WO2024073998A1 - Support de ltm - Google Patents

Support de ltm Download PDF

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Publication number
WO2024073998A1
WO2024073998A1 PCT/CN2023/075883 CN2023075883W WO2024073998A1 WO 2024073998 A1 WO2024073998 A1 WO 2024073998A1 CN 2023075883 W CN2023075883 W CN 2023075883W WO 2024073998 A1 WO2024073998 A1 WO 2024073998A1
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WO
WIPO (PCT)
Prior art keywords
csi
resource
csi report
ssb
frequency
Prior art date
Application number
PCT/CN2023/075883
Other languages
English (en)
Inventor
Bingchao LIU
Chenxi Zhu
Lingling Xiao
Yi Zhang
Wei Ling
Original Assignee
Lenovo (Beijing) 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.)
Filing date
Publication date
Application filed by Lenovo (Beijing) Ltd. filed Critical Lenovo (Beijing) Ltd.
Priority to PCT/CN2023/075883 priority Critical patent/WO2024073998A1/fr
Publication of WO2024073998A1 publication Critical patent/WO2024073998A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H04W36/0094—Definition of hand-off measurement parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic

Definitions

  • the subject matter disclosed herein generally relates to wireless communications, and more particularly relates to methods and apparatuses for support of L1/L2 triggered mobility (LTM) .
  • LTM L1/L2 triggered mobility
  • New Radio NR
  • VLSI Very Large Scale Integration
  • RAM Random Access Memory
  • ROM Read-Only Memory
  • EPROM or Flash Memory Erasable Programmable Read-Only Memory
  • CD-ROM Compact Disc Read-Only Memory
  • LAN Local Area Network
  • WAN Wide Area Network
  • UE User Equipment
  • eNB Evolved Node B
  • gNB Next Generation Node B
  • Uplink UL
  • Downlink DL
  • CPU Central Processing Unit
  • GPU Graphics Processing Unit
  • FPGA Field Programmable Gate Array
  • OFDM Orthogonal Frequency Division Multiplexing
  • RRC Radio Resource Control
  • RX User Entity/Equipment
  • TX Receiver
  • Base station BS
  • layer 1 Layer 1
  • L1 measurements based on CSI reporting framework are used for LTM. It means that the UE can be configured to measure the quality of different candidate cells in layer 1 and report the measurement results of the candidate cells to the serving cell in one or more CSI reports. If the UE reports that one of the candidate cells is better than the current serving cell, the gNB can indicate a LTM command (e.g., in layer 2) to the UE to indicate the UE to switch to a candidate cell based on the measurement results.
  • LTM command e.g., in layer 2
  • intra-frequency LTM the candidate cells and the serving cell are in the same frequency.
  • inter-frequency LTM the candidate cells are located in a frequency different from the frequency of the serving cell.
  • This invention targets behaviors of UE and gNB for LTM.
  • a UE comprises a transceiver; and a processor coupled to the transceiver, wherein the processor is configured to receive, via the transceiver, a configuration for a CSI report, wherein, at least one of reference resources for channel measurement configured for the CSI report is associated with a candidate cell configuration; and transmit, via the transceiver, the CSI report including a measurement result of one or more candidate cells.
  • the processor is further configured to report, via the transceiver, a value of RF switching gap for each frequency or band combination for LTM.
  • the processor is further configured to receive, via the transceiver, a configuration to configure a first RF switching gap and/or a second RF switching gap when the frequency of the reference resources for the CSI report is different from the frequency of any BWP of the serving cell.
  • Each of the first RF switching gap and the second RF switching gap may be configured as a number of symbols with reference to SCS of the active BWP of the serving cell configuring or triggering the CSI report or of the BWP in which the CSI report is transmitted.
  • each candidate cell configuration configures the parameters including at least one of center frequency of the SSB; subcarrier spacing of the SSB; subframe offset of candidate cell; periodicity of the SSB; SSB positions in a SSB burst; and transmit power of the SSB.
  • each candidate cell configuration may further configure one or more CSI-RS resources, or one or more CSI-RS resource set, each of which includes one or more CSI-RS resources, for LTM and configure the parameters for each CSI-RS resource including at least one of center frequency of the CSI-RS resource; subcarrier spacing of the CSI-RS resource; periodicity and slot offset of the periodic CSI-RS resource; QCL information of the CSI-RS resource; first OFDM symbol in the slot for transmission of the CSI-RS resource; RE position of the CSI-RS resource in a PRB; sequence for CSI-RS resource sequence initialization; density of the CSI-RS resource; transmit power offset of the CSI-RS resource relative to the transmit power of the SSB in the same candidate cell; and bandwidth of the CSI-RS resource, wherein, each CSI-RS resource is assumed to be a single-port CSI-RS resource.
  • all the reference resources configured for the CSI report are in the same frequency.
