WO2022102604A1 - 端末、無線通信方法及び基地局 - Google Patents
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- H—ELECTRICITY
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- H04L5/00—Arrangements affording multiple use of the transmission path
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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
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- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Definitions
- This disclosure relates to terminals, wireless communication methods and base stations in next-generation mobile communication systems.
- LTE Long Term Evolution
- UMTS Universal Mobile Telecommunications System
- 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), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel.15 or later, etc.
- 5G 5th generation mobile communication system
- 6G 6th generation mobile communication system
- NR New Radio
- one of the purposes of this disclosure is to provide a terminal, a wireless communication method, and a base station that appropriately determine PDCCH candidates.
- the terminal includes a control unit for determining a plurality of physical downlink control channel (PDCCH) candidates and a receiving unit for monitoring the plurality of PDCCH candidates, and the plurality of PDCCH candidates include the plurality of PDCCH candidates.
- PDCCH physical downlink control channel
- PDCCH candidates can be appropriately determined.
- FIG. 1 is a diagram showing an example of the maximum number of monitored PDCCH candidates per slot.
- FIG. 2 is a diagram showing an example of the maximum number of non-overlapping CCEs per slot.
- FIG. 3 is a diagram showing an example of the first embodiment.
- FIG. 4 is a diagram showing an example of Aspect 2-1.
- FIG. 5 is a diagram showing an example of Aspect 2-2.
- 6A and 6B are views showing an example of aspects 2-3.
- 7A and 7B are views showing an example of aspects 2-4.
- FIG. 8 is a diagram showing an example of aspect 3-1.
- FIG. 9 is a diagram showing an example of Aspect 3-2.
- FIG. 10 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.
- FIG. 10 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.
- FIG. 11 is a diagram showing an example of the configuration of the base station according to the embodiment.
- FIG. 12 is a diagram showing an example of the configuration of a user terminal according to an embodiment.
- FIG. 13 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.
- QCL Quality of Service
- the TCI state may be set in the UE per channel or per signal.
- 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): Doppler shift, Doppler spread, average delay and delay spread, -QCL type B (QCL-B): Doppler shift and Doppler spread, QCL type C (QCL-C): Doppler shift and average delay, -QCL type D (QCL-D): Spatial reception parameter.
- QCL-A Doppler shift, Doppler spread, average delay and delay spread
- -QCL type B QCL type B
- QCL type C QCL type C
- QCL-D Spatial reception parameter.
- the UE assumes that one control resource set (Control Resource Set (CORESET)) has a specific QCL (eg, QCL type D) relationship with another CORESET, channel or reference signal. It may be called a QCL assumption.
- CORESET Control Resource Set
- QCL QCL type D
- the UE may determine at least one of the transmit beam (Tx beam) and receive 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 for the channel (Reference Signal (RS))) 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 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 RS of the QCL type X in the TCI state may mean an RS having a relationship between a certain channel / signal (DMRS) and the QCL type X, and this RS is called the QCL source of the QCL type X in the TCI state. You may.
- DMRS channel / signal
- the QCL type A RS may always be set for the PDCCH and PDSCH, and the QCL type D RS may be additionally set. Since it is difficult to estimate Doppler shift, delay, etc. by receiving one shot of DMRS, QCL type A RS is used to improve the channel estimation accuracy.
- the QCL type D RS is used to determine the received beam when receiving a DMRS.
- TRS1-1, 1-2, 1-3, 1-4 are transmitted, and TRS1-1 is notified as QCL type C / D RS according to the TCI status of PDSCH.
- the UE can use the information obtained from the result of the past periodic reception / measurement of TRS1-1 for the reception / channel estimation of the DMRS for PDSCH.
- the QCL source of the PDSCH is TRS1-1
- the QCL target is the DMRS for PDSCH.
- Multi TRP In the NR, one or more transmission / reception points (Transmission / Reception Point (TRP)) (multi-TRP (multi TRP (MTRP))) are used for the UE by using one or more panels (multi-panel). It is being considered to perform DL transmission. Further, it is considered that the UE performs UL transmission to one or a plurality of TRPs by using one or a plurality of panels.
- TRP Transmission / Reception Point
- MTRP multi TRP
- UE performs UL transmission to one or a plurality of TRPs by using one or a plurality of panels.
- 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.
- the multi-TRP (for example, TRP # 1 and # 2) may be connected by an ideal / non-ideal backhaul, and information, data, etc. may be exchanged.
- Different code words Code Word (CW)
- CW Code Word
- Different layers may be transmitted from each TRP of the multi-TRP.
- NJT non-coherent joint transmission
- TRP # 1 modulation-maps the first codeword, layer-maps it, and transmits the first PDSCH to the first number of layers (eg, the second layer) using the first precoding.
- TRP # 2 modulation-maps the second codeword, layer-maps the second codeword, and transmits the second PDSCH to the second number of layers (for example, the second layer) 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, the first PDSCH from the first TRP and the second PDSCH from the second TRP may overlap at least one of the time and frequency resources.
- 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).
- Multiple PDSCHs from multiple TRPs may be scheduled using one DCI (single DCI, single PDCCH) (based on single master mode, single DCI).
- Multi TRP single-DCI based multi-TRP.
- Multiple PDSCHs from multiple TRPs may be scheduled using multiple DCIs (multi-DCI, multiple PDCCH (multiple PDCCH)) (multi-master mode, multi-DCI based multi-). TRP)).
- PDSCH transport block (TB) or codeword (CW) repetition (repetition) across multi-TRP.
- URLLC schemes URLLC schemes, eg, schemes 1, 2a, 2b, 3, 4
- SDM space division multiplexing
- FDM frequency division multiplexing
- RV redundant version
- the RV may be the same or different for the multi-TRP.
- the multi-PDSCH from the multi-TRP is time division multiplexing (TDM).
- TDM time division multiplexing
- the multi-PDSCH from the multi-TRP is transmitted within one slot.
- the multi-PDSCH from the multi-TRP is transmitted in different slots.
