WO2021106169A1 - 端末及び無線通信方法 - Google Patents
端末及び無線通信方法 Download PDFInfo
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- WO2021106169A1 WO2021106169A1 PCT/JP2019/046665 JP2019046665W WO2021106169A1 WO 2021106169 A1 WO2021106169 A1 WO 2021106169A1 JP 2019046665 W JP2019046665 W JP 2019046665W WO 2021106169 A1 WO2021106169 A1 WO 2021106169A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0094—Indication of how sub-channels of the path are allocated
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0868—Hybrid systems, i.e. switching and combining
- H04B7/088—Hybrid systems, i.e. switching and combining using beam selection
Definitions
- the present disclosure relates to terminals and wireless communication methods 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).
- a successor system to LTE for example, 5th generation mobile communication system (5G), 5G + (plus), New Radio (NR), 3GPP Rel.15 or later, etc.) is also being considered.
- 5G 5th generation mobile communication system
- 5G + plus
- NR New Radio
- 3GPP Rel.15 or later, etc. is also being considered.
- user terminals In future wireless communication systems (eg, NR), user terminals (user terminals, User Equipment (UE)) will control transmission / reception processing based on information about pseudo-collocation (Quasi-Co-Location (QCL)). Is being considered.
- QCL Quad-Co-Location
- one or more transmission / reception points (Transmission / Reception Point (TRP)) (multi-TRP) transmit DL to the UE using one or more panels (multi-panel) (for example, PDSCH transmission) is being considered.
- TRP Transmission / Reception Point
- the QCL parameter when the multi-panel / TRP is used cannot be appropriately determined. If the QCL parameters cannot be determined appropriately, system performance may deteriorate, such as a decrease in throughput.
- one of the purposes of the present disclosure is to provide a terminal and a wireless communication method for appropriately determining QCL parameters for a multi-panel / TRP.
- a terminal includes a receiver that receives one downlink control information (DCI) for scheduling two physical downlink shared channels (PDSCH) and a if transmission setting instruction (TCI) field.
- DCI downlink control information
- TCI transmission setting instruction
- the QCL parameters for the multi-panel / TRP can be appropriately determined.
- FIG. 1 is a diagram showing an example of QCL assumption of the DMRS port of PDSCH.
- FIG. 2A-2D is a diagram showing an example of a multi-TRP scenario.
- FIG. 3 is a diagram showing an example of PDSCH repetition from the multi-TRP.
- FIG. 4 is a diagram showing an example of the scheme 1a of PDSCH repetition.
- 5A and 5B are diagrams showing an example of the scheme 2a of PDSCH repetition.
- 6A and 6B are diagrams showing an example of the scheme 2b of PDSCH repetition.
- 7A and 7B are diagrams showing an example of schemes 3 and 4 of PDSCH repetition.
- 8A and 8B are diagrams showing an example of a method for determining the QCL parameter of the multi-PDSCH.
- FIG. 9A and 9B are diagrams showing an example of the association between the TCI code point and the TCI state ID.
- FIG. 10 is a diagram showing an example of mapping of two TCI states in Scheme 1a.
- 11A and 11B are diagrams showing an example of mapping of two TCI states in scheme 2a or 2b.
- 12A and 12B are diagrams showing an example of mapping of two TCI states in Scheme 3 or 4.
- FIG. 13 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.
- FIG. 14 is a diagram showing an example of the configuration of the base station according to the embodiment.
- FIG. 15 is a diagram showing an example of the configuration of the user terminal according to the embodiment.
- FIG. 16 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment.
- reception processing for example, reception, demapping, demodulation, etc.
- transmission processing e.g., at least one of transmission, mapping, precoding, modulation, and coding
- the TCI state may represent what applies to the downlink signal / channel.
- the equivalent of the TCI state applied to the uplink signal / channel may be expressed as a spatial relation.
- the TCI state is information related to signal / channel pseudo collocation (Quasi-Co-Location (QCL)), and may be called spatial reception parameters, spatial relation information, or the like.
- the TCI state may be set on the UE on a channel-by-channel or signal-by-signal basis.
- QCL is an index showing the statistical properties of signals / channels. For example, when one signal / channel and another signal / channel have a QCL relationship, Doppler shift, Doppler spread, and average delay are performed between these different signals / channels. ), Delay spread, and spatial parameter (for example, spatial Rx parameter) can be assumed to be the same (QCL for at least one of these). You may.
- the spatial reception parameter may correspond to the received beam of the UE (for example, the received analog beam), or the beam may be specified based on the spatial QCL.
- the QCL (or at least one element of the QCL) in the present disclosure may be read as sQCL (spatial QCL).
- QCL types A plurality of types (QCL types) may be specified for the QCL.
- QCL types AD QCL types with different parameters (or parameter sets) that can be assumed to be the same may be provided, and the parameters (may be referred to as QCL parameters) are shown below:
- QCL Type A QCL-A
- QCL-B Doppler shift and Doppler spread
- QCL type C QCL-C
- QCL-D Spatial reception parameter.
- the UE may assume that one control resource set (Control Resource Set (CORESET)), channel, or reference signal has a specific QCL (eg, QCL type D) relationship with another CORESET, channel, or reference signal.
- QCL assumption QCL assumption
- the UE may determine at least one of the transmission beam (Tx beam) and the reception beam (Rx beam) of the signal / channel based on the TCI state of the signal / channel or the QCL assumption.
- the TCI state may be, for example, information about the QCL of the target channel (in other words, the reference signal (Reference Signal (RS)) for the channel) and another signal (for example, another RS). ..
- the TCI state may be set (instructed) by higher layer signaling, physical layer signaling, or a combination thereof.
- the upper layer signaling may be, for example, any one of 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
- PDU MAC Protocol Data Unit
- the broadcast information includes, for example, a master information block (Master Information Block (MIB)), a system information block (System Information Block (SIB)), a minimum system information (Remaining Minimum System Information (RMSI)), and other system information ( Other System Information (OSI)) may be used.
- MIB Master Information Block
- SIB System Information Block
- RMSI Minimum System Information
- OSI Other System Information
- the physical layer signaling may be, for example, downlink control information (DCI).
- DCI downlink control information
- the channels for which the TCI state or spatial relationship is set are, for example, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), and an uplink shared channel (Physical Uplink Shared). 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
- PDCH Downlink Control Channel
- PUSCH Physical Uplink Control Channel
- PUCCH Physical Uplink Control Channel
- the RS having a QCL relationship with the channel is, for example, a synchronization signal block (Synchronization Signal Block (SSB)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), and a measurement reference signal (Sounding). It may be at least one of Reference Signal (SRS)), CSI-RS for tracking (also referred to as Tracking Reference Signal (TRS)), and reference signal for QCL detection (also referred to as QRS).
- SSB Synchronization Signal Block
- CSI-RS Channel State Information Reference Signal
- Sounding Sounding
- SRS Reference Signal
- TRS Tracking Reference Signal
- QRS reference signal for QCL detection
- the SSB is a signal block including at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)), a secondary synchronization signal (Secondary Synchronization Signal (SSS)), and a broadcast channel (Physical Broadcast Channel (PBCH)).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- PBCH Physical Broadcast Channel
- the SSB may be referred to as an SS / PBCH block.
- the UE may receive setting information (for example, PDSCH-Config, tci-StatesToAddModList) including a list of information elements of the TCI state by upper layer signaling.
- setting information for example, PDSCH-Config, tci-StatesToAddModList
- the TCI state information element (RRC "TCI-state IE") set by the upper layer signaling may include a TCI state ID and one or more QCL information ("QCL-Info").
- the QCL information may include at least one of information related to the RS having a QCL relationship (RS-related information) and information indicating the QCL type (QCL type information).
- RS-related information includes RS index (for example, SSB index, non-zero power CSI-RS (Non-Zero-Power (NZP) CSI-RS) resource ID (Identifier)), cell index where RS is located, and RS position.
- Information such as the index of the Bandwidth Part (BWP) to be used may be included.
- both QCL type A RS and QCL type D RS, or only QCL type A RS can be set for the UE.
- TRS When TRS is set as the RS of QCL type A, it is assumed that the same TRS is periodically transmitted over a long period of time, unlike the PDCCH or PDSCH demodulation reference signal (DeModulation Reference Signal (DMRS)). Will be done.
- DMRS DeModulation Reference Signal
- the UE can measure the TRS and calculate the average delay, delay spread, and so on.
- a UE in which the TRS is set as the QCL type A RS in the TCI state of the PDCCH or PDSCH DMRS has the same parameters (average delay, delay spread, etc.) of the PDCCH or PDSCH DMRS and the TRS QCL type A. Since it can be assumed that there is, the parameters (average delay, delay spread, etc.) of DMRS of PDCCH or PDSCH can be obtained from the measurement result of TRS.
- the UE can perform more accurate channel estimation by using the measurement result of the TRS.
- a UE set with a QCL type D RS can determine a UE reception beam (spatial domain reception filter, UE spatial domain reception filter) using the QCL type D RS.
- a TCI-state QCL type X RS may mean an RS that has a QCL type X relationship with a channel / signal (DMRS), and this RS is called the TCI-state QCL type X QCL source. You may.
- DMRS channel / signal
- TCI state for PDCCH Information about the QCL between the PDCCH (or DMRS antenna port associated with the PDCCH) and an RS may be referred to as the TCI state for the PDCCH or the like.
- the UE may determine the TCI state for the UE-specific PDCCH (CORESET) based on the upper layer signaling. For example, for the UE, one or more (K) TCI states may be set by RRC signaling for each CORESET.
- CORESET UE-specific PDCCH
- the UE may activate one of the plurality of TCI states set by RRC signaling for each CORESET by MAC CE.
- the MAC CE may be called a TCI state indicating MAC CE (TCI State Indication for UE-specific PDCCH MAC CE) for UE-specific PDCCH.
