EP4690605A1

EP4690605A1 - A method for configuring sidelink positioning resources for communication of sidelink reference signals for positioning, a node and a wireless device

Info

Publication number: EP4690605A1
Application number: EP24711150.3A
Authority: EP
Inventors: Basuki PRIYANTO; Yujie Zhang
Original assignee: Sony Europe BV; Sony Group Corp
Current assignee: Sony Europe BV; Sony Group Corp
Priority date: 2023-03-31
Filing date: 2024-03-08
Publication date: 2026-02-11
Also published as: WO2024199950A1; JP2026511573A; CN120958762A

Abstract

A method is disclosed performed by a node in a communication network, for configuring sidelink positioning resources for communication of sidelink reference signals for positioning between a plurality of WDs. The method comprises transmitting, to a first WD of the plurality of WDs, a sidelink positioning resource configuration. The sidelink positioning resource configuration comprises information indicative of a plurality of resource structure schemes to be used for communication of sidelink reference signals for positioning.

Description

A METHOD FOR CONFIGURING SIDELINK POSITIONING RESOURCES FOR COMMUNICATION OF SIDELINK REFERENCE SIGNALS FOR POSITIONING, A NODE AND A WIRELESS DEVICE

The present disclosure pertains to the field of wireless communications. The present disclosure relates to a method for configuring sidelink positioning resources for communication of sidelink reference signals for positioning between a plurality of WDs, a related node and a related wireless device.

BACKGROUND

Positioning is an important feature of the 3rd Generation Partnership Project (3GPP) Fifth Generation (5G) New Radio (NR), targeting high accuracy positioning of wireless devices. The radio access technology (RAT) dependent positioning in 3GPP has been established by utilizing reference signals transmission using an interface between a radio network node and a wireless device (WD), which interface may be referred to as a direct-link or Uu interface. For positioning in NR, sidelink positioning has been considered as an alternative to direct-link positioning. In this case, the positioning procedure is performed by utilizing reference signals transmission using an interface between wireless devices (WDs), which interface may be referred to as a sidelink (SL) or PC5 interface.

In SL, resources can be allocated for one-to-one communication (such as unicast, where one resource may be dedicated for one receive WD) and one-to-many communication (such as groupcast and/or broadcast, where one resource is shared by a plurality of receive WDs). For positioning purposes, the transmission of sidelink reference signals for positioning is needed for enabling positioning measurement and estimation. Transmission of SL reference signals for positioning may be required from multiple WDs (for example many-to-one, many-to-many, or one-to-many) are required for multi-lateration in the position estimation process. However, these WDs may have different requirements in term of accuracy and transmission cast type, and/or capabilities when it comes to communication of sidelink reference signals.

SUMMARY

There is a need for improving the resource allocation for transmission of sidelink reference signals for positioning to allow multiple WDs to occupy common resource(s) for positioning within the sidelink framework.

Accordingly, there is a need for devices and methods for managing positioning reference signal transmission between a plurality of wireless devices, which may mitigate, alleviate or address the shortcomings existing and may provide an improved utilization of radio resources.

Further, a node is provided, the node comprising memory circuitry, processor circuitry, and a wireless interface, wherein the node is configured to perform any of the methods disclosed herein and relating to the node.

By providing the information indicative of a plurality of resource structure schemes, the node may configure a plurality of resource structure schemes to be used for sidelink positioning. Sidelink reference signals for positioning can thus be transmitted by a sidelink reference signal transmitting wireless device using the plurality of resource structure schemes within a sidelink resource pool, thereby enabling a plurality of WDs having different capabilities and/or requirements to receive sidelink positioning reference signals within a same sidelink resource pool. By providing resources for transmission of sidelink positioning reference signals using a plurality of resource structure schemes in the same sidelink resource pool, a more efficient use of available resources can be provided.

A method is provided, performed by a first WD in a communication network, for configuring sidelink positioning resources for communication of sidelink reference signals for positioning between the first WD and a second WD. The method comprises receiving, from a node, a sidelink positioning resource configuration. The sidelink positioning resource configuration comprises information indicative of a plurality of resource structure schemes to be used for communication of sidelink reference signals for positioning.

Further, a first wireless device is provided, the first wireless device comprising memory circuitry, processor circuitry, and a wireless interface, wherein the wireless device is configured to perform any of the methods disclosed herein and relating to the wireless device.

By receiving the information indicative of a plurality of resource structure schemes, the wireless device may be configured with a plurality of resource structure schemes to be used for sidelink positioning. The wireless device can thus be configured to transmit or receive sidelink reference signals for positioning using one or more of the plurality of resource structure schemes within a sidelink resource pool, thereby enabling WDs having different capabilities and/or requirements to communicate sidelink positioning reference signals within a same sidelink resource pool. By providing resources for transmission of sidelink positioning reference signals using a plurality of resource structure schemes in the same sidelink resource pool, a more efficient use of available resources can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

The above and other features and advantages of the present disclosure will become readily apparent to those skilled in the art by the following detailed description of examples thereof with reference to the attached drawings, in which:

Fig. 1 is a diagram illustrating an example wireless communication system comprising an example network node and an example wireless device according to this disclosure,

Fig. 2 is a diagram illustrating an allocation of legacy Downlink Positioning Reference Signal (DL-PRS) using a Comb-6 resource allocation structure,

Fig. 3A-3C are diagrams illustrating example allocations of resource structure schemes for sidelink reference signals for positioning according to this disclosure,

Fig. 4 is a flow-chart illustrating an example method, performed in a node, for configuring sidelink positioning resources for communication of sidelink reference signals for positioning between a plurality of WDs according to this disclosure,

Fig. 5 is a flow-chart illustrating an example method, performed in a wireless device for configuring sidelink positioning resources for communication of sidelink reference signals for positioning between a plurality of WDs according to this disclosure,

Fig. 6 is a block diagram illustrating an example node according to this disclosure, and

Fig. 7 is a block diagram illustrating an example wireless device according to this disclosure.

DETAILED DESCRIPTION

Various examples and details are described hereinafter, with reference to the figures when relevant. It should be noted that the figures may or may not be drawn to scale and that elements of similar structures or functions are represented by like reference numerals throughout the figures. It should also be noted that the figures are only intended to facilitate the description of the examples. They are not intended as an exhaustive description of the disclosure or as a limitation on the scope of the disclosure. In addition, an illustrated example needs not have all the aspects or advantages shown. An aspect or an advantage described in conjunction with a particular example is not necessarily limited to that example and can be practiced in any other examples even if not so illustrated, or if not so explicitly described.

The figures are schematic and simplified for clarity, and they merely show details which aid understanding the disclosure, while other details have been left out. Throughout, the same reference numerals are used for identical or corresponding parts.

Fig. 1 is a diagram illustrating an example wireless communication system 1 comprising an example radio network node 400, an example core network node 600, and one or more wireless device(s) 300, such as a first WD 300A and a second WD 300B. The first WD 300A may be a target wireless device, and the second WD 300B may be an assisting WD 300B according to this disclosure. In one or more examples, the target wireless device 300A is a moving WD. In one or more examples, the assisting wireless device 300B is a WD having a known, such as a fixed location. As discussed in detail herein, the present disclosure relates to a wireless communication system 1 comprising a cellular system, for example, a 3GPP wireless communication system.

A radio network node disclosed herein refers to a radio access network node operating in the radio access network, such as a base station, an evolved Node B, eNB, gNB in NR. In one or more examples, the RAN node is a functional unit which may be distributed in several physical units. A radio network node has at least one transmission and reception point (TRP) for the communication with the wireless device(s).