- one control resource set (CORESET) in the PDCCH setting information (PDCCH-Config) may correspond to one TRP.
- the UE may determine that it is a multi-TRP based on a multi-DCI.
- TRP may be read as a CORESET pool index.
- a CORESET pool index of 1 is set.
- Two different values of the CORESET pool index are set.
- the UE may determine that it is a multi-TRP based on a single DCI.
- the two TRPs may be read as the two TCI states indicated by MAC CE / DCI.
- [conditions] To indicate one or two TCI states for one code point in the TCI field in the DCI, "Enhanced TCI States Activation / Deactivation for UE- specific PDSCH MAC CE) ”is used.
- the DCI for common beam instruction may be a UE-specific DCI format (for example, DL DCI format (for example, 1_1, 1-2), UL DCI format (for example, 0_1, 0_2)), or may be common to UE-groups (UE-group). common) It may be in DCI format.
- Multi TRP PDCCH For the reliability of multi-TRP PDCCH based on non-single frequency network (SFN), the following are considered. • Coding / rate matching is based on one repetition, with the same coding bits being repeated in the other iterations. Each iteration has the same control channel element (CCE) number, the same coding bit, and corresponds to the same DCI payload. -Two or more PDCCH candidates are explicitly linked to each other. The UE knows the link before decryption.
- CCE control channel element
- Option 1-3 Two sets of PDCCH candidates are associated with each of the two SS sets. Both SS sets are associated with CORESET, and each SS set is associated with only one TCI state of that CORESET. Here, the same CORESET, two SS sets, are used.
- PDCCH candidate allocation Rel.
- NW common search space
- CCE control channel elements
- the network guarantees that overbooking based on the case where carrier aggregation (CA) is not performed (non-CA, non-CA) does not occur. ..
- CA carrier aggregation
- the UE per slot on the SCell. It is not assumed that the number of PDCCH candidates and the number of non-overlapping CCEs will be greater than the corresponding number per slot that the UE can monitor on the SCell.
- the UE is not supposed to monitor PDCCH in a USS set that does not have an allocated PDCCH for monitoring.
- PDCCH candidates for CSS are placed, and then PDCCH candidates for UE-specific search space (USS) are placed according to the ascending order of the search space set index (ID) (from the lowest index). ..
- CSS has a higher priority than USS.
- All PDCCH candidates for the USS set with the lower SS set ID are mapped before the PDCCH candidates for the USS set with the higher SS set ID. If not all PDCCH candidates in an SS set can be mapped, the PDCCH candidates in that SS set and the subsequent SS set will be dropped (not mapped). In the order of SS set ID, the SS set after a certain SS set may be referred to as a subsequent SS set.
- the UE is the maximum number of BDs and CCEs for multi-DCI-based multi-TRP transmission. The following principles may be supported for.
- the maximum number of monitored PDCCH candidates per slot in a DL BWP is Rel.
- the limit of 15 M PDCCH max, slot, ⁇ may not be exceeded, and the maximum number of non-overlapping CCEs is Rel.
- the limit of 15 C PDCCH max, slot, ⁇ may not be exceeded.
- the upper layer index may be set for each PDCCH setting information (PDCCH-Config) and each CORESET.
- the upper layer index may correspond to TRP.
- FIG. 1 shows Rel. At 15, the maximum number of monitored PDCCH candidates per slot M PDCCH max, slot, ⁇ for a DL BWP with an SCS setting ⁇ ⁇ ⁇ 0,1,2,3 ⁇ for operation with a single serving cell. show.
- FIG. 2 shows Rel. At 15, the maximum number of non-overlapping CCEs per slot C PDCCH max, slot, ⁇ for a DL BWP with an SCS setting ⁇ ⁇ ⁇ 0,1,2,3 ⁇ for operation with a single serving cell is shown. If the CCEs for PDCCH candidates correspond to different CORESET indexes, or different first symbols for receiving each PDCCH candidate, then those CCEs do not overlap.
- the UE is the scheduling cell.
- the N cells cap may be the value of the capacity information (pdcch-BlindDetectionCA) provided by the UE, or may be the set number of DL cells.
- the UE may show the ability to monitor PDCCH according to one or more combinations (X, Y).
- One span may be a continuous symbol configured for the UE to monitor the PDCCH within one slot.
- Each PDCCH monitoring occasion may be within one span. If the UE monitors the PDCCH on one cell according to the combination (X, Y), the UE will have a minimum time of X symbols between the first symbols of two consecutive spans, including straddles across multiple slots. Supports multiple PDCCH monitoring occasions within any symbol in one slot with separation.
- One span begins at the first symbol where a PDCCH monitoring occasion begins and ends at the last symbol where a PDCCH monitoring occasion ends, and the number of symbols in the span is up to Y.
- Maximum number of monitored PDCCH candidates in one span for a combination (X, Y) in a DL BWP with a subcarrier spacing (SCS) setting ⁇ ⁇ 0,1 ⁇ for a single serving cell M PDCCH max, (X) , Y), ⁇ may be specified in the specifications.
- Maximum number of non-overlapping CCEs in one span for a combination (X, Y) in a DL BWP with a subcarrier spacing (SCS) setting ⁇ ⁇ 0,1 ⁇ for a single serving cell C PDCCH max, (X, Y ) ), ⁇ may be specified in the specifications.
- Two PDCCH candidates (repetitions) with linkage may be decoded by the UE using soft combining.
- the following assumptions are being considered regarding how to count up to the BD / CCE limit.
- the UE decodes the first PDCCH candidate, and also decodes the combined candidate. In this case, if the first PDCCH candidate is blocked (due to PDCCH blocking or due to interference), the second decoding (in addition to the first decoding) is affected. Also, in this case, it is implied that the base station (gNB) cannot choose to transmit only the DCI in the second PDCCH candidate.
- the present inventors have conceived a method for counting / arranging PDCCH candidates.
- a / B / C and “at least one of A, B and C” may be read interchangeably.
