WO2025211908A1 - Activation et désactivation d'une cellule candidate - Google Patents

Activation et désactivation d'une cellule candidate

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Publication number
WO2025211908A1
WO2025211908A1 PCT/KR2025/095141 KR2025095141W WO2025211908A1 WO 2025211908 A1 WO2025211908 A1 WO 2025211908A1 KR 2025095141 W KR2025095141 W KR 2025095141W WO 2025211908 A1 WO2025211908 A1 WO 2025211908A1
Authority
WO
WIPO (PCT)
Prior art keywords
cell
candidate cell
measurement result
link management
candidate
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
PCT/KR2025/095141
Other languages
English (en)
Inventor
Siyoung Choi
Sunghoon Jung
Hongsuk Kim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
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Filing date
Publication date
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Publication of WO2025211908A1 publication Critical patent/WO2025211908A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H04W36/00837—Determination of triggering parameters for hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • H04B7/06952—Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping
    • 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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link

Definitions

  • the present disclosure relates to activation and/or deactivation of a candidate cell based on joint instantaneous and filtered measurement results.
  • 3rd Generation Partnership Project (3GPP) Long-Term Evolution (LTE) is a technology for enabling high-speed packet communications. Many schemes have been proposed for the LTE objective including those that aim to reduce user and provider costs, improve service quality, and expand and improve coverage and system capacity.
  • the 3GPP LTE requires reduced cost per bit, increased service availability, flexible use of a frequency band, a simple structure, an open interface, and adequate power consumption of a terminal as an upper-level requirement.
  • 3GPP New Radio targets a single technical framework addressing all usage scenarios, requirements and deployment scenarios including enhanced Mobile BroadBand (eMBB), massive Machine Type Communications (mMTC), Ultra-Reliable and Low Latency Communications (URLLC), etc.
  • eMBB enhanced Mobile BroadBand
  • mMTC massive Machine Type Communications
  • URLLC Ultra-Reliable and Low Latency Communications
  • the NR shall be inherently forward compatible. Further, the NR should be able to use any spectrum band ranging at least up to 100 GHz that may be made available for wireless communications even in a more distant future.
  • 6G is the successor to 5G cellular technology. 6G networks will be able to use higher frequencies than 5G networks and provide substantially higher capacity and much lower latency. The 6G technology market is expected to facilitate large improvements in the areas of imaging, presence technology and location awareness. Working in conjunction with Artificial Intelligence (AI), the 6G computational infrastructure will be able to identify the best place for computing to occur. This includes decisions about data storage, processing and sharing.
  • AI Artificial Intelligence
  • Layer 3 based mobility has evolved over several releases.
  • Conditional Handover (CHO) and other conditional mobility procedures (Conditional PSCell Addition and Change (CPAC), Subsequent CPAC (SCPAC)) were developed to achieve high robustness by enabling the procedure to be executed without necessitating a signaling exchange with source cell beforehand.
  • L1/L2 Triggered Mobility (LTM) as introduced in Rel-18 offers short interruption time but not with the same level of robustness as the conditional L3 mobility procedures.
  • enhancements should be specified so that the system can benefit from both the high robustness and short interruption.
  • a method comprises receiving information related to a condition from the network, deriving a cell measurement result of a candidate cell, and determining whether to perform a beam measurement related to the candidate cell based on the condition and the cell measurement result.
  • an apparatus for implementing the above method is provided.
  • FIG. 8 shows an example of inter-gNB handover procedures to which implementations of the present disclosure are applied.
  • CDMA Code Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • TDMA Time Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier Frequency Division Multiple Access
  • MC-FDMA Multi Carrier Frequency Division Multiple Access
  • CDMA may be embodied through radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
  • the wireless devices 100a to 100f may be connected to the network 300 via the BSs 200.
  • An AI technology may be applied to the wireless devices 100a to 100f and the wireless devices 100a to 100f may be connected to the AI server 400 via the network 300.
  • the network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, a 5G (e.g., NR) network, and a beyond-5G network.
  • the wireless devices 100a to 100f may communicate with each other through the BSs 200/network 300, the wireless devices 100a to 100f may perform direct communication (e.g., sidelink communication) with each other without passing through the BSs 200/network 300.
  • the vehicles 100b-1 and 100b-2 may perform direct communication (e.g., Vehicle-to-Vehicle (V2V)/Vehicle-to-everything (V2X) communication).
  • the IoT device e.g., a sensor
  • the IoT device may perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.
  • Wireless communication/connections 150a, 150b and 150c may be established between the wireless devices 100a to 100f and/or between wireless device 100a to 100f and BS 200 and/or between BSs 200.
  • the wireless communication/connections may be established through various RATs (e.g., 5G NR) such as uplink/downlink communication 150a, sidelink communication (or Device-to-Device (D2D) communication) 150b, inter-base station communication 150c (e.g., relay, Integrated Access and Backhaul (IAB)), etc.
  • the wireless devices 100a to 100f and the BSs 200/the wireless devices 100a to 100f may transmit/receive radio signals to/from each other through the wireless communication/connections 150a, 150b and 150c.
  • the wireless communication/connections 150a, 150b and 150c may transmit/receive signals through various physical channels.
  • various configuration information configuring processes e.g., channel encoding/decoding, modulation/demodulation, and resource mapping/de-mapping
  • resource allocating processes for transmitting/receiving radio signals, may be performed based on the various proposals of the present disclosure.
  • NR supports multiples numerologies (and/or multiple Sub-Carrier Spacings (SCS)) to support various 5G services. For example, if SCS is 15 kHz, wide area can be supported in traditional cellular bands, and if SCS is 30 kHz/60 kHz, dense-urban, lower latency, and wider carrier bandwidth can be supported. If SCS is 60 kHz or higher, bandwidths greater than 24.25 GHz can be supported to overcome phase noise.
  • numerologies and/or multiple Sub-Carrier Spacings (SCS)
  • the NR frequency band may be defined as two types of frequency range, i.e., Frequency Range 1 (FR1) and Frequency Range 2 (FR2).
  • the numerical value of the frequency range may be changed.
  • the frequency ranges of the two types may be as shown in Table 1 below.
