WO2022215123A1 - 端末、無線通信方法及び基地局 - Google Patents
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- H—ELECTRICITY
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- H04W36/0005—Control or signalling for completing the hand-off
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W36/0055—Transmission or use of information for re-establishing the radio link
Definitions
- the present disclosure relates to terminals, wireless communication methods, and base stations in next-generation mobile communication systems.
- LTE Long Term Evolution
- 3GPP Rel. 10-14 LTE-Advanced (3GPP Rel. 10-14) has been specified for the purpose of further increasing the capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).
- LTE successor systems for example, 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later
- 5G 5th generation mobile communication system
- 5G+ 5th generation mobile communication system
- 6G 6th generation mobile communication system
- NR New Radio
- Layer1/layer2 (L1/L2) inter-cell mobility to facilitate more efficient (lower delay and overhead) DL/UL beam management in future wireless communication systems It is
- L1/L2 inter-cell mobility it is possible to change the serving cell using functions such as beam control without reconfiguring Radio Resource Control (RRC). In other words, it is possible to transmit to and receive from non-serving cells without handover.
- RRC Radio Resource Control
- L1/L2 inter-cell mobility that does not require handover is preferable because there is a period during which data communication is not possible, such as the need for RRC reconnection for handover.
- the question is how to control the transmission or reception of channels/signals transmitted from the same cell/TRP or from different cells/TRPs. becomes. If channels/signals transmitted from the same cell/TRP or from different cells/TRPs are not properly transmitted and received, the throughput or communication quality may deteriorate.
- one object of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately transmit or receive multiple channels/signals from cells including non-serving cells.
- a terminal is a receiving unit that receives configuration of a specific index indicating a serving cell and a non-serving cell, different from the physical cell ID, created based on a physical cell ID, and a configured and a control unit that controls transmission of the channel state information report corresponding to the specific index.
- transmission or reception of multiple channels/signals from cells including non-serving cells can be suitably performed.
- FIG. 1A and 1B are diagrams illustrating examples of TCI state settings.
- 2A and 2B are diagrams illustrating examples of inter-cell mobility.
- FIG. 3 is a diagram illustrating an example of a CSI report including information indicating serving/non-serving cells.
- FIG. 4 is a diagram showing a first example of the relationship between the serving cell/non-serving cell index or PCI and the new ID.
- FIG. 5 is a diagram illustrating a second example of the relationship between the serving cell/non-serving cell index or PCI and the new ID.
- FIG. 6 is a diagram illustrating an example of how to set the relationship between the serving cell/non-serving cell index or PCI and the new ID.
- FIG. 7 is a diagram illustrating an example of a schematic configuration of a radio communication system according to an embodiment.
- FIG. 8 is a diagram illustrating an example of the configuration of a base station according to one embodiment.
- FIG. 9 is a diagram illustrating an example of the configuration of a user terminal according to one embodiment.
- FIG. 10 is a diagram illustrating an example of hardware configurations of a base station and a user terminal according to one embodiment.
- the UE measures the channel state using a predetermined reference signal (or resource for the reference signal) and feeds back (reports) channel state information (CSI) to the base station.
- CSI channel state information
- channel state information reference signal Channel State Information-Reference Signal: CSI-RS
- CSI-RS Channel State Information-Reference Signal
- SS Physical Broadcast Channel
- SS synchronization signal
- DMRS DeModulation Reference Signal
- the CSI-RS resource may include at least one of Non Zero Power (NZP) CSI-RS and CSI-Interference Management (IM).
- the SS/PBCH block is a block containing synchronization signals (e.g., Primary Synchronization Signal (PSS), Secondary Synchronization Signal (SSS)) and PBCH (and corresponding DMRS), and the SS block ( SSB) or the like.
- An SSB index may be given for the temporal position of the SSB within the half-frame.
- CSI includes Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), CSI-RS Resource Indicator (CRI), SS/PBCH block resource indicator ( SS/PBCH Block Indicator: SSBRI), Layer Indicator: LI, Rank Indicator: RI, Layer 1 (L1) - Reference Signal Received Power (RSRP) (reference signal received power in Layer 1), At least one of L1-Reference Signal Received Quality (RSRQ), L1-Signal to Interference plus Noise Ratio (SINR), L1-Signal to Noise Ratio (SNR), etc. may be included.
- CQI Channel Quality Indicator
- PMI Precoding Matrix Indicator
- CRI CSI-RS Resource Indicator
- SS/PBCH Block Indicator SSBRI
- Layer Indicator: LI Layer Indicator: LI
- Rank Indicator: RI Layer 1 (L1) - Reference Signal Received Power (RSRP) (reference signal
- CSI may have multiple parts.
- a first part of CSI may contain information with a relatively small number of bits (eg, RI).
- a second part of CSI (CSI part 2) may include information with a relatively large number of bits (eg, CQI), such as information determined based on CSI part 1.
- Period CSI Period CSI: P-CSI
- Aperiodic CSI A (AP)-CSI
- semi-permanent Targeted Semi-persistent, semi-persistent CSI: SP-CSI
- the UE notifies information on CSI reporting (may be called CSI report configuration information) using higher layer signaling, physical layer signaling (for example, downlink control information (DCI)) or a combination thereof.
- CSI report configuration information may be configured using, for example, the RRC information element "CSI-ReportConfig".
- the higher layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.
- RRC Radio Resource Control
- MAC Medium Access Control
- MAC CE MAC Control Element
- MAC PDU MAC Protocol Data Unit
- Broadcast information includes, for example, Master Information Block (MIB), System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information : OSI).
- MIB Master Information Block
- SIB System Information Block
- RMSI Remaining Minimum System Information
- OSI OSI
- the CSI report configuration information may include, for example, information on the reporting period, offset, etc., and these may be expressed in predetermined time units (slot units, subframe units, symbol units, etc.).
- the CSI report configuration information may include a configuration ID (CSI-ReportConfigId). Parameters such as the type of CSI reporting method (SP-CSI or not, etc.) and reporting cycle may be specified by the configuration ID.
- the CSI reporting configuration information may include information (CSI-ResourceConfigId) indicating which signal (or resource for which signal) is used to report the measured CSI.
- Beam management So far, in Rel-15 NR, a method of beam management (BM) has been studied. In the beam management, it is considered to perform beam selection based on the L1-RSRP reported by the UE. Changing (switching) the beam of a signal/channel may correspond to changing the (Transmission Configuration Indication state) of that signal/channel.
- the beam selected by beam selection may be a transmission beam (Tx beam) or a reception beam (Rx beam). Also, the beam selected by beam selection may be a UE beam or a base station beam.
- the UE may report (transmit) measurement results for beam management using PUCCH or PUSCH.
- the measurement result may be, for example, CSI including at least one of L1-RSRP, L1-RSRQ, L1-SINR, L1-SNR, and the like.
- the measurement result may be called a beam measurement, a beam measurement result, a beam report, a beam measurement report, or the like.
- CSI measurements for beam reporting may include interferometric measurements.
- the UE may use resources for CSI measurement to measure channel quality, interference, etc. and derive beam reports.
- the resource for CSI measurement may be, for example, at least one of SS/PBCH block resources, CSI-RS resources, other reference signal resources, and the like.
- the CSI measurement report configuration information may be configured in the UE using higher layer signaling.
- a beam report may include the result of at least one of channel quality measurement and interference measurement.
- the results of channel quality measurements may include, for example, L1-RSRP.
- the results of the interference measurements may include L1-SINR, L1-SNR, L1-RSRQ, other indicators of interference (eg, any indicator that is not L1-RSRP), and the like.
- the CSI measurement resource for beam management may be called a beam measurement resource.
- the CSI measurement target signal/channel may be referred to as a beam measurement signal.
- CSI measurement/report may be read as at least one of measurement/report for beam management, beam measurement/report, radio link quality measurement/report, and the like.
- the CSI report configuration information that considers the current NR beam management is included in the RRC information element "CSI-ReportConfig".
- the information in the RRC information element "CSI-ReportConfig" will be explained.
- the CSI report configuration information may include report amount information ("report amount”, which may be represented by the RRC parameter "reportQuantity”), which is information on parameters to report.
- the reporting volume information is the ASN. 1 object type. Therefore, one of the parameters (cri-RSRP, ssb-Index-RSRP, etc.) defined as the report amount information is set.
- a UE in which a higher layer parameter (eg, RRC parameter "groupBasedBeamReporting") included in the CSI reporting configuration information is set to enabled has multiple beam measurement resource IDs (eg, SSBRI, CRI) for each reporting configuration. , and their corresponding measurements (eg, L1-RSRP) may be included in the beam report.
- a higher layer parameter eg, RRC parameter "groupBasedBeamReporting”
- RRC parameter "groupBasedBeamReporting” included in the CSI reporting configuration information has multiple beam measurement resource IDs (eg, SSBRI, CRI) for each reporting configuration. , and their corresponding measurements (eg, L1-RSRP) may be included in the beam report.
- a UE for which the number of RS resources to be reported is set to one or more by a higher layer parameter (for example, the RRC parameter "nrofReportedRS") included in the CSI report configuration information is one or more beam measurement resources for each report configuration.
- the IDs and their corresponding one or more measurements may be included in the beam report.
- the reception processing e.g., reception, demapping, demodulation, decoding
- transmission processing e.g, at least one of transmission, mapping, precoding, modulation, encoding
- the TCI state may represent those that apply to downlink signals/channels.
- the equivalent of TCI conditions applied to uplink signals/channels may be expressed as spatial relations.
- the TCI state is information about the pseudo-colocation (QCL) of signals/channels, and may be called spatial reception parameters, spatial relation information, or the like.
- the TCI state may be set in the UE on a channel-by-channel or signal-by-signal basis.