  • all the reference resources configured for the CSI report have the same SCS.
  • the processor when the frequency of reference resources configured for the CSI report are covered by one or more configured BWPs of at least one serving cell, is further configured to receive, via the transceiver, a BWP switching command to switch DL RF of the UE to a BWP that covers the frequency of reference resources configured for the CSI report before receiving, via the transceiver, a first symbol of a first reference resource configured for the CSI report, wherein, the BWP has the same SCS as the SCS of the reference resources configured for the CSI report.
  • the first RF switching gap is located before a DL slot determined as the CSI reference resource associated with the CSI report, and the second RF switching gap is located after the DL slot. In some other embodiment, the first RF switching gap is located before a first symbol of a first reference resource configured for the CSI report, and the second RF switching gap is located after a last symbol of a last reference resource configured for the CSI report.
  • a method performed at a UE comprises receiving a configuration for a CSI report, wherein, at least one of reference resources for channel measurement configured for the CSI report is associated with a candidate cell configuration; and transmitting the CSI report including a measurement result of one or more candidate cells.
  • a base unit comprises a transceiver; and a processor coupled to the transceiver, wherein the processor is configured to transmit, via the transceiver, a configuration for a CSI report, wherein, at least one of reference resources for channel measurement configured for the CSI report is associated with a candidate cell configuration; and receive, via the transceiver, the CSI report including a measurement result of one or more candidate cells.
  • a method performed at a base unit comprises transmitting a configuration for a CSI report, wherein, at least one of reference resources for channel measurement configured for the CSI report is associated with a candidate cell configuration; and receiving the CSI report including a measurement result of one or more candidate cells
  • Figure 1 illustrates an example of CSI measurement for Scenario#1 in LTM according to a first sub-embodiment of a second embodiment
  • Figure 2 illustrates an example for CSI measurement and report for Scenario#2 for LTM according to a second sub-embodiment of the second embodiment
  • Figure 3 illustrates another example for CSI measurement and report for Scenario#2 for LTM according to a second sub-embodiment of the second embodiment
  • Figure 4 is a schematic flow chart diagram illustrating an embodiment of a method
  • Figure 5 is a schematic flow chart diagram illustrating an embodiment of another method.
  • Figure 6 is a schematic block diagram illustrating apparatuses according to one embodiment.
  • embodiments may be embodied as a system, apparatus, method, or program product. Accordingly, embodiments may take the form of an entirely hardware embodiment, an entirely software embodiment (including firmware, resident software, micro-code, etc. ) or an embodiment combining software and hardware aspects that may generally all be referred to herein as a “circuit” , “module” or “system” . Furthermore, embodiments may take the form of a program product embodied in one or more computer readable storage devices storing machine-readable code, computer readable code, and/or program code, referred to hereafter as “code” .
  • code computer readable storage devices storing machine-readable code, computer readable code, and/or program code, referred to hereafter as “code” .
  • the storage devices may be tangible, non-transitory, and/or non-transmission.
  • the storage devices may not embody signals. In a certain embodiment, the storage devices only employ signals for accessing code.
  • modules may be implemented as a hardware circuit comprising custom very-large-scale integration (VLSI) circuits or gate arrays, off-the-shelf semiconductors such as logic chips, transistors, or other discrete components.
  • VLSI very-large-scale integration
  • a module may also be implemented in programmable hardware devices such as field programmable gate arrays, programmable array logic, programmable logic devices or the like.
  • Modules may also be implemented in code and/or software for execution by various types of processors.
  • An identified module of code may, for instance, include one or more physical or logical blocks of executable code which may, for instance, be organized as an object, procedure, or function. Nevertheless, the executables of an identified module need not be physically located together, but, may include disparate instructions stored in different locations which, when joined logically together, include the module and achieve the stated purpose for the module.
  • a module of code may contain a single instruction, or many instructions, and may even be distributed over several different code segments, among different programs, and across several memory devices.
  • operational data may be identified and illustrated herein within modules and may be embodied in any suitable form and organized within any suitable type of data structure. This operational data may be collected as a single data set, or may be distributed over different locations including over different computer readable storage devices.
  • the software portions are stored on one or more computer readable storage devices.
  • the computer readable medium may be a computer readable storage medium.
  • the computer readable storage medium may be a storage device storing code.
  • the storage device may be, for example, but need not necessarily be, an electronic, magnetic, optical, electromagnetic, infrared, holographic, micromechanical, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing.
  • a storage device would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, random access memory (RAM) , read-only memory (ROM) , erasable programmable read-only memory (EPROM or Flash Memory) , portable compact disc read-only memory (CD-ROM) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
  • a computer-readable storage medium may be any tangible medium that can contain or store a program for use by or in connection with an instruction execution system, apparatus, or device.
