Congestion control and resource allocation for sidelink positioning reference signal transmissions

Abstract

The techniques described in this paper include solutions for allocating sidelink positioning reference signals (SL-PRS). In some aspects, various aspects of SL-PRS congestion control, reserving resources for another UE, and inter-UE coordination for SL-PRS resource selection using auxiliary information from the auxiliary UE are illustrated to improve SL-PRS communication.

Description

Citation of relevant applications

[0001] This application claims the benefit of U.S. Provisional Application No. 63 / 502,113, filed May 14, 2023, the contents of which are incorporated herein by reference in their entirety. Technical Field

[0002] This disclosure relates to wireless communication networks, including techniques for allocating sidelink resources within the wireless communication network. Background Technology

[0003] Wireless communication networks may include user equipment (UEs), base stations, and / or other types of wireless devices capable of communicating with each other. During operation, UEs may communicate with each other via sidelink signaling. Summary of the Invention

[0004] This disclosure relates to resource allocation techniques for SL-PRS, including resource allocation, channel congestion control, inter-UE coordination, and other aspects of SL-PRS communication techniques. Attached Figure Description

[0005] This disclosure will be readily understood and implemented through the detailed description and accompanying drawings. The same reference numerals may designate the same features and structural elements. The drawings and corresponding descriptions are provided as non-limiting examples of aspects, embodiments, etc., of this disclosure, and references to “a” or “an” aspect, embodiment, etc., may not necessarily refer to the same aspect, embodiment, etc., and may mean at least one, one, or more, etc.

[0006] Figure 1 An overview diagram illustrating a positioning algorithm involving the transmission / reception of side-link positioning reference signals (SL-PRS) between user equipment (UEs) is shown, according to some aspects of this disclosure.

[0007] Figure 2 Signaling diagrams for Scheme 1 SL-PRS communication are illustrated according to some aspects of this disclosure.

[0008] Figure 3 A block diagram illustrating SL-PRS resource allocation is shown, based on some aspects of this disclosure.

[0009] Figure 4 Scheme 2 signaling procedures involving congestion control for sending / receiving SL-PRS between UEs are illustrated according to some aspects of this disclosure.

[0010] Figure 5 The following is an example of a logical flow for channel congestion in SL-PRS, based on some aspects of this disclosure.

[0011] Figure 6 A diagram illustrating time-frequency resources for SL communication and SL-PRS according to some aspects of this disclosure is provided, showing examples of the definitions of SL-PRS CR and SL-PRS CR limits.

[0012] Figure 7 Example graphs illustrating congestion control processing time according to some aspects of this disclosure are provided.

[0013] Figure 8 A block diagram illustrating some examples of SL-PRS resource allocation according to some aspects of this disclosure is provided.

[0014] Figure 9 The following are examples of signaling between multiple UEs, including for determining the reserved SL-PRS resources for a target UE, according to some aspects of this disclosure.

[0015] Figure 10 The following is an example of signaling according to some aspects of this disclosure, including for determining and indicating the time window of SL-PRS resources for a target UE.

[0016] Figure 11 The following is an example of signaling between multiple Tx UEs according to some aspects of this disclosure, including receiving and using inter-UE coordination information from an auxiliary UE to allocate resources for transmitting SL-PRS.

[0017] Figure 12 Examples of active assistance using IUC scheme 1 and passive assistance using IUC scheme 2 are illustrated according to some aspects of this disclosure.

[0018] Figure 13 This invention illustrates a process flow for a UE to communicate SL-PRS in the presence of congestion control, based on some aspects of this disclosure.

[0019] Figure 14 The following illustrates a logical flow for a UE to communicate SL-PRS with coordinated resource reservations, based on some aspects of this disclosure.

[0020] Figure 15 This illustrates a process flow for a UE to communicate SL-PRS when it has inter-UE coordination information, according to some aspects of this disclosure.

[0021] Figure 16 This is a block diagram illustrating an apparatus that can be used to perform SL-PRS resource allocation according to some aspects of this disclosure.

[0022] Figure 17 This is a block diagram illustrating a baseband circuit that can be used to perform SL-PRS resource allocation according to some aspects of this disclosure. Detailed Implementation

[0023] The following detailed description refers to the accompanying drawings. The same reference numerals in different drawings may identify the same or similar features, elements, operations, etc. Additionally, this disclosure is not limited to the following description, as other specific embodiments and structural or logical changes may be made without departing from the scope of this disclosure.

[0024] The wireless communication network may include user equipment (UE) capable of wirelessly communicating with base stations and other network nodes and also capable of UE-to-UE direct communication using sidelink signaling. For UE-to-UE sidelink communication, resource allocation can be performed using either Scheme 1 or Scheme 2. In Scheme 1, the network (e.g., a base station) allocates resources and communicates the resource allocation to the UE via Uu operation, and the UE uses the allocated resources to transmit / receive sidelink signals. In Scheme 2, the transmitting UE participating in sidelink communication can autonomously allocate resources and use the allocated resources to transmit data to one or more other UEs. Sidelink resources can be determined based on a sensing and selection process assisted by resource reservation announcements from other UEs. Resources can be selected and / or reserved from a sidelink resource pool that can be shared by multiple sidelink UEs.

[0025] During sidelink operation, information relating to the location / position of other UEs (e.g., referred to as the anchor UE) can be used to determine the location / position of another UE (referred to as the target UE). For example, in applications such as vehicle-to-everything (V2X), a UE (e.g., the first vehicle) can use a sidelink positioning reference signal (SL-PRS) relating to other UEs (e.g., other vehicles or fixed infrastructure) to determine its relative location or geographic location and perform actions accordingly. With the increasing demand for sidelink positioning, the challenges of adequate and efficient SL-PRS communication involve various aspects of congestion control, resource allocation, and inter-UE coordination (IUC). Transmitting SL-PRS in busy channels without proper congestion control or IUC can cause data interference and collisions. Inappropriate resource reservation or allocation can lead to resource waste or low transmission success rates. Therefore, part of the ongoing optimization of sidelinks in wireless networks is to implement and improve the transmission of SL-PRS between UEs to facilitate the determination of UE location data.

[0026] In view of the foregoing, this disclosure relates to resource allocation techniques for SL-PRS, including resource allocation, channel congestion control, inter-UE coordination, and other aspects of SL-PRS communication techniques. In some aspects, resources for SL-PRS communication are selected from one or more traditional sidelink resource pools or dedicated SL-PRS resource pools. A dedicated SL-PRS resource pool may be associated with one or more traditional sidelink resource pools. Resources for SL-PRS can be allocated in sub-channels, which include resource block (RB) groups in the frequency domain. Resources for SL-PRS can also be allocated in sub-time slots in the time domain, but the resource pool for SL-PRS can be defined by time slots. Using sub-time slots improves the flexibility and efficiency of SL-PRS resource allocation. In some other aspects, congestion handling is performed based on (pre)congestion control constraints, making resources allocable to adapt to transmission priorities and reduce interference. SL-PRS congestion handling is performed. Parameters for determining SL-PRS congestion are defined, and these parameters can be modified during congestion handling to reduce SL-PRS transmissions and thus improve congestion management. In some additional aspects, the serving UE can reserve SL-PRS resources for transmission by another UE. In some further aspects, the auxiliary UE can provide the target UE with resource reservation information from a third-party UE, thereby enhancing resource allocation for SL-PRS transmissions for the target UE using information not directly available to the target UE. Therefore, sidelink positioning utilizing SL-PRS is specified and improved by defining resource pools, allocating resources, controlling congestion, and coordinating resource reservations and selections among different UEs. Other aspects and details of this disclosure are further described below with reference to the accompanying drawings.

[0027] Figure 1 This is an overview diagram illustrating, according to some aspects of this disclosure, a positioning algorithm relating to the transmission / reception of sidelink positioning reference signals (SL-PRS) between user equipment (UEs). According to some aspects described in this invention, multiple UEs such as UE101-1, 101-2, 101-3, 101-4, 101-5, 101-6 (hereinafter also referred to as UE 101) are configured to perform sidelink data communication and transmit / receive SL-PRS using relevant methods and operations.

[0028] UE 101-1 is shown as a transmitting UE having sidelink data to send to receiving UEs such as UE 101-2. In some aspects, UE 101-1 transmits SL-PRS to UE 101-2. UE 101-2 then measures the SL-PRS. Based on the SL-PRS measurement, UE 101-2 can obtain some location data related to the location of UE 101-1 relative to UE 101-2. In the case of resource allocation mode 2, transmitting UE 101-1 autonomously determines at 106 the resources to be used for transmitting the SL-PRS based on a sensing and resource selection process. The sensing and resource selection process considers resource reservations 102 received from other UEs 101-2, 101-3, 101-4, etc., during the sensing window. Resource reservations 102 can be broadcast by other UEs 101-2, 101-3, 101-4 as part of the first phase SCI transmitted on the Physical Sidelink Control Channel (PSCCH). Resources can be reserved and / or selected from one or more shared resource pools used for sidelink communication or one or more dedicated resource pools dedicated to SL-PRS. Resource pools can be shared by multiple UEs 101.

[0029] As shown in the first overview point at 112 and discussed in more detail later, some aspects of this disclosure relate to SL-PRS resource allocation, including, for example, defining minimum resource allocation in the time and frequency domains and how to define and obtain various SL-PRS parameters. As shown in the second overview point at 114 and discussed in more detail later, some additional aspects of this disclosure relate to SL-PRS congestion control. Various aspects of congestion control mechanisms for SL-PRS resource allocation are specified, such as the definition and determination of SL-PRSCR and SL-PRS CBR, and the specification of SL-SPR parameters that can be modified to reduce congestion. As shown in the third overview point at 116 and discussed in more detail later, some additional aspects of this disclosure relate to IUC coordination for SL-PRS. It is possible to support the following scenario: UE 101-1 acts as a reserved UE to select and reserve SL-PRS resources at action 118 for transmission by another UE 101-3 acting as the target UE. Additionally, in some scenarios, the hidden UE 101-6 is located outside the range of scheduled UEs such as reserved UE 101-1. The SL-PRS resource reservation 108 of the hidden UE 101-6 cannot be directly sent to the reserved UE 101-1 for consideration during SL-PRS scheduling, which may lead to data conflicts or interference. In some aspects, auxiliary UEs such as UE 101-2 or UE 101-3 can receive the SL-PRS resource reservation 108 and relay or process it, thereby sending SL-PRS IUC information 120 to UE 101-1. Therefore, the resource allocation of UE 101-1 is enhanced by utilizing the SL-PRS IUC information 120.