- QCL is an index that indicates the statistical properties of a signal/channel. For example, when one signal/channel and another signal/channel have a QCL relationship, Doppler shift, Doppler spread, average delay ), delay spread, spatial parameters (e.g., spatial Rx parameter) are identical (QCL with respect to at least one of these). You may
- the spatial reception parameters may correspond to the reception beams of the UE (eg, reception analog beams), and the beams may be specified based on the spatial QCL.
- QCL or at least one element of QCL in the present disclosure may be read as sQCL (spatial QCL).
- QCL types may be defined for the QCL.
- QCL types AD may be provided with different parameters (or parameter sets) that can be assumed to be the same, and the parameters (which may be called QCL parameters) are shown below: QCL type A (QCL-A): Doppler shift, Doppler spread, mean delay and delay spread, QCL type B (QCL-B): Doppler shift and Doppler spread, QCL type C (QCL-C): Doppler shift and mean delay; • QCL Type D (QCL-D): Spatial reception parameters.
- the UE cannot assume that a given Control Resource Set (CORESET), channel or reference signal is in a specific QCL (e.g. QCL type D) relationship with another CORESET, channel or reference signal. , may be called the QCL assumption.
- CORESET Control Resource Set
- QCL QCL type D
- a UE may determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) for a signal/channel based on the TCI conditions or QCL assumptions of that signal/channel.
- Tx beam transmit beam
- Rx beam receive beam
- the TCI state may be, for example, information about the QCL between the channel of interest (in other words, the reference signal (RS) for the channel) and another signal (for example, another RS). .
- the TCI state may be set (indicated) by higher layer signaling, physical layer signaling or a combination thereof.
- higher layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.
- RRC Radio Resource Control
- MAC Medium Access Control
- Broadcast information includes, for example, Master Information Block (MIB), System Information Block (SIB), Remaining Minimum System Information (RMSI), and other system information ( It may be Other System Information (OSI).
- MIB Master Information Block
- SIB System Information Block
- RMSI Remaining Minimum System Information
- OSI System Information
- Physical layer signaling may be, for example, downlink control information (DCI).
- DCI downlink control information
- Channels for which TCI states or spatial relationships are set are, for example, Physical Downlink Shared Channel (PDSCH), Physical Downlink Control Channel (PDCCH), Physical Uplink Shared Channel It may be at least one of a channel (PUSCH)) and an uplink control channel (Physical Uplink Control Channel (PUCCH)).
- PDSCH Physical Downlink Shared Channel
- PDCCH Physical Uplink Control Channel
- RSs that have a QCL relationship with the channel are, for example, a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), a measurement reference signal (Sounding It may be at least one of a reference signal (SRS)), a tracking CSI-RS (also called a tracking reference signal (TRS)), and a QCL detection reference signal (also called a QRS).
- SSB synchronization signal block
- CSI-RS channel state information reference signal
- Sounding It may be at least one of a reference signal (SRS)), a tracking CSI-RS (also called a tracking reference signal (TRS)), and a QCL detection reference signal (also called a QRS).
- SRS reference signal
- TRS tracking reference signal
- QRS QCL detection reference signal
- An SSB is a signal block that includes at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- PBCH Physical Broadcast Channel
- An SSB may also be called an SS/PBCH block.
- the TCI state information element (“TCI-state IE" of RRC) set by higher layer signaling may contain one or more pieces of QCL information ("QCL-Info").
- the QCL information may include at least one of information (RS related information) regarding RSs that are QCL related and information indicating the QCL type (QCL type information).
- the RS related information includes the index of the RS (eg, SSB index, Non-Zero-Power (NZP) CSI-RS resource ID (Identifier)), the index of the cell in which the RS is located, and the location of the RS. It may contain information such as the Bandwidth Part (BWP) index.
- BWP Bandwidth Part
- both QCL type A RS and QCL type D RS or only QCL type A RS can be configured for the UE as at least one TCI state of PDCCH and PDSCH.
- a TRS When a TRS is set as a QCL type A RS, the TRS is different from the PDCCH or PDSCH demodulation reference signal (DeModulation Reference Signal (DMRS)), and it is assumed that the same TRS will be transmitted periodically over a long period of time. be done.
- DMRS DeModulation Reference Signal
- the UE can measure the TRS and calculate the average delay, delay spread, etc.
- a UE configured with the TRS as a QCL type A RS in a PDCCH or PDSCH DMRS TCI state has the same QCL type A parameters (average delay, delay spread, etc.) of the PDCCH or PDSCH DMRS and the TRS. Therefore, the DMRS type A parameters (average delay, delay spread, etc.) of the PDCCH or PDSCH can be obtained from the TRS measurement results.
- the UE can use the TRS measurement result to perform more accurate channel estimation.
- a UE configured with a QCL type D RS can use the QCL type D RS to determine the UE receive beam (spatial domain receive filter, UE spatial domain receive filter).
- a QCL type X RS in a TCI state may mean an RS that has a QCL type X relationship with (the DMRS of) a certain channel/signal, and this RS is called a QCL type X QCL source in that TCI state.
- the unified TCI framework allows UL and DL channels to be controlled by a common framework.
- the unified TCI framework is Rel. Instead of defining TCI conditions or spatial relationships per channel as in 15, a common beam (common TCI condition) may be indicated and applied to all channels in the UL and DL, or for the UL A common beam may be applied to all channels in the UL and a common beam for the DL may be applied to all channels in the DL.
- One common beam for both DL and UL, or a common beam for DL and a common beam for UL (two common beams in total) are being considered.
- the UE may assume the same TCI state (joint TCI state, joint TCI pool, joint common TCI pool) for UL and DL.
- the UE assumes different TCI states for each of UL and DL (separate TCI state, separate TCI pool, UL separate TCI pool and DL separate TCI pool, separate common TCI pool, UL common TCI pool and DL common TCI pool).
- the UL and DL default beams may be aligned by MAC CE-based beam management (MAC CE level beam designation).
- the PDSCH default TCI state may be updated to match the default UL beam (spatial relationship).
- DCI-based beam management may indicate common beam/unified TCI state from the same TCI pool for both UL and DL (joint common TCI pool, joint TCI pool, set).
- M (>1) TCI states may be activated by MAC CE.
- the UL/DL DCI may select 1 out of M active TCI states.
- the selected TCI state may apply to both UL and DL channels/RS.
- the TCI pool (set) may be a plurality of TCI states set by RRC parameters, or a plurality of TCI states activated by MAC CE (active TCI state, active TCI pool, set).
- Each TCI state may be a QCL type A/D RS.
- SSB, CSI-RS, or SRS may be set as QCL type A/D RS.
- RRC parameters configure multiple TCI states for both DL and UL.
- the MAC CE may activate multiple TCI states out of multiple configured TCI states.
- a DCI may indicate one of multiple TCI states that have been activated.
- DCI may be UL/DL DCI.
- the indicated TCI conditions may apply to at least one (or all) of the UL/DL channels/RSs.
- One DCI may indicate both UL TCI and DL TCI.
- one point may be one TCI state that applies to both UL and DL, or two TCI states that apply to UL and DL respectively.
- At least one of the multiple TCI states set by the RRC parameters and the multiple TCI states activated by the MAC CE may be called a TCI pool (common TCI pool, joint TCI pool, TCI state pool). good.
- Multiple TCI states activated by a MAC CE may be called an active TCI pool (active common TCI pool).
- RRC parameters higher layer parameters that configure multiple TCI states
- configuration information that configures multiple TCI states, or simply "configuration information.”
- to indicate one of the plurality of TCI states using the DCI may be receiving indication information indicating one of the plurality of TCI states included in the DCI. , it may simply be to receive "instruction information”.
- the RRC parameters configure multiple TCI states (joint common TCI pools) for both DL and UL.
- the MAC CE may activate multiple TCI states (active TCI pool) out of multiple configured TCI states. Separate active TCI pools for each of the UL and DL may be configured/activated.
- a DL DCI or a new DCI format may select (indicate) one or more (eg, one) TCI states.
- the selected TCI state may be applied to one or more (or all) DL channels/RS.
- the DL channel may be PDCCH/PDSCH/CSI-RS.
- the UE uses Rel.
- a 16 TCI state operation (TCI framework) may be used to determine the TCI state for each channel/RS in the DL.
- a UL DCI or new DCI format may select (indicate) one or more (eg, one) TCI states.
- the selected TCI state may be applied to one or more (or all) UL channels/RS.
- the UL channel may be PUSCH/SRS/PUCCH.
- different DCIs may indicate UL TCI and DL DCI separately.
- the existing DCI format 1_2/1_2 may be used to indicate common TCI status.
- a common TCI framework may have separate TCI states for DL and UL.
- a common TCI framework may have separate TCI states for DL and UL. It is not preferred to use DCI format 1_1/1_2 to indicate UL only common TCI status.
- TRP Transmission/Reception Points
- MTRP Multi-TRP
- a UE may receive channels/signals from multiple cells/TRPs in inter-cell mobility (eg, L1/L2 inter-cell mobility) (see FIGS. 2A and 2B).
- inter-cell mobility eg, L1/L2 inter-cell mobility
- FIG. 2A shows an example of inter-cell mobility (eg, single TRP inter-cell mobility) including non-serving cells.
- Single TRP may refer to the case where only one TRP out of multiple TRPs transmits to the UE (which may be referred to as single mode).
- a CORESET pool index may point to a single TRP.
- the UE receives channels/signals from the base station/TRP of cell #1, which is the serving cell, and the base station/TRP of cell #3, which is not the serving cell (non-serving cell). showing. For example, this corresponds to the case where the UE switches/switches from cell #1 to cell #3 (eg, fast cell switch).
