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WO2023283755A1 - Systèmes et procédés de positionnement en liaison descendante - Google Patents

Systèmes et procédés de positionnement en liaison descendante Download PDF

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Publication number
WO2023283755A1
WO2023283755A1 PCT/CN2021/105702 CN2021105702W WO2023283755A1 WO 2023283755 A1 WO2023283755 A1 WO 2023283755A1 CN 2021105702 W CN2021105702 W CN 2021105702W WO 2023283755 A1 WO2023283755 A1 WO 2023283755A1
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Prior art keywords
prs
same
measurements
wireless communication
resources
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English (en)
Inventor
Guozeng ZHENG
Chuangxin JIANG
Bo Gao
Zhaohua Lu
Yu Pan
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • H04W64/006—Locating users or terminals or network equipment for network management purposes, e.g. mobility management with additional information processing, e.g. for direction or speed determination

Definitions

  • the disclosure relates generally to wireless communications and, more particularly, to systems and methods for measurement of resources in downlink positioning.
  • the standardization organization Third Generation Partnership Project (3GPP) is currently in the process of specifying a new Radio Interface called 5G New Radio (5G NR) as well as a Next Generation Packet Core Network (NG-CN or NGC) .
  • the 5G NR will have three main components: a 5G Access Network (5G-AN) , a 5G Core Network (5GC) , and a User Equipment (UE) .
  • 5G-AN 5G Access Network
  • 5GC 5G Core Network
  • UE User Equipment
  • the elements of the 5GC also called Network Functions, have been simplified with some of them being software based so that they could be adapted according to need.
  • example embodiments disclosed herein are directed to solving the issues relating to one or more of the problems presented in the prior art, as well as providing additional features that will become readily apparent by reference to the following detailed description when taken in conjunction with the accompany drawings.
  • example systems, methods, devices and computer program products are disclosed herein. It is understood, however, that these embodiments are presented by way of example and are not limiting, and it will be apparent to those of ordinary skill in the art who read the present disclosure that various modifications to the disclosed embodiments can be made while remaining within the scope of this disclosure.
  • a User Equipment performs a method including receiving, from a Location Management Function (LMF) , a downlink positioning reference signal (DL PRS) configuration; and sending, to the LMF, a message including measurements of a plurality of DL PRS resources according to the DL PRS configuration.
  • LMF Location Management Function
  • a LMF performs a method including sending, to a UE, a DL PRS configuration; and receiving, from the UE, a message including measurements of a plurality of DL PRS resources according to the DL PRS configuration.
  • a wireless communications apparatus comprising a processor and a memory, wherein the processor is configured to read code from the memory and implement a method including receiving, from a LMF, a DL PRS configuration; and sending, to the LMF, a message including measurements of a plurality of DL PRS resources according to the DL PRS configuration.
  • a computer program product comprising a computer-readable program medium code stored thereupon, the code, when executed by a processor, causing the processor to implement a method including receiving, from a LMF, a DL PRS configuration; and sending, to the LMF, a message including measurements of a plurality of DL PRS resources according to the DL PRS configuration.
  • FIG. 1 is an example cellular communication network in which techniques disclosed herein may be implemented, according to various embodiments.
  • FIG. 2 illustrates a block diagram of an example base station and a user equipment device, according to various embodiments.
  • FIG. 3 is an example schematic of transmission using different transmission beams, according to various arrangements.
  • FIG. 4A is a flowchart diagram illustrating an example wireless communication method for measurement of resources in downlink positioning, according to various embodiments.
  • FIG. 4B is a flowchart diagram illustrating another example wireless communication method for measurement of resources in downlink positioning, according to various embodiments.
  • FIG. 1 illustrates an example wireless communication network, and/or system, 100 in which techniques disclosed herein may be implemented, in accordance with an embodiment of the present disclosure.
  • the wireless communication network 100 may be any wireless network, such as a cellular network or a narrowband Internet of things (NB- IoT) network, and is herein referred to as “network 100.
  • NB- IoT narrowband Internet of things
  • Such an example network 100 includes a base station 102 (hereinafter “BS 102” ; also referred to as wireless communication node) and a user equipment device 104 (hereinafter “UE 104” ; also referred to as wireless communication device) that can communicate with each other via a communication link 110 (e.g., a wireless communication channel) , and a cluster of cells 126, 130, 132, 134, 136, 138 and 140 overlaying a geographical area 101.
  • the BS 102 and UE 104 are contained within a respective geographic boundary of cell 126.
  • Each of the other cells 130, 132, 134, 136, 138 and 140 may include at least one base station operating at its allocated bandwidth to provide adequate radio coverage to its intended users.
  • the BS 102 may operate at an allocated channel transmission bandwidth to provide adequate coverage to the UE 104.
  • the BS 102 and the UE 104 may communicate via a downlink radio frame 118, and an uplink radio frame 124 respectively.
  • Each radio frame 118/124 may be further divided into sub-frames 120/127 which may include data symbols 122/128.
  • the BS 102 and UE 104 are described herein as non-limiting examples of “communication nodes, ” generally, which can practice the methods disclosed herein. Such communication nodes may be capable of wireless and/or wired communications, in accordance with various embodiments of the present solution.
  • FIG. 2 illustrates a block diagram of an example wireless communication system 200 for transmitting and receiving wireless communication signals (e.g., OFDM/OFDMA signals) in accordance with some embodiments of the present solution.
  • the system 200 may include components and elements configured to support known or conventional operating features that need not be described in detail herein.
  • system 200 can be used to communicate (e.g., transmit and receive) data symbols in a wireless communication environment such as the wireless communication environment 100 of Figure 1, as described above.
