver of the network node 110.

[0066] In some examples, the network node 110 may use the communication unit 244 to communicate with a core network and / or with other network nodes. The communication unit244 may support wired and / or wireless communication protocols and / or connections, such as Ethernet, optical fiber, common public radio interface (CPRI), and / or a wired or wireless backhaul, among other examples. The network node 110 may use the communication unit 244 to transmit and / or receive data associated with the UE 120 or to perform network control signaling, among other examples. The communication unit 244 may include a transceiver and / or an interface, such as a network interface.

[0067] The UE 120 may include a set of antennas 252 (shown as antennas 252a through 252r, where r > 1), a set of modems 254 (shown as modems 254a through 254u, where u > 1), a MIMO detector 256, a receive processor 258, a data sink 260, a data source 262, a transmit processor 264, a TX MIMO processor 266, a controller / processor 280, a memory 282, and / or a communication manager 140, among other examples. One or more of the components of the UE 120 may be included in a housing 284. In some aspects, one or a combination of the antenna(s) 252, the modem(s) 254, the MIMO detector 256, the receive processor 258, the transmit processor 264, or the TX MIMO processor 266 may be included in a transceiver that is included in the UE 120. The transceiver may be under control of and used by one or more processors, such as the controller / processor 280, and in some aspects in conjunction with processor-readable code stored in the memory 282, to perform aspects of the methods, processes, or operations described herein. In some aspects, the UE 120 may include another interface, another communication component, and / or another component that facilitates communication with the network node 110 and / or another UE 120.

[0068] For downlink communication from the network node 110 to the UE 120, the set of antennas 252 may receive the downlink communications or signals from the network node 110 and may provide a set of received downlink signals (for example, R received signals) to the set of modems 254. For example, each received signal may be provided to a respective demodulator component (shown as DEMOD) of a modem 254. Each modem 254 may use the respective demodulator component to condition (for example, filter, amplify, downconvert, and / or digitize) a received signal to obtain input samples. Each modem 254 may use the respective demodulator component to further demodulate or process the input samples (for example, for OFDM) to obtain received symbols. The MIMO detector 256 may obtain received symbols from the set of modems 254, may perform MIMO detection on the received symbols if applicable, and may provide detected symbols. The receive processor 258 may process (for example, decode) the detected symbols, may provide decoded data for the UE 120 to the data sink 260 (which may include a data pipeline, a data queue, and / or an application executed on the UE 120), and may provide decoded control information and system information to the controller / processor 280.

[0069] For uplink communication from the UE 120 to the network node 110, the transmit processor 264 may receive and process data (“uplink data”) from a data source 262 (such as adata pipeline, a data queue, and / or an application executed on the UE 120) and control information from the controller / processor 280. The control information may include one or more parameters, feedback, one or more signal measurements, and / or other types of control information. In some aspects, the receive processor 258 and / or the controller / processor 280 may determine, for a received signal (such as received from the network node 110 or another UE), one or more parameters relating to transmission of the uplink communication. The one or more parameters may include an RSRP parameter, a received signal strength indicator (RS SI) parameter, a reference signal received quality (RSRQ) parameter, a CQI parameter, or a transmit power control (TPC) parameter, among other examples. The control information may include an indication of the RSRP parameter, the RSSI parameter, the RSRQ parameter, the CQI parameter, the TPC parameter, and / or another parameter. The control information may facilitate parameter selection and / or scheduling for the UE 120 by the network node 110.

[0070] The transmit processor 264 may generate reference symbols for one or more reference signals, such as an uplink DMRS, an uplink sounding reference signal (SRS), and / or another type of reference signal. The symbols from the transmit processor 264 may be precoded by the TX MIMO processor 266, if applicable, and further processed by the set of modems 254 (for example, for DFT-s-OFDM or CP-OFDM). The TX MIMO processor 266 may perform spatial processing (for example, precoding) on the data symbols, the control symbols, the overhead symbols, and / or the reference symbols, if applicable, and may provide a set of output symbol streams (for example, U output symbol streams) to the set of modems 254. For example, each output symbol stream may be provided to a respective modulator component (shown as MOD) of a modem 254. Each modem 254 may use the respective modulator component to process (for example, to modulate) a respective output symbol stream (for example, for OFDM) to obtain an output sample stream. Each modem 254 may further use the respective modulator component to process (for example, convert to analog, amplify, fdter, and / or upconvert) the output sample stream to obtain an uplink signal.

[0071] The modems 254a through 254u may transmit a set of uplink signals (for example, R uplink signals or U uplink symbols) via the corresponding set of antennas 252. An uplink signal may include a UCI communication, a MAC-CE communication, an RRC communication, or another type of uplink communication. Uplink signals may be transmitted on a PUSCH, a PUCCH, and / or another type of uplink channel. An uplink signal may carry one or more TBs of data. Sidelink data and control transmissions (that is, transmissions directly between two or more UEs 120) may generally use similar techniques as were described for uplink data and control transmission, and may use sidelink-specific channels such as a physical sidelink shared channel (PSSCH), a physical sidelink control channel (PSCCH), and / or a physical sidelink feedback channel (PSFCH).

[0072] One or more antennas of the set of antennas 252 or the set of antennas 234 may include, or may be included within, one or more antenna panels, one or more antenna groups, one or more sets of antenna elements, or one or more antenna arrays, among other examples. An antenna panel, an antenna group, a set of antenna elements, or an antenna array may include one or more antenna elements (within a single housing or multiple housings), a set of coplanar antenna elements, a set of non-coplanar antenna elements, or one or more antenna elements coupled with one or more transmission or reception components, such as one or more components of Fig. 2. As used herein, “antenna” can refer to one or more antennas, one or more antenna panels, one or more antenna groups, one or more sets of antenna elements, or one or more antenna arrays. “Antenna panel” can refer to a group of antennas (such as antenna elements) arranged in an array or panel, which may facilitate beamforming by manipulating parameters of the group of antennas. “Antenna module” may refer to circuitry including one or more antennas, which may also include one or more other components (such as filters, amplifiers, or processors) associated with integrating the antenna module into a wireless communication device.

[0073] In some examples, each of the antenna elements of an antenna 234 or an antenna 252 may include one or more sub-elements for radiating or receiving radio frequency signals. For example, a single antenna element may include a first sub-element cross-polarized with a second sub-element that can be used to independently transmit cross-polarized signals. The antenna elements may include patch antennas, dipole antennas, and / or other types of antennas arranged in a linear pattern, a two-dimensional pattern, or another pattern. A spacing between antenna elements may be such that signals with a desired wavelength transmitted separately by the antenna elements may interact or interfere constructively and destructively along various directions (such as to form a desired beam). For example, given an expected range of wavelengths or frequencies, the spacing may provide a quarter wavelength, a half wavelength, or another fraction of a wavelength of spacing between neighboring antenna elements to allow for the desired constructive and destructive interference patterns of signals transmitted by the separate antenna elements within that expected range.

[0074] The amplitudes and / or phases of signals transmitted via antenna elements and / or subelements may be modulated and shifted relative to each other (such as by manipulating phase shift, phase offset, and / or amplitude) to generate one or more beams, which is referred to as beamforming. The term “beam” may refer to a directional transmission of a wireless signal toward a receiving device or otherwise in a desired direction. “Beam” may also generally refer to a direction associated with such a directional signal transmission, a set of directional resources associated with the signal transmission (for example, an angle of arrival, a horizontal direction, and / or a vertical direction), and / or a set of parameters that indicate one or more aspects of a directional signal, a direction associated with the signal, and / or a set of directionalresources associated with the signal. In some implementations, antenna elements may be individually selected or deselected for directional transmission of a signal (or signals) by controlling amplitudes of one or more corresponding amplifiers and / or phases of the signal(s) to form one or more beams. The shape of a beam (such as the amplitude, width, and / or presence of side lobes) and / or the direction of a beam (such as an angle of the beam relative to a surface of an antenna array) can be dynamically controlled by modifying the phase shifts, phase offsets, and / or amplitudes of the multiple signals relative to each other.

[0075] Different UEs 120 or network nodes 110 may include different numbers of antenna elements. For example, a UE 120 may include a single antenna element, two antenna elements, four antenna elements, eight antenna elements, or a different number of antenna elements. As another example, a network node 110 may include eight antenna elements, 24 antenna elements, 64 antenna elements, 128 antenna elements, or a different number of antenna elements. Generally, a larger number of antenna elements may provide increased control over parameters for beam generation relative to a smaller number of antenna elements, whereas a smaller number of antenna elements may be less complex to implement and may use less power than a larger number of antenna elements. Multiple antenna elements may support multiple-layer transmission, in which a first layer of a communication (which may include a first data stream) and a second layer of a communication (which may include a second data stream) are transmitted using the same time and frequency resources with spatial multiplexing.

[0076] While blocks in Fig. 2 are illustrated as distinct components, the functions described above with respect to the blocks may be implemented in a single hardware, software, or combination component or in various combinations of components. For example, the functions described with respect to the transmit processor 264, the receive processor 258, and / or the TX MIMO processor 266 may be performed by or under the control of the controller / processor 280.

[0077] Fig. 3 is a diagram illustrating an example disaggregated base station architecture 300, in accordance with the present disclosure. One or more components of the example disaggregated base station architecture 300 may be, may include, or may be included in one or more network nodes (such one or more network nodes 110). The disaggregated base station architecture 300 may include a CU 310 that can communicate directly with a core network 320 via a backhaul link, or that can communicate indirectly with the core network 320 via one or more disaggregated control units, such as a Non-RT RIC 350 associated with a Service Management and Orchestration (SMO) Framework 360 and / or a Near-RT RIC 370 (for example, via an E2 link). The CU 310 may communicate with one or more DUs 330 via respective midhaul links, such as via Fl interfaces. Each of the DUs 330 may communicate with one or more RUs 340 via respective fronthaul links. Each of the RUs 340 may communicate with one or more UEs 120 via respective RF access links. In some deployments, a UE 120 may be simultaneously served by multiple RUs 340.

[0078] Each of the components of the disaggregated base station architecture 300, including the CUs 310, the DUs 330, the RUs 340, the Near-RT RICs 370, the Non-RT RICs 350, and the SMO Framework 360, may include one or more interfaces or may be coupled with one or more interfaces for receiving or transmitting signals, such as data or information, via a wired or wireless transmission medium.

