CN112534891B

CN112534891B - Uplink power control method and device for sounding reference signal transmission

Info

Publication number: CN112534891B
Application number: CN201980008011.5A
Authority: CN
Inventors: 郭力
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-07-19
Filing date: 2019-12-12
Publication date: 2023-04-28
Anticipated expiration: 2039-12-12
Also published as: CN112534891A; WO2021012586A1

Abstract

Methods and apparatus for uplink power control for Sounding Reference Signal (SRS) transmission for positioning purposes are provided. A method of uplink power control for Sounding Reference Signal (SRS) transmission of a User Equipment (UE) includes: configuration information of SRS resources for positioning purposes is configured through a network, wherein the configuration information comprises power control parameters associated with a serving cell and power control parameters associated with adjacent cells; and determining transmission power associated with the serving cell and transmission power associated with the neighboring cell of the SRS resource for positioning purposes according to the configuration information. The SRS transmission has enough transmit power to reach multiple neighbor cells to support reliable positioning measurements. Therefore, the positioning accuracy and reliability based on uplink measurement are improved.

Description

Uplink power control method and device for sounding reference signal transmission

Technical Field

The present disclosure relates to the field of communication systems, and more particularly, to a method and apparatus for uplink power control for Sounding Reference Signal (SRS) transmission.

Background

In the current design, the drawbacks of the current power control method for Sounding Reference Signal (SRS) transmission are: the detectability of SRS transmissions for positioning may be compromised and some neighboring cells may not receive SRS transmissions for positioning with good quality, so the performance of positioning the UE based on uplink signal measurements (e.g., uplink relative time of arrival (RTOA)) may be degraded.

In the existing method specified in release 15, the transmission power of SRS transmission is based only on the path loss between the User Equipment (UE) and the network such as serving next generation node B (gNB), and the path loss of the neighboring cells is not considered. However, in general, the neighboring cell is farther from the UE than the serving gNB, so the path loss between the neighboring cell and the UE is greater than the path loss between the serving gNB and the UE. The transmit power of SRS transmissions based on the current approach may be too small to reach the neighboring cell to be received correctly. Uplink RTOA-based positioning relies on measurement of SRS transmissions from one UE by multiple cells including a serving cell and multiple neighbor cells. The current approach compromises the detectability of SRS positioning on the neighbor cell side and reduces the number of neighbor cells that can correctly detect SRS transmissions. The result is a compromised performance of the UE location services.

Accordingly, there is a need for a method and apparatus for uplink power control for Sounding Reference Signal (SRS) transmission for positioning purposes.

Disclosure of Invention

An object of the present disclosure is to propose a method and apparatus for uplink power control for Sounding Reference Signal (SRS) transmission for positioning purposes, which can improve positioning accuracy and reliability based on uplink measurements.

In a first aspect of the present disclosure, a method for uplink power control for Sounding Reference Signal (SRS) transmission of a User Equipment (UE) includes: configuring, by the network, configuration information of SRS resources for positioning purposes, wherein the configuration information includes power control parameters associated with the serving cell and power control parameters associated with neighboring cells; and determining a transmission power associated with the serving cell and a transmission power associated with the neighboring cell of the SRS resource for positioning purposes according to the configuration information.

In a second aspect of the present disclosure, a User Equipment (UE) for uplink power control for Sounding Reference Signal (SRS) transmission includes a memory, a transceiver, and a processor coupled with the memory and the transceiver. The processor is configured to configure, by the network, configuration information of SRS resources for positioning purposes, wherein the configuration information includes power control parameters associated with a serving cell and power control parameters associated with neighboring cells. The processor is configured to determine a transmit power associated with a serving cell and a transmit power associated with a neighboring cell of SRS resources for positioning purposes based on the configuration information.

In a third aspect of the present disclosure, a method for uplink power control for Sounding Reference Signal (SRS) transmission of a network includes: configuring configuration information of SRS resources for positioning purposes for a User Equipment (UE), wherein the configuration information includes power control parameters associated with a serving cell and power control parameters associated with neighboring cells; and requesting the UE to determine transmission power associated with the serving cell and transmission power associated with the neighboring cell of SRS resources for positioning purposes according to the configuration information.

In a fourth aspect of the present disclosure, a network for uplink power control for Sounding Reference Signal (SRS) transmission includes a memory, a transceiver, and a processor coupled with the memory and the transceiver. The processor is configured to configure configuration information of SRS resources for a User Equipment (UE) for positioning purposes, wherein the configuration information includes power control parameters associated with a serving cell and power control parameters associated with neighboring cells. The processor is configured to request the user equipment to determine a transmit power associated with the serving cell and a transmit power associated with the neighboring cell for SRS resources for positioning purposes based on the configuration information.

In a fifth aspect of the present disclosure, a non-transitory machine-readable storage medium has stored thereon instructions that, when executed by a computer, cause the computer to implement the above-described method.

In a sixth aspect of the present disclosure, a terminal device includes a processor and a memory for storing a computer program. The processor is configured to execute a computer program stored in the memory to implement the above-described method.

In a seventh aspect of the present disclosure, a network node comprises a processor and a memory for storing a computer program. The processor is configured to execute a computer program stored in the memory to implement the above-described method.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or related art, drawings that will be described in the embodiments are briefly introduced. It is evident that these drawings are merely some embodiments of the present disclosure, from which one of ordinary skill in the art could obtain other drawings without making inventive efforts.

Fig. 1 is a block diagram of a User Equipment (UE) and a network for SRS transmission according to an embodiment of the present disclosure.

Fig. 2 is a flowchart illustrating an SRS transmission method of a UE according to an embodiment of the present disclosure.

Fig. 3 is a flowchart illustrating an SRS transmission method of a network according to an embodiment of the present disclosure.

Fig. 4 illustrates a process of uplink power control for SRS transmission for positioning according to an embodiment of the present disclosure.

Fig. 5 illustrates a process of power headroom (headroom) reporting according to an embodiment of the present disclosure.

Fig. 6 is a block diagram of a wireless communication system according to an embodiment of the present disclosure.

Detailed Description

Embodiments of the present disclosure will be described in detail below by describing technical contents, structural features, achieved objects and effects thereof with reference to the attached drawings. In particular, the terminology used in the embodiments of the disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Fifth generation (5G) wireless systems are typically multi-beam based systems in the frequency range 2 (FR 2) from 24.25GHz to 52.6GHz, where networks and/or User Equipments (UEs) employ multiplexed transmit (Tx) and receive (Rx) analog beams to suppress large path loss in the high frequency band. In high-band systems (e.g., millimeter wave systems), networks and UEs are deployed with a large number of antennas, so large gain beamforming can be used to overcome large path loss and signal blockage. Due to hardware limitations and costs, the network and the UE may be equipped with only a limited number of transmit and receive units (TXRUs). Thus, hybrid beamforming mechanisms may be used in both the network and the UE. In order to obtain the best link quality between the network and the UE, the network and the UE need to align the analog beam direction for a specific downlink or uplink transmission. For downlink transmission, the network and UE need to find the best pair of network Tx beam and UE Rx beam, while for uplink transmission, the network and UE need to find the best pair of UE Tx beam and network Rx beam.