- the UE may monitor the CORESET based on the active TCI state corresponding to the CORESET.
- TCI state for PDSCH Information about the QCL between the PDSCH (or DMRS antenna port associated with the PDSCH) and a DL-RS may be referred to as the TCI state for the PDSCH or the like.
- the UE may notify (set) M (M ⁇ 1) TCI states (QCL information for M PDSCHs) for PDSCH by higher layer signaling.
- the number M of TCI states set in the UE may be limited by at least one of the UE capability and the QCL type.
- the DCI used for scheduling the PDSCH may include a field indicating the TCI state for the PDSCH (for example, it may be called a TCI field, a TCI state field, or the like).
- the DCI may be used for scheduling the PDSCH of one cell, and may be called, for example, DL DCI, DL assignment, DCI format 1_0, DCI format 1-1-1 and the like.
- Whether or not the TCI field is included in the DCI may be controlled by the information notified from the base station to the UE.
- the information may be information indicating whether or not a TCI field exists in DCI (present or present) (for example, TCI field existence information, TCI existence information in DCI, upper layer parameter TCI-PresentInDCI).
- the information may be set in the UE by, for example, higher layer signaling.
- TCI states When more than 8 types of TCI states are set in the UE, 8 or less types of TCI states may be activated (or specified) using MAC CE.
- the MAC CE may be referred to as a UE-specific PDSCH TCI state activation / deactivation MAC CE (TCI States Activation / Deactivation for UE-specific PDSCH MAC CE).
- TCI States Activation / Deactivation for UE-specific PDSCH MAC CE The value of the TCI field in DCI may indicate one of the TCI states activated by MAC CE.
- the UE When the UE sets the TCI field existence information set to "enabled” for the CORESET that schedules the PDSCH (CORESET used for PDCCH transmission that schedules the PDSCH), the UE is set to the TCI field. , It may be assumed that it exists in the DCI format 1-11 of the PDCCH transmitted on the CORESET.
- the UE Corresponds to the reception of DL DCI (DCI that schedules the PDSCH) and the DCI when the TCI field existence information is not set for the CORESET that schedules the PDSCH or the PDSCH is scheduled in the DCI format 1_0. If the time offset between the reception of the PDSCH is greater than or equal to the threshold, the UE uses the TCI state or QCL assumption for the PDSCH to schedule the PDSCH transmission to determine the QCL of the PDSCH antenna port. It may be assumed that it is the same as the TCI state or QCL assumption applied to the CORESET.
- the TCI field in the DCI in the component carrier (CC) that schedules (PDSCH) will be the activated TCI in the scheduled CC or DL BWP.
- the UE uses a TCI that has a DCI and follows the value of the TCI field in the detected PDCCH to determine the QCL of the PDSCH antenna port. You may.
- the UE performs the PDSCH of the serving cell. It may be assumed that the DM-RS ports are RSs and QCLs in the TCI state with respect to the QCL type parameters given by the indicated TCI state.
- the indicated TCI state may be based on the activated TCI state in the slot with the scheduled PDSCH. If the UE is configured with multiple slot PDSCHs, the indicated TCI state may be based on the activated TCI state in the first slot with the scheduled PDSCH, and the UE may span the slots with the scheduled PDSCH. You may expect them to be the same. If the UE is configured with a CORESET associated with a search space set for cross-carrier scheduling, the UE will set the TCI field presence information to "valid" for that CORESET and in the serving cell scheduled by the search space set. If at least one of the TCI states set relative to it contains a QCL type D, the UE assumes that the time offset between the detected PDCCH and the PDCCH corresponding to that PDCCH is greater than or equal to the threshold. May be good.
- the DL DCI In the RRC connection mode, the DL DCI (PDSCH) is set both when the TCI information in the DCI (upper layer parameter TCI-PresentInDCI) is set to "enabled” and when the TCI information in the DCI is not set. If the time offset between the receipt of the scheduled DCI) and the corresponding PDSCH (the PDSCH scheduled by the DCI) is less than the threshold, the UE will have the DM-RS port of the PDSCH of the serving cell of the serving cell.
- One or more CORESETs in the active BWP have the smallest (lowest) CORESET-ID in the latest (latest) slot monitored by the UE and are in the monitored search space.
- the associated CORESET is an RS and a QCL with respect to the QCL parameters used to indicate the PDCCH's QCL (FIG. 1).
- This RS may be referred to as the PDSCH default TCI state or the PDSCH default QCL assumption.
- the time offset between the reception of the DL DCI and the reception of the PDSCH corresponding to the DCI may be referred to as a scheduling offset.
- thresholds are QCL time duration, "timeDurationForQCL”, “Threshold”, “Threshold for offset between a DCI indicating a TCI state and a PDSCH scheduled by the DCI", “Threshold-Sched-Offset”. , Schedule offset threshold, scheduling offset threshold, and the like.
- the QCL time length may be based on the UE capability, for example, the delay required for PDCCH decoding and beam switching.
- the QCL time length may be the minimum time required for the UE to perform PDCCH reception and application of spatial QCL information received in the DCI for PDSCH processing.
- the QCL time length may be represented by the number of symbols for each subcarrier interval, or may be represented by the time (for example, ⁇ s).
- the QCL time length information may be reported from the UE to the base station as UE capability information, or may be set in the UE from the base station using higher layer signaling.
- the UE may assume that the DMRS port of the PDSCH is a DL-RS and QCL based on the TCI state activated for the CORESET corresponding to the minimum CORESET-ID.
- the latest slot may be, for example, a slot that receives the DCI that schedules the PDSCH.
- CORESET-ID may be an ID (ID for identifying CORESET, controlResourceSetId) set by the RRC information element "ControlResourceSet”.
- the default TCI state may be the activated TCI state that is applicable to the PDSCH in the active DL BWP of the CC and has the lowest ID.
- the delay from PDCCH to PDSCH is for QCL. If less than the time length, or if the TCI state is not in the DCI for the scheduling, the UE is from the active TCI state that is applicable to the PDSCH in the active BWP of the scheduled cell and has the lowest ID. QCL assumptions for the scheduled PDSCH of may be acquired.
- the traffic type may be identified at the physical layer based on at least one of the following: -Logical channels with different priorities-Modulation and Coding Scheme (MCS) table (MCS index table) -Channel Quality Indication (CQI) table-DCI format-Used for scramble (mask) of Cyclic Redundancy Check (CRC) bits included (added) in the DCI (DCI format).
- Radio Network Temporary Identifier eg System Information (SI) -RNTI -RRC (Radio Resource Control) parameters-Specific RNTI (for example, RNTI for URLLC, MCS-C-RNTI, etc.) -Search space-Fields in DCI (for example, newly added fields or reuse of existing fields)
- SI System Information
- RRC Radio Resource Control
- the traffic type may be associated with communication requirements (requirements such as delay and error rate, requirements), data type (voice, data, etc.) and the like.
- the difference between the URLLC requirement and the eMBB requirement may be that the URLLC latency is smaller than the eMBB delay, or that the URLLC requirement includes a reliability requirement.
- Multi TRP In NR, it is considered that one or more transmission / reception points (Transmission / Reception Point (TRP)) (multi-TRP) perform DL transmission to the UE using one or more panels (multi-panel). Has been done. It is also being considered that the UE performs UL transmission to one or more TRPs.
- TRP Transmission / Reception Point
- the plurality of TRPs may correspond to the same cell identifier (cell Identifier (ID)) or may correspond to different cell IDs.
- the cell ID may be a physical cell ID or a virtual cell ID.
- FIG. 2A-2D is a diagram showing an example of a multi-TRP scenario. In these examples, it is assumed that each TRP is capable of transmitting four different beams, but is not limited to this.
- FIG. 2A shows an example of a case (which may be called single mode, single TRP, etc.) in which only one TRP (TRP1 in this example) of the multi-TRPs transmits to the UE.
- the TRP1 transmits both a control signal (PDCCH) and a data signal (PDSCH) to the UE.
- PDCH control signal
- PDSCH data signal
- FIG. 2B shows a case where only one TRP (TRP1 in this example) of the multi-TRP transmits a control signal to the UE, and the multi-TRP transmits a data signal (may be called a single master mode).
- TRP1 TRP1 in this example
- DCI Downlink Control Information
- FIG. 2C shows an example of a case (which may be called a master-slave mode) in which each of the multi-TRPs transmits a part of a control signal to the UE and the multi-TRP transmits a data signal.
- Part 1 of the control signal (DCI) may be transmitted in TRP1
- part 2 of the control signal (DCI) may be transmitted in TRP2.
- Part 2 of the control signal may depend on Part 1.
- the UE receives each PDSCH transmitted from the multi-TRP based on these DCI parts.
- FIG. 2D shows an example of a case (which may be called a multi-master mode) in which each of the multi-TRPs transmits a separate control signal to the UE and the multi-TRP transmits a data signal.
- the first control signal (DCI) may be transmitted in TRP1
- the second control signal (DCI) may be transmitted in TRP2.
- the UE receives each PDSCH transmitted from the multi-TRP based on these DCIs.
- the DCI is a single DCI (S-DCI, single). It may be called PDCCH).
- S-DCI single DCI
- PDCCH PDCCH
- M-DCI multiple PDCCH (multiple PDCCH)
- Non-Coherent Joint Transmission is being studied as a form of multi-TRP transmission.
- TRP1 modulates and maps the first codeword, layer-maps, and transmits the first PDSCH to the first number of layers (for example, two layers) using the first precoding.
- TRP2 modulates and maps the second codeword, layer-maps the second number of layers (for example, two layers), and transmits the second PDSCH using the second precoding.
- the plurality of PDSCHs (multi-PDSCHs) to be NCJT may be defined as partially or completely overlapping with respect to at least one of the time and frequency domains. That is, at least one of the time and frequency resources of the first PDSCH from the first TRP and the second PDSCH from the second TRP may overlap.
