Resource configuration for sidelink positioning reference signals

Abstract

Aspects of the present disclosure relate to an apparatus, such as a transmitting user equipment (UE) (e.g., a target UE) that receives a sidelink (SL) positioning reference signal (PRS) configuration of a plurality of resource sets from a base station. The transmitting UE also receives SL-PRS resources in at least one of a UE-specific resource unit offset or a frequency offset from the anchor UE. The transmitting UE transmits the determined candidate SL PRS resources for PRS transmission within a resource set of the plurality of resource sets to the anchor UE.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. Provisional Application Serial No. 63 / 411,484, filed on September 29, 2022, entitled “Resource Configuration for Sidelink Positioning Reference Signals,” the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] The present disclosure relates to wireless communications and, more particularly, to sidelink positioning reference signals (PRS). Background Art

[0004] A wireless communication system may include one or more network communication devices, such as a base station, which may also be referred to as an eNodeB (eNB), a next generation NodeB (gNB), or other suitable terms. Each network communication device (such as a base station) may support wireless communication for one or more user communication devices, which may also be referred to as a user equipment (UE) or other suitable terms. A wireless communication system may support wireless communication with one or more user communication devices by utilizing resources of the wireless communication system, such as time resources (e.g., symbols, time slots, subframes, frames, etc.) or frequency resources (e.g., subcarriers, carriers). In addition, a wireless communication system may support wireless communication across various radio access technologies, including third generation (3G) radio access technology, fourth generation (4G) radio access technology, fifth generation (5G) radio access technology, and other suitable radio access technologies other than 5G (e.g., sixth generation (6G)).

[0005] Wireless communication systems include a network-based positioning framework that enables UE-assisted and UE-based positioning methods. However, conventional network-based positioning does not support UE-to-UE relative positioning, ranging, and orientation determination, which would facilitate relative positioning applications across various other services, such as for vehicle-to-everything (V2X), public safety, industrial Internet of Things (IIoT), commercial, and other applications. Summary of the invention

[0006] The present disclosure relates to methods, devices and systems that support sidelink PRS resource configuration. By utilizing the technology, multiple sidelink PRS resource sets can be configured to be limited to the time and frequency resources of the positioning resource pool, and each of the sidelink PRS resource sets includes one or more sidelink (SL)-PRS resources and can be configured with a PRS symbol length and a PRS comb size. The sidelink control information (SCI) may include a time-frequency positioning resource, a resource set identifier (ID), a comb pattern, a resource unit offset and a table index within the resource set, which describes the frequency offset k' as a symbol number within the sidelink PRS resource set (i.e., at each symbol, a different resource unit (RE) offset is used). In addition, a higher layer may provide a PRS resource pool ID, a comb pattern and a PRS symbol length in the time domain to the mode-2 candidate resource allocation process to select SL-PRS candidate resources. The SL PRS candidate resources may report to the higher layer the resource unit offset and / or frequency offset corresponding to the comb pattern.

[0007] Further aspects of the present disclosure relate to comb pattern configurations, wherein multiple comb patterns configured in a resource set or resource pool may be time division multiplexed (TDM) in different time slots to avoid any overlap between them. Alternatively, different non-overlapping resource unit offsets and / or frequency offsets k' may be used in the same time slot to accommodate different comb patterns. With reference to PRS aggregation, a transmitting UE may signal a PRS subband combination to be aggregated by a receiver UE from one or more resource sets and / or one or more resource pools or a combination thereof using sidelink control information to facilitate wideband PRS measurements at the receiver UE. The described aspects of resource configuration for sidelink PRS provide reliable and efficient sidelink wireless communication between UEs.

[0008] In some implementations of the methods and apparatus described herein, a transmitting UE (e.g., a target UE) receives a SL-PRS configuration for a plurality of resource sets from a base station and receives a SL-PRS resource in at least one of a UE-specific resource unit offset or a frequency offset from an anchor UE. The transmitting UE sends the determined candidate SL-PRS resource for PRS transmission within a resource set of the plurality of resource sets to the anchor UE.

[0009] Some implementations of the methods and apparatus described herein may also include: a sidelink PRS configuration received from a base station includes a plurality of resource sets, each resource set including a comb pattern, a PRS length, and a reference point associated with a mapping in a resource pool. The transmitting UE determines a candidate SL-PRS resource for PRS transmission within a resource set based at least in part on the comb pattern and the PRS length. The SL-PRS resource received from the anchor UE includes: a table index of a mapping of at least one UE-specific resource unit offset or a frequency offset for a comb pattern, the table index being based on a symbol number within the SL PRS resource. Each symbol within the SL-PRS resource has a different resource unit offset. The transmitting UE reports the determined candidate SL-PRS resource, the determined candidate SL-PRS resource including a combination of the following items: a resource unit, a frequency offset corresponding to a comb pattern, and a time-frequency resource. The transmitting UE configures PRS hopping using a plurality of PRS subbands configured within one or more resource sets of the plurality of resource sets. The transmitting UE configures a plurality of comb patterns in a resource set, wherein each comb pattern is time-division multiplexed.

[0010] In some implementations of the methods and apparatus described herein, a transmitting UE (e.g., an anchor UE) receives SL-PRS configurations for a plurality of resource sets from a base station, and receives at least one of a UE-specific resource unit offset or a frequency offset for transmission of SL-PRS resources to the target UE from a target UE. The transmitting UE transmits to the target UE the determined candidate SL-PRS resources for PRS transmission within a resource set of the plurality of resource sets.

[0011] Some implementations of the methods and apparatus described herein may also include: a sidelink PRS configuration received from a base station includes a plurality of resource sets, each resource set including a comb pattern, a PRS length, and a reference point associated with a mapping in a resource pool. The transmitting UE determines a candidate SL-PRS resource for PRS transmission within the resource set based at least in part on the comb pattern and the PRS length. The transmitting UE reports the determined candidate SL-PRS resource, the determined candidate SL-PRS resource including a combination of the following items: a resource unit, a frequency offset corresponding to the comb pattern, and a time-frequency resource. The transmitting UE configures PRS hopping using a plurality of PRS subbands configured within one or more resource sets of the plurality of resource sets. The transmitting UE configures a plurality of comb patterns in the resource set, wherein each comb pattern is time-division multiplexed.

[0012] In some implementations of the methods and apparatus described herein, a network entity (NE) (such as a base station) receives a SL-PRS configuration for a plurality of resource sets, and sends the SL-PRS configuration for the plurality of resource sets to one or more UEs. Some implementations of the methods and apparatus described herein may also include a SL-PRS configuration, the SL-PRS configuration including a plurality of resource sets, each resource set including a comb pattern, a PRS length, and a reference point associated with a mapping in a resource pool. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 An example of a wireless communication system supporting resource configuration for sidelink PRS according to aspects of the present disclosure is shown.

[0014] Figure 2 An example of a positioning resource pool with PRS resource sets supporting resource configuration for sidelink PRS according to aspects of the present disclosure is shown.

[0015] Figure 3 An example of a comb-4 partial interleaved mapping showing a PRS length of three (3) is shown to support resource configuration for sidelink PRS in accordance with aspects of the present disclosure.

[0016] Figure 4 An example of a PRS slot structure supporting resource configuration for sidelink PRS according to aspects of the present disclosure is shown.

[0017] Figure 5 An example of a hybrid slot structure supporting resource configuration for sidelink PRS according to aspects of the present disclosure is shown.

[0018] Figure 6 An example of PRS repetition within a slot supporting resource configuration for sidelink PRS according to aspects of the present disclosure is shown.

[0019] Figure 7 and 8 An example of a block diagram of a device supporting sidelink PRS resource configuration according to aspects of the present disclosure is shown.

[0020] Figures 9 to 13 A flow chart supporting a method for sidelink PRS resource configuration according to aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0021] The wireless communication system includes a network-based positioning framework that enables UE-assisted and UE-based positioning methods. However, conventional network-based positioning does not support UE-to-UE relative positioning, ranging, and orientation determination, which would facilitate relative positioning applications across various other services (such as for V2X, public safety, industrial IIoT, commercial, and other applications), such as for in-coverage, partial coverage, and out-of-coverage scenarios. Traditionally, for network-based positioning, the LMF configures the downlink (DL)-PRS to the target or initiator UE through the DL-PFL and DL-PRS resources through the positioning protocol (LPP), which contains the PRS configuration, positioning type (e.g., AoA, round-trip time (RTT), TDOA, etc.), and measurement reports received from the serving and neighboring gNBs. The DL-PRS can be transmitted in beams, and the DL-PRS beam is called a DL-PRS resource, and the entire set of PRS beams transmitted from a TRP on the same frequency is called a DL PRS resource set. The comb pattern and the muting pattern are configured per resource set.

[0022] In terms of resource configuration for sidelink PRS, the present disclosure describes the details of the configuration for SL-PRS resource configuration within a resource pool (e.g., comb patterns, muting patterns, and how they affect mode-1 and mode-e RA processes, and SL-PRS resource aggregation for wideband measurements). At a high level, each SL-PRS resource set can start from any subchannel in the resource pool and can be configured with a PRS bandwidth ranging from the minimum subchannel size to the maximum subchannel size within the resource pool in steps of the subchannel size. Multiple PRS resource sets can be configured within a resource pool, and each resource set in a resource set can be configured with a comb pattern, a muting pattern, etc. In another option, the SL-PRS resource start, end, and multiple comb patterns can be configured within a positioning resource pool. In addition, for the option, mode-1 and mode-2RA can be considered.