For communication between the network and one UE, the network and the UE need to determine which Tx and Rx beams to use. When one UE moves, the beams used by the network and the UE for communication may change. In the third generation partnership project (3 GPP) 5G specifications, the following functions are defined to support such multi-beam based operation.

In operation associated with beam measurement and reporting, in this function, the UE may measure one or more Tx beams of the network, and then the UE may select the best Tx beam and report its selection to the network. By measuring the Tx beams of the network, the UE may also measure one or more different Rx beams and then select the best Rx beam for one particular Tx beam of the network. In this function, the gNB may also measure one or more Tx beams of the UE and then select the best Tx beam for uplink transmission for the UE. To support measurement of Tx beams of the network, the network may transmit a plurality of Reference Signal (RS) resources and then configure the UE to measure the RS resources. The UE may then report an index of the selected RS resource or resources selected based on some measurement metric, e.g., layer 1reference signal received power (a layer 1reference signal received power,L1-RSRP). To support measurement of the UE's Tx beams for uplink transmission, the network may configure the UE to transmit one or more uplink RS resources (e.g., sounding Reference Signal (SRS) resources), which the network may then measure. The network may determine which Tx beam of the UE is most suitable for uplink transmission based on measuring e.g. L1-RSRP of RS resources.

In operation associated with the beam indication, the network may indicate which Tx beam of the UE network is used for transmission for downlink transmission so that the UE may receive the downlink transmission using the appropriate Rx beam. For Physical Downlink Control Channel (PDCCH) transmission, the network may indicate to the UE an Identification (ID) of one Tx beam of the network. For Physical Sidelink Discovery Channel (PSDCH) transmission, the network may use Downlink Control Information (DCI) in the PDCCH to indicate an ID of one Tx beam for transmitting the corresponding PDSCH. For uplink transmissions from the UE, the network may also indicate to the UE which Tx beam of the UE to use. For example, for Physical Uplink Control Channel (PUCCH) transmission, the UE uses Tx beams indicated by the configuration of the network through spatial relationship information. For SRS transmission, the UE uses Tx beams indicated by the configuration of the network through spatial relationship information. For Physical Uplink Shared Channel (PUSCH) transmission, the UE uses Tx beams indicated by information elements contained in the scheduling DCI.

In operation associated with beam switching, the network uses this function to switch Tx beams for downlink or uplink transmissions. This function is useful when the Tx beam currently used for transmission is deactivated due to, for example, movement of the UE. When the network finds that the Tx beam currently used for downlink transmission is not good enough or the network finds that another Tx beam is better than the current Tx beam, the network may send signaling to the UE to inform it of the change of the Tx beam. Similarly, the network may switch the uplink Tx beam of the UE for transmitting certain uplink transmissions.

In a communication system such as a new air interface (NR) system, DL signals may include control signaling for transmitting DCI through a PDCCH, data signals for transmitting information packets through a PDSCH, and some types of reference signals. The DCI may indicate related information on how to transmit the PDSCH, including, for example, resource allocation and transmission parameters for the PDSCH. The network may send one or more types of reference signals for different purposes, including: demodulation reference symbols (DM-RS) that are transmitted with the PDSCH and may be used by the UE to demodulate the PDSCH; a channel state information reference signal (CSI-RS) that may be used by the UE to measure CSI of a Tx beam of the network or a downlink channel between the network and the UE; a phase tracking reference signal (PT-RS) that is also transmitted with the PDSCH and may be used by the UE to estimate phase noise caused by imperfections in the Radio Frequency (RF) parts of the transmitter and receiver, and then compensate for this noise when decoding the PDSCH. In NR, DL resource allocation is performed on PDCCH, PDSCH, and reference signals in units of Orthogonal Frequency Division Multiplexing (OFDM) symbols and a set of Physical Resource Blocks (PRBs). Each PRB contains several Resource Elements (REs), e.g., 12 REs, in the frequency domain. The transmission Bandwidth (BW) of one downlink transmission is composed of frequency resource units called Resource Blocks (RBs), and each RB is composed of several subcarriers or REs (e.g., 12 subcarriers or 12 REs).

The UL signal sent by the UE to the network may include: a data signal of a data packet is transmitted through a PUSCH, an uplink control signal transmitting UL Control Information (UCI) that can be transmitted in the PUSCH or PUCCH, and a UL reference signal. UCI may carry a Scheduling Request (SR) for a UE to request uplink transmission resources, hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for PDSCH transmission, or Channel State Information (CSI) reporting. The UE may send one or more types of uplink reference signals for different purposes, including: DM-RS, which is transmitted with PUSCH transmission and can be used by the network to demodulate PUSCH; PT-RS, which is also transmitted with PUSCH and can be used by the network to estimate phase noise caused by imperfections in the RF section, which can then be compensated for when decoding PUSCH; and SRS signals that may be used by the network to measure CSI for one or more UE Tx beams or uplink channels between the UE and the network. Similarly, UL resource allocation is performed on PUSCH, PUCCH, and UL reference signals in units of symbols and a set of PRBs.

The transmission interval of a DL or UL channel/signal is called a slot, each slot containing several (e.g. 14) symbols in the time domain. In an NR system, the duration of one slot may be 1, 0.5, 0.25, or 0.123 milliseconds for subcarrier spacings of 15KHz, 30KHz, 60KHz, and 120KHz, respectively. The NR system supports flexible parameter sets (numerology) and embodiments can select an appropriate OFDM subcarrier spacing based on deployment scenarios and service requirements. In an NR system, DL transmission and UL transmission may use different parameter sets.

In new air interface (NR) 3GPP release 15, beam indication is performed for PUCCH resources. For a given uplink partial Bandwidth (BWP) in the serving cell, 4 PUCCH resource sets may be configured for the UE, and in each PUCCH resource set, one or more PUCCH resources are configured for the UE. For transmission on each PUCCH resource, the UE is configured with the parameter PUCCH-spuialrationinfo, which may contain one or more reference signal resource IDs. Each of these reference signal resources is used to provide information about which transmit beam the UE can use to transmit on that PUCCH resource. For example, if the reference signal resource is a Sounding Reference Signal (SRS) resource, the UE may transmit on the PUCCH resource using the same Tx beam as used to transmit the SRS resource. If the reference signal resource is a channel state information reference signal (CSI-RS) resource or a synchronization signal/physical broadcast channel (SS/PBCH) block, the UE may transmit on the PUCCH resource using an uplink Tx beam corresponding to a reception beam for receiving the CSI-RS resource transmission or the SS/PBCH block transmission. The gNB may configure only one PUCCH-spuatialRelationInfo for the PUCCH resource. When the gNB wants to switch Tx beams of the PUCCH resource, the gNB may reconfigure Radio Resource Control (RRC) parameters. The gNB may also configure a plurality of PUCCH-spuatilReconInfo for a PUCCH resource in RRC and then deactivate one of the configured PUCCH-spuatilReconInfo as a current Tx beam for the PUCCH resource using media access control element (MAC CE) signaling. If the gNB wants to switch the Tx beam of one PUCCH resource, the gNB can use one MAC CE message to indicate another PUCCH-splatilRecommendinfo for that PUCCH resource. The gNB may use the MAC CE message to indicate PUCCH-spuatialRelationInfo for each individual PUCCH resource. The advantage of this approach is the strong flexibility and enables the gNB to apply different Tx beams on different PUCCH resources.