[0030] Base station 111 of the radio access network (RAN 110) can provide resource allocation when participating in Scheme 1 communication and also provide configuration information for SL-PRS to one or more UEs 101 when connected. Furthermore, UEs outside the coverage area (e.g., UE 101-2) can participate in Scheme 1 sidelinks by communicating with another UE within the coverage area. For example, if UE 101-1 is within the coverage area, base station 111 can transmit resource allocation to UE 101-1, and UE 101-1 can "forward" or "relay" the configuration information and resource allocation to UE 101-2 outside the coverage area. Although any UE in UE 101 may not be covered by the radio cells of the radio access network (RAN) node, such as base station 111, at some point or all time, and can still communicate autonomously with each other using sidelinks, one or more UEs in UE 101 can also communicate with and establish connections with base station 111 (e.g., communicatively coupled to base station).

[0031] UE 101 may include any mobile computing device or non-mobile computing device, such as consumer electronics devices, cellular phones, smartphones, feature phones, tablets, wearable computing devices, personal digital assistants (PDAs), pagers, wireless handheld devices, desktop computers, laptops, in-vehicle infotainment (IVI), in-vehicle entertainment (ICE) devices, instrument panel (IC), head-up display (HUD) devices, onboard diagnostic (OBD) devices, in-vehicle mobility equipment (DME), mobile data terminal (MDT), electronic engine management system (EEMS), electronic / engine control unit (ECU), electronic / engine control module (ECM), embedded systems, microcontrollers, control modules, engine management system (EMS), connected or “smart” appliances, machine-type communication (MTC) devices, machine-to-machine (M2M) devices, Internet of Things (IoT) devices, etc.

[0032] In some respects, RAN 110 can be a next-generation (NG) RAN or 5G RAN, an evolved-UMTS terrestrial RAN (E-UTRAN), or a legacy RAN such as UTRAN or GERAN. As used herein, the term “NG RAN” and the like can refer to RAN 110 operating in NR or 5G systems, while the term “E-UTRAN” and the like can refer to RAN 110 operating in LTE or 4G systems.

[0033] SL-PRS Resource allocation In Scheme 2 SL-PRS communication, the UE autonomously allocates resources for SL-PRS in time and frequency, without obtaining resource allocation from the base station. The resource set can be selected from one or more SL-PRS resource pools. In some respects, a resource pool is a (pre)configured set of available resources (RBs) and symbols for use by several UEs for SL data or signaling communication. SL-PRS shares some traditional sidelink resource pools (referred to as "shared resource pools") with sidelink data communication and also has other resource pools dedicated to SL-PRS communication (referred to as "dedicated resource pools"). It is worth noting that throughout this specification, sidelink data communication is also referred to as "sidelink communication," which does not imply the inclusion of sidelink reference signaling communication. Dedicated resource pools for SL-PRS may be associated with one or more traditional sidelink resource pools or shared resource pools, such as including selected time slot groups from one or more traditional sidelink resource pools or shared resource pools dedicated to SL-PRS communication.

[0034] In some aspects, the resource pool for SL-PRS is divided into multiple sub-channels, and the resources for SL-PRS are indexed by sub-channel labels. Each sub-channel consists of a group of RBs (Resource Blocks) in time and frequency resources, such as one or more time slots. The number of RBs in a sub-channel corresponds to the sub-channel size. The sub-channel size can be defined or (pre)configured. For example, a sub-channel can be defined as a group of 4, 10, 15, 20, 25, 50, 75, or 100 RBs and one time slot. One or more sub-channels can be allocated to SL-PRS. The number of sub-channels allocated to SL-PRS can be (pre)configured. In some aspects, the RB groups or sub-channels in the frequency domain used for SL-PRS are the same as those used for sidelink communication. In some alternative aspects, the RB groups or sub-channels in the frequency domain used for SL-PRS are predefined or (pre)configured separately for the entire system because the frequency resource requirements for sidelink communication and SL-PRS are different. In some aspects, a (pre-)configured number of RB groups or subchannels are allocated to the SL-PRS. The number and location of RB groups or subchannels may be indicated by a starting RB group and an ending RB group, or a starting RB group and multiple RB groups. In other aspects, the allocation of SL-PRS resources in the frequency domain is indicated by RBs. For example, SL-PRS resources can be defined by referring to parameters including a starting PRB and an ending PRB, or a starting PRB and a frequency range. Parameters for SL-PRS resources may also include SL-PRS comb size and comb offset. SL-PRS comb size indicates the number of subcarrier intervals per 12 subcarriers used. Comb offset indicates the subcarrier offset from the edge of the resource block. For example, comb size 4 with comb offset 0 indicates that subcarriers 0, 4, and 8 of the resource block are used for SL-PRS, while comb size 6 with comb offset 1 indicates that subcarriers 1 and 7 of the resource block are used for SL-PRS. Parameters for SL-PRS resources may also include SL-PRS periodicity for periodic and / or semi-persistent SL-PRS.

[0035] In the time domain, considering that SL-PRS typically requires shorter transmission times, resources for SL-PRS can be allocated to a minimum time unit smaller than the minimum time unit used for sidelink communication, allowing for more timely scheduling of SL-PRS and improved resource efficiency. In some aspects, the minimum time unit is a predefined number of symbols, such as sub-slots with a duration less than the time unit of a time slot. In the NR sidelink, the number of time slots in a subframe is equal to 2µ, where µ is the SCS configuration factor. Since the subframe duration is 1ms, the time slot duration is 2µ. -µThe value is given in milliseconds (ms). Therefore, a larger SCS results in a shorter slot duration. Depending on whether a normal CP or a longer extended CP is used, each slot consists of 14 or 12 OFDM symbols, respectively. In this specification, OFDM symbols are also simply referred to as symbols. As mentioned, sub-slots have a duration shorter than a slot. For example, a sub-slot can be a single symbol or multiple symbols, such as 2, 4, 6, or 8 symbols. In one aspect, the size of a sub-slot is predefined. Alternatively, the size of a sub-slot is (pre)configured. In one aspect, only one sub-slot or a fixed and predefined number of sub-slots can be allocated to each SL-PRS. Alternatively, a (pre)configured number of sub-slots can be allocated to an SL-PRS. The number of sub-slots can be indicated by a start sub-slot and an end sub-slot, or by a start sub-slot and a duration. In some aspects, sub-slots are defined across slot or subframe boundaries and can be indicated by a label index. In some other aspects, the allocation of SL-PRS resources in the time domain is indicated by symbols. For example, SL PRS resources can be defined by referring to one SL PRS start symbol and multiple SL PRS symbols. In some additional aspects, time-domain resources are implicitly defined by the duration of the sidelink resources. Sidelink resources are configured with the desired number of symbols. Resource allocation can be indicated by the start symbol of the assigned resource. In some aspects, FDM or comb-multiplexed SL-PRS resources will have (a) the same time-domain size, (b) different time-domain sizes but predefined boundaries, or (c) be fully flexibly defined by symbols.

[0036] Figure 8 Figure 800 illustrates some examples of SL-PRS resource allocation according to some aspects of this disclosure. Although sub-channels are defined, SL-PRS resource allocation may include an integer number or a fractional number of sub-channels. In some aspects, for SL-PRS allocation using a shared resource pool, SL-PRS resources may be allocated based on an integer number of sub-channels used for SL communication or a separate number of sub-channels used for SL-PRS. In other aspects, for SL-PRS allocation using a dedicated resource pool, SL-PRS resources may be allocated comprising a fractional number of sub-channels, the fraction being the ratio of the number of resource elements occupied by the SL-PRS to the number of resource elements per sub-channel. As some examples, Figure 8 The SL-PRS 1-6 are allocated 3, 13 / 14, 7 / 14, 11 / 14, 8 / 14 and (3+3 / 14) sub-channels respectively.

[0037] Figure 2A signaling diagram for Scheme 1 SL-PRS communication is illustrated according to some aspects of this disclosure. UEs 101-1 and 101-2 receive configuration and control information from base station 111 to allocate time-frequency resources for SL-PRS communication. In some aspects, similarly... Figure 3 As illustrated, the control information sent by base station 111 to UEs 101-1 and 101-2 indicates time slot offset 301 and / or sub-time slot offset 302 to determine the first time slot / sub-time slot / symbol to be transmitted for SL-PRS. In some aspects, time slot offset 301 and / or sub-time slot offset 302 are included in the DCI and can be annotated and indexed to the SL-PRS offset table provided by higher-layer parameters.

[0038] Return to reference Figure 2 As shown in action 201, in some aspects, Type 2 sidelink configuration grant is used to schedule SL-PRS. Base station 111 transmits a configuration grant configuration to UE 101-1 to configure Type 2 configuration grant. In some aspects, at action 201-2, base station 111 additionally transmits a configuration grant configuration to UE 101-2 to indicate Type 2 configuration grant. In some aspects, the configuration grant configuration is included in higher-layer communications such as Radio Resource Control (RRC) signaling. In some alternative aspects, UE 101-2 is not within the coverage area of ​​base station 111. In this scenario, at action 202-2, UE 101-1 forwards resource allocation to UE 101-2 via a sidelink, thereby allowing UE 101-2 to receive resource allocation without communicating with base station 111. In some aspects, resources for SL-PRS may, for example, be in RRC IE sl-PRS_resources The instruction states that Type 2 configuration grants are configured upon receiving a configuration grant, but are not activated until an activation command is received.

[0039] As shown in action 202, base station 111 activates type 2 configuration grant and / or additionally or alternatively specifies the resources to be used for SL-PRS. Additionally, in some alternative aspects, sidelink dynamic scheduling can be used to schedule SL-PRS, where base station 111 transmits a resource allocation to UE 101-1 indicating time-frequency resources for transmitting SL-PRS. In some aspects, base station 111 may also transmit resource allocation to UE 101-2 for receiving SL-PRS. Alternatively, as shown in action 202-2, UE 101-1 may forward configuration grant activation and / or SL-PRS resource indication to UE 101-2 (e.g., if UE 101-2 is not within the coverage area of ​​base station 111). Resource allocation may be included in control information such as downlink control information (DCI). Time-frequency resources may be, for example, in the SL-PRS resource index field of the DCI. SL-PRS resource indexThe DCI indicates that the SL-PRS resource index field indexes the time-frequency resources used for SL-PRS. Resource allocation can be transmitted on the Physical Downlink Control Channel (PDCCH). As discussed, activation and / or indications can be included in the DCI. In some aspects, the DCI is DCI format 3_0. In other aspects, the DCI has a new DCI format specifically for SL-PRS grants, which may be referred to as DCI format 3_X, where X is an integer index number, such as 2, 3, 4, etc.