[0023] In another aspect of resource configuration for sidelink PRS, and with reference to the PRS resource set configuration in a resource pool, multiple sidelink PRS resource sets can be configured to be restricted to the time and frequency resources of the positioning resource pool, and each sidelink PRS resource set in the sidelink PRS resource set includes one or more SL-PRS resources and can be configured with a PRS symbol length and a PRS comb size. The SCI may include the time-frequency positioning resources, resource set ID, comb pattern, resource-unit offset, and table index within the resource set, which describes the frequency offset k' as the symbol number within the sidelink PRS resource set (i.e., different RE offsets are used on each symbol). In addition, a higher layer may provide the PRS resource pool ID, comb pattern, and PRS symbol length in the time domain to the mode-2 candidate resource allocation process to select the SL-PRS candidate resources. The SL-PRS candidate resources may report the resource unit offset and / or frequency offset corresponding to the comb pattern to the higher layer.

[0024] In further aspects, and with reference to comb pattern configuration, multiple comb patterns configured in a resource set or resource pool may be TDMed in different time slots to avoid any overlap between them. Alternatively, different non-overlapping resource unit offsets and / or frequency offsets k' may be used in the same time slot to accommodate different comb patterns. With reference to PRS aggregation, a transmitting UE may signal a PRS subband combination to be aggregated by a receiver UE from one or more resource sets and / or one or more resource pools or a combination thereof using sidelink control information to facilitate wideband PRS measurements at the receiver UE.

[0025] Aspects of the disclosure are described in the context of a wireless communication system.Aspects of the disclosure are further illustrated and described with reference to device diagrams and flow charts.

[0026] Figure 1An example of a wireless communication system 100 supporting sidelink PRS resource configuration according to aspects of the present disclosure is shown. The wireless communication system 100 may include one or more network entities 102, one or more UEs 104, a core network 106, and a packet data network 108. The wireless communication system 100 may support various radio access technologies. In some implementations, the wireless communication system 100 may be a 4G network, such as an LTE network or an advanced LTE (LTE-A) network. In some other implementations, the wireless communication system 100 may be a 5G network, such as an NR network. In other implementations, the wireless communication system 100 may be a combination of a 4G network and a 5G network, or may be other suitable radio access technologies, including the Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20. The wireless communication system 100 may support radio access technologies other than 5G. In addition, the wireless communication system 100 may support technologies such as time division multiple access (TDMA), frequency division multiple access (FDMA), or code division multiple access (CDMA).

[0027] One or more network entities 102 may be dispersed throughout a geographic area to form a wireless communication system 100. One or more of the network entities 102 described herein may be or include or may be referred to as a network node, a base station, a network element, a radio access network (RAN), a base transceiver station, an access point, a NodeB, an eNodeB (eNB), a next generation NodeB (gNB), or other suitable terms. The network entity 102 and the UE 104 may communicate via a communication link 110, which may be a wireless or wired connection. For example, the network entity 102 and the UE 104 may perform wireless communication (e.g., receive signaling, send signaling) via a Uu interface.

[0028] The network entity 102 may provide a geographic coverage area 112 for which the network entity 102 may support services (e.g., voice, video, packet data, messaging, broadcast, etc.) for one or more UEs 104 within the geographic coverage area 112. For example, the network entity 102 and the UE 104 may support wireless communications of signals associated with services (e.g., voice, video, packet data, messaging, broadcast, etc.) according to one or more radio access technologies. In some implementations, the network entity 102 may be mobile, for example, a satellite associated with a non-terrestrial network. In some implementations, different geographic coverage areas 112 associated with the same or different radio access technologies may overlap, but different geographic coverage areas 112 may be associated with different network entities 102. The information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0029] One or more UEs 104 may be dispersed throughout the geographic area of ​​the wireless communication system 100. UE 104 may include or may be referred to as a mobile device, a wireless device, a remote device, a remote unit, a handheld device or a subscriber device, or some other suitable term. In some implementations, UE 104 may be referred to as a unit, a station, a terminal or a client, etc. Additionally or alternatively, UE 104 may be referred to as an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a Machine Type Communication (MTC) device, etc. In some implementations, UE 104 may be stationary in the wireless communication system 100. In some other implementations, UE 104 may be mobile in the wireless communication system 100.

[0030] One or more UEs 104 may be devices of different forms or with different capabilities. Figure 1 Some examples of UE 104 are shown. UE 104 may be able to communicate with various types of devices, such as network entity 102, other UE 104, or network equipment (e.g., core network 106, packet data network 108, relay device, integrated access and backhaul (IAB) node, or another network device), such as Figure 1 Additionally or alternatively, UE 104 can support communications with other network entities 102 or UE 104, which can act as a relay in wireless communication system 100.

[0031] The UE 104 may also be capable of supporting wireless communications directly with other UEs 104 via a communication link 114. For example, the UE 104 may support wireless communications directly with another UE 104 via a device-to-device (D2D) communication link. In some implementations, such as vehicle-to-vehicle (V2V) deployments, vehicle-to-everything (V2X) deployments, or cellular-V2X deployments, the communication link 114 may be referred to as a side link. For example, the UE 104 may support wireless communications directly with another UE 104 via a PC5 interface.

[0032] The network entity 102 may support communication with the core network 106 or with another network entity 102, or both. For example, the network entity 102 may interface with the core network 106 via one or more backhaul links 116 (e.g., via S1, N2, or another network interface). The network entities 102 may communicate with each other via the backhaul links 116 (e.g., via X2, Xn, or another network interface). In some implementations, the network entities 102 may communicate with each other directly (e.g., between the network entities 102). In some other implementations, the network entities 102 may communicate with each other or indirectly (e.g., via the core network 106). In some implementations, one or more network entities 102 may include subcomponents, such as an access network entity, which may be an example of an access node controller (ANC). The ANC may communicate with one or more UEs 104 via one or more other access network transmission entities, which may be referred to as radio heads, smart radio heads, or transmission-reception points (TRPs).

[0033] In some implementations, the network entity 102 may be configured in a decomposed architecture that may be configured to utilize a protocol stack that is physically or logically distributed between two or more network entities 102, such as an integrated access backhaul (IAB) network, an open RAN (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance), or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN)). For example, the network entity 102 may include one or more of a central unit (CU), a distributed unit (DU), a radio unit (RU), a RAN intelligent controller (RIC) (e.g., a near real-time RIC (Near-RT RIC), a non-real-time RIC (Non-RT RIC)), a service management and orchestration (SMO) system, or any combination thereof.

[0034] The RU may also be referred to as a radio head, a smart radio head, a remote radio head (RRH), a remote radio unit (RRU), or a transmission reception point (TRP). One or more components of the network entity 102 in the decomposed RAN architecture may be co-located, or one or more components of the network entity 102 may be located in a distributed location (e.g., a separate physical location). In some implementations, one or more network entities 102 of the decomposed RAN architecture may be implemented as a virtual unit (e.g., a virtual CU (VCU), a virtual DU (VDU), a virtual RU (VRU)).

[0035] The division of functions between CU, DU and RU can be flexible and can support different functions depending on which functions (e.g., network layer functions, protocol layer functions, baseband functions, radio frequency functions and any combination thereof) are executed at the CU, DU or RU. For example, the functional division of the protocol stack can be adopted between the CU and the DU so that the CU can support one or more layers of the protocol stack and the DU can support one or more different layers of the protocol stack. In some implementations, the CU can carry higher protocol layer (e.g., Layer 3 (L3), Layer 2 (L2)) functions and signaling (e.g., Radio Resource Control (RRC), Service Data Adaptation Protocol (SDAP), Packet Data Convergence Protocol (PDCP)). The CU can be connected to one or more DUs or RUs, and one or more DUs or RUs can carry lower protocol layers, such as Layer 1 (L1) (e.g., physical (PHY) layer) or L2 (e.g., radio link control (RLC) layer, media access control (MAC) layer) functions and signaling, and each can be at least partially controlled by the CU.

[0036] Additionally or alternatively, a functional split of the protocol stack may be employed between the DU and the RU such that the DU may support one or more layers of the protocol stack and the RU may support one or more different layers of the protocol stack. The DU may support one or more different cells (e.g., via one or more RUs). In some implementations, the functional split between the CU and the DU or between the DU and the RU may be within the protocol layer (e.g., certain functions for a protocol layer may be performed by one of the CU, DU, or RU, while other functions of the protocol layer may be performed by a different one of the CU, DU, or RU).

[0037] The CU may be further functionally divided into CU control plane (CU-CP) and CU user plane (CU-UP) functions. The CU may be connected to one or more DUs via a mid-range communication link (e.g., F1, F1-c, F1-u), and the DU may be connected to one or more RUs via a front-haul communication link (e.g., an open front-haul (FH) interface). In some implementations, the mid-range communication link or the front-haul communication link may be implemented based on an interface (e.g., a channel) between layers of a protocol stack supported by each network entity 102 communicating via such a communication link.

[0038] The core network 106 may support user authentication, access authorization, tracking, connectivity, and other access, routing, or mobility functions. The core network 106 may be an evolved packet core (EPC) or a 5G core (5GC), which may include control plane entities that manage access and mobility (e.g., mobility management entity (MME), access and mobility management function (AMF)) and user plane entities that route packets or interconnect with external networks (e.g., serving gateway (S-GW), packet data network (PDN) gateway (P-GW), or user plane function (UPF)). In some implementations, the control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management (e.g., data bearers, signaling bearers, etc.) for one or more UEs 104 served by one or more network entities 102 associated with the core network 106.

[0039] The core network 106 may communicate with the packet data network 108 via one or more backhaul links 116 (e.g., via S1, N2, or another network interface). The packet data network 108 may include an application server 118. In some implementations, one or more UEs 104 may communicate with the application server 118. The UE 104 may establish a session (e.g., a protocol data unit (PDU) session, etc.) with the core network 106 via the network entity 102. The core network 106 may route traffic (e.g., control information, data, etc.) between the UE 104 and the application server 118 using the established session (e.g., the established PDU session). The PDU session may be an example of a logical connection between the UE 104 and the core network 106 (e.g., one or more network functions of the core network 106).