For PUSCH scheduled by DCI format 0_0 on a cell, the UE may be requested to transmit the PUSCH according to a spatial relationship corresponding to a dedicated PUCCH resource having the smallest ID within UL BWP of the cell. In other words, if PUSCH transmission through DCI format 0_0 is scheduled for a UE in one UL BWP, the UE may transmit the PUSCH using a Tx beam configured for a PUCCH having the smallest PUCCH resource ID in the same UL BWP.

In 3GPP release 16, tx beam indication/update of PUCCH resources will be changed to per PUCCH group. In one UL BWP, all PUCCH resources may be divided into one group or two groups. One group use case is single TRP transmission, and two group use cases are multi TRP transmission. Each TRP may schedule PUSCH transmissions for a User Equipment (UE), and the UE may apply different Tx beams accordingly.

NR version 15 supports SRS transmission for uplink CSI acquisition, uplink beam management, and antenna switching. One or more SRS resource sets may be configured for the UE, and K+.1 SRS resources may be configured for the UE for each SRS resource set. The use cases are configured for each SRS resource set by higher layer parameters SRS-resource set. The purposes of the SRS resource set include: for codebook-based PUSCH transmission, for non-codebook-based PUSCH transmission, for beam management, and for antenna switching.

In 5G NR version 15, uplink power control for SRS transmission is supported. The power control of SRS transmission specified in release 15 is based on the partial power control method and the path loss between the UE and the serving gNB. In the current design, one or more SRS resource sets may be configured for one UE, each SRS resource set may be configured with K+.1 SRS resources. The uplink power control parameters are configured per SRS resource set. SRS resource set q _s The following power control parameters are configured: alpha (q) _s ): for SRS resource set q _s A configured path loss compensation factor; p (P) ₀ (q _s ): for SRS resource set q _s A configured open loop received power target; q _d : the pathloss reference signal, which is the SRS resource set q _s An index of configured CSI-RS resources or SS/PBCH blocks sent by the serving gNB; srs-PowerControlAdjust states: indicating whether the same power control adjustment state or separate power control adjustments for SRS and PUSCH transmissions may be used for SRS resource sets.

The UE measures CSI-RS resources or SS/PBCH blocks configured as path loss reference signals to calculate the path loss between the UE and the serving gNB. Then, the UE will aggregate q _s The transmit power of the transmission in SRS resources is calculated as:

In the prescribed method, open loop power control and closed loop power control are supported. Open loop power control for SRS transmission is based on path loss between the UE and the serving gNB based on measurements of downlink RS q configured for SRS resource sets _d Calculated by the method. Closed loop power control (parameter h) _b,f,c (i, l)) is based on the power adjustment command sent by the serving gNB. Individual closed loop power control for SRS is signaled by DCI format 2_3.

The UE may report a power headroom for SRS power control, as specified in release 15, which is referred to as a type 3PH report. One way to calculate the power headroom is for the UE to determine a type 3PH report based on the actual SRS transmission, as follows:

PH _{types 3b, f, c} (i,q _s )

＝P _CMAX,f,c (i)-{P _{O_SRS,b,f,c} (q _s )+10log ₁₀ (2 ^μ ·M _SRS,b,f,c (i))+α _SRS,b,f,c (q _s )·PL _b,f,c (q _d )+h _b,f,c (i)}。

Another method of calculating the power headroom of SRS transmission is for the UE to determine a type 3PH report based on the reference SRS transmission by using the power control parameter configured for the SRS resource set of SRS resource set id=0:

the PH report may be used by the secondary service gNB to determine a closed loop power adjustment value. It should be noted that the PH reporting here is based solely on the path loss between the UE and the serving gNB, as specified in release 15.

Fig. 1 illustrates a User Equipment (UE) 10 and a network 20 providing uplink power control for Sounding Reference Signal (SRS) transmission in accordance with embodiments of the present disclosure in some embodiments. The UE 10 may include a processor 11, a memory 12, and a transceiver 13. The network 20, such as a next generation node B (gNB), may include a processor 21, a memory 22, and a transceiver 23. The

processor

11 or 21 may be configured to implement the functions, processes and/or methods as set forth in the present description. Layers of the radio interface protocol may be implemented in the

processor

11 or 21. The memory 12 or 22 is operatively coupled to the

processor

11 or 21 and stores various information for operating the

processor

11 or 21. The

transceiver

13 or 23 is operatively coupled to the

processor

11 or 21, and the

transceiver

13 or 23 transmits and/or receives radio signals.

The

processor

11 or 21 may include an Application Specific Integrated Circuit (ASIC), other chipset, logic circuit, and/or data processing device. Memory 12 or 22 may include Read Only Memory (ROM), random Access Memory (RAM), flash memory, memory cards, storage media, and/or other storage devices. The

transceiver

13 or 23 may include baseband circuitry for processing radio frequency signals. When the embodiments are implemented in software, the techniques described herein may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. These modules may be stored in the memory 12 or 22 and executed by the

processor

11 or 21. The memory 12 or 22 may be implemented within the

processor

11 or 21 or external to the

processor

11 or 21, in which case the memory 12 or 22 can be communicatively coupled to the

processor

11 or 21 via various means as is known in the art.

In some embodiments, processor 11 is configured to be configured by network 20 with configuration information for SRS resources for positioning purposes. The configuration information includes power control parameters associated with the serving cell and power control parameters associated with the neighboring cell. The processor 11 is configured to determine a transmission power associated with the serving cell and a transmission power associated with the neighboring cell of SRS resources for positioning purposes based on the configuration information. The SRS transmission has enough transmit power to reach multiple neighbor cells to support reliable positioning measurements. Therefore, the positioning accuracy and reliability based on uplink measurement are improved.

In some embodiments, each of the power control parameters associated with the serving cell and the power control parameters associated with the neighboring cell comprises: target receiver power level, path loss compensation factor, and path loss reference signal. In some embodiments, the processor 11 is configured to measure the path loss of the serving cell and the path loss of the neighboring cell to determine the transmit power associated with the serving cell and the transmit power associated with the neighboring cell of the SRS resource for positioning purposes according to the configuration information. In some embodiments, the processor 11 is configured to determine the transmit power associated with the serving cell and the transmit power associated with the neighboring cell for SRS resources for positioning purposes according to the maximum pathloss scaled by the respective pathloss compensation factor. In some embodiments, the processor 11 is configured to calculate the transmit power associated with the serving cell and the transmit power associated with the neighboring cell from the configuration information after measuring the path loss of the serving cell and the path loss of the neighboring cell.