- the DCI/MAC CE may update the TCI state and dynamically select the port (eg, antenna port)/TRP/point.
- Different physical cell IDs eg, PCI are set for cell #1 and cell #3.
- FIG. 2B shows an example of a multi-TRP scenario (for example, multi-TRP inter-cell mobility when using multi-TRP).
- the UE is shown receiving channels/signals from TRP#1 and TRP2.
- TRP#1 exists in cell #1 (PCI#1)
- TRP#2 exists in cell #2 (PCI#2).
- Multi-TRPs may be connected by ideal/non-ideal backhauls to exchange information, data, and the like.
- Different codewords (CW) and different layers may be transmitted from each TRP of the multi-TRP.
- NJT non-coherent joint transmission
- FIG. 1B a case is shown where NCJT is performed between a plurality of cells (for example, cells of different PCIs). Note that the same serving cell configuration may be applied/configured to TRP#1 and TRP#2.
- TRP#1 modulate-maps a first codeword and layer-maps a first number of layers (e.g., two layers) to a first signal/channel using a first precoding. (eg, PDSCH).
- TRP#2 also modulation-maps a second codeword and layer-maps a second number of layers (e.g., two layers) to a second signal/channel (e.g., PDSCH).
- Multiple PDSCHs to be NCJTed may be defined as partially or completely overlapping in at least one of the time and frequency domains. That is, the first PDSCH from TRP#1 and the second PDSCH from TRP#2 may overlap at least one of time and frequency resources.
- first PDSCH and second PDSCH are not quasi-co-located (QCL).
- Reception of multiple PDSCHs may be translated as simultaneous reception of PDSCHs that are not of a certain QCL type (eg, QCL type D).
- Multiple PDSCHs from multiple TRPs may be scheduled using one DCI (single DCI (S-DCI), single PDCCH) (single master mode ).
- DCI single DCI
- S-DCI single DCI
- PDCCH single PDCCH
- One DCI may be transmitted from one TRP of a multi-TRP.
- a configuration that utilizes one DCI in multi-TRP may be referred to as single DCI-based multi-TRP (mTRP/MTRP).
- a case (which may be called a master-slave mode) in which each multi-TRP transmits part of the control signal to the UE and the multi-TRP transmits the data signal may be applied.
- Multiple PDSCHs from multiple TRPs may be scheduled using multiple DCIs (multiple DCI (M-DCI), multiple PDCCH (multiple PDCCH)) respectively (multimaster mode). Multiple DCIs may be transmitted from multiple TRPs respectively.
- M-DCI multiple DCI
- PDCCH multiple PDCCH
- Multiple DCIs may be transmitted from multiple TRPs respectively.
- a configuration that utilizes multiple DCIs in multi-TRP may be referred to as multi-DCI-based multi-TRP (mTRP/MTRP).
- CSI feedback may be referred to as separate feedback, separate CSI feedback, and so on.
- “separate” may be read interchangeably with “independent.”
- CSI-RS can be set as the TCI state of PDSCH/PDCCH (PDSCH/PDCCH DMRS) (PDSCH/PDCCH TCI state refers to CSI-RS).
- SSB can be set as the TCI state of the CSI-RS. However, it was not possible to directly set SSB as the TCI state of PDSCH/PDCCH. In the new mechanism of Rel. 17 using unified TCI state (single TRP inter-cell mobility), setting SSB (directly) as the TCI state for PDSCH/PDCCH is being considered.
- Inter-cell mobility (L1/L2 inter-cell mobility) as described above to facilitate more efficient (lower delay and overhead) DL/UL beam management in future wireless communication systems is being considered. .
- L1/L2 inter-cell mobility it is possible to change the serving cell using functions such as beam control without RRC reconfiguration. In other words, it is possible to transmit to and receive from non-serving cells without handover.
- L1/L2 inter-cell mobility that does not require handover is preferable because there is a period during which data communication is not possible, such as the need for RRC reconnection for handover.
- the question is how to control the transmission or reception of channels/signals transmitted from the same cell/TRP or from different cells/TRPs. becomes. If channels/signals transmitted from the same cell/TRP or from different cells/TRPs are not properly transmitted and received, the throughput or communication quality may deteriorate.
- the inventors conceived a control for properly transmitting or receiving multiple channels/signals from cells, including non-serving cells.
- the CSI report and beam report may be read interchangeably.
- Report and measurement may be read interchangeably.
- the panel Uplink (UL) transmitting entity, point, TRP, spatial relationship, control resource set (COntrol REsource SET (CORESET)), PDSCH, codeword, base station, antenna port of a signal (e.g., for demodulation Reference signal (DeModulation Reference Signal (DMRS) port), antenna port group for a certain signal (e.g. DMRS port group), group for multiplexing (e.g. Code Division Multiplexing (CDM)) group, reference signal group, CORESET group), CORESET pool, CORESET subset, CW, redundancy version (RV), layer (MIMO layer, transmission layer, spatial layer) may be read interchangeably.
- panel identifier (ID) and panel may be read interchangeably.
- TRP index, TRP ID, CORESET pool index, TCI state ordinal numbers (first, second) in two TCI states, and TRP may be read interchangeably.
- TCI state, common beam, common TCI, common TCI state, unified TCI, unified TCI state, UL TCI, DL TCI, joint TCI state, joint UL/DL TCI state, TCI state applicable to DL and UL , the TCI state applied to multiple (multiple types) of channels/RSs, the TCI state applicable to multiple types of channels/RSs, and PL-RS may be read interchangeably.
- TCI state multiple TCI states set by RRC, multiple TCI states activated by MAC CE, pool, TCI state pool, active TCI state pool, common TCI state pool, joint TCI state pool, separate
- the TCI state pool, the common TCI state pool for UL, the common TCI state pool for DL, the common TCI state pool configured/activated by RRC/MAC CE, and the TCI state information may be read interchangeably.
- beams, spatial domain filters, spatial settings, TCI states, UL TCI states, unified TCI states, unified beams, common TCI states, common beams, TCI assumptions, QCL assumptions, QCL parameters, spatial Domain Receive Filter, UE Spatial Domain Receive Filter, UE Receive Beam, DL Beam, DL Receive Beam, DL Precoding, DL Precoder, DL-RS, TCI State/QCL Assumed QCL Type D RS, TCI State/QCL Assumed QCL type A RS, spatial relationship, spatial domain transmit filter, UE spatial domain transmit filter, UE transmit beam, UL beam, UL transmit beam, UL precoding, UL precoder, PL-RS may be read interchangeably.
- QCL type X-RS, DL-RS associated with QCL type X, DL-RS with QCL type X, source of DL-RS, SSB, CSI-RS, SRS may be read interchangeably. good.
- single TRP single TRP
- channels with single TRP channels with one TCI state/spatial relationship
- multi-TRP not enabled by RRC/DCI multiple TCI states/spatial relations enabled by RRC/DCI shall not be set
- neither CORESET Pool Index (CORESETPoolIndex) value of 1 shall be set for any CORESET
- neither codepoint of the TCI field shall be mapped to two TCI states.
- multi-TRP channels with multi-TRP, channels with multiple TCI state/spatial relationships, multi-TRP enabled by RRC/DCI, multiple TCI state/spatial relationships enabled by RRC/DCI and at least one of multi-TRP based on a single DCI and multi-TRP based on multiple DCIs may be read interchangeably.
- cells, CCs, carriers, BWPs, and bands may be read interchangeably.
- indexes, IDs, indicators, and resource IDs may be read interchangeably.
- A/B may be read as “at least one of A and B”.
- CSI report setting (CSI-ReportConfig) and CSI report setting (CSI report setting) may be read interchangeably.
- CSI resource setting (CSI-ResourceConfig) and CSI resource setting (CSI resource setting) may be read interchangeably.
- RS may refer to at least one of CRI and SSBRI in CSI reporting.
- L1-RSRP and L1-SINR may be read interchangeably.
- SSB, SSB index, and SSBRI may be read interchangeably.
- UE is a physical cell ID (Physical Cell Identifier: PCI), different from the physical cell ID, a specific index indicating a serving cell and a non-serving cell (new ID described later) to receive configuration, setting may control the transmission of channel state information reports (CSI reports) corresponding to the specified index.
- PCI Physical Cell Identifier
- a 1-bit indicator to indicate serving cell/non-serving cell may be applied.
- a '0' may indicate a serving cell and a '1' may indicate a non-serving cell.
- "1" may indicate a serving cell and "0" may indicate a non-serving cell.
- a new ID e.g., re-index, re-numbered index indicating non-serving cell, group ID of CMR), or PCI (PCI used directly ) may be applied.
- the new ID may be configured only for the (available) serving and non-serving cells used by the UE. That is, the new ID can reduce the number of bits since it is less than the sum of serving and non-serving cells or PCI.
- This new ID may depend on RS configuration signaling (CSI reporting configuration/CSI resource configuration).
- This new ID may be, for example, '0' to indicate the serving cell, '1' to indicate non-serving cell #1, and '2' to indicate non-serving cell #2. That is, this new ID may indicate either the serving cell and one or more non-serving cells.
- a recreated index indicating a non-serving cell may be associated with part of the PCI. By using the recreated index instead of PCI, the number of information bits is reduced, and RRC signaling overhead can be reduced.
- a rebuilt index may be referred to as a rebuilt index.
- the new ID may be information similar to the 1-bit indicator described above. That is, the new ID may refer to the 1-bit indicator described above.
- the new ID parameter name is not limited to "New ID", and any name may be used.
- the UE may control transmission (reporting) of CSI reports containing (corresponding to) information indicating serving/non-serving cells.
- the information is information indicating the association between the reference signal/measurement result and the serving cell or non-serving cell, such as the above-mentioned 1-bit indicator, new ID, or the like.
