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WO2024092598A1 - Filtrage de mesures de couche 1 d'une cellule candidate pour une mobilité de couche 1 et de couche 2 - Google Patents

Filtrage de mesures de couche 1 d'une cellule candidate pour une mobilité de couche 1 et de couche 2 Download PDF

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Publication number
WO2024092598A1
WO2024092598A1 PCT/CN2022/129430 CN2022129430W WO2024092598A1 WO 2024092598 A1 WO2024092598 A1 WO 2024092598A1 CN 2022129430 W CN2022129430 W CN 2022129430W WO 2024092598 A1 WO2024092598 A1 WO 2024092598A1
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WIPO (PCT)
Prior art keywords
measurements
candidate cell
time offset
downlink configuration
frequency
Prior art date
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Ceased
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PCT/CN2022/129430
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English (en)
Inventor
Fang Yuan
Yan Zhou
Tao Luo
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Qualcomm Inc
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Qualcomm Inc
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Filing date
Publication date
Application filed by Qualcomm Inc filed Critical Qualcomm Inc
Priority to EP22963910.9A priority Critical patent/EP4612944A1/fr
Priority to CN202280101347.8A priority patent/CN120113272A/zh
Priority to PCT/CN2022/129430 priority patent/WO2024092598A1/fr
Priority to KR1020257011594A priority patent/KR20250099330A/ko
Publication of WO2024092598A1 publication Critical patent/WO2024092598A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • 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
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H04W72/232—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal the control data signalling from the physical layer, e.g. DCI signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI

Definitions

  • the present disclosure relates to wireless communications including filtering layer 1 measurements of a candidate cell for layer 1 and layer 2 mobility.
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts.
  • Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single-carrier frequency division multiple access
  • TD-SCDMA time division synchronous code division multiple access
  • 5G New Radio is part of a continuous mobile broadband evolution promulgated by Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (such as with Internet of Things (IoT) ) , and other requirements.
  • 3GPP Third Generation Partnership Project
  • 5G NR includes services associated with enhanced mobile broadband (eMBB) , massive machine type communications (mMTC) , and ultra-reliable low latency communications (URLLC) .
  • eMBB enhanced mobile broadband
  • mMTC massive machine type communications
  • URLLC ultra-reliable low latency communications
  • Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard.
  • Mobility procedures are performed at layer 3 (L3) using radio resource control (RRC) messaging.
  • RRC radio resource control
  • Mobility procedures allow a user equipment (UE) to move from a source cell to a target cell.
  • Mobility procedures at layer 1 or layer 2 (L1/L2) offer the possibility of improving the speed of mobility over L3 mobility procedures.
  • Legacy measurements in L1 and L2 mobility offer no filtering for measurement results, resulting in unstable L1 measurements for cell switching.
  • the present disclosure provides for filtering layer 1 measurements of a candidate cell for layer 1 and layer 2 mobility. Filtering of L1 measurements can be used for a L1/L2 mobility procedure to increase its robustness.
  • the UE may identify candidate cells (both intra-frequency and inter-frequency) and measurement opportunities of the candidate cells for transmission of an uplink report with filtered L1 measurements. For example, the UE may receive a downlink configuration configuring the UE to report filtered L1 measurements for an intra-frequency candidate cell or an inter-frequency candidate cell. The UE may perform a filtering procedure on L1 measurements of the intra-frequency candidate cell or the inter-frequency candidate cell to obtain the filtered L1 measurements based on the downlink configuration. The UE may transmit an uplink report that includes the filtered L1 measurements of the intra-frequency candidate cell or the inter-frequency candidate cell to facilitate the L1/L2 mobility procedure.
  • the method includes receiving, from a network entity, a downlink configuration configuring a user equipment (UE) to report filtered Layer 1 (L1) measurements for an intra-frequency candidate cell or an inter-frequency candidate cell.
  • the method includes performing a filtering procedure on L1 measurements of the intra-frequency candidate cell or the inter-frequency candidate cell to obtain the filtered L1 measurements based on the downlink configuration.
  • the method includes transmitting, to the network entity, an uplink report comprising the filtered L1 measurements of the intra-frequency candidate cell or the inter-frequency candidate cell.
  • the present disclosure also provides an apparatus (e.g., a UE) including a memory storing computer-executable instructions and at least one processor configured to execute the computer-executable instructions to perform at least one of the above methods, an apparatus including means for performing at least one of the above methods, and a non-transitory computer-readable medium storing computer-executable instructions for performing at least one of the above methods.
  • an apparatus e.g., a UE
  • a memory storing computer-executable instructions and at least one processor configured to execute the computer-executable instructions to perform at least one of the above methods
  • an apparatus including means for performing at least one of the above methods
  • a non-transitory computer-readable medium storing computer-executable instructions for performing at least one of the above methods.
  • the method includes transmitting, to a UE, a downlink configuration configuring the UE to report filtered L1 measurements for an intra-frequency candidate cell or an inter-frequency candidate cell.
  • the method includes receiving, from the UE, an uplink report comprising the filtered L1 measurements of the intra-frequency candidate cell or the inter-frequency candidate cell.
  • the present disclosure also provides an apparatus (e.g., a BS) including a memory storing computer-executable instructions and at least one processor configured to execute the computer-executable instructions to perform at least one of the above methods, an apparatus including means for performing at least one of the above methods, and a non-transitory computer-readable medium storing computer-executable instructions for performing at least one of the above methods.
  • a BS e.g., a BS
  • a memory storing computer-executable instructions and at least one processor configured to execute the computer-executable instructions to perform at least one of the above methods
  • an apparatus including means for performing at least one of the above methods
  • a non-transitory computer-readable medium storing computer-executable instructions for performing at least one of the above methods.
  • FIG. 1 is a diagram illustrating an example of a wireless communications system including an access network.
  • FIG. 2A is a diagram illustrating an example of a first frame.
  • FIG. 2B is a diagram illustrating an example of DL channels within a subframe.
  • FIG. 2C is a diagram illustrating an example of a second frame.
  • FIG. 2D is a diagram illustrating an example of a subframe.
  • FIG. 3 is a diagram illustrating an example of a base station (BS) and user equipment (UE) in an access network.
  • BS base station
  • UE user equipment
  • FIG. 4 is a diagram illustrating an example disaggregated base station architecture.
  • FIG. 5 is a diagram illustrating an example of a layer 1 or layer 2 (L1/L2) mobility scenario.
  • FIG. 6 is a diagram illustrating transmission of channel state information (CSI) /synchronization signal blocks (SSB) for filtering of L1 measurements for candidate cells for both intra-frequency and inter-frequency L1/L2 mobility.
  • CSI channel state information
  • SSB synchronization signal blocks
  • FIG 7 is a message diagram 700 illustrating various messages for facilitating an L1/L2 mobility procedure.
  • FIG. 8 is a conceptual data flow diagram illustrating the data flow between different means/components in an example BS.
  • FIG. 9 is a conceptual data flow diagram illustrating the data flow between different means/components in an example UE.
  • FIG. 10 is a flowchart of an example of a method for a UE to perform filtering of L1 measurements for L1/L2 mobility.
  • FIG. 11 is a flowchart of an example method for a network node to support L1/L2 mobility using UE-based filtered L1 measurements.
  • the described implementations may be implemented in any device, system or network that is capable of transmitting and receiving RF signals according to any of the wireless communication standards, including any of the IEEE 802.11 standards, the standard, code division multiple access (CDMA) , frequency division multiple access (FDMA) , time division multiple access (TDMA) , Global System for Mobile communications (GSM) , GSM/General Packet Radio Service (GPRS) , Enhanced Data GSM Environment (EDGE) , Terrestrial Trunked Radio (TETRA) , Wideband-CDMA (W-CDMA) , Evolution Data Optimized (EV-DO) , 1xEV-DO, EV-DO Rev A, EV-DO Rev B, High Speed Packet Access (HSPA) , High Speed Downlink Packet Access (HSDPA) , High Speed Uplink Packet Access (HSUPA) , Evolved High Speed Packet Access (HSPA+) , Long Term Evolution (LTE) , AMPS, or other known signals that are used
  • Mobility procedures are performed at layer 3 (L3) using radio resource control (RRC) messaging.
  • RRC radio resource control
  • Mobility procedures allow a user equipment (UE) to move from a source cell to a target cell.
  • L3 mobility procedures may involve an interruption or gap in communications as the UE establishes an RRC connection with the target cell.
  • Mobility procedures at layer 1 or layer 2 offer the possibility of improving the speed of mobility over L3 mobility procedures.
  • Legacy measurements in L1 and L2 mobility offer no filtering for measurement results, resulting in unstable L1 measurements for cell switching.
  • the present disclosure provides for filtering layer 1 measurements of a candidate cell for layer 1 and layer 2 mobility. Filtering of L1 measurements can be used for a L1/L2 mobility procedure to increase its robustness.
  • the UE may identify candidate cells (both intra-frequency and inter-frequency) and measurement opportunities of the candidate cells for transmission of an uplink report with filtered L1 measurements. For example, the UE may receive a downlink configuration configuring the UE to report filtered L1 measurements for an intra-frequency candidate cell or an inter-frequency candidate cell.
  • the UE may perform a filtering procedure on L1 measurements of the intra-frequency candidate cell or the inter-frequency candidate cell to obtain the filtered L1 measurements based on the downlink configuration.
  • the UE may transmit an uplink report comprising the filtered L1 measurements of the intra-frequency candidate cell or the inter-frequency candidate cell to facilitate the L1/L2 mobility procedure.
  • L1/L2 mobility procedures may improve the latency of mobility, thereby reducing interruption in communications during mobility.