[0040] The DCI includes a conventional time slot field for determining the resource allocation of the first time slot used for transmitting sidelink data for sidelink communication upon DCI arrival. In some alternative aspects, the DCI includes an SL-PRS time slot field for determining the first time slot used for transmitting the SL-PRS. In some aspects, the conventional time slot is used for SL-PRS utilizing a shared resource pool, while the SL-PRS time slot is used for SL-PRS utilizing a dedicated resource pool. In some aspects, the new time slot field includes a value x that provides an index x+1 to the SL-PRS time slot offset “Ksl_prs” in the time slot / sub-time slot offset table. In some aspects, the SL-PRS time slot offset Ksl_prs is different from or less than the time slot offset used for sidelink communication. The time slot / sub-time slot table is defined by higher-layer parameters (e.g., sl-DCI-ToSLPRS_Trans The higher-level parameter configures the slot offset. In some respects, the sub-slot offset is also indicated by the DCI. The sub-slot offset can be specified in a separate field (e.g., Time_domain_resource_ allocation As indicated in the documentation, this separate field includes an index to the sub-slot offset within the time slot. The time slot / sub-slot table is defined by higher-level parameters (e.g., ...). sl-DCI-ToSLPRS_Trans The higher-level parameter configuration specifies the sub-slot offset.

[0041] In some respects, the start time of an SL-PRS slot can be calculated as follows: TDL - Ta / 2 + Ksl_prs × Tslot, where TDL is the start time of the DL slot carrying the DCI, TA is the timing advance value of the TAG corresponding to the serving cell on which the DCI is received, Ksl_prs is the slot offset determined by the "time slot" field as discussed above, and Tslot is the slot duration.

[0042] At action 206, an SL-PRS is sent from UE 101-1 to UE 101-2. At action 208, UE 101-2 measures the SL-PRS and transmits a measurement report to UE 101-1 at action 210. The measurement report may include or be based on the results of the performed SL-PRS measurement.

[0043] SL-PRS Congestion control Figure 4 Scheme 2 signaling procedures involving congestion control for transmitting / receiving SL-PRS between UEs 101-1 and 101-2, according to some aspects of this disclosure, are illustrated. UE 101-1 selects time-frequency resources from at least one resource pool for transmitting one or more SL-PRS. Congestion handling for the SL-PRS is performed based on (pre)congestion control constraints. Parameters of the SL-PRS can be modified during congestion handling to reduce SL-PRS transmission and thus reduce congestion. As shown in action 401, resource pool information is shared by multiple UEs, including UE 101-1 as the transmitting UE and UE 101-2 as the receiving UE. The resource pool information indicates at least one resource pool for the SL-PRS. The resource pool information may be included in a (pre)configured resource pool signaled from a base station, or previously communicated and stored in the UE or another storage medium without connection to the base station, and thus can be used when one or more UEs are outside coverage. The resource pool may include a dedicated SL-PRS resource pool and / or a shared SL-PRS pool associated with a traditional sidelink resource pool. In some aspects, the shared SL-PRS resource pool includes time slots reserved for SL-PRS from existing sidelink resource pools. The shared SL-PRS resource pool may be associated with a traditional sidelink resource pool, and the reserved SL-PRS time slots may come from the traditional sidelink resource pool.

[0044] In some aspects, as shown in action 402, congestion control information for SL-PRS communication is received. In some aspects, the congestion control information includes an SL-PRS channel occupancy (CR) limit indicating the maximum CR. The SL-PRS CR limit can be (pre)configured by higher-layer parameters. For example, the SL-PRS CR limit can be determined by the RRC IE. sl-PRS-CR-Limit Instructions. In some respects, multiple SL-PRS CR limits are pre-configured to be associated with a series of priority levels, respectively.

[0045] As shown in action 404, resources for transmitting SL-PRS from UE 101-1 to UE 101-2 are determined. In some aspects, UE 101-1 selects resources for SL-PRS transmission. As an example, resource selection includes: decoding SCIs from other UEs (e.g., resource reservations received on the PSCCH from UE 101-4 / 104-5 as shown in action 403); and comparing the Reference Signal Received Power (RSRP) associated with the SCI. If an SCI with reserved resources is received from another UE and that SCI has a high associated RSRP, UE 101-1 may choose not to use certain resources. The SCI indicates that the resource has been reserved by another UE, and the high associated RSRP indicates that interference is possible if UE 101-1 attempts to use the resource.

[0046] As shown in action 405, congestion handling is performed based on the congestion control information used for SL-PRS. If congestion criteria are met, the resources used for sending SL-PRS can be updated. For example, if the SL-PRS CR used for sending SL-PRS exceeds the SL-PRS CR limit, the parameters of the resources can be modified. For example, the following will be related to... Figures 5 to 8 Further details on congestion handling will be discussed in connection with this discussion.

[0047] At action 406, after performing congestion handling, UE 101-1 transmits a resource reservation for the selected resources to other UEs 101-4 / 101-5. The resource reservation may include an SCI level 1 format and may be transmitted on the PSCCH. Alternatively, the resource reservation may include a single-level SCI and may be transmitted on the PSSCH. A single-level SCI is used, for example, for a dedicated resource pool.

[0048] At action 407, UE 101-1 transmits a resource indication to UE 101-2 so that UE 101-2 can receive and decode the SL-PRS in the selected resources. In some aspects, the resource indication may include SCI level 1 format transmitted on the PSCCH, followed by SCI level 2 format transmitted on the PSSCH.

[0049] In some aspects, resource reservation / indication includes indexes to resource pools such as shared sidelink resource pools or dedicated SL-PRS resource pools, as described throughout this specification. In other aspects, resource reservation / indication includes SL-PRS resource indexes indicating time-frequency resources. SL-PRS resource indexes may be indicated in an SL-PRS resource index field in the SCI, which resembles, for example, an index field for time-frequency resources. Figure 2 The associated description of the SL-PRS resource index field in the DCI for dynamic granting.

[0050] In some aspects, resource reservation / indication also includes time slots for SL-PRS transmission. The time slot indication may be used in conjunction with an SL-PRS resource index. For example, the time slot indication indicates a time slot, and the SL-PRS resource index indicates resources within that time slot. In some aspects, resource reservation / indication also includes periodicity of resource reservation, and resources are reserved periodically according to this periodicity. In some aspects, resource reservation / indication also includes time intervals. Time intervals may be configurable or predetermined values. SL-PRS can be transmitted in a first time slot after a time interval for SL-PRS indication / reservation.

[0051] At actions 206 and 208, UE 101-1 sends the SL-PRS in the indicated / reserved resources, UE 101-2 receives the SL-PRS in the reserved resources, and UE 101-2 measures the SL-PRS. After measuring the SL-PRS, at action 210, UE 101-2 transmits a measurement report to UE 101-1 including or based on the results of the SL-PRS measurement.

[0052] Figure 5 This is an example of a logical flow for channel congestion in SL-PRS, based on some aspects of this disclosure. In some aspects, the UE will assess one or more channel conditions to determine whether the channel conditions and / or reservations for SL-PRS are excessively congested. Based on this assessment, the UE may modify SL-PRS parameters or even stop SL-PRS transmission to reduce congestion.

[0053] In some respects, at action 510, the UE sends an SL-PRS. As an example, the UE may be as shown in other figures in this specification, such as those above. Figure 1 or Figure 4 The UE 101-1 described in connection with this. As described, SL-PRS transmission can be scheduled by selecting resources in the selection window after sensing resource reservation in the sensing window before the selection window through the resource allocation process of Scheme 2.

[0054] In some respects, at action 520, the UE checks whether the SL-PRS CBR exceeds the SL-PRS CBR threshold used for transmitting SL-PRS. If the SL-PRS CBR is greater than the SL-PRS CBR threshold, the UE can modify the parameters for SL-PRS transmission or even stop SL-PRS transmission in order to reduce channel congestion, as shown in action 540.

[0055] In some respects, at action 530, the UE checks whether the SL-PRS CR exceeds the SL-PRS CR threshold used for transmitting SL-PRS. The SL-PRS CR threshold can be the SL-PRS CR limit discussed above. If the SL-PRS CR is greater than the SL-PRS CR threshold, the UE can modify the parameters for SL-PRS transmission and then use the modified resources to transmit the SL-PRS to another UE to reduce channel congestion, as shown in action 540. Alternatively or additionally, the UE can even stop transmitting SL-PRS. Otherwise, no congestion control procedure is required, and SL-PRS can be transmitted as allocated, as shown in action 550. It is worth noting that, although... Figure 5 Both SL-PRS CBR and SL-PRS CR are shown for use in congestion handling procedures, but either SL-PRS CBR or SL-PRS CR can be used alone in another congestion handling procedure.

[0056] More specific details regarding CBR / CR evaluation are now provided. In some aspects, SL-PRS CR or SL-PRS CBR can be evaluated separately from SL-PRS CR or SL-PRS CBR for sidelink communication, and separately for shared resource pools and dedicated resource pools, so that the congestion status of shared resource pools and dedicated resource pools can be determined independently for accuracy. In some alternative aspects, for simplicity and efficiency, SL-PRS CR or SL-PRS CBR can be evaluated jointly for shared resource pools and dedicated resource pools. For further simplicity and efficiency, in some further alternative aspects, joint evaluation SL-PRS CR or SL-PRS CBR can be sent for all sidelinks including both shared resource pools and dedicated resource pools. Alternatively, SL-PRS CR or SL-PRS CBR can be evaluated jointly only for shared resource pools with sidelink communication, while evaluation is separate for dedicated resource pools with sidelink communication. In cases where the SL-PRS CR or SL-PRS CBR is jointly evaluated for the shared resource pool and sidelink communication, in some respects, the evaluation may be based solely on the CR or CBR of the sidelink communication, since the SL-PRS will come from the same UE and be FDMed with the PSCCH / PSSCH, and therefore may have the same CR or BR as the corresponding sidelink communication.

