WO2023276132A1 - 端末、無線通信方法及び基地局 - Google Patents
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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
- one object of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately perform transmission and reception with another cell having a physical cell ID different from the physical cell ID of the serving cell. .
- a terminal provides a first common to both downlink (DL) and uplink (UL) associated with another cell having a physical cell ID different from the physical cell ID of the serving cell.
- a receiver for receiving information indicating at least one of a Transmission Configuration Indication state (TCI) state, a second TCI state common to DL, a third TCI state common to UL; and a control unit that applies at least one of the first TCI state, the second TCI state, and the third TCI state to a specific channel for the other cell.
- TCI Transmission Configuration Indication state
- FIG. 1A and 1B are diagrams showing an example of a common beam.
- FIG. 2A shows an example of inter-cell mobility involving non-serving cells.
- FIG. 2B shows an example of a multi-TRP scenario.
- 3A and 3B are diagrams showing a first example of MAC CE.
- 4A and 4B are diagrams showing a second example of MAC CE.
- FIG. 5 is a diagram illustrating an example of a schematic configuration of a radio communication system according to an embodiment.
- FIG. 6 is a diagram illustrating an example of the configuration of a base station according to one embodiment.
- FIG. 7 is a diagram illustrating an example of the configuration of a user terminal according to one embodiment.
- FIG. 8 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 (TCI state) of that signal/channel.
- TCI state Transmission Configuration Indication state
- 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.
- 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 specifying TCI conditions or spatial relationships per channel as in 15, a common TCI condition (common beam) may be indicated and applied to all channels in the UL and DL, or for the UL Common TCI conditions may be applied to all channels on the UL and common TCI conditions for the DL may be applied to all channels on the DL.
- One common TCI state for both DL and UL, or a common TCI state for DL and a common TCI state for UL (two common TCI states in total) are considered.
- the UE may assume the same TCI state (joint TCI state, joint TCI pool, joint common TCI pool, joint TCI state set) 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).
- X (>1) TCI states may be activated by MAC CE.
- the UL/DL DCI may select 1 out of X 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.
- the number of TCI states corresponding to each of one or more TRPs may be defined. For example, the number N ( ⁇ 1) of TCI states (UL TCI states) applied to UL channels/RSs and the number M ( ⁇ 1) of TCI states (DL TCI states) applied to DL channels/RSs and may be defined. At least one of N and M may be signaled/configured/indicated to the UE via higher layer signaling/physical layer signaling.
- the UE has X UL and DL common TCI states (corresponding to X TRPs) (joint TCI status) is signaled/set/indicated.
- the UE is notified/configured/instructed of a TCI state common to multiple (two) UL and DL for multiple (two) TRPs (joint TCI state for multiple TRPs).
- multiple (two) UL TCI states and multiple (two) DL TCI states for multiple (two) TRPs State may mean signaled/set/indicated (separate TCI state for multiple TRPs).
- N and M are 1 or 2
- N and M may be 3 or more, and N and M may be different.
- 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_1/1_2 may be used to indicate common TCI status.
- a common TCI framework may have separate TCI states for DL and UL.
- Multi-TRP One or more Cells/Transmission/Reception Points (TRP) (Multi-TRP (MTRP)) are considered for DL transmission to the UE. Also, it is being considered that the UE makes UL transmissions to one or more cells/TRPs.
- the serving cell may be read as the TRP in the serving cell. L1/L2 signaling and MAC CE/DCI may be read interchangeably.
- a PCI that is different from the physical cell identity (PCI) of the current serving cell may be simply referred to as a "different PCI.” In Scenario 1, for example, the following procedure is performed.
- ⁇ Scenario 1> From the serving cell, the UE receives settings necessary for using radio resources for data transmission and reception, including SSB settings for beam measurement of TRPs having PCIs different from that of the serving cell, and resources for different PCIs. do. (2) The UE performs beam measurements for TRPs with different PCIs and reports beam measurement results to the serving cell. (3) Based on the above reports, TCI states associated with TRPs with different PCIs are activated by L1/L2 signaling from the serving cell. (4) UEs transmit and receive using UE dedicated channels on the TRP with different PCIs. (5) The UE should always cover the serving cell, even in the case of multi-TRP. The UE needs to use common channels (Broadcast Control Channel (BCCH), Paging Channel (PCH)) from the serving cell, etc., as in conventional systems.
- BCCH Broadcast Control Channel
- PCH Paging Channel
- Scenario 1 the 'serving cell' assumption is not changed when the UE transmits/receives signals to/from a non-serving cell/TRP (TRP with non-serving cell's PCI).
- the UE is configured with higher layer parameters related to PCI of non-serving cells from the serving cell.
- Scenario 1 is, for example, Rel. 17.
- Scenario 2 applies L1/L2 inter-cell mobility.
- L1/L2 inter-cell mobility allows serving cell changes using features such as beam control without RRC reconfiguration. In other words, it is possible to transmit to and receive from non-serving cells without handover. Since a data communication unavailable period occurs such as RRC reconnection is required for handover, data communication can be continued even when the serving cell is changed by applying L1/L2 inter-cell mobility that does not require handover. be able to.
- Scenario 2 is, for example, Rel. 18 may be applied. In Scenario 2, for example, the following procedure is performed.
- the UE receives from the serving cell the configuration of SSBs of cells with different PCIs (non-serving cells) for beam measurement/serving cell change.
- the UE performs beam measurements for cells using different PCIs and reports the measurement results to the serving cell.