- the report content may be, for example, at least one of SSB index, CRI, L1-RSRP, L1-SINR, L1-SNR, LI, RI, PMI, CQI.
- the UE may be configured with multiple non-serving cell configurations with separate RRC parameters and L1 beam reporting (CSI reporting) for multiple non-serving cells using the new ID. Then, one non-serving cell of the plurality of non-serving cells may be selected and the TCI state may be set.
- CSI reporting L1 beam reporting
- FIG. 3 is a diagram showing an example of a CSI report including information indicating serving/non-serving cells.
- a 1-bit indicator (1-bit indicator) indicating serving cell/non-serving cell or a new ID (new ID) indicating serving cell/non-serving cell is used.
- the UE uses the cell index if single transmission/reception point (single TRP) inter-cell mobility (see eg FIG. 2A) or multiple transmission/reception points (multi-TRP) inter-cell mobility (see eg FIG. 2B) is applied.
- PCI/serving cell index/new ID may receive the TCI state including that cell index (or may receive the TCI state along with the cell index).
- the TCI state may be a unified TCI state.
- the UE may determine that the TCI state is the TCI state corresponding to/associated with the cell index.
- the TCI state may be a TCI state having the received cell index or the cell index corresponding/related to the cell index as a QCL source.
- the UE may determine that the TCI state is that the channel/signal is transmitted from the cell with the cell index corresponding/related to the cell index (received cell index).
- inter-cell mobility single-TRP inter-cell mobility (see, eg, FIG. 2A) or multi-TRP inter-cell mobility (see, eg, FIG. 2B) may simply be referred to as inter-cell mobility.
- At least one of PCI, serving cell index/non-serving cell index, and new ID may be referred to as cell index.
- the cell index may be transmitted in the CSI-RS resources for channel measurement (CMR) corresponding to the L1-RSRP/SINR CSI reporting (or the cell index may be sent with the CMR).
- CMR channel measurement
- the UE may determine that the L1-RSRP/SINR measured using that CMR corresponds/relates to that cell index.
- the L1-RSRP/SINR may be an L1-RSRP/SINR having the cell index or a cell index corresponding/related to the cell index as a QCL source.
- the UE determines that the L1-RSRP/SINR is the L1-RSRP/SINR of a signal from a cell (another cell) having a cell index corresponding/related to the cell index (received cell index). good.
- the bit size (number of bits) of the new ID may correspond to the number of non-serving cells (number of IDs of non-serving cells, number of PCIs) set by higher layer signaling or the like.
- non-serving cell #1 corresponds to the serving cell (own cell).
- non-serving cell #2 corresponds to the serving cell (own cell).
- non-serving cell #3 corresponds to the serving cell (own cell).
- the specifications may stipulate the upper limit of the number of cells that can be supported (for example, 4 cells including the own cell). For example, this is to prevent the number of bits of the new ID from becoming too large or the number of cells for which the UE needs to perform L1 measurement.
- one simple way to support setting TCI states associated with non-serving cells is to set the PCI directly in the QCL/TCI state.
- setting the PCI directly in the QCL/TCI state increases RRC overhead. 10-bit RRC signaling is used for one PCI. If there are 64 TCI state settings from non-serving cells, it costs 640 bits.
- the total overhead is even higher since 10 bits are used for each CMR of the non-serving cell's SSB.
- a new ID can be recreated from the PCI, and the new ID can be set using the QCL/TCI state/CMR instead.
- the new ID if there is only 1 non-serving cell, a 1-bit new ID is sufficient to indicate the non-serving cell, and a 2-bit new ID is sufficient to indicate up to 3 non-serving cells. Recreating a new ID based on PCI saves a lot of signaling overhead.
- a new ID indicating the non-serving cell information with which the TCI state/QCL information is associated eg a regenerated index of the non-serving cell ID.
- Higher layer signaling may set up the link between the PCI and the new ID.
- the bit size of the new ID may depend on the number of non-serving cells supported by the cell (component carrier).
- a UE may support multiple non-serving cells being configured in a CC. It may support configuring at most one non-serving cell from the rebuild index to be associated with the CC's TCI-like/QCL configuration.
- an appropriate number of bits is set for a new ID, so overhead can be suppressed.
- the UE may receive the serving cell/non-serving cell index or the relationship between the PCI and the new ID via higher layer signaling (which may be configured via higher layer signaling).
- the relationship may be set by RRC and updated by MAC CE. Updating with MAC CE allows cell switching between many cells without RRC reconfiguration. If you set many non-serving cells from the beginning in RRC, RRC reconnection is unnecessary (in an extreme example, set 1007 non-serving cells), but the number of bits of the new ID increases, and the UE The UE load increases as the number of cells that need to measure the L1 beam increases.
- the UE may measure the CMR of the configured serving cell/non-serving cell index or serving cell index corresponding to PCI and perform L1-RSRP/SINR beam reporting (CSI reporting). Also, the TCI state or unified TCI state of the configured non-serving cell index or the serving cell index corresponding to the PCI may be configured.
- FIG. 4 is a diagram showing a first example of the relationship between serving cell/non-serving cell indices or PCIs and new IDs.
- the relationship between non-serving cells or PCIs and new IDs may be explicitly configured by higher layer signaling or the like.
- a specific method (order) may be used to define (set) the relationship between the serving cell/non-serving cell index or the PCI and the new ID.
- the smaller the non-serving cell index (PCI) the smaller the new ID may be configured (eg, see FIG. 5).
- a new smaller ID may be configured for a larger non-serving cell index (PCI).
- the serving cell may always be configured with the same new ID (eg, 0).
- FIG. 5 is a diagram showing a second example of the relationship between serving cell/non-serving cell indices or PCIs and new IDs.
- the UE activates (limits, selects, may receive a MAC CE to determine).
- the activated serving cell/non-serving cell index or PCI (candidate) may correspond to the new ID.
- FIG. 6 is a diagram showing an example of how to set the relationship between the serving cell/non-serving cell index or the PCI and the new ID.
- the UE is configured with a serving cell and non-serving cells #1 to #7 by RRC, one of which is activated by MAC CE.
- the serving cell may also be activated by MAC CE, and the serving cell may always be set with a new ID even if it is not activated by MAC CE.
- FIG. 6 shows an example in which new IDs corresponding to PCIs are set in the order set by RRC, but as in aspect 3-2, the smaller the PCI of the non-serving cell, the smaller the new ID set.
- an appropriate number of new IDs are set/activated regardless of the number of PCIs, so overhead can be suppressed.
- Each example of the present disclosure is applied based on at least one of reporting (transmitting) the corresponding UE capability (UE capability information) or setting the corresponding higher layer signaling (RRC parameter).
- the UE capabilities may be, for example, (1) to (5) below, but are not limited to the following examples, and UE capabilities indicating whether to support each example of the present disclosure may be used.
- the number of TCI states from non-serving cells per CC (or across all CCs or across all CCs per band) that can be activated in MAC CE (or serving and non-serving cells What is the total number of TCI states from both It should be noted that the number of activated TCI states in the MAC CE may be related to the processing power of the UE.
- the number of non-serving cells (number of different PCIs) that the UE can support for L1/L2 inter-cell mobility per CC (or across all CCs, or across all CCs per band). (5) Whether dynamic change of the DCI level of the serving cell is supported. If not supported, the UE can only support dynamic (slower than DCI) changing of the serving cell's MAC CE level.
- wireless communication system A configuration of a wireless communication system according to an embodiment of the present disclosure will be described below.
- communication is performed using any one of the radio communication methods according to the above embodiments of the present disclosure or a combination thereof.
- FIG. 7 is a diagram showing an example of a schematic configuration of a wireless communication system according to one embodiment.
- the wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc. specified by the Third Generation Partnership Project (3GPP). .
- LTE Long Term Evolution
- 5G NR 5th generation mobile communication system New Radio
- 3GPP Third Generation Partnership Project
- the wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)).
- RATs Radio Access Technologies
- MR-DC is dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E -UTRA Dual Connectivity (NE-DC)), etc.
- RATs Radio Access Technologies
- MR-DC is dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E -UTRA Dual Connectivity (NE-DC)), etc.
- LTE Evolved Universal Terrestrial Radio Access
- EN-DC E-UTRA-NR Dual Connectivity
- NE-DC NR-E -UTRA Dual Connectivity
- the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the secondary node (SN).
- the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.
- the wireless communication system 1 has dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC) in which both MN and SN are NR base stations (gNB) )) may be supported.
- dual connectivity NR-NR Dual Connectivity (NN-DC) in which both MN and SN are NR base stations (gNB)
- gNB NR base stations
- a wireless communication system 1 includes a base station 11 forming a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) arranged in the macrocell C1 and forming a small cell C2 narrower than the macrocell C1. You may prepare.
- a user terminal 20 may be located within at least one cell. The arrangement, number, etc. of each cell and user terminals 20 are not limited to the embodiment shown in the figure.
- the base stations 11 and 12 are collectively referred to as the base station 10 when not distinguished.
- the user terminal 20 may connect to at least one of the multiple base stations 10 .
- the user terminal 20 may utilize at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).
- CA carrier aggregation
- CC component carriers
- DC dual connectivity
- Each CC may be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)).
- Macrocell C1 may be included in FR1, and small cell C2 may be included in FR2.
- FR1 may be a frequency band below 6 GHz (sub-6 GHz)
- FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a higher frequency band than FR2.
- the user terminal 20 may communicate using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.
- TDD Time Division Duplex
- FDD Frequency Division Duplex
- a plurality of base stations 10 may be connected by wire (for example, an optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (for example, NR communication).
- wire for example, an optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.
- NR communication for example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station is an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) is an IAB Also called a node.