  • the use of filtered L1 measurements to facilitate the L1/L2 mobility procedure may increase its robustness in various scenarios such as mobility to intra-frequency and inter-frequency candidate cells.
  • L1/L2 mobility may use less signaling overhead than other mobility procedures.
  • processors include microprocessors, microcontrollers, graphics processing units (GPUs) , central processing units (CPUs) , application processors, digital signal processors (DSPs) , reduced instruction set computing (RISC) processors, systems on a chip (SoC) , baseband processors, field programmable gate arrays (FPGAs) , programmable logic devices (PLDs) , state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure.
  • the processor may include an interface or be coupled to an interface that can obtain or output signals.
  • the processor may obtain signals via the interface and output signals via the interface.
  • the interface may be a printed circuit board (PCB) transmission line.
  • the interface may include a wireless transmitter, a wireless transceiver, or a combination thereof.
  • the interface may include a radio frequency (RF) transceiver which can be implemented to receive or transmit signals, or both.
  • RF radio frequency
  • One or more processors in the processing system may execute software.
  • Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • the functions described may be implemented in hardware, software, or any combination thereof. If implemented in software, the functions may be stored on or encoded as one or more instructions or code on a computer-readable medium.
  • Computer-readable media includes computer storage media, which may be referred to as non-transitory computer-readable media. Non-transitory computer-readable media may exclude transitory signals. Storage media may be any available media that can be accessed by a computer.
  • such computer-readable media can include a random-access memory (RAM) , a read-only memory (ROM) , an electrically erasable programmable ROM (EEPROM) , optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of the aforementioned types of computer-readable media, or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.
  • RAM random-access memory
  • ROM read-only memory
  • EEPROM electrically erasable programmable ROM
  • optical disk storage magnetic disk storage
  • magnetic disk storage other magnetic storage devices
  • combinations of the aforementioned types of computer-readable media or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.
  • FIG. 1 is a diagram illustrating an example of a wireless communications system and an access network 100.
  • the wireless communications system (also referred to as a wireless wide area network (WWAN) ) includes base stations 102, UEs 104, an Evolved Packet Core (EPC) 160, and another core network 190 (such as a 5G Core (5GC) ) .
  • the base stations 102 may include macrocells (high power cellular base station) or small cells (low power cellular base station) .
  • the macrocells include base stations.
  • the small cells include femtocells, picocells, and microcells.
  • the small cells include femtocells, picocells, and microcells.
  • the base stations 102 can be configured in a Disaggregated RAN (D-RAN) or Open RAN (O-RAN) architecture, where functionality is split between multiple units such as a central unit (CU) , one or more distributed units (DUs) , or a radio unit (RU) .
  • D-RAN Disaggregated RAN
  • O-RAN Open RAN
  • Such architectures may be configured to utilize a protocol stack that is logically split between one or more units (such as one or more CUs and one or more DUs) .
  • the base stations 102 may be referred to as network nodes or network entities.
  • the CUs may be implemented within an edge RAN node, and in some aspects, one or more DUs may be co-located with a CU, or may be geographically distributed throughout one or multiple RAN nodes.
  • the DUs may be implemented to communicate with one or more RUs.
  • one or more of the UEs 104 may include a mobility component 140 that performs a L1/L2 mobility procedure.
  • the mobility component 140 may include a configuration RX component 142 configured to receive a downlink configuration configuring the UE to report filtered L1 measurements for an intra-frequency candidate cell or an inter-frequency candidate cell.
  • the mobility component 140 may include a measurement component 144 configured to obtain L1 measurements of an intra-frequency candidate cell or an inter-frequency candidate cell.
  • the mobility component 140 may include a filtering component 146 configured to perform a filtering procedure on the L1 measurements of the intra-frequency candidate cell or the inter-frequency candidate cell to obtain the filtered L1 measurements based on the downlink configuration.
  • the mobility component 130 may transmit an uplink report comprising the filtered L1 measurements of the intra-frequency candidate cell or the inter-frequency candidate cell.
  • one or more of the base stations 102 may include a mobility control component 120 configured to manage a L1/L2 mobility procedure for a UE.
  • the mobility control component 120 may include a configuration Tx component 122 configured to transmit a downlink configuration configuring the UE to report filtered L1 measurements for an intra-frequency candidate cell or an inter-frequency candidate cell.
  • the mobility control component 120 may include a L1 measurement reporting Rx component 124 configured to receive an uplink report comprising the filtered L1 measurements of the intra-frequency candidate cell or the inter-frequency candidate cell.
  • the mobility control component 120 may optionally include a trigger component 126 configured to transmit a triggering signal from the active serving cell that triggers the UE to perform the L1 measurement filtering and reporting.
  • the base stations 102 configured for 4G LTE may interface with the EPC 160 through first backhaul links 132 (such as S1 interface) , which may be wired or wireless.
  • the base stations 102 configured for 5G NR may interface with core network 190 through second backhaul links 184, which may be wired or wireless.
  • NG-RAN Next Generation RAN
  • the base stations 102 may perform one or more of the following functions: transfer of user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (such as handover, dual connectivity) , inter-cell interference coordination, connection setup and release, load balancing, distribution for non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS) , subscriber and equipment trace, RAN information management (RIM) , paging, positioning, and delivery of warning messages.
  • the base stations 102 may communicate directly or indirectly (such as through the EPC 160 or core network 190) with each other over third backhaul links 134 (such as X2 interface) .
  • the third backhaul links 134 may be wired or wireless.
  • the base stations 102 may wirelessly communicate with the UEs 104. Each of the base stations 102 may provide communication coverage for a respective geographic coverage area 110. There may be overlapping geographic coverage areas 110. For example, the small cell 102' may have a coverage area 110' that overlaps the coverage area 110 of one or more macro base stations 102.
  • a network that includes both small cell and macrocells may be known as a heterogeneous network.
  • a heterogeneous network also may include Home Evolved Node Bs (eNBs) (HeNBs) , which may provide service to a restricted group known as a closed subscriber group (CSG) .
  • eNBs Home Evolved Node Bs
  • HeNBs Home Evolved Node Bs
  • CSG closed subscriber group
  • the communication links 112 between the base stations 102 and the UEs 104 may include UL (also referred to as reverse link) transmissions from a UE 104 to a base station 102 or DL (also referred to as forward link) transmissions from a base station 102 to a UE 104.
  • the communication links 112 may use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, or transmit diversity.
  • MIMO multiple-input and multiple-output
  • the communication links may be through one or more carriers.
  • the base stations 102 /UEs 104 may use spectrum up to Y MHz (such as 5, 10, 15, 20, 100, 400, etc.
  • the component carriers may include a primary component carrier and one or more secondary component carriers.
  • a primary component carrier may be referred to as a primary cell (PCell) and a secondary component carrier may be referred to as a secondary cell (SCell) .
  • D2D communication link 158 may use the DL/UL WWAN spectrum.
  • the D2D communication link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH) , a physical sidelink discovery channel (PSDCH) , a physical sidelink shared channel (PSSCH) , and a physical sidelink control channel (PSCCH) .
  • sidelink channels such as a physical sidelink broadcast channel (PSBCH) , a physical sidelink discovery channel (PSDCH) , a physical sidelink shared channel (PSSCH) , and a physical sidelink control channel (PSCCH) .
  • sidelink channels such as a physical sidelink broadcast channel (PSBCH) , a physical sidelink discovery channel (PSDCH) , a physical sidelink shared channel (PSSCH) , and a physical sidelink control channel (PSCCH) .
  • D2D communication may be through a variety of wireless D2D communications systems, such as for example, FlashLinQ, WiMedia,
  • the wireless communications system may further include a Wi-Fi access point (AP) 150 in communication with Wi-Fi stations (STAs) 152 via communication links 154 in a 5 GHz unlicensed frequency spectrum.
  • AP Wi-Fi access point
  • STAs Wi-Fi stations
  • communication links 154 in a 5 GHz unlicensed frequency spectrum.
  • the STAs 152 /AP 150 may perform a clear channel assessment (CCA) prior to communicating in order to determine whether the channel is available.
  • CCA clear channel assessment
  • the small cell 102' may operate in a licensed or an unlicensed frequency spectrum. When operating in an unlicensed frequency spectrum, the small cell 102' may employ NR and use the same 5 GHz unlicensed frequency spectrum as used by the Wi-Fi AP 150. The small cell 102', employing NR in an unlicensed frequency spectrum, may boost coverage to or increase capacity of the access network.
  • a base station 102 may include an eNB, gNodeB (gNB) , or other type of base station. Some base stations, such as gNB 180 may operate in one or more frequency bands within the electromagnetic spectrum.
  • gNB gNodeB
  • the electromagnetic spectrum is often subdivided, based on frequency/wavelength, into various classes, bands, channels, etc.
  • two initial operating bands have been identified as frequency range designations FR1 (410 MHz –7.125 GHz) and FR2 (24.25 GHz –52.6 GHz) .
  • the frequencies between FR1 and FR2 are often referred to as mid-band frequencies.
  • FR1 is often referred to (interchangeably) as a “Sub-6 GHz” band in various documents and articles.
  • FR2 which is often referred to (interchangeably) as a “millimeter wave” (mmW) band in documents and articles, despite being different from the extremely high frequency (EHF) band (30 GHz –300 GHz) which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band.
  • EHF extremely high frequency
  • sub-6 GHz or the like if used herein may broadly represent frequencies that may be less than 6 GHz, may be within FR1, or may include mid-band frequencies.
  • millimeter wave or the like if used herein may broadly represent frequencies that may include mid-band frequencies, may be within FR2, or may be within the EHF band.