- first PDSCH and second PDSCH may be assumed to be not quasi-co-located in a pseudo-collocation (Quasi-Co-Location (QCL)) relationship.
- the reception of the multi-PDSCH may be read as the simultaneous reception of PDSCHs that are not of a certain QCL type (for example, QCL type D).
- Scheme 1a Space division multiplexing (SDM) iterations: Scheme 1a -Frequency division multiplexing (FDM) repetition: Schemes 2a and 2b -Time division multiplexing (TDM) iterations: Schemes 3 and 4
- At least one of these schemes may be supported for URLLC.
- repetitions # 1 and # 2 of codeword (CW) # 1 are transmitted from TRP # 1 and TRP # 2, respectively.
- Each transmission occasion may be one layer or one set (layer set) of layers of the same transport block (TB).
- Each layer or layer set may be associated with one TCI state and one set of DMRS ports.
- a single codeword with one redundant version (RV) may be used across all spatial layers or layer sets. Seen from the UE, the different coding bits are Rel. Map to different layers or different layer sets using the same mapping rules as in 15.
- repetitions # 1 and # 2 of FIG. 3 are mapped to layers # 1 and # 2 in resources having times and frequencies that overlap each other, as shown in FIG. 4, respectively.
- the UE repeatedly receives # 1 using the TCI states # 1 and RV # 0, and repeatedly receives # 2 using the TCI states # 2 and RV # 0.
- repetitions # 1 and # 2 different TCI states and the same RV are used.
- a single codeword with one RV may be used across resource allocations.
- common resource block (RB) mappings codeword-to-layer mappings similar to Rel.15 may be applied across resource allocations.
- a single codeword with one RV may be used for each non-overlapping frequency resource allocation.
- the RVs corresponding to each non-overlapping frequency resource allocation may be the same or different.
- the frequency resource arrangement may be a comb-like frequency resource arrangement among the multi-TRPs.
- PRG wideband precoding resource block group
- the first ceil (N RB / 2) RBs are assigned to TCI state 1 and the remaining floor (N RB / 2) RBs are in TCI state 2. May be assigned.
- PRG size 2 or 4
- even index PRGs in the allocated frequency domain resource allocation (FDRA) are assigned to TCI state 1 and odd index PRGs in the allocated FDRA are It may be assigned to TCI state 2.
- the precoder particle size P may be one of the values of ⁇ 2, 4, wide band ⁇ . If P is 2 or 4, the PRG divides the BWP into P consecutive PRBs.
- repeats # 1 and # 2 in FIG. 3 are assigned to non-overlapping frequency resource allocations # 1 and # 2 in time resources that overlap each other, as shown in FIGS. 5A and 5B. , Each will be mapped.
- the UE repeatedly receives # 1 using the TCI states # 1 and RV # 0, and repeatedly receives # 2 using the TCI states # 2 and RV # 0. For repetitions # 1 and # 2, different TCI states and the same RV are used.
- the repeats # 1 and # 2 of FIG. 3 have non-overlapping frequency resource allocations # 1 and # 2 in the time resources that overlap each other, as shown in FIGS. 6A and 6B. , Each will be mapped.
- the UE repeatedly receives # 1 using the TCI states # 1 and RV # 0, and repeatedly receives # 2 using the TCI states # 2 and RV # 3. Different TCI states and different RVs are used for repetitions # 1 and # 2.
- the non-overlapping frequency resource allocation # 1 is the continuous PRB in the first half of the BWP, and the non-overlapping frequency resource allocation.
- # 2 is a continuous PRB in the latter half of the BWP.
- the precoder particle size is 2 or 4 (PRG size is 2 or 4)
- the non-overlapping frequency resource allocation # 1 is an even index PRG and the non-overlapping frequency.
- Resource allocation # 2 is an odd index PRG.
- Each transmission occasion of the TB may have one TCI state and one RV, using the granularity of the minislot. All transmission occasions in the slot may use a common MCS with the same single or multiple DMRS ports. At least one of the RV and TCI states may be the same or different between multiple transmission occasions.
- the repetitions # 1 and # 2 in FIG. 3 are mapped to transmission occasions # 1 and # 2 in one slot, respectively, as shown in FIG. 7A.
- the UE repeatedly receives # 1 using the TCI states # 1 and RV # 0, and repeatedly receives # 2 using the TCI states # 2 and RV # 3. Different TCI states and different RVs are used for repetitions # 1 and # 2.
- Each transmission occasion of the TB may have one TCI state and one RV. All transmission occasions across K slots may use a common MCS with the same single or multiple DMRS ports. At least one of the RV and TCI states may be the same or different between multiple transmission occasions.
- the repetitions # 1 and # 2 of FIG. 3 are mapped to the transmission occasion # 1 in the first slot and the transmission occasion # 2 in the second slot, respectively, as shown in FIG. 7B.
- the UE repeatedly receives # 1 using the TCI states # 1 and RV # 0, and repeatedly receives # 2 using the TCI states # 2 and RV # 3. Different TCI states and different RVs are used for repetitions # 1 and # 2.
- NCJT using multi-TRP / panel may use high rank.
- Single DCI single PDCCH, eg FIG. 2B
- multi-DCI multi-PDCCH, eg, multi-PDCCH, eg
- the maximum number of TRPs may be 2 for both single DCI and multi DCI.
- TCI Expansion of TCI is being considered for single PDCCH design (mainly for ideal backhaul).
- Each TCI code point in the DCI may correspond to one or two TCI states.
- the TCI field size is Rel. It may be the same as that of 15.
- the UE may support the following combination of layers from the two TRPs indicated by the antenna port field.
- CW code word
- SU single user
- the combination of the number of layers of TRP1 and TRP2 is shown in the format of "number of layers of TRP1 + number of layers of TRP2", whichever is 1 + 1, 1 + 2, 2 + 1, 2 + 2. It may be.
- the size of the antenna port field is Rel. It may be the same as 15.
- the maximum number of CORESETs for each PDCCH setting information may be increased to 5 according to the UE capability.
- the maximum number of CORESETs that can be configured with the same TRP may be up to the number reported by the UE capability.
- the same TRP may be the same upper layer index (eg, CORESET pool index) set for each PDCCH setting information and, if set, for each CORESET.
- the UE capability may include at least 3 candidate values.
- the maximum number of at least one BD and CCE resource per serving cell, per slot may be increased, depending on the UE capability. ..
- Extension of PDSCH is being considered only for multi-PDCCH-based design.
- the total number of CWs in the scheduled multiple PDSCHs may be up to 2.
- Each PDSCH is scheduled by one PDCCH.
- the total number of scheduled PDSCH multi-input multi-output (MIMO) layers may be up to the number reported by the MIMO capability of the UE. Rel. It has not been agreed to increase the maximum number of HARQ processes in 16.
- the UE may support different PDSCH scrambling sequences for multiple PDSCHs.
- the UE may support extending the RRC configuration to configure multiple dataScramblingIdentityPDSCHs.
- Each dataScramblingIdentityPDSCH may be associated with a higher layer index for each CORESET (CORESET pool index) and applied to a PDSCH scheduled with a DCI detected on a CORESET with the same higher layer index.
- UEs are at least fully overlapped, partially overlapped, and non-overlapped in the time and frequency domains. Multiple PDSCHs, which are one, may be supported.
- CRS pattern information for setting a plurality of CRS patterns in a serving cell may be extended to LTE cell-specific RS (cell-specific reference signal (CRS)).
- the CRS pattern information is a parameter for determining the CRS pattern, and the UE may rate match around the CRS pattern.
- Both joint ACK / NACK (HARQ-ACK) feedback and separate ACK / NACK feedback may be supported.
- RRC signaling may be used to switch between joint feedback and separate feedback.
- Both semi-static HARQ-ACK codebooks and dynamic HARQ-ACK codebooks may be supported for joint ACK / NACK feedback.
- a higher layer index for each CORESET used to generate a separate HARQ-ACK codebook may be set, or a semi-static HARQ-ACK codebook and a dynamic HARQ-ACK codebook may be set. Both may be supported, two TDM long PUCCCHs in one slot may be supported, TDM short PUCCHs and long PUCCHs in one slot may be supported, and 1 Two TDM short PUCCCHs in the slot may be supported.
- the UE After reception, if the time offset between the reception of the PDCCH and the corresponding PDSCH is less than the threshold (timeDurationForQCL), the UE will perform a QCL where the DMRS port of the PDSCH is indicated by the next default TCI state. You may assume that the parameters are followed.
- the UE may use the TCI state corresponding to the lowest code point of the TCI code points containing the two different TCI states activated for PDSCH as the default TCI state. If all TCI code points are mapped to a single TCI state, the default TCI state is Rel. You may follow the operation of 15. Using the default TCI state for multiple PDSCHs based on a single DCI may be part of the UE capability.
- the UE will see that the DMRS port of the PDSCH has a TCI within that PDCCH. It may be assumed that one or two TCI states corresponding to the TCI code points indicated by the field are followed.
- the UE For multi-DCI-based multi-TRP / panel transmissions, if the CORESETPoolIndex is set and the time offset between PDCCH reception and the corresponding PDSCH is less than the threshold, the UE The PDSCH DM-RS port has the same value of the CORESET pool index in each latest slot in which one or more CORESETs associated with each of the CORESET pool indexes in the active BWP of the serving cell are monitored by the UE. It may be assumed that the RS and QCL are related to the QCL parameters used for the PDCCH of the lowest CORESET index in the set CORESET. Support for this feature may be indicated (reported) by the UE capability. If the UE does not support this feature, Rel. Fifteen operations may be reused.
- 8A and 8B are diagrams showing an example of the default QCL of the multi-PDSCH based on the single DCI. This example corresponds to the single PDCCH example shown in FIG. 2B.
- the UE receives DCI1 and PDSCH1 transmitted from panel 1 (or TRP1 or CORESET pool 1).