[0057] Figure 6This is a diagram illustrating time-frequency resources for SL communication and SL-PRS according to some aspects of this disclosure, showing examples of the definitions of SL-PRS CR and SL-PRS CR constraints. For sidelink communication, the sidelink CR evaluated at time slot n is the total number of subchannels allocated for its transmission in time slot [na, n-1] and in time slot [n, n+b] divided by the total number of subchannels configured in the transmission pool within [na, n+b], where a+b+1 = 1000 or 1000·2µ time slots, depending on higher-layer parameters (e.g., sl-prs-TimeWindowSizeCR ), b < (a + b + 1) / 2, and n + b should not exceed the last transmission opportunity granted for the current transmission. The sidelink CBR measured in slot n is defined as the SL RSSI measured by the UE in the sub-channel of the resource pool exceeding the CBR measurement window [ n - a , n -1] A portion of the (pre)configured threshold sensed within the internal sensing, wherein the threshold is determined based on higher-layer parameters. sl-TimeWindowSizeCBR , a Equal to 100 or 100·2 µ Each time slot.

[0058] In some respects, SL-PRS CR or SL-PRS CBR is evaluated or measured by normalizing the size of time and frequency resources. In one respect, frequency resources can be normalized using either the SL-PRS resource pool or the actual SL-PRS resources. In another respect, SL-PRS CR or SL-PRS CBR is evaluated by normalizing from the SL-PRS physical resources, where physical resources = frequency resource allocation (RB or subchannel) × time resource allocation (symbol) / (comb size × interleaving ratio), where (comb size × interleaving ratio) = maximum effective comb size. Therefore, as an example, SL-PRS CBR can be measured at time slot n and is the portion of the sidelink received signal strength indicator (RSSI) in the SL-PRS resources within the resource pool that exceeds the RSSI threshold within the SL-PRS CBR measurement window. The RSSI threshold can be configured or pre-configured.

[0059] On the other hand, the SL-PRS CR or SL-PRS CBR is evaluated by mapping SL-PRS resources to reference SL-PRS resources based on the physical resources occupied. Reference SL-PRS resources can be specified by a higher layer or signaled. Therefore, as an example, the SL-PRS CR evaluated at slot n can be defined as the total number of actual physical resources allocated for its transmission in slot [na, n-1] and in slot [n, n+b] divided by the total number of reference resources configured in the transmission pool within [na, n+b].

[0060] As an example, we estimate and measure SL-PRS CR or SL-PRS CBR for a dedicated resource pool. For SL-PRS CR, since SL-PRS has a different resource allocation configuration than sidelink communication, the parameters used for SL-PRS CR or SL-PRS CBR can be adjusted by defining the following: (a) frequency domain allocation units, e.g., subchannels; (b) the number of resource elements per frequency domain allocation unit, which depends on the comb structure and whether interleaving is supported, i.e., fully interleaved, partially interleaved, or non-interleaved; and / or (c) time domain allocation units, e.g., how many symbols are allocated. In some respects, frequency and time domain allocation units (e.g., subchannels and subslots) are predefined, while in others they are (pre)configured. In some respects, SL-PRS CR or SL-PRS CBR is estimated through the following process: first, defining SL-PRS allocation units (consisting of frequency domain allocation units (e.g., sub-channels) and time domain allocation units (e.g., sub-time slots); then dividing the number of SL-PRS allocation units by the comb size; and then... n The SL-PRS CR evaluation at the location is the total number of SL-PRS allocation units divided by the number of units used for their allocation in the time slot [ na , n-1 The transmission is performed in the [time slot]. n , n+b The comb tooth size granted in ] {or the number of comb tooth sizes normalized in the SL-PRS allocation unit} divided by the number of comb tooth sizes in [ na , n+b The total number of SL-PRS allocation units configured in the internal transmission pool.

[0061] In the time slot n The SL-PRS CBR is measured in the resource pool as the SLRSSI measured by the UE in the PRS allocation unit exceeds the CBR measurement window. n - a , n -1] Part of the (pre)configured threshold sensed within the internal sensor.

[0062] In some other aspects, the SL-PRS CR or SL-PRS CBR is evaluated using a time window that is the same as or separate from the time window used for the CR or CBR for sidelink communication. Therefore, in some aspects, the SL-PRS CR measurement window is defined as [na, n+b], where a and b are determined by the UE implementation in which the parameter values ​​are separate and different from those for sidelink communication. However, similar limitations still apply: that is, for SL-PRS CR, a+b+1 = 1000 or 1000·2µ slots, depending on the higher-layer parameters (e.g., ...). sl-prs-TimeWindowSizeCR), b < (a + b + 1) / 2, and n + b should not exceed the last transmission opportunity granted for the current transmission. In some respects, the SL-PRS CBR measurement window is defined as [ n - a , n -1], where based on higher-level parameters (e.g., sl-prs-TimeWindowSizeCBR ), a Equal to 100 or 100·2 µ Each time slot.

[0063] Figure 6 A schematic timing diagram of the congestion control process for SL-PRS is shown. In some aspects, in time slots... n The evaluation of SL-PRS CR or SL-PRS CBR, in which n Prior to the first time slot determined for transmitting the first SL-PRS m Congestion control processing time N In some respects, SL-PRS CR and congestion control processes are defined separately from traditional sidelink communication. Congestion control processing time. N It is the congestion control processing time for communication with the side link. N’ The UE capabilities are implemented separately and may not be equal to the congestion control processing time of the link communication on that side.

[0064] In some respects, such as those mentioned above and Figure 4 and Figure 5 In connection with this discussion, the reception of congestion control information for SL-PRS includes multiple SL-PRS CR limits, each associated with a priority level. In some aspects, the SL-PRS to be transmitted is assigned a priority level. k In that case, the SL-PRS CR is the sum of all SL-PRS CRs evaluated in slot n associated with a priority level lower than the priority level assigned to the SL-PRS: in The evaluation CR is sent for PSSCH in time slot n=mN, where the "priority" field in SCI is set to... i ,and Corresponding to high-level parameters associated with priority value k and CBR range sl-PRS-CR- Limit The CBR range includes the CBR measured in time slot mN, where N is the congestion control processing time.

[0065] In some other respects, if the SL-PRS to be transmitted is not assigned a priority level, then the SL-PRS can be considered as having the highest priority (k=0). The SL-PRS CR of the SL-PRS is in the time slot. n The sum of all SL-PRS CRs evaluated in the test must be less than the SL-PRS CR limit when k=0.

[0066] In some alternatives, PSSCH and SL-PRS congestion control are combined, and the definitions of SL-PRS CR or SL-PRS CBR revert to the traditional definitions, where CR ( i The congestion control processing time for the SL-PRS CR was modified to incorporate both PSSCH and SL-PRS transmissions. In that case, the processing time for the SL-PRS CR was... N It can also be used with congestion control processing time for sidelink communication. N’ same.

[0067] Figure 7 Example graphs of congestion control processing times according to some aspects of this disclosure are shown. As shown in Figures 700A and 700B, the congestion control processing times for SL-PRS are... N Congestion control processing time for sidelink communication N’ Same. Congestion control processing time N The number of time slots can be based on a parameter set and UE capabilities. For example, Figure 700A is used for the first capability, while Figure 700B is used for the second capability. In some alternative aspects, it can be related to the congestion control processing time used for sidelink communication. N’ There are differences. For example, Figure 700A is used for the first capability and has a control processing time for sidelink communication. N’ Twice the congestion control processing time N Similarly, Figure 700B is used for the second capability and has control processing time for sidelink communication. N’ Twice the congestion control processing time N .

[0068] In some aspects, congestion handling includes modifying one or more parameters of the SL-PRS resource if the SL-PRS CR exceeds the SL-PRS CR limit, such as increasing the comb size, reducing time or frequency resources, or reducing the retransmission amount of the first SL-PRS. The number of SL-PRS resources or transmission power may also be reduced to reduce and control congestion.

[0069] SL-PRS UE Inter-coordination In some scenarios, such as Round-Trip Time (RTT) positioning, the SL-PRS is bidirectional, where the first SL-PRS is sent from the first UE and received by the second UE, and the second SL-PRS is sent from the second UE and received by the first UE. In these cases, coordinated timing between the first and second UEs is required to schedule the transmission and retransmission of the SL-PRS. For example, the first and second SL-PRS can be transmitted alternately within the RTT, and thus the second SL-PRS can be scheduled within the time window between two transmissions of the first SL-PRS. For out-of-order RTT transmissions, the second SL-PRS can be transmitted or retransmitted after at least two consecutive transmissions / retransmissions of the first SL-PRS, and thus the second SL-PRS can be scheduled within the time window following at least two consecutive transmissions / retransmissions of the first SL-PRS. Achieving the desired transmission order is easier by using either the first or second UE to select and reserve resources for both the first and second SL-PRS.

[0070] Figure 9 This example illustrates signaling between multiple UEs 101, including a UE (e.g., reserved UE 101-1) for determining SL-PRS resources for another UE (e.g., target UE 101-3), according to some aspects. In some aspects, reserved UE 101-1 receives configuration information for SL-PRS communication for target UE 101-3 (Action 901). Taking into account SL-PRS resource reservations received from other UEs 101-4 / 101-5, reserved UE 101-1 selects and reserves resources for the target UE to transmit the target SL-PRS (Action 902). SL-PRS resource reservations can be received on the PSCCH. Reserved UE 101-1 then sends resource selection information to target UE 101-3 to indicate the resources used for transmitting the target SL-PRS (Action 903-1). In some aspects, the resources selected or reserved for target UE 101-3 are assigned high priority or indicated as prioritized using flags. In some aspects, RSRP checks are not performed for the resources selected and reserved for target UE 101-3. By prioritizing resource selection or reservation for target UE 101-3, an appropriate SL-PRS transmission order for RTT positioning is achieved. The resources used to transmit the target SL-PRS can be indicated by MAC-CE. Resource selection information is transmitted to target UE 101-3 on the Physical Side Link Shared Channel (PSSCH) using up to two scheduled retransmissions. In some aspects, reserved UE 101-1 also transmits the first SL-PRS to the target UE on the same PSSCH carrying control information for the target SL-PRS (Action 903-2).

[0071] UE 101-1 also sends a side link control message (SCI) indicating resource reservation information to other UEs 101-4 / 101-5 on the physical side link control channel (PSCCH) to reserve resources for the transmission of the target SL-PRS (Action 904).

[0072] At action 206, the target SL-PRS is transmitted from the target UE 101-3 in the resources indicated by the reserved UE 101-1. In some aspects, the target SL-PRS is sent back to the reserved UE 101-1. At action 208, the reserved UE 101-1 measures the SL-PRS and transmits a measurement report to the target UE 101-3 at action 210. The measurement report may include or be based on the results of the target SL-PRS measurement performed.