- IAB Integrated Access Backhaul
- relay station relay station
- the base station 10 may be connected to the core network 30 directly or via another base station 10 .
- the core network 30 may include, for example, at least one of Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), and the like.
- EPC Evolved Packet Core
- 5GCN 5G Core Network
- NGC Next Generation Core
- the user terminal 20 may be a terminal compatible with at least one of communication schemes such as LTE, LTE-A, and 5G.
- a radio access scheme based on orthogonal frequency division multiplexing may be used.
- OFDM orthogonal frequency division multiplexing
- CP-OFDM Cyclic Prefix OFDM
- DFT-s-OFDM Discrete Fourier Transform Spread OFDM
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- a radio access method may be called a waveform.
- other radio access schemes for example, other single-carrier transmission schemes and other multi-carrier transmission schemes
- the UL and DL radio access schemes may be used as the UL and DL radio access schemes.
- a downlink shared channel Physical Downlink Shared Channel (PDSCH)
- PDSCH Physical Downlink Shared Channel
- PBCH Physical Broadcast Channel
- PDCCH Physical Downlink Control Channel
- an uplink shared channel (PUSCH) shared by each user terminal 20 an uplink control channel (PUCCH), a random access channel (Physical Random Access Channel (PRACH)) or the like may be used.
- PUSCH uplink shared channel
- PUCCH uplink control channel
- PRACH Physical Random Access Channel
- User data, upper layer control information, System Information Block (SIB), etc. are transmitted by the PDSCH.
- User data, higher layer control information, and the like may be transmitted by PUSCH.
- a Master Information Block (MIB) may be transmitted by the PBCH.
- Lower layer control information may be transmitted by the PDCCH.
- the lower layer control information may include, for example, downlink control information (DCI) including scheduling information for at least one of PDSCH and PUSCH.
- DCI downlink control information
- the DCI that schedules PDSCH may be called DL assignment, DL DCI, etc.
- the DCI that schedules PUSCH may be called UL grant, UL DCI, etc.
- PDSCH may be replaced with DL data
- PUSCH may be replaced with UL data.
- a control resource set (CControl Resource SET (CORESET)) and a search space (search space) may be used for PDCCH detection.
- CORESET corresponds to a resource searching for DCI.
- the search space corresponds to the search area and search method of PDCCH candidates.
- a CORESET may be associated with one or more search spaces. The UE may monitor CORESETs associated with certain search spaces based on the search space settings.
- One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels.
- One or more search spaces may be referred to as a search space set. Note that “search space”, “search space set”, “search space setting”, “search space set setting”, “CORESET”, “CORESET setting”, etc. in the present disclosure may be read interchangeably.
- PUCCH channel state information
- acknowledgment information for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK/NACK, etc.
- SR scheduling request
- a random access preamble for connection establishment with a cell may be transmitted by the PRACH.
- downlink, uplink, etc. may be expressed without adding "link”.
- various channels may be expressed without adding "Physical" to the head.
- synchronization signals SS
- downlink reference signals DL-RS
- the DL-RS includes a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DeModulation Reference Signal (DMRS)), Positioning Reference Signal (PRS)), Phase Tracking Reference Signal (PTRS)), etc.
- CRS cell-specific reference signal
- CSI-RS channel state information reference signal
- DMRS Demodulation reference signal
- PRS Positioning Reference Signal
- PTRS Phase Tracking Reference Signal
- the synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- a signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called SS/PBCH block, SS Block (SSB), and so on.
- SS, SSB, etc. may also be referred to as reference signals.
- DMRS may also be called a user terminal-specific reference signal (UE-specific reference signal).
- FIG. 8 is a diagram illustrating an example of the configuration of a base station according to one embodiment.
- the base station 10 comprises a control section 110 , a transmission/reception section 120 , a transmission/reception antenna 130 and a transmission line interface 140 .
- One or more of each of the control unit 110, the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission line interface 140 may be provided.
- this example mainly shows the functional blocks that characterize the present embodiment, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.
- the control unit 110 controls the base station 10 as a whole.
- the control unit 110 can be configured from a controller, a control circuit, and the like, which are explained based on common recognition in the technical field according to the present disclosure.
- the control unit 110 may control signal generation, scheduling (eg, resource allocation, mapping), and the like.
- the control unit 110 may control transmission/reception, measurement, etc. using the transmission/reception unit 120 , the transmission/reception antenna 130 and the transmission line interface 140 .
- the control unit 110 may generate data to be transmitted as a signal, control information, a sequence, etc., and transfer them to the transmission/reception unit 120 .
- the control unit 110 may perform call processing (setup, release, etc.) of communication channels, state management of the base station 10, management of radio resources, and the like.
- the transmitting/receiving section 120 may include a baseband section 121 , a radio frequency (RF) section 122 and a measuring section 123 .
- the baseband section 121 may include a transmission processing section 1211 and a reception processing section 1212 .
- the transmitting/receiving unit 120 is configured from a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting/receiving circuit, etc., which are explained based on common recognition in the technical field according to the present disclosure. be able to.
- the transmission/reception unit 120 may be configured as an integrated transmission/reception unit, or may be configured from a transmission unit and a reception unit.
- the transmission section may be composed of the transmission processing section 1211 and the RF section 122 .
- the receiving section may be composed of a reception processing section 1212 , an RF section 122 and a measurement section 123 .
- the transmitting/receiving antenna 130 can be configured from an antenna described based on common recognition in the technical field related to the present disclosure, such as an array antenna.
- the transmitting/receiving unit 120 may transmit the above-described downlink channel, synchronization signal, downlink reference signal, and the like.
- the transmitting/receiving unit 120 may receive the above-described uplink channel, uplink reference signal, and the like.
- the transmitting/receiving unit 120 may form at least one of the transmission beam and the reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.
- digital beamforming eg, precoding
- analog beamforming eg, phase rotation
- the transmission/reception unit 120 (transmission processing unit 1211) performs Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. may be performed to generate a bit string to be transmitted.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access Control
- HARQ retransmission control for example, HARQ retransmission control
- the transmission/reception unit 120 (transmission processing unit 1211) performs channel coding (which may include error correction coding), modulation, mapping, filtering, and discrete Fourier transform (DFT) on the bit string to be transmitted. Processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, transmission processing such as digital-to-analog conversion may be performed, and the baseband signal may be output.
- channel coding which may include error correction coding
- modulation modulation
- mapping mapping
- filtering filtering
- DFT discrete Fourier transform
- DFT discrete Fourier transform
- the transmitting/receiving unit 120 may perform modulation to a radio frequency band, filter processing, amplification, and the like on the baseband signal, and may transmit the radio frequency band signal via the transmitting/receiving antenna 130. .
- the transmitting/receiving unit 120 may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting/receiving antenna 130.
- the transmission/reception unit 120 (reception processing unit 1212) performs analog-to-digital conversion, Fast Fourier transform (FFT) processing, and Inverse Discrete Fourier transform (IDFT) processing on the acquired baseband signal. )) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing and PDCP layer processing. User data and the like may be acquired.
- FFT Fast Fourier transform
- IDFT Inverse Discrete Fourier transform
- the transmitting/receiving unit 120 may measure the received signal.
- the measurement unit 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, etc. based on the received signal.
- the measurement unit 123 measures received power (for example, Reference Signal Received Power (RSRP)), reception quality (for example, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)) , signal strength (for example, Received Signal Strength Indicator (RSSI)), channel information (for example, CSI), and the like may be measured.
- RSRP Reference Signal Received Power
- RSSQ Reference Signal Received Quality
- SINR Signal to Noise Ratio
- RSSI Received Signal Strength Indicator
- channel information for example, CSI
- the transmission path interface 140 transmits and receives signals (backhaul signaling) to and from devices included in the core network 30, other base stations 10, etc., and user data (user plane data) for the user terminal 20, control plane data, and the like. Data and the like may be obtained, transmitted, and the like.
- the transmitter and receiver of the base station 10 in the present disclosure may be configured by at least one of the transmitter/receiver 120, the transmitter/receiver antenna 130, and the transmission path interface 140.
- the transmitting/receiving unit 120 may transmit a setting of a specific index indicating a serving cell and a non-serving cell, which is created based on the physical cell ID and is different from the physical cell ID.
- the transmitting/receiving unit 120 may receive the channel state information report corresponding to the configured specific index.
- the control unit 110 may control reception of the channel state information report corresponding to the set specific index.
- FIG. 9 is a diagram illustrating an example of the configuration of a user terminal according to one embodiment.
- the user terminal 20 includes a control section 210 , a transmission/reception section 220 and a transmission/reception antenna 230 .
- One or more of each of the control unit 210, the transmitting/receiving unit 220, and the transmitting/receiving antenna 230 may be provided.
- this example mainly shows the functional blocks of the features of the present embodiment, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.
- the control unit 210 controls the user terminal 20 as a whole.
- the control unit 210 can be configured from a controller, a control circuit, and the like, which are explained based on common recognition in the technical field according to the present disclosure.
- the control unit 210 may control signal generation, mapping, and the like.
- the control unit 210 may control transmission/reception, measurement, etc. using the transmission/reception unit 220 and the transmission/reception antenna 230 .
- the control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission/reception unit 220 .
- the transmitting/receiving section 220 may include a baseband section 221 , an RF section 222 and a measurement section 223 .
- the baseband section 221 may include a transmission processing section 2211 and a reception processing section 2212 .
- the transmitting/receiving unit 220 can be configured from a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting/receiving circuit, etc., which are explained based on common recognition in the technical field according to the present disclosure.
- the transmission/reception unit 220 may be configured as an integrated transmission/reception unit, or may be configured from a transmission unit and a reception unit.
