WO2024165473A1

WO2024165473A1 - Methods to coordinate sidelink positioning reference signal transmission by user equipments

Info

Publication number: WO2024165473A1
Application number: PCT/EP2024/052726
Authority: WO
Inventors: Reuben GEORGE STEPHEN; David GONZALEZ GONZALEZ; Rikin SHAH; Andreas Andrae; Hojin Kim; Osvaldo Gonsa
Original assignee: Continental Automotive Technologies GmbH
Priority date: 2023-02-06
Filing date: 2024-02-05
Publication date: 2024-08-15

Abstract

Methods to Coordinate Sidelink Positioning Reference Signal Transmission by user equipments comprising the steps indication of SL PRS resource parameters, selection of comb size and RE offset, request for muting SL PRS transmissions, SL PRS muting and indication.

Description

202300039 - 1 - Methods to Coordinate Sidelink Positioning Reference Signal Transmission by user equipments TECHNICAL FIELD The present disclosure relates to Coordinate Sidelink Positioning Reference Signal Transmission by user equipments. BACKGROUND Wireless access systems have been widely deployed to provide various types of communication services such as voice or data. In general, a wireless access system is a multiple access system that supports communication of multiple users by sharing available system resources (a bandwidth, transmission power, etc.) among them. For example, multiple access systems include a Code Division Multiple Access (CDMA) system, a Frequency Division Multiple Access (FDMA) system, a Time Division Multiple Access (TDMA) system, an Orthogonal Frequency Division Multiple Access (OFDMA) system, a Single Carrier Frequency Division Multiple Access (SC-FDMA) system and multi carrier frequency division multiple access (MC-FDMA) system, etc. Sidelink (SL) refers to a communication scheme in which a direct link is established between user equipments (UEs) and the UEs directly exchange voice or data without intervention of a base station (BS). SL is considered as a solution of relieving the BS of the constraint of rapidly growing data traffic. Vehicle-to-everything (V2X) is a communication technology in which a vehicle exchanges information with another vehicle, a pedestrian, and infrastructure by wired/wireless communication. V2X may be categorized into four types: vehicle-to- vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-network (V2N), and vehicle- to-pedestrian (V2P). V2X communication may be provided via a PC5 interface and/or a Uu interface. As more and more communication devices demand larger communication capacities, there is a need for enhanced mobile broadband communication relative to existing 202300039 - 2 - RATs (Radio Access Technologies). Accordingly, a communication system is under discussion, for which services or UEs sensitive to reliability and latency are considered. The next-generation RAT in which eMBB (enhanced Mobile Broadband) communication, mMTC (massive Machine Type Communication), and URLLC (Ultra- Reliable and Low Latency Communication) are considered is referred to as new RAT or NR. In NR, V2X communication may also be supported. 3GPP just concluded SI on “Expanded and Improved NR Positioning” SL positioning most important part of this SI and will be most important part of subsequent WI. For potential solutions to SL positioning, following was agreed to be included in conclusion section of TR 38.859 in RAN1#111. A new sidelink reference signal should be use a Comb frequency domain structure and a pseudorandom-sed sequence where the existing sequence of DL-PRS should be used as a starting point. SCI can be used for reserving/indicating one or more SL-PRS resources. With regards to the power for SL-PRS at least Open Loop PC is recommended for normative. When configuring SL PRS resource for SL positioning, each transmitting UE may choose its own comb size and RE offset parameters. If two or more UEs in proximity with each other choose same comb size and RE offset on same dedicated or shared RP, will lead to degradation in positioning performance. Simply avoiding SL-PRS resources occupied by other UEs is wasteful and can introduce unnecessary delaysThere is a need of a mechanism for UEs to coordinate their SL PRS resource parameter values. US 2017257242 A1 discloses method and an apparatus for transmitting a positioning reference signal (PRS) in a wireless communication system. A terminal obtains positioning subframe configuration information to determine at least one positioning subframe among a plurality of downlink subframes in a wireless frame, obtains downlink subframe configuration information to determine the type of each downlink subframe in the wireless frame, receives PRSs in at least one positioning subframe from a plurality of cells, and reports measured time differences between the PRSs received from the plurality of the cells. The type of each downlink subframe of the wireless frame is classified into a 1st type subframe and a 2nd type subframe, and 202300039 - 3 - the type of at least one positioning subframe is either the 1st type subframe or the 2nd type subframe. In addition, the PRSs are mapped into at least one positioning subframe on the basis of a single PRS pattern. US 2016072616 A1 discloses method of wireless communication includes generating a unique position reference signal (PRS) for a remote radio head having a same physical cell identity (PCI) as a macro eNodeB. The unique PRS is based on a virtual cell ID and/or unique cell global identification (CGI) of the remote radio head such that the unique PRS is different from a PRS of the macro eNodeB. The PRS of the macro eNodeB is based on the PCI. The method also includes transmitting the unique PRS. US 2012093101 A1 a method and system for transmitting a position reference signal, which includes: acquiring a currently needed Position Reference Signal (PRS) sequence with a length of 2×NRBPRS, wherein NRBPRS is the PRS bandwidth configured by high layer signaling, which is represented by a unit of a resource block; determining the position of the PRS sequence in a physical resource block; and transmitting the acquired PRS sequence on the determined position. With the method of the present disclosure, a currently needed PRS sequence is acquired directly, or at first, a PRS sequence with the maximum length is generated, and then the currently needed PRS sequence is intercepted from the PRS sequence with the maximum length. The present disclosure ensures that an effective PRS sequence can be acquired in any circumstance, thereby ensuring the realization of the positioning function of the PRS. US 2010260154 A1 discloses that, a base station communicates a positioning reference signal (PRS) to wireless communication devices over a downlink in a wireless communication system by encoding a PRS into a first set of transmission resources, encoding other information into a second set of transmission resources, multiplexing the two sets of resources into a subframe such that the first set of resources is multiplexed into at least a portion of a first set of orthogonal frequency division multiplexed (OFDM) symbols based on an identifier associated with the base station and the second set of resources is multiplexed into a second set of OFDM symbols. Upon receiving the subframe, a wireless communication device determines 202300039 - 4 - which set of transmission resources contains the PRS based on the identifier associated with the base station that transmitted the subframe and processes the set of resources containing the PRS to estimate timing (e.g., time of arrival) information. US 2011158200 A1 describes a systems and methods to supply positioning reference signal (PRS) in a telecommunication system. A base station supplies a PRS sequence according at least to a time-frequency pattern of modulation symbols, wherein the time-frequency pattern assigns a modulation symbol to each frequency tone in a block of time-frequency resources allocated to transmit PRS. The base station associates a modulation symbol in the time-frequency pattern with a reference symbol in the PRS sequence through a mapping that represents the time-frequency pattern. The PRS sequence is conveyed to user equipment through delivery of a set of modulation symbols established through the mapping. Different time-frequency patterns can be exploited based on time-structure of a radio sub-frame. The user equipment receives the PRS sequence according to at least the time-frequency pattern of modulation symbols and utilizes at least