WO2025030538A1

WO2025030538A1 - Srs resource coordination for lphap positioning

Info

Publication number: WO2025030538A1
Application number: PCT/CN2023/112377
Authority: WO
Inventors: Yan Meng; Tao Tao; Jianguo Liu; Sean Kelley; Hyun-Su Cha; Gilsoo LEE
Original assignee: Nokia Shanghai Bell Co Ltd; Nokia Solutions and Networks Oy; Nokia Technologies Oy
Current assignee: Nokia Shanghai Bell Co Ltd; Nokia Solutions and Networks Oy; Nokia Technologies Oy
Priority date: 2023-08-10
Filing date: 2023-08-10
Publication date: 2025-02-13
Anticipated expiration: 2026-02-10

Abstract

Example embodiments of the present disclosure relate to sounding reference signal (SRS) resource coordination for low-power high-accuracy positioning (LPHAP) positioning. In an aspect, an apparatus determines at least one of a first list of SRS sequence IDs for LPHAP UEs and a second list of SRS sequence IDs for non-LPHAP UEs. Then, the apparatus transmits information indicative of the first list or the second list to at least one base station. According to some embodiments of the present disclosure, the following advantages may be achieved: effectively avoid interference issue among the gNBs by making each gNB uses different SRS sequence; and effectively avoid interference issue between LPHAP UEs and normal UEs by assign the exclusive SRS sequence ID list for LPHAP UEs.

Description

SRS RESOURCE COORDINATION FOR LPHAP POSITIONING

FIELD

Example embodiments of the present disclosure generally relate to the field of communications, and in particular, to an apparatus, a base station, methods, and a computer-readable storage medium for sounding reference signal (SRS) resource coordination for low-power high-accuracy positioning (LPHAP) positioning.

BACKGROUND

In the fifth-generation new radio (e.g., 5G NR) network, the positioning for UEs in various scenarios are supported. However, there are some open topics regarding the positioning. For example, regarding SRS sequence ID assignment in positioning, and regarding the positioning of UEs in RRC_INACTIVE state, there are some issues to be addressed.

SUMMARY

In general, example embodiments of the present disclosure provide a solution for SRS resource coordination for LPHAP positioning.

In a first aspect, there is provided an apparatus. The apparatus comprises 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 at least one of a first list of SRS sequence IDs for LPHAP UEs and a second list of SRS sequence IDs for non-LPHAP UEs; and transmit information indicative of the first list or the second list to at least one base station.

In a second aspect, there is provided a base station. The base station comprises at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the base station at least to: receive, from an apparatus, information indicative of at least one of a first list of SRS sequence IDs for LPHAP UEs and a second list of SRS sequence IDs for non-LPHAP UEs; and based on the received information, prevent from using SRS sequence IDs in the first list to non-LPHAP UEs.

In a third aspect, there is provided a method. The method comprises: determining, at an apparatus, at least one of a first of SRS sequence IDs for LPHAP UEs and a second list of SRS sequence IDs for non-LPHAP UEs; and transmitting information indicative of the first list or the second list to at least one base station.

In a fourth aspect, there is provided a method. The method comprises: receiving, at a base station and from an apparatus, information indicative of at least one of a first list of SRS sequence IDs for LPHAP UEs and a second list of SRS sequence IDs for non-LPHAP UEs; and based on the received information, preventing from using SRS sequence IDs in the first list to non-LPHAP UEs.

In a fifth aspect, there is provided an apparatus. The apparatus comprises: means for determining at least one of a first list of SRS sequence IDs for LPHAP UEs and a second list of SRS sequence IDs for non-LPHAP UEs; and means for transmitting information indicative of the first list or the second list to at least one base station.

In a sixth aspect, there is provided a first apparatus. The first apparatus comprises: means for receiving, from a second apparatus, information indicative of at least one of a first list of SRS sequence IDs for LPHAP UEs and a second list of SRS sequence IDs for non-LPHAP UEs; and means for based on the received information, preventing from using SRS sequence IDs in the first list to non-LPHAP UEs.

In a seventh aspect, there is provided a non-transitory computer-readable storage medium comprising instructions. The instructions, when executed by an apparatus, cause the apparatus to perform at least the following: determining at least one of a first of SRS sequence IDs for LPHAP UEs and a second list of SRS sequence IDs for non-LPHAP UEs; and transmitting information indicative of the first list or the second list to at least one base station.

In an eighth aspect, there is provided a non-transitory computer-readable storage medium comprising instructions. The instructions, when executed by a first apparatus, cause the first apparatus to perform at least the following: receiving, from a second apparatus, information indicative of at least one of a first list of SRS sequence IDs for LPHAP UEs and a second list of SRS sequence IDs for non-LPHAP UEs; and based on the received information, preventing from using SRS sequence IDs in the first list to non-LPHAP UEs.

In a ninth aspect, there is provided a computer program comprising instructions, which, when executed by an apparatus, cause the apparatus at least to: determine at least one of a first list of SRS sequence IDs for LPHAP UEs and a second list of SRS sequence IDs for non-LPHAP UEs; and transmit information indicative of the first list or the second list to at least one base station.

In a tenth aspect, there is provided a computer program comprising instructions, which, when executed by a first apparatus, cause the first apparatus at least to: receive, from a second apparatus, information indicative of at least one of a first list of SRS sequence IDs for LPHAP UEs and a second list of SRS sequence IDs for non-LPHAP UEs; and based on the received information, prevent from using SRS sequence IDs in the first list to non-LPHAP UEs.

In an eleventh aspect, there is provided an apparatus. The apparatus comprises: determining circuitry configured to determine at least one of a first list of SRS sequence IDs for LPHAP UEs and a second list of SRS sequence IDs for non-LPHAP UEs; and transmitting circuitry configured to transmit information indicative of the first list or the second list to at least one base station.

In a twelfth aspect, there is provided a base station. The base station comprises: receiving circuitry configured to receive, from an apparatus, information indicative of at least one of a first list of SRS sequence IDs for LPHAP UEs and a second list of SRS sequence IDs for non-LPHAP UEs; and preventing circuitry configured to, based on the received information, prevent from using SRS sequence IDs in the first list to non-LPHAP UEs.