- the cell, serving cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, and band may be read as each other.
- the index, the ID, the indicator, and the resource ID may be read as each other.
- support, control, controllable, working, working may be read interchangeably.
- configuration, activate, update, indicate, enable, specify, and select may be read as each other.
- link, associate, correspond, and map may be read as each other.
- “allocate”, “assign”, “monitor”, and “map” may be read as interchangeable with each other.
- 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
- RRC, RRC signaling, RRC parameters, higher layers, higher layer parameters, RRC information elements (IE), and RRC messages may be read interchangeably.
- 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
- MAC CE and activation / deactivation commands may be read interchangeably.
- Domain receive filter, UE spatial domain receive filter, UE receive beam, DL beam, DL receive beam, DL precoding, DL precoder, DL-RS, TCI state / QCL assumed QCL type D RS, TCI state / QCL assumed QCL type A RS, spatial relationship, spatial domain transmission filter, UE spatial domain transmission filter, UE transmission beam, UL beam, UL transmission beam, UL precoding, UL precoder, PL-RS may be read as each other.
- the QCL type X-RS, the DL-RS associated with the QCL type X, the DL-RS having the QCL type X, the source of the DL-RS, the SSB, the CSI-RS, and the SRS may be read as each other. good.
- a panel an Uplink (UL) transmission 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 Demo Division Multiplexing
- antenna port group of a certain signal for example, DMRS port group
- group for multiplexing for example, Code Division Multiplexing (CDM) group, reference signal group, CORESET group
- CORESET pool for example, CORESET subset
- CW redundant version (redundancy version (RV)
- layer 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.
- one of the two TCI states associated with one code point in the TRP, transmit point, panel, DMRS port group, CORESET pool, and TCI field may be read interchangeably.
- single TRP, single TRP system, single TRP transmission, and single PDSCH may be read as each other.
- multi-TRP, multi-TRP system, multi-TRP transmission, and multi-PDSCH may be read as each other.
- single DCI, single PDCCH, single DCI-based multi-TRP, and activation of two TCI states on at least one TCI code point may be read interchangeably.
- no CORESETPoolIndex value of 1 being set for any CORESET, and no code point in the TCI field being mapped to two TCI states may be read as mutually exclusive. ..
- a multi-TRP a channel using a multi-TRP, a channel using a plurality of TCI states / spatial relationships, a multi-TRP being enabled by RRC / DCI, and a plurality of TCI states / spatial relationships being enabled by RRC / DCI.
- At least one of a single DCI-based multi-TRP and a multi-DCI-based multi-TRP may be read interchangeably.
- the setting of a CORESETPoolIndex value of 1 for a multi-TRP and a CORESET based on a multi-DCI may be read as interchangeable with each other.
- the mapping of at least one code point of a single DCI-based multi-TRP, TCI field to two TCI states may be read interchangeably.
- DMRS Downlink Reference Signal
- DMRS port Downlink Reference Signal
- antenna port may be read as each other.
- the number of monitored PDCCH candidates and the number of blind detection (BD) may be read as each other.
- the number of non-overlapping CCEs, the number of CCEs for channel estimation, and the number of CCEs may be read as each other.
- slots, spans, continuous symbols, and time domain resources may be read interchangeably.
- the linkage between the two SS sets / PDCCH candidates may be specified in the specifications or may be set.
- Two PDCCH candidates with linkage may be counted as 1/2/4/4 (at least one of 1, 2, 3, 4). Multiple values from 1/2/4 may be supported. Support for this multiple values may depend on at least one of the settings and UE capabilities. For example, according to existing procedures, two PDCCH candidates with linkage count as two.
- This embodiment may be applied to the above-mentioned option 1-2 / option 2.
- CORESET1 and 2 are associated with the search space set (SSS1) to CORESET1.
- the PDCCH candidate in CORESET1 and the PDCCH candidate in CORESET2 have linkage. These two PDCCH candidates are counted as 1/2/3/4. According to this method, the maximum number of PDCCH candidates that can be monitored by the UE may be counted for one SS set.
- a plurality of PDCCH candidates in the same (one) slot / span and in the same (one) SS set can be appropriately counted / arranged.
- the procedure for counting up to the maximum number of PDCCH candidates that can be monitored by the UE for the set may follow any of the following aspects 2-1 to 2-4.
- the number of PDCCH candidates may be counted as 1.
- the number of PDCCH candidates may be counted as 1. In this case, the number of PDCCH candidates may be counted as 2 or 3 in view of the additional complexity of soft combining. Multiple values from 1/2/3 may be supported. Support for this multiple values may depend on at least one of the settings and UE capabilities.
- PDCCH candidates may be placed in the order of SS set ID from the lowest to the highest (ascending order) (similar to the existing procedure).
- the first PDCCH candidate is placed and the second PDCCH candidate is dropped (not placed).
- PDCCH candidate # 1 in SS set 0 and PDCCH candidate # 1 in SS set 2 have linkages, and PDCCH candidate # 2 in SS set 0, PDCCH candidate # 2 in SS set 2, and so on.
- PDCCH candidates # 1 and # 2 in SS set 0 are arranged in ascending order of SS set ID.
- the later linked PDCCH candidate / SS set (associated with the higher ID) has a higher priority. May be arranged using.
- the arrangement of PDCCH candidates may follow any of the following arrangement methods 1 and 2.
- Candidates # 1 to # 3 are set.
- PDCCH candidate # 1 in SS set 0 and PDCCH candidate # 1 in SS set 2 have linkages, and PDCCH candidate # 2 in SS set 0, PDCCH candidate # 2 in SS set 2, and so on.
- the PDCCH candidates in SS set 0 are placed, there is room to place the PDCCH candidates in SS set 2 by comparing the count of the placed PDCCH candidates with the maximum number (the number of remaining PDCCH candidates up to the maximum number). ), The PDCCH candidate is dropped (not placed).
- PDCCH candidates with linkage may be placed with higher priority.
