Patent Application
20250056484
The examples and non-limiting example embodiments relate generally to communications and, more particularly, to configuration of a sidelink positioning reference signal (SL PRS) when the transmission of the SL PRS is dynamically triggered by lower layer signaling.
It is known to estimate the position of a communication device in a communication network.
The foregoing aspects and other features are explained in the following description, taken in connection with the accompanying drawings.
The methods described herein address an open problem in sidelink (SL) positioning in 5G New Radio (NR), in particular on question how to select the SL PRS configuration when the SL PRS request is triggered by lower layer (e.g. via SCI or SL PRS).
Prior to this, 3GPP RAN conducted a study on “Scenarios and requirements of in-coverage, partial coverage, and out-of-coverage NR positioning use cases” in Release-17 focused on V2X and public safety use cases with the outcome being captured in TR38.845. Additionally, SAI has developed requirements in TS22.261 for “Ranging based services”, and has developed positioning accuracy requirements in TS22.104 for IIoT use cases in out-of-coverage scenarios.
In Table 7.3.2.2-1, TS22.261 lists the performance requirements for different positioning service levels. It is noted that, along with horizontal and vertical accuracy requirements, the requirements on positioning service availability and positioning service latency are particularly very stringent for positioning service levels 4 (99.9% availability and 15 ms latency) and 6 (99.9% availability and 10 ms latency). The examples of scenarios/use cases of positioning service levels 4 and 6 include (1-2):
1. V2X, set-2 and set-3 use cases [TR38.845]: This corresponds to, in RP-210040, ‘Group 2: Lane level positioning requirement’ use cases such as vehicle platooning, cooperative lane merge, lane change warning, emergency break warning, intersection movement assist, etc., and ‘Group 3: Below meter positioning requirement’ use cases such as high definition sensor sharing, vulnerable road user (VUR)—collision risk warning, cooperative manoeuvers in emergency situations, real-time situation awareness and high-definition maps, etc.
2. IIoT [TS22.104]: Factories of the Future scenarios such as augmented reality in smart factories, mobile control panels with safety functions in smart factories (within factory danger zones), inbound logistics for manufacturing (for driving trajectories (if supported by further sensors like camera, GNSS, IMU) of indoor autonomous driving systems)).
The following is a list of related terminologies [TR 38.859].
Target UE: UE to be positioned (in this context, using SL, i.e., PC5 interface).
Anchor UE: UE supporting positioning of target UE, e.g., by transmitting and/or receiving reference signals for positioning, providing positioning-related information, etc., over the SL interface.
Sidelink positioning: Positioning UE using reference signals transmitted over SL, i.e., PC5 interface, to obtain absolute position, relative position, or ranging information.
Ranging: Determination of the distance and/or the direction between a UE and another entity, e.g., anchor UE.
Sidelink positioning reference signal (SL PRS): Reference signal transmitted over SL for positioning purposes.
SL PRS (pre-) configuration: (Pre-) configured parameters of SL PRS such as time-frequency resources (other parameters are not precluded) including its bandwidth and periodicity.
SL positioning is based on the transmissions of SL PRS by multiple anchor UEs to be received by a target UE in e.g. SL TDOA methods or SL PRS exchange between the anchor(s) and target UEs in e.g. SL (multi-) RTT method to enable localization of the target UE and/or ranging of target UE with respect to a reference UE (e.g. anchor UE) within precise latency and accuracy requirements of the corresponding SL positioning.
A UE can trigger another UE via SCI for SL PRS transmission. The examples described herein address several open problems, including regarding the triggering of SL-PRS, supporting UE-A to request UE-B to transmit SL-PRS via lower layer signaling sent by UE-A, confirming the related WA for shared and dedicated resource pools, and regarding the lower-layer signaling, supporting SCI associated with SL-PRS transmission.
SL positioning is based on the SL-PRS exchange between an initiator UE (e.g. target UE) and responding UE (e.g. anchor UE) in RTT-based methods. Here, a SL PRS transmission at a responding UE (e.g. anchor UE in first stage of SL RTT) can be triggered by the initiator UE (e.g. target UE in first stage of SL RTT) to have PRS exchange between the UEs. Note that RANI has agreed that the SL PRS transmission at a UE can be triggered by either its own higher layer (including higher layer request from the initiator UE) or it can be trigger from lower layer signaling (e.g. SCI) from another UE (e.g. initiator UE).