  • FR1 may mean "sub 6 GHz range”
  • FR2 may mean "above 6 GHz range”
  • mmW millimeter Wave
  • FR1 may include a frequency band of 410MHz to 7125MHz as shown in Table 2 below. That is, FR1 may include a frequency band of 6GHz (or 5850, 5900, 5925 MHz, etc.) or more. For example, a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or more included in FR1 may include an unlicensed band. Unlicensed bands may be used for a variety of purposes, for example for communication for vehicles (e.g., autonomous driving).
  • the radio communication technologies implemented in the wireless devices in the present disclosure may include NarrowBand IoT (NB-IoT) technology for low-power communication as well as LTE, NR and 6G.
  • NB-IoT technology may be an example of Low Power Wide Area Network (LPWAN) technology, may be implemented in specifications such as LTE Cat NB1 and/or LTE Cat NB2, and may not be limited to the above-mentioned names.
  • LPWAN Low Power Wide Area Network
  • the radio communication technologies implemented in the wireless devices in the present disclosure may communicate based on LTE-M technology.
  • LTE-M technology may be an example of LPWAN technology and be called by various names such as enhanced MTC (eMTC).
  • eMTC enhanced MTC
  • FIG. 2 shows an example of wireless devices to which implementations of the present disclosure are applied.
  • the first wireless device 100 and/or the second wireless device 200 may be implemented in various forms according to use cases/services.
  • ⁇ the first wireless device 100 and the second wireless device 200 ⁇ may correspond to at least one of ⁇ the wireless device 100a to 100f and the BS 200 ⁇ , ⁇ the wireless device 100a to 100f and the wireless device 100a to 100f ⁇ and/or ⁇ the BS 200 and the BS 200 ⁇ of FIG. 1.
  • the first wireless device 100 and/or the second wireless device 200 may be configured by various elements, devices/parts, and/or modules.
  • the first wireless device 100 may include at least one transceiver, such as a transceiver 106, at least one processing chip, such as a processing chip 101, and/or one or more antennas 108.
  • a transceiver such as a transceiver 106
  • a processing chip such as a processing chip 101
  • antennas 108 one or more antennas 108.
  • the processing chip 101 may include at least one processor, such a processor 102, and at least one memory, such as a memory 104. Additional and/or alternatively, the memory 104 may be placed outside of the processing chip 101.
  • the processor 102 may control the memory 104 and/or the transceiver 106 and may be adapted to implement the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts described in the present disclosure. For example, the processor 102 may process information within the memory 104 to generate first information/signals and then transmit radio signals including the first information/signals through the transceiver 106. The processor 102 may receive radio signals including second information/signals through the transceiver 106 and then store information obtained by processing the second information/signals in the memory 104.
  • the memory 104 may be operably connectable to the processor 102.
  • the memory 104 may store various types of information and/or instructions.
  • the memory 104 may store a firmware and/or a software code 105 which implements codes, commands, and/or a set of commands that, when executed by the processor 102, perform the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure.
  • the firmware and/or the software code 105 may implement instructions that, when executed by the processor 102, perform the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure.
  • the firmware and/or the software code 105 may control the processor 102 to perform one or more protocols.
  • the firmware and/or the software code 105 may control the processor 102 to perform one or more layers of the radio interface protocol.
  • the processor 102 and the memory 104 may be a part of a communication modem/circuit/chip designed to implement RAT (e.g., LTE or NR).
  • the transceiver 106 may be connected to the processor 102 and transmit and/or receive radio signals through one or more antennas 108.
  • Each of the transceiver 106 may include a transmitter and/or a receiver.
  • the transceiver 106 may be interchangeably used with Radio Frequency (RF) unit(s).
  • the first wireless device 100 may represent a communication modem/circuit/chip.
  • the second wireless device 200 may include at least one transceiver, such as a transceiver 206, at least one processing chip, such as a processing chip 201, and/or one or more antennas 208.
  • the processing chip 201 may include at least one processor, such a processor 202, and at least one memory, such as a memory 204. Additional and/or alternatively, the memory 204 may be placed outside of the processing chip 201.
  • the processor 202 may control the memory 204 and/or the transceiver 206 and may be adapted to implement the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts described in the present disclosure. For example, the processor 202 may process information within the memory 204 to generate third information/signals and then transmit radio signals including the third information/signals through the transceiver 206. The processor 202 may receive radio signals including fourth information/signals through the transceiver 106 and then store information obtained by processing the fourth information/signals in the memory 204.
  • the memory 204 may be operably connectable to the processor 202.
  • the memory 204 may store various types of information and/or instructions.
  • the memory 204 may store a firmware and/or a software code 205 which implements codes, commands, and/or a set of commands that, when executed by the processor 202, perform the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure.
  • the firmware and/or the software code 205 may implement instructions that, when executed by the processor 202, perform the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure.
  • the firmware and/or the software code 205 may control the processor 202 to perform one or more protocols.
  • the firmware and/or the software code 205 may control the processor 202 to perform one or more layers of the radio interface protocol.
  • the processor 202 and the memory 204 may be a part of a communication modem/circuit/chip designed to implement RAT (e.g., LTE or NR).
  • the transceiver 206 may be connected to the processor 202 and transmit and/or receive radio signals through one or more antennas 208.
  • Each of the transceiver 206 may include a transmitter and/or a receiver.
  • the transceiver 206 may be interchangeably used with RF unit.
  • the second wireless device 200 may represent a communication modem/circuit/chip.
  • One or more protocol layers may be implemented by, without being limited to, one or more processors 102 and 202.
  • the one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as Physical (PHY) layer, Media Access Control (MAC) layer, Radio Link Control (RLC) layer, Packet Data Convergence Protocol (PDCP) layer, Radio Resource Control (RRC) layer, and Service Data Adaptation Protocol (SDAP) layer).
  • layers e.g., functional layers such as Physical (PHY) layer, Media Access Control (MAC) layer, Radio Link Control (RLC) layer, Packet Data Convergence Protocol (PDCP) layer, Radio Resource Control (RRC) layer, and Service Data Adaptation Protocol (SDAP) layer).