- PDCCH candidates having linkage, then SS set ID in ascending order in the example of FIG. 5, SS set 0, PDCCH candidates # 1 and # 2 in SS set 2, SS set 1, PDCCH candidates # 1 and # 2 in SS set 2 and SS set 3 are arranged in this order. If the PDCCH candidates in SS set 0 are placed, there is room to place the PDCCH candidates in SS set 2 by comparing the count of the placed PDCCH candidates with the maximum number (the number of remaining PDCCH candidates up to the maximum number). ), The PDCCH candidate is dropped (not placed).
- PDCCH candidates may be placed in the order of SS set ID from lowest to highest (ascending order) (similar to the existing procedure).
- the first PDCCH candidate is placed and the second PDCCH candidate is dropped (not placed).
- ⁇ Aspect 2-3 Two SS sets with linkage are counted together and placed together. All PDCCH candidates in the two SS sets may be counted together and placed together. This embodiment is preferred when all PDCCH candidates in the two SS sets are set with linkage. This embodiment may be applied when all or some PDCCH candidates are set with linkage.
- the SS set linked to it When counting for an SS set with a lower ID, the SS set linked to it may be counted together. If one PDCCH candidate is linked to another PDCCH candidate, the number of PDCCH candidates placed may be counted as 1/2/3/4. Multiple values from 1/2/4 may be supported. Support for this multiple values may depend on at least one of the settings and UE capabilities. If all PDCCH candidates in the two SS sets can be placed, not all PDCCH candidates in both of the two SS sets need to be placed. If there are not enough PDCCH candidates for all PDCCH candidates in the two SS sets (room for PDCCH candidates, the maximum number of remaining PDCCH candidates), then all PDCCH candidates in both of the two SS sets. May not be placed (dropped).
- all two SS sets (within PDCCH candidates) having linkage may be arranged.
- PDCCH candidates # 1 and # 2 in SS set 0 and PDCCH candidates # 1 and # 2 in SS set 2 are set.
- PDCCH candidate # 1 in SS set 0 and PDCCH candidate # 1 in SS set 2 have linkages, and PDCCH candidate # 2 in SS set 0, PDCCH candidate # 2 in SS set 2, and so on.
- PDCCH candidate # 1 in SS set 0 is counted as 2.
- PDCCH candidate # 1 in SS set 2 linked to it is not counted.
- PDCCH candidate # 2 in SS set 0 is counted as 2.
- PDCCH candidate # 2 in SS set 2 linked to it is not counted. If the counts of PDCCH candidates # 1 and # 2 in SS set 0 and PDCCH candidates # 1 and # 2 in SS set 2 (if there is room) are less than or equal to the maximum number, all of these PDCCH candidates are placed. Will be done.
- all two SS sets with linkage may be dropped.
- the PDCCH candidate # 1 in the SS set 0 and the PDCCH candidate # 1 in the SS set 2 have a linkage
- the PDCCH candidate # 2 in the SS set 0 and the PDCCH candidate # 2 in the SS set 2 have a linkage.
- PDCCH candidate # 2 and has a linkage. If the counts of PDCCH candidates # 1 and # 2 in SS set 0 and PDCCH candidates # 1 and # 2 in SS set 2 exceed the maximum number (if there is no room), all of these PDCCH candidates will be dropped. (Not placed).
- Sufficient PDCCH candidates room for PDCCH candidates, remaining up to maximum for all PDCCH candidates in the first SS set and PDCCH candidates linked to that PDCCH candidate in the second SS set. If there is no PDCCH candidate), all PDCCH candidates in the first SS set and PDCCH candidates linked to the PDCCH candidate in the second SS set may not be placed (dropped). ..
- all two SS sets (within PDCCH candidates) having linkage may be arranged.
- PDCCH candidates # 1 to # 3 in SS set 0 and PDCCH candidates # 1 to # 3 in SS set 2 are set.
- PDCCH candidate # 1 in SS set 0 and PDCCH candidate # 1 in SS set 2 have linkages, and PDCCH candidate # 2 in SS set 0, PDCCH candidate # 2 in SS set 2, and so on.
- PDCCH candidate # 1 in SS set 0 is counted as 2 because it is arranged and has linkage.
- PDCCH candidate # 1 in SS set 0 is counted as 2.
- PDCCH candidate # 1 in SS set 2 linked to it is not counted.
- PDCCH candidate # 2 in SS set 0 has a linkage and is therefore counted as 2.
- PDCCH candidate # 2 in SS set 2 linked to it is not counted.
- PDCCH candidate # 3 in SS set 0 has no linkage and is therefore counted as 1.
- the count of PDCCH candidate # 3 in SS set 2 may follow the existing procedure. If the counts of PDCCH candidates # 1, # 2, # 3 in SS set 0 and PDCCH candidates # 1, # 2 in SS set 2 (if there is room) are less than or equal to the maximum number, all of these PDCCHs. Candidates are placed.
- all two SS sets with linkage may be dropped.
- the PDCCH candidate # 1 in the SS set 0 and the PDCCH candidate # 1 in the SS set 2 have a linkage
- the PDCCH candidate # 2 in the SS set 0 and the PDCCH candidate # 2 in the SS set 2 have a linkage.
- PDCCH candidate # 2 and has a linkage.
- the count of PDCCH candidate # 3 in SS set 2 may follow the existing procedure. If the count of PDCCH candidates # 1, # 2, # 3 in SS set 0 and PDCCH candidates # 1, # 2 in SS set 2 exceeds the maximum number (if there is no room), all of these PDCCH candidates Is dropped (not placed).
- a plurality of PDCCH candidates in the same (one) slot / span and in different (plural) SS sets can be appropriately counted / arranged.
- the procedure for counting up to the number may follow any of the following aspects 3-1 and 3-2.
- the number of PDCCH candidates may be counted as 1.