SL PRS configuration (bandwidth, frequency offset, comb, etc.) is key factor that directly impacts the achievable positioning performance. In scenarios particularly where lower layer signaling-based triggering of SL PRS transmission is employed, the responding UE may not be aware of the desired SL PRS configuration to support the positioning at initiator UE. Because the lower layer trigger signaling (e.g. SCI or SL PRS) may not contain sufficient information on the desired configuration. So, in case of lower layer-based SL PRS transmission triggering, how a responding UE selects a SL PRS configuration that is most suitable for positioning needs of the initiator UE is a key open question. The IR addresses this open question.
The examples described herein are based on the observation that if a given SL PRS transmission is used as part of a SL RTT positioning method, then any subsequent SL PRS transmission must exhibit the same or better key parameters in order not to degrade the achievable accuracy of the entire positioning process.
Among the key SL PRS parameters that determine the overall SL positioning accuracy are primarily the SL PRS bandwidth and time span (i.e. number of used symbols) as well as any other parameters determining the SL PRS S(I)NR (e.g., comb pattern, number of repetitions).
The examples described herein therefore generally are based on that in case an SL PRS “response” transmission (e.g. from anchor UE to target UE) is needed upon the reception of an “initial” SL PRS transmission (from target UE to anchor UE), for example as part of a SL RTT positioning method and/or due to the lower layer-based (SCI-based, SL PRS-based) SL PRS transmission trigger, the “response” SL PRS transmission is configured by using the same (or even better) configuration parameters of the “initial” transmission indicated in the associated SCI transmission. The term “better” is to be understood in the sense of improving achievable accuracy, i.e. in terms of better bandwidth and S(I)NR.
In addition, the method described herein specifically address different operational scenarios, including no “response” SL PRS is pre-configured—here, the so-called “PRS mirroring” concept is used, and one or more “response” SL PRSs are configured but not mapped with a particular “initial” SL PRS-here, the so-called “PRS matching” concept is used.
More specifically, the examples described herein are based on the following.
The responding UE is configured (from LMF/server UE/autonomously) to transmit a “response” SL PRS (e.g., based on lower layer signaling-based (e.g. SCI-based) trigger from the “initiating” UE, or pre-configuration) whose configuration is determined in relation to the configuration of the “initial” SL PRS transmitted by the “initiating” UE as follows (Option 0, Option 1, Option 2, Option 3):
Option 0 (“no PRS pre-configured at the “responding” UE”): the configuration of the “response” SL PRS completely or at least partially reuses (“mirrors”) the configuration of the “initial” SL PRS configuration as defined in the associated SCI. Partial mirroring (e.g. the reuse of only bandwidth and comb size parameters) can be configured explicitly by LMF, or as an autonomous (implementation-specific) decision.
Option 1 (“single PRS pre-configured at the “responding” UE”): the configuration of a pre-configured (single) default SL PRS is used for the “responding” SL PRS.
Option 2 (“multiple PRSs pre-configured at the “responding” UE”): the configuration of the “closest” of multiple possible (pre-configured) SL PRSs is used for the “responding” SL PRS whereby the term “closest” is understood in the sense of relevant parameters (e.g., bandwidth or comb size) being the same or better with as little difference (“closeness”) as possible (e.g., to minimize resource usage/overhead).
Option 3 (“PRS mapping pre-configured at the “responding” UE”): the configuration of the “responding” SL PRS is determined based on guidance (e.g. in the form of a mapping between “initial” and “responding” SL PRSs) provided by the LMF/server UE/autonomously.
The initiating UE (e.g. the target UE) exploits the mechanism for determining the “responding” SL PRS configuration (Options 0-3) at the “responding” UE by configuring its own SL PRS transmission (“initiating PRS”) such that the “responding UE” satisfies specific minimum requirement(s). For example, the “initiating” SL PRS itself is characterized by said minimum requirements to that the “responding” SL PRS is forced to maintain them too.
The initiating UE switches to SL PRS transmission mode that employs (higher-layer) pre-configuration at both the “initiating” and “responding” UE if the “responding” SL PRS does not meet the desired minimum requirements. In one example, the “initiating” UE requests session-based positioning with explicit pre-configuration (e.g. using Option 1 for SL PRS configuration). Alternatively, the “initiating” UE requests the “responding UE to switch between options for determining the configuration of “responding” SL PRS.