[0079] In some aspects, the CU 310 may be logically split into one or more CU user plane (CU-UP) units and one or more CU control plane (CU-CP) units. A CU-UP unit may communicate bidirectionally with a CU-CP unit via an interface, such as the El interface when implemented in an O-RAN configuration. The CU 310 may be deployed to communicate with one or more DUs 330, as necessary, for network control and signaling. Each DU 330 may correspond to a logical unit that includes one or more base station functions to control the operation of one or more RUs 340. For example, a DU 330 may host various layers, such as an RLC layer, a MAC layer, or one or more PHY layers, such as one or more high PHY layers or one or more low PHY layers. Each layer (which also may be referred to as a module) may be implemented with an interface for communicating signals with other layers (and modules) hosted by the DU 330, or for communicating signals with the control functions hosted by the CU 310. Each RU 340 may implement lower layer functionality. In some aspects, real-time and non-real-time aspects of control and user plane communication with the RU(s) 340 may be controlled by the corresponding DU 330.

[0080] The SMO Framework 360 may support RAN deployment and provisioning of nonvirtualized and virtualized network elements. For non-virtualized network elements, the SMO Framework 360 may support the deployment of dedicated physical resources for RAN coverage requirements, which may be managed via an operations and maintenance interface, such as an 01 interface. For virtualized network elements, the SMO Framework 360 may interact with a cloud computing platform (such as an open cloud (O-Cloud) platform 390) to perform network element life cycle management (such as to instantiate virtualized network elements) via a cloud computing platform interface, such as an 02 interface. A virtualized network element may include, but is not limited to, a CU 310, a DU 330, an RU 340, a non-RT RIC 350, and / or a Near-RT RIC 370. In some aspects, the SMO Framework 360 may communicate with a hardware aspect of a 4G RAN, a 5G NR RAN, and / or a 6G RAN, such as an open eNB (O- eNB) 380, via an 01 interface. Additionally, or alternatively, the SMO Framework 360 may communicate directly with each of one or more RUs 340 via a respective 01 interface. In some deployments, this configuration can enable each DU 330 and the CU 310 to be implemented in a cloud-based RAN architecture, such as a vRAN architecture.

[0081] The Non-RT RIC 350 may include or may implement a logical function that enables non-real-time control and optimization of RAN elements and resources, AI / ML workflows including model training and updates, and / or policy-based guidance of applications and / orfeatures in the Near-RT RIC 370. The Non-RT RIC 350 may be coupled to or may communicate with (such as via an Al interface) the Near-RT RIC 370. The Near-RT RIC 370 may include or may implement a logical function that enables near-real-time control and optimization of RAN elements and resources via data collection and actions via an interface (such as via an E2 interface) connecting one or more CUs 310, one or more DUs 330, and / or an O-eNB with the Near-RT RIC 370.

[0082] In some aspects, to generate AI / ML models to be deployed in the Near-RT RIC 370, the Non-RT RIC 350 may receive parameters or external enrichment information from external servers. Such information may be utilized by the Near-RT RIC 370 and may be received at the SMO Framework 360 or the Non-RT RIC 350 from non -network data sources or from network functions. In some examples, the Non-RT RIC 350 or the Near-RT RIC 370 may tune RAN behavior or performance. For example, the Non-RT RIC 350 may monitor long-term trends and patterns for performance and may employ AI / ML models to perform corrective actions via the SMO Framework 360 (such as reconfiguration via an 01 interface) or via creation of RAN management policies (such as Al interface policies).

[0083] The network node 110, the controller / processor 240 of the network node 110, the UE 120, the controller / processor 280 of the UE 120, the CU 310, the DU 330, the RU 340, or any other component s) of Figs. 1, 2, or 3 may implement one or more techniques or perform one or more operations associated with cyclic prefix extension design for joint collision protection of sidelink positioning reference signal transmissions in shared bands, as described in more detail elsewhere herein. For example, the controller / processor 240 of the network node 110, the controller / processor 280 of the UE 120, any other component(s) of Fig. 2, the CU 310, the DU 330, or the RU 340 may perform or direct operations of, for example, process 900 of Fig. 9, or other processes as described herein (alone or in conjunction with one or more other processors). The memory 242 may store data and program codes for the network node 110, the network node 110, the CU 310, the DU 330, or the RU 340. The memory 282 may store data and program codes for the UE 120. In some examples, the memory 242 or the memory 282 may include a non-transitory computer-readable medium storing a set of instructions (for example, code or program code) for wireless communication. The memory 242 may include one or more memories, such as a single memory or multiple different memories (of the same type or of different types). The memory 282 may include one or more memories, such as a single memory or multiple different memories (of the same type or of different types). For example, the set of instructions, when executed (for example, directly, or after compiling, converting, or interpreting) by one or more processors of the network node 110, the UE 120, the CU 310, the DU 330, or the RU 340, may cause the one or more processors to perform process 900 of Fig. 9, or other processes as described herein. In some examples, executing instructions may includerunning the instructions, converting the instructions, compiling the instructions, and / or interpreting the instructions, among other examples.

[0084] In some aspects, a UE includes means for receiving a set of CPE values associated with a side link location service session; and / or means for transmitting an SL-PRS based at least in part on a CPE value selected from the set of CPE values associated with the sidelink location service session. The means for the UE to perform operations described herein may include, for example, one or more of communication manager 140, antenna 252, modem 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, controller / processor 280, or memory 282.

[0085] As indicated above, Fig. 3 is provided as an example. Other examples may differ from what is described with regard to Fig. 3.

[0086] Fig. 4 is a diagram illustrating an example 400 of sidelink communications, in accordance with the present disclosure.

[0087] As shown in Fig. 4, a first UE 405-1 may communicate with a second UE 405-2 (and one or more other UEs 405) via one or more sidelink channels 410. The UEs 405-1 and 405-2 may communicate using the one or more side link channels 410 for P2P communications, D2D communications, V2X communications (e.g., which may include V2V communications, V2I communications, and / or V2P communications) and / or mesh networking. In some aspects, the UEs 405 (e.g., UE 405-1 and / or UE 405-2) may correspond to one or more other UEs described elsewhere herein, such as UE 120. In some aspects, the one or more sidelink channels 410 may use a PC5 interface and / or may operate in a high frequency band (e.g., the 5.9 GHz band). Additionally, or alternatively, the UEs 405 may synchronize timing of transmission time intervals (TTIs) (e.g., frames, subframes, slots, or symbols) using global navigation satellite system (GNSS) timing.

[0088] As further shown in Fig. 4, the one or more sidelink channels 410 may include a physical sidelink control channel (PSCCH) 415, a physical sidelink shared channel (PSSCH) 420, and / or a physical sidelink feedback channel (PSFCH) 425. The PSCCH 415 may be used to communicate control information, similar to a physical downlink control channel (PDCCH) and / or a physical uplink control channel (PUCCH) used for cellular communications with a network node 110 via an access link or an access channel. The PSSCH 420 may be used to communicate data, similar to a physical downlink shared channel (PDSCH) and / or a physical uplink shared channel (PUSCH) used for cellular communications with a network node 110 via an access link or an access channel. For example, the PSCCH 415 may carry SCI 430, which may indicate various control information used for sidelink communications, such as one or more resources (e.g., time resources, frequency resources, and / or spatial resources) where a transport block (TB) 435 may be carried on the PSSCH 420. The TB 435 may include data. The PSFCH425 may be used to communicate sidelink feedback 440, such as hybrid automatic repeat request (HARQ) feedback (e.g., acknowledgement or negative acknowledgement (ACK / NACK) information), transmit power control (TPC), and / or a scheduling request (SR).

[0089] Although shown on the PSCCH 415, in some aspects, the SCI 430 may include multiple communications in different stages, such as a first stage SCI (SCI-1) and a second stage SCI (SCI-2). The SCI-1 may be transmitted on the PSCCH 415. The SCI-2 may be transmitted on the PSSCH 420. The SCI-1 may include, for example, an indication of one or more resources (e.g., time resources, frequency resources, and / or spatial resources) on the PSSCH 420, information for decoding sidelink communications on the PSSCH, a quality of service (QoS) priority value, a resource reservation period, a PSSCH demodulation reference signal (DMRS) pattern, an SCI format for the SCI-2, a beta offset for the SCI-2, a quantity of PSSCH DMRS ports, and / or an MCS. The SCI-2 may include information associated with data transmissions on the PSSCH 420, such as a hybrid automatic repeat request (HARQ) process ID, a new data indicator (NDI), a source identifier, a destination identifier, and / or a channel state information (CSI) report trigger.

[0090] In some aspects, the one or more sidelink channels 410 may use resource pools. For example, a scheduling assignment (e.g., included in SCI 430) may be transmitted in subchannels using specific resource blocks (RBs) across time. In some aspects, data transmissions (e.g., on the PSSCH 420) associated with a scheduling assignment may occupy adjacent RBs in the same subframe as the scheduling assignment (e.g., using frequency division multiplexing). In some aspects, a scheduling assignment and associated data transmissions are not transmitted on adjacent RBs.

[0091] In some aspects, a UE 405 may operate using a sidelink transmission mode (e.g., Mode 1) where resource selection and / or scheduling is performed by a network node 110 (e.g., a base station, a CU, or a DU). For example, the UE 405 may receive a grant (e.g., in downlink control information (DCI) or in a radio resource control (RRC) message, such as for configured grants) from the network node 110 (e.g., directly or via one or more network nodes) for sidelink channel access and / or scheduling. In some aspects, a UE 405 may operate using a transmission mode (e.g., Mode 2) where resource selection and / or scheduling is performed by the UE 405 (e.g., rather than a network node 110). In some aspects, the UE 405 may perform resource selection and / or scheduling by sensing channel availability for transmissions. For example, the UE 405 may measure a received signal strength indicator (RS SI) parameter (e.g., a sidelink- RSSI (S-RSSI) parameter) associated with various sidelink channels, may measure an RSRP parameter (e.g., a PSSCH-RSRP parameter) associated with various sidelink channels, and / or may measure a reference signal received quality (RSRQ) parameter (e.g., a PSSCH-RSRQ parameter) associated with various sidelink channels, and may select a channel for transmission of a sidelink communication based at least in part on the measurement(s).