- the UE also receives PDSCH2 transmitted from panel 2 (or TRP2 or CORESET pool 2).
- DCI1 schedules the reception of PDSCH1 and PDSCH2.
- the scheduling offset 1 from the reception of the DCI1 to the PDSCH1 is smaller than the scheduling offset threshold.
- the scheduling offset 2 from the reception of the DCI1 to the PDSCH2 is smaller than the scheduling offset threshold value.
- FIG. 8B shows an example of the correspondence between the TCI code point and the TCI state of the TCI field of DCI1 assumed in the example of FIG. 8A.
- the lowest code point among the TCI code points containing two different TCI states activated for PDSCH is "001".
- the UE may use the TCI state (TCI state ID) of T0 and T1 corresponding to the TCI code point “001” as the default QCL of PDSCH1 and PDSCH2.
- the present inventors have conceived a method for appropriately determining the TCI state of the multi-PDSCH that spans the multi-TRP.
- a panel an Uplink (UL) transmitting entity, a TRP, a spatial relationship, a control resource set (COntrol REsource SET (CORESET)), a PDSCH, a code word, a base station, and an antenna port of a certain signal (for example, a reference signal for demodulation).
- DMRS Demodulation Reference Signal
- antenna port group of a certain signal for example, DMRS port group
- group for multiplexing for example, Code Division Multiplexing (CDM)
- CDM Code Division Multiplexing
- RV redundant version
- layers MIMO layer, transmission layer, spatial layer
- the panel Identifier (ID) and the panel may be read as each other.
- TRP ID and TRP may be read as each other.
- NCJT, NCJT using multi-TRP, multi-PDSCH using NCJT, multi-PDSCH, a plurality of PDSCHs from multi-TRP, and the like may be read as each other.
- the multi-PDSCH may mean a plurality of PDSCHs multiplexed by at least one of SDM, FDM, and TDM, may mean a plurality of PDSCHs carrying the same TB or the same CW, and may mean different UE reception beams. It may mean a plurality of PDSCHs to which (spatial domain reception filter, QCL parameter, TCI state) are applied.
- the default TCI state may be read as the default QCL, the default QCL assumption, and the like.
- this TCI state or QCL (QCL assumption) is referred to as a default TCI state, but the name is not limited to this.
- the definition of the default TCI state is not limited to this.
- the default TCI state may be, for example, a TCI state assumed when the TCI state / QCL specified by the DCI is not available for a certain channel / signal (for example, PDSCH), or the TCI state / QCL is specified (for example). Alternatively, it may be in the TCI state assumed when it is not set).
- cells, CCs, carriers, BWPs, and bands may be read as each other.
- index, ID, indicator, and resource ID may be read as each other.
- the QCL parameters followed by the port, the TCI state or QCL-assumed QCL type D RS, and the TCI state or QCL-assumed QCL type A RS may be read interchangeably.
- the QCL type D RS, the DL-RS associated with the QCL type D, the DL-RS having the QCL type D, the DL-RS source, the SSB, and the CSI-RS may be read interchangeably.
- the TCI state is information about a receive beam (spatial domain receive filter) instructed (set) to the UE (for example, DL-RS, QCL type, cell to which DL-RS is transmitted, etc.). You may.
- the QCL assumption is based on the transmission or reception of the associated signal (eg, PRACH) and the information about the receive beam (spatial domain receive filter) assumed by the UE (eg, DL-RS, QCL type, DL-RS is transmitted). It may be a cell, etc.).
- the latest slot, the most recent slot, the latest search space, and the latest search space may be read as each other.
- DCI format 0_0 DCI without SRI, DCI without spatial indication, and DCI without CIF may be read as each other.
- DCI format 0_1 DCI including SRI, DCI including spatially related instructions, and DCI including CIF may be read interchangeably.
- the UE may receive a single DCI that schedules a multi-PDSCH.
- the UE may map the two TCI states corresponding to the specific TCI code points to the two PDSCHs.
- Two TCI states may be associated with a particular TCI code point by at least one of RRC settings and MAC CE activation.
- a particular TCI code point includes two different active TCI states for PDSCH when the time offset between DCI and the corresponding multi-PDSCH is shorter than the threshold, or when no TCI field presence information is set. It may be the lowest code point of the TCI code points, depending on the TCI field in the single DCI that schedules the multi-PDSCH when the time offset between the DCI and the corresponding multi-PDSCH is greater than or equal to the threshold. It may be the indicated TCI code point.
- the UE may determine the order of the two PDSCHs (ID for PDSCH).
- the UE may determine the order of the two PDSCHs based on either the respective resources of the two PDSCHs and the parameters used for each of the two PDSCHs.
- the order of the two PDSCHs is PDSCH, CW, HARQ process ID, layer, TB, RV, CORESET (CORESET pool index) that schedules PDSCH, and PDSCH reception occasions in schemes 3 or 4 (reception timing, reception start symbol, reception). It may be associated with a resource or parameter for at least one of the sequence of slots), the sequence of PDSCH frequencies (frequency resources, RE, PRB, PRG) in schemes 2a or 2b, initial transmission and retransmission.
- the UE may map the two TCI states corresponding to the specific TCI code points to the two PDSCHs based on the order of the two PDSCHs and one of the following mappings 1 and 2.
- the UE may determine the first TCI state ID and the second TCI state ID according to the order of the TCI state IDs (ascending or descending order).
- the UE may determine the first TCI state ID and the second TCI state ID according to the order of the TCI state IDs (position, ascending or descending order) notified by at least one of the settings or activations.
- mapping 2 for example, if two TCI state IDs associated with a particular TCI code point are set by a list of RRC information elements (IE), the first one according to its position in the list.
- the TCI state ID and the second TCI state ID are determined. For example, if two TCI state IDs associated with a particular TCI code point are activated by a MAC CE field, the first TCI state ID and the second TCI state ID will be according to their location within the MAC CE. It is determined. For example, if two TCI state IDs associated with a particular TCI code point are set or activated by the RRC or MAC CE bitmap and the bit positions in the bitmap correspond to the TCI state IDs, then there are two TCI states. The first TCI state ID and the second TCI state ID are determined according to the position of the corresponding bit.
- FIG. 9A is a diagram showing an example of the association between the TCI code point and the TCI state, which is notified by at least one of the setting by RRC and the activation by MAC CE.
- the specific TCI code point is the lowest code point of the TCI code points containing the two active TCI states, which is "001". 0 and 1 are notified as the TCI status ID associated with the specific TCI code point.
- mapping 2 ascending order of the position of the TCI state ID in the notification
- the first TCI state ID is 0 and the first TCI state ID is 1.
- the first TCI state ID may be used for layer # 1 and the second TCI state ID may be used for layer # 2.
- mapping 2 is used for the association of FIG. 9A, for example, as shown in FIG. 10, the TCI state ID of layer # 1 is 0 and the TCI state ID of layer # 2 is 1.
- the first TCI state ID may be used for frequency resource allocation # 1 and the second TCI state ID may be used for frequency resource allocation # 2.
- mapping 2 is used for the association of FIG. 9A, for example, as shown in FIGS. 11A and 11B, the TCI state ID of frequency resource allocation # 1 is 0 and the TCI state ID of frequency resource allocation # 2 is. It is 1.
- the first TCI state ID may be used for transmission occasion # 1 and the second TCI state ID may be used for transmission occasion # 2.
- mapping 2 is used for the association of FIG. 9A, for example, as shown in FIGS. 12A and 12B, the TCI state ID of transmission occasion # 1 is 0 and the TCI state ID of transmission occasion # 2 is 1. is there.
- FIG. 9B is a diagram showing another example of the association between the TCI code point and the TCI state, which is notified by at least one of the setting by RRC and the activation by MAC CE.
- the specific TCI code point is the lowest code point of the TCI code points containing the two active TCI states, which is "001". 1 and 0 are notified as the TCI status ID associated with the specific TCI code point.
- mapping 1 ascending order of TCI state IDs
- the first TCI state ID is 0 and the first TCI state ID is 1.
- mapping 1 (ascending order of TCI state IDs) is used for the association of FIG. 13, the two TCI states for the two PDSCHs are similar to those of FIGS. 10, 11A, 11B, 12A, 12B. is there.
- the UE can change N TCI states to N PDSCHs even when N active TCI states are associated with one TCI code point. Can be properly mapped to.
- the UE may assume (or use or determine) one default QCL for all PDSCHs (repetitions).
- the single QCL application condition may be that the TCI field existence information (tci-PresentInDCI) is not set.
- the single QCL application condition may be that the TCI field existence information is set and that no TCI code point is associated with two active TCI states.
- One default QCL when the single QCL application condition is met may be one of the following TCI states or QCL assumptions.
- TCI state with the lowest or highest ID of CORESET may be used, or the TCI state with the lowest or highest ID of CORESET on the latest slot-In the TCI code point associated with one active TCI state
- One default QCL explicitly notified -The first default QCL of the two default QCLs explicitly notified by MAC CE or RRC (new parameter, new field) -TCI state with the lowest or highest ID of the two default QCLs explicitly notified by MAC CE or RRC (new parameter, new field)
- the UE is multi-player when the TCI field existence information is not set or when there is no TCI code point associated with the two active TCI states.
- One default QCL for PDSCH can be appropriately determined.
- wireless communication system Wireless communication system
- communication is performed using any one of the wireless communication methods according to each of the above-described embodiments of the present disclosure or a combination thereof.
- FIG. 13 is a diagram showing an example of a schematic configuration of a wireless communication system according to an 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 Third Generation Partnership Project (3GPP). ..
- the wireless communication system 1 may support dual connectivity between a plurality of Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)).
- MR-DC is dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), and dual connectivity between NR and LTE (NR-E).
- -UTRA Dual Connectivity (NE-DC) may be included.