The initiating UE is given an indication by the LMF/server UE how the SL PRS configuration will be determined at the “responding” UE (i.e., which Option(s) 0-3 are used).
The devices and methods described herein will be described in more detail using the following examples.
In the first example (see
At 210, the LMF 99 sends Assistance Data which specifies that which Option for SL PRS config determination is used at the anchor UE. Note that anchor UE may also be configured by the LMF on which Option to be used.
At 220, during the “initial” (INIT) SL PRS transmission by the target UE, the SCI “prsTrigger” flag is raised to the value 1 to trigger a “response” SL PRS transmission.
At 230, the anchor UE observes this flag and at 240, responds with its own SL PRS transmission. The configuration of this “responding” (RESP) SL PRS 240, any of the Options 1-3 may be used. For example, the same configuration as used for both INIT 220 and SL PRS “RESP” 240. Then at 250 the SL PRS measurements are sent back to the target UE. Note that, the measurement may also be sent to LMF 99 in case the position computation in performed at the LMF. In this example, target itself is assumed to be performing position computation.
At 260, the target UE may evaluate the quality of the SL PRS “RESP” configuration. If any of the parameters does not meet the expectation (e.g., the bandwidth BW of the SL PRS “RESP” is smaller than the one of the SL PRS “INIT”), then the target UE may request a more specific SL PRS configuration by engaging in SLPP interaction with the anchor UE.
As shown at 230 the anchor UE 10-1 determines the SL PRS configuration parameters based on option 1, option 2 or option 3. For example, SL PRS configuration may be determined based on option 1.
The second example (see
At 320, the SL PRS “INIT” is then transmitted with some required bandwidth BD and comb size as the target UE was made aware by the LMF that the responding anchor UE will match this configuration. At 330, the anchor UE mirrors SL PRS configuration parameters.
The responding SL PRS “RESP” sent at 340 will then be characterized by the required parameters which preserves the achievable positioning set out by the parameters of the initial SL PRS “INIT” 320. No degradation is expected to occur and hence the target UE 10 will have not the need to require a reconfiguration of the positioning session as in the first example.
At 350 an SL PRS measurement is transmitted from the anchor UE 10-1 to the target UE 10.
In an embodiment, the proposed scheme can also be used for DL TDOA-like SL TDOA where a target UE can trigger anchor UEs to transmit SL PRS by sending a SCI-based trigger and performing SL PRS transmission (even though SL PRS transmission is not needed from the target UE) so that the anchor UEs can mirror or match their SL PRS transmission configuration as per the received SL PRS.
The examples described herein target SL positioning, which is a key technology for many use cases including public safety, V2X, and industrial IoT. SL positioning will be standardized in 3GPP Release 18, and it will potentially impact TS 38.355, TS 37.355, etc.
In
The base station 70, as a network element of the cellular network 1, provides the UE 10 access to cellular network 1 and to the data network 91 via the core network 90 (e.g., via a user plane function (UPF) of the core network 90). The base station 70 is illustrated as having one or more antennas 58. In general, the base station 70 is referred to as RAN node 70 herein. An example of a RAN node 70 is a gNB. There are, however, many other examples of RAN nodes including an eNB (LTE base station) or transmission reception point (TRP). The base station 70 includes one or more processors 73, one or more memories 75, and other circuitry 76. The other circuitry 76 includes one or more receivers (Rx(s)) 77 and one or more transmitters (Tx(s)) 78. A program 72 is used to cause the base station 70 to perform the operations described herein.
It is noted that the base station 70 may instead be implemented via other wireless technologies, such as Wi-Fi (a wireless networking protocol that devices use to communicate without direct cable connections). In the case of Wi-Fi, the link 11 could be characterized as a wireless link.
Two or more base stations 70 communicate using, e.g., link(s) 79. The link(s) 79 may be wired or wireless or both and may implement, e.g., an Xn interface for fifth generation (5G), an X2 interface for LTE, or other suitable interface for other standards.
The cellular network 1 may include a core network 90, as a third illustrated element or elements, that may include core network functionality, and which provide connectivity via a link or links 81 with a data network 91, such as a telephone network and/or a data communications network (e.g., the Internet). The core network 90 includes one or more processors 93, one or more memories 95, and other circuitry 96. The other circuitry 96 includes one or more receivers (Rx(s)) 97 and one or more transmitters (Tx(s)) 98. A program 92 is used to cause the core network 90 to perform the operations described herein.
