WO2021244561A1 - Mécanisme pour éviter un crs lte provenant d'une cellule voisine en dss - Google Patents

Mécanisme pour éviter un crs lte provenant d'une cellule voisine en dss Download PDF

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WO2021244561A1
WO2021244561A1 PCT/CN2021/097831 CN2021097831W WO2021244561A1 WO 2021244561 A1 WO2021244561 A1 WO 2021244561A1 CN 2021097831 W CN2021097831 W CN 2021097831W WO 2021244561 A1 WO2021244561 A1 WO 2021244561A1
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lte
dss
cell
crs
cells
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PCT/CN2021/097831
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Yen-Chen Chen
Xiu-sheng LI
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Mediatek Inc.
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    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0006—Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio
    • 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
    • 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 signaling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI
    • 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
    • H04L5/0058—Allocation criteria
    • H04L5/0073—Allocation arrangements that take into account other cell interferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • 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
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1215—Wireless traffic scheduling for collaboration of different radio technologies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Definitions

  • the disclosed embodiments relate to mobile communication networks, and more specifically, to avoid LTE Cell-specific Reference Signal (CRS) from Neighboring Cell in Dynamic Spectrum Sharing (DSS) in next generation 5G new radio (NR) mobile communication networks.
  • CRS Cell-specific Reference Signal
  • DSS Dynamic Spectrum Sharing
  • NR next generation 5G new radio
  • LTE Long-Term Evolution
  • UMTS Universal Mobile Telecommunication System
  • E-UTRAN an evolved universal terrestrial radio access network
  • eNodeBs or eNBs evolved Node-Bs communicating with a plurality of mobile stations, referred as user equipments (UEs) .
  • UEs user equipments
  • 3GPP 3 rd generation partner project
  • 3GPP 3 rd generation partner project
  • the next generation mobile network (NGMN) board has decided to focus the future NGMN activities on defining the end-to-end requirements for 5G new radio (NR) systems.
  • the signal bandwidth for 5G NR system is estimated to increase to up to hundreds of MHz for below 6GHz bands and even to values of GHz in case of millimeter wave bands.
  • the 5G NR standard offers the possibility of adapting to existing LTE deployments and sharing the spectrum used by LTE. This enabling feature is called Dynamic Spectrum Sharing (DSS) , which is part of the overall mechanism that allows 5G NR and 4G LTE to coexist while utilizing the same frequency band.
  • DSS Dynamic Spectrum Sharing
  • the DSS concept is based on the flexible design of NR physical layer. It uses the idea that NR signals are transmitted over unused LTE resources. With LTE, all the channels are statically assigned in the time-frequency domain, whereas the NR physical layer is extremely flexible for reference signals, data and control channels, thus allowing dynamic configurations that will minimize a chance of collision between the two technologies.
  • the 5G physical layer is designed to be so similar to 4G that DSS becomes feasible.
  • the main foundation of DSS is to schedule NR users in the LTE subframes while ensuring no respective impact on LTE users in terms of essential channels, such as reference signals used for synchronization and downlink measurements.
  • LTE Cell Reference Signals (CRS) is typically the main concept where DSS options are designated, as CRS have a fixed time-frequency resource assignment. Since the NR network needs to maintain LTE CRS transmission, it creates one of the most significant interference sources. This is because LTE CRSs are transmitted by neighboring DSS cells across the entire frequency band even when downlink data traffic is not present.
  • 5G transmission is designed around LTE CRS in an approach called rate matching. In order to avoid interference from the collocated LTE CRS, rate-matching can be applied.
  • NR UEs do not have information of LTE CRSs from neighboring LTE cells, which causes interference and degrades UE reception performance.
  • a method of avoid interference from neighboring LTE cell-specific reference signal (CRS) in a mobile communication network with dynamic spectrum sharing (DSS) is proposed.
  • the network configures inter-RAT measurement objects to UE for intra-frequency LTE cell measurements.
  • the measurement objects include at least one of carrier frequency, cell ID, RSRP, RSRQ, and SINR.
