WO2021012586A1 - Procédés et appareils de régulation de la puissance de liaison montante pour la transmission d'un signal de référence de sondage - Google Patents

Procédés et appareils de régulation de la puissance de liaison montante pour la transmission d'un signal de référence de sondage Download PDF

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Publication number
WO2021012586A1
WO2021012586A1 PCT/CN2019/124906 CN2019124906W WO2021012586A1 WO 2021012586 A1 WO2021012586 A1 WO 2021012586A1 CN 2019124906 W CN2019124906 W CN 2019124906W WO 2021012586 A1 WO2021012586 A1 WO 2021012586A1
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WIPO (PCT)
Prior art keywords
path loss
transmit power
serving cell
neighbor cell
cell
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PCT/CN2019/124906
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English (en)
Inventor
Li Guo
Original Assignee
Guangdong Oppo Mobile Telecommunications Corp., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Guangdong Oppo Mobile Telecommunications Corp., Ltd. filed Critical Guangdong Oppo Mobile Telecommunications Corp., Ltd.
Priority to CN201980008011.5A priority Critical patent/CN112534891B/zh
Publication of WO2021012586A1 publication Critical patent/WO2021012586A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/27—Monitoring; Testing of receivers for locating or positioning the transmitter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/246—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters where the output power of a terminal is based on a path parameter calculated in said terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/32—TPC of broadcast or control channels
    • H04W52/325—Power control of control or pilot channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/365—Power headroom reporting

Definitions

  • the present disclosure relates to the field of communication systems, and more particularly, to methods and apparatuses of uplink power control for a sounding reference signal (SRS) transmission.
  • SRS sounding reference signal
  • a shortcoming of current power control method on a sounding reference signal (SRS) transmission is that hearability of transmission of SRS for positioning could be impaired and the transmission of SRS for positioning might not be received with good quality by some neighbor cell, thus the performance UE positioning based on uplink signal measurement, for example uplink relative time of arrival (RTOA) is degraded.
  • SRS sounding reference signal
  • the transmit power for an SRS transmission is only based on path loss between a user equipment (UE) and a network such as a serving a next generation node B (gNB) , while the path loss to a neighbor cell is not taken into account.
  • UE user equipment
  • gNB next generation node B
  • neighbor cell is more far from the UE than the serving gNB and thus the path loss between neighbor cell and the UE is larger than that of the serving gNB.
  • the transmit power of SRS transmission based on current method would be too small to reach the neighbor cell to be received properly.
  • Positioning based on uplink RTOA method relies on measuring SRS transmission from one UE by multiple cells, including the serving cell and multiple neighbor cells. The current method impairs the hearability of SRS positioning at the side of neighbor cells and reduce the number of neighbor cells that is able to detect the SRS transmission properly. The consequence is the performance of UE positioning service is impaired.
  • An object of the present disclosure is to propose methods and apparatuses of uplink power control for a sounding reference signal (SRS) transmission for positioning purpose capable of improving positioning accuracy and reliability based on uplink measurement.
  • SRS sounding reference signal
  • a method of uplink power control for a sounding reference signal (SRS) transmission of a user equipment (UE) includes being configured, by a network, with configuration information for an SRS resource used for positioning purpose, wherein the configuration information comprises power control parameters associated with a serving cell and power control parameters associated with a neighbor cell and determining a transmit power associated with the serving cell and a transmit power associated with the neighbor cell for the SRS resource used for positioning purpose according to the configuration information.
  • SRS sounding reference signal
  • a user equipment (UE) of uplink power control for a sounding reference signal (SRS) transmission includes a memory, a transceiver, and a processor coupled to the memory and the transceiver.
  • the processor is configured to be configured, by a network, with configuration information for an SRS resource used for positioning purpose, wherein the configuration information comprises power control parameters associated with a serving cell and power control parameters associated with a neighbor cell, and the processor is configured to determine a transmit power associated with the serving cell and a transmit power associated with the neighbor cell for the SRS resource used for positioning purpose according to the configuration information.
  • a method of uplink power control for a sounding reference signal (SRS) transmission of a network includes configuring, to a user equipment (UE) , configuration information for an SRS resource used for positioning purpose, wherein the configuration information comprises power control parameters associated with a serving cell and power control parameters associated with a neighbor cell, and requesting the UE to determine a transmit power associated with the serving cell and a transmit power associated with the neighbor cell for the SRS resource used for positioning purpose according to the configuration information.
  • SRS sounding reference signal
  • a network of uplink power control for a sounding reference signal (SRS) transmission includes a memory, a transceiver, and a processor coupled to the memory and the transceiver.
  • the processor is configured to configure, to a user equipment (UE) , configuration information for an SRS resource used for positioning purpose, wherein the configuration information comprises power control parameters associated with a serving cell and power control parameters associated with a neighbor cell, and the processor is configured to request the UE to determine a transmit power associated with the serving cell and a transmit power associated with the neighbor cell for the SRS resource used for positioning purpose according to the configuration information.
  • UE user equipment
  • a non-transitory machine-readable storage medium has stored thereon instructions that, when executed by a computer, cause the computer to perform the above method.
  • a terminal device includes a processor and a memory configured to store a computer program.
  • the processor is configured to execute the computer program stored in the memory to perform the above method.
  • a network node includes a processor and a memory configured to store a computer program.
  • the processor is configured to execute the computer program stored in the memory to perform the above method.
  • FIG. 1 is a block diagram of a user equipment (UE) and a network of an SRS transmission according to an embodiment of the present disclosure.
  • UE user equipment
  • FIG. 2 is a flowchart illustrating a method of an SRS transmission of a UE according to an embodiment of the present disclosure.
  • FIG. 3 is a flowchart illustrating a method of an SRS transmission of a network according to an embodiment of the present disclosure.
  • FIG. 4 illustrates a procedure of uplink power control on SRS transmission for positioning according to an embodiment of the present disclosure.