the PRS sequence as part of a process to produce a location estimate. US 2021144735 A1 discloses techniques for wireless communication. A user equipment (UE) engaged in a positioning session with a plurality of transmission- reception points (TRPs) receives a downlink positioning reference signal (DL-PRS) configuration specifying one or more DL-PRS resource sets of a DL-PRS instance, wherein all DL-PRS resources of the one or more DL-PRS resource sets of the DL- PRS instance are scheduled within a time window, and receives an uplink PRS (UL- PRS) configuration specifying one or more UL-PRS resource sets, wherein all of the one or more UL-PRS resources are scheduled within the time window. The UE may perform, during the time window, measurements of DL-PRS transmissions on one or more DL-PRS resources of the one or more DL-PRS resource sets, and transmit, during the time window, at least one UL-PRS on the one or more UL-PRS resources. US 2021051645 A1 techniques for wireless communication. A user equipment (UE) receives, from a transmission point, a first positioning reference signal (PRS) muting pattern for a first subgroup of PRS resources of a first PRS resource set, wherein the first PRS muting pattern comprises a plurality of N bits representing a plurality of N 202300039 - 5 - PRS occasions of the first subgroup of PRS resources, wherein each bit of the plurality of N bits represents a corresponding PRS occasion of the plurality of N PRS occasions of each PRS resource of the first subgroup of PRS resources, and wherein the plurality of N PRS occasions comprises a plurality of active PRS occasions of the first subgroup of PRS resources, and measures, during at least one of the plurality of active PRS occasions of the first subgroup of PRS resources, PRS received from the transmission point. US 2021076359 A1 discloses a method and apparatus of a device that performs a new radio (NR) downlink (DL) positioning reference signal (PRS) resource scheduling is described. In an exemplary embodiment, the device configures at least one of a NR DL PRS Resource Pool, a NR DL PRS Resource Set, a NR DL PRS Resource, and a muting pattern. In addition, the configured NR DL PRS Resource Set may be assigned to a separate Transmission Reception Point (TRP). Furthermore, a list of configured NR DL PRS Resource Sets can be assigned to a separate TRP. The assigned NR DL PRS Resource Set may include PRS Resources with different spatial filters. In addition, the assigned NR DL PRS Resource Set can include PRS Resources with the same spatial filter. US 2022182200 A1 a method of a mobile terminal for transmitting uplink positioning reference signals (UL PRS) to a serving base station and one or more neighbouring base stations in a 5G New Radio mobile communications system. The method comprising: receiving UL PRS configuration information from the serving base station, and transmitting the UL PRS to the serving base station and the one or more neighbouring base stations in accordance with the UL PRS configuration information, wherein the UL PRS configuration information includes an indication of one or more of: a timing advance for the transmission of the UL PRS, a transmission pattern of the UL PRS, a time domain placement of the UL PRS in available UL PRS resources, a quasi-colocation assumption for transmission of the UL PRS, and UL PRS beamforming alignment information US 2021120519 A1 discloses method and a device for configuring a positioning reference signal and a method and a device for receiving the positioning reference signal are provided. The method for configuring the positioning reference signal 202300039 - 6 - includes: transmitting configuration information based on a spatial quasi co-location QCL relationship between a positioning reference signal PRS and a specific downlink signal, where the configuration information is used to determine a resource occupied by the PRS and the specific downlink signal. WO 2021162784 A1 discloses a user equipment (UE). The user equipment (UE) receives configurations for multiple downlink (DL) positioning reference signals (PRS), multiple uplink (UL) PRS, or a combination thereof. A single Medium Access Control - Control Element (MAC-CE) block from a serving base station is provided that activates or deactivates in the UE the transmissions of the multiple UL PRS; reception of the multiple DL PRS, or a combination thereof, and in response the UE activates or deactivates the transmission and/or reception of the multiple UL PRS and/or DL PRS. The MAC-CE block, for example, may identify multiple UL PRS resource sets, each of which includes at least one PRS resource, for activation or deactivation. The MAC-CE block may additionally or alternatively, identify multiple DL PRS resources, multiple DL PRS resource sets, or multiple DL PRS frequency layers for activation or deactivation. US 2022191830 A1 describes devices and methods providing for transmitting downlink (DL) positioning reference signals (PRSs) in a wireless system. A DL PRS resource pool is configured and divided into a plurality of DL PRS resource sets. The DL PRS resource pool includes a periodically repeated amount of resources dedicated for DL PRS transmission by a plurality of gNBs in the wireless communication system. The plurality of DL PRS resource sets correspond to one or more gNB of the plurality of the gNBs. The DL PRSs are encoded for transmission on configured DL PRS resources within the plurality of DL PRS resource sets. US 2021297215 A1 discloses a method and device for transmitting a positioning reference signal. The method includes a base station determining a time-frequency resource for sending a PRS according to configuration information of the PRS, mapping a PRS sequence to the time-frequency resource for sending the PRS, and sending the mapped PRS on the time-frequency resource for sending the PRS, wherein the configuration information of the PRS comprises PRS frequency domain resource information; the PRS frequency domain resource information comprises 202300039 - 7 - PRS resource element (RE) frequency shift information, and the PRS RE frequency shift information is correlated with a PRS OFDM symbol index value calculated from a PRS occasion. US 2021307002 A1 discloses techniques for wireless communication. In an aspect, a user equipment (UE) receives, from a serving cell, an uplink positioning reference signal (UL-PRS) resource configuration, the UL-PRS resource configuration comprising a plurality of N resource elements (REs) staggered in frequency across a plurality of M consecutive symbols of a resource block (RB) such that the plurality of N REs spans a plurality of N consecutive subcarriers of the RB, receives, from the serving cell, an indication of a PRS symbol cancelation group to be used for uplink cancelation, the PRS symbol cancelation group identifying a set of the plurality of M consecutive symbols that is expected to be canceled for uplink transmission, and cancels transmission of UL-PRS on one or more of the set of L symbols identified by the PRS symbol cancelation group. US 2021091905 A1 discloses a method for configuring a positioning reference signal in an NR system, a method for receiving a positioning reference signal in an NR system, and a device. The configuration method includes: transmitting first target configuration information, where the first target configuration information is used to configure a positioning reference signal PRS of a terminal device. EP 4060923 A1 is a disclosure that relates to a pre-configured positioning reference signal (PRS) transmission method for sidelink positioning, and an apparatus therefor. A method for performing, by means of a positioning terminal, on-demand positioning in a new radio-vehicle to everything (NR-V2X) communication system, according to one aspect, comprises the steps of: transmitting a request PRS through a sidelink channel; receiving a response PRS corresponding to the request PRS from a neighboring terminal through the sidelink channel; receiving a measurement result corresponding to the request PRS from the neighboring terminal; and performing positioning on the basis of the response PRS and the measurement result, wherein the positioning terminal transmits, to the neighboring terminal, resource allocation information for transmission of the response PRS corresponding to the request PRS, 202300039 - 8 - and the measurement result may be received through a resource for V2X