- the number of PDCCH candidates may be counted as 1. In this case, the number of PDCCH candidates may be counted as 2 or 3 in view of the additional complexity of soft combining. Multiple values from 1/2/3 may be supported. Support for this multiple values may depend on at least one of the settings and UE capabilities.
- PDCCH candidates may be placed in the order of SS set ID from the lowest to the highest (ascending order) (similar to the existing procedure).
- the first PDCCH candidate is placed and the second PDCCH candidate is dropped (not placed).
- the linkage between the two SS sets / PDCCH candidates may be specified in the specifications or may be set.
- Aspect 3-1 may be applied to the above-mentioned options 1-2 / 1-3 / 2/3.
- SS set 0 is set in slots # 1 and # 2
- SS set 1 is set in slot # 2.
- PDCCH candidates # 1 and # 2 are set in SS set 0 in slot # 1
- PDCCH candidates # 1, # 2, and # 3 are set in SS set 1 in slot # 2.
- the PDCCH candidate # 1 in SS set 0 in slot # 1 and the PDCCH candidate # 1 in SS set 1 in slot # 2 have a linkage
- the PDCCH candidate in SS set 0 in slot # 1 has a linkage.
- # 2 and PDCCH candidate # 2 in SS set 1 in slot # 2 have linkages.
- the PDCCH candidate of the first slot / span in one SS set is placed, and in the later slot / span, the PDCCH candidate / SS set linked to the PDCCH candidate is placed. It may be arranged with a higher priority.
- the arrangement of PDCCH candidates may follow any of the following arrangement methods 1 and 2.
- SS set 0 is set in slots # 1 and # 2
- SS set 1 and SS set 2 are set in slot # 2.
- PDCCH candidates # 1, # 2, and # 3 are set in SS set 0 in slot # 1
- PDCCH candidates # 1, # 2, and # 3 in SS set 1 in slot # 2 are set.
- the PDCCH candidate # 1 in SS set 0 in slot # 1 and the PDCCH candidate # 1 in SS set 1 in slot # 2 have a linkage
- the PDCCH candidate in SS set 0 in slot # 1 has a linkage.
- # 2 and PDCCH candidate # 2 in SS set 1 in slot # 2 have linkages.
- SS set 0 is arranged in slot # 0
- SS set 1 and SS are arranged in slot # 1.
- Set 0 and SS set 2 are arranged in this order. If there is no room for placing PDCCH candidates in SS set 1 in slot # 1 (the number of remaining PDCCH candidates up to the maximum number) by comparing the count of the placed PDCCH candidates with the maximum number, the PDCCH candidate is selected. Dropped (not placed).
- PDCCH candidates with linkage may be placed with higher priority.
- SS set 0 is arranged in slot # 0, and slot # In No. 1, PDCCH candidates # 1 and # 2 in SS set 1, SS set 0, and PDCCH candidates # 3 and SS set 2 in SS set 1 are arranged in this order. If there is no room for placing PDCCH candidates in SS set 1 in slot # 1 (the number of remaining PDCCH candidates up to the maximum number) by comparing the count of the placed PDCCH candidates with the maximum number, the PDCCH candidate is selected. Dropped (not placed).
- PDCCH candidates may be placed in the order of SS set ID from lowest to highest (ascending order) (similar to the existing procedure). PDCCH candidates may be placed in ascending order from lowest to highest linked SS set IDs in the previous slot / span. For example, if SS set 0 in slot # 1 is linked to SS set 1 in slot # 2 and SS set 1 in slot # 1 is linked to SS set 0 in slot # 2, in slot # 2. , The priority of SS set 1 may be higher than the priority of SS set 0.
- the first PDCCH candidate is placed and the second PDCCH candidate is dropped (not placed).
- a plurality of PDCCH candidates in different (plural) slots / spans can be appropriately counted / arranged.
- UE capability corresponding to at least one function (feature) in the first to third embodiments may be defined. If the UE reports this UE capability, the UE may perform the corresponding function. If the UE reports this UE capability and the upper layer parameters corresponding to this function are set, the UE may perform the corresponding function. Upper layer parameters (RRC information elements) corresponding to this function may be specified. If this higher layer parameter is set, the UE may perform the corresponding function.
- the UE capability may indicate whether the UE supports this feature.
- the UE capability may indicate whether the UE supports PDCCH iteration.
- the UE capability may indicate whether the UE supports PDCCH iterations with soft combining.
- the UE capability indicates the number of decryptions (eg, 1/2/3/4) counted for two PDCCH iterations using soft combining when the UE counts to the maximum number of PDCCH candidates. May be good.
- the UE can realize the above functions while maintaining compatibility with existing specifications.
- 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. 10 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 (Multi-RAT Dual Connectivity (MR-DC)) between a plurality of Radio Access Technologies (RATs).
- MR-DC is a dual connectivity (E-UTRA-NR Dual Connectivity (EN-DC)) between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR, and a dual connectivity (NR-E) between NR and LTE.
- E-UTRA-NR Dual Connectivity Evolved Universal Terrestrial Radio Access (E-UTRA)
- NR-E dual connectivity
- NE-DC -UTRA Dual Connectivity
- 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 macrocell C1 having a relatively wide coverage, and a base station 12 (12a-12c) that is arranged in the macrocell C1 and forms a small cell C2 that is narrower than the macrocell 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 a 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 macrocell 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 FR 2 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 compatible with 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.
- a downlink shared channel Physical Downlink Shared Channel (PDSCH)
- a broadcast channel Physical Broadcast Channel (PBCH)
- a downlink control channel Physical Downlink Control
- PDSCH Physical Downlink Control
- 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, or the like, and the DCI that schedules PUSCH may be called UL grant, UL DCI, or the like.
- the PDSCH may be read as DL data, and 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 for PDCCH detection.
- CORESET corresponds to a resource for searching 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 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" to 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. 11 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.
- the functional block of the characteristic portion in the present embodiment is mainly shown, 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 the common recognition in the technical field according to the present disclosure. be able to.