  • the System 200 generally includes a base station 202 (hereinafter “BS 202” ) and a user equipment device 204 (hereinafter “UE 204” ) .
  • the BS 202 includes a BS (base station) transceiver module 210, a BS antenna 212, a BS processor module 214, a BS memory module 216, and a network communication module 218, each module being coupled and interconnected with one another as necessary via a data communication bus 220.
  • the UE 204 includes a UE (user equipment) transceiver module 230, a UE antenna 232, a UE memory module 234, and a UE processor module 236, each module being coupled and interconnected with one another as necessary via a data communication bus 240.
  • the BS 202 communicates with the UE 204 via a communication channel 250, which can be any wireless channel or other medium suitable for transmission of data as described herein.
  • system 200 may further include any number of modules other than the modules shown in Figure 2.
  • modules other than the modules shown in Figure 2.
  • Those skilled in the art will understand that the various illustrative blocks, modules, circuits, and processing logic described in connection with the embodiments disclosed herein may be implemented in hardware, computer-readable software, firmware, or any practical combination thereof. To clearly illustrate this interchangeability and compatibility of hardware, firmware, and software, various illustrative components, blocks, modules, circuits, and steps are described generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware, or software can depend upon the particular application and design constraints imposed on the overall system. Those familiar with the concepts described herein may implement such functionality in a suitable manner for each particular application, but such implementation decisions should not be interpreted as limiting the scope of the present disclosure
  • the UE transceiver 230 may be referred to herein as an "uplink" transceiver 230 that includes a radio frequency (RF) transmitter and a RF receiver each comprising circuitry that is coupled to the antenna 232.
  • a duplex switch (not shown) may alternatively couple the uplink transmitter or receiver to the uplink antenna in time duplex fashion.
  • the BS transceiver 210 may be referred to herein as a "downlink" transceiver 210 that includes a RF transmitter and a RF receiver each comprising circuity that is coupled to the antenna 212.
  • a downlink duplex switch may alternatively couple the downlink transmitter or receiver to the downlink antenna 212 in time duplex fashion.
  • the operations of the two transceiver modules 210 and 230 may be coordinated in time such that the uplink receiver circuitry is coupled to the uplink antenna 232 for reception of transmissions over the wireless transmission link 250 at the same time that the downlink transmitter is coupled to the downlink antenna 212. Conversely, the operations of the two transceivers 210 and 230 may be coordinated in time such that the downlink receiver is coupled to the downlink antenna 212 for reception of transmissions over the wireless transmission link 250 at the same time that the uplink transmitter is coupled to the uplink antenna 232. In some embodiments, there is close time synchronization with a minimal guard time between changes in duplex direction.
  • the UE transceiver 230 and the base station transceiver 210 are configured to communicate via the wireless data communication link 250, and cooperate with a suitably configured RF antenna arrangement 212/232 that can support a particular wireless communication protocol and modulation scheme.
  • the UE transceiver 210 and the base station transceiver 210 are configured to support industry standards such as the Long Term Evolution (LTE) and emerging 5G standards, and the like. It is understood, however, that the present disclosure is not necessarily limited in application to a particular standard and associated protocols. Rather, the UE transceiver 230 and the base station transceiver 210 may be configured to support alternate, or additional, wireless data communication protocols, including future standards or variations thereof.
  • LTE Long Term Evolution
  • 5G 5G
  • the BS 202 may be an evolved node B (eNB) , a serving eNB, a target eNB, a femto station, or a pico station, for example.
  • eNB evolved node B
  • the UE 204 may be embodied in various types of user devices such as a mobile phone, a smart phone, a personal digital assistant (PDA) , tablet, laptop computer, wearable computing device, etc.
  • PDA personal digital assistant
  • the processor modules 214 and 236 may be implemented, or realized, with a general purpose processor, a content addressable memory, a digital signal processor, an application specific integrated circuit, a field programmable gate array, any suitable programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described herein.
  • a processor may be realized as a microprocessor, a controller, a microcontroller, a state machine, or the like.
  • a processor may also be implemented as a combination of computing devices, e.g., a combination of a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other such configuration.
  • the steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in firmware, in a software module executed by processor modules 214 and 236, respectively, or in any practical combination thereof.
  • the memory modules 216 and 234 may be realized as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
  • memory modules 216 and 234 may be coupled to the processor modules 210 and 230, respectively, such that the processors modules 210 and 230 can read information from, and write information to, memory modules 216 and 234, respectively.
  • the memory modules 216 and 234 may also be integrated into their respective processor modules 210 and 230.
  • the memory modules 216 and 234 may each include a cache memory for storing temporary variables or other intermediate information during execution of instructions to be executed by processor modules 210 and 230, respectively.
  • Memory modules 216 and 234 may also each include non-volatile memory for storing instructions to be executed by the processor modules 210 and 230, respectively.
  • the network communication module 218 generally represents the hardware, software, firmware, processing logic, and/or other components of the base station 202 that enable bi-directional communication between base station transceiver 210 and other network components and communication nodes configured to communication with the base station 202.
  • network communication module 218 may be configured to support internet or WiMAX traffic.
  • network communication module 218 provides an 802.3 Ethernet interface such that base station transceiver 210 can communicate with a conventional Ethernet based computer network.
  • the network communication module 218 may include a physical interface for connection to the computer network (e.g., Mobile Switching Center (MSC) ) .
  • MSC Mobile Switching Center
  • the Open Systems Interconnection (OSI) Model (referred to herein as, “open system interconnection model” ) is a conceptual and logical layout that defines network communication used by systems (e.g., wireless communication device, wireless communication node) open to interconnection and communication with other systems.
  • the model is broken into seven subcomponents, or layers, each of which represents a conceptual collection of services provided to the layers above and below it.