  • FIG. 5 illustrates a procedure of a power headroom report according to an embodiment of the present disclosure.
  • FIG. 6 is a block diagram of a system for wireless communication according to an embodiment of the present disclosure.
  • Fifth-generation (5G) wireless systems are generally a multi-beam based system in a frequency range 2 (FR2) ranging from 24.25 GHz to 52.6 GHz, where multiplex transmit (Tx) and receive (Rx) analog beams are employed by a network and/or a user equipment (UE) to combat a large path loss in a high frequency band.
  • FR2 frequency range 2
  • UE user equipment
  • Tx and Rx multiplex transmit
  • Rx user equipment
  • the network and the UE are deployed with large number of antennas, so that a large gain beamforming can be used to defeat the large path loss and signal blockage.
  • Due to the hardware limitation and cost the network and the UE might only be equipped with a limited number of transmission and reception units (TXRUs) .
  • TXRUs transmission and reception units
  • hybrid beamforming mechanisms can be utilized in both network and UE.
  • the network and the UE need to align analog beam directions for a particular downlink or uplink transmission.
  • the network and the UE need to find the best pair of a network Tx beam and a UE Rx beam while for an uplink transmission, the network and the UE need to find the best pair of the UE Tx beam and the network Rx beam.
  • the network and the UE For a communication between one UE and a network, the network and the UE need to determine which Tx and Rx beam are going to be used. When one UE moves, the beams used by the network and the UE for communication might change.
  • 3GPP 3rd generation partnership project
  • the UE can measure one or multiple Tx beams of the network and then the UE can select the best Tx beam and report his selection to the network.
  • the UE can also measure one or more different Rx beams and then select the best Rx beam for one particular Tx beam of the network.
  • the gNB can also measure one or multiple Tx beams of the UE and then select the best Tx beam of the UE for an uplink transmission.
  • the network can transmit multiple reference signal (RS) resources and then configures the UE to measure the RS resources.
  • RS reference signal
  • the UE can report an index of one or more selected RS resources that are selected based on some measure metric, for example, a layer 1 reference signal received power (L1-RSRP) .
  • L1-RSRP layer 1 reference signal received power
  • the network can configure the UE to transmit one or more uplink RS resources, for example, sounding reference signal (SRS) resources, and then the network can measure the RS resources.
  • SRS sounding reference signal
  • the network can figure out which Tx beam of the UE is the best for the uplink transmission based on measuring, for example, L1-RSRP of the RS resources.
  • the network can indicate the UE of which Tx beam of the network is used to transmit, so that the UE can use proper Rx beam to receive the downlink transmission.
  • the network can indicate an identify (ID) of one Tx beam of the network to the UE.
  • the network can use downlink control information (DCI) in a PDCCH to indicate the ID of one Tx beam that is used to transmit a corresponding PDSCH.
  • DCI downlink control information
  • the network can also indicate the UE of which Tx beam of the UE to be used.
  • the UE uses a Tx beam that is indicated by the network through a configuration of spatial relation information.
  • the UE uses the Tx beam that is indicated by the network through the configuration of spatial relation information.
  • the UE uses a Tx beam that indicated by an information element contained in a scheduling DCI.
  • this function is used by the network to switch a Tx beam used for a downlink or uplink transmission. This function is useful when the Tx beam used for transmission currently is out of date due to for example a movement of the UE.
  • the network can send signaling to the UE to inform a change of Tx beam.
  • the network can switch an uplink Tx beam of the UE used to transmit some uplink transmission.
  • DL signals can include control signaling conveying DCI through a PDCCH, data signals conveying information packet through a PDSCH and some types of reference signals.
  • the DCI can indicate information of how the PDSCH is transmitted, including for example resource allocation and transmission parameters for the PDSCH.
  • the network can transmit one or more types of reference signals for different purposes, including a demodulation reference symbol (DM-RS) that is transmitted along with the PDSCH and can be used by the UE to demodulate the PDSCH, a channel state information reference signal (CSI-RS) that can be used by the UE to measure network’s Tx beam or CSI of a downlink channel between the network and the UE, a phase tracking reference signal (PT-RS) that is also transmitted along with a PDSCH and can be used by the UE to estimate a phase noise caused by imperfection in a radio frequency (RF) part in a transmitter and a receiver and then compensate it when decoding the PDSCH.
  • DM-RS demodulation reference symbol
  • CSI-RS channel state information reference signal
  • PT-RS phase tracking reference signal
  • DL resource allocation for PDCCH, PDSCH, and reference signals is performed in a unit of orthogonal frequency division multiplexing (OFDM) symbols and a group of physical resource blocks (PRBs) .
  • Each PRB contains a few resource elements (REs) , for example 12 REs, in a frequency domain.
  • a transmission bandwidth (BW) of one downlink transmission consists of frequency resource unit called as resource blocks (RBs) and each RB consists of a few subcarriers or REs, for example, 12 subcarriers or 12 REs.
  • UL signals transmitted by the UE to the network can include data signals conveying data packet through a PUSCH, uplink control signals conveying UL control information (UCI) which can be transmitted in the PUSCH or a PUCCH, and UL reference signals.
  • the UCI can carry a schedule request (SR) used by the UE to request an uplink transmission resource, a hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for a PDSCH transmission or a channel state information (CSI) report.
  • SR schedule request
  • HARQ-ACK hybrid automatic repeat request acknowledgement
  • CSI channel state information
  • the UE can transmit one or more types of uplink reference signals for different purposes, including DM-RS that is transmitted along with a PUSCH transmission and can be used by the network to demodulate the PUSCH, PT-RS that is also transmitted along with a PUSCH and can be used by the network to estimate the phase noise caused by imperfection in RF parts and the network then can compensate it when decoding PUSCH, and SRS signals that are used by the network to measure one or more UE Tx beams or CSI of the uplink channel between the UE and the network.