It is to be understood that the summary section is not intended to identify key or essential features of embodiments of the present disclosure, nor is it intended to be used to limit the scope of the present disclosure. Other features of the present disclosure will become easily comprehensible through the following description.

BRIEF DESCRIPTION OF THE DRAWINGS

Some example embodiments will now be described with reference to the accompanying drawings, in which:

FIG. 1 illustrates an example of a network environment in which some example embodiments of the present disclosure may be implemented;

FIG. 2 illustrates a flowchart illustrating a communication process in accordance with some example embodiments of the present disclosure;

FIG. 3 illustrates schematically an example signaling process in accordance with some example embodiments of the present disclosure;

FIG. 4 illustrates a flowchart of an example method implemented at an apparatus in accordance with some embodiments of the present disclosure;

FIG. 5 illustrates another flowchart of an example method implemented at a base station in accordance with some embodiments of the present disclosure;

FIG. 6 illustrates a simplified block diagram of a device that is suitable for implementing some example embodiments of the present disclosure; and

FIG. 7 illustrates a block diagram of an example of a computer-readable medium in accordance with some example embodiments of the present disclosure.

Throughout the drawings, the same or similar reference numerals represent the same or similar elements.

DETAILED DESCRIPTION

Principles of the present disclosure will now be described with reference to some example embodiments. It is to be understood that these embodiments are described only for the purpose of illustration and help those skilled in the art to understand and implement the present disclosure, without suggesting any limitation as to the scope of the disclosure. The disclosure described herein can be implemented in various manners other than the ones described below.

In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skills in the art to which this disclosure belongs.

References in the present disclosure to “one embodiment, ” “an embodiment, ” “an example embodiment, ” and the like indicate that the embodiment described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

It shall be understood that although the terms “first” and “second” etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and similarly, a second element could be termed a first element, without departing from the scope of example embodiments. As used herein, the term “and/or” includes any and all combinations of one or more of the listed terms.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms “a” , “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” , “comprising” , “has” , “having” , “includes” and/or “including” , when used herein, specify the presence of stated features, elements, and/or components etc., but do not preclude the presence or addition of one or more other features, elements, components and/or combinations thereof. As used herein, “at least one of the following: <a list of two or more elements>” and “at least one of <a list of two or more elements>” and similar wording, where the list of two or more elements are joined by “and” or “or” , mean at least any one of the elements, or at least any two or more of the elements, or at least all the elements.

As used in this application, the term “circuitry” may refer to one or more or all of the following:

(a) hardware-only circuit implementations (such as implementations in only analog and/or digital circuitry) and

(b) combinations of hardware circuits and software, such as (as applicable) :

(i) a combination of analog and/or digital hardware circuit (s) with software/firmware and

(ii) any portions of hardware processor (s) with software (including digital signal processor (s) ) , software, and memory (ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) and

(c) hardware circuit (s) and or processor (s) , such as a microprocessor (s) or a portion of a microprocessor (s) , that requires software (for example, firmware) for operation, but the software may not be present when it is not needed for operation.

This definition of circuitry applies to all uses of this term in this application, including in any claims. As a further example, as used in this application, the term circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware. The term circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other computing or network device.

As used herein, the term “communication network” refers to a network following any suitable communication standards, such as Long Term Evolution (LTE) , LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , High-Speed Packet Access (HSPA) , Narrow Band Internet of Things (NB-IoT) and so on. Furthermore, the communications between a terminal device and a network device in the communication network may be performed according to any suitable generation communication protocols, including, but not limited to, the fourth generation (4G) , 4.5G, the fifth generation (5G) communication protocols, sixth generation (6G) communication protocols, and/or any other protocols either currently known or to be developed in the future. Embodiments of the present disclosure may be applied in various communication systems. Given the rapid development in communications, there will of course also be future type communication technologies and systems with which the present disclosure may be embodied. It should not be seen as limiting the scope of the present disclosure to only the aforementioned system.

As used herein, the term “access network device” refers to a node in a communication network via which a terminal device accesses the network and receives services therefrom. The network device may refer to a base station (BS) or an access point (AP) , for example, a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a NR NB (also referred to as a gNB) , a Remote Radio Unit (RRU) , a radio header (RH) , a remote radio head (RRH) , a relay, a low power node such as a femto, a pico, and so forth, depending on the applied terminology and technology. In the following description, the terms “access network device” and “access network node” may be used interchangeably.

The term “core network (CN) device” refers to a device capable of communicating with the access network device and providing services to the terminal device in a core network. Examples of the core network device may include Location Management Function (LMF) , Mobile Switching Centers (MSCs) , Mobility Management Entities (MMEs) , Access and Mobility Management Functions (AMFs) , Operation and Management (O&M) nodes, Operation Support System (OSS) nodes, Self-Organization Network (SON) nodes, positioning nodes, such as Enhanced Serving Mobile Location Centers (E-SMLCs) . In other embodiments, the core network device may be any other suitable application or entity in a core network.

The term “terminal device” refers to any end device that may be capable of wireless communication. By way of example rather than limitation, a terminal device may also be referred to as a communication device, user equipment (UE) , a Subscriber Station (SS) , a Portable Subscriber Station, a Mobile Station (MS) , or an Access Terminal (AT) . The terminal device may include, but not limited to, a mobile phone, a cellular phone, a smart phone, voice over IP (VoIP) phones, wireless local loop phones, a tablet, a wearable terminal device, a personal digital assistant (PDA) , portable computers, desktop computer, image capture terminal devices such as digital cameras, gaming terminal devices, music storage and playback appliances, vehicle-mounted wireless terminal devices, wireless endpoints, mobile stations, laptop-embedded equipment (LEE) , laptop-mounted equipment (LME) , USB dongles, smart devices, wireless customer-premises equipment (CPE) , an Internet of Things (loT) device, a watch or other wearable, a head-mounted display (HMD) , a vehicle, a drone, a medical device and applications (for example, remote surgery) , an industrial device and applications (for example, a robot and/or other wireless devices operating in an industrial and/or an automated processing chain contexts) , a consumer electronics device, a device operating on commercial and/or industrial wireless networks, and the like. In the following description, the terms “terminal device” , “communication device” , “terminal” , “user equipment” and “UE” may be used interchangeably.