[0092] Additionally, or alternatively, the UE 405 may perform resource selection and / or scheduling using SCI 430 received in the PSCCH 415, which may indicate occupied resources and / or channel parameters. Additionally, or alternatively, the UE 405 may perform resource selection and / or scheduling by determining a channel busy ratio (CBR) associated with various sidelink channels, which may be used for rate control (e.g., by indicating a maximum number of resource blocks that the UE 405 can use for a particular set of subframes).

[0093] In the transmission mode where resource selection and / or scheduling is performed by a UE 405, the UE 405 may generate sidelink grants, and may transmit the grants in SCI 430. A sidelink grant may indicate, for example, one or more parameters (e.g., transmission parameters) to be used for an upcoming sidelink transmission, such as one or more resource blocks to be used for the upcoming sidelink transmission on the PSSCH 420 (e.g., for TBs 435), one or more subframes to be used for the upcoming sidelink transmission, and / or an MCS to be used for the upcoming sidelink transmission. In some aspects, a UE 405 may generate a sidelink grant that indicates one or more parameters for semi-persistent scheduling (SPS), such as a periodicity of a sidelink transmission. Additionally, or alternatively, the UE 405 may generate a sidelink grant for event-driven scheduling, such as for an on-demand sidelink message.

[0094] As indicated above, Fig. 4 is provided as an example. Other examples may differ from what is described with respect to Fig. 4.

[0095] Fig. 5 is a diagram illustrating an example 500 of sidelink communications and access link communications, in accordance with the present disclosure.

[0096] As shown in Fig. 5, a transmitter (Tx)Zreceiver (Rx) UE 505 and an Rx / Tx UE 510 may communicate with one another via a sidelink, as described above in connection with Fig. 4. As further shown, in some sidelink modes, a network node 110 may communicate with the Tx / Rx UE 505 (e.g., directly or via one or more network nodes), such as via a first access link. Additionally, or alternatively, in some sidelink modes, the network node 110 may communicate with the Rx / Tx UE 510 (e.g., directly or via one or more network nodes), such as via a first access link. The Tx / Rx UE 505 and / or the Rx / Tx UE 510 may correspond to one or more UEs described elsewhere herein, such as the UE 120 of Fig. 1. Thus, a direct link between UEs 120 (e.g., via a PC5 interface) may be referred to as a sidelink, and a direct link between a network 110 and a UE 120 (e.g., via a Uu interface) may be referred to as an access link. Sidelink communications may be transmitted via the sidelink, and access link communications may be transmitted via the access link. An access link communication may be either a downlink communication (from a network node 110 to a UE 120) or an uplink communication (from a UE 120 to a network node 110).

[0097] As indicated above, Fig. 5 is provided as an example. Other examples may differ from what is described with respect to Fig. 5.

[0098] Fig. 6 is a diagram illustrating an example 600 of utilizing CPEs to avoid collisions over a side link communication channel, in accordance with the present disclosure.

[0099] In some cases, a wireless communication device (e.g., a UE 120) may be configured to prepend a CPE to a communication transmitted via a sidelink over a shared (e.g., unlicensed) band. The CPE may be prepended to the communication to fill and / or reduce inactivity gaps, ease channel access (e.g., by blocking other wireless communication devices from accessing the sidelink channel), and / or to avoid collisions among wireless communication devices attempting to access the sidelink channel at a same slot. For example, a sidelink transmission may be a wideband sidelink transmission, and two or more wireless communication devices attempting to perform a wideband transmission over the same slot may be likely to collide.

[0100] As shown in Fig. 6, a first UE (e.g., UE1, as shown in Fig. 6) may determine to perform a sidelink transmission over a slot (indicated at time (T) in Fig. 6) of a shared band. In some cases, the first UE may determine that the slot has not been reserved by another UE. For example, the first UE may determine that the first UE has not received SCI indicating that another UE intends to perform a transmission over the slot.

[0101] In some cases, the first UE may select a CPE value from a set of CPE values. For example, the first UE may receive (e.g., from a network node 110 and / or another UE) an indication of a set of CPE values (e.g., a set of CPE values configured for a resource pool associated with the sidelink transmission) and / or may be configured with a set of CPE values (e.g., a set of CPE values specified in a wireless communication standard).

[0102] In some cases, the CPE value may comprise a CPE duration value. For example, the CPE value may indicate a duration (e.g., a period of time over which a CPE is transmitted), a size, and / or a length of a CPE.

[0103] In some cases, the CPE value may comprise a CPE starting position (e.g., a value indicating a starting position associated with transmitting a CPE). For example, the CPE value may indicate an amount of time prior to transmitting the sidelink communication, a quantity of resources prior to a resource via which the first UE is to start transmitting a CPE, and / or a resource via which the first UE is to start transmitting a CPE.

[0104] As shown by reference number 605, prior to the slot, the first UE may perform an access procedure to determine whether the sidelink channel is available for the sidelink transmission. For example, the first UE may perform an LBT procedure, as described elsewhere herein.

[0105] In some cases, the first UE may sense interference indicating that the sidelink channel is not available for the sidelink transmission (e.g., interference indicating that another UE iscurrently transmitting data via the sidelink channel). In these cases, the first UE may select another slot for transmitting the sidelink communication.

[0106] In some cases, the UE may determine that the sidelink channel is currently available for transmitting the sidelink communication. For example, the UE may determine that a level of interference sensed by the first UE satisfies (e.g., is less than) a threshold amount of interference. In these cases, the first UE may transmit the sidelink transmission 615 according to the selected CPE value 610.

[0107] For example, the first UE may determine a duration and / or a starting position based at least in part on the CPE value 610. The first UE may transmit the CPE 610 based at least in part on the duration and / or the starting position. The first UE may transmit the sidelink transmission 615 based at least in part on transmitting the CPE.

[0108] In some cases, a second UE (e.g., UE2, as shown in Fig. 6) may determine to transmit a sidelink communication over the same slot. The second UE may select a CPE value from the set of CPE values in a manner similar to that described above with respect to UE1.

[0109] As shown by reference number 620, the CPE value selected by the second UE may be a shorter CPE value relative to the CPE value selected by the first UE. As shown by reference number 625, the second UE may perform an LBT procedure to determine whether the sidelink channel is available for transmitting the sidelink communication.

[0110] The second UE may sense interference corresponding to the transmission of the CPE by the first UE. The second UE may determine that the sidelink channel is not available for transmitting the sidelink communication based at least in part on sensing the interference and may cancel the sidelink transmission. The second UE may select a subsequent slot for transmitting the sidelink communication based at least in part on cancelling the sidelink transmission.[OHl] In this way, CPE values may provide a per transmission collision protection for sidelink communications over a shared band.

[0112] As indicated above, Fig. 6 is provided as an example. Other examples may differ from what is described with respect to Fig. 6.

[0113] Fig. 7 is a diagram illustrating an example 700 of sidelink positioning and location service sessions involving multiple transmitting UEs, in accordance with the present disclosure.

[0114] Sidelink positioning use cases may involve multiple transmitting UEs cooperating as part of a sidelink location service (LCS) session. For example, to perform a time difference of arrival (TDOA)-based positioning technique, multiple transmitting (e.g., “anchor”) UEs may each transmit a sidelink positioning reference signal (SL-PRS) during a sidelink LCS session.

[0115] To avoid positioning errors due to mobility and / or clock drifts, the SL-PRS transmissions from all transmitting UEs included in the sidelink LCS session should beperformed as close in time as possible. To achieve a required degree of “closeness” of the SL- PRS transmissions, a sidelink LCS time window may be configured for the sidelink LCS session. For example, the sidelink LCS time window may comprise a quantity of slots, subslots, and / or the like over which the transmitting UE’s are to perform the SL-PRS transmissions. The sidelink LCS time window may comprise a relatively short time period (e.g., 1 slot, 3 subslots, and / or 4 slots, among other examples) over which the transmitting UEs independently select resources to perform the SL-PRS transmissions.

[0116] In some cases, the sidelink LCS time window may be indicated by a delay budget for SL-PRS that is provided by higher layers (e.g., a network node 110). The delay budget may correspond to a time period starting at a time at which the transmitting UEs are triggered to select a resource and continuing for an amount of time equal to the delay budget. In some cases, transmitting UEs included in the same sidelink LCS session may be triggered to select a resource at different times and with appropriate delay budgets to reduce a likelihood of the transmitting UEs from selecting overlapping resources and / or to avoid intra-sidelink LCS session collisions.

[0117] To achieve a high range resolution, the SL-PRSs may comprise a wideband transmission. However, the wideband transmissions of SL-PRSs may increase a collision rate among SL-PRSs and / or with other sidelink transmissions.

[0118] In some cases, to avoid collisions between SL-PRSs and other sidelink communications, a network may configure a resource pool dedicated to SL-PRSs transmissions. Additionally, CPEs may be used to reduce collisions among SL-PRSs in a manner similar to that described above with respect to Fig. 6.

[0119] However, the collision avoidance protection provided by using CPEs in a manner similar to that described with respect to Fig. 6 is on a per transmission basis. Stated differently, each transmission is protected individually by utilizing CPE and does not provide collision avoidance protection for a group of transmissions originating from the same UE or across different UEs.

[0120] For example, as shown in Fig. 7, a first UE (e.g., UE1, as shown in Fig. 7) and a second UE (e.g., UE2, as shown in Fig. 7) may participate in a first sidelink LCS session (e.g., LCS1, as shown in Fig. 7). Additionally, a third UE (e.g., UE3, as shown in Fig. 7) and a fourth UE (e.g., UE4, as shown in Fig. 7) may participate in a second sidelink LCS session (e.g., LCS2, as shown in Fig. 7).

[0121] The first UE and the second UE may receive a first indication of a first sidelink LCS time window (e.g., LCS1 time window, as shown in Fig. 7). Similarly, the third UE and the fourth UE may receive a second indication of a second sidelink LCS time window (e.g., LCS2 time window, as shown in Fig. 7).