  • PHY Physical
  • MAC Media Access Control
  • RLC Radio Link Control
  • PDCP Packet Data Convergence Protocol
  • RRC Radio Resource Control
  • SDAP Service Data Adaptation Protocol
  • the one or more processors 102 and 202 may receive the signals (e.g., baseband signals) from the one or more transceivers 106 and 206 and acquire the PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure.
  • signals e.g., baseband signals
  • the one or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers.
  • the one or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof.
  • ASICs Application Specific Integrated Circuits
  • DSPs Digital Signal Processors
  • DSPDs Digital Signal Processing Devices
  • PLDs Programmable Logic Devices
  • FPGAs Field Programmable Gate Arrays
  • the one or more processors 102 and 202 may be configured by a set of a communication control processor, an Application Processor (AP), an Electronic Control Unit (ECU), a Central Processing Unit (CPU), a Graphic Processing Unit (GPU), and a memory control processor.
  • AP Application Processor
  • ECU Electronic Control Unit
  • CPU Central Processing Unit
  • GPU Graphic Processing Unit
  • memory control processor a memory control processor
  • the one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, code, instructions, and/or commands.
  • the one or more memories 104 and 204 may be configured by Random Access Memory (RAM), Dynamic RAM (DRAM), Read-Only Memory (ROM), electrically Erasable Programmable Read-Only Memory (EPROM), flash memory, volatile memory, non-volatile memory, hard drive, register, cash memory, computer-readable storage medium, and/or combinations thereof.
  • the one or more memories 104 and 204 may be located at the interior and/or exterior of the one or more processors 102 and 202.
  • the one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 through various technologies such as wired or wireless connection.
  • the one or more transceivers 106 and 206 may transmit user data, control information, and/or radio signals/channels, mentioned in the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure, to one or more other devices.
  • the one or more transceivers 106 and 206 may receive user data, control information, and/or radio signals/channels, mentioned in the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure, from one or more other devices.
  • the one or more transceivers 106 and 206 may be connected to the one or more processors 102 and 202 and transmit and receive radio signals.
  • the one or more processors 102 and 202 may perform control so that the one or more transceivers 106 and 206 may transmit user data, control information, or radio signals to one or more other devices.
  • the one or more processors 102 and 202 may perform control so that the one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices.
  • the one or more transceivers 106 and 206 may be connected to the one or more antennas 108 and 208. Additionally and/or alternatively, the one or more transceivers 106 and 206 may include one or more antennas 108 and 208. The one or more transceivers 106 and 206 may be adapted to transmit and receive user data, control information, and/or radio signals/channels, mentioned in the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure, through the one or more antennas 108 and 208. In the present disclosure, the one or more antennas 108 and 208 may be a plurality of physical antennas or a plurality of logical antennas (e.g., antenna ports).
  • the one or more transceivers 106 and 206 may convert received user data, control information, radio signals/channels, etc., from RF band signals into baseband signals in order to process received user data, control information, radio signals/channels, etc., using the one or more processors 102 and 202.
  • the one or more transceivers 106 and 206 may convert the user data, control information, radio signals/channels, etc., processed using the one or more processors 102 and 202 from the base band signals into the RF band signals.
  • the one or more transceivers 106 and 206 may include (analog) oscillators and/or filters.
  • FIGS. 4 and 5 show an example of protocol stacks in a 3GPP based wireless communication system to which implementations of the present disclosure are applied.
  • the main services and functions of the PDCP sublayer for the control plane include: sequence numbering; ciphering, deciphering and integrity protection; transfer of control plane data; reordering and duplicate detection; in-order delivery; duplication of PDCP PDUs and duplicate discard indication to lower layers.
  • the main services and functions of SDAP include: mapping between a QoS flow and a data radio bearer; marking QoS Flow ID (QFI) in both DL and UL packets.
  • QFI QoS Flow ID
  • a single protocol entity of SDAP is configured for each individual PDU session.
  • a slot includes plural symbols (e.g., 14 or 12 symbols) in the time domain.
  • a resource grid of N size,u grid,x * N RB sc subcarriers and N subframe,u symb OFDM symbols is defined, starting at Common Resource Block (CRB) N start,u grid indicated by higher-layer signaling (e.g., RRC signaling), where N size,u grid,x is the number of Resource Blocks (RBs) in the resource grid and the subscript x is DL for downlink and UL for uplink.
  • N RB sc is the number of subcarriers per RB. In the 3GPP based wireless communication system, N RB sc is 12 generally.
  • Each element in the resource grid for the antenna port p and the subcarrier spacing configuration u is referred to as a Resource Element (RE) and one complex symbol may be mapped to each RE.
  • Each RE in the resource grid is uniquely identified by an index k in the frequency domain and an index l representing a symbol location relative to a reference point in the time domain.
  • an RB is defined by 12 consecutive subcarriers in the frequency domain.
  • RBs are classified into CRBs and Physical Resource Blocks (PRBs).
  • CRBs are numbered from 0 and upwards in the frequency domain for subcarrier spacing configuration u .
  • the center of subcarrier 0 of CRB 0 for subcarrier spacing configuration u coincides with 'point A' which serves as a common reference point for resource block grids.
  • PRBs are defined within a BandWidth Part (BWP) and numbered from 0 to N size BWP,i -1, where i is the number of the bandwidth part.
  • BWP BandWidth Part
  • n PRB n CRB + N size BWP,i , where N size BWP,i is the common resource block where bandwidth part starts relative to CRB 0.
  • the BWP includes a plurality of consecutive RBs.
  • a carrier may include a maximum of N (e.g., 5) BWPs.
  • a UE may be configured with one or more BWPs on a given component carrier. Only one BWP among BWPs configured to the UE can active at a time. The active BWP defines the UE's operating bandwidth within the cell's operating bandwidth.
  • the term "cell” may refer to a geographic area to which one or more nodes provide a communication system, or refer to radio resources.
  • a “cell” as a geographic area may be understood as coverage within which a node can provide service using a carrier and a "cell” as radio resources (e.g., time-frequency resources) is associated with bandwidth which is a frequency range configured by the carrier.
  • the "cell” associated with the radio resources is defined by a combination of downlink resources and uplink resources, for example, a combination of a DL Component Carrier (CC) and a UL CC.