The core network 90 could be a 5GC (5G core network). The core network 90 can implement or comprise multiple network functions (NF(s)) 99, and the program 92 may comprise one or more of the NFs 99. A 5G core network may use hardware such as memory and processors and a virtualization layer. It could be a single standalone computing system, a distributed computing system, or a cloud computing system. The NFs 99, as network elements, of the core network could be containers or virtual machines running on the hardware of the computing system(s) making up the core network 90.
Core network functionality for 5G may include access and mobility management functionality that is provided by a network function 99 such as an access and mobility management function (AMF(s)), session management functionality that is provided by a network function such as a session management function (SMF). Core network functionality for access and mobility management in an LTE network may be provided by an MME (Mobility Management Entity) and/or SGW (Serving Gateway) functionality, which routes data to the data network. Many others are possible, as illustrated by the examples in
In the data network 91, there is a computer-readable medium 94. The computer-readable medium 94 contains instructions that, when downloaded and installed into the memories 15, 75, or 95 of the corresponding UE 10, base station 70, and/or core network element(s) 90, and executed by processor(s) 13, 73, or 93, cause the respective device to perform corresponding actions described herein. The computer-readable medium 94 may be implemented in other forms, such as via a compact disc or memory stick.
The programs 12, 72, and 92 contain instructions stored by corresponding one or more memories 15, 75, or 95. These instructions, when executed by the corresponding one or more processors 13, 73, or 93, cause the corresponding apparatus 10, 70, or 90, to perform the operations described herein. The computer readable memories 15, 75, or 95 may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor-based memory devices, flash memory, firmware, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory. The computer readable memories 15, 75, and 95 may be means for performing storage functions. The processors 13, 73, and 93, may be of any type suitable to the local technical environment, and may include one or more of general-purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on a multi-core processor architecture, as non-limiting examples. The processors 13, 73, and 93 may be means for causing their respective apparatus to perform functions, such as those described herein.
The receivers 17, 77, and 97, and the transmitters 18, 78, and 98 may implement wired or wireless interfaces. The receivers and transmitters may be grouped together as transceivers.
The apparatus 500 includes a display and/or I/O interface 508, which includes user interface (UI) circuitry and elements, that may be used to display aspects or a status of the methods described herein (e.g., as one of the methods is being performed or at a subsequent time), or to receive input from a user such as with using a keypad, camera, touchscreen, touch area, microphone, biometric recognition, one or more sensors, etc. The apparatus 500 includes one or more communication e.g. network (N/W) interfaces (I/F(s)) 510. The communication I/F(s) 510 may be wired and/or wireless and communicate over the Internet/other network(s) via any communication technique including via one or more links 524. The link(s) 524 may be the link(s) 11 and/or 79 and/or 31 and/or 81 from
The transceiver 516 comprises one or more transmitters 518 and one or more receivers 520. The transceiver 516 and/or communication I/F(s) 510 may comprise standard well-known components such as an amplifier, filter, frequency-converter, (de) modulator, and encoder/decoder circuitries and one or more antennas, such as antennas 514 used for communication over wireless link 526.
The control module 506 of the apparatus 500 comprises one of or both parts 506-1 and/or 506-2, which may be implemented in a number of ways. The control module 506 may be implemented in hardware as control module 506-1, such as being implemented as part of the one or more processors 502. The control module 506-1 may be implemented also as an integrated circuit or through other hardware such as a programmable gate array. In another example, the control module 506 may be implemented as control module 506-2, which is implemented as computer program code (having corresponding instructions) 505 and is executed by the one or more processors 502. For instance, the one or more memories 504 store instructions that, when executed by the one or more processors 502, cause the apparatus 500 to perform one or more of the operations as described herein. Furthermore, the one or more processors 502, the one or more memories 504, and example algorithms (e.g., as flowcharts and/or signaling diagrams), encoded as instructions, programs, or code, are means for causing performance of the operations described herein.