  • the OSI Model also defines a logical network and effectively describes computer packet transfer by using different layer protocols.
  • the OSI Model may also be referred to as the seven-layer OSI Model or the seven-layer model.
  • a first layer may be a physical layer.
  • a second layer may be a Medium Access Control (MAC) layer.
  • MAC Medium Access Control
  • a third layer may be a Radio Link Control (RLC) layer.
  • a fourth layer may be a Packet Data Convergence Protocol (PDCP) layer.
  • PDCP Packet Data Convergence Protocol
  • a fifth layer may be a Radio Resource Control (RRC) layer.
  • a sixth layer may be a Non Access Stratum (NAS) layer or an Internet Protocol (IP) layer, and the seventh layer being the other layer.
  • NAS Non Access Stratum
  • IP Internet Protocol
  • DL-AOD positioning In current 5G New Radio (NR) positioning systems, the protocol supports Downlink Angle of Departure (DL-AOD) positioning method.
  • the general procedures for DL-AOD positioning includes the following steps: first, a serving NR Node B (gNB) and neighbor gNBs provide configured Downlink (DL) Positioning Reference Signal (PRS) to a Location Management Function (LMF) via NR Positioning Protocol A (NRPPa) in a Transmission and Reception Point (TRP) INFORMATION RESPONSE message.
  • LMF Location Management Function
  • NRPPa NR Positioning Protocol A
  • TRP Transmission and Reception Point
  • the TRP or gNB-Distributed Unit (DU)
  • DU may also provide configured DL PRS to corresponding gNB (or gNB-Central Unit (CU) ) via F1 Application Protocol (F1AP) in TRP INFORMATION RESPONSE message.
  • F1AP Application Protocol
  • the LMF provides DL PRS configuration forwarded by gNBs to UE via Long Term Evolution (LTE) Positioning Protocol (LPP) in a ProvideAssistanceData message.
  • the DL PRS configuration includes at least one of: a) positioning frequency layer (s) , where each positioning frequency layer is a collection of DL PRS resource sets across one or more TRPs that have the same Sub-Carrier Spacing (SCS) , Cyclic Prefix (CP) type, center frequency, reference frequency, configured Bandwidth (BW) , and/or comb size; b) one or multiple TRPs that are associated with each positioning frequency layer, which is identified by TRP ID information; c) one or more DL PRS resource sets that are associated with each TRP, which is identified by DL PRS resource set ID.
  • SCS Sub-Carrier Spacing
  • CP Cyclic Prefix
  • BW Bandwidth
  • Each DL PRS resource set may be configured with a DL PRS transmission power, which indicates that the average Energy Per Resource Element (EPRE) of the resource elements that carry the DL PRS in Decibel-Milliwatts (dBm) that is used for DL PRS transmission.
  • EPRE Energy Per Resource Element
  • the UE assumes a constant EPRE for all Resource Elements (REs) of a given DL PRS resource, and all DL PRS resources within the same DL PRS resource set have the same transmission power; or d) one or multiple DL PRS resources are configured within a DL PRS resource set, which is identified by DL PRS resource ID.
  • each DL PRS resource may be transmitted by TRP (or gNB) with different DL transmission beams.
  • FIG. 3 is an example schematic 300 of transmission using different transmission beams, according to various arrangements.
  • BS 310 transmits a first DL PRS resource on a first DL transmission beam 311, a second DL PRS resource on a second DL transmission beam 312, and a third DL PRS resource on a third DL transmission beam 313.
  • a UE 320 then receives a first receiving beam 321, a second receiving beam 322, a third receiving beam 323, and a fourth receiving beam 324.
  • the angle of the boresight direction in which the DL-PRS resource set is transmitted may also need to be provided to the UE.
  • each target DL PRS resource may be associated with a RS as a source RS for Quasi Co-Location (QCL) .
  • the source RS can be a Synchronization Signal (SS) /Physical Broadcast Channel (PBCH) block (SSB) , which is indicated by at least one of: a) a physical cell Identification (ID) of the cell with the SSB that is configured as the source reference signal for the target DL PRS resource; b) an SSB index indicates the index for the SSB configured as the source RS for the target DL PRS resource; or c) a QCL type, which can be one of ⁇ QCL-TypeC ⁇ , ⁇ QCL-TypeD ⁇ or ⁇ QCL-TypeC+QCL-TypeD ⁇ .
  • the source RS for QCL can also be a DL PRS resource transmitted from the same TRP (or gNB) that is indicated by a DL PRS resource set ID and a DL PRS resource ID
  • the LMF requires the UE to provide a location management report based on the DL PRS configuration in ProvideAssistanceData message to derive requested contents.
  • the request message is via LPP in RequestLocationInformation message, which may include a signaling that indicates the maximum number of DL-PRS Reference Signal Received Power (RSRP) measurements that is allowed to be reported from the same TRP.
  • RSRP Reference Signal Received Power
  • the UE conducts positioning measurements as requested by RequestLocationInformation message based on DL PRS configuration in ProvideAssistanceData message.
  • the location measurement report measured is then forwarded to the LMF via LPP protocol in ProvideLocationInformation message, which includes several measurement elements.
  • Each measurement element includes at least one of: a) DL PRS ID, which is a TRP ID (or gNB ID) that can be used along with a DL PRS resource set ID and a DL PRS resource ID to uniquely identify a DL PRS Resource; b) DL PRS resource set ID; c) DL PRS Resources ID; d) DL PRS-RSRP measurement, which is the RSRP measured/derived by the UE from associated the DL PRS resource set ID and the DL PRS resource ID.