A core network, CN, node disclosed herein refers to a network node operating in the core network, such as in the Evolved Packet Core Network, EPC, and/or a 5G Core Network, 5GC. Examples of CN nodes in EPC include a Mobility Management Entity, MME and/or a positioning node, such as a Location Management Function (LMF).

In one or more examples, the CN node is a functional unit which may be distributed in several physical units.

The wireless communication system 1 described herein may comprise one or more wireless devices 300, and/or one or more radio network nodes 400. The radio network nodes may be one or more of a base station, an eNB, a gNB and/or an access point. The one or more WDs 300 may comprise moving WDs, such as vehicles and/or VRUs (pedestrians, bikers, etc.), and WDs having fixed locations, such as RSUs.

A WD may refer to a mobile device and/or a user equipment (UE). The one or more wireless devices 300, 300a, 300B may be configured to communicate with the network node 400 via a wireless link (or radio access link) 10. The wireless link 10 may be set up via a Uu interface between the one or more WDs and the radio network node 400.

The core network node 600 may be configured to communicate with the radio network node 400 via a link 12, such as a wired and/or wireless link, and/or with the one or more wireless devices 300, 300A, via the radio network node 400.

The wireless devices 300, 300A, 300B may be configured to communicate directly with each other via a sidelink 20, such as without communicating via the radio network node 400. The sidelink 20 may be a wireless link, such as via a PC5 interface.

Positioning of one or more of the WDs 300 may be performed using different techniques, such as sidelink positioning and/or direct-link positioning. The sidelink positioning uses the PC5 interface, such as the sidelink 20, to communicate sidelink reference signals for positioning between a plurality of WDs 300. The direct-link positioning uses the Uu interface between the WD to be positioned and one or more radio network nodes, such as the wireless link 10.

During sidelink positioning, there are two types of WDs that are interacting, as described in 3GPP TR 38.859 Version 18.0.0. The first type of WD is the WD to be positioned, which may herein be referred to as a target WD 300A. The term target WD can be used for the WD to be positioned both in sidelink positioning and/or direct-link positioning. The second type of WD interacting during the sidelink positioning is a WD supporting positioning of target UE, for example by transmitting and/or receiving reference signals for positioning and/or providing positioning-related information over the SL interface. The second type of WD may herein be referred to as an assisting WD 300B. The assisting WD is a WD assisting the target WD in the positioning procedure. The assisting WD may have a known, such as a fixed location, or may be a moving WD, such as a WD having a position that varies over time. When the assisting WD meets certain requirements, such as when the position and/or location is known or fixed, the assisting WD 300B may be referred to as an anchor WD, in accordance with 3GPP TR 38.859.

Sidelink (SL) positioning is currently discussed in 3GPP Rel-18, for enabling a positioning estimate to be obtained based on the sidelink reference signal for positioning. SL positioning has defined two types of resource pools (RPs): shared RPs, and dedicated RPs. Shared RPs allow for the sharing of resources between sidelink reference signals for positioning and legacy sidelink transmissions carried by a sidelink physical channel, such as a Physical Sidelink Control Channel (PSCCH) and/or a Physical Sidelink Shared Channel (PSSCH), while dedicated RPs only allow for signals and/or channels intended for positioning purposes.

The Positioning Reference Signal (PRS) transmission in legacy NR positioning may be multiplexed either in time-domain or frequency domain. The multiplexing may be accommodated by arranging the resource allocations of PRS. The resource allocation of downlink PRS may adopt a Comb structure. The Comb structure in general is described by two parameters: a Comb size (M) and a number of occupied Orthogonal Frequency Division Multiplexing (OFDM) symbols (N). The comb size M can herein be seen as an offset between two allocated resource elements in the frequency domain. Fig. 2 illustrates an example of a slot in which resources for PRS are allocated using a Comb-6 comb structure. Within an OFDM symbol of the example slot, the PRS from a first gNB (gNB#1) is allocated every 6th sub-carrier in each physical resource block (PRB) in the frequency domain (F). In the time domain (T), one entire comb pattern occupies six symbols. Hence, this comb structure is referred to as Comb-6 (M = 6, N = 6). In the example shown in Fig. 2, the comb pattern is repeated so that two entire comb patterns are used in the slot, thus in total twelve symbols are occupied by PRS from gNB#1 in a slot. Furthermore, PRS from a second gNB (gNB#2) and a third gNB (gNB#2) are also allocated in sub-sequent OFDM symbol(s) in a staggered manner. The PRS allocation for gNB#2 and gNB#3 uses the same comb structure as gNB#1 but with different comb offsets. In the time-domain this means, that PRS from different gNB(s) are allocated in different slots. Hence, one comb offset to be applied to the resource allocation may be a time offset parameter, such as a PRS slot offset. For SL-positioning, the Comb-M structure is to be supported. According to this disclosure, a Comb-M structure where M>1 refers to a Frequency Division Multiplexing (FDM) of sidelink reference signals for positioning, while a Comb-M structure where M=1 refers to (Time-Division Multiplexing (TDM) of sidelink reference signals for positioning.

In legacy NR positioning, the transmission and reception of DL-PRS is between UE and gNB. However, in sidelink NR positioning, the transmission and reception of reference signals for positioning is between WDs. The operation of sidelink reference signal transmission for positioning, such as the allocation of resources for transmission of sidelink reference signals for positioning, may be controlled using two different schemes, Sidelink Positioning Scheme-1 and Sidelink Positioning Scheme-2, hereinafter referred to as Scheme-1 and Scheme-2. In Scheme- 1 the operation of sidelink reference signal transmission for positioning is controlled by a radio network node, such as a gNB, for one or more WDs within a cell. In Scheme-2 a plurality of WDs may interact with each other, such as control the operation of sidelink reference signal transmission for positioning, without involvement from any radio network node. Furthermore, the interaction between WDs in sidelink positioning can be one WD to another WD, many WDs to one WD, and one WD to many WDs. Hence, the resource allocation of sidelink reference signals for positioning should be flexibly designed to support multiplexing of sidelink reference signals for positioning from different sidelink reference signal transmitting WD(s) and also for different transmission or cast types, such unicast or groupcast.

It is an object of the current disclosure to provide a resource allocation of sidelink reference signals for positioning within a resource pool that can accommodate sidelink reference signal transmissions for positioning from various WDs that may have different requirements, such as in terms of accuracy and in terms of transmission cast type, and/or capabilities.

Furthermore, different WDs may have different capabilities in processing multiplexed resources. Some WDs may prefer TDM over FDM, for example due to low hardware design requirements, while other WDs may prefer FDM based allocation schemes for the flexibility it offers in resource management. Typically, FDM requires precise synchronization of a center frequency to avoid resource inference between different WDs, and also high requirement on low noise amplifier (LNA) design to handle power impairment among multiple multiplexed resources in the frequency domain. Despite its higher hardware design requirements, FDM offers benefits such as a more flexible resource allocation design and improved power efficiency for wideband signal. In comparison with TDM, comb structure signals offer better performance in channel sounding and positioning.

According to the current disclosure, a sidelink resource pool is provided that can be configured to support different types of resource structures, such as resource structure schemes, for transmitting sidelink reference signals for positioning, such as sidelink positioning reference signals (SL-PRSs). The sidelink resource pool is configured to accommodate a multiplexing of sidelink reference signals for positioning from different WDs, such as in different time allocation using time-division multiplexing (TDM) and/or interleaved in sub-carrier frequency allocation (frequency-division multiplexing (FDM). In one or more examples herein, TDM and FDM may correspond to different comb-structures, where a comb structure Comb-1 corresponds to TDM and a comb structure Comb>1 corresponds to FDM.