Reference is first made to FIG. 1, which illustrates an example of communication system in which some example embodiments of the present disclosure may be implemented. As shown in FIG. 1, the communication network 100 includes a UE 110, an apparatus 120, and a set of base stations 130-1, 130-2…130-N which may be collectively referred to as a set of base stations 130. The apparatus 120 may be a network device in the core network, for example, an LMF. The base stations 130-1, 130-2…130-N may be base stations for providing radio coverage to the UE 110 and may belong to a same validity area (for example, in a same sounding reference signal (SRS) validating area) . That is to say, there are multiple cells in the validity area, which are providing by the base stations 130-1, 130-2…130-N. The base stations 130-1, 130-2…130-N may be collectively referred to as a set of base stations 130, or collectively referred to as base stations 130. In a period, the UE 110 may be served by one of the base stations 130-1, 130-2…130-N, for example by the base station 130-1. The UE 110 may move from a cell provided by the base station 130-1 to another cell, for example, to any one of cells providing by the base stations 130-2…130-N.

It is to be understood that the number of the UE 110, the number of the apparatus 120 and the number of the base stations 130-1, 130-2…130-N as shown in the communication network 100 are only for the purpose of illustration, without any limitation to the scope of the present disclosure. In some example embodiments, the communication network 100 may include any number of UEs, any number of base stations and/or any number of apparatuses as the apparatus 120.

With communicating positioning signals between the UE 110 and some of the base stations 130-1, 130-2…130-N, based on the coordination and management of the apparatus 120, a physical position of the UE 110 may be estimated.

Positioning techniques may be used to estimate a physical location of a UE. For example, the following positioning techniques may be used in NR: downlink time difference of arrival (DL-TDoA) , uplink time difference of arrival (UL-TDoA) , downlink angle of departure (DL-AoD) , uplink angle of arrival (UL-AoA) , and/or multi-cell round trip time (multi-RTT) . The positioning reference signal (PRS) and sounding reference signal (SRS) may be used as reference signals for estimating the location of the UE. SRS is a reference signal for positioning in the uplink (UL) .

At the RAN#98 meeting, a new work item was approved (RP-223549, “New WID on Expanded and Improved NR Positioning” ) . Some objectives are associated with low-power high-accuracy positioning (LPHAP) , which are highlighted in bold as follows:

At RAN3#120, there were discussions about how to coordinate SRS resources within an SRS validity area. Although no agreements were captured, the following next step was identified in the Chair’s Minutes:

Accordingly, the present disclosure will focus on the coordination of SRS resources within an SRS positioning validity area.

In the RAN1#112bis-e meeting, there were some discussions on cross-cell SRS configuration, and the following agreements were achieved:

From the agreement above, the sequence ID (s) for SRS resource (s) should be unique within the validity area among the involved gNBs. The main problem is how to determine the sequence ID for SRS resource in the validity area, i.e., how to ensure that sequence ID (s) allocated to a specific UE by a specific gNB is not concurrently allocated to any other UEs within the same validity area.

In some embodiments of the present disclosure, a novel SRS sequence ID coordination mechanism is proposed for LPHAP positioning. In particular, the present disclosure proposes a sequence ID coordination method for LPHAP positioning, which effectively avoids the SRS sequence ID collision between LPHAP UEs and/or normal UEs in a validity area comprising multiple gNBs.

The basic idea of some embodiments of the present disclosure is to let an apparatus (e.g., LMF) determine one exclusive SRS sequence ID list to be used only for LPHAP UEs in the positioning validity area and indicate the list to base stations (e.g., gNBs) in the validity area. Based on the list, the base stations (e.g., gNBs) can know that the SRS sequence IDs in the list cannot be used for normal UEs to avoid the interference between LPHAP UEs and normal UEs. Then, the apparatus (e.g., LMF) may select one or multiple SRS sequence IDs from the list and recommend it/them to the serving base station (e.g., the serving gNB) for a specific LPHAP UE. Such operation can make sure that each cell uses different sequences to avoid interference issue among the involved base stations (e.g., gNBs) .

According to some embodiments of the present disclosure, an apparatus determines at least one of a first list of SRS sequence IDs for LPHAP UEs and a second list of SRS sequence IDs for non-LPHAP UEs. Then, the apparatus transmits information indicative of the first list or the second list to at least one base station. On the other hand, based on the received information indicative of the first list or the second list, the base stations prevent from using SRS sequence IDs in the list for non-LPHAP UEs. In this way, the following advantages may be achieved: effectively avoid interference issue among the gNBs by making each gNB uses different SRS sequence; and effectively avoid interference issue between LPHAP UEs and normal UEs by assign the exclusive SRS sequence ID list for LPHAP UEs.

FIG. 2 illustrates a flowchart illustrating a communication process 200 in accordance with some example embodiments of the present disclosure. For the purpose of discussion, the communication process 200 will be described with reference to FIG. 1. It would be appreciated that although the communication process 200 has been described referring to the network environment 100 of FIG. 1, this communication process 200 may be likewise applied to other similar communication scenarios.

As shown in FIG. 2, an apparatus 120 determines 210 at least one of a first list of SRS sequence IDs for LPHAP UEs and a second list of SRS sequence IDs for non-LPHAP UEs. Then, the apparatus 120 transmits 220 information indicative of the first list or the second list to a set of base stations 130 (i.e. base stations 130-1, 130-2…130-N) . On the other hand, the base stations 130-1, 130-2…130-N receive, from the apparatus 120, the information indicative of the first list or the second list. Based on the received information, the base stations 130-1, 130-2…130-N prevent from using SRS sequence IDs in the first list to non-LPHAP UEs. It is noted that the term “non-LPHAP UEs” herein may also be referred to as “normal UEs” . It is noted that the set of base stations 130 should cover the case “only one base station” .