data transmission. WO 2022028032 A1 discloses a downlink positioning reference signal receiving and transmitting method, and a terminal, a base station, a device and an apparatus, which are used for reducing positioning delays and downlink positioning reference signal overheads, and improving system spectrum efficiency. The method comprises: after receiving SPS DL-PRS configuration information of a plurality of base stations configured by an LMF by means of SPS, a UE receiving SPS DL-PRS activation information of the plurality of base stations; according to a period and time-frequency resource information, which are determined by means of the SPSDL-PRS configuration information, of an SPS DL-PRS, and according to a downlink time slot, which is determined by means of the SPS DL-PRS activation information, of the SPS DL-PRS, the UE receiving and measuring the SPS DL-PRS so as to acquire a positioning measurement value; and the UE sending the positioning measurement value to the LMF or to a service base station of the UE, so as to give the base station corresponding to the SPS DL-PRS activation information a notification regarding stopping sending the SPS DL-PRS. US 2020022167 A1 discloses a network entity schedules, as part of a positioning procedure for a UE, a first set of resources for transmission of DL RS(s) by at least one BS to the UE. The network entity associates the DL RS(s) with UL RS(s) for transmission by the UE on a second set of resources to one or more BSs as part of the positioning procedure for the UE. The network entity transmits, to the UE, an indication of the association between the DL RS(s) and the UL RS(s). The UE receives the indication along with the DL RS(s) from the at least one BS. The UE transmits the UL RS(s) to the one or more BSs on the second set of resources in response to the received indication. US 2022201774 A1 disluses a user equipment (UE). A first user equipment includes: an interface configured to send and receive signals wirelessly; and a processor configured to: establish a sidelink connection with a second user equipment; exchange, using the sidelink connection, sidelink information with the second user equipment to at least one of: transmit, via the interface to the second user equipment, 202300039 - 9 - first SL PRS-related data (sidelink positioning reference signal related data) including at least one of first SL PRS assistance data or first SL PRS configuration data; or receive, via the interface from the second user equipment, second SL PRS-related data including at least one of second SL PRS assistance data or second SL PRS configuration data; and exchange, via the interface with the second user equipment using the sidelink connection, one or more sidelink positioning reference signals in accordance with at least one of the first SL PRS-related data or the second SL PRS- related data. US 2012093122 A1 discloses a method and system for transmitting a position reference signal. Wherein the method includes: frequency domain positions for transmitting a position reference signal are n physical resource blocks, and the value of n is obtained according to signaling; time domain positions for transmitting the position reference signal are the remaining orthogonal frequency division multiplexing symbols in a subframe, except for orthogonal frequency division multiplexing symbols for transmitting a physical downlink control channel and orthogonal frequency division multiplexing symbols for transmitting a cell-specific reference signal; and the position reference signal is transmitted according to the frequency domain position and the time domain position. By adopting the method and the system of the present disclosure, the transmitting of the position reference signal is realized, and the positioning precision of a UE is ensured. WO 2022062891 A1 discloses a resource indication method and apparatus for a PRS under sidelink communication, and a storage medium and a terminal. The method for indicating a PRS resource under sidelink communication comprises: receiving resource indication information sent by a sending UE, wherein the resource indication information is used for indicating the position of a PRS resource and/or a PSSCH resource; and acquiring a target position of the PRS resource according to the resource indication information and preset information, so as to receive a PRS at the target position, wherein the preset information at least comprises a relationship between the PSSCH resource and the PRS resource. Therefore, a resource indication method for a PRS under a sidelink can be provided so as to support positioning research on sidelink communication. 202300039 - 10 - EP 4013171 A1 discloses a method for user equipment in a wireless communication system, a physical sidelink control channel (PSCCH) is received from a plurality of anchor nodes (ANs) on a plurality of subchannels, wherein each of the plurality of subchannels comprises at least one resource block, and, on the basis of the PSCCH, a plurality of positioning reference signals (PRSs) are received from the plurality of ANs, a subchannel identification (ID) is allocated to each of the plurality of subchannels, and the PRS pattern of each of the plurality of PRSs is mapped to the subchannel ID. EP 3925135 A1 discloses a method of wireless communication by a user equipment (UE) includes receiving, by the UE on a component carrier (CC), a downlink (DL) control information (DCI) that triggers transmission, by the UE on another CC, of an uplink (UL) reference signal (RS) for positioning. The method additionally includes transmitting, by the UE in response to the DCI, the UL RS for positioning on the other CC. In other aspects, a method of wireless communication by a base station includes transmitting, by the base station to a UE on a CC, a DCI that triggers transmission, by the UE on another CC, of an UL RS for positioning. The method additionally includes receiving, by the base station from the UE in response to the DCI, the UL RS for positioning on the other CC. US 2021176738 A1 discloses a data transmission method and an apparatus. The method includes: receiving, by a terminal, a first message sent by a network device, where the first message carries first configuration information, the first configuration information indicates a resource location configured for a positioning reference signal PRS on a downlink resource, and a resource on the downlink resource other than the resource occupied by the PRS is used to carry to-be-demodulated data; and demodulating, by the terminal, the to-be-demodulated data based on the first configuration information, where when demodulating data carried on the downlink resource, the terminal skips the resource occupied by the PRS. US 2021167924 A1 discloses techniques related to wireless communication. In an aspect, a sequence generating entity factorizes a comb size N into prime factors of N, and generates one or more offset sequences for a reference signal for positioning 202300039 - 11 - based on one or more sequence lists associated with the prime factors of N and a number of symbols M over which the reference signal is scheduled. EP 4057719 A1 discloses a positioning method using a sidelink, and a device. According to one aspect, a method of performing positioning through a sidelink by a vehicle terminal can comprise the steps of: receiving a request positioning reference signal (PRS) from a positioning terminal; determining the positioning terminal-based direction angle on the basis of the request PRS; determining a response PRS ID corresponding to the request PRS ID of a request RRS, on the basis of the determined direction angle; and transmitting a response PRS corresponding to the determined response PRS ID. The vehicle terminal is capable of communicating with at least one of another vehicle terminal, a UE related to an autonomous driving vehicle, the BS or a network. US 2020225309 A1 discloses techniques for muting positioning reference signals. In aspects, a location server sends, to a user equipment (UE), a plurality of positioning reference signal configurations and one or more positioning reference signal muting configurations associated with a transmission-reception point (TRP) identifier (ID) and/or a positioning reference signal ID. A first TRP sends, to the UE, a command triggering at least one positioning reference signal muting configuration, wherein the triggered positioning reference signal muting