In some embodiments, the processor 11 is configured to determine the transmit power of SRS resource transmission for positioning purposes using the transmit power associated with the serving cell and the transmit power associated with the neighboring cell. In some embodiments, the processor 11 is configured to be requested by the network to determine and report a power headroom report for SRS resources for positioning purposes, and the power headroom report is calculated based on the path loss of the serving cell and the path loss of the neighboring cell. In some embodiments, the power headroom report is a type 4 power headroom report.

In some embodiments, the processor 21 is configured to configure configuration information for SRS resources for the User Equipment (UE) 10 for positioning purposes. The configuration information includes power control parameters associated with the serving cell and power control parameters associated with the neighboring cell. The processor 21 is configured to request the UE to determine a transmission power associated with the serving cell and a transmission power associated with the neighboring cell of SRS resources for positioning purposes from the configuration information. The SRS transmission has enough transmit (Tx) power to reach multiple neighbor cells to support reliable positioning measurements. Therefore, the positioning accuracy and reliability based on uplink measurement are improved.

In some embodiments, each of the power control parameters associated with the serving cell and the power control parameters associated with the neighboring cell comprises: target receiver power level, path loss compensation factor, and path loss reference signal. In some embodiments, the processor 21 is configured to request the UE 10 to measure the path loss of the serving cell and the path loss of the neighboring cell to determine the transmit power associated with the serving cell and the transmit power associated with the neighboring cell of the SRS resources for positioning purposes according to the configuration information. In some embodiments, the processor 21 is configured to request the UE 10 to determine the transmit power associated with the serving cell and the transmit power associated with the neighboring cell for SRS resources for positioning purposes from the maximum pathloss scaled by the respective pathloss compensation factors. In some embodiments, the processor 21 is configured to request the UE 10 to calculate the transmission power associated with the serving cell and the transmission power associated with the neighboring cell according to the configuration information after requesting the UE 10 to measure the path loss of the serving cell and the path loss of the neighboring cell.

In some embodiments, the processor 21 is configured to request the UE 10 to determine the transmit power of SRS resource transmission for positioning purposes using the transmit power associated with the serving cell and the transmit power associated with the neighboring cell. In some embodiments, the processor 21 is configured to request the UE 10 to determine and report a power headroom report for SRS resources for positioning purposes, the power headroom report being calculated based on the path loss of the serving cell and the path loss of the neighboring cell. In some embodiments, the power headroom report is a type 4 power headroom report.

Fig. 2 illustrates a method 200 of SRS transmission for a UE according to an embodiment of the present disclosure. The method 200 includes: block 210, configuring, by a network, configuration information of SRS resources for positioning purposes, wherein the configuration information includes power control parameters associated with a serving cell and power control parameters associated with neighboring cells; block 220 determines a transmit power associated with the serving cell and a transmit power associated with the neighbor cell for SRS resources for positioning purposes based on the configuration information. The SRS transmission has enough transmit power to reach multiple neighbor cells to support reliable positioning measurements. Therefore, the positioning accuracy and reliability based on uplink measurement are improved.

In some embodiments, the method further comprises: each of the power control parameters associated with the serving cell and the power control parameters associated with the neighboring cells includes: target receiver power level, path loss compensation factor, and path loss reference signal. In some embodiments, the method further comprises: the path loss of the serving cell and the path loss of the neighboring cell are measured to determine a transmit power associated with the serving cell and a transmit power associated with the neighboring cell of SRS resources for positioning purposes according to the configuration information. In some embodiments, the method further comprises: the transmit power associated with the serving cell and the transmit power associated with the neighbor cell of the SRS resource for positioning purposes are determined according to the maximum pathloss scaled by the respective pathloss compensation factors. In some embodiments, the method further comprises: after measuring the path loss of the serving cell and the path loss of the neighboring cell, the transmission power associated with the serving cell and the transmission power associated with the neighboring cell are calculated from the configuration information.

In some embodiments, the method further comprises: the transmit power of SRS resource transmission for positioning purposes is determined using the transmit power associated with the serving cell and the transmit power associated with the neighboring cell. In some embodiments, the method further comprises requesting, by the network, to determine and report a power headroom report for SRS resources for positioning purposes, the power headroom report being calculated based on the path loss of the serving cell and the path loss of the neighboring cell. In some embodiments, the power headroom report is a type 4 power headroom report.

Fig. 3 illustrates a method 300 of SRS transmission for a network in accordance with an embodiment of the present disclosure. The method 300 includes: block 310, configuring configuration information of SRS resources for a User Equipment (UE) for positioning purposes, wherein the configuration information includes power control parameters associated with a serving cell and power control parameters associated with neighboring cells; and block 320, requesting the UE to determine a transmit power associated with the serving cell and a transmit power associated with the neighboring cell for SRS resources for positioning purposes based on the configuration information. The SRS transmission has enough transmit power to reach multiple neighbor cells to support reliable positioning measurements. Therefore, the positioning accuracy and reliability based on uplink measurement are improved.

In some embodiments, each of the power control parameters associated with the serving cell and the power control parameters associated with the neighboring cell comprises: target receiver power level, path loss compensation factor, and path loss reference signal. In some embodiments, the method further comprises: the UE is requested to measure the path loss of the serving cell and the path loss of the neighboring cell to determine a transmit power associated with the serving cell and a transmit power associated with the neighboring cell of SRS resources for positioning purposes according to the configuration information. In some embodiments, the method further comprises: the requesting UE determines a transmit power associated with the serving cell and a transmit power associated with the neighboring cell for SRS resources for positioning purposes according to the maximum pathloss scaled by the respective pathloss compensation factors. In some embodiments, the method further comprises: after the requesting UE measures the path loss of the serving cell and the path loss of the neighboring cell, the requesting UE calculates a transmission power associated with the serving cell and a transmission power associated with the neighboring cell according to the configuration information.

In some embodiments, the method further comprises: the requesting UE uses the transmit power associated with the serving cell and the transmit power associated with the neighboring cell to determine the transmit power for SRS resource transmission for positioning purposes. In some embodiments, the method further comprises: the UE is requested to determine and report a power headroom report for SRS resources for positioning purposes, which is calculated based on the path loss of the serving cell and the path loss of the neighboring cell. In some embodiments, the power headroom report is a type 4 power headroom report.

In some embodiments of the present disclosure, transmission power control for SRS transmission for positioning is proposedIs a method of (2). In one embodiment, a set of SRS resources for positioning may be configured for a UE, and one or more SRS resources are configured for the UE in the set of SRS resources. For a given SRS resource, the UE may be configured with one or more of the following uplink power parameters: uplink power control parameters associated with the serving cell: target received power level P _0,s And a path loss compensation factor alpha _s The method comprises the steps of carrying out a first treatment on the surface of the A downlink Reference Signal (RS) RS _s Which is used by the UE to measure the path loss between the UE and the serving cell; for a first neighbor cell, uplink power control parameters associated with the first neighbor cell: target received power level P _0,n1 And a path loss compensation factor alpha _n1 The method comprises the steps of carrying out a first treatment on the surface of the Downlink RS _n1 Which is used by the UE to measure the path loss between the first neighboring cell and the UE; for a second neighboring cell, uplink power control parameters associated with the second neighboring cell: target received power level P _0,n2 And a path loss compensation factor alpha _n2 The method comprises the steps of carrying out a first treatment on the surface of the Downstream RSRS _n2 Which is used by the UE to measure the path loss between the second neighboring cell and the UE.