That is to say, the apparatus 120 determines an exclusive SRS sequence ID list which is to be only used for LPHAP UEs, and indicates it to the base stations 130-1, 130-2…130-N. After receiving the indication from the apparatus 120, the base stations know they should avoid using SRS sequences ID in this list to normal UEs so as to protect LPHAP use.

In some embodiments, all base stations included in the set of base stations 130 (i.e. all of the base stations 130-1, 130-2…130-N) are in one validity area (belong to the same validity area) . In some embodiments, the apparatus 120 may perform a location management function (LMF) or may be an LMF device, and the base stations 130 may be gNBs. In other words, the LMF may provide the gNBs with the exclusive sets of SRS sequence IDs for multi-cell (validity-area specific) SRS configuration and normal SRS configuration, where these SRS configurations may be for positioning SRS.

In some embodiments, the apparatus 120 may further select one or more SRS sequence IDs from the first list for an LPHAP UE (e.g. UE 110 in FIG. 1) in the validity area, and may then transmit the one or more SRS sequence IDs to a serving base station of the LPHAP UE. The serving base station may be included in the set of base stations 130. For example, the serving base station of the LPHAP UE may be the base stations 130-1.

In some embodiments, the serving base station may further determine one or more SRS sequence IDs based on the indicated one or more SRS sequence IDs (also referred to as a first one or more SRS sequence IDs) . Then, the serving base station may transmit the determined one or more SRS sequence IDs (also referred to as a second one or more SRS sequence IDs) to the LPHAP UE and the apparatus 120. Consequently, the apparatus 120 may transmit the determined/second one or more SRS sequence IDs to other base stations. As such, the LPHAP UE, the serving base station and the other base stations, being aware of the determined/second one or more SRS sequence IDs for the LPHAP UE, may perform positioning of the LPHAP UE.

In some embodiments, the first one or more SRS sequence IDs may be transmitted to the serving base station via a positioning information request message. For example, the one or more SRS sequence IDs may be added to a requested SRS transmission characteristic information element (IE) in the positioning information request message defined in NRPPa protocol. In some embodiments, the second one or more SRS sequence IDs may be transmitted via a positioning information response message defined in NRPPa protocol.

Thus, according to some embodiments of the present disclosure, the apparatus 120 may make SRS sequence ID determination for a specific LPHAP UE. It selects one or more sequence IDs from the exclusive SRS sequence ID list for an LPHAP UE, then recommends the sequence ID (s) to the serving base station for the LPHAP UE, for example, via a positioning information request defined in NRPPa protocol. The serving base station indicates the sequence ID (s) that it configured for the LPHAP UE to the apparatus 120, for example, via positioning information response message defined in NRPPa protocol.

In some embodiments, the apparatus 120 may determine the first list for the LPHAP UEs based on information on at least one of the following: a number of LPHAP UEs in a validity area; a number of transmission beams of LPHAP UEs in a validity area; or a number of cells in a validity area. For example, in order to get to know the number of transmission beams of LPHAP UEs in the validity area, the apparatus 120 may obtain information on a number of SRS resources which are to be configured per LPHAP UE or non-LPHAP UE. For example, base stations or UEs may be able to provide the following information to help the apparatus 120 determine the first list of SRS sequence IDs: the number of SRS resources that will be configured per LPHAP UE or Normal UE. The number of SRS resources may not be the same across multiple UEs, so the base stations may provide the average number of SRS resources that will be configured per UE.

In other words, when determining the first list for LPHAP UEs, the apparatus 120 may consider one or more of the following information: the number of LPHAP UEs, the number of transmission beams of the LPHAP UEs (it may affect the number of SRS resources per UE, and based on the current system configuration, different SRS sequence IDs are assigned to each SRS resource) , and the number of cells in the validity area.

In some embodiments, in order to determine the at least one of first list and the second list, the apparatus 120 may divide a plurality of SRS sequence IDs for positioning into a first set of SRS sequence IDs and a second set of SRS sequence IDs, then determine the first set of SRS sequence IDs only to be used for LPHAP UEs as the first list, and determine the second set of SRS sequence IDs for non-LPHAP UEs as the second list.

For example, in current specifications, the SRS sequence ID is configured with 16 bits. Thus, the maximum number of SRS sequence IDs can be 65536. The LMF can select some SRS sequence IDs for the LPHAP UEs, for example, the sequence IDs from 0 to 8191 can be selected as the exclusive SRS sequence ID list. As an example, following table 1 shows an example of exclusive SRS sequence ID list.

Table 1

Thus, according to some embodiments of the present disclosure, the exclusive sequence ID list may have properties as following: the exclusive sequence ID list includes multiple sequence IDs, the sequence IDs in this list only can be used for LPHAP UEs in the positioning validity area, and the size of this list might be flexible considering the number of LPHAP UEs, number of beams of each LPHAP UE, number of normal UEs, and the number of beams of the normal UEs in the validity area.

In some embodiments, the apparatus 120 may further receive from the set of base stations 130, a request for the information indicative of the first list or the second list. The transmitting of the information indicative of the first list or the second list is performed based on receiving the request. In some embodiments, the request for the information indicative of the first list or the second list and/or the information indicative of the first list or the second list may be transmitted via a non-UE associated message, for example, via a newly defined non-UE associated message, other than an existing message in the current NRPPa protocol. For example, a new non-UE associated message may be defined for it in the coming NRPPa protocol.

That is to say, the gNBs may request LMF to provide exclusive SRS sequence ID list for LPHAP UEs, and this request information may be transmitted via a new non-UE associated message by NRPPa protocol.

In view of above, some embodiments of the present disclosure provide the following advantages. The embodiments effectively avoid interference issue among the gNBs by making each gNB uses different SRS sequence, and effectively avoid interference issue between LPHAP UEs and normal UEs by assign the exclusive SRS sequence ID list for LPHAP UEs.

FIG. 3 illustrates an example signaling process 300 in accordance with some example embodiments of the present disclosure. In some embodiments, the new functionalities and messages may be embodied at 310, 312, 314, 316, 318, 320 and 322, which are highlighted in bold.