[0122] In some cases, each of the UEs may select a resource (e.g., a time resource and / or a frequency resource) for transmitting respective SL-PRSs. As shown in Fig. 7, the first UE and the fourth UE may select a first slot (indicated by reference number 705) for transmitting a first SL-PRS and a fourth SL-PRS, respectively, and the second UE and the third UE may select a second slot (indicated by reference number 710) for transmitting a second SL-PRS and a third SL-PRS, respectively.

[0123] In some cases, each of the UEs may select a CPE value from a same and / or different set of CPE values. For example, as shown in Fig. 7, the first UE may select a first CPE value (indicated by reference number 715), the second UE may select a second CPE value (indicated by reference number 720), the third UE may select a third CPE value (indicated by reference number 725), and the fourth UE may select a fourth CPE value (indicated by reference number 730).

[0124] As shown by reference number 735, the first UE may perform an access procedure (e.g., an LBT procedure) to determine whether the sidelink channel is available for transmitting the first SL-PRS. Based on the first CPE value being larger than the fourth CPE value, the first UE may determine that the sidelink channel is available and may transmit the first SL-PRS in accordance with the first CPE.

[0125] As shown by reference number 740, the fourth UE may perform an access procedure (e.g., an LBT procedure) to determine whether the sidelink channel is available for transmitting the fourth SL-PRS. Based on the first CPE value being larger than the fourth CPE value, the fourth UE may determine that the sidelink channel is not available (e.g., the fourth UE may sense the transmission of the first CPE by the first UE) and may cancel the transmission of the fourth SL-PRS.

[0126] In some cases, the fourth UE may select the second slot for transmitting the fourth SL-PRS. Based on the third CPE value being larger than the fourth CPE value, the fourth UE may determine that the sidelink channel is not available (e.g., the fourth UE may sense the transmission of the third CPE by the third UE) and may cancel the transmission of the fourth SL-PRS.

[0127] In some cases, the fourth UE may select a third slot (indicated by reference number 745) for transmitting the fourth SL-PRS. The fourth UE may determine that the third slot is outside of the second LCS time window and may cancel the transmission of the fourth SL-PRS. In some cases, the second sidelink LCS session may be invalid and / or may need to be reperformed based at least in part on the fourth UE canceling the transmission of the fourth SL- PRS.

[0128] Similarly, the second UE may select the second slot for transmitting the second SL- PRS. Based on the third CPE value being larger than the second CPE value, the fourth UE maydetermine that the side link channel is not available (e.g., the second UE may sense the transmission of the third CPE by the third UE) and may cancel the transmission of the second SL-PRS.

[0129] In some cases, the second UE may select the third slot for transmitting the second SL- PRS. The second UE may determine that the third slot is outside of the first LCS time window and may cancel the transmission of the second SL-PRS. In some cases, the first sidelink LCS session may be invalid and / or may need to be re-performed based at least in part on the second UE canceling the transmission of the second SL-PRS.

[0130] As indicated above, Fig. 7 is provided as an example. Other examples may differ from what is described with respect to Fig. 7.

[0131] Fig. 8 is a diagram illustrating an example 800 associated with a CPE design for joint collision protection of SL-PRS transmission in shared bands, in accordance with the present disclosure. As shown in Fig. 8, example 800 includes a first UE (UE1) and a second UE (UE2) participating in a first sidelink LCS session (LCS 1) and a third UE (UE3) and a fourth UE (UE4) participating in a second side link LCS session (LCS2).

[0132] In some aspects, the first UE and the second UE may receive first session information associated with the first sidelink LCS session. In some aspects, one or more portions of the first session information may be received during a formation of the first sidelink LCS session, during a discovery phase of the first sidelink LCS session, and / or after establishment of the first sidelink LCS session (e.g., indicated in an cissistcinceDcita control element transmitted to the transmitting UEs (e.g., the first UE and / or the second UE)).

[0133] In some aspects, the first session information may indicate one or more wireless communication devices associated with the first sidelink LCS session. For example, the first session information may indicate an identifier (e.g., a respective device identifier associated with each wireless communication device, a group identifier associated with a group of wireless communication devices, and / or another type of identifier).

[0134] In some aspects, the first session information may indicate a session identifier associated with the first sidelink LCS session. The session identifier may comprise a series of one or more bits that uniquely identifies the first sidelink LCS session.

[0135] In some aspects, the first session information may indicate a resource pool associated with the first sidelink LCS session. In some aspects, the resource pool may comprise a sub-set (e.g., less than all) of a set of resources allocated for transmitting sidelink communications.

[0136] In some aspects, the first session information may indicate a session-specific set of CPE values. In some aspects, the first session information may explicitly indicate the sessionspecific set of CPE values.

[0137] In some aspects, the session-specific set of CPE values may not be included in the first session information. For example, the session-specific set of CPE values may be (pre-) configured or pre-defined.

[0138] In some aspects, the session-specific set of CPE values may be determined based at least in part on an SCS associated with the side link communication. For example, for 15 kilohertz (kHz) SCS, the session-specific set of CPE values may comprise {Tsymj + 16 ps, Tsym + 25 p.S . Tsymj + 3 p.S. Tsymj + 43 p.S. Tsymj + 52 p.S. Tymj + 61 .S. T sym O } - whCTC T sym O IS the starting position of the next automatic gain control (AGC) symbol and Tsymj is the starting position of the first symbol just before the next AGC symbol.

[0139] As another example, for 30 kHz SCS, the session-specific set of CPE values for a sidelink LCS time window of one (1) symbol length may comprise {Tsymj + 16 ps, Tsymj + 25 p.s. Tsym o }. For a sidelink LCS time window of two (2) symbols length, the session-specific set of CPE values may comprise+ 52 p.s. Tsym_2 + 61 p.s. Tsym_o }, where Tsymj is the starting position of the second symbol just before the next AGC symbol.

[0140] As another example, for 60 kHz SCS, the session-specific set of CPE values for a sidelink LCS time window of one (1) symbol length may comprise {Tsymj + 16 p.s. Tsymj) }. For a sidelink LCS time window of two (2) symbols length, the session-specific set of CPE values may comprise {Tsymj + 16 p.s. Tsymj + 25 p.s. Tsym ) } -

[0141] In some aspects, the first session information may implicitly indicate the sessionspecific set of CPE values. For example, the first session information may include information associated with a rule and / or a mapping and the first UE and / or the second UE may determine the session-specific set of CPE values based at least in part on the information, the rule, and / or the mapping.

[0142] For example, the first session information may include an index, an identifier (e.g., a session identifier associated with the first sidelink LCS session, an identifier associated with a device (e.g., a network node 110 and / or a UE 120) transmitting the first session information to the first UE and / or the second UE, and / or other information indicating the first sidelink LCS session and / or a device associated with the first sidelink LCS session), a pointer, and / or a value, among other examples, that is mapped to a row and / or a column of a configured table of sets of CPE values.

[0143] In some aspects, the first session information may indicate whether one or more sets of session-specific sets of CPE values are activated for the first sidelink LCS session. In some aspects, the first session information may indicate that the one or more sets of the sessionspecific sets of CPE values are not activated for the first sidelink LCS session and / or that thefirst UE and / or the second UE is to select a CPE value based at least in part on a procedure followed for transmissions occurring outside of a sidelink LCS session.

[0144] In some aspects, the session-specific set of CPE values may be determined based at least in part on a configured set of rules. In some aspects, the session-specific set of CPE values may comprise a session-specific set of out-of-COT CPE values. In some aspects, the sessionspecific set of out-of-COT CPE values may comprise a sub-set of a set of out-of-COT CPE values specified in a wireless communication standard and / or (pre-) configured for the resource pool associated with the first sidelink LCS session. Additionally, or alternatively, the sessionspecific set of CPE values may comprise a session-specific set of in-COT CPE values.

[0145] In some aspects, the session-specific set of CPE values may comprise a single CPE value. In some aspects, the session-specific set of CPE values may comprise a plurality of CPE values. For example, the session-specific set of CPE values may comprise a plurality of CPE values to reduce a likelihood and / or prevent intra-session collisions among SL-PRS transmissions during the first sidelink LCS session.

[0146] In some aspects, the first session information may indicate a method for selecting a CPE value from the plurality of CPE values included in the session-specific set of CPE values. For example, the first session information may indicate that that a CPE value is to be randomly selected from the plurality of CPE values, selected based at least in part on a priority associated with the first sidelink LCS session, based at least in part on whether a physical sidelink control channel (PSCCH) immediately follows an AGC symbol, based at least in part on whether interference is detected within a gap between the AGC symbol and the PSCCH associated with the SL-PRS, and / or based at least in part on a slot selected for transmission of a SL-PRS, among other examples.

[0147] In some aspects, the first session information may indicate a default CPE value. For example, the first session information may indicate a default CPE value to be used when a transmitting UE (e.g., the first UE and / or the second UE) selects a resource over a slot for which a resource reservation was transmitted or detected. In some aspects, the default CPE may be used to enable frequency division multiplexing (FDM) to be used for the transmissions (e.g., a SL-PRS and a transmission associated with the resource reservation).

[0148] In some aspects, the first UE or the second UE may comprise a server UE for the first sidelink LCS session. The first UE or the second UE may select the session-specific set of CPE values based at least in part on being the server UE for the first sidelink LCS session.

[0149] In some aspects, the sever UE (e.g., the first UE or the second UE) may select the session-specific set of CPE values based at least in part on a set of criteria, rules, and / or network conditions, among other examples.

[0150] In some aspects, the server UE may select the session-specific set of CPE values based at least in part on sets of CPE values used by other sidelink LCS sessions. For example, SCI associated with SL-PRS transmissions from another sidelink LCS session (e.g., the second sidelink LCS session) may indicate a set of CPE values used by the other sidelink LCS session.

[0151] In some aspects, the server UE may select the session-specific set of CPE values to minimize a number of CPE values used by other sidelink LCS sessions. For example, the server UE may select CPE values that are not indicated in any SCI received by the server UE. In some aspects, the server UE may select CPE values that are not indicated in any SCI received by the server UE within a finite past time window.