- the transmission section may be composed of a transmission processing section 2211 and an RF section 222 .
- the receiving section may include a reception processing section 2212 , an RF section 222 and a measurement section 223 .
- the transmitting/receiving antenna 230 can be configured from an antenna described based on common recognition in the technical field related to the present disclosure, such as an array antenna.
- the transmitting/receiving unit 220 may receive the above-described downlink channel, synchronization signal, downlink reference signal, and the like.
- the transmitting/receiving unit 220 may transmit the above-described uplink channel, uplink reference signal, and the like.
- the transmitter/receiver 220 may form at least one of the transmission beam and the reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.
- digital beamforming eg, precoding
- analog beamforming eg, phase rotation
- the transmission/reception unit 220 (transmission processing unit 2211) performs PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, for data and control information acquired from the control unit 210, for example , HARQ retransmission control), etc., to generate a bit string to be transmitted.
- RLC layer processing for example, RLC retransmission control
- MAC layer processing for example, for data and control information acquired from the control unit 210, for example , HARQ retransmission control
- the transmitting/receiving unit 220 (transmission processing unit 2211) performs channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), and IFFT processing on a bit string to be transmitted. , precoding, digital-analog conversion, and other transmission processing may be performed, and the baseband signal may be output.
- Whether or not to apply DFT processing may be based on transform precoding settings. Transmitting/receiving unit 220 (transmission processing unit 2211), for a certain channel (for example, PUSCH), if transform precoding is enabled, the above to transmit the channel using the DFT-s-OFDM waveform
- the DFT process may be performed as the transmission process, or otherwise the DFT process may not be performed as the transmission process.
- the transmitting/receiving unit 220 may perform modulation to a radio frequency band, filter processing, amplification, and the like on the baseband signal, and may transmit the radio frequency band signal via the transmitting/receiving antenna 230. .
- the transmitting/receiving section 220 may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting/receiving antenna 230.
- the transmission/reception unit 220 (reception processing unit 2212) performs analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (error correction) on the acquired baseband signal. decoding), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing may be applied to acquire user data and the like.
- the transmitting/receiving section 220 may measure the received signal.
- the measurement unit 223 may perform RRM measurement, CSI measurement, etc. based on the received signal.
- the measuring unit 223 may measure received power (eg, RSRP), received quality (eg, RSRQ, SINR, SNR), signal strength (eg, RSSI), channel information (eg, CSI), and the like.
- the measurement result may be output to control section 210 .
- the transmitter and receiver of the user terminal 20 in the present disclosure may be configured by at least one of the transmitter/receiver 220 and the transmitter/receiver antenna 230 .
- the transmitting/receiving unit 220 may receive a setting of a specific index indicating a serving cell and a non-serving cell, which is created based on the physical cell ID and is different from the physical cell ID.
- the transceiver unit 220 may receive a transmission configuration indication (TCI) state corresponding to the specific index when inter-cell mobility of a single transmission/reception point or multiple transmission/reception points is applied.
- TCI transmission configuration indication
- the transmitting/receiving unit 220 may receive the relationship between the serving cell index, the non-serving cell index, or the physical cell ID and the specific index through higher layer signaling.
- the transmitting/receiving unit 220 receives candidates for the serving cell index, the non-serving cell index, or the physical cell ID through higher layer signaling, and activates at least one of the candidates Medium Access Control Control Element (MAC CE). may receive.
- the activated candidate may correspond to the particular index.
- the control unit 210 may control transmission of the channel state information report corresponding to the set specific index.
- each functional block may be implemented using one device that is physically or logically coupled, or directly or indirectly using two or more devices that are physically or logically separated (e.g. , wired, wireless, etc.) and may be implemented using these multiple devices.
- a functional block may be implemented by combining software in the one device or the plurality of devices.
- function includes judgment, decision, determination, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, deem , broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc.
- a functional block (component) that performs transmission may be called a transmitting unit, a transmitter, or the like. In either case, as described above, the implementation method is not particularly limited.
- a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure.
- FIG. 10 is a diagram illustrating an example of hardware configurations of a base station and a user terminal according to one embodiment.
- the base station 10 and user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. .
- the hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without some devices.
- processor 1001 may be implemented by one or more chips.
- predetermined software program
- the processor 1001 performs calculations, communication via the communication device 1004 and at least one of reading and writing data in the memory 1002 and the storage 1003 .
- the processor 1001 operates an operating system and controls the entire computer.
- the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like.
- CPU central processing unit
- control unit 110 210
- transmission/reception unit 120 220
- FIG. 10 FIG. 10
- the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes according to them.
- programs program codes
- software modules software modules
- data etc.
- the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and other functional blocks may be similarly implemented.
- the memory 1002 is a computer-readable recording medium, such as Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), or at least any other suitable storage medium. may be configured by one.
- the memory 1002 may also be called a register, cache, main memory (main storage device), or the like.
- the memory 1002 can store executable programs (program code), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.
- the storage 1003 is a computer-readable recording medium, for example, a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (Compact Disc ROM (CD-ROM), etc.), a digital versatile disk, Blu-ray disc), removable disc, hard disk drive, smart card, flash memory device (e.g., card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium may be configured by Storage 1003 may also be called an auxiliary storage device.
- a computer-readable recording medium for example, a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (Compact Disc ROM (CD-ROM), etc.), a digital versatile disk, Blu-ray disc), removable disc, hard disk drive, smart card, flash memory device (e.g., card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium may be configured by Storage 1003 may also
- the communication device 1004 is hardware (transmitting/receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, or the like.
- the communication device 1004 includes a high-frequency switch, duplexer, filter, frequency synthesizer, etc. in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD), for example. may be configured to include
- the transmitting/receiving unit 120 (220), the transmitting/receiving antenna 130 (230), and the like described above may be realized by the communication device 1004.
- the transmitter/receiver 120 (220) may be physically or logically separated into a transmitter 120a (220a) and a receiver 120b (220b).
- the input device 1005 is an input device (for example, keyboard, mouse, microphone, switch, button, sensor, etc.) that receives input from the outside.
- the output device 1006 is an output device (for example, a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated (for example, a touch panel).
- Each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information.
- the bus 1007 may be configured using a single bus, or may be configured using different buses between devices.
- the base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc. It may be configured including hardware, and a part or all of each functional block may be realized using the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.
- DSP digital signal processor
- ASIC application specific integrated circuit
- PLD programmable logic device
- FPGA field programmable gate array
- a signal may also be a message.
- a reference signal may be abbreviated as RS, and may also be called a pilot, a pilot signal, etc., depending on the applicable standard.
- a component carrier may also be called a cell, a frequency carrier, a carrier frequency, or the like.
- a radio frame may consist of one or more periods (frames) in the time domain.
- Each of the one or more periods (frames) that make up a radio frame may be called a subframe.
- a subframe may consist of one or more slots in the time domain.
- a subframe may be a fixed time length (eg, 1 ms) independent of numerology.
- a numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel.
- Numerology for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration , a particular filtering process performed by the transceiver in the frequency domain, a particular windowing process performed by the transceiver in the time domain, and/or the like.
- a slot may consist of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain.
- OFDM Orthogonal Frequency Division Multiplexing
- SC-FDMA Single Carrier Frequency Division Multiple Access
- a slot may also be a unit of time based on numerology.
- a slot may contain multiple mini-slots. Each minislot may consist of one or more symbols in the time domain. A minislot may also be referred to as a subslot. A minislot may consist of fewer symbols than a slot.
- a PDSCH (or PUSCH) transmitted in time units larger than a minislot may be referred to as PDSCH (PUSCH) Mapping Type A.
- PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (PUSCH) mapping type B.
- Radio frames, subframes, slots, minislots and symbols all represent time units when transmitting signals. Radio frames, subframes, slots, minislots and symbols may be referred to by other corresponding designations. Note that time units such as frames, subframes, slots, minislots, and symbols in the present disclosure may be read interchangeably.
- one subframe may be called a TTI
- a plurality of consecutive subframes may be called a TTI
- one slot or one minislot may be called a TTI. That is, at least one of the subframe and TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms may be Note that the unit representing the TTI may be called a slot, mini-slot, or the like instead of a subframe.
- TTI refers to, for example, the minimum scheduling time unit in wireless communication.
- a base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used by each user terminal) to each user terminal on a TTI basis.
- radio resources frequency bandwidth, transmission power, etc. that can be used by each user terminal
- a TTI may be a transmission time unit such as a channel-encoded data packet (transport block), code block, or codeword, or may be a processing unit such as scheduling and link adaptation. Note that when a TTI is given, the time interval (for example, the number of symbols) in which transport blocks, code blocks, codewords, etc. are actually mapped may be shorter than the TTI.
- one or more TTIs may be the minimum scheduling time unit. Also, the number of slots (the number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.
- a TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, or the like.
- a TTI that is shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, and the like.
- the long TTI (e.g., normal TTI, subframe, etc.) may be replaced with a TTI having a time length exceeding 1 ms
- the short TTI e.g., shortened TTI, etc.
- a TTI having the above TTI length may be read instead.
- a resource block is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers (subcarriers) in the frequency domain.
- the number of subcarriers included in the RB may be the same regardless of the neumerology, eg twelve.
- the number of subcarriers included in an RB may be determined based on neumerology.
- an RB may contain one or more symbols in the time domain and may be 1 slot, 1 minislot, 1 subframe or 1 TTI long.
- One TTI, one subframe, etc. may each be configured with one or more resource blocks.
- One or more RBs are Physical Resource Block (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB pair, RB Also called a pair.
- PRB Physical Resource Block
- SCG Sub-Carrier Group
- REG Resource Element Group
- PRB pair RB Also called a pair.
- a resource block may be composed of one or more resource elements (Resource Element (RE)).