According to some embodiments, the LMF may determine one exclusive set of SRS sequences for LPHAP UEs and indicate to gNBs within a validity area. Then, the LMF selects one or multiple SRS sequence IDs from the exclusive SRS sequence ID list for a particular LPHAP UE, and then recommends the sequence IDs to the serving gNB. It is noted that the serving gNB 304 in in FIG. 3 may be one of the gNBs within the validity area.

As shown in FIG. 3, at 310, the serving gNB 304 requests LMF 308 to provide exclusive SRS sequence ID list for LPHAP UE (or SRS sequence ID list for multi-cell positioning SRS configuration and legacy positioning SRS configuration) . At 312, the (other) gNBs 306 within the validity area (i.e., other gNBs except for the serving gNB 304 within the validity area) also requests LMF 308 to provide the list. That is to say, at 310 and 312, The gNBs within the validity area request LMF 308 to provide exclusive SRS sequence ID list for LPHAP UE (or SRS sequence ID list for multi-cell positioning SRS configuration and legacy positioning SRS configuration) . In some embodiments, this request information may be transmitted via a new non-UE associated message by NRPPa protocol.

At 314, LMF 308 performs exclusive SRS sequence ID list determination. The SRS sequence ID in this list can only be used for LPHAP UEs to avoid the interference between LPHAP UEs and other non-LPHAP UEs. As an example embodiment, the LMF may split all the SRS sequence IDs into two sets: exclusive SRS sequence ID list for LPHAP UEs in the validity area (set#1) and one SRS sequence ID list for other non-LPHAP UEs (set #2) , as shown in table 1 above.

The exclusive SRS sequence ID list may be determined based on the number of LPHAP UEs or the number of cells in the validity area. As an example, the number of SRS sequence IDs in exclusive list may be determined by the number of LPHAP UEs. As another example, the number of SRS sequence IDs in exclusive SRS sequence ID list may be determined based on the number of cells in the validity area.

For example, in current specifications, the SRS sequence ID is configured with 16 bits. Thus, the maximum number of SRS sequence IDs can be 65536. The LMF can select some SRS sequence IDs for the LPHAP UEs, for example, the sequence IDs from 0 to 8191 can be selected as the exclusive SRS sequence ID list as shown in table 1 above.

The gNB/UE may be able to provide the following information to help the LMF determine the set of SRS sequence IDs: the number of SRS resources that will be configured per LPHAP UE or Normal UE. The number of SRS resources may not be the same across multiple UEs, so the gNB may provide the average number of SRS resources that will be configured per UE.

The LMF may provide the gNB with the exclusive sets of SRS sequence IDs for multi-cell (validity-area specific) SRS configuration and normal SRS configuration, where these SRS configurations may be for positioning SRS.

At 316 and 318, exclusive SRS sequence ID list indication is performed. LMF 308 may indicate the exclusive SRS sequence ID list to gNBs via a new non-UE associated message by NRPPa protocol. For example, as shown in table 1, LMF 308 indicates the SRS sequence IDs in set#1 to the gNBs in the validity area. Alternatively, or additionally, an SRS sequence ID list for normal UEs may be indicated to gNBs.

After received the indication from LMF, gNBs knows that the SRS sequence IDs from the exclusive SRS sequence ID list can only be used for LPHAP UEs in the validity area. The gNB cannot use an SRS sequence ID from the exclusive SRS sequence ID unless it is recommended by the LMF. And other SRS sequence IDs can be used by other non-LPHAP UEs. The gNB is free to use these other SRS sequence IDs without recommendation/permission from the LMF. For example, as shown in table 1, the gNBs in the validity area know that the SRS sequence IDs in the set#1 can only be used for LPHAP UEs.

At 320, sequence ID determination for a specific LPHAP UE may be performed. LMF 308 selects one or multiple SRS sequence IDs from the determined exclusive SRS sequence ID list (i.e., set#1 as shown in table 1) for a specific LPHAP UE. It is noted that each UE may be configured with multiple SRS resources within an SRS resource set. And a single SRS sequence ID is assigned to each SRS resource. Between different SRS resources, typically the SRS sequence ID is not the same. Thus, multiple SRS sequence IDs are needed to be configured for each UE.

At 322, sequence ID indication from LMF 308 to serving gNB 304 may be performed. LMF 308 recommends the sequence ID (s) to the serving gNB 304 for a specific LPHAP UE (LPHAP UE 302) , for example, via a positioning information request message by NRPPa protocol. The sequence ID may be added to the Requested SRS Transmission Characteristics IE in the positioning information request message.

At 324, sequence ID indication from serving gNB to UE (LPHAP UE 302) may be performed. The serving gNB determines the final SRS sequence ID (s) based on the recommended sequence ID (s) from LMF. The serving gNB sends the SRS configuration including SRS sequence ID (s) to UE (LPHAP UE 302) , for example, via RRC release message.

At 326, sequence ID indication from serving gNB 304 to LMF 308 may be performed. The serving gNB 304 sends the determined SRS sequence ID (s) to the LMF 308, for example, via a positioning information response message by NRPPa protocol.

In this way, some advantages may be achieved. For example, effectively avoid interference issue among the gNBs by making each gNB uses different SRS sequence, and effectively avoid interference issue between LPHAP UEs and normal UEs by assign the exclusive SRS sequence ID list for LPHAP UEs.

FIG. 4 illustrates a flowchart of an example method 400 implemented at an apparatus (e.g. the apparatus 120) in accordance with some embodiments of the present disclosure. For the purpose of discussion, the method 400 will be described from the perspective of the apparatus 120 with reference to FIGS. 1 and 2.

At block 410, the apparatus determines at least one of a first list of SRS sequence IDs for LPHAP UEs and a second list of SRS sequence IDs for non-LPHAP UEs. At block 420, the apparatus transmits information indicative of the first list or the second list to at least one base station.

In some embodiments, the apparatus may further select one or more SRS sequence IDs from the first list for an LPHAP UE in a validity area; and transmit the one or more SRS sequence IDs to a serving base station of the LPHAP UE, wherein the serving base station is included in the at least one base station.