  • DL PRS ID which is a TRP ID (or gNB ID) that can be used along with a DL PRS resource set ID and a DL PRS resource ID to uniquely identify a DL PRS Resource
  • b) DL PRS resource set ID c) DL PRS Resources ID
  • d) DL PRS-RSRP measurement which is the RSRP measured/derived by the UE from associated the DL PRS resource set ID and the DL PRS resource ID.
  • the UE may report multiple DL PRS-RSRP measurements in a measurement element, which each DL PRS-RSRP measurement associated with a corresponding DL PRS resource set ID and DL PRS resource ID to derive the DL PRS-RSRP measurement.
  • the UE should report an absolute DL PRS-RSRP measurement (given in units of dBm) that is an absolute DL PRS-RSRP value based on the reception of the corresponding DL PRS resource.
  • the UE may also report additional DL PRS-RSRP measurements, each of which is acquired from an additional DL PRS-RSRP value relative to the absolute DL PRS-RSRP value.
  • the unit of the additional DL PRS-RSRP measurement is dB and the corresponding value is not larger than zero; or e) DL PRS Receiving (Rx) beam index, which provides an index of the target device Rx beam (or spatial domain filter) used for reception of the indicated DL PRS resource (e.g., as shown in FIG. 3) .
  • This field i.e., DL PRS Rx beam index
  • DL PRS Rx beam index is mandatory if at least two DL-PRS RSRP measurements from the same DL-PRS Resource set have been made with the same Rx beam by the target device. Otherwise, the field is not present.
  • the UE may indicate which DL PRS-RSRP measurements associated with the same DL PRS Rx beam index have been performed using the same spatial domain filter for reception if each DL PRS Rx beam index reported there are at least 2 DL PRS-RSRP measurements associated with the same DL PRS Rx beam index have been performed using the same spatial domain filter for reception if, for each DL PRS Rx beam index reported, there are at least 2 DL PRS-RSRP measurements associated with it within the DL PRS resource set.
  • the LMF can utilize the ProvideLocationInformation message to locate the UE.
  • the term ‘beam state’ is equivalent to QCL state, Transmission Configuration Indicator (TCI) state, spatial relation (also known as spatial relation information) , RS, spatial filter, or pre-coding.
  • TCI Transmission Configuration Indicator
  • RS spatial relation
  • pre-coding spatial filter
  • the term ‘beam’ is used interchangeably with ‘beam state, ’ such that: a) the definition of ‘Transmission (Tx) beam’ is equivalent to QCL state, TCI state, spatial relation state, DL RS, Uplink (UL) RS, Tx spatial filter, or Tx precoding; b the definition of ‘Rx beam’ is equivalent to QCL state, TCI state, spatial relation state, spatial filter, Rx spatial filter, or Rx precoding; and c) the definition of ‘beam ID’ is equivalent to QCL state index, TCI state index, spatial relation state index, RS index, spatial filter index, or precoding index.
  • the spatial filter can be either UE-side or gNB-side, and the spatial filter is also referred to as a spatial-domain filter.
  • spatial relation information includes one or more reference RSs, which is used to represent the same or quasi-co “spatial relation” between targeted “RS or channel” and the one or more reference RSs.
  • the term ‘spatial relation’ refers to the beam, spatial parameter, or spatial domain filter.
  • the QCL state is comprised of one or more reference RSs and their corresponding QCL type parameters that include at least at least one or more of: a) Doppler spread; b) Doppler shift; c) delay spread; d) average delay; e) average gain; or f) Spatial parameter (also called spatial Rx parameter) .
  • the term ‘TCI state’ may also be used interchangeably with QCL state.
  • the term ‘QCL-TypeA’ refers to: ⁇ Doppler shift, Doppler spread, average delay, delay spread ⁇
  • the term 'QCL-TypeB' refers to: ⁇ Doppler shift, Doppler spread ⁇
  • the term 'QCL-TypeC' ⁇ Doppler shift, average delay ⁇
  • the term 'QCL-TypeD' refers to: ⁇ Spatial Rx parameter ⁇ .
  • the UE receives a DL PRS configuration from LMF, and then sends/reports a message to LMF that includes various measurements according to the received DL PRS configuration. In some embodiments, these measurements are DL PRS-RSRP measurements.
  • these measurements are DL PRS-RSRP measurements.
  • the current NR DL-AOD positioning methods have several issues. A first issue is that when the UE reports DL PRS-RSRP measurements from one DL PRS resource set, the UE may indicate which DL PRS-RSRP measurements from the same DL PRS Rx beam index have been performed using the same spatial domain filter for reception.
  • this indication mechanism is restricted to DL PRS-RSRP measurements from the same DL PRS resource set, such that the LMF side would not understand the meaning when two DL PRS-RSRP measurements are associated with the same DL PRS Rx beam index but the two DL PRS-RSRP measurements are derived from different DL PRS resource sets.
  • the UE when the UE reports measurements (e.g., DL PRS-RSRP measurements) from or based on DL PRS resource sets associated with the same positioning frequency layer and the same TRP (e.g., associated with the same TRP ID) , the UE may indicate which measurements associated with the same DL PRS Rx beam index have been performed using the same spatial domain filter for reception. These measurements are derived from DL PRS resources in DL PRS resource sets associated with a same positioning frequency layer and a same TRP. Furthermore, the DL PRS Rx beam index is reported only if there are at least 2 measurements associated with DL PRS Rx beam index within DL PRS resource sets associated with the same positioning frequency layer and the same TRP.