In one or more example methods, an entire resource allocation for sidelink reference signals for positioning within a resource pool is configured with a single type of resource structure, such as configured for either TDM or FDM. Alternatively, the resource allocation may be divided into subsets, such as sub-resources, in which each subset (such as a slot) can have its own resource structure for sidelink reference signal transmission. In this example, the entire resource allocation for sidelink reference signals support at least two different sidelink reference signal resource structures. In one or more example methods, the subset may be one or more symbols within a slot, such that at least two different sidelink reference signal resource structures are supported within one slot.

Figs. 3A-3C illustrate example allocations of resource structure schemes for sidelink reference signals for positioning according to the current disclosure. In the examples shown in Figs. 3A-3C, two example types of resource structure schemes are disclosed, Comb-6 and Comb-1. Comb-6 corresponds to FDM. For the Comb-1 resource structure scheme, the resources are offset by 1 OFDM sub-carrier in the frequency domain, which corresponds to all resource elements in one OFDM symbol of the sub-channel within a resource pool being allocated to one WD or one group of WDs. The sub-channel size can be as wide as the resource pool. In case of Comb > 1 , the SL-PRSs from other WD(s) can be interleaved in other sub-carrier with different offset.

Comb-1 thus corresponds to TDM. The two different types of resource structure schemes are applied to resources for transmission of sidelink reference signals for positioning for a plurality of example WDs, such as an example WD1 , an example WD2 and an example WD3. In case of Comb-1 , the SL-PRSs from other WD(s) can be allocated in different OFDM symbol(s).

Fig. 3A illustrates an example allocation of the two types of resource structure schemes, wherein the FDM, such as Comb-6, type resource structure scheme and the TDM, such as the Comb-1 , type resource structure scheme are allocated in respective sidelink resource pools. In the example shown Fig. 3A, the FDM resources are allocated in a first sidelink resource pool, herein referred to as SL Resource pool #1 . In the example shown Fig. 3A, the TDM resources are allocated in a second sidelink resource pool, herein referred to as SL Resource pool #2. In this example, the sub-channel for SL-PRS is with the same bandwidth as the resource pool.

Fig. 3B illustrates an allocation of the two types of resource structure schemes according to one or more examples herein. In the example shown in Fig. 3B, the FDM type resource structure scheme and the TDM type resource structure schemes are allocated in a respective subset of resources within a same sidelink resource pool, such as in respective sidelink resources, such as SL resource #1 for FDM and SL resource #2 for TDM. A sidelink resource for positioning can occupy multiple OFDM symbols in a slot and/or multiple slot(s). Each sidelink resource can herein be seen as a subset of the sidelink resource pool. The respective sidelink resources, such as the subset of resources, allocated to the different types of resource structure schemes, may be separated by a guard period to reduce the interference between sidelink reference signals for positioning for different WDs. In other words, only one type of sidelink resource configuration scheme may be allowed in each sidelink resource within a resource pool.

Fig. 3C illustrates an allocation of the two types of resource structure schemes according to one or more examples herein. In the example shown in Fig. 3C, the FDM type resource structure scheme and the TDM type resource structure scheme are allocated in a respective subset of resources within a same sidelink resource, such as within a first sidelink resource, herein referred to as SL resource #1 . A sidelink resource for positioning can occupy multiple OFDM symbols in a slot and/or multiple slot(s). Each subset of resources may comprise a subset of the resource elements comprised in the sidelink resource. The respective subset of resources allocated to the different types of resource structure schemes may be separated by a guard period TG to reduce the interference between sidelink reference signals for positioning for different WDs. In other words, more than one type of sidelink resource configuration scheme may be allowed in each sidelink resource within a resource pool.

In one or more example methods, such as when both types of resource structure schemes are supported in the same resource pool, such as in the examples shown in Fig. 3B and 3C, a guard period may be provided between the resources for the different types of resource structure schemes. In one or more example methods, such as when both types of resource structure schemes are supported in the same resource pool, a common control channel resource for conveying the resource structure schemes and the allocated resources for the respective resource structure scheme is provided. This may for example be the case when the different resource structure schemes for transmitting sidelink reference signals for positioning are allocated in a same, such as in one, slot.

In one or more example methods, such as when both types of resource structure schemes are supported in the same resource pool, such as in the examples shown in Fig. 3B and 3C, there is an association of TDM and FDM resource structure schemes. This may for example be the case when different resource structure schemes, such as resource structure configuration, for transmitting sidelink reference signals for positioning are allocated in the same slot. In one or more example methods, a look up table comprising the supported configuration, such as the supported resource allocations, for each resource structure scheme may be provided. The look up table may comprise supported configurations, such as supported resource allocations, a plurality of resource structure schemes.

Fig. 4 shows a flow diagram of an example method 100, performed by a node in a communication network according to the disclosure, for configuring sidelink positioning resources for communication of sidelink reference signals for positioning between a plurality of WDs. The node is the node 800 of Fig. 6. The node 800 may be one or more of the radio network node 400 of Fig. 1 , a core network node 600, and the sidelink reference signal transmitting WD 300A of Fig. 1.

In one or more example methods, the method comprises receiving S101 , from a first WD of the plurality of WDs, information indicative of the first WD’s capability to process one or more of the plurality of resource structure schemes. The information indicative of the first WD’s capability may be transmitted as a capability report. The first WD may be a sidelink reference signal receiving WD 300B. In one or more example methods, such as when the node is a radio network node or a core network node, receiving S101 may comprise receiving from a second WD, such as a sidelink reference signal transmitting WD 300A, information indicative of the second WD’s capability to process one or more of the plurality of resource structure schemes. The information indicative of the first WD’s, and/or the second WD’s, capability to process one or more of the plurality of resource structure schemes may be indicative of the first WD’s capability on processing multiplexed resources for sidelink reference signals for positioning. The node may receive the information indicative of the first WDs capability to process one or more of the plurality of resource structure schemes in response to transmitting a request for a capability report to the first wireless device.

The capability can be indicated in the form of a hard value, such as 1 for full capability and 0 for no capability. The first WD may indicate its capability of processing time-division multiplexed sidelink reference signals for positioning and its capability of processing frequencydivision multiplexed sidelink reference signals for positioning individually. In one or more examples, the capability of processing time-division multiplexed sidelink reference signals for positioning and/or frequency-division multiplexed sidelink reference signals for positioning according to the following table. For example, Multiplexing capability “01” means the WD only support FDM. Multiplexing capability “10” means the WD only support FDM. Multiplexing capability “11” means the WD only support both FDM and TDM. In another example, it can be the case where a multiplexing scheme is a default scheme where all WDs have to support it. Multiplexing capability “0” means the WD only support FDM (in case FDM is the default). Multiplexing capability “1” means the WD support both FDM and TDM.

In one or more example methods, the information indicative of the first WDs capability to process one or more of the plurality of resource structure schemes may be indicative of the first WD’s capability and/or preference on using either a common resource pool or a dedicated TDM/FDM resource pools to the node, such as to the radio network node and/or to a sidelink reference signal transmitting WD. In one or more example methods, the information indicative of the first WD’s capability, such as the capability report, is transmitted directly from the first WD, such as the reference signal receiving WD, to a radio network node, such as the radio network node serving the first WD, via higher layer signaling, such as RRC protocol. In one or more example methods, the information indicative of the first WD’s capability, such as the capability report, is transmitted indirectly via a sidelink reference signal transmitting WD. In other words, in one or more example methods, the sidelink reference signal receiving WD conveys the capability report to sidelink reference signal transmitting WD first and the sidelink reference signal transmitting WD forwards it to the radio network node, such as to a gNB, and/or to a positioning node, such as a Location Management Function (LMF).