The UE may measure RS _s To obtain a path loss between the serving cell and the UE: PL (PL) _s . The UE may measure RS _n1 To obtain a path loss between the first neighboring cell and the UE: PL (PL) _n1 . The UE may measure RS _n2 To obtain a path loss between the second neighboring cell and the UE: PL (PL) _n2 . The UE may then transmit SRS resources for positioning with the following transmit powers: p (P) _{SRS, positioning} ＝f(PL _s ,α _s ,P _0,s ,PL _n1 ,α _n1 ,P _0,n1 ,PL _n2 ,α _n2 ,P _0,n2 )。

The detailed design of the function f () is described in the method presented in this disclosure. Fig. 4 illustrates a process of uplink power control for SRS transmission for positioning according to the method in the present disclosure. As shown in fig. 4, first, the positioning server at the network side may send configuration information of SRS resources for positioning to the UE. Each SRS resource is configured with an uplink power control parameter associated with a serving cell and uplink power control parameters associated with one or more neighboring cells. From the configuration information, the UE may identify a transmission configuration for SRS transmission for positioning. The UE may also identify the transmit power of SRS transmissions for positioning. The serving cell transmits a downlink RS configured as a path loss reference signal to the UE. The UE receives a downlink RS from the serving cell and measures the RSRP of the downlink RS. The UE then calculates the path loss of the serving cell based on the measured RSRP. The neighboring cell transmits a downlink RS configured as a path loss reference signal to the UE. The UE receives a downlink RS from a neighboring cell and measures RSRP (reference signal received power) of the downlink RS. The UE then calculates the path loss of the neighboring cells. The UE may then determine a transmit power for SRS transmission for positioning based on the path loss of both the serving cell and the neighboring cell and the uplink power control parameters associated with both the serving cell and the neighboring cell. The UE transmits SRS resources to the serving cell and the neighbor cells using the determined transmission power. The serving cell receives the SRS transmission from the UE and measures the results (e.g., time of arrival (TOA)) for the positioning measurement. The neighbor cell receives SRS transmissions from the UE and measures the results (e.g., TOA) for positioning measurements. The serving cell reports the TOA measurements to the location server. The neighboring cells report TOA measurements to the location server. The location server may then calculate the location of the UE based on the reported TOA measurements.

In one method of an embodiment, a UE receives configuration information for a first set of SRS resources configured for positioning. In the first set, K is more than or equal to 1 SRS resource is configured for the UE. The configuration information for the first set of SRS resources may be transmitted by a network server (e.g., NR positioning server). Configuration information for the first set of SRS resources may be transmitted by the serving cell. For the first set, one or more of the following parameters may be configured for the UE, where the parameters are used for uplink power control for SRS transmissions in SRS resources included in the first set. These parameters include: pcmax: the UE may apply maximum output power for SRS transmission for positioning; a set of parameters associated with a serving cell; a parameter set associated with a first neighboring cell and a parameter set associated with a second neighboring cell. The set of parameters associated with the serving cell includes: alphaServingCell: a path loss compensation factor for path loss of the serving cell; p0 ServiceContll: target received power of SRS transmission for positioning on TRP side of serving cell; pathlossreference rsservingcell: downlink CSI-RS or SS/PBCH of the serving cell providing the measurement for path loss calculation; ss-PBCH-BlockPowerServerCell: downlink transmission power of SS/PBCH in service cell; powerControlOffSetSS: the CSI-RS resources configured as pathlossreference rsservingcell are power offset relative to SS/PBCH.

The parameter set associated with the first neighbor cell includes: alphaneighbor cell: a path loss compensation factor for path loss of a neighboring cell; p0neighbor cell: target received power of SRS transmission for positioning on TRP side of neighboring cell; pathlossrreferring rsneighbor cell: the downlink CSI-RS or SS/PBCH of the neighboring cell providing the measurement for the path loss calculation, if SS/PBCH, provides the following parameters: ssb-PositionsInburst, ssb-periodicity, ssbSubcarrierSpacing and index of SS/PBCH block, if CSI-RS resource, the following configuration information is provided: resource allocation, slot position, RE mapping, sequence, antenna port number; ss-PBCH-BlockPowerNeighborCell: downlink transmission power of SS/PBCH in neighboring cells; powerControlOffSetSS: the CSI-RS resources configured as pathlossreference rsservingcell are power offset relative to SS/PBCH.

The parameter set associated with the second neighboring cell includes: alphaneighbor cell: a path loss compensation factor for path loss of a neighboring cell; p0neighbor cell: target received power of SRS transmission for positioning on TRP side of neighboring cell; pathlossrreferring rsneighbor cell: the downlink CSI-RS or SS/PBCH of the neighboring cell providing the measurement for the path loss calculation, if SS/PBCH, provides the following parameters: ssb-PositionsInburst, ssb-periodicity, ssbSubcarrierSpacing and index of SS/PBCH block, if CSI-RS resource, the following configuration information is provided: resource allocation, slot position, RE mapping, sequence, antenna port number; ss-PBCH-BlockPowerNeighborCell: downlink transmission power of SS/PBCH in neighboring cells; powerControlOffSetSS: the CSI-RS resources configured as pathlossreference rsservingcell are power offset relative to SS/PBCH.

In one example, a UE is configured with a set of uplink power control parameters for each neighboring cell. In another example, the UE is configured with some parameters common to all neighboring cells and some parameters specific to each neighboring cell. The configuration of the neighboring cell is exemplified by the parameter set of the neighboring cell. The parameter set includes: common parameters of all neighboring cells: alphaneighbor cell: a path loss compensation factor for path loss of a neighboring cell; p0neighbor cell: target received power of SRS transmission for positioning on TRP side of neighboring cell; for a first neighbor cell: pathlossrreferring rsneighbor cell: downlink CSI-RS or SS/PBCH of the neighboring cell providing the measurement for path loss calculation; for a second neighboring cell: pathlossrreferring rsneighbor cell: downlink CSI-RS or SS/PBCH of the neighboring cell providing the measurement for the path loss calculation.

In one method, the UE determines the SRS transmission power P of the first SRS resource for positioning as follows _{SRS, positioning} ：

Wherein: p (P) _CMAX Is the maximum output power configured by the UE, P ₀ Is the target received power provided by higher layer parameters, M _SRS Is the SRS bandwidth expressed in terms of the number of resource blocks in the first SRS resource for SRS transmission, μ is the SCS (subcarrier spacing) configuration, α _s Is a serving cell-associated path loss compensation factor, PL, provided by higher layer parameters _s Is a downlink pathloss estimate (in dB), α, calculated by the UE using an RS resource index configured as a pathloss reference signal associated with the serving cell _n1 Is a pathloss compensation factor associated with the first neighboring cell provided by higher layer parameters, PL _n1 Is a downlink pathloss estimate (in dB), α, calculated by the UE using an RS resource index configured as a pathloss reference signal associated with the first neighboring cell _n2 Is made up of higher layer parametersProviding a path loss compensation factor, PL, associated with a second neighboring cell _n2 Is a downlink pathloss estimate (in dB) calculated by the UE using an RS resource index configured as a pathloss reference signal associated with a second neighboring cell, h is a closed loop power control parameter for SRS transmission for positioning, which parameter may be updated by a closed loop power command sent by the serving cell.