  • UL resource allocation for PUSCH, PUCCH, and UL reference signal is also performed in a unit of symbols and a group of PRBs.
  • a transmission interval for DL or UL channels/signals is referred to as a slot and each slot contains a few, for example 14, symbols in time domain.
  • the duration of one slot can be 1, 0.5, 0.25 or 0.123 millisecond, for the subcarrier spacing 15KHz, 30KHz, 60KHz, and 120 KHz, respectively.
  • NR systems support flexible numerologies and an embodiment can choose proper OFDM subcarrier spacing based on the deployment scenario and service requirement. In the NR system, DL and UL transmission can use different numerologies.
  • a beam indication is conducted per PUCCH resource.
  • a UE For a given uplink bandwidth part (BWP) in a serving Cell, a UE can be configured with 4 PUCCH resource set and in each PUCCH resource set, the UE is configured with one or more PUCCH resources.
  • the UE For a transmission on each PUCCH resource, the UE is configured with a parameter PUCCH-spatialRelationInfo, which can contain one or more reference signal resource ID (s) .
  • PUCCH-spatialRelationInfo can contain one or more reference signal resource ID (s) .
  • Each of those reference signal resource is used to provide information on which transmit beam the UE can use for the transmission on that PUCCH resource.
  • the UE can use the same Tx beam used to transmit that SRS resource on the transmission on that PUCCH resource.
  • the reference signal resource is a channel state information reference signal (CSI-RS) resource or synchronization signal/physical broadcast channel (SS/PBCH) block
  • the UE can use the uplink Tx beam corresponding to the receive beam used to receive the CSI-RS resource transmission or SS/PBCH block transmission on the transmission on that PUCCH resource.
  • CSI-RS channel state information reference signal
  • SS/PBCH synchronization signal/physical broadcast channel
  • a gNB can configure only one PUCCH-spatialRelationInfo to a PUCCH resource and when the gNB wants to switch the Tx beam of that PUCCH resource, the gNB can re-configure a radio resource control (RRC) parameter.
  • the gNB can also configure multiple PUCCH-spatialRelationInfo to a PUCCH resource in RRC and then use medium access control control element (MAC CE) signaling to activate one of those configured PUCCH-spatialRelationInfo as the current Tx beam for that PUCCH resource.
  • RRC radio resource control
  • MAC CE medium access control control element
  • the gNB wants to switch the Tx beam of one PUCCH resource, the gNB can use one MAC CE message to indicate another PUCCH-spatialRelationInfo for that PUCCH resource.
  • the gNB can use MAC CE message to indicate the PUCCH-spatialRelationInfo for each individual PUCCH resource.
  • the UE For PUSCH scheduled by DCI format 0_0 on a cell, the UE can be requested to transmit that PUSCH according to the spatial relation corresponding to the dedicated PUCCH resources with the lowest ID within the UL BWP of the cell. In other word, if the UE is scheduled with a PUSCH transmission by a DCI format 0_0 in one UL BWP, the UE can use the Tx beam configured to the PUCCH with lowest PUCCH resource ID in the same UL BWP to transmit that PUSCH.
  • the Tx beam indication/updating for PUCCH resource will be changed to per PUCCH group.
  • all the PUCCH resource can be divided into one or two groups.
  • Use case for one group is single TRP transmission and use case for two group is multi-TRP transmission. Every TRP can schedule a PUSCH transmission for a user equipment (UE) and the UE can apply different Tx beam accordingly.
  • UE user equipment
  • NR release 15 supports SRS transmission for uplink CSI acquisition, uplink beam management and antenna switching.
  • a UE can be configured with one or more SRS resource sets and for each SRS resource set, the UE can be configured with K ⁇ 1 SRS resources. Every SRS resource set is configured with a use case through a higher layer parameter SRS-ResourceSet.
  • the usage of SRS resource set includes: for codebook based PUSCH transmission, for non-codebook based PUSCH transmission, for beam management, and for antenna switching.
  • uplink power control on SRS transmission is supported.
  • the power control on SRS transmission specified in release 15 is based on the method of fractional power control and the path loss between the UE and the serving gNB.
  • one UE can be configured with one or more SRS resource set and each SRS resource set can be configured with K ⁇ 1 SRS resources.
  • Uplink power control parameters are configured per SRS resource set.
  • One SRS rescore set q s is configured the following power control parameters: ⁇ (q s ) : path loss compensation factor configured for the SRS resource set q s .
  • P 0 (q s ) open-loop receive power target configured for the SRS resource set q s .
  • q d pathloss reference signal, it is one index of a CSI-RS resource or SS/PBCH block transmitted by the serving gNB configured for the SRS resource set q s .
  • Srs-PowerControlAdjustmentStates to indicate whether same power control adjustment state for SRS and PUSCH transmission or separate power control adjustment can be used for the SRS resource set.
  • the UE measures the CSI-RS resource or SS/PBCH block configured as path loss reference signal to calculate the path loss between the UE and the serving gNB. Then the UE calculates the transmit power for transmission in an SRS resource in the set q s as:
  • Open-loop power control on SRS transmission is based on the path loss between the UE and the serving gNB that is calculated based on measuring downlink RS q d configured to the SRS resource set.
  • Close-loop power control (the parameter h b, f, c (i, l) ) is based on the power adjust command sent by the serving gNB.
  • Separate close-loop power control for SRS is signaled through DCI format 2_3.
  • the UE can report power headroom for SRS power control, called Type 3 PH report as specified in release 15.
  • One method to calculate power headroom is the UE determines a Type 3 PH report based on an actual SRS transmission as follows:
  • PH type3, b, f, c (i, q s ) P CMAX, f, c (i) - ⁇ P O_SRS, b, f, c (q s ) +10log 10 (2 ⁇ ⁇ M SRS, b, f, c (i) ) + ⁇ SRS, b, f, c (q s ) ⁇ PL b, f, c (q d ) +h b, f, c (i) ⁇
  • the PH report can be used to assist the serving gNB to determine the close-loop power adjustment values. Please note here the PH report is only based on the path loss between the UE and the serving gNB, as specified in release 15.