  • Communications using the mmW radio frequency band have extremely high path loss and a short range.
  • the mmW base station 180 may utilize beamforming 182 with the UE 104 to compensate for the path loss and short range.
  • the EPC 160 may include a Mobility Management Entity (MME) 162, other MMEs 164, a Serving Gateway 166, a Multimedia Broadcast Multicast Service (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC) 170, and a Packet Data Network (PDN) Gateway 172.
  • MME Mobility Management Entity
  • MBMS Multimedia Broadcast Multicast Service
  • BM-SC Broadcast Multicast Service Center
  • PDN Packet Data Network
  • the MME 162 may be in communication with a Home Subscriber Server (HSS) 174.
  • HSS Home Subscriber Server
  • the MME 162 is the control node that processes the signaling between the UEs 104 and the EPC 160.
  • the MME 162 provides bearer and connection management. All user Internet protocol (IP) packets are transferred through the Serving Gateway 166, which itself is connected to the PDN Gateway 172.
  • IP Internet protocol
  • the PDN Gateway 172 provides UE IP address allocation as well as other functions.
  • the PDN Gateway 172 and the BM-SC 170 are connected to the IP Services 176.
  • the IP Services 176 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS) , a PS Streaming Service, or other IP services.
  • the BM-SC 170 may provide functions for MBMS user service provisioning and delivery.
  • the BM-SC 170 may serve as an entry point for content provider MBMS transmission, may be used to authorize and initiate MBMS Bearer Services within a public land mobile network (PLMN) , and may be used to schedule MBMS transmissions.
  • PLMN public land mobile network
  • the MBMS Gateway 168 may be used to distribute MBMS traffic to the base stations 102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area broadcasting a particular service, and may be responsible for session management (start/stop) and for collecting eMBMS related charging information.
  • MMSFN Multicast Broadcast Single Frequency Network
  • the core network 190 may include an Access and Mobility Management Function (AMF) 192, other AMFs 193, a Session Management Function (SMF) 194, and a User Plane Function (UPF) 195.
  • the AMF 192 may be in communication with a Unified Data Management (UDM) 196.
  • the AMF 192 is the control node that processes the signaling between the UEs 104 and the core network 190.
  • the AMF 192 provides QoS flow and session management. All user Internet protocol (IP) packets are transferred through the UPF 195.
  • the UPF 195 provides UE IP address allocation as well as other functions.
  • the UPF 195 is connected to the IP Services 197.
  • the IP Services 197 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS) , a PS Streaming Service, or other IP services.
  • IMS IP Multimedia Subsystem
  • the base station may include or be referred to as a gNB, Node B, eNB, network node, network entity, an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS) , an extended service set (ESS) , a transmit reception point (TRP) , or some other suitable terminology.
  • the base station 102 provides an access point to the EPC 160 or core network 190 for a UE 104.
  • Examples of UEs 104 include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA) , a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (such as a MP3 player) , a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor/actuator, a display, or any other similar functioning device.
  • SIP session initiation protocol
  • PDA personal digital assistant
  • the UEs 104 may be referred to as IoT devices (such as a parking meter, gas pump, toaster, vehicles, heart monitor, etc. ) .
  • the UE 104 also may be referred to as a station, a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.
  • FIG. 2A is a diagram 200 illustrating an example of a first frame.
  • FIG. 2B is a diagram 230 illustrating an example of DL channels within a subframe.
  • FIG. 2C is a diagram 250 illustrating an example of a second frame.
  • FIG. 2D is a diagram 280 illustrating an example of a subframe.
  • the 5G NR frame structure may be FDD in which for a particular set of subcarriers (carrier system bandwidth) , subframes within the set of subcarriers are dedicated for either DL or UL, or may be TDD in which for a particular set of subcarriers (carrier system bandwidth) , subframes within the set of subcarriers are dedicated for both DL and UL.
  • a subset of the total cell bandwidth of a cell is referred to as a Bandwidth Part (BWP) and bandwidth adaptation is achieved by configuring the UE with BWP (s) and telling the UE which of the configured BWPs is currently the active one.
  • BWP Bandwidth Part
  • a narrow bandwidth part refers to a BWP having a bandwidth less than or equal to a maximum configurable bandwidth of a BWP. The bandwidth of the NBWP is less than the carrier system bandwidth.
  • the 5G NR frame structure is assumed to be TDD, with subframe 4 being configured with slot format 28 (with mostly DL) , where D is DL, U is UL, and X is flexible for use between DL/UL, and subframe 3 being configured with slot format 34 (with mostly UL) . While subframes 3, 4 are shown with slot formats 34, 28, respectively, any particular subframe may be configured with any of the various available slot formats 0-61. Slot formats 0, 1 are all DL, UL, respectively. Other slot formats 2-61 include a mix of DL, UL, and flexible symbols.
  • UEs are configured with the slot format (dynamically through DL control information (DCI) , or semi-statically/statically through radio resource control (RRC) signaling) through a received slot format indicator (SFI) .
  • DCI DL control information
  • RRC radio resource control
  • SFI received slot format indicator
  • a frame (10 milliseconds (ms) ) may be divided into 10 equally sized subframes (1 ms) .
  • Each subframe may include one or more time slots.
  • Subframes also may include mini-slots, which may include 7, 4, or 2 symbols.
  • Each slot may include 7 or 14 symbols, depending on the slot configuration. For slot configuration 0, each slot may include 14 symbols, and for slot configuration 1, each slot may include 7 symbols.
  • the symbols on DL may be cyclic prefix (CP) OFDM (CP-OFDM) symbols.
  • the symbols on UL may be CP-OFDM symbols (for high throughput scenarios) or discrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) symbols (also referred to as single carrier frequency-division multiple access (SC-FDMA) symbols) (for power limited scenarios; limited to a single stream transmission) .
  • the number of slots within a subframe is based on the slot configuration and the numerology. For slot configuration 0, different numerologies ⁇ 0 to 5 allow for 1, 2, 4, 8, 16, and 32 slots, respectively, per subframe. For slot configuration 1, different numerologies 0 to 2 allow for 2, 4, and 8 slots, respectively, per subframe. Accordingly, for slot configuration 0 and numerology ⁇ , there are 14 symbols/slot and 2 ⁇ slots/subframe.
  • the subcarrier spacing and symbol length/duration are a function of the numerology.
  • the subcarrier spacing may be equal to 2 ⁇ *15 kHz, where ⁇ is the numerology 0 to 5.
  • the symbol length/duration is inversely related to the subcarrier spacing.
  • the slot duration is 0.25 ms
  • the subcarrier spacing is 60 kHz
  • the symbol duration is approximately 16.67 microseconds ( ⁇ s) .
  • a resource grid may be used to represent the frame structure.
  • Each time slot includes a resource block (RB) (also referred to as physical RBs (PRBs) ) that extends 12 consecutive subcarriers.
  • RB resource block
  • PRBs physical RBs
  • the resource grid is divided into multiple resource elements (REs) . The number of bits carried by each RE depends on the modulation scheme.
  • the RS may include demodulation RS (DM-RS) (indicated as R x for one particular configuration, where 100x is the port number, but other DM-RS configurations are possible) and channel state information reference signals (CSI-RS) for channel estimation at the UE.
  • DM-RS demodulation RS
  • CSI-RS channel state information reference signals
  • the RS also may include beam measurement RS (BRS) , beam refinement RS (BRRS) , and phase tracking RS (PT-RS) .
  • BRS beam measurement RS
  • BRRS beam refinement RS
  • PT-RS phase tracking RS
  • FIG. 2B illustrates an example of various DL channels within a subframe of a frame.
  • the physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs) , each CCE including nine RE groups (REGs) , each REG including four consecutive REs in an OFDM symbol.
  • a primary synchronization signal (PSS) may be within symbol 2 of particular subframes of a frame. The PSS is used by a UE 104 to determine subframe/symbol timing and a L1 identity.
  • a secondary synchronization signal (SSS) may be within symbol 4 of particular subframes of a frame. The SSS is used by a UE to determine a L1 cell identity group number and radio frame timing.
  • the UE can determine a physical cell identifier (PCI) . Based on the PCI, the UE can determine the locations of the aforementioned DM-RS.
  • the physical broadcast channel (PBCH) which carries a master information block (MIB) , may be logically grouped with the PSS and SSS to form a synchronization signal (SS) /PBCH block (SSB) .
  • the MIB provides a number of RBs in the system bandwidth and a system frame number (SFN) .
  • the physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted through the PBCH such as system information blocks (SIBs) , and paging messages.
  • SIBs system information blocks
  • some of the REs carry DM-RS (indicated as R for one particular configuration, but other DM-RS configurations are possible) for channel estimation at the base station.
  • the UE may transmit DM-RS for the physical uplink control channel (PUCCH) and DM-RS for the physical uplink shared channel (PUSCH) .
  • the PUSCH DM-RS may be transmitted in the first one or two symbols of the PUSCH.
  • the PUCCH DM-RS may be transmitted in different configurations depending on whether short or long PUCCHs are transmitted and depending on the particular PUCCH format used.
  • the UE may transmit sounding reference signals (SRS) .
  • the SRS may be transmitted in the last symbol of a subframe.
  • the SRS may have a comb structure, and a UE may transmit SRS on one of the combs.
  • the SRS may be used by a base station for channel quality estimation to enable frequency-dependent scheduling on the UL.
  • FIG. 2D illustrates an example of various UL channels within a subframe of a frame.
  • the PUCCH may be located as indicated in one configuration.
  • the PUCCH carries uplink control information (UCI) , such as scheduling requests, a channel quality indicator (CQI) , a precoding matrix indicator (PMI) , a rank indicator (RI) , and HARQ ACK/NACK feedback.