configuration indicates that: the one or more positioning reference signals of the one or more positioning reference signal occasions of at least one positioning reference signal configuration are not being transmitted, or the one or more positioning reference signals of the one or more positioning reference signal occasions of all of the plurality of positioning reference signal configurations are not being transmitted, and mutes positioning reference signals according to the triggered positioning reference signal muting configurations. WO 2022050701 A1 discloses a method for estimating a position by a terminal in a wireless communication system. The method for estimating the position by the terminal may comprise the steps of: receiving DL PRS configuration information from a base station, wherein the received DL PRS configuration information comprises information on a comb size and a DL PRS allocation pattern; receiving a DL PRS 202300039 - 12 - from the base station on the basis of the comb size and the DL PRS allocation pattern; and estimating the position on the basis of the received DL PRS. US 2020259683 A1 discloses techniques for using sounding reference signal (SRS) for positioning. In an aspect, a UE receives an SRS configuration, the SRS configuration defining one or more SRS resource sets, each SRS resource set comprising one or more SRS resources, and each SRS resource comprising one or more SRS ports, wherein at least one SRS port of at least one SRS resource of at least one SRS resource set defined in the SRS configuration is usable by the UE at least for positioning. The UE transmits a positioning SRS utilizing one or more positioning SRS ports, wherein the positioning SRS is transmitted in a positioning SRS pattern such that across N consecutive symbols, where N is greater than or equal to two, SRS resource elements (REs) to which the one or more positioning SRS ports are mapped are staggered in frequency and use each of the N consecutive symbols. CN 112702154 A discloses an apparatus of a next generation NodeB (gNB). The apparatus comprises: one or more processors configured to determine a downlink (DL) positioning reference signal (PRS) configuration, the DL PRS configuration comprising a defined DL PRS resource set configuration and a DL PRS resource muting mechanism, wherein the defined DL PRS resource set configuration maintains an extension mechanism using a selected one of DL PRS resource set repetition or occasion dependent time and frequency offset for the DL PRS resource set; and to generate a PRS based on the DL PRS configuration. WO 2022180597 A2 discloses apparatuses, methods, and systems for sidelink ranging for positioning reference signal types. One apparatus includes a transceiver that receives a positioning reference signal ("PRS") configuration for at least one PRS type for transmitting a PRS to at least one second network device, receives a resource pool configuration for transmitting the PRS associated with relative positioning measurements, and receives a multiplexing configuration for multiplexing a physical sidelink control channel ("PSCCH") with the PRS. The apparatus includes a processor that multiplexes the PSCCH with the PRS according to the multiplexing configuration. The transceiver transmits the multiplexed PSCCH and PRS to the at 202300039 - 13 - least one second device according to the PRS configuration and the resource pool configuration. US 2022039052 A1 discloses aspects relate to group-based positioning reference signal (PRS) broadcast in a wireless communication network. Wireless communication devices communicating over a sidelink channel in the wireless communication network may be grouped into one or more positioning groups. Within each positioning group, a respective order of the wireless communication devices in the positioning group may be identified. The wireless communication devices in a positioning group may then communicate PRSs therebetween over the sidelink channel based on the order of wireless communication devices in the positioning group. WO 2022237560 A1 disloses a method for selecting a PRS resource and a communication apparatus. According to its PRS measurement capability, a terminal device determines, from all PRS resources contained in PRS configuration information sent by an LMF, a plurality of PRS resources that can be measured within a capability range of the terminal device, then determines the priorities of the plurality of PRS resources according to the priority order of four levels of configuration of the PRS configuration information: a frequency layer configuration, a TRP configuration, a resource set configuration, and resources, and finally sequentially measures the plurality of PRS resources according to the priorities of the plurality of PRS resources. In the method, the measurement behavior of a terminal device is standardized, and selective measurement of a PRS resource contained in PRS configuration information by the terminal device can be implemented, especially when an LMF is configured beyond the capability of the terminal device, the measurement object is clearer; meanwhile, the LMF is no longer required to allocate specific PRS configuration information for each terminal device, thereby reducing the workload of the LMF. US 2022078747 A1 discloses that a muting configuration for downlink positioning reference signals (PRS) is based on the slot type in which the PRS is transmitted. A slot type muting configuration mutes PRS if the PRS are transmitted in a full duplex slot, such as an in-band full duplex slot. If the PRS are transmitted in a sub-band full 202300039 - 14 - duplex slot, the PRS may be muted depending on whether the base station is capable of self-interference cancellation. The slot type muting configuration does not mute the PRS transmission in a half-duplex slot. The slot type muting configuration may be dynamic and may be provided to a user equipment (UE) in lower layer signaling to improve latency. The slot type muting configuration may be combined with other types of muting configurations, such as inter-instance muting, intra- instance muting, and intra-slot muting, e.g., using a logic function to combine the configurations. US 2020052845 A1 discloses a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The apparatus may be a UE. The apparatus may be a UE. The UE receives one or more positioning reference signal parameters from a base station. The UE determines resource elements in a transmission bandwidth carrying multiple positioning reference signals based on the positioning reference signal parameters. The UE decodes symbols in the resource elements. Overall prior art addresses DL/ UL PRS multiplexing and/ or muting only. In SL, the mechanism of DL PRS muting cannot be used directly, as there needs to be coordination among UEs in the SL PRS transmissions. When configuring SL PRS resource for SL positioning, each transmitting UE may choose its own comb size and RE offset parameters. If two or more UEs in proximity with each other choose same comb size and RE offset on same dedicated or shared RP, will lead to degradation in positioning performance. Simply avoiding SL-PRS resources occupied by other UEs is wasteful and can introduce unnecessary delays. Therefore, there is the need for a mechanism for UEs to coordinate their SL PRS resource parameter values. In accordance with aspects of the disclosure, the foregoing systems, methods, and apparatuses may be implemented in combination with one or more additional features, such as the following features whether alone or in combination. For example, the above systems, methods, and apparatuses may include determining, by the base station, a position of the UE based at least in part on. 202300039 - 15 - Other aspects, features, and implementations of the present disclosure will become apparent to a person having ordinary skill in the art, upon reviewing the following description of specific, example implementations of the present disclosure in conjunction with the accompanying figures. While features of the present disclosure may be discussed relative to particular implementations and figures below, all implementations of the present disclosure can include one or more of the advantageous features discussed herein. In other words, while one or more implementations may be discussed as having particular advantageous features, one or more of such features may also be used in accordance with the