  • FIG. 1 illustrates that, in some embodiments, a user equipment (UE) 10 and a network 20 of uplink power control for a sounding reference signal (SRS) transmission according to an embodiment of the present disclosure are provided.
  • 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 proposed functions, procedures and/or methods described in this description. Layers of radio interface protocol may be implemented in the processor 11 or 21.
  • the memory 12 or 22 is operatively coupled with the processor 11 or 21 and stores a variety of information to operate the processor 11 or 21.
  • the transceiver 13 or 23 is operatively coupled with the processor 11 or 21, and the transceiver 13 or 23 transmits and/or receives a radio signal.
  • the processor 11 or 21 may include an application-specific integrated circuit (ASIC) , other chipsets, logic circuit and/or data processing devices.
  • the memory 12 or 22 may include a read-only memory (ROM) , a random access memory (RAM) , a flash memory, a memory card, a storage medium and/or other storage devices.
  • the transceiver 13 or 23 may include baseband circuitry to process radio frequency signals.
  • modules e.g., procedures, functions, and so on
  • the modules can be stored in the memory 12 or 22 and executed by the processor 11 or 21.
  • the memory 12 or 22 can be implemented within the processor 11 or 21 or external to the processor 11 or 21, in which those can be communicatively coupled to the processor 11 or 21 via various means are known in the art.
  • the processor 11 is configured to be configured, by the network 20, with configuration information for an SRS resource used for positioning purpose, wherein the configuration information comprises power control parameters associated with a serving cell and power control parameters associated with a neighbor cell, and the processor 11 is configured to determine a transmit power associated with the serving cell and a transmit power associated with the neighbor cell for the SRS resource used for positioning purpose according to the configuration information.
  • the SRS transmission has enough transmit power to reach multiple neighbor cells to support reliable positioning measurement. Thus, positioning accuracy and reliability based on uplink measurement is improved.
  • each of the power control parameters associated with the serving cell and the power control parameters associated with the neighbor cell comprises a target receiver power level, a path loss compensation factor, and a path loss reference signal.
  • the processor 11 is configured to measure path loss of the serving cell and path loss of the neighbor cell to determine the transmit power associated with the serving cell and the transmit power associated with the neighbor cell for the SRS resource used for positioning purpose according to the configuration information.
  • the processor 11 is configured to determine the transmit power associated with the serving cell and the transmit power associated with the neighbor cell for the SRS resource used for positioning purpose according to a largest path loss scaled by a corresponding path loss compensation factor.
  • the processor 11 is configured to calculate the transmit power associated with the serving cell and the transmit power associated with the neighbor cell according to the configuration information after measuring path loss of the serving cell and path loss of the neighbor cell.
  • the processor 11 is configured to use a transmit power associated with the serving cell and a transmit power associated with the neighbor cell to determine the transmit power for a transmission of the SRS resource used for positioning purpose. In some embodiments, the processor 11 is configured to be requested, by the network, to determine and report a power headroom report for the SRS resource used for positioning purpose and the power headroom report is calculated based on both path loss of serving cell and path loss of neighbor cell. In some embodiments, the power headroom report is a type 4 power headroom report.
  • the processor 21 is configured to configure, to the user equipment (UE) 10, configuration information for an SRS resource used for positioning purpose, wherein the configuration information comprises power control parameters associated with a serving cell and power control parameters associated with a neighbor cell, and the processor 21 is configured to request the UE to determine a transmit power associated with the serving cell and a transmit power associated with the neighbor cell for the SRS resource used for positioning purpose according to the configuration information.
  • the SRS transmission has enough transmit (Tx) power to reach multiple neighbor cells to support reliable positioning measurement. Thus, positioning accuracy and reliability based on uplink measurement is improved.
  • each of the power control parameters associated with the serving cell and the power control parameters associated with the neighbor cell comprises a target receiver power level, a path loss compensation factor, and a path loss reference signal.
  • the processor 21 is configured to request the UE 10 to measure path loss of the serving cell and path loss of the neighbor cell to determine the transmit power associated with the serving cell and the transmit power associated with the neighbor cell for the SRS resource used for positioning purpose according to the configuration information.
  • 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 neighbor cell for the SRS resource used for positioning purpose according to a largest path loss scaled by a corresponding path loss compensation factor.
  • the processor 21 is configured to request the UE 10 to calculate the transmit power associated with the serving cell and the transmit power associated with the neighbor cell according to the configuration information after requesting the UE 10 to measure path loss of the serving cell and path loss of the neighbor cell.
  • the processor 21 is configured to request the UE 10 to use a transmit power associated with the serving cell and a transmit power associated with the neighbor cell to determine the transmit power for a transmission of the SRS resource used for positioning purpose. In some embodiments, the processor 21 is configured to request the UE 10 to determine and report a power headroom report for the SRS resource used for positioning purpose and the power headroom report is calculated based on both path loss of serving cell and neighbor cell. In some embodiments, the power headroom report is a type 4 power headroom report.
  • FIG. 2 illustrates a method 200 of an SRS transmission of a UE according to an embodiment of the present disclosure.
  • the method 200 includes: a block 210, being configured, by a network, with configuration information for an SRS resource used for positioning purpose, wherein the configuration information comprises power control parameters associated with a serving cell and power control parameters associated with a neighbor cell, and a block 220, determining a transmit power associated with the serving cell and a transmit power associated with the neighbor cell for the SRS resource used for positioning purpose according to the configuration information.
  • the SRS transmission has enough transmit power to reach multiple neighbor cells to support reliable positioning measurement. Thus, positioning accuracy and reliability based on uplink measurement is improved.