- the transmission / reception unit 120 may be configured as an integrated transmission / reception unit, or may be 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 the 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 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. Processing (if necessary), inverse Fast Fourier Transform (IFFT) processing, precoding, transmission processing such as digital-analog transformation may be performed, and the baseband signal may be output.
- channel coding may include error correction coding
- modulation modulation
- mapping mapping, filtering
- DFT discrete Fourier Transform
- IFFT inverse Fast Fourier Transform
- precoding coding
- transmission processing such as digital-analog transformation
- 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) for 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, etc., and user data (user plane data) for the user terminal 20 and a control plane. 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 control unit 110 may determine a plurality of physical downlink control channel (PDCCH) candidates.
- the transmission / reception unit 120 may transmit the PDCCH in at least one of the plurality of PDCCH candidates.
- the plurality of PDCCH candidates may be associated with a plurality of values of parameters indicating at least one of a control resource set, a search space set, and a slot and a span.
- the plurality of PDCCH candidates may be linked.
- FIG. 12 is a diagram showing an example of the configuration of a user terminal according to an 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.
- the functional block of the feature portion in the present embodiment is mainly shown, 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, 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 the 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 processes, for example, 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.
- 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 a 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 transmission unit and the reception unit of the user terminal 20 in the present disclosure may be composed of at least one of the transmission / reception unit 220, the transmission / reception antenna 230, and the transmission line interface 240.
- the control unit 210 may determine a plurality of physical downlink control channel (PDCCH) candidates.
- the transmission / reception unit 220 may monitor the plurality of PDCCH candidates.
- the plurality of PDCCH candidates may be associated with a plurality of values of parameters indicating at least one of a control resource set, a search space set, and a slot and a span.
- the plurality of PDCCH candidates may be linked.
- the plurality of PDCCH candidates may be in the same slot or the same span, and may be in the same search space set (first embodiment).
- the plurality of PDCCH candidates are in the same slot or the same span, and may be in different search space sets (second embodiment).
- the plurality of PDCCH candidates may be in different slots or different spans (third embodiment).
- each functional block is realized using one physically or logically coupled device, or two or more physically or logically separated devices can be directly or indirectly (eg, for example). , 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 (configuration unit) for functioning transmission may be referred to as a transmitting unit (transmitting unit), a transmitter (transmitter), or the like.
- the realization method is not particularly limited.
- the base station, user terminal, and the like in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure.
- FIG. 13 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 in 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
- the 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 a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), or any other suitable storage medium. 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 disk, a floppy disk (registered trademark) disk, an optical magnetic disk (for example, a compact disc (Compact Disc ROM (CD-ROM), etc.), a digital versatile disk, etc.). At least one of Blu-ray® discs, removable discs, optical disc drives, smart cards, flash memory devices (eg cards, sticks, key drives), magnetic stripes, databases, servers, and other suitable storage media. May be configured by.
- 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 has, 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 by 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 accepts 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 CC may be referred to as a cell, a frequency carrier, a carrier frequency, or the like.
- the wireless frame may be configured by one or more periods (frames) in the time domain.
- Each of the one or more periods (frames) constituting the radio 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 does not depend on 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 area (Orthogonal Frequency Division Multiplexing (OFDM) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.). Further, the slot may be a time unit based on numerology.
- OFDM Orthogonal Frequency Division Multiplexing
- SC-FDMA Single Carrier Frequency Division Multiple Access
- the slot may include a plurality of mini slots.
- Each minislot may be composed of one or more symbols in the time domain. Further, the mini-slot may be referred to as a sub-slot.
- a minislot may consist of a smaller number of symbols than the slot.
- the PDSCH (or PUSCH) transmitted in time units larger than the minislot may be referred to as 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 use different names corresponding to each.
- the time units such as frames, subframes, slots, minislots, 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. 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.
- 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.
- a TTI shorter than a normal TTI may be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a minislot, a subslot, a slot, or the like.
- the long TTI (eg, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms
- the short TTI eg, shortened TTI, etc.
- TTI having the above TTI length may be read as 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.
- PRB Physical RB
- SCG sub-carrier Group
- REG resource element group
- PRB pair an RB. It may be called a pair or the like.
- 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) 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, minislots and symbols are merely examples.
- the number of subframes contained in a radio frame the number of slots per subframe or radio frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, 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 an absolute value, a relative value from a predetermined value, or another corresponding information. It may be represented.
- the radio resource 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 embodiment / 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 referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.
- MAC signaling may be notified using, for example, a MAC control element (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, instructions, information, etc. may be transmitted and received via a transmission medium.
- the software uses at least one of wired technology (coaxial cable, fiber optic cable, twist pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.) on the website.
- wired technology coaxial cable, fiber optic cable, twist 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
- wireless base station fixed station
- NodeB NodeB
- eNB eNodeB
- gNB gNodeB
- Access point "Transmission point (Transmission Point (TP))
- Reception point 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 (eg, 3) cells.
- a base station accommodates multiple cells, the entire base station coverage area 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 Remote Radio Head
- the term "cell” or “sector” refers to a portion or all of the coverage area of at least one of a base station and a base station subsystem that provides 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, a mobile body itself, or the like.
- the moving body may be a vehicle (eg, car, airplane, etc.), an unmanned moving body (eg, drone, self-driving car, etc.), or a robot (manned or unmanned). ) 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.
- communication between a base station and a user terminal has been replaced with communication between a plurality of user terminals (for example, it may be referred to as 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 communication between terminals (for example, "side”).
- the upstream channel, the downstream 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 a base station, 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 may be switched and used according to the 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
- 6G 6th generation mobile communication system
- xG xG (xG (x is, for example, an integer or a fraction)
- Future Radio Access FAA
- RAT New -Radio Access Technology
- NR New Radio
- NX New radio access
- FX Future generation radio access
- GSM registered trademark
- CDMA2000 Code Division Multiple Access
- UMB Ultra Mobile Broadband
- UMB Ultra Mobile Broadband
- LTE 802.11 Wi-Fi®
- LTE 802.16 WiMAX®
- LTE 802.20 Ultra-WideBand (UWB), Bluetooth®, and other suitable radios.