[0152] In some aspects, the server UE may select the session-specific set of CPE values based at least in part on a priority associated with the first sidelink LCS session. For example, when the first sidelink LCS session is associated with a first priority, the server UE may select a set of CPE values that are longer CPE relative to a set of CPE values that are selected when the first sidelink LCS session is associated with a second (e.g., low) priority that is a lower priority relative to the first priority. In some aspects, the server UE may select the set of longer CPE values to reduce a likelihood of an SL-PRS transmission being blocked by an SL-PRS transmission of a sidelink LCS session associated with a lower priority.

[0153] In some aspects, the server UE may select the session-specific set of CPE values based at least in part on a duration of the first sidelink LCS time window and / or a delay budget associated for SL-PRS transmissions. For example, the server UE may determine that the duration of the first sidelink LCS time window and / or the delay budget increases (or decreases) a likelihood of a transmitting UE being able to cancel a first SL-PRS transmission (e.g., due to the sidelink channel not being available during an initially selected slot), select a new slot, and transmit the SL-PRS over the new slot within the first sidelink LCS time window and / or in accordance with the delay budget. The server UE may select a session-specific set of shorter CPE values when the likelihood satisfies (e.g., is larger than) a threshold probability. The server UE may select a session-specific set of longer CPE values when the likelihood fails to satisfy the threshold probability.

[0154] In some aspects, the server UE may select the session-specific set of CPE values based at least in part on a number of SL-PRS resources configured in a resource pool associated with the first sidelink LCS session. For example, a likelihood of an occurrence of a collision may be inversely proportional to the number of SL-PRS resources configured in the resource pool (e.g., as the number of SL-PRS resources increases, the likelihood of an occurrence of a collision decreases and as the number of SL-PRS resources decreases, the likelihood of an occurrence of a collision increases).

[0155] In some aspects, the server UE may select the session-specific set of CPE values based at least in part on SL-PRS resource identifiers and / or SL-PRS resources({SL-PRS> ^combRS}) configurations to be used by the transmitting UEs. For example, the server UE may determine a likelihood of resources corresponding to the SL-PRS resource identifiers of utilizing FDM and / or time division multiplexing (TDM) to transmit the SL-PRS with other SL-PRS transmissions.

[0156] In some aspects, the server UE may determine that the resources corresponding to the SL-PRS resources identifiers are likely to utilize FDM and / or TDM based at least in part on a TDM group consisting of a small (e.g., less than a threshold) number of symbols (LSL-PRS) and / or a combination-size (KcombRS) associated with the resources is large (e.g., greater than a threshold). The server UE may select a session-specific set of shorter CPE values based at least in part on the resources being likely to utilize FDM and / or TDM.

[0157] In some aspects, the server UE may select the session-specific set of CPE values based at least in part on a location of a group of UEs associated with another sidelink LCS session. For example, the server UE may not consider a set of CPE values utilized by the other sidelink LCS session as being utilized by the other sidelink LCS session based at least in part a distance between the location of the group of UEs associated with the other sidelink LCS session and a location of the group of UEs associated with the first sidelink LCS session satisfies one or more conditions.

[0158] In some aspects, the one or more conditions may include whether an RSRP of a PSCCH associated with the other sidelink LCS session satisfies (e.g., is greater than) a (pre-) configured threshold. For example, the server UE may not consider a set of CPE values utilized by the other sidelink LCS session as being utilized by the other sidelink LCS session when the RSRP satisfies the threshold.

[0159] In some aspects, SCI transmitted by a wireless communication device included in the other sidelink LCS session may include location information (e.g., a zone identifier) associated with the other sidelink LCS session. The server UE may determine whether a distance between the server UE and a location corresponding to the location information satisfies (e.g., is greater than) a (pre-) configured threshold. The server UE may not consider a set of CPE values utilized by the other sidelink LCS session as being utilized by the other sidelink LCS session when the distance satisfies the threshold.

[0160] In some aspects, the third UE and the fourth UE may receive second session information associated with the second sidelink LCS session. In some aspects, the second session information may include information associated with establishing the second sidelink LCS session. For example, the second session information may include and / or indicateinformation corresponding to the information included in and / or indicated by the first session information.

[0161] In some aspects, one or more portions of the second session information may be different from and / or the same as one or more corresponding portions of the first session information. For example, the second information may indicate a session identifier associated with the second sidelink LCS session that is different from the session identifier associated with the first sidelink LCS session.

[0162] In some aspects, the sidelink LCS time window associated with the second SL-PRS (e.g., the LCS2 time window, as shown in Fig. 8) may be the same as, or different from, the sidelink LCS time window associated with the first SL-PRS. For example, a duration of the sidelink LCS time window associated with the second sidelink LCS session may be the same as, or different from, a duration of the sidelink LCS time window associated with the first sidelink LCS session, a delay budget associated with the second sidelink LCS session may be the same as, or different from, a delay budget associated with the first sidelink LCS session, and / or a starting point of the sidelink LCS time window associated with the second sidelink LCS session may be the same as, or different from, a starting point of the sidelink LCS time window associated with the first sidelink LCS session.

[0163] In some aspects, one or more (e.g., all) wireless communication devices indicated in the second session information may be different from one or more wireless communication devices indicated in the first session information. In some aspects, one or more wireless communication devices indicated in the second session information may be the same as one or more wireless communication devices indicated in the first session information. For example, a same device (e.g., a network node 110 and / or a UE 120) may initiate and / or configure the first sidelink LCS session and the second sidelink LCS session, receive the SL-PRS transmissions from each of the wireless communication devices, determine position information for one or more wireless communication devices, and / or receive position information determined based on the SL-PRS transmissions, among other examples.

[0164] In some aspects, the first UE may select a slot for transmitting a first SL-PRS based at least in part on receiving the session information.

[0165] In some aspects, the first UE may identify a group of slots included in the first sidelink LCS time window. For example, the first UE may identify one or more slots, of the group of slots included in the first sidelink LCS time window that have been identified in SCI received or detected by the first UE. In some aspects, the first UE may identify set one or more remaining slots for which no resource reservation was transmitted or detected and may select a slot (e.g., a slot indicated by reference number 805 in Fig. 8), from the set of one or more remaining slots, for transmitting the first SL-PRS.

[0166] In some aspects, the first UE may select a CPE value from the session-specific set of CPE values based at least in part on selecting the slot. In some aspects, the first UE may select the CPE value (indicated by reference number 810 in Fig. 8) based at least in part on the first session information. For example, the first UE may select the CPE value in a manner similar to that described above.

[0167] In some aspects, the first UE may perform an access procedure (e.g., an LBT procedure) to determine whether the slot is available for transmitting an SL-PRS. For example, the first UE may perform an access procedure to determine whether the slot is available for transmitting the SL-PRS in a manner similar to that described elsewhere herein.

[0168] In some aspects, the first UE may determine that the slot is available for transmitting the SL-PRS. The first UE may transmit the SL-PRS over the selected slot and according to the selected CPE.

[0169] In some aspects, the second UE may select a slot (indicated by reference number 815 in Fig. 8) for transmitting an SL-PRS based at least in part on receiving the first session information. For example, the second UE may select a slot in a manner similar to that described elsewhere herein.

[0170] In some aspects, the second UE may select a CPE value (indicated by reference number 820 in Fig. 8) from the session-specific set of CPE values based at least in part on selecting the slot. For example, the second UE may select a CPE value from the sessionspecific set of CPE values in a manner similar to that described elsewhere herein.

[0171] In some aspects, the CPE value selected by the second UE may be the same as the CPE value selected by the first UE. For example, the session-specific set of CPE values may include a single CPE value or the second UE and the first UE may select the same CPE value from the session-specific set of CPE values.

[0172] In some aspects, the CPE value selected by the second UE may be different from the CPE value selected by the first UE. For example, the session-specific set of CPE values may include a plurality of CPE values and the second UE may select (e.g., randomly select) a CPE value from the plurality of CPE values that is different from the CPE value selected (e.g., randomly selected) by the first UE.

[0173] In some aspects, the second UE may perform an access procedure (e.g., an LBT procedure) to determine whether the slot is available for transmitting an SL-PRS. For example, the second UE may perform an access procedure to determine whether the slot is available for transmitting the SL-PRS in a manner similar to that described elsewhere herein.

[0174] In some aspects, the second UE may determine that the slot is available for transmitting the SL-PRS. The second UE may transmit the SL-PRS over the selected slot and according to the selected CPE. In some aspects, the transmission of the SL-PRS by the first UEand the transmission of the SL-PRS by the second UE may complete and / or validate the first sidelink LCS session.

[0175] In some aspects, the fourth UE may select a slot (indicated by reference number 805 in Fig. 8) for transmitting an SL-PRS based at least in part on receiving the second session information. For example, the fourth UE may select a slot in a manner similar to that described elsewhere herein. In some aspects, as shown in Fig. 8, the slot selected by the fourth UE may be the same as the slot selected by the first UE.

[0176] In some aspects, the fourth UE may select a CPE value (indicated by reference number 825 in Fig. 8) from the session-specific set of CPE values based at least in part on selecting the slot. For example, the fourth UE may select a CPE value from the session-specific set of CPE values in a manner similar to that described elsewhere herein.

[0177] In some aspects, the CPE value selected by the fourth UE may be smaller than the CPE value selected by the first UE. In some aspects, the fourth UE may perform an access procedure (e.g., an LBT procedure) to determine whether the slot is available for transmitting an SL-PRS. For example, the fourth UE may perform an access procedure to determine whether the slot is available for transmitting the SL-PRS in a manner similar to that described elsewhere herein.

[0178] In some aspects, the fourth UE may determine that the slot is not available for transmitting an SL-PRS. For example, the fourth UE may detect interference corresponding to the transmission of the CPE by the first UE based at least in part on the CPE selected by the fourth CPE being shorter than the CPE selected by the first UE. In some aspects, the fourth UE may cancel the transmission of the SL-PRS based at least in part on determining that the slot is not available.

[0179] In some aspects, the fourth UE may select a subsequent slot (indicated by reference number 815 in Fig. 8) for transmitting an SL-PRS based at least in part on canceling the transmission of the initial SL-PRS. As shown in Fig. 8, the slot selected by the fourth UE may be the same as the slot selected by the second UE.