The apparatus 500 to implement the functionality of control 506 may be UE 10, base station 70 (e.g. gNB 70), or core network 90 including any of the network functions 99 such as LMF 99, which network functions 99 may be implemented with a network entity. Thus, processor 502 may correspond to processor(s) 13, processor(s) 73 and/or processor(s) 93, memory 504 may correspond to one or more memories 15, one or more memories 75 and/or one or more memories 95, computer program code 505 may correspond to program 12, program 72, or program 92, communication I/F(s) 510 and/or transceiver 516 may correspond to other circuitry 16, other circuitry 76, or other circuitry 96, and antennas 514 may correspond to antennas 28 or antennas 58.
Alternatively, apparatus 500 and its elements may not correspond to either of UE 10, base station 70, or core network and their respective elements, as apparatus 500 may be part of a self-organizing/optimizing network (SON) node or other node, such as a node in a cloud.
Apparatus 500 may correspond to anchor UE 10-1, anchor UE 10-2, or anchor UE 10-3. The anchor UEs (10-1, 10-2, 10-3) may be configured similarly to UE 10 as shown in
The apparatus 500 may also be distributed throughout the network (e.g. 91) including within and between apparatus 500 and any network element (such as core network 90 and/or the base station 70 and/or the UE 10).
Interface 512 enables data communication and signaling between the various items of apparatus 500, as shown in
The following examples are provided and described herein.
Example 1. An apparatus including: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to: receive, from a user equipment, a request for a transmission of a response sidelink positioning reference signal; receive, from the user equipment, an initial sidelink positioning reference signal; determine a configuration of the response sidelink positioning reference signal, at least partially based on a configuration of the initial sidelink positioning reference signal; and transmit, to the user equipment, the response sidelink positioning reference signal.
Example 2. The apparatus of example 1, wherein a parameter of the configuration of the response sidelink positioning reference signal and a parameter of the configuration of the initial sidelink positioning reference signal relate to at least one of: bandwidth, comb size, or a number of symbols.
Example 3. The apparatus of any of examples 1 to 2, wherein the instructions, when executed by the at least one processor, cause the apparatus at least to: determine the configuration of the response sidelink positioning reference signal to at least partially reuse the configuration of the initial sidelink positioning reference signal.
Example 4. The apparatus of any of examples 1 to 3, wherein the instructions, when executed by the at least one processor, cause the apparatus at least to: determine the configuration of the response sidelink positioning reference signal based on a configuration of a preconfigured or configured sidelink positioning reference signal.
Example 5. The apparatus of example 4, wherein the instructions, when executed by the at least one processor, cause the apparatus at least to: receive, from a location management function or a server user equipment, the configured sidelink positioning reference signal.
Example 6. The apparatus of any of examples 1 to 5, wherein the instructions, when executed by the at least one processor, cause the apparatus at least to: select a configuration of a preconfigured or configured sidelink positioning reference signal from multiple configurations of respective multiple preconfigured or configured sidelink positioning reference signals; wherein the selected configuration of the preconfigured or configured sidelink positioning reference signal is associated with at least one parameter or combination of parameters having a value that is closer to at least one parameter or combination of parameters associated with the configuration of the initial sidelink positioning reference signal than a respective at least one parameter or combination of parameters associated with a respective other configuration of another preconfigured or configured sidelink positioning reference signal; and determine the configuration of the response sidelink positioning reference signal to comprise the selected configuration of the preconfigured or configured sidelink positioning reference signal.
Example 7. The apparatus of any of examples 1 to 6, wherein the instructions, when executed by the at least one processor, cause the apparatus at least to: determine the configuration of the response sidelink positioning reference signal based on at least one mapping between a mapped configuration of an initial sidelink positioning reference signal and a respective mapped configuration of a responding sidelink positioning reference signal.
Example 8. The apparatus of example 7, wherein the instructions, when executed by the at least one processor, cause the apparatus at least to: receive the at least one mapping from a location management function or a server user equipment.
Example 9. The apparatus of any of examples 1 to 8, wherein the instructions, when executed by the at least one processor, cause the apparatus at least to: receive, from the user equipment, a request to transmit another response sidelink positioning reference signal based on another configuration of the another response sidelink positioning reference signal, when at least one parameter of the configuration of the response sidelink positioning reference signal does not meet at least one expectation.
Example 10. The apparatus of example 9, wherein the at least one expectation comprises a bandwidth of the configuration of the response sidelink positioning reference being smaller than a bandwidth of the configuration of the initial sidelink positioning reference signal.