- UMB Ultra Mobile Broadband
- references to elements using designations such as “first” and “second” 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 “determining” 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.
- the "maximum transmission power" described in the present disclosure may mean the maximum value of the transmission power, may mean the nominal UE maximum transmit power, or may mean the rated maximum transmission power (the). It may mean rated UE maximum transmit power).
- connection are any direct or indirect connections or connections between two or more elements. Means, and can include the presence of one or more intermediate elements between two elements that are “connected” or “bonded” 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 region when two elements are connected, one or more wires, cables, printed electrical connections, etc. are used, and as some non-limiting and non-comprehensive examples, the radio frequency region, microwaves. It can be considered to be “connected” or “coupled” to each other using electromagnetic energy having wavelengths in the region, 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。
NRでは、1つ又は複数の送受信ポイント(Transmission/Reception Point(TRP))(マルチTRP(multi TRP(MTRP)))が、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、1つ又は複数のパネルを用いて、UL送信を行うことが検討されている。
[条件1]
1のCORESETプールインデックスが設定される。
[条件2]
CORESETプールインデックスの2つの異なる値(例えば、0及び1)が設定される。
[条件]
DCI内のTCIフィールドの1つのコードポイントに対する1つ又は2つのTCI状態を指示するために、「UE固有PDSCH用拡張TCI状態アクティベーション/ディアクティベーションMAC CE(Enhanced TCI States Activation/Deactivation for UE-specific PDSCH MAC CE)」が用いられる。
非single frequency network(SFN)に基づくマルチTRP PDCCHの信頼性のために、以下のことが検討されている。
・符号化/レートマッチングが1つの繰り返し(repetition)に基づき、他の繰り返しにおいて同じ符号化ビットが繰り返される。
・各繰り返しは、同じcontrol channel element(CCE)数と、同じ符号化ビットと、を有し、同じDCIペイロードに対応する。
・2つ以上のPDCCH候補が明示的に互いにリンクされる。UEが復号前にそのリンクを知る。
(与えられたサーチスペース(SS)セット内の)PDCCH候補の2つのセットがCORESETの2つのTCI状態にそれぞれ関連付けられる。ここでは、同じCORESET、同じSSセット、異なるモニタリングオケージョンにおけるPDCCH繰り返し、が用いられる。
PDCCH候補の2つのセットが2つのSSセットにそれぞれ関連付けられる。両方のSSセットはCORESETに関連付けられ、各SSセットはそのCORESETの1つのみのTCI状態に関連付けられる。ここでは、同じCORESET、2つのSSセット、が用いられる。
1つのSSセットが2つの異なるCORESETに関連付けられる。
2つのSSセットが2つのCORESETにそれぞれ関連付けられる。
Rel.15 NRにおいて、共通サーチスペース(common search space(CSS))に対し、ネットワーク(NW)は、オーバーブッキング(overbooking、過剰な配置)が発生しないことを保証する。UEは、スロット当たりのモニタされるPDCCH候補(candidates)と非重複(non-overlapped)制御チャネル要素(control channel element(CCE))とについて、対応する総数又はスケジュールドセル当たりの数が、スロット当たりの対応する最大数を超えることを招くCCSセットを設定されることを想定しない。
BD制限において、REデマッピング/復調に関連する複雑性に関し、2つのユニットが必要である。
BD制限において、復号に関連する複雑性に関し、1つ以上のユニットが必要である。UEは、個々のPDCCH候補を復号することなく、コンバインされた候補を復号するのみである。「以上」とする理由は、ソフトコンバイニングが、格納に関連する追加の複雑性を有するためである。この場合、妨害(blockage)は性能に影響を与える可能性がある(分離された復号ではない)。また、この場合、基地局(gNB)は、両方のPDCCH候補を常に送信する必要がある(即ち、基地局は1つのみを選ぶことができない)ことが暗示される。
BD制限において、復号に関連する複雑性に関し、2つのユニットが必要である。UEは、個々のPDCCH候補を復号する。BDに対してソフトコンバイニングは考慮されない。
BD制限において、復号に関連する複雑性に関し、2つ以上のユニットが必要である。UEは、第1のPDCCH候補を復号し、コンバインされた候補も復号する。この場合、もし(PDCCHブロッキングに起因して、又は妨害に起因して)第1のPDCCH候補がブロックされた場合、(第1の復号に加えて)第2の復号に影響がある。また、この場合、基地局(gNB)は、第2のPDCCH候補内のDCIのみを送信することの選択ができないことが暗示される。
BD制限において、復号に関連する複雑性に関し、3つのユニットが必要である。UEは、各PDCCH候補を個別に復号し、コンバインされた候補も復号する。
スロット/スパン毎にPDCCH候補の配置が行われることを考慮し、以下の想定1及び2のいずれかが想定されてもよい。
繰り返しのための複数のPDCCH候補は、同じ(1つの)スロット/スパン内にある。
複数のPDCCH候補は、同じ(1つの)SSセット内にある。
複数のPDCCH候補は、異なる(複数の)SSセット内にある。