  • measurements e.g., DL PRS-RSRP measurements
  • the UE may indicate which measurements associated with the same DL PRS Rx beam index have been performed using the same spatial domain filter for reception. These measurements are derived from DL PRS resources in DL PRS resource sets associated with a same positioning frequency
  • the UE when the UE reports measurements (e.g., DL PRS-RSRP measurements) from or based on DL PRS resource sets associated with the same TRP (e.g., associated with the same TRP ID) , the UE may indicate which measurements associated with the same DL PRS Rx beam index have been performed using the same spatial domain filter for reception. These measurements are derived from DL PRS resources in DL PRS resource sets associated with a same TRP. Furthermore, the DL PRS Rx beam index is reported only if there are at least 2 measurements associated with DL PRS Rx beam index within DL PRS resource sets associated with the same TRP.
  • measurements e.g., DL PRS-RSRP measurements
  • the UE may indicate which measurements associated with the same DL PRS Rx beam index have been performed using the same spatial domain filter for reception. These measurements are derived from DL PRS resources in DL PRS resource sets associated with a same TRP.
  • the DL PRS Rx beam index is reported only if there are
  • the UE when the UE reports measurements (e.g., DL PRS-RSRP measurements) from or based on DL PRS resource sets associated with indicated positioning frequency layers and the same TRP (e.g., associated with the same TRP ID) , the UE may indicate which measurements associated with the same DL PRS Rx beam index have been performed using the same spatial domain filter for reception. These measurements are derived from DL PRS resources in DL PRS resource sets associated with indicated positioning frequency layers and a same TRP. Furthermore, the DL PRS Rx beam index is reported only if there are at least 2 measurements associated with DL PRS Rx beam index within DL PRS resource sets associated with indicated positioning frequency layers and the same TRP.
  • measurements e.g., DL PRS-RSRP measurements
  • the UE may indicate which measurements associated with the same DL PRS Rx beam index have been performed using the same spatial domain filter for reception. These measurements are derived from DL PRS resources in DL PRS resource sets associated with indicated positioning frequency layers and a same T
  • the indicated positioning frequency layers can be determined based on one of the following: a) at least one positioning frequency layer list (or set) is provided by the LMF to UE, and the positioning frequency layers within the same positioning frequency layer list (or set) are the indicated positioning frequency layers.
  • the positioning frequency layer list can also be explicitly indicated by signaling from LMF (e.g.
  • the LMF provides at least one frequency band (or frequency band list/set) to the UE to indicate that the positioning frequency layers within the same frequency band (or the same frequency band list/set) are the indicated positioning frequency layers; or c) the UE provides at least one frequency band (or frequency band list/set) to LMF (e.g., via UE capability signaling) to indicate that the positioning frequency layers within the same frequency band (or the same frequency band list/set) are the indicated positioning frequency layers.
  • the information may be provided by UE to LMF via UE capability signaling.
  • a second issue is that all DL PRS-RSRP measurements for the same TRP can be associated with the same DL PRS Rx beam index based on current design, which reduces Rx beam diversity.
  • Rx beam diversity would be beneficial for the LMF to decide which DL PRS Rx beam index is most accurate to locate the UE.
  • the UE determines that the reported measurements (e.g., DL PRS-RSRP measurements) are from or based on a single DL PRS resource set, and the maximum number of measurements associated with the same DL PRS Rx beam index to indicate a same spatial domain filter for receiving the plurality of DL PRS resources should not be larger than a value, which may be denoted as N.
  • the UE determines that the reported measurements (e.g., DL PRS-RSRP measurements) are from or based on DL PRS resource sets associated with the same positioning frequency layer and the same TRP (e.g., associated with the same TRP ID) .
  • the maximum number of the reported measurements associated with the same DL PRS Rx beam index to indicate a same spatial domain filter for receiving the DL PRS resources should not be larger than a value, denoted as N.
  • the UE determines that the reported measurements (e.g., DL PRS-RSRP measurements) are from or based on DL PRS resource sets associated with the same TRP (e.g., associated with the same TRP ID) .
  • the maximum number of the reported measurements associated with the same DL PRS Rx beam index to indicate a same spatial domain filter for receiving the DL PRS resources should not be larger than a value denoted as N.
  • the UE determines that the reported measurements (e.g., DL PRS-RSRP measurements) are from or based on DL PRS resource sets associated with indicated positioning frequency layers (which may be determined as the same mentioned in the third solution for the first issue for indicated positioning frequency layers) and the same TRP (e.g., associated with the same TRP ID) .
  • the maximum number of the reported measurements associated with the same DL PRS Rx beam index to indicate a same spatial domain filter for receiving the DL PRS resources should not be larger than a value denoted as N.
  • the value of N can be determined as a pre-defined/pre-determined/default value (e.g., 8) .
  • the value of N is based on a maximum number of measurements indicated by the LMF, which may be denoted as M.
  • M may be at least one of: a) a maximum number of measurements derived from different DL PRS resources in a single DL PRS resource set that are allowed to be included in the UE reporting message (e.g., location measurement report) ; b) a maximum number of measurements derived from different DL PRS resources in DL PRS resource sets associated with a same positioning frequency layer under the same TRP that are allowed to be included in the UE reporting message (e.g., location measurement report) ; c) a maximum number of measurements derived from different DL PRS resources in DL PRS resource sets associated with the same TRP that are allowed to be included in the reporting message; or d) a maximum number of measurements derived from different DL PRS resources in DL PRS resource sets associated with the indicated positioning frequency layers and the same TRP that are allowed to be included in the UE reporting message (e.g., location measurement report) .
  • the source RS to indicate QCL for a target DL PRS resource can be a DL PRS resource from any positioning frequency layers or a SSB from any frequency band/cell in current design.
  • the source RS is helpful for UE to receive/demodulate/equalize the target DL PRS resource.
  • the source RS and the target DL PRS resource are from different positioning frequency layers/frequency bands, it may not be possible to help UE to receive the target DL PRS resource because two RS may experience different channel impairments.