- the UE may receive the configuration of cells with different PCIs (serving cell configuration) through higher layer signaling (eg, RRC). In other words, pre-configuration regarding serving cell change may be performed. This setting may be performed together with the setting in (1), or may be performed separately.
- the TCI states of cells with different PCIs may be activated by L1/L2 signaling according to the change of serving cell. Activating the TCI state and changing the serving cell may be done separately.
- the UE changes its serving cell and starts receiving/transmitting using the preconfigured UE-specific channel and TCI state.
- the serving cell assumption is updated by L1/L2 signaling.
- FIGS. 2A and 2B An example in which a UE receives channels/signals from multiple cells/TRPs in inter-cell mobility will be described using FIGS. 2A and 2B.
- 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).
- the UE is from the base station/TRP of cell #1 (PCI#1), which is the serving cell, and the base station/TRP of cell #3 (Non-serving cell), which is not the serving cell (Non-serving cell) It shows the case of receiving a channel/signal.
- PCI#1 the base station/TRP of cell #1
- Non-serving cell Non-serving cell
- the serving cell of the UE switches (eg, fast cell switch) from cell #1 to cell #3.
- TCI state updates may be performed by DCI/MAC CE and port (eg, antenna port)/TRP/point selection may be performed dynamically.
- 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.
- Non-Coherent Joint Transmission may be used as one form of multi-TRP transmission.
- NCJT may be performed between multiple cells (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.”
- SPS semi-persistent scheduling
- the inventors conceived of a terminal that can appropriately transmit and receive with other cells.
- A/B/C and “at least one of A, B and C” may be read interchangeably.
- cell, serving cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, band may be read interchangeably.
- index, ID, indicator, and resource ID may be read interchangeably.
- supporting, controlling, controllable, operating, and capable of operating may be read interchangeably.
- configure, activate, update, indicate, enable, specify, and select may be read interchangeably.
- 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
- RRC, RRC signaling, RRC parameters, higher layers, higher layer parameters, RRC information elements (IEs), RRC messages may be read interchangeably.
- 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
- MAC CE and activation/deactivation commands may be read interchangeably.
- pool, set, group, list, and candidate may be read interchangeably.
- DMRS Downlink Reference Signal
- DMRS port Downlink Reference Signal
- antenna port 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.
- common beam common TCI, common TCI state, unified TCI, unified TCI state, TCI state applicable to DL and UL, TCI state applicable to multiple (multiple types) of channels/RS, multiple types of The TCI states applicable to the channel/RS, PL-RS, may be interchanged.
- Common, unified, and joint 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.
- the panel Uplink (UL) transmitting entity, TRP, spatial relationship, control resource set (COntrol REsource SET (CORESET)), PDSCH, codeword, base station, antenna port of a signal (e.g., reference signal for demodulation (DeModulation Reference Signal (DMRS)) port), antenna port group for a 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), layers (MIMO layer, transmission layer, spatial layer) may be read interchangeably. Also, panel identifier (ID) and panel may be read interchangeably.
- DMRS DeModulation Reference Signal
- the TRP ID, the TRP related ID, the CORESET pool index, the position of one of the two TCI states corresponding to one codepoint of the field in the DCI (ordinal number, first TCI state or second TCI state ) and TRP may be read interchangeably.
- TRP transmission point
- panel DMRS port group
- CORESET pool one of two TCI states associated with one codepoint of the TCI field may be read interchangeably.
- CORESETPoolIndex CORESET Pool Index
- multiple TCI state/spatial relationships enabled by RRC/DCI and/or multi-TRP based on single DCI and multi-TRP based on multiple DCIs may be read interchangeably.
- multi-TRPs based on multi-DCI setting a CORESET pool index (CORESETPoolIndex) value of 1 for a CORESET, may be read interchangeably.
- multiple TRPs based on a single DCI, where at least one codepoint of a TCI field is mapped to two TCI states may be read interchangeably.
- TRP#1 first TRP
- TRP#2 second TRP
- TRP#1 first TRP
- TRP#2 second TRP
- cells, serving cells, CCs, BWPs, BWPs in CCs, and bands may be read interchangeably.
- cell non-serving cell
- cell with different PCI candidate serving cell
- cell with PCI different from current serving cell's PCI and another serving cell
- Dedicated and specific may be read interchangeably.
- a common TCI state may be a TCI state that is applicable to multiple types of channels/signals.
- the common TCI state is at least one of a first TCI state common to both downlink (DL) and uplink (UL), a second TCI state common to DL, and a third TCI state common to UL.
- the first TCI state may be a TCI state (joint TCI state) applicable to multiple types of DL and UL channels/signals.
- the second TCI state may be a TCI state applicable to multiple types of DL channels/signals (separate DL TCI state).
- the second TCI state may be a TCI state applicable to UL multiple types of channels/signals (separate UL TCI state).
- the information indicating the first TCI state is, for example, the MAC CE and DCI indications shown in FIG. 1A.
- the information indicating the second TCI state and the third TCI state is, for example, the MAC CE and DCI indications shown in FIG. 1B.
- the UE applies at least one of the first TCI state, the second TCI state, and the third TCI state indicated in the information to a specific channel transmitted/received to/from the other cell. do. This particular channel is at least one of CH1-CH9 below.
- CH1 may include the following CH1_DL/CH1_UL.
- CH1_DL PDSCH scheduled by a UE-dedicated CORESET/UE-specific Search Space (USS) (PDSCH scheduled by a PDCCH detected in that CORESET/USS).