[0073] Figure 10 The illustration illustrates signaling between multiple UEs 101, including UEs (e.g., reserved UE 101-1) for determining and instructing time windows for SL-PRS resources used for another UE (e.g., target UE 101-3), based on several aspects. The actual SL-PRS resource selection and reservation can still be performed by target UE 101-3. SL-PRS resources can be assigned high priority.

[0074] In some aspects, reserved UE 101-1 and target UE 101-3 receive configuration information for SL-PRS communication, which includes, for example, a resource pool (pre)configuration for a dedicated resource pool for SL-PRS (Action 1001). In some aspects, reserved UE 101-1 then sends a time window to target UE 101-3, which indicates one or more time frames for SL-PRS resources for target UE 101-3 to transmit the target SL-PRS (Action 1002).

[0075] Then, one or more rounds of communication are made (as discussed, sequentially or out of order) between the first SL-PRS from reserved UE 101-1 to target UE 101-3 and the target SL-PRS sent within the provided time window from target UE 101-3 to reserved UE 101-1. Although a first SL-PRS followed by a target SL-PRS is described in the following example for illustrative purposes, the selected amount and order of SL-PRS between reserved UE 101-1 and target UE 101-3 are contemplated. Moreover, either reserved UE 101-1 or target UE 101-3 can be used as the primary UE for handling SL-PRS measurements in two modes for purposes such as RTT positioning.

[0076] As shown in Action 1003-1, taking into account the SL-PRS resource reservations received from other UEs 101-4 / 101-5 (e.g., on the PSCCH) within the sensing window, the reserving UE 101-1 senses, selects, and reserves resources for transmitting the first SL-PRS. The reserving UE 101-1 then sends resource selection information to the target UE 101-3 to indicate the resources used for transmitting the first SL-PRS (Action 1003-2). At Action 1003-3, the reserving UE 101-1 transmits the first SL-PRS to the target UE 101-3. The reserving UE 101-1 also sends Sidelink Control Information (SCI) indicating resource reservation information to other UEs 101-4 / 101-5 on the Physical Sidelink Control Channel (PSCCH) to reserve resources for transmitting the first SL-PRS. At action 208, target UE101-3 measures SL-PRS, and at action 210, transmits a measurement report to reserved UE 101-1. The measurement report may include or be based on the results of the first SL-PRS measurement performed.

[0077] As shown in action 1004-1, in some aspects, target UE 101-3 senses, selects, and reserves resources for transmitting the target SL-PRS within the time window indicated by reserved UE 101-1 (e.g., at action 1002). Target UE 101-3 then sends resource selection information to reserved UE 101-1 to indicate the resources used for transmitting the target SL-PRS (action 1004-2). Although in Figure 10 Not shown, but target UE 101-3 also communicates sidelink control information (SCI) indicating resource reservation information with other UEs 101-4 / 101-5 on the physical sidelink control channel (PSCCH). At action 1004-3, target UE 101-3 sends the target SL-PRS to reserved UE 101-1. At action 1004-4, reserved UE 101-1 measures the target SL-PRS. Reserved UE 101-1 can process the measurement results together with the measurement report received from target UE 101-3 for purposes such as RTT positioning. As discussed above, although in Figure 10 Although not explicitly shown, measurement reports may alternatively be collected at target UE 101-3 for processing.

[0078] Figure 11This illustration illustrates signaling between multiple UEs 101, including a first UE (e.g., Tx UE 101-1), for receiving and using inter-UE coordination information from auxiliary UEs (e.g., auxiliary UEs 101-7 / 101-2 / 101-3) to allocate resources for transmitting SL-PRS, as shown in action 1120. As shown in action 1130, Tx UE 101-1 then transmits resource allocation information to indicate resources, followed by transmitting SL-PRS using the selected resources. In some aspects, transmitting UE 101-1 cannot directly receive the SL-PRS resource reservation of the hidden UE 101-6, and therefore may be scheduled to transmit SL-PRS on resources that interfere with the SL-PRS transmission of the hidden UE 101-6. By using auxiliary UEs 101-7 / 101-2 / 101-3 to relay the SL-PRS resource reservation of the hidden UE 101-6 to the transmitting UE 101-1, the transmitting UE 101-1 can consider the SL-PRS resource reservation of the hidden UE 101-6 in addition to its own sensing results, and thus can schedule more suitable SL-PRS resources and reduce potential interference.

[0079] In some aspects, such as Figure 11 As shown in action 1110 of the upper diagram, auxiliary UEs 101-7 / 101-2 / 101-3 receive hidden resource reservations from UE 101-6. The inter-UE coordination information is based on the hidden resource reservations of UE 101-6, which may not be directly received by Tx UE 101-1.

[0080] In some other aspects, such as Figure 11 As shown in the lower part of the diagram, action 1110', auxiliary UE 101-7 / 101-2 / 101-3 transmits inter-UE coordination information, which indicates or is based on the resource allocation / reservation used by auxiliary UE 101-7 / 101-2 / 101-3 to transmit to Tx UE 101-1. Auxiliary UE 101-7 / 101-2 / 101-3 cannot receive SL-PRS on resources with transmissions scheduled due to half-duplex.

[0081] In some aspects, inter-UE coordination information may include preferred / non-preferred resources for active assistance using IUC scheme 1. Inter-UE coordination information may be transmitted on the PSSCH.

[0082] In some other aspects, inter-UE coordination information may include potential SL-PRS resource conflicts regarding resource reservations for Tx UE 101-1 and hidden UE 101-6 in the case of passive auxiliary UEs using IUC scheme 2. The resource allocation for hidden UE 101-6 is received by auxiliary UEs 101-7 / 101-2 / 101-3 and may not be directly received by Tx UE 101-1. In this case, the resource reservation for Tx UE 101-1 may also be indicated to auxiliary UEs 101-7 / 101-2 / 101-3 on the SCI received on the PSCCH. After comparing the resource allocations of Tx UE 101-1 and hidden UE 101-6, inter-UE coordination information is transmitted on the Physical Side Link Feedback Channel (PSFCH), such as PSFCH format 0.

[0083] Figure 12 Examples of active assistance using IUC scheme 1 (Figure 1200A) and passive assistance using IUC scheme 2 (Figure 1200B) according to some aspects of this disclosure are illustrated. As shown in Figure 1200A, the assisting UE notifies the Tx UE of a subset of preferred / available resources {A3, B2, C4} or a subset of non-preferred / unavailable resources {A1, A2, A4, B1, B3, B4, C1, C2, C3} by transmitting inter-UE coordination information on the PSSCH for the Tx UE to allocate resources for SL-PRS transmission. As shown in Figure 1200B, the auxiliary UE receives the resource allocation from both Tx UE (the reserved resource element is marked as UE-B) and another UE (the reserved resource element is marked as UE-C), and notifies Tx UE of potential SL-PRS resource conflicts by transmitting inter-UE coordination information on PSFCH format 0 so that Tx UE can allocate resources for SL-PRS transmission, as shown by the resource elements marked as UE-B / UE-C.

[0084] In some aspects, if PSSCH or PSFCH is not configured in the dedicated resource pool used for SL-PRS transmission, inter-UE coordination information is not supported when a Tx UE needs to allocate resources for SL-PRS transmission on the dedicated resource pool. Alternatively, when inter-UE coordination information is configured, PSSCH and / or PSFCH are configured in the dedicated resource pool for transmitting inter-UE coordination information. Further alternatively, the dedicated pool resources are configured with specific shared pool resources because PSSCH and / or PSFCH are configured in the shared resource pool for transmitting inter-UE coordination information. Further alternatively, inter-UE coordination information can only be transmitted on PSSCH and / or PSFCH if resources are available in the shared resource pool. Otherwise, inter-UE coordination information for allocating resources for SL-PRS transmission may not be transmitted.

[0085] Within the shared resource pool, high priority levels can be assigned to PSSCH / PSFCH to allocate channel resources for the inter-UE coordination information to be conveyed as quickly as possible. In some additional aspects, auxiliary information is included in and transmitted within the inter-UE coordination information, indicating parameters such as the time required to assess resource occupancy or conflicts.

[0086] In some aspects, a time window is configured within which inter-UE coordination information can be reported. In one specific implementation, if the time window for reporting inter-UE coordination information is exceeded, the inter-UE coordination information can be discarded. A flag can be sent back to the auxiliary UE to notify it of the discarding of the inter-UE coordination information.

[0087] Figure 13 This illustration describes a process flow for a UE to communicate an SL-PRS in the presence of congestion control, according to some aspects of this disclosure. At action 1310, the UE receives congestion control information for SL-PRS communication. At action 1320, the UE determines resources for transmitting a first SL-PRS to a second UE. At action 1330, congestion handling is performed based on the congestion control information for SL-PRS communication. At action 1340, after performing congestion handling, the SL-PRS is transmitted to the second UE. The process flow described in this disclosure, such as with... Figure 4 Additional procedural steps and other details associated with the signaling shown can be incorporated into this process.

[0088] Figure 14 The following illustrates a logical flow for a UE to communicate SL-PRS with coordinated resource reservations, according to some aspects of this disclosure. As shown in flowchart 1400A, in some aspects, the reservation UE receives configuration information for SL-PRS communication for the target UE, as shown in action 1410. At action 1420, the reservation UE sends resource selection information to the target UE to indicate the resources available for the target UE to transmit the target SL-PRS.

[0089] In some aspects, resource selection information may include a time window within which the target SL-PRS is scheduled. The target UE then receives the resource selection information for the time window (action 1430), senses and selects resources for transmitting the target SL-PRS (action 1440), and uses the determined resources to transmit the target SL-PRS (action 1450), as shown in flowchart 1400B. The time window may be transmitted on the physical side link control channel (PSCCH). The resource selection information described in this disclosure, such as... Figure 10 Additional procedural steps and other details associated with the signaling shown can be incorporated into this process.

[0090] Alternatively or additionally, the resources used to transmit the target SL-PRS are included in the resource selection information. The reserved UE can sense the selected resources and transmit the information to the target UE using up to two scheduled retransmissions. The target UE receives this resource selection information (action 1460) and uses the selected resources to transmit the target SL-PRS (action 1470), as shown in flowchart 1400C. The resources described in this disclosure, such as those related to... Figure 9 Additional procedural steps and other details associated with the signaling shown can be incorporated into this process.