  • the cell may be configured by downlink resources only, or may be configured by downlink resources and uplink resources.
  • the coverage of the node may be associated with coverage of the "cell" of radio resources used by the node. Accordingly, the term "cell" may be used to represent service coverage of the node sometimes, radio resources at other times, or a range that signals using the radio resources can reach with valid strength at other times.
  • CA In CA, two or more CCs are aggregated. A UE may simultaneously receive or transmit on one or multiple CCs depending on its capabilities.
  • CA is supported for both contiguous and non-contiguous CCs.
  • the UE When CA is configured, the UE only has one RRC connection with the network.
  • RRC connection establishment/re-establishment/handover one serving cell provides the NAS mobility information, and at RRC connection re-establishment/handover, one serving cell provides the security input.
  • This cell is referred to as the Primary Cell (PCell).
  • the PCell is a cell, operating on the primary frequency, in which the UE either performs the initial connection establishment procedure or initiates the connection re-establishment procedure.
  • SCells can be configured to form together with the PCell a set of serving cells.
  • An SCell is a cell providing additional radio resources on top of Special Cell (SpCell).
  • the configured set of serving cells for a UE therefore always consists of one PCell and one or more SCells.
  • SpCell refers to the PCell of the Master Cell Group (MCG) or the Primary SCell (PSCell) of the Secondary Cell Group (SCG).
  • MCG Master Cell Group
  • PSCell Primary SCell
  • SCG Secondary Cell Group
  • An SpCell supports Physical Uplink Control Channel (PUCCH) transmission and contention-based random access, and is always activated.
  • PUCCH Physical Uplink Control Channel
  • the MCG is a group of serving cells associated with a master node, comprised of the SpCell (PCell) and optionally one or more SCells.
  • the SCG is the subset of serving cells associated with a secondary node, comprised of the PSCell and zero or more SCells, for a UE configured with DC.
  • a UE in RRC_CONNECTED not configured with CA/DC there is only one serving cell comprised of the PCell.
  • serving cells is used to denote the set of cells comprised of the SpCell(s) and all SCells.
  • two MAC entities are configured in a UE: one for the MCG and one for the SCG.
  • FIG. 7 shows a data flow example in the 3GPP NR system to which implementations of the present disclosure are applied.
  • Radio bearers are categorized into two groups: DRBs for user plane data and SRBs for control plane data.
  • the MAC PDU is transmitted/received using radio resources through the PHY layer to/from an external device.
  • the MAC PDU arrives to the PHY layer in the form of a transport block.
  • the uplink transport channels UL-SCH and Random Access Channel are mapped to their physical channels Physical Uplink Shared Channel (PUSCH) and Physical Random Access Channel (PRACH), respectively, and the downlink transport channels DL-SCH, BCH and PCH are mapped to Physical Downlink Shared Channel (PDSCH), Physical Broadcast Channel (PBCH) and PDSCH, respectively.
  • PUSCH Physical Uplink Shared Channel
  • PRACH Physical Random Access Channel
  • PDSCH Physical Downlink Shared Channel
  • PBCH Physical Broadcast Channel
  • PDSCH Physical Downlink Control Channel
  • UCI Uplink Control Information
  • DCI Downlink Control Information
  • a MAC PDU related to UL-SCH is transmitted by a UE via a PUSCH based on an UL grant, and a MAC PDU related to DL-SCH is transmitted by a BS via a PDSCH based on a DL assignment.
  • Network controlled mobility applies to UEs in RRC_CONNECTED and is categorized into two types of mobility: cell level mobility and beam level mobility.
  • Beam level mobility includes intra-cell beam level mobility and inter-cell beam level mobility.
  • FIG. 8 shows an example of inter-gNB handover procedures to which implementations of the present disclosure are applied.
  • the signaling procedures consist of at least the following elemental components described in FIG. 8.
  • Step 1 The source gNB initiates handover and issues a HANDOVER REQUEST over the Xn interface.
  • Step 2 The target gNB performs admission control and provides the new RRC configuration as part of the HANDOVER REQUEST ACKNOWLEDGE.
  • Step 4 The UE moves the RRC connection to the target gNB and replies with the RRCReconfigurationComplete .
  • User data may also be sent in step 4 if the grant allows.
  • Beam level mobility does not require explicit RRC signaling to be triggered. Beam level mobility can be within a cell, or between cells, the latter is referred to as Inter-Cell Beam Management (ICBM).
  • ICBM Inter-Cell Beam Management
  • a UE can receive or transmit UE dedicated channels/signals via a Transmission/Reception Point (TRP) associated with a Physical Cell ID (PCI) different from the PCI of a serving cell, while non-UE-dedicated channels/signals can only be received via a TRP associated with a PCI of the serving cell.
  • TRP Transmission/Reception Point
  • PCI Physical Cell ID
  • the gNB provides via RRC signaling the UE with measurement configuration containing configurations of Synchronization Signal Block (SSB)/Channel State Information (CSI) resources and resource sets, reports and trigger states for triggering channel and interference measurements and reports.
  • SSB Synchronization Signal Block
  • CSI Channel State Information
  • a measurement configuration includes SSB resources associated with PCIs different from the PCI of a serving cell. Beam level mobility is then dealt with at lower layers by means of physical layer and MAC layer control signaling, and RRC is not required to know which beam is being used at a given point in time.
  • SSB-based beam level mobility is based on the SSB associated to the initial DL BWP and can only be configured for the initial DL BWPs and for DL BWPs containing the SSB associated to the initial DL BWP.
  • beam level mobility can only be performed based on CSI-Reference Signal (RS).
  • RS CSI-Reference Signal
  • a Conditional Handover is defined as a handover that is executed by the UE when one or more handover execution conditions are met.
  • the UE starts evaluating the execution condition(s) upon receiving the CHO configuration, and stops evaluating the execution condition(s) once a handover is executed.
  • the CHO configuration contains the configuration of CHO candidate cell(s) generated by the candidate gNB(s) and execution condition(s) generated by the source gNB.
  • An execution condition may consist of one or two trigger condition(s) (CHO events A3/). Only single RS type is supported and at most two different trigger quantities (e.g., Reference Signal Received Power (RSRP) and Reference Signal Received Quality (RSRQ), RSRP and Signal-to-Interference plus Noise Ratio (SINR), etc.) can be configured simultaneously for the evaluation of CHO execution condition of a single candidate cell.