  • UE performs intra-frequency measurements and reports measurement results of one or more LTE aggressor cells.
  • the network enables or activates rate matching and configures rate matching pattern for UE to avoid neighboring LTE CRS resource elements (REs) upon satisfying certain criterion.
  • REs resource elements
  • a UE receives measurement configuration in a 5G new radio (NR) mobile communication network with dynamic spectrum sharing (DSS) .
  • the UE receives both NR and LTE signals over a frequency band in a serving DSS cell.
  • the UE performs inter-Radio Access Technology (inter-RAT) measurements over the same frequency band from neighboring DSS cells based on the measurement configuration.
  • the UE reports measurement results of one or more LTE aggressor cells to the network.
  • the UE receives a rate matching (RM) pattern from the network to rate-match cell-specific reference signal (CRS) resource elements (REs) of the one or more LTE aggressor cells based on the reported measurement results.
  • RM rate matching
  • CRS cell-specific reference signal
  • a base station transmits measurement configuration to a user equipment (UE) in a 5G new radio (NR) mobile communication network with dynamic spectrum sharing (DSS) between NR and LTE over a frequency band.
  • the base station receives inter-Radio Access Technology (inter-RAT) measurement results for measurements performed by the UE over the same frequency bands from neighboring DSS cells.
  • the base station determines whether rate matching (RM) is to be triggered for the UE based on the measurement results of one or more LTE aggressor cells.
  • the base station transmits a rate matching pattern to the UE for rate-matching cell-specific reference signal (CRS) resource elements (REs) of the one or more LTE aggressor cells.
  • CRS cell-specific reference signal
  • Figure 1 illustrates a new radio (NR) mobile communication network (NW) with dynamic spectrum sharing (DSS) and rate matching (RAM) to avoid interference from LTE cell-specific reference signals (CRSs) in accordance with one novel aspect.
  • NR new radio
  • NW mobile communication network
  • DSS dynamic spectrum sharing
  • RAM rate matching
  • FIG. 2 illustrates simplified block diagrams of a base station and a user equipment (UE) in accordance with embodiments of the current invention.
  • Figure 3 illustrates examples of one resource block (RB) structure for both physical downlink control channel (PDCCH) and physical downlink shared channel (PDSCH) with LTE CRS transmission in DSS.
  • RB resource block
  • Figure 4 illustrates a sequence flow of a mechanism to avoid LTE CRS transmission from neighboring DSS cells in accordance with one novel aspect.
  • Figure 5 illustrates embodiments of criterion for activating RM and configuring RM patterns based on UE measurement results.
  • Figure 6 illustrates embodiments of RM mechanism with RE-level rate matching and symbol-level rate matching (RM) based on UE measurement results.
  • Figure 7 is a flow chart of a method of rate matching to avoid LTE CRS in DSS from UE perspective in accordance with one novel aspect.
  • Figure 8 is a flow chart of a method of rate matching to avoid LTE CRS in DSS from NW perspective in accordance with one novel aspect.
  • FIG. 1 illustrates a new radio (NR) mobile communication network (NW) 100 with dynamic spectrum sharing (DSS) and rate matching (RAM) to avoid interference from LTE cell-specific reference signals (CRSs) in accordance with one novel aspect.
  • Mobile communication network 100 is a 5G NR system having a first base station BS 102, a second base station BS 103, and a user equipment UE 101.
  • DSS dynamic spectrum sharing
  • the neighboring BS 103 can be either 5G and/or 4G base station (gNB+eNB) or pure eNB.
  • a neighboring DSS cell 130 refers to 5G+LTE cell or pure LTE cell.
  • DSS allows resources to be shared dynamically between 4G and 5G in time and/or frequency domains.
  • the main foundation of DSS is to schedule NR users in the LTE subframes while ensuring no respective impact on LTE users in terms of essential channels, such as reference signals (RSs) used for synchronization and downlink measurements.
  • RSs reference signals
  • LTE Cell Reference Signal is typically the main concept where DSS options are designated, as CRSs have a fixed time-frequency resource assignment.