Example 11. The apparatus of any of examples 1 to 10, wherein the instructions, when executed by the at least one processor, cause the apparatus at least to: receive, from the user equipment, at least one parameter of the configuration of the initial sidelink positioning reference signal; and determine at least one parameter of the configuration of the response sidelink positioning to be within a threshold value of the at least one parameter of the configuration of the initial sidelink positioning reference signal.
Example 12. The apparatus of any of examples 1 to 11, wherein the request for the transmission of the response sidelink positioning reference signal is based on lower layer signaling.
Example 13. The apparatus of example 12, wherein the lower layer signaling comprises sidelink control information or the initial sidelink positioning reference signal.
Example 14. An apparatus including: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to: determine a configuration of an initial sidelink positioning reference signal; transmit, to a user equipment, an initial sidelink positioning reference signal based on the configuration of the initial sidelink positioning reference signal; transmit, to the user equipment, a request for a transmission of a response sidelink positioning reference signal; receive, from the user equipment, the response sidelink positioning reference signal based on a configuration of the response sidelink positioning reference signal; wherein the configuration of the response sidelink positioning reference signal is based at least partially on the configuration of the initial sidelink positioning reference signal; and estimate a position of the apparatus, based on the response sidelink positioning reference signal.
Example 15. The apparatus of example 14, wherein a parameter of the configuration of the response sidelink positioning reference signal and a parameter of the configuration of the initial sidelink positioning reference signal relate to at least one of: bandwidth, or comb size, or a number of symbols.
Example 16. The apparatus of any of examples 14 to 15, wherein the configuration of the response sidelink positioning reference signal at least partially reuses the configuration of the initial sidelink positioning reference signal.
Example 17. The apparatus of any of examples 14 to 16, wherein the configuration of the response sidelink positioning reference signal is based on a configuration of a preconfigured or configured sidelink positioning reference signal.
Example 18. The apparatus of example 17, wherein the configured sidelink positioning reference signal is provided by a location management function or a server user equipment.
Example 19. The apparatus of any of examples 14 to 18, wherein the configuration of the response sidelink positioning reference signal comprises a configuration of a preconfigured or configured sidelink positioning reference signal, and is associated with at least one parameter or combination of parameters having a value that is closer to at least one parameter or combination of parameters associated with the configuration of the initial sidelink positioning reference signal than a respective at least one parameter or combination of parameters associated with a respective other configuration of another preconfigured or configured sidelink positioning reference signal.
Example 20. The apparatus of any of examples 14 to 19, wherein the configuration of the response sidelink positioning reference signal is based on at least one mapping between a mapped configuration of an initial sidelink positioning reference signal and a respective mapped configuration of a responding sidelink positioning reference signal.
Example 21. The apparatus of any of examples 14 to 20, wherein the instructions, when executed by the at least one processor, cause the apparatus at least to: receive, from a location management function or a server user equipment, an indication of a method the user equipment uses to determine the configuration of the response sidelink positioning reference signal; and determine the configuration of the initial sidelink positioning reference signal based on the indication of the method the user equipment uses to determine the configuration of the response sidelink positioning reference signal received from the location management function or the server user equipment.
Example 22. The apparatus of any of examples 14 to 21, wherein the instructions, when executed by the at least one processor, cause the apparatus at least to: determine whether at least one parameter of the configuration of the response sidelink positioning reference signal meets at least one expectation; and transmit, to the user equipment, a request to transmit another response sidelink positioning reference signal based on another configuration of the another response sidelink positioning reference signal, in response to the at least one parameter of the configuration of the response sidelink positioning reference signal not meeting the at least one expectation.
Example 23. The apparatus of example 22, wherein the at least one expectation comprises a bandwidth of the configuration of the response sidelink positioning reference being smaller than a bandwidth of the configuration of the initial sidelink positioning reference signal.
Example 24. The apparatus of any of examples 14 to 23, wherein the instructions, when executed by the at least one processor, cause the apparatus at least to: receive, from a network entity, an indication that the configuration of the response sidelink positioning reference signal at least partially reuses the configuration of the initial sidelink positioning reference signal; and determine at least one parameter of the configuration of the initial sidelink positioning reference signal, based on the indication received from the network entity that the configuration of the response sidelink positioning reference signal at least partially reuses the configuration of the initial sidelink positioning reference signal.
Example 25. The apparatus of any of examples 14 to 24, wherein the request for the transmission of the response sidelink positioning reference signal is based on lower layer signaling.