  • Code for carrying out operations for embodiments may include any number of lines and may be written in any combination of one or more programming languages including an object-oriented programming language such as Python, Ruby, Java, Smalltalk, C++, or the like, and conventional procedural programming languages, such as the "C" programming language, or the like, and/or machine languages such as assembly languages.
  • the code may be executed entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server.
  • the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN) , or the connection may be made to an external computer (for example, through the Internet using an Internet Service Provider) .
  • LAN local area network
  • WAN wide area network
  • Internet Service Provider an Internet Service Provider
  • the code may also be stored in a storage device that can direct a computer, other programmable data processing apparatus, or other devices, to function in a particular manner, such that the instructions stored in the storage device produce an article of manufacture including instructions which implement the function specified in the schematic flowchart diagrams and/or schematic block diagrams block or blocks.
  • the code may also be loaded onto a computer, other programmable data processing apparatus, or other devices, to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the code executed on the computer or other programmable apparatus provides processes for implementing the functions specified in the flowchart and/or block diagram block or blocks.
  • each block in the schematic flowchart diagrams and/or schematic block diagrams may represent a module, segment, or portion of code, which includes one or more executable instructions of the code for implementing the specified logical function (s) .
  • a first embodiment relates to candidate cell configuration.
  • Each candidate cell may have a dedicate configuration, which can be referred to as candidate cell configuration.
  • the candidate cell configuration has a configuration index, and configures the essential information for the candidate cell.
  • the essential information may refer to the information necessary for the UE to perform L1 measurement.
  • SSB resources or CSI-RS resources can be configured as the channel measurement resources for beam measurement of the candidate cell for LTM. Since both intra-frequency LTM and inter-frequency LTM are supported for LTM, the center frequency and the SCS of the measurement resource, i.e., the SSB or CSI-RS resource, can be different from the center frequency and the SCS of the active BWP of the serving cell.
  • a configuration index (CandidateCellConfigId) is included.
  • SSB When SSB is configured for L1 measurement, at least one of the following SSB-related parameters may be included in the candidate cell configuration:
  • ssbFrequency the center frequency of the SSB. Note that SSB is transmitted in a frequency range that is indicated by the center frequency of the frequency range.
  • ssbSubcarrierSpacing the subcarrier spacing (SCS) of the SSB.
  • SFNOffset the subframe number offset of the candidate cell with reference the current subframe number of the active BWP of the serving cell.
  • ssbperiodicity the periodicity of the SSB.
  • ssb-PositionsInBurst the SSB positions in a SSB burst.
  • Each SSB burst consists of one or more SSBs.
  • ss-PBCH-BlockPower the transmit power of the SSB, which is necessary if the transmit power of the CSI-RS resource is necessary to be obtained when CSI-RS resources are configured for candidate cell measurement.
  • the candidate cell configuration includes the CSI-RS-related parameters, in addition to the SSB-related parameters.
  • Multiple CSI-RS resources or multiple CSI-RS resource sets (where each CSI-RS resource set may include one or multiple CSI-RS resources) for LTM measurements can be configured in each candidate cell configuration.
  • Each CSI-RS resource set can be identified by a CSI-RS resource set index (CSI-RS-RecouceSetId) .
  • Each CSI-RS resource can be identified by a CSI-RS resource index (CSI-RS-ResourceId) .
  • At least one of the following parameters can be configured:
  • CSI-RS-Frequency the center frequency of the CSI-RS resource.
  • CSI-RS-SubcarrierSpacing the subcarrier spacing (SCS) of the CSI-RS resource.
  • slotConfig if the CSI-RS resource is periodic CSI-RS, the slotConfig indicates the periodicity and the slot offset of the periodic CSI-RS.
  • each CSI-RS resource is QCLed with a SSB resource of the same candidate cell.
  • the QCL-Info indicates a SSB in the same candidate cell for the UE to determine the spatial domain Rx filter for the CSI-RS resource, which can be referred to as QCL information of the CSI-RS resource.
  • firstOFDMSymbolInTimeDomain the first OFDM symbol in the slot for transmission of the CSI-RS resource.
  • frequencyDomainAllocation the RE position of the CSI-RS resource in a PRB.
  • sequenceGenerationConfig the sequence for CSI-RS resource sequence initialization.
  • density the density of the CSI-RS resource, i.e., the number of REs for CSI-RS transmission in a PRB.
  • powerControlOffsetSS the transmit power offset of the CSI-RS resource relative to the transmit power of the SSB in the same candidate cell.
  • the bandwidth the bandwidth of the CSI-RS resource.
  • the ‘startPRB’ indicates the start PRB index of the CSI-RS resource.
  • the ‘nofPRBS’ indicates the number of PRBs of the CSI-RS resource.
  • each CSI-RS resource is assumed to be a single-port CSI-RS resource.
  • CSI report configured for LTM, SSB or CSI-RS resources, each of which is associated with a candidate cell configuration index, can be configured as the channel measurement resource (CMR) of the CSI report.