  • LTE CRSs are transmitted by neighboring DSS cells across the entire frequency band even when downlink data traffic is not present.
  • 5G transmission is designed around LTE CRS in an approach called rate matching (RM) .
  • rate matching means that bits in certain location on a data channel are repeated or punctured.
  • UE performs puncturing of resource elements (REs) in those location used by LTE CRS so that NR scheduler knows which REs are not available for NR data scheduling over physical downlink shared channel (PDSCH) .
  • PDSCH physical downlink shared channel
  • NR UEs do not have information of LTE CRSs from neighboring LTE cells, which causes interference and degrades UE reception performance.
  • UE 101 is served by its serving base station gNB 102 in a serving DSS cell over a frequency band.
  • UE 101 performs radio signal measurements from its serving cell (e.g., serving DSS cell 110) , co-located cell (e.g., co-located cell 120) , and neighboring DSS cells (e.g., neighboring DSS cell 130) and reports measurement results to the network based on measurement configuration.
  • UE 101 receives LTE CRS transmission from co-collocated LTE cell 120 and from neighboring DSS cell 120.
  • the CRS transmission from co-located DSS cell 120 is known by the serving gNB 102, thus can be treated as overhead and rate-matched.
  • the CRS transmission from neighboring DSS cell 130 causes interference, since NR UE 101 does not have information of the LTE CRS from neighboring DSS cells. As a result, the LTE CRS from neighbor DSS cells degrades UE reception performance.
  • the network enables or activates rate matching and configures RM pattern for the UE to avoid neighboring LTE CRS upon satisfying certain criterion in DSS.
  • the idea is that the NR gNB can configure measurement objects to help UE to find neighboring DSS cells and find their LTE CRS RE location.
  • the NR gNB determines when and how to configure/enable rate-match pattern to avoid the interference from neighboring DSS cell with neighboring DSS cell measurement from UE or/and with UE’s location info.
  • NW knows UE capable to use “overlapping CRS rate-match (RM) pattern, ” which is specified for M-TRP scenario, to avoid neighboring LTE CRS even under non-M-TRP scenario.
  • RM channel state information
  • any kind of channel state information (CSI) -RS resources can be used as CRS rate-match pattern, e.g., ZP-CSI-RS, NZP-CSI-RS, CSI-IM.
  • any kind of RM resources can be used as CRS rate-match pattern, e.g., RateMatchPattern, lte-CRS-PatternList2-r16, lte-CRS-PatternList3, Symbol-RB-level RM.
  • gNB 102 configures inter-RAT measurement objects to UE 101 for intra-frequency DSS cell measurements.
  • UE 101 performs intra-frequency measurements and reports measurement results of one or more LTE aggressor cells.
  • the measurement results may comprise the carrier frequency, the cell ID, and radio signal power and quality of the being measured neighboring DSS cells.
  • gNB 102 upon satisfying certain RM criterion, gNB 102 enables or activates RM, and configures RM pattern to UE 101 to rate-match CRS REs of the reported LTE aggressor cell based on UE’s measurement reports.
  • gNB 102 can determine the corresponding RM pattern to rate-match CRS REs of LTE aggressor cell 130.
  • the configuration of the RM pattern (and enabling or activating RM) can be done in semi-statically (via radio resource control (RRC) layer) , semi-persistently (via MAC layer) , or dynamically (via PHY layer) .
  • RRC radio resource control
  • FIG. 2 illustrates simplified block diagrams of wireless devices, e.g., a UE 201 and base station gNB 211 in accordance with embodiments of the current invention.
  • gNB 211 has an antenna 215, which transmits and receives radio signals.
  • a radio frequency RF transceiver module 214 coupled with the antenna, receives RF signals from antenna 215, converts them to baseband signals and sends them to a processor 213.
  • RF transceiver 214 also converts received baseband signals from processor 213, converts them to RF signals, and sends out to antenna 215.
  • Processor 213 processes the received baseband signals and invokes different functional modules and circuits to perform features in BS 211.
  • Memory 212 stores program instructions and data 220 to control the operations of BS 211.