[0180] In some aspects, the fourth UE may select a new CPE value based at least in part on selecting the subsequent slot. In some aspects, the fourth UE may determine to use the previously selected CPE value and / or may select (e.g., randomly select) the same CPE value as previously selected by the fourth UE.

[0181] In some aspects, the fourth UE may determine whether the subsequent slot is available for transmitting an SL-PRS. For example, the fourth UE may perform an access procedure to determine whether the subsequent slot is available for transmitting the SL-PRS in a manner similar to that described elsewhere herein.

[0182] In some aspects, the fourth UE may determine that the subsequent slot is not available for transmitting the SL-PRS. For example, the CPE value selected by the fourth UE may be shorter than the CPE value selected by the second UE and the fourth UE may detect interference corresponding to the transmission of the CPE by the second UE. The fourth UE may determine that the subsequent slot is not available for transmitting the SL-PRS based at least in part on detecting the interference.

[0183] In some aspects, the fourth UE may cancel the transmission of the SL-PRS based at least in part on determining that the subsequent slot is not available for transmission of the SL- PRS. In some aspects, the fourth UE may select a next slot (indicated by reference number 830 in Fig. 8) for transmitting the SL-PRS. The fourth UE may determine that the next slot is not within the second sidelink LCS time window and may cancel the transmission of the SL-PRS. In some aspects, the cancellation of the transmission of the SL-PRS by the fourth UE may cause the second sidelink LCS session to be invalid and / or to be reperformed.

[0184] In some aspects, the third UE may select a slot (indicated by reference number 815 in Fig. 8) for transmitting an SL-PRS based at least in part on receiving the second session information. For example, the third UE may select a slot in a manner similar to that described elsewhere herein. In some aspects, as shown in Fig. 8, the slot selected by the third UE may be the same as the slot selected by the second UE.

[0185] In some aspects, the third UE may select a CPE value (indicated by reference number 835 in Fig. 8) from the session-specific set of CPE values based at least in part on selecting the slot. For example, the third UE may select a CPE value from the session-specific set of CPE values in a manner similar to that described elsewhere herein.

[0186] In some aspects, the CPE value selected by the third UE may be the same as the CPE value selected by the fourth UE. For example, the session-specific set of CPE values may include a single CPE value or the third UE and the fourth UE may select the same CPE value from the session-specific set of CPE values.

[0187] In some aspects, the CPE value selected by the third UE may be different from the CPE value selected by the fourth UE. For example, the session-specific set of CPE values may include a plurality of CPE values and the third UE may select (e.g., randomly select) a CPE value from the plurality of CPE values that is different from the CPE value selected (e.g., randomly selected) by the fourth UE.

[0188] In some aspects, the CPE value selected by the third UE may be smaller than the CPE value selected by the second UE. In some aspects, the third UE may perform an access procedure (e.g., an LBT procedure) to determine whether the slot is available for transmitting an SL-PRS. For example, the third UE may perform an access procedure to determine whether theslot is available for transmitting the SL-PRS in a manner similar to that described elsewhere herein.

[0189] In some aspects, the third UE may determine that the slot is not available for transmitting an SL-PRS. For example, the third UE may detect interference corresponding to the transmission of the CPE by the second UE based at least in part on the CPE selected by the third CPE being shorter than the CPE selected by the second UE. In some aspects, the third UE may cancel the transmission of the SL-PRS based at least in part on determining that the slot is not available.

[0190] In some aspects, the fourth UE may select a subsequent slot (indicated by reference number 840 in Fig. 8) for transmitting an SL-PRS based at least in part on canceling the transmission of the initial SL-PRS.

[0191] In some aspects, the third UE may select a new CPE value based at least in part on selecting the subsequent slot. In some aspects, the third UE may determine to use the previously selected CPE value and / or may select (e.g., randomly select) the same CPE value as previously selected by the third UE.

[0192] In some aspects, the third UE may determine that the subsequent slot is not within the second side link LCS time window and may cancel the transmission of the SL-PRS. In some aspects, the cancellation of the transmission of the SL-PRS by the third UE (either by itself or in conjunction with the cancellation of the transmission of the SL-PRS by the fourth UE) may cause the second sidelink LCS session to be invalid and / or to be reperformed.

[0193] As described herein, utilizing session-specific sets of CPE values reduces a likelihood of both sidelink LCS sessions being invalidated.

[0194] As indicated above, Fig. 8 is provided as an example. Other examples may differ from what is described with respect to Fig. 8.

[0195] Fig. 9 is a diagram illustrating an example process 900 performed, for example, at a UE or an apparatus of a UE, in accordance with the present disclosure. Example process 900 is an example where the apparatus or the UE (e.g., UE 120) performs operations associated with CPE design for joint collision protection of SL-PRS transmissions in shared bands.

[0196] As shown in Fig. 9, in some aspects, process 900 may include receiving a set of CPE starting positions specific to a sidelink location service session (block 910). For example, the UE (e.g., using reception component 1002 and / or communication manager 1006, depicted in Fig. 10) may receive a set of CPE starting positions specific to a sidelink location service session, as described above, e.g., in connection with receiving session information or Figs. 6 and 8.

[0197] As further shown in Fig. 9, in some aspects, process 900 may include transmitting, within a first location service session time window, an SL-PRS based at least in part on a CPEstarting position selected from the set of CPE starting positions specific to the sidelink location service session, wherein the CPE starting position corresponds to a same CPE starting position for all transmissions performed for the side link location service session, and wherein the CPE starting position is different from CPE starting positions for one or more other sidelink location service sessions comprising a second location service session time window that at least partially overlaps with the first location service session time window (block 920). For example, the UE (e.g., using transmission component 1004 and / or communication manager 1006, depicted in Fig. 10) may transmit, within a first location service session time window, an SL-PRS based at least in part on a CPE starting position selected from the set of CPE starting positions specific to the sidelink location service session, wherein the CPE starting position corresponds to a same CPE starting position for all transmissions performed for the sidelink location service session, and wherein the CPE starting position is different from CPE starting positions for one or more other sidelink location service sessions comprising a second location service session time window that at least partially overlaps with the first location service session time window, as described above, e.g., in connection with selecting a resource included in a sidelink LCS time window or Fig. 8.

[0198] Process 900 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in connection with one or more other processes described elsewhere herein.

[0199] In a first aspect, the sidelink location service session is associated with a plurality of UEs, wherein the plurality of UEs includes the UE, wherein each UE, of the plurality of UEs selects the CPE starting position from the set of CPE starting positions, and wherein each UE, of the plurality of UEs transmits a respective SL-PRS based at least in part on the CPE starting position.

[0200] In a second aspect, alone or in combination with the first aspect, the set of CPE starting positions includes a plurality of CPE starting positions.

[0201] In a third aspect, alone or in combination with one or more of the first and second aspects, the CPE starting position is randomly selected from the set of CPE starting positions.

[0202] In a fourth aspect, alone or in combination with one or more of the first through third aspects, the set of CPE starting positions comprises a sub-set of CPE starting positions included in a set of out-of-COT starting positions specified in a wireless communication standard.

[0203] In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the set of CPE starting positions comprises a sub-set of CPE starting positions included in a set of out-of-COT values configured for a sidelink resource pool associated with the sidelink location service session.

[0204] In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, a resource reservation is associated with a slot selected for transmitting the SL-PRS, and wherein the CPE starting position corresponds to a default CPE.

[0205] In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the CPE starting position is applied to at least an automatic gain control (AGC) symbol preceding a PSCCH associated with the SL-PRS.

[0206] In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, a transmission gap is between an end of the PSCCH and a start of the SL-PRS, the method further comprising detecting whether there is interference within the transmission gap between the SL-PRS and the PSCCH, and randomly selecting a CPE starting position for the SL-PRS or using a same CPE as the PSCCH based at least in part on detecting the interference within the gap, wherein an in-COT CPE is selected if the interference is detected within the gap.

[0207] In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, process 900 includes receiving information indicating the set of CPE starting positions from a network node or another UE.

[0208] In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, the information indicating the set of CPE starting positions is received during formation of the sidelink location service session, during a discovery phase of the sidelink location service session, after establishment of the sidelink location service session, or a combination thereof.

[0209] In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, the set of CPE starting positions is determined according to a sidelink procedure associated with determining the set of CPE starting positions.

[0210] In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, the set of CPE starting positions is determined based at least in part on a rule, a mapping, or a combination thereof.

[0211] In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, process 900 includes receiving information indicating that the set of CPE starting positions is activated for the sidelink location service session, wherein the set of CPE starting positions is determined according to a sidelink procedure associated with determining the set of CPE starting positions when the set of CPE starting positions is not activated for the sidelink location service session.

[0212] In a fourteenth aspect, alone or in combination with one or more of the first through thirteenth aspects, process 900 includes receiving SCI associated with a PSCCH associated with the SL-PRS indicating a CPE starting position associated with another sidelink location service session, the set of CPE starting positions, a session identifier associated with the sidelinklocation service session, a session identifier associated with the other sidelink location service session, or a combination thereof.

[0213] In a fifteenth aspect, alone or in combination with one or more of the first through fourteenth aspects, the set of CPE starting positions is selected from a plurality of sets of CPE starting positions based at least in part on one or more sets of CPE starting positions indicated in SCI of SL-PRS transmissions associated with one or more other sidelink location service sessions, a priority associated with the sidelink location service session, a time window duration of the sidelink location service session, a delay budget for the SL-PRS, a number of SL-PRS resources configured in a resource pool associated with the SL-PRS, a SL-PRS resource identifier associated with the sidelink location service session, a resource configuration associated with the sidelink location service session, or a combination thereof.

[0214] In a sixteenth aspect, alone or in combination with one or more of the first through fifteenth aspects, the set of CPE starting positions is selected from a plurality of sets of CPE starting positions based at least in part on one or more sets of CPE starting positions indicated in SCI of SL-PRS transmissions associated with one or more other sidelink location service sessions that satisfy a set of criteria.

[0215] In a seventeenth aspect, alone or in combination with one or more of the first through sixteenth aspects, the set of criteria includes whether an RSRP of a PSCCH associated with the SCI satisfies a threshold, whether distance between a location associated with the sidelink location service session and a location associated with another sidelink location service session that is associated with the SCI satisfies a threshold distance, or a combination thereof.