In one or more example methods, such as in SL positioning scheme 1 , the first WD, such as the sidelink reference signal receiving WD, indicates its capability in processing time division multiplexed (TDMed) and/or frequency division multiplexed (FDMed) reference signals for sidelink positioning to the node, such as the radio network node, to enable the radio network node to dynamically adjust the multiplexing mode for the sidelink reference signals for positioning or to configure an appropriate common and/or dedicated resource pool.

In one or more example methods, such as in SL positioning scheme 2, where two sidelink devices, such as a first and a second WD, are out of the radio network node’s coverage, the information indicative of the first WD’s capability, such as the capability report, is transmitted from the first WD, such as the sidelink reference signal receiving WD, to the second WD, such as to the sidelink reference signal transmitting WD, via one or more of higher layer signaling and lower layer signaling.

This action S101 corresponds to action S201 disclosed in relation to the wireless device in Fig. 5.

In one or more example methods, the method comprises receiving S102, from a second WD, information indicative of a requested resource structure scheme to be used for transmitting reference signals for sidelink positioning to the first WD. This may be the case when the second WD is a sidelink reference signal transmitting WD and the node is a network node. In one or more example methods, the information indicative of the requested resource structure scheme may comprise an explicit indication of the requested resource structure scheme. In one or more example methods, the information indicative of the requested resource structure scheme may comprise an implicit indication of the requested resource structure scheme. The information indicative of the requested resource structure scheme, such as the implicit indication of the requested resource structure scheme, may comprise an identifier identifying the first WD. Based on the identifier identifying the first WD and the information indicative of the first WD’s capability to process one or more of the plurality of resource structure schemes, the node can determine the resource structure scheme to be used for transmission of sidelink reference signals for positioning to the first WD.

In one or more example methods, the method comprises determining S103 a resource structure scheme out of the plurality of resource structure schemes for transmitting sidelink reference signals for positioning to the first WD. In one or more example methods, the resource structure scheme is determined based on one or more of a resource pool type, a capability of the first WD, such as the sidelink reference signal receiving WD, to process one or more of the plurality of resource structure schemes, and a transmission type for transmitting sidelink reference signals for positioning. In one or more example methods, determining the sidelink reference signal resource structures within the resource pool is based on the resource pool type, such as whether the resource pool is a common resource pool or a dedicated resource pool. For example, the common resource pool may be restricted to be configured with only one type of multiplexing scheme or with both types of multiplexing scheme. For example, a resource pool dedicated for TDM, such as a resource pool comprising only TDM allocated resources, may be used for sidelink reference signal receiving WDs that are only capable of processing TDM-based sidelink reference signals for positioning. In this case, the resources for transmission of sidelink reference signals for positioning to respective WDs in this resource pool are not collocated in a same frequency band, such as are separated in time, to avoid interference.

In a resource pool dedicated to FDM, such as resource pool comprising only FDM allocated resources, resources for transmission of sidelink reference signals to respective sidelink reference signal receiving WDs may be allocated with respective comb structures having the same comb size and symbol index, but with different comb offsets. In a common resource pool on the other hand, there is no restriction for multiplexing and the resources for sidelink reference signals for positioning may be determined to be time-division multiplexed and/or frequency-division multiplexed in the same resource pool.

In one or more example methods, determining the sidelink reference signal resource structures within the resource pool is based on the transmission type. The transmission type may for example be indicative of whether the transmission is a unicast, groupcast, or a broadcast transmission. In one or more example methods, a default multiplexing scheme may be determined and/or provided which is supported by all sidelink reference signal receiving WDs. In this case, broadcasted transmissions by a sidelink reference signal for positioning transmitting WD is to be based on one type of multiplexing scheme (such as FDM or TDM). In one or more example methods, the default multiplexing scheme is applied in case the first WD does not report a capability and/or a preference.

In one or more example methods, the transmission type (such as periodic or aperiodic) may be indicative of whether a multiplexing scheme will be used over the other. For a periodic transmission the default multiplexing scheme may be determined to be used.

In one or more example methods, determining the sidelink reference signal resource structures within the resource pool or determining the multiplexing scheme is based on the capability of the first WD, such as of the sidelink reference signal receiving WD, to process one or more of the plurality of resource structure schemes. The sidelink reference signal resource structures within the resource pool may be determined so that the transmitted sidelink reference signals for positioning can be received, measured and/or processed by the receiving WD.

In one or more example methods, determining S103 comprises determining S103A the resource structure scheme based on the identifier identifying the first WD and the information indicative of the first WD’s capability to process one or more of the plurality of resource structure schemes.

The method 100 comprises transmitting S105, to the first WD of the plurality of WDs, a sidelink positioning resource configuration. The sidelink positioning resource configuration comprises information indicative of a plurality of resource structure schemes to be used for communication, such as transmission or reception, of sidelink reference signals for positioning. In one or more example methods, a plurality of resources associated with each of the resource structure schemes are provided in a respective subset of resources. The resources associated with each of the resource structure schemes can herein be seen as resources in which the resource structure schemes are applied.

In one or more example methods, the subset of resources associated with each of the resource structure schemes are comprised in, such as allocated to, one or more sidelink resource pool(s), such as in a same or in different sidelink resource pools. In one or more example methods, the subset of resources associated with each of the resource structure schemes are comprised in respective sidelink resource pools, as illustrated in Fig. 3A. A first subset of resources associated with a first resource structure scheme of the plurality of resource structure schemes may be comprised in, such as allocated to, a first sidelink resource pool, while a second subset of resources associated with a second resource structure scheme of the plurality of resource structure schemes may be comprised in, such as allocated to, a second sidelink resource pool different than the first resource pool. In one or more example methods, the subset of resources associated with each of the resource structure schemes are comprised in respective sidelink resources within a same, such as within a common, sidelink resource pool, as illustrated in Fig. 3B. In one or more example methods, the subset of resources associated with each of the resource structure schemes are comprised in a same, such as in a common sidelink resource within a same, such as within a common, sidelink resource pool, as illustrated in Fig. 3C. In one or more example methods, such as when the subset of resources associated with each of the resource structure schemes are comprised in a common sidelink resource pool, the subset of resources are separated by a guard period. The guard period may be a period in time, such as one or more OFDM symbols.

In one or more example methods, the resource structure schemes, such as at least one of the resource structure schemes, are/is preconfigured multiplexing scheme(s).

In one or more example methods, a first resource structure scheme of the plurality of resource structure schemes is a TDM scheme, such as a resource structure scheme having a Comb-1 structure.

In one or more example methods, at least a second resource structure scheme of the plurality of resource structure schemes is an FDM scheme, such as a resource structure scheme of the plurality of resource structure scheme having a Comb>1 structure, for example a Comb-4, Comb-6, Comb-8, Comb-10, or Comb-12 structure.

In one or more example methods, the sidelink positioning resource structure configuration is transmitted via one or more of higher layer signaling and lower layer signaling. The higher layer signaling may for example be Radio Resource Control (RRC) signaling. The lower layer signaling may be one or more of Downlink Control Information (DCI), Sidelink Control Information (SCI), and Sidelink Medium Access Control - Control Element (SL MAC CE). In one or more example methods, the sidelink positioning resource structure configuration transmitted via lower layer signaling can be configured to over-write a sidelink positioning resource structure configuration transmitted via higher layer signaling. In one or more example methods, one of the resource structure schemes can be defined as the default configuration for transmission of sidelink reference signals for positioning within a resource pool and may be configured by higher layer signaling. However, this default configuration may, in one or more example methods, be over-ruled by lower layer signaling.