  • gNB 211 also includes protocol stack 280 and a set of control functional modules and circuitry 290.
  • Scheduler 231 schedules DL and UL data transmission for UE under CA.
  • Rate matching handling circuit 232 handles rate matching enabling or activation and RM pattern configuration.
  • Configuration and control circuit 233 provides different parameters to configure and control functionalities of UE.
  • UE 201 has memory 202, a processor 203, and radio frequency (RF) transceiver module 204.
  • RF transceiver 204 is coupled with antenna 205, receives RF signals from antenna 205, converts them to baseband signals, and sends them to processor 203.
  • RF transceiver 204 also converts received baseband signals from processor 203, converts them to RF signals, and sends out to antenna 205.
  • Processor 203 processes the received baseband signals and invokes different functional modules and circuitry to perform features in UE 201.
  • Memory 202 stores data and program instructions 210 to be executed by the processor to control the operations of UE 201.
  • Suitable processors include, by way of example, a special purpose processor, a digital signal processor (DSP) , a plurality of micro-processors, one or more micro-processor associated with a DSP core, a controller, a microcontroller, application specific integrated circuits (ASICs) , file programmable gate array (FPGA) circuits, and other type of integrated circuits (ICs) , and/or state machines.
  • DSP digital signal processor
  • ASICs application specific integrated circuits
  • FPGA file programmable gate array
  • ICs integrated circuits
  • UE 201 also comprises a set of functional modules and control circuitry to carry out functional tasks of UE 201.
  • Protocol stacks 260 comprise Non-Access-Stratum (NAS) layer, Radio Resource Control (RRC) layer for high layer configuration and control, Packet Data Convergence Protocol/Radio Link Control (PDCP/RLC) layer, Media Access Control (MAC) layer, and Physical (PHY) layer.
  • System modules and circuitry 270 may be implemented and configured by software, firmware, hardware, and/or combination thereof. The function modules and circuitry, when executed by the processors via program instructions contained in the memory, interwork with each other to allow UE 201 to perform embodiments and functional tasks and features in the network.
  • system modules and circuitry 270 comprise a measurement circuitry 221 that performs measurements, a measurement reporting circuitry 222 that reports measurement results, and a config and control circuitry 223 that handles measurement configuration, rate matching activation, and RM pattern configuration to rate match LTE CRS under DSS.
  • FIG. 3 illustrates examples of one resource block (RB) structure for both physical downlink control channel (PDCCH) and physical downlink shared channel (PDSCH) with LTE CRS transmission in DSS.
  • OFDM Orthogonal Frequency Division Multiplexing
  • resource allocation is based on a regular time-frequency grid. OFDM symbols with the same numerology are allocated across the whole time-frequency grid. Cyclic Prefix (CP) is added to each OFDM symbol to avoid inter symbol interference (ISI) . Reference signals are located at pre-defined locations within the time-frequency grid to enable channel estimation.
  • OFDM downlink (DL) the DL data is scheduled by PDCCH and transmitted over PDSCH.
  • Multiple access in OFDM downlink is achieved by assigning different sub-bands (i.e., groups of subcarriers, denoted as resource blocks (RBs) ) of the system bandwidth to individual UEs based on their existing channel condition.
  • resource blocks i.e., groups of subcarriers, denoted as resource blocks (RBs)
  • an OFDM radio frame consists of a number of subframes and slots, each slot contains a fixed number of 14 OFDM symbols.
  • the basic unit of the resource grid is called Resource Element (RE) , which spans an OFDMA subcarrier over one OFDMA symbol.
  • One RB structure occupies one slot in time domain and twelve subcarriers in frequency domain.
  • an NR UE receives downlink data over PDSCH 320 scheduled by PDCCH 310 in its serving DSS cell.
  • the UE also receives CRS transmission from co-located LTE cell (as depicted by solid squares) and from neighboring LTE cell (as depicted by dashed squares) .
  • co-located LTE CRS the corresponding RE locations are rate-matched by the network, e.g., those REs are not available for NR data scheduling over PDSCH 320.