  • the received DL PRS configuration indicates that a source RS for QCL indication for a target DL PRS resource is a SSB (e.g., Synchronization Signal (SS) /Physical Broadcast Channel (PBCH) block) .
  • SSB and the target DL PRS resource are transmitted from the same serving cell.
  • the SSB and the target DL PRS resource are transmitted from the same non-serving cell.
  • the positioning frequency layer of the target DL PRS resource and the frequency of SSB are within the same frequency band (or frequency band list/set) , which may be either provided by UE to LMF or configured by LMF to UE.
  • Physical Cell ID or Cell Global ID is provided, the Physical Cell ID and Cell Global ID associated with a DL PRS ID (e.g., TRP ID) should be the same as the corresponding information associated with a SSB.
  • the received DL PRS configuration indicates that a source RS for QCL indication for a target DL PRS resource is a DL PRS resource.
  • the target DL PRS resource and source DL PRS resource are from the same positioning frequency layer (or the same positioning frequency layer list/set as mentioned in in the third solution for the first issue) and the same TRP, which may be configured by LMF to UE.
  • the target DL PRS resource and source DL PRS resource are from the same frequency band (or frequency band list/set as mentioned in in the third solution for the first issue) and the same TRP, which may be either provided by UE to LMF or configured by LMF to UE.
  • the current mechanism states that the UE may be configured by the network with Physical Cell ID, Cell Global ID, and Absolute Radio-Frequency Channel Number (ARFCN) associated with a DL PRS ID (e.g., TRP ID or gNB ID) .
  • a DL PRS ID e.g., TRP ID or gNB ID
  • the UE may assume that the DL PRS is transmitted from the serving cell. Otherwise, the UE may assume that the DL PRS is not transmitted from a serving cell. If the UE does assume that the DL PRS is transmitted from a serving cell and if the serving cell is the same as the serving cell defined by the Synchronization Signal (SS) /Physical Broadcast Channel (PBCH) block, the UE may assume that the DL PRS and the SS/PBCH block are transmitted from the same serving cell.
  • SS Synchronization Signal
  • PBCH Physical Broadcast Channel
  • the UE may assume that the DL PRS and the SS/PBCH block are transmitted from the same non-serving cell.
  • a fourth issue is that the transmission power of DL PRS is configured per DL PRS resource set. Put differently, all DL PRS resources within the same DL PRS resource set are transmitted with the same transmission power. However, a single TRP may be configured to transmit more than one DL PRS resource sets with different transmission powers. In a location measurement report of one TRP (e.g., a measurement element in the location measurement report) , multiple DL PRS-RSRP measurements can be reported, but it can be difficult to differentiate whether different DL PRS-RSRP measurements are caused by different transmission powers or different transmission beams based on the current design if DL PRS-RSRP measurements are measured/derived from different DL PRS resource sets associated with the TRP.
  • a location measurement report of one TRP e.g., a measurement element in the location measurement report
  • the received DL PRS configuration indicates that all DL PRS resource sets associated with the same TRP are each configured with the same transmission power, such that all DL PRS resources associated with the same TRP are transmitted with the same transmission power.
  • the same transmission power means that average EPRE of the resource elements for a DL PRS resource transmission is common for all DL PRS resources associated with the same TRP.
  • the UE may report multiple measurements in a measurement element (e.g., a TRP) of a location measurement report.
  • the UE may report an absolute measurement (with a unit of dBm) and one or more additional measurements that are derived relative to the absolute measurement.
  • the values of these additional measurements are either greater than, equal to, or less than zero.
  • the reported measurements are DL PRS-RSRP measurements
  • the absolute measurement is an absolute DL PRS-RSRP value based on the reception of a DL PRS resource.
  • the UE may also report additional DL PRS-RSRP measurements, each of which is acquired from an additional DL PRS-RSRP value (based on the reception of another DL PRS resource) relative to the absolute DL PRS-RSRP value.
  • the unit of the additional DL PRS-RSRP measurement is dB and the corresponding value can be no less than zero or smaller than zero, which means that the additional DL PRS-RSRP value can be no less than the absolute DL PRS-RSRP value or smaller than the absolute DL PRS-RSRP value.
  • the UE may report multiple measurements (e.g., DL PRS-RSRP measurements) in a measurement element (e.g., a TRP) of a location measurement report.
  • the UE should report the multiple measurements in at least one measurement set.
  • a measurement set may include: a) an absolute measurement (the unit of which is dBm) that is an absolute value based on the reception of DL PRS resource (s) ; and b) at least one additional measurement, each of which is acquired from an additional value relative to the absolute value.
  • the unit of this additional measurement is dB and the corresponding value is no less than zero.
  • the measurement set includes measurements derived from DL PRS resources in a single DL PRS resource set.
  • the number of additional measurement sets may be equal to the number of DL PRS resource sets associated with the TRP.
  • the LMF may also provide a signaling that indicates the maximum number of measurements based on the same DL PRS resource set is allowed to be reported in a location measurement report.
  • two DL PRS resource sets are transmitted from the same TRP, with each DL PRS resource set including 4 DL PRS resources, and the LMF indicates the maximum number of DL PRS-RSRP measurements based on the same DL PRS resource set can be reported in a location measurement report is 3.
  • the UE may report 6 DL PRS-RSRP measurements in a measurement element (e.g., a TRP) of a location measurement report.