[0091] Figure 15 This document illustrates a process flow for a UE to transmit SL-PRS in the presence of inter-UE coordination information, according to some aspects of this disclosure. At action 1510, the UE receives inter-UE coordination information from an auxiliary UE for allocating resources for transmitting SL-PRS. Then, as shown in action 1520, the UE determines resources for transmitting SL-PRS from a dedicated resource pool based on the inter-UE coordination information. Then, at action 1530, the UE uses the resources determined from the dedicated resource pool to transmit SL-PRS. In some aspects, a Physical Side Link Shared Channel (PSSCH) or a Physical Side Link Feedback Channel (PSFCH) is configured to transmit the inter-UE coordination information. The methods described in this disclosure, such as those related to... Figures 11 to 12 Related additional process steps and other details can be incorporated into this process.

[0092] Figure 16This is an illustration of examples of components of a device according to one or more embodiments described herein. In some embodiments, device 1600 may include at least application circuitry 1602, baseband circuitry 1604, RF circuitry 1606, front-end module (FEM) circuitry 1608, one or more antennas 1610, and power management circuitry (PMC) 1612 coupled together as shown. Components of the illustrated device 1600 may be included in a UE or RAN node such as UE 101 or base station 111, as described throughout this disclosure. UE 101 and base station 111 may be configured to perform SL-PRS resource allocation as described throughout this disclosure. In some embodiments, device 1600 may include fewer elements (e.g., the RAN node may not utilize application circuitry 1602, but instead include a processor / controller to process IP data received from a core network (CN) such as 5GC or Evolved Packet Core (EPC). In some embodiments, device 1600 may include additional components such as, for example, a memory / storage device, a display, a camera, sensors (including one or more temperature sensors, such as a single temperature sensor, multiple temperature sensors at different locations in device 1600, etc.) or input / output (I / O) interfaces. In other embodiments, the components described below may be included in more than one device (e.g., the circuitry may be individually included in more than one device for a cloud-RAN (C-RAN) embodiment).

[0093] Application circuitry 1602 may include one or more application processors. For example, application circuitry 1602 may include circuitry such as, but not limited to, one or more single-core or multi-core processors. The processor may include any combination of general-purpose processors and special-purpose processors (e.g., graphics processors, application processors, etc.). The processor may be coupled to or may include such memory / storage device, and may be configured to execute instructions stored in the memory / storage device to enable various applications or operating systems to run on device 1600. In some specific implementations, the processor of application circuitry 1602 may process IP data packets received from the EPC.

[0094] Baseband circuitry 1604 may include circuitry, such as, but not limited to, one or more single-core or multi-core processors. Baseband circuitry 1604 may include one or more baseband processors or control logic components to process baseband signals received from the receive signal path of RF circuitry 1606 and generate baseband signals for the transmit signal path of RF circuitry 1606. Baseband circuitry 1604 may interact with application circuitry 1602 to generate and process baseband signals and control the operation of RF circuitry 1606. For example, in some implementations, baseband circuitry 1604 may include a 3G baseband processor 1604A, a 4G baseband processor 1604B, a 5G baseband processor 1604C, or other existing, developing, or future generations of baseband processors 1604D (e.g., 2G, 6G, etc.). Baseband circuitry 1604 (e.g., one or more of baseband processors 1604A to 1604D) may handle various radio control functions enabling communication with one or more radio networks via RF circuitry 1606. In other embodiments, some or all of the functions of the baseband processors 1604A to 1604D may be included in modules stored in memory 1604G and executed via a central processing unit (CPU) 1604E. Radio control functions may include, but are not limited to, signal modulation / demodulation, encoding / decoding, and radio frequency shifting. In some embodiments, the modulation / demodulation circuitry of the baseband circuitry 1604 may include Fast Fourier Transform (FFT), pre-decoding, or constellation mapping / demapping functionality. In some embodiments, the encoding / decoding circuitry of the baseband circuitry 1604 may include convolution, tail-biting convolution, turbo, Viterbi, or low-density parity-check (LDPC) encoder / decoder functionality. Specific implementations of the modulation / demodulation and encoder / decoder functionality are not limited to these examples and may include other suitable functionalities in other respects.

[0095] In some embodiments, the baseband circuitry 1604 may include one or more audio digital signal processors (DSPs) 1604F. The audio DSP 1604F may include elements for compression / decompression and echo cancellation, and in other embodiments may include other suitable processing elements. In some embodiments, components of the baseband circuitry may be suitably combined in a single chip, a single chipset, or disposed on the same circuit board. In some embodiments, some or all of the components of the baseband circuitry 1604 and the application circuitry 1602 may be implemented together, for example, on a system-on-a-chip (SoC).

[0096] In some implementations, baseband circuit 1604 can provide communication compatible with one or more radio technologies. For example, in some implementations, baseband circuit 1604 can support communication with NG-RAN, Evolved Universal Terrestrial Radio Access Network (EUTRAN), or other Wireless Metropolitan Area Networks (WMAN), Wireless Local Area Networks (WLAN), Wireless Personal Area Networks (WPAN), etc. Implementations of baseband circuit 1604 configured to support radio communication with more than one radio protocol may be referred to as multimode baseband circuits.

[0097] RF circuit 1606 can communicate with a wireless network using modulated electromagnetic radiation through a non-solid medium. In various embodiments, RF circuit 1606 may include switches, filters, amplifiers, etc., to facilitate communication with the wireless network. RF circuit 1606 may include a receive signal path that includes circuitry for down-converting the RF signal received from FEM circuit 1608 and providing a baseband signal to baseband circuit 1604. RF circuit 1606 may also include a transmit signal path that includes circuitry for up-converting the baseband signal provided by baseband circuit 1604 and providing an RF output signal to FEM circuit 1608 for transmission.

[0098] In some embodiments, the receive signal path of RF circuit 1606 may include mixer circuit 1606A, amplifier circuit 1606B, and filter circuit 1606C. In some embodiments, the transmit signal path of RF circuit 1606 may include filter circuit 1606C and mixer circuit 1606A. RF circuit 1606 may also include synthesizer circuit 1606D for synthesizing frequencies used by mixer circuit 1606A in both the receive and transmit signal paths. In some embodiments, mixer circuit 1606A in the receive signal path may be configured to down-convert the RF signal received from FEM circuit 1608 based on the synthesized frequency provided by synthesizer circuit 1606D. Amplifier circuit 1606B may be configured to amplify the down-converted signal, and filter circuit 1606C may be a low-pass filter (LPF) or band-pass filter (BPF) configured to remove unwanted signals from the down-converted signal to generate an output baseband signal. The output baseband signal can be provided to the baseband circuit 1604 for further processing. In some embodiments, the output baseband signal may be a zero-frequency baseband signal, but this is not required. In some embodiments, the mixer circuit 1606A in the receiving signal path may include a passive mixer, but the scope of the implementation is not limited in this respect.

[0099] In some implementations, the mixer circuit 1606A of the transmit signal path can be configured to up-convert the input baseband signal based on the synthesis frequency provided by the synthesizer circuit 1606D to generate an RF output signal for the FEM circuit 1608. The baseband signal can be provided by the baseband circuit 1604 and can be filtered by the filter circuit 1606C.

[0100] In some embodiments, the mixer circuit 1606A for the receive signal path and the mixer circuit 1606A for the transmit signal path may include two or more mixers and may be arranged for quadrature downconversion and upconversion, respectively. In some embodiments, the mixer circuit 1606A for the receive signal path and the mixer circuit 1606A for the transmit signal path may include two or more mixers and may be arranged for image suppression (e.g., Hartley image suppression). In some embodiments, the mixer circuit 1606A for the receive signal path and the mixer circuit 1606A for the transmit signal path may be arranged for direct downconversion and direct upconversion, respectively. In some embodiments, the mixer circuit 1606A for the receive signal path and the mixer circuit 1606A for the transmit signal path may be configured for superheterodyne operation.

[0101] In some embodiments, the output baseband signal and the input baseband signal may be analog baseband signals, although the scope of the embodiments is not limited in this respect. In some alternative embodiments, the output baseband signal and the input baseband signal may be digital baseband signals. In these alternative embodiments, the RF circuit 1606 may include analog-to-digital converter (ADC) circuitry and digital-to-analog converter (DAC) circuitry, and the baseband circuit 1604 may include a digital baseband interface for communication with the RF circuit 1606.

[0102] In some dual-mode implementations, separate radio IC circuits can be provided to process signals for each spectrum, but the scope of implementations is not limited in this respect.

[0103] In some specific implementations, the synthesizer circuit 1606D can be a fractional-N synthesizer or a fractional-N / N+1 synthesizer, but the scope of implementation is not limited in this respect, as other types of frequency synthesizers may also be suitable. For example, the synthesizer circuit 1606D can be a Δ-∑ synthesizer, a frequency multiplier, or a synthesizer that includes a phase-locked loop with a frequency divider.

[0104] The synthesizer circuit 1606D can be configured to synthesize an output frequency based on the frequency input and the divider control input for use by the mixer circuit 1606A of the RF circuit 1606. In some specific implementations, the synthesizer circuit 1606D can be a fractional N / N+1 synthesizer.

[0105] In some implementations, the frequency input may be provided by a voltage-controlled oscillator (VCO), although this is not mandatory. The divider control input may be provided by the baseband circuit 1604 or the application circuit 1602 according to the desired output frequency. In some implementations, the divider control input (e.g., N) may be determined from a lookup table based on the channel indicated by the application circuit 1602.

[0106] The synthesizer circuit 1606D of the RF circuit 1606 may include a frequency divider, a delay-locked loop (DLL), a multiplexer, and a phase accumulator. In some embodiments, the frequency divider may be a dual-mode divider (DMD), and the phase accumulator may be a digital phase accumulator (DPA). In some embodiments, the DMD may be configured to divide the input signal by N or N+1 (e.g., based on carry output) to provide a fractional division ratio. In some example embodiments, the DLL may include a cascaded set of adjustable delay elements, a phase detector, a charge pump, and a D-type flip-flop. In these embodiments, the delay elements may be configured to divide the VCO period into Nd equal phase groups, where Nd is the number of delay elements in the delay line. In this way, the DLL provides negative feedback to help ensure that the total delay through the delay line is one VCO period.

[0107] In some embodiments, the synthesizer circuit 1606D can be configured to generate a carrier frequency as the output frequency, while in other embodiments, the output frequency can be a multiple of the carrier frequency (e.g., twice the carrier frequency, four times the carrier frequency) and can be used with quadrature generator and frequency divider circuitry to generate multiple signals with multiple different phases relative to each other at that carrier frequency. In some embodiments, the output frequency can be the LO frequency (fLO). In some embodiments, the RF circuit 1606 may include an IQ / polarity converter.