  • neighboring LTE CRS the network does not have information of the corresponding RE locations.
  • the network enables or activates rate matching for neighboring LTE CRS as well, upon detecting certain triggering conditions are satisfied. Specifically, the network configures measurement objects to help UE to find neighboring LTE aggressor cells, determines RM pattern based on UE measurement report, and then configures the RM pattern to UE to rate match CRS REs of the LTE aggressor cells.
  • FIG. 4 illustrates a sequence flow of a mechanism to avoid LTE CRS transmission from neighboring DSS cells in accordance with one novel aspect.
  • a serving base station in a DSS mobile network provides measurement configuration to UE 401.
  • the measurement configuration comprises measurement objects including at least one of a carrier frequency (EARFCN) , a cell ID (PCI) , a reference signal received power (RSRP, 1dB granularity) , a reference signal received quality (RSRQ, 0.5 dB granularity) , and a signal to interference plus noise ratio (SINR, 0.5dB granularity) .
  • UE 401 receives radio signals from serving DSS cell, and from other collocated and neighboring DSS cells.
  • UE 401 performs measurements based on the measurement configuration accordingly.
  • UE 401 sends measurement report to its serving base station.
  • the measurement report includes the measured objects of one or more LTE aggressor cells, including the cell ID of the LTE aggressor cells.
  • the serving base station determines whether to activate or enable rate matching based on the measurement results and/or UE location, and also determines the corresponding RM pattern.
  • rate matching is triggered only if certain predefined criterion are met.
  • the CRS is transmitted on certain RE locations with a predefined pattern (v-shift) .
  • the CRS pattern can be determined based on its cell ID provided in the measurement results.
  • the serving base station can determined the RM pattern for rate matching, e.g., not to schedule DL data in those RE locations in PDSCH.
  • the serving base station sends the RM pattern to UE 401.
  • UE 401 performs rate matching accordingly, e.g., puncturing the REs based on the RM pattern.
  • FIG. 5 illustrates embodiments of criterion for activating RM and configuring RM patterns based on UE measurement results.
  • Mobile communication network 500 comprises a first serving base station gNB 501, a second neighboring base station gNB/eNB 502, and UE 503.
  • DSS dynamic spectrum sharing
  • UE 503 receives LTE CRS transmission from co-collocated LTE cell and from neighboring DSS cell over the same frequency band.
  • the LTE CRS transmission from neighboring DSS cells causes interference, since NR UE 503 does not have information of the LTE CRS from neighboring DSS cells. As a result, the LTE CRS transmitted from neighbor DSS cells degrades UE reception performance.
  • the network/gNB 501 enables or activates rate matching and configures RM pattern for UE to avoid neighboring LTE CRS interference upon satisfying certain criterion in DSS.
  • serving gNB 101 configures inter-RAT measurement objects to UE 503 for intra-frequency DSS cell measurements.
  • Inter-RAT means that the measurement objects are for both NR cells and for LTE cells.
  • Intra-frequency means that the measurements are performed over the same frequency band for both NR cells and for LTE cells.
  • the configured measurement objects includes at least one of a carrier frequency (EARFCN) , a cell ID (PCI) , a reference signal received power (RSRP, 1dB granularity) , a reference signal received quality (RSRQ, 0.5 dB granularity) , and a signal to interference plus noise ratio (SINR, 0.5dB granularity) .
  • a carrier frequency EHF
  • PCI cell ID
  • RSRP reference signal received power
  • RSRQ reference signal received quality
  • SINR signal to interference plus noise ratio
  • UE 503 performs intra-frequency measurements and reports measurement results of one or more LTE aggressor cells to gNB 501.
  • the measurement results may comprise the carrier frequency, the cell ID, RSRP, RSRQ, and SINR of the being measured neighboring DSS cells, e.g., neighboring DSS cell 520 served by gNB/eNB 502.
  • the network can decide whether to trigger rate matching for UE 503.
  • a first criterion is whether the UE operates under DSS carrier or not. This can be determined based on DSS carrier LUT or on the RRC IE, lte-CRS-ToMatchAround including LTE EARFCN.