  • the method further comprises each of the power control parameters associated with the serving cell and the power control parameters associated with the neighbor cell comprises a target receiver power level, a path loss compensation factor, and a path loss reference signal. In some embodiments, the method further comprises measuring path loss of the serving cell and path loss of the neighbor cell to determine the transmit power associated with the serving cell and the transmit power associated with the neighbor cell for the SRS resource used for positioning purpose according to the configuration information. In some embodiments, the method further comprises determining the transmit power associated with the serving cell and the transmit power associated with the neighbor cell for the SRS resource used for positioning purpose according to a largest path loss scaled by a corresponding path loss compensation factor. In some embodiments, the method further comprises calculating the transmit power associated with the serving cell and the transmit power associated with the neighbor cell according to the configuration information after measuring path loss of the serving cell and path loss of the neighbor cell.
  • the method further comprises using a transmit power associated with the serving cell and a transmit power associated with the neighbor cell to determine the transmit power for a transmission of the SRS resource used for positioning purpose.
  • the method further comprises being requested, by the network, to determine and report a power headroom report for the SRS resource used for positioning purpose and the power headroom report is calculated based on both path loss of the serving cell and path loss of the neighbor cell.
  • the power headroom report is a type 4 power headroom report.
  • FIG. 3 illustrates a method 300 of an SRS transmission of a network according to an embodiment of the present disclosure.
  • the method 300 includes: a block 310, configuring, to a user equipment (UE) , configuration information for an SRS resource used for positioning purpose, wherein the configuration information comprises power control parameters associated with a serving cell and power control parameters associated with a neighbor cell, and a block 320, requesting the UE to determine a transmit power associated with the serving cell and a transmit power associated with the neighbor cell for the SRS resource used for positioning purpose according to the configuration information.
  • the SRS transmission has enough transmit power to reach multiple neighbor cells to support reliable positioning measurement. Thus, positioning accuracy and reliability based on uplink measurement is improved.
  • each of the power control parameters associated with the serving cell and the power control parameters associated with the neighbor cell comprises a target receiver power level, a path loss compensation factor, and a path loss reference signal.
  • the method further comprises requesting the UE to measure path loss of the serving cell and path loss of the neighbor cell to determine the transmit power associated with the serving cell and the transmit power associated with the neighbor cell for the SRS resource used for positioning purpose according to the configuration information.
  • the method further comprises requesting the UE to determine the transmit power associated with the serving cell and the transmit power associated with the neighbor cell for the SRS resource used for positioning purpose according to a largest path loss scaled by a corresponding path loss compensation factor.
  • the method further comprises requesting the UE to calculate the transmit power associated with the serving cell and the transmit power associated with the neighbor cell according to the configuration information after requesting the UE to measure path loss of the serving cell and path loss of the neighbor cell.
  • the method further comprises requesting the UE to use a transmit power associated with the serving cell and a transmit power associated with the neighbor cell to determine the transmit power for a transmission of the SRS resource used for positioning purpose. In some embodiments, the method further comprises requesting the UE to determine and report a power headroom report for the SRS resource used for positioning purpose and the power headroom report is calculated based on both path loss of serving cell and path loss of neighbor cell. In some embodiments, the power headroom report is a type 4 power headroom report.
  • a UE can be configured with an SRS resource set for positioning and in the SRS resource set, the UE is configured with one or more SRS resources.
  • the UE can be configured with one or more of the following uplink power parameters: Uplink power control parameters associated with the serving cell: target receive power level P 0, s and path loss compensation factor ⁇ s .
  • One downlink reference signal (RS) , RS s used by the UE to measure the path loss between the UE and the serving cell.
  • uplink power control parameters associated with the first neighbor cell target receive power level P 0, n1 and path loss compensation factor ⁇ n1 .
  • One downlink RS, RS n1 used by the UE to measure the path loss between the first neighbor cell and the UE.
  • uplink power control parameters associated with the first neighbor cell target receive power level P 0, n2 and path loss compensation factor ⁇ n2 .
  • One downlink RS RS n2 used by the UE to measure the path loss between the first neighbor cell and the UE.
  • the UE can measure RS s to obtain the path loss between the serving cell and the UE: PL s .
  • the UE can measure the RS n1 to obtain the path loss between the first neighbor cell and the UE: PL n1 .
  • the UE can measure the RS n2 to obtain the path loss between the second neighbor cell and the UE: PL n2 .
  • FIG. 4 illustrates a procedure of uplink power control on SRS transmission for positioning according the methods in this disclosure.
  • the location server at the network side can first send configuration information SRS resources for positioning to the UE.
  • Each SRS resource is configured with uplink power control parameters associated the serving cell and uplink power control parameters associated with one or more neighbor cells.
  • the UE can identify the transmission configuration for SRS transmission for positioning.
  • the UE can also identify the transmit power of SRS transmission for positioning.
  • the serving cell transmits a downlink RS that is configured as path loss reference signal to the UE.
  • the UE receives the downlink RS from the serving cell and measures the RSRP of the downlink RS. Then the UE calculates the path loss of the serving cell based on the measured RSRP.
  • the neighbor cell sends transmits a downlink RS that is configured as path loss reference signal to the UE.
  • the UE receives the downlink RS from the neighbor cell and measures the RSRP (reference signal received power) of the downlink RS. Then the UE calculates the path loss of the neighbor cell. Then the UE can determine the transmit power for an SRS transmission for positioning based the path loss of both serving cell and neighbor cell and also the uplink power control parameters associated with both the serving cell and neighbor cell.
  • the UE transmits SRS resource with determined transmit power to the serving cell and neighbor cell.
  • the serving cell receives the SRS transmission from the UE and measures the results for positioning measurement, for example, time of arrival (TOA) .
  • the neighbor cell receives the SRS transmission from the UE and measures the results for positioning measurement, for example TOA.
  • the serving cell reports the TOA measurement results to the location server.
  • the neighbor cell reports the TOA measurement results to the location server. Then the location server can calculate the location of the UE based on the reported TOA measurement results.