  • UCI uplink control information
  • the PUSCH carries data, and may additionally be used to carry a buffer status report (BSR) , a power headroom report (PHR) , or UCI.
  • BSR buffer status report
  • PHR power headroom report
  • FIG. 3 is a diagram of an example of a base station 310 and a UE 350 in an access network.
  • IP packets from the EPC 160 may be provided to a controller/processor 375.
  • the controller/processor 375 implements layer 3 and layer 2 functionality.
  • Layer 3 includes a radio resource control (RRC) layer
  • layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer.
  • RRC radio resource control
  • SDAP service data adaptation protocol
  • PDCP packet data convergence protocol
  • RLC radio link control
  • MAC medium access control
  • the controller/processor 375 provides RRC layer functionality associated with broadcasting of system information (such as MIB, SIBs) , RRC connection control (such as RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release) , inter radio access technology (RAT) mobility, and measurement configuration for UE measurement reporting; PDCP layer functionality associated with header compression /decompression, security (ciphering, deciphering, integrity protection, integrity verification) , and handover support functions; RLC layer functionality associated with the transfer of upper layer packet data units (PDUs) , error correction through ARQ, concatenation, segmentation, and reassembly of RLC service data units (SDUs) , re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs) , demultiplexing of MAC SDUs from TBs,
  • the transmit (TX) processor 316 and the receive (RX) processor 370 implement layer 1 functionality associated with various signal processing functions.
  • Layer 1 which includes a physical (PHY) layer, may include error detection on the transport channels, forward error correction (FEC) coding/decoding of the transport channels, interleaving, rate matching, mapping onto physical channels, modulation/demodulation of physical channels, and MIMO antenna processing.
  • the TX processor 316 handles mapping to signal constellations based on various modulation schemes (such as binary phase-shift keying (BPSK) , quadrature phase-shift keying (QPSK) , M-phase-shift keying (M-PSK) , M-quadrature amplitude modulation (M-QAM) ) .
  • BPSK binary phase-shift keying
  • QPSK quadrature phase-shift keying
  • M-PSK M-phase-shift keying
  • M-QAM M-quadrature amplitude modulation
  • the coded and modulated symbols may be split into parallel streams.
  • Each stream may be mapped to an OFDM subcarrier, multiplexed with a reference signal (such as a pilot) in the time or frequency domain, and combined together using an Inverse Fast Fourier Transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream.
  • IFFT Inverse Fast Fourier Transform
  • the OFDM stream is spatially precoded to produce multiple spatial streams.
  • Channel estimates from a channel estimator 374 may be used to determine the coding and modulation scheme, as well as for spatial processing.
  • the channel estimate may be derived from a reference signal or channel condition feedback transmitted by the UE 350.
  • Each spatial stream may be provided to a different antenna 320 via a separate transmitter 318TX.
  • Each transmitter 318TX may modulate an RF carrier with a respective spatial stream for transmission.
  • each receiver 354RX receives a signal through its respective antenna 352.
  • Each receiver 354RX recovers information modulated onto an RF carrier and provides the information to the receive (RX) processor 356.
  • the TX processor 368 and the RX processor 356 implement layer 1 functionality associated with various signal processing functions.
  • the RX processor 356 may perform spatial processing on the information to recover any spatial streams destined for the UE 350. If multiple spatial streams are destined for the UE 350, they may be combined by the RX processor 356 into a single OFDM symbol stream.
  • the RX processor 356 converts the OFDM symbol stream from the time-domain to the frequency domain using a Fast Fourier Transform (FFT) .
  • FFT Fast Fourier Transform
  • the frequency domain signal includes a separate OFDM symbol stream for each subcarrier of the OFDM signal.
  • the symbols on each subcarrier, and the reference signal are recovered and demodulated by determining the most likely signal constellation points transmitted by the base station 310. These soft decisions may be based on channel estimates computed by the channel estimator 358.
  • the soft decisions are decoded and deinterleaved to recover the data and control signals that were originally transmitted by the base station 310 on the physical channel.
  • the data and control signals are provided to the controller/processor 359, which implements layer 3 and layer 2 functionality.
  • the controller/processor 359 can be associated with a memory 360 that stores program codes and data.
  • the memory 360 may be referred to as a computer-readable medium.
  • the controller/processor 359 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets from the EPC 160.
  • the controller/processor 359 is also responsible for error detection using an ACK or NACK protocol to support HARQ operations.
  • the controller/processor 359 provides RRC layer functionality associated with system information (such as MIB, SIBs) acquisition, RRC connections, and measurement reporting; PDCP layer functionality associated with header compression /decompression, and security (ciphering, deciphering, integrity protection, integrity verification) ; RLC layer functionality associated with the transfer of upper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.
  • RRC layer functionality associated with system information (such as MIB, SIBs) acquisition, RRC connections, and measurement reporting
  • PDCP layer functionality associated with header compression /decom
  • Channel estimates derived by a channel estimator 358 from a reference signal or feedback transmitted by the base station 310 may be used by the TX processor 368 to select the appropriate coding and modulation schemes, and to facilitate spatial processing.
  • the spatial streams generated by the TX processor 368 may be provided to different antenna 352 via separate transmitters 354TX. Each transmitter 354TX may modulate an RF carrier with a respective spatial stream for transmission.
  • the UL transmission is processed at the base station 310 in a manner similar to that described in connection with the receiver function at the UE 350.
  • Each receiver 318RX receives a signal through its respective antenna 320.
  • Each receiver 318RX recovers information modulated onto an RF carrier and provides the information to a RX processor 370.
  • the controller/processor 375 can be associated with a memory 376 that stores program codes and data.
  • the memory 376 may be referred to as a computer-readable medium.
  • the controller/processor 375 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets from the UE 350. IP packets from the controller/processor 375 may be provided to the EPC 160.
  • the controller/processor 375 is also responsible for error detection using an ACK or NACK protocol to support HARQ operations.
  • At least one of the TX processor 368, the RX processor 356, and the controller/processor 359 may be configured to perform aspects in connection with the mobility component 140 of FIG. 1.
  • the memory 360 may include executable instructions defining the mobility component 140.
  • the TX processor 368, the RX processor 356, and/or the controller/processor 359 may be configured to execute the mobility component 140.
  • At least one of the TX processor 316, the RX processor 370, and the controller/processor 375 may be configured to perform aspects in connection with the mobility control component 120 of FIG. 1.
  • the memory 376 may include executable instructions defining the mobility control component 120.
  • the TX processor 316, the RX processor 370, and/or the controller/processor 375 may be configured to execute the mobility control component 120.
  • FIG. 4 is a diagram illustrating an example disaggregated base station 400 architecture.
  • the disaggregated base station 400 architecture may include one or more central units (CUs) 410 that can communicate directly with a core network 420 via a backhaul link, or indirectly with the core network 420 through one or more disaggregated base station units (such as a Near-Real Time (Near-RT) RAN Intelligent Controller (RIC) 425 via an E2 link, or a Non-Real Time (Non-RT) RIC 415 associated with a Service Management and Orchestration (SMO) Framework 405, or both) .
  • a CU 410 may communicate with one or more distributed units (DUs) 430 via respective midhaul links, such as an F1 interface.
  • DUs distributed units
  • the DUs 430 may communicate with one or more radio units (RUs) 440 via respective fronthaul links.
  • the RUs 440 may communicate with respective UEs 104 via one or more radio frequency (RF) access links.
  • RF radio frequency
  • the UE 104 may be simultaneously served by multiple RUs 440.
  • Each of the units may include one or more interfaces or be coupled to one or more interfaces configured to receive or transmit signals, data, or information (collectively, signals) via a wired or wireless transmission medium.
  • Each of the units, or an associated processor or controller providing instructions to the communication interfaces of the units can be configured to communicate with one or more of the other units via the transmission medium.
  • the units can include a wired interface configured to receive or transmit signals over a wired transmission medium to one or more of the other units.
  • the units can include a wireless interface, which may include a receiver, a transmitter or transceiver (such as a radio frequency (RF) transceiver) , configured to receive or transmit signals, or both, over a wireless transmission medium to one or more of the other units.
  • a wireless interface which may include a receiver, a transmitter or transceiver (such as a radio frequency (RF) transceiver) , configured to receive or transmit signals, or both, over a wireless transmission medium to one or more of the other units.
  • RF radio frequency
  • the CU 410 may host one or more higher layer control functions.
  • control functions can include radio resource control (RRC) , packet data convergence protocol (PDCP) , service data adaptation protocol (SDAP) , or the like.
  • RRC radio resource control
  • PDCP packet data convergence protocol
  • SDAP service data adaptation protocol
  • Each control function can be implemented with an interface configured to communicate signals with other control functions hosted by the CU 410.
  • the CU 410 may be configured to handle user plane functionality (i.e., Central Unit –User Plane (CU-UP) ) , control plane functionality (i.e., Central Unit –Control Plane (CU-CP) ) , or a combination thereof.
  • the CU 410 can be logically split into one or more CU-UP units and one or more CU-CP units.
  • the CU-UP unit can communicate bidirectionally with the CU-CP unit via an interface, such as the E1 interface when implemented in an O-RAN configuration.
  • the CU 410 can be implemented to communicate with the DU 430, as necessary, for network control and signaling.
  • the DU 430 may correspond to a logical unit that includes one or more base station functions to control the operation of one or more RUs 440.