[0040] In the wireless communication system 100, the network entity 102 and the UE 104 may use the resources of the wireless communication system 100 (such as time resources (e.g., symbols, time slots, subframes, frames, etc.) or frequency resources (e.g., subcarriers, carriers)) to perform various operations (e.g., wireless communication). In some implementations, the network entity 102 and the UE 104 may support different resource structures. For example, the network entity 102 and the UE 104 may support different frame structures. In some implementations, such as in 4G, the network entity 102 and the UE 104 may support a single frame structure. In some other implementations, such as in 5G and other suitable radio access technologies, the network entity 102 and the UE 104 may support various frame structures (i.e., multiple frame structures). The network entity 102 and the UE 104 may support various frame structures based on one or more parameter sets.

[0041] One or more parameter sets may be supported in the wireless communication system 100, and the parameter sets may include subcarrier spacing and cyclic prefixes. A first parameter set (e.g., μ=0) may be associated with a first subcarrier spacing (e.g., 15kHz) and a normal cyclic prefix. A first parameter set (e.g., μ=0) associated with a first subcarrier spacing (e.g., 15kHz) may utilize one slot per subframe. A second parameter set (e.g., μ=1) may be associated with a second subcarrier spacing (e.g., 30kHz) and a normal cyclic prefix. A third parameter set (e.g., μ=2) may be associated with a third subcarrier spacing (e.g., 60kHz) and a normal cyclic prefix or an extended cyclic prefix. A fourth parameter set (e.g., μ=3) may be associated with a fourth subcarrier spacing (e.g., 120kHz) and a normal cyclic prefix. A fifth parameter set (e.g., μ=4) may be associated with a fifth subcarrier spacing (e.g., 240kHz) and a normal cyclic prefix.

[0042] The time intervals of resources (e.g., communication resources) can be organized according to frames (also referred to as radio frames). Each frame can have a duration, for example, a duration of 10 milliseconds (ms). In some implementations, each frame can include multiple subframes. For example, each frame can include 10 subframes, and each subframe can have a duration, for example, a duration of 1 ms. In some implementations, each frame can have the same duration. In some implementations, each subframe of a frame can have the same duration.

[0043] Additionally or alternatively, the time intervals of resources (e.g., communication resources) may be organized according to time slots. For example, a subframe may include a certain number (e.g., quantity) of time slots. Each time slot may include a certain number (e.g., quantity) of symbols (e.g., orthogonal frequency division multiplexing (OFDM) symbols). In some implementations, the number (e.g., quantity) of time slots used for a subframe may depend on a parameter set. For a conventional cyclic prefix, a time slot may include 14 symbols. For an extended cyclic prefix (e.g., applicable to a 60kHz subcarrier spacing), a time slot may include 12 symbols. For a conventional cyclic prefix and an extended cyclic prefix, the relationship between the number of symbols per time slot, the number of time slots per subframe, and the number of time slots per frame may depend on a parameter set. It should be understood that references to a first parameter set (e.g., μ=0) associated with a first subcarrier spacing (e.g., 15kHz) may be used interchangeably between subframes and time slots.

[0044] In the wireless communication system 100, the electromagnetic (EM) spectrum can be divided into various categories, frequency bands, channels, etc. based on frequency or wavelength. By way of example, the wireless communication system 100 can support one or more operating frequency bands, such as the frequency range designations FR1 (410 MHz–7.125 GHz), FR2 (24.25 GHz–52.6 GHz), FR3 (7.125 GHz–24.25 GHz), FR4 (52.6 GHz–114.25 GHz), FR4a or FR4-1 (52.6 GHz–71 GHz), and FR5 (114.25 GHz–300 GHz). In some implementations, the network entity 102 and the UE 104 can perform wireless communications on one or more of the operating frequency bands. In some implementations, FR1 can be used by the network entity 102 and the UE 104 and other devices or apparatuses for cellular communication traffic (e.g., control information, data). In some implementations, FR2 may be used by the network entity 102 and UE 104 and other devices or apparatuses for short-range, high data rate capabilities.

[0045] FR1 can be associated with one or more parameter sets (e.g., at least three parameter sets). For example, FR1 can be associated with a first parameter set (e.g., μ=0), the first parameter set including 15kHz subcarrier spacing; a second parameter set (e.g., μ=1), the second parameter set including 30kHz subcarrier spacing; and a third parameter set (e.g., μ=2), the third parameter set including 60kHz subcarrier spacing. FR2 can be associated with one or more parameter sets (e.g., at least 2 parameter sets). For example, FR2 can be associated with a third parameter set (e.g., μ=2), the third configuration parameter includes 60kHz subcarrier spacing; and a fourth parameter set (e.g., μ=3), the fourth parameter set including 120kHz subcarrier spacing.

[0046] Depending on the implementation, one or more of the network entities 102 and the UE 104 may be operable to implement various aspects of resource configuration for sidelink PRS as described herein. For example, the network entity 102 (e.g., a base station) transmits a SL-PRS configuration 120 of a plurality of resource sets to the UE 104. In at least one implementation, the SL-PRS configuration 120 includes a plurality of resource sets, each resource set including a comb pattern, a PRS length, and a reference point associated with a mapping in a resource pool. A transmitting UE (e.g., a target UE) receives the SL-PRS configuration 120 of the plurality of resource sets from the base station (e.g., the network entity 102), and receives a SL-PRS resource 122 in at least one of a UE-specific resource unit offset or a frequency offset from the anchor UE 104. The transmitting UE transmits to the anchor UE a determined candidate SL-PRS resource 124 for PRS transmission within a resource set of the plurality of resource sets. In another implementation, a transmitting UE (e.g., an anchor UE) receives a SL-PRS configuration 120 for a plurality of resource sets from a base station and receives at least one of a UE-specific resource unit offset or a frequency offset for transmission of a SL-PRS resource 122 to the target UE from a target UE 104. The transmitting UE sends the determined candidate SL-PRS resources 124 for PRS transmission within a resource set of the plurality of resource sets to the target UE.

[0047] Referring to the positioning solution, the DL-PRS configuration contains PRS resources, resource sets, frequency layers, repetitions, beam information, etc. There can be up to four frequency layers, and each frequency layer has up to 64 TRPs. Each TRP of each frequency layer can have two DL-PRS resource sets, thus causing a total of eight resource sets per TRP, and each resource set can have up to 64 resources. Each resource corresponds to a beam. Each TRP has two different resource sets per frequency layer, allowing the gNB to configure one wide beam set and another narrow beam set for each frequency layer.

[0048] The PRS coverage on the time-frequency grid is configurable with a starting physical resource block (PRB) and a PRS bandwidth. The PRS can start from any PRB in the system bandwidth and can be configured with a bandwidth ranging from 24 to 276 PRBs in steps of 4 PRBs. This is equivalent to a maximum bandwidth of approximately 100MHz for 30kHz subcarrier spacing and a maximum bandwidth of approximately 400MHz for 120kHz subcarrier spacing. Flexible bandwidth configuration allows the network to configure PRS while keeping out-of-band emissions at an acceptable level. Large bandwidth allows very significant improvements in time of arrival (TOA) accuracy compared to LTE.

[0049] PRS can be sent in beams. PRS beams are called PRS resources, and the entire set of PRS beams sent from a TRP on the same frequency is called a PRS resource set. Different beams can be time-division multiplexed across symbols or time slots. To assist UE receive (RX) beamforming, the DL-PRS can be configured as quasi-co-located (QCL) type D with a DL reference signal from a serving cell or a neighboring cell, and the same RX beam used by the UE to receive the reference signal can be used to receive the configured PRS. The beam structure of PRS improves coverage, especially for mmWave deployments, and also allows AoD estimation (e.g., the UE can measure the DL-PRS received signal time difference (RSTD) for each beam and report the measured RSTD including the DL-PRS resource ID (beam ID) to the LMF.

[0050] To improve positioning accuracy, more measurements can be collected, and the measurements are collected per resource. Therefore, repeated transmission of PRS resources helps to collect more measurements, which can be collected per resource. Repetition of resources can be done in two ways, namely repeat first and then scan and scan first and then repeat. The number and type of repetitions can be configured using parameters for configuring the gap between resources (TPRS gap) and the number of resource repetitions (TPRS rep) within the period (TPRS per) of the resource set. DL PRS resources can be repeated up to 32 times within the resource set period, either as continuous time slots or with configurable gaps between repetitions. The resource set period in FR1 ranges from 4 to 10240 milliseconds.

[0051] DL-PRS is designed to allow the UE to perform accurate TOA measurements in the presence of interfering DL-PRS from nearby TRPs. Each symbol of the DL PRS has a comb structure in frequency (i.e., the PRS utilizes every Nth subcarrier). The comb value N can be configured to be 2, 4, 6, or 12. The length of the PRS within a slot is a multiple of N symbols, and the position of the first symbol within the slot is flexible as long as the slot consists of at least N PRS symbols. It allows continuous subcarriers to be accumulated across slots, thereby improving the correlation properties for TOA estimation. The resource unit pattern can be offset in frequency by a frequency offset of 0 to N-1 subcarriers, allowing N orthogonal DL-PRSs to utilize the same symbol. All configurable patterns cover every subcarrier in the configured bandwidth for the pattern duration, which gives the maximum measurement range for TOA measurements in scenarios with large delay spread. DL-PRS is quadrature phase shift keying (QPSK) modulated by a standardized 31-bit goldcode sequence, which is initialized based on the DL-PRS sequence ID, which takes values ​​from 0 to 4095.

[0052] In addition to the comb structure that allows multiplexing of multiple TRPs in a timeslot, muting of the signal can also be used as a way to mitigate interference. Muting can be used at the repetition level, where each repetition can be muted individually within a periodic opportunity, or at the opportunity level, where the entire periodic DL-PRS opportunity (including all repetitions) can be muted. The positioning technologies supported in Rel-16 are listed in Table 1.