In one or more example methods, the node is a network node, such as a radio network node or a positioning node, such as a location management function (LMF). The network node may transmit the sidelink positioning resource structure configuration to the first WD and a second WD, where the first WD is a sidelink reference signal receiving WD and the second WD is a sidelink reference signal transmitting WD. This may for example be the case when the first WD and/or the second WD are in coverage of the network node. This may be the case for sidelink positioning in Scheme 1 , in which the network node controls the configuration/allocation of resources. In one or more example methods, the node is a second WD configured to transmit sidelink reference signals for positioning, which can herein also be referred to as a sidelink reference signal transmitting WD. This may for example be the case when the first WD is out of coverage of the network node. This may be the case for sidelink positioning in Scheme 2, in which the configuration/allocation of resources may be controlled by the sidelink reference signal transmitting wireless device.

In one or more example methods, the first WD is a WD configured to receive sidelink reference signals for positioning, such as a sidelink reference signal receiving WD.

In one or more example methods, such as when the node is a sidelink reference signal transmitting WD, the method comprises transmitting S107, to the first WD, sidelink reference signals for positioning according to the sidelink positioning resource configuration, such as according to the resource structure scheme, such as a multiplexing scheme, indicated in the sidelink positioning resource configuration.

In one or more example methods, the method comprises receiving S109, from the first WD, a measurement report comprising information indicating that the first WD does not support the resource structure scheme of the sidelink reference signals transmission.

Fig. 5 shows a flow diagram of an example method 200, performed by a first WD in a communication network according to this disclosure, for configuring sidelink positioning resources for communication of sidelink reference signals for positioning between the first WD and a second WD. The first WD is the wireless device disclosed herein, such as wireless device 300 of Fig. 1 , and Fig. 7, such as a reference signal receiving wireless device 300B or a reference signal transmitting wireless device 300A.

In one or more example methods, the method comprises transmitting S201 , to the node, information indicative of the first WDs capability to process one or more of the plurality of resource structure schemes. The information indicative of the WD’s capability to process one or more of the plurality of resource structure schemes may be indicative of the WD’s capability on processing multiplexed resources for sidelink reference signals for positioning. The capability can be indicated in the form of a hard value, such as 1 for full capability and 0 for no capability. The WD may indicate its capability of processing time-division multiplexed sidelink reference signals for positioning and its capability of processing frequency-division multiplexed sidelink reference signals for positioning individually. In one or more examples, the capability of processing time-division multiplexed sidelink reference signals for positioning and/or frequencydivision multiplexed sidelink reference signals for positioning in a table. The first WD may transmit the information indicative of the first WDs capability to process one or more of the plurality of resource structure schemes in response to receiving a request for a capability report from the node. In one or more example methods, the information indicative of the WDs capability to process one or more of the plurality of resource structure schemes may be indicative of the WD’s capability and/or preference on using either a common resource pool or a dedicated TDM/FDM resource pools to the node, such as to the radio network node and/or to a sidelink reference signal transmitting WD. In one or more example methods, the information indicative of the WD’s capability, such as the capability report, is transmitted directly from the WD, such as from the reference signal receiving WD and/or the reference signal transmitting WD, to a radio network node, such as the radio network node serving the WD, via higher layer signaling, such as RRC signaling. In one or more example methods, such as when the WD is the sidelink reference signal receiving WD, the information indicative of the WD’s capability, such as the capability report, is transmitted indirectly via a sidelink reference signal transmitting WD. In other words, in one or more example methods, the sidelink reference signal receiving WD conveys the capability report to sidelink reference signal transmitting WD first and the sidelink reference signal transmitting WD forwards it to the radio network node, such as a gNB or to the network node, such as an LMF.

In one or more example methods, such as for SL positioning scheme 1 , the WD, such as the sidelink reference signal receiving WD, indicates its capability in processing time division multiplexed (TDMed) and/or frequency division multiplexed (FDMed) reference signals for sidelink positioning to the node, such as the radio network node, to enable the radio network node to dynamically adjust the multiplexing mode for the sidelink reference signals for positioning or to configure an appropriate common and/or dedicated resource pool.

In one or more example methods, such as for SL positioning scheme 2, where two sidelink devices, such as a first WD and a second WD, are out of the radio network node’s coverage, the information indicative of the first WD’s capability, such as the capability report, is transmitted from the first WD, such as the sidelink reference signal receiving WD, to the second WD, such as to the sidelink reference signal transmitting WD, via one or more of higher layer signaling and lower layer signaling. This action S201 corresponds to action S101 disclosed in relation to the node in Fig. 4.

In one or more example methods, the method comprises transmitting S202, to the node, information indicative of a requested resource structure scheme to be used for transmitting reference signals for sidelink positioning to a reference signal receiving WD. This may be the case when the second WD is a sidelink reference signal transmitting WD and the node is a network node. In one or more example methods, the information indicative of the requested resource structure scheme may comprise an explicit indication of the requested resource structure scheme. In one or more example methods, the information indicative of the requested resource structure scheme may comprise an implicit indication of the requested resource structure scheme. The information indicative of the requested resource structure may in one or more example methods comprise an identifier identifying the reference signal receiving WD. This action S202 corresponds to action S102 disclosed in relation to the node in Fig. 4.

The method 200 comprises receiving S203, from a node, a sidelink positioning resource configuration. The sidelink positioning resource configuration comprises information indicative of a plurality of resource structure schemes to be used for communication of sidelink reference signals for positioning. In one or more example methods, a plurality of resources associated with each of the resource structure schemes are provided in a respective subset of resources.

In one or more example methods, the respective subsets of resources associated with each of the resource allocation are comprised in, such as allocated to, one or more sidelink resource pool(s). In one or more example methods, the subset of resources associated with each of the resource structure schemes are comprised in respective sidelink resource pools, as illustrated in Fig. 3A. A first subset of resources associated with a first resource structure scheme of the plurality of resource structure schemes may be comprised in, such as allocated to, a first sidelink resource pool, while a second subset of resources associated with a second resource structure scheme of the plurality of resource structure schemes may be comprised in, such as allocated to, a second sidelink resource pool different than the first resource pool. In one or more example methods, the subset of resources associated with each of the resource structure schemes are comprised in respective sidelink resources within a same, such as within a common, sidelink resource pool, as illustrated in Fig. 3B. In one or more example methods, the subset of resources associated with each of the resource structure schemes are comprised in a same, such as in a common sidelink resource within a same, such as within a common, sidelink resource pool, as illustrated in Fig. 3C. In one or more example methods, each subset of resources are separated by a guard period.

In one or more example methods, the resource structure schemes, such as at least one of the resource structure schemes, are/is preconfigured. The preconfigured resource structure schemes may be preconfigured multiplexing scheme(s). The preconfigured resource structure schemes may be received via higher layer signaling, such as RRC signaling, from a radio network node.

In one or more example methods, the sidelink positioning resource structure configuration is received via one or more of higher layer signaling and lower layer signaling. The higher layer signaling may for example be RRC signaling. The lower layer signaling may be one or more of DCI, SCI, and SL MAC CE. The RRC and the DCI may be received from a network node, such as from a radio network node. The SCI and the SL MAC CE may be received from a second WD in sidelink. In one or more example methods, the sidelink positioning resource structure configuration received via lower layer signaling can be configured to over-write a sidelink positioning resource structure configuration transmitted via higher layer signaling.