- RE resource elements
- 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.
- a Bandwidth Part (which may also be called a bandwidth part) represents a subset of contiguous common resource blocks (RBs) for a numerology on a carrier.
- the common RB may be identified by an RB index based on the common reference point of the carrier.
- PRBs may be defined in a BWP and numbered within that BWP.
- BWP may include UL BWP (BWP for UL) and DL BWP (BWP for DL).
- BWP for UL
- BWP for DL DL BWP
- One or multiple BWPs may be configured for a UE within one carrier.
- At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal/channel outside the active BWP.
- BWP bitmap
- radio frames, subframes, slots, minislots, symbols, etc. described above are merely examples.
- the number of subframes contained in a radio frame, the number of slots per subframe or radio frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, the number of Configurations such as the number of subcarriers and the number of symbols in a TTI, symbol length, cyclic prefix (CP) length, etc. can be varied.
- the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values from a predetermined value, or may be expressed using other corresponding information. may be represented. For example, radio resources may be indicated by a predetermined index.
- data, instructions, commands, information, signals, bits, symbols, chips, etc. may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. may be represented by a combination of
- information, signals, etc. can be output from a higher layer to a lower layer and/or from a lower layer to a higher layer.
- Information, signals, etc. may be input and output through multiple network nodes.
- Input/output information, signals, etc. may be stored in a specific location (for example, memory), or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated or appended. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to other devices.
- Uplink Control Information (UCI) Uplink Control Information
- RRC Radio Resource Control
- MIB Master Information Block
- SIB System Information Block
- SIB System Information Block
- MAC Medium Access Control
- the physical layer signaling may also be called Layer 1/Layer 2 (L1/L2) control information (L1/L2 control signal), L1 control information (L1 control signal), and the like.
- RRC signaling may also be called an RRC message, and may be, for example, an RRC connection setup message, an RRC connection reconfiguration message, or the like.
- MAC signaling may be notified using, for example, a MAC Control Element (CE).
- CE MAC Control Element
- notification of predetermined information is not limited to explicit notification, but implicit notification (for example, by not notifying the predetermined information or by providing another information by notice of
- the determination may be made by a value (0 or 1) represented by 1 bit, or by a boolean value represented by true or false. , may be performed by numerical comparison (eg, comparison with a predetermined value).
- Software whether referred to as software, firmware, middleware, microcode, hardware description language or otherwise, includes instructions, instruction sets, code, code segments, program code, programs, subprograms, and software modules. , applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.
- software, instructions, information, etc. may be transmitted and received via a transmission medium.
- the software uses wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and/or wireless technology (infrared, microwave, etc.) , a server, or other remote source, these wired and/or wireless technologies are included within the definition of transmission media.
- a “network” may refer to devices (eg, base stations) included in a network.
- precoding "precoding weight”
- QCL Quality of Co-Location
- TCI state Transmission Configuration Indication state
- spatialal patial relation
- spatialal domain filter "transmission power”
- phase rotation "antenna port
- antenna port group "layer”
- number of layers Terms such as “rank”, “resource”, “resource set”, “resource group”, “beam”, “beam width”, “beam angle”, “antenna”, “antenna element”, “panel” are interchangeable. can be used as intended.
- base station BS
- radio base station fixed station
- NodeB NodeB
- eNB eNodeB
- gNB gNodeB
- Access point "Transmission Point (TP)”, “Reception Point (RP)”, “Transmission/Reception Point (TRP)”, “Panel”
- a base station may also be referred to by terms such as macrocell, small cell, femtocell, picocell, and the like.
- a base station can accommodate one or more (eg, three) cells.
- the overall coverage area of the base station can be partitioned into multiple smaller areas, and each smaller area is assigned to a base station subsystem (e.g., a small indoor base station (Remote Radio)). Head (RRH))) may also provide communication services.
- a base station subsystem e.g., a small indoor base station (Remote Radio)). Head (RRH)
- RRH Head
- the terms "cell” or “sector” refer to part or all of the coverage area of at least one of the base stations and base station subsystems that serve communication within such coverage.
- MS Mobile Station
- UE User Equipment
- Mobile stations include subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals. , a handset, a user agent, a mobile client, a client, or some other suitable term.
- At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, or the like.
- At least one of the base station and the mobile station may be a device mounted on a mobile object, the mobile object itself, or the like.
- the mobile object may be a vehicle (e.g., car, airplane, etc.), an unmanned mobile object (e.g., drone, self-driving car, etc.), or a robot (manned or unmanned ).
- at least one of the base station and the mobile station includes devices that do not necessarily move during communication operations.
- at least one of the base station and mobile station may be an Internet of Things (IoT) device such as a sensor.
- IoT Internet of Things
- the base station in the present disclosure may be read as a user terminal.
- communication between a base station and a user terminal is replaced with communication between multiple user terminals (for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.)
- the user terminal 20 may have the functions of the base station 10 described above.
- words such as "uplink” and “downlink” may be replaced with words corresponding to communication between terminals (for example, "sidelink”).
- uplink channels, downlink channels, etc. may be read as sidelink channels.
- user terminals in the present disclosure may be read as base stations.
- the base station 10 may have the functions of the user terminal 20 described above.
- operations that are assumed to be performed by the base station may be performed by its upper node in some cases.
- various operations performed for communication with a terminal may involve the base station, one or more network nodes other than the base station (e.g., Clearly, this can be done by a Mobility Management Entity (MME), Serving-Gateway (S-GW), etc. (but not limited to these) or a combination thereof.
- MME Mobility Management Entity
- S-GW Serving-Gateway
- each aspect/embodiment described in the present disclosure may be used alone, may be used in combination, or may be used by switching along with execution. Also, the processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described in the present disclosure may be rearranged as long as there is no contradiction. For example, the methods described in this disclosure present elements of the various steps using a sample order and are not limited to the specific order presented.
- LTE Long Term Evolution
- LTE-A LTE-Advanced
- LTE-B LTE-Beyond
- SUPER 3G IMT-Advanced
- 4G 4th generation mobile communication system
- 5G 5th generation mobile communication system
- 6G 6th generation mobile communication system
- xG xG (xG (x is, for example, an integer or a decimal number)
- Future Radio Access FAA
- RAT New - Radio Access Technology
- NR New Radio
- NX New radio access
- FX Future generation radio access
- GSM registered trademark
- CDMA2000 Code Division Multiple Access
- UMB Ultra Mobile Broadband
- IEEE 802.11 Wi-Fi®
- IEEE 802.16 WiMAX®
- IEEE 802.20 Ultra-WideBand (UWB), Bluetooth®, or other suitable wireless It may be applied to systems using communication methods, next-generation systems extended based on these, and the like. Also, multiple systems may be applied to systems using communication methods, next-generation systems extended based on these, and the like
- determining includes judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry ( For example, looking up in a table, database, or another data structure), ascertaining, etc. may be considered to be “determining.”
- determining (deciding) includes receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, access ( accessing (e.g., accessing data in memory), etc.
- determining is considered to be “determining” resolving, selecting, choosing, establishing, comparing, etc. good too. That is, “determining (determining)” may be regarded as “determining (determining)” some action.
- connection refers to any connection or coupling, direct or indirect, between two or more elements. and can include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” to each other. Couplings or connections between elements may be physical, logical, or a combination thereof. For example, "connection” may be read as "access”.
- radio frequency domain when two elements are connected, using one or more wires, cables, printed electrical connections, etc., and as some non-limiting and non-exhaustive examples, radio frequency domain, microwave They can be considered to be “connected” or “coupled” together using the domain, electromagnetic energy having wavelengths in the optical (both visible and invisible) domain, and the like.
- a and B are different may mean “A and B are different from each other.”
- the term may also mean that "A and B are different from C”.
- Terms such as “separate,” “coupled,” etc. may also be interpreted in the same manner as “different.”