Example 26. The apparatus of example 25, wherein the lower layer signaling comprises sidelink control information or the initial sidelink positioning reference signal.
Example 27. An apparatus including: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to: transmit, to a user equipment, assistance information configured to be used with the user equipment to determine a configuration of an initial sidelink positioning reference signal; and transmit, to the user equipment, an indication that a configuration of a response sidelink positioning reference signal transmitted by another user equipment in response to the initial sidelink positioning reference signal at least partially reuses the configuration of the initial sidelink positioning reference signal.
Example 28. The apparatus of example 27, wherein the instructions, when executed by the at least one processor, cause the apparatus at least to: transmit, to the user equipment, an indication of a method the another user equipment uses to determine the configuration of the response sidelink positioning reference signal.
Example 29. The apparatus of any of examples 27 to 28, wherein the instructions, when executed by the at least one processor, cause the apparatus at least to: transmit, to the another user equipment, at least one mapping between a mapped configuration of an initial sidelink positioning reference signal and a respective mapped configuration of a responding sidelink positioning reference signals; wherein the at least one mapping is configured to be used with the another user equipment to determine the configuration of the response sidelink positioning reference signal.
Example 30. The apparatus of any of examples 27 to 29, wherein the instructions, when executed by the at least one processor, cause the apparatus at least to: receive, from the another user equipment, at least one measurement based on the initial sidelink positioning reference signal; and determine a location of the user equipment, based on the at least one measurement.
Example 31. The apparatus of any of examples 27 to 30, wherein the apparatus comprises a location management function or a server user equipment.
Example 32. The apparatus of any of examples 27 to 31, wherein the instructions, when executed by the at least one processor, cause the apparatus at least to: transmit, to the another user equipment, a configured sidelink positioning reference signal; wherein the configuration of the response sidelink positioning reference signal transmitted by another user equipment is based on the configured sidelink positioning reference signal transmitted to the another user equipment.
Example 33. A method including: receiving, from a user equipment, a request for a transmission of a response sidelink positioning reference signal; receiving, from the user equipment, an initial sidelink positioning reference signal; determining a configuration of the response sidelink positioning reference signal, at least partially based on a configuration of the initial sidelink positioning reference signal; and transmitting, to the user equipment, the response sidelink positioning reference signal.
Example 34. A method including: determining a configuration of an initial sidelink positioning reference signal; transmitting, to a user equipment, an initial sidelink positioning reference signal based on the configuration of the initial sidelink positioning reference signal; transmitting, to the user equipment, a request for a transmission of a response sidelink positioning reference signal; receiving, from the user equipment, the response sidelink positioning reference signal based on a configuration of the response sidelink positioning reference signal; wherein the configuration of the response sidelink positioning reference signal is based at least partially on the configuration of the initial sidelink positioning reference signal; and estimating a position of the apparatus, based on the response sidelink positioning reference signal.
Example 35. A method including: transmitting, to a user equipment, assistance information configured to be used with the user equipment to determine a configuration of an initial sidelink positioning reference signal; and transmitting, to the user equipment, an indication that a configuration of a response sidelink positioning reference signal transmitted by another user equipment in response to the initial sidelink positioning reference signal at least partially reuses the configuration of the initial sidelink positioning reference signal.
Example 36. An apparatus including: means for receiving, from a user equipment, a request for a transmission of a response sidelink positioning reference signal; means for receiving, from the user equipment, an initial sidelink positioning reference signal; means for determining a configuration of the response sidelink positioning reference signal, at least partially based on a configuration of the initial sidelink positioning reference signal; and means for transmitting, to the user equipment, the response sidelink positioning reference signal.
Example 37. An apparatus including: means for determining a configuration of an initial sidelink positioning reference signal; means for transmitting, to a user equipment, an initial sidelink positioning reference signal based on the configuration of the initial sidelink positioning reference signal; means for transmitting, to the user equipment, a request for a transmission of a response sidelink positioning reference signal; means for receiving, from the user equipment, the response sidelink positioning reference signal based on a configuration of the response sidelink positioning reference signal; wherein the configuration of the response sidelink positioning reference signal is based at least partially on the configuration of the initial sidelink positioning reference signal; and means for estimating a position of the apparatus, based on the response sidelink positioning reference signal.