  • an absolute DL PRS-RSRP measurement is RSRP 1, 1
  • a first additional DL PRS-RSRP measurement is acquired from RSRP 1, 3 relative to RSRP 1, 1
  • a second additional DL PRS-RSRP measurement is acquired from RSRP 1, 4 relative to RSRP 1, 1
  • an absolute DL PRS-RSRP measurement is RSRP 2, 2
  • a first additional DL PRS-RSRP measurement is acquired from RSRP 2, 1 relative to RSRP 2, 2
  • a second additional DL PRS-RSRP measurement is acquired from RSRP 2, 4 relative to RSRP 2, 2 .
  • DL PRS resource set ID DL PRS resource ID DL PRS-RSRP value 1 1 RSRP 1, 1 1 2 RSRP 1, 2 1 3 RSRP 1, 3 1 4 RSRP 1, 4 2 1 RSRP 2, 1 2 2 RSRP 2, 2 2 3 RSRP 2, 3 2 4 RSRP 2, 4
  • the UE can report path loss that DL PRS has experienced during transmission from TRP to UE.
  • the path loss may be defined as the power ratio between the transmission power of a DL PRS resource and the reception power (e.g., DL PRS-RSRP value) of the DL PRS resource.
  • the UE can report scaling RSRP, which takes into account the transmission power of a DL PRS resource and the reception power (e.g., DL PRS-RSRP value) of the DL PRS resource.
  • RSRP scaling RSRP
  • the reception powers of the two DL PRS resources are 10dBm (denoted as RP1) and 12 dBm (denoted by RP2) respectively.
  • the reported scaling RSRP for resource1 can be at least one of: a) the absolute transmission power, which is equal to either TP1-RP1 (e.g., 20) or RP1-TP1 (e.g., -20) ; or b) the relative transmission power between the two DL PRS resource sets, which may be given as either (TP1-TP2) -RP1 (e.g., -5) or RP1- (TP1-TP2) (e.g., 5) .
  • the reported scaling RSRP for resource2 can be at least one of: a) the absolute transmission power, which is equal to either TP2-RP2 (e.g., 13) or RP2-TP2 (e.g., -13) ; or b) the relative transmission power between the two DL PRS resource sets, which may be given as either (TP1-TP2) -RP2 (e.g., -8) or RP2- (TP1-TP2) (e.g., 8) .
  • FIG. 4A is a flowchart diagram illustrating an example wireless communication method 400, according to various arrangements.
  • Method 400 can be performed by a User Equipment (UE) , and begins at 410 where the UE receives, from a Location Management Function (LMF) , a Downlink Positioning Reference Signal (DL PRS) configuration. Then, at 420, the UE sends to the LMF a message that includes measurements of a plurality of DL PRS resources according to the DL PRS configuration.
  • LMF Location Management Function
  • DL PRS Downlink Positioning Reference Signal
  • the method 400 further includes indicating, in the message, that the measurements that are associated with a same DL PRS receiving beam index performed using a same spatial domain filter for receiving the plurality of DL PRS resources.
  • the measurements are derived from the plurality of DL PRS resources in DL PRS resource sets associated with a same positioning frequency layer and a same transmission-reception point (TRP) .
  • the method 400 further includes indicating, in the message, that the measurements that are associated with a same DL PRS receiving beam index have been performed using a same spatial domain filter for receiving the plurality of DL PRS resources.
  • the plurality of the measurements are derived from the plurality of DL PRS resources in DL PRS resource sets associated with a same TRP.
  • the method 400 further includes indicating, in the message, that the measurements that are associated with a same DL PRS receiving beam index have been performed using a same spatial domain filter for receiving the plurality of DL PRS resources.
  • the measurements are derived from the plurality of DL PRS resources in DL PRS resource sets associated with the indicated positioning frequency layers and a same TRP.
  • the method 400 further includes determining the indicated positioning frequency layers based on at least one of: a) determining that the indicated positioning frequency layers are included in a positioning frequency layer list; or b) determining that the indicated positioning frequency layers are included in a frequency band or a frequency band list.
  • the method 400 further includes determining, in the message, that the measurements are derived from the plurality of DL PRS resources in a single DL PRS resource set.
  • a maximum number of the measurements associated with a same DL PRS receiving beam index to indicate a same spatial domain filter for receiving the plurality of DL PRS resources should not be greater than a value (N) .
  • the method 400 further includes determining, in the message, that the measurements are derived from the plurality of DL PRS resources in DL PRS resource sets associated with a same positioning frequency layer and a same TRP.
  • a maximum number of the measurements associated with a same DL PRS receiving beam index to indicate a same spatial domain filter for receiving the plurality of DL PRS resources should not be greater than a value (N) .
  • the method 400 further includes determining, in the message, that the measurements are derived from the plurality of DL PRS resources in DL PRS resource sets associated with a same TRP.
  • a maximum number of the measurements associated with a same DL PRS receiving beam index to indicate a same spatial domain filter for receiving the plurality of DL PRS resources should not be greater than a value (N) .
  • the method 400 further includes determining, in the message, that the measurements are derived from the plurality of DL PRS resources in DL PRS resource sets associated with indicated positioning frequency layers and a same TRP.
  • a maximum number of the measurements associated with a same DL PRS receiving beam index to indicate a same spatial domain filter for receiving the plurality of DL PRS resources should not be greater than a value (N) .
  • the value (N) is a default value. In other of these embodiments, the value (N) is determined based on a maximum number of measurements (M) indicated by the wireless communication element, wherein the maximum number of measurements is at least one of: a) a maximum number of measurements derived from different DL PRS resources in a single DL PRS resource set that are allowed to be included in the message; b) a maximum number of measurements derived from different DL PRS resources in DL PRS resource sets associated with a same positioning frequency layer and a same TRP that are allowed to be included in the message; c) a maximum number of measurements derived from different DL PRS resources in DL PRS resource sets associated with a same TRP that are allowed to be included in the message; or d) a maximum number of measurements derived from different DL PRS resources in DL PRS resource sets associated with indicated positioning frequency layers and a same TRP that are allowed to be included in the message.