[0053]

[0054]

[0055] Table 1: Supported Rel-16 UE positioning methods

[0056] Separate positioning techniques can be configured and executed based on the requirements of the LMF and UE capabilities. The transmission of the PRS enables the UE to perform measurements related to UE positioning, thereby enabling the calculation of the UE's position estimate, and is configured based on a Transmission Reception Point (TRP), where the TRP can transmit one or more beams.

[0057] In aspects of the present disclosure, 3GPP RAN1 Rel18 protocol is considered. Referring to RAN1#109-e protocol, new reference signals for SL positioning and ranging use existing PRS / sounding reference signal (SRS) design and SL design framework as a starting point. Considerations include at least sequence design, frequency domain mode, time domain mode (e.g., number of symbols, repetition, etc.), and time domain behavior, as well as configuration, triggering, activation and deactivation, automatic gain control (AGC) time, Tx-Rx turnaround time, (multiple) supportable bandwidths, multiplexing options with other SL channels, and randomization and / or orthogonalization options of SL-PRS. Please note that research on existing SL reference signals for SL positioning and ranging is not excluded. Companies are encouraged to perform performance evaluations and comparisons to investigate whether these reference signals can meet positioning accuracy requirements.

[0058] Regarding the frequency-domain pattern, consider including a comb-shaped N SL-PRS design. Consider aspects where N >= 1 (where N = 1 corresponds to the full RE mapping pattern); a fully interleaved SL-PRS pattern (e.g., having M SL-PRS symbols with comb-shaped-N, where M = N, and different RE offsets are used on each symbol); a partially interleaved SL-PRS pattern (e.g., having M SL-PRS symbols with comb-shaped-N, where M < N, and different RE offsets are used on each symbol); a non-interleaved SL-PRS pattern (e.g., having M SL-PRS symbols with comb-shaped-N, where the same RE offset is used on each symbol, N > 1). Is there any relationship between the number of SL PRS symbols within a time slot and the repetition of the comb-shaped N option and RE offset pattern within the time slot, and for further study (FFS), there are also other frequency-domain patterns (s).

[0059] Referring to the RAN1#110-e protocol and terminology, the target UE is the UE to be located (in this context, using SL, i.e., the PC5 interface). Sidelink positioning is using the reference signals sent via SL (i.e., the PC5 interface) to locate the UE to obtain absolute position, relative position, or ranging information. Ranging is determining the distance and / or direction between the UE and another entity (e.g., an anchor UE). The sidelink positioning reference signal (SL PRS) is a reference signal sent via SL for positioning purposes. SL-PRS (pre)-configuration is the configuration or pre-configured parameters of the SL-PRS, such as time-frequency resources (not excluding other parameters), including its bandwidth and period. The anchor UE is the UE that supports the positioning of the target UE (e.g., by sending and / or receiving reference signals for positioning on the SL interface, providing positioning-related information, etc.). FFS is the clarification of the knowledge of the position of the anchor UE.

[0060] Other considerations include RTT type solutions using SL, considering both single-sided (also known as unidirectional) and double-sided (also known as bidirectional) RTT. SL-AoA includes both horizontal angle of arrival (AoA) and vertical angle of arrival (ZoA) in the study. SL-Time Difference of Arrival (TDOA). SL-AoD corresponds to a method in which the reference signal received power (RSRP) and / or RSRPP measurements are similar to the DL-AoD method in Uu, and both horizontal transmission angle (AoD) and vertical transmission angle (ZoD) are included in the study. Reuse the NR SL parameter set (FR1 and FR2, note that this does not mean that SL-PRS specific optimization will be considered). The new SL-PRS design includes sequence design, frequency domain mode, time domain mode (e.g., number of symbols, repetition, etc.) and time domain behavior, as well as the configuration, triggering, activation and / or deactivation, AGC time, Tx-Rx turnaround time, (multiple) supportable bandwidths, multiplexing options with other SL channels, and randomization and / or orthogonalization options of SL-PRS.

[0061] With respect to positioning methods supported using at least SL measurements, potential candidate positioning methods include at least RTT type solutions using SL, SL-AoA and SL-TDOA. Note that other methods may still be studied and the above classification does not necessarily mean that there will be a designated separate SL positioning method.

[0062] New reference signals should be introduced to support SL positioning and ranging. For the sequence of the new reference signal for SL positioning and ranging, select downward between Alt 1 and Alt 2, where Alt.1 is based on pseudo-random. Use the existing DL-PRS sequence as a starting point. Alt.2 is based on the Zadoff-Chu (ZC) sequence (starting with the SRS sequence). Regarding the frequency domain pattern, a comb-N SL-PRS design occupying M symbols should be introduced to support NR SL positioning. Note that there may be multiple values ​​for M and N. Regarding the frequency domain pattern for multi-symbol SL PRS, partially and fully interleaved SL-PRS are prioritized. Note that this does not exclude comb N=1, and if supported, FFS is a single-symbol SL PRS.

[0063] Regarding SL-PRS resource allocation, both Scheme 1 and Scheme 2 should be introduced to support SL positioning and ranging. For Scheme 1, network-centric operation SL PRS resource allocation (e.g., similar to the traditional Mode 1 solution), and the network (e.g., gNB, LMF, gNB&LMF) allocates resources for SL-PRS. For Scheme 2, UE autonomous SL-PRS resource allocation (e.g., similar to the traditional Mode 2 solution), and at least one of the (multiple) UEs participating in the sidelink positioning operation allocates resources for SL-PRS. Regarding sidelink positioning resource allocation, one of the following alternatives should be introduced to support SL positioning and ranging: For Alternative One, only (multiple) dedicated resource pools can be configured or pre-configured for SL-PRS, and for Alternative Two, (multiple) dedicated resource pools and / or (multiple) shared resource pools with sidelink communication can be configured or pre-configured for SL-PRS. Note that whether other signals or channels can be present in the dedicated resource pool can be further discussed.

[0064] Referring to SL positioning resource allocation (2), in scheme 1, SL-PRS resource allocation is network-centric (e.g., similar to the traditional mode 1 solution) and the network (e.g., gNB, LMF, gNB&LMF) allocates resources for SL-PRS. In scheme 2, UE autonomous SL-PRS resource allocation (e.g., similar to the traditional mode 2 solution) is performed, where at least one of the (multiple) UEs participating in the sidelink positioning operation allocates resources for SL-PRS and is applicable regardless of network coverage. For FFS, if necessary, potential mechanisms are used for SL-PRS resource coordination across multiple transmitting UEs (e.g., a solution similar to IUC). Note that other schemes are not excluded from being studied, as well as how FFS handles resource allocation for SL positioning measurement reports.

[0065] With reference to the configuration, activation, deactivation and / or triggering of SL PRS, option one is that only high-layer signaling participates in the SL-PRS configuration, without lower-layer participation (e.g., SL-Media Access Control Unit (MAC-CE) or SCI or Downlink Control Information (DCI), for activation or triggering of SL-PRS), and based on research, this option may correspond to a single or multiple SL-PRS configurations, and / or a higher-layer configuration may be received from the LMF, gNB or UE. Option two is that high-layer and lower-layer signaling participate in the SL-PRS configuration, and the lower layer may correspond to SL-MAC-CE, or SCI, or DCI. For example, higher-layer signaling may be used for SL-PRS configuration, and lower-layer signaling may be used to initiate SL positioning and / or configuration, triggering, activation, deactivation and / or indication, and potential resource indication or reserved transmission of SL-PRS.

[0066] In terms of resource configuration for sidelink PRS, the present disclosure describes the details of the configuration for SL-PRS resource configuration within a resource pool (e.g., comb patterns, muting patterns, and how they affect mode-1 and mode-e radio access (RA) procedures, and SL-PRS resource aggregation for wideband measurements). At a high level, each SL-PRS resource set can start from any subchannel in the resource pool and can be configured with a PRS bandwidth from the minimum subchannel size to the maximum subchannel size of the subchannel size within the resource pool in steps of the subchannel size. Multiple PRS resource sets can be configured within the resource pool, and each resource set in the resource set can be configured with a comb pattern, a muting pattern, etc. In another option, the SLPRS resource start, end, and multiple comb patterns can be configured within the positioning resource pool. In addition, for the option, mode-1 and mode-2RA can be considered.

[0067] In another aspect of resource configuration for sidelink PRS, and with reference to the PRS resource set configuration in a resource pool, multiple sidelink PRS resource sets can be configured to be restricted to the time and frequency resources of the positioning resource pool, and each sidelink PRS resource set in the sidelink PRS resource set includes one or more SL-PRS resources and can be configured with a PRS symbol length and a PRS comb size. The SCI may include the time-frequency positioning resources, resource set ID, comb pattern, resource-unit offset, and table index within the resource set, which describes the frequency offset k' as the symbol number within the sidelink PRS resource set (i.e., different RE offsets are used at each symbol). In addition, a higher layer may provide the PRS resource pool ID, comb pattern, and PRS symbol length in the time domain to the mode-2 candidate resource allocation process to select the SL-PRS candidate resources. The SL-PRS candidate resources may report the resource unit offset and / or frequency offset corresponding to the comb pattern to the higher layer.

[0068] In further aspects, and with reference to comb pattern configuration, multiple comb patterns configured in a resource set or resource pool may be TDMed in different time slots to avoid any overlap between them. Alternatively, different non-overlapping resource unit offsets and / or frequency offsets k' may be used in the same time slot to accommodate different comb patterns. With reference to PRS aggregation, a transmitting UE may signal a PRS subband combination to be aggregated by a receiver UE from one or more resource sets and / or from one or more resource pools or a combination thereof using sidelink control information to facilitate wideband PRS measurements at the receiver UE.