- CH1_UL PUSCH scheduled by UE-specific CORESET/USS (PUSCH scheduled by PDCCH detected in this CORESET/USS).
- CH2: CH2 may include the following CH2_DL/CH2_UL.
- - CH2_DL UE specific PDCCH.
- - CH2_UL UE specific PUCCH.
- CH3: CH3 may include CH3_UL below.
- CH3_UL Type 1 CG PUSCH configured by higher layer signaling (eg RRC).
- CH4 may include the following CH4_DL/CH4_UL.
- CH4_DL SPS PDSCH configured by higher layer signaling (eg RRC) and activated by DCI.
- CH4_UL Type 2 CG PUSCH configured by higher layer signaling (eg RRC) and activated by DCI.
- CH5 Type 0 - PDCCH PDCCH detected in Common Search Space (CSS).
- CH6 PDCCH detected in Type 0A-PDCCH CSS.
- CH7 Type 1 - PDCCH detected in the PDCCH CSS.
- CH8 PDCCH detected in Type 2-PDCCH CSS.
- CH9 PDCCH detected in Type 3-PDCCH CSS.
- any of the following options 1-1 to 1-4 may be applied to applicable channels of the relevant TCI state.
- the TCI state is, for example, Rel. It may be a common TCI state as defined in X.17.
- “A/B/C” and “at least one of A, B and C” may be read interchangeably.
- “/” may be read as “and” or "or”.
- Channels to which the common TCI state (beam) can be applied are not limited to the above options (options 1-1/1-2/1-3/1-4), for example, a combination of two or more options, each option and other channels may be applied.
- CH5/CH6/CORESET#0 may not be allowed.
- CH7/CH8 may or may not be allowed.
- a separate DL/UL TCI state (at least one of a second TCI state common to DL, a third TCI state common to UL) associated with a cell with a PCI different from the PCI of the serving cell is MAC CE/ If indicated by DCI (see, for example, FIG. 1B), the channel applicable to the DL common TCI state (second TCI state), even if any of the following options 1-5 to 1-8 are applied good. Any of the following options 1-9 to 1-11 may be applied to channels to which the UL common TCI state (third TCI state) is applicable.
- Channels to which the DL common TCI state can be applied are not limited to the above options (options 1-5/1-6/1-7/1-8), for example, a combination of two or more options, each option and other with the DL channel may be applied.
- CH5/CH6/CORESET#0 may not be granted.
- CH7/CH8 may or may not be allowed.
- Channels to which the UL common TCI state can be applied are not limited to the above options (options 1-9/1-10/1-11), for example, a combination of two or more options, each option and other UL channels may be applied.
- the UE can receive PDSCH from cells with different PCIs, it needs to monitor at least SIB/paging and Random Access Response (RAR) from the serving cell. That is, the processing load on the UE increases. However, the processing load on the UE can be reduced by limiting channels for transmission and reception with cells having different PCIs.
- RAR Random Access Response
- ⁇ Second embodiment> In a second embodiment, implicit or explicit signaling for serving cell change indication is described.
- the TCI state of this embodiment at least one of the first TCI state, the second TCI state, and the third TCI state (joint TCI state or separate TCI state) in the first embodiment may be applied. .
- Aspect 2-1 describes implicit signaling for the serving cell change instruction. Scenario 2 described above, for example, is applied to aspect 2-1.
- a cell in which a specific control resource set (CORESET) (eg, at least one of CORESET #0, CH5 Type0-CSS CORESET, CH6/CH7/CH8 CSS CORESET) is different from the PCI of the serving cell (for a given CORESET, one or more TCI states associated with a cell with a different PCI than the serving cell's PCI (when directed/activated by the CE), the UE may decide to change the serving cell to another cell (cell x, a cell with a different PCI). That is, the activation may implicitly indicate a change of serving cell to another cell.
- CORESET eg, at least one of CORESET #0, CH5 Type0-CSS CORESET, CH6/CH7/CH8 CSS CORESET
- the UE may decide to change the serving cell to another cell (cell x, a cell with a different PCI). That is, the activation may implicitly indicate a change of serving cell to another cell.
- the UE may update beams of other CORESET IDs, other CORESETs using CH6/CH7/CH8, or other CORESETs using CSS to the same TCI state as the above activated TCI state. good.
- a MAC CE activates/deactivates a TCI state for the PDSCH, if all such TCI states activated by the MAC CE are associated with the same cell x with a PCI different from that of the serving cell, The UE may decide to change the serving cell to another cell (cell x). That is, the association may implicitly indicate a change of serving cell to another cell.
- the NW base station
- the MAC CE activates the PDSCH TCI state associated with a cell with a different PCI
- another cell for example, The TCI status associated with the current serving cell or a cell with a second, different PCI
- MAC CE activates/deactivates unified TCI states (e.g., corresponding to the unified TCI framework of Rel.17), and all activated unified TCI states are associated with the same cell x with different PCIs If so, the UE may decide to change the serving cell to another cell (cell x). That is, the association may implicitly indicate a change of serving cell to another cell.
- unified TCI states e.g., corresponding to the unified TCI framework of Rel.17
- Option 2-2/2-3 some of the active TCI states are associated with Cell#1/PCI#1 and other TCI states are associated with Cell#2/PCI#2. (referred to as a modified case), at least one of the following (1) to (3) may be applied.
- different TCI codepoints may indicate different cells/PCIs.