  • RSRP Reference Signal Received Power
  • RSRQ Reference Signal Received Quality
  • SINR Signal-to-Interference plus Noise Ratio
  • the UE executes the HO procedure, regardless of any previously received CHO configuration.
  • the UE While executing CHO, i.e., from the time when the UE starts synchronization with target cell, the UE does not monitor source cell.
  • the UE does not update its security key after an intra-gNB LTM cell switch.
  • MAC Control Element (CE) which contains the necessary information to perform the LTM cell switch.
  • Subsequent LTM is done by repeating the early synchronization, LTM cell switch execution, and LTM cell switch completion steps without releasing other LTM candidate cell configurations after each LTM cell switch completion.
  • the signaling procedure for LTM is as follows.
  • Step 1 The UE sends a MeasurementReport message to the gNB.
  • the gNB decides to configure LTM and initiates candidate cell(s) preparation.
  • Step 2 The gNB transmits an RRCReconfiguration message to the UE including the LTM candidate cell configurations of one or multiple candidate cells.
  • Step 3 The UE stores the LTM candidate cell configurations and transmits an RRCReconfigurationComplete message to the gNB.
  • Step 4a The UE may perform DL synchronization with the candidate cell(s) before receiving the cell switch command.
  • Step 4b When UE-based TA measurement is configured, the UE may acquire the TA value(s) of the candidate cell(s) by measurement. Otherwise, the UE may perform early TA acquisition with the candidate cell(s) as requested by the network before receiving the cell switch command. This may be done via Contention-Free Random Access (CFRA) triggered by a PDCCH order from the source cell, following which the UE may send preamble towards the indicated candidate cell.
  • CFRA Contention-Free Random Access
  • the UE may not receive random access response from the network for the purpose of TA value acquisition and the TA value of the candidate cell is indicated in the cell switch command. The UE may not maintain the TA timer for the candidate cell and relies on network implementation to guarantee the TA validity.
  • CFRA Contention-Free Random Access
  • Step 5 The UE performs L1 measurements on the configured candidate cell(s) and transmits L1 measurement reports to the gNB. L1 measurement should be performed as long as RRC reconfiguration (step 2) is applicable.
  • Step 6 The gNB decides to execute cell switch to a target cell and transmits a MAC CE triggering cell switch by including the candidate configuration index of the target cell.
  • the UE switches to the target cell and applies the configuration indicated by candidate configuration index.
  • Step 7 The UE may perform the random access procedure towards the target cell, if the UE does not have valid TA of the target cell.
  • the UE may perform CFRA if the LTM cell switch command MAC CE contains information for CFRA.
  • Step 8 The UE completes the LTM cell switch procedure by sending RRCReconfigurationComplete message to target cell. If the UE has performed a random access procedure in step 7, the UE considers that LTM cell switch execution is successfully completed when the random access procedure is successfully completed. For RACH-less LTM, the UE considers that LTM cell switch execution is successfully completed when the UE determines that the network has successfully received its first UL data. The UE determines successful reception of its first UL data by receiving a PDCCH addressing the UE's Cell Radio Network Temporary Identity (C-RNTI) in the target cell, which schedules a new transmission following the first UL data. The PDCCH carries either a DL assignment or an UL grant addressing the same HARQ process as the first UL data.
  • C-RNTI Cell Radio Network Temporary Identity
  • the steps 4-8 can be performed multiple times for subsequent LTM using the LTM candidate cell configuration(s) provided in step 2.
  • the UE may perform link management (e.g., L1 measurement, L1 measurement reporting, or early UL/DL synchronization) to one or more LTM candidate cells based on LTM configuration provided by the network. If the number of LTM candidate cells configured for a specific UE is too large, UE complexity/overhead may increase due to link management of LTM candidate cells.
  • link management e.g., L1 measurement, L1 measurement reporting, or early UL/DL synchronization
  • LTM based on CSI-RS-based L1 measurement may provide higher-performance inter-cell mobility than LTM based on SSB-based L1 measurement by performing early synchronization and/or activation of fine-beams of the LTM candidate cell.
  • CSI-RS-based L1 measurement may require a larger number of reference signals than conventional SSB-based L1 measurement. Consequently, CSI-RS based L1 measurements may worsen UE complexity/overhead due to link management of LTM candidate cells.
  • LTM candidate cells activation/deactivation of one or more LTM candidate cells may be considered.
  • UE-based LTM trigger e.g., execution condition-based mobility like CHO
  • LTM triggered by the UE based on, e.g., execution condition may called Conditional LTM (CLTM).
  • CLTM Conditional LTM
  • UE-based activation/deactivation of one or more LTM candidate cells may be necessary.
  • the L3 measurement configuration (i.e., measurement object) may be provided separately from the L1 measurement configuration for LTM.
  • the average value taken from the L1 measurement in the time domain e.g., exponential weighted moving average
  • the L3 measurement result may be a filtered measurement result based on the L1 measurement results (e.g., instantaneous measurement results), where filtering may be performed in time domain, spatial domain, etc.
  • the filtered measurement result based on instantaneous measurement results may not reflect rapid change of channel quality in an environment where channel quality changes dynamically (e.g., FR2 environment). Since LTM (and/or CLTM) is a mobility dependent on instantaneous measurement result (e.g., L1 measurement result), LTM candidate cell management (e.g., activation/deactivation of LTM candidate cell) based on filtered measurement result (e.g., L3 measurement result) may reduce LTM cell switch opportunities, resulting in degradation of UE QoS/Quality of Experience (QoE).
  • QoE Quality of Experience
  • FIG. 10 shows an example of a problem of activation/deactivation of a candidate cell based on L3 measurement to which implementations of the present disclosure are applied.
  • the UE operation over time is as follows.
  • a candidate cell deactivation is performed. That is, link management of the candidate cell is deactivated.
  • a candidate cell activation is performed based on the filtered L3 measurement. That is, link management of the candidate cell is activated.