Example 38. An apparatus including: means for transmitting, to a user equipment, assistance information configured to be used with the user equipment to determine a configuration of an initial sidelink positioning reference signal; and means for transmitting, to the user equipment, an indication that a configuration of a response sidelink positioning reference signal transmitted by another user equipment in response to the initial sidelink positioning reference signal at least partially reuses the configuration of the initial sidelink positioning reference signal.
Example 39. A non-transitory program storage device readable by a machine, tangibly embodying a program of instructions executable by the machine for performing operations, the operations including: receiving, from a user equipment, a request for a transmission of a response sidelink positioning reference signal; receiving, from the user equipment, an initial sidelink positioning reference signal; determining a configuration of the response sidelink positioning reference signal, at least partially based on a configuration of the initial sidelink positioning reference signal; and transmitting, to the user equipment, the response sidelink positioning reference signal.
Example 40. A non-transitory program storage device readable by a machine, tangibly embodying a program of instructions executable by the machine for performing operations, the operations including: determining a configuration of an initial sidelink positioning reference signal; transmitting, to a user equipment, an initial sidelink positioning reference signal based on the configuration of the initial sidelink positioning reference signal; transmitting, to the user equipment, a request for a transmission of a response sidelink positioning reference signal; receiving, from the user equipment, the response sidelink positioning reference signal based on a configuration of the response sidelink positioning reference signal; wherein the configuration of the response sidelink positioning reference signal is based at least partially on the configuration of the initial sidelink positioning reference signal; and estimating a position of the apparatus, based on the response sidelink positioning reference signal.
Example 41. A non-transitory program storage device readable by a machine, tangibly embodying a program of instructions executable by the machine for performing operations, the operations including: transmitting, to a user equipment, assistance information configured to be used with the user equipment to determine a configuration of an initial sidelink positioning reference signal; and transmitting, to the user equipment, an indication that a configuration of a response sidelink positioning reference signal transmitted by another user equipment in response to the initial sidelink positioning reference signal at least partially reuses the configuration of the initial sidelink positioning reference signal.
References to a ‘computer’, ‘processor’, etc. should be understood to encompass not only computers having different architectures such as single/multi-processor architectures and sequential or parallel architectures but also specialized circuits such as field-programmable gate arrays (FPGAs), application specific circuits (ASICs), signal processing devices and other processing circuitry. References to computer program, instructions, code etc. should be understood to encompass software for a programmable processor or firmware such as, for example, the programmable content of a hardware device whether instructions for a processor, or configuration settings for a fixed-function device, gate array or programmable logic device etc.
The memories as described herein may be implemented using any suitable data storage technology, such as semiconductor based memory devices, flash memory, magnetic memory devices and systems, optical memory devices and systems, non-transitory memory, transitory memory, fixed memory and removable memory. The memories may comprise a database for storing data.
As used herein, the term ‘circuitry’ may refer to the following: (a) hardware circuit implementations, such as implementations in analog and/or digital circuitry, and (b) combinations of circuits and software (and/or firmware), such as (as applicable): (i) a combination of processor(s) or (ii) portions of processor(s)/software including digital signal processor(s), software, and memories that work together to cause an apparatus to perform various functions, and (c) circuits, such as a microprocessor(s) or a portion of a microprocessor(s), that require software or firmware for operation, even if the software or firmware is not physically present. As a further example, as used herein, the term ‘circuitry’ would also cover an implementation of merely a processor (or multiple processors) or a portion of a processor and its (or their) accompanying software and/or firmware. The term ‘circuitry’ would also cover, for example and if applicable to the particular element, a baseband integrated circuit or applications processor integrated circuit for a mobile phone or a similar integrated circuit in a server, a cellular network device, or another network device.
It should be understood that the foregoing description is only illustrative. Various alternatives and modifications may be devised by those skilled in the art. For example, features recited in the various dependent claims could be combined with each other in any suitable combination(s). In addition, features from different example embodiments described above could be selectively combined into a new example embodiment. Accordingly, this description is intended to embrace all such alternatives, modifications and variances which fall within the scope of the appended claims.
The following acronyms and abbreviations that may be found in the specification and/or the drawing figures are given as follows (the abbreviations and acronyms may be appended with each other or with other characters using e.g. a dash, hyphen, slash, or number, and may be case insensitive):
| Number | Date | Country | |
|---|---|---|---|
| 63532125 | Aug 2023 | US |