- the UE does not update (change) its serving cell assumption. However, the UE is able to transmit and receive signals to and from the non-serving cell/PCI (ie, corresponds to Scenario 1).
- a UE can be connected to multiple serving cells (a UE can assume multiple serving cells).
- a UE may transmit and receive signals to and from multiple serving cells/PCIs.
- the UE does not assume (expect) that different TCI codepoints are configured to indicate different cells/PCIs.
- the UE can dynamically switch between the two cells for PDSCH reception, similar to the mTRP configuration framework. Otherwise, the UE needs to maintain multiple serving cell configurations at the same time. For example, if the UE receives PDSCH from PCI #1, the UE uses the PDSCH configuration for PCI #1. When the UE receives the PDSCH from PCI#2, the UE uses the PDSCH configuration for PCI#2. The UE may maintain two user planes (U-plane) corresponding to the configuration.
- U-plane user planes
- the above variant case may occur (the UE assumes the above variant case). However, if different PCI cells have different serving cell settings (or at least individual PDSCH settings), the UE may not assume the variant case above.
- Aspect 2-2 describes explicit signaling for serving cell change indication. Scenario 2 described above, for example, is applied to aspect 2-2.
- the UE may determine to change the serving cell to another cell (non-serving cell) when receiving the MAC CE.
- the UE may also control transmission/reception of DL/UL signals with non-serving cells based on this information. Note that the number of the non-serving cells may be one or plural. In the example shown below, a MAC CE containing multiple fields indicating multiple non-serving cell indices is applied.
- Non-serving cell ID used for activation.
- the non-serving cell ID may be replaced with any information corresponding to the non-serving cell (that can identify the non-serving cell).
- any one of (3-1) to (3-5) may be applied.
- (3-1) PCI PCI used directly). For example, 10 bits are used.
- CSI-ReportConfigId CSI Report Configuration ID
- CSI-ResourceConfigId CSI resource configuration ID
- CSI-ResourceConfigId CSI resource configuration ID
- Bitmap indicating activation/deactivation of each non-serving cell.
- the bitmap size may be the same as the number of non-serving cells configured on this CC. For example, when activating the second non-serving cell among three non-serving cells, '010' is set.
- FIGS. 3A and 3B are diagrams showing a first example of MAC CE. 3A and 3B assume that there are 7 non-serving cells.
- FIGS. 3A and 3B each include fields (1) to (3) above.
- Non-serving cell ID (3-bit) may indicate one non-serving cell activated for L1 beam reporting.
- the number of bits of the non-serving cell ID may not be 3 bits, and may vary depending on the number of non-serving cells (maximum number).
- the "P” field may indicate whether or not the next octet (entry) exists.
- the 'P' field may indicate whether at least one of (1) to (3) is present in the MAC CE.
- FIG. 3A corresponds to one CC.
- FIG. 3B corresponds to multiple CCs and includes fields (1) to (3) and a “P” field for each CC.
- FIGS. 3A and 3B are diagrams illustrating a second example of MAC CE. 4A and 4B, unlike FIGS. 3A and 3B in that the non-serving cell ID (Non-serving cell ID (3-bit)) is replaced with 7 IDs (7-bit bitmap), other Points are similar.
- the 7 IDs correspond to (3-5) above, and each of the 7 IDs corresponds to a non-serving cell.
- the seven IDs are T 1 , T 2 . . . It may be expressed as T7 .
- FIG. 4A corresponds to one CC.
- FIG. 4B corresponds to multiple CCs and includes fields (1) to (3) and a “P” field for each CC.
- At least one of the information included in the MAC CE described above may be included in the DCI.
- at least one of the serving cells activated by MAC CE may be indicated by DCI.
- MAC CE/DCI includes a field indicating the TCI state/SSB/CSI-RS from cells with different PCI so that the UE can recognize the DL beam monitored on the target cell (serving cell after change). You can stay. The UE may use the TCI state/SSB/CSI-RS to create and transmit a beam report (CSI report).
- the MAC CE/DCI contains additional fields indicating the UL beam/TCI state/spatial relationship/SSB/CSI-RS/SRS of the target cell. You can stay.
- the UE may receive a MAC CE that adds a new 1-bit field 'C' to the existing MAC CE. This field indicates whether to change the serving cell.
- the UE may receive the MAC CE and determine whether to change the serving cell to another cell based on the field.
- the existing MAC CE has a field for instructing activation/deactivation of the TCI state of PDSCH, a field for instructing activation/deactivation of cells with different PCIs, beam measurement/deactivation of cells with different PCIs, At least one of fields indicating RS (eg, SSB) for reporting and other purposes/functions may be added.
- RS eg, SSB
- the number of cells associated/indicated with different PCIs within the MAC CE may be only 1 cell.
- Each field shown in this option may be applied in combination with either the existing MAC CE or the MAC CEs in FIGS. 3A, 3B, 4A, and 4B.
- MAC CE in option 2-4 additionally field indicating serving cell index/PCI/other ID (such as new ID in option 2-3 above), TCI state/SSB of target cell (serving cell after change)
- the /CSI-RS field may be included in the MAC CEs of FIGS. 3A, 3B, 4A, and 4B.
- the detailed design for supporting the change of the serving cell becomes clear, so the serving cell can be changed appropriately. That is, problem 2 above can be resolved.
- This embodiment describes the behavior of the UE after detecting an implicit/explicit serving cell change indication (eg, see the second embodiment).