  • CMR channel measurement resource
  • a UE when a UE receives a configuration of a CSI report including SSB or CSI-RS resources, each of which is associated with a candidate cell configuration index, configured as the channel measurement resource, the UE measures the channel measurement resource (i.e., the SSB or CSI-RS resources) , and sends the measurement result of the candidate cells to the gNB in the CSI report. If a SSB or CSI-RS resource is configured without being associated with candidate cell configuration index, the UE assumes the SSB or CSI-RS resource is associated with the serving cell.
  • the channel measurement resource i.e., the SSB or CSI-RS resources
  • a RF switching gap is necessary for the UE to switch its DL RF to the frequency of the SSB or CSI-RS resources configured in the CMR to receive and measure the SSB or CSI-RS resources.
  • a second embodiment relates to the RF switching gap.
  • the LTM is performed based on CSI framework and the measurement gap used in L3 mobility is not needed.
  • the RF switching gap is needed for the UE to receive the configured SSB or CSI-RS resources in a frequency different from the frequency of serving cell.
  • the UE shall firstly determine a slot for the reception of the configured SSB or CSI-RS resources of the candidate cells based on CSI reference resource framework and apply a RF switching gap before and optionally after the reception of the configured SSB or CSI-RS resources of the candidate cells to specify the UE and gNB behavior.
  • the RF switching gap before the reception of the configured SSB or CSI-RS resources can be referred to as a first RF switching gap; and the RF switching gap after the reception of the configured SSB or CSI-RS resources can be referred to as a second RF switching gap. Therefore, the RF switching gap (the first RF switching gap and optionally the second RF switching gap) should be explicitly determined to specify the UE behavior in physical layer (i.e., layer 1) .
  • the RF switching gap should be configured for the CSI report when the frequency of the SSB or CSI-RS resources configured for the CSI report is different from the frequency of the serving cell. It can be configured as X symbols or X ms, where X is a positive integer. The X symbols can be determined according to a reference SCS.
  • the reference SCS may be determined by the active BWP of the serving cell configuring or triggering the CSI report, or by the BWP in which the CSI report is sent to the gNB.
  • the first RF switching gap and the second RF switching gap may be separately configured.
  • the first RF switching gap may be configured as X1 symbols or X1 ms, where X1 is a positive integer; and the second RF switching gap may be configured as X2 symbols or X2 ms, where X2 is a positive integer.
  • the UE shall report the required RF switching gap for different frequency or band combinations, e.g., in capability reporting.
  • the UE shall determine a downlink slot n -n CSI-ref to receive the SSB or CSI-RS resources associated with a CSI report, where n’ is the uplink slot in which the CSI report is reported (i.e., transmitted) to the gNB, and and are the subcarrier spacing configurations for DL and UL, respectively.
  • n CSI-ref is a predetermined number of slots.
  • the UE should switch the DL RF to the frequency of the SSB or CSI-RS resources configured for the CSI report before the reception of SSB or CSI-RS resources configured for the CSI report, so that correct measurement results can be obtained.
  • Scenario#1 The frequency of the SSB or CSI-RS resources configured for the CSI report is not covered by any of the active BWPs of SpCell and Scells configured for a UE but is covered by some (i.e., at least one) of the configured BWPs of SpCell and Scells configured for the UE.
  • SpCell is the Primary cell of the master cell group (MCG) and/or the primary cell of the secondary cell group (SCG) .
  • Scell is the serving cells other than SpCell of MCG and/or SCG.
  • Scenario#2 The frequency of the SSB or CSI-RS resources configured for the CSI report is not covered by any of the configured BWPs of SpCell and Scells configured for a UE.
  • a first sub-embodiment of the second embodiment relates to Scenario#1.
  • the RF switching gap can be implemented by a BWP switching gap in view that the BWP switching gap can cover the RF switching gap.
  • the UE before the UE receives the SSB or CSI-RS resources configured for the CSI report, the UE expects to be indicated to switch to a configured BWP of SpCell or Scells configured for the UE that covers the frequency of the SSB or CSI-RS resources configured for the CSI report.
  • the gNB can directly configure the UE to transmit the CSI report in a BWP of the SpCell and Scells configured for the UE that covers the frequency of the SSB or CSI-RS resources configured for the CSI report.
  • the gNB can further indicate the UE to switch the UL RF to frequency of the BWP containing the UL resource for the CSI report.
  • the DL RF switching does not affect the UL RF. It means that the UL RF switching may be unnecessary in FDD system.
  • the first sub-embodiment proposes that the indicated BWP that covers the frequency of the SSB or CSI-RS resources configured for the CSI report has the same SCS and the same SFN offset as the SCS and the SFN offset for the SSB or CSI-RS resources configured for the CSI report.
  • FIG. 1 An example of CSI measurement and report for Scenario#1 in LTM according to the first sub-embodiment is illustrated in Figure 1.