various implementations of the disclosure discussed herein. In similar fashion, while example implementations may be discussed below as device, system, or method implementations, such example implementations can be implemented in various devices, systems, and methods Methods to Coordinate Sidelink Positioning Reference Signal Transmission by user equipments proceeds the following steps Indication of SL PRS resource parameters Selection of comb size and RE offset Request for muting SL PRS transmissions SL PRS muting and indication. In some embodiments of the method according to the first aspect, the method is characterized by, that the Indication of SL PRS resource parameters the UE broadcasts and/or groupcasts comb size and RE offset values for its own SL PRS transmission in SCI of dedicated or shared RP. In some embodiments of the method according to the first aspect, the method is characterized by, that the Indication of SL PRS resource parameters modify IUC mechanism to indicate preferred and/or non-preferred comb size and RE offset values to other UE(s)/ SL location server. In some embodiments of the method according to the first aspect, the method is characterized by, that the UE transmits SL PRS or receives SL PRS transmission configuration from a gNB and/or LMF and/or SL location server. 202300039 - 16 - In some embodiments of the method according to the first aspect, the method is characterized by, that the UE chooses its comb size and RE offset so that the resulting SL PRS pattern does not overlap with other patterns that it has got to know of by decoding the SCI of other UEs. In some embodiments of the method according to the first aspect, the method is characterized by, that if a UE that needs to transmit SL PRS or receives SL PRS transmission configuration from the gNB and/or LMF and/or SL location server location server is unable to select a non-overlapping SL PRS pattern in Selection of comb size and RE offset, it requests neighboring UEs to mute their SL PRS transmissions In some embodiments of the method according to the first aspect, the method is characterized by, that if a UE receives a muting request, it evaluates and decides whether to mute its own SL PRS transmissions, and which repetitions/ occasions of its own transmission are to be muted. According to a second aspect, the present disclosure relates to an apparatus to Coordinate Sidelink Positioning Reference Signal Transmission by user equipments, the apparatus comprising a wireless transceiver, a processor coupled with a memory in which computer program instructions are stored, said instructions being configured to carry out a method according to any one of the embodiments of the first aspect. According to a third aspect, the present disclosure relates to a user Equipment comprising an apparatus according to any one of the embodiments of the second aspect According to a fourth aspect, the present disclosure relates to a wireless communication system for gNB-UE two side model control from a base station to a user equipment, wherein the base station comprises a processor coupled with a memory in which computer program instructions are stored, wherein the user equipment (UE) comprises a processor coupled with a memory in which computer 202300039 - 17 - program instructions are stored, said instructions being configured to implement steps of the claims 1 to 6. According to a fifth aspect, the present disclosure relates to a wireless communication system comprising at least one base station according according to any one of the embodiments of the present disclosure and at least one user equipment according to carry out a method according to any one of the embodiments of the first aspect. According to a sixth aspect, the present disclosure relates to a computer program product comprising instructions which, when executed by at least one processor, configure said at least one processor to carry out a method according to the first aspect said at least one processor to carry out a method for exchanging data according to any one of the embodiments of the present disclosure. The computer program product can use any programming language, and can be in the form of source code, object code, or in any intermediate form between source code and object code, such as in a partially compiled form, or in any other desirable form. According to a sixth aspect, the present disclosure relates to a computer-readable storage medium comprising instructions which, when executed by at least one processor, configure said at least one processor to carry out a method according to any one of the embodiments of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS Fig.1 shows comb-structure in frequency Fig.2 shows the repetition Fig.3 shows the muting Fig.4 shows the resources status of participant without inter-UE coordination Fig.5 shows the resources status of participant with inter-UE coordination Fig.6 shows the inventive flow The detailed description set forth below, with reference to annexed drawings, is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The 202300039 - 18 - detailed description includes specific details for the purpose of providing a thorough understanding of the various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In particular, although terminology from 3GPP 5G NR may be used in this disclosure to exemplify embodiments herein, this should not be seen as limiting the scope of the invention Some of the embodiments contemplated herein will now be described more fully with reference to the accompanying drawings. Other embodiments, however, are contained within the scope of the subject matter disclosed herein, the disclosed subject matter should not be construed as limited to only the embodiments set forth herein; rather, these embodiments are provided by way of example to convey the scope of the subject matter to those skilled in the art. Generally, all terms used herein are to be interpreted according to their ordinary meaning in the relevant technical field, unless a different meaning is clearly given and/or is implied from the context in which it is used. All references to a/an/the element, apparatus, component, means, step, etc. are to be interpreted openly as referring to at least one instance of the element, apparatus, component, means, step, etc., unless explicitly stated otherwise. The steps of any methods disclosed herein do not have to be performed in the exact order disclosed, unless a step is explicitly described as following or preceding another step and/or where it is implicit that a step must follow or precede another step. Any feature of any of the embodiments disclosed herein may be applied to any other embodiment, wherever appropriate. Likewise, any advantage of any of the embodiments may apply to any other embodiments, and vice versa. Other objectives, features and advantages of the enclosed embodiments will be apparent from the following description. In some embodiments, a more general term “network node” may be used and may correspond to any type of radio network node or any network node, which communicates with a UE (directly or via another node) and/or with another network node. Examples of network nodes are NodeB, MeNB, ENB, a network node belonging to MCG or SCG, base station (BS), multi-standard radio (MSR) radio node such as MSR BS, eNodeB, gNodeB, network controller, radio network controller 202300039 - 19 - (RNC), base station controller (BSC), relay, donor node controlling relay, base transceiver station (BTS), access point (AP), transmission points, transmission nodes, RRU, RRH, nodes in distributed antenna system (DAS), core network node (e.g. Mobile Switching Center (MSC), Mobility Management Entity (MME), etc), Operations & Maintenance (O&M), Operations Support System (OSS), Self Optimized Network (SON), positioning node (e.g. Evolved- Serving Mobile Location Centre (E-SMLC)), Minimization of Drive Tests (MDT), test equipment (physical node or software), etc. In some embodiments, the non-limiting term user equipment (UE) or wireless device may be used and may refer to any type of wireless device communicating with a network node and/or with another UE in a cellular or mobile communication system. Examples of UE are target device, device to device (D2D) UE, machine type UE or UE capable of machine to machine (M2M) communication, PDA, PAD, Tablet, mobile terminals, smart phone, laptop embedded equipped (LEE), laptop mounted equipment (LME), USB dongles, UE