In one or more example methods, the WD is a WD configured to receive sidelink reference signal for positioning.

In one or more example methods, the WD is a WD configured to transmit sidelink reference signal for positioning.

In one or more example methods, such as when the WD is a sidelink reference signal receiving WD, the node may be a second WD configured to transmit sidelink reference signals for positioning. This may be the case for sidelink positioning in Scheme 2, in which the configuration/allocation of resources may be controlled by the wireless devices autonomously from the network.

In one or more example methods, the node is a network node, such as a radio network node and/or an LMF. This may be the case for sidelink positioning in Scheme 1 , in which the network node controls the configuration/allocation of resources.

In one or more example methods, such as when the WD is a sidelink reference signal receiving WD, the method comprises receiving S207, from a reference signal transmitting WD, sidelink reference signals for positioning according to the sidelink positioning resource configuration.

In one or more example methods, such as when the WD is a sidelink reference signal receiving WD, the method comprises transmitting S209, to the node, such as to the reference signal transmitting WD or the network node, a measurement report comprising information indicating that the WD does not support the resource structure scheme of the sidelink reference signals transmission.

Fig. 6 shows a block diagram of an example node 800 according to the disclosure. The node 800 comprises memory circuitry 801 , processor circuitry 802, and an interface 803, such as a wired or wireless interface. The node 800 may be configured to perform any of the methods disclosed in Fig. 4. In other words, the node 800 may be configured for configuring sidelink positioning resources for communication of sidelink reference signals for positioning between a plurality of WDs. The node 800 may be a radio network node, such as the radio network node 400 disclosed in Fig. 1 , a core network node, such as the core network node 600 of Fig. 1 , such as an LMF, or a sidelink reference signal transmitting Wd, such as the WD 300A of Fig. 1. The node 800 is configured to communicate with a wireless device, such as the wireless device 300 disclosed herein, using a wireless communication system.

The interface 803 is configured for wireless communications via a wireless communication system, such as a 3GPP system, such as a 3GPP system supporting one or more of: New Radio, NR, Long Term Evolution, LTE, Narrow-band loT, NB-loT, and Long Term Evolution - enhanced Machine Type Communication, LTE-M, and 3GPP system operated in licensed bands or unlicensed bands.

The node 800 is configured to transmit, for example via the interface 803, to a first WD of the plurality of WDs, a sidelink positioning resource configuration, wherein the sidelink positioning resource configuration comprises information indicative of a plurality of resource structure schemes to be used for communication of sidelink reference signals for positioning.

Processor circuitry 802 is optionally configured to perform any of the operations disclosed in Fig. 4 (such as any one or more of S101 , S102, S103, S103A, S105, S105A, S107, S109). The operations of the node 800 may be embodied in the form of executable logic routines (for example, lines of code, software programs, etc.) that are stored on a non-transitory computer readable medium (for example, memory circuitry 801 ) and are executed by processor circuitry 802).

Furthermore, the operations of the node 800 may be considered a method that the node 800 is configured to carry out. Also, while the described functions and operations may be implemented in software, such functionality may also be carried out via dedicated hardware or firmware, or some combination of hardware, firmware and/or software.

Memory circuitry 801 may be one or more of a buffer, a flash memory, a hard drive, a removable media, a volatile memory, a non-volatile memory, a random access memory (RAM), or other suitable device. In a typical arrangement, memory circuitry 801 may include a nonvolatile memory for long term data storage and a volatile memory that functions as system memory for processor circuitry 802. Memory circuitry 801 may exchange data with processor circuitry 802 over a data bus. Control lines and an address bus between memory circuitry 801 and processor circuitry 802 also may be present (not shown in Fig. 6). Memory circuitry 801 is considered a non-transitory computer readable medium.

Memory circuitry 801 may be configured to store information, such as one or more of a resource structure schemes, and information indicative of the first WD’s capability to process one or more of the plurality of resource structure schemes, in a part of the memory.

Fig. 7 shows a block diagram of an example wireless device 300 according to the disclosure. The wireless device 300 comprises memory circuitry 301 , processor circuitry 302, and a wireless interface 303. The wireless device 300 may be configured to perform any of the methods disclosed in Fig. 5. In other words, the wireless device 300 may be configured configuring sidelink positioning resources for communication of sidelink reference signals for positioning between a first WD and a second WD. The wireless device 300 is configured to communicate with a node, such as the node 800 disclosed herein, using a wireless communication system. The wireless device 300 may be a sidelink reference signal receiving wireless device, such as the sidelink reference signal receiving wireless device 300B of Fig. 1 , or a sidelink reference signal transmitting wireless device, such as the sidelink reference signal transmitting wireless device 300A of Fig. 1 .

The wireless device 300 is configured to receive, such as via the wireless interface 303, from the node, a sidelink positioning resource configuration, wherein the sidelink positioning resource configuration comprises information indicative of a plurality of resource structure schemes to be used for communication of sidelink reference signals for positioning.

The wireless interface 303 is configured for wireless communications via a wireless communication system, such as a 3GPP system, such as a 3GPP system supporting one or more of: New Radio, NR, Long Term Evolution, LTE, Narrow-band loT, NB-loT, and Long Term Evolution - enhanced Machine Type Communication, LTE-M, and 3GPP system operated in licensed bands or unlicensed bands.

The wireless device 300 is optionally configured to perform any of the operations disclosed in Fig. 5 (such as any one or more of S201 , S202, S203, S207). The operations of the wireless device 300 may be embodied in the form of executable logic routines (for example, lines of code, software programs, etc.) that are stored on a non-transitory computer readable medium (for example, memory circuitry 301 ) and are executed by processor circuitry 302).

Furthermore, the operations of the wireless device 300 may be considered a method that the wireless device 300 is configured to carry out. Also, while the described functions and operations may be implemented in software, such functionality may also be carried out via dedicated hardware or firmware, or some combination of hardware, firmware and/or software.

Memory circuitry 301 may be one or more of a buffer, a flash memory, a hard drive, a removable media, a volatile memory, a non-volatile memory, a random access memory (RAM), or other suitable device. In a typical arrangement, memory circuitry 301 may include a nonvolatile memory for long term data storage and a volatile memory that functions as system memory for processor circuitry 302. Memory circuitry 301 may exchange data with processor circuitry 302 over a data bus. Control lines and an address bus between memory circuitry 301 and processor circuitry 302 also may be present (not shown in Fig. 7). Memory circuitry 301 is considered a non-transitory computer readable medium.

Memory circuitry 301 may be configured to store information, such as one or more of a resource structure schemes, in a part of the memory.

Examples of methods and products (node and wireless device) according to the disclosure are set out in the following items: Item 1 . A method performed by a node in a communication network, for configuring sidelink positioning resources for communication of sidelink reference signals for positioning between a plurality of WDs, the method comprising: transmitting (S103), to a first WD of the plurality of WDs, a sidelink positioning resource configuration, wherein the sidelink positioning resource configuration comprises information indicative of a plurality of resource structure schemes to be used for communication of sidelink reference signals for positioning.

Item 2. The method according to Item 1 , wherein a plurality of resources associated with each of the resource structure schemes are provided in a respective subset of resources.

Item 3. The method according to Item 2, wherein the subsets of resources associated with each of the resource structure schemes is comprised in one or more sidelink resource pool(s).

Item 4. The method according to Item 2 or 3, wherein each subset of resources are separated by a guard period.

Item 5. The method according to any one of the previous Items, wherein the resource structure schemes are preconfigured multiplexing schemes.