  • the UE receives configuration information of a first SRS resource set that is configured for positioning usage.
  • the UE is configured with K ⁇ 1 SRS resources.
  • the configuration information of the first SRS resource set can be transmitted by a network server, for example a NR location server.
  • the configuration information of the first SRS resource set can be transmitted by the serving cell.
  • the UE can be configured one or more of the following parameters for uplink power control on the SRS transmission in SRS resources contained in the first set: Pcmax: the maximum output power the UE can apply on SRS transmission for positioning, a set of parameters associated with the serving cell: alphaServingCell: path loss compensation factor for the path loss of the serving cell.
  • P0ServiceCell the target receive power of SRS transmission for positioning at the side of TRP of the serving cell.
  • pathlossReferenceRSServingCell a downlink CSI-RS or SS/PBCH of the serving cell to provide measurement for path loss calculation.
  • ss-PBCH-BlockPowerServingCell the downlink transmit power of SS/PBCH in the serving cell.
  • powerControlOffSetSS the power offset of the CSI-RS resource configured as pathlossReferenceRSServingCell with respect to the SS/PBCH.
  • a set of parameters associated with a first neighbor cell alphaNeighborCell: path loss compensation factor for the path loss of a neighbor cell.
  • P0NeighborCell the target receive power of SRS transmission for positioning at the side of TRP of the neighbor cell.
  • pathlossReferenceRSNeighborCell a downlink CSI-RS or SS/PBCH of the neighbor cell to provide measurement for path loss calculation. If it is a SS/PBCH, the following parameter are provided: ssb-PositionsInburst, ssb-periodicity, ssbSubcarrierSpacing, and index of a SS/PBCH block.
  • ss-PBCH-BlockPowerNeighborCell the downlink transmit power of SS/PBCH in the neighbor cell.
  • powerControlOffSetSS the power offset of the CSI-RS resource configured as pathlossReferenceRSServingCell with respect to the SS/PBCH.
  • alphaNeighborCell path loss compensation factor for the path loss of a neighbor cell.
  • P0NeighborCell the target receive power of SRS transmission for positioning at the side of TRP of the neighbor cell.
  • pathlossReferenceRSNeighborCell a downlink CSI-RS or SS/PBCH of the neighbor cell to provide measurement for path loss calculation. If it is a SS/PBCH, the following parameter are provided: ssb-PositionsInburst, ssb-periodicity, ssbSubcarrierSpacing, and index of a SS/PBCH block.
  • ss-PBCH-BlockPowerNeighborCell the downlink transmit power of SS/PBCH in the neighbor cell.
  • powerControlOffSetSS the power offset of the CSI-RS resource configured as pathlossReferenceRSServingCell with respect to the SS/PBCH.
  • the UE is configured with a set of uplink power control parameters for each neighbor cell. In another example, the UE is configured with some parameters that are common for all neighbor cell and some parameters that are dedicated for each neighbor.
  • An example of configuration for neighbor cells is: Set of parameters for neighbor cells: Common parameters for all neighbor cells: alphaNeighborCell: path loss compensation factor for the path loss of a neighbor cell. P0NeighborCell: the target receive power of SRS transmission for positioning at the side of TRP of the neighbor cell.
  • pathlossReferenceRSNeighborCell a downlink CSI-RS or SS/PBCH of the neighbor cell to provide measurement for path loss calculation.
  • the UE determines the SRS transmission power P SRS, positiong for a first SRS resource for positioning as follows: where: P CMAX is the UE configured maximum output power. P 0 is the target receive power provided by higher layer parameter. M SRS is the SRS bandwidth expressed in number of resource blocks for the SRS transmission. in the first SRS resource. ⁇ is the SCS (subcarrier spacing) configuration. ⁇ s is the path loss compensation factor associated with the serving cell, which is provided by higher layer parameter. PL s is a downlink pathloss estimate in dB calculated by UE using the RS resource index that is configured as the path loss reference signal associated with the serving cell.
  • ⁇ n1 is the path loss compensation factor associated with a first neighbor cell, which is provided by higher layer parameter.
  • PL n1 is a downlink pathloss estimate in dB calculated by UE using the RS resource index that is configured as the path loss reference signal associated with the first neighbor cell.
  • ⁇ n2 is the path loss compensation factor associated with a second neighbor cell, which is provided by higher layer parameter.
  • PL n2 is a downlink pathloss estimate in dB calculated by UE using the RS resource index that is configured as the path loss reference signal associated with the first and second cells.
  • h is the close-power control parameter for SRS transmission for positioning, which can be updated by the close-loop power command sent by the serving cell.
  • the transmit power is calculated according to the maximal of scaled path loss. That can ensure the SRS transmission has enough power to reach the neighbor cell with ‘worst’ link.
  • the UE determines the SRS transmission power P SRS, positiong for a first SRS resource for positioning as follows: where P CMAX is the UE configured maximum output power.
  • P 0, s is the target receive power provided by higher layer parameter associated with the serving cell.
  • P 0, n1 is the target receive power provided by higher layer parameter associated with the first neighbor cell.
  • P 0, n2 is the target receive power provided by higher layer parameter associated with the second neighbor cell.
  • M SRS is the SRS bandwidth expressed in number of resource blocks for the SRS transmission. in the first SRS resource.
  • ⁇ is the SCS (subcarrier spacing) configuration.
  • ⁇ s is the path loss compensation factor associated with the serving cell, which is provided by higher layer parameter.
  • PL s is a downlink pathloss estimate in dB calculated by UE using the RS resource index that is configured as the path loss reference signal associated with the serving cell.
  • ⁇ n1 is the path loss compensation factor associated with a first neighbor cell, which is provided by higher layer parameter.
  • PL n1 is a downlink pathloss estimate in dB calculated by UE using the RS resource index that is configured as the path loss reference signal associated with the first neighbor cell.