[0108] FEM circuit 1608 may include a receive signal path, which may include circuitry configured to operate on RF signals received from one or more antennas 1610, amplify the received signals, and provide an amplified version of the received signals to RF circuit 1606 for further processing. FEM circuit 1608 may also include a transmit signal path, which may include circuitry configured to amplify signals provided by RF circuit 1606 for transmission via one or more of the one or more antennas 1610. In various specific implementations, amplification via the transmit signal path or the receive signal path may be performed only in RF circuit 1606, only in FEM circuit 1608, or in both RF circuit 1606 and FEM circuit 1608.

[0109] In some implementations, FEM circuit 1608 may include a TX / RX switch to switch between transmit mode operation and receive mode operation. The FEM circuit may include a receive signal path and a transmit signal path. The receive signal path of the FEM circuit may include an LNA to amplify the received RF signal and provide the amplified received RF signal as an output (e.g., provided to RF circuit 1606). The transmit signal path of FEM circuit 1608 may include: a power amplifier (PA) for amplifying the input RF signal (e.g., provided by RF circuit 1606); and one or more filters for generating an RF signal for subsequent transmission (e.g., through one or more antennas in one or more antennas 1610).

[0110] In some implementations, the PMC 1612 manages the power supplied to the baseband circuitry 1604. Specifically, the PMC 1612 controls power selection, voltage scaling, battery charging, or DC-DC conversion. The PMC 1612 is typically included when the device 1600 can be battery powered, for example, when the device is included in a UE. The PMC 1612 can improve power conversion efficiency while providing the desired implementation size and thermal characteristics.

[0111] Although Figure 16 The PMC 1612 is shown coupled only to the baseband circuit 1604. However, in other specific implementations, the PMC 1612 may be additionally or alternatively coupled to other components, such as, but not limited to, the application circuit 1602, the RF circuit 1606, or the FEM 1608, and perform similar power management operations.

[0112] In some implementations, the PMC 1612 can be controlled or otherwise integrated into various power-saving mechanisms of the device 1600. For example, if the device 1600 is in the RRC_Connected state, where it remains connected to the RAN node because it anticipates receiving traffic soon, it can enter a state known as Discontinuous Receive Mode (DRX) after a period of inactivity. During this state, the device 1600 can be powered down for short intervals, thereby saving power.

[0113] If no data traffic activity persists for an extended period, device 1600 may transition to the RRC_Idle state, in which the device disconnects from the network and does not perform operations such as channel quality feedback or handover. Device 1600 enters a very low power state and performs paging, during which the device periodically wakes up again to listen to the network and then powers off again. Device 1600 may not receive data in this state; to receive data, the device may transition back to the RRC_Connected state.

[0114] An additional power-saving mode allows the device to be unavailable from the network for periods exceeding the paging interval (ranging from seconds to hours). During this time, the device is completely unconnected to the network and can be completely powered off. Any data transmitted during this period will incur significant latency, which is assumed to be acceptable.

[0115] The processor of application circuit 1602 and the processor of baseband circuit 1604 can be used to execute elements of one or more instances of the protocol stack. For example, the processor of baseband circuit 1604 can be used alone or in combination to execute layer 3, layer 2, or layer 1 functionality, while the processor of baseband circuit 1604 can utilize data received from these layers (e.g., packet data) and further execute layer 4 functionality (e.g., transmit communication protocol (TCP) and user datagram protocol (UDP) layers). As mentioned herein, layer 3 may include the RRC layer, which will be described in further detail below. As mentioned herein, layer 2 may include the Media Access Control (MAC) layer, the Radio Link Control (RLC) layer, and the Packet Data Convergence Protocol (PDCP) layer, which will be described in further detail below. As mentioned herein, layer 1 may include the physical (PHY) layer of the UE / RAN node, which will be described in further detail below.

[0116] Figure 17 This is a diagram illustrating an example interface of a baseband circuit based on one or more specific implementations described herein. As discussed above, Figure 16 The baseband circuit 1604 may include processors 1604A to 1604E and a memory 1604G utilized by the processors. Each of the processors 1604A to 1604E may respectively include memory interfaces 1704A to 1704E for transferring / receiving data to / from the memory 1604G. The baseband circuit 1604 or one or more baseband processors or control logic components of the baseband circuit 1604 may be independently of UE 101 or base station 111 and perform signaling and operations as described throughout this disclosure.

[0117] The baseband circuit 1604 may also include one or more interfaces for communicatively coupling to other circuits / devices, such as a memory interface 1712 (e.g., an interface for transferring / receiving data to / from a memory external to the baseband circuit 1604) and an application circuit interface 1714 (e.g., an interface for transferring / receiving data to / from a memory external to the baseband circuit 1604)... Figure 16 Application circuit 1602 is an interface for transmitting / receiving data), and RF circuit interface 1716 (e.g., for transmitting / receiving data to / from...). Figure 16 The RF circuit 1606 is an interface for transmitting / receiving data, and the wireless hardware connection interface 1718 is used for transmitting / receiving data to / from near field communication (NFC) components, Bluetooth, etc. ® Components (e.g., Bluetooth)® Low power consumption, Wi-Fi ® Interfaces for transmitting / receiving data to / from components and other communication components) and power management interface 1720 (e.g., an interface for transmitting / receiving power or control signals to / from PMC 1612).

[0118] Embodiments herein may include subjects such as methods, components for performing actions or blocks of the method, including at least one machine-readable medium containing executable instructions that, when executed by a machine (e.g., a processor with memory, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), etc.), cause the machine to perform actions of a method or apparatus or system for concurrent communication using various communication technologies according to the specific implementations and embodiments described.

[0119] Example 1 is a baseband processor for a first user equipment (UE). The baseband processor is configured to cause the first UE to perform the following operations when executing instructions stored in one or more memories: receive congestion control information for sidelink positioning reference signal (SL-PRS) communication; determine resources for transmitting a first SL-PRS to a second UE; perform congestion processing based on the congestion control information for SL-PRS communication; and transmit the SL-PRS to the second UE after performing the congestion processing.

[0120] Example 2 is a baseband processor that includes the subject matter according to Example 1, wherein the congestion processing is further based on the SL-PRS channel occupancy rate (CR) and / or SL-PRS channel busy rate (CBR) for the first SL-PRS, and wherein the SL-PRS CR or the SL-PRS CBR is evaluated separately for the shared resource pool and the dedicated resource pool.

[0121] Example 3 is a baseband processor that includes the subject matter according to Example 2, wherein the SL-PRS CR or the SL-PRS CBR is evaluated by normalizing the size of time and frequency resources.

[0122] Example 4 is a baseband processor that includes the subject matter according to Example 2, wherein the SL-PRS CR or the SL-PRS CBR is evaluated using a time window that is implemented separately from the time window of the CR or CBR used for sidelink communication.

[0123] Example 5 is a baseband processor that includes the subject matter according to Example 2, wherein the SL-PRS CR or the SL-PRS CBR is in a time slot. nAmong those assessed, n Prior to the first time slot determined for transmitting the first SL-PRS m Congestion control processing time N And the congestion control processing time mentioned therein N It is the congestion control processing time for communication with the side link. N’ UE capabilities implemented separately.

[0124] Example 6 is a baseband processor that includes the subject matter according to Example 1, wherein the congestion control information includes an SL-PRS channel occupancy (CR) limit, and wherein the congestion processing includes modifying parameters of the resource when the SL-PRS CR of the first SL-PRS exceeds the SL-PRS CR limit.

[0125] Example 7 is a baseband processor that includes the subject matter according to Example 6, wherein the SL-PRS CR limit is associated with a priority level assigned to a first SL-PRS, and wherein the SL-PRS CR of the first SL-PRS is the sum of all SL-PRS CRs evaluated in slot n associated with a priority level lower than the priority level assigned to the first SL-PRS.

[0126] Example 8 is a baseband processor that includes the subject matter according to Example 6, wherein the SL-PRS CR of the first SL-PRS is in a time slot. n The sum of all SL-PRS CRs evaluated in the middle, where n Prior to the first time slot determined for transmitting the first SL-PRS m Congestion control processing time N .

[0127] Example 9 is a baseband processor that includes the subject matter according to Example 6, wherein modifying the parameters of the resources includes one or more of the following: increasing the comb size, reducing time resources or frequency resources, or reducing the retransmission amount of the first SL-PRS.

[0128] Example 10 is a baseband processor that includes the subject matter according to Example 1, wherein the congestion control information includes a channel busy rate (CBR) threshold, and wherein the congestion handling includes modifying parameters or stopping transmission of the first SL-PRS if the CBR of the first SL-PRS exceeds the CBR threshold.

[0129] Example 11 is a baseband processor for reserved user equipment (UE). The baseband processor is configured to, when executing instructions stored in one or more memories, cause the reserved UE to receive configuration information for sidelink positioning reference signal (SL-PRS) communication for a target UE, and to send resource selection information to the target UE to indicate the resources available for the target UE to transmit the target SL-PRS.

[0130] Example 12 is a baseband processor that includes the subject matter described in Example 11, wherein the resource selection information includes a time window transmitted on the Physical Side Link Control Channel (PSCCH) within which the target SL-PRS is scheduled.

[0131] Example 13 is a baseband processor that includes the subject matter according to Example 11, wherein the resources for transmitting the target SL-PRS are sensed and selected by the reserved UE, and are transmitted to the target UE selection using up to two scheduled retransmissions.

[0132] Example 14 is a baseband processor that includes the subject matter according to Example 13, wherein the resources for transmitting the target SL-PRS are prioritized by being marked or set to have a high priority level.

[0133] Example 15 is a baseband processor that includes the subject matter according to Example 11, wherein the resource selection information is transmitted to the target UE on the Physical Side Link Shared Channel (PSSCH), and the resource for transmitting the target SL-PRS is indicated by MAC-CE.

[0134] Example 16 is a baseband processor that includes the subject matter described in Example 11, and the baseband processor is further configured to cause the reserved UE to also send a first SL-PRS to the target UE on the PSSCH.

[0135] Example 17 is a baseband processor that includes the subject matter described in Example 11, the baseband processor being further configured to enable the reserved UE to receive the target SL-PRS from the target UE and measure the target SL-PRS.