In this method of an embodiment, the transmit power is calculated from the maximum value of the scaled path loss. This may ensure that the SRS transmission has sufficient power to reach the neighboring cell via the "worst" link. In one method of an embodiment, the UE determines an SRS transmission power P of a first SRS resource for positioning as follows _{SRS, positioning} ：

Wherein P is _CMAX Is the maximum output power configured by the UE, P _0,s Is a target received power associated with a serving cell, P, provided by higher layer parameters _0,n1 Is a target received power associated with a first neighboring cell provided by higher layer parameters, P _0,n2 Is the target received power associated with the second neighboring cell, M, provided by higher layer parameters _SRS Is the SRS bandwidth expressed in terms of the number of resource blocks in the first SRS resource for SRS transmission, μ is the SCS (subcarrier spacing) configuration, α _s Is a serving cell-associated path loss compensation factor, PL, provided by higher layer parameters _s Is a downlink pathloss estimate (in dB), α, calculated by the UE using an RS resource index configured as a pathloss reference signal associated with the serving cell _n1 Is a pathloss compensation factor associated with the first neighboring cell provided by higher layer parameters, PL _n1 Is a downlink pathloss estimate (in dB), α, calculated by the UE using an RS resource index configured as a pathloss reference signal associated with the first neighboring cell _n2 Is a path loss compensation factor associated with a second neighboring cell provided by higher layer parameters, PL _n2 Is used by the UE as being configured to be associated with a second neighboring cell Downlink pathloss estimate (in dB) calculated by RS resource index of the associated pathloss reference signal, h is a closed loop power control parameter for SRS transmission for positioning, which parameter can be updated by a closed loop power command sent by the serving cell. An advantage of the method of this embodiment is that each cell (serving cell and neighboring cell) has completely independent power control parameters in order to provide optimal flexibility.

In one method of an embodiment, the UE determines an SRS transmission power P of a first SRS resource for positioning as follows _{SRS, positioning} ：

Wherein: p (P) _CMAX Is the maximum output power configured by the UE, P _0,s Is a target received power associated with a serving cell, P, provided by higher layer parameters _0,n1 Is a target received power associated with a first neighboring cell provided by higher layer parameters, P _0,n2 Is the target received power associated with the second neighboring cell, M, provided by higher layer parameters _SRS Is the SRS bandwidth expressed in terms of the number of resource blocks in the first SRS resource for SRS transmission, μ is the SCS (subcarrier spacing) configuration, α _s Is a serving cell-associated path loss compensation factor, PL, provided by higher layer parameters _s Is a downlink pathloss estimate (in dB), α, calculated by the UE using an RS resource index configured as a pathloss reference signal associated with the serving cell _n1 Is a pathloss compensation factor associated with the first neighboring cell provided by higher layer parameters, PL _n1 Is a downlink pathloss estimate (in dB), α, calculated by the UE using an RS resource index configured as a pathloss reference signal associated with the first neighboring cell _n2 Is a path loss compensation factor associated with a second neighboring cell provided by higher layer parameters, PL _n2 Is a downlink pathloss estimate (in dB), h, calculated by the UE using an RS resource index configured as a pathloss reference signal associated with a second neighboring cell _s Is used for fixingClosed loop power control parameters for SRS transmission of bits, which parameters may be updated by closed loop power commands sent by the serving cell, h _n1 And h _n2 Is a closed loop power control parameter for the SRS transmission for positioning that may be updated based on closed loop power commands of the first neighboring cell and the second neighboring cell, respectively. Since there is no data connection between the UE and the neighboring cell, the closed loop power control command of the neighboring cell can be forwarded by the serving cell.

In one method of an embodiment, a path loss value PL associated with a first neighboring cell may be provided to a UE _ref,n1 . In order to determine the transmit power of SRS transmissions for positioning, the UE may be requested to include a configured path loss value PL when calculating the transmit power _ref,n1 . The UE does not need to measure the downlink RS to calculate the path loss between the first neighbor cell and the UE.

Fig. 5 illustrates a process of power headroom reporting according to an embodiment of the present disclosure. Fig. 5 illustrates that in some embodiments associated with a power headroom report, in one method of an embodiment, when a UE determines a type 3 power headroom report, the UE cannot calculate the power headroom report based on SRS transmissions in SRS resources configured for positioning. The reason for this approach is that uplink power control for SRS transmission for positioning considers path loss of both the serving cell and the neighboring cell, while uplink power control for SRS transmission for other purposes (e.g., beam management, codebook-based, non-codebook-based or antenna switching) only considers path loss of the serving cell. Thus, the power headroom calculated based on SRS transmissions for positioning will be different from the power headroom calculated based on SRS transmissions for other purposes.

In one embodiment, a UE may be requested to determine a power headroom report for SRS transmission for positioning and report the power headroom report to a serving cell. In one example, the power headroom report dedicated to SRS transmission for positioning may be referred to as a type 4 power headroom report.

In one method of an embodiment, a UE determines a type 4 power headroom report based on one SRS transmission for positioning use as:

PH _{SRS, positioning} ＝P _CMAX -{P ₀ +10log ₁₀ (2 ^μ ·M _SRS )+max(α _s ·PL _s ,α _n1 ·PL _n1 ,α _n2 ·PL _n2 )+h}[dB]。

The UE may determine the type 4 power headroom report based on an SRS reference for positioning purposes as: PH value _{SRS, positioning} ＝P _CMAX -{P ₀ +max(α _s ·PL _s ,α _n1 ·PL _n1 ,α _n2 ·PL _n2 )+h}[dB]。

Other alternatives for the UE to determine the type 4 power headroom report based on one SRS transmission for positioning purposes are: alternative example 1, alt1:

alternative example 2, alt2:

/>

if the UE uses the reference SRS transmission for positioning purposes to calculate a type 4 power headroom report, there are other alternatives: alt1:

Alt2：

if one set of SRS resources is configured for the UE to locate, the UE may determine a type 4 power headroom report using uplink power control parameters configured for the set of SRS resources when using the reference SRS transmission.

If the UE is configured with a set of SRS resources for locating two or more, the UE may determine a type 4 power headroom report using an uplink power control parameter configured for the SRS resource set with the smallest set ID when using the reference SRS transmission.