- the LTE (E-UTRA) base station (eNB) is the master node (Master Node (MN)), and the NR base station (gNB) is the secondary node (Secondary Node (SN)).
- the base station (gNB) of NR is MN
- the base station (eNB) of LTE (E-UTRA) is SN.
- the wireless communication system 1 has dual connectivity between a plurality of base stations in 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.
- a plurality of base stations in the same RAT for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) in which both MN and SN are NR base stations (gNB). )
- NR-NR Dual Connectivity NR-DC
- gNB NR base stations
- the wireless communication system 1 includes a base station 11 that forms a macro cell C1 having a relatively wide coverage, and a base station 12 (12a-12c) that is arranged in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. You may prepare.
- the user terminal 20 may be located in at least one cell. The arrangement, number, and the like of each cell and the user terminal 20 are not limited to the mode shown in the figure.
- the base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.
- the user terminal 20 may be connected to at least one of the plurality of base stations 10.
- the user terminal 20 may use at least one of carrier aggregation (Carrier Aggregation (CA)) and dual connectivity (DC) using a plurality of component carriers (Component Carrier (CC)).
- CA Carrier Aggregation
- DC dual connectivity
- CC Component Carrier
- Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)).
- the macro cell C1 may be included in FR1 and the small cell C2 may be included in FR2.
- FR1 may be in a frequency band of 6 GHz or less (sub 6 GHz (sub-6 GHz)), and FR2 may be in a frequency band higher than 24 GHz (above-24 GHz).
- the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.
- the user terminal 20 may perform communication 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
- the plurality of base stations 10 may be connected by wire (for example, optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (for example, NR communication).
- wire for example, optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.
- NR communication for example, when NR communication is used as a backhaul between base stations 11 and 12, the base station 11 corresponding to the higher-level station is an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to a relay station (relay) is IAB. It may be called a node.
- IAB Integrated Access Backhaul
- relay station relay station
- the base station 10 may be connected to the core network 30 via another base station 10 or directly.
- the core network 30 may include at least one such as Evolved Packet Core (EPC), 5G Core Network (5GCN), and Next Generation Core (NGC).
- EPC Evolved Packet Core
- 5GCN 5G Core Network
- NGC Next Generation Core
- the user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.
- a wireless access method based on Orthogonal Frequency Division Multiplexing may be used.
- OFDM Orthogonal Frequency Division Multiplexing
- DL Downlink
- UL Uplink
- 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
- the wireless access method may be called a waveform.
- another wireless access system for example, another single carrier transmission system, another multi-carrier transmission system
- the UL and DL wireless access systems may be used as the UL and DL wireless access systems.
- downlink shared channels Physical Downlink Shared Channel (PDSCH)
- broadcast channels Physical Broadcast Channel (PBCH)
- downlink control channels Physical Downlink Control
- Channel PDCCH
- the uplink shared channel Physical Uplink Shared Channel (PUSCH)
- the uplink control channel Physical Uplink Control Channel (PUCCH)
- the random access channel shared by each user terminal 20 are used.
- Physical Random Access Channel (PRACH) Physical Random Access Channel or the like may be used.
- User data, upper layer control information, System Information Block (SIB), etc. are transmitted by PDSCH.
- User data, upper layer control information, and the like may be transmitted by the PUSCH.
- the Master Information Block (MIB) may be transmitted by the PBCH.
- Lower layer control information may be transmitted by PDCCH.
- the lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of 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.
- the PDSCH may be read as DL data
- the PUSCH may be read as UL data.
- a control resource set (COntrol REsource SET (CORESET)) and a search space (search space) may be used to detect PDCCH.
- CORESET corresponds to a resource that searches for DCI.
- the search space corresponds to the search area and search method of PDCCH candidates (PDCCH candidates).
- One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a search space 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.
- the "search space”, “search space set”, “search space setting”, “search space set setting”, “CORESET”, “CORESET setting”, etc. of the present disclosure may be read as each other.
- channel state information (Channel State Information (CSI)
- delivery confirmation information for example, it may be called Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.
- scheduling request (Scheduling Request () Uplink Control Information (UCI) including at least one of SR)
- the PRACH may transmit a random access preamble to establish a connection with the cell.
- downlinks, uplinks, etc. may be expressed without “links”. Further, it may be expressed without adding "Physical" at the beginning of various channels.
- a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), and the like may be transmitted.
- the DL-RS includes a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), and a demodulation reference signal (DeModulation).
- CRS Cell-specific Reference Signal
- CSI-RS Channel State Information Reference Signal
- DeModulation Demodulation reference signal
- Reference Signal (DMRS)), positioning reference signal (Positioning Reference Signal (PRS)), phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), and the like may be transmitted.
- PRS Positioning Reference Signal
- PTRS Phase Tracking Reference Signal
- the synchronization signal may be, for example, at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- the signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be referred to as SS / PBCH block, SS Block (SSB) and the like.
- SS, SSB and the like may also be called a reference signal.
- a measurement reference signal Sounding Reference Signal (SRS)
- a demodulation reference signal DMRS
- UL-RS Uplink Reference Signal
- UE-specific Reference Signal UE-specific Reference Signal
- FIG. 14 is a diagram showing an example of the configuration of the base station according to the embodiment.
- the base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission line interface 140.
- the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140 may each be provided with one or more.
- this example mainly shows the functional blocks of the feature portion in 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 part described below may be omitted.
- the control unit 110 controls the entire base station 10.
- the control unit 110 can be composed of a controller, a control circuit, and the like described based on the common recognition in the technical field according to the present disclosure.
- the control unit 110 may control signal generation, scheduling (for example, resource allocation, mapping) and the like.
- the control unit 110 may control transmission / reception, measurement, and the like 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, and the like, and transfer the data to the transmission / reception unit 120.
- the control unit 110 may perform call processing (setting, release, etc.) of the communication channel, state management of the base station 10, management of radio resources, and the like.
- the transmission / reception unit 120 may include a baseband unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123.
- the baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212.
- the transmitter / receiver 120 includes a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitter / receiver circuit, and the like, which are described based on common recognition in the technical fields 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 composed of a transmission unit and a reception unit.
- the transmission unit may be composed of a transmission processing unit 1211 and an RF unit 122.
- the receiving unit may be composed of a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.
- the transmitting / receiving antenna 130 can be composed of an antenna described based on common recognition in the technical field according to the present disclosure, for example, an array antenna.
- the transmission / reception unit 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, and the like.
- the transmission / reception unit 120 may receive the above-mentioned uplink channel, uplink reference signal, and the like.
- the transmission / reception unit 120 may form at least one of a transmission beam and a reception beam by using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.
- digital beamforming for example, precoding
- analog beamforming for example, phase rotation
- the transmission / reception unit 120 processes, for example, Packet Data Convergence Protocol (PDCP) layer processing and Radio Link Control (RLC) layer processing (for example, RLC) for data, control information, etc. acquired from control unit 110.
- 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 performs channel coding (may include error correction coding), modulation, mapping, filtering, and discrete Fourier transform (Discrete Fourier Transform (DFT)) for the bit string to be transmitted.
- the base band signal may be output by performing processing (if necessary), inverse fast Fourier transform (IFFT) processing, precoding, digital-analog conversion, and other transmission processing.
- IFFT inverse fast Fourier transform
- the transmission / reception unit 120 may perform modulation, filtering, amplification, etc. on the baseband signal to the radio frequency band, and transmit the signal in the radio frequency band via the transmission / reception antenna 130. ..
- the transmission / reception unit 120 may perform amplification, filtering, demodulation to a baseband signal, or the like on the signal in the radio frequency band received by the transmission / reception antenna 130.
- the transmission / reception unit 120 (reception processing unit 1212) performs analog-digital conversion, fast Fourier transform (FFT) processing, and inverse discrete Fourier transform (IDFT) on the acquired baseband signal. )) Processing (if necessary), filtering, decoding, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing are applied. User data and the like may be acquired.
- FFT fast Fourier transform
- IDFT inverse discrete Fourier transform
- the transmission / reception unit 120 may perform measurement on the received signal.
- the measurement unit 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, or the like based on the received signal.
- the measuring unit 123 has received power (for example, Reference Signal Received Power (RSRP)) and reception quality (for example, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)).
- RSRP Reference Signal Received Power
- RSSQ Reference Signal Received Quality
- SINR Signal to Noise Ratio
- Signal strength for example, Received Signal Strength Indicator (RSSI)
- propagation path information for example, CSI
- the measurement result may be output to the control unit 110.
- the transmission line interface 140 transmits / receives signals (backhaul signaling) to / from a device included in the core network 30, another base station 10 and the like, and provides user data (user plane data) and control plane for the user terminal 20. Data or the like may be acquired or transmitted.
- the transmission unit and the reception unit of the base station 10 in the present disclosure may be composed of at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140.
- the transmission / reception unit 120 transmits one or both of a plurality of downlink shared channels (Physical Downlink Shared Channel (PDSCH)) (multi-PDSCH) scheduled based on one downlink control information (single PDCCH). May be good.
- PDSCH Physical Downlink Shared Channel
- multi-PDSCH multiple downlink control information
- FIG. 15 is a diagram showing an example of the configuration of the user terminal according to the embodiment.
- the user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230.
- the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may each be provided with one or more.
- this example mainly shows the functional blocks of the feature portion in 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 part described below may be omitted.
- the control unit 210 controls the entire user terminal 20.
- the control unit 210 can be composed of a controller, a control circuit, and the like described based on the 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, and the like using the transmission / reception unit 220 and the transmission / reception antenna 230.
- the control unit 210 may generate data to be transmitted as a signal, control information, a sequence, and the like, and transfer the data to the transmission / reception unit 220.
- the transmission / reception unit 220 may include a baseband unit 221 and an RF unit 222, and a measurement unit 223.
- the baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212.