  • the DU 430 may host one or more of a radio link control (RLC) layer, a medium access control (MAC) layer, and one or more high physical (PHY) layers (such as modules for forward error correction (FEC) encoding and decoding, scrambling, modulation and demodulation, or the like) depending, at least in part, on a functional split, such as those defined by the 3 rd Generation Partnership Project (3GPP) .
  • the DU 430 may further host one or more low PHY layers. Each layer (or module) can be implemented with an interface configured to communicate signals with other layers (and modules) hosted by the DU 430, or with the control functions hosted by the CU 410.
  • Lower-layer functionality can be implemented by one or more RUs 440.
  • an RU 440 controlled by a DU 430, may correspond to a logical node that hosts RF processing functions, or low-PHY layer functions (such as performing fast Fourier transform (FFT) , inverse FFT (iFFT) , digital beamforming, physical random access channel (PRACH) extraction and filtering, or the like) , or both, based at least in part on the functional split, such as a lower layer functional split.
  • the RU (s) 440 can be implemented to handle over the air (OTA) communication with one or more UEs 104.
  • OTA over the air
  • real-time and non-real-time aspects of control and user plane communication with the RU (s) 440 can be controlled by the corresponding DU 430.
  • this configuration can enable the DU (s) 430 and the CU 410 to be implemented in a cloud-based RAN architecture, such as a vRAN architecture.
  • the SMO Framework 405 may be configured to support RAN deployment and provisioning of non-virtualized and virtualized network elements.
  • the SMO Framework 405 may be configured to support the deployment of dedicated physical resources for RAN coverage requirements which may be managed via an operations and maintenance interface (such as an O1 interface) .
  • the SMO Framework 405 may be configured to interact with a cloud computing platform (such as an open cloud (O-Cloud) 490) to perform network element life cycle management (such as to instantiate virtualized network elements) via a cloud computing platform interface (such as an O2 interface) .
  • a cloud computing platform such as an open cloud (O-Cloud) 490
  • network element life cycle management such as to instantiate virtualized network elements
  • a cloud computing platform interface such as an O2 interface
  • Such virtualized network elements can include, but are not limited to, CUs 410, DUs 430, RUs 440 and Near-RT RICs 425.
  • the SMO Framework 405 can communicate with a hardware aspect of a 4G RAN, such as an open eNB (O-eNB) 411, via an O1 interface. Additionally, in some implementations, the SMO Framework 405 can communicate directly with one or more RUs 440 via an O1 interface.
  • the SMO Framework 405 also may include a Non-RT RIC 415 configured to support functionality of the SMO Framework 405.
  • the Non-RT RIC 415 may be configured to include a logical function that enables non-real-time control and optimization of RAN elements and resources, Artificial Intelligence/Machine Learning (AI/ML) workflows including model training and updates, or policy-based guidance of applications/features in the Near-RT RIC 425.
  • the Non-RT RIC 415 may be coupled to or communicate with (such as via an A1 interface) the Near-RT RIC 425.
  • the Near-RT RIC 425 may be configured to include a logical function that enables near-real-time control and optimization of RAN elements and resources via data collection and actions over an interface (such as via an E2 interface) connecting one or more CUs 410, one or more DUs 430, or both, as well as an O-eNB, with the Near-RT RIC 425.
  • the Non-RT RIC 415 may receive parameters or external enrichment information from external servers. Such information may be utilized by the Near-RT RIC 425 and may be received at the SMO Framework 405 or the Non-RT RIC 415 from non-network data sources or from network functions.
  • the Non-RT RIC 415 or the Near-RT RIC 425 may be configured to tune RAN behavior or performance.
  • the Non-RT RIC 415 may monitor long-term trends and patterns for performance and employ AI/ML models to perform corrective actions through the SMO Framework 405 (such as reconfiguration via O1) or via creation of RAN management policies (such as A1 policies) .
  • FIG. 5 is a diagram illustrating an example of a L1/L2 mobility scenario 500.
  • a UE 104 may initially be served by an active serving cell 510, which may be referred to as a special cell (SpCell) .
  • L1/L2 mobility may allow the SpCell to be updated via L1/L2 signaling based on L1 measurements.
  • the scenario 500 may apply to a single SpCell change without carrier aggregation (CA) .
  • L1/L2 mobility may apply to both intra-frequency mobility and inter-frequency mobility.
  • the UE 104 may determine a target candidate cell 520a from a set of candidate cells 520.
  • the set of candidate cells 520 may include candidate cells 520a, 520b, and 520c.
  • the target candidate cell 520a may be selected based on, for example, L1 measurement.
  • L1/L2 mobility may include mechanisms and procedures of L1/L2 based inter-cell mobility for mobility latency reduction. For example, configuration and maintenance for multiple candidate cells may allow fast application of configurations for candidate cells 520.
  • a dynamic switch mechanism among candidate serving cells including SpCells and secondary cells (SCells) ) may satisfy multiple potential applicable scenarios based on L1/L2 signaling.
  • L1 enhancements for inter-cell beam management, including L1 measurement and reporting, and beam indication may facilitate L1/L2 mobility.
  • Timing Advance management for candidate cells may facilitate L1/L2 mobility.
  • CU-DU interface signaling to support L1/L2 mobility may be applicable in a distributed architecture.
  • Example L1/L2 mobility scenarios include: Standalone, CA and NR-DC cases with serving cell change within one cell group (CG) ; Intra-DU case and intra-CU inter-DU case (applicable for Standalone and CA) ; both intra-frequency and inter-frequency mobility; both FR1 and FR2 frequency ranges; and when source and target cells are synchronized or non-synchronized.
  • FIG. 6 is a diagram illustrating transmission of channel state information (CSI) /synchronization signal blocks (SSB) for filtering of L1 measurements for candidate cells for both intra-frequency and inter-frequency L1/L2 mobility.
  • the UE can be configured to report filtered multiple L1 measurements for a candidate cell.
  • the filtering coefficients may be configured by the base station, e.g., per CSI report configuration.
  • the filtering coefficients are fixed, or predetermined, e.g., per candidate cell.
  • the filtering can be applied at least to periodic, or semi-persistent measurements, and the output of filtering multiple L1 measurements is reported.
  • the UE may determine the average of a time series of L1 measurements.
  • the UE may apply weighting factors to the time series of L1 measurements.
  • the UE can be configured with a minimum number of L1 measurements for reporting a filtered L1 measurement for a candidate cell.
  • the minimum number of L1 measurements can be configured by the base station, e.g., per CSI report configuration.
  • the UE can be configured to report filtered L1 measurement on resources such as SSB or CSI-RS, with enhanced CSI processing time for filtered measurement reporting for a candidate cell.
  • a minimum time offset parameter (Z) between the end of the last symbol of the PDCCH triggering the CSI report and the first symbol of CSI reporting can be defined for filtered L1 measurement.
  • the minimum time offset parameter (Z’ ) between the end of the last resource in time of the latest of the measured resources and the first resource of CSI reporting can be defined for filtered L1 measurement.
  • a downlink signal triggering the L1 measurement reporting (e.g., 610) is transmitted by the active serving cell 510 at a first time that is offset from the end of the last resource associated with the candidate cell by a third time offset exceeding the first time offset (e.g., 642) .
  • an uplink report 630 can be transmitted at a second time that is offset from the end of the last resource associated with the candidate cell by a fourth time offset exceeding the second time offset (e.g., 640) .
  • the UE may report these minimum time offset parameters (Z and Z’) via a UE capability message.
  • the UE can be configured to be triggered by DCI (e.g., 610) with multiple repetition occasions for aperiodic channel measurements and report the corresponding filtered L1 measurement in a CSI report for a candidate cell.
  • DCI e.g., 610
  • the configuration may indicate an interval or periodicity (e.g., P) and a number of repetitions for aperiodic channel measurement resources (e.g., 620) .
  • the UE may derive the channel measurements for computing a CSI value reported in an uplink slot n based on the number of measurement occasions relative to the CSI reference resource, which may be associated with a CSI resource setting.
  • FIG 7 is a message diagram 700 illustrating various messages for facilitating an L1/L2 mobility procedure.
  • the active serving cell 510 may transmit a downlink configuration 710 for L1 measurement filtering.
  • the downlink configuration 710 may be an RRC configuration message, MAC-CE, or DCI that configures the UE 104 to report filtered L1 measurements for an intra-frequency candidate cell (e.g., or an inter-frequency candidate cell.
  • the downlink configuration indicates filtering coefficients for one or more CSI report configurations.
  • the filtering coefficients are fixed in value for one or more candidate cells.
  • the downlink configuration further configures the UE 104 to trigger L1 measurement reporting of aperiodic channel measurement resources by downlink control information (DCI) signaling.
  • DCI downlink control information
  • the downlink configuration further indicates a number of repetitions associated with aperiodic channel measurement resources and a periodicity between the number of repetitions.
  • the active serving cell 510 may transmit a triggering signal 720, 762 that triggers the L1 measurement filtering and reporting.
  • the triggering signal 720 may be a DCI message from the active serving cell 510.
  • the triggering signal 720 may be a media access control (MAC) control element (CE) transmitted by the active serving cell 510.
  • the triggering signal 720 is a radio resource control (RRC) configuration or reconfiguration of the candidate cell 520.
  • RRC radio resource control
  • the candidate SpCell 520 may transmit a CSI/SSB 730.
  • An intra-frequency candidate cell 520b may be a candidate cell that operates on a same carrier bandwidth, active bandwidth portion (BWP) , center frequency, and has the same subcarrier spacing (SCS) as the active serving cell 510.
  • BWP active bandwidth portion
  • SCS subcarrier spacing
  • the intra-frequency candidate cell 520b may be inactive until selected for mobility.
  • the intra-frequency candidate cell 520b may transmit the SSB on the center frequency within an active BWP on a carrier bandwidth.