  • a second criterion is based on the UE’s serving cell and/or neighboring DSS cell RSRP/RSRQ measurement report, e.g., to identify whether interference due to CRS transmission is large or not. If interference is large, then it is desired to trigger RM to prevent such interference.
  • a third criterion is based on how many neighboring DSS cells UE observes, as different v-shift (derived from PCI) requires different RM pattern. If there are more LTE aggressor cells, then it is more likely to trigger RM.
  • a fourth criterion is based on UE’s location, e.g., whether UE is in cell edge or sector edge so that rate matching is desired.
  • UE location
  • UE 503 when UE 503 is at location A, there is no need for RM, but when UE 503 moves to location B, there RM can be triggered.
  • the UE location can be derived through uplink (UL) signal power and angle of arrival.
  • gNB 501 upon satisfying certain RM criterion, gNB 501 enables or activates RM, and configures RM pattern to UE 503 to rate-match CRS REs of the reported LTE aggressor cell based on UE’s measurement reports.
  • gNB 501 can determine the corresponding RM pattern to rate-match CRS REs of LTE aggressor cell.
  • many ZP-CSI-RSs (already defined in R15) can be used to fit CRS pattern.
  • RateMatchPattern (already defined in R15) can be used.
  • lte-CRS-PatternList2-r16 (or “overlapping CRS pattern” specified in R16) can be used. Although this is defined only for M-TRP, with UE capability reporting, the network may ignore spec constraint and use the RM pattern. Such restriction in spec may also be removed in the future.
  • new RM pattern design at least to add in spec one more “overlapping CRS pattern” , ex: lte-CRS-PatternList3 can be used, so that two neighboring DSS cells with different v-shift can be handled. Note that the lte-CRS-PatternList3 RM pattern is just provided as one example of a newly added RM pattern, and the RM pattern name can be different from lte-CRS-PatternList3.
  • the configuration of the RM pattern can be done in semi-statically (via radio resource control (RRC) layer using RRC signaling) , semi-persistently (via MAC layer using MAC CE) , or dynamically (via PHY layer using L1 signaling such as DCI) .
  • RRC radio resource control
  • ZP-CSI-RS supports semi-static/semi-persistent/dynamic manner
  • RateMatchPattern supports semi-static/dynamic manner
  • lte-CRS-PatternList2-r16 supports semi-static/dynamic manner for M-TRP usage.
  • semi-static/semi-persistent/dynamic manner of lte-CRS-PatternList2-r16/lte-CRS-PatternList3 can be introduced.
  • Figure 6 illustrates embodiments of RM mechanism with RE-level rate matching and symbol-level rate matching (RM) based on UE measurement results.
  • the implementation of rate matching can be either symbol-level when the whole OFDM symbol containing LTE CRS is taken out of NR scheduling, or RE-level where NR PDSCH scheduling avoids particular REs only.
  • the end result of rate matching is that the scheduler will reduce the NR PDSCH transport block size as the number of REs available for scheduling become less in a slot.
  • RE-level RM can be applied.
  • use ZP-CSI-RS to cover CRS RE from the LTE aggressor cell, this is feasible although many ZP-CSI-RS resources are required.
  • symbol-level RM can be applied.
  • use RateMatchPattern to rate match the whole OFDM symbol with LTE CRS.
  • FIG. 7 is a flow chart of a method of rate matching to avoid LTE CRS in DSS from UE perspective in accordance with one novel aspect.
  • a UE receives measurement configuration in a 5G new radio (NR) mobile communication network with dynamic spectrum sharing (DSS) .
  • the UE receives both NR and LTE signals over a frequency band in a serving DSS cell.
  • the UE performs inter-Radio Access Technology (inter-RAT) measurements over the same frequency band from neighboring DSS cells based on the measurement configuration.
  • the UE reports measurement results of one or more LTE aggressor cells to the network.
  • the UE receives a rate matching (RM) pattern from the network to rate-match cell-specific reference signal (CRS) resource elements (REs) of the one or more LTE aggressor cells based on the reported measurement results.