Item 6. The method according to any one of the previous Items, wherein a first resource structure scheme of the plurality of resource structure schemes is a time division multiplexing, TDM, scheme, and at least a second resource structure scheme of the plurality of resource structure schemes is a frequency division multiplexing, FDM, scheme.

Item 7. The method according to any one of the previous Items, wherein a first resource structure scheme of the plurality of resource allocation schemes has a Comb-1 structure, and at least a second resource structure scheme of the plurality of resource allocation schemes has a Comb>1 structure.

Item 8. The method according to any one of the previous Items, wherein the method comprises: receiving (S101 ), from the first WD, information indicative of the first WD’s capability to process one or more of the plurality of resource structure schemes. Item 9. The method according to any one of the previous Items, wherein the method comprises: determining (S105) a resource structure scheme out of the plurality of resource structure schemes for transmitting sidelink reference signals for positioning to the first WD.

Item 10. The method according to Item 9, wherein the resource structure scheme is determined based on one or more of: a resource pool type, a capability of the first WD to process one or more of the plurality of resource structure schemes, and a transmission type for transmitting sidelink reference signals for positioning.

Item 11. The method according to any one of the previous Items, wherein the sidelink positioning resource structure configuration is transmitted via one or more of higher layer signaling and lower layer signaling.

Item 12. The method according to Item 11 , wherein the sidelink positioning resource structure configuration transmitted via lower layer signaling can be configured to over-write a sidelink positioning resource structure configuration transmitted via higher layer signaling.

Item 13. The method according to any one of the previous Items, wherein the node is a network node.

Item 14. The method according to any of the previous Items, wherein the node is a second WD configured to transmit sidelink reference signals for positioning.

Item 15. The method according to any one of the previous Items, wherein the first WD is a WD configured to receive sidelink reference signals for positioning.

Item 16. The method according to Item 13, wherein the method comprises: receiving (S102), from a second WD, information indicative of a requested resource structure scheme to be used for transmitting reference signals for sidelink positioning to the first WD.

Item 17. The method according to Item 16, wherein the information indicative of the requested resource structure comprises an identifier identifying the first WD.

Item 18. The method according to Items 8, 9 and 17, wherein determining (S105) comprises determining (S105A) the resource structure scheme based on the identifier identifying the first WD and the information indicative of the first WD’s capability to process one or more of the plurality of resource structure schemes.

Item 19. The method according to Item 14, wherein the method comprises: transmitting (S107), to the first WD, sidelink reference signals for positioning according to the sidelink positioning resource configuration.

Item 20. A method performed by a first WD in a communication network, for configuring sidelink positioning resources for communication of sidelink reference signals for positioning between a first WD and a second WD, the method comprising: receiving (S203), from a node, a sidelink positioning resource configuration, wherein the sidelink positioning resource configuration comprises information indicative of a plurality of resource structure schemes to be used for communication of sidelink reference signals for positioning.

Item 21. The method according to Item 20, wherein a plurality of resources associated with each of the resource structure schemes are provided in a respective subset of resources.

Item 22. The method according to Item 21 , wherein the respective subsets of resources associated with each of the resource allocation are comprised in one or more sidelink resource pool(s).

Item 23. The method according to Item 21 or 22, wherein each subset of resources are separated by a guard period.

Item 24. The method according to any one of the Items 20 to 23, wherein the resource structure schemes are preconfigured multiplexing schemes.

Item 25. The method according to any one of the Items 20 to 24, wherein a first of the plurality of resource structure schemes is a time division multiplexing, TDM, scheme, and at least a second of the plurality of resource structure schemes is a frequency division multiplexing, FDM, scheme.

Item 26. The method according to any one of the Items 20 to 25, wherein a first resource structure scheme of the plurality of resource structure schemes has a Comb-1 structure, and at least a second resource structure scheme of the plurality of resource structure schemes has a Comb>1 structure.

Item 27. The method according to any one of the Items 20 to 26, wherein the method comprises: transmitting (S201 ), to the node, information indicative of the first WDs capability to process one or more of the plurality of resource structure schemes. Item 28. The method according to any one of the Items 20 to 27, wherein the sidelink positioning resource configuration is received via one or more of higher layer signaling and lower layer signaling.

Item 29. The method according to any of the Items 20 to 28, wherein the node is a second WD configured to transmit sidelink reference signals for positioning.

Item 30. The method according to any one of the Items 20 to 29, wherein the node is a network node.

Item 31. The method according to any one of the Items 20 to 30, wherein the first WD is a WD configured to receive sidelink reference signal for positioning.

Item 32. The method according to any one of the Items 20 to 30, wherein the first WD is a WD configured to transmit sidelink reference signal for positioning.

Item 33. The method according to Item 31 , wherein the method comprises: receiving (S207), from a reference signal transmitting WD, sidelink reference signals for positioning according to the sidelink positioning resource configuration.

Item 34. The method according to Item 32, wherein the method comprises: transmitting (S202), to the node, information indicative of a requested resource structure scheme to be used for transmitting reference signals for sidelink positioning to a reference signal receiving WD.

Item 35. The method according to Item 34, wherein the information indicative of the requested resource structure comprises an identifier identifying the reference signal receiving WD.

Item 36. A node comprising memory circuitry, processor circuitry, and a wireless interface, wherein the node is configured to perform any of the methods according to any of Items 1 to 19.

Item 37. A wireless device comprising memory circuitry, processor circuitry, and a wireless interface, wherein the wireless device is configured to perform any of the methods according to any of Items 20-35.

The use of the terms “first”, “second”, “third” and “fourth”, “primary”, “secondary”, “tertiary” etc. does not imply any particular order, but are included to identify individual elements. Moreover, the use of the terms “first”, “second”, “third” and “fourth”, “primary”, “secondary”, “tertiary” etc. does not denote any order or importance, but rather the terms “first”, “second”, “third” and “fourth”, “primary”, “secondary”, “tertiary” etc. are used to distinguish one element from another. Note that the words “first”, “second”, “third” and “fourth”, “primary”, “secondary”, “tertiary” etc. are used here and elsewhere for labelling purposes only and are not intended to denote any specific spatial or temporal ordering. Furthermore, the labelling of a first element does not imply the presence of a second element and vice versa.

It may be appreciated that Figures 1 to 7 comprise some circuitries or operations which are illustrated with a solid line and some circuitries, components, features, or operations which are illustrated with a dashed line. Circuitries or operations which are comprised in a solid line are circuitries, components, features or operations which are comprised in the broadest example. Circuitries, components, features, or operations which are comprised in a dashed line are examples which may be comprised in, or a part of, or are further circuitries, components, features, or operations which may be taken in addition to circuitries, components, features, or operations of the solid line examples. It should be appreciated that these operations need not be performed in order presented. Furthermore, it should be appreciated that not all of the operations need to be performed. The example operations may be performed in any order and in any combination. It should be appreciated that these operations need not be performed in order presented. Circuitries, components, features, or operations which are comprised in a dashed line may be considered optional.

Other operations that are not described herein can be incorporated in the example operations. For example, one or more additional operations can be performed before, after, simultaneously, or between any of the described operations.

Certain features discussed above as separate implementations can also be implemented in combination as a single implementation. Conversely, features described as a single implementation can also be implemented in multiple implementations separately or in any suitable sub-combination. Moreover, although features may be described above as acting in certain combinations, one or more features from a claimed combination can, in some cases, be excised from the combination, and the combination may be claimed as any sub-combination or variation of any sub-combination

It is to be noted that the word "comprising" does not necessarily exclude the presence of other elements or steps than those listed.