  • LTM cell switch could be performed with the candidate cell based on the L1 measurement, but the LTM cell switch opportunity was missed due to candidate cell deactivation based on the L3 measurement. If the candidate cell was activated at time point t1 or t2, LTM cell switch could be performed earlier than time point t3.
  • candidate cell activation based on L3 measurement may cause late candidate cell activation, which can result in missed LTM cell switch opportunity or late LTM cell switch. Therefore, it may be necessary to consider instantaneous channel quality (e.g., L1 measurement) for candidate cell activation.
  • instantaneous channel quality e.g., L1 measurement
  • candidate cell deactivation based on L3 measurement may also cause late candidate cell deactivation, but the problem may be minimal compared to the candidate cell activation based on L3 measurement.
  • candidate cell deactivation based on L1 measurement may cause increase UE complexity due to frequent deactivation/activation.
  • an evaluation condition may be needed for which candidate cell deactivation is performed conservatively and candidate cell activation is performed aggressively.
  • the UE may receive one or more candidate cell configurations for mobility.
  • Each candidate cell configuration may include a link management configuration for each candidate cell.
  • the UE may receive information related to a condition for activation and/or deactivation of link management for each candidate cell.
  • the information related to the condition may be included in each candidate cell configuration and/or each link management configuration.
  • instantaneous measurement result e.g., L1 measurement result
  • filtered measurement result e.g., L3 measurement result
  • the UE may stop performing link management of the candidate cell. If the activation condition for a deactivated candidate cell is met, the UE may start performing ink management of the candidate cell.
  • the deactivation condition in order to increase LTM cell switch opportunities, may be based on filtered measurement results, but the activation condition may be based on joint measurement result of instantaneous and filtered measurement results.
  • the deactivation of the LTM candidate cell may be performed based on a condition related to L3 measurement result.
  • the condition for deactivating a candidate cell may be that L3 measurement result is smaller than threshold 1.
  • the activation of the LTM candidate cell may be performed based on a condition related to joint of L1 measurement result and L3 measurement result.
  • the condition for activating a candidate cell may be that L1 measurement is larger than a threshold 2 or L3 measurement result is larger than threshold.
  • the condition for activating a candidate cell may be that L1 measurement result is larger than threshold 2 and difference from between L1 measurement result and L3 measurement result is larger than threshold 3.
  • L1 measurement may have the same meaning as instantaneous measurement (result) and/or beam measurement (result).
  • L3 measurement may have the same meaning as filtered measurement (result) and/or cell measurement (result).
  • link management may refer to evaluating and/or measuring some resources/reference signals/measurement targets for performing LTM to one or more LTM candidate cells.
  • link management may include at least one of L1 measurement, L1 measurement reporting, or early UL/DL synchronization.
  • a Cell Group may be classified as regular CG and candidate CG.
  • Regular SCG may be activated or deactivated based on network command or UE based condition.
  • Candidate CG may be activated as regular CG if applicable condition is met.
  • Regular CG may become candidate CG if applicable condition is met. For example, if there is a constraint that only one regular SCG can be activated, if a candidate SCG candidate becomes a new regular SCG, the previous regular SCG may become a candidate SCG.
  • FIG. 11 shows an example of a method to which implementations of the present disclosure are applied.
  • step S1100 the method comprises receiving a configuration for a candidate cell for mobility from a network.
  • the configuration may include a link management configuration.
  • the wireless device may be configured with a list of link management configuration for one or more candidate cells.
  • the link management configuration may be associated with at least one or more cell groups.
  • a certain link management configuration may be associated with a specific CG, e.g., MCG or SCG.
  • a certain link management configuration may be associated with a candidate CG.
  • each link management configuration may comprise link management resource information and/or link management parameters.
  • the link management configuration may comprise resource information related to a radio link monitoring (RLM) and/or parameters for the RLM. That is, the link management configuration may be for RLM configuration.
  • the RLM configuration may comprise RLM resources (e.g., RS information) and/or RLM parameters (e.g., counter, timer).
  • the link management configuration may comprise resource information related to a beam failure detection (BFD) and/or parameters for the BFD. That is, the link management configuration may be for BFD configuration.
  • the BFD configuration may comprise BFD resources (e.g., RS information) and/or BFD parameters (e.g., counter, timer).
  • the link management configuration may comprise parameters related to UL timing management operation.
  • the link management configuration may include uplink signaling such as RACH resources, uplink reference signaling such as Sounding RS (SRS), and UE based Timing Advance (TA) measurement, etc.
  • uplink signaling such as RACH resources
  • uplink reference signaling such as Sounding RS (SRS)
  • TA Timing Advance
  • the link management configuration may comprise parameters related to DL synchronization.
  • the link management configuration may include beam information (e.g., SSB, Transmission Configuration Index (TCI) state configuration).
  • beam information e.g., SSB, Transmission Configuration Index (TCI) state configuration.
  • the link management configuration may comprise common resource information and/or common parameters applicable for both an activated candidate cell group and a deactivated candidate cell group, and the link management configuration may be configured separately for the activated candidate cell group and the deactivated candidate cell group, respectively.
  • the link management configuration may comprise separate link management resource information and/or link management parameters for activated candidate CG and deactivated candidate CG, respectively.
  • the link management configuration may comprise common link management resource information and link management parameters applicable for both activated candidate CG and deactivated candidate CG.
  • the wireless device may be configured with activation condition and/or deactivation condition for one or more candidate cells.
  • the deactivation condition for link management of an activated candidate cell may include at least one of the followings.
  • filtered measurement result is smaller than threshold_3 and instantaneous measurement result is smaller than threshold_4, or filtered measurement result is smaller than threshold_3 or instantaneous measurement result is smaller than threshold_4
  • the activation condition for link management of a deactivated candidate cell may include at least one of the followings.
  • filtered measurement result is larger than threshold_7 and instantaneous measurement result is larger than threshold_8, or e.g. filtered measurement result is larger than threshold_7 or instantaneous measurement result is larger than threshold_8
  • the deactivation condition in order to increase LTM cell switch opportunities, may be based on filtered measurement results, whereas the activation condition may be based on joint measurement result of instantaneous and filtered measurement results.
  • the instantaneous measurement result may refer to at least one of the followings.
  • the filtered measurement result may refer to at least one of the followings.