- the transmitter / receiver 220 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitter / receiver circuit, and the like, which are described based on the 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 composed of a transmission unit and a reception unit.
- the transmission unit may be composed of a transmission processing unit 2211 and an RF unit 222.
- the receiving unit may be composed of a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.
- the transmitting / receiving antenna 230 can be composed of an antenna described based on common recognition in the technical field according to the present disclosure, for example, an array antenna.
- the transmission / reception unit 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, and the like.
- the transmission / reception unit 220 may transmit the above-mentioned uplink channel, uplink reference signal, and the like.
- the transmission / reception unit 220 may form at least one of a transmission beam and a reception beam by using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.
- digital beamforming for example, precoding
- analog beamforming for example, phase rotation
- the transmission / reception unit 220 (transmission processing unit 2211) performs PDCP layer processing, RLC layer processing (for example, RLC retransmission control), and MAC layer processing (for example, for data, control information, etc. acquired from the control unit 210). , 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, control information, etc. acquired from the control unit 210.
- HARQ retransmission control HARQ retransmission control
- the transmission / reception unit 220 (transmission processing unit 2211) performs channel coding (may include error correction coding), modulation, mapping, filtering processing, DFT processing (if necessary), and IFFT processing for the bit string to be transmitted. , Precoding, digital-to-analog conversion, and other transmission processing may be performed to output the baseband signal.
- Whether or not to apply the DFT process may be based on the transform precoding setting.
- the transmission / reception unit 220 transmits the channel using the DFT-s-OFDM waveform.
- the DFT process may be performed as the transmission process, and if not, the DFT process may not be performed as the transmission process.
- the transmission / reception unit 220 may perform modulation, filtering, amplification, etc. on the baseband signal to the radio frequency band, and transmit the signal in the radio frequency band via the transmission / reception antenna 230. ..
- the transmission / reception unit 220 may perform amplification, filtering, demodulation to a baseband signal, or the like on the signal in the radio frequency band received by the transmission / reception antenna 230.
- the transmission / reception unit 220 (reception processing unit 2212) performs analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering processing, demapping, demodulation, and decoding (error correction) for the acquired baseband signal. Decoding may be included), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing may be applied to acquire user data and the like.
- the transmission / reception unit 220 may perform measurement on the received signal.
- the measuring unit 223 may perform RRM measurement, CSI measurement, or the like based on the received signal.
- the measuring unit 223 may measure received power (for example, RSRP), reception quality (for example, RSRQ, SINR, SNR), signal strength (for example, RSSI), propagation path information (for example, CSI), and the like.
- the measurement result may be output to the control unit 210.
- the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may be composed of at least one of the transmitting / receiving unit 220 and the transmitting / receiving antenna 230.
- the transmission / reception unit 220 may receive one downlink control information (DCI) for scheduling two physical downlink shared channels (PDSCH). If the specific code point in the transmission setting instruction (TCI) field is used to receive the two PDSCHs, the control unit 210 maps the two TCI state IDs associated with the specific code point to the two PDSCHs, respectively. You may.
- DCI downlink control information
- TCI transmission setting instruction
- the specific code point is a TCI field associated with two different active TCI states for PDSCH when the time offset between the DCI and the two PDSCHs is less than the threshold value, or when the TCI field is not set.
- the lowest code point in the DCI and the code point indicated by the TCI field in the DCI when the time offset between the DCI and the two PDSCHs is greater than or equal to the threshold. You may.
- the control unit 210 is based on the positions of the two TCI state IDs in the notification of the two TCI state IDs, the order of the two TCI state IDs, and the order of the two PDSCHs.
- the TCI state ID may be mapped to each of the two PDSCHs.
- the control unit 210 may determine the order of the two PDSCHs based on at least one of the resources of the two PDSCHs and the parameters used for each of the two PDSCHs.
- the control unit 210 will perform one TCI.
- the state may be used to receive the two PDSCHs.
- each functional block may be realized by using one device that is physically or logically connected, or directly or indirectly (for example, by two or more devices that are physically or logically separated). , Wired, wireless, etc.) and may be realized using these plurality of devices.
- the functional block may be realized by combining the software with the one device or the plurality of devices.
- the functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and deemed. , Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc.
- a functional block (constituent unit) for functioning transmission may be referred to as a transmitting unit (transmitting unit), a transmitter (transmitter), or the like.
- the method of realizing each of them is not particularly limited.
- the base station, user terminal, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure.
- FIG. 16 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment.
- the base station 10 and the 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 the devices shown in the figure, or may be configured not to include some of the devices.
- processor 1001 may be a plurality of processors. Further, the processing may be executed by one processor, or the processing may be executed simultaneously, sequentially, or by using other methods by two or more processors.
- the processor 1001 may be mounted by one or more chips.
- the processor 1001 For each function of the base station 10 and the user terminal 20, for example, by loading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, the processor 1001 performs an operation and communicates via the communication device 1004. It is realized by controlling at least one of reading and writing of data in the memory 1002 and the storage 1003.
- predetermined software program
- Processor 1001 operates, for example, an operating system to control 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 unit, a register, and the like.
- CPU central processing unit
- control unit 110 210
- transmission / reception unit 120 220
- the like may be realized by the processor 1001.
- the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these.
- a program program code
- the control unit 110 may be realized by a control program stored in the memory 1002 and operating in the processor 1001, and may be realized in the same manner for other functional blocks.
- the memory 1002 is a computer-readable recording medium, for example, at least of Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), and other suitable storage media. It may be composed of one.
- the memory 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like.
- the memory 1002 can store a program (program code), a software module, or the like that can be executed to implement the wireless communication method according to the embodiment of the present disclosure.
- the storage 1003 is a computer-readable recording medium, and is, for example, a flexible disc, a floppy (registered trademark) disc, an optical magnetic disc (for example, a compact disc (Compact Disc ROM (CD-ROM)), a digital versatile disc, etc.). At least one of Blu-ray® disks, removable disks, optical disc drives, smart cards, flash memory devices (eg cards, sticks, key drives), magnetic stripes, databases, servers, and other suitable storage media. It may be composed of.
- the storage 1003 may be referred to as an auxiliary storage device.
- the communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like.
- the communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)). May be configured to include.
- FDD Frequency Division Duplex
- TDD Time Division Duplex
- the transmission / reception unit 120 (220), the transmission / reception antenna 130 (230), and the like described above may be realized by the communication device 1004.
- the transmission / reception unit 120 (220) may be physically or logically separated from the transmission unit 120a (220a) and the reception unit 120b (220b).
- the input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an 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.
- the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).
- each device such as the processor 1001 and the memory 1002 is connected by the bus 1007 for communicating information.
- the bus 1007 may be configured by using a single bus, or may be configured by using a different bus for each device.
- the base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (Digital Signal Processor (DSP)), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), and the like. It may be configured to include hardware, and a part or all of each functional block may be realized by using the hardware. For example, processor 1001 may be implemented using at least one of these hardware.
- DSP Digital Signal Processor
- ASIC Application Specific Integrated Circuit
- PLD Programmable Logic Device
- FPGA Field Programmable Gate Array
- the terms described in the present disclosure and the terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings.
- channels, symbols and signals may be read interchangeably.
- the signal may be a message.
- the reference signal may be abbreviated as RS, and may be referred to as a pilot, a pilot signal, or the like depending on the applied standard.
- the component carrier Component Carrier (CC)
- CC Component Carrier
- the wireless frame may be composed of one or more periods (frames) in the time domain.
- Each of the one or more periods (frames) constituting the wireless frame may be referred to as a subframe.
- the subframe may be composed of one or more slots in the time domain.
- the subframe may have a fixed time length (eg, 1 ms) that is independent of numerology.
- the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel.
- Numerology includes, for example, subcarrier spacing (SubCarrier Spacing (SCS)), bandwidth, symbol length, cyclic prefix length, transmission time interval (Transmission Time Interval (TTI)), number of symbols per TTI, and wireless frame configuration.
- SCS subcarrier Spacing
- TTI Transmission Time Interval
- a specific filtering process performed by the transmitter / receiver in the frequency domain, a specific windowing process performed by the transmitter / receiver in the time domain, and the like may be indicated.
- the slot may be composed of one or more symbols in the time domain (Orthogonal Frequency Division Multiple Access (OFDMA) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.).
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- the slot may be a time unit based on numerology.
- the slot may include a plurality of mini slots. Each minislot may consist of one or more symbols in the time domain. The mini-slot may also be referred to as a sub-slot. A minislot may consist of a smaller number of symbols than the slot.
- a PDSCH (or PUSCH) transmitted in time units larger than the minislot may be referred to as a PDSCH (PUSCH) mapping type A.
- the PDSCH (or PUSCH) transmitted using the minislot may be referred to as PDSCH (PUSCH) mapping type B.
- the wireless frame, subframe, slot, minislot and symbol all represent the time unit when transmitting a signal.
- the radio frame, subframe, slot, minislot and symbol may have different names corresponding to each.
- the time units such as frames, subframes, slots, mini slots, and symbols in the present disclosure may be read as each other.
- one subframe may be called TTI
- a plurality of consecutive subframes may be called TTI
- one slot or one minislot may be called 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. It may be.
- the unit representing TTI may be called a slot, a mini slot, or the like instead of a subframe.
- TTI refers to, for example, the minimum time unit of scheduling in wireless communication.
- the base station schedules each user terminal to allocate radio resources (frequency bandwidth that can be used in each user terminal, transmission power, etc.) in TTI units.
- the definition of TTI is not limited to this.
- the TTI may be a transmission time unit such as a channel-encoded data packet (transport block), a code block, or a code word, or may be a processing unit such as scheduling or link adaptation.
- the time interval for example, the number of symbols
- the transport block, code block, code word, etc. may be shorter than the TTI.
- one or more TTIs may be the minimum time unit for scheduling. Further, the number of slots (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 referred to as a normal TTI (TTI in 3GPP Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, or the like.