  • the UE 104 may also measure signal quality of the candidate cell 520 based on the CSI/SSB 730.
  • the candidate cell 520 may transmit an SSB 740.
  • the UE 104 may also measure signal quality of the candidate cell 520 based on the SSB 740.
  • An inter-frequency candidate cell 520a may be a candidate SpCell that differs in center frequency, SCS, active BWP, or carrier bandwidth from the active serving cell 510.
  • the inter-frequency candidate cell 520a may transmit an SSB within an active BWP of the active serving cell 510 but with a center frequency or SCS that is different than the SSB of the active serving cell 510.
  • the inter-frequency candidate cell 520a may transmit an SSB outside of the active BWP of the active serving cell 510 but within the configured carrier bandwidth of the active serving cell 510.
  • the inter-frequency candidate cell 520a may transmit an SSB outside of the configured carrier bandwidth of the active serving cell 510 (e.g., in a different carrier bandwidth) .
  • the UE 104 may receive the appropriate SSBs 730, 740 to obtain L1 measurements for the configured or indicated candidate cells 520.
  • the L1 measurements include periodic measurements or semi-persistent measurements.
  • the UE 104 may obtain a configurable number of L1 measurements based on the downlink configuration.
  • the UE 104 may obtain a fixed (or predetermined) number of L1 measurements.
  • the UE 104 can obtain L1 measurements of the aperiodic channel measurement resources based on the number of repetitions and the periodicity indicated in the downlink configuration.
  • the UE 104 can obtain L1 measurements of the aperiodic channel measurement resources for filtering based on a number of occasions following a start of one of the aperiodic channel measurement resources configured as a reference resource.
  • the UE 104 may perform a filtering procedure on the L1 measurements.
  • the filtering procedure is applied to the periodic measurements or the semi-persistent measurements.
  • the UE 104 may determine an average of a time series of the L1 measurements.
  • the UE 104 may apply one or more weighting factors to a time series of the L1 measurements.
  • the UE 104 may report the filtered L1 measurements via an uplink report 760 to the active serving cell 510. For example, the UE 104 may transmit a PUSCH containing the channel measurement report along with the filtered L1 measurements.
  • the UE 104 may transmit, to the active serving cell 510, a UE capability message indicating a first minimum time offset parameter and a second minimum time offset parameter (not shown) .
  • the first minimum time offset parameter indicates a first time offset between an end of a last resource of a downlink signal triggering L1 measurement reporting and a start of a first resource of the L1 measurement reporting.
  • the second minimum time offset parameter indicates a second time offset between an end of a last resource associated with a candidate cell and the start of the first resource of the L1 measurement reporting.
  • the downlink signal triggering the L1 measurement reporting (e.g., the triggering signal 720) is transmitted by the active serving cell 510 at a first time that is offset from the end of the last resource associated with the candidate cell by a third time offset exceeding the first time offset. Thereafter, the uplink report can be transmitted at a second time that is offset from the end of the last resource associated with the candidate cell by a fourth time offset exceeding the second time offset. This allows the UE 104 sufficient time to process and filter the L1 measurements and transmit its uplink report of the filtered L1 measurements.
  • the L1/L2 mobility procedure may include an L1/L2 handover command 770 from either the candidate cell 520 or the active serving cell 510.
  • FIG. 8 is a conceptual data flow diagram 800 illustrating the data flow between different means/components in an example base station 802 (e.g., a network node) , which may be an example of the base station 102 including the mobility control component 120.
  • the mobility control component 120 may be implemented by the memory 376 and the TX processor 316, the RX processor 370, and/or the controller/processor 375 of FIG. 3.
  • the memory 376 may store executable instructions defining the mobility control component 120 and the TX processor 316, the RX processor 370, and/or the controller/processor 375 may execute the instructions.
  • the base station 102 may include a receiver component 870, which may include, for example, a radio frequency (RF) receiver for receiving the signals described herein.
  • the base station 102 may include a transmitter component 872, which may include, for example, an RF transmitter for transmitting the signals described herein.
  • the receiver component 870 and the transmitter component 872 may co-located in a transceiver such as illustrated by the TX/RX 318 in FIG. 3.
  • the mobility control component 120 may include the configuration Tx component 122 and the L1 measurement reporting Rx component 124.
  • the mobility control component 120 may optionally include the triggering component 126 or an indication component 810.
  • the receiver component 870 may receive UL signals from the UE 104 including UL communications. In some implementations, the receiver component 870 may optionally receive an UE capability message or the uplink report containing the filtered L1 measurements. The receiver component 870 may provide the uplink report to the L1 measurement reporting Rx component 124.
  • the configuration Tx component 122 may be configured to transmit a downlink configuration configuring the UE to report filtered L1 measurements for an intra-frequency candidate cell or an inter-frequency candidate cell.
  • the downlink configuration indicates filtering coefficients for one or more CSI report configurations.
  • the downlink configuration indicates filtering coefficients that are fixed in value for one or more candidate cells.
  • the downlink configuration further configures the UE to obtain a configurable number of L1 measurements associated with one or more candidate cells.
  • the downlink configuration further configures the UE to trigger L1 measurement reporting of aperiodic channel measurement resources by DCI signaling.
  • the downlink configuration further indicates a number of repetitions associated with the aperiodic channel measurement resources and a periodicity between the number of repetitions.
  • the UE may obtain L1 measurements of the aperiodic channel measurement resources based on the number of repetitions and the periodicity.
  • the L1 measurement reporting Rx component 124 may be configured to receive the uplink report containing the filtered L1 measurements.
  • the filtered L1 measurements may be used by the base station 802 to facilitate a layer 1 or layer 2 mobility procedure for a UE from an active serving cell to the candidate cell.
  • the L1 measurement reporting Rx component 124 may obtain the uplink message via the receiver component 870.
  • the L1 measurement reporting Rx component 124 may process the filtered L1 measurements to obtain stable channel measurements for cell switching.
  • the optional trigger component 126 may be configured to transmit a triggering signal from the active serving cell that triggers the UE to perform the L1 measurement filtering and reporting.
  • the trigger component 126 may transmit the triggering signal at a time that satisfies a minimum time offset parameter provided by the UE via the UE capability message.
  • the trigger signal may have various forms such as an RRC configuration, MAC-CE, or DCI including a PDCCH order.
  • the trigger component 126 may output the trigger signal for transmission via the transmitter component 872.
  • the optional indication component 810 may be configured to transmit an indication from the active serving cell that indicates the configuration of the L1 measurement filtering.
  • the indication component 810 may receive information regarding the UE such as uplink channel state information and measurements via the receiver component 870.
  • the indication component 810 may obtain information of candidate cells via a backhaul.
  • the indication component 810 may generate an indication 740 of one or more candidate cells for the UE.
  • the indication component 810 may output the indication 740 for transmission via the transmitter component 872.
  • FIG. 9 is a conceptual data flow diagram 900 illustrating the data flow between different means/components in an example UE 904, which may be an example of the UE 104 and include the mobility component 140.
  • the mobility component 140 may be implemented by the memory 360 and the TX processor 368, the RX processor 356, and/or the controller/processor 359.
  • the memory 360 may store executable instructions defining the mobility component 140 and the TX processor 368, the RX processor 356, and/or the controller/processor 359 may execute the instructions.
  • the UE 104 may include a receiver component 970, which may include, for example, a RF receiver for receiving the signals described herein.
  • the UE 104 may include a transmitter component 972, which may include, for example, an RF transmitter for transmitting the signals described herein.
  • the receiver component 970 and the transmitter component 972 may co-located in a transceiver such as the TX/RX 352 in FIG. 3.
  • the mobility component 140 may include the configuration RX component 142, the measurement component 144, and the filtering component 146.
  • the receiver component 970 may receive DL signals described herein such as the CSI/SSBs 730 or 740, the downlink configuration 710, the triggering signal 720, or the L1/L2 handover command 770.
  • the receiver component 970 may provide the CSI/SSBs 730 or 740 to the measurement component 144.
  • the receiver component 970 provides the downlink indication 710 and/or the triggering signals 720 to the configuration RX component 142.
  • the configuration RX component 142 may be configured to receive the downlink configuration that configures the UE to perform the L1 measurement filtering and reporting at the UE. In an aspect, the configuration RX component 142 determines that the downlink configuration indicates filtering coefficients for one or more CSI report configurations. In another aspect, the configuration RX component 142 determines that the downlink configuration configures the UE to obtain a configurable number of L1 measurements based on the downlink configuration. In another aspect, the configuration RX component 142 determines that the downlink configuration configures the UE to trigger L1 measurement reporting of aperiodic channel measurement resources by DCI signaling. In another aspect, the configuration RX component 142 determines that the downlink configuration further indicates a number of repetitions associated with the aperiodic channel measurement resources and a periodicity between the number of repetitions.
  • the measurement component 144 may be configured to obtain L1 measurements (e.g., L1 RSRP based on the CSI/SSBs 730, 740) for a layer 1 or layer 2 mobility procedure. In some implementations, the measurement component 144 may receive the CSI/SSBs 730, 740 via the receiver component 970. In an aspect, the measurement component 144 may obtain a configurable number of L1 measurements based on the downlink configuration for a CSI report. In another aspect, the measurement component 144 may obtain a fixed (or predetermined) number of L1 measurements for a CSI report. In another aspect, the measurement component 144 may obtain L1 measurements of the aperiodic channel measurement resources based on the number of repetitions and the periodicity as indicated in the downlink configuration.
  • L1 measurements e.g., L1 RSRP based on the CSI/SSBs 730, 740
  • the measurement component 144 may receive the CSI/SSBs 730, 740 via the receiver component 970.