category Ml, UE category M2, ProSe UE, V2V UE, V2X UE, etc. Additionally, terminologies such as base station/gNodeB and UE should be considered non-limiting and do in particular not imply a certain hierarchical relation between the two; in general, “gNodeB” could be considered as device 1 and “UE” could be considered as device 2 and these two devices communicate with each other over some radio channel. And in the following the transmitter or receiver could be either gNodeB (gNB), or UE. As will be appreciated by one skilled in the art, aspects of the embodiments may be embodied as a system, apparatus, method, or program product. Accordingly, embodiments may take the form of an entirely hardware embodiment, an entirely software embodiment (including firmware, resident software, micro-code, etc.) or an embodiment combining software and hardware aspects. For example, the disclosed embodiments may be implemented as a hardware circuit comprising custom very-large-scale integration (“VLSI”) circuits or gate arrays, off- the-shelf semiconductors such as logic chips, transistors, or other discrete 202300039 - 20 - components. The disclosed embodiments may also be implemented in programmable hardware devices such as field programmable gate arrays, programmable array logic, programmable logic devices, or the like. As another example, the disclosed embodiments may include one or more physical or logical blocks of executable code which may, for instance, be organized as an object, procedure, or function. Furthermore, embodiments may take the form of a program product embodied in one or more computer readable storage devices storing machine readable code, computer readable code, and/or program code, referred hereafter as code. The storage devices may be tangible, non- transitory, and/or non-transmission. The storage devices may not embody signals. In a certain embodiment, the storage devices only employ signals for accessing code Any combination of one or more computer readable medium may be utilized. The computer readable medium may be a computer readable storage medium. The computer readable storage medium may be a storage device storing the code. The storage device may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, holographic, micromechanical, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the storage device would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random-access memory (“RAM”), a read-only memory (“ROM”), an erasable programmable read-only memory (“EPROM” or Flash memory), a portable compact disc readonly memory (“CD-ROM”), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain or store a program for use by or in connection with an instruction execution system, apparatus, or device. Code for carrying out operations for embodiments may be any number of lines and may be written in any combination of one or more programming languages including an object- oriented programming language such as Python, Ruby, Java, Smalltalk, 202300039 - 21 - C++, or the like, and conventional procedural programming languages, such as the “C” programming language, or the like, and/or machine languages such as assembly languages. The code may execute entirely on the user’s computer, partly on the user’s computer, as a stand-alone software package, partly on the user’s computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer may be connected to the user’s computer through any type of network, including a local area network (“LAN”), wireless LAN (“WLAN”), or a wide area network (“WAN”), or the connection may be made to an external computer (for example, through the Internet using an Internet Service Provider (“ISP”)). Furthermore, the described features, structures, or characteristics of the embodiments may be combined in any suitable manner. In the following description, numerous specific details are provided, such as examples of programming, software modules, user selections, network transactions, database queries, database structures, hardware modules, hardware circuits, hardware chips, etc., to provide a thorough understanding of embodiments. One skilled in the relevant art will recognize, however, that embodiments may be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of an embodiment. Reference throughout this specification to “one embodiment,” “an embodiment,” or similar language means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases “in one embodiment,” “in an embodiment,” and similar language throughout this specification may, but do not necessarily, all refer to the same embodiment, but mean “one or more but not all embodiments” unless expressly specified otherwise. The terms “including,” “comprising,” “having,” and variations thereof mean “including but not limited to,” unless expressly specified otherwise. An enumerated listing of items does not imply that any or all of the items are mutually exclusive, unless expressly specified otherwise. The terms “a,” “an,” and “the” also refer to “one or more” unless expressly specified otherwise. 202300039 - 22 - Aspects of the embodiments are described below with reference to schematic flowchart diagrams and/or schematic block diagrams of methods, apparatuses, systems, and program products according to embodiments. It will be understood that each block of the schematic flowchart diagrams and/or schematic block diagrams, and combinations of blocks in the schematic flowchart diagrams and/or schematic block diagrams, can be implemented by code. This code may be provided to a processor of a general-purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the fimctions/acts specified in the flowchart diagrams and/or block diagrams The code may also be stored in a storage device that can direct a computer, other programmable data processing apparatus, or other devices to function in a particular manner, such that the instructions stored in the storage device produce an article of manufacture including instructions which implement the function/act specified in the flowchart diagrams and/or block diagrams. The code may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus, or other devices to produce a computer implemented process such that the code which execute on the computer or other programmable apparatus provide processes for implementing the functions/acts specified in the flowchart diagrams and/or block diagrams. The flowchart diagrams and/or block diagrams in the Figures illustrate the architecture, functionality, and operation of possible implementations of apparatuses, systems, methods, and program products according to various embodiments. In this regard, each block in the flowchart diagrams and/or block diagrams may represent a module, segment, or portion of code, which includes one or more executable instructions of the code for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the Figures. For example, two blocks 202300039 - 23 - shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. Other steps and methods may be conceived that are equivalent in function, logic, or effect to one or more blocks, or portions thereof, of the illustrated Figures. Although various arrow types and line types may be employed in the flowchart and/or block diagrams, they are understood not to limit the scope of the corresponding embodiments. Indeed, some arrows or other connectors may be used to indicate only the logical flow of the depicted embodiment. For instance, an arrow may indicate a waiting or monitoring period of unspecified duration between enumerated steps of the depicted embodiment. It will also be noted that each block of the block diagrams and/or flowchart diagrams, and combinations of blocks in the block diagrams and/or flowchart diagrams, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and code. The description of elements in each figure may refer to elements of proceeding figures. Like numbers refer to like elements in all figures, including alternate embodiments of like elements. The detailed description set forth below, with reference to the figures, is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of the various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. For instance, although 3GPP terminology, from e.g., 5G NR, may be used in this disclosure to exemplify embodiments herein, this should not be seen as limiting the scope of the present disclosure. The disclosure is related to wireless communication system, which may be for example a 5G NR wireless communication