- TTIs shorter than normal TTIs may be referred to as shortened TTIs, short TTIs, partial TTIs (partial or fractional TTIs), shortened subframes, short subframes, minislots, subslots, slots, and the like.
- the long TTI (for example, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms, and the short TTI (for example, shortened TTI, etc.) is less than the TTI length of the long TTI and 1 ms. It may be read as a TTI having the above TTI length.
- a resource block is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain.
- the number of subcarriers contained in the RB may be the same regardless of the numerology, and may be, for example, 12.
- the number of subcarriers contained in the RB may be determined based on numerology.
- the RB may include one or more symbols in the time domain, and may have a length of 1 slot, 1 mini slot, 1 subframe or 1 TTI.
- Each 1TTI, 1 subframe, etc. may be composed of one or a plurality of resource blocks.
- One or more RBs are a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, and an RB. It may be called a pair or the like.
- Physical RB Physical RB (PRB)
- SCG sub-carrier Group
- REG resource element group
- the resource block may be composed of one or a plurality of resource elements (Resource Element (RE)).
- RE Resource Element
- 1RE may be a radio resource area of 1 subcarrier and 1 symbol.
- Bandwidth Part (which may also be called partial bandwidth, etc.) represents a subset of consecutive common resource blocks (RBs) for a neurology in a carrier. May be good.
- the common RB may be specified by the index of the RB with respect to the common reference point of the carrier.
- PRBs may be defined in a BWP and numbered within that BWP.
- the BWP may include UL BWP (BWP for UL) and DL BWP (BWP for DL).
- BWP UL BWP
- BWP for DL DL BWP
- One or more BWPs may be set in one carrier for the UE.
- At least one of the configured BWPs may be active, and the UE may not expect to send or receive a given signal / channel outside the active BWP.
- “cell”, “carrier” and the like in this disclosure may be read as “BWP”.
- the above-mentioned structures such as wireless frames, subframes, slots, mini slots, and symbols are merely examples.
- the number of subframes contained in a wireless frame the number of slots per subframe or wireless frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, included in the RB.
- the number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.
- the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values from predetermined values, or using other corresponding information. It may be represented. For example, radio resources may be indicated by a given index.
- the information, signals, etc. described in this disclosure may be represented using any of a variety of different techniques.
- data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.
- information, signals, etc. can be output from the upper layer to the lower layer and from the lower layer to at least one of the upper layers.
- Information, signals, etc. may be input / output via a plurality of 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 / output information, signals, etc. can be overwritten, updated, or added. The output information, signals, etc. may be deleted. The input information, signals, etc. may be transmitted to other devices.
- the notification of information is not limited to the mode / embodiment described in the present disclosure, and may be performed by using another method.
- the notification of information in the present disclosure includes physical layer signaling (for example, downlink control information (DCI)), uplink control information (Uplink Control Information (UCI))), and higher layer signaling (for example, Radio Resource Control). (RRC) signaling, broadcast information (master information block (MIB), system information block (SIB), etc.), medium access control (MAC) signaling), other signals or combinations thereof May be carried out by.
- DCI downlink control information
- UCI Uplink Control Information
- RRC Radio Resource Control
- MIB master information block
- SIB system information block
- MAC medium access control
- the physical layer signaling may be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), and the like.
- the RRC signaling may be called an RRC message, and may be, for example, an RRC connection setup (RRC Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration) message, or the like.
- MAC signaling may be notified using, for example, a MAC control element (MAC Control Element (CE)).
- CE MAC Control Element
- the notification of predetermined information is not limited to the explicit notification, but implicitly (for example, by not notifying the predetermined information or another information). May be done (by notification of).
- the determination may be made by a value represented by 1 bit (0 or 1), or by a boolean value represented by true or false. , May be done by numerical comparison (eg, comparison with a given value).
- Software whether referred to as software, firmware, middleware, microcode, hardware description language, or by any other name, is an instruction, instruction set, code, code segment, program code, program, subprogram, software module.
- Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, features, etc. should be broadly interpreted.
- software, instructions, information, etc. may be transmitted and received via a transmission medium.
- a transmission medium For example, a website where software uses at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.).
- wired technology coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.
- wireless technology infrared, microwave, etc.
- the terms “system” and “network” used in this disclosure may be used interchangeably.
- the “network” may mean a device (eg, a base station) included in the network.
- precoding "precoding weight”
- QCL Quality of Co-Co-Location
- TCI state Transmission Configuration Indication state
- space "Spatial relation”, “spatial 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 compatible.
- Base station BS
- radio base station fixed station
- NodeB NodeB
- eNB eNodeB
- gNB gNodeB
- Access point "Transmission point (Transmission Point (TP))
- RP Reception point
- TRP Transmission / Reception Point
- Panel , "Cell”, “sector”, “cell group”, “carrier”, “component carrier” and the like
- Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.
- the base station can accommodate one or more (for example, three) cells.
- a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (Remote Radio)).
- Communication services can also be provided by Head (RRH))).
- RRH Head
- the term "cell” or “sector” refers to part or all of the coverage area of at least one of the base stations and base station subsystems that provide communication services in this coverage.
- MS mobile station
- UE user equipment
- terminal terminal
- 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. , Handset, user agent, mobile client, 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 the mobile body, the mobile body itself, or the like.
- the moving body may be a vehicle (for example, a car, an airplane, etc.), an unmanned moving body (for example, a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned type). ) May be.
- at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation.
- at least one of the base station and the 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 by the user terminal.
- the communication between the base station and the user terminal is replaced with the communication between a plurality of user terminals (for example, it may be called Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.).
- D2D Device-to-Device
- V2X Vehicle-to-Everything
- Each aspect / embodiment of the present disclosure may be applied to the configuration.
- the user terminal 20 may have the function of the base station 10 described above.
- words such as "up” and “down” may be read as words corresponding to inter-terminal communication (for example, "side”).
- an uplink channel, a downlink channel, and the like may be read as a side channel.
- the user terminal in the present disclosure may be read as a base station.
- the base station 10 may have the functions of the user terminal 20 described above.
- the operation performed by the base station may be performed by its upper node (upper node) in some cases.
- various operations performed for communication with a terminal are performed by the base station and one or more network nodes other than the base station (for example,).
- Mobility Management Entity (MME), Serving-Gateway (S-GW), etc. can be considered, but it is not limited to these), or it is clear that it can be performed by a combination thereof.
- each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched with execution. Further, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be changed as long as there is no contradiction. For example, the methods described in the present disclosure present elements of various steps using exemplary order, and are not limited to the particular order presented.
- LTE Long Term Evolution
- LTE-A LTE-Advanced
- SUPER 3G IMT-Advanced
- 4G 4th generation mobile communication system
- 5G 5th generation mobile communication system
- Future Radio Access FAA
- New-Radio Access Technology RAT
- NR New Radio
- NX New radio access
- Future generation radio access FX
- GSM Global System for Mobile communications
- CDMA2000 Code Division Multiple Access
- UMB Ultra Mobile Broadband
- IEEE 802.11 Wi-Fi (registered trademark)
- LTE 802.16 WiMAX (registered trademark)
- a plurality of systems may be applied in combination (for example, a combination of LTE or LTE-A and 5G).
- references to elements using designations such as “first”, “second”, etc. as used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, references to the first and second elements do not mean that only two elements can be adopted or that the first element must somehow precede the second element.
- determining used in this disclosure may include a wide variety of actions.
- judgment (decision) means judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (deriving), investigation (investigating), search (looking up, search, inquiry) ( For example, searching in a table, database or another data structure), ascertaining, etc. may be considered to be "judgment”.
- judgment (decision) includes receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access (for example). It may be regarded as “judgment (decision)” such as “accessing” (for example, accessing data in memory).
- judgment (decision) is regarded as “judgment (decision)” of solving, selecting, selecting, establishing, comparing, and the like. May be good. That is, “judgment (decision)” may be regarded as “judgment (decision)” of some action.
- connection are any direct or indirect connection or connection between two or more elements. Means, and can include the presence of one or more intermediate elements between two elements that are “connected” or “joined” to each other.
- the connection or connection between the elements may be physical, logical, or a combination thereof. For example, "connection” may be read as "access”.
- the radio frequency domain microwaves. It can be considered to be “connected” or “coupled” to each other using frequency, electromagnetic energy having wavelengths in the light (both visible and invisible) regions, and the like.
- the term "A and B are different” may mean “A and B are different from each other”.
- the term may mean that "A and B are different from C”.
- Terms such as “separate” and “combined” may be interpreted in the same way as “different”.