  • M maximum number of measurements indicated by the wireless communication element
  • the DL PRS configuration indicates that a source reference signal of Quasi Co-Location (QCL) for a target DL PRS resource of the plurality of DL PRS resources is a combination of Synchronization Signal and Physical Broadcast Channel Block (SSB) .
  • the SSB and the target DL PRS resource are transmitted from a same serving cell.
  • the SSB and the target DL PRS resource are transmitted from a same non-serving cell.
  • a frequency of the SSB and a positioning frequency layer of the target DL PRS resource are within a same frequency band or a same frequency band list.
  • the DL PRS configuration indicates that a source reference signal of QCL for a target DL PRS resource of the plurality of DL PRS resources is one of the plurality of DL PRS resources.
  • the source reference signal and the target DL PRS resource are associated with a same positioning frequency layer or a same positioning frequency layer list and a same TRP.
  • the source reference signal and the target DL PRS resource are associated with a same frequency band or a same frequency band list and a same TRP.
  • the DL PRS configuration indicates that a plurality of DL PRS resource sets associated with a same TRP are each configured with a same transmission power.
  • some of the measurements associated with a same TRP include an absolute measurement and one or more additional measurements that are derived relative to the absolute measurement, and the one or more additional measurements is greater than, equal to, or less than zero.
  • the measurements each include a reference signal receive power (RSRP) of a corresponding one of the DL PRS resources.
  • RSRP reference signal receive power
  • some of the measurements associated with a same TRP include one or more measurement sets, each of the measurements sets including an absolute measurement and one or more additional measurements that are derived relative to the absolute measurement.
  • the measurement set includes measurements derived from DL PRS resources in a single DL PRS resource set.
  • FIG. 4B is a flowchart diagram illustrating an example wireless communication method 450, according to various arrangements.
  • Method 450 can be performed by LMF, and begins at 460 where the LMF sends, to the UE, a DL PRS configuration. Then, at 470, the LMF receives, from the UE, a message that includes measurements of a plurality of DL PRS resources according to the DL PRS configuration.
  • any reference to an element herein using a designation such as “first, “ “second, “ and so forth does not generally limit the quantity or order of those elements. Rather, these designations can be used herein as a convenient means of distinguishing between two or more elements or instances of an element. Thus, a reference to first and second elements does not mean that only two elements can be employed, or that the first element must precede the second element in some manner.
  • any of the various illustrative logical blocks, modules, processors, means, circuits, methods and functions described in connection with the aspects disclosed herein can be implemented by electronic hardware (e.g., a digital implementation, an analog implementation, or a combination of the two) , firmware, various forms of program or design code incorporating instructions (which can be referred to herein, for convenience, as "software” or a "software module) , or any combination of these techniques.
  • firmware e.g., a digital implementation, an analog implementation, or a combination of the two
  • firmware various forms of program or design code incorporating instructions
  • software or a “software module”
  • IC integrated circuit
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • the logical blocks, modules, and circuits can further include antennas and/or transceivers to communicate with various components within the network or within the device.
  • a general purpose processor can be a microprocessor, but in the alternative, the processor can be any conventional processor, controller, or state machine.
  • a processor can also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other suitable configuration to perform the functions described herein.
  • Computer-readable media includes both computer storage media and communication media including any medium that can be enabled to transfer a computer program or code from one place to another.
  • a storage media can be any available media that can be accessed by a computer.
  • such computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer.
  • module refers to software, firmware, hardware, and any combination of these elements for performing the associated functions described herein. Additionally, for purpose of discussion, the various modules are described as discrete modules; however, as would be apparent to one of ordinary skill in the art, two or more modules may be combined to form a single module that performs the associated functions according embodiments of the present solution.
  • memory or other storage may be employed in embodiments of the present solution.
  • memory or other storage may be employed in embodiments of the present solution.
  • any suitable distribution of functionality between different functional units, processing logic elements or domains may be used without detracting from the present solution.
  • functionality illustrated to be performed by separate processing logic elements, or controllers may be performed by the same processing logic element, or controller.
  • references to specific functional units are only references to a suitable means for providing the described functionality, rather than indicative of a strict logical or physical structure or organization.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de communication sans fil consistant à recevoir, par un dispositif de communication sans fil en provenance d'un élément de communication sans fil, une configuration de signal de référence de positionnement en liaison descendante (PRS DL) ; et envoyer, par le dispositif de communication sans fil à l'élément de communication sans fil, un message comprenant des mesures d'une pluralité de ressources de PRS DL selon la configuration de PRS DL.
PCT/CN2021/105702 2021-07-12 2021-07-12 Systèmes et procédés de positionnement en liaison descendante Ceased WO2023283755A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020193853A1 (fr) * 2019-03-26 2020-10-01 Nokia Technologies Oy Mesures pour une transmission de signal de référence de positionnement à la demande
CN112769531A (zh) * 2019-11-05 2021-05-07 维沃移动通信有限公司 定位参考信号的配置方法及装置

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WO2020193853A1 (fr) * 2019-03-26 2020-10-01 Nokia Technologies Oy Mesures pour une transmission de signal de référence de positionnement à la demande
CN112769531A (zh) * 2019-11-05 2021-05-07 维沃移动通信有限公司 定位参考信号的配置方法及装置

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HUAWEI, HISILICON: "Maintenance of physical layer procedures to support positioning measurements", 3GPP DRAFT; R1-2001561, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Online Meeting ;20200420 - 20200430, 11 April 2020 (2020-04-11), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051875152 *
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