  • the filtering component 146 may perform a filtering procedure on L1 measurements of the intra-frequency candidate cell or the inter-frequency candidate cell to obtain the filtered L1 measurements based on the downlink configuration.
  • the filtering component 146 may receive the L1 measurements via the measurement component 144.
  • the filtering component 146 may perform the filtering procedure using configurable filtering coefficients for one or more CSI report configurations based on the downlink configuration. For example, different CSI reports may have different filtering coefficients.
  • the filtering component 146 may perform the filtering procedure using filtering coefficients that are fixed in value for one or more candidate cells. For example, different candidate cells may have a fixed common filtering coefficient.
  • the filtering component 146 may apply the filtering procedure to periodic channel measurements or semi-persistent channel measurements. In an aspect, the filtering component 146 may perform the filtering procedure by determining an average of a time series of the L1 measurements. In another aspect, the filtering component 146 may perform the filtering procedure by applying one or more weighting factors to a time series of the L1 measurements.
  • the transmitter component 972 may transmit a UE capability message indicating a first minimum time offset parameter and a second minimum time offset parameter.
  • the first and the second minimum time offset parameters may be a number of X and Y symbols, respectively.
  • the first minimum time offset parameter indicates a first time offset between an end of a last resource of a downlink signal triggering L1 measurement reporting and a start of a first resource of the L1 measurement reporting.
  • the second minimum time offset parameter indicates a second time offset between an end of a last resource associated with a candidate cell and the start of the first resource of the L1 measurement reporting.
  • the receiver component 970 may receive the downlink signal triggering the L1 measurement reporting at a first time that is offset from the end of the last resource associated with the candidate cell by a third time offset exceeding the first time offset. Thereafter, the filtering component 146 via the transmitter component 972 may transmit the uplink report with the filtered L1 measurements at a second time that is offset from the end of the last resource associated with the candidate cell by a fourth time offset exceeding the second time offset.
  • FIG. 10 is a flowchart of an example of a method for a UE to perform filtering of L1 measurements for L1/L2 mobility.
  • the method 1000 may be performed by a UE (such as the UE 104, which may include the memory 360 and which may be the entire UE 104 or a component of the UE 104 such as the mobility component 140, TX processor 368, the RX processor 356, or the controller/processor 359) .
  • the method 1000 may be performed by the mobility component 140 in communication with the mobility control component 120 of the base station 102.
  • Optional blocks are shown with dashed lines.
  • the method 1000 may include transmitting a UE capability message indicating a first minimum time offset parameter and a second minimum time offset parameter.
  • the first minimum time offset parameter indicates a first time offset between an end of a last resource of a downlink signal triggering L1 measurement reporting and a start of a first resource of the L1 measurement reporting.
  • the second minimum time offset parameter indicates a second time offset between an end of a last resource associated with a candidate cell and the start of the first resource of the L1 measurement reporting.
  • the method 1000 may include receiving a downlink configuration configuring the UE to report filtered L1 measurements for an intra-frequency candidate cell or an inter-frequency candidate cell.
  • the UE 104, the RX processor 356 or the controller/processor 359 may execute the mobility component 140 or the configuration RX component 142 to receive configuration of the L1 measurement filtering and reporting.
  • the UE 104, the RX processor 356, or the controller/processor 359 executing the mobility component 140 or the configuration RX component 142 may provide means for receiving the downlink configuration of a RACH including RACH occasions for a candidate cell.
  • the method 1000 includes receiving the downlink signal triggering the L1 measurement filtering and reporting.
  • the method 1000 includes obtaining L1 measurements of the intra-frequency candidate cell or the inter-frequency candidate cell.
  • the block 1030 may optionally include obtaining L1 measurements of aperiodic channel measurement resources for filtering based on a number of time occasions following a start of one of the aperiodic channel measurement resources configured as a reference resource.
  • the block 1030 may optionally include receiving a SSB 730 that is transmitted by a candidate cell 520.
  • the candidate cell may be an intra-frequency candidate cell 520b that has a same frequency, sub-carrier spacing, and bandwidth part as the active serving cell 510.
  • the block 1030 may optionally include receiving a CSI/SSB 740 that is transmitted by the candidate cell 520.
  • the candidate cell 520 may be an inter-frequency candidate cell 520a.
  • the inter-frequency candidate cell 520a may transmit the CSI/SSB 740 outside of a configured bandwidth of the active serving cell 510.
  • the inter-frequency candidate cell 520a may transmit the CSI/SSB 740 outside of an active bandwidth part of the active serving cell 510 but within a configured bandwidth of the active serving cell 510.
  • the inter-frequency candidate cell 520a may transmit the CSI/SSB 740 within an active bandwidth part of the active serving cell 510 but with a center frequency or sub-carrier spacing that is different than an CSI/SSB of the active serving cell 510.
  • the method 1000 includes performing a filtering procedure on L1 measurements of the intra-frequency candidate cell or the inter-frequency candidate cell to obtain the filtered L1 measurements.
  • the UE 104, the TX processor 368, or the controller/processor 359 may execute the mobility component 140 or the filtering component 146 to perform the L1 measurement filtering procedure.
  • the block 1040 may optionally include determining an average of a time series of the L1 measurements.
  • the block 1040 may optionally include applying one or more weighting factors to a time series of the L1 measurements.
  • the UE 104, the TX processor 368, or the controller/processor 359 executing the mobility component 140 or the filtering component 146 may provide means for performing a filtering procedure on L1 measurements of the intra-frequency candidate cell or the inter-frequency candidate cell to obtain the filtered L1 measurements.
  • the method 1000 includes transmitting an uplink report comprising the filtered L1 measurements of the intra-frequency candidate cell or the inter-frequency candidate cell.
  • the UE 104, the TX processor 368 or the controller/processor 359 may execute the mobility component 140 or the transmitter component 972 to transmit the uplink report containing the filtered L1 measurements.
  • the UE 104, the TX processor 368, or the controller/processor 359 executing the mobility component 140 or the transmitter component 972 may provide means for transmitting an uplink report comprising the filtered L1 measurements of the intra-frequency candidate cell or the inter-frequency candidate cell.
  • FIG. 11 is a flowchart of an example method for a network node to support L1/L2 mobility using UE-based filtered L1 measurements.
  • the method 1100 may be performed by a network node (such as the base station 102, which may include the memory 376 and which may be the entire base station 102 or a component of the base station 102 such as the mobility control component 120, the TX processor 316, the RX processor 370, or the controller/processor 375) .
  • the method 1100 may be performed by the mobility control component 120 in communication with the mobility component 140 of the UE 104.
  • the method 1100 includes receiving a UE capability message indicating a first minimum time offset parameter and a second minimum time offset parameter.
  • base station 102, the RX processor 370, or the controller/processor 375 may execute the mobility control component 120 or the configuration Tx component 122 to receive the UE capability message.
  • the base station 102, the RX processor 370, or the controller/processor 375 executing the mobility control component 120 or the configuration Tx component 122 may provide means for receiving a UE capability message indicating a first minimum time offset parameter and a second minimum time offset parameter.
  • the method 1100 includes transmitting a downlink configuration configuring the UE to report filtered L1 measurements for an intra-frequency candidate cell or an inter-frequency candidate cell.
  • the base station 102, the TX processor 316, or the controller/processor 375 may execute the mobility control component 120 or the configuration Tx component 122 to transmit a downlink configuration configuring the UE to report filtered L1 measurements for an intra-frequency candidate cell or an inter-frequency candidate cell.
  • the candidate cell may be an intra-frequency candidate cell 520b that has a same frequency, sub-carrier spacing, and bandwidth part as the active serving cell 510.
  • the block 1030 may optionally include receiving a CSI/SSB 740 that is transmitted by the candidate cell 520.
  • the candidate cell 520 may be an inter-frequency candidate cell 520a.
  • the inter-frequency candidate cell 520a may transmit the CSI/SSB 740 outside of a configured bandwidth of the active serving cell 510.
  • the inter-frequency candidate cell 520a may transmit the CSI/SSB 740 outside of an active bandwidth part of the active serving cell 510 but within a configured bandwidth of the active serving cell 510.
  • the inter-frequency candidate cell 520a may transmit the CSI/SSB 740 within an active bandwidth part of the active serving cell 510 but with a center frequency or sub-carrier spacing that is different than an CSI/SSB of the active serving cell 510. Accordingly, the base station 102, the TX processor 316, or the controller/processor 375 executing the mobility control component 120 or the configuration Tx component 122 may provide means for transmitting a downlink configuration configuring the UE to report filtered L1 measurements for an intra-frequency candidate cell or an inter-frequency candidate cellv.
  • the method 1100 may optionally include transmitting a triggering signal triggering the L1 measurement filtering and reporting.
  • the base station 102, the RX processor 370, or the controller/processor 375 may execute the mobility control component 120 or triggering component 126 to transmit the triggering signal 720 from the active serving cell 510 that triggers the UE 104 to perform the L1 measurement filtering and reporting.
  • the triggering signal may be a DCI from the active serving cell 510.
  • the triggering signal may be MAC-CE transmitted by the active serving cell 510.
  • the triggering signal may be a RRC configuration or reconfiguration of the candidate cell 520. Accordingly, the base station 102, the RX processor 370, or the controller/processor 375 executing the mobility control component 120 or triggering component 126 may provide means for transmitting a triggering signal triggering the L1 measurement filtering and reporting.
  • the method 1100 includes receiving an uplink report comprising the filtered L1 measurements of the intra-frequency candidate cell or the inter-frequency candidate cell.