In summary, in some embodiments of the present disclosure, an uplink power control method for SRS transmission for positioning purposes is proposed. For SRS resources for positioning, a Network (NW) configures power control parameters for a serving cell and power control parameters for each neighboring cell, respectively, wherein the power control parameters include: target receiver power level p_0, path loss compensation factor alpha, and path loss reference signal. The UE measures the path loss of each cell and then determines the transmit power of SRS transmissions for positioning in combination with the power control parameters of the serving cell and the neighboring cells. One way to determine the transmit power is for the UE to use the maximum path loss scaled by the corresponding path loss compensation factor. One way to determine the transmit power is for the UE to first calculate the transmit power of the cells based on the power control parameters configured for each cell and the measured path loss, and then the UE uses the maximum of these transmit powers for transmission. The UE may also report the power headroom of the SRS for positioning. In the calculation of the power headroom, the UE takes into account the path loss of both the serving cell and the neighboring cell for which the power control parameters are configured.

In embodiments of the present disclosure, methods and apparatuses for uplink power control for Sounding Reference Signal (SRS) transmission for positioning purposes are provided that can improve positioning accuracy and reliability based on uplink measurements. Embodiments of the present disclosure are a combination of techniques/procedures that may be employed in 3GPP specifications to create end products. According to the method in some embodiments of the invention, the transmit power of one SRS transmission for positioning takes into account the path loss of the serving cell and the neighboring cells. An advantage is that SRS transmission has enough transmit (Tx) power to reach multiple neighbor cells to support reliable positioning measurements. Therefore, the positioning accuracy and reliability based on uplink measurement are improved.

Fig. 6 is a block diagram of an example system 700 for wireless communication according to an embodiment of the disclosure. The embodiments described herein may be implemented in a system using any suitably configured hardware and/or software. Fig. 6 illustrates a system 700 that includes Radio Frequency (RF) circuitry 710, baseband circuitry 720, application circuitry 730, memory/storage 740, display 750, camera 760, sensor 770, and input/output (I/O) interface 780 coupled to one another at least as shown.

Application circuitry 730 may include, but is not limited to, circuitry such as one or more single-core or multi-core processors. Processors may include any combination of general-purpose processors and special-purpose processors, such as graphics processors and application processors. The processor may be coupled with the memory/storage and configured to execute instructions stored in the memory/storage to enable various applications and/or operating systems to be run on the system.

Baseband circuitry 720 may include, but is not limited to, circuitry such as one or more single-core or multi-core processors. The processor may comprise a baseband processor. The baseband circuitry may handle various wireless control functions that are capable of communicating with one or more wireless networks through the RF circuitry. The wireless control functions may include, but are not limited to, signal modulation, encoding, decoding, radio frequency shifting, and the like. In some embodiments, the baseband circuitry may provide communications compatible with one or more wireless technologies. For example, in some embodiments, the baseband circuitry may support communication with an Evolved Universal Terrestrial Radio Access Network (EUTRAN) and/or other Wireless Metropolitan Area Networks (WMANs), wireless Local Area Networks (WLANs), wireless Personal Area Networks (WPANs). An embodiment in which the baseband circuitry is configured to support wireless communications for more than one wireless protocol may be referred to as a multi-mode baseband circuitry. In various embodiments, baseband circuitry 720 may include circuitry that operates with signals that are not strictly considered to be in baseband frequency. For example, in some embodiments, the baseband circuitry may include circuitry that operates with intermediate frequency signals between baseband frequencies and radio frequencies.

RF circuitry 710 may enable communication with a wireless network using modulated electromagnetic radiation through a non-solid medium. In various embodiments, the RF circuitry may include switches, filters, amplifiers, etc. to facilitate communication with the wireless network. In various embodiments, RF circuitry 710 may include circuitry that operates with signals that are not strictly considered to be at radio frequencies. For example, in some embodiments, RF circuitry may include circuitry that operates with intermediate frequency signals between baseband frequencies and radio frequencies.

In various embodiments, the transmitter circuitry, control circuitry, or receiver circuitry discussed above for a user equipment, eNB, or gNB may be implemented, in whole or in part, in one or more RF circuitry, baseband circuitry, and/or application circuitry. As used herein, "circuitry" may refer to, be part of, or comprise an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (shared, dedicated, or group) and/or memory (shared, dedicated, or group) that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable hardware components that provide the described functionality. In some embodiments, electronic device circuitry or functionality associated with the circuitry may be implemented by one or more software or firmware modules. In some embodiments, some or all of the constituent components of the baseband circuitry, application circuitry, and/or memory/storage may be implemented together on a system on a chip (SOC).

Memory/storage 740 may be used to load and store data and/or instructions, such as for the system. The memory/storage of an embodiment may include any combination of suitable volatile memory, such as Dynamic Random Access Memory (DRAM), and/or non-volatile memory, such as flash memory. In various embodiments, I/O interface 780 may include one or more user interfaces designed to enable a user to interact with the system and/or one or more peripheral component interfaces designed to enable peripheral components to interact with the system. The user interface may include, but is not limited to, a physical keyboard or keypad, a touchpad, a speaker, a microphone, and the like. Peripheral component interfaces may include, but are not limited to, non-volatile memory ports, universal Serial Bus (USB) ports, audio jacks, and power interfaces.

In various embodiments, the sensor 770 may comprise one or more sensing devices that are used to determine environmental conditions and/or location information related to the system. In some embodiments, the sensors may include, but are not limited to, gyroscopic sensors, accelerometers, proximity sensors, ambient light sensors, and positioning units. The positioning unit may also be part of or interact with baseband circuitry and/or RF circuitry to communicate with components of a positioning network, such as Global Positioning System (GPS) satellites. In various embodiments, display 750 may include displays such as liquid crystal displays and touch screen displays. In various embodiments, system 700 may be a mobile computing device such as, but not limited to, a laptop device, a tablet computing device, a netbook, a superbook, a smartphone, and the like. In various embodiments, the system may have more or fewer components and/or different architectures. The methods described herein may be implemented in a computer program where appropriate. The computer program may be stored on a storage medium such as a non-transitory storage medium.

Those of ordinary skill in the art will appreciate that each of the units, algorithms, and steps described and disclosed in the embodiments of the disclosure are implemented using electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Those of ordinary skill in the art may implement the described functionality using different approaches for each particular application, but such implementation is not to be considered as beyond the scope of the embodiments of the present disclosure. Those of ordinary skill in the art will appreciate that the specific operation of the systems, devices, and units of the above-described embodiments may refer to the corresponding systems, devices, and units of the above-described method embodiments because they are substantially identical. For convenience and brevity of description, these working processes are not described in detail herein.

It should be understood that the systems, devices, and methods disclosed in the embodiments of the present disclosure may be implemented in other ways. The above-described embodiments are merely exemplary. The division of the cells is based solely on logical functional division, and there may be additional ways of dividing in implementation. Multiple units or components may be combined or may be integrated into another system. Certain features may be omitted or skipped. On the other hand, the coupling or direct coupling or communication connection shown or discussed with respect to each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units illustrated as separate components may or may not be physically separate. The units for display are or are not physical units, i.e. may be located in one place or may be distributed over a plurality of network units. Some or all of the units are used according to the purpose of the embodiment. In addition, each functional unit in each embodiment may be integrated in one processing unit, may physically exist alone, or may be integrated in one processing unit.