[0069] In the present disclosure, the terms eNB and gNB are used as terms for base stations, but are replaceable by any other radio access nodes (e.g., base station (BS), eNB, gNB, access point (AP), NR, etc.). In addition, aspects of the present disclosure are mainly described in the context of 5G NR. However, aspects of the technology are also applicable to other mobile communication systems supporting serving cells and / or carriers that are configured to communicate via a side link of a PC5 interface.

[0070] Figure 2 An example 200 of a positioning resource pool with PRS resource sets supporting resource configuration for sidelink PRS according to aspects of the present disclosure is shown. Referring to the configuration of PRS resource sets in the resource pool, multiple sidelink PRS resource sets can be configured to be confined within the time and frequency resources of the positioning resource pool, and each PRS resource set has one or more SL-PRS resources. Each PRS resource set in the resource pool can be configured or pre-configured with time and frequency resources, the time and frequency resources including a minimum number of subchannels, a starting subchannel number, an ending subchannel number, a step size for the resource set bandwidth, thereby providing placement of the PRS resource set within the positioning resource pool. The SL-PRS resources can be mapped to time-frequency resource elements (K, L) in PRBs within an allocation provided within the resource set, such as according to:

[0071]

[0072] m=0,1,...

[0073]

[0074]

[0075] When the following conditions are met: the resource element is within a resource block occupied by the SL-PRS resource configured for its UE, and It is the first symbol of the SL-PRS in the resource set that locates the resource pool.

[0076] SL-PRS resources may be confined to the time-frequency resources of a resource set, which in turn may be confined to a positioning resource pool. However, the physical sidelink control channel (PSCCH) occupies 10, 12, or 24 PRBs in a subchannel, and if the PSCCH is transmitted along with the SL-PRS, one subchannel is the minimum that will be allocated for SL-PRS transmission. As shown in example 200, multiple PRS resource sets configured in a positioning resource pool may be time division multiplexed (TDMed) or frequency division multiplexed (FDMed), and / or may overlap completely or partially in time and frequency. Explicitly signaling a resource set ID along with PRS resource activation may be used to identify PRS resources within one of these PRS resource sets.

[0077] Each PRS resource set may be configured with one or more parameters, such as the size of the sidelink PRS resource in the time domain, e.g., -L PRS ∈{2, 4, 6, 12}; comb size A combination of a value of can be configured in a resource set; a muting pattern configuration and a muting repetition factor; and a periodicity, slot offset, time gap, and / or PRS repetition factor. Resource-unit offset It may be signaled to the UE as part of the PRS resource configuration or as part of the activation message, or selected autonomously using a sensing mechanism. The reference point for k=0 is the location of point A of the positioning resource pool where the SL-PRS resources are configured, where point A is given by higher layer parameters. Each resource set is assigned a unique identifier to uniquely identify the resource set in a sidelink carrier or sidelink bandwidth portion or sidelink positioning frequency layer. The gNB or LMF may configure the sidelink UE with one or more resource sets and then activate the positioning resources within the resource set from the positioning resource pool using UE-specific signaling.

[0078] There is also a mapping between positioning QoS, such as for accuracy, latency, and resource sets can be configured and signaled to the UE so that the UE selects a resource set based on the positioning QoS. In an example, each resource set in the resource set can be assigned a priority value or a range of priority values, and these priority values ​​are related to the positioning QoS.

[0079] Figure 3Example 300 showing a partial interleaved mapping of comb-4 with PRS length three (3) supporting resource configuration for sidelink PRS according to aspects of the present disclosure is shown. In an implementation, the SCI may include time-frequency localization resources within a resource set, a resource set ID, a comb pattern, a resource-element offset per UE, and a table index indicating a frequency offset k' as a symbol number within the sidelink PRS resources (i.e., at each symbol, different RE offsets are used to map a particular comb size to different symbols). The combination of values may include values considering a fully interleaved SL PRS pattern (e.g., M SL-PRS symbols with comb-N, where M = N and different RE offsets are used at each symbol), and values considering a partially interleaved SL-PRS pattern (e.g., M SL-PRS symbols with comb-N, where M < N and different RE offsets are used at each symbol).

[0080]

[0081] Table 2: Frequency offset k' as symbol number

[0082] In an example, the quantity k' is given by Table 2 for each comb pattern, providing an RE offset for each symbol number. In Option 1, each PRS resource set within the PRS resource set may be configured with a PRS symbol length and a PRS comb size. In Option 2, each resource set within the PRS resource set may be configured with multiple PRS symbol lengths, where in one example, the PRS symbol length is configured with multiple PRS symbol lengths (i.e., PRS symbol lengths 2, 4, 8, etc., or PRS symbol lengths 4, 8, 12, etc.). The resource set may be configured with one or more comb sizes. However, a dedicated activation message activates the PRS resources from the configuration, and the PRS resources include a symbol length and a comb size.

[0083] In an implementation, the higher layer may provide a PRS resource pool ID, a PRS resource set ID (i.e., assuming the comb pattern is configured per resource set), a PRS symbol length in the time domain, a PRS symbol length, and a PRS bandwidth to a mode-2 candidate resource allocation procedure to select SL-PRS candidate resources. Candidate resources corresponding to the indicated resource pool ID and resource set ID may be reported to the higher layer, which includes the resource-element offset and / or frequency offset of the comb pattern and time-frequency resources.

[0084] In another implementation, the network (gNB or LMF) may configure multiple resource sets to the UE and activate the PRS resources within the resource set using an activation message sent by lower layer signaling, where the resource set contains the PRS length, comb pattern, and a table index describing the frequency offset k' as the symbol number within the sidelink PRS resource (i.e., a different RE offset is used at each symbol).

[0085] In an alternative implementation, the comb pattern may be configured as part of a positioning resource pool (without resource set configuration in the resource pool). One or more of the comb patterns may be configured as part of a positioning resource pool, which may then be further configured with one or more parameters, such as the size of the sidelink PRS resource in the time domain, e.g. -L PRS ∈{2, 4, 6, 12}; comb size A combination of a value of may be configured in a resource set; a muting pattern configuration and a muting repetition factor; and one or more of a periodicity, a slot offset, a time gap, and a PRS repetition factor.

[0086] Resource-Unit Offset It may be signaled to the UE as part of the PRS resource configuration, as part of the activation message, or configured as part of a resource pool, or autonomously selected using a sensing mechanism. In an implementation, the gNB or LMF may configure the sidelink UE with multiple PRS resources, the multiple PRS resources comprising a comb pattern, a PRS length, a resource unit offset and / or a frequency offset, a PRS bandwidth, and may activate one of these PRS resources, the PRS resources comprising a comb pattern, a PRS length, a resource unit offset and / or a frequency offset, or a table index, the table index describing the frequency offset k' as the symbol number within the sidelink PRS resource (i.e., a different RE offset is used at each symbol). In another implementation, a higher layer may provide the PRS resource pool ID, the comb pattern, and the PRS symbol length in the time domain to the Mode-2 candidate resource allocation process to select the SL-PRS candidate resource. The SL-PRS candidate resource may report the resource unit offset and / or frequency offset corresponding to the comb pattern to the higher layer.

[0087] With reference to the PRS slot structure, multiple comb patterns configured in a resource set or resource pool may be TDMed in different slots to avoid any overlap between them. Otherwise, different non-overlapping resource unit offsets and / or frequency offsets k' (i.e., different RE offsets at each symbol) as symbol numbers within the sidelink PRS resource may be used in the same slot to accommodate different comb size patterns.

[0088] Figure 4An example 400 of a PRS slot structure supporting sidelink PRS resource configuration according to aspects of the present disclosure is shown. The PRS slot structure can be configured in a dedicated PRS resource pool, or there are dedicated PRS slots within a shared resource pool. In the case of a shared resource pool, a time domain bitmap within the resource pool indicates the PRS slots. As shown in example 400, the first symbol is an AGC symbol that spans the PRS bandwidth so that the receiver UE can tune to receive a wider PRS bandwidth. If a PSCCH is present, the PRBs for the PSCCH can be configured or pre-configured in a resource pool of PRBs within an occupied subchannel. The PRS can be FDMed with the PSCCH in the remaining PRBs, otherwise the remaining PRBs of the PSCCH symbols within the subchannel are left empty or filled with the second SCI content sent in the PSCCH or PSSCH region.

[0089] Figure 5 An example 500 of a hybrid slot structure supporting resource configuration for sidelink PRS according to aspects of the present disclosure is shown. Similar to the physical sidelink feedback channel (PSFCH) configuration, the PRS can be configured to occupy 2, 4 OFDM symbols towards the end of the slot. In this case, the slot can contain a PSCCH, followed by a physical sidelink shared channel (PSSCH), which is followed by a gap symbol, then an AGC symbol, followed by a PRS symbol, as shown in example 500. The PRS period can be configured in a resource pool. A bitmap of PRBs or subchannels in the shared resource pool indicates the PRS frequency domain resources.

[0090] Figure 6 An example 600 of PRS repetition within a slot supporting resource configuration for sidelink PRS according to aspects of the present disclosure is shown. Sidelink Rel16 does not support the concept of mini-slots for SL data transmission. However, DL PRS supports lengths starting from 2 OFDM symbols, which is similar to mini-slots. In Rel16, for SL data, PSCCH resources are present at the beginning of each slot, as shown in example 600. In this case, different PRS symbol lengths are supported, and shorter PRS symbol lengths can be repeated until the end of the slot. The SCI may contain the number of repetitions within the slot and the PRS symbol length. In option 1, the repetition does not span slots, so it is completed at the slot boundary or in the resource pool slot boundary. In option 2, the repetition spans slots, but the PSCCH is present at the beginning of the slot and the remaining repetition is indicated in the second slot. In option 3 for multi-slot scheduling, one PSCCH schedules multiple PRS (including repetitions) spanning multiple slots.