  • ⁇ n2 is the path loss compensation factor associated with a second neighbor cell, which is provided by higher layer parameter.
  • PL n2 is a downlink pathloss estimate in dB calculated by UE using the RS resource index that is configured as the path loss reference signal associated with the first second cell.
  • h is the close-power control parameter for SRS transmission for positioning, which can be updated by the close-loop power command sent by the serving cell.
  • the UE determines the SRS transmission power P SRS, positiong for a first SRS resource for positioning as follows: where: P CMAX is the UE configured maximum output power.
  • P 0, s is the target receive power provided by higher layer parameter associated with the serving cell.
  • P 0, n1 is the target receive power provided by higher layer parameter associated with the first neighbor cell.
  • P 0, n2 is the target receive power provided by higher layer parameter associated with the second neighbor cell.
  • M SRS is the SRS bandwidth expressed in number of resource blocks for the SRS transmission. in the first SRS resource.
  • ⁇ is the SCS (subcarrier spacing) configuration.
  • ⁇ s is the path loss compensation factor associated with the serving cell, which is provided by a higher layer parameter.
  • PL s is a downlink pathloss estimate in dB calculated by UE using the RS resource index that is configured as the path loss reference signal associated with the serving cell.
  • ⁇ n1 is the path loss compensation factor associated with a first neighbor cell, which is provided by higher layer parameter.
  • PL n1 is a downlink pathloss estimate in dB calculated by UE using the RS resource index that is configured as the path loss reference signal associated with the first neighbor cell.
  • ⁇ n2 is the path loss compensation factor associated with a second neighbor cell, which is provided by higher layer parameter.
  • PL n2 is a downlink pathloss estimate in dB calculated by UE using the RS resource index that is configured as the path loss reference signal associated with the first second cell.
  • h s is the close- power control parameter for SRS transmission for positioning, which can be updated by the close-loop power command sent by the serving cell.
  • h n1 and h n2 are the close-power control parameter for SRS transmission for positioning, which can be updated based on the close-loop power command of the first neighbor cell and second neighbor cell, respectively. Since there is no data connection between the UE and the neighbor cell, the close-loop power control command of a neighbor cell can be forwarded by the serving cell.
  • the UE can be provided with a path loss value PL ref, n1 associated with a first neighbor cell.
  • the UE can be requested to include the configured path loss value PL ref, n1 in calculation of transmit power.
  • the UE does not need to measure a downlink RS to calculate the path loss between the first neighbor cell and the UE.
  • FIG. 5 illustrates a procedure of a power headroom report 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 an SRS transmission in an SRS resource configured for positioning usage.
  • the reason for that method is that uplink power control on SRS transmission for positioning takes into account the path loss of both serving cell and neighbor cell while the uplink power control on SRS transmission for other usage (for example, beam management, codebook-based, non-codebook based or antenna switch) only considers the path loss of serving cell. Therefore, the power headroom calculated based on SRS transmission for positioning would be different from that calculated based on SRS transmission for other usage.
  • a UE can be requested to determine a power headroom report for the SRS transmission for positioning and report that power headroom report to the serving cell.
  • the power headroom report dedicated for SRS transmission for positioning can be called Type 4 power headroom report.
  • the UE determines a Type 4 power headroom report based on one SRS transmission for positioning usage as:
  • Alt1 If the UE uses a reference SRS transmission for positioning usage for Type 4 power headroom report calculation, there are other alternatives: Alt1:
  • the UE can use the uplink power control parameters configured to that SRS resource set for determining Type 4 power headroom report when a reference SRS transmission is used.
  • the UE can use the uplink power control parameters configured to the SRS resource set with lowest set ID for determining Type 4 power headroom report when a reference SRS transmission is used.
  • the methods of uplink power control for SRS transmission for positioning purpose are proposed.
  • the network configures power control parameters for the serving cell and power control parameters for each neighbor cell, separately, where the power control parameters include target receiver power level P_0, path loss compensation factor ⁇ and path loss reference signal.
  • the UE measures the path loss of each cell and then include the power control parameters of both serving cell and neighbor cells to determine the transmit power for SRS transmission for positioning.
  • One method to determine the transmit power is the UE uses the largest path loss scaled by the corresponding path loss compensation factor.
  • One method to determine the transmit power is the UE first calculate the transmit power for cell based on the configured power control parameter for each cell and the measured path loss and then the UE use the maximal of those transmit powers for the transmission.
  • the UE can report power headroom for the SRS for positioning too.
  • the UE takes into account the path loss of both serving cell and neighbor cells, for which power control parameters are configured.
  • the embodiment of the present disclosure methods and apparatuses of uplink power control for a sounding reference signal (SRS) transmission for positioning purpose capable of improving positioning accuracy and reliability based on uplink measurement are provided.
  • the embodiment of the present disclosure is a combination of techniques/processes that can be adopted in 3GPP specification to create an end product.
  • the transmit power of one SRS transmission for positioning takes into account the path loss of serving cell and neighbor cells.
  • the benefit is the SRS transmission has enough transmit (Tx) power to reach multiple neighbor cells to support reliable positioning measurement.
  • Tx transmit
  • FIG. 6 is a block diagram of an example system 700 for wireless communication according to an embodiment of the present disclosure. Embodiments described herein may be implemented into the system using any suitably configured hardware and/or software.
  • FIG. 6 illustrates the system 700 including a radio frequency (RF) circuitry 710, a baseband circuitry 720, an application circuitry 730, a memory/storage 740, a display 750, a camera 760, a sensor 770, and an input/output (I/O) interface 780, coupled with each other at least as illustrated.
  • RF radio frequency
  • the application circuitry 730 may include a circuitry, such as, but not limited to, one or more single-core or multi-core processors.
  • the processors may include any combinations of general-purpose processors and dedicated processors, such as graphics processors and application processors.
  • the processors 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 running on the system.