  • base station 102, the RX processor 370, or the controller/processor 375 may execute the mobility control component 120 or the L1 measurement Rx component 124 to receive the uplink report containing the filtered L1 measurements.
  • the base station 102, the RX processor 370, or the controller/processor 375 executing the mobility control component 120 or the L1 measurement Rx component 124 may provide means for receiving an uplink report comprising the filtered L1 measurements of the intra-frequency candidate cell or the inter-frequency candidate cell.
  • Aspect 1 is a method of wireless communication performed by a user equipment (UE) , the method comprising receiving, from a network entity, a downlink configuration configuring the UE to report filtered Layer 1 (L1) measurements for an intra-frequency candidate cell or an inter-frequency candidate cell; performing a filtering procedure on L1 measurements of the intra-frequency candidate cell or the inter-frequency candidate cell to obtain the filtered L1 measurements based on the downlink configuration; and transmitting, to the network entity, an uplink report comprising the filtered L1 measurements of the intra-frequency candidate cell or the inter-frequency candidate cell.
  • L1 Layer 1
  • the method of Aspect 1 further includes that the downlink configuration indicates filtering coefficients for one or more channel state information (CSI) report configurations.
  • CSI channel state information
  • the method of any of Aspect 1 or Aspect 2 further includes that the filtering procedure is performed using one or more filtering coefficients that are fixed in value for one or more candidate cells.
  • the method of any of Aspects 1-3 further includes that the L1 measurements comprises periodic measurements or semi-persistent measurements, and wherein the filtering procedure is applied to the periodic measurements or the semi-persistent measurements.
  • the method of any of Aspects 1-4 further includes that the performing the filtering procedure comprises determining an average of a time series of the L1 measurements.
  • the method of any of Aspects 1-5 further includes that the performing the filtering procedure comprises applying one or more weighting factors to a time series of the L1 measurements.
  • the method of any of Aspects 1-6 further includes obtaining a configurable number of L1 measurements based on the downlink configuration, or obtain a fixed number of L1 measurements.
  • the method of any of Aspects 1-7 further includes transmitting, to the network entity, a UE capability message indicating a first minimum time offset parameter and a second minimum time offset parameter, the first minimum time offset parameter indicating a first time offset between an end of a last resource of a downlink signal triggering L1 measurement reporting and a start of a first resource of the L1 measurement reporting, and the second minimum time offset parameter indicating a second time offset between an end of a last resource associated with a candidate cell and the start of the first resource of the L1 measurement reporting; and receiving, from the network entity, the downlink signal triggering the L1 measurement reporting at a first time that is offset from the end of the last resource associated with the candidate cell by a third time offset exceeding the first time offset, wherein the uplink report is transmitted at a second time that is offset from the end of the last resource associated with the candidate cell by a fourth time offset exceeding the second time offset.
  • the method of any of Aspects 1-8 further includes that the downlink configuration further configures the UE to trigger L1 measurement reporting of aperiodic channel measurement resources by downlink control information (DCI) signaling.
  • DCI downlink control information
  • the method of Aspect 9 further includes that the downlink configuration further indicates a number of repetitions associated with the aperiodic channel measurement resources and a periodicity between the number of repetitions, the method further comprising obtaining L1 measurements of the aperiodic channel measurement resources based on the number of repetitions and the periodicity.
  • the method of Aspect 9 further includes obtaining L1 measurements of the aperiodic channel measurement resources for filtering based on a number of occasions following a start of one of the aperiodic channel measurement resources configured as a reference resource.
  • Aspect 12 is an apparatus for wireless communication, comprising the method of any of Aspects 1-11.
  • Aspect 13 is an apparatus for wireless communication, comprising means for performing the method of any of Aspects 1-11.
  • Aspect 14 is a non-transitory computer-readable medium storing computer-executable instructions that when executed by a processor of a network node cause the network node to perform the method of any of Aspects 1-11.
  • Aspect 15 is a method of wireless communication performed by a network entity, the method comprising transmitting, to a user equipment (UE) , a downlink configuration configuring the UE to report filtered Layer 1 (L1) measurements for an intra-frequency candidate cell or an inter-frequency candidate cell; and receiving, from the UE, an uplink report comprising the filtered L1 measurements of the intra-frequency candidate cell or the inter-frequency candidate cell.
  • UE user equipment
  • the method of Aspect 15 further includes that the downlink configuration indicates filtering coefficients for one or more channel state information (CSI) report configurations.
  • CSI channel state information
  • the method of any of Aspect 15 or Aspect 16 further includes that the downlink configuration indicates filtering coefficients that are fixed in value for one or more candidate cells.
  • the method of any of Aspects 15-17 further includes that the downlink configuration further configures the UE to obtain a configurable number of L1 measurements associated with one or more candidate cells.
  • any of Aspects 15-18 further comprising receiving, from the UE, a UE capability message indicating a first minimum time offset parameter and a second minimum time offset parameter, the first minimum time offset parameter indicating a first time offset between an end of a last resource of a downlink signal triggering L1 measurement reporting and a start of a first resource of the L1 measurement reporting, and the second minimum time offset parameter indicating a second time offset between an end of a last resource associated with a candidate cell and the start of the first resource of the L1 measurement reporting; and transmitting, to the UE, the downlink signal triggering the L1 measurement reporting at a first time that is offset from the end of the last resource associated with the candidate cell by a third time offset exceeding the first time offset, wherein the uplink report is received at a second time that is offset from the end of the last resource associated with the candidate cell by a fourth time offset exceeding the second time offset.
  • the method of any of Aspects 15-19 further includes that the downlink configuration further configures the UE to trigger L1 measurement reporting of aperiodic channel measurement resources by downlink control information (DCI) signaling.
  • DCI downlink control information
  • the method of Aspect 20 further includes that the downlink configuration further indicates a number of repetitions associated with the aperiodic channel measurement resources and a periodicity between the number of repetitions.
  • Aspect 22 is an apparatus for wireless communication, comprising the method of any of Aspects 15-21.
  • Aspect 23 is an apparatus for wireless communication, comprising means for performing the method of any of Aspects 15-21.
  • Aspect 24 is a non-transitory computer-readable medium storing computer-executable instructions that when executed by a processor of a network node cause the network node to perform the method of any of Aspects 15-21.
  • a phrase referring to “at least one of” a list of items refers to any combination of those items, including single members.
  • “at least one of: a, b, or c” is intended to cover: a, b, c, a-b, a-c, b-c, and a-b-c.
  • the hardware and data processing apparatus used to implement the various illustrative logics, logical blocks, modules and circuits described in connection with the aspects disclosed herein may be implemented or performed with a general purpose single-or multi-chip processor, a digital signal processor (DSP) , an application specific integrated circuit (ASIC) , a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein.
  • a general purpose processor may be a microprocessor, or any conventional processor, controller, microcontroller, or state machine.
  • a processor also may be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • particular processes and methods may be performed by circuitry that is specific to a given function.
  • the functions described may be implemented in hardware, digital electronic circuitry, computer software, firmware, including the structures disclosed in this specification and their structural equivalents thereof, or in any combination thereof. Implementations of the subject matter described in this specification also can be implemented as one or more computer programs, i.e., one or more modules of computer program instructions, encoded on a computer storage media for execution by, or to control the operation of, data processing apparatus.
  • Computer-readable media includes both computer storage media and communication media including any medium that can be enabled to transfer a computer program from one place to another.
  • a storage media may be any available media that may be accessed by a computer.
  • such computer-readable media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that may be used to store desired program code in the form of instructions or data structures and that may be accessed by a computer.
  • Disk and disc includes compact disc (CD) , laser disc, optical disc, digital versatile disc (DVD) , floppy disk, and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media. Additionally, the operations of a method or algorithm may reside as one or any combination or set of codes and instructions on a machine readable medium and computer-readable medium, which may be incorporated into a computer program product.

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Abstract

La présente divulgation propose des systèmes, des procédés et un appareil, y compris des programmes informatiques encodés sur des supports de stockage informatiques, qui permettent à un équipement utilisateur (UE) de faciliter une procédure de mobilité de couche 1 ou de couche 2. L'UE reçoit une configuration de liaison descendante configurant l'UE de sorte à rapporter des mesures de couche filtrée 1 pour une cellule candidate intra-fréquence ou une cellule candidate inter-fréquence. L'UE effectue une procédure de filtrage sur des mesures L1 de la cellule candidate intra-fréquence ou de la cellule candidate inter-fréquence, afin d'obtenir les mesures de couche 1 filtrées sur la base de la configuration de liaison descendante. L'UE transmet un rapport de liaison montante comprenant les mesures L1 filtrées de la cellule candidate intra-fréquence ou de la cellule candidate inter-fréquence.
PCT/CN2022/129430 2022-11-03 2022-11-03 Filtrage de mesures de couche 1 d'une cellule candidate pour une mobilité de couche 1 et de couche 2 Ceased WO2024092598A1 (fr)

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EP22963910.9A EP4612944A1 (fr) 2022-11-03 2022-11-03 Filtrage de mesures de couche 1 d'une cellule candidate pour une mobilité de couche 1 et de couche 2
CN202280101347.8A CN120113272A (zh) 2022-11-03 2022-11-03 对用于层1和层2移动性的候选小区的层1测量进行滤波
PCT/CN2022/129430 WO2024092598A1 (fr) 2022-11-03 2022-11-03 Filtrage de mesures de couche 1 d'une cellule candidate pour une mobilité de couche 1 et de couche 2
KR1020257011594A KR20250099330A (ko) 2022-11-03 2022-11-03 계층 1 및 계층 2 이동성을 위한 후보 셀의 계층 1 측정들의 필터링

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