[0091] With reference to PRS aggregation, multiple PRS subbands may be configured within one or more resource sets, or within a resource pool, a sidelink bandwidth part (BWP), or a sidelink frequency layer, depending on the hierarchical SL-PRS resource relationship. In addition, SL-PRS frequency hopping for a UE may be configured using multiple SL PRS subbands from one or more resource sets and / or from one or more resource pools, or a combination thereof. PRS subbands across one or more resource sets belonging to one or more resource pools may be configured.

[0092] A transmitter UE (e.g., a transmitting UE or an anchor UE) may signal a PRS subband combination to be aggregated by a receiver UE from one or more resource sets and / or from one or more resource pools (or a combination thereof) using sidelink control information to facilitate wideband PRS measurements at the receiver UE. In an example, each subband may be provided with an index, and a bitmap of the indexes may be signaled in the SCI as part of coherent combining. A set of hopping patterns may be configured as part of a resource pool, and the index of the hopping pattern may be signaled in the SCI to the receiver UE.

[0093] Figure 7 An example of a block diagram 700 of a device 702 supporting resource configuration for a sidelink PRS according to aspects of the present disclosure is shown. The device 702 may be an example of a UE 104, such as a transmitting UE (e.g., a target UE or an anchor UE) as described herein. The device 702 may support wireless communications with one or more network entities 102, UEs 104, or any combination thereof. The device 702 may include components for bidirectional communication including components for sending and receiving communications, such as a processor 704, a memory 706, a transceiver 708, and an I / O controller 710. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., a bus).

[0094] The processor 704, the memory 706, the transceiver 708, or various combinations thereof, or various components thereof may be examples of means for performing various aspects of the present disclosure described herein. For example, the processor 704, the memory 706, the transceiver 708, or various combinations or components thereof may support methods for performing one or more operations described herein.

[0095] In some implementations, the processor 704, memory 706, transceiver 708, or various combinations or components thereof may be implemented in hardware (e.g., in a communications management circuit system). The hardware may include a processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, configured to or otherwise support components for performing the functions described in the present disclosure. In some implementations, the processor 704 and the memory 706 coupled to the processor 704 may be configured to perform one or more functions described herein (e.g., execution of instructions stored in the memory 706 by the processor 704).

[0096] For example, the processor 704 may support wireless communication at the device 702 according to examples as disclosed herein. The processor 704 may be configured to or otherwise support components for: receiving a first signaling from a base station as a SL-PRS configuration for a plurality of resource sets; receiving a second signaling from an anchor UE as a SL PRS resource in at least one of a UE-specific resource unit offset or a frequency offset; and sending a third signaling to the anchor UE as a determined candidate SL-PRS resource for PRS transmission within a resource set of the plurality of resource sets.

[0097] In addition, the processor 704 may be configured to or otherwise support any one or combination of sidelink PRS configurations received from a base station, the sidelink PRS configuration comprising a plurality of resource sets, each resource set comprising a comb pattern, a PRS length, and a reference point associated with a mapping in a resource pool. The method also includes determining a candidate SL-PRS resource for PRS transmission within a resource set based at least in part on the comb pattern and the PRS length. The SL-PRS resource received from the anchor UE includes: a table index of a mapping of at least one UE-specific resource unit offset or a frequency offset for a comb pattern, the table index being based on a symbol number within the SL-PRS resource. Each symbol within the SL-PRS resource has a different resource unit offset. The method also includes: reporting a determined candidate SL-PRS resource, the determined candidate SL-PRS resource comprising a combination of the following items: a resource unit, a frequency offset corresponding to a comb pattern, and a time-frequency resource. The method also includes: configuring PRS hopping using a plurality of PRS subbands configured within one or more resource sets in a plurality of resource sets. The method also includes: configuring a plurality of comb patterns in a resource set, wherein each comb pattern is time-division multiplexed.

[0098] Additionally or alternatively, according to an example as disclosed herein, device 702 may include a processor and a memory coupled to the processor, the processor being configured to cause the device to: receive first signaling from a base station as an SL-PRS configuration for multiple resource sets; receive second signaling from an anchor UE as an SL-PRS resource in at least one of a UE-specific resource unit offset or a frequency offset; and send third signaling to the anchor UE as a determined candidate SL-PRS resource for PRS transmission within a resource set of the multiple resource sets.

[0099] In addition, the wireless communication at the device 702 may include any one or a combination of sidelink PRS configurations received from a base station, the sidelink PRS configuration including multiple resource sets, each resource set including a comb pattern, a PRS length, and a reference point associated with a mapping in a resource pool. The processor is configured to cause the device to determine a candidate SL-PRS resource for PRS transmission within the resource set based at least in part on the comb pattern and the PRS length. The SL-PRS resource received from the anchor UE includes: a table index of a mapping of at least one UE-specific resource unit offset or a frequency offset for the comb pattern, the table index being based on a symbol number within the SL-PRS resource. Each symbol within the SL PRS resource has a different resource unit offset. The processor is configured to cause the device to report a determined candidate SL-PRS resource, the determined candidate SL-PRS resource including a combination of the following items: a resource unit, a frequency offset corresponding to a comb pattern, and a time-frequency resource. The processor is configured to cause the device to configure PRS hopping using multiple PRS subbands configured within one or more resource sets of the multiple resource sets. The processor is configured to cause the apparatus to configure a plurality of comb patterns in the resource set, wherein each comb pattern is time division multiplexed.

[0100] In another example, the processor 704 may support wireless communication at the device 702 according to the examples disclosed herein. The processor 704 may be configured to or otherwise support components for: receiving a first signaling from a base station as a SL-PRS configuration for a plurality of resource sets; receiving a second signaling from a target UE as at least one of a UE-specific resource unit offset or a frequency offset for transmission of an SL-PRS resource to the target UE; and sending a third signaling to the target UE as a determined candidate SL-PRS resource for PRS transmission within a resource set of the plurality of resource sets.

[0101] In addition, the processor 704 may be configured to or otherwise support any one or combination of sidelink PRS configurations received from a base station, the sidelink PRS configuration comprising a plurality of resource sets, each resource set comprising a comb pattern, a PRS length, and a reference point associated with a mapping in a resource pool. The method also includes: determining a candidate SL-PRS resource for PRS transmission within a resource set based at least in part on the comb pattern and the PRS length. The method also includes reporting a determined candidate SL-PRS resource, the determined candidate SL-PRS resource comprising a combination of: a resource unit, the frequency offset corresponding to the comb pattern, and a time-frequency resource. The method also includes: configuring PRS hopping using a plurality of PRS subbands configured in one or more resource sets in a plurality of resource sets. The method also includes: configuring a plurality of comb patterns in a resource set, wherein each comb pattern is time-division multiplexed.

[0102] In addition, or alternatively, according to an example as disclosed herein, device 702 may include a processor and a memory coupled to the processor, the processor being configured to cause the device to: receive a first signaling from a base station as a SL-PRS configuration for multiple resource sets; receive a second signaling from a target UE as at least one of a UE-specific resource unit offset or a frequency offset for transmission of an SL-PRS resource to the target UE; and send a third signaling to the target UE as a determined candidate SL-PRS resource for PRS transmission within a resource set of the multiple resource sets.

[0103] In addition, the wireless communication at the device 702 may include: any one or a combination of sidelink PRS configurations received from a base station, the sidelink PRS configuration including multiple resource sets, each resource set including a comb pattern, a PRS length, and a reference point associated with a mapping in a resource pool. The processor is configured to cause the device to determine a candidate SL-PRS resource for PRS transmission within a resource set based at least in part on the comb pattern and the PRS length. The processor is configured to cause the device to report a determined candidate SL-PRS resource, the determined candidate SL-PRS resource including a combination of the following items: a resource unit, the frequency offset corresponding to the comb pattern, and a time-frequency resource. The processor is configured to cause the device to configure PRS hopping using multiple PRS subbands configured in one or more resource sets in the multiple resource sets. The method also includes: configuring multiple comb patterns in the resource set, wherein each comb pattern is time-division multiplexed.

[0104] A processor 704 of a device 702 (such as UE 104) may support wireless communication according to examples as disclosed herein. The processor 704 includes at least one controller coupled to at least one memory and is configured or operable to cause the processor to receive first signaling as a SL-PRS configuration for a plurality of resource sets; receive second signaling from an anchor UE as a SL-PRS resource in at least one of a UE-specific resource unit offset or a frequency offset; and send third signaling to the anchor UE as a determined candidate SL-PRS resource for PRS transmission within a resource set of the plurality of resource sets. Additionally or alternatively, the sidelink PRS configuration includes a plurality of resource sets, each resource set including a comb pattern, a PRS length, and a reference point associated with a mapping in a resource pool. The at least one controller is configured to cause the processor to determine a candidate SL-PRS resource for PRS transmission within a resource set based at least in part on the comb pattern and the PRS length. The SL-PRS resource received from the anchor UE includes: a table index of a mapping of at least one UE-specific resource unit offset or a frequency offset for the comb pattern, the table index being based on a symbol number within the SL-PRS resource.

[0105] The processor 704 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some implementations, the processor 704 may be configured to operate a memory array using a memory controller. In some other implementations, the memory controller may be integrated into the processor 704. The processor 704 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 706) to cause the device 702 to perform various functions of the present disclosure.

[0106] The memory 706 may include random access memory (RAM) and read-only memory (ROM). The memory 706 may store computer-readable, computer-executable code, which includes instructions that, when executed by the processor 704, cause the device 702 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium, such as a system memory or another type of memory. In some implementations, the code may not be directly executable by the processor 704, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein. In some implementations, the memory 706 may include a basic I / O system (BIOS), etc., which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0107] I / O controller 710 can manage input and output signals for device 702. I / O controller 710 can also manage peripheral devices that are not integrated into device 2402. In some implementations, I / O controller 710 can represent a physical connection or port to an external peripheral device. In some implementations, I / O controller 710 can utilize an operating system, such as MS- MS- OS / or another known operating system. In some implementations, I / O controller 710 may be implemented as part of a processor, such as processor 704. In some implementations, a user may interact with device 702 via I / O controller 710 or via hardware components controlled by I / O controller 710.