- an implicit/explicit serving cell change indication eg, see the second embodiment.
- the TCI state of this embodiment at least one of the first TCI state, the second TCI state, and the third TCI state (joint TCI state or separate TCI state) in the first embodiment may be applied. .
- the UE changes the setting of the serving cell to the setting of the target cell (other cell, serving cell after change) based on the setting of multiple cells received in advance by higher layer signaling (eg, RRC).
- the configuration may be, for example, a CSI report configuration (CSI-ReportConfig), a CSI resource configuration (CSI-ResourceConfig), or the like.
- the UE flushes/clears the DL/UL configured resources of the serving cell before the change and reconstructs the DL/UL configured resources of the target cell.
- the UE may store the previous serving cell configuration in case a handover back occurs (the serving cell reverts to the previous serving cell).
- the UE receives DL transmission from the target cell using the new beam/TCI state according to the MAC CE indication (eg, TCI state (beam)/SSB/CSI-RS) about the target cell shown in the second embodiment. do. If there is no indication for that target cell, the new beam/TCI state may correspond to the latest PRACH transmission associated with the target cell's SSB.
- the MAC CE indication eg, TCI state (beam)/SSB/CSI-RS
- the UE may receive only CORESET#0 and at least one of CH5, CH6, CH7, CH8, CH9, CH1_DL, CH2_DL, and CH4_DL as the DL received from the target cell.
- the UE uses the new beam/TCI state/spatial relationship assumption according to the indications (TCI state (beam)/SSB/CSI-RS) on the target cell shown in the second embodiment, if they exist. and transmit the UL signal to the target cell. If there is no indication of the target cell's TCI state (beam) or UL TCI state (beam) in the second embodiment, the new beam/TCI state/spatial relationship corresponds to the latest PRACH transmission associated with the target cell's SSB You may have
- the UE may transmit at least one of CH1_UL, CH2_UL, CH3_UL, and CH4_UL as the UL transmitted to the target cell. Note that the UE may change only the DL beam of the target cell without changing the UL beam of the target cell.
- UL beams may be set from RRC configuration signaling.
- the operation of the UE after receiving the serving cell change instruction is clarified by L1/L2 inter-cell mobility. That is, problem 3 above is resolved.
- a UE may report (transmit) UE capability information indicating whether it supports at least one of the processes in this disclosure. For example, the UE may transmit at least one UE capability information of (1) to (3) below.
- the UE may receive information for instructing/setting at least one of the processes in the present disclosure through DCI/MAC CE/higher layer signaling or the like.
- the information may correspond to UE capability information sent by the UE.
- 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. 5 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. 6 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 receives a first Transmission Configuration Indication common to both the downlink (DL) and uplink (UL) associated with another cell having a physical cell ID different from the physical cell ID of the serving cell.
- Information may be sent indicating at least one of a state (TCI) state, a second TCI state common to DL, and a third TCI state common to UL.
- TCI state
- control unit 110 may control the transmission and/or reception of that particular channel.
- FIG. 7 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 receives a first Transmission Configuration Indication common to both the downlink (DL) and uplink (UL) associated with another cell having a physical cell ID different from the physical cell ID of the serving cell.
- Information may be received indicating at least one of a state (TCI) state, a second TCI state common to DL, and a third TCI state common to UL.
- TCI state
- the control unit 210 applies at least one of the first TCI state, the second TCI state, and the third TCI state indicated in the information to a specific channel for the other cell. good too.
- the control unit 210 changes the serving cell to the other cell. You can decide to change.
- the transmitting/receiving unit 220 may receive a Medium Access Control Control Element (MAC CE) including a field indicating whether to change the serving cell.
- MAC CE Medium Access Control Control Element
- the controller 210 may determine whether to change the serving cell to the other cell based on the field.
- the control unit 210 may change the setting of the serving cell to the setting of the other cell based on the setting received by higher layer signaling.
- 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. 8 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
- any reference to elements using the "first,” “second,” etc. designations used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, references to first and second elements do not imply that only two elements may be employed or that the first element must precede the second element in any way.