  • Spatial average of instantaneous measurement results e.g. average value of instantaneous measurement results corresponding to all SSB related beams associated with the candidate cell, or average value of instantaneous measurement results corresponding to all CSI-RS related beams associated with the candidate cell, or average value of instantaneous measurement results corresponding to top-k beams
  • Temporal average of instantaneous measurement results e.g., average value of instantaneous measurement results over a time window, or Exponentially Weighted Moving Average (EWMA) of instantaneous measurement results over a time window
  • EWMA Exponentially Weighted Moving Average
  • step S1120 the method comprises deriving a cell measurement result of the candidate cell.
  • the network may configure the wireless device in RRC_CONNECTED to derive RSRP, RSRQ and SINR measurement results per cell associated to NR measurement objects based on parameters configured in the measObject (e.g. maximum number of beams to be averaged and beam consolidation thresholds) and in the reportConfig ( rsType to be measured, SS/PBCH block or CSI-RS).
  • parameters configured in the measObject e.g. maximum number of beams to be averaged and beam consolidation thresholds
  • the reportConfig rsType to be measured, SS/PBCH block or CSI-RS.
  • the network may configure the wireless device in RRC_IDLE or in RRC_INACTIVE to derive RSRP and RSRQ measurement results per cell associated to NR carriers based on parameters configured in measIdleCarrierListNR within VarMeasIdleConfig .
  • the UE may:
  • each cell measurement quantity based on SS/PBCH block as the linear power scale average of the highest beam measurement quantity values above absThreshSS-BlocksConsolidation where the total number of averaged beams shall not exceed nrofSS-BlocksToAverage ;
  • a CSI-RS resource to be applicable for deriving cell measurements when the concerned CSI-RS resource is included in the csi-rs-CellMobility including the physCellId of the cell in the CSI-RSResourceConfigMobility in the associated measObject ;
  • each cell measurement quantity based on CSI-RS as the linear power scale average of the highest beam measurement quantity values above absThreshCSI-RS-Consolidation where the total number of averaged beams shall not exceed nrofCSI-RS-ResourcesToAverage ;
  • the UE may:
  • step S1130 the method comprises determining whether to perform a beam measurement related to the candidate cell based on the condition and the cell measurement result.
  • the method may be determined not to perform the beam measurement related to the candidate cell based on the cell measurement result satisfying the condition.
  • the cell measurement result satisfying the condition may comprise the cell measurement result being smaller than a first threshold.
  • the method may further comprise informing the network that the beam measurement related to the candidate cell is determined not to be performed.
  • the method may further comprise stopping and/or pausing an operation related to the beam management of the candidate cell based on determining not to perform the beam measurement related to the candidate cell.
  • the wireless device may stop measuring UE based TA of the candidate cell upon deactivation.
  • the wireless device may delete the UE based TA measurement of the candidate cell upon deactivation.
  • the wireless device may start measuring UE based TA of the candidate cell upon deactivation.
  • the method may be performed by a wireless device.
  • the wireless device may be in communication with at least one of a mobile device, a network, and/or autonomous vehicles other than the wireless device.
  • the wireless device may be implemented by the first wireless device 100 shown in FIG. 2 and/or the UE 100 shown in FIG. 3.
  • the wireless device comprises at least one transceiver, at least one processor, and at least one memory operably connectable to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform the method described in FIG. 11.
  • the wireless device receives a configuration for a candidate cell for mobility from a network.
  • the configuration may include a link management configuration.
  • the wireless device may be configured with a list of link management configuration for one or more candidate cells.
  • the link management configuration may be associated with at least one or more cell groups.
  • a certain link management configuration may be associated with a specific CG, e.g., MCG or SCG.
  • a certain link management configuration may be associated with a candidate CG.
  • each link management configuration may comprise link management resource information and/or link management parameters.
  • the link management configuration may comprise resource information related to a radio link monitoring and/or parameters for the RLM. That is, the link management configuration may be for RLM configuration.
  • the RLM configuration may comprise RLM resources (e.g., RS information) and/or RLM parameters (e.g., counter, timer).
  • the link management configuration may comprise resource information related to a beam failure detection and/or parameters for the BFD. That is, the link management configuration may be for BFD configuration.
  • the BFD configuration may comprise BFD resources (e.g., RS information) and/or BFD parameters (e.g., counter, timer).
  • the link management configuration may comprise parameters related to UL timing management operation.
  • the link management configuration may include uplink signaling such as RACH resources, uplink reference signaling such as SRS, and UE based TA measurement, etc.
  • the link management configuration may comprise parameters related to DL synchronization.
  • the link management configuration may include beam information (e.g., SSB, TCI state configuration).
  • the link management configuration may comprise common resource information and/or common parameters applicable for both a regular cell group and a candidate cell group, and the link management configuration may be configured separately for the regular cell group and the candidate cell group, respectively.
  • the link management configuration may comprise separate link management resource information and/or link management parameters for regular CG and candidate CG, respectively.
  • the link management configuration may comprise common link management resource information and/or link management parameters applicable for both regular CG and candidate CG.
  • the link management configuration may comprise common resource information and/or common parameters applicable for both an activated candidate cell group and a deactivated candidate cell group, and the link management configuration may be configured separately for the activated candidate cell group and the deactivated candidate cell group, respectively.
  • the link management configuration may comprise separate link management resource information and/or link management parameters for activated candidate CG and deactivated candidate CG, respectively.
  • the link management configuration may comprise common link management resource information and link management parameters applicable for both activated candidate CG and deactivated candidate CG.
  • the configuration may include information related to an initial state of link management (e.g., activated or deactivated)
  • the wireless device receives information related to a condition from the network.
  • the wireless device may be configured with activation condition and/or deactivation condition for one or more candidate cells.
  • the deactivation condition for link management of an activated candidate cell may include at least one of the followings.
  • filtered measurement result is smaller than threshold_3 and instantaneous measurement result is smaller than threshold_4, or filtered measurement result is smaller than threshold_3 or instantaneous measurement result is smaller than threshold_4
  • the activation condition for link management of a deactivated candidate cell may include at least one of the followings.
  • the deactivation condition in order to increase LTM cell switch opportunities, may be based on filtered measurement results, whereas the activation condition may be based on joint measurement result of instantaneous and filtered measurement results.