In some embodiments, the apparatus may determine the at least one of first list and the second list by: dividing a plurality of SRS sequence IDs for positioning into a first set of SRS sequence IDs and a second set of SRS sequence IDs; determining the first set of SRS sequence IDs only to be used for LPHAP UEs as the first list; and determining the second set of SRS sequence IDs for non-LPHAP UEs as the second list.

In some embodiments, the first list may be determined based on information on at least one of the following: a number of LPHAP UEs in a validity area; a number of transmission beams of LPHAP UEs in a validity area; or a number of cells in a validity area. In some embodiments, the apparatus may further receive information on a number of SRS resources which are to be configured per LPHAP UE or non-LPHAP UE. In some embodiments, the apparatus may further receive, from the at least one base station, a request for the information indicative of the first list or the second list, wherein the transmitting of the information indicative of the first list or the second list is performed based on receiving the request.

In some embodiments, the apparatus may transmit the information indicative of the first list or the second list via a non-UE associated message. In some embodiments, the one or more SRS sequence IDs may be transmitted to the serving base station via a positioning information request message. In some embodiments, the one or more SRS sequence IDs may be added to a requested SRS transmission characteristic information element (IE) of the positioning information request message.

In some embodiments, the one or more SRS sequence IDs may be a first one or more SRS sequence IDs, and the apparatus may further receive, from the serving base station, second one or more SRS sequence IDs, which are determined for the LPHAP UE by the serving base station based on the first one or more SRS sequence IDs.

In some embodiments, the second one or more SRS sequence IDs may be received via a positioning information response message. In some embodiments, all base stations included in the at least one base station may be in one validity area. In some embodiments, the apparatus may perform a location management function (LMF) , and/or the serving base station may be a gNB.

FIG. 5 illustrates another flowchart of an example method 500 implemented at a base station (e.g. base stations 130) in accordance with some other embodiments of the present disclosure. For the purpose of discussion, the method 500 will be described from the perspective of the base stations 130 with reference to FIGS. 1 and 2.

At block 510, the base station receives, from an apparatus, information indicative of at least one of a first list of SRS sequence IDs for LPHAP UEs and a second list of SRS sequence IDs for non-LPHAP UEs. At block 520, based on the received information, the base station prevents from using SRS sequence IDs in the first list to non-LPHAP UEs.

In some embodiments, the base station may further receive, from the apparatus, first one or more SRS sequence IDs selected from the first list for an LPHAP UE in a validity area, wherein the LPHAP UE is served by the base station; and determine second one or more SRS sequence IDs for the LPHAP UE based on the first one or more SRS sequence IDs.

In some embodiments, the base station may further transmit, to the apparatus, information on a number of SRS resources which are to be configured per LPHAP UE or non-LPHAP UE. In some embodiments, the base station may further transmit a request for the information indicative of the first list or the second list to the apparatus, wherein the information indicative of the first list or the second list is transmitted by the apparatus based on receiving the request.

In some embodiments, the request may be transmitted via a non-UE associated message. In some embodiments, the information indicative of the first list or the second list may be received via a non-UE associated message. In some embodiments, the base station may further transmit the second one or more SRS sequence IDs to at least one of the LPHAP UE or the apparatus. In some embodiments, the first one or more SRS sequence IDs may be received via a positioning information request message.

In some embodiments, the first one or more SRS sequence IDs may be included in a requested SRS transmission characteristic IE of the positioning information request message. In some embodiments, the second one or more SRS sequence IDs may be transmitted to the apparatus via a positioning information response message. In some embodiments, the apparatus may perform a location management function (LMF) , and/or the base station may be a gNB.

In some embodiments, an apparatus capable of performing the method 400 (for example, the apparatus 120) may comprise means for performing the respective steps of the method 400. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.

In some example embodiments, the apparatus comprises: means for determining at least one of a first list of sounding reference signal (SRS) sequence identifiers (IDs) for low-power high-accuracy positioning (LPHAP) user equipments (UEs) and a second list of SRS sequence IDs for non-LPHAP UEs; and means for transmitting information indicative of the first list or the second list to at least one base station.

In some embodiments, the apparatus may further comprise: means for selecting one or more SRS sequence IDs from the first list for an LPHAP UE in a validity area; and means for transmitting the one or more SRS sequence IDs to a serving base station of the LPHAP UE, wherein the serving base station is included in the at least one base station.

In some embodiments, the means for determining the at least one of first list and the second list may comprise: means for dividing a plurality of SRS sequence IDs for positioning into a first set of SRS sequence IDs and a second set of SRS sequence IDs; means for determining the first set of SRS sequence IDs only to be used for LPHAP UEs as the first list; and means for determining the second set of SRS sequence IDs for non-LPHAP UEs as the second list.

In some embodiments, the first list may be determined based on information on at least one of the following: a number of LPHAP UEs in a validity area; a number of transmission beams of LPHAP UEs in a validity area; or a number of cells in a validity area.

In some embodiments, the apparatus may further comprise means for receiving information on a number of SRS resources which are to be configured per LPHAP UE or non-LPHAP UE.

In some embodiments, the apparatus may further comprise means for receiving, from the at least one base station, a request for the information indicative of the first list or the second list, wherein the transmitting of the information indicative of the first list or the second list may be performed based on receiving the request.

In some embodiments, the information indicative of the first list or the second list may be transmitted via a non-UE associated message.

In some embodiments, the one or more SRS sequence IDs may be transmitted to the serving base station via a positioning information request message.

In some embodiments, the one or more SRS sequence IDs may be added to a requested SRS transmission characteristic information element (IE) of the positioning information request message.

In some embodiments, the one or more SRS sequence IDs may be a first one or more SRS sequence IDs, and the apparatus may further comprise means for receiving, from the serving base station, second one or more SRS sequence IDs, which are determined for the LPHAP UE by the serving base station based on the first one or more SRS sequence IDs.

In some embodiments, the second one or more SRS sequence IDs may be received via a positioning information response message.