繰り返しのための複数のPDCCH候補は、異なる(複数の)スロット/スパン内にある。
想定1-1(複数のPDCCH候補は、同じ(1つの)スロット/スパン内にあり、その複数のPDCCH候補は、同じ(1つの)SSセット内にあるケース)において、1つのSSセットに対し、UEがモニタできるPDCCH候補の最大数までカウントする手順(PDCCH候補の配置の手順)は、以下に従ってもよい。
想定1-2(複数のPDCCH候補は、同じ(1つの)スロット/スパン内にあり、その複数のPDCCH候補は、異なる(複数の)SSセット内にあるケース)において、リンケージを有する2つのSSセットに対し、UEがモニタできるPDCCH候補の最大数までカウントする手順(PDCCH候補の配置の手順)は、以下の態様2-1から2-4のいずれかに従ってもよい。
2つのSSセット内の2つのPDCCH候補は、独立にカウントされ、独立に配置される(既存の手順と同様)。
2つのSSセット内の2つのPDCCH候補は、独立にカウントされ、独立に配置される。PDCCH候補配置の手順において、リンクされたSSセット/PDCCH候補の優先度が高められる。
リンクされたSSセット内の全てのPDCCH候補が、より高い優先度を用いて配置されてもよい。
リンケージを有するPDCCH候補(のみ)が、より高い優先度を用いて配置されてもよい。例えば、配置方法2(リンケージを有するPDCCH候補、次にSSセットIDの昇順)に従うと、図5の例において、SSセット0、SSセット2内のPDCCH候補#1及び#2、SSセット1、SSセット2内のPDCCH候補#1及び#2、SSセット3、の順に配置される。もしSSセット0内のPDCCH候補が配置された後、配置されるPDCCH候補のカウントと最大数との比較によって、SSセット2内のPDCCH候補を配置する余地(最大数までの残りのPDCCH候補数)がない場合、そのPDCCH候補はドロップされる(配置されない)。
リンケージを有する2つのSSセットは、共に(together、合わせて)カウントされ、共に配置される。2つのSSセット内の全てのPDCCH候補は、共にカウントされ、共に配置されてもよい。この態様は、2つのSSセット内の全てのPDCCH候補がリンケージを有して設定される場合に好ましい。この態様は、全て又は幾つかのPDCCH候補がリンケージを有して設定される場合に適用されてもよい。
リンケージを有する2つのPDCCH候補は、共にカウントされ、共に配置される。2つのSSセット内のリンケージを有するPDCCH候補のみが、共にカウントされ、共に配置されてもよい。この態様は、2つのSSセット内の幾つか(一部)のPDCCH候補がリンケージを有して設定され、2つのSSセット内の他のPDCCH候補がリンケージなく設定される場合に好ましい。
想定2(複数のPDCCH候補は、異なる(複数の)スロット/スパン内にあるケース)において、リンケージを有するSSセット/PDCCH候補を有する2つのスロット/スパンに対し、UEがモニタできるPDCCH候補の最大数までカウントする手順(PDCCH候補の配置の手順)は、以下の態様3-1及び3-2のいずれかに従ってもよい。
2つのスロット/スパン内の2つのPDCCH候補は、独立にカウントされる(既存の手順と同様)。
2つのスロット/スパン内の2つのPDCCH候補は、独立にカウントされ、独立に配置される。PDCCH候補配置の手順において、リンクされたSSセット/PDCCH候補の優先度が高められる。
リンクされたSSセット内の全てのPDCCH候補が、より高い優先度を用いて配置されてもよい。
リンケージを有するPDCCH候補(のみ)が、より高い優先度を用いて配置されてもよい。例えば、配置方法2(スロット/スパンの昇順、次にリンケージを有するPDCCH候補、次にSSセットIDの昇順)に従うと、図9の例において、スロット#0においてSSセット0が配置され、スロット#1において、SSセット1内のPDCCH候補#1及び#2、SSセット0、SSセット1内のPDCCH候補#3、SSセット2、の順に配置される。配置されるPDCCH候補のカウントと最大数との比較によって、スロット#1内のSSセット1内のPDCCH候補を配置する余地(最大数までの残りのPDCCH候補数)がない場合、そのPDCCH候補はドロップされる(配置されない)。
第1から第3の実施形態における少なくとも1つの機能(特徴、feature)に対応するUE能力(capability)が規定されてもよい。UEがこのUE能力を報告した場合、UEは、対応する機能を行ってもよい。UEがこのUE能力を報告し、且つこの機能に対応する上位レイヤパラメータを設定された場合、UEは、対応する機能を行ってもよい。この機能に対応する上位レイヤパラメータ(RRC情報要素)が規定されてもよい。この上位レイヤパラメータが設定された場合、UEは、対応する機能を行ってもよい。
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11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12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)
- 複数の物理下りリンク制御チャネル(PDCCH)候補を決定する制御部と、
前記複数のPDCCH候補をモニタする受信部と、を有し、
前記複数のPDCCH候補は、コントロールリソースセットとサーチスペースセットとスロットとスパンとの少なくとも1つを示すパラメータの複数の値にそれぞれ関連付けられ、
前記複数のPDCCH候補はリンクされる、端末。 - 前記複数のPDCCH候補は、同じスロット又は同じスパン内にあり、同じサーチスペースセット内にある、請求項1に記載の端末。
- 前記複数のPDCCH候補は、同じスロット又は同じスパン内にあり、異なるサーチスペースセット内にある、請求項1に記載の端末。
- 前記複数のPDCCH候補は、異なるスロット又は異なるスパン内にある、請求項1に記載の端末。
- 複数の物理下りリンク制御チャネル(PDCCH)候補を決定するステップと、
前記複数のPDCCH候補をモニタするステップと、を有し、
前記複数のPDCCH候補は、コントロールリソースセットとサーチスペースセットとスロットとスパンとの少なくとも1つを示すパラメータの複数の値にそれぞれ関連付けられ、
前記複数のPDCCH候補はリンクされる、端末の無線通信方法。 - 複数の物理下りリンク制御チャネル(PDCCH)候補を決定する制御部と、
前記複数のPDCCH候補の少なくとも1つにおいてPDCCHを送信する送信部と、を有し、
前記複数のPDCCH候補は、コントロールリソースセットとサーチスペースセットとスロットとスパンとの少なくとも1つを示すパラメータの複数の値にそれぞれ関連付けられ、
前記複数のPDCCH候補はリンクされる、基地局。
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LENOVO, MOTOROLA MOBILITY: "Enhancements on Multi-TRP for PDCCH, PUCCH and PUSCH", 3GPP DRAFT; R1-2008911, vol. RAN WG1, 24 October 2020 (2020-10-24), pages 1 - 15, XP051946723 * |
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