system. More specifically, it represents a RAN of the wireless communication system, which is used exchange data with UEs via radio 202300039 - 24 - signals. For example, the RAN may send data to the UEs (downlink, DL), for instance data received from a core network (CN). The RAN may also receive data from the UEs (uplink, UL), which data may be forwarded to the CN. In the examples illustrated, the RAN comprises one base station, BS. Of course, the RAN may comprise more than one BS to increase the coverage of the wireless communication system. Each of these BSs may be referred to as NB, eNodeB (or eNB), gNodeB (or gNB, in the case of a 5G NR wireless communication system), an access point or the like, depending on the wireless communication standard(s) implemented. The UEs are located in a coverage of the BS. The coverage of the BS corresponds for example to the area in which UEs can decode a PDCCH transmitted by the BS. An example of a wireless device suitable for implementing any method, discussed in the present disclosure, performed at a UE corresponds to an apparatus that provides wireless connectivity with the RAN of the wireless communication system, and that can be used to exchange data with said RAN. Such a wireless device may be included in a UE. The UE may for instance be a cellular phone, a wireless modem, a wireless communication device, a handheld device, a laptop computer, or the like. The UE may also be an Internet of Things (IoT) equipment, like a wireless camera, a smart sensor, a smart meter, smart glasses, a vehicle (manned or unmanned), a global positioning system device, etc., or any other equipment that may run applications that need to exchange data with remote recipients, via the wireless device. The wireless device comprises one or more processors and one or more memories. The one or more processors may include for instance a central processing unit (CPU), a digital signal processor (DSP), a field-programmable gate array (FPGA), an application specific integrated circuit (ASIC), etc. The one or more memories may include any type of computer readable volatile and non-volatile memories (magnetic hard disk, solid-state disk, optical disk, electronic memory, etc.). The one or more memories may store a computer program product, in the form of a set of program-code instructions to be executed by the one or more processors to implement all or part of the steps of a method for exchanging data, performed at a UE’s side, according to any 202300039 - 25 - one of the embodiments disclosed herein. The wireless device can comprise also a main radio, MR, unit. The MR unit corresponds to a main wireless communication unit of the wireless device, used for exchanging data with BSs of the RAN using radio signals. The MR unit may implement one or more wireless communication protocols, and may for instance be a 3G, 4G, 5G, NR, WiFi, WiMax, etc. transceiver or the like. In preferred embodiments, the MR unit corresponds to a 5G NR wireless communication unit. For potential solutions to SL positioning, regarding SL PRS, following agreements were made in RAN1#111 With regards to the configuration/activation/deactivation/triggering of SL-PRS study the following three options are settled: ▪ 1: High-layer-only signaling involvement in the SL-PRS configuration No Lower layer involvement, e.g., SL-MAC-CE or SCI or DCI, for the activation or the triggering of a SL-PRS. Based on the study, this option may correspond to ^ A SL-PRS configuration that is a single-shot or multiple shots ^ A high-layer configuration that may be received from an LMF, a gNB, or a UE ▪ 2: High-layer and lower-layer signaling involvement in the SL-PRS configuration Lower-layer may correspond to SL-MAC-CE, or SCI, or DCI For example, high layer signaling can may be used for SL-PRS configuration and lower layer signaling can may be used for initiating SL positioning and/or configuration/triggering/activating/deactivating/indicating and potential resource indication/reservation transmission of SL-PRS. ▪ 3: Only lower-layer signaling involvement in the SL-PRS configuration Lower-layer may correspond to SL-MAC-CE, or SCI, or DCI With regards to SL signaling of the reservation/indication of SL-PRS resource(s) for dedicated resource pool and shared resource pool (if supported) for positioning: 202300039 - 26 - Option A.1: SCI can be used for reserving/indicating one or more SL-PRS resource(s). This does NOT mean that only SCI is being used. There can still be higher layer signaling for the purpose of indicating a part of SL-PRS configuration. FFS: Whether SCI is single stage SCI or two stage SCI FFS: SL-MAC-CE or other higher-layer signaling reservation/indication Background: SL-PRS and DL-PRS SL positioning involves transmission of SL PRS signals by UE(s) over the SL. For the sequence of the new reference signal for SL positioning/ranging, use Alt.1: pseudorandom-based. Use existing sequence of DL-PRS as a starting point. DL-PRS are transmitted by gNB(s) for DL positioning measurements by UE(s). DL-PRS: QPSK modulated by standardized 31-bit Gold code sequence initialized based on DL PRS sequence ID (values from 0 to 4095). Fig.1 shows the background situation for DL-PRS comb structure. Each symbol of DL PRS: comb-structure in frequency (comb value ^ = 2,4,6,12). The Length of DL- PRS within one slot: multiple of ^, position of first symbol within slot flexible Fig.2 and Fig.3 show the DL-PRS muting. Muting means the way to mitigate interference, which can be used either at repetition level or at occasion level. Fig.4 shows the resources status of participants without inter-UE coordination. This illustration shows the coordination info from UE-A to UE-B wherein preferred and/or non-preferred resources for UE-B’s transmission. Fig.5 shows the resources status of participants with inter-UE coordination and shows presence of potential resource conflict on resources indicated by UE-B’s SCI Fig.6 shows the flow The steps of the inventive flow are ^ Indication of SL PRS resource parameters ^ Selection of comb size and RE offset ^ Requestfor muting SL PRS transmissions 202300039 - 27 - ^ SL PRS muting and indication Step 1 Indication of SL PRS resource parameters: A UE/ gNB/ LMF/ SL location server which configures an SL PRS transmission may indicate the comb size and RE offset parameters to be used, within the higher layer configuration of SL PRS. However, this configuration is accessible only to those UEs that are required to transmit the SL PRS according to it, and not accessible to other UEs transmitting SL PRS in the same RP. To prevent overlap in SL PRS pattern for multiple UEs transmitting SL PRS, need the SL PRS configuration to be shared to other UEs transmitting in same RP also. Even if SL PRS transmission is configured by a gNB/ LMF/ SL location server, it is required that the comb size and RE offset will always be configured by the transmitting UE. Indication of SL PRS resource parameters can be made using any of the following mechanisms. Each UE broadcasts/ groupcasts comb size and RE offset values for its own SL PRS transmission in SCI of dedicated or shared RP. The advantage is easy to implement. Broadcast/ groupcast may not be required in all cases, since not all UEs (e.g., those without SL positioning capability but using same shared RP) need this information; this can be overcome e.g., by broadcasting this information in the 2nd SCI, which needs to be decoded only by those UEs that need this information. Modify IUC mechanism to indicate preferred and/or non-preferred comb size and RE offset values to other UE(s)/ SL location server. The Advantage would be less signaling overhead in SL compared to broadcast/groupcast. It must be taken into account that this may not be able to indicate to all relevant UEs at once. Indication contains at least: UE ID, comb size of SL PRS, RE offset of SL PRS, transmission duration and/or period. Step 2 Selection of comb size and RE offset: When any UE needs to transmit SL PRS or receives a configuration for transmitting SL PRS from a gNB/ LMF/ SL location server, it chooses the comb size and RE offset so that it does not overlap with existing SL PRS transmissions as detected in the indication of step 1. Selection of comb size and RE offset is based on the indication in step 1, each UE when it needs to transmit SL PRS or receives SL PRS 202300039 - 28 - transmission configuration from a gNB/ LMF/ SL location server, chooses its comb size and RE offset