[0216] In an eighteenth aspect, alone or in combination with one or more of the first through seventeenth aspects, the SCI includes location information associated with the other sidelink location service session, and wherein the distance between the location associated with the sidelink location service session and the location associated with the other sidelink location service session is determined based at least in part on the location information.

[0217] In a nineteenth aspect, alone or in combination with one or more of the first through eighteenth aspects, the location information associated with the other sidelink location service session comprises a zone identifier associated with the other sidelink location service session.

[0218] Although Fig. 9 shows example blocks of process 900, in some aspects, process 900 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 9. Additionally, or alternatively, two or more of the blocks of process 900 may be performed in parallel.

[0219] Fig. 10 is a diagram of an example apparatus 1000 for wireless communication, in accordance with the present disclosure. The apparatus 1000 may be a UE, or a UE may include the apparatus 1000. In some aspects, the apparatus 1000 includes a reception component 1002,a transmission component 1004, and / or a communication manager 1006, which may be in communication with one another (for example, via one or more buses and / or one or more other components). In some aspects, the communication manager 1006 is the communication manager 140 described in connection with Fig. 1. As shown, the apparatus 1000 may communicate with another apparatus 1008, such as a UE or a network node (such as a CU, a DU, an RU, or a base station), using the reception component 1002 and the transmission component 1004.

[0220] In some aspects, the apparatus 1000 may be configured to perform one or more operations described herein in connection with Fig. 8. Additionally, or alternatively, the apparatus 1000 may be configured to perform one or more processes described herein, such as process 900 of Fig. 9. In some aspects, the apparatus 1000 and / or one or more components shown in Fig. 10 may include one or more components of the UE described in connection with Fig. 2. Additionally, or alternatively, one or more components shown in Fig. 10 may be implemented within one or more components described in connection with Fig. 2. Additionally, or alternatively, one or more components of the set of components may be implemented at least in part as software stored in one or more memories. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer- readable medium and executable by one or more controllers or one or more processors to perform the functions or operations of the component.

[0221] The reception component 1002 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 1008. The reception component 1002 may provide received communications to one or more other components of the apparatus 1000. In some aspects, the reception component 1002 may perform signal processing on the received communications (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, de-mapping, equalization, interference cancellation, or decoding, among other examples), and may provide the processed signals to the one or more other components of the apparatus 1000. In some aspects, the reception component 1002 may include one or more antennas, one or more modems, one or more demodulators, one or more MIMO detectors, one or more receive processors, one or more controllers / processors, one or more memories, or a combination thereof, of the UE described in connection with Fig. 2.

[0222] The transmission component 1004 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 1008. In some aspects, one or more other components of the apparatus 1000 may generate communications and may provide the generated communications to the transmission component 1004 for transmission to the apparatus 1008. In some aspects, the transmission component 1004 may perform signal processing on the generated communications (such as filtering,amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples), and may transmit the processed signals to the apparatus 1008. In some aspects, the transmission component 1004 may include one or more antennas, one or more modems, one or more modulators, one or more transmit MIMO processors, one or more transmit processors, one or more controllers / processors, one or more memories, or a combination thereof, of the UE described in connection with Fig. 2. In some aspects, the transmission component 1004 may be co-located with the reception component 1002 in one or more transceivers.

[0223] The communication manager 1006 may support operations of the reception component 1002 and / or the transmission component 1004. For example, the communication manager 1006 may receive information associated with configuring reception of communications by the reception component 1002 and / or transmission of communications by the transmission component 1004. Additionally, or alternatively, the communication manager 1006 may generate and / or provide control information to the reception component 1002 and / or the transmission component 1004 to control reception and / or transmission of communications.

[0224] The reception component 1002 may receive a set of CPE starting positions associated with a side link location service session. The transmission component 1004 may transmit, within a first location service session time window, an SL-PRS based at least in part on a CPE starting position selected from the set of CPE starting positions associated with the sidelink location service session.

[0225] The reception component 1002 may receive information indicating the set of CPE starting positions from a network node or another UE.

[0226] The reception component 1002 may receive information indicating that the set of CPE starting positions is activated for the sidelink location service session, wherein the set of CPE starting positions is determined according to a sidelink procedure associated with determining the set of CPE starting positions when the set of CPE starting positions is not activated for the sidelink location service session.

[0227] The reception component 1002 may receive SCI associated with a PSCCH associated with the SL-PRS indicating a CPE starting position associated with another sidelink location service session, the set of CPE starting positions, a session identifier associated with the sidelink location service session, a session identifier associated with the other sidelink location service session, or a combination thereof.

[0228] The number and arrangement of components shown in Fig. 10 are provided as an example. In practice, there may be additional components, fewer components, different components, or differently arranged components than those shown in Fig. 10. Furthermore, two or more components shown in Fig. 10 may be implemented within a single component, or asingle component shown in Fig. 10 may be implemented as multiple, distributed components. Additionally, or alternatively, a set of (one or more) components shown in Fig. 10 may perform one or more functions described as being performed by another set of components shown in Fig. 10.

[0229] The following provides an overview of some Aspects of the present disclosure:

[0230] Aspect 1 : A method of wireless communication performed by a UE, comprising: receiving a set of CPE starting positions specific to a sidelink location service session; and transmitting, within a first location service session time window, an SL-PRS based at least in part on a CPE starting position selected from the set of CPE starting positions specific to the sidelink location service session, wherein the CPE starting position corresponds to a same CPE starting position for all transmissions performed for the sidelink location service session, and wherein the CPE starting position is different from CPE starting positions for one or more other sidelink location service sessions comprising a second location service session time window that at least partially overlaps with the first location service session time window.

[0231] Aspect 2: The method of Aspect 1, wherein the sidelink location service session is associated with a plurality of UEs, wherein the plurality of UEs includes the UE, wherein each UE, of the plurality of UEs selects the CPE starting position from the set of CPE starting positions, and wherein each UE, of the plurality of UEs transmits a respective SL-PRS based at least in part on the CPE starting position.

[0232] Aspect 3: The method of any of Aspects 1-2, wherein the set of CPE starting positions includes a plurality of CPE starting positions.

[0233] Aspect 4: The method of Aspect 3, wherein the CPE starting position is randomly selected from the set of CPE starting positions.

[0234] Aspect 5: The method of any of Aspects 1-4, wherein the set of CPE starting positions comprises a sub-set of CPE starting positions included in a set of out-of-COT values specified in a wireless communication standard.

[0235] Aspect 6: The method of any of Aspects 1-5, wherein the set of CPE starting positions comprises a sub-set of CPE starting positions included in a set of out-of-COT values configured for a sidelink resource pool associated with the sidelink location service session.

[0236] Aspect 7: The method of any of Aspects 1-6, wherein a resource reservation is associated with a slot selected for transmitting the SL-PRS, and wherein the CPE starting position corresponds to a default CPE.

[0237] Aspect 8: The method of any of Aspects 1-7, wherein the CPE starting position is applied to at least an AGC symbol preceding a PSCCH associated with the SL-PRS.

[0238] Aspect 9: The method of Aspect 8, wherein a transmission gap is between an end of the PSCCH and a start of the SL-PRS, the method further comprising: detecting whether there isinterference within the transmission gap between the SL-PRS and the PSCCH; and randomly selecting a CPE starting position for the SL-PRS or using a same CPE as the PSCCH based at least in part on detecting the interference within the gap, wherein an in-COT CPE is selected if the interference is detected within the gap.

[0239] Aspect 10: The method of any of Aspects 1-9, further comprising: receiving information indicating the set of CPE starting positions from a network node or another UE.

[0240] Aspect 11 : The method of Aspect 10, wherein the information indicating the set of CPE starting positions is received during formation of the sidelink location service session, during a discovery phase of the sidelink location service session, after establishment of the sidelink location service session, or a combination thereof.

[0241] Aspect 12: The method of any of Aspects 1-11, wherein the set of CPE starting positions is determined according to a sidelink procedure associated with determining the set of CPE starting positions.

[0242] Aspect 13: The method of any of Aspects 1-12, wherein the set of CPE starting positions is determined based at least in part on a rule, a mapping, or a combination thereof.

[0243] Aspect 14: The method of any of Aspects 1-13, further comprising: receiving information indicating that the set of CPE starting positions is activated for the sidelink location service session, wherein the set of CPE starting positions is determined according to a sidelink procedure associated with determining the set of CPE starting positions when the set of CPE starting positions is not activated for the sidelink location service session.

[0244] Aspect 15: The method of any of Aspects 1-14, further comprising: receiving SCI associated with a PSCCH associated with the SL-PRS indicating a CPE starting position associated with another sidelink location service session, the set of CPE starting positions, a session identifier associated with the sidelink location service session, a session identifier associated with the other sidelink location service session, or a combination thereof.

[0245] Aspect 16: The method of any of Aspects 1-15, wherein the set of CPE starting positions is selected from a plurality of sets of CPE starting positions based at least in part on: one or more sets of CPE starting positions indicated in SCI of SL-PRS transmissions associated with one or more other sidelink location service sessions, a priority associated with the sidelink location service session, a time window duration of the sidelink location service session, a delay budget for the SL-PRS, a number of SL-PRS resources configured in a resource pool associated with the SL-PRS, a SL-PRS resource identifier associated with the sidelink location service session, a resource configuration associated with the sidelink location service session, or a combination thereof.

[0246] Aspect 17: The method of any of Aspects 1-16, wherein the set of CPE starting positions is selected from a plurality of sets of CPE starting positions based at least in part onone or more sets of CPE starting positions indicated in SCI of SL-PRS transmissions associated with one or more other sidelink location service sessions that satisfy a set of criteria.

[0247] Aspect 18: The method of Aspect 17, wherein the set of criteria includes: whether an RSRP of a PSCCH associated with the SCI satisfies a threshold, whether distance between a location associated with the sidelink location service session and a location associated with another sidelink location service session that is associated with the SCI satisfies a threshold distance, or a combination thereof.

[0248] Aspect 19: The method of Aspect 18, wherein the SCI includes location information associated with the other sidelink location service session, and wherein the distance between the location associated with the sidelink location service session and the location associated with the other sidelink location service session is determined based at least in part on the location information.