[0136] Example 18 is a baseband processor that includes the subject matter according to Example 11, wherein the resources include a (pre)configured number of sub-time slots, wherein the size of the symbols of the sub-time slots is predefined.

[0137] Example 19 is a baseband processor that includes the subject matter according to Example 11, wherein the resources include a (pre-configured) number of sub-channels, and the size of the resources.

[0138] Example 20 is a method for resource allocation by a first user equipment (UE). The method includes: receiving from an auxiliary UE inter-UE coordination information for allocating resources for transmitting a sidelink positioning reference signal (SL-PRS); determining resources for transmitting the SL-PRS from a dedicated resource pool based on the inter-UE coordination information; and transmitting the SL-PRS using the resources determined from the dedicated resource pool. A physical sidelink shared channel (PSSCH) or a physical sidelink feedback channel (PSFCH) is configured to convey the inter-UE coordination information.

[0139] Example 21 is a baseband processor that includes the subject matter according to Example 20, wherein the PSSCH or the PSFCH is configured in the dedicated resource pool to transmit the inter-UE coordination information.

[0140] Example 22 is a baseband processor that includes the subject matter according to Example 20, wherein a dedicated pool resource in a dedicated resource pool is configured with a specific shared pool resource in a shared resource pool for transmitting the inter-UE coordination information.

[0141] Example 23 is a baseband processor that includes the subject matter described in Example 20, wherein the inter-UE coordination information is sent on the PSSCH and / or the PSFCH when resources are acquired in a shared resource pool.

[0142] Example 24 is a baseband processor that includes the subject matter according to Example 20, wherein the inter-UE coordination information is transmitted on the PSSCH and indicates SL-PRS resources reserved by another UE.

[0143] Example 25 is a baseband processor that includes the subject matter described in Example 20, further comprising: transmitting a resource reservation of the first UE to the auxiliary UE on the PSCCH. The inter-UE coordination information is transmitted on the Physical Side Link Feedback Channel (PSFCH) and indicates a potential SL-PRS resource conflict between the resource reservation of the first UE and a resource reservation of another UE that was not directly received by the first UE.

[0144] Example 26 is a method that includes any action or combination of actions as substantially described herein in the detailed description.

[0145] Example 27 is a method, which is substantially described herein with reference to each or any combination of the accompanying drawings included herein or with reference to each or any combination of the paragraphs in the detailed description.

[0146] Example 28 is a user equipment configured to perform any action or combination of actions as substantially described herein in specific embodiments included in the user equipment.

[0147] Example 29 is a network node configured to perform any action or combination of actions as substantially described herein in the specific embodiments included in the network node.

[0148] Example 30 is a non-volatile computer-readable medium that stores instructions that, when executed, cause to perform any action or combination of actions as substantially described herein in the detailed embodiments.

[0149] Example 31 is a baseband processor for a user equipment, the baseband processor being configured to perform any action or combination of actions as substantially described herein in specific embodiments included in the user equipment.

[0150] Example 32 is a baseband processor for a network node, the baseband processor being configured to perform any action or combination of actions as substantially described herein in specific embodiments, such as those included in the user equipment.

[0151] The foregoing description of exemplary examples, embodiments, aspects, etc., of the subject matter of this disclosure, including those described in the specification summary, is not intended to be exhaustive or to limit the disclosed aspects to their precise forms. While specific examples, embodiments, aspects, etc., have been described herein for illustrative purposes, various modifications may be contemplated within the scope of such examples, embodiments, aspects, etc., as will be appreciated by those skilled in the art.

[0152] In this regard, although the subject matter of this disclosure has been described in conjunction with various examples, embodiments, aspects, and corresponding drawings, it should be understood, where applicable, that other similar aspects may be used or modifications and additions may be made to the disclosed subject matter to perform the same, similar, alternative, or substitute functions without departing from the disclosed subject matter. Therefore, the disclosed subject matter should not be limited to any single example, embodiment, or aspect described herein, but should be interpreted in accordance with the breadth and scope of the following appended claims.

[0153] In particular, regarding the various functions performed by the aforementioned components or structures (assemblies, devices, circuits, systems, etc.), unless otherwise stated, the terminology used to describe such components (including references to "part") is intended to correspond to any component or structure that performs the specified functions of the described component (e.g., functionally equivalent), even if it is not structurally equivalent to the disclosed structure that performs the functions in the exemplary embodiments illustrated herein. Furthermore, while certain features have been disclosed with respect to only one of the plurality of embodiments, it may be desirable and advantageous for any given or particular application to combine such features with one or more other features of other embodiments.

[0154] As is widely recognized, the use of personally identifiable information should comply with privacy policies and practices that are generally accepted to meet or exceed industry or governmental requirements for protecting user privacy. Specifically, personally identifiable information data should be managed and processed to minimize the risk of unintentional or unauthorized access or use, and the nature of authorized use should be clearly explained to users.

Claims

1. A baseband processor for a first user equipment (UE), the baseband processor being configured to perform operations when executing instructions stored in one or more memories, the operations including: Decode congestion control information used for side link positioning reference signal (SL-PRS) communication; Determine the resources to be used to send SL-PRS to the second UE; Perform congestion handling operations based on the congestion control information; and The encoding is used to send the SL-PRS to the second UE on the resource after the congestion handling operation is performed.

2. The baseband processor according to claim 1, The congestion handling is further based on the SL-PRS channel occupancy rate (CR) and / or SL-PRS channel busy rate (CBR); and The SL-PRS CR or SL-PRS CBR is evaluated separately for the shared resource pool and the dedicated resource pool.

3. The baseband processor of claim 2, wherein the SL-PRS CR or the SL-PRS CBR is evaluated by normalizing the resource size based on the amount of resources allocated or configured for the SL-PRS communication.

4. The baseband processor of claim 2, wherein the SL-PRS CR or the SL-PRS CBR is evaluated using a time window configured separately from the time window of the CR or CBR used for sidelink communication.

5. The baseband processor according to claim 2, The SL-PRS CR or the SL-PRS CBR is in the time slot. n Among those assessed, n Prior to the first time slot determined for transmitting the SL-PRS m Congestion control processing time N ,and The congestion control processing time mentioned above N It is the congestion control processing time for communication with the side link. N’ UE capabilities implemented separately.

6. The baseband processor of claim 1, wherein the congestion handling includes one or more of the following: reducing the retransmission amount of the SL-PRS, reducing the transmit power of the SL-PRS, or increasing the comb size or reducing the amount of resources used for the SL-PRS.

7. The baseband processor according to claim 1, The congestion control information mentioned therein includes multiple SL-PRS channel occupancy (CR) limits, and The multiple SL-PRS CR restrictions are (pre) configured to be associated with a series of priority levels in the resource pool, respectively.

8. The baseband processor according to claim 7, wherein the SL-PRS CR of the SL-PRS is in a time slot. n The sum of all SL-PRS CRs evaluated in the middle, where n Prior to the first time slot determined for transmitting the SL-PRS m Congestion control processing time N .

9. The baseband processor of claim 7, wherein the SL-PRS CR of the SL-PRS is the sum of all SL-PRS CRs evaluated in slot n associated with a priority level lower than that assigned to the SL-PRS.

10. The baseband processor according to claim 1, The congestion control information mentioned therein includes a channel busy rate (CBR) threshold; and The congestion handling includes modifying parameters or stopping the transmission of the SL-PRS if the CBR of the SL-PRS exceeds the CBR threshold.

11. A baseband processor for reserving user equipment (UE), the baseband processor being configured to cause the reserved UE to: when executing instructions stored in one or more memories. Receive configuration information for side-link positioning reference signal (SL-PRS) communication for the target UE; and Based on the configuration information, resource selection information is sent to the target UE to indicate the resources available for the target UE to send the target SL-PRS.

12. The baseband processor of claim 11, wherein the resource selection information includes a time window transmitted on the physical side link control channel (PSCCH), within which the target SL-PRS is scheduled.

13. The baseband processor of claim 11, wherein the resources for transmitting the target SL-PRS are sensed and selected by the reserved UE, and transmitted to the target UE using up to two scheduled retransmissions.

14. The baseband processor of claim 13, wherein the resources for transmitting the target SL-PRS are prioritized by being marked or set to have a high priority level.

15. The baseband processor according to claim 11, The resource selection information is transmitted to the target UE on the Physical Side Link Shared Channel (PSSCH); and The resource used to send the target SL-PRS is indicated by MAC-CE.

16. The baseband processor of claim 15, wherein the baseband processor is further configured to cause the reserved UE to also send SL-PRS to the target UE on the PSSCH.

17. The baseband processor of claim 11, wherein the baseband processor is further configured to cause the reserved UE to receive the target SL-PRS from the target UE and to measure the target SL-PRS.

18. The baseband processor of claim 11, wherein the resources include a (pre)configured number of sub-time slots, wherein the size of the symbols used for the sub-time slots is predefined.

19. The baseband processor of claim 11, wherein the resources include a (pre)configured number of subchannels, wherein the size of the resource blocks (RBs) for the subchannels is predefined.

20. A method for resource allocation by a first user equipment (UE), the method comprising: Receive inter-UE coordination information from the auxiliary UE for allocating resources for transmitting sidelink positioning reference signals (SL-PRS); Based on the inter-UE coordination information, resources for transmitting the SL-PRS are determined from the dedicated resource pool; and The SL-PRS is sent using the resources determined from the dedicated resource pool; The Physical Side Link Shared Channel (PSSCH) or Physical Side Link Feedback Channel (PSFCH) is configured to convey the coordination information between the UEs.

21. The method of claim 20, wherein the PSSCH or the PSFCH is configured in the dedicated resource pool to transmit the inter-UE coordination information.

22. The method of claim 20, wherein the dedicated pool resources in the dedicated resource pool are configured with specific shared pool resources in the shared resource pool for transmitting the inter-UE coordination information.

23. The method of claim 20, wherein the inter-UE coordination information is sent on the PSSCH and / or the PSFCH when resources are acquired in the shared resource pool.

24. The method of claim 20, wherein the inter-UE coordination information is transmitted on the PSSCH and indicates SL-PRS resources reserved by another UE.

25. The method according to claim 20, further comprising: Send the resource reservation for the first UE to the auxiliary UE on the PSCCH; as well as The UE-to-UE coordination information is transmitted on the Physical Side Link Feedback Channel (PSFCH) and indicates a potential SL-PRS resource conflict between the resource reservation of the first UE and the resource reservation of another UE that was not directly received by the first UE.

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