It is to be noted that the words "a" or "an" preceding an element do not exclude the presence of a plurality of such elements.

It should further be noted that any reference signs do not limit the scope of the claims, that the examples may be implemented at least in part by means of both hardware and software, and that several "means", "units" or "devices" may be represented by the same item of hardware. The various example methods, devices, nodes and systems described herein are described in the general context of method steps or processes, which may be implemented in one aspect by a computer program product, embodied in a computer-readable medium, including computer-executable instructions, such as program code, executed by computers in networked environments. A computer-readable medium may include removable and nonremovable storage devices including, but not limited to, Read Only Memory (ROM), Random Access Memory (RAM), compact discs (CDs), digital versatile discs (DVD), etc. Generally, program circuitries may include routines, programs, objects, components, data structures, etc. that perform specified tasks or implement specific abstract data types. Computer-executable instructions, associated data structures, and program circuitries represent examples of program code for executing steps of the methods disclosed herein. The particular sequence of such executable instructions or associated data structures represents examples of corresponding acts for implementing the functions described in such steps or processes.

Although features have been shown and described, it will be understood that they are not intended to limit the claimed disclosure, and it will be made obvious to those skilled in the art that various changes and modifications may be made without departing from the scope of the claimed disclosure. The specification and drawings are, accordingly, to be regarded in an illustrative rather than restrictive sense. The claimed disclosure is intended to cover all alternatives, modifications, and equivalents.

Claims

1 . A method performed by a node in a communication network, for configuring sidelink positioning resources for communication of sidelink reference signals for positioning between a plurality of WDs, the method comprising: transmitting (S103), to a first WD of the plurality of WDs, a sidelink positioning resource configuration, wherein the sidelink positioning resource configuration comprises information indicative of a plurality of resource structure schemes to be used for communication of sidelink reference signals for positioning.

2. The method according to claim 1 , wherein a plurality of resources associated with each of the resource structure schemes are provided in a respective subset of resources.

3. The method according to claim 2, wherein the subsets of resources associated with each of the resource structure schemes is comprised in one or more sidelink resource pool(s).

4. The method according to claim 2 or 3, wherein each subset of resources are separated by a guard period.

5. The method according to any one of the previous claims, wherein the resource structure schemes are preconfigured multiplexing schemes.

6. The method according to any one of the previous claims, wherein a first resource structure scheme of the plurality of resource structure schemes is a time division multiplexing, TDM, scheme, and at least a second resource structure scheme of the plurality of resource structure schemes is a frequency division multiplexing, FDM, scheme.

7. The method according to any one of the previous claims, wherein a first resource structure scheme of the plurality of resource allocation schemes has a Comb-1 structure, and at least a second resource structure scheme of the plurality of resource allocation schemes has a Comb>1 structure.

8. The method according to any one of the previous claims, wherein the method comprises: receiving (S101 ), from the first WD, information indicative of the first WD’s capability to process one or more of the plurality of resource structure schemes.

9. The method according to any one of the previous claims, wherein the method comprises: determining (S105) a resource structure scheme out of the plurality of resource structure schemes for transmitting sidelink reference signals for positioning to the first WD.

10. The method according to claim 9, wherein the resource structure scheme is determined based on one or more of: a resource pool type, a capability of the first WD to process one or more of the plurality of resource structure schemes, and a transmission type for transmitting sidelink reference signals for positioning.

11. The method according to any one of the previous claims, wherein the sidelink positioning resource structure configuration is transmitted via one or more of higher layer signaling and lower layer signaling.

12. The method according to claim 11 , wherein the sidelink positioning resource structure configuration transmitted via lower layer signaling can be configured to over-write a sidelink positioning resource structure configuration transmitted via higher layer signaling.

13. The method according to any one of the previous claims, wherein the node is a network node.

14. The method according to any of the previous claims, wherein the node is a second WD configured to transmit sidelink reference signals for positioning.

15. The method according to any one of the previous claims, wherein the first WD is a WD configured to receive sidelink reference signals for positioning.

16. The method according to claim 13, wherein the method comprises: receiving (S102), from a second WD, information indicative of a requested resource structure scheme to be used for transmitting reference signals for sidelink positioning to the first WD.

17. The method according to claim 16, wherein the information indicative of the requested resource structure comprises an identifier identifying the first WD.

18. The method according to claims 8, 9 and 17, wherein determining (S105) comprises determining (S105A) the resource structure scheme based on the identifier identifying the first WD and the information indicative of the first WD’s capability to process one or more of the plurality of resource structure schemes.

19. The method according to claim 14, wherein the method comprises: transmitting (S107), to the first WD, sidelink reference signals for positioning according to the sidelink positioning resource configuration.

20. A method performed by a first WD in a communication network, for configuring sidelink positioning resources for communication of sidelink reference signals for positioning between the first WD and a second WD, the method comprising: receiving (S203), from a node, a sidelink positioning resource configuration, wherein the sidelink positioning resource configuration comprises information indicative of a plurality of resource structure schemes to be used for communication of sidelink reference signals for positioning.

21. The method according to claim 20, wherein a plurality of resources associated with each of the resource structure schemes are provided in a respective subset of resources.

22. The method according to claim 21 , wherein the respective subsets of resources associated with each of the resource allocation are comprised in one or more sidelink resource pool(s).

23. The method according to claim 21 or 22, wherein each subset of resources are separated by a guard period.

24. The method according to any one of the claims 20 to 23, wherein the resource structure schemes are preconfigured multiplexing schemes.

25. The method according to any one of the claims 20 to 24, wherein a first of the plurality of resource structure schemes is a time division multiplexing, TDM, scheme, and at least a second of the plurality of resource structure schemes is a frequency division multiplexing, FDM, scheme.

26. The method according to any one of the claims 20 to 25, wherein a first resource structure scheme of the plurality of resource structure schemes has a Comb-1 structure, and at least a second resource structure scheme of the plurality of resource structure schemes has a Comb>1 structure.

27. The method according to any one of the claims 20 to 26, wherein the method comprises: transmitting (S201 ), to the node, information indicative of the first WDs capability to process one or more of the plurality of resource structure schemes.

28. The method according to any one of the claims 20 to 27, wherein the sidelink positioning resource configuration is received via one or more of higher layer signaling and lower layer signaling.

29. The method according to any of the claims 20 to 28, wherein the node is a second WD configured to transmit sidelink reference signals for positioning.

30. The method according to any one of the claims 20 to 29, wherein the node is a network node.

31. The method according to any one of the claims 20 to 30, wherein the first WD is a WD configured to receive sidelink reference signal for positioning.

32. The method according to any one of the claims 20 to 30, wherein the first WD is a WD configured to transmit sidelink reference signal for positioning.

33. The method according to claim 31 , wherein the method comprises: receiving (S207), from a reference signal transmitting WD, sidelink reference signals for positioning according to the sidelink positioning resource configuration.

34. The method according to claim 32, wherein the method comprises: transmitting (S202), to the node, information indicative of a requested resource structure scheme to be used for transmitting reference signals for sidelink positioning to a reference signal receiving WD.

35. The method according to claim 34, wherein the information indicative of the requested resource structure comprises an identifier identifying the reference signal receiving WD.

36. A node comprising memory circuitry, processor circuitry, and a wireless interface, wherein the node is configured to perform any of the methods according to any of claims 1 to 19.

37. A wireless device comprising memory circuitry, processor circuitry, and a wireless interface, wherein the wireless device is configured to perform any of the methods according to any of claims 20-35.