[0249] Aspect 20: The method of Aspect 19, wherein the location information associated with the other sidelink location service session comprises a zone identifier associated with the other sidelink location service session.

[0250] Aspect 21 : An apparatus for wireless communication at a device, the apparatus comprising one or more processors; one or more memories coupled with the one or more processors; and instructions stored in the one or more memories and executable by the one or more processors to cause the apparatus to perform the method of one or more of Aspects 1-20.

[0251] Aspect 22: An apparatus for wireless communication at a device, the apparatus comprising one or more memories and one or more processors coupled to the one or more memories, the one or more processors configured to cause the device to perform the method of one or more of Aspects 1-20.

[0252] Aspect 23 : An apparatus for wireless communication, the apparatus comprising at least one means for performing the method of one or more of Aspects 1-20.

[0253] Aspect 24: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by one or more processors to perform the method of one or more of Aspects 1-20.

[0254] Aspect 25 : A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform the method of one or more of Aspects 1-20.

[0255] Aspect 26: A device for wireless communication, the device comprising a processing system that includes one or more processors and one or more memories coupled with the one or more processors, the processing system configured to cause the device to perform the method of one or more of Aspects 1-20.

[0256] Aspect 27 : An apparatus for wireless communication at a device, the apparatus comprising one or more memories and one or more processors coupled to the one or more memories, the one or more processors individually or collectively configured to cause the device to perform the method of one or more of Aspects 1-20.

[0257] The foregoing disclosure provides illustration and description but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired from practice of the aspects.

[0258] As used herein, the term “component” is intended to be broadly construed as hardware or a combination of hardware and at least one of software or firmware. “Software” shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, or functions, among other examples, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. As used herein, a “processor” is implemented in hardware or a combination of hardware and software. It will be apparent that systems or methods described herein may be implemented in different forms of hardware or a combination of hardware and software. The actual specialized control hardware or software code used to implement these systems or methods is not limiting of the aspects. Thus, the operation and behavior of the systems or methods are described herein without reference to specific software code, because those skilled in the art will understand that software and hardware can be designed to implement the systems or methods based, at least in part, on the description herein. A component being configured to perform a function means that the component has a capability to perform the function, and does not require the function to be actually performed by the component, unless noted otherwise.

[0259] As used herein, “satisfying a threshold” may, depending on the context, refer to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, or not equal to the threshold, among other examples.

[0260] As used herein, a phrase referring to “at least one of’ a list of items refers to any combination of those items, including single members. As an example, “at least one of: a, b, or c” is intended to cover a, b, c, a + b, a + c, b + c, and a + b + c, as well as any combination with multiples of the same element (for example, a + a, a + a + a, a + a + b, a + a + c, a + b + b, a + c + c, b + b, b + b + b, b + b + c, c + c, and c + c + c, or any other ordering of a, b, and c).

[0261] No element, act, or instruction used herein should be construed as critical or essential unless explicitly described as such. Also, as used herein, the articles “a” and “an” are intended to include one or more items and may be used interchangeably with “one or more.” Further, asused herein, the article “the” is intended to include one or more items referenced in connection with the article “the” and may be used interchangeably with “the one or more.” Furthermore, as used herein, the terms “set” and “group” are intended to include one or more items and may be used interchangeably with “one or more.” Where only one item is intended, the phrase “only one” or similar language is used. Also, as used herein, the terms “has,” “have,” “having,” and similar terms are intended to be open-ended terms that do not limit an element that they modify (for example, an element “having” A may also have B). Further, the phrase “based on” is intended to mean “based on or otherwise in association with” unless explicitly stated otherwise. Also, as used herein, the term “or” is intended to be inclusive when used in a series and may be used interchangeably with “and / or,” unless explicitly stated otherwise (for example, if used in combination with “either” or “only one of’). It should be understood that “one or more” is equivalent to “at least one.”

[0262] Even though particular combinations of features are recited in the claims or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. Many of these features may be combined in ways not specifically recited in the claims or disclosed in the specification. The disclosure of various aspects includes each dependent claim in combination with every other claim in the claim set.

Claims

WHAT IS CLAIMED IS:

1. An apparatus for wireless communication, comprising: one or more memories; and one or more processors, coupled to the one or more memories, configured to cause the apparatus to: receive a set of cyclic prefix extension (CPE) starting positions specific to a sidelink location service session; and transmit, within a first location service session time window, a sidelink positioning reference signal (SL-PRS) based at least in part on a CPE starting position selected from the set of CPE starting positions specific to the sidelink location service session, wherein the CPE starting position corresponds to a same CPE starting position for all transmissions performed for the side link location service session, and wherein the CPE starting position is different from CPE starting positions for one or more other sidelink location service sessions comprising a second location service session time window that at least partially overlaps with the first location service session time window.

2. The apparatus of claim 1, wherein the sidelink location service session is associated with a plurality of UEs, wherein the plurality of UEs includes the apparatus, wherein each UE, of the plurality of UEs, selects the CPE starting position from the set of CPE starting positions, and wherein the each UE, of the plurality of UEs, transmits a respective SL-PRS based at least in part on the CPE starting position.

3. The apparatus of claim 1, wherein the set of CPE starting positions includes a plurality of CPE starting positions.

4. The apparatus of claim 3, wherein the CPE starting position is randomly selected from the set of CPE starting positions.

5. The apparatus of claim 1, wherein the set of CPE starting positions comprises a sub-set of CPE starting positions included in a set of out-of-channel occupancy time (COT) values specified in a wireless communication standard.

6. The apparatus of claim 1, wherein the set of CPE starting positions comprises a sub-set of CPE starting positions included in a set of out-of-channel occupancy time (COT) values configured for a sidelink resource pool associated with the sidelink location service session.

7. The apparatus of claim 1, wherein a resource reservation is associated with a slot selected for transmitting the SL-PRS, and wherein the CPE starting position corresponds to a default CPE.

8. The apparatus of claim 1, wherein the CPE starting position is applied to at least an automatic gain control (AGC) symbol preceding a physical sidelink control channel (PSCCH) associated with the SL-PRS.

9. The apparatus of claim 8, wherein a transmission gap is between an end of the PSCCH and a start of the SL-PRS, wherein the one or more processors are further configured to cause the apparatus to: detect whether there is interference within the transmission gap between the SL-PRS and the PSCCH; and randomly select the CPE starting position for the SL-PRS or using a same CPE as the PSCCH based at least in part on detecting the interference within the transmission gap, wherein an in-channel occupancy time (COT) CPE is selected if the interference is detected within the transmission gap.

10. The apparatus of claim 1, wherein the one or more processors are further configured to cause the apparatus to: receive information indicating the set of CPE starting positions from a network node or another UE.

11. The apparatus of claim 10, wherein the information indicating the set of CPE starting positions is received during formation of the sidelink location service session, during a discovery phase of the sidelink location service session, after establishment of the sidelink location service session, or a combination thereof.

12. The apparatus of claim 1, wherein the set of CPE starting positions is determined according to a sidelink procedure associated with determining the set of CPE starting positions.

13. The apparatus of claim 1, wherein the set of CPE starting positions is determined based at least in part on a rule, a mapping, or a combination thereof.

14. The apparatus of claim 1, wherein the one or more processors are further configured to cause the apparatus to:receive information indicating that the set of CPE starting positions is activated for the sidelink location service session, wherein the set of CPE starting positions is determined according to a sidelink procedure associated with determining the set of CPE starting positions when the set of CPE starting positions is not activated for the sidelink location service session.

15. The apparatus of claim 1, wherein the one or more processors are further configured to cause the apparatus to: receive sidelink control information (SCI) associated with a physical sidelink control channel (PSCCH) associated with the SL-PRS indicating the CPE starting position associated with another sidelink location service session, the set of CPE starting positions, a session identifier associated with the sidelink location service session, a session identifier associated with the other sidelink location service session, or a combination thereof.

16. The apparatus of claim 1, wherein the set of CPE starting positions is selected from a plurality of sets of CPE starting positions based at least in part on: one or more sets of CPE starting positions indicated in sidelink control information (SCI) of SL-PRS transmissions associated with the one or more other sidelink location service sessions, a priority associated with the sidelink location service session, a time window duration of the sidelink location service session, a delay budget for the SL-PRS, a number of SL-PRS resources configured in a resource pool associated with the SL- PRS, a SL-PRS resource identifier associated with the sidelink location service session, a resource configuration associated with the sidelink location service session, or a combination thereof.

17. The apparatus of claim 1, wherein the set of CPE starting positions is selected from a plurality of sets of CPE starting positions based at least in part on one or more sets of CPE starting positions indicated in sidelink control information (SCI) of SL-PRS transmissions associated with the one or more other sidelink location service sessions that satisfy a set of criteria.

18. The apparatus of claim 17, wherein the SCI includes location information associated with the other sidelink location service session, and wherein a distance between a location associated with the sidelink location service session and a location corresponding to the locationinformation associated with the other sidelink location service session is determined based at least in part on the location information.

19. A method of wireless communication performed by a user equipment (UE), comprising: receiving a set of cyclic prefix extension (CPE) starting positions specific to a sidelink location service session; and transmitting, within a first location service session time window, a sidelink positioning reference signal (SL-PRS) based at least in part on a CPE starting position selected from the set of CPE starting positions specific to the sidelink location service session, wherein the CPE starting position corresponds to a same CPE starting position for all transmissions performed for the sidelink location service session, and wherein the CPE starting position is different from CPE starting positions for one or more other sidelink location service sessions comprising a second location service session time window that at least partially overlaps with the first location service session time window.

20. A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising: one or more instructions that, when executed by one or more processors of a user equipment (UE), cause the UE to: receive a set of cyclic prefix extension (CPE) starting positions specific to a sidelink location service session; and transmit, within a first location service session time window, a sidelink positioning reference signal (SL-PRS) based at least in part on a CPE starting position selected from the set of CPE starting positions specific to the sidelink location service session, wherein the CPE starting position corresponds to a same CPE starting position for all transmissions performed for the sidelink location service session, and wherein the CPE starting position is different from CPE starting positions for one or more other sidelink location service sessions comprising a second location service session time window that at least partially overlaps with the first location service session time window.

Images