  • the UE is configured with a CSI report associated with a set of SSB resources associated with LTM candidate cells.
  • the frequency of the SSBs is not covered by the active BWP#1 but is covered by BWP#2, which is inactive, of a serving cell.
  • DL slot n-k i.e., slot n -n CSI-ref
  • slot n-k is the slot in which the SSB resources associated with the CSI report are received by the UE.
  • the gNB Before the UE receives the SSB resources associated with the CSI report, the gNB sends a DCI#1 in the active BWP#1 to the UE to switch the DL RF of the UE to BWP#2 to receive the SSB resources associated with the CSI report.
  • the gNB can optionally further send another DCI (e.g., DCI#2) in BWP#2 to the UE after the UE receives the SSB resources associated with the CSI report, where DCI#2 indicates the UE to switch the UL RF to the BWP (e.g., BWP#1) for transmission of the CSI report, if the UL RF is changed due to the changed DL RF.
  • DCI#2 indicates the UE to switch the UL RF to the BWP (e.g., BWP#1) for transmission of the CSI report, if the UL RF is changed due to the changed DL RF.
  • the RF switching gap is covered by the BWP switching gap indicated by DCI#1 and optionally DCI #2. That is, a first RF switching gap before the reception of the SSB resources associated with the CSI report is covered by the BWP switching gap indicated by the TDRA field of DCI#1, and a second RF switching gap, if necessary, after the reception of the SSB resources associated with the CSI report is covered by the BWP switching gap indicated by DCI#2.
  • the SSB or CSI-RS resources for measurement configured in the CMR of the CSI report for LTM may be associated with different candidate cells. If the frequency of one of the SSB or CSI-RS resources is covered by another configured BWP of one serving cell, which is different from BWP#2, another BWP switching is required for receiving the corresponding SSB or CSI-RS resource.
  • the first sub-embodiment proposes to introduce the following restrictions:
  • All the frequency (ies) of the SSB or CSI-RS resources for measurement associated with a same CSI report should be covered by a same configured BWP of a serving cell.
  • All the SSB or CSI-RS resources for measurement associated with candidate cells have the same SCS.
  • the BWP that covers the frequency of the SSB or CSI-RS resources configured for the CSI report has the same SCS as the SCS for SSB or CSI-RS resources configured for the CSI report.
  • a second sub-embodiment of the second embodiment relates to Scenario#2.
  • the UE For scenario#2, the UE requires an explicit RF switching gap to switch to the measurement frequency for reception of the SSB or CSI-RS resources configured for the CSI report. Similar to the first sub-embodiment related to scenario#1, the UE should complete the RF switching before the reception of the SSB or CSI-RS resources configured for the CSI report.
  • FIG. 2 An example for CSI measurement and report for Scenario#2 for LTM according to the second sub-embodiment is illustrated in Figure 2.
  • the serving cell is in frequency#1 and the SSBs of some candidate cells are in another frequency#2.
  • the gNB that manages the serving cell sends a DCI in the serving cell triggering a CSI report in uplink slot n’ (corresponding to downlink slot n) and the CSI report is associated with a set of SSB resources of candidate cells in frequency#2.
  • the UE firstly determines a CSI reference resource DL slot n -n CSI-ref for the reception of the SSB resources associated with the triggered CSI report. Because frequency#2 is different from frequency#1, the UE requires a first RF switching gap to switch its DL RF to frequency#2 to receive the SSB resources associated with the triggered CSI report and optionally a second RF switching gap to switch its UL RF to frequency#1 to transmit the CSI report including the measurement results, if the UL RF is changed due to the change of the DL RF.
  • the first RF switching gap e.g., switchingTimeDL
  • the second RF switching gap e.g., switchingTimeUL
  • Figure 3 illustrates another example for CSI measurement and report for Scenario#2 in LTM according to the second sub-embodiment.
  • Figure 3 differs from Figure 2 in the location of the RF switching gaps.
  • the first RF switching gap e.g., switchingTimeDL
  • the optional second RF switching gap e.g., switchingTimeUL
  • the optional second RF switching gap is located after a last symbol of reception of a last SSB (e.g., SSB#N) in the CSI reference resource DL slot n -n CSI-ref .
  • the UE During the time duration in which the UE receives the SSB or CSI-RS resources configured for the CSI report in frequency#2 and the RF switching gap (including both the first RF switching gap and the second RF switching gap) , the UE shall not receive any DL signal in any serving cell in frequency#1, and all the UL transmission in the serving cells in frequency#1 may be temporarily suspended.
  • the SSB or CSI-RS resources configured in CMR of a CSI report for LTM may be associated with different candidate cells.
  • the second sub-embodiment proposes that all the SSB or CSI-RS resources configured in the CMR for a CSI report for LTM are in a same frequency.