- 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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- Computer Networks & Wireless Communication (AREA)
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- Mobile Radio Communication Systems (AREA)
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/チャネルの送信設定指示状態(Transmission Configuration Indication state(TCI状態))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TCI状態(共通ビーム)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TCI状態をULの全てのチャネルに適用し、DL用の共通TCI状態をDLの全てのチャネルに適用してもよい。
1つ又は複数のセル/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つ又は複数のセル/TRPに対してUL送信を行うことが検討されている。この場合の手順として、以下のシナリオ1又はシナリオ2が考えられる。なお、本開示において、サービングセルは、サービングセル内のTRPに読み替えられてもよい。L1/L2シグナリング、MAC CE/DCIは、互いに読み替えられてもよい。本開示において、現在のサービングセルの物理セルID(Physical Cell Identity(PCI))とは異なるPCIを、単に「異なるPCI」と記載することがある。シナリオ1では、例えば、以下の手順が行われる。
(1)UEは、サービングセルから、当該サービングセルとは異なるPCIを有するTRPのビーム測定用のSSBの設定、及び異なるPCIのリソースを含む、データ送受信に無線リソースを使用するために必要な設定を受信する。
(2)UEは、異なるPCIを有するTRPのビーム測定を実行し、ビーム測定結果をサービングセルに報告する。
(3)上記の報告に基づいて、異なるPCIを有するTRPに関連付けられたTCI状態が、サービングセルからのL1/L2シグナリングによって、アクティブ化される。
(4)UEは、異なるPCIを有するTRP上のUE個別(dedicated)チャネルを使用して送受信する。
(5)UEは、マルチTRPの場合も含めて、常にサービングセルをカバーしている必要がある。UEは、従来システムと同様に、サービングセルからの共通チャネル(ブロードキャスト制御チャネル(BCCH:Broadcast Control Channel)、ページングチャネル(PCH:Paging Channel))などを使用する必要がある。
シナリオ2では、L1/L2セル間モビリティを適用する。L1/L2セル間モビリティでは、RRC再設定せずに、ビーム制御などの機能を用いてサービングセル変更が可能である。言い換えると、ハンドオーバーせずに、非サービングセルとの送受信が可能である。ハンドオーバーのためにはRRC再接続が必要になるなど、データ通信不可期間が生じるので、ハンドオーバー不要なL1/L2セル間モビリティを適用することにより、サービングセル変更の際にもデータ通信を継続することができる。シナリオ2は、例えば、Rel.18において適用されてもよい。シナリオ2では、例えば、以下の手順が行われる。
(2)UEは、異なるPCIを使用したセルのビーム測定を実行し、測定結果をサービングセルに報告する。
(3)UEは、異なるPCIを持つセルの設定(サービングセル設定)を、上位レイヤシグナリング(例えばRRC)によって受信してもよい。つまり、サービングセル変更に関する事前設定が行われてもよい。この設定は、(1)における設定とともに行われてもよいし、別々に行われてもよい。
(4)上記の報告に基づいて、異なるPCIを持つセルのTCI状態は、サービングセルの変更に従ってL1/L2シグナリングによってアクティブ化されてもよい。TCI状態のアクティブ化及びサービングセルの変更は、別々に行われてもよい。
(5)UEは、サービングセルを変更し、予め設定されたUE個別のチャネルとTCI状態を使用して受信/送信を開始する。
サービングセルの物理セルIDとは異なる物理セルIDを有する他のセル(非サービングセル)を含むセル間モビリティが適用される場合において、他のセルとの送受信を実施する際の処理が明確になっていない。これにより、他のセルとの送受信を適切に行うことができず、スループットが低下又は通信品質が劣化するおそれがある。例えば、以下のような問題点が挙げられる。
L1/L2セル間モビリティにおいて、ビーム指示は、統一(共通)TCIフレームワークに基づくことが検討されている。しかし、異なるPCIのセルに関連付けられた共通のTCI状態がMAC CE及び/又はDCIによって示される場合、どのチャネルに共通のTCI状態(ビーム)を適用可能であるかが明確ではない。例えば、UE個別のCORESETに関連付けられたPDSCH/PUSCH、UE個別のPDCCH/PUCCH、いくつかのグループ共通PDCCH、セミパーシステントスケジューリング(semi-persistent scheduling(SPS)) PDSCH/セルグループ(Cell Group(CG)) PUSCHなどに対して、共通のTCI状態が適用可能であるかどうかが明らかになっていない。
例えば、Rel.17では、サービングセルの変更がなく(シナリオ1)、Rel.18では、サービングセルの変更がL1/L2セル間モビリティによりサポートされることが考えられる。しかし、サービングセルの変更をサポートするための詳細な設計(シグナリング設計など)が明らかになっていない。
L1/L2セル間モビリティによりサービングセル変更指示を受信した後のUEの動作が明確になっていない。
<第1の実施形態>