  • RM rate matching
  • CRS cell-specific reference signal
  • FIG. 8 is a flow chart of a method of rate matching to avoid LTE CRS in DSS from NW perspective in accordance with one novel aspect.
  • a base station transmits measurement configuration to a user equipment (UE) in a 5G new radio (NR) mobile communication network with dynamic spectrum sharing (DSS) between NR and LTE over a frequency band.
  • the base station receives inter-Radio Access Technology (inter-RAT) measurement results for measurements performed by the UE over the same frequency bands from neighboring DSS cells.
  • the base station determines whether rate matching (RM) is to be triggered for the UE based on the measurement results of one or more LTE aggressor cells.
  • the base station transmits a rate matching pattern to the UE for rate-matching cell-specific reference signal (CRS) resource elements (REs) of the one or more LTE aggressor cells.
  • CRS cell-specific reference signal

Abstract

L'invention concerne un procédé destiné à éviter un brouillage dû à un signal de référence (CRS) spécifique à une cellule LTE voisine dans un réseau de communication mobile avec partage dynamique de spectre (DSS). Premièrement, le réseau configure des objets de mesure inter-RAT pour un UE en vue de mesures intra-fréquence de cellule LTE. Les objets de mesure comprennent au moins un élément parmi une fréquence porteuse, un ID de cellule, un RSRP, un RSRQ et un SINR. Deuxièmement, l'UE effectue des mesures intra-fréquence et rend compte de résultats de mesures d'une ou plusieurs cellules LTE brouilleuses. Troisièmement, le réseau autorise ou active une adaptation de débit et configure un diagramme d'adaptation de débit pour l'UE de façon à éviter des CRS d'éléments de ressources (RE) LTE voisins lorsqu'un certain critère est satisfait.
PCT/CN2021/097831 2020-06-02 2021-06-02 Mécanisme pour éviter un crs lte provenant d'une cellule voisine en dss WO2021244561A1 (fr)

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WO2022212997A1 (fr) * 2021-03-31 2022-10-06 Qualcomm Incorporated Techniques d'annulation d'interférence de signal de référence ou d'adaptation de débit
CN115460701A (zh) * 2022-08-16 2022-12-09 中国电信股份有限公司 基于规避干扰的速率匹配方法、装置、设备及存储介质
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US11871277B2 (en) * 2021-06-09 2024-01-09 Qualcomm Incorporated Dynamic rate matching patterns for spectrum sharing
WO2024013551A1 (fr) * 2022-07-14 2024-01-18 Telefonaktiebolaget Lm Ericsson (Publ) Blocage commandé de crs lte pour partage de spectre
US11895690B2 (en) 2021-03-31 2024-02-06 Qualcomm Incorporated Techniques for reference signal interference canceling or rate matching

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Publication number Priority date Publication date Assignee Title
WO2022212997A1 (fr) * 2021-03-31 2022-10-06 Qualcomm Incorporated Techniques d'annulation d'interférence de signal de référence ou d'adaptation de débit
US11895690B2 (en) 2021-03-31 2024-02-06 Qualcomm Incorporated Techniques for reference signal interference canceling or rate matching
US11871277B2 (en) * 2021-06-09 2024-01-09 Qualcomm Incorporated Dynamic rate matching patterns for spectrum sharing
CN114362906A (zh) * 2021-12-31 2022-04-15 中国电信股份有限公司 速率匹配方法、装置、电子设备和可读介质
WO2023244145A1 (fr) * 2022-06-15 2023-12-21 Telefonaktiebolaget Lm Ericsson (Publ) Procédé et appareil d'adaptation de débit adaptative
WO2024013551A1 (fr) * 2022-07-14 2024-01-18 Telefonaktiebolaget Lm Ericsson (Publ) Blocage commandé de crs lte pour partage de spectre
CN115460701A (zh) * 2022-08-16 2022-12-09 中国电信股份有限公司 基于规避干扰的速率匹配方法、装置、设备及存储介质

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