  • each RS may have the same SCS or a different SCS.
  • Figure 4 is a schematic flow chart diagram illustrating an embodiment of a method 400 according to the present application.
  • the method 400 is performed by an apparatus, such as a remote unit (e.g. UE) .
  • the method 400 may be performed by a processor executing program code, for example, a microcontroller, a microprocessor, a CPU, a GPU, an auxiliary processing unit, a FPGA, or the like.
  • the method 400 is a method performed at a UE, comprising: 402 receiving a configuration for a CSI report, wherein, at least one of reference resources for channel measurement configured for the CSI report is associated with a candidate cell configuration; and 404 transmitting the CSI report including a measurement result of one or more candidate cells.
  • the method further comprises reporting a value of RF switching gap for each frequency or band combination for LTM.
  • the method further comprises receiving a configuration to configure a first RF switching gap and/or a second RF switching gap when the frequency of the reference resources for the CSI report is different from the frequency of any BWP of the serving cell.
  • Each of the first RF switching gap and the second RF switching gap may be configured as a number of symbols with reference to SCS of the active BWP of the serving cell configuring or triggering the CSI report or of the BWP in which the CSI report is transmitted.
  • each candidate cell configuration configures the parameters including at least one of center frequency of the SSB; subcarrier spacing of the SSB; subframe offset of candidate cell; periodicity of the SSB; SSB positions in a SSB burst; and transmit power of the SSB.
  • each candidate cell configuration may further configure one or more CSI-RS resources, or one or more CSI-RS resource set, each of which includes one or more CSI-RS resources, for LTM and configure the parameters for each CSI-RS resource including at least one of center frequency of the CSI-RS resource; subcarrier spacing of the CSI-RS resource; periodicity and slot offset of the periodic CSI-RS resource; QCL information of the CSI-RS resource; first OFDM symbol in the slot for transmission of the CSI-RS resource; RE position of the CSI-RS resource in a PRB; sequence for CSI-RS resource sequence initialization; density of the CSI-RS resource; transmit power offset of the CSI-RS resource relative to the transmit power of the SSB in the same candidate cell; and bandwidth of the CSI-RS resource, wherein, each CSI-RS resource is assumed to be a single-port CSI-RS resource.
  • all the reference resources configured for the CSI report are in the same frequency.
  • all the reference resources configured for the CSI report have the same SCS.
  • the method further comprises receiving a BWP switching command to switch DL RF of the UE to a BWP that covers the frequency of reference resources configured for the CSI report before receiving a first symbol of a first reference resource configured for the CSI report, wherein, the BWP has the same SCS as the SCS of the reference resources configured for the CSI report.
  • the first RF switching gap is located before a DL slot determined as the CSI reference resource associated with the CSI report, and the second RF switching gap is located after the DL slot. In some other embodiment, the first RF switching gap is located before a first symbol of a first reference resource configured for the CSI report, and the second RF switching gap is located after a last symbol of a last reference resource configured for the CSI report.
  • Figure 5 is a schematic flow chart diagram illustrating an embodiment of a method 500 according to the present application.
  • the method 500 is performed by an apparatus, such as a base unit.
  • the method 500 may be performed by a processor executing program code, for example, a microcontroller, a microprocessor, a CPU, a GPU, an auxiliary processing unit, a FPGA, or the like.
  • the method 500 may comprise 502 transmitting a configuration for a CSI report, wherein, at least one of reference resources for channel measurement configured for the CSI report is associated with a candidate cell configuration; and 504 receiving the CSI report including a measurement result of one or more candidate cells.
  • the method further comprises receiving a value of RF switching gap for each frequency or band combination for LTM.
  • the method further comprises transmitting a configuration to configure a first RF switching gap and/or a second RF switching gap when the frequency of the reference resources for the CSI report is different from the frequency of any BWP of the serving cell.
  • Each of the first RF switching gap and the second RF switching gap may be configured as a number of symbols with reference to SCS of the active BWP of the serving cell configuring or triggering the CSI report or of the BWP in which the CSI report is transmitted.
  • each candidate cell configuration configures the parameters including at least one of center frequency of the SSB; subcarrier spacing of the SSB; subframe offset of candidate cell; periodicity of the SSB; SSB positions in a SSB burst; and transmit power of the SSB.
  • each candidate cell configuration may further configure one or more CSI-RS resources, or one or more CSI-RS resource set, each of which includes one or more CSI-RS resources, for LTM and configure the parameters for each CSI-RS resource including at least one of center frequency of the CSI-RS resource; subcarrier spacing of the CSI-RS resource; periodicity and slot offset of the periodic CSI-RS resource; QCL information of the CSI-RS resource; first OFDM symbol in the slot for transmission of the CSI-RS resource; RE position of the CSI-RS resource in a PRB; sequence for CSI-RS resource sequence initialization; density of the CSI-RS resource; transmit power offset of the CSI-RS resource relative to the transmit power of the SSB in the same candidate cell; and bandwidth of the CSI-RS resource, wherein, each CSI-RS resource is assumed to be a single-port CSI-RS resource.