  • the instantaneous measurement result may refer to at least one of the followings.
  • the wireless device may deactivate link management operation of the candidate cell if the deactivation condition for the candidate cell is met.
  • the wireless device may indicate deactivation of link management of a candidate cell to the network.
  • the wireless device may stop/pause operations related to the link management of the candidate cell upon deactivation. Deactivation of candidate cell may include at least one of the following operations.
  • the cell measurement result and the beam measurement result satisfying the condition may comprise the cell measurement result being larger than a second threshold and/or the beam measurement result being larger than a third threshold.
  • the method may further comprise informing the network that the beam measurement related to the candidate cell is determined to be performed to the network.
  • the method may further comprise starting an operation related to the beam management of the candidate cell based on determining to perform the beam measurement related to the candidate cell.
  • the processing apparatus adapted to control the wireless device comprises at least one processor, and at least one memory operably connectable to the at least one processor.
  • the at least one processor is adapted to perform the method described in FIG. 11.
  • the method described above in FIG. 11 may be performed by a software code 105 stored in the memory 104 included in the first wireless device 100 shown in FIG. 2.
  • a method performed by a wireless device in a wireless communication may be implemented in hardware, software, firmware, or any combination thereof.
  • a software may reside in RAM, flash memory, ROM, EPROM, EEPROM, registers, hard disk, a removable disk, a CD-ROM, or any other storage medium.
  • storage medium may be coupled to the processor such that the processor can read information from the storage medium.
  • the storage medium may be integral to the processor.
  • the processor and the storage medium may reside in an ASIC.
  • the processor and the storage medium may reside as discrete components.
  • the computer-readable medium may include a tangible and non-transitory computer-readable storage medium.
  • non-transitory computer-readable media may include RAM such as Synchronous DRAM (SDRAM), ROM, Non-Volatile RAM (NVRAM), EEPROM, flash memory, magnetic or optical data storage media, or any other medium that can be used to store instructions or data structures.
  • RAM such as Synchronous DRAM (SDRAM), ROM, Non-Volatile RAM (NVRAM), EEPROM, flash memory, magnetic or optical data storage media, or any other medium that can be used to store instructions or data structures.
  • RAM such as Synchronous DRAM (SDRAM), ROM, Non-Volatile RAM (NVRAM), EEPROM, flash memory, magnetic or optical data storage media, or any other medium that can be used to store instructions or data structures.
  • Non-transitory computer-readable media may also include combinations of the above.
  • the method described herein may be realized at least in part by a computer-readable communication medium that carries or communicates code in the form of instructions or data structures and that can be accessed, read, and/or executed by a computer.
  • a non-transitory Computer-Readable Medium stores instructions that, based on being executed by at least one processor, perform the method described in FIG. 11.
  • FIG. 12 shows an example of another method to which implementations of the present disclosure are applied.
  • step S1200 the method comprises transmitting a configuration for a candidate cell for mobility to a wireless device.
  • step S1210 the method comprises transmitting information related to a condition to the wireless device.
  • a cell measurement result of the candidate cell is derived, and whether to perform a beam measurement related to the candidate cell is determined based on the condition and the cell measurement result.
  • the method described above in FIG. 12 may be performed by a base station.
  • the base station may be implemented by the second wireless device 200 shown in FIG. 2.
  • the base station comprises at least one transceiver, at least one processor, and at least one memory operably connectable to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform the method described in FIG. 12.
  • the base station transmits a configuration for a candidate cell for mobility to a wireless device.
  • the base station transmits information related to a condition to the wireless device.
  • a cell measurement result of the candidate cell is derived, and whether to perform a beam measurement related to the candidate cell is determined based on the condition and the cell measurement result.
  • the present disclosure may have various advantageous effects.
  • UE complexity/overhead can be reduced by not performing link management (e.g., L1 measurement, L1 measurement reporting, early UL/DL synchronization, etc.) for some candidate cells through candidate cell deactivation.
  • link management e.g., L1 measurement, L1 measurement reporting, early UL/DL synchronization, etc.
  • LTM cell switch can be performed in a timely manner.
  • QoE/QoS for the UE can increase.

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Abstract

L'invention concerne un procédé et un appareil d'activation et/ou de désactivation d'une cellule candidate sur la base de résultats de mesure instantanés et filtrés conjointes. Un dispositif sans fil reçoit des informations relatives à une condition provenant du réseau, déduit un résultat de mesure de cellule d'une cellule candidate, et détermine s'il faut effectuer une mesure de faisceau associée à la cellule candidate sur la base de la condition et du résultat de mesure de cellule.
PCT/KR2025/095141 2024-04-02 2025-03-31 Activation et désactivation d'une cellule candidate Pending WO2025211908A1 (fr)

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WO2018232090A1 (fr) * 2017-06-14 2018-12-20 Idac Holdings, Inc. Gestion de faisceau unifié dans un réseau sans fil
US20210159967A1 (en) * 2018-08-07 2021-05-27 Ofinno, Llc Cell Grouping in Beam Failure Recovery Procedure
US20210345201A1 (en) * 2018-09-29 2021-11-04 Qualcomm Incorporated Beam measurement for a cell subset
EP3536012B1 (fr) * 2016-11-04 2023-12-20 Nokia Technologies Oy Mesures efficaces de faisceaux
CN117460094A (zh) * 2022-07-07 2024-01-26 夏普株式会社 由用户设备执行同步重配置的方法及用户设备

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EP3536012B1 (fr) * 2016-11-04 2023-12-20 Nokia Technologies Oy Mesures efficaces de faisceaux
WO2018232090A1 (fr) * 2017-06-14 2018-12-20 Idac Holdings, Inc. Gestion de faisceau unifié dans un réseau sans fil
US20210159967A1 (en) * 2018-08-07 2021-05-27 Ofinno, Llc Cell Grouping in Beam Failure Recovery Procedure
US20210345201A1 (en) * 2018-09-29 2021-11-04 Qualcomm Incorporated Beam measurement for a cell subset
CN117460094A (zh) * 2022-07-07 2024-01-26 夏普株式会社 由用户设备执行同步重配置的方法及用户设备

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