[0108] In some implementations, the device 702 may include a single antenna 712. However, in some other implementations, the device 702 may have more than one antenna 712 (i.e., multiple antennas), including multiple antenna panels or antenna arrays, which may be able to send or receive multiple wireless transmissions concurrently. The transceiver 708 may communicate bidirectionally via one or more antennas 712, wired or wireless links as described herein. For example, the transceiver 708 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 708 may also include a modem for modulating packets, providing the modulated packets to one or more antennas 712 for transmission, and demodulating packets received from one or more antennas 712.

[0109] Figure 8 An example of a block diagram 800 of a device 802 supporting resource configuration for a sidelink PRS according to aspects of the present disclosure is shown. The device 802 may be an example of a network entity 102 (such as a base station) as described herein. The device 802 may support wireless communications with one or more network entities 102, UEs 104, or any combination thereof. The device 802 may include components for bidirectional communication including components for sending and receiving communications, such as a processor 804, a memory 806, a transceiver 808, and an I / O controller 810. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., a bus).

[0110] The processor 804, the memory 806, the transceiver 808, or various combinations thereof, or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein. For example, the processor 804, the memory 806, the transceiver 808, or various combinations or components thereof may support methods for performing one or more operations described herein.

[0111] In some implementations, the processor 804, memory 806, transceiver 808, or various combinations or components thereof may be implemented in hardware (e.g., in a communications management circuit system). The hardware may include a processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, configured to or otherwise support components for performing the functions described in the present disclosure. In some implementations, the processor 804 and the memory 806 coupled to the processor 804 may be configured to perform one or more functions described herein (e.g., execution of instructions stored in the memory 806 by the processor 804).

[0112] For example, the processor 804 may support wireless communication at the device 802 according to examples as disclosed herein. The processor 804 may be configured to or otherwise support components for: receiving first signaling as a SL-PRS configuration for multiple resource sets; and sending second signaling as a SL-PRS configuration for multiple resource sets to one or more UEs.

[0113] Additionally, processor 804 may be configured to or otherwise support any one or combination of SL-PRS configurations including a plurality of resource sets, each resource set including a comb pattern, a PRS length, and a reference point associated with a mapping in a resource pool.

[0114] Additionally or alternatively, according to an example as disclosed herein, device 802 may include a processor and a memory coupled to the processor, the processor being configured to cause the device to: receive first signaling as a SL-PRS configuration for multiple resource sets; and send second signaling as a SL-PRS configuration for multiple resource sets to one or more UEs.

[0115] Additionally, wireless communication at device 802 may include any one or a combination of SL-PRS configurations including a plurality of resource sets, each resource set including a comb pattern, a PRS length, and a reference point associated with a mapping in a resource pool.

[0116] The processor 804 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some implementations, the processor 804 may be configured to operate a memory array using a memory controller. In some other implementations, the memory controller may be integrated into the processor 804. The processor 804 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 806) to cause the device 802 to perform various functions of the present disclosure.

[0117] The memory 806 may include random access memory (RAM) and read-only memory (ROM). The memory 806 may store computer-readable, computer-executable code, including instructions, which, when executed by the processor 804, cause the device 802 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium, such as a system memory or another type of memory. In some implementations, the code may not be directly executable by the processor 804, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein. In some implementations, the memory 806 may include a basic I / O system (BIOS), etc., which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0118] I / O controller 810 can manage input and output signals for device 802. I / O controller 810 can also manage peripheral devices that are not integrated into device 2402. In some implementations, I / O controller 810 can represent a physical connection or port to an external peripheral device. In some implementations, I / O controller 810 can utilize an operating system, such as MS- MS- OS / or another known operating system. In some implementations, the I / O controller 810 may be implemented as part of a processor, such as the processor 804. In some implementations, a user may interact with the device 802 via the I / O controller 810 or via a hardware component controlled by the I / O controller 810.

[0119] In some implementations, the device 802 may include a single antenna 812. However, in some other implementations, the device 802 may have more than one antenna 812 (i.e., multiple antennas), including multiple antenna panels or antenna arrays, which may be able to concurrently send or receive multiple wireless transmissions. The transceiver 808 may communicate bidirectionally via one or more antennas 812, wired or wireless links as described herein. For example, the transceiver 808 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 808 may also include a modem to modulate packets, provide the modulated packets to one or more antennas 812 for transmission, and demodulate packets received from one or more antennas 812.

[0120] Fig. 9 1 is a flow chart of a method 900 for supporting resource configuration for a sidelink PRS according to aspects of the present disclosure. The operations of the method 900 may be implemented by a device or component thereof as described herein. For example, the operations of the method 900 may be performed by a UE 104, such as described in reference to Figures 1 to 8 The sending UE (eg, target UE) described. In some implementations, the device may execute a set of instructions to control functional elements of the device to perform the described functions. Additionally or alternatively, the device may use dedicated hardware to perform aspects of the described functions.

[0121] At 902, the method may include: receiving first signaling from a base station as a SL-PRS configuration for a plurality of resource sets. The operations of 902 may be performed according to examples as described herein. In some implementations, aspects of the operations of 902 may be performed as described in reference to Figure 1 The device described performs the following.

[0122] At 904, the method may include receiving second signaling from the anchor UE as a SL-PRS resource in at least one of a UE-specific resource unit offset or a frequency offset. The operations of 904 may be performed according to examples as described herein. In some implementations, aspects of the operations of 904 may be performed as described in reference to Figure 1 The device described performs the following.

[0123] At 906, the method may include: sending a third signaling to the anchor UE as a determined candidate SL-PRS resource for PRS transmission within a resource set of the plurality of resource sets. The operations of 906 may be performed according to examples as described herein. In some implementations, aspects of the operations of 906 may be performed as described in reference to Figure 1 The device described performs the following.

[0124] Fig.101 is a flow chart of a method 1000 for supporting sidelink PRS resource configuration according to aspects of the present disclosure. The operations of the method 1000 may be implemented by a device or component thereof as described herein. For example, the operations of the method 1000 may be performed by a UE 104, such as described in reference to Figures 1 to 8 The sending UE (eg, target UE) described herein. In some implementations, the device may execute a set of instructions to control the functional elements of the device to perform the described functions. Additionally or alternatively, the device may use dedicated hardware to perform aspects of the described functions.

[0125] At 1002, the method may include determining a candidate SL-PRS resource for PRS transmission within a resource set based at least in part on a comb pattern and a PRS length. The operations of 1002 may be performed according to examples as described herein. In some implementations, aspects of the operations of 1002 may be performed as described in reference to Figure 1 The device described performs the following.

[0126] At 1004, the method may include reporting a determined candidate SL-PRS resource, the determined candidate SL-PRS resource comprising a combination of a resource unit, a frequency offset corresponding to a comb pattern, and a time-frequency resource. The operation of 1004 may be performed according to examples as described herein. In some implementations, aspects of the operation of 1004 may be performed as described in reference to Figure 1 The device described performs the following.

[0127] At 1006, the method may include configuring PRS hopping using a plurality of PRS subbands configured within one or more resource sets of the plurality of resource sets. The operations of 1006 may be performed according to examples as described herein. In some implementations, aspects of the operations of 1006 may be performed as described in reference to Figure 1 The device described performs the following.

[0128] At 1008, the method may include: configuring a plurality of comb patterns in a resource set, wherein each comb pattern is time division multiplexed. The operations of 1008 may be performed according to examples as described herein. In some implementations, aspects of the operations of 1008 may be performed as described in reference to Figure 1 The device described performs the following.

[0129] Fig.11 1 is a flow chart of a method 1100 for supporting sidelink PRS resource configuration according to aspects of the present disclosure. The operations of the method 1100 may be implemented by a device or component thereof as described herein. For example, the operations of the method 1100 may be performed by a UE 104, such as described in reference to Figures 1 to 8The sending UE (eg, anchor UE) described herein. In some implementations, the device may execute a set of instructions to control the functional elements of the device to perform the described functions. Additionally or alternatively, the device may use dedicated hardware to perform aspects of the described functions.

[0130] At 1102, the method may include: receiving first signaling from a base station as a SL PRS configuration of a plurality of resource sets. The operations of 1102 may be performed according to examples as described herein. In some implementations, aspects of the operations of 1102 may be performed as described in reference to Figure 1 The device described performs the following.

[0131] At 1104, the method may include receiving second signaling from the target UE as at least one of a UE-specific resource unit offset or a frequency offset for transmission of SL PRS resources to the target UE. The operations of 1104 may be performed according to examples as described herein. In some implementations, aspects of the operations of 1104 may be performed as described in reference to Figure 1 The device described performs the following.

[0132] At 1106, the method may include: sending a third signaling to the target UE as a determined candidate SL-PRS resource for PRS transmission within a resource set of the plurality of resource sets. The operations of 1106 may be performed according to examples as described herein. In some implementations, aspects of the operations of 1106 may be performed as described in reference to Figure 1 The device described performs the following.

[0133] Fig.12 1 is a flow chart of a method 1200 for supporting sidelink PRS resource configuration according to aspects of the present disclosure. The operations of the method 1200 may be implemented by a device or component thereof as described herein. For example, the operations of the method 1200 may be performed by a UE 104, such as described in reference to Figures 1 to 8 The sending UE (eg, anchor UE) described herein. In some implementations, the device may execute a set of instructions to control the functional elements of the device to perform the described functions. Additionally, or alternatively, the device may use dedicated hardware to perform aspects of the described functions.

[0134] At 1202, the method may include determining a candidate SL-PRS resource for PRS transmission within a resource set based at least in part on a comb pattern and a PRS length. The operations of 1202 may be performed according to examples as described herein. In some implementations, aspects of the operations of 1202 may be performed as described in reference to Figure 1 The device described performs the following.