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Abstract
Description
NRにおいては、UEは、所定の参照信号(又は、当該参照信号用のリソース)を用いてチャネル状態を測定し、チャネル状態情報(Channel State Information:CSI)を基地局にフィードバック(報告)する。
これまでRel-15 NRにおいては、ビーム管理(Beam Management:BM)の方法が検討されてきた。当該ビーム管理においては、UEが報告したL1-RSRPをベースに、ビーム選択(beam selection)を行うことが検討されている。ある信号/チャネルのビームを変更する(切り替える)ことは、当該信号/チャネルの(Transmission Configuration Indication state)を変更することに相当してもよい。
NRでは、送信設定指示状態(Transmission Configuration Indication state(TCI状態))に基づいて、信号及びチャネルの少なくとも一方(信号/チャネルと表現する)のUEにおける受信処理(例えば、受信、デマッピング、復調、復号の少なくとも1つ)、送信処理(例えば、送信、マッピング、プリコーディング、変調、符号化の少なくとも1つ)を制御することが検討されている。
・QCLタイプA(QCL-A):ドップラーシフト、ドップラースプレッド、平均遅延及び遅延スプレッド、
・QCLタイプB(QCL-B):ドップラーシフト及びドップラースプレッド、
・QCLタイプC(QCL-C):ドップラーシフト及び平均遅延、
・QCLタイプD(QCL-D):空間受信パラメータ。
統一TCIフレームワークによれば、UL及びDLのチャネルを共通のフレームワークによって制御できる。統一TCIフレームワークは、Rel.15のようにTCI状態又は空間関係をチャネルごとに規定するのではなく、共通ビーム(共通TCI状態)を指示し、それをUL及びDLの全てのチャネルへ適用してもよいし、UL用の共通ビームをULの全てのチャネルに適用し、DL用の共通ビームをDLの全てのチャネルに適用してもよい。
ところで、NRでは、1つ又は複数の送受信ポイント(Transmission/Reception Point(TRP))(マルチTRP(Multi-TRP(MTRP)))が、UEに対してDL送信を行うことが検討されている。また、UEが、1つ又は複数のTRPに対してUL送信を行うことが検討されている。
UEは、物理セルID(Physical Cell Identifier:PCI)に基づいて作成された、物理セルIDとは別の、サービングセル及び非サービングセルを示す特定のインデックス(後述の新しいID)の設定を受信し、設定された特定のインデックスに対応するチャネル状態情報報告(CSI報告)の送信を制御してもよい。
[1ビットのインジケータ]
サービングセル/非サービングセルを示す1ビットのインジケータが適用されてもよい。例えば、「0」がサービングセルを示し、「1」が非サービングセルを示してもよい。また、「1」がサービングセルを示し、「0」が非サービングセルを示してもよい。
サービングセル/非サービングセルを示す情報として、新しいID(例えば、非サービングセルを示す再作成(re-index、再付番、re-number)されたインデックス、CMRのグループID)、又はPCI(直接用いられるPCI)が適用されてもよい。新しいIDは、UEが利用する(利用可能な)サービングセル及び非サービングセルにのみ設定されてもよい。すなわち、新しいIDは、サービングセル及び非サービングセルの合計、又はPCIよりも少ないのでビット数を削減することができる。
UEは、サービングセルのRS(例えばSSB)の設定及び非サービングセルのRS(例えばSSB)の設定の両方を含む同じ(1つの)CSI報告設定/CSIリソース設定を受信する場合、従来のレポートコンテンツに加えて、サービングセル/非サービングセルを示す情報を含む(当該情報に対応する)CSI報告の送信(報告)を制御してもよい。当該情報は、参照信号/測定結果と、サービングセル又は非サービングセルと、の関連付けを示す情報であり、例えば、上述の1ビットのインジケータ、新しいID等である。当該レポートコンテンツは、例えば、SSBインデックス、CRI、L1-RSRP、L1-SINR、L1-SNR、LI、RI、PMI、CQIの少なくとも1つであってもよい。
UEは、単一の送受信ポイント(シングルTRP)のセル間モビリティ(例えば図2A参照)又は複数の送受信ポイント(マルチTRP)のセル間モビリティ(例えば図2B参照)が適用される場合に、セルインデックス(PCI/サービングセルインデックス/新しいID)に対応し、当該セルインデックスを含むTCI状態を受信してもよい(又はセルインデックスとともにTCI状態を受信してもよい)。当該TCI状態は、統一TCI状態であってもよい。UEは、当該TCI状態が、当該セルインデックスに対応/関連するTCI状態であると判断してもよい。当該TCI状態は、受信した当該セルインデックス又は当該セルインデックスに対応/関連するセルインデックスをQCLソースとして有するTCI状態であってもよい。UEは、当該TCI状態は、当該セルインデックス(受信したセルインデックス)に対応/関連するセルインデックスを有するセルからチャネル/信号が送信されると判断してもよい。
上記新しいIDのビットサイズ(ビット数)は、上位レイヤシグナリング等により設定された非サービングセル数(非サービングセルのIDの数、PCIの数)に対応していてもよい。例えば、ビット数Nは、以下の式(1)により決定される。なお、ceil(X)は、X以上の最小の整数を示す。
N=ceil(log2(非サービングセル数+1))
[態様3-1]
UEは、サービングセル/非サービングセルインデックス又はPCIと新しいIDとの関係を、上位レイヤシグナリングにより受信してもよい(上位レイヤシグナリングにより設定されてもよい)。例えば当該関係がRRCにより設定され、MAC CEにより更新されてもよい。MAC CEにより更新することにより、RRC再設定することなく、多くのセル間において、セル切り替えが可能になる。RRCではじめから多くの非サービングセルを設定しておけばRRC再接続は不要だが(極端な例だと、1007の非サービングセルを設定しておく)、新しいIDのビット数が大きくなったり、UEがL1ビームを測定する必要のあるセル数が増えてUE負荷が増大する。
UEは、上位レイヤシグナリング(RRC)により受信した(設定された)複数のサービングセル/非サービングセルインデックス又はPCI(サービングセル/非サービングセルインデックス又はPCIの候補)の中から少なくとも一つをアクティベート(限定、選択、決定)するMAC CEを受信してもよい。アクティベートされたサービングセル/非サービングセルインデックス又はPCI(候補)は、新しいIDに対応していてもよい。
本開示の各例は、対応するUE能力(UE能力情報)が報告(送信)されたこと、又は対応する上位レイヤシグナリング(RRCパラメータ)の設定が行われたことの少なくとも一方に基づいて、適用されてもよい。UE能力は、例えば、以下の(1)~(5)であてもよいが、以下の例に限られず、本開示の各例をサポートするかを示すUE能力が用いられてもよい。
(2)L1/L2セル間モビリティにおいて、RRCにより設定可能な、CC毎(又は全てのCC全体、又はバンド毎の全てのCC全体)の非サービングセルからのTCI状態の数(又はサービングセルと非サービングセルの両方からのTCI状態の総数)がいくつであるか。なお、RRCにより設定されるTCI状態の数は、UEのメモリ機能に関連していてもよい。
(3)L1/L2セル間モビリティにおいて、MAC CEでアクティベート可能なCC毎(又は全てのCC間、又はバンド毎の全てのCC全体)の非サービングセルからのTCI状態の数(又はサービングセルと非サービングセルの両方からのTCI状態の総数)がいくつであるか。なお、MAC CEでアクティベートされたTCI状態の数は、UEの処理能力に関連していてもよい。
(4)CC毎(又はすべてのCC間、又はバンド毎の全てのCC間)のL1/L2セル間モビリティでUEがサポートできる非サービングセルの数(異なるPCIの数)。
(5)サービングセルのDCIレベルの動的変更がサポートされているかどうか。サポートされていない場合、UEは、サービングセルのMAC CEレベルの動的(DCIより遅い)変更のみをサポートできる。
以下、本開示の一実施形態に係る無線通信システムの構成について説明する。この無線通信システムでは、本開示の上記各実施形態に係る無線通信方法のいずれか又はこれらの組み合わせを用いて通信が行われる。
図8は、一実施形態に係る基地局の構成の一例を示す図である。基地局10は、制御部110、送受信部120、送受信アンテナ130及び伝送路インターフェース(transmission line interface)140を備えている。なお、制御部110、送受信部120及び送受信アンテナ130及び伝送路インターフェース140は、それぞれ1つ以上が備えられてもよい。
図9は、一実施形態に係るユーザ端末の構成の一例を示す図である。ユーザ端末20は、制御部210、送受信部220及び送受信アンテナ230を備えている。なお、制御部210、送受信部220及び送受信アンテナ230は、それぞれ1つ以上が備えられてもよい。
なお、上記実施形態の説明に用いたブロック図は、機能単位のブロックを示している。これらの機能ブロック(構成部)は、ハードウェア及びソフトウェアの少なくとも一方の任意の組み合わせによって実現される。また、各機能ブロックの実現方法は特に限定されない。すなわち、各機能ブロックは、物理的又は論理的に結合した1つの装置を用いて実現されてもよいし、物理的又は論理的に分離した2つ以上の装置を直接的又は間接的に(例えば、有線、無線などを用いて)接続し、これら複数の装置を用いて実現されてもよい。機能ブロックは、上記1つの装置又は上記複数の装置にソフトウェアを組み合わせて実現されてもよい。
なお、本開示において説明した用語及び本開示の理解に必要な用語については、同一の又は類似する意味を有する用語と置き換えてもよい。例えば、チャネル、シンボル及び信号(シグナル又はシグナリング)は、互いに読み替えられてもよい。また、信号はメッセージであってもよい。参照信号(reference signal)は、RSと略称することもでき、適用される標準によってパイロット(Pilot)、パイロット信号などと呼ばれてもよい。また、コンポーネントキャリア(Component Carrier(CC))は、セル、周波数キャリア、キャリア周波数などと呼ばれてもよい。
Claims (6)
- 物理セルIDに基づいて作成された、前記物理セルIDとは別の、サービングセル及び非サービングセルを示す特定のインデックスの設定を受信する受信部と、
設定された前記特定のインデックスに対応するチャネル状態情報報告の送信を制御する制御部と、
を有する端末。 - 前記受信部は、単一の送受信ポイント又は複数の送受信ポイントのセル間モビリティが適用される場合に、前記特定のインデックスに対応する送信設定指示(TCI)状態を受信する、
請求項1に記載の端末。 - 前記受信部は、サービングセルインデックス、非サービングセルインデックス、又は前記物理セルIDと前記特定のインデックスとの関係を、上位レイヤシグナリングにより受信する、
請求項1又は2に記載の端末。 - 前記受信部は、サービングセルインデックス、非サービングセルインデックス、又は前記物理セルIDの候補を上位レイヤシグナリングにより受信し、当該候補のうちの少なくとも1つをアクティベートするMedium Access Control Control Element(MAC CE)を受信し、
アクティベートされた前記候補は、前記特定のインデックスに対応する、
請求項1から3のいずれかに記載の端末。 - 物理セルIDに基づいて作成された、前記物理セルIDとは別の、サービングセル及び非サービングセルを示す特定のインデックスの設定を受信する工程と、
設定された前記特定のインデックスに対応するチャネル状態情報報告の送信を制御する工程と、
を有する端末の無線通信方法。 - 物理セルIDに基づいて作成された、前記物理セルIDとは別の、サービングセル及び非サービングセルを示す特定のインデックスの設定を送信する送信部と、
設定された前記特定のインデックスに対応するチャネル状態情報報告の受信を制御する制御部と、
を有する基地局。
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