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Abstract
Description
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。
PDCCH(又はPDCCHに関連するDMRSアンテナポート)と、あるRSとの、QCLに関する情報は、PDCCHのためのTCI状態などと呼ばれてもよい。
PDSCH(又はPDSCHに関連するDMRSアンテナポート)と、あるDL-RSとの、QCLに関する情報は、PDSCHのためのTCI状態などと呼ばれてもよい。
将来の無線通信システム(例えば、NR)では、モバイルブロードバンドのさらなる高度化(例えば、enhanced Mobile Broadband(eMBB))、多数同時接続を実現するマシンタイプ通信(例えば、massive Machine Type Communications(mMTC)、Internet of Things(IoT))、高信頼かつ低遅延通信(例えば、Ultra-Reliable and Low-Latency Communications(URLLC))などのトラフィックタイプ(タイプ、サービス、サービスタイプ、通信タイプ、ユースケース、等ともいう)が想定される。例えば、URLLCでは、eMBBより小さい遅延及びより高い信頼性が要求される。
・異なる優先度(priority)を有する論理チャネル
・変調及び符号化方式(Modulation and Coding Scheme(MCS))テーブル(MCSインデックステーブル)
・チャネル品質指示(Channel Quality Indication(CQI))テーブル
・DCIフォーマット
・当該DCI(DCIフォーマット)に含まれる(付加される)巡回冗長検査(CRC:Cyclic Redundancy Check)ビットのスクランブル(マスク)に用いられる無線ネットワーク一時識別子(Radio Network Temporary Identifier(RNTI)、例えば、System Information(SI)-RNTI)
・RRC(Radio Resource Control)パラメータ
・特定のRNTI(例えば、URLLC用のRNTI、MCS-C-RNTI等)
・サーチスペース
・DCI内のフィールド(例えば、新たに追加されるフィールド又は既存のフィールドの再利用)
NRでは、1つ又は複数の送受信ポイント(Transmission/Reception Point(TRP))(マルチTRP)が、1つ又は複数のパネル(マルチパネル)を用いて、UEに対してDL送信を行うことが検討されている。また、UEが、1つ又は複数のTRPに対してUL送信を行うことが検討されている。
マルチTRPにまたがるPDSCH繰り返し(PDSCH repetitions)がサポートされることが検討されている。周波数ドメイン又はレイヤ(空間)ドメイン又は時間ドメイン上でマルチTRPにまたがる次の繰り返し方式(スキーム)の少なくとも1つがサポートされてもよい。
・周波数分割多重(frequency division multiplexing(FDM))される繰り返し:スキーム2a及び2b
・時間分割多重(time division multiplexing(TDM))される繰り返し:スキーム3及び4
このスキームは、単一スロット内において、n(n<=Ns(空間リソース数、レイヤ数、レイヤセット数))個のTCI状態を用い、オーバラップする時間及び周波数リソース配置(allocation)を用いてもよい。各送信オケージョンは、1つのレイヤ、又は同じトランスポートブロック(TB)のレイヤの1つのセット(レイヤセット)であってもよい。各レイヤ又はレイヤセットは、1つのTCI状態とDMRSポートの1つのセットとに関連付けられてもよい。1つの冗長バージョン(redundancy version(RV))を伴う単一コードワードは、全ての空間レイヤ又はレイヤセットにまたがって用いられてもよい。UEから見ると、異なる符号化ビットは、Rel.15と同じマッピングルールを用いて、異なるレイヤ又は異なるレイヤセットにマップされる。
このスキームは、単一スロット内において、n(n<=Nf(周波数リソース数))個のTCI状態を用い、非オーバラップ(non-overlapped)周波数リソース配置(allocation)を用いてもよい。それぞれの非オーバラップ周波数リソース配置は、1つのTCI状態に関連付けられてもよい。同じ単一又は複数のDMRSポートは、全ての非オーバラップ周波数リソース配置に関連付けられてもよい。
1つのRVを伴う単一コードワードは、リソース配置全体にまたがって用いられてもよい。UEから見ると、共通(common)リソースブロック(RB)マッピング(Rel.15と同様のコードワードからレイヤへのマッピング)は、リソース配置全体にまたがって適用されてもよい。
1つのRVを伴う単一コードワードは、それぞれの非オーバラップ周波数リソース配置に用いられてもよい。それぞれの非オーバラップ周波数リソース配置に対応するRVは、同じであってもよいし、異なってもよい。
周波数リソース配置は、マルチTRPの間において櫛(comb)状の周波数リソース配置であってもよい。ワイドバンドプリコーディングリソースブロックグループ(PRG)に対し、最初のceil(NRB/2)個のRBがTCI状態1に割り当てられ、残りのfloor (NRB/2)個のRBがTCI状態2に割り当てられてもよい。PRGサイズ=2又は4に対し、配置された周波数ドメインリソース配置(frequency domain resource allocation(FDRA))内の偶数インデックスのPRGはTCI状態1に割り当てられ、配置されたFDRA内の奇数インデックスのPRGはTCI状態2に割り当てられてもよい。
このスキームは、単一スロット内において、n(n<=Nt1(時間リソース数))個のTCI状態を用い、非オーバラップ(non-overlapped)時間リソース配置(allocation)を用いてもよい。TBの各送信オケージョンは、ミニスロットの時間粒度(granularity)を用いて、1つのTCI状態及び1つのRVを有していてもよい。スロット内の全ての送信オケージョンは、同じ単一又は複数のDMRSポートを有する共通のMCSを用いてもよい。RV及びTCI状態の少なくとも1つは、複数の送信オケージョンの間において同じであってもよいし、異なっていてもよい。
このスキームは、K(n<=K)個の異なるスロットにおいて、n(n<=Nt2(時間リソース数))個のTCI状態を用いてもよい。TBの各送信オケージョンは、1つのTCI状態及び1つのRVを有していてもよい。Kスロットにまたがる全ての送信オケージョンは、同じ単一又は複数のDMRSポートを有する共通のMCSを用いてもよい。RV及びTCI状態の少なくとも1つは、複数の送信オケージョンの間において同じであってもよいし、異なっていてもよい。
スケジュールされるPDSCHのサービングセルに対して設定されQCLタイプDを含む、少なくとも1つのTCI状態を用いる、シングルDCIベースのマルチTRP/パネル送信に対し、UE固有のPDSCH用のTCI状態のアクティベーションコマンドの受信の後、もしPDCCHの受信と、対応するPDSCHと、の間の時間オフセットが、閾値(timeDurationForQCL)よりも小さい場合、UEは、PDSCHのDMRSポートが、次のデフォルトTCI状態によって指示されるQCLパラメータに従うと想定してもよい。UEは、PDSCH用にアクティベートされる2つの異なるTCI状態を含むTCIコードポイントの中の最低コードポイントに対応するTCI状態を、デフォルトTCI状態に用いてもよい。もし全てのTCIコードポイントが単一のTCI状態にマップされている場合、デフォルトTCI状態は、Rel.15の動作に従ってもよい。シングルDCIに基づく複数PDSCHに対してデフォルトTCI状態を用いることは、UE能力の一部であってもよい。
UEは、マルチPDSCHをスケジュールするシングルDCIを受信してもよい。
この複数のTCI状態の決定方法では、2つのPDSCHと2つのTCI状態とのマッピングについて説明するが、2以上のNに対し、N個のPDSCHとN個のTCI状態のマッピングについても同様に適用可能である。
UEは、TCI状態IDの順序(昇順又は降順)に従って、1番目のTCI状態IDと2番目のTCI状態IDとを決定してもよい。
UEは、設定又はアクティベーションの少なくとも1つによって通知されたTCI状態IDの順序(位置、昇順または降順)に従って1番目のTCI状態IDと2番目のTCI状態IDとを決定してもよい。
シングルQCL適用条件が満たされる場合、UEは、全てのPDSCH(繰り返し)に対して1つのデフォルトQCLを想定してもよい(用いてもよい、決定してもよい)。
・CORESETの最低ID又は最高IDを有するTCI状態を用いてもよいし、最新スロット上のCORESETの最低ID又は最高IDを有するTCI状態
・1つのアクティブTCI状態に関連付けられたTCIコードポイントの中で最低コードポイントに関連付けられた1つのアクティブTCI状態
・アクティブTCI状態の中で最低IDを有するTCI状態
・マルチPDSCHをスケジュールするDCIのCORESETのTCI状態
・MAC CE又はRRC(新規パラメータ、新規フィールド)によって明示的に通知される1つのデフォルトQCL
・MAC CE又はRRC(新規パラメータ、新規フィールド)によって明示的に通知される2つのデフォルトQCLのうち、1番目のデフォルトQCL
・MAC CE又はRRC(新規パラメータ、新規フィールド)によって明示的に通知される2つのデフォルトQCLのうち、最低ID又は最高IDを有するTCI状態
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14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15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)
- 2つの物理下りリンク共有チャネル(PDSCH)のスケジューリングのための1つの下りリンク制御情報(DCI)を受信する受信部と、
もし送信設定指示(TCI)フィールドの特定コードポイントを前記2つのPDSCHの受信に用いる場合、前記特定コードポイントに関連付けられた2つのTCI状態IDを前記2つのPDSCHにそれぞれマップする制御部と、を有する端末。 - 前記特定コードポイントは、前記DCI及び前記2つのPDSCHの間の時間オフセットが閾値よりも短い場合、又は、TCIフィールドが設定されない場合の、PDSCH用の2つの異なるアクティブTCI状態に関連付けられたTCIフィールドのコードポイントの中の最低コードポイントと、前記DCI及び前記2つのPDSCHの間の時間オフセットが閾値以上である場合の、前記DCI内のTCIフィールドによって指示されるコードポイントと、のいずれかである、請求項1に記載の端末。
- 前記制御部は、前記2つのTCI状態IDの通知における前記2つのTCI状態IDの位置、又は前記2つのTCI状態IDの順序と、前記2つのPDSCHの順序と、に基づいて、前記2つのTCI状態IDを前記2つのPDSCHにそれぞれマップする、請求項1又は請求項2に記載の端末。
- 前記制御部は、前記2つのPDSCHのそれぞれのリソースと、前記2つのPDSCHのそれぞれに用いられるパラメータと、の少なくとも1つに基づいて、前記2つのPDSCHの順序を決定する、請求項3に記載の端末。
- 前記TCIフィールドの存在が設定されない場合、又は前記TCIフィールドの存在が設定され且つ前記TCIフィールドのいずれのコードポイントも2つのTCI状態IDに関連付けられていない場合、前記制御部は、1つのTCI状態を前記2つのPDSCHの受信に用いる、請求項1から請求項4のいずれかに記載の端末。
- 2つの物理下りリンク共有チャネル(PDSCH)のスケジューリングのための1つの下りリンク制御情報(DCI)を受信するステップと、
もし送信設定指示(TCI)フィールドの特定コードポイントを前記2つのPDSCHの受信に用いる場合、前記特定コードポイントに関連付けられた2つのTCI状態IDを前記2つのPDSCHにそれぞれマップするステップと、を有する、端末の無線通信方法。
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