[0135] At 1204, the method may include reporting the determined candidate SL-PRS resource, the determined candidate SL-PRS resource comprising a combination of: a resource unit, a frequency offset corresponding to a comb pattern, and a time-frequency resource. The operation of 1204 may be performed according to the examples described herein. In some implementations, aspects of the operation of 1204 may be performed as described in reference to Figure 1 The device described performs the following.

[0136] At 1206, the method may include configuring PRS hopping using a plurality of PRS subbands configured within one or more of the plurality of resource sets. The operations of 1206 may be performed according to examples as described herein. In some implementations, aspects of the operations of 1206 may be performed as described in reference to Figure 1 The device described performs the following.

[0137] At 1208, the method may include configuring a plurality of comb patterns in a resource set, wherein each comb pattern is time division multiplexed. The operations of 1208 may be performed according to examples as described herein. In some implementations, aspects of the operations of 1208 may be performed as described in reference to Figure 1 The device described performs the following.

[0138] Fig.13 1300 for supporting sidelink PRS resource configuration according to aspects of the present disclosure. The operations of the method 1300 may be implemented by an apparatus or component thereof as described herein. For example, the operations of the method 1300 may be performed by a network entity 102, such as described in reference to Figures 1 to 8 The base station, gNB, LMF and / or gNB&LMF described. In some implementations, the device may execute a set of instructions to control the functional elements of the device to perform the described functions. Additionally or alternatively, the device may use dedicated hardware to perform aspects of the described functions.

[0139] At 1302, the method may include receiving first signaling as a SL-PRS configuration for a plurality of resource sets. The operations of 1302 may be performed according to examples as described herein. In some implementations, aspects of the operations of 1302 may be performed as described in reference to Figure 1 The device described performs the following.

[0140] At 1304, the method may include: sending second signaling to one or more UEs as SL-PRS configurations for multiple resource sets. The operations of 1304 may be performed according to examples as described herein. In some implementations, aspects of the operations of 1304 may be performed as described in reference to Figure 1 The device described performs the following.

[0141] It should be noted that the methods described herein describe possible implementations, and that the operations and steps may be rearranged or otherwise modified, and other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0142] The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed using a general purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0143] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or sent via a computer-readable medium as one or more instructions or codes. Other examples and implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hard wiring, or any combination of these. Features that implement the functions may also be physically located in various locations, including being distributed so that parts of the functions are implemented at different physical locations.

[0144] Computer-readable media include both non-transient computer storage media and communication media, including any medium that facilitates the transfer of a computer program from one place to another. Non-transient storage media can be any available medium that can be accessed by a general or special-purpose computer. As an example and not limitation, non-transient computer-readable media can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage, disk storage or other magnetic storage devices, or can be used to carry or store required program code components in the form of instructions or data structures and can be accessed by a general or special-purpose computer or a general or special-purpose processor. Any other non-transient medium.

[0145] Any connection may be appropriately referred to as a computer-readable medium. For example, if the software is sent from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technology (such as infrared, radio, and microwave), the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technology (such as infrared, radio, and microwave) are all included in the definition of computer-readable media. As used herein, disks and optical disks include CDs, laser optical disks, optical disks, digital versatile disks (DVDs), floppy disks, and Blu-ray disks, where disks typically copy data magnetically, while optical disks use lasers to copy data optically. The above combinations are also included in the scope of computer-readable media.

[0146] As used herein, including in the claims, "or" as used in a list of items (e.g., a list of items beginning with a phrase such as "at least one" or "one or more" or "one or two") indicates an inclusive list, so that, for example, a list of at least one of A, B, or C represents A or B or C, or AB or AC or BC or ABC (i.e., A and B and C). Similarly, a list of one or more of A, B, or C represents A or B or C or AB or AC or BC or ABC (i.e., A and B and C). In addition, as used herein, the phrase "based on" should not be interpreted as a reference to a closed set of conditions. For example, an example step described as "based on condition A" can be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on". In addition, as used herein, including in the claims, a "set" may include one or more elements.

[0147] When referring to network entities, the terms "sending," "receiving," or "communicating" may refer to any part of a network entity of a RAN (e.g., base station, CU, DU, RU) communicating with another device (e.g., directly or via one or more other network entities).

[0148] The descriptions set forth herein in conjunction with the accompanying drawings describe example configurations and do not represent all examples that may be implemented or within the scope of the claims. The term "example" as used herein means "used as an example, instance, or illustration," rather than "preferred" or "superior to other examples." The detailed description includes specific details for the purpose of providing an understanding of the described technology. However, these technologies may be practiced without these specific details. In some cases, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0149] The description herein is provided to enable one of ordinary skill in the art to make or use the present disclosure. Various modifications of the present disclosure will be apparent to one of ordinary skill in the art, and the general principles defined herein can be applied to other variations without departing from the scope of the present disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but should be given the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A user equipment (UE) for wireless communication, comprising: at least one memory; as well as at least one processor, coupled to the at least one memory and configured to cause the UE to: receiving first signaling from a base station as a sidelink (SL) positioning reference signal (PRS) configuration for a plurality of resource sets; receiving second signaling from an anchor UE as a SL-PRS resource in at least one of a UE-specific resource unit offset or a frequency offset; as well as A third signaling is sent to the anchor UE as a determined candidate SL-PRS resource for PRS transmission within a resource set of the plurality of resource sets.

2. The UE of claim 1, wherein the sidelink PRS configuration received from the base station comprises the plurality of resource sets, each resource set comprising a comb pattern, a PRS length, and a reference point associated with a mapping in a resource pool.

3. The UE of claim 2, wherein the at least one processor is configured to cause the UE to determine the candidate SL-PRS resources within the resource set for the PRS transmission based at least in part on the comb pattern and the PRS length.

4. The UE according to claim 1, wherein the SL-PRS resource received from the anchor UE comprises: A table index for mapping the at least one UE-specific resource unit offset or the frequency offset for a comb pattern, the table index being based on the symbol number within the SL-PRS resource.

5. The UE of claim 4, wherein each symbol within the SL-PRS resource has a different resource unit offset.

6. The UE according to claim 1, wherein the at least one processor is configured to cause the UE to report the determined candidate SL-PRS resources, and the determined candidate SL-PRS resources include a combination of the following items: a resource unit, the frequency offset corresponding to the comb pattern, and a time-frequency resource. 7 . The UE of claim 1 , wherein the at least one processor is configured to cause the UE to configure PRS hopping using a plurality of PRS subbands configured in one or more resource sets of the plurality of resource sets.

8. The UE of claim 1, wherein the at least one processor is configured to cause the UE to configure a plurality of comb patterns in the resource set, wherein each comb pattern is time division multiplexed.

9. A user equipment (UE) for wireless communication, comprising: at least one memory; as well as at least one processor, coupled to the at least one memory and configured to cause the UE to: receiving first signaling from a base station as a sidelink (SL) positioning reference signal (PRS) configuration for a plurality of resource sets; receiving second signaling from a target UE as at least one of a UE-specific resource unit offset or a frequency offset for transmission of SL-PRS resources to the target UE; as well as A third signaling is sent to the target UE as a determined candidate SL-PRS resource for PRS transmission within a resource set of the multiple resource sets.

10. The UE of claim 9, wherein the sidelink PRS configuration received from the base station comprises the plurality of resource sets, each resource set comprising a comb pattern, a PRS length, and a reference point associated with a mapping in a resource pool.

11. The UE of claim 10, wherein the at least one processor is configured to cause the UE to determine the candidate SL-PRS resources within the resource set for the PRS transmission based at least in part on the comb pattern and the PRS length.

12. The UE according to claim 9, wherein the at least one processor is configured to cause the UE to report the determined candidate SL-PRS resources, the determined candidate SL-PRS resources comprising a combination of: a resource unit, the frequency offset corresponding to a comb pattern, and a time-frequency resource.

13. The UE of claim 9, wherein the at least one processor is configured to cause the UE to configure PRS hopping using a plurality of PRS subbands configured in one or more resource sets of the plurality of resource sets.

14. The UE of claim 9, wherein the at least one processor is configured to cause the UE to configure a plurality of comb patterns in the resource set, wherein each comb pattern is time division multiplexed.

15. A network entity (NE) for wireless communication, comprising: at least one memory; as well as at least one processor coupled to the at least one memory and configured to cause the NE to: receiving first signaling as a sidelink (SL) positioning reference signal (PRS) configuration for a plurality of resource sets; as well as A second signaling is sent to one or more user equipments (UEs) as the SL-PRS configuration of the multiple resource sets.

16. The NE of claim 15, wherein the SL-PRS configuration comprises the plurality of resource sets, each resource set comprising a comb pattern, a PRS length, and a reference point associated with a mapping in a resource pool.

17. A processor for wireless communication, comprising: at least one controller coupled to the at least one memory and configured to cause the processor to: receiving first signaling as a sidelink (SL) positioning reference signal (PRS) configuration for a plurality of resource sets; receiving second signaling from an anchor user equipment (UE) as a SL-PRS resource in at least one of a UE-specific resource unit offset or a frequency offset; as well as A third signaling is sent to the anchor UE as a determined candidate SL-PRS resource for PRS transmission within a resource set of the plurality of resource sets.

18. The processor of claim 17, wherein the sidelink PRS configuration comprises the plurality of resource sets, each resource set comprising a comb pattern, a PRS length, and a reference point associated with a mapping in a resource pool.

19. The processor of claim 18, wherein the at least one controller is configured to cause the processor to determine the candidate SL-PRS resources within the resource set for the PRS transmission based at least in part on the comb pattern and the PRS length.

20. The processor of claim 17, wherein the SL-PRS resources received from the anchor UE comprise: A table index for mapping the at least one UE-specific resource unit offset or the frequency offset for a comb pattern, the table index being based on the symbol number within the SL-PRS resource.

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