If the software functional unit is implemented, used and sold in the form of a product, the functional unit may be stored in a computer-readable storage medium. Based on such understanding, the technical solutions proposed by the present disclosure may be implemented in the form of a software product, either in whole or in part. Alternatively, the parts of the technical solution that contribute to the prior art may be implemented in the form of software products. The computer software product is stored in a storage medium comprising several instructions that cause a computing device (such as a personal computer, a server, or a network device) to perform all or part of the steps disclosed in embodiments of the present disclosure. The storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a floppy disk, or other type of medium upon which program code may be stored.

While the present disclosure has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the present disclosure is not limited to the disclosed embodiment, but is intended to cover various arrangements made without departing from the scope of the appended claims in its broadest interpretation.

Claims

1. A method for uplink power control for Sounding Reference Signal (SRS) transmission by a User Equipment (UE), comprising:

configuring configuration information of SRS resources for positioning purposes through a network, wherein the configuration information comprises power control parameters associated with a serving cell and power control parameters associated with adjacent cells; and

determining a transmission power associated with the serving cell and a transmission power associated with the neighboring cell of the SRS resource for positioning purposes according to the configuration information;

wherein each of the power control parameters associated with the serving cell and the power control parameters associated with the neighboring cell includes a target receiver power level, a path loss compensation factor, and a path loss reference signal;

the method further comprises the steps of: a transmit power associated with the serving cell and a transmit power associated with the neighbor cell of the SRS resource for positioning purposes are determined according to a maximum pathloss scaled by a respective pathloss compensation factor.

2. The method of claim 1, further comprising: the path loss of the serving cell and the path loss of the neighboring cell are measured to determine a transmit power associated with the serving cell and a transmit power associated with the neighboring cell of the SRS resource for positioning purposes according to the configuration information.

3. The method of claim 1, further comprising: after measuring the path loss of the serving cell and the path loss of the neighboring cell, a transmit power associated with the serving cell and a transmit power associated with the neighboring cell are calculated from the configuration information.

4. A method according to claim 3, further comprising: a transmit power of the SRS resource transmission for positioning purposes is determined using a transmit power associated with the serving cell and a transmit power associated with the neighbor cell.

5. The method of any one of claims 1 to 4, further comprising: a power headroom report for the SRS resource for positioning purposes is determined and reported by the network request and calculated based on both the path loss of the serving cell and the path loss of the neighboring cell.

6. A User Equipment (UE) for uplink power control for Sounding Reference Signal (SRS) transmission, comprising:

a memory;

a transceiver; and

a processor coupled to the memory and the transceiver,

wherein the processor is configured to:

the processor is further configured to: the transmit power associated with the serving cell and the transmit power associated with the neighbor cell of SRS resources for positioning purposes are determined according to the maximum pathloss scaled by the respective pathloss compensation factors.

7. The UE of claim 6, wherein the processor is configured to: the path loss of the serving cell and the path loss of the neighboring cell are measured to determine a transmit power associated with the serving cell and a transmit power associated with the neighboring cell of the SRS resource for positioning purposes according to the configuration information.

8. The UE of claim 6, wherein the processor is configured to: after measuring the path loss of the serving cell and the path loss of the neighboring cell, a transmit power associated with the serving cell and a transmit power associated with the neighboring cell are calculated from the configuration information.

9. The UE of claim 8, wherein the processor is configured to: a transmit power of the SRS resource transmission for positioning purposes is determined using a transmit power associated with the serving cell and a transmit power associated with the neighbor cell.

10. The UE of any of claims 6 to 9, wherein the processor is configured to: a power headroom report for the SRS resource for positioning purposes is determined and reported by the network request and calculated based on both the path loss of the serving cell and the path loss of the neighboring cell.

11. A method for uplink power control for Sounding Reference Signal (SRS) transmission of a network, comprising:

configuring configuration information of SRS resources for positioning purposes for User Equipment (UE), wherein the configuration information comprises power control parameters associated with a serving cell and power control parameters associated with neighboring cells; and

requesting the UE to determine a transmission power associated with the serving cell and a transmission power associated with the neighboring cell of the SRS resource for positioning purposes according to the configuration information;

the method further comprises the steps of: the UE is requested to determine a transmit power associated with the serving cell and a transmit power associated with the neighbor cell for the SRS resources for positioning purposes according to a maximum pathloss scaled by a respective pathloss compensation factor.

12. The method of claim 11, further comprising: requesting the UE to measure a path loss of the serving cell and a path loss of the neighbor cell to determine a transmit power associated with the serving cell and a transmit power associated with the neighbor cell of the SRS resource for positioning purposes according to the configuration information.

13. The method of claim 11, further comprising: after requesting the UE to measure the path loss of the serving cell and the path loss of the neighboring cell, requesting the UE to calculate a transmission power associated with the serving cell and a transmission power associated with the neighboring cell according to the configuration information.

14. The method of claim 13, further comprising: the UE is requested to determine a transmit power of the SRS resource transmission for positioning purposes using a transmit power associated with the serving cell and a transmit power associated with the neighboring cell.

15. The method of any of claims 11 to 14, further comprising: the UE is requested to determine and report a power headroom report for the SRS resource for positioning purposes, and the power headroom report is calculated based on both the path loss of the serving cell and the path loss of the neighboring cell.

16. A network for uplink power control for Sounding Reference Signal (SRS) transmission, comprising:

a memory;

a transceiver; and

a processor coupled to the memory and the transceiver,

wherein the processor is configured to:

the processor is further configured to: the UE is requested to determine a transmit power associated with the serving cell and a transmit power associated with the neighbor cell for SRS resources for positioning purposes according to a maximum pathloss scaled by a respective pathloss compensation factor.

17. The network of claim 16, wherein the processor is configured to: requesting the UE to measure a path loss of the serving cell and a path loss of the neighbor cell to determine a transmit power associated with the serving cell and a transmit power associated with the neighbor cell of the SRS resource for positioning purposes according to the configuration information.

18. The network of claim 16, wherein the processor is configured to: after requesting the UE to measure the path loss of the serving cell and the path loss of the neighboring cell, requesting the UE to calculate a transmission power associated with the serving cell and a transmission power associated with the neighboring cell according to the configuration information.

19. The network of claim 18, wherein the processor is configured to: the UE is requested to determine a transmit power of the SRS resource transmission for positioning purposes using a transmit power associated with the serving cell and a transmit power associated with the neighboring cell.

20. The network of any of claims 16 to 19, wherein the processor is configured to: the UE is requested to determine and report a power headroom report for the SRS resource for positioning purposes, and the power headroom report is calculated based on both the path loss of the serving cell and the path loss of the neighboring cell.

21. A non-transitory machine-readable storage medium having instructions stored thereon, which when executed by a computer, cause the computer to perform the method of any of claims 1 to 5 and 11 to 15.

22. A terminal device, comprising: a processor and a memory for storing a computer program, the processor being configured to execute the computer program stored in the memory to implement the method according to any one of claims 1 to 5.

23. A network node, comprising: a processor and a memory for storing a computer program, the processor being configured to execute the computer program stored in the memory to implement the method of any one of claims 11 to 15.