サービングセルの物理セルID(PCI)とは異なるPCIを持つ他のセルに関連付けられた共通TCI状態を指示する情報を受信する。共通TCI状態は、複数種類のチャネル/信号に適用可能なTCI状態であってもよい。共通TCI状態は、下りリンク(DL)及び上りリンク(UL)の両方に共通な第1のTCI状態、DLに共通な第2のTCI状態、ULに共通な第3のTCI状態の少なくとも1つであってもよい。第1のTCI状態は、DL及びULの複数種類のチャネル/信号に適用可能なTCI状態(ジョイントTCI状態)であってもよい。第2のTCI状態は、DLの複数種類のチャネル/信号に適用可能なTCI状態(セパレートDL TCI状態)であってもよい。第2のTCI状態は、ULの複数種類のチャネル/信号に適用可能なTCI状態(セパレートUL TCI状態)であってもよい。第1のTCI状態を指示する情報は、例えば図1Aに示す、MAC CE及びDCIによる指示である。第2のTCI状態、第3のTCI状態を指示する情報は、例えば図1Bに示す、MAC CE及びDCIによる指示である。UEは、当該情報において指示された、第1のTCI状態、第2のTCI状態、第3のTCI状態の少なくとも1つを、当該他のセルに対して送信/受信される特定のチャネルに適用する。この特定のチャネルは、以下のCH1~CH9の少なくとも1つである。
・CH1_DL:UE個別(dedicated)のCORESET/UE固有のサーチスペース(UE-specific Search Space(USS))によりスケジュールされるPDSCH(当該CORESET/USSにおいて検出されたPDCCHによりスケジュールされるPDSCH)。
・CH1_UL:UE個別のCORESET/USSによりスケジュールされるPUSCH(当該CORESET/USSにおいて検出されたPDCCHによりスケジュールされるPUSCH)。
CH2:CH2は以下のCH2_DL/CH2_ULを含んでもよい。
・CH2_DL:UE個別のPDCCH。
・CH2_UL:UE個別のPUCCH。
CH3:CH3は以下のCH3_ULを含んでもよい。
・CH3_UL:上位レイヤシグナリング(例えばRRC)により設定されるタイプ1 CG PUSCH。
CH4:CH4は以下のCH4_DL/CH4_ULを含んでもよい。
・CH4_DL:上位レイヤシグナリング(例えばRRC)により設定されDCIによりアクティベートされたSPS PDSCH。
・CH4_UL:上位レイヤシグナリング(例えばRRC)により設定されDCIによりアクティベートされたタイプ2 CG PUSCH。
CH5:タイプ0-PDCCH 共有サーチスペース(Common Search Space:CSS)において検出されたPDCCH。
CH6:タイプ0A-PDCCH CSSにおいて検出されたPDCCH。
CH7:タイプ1-PDCCH CSSにおいて検出されたPDCCH。
CH8:タイプ2-PDCCH CSSにおいて検出されたPDCCH。
CH9:タイプ3-PDCCH CSSにおいて検出されたPDCCH。
サービングセルのPCIとは異なるPCIを持つセルに関連付けられたジョイントDL/UL TCI状態(DL及びULの両方に共通な第1のTCI状態)がMAC CE/DCIによって指示される場合(例えば、図1A参照)、当該TCI状態の適用可能なチャネルは次のオプション1-1~1-4のいずれかが適用されてもよい。なお、当該TCI状態は、例えばRel.17において規定される共通TCI状態であってもよい。本開示において、「A/B/C」、「A、B及びCの少なくとも1つ」、は互いに読み替えられてもよい。「/」は、「及び」又は「又は」に読み替えられてもよい。
[オプション1-2]CH1/CH2
[オプション1-3]CH1/CH2/CH3/CH4
[オプション1-4]CH1/CH2/CH9
サービングセルのPCIとは異なるPCIを持つセルに関連付けられたセパレートDL/UL TCI状態(DLに共通な第2のTCI状態、ULに共通な第3のTCI状態の少なくとも1つ)が、MAC CE/DCIによって示される場合(例えば、図1B参照)、DL共通TCI状態(第2のTCI状態)を適用可能なチャネルは、以下の1-5~1-8のいずれかのオプションが適用されてもよい。UL共通TCI状態(第3のTCI状態)を適用可能なチャネルは、以下の1-9~1-11のいずれかのオプションが適用されてもよい。
[オプション1-6]CH1_DL/CH2_DL
[オプション1-7]CH1_DL/CH2_DL/CH4_DL
[オプション1-8]CH1_DL/CH2_DL/CH9
[オプション1-10]CH1_UL/CH2_UL
[オプション1-11]CH1_UL/CH2_UL/CH3_UL/CH4_UL
第2の実施形態では、サービングセル変更指示のための暗黙的な(Implicit)又は明示的な(explicit)シグナリングについて、説明する。本実施形態のTCI状態として、第1の実施形態における第1のTCI状態、第2のTCI状態、第3のTCI状態の少なくとも1つ(ジョイントTCI状態又はセパレートTCI状態)が適用されてもよい。
態様2-1では、サービングセル変更指示のための暗黙的な(Implicit)シグナリングについて、説明する。態様2-1は、例えば上述のシナリオ2が適用される。
特定の制御リソースセット(Control Resource Set(CORESET))(例えば、CORESET#0、CH5 Type0-CSSのCORESET、CH6/CH7/CH8 CSSのCORESETの少なくとも1つ)が、サービングセルのPCIと異なるPCIのセルに関連付けられた1つ以上のTCI状態とともにMAC CEにより指示(アクティブ化)される場合(特定のCORESETに対し、サービングセルのPCIと異なるPCIのセルに関連付けられた1つ以上のTCI状態が、MAC CEによって指示/アクティブ化される場合)に、UEは、サービングセルを他のセル(セルx、異なるPCIを持つセル)に変更すると判断してもよい。つまり、このアクティブ化が、サービングセルを他のセルに変更することを暗黙的に示していてもよい。
MAC CEがPDSCHのTCI状態をアクティブ化/非アクティブ化するとき、MAC CEによってアクティブ化された全ての当該TCI状態が、サービングセルのPCIと異なるPCIを持つ同じセルxに関連付けられている場合に、UEは、サービングセルを他のセル(セルx)に変更すると判断してもよい。つまり、この関連付けが、サービングセルを他のセルへ変更することを暗黙的に示していてもよい。
MAC CEが統一TCI状態(例えばRel.17の統一TCIフレームワークに対応する)をアクティブ化/非アクティブ化し、アクティブ化された全ての統一TCI状態が、異なるPCIを持つ同じセルxに関連付けられている場合に、UEは、サービングセルを他のセル(セルx)に変更すると判断してもよい。つまり、この関連付けが、サービングセルを他のセルへ変更することを暗黙的に示していてもよい。
オプション2-2/2-3において、アクティブなTCI状態のうちの一部のTCI状態がCell#1/PCI#1に関連付けられ、他のTCI状態が、Cell#2/PCI#2に関連付けられている場合(変形例のケースと称する)、以下の(1)~(3)の少なくとも1つが適用されてもよい。例えば、異なるTCIコードポイントが、異なるセル/PCIを示してもよい。