  • all the reference resources configured for the CSI report are in the same frequency.
  • all the reference resources configured for the CSI report have the same SCS.
  • the method further comprises transmitting a BWP switching command to switch DL RF of the UE to a BWP that covers the frequency of reference resources configured for the CSI report before receiving a first symbol of a first reference resource configured for the CSI report, wherein, the BWP has the same SCS as the SCS of the reference resources configured for the CSI report.
  • the first RF switching gap is located before a DL slot determined as the CSI reference resource associated with the CSI report, and the second RF switching gap is located after the DL slot. In some other embodiment, the first RF switching gap is located before a first symbol of a first reference resource configured for the CSI report, and the second RF switching gap is located after a last symbol of a last reference resource configured for the CSI report.
  • Figure 6 is a schematic block diagram illustrating apparatuses according to one embodiment.
  • the UE i.e. the remote unit
  • the UE includes a processor, a memory, and a transceiver.
  • the processor implements a function, a process, and/or a method which are proposed in Figure 4.
  • the UE comprises a transceiver; and a processor coupled to the transceiver, wherein the processor is configured to receive, via the transceiver, a configuration for a CSI report, wherein, at least one of reference resources for channel measurement configured for the CSI report is associated with a candidate cell configuration; and transmit, via the transceiver, the CSI report including a measurement result of one or more candidate cells.
  • the processor is further configured to report, via the transceiver, a value of RF switching gap for each frequency or band combination for LTM.
  • the processor is further configured to receive, via the transceiver, a configuration to configure a first RF switching gap and/or a second RF switching gap when the frequency of the reference resources for the CSI report is different from the frequency of any BWP of the serving cell.
  • Each of the first RF switching gap and the second RF switching gap may be configured as a number of symbols with reference to SCS of the active BWP of the serving cell configuring or triggering the CSI report or of the BWP in which the CSI report is transmitted.
  • each candidate cell configuration configures the parameters including at least one of center frequency of the SSB; subcarrier spacing of the SSB; subframe offset of candidate cell; periodicity of the SSB; SSB positions in a SSB burst; and transmit power of the SSB.
  • each candidate cell configuration may further configure one or more CSI-RS resources, or one or more CSI-RS resource set, each of which includes one or more CSI-RS resources, for LTM and configure the parameters for each CSI-RS resource including at least one of center frequency of the CSI-RS resource; subcarrier spacing of the CSI-RS resource; periodicity and slot offset of the periodic CSI-RS resource; QCL information of the CSI-RS resource; first OFDM symbol in the slot for transmission of the CSI-RS resource; RE position of the CSI-RS resource in a PRB; sequence for CSI-RS resource sequence initialization; density of the CSI-RS resource; transmit power offset of the CSI-RS resource relative to the transmit power of the SSB in the same candidate cell; and bandwidth of the CSI-RS resource, wherein, each CSI-RS resource is assumed to be a single-port CSI-RS resource.
  • all the reference resources configured for the CSI report are in the same frequency.
  • all the reference resources configured for the CSI report have the same SCS.
  • the processor when the frequency of reference resources configured for the CSI report are covered by one or more configured BWPs of at least one serving cell, is further configured to receive, via the transceiver, a BWP switching command to switch DL RF of the UE to a BWP that covers the frequency of reference resources configured for the CSI report before receiving, via the transceiver, a first symbol of a first reference resource configured for the CSI report, wherein, the BWP has the same SCS as the SCS of the reference resources configured for the CSI report.
  • the first RF switching gap is located before a DL slot determined as the CSI reference resource associated with the CSI report, and the second RF switching gap is located after the DL slot. In some other embodiment, the first RF switching gap is located before a first symbol of a first reference resource configured for the CSI report, and the second RF switching gap is located after a last symbol of a last reference resource configured for the CSI report.
  • the gNB (i.e. the base unit) includes a processor, a memory, and a transceiver.
  • the processor implements a function, a process, and/or a method which are proposed in Figure 5.
  • the base unit comprises a transceiver; and a processor coupled to the transceiver, wherein the processor is configured to transmit, via the transceiver, a configuration for a CSI report, wherein, at least one of reference resources for channel measurement configured for the CSI report is associated with a candidate cell configuration; and receive, via the transceiver, the CSI report including a measurement result of one or more candidate cells.
  • the processor is further configured to receive, via the transceiver, a value of RF switching gap for each frequency or band combination for LTM.
  • the processor is further configured to transmit, via the transceiver, a configuration to configure a first RF switching gap and/or a second RF switching gap when the frequency of the reference resources for the CSI report is different from the frequency of any BWP of the serving cell.