In some embodiments, all base stations included in the at least one base station may be in one validity area.

In some embodiments, the apparatus may perform a location management function (LMF) , and/or the serving base station may be a gNB.

In some embodiments, the apparatus further comprises means for performing other steps in some embodiments of the method 400. In some embodiments, the means comprises at least one processor and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the performance of the apparatus.

In some embodiments, a first apparatus capable of performing the method 500 (for example, the base stations 130) may comprise means for performing the respective steps of the method 500. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.

In some example embodiments, the first apparatus comprises: means for receiving, from a second apparatus, information indicative of at least one of a first list of sounding reference signal (SRS) sequence IDs for low-power high-accuracy positioning (LPHAP) user equipments (UEs) and a second list of SRS sequence IDs for non-LPHAP UEs; and means for based on the received information, preventing from using SRS sequence IDs in the list for non-LPHAP UEs.

In some embodiments, the first apparatus may further comprise: means for receiving, from the second apparatus, first one or more SRS sequence IDs selected from the first list for an LPHAP UE in a validity area, wherein the LPHAP UE is served by the first apparatus; and determine second one or more SRS sequence IDs for the LPHAP UE based on the first one or more SRS sequence IDs.

In some embodiments, the first apparatus may further comprise: means for transmitting, to the second apparatus, information on a number of SRS resources which are to be configured per LPHAP UE or non-LPHAP UE.

In some embodiments, the first apparatus may further comprise: means for transmitting a request for the information indicative of the first list or the second list to the second apparatus, wherein the information indicative of the first list or the second list is transmitted by the second apparatus based on receiving the request.

In some embodiments, the request may be transmitted via a non-UE associated message.

In some embodiments, the information indicative of the first list or the second list may be received via a non-UE associated message.

In some embodiments, the first apparatus may further comprise: means for transmitting the second one or more SRS sequence IDs to at least one of the LPHAP UE or the apparatus.

In some embodiments, the first one or more SRS sequence IDs may be received via a positioning information request message.

In some embodiments, the first one or more SRS sequence IDs may be included in a requested SRS transmission characteristic IE of the positioning information request message.

In some embodiments, the second one or more SRS sequence IDs may be transmitted to the apparatus via a positioning information response message.

In some embodiments, the second apparatus may perform a location management function (LMF) , and/or the first apparatus may be a gNB.

In some embodiments, the first apparatus further comprises means for performing other steps in some embodiments of the method 500. In some embodiments, the means comprises at least one processor and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the performance of the apparatus.

FIG. 6 illustrates a simplified block diagram of a device 600 that is suitable for implementing some example embodiments of the present disclosure. The device 600 may be provided to implement a communication device, for example, the base stations 130, the apparatus 120 as shown in FIGS. 1 and 2. As shown, the device 600 includes one or more processors 610, one or more memories 620 coupled to the processor 610, and one or more communication modules 640 coupled to the processor 610.

The communication module 640 is for bidirectional communications. The communication module 640 has at least one antenna to facilitate communication. The communication interface may represent any interface that is necessary for communication with other network elements.

The processor 610 may be of any type suitable to the local technical network and may include one or more of the following: general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples. The device 600 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.

The memory 620 may include one or more non-volatile memories and one or more volatile memories. Examples of the non-volatile memories include, but are not limited to, a Read Only Memory (ROM) 624, an electrically programmable read only memory (EPROM) , a flash memory, a hard disk, a compact disc (CD) , a digital video disk (DVD) , and other magnetic storage and/or optical storage. Examples of the volatile memories include, but are not limited to, a random access memory (RAM) 622 and other volatile memories that will not last in the power-down duration.

A computer program 630 includes computer executable instructions that are executed by the associated processor 610. The program 630 may be stored in the ROM 624. The processor 610 may perform any suitable actions and processing by loading the program 630 into the RAM 622.

The embodiments of the present disclosure may be implemented by means of the program 630 so that the device 600 may perform any process of the disclosure as discussed with reference to FIG. 2. The embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.

In some example embodiments, the program 630 may be tangibly contained in a computer-readable medium which may be included in the device 600 (such as in the memory 620) or other storage devices that are accessible by the device 600. The device 600 may load the program 630 from the computer-readable medium to the RAM 622 for execution. The computer-readable medium may include any types of tangible non-volatile storage, such as ROM, EPROM, a flash memory, a hard disk, CD, DVD, and the like.

FIG. 7 illustrates a block diagram of an example of a computer-readable medium 900 in accordance with some example embodiments of the present disclosure. The computer-readable medium 700 has the program 630 stored thereon. It is noted that although the computer-readable medium 700 is depicted in form of CD or DVD in FIG. 7, the computer-readable medium 700 may be in any other form suitable for carry or hold the program 630.

Generally, various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representations, it is to be understood that the block, apparatus, system, technique or method described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.

The present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer-readable storage medium. The computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out the method 400 or 500 as described above with reference to FIG. 4 or 5. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types. The functionality of the program modules may be combined or split between program modules as desired in various embodiments. Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.

Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowcharts and/or block diagrams to be implemented. The program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.

In the context of the present disclosure, the computer program codes or related data may be carried by any suitable carrier to enable the device, apparatus or processor to perform various processes and operations as described above. Examples of the carrier include a signal, computer-readable medium, and the like.

The computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. A computer-readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the computer-readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. The term “non-transitory, ” as used herein, is a limitation of the medium itself (i.e., tangible, not a signal) as opposed to a limitation on data storage persistency (e.g., RAM vs. ROM) .

Further, while operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing may be advantageous. Likewise, while several specific implementation details are contained in the above discussions, these should not be construed as limitations on the scope of the present disclosure, but rather as descriptions of features that may be specific to particular embodiments. Certain features that are described in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment may also be implemented in multiple embodiments separately or in any suitable sub-combination.