態様2-2では、サービングセル変更指示のための明示的な(explicit)シグナリングについて、説明する。態様2-2は、例えば上述のシナリオ2が適用される。
以下、サービングセル変更指示の例を説明する。なお、非サービングセルのアクティブ化/非アクティブ化、サービングセルの変更、サービングセルの物理セルIDとは異なる物理セルIDを持つ他のセル(非サービングセル)と送信/受信することは互いに読み替えられてもよい。
(2)BWP ID。
(3)アクティベーションに用いる非サービングセルID。非サービングセルIDは、非サービングセルに対応する(非サービングセルを識別可能な)任意の情報に置き換えられてもよい。
(3-1)PCI(直接用いられるPCI)。例えば、10ビットが使用される。
(3-2)非サービングセルの再作成インデックス(新しいID)。新しいIDは、PCIの一部に関連づけられ、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。新しいIDは、PCIよりもビット数を削減することができる。
(3-3)CSI報告設定ID(CSI-ReportConfigId)(CSI-ReportConfigが1つ又は複数の非サービングセルに対応する場合)。
(3-4)CSIリソース設定ID(CSI-ResourceConfigId)(CSI-ResourceConfigIdが1つ又は複数の非サービングセルに対応する場合)。
(3-5)各非サービングセルのアクティブ化/非アクティブ化を示すビットマップ。ビットマップのサイズ(ビット数)は、このCC上で設定された非サービングセルの数と同じであってもよい。例えば、3つの非サービングセルのうち、2番目の非サービングセルをアクティブ化する場合、「010」が設定される。
UEは、既存のMAC CEに新しい1ビットのフィールド「C」を追加したMAC CEを受信してもよい。当該フィールドは、サービングセルの変更を行うかどうかを示す。UEは、当該MAC CEを受信し、当該フィールドに基づいて、サービングセルを他のセルに変更するかを判断してもよい。
オプション2-4におけるMAC CEに対して、さらに、サービングセルインデックス/PCI/その他のID(上述のオプション2-3の新しいIDなど)を示すフィールド、ターゲットセル(変更後のサービングセル)のTCI状態/SSB/CSI-RSのフィールドを、図3A,図3B,図4A,図4BのMAC CEに含めてもよい。
本実施形態では、暗黙的/明示的なサービングセル変更指示(例えば、第2の実施形態参照)を検出した後のUEの動作を説明する。本実施形態のTCI状態として、第1の実施形態における第1のTCI状態、第2のTCI状態、第3のTCI状態の少なくとも1つ(ジョイントTCI状態又はセパレートTCI状態)が適用されてもよい。
UEは、本開示における各処理の少なくとも1つをサポートするかを示すUE能力情報を報告(送信)してもよい。例えば、UEは、以下の(1)~(3)の少なくとも1つのUE能力情報を送信してもよい。
(2)L1/L2(MAC CE/DCIを用いた)サービングセル変更後の、UEによる自動のDLビーム(TCI状態)更新をサポートするかどうか。
(3)L1/L2(MAC CE/DCIを用いた)サービングセル変更後の、UEによる自動のULビーム(TCI状態)更新をサポートするかどうか。
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6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7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)
- サービングセルの物理セルIDとは異なる物理セルIDを持つ他のセルに関連付けられた、下りリンク(DL)及び上りリンク(UL)の両方に共通な第1のTransmission Configuration Indication state(TCI)状態、DLに共通な第2のTCI状態、ULに共通な第3のTCI状態の少なくとも1つを指示する情報を受信する受信部と、
前記情報において指示された、前記第1のTCI状態、前記第2のTCI状態、前記第3のTCI状態の少なくとも1つを、前記他のセルに対する特定のチャネルに適用する制御部と、
を有する端末。 - 前記制御部は、前記第1のTCI状態、前記第2のTCI状態、前記第3のTCI状態の少なくとも1つが特定の制御リソースセットに対して指示された場合、前記サービングセルを前記他のセルに変更すると判断する
請求項1に記載の端末。 - 前記受信部は、前記サービングセルの変更を行うかどうかを示すフィールドを含むMedium Access Control Control Element(MAC CE)を受信し、
前記制御部は、前記フィールドに基づいて、前記サービングセルを前記他のセルに変更するかを判断する
請求項1又は2に記載の端末。 - 前記制御部は、上位レイヤシグナリングにより受信した設定に基づいて、前記サービングセルの設定を前記他のセルの設定に変更する
請求項1から3のいずれかに記載の端末。 - サービングセルの物理セルIDとは異なる物理セルIDを持つ他のセルに関連付けられた、下りリンク(DL)及び上りリンク(UL)の両方に共通な第1のTransmission Configuration Indication state(TCI)状態、DLに共通な第2のTCI状態、ULに共通な第3のTCI状態の少なくとも1つを指示する情報を受信する工程と、
前記情報において指示された、前記第1のTCI状態、前記第2のTCI状態、前記第3のTCI状態の少なくとも1つを、前記他のセルに対する特定のチャネルに適用する工程と、
を有する端末の無線通信方法。 - サービングセルの物理セルIDとは異なる物理セルIDを持つ他のセルに関連付けられた、下りリンク(DL)及び上りリンク(UL)の両方に共通な第1のTransmission Configuration Indication state(TCI)状態、DLに共通な第2のTCI状態、ULに共通な第3のTCI状態の少なくとも1つを指示する情報を送信する送信部と、
前記情報において指示された、前記第1のTCI状態、前記第2のTCI状態、前記第3のTCI状態の少なくとも1つが、前記他のセルに対する特定のチャネルに適用された場合、当該特定のチャネルの送信及び受信の少なくとも一方を制御する制御部と、
を有する基地局。
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