  • the baseband circuitry 720 may include a circuitry, such as, but not limited to, one or more single-core or multi-core processors.
  • the processors may include a baseband processor.
  • the baseband circuitry may handle various radio control functions that enable communication with one or more radio networks via the RF circuitry.
  • the radio control functions may include, but are not limited to, signal modulation, encoding, decoding, radio frequency shifting, etc.
  • the baseband circuitry may provide for communication compatible with one or more radio technologies.
  • the baseband circuitry may support communication with an evolved universal terrestrial radio access network (EUTRAN) and/or other wireless metropolitan area networks (WMAN) , a wireless local area network (WLAN) , a wireless personal area network (WPAN) .
  • EUTRAN evolved universal terrestrial radio access network
  • WMAN wireless metropolitan area networks
  • WLAN wireless local area network
  • WPAN wireless personal area network
  • the baseband circuitry 720 may include circuitry to operate with signals that are not strictly considered as being in a baseband frequency.
  • baseband circuitry may include circuitry to operate with signals having an intermediate frequency, which is between a baseband frequency and a radio frequency.
  • the RF circuitry 710 may enable communication with wireless networks using modulated electromagnetic radiation through a non-solid medium.
  • the RF circuitry may include switches, filters, amplifiers, etc. to facilitate the communication with the wireless network.
  • the RF circuitry 710 may include circuitry to operate with signals that are not strictly considered as being in a radio frequency.
  • RF circuitry may include circuitry to operate with signals having an intermediate frequency, which is between a baseband frequency and a radio frequency.
  • the transmitter circuitry, control circuitry, or receiver circuitry discussed above with respect to the user equipment, eNB, or gNB may be embodied in whole or in part in one or more of the RF circuitry, the baseband circuitry, and/or the application circuitry.
  • “circuitry” may refer to, be part of, or include an Application Specific Integrated Circuit (ASIC) , an electronic circuit, a processor (shared, dedicated, or group) , and/or a 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.
  • ASIC Application Specific Integrated Circuit
  • the electronic device circuitry may be implemented in, or functions associated with the circuitry may be implemented by, one or more software or firmware modules.
  • some or all of the constituent components of the baseband circuitry, the application circuitry, and/or the memory/storage may be implemented together on a system on a chip (SOC) .
  • the memory/storage 740 may be used to load and store data and/or instructions, for example, for system.
  • the memory/storage for one 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.
  • the I/O interface 780 may include one or more user interfaces designed to enable user interaction with the system and/or peripheral component interfaces designed to enable peripheral component interaction with the system.
  • User interfaces may include, but are not limited to a physical keyboard or keypad, a touchpad, a speaker, a microphone, etc.
  • Peripheral component interfaces may include, but are not limited to, a non-volatile memory port, a universal serial bus (USB) port, an audio jack, and a power supply interface.
  • USB universal serial bus
  • the sensor 770 may include one or more sensing devices to determine environmental conditions and/or location information related to the system.
  • the sensors may include, but are not limited to, a gyro sensor, an accelerometer, a proximity sensor, an ambient light sensor, and a positioning unit.
  • the positioning unit may also be part of, or interact with, the baseband circuitry and/or RF circuitry to communicate with components of a positioning network, e.g., a global positioning system (GPS) satellite.
  • the display 750 may include a display, such as a liquid crystal display and a touch screen display.
  • the system 700 may be a mobile computing device such as, but not limited to, a laptop computing device, a tablet computing device, a netbook, an ultrabook, a smartphone, etc.
  • system may have more or less components, and/or different architectures.
  • methods described herein may be implemented as a computer program.
  • the computer program may be stored on a storage medium, such as a non-transitory storage medium.
  • the units as separating components for explanation are or are not physically separated.
  • the units for display are or are not physical units, that is, located in one place or distributed on a plurality of network units. Some or all of the units are used according to the purposes of the embodiments.
  • each of the functional units in each of the embodiments can be integrated in one processing unit, physically independent, or integrated in one processing unit with two or more than two units.
  • the software function unit is realized and used and sold as a product, it can be stored in a readable storage medium in a computer.
  • the technical plan proposed by the present disclosure can be essentially or partially realized as the form of a software product.
  • one part of the technical plan beneficial to the conventional technology can be realized as the form of a software product.
  • the software product in the computer is stored in a storage medium, including a plurality of commands for a computational device (such as a personal computer, a server, or a network device) to run all or some of the steps disclosed by the embodiments of the present disclosure.
  • the storage medium includes a USB disk, a mobile hard disk, a read-only memory (ROM) , a random access memory (RAM) , a floppy disk, or other kinds of media capable of storing program codes.

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Abstract

La présente invention concerne des procédés et des appareils de régulation de la puissance de liaison montante pour une transmission d'un signal de référence de sondage (SRS) à des fins de positionnement. L'invention concerne également un procédé de régulation de la puissance de liaison montante pour une transmission d'un signal de référence de sondage (SRS) d'un équipement d'utilisateur (UE) comprenant la configuration, par un réseau, à l'aide d'informations de configuration pour une ressource de SRS utilisée à des fins de positionnement, les informations de configuration comprenant des paramètres de régulation de la puissance associés à une cellule de desserte et des paramètres de régulation de la puissance associés à une cellule voisine et la détermination d'une puissance de transmission associée à la cellule de desserte et d'une puissance de transmission associée à la cellule voisine pour la ressource de SRS utilisée pour le positionnement selon les informations de configuration. La transmission de SRS a suffisamment de puissance de transmission pour atteindre une pluralité de cellules voisines afin de prendre en charge une mesure de positionnement fiable. Ainsi, la précision et la fiabilité du positionnement, en fonction d'une mesure de liaison montante, sont améliorées.
PCT/CN2019/124906 2019-07-19 2019-12-12 Procédés et appareils de régulation de la puissance de liaison montante pour la transmission d'un signal de référence de sondage WO2021012586A1 (fr)

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