Although the present disclosure has been described in languages specific to structural features and/or methodological acts, it is to be understood that the present disclosure defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims

An apparatus comprising:

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 at least one of a first list of sounding reference signal (SRS) sequence identifiers (IDs) for low-power high-accuracy positioning (LPHAP) user equipments (UEs) and a second list of SRS sequence IDs for non-LPHAP UEs; and

transmit information indicative of the first list or the second list to a at least one base station.
The apparatus of claim 1, wherein the apparatus is further caused to:

select one or more SRS sequence IDs from the first list for an LPHAP UE in a validity area; and

transmit the one or more SRS sequence IDs to a serving base station of the LPHAP UE, wherein the serving base station is included in the at least one base station.
The apparatus of claim 1 or 2, wherein the apparatus is caused to determine the at least one of first list and the second list by:

dividing a plurality of SRS sequence IDs for positioning into a first set of SRS sequence IDs and a second set of SRS sequence IDs;

determining the first set of SRS sequence IDs only to be used for LPHAP UEs as the first list; and

determining the second set of SRS sequence IDs for non-LPHAP UEs as the second list.
The apparatus of any of claims 1-3, wherein the first list is determined based on information on at least one of the following:

a number of LPHAP UEs in a validity area;

a number of transmission beams of LPHAP UEs in a validity area; or

a number of cells in a validity area.
The apparatus of any of claims 1-4, wherein the apparatus is further caused to:

receive information on a number of SRS resources which are to be configured per LPHAP UE or non-LPHAP UE.
The apparatus of any of claims 1-5, wherein the apparatus is further caused to:

receive, from the at least one base station, a request for the information indicative of the first list or the second list, wherein the transmitting of the information indicative of the first list or the second list is performed based on receiving the request.
The apparatus of any of claims 1-6, wherein the apparatus is caused to transmit the information indicative of the first list or the second list via a non-UE associated message.
The apparatus of any of claims 2-7, wherein the one or more SRS sequence IDs are transmitted to the serving base station via a positioning information request message.
The apparatus of claim 8, wherein the one or more SRS sequence IDs are added to a requested SRS transmission characteristic information element (IE) of the positioning information request message.
The apparatus of any of claims 2-9, wherein the one or more SRS sequence IDs are first one or more SRS sequence IDs, and the apparatus is further caused to:

receive, from the serving base station, second one or more SRS sequence IDs, which are determined for the LPHAP UE by the serving base station based on the first one or more SRS sequence IDs.
The apparatus of claim 10, wherein the second one or more SRS sequence IDs are received via a positioning information response message.
The apparatus of any of claims 1-7, wherein all base stations included in the at least one base station are in one validity area.
The apparatus of any of claims 1-12, wherein the apparatus performs a location management function (LMF) , and/or the serving base station is a gNB.
A base station comprising:

at least one processor; and

at least one memory storing instructions that, when executed by the at least one processor, cause the base station at least to:

receive, from an apparatus, information indicative of at least one of a first list of sounding reference signal (SRS) sequence IDs for low-power high-accuracy positioning (LPHAP) user equipments (UEs) and a second list of SRS sequence IDs for non-LPHAP UEs; and

based on the received information, prevent from using SRS sequence IDs in the first list to non-LPHAP UEs.
The base station of claim 14, wherein the apparatus is further caused to:

receive, from the apparatus, first one or more SRS sequence IDs selected from the first list for an LPHAP UE in a validity area, wherein the LPHAP UE is served by the base station; and

determine second one or more SRS sequence IDs for the LPHAP UE based on the first one or more SRS sequence IDs.
The base station of claim 14 or 15, wherein the base station is further caused to:

transmit, to the apparatus, information on a number of SRS resources which are to be configured per LPHAP UE or non-LPHAP UE.
The base station of any of claims 14-16, wherein the base station is further caused to:

transmit a request for the information indicative of the first list or the second list to the apparatus, wherein the information indicative of the first list or the second list is transmitted by the apparatus based on receiving the request.
The base station of claim 17, wherein the request is transmitted via a non-UE associated message.
The base station of any of claims 14-18, wherein the information indicative of the first list or the second list is received via a non-UE associated message.
The base station of any of claims 15-19, wherein the base station is further caused to:

transmit the second one or more SRS sequence IDs to at least one of the LPHAP UE or the apparatus.
The base station of any of claims 15-20, wherein the first one or more SRS sequence IDs are received via a positioning information request message.
The base station of claim 21, wherein the first one or more SRS sequence IDs are included in a requested SRS transmission characteristic IE of the positioning information request message.
The base station of claim 20, wherein the second one or more SRS sequence IDs are transmitted to the apparatus via a positioning information response message.
The base station of any of claims 14-23, wherein the apparatus performs a location management function (LMF) , and/or the base station is a gNB.
A method comprising:

determining, at an apparatus, at least one of a first of sounding reference signal (SRS) sequence identifiers (IDs) for low-power high-accuracy positioning (LPHAP) user equipments (UEs) and a second list of SRS sequence IDs for non-LPHAP UEs; and

transmitting information indicative of the first list or the second list to at least one base station.
A method comprising:

receiving, at a base station and from an apparatus, information indicative of at least one of a first list of sounding reference signal (SRS) sequence IDs for low-power high-accuracy positioning (LPHAP) user equipments (UEs) and a second list of SRS sequence IDs for non-LPHAP UEs; and

based on the received information, preventing from using SRS sequence IDs in the first list to non-LPHAP UEs.
An apparatus comprising:

means for determining at least one of a first list of sounding reference signal (SRS) sequence identifiers (IDs) for low-power high-accuracy positioning (LPHAP) user equipments (UEs) and a second list of SRS sequence IDs for non-LPHAP UEs; and

means for transmitting information indicative of the first list or the second list to a at least one base station.
An first apparatus comprising:

means for receiving, from a second apparatus, information indicative of at least one of a first list of sounding reference signal (SRS) sequence IDs for low-power high-accuracy positioning (LPHAP) user equipments (UEs) and a second list of SRS sequence IDs for non-LPHAP UEs; and

means for based on the received information, preventing from using SRS sequence IDs in the first list to non-LPHAP UEs.
A non-transitory computer readable medium comprising program instructions for causing an apparatus to perform at least the method of any of claims 25-26.