so that the resulting SL PRS pattern does not overlap with others being used by its neighbors. Such a non-overlapping pattern can be randomly chosen from the remaining nonoverlapping comb size and RE offset combinations. Once a UE selects an SL PRS pattern it must indicate the corresponding comb size and RE offset along with the SL PRS transmission as outlined in step 1 Step 3 Request for muting SL PRS transmissions: If any UE that needs to transmit SL PRS or receives a configuration for SL PRS transmission from a gNB/ LMF/ SL location server does not find non-overlapping comb size and RE offset values to choose from based on the indications in step 1, it can send a request for muting SL PRS to other UE(s) Request for muting SL PRS transmissions: If a UE that needs to transmit SL PRS or receives SL PRS transmission configuration from the gNB/ LMF/ SL location server is unable to select a non-overlapping SL PRS pattern as outlined in step 2, it requests neighboring UEs to mute their SL PRS transmissions. Request for muting can be sent either using broadcast or groupcast SL communication; groupcast can be based on geographical regions or directly to specific UE IDs. If the positioning procedure is using a dedicated RP for positioning, request for muting can be sent either using a data channel within the dedicated RP, or over the PSSCH using a SL communication RP. If the positioning procedure is using a shared RP with communication, request for muting can be sent over a communication channel (e.g., PSSCH) in the shared RP Request for muting contains at least the following information: Priority: a priority index for the positioning operation/ session. Below information can optionally be sent in the request for muting: Muting duration: indicates the time duration for which muting should be in force Muting repetitions/ occasions: indicates the desired SL PRS repetitions/ occasions within the muting duration where muting is required Step 4 SL PRS muting and indication: 202300039 - 29 - If a UE receives request for muting its SL PRS transmissions by other UE(s), it must mute its SL PRS transmissions based on the priority value indicated in the muting request and its own positioning priority. It then sends indication of this muting pattern activation to other nodes. If a UE that is about to transmit SL PRS requested for muting but did not receive any muting indication from any UE, then can proceed to select a comb size and RE offset value which is least used by other UEs, or select a comb size and RE offset value at random. Indication of SL PRS muting: If a UE receives a muting request, it evaluates and decides whether to mute its own SL PRS transmissions, and which repetitions/ occasions of its own transmission are to be muted. Decision to mute is taken based on priority indication in request; if priority of own positioning session is less than that indicated in muting request, then the UE must mute its own SL PRS transmissions. Muting repetitions/ occasions must follow those in the request as closely as possible This can be ensured by having a common table associating similarity in muting patterns to the difference in priority indexes. Measure for similarity between muting patterns is introduced, e.g., inverse of number of repetitions/ occasions where muting patterns are different. Table is constructed such that higher difference in priority implies lower similarity in muting request. e.g., if muting request indicates priority 1 (highest) and the current positioning session of a UE which received this request is 3 (lower) difference in priority is 2 and muting pattern chosen by the receiver UE must have appropriate similarity score with muting pattern in request, as indicated by priority difference vs. similarity table; Once the UE which received the muting request has chosen the muting pattern, it indicates the activation of the muting to all UEs around. The indication is sent either by broadcasting it in the SCI associated with the dedicated/ shared RP being used for positioning or by broadcasting/ groupcasting it to other UEs via a SL communication channel (e.g., PSSCH). The indication contains at least a bitmap of muting pattern. The muting pattern can be indicated in the form of a bitmap with 0s where SL PRS muting will be active and 1s where the SL PRS muting will be 202300039 - 30 - inactive, or vice-versa. Optionally the indication can also contain a time duration or similar measure for which muting pattern will be active and a periodicity of muting pattern. The Comb-based multiplexing from different UEs in the same slot is suggested is supported for dedicated resource pools by this application. Further it is possible to have multiple (M,N) values, which are named as resource patterns in this application, for comb-based multiplexing in a dedicated resource pool, although the patterns with different (M,N) values are only allowed to be transmitted at different times within a slot (time division multiplexed (TDM)). That even for one (M,N) value in a particular TDM slot used by different UEs, the patterns transmitted by different UEs can overlap in that TDM slot if they choose the same RE offset value. Therefore, this application is given as solution additionally In this application any UE that receives such a configuration should also indicate this to other UEs, with the other UEs being able to change their own patterns to avoid collision/overlap. so the application provides a method for UE coordination to avoid overlap in SL PRS transmissions, this means this application is enhancing positioning performance.

202300039 - 31 - Abbreviations: 3GPP Third generation partnership project CE Control element DCI Downlink control information DL Downlink LMF Location management function MAC Medium access control PC Power control PRS Positioning reference signal PSSCH Physical sidelink shared channel QPSK Quadrature phase shift keying RAN Radio access network RE Resource element RP Resource pool SCI Sidelink control information SI Study item SL Sidelink UE User equipment WI Work item

Claims

202300039 - 32 - Claims: 1. Methods to Coordinate Sidelink Positioning Reference Signal Transmission by user equipment proceeds with the following steps ^ Indication of SL PRS resource parameters ^ Selection of comb size and RE offset ^ Request for muting SL PRS transmissions ^ SL PRS muting and indication. 2. Method according to claim 1, wherein the Indication of SL PRS resource parameters the UE broadcasts and/or groupcasts comb size and RE offset values for its own SL PRS transmission in SCI of dedicated or shared RP. 3. Method according to claim 1 or 2, wherein the Indication of SL PRS resource parameters modify IUC mechanism to indicate preferred and/or non-preferred comb size and RE offset values to other UE(s)/ SL location server. 4. Method according to one of the forementioned claims, wherein the UE chooses its comb size and RE offset so that the resulting SL PRS pattern does not overlap with other patterns that it has got to know of by decoding the SCI of other UEs. 5. Method according to one of the forementioned claims, if a UE that needs to transmit SL PRS or receives SL PRS transmission configuration from the gNB and/or LMF and/or SL location server is unable to select a non-overlapping SL PRS pattern in Selection of comb size and RE offset as in claim 5,, it requests neighboring UEs to mute their SL PRS transmissions. 6. Method according to one of the forementioned claims, wherein the if a UE receives a muting request, it evaluates and decides whether to mute its own SL PRS transmissions, and which repetitions/ occasions of its own transmission are to be muted. 202300039 - 33 - 7. Apparatus to Coordinate Sidelink Positioning Reference Signal Transmission by user equipments, the apparatus comprising a wireless transceiver, a processor coupled with a memory in which computer program instructions are stored, said instructions being configured to implement steps of the claims 1 to 6. 8. User Equipment comprising an apparatus according to claim 7. 9. Wireless communication system for gNB-UE two side model control from a base station to a user equipment, wherein the base station comprises a processor coupled with a memory in which computer program instructions are stored, wherein the user equipment (UE) comprises a processor coupled with a memory in which computer program instructions are stored, said instructions being configured to implement steps of the claims 1 to 6.