  • Each of the first RF switching gap and the second RF switching gap may be configured as a number of symbols with reference to SCS of the active BWP of the serving cell configuring or triggering the CSI report or of the BWP in which the CSI report is transmitted.
  • each candidate cell configuration configures the parameters including at least one of center frequency of the SSB; subcarrier spacing of the SSB; subframe offset of candidate cell; periodicity of the SSB; SSB positions in a SSB burst; and transmit power of the SSB.
  • each candidate cell configuration may further configure one or more CSI-RS resources, or one or more CSI-RS resource set, each of which includes one or more CSI-RS resources, for LTM and configure the parameters for each CSI-RS resource including at least one of center frequency of the CSI-RS resource; subcarrier spacing of the CSI-RS resource; periodicity and slot offset of the periodic CSI-RS resource; QCL information of the CSI-RS resource; first OFDM symbol in the slot for transmission of the CSI-RS resource; RE position of the CSI-RS resource in a PRB; sequence for CSI-RS resource sequence initialization; density of the CSI-RS resource; transmit power offset of the CSI-RS resource relative to the transmit power of the SSB in the same candidate cell; and bandwidth of the CSI-RS resource, wherein, each CSI-RS resource is assumed to be a single-port CSI-RS resource.
  • all the reference resources configured for the CSI report are in the same frequency.
  • all the reference resources configured for the CSI report have the same SCS.
  • the processor when the frequency of reference resources configured for the CSI report are covered by one or more configured BWPs of at least one serving cell, the processor is further configured to transmit, via the transceiver, a BWP switching command to switch DL RF of the UE to a BWP that covers the frequency of reference resources configured for the CSI report before receiving, via the transceiver, a first symbol of a first reference resource configured for the CSI report, wherein, the BWP has the same SCS as the SCS of the reference resources configured for the CSI report.
  • the first RF switching gap is located before a DL slot determined as the CSI reference resource associated with the CSI report, and the second RF switching gap is located after the DL slot. In some other embodiment, the first RF switching gap is located before a first symbol of a first reference resource configured for the CSI report, and the second RF switching gap is located after a last symbol of a last reference resource configured for the CSI report.
  • Layers of a radio interface protocol may be implemented by the processors.
  • the memories are connected with the processors to store various pieces of information for driving the processors.
  • the transceivers are connected with the processors to transmit and/or receive a radio signal. Needless to say, the transceiver may be implemented as a transmitter to transmit the radio signal and a receiver to receive the radio signal.
  • the memories may be positioned inside or outside the processors and connected with the processors by various well-known means.
  • each component or feature should be considered as an option unless otherwise expressly stated.
  • Each component or feature may be implemented not to be associated with other components or features.
  • the embodiment may be configured by associating some components and/or features. The order of the operations described in the embodiments may be changed. Some components or features of any embodiment may be included in another embodiment or replaced with the component and the feature corresponding to another embodiment. It is apparent that the claims that are not expressly cited in the claims are combined to form an embodiment or be included in a new claim.
  • the embodiments may be implemented by hardware, firmware, software, or combinations thereof.
  • the exemplary embodiment described herein may be implemented by using one or more application-specific integrated circuits (ASICs) , digital signal processors (DSPs) , digital signal processing devices (DSPDs) , programmable logic devices (PLDs) , field programmable gate arrays (FPGAs) , processors, controllers, micro-controllers, microprocessors, and the like.
  • ASICs application-specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays

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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 des procédés et des appareils de support de LTM. Dans un mode de réalisation, un UE comprend un émetteur-récepteur; et un processeur couplé à l'émetteur-récepteur, le processeur étant configuré pour recevoir, via l'émetteur-récepteur, une configuration pour un rapport de CSI, au moins l'une des ressources de référence pour une mesure de canal configurées pour le rapport de CSI étant associée à une configuration de cellule candidate; et transmettre, via l'émetteur-récepteur, le rapport de CSI comprenant un résultat de mesure d'une ou plusieurs cellules candidates.
PCT/CN2023/075883 2023-02-14 2023-02-14 Support de ltm WO2024073998A1 (fr)

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US20210212091A1 (en) * 2019-12-20 2021-07-08 Qualcomm Incorporated Signaling of multiple candidate cells for l1/l2-centric inter-cell mobility
CN114342468A (zh) * 2019-09-29 2022-04-12 华为技术有限公司 信息更新方法、设备及系统
CN114499779A (zh) * 2020-10-23 2022-05-13 上海朗帛通信技术有限公司 一种被用于无线通信的节点中的方法和装置
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US20210212091A1 (en) * 2019-12-20 2021-07-08 Qualcomm Incorporated Signaling of multiple candidate cells for l1/l2-centric inter-cell mobility
CN114499779A (zh) * 2020-10-23 2022-05-13 上海朗帛通信技术有限公司 一种被用于无线通信的节点中的方法和装置
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